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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2307.02546
|
Martin Hoferichter
|
Martin Hoferichter, Bai-Long Hoid, Bastian Kubis, Dominic Schuh
|
Isospin-breaking effects in the three-pion contribution to hadronic
vacuum polarization
|
29 pages, 4 figures, result for $\bar \eta_{3\pi}$ included as
supplementary material; journal version
|
JHEP 08 (2023) 208
|
10.1007/JHEP08(2023)208
|
INT-PUB-23-021
|
hep-ph hep-ex hep-lat nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Isospin-breaking (IB) effects are required for an evaluation of hadronic
vacuum polarization at subpercent precision. While the dominant contributions
arise from the $e^+e^-\to\pi^+\pi^-$ channel, also IB in the subleading
channels can become relevant for a detailed understanding, e.g., of the
comparison to lattice QCD. Here, we provide such an analysis for $e^+e^-\to
3\pi$ by extending our dispersive description of the process, including
estimates of final-state radiation (FSR) and $\rho$-$\omega$ mixing. In
particular, we develop a formalism to capture the leading infrared-enhanced
effects in terms of a correction factor $\eta_{3\pi}$ that generalizes the
analog treatment of virtual and final-state photons in the $2\pi$ case. The
global fit to the $e^+e^-\to 3\pi$ data base, subject to constraints from
analyticity, unitarity, and the chiral anomaly, gives $a_\mu^{3\pi}|_{\leq
1.8\,\text{GeV}}=45.91(53)\times 10^{-10}$ for the total $3\pi$ contribution to
the anomalous magnetic moment of the muon, of which
$a_\mu^\text{FSR}[3\pi]=0.51(1)\times 10^{-10}$ and
$a_\mu^{\rho\text{-}\omega}[3\pi]=-2.68(70)\times 10^{-10}$ can be ascribed to
IB. We argue that the resulting cancellation with $\rho$-$\omega$ mixing in
$e^+e^-\to 2\pi$ can be understood from a narrow-resonance picture, and provide
updated values for the vacuum-polarization-subtracted vector-meson parameters
$M_\omega=782.70(3)\,\text{MeV}$, $M_\phi=1019.21(2)\,\text{MeV}$,
$\Gamma_\omega=8.71(3)\,\text{MeV}$, and $\Gamma_\phi=4.27(1)\,\text{MeV}$.
|
[
{
"created": "Wed, 5 Jul 2023 18:00:03 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Aug 2023 11:23:32 GMT",
"version": "v2"
}
] |
2023-08-31
|
[
[
"Hoferichter",
"Martin",
""
],
[
"Hoid",
"Bai-Long",
""
],
[
"Kubis",
"Bastian",
""
],
[
"Schuh",
"Dominic",
""
]
] |
Isospin-breaking (IB) effects are required for an evaluation of hadronic vacuum polarization at subpercent precision. While the dominant contributions arise from the $e^+e^-\to\pi^+\pi^-$ channel, also IB in the subleading channels can become relevant for a detailed understanding, e.g., of the comparison to lattice QCD. Here, we provide such an analysis for $e^+e^-\to 3\pi$ by extending our dispersive description of the process, including estimates of final-state radiation (FSR) and $\rho$-$\omega$ mixing. In particular, we develop a formalism to capture the leading infrared-enhanced effects in terms of a correction factor $\eta_{3\pi}$ that generalizes the analog treatment of virtual and final-state photons in the $2\pi$ case. The global fit to the $e^+e^-\to 3\pi$ data base, subject to constraints from analyticity, unitarity, and the chiral anomaly, gives $a_\mu^{3\pi}|_{\leq 1.8\,\text{GeV}}=45.91(53)\times 10^{-10}$ for the total $3\pi$ contribution to the anomalous magnetic moment of the muon, of which $a_\mu^\text{FSR}[3\pi]=0.51(1)\times 10^{-10}$ and $a_\mu^{\rho\text{-}\omega}[3\pi]=-2.68(70)\times 10^{-10}$ can be ascribed to IB. We argue that the resulting cancellation with $\rho$-$\omega$ mixing in $e^+e^-\to 2\pi$ can be understood from a narrow-resonance picture, and provide updated values for the vacuum-polarization-subtracted vector-meson parameters $M_\omega=782.70(3)\,\text{MeV}$, $M_\phi=1019.21(2)\,\text{MeV}$, $\Gamma_\omega=8.71(3)\,\text{MeV}$, and $\Gamma_\phi=4.27(1)\,\text{MeV}$.
|
1304.0080
|
Jorge Portoles
|
A. Filipuzzi, J. Portoles and P. Ruiz-Femenia (IFIC, CSIC - U.
Valencia)
|
Zeros of the $W_L Z_L \rightarrow W_L Z_L$ amplitude: With or without a
light Higgs
|
Talk at the 7th International Workshop on Chiral Dynamics, August
6-10, 2012, Thomas Jefferson National Accelerator Facility, 7 pages, 2
figures
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The existence of a new strong interacting sector around E ~ 1 TeV is a common
feature of Higgsless electroweak theories but also of theories with a light
Higgs, for instance, when this is not elementary. In those schemes, this new
interaction could be at the origin of an extended spectra with, in particular,
spin-1 resonances that could be hinted in elastic gauge boson scattering.
Information on those resonances, if they exist, must be contained in the
low-energy couplings of the electroweak chiral effective theory. Using the
facts that: i) the scattering of longitudinal gauge bosons, W_L, Z_L, can be
well described in the high-energy region (E >> M_W) by the scattering of the
corresponding Goldstone bosons (equivalence theorem) and that ii) the zeros of
the scattering amplitude carry the information on the heavier spectrum that has
been integrated out; we employ the O(p^4) electroweak chiral Lagrangian, with
or without a light Higgs state to identify the parameter space region of the
low-energy couplings where vector resonances may arise.
|
[
{
"created": "Sat, 30 Mar 2013 09:49:17 GMT",
"version": "v1"
}
] |
2013-04-02
|
[
[
"Filipuzzi",
"A.",
"",
"IFIC, CSIC - U.\n Valencia"
],
[
"Portoles",
"J.",
"",
"IFIC, CSIC - U.\n Valencia"
],
[
"Ruiz-Femenia",
"P.",
"",
"IFIC, CSIC - U.\n Valencia"
]
] |
The existence of a new strong interacting sector around E ~ 1 TeV is a common feature of Higgsless electroweak theories but also of theories with a light Higgs, for instance, when this is not elementary. In those schemes, this new interaction could be at the origin of an extended spectra with, in particular, spin-1 resonances that could be hinted in elastic gauge boson scattering. Information on those resonances, if they exist, must be contained in the low-energy couplings of the electroweak chiral effective theory. Using the facts that: i) the scattering of longitudinal gauge bosons, W_L, Z_L, can be well described in the high-energy region (E >> M_W) by the scattering of the corresponding Goldstone bosons (equivalence theorem) and that ii) the zeros of the scattering amplitude carry the information on the heavier spectrum that has been integrated out; we employ the O(p^4) electroweak chiral Lagrangian, with or without a light Higgs state to identify the parameter space region of the low-energy couplings where vector resonances may arise.
|
2203.02520
|
Yoxara S\'anchez Villamizar
|
A. Alves, L. Duarte, S. Kovalenko, Y. M. Oviedo-Torres, F. S. Queiroz,
Y. S. Villamizar
|
Constraining 3-3-1 Models at the LHC and Future Hadron Colliders
|
9 pages, 6 figures, 4 tables
| null |
10.1103/PhysRevD.106.055027
| null |
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
In this work, we derive lower mass bounds on the Z' gauge boson based on the
dilepton data from LHC with 13 TeV of center-of-mass energy, and forecast the
sensitivity of the High-Luminosity-LHC with $L=3000 fb^{-1}$, the High-Energy
LHC with $\sqrt{s}=27$ TeV, and also at the Future Circular Collider with
$\sqrt{s}=100$ TeV. We take into account the presence of exotic and invisible
decays of the Z' gauge boson to find a more conservative and robust limit,
different from previous studies. We investigate the impact of these new decays
channels for several benchmark models in the scope of two different 3-3-1
models. We found that in the most constraining cases, LHC with $139fb^{-1}$ can
impose $m_{Z^{\prime}}>4$ TeV. Moreover, we forecast HL-LHC, HE-LHC, and FCC
bounds that yield $m_{Z^{\prime}}>5.8$ TeV, $m_{Z^{\prime}}>9.9$ TeV, and
$m_{Z^{\prime}}> 27$ TeV, respectively. Lastly, put our findings into
perspective with dark matter searches to show the region of parameter space
where a dark matter candidate with the right relic density is possible.
|
[
{
"created": "Fri, 4 Mar 2022 19:00:25 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Aug 2022 13:52:21 GMT",
"version": "v2"
}
] |
2022-10-05
|
[
[
"Alves",
"A.",
""
],
[
"Duarte",
"L.",
""
],
[
"Kovalenko",
"S.",
""
],
[
"Oviedo-Torres",
"Y. M.",
""
],
[
"Queiroz",
"F. S.",
""
],
[
"Villamizar",
"Y. S.",
""
]
] |
In this work, we derive lower mass bounds on the Z' gauge boson based on the dilepton data from LHC with 13 TeV of center-of-mass energy, and forecast the sensitivity of the High-Luminosity-LHC with $L=3000 fb^{-1}$, the High-Energy LHC with $\sqrt{s}=27$ TeV, and also at the Future Circular Collider with $\sqrt{s}=100$ TeV. We take into account the presence of exotic and invisible decays of the Z' gauge boson to find a more conservative and robust limit, different from previous studies. We investigate the impact of these new decays channels for several benchmark models in the scope of two different 3-3-1 models. We found that in the most constraining cases, LHC with $139fb^{-1}$ can impose $m_{Z^{\prime}}>4$ TeV. Moreover, we forecast HL-LHC, HE-LHC, and FCC bounds that yield $m_{Z^{\prime}}>5.8$ TeV, $m_{Z^{\prime}}>9.9$ TeV, and $m_{Z^{\prime}}> 27$ TeV, respectively. Lastly, put our findings into perspective with dark matter searches to show the region of parameter space where a dark matter candidate with the right relic density is possible.
|
hep-ph/0103267
|
Zuo-tang Liang
|
Qing-hua Xu, Chun-xiu Liu and Zuo-tang Liang
|
Spin alignment of vector meson in e+e- annihilation at Z0 pole
|
15 pages, 2 fgiures; submitted to Phys. Rev. D
|
Phys.Rev.D63:111301,2001
|
10.1103/PhysRevD.63.111301
| null |
hep-ph
| null |
We calculate the spin density matrix of the vector meson produced in e+e-
annihilation at Z^0 pole. We show that the data imply a significant
polarization for the antiquark which is created in the fragmentation process of
the polarized initial quark and combines with the fragmenting quark to form the
vector meson. The direction of polarization is opposite to that of the
fragmenting quark and the magnitude is of the order of 0.5. A qualitative
explanation of this result based on the LUND string fragmentation model is
given.
|
[
{
"created": "Sun, 25 Mar 2001 09:28:59 GMT",
"version": "v1"
}
] |
2009-12-31
|
[
[
"Xu",
"Qing-hua",
""
],
[
"Liu",
"Chun-xiu",
""
],
[
"Liang",
"Zuo-tang",
""
]
] |
We calculate the spin density matrix of the vector meson produced in e+e- annihilation at Z^0 pole. We show that the data imply a significant polarization for the antiquark which is created in the fragmentation process of the polarized initial quark and combines with the fragmenting quark to form the vector meson. The direction of polarization is opposite to that of the fragmenting quark and the magnitude is of the order of 0.5. A qualitative explanation of this result based on the LUND string fragmentation model is given.
|
1011.5363
|
Andr\'as Ag\'ocs
|
A. G. Ag\'ocs, G. G. Barnaf\"oldi, P. L\'evai
|
Jets and Underlying Events at LHC Energies
|
4 pages, 2 figures, Proceedings of Hot Quarks 2010, 21-26 June 2010
Las Londe Les Maures; to appear in Journal of Physics: Conference Series
|
J.Phys.Conf.Ser.270:012017,2011
|
10.1088/1742-6596/270/1/012017
| null |
hep-ph
|
http://creativecommons.org/licenses/by-nc-sa/3.0/
|
Jet-matter interaction remains a central question and a theoretical challenge
in heavy-ion physics and might become important in high-multiplicity events in
proton-proton collisions at LHC energies. Full jet measurement at LHC offer the
proper tool to investigate energy loss process and fragmentation of hard parton
in the medium. Since jet reconstruction will be constrained to small cone
sizes, then study of the connection between jets and surrounding environment
provides a further possibility to extend our exploration. We study jets at s =
(14 TeV)^2 and pp collisions at s = (7 TeV)^2. We analyze the flavor components
in jet-like environments. We introduce a definition for surrounding cones/belts
and investigate flavor dependence and correlation of different hadron species
produced in jets. Here, we focus on proton-triggered correlations. Our analysis
can be extended for heavy ion collisions.
|
[
{
"created": "Wed, 24 Nov 2010 12:58:01 GMT",
"version": "v1"
}
] |
2011-03-18
|
[
[
"Agócs",
"A. G.",
""
],
[
"Barnaföldi",
"G. G.",
""
],
[
"Lévai",
"P.",
""
]
] |
Jet-matter interaction remains a central question and a theoretical challenge in heavy-ion physics and might become important in high-multiplicity events in proton-proton collisions at LHC energies. Full jet measurement at LHC offer the proper tool to investigate energy loss process and fragmentation of hard parton in the medium. Since jet reconstruction will be constrained to small cone sizes, then study of the connection between jets and surrounding environment provides a further possibility to extend our exploration. We study jets at s = (14 TeV)^2 and pp collisions at s = (7 TeV)^2. We analyze the flavor components in jet-like environments. We introduce a definition for surrounding cones/belts and investigate flavor dependence and correlation of different hadron species produced in jets. Here, we focus on proton-triggered correlations. Our analysis can be extended for heavy ion collisions.
|
1811.04260
|
Jialun Ping
|
Hongxia Huang, Jialun Ping
|
Investigating the hidden-charm and hidden-bottom pentaquark resonances
in scattering process
|
9 pages, 8 figures
|
Phys. Rev. D 99, 014010 (2019)
|
10.1103/PhysRevD.99.014010
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In the framework of quark delocalization color screening model, both the
hidden-charm and hidden-bottom pentaquark resonances are studied in the
hadron-hadron scattering process. A few narrow pentaquark resonances with
hidden-charm above $4.2$ GeV, and some narrow pentaquark resonances with
hidden-bottom above $11$ GeV are found from corresponding scattering processes.
Besides, the states $N\eta_{c}$, $NJ/\psi$, $N\eta_{b}$ and $N\Upsilon$ with
$IJ^{P}=\frac{1}{2}\frac{1}{2}^{-}$, as well as $NJ/\psi$ and $N\Upsilon$ with
$IJ^{P}=\frac{1}{2}\frac{3}{2}^{-}$ are all possible to be bound by
channel-coupling calculation. All these heavy pentaquarks are worth searching
in the future experiments.
|
[
{
"created": "Sat, 10 Nov 2018 14:27:33 GMT",
"version": "v1"
}
] |
2019-01-16
|
[
[
"Huang",
"Hongxia",
""
],
[
"Ping",
"Jialun",
""
]
] |
In the framework of quark delocalization color screening model, both the hidden-charm and hidden-bottom pentaquark resonances are studied in the hadron-hadron scattering process. A few narrow pentaquark resonances with hidden-charm above $4.2$ GeV, and some narrow pentaquark resonances with hidden-bottom above $11$ GeV are found from corresponding scattering processes. Besides, the states $N\eta_{c}$, $NJ/\psi$, $N\eta_{b}$ and $N\Upsilon$ with $IJ^{P}=\frac{1}{2}\frac{1}{2}^{-}$, as well as $NJ/\psi$ and $N\Upsilon$ with $IJ^{P}=\frac{1}{2}\frac{3}{2}^{-}$ are all possible to be bound by channel-coupling calculation. All these heavy pentaquarks are worth searching in the future experiments.
|
1710.02195
|
Pierre Sikivie
|
Sankha S. Chakrabarty, Seishi Enomoto, Yaqi Han, Pierre Sikivie and
Elisa M. Todarello
|
Gravitational self-interactions of a degenerate quantum scalar field
|
39 pages, 3 figures. A more detailed discussion of the duration of
classicality is given, correcting relatively inconsequential
errors/misunderstandings in the original version of this paper
|
Phys. Rev. D 97, 043531 (2018)
|
10.1103/PhysRevD.97.043531
| null |
hep-ph astro-ph.CO hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We develop a formalism to help calculate in quantum field theory the
departures from the description of a system by classical field equations. We
apply the formalism to a homogeneous condensate with attractive contact
interactions and to a homogeneous self-gravitating condensate in critical
expansion. In their classical descriptions, such condensates persist forever.
We show that in their quantum description, parametric resonance causes quanta
to jump in pairs out of the condensate into all modes with wavector less than
some critical value. We calculate in each case the time scale over which the
homogeneous condensate is depleted, and after which a classical description is
invalid. We argue that the duration of classicality of inhomogeneous
condensates is shorter than that of homogeneous condensates.
|
[
{
"created": "Thu, 5 Oct 2017 20:00:02 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Jan 2018 22:28:35 GMT",
"version": "v2"
}
] |
2018-03-07
|
[
[
"Chakrabarty",
"Sankha S.",
""
],
[
"Enomoto",
"Seishi",
""
],
[
"Han",
"Yaqi",
""
],
[
"Sikivie",
"Pierre",
""
],
[
"Todarello",
"Elisa M.",
""
]
] |
We develop a formalism to help calculate in quantum field theory the departures from the description of a system by classical field equations. We apply the formalism to a homogeneous condensate with attractive contact interactions and to a homogeneous self-gravitating condensate in critical expansion. In their classical descriptions, such condensates persist forever. We show that in their quantum description, parametric resonance causes quanta to jump in pairs out of the condensate into all modes with wavector less than some critical value. We calculate in each case the time scale over which the homogeneous condensate is depleted, and after which a classical description is invalid. We argue that the duration of classicality of inhomogeneous condensates is shorter than that of homogeneous condensates.
|
hep-ph/0512155
|
Szabolcs Borsanyi
|
Jurgen Berges, Szabolcs Borsanyi (Heidelberg)
|
Range of validity of transport equations
|
23 latex pages, 9 figures
|
Phys.Rev.D74:045022,2006
|
10.1103/PhysRevD.74.045022
| null |
hep-ph
| null |
Transport equations can be derived from quantum field theory assuming a loss
of information about the details of the initial state and a gradient expansion.
While the latter can be systematically improved, the assumption about a memory
loss is in general not controlled by a small expansion parameter. We determine
the range of validity of transport equations for the example of a scalar $g^2
\Phi^4$ theory. We solve the nonequilibrium time evolution using the three-loop
2PI effective action. The approximation includes off-shell and memory effects
and assumes no gradient expansion. This is compared to transport equations to
lowest order (LO) and beyond (NLO). We find that the earliest time for the
validity of transport equations is set by the characteristic relaxation time
scale $t_{\rm damp} = - 2\omega/\Sigma^{\rm (eq)}_\varrho$, where $-\Sigma^{\rm
(eq)}_\varrho/2$ denotes the on-shell imaginary-part of the self-energy. This
time scale agrees with the characteristic time for partial memory loss, but is
much shorter than thermal equilibration times. For times larger than about
$t_{\rm damp}$ the gradient expansion to NLO is found to describe the ``full''
results rather well for $g^2 \lesssim 1$.
|
[
{
"created": "Mon, 12 Dec 2005 20:39:36 GMT",
"version": "v1"
}
] |
2010-02-04
|
[
[
"Berges",
"Jurgen",
"",
"Heidelberg"
],
[
"Borsanyi",
"Szabolcs",
"",
"Heidelberg"
]
] |
Transport equations can be derived from quantum field theory assuming a loss of information about the details of the initial state and a gradient expansion. While the latter can be systematically improved, the assumption about a memory loss is in general not controlled by a small expansion parameter. We determine the range of validity of transport equations for the example of a scalar $g^2 \Phi^4$ theory. We solve the nonequilibrium time evolution using the three-loop 2PI effective action. The approximation includes off-shell and memory effects and assumes no gradient expansion. This is compared to transport equations to lowest order (LO) and beyond (NLO). We find that the earliest time for the validity of transport equations is set by the characteristic relaxation time scale $t_{\rm damp} = - 2\omega/\Sigma^{\rm (eq)}_\varrho$, where $-\Sigma^{\rm (eq)}_\varrho/2$ denotes the on-shell imaginary-part of the self-energy. This time scale agrees with the characteristic time for partial memory loss, but is much shorter than thermal equilibration times. For times larger than about $t_{\rm damp}$ the gradient expansion to NLO is found to describe the ``full'' results rather well for $g^2 \lesssim 1$.
|
1206.4421
|
Ik Jae Shin
|
Kyung Kiu Kim, Youngman Kim, Ik Jae Shin
|
Equations of state and compact stars in gauge/gravity duality
|
15 pages, 9 figures, v2: version accepted for publication in JHEP
| null |
10.1007/JHEP11(2012)045
| null |
hep-ph hep-th nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We propose a new doorway to study the interplay between equations of state of
dense matter and compact stars in gauge/gravity correspondence. For this we
construct a bulk geometry near the boundary of five-dimensional spacetime. By
solving a constraint equation derived from the bulk equation of motion together
with the Tolman-Oppenheimer-Volkoff equation, we determine the equations of
state for compact stars. The input parameters in this study are the energy
density and pressure at the center of the compact objects. We also study how
the equation of state depends on the parameters.
|
[
{
"created": "Wed, 20 Jun 2012 09:10:47 GMT",
"version": "v1"
},
{
"created": "Fri, 9 Nov 2012 02:16:23 GMT",
"version": "v2"
}
] |
2015-06-05
|
[
[
"Kim",
"Kyung Kiu",
""
],
[
"Kim",
"Youngman",
""
],
[
"Shin",
"Ik Jae",
""
]
] |
We propose a new doorway to study the interplay between equations of state of dense matter and compact stars in gauge/gravity correspondence. For this we construct a bulk geometry near the boundary of five-dimensional spacetime. By solving a constraint equation derived from the bulk equation of motion together with the Tolman-Oppenheimer-Volkoff equation, we determine the equations of state for compact stars. The input parameters in this study are the energy density and pressure at the center of the compact objects. We also study how the equation of state depends on the parameters.
|
1609.01346
|
F\'elix Francisco Gonz\'alez Canales
|
Felix Gonzalez-Canales
|
The remnant CP transformation and its implications
|
To be published in Journal of Physics Conference Series (IOP). Joint
Proceedings of the XV Mexican Workshop on Particles and Fields & the XXX
Annual Meeting of the Division of Particles and Fields of the Mexican
Physical Society
| null |
10.1088/1742-6596/761/1/012046
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In the context of remnant CP transformations, I briefly discuss a generalized
$\mu-\tau$ reflection symmetry, where the "Majorana" phases have CP conserving
values, which are directly related with the CP parities of neutrino states.
Also, one finds that the "Dirac-like" CP violation phase is correlated with the
atmospheric mixing angle, giving important phenomenological implications for
current and future long baseline oscillation neutrino experiments.
|
[
{
"created": "Mon, 5 Sep 2016 22:32:05 GMT",
"version": "v1"
}
] |
2016-11-23
|
[
[
"Gonzalez-Canales",
"Felix",
""
]
] |
In the context of remnant CP transformations, I briefly discuss a generalized $\mu-\tau$ reflection symmetry, where the "Majorana" phases have CP conserving values, which are directly related with the CP parities of neutrino states. Also, one finds that the "Dirac-like" CP violation phase is correlated with the atmospheric mixing angle, giving important phenomenological implications for current and future long baseline oscillation neutrino experiments.
|
hep-ph/9810266
|
Carlos Munoz
|
J.A. Casas, A. Ibarra and C. Mu\~noz
|
Phenomenological viability of string and M-theory scenarios
|
18 pages + 10 figures, PostScript file
|
Nucl.Phys. B554 (1999) 67-85
|
10.1016/S0550-3213(99)00065-6
|
IEM-FT-183/98, FTUAM 98/18, IFT-UAM/CSIC-98-15
|
hep-ph
| null |
We analyze the constraints that a correct phenomenology and the absence of
dangerous charge and color breaking (CCB) minima or unbounded from below (UFB)
directions impose on the parameter space of different superstring and M-theory
scenarios. Namely, we analyze in detail the case where supersymmetry (SUSY)
breaking is driven by non-vanishing dilaton and/or moduli F-terms in weakly and
strongly coupled strings, and the specific case where the mechanism of SUSY
breaking is gaugino condensation with or without the participation of
non-perturbative contributions to the K{\"a}hler potential. The results
indicate that, only in some small windows of the parameter space all the
previous tests are succesfully passed. We also discuss the impact of
non-universality of the soft breaking terms on CCB/UFB bounds.
|
[
{
"created": "Tue, 6 Oct 1998 18:32:02 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Casas",
"J. A.",
""
],
[
"Ibarra",
"A.",
""
],
[
"Muñoz",
"C.",
""
]
] |
We analyze the constraints that a correct phenomenology and the absence of dangerous charge and color breaking (CCB) minima or unbounded from below (UFB) directions impose on the parameter space of different superstring and M-theory scenarios. Namely, we analyze in detail the case where supersymmetry (SUSY) breaking is driven by non-vanishing dilaton and/or moduli F-terms in weakly and strongly coupled strings, and the specific case where the mechanism of SUSY breaking is gaugino condensation with or without the participation of non-perturbative contributions to the K{\"a}hler potential. The results indicate that, only in some small windows of the parameter space all the previous tests are succesfully passed. We also discuss the impact of non-universality of the soft breaking terms on CCB/UFB bounds.
|
hep-ph/9405335
|
Ian Balitsky
|
I.Balitsky
|
Instanton interactions and non-perturbative particle production in QCD
|
28p., PSU/TH/146. Talk presented at the Workshop `Continuous Advances
in QCD', Minneapolis, Feb 1994
| null | null | null |
hep-ph
| null |
I discuss the possible instanton-induced multiparticle production in hard
processes in QCD Figures are available upon request
|
[
{
"created": "Thu, 19 May 1994 20:47:07 GMT",
"version": "v1"
}
] |
2009-09-25
|
[
[
"Balitsky",
"I.",
""
]
] |
I discuss the possible instanton-induced multiparticle production in hard processes in QCD Figures are available upon request
|
1901.11361
|
Siddhartha Karmakar
|
Siddhartha Karmakar, Subhendu Rakshit
|
Relaxed constraints on the heavy scalar masses in 2HDM
|
32 pages, to appear in Physical Review D
|
Phys. Rev. D 100, 055016 (2019)
|
10.1103/PhysRevD.100.055016
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In the wake of new scalar searches at LHC in various channels, it is
interesting to investigate the sacrosanctity of the constraints on the masses
and couplings of the heavier scalars in a two-Higgs-doublet model (2HDM). We
consider the effects of new physics beyond a 2HDM encoded in terms of bosonic
dim-6 operators. Although these constraints are mostly immune to such new
physics, we demonstrate for a specific class of bosonic operators, the
constraints on the masses of the exotic scalars from cascade decays can get
substantially relaxed. We present such effects for both degenerate and
hierarchical mass spectra of the heavier scalars in 2HDM. Some decay channels
of the new scalars vanish at the alignment limit in the tree-level 2HDM. But
the inclusion of dim-6 terms can lead to significant cross-sections for such
processes. It is also pointed out that observation of such processes can no
longer rule out the alignment limit if such dim-6 operators are present.
|
[
{
"created": "Thu, 31 Jan 2019 14:07:33 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Aug 2019 17:03:28 GMT",
"version": "v2"
}
] |
2019-09-25
|
[
[
"Karmakar",
"Siddhartha",
""
],
[
"Rakshit",
"Subhendu",
""
]
] |
In the wake of new scalar searches at LHC in various channels, it is interesting to investigate the sacrosanctity of the constraints on the masses and couplings of the heavier scalars in a two-Higgs-doublet model (2HDM). We consider the effects of new physics beyond a 2HDM encoded in terms of bosonic dim-6 operators. Although these constraints are mostly immune to such new physics, we demonstrate for a specific class of bosonic operators, the constraints on the masses of the exotic scalars from cascade decays can get substantially relaxed. We present such effects for both degenerate and hierarchical mass spectra of the heavier scalars in 2HDM. Some decay channels of the new scalars vanish at the alignment limit in the tree-level 2HDM. But the inclusion of dim-6 terms can lead to significant cross-sections for such processes. It is also pointed out that observation of such processes can no longer rule out the alignment limit if such dim-6 operators are present.
|
1303.2534
|
Tarak Thakore Mr.
|
Tarak Thakore (TIFR, Mumbai), Anushree Ghosh (Harish-Chandra Res.
Inst.), Sandhya Choubey (Harish-Chandra Res. Inst.), Amol Dighe (TIFR,
Mumbai)
|
The Reach of INO for Atmospheric Neutrino Oscillation Parameters
|
19 pages, 18 pdf figures, Uses pdflatex
|
JHEP 1305 (2013) 058
|
10.1007/JHEP05(2013)058
|
TIFR/TH/13-06
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The India-based Neutrino Observatory (INO) will host a 50 kt magnetized iron
calorimeter (ICAL@INO) for the study of atmospheric neutrinos. Using the
detector resolutions and efficiencies obtained by the INO collaboration from a
full-detector GEANT4-based simulation, we determine the reach of this
experiment for the measurement of the atmospheric neutrino mixing parameters
($\sin^2 \theta_{23}$ and $|\Delta m_{32}^2 |$). We also explore the
sensitivity of this experiment to the deviation of $\theta_{23}$ from maximal
mixing, and its octant.
|
[
{
"created": "Mon, 11 Mar 2013 14:25:46 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Jun 2013 05:38:25 GMT",
"version": "v2"
}
] |
2013-06-07
|
[
[
"Thakore",
"Tarak",
"",
"TIFR, Mumbai"
],
[
"Ghosh",
"Anushree",
"",
"Harish-Chandra Res.\n Inst."
],
[
"Choubey",
"Sandhya",
"",
"Harish-Chandra Res. Inst."
],
[
"Dighe",
"Amol",
"",
"TIFR,\n Mumbai"
]
] |
The India-based Neutrino Observatory (INO) will host a 50 kt magnetized iron calorimeter (ICAL@INO) for the study of atmospheric neutrinos. Using the detector resolutions and efficiencies obtained by the INO collaboration from a full-detector GEANT4-based simulation, we determine the reach of this experiment for the measurement of the atmospheric neutrino mixing parameters ($\sin^2 \theta_{23}$ and $|\Delta m_{32}^2 |$). We also explore the sensitivity of this experiment to the deviation of $\theta_{23}$ from maximal mixing, and its octant.
|
hep-ph/0102030
|
Shinji Komine
|
Shinji Komine
|
Higgs mass and b to s gamma constraints on SUSY models with no-scale
boundary condition
|
16 pages, 9 figures
| null | null | null |
hep-ph
| null |
No-scale structure of the Kahler potential is obtained in many types of
supersymmetric models. In this paper, phenomenological aspects of these models
are investigated with special attention to the current Higgs mass bound at LEP
and b \to s \gamma result at the CLEO. When the boundary condition is given at
the GUT scale and gaugino masses are universal at this scale, very narrow
parameter region is allowed only for positive Higgsino mass region if R-parity
is conserved. The negative Higgsino mass case is entirely excluded. On the
other hand, relatively large parameter region is allowed when the boundary
condition is given above the GUT scale, and Tevatron can discover SUSY signals
for the positive Higgs mass case. The no-scale models with Wino, Higgsino or
sneutrino LSP are also considered. We show that the Higgs mass constraint is
important for the Higgsino LSP case, which requires the LSP mass to be larger
than about 245 GeV.
|
[
{
"created": "Sun, 4 Feb 2001 07:12:38 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Mar 2001 03:45:18 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Komine",
"Shinji",
""
]
] |
No-scale structure of the Kahler potential is obtained in many types of supersymmetric models. In this paper, phenomenological aspects of these models are investigated with special attention to the current Higgs mass bound at LEP and b \to s \gamma result at the CLEO. When the boundary condition is given at the GUT scale and gaugino masses are universal at this scale, very narrow parameter region is allowed only for positive Higgsino mass region if R-parity is conserved. The negative Higgsino mass case is entirely excluded. On the other hand, relatively large parameter region is allowed when the boundary condition is given above the GUT scale, and Tevatron can discover SUSY signals for the positive Higgs mass case. The no-scale models with Wino, Higgsino or sneutrino LSP are also considered. We show that the Higgs mass constraint is important for the Higgsino LSP case, which requires the LSP mass to be larger than about 245 GeV.
|
2007.03908
|
Andrej Arbuzov
|
Andrej Arbuzov, Serge Bondarenko, Lidia Kalinovskaya
|
Asymmetries in Processes of Electron-Positron Annihilation
|
18 pages, 10 figures, references are updated
|
published in Symmetry 12(7), (2020), 1132
|
10.3390/sym12071132
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Processes of electron-positron annihilation into a pair of fermions were
considered. Forward-backward and left-right asymmetries were studied, taking
into account polarization of initial and final particles. Complete 1-loop
electroweak radiative corrections were included. A wide energy range including
the $Z$ boson peak and higher energies relevant for future $e^+e^-$ colliders
was covered. Sensitivity of observable asymmetries to the electroweak mixing
angle and fermion weak coupling was discussed.
|
[
{
"created": "Wed, 8 Jul 2020 05:50:42 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Jul 2020 09:57:51 GMT",
"version": "v2"
}
] |
2020-07-24
|
[
[
"Arbuzov",
"Andrej",
""
],
[
"Bondarenko",
"Serge",
""
],
[
"Kalinovskaya",
"Lidia",
""
]
] |
Processes of electron-positron annihilation into a pair of fermions were considered. Forward-backward and left-right asymmetries were studied, taking into account polarization of initial and final particles. Complete 1-loop electroweak radiative corrections were included. A wide energy range including the $Z$ boson peak and higher energies relevant for future $e^+e^-$ colliders was covered. Sensitivity of observable asymmetries to the electroweak mixing angle and fermion weak coupling was discussed.
|
1303.7009
|
Benjamin Nachman
|
Benjamin Nachman and Christopher G. Lester
|
Significance Variables
|
21 pages, 7 figures
|
Phys. Rev. D 88, 075013 (2013)
|
10.1103/PhysRevD.88.075013
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Many particle physics analyses which need to discriminate some background
process from a signal ignore event-by-event resolutions of kinematic variables.
Adding this information, as is done for missing momentum significance, can only
improve the power of existing techniques. We therefore propose the use of
significance variables which combine kinematic information with event-by-event
resolutions. We begin by giving some explicit examples of constructing optimal
significance variables. Then, we consider three applications: new heavy gauge
bosons, Higgs to $\tau\tau$, and direct stop squark pair production. We find
that significance variables can provide additional discriminating power over
the original kinematic variables: $\sim$ 20% improvement over $m_T$ in the case
of $H\rightarrow\tau\tau$ case, and $\sim$ 30% impovement over $m_{T2}$ in the
case of the direct stop search.
|
[
{
"created": "Wed, 27 Mar 2013 23:57:11 GMT",
"version": "v1"
}
] |
2013-10-30
|
[
[
"Nachman",
"Benjamin",
""
],
[
"Lester",
"Christopher G.",
""
]
] |
Many particle physics analyses which need to discriminate some background process from a signal ignore event-by-event resolutions of kinematic variables. Adding this information, as is done for missing momentum significance, can only improve the power of existing techniques. We therefore propose the use of significance variables which combine kinematic information with event-by-event resolutions. We begin by giving some explicit examples of constructing optimal significance variables. Then, we consider three applications: new heavy gauge bosons, Higgs to $\tau\tau$, and direct stop squark pair production. We find that significance variables can provide additional discriminating power over the original kinematic variables: $\sim$ 20% improvement over $m_T$ in the case of $H\rightarrow\tau\tau$ case, and $\sim$ 30% impovement over $m_{T2}$ in the case of the direct stop search.
|
hep-ph/0611104
|
Alexander Studenikin
|
Alexander Studenikin
|
Neutrinos and electrons in background matter
|
submitted to J.Phys.: Conference Series (Proceedings of Neutrino 2006
Conference, June 2006, Santa Fe, New Mexico)
|
Nuclear Physics B (Proc. Suppl.) 221 (2011) 400
|
10.1016/j.nuclphysbps.2011.10.048
| null |
hep-ph
| null |
We present a rather powerful method in investigations of different phenomena
that can appear when neutrinos and electrons propagate in background matter.
This method is based on the use of the modified Dirac equations for particles
wave functions, in which the correspondent effective potentials accounting for
the matter influence on particles are included.
|
[
{
"created": "Wed, 8 Nov 2006 18:12:09 GMT",
"version": "v1"
}
] |
2015-06-25
|
[
[
"Studenikin",
"Alexander",
""
]
] |
We present a rather powerful method in investigations of different phenomena that can appear when neutrinos and electrons propagate in background matter. This method is based on the use of the modified Dirac equations for particles wave functions, in which the correspondent effective potentials accounting for the matter influence on particles are included.
|
0905.2986
|
Jing Shao
|
Gordon Kane, Piyush Kumar and Jing Shao
|
CP-violating Phases in M-theory and Implications for EDMs
|
15 pages, 5 figures; v2: references added, minor clarifications,
version published in Physical Review D
|
Phys.Rev.D82:055005,2010
|
10.1103/PhysRevD.82.055005
| null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We demonstrate that in effective theories arising from a class of N=1
fluxless compactifications of M-theory on a G2 manifold with low energy
supersymmetry, CP-violating phases do not appear in the soft-breaking
Lagrangian except via the Yukawas appearing in the trilinear parameters. Such a
mechanism may be present in other string compactifications as well; we describe
properties sufficient for this to occur. CP violation is generated via the
Yukawas since the soft trilinear matrices are generically not proportional to
the Yukawa matrices. Within the framework considered, the estimated theoretical
upper bounds for electric dipole moments (EDM) of the electron, neutron and
mercury are all within the current experimental limits and could be probed in
the near future.
|
[
{
"created": "Mon, 18 May 2009 21:11:55 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Jan 2011 22:13:12 GMT",
"version": "v2"
}
] |
2011-01-26
|
[
[
"Kane",
"Gordon",
""
],
[
"Kumar",
"Piyush",
""
],
[
"Shao",
"Jing",
""
]
] |
We demonstrate that in effective theories arising from a class of N=1 fluxless compactifications of M-theory on a G2 manifold with low energy supersymmetry, CP-violating phases do not appear in the soft-breaking Lagrangian except via the Yukawas appearing in the trilinear parameters. Such a mechanism may be present in other string compactifications as well; we describe properties sufficient for this to occur. CP violation is generated via the Yukawas since the soft trilinear matrices are generically not proportional to the Yukawa matrices. Within the framework considered, the estimated theoretical upper bounds for electric dipole moments (EDM) of the electron, neutron and mercury are all within the current experimental limits and could be probed in the near future.
|
0903.5540
|
Marina Nielsen
|
Raphael M. Albuquerque, Mirian E. Bracco and Marina Nielsen
|
A QCD sum rule calculation for the Y(4140) narrow structure
|
7 pages, 4 eps figures
| null |
10.1016/j.physletb.2009.06.022
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We use the QCD sum rules to evaluate the mass of a possible scalar mesonic
state that couples to a molecular $D_{s}^{*}\bar{D}_s^{*}$ current. We find a
mass $m_{D_s^*D_s^*}=(4.14\pm 0.09)$ GeV, which is in a excellent agreement
with the recently observed Y(4140) charmonium state. We consider the
contributions of condensates up to dimension eight, we work at leading order in
$\alpha_s$ and we keep terms which are linear in the strange quark mass $m_s$.
We also consider a molecular $D^{*}\bar{D}^{*}$ current and we obtain
$m_{D^*{D}^*}=(4.13\pm 0.10)$, around 200 MeV above the mass of the Y(3930)
charmonium state. We conclude that it is possible to describe the Y(4140)
structure as a $D_s^*\bar{D}_s^*$ molecular state.
|
[
{
"created": "Tue, 31 Mar 2009 19:03:52 GMT",
"version": "v1"
}
] |
2015-05-13
|
[
[
"Albuquerque",
"Raphael M.",
""
],
[
"Bracco",
"Mirian E.",
""
],
[
"Nielsen",
"Marina",
""
]
] |
We use the QCD sum rules to evaluate the mass of a possible scalar mesonic state that couples to a molecular $D_{s}^{*}\bar{D}_s^{*}$ current. We find a mass $m_{D_s^*D_s^*}=(4.14\pm 0.09)$ GeV, which is in a excellent agreement with the recently observed Y(4140) charmonium state. We consider the contributions of condensates up to dimension eight, we work at leading order in $\alpha_s$ and we keep terms which are linear in the strange quark mass $m_s$. We also consider a molecular $D^{*}\bar{D}^{*}$ current and we obtain $m_{D^*{D}^*}=(4.13\pm 0.10)$, around 200 MeV above the mass of the Y(3930) charmonium state. We conclude that it is possible to describe the Y(4140) structure as a $D_s^*\bar{D}_s^*$ molecular state.
|
0909.3047
|
David d'Enterria
|
David d'Enterria and Jean-Philippe Lansberg
|
Study of Higgs boson production and its b-bbar decay in gamma-gamma
processes in proton-nucleus collisions at the LHC
|
22 pages, 8 figures. Tiny changes. Version as published
|
Phys.Rev.D81:014004,2010
|
10.1103/PhysRevD.81.014004
|
SLAC-PUB-13786
|
hep-ph hep-ex nucl-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We explore for the first time the possibilities to measure an
intermediate-mass (mH = 115-140 GeV/c^2) Standard-Model Higgs boson in
electromagnetic proton-lead (pPb) interactions at the CERN Large Hadron
Collider (LHC) via its b-bbar decay. Using equivalent Weizsaecker-Williams
photon fluxes and Higgs effective field theory for the coupling gamma-gamma -->
H, we obtain a leading-order cross section of the order of 0.3 pb for exclusive
Higgs production in elastic (pPb --> gamma-gamma --> p H Pb) and semielastic
(pPb --> gamma-gamma --> Pb H X) processes at sqrt(s) = 8.8 TeV. After applying
various kinematics cuts to remove the main backgrounds (gamma-gamma --> b-bbar
and misidentified gamma-gamma-->q-qbar events), we find that a Higgs boson with
mH = 120 GeV/c^2 could be observed in the b-bbar channel with a
3sigma-significance integrating 300 pb^-1 with an upgraded pA luminosity of
10^31 cm^-2s^-1. We also provide for the first time semielastic Higgs cross
sections, along with elastic t-tbar cross sections, for electromagnetic pp, pA
and AA collisions at the LHC.
|
[
{
"created": "Wed, 16 Sep 2009 16:08:08 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Sep 2009 18:56:59 GMT",
"version": "v2"
},
{
"created": "Mon, 11 Jan 2010 17:47:14 GMT",
"version": "v3"
}
] |
2010-01-27
|
[
[
"d'Enterria",
"David",
""
],
[
"Lansberg",
"Jean-Philippe",
""
]
] |
We explore for the first time the possibilities to measure an intermediate-mass (mH = 115-140 GeV/c^2) Standard-Model Higgs boson in electromagnetic proton-lead (pPb) interactions at the CERN Large Hadron Collider (LHC) via its b-bbar decay. Using equivalent Weizsaecker-Williams photon fluxes and Higgs effective field theory for the coupling gamma-gamma --> H, we obtain a leading-order cross section of the order of 0.3 pb for exclusive Higgs production in elastic (pPb --> gamma-gamma --> p H Pb) and semielastic (pPb --> gamma-gamma --> Pb H X) processes at sqrt(s) = 8.8 TeV. After applying various kinematics cuts to remove the main backgrounds (gamma-gamma --> b-bbar and misidentified gamma-gamma-->q-qbar events), we find that a Higgs boson with mH = 120 GeV/c^2 could be observed in the b-bbar channel with a 3sigma-significance integrating 300 pb^-1 with an upgraded pA luminosity of 10^31 cm^-2s^-1. We also provide for the first time semielastic Higgs cross sections, along with elastic t-tbar cross sections, for electromagnetic pp, pA and AA collisions at the LHC.
|
1610.07922
|
Reisaburo Tanaka
|
D. de Florian, C. Grojean, F. Maltoni, C. Mariotti, A. Nikitenko, M.
Pieri, P. Savard, M. Schumacher, R. Tanaka (eds.), R. Aggleton, M. Ahmad, B.
Allanach, C. Anastasiou, W. Astill, S. Badger, M. Badziak, J. Baglio, E.
Bagnaschi, A. Ballestrero, A. Banfi, D. Barducci, M. Beckingham, C. Becot, G.
B\'elanger, J. Bellm, N. Belyaev, F.U. Bernlochner, C. Beskidt, A.
Biek\"otter, F. Bishara, W. Bizon, N.E. Bomark, M. Bonvini, S. Borowka, V.
Bortolotto, S. Boselli, F.J. Botella, R. Boughezal, G.C. Branco, J. Brehmer,
L. Brenner, S. Bressler, I. Brivio, A. Broggio, H. Brun, G. Buchalla, C.D.
Burgard, A. Calandri, L. Caminada, R. Caminal Armadans, F. Campanario, J.
Campbell, F. Caola, C.M. Carloni Calame, S. Carrazza, A. Carvalho, M.
Casolino, O. Cata, A. Celis, F. Cerutti, N. Chanon, M. Chen, X. Chen, B.
Chokouf\'e Nejad, N. Christensen, M. Ciuchini, R. Contino, T. Corbett, R.
Costa, D. Curtin, M. Dall'Osso, A. David, S. Dawson, J. de Blas, W. de Boer,
P. de Castro Manzano, C. Degrande, R.L. Delgado, F. Demartin, A. Denner, B.
Di Micco, R. Di Nardo, S. Dittmaier, A. Dobado, T. Dorigo, F.A. Dreyer, M.
D\"uhrssen, C. Duhr, F. Dulat, K. Ecker, K. Ellis, U. Ellwanger, C. Englert,
D. Espriu, A. Falkowski, L. Fayard, R. Feger, G. Ferrera, A. Ferroglia, N.
Fidanza, T. Figy, M. Flechl, D. Fontes, S. Forte, P. Francavilla, E. Franco,
R. Frederix, A. Freitas, F.F. Freitas, F. Frensch, S. Frixione, B. Fuks, E.
Furlan, S. Gadatsch, J. Gao, Y. Gao, M.V. Garzelli, T. Gehrmann, R. Gerosa,
M. Ghezzi, D. Ghosh, S. Gieseke, D. Gillberg, G.F. Giudice, E.W.N. Glover, F.
Goertz, D. Gon\c{c}alves, J. Gonzalez-Fraile, M. Gorbahn, S. Gori, C.A.
Gottardo, M. Gouzevitch, P. Govoni, D. Gray, M. Grazzini, N. Greiner, A.
Greljo, J. Grigo, A.V. Gritsan, R. Gr\"ober, S. Guindon, H.E. Haber, C. Han,
T. Han, R. Harlander, M.A. Harrendorf, H.B. Hartanto, C. Hays, S. Heinemeyer,
G. Heinrich, M. Herrero, F. Herzog, B. Hespel, V. Hirschi, S. Hoeche, S.
Honeywell, S.J. Huber, C. Hugonie, J. Huston, A. Ilnicka, G. Isidori, B.
J\"ager, M. Jaquier, S.P. Jones, A. Juste, S. Kallweit, A. Kaluza, A. Kardos,
A. Karlberg, Z. Kassabov, N. Kauer, D.I. Kazakov, M. Kerner, W. Kilian, F.
Kling, K. K\"oneke, R. Kogler, R. Konoplich, S. Kortner, S. Kraml, C. Krause,
F. Krauss, M. Krawczyk, A. Kulesza, S. Kuttimalai, R. Lane, A. Lazopoulos, G.
Lee, P. Lenzi, I.M. Lewis, Y. Li, S. Liebler, J. Lindert, X. Liu, Z. Liu,
F.J. Llanes-Estrada, H.E. Logan, D. Lopez-Val, I. Low, G. Luisoni, P.
Maierh\"ofer, E. Maina, B. Mansouli\'e, H. Mantler, M. Mantoani, A.C. Marini,
V.I. Martinez Outschoorn, S. Marzani, D. Marzocca, A. Massironi, K. Mawatari,
J. Mazzitelli, A. McCarn, B. Mellado, K. Melnikov, S.B. Menari, L. Merlo, C.
Meyer, P. Milenovic, K. Mimasu, S. Mishima, B. Mistlberger, S.-O. Moch, A.
Mohammadi, P.F. Monni, G. Montagna, M. Moreno Ll\'acer, N. Moretti, S.
Moretti, L. Motyka, A. M\"uck, M. M\"uhlleitner, S. Munir, P. Musella, P.
Nadolsky, D. Napoletano, M. Nebot, C. Neu, M. Neubert, R. Nevzorov, O.
Nicrosini, J. Nielsen, K. Nikolopoulos, J.M. No, C. O'Brien, T. Ohl, C.
Oleari, T. Orimoto, D. Pagani, C.E. Pandini, A. Papaefstathiou, A.S.
Papanastasiou, G. Passarino, B.D. Pecjak, M. Pelliccioni, G. Perez, L.
Perrozzi, F. Petriello, G. Petrucciani, E. Pianori, F. Piccinini, M. Pierini,
A. Pilkington, S. Pl\"atzer, T. Plehn, R. Podskubka, C.T. Potter, S.
Pozzorini, K. Prokofiev, A. Pukhov, I. Puljak, M. Queitsch-Maitland, J.
Quevillon, D. Rathlev, M. Rauch, E. Re, M.N. Rebelo, D. Rebuzzi, L. Reina, C.
Reuschle, J. Reuter, M. Riembau, F. Riva, A. Rizzi, T. Robens, R. R\"ontsch,
J. Rojo, J.C. Rom\~ao, N. Rompotis, J. Roskes, R. Roth, G.P. Salam, R.
Salerno, M.O.P. Sampaio, R. Santos, V. Sanz, J.J. Sanz-Cillero, H. Sargsyan,
U. Sarica, P. Schichtel, J. Schlenk, T. Schmidt, C. Schmitt, M. Sch\"onherr,
U. Schubert, M. Schulze, S. Sekula, M. Sekulla, E. Shabalina, H.S. Shao, J.
Shelton, C.H. Shepherd-Themistocleous, S.Y. Shim, F. Siegert, A. Signer, J.P.
Silva, L. Silvestrini, M. Sjodahl, P. Slavich, M. Slawinska, L. Soffi, M.
Spannowsky, C. Speckner, D.M. Sperka, M. Spira, O. St\r{a}l, F. Staub, T.
Stebel, T. Stefaniak, M. Steinhauser, I.W. Stewart, M.J. Strassler, J.
Streicher, D.M. Strom, S. Su, X. Sun, F.J. Tackmann, K. Tackmann, A.M.
Teixeira, R. Teixeira de Lima, V. Theeuwes, R. Thorne, D. Tommasini, P.
Torrielli, M. Tosi, F. Tramontano, Z. Tr\'ocs\'anyi, M. Trott, I. Tsinikos,
M. Ubiali, P. Vanlaer, W. Verkerke, A. Vicini, L. Viliani, E. Vryonidou, D.
Wackeroth, C.E.M. Wagner, J. Wang, S. Wayand, G. Weiglein, C. Weiss, M.
Wiesemann, C. Williams, J. Winter, D. Winterbottom, R. Wolf, M. Xiao, L.L.
Yang, R. Yohay, S.P.Y. Yuen, G. Zanderighi, M. Zaro, D. Zeppenfeld, R.
Ziegler, T. Zirke, J. Zupan (The LHC Higgs Cross Section Working Group)
|
Handbook of LHC Higgs Cross Sections: 4. Deciphering the Nature of the
Higgs Sector
|
869 pages, 295 figures, 248 tables and 1645 citations. Working Group
web page: https://twiki.cern.ch/twiki/bin/view/LHCPhysics/LHCHXSWG
| null |
10.23731/CYRM-2017-002
|
CERN Yellow Reports: Monographs Volume 2/2017 (CERN--2017--002-M)
|
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
This Report summarizes the results of the activities of the LHC Higgs Cross
Section Working Group in the period 2014-2016. The main goal of the working
group was to present the state-of-the-art of Higgs physics at the LHC,
integrating all new results that have appeared in the last few years. The first
part compiles the most up-to-date predictions of Higgs boson production cross
sections and decay branching ratios, parton distribution functions, and
off-shell Higgs boson production and interference effects. The second part
discusses the recent progress in Higgs effective field theory predictions,
followed by the third part on pseudo-observables, simplified template cross
section and fiducial cross section measurements, which give the baseline
framework for Higgs boson property measurements. The fourth part deals with the
beyond the Standard Model predictions of various benchmark scenarios of Minimal
Supersymmetric Standard Model, extended scalar sector, Next-to-Minimal
Supersymmetric Standard Model and exotic Higgs boson decays. This report
follows three previous working-group reports: Handbook of LHC Higgs Cross
Sections: 1. Inclusive Observables (CERN-2011-002), Handbook of LHC Higgs Cross
Sections: 2. Differential Distributions (CERN-2012-002), and Handbook of LHC
Higgs Cross Sections: 3. Higgs properties (CERN-2013-004). The current report
serves as the baseline reference for Higgs physics in LHC Run 2 and beyond.
|
[
{
"created": "Tue, 25 Oct 2016 15:30:43 GMT",
"version": "v1"
},
{
"created": "Mon, 15 May 2017 16:42:19 GMT",
"version": "v2"
}
] |
2017-05-16
|
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"S.",
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"R.",
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"A.",
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"G.",
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"P.",
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"I. M.",
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"Li",
"Y.",
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"S.",
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"J.",
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"Liu",
"X.",
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"Liu",
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"H. E.",
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"K.",
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"The LHC Higgs Cross Section Working Group"
],
[
"Menari",
"S. B.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Merlo",
"L.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Meyer",
"C.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Milenovic",
"P.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Mimasu",
"K.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Mishima",
"S.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Mistlberger",
"B.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Moch",
"S. -O.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Mohammadi",
"A.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Monni",
"P. F.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Montagna",
"G.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Llácer",
"M. Moreno",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Moretti",
"N.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Moretti",
"S.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Motyka",
"L.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Mück",
"A.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Mühlleitner",
"M.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Munir",
"S.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Musella",
"P.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Nadolsky",
"P.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Napoletano",
"D.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Nebot",
"M.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Neu",
"C.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Neubert",
"M.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Nevzorov",
"R.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Nicrosini",
"O.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Nielsen",
"J.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Nikolopoulos",
"K.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"No",
"J. M.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"O'Brien",
"C.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Ohl",
"T.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Oleari",
"C.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Orimoto",
"T.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Pagani",
"D.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Pandini",
"C. E.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Papaefstathiou",
"A.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Papanastasiou",
"A. S.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Passarino",
"G.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Pecjak",
"B. D.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Pelliccioni",
"M.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Perez",
"G.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Perrozzi",
"L.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Petriello",
"F.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Petrucciani",
"G.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Pianori",
"E.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Piccinini",
"F.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Pierini",
"M.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Pilkington",
"A.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Plätzer",
"S.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Plehn",
"T.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Podskubka",
"R.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Potter",
"C. T.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Pozzorini",
"S.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Prokofiev",
"K.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Pukhov",
"A.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Puljak",
"I.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Queitsch-Maitland",
"M.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Quevillon",
"J.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Rathlev",
"D.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Rauch",
"M.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Re",
"E.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Rebelo",
"M. N.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Rebuzzi",
"D.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Reina",
"L.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Reuschle",
"C.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Reuter",
"J.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Riembau",
"M.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Riva",
"F.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Rizzi",
"A.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Robens",
"T.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Röntsch",
"R.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Rojo",
"J.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Romão",
"J. C.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Rompotis",
"N.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Roskes",
"J.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Roth",
"R.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Salam",
"G. P.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Salerno",
"R.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Sampaio",
"M. O. P.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Santos",
"R.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Sanz",
"V.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Sanz-Cillero",
"J. J.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Sargsyan",
"H.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Sarica",
"U.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Schichtel",
"P.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Schlenk",
"J.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Schmidt",
"T.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Schmitt",
"C.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Schönherr",
"M.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Schubert",
"U.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Schulze",
"M.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Sekula",
"S.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Sekulla",
"M.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Shabalina",
"E.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Shao",
"H. S.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Shelton",
"J.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Shepherd-Themistocleous",
"C. H.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Shim",
"S. Y.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Siegert",
"F.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Signer",
"A.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Silva",
"J. P.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Silvestrini",
"L.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Sjodahl",
"M.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Slavich",
"P.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Slawinska",
"M.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Soffi",
"L.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Spannowsky",
"M.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Speckner",
"C.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Sperka",
"D. M.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Spira",
"M.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Stål",
"O.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Staub",
"F.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Stebel",
"T.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Stefaniak",
"T.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Steinhauser",
"M.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Stewart",
"I. W.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Strassler",
"M. J.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Streicher",
"J.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Strom",
"D. M.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Su",
"S.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Sun",
"X.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Tackmann",
"F. J.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Tackmann",
"K.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Teixeira",
"A. M.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"de Lima",
"R. Teixeira",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Theeuwes",
"V.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Thorne",
"R.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Tommasini",
"D.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Torrielli",
"P.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Tosi",
"M.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Tramontano",
"F.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Trócsányi",
"Z.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Trott",
"M.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Tsinikos",
"I.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Ubiali",
"M.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Vanlaer",
"P.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Verkerke",
"W.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Vicini",
"A.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Viliani",
"L.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Vryonidou",
"E.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Wackeroth",
"D.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Wagner",
"C. E. M.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Wang",
"J.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Wayand",
"S.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Weiglein",
"G.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Weiss",
"C.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Wiesemann",
"M.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Williams",
"C.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Winter",
"J.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Winterbottom",
"D.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Wolf",
"R.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Xiao",
"M.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Yang",
"L. L.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Yohay",
"R.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Yuen",
"S. P. Y.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Zanderighi",
"G.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Zaro",
"M.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Zeppenfeld",
"D.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Ziegler",
"R.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Zirke",
"T.",
"",
"The LHC Higgs Cross Section Working Group"
],
[
"Zupan",
"J.",
"",
"The LHC Higgs Cross Section Working Group"
]
] |
This Report summarizes the results of the activities of the LHC Higgs Cross Section Working Group in the period 2014-2016. The main goal of the working group was to present the state-of-the-art of Higgs physics at the LHC, integrating all new results that have appeared in the last few years. The first part compiles the most up-to-date predictions of Higgs boson production cross sections and decay branching ratios, parton distribution functions, and off-shell Higgs boson production and interference effects. The second part discusses the recent progress in Higgs effective field theory predictions, followed by the third part on pseudo-observables, simplified template cross section and fiducial cross section measurements, which give the baseline framework for Higgs boson property measurements. The fourth part deals with the beyond the Standard Model predictions of various benchmark scenarios of Minimal Supersymmetric Standard Model, extended scalar sector, Next-to-Minimal Supersymmetric Standard Model and exotic Higgs boson decays. This report follows three previous working-group reports: Handbook of LHC Higgs Cross Sections: 1. Inclusive Observables (CERN-2011-002), Handbook of LHC Higgs Cross Sections: 2. Differential Distributions (CERN-2012-002), and Handbook of LHC Higgs Cross Sections: 3. Higgs properties (CERN-2013-004). The current report serves as the baseline reference for Higgs physics in LHC Run 2 and beyond.
|
1611.06020
|
Jens Braun
|
Paul Springer, Jens Braun, Stefan Rechenberger, Fabian Rennecke
|
QCD-inspired determination of NJL model parameters
|
10 pages, 4 figures, Contribution to the proceedings of "XIIth Quark
Confinement and the Hadron Spectrum" in Thessaloniki, Greece, Aug 28 - Sep 4,
2016
| null |
10.1051/epjconf/201713703022
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The QCD phase diagram at finite temperature and density has attracted
considerable interest over many decades now, not least because of its relevance
for a better understanding of heavy-ion collision experiments. Models provide
some insight into the QCD phase structure but usually rely on various
parameters. Based on renormalization group arguments, we discuss how the
parameters of QCD low-energy models can be determined from the fundamental
theory of the strong interaction. We particularly focus on a determination of
the temperature dependence of these parameters in this work and comment on the
effect of a finite quark chemical potential. We present first results and argue
that our findings can be used to improve the predictive power of future model
calculations.
|
[
{
"created": "Fri, 18 Nov 2016 09:36:20 GMT",
"version": "v1"
}
] |
2017-04-05
|
[
[
"Springer",
"Paul",
""
],
[
"Braun",
"Jens",
""
],
[
"Rechenberger",
"Stefan",
""
],
[
"Rennecke",
"Fabian",
""
]
] |
The QCD phase diagram at finite temperature and density has attracted considerable interest over many decades now, not least because of its relevance for a better understanding of heavy-ion collision experiments. Models provide some insight into the QCD phase structure but usually rely on various parameters. Based on renormalization group arguments, we discuss how the parameters of QCD low-energy models can be determined from the fundamental theory of the strong interaction. We particularly focus on a determination of the temperature dependence of these parameters in this work and comment on the effect of a finite quark chemical potential. We present first results and argue that our findings can be used to improve the predictive power of future model calculations.
|
1101.4272
|
Ye-Ling Zhou
|
Harald Fritzsch, Zhi-zhong Xing, Ye-Ling Zhou
|
Non-Hermitian Perturbations to the Fritzsch Textures of Lepton and Quark
Mass Matrices
|
14 pages, 4 figures. More discussions added. Accepted for publication
in PLB
|
Phys.Lett.B697:357-363,2011
|
10.1016/j.physletb.2011.02.026
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We show that non-Hermitian and nearest-neighbor-interacting perturbations to
the Fritzsch textures of lepton and quark mass matrices can make both of them
fit current experimental data very well. In particular, we obtain \theta_{23}
\simeq 45^\circ for the atmospheric neutrino mixing angle and predict
\theta_{13} \simeq 3^\circ to 6^\circ for the smallest neutrino mixing angle
when the perturbations in the lepton sector are at the 20% level. The same
level of perturbations is required in the quark sector, where the Jarlskog
invariant of CP violation is about 3.7 \times 10^{-5}. In comparison, the
strength of leptonic CP violation is possible to reach about 1.5 \times 10^{-2}
in neutrino oscillations.
|
[
{
"created": "Sat, 22 Jan 2011 08:16:27 GMT",
"version": "v1"
},
{
"created": "Sat, 12 Feb 2011 03:09:47 GMT",
"version": "v2"
}
] |
2011-03-02
|
[
[
"Fritzsch",
"Harald",
""
],
[
"Xing",
"Zhi-zhong",
""
],
[
"Zhou",
"Ye-Ling",
""
]
] |
We show that non-Hermitian and nearest-neighbor-interacting perturbations to the Fritzsch textures of lepton and quark mass matrices can make both of them fit current experimental data very well. In particular, we obtain \theta_{23} \simeq 45^\circ for the atmospheric neutrino mixing angle and predict \theta_{13} \simeq 3^\circ to 6^\circ for the smallest neutrino mixing angle when the perturbations in the lepton sector are at the 20% level. The same level of perturbations is required in the quark sector, where the Jarlskog invariant of CP violation is about 3.7 \times 10^{-5}. In comparison, the strength of leptonic CP violation is possible to reach about 1.5 \times 10^{-2} in neutrino oscillations.
|
hep-ph/0307239
|
Knecht
|
Marc Knecht
|
The anomalous magnetic moment of the muon: a theoretical introduction
|
Latex, 44 pages, 15 figures
|
Lect.Notes Phys.629:37-84,2004
|
10.1007/b98411
|
CPT-2003/P.4525
|
hep-ph
| null |
These notes, based on the lectures delivered at the 2003 Schladming School of
Theoretical Physics, provide an introduction to the theory of the anomalous
magnetic moments of the muon and of the electron.
|
[
{
"created": "Fri, 18 Jul 2003 14:04:42 GMT",
"version": "v1"
}
] |
2017-08-23
|
[
[
"Knecht",
"Marc",
""
]
] |
These notes, based on the lectures delivered at the 2003 Schladming School of Theoretical Physics, provide an introduction to the theory of the anomalous magnetic moments of the muon and of the electron.
|
1210.2305
|
Hiroshi Okada
|
Yuji Kajiyama, Hiroshi Okada, Takashi Toma
|
Light Dark Matter Candidate in B-L Gauged Radiative Inverse Seesaw
|
10 pages, 1 table, 3 figures; version accepted for publication in
European Physical Journal C
| null |
10.1140/epjc/s10052-013-2381-2
|
KIAS-P12066; IPPP-12-75; DCPT-12-150
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study a radiative inverse seesaw model with local B-L symmetry, in which
we extend the neutrino mass structure that is generated through a kind of
inverse seesaw framework to the more generic one than our previous work. We
focus on a real part of bosonic particle as a dark matter and investigate the
features in O(1-80) GeV mass range, reported by the experiments such as CoGeNT
and XENON (2012).
|
[
{
"created": "Mon, 8 Oct 2012 15:20:02 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Jan 2013 16:54:02 GMT",
"version": "v2"
},
{
"created": "Tue, 19 Mar 2013 14:44:03 GMT",
"version": "v3"
}
] |
2015-06-11
|
[
[
"Kajiyama",
"Yuji",
""
],
[
"Okada",
"Hiroshi",
""
],
[
"Toma",
"Takashi",
""
]
] |
We study a radiative inverse seesaw model with local B-L symmetry, in which we extend the neutrino mass structure that is generated through a kind of inverse seesaw framework to the more generic one than our previous work. We focus on a real part of bosonic particle as a dark matter and investigate the features in O(1-80) GeV mass range, reported by the experiments such as CoGeNT and XENON (2012).
|
1407.2128
|
Gorazd Cvetic
|
Cesar Ayala, Gorazd Cvetic, Antonio Pineda
|
The bottom quark mass from the $\Upsilon(1S)$ system at NNNLO
|
37 pages, 11 figures, minor changes in presentation, version to
appear in JHEP
|
JHEP 1409 (2014) 045
|
10.1007/JHEP09(2014)045
|
USM-TH-326
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We obtain an improved determination of the normalization constant of the
first infrared renormalon of the pole mass (and the singlet static potential).
For $N_f=3$ it reads $N_m=0.563(26)$. Charm quark effects in the bottom quark
mass determination are carefully investigated. Finally, we determine the bottom
quark mass using the NNNLO perturbative expression for the $\Upsilon(1S)$ mass.
We work in the renormalon subtracted scheme, which allows us to control the
divergence of the perturbation series due to pole mass renormalon. Our result
for the ${\overline {\rm MS}}$ mass reads ${\overline m}_{b}({\overline
m}_{b})=4201(43)$ MeV.
|
[
{
"created": "Tue, 8 Jul 2014 15:12:09 GMT",
"version": "v1"
},
{
"created": "Fri, 18 Jul 2014 15:36:22 GMT",
"version": "v2"
},
{
"created": "Mon, 8 Sep 2014 18:07:39 GMT",
"version": "v3"
}
] |
2014-09-25
|
[
[
"Ayala",
"Cesar",
""
],
[
"Cvetic",
"Gorazd",
""
],
[
"Pineda",
"Antonio",
""
]
] |
We obtain an improved determination of the normalization constant of the first infrared renormalon of the pole mass (and the singlet static potential). For $N_f=3$ it reads $N_m=0.563(26)$. Charm quark effects in the bottom quark mass determination are carefully investigated. Finally, we determine the bottom quark mass using the NNNLO perturbative expression for the $\Upsilon(1S)$ mass. We work in the renormalon subtracted scheme, which allows us to control the divergence of the perturbation series due to pole mass renormalon. Our result for the ${\overline {\rm MS}}$ mass reads ${\overline m}_{b}({\overline m}_{b})=4201(43)$ MeV.
|
hep-ph/9703240
|
Sheldon Lee Glashow, Hpop
|
Sidney Coleman and Sheldon L. Glashow
|
Cosmic Ray and Neutrino Tests of Special Relativity
|
7 pages, harvmac, 2nd revision discusses recent indications of
anisotropy of photons propagating over cosmological distances and is
otherwise clarified. Report-no: HUTP-97/A008
|
Phys.Lett.B405:249-252,1997
|
10.1016/S0370-2693(97)00638-2
| null |
hep-ph
| null |
Searches for anisotropies due to Earth's motion relative to a preferred frame
-- modern versions of the Michelson-Morley experiment -- provide precise
verifications of special relativity. We describe other tests, independent of
this motion, that are or can become even more sensitive. The existence of
high-energy cosmic rays places strong constraints on Lorentz non-invariance.
Furthermore, if the maximum attainable speed of a particle depends on its
identity, then neutrinos, even if massless, may exhibit flavor oscillations.
Velocity differences far smaller than any previously probed can produce
characteristic effects at accelerators and solar neutrino experiments.
|
[
{
"created": "Wed, 5 Mar 1997 14:37:49 GMT",
"version": "v1"
},
{
"created": "Tue, 18 Mar 1997 18:13:41 GMT",
"version": "v2"
},
{
"created": "Wed, 30 Apr 1997 17:56:34 GMT",
"version": "v3"
}
] |
2008-11-26
|
[
[
"Coleman",
"Sidney",
""
],
[
"Glashow",
"Sheldon L.",
""
]
] |
Searches for anisotropies due to Earth's motion relative to a preferred frame -- modern versions of the Michelson-Morley experiment -- provide precise verifications of special relativity. We describe other tests, independent of this motion, that are or can become even more sensitive. The existence of high-energy cosmic rays places strong constraints on Lorentz non-invariance. Furthermore, if the maximum attainable speed of a particle depends on its identity, then neutrinos, even if massless, may exhibit flavor oscillations. Velocity differences far smaller than any previously probed can produce characteristic effects at accelerators and solar neutrino experiments.
|
0805.1991
|
Chiara Arina
|
Chiara Arina
|
Sneutrino cold dark matter in extended MSSM models
|
4 pages, 2 figures, Prepared for Moriond EW session 2008, La Thuile,
Italy, 1-8 March 2008
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A thorough analysis of sneutrinos as dark matter candidates is performed, in
different classes of supersymmetric models, as is typically done for the
neutralino dark matter. First in the Minimal Supersymmetric Standard Model,
sneutrinos are marginally compatible with existing experimental bounds,
including direct detection, provided they compose a subdominant component of
dark matter. Then supersymmetric models with the inclusion of right-handed
fields and lepton number violating terms are presented. These models are
perfectly viable: they predict sneutrinos which are compatible with the current
direct detection sensitivities.
|
[
{
"created": "Wed, 14 May 2008 08:01:25 GMT",
"version": "v1"
}
] |
2008-05-15
|
[
[
"Arina",
"Chiara",
""
]
] |
A thorough analysis of sneutrinos as dark matter candidates is performed, in different classes of supersymmetric models, as is typically done for the neutralino dark matter. First in the Minimal Supersymmetric Standard Model, sneutrinos are marginally compatible with existing experimental bounds, including direct detection, provided they compose a subdominant component of dark matter. Then supersymmetric models with the inclusion of right-handed fields and lepton number violating terms are presented. These models are perfectly viable: they predict sneutrinos which are compatible with the current direct detection sensitivities.
|
hep-ph/9705244
|
Marco Fabbrichesi
|
S. Bertolini, J.O. Eeg, M. Fabbrichesi and E.I. Lashin
|
The Delta I = 1/2 Rule and B_K at O(p^4) in the Chiral Expansion
|
Latex2e, JHEP.cls, 32 pages, 9 figures. Short-distance analysis
updated. Parts of Sects. 3 and 6 revised
|
Nucl.Phys. B514 (1998) 63-92
|
10.1016/S0550-3213(97)00787-6
|
SISSA 4/97/EP
|
hep-ph
| null |
We calculate the hadronic matrix elements to $O(p^4)$ in the chiral expansion
for the ($\Delta S =1$) $K^0 \to 2 \pi$ decays and the ($\Delta S=2$) $\bar
K^0$-$K^0$ oscillation. This is done within the framework of the chiral quark
model. The chiral coefficients thus determined depend on the values of the
quark and gluon condensates and the constituent quark mass. We show that it is
possible to fit the $\Delta I =1/2$ rule of kaon decays with values of the
condensates close to those obtained by QCD sum rules. The renormalization
invariant amplitudes are obtained by matching the hadronic matrix elements and
their chiral corrections to the short-distance NLO Wilson coefficients. For the
same input values, we study the parameter $\hat B_K$ of kaon oscillation and
find $\hat B_K = 1.1 \pm 0.2$. As an independent check, we determine $\hat B_K$
from the experimental value of the $K_L$-$K_S$ mass difference by using our
calculation of the long-distance contributions. The destructive interplay
between the short- and long-distance amplitudes yields $\hat B_K = 1.2 \pm
0.1$, in agreement with the direct calculation.
|
[
{
"created": "Tue, 6 May 1997 15:02:41 GMT",
"version": "v1"
},
{
"created": "Mon, 26 May 1997 13:33:13 GMT",
"version": "v2"
},
{
"created": "Thu, 25 Sep 1997 17:45:49 GMT",
"version": "v3"
},
{
"created": "Mon, 24 Nov 1997 14:25:19 GMT",
"version": "v4"
},
{
"created": "Thu, 5 Feb 1998 11:07:02 GMT",
"version": "v5"
}
] |
2009-10-30
|
[
[
"Bertolini",
"S.",
""
],
[
"Eeg",
"J. O.",
""
],
[
"Fabbrichesi",
"M.",
""
],
[
"Lashin",
"E. I.",
""
]
] |
We calculate the hadronic matrix elements to $O(p^4)$ in the chiral expansion for the ($\Delta S =1$) $K^0 \to 2 \pi$ decays and the ($\Delta S=2$) $\bar K^0$-$K^0$ oscillation. This is done within the framework of the chiral quark model. The chiral coefficients thus determined depend on the values of the quark and gluon condensates and the constituent quark mass. We show that it is possible to fit the $\Delta I =1/2$ rule of kaon decays with values of the condensates close to those obtained by QCD sum rules. The renormalization invariant amplitudes are obtained by matching the hadronic matrix elements and their chiral corrections to the short-distance NLO Wilson coefficients. For the same input values, we study the parameter $\hat B_K$ of kaon oscillation and find $\hat B_K = 1.1 \pm 0.2$. As an independent check, we determine $\hat B_K$ from the experimental value of the $K_L$-$K_S$ mass difference by using our calculation of the long-distance contributions. The destructive interplay between the short- and long-distance amplitudes yields $\hat B_K = 1.2 \pm 0.1$, in agreement with the direct calculation.
|
1402.1031
|
Tim Ledwig
|
L. Alvarez-Ruso, T. Ledwig, J. Martin Camalich, M. J. Vicente Vacas
|
The nucleon mass and pion-nucleon sigma term from a chiral analysis of
Nf=2 lattice QCD world data
|
Contribution to the International Nuclear Physics Conference 2013, 4
pages, 4 figures
| null |
10.1142/S2010194514600891
| null |
hep-ph hep-lat
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the pion-mass dependence of the nucleon mass within the
covariant SU(2) baryon chiral perturbation theory up to order p4 with and
without explicit Delta(1232) degrees of freedom. We fit lattice QCD data from
several collaborations for 2 and 2+1 flavor ensembles. Here, we emphasize our
Nf=2 study where the inclusion the Delta(1232) contributions stabilizes the
fits. We correct for finite volume and spacing effects, set independently the
lattice QCD scale by a Sommer-scale of r0 = 0.493(23) fm and also include one
sigma pi-N lQCD data point near Mpi = 290 MeV. We obtain low-energy constants
of natural size which are compatible with the rather linear pion-mass
dependence observed in lattice QCD. We report a value of 41(5)(4) MeV for the
sigma pi-N term in the 2 flavor case and 52(3)(8) MeV in the 2+1 flavors case.
|
[
{
"created": "Wed, 5 Feb 2014 13:12:29 GMT",
"version": "v1"
}
] |
2015-06-18
|
[
[
"Alvarez-Ruso",
"L.",
""
],
[
"Ledwig",
"T.",
""
],
[
"Camalich",
"J. Martin",
""
],
[
"Vacas",
"M. J. Vicente",
""
]
] |
We investigate the pion-mass dependence of the nucleon mass within the covariant SU(2) baryon chiral perturbation theory up to order p4 with and without explicit Delta(1232) degrees of freedom. We fit lattice QCD data from several collaborations for 2 and 2+1 flavor ensembles. Here, we emphasize our Nf=2 study where the inclusion the Delta(1232) contributions stabilizes the fits. We correct for finite volume and spacing effects, set independently the lattice QCD scale by a Sommer-scale of r0 = 0.493(23) fm and also include one sigma pi-N lQCD data point near Mpi = 290 MeV. We obtain low-energy constants of natural size which are compatible with the rather linear pion-mass dependence observed in lattice QCD. We report a value of 41(5)(4) MeV for the sigma pi-N term in the 2 flavor case and 52(3)(8) MeV in the 2+1 flavors case.
|
hep-ph/9503404
|
Nikolai Uraltsev
|
N.G. Uraltsev
|
Do Higher Order Perturbative Corrections Upset |V_{cb}| and |V_{ub}|
Determined from Semileptonic Widths?
|
16 pages, no figures; to appear in IJMPA. SUMMARY of CHANGES made for
the journal version: 1. The Comment on the Luke's theorem is added as a
footnote after Eq.(18). 2. Misprint in sign is corrected in Eq.(18) 3.
Obvious misprint in the normalization of BR(b->u) in Eqs.(25), (27) is
eliminated; the results of numerical analysis of b->u are formulated in a
more precise way. Coefficients in Eqs.(19) and (20) changed insignificantly
due to using the normalization scale 1.3GeV instead of
|
Int.J.Mod.Phys.A11:515-532,1996
|
10.1142/S0217751X96000237
|
TPI-MINN-95/5-T, UMN-TH-1332-95
|
hep-ph
| null |
It is shown that large perturbative corrections found previously for
semileptonic beauty and charm decays are associated with using inappropriate
pole masses. The latter, in the perturbative expansion, suffer from the 1/m_Q
infrared renormalon which is absent in the widths, which leads to similar large
corrections in m_Q. Pole masses are neither measured directly in experiment. If
the widths are related to parameters determined in experiment, the overall
impact of the calculated second order corrections becomes strongly suppressed
and leads to less than 1\% change in |V_{cb}| and |V_{ub}|. Even in charm
decays the perturbative corrections appear to be very moderate in the
consistent OPE-compliant treatment. The updated estimate of |V_{cb}| is given,
based on recent accurate determination of m_b and \alpha_s(1 GeV). The
theoretical accuracy of determination of |V_{ub}| from \Gamma_{sl}(b->u)
appears to be good as well.
|
[
{
"created": "Wed, 22 Mar 1995 05:32:14 GMT",
"version": "v1"
},
{
"created": "Fri, 16 Jun 1995 14:33:05 GMT",
"version": "v2"
}
] |
2014-11-17
|
[
[
"Uraltsev",
"N. G.",
""
]
] |
It is shown that large perturbative corrections found previously for semileptonic beauty and charm decays are associated with using inappropriate pole masses. The latter, in the perturbative expansion, suffer from the 1/m_Q infrared renormalon which is absent in the widths, which leads to similar large corrections in m_Q. Pole masses are neither measured directly in experiment. If the widths are related to parameters determined in experiment, the overall impact of the calculated second order corrections becomes strongly suppressed and leads to less than 1\% change in |V_{cb}| and |V_{ub}|. Even in charm decays the perturbative corrections appear to be very moderate in the consistent OPE-compliant treatment. The updated estimate of |V_{cb}| is given, based on recent accurate determination of m_b and \alpha_s(1 GeV). The theoretical accuracy of determination of |V_{ub}| from \Gamma_{sl}(b->u) appears to be good as well.
|
2203.09713
|
Kai Murai
|
Masahiro Kawasaki, Kai Murai
|
Lepton Asymmetric Universe
|
12 pages, 1 figure
|
JCAP 08 (2022) 041
|
10.1088/1475-7516/2022/08/041
| null |
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The recent observation of $^4$He implies that our universe has a large lepton
asymmetry. We consider the Affleck-Dine (AD) mechanism for lepton number
generation. In the AD mechanism, non-topological solitons called L-balls are
produced, and the generated lepton number is confined in them. The L-balls
protect the generated lepton number from being converted to baryon number
through the sphaleron processes. We study the formation and evolution of the
L-balls and find that the universe with large lepton asymmetry suggested by the
recent $^4$He measurement can be realized.
|
[
{
"created": "Fri, 18 Mar 2022 03:17:29 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Nov 2022 05:46:49 GMT",
"version": "v2"
}
] |
2022-11-03
|
[
[
"Kawasaki",
"Masahiro",
""
],
[
"Murai",
"Kai",
""
]
] |
The recent observation of $^4$He implies that our universe has a large lepton asymmetry. We consider the Affleck-Dine (AD) mechanism for lepton number generation. In the AD mechanism, non-topological solitons called L-balls are produced, and the generated lepton number is confined in them. The L-balls protect the generated lepton number from being converted to baryon number through the sphaleron processes. We study the formation and evolution of the L-balls and find that the universe with large lepton asymmetry suggested by the recent $^4$He measurement can be realized.
|
2403.09783
|
Garv Chauhan
|
Garv Chauhan, Xun-Jie Xu
|
Impact of the cosmic neutrino background on long-range force searches
|
18 pages, 2 figures; version to appear in JHEP
| null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
Light bosons can mediate long-range forces. We show that light bosonic
mediators interacting with a background medium, in particular, with the cosmic
neutrino background (C$\nu$B), may induce medium-dependent masses which could
effectively screen long-range forces from detection. This leads to profound
implications for long-range force searches in e.g. the E\"ot-Wash, MICROSCOPE,
and lunar laser-ranging (LLR) experiments. For instance, we find that when the
coupling of the mediator to neutrinos is above $3\times10^{-10}$ or
$5\times10^{-13}$, bounds from LLR and experiments employing the Sun as an
attractor, respectively, would be entirely eliminated. Larger values of the
coupling can also substantially alleviate bounds from searches conducted at
shorter distances.
|
[
{
"created": "Thu, 14 Mar 2024 18:05:12 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Jul 2024 04:52:03 GMT",
"version": "v2"
}
] |
2024-07-26
|
[
[
"Chauhan",
"Garv",
""
],
[
"Xu",
"Xun-Jie",
""
]
] |
Light bosons can mediate long-range forces. We show that light bosonic mediators interacting with a background medium, in particular, with the cosmic neutrino background (C$\nu$B), may induce medium-dependent masses which could effectively screen long-range forces from detection. This leads to profound implications for long-range force searches in e.g. the E\"ot-Wash, MICROSCOPE, and lunar laser-ranging (LLR) experiments. For instance, we find that when the coupling of the mediator to neutrinos is above $3\times10^{-10}$ or $5\times10^{-13}$, bounds from LLR and experiments employing the Sun as an attractor, respectively, would be entirely eliminated. Larger values of the coupling can also substantially alleviate bounds from searches conducted at shorter distances.
|
hep-ph/0111016
|
R. Sekhar Chivukula
|
R. Sekhar Chivukula, Duane A. Dicus, and Hong-Jian He
|
Unitarity of Compactified Five Dimensional Yang-Mills Theory
|
10 pages, 1 eps figure, discussion of deconstruction expanded,
version accepted for publication in PLB
|
Phys.Lett.B525:175-182,2002
|
10.1016/S0370-2693(01)01435-6
|
BUHEP-01-27 and UTHEP-01-25
|
hep-ph hep-th
| null |
Compactified five dimensional Yang-Mills theory results in an effective
four-dimensional theory with a Kaluza-Klein (KK) tower of massive vector
bosons. We explicitly demonstrate that the scattering of the massive vector
bosons is unitary at tree-level for low energies, and analyze the relationship
between the unitarity violation scale in the KK theory and the
nonrenormalizability scale in the five dimensional gauge theory. In the
compactified theory, low-energy unitarity is ensured through an interlacing
cancellation among contributions from the relevant KK levels. Such
cancellations can be understood using a Kaluza-Klein equivalence theorem which
results from the geometric ``Higgs'' mechanism of compactification. In these
theories, the unitarity violation is delayed to energy scales higher than the
customary limit through the introduction of additional vector bosons rather
than Higgs scalars.
|
[
{
"created": "Thu, 1 Nov 2001 18:51:59 GMT",
"version": "v1"
},
{
"created": "Sun, 4 Nov 2001 18:39:03 GMT",
"version": "v2"
},
{
"created": "Wed, 5 Dec 2001 12:08:44 GMT",
"version": "v3"
}
] |
2008-11-26
|
[
[
"Chivukula",
"R. Sekhar",
""
],
[
"Dicus",
"Duane A.",
""
],
[
"He",
"Hong-Jian",
""
]
] |
Compactified five dimensional Yang-Mills theory results in an effective four-dimensional theory with a Kaluza-Klein (KK) tower of massive vector bosons. We explicitly demonstrate that the scattering of the massive vector bosons is unitary at tree-level for low energies, and analyze the relationship between the unitarity violation scale in the KK theory and the nonrenormalizability scale in the five dimensional gauge theory. In the compactified theory, low-energy unitarity is ensured through an interlacing cancellation among contributions from the relevant KK levels. Such cancellations can be understood using a Kaluza-Klein equivalence theorem which results from the geometric ``Higgs'' mechanism of compactification. In these theories, the unitarity violation is delayed to energy scales higher than the customary limit through the introduction of additional vector bosons rather than Higgs scalars.
|
2202.02730
|
Tao Zhong
|
Yi Zhang, Tao Zhong, Hai-Bing Fu, Wei Cheng, Long Zeng and Xing-Gang
Wu
|
The ratio $\mathcal{R}(D_s)$ for $B_s \to D_s \ell\nu_\ell$ by using the
QCD light-cone sum rules within the framework of heavy quark effective field
theory
|
9 pages, 7 figures
| null |
10.1103/PhysRevD.105.096013
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
In the paper, we study the $B_s\to D_s$ transition form factors by using the
light-cone sum rules within the framework of heavy quark effective field
theory. We adopt a chiral current correlation function to do the calculation,
the resultant transition form factors $f_+^{B_s\to D_s}(q^2)$ and $f_0^{B_s\to
D_s}(q^2)$ are dominated by the contribution of $D_s$-meson leading-twist
distribution amplitude, while the contributions from less certain $D_s$-meson
twist-3 distribution amplitudes are greatly suppressed. At the largest recoil
point, we obtain $f_{+,0}^{B_s \to D_s}(0)=0.533^{+0.112}_{-0.094}$. By further
extrapolating the transition form factors into all the physically allowable
$q^2$ region with the help of the $z$-series parametrization approach, we
calculate the branching fractions $\mathcal{B}(B_s \to D_s \ell^\prime
\nu_{\ell^\prime})$ with $(\ell^\prime= e,\mu)$ and $\mathcal{B}(B_s \to D_s
\tau \nu_\tau)$, which gives $\mathcal{R}(D_s)=0.334\pm 0.017$.
|
[
{
"created": "Sun, 6 Feb 2022 08:24:59 GMT",
"version": "v1"
}
] |
2022-05-25
|
[
[
"Zhang",
"Yi",
""
],
[
"Zhong",
"Tao",
""
],
[
"Fu",
"Hai-Bing",
""
],
[
"Cheng",
"Wei",
""
],
[
"Zeng",
"Long",
""
],
[
"Wu",
"Xing-Gang",
""
]
] |
In the paper, we study the $B_s\to D_s$ transition form factors by using the light-cone sum rules within the framework of heavy quark effective field theory. We adopt a chiral current correlation function to do the calculation, the resultant transition form factors $f_+^{B_s\to D_s}(q^2)$ and $f_0^{B_s\to D_s}(q^2)$ are dominated by the contribution of $D_s$-meson leading-twist distribution amplitude, while the contributions from less certain $D_s$-meson twist-3 distribution amplitudes are greatly suppressed. At the largest recoil point, we obtain $f_{+,0}^{B_s \to D_s}(0)=0.533^{+0.112}_{-0.094}$. By further extrapolating the transition form factors into all the physically allowable $q^2$ region with the help of the $z$-series parametrization approach, we calculate the branching fractions $\mathcal{B}(B_s \to D_s \ell^\prime \nu_{\ell^\prime})$ with $(\ell^\prime= e,\mu)$ and $\mathcal{B}(B_s \to D_s \tau \nu_\tau)$, which gives $\mathcal{R}(D_s)=0.334\pm 0.017$.
|
0903.1683
|
Pankaj Jain
|
Pankaj Jain and Subhadip Mitra
|
Standard Model with Cosmologically Broken Quantum Scale Invariance
|
13 pages, no figures significant revisions, no change in results or
conclusions
|
Mod.Phys.Lett.A25:167-177,2010
|
10.1142/S0217732310032317
| null |
hep-ph astro-ph.CO hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We argue that scale invariance is not anomalous in quantum field theory,
provided it is broken cosmologically. We consider a locally scale invariant
extension of the Standard Model of particle physics and argue that it fits both
the particle and cosmological observations. The model is scale invariant both
classically and quantum mechanically. The scale invariance is broken
cosmologically producing all the dimensionful parameters. The cosmological
constant or dark energy is a prediction of the theory and can be calculated
systematically order by order in perturbation theory. It is expected to be
finite at all orders. The model does not suffer from the hierarchy problem due
to absence of scalar particles, including the Higgs, from the physical
spectrum.
|
[
{
"created": "Tue, 10 Mar 2009 05:00:45 GMT",
"version": "v1"
},
{
"created": "Fri, 22 May 2009 04:19:45 GMT",
"version": "v2"
}
] |
2010-08-19
|
[
[
"Jain",
"Pankaj",
""
],
[
"Mitra",
"Subhadip",
""
]
] |
We argue that scale invariance is not anomalous in quantum field theory, provided it is broken cosmologically. We consider a locally scale invariant extension of the Standard Model of particle physics and argue that it fits both the particle and cosmological observations. The model is scale invariant both classically and quantum mechanically. The scale invariance is broken cosmologically producing all the dimensionful parameters. The cosmological constant or dark energy is a prediction of the theory and can be calculated systematically order by order in perturbation theory. It is expected to be finite at all orders. The model does not suffer from the hierarchy problem due to absence of scalar particles, including the Higgs, from the physical spectrum.
|
1810.07704
|
Teng Ma
|
Csaba Cs\'aki, Teng Ma, Jing Shu, Jiang-Hao Yu
|
Emergence of Maximal Symmetry
|
9 pages + appendices, 5 figures
|
Phys. Rev. Lett. 124, 241801 (2020)
|
10.1103/PhysRevLett.124.241801
| null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
An emergent global symmetry of the composite sector (called maximal symmetry)
can soften the ultraviolet behavior of the Higgs potential and also
significantly modify its structure. We explain the conditions for the emergence
of maximal symmetry as well as its main consequences. We present two simple
implementations and generalize both to N-site as well as full warped extra
dimensional models. The gauge symmetry of these models enforces the emergence
of maximal symmetry. The corresponding Higgs potentials have unique properties:
one case minimizes the tuning while the other allows heavy top partners evading
direct LHC bounds.
|
[
{
"created": "Wed, 17 Oct 2018 18:00:09 GMT",
"version": "v1"
}
] |
2020-07-01
|
[
[
"Csáki",
"Csaba",
""
],
[
"Ma",
"Teng",
""
],
[
"Shu",
"Jing",
""
],
[
"Yu",
"Jiang-Hao",
""
]
] |
An emergent global symmetry of the composite sector (called maximal symmetry) can soften the ultraviolet behavior of the Higgs potential and also significantly modify its structure. We explain the conditions for the emergence of maximal symmetry as well as its main consequences. We present two simple implementations and generalize both to N-site as well as full warped extra dimensional models. The gauge symmetry of these models enforces the emergence of maximal symmetry. The corresponding Higgs potentials have unique properties: one case minimizes the tuning while the other allows heavy top partners evading direct LHC bounds.
|
1408.1040
|
Alexander Titov I.
|
Alexander I. Titov, Burkhard Kampfer, Takuya Shibata, Atsushi Hosaka,
and Hideaki Takabe
|
Laser pulse-shape dependence of Compton scattering
|
14 pages, 12 figures
| null |
10.1140/epjd/e2014-50324-y
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Compton scattering of short and ultra short (sub-cycle) laser pulses off
mildly relativistic electrons is considered within a QED framework. The
temporal shape of the pulse is essential for the differential cross section as
a function of the energy of the scattered photon at fixed observation angle.
The partly integrated cross section is sensitive to the non-linear dynamics
resulting in a large enhancement of the cross section for short and, in
particular, for ultra-short flat-top pulse envelopes which can reach several
orders of magnitude, as compared with the case of a long pulse. Such effects
can be studied experimentally and must be taken into account in
Monte-Carlo/transport simulations of %$e^+e^-$ pair production in the
interaction of electrons and photons in a strong laser field.
|
[
{
"created": "Tue, 5 Aug 2014 17:28:41 GMT",
"version": "v1"
}
] |
2015-06-22
|
[
[
"Titov",
"Alexander I.",
""
],
[
"Kampfer",
"Burkhard",
""
],
[
"Shibata",
"Takuya",
""
],
[
"Hosaka",
"Atsushi",
""
],
[
"Takabe",
"Hideaki",
""
]
] |
Compton scattering of short and ultra short (sub-cycle) laser pulses off mildly relativistic electrons is considered within a QED framework. The temporal shape of the pulse is essential for the differential cross section as a function of the energy of the scattered photon at fixed observation angle. The partly integrated cross section is sensitive to the non-linear dynamics resulting in a large enhancement of the cross section for short and, in particular, for ultra-short flat-top pulse envelopes which can reach several orders of magnitude, as compared with the case of a long pulse. Such effects can be studied experimentally and must be taken into account in Monte-Carlo/transport simulations of %$e^+e^-$ pair production in the interaction of electrons and photons in a strong laser field.
|
hep-ph/9305282
|
Peter White
|
T.Elliott, S.F.King, P.L.White
|
Squark Contributions to Higgs Boson Masses in the Next--to--Minimal
Supersymmetric Standard Model
|
14 pages plus one postscript figure available separately;
SHEP-92/93-18
|
Phys.Lett. B314 (1993) 56-63
|
10.1016/0370-2693(93)91321-D
| null |
hep-ph
| null |
Within the context of an effective potential formalism we calculate the
contribution to Higgs boson masses in the next--to--minimal supersymmetric
standard model from squark loops. We then supplement a previously performed
renormalisation group analysis of the Higgs sector of this model with these
results in order to determine the shift in the bound on the lightest CP-even
Higgs boson mass as a result of squark effects. The improved bound on the
lightest neutral CP-even Higgs boson mass, including squark contributions, is
$m_h \leq 146 \ \ (139, 149)$ GeV for $m_t = 90 \ \ (140, 190)$ GeV. For $m_t =
190$ GeV squark effects contribute 23 GeV to the bound, with smaller
contributions for small $m_t$ values.
|
[
{
"created": "Tue, 18 May 1993 18:16:08 GMT",
"version": "v1"
}
] |
2009-10-22
|
[
[
"Elliott",
"T.",
""
],
[
"King",
"S. F.",
""
],
[
"White",
"P. L.",
""
]
] |
Within the context of an effective potential formalism we calculate the contribution to Higgs boson masses in the next--to--minimal supersymmetric standard model from squark loops. We then supplement a previously performed renormalisation group analysis of the Higgs sector of this model with these results in order to determine the shift in the bound on the lightest CP-even Higgs boson mass as a result of squark effects. The improved bound on the lightest neutral CP-even Higgs boson mass, including squark contributions, is $m_h \leq 146 \ \ (139, 149)$ GeV for $m_t = 90 \ \ (140, 190)$ GeV. For $m_t = 190$ GeV squark effects contribute 23 GeV to the bound, with smaller contributions for small $m_t$ values.
|
1902.05022
|
Francesco Murgia
|
M. Anselmino, M. Boglione, U. D'Alesio, F. Murgia, A. Prokudin
|
Unpolarised TMD PDFs and FFs and the role of transverse momentum
dependence in azimuthal spin asymmetries
|
9 pages, 2 figures (4 eps plots); Talk delivered by F. Murgia at the
"23rd International Spin Symposium (SPIN 2018)", Ferrara, Italy, September
10-14, 2018; To appear in Proceedings of Science
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In the TMD approach, the average transverse momentum of the unpolarised TMD
PDFs and FFs is crucial not only to reproduce unpolarised cross sections and
hadron multiplicities, but also for the understanding of azimuthal and spin
asymmetries. Information on these transverse momenta is nowadays obtained
mainly by fitting multiplicities data for SIDIS, where the intrinsic motion in
the initial parton distributions and in the hadronisation process are strongly
correlated and difficult to estimate separately without ambiguities. In this
contribution we discuss the consequences of this correlation effects on the
predictions for the Sivers and Collins asymmetries measured in SIDIS and
$e^+e^-$ annihilations, and under active investigation for Drell-Yan processes
at RHIC and at CERN by the COMPASS experiment. We show that these effects may
be relevant and can sensibly modify the size of the predicted asymmetries.
Therefore, they must be taken into careful account when investigating other
aspects of TMDs, like the evolution properties of the Sivers and Collins
functions and the expected process dependence of the Sivers function.
|
[
{
"created": "Wed, 13 Feb 2019 17:31:16 GMT",
"version": "v1"
}
] |
2019-02-14
|
[
[
"Anselmino",
"M.",
""
],
[
"Boglione",
"M.",
""
],
[
"D'Alesio",
"U.",
""
],
[
"Murgia",
"F.",
""
],
[
"Prokudin",
"A.",
""
]
] |
In the TMD approach, the average transverse momentum of the unpolarised TMD PDFs and FFs is crucial not only to reproduce unpolarised cross sections and hadron multiplicities, but also for the understanding of azimuthal and spin asymmetries. Information on these transverse momenta is nowadays obtained mainly by fitting multiplicities data for SIDIS, where the intrinsic motion in the initial parton distributions and in the hadronisation process are strongly correlated and difficult to estimate separately without ambiguities. In this contribution we discuss the consequences of this correlation effects on the predictions for the Sivers and Collins asymmetries measured in SIDIS and $e^+e^-$ annihilations, and under active investigation for Drell-Yan processes at RHIC and at CERN by the COMPASS experiment. We show that these effects may be relevant and can sensibly modify the size of the predicted asymmetries. Therefore, they must be taken into careful account when investigating other aspects of TMDs, like the evolution properties of the Sivers and Collins functions and the expected process dependence of the Sivers function.
|
1306.6837
|
Antoni Szczurek
|
Antoni Szczurek and Rafal Maciula
|
Production of two $c \bar c$ pairs in double-parton scattering within
$k_t$-factorization
|
7 pages, 6 figures, presented by A. Szczurek at DIS2013, Marseille,
22-26.04.2013
| null | null | null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss production of two pairs of $c \bar c$ in proton-proton collisions
at the LHC. Both double-parton scattering (DPS) and single-parton scattering
(SPS) contributions are included in the analysis. Each step of DPS is
calculated within $k_t$-factorization approach. The conditions how to identify
the DPS contribution are presented. The discussed mechanism leads to the
production of pairs of mesons: each containing $c$ quarks or each containing
$\bar c$ antiquarks. We discuss corresponding production rates and some
differential distributions for $(D^0 D^0$ + $\bar D^0 \bar D^0)$ production.
Within large theoretical uncertainties the predicted DPS cross section is
fairly similar to the cross section measured recently by the LHCb
collaboration. The best description is obtained with the Kimber-Martin-Ryskin
(KMR) unintegrated gluon distribution. The contribution of SPS, calculated in
the high-energy approximation, turned out to be rather small. Finally, we
emphasize significant contribution of DPS mechanism to inclusive charmed meson
spectra measured recently by ALICE, ATLAS and LHCb.
|
[
{
"created": "Fri, 28 Jun 2013 13:40:11 GMT",
"version": "v1"
}
] |
2013-07-01
|
[
[
"Szczurek",
"Antoni",
""
],
[
"Maciula",
"Rafal",
""
]
] |
We discuss production of two pairs of $c \bar c$ in proton-proton collisions at the LHC. Both double-parton scattering (DPS) and single-parton scattering (SPS) contributions are included in the analysis. Each step of DPS is calculated within $k_t$-factorization approach. The conditions how to identify the DPS contribution are presented. The discussed mechanism leads to the production of pairs of mesons: each containing $c$ quarks or each containing $\bar c$ antiquarks. We discuss corresponding production rates and some differential distributions for $(D^0 D^0$ + $\bar D^0 \bar D^0)$ production. Within large theoretical uncertainties the predicted DPS cross section is fairly similar to the cross section measured recently by the LHCb collaboration. The best description is obtained with the Kimber-Martin-Ryskin (KMR) unintegrated gluon distribution. The contribution of SPS, calculated in the high-energy approximation, turned out to be rather small. Finally, we emphasize significant contribution of DPS mechanism to inclusive charmed meson spectra measured recently by ALICE, ATLAS and LHCb.
|
2001.11041
|
Vicent Mateu
|
Diogo Boito and Vicent Mateu
|
Precise determination of $\alpha_s$ from relativistic quarkonium sum
rules
|
35 pages, 6 figures. v2: added one reference, matches version
published on JHEP
| null |
10.1007/JHEP03(2020)094
|
IFT-UAM/CSIC-19-164
|
hep-ph hep-lat
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We determine the strong coupling $\alpha_s(m_Z)$ from dimensionless ratios of
roots of moments of the charm- and bottom-quark vector and charm pseudo-scalar
correlators, dubbed
$R_q^{X,n}\equiv(M_q^{X,n})^\frac{1}{n}/(M_q^{X,n+1})^\frac{1}{n+1}$, with
$X=V,P$, as well as from the $0$-th moment of the charm pseudo-scalar
correlator, $M_c^{P,0}$. In the quantities we use, the mass dependence is very
weak, entering only logarithmically, starting at $\mathcal{O}(\alpha_s^2)$. We
carefully study all sources of uncertainties, paying special attention to
truncation errors, and making sure that order-by-order convergence is
maintained by our choice of renormalization scale variation. In the computation
of the experimental uncertainty for the moment ratios, the correlations among
individual moments are properly taken into account. Additionally, in the
perturbative contributions to experimental vector-current moments,
$\alpha_s(m_Z)$ is kept as a free parameter such that our extraction of the
strong coupling is unbiased and based only on experimental data. The most
precise extraction of $\alpha_s$ from vector correlators comes from the ratio
of the charm-quark moments $R_c^{V,2}$ and reads $\alpha_s(m_Z)=0.1168\pm
0.0019$, as we have recently discussed in a companion letter. From bottom
moments, using the ratio $R_b^{V,2}$, we find $\alpha_s(m_Z)=0.1186\pm0.0048$.
Our results from the lattice pseudo-scalar charm correlator agree with the
central values of previous determinations, but have larger uncertainties due to
our more conservative study of the perturbative error. Averaging the results
obtained from various lattice inputs for the $n=0$ moment we find
$\alpha_s(m_Z)=0.1177\pm0.0020$. Combining experimental and lattice information
on charm correlators into a single fit we obtain $\alpha_s(m_Z)=0.1170\pm
0.0014$, which is the main result of this article.
|
[
{
"created": "Wed, 29 Jan 2020 19:00:12 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Mar 2020 12:30:10 GMT",
"version": "v2"
}
] |
2020-04-22
|
[
[
"Boito",
"Diogo",
""
],
[
"Mateu",
"Vicent",
""
]
] |
We determine the strong coupling $\alpha_s(m_Z)$ from dimensionless ratios of roots of moments of the charm- and bottom-quark vector and charm pseudo-scalar correlators, dubbed $R_q^{X,n}\equiv(M_q^{X,n})^\frac{1}{n}/(M_q^{X,n+1})^\frac{1}{n+1}$, with $X=V,P$, as well as from the $0$-th moment of the charm pseudo-scalar correlator, $M_c^{P,0}$. In the quantities we use, the mass dependence is very weak, entering only logarithmically, starting at $\mathcal{O}(\alpha_s^2)$. We carefully study all sources of uncertainties, paying special attention to truncation errors, and making sure that order-by-order convergence is maintained by our choice of renormalization scale variation. In the computation of the experimental uncertainty for the moment ratios, the correlations among individual moments are properly taken into account. Additionally, in the perturbative contributions to experimental vector-current moments, $\alpha_s(m_Z)$ is kept as a free parameter such that our extraction of the strong coupling is unbiased and based only on experimental data. The most precise extraction of $\alpha_s$ from vector correlators comes from the ratio of the charm-quark moments $R_c^{V,2}$ and reads $\alpha_s(m_Z)=0.1168\pm 0.0019$, as we have recently discussed in a companion letter. From bottom moments, using the ratio $R_b^{V,2}$, we find $\alpha_s(m_Z)=0.1186\pm0.0048$. Our results from the lattice pseudo-scalar charm correlator agree with the central values of previous determinations, but have larger uncertainties due to our more conservative study of the perturbative error. Averaging the results obtained from various lattice inputs for the $n=0$ moment we find $\alpha_s(m_Z)=0.1177\pm0.0020$. Combining experimental and lattice information on charm correlators into a single fit we obtain $\alpha_s(m_Z)=0.1170\pm 0.0014$, which is the main result of this article.
|
hep-ph/9802314
| null |
Carl H. Albright (Northern Illinois Univ., Fermi National Accelerator
Laboratory), K.S. Babu (Inst. for Advanced Study), S.M. Barr (Bartol Research
Inst.)
|
A Minimality Condition and Atmospheric Neutrino Oscillations
|
11 pages, LaTeX
|
Phys.Rev.Lett.81:1167-1170,1998
|
10.1103/PhysRevLett.81.1167
|
FERMILAB-Pub-98/052-T, IASSNS-HEP-98-14, BA-98-06
|
hep-ph
| null |
A structure is proposed for the mass matrices of the quarks and leptons that
arises in a natural way from the assumption that the breaking of SO(10) gauge
symmetry is achieved by the smallest possible set of vacuum expectation values.
This structure explains well many features of the observed spectrum of quarks
and leptons. It reproduces the Georgi-Jarlskog mass relations and postdicts the
charm quark mass in reasonable agreement with data. It also predicts a large
mixing angle between \nu_{\mu} and \nu_{\tau}, as suggested by atmospheric
neutrino data. The mixing angles of the electron neutrino are predicted to be
small.
|
[
{
"created": "Thu, 12 Feb 1998 22:35:57 GMT",
"version": "v1"
}
] |
2011-05-12
|
[
[
"Albright",
"Carl H.",
"",
"Northern Illinois Univ., Fermi National Accelerator\n Laboratory"
],
[
"Babu",
"K. S.",
"",
"Inst. for Advanced Study"
],
[
"Barr",
"S. M.",
"",
"Bartol Research\n Inst."
]
] |
A structure is proposed for the mass matrices of the quarks and leptons that arises in a natural way from the assumption that the breaking of SO(10) gauge symmetry is achieved by the smallest possible set of vacuum expectation values. This structure explains well many features of the observed spectrum of quarks and leptons. It reproduces the Georgi-Jarlskog mass relations and postdicts the charm quark mass in reasonable agreement with data. It also predicts a large mixing angle between \nu_{\mu} and \nu_{\tau}, as suggested by atmospheric neutrino data. The mixing angles of the electron neutrino are predicted to be small.
|
hep-ph/9810383
|
Papadopoulos Costas
|
N.G. Antoniou, Y.F. Contoyiannis, F.K. Diakonos and C.G. Papadopoulos
|
Fractals at T=Tc due to instanton-like configurations
|
To appear in Physical Review Letters
|
Phys.Rev.Lett. 81 (1998) 4289-4292
|
10.1103/PhysRevLett.81.4289
| null |
hep-ph
| null |
We investigate the geometry of the critical fluctuations for a general system
undergoing a thermal second order phase transition. Adopting a generalized
effective action for the local description of the fluctuations of the order
parameter at the critical point ($T=T_c$) we show that instanton-like
configurations, corresponding to the minima of the effective action functional,
build up clusters with fractal geometry characterizing locally the critical
fluctuations. The connection between the corresponding (local) fractal
dimension and the critical exponents is derived. Possible extension of the
local geometry of the system to a global picture is also discussed.
|
[
{
"created": "Fri, 16 Oct 1998 12:44:20 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Antoniou",
"N. G.",
""
],
[
"Contoyiannis",
"Y. F.",
""
],
[
"Diakonos",
"F. K.",
""
],
[
"Papadopoulos",
"C. G.",
""
]
] |
We investigate the geometry of the critical fluctuations for a general system undergoing a thermal second order phase transition. Adopting a generalized effective action for the local description of the fluctuations of the order parameter at the critical point ($T=T_c$) we show that instanton-like configurations, corresponding to the minima of the effective action functional, build up clusters with fractal geometry characterizing locally the critical fluctuations. The connection between the corresponding (local) fractal dimension and the critical exponents is derived. Possible extension of the local geometry of the system to a global picture is also discussed.
|
hep-ph/9508231
|
Toshiyuki Morii
|
T. Morii, S. Tanaka and T. Yamanishi
|
Polarized Gluons in the Nucleon
|
LaTeX file, 9 pages+4 figures not included (available upon request),
Talk presented at the Workshop on GeV Scale Physics as a Probe into New
Physics, Toyama(Japan), 26-28 June, 1995
| null | null |
KOBE-FHD-95-05
|
hep-ph
| null |
QCD suggests that gluons in the nucleon play an important role in {\it
so-called} ``the proton spin problem''. In this talk, the behavior of the
polarized gluon distribution in the nucleon is discussed by using the
positivity condition of distribution functions together with the unpolarized
and polarized experimental data.
|
[
{
"created": "Fri, 4 Aug 1995 08:44:08 GMT",
"version": "v1"
}
] |
2009-09-25
|
[
[
"Morii",
"T.",
""
],
[
"Tanaka",
"S.",
""
],
[
"Yamanishi",
"T.",
""
]
] |
QCD suggests that gluons in the nucleon play an important role in {\it so-called} ``the proton spin problem''. In this talk, the behavior of the polarized gluon distribution in the nucleon is discussed by using the positivity condition of distribution functions together with the unpolarized and polarized experimental data.
|
2305.10689
|
Ibuki Terashima
|
Ibuki Terashima, Tetsuo Hyodo
|
Hadron-hadron potentials coupled to quark degrees of freedom for exotic
hadrons
|
12 pages, 9 figures
|
Physical Review C 108, 035204 (2023)
|
10.1103/PhysRevC.108.035204
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the properties of the hadron-hadron potentials and quark-antiquark
potentials from the viewpoint of the channel coupling. We demonstrate that, for
finite quark masses, the coupling to the two-hadron continuum induces the
imaginary part of the quark-antiquark potential, in contrast to the
string-breaking phenomena in the static limit. It is also shown that the
elimination of the different degrees of freedom induces the nonlocality and
energy dependence of the effective potentials. For the obtained nonlocal
potentials, we apply two methods of the local approximation proposed
previously, the formal derivative expansion and the derivative expansion in the
HAL QCD method, by carefully examining the energy dependence of the potential.
As an application, we construct a coupled-channel model of $c\bar{c}$ and
$D^{0}\bar{D}^{*0}$ to describe $X(3872)$, and discuss the property of the
effective $D^{0}\bar{D}^{*0}$ potentials. We confirm that the local
approximation by the HAL QCD method works better than the formal derivative
expansion also for the energy-dependent potential. At the same time, we show
that, in the HAL QCD method, the resulting phase shift is sensitive to the
choice of the wavefunction to construct the local potential when the system has
a shallow bound state such as $X(3872)$.
|
[
{
"created": "Thu, 18 May 2023 03:59:43 GMT",
"version": "v1"
},
{
"created": "Sun, 1 Oct 2023 20:35:40 GMT",
"version": "v2"
}
] |
2023-10-03
|
[
[
"Terashima",
"Ibuki",
""
],
[
"Hyodo",
"Tetsuo",
""
]
] |
We study the properties of the hadron-hadron potentials and quark-antiquark potentials from the viewpoint of the channel coupling. We demonstrate that, for finite quark masses, the coupling to the two-hadron continuum induces the imaginary part of the quark-antiquark potential, in contrast to the string-breaking phenomena in the static limit. It is also shown that the elimination of the different degrees of freedom induces the nonlocality and energy dependence of the effective potentials. For the obtained nonlocal potentials, we apply two methods of the local approximation proposed previously, the formal derivative expansion and the derivative expansion in the HAL QCD method, by carefully examining the energy dependence of the potential. As an application, we construct a coupled-channel model of $c\bar{c}$ and $D^{0}\bar{D}^{*0}$ to describe $X(3872)$, and discuss the property of the effective $D^{0}\bar{D}^{*0}$ potentials. We confirm that the local approximation by the HAL QCD method works better than the formal derivative expansion also for the energy-dependent potential. At the same time, we show that, in the HAL QCD method, the resulting phase shift is sensitive to the choice of the wavefunction to construct the local potential when the system has a shallow bound state such as $X(3872)$.
|
1507.02064
|
P\'eter Kov\'acs Dr.
|
P\'eter Kov\'acs and Gy\"orgy Wolf
|
Chiral phase transition scenarios from the vector meson extended
Polyakov quark meson model
|
6 pages, 2 figures, Presented at Excited QCD 2015 (8-14 March 2015,
Tatranska Lomnica, Slovakia)
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Chiral phase transition is investigated in an $SU(3)_L \times SU(3)_R$
symmetric vector meson extended linear sigma model with additional constituent
quarks and Polyakov loops (extended Polyakov quark meson model). The
parameterization of the Lagrangian is done at zero temperature in a hybrid
approach, where the mesons are treated at tree-level, while the constituent
quarks at 1-loop level. The temperature and baryochemical potential dependence
of the two assumed scalar condensates are calculated from the hybrid 1-loop
level equations of states. The order of the phase transition along the $T=0$
and $\mu_B=0$ axes are determined for various parameterization scenarios. We
find that in order to have a first order phase transition at $T=0$ as a
function of $\mu_B$ a light isoscalar particle is needed.
|
[
{
"created": "Wed, 8 Jul 2015 08:33:15 GMT",
"version": "v1"
}
] |
2015-07-09
|
[
[
"Kovács",
"Péter",
""
],
[
"Wolf",
"György",
""
]
] |
Chiral phase transition is investigated in an $SU(3)_L \times SU(3)_R$ symmetric vector meson extended linear sigma model with additional constituent quarks and Polyakov loops (extended Polyakov quark meson model). The parameterization of the Lagrangian is done at zero temperature in a hybrid approach, where the mesons are treated at tree-level, while the constituent quarks at 1-loop level. The temperature and baryochemical potential dependence of the two assumed scalar condensates are calculated from the hybrid 1-loop level equations of states. The order of the phase transition along the $T=0$ and $\mu_B=0$ axes are determined for various parameterization scenarios. We find that in order to have a first order phase transition at $T=0$ as a function of $\mu_B$ a light isoscalar particle is needed.
|
1301.7670
|
Graham Moir
|
Graham Moir, Michael Peardon, Sinead M. Ryan, Christopher E. Thomas,
Liuming Liu
|
Excited spectroscopy of charmed mesons from lattice QCD
|
26 pages, 10 figures
|
JHEP 05 (2013) 021
|
10.1007/JHEP05(2013)021
|
TCDMATH 13-01
|
hep-ph hep-lat
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present spectra of highly excited D and Ds mesons up to around 3.8 GeV
determined using dynamical lattice QCD. We employ novel computational
techniques and the variational method with a large basis of carefully
constructed operators in order to extract and reliably identify the continuum
spin of an extensive set of excited states. These include states with high spin
and states identified as having an explicit gluonic contribution. Calculations
were performed on two volumes, both with a pion mass of approximately 400 MeV,
achieving a high statistical precision for both ground and excited states. We
discuss our results in light of experimental observations, comment on the
phenomenological implications and identify the lightest `supermultiplet' of
hybrid mesons in each sector.
|
[
{
"created": "Thu, 31 Jan 2013 16:25:06 GMT",
"version": "v1"
},
{
"created": "Wed, 15 May 2013 12:48:03 GMT",
"version": "v2"
},
{
"created": "Thu, 16 May 2013 10:13:53 GMT",
"version": "v3"
}
] |
2013-05-17
|
[
[
"Moir",
"Graham",
""
],
[
"Peardon",
"Michael",
""
],
[
"Ryan",
"Sinead M.",
""
],
[
"Thomas",
"Christopher E.",
""
],
[
"Liu",
"Liuming",
""
]
] |
We present spectra of highly excited D and Ds mesons up to around 3.8 GeV determined using dynamical lattice QCD. We employ novel computational techniques and the variational method with a large basis of carefully constructed operators in order to extract and reliably identify the continuum spin of an extensive set of excited states. These include states with high spin and states identified as having an explicit gluonic contribution. Calculations were performed on two volumes, both with a pion mass of approximately 400 MeV, achieving a high statistical precision for both ground and excited states. We discuss our results in light of experimental observations, comment on the phenomenological implications and identify the lightest `supermultiplet' of hybrid mesons in each sector.
|
hep-ph/0301186
|
Cristina Volpe
|
D. Koudela (University of Heidelberg) and C. Volpe (Institut de
Physique Nucleaire Orsay and University of Heidelberg)
|
Charmonium production in relativistic proton-nucleus collisions : What
will we learn from the negative x_F region ?
|
5 pages, LaTex file, 6 eps figures. submitted to Phys.Rev.Lett
|
Phys.Rev. C69 (2004) 054904
|
10.1103/PhysRevC.69.054904
| null |
hep-ph nucl-th
| null |
We study the nuclear medium effects on the $c\bar{c}$ time evolution and
charmonium production, in a relativistic proton-nucleus collision. In
particular, we focus on the fragmentation region of the nucleus where the
formation length of the charmonium mesons is shorter than the size of the
nucleus. Little is known on the nuclear effects in this region. We use a
quantum-mechanical model which includes a realistic potential for the
$c\bar{c}$ system and an imaginary potential to describe the collisions of the
$c\bar{c}$ with the nucleons. The imaginary potential introduces a transition
amplitude among the charmonium states and produces an interference pattern on
the charmonium survival probability, which is particulartly important for
$\psi'$. Our results on the suppression factors are compared with data from the
NA50 and E866/NuSea Collaborations. Predictions are given for the suppression
of $J/\psi,~\psi',~\chi_c$ as a function of the nuclear mass and in the
negative $x_F$ region, where data will be available soon.
|
[
{
"created": "Wed, 22 Jan 2003 19:29:58 GMT",
"version": "v1"
}
] |
2009-11-10
|
[
[
"Koudela",
"D.",
"",
"University of Heidelberg"
],
[
"Volpe",
"C.",
"",
"Institut de\n Physique Nucleaire Orsay and University of Heidelberg"
]
] |
We study the nuclear medium effects on the $c\bar{c}$ time evolution and charmonium production, in a relativistic proton-nucleus collision. In particular, we focus on the fragmentation region of the nucleus where the formation length of the charmonium mesons is shorter than the size of the nucleus. Little is known on the nuclear effects in this region. We use a quantum-mechanical model which includes a realistic potential for the $c\bar{c}$ system and an imaginary potential to describe the collisions of the $c\bar{c}$ with the nucleons. The imaginary potential introduces a transition amplitude among the charmonium states and produces an interference pattern on the charmonium survival probability, which is particulartly important for $\psi'$. Our results on the suppression factors are compared with data from the NA50 and E866/NuSea Collaborations. Predictions are given for the suppression of $J/\psi,~\psi',~\chi_c$ as a function of the nuclear mass and in the negative $x_F$ region, where data will be available soon.
|
0707.3712
|
Dong Phung Van
|
P. V. Dong, D. T. Huong, N. T. Thuy, H. N. Long
|
Higgs phenomenology of supersymmetric economical 3-3-1 model
|
33 pages, 1 figure
|
Nucl.Phys.B795:361-384,2008
|
10.1016/j.nuclphysb.2007.11.035
| null |
hep-ph
| null |
We explore the Higgs sector in the supersymmetric economical 3-3-1 model and
find new features in this sector. The charged Higgs sector is revised i.e., in
difference of the previous work, the exact eigenvalues and states are obtained
without any approximation. In this model, there are three Higgs bosons having
masses equal to that of the gauge bosons--the W and extra X and Y. There is one
scalar boson with mass of 91.4 GeV, which is closed to the $Z$ boson mass and
in good agreement with present limit: 89.8 GeV at 95% CL. The condition of
eliminating for charged scalar tachyon leads to splitting of VEV at the first
symmetry breaking, namely, $w \simeq w^\prime$. The interactions among the
standard model gauge bosons and scalar fields in the framework of the
supersymmetric economical 3-3-1 model are presented. From these couplings, at
some limit, almost scalar Higgs fields can be recognized in accordance with the
standard model. The hadronic cross section for production of the bilepton
charged Higgs boson at the CERN LHC in the effective vector boson approximation
is calculated. Numerical evaluation shows that the cross section can exceed
35.8 fb.
|
[
{
"created": "Wed, 25 Jul 2007 11:27:23 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Dong",
"P. V.",
""
],
[
"Huong",
"D. T.",
""
],
[
"Thuy",
"N. T.",
""
],
[
"Long",
"H. N.",
""
]
] |
We explore the Higgs sector in the supersymmetric economical 3-3-1 model and find new features in this sector. The charged Higgs sector is revised i.e., in difference of the previous work, the exact eigenvalues and states are obtained without any approximation. In this model, there are three Higgs bosons having masses equal to that of the gauge bosons--the W and extra X and Y. There is one scalar boson with mass of 91.4 GeV, which is closed to the $Z$ boson mass and in good agreement with present limit: 89.8 GeV at 95% CL. The condition of eliminating for charged scalar tachyon leads to splitting of VEV at the first symmetry breaking, namely, $w \simeq w^\prime$. The interactions among the standard model gauge bosons and scalar fields in the framework of the supersymmetric economical 3-3-1 model are presented. From these couplings, at some limit, almost scalar Higgs fields can be recognized in accordance with the standard model. The hadronic cross section for production of the bilepton charged Higgs boson at the CERN LHC in the effective vector boson approximation is calculated. Numerical evaluation shows that the cross section can exceed 35.8 fb.
|
hep-ph/0512185
|
Thomas D. Cohen
|
Thomas D. Cohen and Leonid Ya. Glozman
|
A simple toy model for effective restoration of chiral symmetry in
excited hadrons
|
This is the published version of this paper. Note that the title has
changed from earlier versions as has the abstract. The emphasis is slightly
different from previous versions but the essential physical content is the
same
|
Mod.Phys.Lett. A21 (2006) 1939-1945
|
10.1142/S0217732306021360
| null |
hep-ph
| null |
A simple solvable toy model exhibiting effective restoration of chiral
symmetry in excited hadrons is constructed. A salient feature is that while
physics of the low-lying states is crucially determined by the spontaneous
breaking of chiral symmetry, in the high-lying states the effects of chiral
symmetry breaking represent only a small correction. Asymptotically the states
approach the regime where their properties are determined by the underlying
unbroken chiral symmetry.
|
[
{
"created": "Wed, 14 Dec 2005 16:04:39 GMT",
"version": "v1"
},
{
"created": "Fri, 13 Jan 2006 16:54:34 GMT",
"version": "v2"
},
{
"created": "Mon, 18 Sep 2006 12:15:44 GMT",
"version": "v3"
}
] |
2009-11-11
|
[
[
"Cohen",
"Thomas D.",
""
],
[
"Glozman",
"Leonid Ya.",
""
]
] |
A simple solvable toy model exhibiting effective restoration of chiral symmetry in excited hadrons is constructed. A salient feature is that while physics of the low-lying states is crucially determined by the spontaneous breaking of chiral symmetry, in the high-lying states the effects of chiral symmetry breaking represent only a small correction. Asymptotically the states approach the regime where their properties are determined by the underlying unbroken chiral symmetry.
|
1201.2135
|
Zhi Hui Guo
|
Yun-Hua Chen, Zhi-Hui Guo, Han-Qing Zheng
|
Study of \eta-\eta' mixing from radiative decay processes
|
32 pages, 9 figures, 3 tables
| null |
10.1103/PhysRevD.85.054018
| null |
hep-ph hep-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We perform a thorough analysis of the VP\gamma(\gamma*) and
P\gamma\gamma(\gamma*) decays in the resonance chiral theory, where V stand for
the vector resonances \rho, K*, \omega, \phi, P stand for \pi, K, \eta, \eta'
and \gamma* subsequently decays into lepton pairs. Upon imposing QCD
short-distance constraints on resonance couplings, the \omega -> \pi
\gamma(\gamma*), \rho -> \pi \gamma(\gamma*), K^{*0} -> K^0\gamma processes
only depend on one free parameter and \pi -> \gamma \gamma(\gamma*) can be
completely predicted. The four mixing parameters of the \eta-\eta' system, i.e.
two mixing angles \theta8, \theta0 and two decay constants F8, F0, are
determined from radiative decays involving \eta or \eta'. The higher order low
energy constants of the pseudo-Goldstone Lagrangian in the chiral anomaly
sector are predicted by integrating out heavy resonances. We also predict the
decay widths of \rho -> \pi e^+ e^-, \eta' -> \gamma e^+ e^- and \phi -> \eta
\mu^+ \mu^-, which can be compared with the future measurement in these
channels.
|
[
{
"created": "Tue, 10 Jan 2012 18:32:37 GMT",
"version": "v1"
}
] |
2013-05-30
|
[
[
"Chen",
"Yun-Hua",
""
],
[
"Guo",
"Zhi-Hui",
""
],
[
"Zheng",
"Han-Qing",
""
]
] |
We perform a thorough analysis of the VP\gamma(\gamma*) and P\gamma\gamma(\gamma*) decays in the resonance chiral theory, where V stand for the vector resonances \rho, K*, \omega, \phi, P stand for \pi, K, \eta, \eta' and \gamma* subsequently decays into lepton pairs. Upon imposing QCD short-distance constraints on resonance couplings, the \omega -> \pi \gamma(\gamma*), \rho -> \pi \gamma(\gamma*), K^{*0} -> K^0\gamma processes only depend on one free parameter and \pi -> \gamma \gamma(\gamma*) can be completely predicted. The four mixing parameters of the \eta-\eta' system, i.e. two mixing angles \theta8, \theta0 and two decay constants F8, F0, are determined from radiative decays involving \eta or \eta'. The higher order low energy constants of the pseudo-Goldstone Lagrangian in the chiral anomaly sector are predicted by integrating out heavy resonances. We also predict the decay widths of \rho -> \pi e^+ e^-, \eta' -> \gamma e^+ e^- and \phi -> \eta \mu^+ \mu^-, which can be compared with the future measurement in these channels.
|
hep-ph/9712425
|
M. D. Scadron
|
M. D. Scadron
|
Comments on compositeness in the SU(2) linear sigma model
|
Latex, 10 pages. To appear in PRD
|
Phys.Rev.D57:5307-5310,1998
|
10.1103/PhysRevD.57.5307
| null |
hep-ph
| null |
First we summarize the quark-level linear $\sigma$ model compositeness
conditions and verify that indeed $m_\sigma = 2 m_q$ when $m_\pi = 0$ and
$N_c=3$, rather than in the $N_c\to\infty$ limit, as is sometimes suggested.
Later we show that this compositeness picture also predicts a chiral symmetry
restoration temperature $T_c = 2f_\pi$, where $f_\pi$ is the pion decay
constant. We contrast this self-consistent Z=0 compositeness analysis with
prior studies of the compositeness problem.
|
[
{
"created": "Wed, 17 Dec 1997 20:09:44 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Dec 1997 22:20:10 GMT",
"version": "v2"
}
] |
2011-07-19
|
[
[
"Scadron",
"M. D.",
""
]
] |
First we summarize the quark-level linear $\sigma$ model compositeness conditions and verify that indeed $m_\sigma = 2 m_q$ when $m_\pi = 0$ and $N_c=3$, rather than in the $N_c\to\infty$ limit, as is sometimes suggested. Later we show that this compositeness picture also predicts a chiral symmetry restoration temperature $T_c = 2f_\pi$, where $f_\pi$ is the pion decay constant. We contrast this self-consistent Z=0 compositeness analysis with prior studies of the compositeness problem.
|
1506.02459
|
Robert Lang
|
Robert Lang, Norbert Kaiser, Wolfram Weise
|
Shear Viscosities from Kubo Formalism in a large-$N_{\rm c}$
Nambu--Jona-Lasinio Model
|
15 pages, 11 figures. Revision with minor corrections matches
published version
|
Eur. Phys. J. A 51 (2015) 127
|
10.1140/epja/i2015-15127-7
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this work the shear viscosity of strongly interacting matter is calculated
within a two-flavor Nambu--Jona-Lasinio model as a function of temperature and
chemical potential. The general Kubo formula is applied, incorporating the full
Dirac structure of the thermal quark spectral function and avoiding commonly
used on-shell approximations. Mesonic fluctuations contributing via Fock
diagrams provide the dominant dissipative processes. The resulting ratio
$\eta/s$ (shear viscosity over entropy density) decreases with temperature and
chemical potential. Interpolating between our NJL results at low temperatures
and hard-thermal-loop results at high temperatures a minimum slightly above the
AdS/CFT benchmark $\eta/s=1/4\pi$ is obtained.
|
[
{
"created": "Mon, 8 Jun 2015 12:05:00 GMT",
"version": "v1"
},
{
"created": "Sun, 18 Oct 2015 14:44:10 GMT",
"version": "v2"
}
] |
2015-10-20
|
[
[
"Lang",
"Robert",
""
],
[
"Kaiser",
"Norbert",
""
],
[
"Weise",
"Wolfram",
""
]
] |
In this work the shear viscosity of strongly interacting matter is calculated within a two-flavor Nambu--Jona-Lasinio model as a function of temperature and chemical potential. The general Kubo formula is applied, incorporating the full Dirac structure of the thermal quark spectral function and avoiding commonly used on-shell approximations. Mesonic fluctuations contributing via Fock diagrams provide the dominant dissipative processes. The resulting ratio $\eta/s$ (shear viscosity over entropy density) decreases with temperature and chemical potential. Interpolating between our NJL results at low temperatures and hard-thermal-loop results at high temperatures a minimum slightly above the AdS/CFT benchmark $\eta/s=1/4\pi$ is obtained.
|
1608.04539
|
Mehmet Ali Olpak
|
M. A. Olpak, A. Ozpineci, V. Tanriverdi
|
Light Cone Distribution Amplitudes of Excited P-Wave Heavy Quarkonia at
the Leading Twist
|
25 pages, 7 figures, minor corrections added
|
Phys. Rev. D 96, 014026 (2017)
|
10.1103/PhysRevD.96.014026
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Leading twist light cone distribution amplitudes (LCDAs) are key ingredients
in calculating various hadronic amplitudes using light cone QCD sum rules. This
work concentrates on calculating the leading twist LCDAs of P-wave heavy
quarkonia. Quark model wavefunctions for the ground, first and second excited
states of P-wave charmonia and bottomonia have been calculated, and are used
for calculating the relevant LCDAs and leptonic decay constants.
|
[
{
"created": "Tue, 16 Aug 2016 10:13:53 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Aug 2016 21:27:41 GMT",
"version": "v2"
}
] |
2017-08-02
|
[
[
"Olpak",
"M. A.",
""
],
[
"Ozpineci",
"A.",
""
],
[
"Tanriverdi",
"V.",
""
]
] |
Leading twist light cone distribution amplitudes (LCDAs) are key ingredients in calculating various hadronic amplitudes using light cone QCD sum rules. This work concentrates on calculating the leading twist LCDAs of P-wave heavy quarkonia. Quark model wavefunctions for the ground, first and second excited states of P-wave charmonia and bottomonia have been calculated, and are used for calculating the relevant LCDAs and leptonic decay constants.
|
1602.02017
|
Apostolos Pilaftsis
|
Apostolos Pilaftsis
|
Symmetries for SM Alignment in multi-Higgs Doublet Models
|
12 pages, no figures, expanded version with significant
clarifications added
|
Phys. Rev. D 93, 075012 (2016)
|
10.1103/PhysRevD.93.075012
|
CERN-PH-TH/2016-057, MAN/HEP/2016/03
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We derive the complete set of continuous maximal symmetries for Standard
Model (SM) alignment that may occur in the tree-level scalar potential of
multi-Higgs Doublet Models, with $n > 2$ Higgs doublets. Our results generalize
the symmetries of SM alignment, without decoupling of large mass scales or
fine-tuning, previously obtained in the context of two-Higgs Doublet Models.
|
[
{
"created": "Fri, 5 Feb 2016 13:35:17 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Feb 2016 17:30:52 GMT",
"version": "v2"
},
{
"created": "Wed, 16 Mar 2016 20:02:36 GMT",
"version": "v3"
}
] |
2016-04-13
|
[
[
"Pilaftsis",
"Apostolos",
""
]
] |
We derive the complete set of continuous maximal symmetries for Standard Model (SM) alignment that may occur in the tree-level scalar potential of multi-Higgs Doublet Models, with $n > 2$ Higgs doublets. Our results generalize the symmetries of SM alignment, without decoupling of large mass scales or fine-tuning, previously obtained in the context of two-Higgs Doublet Models.
|
2312.00882
|
Neda Darvishi
|
Neda Darvishi, Apostolos Pilaftsis and Jiang-Hao Yu
|
Maximising CP Violation in Naturally Aligned Two-Higgs Doublet Models
|
38 pages, 6 figures and 4 tables
|
J. High Energ. Phys. 2024, 233 (2024)
|
10.1007/JHEP05(2024)233
| null |
hep-ph
|
http://creativecommons.org/publicdomain/zero/1.0/
|
The Two-Higgs Doublet Model (2HDM) is a well-motivated theoretical framework
that provides additional sources of CP Violation (CPV) beyond the Standard
Model (SM). After studying the vacuum topology of a general (convex) 2HDM
potential, we unambiguously identify three origins of CPV: (I) Spontaneous CPV
(SCPV), where the vacuum manifold has at least two degenerate CPV minima
disconnected by domain walls, (ii) Explicit CPV (ECPV) with one single CPV
ground state, and (iii) Mixed Spontaneous and Explicit CPV (MCPV), where the
theory possesses more than one $non$-degenerate CPV local minimum. Most
importantly, we define a novel complex parameter $r_{\rm CP}$ whose norm and
phase control the three different realisations of CPV, at least at the tree
level. In all these scenarios, only two CPV phases can be made independent, as
any third CPV parameter will always be constrained via the CP-odd tadpole
condition. Since ECPV vanishes in 2HDMs where SM Higgs alignment is achieved
naturally through accidental continuous symmetries, we analyse the possibility
of maximising CPV through soft and explicit breaking of these symmetries. We
derive upper limits on key CPV parameters that quantify the degree of SM
misalignment from constraints due to the non-observation of an electron
Electric Dipole Moment (EDM). Finally, we delineate the CP-violating parameter
space of the so-constrained naturally aligned 2HDMs that can further be probed
at the CERN Large Hadron Collider (LHC).
|
[
{
"created": "Fri, 1 Dec 2023 19:12:33 GMT",
"version": "v1"
},
{
"created": "Tue, 7 May 2024 16:23:45 GMT",
"version": "v2"
}
] |
2024-05-24
|
[
[
"Darvishi",
"Neda",
""
],
[
"Pilaftsis",
"Apostolos",
""
],
[
"Yu",
"Jiang-Hao",
""
]
] |
The Two-Higgs Doublet Model (2HDM) is a well-motivated theoretical framework that provides additional sources of CP Violation (CPV) beyond the Standard Model (SM). After studying the vacuum topology of a general (convex) 2HDM potential, we unambiguously identify three origins of CPV: (I) Spontaneous CPV (SCPV), where the vacuum manifold has at least two degenerate CPV minima disconnected by domain walls, (ii) Explicit CPV (ECPV) with one single CPV ground state, and (iii) Mixed Spontaneous and Explicit CPV (MCPV), where the theory possesses more than one $non$-degenerate CPV local minimum. Most importantly, we define a novel complex parameter $r_{\rm CP}$ whose norm and phase control the three different realisations of CPV, at least at the tree level. In all these scenarios, only two CPV phases can be made independent, as any third CPV parameter will always be constrained via the CP-odd tadpole condition. Since ECPV vanishes in 2HDMs where SM Higgs alignment is achieved naturally through accidental continuous symmetries, we analyse the possibility of maximising CPV through soft and explicit breaking of these symmetries. We derive upper limits on key CPV parameters that quantify the degree of SM misalignment from constraints due to the non-observation of an electron Electric Dipole Moment (EDM). Finally, we delineate the CP-violating parameter space of the so-constrained naturally aligned 2HDMs that can further be probed at the CERN Large Hadron Collider (LHC).
|
1402.3419
|
Barbara Betz
|
Barbara Betz and Miklos Gyulassy
|
Azimuthal Jet Tomography at RHIC and LHC
|
4 pages, 3 figures, proceedings of the Hard Probes 2013 Conference
| null | null | null |
hep-ph nucl-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A generic jet-energy loss model that is coupled to state-of-the-art
hydrodynamic fields and interpolates between a wide class of running coupling
pQCD-based and AdS/CFT-inspired models is compared to recent data on the
azimuthal and transverse momentum dependence of high-pT pion nuclear
modification factors and high-pT elliptic flow measured at RHIC and LHC. We
find that RHIC data are surprisingly consistent with various scenarios
considered. However, extrapolations to LHC energies favor running coupling
pQCD-based models of jet-energy loss. While conformal holographic models are
shown to be inconsistent with data, recent non-conformal generalizations of AdS
holography may provide an alternative description.
|
[
{
"created": "Fri, 14 Feb 2014 10:19:59 GMT",
"version": "v1"
}
] |
2014-02-17
|
[
[
"Betz",
"Barbara",
""
],
[
"Gyulassy",
"Miklos",
""
]
] |
A generic jet-energy loss model that is coupled to state-of-the-art hydrodynamic fields and interpolates between a wide class of running coupling pQCD-based and AdS/CFT-inspired models is compared to recent data on the azimuthal and transverse momentum dependence of high-pT pion nuclear modification factors and high-pT elliptic flow measured at RHIC and LHC. We find that RHIC data are surprisingly consistent with various scenarios considered. However, extrapolations to LHC energies favor running coupling pQCD-based models of jet-energy loss. While conformal holographic models are shown to be inconsistent with data, recent non-conformal generalizations of AdS holography may provide an alternative description.
|
hep-ph/0606113
|
Cheuk-Yin Wong
|
Wei-Ning Zhang (1,2,3), Yan-Yu Ren (2), and Cheuk-Yin Wong (3,4), ((1)
Dalian University of Technology, Dalian, (2) Harbin Institute of Technology,
Harbin, (3) Oak Ridge National Laboratory, and (4) University of Tennessee)
|
Analysis of pion elliptic flows and HBT interferometry in a granular
quark-gluon plasma droplet model
|
9 pages, 6 figures, in Latex
|
Phys.Rev. C74 (2006) 024908
|
10.1103/PhysRevC.74.024908
| null |
hep-ph
| null |
In many simulations of high-energy heavy-ion collisions on an event-by-event
analysis, it is known that the initial energy density distribution in the
transverse plane is highly fluctuating. Subsequent longitudinal expansion will
lead to many longitudinal tubes of quark-gluon plasma which have tendencies to
break up into many spherical droplets because of sausage instabilities. We are
therefore motivated to use a model of quark-gluon plasma granular droplets that
evolve hydrodynamically to investigate pion elliptic flows and
Hanbury-Brown-Twiss interferometry. We find that the data of pion transverse
momentum spectra, elliptic flows, and HBT radii in \sqrt{s_{NN}}=200 GeV Au +
Au collisions at RHIC can be described well by an expanding source of granular
droplets with an anisotropic velocity distribution.
|
[
{
"created": "Fri, 9 Jun 2006 17:02:57 GMT",
"version": "v1"
}
] |
2009-11-11
|
[
[
"Zhang",
"Wei-Ning",
""
],
[
"Ren",
"Yan-Yu",
""
],
[
"Wong",
"Cheuk-Yin",
""
]
] |
In many simulations of high-energy heavy-ion collisions on an event-by-event analysis, it is known that the initial energy density distribution in the transverse plane is highly fluctuating. Subsequent longitudinal expansion will lead to many longitudinal tubes of quark-gluon plasma which have tendencies to break up into many spherical droplets because of sausage instabilities. We are therefore motivated to use a model of quark-gluon plasma granular droplets that evolve hydrodynamically to investigate pion elliptic flows and Hanbury-Brown-Twiss interferometry. We find that the data of pion transverse momentum spectra, elliptic flows, and HBT radii in \sqrt{s_{NN}}=200 GeV Au + Au collisions at RHIC can be described well by an expanding source of granular droplets with an anisotropic velocity distribution.
|
hep-ph/0012265
|
Janos Polonyi
|
Janos Polonyi
|
Confinement as crossover
|
8 pages, delivered at the Workshop on Quark Matter in Astro- and
Particle Physics, Rostock, Germany, november, 2000
| null | null | null |
hep-ph
| null |
The order parameter of confinement together with the haaron model of the QCD
vacuum is reviewed and it is pointed out that confining forces are generated by
the non-renormalizable, invariant Haar-measure vertices of the path integral. A
hybrid model is proposed for the description of the crossover leading to the
confining vacuum. This scenario suggests that the differences between the low
and the high temperature phases of QCD should be looked for in the quark
channels instead of the hadronic sector.
|
[
{
"created": "Wed, 20 Dec 2000 08:02:41 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Polonyi",
"Janos",
""
]
] |
The order parameter of confinement together with the haaron model of the QCD vacuum is reviewed and it is pointed out that confining forces are generated by the non-renormalizable, invariant Haar-measure vertices of the path integral. A hybrid model is proposed for the description of the crossover leading to the confining vacuum. This scenario suggests that the differences between the low and the high temperature phases of QCD should be looked for in the quark channels instead of the hadronic sector.
|
2206.00042
|
Maxim Dvornikov
|
Maxim Dvornikov (IZMIRAN)
|
Gravitational scattering of spinning neutrinos by a rotating black hole
with a slim magnetized accretion disk
|
16 pages in LaTeX2e, 11 eps figures; paper is significantly extended,
Fig. 3 is added, new appendix is included; version to be published in
Classical and Quantum Gravity
|
Classical and Quantum Gravity 40, 015002 (2023)
|
10.1088/1361-6382/aca45a
| null |
hep-ph astro-ph.HE gr-qc
|
http://creativecommons.org/licenses/by/4.0/
|
We study neutrinos gravitationally scattered off a rotating supermassive
black hole which is surrounded by a thin accretion disk with a realistic
magnetic field. Neutrinos are supposed to be Dirac particles having a nonzero
magnetic moment. Neutrinos move along arbitrary trajectories, with the incoming
flux being parallel to the equatorial plane. We exactly account for the
influence of both gravity and the magnetic field on the neutrino motion and its
spin evolution. The general statement that the helicity of an ultrarelativistic
neutrino is constant in the particle scattering in an arbitrary gravitational
field is proven within the quasiclassical approach. We find the measurable
fluxes of outgoing neutrinos taking into account the neutrino spin precession
in the external field in curved spacetime. These fluxes turn out to be
significantly suppressed for some parameters of the system. Finally, we discuss
the possibility to observe the predicted phenomena for core-collapsing
supernova neutrinos in our Galaxy.
|
[
{
"created": "Tue, 31 May 2022 18:22:00 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Nov 2022 08:58:18 GMT",
"version": "v2"
}
] |
2022-12-05
|
[
[
"Dvornikov",
"Maxim",
"",
"IZMIRAN"
]
] |
We study neutrinos gravitationally scattered off a rotating supermassive black hole which is surrounded by a thin accretion disk with a realistic magnetic field. Neutrinos are supposed to be Dirac particles having a nonzero magnetic moment. Neutrinos move along arbitrary trajectories, with the incoming flux being parallel to the equatorial plane. We exactly account for the influence of both gravity and the magnetic field on the neutrino motion and its spin evolution. The general statement that the helicity of an ultrarelativistic neutrino is constant in the particle scattering in an arbitrary gravitational field is proven within the quasiclassical approach. We find the measurable fluxes of outgoing neutrinos taking into account the neutrino spin precession in the external field in curved spacetime. These fluxes turn out to be significantly suppressed for some parameters of the system. Finally, we discuss the possibility to observe the predicted phenomena for core-collapsing supernova neutrinos in our Galaxy.
|
hep-ph/0007360
|
Matthias Neubert
|
Alexander L. Kagan (Cincinnati) and Matthias Neubert (Cornell)
|
Implications of a Low sin(2 beta): A Strategy for Exploring New Flavor
Physics
|
9 pages, 6 figures
|
Phys.Lett.B492:115-122,2000
|
10.1016/S0370-2693(00)01070-4
| null |
hep-ph hep-ex
| null |
We explore the would-be consequences of a low value of the CP-violating phase
$\sin2\beta_{\psi K}$. The importance of a reference triangle obtained from
measurements that are independent of $B$--$\bar B$ and $K$--$\bar K$ mixing is
stressed. It can be used to extract separately potential New Physics
contributions to mixing in the $B_d$, $B_s$ and $K$ systems. We discuss several
constructions of this triangle, which will be feasible in the near future. The
discrete ambiguity is at most two-fold and eventually can be completely
removed. Simultaneously, it will be possible to probe for New Physics in
loop-dominated rare decays.
|
[
{
"created": "Mon, 31 Jul 2000 17:26:52 GMT",
"version": "v1"
}
] |
2010-11-23
|
[
[
"Kagan",
"Alexander L.",
"",
"Cincinnati"
],
[
"Neubert",
"Matthias",
"",
"Cornell"
]
] |
We explore the would-be consequences of a low value of the CP-violating phase $\sin2\beta_{\psi K}$. The importance of a reference triangle obtained from measurements that are independent of $B$--$\bar B$ and $K$--$\bar K$ mixing is stressed. It can be used to extract separately potential New Physics contributions to mixing in the $B_d$, $B_s$ and $K$ systems. We discuss several constructions of this triangle, which will be feasible in the near future. The discrete ambiguity is at most two-fold and eventually can be completely removed. Simultaneously, it will be possible to probe for New Physics in loop-dominated rare decays.
|
1410.4522
|
Umberto D'Alesio
|
Umberto D'Alesio (1), Miguel G. Echevarr\'ia (2), Stefano Melis (3),
and Ignazio Scimemi (4) ((1) University and INFN, Cagliari, Italy, (2) Nikhef
and VU University, Amsterdam, the Netherlands, (3) University of Torino,
Italy, (4) Universidad Complutense, Madrid, Spain)
|
TMDs: Evolution, modeling, precision
|
6 pages, 3 pdf figures, uses webofc.cls. Invited talk delivered by I.
Scimemi at the Fourth International Workshop on "Transverse Polarisation
Phenomena in Hard Processes" (Transversity 2014), Chia, Cagliari, Italy, June
9-13, 2014. To appear in EPJ Web of Conferences
| null |
10.1051/epjconf/20158502003
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The factorization theorem for $q_T$ spectra in Drell-Yan processes, boson
production and semi-inclusive deep inelastic scattering allows for the
determination of the non-perturbative parts of transverse momentum dependent
parton distribution functions. Here we discuss the fit of Drell-Yan and
$Z$-production data using the transverse momentum dependent formalism and the
resummation of the evolution kernel. We find a good theoretical stability of
the results and a final $\chi^2/{\rm points}\lesssim 1$. We show how the fixing
of the non-perturbative pieces of the evolution can be used to make predictions
at present and future colliders.
|
[
{
"created": "Thu, 16 Oct 2014 18:14:22 GMT",
"version": "v1"
}
] |
2015-06-23
|
[
[
"D'Alesio",
"Umberto",
""
],
[
"Echevarría",
"Miguel G.",
""
],
[
"Melis",
"Stefano",
""
],
[
"Scimemi",
"Ignazio",
""
]
] |
The factorization theorem for $q_T$ spectra in Drell-Yan processes, boson production and semi-inclusive deep inelastic scattering allows for the determination of the non-perturbative parts of transverse momentum dependent parton distribution functions. Here we discuss the fit of Drell-Yan and $Z$-production data using the transverse momentum dependent formalism and the resummation of the evolution kernel. We find a good theoretical stability of the results and a final $\chi^2/{\rm points}\lesssim 1$. We show how the fixing of the non-perturbative pieces of the evolution can be used to make predictions at present and future colliders.
|
0912.2486
|
Koji Ishiwata
|
Koji Ishiwata, Shigeki Matsumoto, Takeo Moroi
|
Cosmic Gamma-ray from Inverse Compton Process in Unstable Dark Matter
Scenario
|
9 pages, 3 figures. To appear in the proceedings of SciNeGHE 2009
Gamma Ray Physics in the LHC Era ASSISI, Italy, October 7-9, 2009
| null |
10.1063/1.3395997
|
TU-859, UT-HET 032
|
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Motivated by the PAMELA anomaly in the fluxes of cosmic-ray positron and
electron, we study the cosmic gamma-ray induced by the inverse Compton (IC)
scattering process in unstable dark matter scenario assuming that the anomaly
is due to the positron and electron emission by the decay of dark matter. We
calculate the fluxes of IC-induced gamma-ray produced in our Galaxy and that
from cosmological distance, and show that both of them are significant. We
discuss a possibility that large dark matter mass over TeV scale might be
constrained by the gamma-ray observation by Fermi Gamma-ray Space Telescope.
|
[
{
"created": "Sun, 13 Dec 2009 12:32:19 GMT",
"version": "v1"
}
] |
2015-05-14
|
[
[
"Ishiwata",
"Koji",
""
],
[
"Matsumoto",
"Shigeki",
""
],
[
"Moroi",
"Takeo",
""
]
] |
Motivated by the PAMELA anomaly in the fluxes of cosmic-ray positron and electron, we study the cosmic gamma-ray induced by the inverse Compton (IC) scattering process in unstable dark matter scenario assuming that the anomaly is due to the positron and electron emission by the decay of dark matter. We calculate the fluxes of IC-induced gamma-ray produced in our Galaxy and that from cosmological distance, and show that both of them are significant. We discuss a possibility that large dark matter mass over TeV scale might be constrained by the gamma-ray observation by Fermi Gamma-ray Space Telescope.
|
1509.08286
|
Ioannis Iatrakis Mr.
|
Ioannis Iatrakis and Dmitri E. Kharzeev
|
Holographic entropy and real-time dynamics of quarkonium dissociation in
non-Abelian plasma
|
7 pages, 5 figures
|
Phys. Rev. D 93, 086009 (2016)
|
10.1103/PhysRevD.93.086009
| null |
hep-ph hep-th nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The peak of the heavy quark pair entropy at the deconfinement transition,
observed in lattice QCD, suggests that the transition is effectively driven by
the increase of the entropy of bound states. The growth of the entropy with the
inter-quark distance leads to the emergent entropic force that induces
dissociation of quarkonium states. Since the quark-gluon plasma around the
transition point is a strongly coupled system, we use the gauge-gravity duality
to study the entropy of heavy quarkonium and the real-time dynamics of its
dissociation. In particular, we employ the Improved Holographic QCD model as a
dual description of large $N_c$ Yang Mills theory. Studying the dynamics of the
fundamental string between the quarks placed on the boundary, we find that the
entropy peaks at the transition point. We also study the real-time dynamics of
the system by considering the holographic string falling in the black hole
horizon where it equilibrates. In the vicinity the deconfinement transition,
the dissociation time is found to be less than a fermi, suggesting that the
entropic destruction is the dominant dissociation mechanism in this temperature
region.
|
[
{
"created": "Mon, 28 Sep 2015 12:04:12 GMT",
"version": "v1"
}
] |
2016-05-04
|
[
[
"Iatrakis",
"Ioannis",
""
],
[
"Kharzeev",
"Dmitri E.",
""
]
] |
The peak of the heavy quark pair entropy at the deconfinement transition, observed in lattice QCD, suggests that the transition is effectively driven by the increase of the entropy of bound states. The growth of the entropy with the inter-quark distance leads to the emergent entropic force that induces dissociation of quarkonium states. Since the quark-gluon plasma around the transition point is a strongly coupled system, we use the gauge-gravity duality to study the entropy of heavy quarkonium and the real-time dynamics of its dissociation. In particular, we employ the Improved Holographic QCD model as a dual description of large $N_c$ Yang Mills theory. Studying the dynamics of the fundamental string between the quarks placed on the boundary, we find that the entropy peaks at the transition point. We also study the real-time dynamics of the system by considering the holographic string falling in the black hole horizon where it equilibrates. In the vicinity the deconfinement transition, the dissociation time is found to be less than a fermi, suggesting that the entropic destruction is the dominant dissociation mechanism in this temperature region.
|
0803.1731
|
Jaroslav Trnka
|
Karol Kampf, Jiri Novotny, Jaroslav Trnka
|
Renormalization of tensor self-energy in Resonance Chiral Theory
|
7 pages, presented by J.T. at Hadron structure 07, Slovakia
|
Fizika B17:349-354,2008
| null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the problems related to the renormalization of propagators in
Resonance Chiral Theory, concentrating on the case of vector $1^{--}$
resonances in the antisymmetric tensor formalism. We have found that
renormalization of the divergences of the self-energy graphs needs new type of
kinetic counterterms with two derivatives which are not present in the original
leading order Lagrangian. The general form of the propagator for antisymmetric
tensor fields could then contain not only poles corresponding to the original
$1^{--}$ resonance states but also to the additional states with opposite
parity which decouple in the free field limit. In some cases, these dynamically
generated additional states might be negative norm ghosts or tachyons.
|
[
{
"created": "Wed, 12 Mar 2008 09:38:10 GMT",
"version": "v1"
}
] |
2009-02-20
|
[
[
"Kampf",
"Karol",
""
],
[
"Novotny",
"Jiri",
""
],
[
"Trnka",
"Jaroslav",
""
]
] |
We study the problems related to the renormalization of propagators in Resonance Chiral Theory, concentrating on the case of vector $1^{--}$ resonances in the antisymmetric tensor formalism. We have found that renormalization of the divergences of the self-energy graphs needs new type of kinetic counterterms with two derivatives which are not present in the original leading order Lagrangian. The general form of the propagator for antisymmetric tensor fields could then contain not only poles corresponding to the original $1^{--}$ resonance states but also to the additional states with opposite parity which decouple in the free field limit. In some cases, these dynamically generated additional states might be negative norm ghosts or tachyons.
|
1303.6087
|
O.Yu. Shevchenko
|
O. Yu. Shevchenko
|
Direct connection between the different QCD orders for parton
distribution and fragmentation functions
| null | null |
10.1103/PhysRevD.87.114004
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The formulas directly connecting parton distribution functions (PDFs) and
fragmentation functions (FFs) at the next to leading order (NLO) QCD with the
same quantities at the leading order (LO) are derived. These formulas are
universal, i.e. have the same form for all kinds of PDFs and FFs, differing
only in the respective splitting functions entering there.
|
[
{
"created": "Mon, 25 Mar 2013 11:12:44 GMT",
"version": "v1"
}
] |
2013-06-12
|
[
[
"Shevchenko",
"O. Yu.",
""
]
] |
The formulas directly connecting parton distribution functions (PDFs) and fragmentation functions (FFs) at the next to leading order (NLO) QCD with the same quantities at the leading order (LO) are derived. These formulas are universal, i.e. have the same form for all kinds of PDFs and FFs, differing only in the respective splitting functions entering there.
|
1806.02037
|
Abdullatif \c{C}al{\i}\c{s}kan <
|
Abdullatif Caliskan and Seyit Okan Kara
|
Single production of the excited electrons at the future FCC-based
lepton-hadron colliders
|
14 pages, 6 figures, 2 tables
|
International Journal of Modern Physics A, Vol. 33, 1850141, 2018
|
10.1142/S0217751X18501415
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study composite electron production at the FCC-based three electron-proton
colliders with the center-of-mass energies of $3.46$, $10$ and $31.6$ TeV. For
the signal process of $ep\rightarrow e^{\star}X\rightarrow e\gamma X$ , the
production cross-sections and decay widhts of the excited electrons have been
calculated. The differences of some kinematical quantities of the final state
particles between the signal and background have been analyzed. For this
purpose, transverse momentum and pseudorapidity distributions of electron and
photon have been obtained and the kinematical cuts for discovery of the excited
electrons have been assigned. We have finally determined the mass limits of
excited electrons for observation and discovery by applying these cuts. It is
shown that the mass limit for discovery obtained from the collider with
$\sqrt{s}=31.6$ TeV (called PWFA-LC$\otimes$FCC) is $22.3$ TeV for the
integrated luminosity $L_{int}=10$ $fb^{-1}$.
|
[
{
"created": "Wed, 6 Jun 2018 07:27:53 GMT",
"version": "v1"
}
] |
2018-08-23
|
[
[
"Caliskan",
"Abdullatif",
""
],
[
"Kara",
"Seyit Okan",
""
]
] |
We study composite electron production at the FCC-based three electron-proton colliders with the center-of-mass energies of $3.46$, $10$ and $31.6$ TeV. For the signal process of $ep\rightarrow e^{\star}X\rightarrow e\gamma X$ , the production cross-sections and decay widhts of the excited electrons have been calculated. The differences of some kinematical quantities of the final state particles between the signal and background have been analyzed. For this purpose, transverse momentum and pseudorapidity distributions of electron and photon have been obtained and the kinematical cuts for discovery of the excited electrons have been assigned. We have finally determined the mass limits of excited electrons for observation and discovery by applying these cuts. It is shown that the mass limit for discovery obtained from the collider with $\sqrt{s}=31.6$ TeV (called PWFA-LC$\otimes$FCC) is $22.3$ TeV for the integrated luminosity $L_{int}=10$ $fb^{-1}$.
|
hep-ph/0411372
|
W. James Stirling
|
W. J. Stirling (IPPP, University of Durham)
|
QCD Theory
|
10 pages, 11 figures, plenary talk presented at ICHEP04, Beijing,
China, August 2004
|
Int.J.Mod.Phys. A20 (2005) 5234-5243
|
10.1142/S0217751X05028740
|
IPPP/04/79, DCPT/04/158
|
hep-ph
| null |
Quantum Chromodynamics is an established part of the Standard Model and an
essential part of the toolkit for searching for new physics at high-energy
colliders. I present a status report on the theory of QCD and review some of
the important developments in the past year.
|
[
{
"created": "Mon, 29 Nov 2004 16:21:01 GMT",
"version": "v1"
}
] |
2009-11-10
|
[
[
"Stirling",
"W. J.",
"",
"IPPP, University of Durham"
]
] |
Quantum Chromodynamics is an established part of the Standard Model and an essential part of the toolkit for searching for new physics at high-energy colliders. I present a status report on the theory of QCD and review some of the important developments in the past year.
|
0810.5071
|
Marek Schoenherr
|
Marek Schoenherr, Frank Krauss
|
Soft Photon Radiation in Particle Decays in SHERPA
|
59 pages, 12 figures, 5 tables, published version (typos corrected)
|
JHEP 0812:018,2008
|
10.1088/1126-6708/2008/12/018
|
DCPT/07/96, IPPP/07/48, MCNET 08/15
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper the Yennie-Frautschi-Suura approach is used to simulate real
and virtual QED corrections in particle decays. It makes use of the universal
structure of soft photon corrections to resum the leading logarithmic QED
corrections to all orders, and it allows a systematic correction of this
approximate result to exact fixed order results from perturbation theory. The
approach has been implemented as a Monte Carlo algorithm, which a posteriori
modifies decay matrix elements through the emission of varying numbers of
photons. The corresponding computer code is incorporated into the SHERPA event
generator framework.
|
[
{
"created": "Tue, 28 Oct 2008 16:20:18 GMT",
"version": "v1"
},
{
"created": "Sat, 13 Dec 2008 16:55:10 GMT",
"version": "v2"
}
] |
2009-01-30
|
[
[
"Schoenherr",
"Marek",
""
],
[
"Krauss",
"Frank",
""
]
] |
In this paper the Yennie-Frautschi-Suura approach is used to simulate real and virtual QED corrections in particle decays. It makes use of the universal structure of soft photon corrections to resum the leading logarithmic QED corrections to all orders, and it allows a systematic correction of this approximate result to exact fixed order results from perturbation theory. The approach has been implemented as a Monte Carlo algorithm, which a posteriori modifies decay matrix elements through the emission of varying numbers of photons. The corresponding computer code is incorporated into the SHERPA event generator framework.
|
0707.4250
|
Aron Bernstein
|
A.M. Bernstein
|
Opening Remarks at Chiral Dynamics 2006:Experimental Tests of Chiral
Symmetry Breaking
|
15 pages, 4 figures, slightly revised and corrected version
| null | null | null |
hep-ph
| null |
A physical introduction to the basics of chiral dynamics is presented.
Emphasis is placed on experimental tests which have generally demonstrated a
strong confirmation of the predictions of chiral perturbation theory, a low
energy effective field theory of QCD. Special attention is paid to a few cases
where discrepancies exist, requiring further work. Some desirable future tests
are also recommended.
|
[
{
"created": "Sat, 28 Jul 2007 17:54:40 GMT",
"version": "v1"
},
{
"created": "Sun, 21 Oct 2007 21:25:26 GMT",
"version": "v2"
}
] |
2007-10-22
|
[
[
"Bernstein",
"A. M.",
""
]
] |
A physical introduction to the basics of chiral dynamics is presented. Emphasis is placed on experimental tests which have generally demonstrated a strong confirmation of the predictions of chiral perturbation theory, a low energy effective field theory of QCD. Special attention is paid to a few cases where discrepancies exist, requiring further work. Some desirable future tests are also recommended.
|
0811.0341
|
Marco Ciuchini
|
M. Ciuchini, E. Franco, G. Martinelli, M. Pierini, L. Silvestrini
|
Searching For New Physics With B to K pi Decays
|
8 pages, 8 figures, 2 tables. v2:final version to appear in Phys.
Lett. B
|
Phys.Lett.B674:197-203,2009
|
10.1016/j.physletb.2009.03.011
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We propose a method to quantify the Standard Model uncertainty in B to K pi
decays using the experimental data, assuming that power counting provides a
reasonable estimate of the subleading terms in the 1/mb expansion. Using this
method, we show that present B to K pi data are compatible with the Standard
Model. We analyze the pattern of subleading terms required to reproduce the B
to K pi data and argue that anomalously large subleading terms are not needed.
Finally, we find that S(KS pi0) is fairly insensitive to hadronic uncertainties
and obtain the Standard Model estimate S(KS pi0)=0.74 +- 0.04.
|
[
{
"created": "Mon, 3 Nov 2008 17:00:27 GMT",
"version": "v1"
},
{
"created": "Fri, 27 Mar 2009 16:56:29 GMT",
"version": "v2"
}
] |
2009-04-06
|
[
[
"Ciuchini",
"M.",
""
],
[
"Franco",
"E.",
""
],
[
"Martinelli",
"G.",
""
],
[
"Pierini",
"M.",
""
],
[
"Silvestrini",
"L.",
""
]
] |
We propose a method to quantify the Standard Model uncertainty in B to K pi decays using the experimental data, assuming that power counting provides a reasonable estimate of the subleading terms in the 1/mb expansion. Using this method, we show that present B to K pi data are compatible with the Standard Model. We analyze the pattern of subleading terms required to reproduce the B to K pi data and argue that anomalously large subleading terms are not needed. Finally, we find that S(KS pi0) is fairly insensitive to hadronic uncertainties and obtain the Standard Model estimate S(KS pi0)=0.74 +- 0.04.
|
1906.07356
|
Ting Cheng
|
Ting Cheng, Reinard Primulando, Martin Spinrath
|
Dark Matter Induced Brownian Motion
|
12 pages, 3 figures; version published in EPJ C
|
Eur. Phys. J. C 80, 519 (2020)
|
10.1140/epjc/s10052-020-8066-8
| null |
hep-ph astro-ph.CO hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss a novel approach for directional, light dark matter searches
inspired by the high precision position measurements achieved in gravitational
wave detectors. If dark matter interacts with ordinary matter, movable masses
are subject to an effect similar to Brownian motion induced by the scattering
with dark matter particles which exhibits certain characteristics and could be
observed. We provide estimates for the sensitivity of a hypothetical experiment
looking for that motion. Interestingly, if successful, our approach would allow
to constrain the local distribution of dark matter momentum.
|
[
{
"created": "Tue, 18 Jun 2019 03:04:10 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Jun 2020 04:43:55 GMT",
"version": "v2"
}
] |
2020-06-12
|
[
[
"Cheng",
"Ting",
""
],
[
"Primulando",
"Reinard",
""
],
[
"Spinrath",
"Martin",
""
]
] |
We discuss a novel approach for directional, light dark matter searches inspired by the high precision position measurements achieved in gravitational wave detectors. If dark matter interacts with ordinary matter, movable masses are subject to an effect similar to Brownian motion induced by the scattering with dark matter particles which exhibits certain characteristics and could be observed. We provide estimates for the sensitivity of a hypothetical experiment looking for that motion. Interestingly, if successful, our approach would allow to constrain the local distribution of dark matter momentum.
|
2307.02544
|
Matthew Pearce Mr
|
Peter Athron, Csaba Bal\'azs, Tom\'as E. Gonzalo, Matthew Pearce
|
Falsifying Pati-Salam models with LIGO
|
7 pages, 2 figures, v2: added citations
| null | null |
TTP23-022
|
hep-ph astro-ph.CO
|
http://creativecommons.org/licenses/by/4.0/
|
We demonstrate that existing gravitational wave data from LIGO already places
constraints on well motivated Pati-Salam models that allow the Standard Model
to be embedded within grand unified theories. For the first time in these
models we also constrain the parameter space by requiring that the phase
transition completes, with the resulting constraint being competitive with the
limits from LIGO data. Both constraints are complementary to the LHC
constraints and can exclude scenarios that are much heavier than can be probed
in colliders. Finally we show that results from future LIGO runs, and the
planned Einstein telescope, will substantially increase the limits we place on
the parameter space.
|
[
{
"created": "Wed, 5 Jul 2023 18:00:03 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Aug 2023 06:14:19 GMT",
"version": "v2"
}
] |
2023-08-07
|
[
[
"Athron",
"Peter",
""
],
[
"Balázs",
"Csaba",
""
],
[
"Gonzalo",
"Tomás E.",
""
],
[
"Pearce",
"Matthew",
""
]
] |
We demonstrate that existing gravitational wave data from LIGO already places constraints on well motivated Pati-Salam models that allow the Standard Model to be embedded within grand unified theories. For the first time in these models we also constrain the parameter space by requiring that the phase transition completes, with the resulting constraint being competitive with the limits from LIGO data. Both constraints are complementary to the LHC constraints and can exclude scenarios that are much heavier than can be probed in colliders. Finally we show that results from future LIGO runs, and the planned Einstein telescope, will substantially increase the limits we place on the parameter space.
|
hep-ph/0010346
|
Li De-Ming
|
De-Min Li, Hong Yu, Qi-Xing Shen
|
Modification of Kawai model about the mixing of the pseudoscalar mesons
|
revtex 8 pages
|
Mod.Phys.Lett.A15:1213-1219,2000
|
10.1142/S0217732300001456
| null |
hep-ph
| null |
The Kawai model describing the glueball-quarkonia mixing is modified. The
mixing of $\eta$, $\eta^\prime$ and $\eta(1410)$ is re-investigated based on
the modified Kawai model. The glueball-quarkonia content of the three states is
determined from a fit to the data of the electromagnetic decays involving
$\eta$, $\eta^\prime$. Some predictions about the electromagnetic decays
involving $\eta(1410)$ are presented.
|
[
{
"created": "Tue, 31 Oct 2000 13:28:58 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Li",
"De-Min",
""
],
[
"Yu",
"Hong",
""
],
[
"Shen",
"Qi-Xing",
""
]
] |
The Kawai model describing the glueball-quarkonia mixing is modified. The mixing of $\eta$, $\eta^\prime$ and $\eta(1410)$ is re-investigated based on the modified Kawai model. The glueball-quarkonia content of the three states is determined from a fit to the data of the electromagnetic decays involving $\eta$, $\eta^\prime$. Some predictions about the electromagnetic decays involving $\eta(1410)$ are presented.
|
hep-ph/9511324
|
Jonathan Feng
|
Jonathan L. Feng, Nir Polonsky, and Scott Thomas
|
The Light Higgsino-Gaugino Window
|
14pp, ReVTeX, 3 uuencoded figures. R_b discussion corrected,
references added
|
Phys.Lett. B370 (1996) 95-105
|
10.1016/0370-2693(95)01544-2
|
UCB-PTH-95/40, LBL-37932, LMU-TPW-95-18, SLAC-PUB-95-7050,
NSP-ITP-95-150
|
hep-ph
| null |
Supersymmetric models are typically taken to have $\mu$ parameter and all
soft supersymmetry breaking parameters at or near the weak scale. We point out
that a small window of allowed values exists in which $\mu$ and the electroweak
gaugino masses are in the few GeV range. Such models naturally solve the
supersymmetry $CP$ problem, can reduce the discrepancy in $R_b$, and suppress
proton decay. In this window two neutralinos are in the few GeV range, two are
roughly degenerate with the $Z^0$, and both charginos are roughly degenerate
with the $W^{\pm}$ bosons. Such a signature cannot escape detection at LEP II.
Models that fall in this window automatically arise from renormalizable hidden
sectors in which hidden sector singlets participate only radiatively in
supersymmetry breaking.
|
[
{
"created": "Wed, 15 Nov 1995 10:55:59 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Nov 1995 10:27:09 GMT",
"version": "v2"
}
] |
2009-10-28
|
[
[
"Feng",
"Jonathan L.",
""
],
[
"Polonsky",
"Nir",
""
],
[
"Thomas",
"Scott",
""
]
] |
Supersymmetric models are typically taken to have $\mu$ parameter and all soft supersymmetry breaking parameters at or near the weak scale. We point out that a small window of allowed values exists in which $\mu$ and the electroweak gaugino masses are in the few GeV range. Such models naturally solve the supersymmetry $CP$ problem, can reduce the discrepancy in $R_b$, and suppress proton decay. In this window two neutralinos are in the few GeV range, two are roughly degenerate with the $Z^0$, and both charginos are roughly degenerate with the $W^{\pm}$ bosons. Such a signature cannot escape detection at LEP II. Models that fall in this window automatically arise from renormalizable hidden sectors in which hidden sector singlets participate only radiatively in supersymmetry breaking.
|
2208.00517
|
Yunhua Ding
|
Yunhua Ding
|
Searches for Lorentz and CPT Violation with Confined Particles
|
Presented at the Ninth Meeting on CPT and Lorentz Symmetry,
Bloomington, Indiana, May 17-26, 2022
| null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
An overview of recent progress on searches for Lorentz- and CPT-violating
signals with confined particles and antiparticles in Penning traps is
presented. In the context of the Standard-Model Extension (SME), leading-order
shifts in the cyclotron and anomaly frequencies of a confined particle and
antiparticle due to Lorentz and CPT violation are provided. The two frequencies
are then related to comparisons of charge-to-mass ratios and magnetic moments
between particles and antiparticles. Applying reported results from
Penning-trap experiments leads to new limits on various coefficients for
Lorentz violation.
|
[
{
"created": "Sun, 31 Jul 2022 20:54:42 GMT",
"version": "v1"
}
] |
2022-08-02
|
[
[
"Ding",
"Yunhua",
""
]
] |
An overview of recent progress on searches for Lorentz- and CPT-violating signals with confined particles and antiparticles in Penning traps is presented. In the context of the Standard-Model Extension (SME), leading-order shifts in the cyclotron and anomaly frequencies of a confined particle and antiparticle due to Lorentz and CPT violation are provided. The two frequencies are then related to comparisons of charge-to-mass ratios and magnetic moments between particles and antiparticles. Applying reported results from Penning-trap experiments leads to new limits on various coefficients for Lorentz violation.
|
hep-ph/0605074
|
Yoshio Koide
|
Yoshio Koide
|
Tribimaximal Neutrino Mixing and a Relation Between Neutrino- and
Charged Lepton-Mass Spectra
|
13 pages, presentation modified
|
J.Phys.G34:1653-1664,2007
|
10.1088/0954-3899/34/7/006
|
US-06-03R
|
hep-ph
| null |
Brannen has recently pointed out that the observed charged lepton masses
satisfy the relation m_e +m_\mu +m_\tau = {2/3}
(\sqrt{m_e}+\sqrt{m_\mu}+\sqrt{m_\tau})^2, while the observed neutrino masses
satisfy the relation m_{\nu 1} +m_{\nu 2} +m_{\nu 3} = {2/3} (-\sqrt{m_{\nu
1}}+\sqrt{m_{\nu 2}}+\sqrt{m_{\nu 3}})^2. It is discussed what neutrino Yukawa
interaction form is favorable if we take the fact pointed out by Brannen
seriously.
|
[
{
"created": "Mon, 8 May 2006 04:41:48 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Aug 2006 11:22:04 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Koide",
"Yoshio",
""
]
] |
Brannen has recently pointed out that the observed charged lepton masses satisfy the relation m_e +m_\mu +m_\tau = {2/3} (\sqrt{m_e}+\sqrt{m_\mu}+\sqrt{m_\tau})^2, while the observed neutrino masses satisfy the relation m_{\nu 1} +m_{\nu 2} +m_{\nu 3} = {2/3} (-\sqrt{m_{\nu 1}}+\sqrt{m_{\nu 2}}+\sqrt{m_{\nu 3}})^2. It is discussed what neutrino Yukawa interaction form is favorable if we take the fact pointed out by Brannen seriously.
|
1611.00771
|
Bibhushan Shakya
|
Aaron Pierce and Bibhushan Shakya
|
Implications of a Stop Sector Signal at the LHC
|
30 pages, 8 figures. Discussions, analyses, and benchmark points
updated relative to v1 to incorporate the latest LHC constraints. version
accepted for publication in JHEP
| null | null |
MCTP-16-25
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Naturalness arguments suggest that the stop sector is within reach of the
Large Hadron Collider (LHC). We investigate how the observation of a third
generation squark signal could predict masses and discovery modes of other
supersymmetric particles, or potentially test the Higgs boson mass relation and
the validity of the Minimal Supersymmetric Standard Model (MSSM) at the high
luminosity LHC. We illustrate these ideas in three distinct scenarios:
discovery of a light stop, a sbottom signal in multileptons, and a signal of
the second (heavier) stop in boosted dibosons.
|
[
{
"created": "Wed, 2 Nov 2016 20:00:03 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Jun 2018 14:55:47 GMT",
"version": "v2"
}
] |
2018-06-15
|
[
[
"Pierce",
"Aaron",
""
],
[
"Shakya",
"Bibhushan",
""
]
] |
Naturalness arguments suggest that the stop sector is within reach of the Large Hadron Collider (LHC). We investigate how the observation of a third generation squark signal could predict masses and discovery modes of other supersymmetric particles, or potentially test the Higgs boson mass relation and the validity of the Minimal Supersymmetric Standard Model (MSSM) at the high luminosity LHC. We illustrate these ideas in three distinct scenarios: discovery of a light stop, a sbottom signal in multileptons, and a signal of the second (heavier) stop in boosted dibosons.
|
2211.10185
|
Rafael L. Delgado
|
Rafael L. Delgado, Sebastian Steinbei{\ss}er, Michael Strickland and
Johannes H. Weber
|
QuantumFDTD -- A computational framework for the relativistic
Schr\"odinger equation
|
7 pages, 2 figures, Contribution to the proceedings of the XVth Quark
Confinement and the Hadron Spectrum (CONF15). Aug. 1 - 6, 2022. Stavanger,
Norway
|
EPJ Web Conf. 274 (2022) 04004
|
10.1051/epjconf/202227404004
| null |
hep-ph hep-lat physics.comp-ph quant-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We extend the publicly available quantumfdtd code. It was originally intended
for solving the time-independent three-dimensional Schr\"odinger equation via
the finite-difference time-domain (FDTD) method and for extracting the ground,
first, and second excited states. We (a) include the case of the relativistic
Schr\"odinger equation and (b) add two optimized FFT-based kinetic energy terms
for the non-relativistic case. All the three new kinetic terms are computed
using Fast Fourier Transform (FFT). We release the resulting code as version 3
of quantumfdtd. Finally, the code now supports arbitrary external file-based
potentials and the option to project out distinct parity eigenstates from the
solutions. Our goal is quark models used for phenomenological descriptions of
QCD bound states, described by the three-dimensional Schr\"odinger equation.
However, we target any field where solving either the non-relativistic or the
relativistic three-dimensional Schr\"odinger equation is required.
|
[
{
"created": "Fri, 18 Nov 2022 12:09:43 GMT",
"version": "v1"
}
] |
2023-01-02
|
[
[
"Delgado",
"Rafael L.",
""
],
[
"Steinbeißer",
"Sebastian",
""
],
[
"Strickland",
"Michael",
""
],
[
"Weber",
"Johannes H.",
""
]
] |
We extend the publicly available quantumfdtd code. It was originally intended for solving the time-independent three-dimensional Schr\"odinger equation via the finite-difference time-domain (FDTD) method and for extracting the ground, first, and second excited states. We (a) include the case of the relativistic Schr\"odinger equation and (b) add two optimized FFT-based kinetic energy terms for the non-relativistic case. All the three new kinetic terms are computed using Fast Fourier Transform (FFT). We release the resulting code as version 3 of quantumfdtd. Finally, the code now supports arbitrary external file-based potentials and the option to project out distinct parity eigenstates from the solutions. Our goal is quark models used for phenomenological descriptions of QCD bound states, described by the three-dimensional Schr\"odinger equation. However, we target any field where solving either the non-relativistic or the relativistic three-dimensional Schr\"odinger equation is required.
|
1907.04684
|
Makoto Takizawa
|
Yasuhiro Yamaguchi, Hugo Garcia-Tecocoatzi, Alessandro Giachino,
Atsushi Hosaka, Elena Santopinto, Sachiko Takeuchi, Makoto Takizawa
|
$P_c$ pentaquarks with chiral tensor and quark dynamics
|
6 pages, 2 figures
|
Phys. Rev. D 101, 091502 (2020)
|
10.1103/PhysRevD.101.091502
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the hidden-charm pentaquarks as superpositions of $\Lambda_c
\bar{D}^{(*)}$ and $\Sigma_c^{(*)} \bar{D}^{(*)}$ (isospin $I = 1/2$)
meson-baryon channels coupled to a $uudc\bar{c}$ compact core by employing an
interaction satisfying the heavy quark and chiral symmetries. Our model can
consistently explain the masses and decay widths of $P_c^+(4312)$,
$P_c^+(4440)$ and $P_c^+(4457)$ with the dominant components of $\Sigma_c \bar
D$ and $\Sigma_c \bar D^\ast$ with spin parity assignments $J^P = 1/2^{-},
3/2^{-}$ and $1/2^{-}$, respectively. We analyze basic properties of the
$P_c$'s such as masses and decay widths, and find that the mass ordering is
dominantly determined by the quark dynamics while the decay widths by the
tensor force of the one-pion exchange.
|
[
{
"created": "Wed, 10 Jul 2019 12:56:09 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Mar 2020 04:42:26 GMT",
"version": "v2"
},
{
"created": "Thu, 19 Mar 2020 11:51:47 GMT",
"version": "v3"
}
] |
2020-05-13
|
[
[
"Yamaguchi",
"Yasuhiro",
""
],
[
"Garcia-Tecocoatzi",
"Hugo",
""
],
[
"Giachino",
"Alessandro",
""
],
[
"Hosaka",
"Atsushi",
""
],
[
"Santopinto",
"Elena",
""
],
[
"Takeuchi",
"Sachiko",
""
],
[
"Takizawa",
"Makoto",
""
]
] |
We investigate the hidden-charm pentaquarks as superpositions of $\Lambda_c \bar{D}^{(*)}$ and $\Sigma_c^{(*)} \bar{D}^{(*)}$ (isospin $I = 1/2$) meson-baryon channels coupled to a $uudc\bar{c}$ compact core by employing an interaction satisfying the heavy quark and chiral symmetries. Our model can consistently explain the masses and decay widths of $P_c^+(4312)$, $P_c^+(4440)$ and $P_c^+(4457)$ with the dominant components of $\Sigma_c \bar D$ and $\Sigma_c \bar D^\ast$ with spin parity assignments $J^P = 1/2^{-}, 3/2^{-}$ and $1/2^{-}$, respectively. We analyze basic properties of the $P_c$'s such as masses and decay widths, and find that the mass ordering is dominantly determined by the quark dynamics while the decay widths by the tensor force of the one-pion exchange.
|
2305.16388
|
Yong Xu
|
Basabendu Barman, Nicol\'as Bernal, Yong Xu, and \'Oscar Zapata
|
Bremsstrahlung-induced Gravitational Waves in Monomial Potentials during
Reheating
|
V1: 22 pages, 4 figures, comments welcome; V2: minor change with
footnote 4, version accepted for publication in PRD
| null | null | null |
hep-ph astro-ph.CO
|
http://creativecommons.org/licenses/by/4.0/
|
We discuss the production of primordial gravitational waves (GW) from
radiative inflaton decay during the period of reheating, assuming perturbative
decay of the inflaton either into a pair of bosons or fermions, leading to
successful reheating satisfying constraint from Big Bang nucleosynthesis.
Assuming that the inflaton $\phi$ oscillates in a general monomial potential
$V(\phi)\propto \phi^n$, which results in a time-dependent inflaton decay
width, we show that the resulting stochastic GW background can have optimistic
detection prospects, especially in detectors that search for a high-frequency
GW spectrum, depending on the choice of $n$ that determines the shape of the
potential during reheating. We also discuss how this GW energy density may
affect the measurement of $\Delta N_{\text{eff}}$ for bosonic and fermionic
reheating scenarios.
|
[
{
"created": "Thu, 25 May 2023 18:00:03 GMT",
"version": "v1"
},
{
"created": "Sat, 23 Sep 2023 22:17:52 GMT",
"version": "v2"
}
] |
2023-09-26
|
[
[
"Barman",
"Basabendu",
""
],
[
"Bernal",
"Nicolás",
""
],
[
"Xu",
"Yong",
""
],
[
"Zapata",
"Óscar",
""
]
] |
We discuss the production of primordial gravitational waves (GW) from radiative inflaton decay during the period of reheating, assuming perturbative decay of the inflaton either into a pair of bosons or fermions, leading to successful reheating satisfying constraint from Big Bang nucleosynthesis. Assuming that the inflaton $\phi$ oscillates in a general monomial potential $V(\phi)\propto \phi^n$, which results in a time-dependent inflaton decay width, we show that the resulting stochastic GW background can have optimistic detection prospects, especially in detectors that search for a high-frequency GW spectrum, depending on the choice of $n$ that determines the shape of the potential during reheating. We also discuss how this GW energy density may affect the measurement of $\Delta N_{\text{eff}}$ for bosonic and fermionic reheating scenarios.
|
hep-ph/0106251
|
Kingman Cheung
|
Kingman Cheung (NCTS)
|
Constraints on Electron-quark Contact Interactions and Implications to
models of leptoquarks and Extra Z Bosons
|
10 pages, a clarification of notation and a reference are added
|
Phys.Lett.B517:167-176,2001
|
10.1016/S0370-2693(01)00973-X
|
NSC-NCTS-010622
|
hep-ph hep-ex
| null |
We update the global constraint on four-fermion $ee q q$ contact
interactions. In this update, we included the published data of H1 and ZEUS for
the 94--96 run in the $e^+ p$ mode and the newly published data of H1 for the
1999 run in the $e^- p$ mode. Other major changes are the new LEPII data on
hadronic cross sections above 189 GeV, and the atomic parity violation
measurement on Cesium because of a new and improved atomic calculation, which
drives the data within $1\sigma$ of the standard model value. The global data
do not show any evidence for contact interactions, and we obtain 95% C.L.
limits on the compositeness scale. A limit of $\Lambda^{eu}_{LL+(-)} > 23
(12.5)$ TeV is obtained. Implications to models of leptoquarks and extra Z
bosons are examined.
|
[
{
"created": "Fri, 22 Jun 2001 07:43:19 GMT",
"version": "v1"
},
{
"created": "Sat, 21 Jul 2001 19:34:57 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Cheung",
"Kingman",
"",
"NCTS"
]
] |
We update the global constraint on four-fermion $ee q q$ contact interactions. In this update, we included the published data of H1 and ZEUS for the 94--96 run in the $e^+ p$ mode and the newly published data of H1 for the 1999 run in the $e^- p$ mode. Other major changes are the new LEPII data on hadronic cross sections above 189 GeV, and the atomic parity violation measurement on Cesium because of a new and improved atomic calculation, which drives the data within $1\sigma$ of the standard model value. The global data do not show any evidence for contact interactions, and we obtain 95% C.L. limits on the compositeness scale. A limit of $\Lambda^{eu}_{LL+(-)} > 23 (12.5)$ TeV is obtained. Implications to models of leptoquarks and extra Z bosons are examined.
|
1206.4445
|
Alexandra Gurinovich
|
V. G. Baryshevsky and A. R. Bartkevich
|
Tensor polarization of deuterons passing through matter
|
18 pages, 3 figures, to be published in IOP
| null |
10.1088/0954-3899/39/12/125002
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
It is shown that the magnitude of tensor polarization of the deuteron beam,
which arises owing to the spin dichroism effect, depends appreciably on the
angular width of the detector that registers the deuterons transmitted through
the target. Even when the angular width of the detector is much smaller than
the mean square angle of multiple Coulomb scattering, the beam's tensor
polarization depends noticeably on rescattering. When the angular width of the
detector is much larger than the mean square angle of multiple Coulomb
scattering (as well as than the characteristic angle of elastic nuclear
scattering), tensor polarization is determined only by the total reaction cross
sections for deuteron-nucleus interaction, and elastic scattering processes
make no contribution to tensor polarization.
|
[
{
"created": "Wed, 20 Jun 2012 10:23:59 GMT",
"version": "v1"
}
] |
2015-06-05
|
[
[
"Baryshevsky",
"V. G.",
""
],
[
"Bartkevich",
"A. R.",
""
]
] |
It is shown that the magnitude of tensor polarization of the deuteron beam, which arises owing to the spin dichroism effect, depends appreciably on the angular width of the detector that registers the deuterons transmitted through the target. Even when the angular width of the detector is much smaller than the mean square angle of multiple Coulomb scattering, the beam's tensor polarization depends noticeably on rescattering. When the angular width of the detector is much larger than the mean square angle of multiple Coulomb scattering (as well as than the characteristic angle of elastic nuclear scattering), tensor polarization is determined only by the total reaction cross sections for deuteron-nucleus interaction, and elastic scattering processes make no contribution to tensor polarization.
|
hep-ph/0702148
|
Vladimir Kuksa
|
V.A. Beylin, V.I. Kuksa, R.S. Pasechnik, G.M. Vereshkov
|
Diagonalization of the neutralino mass matrix and boson-neutralino
interaction
|
21 pages, RevTex4
|
Eur.Phys.J.C56:395-405,2008
|
10.1140/epjc/s10052-008-0660-0
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We analyze a connection between neutralino mass sign, parity and structure of
the neutralino-boson interaction. Correct calculation of spin-dependent and
spin-independent contributions to neutralino-nuclear scattering should consider
this connection. A convenient diagonalization procedure, based on the
exponetial parametrization of unitary matrix, is suggested.
|
[
{
"created": "Thu, 15 Feb 2007 08:02:22 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Mar 2007 14:12:34 GMT",
"version": "v2"
},
{
"created": "Wed, 8 Oct 2008 18:01:28 GMT",
"version": "v3"
}
] |
2014-11-18
|
[
[
"Beylin",
"V. A.",
""
],
[
"Kuksa",
"V. I.",
""
],
[
"Pasechnik",
"R. S.",
""
],
[
"Vereshkov",
"G. M.",
""
]
] |
We analyze a connection between neutralino mass sign, parity and structure of the neutralino-boson interaction. Correct calculation of spin-dependent and spin-independent contributions to neutralino-nuclear scattering should consider this connection. A convenient diagonalization procedure, based on the exponetial parametrization of unitary matrix, is suggested.
|
hep-ph/9906444
|
Christian Weiss
|
B. Dressler, M. Maul, and C. Weiss
|
Twist-4 contribution to unpolarized structure functions F_L and F_2 from
instantons
|
38 pages, LaTeX. 4 figures included using epsf
|
Nucl.Phys. B578 (2000) 293-325
|
10.1016/S0550-3213(00)00024-9
|
RUB-TPII-5/99
|
hep-ph
| null |
We compute in the instanton vacuum the nucleon matrix elements of the twist-4
QCD operators describing power corrections to the second moments of the
unpolarized structure functions, F_L and F_2. Our approach takes into account
the leading contribution in the packing fraction of the instanton medium, rho /
R << 1. Parametrically leading are the matrix elements of a twist-4 quark-gluon
operator, which are of the order of the inverse instanton size, 1/rho^2 = (600
MeV)^2. The matrix elements of the four-fermion (diquark) operators are
suppressed by a factor (rho / R)^4 and numerically small. These results are in
agreement with the pattern of phenomenological 1/Q^2-corrections to R = sigma_L
/ sigma_T and F_2 found in QCD fits to the data. In particular, the rise of R
at low Q^2 can be obtained from instanton-type vacuum fluctuations at a low
scale.
|
[
{
"created": "Wed, 23 Jun 1999 01:28:57 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Dressler",
"B.",
""
],
[
"Maul",
"M.",
""
],
[
"Weiss",
"C.",
""
]
] |
We compute in the instanton vacuum the nucleon matrix elements of the twist-4 QCD operators describing power corrections to the second moments of the unpolarized structure functions, F_L and F_2. Our approach takes into account the leading contribution in the packing fraction of the instanton medium, rho / R << 1. Parametrically leading are the matrix elements of a twist-4 quark-gluon operator, which are of the order of the inverse instanton size, 1/rho^2 = (600 MeV)^2. The matrix elements of the four-fermion (diquark) operators are suppressed by a factor (rho / R)^4 and numerically small. These results are in agreement with the pattern of phenomenological 1/Q^2-corrections to R = sigma_L / sigma_T and F_2 found in QCD fits to the data. In particular, the rise of R at low Q^2 can be obtained from instanton-type vacuum fluctuations at a low scale.
|
1206.6057
|
John R. Hiller
|
J. R. Hiller
|
A light-front coupled-cluster method for quantum field theories
|
6 pages, to appear in the proceedings of the Sixth International
Conference on Quarks and Nuclear Physics, April 16-20, 2012, Ecole
Polytechnique, Palaiseau, Paris
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The Hamiltonian eigenvalue problem for bound states of a quantum field theory
is formulated in terms of Dirac's light-front coordinates and then approximated
by the exponential-operator technique of the standard coupled-cluster method.
This approximation eliminates any need for the usual approximation of
Fock-space truncation. Instead, the exponential operator is truncated and the
terms retained are determined by a set of nonlinear integral equations. These
equations are solved simultaneously with an effective eigenvalue problem in the
valence sector, where the number of constituents is small. Matrix elements can
be calculated, with extensions of techniques from standard coupled-cluster
theory.
|
[
{
"created": "Tue, 26 Jun 2012 17:24:34 GMT",
"version": "v1"
}
] |
2012-06-27
|
[
[
"Hiller",
"J. R.",
""
]
] |
The Hamiltonian eigenvalue problem for bound states of a quantum field theory is formulated in terms of Dirac's light-front coordinates and then approximated by the exponential-operator technique of the standard coupled-cluster method. This approximation eliminates any need for the usual approximation of Fock-space truncation. Instead, the exponential operator is truncated and the terms retained are determined by a set of nonlinear integral equations. These equations are solved simultaneously with an effective eigenvalue problem in the valence sector, where the number of constituents is small. Matrix elements can be calculated, with extensions of techniques from standard coupled-cluster theory.
|
1511.04099
|
Kohsaku Tobioka
|
Kohsaku Tobioka
|
Aspects of Supersymmetry after LHC Run I
|
144 pages, 49 figures, 9 tables, Ph. D thesis submitted in March,
2014
| null | null | null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Supersymmetry is a prime candidate for physics beyond the Standard Model
because low-energy supersymmetry stabilizes the Higgs mass avoiding fine-tuning
and leads to natural electroweak symmetry breaking. However, searches at the
Large Hadron Collider (LHC) for supersymmetric particles have not found any
signal and give strong limits on mass of gluino and squark. Also, the observed
Higgs mass of 125 GeV is not easily accommodated in the minimal supersymmetric
Standard Model (MSSM) where one has to rely on the radiative corrections to
boost the Higgs mass accompanied with fine-tuning. I study aspects of
supersymmetry in light of these LHC results. In this thesis, I focus on the
Compact Supersymmetry model based on arXiv:1206.4993 and the Dirac Next-to-MSSM
based on arXiv:1308.0792 and investigate them in more detail.
|
[
{
"created": "Thu, 12 Nov 2015 21:28:02 GMT",
"version": "v1"
}
] |
2015-11-16
|
[
[
"Tobioka",
"Kohsaku",
""
]
] |
Supersymmetry is a prime candidate for physics beyond the Standard Model because low-energy supersymmetry stabilizes the Higgs mass avoiding fine-tuning and leads to natural electroweak symmetry breaking. However, searches at the Large Hadron Collider (LHC) for supersymmetric particles have not found any signal and give strong limits on mass of gluino and squark. Also, the observed Higgs mass of 125 GeV is not easily accommodated in the minimal supersymmetric Standard Model (MSSM) where one has to rely on the radiative corrections to boost the Higgs mass accompanied with fine-tuning. I study aspects of supersymmetry in light of these LHC results. In this thesis, I focus on the Compact Supersymmetry model based on arXiv:1206.4993 and the Dirac Next-to-MSSM based on arXiv:1308.0792 and investigate them in more detail.
|
hep-ph/9612327
| null |
Jonathan L. Rosner (University of Chicago)
|
CKM Matrix and Standard-Model CP Violation
|
16 pages, latex, 8 figures. Invited talk at Fourth KEK Topical
Conference on Flavour Physics, 29 -- 31 October 1996. To be published in
Nucl. Phys. B (Proc. Suppl.)
|
Nucl.Phys.Proc.Suppl.59:1-16,1997
|
10.1016/S0920-5632(97)00423-4
|
EFI-96-46
|
hep-ph
| null |
The currently favored model of CP violation is based on phases in the
Cabibbo-Kobayashi-Maskawa (CKM) matrix describing the weak charge-changing
couplings of quarks. The present status of parameters of this matrix is
described. Tests of the theory, with particular emphasis on the study of B
meson decays, are then noted. Some remarks are made regarding the possible
origin of the baryon asymmetry of the universe; the corresponding coupling
pattern of the leptons could shed light on the question. Some possibilities for
non-standard physics are discussed.
|
[
{
"created": "Wed, 11 Dec 1996 16:35:47 GMT",
"version": "v1"
}
] |
2014-11-17
|
[
[
"Rosner",
"Jonathan L.",
"",
"University of Chicago"
]
] |
The currently favored model of CP violation is based on phases in the Cabibbo-Kobayashi-Maskawa (CKM) matrix describing the weak charge-changing couplings of quarks. The present status of parameters of this matrix is described. Tests of the theory, with particular emphasis on the study of B meson decays, are then noted. Some remarks are made regarding the possible origin of the baryon asymmetry of the universe; the corresponding coupling pattern of the leptons could shed light on the question. Some possibilities for non-standard physics are discussed.
|
hep-ph/0506194
|
Jun-Chen Su
|
Jun-Chen Su
|
Dirac-Schr\"odinger equation for quark-antiquark bound states and
derivation of its interaction kerne
| null |
J.Phys. G30 (2004) 1309-1352
|
10.1088/0954-3899/30/10/001
| null |
hep-ph
| null |
The four-dimensional Dirac-Schr\"odinger equation satisfied by
quark-antiquark bound states is derived from Quantum Chromodynamics. Different
from the Bethe-Salpeter equation, the equation derived is a kind of first-order
differential equations of Schr\"odinger-type in the position space. Especially,
the interaction kernel in the equation is given by two different closed
expressions. One expression which contains only a few types of Green's
functions is derived with the aid of the equations of motion satisfied by some
kinds of Green's functions. Another expression which is represented in terms of
the quark, antiquark and gluon propagators and some kinds of proper vertices is
derived by means of the technique of irreducible decomposition of Green's
functions. The kernel derived not only can easily be calculated by the
perturbation method, but also provides a suitable basis for nonperturbative
investigations. Furthermore, it is shown that the four-dimensinal
Dirac-Schr\"odinger equation and its kernel can directly be reduced to rigorous
three-dimensional forms in the equal-time Lorentz frame and the
Dirac-Schr\"odinger equation can be reduced to an equivalent
Pauli-Schr\"odinger equation which is represented in the Pauli spinor space. To
show the applicability of the closed expressions derived and to demonstrate the
equivalence between the two different expressions of the kernel, the t-channel
and s-channel one gluon exchange kernels are chosen as an example to show how
they are derived from the closed expressions. In addition, the connection of
the Dirac-Schr\"odinger equation with the Bethe-Salpeter equation is discussed.
|
[
{
"created": "Mon, 20 Jun 2005 08:16:19 GMT",
"version": "v1"
}
] |
2009-11-11
|
[
[
"Su",
"Jun-Chen",
""
]
] |
The four-dimensional Dirac-Schr\"odinger equation satisfied by quark-antiquark bound states is derived from Quantum Chromodynamics. Different from the Bethe-Salpeter equation, the equation derived is a kind of first-order differential equations of Schr\"odinger-type in the position space. Especially, the interaction kernel in the equation is given by two different closed expressions. One expression which contains only a few types of Green's functions is derived with the aid of the equations of motion satisfied by some kinds of Green's functions. Another expression which is represented in terms of the quark, antiquark and gluon propagators and some kinds of proper vertices is derived by means of the technique of irreducible decomposition of Green's functions. The kernel derived not only can easily be calculated by the perturbation method, but also provides a suitable basis for nonperturbative investigations. Furthermore, it is shown that the four-dimensinal Dirac-Schr\"odinger equation and its kernel can directly be reduced to rigorous three-dimensional forms in the equal-time Lorentz frame and the Dirac-Schr\"odinger equation can be reduced to an equivalent Pauli-Schr\"odinger equation which is represented in the Pauli spinor space. To show the applicability of the closed expressions derived and to demonstrate the equivalence between the two different expressions of the kernel, the t-channel and s-channel one gluon exchange kernels are chosen as an example to show how they are derived from the closed expressions. In addition, the connection of the Dirac-Schr\"odinger equation with the Bethe-Salpeter equation is discussed.
|
hep-ph/0005209
|
Matthias Burkardt
|
Matthias Burkardt (New Mexico State University)
|
Off-Forward Parton Distributions in 1+1 Dimensional QCD
|
Revtex, 6 pages, 4 figures
|
Phys.Rev. D62 (2000) 094003
|
10.1103/PhysRevD.62.094003
| null |
hep-ph
| null |
We use two-dimensional QCD as a toy laboratory to study off-forward parton
distributions (OFPDs) in a covariant field theory. Exact expressions (to
leading order in $1/N_C$) are presented for OFPDs in this model and are
evaluated for some specific numerical examples. Special emphasis is put on
comparing the $x>\zeta$ and $x<\zeta$ regimes as well as on analyzing the
implications for the light-cone description of form factors.
|
[
{
"created": "Mon, 22 May 2000 16:07:34 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Burkardt",
"Matthias",
"",
"New Mexico State University"
]
] |
We use two-dimensional QCD as a toy laboratory to study off-forward parton distributions (OFPDs) in a covariant field theory. Exact expressions (to leading order in $1/N_C$) are presented for OFPDs in this model and are evaluated for some specific numerical examples. Special emphasis is put on comparing the $x>\zeta$ and $x<\zeta$ regimes as well as on analyzing the implications for the light-cone description of form factors.
|
hep-ph/9812265
|
Masashi Wakamatsu Ohtsubo Laboratory
|
M. Wakamatsu (Osaka Univ.)
|
Chiral Symmetry and the Nucleon Spin Structure Functions
|
8 pages, including 8 eps figures included with epsf.sty, Invited talk
at the XIV International Seminar on High Energy Physics Problems
``Relativistic Nuclear Physics and Quantum Chromodynamics'', Dubna, 17-22
August, 1998
| null | null |
OU-HET-311
|
hep-ph
| null |
We carry out a systematic investigation of twist-two spin dependent structure
functions of the nucleon within the framework of the chiral quark soliton model
(CQSM) by paying special attention to the role of chiral symmetry of QCD. We
observe a substantial difference between the predictions of the longitudinally
polarized distribution functions and the transversity distribution ones. That
the chiral symmetry is responsible for this difference can most clearly be seen
in the isospin dependence of the corresponding first moments, i.e. the axial
and tensor charges. The CQSM predicts $g_A^{(0)} / g_A^{(3)} \simeq 0.25$ for
the ratio of the isoscalar to isovector axial charges, and $g_T^{(0)} /
g_T^{(3)} \simeq 0.46$ for the ratio of the isoscalar to isovector tensor
charges, which should be compared with the prediction of the naive (non-chiral)
MIT bag model, $g_A^{(0)} / g_A^{(3)} = g_T^{(0)} / g_T^{(3)} = 3 / 5$.
|
[
{
"created": "Mon, 7 Dec 1998 05:33:40 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Wakamatsu",
"M.",
"",
"Osaka Univ."
]
] |
We carry out a systematic investigation of twist-two spin dependent structure functions of the nucleon within the framework of the chiral quark soliton model (CQSM) by paying special attention to the role of chiral symmetry of QCD. We observe a substantial difference between the predictions of the longitudinally polarized distribution functions and the transversity distribution ones. That the chiral symmetry is responsible for this difference can most clearly be seen in the isospin dependence of the corresponding first moments, i.e. the axial and tensor charges. The CQSM predicts $g_A^{(0)} / g_A^{(3)} \simeq 0.25$ for the ratio of the isoscalar to isovector axial charges, and $g_T^{(0)} / g_T^{(3)} \simeq 0.46$ for the ratio of the isoscalar to isovector tensor charges, which should be compared with the prediction of the naive (non-chiral) MIT bag model, $g_A^{(0)} / g_A^{(3)} = g_T^{(0)} / g_T^{(3)} = 3 / 5$.
|
2109.09826
|
Wei Zhu
|
Wei Zhu, Zhiyi Cui and Jianhong Ruan
|
Warning: The mini gamma-ray-bursts in planning hadron colliders beyond
the LHC energies
|
text is overlapped by arXiv:2208.14219
| null | null | null |
hep-ph astro-ph.HE hep-ex nucl-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Gluons may converge to a stable state at a critical momentum in nucleon. This
gluon condensation will greatly increase the proton-proton cross section
provided that the collision energies exceed the gluon condensation threshold.
Based on the analyses of cosmic gamma-ray spectra, we find that the $p-Pb$ and
$Pb-Pb$ collisions at the LHC are close to the energy region of the gluon
condensation effect. We warn that for the next generation of hadron colliders
increasing the collision energies, the extremely strong gamma-rays will be
emitted in a narrow space of the accelerator due to the gluon condensation
effect. Such artificial mini gamma-ray-bursts in the laboratory may damage the
detectors.
|
[
{
"created": "Mon, 20 Sep 2021 20:17:21 GMT",
"version": "v1"
},
{
"created": "Wed, 31 Aug 2022 02:55:31 GMT",
"version": "v2"
}
] |
2022-09-01
|
[
[
"Zhu",
"Wei",
""
],
[
"Cui",
"Zhiyi",
""
],
[
"Ruan",
"Jianhong",
""
]
] |
Gluons may converge to a stable state at a critical momentum in nucleon. This gluon condensation will greatly increase the proton-proton cross section provided that the collision energies exceed the gluon condensation threshold. Based on the analyses of cosmic gamma-ray spectra, we find that the $p-Pb$ and $Pb-Pb$ collisions at the LHC are close to the energy region of the gluon condensation effect. We warn that for the next generation of hadron colliders increasing the collision energies, the extremely strong gamma-rays will be emitted in a narrow space of the accelerator due to the gluon condensation effect. Such artificial mini gamma-ray-bursts in the laboratory may damage the detectors.
|
1311.4917
|
Leo Medeiros Gouvea
|
P. Niau Akmansoy, L. G. Medeiros
|
Thermodynamics of a Photon Gas in Nonlinear Electrodynamics
|
7 pages, 1 figures. A new section about H.E. effective action added
in this version. Accepted PLB
|
Phys. Lett. B 738, 317 (2014)
|
10.1016/j.physletb.2014.10.003
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper we analyze the thermodynamic properties of a photon gas under
the influence of a background electromagnetic field in the context of any
nonlinear electrodynamics. Neglecting the self-interaction of photons, we
obtain a general expression for the grand canonical potential. Particularizing
for the case when the background field is uniform, we determine the pressure
and the energy density for the photon gas. Although the pressure and the energy
density change when compared with the standard case, the relationship between
them remains unaltered, namely $\rho=3p$. Finally, we apply the developed
formulation to the cases of Heisenberg-Euler and Born-Infeld nonlinear
electrodynamics. For the Heisenberg-Euler case, we show that our formalism
recover the results obtained with the $2$-loop thermal effective action
approach.
|
[
{
"created": "Tue, 19 Nov 2013 23:24:26 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Oct 2014 05:11:43 GMT",
"version": "v2"
}
] |
2015-06-17
|
[
[
"Akmansoy",
"P. Niau",
""
],
[
"Medeiros",
"L. G.",
""
]
] |
In this paper we analyze the thermodynamic properties of a photon gas under the influence of a background electromagnetic field in the context of any nonlinear electrodynamics. Neglecting the self-interaction of photons, we obtain a general expression for the grand canonical potential. Particularizing for the case when the background field is uniform, we determine the pressure and the energy density for the photon gas. Although the pressure and the energy density change when compared with the standard case, the relationship between them remains unaltered, namely $\rho=3p$. Finally, we apply the developed formulation to the cases of Heisenberg-Euler and Born-Infeld nonlinear electrodynamics. For the Heisenberg-Euler case, we show that our formalism recover the results obtained with the $2$-loop thermal effective action approach.
|
2406.17481
|
Ju-Jun Xie
|
Ju-Jun Xie and Li-Sheng Geng
|
The $\Omega(2012)$ as a hadronic molecule
|
Mini-review on the $\Omega(2012)$ state from the molecular
perspective. Accepted by the Chinese Physics Letters
| null | null | null |
hep-ph nucl-th
|
http://creativecommons.org/licenses/by/4.0/
|
Recently, a new excited baryon state, $\Omega(2012)$, was observed in the
invariant mass spectra of $K^-\Xi^0$ and $K^0_S \Xi^-$ by the Belle
Collaboration. This state has a narrow width ($\sim 6$ MeV) compared to other
baryon states with a similar mass. In this paper, we provide a mini-review on
the $\Omega(2012)$ state from the molecular perspective, where it appears to be
a dynamically generated state with spin-parity $3/2^-$ from the
coupled-channels interactions of the $\bar{K} \Xi(1530)$ and $\eta \Omega$ in
$s$-wave and $\bar{K} \Xi$ in $d$-wave. Additionally, alternative explanations
for the $\Omega(2012)$ resonance are also discussed.
|
[
{
"created": "Tue, 25 Jun 2024 11:57:29 GMT",
"version": "v1"
}
] |
2024-06-26
|
[
[
"Xie",
"Ju-Jun",
""
],
[
"Geng",
"Li-Sheng",
""
]
] |
Recently, a new excited baryon state, $\Omega(2012)$, was observed in the invariant mass spectra of $K^-\Xi^0$ and $K^0_S \Xi^-$ by the Belle Collaboration. This state has a narrow width ($\sim 6$ MeV) compared to other baryon states with a similar mass. In this paper, we provide a mini-review on the $\Omega(2012)$ state from the molecular perspective, where it appears to be a dynamically generated state with spin-parity $3/2^-$ from the coupled-channels interactions of the $\bar{K} \Xi(1530)$ and $\eta \Omega$ in $s$-wave and $\bar{K} \Xi$ in $d$-wave. Additionally, alternative explanations for the $\Omega(2012)$ resonance are also discussed.
|
hep-ph/9507462
|
Alex Pomarol
|
Alex Pomarol and Daniele Tommasini (CERN)
|
Horizontal Symmetries for the Supersymmetric Flavor Problem
|
22 pages, LaTex. Minor changes. Version to appear in Nucl. Phys. B
|
Nucl.Phys. B466 (1996) 3-24
|
10.1016/0550-3213(96)00074-0
|
CERN-TH/95-207
|
hep-ph
| null |
The heaviness of the third family fermions and the experimental absence of
large flavor violating processes suggest, in supersymmetric theories, that the
three families belong to a $2+1$ representation of a horizontal symmetry $G_H$.
In this framework, we discuss a class of models based on the group U(2) that
describe the fermion flavor structure and are compatible with an underlying
GUT. We study the phenomenology of these models and focus on two interesting
scenarios: In the first one, the first and second family scalars are assumed to
be heavier than the weak scale allowing for complex soft supersymmetry breaking
terms. In the second one, all the CP-violating phases are assumed to be small.
Both scenarios present a rich phenomenology in agreement with constraints from
flavor violating processes and electric dipole moments.
|
[
{
"created": "Mon, 31 Jul 1995 19:42:56 GMT",
"version": "v1"
},
{
"created": "Fri, 23 Feb 1996 18:09:13 GMT",
"version": "v2"
}
] |
2009-10-28
|
[
[
"Pomarol",
"Alex",
"",
"CERN"
],
[
"Tommasini",
"Daniele",
"",
"CERN"
]
] |
The heaviness of the third family fermions and the experimental absence of large flavor violating processes suggest, in supersymmetric theories, that the three families belong to a $2+1$ representation of a horizontal symmetry $G_H$. In this framework, we discuss a class of models based on the group U(2) that describe the fermion flavor structure and are compatible with an underlying GUT. We study the phenomenology of these models and focus on two interesting scenarios: In the first one, the first and second family scalars are assumed to be heavier than the weak scale allowing for complex soft supersymmetry breaking terms. In the second one, all the CP-violating phases are assumed to be small. Both scenarios present a rich phenomenology in agreement with constraints from flavor violating processes and electric dipole moments.
|
hep-ph/0411078
|
Yue-Liang Wu
|
Yong-Liang Ma, Qing Wang and Yue-Liang Wu
|
Hidden Local Symmetry and Chiral Effective Theory for Vector and
Axial-vector Mesons
|
RevTex, 18 pages, to be published in EPJC
|
Eur.Phys.J. C39 (2005) 201-208
|
10.1140/epjc/s2004-02076-y
| null |
hep-ph
| null |
In this paper, we present the full Lagrangian of mesons (pseudoscalars,
vectors and axial-vectors) to $O(p^4)$ by using the explicit global chiral
symmetry and hidden local symmetry in the chiral limit. In this approach, we
see that there are many other terms besides the usual eleven terms given in the
literature from hidden local symmetry approach. Of particular, there are some
terms in our full results which are important for understanding the vector
meson dominance and $\pi-\pi$ scattering and providing consistent predictions
on the decay rates of $a_1\to\gamma\pi$ and $a_1\to\rho\pi$ as well as for
constructing a consistent effective chiral Lagrangian with chiral perturbation
theory. It is likely that the structures of the effective chiral Lagrangian for
$O(p^4)$ given in the literature by using hidden local symmetry are incomplete
and consequently the resulting couplings are not reliable. It is examined that
the more general effective chiral Lagrangian given in present paper can provide
more consistent predictions for the low energy phenomenology of $\rho-a_1$
system and result in more consistent descriptions on the low energy behavior of
light flavor mesons.
|
[
{
"created": "Fri, 5 Nov 2004 06:03:56 GMT",
"version": "v1"
}
] |
2009-11-10
|
[
[
"Ma",
"Yong-Liang",
""
],
[
"Wang",
"Qing",
""
],
[
"Wu",
"Yue-Liang",
""
]
] |
In this paper, we present the full Lagrangian of mesons (pseudoscalars, vectors and axial-vectors) to $O(p^4)$ by using the explicit global chiral symmetry and hidden local symmetry in the chiral limit. In this approach, we see that there are many other terms besides the usual eleven terms given in the literature from hidden local symmetry approach. Of particular, there are some terms in our full results which are important for understanding the vector meson dominance and $\pi-\pi$ scattering and providing consistent predictions on the decay rates of $a_1\to\gamma\pi$ and $a_1\to\rho\pi$ as well as for constructing a consistent effective chiral Lagrangian with chiral perturbation theory. It is likely that the structures of the effective chiral Lagrangian for $O(p^4)$ given in the literature by using hidden local symmetry are incomplete and consequently the resulting couplings are not reliable. It is examined that the more general effective chiral Lagrangian given in present paper can provide more consistent predictions for the low energy phenomenology of $\rho-a_1$ system and result in more consistent descriptions on the low energy behavior of light flavor mesons.
|
2205.14166
|
Dietrich Bodeker
|
Dietrich Bodeker and Jan Nienaber
|
Scalar field damping at high temperatures
|
18 pages, explanations and some details added, references added,
(non-)role of scale-invariance violation clarified, results unchanged.
Closely resembles published version
|
Phys.Rev.D 106 (2022) 5, 056016
|
10.1103/PhysRevD.106.056016
| null |
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The motion of a scalar field that interacts with a hot plasma, like the
inflaton during reheating, is damped, which is a dissipative process. At high
temperatures the damping can be described by a local term in the effective
equation of motion. The damping coefficient is sensitive to multiple
scattering. In the loop expansion its computation would require an all-order
resummation. Instead we solve an effective Boltzmann equation, similarly to the
computation of transport coefficients. For an interaction with another scalar
field we obtain a simple relation between the damping coefficient and the bulk
viscosity, so that one can make use of known results for the latter. The
numerical prefactor of the damping coefficient turns out to be rather large, of
order $ 10 ^ 4 $.
|
[
{
"created": "Fri, 27 May 2022 18:00:02 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Sep 2022 18:46:04 GMT",
"version": "v2"
}
] |
2022-10-05
|
[
[
"Bodeker",
"Dietrich",
""
],
[
"Nienaber",
"Jan",
""
]
] |
The motion of a scalar field that interacts with a hot plasma, like the inflaton during reheating, is damped, which is a dissipative process. At high temperatures the damping can be described by a local term in the effective equation of motion. The damping coefficient is sensitive to multiple scattering. In the loop expansion its computation would require an all-order resummation. Instead we solve an effective Boltzmann equation, similarly to the computation of transport coefficients. For an interaction with another scalar field we obtain a simple relation between the damping coefficient and the bulk viscosity, so that one can make use of known results for the latter. The numerical prefactor of the damping coefficient turns out to be rather large, of order $ 10 ^ 4 $.
|
0907.2346
|
Alexander Laschka
|
Wolfram Weise
|
Selected challenges in low-energy QCD and hadron physics
|
8 pages, 10 figures, 4th Winter School on Fundamental Challenges of
QCD, Schladming 2009
|
Nucl.Phys.Proc.Suppl.195:267-274,2009
|
10.1016/j.nuclphysbps.2009.10.019
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This presentation briefly addresses three basic issues of low-energy QCD:
first, whether the Nambu-Goldstone scenario of spontaneous chiral symmetry
breaking is well established; secondly, whether there is a dynamical
entanglement of the chiral and deconfinement crossover transitions in QCD; and
thirdly, what is the status of knowledge about the phase diagram of QCD at low
temperature and non-zero baryon density. These three topics were injected as
key words into a panel discussion at the Schladming school on Challenges in
QCD. The following exposition reflects the style and character of the
discussions, with no claim of completeness.
|
[
{
"created": "Tue, 14 Jul 2009 16:04:43 GMT",
"version": "v1"
}
] |
2009-12-04
|
[
[
"Weise",
"Wolfram",
""
]
] |
This presentation briefly addresses three basic issues of low-energy QCD: first, whether the Nambu-Goldstone scenario of spontaneous chiral symmetry breaking is well established; secondly, whether there is a dynamical entanglement of the chiral and deconfinement crossover transitions in QCD; and thirdly, what is the status of knowledge about the phase diagram of QCD at low temperature and non-zero baryon density. These three topics were injected as key words into a panel discussion at the Schladming school on Challenges in QCD. The following exposition reflects the style and character of the discussions, with no claim of completeness.
|
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