id stringlengths 9 14 | submitter stringlengths 1 56 ⌀ | authors stringlengths 5 7.68k | title stringlengths 3 299 | comments stringlengths 1 1.15k ⌀ | journal-ref stringlengths 9 298 ⌀ | doi stringlengths 12 97 ⌀ | report-no stringlengths 3 341 ⌀ | categories stringclasses 869 values | license stringclasses 9 values | orig_abstract stringlengths 16 2.44k | versions listlengths 1 39 | update_date stringlengths 10 10 | authors_parsed listlengths 1 565 | abstract stringlengths 13 2.44k |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
hep-ph/0401086 | Alexandre Gavrilik | A.M. Gavrilik | Quantum groups and Cabibbo mixing | 8 pages, 1 figure, LaTeX; talk given at the 5th International
Conference "Symmetry in Nonlinear Mathematical Physics", Kyiv (Kiev),
Ukraine, June 23-29, 2003 | EconfC0306234:759-766,2003 | null | null | hep-ph hep-th nucl-th | null | Treating the issue of hadron masses and mass relations by the use of quantum
groups U_q(su_n) taken as hadron flavor symmetries suggests, at least in the
case of baryons, a direct connection of the deformation parameter q with the
Cabibbo angle. We discuss possible manifestations of the Cabibbo mixing implied
by such connection, including unusual ones.
| [
{
"created": "Mon, 12 Jan 2004 18:17:06 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Gavrilik",
"A. M.",
""
]
] | Treating the issue of hadron masses and mass relations by the use of quantum groups U_q(su_n) taken as hadron flavor symmetries suggests, at least in the case of baryons, a direct connection of the deformation parameter q with the Cabibbo angle. We discuss possible manifestations of the Cabibbo mixing implied by such connection, including unusual ones. |
1903.08148 | Hai-Yang Cheng | Hai-Yang Cheng, Fanrong Xu | Lifetimes of Doubly Heavy Baryons ${\cal B}_{bb}$ and ${\cal B}_{bc}$ | 22 pages, 2 figures. arXiv admin note: substantial text overlap with
arXiv:1809.08102 | Phys. Rev. D 99, 073006 (2019) | 10.1103/PhysRevD.99.073006 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Lifetimes of the doubly heavy baryons ${\cal B}_{bb}$ and ${\cal B}_{bc}$ are
analyzed within the framework of the heavy quark expansion (HQE). Lifetime
differences arise from the spectator effects such as $W$-exchange and Pauli
interference. For doubly bottom baryons, the lifetime pattern is
$\tau(\Omega_{bb}^-)\sim \tau(\Xi_{bb}^{-})>\tau(\Xi_{bb}^0)$. The
$\Xi_{bb}^{0}$ baryon is shortest-lived owing to the $W$-exchange contribution,
while $\Xi_{bb}^{-}$ and $\Omega_{bb}^{-}$ have similar lifetimes as they both
receive contributions from destructive Pauli interference. We find the lifetime
ratio $\tau(\Xi_{bb}^{-})/\tau(\Xi_{bb}^0)=1.26$\,. The large $W$-exchange
contribution to $\Xi_{bc}^0$ through the subprocess $cd\to us\to cd$ and the
sizable destructive Pauli interference contribution to $\Xi_{bc}^+$ imply a
substantial lifetime difference between $\Xi_{bc}^+$ and $\Xi_{bc}^0$. In the
presence of subleading $1/m_c$ and $1/m_b$ corrections to the spectator
effects, we find that $\tau(\Omega_{bc}^0)$ becomes longest-lived. This is
because $\Gamma^{\rm int}_+$ and $\Gamma^{\rm semi}$ for $\Omega_{bc}^0$ are
subject to large cancellation between dimension-6 and -7 operators. This
implies that the subleading corrections are too large to justify the validity
of the HQE. Demanding that $\Gamma^{cs}_{{\rm int+}}(\Omega_{bc}^0)$,
$\Gamma^{{\rm SL},cs}_{\rm int}(\Omega_{bc}^0)$ be positive and
$\Gamma^{cu}_{{\rm int-}}(\Xi^+_{bc})$ be negative, we conjecture that
$1.68\times 10^{-13}s<\tau(\Omega_{bc}^0)< 3.70\times 10^{-13}s$ , $4.09\times
10^{-13}s<\tau(\Xi_{bc}^+)< 6.07\times 10^{-13}s$ and $0.93\times
10^{-13}s<\tau(\Xi_{bc}^0)< 1.18\times 10^{-13}s$. Hence, the lifetime
hierarchy of ${\cal B}_{bc}$ baryons is expected to be the pattern
$\tau(\Xi_{bc}^{+})>\tau(\Omega_{bc}^0)>\tau(\Xi_{bc}^0)$.
| [
{
"created": "Mon, 18 Mar 2019 22:36:09 GMT",
"version": "v1"
}
] | 2019-04-24 | [
[
"Cheng",
"Hai-Yang",
""
],
[
"Xu",
"Fanrong",
""
]
] | Lifetimes of the doubly heavy baryons ${\cal B}_{bb}$ and ${\cal B}_{bc}$ are analyzed within the framework of the heavy quark expansion (HQE). Lifetime differences arise from the spectator effects such as $W$-exchange and Pauli interference. For doubly bottom baryons, the lifetime pattern is $\tau(\Omega_{bb}^-)\sim \tau(\Xi_{bb}^{-})>\tau(\Xi_{bb}^0)$. The $\Xi_{bb}^{0}$ baryon is shortest-lived owing to the $W$-exchange contribution, while $\Xi_{bb}^{-}$ and $\Omega_{bb}^{-}$ have similar lifetimes as they both receive contributions from destructive Pauli interference. We find the lifetime ratio $\tau(\Xi_{bb}^{-})/\tau(\Xi_{bb}^0)=1.26$\,. The large $W$-exchange contribution to $\Xi_{bc}^0$ through the subprocess $cd\to us\to cd$ and the sizable destructive Pauli interference contribution to $\Xi_{bc}^+$ imply a substantial lifetime difference between $\Xi_{bc}^+$ and $\Xi_{bc}^0$. In the presence of subleading $1/m_c$ and $1/m_b$ corrections to the spectator effects, we find that $\tau(\Omega_{bc}^0)$ becomes longest-lived. This is because $\Gamma^{\rm int}_+$ and $\Gamma^{\rm semi}$ for $\Omega_{bc}^0$ are subject to large cancellation between dimension-6 and -7 operators. This implies that the subleading corrections are too large to justify the validity of the HQE. Demanding that $\Gamma^{cs}_{{\rm int+}}(\Omega_{bc}^0)$, $\Gamma^{{\rm SL},cs}_{\rm int}(\Omega_{bc}^0)$ be positive and $\Gamma^{cu}_{{\rm int-}}(\Xi^+_{bc})$ be negative, we conjecture that $1.68\times 10^{-13}s<\tau(\Omega_{bc}^0)< 3.70\times 10^{-13}s$ , $4.09\times 10^{-13}s<\tau(\Xi_{bc}^+)< 6.07\times 10^{-13}s$ and $0.93\times 10^{-13}s<\tau(\Xi_{bc}^0)< 1.18\times 10^{-13}s$. Hence, the lifetime hierarchy of ${\cal B}_{bc}$ baryons is expected to be the pattern $\tau(\Xi_{bc}^{+})>\tau(\Omega_{bc}^0)>\tau(\Xi_{bc}^0)$. |
hep-ph/9909228 | Nicolao Fornengo | A. Bottino (a), F. Donato (b), N. Fornengo (c), S. Scopel (d) ((a)
Torino University, (b) LAPP-Annecy, (c) Universitat de Valencia, (d)
Universidad de Zaragoza) | Implications for relic neutralinos of the theoretical uncertainties in
the neutralino-nucleon cross-section | 23 pages, 7 figures, 1 table, typeset with ReVTeX. Due to size
limitations, the version on the archive has low resolution figures. A full
version of the paper can be found at
http://www.to.infn.it/~fornengo/papers/dama_sets.ps.gz | Astropart.Phys.13:215-225,2000 | 10.1016/S0927-6505(99)00122-X | DFTT 42/99, FTUV/99-60, IFIC/99-63 | hep-ph astro-ph | null | We discuss the effect induced on the neutralino-nucleon cross-section by the
present uncertainties in the values of the quark masses and of the quark scalar
densities in the nucleon. We examine the implications of this aspect on the
determination of the neutralino cosmological properties, as derived from
measurements of WIMP direct detection. We show that, within current theoretical
uncertainties, the DAMA annual modulation data are compatible with a neutralino
as a major dark matter component, to an extent which is even larger than the
one previously derived. We also comment on implications of the mentioned
uncertainties for experiments of indirect dark matter detection.
| [
{
"created": "Thu, 2 Sep 1999 15:20:55 GMT",
"version": "v1"
}
] | 2011-05-23 | [
[
"Bottino",
"A.",
"",
"a"
],
[
"Donato",
"F.",
"",
"b"
],
[
"Fornengo",
"N.",
"",
"c"
],
[
"Scopel",
"S.",
"",
"d"
]
] | We discuss the effect induced on the neutralino-nucleon cross-section by the present uncertainties in the values of the quark masses and of the quark scalar densities in the nucleon. We examine the implications of this aspect on the determination of the neutralino cosmological properties, as derived from measurements of WIMP direct detection. We show that, within current theoretical uncertainties, the DAMA annual modulation data are compatible with a neutralino as a major dark matter component, to an extent which is even larger than the one previously derived. We also comment on implications of the mentioned uncertainties for experiments of indirect dark matter detection. |
1008.0098 | Einan Gardi | Einan Gardi, Eric Laenen, Gerben Stavenga, Chris D. White | Webs in multiparton scattering using the replica trick | Revised version, accepted for publication in JHEP. Section 6 revised.
85 pages, 28 figures | JHEP 1011:155,2010 | 10.1007/JHEP11(2010)155 | Edinburgh 2010/20, ITFA-10-18, ITP-UU-10/22, IPPP/10/54,
FERMILAB-PUB-10-234-T, NIKHEF/2010-018 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Soft gluon exponentiation in non-abelian gauge theories can be described in
terms of webs. So far this description has been restricted to amplitudes with
two hard partons, where webs were defined as the colour-connected subset of
diagrams. Here we generalise the concept of webs to the multi-leg case, where
the hard interaction involves non-trivial colour flow. Using the replica trick
from statistical physics we solve the combinatorial problem of non-abelian
exponentiation to all orders. In particular, we derive an algorithm for
computing the colour factor associated with any given diagram in the exponent.
The emerging result is exponentiation of a sum of webs, where each web is a
linear combination of a subset of diagrams that are mutually related by
permuting the eikonal gluon attachments to each hard parton. These linear
combinations are responsible for partial cancellation of subdivergences,
conforming with the renormalization of a multi-leg eikonal vertex. We also
discuss the generalisation of exponentiation properties to beyond the eikonal
approximation.
| [
{
"created": "Sat, 31 Jul 2010 14:59:57 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Nov 2010 12:26:25 GMT",
"version": "v2"
}
] | 2010-12-06 | [
[
"Gardi",
"Einan",
""
],
[
"Laenen",
"Eric",
""
],
[
"Stavenga",
"Gerben",
""
],
[
"White",
"Chris D.",
""
]
] | Soft gluon exponentiation in non-abelian gauge theories can be described in terms of webs. So far this description has been restricted to amplitudes with two hard partons, where webs were defined as the colour-connected subset of diagrams. Here we generalise the concept of webs to the multi-leg case, where the hard interaction involves non-trivial colour flow. Using the replica trick from statistical physics we solve the combinatorial problem of non-abelian exponentiation to all orders. In particular, we derive an algorithm for computing the colour factor associated with any given diagram in the exponent. The emerging result is exponentiation of a sum of webs, where each web is a linear combination of a subset of diagrams that are mutually related by permuting the eikonal gluon attachments to each hard parton. These linear combinations are responsible for partial cancellation of subdivergences, conforming with the renormalization of a multi-leg eikonal vertex. We also discuss the generalisation of exponentiation properties to beyond the eikonal approximation. |
hep-ph/9902281 | Carl E. Carlson | C. E. Carlson, J. Hanlon, and K. E. Lassila | Experimental and Theoretical Results for Weak Charge Current Backward
Proton Production | 8 pages, 5 figures | Phys.Rev. D63 (2001) 117301 | 10.1103/PhysRevD.63.117301 | WM-99-102; FERMILAB-Pub-96/054-E | hep-ph | null | In this paper, we do three things in the study of deuteron break-up by high
energy neutrino beams. (1) We present previously unpublished data on neutrino
induced backward protons from deuteron targets; (2) we calculate the
contributions from both the two-nucleon (2N) and six-quark (6q) deuteron
components, which depend upon the overall normalization of the part that is 6q;
and (3) we suggest other signatures for distinguishing the 2N and 6q clusters.
We conclude that the 6q cluster easily explains the shape of the high momentum
backward proton spectrum, and its size is nicely explained if the amount of 6q
is one or a few percent by normalization of the deuteron. There is a crossover,
above which the 6q contribution is important or dominant, at 300--400 MeV/c
backward proton momentum.
| [
{
"created": "Tue, 9 Feb 1999 18:12:10 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Carlson",
"C. E.",
""
],
[
"Hanlon",
"J.",
""
],
[
"Lassila",
"K. E.",
""
]
] | In this paper, we do three things in the study of deuteron break-up by high energy neutrino beams. (1) We present previously unpublished data on neutrino induced backward protons from deuteron targets; (2) we calculate the contributions from both the two-nucleon (2N) and six-quark (6q) deuteron components, which depend upon the overall normalization of the part that is 6q; and (3) we suggest other signatures for distinguishing the 2N and 6q clusters. We conclude that the 6q cluster easily explains the shape of the high momentum backward proton spectrum, and its size is nicely explained if the amount of 6q is one or a few percent by normalization of the deuteron. There is a crossover, above which the 6q contribution is important or dominant, at 300--400 MeV/c backward proton momentum. |
hep-ph/9612363 | Georg Weiglein | A. Djouadi, P. Gambino, S. Heinemeyer, W. Hollik, C. J\"unger, G.
Weiglein | Supersymmetric contributions to electroweak precision observables: QCD
corrections | 10 pages, LaTeX, 5 ps-figures. The paper is also available via www at
http://www-itp.physik.uni-karlsruhe.de/prep/prep96/preplist96.html | Phys.Rev.Lett.78:3626-3629,1997 | 10.1103/PhysRevLett.78.3626 | KA-TP-29-1996, MPI-PhT/96-129, PM/96-36 | hep-ph | null | We calculate the two-loop QCD correction to the scalar quark contributions to
the electroweak gauge-boson self-energies at zero momentum-transfer in the
supersymmetric extension of the Standard Model. We then derive the
$O(\alpha_s)$ correction to the contribution of the scalar top and bottom quark
loops to the rho parameter, which is the most sizable supersymmetric
contribution to the electroweak mixing angle and the W-boson mass. The two-loop
corrections modify the one-loop contribution by up to 30%; the gluino decouples
for large masses. Contrary to the SM case where the QCD corrections are
negative and screen the one-loop value, the corresponding corrections in the
supersymmetric case are in general positive, increasing the sensitivity in the
search for scalar quarks through their virtual effects in high-precision
electroweak observables.
| [
{
"created": "Sat, 14 Dec 1996 20:58:47 GMT",
"version": "v1"
}
] | 2009-07-09 | [
[
"Djouadi",
"A.",
""
],
[
"Gambino",
"P.",
""
],
[
"Heinemeyer",
"S.",
""
],
[
"Hollik",
"W.",
""
],
[
"Jünger",
"C.",
""
],
[
"Weiglein",
"G.",
""
]
] | We calculate the two-loop QCD correction to the scalar quark contributions to the electroweak gauge-boson self-energies at zero momentum-transfer in the supersymmetric extension of the Standard Model. We then derive the $O(\alpha_s)$ correction to the contribution of the scalar top and bottom quark loops to the rho parameter, which is the most sizable supersymmetric contribution to the electroweak mixing angle and the W-boson mass. The two-loop corrections modify the one-loop contribution by up to 30%; the gluino decouples for large masses. Contrary to the SM case where the QCD corrections are negative and screen the one-loop value, the corresponding corrections in the supersymmetric case are in general positive, increasing the sensitivity in the search for scalar quarks through their virtual effects in high-precision electroweak observables. |
1609.06834 | Motoo Suzuki | Masahiro Ibe, Motoo Suzuki, Tsutomu T. Yanagida | Revisiting gravitino dark matter in thermal leptogenesis | 26 pages, 5 figures | null | 10.1007/JHEP02(2017)063 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we revisit the gravitino dark matter scenario in the presence
of the bilinear $R$-parity violating interaction. In particular, we discuss a
consistency with the thermal leptogenesis. For a high reheating temperature
required for the thermal leptogenesis, the gravitino dark matter tends to be
overproduced, which puts a severe upper limit on the gluino mass. As we will
show, a large portion of parameter space of the gravitino dark matter scenario
has been excluded by combining the constraints from the gravitino abundance and
the null results of the searches for the superparticles at the LHC experiments.
In particular, the models with the stau (and other charged slepton) NLSP has
been almost excluded by the searches for the long-lived charged particles at
the LHC unless the required reheating temperature is somewhat lowered by
assuming, for example, a degenerated right-handed neutrino mass spectrum.
| [
{
"created": "Thu, 22 Sep 2016 06:36:38 GMT",
"version": "v1"
},
{
"created": "Wed, 31 May 2017 04:41:58 GMT",
"version": "v2"
}
] | 2017-06-01 | [
[
"Ibe",
"Masahiro",
""
],
[
"Suzuki",
"Motoo",
""
],
[
"Yanagida",
"Tsutomu T.",
""
]
] | In this paper, we revisit the gravitino dark matter scenario in the presence of the bilinear $R$-parity violating interaction. In particular, we discuss a consistency with the thermal leptogenesis. For a high reheating temperature required for the thermal leptogenesis, the gravitino dark matter tends to be overproduced, which puts a severe upper limit on the gluino mass. As we will show, a large portion of parameter space of the gravitino dark matter scenario has been excluded by combining the constraints from the gravitino abundance and the null results of the searches for the superparticles at the LHC experiments. In particular, the models with the stau (and other charged slepton) NLSP has been almost excluded by the searches for the long-lived charged particles at the LHC unless the required reheating temperature is somewhat lowered by assuming, for example, a degenerated right-handed neutrino mass spectrum. |
hep-ph/9806298 | Davison E. Soper | F. Hautmann, Z. Kunszt and D.E. Soper | Diffractive deeply inelastic scattering of hadronic states with small
transverse size | 8 pages including 3 figures, REVTEX | Phys.Rev.Lett. 81 (1998) 3333-3336 | 10.1103/PhysRevLett.81.3333 | CERN-TH/98-168, ETH-TH/98-14, OITS 648 | hep-ph | null | Diffractive deeply inelastic scattering from a hadron is described in terms
of diffractive quark and gluon distributions. If the transverse size of the
hadronic state is sufficiently small, these distributions are calculable using
perturbation theory. We present such a calculation and discuss the underlying
dynamics. We comment on the relation between this dynamics and the pattern of
scaling violation observed in the hard diffraction of large-size states at
HERA.
| [
{
"created": "Sun, 7 Jun 1998 01:25:51 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Hautmann",
"F.",
""
],
[
"Kunszt",
"Z.",
""
],
[
"Soper",
"D. E.",
""
]
] | Diffractive deeply inelastic scattering from a hadron is described in terms of diffractive quark and gluon distributions. If the transverse size of the hadronic state is sufficiently small, these distributions are calculable using perturbation theory. We present such a calculation and discuss the underlying dynamics. We comment on the relation between this dynamics and the pattern of scaling violation observed in the hard diffraction of large-size states at HERA. |
0808.2921 | Firooz Arash | Firooz Arash and Fatemeh Taghavi-Shahri | Valence Quark Polarization In the Nucleon And the Deuteron Data | 12 pages, 5 figures To appear in Phys. Lett. B | Phys.Lett.B668:193-196,2008 | 10.1016/j.physletb.2008.08.043 | null | hep-ph hep-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Within the framework of the so-called "valon" model, we argue that a
substantial part of the nucleon spin, about 40%, is carried by the polarized
valence quarks. The remaining is the result of cancellations between gluon
polarization and the orbital angular momentum, where the gluon polarization is
the dominant one. It is shown that the sea quark contribution to the spin of
any hadron is simply marginal and consistent with zero. Our findings point to a
substantially smaller value for a_8 thaninferred from hyperon- $\beta$ decay,
suggesting that fullSU(3) symmetric assumption needs to be reconsidered. New
and emerging experimental data tend to support this finding. Finally, we show
that within the model described here the experimental data on the polarized
structure functions $g_{1}^{p,n,d}$ are reproduced.
| [
{
"created": "Thu, 21 Aug 2008 13:01:42 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Arash",
"Firooz",
""
],
[
"Taghavi-Shahri",
"Fatemeh",
""
]
] | Within the framework of the so-called "valon" model, we argue that a substantial part of the nucleon spin, about 40%, is carried by the polarized valence quarks. The remaining is the result of cancellations between gluon polarization and the orbital angular momentum, where the gluon polarization is the dominant one. It is shown that the sea quark contribution to the spin of any hadron is simply marginal and consistent with zero. Our findings point to a substantially smaller value for a_8 thaninferred from hyperon- $\beta$ decay, suggesting that fullSU(3) symmetric assumption needs to be reconsidered. New and emerging experimental data tend to support this finding. Finally, we show that within the model described here the experimental data on the polarized structure functions $g_{1}^{p,n,d}$ are reproduced. |
2305.07219 | Somnath Kar | Joyati Mondal, Hirak Koley, Somnath Kar, Premomoy Ghosh, Argha Deb,
and Mitali Mondal | Forward-backward multiplicity and momentum correlations in pp and pPb
collisions at the LHC energies | 10 Pages, 13 Figures, Accepted in Physical Review D | null | 10.1103/PhysRevD.107.114016 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Correlations and fluctuations between produced particles in an
ultra-relativistic nuclear collision remain one of the successor to understand
the basics of the particle production mechanism. More differential tools like
Forward-Backward (FB) correlations between particles from two different
phase-space further strengthened our cognizance. We have studied the strength
of FB correlations in terms of charged particle multiplicity and summed
transverse momentum for proton-proton ($pp$) and proton-lead ($pPb$) collisions
at the centre-of-mass energies $\sqrt{s}$ = 13 TeV and $\sqrt{s_{\rm NN}}$ =
5.02 TeV respectively for the EPOS3 simulated events with hydrodynamical
evolution of produced particles. Furthermore, the correlation strengths are
separately obtained for the particles coming from the core and the corona. FB
correlation strengths are examined as a function of psedorapidity gap
($\eta_{gap}$), psedorapidity window-width ($\delta\eta$), centre-of-mass
energy ($\sqrt{s}$), minimum transverse momentum ($p_{Tmin}$) and different
multiplicity classes following standard kinematical cuts used by the ALICE and
the ATLAS experiments at the LHC for all three EPOS3 event samples. EPOS3 model
shows a similar trend of FB multiplicity and momentum correlation strengths for
both $pp$ \& $pPb$ systems, though the correlation strengths are found to be
larger for $pPb$ system than $pp$ system. Moreover, $\delta\eta$-weighted
average of FB correlation strengths as a function of different center-of-mass
energies for $pp$ collisions delineates a tendency of saturation at very high
energies.
| [
{
"created": "Fri, 12 May 2023 03:20:17 GMT",
"version": "v1"
}
] | 2023-06-28 | [
[
"Mondal",
"Joyati",
""
],
[
"Koley",
"Hirak",
""
],
[
"Kar",
"Somnath",
""
],
[
"Ghosh",
"Premomoy",
""
],
[
"Deb",
"Argha",
""
],
[
"Mondal",
"Mitali",
""
]
] | Correlations and fluctuations between produced particles in an ultra-relativistic nuclear collision remain one of the successor to understand the basics of the particle production mechanism. More differential tools like Forward-Backward (FB) correlations between particles from two different phase-space further strengthened our cognizance. We have studied the strength of FB correlations in terms of charged particle multiplicity and summed transverse momentum for proton-proton ($pp$) and proton-lead ($pPb$) collisions at the centre-of-mass energies $\sqrt{s}$ = 13 TeV and $\sqrt{s_{\rm NN}}$ = 5.02 TeV respectively for the EPOS3 simulated events with hydrodynamical evolution of produced particles. Furthermore, the correlation strengths are separately obtained for the particles coming from the core and the corona. FB correlation strengths are examined as a function of psedorapidity gap ($\eta_{gap}$), psedorapidity window-width ($\delta\eta$), centre-of-mass energy ($\sqrt{s}$), minimum transverse momentum ($p_{Tmin}$) and different multiplicity classes following standard kinematical cuts used by the ALICE and the ATLAS experiments at the LHC for all three EPOS3 event samples. EPOS3 model shows a similar trend of FB multiplicity and momentum correlation strengths for both $pp$ \& $pPb$ systems, though the correlation strengths are found to be larger for $pPb$ system than $pp$ system. Moreover, $\delta\eta$-weighted average of FB correlation strengths as a function of different center-of-mass energies for $pp$ collisions delineates a tendency of saturation at very high energies. |
0808.1094 | Michihisa Takeuchi | Mihoko M. Nojiri, Kazuki Sakurai, Yasuhiro Shimizu and Michihisa
Takeuchi | Handling jets + missing E_T channel using inclusive mT2 | Some typos are fixed and references are updated | JHEP0810:100,2008 | 10.1088/1126-6708/2008/10/100 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The ATLAS and CMS experiments at the Large Hadron Collider (LHC) may discover
the squarks (\tilde{q}) and gluino (\tilde{g}) of the minimal supersymmetric
standard model (MSSM) in the early stage of the experiments if their masses are
lighter than 1.5 TeV. In this paper we propose the sub-system m_{T2} variable,
which is sensitive to the gluino mass when m_{\tilde{q}}>m_{\tilde{g}}. Using
it with the inclusive m_{T2} distribution proposed earlier, \tilde{q} and
\tilde{g} masses can be determined simultaneously in the early stage of the
experiments. Results of Monte Carlo simulations at sample MSSM model points are
presented both for signal and background.
| [
{
"created": "Thu, 7 Aug 2008 19:47:51 GMT",
"version": "v1"
},
{
"created": "Fri, 8 Aug 2008 15:37:44 GMT",
"version": "v2"
},
{
"created": "Mon, 6 Oct 2008 08:09:04 GMT",
"version": "v3"
}
] | 2009-09-29 | [
[
"Nojiri",
"Mihoko M.",
""
],
[
"Sakurai",
"Kazuki",
""
],
[
"Shimizu",
"Yasuhiro",
""
],
[
"Takeuchi",
"Michihisa",
""
]
] | The ATLAS and CMS experiments at the Large Hadron Collider (LHC) may discover the squarks (\tilde{q}) and gluino (\tilde{g}) of the minimal supersymmetric standard model (MSSM) in the early stage of the experiments if their masses are lighter than 1.5 TeV. In this paper we propose the sub-system m_{T2} variable, which is sensitive to the gluino mass when m_{\tilde{q}}>m_{\tilde{g}}. Using it with the inclusive m_{T2} distribution proposed earlier, \tilde{q} and \tilde{g} masses can be determined simultaneously in the early stage of the experiments. Results of Monte Carlo simulations at sample MSSM model points are presented both for signal and background. |
hep-ph/0605055 | Xiangdong Ji | Xiangdong Ji and D. Toublan | Heavy-quark contribution to the proton's magnetic moment | 4 pages, 2 figures | Phys.Lett.B647:361-365,2007 | 10.1016/j.physletb.2007.02.047 | null | hep-ph | null | We study the contribution to the proton's magnetic moment from a heavy quark
sea in quantum chromodynamics. The heavy quark is integrated out perturbatively
to obtain an effective dimension-6 magnetic moment operator composed of three
gluon fields. The leading contribution to the matrix element in the proton
comes from a quadratically divergent term associated with a light-quark tensor
operator. With an approximate knowledge of the proton's tensor charge, we
conclude that a heavy sea-quark contribution to the proton's magnetic moment is
positive in the asymptotic limit. We comment on the implication of this result
for the physical strange quark.
| [
{
"created": "Fri, 5 May 2006 00:31:13 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Ji",
"Xiangdong",
""
],
[
"Toublan",
"D.",
""
]
] | We study the contribution to the proton's magnetic moment from a heavy quark sea in quantum chromodynamics. The heavy quark is integrated out perturbatively to obtain an effective dimension-6 magnetic moment operator composed of three gluon fields. The leading contribution to the matrix element in the proton comes from a quadratically divergent term associated with a light-quark tensor operator. With an approximate knowledge of the proton's tensor charge, we conclude that a heavy sea-quark contribution to the proton's magnetic moment is positive in the asymptotic limit. We comment on the implication of this result for the physical strange quark. |
hep-ph/9503219 | Hai-Yang Cheng | Hai-Yang Cheng | Hadronic Weak Decays of Heavy Mesons and Nonfactorization | Latex, 16 pages | Z.Phys. C69 (1996) 647-654 | null | IP-ASTP-04-95 | hep-ph | null | The parameters $\chi_{1,2}$, which measure nonfactorizable soft gluon
contributions to hadronic weak decays of mesons, are updated by extracting them
from the data of $D,\,B\to PP,~VP$ decays ($P$: pseudoscalar meson, $V$: vector
meson). It is found that $\chi_2$ ranges from $-0.36$ to $-0.60$ in the decays
from $D\to\bar{K}\pi$ to $D^+\to\phi\pi^+,~D\to\bar{K}^*\pi$, while it is of
order 10\% with a positive sign in $B\to\psi K,~D\pi,~D^*\pi,~D\rho$ decays.
Therefore, the effective parameter $a_2$ is process dependent in charm decay,
whereas it stays fairly stable in $B$ decay. This implies the picture that
nonfactorizable effects become stronger when the decay particles become less
energetic after hadronization. As for $D,\,B\to VV$ decays, the presence of
nonfactorizable terms in general prevents a possible definition of effective
$a_1$ and $a_2$. This is reenforced by the observation of a large longitudinal
polarization fraction in $B\to\psi K^*$ decay, implying $S$-wave dominated
nonfactorizable effects. The nonfactorizable term dominated by the $S$-wave is
also essential for understanding the decay rate of $B^-\to D^{*0} \rho^-$. It
is found that all nonfactorizable effects $A_1^{nf}/A_1^{BK^*},~A
_1^{nf}/A_1^{B\rho},~A_1^{nf}/A_1^{BD^*}$ ($nf$ standing for nonfactorization)
are positive and of order 10\%, in accordance with $\chi_2(B\to D(D^*)\pi(
\rho))$ and $\chi_2(B\to\psi K)$. However, we show that in $D\to\bar{K}^*\rho$
decay nonfactorizable effects cannot be dominated by the $S$-wave. A
polarization measurement in the color- and Cabibbo-suppressed decay mode
$D^+\to\phi\rho^+$ is strongly urged in order to test if $A_2^{nf}/A_2$ plays a
more pivotal role than $A_1^{nf}/A_1$ in charm decay.
| [
{
"created": "Fri, 3 Mar 1995 08:11:41 GMT",
"version": "v1"
}
] | 2016-09-01 | [
[
"Cheng",
"Hai-Yang",
""
]
] | The parameters $\chi_{1,2}$, which measure nonfactorizable soft gluon contributions to hadronic weak decays of mesons, are updated by extracting them from the data of $D,\,B\to PP,~VP$ decays ($P$: pseudoscalar meson, $V$: vector meson). It is found that $\chi_2$ ranges from $-0.36$ to $-0.60$ in the decays from $D\to\bar{K}\pi$ to $D^+\to\phi\pi^+,~D\to\bar{K}^*\pi$, while it is of order 10\% with a positive sign in $B\to\psi K,~D\pi,~D^*\pi,~D\rho$ decays. Therefore, the effective parameter $a_2$ is process dependent in charm decay, whereas it stays fairly stable in $B$ decay. This implies the picture that nonfactorizable effects become stronger when the decay particles become less energetic after hadronization. As for $D,\,B\to VV$ decays, the presence of nonfactorizable terms in general prevents a possible definition of effective $a_1$ and $a_2$. This is reenforced by the observation of a large longitudinal polarization fraction in $B\to\psi K^*$ decay, implying $S$-wave dominated nonfactorizable effects. The nonfactorizable term dominated by the $S$-wave is also essential for understanding the decay rate of $B^-\to D^{*0} \rho^-$. It is found that all nonfactorizable effects $A_1^{nf}/A_1^{BK^*},~A _1^{nf}/A_1^{B\rho},~A_1^{nf}/A_1^{BD^*}$ ($nf$ standing for nonfactorization) are positive and of order 10\%, in accordance with $\chi_2(B\to D(D^*)\pi( \rho))$ and $\chi_2(B\to\psi K)$. However, we show that in $D\to\bar{K}^*\rho$ decay nonfactorizable effects cannot be dominated by the $S$-wave. A polarization measurement in the color- and Cabibbo-suppressed decay mode $D^+\to\phi\rho^+$ is strongly urged in order to test if $A_2^{nf}/A_2$ plays a more pivotal role than $A_1^{nf}/A_1$ in charm decay. |
hep-ph/0211459 | N. G. Marchuk | N.G. Marchuk | A model of composite structure of quarks and leptons | 7 pages | null | null | null | hep-ph | null | In the model every quark or lepton is identified with a quartet of four "more
elementary" particles. One particle in a quartet is a massive spin-0 boson and
other three particles are massless spin-1/2 fermions.
| [
{
"created": "Fri, 29 Nov 2002 13:49:01 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Jan 2003 11:19:03 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Marchuk",
"N. G.",
""
]
] | In the model every quark or lepton is identified with a quartet of four "more elementary" particles. One particle in a quartet is a massive spin-0 boson and other three particles are massless spin-1/2 fermions. |
1505.03798 | Gui-Jun Ding | Chang-Yuan Yao, Gui-Jun Ding | Lepton and Quark Mixing Patterns from Finite Flavor Symmetries | 52 pages, 9 figures | Phys. Rev. D 92, 096010 (2015) | 10.1103/PhysRevD.92.096010 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We perform a systematical and analytical study of lepton mixing which can be
derived from the subgroups of $SU(3)$ under the assumption that neutrinos are
Dirac particles. We find that type D groups can predict lepton mixing patterns
compatible with the experimental data at $3\sigma$ level. The lepton mixing
matrix turns out to be of the trimaximal form, and the Dirac CP violating phase
is trivial. Moreover, we extend the flavor symmetry to the quark sector. The
Cabibbo mixing between the first two generations of quarks can be generated by
type D groups. Since all the finite subgroups of $U(3)$ which are not the
subgroups of $SU(3)$ have not been classified, an exhaustive scan over all
finite discrete groups up to order 2000 is performed with the help of the
computer algebra system \texttt{GAP}. We find that only 90 (10) groups for
Dirac (Majorana) neutrinos can generate the lepton mixing angles in the
experimentally preferred ranges. The lepton mixing matrix is still the
trimaximal pattern and the Dirac CP phase remains trivial. The smallest groups
which lead to viable mixing angles are $[162, 10]$, $[162, 12]$ and $[162,
14]$. For quark flavor mixing, the correct order of magnitude of the CKM matrix
elements can not be generated. Only the Cabibbo mixing is allowed even if we
impose very loose constraints $0.1\leq|\left(V_{CKM}\right)_{12}|\leq0.3$ and
$|\left(V_{CKM}\right)_{13}|\leq|\left(V_{CKM}\right)_{23}|<|\left(V_{CKM}\right)_{12}|$.
The group $\Delta(6\cdot7^2)$ can predict a Cabibbo angle $\theta_q=\pi/14$ in
good agreement with the best fit value. The groups which can give rise to both
phenomenologically viable lepton mixing angles and acceptable Cabibbo angle are
discussed, and the groups $\Delta(6\cdot9^2)$, $[648, 259]$, $[648, 260]$,
$[648, 266]$ and $\Delta(6\cdot14^2)$ are especially promising.
| [
{
"created": "Thu, 14 May 2015 16:57:22 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Nov 2015 01:53:58 GMT",
"version": "v2"
}
] | 2015-12-02 | [
[
"Yao",
"Chang-Yuan",
""
],
[
"Ding",
"Gui-Jun",
""
]
] | We perform a systematical and analytical study of lepton mixing which can be derived from the subgroups of $SU(3)$ under the assumption that neutrinos are Dirac particles. We find that type D groups can predict lepton mixing patterns compatible with the experimental data at $3\sigma$ level. The lepton mixing matrix turns out to be of the trimaximal form, and the Dirac CP violating phase is trivial. Moreover, we extend the flavor symmetry to the quark sector. The Cabibbo mixing between the first two generations of quarks can be generated by type D groups. Since all the finite subgroups of $U(3)$ which are not the subgroups of $SU(3)$ have not been classified, an exhaustive scan over all finite discrete groups up to order 2000 is performed with the help of the computer algebra system \texttt{GAP}. We find that only 90 (10) groups for Dirac (Majorana) neutrinos can generate the lepton mixing angles in the experimentally preferred ranges. The lepton mixing matrix is still the trimaximal pattern and the Dirac CP phase remains trivial. The smallest groups which lead to viable mixing angles are $[162, 10]$, $[162, 12]$ and $[162, 14]$. For quark flavor mixing, the correct order of magnitude of the CKM matrix elements can not be generated. Only the Cabibbo mixing is allowed even if we impose very loose constraints $0.1\leq|\left(V_{CKM}\right)_{12}|\leq0.3$ and $|\left(V_{CKM}\right)_{13}|\leq|\left(V_{CKM}\right)_{23}|<|\left(V_{CKM}\right)_{12}|$. The group $\Delta(6\cdot7^2)$ can predict a Cabibbo angle $\theta_q=\pi/14$ in good agreement with the best fit value. The groups which can give rise to both phenomenologically viable lepton mixing angles and acceptable Cabibbo angle are discussed, and the groups $\Delta(6\cdot9^2)$, $[648, 259]$, $[648, 260]$, $[648, 266]$ and $\Delta(6\cdot14^2)$ are especially promising. |
1804.05863 | Aneesh Manohar | Aneesh V. Manohar | Introduction to Effective Field Theories | 94 pages | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Lecture notes from the 2017 Les Houches Summer School on Effective Field
Theories. The lectures covered introductory material on EFTs as used in high
energy physics to compute experimentally observable quantities. Other lectures
at the school covered a wide range of applications in greater depth.
| [
{
"created": "Mon, 16 Apr 2018 18:01:13 GMT",
"version": "v1"
}
] | 2018-04-19 | [
[
"Manohar",
"Aneesh V.",
""
]
] | Lecture notes from the 2017 Les Houches Summer School on Effective Field Theories. The lectures covered introductory material on EFTs as used in high energy physics to compute experimentally observable quantities. Other lectures at the school covered a wide range of applications in greater depth. |
2010.04078 | Daniel Seipt | Daniel Seipt, Christopher P. Ridgers, Dario Del Sorbo, and Alec G. R.
Thomas | Polarized QED cascades | 31 pages, 5 figures | New J.Phys. 23, 053025 (2021) | 10.1088/1367-2630/abf584 | null | hep-ph physics.plasm-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | By taking the spin and polarization of the electrons, positrons and photons
into account in the strong-field QED processes of nonlinear Compton emission
and pair production, we find that the growth rate of QED cascades in
ultra-intense laser fields can be substantially reduced. While this means that
fewer particles are produced, we also found them to be highly polarized. We
further find that the high-energy tail of the particle spectra is polarized
opposite to that expected from Sokolov-Ternov theory, which cannot be explained
by just taking into account spin-asymmetries in the pair production process,
but results significantly from "spin-straggling". We employ a kinetic equation
approach for the electron, positron and photon distributions, each of them
spin/polarization-resolved, with the QED effects of photon emission and pair
production modelled by a spin/polarization dependent Boltzmann-type collision
operator. For photon-seeded cascades, depending on the photon polarization, we
find an excess or a shortage of particle production in the early stages of
cascade development, which provides a path towards a controlled experiment.
Throughout this paper we focus on rotating electric field configuration, which
represent an idealized model and allows for a straightforward interpretation of
the observed effects.
| [
{
"created": "Thu, 8 Oct 2020 16:02:22 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Apr 2021 07:54:38 GMT",
"version": "v2"
}
] | 2021-06-01 | [
[
"Seipt",
"Daniel",
""
],
[
"Ridgers",
"Christopher P.",
""
],
[
"Del Sorbo",
"Dario",
""
],
[
"Thomas",
"Alec G. R.",
""
]
] | By taking the spin and polarization of the electrons, positrons and photons into account in the strong-field QED processes of nonlinear Compton emission and pair production, we find that the growth rate of QED cascades in ultra-intense laser fields can be substantially reduced. While this means that fewer particles are produced, we also found them to be highly polarized. We further find that the high-energy tail of the particle spectra is polarized opposite to that expected from Sokolov-Ternov theory, which cannot be explained by just taking into account spin-asymmetries in the pair production process, but results significantly from "spin-straggling". We employ a kinetic equation approach for the electron, positron and photon distributions, each of them spin/polarization-resolved, with the QED effects of photon emission and pair production modelled by a spin/polarization dependent Boltzmann-type collision operator. For photon-seeded cascades, depending on the photon polarization, we find an excess or a shortage of particle production in the early stages of cascade development, which provides a path towards a controlled experiment. Throughout this paper we focus on rotating electric field configuration, which represent an idealized model and allows for a straightforward interpretation of the observed effects. |
hep-ph/0304016 | Elena Goubankova | Elena Gubankova, W. Vincent Liu and Frank Wilczek | Breached pairing superfluidity: Possible realization in QCD | 5 pages, latex, 1 figure; added references; Comment on Ref. [10]
changed | Phys.Rev.Lett. 91 (2003) 032001 | 10.1103/PhysRevLett.91.032001 | MIT-CTP #3357 | hep-ph cond-mat | null | We propose a wide universality class of gapless superfluids, and analyze a
limit that might be realized in quark matter at intermediate densities. In the
breached pairing color superconducting phase heavy $s$-quarks, with a small
Fermi surface, pair with light $u$ or $d$ quarks. The groundstate has a
superfluid and a normal Fermi component simultaneously. We expect a second
order phase transition, as a function of increasing density, from the breached
pairing phase to the conventional color-flavor locked (CFL) phase.
| [
{
"created": "Tue, 1 Apr 2003 22:51:43 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Apr 2003 21:36:59 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Gubankova",
"Elena",
""
],
[
"Liu",
"W. Vincent",
""
],
[
"Wilczek",
"Frank",
""
]
] | We propose a wide universality class of gapless superfluids, and analyze a limit that might be realized in quark matter at intermediate densities. In the breached pairing color superconducting phase heavy $s$-quarks, with a small Fermi surface, pair with light $u$ or $d$ quarks. The groundstate has a superfluid and a normal Fermi component simultaneously. We expect a second order phase transition, as a function of increasing density, from the breached pairing phase to the conventional color-flavor locked (CFL) phase. |
0910.0394 | Alexei P. Martynenko | E.N. Elekina, A.P. Martynenko (Samara State U.) | Relativistic effects in the double S- and P-wave charmonium production
in e^+e^- annihilation | 13 pages, 1 figure | Phys.Rev.D81:054006,2010 | 10.1103/PhysRevD.81.054006 | SSU-HEP-09/9 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | On the basis of perturbative QCD and the relativistic quark model we
calculate relativistic and bound state corrections in the production processes
of a pair of S-wave and P-wave charmonium states. Relativistic factors in the
production amplitude connected with the relative motion of heavy quarks and the
transformation law of the bound state wave function to the reference frame of
the moving S- and P-wave mesons are taken into account. For the gluon and quark
propagators entering the production vertex function we use a truncated
expansion in the ratio of the relative quark momenta to the center-of-mass
energy $\sqrt{s}$ up to the second order. The exact relativistic treatment of
the wave functions makes all such second order terms convergent, thus allowing
the reliable calculation of their contributions to the production cross
section. Relativistic corrections to the quark bound state wave functions in
the rest frame are considered by means of the Breit-like potential. It turns
out that the examined effects change essentially the nonrelativistic results of
the cross section for the reaction $e^++e^-\to J/\Psi(\eta_c)+\chi_{cJ}(h_c)$
at the center-of-mass energy $\sqrt{s}=10.6$ GeV.
| [
{
"created": "Fri, 2 Oct 2009 13:12:25 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Oct 2009 10:07:55 GMT",
"version": "v2"
}
] | 2010-04-06 | [
[
"Elekina",
"E. N.",
"",
"Samara State U."
],
[
"Martynenko",
"A. P.",
"",
"Samara State U."
]
] | On the basis of perturbative QCD and the relativistic quark model we calculate relativistic and bound state corrections in the production processes of a pair of S-wave and P-wave charmonium states. Relativistic factors in the production amplitude connected with the relative motion of heavy quarks and the transformation law of the bound state wave function to the reference frame of the moving S- and P-wave mesons are taken into account. For the gluon and quark propagators entering the production vertex function we use a truncated expansion in the ratio of the relative quark momenta to the center-of-mass energy $\sqrt{s}$ up to the second order. The exact relativistic treatment of the wave functions makes all such second order terms convergent, thus allowing the reliable calculation of their contributions to the production cross section. Relativistic corrections to the quark bound state wave functions in the rest frame are considered by means of the Breit-like potential. It turns out that the examined effects change essentially the nonrelativistic results of the cross section for the reaction $e^++e^-\to J/\Psi(\eta_c)+\chi_{cJ}(h_c)$ at the center-of-mass energy $\sqrt{s}=10.6$ GeV. |
0903.5047 | Chong Sheng Li | Hua Xing Zhu, Chong Sheng Li, Jia Jun Zhang, Hao Zhang, Zhao Li | Threshold Resummation Effects in Neutral Higgs Boson Production by
Bottom Quark Fusion at the CERN Large Hadron Collider | 29pages, 14 figures, version to appear in Physical Review D | Phys.Rev.D79:113005,2009 | 10.1103/PhysRevD.79.113005 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the QCD effects in the production of neutral Higgs bosons via
bottom quark fusion in both the standard model and the minimal supersymmetric
standard model at the CERN Large Hadron Collider. We include the
next-to-leading order (NLO) QCD corrections (including supersymmetric QCD) and
the threshold resummation effects. We use the soft-collinear effective theory
to resum the large logarithms near threshold from soft gluon emission. Our
results show that the resummation effects can enhance the total cross sections
by about 5% compared with the NLO results.
| [
{
"created": "Sun, 29 Mar 2009 13:48:22 GMT",
"version": "v1"
},
{
"created": "Thu, 21 May 2009 09:06:13 GMT",
"version": "v2"
}
] | 2014-11-18 | [
[
"Zhu",
"Hua Xing",
""
],
[
"Li",
"Chong Sheng",
""
],
[
"Zhang",
"Jia Jun",
""
],
[
"Zhang",
"Hao",
""
],
[
"Li",
"Zhao",
""
]
] | We investigate the QCD effects in the production of neutral Higgs bosons via bottom quark fusion in both the standard model and the minimal supersymmetric standard model at the CERN Large Hadron Collider. We include the next-to-leading order (NLO) QCD corrections (including supersymmetric QCD) and the threshold resummation effects. We use the soft-collinear effective theory to resum the large logarithms near threshold from soft gluon emission. Our results show that the resummation effects can enhance the total cross sections by about 5% compared with the NLO results. |
1606.08685 | Shigehiro Yasui | Atsushi Hosaka, Tetsuo Hyodo, Kazutaka Sudoh, Yasuhiro Yamaguchi,
Shigehiro Yasui | Heavy Hadrons in Nuclear Matter | 107 pages, 24 figures | Prog. Part. Nucl. Phys. 96 (2017) 88 | 10.1016/j.ppnp.2017.04.003 | J-PARC-TH-0055, YITP-16-82 | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Current studies on heavy hadrons in nuclear medium are reviewed with a
summary of the basic theoretical concepts of QCD, namely chiral symmetry, heavy
quark spin symmetry, and the effective Lagrangian approach. The nuclear matter
is an interesting place to study the properties of heavy hadrons from many
different points of view. We emphasize the importance of the following topics:
(i) charm/bottom hadron-nucleon interaction, (ii) structure of charm/bottom
nuclei, and (iii) QCD vacuum properties and hadron modifications in nuclear
medium. We pick up three different groups of heavy hadrons, quarkonia
($J/\psi$, $\Upsilon$), heavy-light mesons ($D$/$\bar{D}$, $\bar{B}$/$B$) and
heavy baryons ($\Lambda_{c}$, $\Lambda_{b}$). The modifications of those
hadrons in nuclear matter provide us with important information to investigate
the essential properties of heavy hadrons. We also give the discussions about
the heavy hadrons, not only in nuclear matter with infinite volume, but also in
atomic nuclei with finite baryon numbers, to serve future experiments.
| [
{
"created": "Tue, 28 Jun 2016 13:19:06 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Aug 2017 06:17:47 GMT",
"version": "v2"
}
] | 2019-08-07 | [
[
"Hosaka",
"Atsushi",
""
],
[
"Hyodo",
"Tetsuo",
""
],
[
"Sudoh",
"Kazutaka",
""
],
[
"Yamaguchi",
"Yasuhiro",
""
],
[
"Yasui",
"Shigehiro",
""
]
] | Current studies on heavy hadrons in nuclear medium are reviewed with a summary of the basic theoretical concepts of QCD, namely chiral symmetry, heavy quark spin symmetry, and the effective Lagrangian approach. The nuclear matter is an interesting place to study the properties of heavy hadrons from many different points of view. We emphasize the importance of the following topics: (i) charm/bottom hadron-nucleon interaction, (ii) structure of charm/bottom nuclei, and (iii) QCD vacuum properties and hadron modifications in nuclear medium. We pick up three different groups of heavy hadrons, quarkonia ($J/\psi$, $\Upsilon$), heavy-light mesons ($D$/$\bar{D}$, $\bar{B}$/$B$) and heavy baryons ($\Lambda_{c}$, $\Lambda_{b}$). The modifications of those hadrons in nuclear matter provide us with important information to investigate the essential properties of heavy hadrons. We also give the discussions about the heavy hadrons, not only in nuclear matter with infinite volume, but also in atomic nuclei with finite baryon numbers, to serve future experiments. |
1407.4121 | Yue Zhang | Mark B. Wise, Yue Zhang | Stable Bound States of Asymmetric Dark Matter | 16 pages, 7 figures | Phys. Rev. D 90, 055030 (2014) | 10.1103/PhysRevD.90.055030 | CALT-TH-2014-145 | hep-ph astro-ph.CO hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The simplest renormalizable effective field theories with asymmetric dark
matter bound states contain two additional gauge singlet fields one being the
dark matter and the other a mediator particle that the dark matter annihilates
into. We examine the physics of one such model with a Dirac fermion as the dark
matter and a real scalar mediator. For a range of parameters the Yukawa
coupling of the dark matter to the mediator gives rise to stable asymmetric
dark matter bound states. We derive properties of the bound states including
nuggets formed from $N\gg1$ dark matter particles. We also consider the
formation of bound states in the early universe and direct detection of dark
matter bound states. Many of our results also hold for symmetric dark matter.
| [
{
"created": "Tue, 15 Jul 2014 20:00:05 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Aug 2014 15:31:08 GMT",
"version": "v2"
},
{
"created": "Fri, 3 Oct 2014 23:41:27 GMT",
"version": "v3"
},
{
"created": "Sat, 7 Feb 2015 02:28:36 GMT",
"version": "v4"
},
{
"created": "Mon, 8 Aug 2016 22:14:41 GMT",
"version": "v5"
}
] | 2016-08-10 | [
[
"Wise",
"Mark B.",
""
],
[
"Zhang",
"Yue",
""
]
] | The simplest renormalizable effective field theories with asymmetric dark matter bound states contain two additional gauge singlet fields one being the dark matter and the other a mediator particle that the dark matter annihilates into. We examine the physics of one such model with a Dirac fermion as the dark matter and a real scalar mediator. For a range of parameters the Yukawa coupling of the dark matter to the mediator gives rise to stable asymmetric dark matter bound states. We derive properties of the bound states including nuggets formed from $N\gg1$ dark matter particles. We also consider the formation of bound states in the early universe and direct detection of dark matter bound states. Many of our results also hold for symmetric dark matter. |
1109.5378 | Pasquale Migliozzi Dr. | D. Autiero, P. Migliozzi and A. Russo | The neutrino velocity anomaly as an explanation of the missing
observation of neutrinos in coincidence with GRB | null | null | 10.1088/1475-7516/2011/11/026 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The search for neutrinos emitted in coincidence with Gamma-Bay Burst has been
so far unsuccessfully. In this paper we show that the recent result reported by
the OPERA Collaboration on an early arrival time of muon neutrinos with respect
to the one computed assuming the speed of light in vacuum could explain the
null search for neutrinos in coincidence with Gamma-Ray Burst.
| [
{
"created": "Sun, 25 Sep 2011 17:50:53 GMT",
"version": "v1"
}
] | 2015-05-30 | [
[
"Autiero",
"D.",
""
],
[
"Migliozzi",
"P.",
""
],
[
"Russo",
"A.",
""
]
] | The search for neutrinos emitted in coincidence with Gamma-Bay Burst has been so far unsuccessfully. In this paper we show that the recent result reported by the OPERA Collaboration on an early arrival time of muon neutrinos with respect to the one computed assuming the speed of light in vacuum could explain the null search for neutrinos in coincidence with Gamma-Ray Burst. |
hep-ph/0111019 | Jacinda S. M. Ginges | V.A. Dzuba, V.V. Flambaum, J.S.M. Ginges | Calculation of parity nonconservation in cesium and possible deviation
from the Standard Model | 18 pages, 10 figures | null | null | null | hep-ph physics.atom-ph | null | We have calculated the 6s-7s parity nonconserving E1 transition amplitude
(E_{PNC}) in cesium. This calculation has been performed with higher numerical
accuracy than our 1989 calculation [V.A. Dzuba, V.V. Flambaum, and O.P.
Sushkov, Phys. Lett. A {\bf 141}, 147]. Also the Breit interaction has been
included and the radiative corrections estimated. Our final result is
E_{PNC}=0.902 (1 +/- 0.7%)iea_{B}(Q_{W}/N). This represents an improvement in
the accuracy of the calculation from the 1% error claimed in 1989. This result
corresponds to a nuclear weak charge for Cs, Q_{W}=-72.39 (1 +/- 0.4% (exp) +/-
0.7% (theory)). We conclude that there is no significant deviation from the
Standard Model value -73.09(3).
| [
{
"created": "Fri, 2 Nov 2001 07:46:54 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Dzuba",
"V. A.",
""
],
[
"Flambaum",
"V. V.",
""
],
[
"Ginges",
"J. S. M.",
""
]
] | We have calculated the 6s-7s parity nonconserving E1 transition amplitude (E_{PNC}) in cesium. This calculation has been performed with higher numerical accuracy than our 1989 calculation [V.A. Dzuba, V.V. Flambaum, and O.P. Sushkov, Phys. Lett. A {\bf 141}, 147]. Also the Breit interaction has been included and the radiative corrections estimated. Our final result is E_{PNC}=0.902 (1 +/- 0.7%)iea_{B}(Q_{W}/N). This represents an improvement in the accuracy of the calculation from the 1% error claimed in 1989. This result corresponds to a nuclear weak charge for Cs, Q_{W}=-72.39 (1 +/- 0.4% (exp) +/- 0.7% (theory)). We conclude that there is no significant deviation from the Standard Model value -73.09(3). |
1410.4032 | Zhang Hong-Fei | Hong-Fei Zhang, Ling Yu, Shao-Xiang Zhang, Lan Jia | Global analysis of the experimental data on $\chi_c$ meson
hadroproduction | null | Phys. Rev. D 93, 054033 (2016) | 10.1103/PhysRevD.93.054033 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We carry out a global analysis of the experimental data on the $\chi_c$
production cross section and the ratio $\sigma(\chi_{c2})/\sigma(\chi_{c1})$ at
the LHC and the Tevatron. The related long-distance matrix elements (LDMEs) at
both leading order (LO) and next-to-leading order (NLO) in the QCD coupling
constant are renewed. We also present the transverse momentum distribution of
the $\chi_c$ production cross section and the ratio
$\sigma(\chi_{c2})/\sigma(\chi_{c1})$ for several experimental conditions and
find that NLO predictions agree with all sets of experimental data. By
contrast, at LO, one cannot explain all the data with a unique value of the
color-octet LDME. A brief analysis of the nonrelativistic QCD scale dependence
of the cross sections shows that, for the conditions we are concerned with in
this paper, the dependence can be almost totally absorbed into the LDME.
| [
{
"created": "Wed, 15 Oct 2014 12:13:08 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Nov 2014 12:34:26 GMT",
"version": "v2"
},
{
"created": "Fri, 6 Feb 2015 14:09:00 GMT",
"version": "v3"
},
{
"created": "Wed, 13 May 2015 14:28:56 GMT",
"version": "v4"
},
{
"created": "Wed, 16 Mar 2016 03:16:45 GMT",
"version": "v5"
}
] | 2016-03-30 | [
[
"Zhang",
"Hong-Fei",
""
],
[
"Yu",
"Ling",
""
],
[
"Zhang",
"Shao-Xiang",
""
],
[
"Jia",
"Lan",
""
]
] | We carry out a global analysis of the experimental data on the $\chi_c$ production cross section and the ratio $\sigma(\chi_{c2})/\sigma(\chi_{c1})$ at the LHC and the Tevatron. The related long-distance matrix elements (LDMEs) at both leading order (LO) and next-to-leading order (NLO) in the QCD coupling constant are renewed. We also present the transverse momentum distribution of the $\chi_c$ production cross section and the ratio $\sigma(\chi_{c2})/\sigma(\chi_{c1})$ for several experimental conditions and find that NLO predictions agree with all sets of experimental data. By contrast, at LO, one cannot explain all the data with a unique value of the color-octet LDME. A brief analysis of the nonrelativistic QCD scale dependence of the cross sections shows that, for the conditions we are concerned with in this paper, the dependence can be almost totally absorbed into the LDME. |
1603.05524 | Carla Terschl\"usen | Carla Terschl\"usen and Stefan Leupold (Uppsala U.) | Renormalisation of the low-energy constants of chiral perturbation
theory from loops with dynamical vector mesons | revised version, accepted for publication | Phys. Rev. D 94, 014021 (2016) | 10.1103/PhysRevD.94.014021 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Starting from a relativistic Lagrangian for pseudoscalar Goldstone bosons and
vector mesons in the antisymmetric tensor representation, a one-loop
calculation is performed to pin down the divergent structures that appear for
the effective low-energy action at chiral orders Q^2 and Q^4. The corresponding
renormalisation-scale dependences of all low-energy constants up to chiral
order Q^4 are determined. Calculations are carried out for both the
pseudoscalar octet and the pseudoscalar nonet, the latter in the framework of
chiral perturbation theory in the limit of a large number of colours.
| [
{
"created": "Thu, 17 Mar 2016 15:05:14 GMT",
"version": "v1"
},
{
"created": "Wed, 4 May 2016 08:24:48 GMT",
"version": "v2"
}
] | 2016-07-27 | [
[
"Terschlüsen",
"Carla",
"",
"Uppsala U."
],
[
"Leupold",
"Stefan",
"",
"Uppsala U."
]
] | Starting from a relativistic Lagrangian for pseudoscalar Goldstone bosons and vector mesons in the antisymmetric tensor representation, a one-loop calculation is performed to pin down the divergent structures that appear for the effective low-energy action at chiral orders Q^2 and Q^4. The corresponding renormalisation-scale dependences of all low-energy constants up to chiral order Q^4 are determined. Calculations are carried out for both the pseudoscalar octet and the pseudoscalar nonet, the latter in the framework of chiral perturbation theory in the limit of a large number of colours. |
hep-ph/9501347 | null | G. C. Branco, P. A. Parada and M. N. Rebelo | $D^0 - \bar D^0$ Mixing in the Presence of Isosinglet Quarks | 10 pages plus four figures. The figures are not included but are
available upon request | Phys.Rev.D52:4217-4222,1995 | 10.1103/PhysRevD.52.4217 | UWThPh-1994-51, CFIF-IST-4/94 | hep-ph | null | We analyse $\Delta C=2$ transitions in the framework of a minimal extension
of the Standard Model where either a $Q=2/3$ or a $Q=-1/3$ isosinglet quark is
added to the standard quark spectrum. In the case of a $Q=2/3$ isosinglet
quark, it is shown that there is a significant region of parameter space where
$D^0 - \bar D^0$ mixing is sufficiently enhanced to be observed at the next
round of experiments. On the contrary, in the case of a $Q=-1/3$ isosinglet
quark, it is pointed out that obtaining a substancial enhancement of $D^0 -
\bar D^0$ mixing, while complying with the experimental constraints on rare
kaon decays, requires a contrived choice of parameters.
| [
{
"created": "Fri, 20 Jan 1995 13:47:00 GMT",
"version": "v1"
}
] | 2010-11-01 | [
[
"Branco",
"G. C.",
""
],
[
"Parada",
"P. A.",
""
],
[
"Rebelo",
"M. N.",
""
]
] | We analyse $\Delta C=2$ transitions in the framework of a minimal extension of the Standard Model where either a $Q=2/3$ or a $Q=-1/3$ isosinglet quark is added to the standard quark spectrum. In the case of a $Q=2/3$ isosinglet quark, it is shown that there is a significant region of parameter space where $D^0 - \bar D^0$ mixing is sufficiently enhanced to be observed at the next round of experiments. On the contrary, in the case of a $Q=-1/3$ isosinglet quark, it is pointed out that obtaining a substancial enhancement of $D^0 - \bar D^0$ mixing, while complying with the experimental constraints on rare kaon decays, requires a contrived choice of parameters. |
0904.0700 | Amine Ahriche | Amine Ahriche (U. Jijel, U. Constantine & U. Bielefeld) | Sphalerons on Orbifolds | 10 pages, 4 figures. To appear in EPJC | Eur.Phys.J.C66:333-340,2010 | 10.1140/epjc/s10052-010-1234-5 | LPTh-Ji 09/002 | hep-ph | http://creativecommons.org/licenses/by/3.0/ | In this work, we study the electroweak sphalerons in a 5D background, where
the fifth dimension lies on an interval. We consider two specific cases: flat
space-time and the anti-de Sitter space-time compactified on S^{1}/Z_{2}. In
our work, we take the SU(2) gauge-Higgs model, where the gauge fields reside in
the 5D bulk; but the Higgs doublet is confined in one brane. We find that the
results in this model are close to those of the 4D Standard Model (SM). The
existence of the warp effect, as well as the heaviness of the gauge
Kaluza-Klein modes make the results extremely close to the SM ones.
| [
{
"created": "Sat, 4 Apr 2009 10:26:19 GMT",
"version": "v1"
},
{
"created": "Fri, 8 Jan 2010 19:56:32 GMT",
"version": "v2"
}
] | 2010-03-19 | [
[
"Ahriche",
"Amine",
"",
"U. Jijel, U. Constantine & U. Bielefeld"
]
] | In this work, we study the electroweak sphalerons in a 5D background, where the fifth dimension lies on an interval. We consider two specific cases: flat space-time and the anti-de Sitter space-time compactified on S^{1}/Z_{2}. In our work, we take the SU(2) gauge-Higgs model, where the gauge fields reside in the 5D bulk; but the Higgs doublet is confined in one brane. We find that the results in this model are close to those of the 4D Standard Model (SM). The existence of the warp effect, as well as the heaviness of the gauge Kaluza-Klein modes make the results extremely close to the SM ones. |
hep-ph/0111222 | Abhijit Samanta | Amitava Datta and Abhijit Samanta (Jadavpur University) | Electroweak Precision Data, Light Sleptons and Stability of the SUSY
Scalar Potential | Plain Latex, 17 pages, 5 postscript figure | Phys.Lett. B526 (2002) 111-120 | 10.1016/S0370-2693(01)01490-3 | null | hep-ph | null | The light slepton-sneutrino scenario with non-universal scalar masses at the
GUT scale is preferred by the electroweak precision data. Though a universal
soft breaking mass at or below the Plank scale can produce the required
non-universality at the GUT scale through running, such models are in conflict
with the stability of the electroweak symmetry breaking vacuum. If the
supergravity motivated idea of a common scalar mass at some high scale along
with light sleptons is supported by future experiments that may indicate that
we are living in a false vacuum. In contrast SO(10) D-terms, which may arise if
this GUT group breaks down directly to the Standard Model, can lead to this
spectrum with many striking phenomenological predictions, without jeopardizing
vacuum stability.
| [
{
"created": "Mon, 19 Nov 2001 10:42:53 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Datta",
"Amitava",
"",
"Jadavpur University"
],
[
"Samanta",
"Abhijit",
"",
"Jadavpur University"
]
] | The light slepton-sneutrino scenario with non-universal scalar masses at the GUT scale is preferred by the electroweak precision data. Though a universal soft breaking mass at or below the Plank scale can produce the required non-universality at the GUT scale through running, such models are in conflict with the stability of the electroweak symmetry breaking vacuum. If the supergravity motivated idea of a common scalar mass at some high scale along with light sleptons is supported by future experiments that may indicate that we are living in a false vacuum. In contrast SO(10) D-terms, which may arise if this GUT group breaks down directly to the Standard Model, can lead to this spectrum with many striking phenomenological predictions, without jeopardizing vacuum stability. |
0806.4389 | Oscar Vives | G Barenboim, O. Vives (U.Valencia-IFIC) | About a (standard model) universe dominated by the right matter | 14 pages, 3 figures. References on late time enthropy release
included, several points clarified | Phys.Rev.D79:033007,2009 | 10.1103/PhysRevD.79.033007 | FTUV-08-0626, IFIC-08-22 | hep-ph astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the phenomenology of a prolonged early epoch of matter domination
by an unstable but very long-lived massive particle. This new matter domination
era can help to relax some of the requirements on the primordial inflation. Its
main effect is the huge entropy production produced by the decays of such
particle that can dilute any possible unwanted relic, as the gravitino in
supersymmetric models, and thus relax the constraints on the inflationary
reheating temperature. Furthermore, a long period of matter domination reduces
the number of $e$-foldings after the horizon crossing by observable
perturbations and therefore the requirements on flatness of the inflationary
potential. A natural candidate for such heavy, long-lived particle already
present in the Standard Model of the electroweak interactions would be a heavy
right-handed neutrino. In this case, we show that its decays can also generate
the observed baryon asymmetry with right-handed neutrino masses well above the
bound from gravitino overproduction.
| [
{
"created": "Thu, 26 Jun 2008 20:10:40 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Jul 2008 15:43:33 GMT",
"version": "v2"
},
{
"created": "Wed, 19 Nov 2008 17:30:01 GMT",
"version": "v3"
}
] | 2009-02-20 | [
[
"Barenboim",
"G",
"",
"U.Valencia-IFIC"
],
[
"Vives",
"O.",
"",
"U.Valencia-IFIC"
]
] | We analyze the phenomenology of a prolonged early epoch of matter domination by an unstable but very long-lived massive particle. This new matter domination era can help to relax some of the requirements on the primordial inflation. Its main effect is the huge entropy production produced by the decays of such particle that can dilute any possible unwanted relic, as the gravitino in supersymmetric models, and thus relax the constraints on the inflationary reheating temperature. Furthermore, a long period of matter domination reduces the number of $e$-foldings after the horizon crossing by observable perturbations and therefore the requirements on flatness of the inflationary potential. A natural candidate for such heavy, long-lived particle already present in the Standard Model of the electroweak interactions would be a heavy right-handed neutrino. In this case, we show that its decays can also generate the observed baryon asymmetry with right-handed neutrino masses well above the bound from gravitino overproduction. |
1107.4770 | Sebastian Cassel | S. Cassel | Naturalness of electroweak physics within minimal supergravity | 148 pages, D. Phil. Thesis, Oxford University | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Low energy supersymmetry is motivated by its use as a solution to the
hierarchy problem of the electroweak scale. Having motivated this model with
naturalness arguments, it is then necessary to check whether the experimentally
allowed parameter space permits realisations of the model with low fine tuning.
The scope of this thesis is a study of naturalness of the electroweak physics
in the minimal supergravity model. The latest experimental constraints are
applied, and the fine tuning is quantitatively evaluated for a scan across the
parameter space. The fine tuning of the electroweak scale is evaluated at
2-loop order, and the fine tuning of the neutralino dark matter thermal relic
energy density is also determined. The natural regions of the parameter space
are identified and the associated phenomenology relevant for detection
discussed. Naturalness limits are also found for the parameter space and
spectrum. The minimum fine tuning found is 1 part in 9 when dark matter
constraints are neglected, and 1 part in 15 when dark matter constraints are
satisfied. For both cases, the minimum fine tuning is found for a Higgs mass of
115 GeV irrespective of whether the Higgs mass constraint is applied or not.
The most natural spectrum includes light superpartner fermions, and heavy
superpartner scalars. Minimal supergravity currently remains viable with
respect to naturalness and a natural realisation may be discovered within the
next couple of years.
| [
{
"created": "Sun, 24 Jul 2011 16:45:25 GMT",
"version": "v1"
}
] | 2011-07-26 | [
[
"Cassel",
"S.",
""
]
] | Low energy supersymmetry is motivated by its use as a solution to the hierarchy problem of the electroweak scale. Having motivated this model with naturalness arguments, it is then necessary to check whether the experimentally allowed parameter space permits realisations of the model with low fine tuning. The scope of this thesis is a study of naturalness of the electroweak physics in the minimal supergravity model. The latest experimental constraints are applied, and the fine tuning is quantitatively evaluated for a scan across the parameter space. The fine tuning of the electroweak scale is evaluated at 2-loop order, and the fine tuning of the neutralino dark matter thermal relic energy density is also determined. The natural regions of the parameter space are identified and the associated phenomenology relevant for detection discussed. Naturalness limits are also found for the parameter space and spectrum. The minimum fine tuning found is 1 part in 9 when dark matter constraints are neglected, and 1 part in 15 when dark matter constraints are satisfied. For both cases, the minimum fine tuning is found for a Higgs mass of 115 GeV irrespective of whether the Higgs mass constraint is applied or not. The most natural spectrum includes light superpartner fermions, and heavy superpartner scalars. Minimal supergravity currently remains viable with respect to naturalness and a natural realisation may be discovered within the next couple of years. |
hep-ph/0310004 | Hongshi Zong | Hong-shi Zong, Shi Qi, Wei Chen, Wei-min Sun, and En-guang Zhao | Pion susceptibility of the QCD vacuum from an effective quark-quark
interaction | 13 pages, 2 figures | Phys.Lett. B576 (2003) 289-296 | 10.1016/j.physletb.2003.09.099 | null | hep-ph | null | A modified method for calculating the pion vacuum susceptibility from an
effective quark-quark interaction model is derived. Within this approach it is
shown that the pion vacuum susceptibility is free of ultraviolet divergence and
is much smaller than the previous estimations.
| [
{
"created": "Wed, 1 Oct 2003 01:52:41 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Zong",
"Hong-shi",
""
],
[
"Qi",
"Shi",
""
],
[
"Chen",
"Wei",
""
],
[
"Sun",
"Wei-min",
""
],
[
"Zhao",
"En-guang",
""
]
] | A modified method for calculating the pion vacuum susceptibility from an effective quark-quark interaction model is derived. Within this approach it is shown that the pion vacuum susceptibility is free of ultraviolet divergence and is much smaller than the previous estimations. |
hep-ph/9503426 | null | J. Ellis | Where are we coming from? What are we? Where are we going? | Invited talk at the Beyond the Standard Model IV Conference,
Granlibakken, California, December 1994. Figures available from MNFT3 at
CERNVM.CERN.CH | Nucl.Phys. B456 (1995) 699-731 | null | CERN-TH.95-28 | hep-ph | null | The Standard Model is the answer to questions 1 and 2, as established by LEP.
Supersymmetry is doubtless the answer to question 3, as may well be established
by the LHC.
| [
{
"created": "Fri, 24 Mar 1995 16:05:48 GMT",
"version": "v1"
}
] | 2009-09-25 | [
[
"Ellis",
"J.",
""
]
] | The Standard Model is the answer to questions 1 and 2, as established by LEP. Supersymmetry is doubtless the answer to question 3, as may well be established by the LHC. |
2108.01674 | Yibei Li | Yibei Li, Ian Moult, Solange Schrijnder van Velzen, Wouter J.
Waalewijn, Hua Xing Zhu | Extending Precision Perturbative QCD with Track Functions | 5 pages, 3 figures + Supplemental Material | Phys. Rev. Lett. 128, 182001 (2022) | 10.1103/PhysRevLett.128.182001 | null | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Collider experiments often exploit information about the quantum numbers of
final state hadrons to maximize their sensitivity, with applications ranging
from the use of tracking information (electric charge) for precision jet
substructure measurements, to flavor tagging for nucleon structure studies. For
such measurements, perturbative calculations in terms of quarks and gluons are
insufficient, and non-perturbative track functions describing the energy
fraction of a quark or gluon converted into a subset of hadrons (e.g., charged
hadrons) must be incorporated. Unlike fragmentation functions, track functions
describe correlations between hadrons and therefore satisfy complicated
non-linear evolution equations whose structure has so far eluded calculation
beyond the leading order. In this Letter, we develop an understanding of track
functions and their interplay with energy flow observables beyond the leading
order, allowing them to be used in state-of-the-art perturbative calculations
for the first time. We identify a shift symmetry in the evolution of their
moments that fixes their structure, and we explicitly compute the evolution of
the first three moments at next-to-leading order, allowing for the description
of up to three-point energy correlations. We then calculate the two-point
energy correlator on charged particles at $O(\alpha_s^2)$, illustrating
explicitly that infrared singularities in perturbation theory are absorbed by
moments of the track functions and also highlighting how these moments
seamlessly interplay with modern techniques for perturbative calculations. Our
results extend the boundaries of traditional perturbative QCD, enabling
precision perturbative predictions for energy flow observables sensitive to the
quantum numbers of hadronic states.
| [
{
"created": "Tue, 3 Aug 2021 18:00:02 GMT",
"version": "v1"
},
{
"created": "Wed, 4 May 2022 08:28:29 GMT",
"version": "v2"
}
] | 2022-05-05 | [
[
"Li",
"Yibei",
""
],
[
"Moult",
"Ian",
""
],
[
"van Velzen",
"Solange Schrijnder",
""
],
[
"Waalewijn",
"Wouter J.",
""
],
[
"Zhu",
"Hua Xing",
""
]
] | Collider experiments often exploit information about the quantum numbers of final state hadrons to maximize their sensitivity, with applications ranging from the use of tracking information (electric charge) for precision jet substructure measurements, to flavor tagging for nucleon structure studies. For such measurements, perturbative calculations in terms of quarks and gluons are insufficient, and non-perturbative track functions describing the energy fraction of a quark or gluon converted into a subset of hadrons (e.g., charged hadrons) must be incorporated. Unlike fragmentation functions, track functions describe correlations between hadrons and therefore satisfy complicated non-linear evolution equations whose structure has so far eluded calculation beyond the leading order. In this Letter, we develop an understanding of track functions and their interplay with energy flow observables beyond the leading order, allowing them to be used in state-of-the-art perturbative calculations for the first time. We identify a shift symmetry in the evolution of their moments that fixes their structure, and we explicitly compute the evolution of the first three moments at next-to-leading order, allowing for the description of up to three-point energy correlations. We then calculate the two-point energy correlator on charged particles at $O(\alpha_s^2)$, illustrating explicitly that infrared singularities in perturbation theory are absorbed by moments of the track functions and also highlighting how these moments seamlessly interplay with modern techniques for perturbative calculations. Our results extend the boundaries of traditional perturbative QCD, enabling precision perturbative predictions for energy flow observables sensitive to the quantum numbers of hadronic states. |
hep-ph/0207199 | E. P. S. Shellard | Y. Lemperiere and E.P.S. Shellard | On the Behaviour and Stability of Superconducting Currents | 18 pages, 6 figures. To be submitted to Nuclear Physics B | Nucl.Phys. B649 (2003) 511-525 | 10.1016/S0550-3213(02)01028-3 | null | hep-ph astro-ph hep-th | null | We present analytic and numerical results for the evolution of currents on
superconducting strings in the classical $U(1) \times U(1)$ model. We derive an
energy functional for the currents and charges on these strings, establishing
rigorously that minima should exist in this model for loops of finite size
(vortons) if both charge and current are present on the worldsheet. We then
study the stability of the currents on these strings, and we find an analytic
criterion for the onset of instability (in the neutral limit). This limit
specifies a lower maximal current than previous heuristic estimates. We
conclude with a discussion of the evolution of loops towards their final vorton
state in the model under consideration.
| [
{
"created": "Tue, 16 Jul 2002 18:54:15 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Feb 2003 16:41:11 GMT",
"version": "v2"
}
] | 2010-04-05 | [
[
"Lemperiere",
"Y.",
""
],
[
"Shellard",
"E. P. S.",
""
]
] | We present analytic and numerical results for the evolution of currents on superconducting strings in the classical $U(1) \times U(1)$ model. We derive an energy functional for the currents and charges on these strings, establishing rigorously that minima should exist in this model for loops of finite size (vortons) if both charge and current are present on the worldsheet. We then study the stability of the currents on these strings, and we find an analytic criterion for the onset of instability (in the neutral limit). This limit specifies a lower maximal current than previous heuristic estimates. We conclude with a discussion of the evolution of loops towards their final vorton state in the model under consideration. |
1706.01339 | Yue Yang | Y. Yang, J. P. Kneller, and K. M. Perkins | Multi-flavor effects in Stimulated Transitions of Neutrinos | 11 pages, 5 figures. arXiv admin note: substantial text overlap with
arXiv:1510.01998 | null | null | null | hep-ph astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A neutrino subject to an external, time-dependent perturbing potential can be
forced to make transitions between its flavor states. A neutrino with three (or
more) flavors can exhibit phenomena that cannot occur if the neutrino had just
two. We present an approximate analytic solution for the temporal evolution of
a multi-flavor neutrino in response to an arbitrary perturbing Hamiltonian that
has been decomposed into its Fourier modes. We impose no restriction upon the
number of flavors nor upon the structure of the perturbing Hamiltonian, the
number of Fourier modes, their amplitude or their frequencies. We apply the
theory to study three-flavor neutrino transformation due to perturbations built
from two and three Fourier modes. For the case of two Fourier modes we observe
the equivalent of "induced transparency" from quantum optics whereby
transitions between a given pair of states are suppressed due to the presence
of a resonant mode between another pair. When we add a third Fourier mode we
find a new effect whereby the third mode can manipulate the transition
probabilities of the two mode case so as to force complete transparency or,
alternatively, restore "opacity" meaning the perturbative potential regains its
ability to induce neutrino transitions. In both applications we demonstrate how
the analytic solutions are able to match the amplitude and wavenumber of the
numerical results to within a few percent.
| [
{
"created": "Thu, 1 Jun 2017 20:25:01 GMT",
"version": "v1"
}
] | 2018-02-20 | [
[
"Yang",
"Y.",
""
],
[
"Kneller",
"J. P.",
""
],
[
"Perkins",
"K. M.",
""
]
] | A neutrino subject to an external, time-dependent perturbing potential can be forced to make transitions between its flavor states. A neutrino with three (or more) flavors can exhibit phenomena that cannot occur if the neutrino had just two. We present an approximate analytic solution for the temporal evolution of a multi-flavor neutrino in response to an arbitrary perturbing Hamiltonian that has been decomposed into its Fourier modes. We impose no restriction upon the number of flavors nor upon the structure of the perturbing Hamiltonian, the number of Fourier modes, their amplitude or their frequencies. We apply the theory to study three-flavor neutrino transformation due to perturbations built from two and three Fourier modes. For the case of two Fourier modes we observe the equivalent of "induced transparency" from quantum optics whereby transitions between a given pair of states are suppressed due to the presence of a resonant mode between another pair. When we add a third Fourier mode we find a new effect whereby the third mode can manipulate the transition probabilities of the two mode case so as to force complete transparency or, alternatively, restore "opacity" meaning the perturbative potential regains its ability to induce neutrino transitions. In both applications we demonstrate how the analytic solutions are able to match the amplitude and wavenumber of the numerical results to within a few percent. |
hep-ph/9311373 | Evan Reidell | P.F. Kelly | Parameterisation (and Gauge) Invariance of the Transition Temperature | 7 pages in plain TeX, MIT-CTP-2258 | null | null | null | hep-ph | null | The so-called Unitary Gauge Puzzle is re-examined in the light of a set of
gauge dependence identities discovered by Kobes, Kunstatter and Rebhan. The
``puzzle'' is discovered to arise as an artifact of the gauge-variant and
off-shell nature of the Effective Potential. An explicit analysis of the scalar
sector of the Abelian Higgs model shows that the correct physical result is
obtained in all cases provided that the calculation is performed
self-consistently, and the result is evaluated on-shell.
| [
{
"created": "Mon, 29 Nov 1993 21:51:49 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kelly",
"P. F.",
""
]
] | The so-called Unitary Gauge Puzzle is re-examined in the light of a set of gauge dependence identities discovered by Kobes, Kunstatter and Rebhan. The ``puzzle'' is discovered to arise as an artifact of the gauge-variant and off-shell nature of the Effective Potential. An explicit analysis of the scalar sector of the Abelian Higgs model shows that the correct physical result is obtained in all cases provided that the calculation is performed self-consistently, and the result is evaluated on-shell. |
hep-ph/0408337 | Dr. Rukmani Mohanta | A.K.Giri, R.Mohanta | Can there be any new physics in b -> d penguins | Published version | JHEP0411:084,2004 | 10.1088/1126-6708/2004/11/084 | null | hep-ph | null | We analyze the possibility of observing new physics effects in the $b \to d$
penguin amplitudes. For this purpose, we consider the decay mode $B \to K^0
\bar K^0 $, which has only $b \to d$ penguin contributions. Using the QCD
factorization approach, we find very tiny CP violating effects in the standard
model for this process. Furthermore, we show that the minimal supersymmetric
standard model with $LR$ mass insertion and R-parity violating supersymmetric
model can provide substantial CP violation effects. Observation of sizable CP
violation in this mode would be a clear signal of new physics.
| [
{
"created": "Mon, 30 Aug 2004 16:47:06 GMT",
"version": "v1"
},
{
"created": "Wed, 1 Sep 2004 05:17:16 GMT",
"version": "v2"
},
{
"created": "Wed, 29 Dec 2004 03:09:59 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Giri",
"A. K.",
""
],
[
"Mohanta",
"R.",
""
]
] | We analyze the possibility of observing new physics effects in the $b \to d$ penguin amplitudes. For this purpose, we consider the decay mode $B \to K^0 \bar K^0 $, which has only $b \to d$ penguin contributions. Using the QCD factorization approach, we find very tiny CP violating effects in the standard model for this process. Furthermore, we show that the minimal supersymmetric standard model with $LR$ mass insertion and R-parity violating supersymmetric model can provide substantial CP violation effects. Observation of sizable CP violation in this mode would be a clear signal of new physics. |
2204.01961 | Yin Huang | Zhong-Yi Jian, Hong Qiang Zhu, Feng Yang, Qi-Hui Chen, Yin Huang, and
Jun He | Molecular states from $\bar{B}^{(*)}N$ interactions | null | null | null | null | hep-ph nucl-th | http://creativecommons.org/licenses/by/4.0/ | In 2019, two new structures $\Lambda_b(6146)$ and $\Lambda_b(6152)$ were
observed by the LHCb Collaboration at the invariant mass spectrum of
$\Lambda_b^0\pi^{+}\pi^{-}$, which aroused a hot discussion about their inner
structures. The $\Lambda_b(6146)$ and $\Lambda_b(6152)$ might still be
molecular states because their masses are close to threshold of a $\bar{B}$
meson and a nucleon. In this work, we perform a systematical investigation of
possible heavy baryonic molecular states from the $\bar{B}N$ interaction. Since
the $\bar{B}N$ channel strongly couples to the $\bar{B}^{*}N$ channel, the
possible $\bar{B}N-\bar{B}^{*}N$ bound states are also studied. The interaction
of the system considered is described by the $t$-channel $\sigma$, $\pi$,
$\eta$ ,$\omega$, and $\rho$ mesons exchanges. By solving the non-relativistic
Schr\"{o}dinger equation with the obtained one-boson-exchange potentials, the
$\bar{B}^{(*)}N$ bound states with different quantum numbers are searched. The
calculation suggests that recently observed $\Lambda_b(6146)$ can be assigned
as a $P$-wave $\bar{B}N$ molecular state with spin parity $J^P=3/2^{+}$ or a
$\bar{B}N-\bar{B}^{*}N$ bound state. However, assignment of $\Lambda_b(6152)$
as an $F$-wave $\bar{B}N$ molecular is disfavored. The $\Lambda_b(6152)$ can be
explained as meson-baryon molecular state with a small $\bar{B}N$ component.
The calculation also predict the existence of two $S$-wave
$\bar{B}N-\bar{B}^{*}N$ bound states that can be related to the experimentally
observed $\Lambda_b(5912)$ and $\Lambda_b(5920)$.
| [
{
"created": "Tue, 5 Apr 2022 03:33:08 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Apr 2022 07:09:37 GMT",
"version": "v2"
},
{
"created": "Sun, 19 Jun 2022 02:54:07 GMT",
"version": "v3"
}
] | 2022-06-22 | [
[
"Jian",
"Zhong-Yi",
""
],
[
"Zhu",
"Hong Qiang",
""
],
[
"Yang",
"Feng",
""
],
[
"Chen",
"Qi-Hui",
""
],
[
"Huang",
"Yin",
""
],
[
"He",
"Jun",
""
]
] | In 2019, two new structures $\Lambda_b(6146)$ and $\Lambda_b(6152)$ were observed by the LHCb Collaboration at the invariant mass spectrum of $\Lambda_b^0\pi^{+}\pi^{-}$, which aroused a hot discussion about their inner structures. The $\Lambda_b(6146)$ and $\Lambda_b(6152)$ might still be molecular states because their masses are close to threshold of a $\bar{B}$ meson and a nucleon. In this work, we perform a systematical investigation of possible heavy baryonic molecular states from the $\bar{B}N$ interaction. Since the $\bar{B}N$ channel strongly couples to the $\bar{B}^{*}N$ channel, the possible $\bar{B}N-\bar{B}^{*}N$ bound states are also studied. The interaction of the system considered is described by the $t$-channel $\sigma$, $\pi$, $\eta$ ,$\omega$, and $\rho$ mesons exchanges. By solving the non-relativistic Schr\"{o}dinger equation with the obtained one-boson-exchange potentials, the $\bar{B}^{(*)}N$ bound states with different quantum numbers are searched. The calculation suggests that recently observed $\Lambda_b(6146)$ can be assigned as a $P$-wave $\bar{B}N$ molecular state with spin parity $J^P=3/2^{+}$ or a $\bar{B}N-\bar{B}^{*}N$ bound state. However, assignment of $\Lambda_b(6152)$ as an $F$-wave $\bar{B}N$ molecular is disfavored. The $\Lambda_b(6152)$ can be explained as meson-baryon molecular state with a small $\bar{B}N$ component. The calculation also predict the existence of two $S$-wave $\bar{B}N-\bar{B}^{*}N$ bound states that can be related to the experimentally observed $\Lambda_b(5912)$ and $\Lambda_b(5920)$. |
2012.07758 | Rui Santos | Duarte Azevedo, Pedro M. Ferreira, Heather E. Logan, Rui Santos | Vacuum structure of the $\mathbb{Z}_2$ symmetric Georgi-Machacek model | 22 pages | null | 10.1007/JHEP03(2021)221 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We discuss the vacuum structure of a version of the Georgi-Machecek model
with an exact $\mathbb{Z}_2$ symmetry acting on the triplet fields. Besides the
usual custodial-symmetric model, with $\rho=1$ at tree-level, a model with a
dark matter candidate is also viable. The other phases of the model lead to
electric charge breaking, a wrong pattern of electroweak symmetry breaking or
to $\rho \neq 1$ at tree-level. We derive conditions to have an absolute
minimum in each of the two viable phases, the custodial and the dark matter
phases.
| [
{
"created": "Mon, 14 Dec 2020 17:54:18 GMT",
"version": "v1"
}
] | 2021-04-07 | [
[
"Azevedo",
"Duarte",
""
],
[
"Ferreira",
"Pedro M.",
""
],
[
"Logan",
"Heather E.",
""
],
[
"Santos",
"Rui",
""
]
] | We discuss the vacuum structure of a version of the Georgi-Machecek model with an exact $\mathbb{Z}_2$ symmetry acting on the triplet fields. Besides the usual custodial-symmetric model, with $\rho=1$ at tree-level, a model with a dark matter candidate is also viable. The other phases of the model lead to electric charge breaking, a wrong pattern of electroweak symmetry breaking or to $\rho \neq 1$ at tree-level. We derive conditions to have an absolute minimum in each of the two viable phases, the custodial and the dark matter phases. |
1409.5262 | Miguel Sanchis | Miguel-Angel Sanchis-Lozano and Edward Sarkisyan-Grinbaum | Searching for hidden sectors in multiparticle production at the LHC | Presentation given at ICHEP 2014 Valencia | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Most signatures of new physics in colliders have been studied so far on the
transverse plane with respect to the beam direction. In this work however we
study the impact of a hidden sector beyond the Standard Model (SM) on inclusive
(pseudo)rapidity correlations and moments of the multiplicity distributions,
with special emphasis in the LHC results.
| [
{
"created": "Thu, 18 Sep 2014 11:13:05 GMT",
"version": "v1"
}
] | 2014-09-19 | [
[
"Sanchis-Lozano",
"Miguel-Angel",
""
],
[
"Sarkisyan-Grinbaum",
"Edward",
""
]
] | Most signatures of new physics in colliders have been studied so far on the transverse plane with respect to the beam direction. In this work however we study the impact of a hidden sector beyond the Standard Model (SM) on inclusive (pseudo)rapidity correlations and moments of the multiplicity distributions, with special emphasis in the LHC results. |
hep-ph/9403213 | Meunier Jean Louis | P.Duloos and J.-L. Meunier | Generalised Factorial Moments and QCD Jets | 11pages 4 figures uuencode, LATEC, INLN 94/6 | Z.Phys. C64 (1994) 295-300 | 10.1007/BF01557401 | null | hep-ph | null | { In this paper we present a natural and comprehensive generalisation of the
standard factorial moments ($\clFq$) analysis of a multiplicity distribution.
The Generalised Factorial Moments are defined for all $q$ in the complex plane
and, as far as the negative part of its spectrum is concerned, could be useful
for the study of infrared structure of the Strong Interactions Theory of high
energy interactions (LEP multiplicity distribution under the ${\cal Z}_0$). The
QCD calculation of the Generalised Factorial Moments for negative $q$ is
performed in the double leading log accuracy and is compared to OPAL
experimental data. The role played by the infrared cut-off of the model is
discussed and illustrated with a Monte Carlo calculation. }
| [
{
"created": "Wed, 2 Mar 1994 14:59:31 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Duloos",
"P.",
""
],
[
"Meunier",
"J. -L.",
""
]
] | { In this paper we present a natural and comprehensive generalisation of the standard factorial moments ($\clFq$) analysis of a multiplicity distribution. The Generalised Factorial Moments are defined for all $q$ in the complex plane and, as far as the negative part of its spectrum is concerned, could be useful for the study of infrared structure of the Strong Interactions Theory of high energy interactions (LEP multiplicity distribution under the ${\cal Z}_0$). The QCD calculation of the Generalised Factorial Moments for negative $q$ is performed in the double leading log accuracy and is compared to OPAL experimental data. The role played by the infrared cut-off of the model is discussed and illustrated with a Monte Carlo calculation. } |
2201.06108 | Selcuk Bilmis | S.Bilmis | Strong and electromagnetic decays of the radially excited $D_s$ and
$B_s$ mesons in light cone QCD sum rules | null | Eur. Phys. J. C 81, 893 (2021) | 10.1140/epjc/s10052-021-09683-8 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Recently, LHCb Collaboration announced the discovery of radial excitations of
$D_s$ and $B_s$ mesons. In present work, we calculate the most promising strong
and electromagnetic decay widths of radially excited $D_s(2S)$ and $B_s(2S)$
mesons within the light cone QCD sum rules method.
| [
{
"created": "Sun, 16 Jan 2022 18:22:22 GMT",
"version": "v1"
}
] | 2022-01-19 | [
[
"Bilmis",
"S.",
""
]
] | Recently, LHCb Collaboration announced the discovery of radial excitations of $D_s$ and $B_s$ mesons. In present work, we calculate the most promising strong and electromagnetic decay widths of radially excited $D_s(2S)$ and $B_s(2S)$ mesons within the light cone QCD sum rules method. |
2303.15670 | Heikki M\"antysaari | Heikki M\"antysaari | Diffractive scattering at next-to-leading order in the dipole picture | 8 pages, 4 figures, contribution to the proceedings of the XXIX
Cracow Epiphany Conference | null | null | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss recent developments towards next-to-leading order (NLO) accuracy
in the dipole picture. We review recent NLO results for exclusive vector meson
production and diffractive structure functions, and discuss how it is becoming
possible to describe both inclusive and exclusive DIS data simultaneously
within the Color Glass Condensate framework at NLO accuracy. These developments
will make it possible to probe the gluon saturation phenomena in detail
especially when nuclear-DIS data from the EIC become available.
| [
{
"created": "Tue, 28 Mar 2023 01:26:25 GMT",
"version": "v1"
}
] | 2023-03-29 | [
[
"Mäntysaari",
"Heikki",
""
]
] | We discuss recent developments towards next-to-leading order (NLO) accuracy in the dipole picture. We review recent NLO results for exclusive vector meson production and diffractive structure functions, and discuss how it is becoming possible to describe both inclusive and exclusive DIS data simultaneously within the Color Glass Condensate framework at NLO accuracy. These developments will make it possible to probe the gluon saturation phenomena in detail especially when nuclear-DIS data from the EIC become available. |
2204.11945 | Rahul Srivastava | Aditya Batra, ShivaSankar K.A, Sanjoy Mandal, Hemant Prajapati, Rahul
Srivastava | CDF-II $W$ Boson Mass Anomaly in the Canonical Scotogenic Neutrino-Dark
Matter Model | 36 pages, 15 figures, 3 tables, new analysis added, matches published
version | null | 10.1142/S0217732323500906 | null | hep-ph hep-ex | http://creativecommons.org/licenses/by-nc-sa/4.0/ | The CDF-II collaboration's recent high-precision measurement of $W$ boson
mass indicates new physics contribution(s) beyond the Standard Model. We
investigate the possibility of the well-known canonical Scotogenic model to
explain the CDF-II measurement. The Scotogenic model is a popular scenario
beyond the Standard Model that induces neutrino masses at the 1-loop level and
includes a viable dark matter candidate, either scalar or fermionic. For both
scalar and fermionic dark matter possibilities, we simultaneously examine the
constraints coming from (a) neutrino mass, oscillation, neutrinoless double
beta decay and lepton flavour violation experiments, (b) from LEP and LHC (c)
from dark matter relic density and direct detection experiments (d) from the
oblique $S,T,U$ parameter values consistent with CDF-II $W$ boson measurement.
We demonstrate that the new CDF-II measurement rules out the feasible parameter
space of the scalar dark matter in the high mass regions ($m_{\eta_{R}} \gtrsim
500~\text{GeV}$), while still allowing the intermediate mass regions
$54~\text{GeV} \lesssim m_{\eta_{R}} \lesssim 76~\text{GeV}$. We also showed
that the fermionic dark matter candidate in the canonical Scotogenic model, in
the range $M_{N_{1}} \lesssim 500~\text{GeV} $ , can simultaneously explain all
the aforementioned issues. Furthermore, we investigated how the recent findings
from ATLAS 2023 impact this study.
| [
{
"created": "Mon, 25 Apr 2022 19:52:10 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Sep 2023 06:51:31 GMT",
"version": "v2"
}
] | 2023-09-08 | [
[
"Batra",
"Aditya",
""
],
[
"A",
"ShivaSankar K.",
""
],
[
"Mandal",
"Sanjoy",
""
],
[
"Prajapati",
"Hemant",
""
],
[
"Srivastava",
"Rahul",
""
]
] | The CDF-II collaboration's recent high-precision measurement of $W$ boson mass indicates new physics contribution(s) beyond the Standard Model. We investigate the possibility of the well-known canonical Scotogenic model to explain the CDF-II measurement. The Scotogenic model is a popular scenario beyond the Standard Model that induces neutrino masses at the 1-loop level and includes a viable dark matter candidate, either scalar or fermionic. For both scalar and fermionic dark matter possibilities, we simultaneously examine the constraints coming from (a) neutrino mass, oscillation, neutrinoless double beta decay and lepton flavour violation experiments, (b) from LEP and LHC (c) from dark matter relic density and direct detection experiments (d) from the oblique $S,T,U$ parameter values consistent with CDF-II $W$ boson measurement. We demonstrate that the new CDF-II measurement rules out the feasible parameter space of the scalar dark matter in the high mass regions ($m_{\eta_{R}} \gtrsim 500~\text{GeV}$), while still allowing the intermediate mass regions $54~\text{GeV} \lesssim m_{\eta_{R}} \lesssim 76~\text{GeV}$. We also showed that the fermionic dark matter candidate in the canonical Scotogenic model, in the range $M_{N_{1}} \lesssim 500~\text{GeV} $ , can simultaneously explain all the aforementioned issues. Furthermore, we investigated how the recent findings from ATLAS 2023 impact this study. |
1605.09563 | Georg Wolschin | Georg Wolschin | Beyond the thermal model in relativistic heavy-ion collisions | 9 pages, 8 figures | Phys. Rev. C 94, 024911 (2016) | 10.1103/PhysRevC.94.024911 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Deviations from thermal distribution functions of produced particles in
relativistic heavy-ion collisions are discussed as indicators for
nonequilibrium processes. The focus is on rapidity distributions of produced
charged hadrons as functions of collision energy and centrality which are used
to infer the fraction of produced particles from a central fireball as compared
to the one from the fragmentation sources that are out of equilibrium with the
rest of the system. Overall thermal equilibrium would only be reached for large
times t -> infinity.
| [
{
"created": "Tue, 31 May 2016 10:30:25 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Jun 2016 13:43:29 GMT",
"version": "v2"
}
] | 2016-08-18 | [
[
"Wolschin",
"Georg",
""
]
] | Deviations from thermal distribution functions of produced particles in relativistic heavy-ion collisions are discussed as indicators for nonequilibrium processes. The focus is on rapidity distributions of produced charged hadrons as functions of collision energy and centrality which are used to infer the fraction of produced particles from a central fireball as compared to the one from the fragmentation sources that are out of equilibrium with the rest of the system. Overall thermal equilibrium would only be reached for large times t -> infinity. |
1307.2825 | Emmanuel de Oliveira | E.G. de Oliveira, A.D. Martin, F.S. Navarra, M.G. Ryskin | Unintegrated parton distributions in nuclei | 9 pages, 4 figures | null | 10.1007/JHEP09(2013)158 | IPPP/13/34, DCPT/13/68 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study how unintegrated parton distributions in nuclei can be calculated
from the corresponding integrated partons using the EPS09 parametrization. The
role of nuclear effects is presented in terms of the ratio
$R^A=\text{uPDF}^A/A\cdot \text{PDF}^N$ for both large and small $x$ domains.
| [
{
"created": "Wed, 10 Jul 2013 15:20:45 GMT",
"version": "v1"
}
] | 2015-06-16 | [
[
"de Oliveira",
"E. G.",
""
],
[
"Martin",
"A. D.",
""
],
[
"Navarra",
"F. S.",
""
],
[
"Ryskin",
"M. G.",
""
]
] | We study how unintegrated parton distributions in nuclei can be calculated from the corresponding integrated partons using the EPS09 parametrization. The role of nuclear effects is presented in terms of the ratio $R^A=\text{uPDF}^A/A\cdot \text{PDF}^N$ for both large and small $x$ domains. |
1905.08605 | Yanrui Liu | Jian-Bo Cheng, Yan-Rui Liu | $P_c(4457)^+$, $P_c(4440)^+$, and $P_c(4312)^+$: molecules or compact
pentaquarks? | 15 pages, 2 figures, 8 tables. Version accepted by PRD | Phys. Rev. D 100, 054002 (2019) | 10.1103/PhysRevD.100.054002 | null | hep-ph hep-ex hep-lat nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a chromomagnetic model, we analyse the properties of the newly observed
$P_c(4457)^+$, $P_c(4440)^+$, and $P_c(4312)^+$ states. We estimate the masses
of the $(uud)_{8_c}(c\bar{c})_{8_c}$ and $(uds)_{8_c}(c\bar{c})_{8_c}$
pentaquark states by considering the isospin breaking effects. Their values are
determined by calculating mass distances from the $\Sigma_c^{++}D^-$ and
$\Xi_c^{\prime+}D^-$ thresholds, respectively. It is found that the isospin
breaking effects on the spectrum are small. From the uncertainty consideration
and the rearrangement decay properties in a simple model, we find that it is
possible to assign the $P_c(4457)^+$, $P_c(4440)^+$, and $P_c(4312)^+$ as
$J^P=3/2^-$, $1/2^-$, and $3/2^-$ pentaquark states, respectively. The
assignment in the molecule picture can be different, in particular for the
$P_c(4312)^+$. The information from open-charm channels, e.g. ${\cal
B}[P_c\to\Sigma_c^{++}D^-]/{\cal B}[P_c\to J/\psi p]$, will play an important
role in distinguishing the inner structures of the $P_c$ states. Discussions
and predictions based on the calculations are also given.
| [
{
"created": "Tue, 21 May 2019 13:22:12 GMT",
"version": "v1"
},
{
"created": "Sun, 18 Aug 2019 02:35:49 GMT",
"version": "v2"
}
] | 2019-09-11 | [
[
"Cheng",
"Jian-Bo",
""
],
[
"Liu",
"Yan-Rui",
""
]
] | In a chromomagnetic model, we analyse the properties of the newly observed $P_c(4457)^+$, $P_c(4440)^+$, and $P_c(4312)^+$ states. We estimate the masses of the $(uud)_{8_c}(c\bar{c})_{8_c}$ and $(uds)_{8_c}(c\bar{c})_{8_c}$ pentaquark states by considering the isospin breaking effects. Their values are determined by calculating mass distances from the $\Sigma_c^{++}D^-$ and $\Xi_c^{\prime+}D^-$ thresholds, respectively. It is found that the isospin breaking effects on the spectrum are small. From the uncertainty consideration and the rearrangement decay properties in a simple model, we find that it is possible to assign the $P_c(4457)^+$, $P_c(4440)^+$, and $P_c(4312)^+$ as $J^P=3/2^-$, $1/2^-$, and $3/2^-$ pentaquark states, respectively. The assignment in the molecule picture can be different, in particular for the $P_c(4312)^+$. The information from open-charm channels, e.g. ${\cal B}[P_c\to\Sigma_c^{++}D^-]/{\cal B}[P_c\to J/\psi p]$, will play an important role in distinguishing the inner structures of the $P_c$ states. Discussions and predictions based on the calculations are also given. |
2207.02222 | Guo-Yuan Huang | Guo-yuan Huang | Double and multiple bangs at tau neutrino telescopes: A novel probe of
sphalerons with cosmogenic neutrinos | 8 pages + references, 6 figures, the version published in EPJC | Eur. Phys. J. C 82 (2022) 1089 | 10.1140/epjc/s10052-022-11052-y | null | hep-ph astro-ph.HE hep-ex | http://creativecommons.org/licenses/by/4.0/ | In light of the exciting campaign of cosmogenic neutrino detection, we
investigate the double and multiple tau bangs detectable at future tau neutrino
telescopes. Such events are expected from the Standard Model (SM) higher-order
processes, which can be easily identified with broad techniques anticipated at
future tau neutrino telescopes. We find that SM perturbative processes can
already contribute observable double-bang events to telescopes with a
sensitivity of collecting $\mathcal{O}(100)$ cosmogenic neutrino events. The
detectable but suppressed rate in fact makes the double and multiple bangs an
excellent probe of SM unknowns and possible new physics beyond. As a case
study, the nonperturbative sphaleron process, which can copiously produce
multiple tau bangs, is explored.
| [
{
"created": "Tue, 5 Jul 2022 18:00:01 GMT",
"version": "v1"
},
{
"created": "Sun, 10 Jul 2022 18:18:18 GMT",
"version": "v2"
},
{
"created": "Fri, 9 Dec 2022 13:52:25 GMT",
"version": "v3"
}
] | 2022-12-12 | [
[
"Huang",
"Guo-yuan",
""
]
] | In light of the exciting campaign of cosmogenic neutrino detection, we investigate the double and multiple tau bangs detectable at future tau neutrino telescopes. Such events are expected from the Standard Model (SM) higher-order processes, which can be easily identified with broad techniques anticipated at future tau neutrino telescopes. We find that SM perturbative processes can already contribute observable double-bang events to telescopes with a sensitivity of collecting $\mathcal{O}(100)$ cosmogenic neutrino events. The detectable but suppressed rate in fact makes the double and multiple bangs an excellent probe of SM unknowns and possible new physics beyond. As a case study, the nonperturbative sphaleron process, which can copiously produce multiple tau bangs, is explored. |
hep-ph/0207348 | Emilio Torrente-Lujan | P. Aliani, V. Antonelli, M. Picariello, E. Torrente-Lujan | KamLAND potentiality on the determination of Neutrino mixing parameters
in the post SNO-NC era | IFUM-345-FT,FTUAM-02-765 | NewJ.Phys.5:2,2003 | 10.1088/1367-2630/5/1/302 | null | hep-ph | null | We study in detail the power of the reactor experiment kamLAND for
discriminating existing solutions to the SNP and giving accurate information on
neutrino masses and mixing angles. Assuming the expected signal corresponding
to various ``benchmark'' points in the 2 dimensional $(\Delta m^2,\tan^2
\theta)$ mixing plane, we develop a full-fledged $\chi^2$ analysis which
includes KamLAND spectrum and all the existing solar evidence. A complete
modelling of statistical and known systematics errors for 1 and 3 years of data
taking is also included, exclusion plots are presented.
We find a much higher sensitivity especially for values of $\Delta m^2$ lying
in the central part of the LMA region. The situation would be more complicate
for values closer to the border of the LMA region (the so called HLMA region,
i.e. $\Delta m^2 \leq 2 \times 10^{5}$ and $\Delta m^2 \geq 8-9 \times 10^{-5}$
or $tan^2 \theta$ far from $\tan^2 \theta = 0.5$). In this case kamLAND, with
or without solar evidence, will be able only to select multiple regions in the
parameter space, in the sense that different possible values of the parameters
would produce the same signal.
| [
{
"created": "Mon, 29 Jul 2002 20:46:51 GMT",
"version": "v1"
},
{
"created": "Wed, 31 Jul 2002 14:01:56 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Aliani",
"P.",
""
],
[
"Antonelli",
"V.",
""
],
[
"Picariello",
"M.",
""
],
[
"Torrente-Lujan",
"E.",
""
]
] | We study in detail the power of the reactor experiment kamLAND for discriminating existing solutions to the SNP and giving accurate information on neutrino masses and mixing angles. Assuming the expected signal corresponding to various ``benchmark'' points in the 2 dimensional $(\Delta m^2,\tan^2 \theta)$ mixing plane, we develop a full-fledged $\chi^2$ analysis which includes KamLAND spectrum and all the existing solar evidence. A complete modelling of statistical and known systematics errors for 1 and 3 years of data taking is also included, exclusion plots are presented. We find a much higher sensitivity especially for values of $\Delta m^2$ lying in the central part of the LMA region. The situation would be more complicate for values closer to the border of the LMA region (the so called HLMA region, i.e. $\Delta m^2 \leq 2 \times 10^{5}$ and $\Delta m^2 \geq 8-9 \times 10^{-5}$ or $tan^2 \theta$ far from $\tan^2 \theta = 0.5$). In this case kamLAND, with or without solar evidence, will be able only to select multiple regions in the parameter space, in the sense that different possible values of the parameters would produce the same signal. |
hep-ph/9604352 | Thorsten Ohl | Christopher Balzereit and Thorsten Ohl (Th Darmstadt) | Heavy Quark Effective Field Theory at O(1/m_Q^2). I. QCD Corrections to
the Lagrangian | 11 pages, LaTeX (using amsmath.sty) | Phys.Lett. B386 (1996) 335-340 | 10.1016/0370-2693(96)00947-1 | IKDA 96/11 | hep-ph | null | We present a new calculation of the renormalized HQET Lagrangian at order
O(1/m_Q^2) and discuss the consequences of the BRST invariance of QCD and the
reparameterization invariance of HQET. Our result corrects earlier, conflicting
calculations and sets the stage for the calculation of the renormalized
currents at order O(1/m_Q^2).
| [
{
"created": "Thu, 18 Apr 1996 12:48:37 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Balzereit",
"Christopher",
"",
"Th Darmstadt"
],
[
"Ohl",
"Thorsten",
"",
"Th Darmstadt"
]
] | We present a new calculation of the renormalized HQET Lagrangian at order O(1/m_Q^2) and discuss the consequences of the BRST invariance of QCD and the reparameterization invariance of HQET. Our result corrects earlier, conflicting calculations and sets the stage for the calculation of the renormalized currents at order O(1/m_Q^2). |
hep-ph/9507325 | Verma Ramesh C. | R. C. Verma | SU(3)-Flavor-Analysis of Nonfactorizable Contributions to $D \to Pp$
Decays | Latex, 13 pages | Phys.Lett. B365 (1996) 377-382 | 10.1016/0370-2693(95)01249-4 | Panjab University, May 18, 1995 | hep-ph | null | We study charm D - meson decays to two pseudoscalar mesons in Cabibbo favored
mode employing SU(3)-flavor for the nonfactorizable matrix elements. Using
$D\rightarrow \bar K \pi$ and $D_{s} \rightarrow \bar K K$ to fix the reduced
matrix elements, we obtain a consistent fit for $ \eta$ and $ \eta'$ emitting
decays of $D$ and $ D_{s}$ mesons.
| [
{
"created": "Tue, 18 Jul 1995 07:33:43 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Verma",
"R. C.",
""
]
] | We study charm D - meson decays to two pseudoscalar mesons in Cabibbo favored mode employing SU(3)-flavor for the nonfactorizable matrix elements. Using $D\rightarrow \bar K \pi$ and $D_{s} \rightarrow \bar K K$ to fix the reduced matrix elements, we obtain a consistent fit for $ \eta$ and $ \eta'$ emitting decays of $D$ and $ D_{s}$ mesons. |
0803.1744 | Jan Nemchik | Jan Nemchik (IEP SAS, Slovakia and Tech. U., Prague, Czech Republic) | Nuclear shadowing in the light-cone dipole approach | 16 pages, 5 figures, talk given at the Workshop on High-pT Physics at
LHC (LHC07), Jyvaskyla, Finland, 23-27 Mar 2007. Published in PoS(LHC07)028 | PoSLHC07:028,2007 | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study nuclear shadowing at small Bjorken x < 0.01 in the color dipole
approach. Such a light-cone quantum-chromodynamics formalism based on the Green
function technique incorporates naturally color transparency and coherence
length effects. The nuclear shadowing for the barq-q Fock component of the
photon is calculated using exact numerical solution of the evolution equation
for the Green function. At x < 0.01 we demonstrate that a contribution of
higher Fock states containing gluons to overall nuclear shadowing becomes
effective. Numerical results for nuclear shadowing are compared with available
data from the E665 and NMC collaborations. Model calculations are finally
tested with the results obtained from other models.
| [
{
"created": "Wed, 12 Mar 2008 11:01:53 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Nemchik",
"Jan",
"",
"IEP SAS, Slovakia and Tech. U., Prague, Czech Republic"
]
] | We study nuclear shadowing at small Bjorken x < 0.01 in the color dipole approach. Such a light-cone quantum-chromodynamics formalism based on the Green function technique incorporates naturally color transparency and coherence length effects. The nuclear shadowing for the barq-q Fock component of the photon is calculated using exact numerical solution of the evolution equation for the Green function. At x < 0.01 we demonstrate that a contribution of higher Fock states containing gluons to overall nuclear shadowing becomes effective. Numerical results for nuclear shadowing are compared with available data from the E665 and NMC collaborations. Model calculations are finally tested with the results obtained from other models. |
hep-ph/9904457 | Gabriele Umberto Varieschi | Graciela Gelmini, Paolo Gondolo, Gabriele Varieschi | Prompt atmospheric neutrinos and muons: NLO vs LO QCD predictions | 28 pages including 6 figures | Phys.Rev.D61:036005,2000 | 10.1103/PhysRevD.61.036005 | UCLA/99/TEP/15, MPI-PhT/99-17 | hep-ph | null | We compare the leading and next-to-leading order QCD predictions for the flux
of atmospheric muons and neutrinos from decays of charmed particles. We find
that the full NLO lepton fluxes can be approximated to within 10% by the
Born--level fluxes multiplied by an overall factor of 2.2-2.4, which depends
slightly on the PDF. This supports the approach in Thunman, Ingelman, Gondolo
(1996). We also find that their very low lepton fluxes are due to the mild
slope they used for the gluon distribution function at small momentum
fractions, and that substantially larger lepton fluxes result when the slope of
the gluon distribution function at small momentum fractions is larger.
| [
{
"created": "Mon, 26 Apr 1999 23:20:53 GMT",
"version": "v1"
}
] | 2011-07-19 | [
[
"Gelmini",
"Graciela",
""
],
[
"Gondolo",
"Paolo",
""
],
[
"Varieschi",
"Gabriele",
""
]
] | We compare the leading and next-to-leading order QCD predictions for the flux of atmospheric muons and neutrinos from decays of charmed particles. We find that the full NLO lepton fluxes can be approximated to within 10% by the Born--level fluxes multiplied by an overall factor of 2.2-2.4, which depends slightly on the PDF. This supports the approach in Thunman, Ingelman, Gondolo (1996). We also find that their very low lepton fluxes are due to the mild slope they used for the gluon distribution function at small momentum fractions, and that substantially larger lepton fluxes result when the slope of the gluon distribution function at small momentum fractions is larger. |
0811.4242 | Erik Bartos | E. Bartos, E. A. Kuraev, M. Secansky | Radiative corrections to muon decay in leading and next to leading
approximation for electron spectrum | 4 pages, 1 figure | Phys.Part.Nucl.Lett.6:365-367,2009 | 10.1134/S1547477109050033 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have noted that the electron spectrum of muon decay in the leading
logarithmic approximation calculated in two lowest orders of the perturbation
theory in the paper of Berman (1958), can be reproduced by the parton language.
This fact permits one to generalize the result to all orders of the
perturbation theory using the structure function method.
| [
{
"created": "Wed, 26 Nov 2008 07:59:25 GMT",
"version": "v1"
}
] | 2010-01-08 | [
[
"Bartos",
"E.",
""
],
[
"Kuraev",
"E. A.",
""
],
[
"Secansky",
"M.",
""
]
] | We have noted that the electron spectrum of muon decay in the leading logarithmic approximation calculated in two lowest orders of the perturbation theory in the paper of Berman (1958), can be reproduced by the parton language. This fact permits one to generalize the result to all orders of the perturbation theory using the structure function method. |
hep-ph/9211209 | Donald Shaw | Donald S. Shaw and Ray R. Volkas | Systematic Study of Fermion Masses and Mixing Angles in Horizontal SU(2)
Gauge Theory | 43 pages, 4 figures (available by postal mail on request), OZ-92/08 | Phys.Rev. D47 (1993) 241-255 | 10.1103/PhysRevD.47.241 | null | hep-ph | null | Despite its great success in explaining the basic interactions of nature, the
standard model suffers from an inability to explain the observed masses of the
fundamental particles and the weak mixing angles between them. We shall survey
a set of possible extensions to the standard model, employing an SU(2)
``horizontal'' gauge symmetry between the particle generations, to see what
light they can shed on this problem.
| [
{
"created": "Wed, 4 Nov 1992 06:44:33 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Shaw",
"Donald S.",
""
],
[
"Volkas",
"Ray R.",
""
]
] | Despite its great success in explaining the basic interactions of nature, the standard model suffers from an inability to explain the observed masses of the fundamental particles and the weak mixing angles between them. We shall survey a set of possible extensions to the standard model, employing an SU(2) ``horizontal'' gauge symmetry between the particle generations, to see what light they can shed on this problem. |
1812.01009 | Nuno Rosa Agostinho | Eduardo da Silva Almeida, Alexandre Alves, N. Rosa Agostinho, Oscar J.
P. \'Eboli, M.C.Gonzalez-Garcia | Electroweak Sector Under Scrutiny: A Combined Analysis of LHC and
Electroweak Precision Data | 19 pages, 7 figures, 3 tables | Phys. Rev. D 99, 033001 (2019) | 10.1103/PhysRevD.99.033001 | YITP-SB-18-39 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We perform a comprehensive study of the Higgs couplings, gauge-boson
couplings to fermions and triple gauge boson vertices. We work in the framework
of effective theories including the effects of the dimension-six operators
contributing to these observables. We determine the presently allowed range for
the coefficients of these operators via a 20 parameter global fit to the
electroweak precision data, as well as electroweak diboson and Higgs production
data from LHC Run 1 and 2. We quantify the improvement on the determination of
the 20 Wilson coefficients by the inclusion of the Run 2 results. In particular
we present a novel analysis of the ATLAS Run 2 36.1 $\rm fb^{-1}$ data on the
transverse mass distribution of $W^+W^-$ and $W^\pm Z$ in the leptonic channel
which allow for stronger tests of the triple gauge boson vertices. We discuss
the discrete (quasi)-degeneracies existing in the parameter space of operator
coefficients relevant for the Higgs couplings to fermions and gauge bosons. In
particular we show how the inclusion of the incipient $tH$ data can break those
degeneracies in the determination of the top-Higgs coupling. We also discuss
and quantify the effect of keeping the terms quadratic in the Wilson
coefficients in the analysis and we show the importance of the Higgs data to
constrain some of the operators that modify the triple gauge boson couplings in
the linear regime.
| [
{
"created": "Mon, 3 Dec 2018 19:00:00 GMT",
"version": "v1"
}
] | 2019-02-13 | [
[
"Almeida",
"Eduardo da Silva",
""
],
[
"Alves",
"Alexandre",
""
],
[
"Agostinho",
"N. Rosa",
""
],
[
"Éboli",
"Oscar J. P.",
""
],
[
"Gonzalez-Garcia",
"M. C.",
""
]
] | We perform a comprehensive study of the Higgs couplings, gauge-boson couplings to fermions and triple gauge boson vertices. We work in the framework of effective theories including the effects of the dimension-six operators contributing to these observables. We determine the presently allowed range for the coefficients of these operators via a 20 parameter global fit to the electroweak precision data, as well as electroweak diboson and Higgs production data from LHC Run 1 and 2. We quantify the improvement on the determination of the 20 Wilson coefficients by the inclusion of the Run 2 results. In particular we present a novel analysis of the ATLAS Run 2 36.1 $\rm fb^{-1}$ data on the transverse mass distribution of $W^+W^-$ and $W^\pm Z$ in the leptonic channel which allow for stronger tests of the triple gauge boson vertices. We discuss the discrete (quasi)-degeneracies existing in the parameter space of operator coefficients relevant for the Higgs couplings to fermions and gauge bosons. In particular we show how the inclusion of the incipient $tH$ data can break those degeneracies in the determination of the top-Higgs coupling. We also discuss and quantify the effect of keeping the terms quadratic in the Wilson coefficients in the analysis and we show the importance of the Higgs data to constrain some of the operators that modify the triple gauge boson couplings in the linear regime. |
1603.00192 | Masaatsu Horikoshi | Yugo Abe, Masaatsu Horikoshi and Takeo Inami | Quantum gravity corrections to the standard model Higgs in Einstein and
$R^2$ gravity | 6pages, 4figures, Proceedings for the 2nd LeCosPA Symposium:
Everything about gravity, Talk delivered by M. Horikoshi on December 17,
2015, Taipei, Taiwan | null | 10.1142/9789813203952_0052 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We evaluate quantum gravity corrections to the standard model Higgs potential
$V(\phi)$ a la Coleman-Weinberg and examine the stability question of $V(\phi)$
at scales of Planck mass $M_{\rm Pl}$. We compute the gravity one-loop
corrections by using the momentum cut-off in Einstein gravity. The gravity
corrections affect the potential in a significant manner for the value of
$\Lambda= (1 - 3)M_{\rm Pl}.$ In view of reducing the UV cut-off dependence we
also make a similar study in the $R^2$ gravity.
| [
{
"created": "Tue, 1 Mar 2016 09:11:27 GMT",
"version": "v1"
}
] | 2019-02-27 | [
[
"Abe",
"Yugo",
""
],
[
"Horikoshi",
"Masaatsu",
""
],
[
"Inami",
"Takeo",
""
]
] | We evaluate quantum gravity corrections to the standard model Higgs potential $V(\phi)$ a la Coleman-Weinberg and examine the stability question of $V(\phi)$ at scales of Planck mass $M_{\rm Pl}$. We compute the gravity one-loop corrections by using the momentum cut-off in Einstein gravity. The gravity corrections affect the potential in a significant manner for the value of $\Lambda= (1 - 3)M_{\rm Pl}.$ In view of reducing the UV cut-off dependence we also make a similar study in the $R^2$ gravity. |
hep-ph/9412265 | Matthias Neubert | Matthias Neubert (CERN) | Scale Setting in QCD and the Momentum Flow in Feynman Diagrams | eqs.(51) and (83) corrected, minor typographic changes made | Phys.Rev.D51:5924-5941,1995 | 10.1103/PhysRevD.51.5924 | CERN-TH.7487/94 | hep-ph | null | We present a formalism to evaluate QCD diagrams with a single virtual gluon
using a running coupling constant at the vertices. This method, which
corresponds to an all-order resummation of certain terms in a perturbative
series, provides a description of the momentum flow through the gluon
propagator. It can be viewed as a generalization of the scale-setting
prescription of Brodsky, Lepage and Mackenzie to all orders in perturbation
theory. In particular, the approach can be used to investigate why in some
cases the ``typical'' momenta in a loop diagram are different from the
``natural'' scale of the process. It offers an intuitive understanding of the
appearance of infrared renormalons in perturbation theory and their connection
to the rate of convergence of a perturbative series. Moreover, it allows one to
separate short- and long-distance contributions by introducing a hard
factorization scale. Several applications to one- and two-scale problems are
discussed in detail.
| [
{
"created": "Fri, 9 Dec 1994 10:23:47 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Dec 1994 17:46:09 GMT",
"version": "v2"
}
] | 2010-11-01 | [
[
"Neubert",
"Matthias",
"",
"CERN"
]
] | We present a formalism to evaluate QCD diagrams with a single virtual gluon using a running coupling constant at the vertices. This method, which corresponds to an all-order resummation of certain terms in a perturbative series, provides a description of the momentum flow through the gluon propagator. It can be viewed as a generalization of the scale-setting prescription of Brodsky, Lepage and Mackenzie to all orders in perturbation theory. In particular, the approach can be used to investigate why in some cases the ``typical'' momenta in a loop diagram are different from the ``natural'' scale of the process. It offers an intuitive understanding of the appearance of infrared renormalons in perturbation theory and their connection to the rate of convergence of a perturbative series. Moreover, it allows one to separate short- and long-distance contributions by introducing a hard factorization scale. Several applications to one- and two-scale problems are discussed in detail. |
1512.01001 | Katarzyna Krajewska | F. Cajiao V\'elez, K. Krajewska, and J. Z. Kami\'nski | Electron dressed mass in short laser pulses and its measurement | 7 pages, 4 figures; lecture delivered during the 24th International
Laser Physics Workshop, Shanghai, August 21-25, 2015 | null | null | null | hep-ph physics.acc-ph physics.optics physics.plasm-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The concept of the electron mass dressing by a powerful laser pulse is
discussed. It is shown, by considering the coherent frequency combs generated
out of the Compton radiation, how the electron dressed mass can be determined
experimentally. This also opens a possibility to measure properties of
extremely intense pulses for which the previously developed methods, working at
moderate intensities, are not applicable. Namely, one can determine these
properties from the properties of coherent Compton radiation.
| [
{
"created": "Thu, 3 Dec 2015 09:17:12 GMT",
"version": "v1"
}
] | 2015-12-04 | [
[
"Vélez",
"F. Cajiao",
""
],
[
"Krajewska",
"K.",
""
],
[
"Kamiński",
"J. Z.",
""
]
] | The concept of the electron mass dressing by a powerful laser pulse is discussed. It is shown, by considering the coherent frequency combs generated out of the Compton radiation, how the electron dressed mass can be determined experimentally. This also opens a possibility to measure properties of extremely intense pulses for which the previously developed methods, working at moderate intensities, are not applicable. Namely, one can determine these properties from the properties of coherent Compton radiation. |
hep-ph/0405233 | Willy Van Neerven wvn | V. Ravindran, J. Smith, W.L. van Neerven | NNLO Corrections to the Polarized Drell-Yan Coefficient Function | 5 pages, 5 figures, 7th DESY Workshop on Elementary Particle Theory,
Loops and Legs in Quantum Field Theory, Zinnowitz, Germany, April 25-30, 2004 | null | 10.1016/j.nuclphysbps.2004.09.003 | null | hep-ph | null | We present the full next-to-next-to-leading order (NNLO) corrections to the
coefficient function for the polarized cross section $d \Delta\sigma/d Q$ of
the Drell-Yan process. We study the effect of these corrections on the process
$p+p\to l^+l^-+`X'$ at an C.M. energy $\sqrt{S}=200 GeV$. All QCD partonic
subprocesses have been included provided the lepton pair is created by a
virtual photon, which is a valid approximation for a lepton pair invariant mass
$Q<50 GeV$. For this reaction the dominant subprocess is given by $q+\bar q\to
\gamma^*+`X'$ and its higher order corrections so that it provides us with an
excellent tool to measure the polarized sea-quark densities.
| [
{
"created": "Mon, 24 May 2004 15:14:48 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Ravindran",
"V.",
""
],
[
"Smith",
"J.",
""
],
[
"van Neerven",
"W. L.",
""
]
] | We present the full next-to-next-to-leading order (NNLO) corrections to the coefficient function for the polarized cross section $d \Delta\sigma/d Q$ of the Drell-Yan process. We study the effect of these corrections on the process $p+p\to l^+l^-+`X'$ at an C.M. energy $\sqrt{S}=200 GeV$. All QCD partonic subprocesses have been included provided the lepton pair is created by a virtual photon, which is a valid approximation for a lepton pair invariant mass $Q<50 GeV$. For this reaction the dominant subprocess is given by $q+\bar q\to \gamma^*+`X'$ and its higher order corrections so that it provides us with an excellent tool to measure the polarized sea-quark densities. |
1504.02569 | Mikko Laine | J. Ghiglieri, M. Laine | Gravitational wave background from Standard Model physics: Qualitative
features | 19 pages. v2: clarifications and references added, published version | JCAP 1507 (2015) 022 | 10.1088/1475-7516/2015/07/022 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Because of physical processes ranging from microscopic particle collisions to
macroscopic hydrodynamic fluctuations, any plasma in thermal equilibrium emits
gravitational waves. For the largest wavelengths the emission rate is
proportional to the shear viscosity of the plasma. In the Standard Model at T >
160 GeV, the shear viscosity is dominated by the most weakly interacting
particles, right-handed leptons, and is relatively large. We estimate the order
of magnitude of the corresponding spectrum of gravitational waves. Even though
at small frequencies (corresponding to the sub-Hz range relevant for planned
observatories such as eLISA) this background is tiny compared with that from
non-equilibrium sources, the total energy carried by the high-frequency part of
the spectrum is non-negligible if the production continues for a long time. We
suggest that this may constrain (weakly) the highest temperature of the
radiation epoch. Observing the high-frequency part directly sets a very
ambitious goal for future generations of GHz-range detectors.
| [
{
"created": "Fri, 10 Apr 2015 07:22:59 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Jul 2015 09:23:17 GMT",
"version": "v2"
}
] | 2015-08-06 | [
[
"Ghiglieri",
"J.",
""
],
[
"Laine",
"M.",
""
]
] | Because of physical processes ranging from microscopic particle collisions to macroscopic hydrodynamic fluctuations, any plasma in thermal equilibrium emits gravitational waves. For the largest wavelengths the emission rate is proportional to the shear viscosity of the plasma. In the Standard Model at T > 160 GeV, the shear viscosity is dominated by the most weakly interacting particles, right-handed leptons, and is relatively large. We estimate the order of magnitude of the corresponding spectrum of gravitational waves. Even though at small frequencies (corresponding to the sub-Hz range relevant for planned observatories such as eLISA) this background is tiny compared with that from non-equilibrium sources, the total energy carried by the high-frequency part of the spectrum is non-negligible if the production continues for a long time. We suggest that this may constrain (weakly) the highest temperature of the radiation epoch. Observing the high-frequency part directly sets a very ambitious goal for future generations of GHz-range detectors. |
hep-ph/9401311 | Yuval Grossman | Yuval Grossman | Phenomenology of models with more than two Higgs doublets | 28 pages, 8 figures available upon request, LaTeX, WIS-94/3/Jan-PH | Nucl.Phys.B426:355-384,1994 | 10.1016/0550-3213(94)90316-6 | null | hep-ph | null | We study the most general Multi-Higgs-Doublet Model (MHDM) with Natural
Flavor Conservation (NFC). The couplings of a charged scalar $H_i^{\pm}$ to up
quarks, down quarks and charged leptons depend on three new complex parameters,
$X_i$, $Y_i$ and $Z_i$, respectively. We prove relations among these
parameters. We carry out a comprehensive analysis of phenomenological
constraints on the couplings of the lightest charged scalar: $X$, $Y$ and $Z$.
We find that the general MHDM may differ significantly from its minimal
version, the Two-Higgs-Doublet Model (2HDM).
| [
{
"created": "Sun, 23 Jan 1994 07:59:01 GMT",
"version": "v1"
}
] | 2010-11-01 | [
[
"Grossman",
"Yuval",
""
]
] | We study the most general Multi-Higgs-Doublet Model (MHDM) with Natural Flavor Conservation (NFC). The couplings of a charged scalar $H_i^{\pm}$ to up quarks, down quarks and charged leptons depend on three new complex parameters, $X_i$, $Y_i$ and $Z_i$, respectively. We prove relations among these parameters. We carry out a comprehensive analysis of phenomenological constraints on the couplings of the lightest charged scalar: $X$, $Y$ and $Z$. We find that the general MHDM may differ significantly from its minimal version, the Two-Higgs-Doublet Model (2HDM). |
1805.06081 | Chandan Hati | Chandan Hati and Utpal Sarkar | $B-L$ violating nucleon decays as a probe of leptoquarks and
implications for baryogenesis | 24 pages, 4 figures | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the effective $B-L$ violating couplings for scalar and vector
leptoquarks which can naturally induce dimension seven $B-L$ violating
operators leading to very interesting nucleon decay modes such as $n
\rightarrow e^- \pi^+, e^-K^+,\mu^- \pi^+, \mu^-K^+$ and $p \rightarrow \nu
\pi^+$. This opens a new window to probe the nature and couplings of the scalar
and vector leptoquarks in an ultraviolet model independent way which can
provide an orthogonal probe for scalar and vector leptoquark solutions to the
recent anomalous $B$-decay data. Furthermore, we also discuss how these $B-L$
violating interactions can also pave a new way to understand the origin of
matter-antimatter asymmetry of the Universe.
| [
{
"created": "Wed, 16 May 2018 01:08:55 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Jan 2020 13:07:58 GMT",
"version": "v2"
}
] | 2020-01-09 | [
[
"Hati",
"Chandan",
""
],
[
"Sarkar",
"Utpal",
""
]
] | We study the effective $B-L$ violating couplings for scalar and vector leptoquarks which can naturally induce dimension seven $B-L$ violating operators leading to very interesting nucleon decay modes such as $n \rightarrow e^- \pi^+, e^-K^+,\mu^- \pi^+, \mu^-K^+$ and $p \rightarrow \nu \pi^+$. This opens a new window to probe the nature and couplings of the scalar and vector leptoquarks in an ultraviolet model independent way which can provide an orthogonal probe for scalar and vector leptoquark solutions to the recent anomalous $B$-decay data. Furthermore, we also discuss how these $B-L$ violating interactions can also pave a new way to understand the origin of matter-antimatter asymmetry of the Universe. |
2308.07033 | Ipsita Ray | Rusa Mandal, Soumitra Nandi, Ipsita Ray | Constraining inverse moment of $B$-meson distribution amplitude using
Lattice QCD data | version accepted for publication in PLB | null | 10.1016/j.physletb.2023.138345 | null | hep-ph hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We constrain the inverse moment of the $B$-meson light-cone distribution
amplitude (LCDA), $\lambda_B$ in heavy quark effective theory, using form
factor estimates from Lattice QCD collaboration. The estimation of the
parameter $\lambda_B$ has, until now, relied solely on QCD sum rule methods and
deals with significant uncertainty. In this work, we express the form factors
for the $B \to K$ channel, calculated within the light-cone sum rule (LCSR)
approach, in terms of the $B$-meson LCDAs. By incorporating recent Lattice
results from the HPQCD collaboration for the $B \to K$ form factors at zero
momentum transfer ($q^2$ = 0), we impose constraints on this parameter.
Consequently, we achieve a twofold reduction in uncertainty compared to the QCD
sum rule estimate, yielding $\lambda_B=338\pm 68$ MeV, when the $B$-meson LCDAs
are expressed in the Exponential model. Additionally, we compare the form
factor predictions, using the constrained $\lambda_B$ value, with the earlier
analyses for other channels as well, such as $B\to \pi$ and $B \to D$.
| [
{
"created": "Mon, 14 Aug 2023 09:48:45 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Nov 2023 09:05:59 GMT",
"version": "v2"
}
] | 2023-11-27 | [
[
"Mandal",
"Rusa",
""
],
[
"Nandi",
"Soumitra",
""
],
[
"Ray",
"Ipsita",
""
]
] | We constrain the inverse moment of the $B$-meson light-cone distribution amplitude (LCDA), $\lambda_B$ in heavy quark effective theory, using form factor estimates from Lattice QCD collaboration. The estimation of the parameter $\lambda_B$ has, until now, relied solely on QCD sum rule methods and deals with significant uncertainty. In this work, we express the form factors for the $B \to K$ channel, calculated within the light-cone sum rule (LCSR) approach, in terms of the $B$-meson LCDAs. By incorporating recent Lattice results from the HPQCD collaboration for the $B \to K$ form factors at zero momentum transfer ($q^2$ = 0), we impose constraints on this parameter. Consequently, we achieve a twofold reduction in uncertainty compared to the QCD sum rule estimate, yielding $\lambda_B=338\pm 68$ MeV, when the $B$-meson LCDAs are expressed in the Exponential model. Additionally, we compare the form factor predictions, using the constrained $\lambda_B$ value, with the earlier analyses for other channels as well, such as $B\to \pi$ and $B \to D$. |
hep-ph/9410394 | null | S. Catani and F. Hautmann | Surprises from Quarkonium Decay into Photons | 4 pages + 3 figures, uuencoded postscript, Cambridge preprint
Cavendish-HEP-94/09 | Nucl.Phys.Proc.Suppl. 39BC (1995) 359-363 | 10.1016/0920-5632(95)00101-E | null | hep-ph | null | The perturbative QCD approach to quarkonium decay into a photon and hadrons
is reconsidered. It is shown that a consistent treatment within perturbative
QCD calls for the introduction of a fragmentation contribution which has been
neglected so far. The ensuing phenomenological implications are discussed, and,
in particular, the possibility of measuring the gluon fragmentation function of
the photon is addressed.
*To appear in the proceedings of the workshop QCD94, Montpellier, July '94.
| [
{
"created": "Thu, 27 Oct 1994 15:08:54 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Catani",
"S.",
""
],
[
"Hautmann",
"F.",
""
]
] | The perturbative QCD approach to quarkonium decay into a photon and hadrons is reconsidered. It is shown that a consistent treatment within perturbative QCD calls for the introduction of a fragmentation contribution which has been neglected so far. The ensuing phenomenological implications are discussed, and, in particular, the possibility of measuring the gluon fragmentation function of the photon is addressed. *To appear in the proceedings of the workshop QCD94, Montpellier, July '94. |
1207.3126 | Bumseok Kyae | Bumseok Kyae and Jong-Chul Park | Singlet Extension of the MSSM for 125 GeV Higgs Mass with the Least
Tuning | 25 pages, 6 eps figures, published version in Phys. Rev. D | Phys. Rev. D87 (2013) 075021 | 10.1103/PhysRevD.87.075021 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In order to raise the Higgs mass up to 125 GeV and relieve the fine-tuning
associated with the heavy s-top mass in the minimal supersymmetric standard
model (MSSM), we propose a new singlet extension of the MSSM. In this scenario,
the additional Higgs mass is radiatively generated also in a hidden sector, and
the effect is tansmitted to the Higgs through a messenger field. The Higgs mass
can be efficiently increased by the parameters of the superpotential as in the
extra matter scenario, but free from the constraints on extra colored matter
fields by the LHC experiments. As a result, the tuning problem can be
remarkably mitigated by taking low enough messenger mass (\sim 300 GeV) and
mass parameter scales (\sim 500 GeV).
| [
{
"created": "Fri, 13 Jul 2012 01:19:59 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Apr 2013 16:12:14 GMT",
"version": "v2"
}
] | 2013-08-14 | [
[
"Kyae",
"Bumseok",
""
],
[
"Park",
"Jong-Chul",
""
]
] | In order to raise the Higgs mass up to 125 GeV and relieve the fine-tuning associated with the heavy s-top mass in the minimal supersymmetric standard model (MSSM), we propose a new singlet extension of the MSSM. In this scenario, the additional Higgs mass is radiatively generated also in a hidden sector, and the effect is tansmitted to the Higgs through a messenger field. The Higgs mass can be efficiently increased by the parameters of the superpotential as in the extra matter scenario, but free from the constraints on extra colored matter fields by the LHC experiments. As a result, the tuning problem can be remarkably mitigated by taking low enough messenger mass (\sim 300 GeV) and mass parameter scales (\sim 500 GeV). |
2004.08185 | Tolga Altinoluk | Tolga Altinoluk and N\'estor Armesto | Particle correlations from the initial state | 16 pages, 9 figures. Invited review for the EPJA Special Issue on
"Theory of hot matter and relativistic heavy-ion collisions (THOR)". v2:
Summary and discussions modified, references updated. Results and conclusions
unchanged, final version | Eur. Phys. J. A56 (2020) no.8, 215 | 10.1140/epja/s10050-020-00225-6 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The observation in small size collision systems, $pp$ and $p$A, of strong
correlations with long range in rapidity and a characteristic structure in
azimuth, the ridge phenomenon, is one of the most interesting results obtained
at the Large Hadron Collider. Earlier observations of these correlations in
heavy ion collisions at the Relativistic Heavy Ion Collider are standardly
attributed to collective flow due to strong final state interactions, described
in the framework of viscous relativistic hydrodynamics. Even though data for
small size systems are well described in this framework, the applicability of
hydrodynamics is less well grounded and initial state based mechanisms have
been suggested to explain the ridge. In this review, we discuss particle
correlations from the initial state point of view, with focus on the most
recent theoretical developments.
| [
{
"created": "Fri, 17 Apr 2020 11:37:33 GMT",
"version": "v1"
},
{
"created": "Sun, 20 Sep 2020 12:07:51 GMT",
"version": "v2"
}
] | 2020-09-22 | [
[
"Altinoluk",
"Tolga",
""
],
[
"Armesto",
"Néstor",
""
]
] | The observation in small size collision systems, $pp$ and $p$A, of strong correlations with long range in rapidity and a characteristic structure in azimuth, the ridge phenomenon, is one of the most interesting results obtained at the Large Hadron Collider. Earlier observations of these correlations in heavy ion collisions at the Relativistic Heavy Ion Collider are standardly attributed to collective flow due to strong final state interactions, described in the framework of viscous relativistic hydrodynamics. Even though data for small size systems are well described in this framework, the applicability of hydrodynamics is less well grounded and initial state based mechanisms have been suggested to explain the ridge. In this review, we discuss particle correlations from the initial state point of view, with focus on the most recent theoretical developments. |
hep-ph/9810435 | Francesco Vissani | Francesco Vissani (DESY, Hamburg) | Large mixing, family structure, and dominant block in the neutrino mass
matrix | latex, 10 pages, 1 ps fig; - typos, + ref's, + expl's, = results | JHEP 9811:025,1998 | 10.1088/1126-6708/1998/11/025 | DESY 98-164 | hep-ph | null | A possible connection between the flavour structure of the charged fermions
and the large $\nu_\mu-\nu_\tau$ mixing motivates an ansatz for the neutrino
mass matrix with a dominant block. We distinguish between a general form and
the specific forms of the ansatz, and concentrate on the cases of
phenomenological interest. The general form can incorporate an observable
amount of CP violation in the leptonic sector. Only specific forms can
incorporate the Mikheyev-Smirnov-Wolfenstein solutions for solar neutrinos,
with small or large mixing angles. Other specific variants explain the Los
Alamos neutrino anomaly, or provide a two-neutrino hot dark matter component.
| [
{
"created": "Wed, 21 Oct 1998 16:58:58 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Oct 1998 15:32:04 GMT",
"version": "v2"
}
] | 2010-02-03 | [
[
"Vissani",
"Francesco",
"",
"DESY, Hamburg"
]
] | A possible connection between the flavour structure of the charged fermions and the large $\nu_\mu-\nu_\tau$ mixing motivates an ansatz for the neutrino mass matrix with a dominant block. We distinguish between a general form and the specific forms of the ansatz, and concentrate on the cases of phenomenological interest. The general form can incorporate an observable amount of CP violation in the leptonic sector. Only specific forms can incorporate the Mikheyev-Smirnov-Wolfenstein solutions for solar neutrinos, with small or large mixing angles. Other specific variants explain the Los Alamos neutrino anomaly, or provide a two-neutrino hot dark matter component. |
hep-ph/9303205 | Ivan | Eric Braaten and Tzu Chiang Yuan | Gluon Fragmentation into Heavy Quarkonium | LateX 11 pages (3 figures available upon request). NUHEP-TH-92-23 | Phys.Rev.Lett.71:1673-1676,1993 | 10.1103/PhysRevLett.71.1673 | null | hep-ph | null | The dominant production mechanism for heavy quark-antiquark bound states in
very high energy processes is fragmentation, the splitting of a high energy
parton into a quarkonium state and other partons. We show that the
fragmentation functions $D(z,\mu)$ describing these processes can be calculated
using perturbative QCD. We calculate the fragmentation functions for a gluon to
split into S-wave quarkonium states to leading order in the QCD coupling
constant. The leading logarithms of $\mu/m_Q$, where $\mu$ is the factorization
scale and $m_Q$ is the heavy quark mass, are summed up using Altarelli-Parisi
evolution equations.
| [
{
"created": "Tue, 2 Mar 1993 16:26:46 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Braaten",
"Eric",
""
],
[
"Yuan",
"Tzu Chiang",
""
]
] | The dominant production mechanism for heavy quark-antiquark bound states in very high energy processes is fragmentation, the splitting of a high energy parton into a quarkonium state and other partons. We show that the fragmentation functions $D(z,\mu)$ describing these processes can be calculated using perturbative QCD. We calculate the fragmentation functions for a gluon to split into S-wave quarkonium states to leading order in the QCD coupling constant. The leading logarithms of $\mu/m_Q$, where $\mu$ is the factorization scale and $m_Q$ is the heavy quark mass, are summed up using Altarelli-Parisi evolution equations. |
hep-ph/0101332 | Xuan-Yem Pham | Van Hieu Nguyen, Xuan-Yem Pham | Gluon-Photon mixing in dense QCD | LaTeX, 8 pages + 1 postscript figure | Phys.Rev. D64 (2001) 074009 | null | PAR-LPTHE 01-03 | hep-ph | null | At high baryonic density with the formation of a diquark condensate $\Delta
\neq 0$, the QCD color symmetry is spontaneously broken.
Being massive by the Anderson-Higgs mechanism, gluon and photon should mix
together within two linear combinations due to the color non-conservation.
Consequently a gluon $\widetilde{G}$ could decay into an $e^- e^+$ pair via its
photon component. With a low invariant mass (about a few ten MeV) and an
extremely narrow width peaking above the continuum background, the purely
leptonic decay of a strongly-interacting gluon $\widetilde{G} \to e^- + e^+$
constitutes a very distinctive signature of the color superconductivity phase.
By a similar scenario of gluon-$Z$ mixing, another "missing-energy" decay into
invisible neutrinos $\widetilde{G} \to \nu +\bar{\nu}$ could arise, its
amplitude is however $(\Delta/M_Z)^2$ power-suppressed.
| [
{
"created": "Tue, 30 Jan 2001 10:29:31 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Feb 2001 09:23:34 GMT",
"version": "v2"
},
{
"created": "Tue, 6 Feb 2001 12:47:36 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Nguyen",
"Van Hieu",
""
],
[
"Pham",
"Xuan-Yem",
""
]
] | At high baryonic density with the formation of a diquark condensate $\Delta \neq 0$, the QCD color symmetry is spontaneously broken. Being massive by the Anderson-Higgs mechanism, gluon and photon should mix together within two linear combinations due to the color non-conservation. Consequently a gluon $\widetilde{G}$ could decay into an $e^- e^+$ pair via its photon component. With a low invariant mass (about a few ten MeV) and an extremely narrow width peaking above the continuum background, the purely leptonic decay of a strongly-interacting gluon $\widetilde{G} \to e^- + e^+$ constitutes a very distinctive signature of the color superconductivity phase. By a similar scenario of gluon-$Z$ mixing, another "missing-energy" decay into invisible neutrinos $\widetilde{G} \to \nu +\bar{\nu}$ could arise, its amplitude is however $(\Delta/M_Z)^2$ power-suppressed. |
hep-ph/0202223 | Xiao-Gang He | Xiao-Gang He (NTU) | Strong, Electroweak Interactions and Their Unification with
Noncommutative Space-time | 12 pages, Revtex, no figures. Version to be published in ERJC | Eur.Phys.J.C28:557-560,2003 | 10.1140/epjc/s2003-01185-5 | null | hep-ph hep-th | null | Quantum field theories based on noncommutative space-time (NCQFT) have been
extensively studied recently. However no NCQFT model, which can uniquely
describe the strong and electroweak interactions, has been constructed. This
prevents consistent and systematic study of noncommutative space-time. In this
work we construct a NCQFT model based on the trinification gauge group
$SU(3)_C\times SU(3)_L\times SU(3)_R$. A unique feature of this model, that all
matter fields (fermions and Higgses) are assigned to (anti-)fundamental
representations of the factor SU(3) groups, allows us to construct a NCQFT
model for strong and electroweak interactions and their unification without
ambiguities. This model provides an example which allows consistent and
systematic study of noncommutative space-time phenomenology. We also comment on
some related issues regarding extensions to $E_6$ and $U(3)_C\times
U(3)_L\times U(3)_R$ models.
| [
{
"created": "Sun, 24 Feb 2002 05:07:29 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Aug 2002 06:32:47 GMT",
"version": "v2"
},
{
"created": "Thu, 3 Apr 2003 20:23:18 GMT",
"version": "v3"
}
] | 2011-09-13 | [
[
"He",
"Xiao-Gang",
"",
"NTU"
]
] | Quantum field theories based on noncommutative space-time (NCQFT) have been extensively studied recently. However no NCQFT model, which can uniquely describe the strong and electroweak interactions, has been constructed. This prevents consistent and systematic study of noncommutative space-time. In this work we construct a NCQFT model based on the trinification gauge group $SU(3)_C\times SU(3)_L\times SU(3)_R$. A unique feature of this model, that all matter fields (fermions and Higgses) are assigned to (anti-)fundamental representations of the factor SU(3) groups, allows us to construct a NCQFT model for strong and electroweak interactions and their unification without ambiguities. This model provides an example which allows consistent and systematic study of noncommutative space-time phenomenology. We also comment on some related issues regarding extensions to $E_6$ and $U(3)_C\times U(3)_L\times U(3)_R$ models. |
0710.5117 | Sabine Kraml | S. Kraml | CP violation in SUSY | Submitted for the SUSY07 proceedings, 8 pages | null | null | null | hep-ph | null | CP violation in supersymmetric models is reviewd with focus on explicit CP
violation in the MSSM. The topics covered in particular are CP-mixing in the
Higgs sector and its measurement at the LHC, CP-odd observables in the gaugino
sector at the ILC, EDM constraints, and the neutralino relic density.
| [
{
"created": "Fri, 26 Oct 2007 15:22:43 GMT",
"version": "v1"
}
] | 2007-10-29 | [
[
"Kraml",
"S.",
""
]
] | CP violation in supersymmetric models is reviewd with focus on explicit CP violation in the MSSM. The topics covered in particular are CP-mixing in the Higgs sector and its measurement at the LHC, CP-odd observables in the gaugino sector at the ILC, EDM constraints, and the neutralino relic density. |
hep-ph/0112356 | Wu Xiao-hong | Chao-Shang Huang and Xiao-Hong Wu (ITP, Chinese Academy of Sciences) | Damped $\sin(\beta-\alpha)$ of Higgs couplings and the lightest Higgs
production at $\gamma\gamma$ colliders in MSSM | 19 pages, 12 figures and 1 table | Phys.Rev. D66 (2002) 075002 | 10.1103/PhysRevD.66.075002 | null | hep-ph | null | In the decoupling limit, $M^2_{A^0} \gg M^2_Z$, the heavy CP-even, CP-odd and
charged Higgs boson masses are nearly degenerate, $\sin(\beta-\alpha)$
approaches 1, and the lightest CP-even Higgs boson almost displays the same
properties as the Standard Model Higgs boson. But the stop and sbottom sector
can change this pattern through radiative corrections. We find that there are
parameter regions at small, moderate and large $\tan\beta$ in MSSM under
experimental constraints of $(g-2)_{\mu}$ and $b\to s\gamma$, where
$\sin^2(\beta-\alpha)$ is damped (say below 0.8), which has a significant
effect on Higgs couplings $g_{h^0VV} (V=W^\pm,Z^0)$ and $g_{h^0\gamma\gamma}$.
We discuss its impact on the lightest CP-even Higgs production at
$\gamma\gamma$ colliders.
| [
{
"created": "Sat, 29 Dec 2001 04:42:17 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Huang",
"Chao-Shang",
"",
"ITP, Chinese Academy of Sciences"
],
[
"Wu",
"Xiao-Hong",
"",
"ITP, Chinese Academy of Sciences"
]
] | In the decoupling limit, $M^2_{A^0} \gg M^2_Z$, the heavy CP-even, CP-odd and charged Higgs boson masses are nearly degenerate, $\sin(\beta-\alpha)$ approaches 1, and the lightest CP-even Higgs boson almost displays the same properties as the Standard Model Higgs boson. But the stop and sbottom sector can change this pattern through radiative corrections. We find that there are parameter regions at small, moderate and large $\tan\beta$ in MSSM under experimental constraints of $(g-2)_{\mu}$ and $b\to s\gamma$, where $\sin^2(\beta-\alpha)$ is damped (say below 0.8), which has a significant effect on Higgs couplings $g_{h^0VV} (V=W^\pm,Z^0)$ and $g_{h^0\gamma\gamma}$. We discuss its impact on the lightest CP-even Higgs production at $\gamma\gamma$ colliders. |
1612.08159 | Qinrong Gong | Qin-Rong Gong, Jing-Long Pang, Yu-Fei Wang, and Han-Qing Zheng | The $Z_c(3900)$ peak does not come from the "triangle singularity" | null | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compare contributions from the triangle diagram and the $D\bar D^*$ bubble
chain to the processes of $e^{+}e^{-}\rightarrow J/\psi\pi^{+}\pi^{-}$ and
$e^{+}e^{-}\rightarrow (D\bar D^*)^\mp\pi^{\pm}$. By fitting the $J/\psi\pi$
maximum spectrum and the $D\bar D^*$ spectrum, we find that the triangle
diagram cannot explain the new data from BESIII Collaboration at center of mass
at 4.23GeV and 4.26GeV, simultaneously. On the contrary, the molecular
assignment of $Z_c(3900)$ gives a much better description.
| [
{
"created": "Sat, 24 Dec 2016 10:02:52 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Apr 2017 10:23:50 GMT",
"version": "v2"
},
{
"created": "Sun, 6 Aug 2017 10:21:57 GMT",
"version": "v3"
}
] | 2017-08-08 | [
[
"Gong",
"Qin-Rong",
""
],
[
"Pang",
"Jing-Long",
""
],
[
"Wang",
"Yu-Fei",
""
],
[
"Zheng",
"Han-Qing",
""
]
] | We compare contributions from the triangle diagram and the $D\bar D^*$ bubble chain to the processes of $e^{+}e^{-}\rightarrow J/\psi\pi^{+}\pi^{-}$ and $e^{+}e^{-}\rightarrow (D\bar D^*)^\mp\pi^{\pm}$. By fitting the $J/\psi\pi$ maximum spectrum and the $D\bar D^*$ spectrum, we find that the triangle diagram cannot explain the new data from BESIII Collaboration at center of mass at 4.23GeV and 4.26GeV, simultaneously. On the contrary, the molecular assignment of $Z_c(3900)$ gives a much better description. |
1407.2749 | Valentina Sadovnikova | E. G. Drukarev, V. A. Sadovnikova | Nucleon QCD sum rules in instanton vacuum | 23 pages, 7 figures. arXiv admin note: text overlap with
arXiv:1312.1449 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the polarization operator of the nucleon current in the
instanton medium. The medium (QCD vacuum) is assumed to be a composition of the
instantons of large and small sizes. The former are described in terms of the
local scalar condensate, while the latter can be interpreted as the nonlocal
scalar condensate. We solve the corresponding QCD sum rules equations and
demonstrate that there is a solution with the value of the nucleon mass close
to the physical one if the fraction of the small size instantons w_s \approx
2/3.
| [
{
"created": "Thu, 10 Jul 2014 10:47:57 GMT",
"version": "v1"
}
] | 2014-07-11 | [
[
"Drukarev",
"E. G.",
""
],
[
"Sadovnikova",
"V. A.",
""
]
] | We calculate the polarization operator of the nucleon current in the instanton medium. The medium (QCD vacuum) is assumed to be a composition of the instantons of large and small sizes. The former are described in terms of the local scalar condensate, while the latter can be interpreted as the nonlocal scalar condensate. We solve the corresponding QCD sum rules equations and demonstrate that there is a solution with the value of the nucleon mass close to the physical one if the fraction of the small size instantons w_s \approx 2/3. |
1409.2145 | Mohammad Athar SAJJAD | M. Rafi Alam, M. Sajjad Athar, S. Chauhan and S. K. Singh | Quasielastic hyperon production in $\bar\nu_\mu-$Nucleus interactions | Published in J.Phys. G42 (2015) 5, 055107 | J.Phys. G42 (2015) 5, 055107 | 10.1088/0954-3899/42/5/055107 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have studied quasielastic charged current hyperon production induced by
$\bar\nu_\mu$ on free nucleon and the nucleons bound inside the nucleus.
The calculations are performed for several nuclear targets like $^{12}C$,
$^{40}Ar$, $^{56}Fe$ and $^{208}Pb$ which are presently being used in various
oscillation experiments using accelerator neutrinos. The inputs are the
hyperon-nucleon transition form factors determined from neutrino-nucleon
scattering as well as from semileptonic decays of neutron and hyperons using
SU(3) symmetry. The calculations for the nuclear targets are done in local
density approximation. The nuclear medium effects(NME) due to Fermi motion and
final state interaction(FSI) effect due to hyperon-nucleon scattering have been
taken into account.
| [
{
"created": "Sun, 7 Sep 2014 17:54:52 GMT",
"version": "v1"
},
{
"created": "Sun, 8 Feb 2015 05:59:32 GMT",
"version": "v2"
},
{
"created": "Thu, 1 Oct 2015 07:52:47 GMT",
"version": "v3"
}
] | 2015-10-02 | [
[
"Alam",
"M. Rafi",
""
],
[
"Athar",
"M. Sajjad",
""
],
[
"Chauhan",
"S.",
""
],
[
"Singh",
"S. K.",
""
]
] | We have studied quasielastic charged current hyperon production induced by $\bar\nu_\mu$ on free nucleon and the nucleons bound inside the nucleus. The calculations are performed for several nuclear targets like $^{12}C$, $^{40}Ar$, $^{56}Fe$ and $^{208}Pb$ which are presently being used in various oscillation experiments using accelerator neutrinos. The inputs are the hyperon-nucleon transition form factors determined from neutrino-nucleon scattering as well as from semileptonic decays of neutron and hyperons using SU(3) symmetry. The calculations for the nuclear targets are done in local density approximation. The nuclear medium effects(NME) due to Fermi motion and final state interaction(FSI) effect due to hyperon-nucleon scattering have been taken into account. |
hep-ph/0001253 | Robert Fleischer | Robert Fleischer (DESY Hamburg) | Constraining Penguin Contributions and the CKM Angle $\gamma$ through
$B_d\to\pi^+\pi^-$ | 16 pages, LaTeX, 4 figures | Eur.Phys.J.C16:87-95,2000 | 10.1007/s100520050005 | DESY 00-014 | hep-ph | null | The decays $B_d\to\pi^+\pi^-$ and $B_s\to K^+K^-$ provide an interesting
strategy to extract the CKM angle $\gamma$ at ``second-generation'' $B$-physics
experiments of the LHC era. A variant for ``first-generation'' experiments can
be obtained, if $B_s\to K^+K^-$ is replaced by $B_d\to\pi^\mp K^\pm$. We show
that the most recent experimental results for the CP-averaged
$B_d\to\pi^+\pi^-$ and $B_d\to\pi^\mp K^\pm$ branching ratios imply a rather
restricted range for the corresponding penguin parameters, and upper bounds on
the direct CP asymmetries $A_{CP}^{dir}(B_d\to\pi^+\pi^-)$ and
$A_{CP}^{dir}(B_d\to\pi^\mp K^\pm)$. Moreover, we point out that interesting
constraints on $\gamma$ can be obtained from the CP-averaged $B_d\to\pi^+\pi^-$
and $B_d\to\pi^\mp K^\pm$ branching ratios, if in addition mixing-induced CP
violation in the former decay is measured, and the $B^0_d$--$\bar{B^0_d}$
mixing phase is fixed through $B_d\to J/\psi K_S$. An extraction of $\gamma$
becomes possible, if furthermore direct CP violation in $B_d\to\pi^+\pi^-$ or
$B_d\to\pi^\mp K^\pm$ is observed.
| [
{
"created": "Tue, 25 Jan 2000 10:24:44 GMT",
"version": "v1"
}
] | 2010-11-23 | [
[
"Fleischer",
"Robert",
"",
"DESY Hamburg"
]
] | The decays $B_d\to\pi^+\pi^-$ and $B_s\to K^+K^-$ provide an interesting strategy to extract the CKM angle $\gamma$ at ``second-generation'' $B$-physics experiments of the LHC era. A variant for ``first-generation'' experiments can be obtained, if $B_s\to K^+K^-$ is replaced by $B_d\to\pi^\mp K^\pm$. We show that the most recent experimental results for the CP-averaged $B_d\to\pi^+\pi^-$ and $B_d\to\pi^\mp K^\pm$ branching ratios imply a rather restricted range for the corresponding penguin parameters, and upper bounds on the direct CP asymmetries $A_{CP}^{dir}(B_d\to\pi^+\pi^-)$ and $A_{CP}^{dir}(B_d\to\pi^\mp K^\pm)$. Moreover, we point out that interesting constraints on $\gamma$ can be obtained from the CP-averaged $B_d\to\pi^+\pi^-$ and $B_d\to\pi^\mp K^\pm$ branching ratios, if in addition mixing-induced CP violation in the former decay is measured, and the $B^0_d$--$\bar{B^0_d}$ mixing phase is fixed through $B_d\to J/\psi K_S$. An extraction of $\gamma$ becomes possible, if furthermore direct CP violation in $B_d\to\pi^+\pi^-$ or $B_d\to\pi^\mp K^\pm$ is observed. |
1907.09235 | Chengcheng Han | Chengcheng Han | Higgsino Dark Matter in a Non-Standard History of the Universe | 14 pages, 3 figures, version to appear in PLB | null | 10.1016/j.physletb.2019.134997 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A light higgsino is strongly favored by the naturalness, while as a dark
matter candidate it is usually under-abundant. We consider the higgsino
production in a non-standard history of the universe, caused by a scalar field
with an initially displaced vacuum. We find that given a proper reheating
temperature induced by the scalar decay, a light higgsino could provide the
correct dark matter relic abundance. On the other hand, a sub-TeV higgsino dark
matter, once observed, would be a strong hint of the non-standard thermal
history of the universe.
| [
{
"created": "Mon, 22 Jul 2019 11:14:20 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Aug 2019 08:52:40 GMT",
"version": "v2"
},
{
"created": "Wed, 2 Oct 2019 06:32:45 GMT",
"version": "v3"
}
] | 2019-10-09 | [
[
"Han",
"Chengcheng",
""
]
] | A light higgsino is strongly favored by the naturalness, while as a dark matter candidate it is usually under-abundant. We consider the higgsino production in a non-standard history of the universe, caused by a scalar field with an initially displaced vacuum. We find that given a proper reheating temperature induced by the scalar decay, a light higgsino could provide the correct dark matter relic abundance. On the other hand, a sub-TeV higgsino dark matter, once observed, would be a strong hint of the non-standard thermal history of the universe. |
1809.01153 | Tom\'a\v{s} Husek | Tom\'a\v{s} Husek, Evgueni Goudzovski, Karol Kampf | Precise determination of the branching ratio of the neutral-pion Dalitz
decay | 6 pages, 1 figure, 3 tables; v3: version accepted by PRL, major text
improvements, figure and references added; v2: minor changes, references
updated | Phys. Rev. Lett. 122, 022003 (2019) | 10.1103/PhysRevLett.122.022003 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We provide a new value for the ratio $R={\Gamma(\pi^0\to
e^+e^-\gamma(\gamma))}/{\Gamma(\pi^0\to\gamma\gamma)}=11.978(6)\times10^{-3}$,
which is by two orders of magnitude more precise than the current Particle Data
Group average. It is obtained using the complete set of the
next-to-leading-order radiative corrections in the QED sector, and incorporates
up-to-date values of the $\pi^0$-transition-form-factor slope. The ratio $R$
translates into the branching ratios of the two main $\pi^0$ decay modes:
$\mathcal{B}(\pi^0\to\gamma\gamma)=98.8131(6)\,\%$ and $\mathcal{B}(\pi^0\to
e^+e^-\gamma(\gamma))=1.1836(6)\,\%$.
| [
{
"created": "Tue, 4 Sep 2018 18:00:02 GMT",
"version": "v1"
},
{
"created": "Tue, 18 Sep 2018 22:58:39 GMT",
"version": "v2"
},
{
"created": "Mon, 7 Jan 2019 16:24:22 GMT",
"version": "v3"
}
] | 2019-01-23 | [
[
"Husek",
"Tomáš",
""
],
[
"Goudzovski",
"Evgueni",
""
],
[
"Kampf",
"Karol",
""
]
] | We provide a new value for the ratio $R={\Gamma(\pi^0\to e^+e^-\gamma(\gamma))}/{\Gamma(\pi^0\to\gamma\gamma)}=11.978(6)\times10^{-3}$, which is by two orders of magnitude more precise than the current Particle Data Group average. It is obtained using the complete set of the next-to-leading-order radiative corrections in the QED sector, and incorporates up-to-date values of the $\pi^0$-transition-form-factor slope. The ratio $R$ translates into the branching ratios of the two main $\pi^0$ decay modes: $\mathcal{B}(\pi^0\to\gamma\gamma)=98.8131(6)\,\%$ and $\mathcal{B}(\pi^0\to e^+e^-\gamma(\gamma))=1.1836(6)\,\%$. |
0801.4249 | Vincent Mathieu | Vincent Mathieu | Introduction to the Pinch Technique | 45 pages, lectures given at the Third Modave Summer School in
Mathematical Physics, September 2007. References added | null | null | null | hep-ph | null | These notes are a short introduction to the pinch technique. We present the
one-loop calculations for basic QCD Green's functions. The equivalence between
the pinch technique and the background field method is explicitly shown at the
one-loop level. We review the absorptive pinch technique in the last sections.
These lectures are a compilation of relevant papers on this subject and are
prepared for the third Modave Summer School in Mathematical Physics.
| [
{
"created": "Mon, 28 Jan 2008 11:43:11 GMT",
"version": "v1"
},
{
"created": "Fri, 1 Feb 2008 14:13:26 GMT",
"version": "v2"
}
] | 2008-02-01 | [
[
"Mathieu",
"Vincent",
""
]
] | These notes are a short introduction to the pinch technique. We present the one-loop calculations for basic QCD Green's functions. The equivalence between the pinch technique and the background field method is explicitly shown at the one-loop level. We review the absorptive pinch technique in the last sections. These lectures are a compilation of relevant papers on this subject and are prepared for the third Modave Summer School in Mathematical Physics. |
hep-ph/9612350 | Luis Bettencourt | Luis M. A. Bettencourt, Pablo Laguna, Richard A. Matzner | Non-intercommuting Cosmic Strings | Reference to URL with Animations corrected. To appear in Physical
Review Letters. 4 pages, 2 figures, RevTeX, available through anonymous ftp
from ftp://euclid.tp.ph.ic.ac.uk/papers or on WWW at
http://euclid.tp.ph.ic.ac.uk/Papers | Phys.Rev.Lett. 78 (1997) 2066-2069 | 10.1103/PhysRevLett.78.2066 | IMPERIAL/TP/95-96/64,HD-THEP-96-49,CGPG-96/12-2 | hep-ph astro-ph gr-qc | null | We perform the numerical field evolution for the collision of two Abelian
type I cosmic strings. We present evidence that, for collisions at small but
characteristic relative velocities and angles, these cosmic strings do not
exchange ends and separate. Rather, local higher winding number bound states
are formed close to the collision point, which promote multiple local
scatterings at right angles and prevent intercommutation from happening. This
constitutes the simplest example of the breakdown of the intercommutation rule,
usually assumed in the construction of effective models for cosmic string
network evolution.
| [
{
"created": "Fri, 13 Dec 1996 17:39:28 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Feb 1997 12:54:18 GMT",
"version": "v2"
},
{
"created": "Mon, 17 Feb 1997 10:59:17 GMT",
"version": "v3"
}
] | 2009-10-30 | [
[
"Bettencourt",
"Luis M. A.",
""
],
[
"Laguna",
"Pablo",
""
],
[
"Matzner",
"Richard A.",
""
]
] | We perform the numerical field evolution for the collision of two Abelian type I cosmic strings. We present evidence that, for collisions at small but characteristic relative velocities and angles, these cosmic strings do not exchange ends and separate. Rather, local higher winding number bound states are formed close to the collision point, which promote multiple local scatterings at right angles and prevent intercommutation from happening. This constitutes the simplest example of the breakdown of the intercommutation rule, usually assumed in the construction of effective models for cosmic string network evolution. |
1003.2385 | James Barry | James Barry, Werner Rodejohann | Deviations from tribimaximal mixing due to the vacuum expectation value
misalignment in A_4 models | 25 pages, 11 figures, published in Phys. Rev. D | Phys.Rev.D81:093002,2010; Erratum-ibid.D81:119901,2010 | 10.1103/PhysRevD.81.093002 10.1103/PhysRevD.81.119901 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The addition of an A_4 family symmetry and extended Higgs sector to the
Standard Model can generate the tribimaximal mixing pattern for leptons,
assuming the correct vacuum expectation value alignment of the Higgs scalars.
Deviating this alignment affects the predictions for the neutrino oscillation
and neutrino mass observables. An attempt is made to classify the plethora of
models in the literature, with respect to the chosen A_4 particle assignments.
Of these models, two particularly popular examples have been analyzed for
deviations from tribimaximal mixing by perturbing the vacuum expectation value
alignments. The effect of perturbations on the mixing angle observables is
studied. However, it is only investigation of the mass-related observables (the
effective mass for neutrinoless double beta decay and the sum of masses from
cosmology) that can lead to the exclusion of particular models by constraints
from future data, which indicates the importance of neutrino mass in
disentangling models. The models have also been tested for fine-tuning of the
parameters. Furthermore, a well-known seesaw model is generalized to include
additional scalars, which transform as representations of A_4 not included in
the original model.
| [
{
"created": "Thu, 11 Mar 2010 18:26:12 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Apr 2010 12:45:14 GMT",
"version": "v2"
},
{
"created": "Thu, 10 Jun 2010 09:51:31 GMT",
"version": "v3"
}
] | 2014-11-20 | [
[
"Barry",
"James",
""
],
[
"Rodejohann",
"Werner",
""
]
] | The addition of an A_4 family symmetry and extended Higgs sector to the Standard Model can generate the tribimaximal mixing pattern for leptons, assuming the correct vacuum expectation value alignment of the Higgs scalars. Deviating this alignment affects the predictions for the neutrino oscillation and neutrino mass observables. An attempt is made to classify the plethora of models in the literature, with respect to the chosen A_4 particle assignments. Of these models, two particularly popular examples have been analyzed for deviations from tribimaximal mixing by perturbing the vacuum expectation value alignments. The effect of perturbations on the mixing angle observables is studied. However, it is only investigation of the mass-related observables (the effective mass for neutrinoless double beta decay and the sum of masses from cosmology) that can lead to the exclusion of particular models by constraints from future data, which indicates the importance of neutrino mass in disentangling models. The models have also been tested for fine-tuning of the parameters. Furthermore, a well-known seesaw model is generalized to include additional scalars, which transform as representations of A_4 not included in the original model. |
hep-ph/0003238 | Patricia Ball | P. Ball, R. Fleischer, G.F. Tartarelli, P. Vikas, G. Wilkinson, J.
Baines, S.P. Baranov, P. Bartalini, M. Beneke, E. Bouhova, G. Buchalla, I.
Caprini, F. Charles, J. Charles, Y. Coadou, P. Colangelo, P. Colrain, J.
Damet, F. De Fazio, A. Dighe, H. Dijkstra, P. Eerola, N. Ellis, B. Epp, S.
Gadomski, P. Galumian, I. Gavrilenko, S. George, V.M. Ghete, V. Gibson, L.
Guy, Y. Hasegawa, P. Iengo, A. Jacholkowska, R. Jones, A. Khodjamirian, E.
Kneringer, P. Koppenburg, H. Korsmo, N. Labanca, L. Lellouch, M. Lehto, Y.
Lemoigne, J. Libby, J. Matias, S. Mele, M. Misiak, A.M. Nairz, T. Nakada, A.
Nikitenko, N. Nikitin, A. Nisati, F. Palla, E. Polycarpo, J. Rademacker, F.
Rizatdinova, S. Robins, D. Rousseau, W. Ruckstuhl, M.A. Sanchis, O.
Schneider, M. Shapiro, C. Shepherd-Themistocleous, P. Sherwood, L. Smirnova,
M. Smizanska, A. Starodumov, N. Stepanov, Z. Xie, N. Zaitsev | B decays at the LHC | 112 pages, ca.90 partially bitmapped PS figures, PS with high
resolution figures available from http://home.cern.ch/~pball/master.ps.gz, P.
Ball, R. Fleischer, G.F. Tartarelli, P. Vikas, G. Wilkinson (convenors) | null | null | CERN-TH/2000-101 | hep-ph hep-ex | null | We review the prospects for B decay studies at the LHC.
| [
{
"created": "Thu, 23 Mar 2000 23:55:13 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Mar 2000 16:12:42 GMT",
"version": "v2"
},
{
"created": "Sat, 25 Mar 2000 08:52:50 GMT",
"version": "v3"
}
] | 2009-09-25 | [
[
"Ball",
"P.",
""
],
[
"Fleischer",
"R.",
""
],
[
"Tartarelli",
"G. F.",
""
],
[
"Vikas",
"P.",
""
],
[
"Wilkinson",
"G.",
""
],
[
"Baines",
"J.",
""
],
[
"Baranov",
"S. P.",
""
],
[
"Bartalini",
"P.",
""
],
[
"Beneke",
"M.",
""
],
[
"Bouhova",
"E.",
""
],
[
"Buchalla",
"G.",
""
],
[
"Caprini",
"I.",
""
],
[
"Charles",
"F.",
""
],
[
"Charles",
"J.",
""
],
[
"Coadou",
"Y.",
""
],
[
"Colangelo",
"P.",
""
],
[
"Colrain",
"P.",
""
],
[
"Damet",
"J.",
""
],
[
"De Fazio",
"F.",
""
],
[
"Dighe",
"A.",
""
],
[
"Dijkstra",
"H.",
""
],
[
"Eerola",
"P.",
""
],
[
"Ellis",
"N.",
""
],
[
"Epp",
"B.",
""
],
[
"Gadomski",
"S.",
""
],
[
"Galumian",
"P.",
""
],
[
"Gavrilenko",
"I.",
""
],
[
"George",
"S.",
""
],
[
"Ghete",
"V. M.",
""
],
[
"Gibson",
"V.",
""
],
[
"Guy",
"L.",
""
],
[
"Hasegawa",
"Y.",
""
],
[
"Iengo",
"P.",
""
],
[
"Jacholkowska",
"A.",
""
],
[
"Jones",
"R.",
""
],
[
"Khodjamirian",
"A.",
""
],
[
"Kneringer",
"E.",
""
],
[
"Koppenburg",
"P.",
""
],
[
"Korsmo",
"H.",
""
],
[
"Labanca",
"N.",
""
],
[
"Lellouch",
"L.",
""
],
[
"Lehto",
"M.",
""
],
[
"Lemoigne",
"Y.",
""
],
[
"Libby",
"J.",
""
],
[
"Matias",
"J.",
""
],
[
"Mele",
"S.",
""
],
[
"Misiak",
"M.",
""
],
[
"Nairz",
"A. M.",
""
],
[
"Nakada",
"T.",
""
],
[
"Nikitenko",
"A.",
""
],
[
"Nikitin",
"N.",
""
],
[
"Nisati",
"A.",
""
],
[
"Palla",
"F.",
""
],
[
"Polycarpo",
"E.",
""
],
[
"Rademacker",
"J.",
""
],
[
"Rizatdinova",
"F.",
""
],
[
"Robins",
"S.",
""
],
[
"Rousseau",
"D.",
""
],
[
"Ruckstuhl",
"W.",
""
],
[
"Sanchis",
"M. A.",
""
],
[
"Schneider",
"O.",
""
],
[
"Shapiro",
"M.",
""
],
[
"Shepherd-Themistocleous",
"C.",
""
],
[
"Sherwood",
"P.",
""
],
[
"Smirnova",
"L.",
""
],
[
"Smizanska",
"M.",
""
],
[
"Starodumov",
"A.",
""
],
[
"Stepanov",
"N.",
""
],
[
"Xie",
"Z.",
""
],
[
"Zaitsev",
"N.",
""
]
] | We review the prospects for B decay studies at the LHC. |
hep-ph/9910459 | Alan R. White | Alan R. White | The Triple-Regge Triangle Anomaly | 10 pages, with 6 ps figures in the text | null | null | ANL-HEP-PR-99-108 | hep-ph hep-th | null | It is shown that the triangle anomaly is present, as an infra-red divergence,
in the six-reggeon triple-regge interaction vertex obtained from a maximally
non-planar Feynman diagram in the full triple-regge limit of three-to-three
quark scattering. A multi-regge asymptotic dispersion relation formalism can be
used to isolate all anomaly contributions and to discuss when and how there is
a cancelation.
| [
{
"created": "Sat, 23 Oct 1999 15:06:21 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Apr 2000 19:47:10 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"White",
"Alan R.",
""
]
] | It is shown that the triangle anomaly is present, as an infra-red divergence, in the six-reggeon triple-regge interaction vertex obtained from a maximally non-planar Feynman diagram in the full triple-regge limit of three-to-three quark scattering. A multi-regge asymptotic dispersion relation formalism can be used to isolate all anomaly contributions and to discuss when and how there is a cancelation. |
1103.5057 | Peter Levai | A. Pasztor, P. Levai, Z. Trocsanyi | Contributions from weak-interaction channels to inclusive hadron spectra
at TeV energies | 4 pages, 5 figures | null | null | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | At the FERMILAB TEVATRON and CERN LHC accelerators partonic processes reach
such a high energy region, where the weak interactions could enter into
consideration in the hadron yields through the opening of resonant W and Z
exchange diagrams. We investigate these contributions to inclusive charged
hadron production in p+p and p+{\bar p} reactions at a few TeV energies, and
compare our results to existing CDF and CMS data. We perform a leading order
perturbative QCD calculation and include electroweak channels to estimate the
order of magnitude of charged hadron excess. The energy dependence of hadron
production and the fine structure of transverse momentum distributions are
investigated. As expected, in p+ {\bar p} collisions electroweak channels yield
much larger contribution, than in p+p collisions. However, these types of
contributions remains close to be negligible at the available accelerator
energies.
| [
{
"created": "Fri, 25 Mar 2011 18:37:09 GMT",
"version": "v1"
}
] | 2011-03-28 | [
[
"Pasztor",
"A.",
""
],
[
"Levai",
"P.",
""
],
[
"Trocsanyi",
"Z.",
""
]
] | At the FERMILAB TEVATRON and CERN LHC accelerators partonic processes reach such a high energy region, where the weak interactions could enter into consideration in the hadron yields through the opening of resonant W and Z exchange diagrams. We investigate these contributions to inclusive charged hadron production in p+p and p+{\bar p} reactions at a few TeV energies, and compare our results to existing CDF and CMS data. We perform a leading order perturbative QCD calculation and include electroweak channels to estimate the order of magnitude of charged hadron excess. The energy dependence of hadron production and the fine structure of transverse momentum distributions are investigated. As expected, in p+ {\bar p} collisions electroweak channels yield much larger contribution, than in p+p collisions. However, these types of contributions remains close to be negligible at the available accelerator energies. |
hep-ph/0302117 | Stefan Scherer | T. Fuchs, J. Gegelia, G. Japaridze, and S. Scherer | Renormalization of relativistic baryon chiral perturbation theory and
power counting | 20 pages, RevTex, 1 figure, published version is shortened | Phys.Rev.D68:056005,2003 | 10.1103/PhysRevD.68.056005 | MKPH-T-03-2 | hep-ph nucl-th | null | We discuss a renormalization scheme for relativistic baryon chiral
perturbation theory which provides a simple and consistent power counting for
renormalized diagrams. The method involves finite subtractions of dimensionally
regularized diagrams beyond the standard $\bar{\rm MS}$ scheme of chiral
perturbation theory to remove contributions violating the power counting. This
is achieved by a suitable renormalization of the parameters of the most general
effective Lagrangian. In addition to simplicity our method has the benefit that
it can be easily applied to multiloop diagrams. As an application we discuss
the mass and the scalar form factor of the nucleon and compare the results with
the expressions of the infrared regularization of Becher and Leutwyler.
| [
{
"created": "Fri, 14 Feb 2003 16:44:00 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Sep 2003 12:42:57 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Fuchs",
"T.",
""
],
[
"Gegelia",
"J.",
""
],
[
"Japaridze",
"G.",
""
],
[
"Scherer",
"S.",
""
]
] | We discuss a renormalization scheme for relativistic baryon chiral perturbation theory which provides a simple and consistent power counting for renormalized diagrams. The method involves finite subtractions of dimensionally regularized diagrams beyond the standard $\bar{\rm MS}$ scheme of chiral perturbation theory to remove contributions violating the power counting. This is achieved by a suitable renormalization of the parameters of the most general effective Lagrangian. In addition to simplicity our method has the benefit that it can be easily applied to multiloop diagrams. As an application we discuss the mass and the scalar form factor of the nucleon and compare the results with the expressions of the infrared regularization of Becher and Leutwyler. |
hep-ph/0503203 | Ulrich Ellwanger | Ulrich Ellwanger, John F. Gunion, Cyril Hugonie | Difficult Scenarios for NMSSM Higgs Discovery at the LHC | 31 pages, 5 figures | JHEP0507:041,2005 | 10.1088/1126-6708/2005/07/041 | LPT-Orsay-05-13, UCD-2005-04 | hep-ph | null | We identify scenarios not ruled out by LEP data in which NMSSM Higgs
detection at the LHC will be particularly challenging. We first review the
`no-lose' theorem for Higgs discovery at the LHC that applies if Higgs bosons
do not decay to other Higgs bosons - namely, with L=300 fb^-1, there is always
one or more `standard' Higgs detection channel with at least a 5 sigma signal.
However, we provide examples of no-Higgs-to-Higgs cases for which all the
standard signals are no larger than 7 sigma implying that if the available L is
smaller or the simulations performed by ATLAS and CMS turn out to be overly
optimistic, all standard Higgs signals could fall below 5 sigma even in the
no-Higgs-to-Higgs part of NMSSM parameter space. In the vast bulk of NMSSM
parameter space, there will be Higgs-to-Higgs decays. We show that when such
decays are present it is possible for all the standard detection channels to
have very small significance. In most such cases, the only strongly produced
Higgs boson is one with fairly SM-like couplings that decays to two lighter
Higgs bosons (either a pair of the lightest CP-even Higgs bosons, or, in the
largest part of parameter space, a pair of the lightest CP-odd Higgs bosons). A
number of representative bench-mark scenarios of this type are delineated in
detail and implications for Higgs discovery at various colliders are discussed.
| [
{
"created": "Mon, 21 Mar 2005 17:38:35 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Ellwanger",
"Ulrich",
""
],
[
"Gunion",
"John F.",
""
],
[
"Hugonie",
"Cyril",
""
]
] | We identify scenarios not ruled out by LEP data in which NMSSM Higgs detection at the LHC will be particularly challenging. We first review the `no-lose' theorem for Higgs discovery at the LHC that applies if Higgs bosons do not decay to other Higgs bosons - namely, with L=300 fb^-1, there is always one or more `standard' Higgs detection channel with at least a 5 sigma signal. However, we provide examples of no-Higgs-to-Higgs cases for which all the standard signals are no larger than 7 sigma implying that if the available L is smaller or the simulations performed by ATLAS and CMS turn out to be overly optimistic, all standard Higgs signals could fall below 5 sigma even in the no-Higgs-to-Higgs part of NMSSM parameter space. In the vast bulk of NMSSM parameter space, there will be Higgs-to-Higgs decays. We show that when such decays are present it is possible for all the standard detection channels to have very small significance. In most such cases, the only strongly produced Higgs boson is one with fairly SM-like couplings that decays to two lighter Higgs bosons (either a pair of the lightest CP-even Higgs bosons, or, in the largest part of parameter space, a pair of the lightest CP-odd Higgs bosons). A number of representative bench-mark scenarios of this type are delineated in detail and implications for Higgs discovery at various colliders are discussed. |
hep-ph/0401200 | Julius Vanko | Viliam Pazma, Julius Vanko and Juraj Chovan | Exact solution for oscillations of two neutrinos within alternative
theory of neutrino oscillations | 8 pages | null | null | null | hep-ph | null | We present one point of contact between the standard theory of neutrino
oscillations and the alternative one, in which flavor neutrinos are described
by states with definite masses. We show that both theories give the same
results for static neutrinos only.
| [
{
"created": "Mon, 26 Jan 2004 09:19:54 GMT",
"version": "v1"
}
] | 2009-09-29 | [
[
"Pazma",
"Viliam",
""
],
[
"Vanko",
"Julius",
""
],
[
"Chovan",
"Juraj",
""
]
] | We present one point of contact between the standard theory of neutrino oscillations and the alternative one, in which flavor neutrinos are described by states with definite masses. We show that both theories give the same results for static neutrinos only. |
hep-ph/9910384 | masaaki Kuroda | M. Kuroda (Meiji-Gakuin University) and D. Schildknecht (Bielefeld
University) | Born-form approximation for e+ e- to W+ W- to 4 fermions(+gamma) | 16 pages with 3 figures,(eps files), Latex. Invited talk at the XXII
International School of Theoretical Physics, Ustron '99, Poland, September
1999 | Acta Phys.Polon.B30:3325-3339,1999 | null | null | hep-ph | null | We review the results on representing the differential cross section for
W-pair production, including W decay and hard-photon bremsstrahlung, in terms
of a Born-form approximation of fairly simple analytic form.
| [
{
"created": "Mon, 18 Oct 1999 13:52:56 GMT",
"version": "v1"
}
] | 2011-04-15 | [
[
"Kuroda",
"M.",
"",
"Meiji-Gakuin University"
],
[
"Schildknecht",
"D.",
"",
"Bielefeld\n University"
]
] | We review the results on representing the differential cross section for W-pair production, including W decay and hard-photon bremsstrahlung, in terms of a Born-form approximation of fairly simple analytic form. |
1808.06816 | Vakhid Gani | Vakhid A. Gani, Maxim Yu. Khlopov, Dmitry N. Voskresensky | Double charged heavy constituents of dark atoms and superheavy nuclear
objects | 15 pages; v2: some changes in the Introduction and Conclusion
sections, references added; matches the published version | Phys. Rev. D 99, 015024 (2019) | 10.1103/PhysRevD.99.015024 | null | hep-ph astro-ph.CO nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the model of composite dark matter assuming stable particles of
charge $-2$ bound with primordial helium nuclei by Coulomb force in $O$He
atoms. We study capture of such dark atoms in matter and propose a possibility
of existence of stable $O$-enriched superheavy nuclei and $O$-nuclearites, in
which heavy $O$-dark matter fermions are bound by electromagnetic forces with
ordinary nuclear matter. $O$He atoms accumulation in stars and its possible
effect in stellar evolution is also considered, extending the set of indirect
probes for composite dark matter.
| [
{
"created": "Tue, 21 Aug 2018 09:35:37 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Jan 2019 15:20:34 GMT",
"version": "v2"
}
] | 2019-01-18 | [
[
"Gani",
"Vakhid A.",
""
],
[
"Khlopov",
"Maxim Yu.",
""
],
[
"Voskresensky",
"Dmitry N.",
""
]
] | We consider the model of composite dark matter assuming stable particles of charge $-2$ bound with primordial helium nuclei by Coulomb force in $O$He atoms. We study capture of such dark atoms in matter and propose a possibility of existence of stable $O$-enriched superheavy nuclei and $O$-nuclearites, in which heavy $O$-dark matter fermions are bound by electromagnetic forces with ordinary nuclear matter. $O$He atoms accumulation in stars and its possible effect in stellar evolution is also considered, extending the set of indirect probes for composite dark matter. |
1308.1105 | Arman Esmaili | Arman Esmaili and Pasquale Dario Serpico | Are IceCube neutrinos unveiling PeV-scale decaying dark matter? | 7 pages, 3 figures; v2: discussion improved, reference added, matches
the version published in JCAP | JCAP 1311 (2013) 054 | 10.1088/1475-7516/2013/11/054 | null | hep-ph astro-ph.CO astro-ph.HE hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent observations by IceCube, notably two PeV cascades accompanied by
events at energies ~ (30-400) TeV, are clearly in excess over atmospheric
background fluxes and beg for an astroparticle physics explanation. Although
some models of astrophysical accelerators can account for the observations
within current statistics, intriguing features in the energy and possibly
angular distributions of the events make worth exploring alternatives. Here, we
entertain the possibility of interpreting the data with a few PeV mass scale
decaying Dark Matter, with lifetime of the order of 10^27 s. We discuss generic
signatures of this scenario, including its unique energy spectrum distortion
with respect to the benchmark $E_\nu^{-2}$ expectation for astrophysical
sources, as well as peculiar anisotropies. A direct comparison with the data
show a good match with the above-mentioned features. We further discuss
possible future checks of this scenario.
| [
{
"created": "Mon, 5 Aug 2013 20:01:06 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Dec 2013 16:36:26 GMT",
"version": "v2"
}
] | 2013-12-03 | [
[
"Esmaili",
"Arman",
""
],
[
"Serpico",
"Pasquale Dario",
""
]
] | Recent observations by IceCube, notably two PeV cascades accompanied by events at energies ~ (30-400) TeV, are clearly in excess over atmospheric background fluxes and beg for an astroparticle physics explanation. Although some models of astrophysical accelerators can account for the observations within current statistics, intriguing features in the energy and possibly angular distributions of the events make worth exploring alternatives. Here, we entertain the possibility of interpreting the data with a few PeV mass scale decaying Dark Matter, with lifetime of the order of 10^27 s. We discuss generic signatures of this scenario, including its unique energy spectrum distortion with respect to the benchmark $E_\nu^{-2}$ expectation for astrophysical sources, as well as peculiar anisotropies. A direct comparison with the data show a good match with the above-mentioned features. We further discuss possible future checks of this scenario. |
1510.00171 | Piotr Lebiedowicz | Piotr Lebiedowicz and Antoni Szczurek | Production of charged Higgs boson pairs in the $pp \to ppH^{+}H^{-}$
reaction at the LHC and FCC | 6 pages, 3 figures, presented by P. Lebiedowicz at The European
Physical Society Conference on High Energy Physics, 22-29 July 2015, Vienna,
Austria | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present differential cross sections for the $pp \to ppH^{+}H^{-}$ reaction
via photon-photon fusion with exact kinematics. We show predictions for
$\sqrt{s}$ = 14 TeV (LHC) and at the Future Circular Collider (FCC) for
$\sqrt{s}$ = 100 TeV. The integrated cross section for $\sqrt{s}$ = 14~TeV
(LHC) is about 0.1~fb and about 0.9~fb at the FCC for $\sqrt{s}$ = 100~TeV when
assuming $m_{H^{\pm}} = 150$~GeV. We present distributions in diHiggs boson
invariant mass. The results are compared with those obtained within
equivalent-photon approximation. We discuss also first calculations of cross
section for exclusive diffractive pQCD mechanism with estimated limits on the
$g_{hH^{+}H^{-}}$ coupling constant within 2HDM based on the LHC experimental
data. The diffractive contribution is much smaller than the $\gamma \gamma$
one. Absorption corrections are calculated differentially for various
distributions. In general, they lead to a damping of the cross section. The
damping depends on $M_{H^{+}H^{-}}$ invariant mass and on four-momentum
transfers squared in the proton line. We discuss a possibility to measure the
exclusive production of $H^{\pm}$ bosons.
| [
{
"created": "Thu, 1 Oct 2015 10:14:49 GMT",
"version": "v1"
}
] | 2015-10-02 | [
[
"Lebiedowicz",
"Piotr",
""
],
[
"Szczurek",
"Antoni",
""
]
] | We present differential cross sections for the $pp \to ppH^{+}H^{-}$ reaction via photon-photon fusion with exact kinematics. We show predictions for $\sqrt{s}$ = 14 TeV (LHC) and at the Future Circular Collider (FCC) for $\sqrt{s}$ = 100 TeV. The integrated cross section for $\sqrt{s}$ = 14~TeV (LHC) is about 0.1~fb and about 0.9~fb at the FCC for $\sqrt{s}$ = 100~TeV when assuming $m_{H^{\pm}} = 150$~GeV. We present distributions in diHiggs boson invariant mass. The results are compared with those obtained within equivalent-photon approximation. We discuss also first calculations of cross section for exclusive diffractive pQCD mechanism with estimated limits on the $g_{hH^{+}H^{-}}$ coupling constant within 2HDM based on the LHC experimental data. The diffractive contribution is much smaller than the $\gamma \gamma$ one. Absorption corrections are calculated differentially for various distributions. In general, they lead to a damping of the cross section. The damping depends on $M_{H^{+}H^{-}}$ invariant mass and on four-momentum transfers squared in the proton line. We discuss a possibility to measure the exclusive production of $H^{\pm}$ bosons. |
2205.11766 | Atsuya Niki | Takeo Moroi and Atsuya Niki | Leptophilic Gauge Bosons at Lepton Beam Dump Experiments | null | null | 10.1007/JHEP05(2023)016 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | It has been recently known that we can use beams of future lepton colliders,
the International Linear Collider (ILC), the Compact Linear Collider (CLIC),
and the muon collider, for beam dump experiments if a shield and a detector are
installed behind the beam dump. We study the prospect of searching for
leptophilic gauge bosons (LGBs) in association with $U(1)_{L_e-L_\mu}$,
$U(1)_{L_e-L_\tau}$, and $U(1)_{L_\mu-L_\tau}$ gauge symmetries at such lepton
beam dump experiments. We perform a detailed calculation of the event rates of
the LGB events, taking into account bremsstrahlung and pair-annihilation
processes. We show that the lepton beam dump experiments at future lepton
colliders can reach parameter regions which are not been covered.
| [
{
"created": "Tue, 24 May 2022 04:04:10 GMT",
"version": "v1"
}
] | 2023-05-24 | [
[
"Moroi",
"Takeo",
""
],
[
"Niki",
"Atsuya",
""
]
] | It has been recently known that we can use beams of future lepton colliders, the International Linear Collider (ILC), the Compact Linear Collider (CLIC), and the muon collider, for beam dump experiments if a shield and a detector are installed behind the beam dump. We study the prospect of searching for leptophilic gauge bosons (LGBs) in association with $U(1)_{L_e-L_\mu}$, $U(1)_{L_e-L_\tau}$, and $U(1)_{L_\mu-L_\tau}$ gauge symmetries at such lepton beam dump experiments. We perform a detailed calculation of the event rates of the LGB events, taking into account bremsstrahlung and pair-annihilation processes. We show that the lepton beam dump experiments at future lepton colliders can reach parameter regions which are not been covered. |
0710.1955 | Nikolaos Stefanis | I. O. Cherednikov, N. G. Stefanis | Renormalization, Wilson lines, and transverse-momentum dependent parton
distribution functions | 4 pages, 3 figures embedded. v2: derivation of transverse gauge link
added including one more figure. Text expanded to 6 pages. Four references
added. Conclusions unchanged. Matches version to appear in PRD | Phys.Rev.D77:094001,2008 | 10.1103/PhysRevD.77.094001 | RUB-TPII-05/07 | hep-ph | null | We perform an analysis of transverse-momentum dependent parton distribution
functions, making use of their renormalization properties in terms of their
leading-order anomalous dimensions. We show that the appropriate Wilson line in
the light-cone gauge, associated with such quantities, is a cusped one. To
cancel the ensuing cusp anomalous dimension, we include in the definition of
the transverse-momentum dependent parton distribution functions an additional
soft counter term (gauge link) along that contour. We demonstrate that this is
tantamount to an ``intrinsic (Coulomb) phase'', which accumulates the full
gauge history of the color-charged particle.
| [
{
"created": "Wed, 10 Oct 2007 09:31:11 GMT",
"version": "v1"
},
{
"created": "Mon, 17 Mar 2008 14:05:19 GMT",
"version": "v2"
},
{
"created": "Thu, 1 May 2008 17:23:46 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Cherednikov",
"I. O.",
""
],
[
"Stefanis",
"N. G.",
""
]
] | We perform an analysis of transverse-momentum dependent parton distribution functions, making use of their renormalization properties in terms of their leading-order anomalous dimensions. We show that the appropriate Wilson line in the light-cone gauge, associated with such quantities, is a cusped one. To cancel the ensuing cusp anomalous dimension, we include in the definition of the transverse-momentum dependent parton distribution functions an additional soft counter term (gauge link) along that contour. We demonstrate that this is tantamount to an ``intrinsic (Coulomb) phase'', which accumulates the full gauge history of the color-charged particle. |
hep-ph/0611013 | Louis J. Clavelli | L. Clavelli and T. Lovorn | Ionic Binding in a Susy Background | published version, 14 pages | Int.J.Mod.Phys.A22:2133-2144,2007 | 10.1142/S0217751X07036518 | null | hep-ph physics.atm-clus | null | From string theory and the observation of a positive vacuum energy in our
universe it seems inevitable that there will eventually be a phase transition
to an exactly supersymmetric (susy) universe. In this phase there will be an
effective weakening of the Pauli principle due to fermi-bose degeneracy. As a
consequence molecular binding will be significantly affected. We make some
general comments on susy molecules and perform a variational principle estimate
of ionic binding energies.
| [
{
"created": "Wed, 1 Nov 2006 20:32:54 GMT",
"version": "v1"
},
{
"created": "Fri, 8 Jun 2007 13:15:43 GMT",
"version": "v2"
}
] | 2010-10-27 | [
[
"Clavelli",
"L.",
""
],
[
"Lovorn",
"T.",
""
]
] | From string theory and the observation of a positive vacuum energy in our universe it seems inevitable that there will eventually be a phase transition to an exactly supersymmetric (susy) universe. In this phase there will be an effective weakening of the Pauli principle due to fermi-bose degeneracy. As a consequence molecular binding will be significantly affected. We make some general comments on susy molecules and perform a variational principle estimate of ionic binding energies. |
2207.06238 | Rhitaja Sengupta | Rahool Kumar Barman, Genevi\`eve B\'elanger, Biplob Bhattacherjee,
Rohini M. Godbole, Rhitaja Sengupta | Is the light neutralino thermal dark matter in the pMSSM ruled out? | 11 pages, 3 figures, 1 table; v2: version published in PRL | Phys. Rev. Lett. 131, 011802 (2023) | 10.1103/PhysRevLett.131.011802 | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | We explore the parameter space of the phenomenological Minimal Supersymmetric
Standard Model (pMSSM) with a light neutralino thermal dark matter
($m_{\tilde{\chi}_1^0} \leq m_h/2$) that is consistent with current collider
and astrophysical constraints. We consider both positive and negative values of
the higgsino mass parameter ($\mu$). Our investigation shows that the recent
experimental results from the LHC as well as from direct detection searches for
dark matter by the LUX-ZEPLIN (LZ) collaboration rule out the $Z$-funnel region
for the $\mu>0$ scenario. The same results severely restrict the $h$-funnel
region for positive $\mu$, however, the allowed points can be probed easily
with few more days of data from the LZ experiment. In the $\mu<0$ scenario, we
find that very light higgsinos in both the $Z$ and $h$ funnels might survive
the present constraints from the electroweakino searches at the LHC, and
dedicated efforts from experimental collaborations are necessary to make
conclusive statements about their present status.
| [
{
"created": "Wed, 13 Jul 2022 14:33:03 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Jul 2023 12:04:29 GMT",
"version": "v2"
}
] | 2023-07-20 | [
[
"Barman",
"Rahool Kumar",
""
],
[
"Bélanger",
"Geneviève",
""
],
[
"Bhattacherjee",
"Biplob",
""
],
[
"Godbole",
"Rohini M.",
""
],
[
"Sengupta",
"Rhitaja",
""
]
] | We explore the parameter space of the phenomenological Minimal Supersymmetric Standard Model (pMSSM) with a light neutralino thermal dark matter ($m_{\tilde{\chi}_1^0} \leq m_h/2$) that is consistent with current collider and astrophysical constraints. We consider both positive and negative values of the higgsino mass parameter ($\mu$). Our investigation shows that the recent experimental results from the LHC as well as from direct detection searches for dark matter by the LUX-ZEPLIN (LZ) collaboration rule out the $Z$-funnel region for the $\mu>0$ scenario. The same results severely restrict the $h$-funnel region for positive $\mu$, however, the allowed points can be probed easily with few more days of data from the LZ experiment. In the $\mu<0$ scenario, we find that very light higgsinos in both the $Z$ and $h$ funnels might survive the present constraints from the electroweakino searches at the LHC, and dedicated efforts from experimental collaborations are necessary to make conclusive statements about their present status. |
1408.0983 | Emiliano Molinaro | A. G. Hessler, A. Ibarra, E. Molinaro, S. Vogl | On the impact of the Higgs boson on the production of exotic particles
at the LHC | 20 pages, 5 figures; results unchanged; version published on Physical
Review D | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Many new physics models contain new particles that interact with the Higgs
boson. These particles could be produced at the LHC via gluon-gluon fusion with
an off-shell Higgs, as well as via the Drell-Yan process if charged under a
gauge group. We consider in this paper simplified scenarios where the Standard
Model is extended by one scalar or fermionic field that interacts with the
Higgs boson and we evaluate the impact of the Higgs interaction on the
production of the exotic particles at the LHC. This analysis applies in
particular to TeV scale seesaw scenarios of neutrino mass generation.
| [
{
"created": "Tue, 5 Aug 2014 14:21:33 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Dec 2014 10:21:04 GMT",
"version": "v2"
},
{
"created": "Thu, 28 May 2015 04:22:21 GMT",
"version": "v3"
}
] | 2015-05-29 | [
[
"Hessler",
"A. G.",
""
],
[
"Ibarra",
"A.",
""
],
[
"Molinaro",
"E.",
""
],
[
"Vogl",
"S.",
""
]
] | Many new physics models contain new particles that interact with the Higgs boson. These particles could be produced at the LHC via gluon-gluon fusion with an off-shell Higgs, as well as via the Drell-Yan process if charged under a gauge group. We consider in this paper simplified scenarios where the Standard Model is extended by one scalar or fermionic field that interacts with the Higgs boson and we evaluate the impact of the Higgs interaction on the production of the exotic particles at the LHC. This analysis applies in particular to TeV scale seesaw scenarios of neutrino mass generation. |
0801.4347 | Sergio Scopetta | A. Courtoy, F. Fratini, S. Scopetta, V. Vento | A quark model analysis of the Sivers function | 31 pages, 4 figures. Extended version, discussion of the Burkardt Sum
Rule added, references added, minor changes in the numerical results, same
interpretation. Final version accepted for publication in Phys. Rev. D | Phys.Rev.D78:034002,2008 | 10.1103/PhysRevD.78.034002 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We develop a formalism to evaluate the Sivers function. The approach is well
suited for calculations which use constituent quark models to describe the
structure of the nucleon. A non-relativistic reduction of the scheme is
performed and applied to the Isgur-Karl model of hadron structure. The results
obtained are consistent with a sizable Sivers effect and the signs for the u
and d flavor contributions turn out to be opposite. This pattern is in
agreement with the one found analyzing, in the same model, the impact parameter
dependent generalized parton distributions. The Burkardt Sum Rule turns out to
be fulfilled to a large extent. We estimate the QCD evolution of our results
from the momentum scale of the model to the experimental one and obtain
reasonable agreement with the available data.
| [
{
"created": "Mon, 28 Jan 2008 18:28:18 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Jul 2008 16:28:55 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Courtoy",
"A.",
""
],
[
"Fratini",
"F.",
""
],
[
"Scopetta",
"S.",
""
],
[
"Vento",
"V.",
""
]
] | We develop a formalism to evaluate the Sivers function. The approach is well suited for calculations which use constituent quark models to describe the structure of the nucleon. A non-relativistic reduction of the scheme is performed and applied to the Isgur-Karl model of hadron structure. The results obtained are consistent with a sizable Sivers effect and the signs for the u and d flavor contributions turn out to be opposite. This pattern is in agreement with the one found analyzing, in the same model, the impact parameter dependent generalized parton distributions. The Burkardt Sum Rule turns out to be fulfilled to a large extent. We estimate the QCD evolution of our results from the momentum scale of the model to the experimental one and obtain reasonable agreement with the available data. |
2012.14786 | Changxin Liu | Chang-Xin Liu, Hai-Bin Zhang, Jin-Lei Yang, Shu-Min Zhao, Tai-Fu Feng | Lightest Higgs boson decays $h\rightarrow MZ$ in the $\mu$ from $\nu$
supersymmetric standard model | 30 pages, 11 figures. Published in JHEP | JHEP 05 (2023) 134 | 10.1007/JHEP05(2023)134 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We study the lightest Higgs boson decays $h\rightarrow MZ$ in the $\mu$ from
$\nu$ supersymmetric standard model ($\mu\nu$SSM), where $M$ is a vector meson
$(\rho,\omega,\phi,J/\Psi,\Upsilon)$. Compared to the minimal supersymmetric
standard model (MSSM), the $\mu\nu$SSM introduces three right-handed neutrino
superfields, which lead to the mixing of the Higgs doublets with the
right-handed sneutrinos. The mixing affects the lightest Higgs boson mass and
the Higgs couplings. In suitable parameter space, the $\mu\nu$SSM can give
large new physics (NP) contributions to the signal strengths of $h\rightarrow
MZ$ and $h\rightarrow \gamma\gamma$, which may be detected by a 100 TeV
collider or the other future high energy colliders.
| [
{
"created": "Tue, 29 Dec 2020 14:58:18 GMT",
"version": "v1"
},
{
"created": "Wed, 17 May 2023 01:04:52 GMT",
"version": "v2"
}
] | 2023-05-18 | [
[
"Liu",
"Chang-Xin",
""
],
[
"Zhang",
"Hai-Bin",
""
],
[
"Yang",
"Jin-Lei",
""
],
[
"Zhao",
"Shu-Min",
""
],
[
"Feng",
"Tai-Fu",
""
]
] | We study the lightest Higgs boson decays $h\rightarrow MZ$ in the $\mu$ from $\nu$ supersymmetric standard model ($\mu\nu$SSM), where $M$ is a vector meson $(\rho,\omega,\phi,J/\Psi,\Upsilon)$. Compared to the minimal supersymmetric standard model (MSSM), the $\mu\nu$SSM introduces three right-handed neutrino superfields, which lead to the mixing of the Higgs doublets with the right-handed sneutrinos. The mixing affects the lightest Higgs boson mass and the Higgs couplings. In suitable parameter space, the $\mu\nu$SSM can give large new physics (NP) contributions to the signal strengths of $h\rightarrow MZ$ and $h\rightarrow \gamma\gamma$, which may be detected by a 100 TeV collider or the other future high energy colliders. |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.