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2310.12847
|
Hongxi Xing
|
Yu Fu, Zhong-Bo Kang, Farid Salazar, Xin-Nian Wang, Hongxi Xing
|
Correspondence between Color Glass Condensate and High-Twist Formalism
|
7 pages, 3 figures + supplemental material
| null | null | null |
hep-ph hep-ex nucl-ex nucl-th
|
http://creativecommons.org/licenses/by/4.0/
|
The Color Glass Condensate (CGC) effective theory and the collinear
factorization at high-twist (HT) are two well-known frameworks describing
perturbative QCD multiple scatterings in nuclear media. It has long been
recognized that these two formalisms have their own domain of validity in
different kinematics regions. Taking direct photon production in proton-nucleus
collisions as an example, we clarify for the first time the relation between
CGC and HT at the level of a physical observable. We show that the CGC
formalism beyond shock-wave approximation, and with the
Landau-Pomeranchuk-Migdal interference effect is consistent with the HT
formalism in the transition region where they overlap. Such a unified picture
paves the way for mapping out the phase diagram of parton density in nuclear
medium from dilute to dense region.
|
[
{
"created": "Thu, 19 Oct 2023 15:57:27 GMT",
"version": "v1"
}
] |
2023-10-20
|
[
[
"Fu",
"Yu",
""
],
[
"Kang",
"Zhong-Bo",
""
],
[
"Salazar",
"Farid",
""
],
[
"Wang",
"Xin-Nian",
""
],
[
"Xing",
"Hongxi",
""
]
] |
The Color Glass Condensate (CGC) effective theory and the collinear factorization at high-twist (HT) are two well-known frameworks describing perturbative QCD multiple scatterings in nuclear media. It has long been recognized that these two formalisms have their own domain of validity in different kinematics regions. Taking direct photon production in proton-nucleus collisions as an example, we clarify for the first time the relation between CGC and HT at the level of a physical observable. We show that the CGC formalism beyond shock-wave approximation, and with the Landau-Pomeranchuk-Migdal interference effect is consistent with the HT formalism in the transition region where they overlap. Such a unified picture paves the way for mapping out the phase diagram of parton density in nuclear medium from dilute to dense region.
|
1701.08889
|
Vyacheslav Klyukhin
|
V. I. Klyukhin, A. A. Neushkin, A. A. Sokolov
|
On a possibility to extract a signal from heavy gluino cascade decays
via isolated muon detection at the LHC energies
|
21 pages, 28 figures
| null | null |
ATLAS Internal Note PHYS-No-30, 7 September 1993
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
800 GeV gluino pair production is simulated using ISASUSY 1.1 MC-program. The
cascade decay of the gluino into two lightest neutralinos, $\widetilde{g}
\rightarrow \widetilde{\chi}_2^0 X$, $\widetilde{\chi}_2^0 \rightarrow \mu^+
\mu^- \widetilde{\chi}_1^0$, is studied for a convenient set of SUSY
parameters: $\mu$ = 200 GeV, tan$\beta$ = 2, average squark masses of 1600 GeV,
charged Higgs mass of 500 GeV, and top quark mass of 140 GeV. With such
parameters the mass difference between $\widetilde{\chi}_2^0$ and
$\widetilde{\chi}_1^0$ is less than the mass of Z. As a background, $t\bar{t}$,
Z + jets, WW, WZ and ZZ events were generated using ISAJET 6.50 MC-program. The
granularities and energy resolutions of the calorimeters in the pseudorapidity
range of $\mid\eta\mid$ < 5 are taken into account. If missing transverse
momentum is greater than 200 GeV, the number of jets in the calorimeters is 4
or more, the invariant mass of two isolated muons is less than 80 GeV, the
background in the muon transverse momentum distribution is negligible.
|
[
{
"created": "Tue, 31 Jan 2017 02:24:38 GMT",
"version": "v1"
}
] |
2017-02-01
|
[
[
"Klyukhin",
"V. I.",
""
],
[
"Neushkin",
"A. A.",
""
],
[
"Sokolov",
"A. A.",
""
]
] |
800 GeV gluino pair production is simulated using ISASUSY 1.1 MC-program. The cascade decay of the gluino into two lightest neutralinos, $\widetilde{g} \rightarrow \widetilde{\chi}_2^0 X$, $\widetilde{\chi}_2^0 \rightarrow \mu^+ \mu^- \widetilde{\chi}_1^0$, is studied for a convenient set of SUSY parameters: $\mu$ = 200 GeV, tan$\beta$ = 2, average squark masses of 1600 GeV, charged Higgs mass of 500 GeV, and top quark mass of 140 GeV. With such parameters the mass difference between $\widetilde{\chi}_2^0$ and $\widetilde{\chi}_1^0$ is less than the mass of Z. As a background, $t\bar{t}$, Z + jets, WW, WZ and ZZ events were generated using ISAJET 6.50 MC-program. The granularities and energy resolutions of the calorimeters in the pseudorapidity range of $\mid\eta\mid$ < 5 are taken into account. If missing transverse momentum is greater than 200 GeV, the number of jets in the calorimeters is 4 or more, the invariant mass of two isolated muons is less than 80 GeV, the background in the muon transverse momentum distribution is negligible.
|
hep-ph/0103195
|
Teruyuki Kitabayashi
|
Teruyuki Kitabayashi
|
Comment on Neutrino Masses and Oscillations in an $SU(3)_L \times
U(1)_N$ Model with Radiative Mechanism
|
6 Pages, Latex2e, RevTex macro
|
Phys.Rev. D64 (2001) 057301
|
10.1103/PhysRevD.64.057301
| null |
hep-ph
| null |
We discussed how neutrino masses and oscillations are radiatively generated
in an $SU(3)_L$ $\times$ $U(1)_N$ gauge model with a symmetry based on
$L_e-L_\mu-L_\tau$ ($\equiv$$L^\prime$). The model is characterized by lepton
triplets $\psi^i=(\nu^i,\ell^{-i},E^{-i})$, where $E^{-i}$ are negatively
charged heavy leptons, an $SU(3)_L$ triplet Higgs scalar $\xi$ and a singlet
Higgs scalar $k^{++}$. These Higgs scalars can be interpreted as a Zee's and
Zee-Babu's scalar for radiative mechanisms. We demonstrated that the mass
hierarchy of $\Delta m_{atm}^2$ $\gg$ $\Delta m_\odot^2$ arise as a consequence
of the dynamical hierarchy between $L^\prime$-conserving one-loop effects and
$L^\prime$-violating two-loop effects, and our model is relevant to yield
quasivacuum solution for solar neutrino problem.
|
[
{
"created": "Sun, 18 Mar 2001 04:51:23 GMT",
"version": "v1"
}
] |
2009-11-07
|
[
[
"Kitabayashi",
"Teruyuki",
""
]
] |
We discussed how neutrino masses and oscillations are radiatively generated in an $SU(3)_L$ $\times$ $U(1)_N$ gauge model with a symmetry based on $L_e-L_\mu-L_\tau$ ($\equiv$$L^\prime$). The model is characterized by lepton triplets $\psi^i=(\nu^i,\ell^{-i},E^{-i})$, where $E^{-i}$ are negatively charged heavy leptons, an $SU(3)_L$ triplet Higgs scalar $\xi$ and a singlet Higgs scalar $k^{++}$. These Higgs scalars can be interpreted as a Zee's and Zee-Babu's scalar for radiative mechanisms. We demonstrated that the mass hierarchy of $\Delta m_{atm}^2$ $\gg$ $\Delta m_\odot^2$ arise as a consequence of the dynamical hierarchy between $L^\prime$-conserving one-loop effects and $L^\prime$-violating two-loop effects, and our model is relevant to yield quasivacuum solution for solar neutrino problem.
|
hep-ph/0408250
|
Nobuhito Maru
|
K. Hasegawa, C.S. Lim and Nobuhito Maru
|
Towards Gravity-Gauge-Higgs Unification
|
2 pages, Talk presented by N.M. at YITP workshop on ``Quantum Field
Theory 2004'', Yukawa Institute for Theoretical Physics at Kyoto University,
Japan, July 13-16, 2004
| null | null | null |
hep-ph
| null |
We discuss a possibility to solve the gauge hierarchy problem in the
framework of Gravity-Gauge-Higgs Unification scenario. We have calculated
1-loop correction to the mass of the scalar field, which is originated from
55-component of the metric, in five dimensional gravity theory with the bulk
scalar field compactified on S^1. It is shown that the quadratic divergences
are canceled and the finite mass is generated by explicit diagrammatic
calculations and the effective potential calculations.
|
[
{
"created": "Tue, 24 Aug 2004 03:27:28 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Hasegawa",
"K.",
""
],
[
"Lim",
"C. S.",
""
],
[
"Maru",
"Nobuhito",
""
]
] |
We discuss a possibility to solve the gauge hierarchy problem in the framework of Gravity-Gauge-Higgs Unification scenario. We have calculated 1-loop correction to the mass of the scalar field, which is originated from 55-component of the metric, in five dimensional gravity theory with the bulk scalar field compactified on S^1. It is shown that the quadratic divergences are canceled and the finite mass is generated by explicit diagrammatic calculations and the effective potential calculations.
|
1610.00288
|
Rui-Lin Zhu
|
Ruilin Zhu and Jian-Ping Dai
|
Radiative $h_{c/b}$ decays to $\eta$ or $\eta^\prime$
|
6 pages, 2 figures, and 1 table;To appear in Physical Review D
|
Phys. Rev. D 94, 094034 (2016)
|
10.1103/PhysRevD.94.094034
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Motivated by recent measurements of the radiative decay rates of the
\emph{P}-wave spin singlet charmonium $h_c$ to the light meson $\eta$ or
$\eta^\prime$ by the BESIII Collaboration, we investigate the decay rates of
these channels at order $\alpha \alpha_s^4$. The photon is radiated mainly from
charm quark pairs in the lowest order Feynman diagrams, since the diagrams
where a photon radiated from light quarks are suppressed by $\alpha_s$ or the
relative charm quark velocity $v$, due to Charge parity conservation. The form
factors of two gluons to $\eta$ or $\eta^\prime$ are employed, which are the
major mechanism for $\eta$ and $\eta^\prime$ productions. $\eta(\eta^\prime)$
is treated as a light cone object when we consider that the parent charmonium
mass is much heavier than that of the final light meson. We obtain the
branching ratio ${\cal B}(h_c\to \gamma\eta^\prime) =
(1.94^{+0.70}_{-0.51})\times 10^{-3}$ in the nonrelativistic QCD approach,
which is in agreement with the BESIII measurement. The prediction of the
branching ratio of $h_c\to \gamma\eta$ is also within the range of experimental
error after including the larger uncertainty of the total decay width
$\Gamma_{h_c}$. The applications of these formulae to the radiative decays to
$\eta(\eta^\prime)$ of the \emph{P}-wave spin singlet bottomonium $h_b(nP)$ are
presented. These studies will shed some light on the $\eta - \eta^\prime$
mixing effects, the flavor SU(3) symmetry breaking, as well as the
nonperturbative dynamics of charmonium and bottomonium.
|
[
{
"created": "Sun, 2 Oct 2016 15:17:10 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Nov 2016 12:39:19 GMT",
"version": "v2"
}
] |
2016-12-07
|
[
[
"Zhu",
"Ruilin",
""
],
[
"Dai",
"Jian-Ping",
""
]
] |
Motivated by recent measurements of the radiative decay rates of the \emph{P}-wave spin singlet charmonium $h_c$ to the light meson $\eta$ or $\eta^\prime$ by the BESIII Collaboration, we investigate the decay rates of these channels at order $\alpha \alpha_s^4$. The photon is radiated mainly from charm quark pairs in the lowest order Feynman diagrams, since the diagrams where a photon radiated from light quarks are suppressed by $\alpha_s$ or the relative charm quark velocity $v$, due to Charge parity conservation. The form factors of two gluons to $\eta$ or $\eta^\prime$ are employed, which are the major mechanism for $\eta$ and $\eta^\prime$ productions. $\eta(\eta^\prime)$ is treated as a light cone object when we consider that the parent charmonium mass is much heavier than that of the final light meson. We obtain the branching ratio ${\cal B}(h_c\to \gamma\eta^\prime) = (1.94^{+0.70}_{-0.51})\times 10^{-3}$ in the nonrelativistic QCD approach, which is in agreement with the BESIII measurement. The prediction of the branching ratio of $h_c\to \gamma\eta$ is also within the range of experimental error after including the larger uncertainty of the total decay width $\Gamma_{h_c}$. The applications of these formulae to the radiative decays to $\eta(\eta^\prime)$ of the \emph{P}-wave spin singlet bottomonium $h_b(nP)$ are presented. These studies will shed some light on the $\eta - \eta^\prime$ mixing effects, the flavor SU(3) symmetry breaking, as well as the nonperturbative dynamics of charmonium and bottomonium.
|
hep-ph/0103140
|
Miguel Angel Sanchis
|
M.A. Sanchis-Lozano
|
Power scaling rules for charmonia production and HQEFT
|
LaTeX, 19 pages, 3 EPS figures
|
Int.J.Mod.Phys. A16 (2001) 4189-4206
|
10.1142/S0217751X01004852
|
IFIC/01-09, FTUV-01-0313
|
hep-ph
| null |
We discuss the power scaling rules along the lines of a complete Heavy Quark
Effective Field Theory (HQEFT) for the description of heavy quarkonium
production through a color-octet mechanism. To this end, we firstly derive a
tree-level heavy quark effective Lagrangian keeping both particle-antiparticle
mixed sectors allowing for heavy quark-antiquark pair annihilation and
creation, but describing only low-energy modes around the heavy quark mass.
Then we show the consistency of using HQEFT fields in constructing four-fermion
local operators a la NRQCD, to be identified with standard color-octet matrix
elements. We analyze some numerical values extracted from charmonia production
by different authors and their hierarchy in the light of HQEFT.
|
[
{
"created": "Tue, 13 Mar 2001 19:51:03 GMT",
"version": "v1"
}
] |
2009-11-07
|
[
[
"Sanchis-Lozano",
"M. A.",
""
]
] |
We discuss the power scaling rules along the lines of a complete Heavy Quark Effective Field Theory (HQEFT) for the description of heavy quarkonium production through a color-octet mechanism. To this end, we firstly derive a tree-level heavy quark effective Lagrangian keeping both particle-antiparticle mixed sectors allowing for heavy quark-antiquark pair annihilation and creation, but describing only low-energy modes around the heavy quark mass. Then we show the consistency of using HQEFT fields in constructing four-fermion local operators a la NRQCD, to be identified with standard color-octet matrix elements. We analyze some numerical values extracted from charmonia production by different authors and their hierarchy in the light of HQEFT.
|
1409.1222
|
Nikita Blinov
|
Nikita Blinov, Jonathan Kozaczuk, Arjun Menon, David E. Morrissey
|
Confronting the Moduli-Induced LSP Problem
|
References added
|
Phys. Rev. D 91, 035026 (2015)
|
10.1103/PhysRevD.91.035026
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Moduli fields with Planck-suppressed couplings to light species are common in
string compactifications. Decays of these moduli can reheat the universe at a
late time and produce dark matter non-thermally. For generic moduli fields
motivated by string theory with masses similar to that of the gravitino and
TeV-scale superpartners in the minimal supersymmetric Standard Model (MSSM),
the non-thermal production of the lightest superpartner (LSP) tends to create
an unacceptably large relic density or too strong of an indirect detection
signal. We call this the moduli-induced LSP problem of the MSSM. In this paper
we investigate extensions of the MSSM containing new LSP candidates that can
alleviate this tension. We examine the viability of this scenario in models
with light Abelian and non-Abelian hidden sectors, and symmetric or asymmetric
dark matter. In these extensions it is possible, though somewhat challenging,
to avoid a moduli-induced LSP problem. In all but the asymmetric scenario, the
LSP can account for only a small fraction of the observed dark matter density.
|
[
{
"created": "Wed, 3 Sep 2014 20:00:05 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Sep 2014 18:56:50 GMT",
"version": "v2"
},
{
"created": "Thu, 26 Feb 2015 17:33:12 GMT",
"version": "v3"
}
] |
2015-02-27
|
[
[
"Blinov",
"Nikita",
""
],
[
"Kozaczuk",
"Jonathan",
""
],
[
"Menon",
"Arjun",
""
],
[
"Morrissey",
"David E.",
""
]
] |
Moduli fields with Planck-suppressed couplings to light species are common in string compactifications. Decays of these moduli can reheat the universe at a late time and produce dark matter non-thermally. For generic moduli fields motivated by string theory with masses similar to that of the gravitino and TeV-scale superpartners in the minimal supersymmetric Standard Model (MSSM), the non-thermal production of the lightest superpartner (LSP) tends to create an unacceptably large relic density or too strong of an indirect detection signal. We call this the moduli-induced LSP problem of the MSSM. In this paper we investigate extensions of the MSSM containing new LSP candidates that can alleviate this tension. We examine the viability of this scenario in models with light Abelian and non-Abelian hidden sectors, and symmetric or asymmetric dark matter. In these extensions it is possible, though somewhat challenging, to avoid a moduli-induced LSP problem. In all but the asymmetric scenario, the LSP can account for only a small fraction of the observed dark matter density.
|
hep-ph/0109183
|
George J. Gounaris
|
G.J. Gounaris, E.A. Paschos and P.I. Porfyriadis
|
The ionization of H, He and Ne atoms using neutrinos or antineutrinos at
keV energies
|
13 pages, 5 figures: Realistic atomic wave functions are used
inducing numerical changes in the results. e-mail: gounaris@cern.ch
|
Phys.Lett. B525 (2002) 63-70
|
10.1016/S0370-2693(01)01415-0
|
DO-TH 01/12, THES-TP 2001/07
|
hep-ph
| null |
We calculate the ionization cross sections for H, He or Ne atoms using
$\nu_e$ and $\bar \nu_e$ scattering at keV energies. Such cross sections are
useful for e.g. $\bar \nu_e$-oscillation experiments using a tritium source.
Using realistic atomic wave functions, we find that for $E_\nu \lsim 10 ~\rm
keV $ the atomic ionization cross sections, normalized to one electron per unit
volume, are smaller than the corresponding free electron ones, and that they
approach it from below as energies of 20 keV are reached.
|
[
{
"created": "Thu, 20 Sep 2001 13:02:57 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Sep 2001 14:22:17 GMT",
"version": "v2"
},
{
"created": "Wed, 10 Oct 2001 15:29:45 GMT",
"version": "v3"
},
{
"created": "Wed, 21 Nov 2001 07:18:46 GMT",
"version": "v4"
}
] |
2009-11-07
|
[
[
"Gounaris",
"G. J.",
""
],
[
"Paschos",
"E. A.",
""
],
[
"Porfyriadis",
"P. I.",
""
]
] |
We calculate the ionization cross sections for H, He or Ne atoms using $\nu_e$ and $\bar \nu_e$ scattering at keV energies. Such cross sections are useful for e.g. $\bar \nu_e$-oscillation experiments using a tritium source. Using realistic atomic wave functions, we find that for $E_\nu \lsim 10 ~\rm keV $ the atomic ionization cross sections, normalized to one electron per unit volume, are smaller than the corresponding free electron ones, and that they approach it from below as energies of 20 keV are reached.
|
hep-ph/9406360
|
Robert Peschanski
|
A. Bialas and R. Peschanski
|
Intermittency and Exotic Channels
|
5 p., plain tex, preprint T94/078(Saclay), LPTHE 94/58(Orsay)
|
Phys.Rev.D50:6003-6004,1994
|
10.1103/PhysRevD.50.6003
| null |
hep-ph
| null |
It is pointed out that accurate measurements of short-range two-particle
correlations in like-charge $ K\pi $ and in $ \pi^ 0\pi^ 0$ channels should be
very helpful in determining the origin of the \lq\lq intermittency\rq\rq\
phenomenon observed recently for the like-charge pion pairs.
|
[
{
"created": "Wed, 22 Jun 1994 09:42:57 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Bialas",
"A.",
""
],
[
"Peschanski",
"R.",
""
]
] |
It is pointed out that accurate measurements of short-range two-particle correlations in like-charge $ K\pi $ and in $ \pi^ 0\pi^ 0$ channels should be very helpful in determining the origin of the \lq\lq intermittency\rq\rq\ phenomenon observed recently for the like-charge pion pairs.
|
1707.09575
|
Chris Quigg
|
Estia J. Eichten and Chris Quigg
|
Heavy-quark symmetry implies stable heavy tetraquark mesons $Q_iQ_j \bar
q_k \bar q_l$
|
5 pages, RevTeX, version as published
|
Phys. Rev. Lett. 119, 202002 (2017)
|
10.1103/PhysRevLett.119.202002
|
FERMILAB-PUB-17/289-T
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
For very heavy quarks $Q$, relations derived from heavy-quark symmetry
predict the existence of novel narrow doubly heavy tetraquark states of the
form $Q_iQ_j \bar q_k \bar q_l$ (subscripts label flavors), where $q$
designates a light quark. By evaluating finite-mass corrections, we predict
that double-beauty states composed of $bb\bar u \bar d$, $bb\bar u \bar s$, and
$bb\bar d \bar s$ will be stable against strong decays, whereas the
double-charm states $cc \bar q_k \bar q_l$, mixed beauty+charm states $bc \bar
q_k \bar q_l$, and heavier $bb \bar q_k \bar q_l$ states will dissociate into
pairs of heavy-light mesons. Observation of a new double-beauty state through
its weak decays would establish the existence of tetraquarks and illuminate the
role of heavy color-antitriplet diquarks as hadron constituents.
|
[
{
"created": "Sun, 30 Jul 2017 02:30:30 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Nov 2017 17:57:59 GMT",
"version": "v2"
}
] |
2017-11-29
|
[
[
"Eichten",
"Estia J.",
""
],
[
"Quigg",
"Chris",
""
]
] |
For very heavy quarks $Q$, relations derived from heavy-quark symmetry predict the existence of novel narrow doubly heavy tetraquark states of the form $Q_iQ_j \bar q_k \bar q_l$ (subscripts label flavors), where $q$ designates a light quark. By evaluating finite-mass corrections, we predict that double-beauty states composed of $bb\bar u \bar d$, $bb\bar u \bar s$, and $bb\bar d \bar s$ will be stable against strong decays, whereas the double-charm states $cc \bar q_k \bar q_l$, mixed beauty+charm states $bc \bar q_k \bar q_l$, and heavier $bb \bar q_k \bar q_l$ states will dissociate into pairs of heavy-light mesons. Observation of a new double-beauty state through its weak decays would establish the existence of tetraquarks and illuminate the role of heavy color-antitriplet diquarks as hadron constituents.
|
hep-ph/0202070
|
Tadashi Yoshikawa
|
A.S. Dighe (MPI Munich), T. Hurth (CERN), C.S. Kim (Yonsei) and T.
Yoshikawa (North Carolina)
|
Measurement of the Width Difference of B_d Mesons
|
3 pages, LaTeX, Presented at the 5th KEK Topical Conference(KEKTC5)
|
Nucl.Phys.Proc.Suppl.111:267-269,2002
|
10.1016/S0920-5632(02)01717-6
| null |
hep-ph
| null |
We estimate \Delta Gamma_d/\Gamma_d, including 1/m_b contributions and part
of the next-to-leading order QCD corrections, and find it to be around 0.3%. We
show the methods to measure \Delta Gamma_d/\Gamma_d by using at least two
different final states on the untagged B_d decay. The nonzero width difference
can also be used to identify new physics effects and to resolve a twofold
discrete ambiguity in the B_d-\bar{B}_d mixing phase. With the high statistics
and accurate time resolution of the upcoming LHC experiment, the measurement of
\Delta Gamma_d seems to be possible. This measurement would be important for an
accurate measurement of \sin2\phi_1 at the LHC. We also derive an upper bound
on the value of \Delta Gamma_d/\Gamma_d in the presence of new physics.
|
[
{
"created": "Thu, 7 Feb 2002 16:17:53 GMT",
"version": "v1"
}
] |
2011-01-27
|
[
[
"Dighe",
"A. S.",
"",
"MPI Munich"
],
[
"Hurth",
"T.",
"",
"CERN"
],
[
"Kim",
"C. S.",
"",
"Yonsei"
],
[
"Yoshikawa",
"T.",
"",
"North Carolina"
]
] |
We estimate \Delta Gamma_d/\Gamma_d, including 1/m_b contributions and part of the next-to-leading order QCD corrections, and find it to be around 0.3%. We show the methods to measure \Delta Gamma_d/\Gamma_d by using at least two different final states on the untagged B_d decay. The nonzero width difference can also be used to identify new physics effects and to resolve a twofold discrete ambiguity in the B_d-\bar{B}_d mixing phase. With the high statistics and accurate time resolution of the upcoming LHC experiment, the measurement of \Delta Gamma_d seems to be possible. This measurement would be important for an accurate measurement of \sin2\phi_1 at the LHC. We also derive an upper bound on the value of \Delta Gamma_d/\Gamma_d in the presence of new physics.
|
0809.3717
|
Junko Yamagata-Sekihara
|
H. Nagahiro, J. Yamagata-Sekihara, E. Oset, S. Hirenzaki and R. Molina
|
The $\gamma \gamma$ decay of the $f_0(1370)$ and $f_2(1270)$ resonances
in the hidden gauge formalism
|
7 pages, 9 figures, proof of gauge invariance added
|
Phys.Rev.D79:114023,2009
|
10.1103/PhysRevD.79.114023
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Using recent results obtained within the hidden gauge formalism for vector
mesons, in which the $f_0(1370)$ and $f_2(1270)$ resonances are dynamically
generated resonances from the $\rho \rho$ interaction, we evaluate the
radiative decay of these resonances into $\gamma \gamma$. We obtain results for
the width in good agreement with the experimental data for the $f_2(1270)$
state and a width about a factor five smaller for the $f_0(1370)$ resonance,
which would agree with preliminary results from the Belle collaboration,
hinting at an order of magnitude smaller width for this resonance than for the
$f_2(1270)$.
|
[
{
"created": "Mon, 22 Sep 2008 14:25:50 GMT",
"version": "v1"
},
{
"created": "Fri, 13 Mar 2009 08:24:56 GMT",
"version": "v2"
},
{
"created": "Fri, 24 Jul 2009 03:26:09 GMT",
"version": "v3"
}
] |
2010-04-30
|
[
[
"Nagahiro",
"H.",
""
],
[
"Yamagata-Sekihara",
"J.",
""
],
[
"Oset",
"E.",
""
],
[
"Hirenzaki",
"S.",
""
],
[
"Molina",
"R.",
""
]
] |
Using recent results obtained within the hidden gauge formalism for vector mesons, in which the $f_0(1370)$ and $f_2(1270)$ resonances are dynamically generated resonances from the $\rho \rho$ interaction, we evaluate the radiative decay of these resonances into $\gamma \gamma$. We obtain results for the width in good agreement with the experimental data for the $f_2(1270)$ state and a width about a factor five smaller for the $f_0(1370)$ resonance, which would agree with preliminary results from the Belle collaboration, hinting at an order of magnitude smaller width for this resonance than for the $f_2(1270)$.
|
hep-ph/9910282
|
Hyun-Chul Kim
|
Hyun-Chul Kim, Michal Praszalowicz, and Klaus Goeke
|
Hyperon semileptonic decays and quark spin content of the proton
|
The final version accepted for publication in Phys. Rev. D. 18 pages,
RevTex is used with 4 figures included
|
Phys.Rev. D61 (2000) 114006
|
10.1103/PhysRevD.61.114006
|
PNU-NTG-04/99, RUB-TPII-15/99
|
hep-ph
| null |
We investigate the hyperon semileptonic decays and the quark spin content of
the proton $\Delta \Sigma$ taking into account flavor SU(3) symmetry breaking.
Symmetry breaking is implemented with the help of the chiral quark-soliton
model in an approach, in which the dynamical parameters are fixed by the
experimental data for six hyperon semileptonic decay constants. As a result we
predict the unmeasured decay constants, particularly for $\Xi^0 \to \Sigma^+$,
which will be soon measured and examine the effect of the SU(3) symmetry
breaking on the spin content $\Delta \Sigma $ of the proton. Unfortunately
large experimental errors of $\Xi^-$ decays propagate in our analysis making
$\Delta \Sigma$ and $\Delta s$ practically undetermined. We conclude that
statements concerning the values of these two quantities, which are based on
the exact SU(3) symmetry, are premature. We stress that the meaningful results
can be obtained only if the experimental errors for the $\Xi$ decays are
reduced.
|
[
{
"created": "Fri, 8 Oct 1999 14:00:59 GMT",
"version": "v1"
},
{
"created": "Thu, 27 Jan 2000 14:41:46 GMT",
"version": "v2"
}
] |
2009-10-31
|
[
[
"Kim",
"Hyun-Chul",
""
],
[
"Praszalowicz",
"Michal",
""
],
[
"Goeke",
"Klaus",
""
]
] |
We investigate the hyperon semileptonic decays and the quark spin content of the proton $\Delta \Sigma$ taking into account flavor SU(3) symmetry breaking. Symmetry breaking is implemented with the help of the chiral quark-soliton model in an approach, in which the dynamical parameters are fixed by the experimental data for six hyperon semileptonic decay constants. As a result we predict the unmeasured decay constants, particularly for $\Xi^0 \to \Sigma^+$, which will be soon measured and examine the effect of the SU(3) symmetry breaking on the spin content $\Delta \Sigma $ of the proton. Unfortunately large experimental errors of $\Xi^-$ decays propagate in our analysis making $\Delta \Sigma$ and $\Delta s$ practically undetermined. We conclude that statements concerning the values of these two quantities, which are based on the exact SU(3) symmetry, are premature. We stress that the meaningful results can be obtained only if the experimental errors for the $\Xi$ decays are reduced.
|
2404.01222
|
Dmitri Melikhov
|
Ilia Belov, Alexander Berezhnoy, and Dmitri Melikhov
|
Nonfactorizable charming-loop contribution to FCNC $B_s\to \gamma
l^+l^-$ decay
|
18 pages. Added Appendix D and a few references. Version to appear in
PRD. arXiv admin note: text overlap with arXiv:1712.07926, arXiv:2309.00358
| null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We present the first theoretical calculation of nonfactorizable charm-quark
loop contributions to the $B_s\to \gamma l^+l^-$ amplitude. We calculate the
relevant form factors, $H_{A,V}^{\rm NF}(k'^2,k^2)$, and provide convenient
parametrizations of our results in the form of fit functions of two variables,
$k'^2$ and $k^2$, applicable in the region below hadron resonances, $k'^2 <
M_{J/\psi}^2$ and $k^2 < M_{\phi}^2$. We report that factorizable and
nonfactorizable charm contributions to the $B_s\to\gamma l^+l^-$ amplitude have
opposite signs. To compare the charm and the top contributions, it is
convenient to express the NF charming loop contribution as a non-universal
(i.e., dependent on the reaction) $q^2$-dependent correction $\Delta^{\rm
NF}C_7(q^2)$ to the Wilson coefficient $C_7$. For the $B_s\to\gamma l^+l^-$
amplitude, the correction is found to be positive, $\Delta^{\rm NF}
C_7(q^2)/C_7 > 0$.
|
[
{
"created": "Mon, 1 Apr 2024 16:31:04 GMT",
"version": "v1"
},
{
"created": "Wed, 15 May 2024 15:50:25 GMT",
"version": "v2"
}
] |
2024-05-16
|
[
[
"Belov",
"Ilia",
""
],
[
"Berezhnoy",
"Alexander",
""
],
[
"Melikhov",
"Dmitri",
""
]
] |
We present the first theoretical calculation of nonfactorizable charm-quark loop contributions to the $B_s\to \gamma l^+l^-$ amplitude. We calculate the relevant form factors, $H_{A,V}^{\rm NF}(k'^2,k^2)$, and provide convenient parametrizations of our results in the form of fit functions of two variables, $k'^2$ and $k^2$, applicable in the region below hadron resonances, $k'^2 < M_{J/\psi}^2$ and $k^2 < M_{\phi}^2$. We report that factorizable and nonfactorizable charm contributions to the $B_s\to\gamma l^+l^-$ amplitude have opposite signs. To compare the charm and the top contributions, it is convenient to express the NF charming loop contribution as a non-universal (i.e., dependent on the reaction) $q^2$-dependent correction $\Delta^{\rm NF}C_7(q^2)$ to the Wilson coefficient $C_7$. For the $B_s\to\gamma l^+l^-$ amplitude, the correction is found to be positive, $\Delta^{\rm NF} C_7(q^2)/C_7 > 0$.
|
1402.4126
|
Yuya Yamaguchi
|
Naoyuki Haba, Kunio Kaneta, Ryo Takahashi, and Yuya Yamaguchi
|
Accurate renormalization group analyses in neutrino sector
|
20 pages, 21 figures, version accepted for publication in NPB. Typos
and all figures in Sec.3 corrected, references added, new subsection
(Sec.2.2) added
|
Nucl. Phys. B885 (2014) 180-195
|
10.1016/j.nuclphysb.2014.05.022
|
SU-HET-02-2014, IPMU14-0034, EPHOU-14-002
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate accurate renormalization group analyses in neutrino sector
between $\nu$-oscillation and seesaw energy scales. We consider decoupling
effects of top quark and Higgs boson on the renormalization group equations of
light neutrino mass matrix. Since the decoupling effects are given in the
standard model scale and independent of high energy physics, our method can
basically apply to any models beyond the standard model. We find that the
decoupling effects of Higgs boson are negligible, while those of top quark are
not. Particularly, the decoupling effects of top quark affect neutrino mass
eigenvalues, which are important for analyzing predictions such as mass squared
differences and neutrinoless double beta decay in an underlying theory existing
at high energy scale.
|
[
{
"created": "Mon, 17 Feb 2014 13:03:07 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Jul 2014 07:53:38 GMT",
"version": "v2"
}
] |
2014-07-18
|
[
[
"Haba",
"Naoyuki",
""
],
[
"Kaneta",
"Kunio",
""
],
[
"Takahashi",
"Ryo",
""
],
[
"Yamaguchi",
"Yuya",
""
]
] |
We investigate accurate renormalization group analyses in neutrino sector between $\nu$-oscillation and seesaw energy scales. We consider decoupling effects of top quark and Higgs boson on the renormalization group equations of light neutrino mass matrix. Since the decoupling effects are given in the standard model scale and independent of high energy physics, our method can basically apply to any models beyond the standard model. We find that the decoupling effects of Higgs boson are negligible, while those of top quark are not. Particularly, the decoupling effects of top quark affect neutrino mass eigenvalues, which are important for analyzing predictions such as mass squared differences and neutrinoless double beta decay in an underlying theory existing at high energy scale.
|
1803.05254
|
Xiao-Gang He
|
Jian-Yong Cen, Jung-Hsin Chen, Xiao-Gang He, Jhih-Ying Su
|
Impacts of multi-Higgs on the $\rho$ parameter, decays of a neutral
Higgs to $WW$ and $ZZ$, and a charged Higgs to $WZ$
|
13 pages. No figure. Several typos corrected
| null |
10.1142/S0217751X1850152X
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In the standard model (SM), the $\rho$ parameter is equal to 1 and the ratio
$\lambda_{WZ}$ of Higgs $\to ZZ$ and Higgs $\to WW$ is also equal to 1 at the
tree level. When going beyond the SM with more than one types of Higgs
representations these quantities may be different from the SM predictions which
can provide crucial information about new physics. There may also exist a
certain charged Higgs $h^+$ decays into a $W^+$ and a $Z$. Imposing a custodial
symmetry can force the parameter $\rho$ to be equal to 1 with certain
predictions for $\lambda_{WZ}$ and $h^+ \to W^+Z$. However, imposing $\rho =1$
without custodial symmetry may have different predictions. We show how
differences arise and how to use experimental data to obtain information about
the underlying physics in a model with the SM plus a real and a complex
$SU(2)_L$ triplets.
|
[
{
"created": "Wed, 14 Mar 2018 13:15:58 GMT",
"version": "v1"
},
{
"created": "Fri, 16 Mar 2018 09:20:30 GMT",
"version": "v2"
}
] |
2018-09-26
|
[
[
"Cen",
"Jian-Yong",
""
],
[
"Chen",
"Jung-Hsin",
""
],
[
"He",
"Xiao-Gang",
""
],
[
"Su",
"Jhih-Ying",
""
]
] |
In the standard model (SM), the $\rho$ parameter is equal to 1 and the ratio $\lambda_{WZ}$ of Higgs $\to ZZ$ and Higgs $\to WW$ is also equal to 1 at the tree level. When going beyond the SM with more than one types of Higgs representations these quantities may be different from the SM predictions which can provide crucial information about new physics. There may also exist a certain charged Higgs $h^+$ decays into a $W^+$ and a $Z$. Imposing a custodial symmetry can force the parameter $\rho$ to be equal to 1 with certain predictions for $\lambda_{WZ}$ and $h^+ \to W^+Z$. However, imposing $\rho =1$ without custodial symmetry may have different predictions. We show how differences arise and how to use experimental data to obtain information about the underlying physics in a model with the SM plus a real and a complex $SU(2)_L$ triplets.
|
2404.03720
|
Jay Desai
|
Tyler Corbett, Jay Desai, O. J. P. Eboli, M. C. Gonzalez-Garcia
|
Dimension-eight Operator Basis for Universal Standard Model Effective
Field Theory
|
35 pages
| null | null |
YITP-SB-2024-04, UWThPh 2024-7
|
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We present the basis of dimension-eight operators associated with universal
theories. We first derive a complete list of independent dimension-eight
operators formed with the Standard Model bosonic fields characteristic of such
universal new physics scenarios. Without imposing C or P symmetries the basis
contains 175 operators -- that is, the assumption of Universality reduces the
number of independent SMEFT coefficients at dimension eight from 44807 to 175.
89 of the 175 universal operators are included in the general dimension-eight
operator basis in the literature. The 86 additional operators involve higher
derivatives of the Standard Model bosonic fields and can be rotated in favor of
operators involving fermions using the Standard Model equations of motion for
the bosonic fields. By doing so we obtain the allowed fermionic operators
generated in this class of models which we map into the corresponding 86
independent combinations of operators in the dimension-eight basis of Ref.
arXiv:2005.00059
|
[
{
"created": "Thu, 4 Apr 2024 18:00:00 GMT",
"version": "v1"
}
] |
2024-04-08
|
[
[
"Corbett",
"Tyler",
""
],
[
"Desai",
"Jay",
""
],
[
"Eboli",
"O. J. P.",
""
],
[
"Gonzalez-Garcia",
"M. C.",
""
]
] |
We present the basis of dimension-eight operators associated with universal theories. We first derive a complete list of independent dimension-eight operators formed with the Standard Model bosonic fields characteristic of such universal new physics scenarios. Without imposing C or P symmetries the basis contains 175 operators -- that is, the assumption of Universality reduces the number of independent SMEFT coefficients at dimension eight from 44807 to 175. 89 of the 175 universal operators are included in the general dimension-eight operator basis in the literature. The 86 additional operators involve higher derivatives of the Standard Model bosonic fields and can be rotated in favor of operators involving fermions using the Standard Model equations of motion for the bosonic fields. By doing so we obtain the allowed fermionic operators generated in this class of models which we map into the corresponding 86 independent combinations of operators in the dimension-eight basis of Ref. arXiv:2005.00059
|
1510.02491
|
Marco Bonvini
|
Richard D. Ball, Marco Bonvini, Luca Rottoli
|
Charm in Deep-Inelastic Scattering
|
43 pages, 1 figure. Final JHEP version
| null |
10.1007/JHEP11(2015)122
|
Edinburgh 2015/06, CERN-PH-TH/2015-118, OUTP-15-25P
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We show how to extend systematically the FONLL scheme for inclusion of heavy
quark mass effects in DIS to account for the possible effects of an intrinsic
charm component in the nucleon. We show that when there is no intrinsic charm,
FONLL is equivalent to S-ACOT to any order in perturbation theory, while when
an intrinsic charm component is included FONLL is identical to ACOT, again to
all orders in perturbation theory. We discuss in detail the inclusion of top
and bottom quarks to construct a variable flavour number scheme, and give
explicit expressions for the construction of the structure functions $F^c_2$,
$F^c_L$ and $F^c_3$ to NNLO.
|
[
{
"created": "Thu, 8 Oct 2015 20:09:42 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Oct 2015 17:35:18 GMT",
"version": "v2"
},
{
"created": "Tue, 17 Nov 2015 15:19:24 GMT",
"version": "v3"
},
{
"created": "Fri, 20 Nov 2015 08:28:56 GMT",
"version": "v4"
}
] |
2015-11-23
|
[
[
"Ball",
"Richard D.",
""
],
[
"Bonvini",
"Marco",
""
],
[
"Rottoli",
"Luca",
""
]
] |
We show how to extend systematically the FONLL scheme for inclusion of heavy quark mass effects in DIS to account for the possible effects of an intrinsic charm component in the nucleon. We show that when there is no intrinsic charm, FONLL is equivalent to S-ACOT to any order in perturbation theory, while when an intrinsic charm component is included FONLL is identical to ACOT, again to all orders in perturbation theory. We discuss in detail the inclusion of top and bottom quarks to construct a variable flavour number scheme, and give explicit expressions for the construction of the structure functions $F^c_2$, $F^c_L$ and $F^c_3$ to NNLO.
|
1602.05991
|
Alejandro Gutierrez-Rodriguez
|
M Koksal, A. A. Billur and A. Gutierrez-Rodriguez
|
Bounds on the electromagnetic dipole moments through the single top
production at the CLIC
|
26 pages, 6 figures. arXiv admin note: text overlap with
arXiv:1412.2094
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We obtain bounds on the anomalous magnetic and electric dipole moments of the
$t$-quark from a future high-energy and high-luminosity linear electron
positron collider, such as the CLIC, with unpolarized and polarized electron
beams which are a powerful tool to determine new physics. We consider the
processes $\gamma e^- \to \bar t b\nu_e$ ($\gamma$ is the Compton
backscattering photon) and $e^+e^- \to e^-\gamma^* e^+ \to \bar t b\nu_e e^+$
($\gamma^*$ is the Weizsacker-Williams photon) which are one of the most
important sources of single top quark production. For the systematic
uncertainties of $\delta_{sys}=0\%,\hspace{1mm}5\%$, $b-\mbox{tagging
efficiency}=0.8$, center-of-mass energy of $\sqrt{s}=3\hspace{0.8mm}TeV$,
integrated luminosity of ${\cal L}=2\hspace{0.5mm}ab^{-1}$ and
$2\sigma\hspace{1mm}(3\sigma)$ C.L. the future $e^+e^-$ collider may put bounds
on the electromagnetic dipole moments $\hat a_V$ and $\hat a_A$ of the top
quark of the order of ${\cal O}(10^{-2}-10^{-1})$, which are highly competitive
with those recently reported in previous studies.
|
[
{
"created": "Thu, 18 Feb 2016 22:23:34 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Apr 2016 23:18:28 GMT",
"version": "v2"
},
{
"created": "Thu, 19 Jan 2017 22:08:30 GMT",
"version": "v3"
}
] |
2017-01-23
|
[
[
"Koksal",
"M",
""
],
[
"Billur",
"A. A.",
""
],
[
"Gutierrez-Rodriguez",
"A.",
""
]
] |
We obtain bounds on the anomalous magnetic and electric dipole moments of the $t$-quark from a future high-energy and high-luminosity linear electron positron collider, such as the CLIC, with unpolarized and polarized electron beams which are a powerful tool to determine new physics. We consider the processes $\gamma e^- \to \bar t b\nu_e$ ($\gamma$ is the Compton backscattering photon) and $e^+e^- \to e^-\gamma^* e^+ \to \bar t b\nu_e e^+$ ($\gamma^*$ is the Weizsacker-Williams photon) which are one of the most important sources of single top quark production. For the systematic uncertainties of $\delta_{sys}=0\%,\hspace{1mm}5\%$, $b-\mbox{tagging efficiency}=0.8$, center-of-mass energy of $\sqrt{s}=3\hspace{0.8mm}TeV$, integrated luminosity of ${\cal L}=2\hspace{0.5mm}ab^{-1}$ and $2\sigma\hspace{1mm}(3\sigma)$ C.L. the future $e^+e^-$ collider may put bounds on the electromagnetic dipole moments $\hat a_V$ and $\hat a_A$ of the top quark of the order of ${\cal O}(10^{-2}-10^{-1})$, which are highly competitive with those recently reported in previous studies.
|
1110.4871
|
Joseph Bramante
|
Joseph Bramante
|
Sterile Neutrino Production Through a Matter Effect Enhancement at Long
Baselines
|
5 pages, 3 figures; references added, published in IJMPA
|
Int. J. Mod. Phys. A 28, 1350067 (2013)
| null | null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
If sterile neutrinos have a neutral coupling to standard model fermions,
matter effect resonant transitions to sterile neutrinos and excess
neutral-current events could manifest at long baseline experiments. Assuming a
single sterile neutrino with a neutral coupling to fermionic matter, we
re-examine bounds on sterile neutrino production at long baselines from the
MINOS result $P_{\nu_{\mu} \rightarrow \nu_s} < 0.22$ (90% CL). We demonstrate
that sterile neutrinos with a neutral vector coupling to fermionic matter could
evade the MINOS limit, allowing a higher fraction of active to sterile neutrino
conversion at long baselines. Scanning the parameter space of sterile neutrino
matter effect fits of the LSND and MiniBooNe data, we show that in the case of
a vector singlet coupling of sterile neutrinos to matter, some favored
parametrizations of these fits would create neutral-current event excesses
above standard model predictions at long baseline experiments (e.g. MINOS and
OPERA).
|
[
{
"created": "Fri, 21 Oct 2011 19:03:41 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Nov 2011 18:24:20 GMT",
"version": "v2"
},
{
"created": "Sun, 13 Nov 2011 03:21:20 GMT",
"version": "v3"
},
{
"created": "Thu, 20 Dec 2012 02:28:06 GMT",
"version": "v4"
},
{
"created": "Tue, 18 Jun 2013 19:52:18 GMT",
"version": "v5"
}
] |
2013-06-19
|
[
[
"Bramante",
"Joseph",
""
]
] |
If sterile neutrinos have a neutral coupling to standard model fermions, matter effect resonant transitions to sterile neutrinos and excess neutral-current events could manifest at long baseline experiments. Assuming a single sterile neutrino with a neutral coupling to fermionic matter, we re-examine bounds on sterile neutrino production at long baselines from the MINOS result $P_{\nu_{\mu} \rightarrow \nu_s} < 0.22$ (90% CL). We demonstrate that sterile neutrinos with a neutral vector coupling to fermionic matter could evade the MINOS limit, allowing a higher fraction of active to sterile neutrino conversion at long baselines. Scanning the parameter space of sterile neutrino matter effect fits of the LSND and MiniBooNe data, we show that in the case of a vector singlet coupling of sterile neutrinos to matter, some favored parametrizations of these fits would create neutral-current event excesses above standard model predictions at long baseline experiments (e.g. MINOS and OPERA).
|
hep-ph/0503201
|
Tatsuru Kikuchi
|
Takeshi Fukuyama, Tatsuru Kikuchi, Toshiyuki Osaka
|
Non-thermal Leptogenesis and a Prediction of Inflaton Mass in a
Supersymmetric SO(10) Model
|
9 pages, 2 figures; the version to appear in JCAP
|
JCAP 0506 (2005) 005
|
10.1088/1475-7516/2005/06/005
| null |
hep-ph astro-ph
| null |
The gravitino problem gives a severe constraint on the thermal leptogenesis
scenario. This problem leads us to consider some alternatives to it if we try
to keep the gravitino mass around the weak scale $m_{3/2} \sim 100$ GeV. We
consider, in this paper, the non-thermal leptogenesis scenario in the framework
of a minimal supersymmetric SO(10) model. Even if we start with the same
minimal SO(10) model, we have different predictions for low-energy
phenomenologies dependent on the types of seesaw mechanism. This is the case
for leptogenesis: it is shown that the type-I see-saw model gives a consistent
scenario for the non-thermal leptogenesis but not for type-II. The predicted
inflaton mass needed to produce the observed baryon asymmetry of the universe
is found to be $M_I \sim 5 \times 10^{11}$ GeV for the reheating temperature
$T_R = 10^6$ GeV.
|
[
{
"created": "Mon, 21 Mar 2005 12:59:03 GMT",
"version": "v1"
},
{
"created": "Sat, 4 Jun 2005 15:12:32 GMT",
"version": "v2"
}
] |
2009-11-11
|
[
[
"Fukuyama",
"Takeshi",
""
],
[
"Kikuchi",
"Tatsuru",
""
],
[
"Osaka",
"Toshiyuki",
""
]
] |
The gravitino problem gives a severe constraint on the thermal leptogenesis scenario. This problem leads us to consider some alternatives to it if we try to keep the gravitino mass around the weak scale $m_{3/2} \sim 100$ GeV. We consider, in this paper, the non-thermal leptogenesis scenario in the framework of a minimal supersymmetric SO(10) model. Even if we start with the same minimal SO(10) model, we have different predictions for low-energy phenomenologies dependent on the types of seesaw mechanism. This is the case for leptogenesis: it is shown that the type-I see-saw model gives a consistent scenario for the non-thermal leptogenesis but not for type-II. The predicted inflaton mass needed to produce the observed baryon asymmetry of the universe is found to be $M_I \sim 5 \times 10^{11}$ GeV for the reheating temperature $T_R = 10^6$ GeV.
|
hep-ph/0001147
|
Dr. Anthony G. Williams
|
Ayse Kizilersu, Tom Sizer and Anthony G. Williams (CSSM, University of
Adelaide)
|
On conditions for the nonperturbative equivalence of ultraviolet cut-off
and dimensional regularization schemes
|
RevTeX, 29 pages, 9 figures
| null | null |
ADP-99-43/T380
|
hep-ph
| null |
We consider procedures through which an ultraviolet cut-off regularization
scheme can be modified to reproduce the same results for nonperturbative
renormalized Green's functions as obtained from a dimensional regularization
scheme. These issues are considered within the Dyson-Schwinger equation
framework, where ultraviolet cut-off regularization can lead to explicit
violations of gauge invariance. As a specific illustration, we consider the
electron self-energy in quenched QED_4 in both schemes and establish those
procedures for which the UV cut-off scheme can be expected to lead to the
dimensional regularization results. We also compare results from precise
numerical studies using the two types of regularization.
|
[
{
"created": "Mon, 17 Jan 2000 00:03:19 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Kizilersu",
"Ayse",
"",
"CSSM, University of\n Adelaide"
],
[
"Sizer",
"Tom",
"",
"CSSM, University of\n Adelaide"
],
[
"Williams",
"Anthony G.",
"",
"CSSM, University of\n Adelaide"
]
] |
We consider procedures through which an ultraviolet cut-off regularization scheme can be modified to reproduce the same results for nonperturbative renormalized Green's functions as obtained from a dimensional regularization scheme. These issues are considered within the Dyson-Schwinger equation framework, where ultraviolet cut-off regularization can lead to explicit violations of gauge invariance. As a specific illustration, we consider the electron self-energy in quenched QED_4 in both schemes and establish those procedures for which the UV cut-off scheme can be expected to lead to the dimensional regularization results. We also compare results from precise numerical studies using the two types of regularization.
|
1111.2558
|
Danny van Dyk
|
Christoph Bobeth, Gudrun Hiller, Danny van Dyk and Christian Wacker
|
The Decay B --> K l^+ l^- at Low Hadronic Recoil and Model-Independent
Delta B = 1 Constraints
|
23 pages, 11 figures; v2: Treatment of experimental uncertainties in
likelihood-function in EOS fixed and constraints from scan on C_9, C_10
updated (Figs 5, 6, 7, 8 and Eqs 3.1, 3.2, 3.5 and 3.6). Main results and
conclusions unchanged
| null |
10.1007/JHEP01(2012)107
|
DO-TH 11/23; EOS-2011-03
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the decay B --> K l^+ l^- for l = e,mu,tau with a softly recoiling
kaon, that is, for high dilepton invariant masses sqrt{q^2} of the order of the
b-quark mass. This kinematic region can be treated within an operator product
expansion and simplified using heavy quark symmetry, leading to systematic
predictions for heavy-to-light processes such as B --> K^(*) l^+ l^-. We show
that the decay rates of both B --> K^* l^+ l^- and B --> K l^+ l^- decays into
light leptons depend on a common combination of short-distance coefficients.
The corresponding CP-asymmetries are hence identical. Furthermore we present
low recoil predictions for B --> K l^+ l^- observables, including the flat term
in the angular distribution which becomes sizable for taus. We work out
model-independently the constraints on Delta B = 1 operators using the most
recent data from the experiments BaBar, Belle, CDF and LHCb. For constructive
interference with the standard model, generic new physics is pushed up to
scales above 44 TeV at 95% CL. Assuming none or small CP-violation we obtain a
lower bound on the position of the zero of the forward-backward asymmetry of
B^0 --> K^*0 l^+ l^- decays as q_0^2 > 1.7 GeV^2, which improves to q_0^2 > 2.6
GeV^2 for a standard model-like sign b --> s gamma amplitude.
|
[
{
"created": "Thu, 10 Nov 2011 18:58:07 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Nov 2011 17:09:36 GMT",
"version": "v2"
}
] |
2015-06-03
|
[
[
"Bobeth",
"Christoph",
""
],
[
"Hiller",
"Gudrun",
""
],
[
"van Dyk",
"Danny",
""
],
[
"Wacker",
"Christian",
""
]
] |
We study the decay B --> K l^+ l^- for l = e,mu,tau with a softly recoiling kaon, that is, for high dilepton invariant masses sqrt{q^2} of the order of the b-quark mass. This kinematic region can be treated within an operator product expansion and simplified using heavy quark symmetry, leading to systematic predictions for heavy-to-light processes such as B --> K^(*) l^+ l^-. We show that the decay rates of both B --> K^* l^+ l^- and B --> K l^+ l^- decays into light leptons depend on a common combination of short-distance coefficients. The corresponding CP-asymmetries are hence identical. Furthermore we present low recoil predictions for B --> K l^+ l^- observables, including the flat term in the angular distribution which becomes sizable for taus. We work out model-independently the constraints on Delta B = 1 operators using the most recent data from the experiments BaBar, Belle, CDF and LHCb. For constructive interference with the standard model, generic new physics is pushed up to scales above 44 TeV at 95% CL. Assuming none or small CP-violation we obtain a lower bound on the position of the zero of the forward-backward asymmetry of B^0 --> K^*0 l^+ l^- decays as q_0^2 > 1.7 GeV^2, which improves to q_0^2 > 2.6 GeV^2 for a standard model-like sign b --> s gamma amplitude.
|
2106.10919
|
Kei Yamamoto
|
Morimitsu Tanimoto and Kei Yamamoto
|
Electron EDM arising from modulus $\tau$ in the supersymmetric modular
invariant flavor models
|
33 pages, 8 figures, 4 tables; v3: corrections for equations,
discussion added, figures and tables changed, conclusions unchanged. arXiv
admin note: text overlap with arXiv:2105.14292
| null |
10.1007/JHEP10(2021)183
|
HUPD-2104
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The electric dipole moment (EDM) of electron is studied in the supersymmetric
$\rm A_4$ modular invariant theory of flavors with CP invariance. The CP
symmetry of the lepton sector is broken by fixing the modulus $\tau$. Lepton
mass matrices are completely consistent with observed lepton masses and mixing
angles in our model. In this framework, a fixed $\tau$ also causes the CP
violation in the soft SUSY breaking terms. The elecrton EDM arises from the CP
non-conserved soft SUSY breaking terms. The experimental upper bound of the
electron EDM excludes the SUSY mass scale below $2-6$ TeV for five cases of the
lepton mass matrices. In order to see the effect of CP phase of the modulus
$\tau$, we examine the correlation between the electron EDM and the decay rate
of the $\mu \rightarrow e \gamma$ decay, which is also predicted by the soft
SUSY breaking terms. The correlations are clearly predicted in contrast to
models of the conventional flavor symmetry. The SUSY mass scale will be
constrained by the future sensitivity of the electron EDM, $|d_e/e| \simeq
10^{-30}$. Indeed, it could probe the SUSY mass range of $10-20$ TeV in our
model. Thus, the electron EDM provides a severe test of the CP violation via
the modulus $\tau$ in the supersymmetric modular invariant theory of flavors.
|
[
{
"created": "Mon, 21 Jun 2021 08:36:52 GMT",
"version": "v1"
},
{
"created": "Sat, 26 Jun 2021 08:48:13 GMT",
"version": "v2"
},
{
"created": "Sat, 28 Aug 2021 09:40:25 GMT",
"version": "v3"
}
] |
2021-11-10
|
[
[
"Tanimoto",
"Morimitsu",
""
],
[
"Yamamoto",
"Kei",
""
]
] |
The electric dipole moment (EDM) of electron is studied in the supersymmetric $\rm A_4$ modular invariant theory of flavors with CP invariance. The CP symmetry of the lepton sector is broken by fixing the modulus $\tau$. Lepton mass matrices are completely consistent with observed lepton masses and mixing angles in our model. In this framework, a fixed $\tau$ also causes the CP violation in the soft SUSY breaking terms. The elecrton EDM arises from the CP non-conserved soft SUSY breaking terms. The experimental upper bound of the electron EDM excludes the SUSY mass scale below $2-6$ TeV for five cases of the lepton mass matrices. In order to see the effect of CP phase of the modulus $\tau$, we examine the correlation between the electron EDM and the decay rate of the $\mu \rightarrow e \gamma$ decay, which is also predicted by the soft SUSY breaking terms. The correlations are clearly predicted in contrast to models of the conventional flavor symmetry. The SUSY mass scale will be constrained by the future sensitivity of the electron EDM, $|d_e/e| \simeq 10^{-30}$. Indeed, it could probe the SUSY mass range of $10-20$ TeV in our model. Thus, the electron EDM provides a severe test of the CP violation via the modulus $\tau$ in the supersymmetric modular invariant theory of flavors.
|
1810.04391
|
Marco Antonio Bedolla M.A. Bedolla
|
M.A. Bedolla, E. Santopinto, L. X. Guti\'errez-Guerrero
|
Heavy-light mesons spectra in a contact interaction
| null | null |
10.1051/epjconf/201819200039
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present the spectrum and decay constants of heavy-light mesons in four
different channels: pseudo-scalar, vector, scalar and axial vector. We extend
the framework for our previous analysis in a unified symmetry-preserving
Schwinger-Dyson equations treatment of a vector$\times$vectord contact
interaction. Despite the simplicity of our model, the results found for the
meson masses are in good agreement experimental data and earlier model
calculations based upon Schwinger-Dyson and Bethe-Salpeter equations (BSEs)
involving sophisticated interaction kernels.
|
[
{
"created": "Wed, 10 Oct 2018 07:03:25 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Nov 2018 16:11:38 GMT",
"version": "v2"
},
{
"created": "Thu, 14 Mar 2019 11:02:33 GMT",
"version": "v3"
}
] |
2019-03-15
|
[
[
"Bedolla",
"M. A.",
""
],
[
"Santopinto",
"E.",
""
],
[
"Gutiérrez-Guerrero",
"L. X.",
""
]
] |
We present the spectrum and decay constants of heavy-light mesons in four different channels: pseudo-scalar, vector, scalar and axial vector. We extend the framework for our previous analysis in a unified symmetry-preserving Schwinger-Dyson equations treatment of a vector$\times$vectord contact interaction. Despite the simplicity of our model, the results found for the meson masses are in good agreement experimental data and earlier model calculations based upon Schwinger-Dyson and Bethe-Salpeter equations (BSEs) involving sophisticated interaction kernels.
|
1408.0184
|
Sergey Godunov
|
S.I. Godunov, M.I. Vysotsky, E.V. Zhemchugov
|
Double Higgs production at LHC, see-saw type II and Georgi-Machacek
model
|
13 pages; devoted to the anniversary of Valery Rubakov; v2: minor
improvements, references added
| null |
10.1134/S1063776115030073
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The double Higgs production in the models with isospin-triplet scalars is
studied. It is shown that in the see-saw type II model the mode with an
intermediate heavy scalar, $pp\to H+X\to 2h+X$, may have the cross section
which is compatible with that in the Standard Model. In the Georgi-Machacek
model this cross section could be much larger than in SM since the vacuum
expectation value of the triplet can be large.
|
[
{
"created": "Fri, 1 Aug 2014 14:09:40 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Sep 2014 13:35:02 GMT",
"version": "v2"
}
] |
2015-06-22
|
[
[
"Godunov",
"S. I.",
""
],
[
"Vysotsky",
"M. I.",
""
],
[
"Zhemchugov",
"E. V.",
""
]
] |
The double Higgs production in the models with isospin-triplet scalars is studied. It is shown that in the see-saw type II model the mode with an intermediate heavy scalar, $pp\to H+X\to 2h+X$, may have the cross section which is compatible with that in the Standard Model. In the Georgi-Machacek model this cross section could be much larger than in SM since the vacuum expectation value of the triplet can be large.
|
1210.2227
|
Anders Tranberg
|
Erik Alexander Andersen, Anders Tranberg
|
Four results on phi^4 oscillons in D+1 dimensions
|
12 pages, 16 figures
| null |
10.1007/JHEP12(2012)016
| null |
hep-ph hep-lat hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present four results for oscillons in classical phi^4 theory in D+1
space-time dimensions, based on numerical simulations. These include the
oscillon lifetime and the dependence on D; evidence for the uniqueness of the
oscillon; evidence for the existence of oscillons beyond D=7; and a brief study
of the spectrum of the radiation emitted from the oscillons before, during and
after its ultimate demise.
|
[
{
"created": "Mon, 8 Oct 2012 10:49:41 GMT",
"version": "v1"
}
] |
2015-06-11
|
[
[
"Andersen",
"Erik Alexander",
""
],
[
"Tranberg",
"Anders",
""
]
] |
We present four results for oscillons in classical phi^4 theory in D+1 space-time dimensions, based on numerical simulations. These include the oscillon lifetime and the dependence on D; evidence for the uniqueness of the oscillon; evidence for the existence of oscillons beyond D=7; and a brief study of the spectrum of the radiation emitted from the oscillons before, during and after its ultimate demise.
|
hep-ph/0402094
|
Matthias Neubert
|
S. W. Bosch, B. O. Lange, M. Neubert, and G. Paz (Cornell University)
|
Factorization and Shape-Function Effects in Inclusive B-Meson Decays
|
51 pages, 10 figures; minor corrections, version to appear in Nuclear
Physics B
|
Nucl.Phys. B699 (2004) 335-386
|
10.1016/j.nuclphysb.2004.07.041
|
CLNS-04/1858
|
hep-ph
| null |
Using methods of effective field theory, factorized expressions for arbitrary
B -> X_u l nu decay distributions in the shape-function region of large
hadronic energy and moderate hadronic invariant mass are derived. Large
logarithms are resummed at next-to-leading order in renormalization-group
improved perturbation theory. The operator product expansion is employed to
relate moments of the renormalized shape function with HQET parameters such as
m_b, Lambda(bar) and lambda_1 defined in a new physical subtraction scheme. An
analytic expression for the asymptotic behavior of the shape function is
obtained, which reveals that it is not positive definite. Explicit expressions
are presented for the charged-lepton energy spectrum, the hadronic invariant
mass distribution, and the spectrum in the hadronic light-cone momentum P_+ =
E_H - P_H. A new method for a precision measurement of |V_{ub}| is proposed,
which combines good theoretical control with high efficiency and a powerful
discrimination against charm background.
|
[
{
"created": "Mon, 9 Feb 2004 21:10:18 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Mar 2004 16:16:02 GMT",
"version": "v2"
},
{
"created": "Tue, 31 Aug 2004 19:55:58 GMT",
"version": "v3"
}
] |
2009-11-10
|
[
[
"Bosch",
"S. W.",
"",
"Cornell University"
],
[
"Lange",
"B. O.",
"",
"Cornell University"
],
[
"Neubert",
"M.",
"",
"Cornell University"
],
[
"Paz",
"G.",
"",
"Cornell University"
]
] |
Using methods of effective field theory, factorized expressions for arbitrary B -> X_u l nu decay distributions in the shape-function region of large hadronic energy and moderate hadronic invariant mass are derived. Large logarithms are resummed at next-to-leading order in renormalization-group improved perturbation theory. The operator product expansion is employed to relate moments of the renormalized shape function with HQET parameters such as m_b, Lambda(bar) and lambda_1 defined in a new physical subtraction scheme. An analytic expression for the asymptotic behavior of the shape function is obtained, which reveals that it is not positive definite. Explicit expressions are presented for the charged-lepton energy spectrum, the hadronic invariant mass distribution, and the spectrum in the hadronic light-cone momentum P_+ = E_H - P_H. A new method for a precision measurement of |V_{ub}| is proposed, which combines good theoretical control with high efficiency and a powerful discrimination against charm background.
|
2308.11879
|
Wei-Hong Liang
|
Hai-Peng Li, Gong-Jie Zhang, Wei-Hong Liang, E. Oset
|
Theoretical interpretation of the $\Xi(1620)$ and $\Xi(1690)$ resonances
seen in $\Xi_c^+ \to \Xi^- \pi^+ \pi^+$ decay
|
15 pages, 8 figures, 2 tables; v2: discussion added, references
added, version to appear in Eur.Phys.J.C
| null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We study the Belle reaction $\Xi_c^+ \to \Xi^- \pi^+ \pi^+$ looking at the
mass distribution of $\pi^+ \Xi$, where clear signals for the $\Xi(1620)$ and
$\Xi(1690)$ resonances are seen. These two resonances are generated dynamically
from the interaction in coupled channels of $\pi \Xi, \bar K \Lambda, \bar K
\Sigma$ and $\eta \Xi$ within the chiral unitary approach. Yet, the weak decay
process at the quark level, together with the hadronization to produce pairs of
mesons, does not produce the $\pi \pi \Xi$ final state. In order to produce
this state one must make transitions from the $\bar K \Lambda, \bar K \Sigma$
and $\eta \Xi$ components to $\pi \Xi$, and this interaction is what produces
the resonances. So, the reaction offers a good test for the molecular picture
of these resonances. Adding the contribution of the $\Xi^*(1530)$ and some
background we are able to get a good reproduction of the mass distribution
showing the signatures of the two resonances as found in the experiment.
|
[
{
"created": "Wed, 23 Aug 2023 02:54:50 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Oct 2023 14:58:06 GMT",
"version": "v2"
}
] |
2023-10-20
|
[
[
"Li",
"Hai-Peng",
""
],
[
"Zhang",
"Gong-Jie",
""
],
[
"Liang",
"Wei-Hong",
""
],
[
"Oset",
"E.",
""
]
] |
We study the Belle reaction $\Xi_c^+ \to \Xi^- \pi^+ \pi^+$ looking at the mass distribution of $\pi^+ \Xi$, where clear signals for the $\Xi(1620)$ and $\Xi(1690)$ resonances are seen. These two resonances are generated dynamically from the interaction in coupled channels of $\pi \Xi, \bar K \Lambda, \bar K \Sigma$ and $\eta \Xi$ within the chiral unitary approach. Yet, the weak decay process at the quark level, together with the hadronization to produce pairs of mesons, does not produce the $\pi \pi \Xi$ final state. In order to produce this state one must make transitions from the $\bar K \Lambda, \bar K \Sigma$ and $\eta \Xi$ components to $\pi \Xi$, and this interaction is what produces the resonances. So, the reaction offers a good test for the molecular picture of these resonances. Adding the contribution of the $\Xi^*(1530)$ and some background we are able to get a good reproduction of the mass distribution showing the signatures of the two resonances as found in the experiment.
|
2302.07665
|
Varvara Batozskaya
|
Varvara Batozskaya (1 and 2), Andrzej Kupsc (3 and 2), Nora Salone
(2), Jakub Wiechnik (2 and 4) ((1) IHEP Beijing, (2) NCBJ Warsaw, (3) Uppsala
University, (4) Warsaw University)
|
Semileptonic decays of spin-entangled baryon-antibaryon pairs
|
37 pages, 4 figures, 4 tables
| null |
10.1103/PhysRevD.108.016011
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
A modular representation for the semileptonic decays of baryons originating
from spin polarized and correlated baryon-antibaryon pairs is derived. The
complete spin information of the decaying baryon is propagated to the daughter
baryon via a real-valued matrix. It allows to obtain joint differential
distributions in sequential processes involving the semileptonic decay in a
straightforward way. The formalism is suitable for extraction of the
semileptonic formfactors in experiments where strange-baryon-antibaryon pairs
are produced in electron-positron annihilation or in charmonia decays. We give
examples such as the complete angular distributions in the $e^+e^-\to
\Lambda\bar\Lambda$ process, where $\Lambda\to pe^-\bar{\nu}_e$ and
$\bar\Lambda\to\bar{p}\pi^+$. The formalism can also be used to describe the
distributions in semileptonic decays of charm and bottom baryons. Using the
same principles, the modules to describe electromagnetic and neutral current
weak baryon decay processes involving a charged lepton-antilepton pair can be
obtained. As an example, we provide the decay matrix for the Dalitz transition
between two spin-1/2 baryons.
|
[
{
"created": "Wed, 15 Feb 2023 13:55:30 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Jul 2023 02:39:15 GMT",
"version": "v2"
},
{
"created": "Fri, 28 Jul 2023 12:36:45 GMT",
"version": "v3"
}
] |
2023-07-31
|
[
[
"Batozskaya",
"Varvara",
"",
"1 and 2"
],
[
"Kupsc",
"Andrzej",
"",
"3 and 2"
],
[
"Salone",
"Nora",
"",
"2 and 4"
],
[
"Wiechnik",
"Jakub",
"",
"2 and 4"
]
] |
A modular representation for the semileptonic decays of baryons originating from spin polarized and correlated baryon-antibaryon pairs is derived. The complete spin information of the decaying baryon is propagated to the daughter baryon via a real-valued matrix. It allows to obtain joint differential distributions in sequential processes involving the semileptonic decay in a straightforward way. The formalism is suitable for extraction of the semileptonic formfactors in experiments where strange-baryon-antibaryon pairs are produced in electron-positron annihilation or in charmonia decays. We give examples such as the complete angular distributions in the $e^+e^-\to \Lambda\bar\Lambda$ process, where $\Lambda\to pe^-\bar{\nu}_e$ and $\bar\Lambda\to\bar{p}\pi^+$. The formalism can also be used to describe the distributions in semileptonic decays of charm and bottom baryons. Using the same principles, the modules to describe electromagnetic and neutral current weak baryon decay processes involving a charged lepton-antilepton pair can be obtained. As an example, we provide the decay matrix for the Dalitz transition between two spin-1/2 baryons.
|
hep-ph/9806339
|
Per Osland
|
P. Osland (Bergen, CERN) and G. Vigdel (Bergen)
|
Solar-neutrino oscillations and third-flavour admixture
|
11 pages, LaTeX, including 2 figures, uses epsf. CERN preprint number
changed
|
Phys.Lett. B438 (1998) 129-135
|
10.1016/S0370-2693(98)00973-3
|
CERN-TH/98-200
|
hep-ph
| null |
With one \Delta m^2 of the appropriate order of magnitude to solve the
atmospheric neutrino problem, we study the resulting three-generation
vacuum-oscillation fit to the solar neutrino flux. An explanation of the
atmospheric neutrino composition in terms of pure \nu_\mu \to \nu_\tau
oscillations is easily compatible with the well-known two-flavour oscillation
solution for solar neutrinos. The allowed parameter region in the
\sin^2(2\theta_{12})--\Delta m^2 plane changes little with increasing values of
the mixing element U_{e3}, provided this is less than about 0.4. We find that
the threefold maximal mixing is disfavoured.
|
[
{
"created": "Wed, 10 Jun 1998 14:28:02 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Jun 1998 18:22:56 GMT",
"version": "v2"
}
] |
2009-10-31
|
[
[
"Osland",
"P.",
"",
"Bergen, CERN"
],
[
"Vigdel",
"G.",
"",
"Bergen"
]
] |
With one \Delta m^2 of the appropriate order of magnitude to solve the atmospheric neutrino problem, we study the resulting three-generation vacuum-oscillation fit to the solar neutrino flux. An explanation of the atmospheric neutrino composition in terms of pure \nu_\mu \to \nu_\tau oscillations is easily compatible with the well-known two-flavour oscillation solution for solar neutrinos. The allowed parameter region in the \sin^2(2\theta_{12})--\Delta m^2 plane changes little with increasing values of the mixing element U_{e3}, provided this is less than about 0.4. We find that the threefold maximal mixing is disfavoured.
|
hep-ph/9304318
|
Ez
|
Frank Wilczek
|
Beyond the Standard Model
|
20 pages, 3 figures available upon request, IAS-HEP 92/23
| null |
10.1111/j.1749-6632.1993.tb43889.x
| null |
hep-ph
| null |
The standard model of particle physics is marvelously successful. However, it
is obviously not a complete or final theory. I shall argue here that the
structure of the standard model gives some quite concrete, compelling hints
regarding what lies beyond.
|
[
{
"created": "Fri, 30 Apr 1993 12:27:56 GMT",
"version": "v1"
}
] |
2009-10-22
|
[
[
"Wilczek",
"Frank",
""
]
] |
The standard model of particle physics is marvelously successful. However, it is obviously not a complete or final theory. I shall argue here that the structure of the standard model gives some quite concrete, compelling hints regarding what lies beyond.
|
2407.00874
|
Rong Wang
|
Xu-Rong Chen, Xiong-Hong He, Qiang Hu, De-Xu Lin, Yang Liu, Hao Qiu,
Xu Sun, Ye Tian, Rong Wang, Hong-Lin Zhang, Ya-Peng Zhang, Cheng-Xin Zhao
|
A plan for a super $\eta$ factory at Huizhou accelerator complex
|
19 pages, 9 figures
| null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by-nc-sa/4.0/
|
As a Goldstone boson with zero quantum number and zero SM charge, the decays
of long-lived $\eta$ ($\eta^{\prime}$) meson provide a unique window to search
new physics beyond the standard model and new sources of CP violation, to test
the low-energy QCD theory, and to measure the fundamental parameters of light
quarks. For such goals in the physics frontiers we discuss a plan of building a
super $\eta$ factory at HIAF high-energy terminal or at CiADS after upgrade.
The high-intensity proton beam at HIAF provides a great opportunity of
producing a huge number of $\eta$ samples of more than $10^{13}$ events per
year, with multiple layers of thin targets of light nucleus. The physics goals,
the first-version conceptual design of the spectrometer, and the preliminary
simulation results are present.
|
[
{
"created": "Mon, 1 Jul 2024 00:46:38 GMT",
"version": "v1"
}
] |
2024-07-02
|
[
[
"Chen",
"Xu-Rong",
""
],
[
"He",
"Xiong-Hong",
""
],
[
"Hu",
"Qiang",
""
],
[
"Lin",
"De-Xu",
""
],
[
"Liu",
"Yang",
""
],
[
"Qiu",
"Hao",
""
],
[
"Sun",
"Xu",
""
],
[
"Tian",
"Ye",
""
],
[
"Wang",
"Rong",
""
],
[
"Zhang",
"Hong-Lin",
""
],
[
"Zhang",
"Ya-Peng",
""
],
[
"Zhao",
"Cheng-Xin",
""
]
] |
As a Goldstone boson with zero quantum number and zero SM charge, the decays of long-lived $\eta$ ($\eta^{\prime}$) meson provide a unique window to search new physics beyond the standard model and new sources of CP violation, to test the low-energy QCD theory, and to measure the fundamental parameters of light quarks. For such goals in the physics frontiers we discuss a plan of building a super $\eta$ factory at HIAF high-energy terminal or at CiADS after upgrade. The high-intensity proton beam at HIAF provides a great opportunity of producing a huge number of $\eta$ samples of more than $10^{13}$ events per year, with multiple layers of thin targets of light nucleus. The physics goals, the first-version conceptual design of the spectrometer, and the preliminary simulation results are present.
|
2308.16390
|
Shao-Ping Li
|
Shinya Kanemura, Shao-Ping Li
|
Dark phase transition from WIMP: complementary tests from gravitational
waves and colliders
|
33 pages, 5 figures and 1 table. Version accepted by JCAP
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A dark sector is an interesting place where a strong first-order phase
transition, observable gravitational waves and/or a dark matter candidate could
arise. However, the experimental tests for such a dark sector could be
ambiguous due to the dark content, largely unconstrained parameter space and
the connection to the visible world. We consider a minimal dark scalar-vector
boson plasma to realize the three mentioned phenomena, with a unique connection
to the Standard Model via the Higgs portal coupling. We discuss the important
features of the Higgs portal in such a minimal dark sector, namely the dark
thermalization, collider tests, and direct detection of dark matter. We perform
numerical analyses of the dark phase transition associated with stochastic
gravitational waves and dark matter, discussing the complementarity of collider
detection, dark matter direct detection and space-based/terrestrial
interferometers as a promising avenue to hear and see the minimal dark sector.
|
[
{
"created": "Thu, 31 Aug 2023 01:44:40 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Feb 2024 11:05:18 GMT",
"version": "v2"
}
] |
2024-02-21
|
[
[
"Kanemura",
"Shinya",
""
],
[
"Li",
"Shao-Ping",
""
]
] |
A dark sector is an interesting place where a strong first-order phase transition, observable gravitational waves and/or a dark matter candidate could arise. However, the experimental tests for such a dark sector could be ambiguous due to the dark content, largely unconstrained parameter space and the connection to the visible world. We consider a minimal dark scalar-vector boson plasma to realize the three mentioned phenomena, with a unique connection to the Standard Model via the Higgs portal coupling. We discuss the important features of the Higgs portal in such a minimal dark sector, namely the dark thermalization, collider tests, and direct detection of dark matter. We perform numerical analyses of the dark phase transition associated with stochastic gravitational waves and dark matter, discussing the complementarity of collider detection, dark matter direct detection and space-based/terrestrial interferometers as a promising avenue to hear and see the minimal dark sector.
|
hep-ph/0107143
|
Sergei Khlebnikov
|
F. Finelli and S. Khlebnikov
|
Metric perturbations at reheating: the use of spherical symmetry
|
18 pages, revtex, 2 figures
|
Phys.Rev.D65:043505,2002
|
10.1103/PhysRevD.65.043505
|
PURD-TH-01-02
|
hep-ph astro-ph gr-qc
| null |
We consider decay of the inflaton with a quartic potential coupled to other
fields, including gravity, but restricted to spherical symmetry. We describe
analytically an early, quasilinear regime, during which inflaton fluctuations
and the metric functions are driven by nonlinear effects of the decay products.
We present a detailed study of the leading nonlinear effects in this regime.
Results of the quasilinear approximation, in its domain of applicability, are
found to be consistent with those of fully nonlinear lattice studies. We
discuss how these results may be promoted to the full three dimensions.
|
[
{
"created": "Thu, 12 Jul 2001 22:33:17 GMT",
"version": "v1"
}
] |
2010-11-19
|
[
[
"Finelli",
"F.",
""
],
[
"Khlebnikov",
"S.",
""
]
] |
We consider decay of the inflaton with a quartic potential coupled to other fields, including gravity, but restricted to spherical symmetry. We describe analytically an early, quasilinear regime, during which inflaton fluctuations and the metric functions are driven by nonlinear effects of the decay products. We present a detailed study of the leading nonlinear effects in this regime. Results of the quasilinear approximation, in its domain of applicability, are found to be consistent with those of fully nonlinear lattice studies. We discuss how these results may be promoted to the full three dimensions.
|
hep-ph/0403137
|
D. J. Miller
|
D.J. Miller and S. Moretti
|
An Interesting NMSSM Scenario at the LHC and LC
|
11 pages, 5 figures, Contribution to the LHC / LC Study Group
| null | null |
Edinburgh 2004/06, SHEP-04-08
|
hep-ph
| null |
The Next-to-Minimal Supersymmetric Standard Model NMSSM provides an
attractive extension to the minimal supersymmetric model by including an extra
Higgs singlet superfield. This extension allows one to link the Higgs-higgsino
mass parameter to a vacuum expectation value of the new scalar field, thus
providing a solution to the mu-problem of the MSSM. It this report, presented
within the context of the LHC / LC Study Group, we examine a particularly
interesting NMSSM scenario where the extra Higgs scalar is rather light. We
determine LHC production cross-sections and branching ratios for the lightest
scalar and find that it will be difficult to observe at the LHC. However, we
show that this lightest scalar can instead be observed at an electron-positron
Linear Collider for all but a small window of parameter space.
|
[
{
"created": "Fri, 12 Mar 2004 15:18:30 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Miller",
"D. J.",
""
],
[
"Moretti",
"S.",
""
]
] |
The Next-to-Minimal Supersymmetric Standard Model NMSSM provides an attractive extension to the minimal supersymmetric model by including an extra Higgs singlet superfield. This extension allows one to link the Higgs-higgsino mass parameter to a vacuum expectation value of the new scalar field, thus providing a solution to the mu-problem of the MSSM. It this report, presented within the context of the LHC / LC Study Group, we examine a particularly interesting NMSSM scenario where the extra Higgs scalar is rather light. We determine LHC production cross-sections and branching ratios for the lightest scalar and find that it will be difficult to observe at the LHC. However, we show that this lightest scalar can instead be observed at an electron-positron Linear Collider for all but a small window of parameter space.
|
1206.2845
|
Maxim Chernodub
|
M. N. Chernodub, Jos Van Doorsselaere, Henri Verschelde
|
Spontaneous electromagnetic superconductivity and superfluidity of
QCDxQED vacuum in strong magnetic field
|
6 pages, 2 figures. Talk given at Sixth International Conference on
Quarks and Nuclear Physics QNP2012, April 16-20, 2012, Ecole Polytechnique,
Palaiseau, France
|
Proceedings of Science QNP2012:109, 2012
| null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
It was recently shown that the vacuum in the background of a strong enough
magnetic field may become an electromagnetic superconductor due to interplay
between strong and electromagnetic forces. The superconducting ground state of
the QCDxQED sector of the vacuum is associated with magnetic-field-assisted
emergence of quark-antiquark condensates which carry quantum numbers of charged
rho mesons (i.e., of electrically charged vector particles made of lightest, u
and d, quarks and antiquarks). Here we demonstrate that this exotic
electromagnetic superconductivity of vacuum is also accompanied by even more
exotic superfluidity of the neutral rho mesons. The superfluid component --
despite being electrically neutral -- turns out to be sensitive to an external
electric field as the superfluid may ballistically be accelerated by a test
background electric field along the magnetic-field axis. In the ground state
both superconducting and superfluid components are inhomogeneous periodic
functions of the transversal (with respect to the axis of the magnetic field)
spatial coordinates. The superconducting part of the ground state resembles an
Abrikosov ground state in a type-II superconductor: the superconducting
condensate organizes itself in periodic structure which possesses the symmetry
of an equilateral triangular lattice. Each elementary lattice cell contains a
stringlike topological defect (superconductor vortex) in the charged rho
condensates as well as three superfluid vortices and three superfluid
antivortices made of the neutral rho condensate. The superposition of the
superconductor and superfluid vortex lattices has a complicated "kaleidoscopic"
pattern.
|
[
{
"created": "Wed, 13 Jun 2012 15:40:41 GMT",
"version": "v1"
}
] |
2012-12-04
|
[
[
"Chernodub",
"M. N.",
""
],
[
"Van Doorsselaere",
"Jos",
""
],
[
"Verschelde",
"Henri",
""
]
] |
It was recently shown that the vacuum in the background of a strong enough magnetic field may become an electromagnetic superconductor due to interplay between strong and electromagnetic forces. The superconducting ground state of the QCDxQED sector of the vacuum is associated with magnetic-field-assisted emergence of quark-antiquark condensates which carry quantum numbers of charged rho mesons (i.e., of electrically charged vector particles made of lightest, u and d, quarks and antiquarks). Here we demonstrate that this exotic electromagnetic superconductivity of vacuum is also accompanied by even more exotic superfluidity of the neutral rho mesons. The superfluid component -- despite being electrically neutral -- turns out to be sensitive to an external electric field as the superfluid may ballistically be accelerated by a test background electric field along the magnetic-field axis. In the ground state both superconducting and superfluid components are inhomogeneous periodic functions of the transversal (with respect to the axis of the magnetic field) spatial coordinates. The superconducting part of the ground state resembles an Abrikosov ground state in a type-II superconductor: the superconducting condensate organizes itself in periodic structure which possesses the symmetry of an equilateral triangular lattice. Each elementary lattice cell contains a stringlike topological defect (superconductor vortex) in the charged rho condensates as well as three superfluid vortices and three superfluid antivortices made of the neutral rho condensate. The superposition of the superconductor and superfluid vortex lattices has a complicated "kaleidoscopic" pattern.
|
hep-ph/0512012
|
Jurgen Reuter
|
J. Reuter, K. Hagiwara, W. Kilian, F. Krauss, T. Ohl, T. Plehn, D.
Rainwater, S. Schumann
|
Next Generation Multi-particle event generators for the MSSM
|
3 pages, talk given by J. Reuter at the Snowmass ALCPG workshop,
August 14-27, 2005, ALCPG0323; v2: updated references
|
ECONF C0508141:ALCPG0323,2005
| null |
DESY 05-196
|
hep-ph
| null |
We present a next generation of multi-particle Monte Carlo (MC) Event
generators for LHC and ILC for the MSSM, namely the three program packages
Madgraph/MadEvent, WHiZard/O'Mega and Sherpa/Amegic++. The interesting but
difficult phenomenology of supersymmetric models at the upcoming colliders
demands a corresponding complexity and maturity from simulation tools. This
includes multi-particle final states, reducible and irreducible backgrounds,
spin correlations, real emission of photons and gluons, etc., which are
incorporated in the programs presented here. The framework of a model with such
a huge particle content and as complicated as the MSSM makes strenuous tests
and comparison of codes inevitable. Various tests show agreement among the
three different programs; the tables of cross sections produced in these tests
may serve as a future reference for other codes. Furthermore, first MSSM
physics analyses performed with these programs are presented here.
|
[
{
"created": "Thu, 1 Dec 2005 14:46:15 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Feb 2006 15:33:03 GMT",
"version": "v2"
}
] |
2014-11-18
|
[
[
"Reuter",
"J.",
""
],
[
"Hagiwara",
"K.",
""
],
[
"Kilian",
"W.",
""
],
[
"Krauss",
"F.",
""
],
[
"Ohl",
"T.",
""
],
[
"Plehn",
"T.",
""
],
[
"Rainwater",
"D.",
""
],
[
"Schumann",
"S.",
""
]
] |
We present a next generation of multi-particle Monte Carlo (MC) Event generators for LHC and ILC for the MSSM, namely the three program packages Madgraph/MadEvent, WHiZard/O'Mega and Sherpa/Amegic++. The interesting but difficult phenomenology of supersymmetric models at the upcoming colliders demands a corresponding complexity and maturity from simulation tools. This includes multi-particle final states, reducible and irreducible backgrounds, spin correlations, real emission of photons and gluons, etc., which are incorporated in the programs presented here. The framework of a model with such a huge particle content and as complicated as the MSSM makes strenuous tests and comparison of codes inevitable. Various tests show agreement among the three different programs; the tables of cross sections produced in these tests may serve as a future reference for other codes. Furthermore, first MSSM physics analyses performed with these programs are presented here.
|
hep-ph/9411332
| null |
G.Montagna, O.Nicrosini, G.Passarino, F.Piccinini
|
Semi-analytical and Monte Carlo results for the production of four
fermions in $e^+ e^-$ collisions
|
10 pages, 9 figures available via anonymous ftp at
ftp://cobra1.pv.infn.it/pub/4f/figww.ps . A citation has been corrected
|
Phys.Lett. B348 (1995) 178-184
|
10.1016/0370-2693(95)00098-6
|
CERN-TH.7497/94
|
hep-ph
| null |
In view of the forthcoming experiments at high energy $e^+ e^-$ colliders,
LEP2 and beyond, the process $e^+ e^- \to W^+ W^- \to 4f$ has been investigated
for {\it off-shell} $W$'s. After deriving the matrix element for the process
within the helicity amplitude formalism, QED radiative corrections to the
initial state leptons have been included at the leading logarithmic level in
the framework of the electron structure functions. Cross sections and
distributions are computed by means of both a semi-analytical and a Monte Carlo
code, allowing for several cuts of experimental interest. A Monte Carlo event
generator has also been built, for simulation purposes. Some illustrative
numerical results are included and shortly described.
|
[
{
"created": "Fri, 18 Nov 1994 10:12:57 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Nov 1994 10:55:45 GMT",
"version": "v2"
}
] |
2009-10-28
|
[
[
"Montagna",
"G.",
""
],
[
"Nicrosini",
"O.",
""
],
[
"Passarino",
"G.",
""
],
[
"Piccinini",
"F.",
""
]
] |
In view of the forthcoming experiments at high energy $e^+ e^-$ colliders, LEP2 and beyond, the process $e^+ e^- \to W^+ W^- \to 4f$ has been investigated for {\it off-shell} $W$'s. After deriving the matrix element for the process within the helicity amplitude formalism, QED radiative corrections to the initial state leptons have been included at the leading logarithmic level in the framework of the electron structure functions. Cross sections and distributions are computed by means of both a semi-analytical and a Monte Carlo code, allowing for several cuts of experimental interest. A Monte Carlo event generator has also been built, for simulation purposes. Some illustrative numerical results are included and shortly described.
|
hep-ph/9812485
| null |
A. V. Gulov and V. V. Skalozub
|
Renormalization group relations and searching for abelian Z' Boson in
the four-fermionic processes
|
18 pages, 4 figures. The title is changed to be more precise. The
text of the paper is rewritten
| null | null | null |
hep-ph
| null |
The method of searching for signals of heavy virtual particles is developed.
It is based on a renormalization group equation for the low energy effective
Lagrangian and the decoupling theorem. As an application, the model independent
search for Abelian Z' boson in four-fermion processes is analyzed. The basic
one-loop renormalization group relation for the parameters of the effective
Lagrangian is derived which gives possibility to reduce the problem to the
scattering of the Standard Model particles in the ``external field''
substituting heavy virtual Z' state. From the set of derived relations it is
determined that the absolute value of the Z' coupling to the axial currents has
to be the same for all fermions and is strongly correlated to the Z' coupling
to the scalar fields. The corresponding dependences between the parameters of
the effective Lagrangians are derived.
|
[
{
"created": "Wed, 23 Dec 1998 12:05:51 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Mar 1999 09:43:08 GMT",
"version": "v2"
},
{
"created": "Tue, 18 Jan 2000 08:43:48 GMT",
"version": "v3"
}
] |
2007-05-23
|
[
[
"Gulov",
"A. V.",
""
],
[
"Skalozub",
"V. V.",
""
]
] |
The method of searching for signals of heavy virtual particles is developed. It is based on a renormalization group equation for the low energy effective Lagrangian and the decoupling theorem. As an application, the model independent search for Abelian Z' boson in four-fermion processes is analyzed. The basic one-loop renormalization group relation for the parameters of the effective Lagrangian is derived which gives possibility to reduce the problem to the scattering of the Standard Model particles in the ``external field'' substituting heavy virtual Z' state. From the set of derived relations it is determined that the absolute value of the Z' coupling to the axial currents has to be the same for all fermions and is strongly correlated to the Z' coupling to the scalar fields. The corresponding dependences between the parameters of the effective Lagrangians are derived.
|
hep-ph/0005220
|
Valerie Nowak
|
Stepehn L. Adler
|
Remarks on a Proposed Super-Kamiokande Test for Quantum Gravity Induced
Decoherence Effects
|
10 pages, plain Tex, no figures
|
Phys.Rev. D62 (2000) 117901
|
10.1103/PhysRevD.62.117901
|
IASSNS-HEP-00/43
|
hep-ph quant-ph
| null |
Lisi, Marrone, and Montanino have recently proposed a test for quantum
gravity induced decoherence effects in neutrino oscillations observed at
Super-Kamiokande. We comment here that their equations have the same
qualitative form as the energy conserving objective state vector reduction
equations discussed by a number of authors. However, using the Planckian
parameter value proposed to explain state vector reduction leads to a neutrino
oscillation effect many orders of magnitude smaller than would be detectable at
Super-Kamiokande. Similar estimates hold for the Ghirardi, Rimini, and Weber
spontaneous localization approach to state vector reduction, and our remarks
are relevant as well to proposed $K$ meson and $B$ meson tests of gravity
induced decoherence.
|
[
{
"created": "Mon, 22 May 2000 14:14:22 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Jun 2000 17:15:34 GMT",
"version": "v2"
}
] |
2009-10-31
|
[
[
"Adler",
"Stepehn L.",
""
]
] |
Lisi, Marrone, and Montanino have recently proposed a test for quantum gravity induced decoherence effects in neutrino oscillations observed at Super-Kamiokande. We comment here that their equations have the same qualitative form as the energy conserving objective state vector reduction equations discussed by a number of authors. However, using the Planckian parameter value proposed to explain state vector reduction leads to a neutrino oscillation effect many orders of magnitude smaller than would be detectable at Super-Kamiokande. Similar estimates hold for the Ghirardi, Rimini, and Weber spontaneous localization approach to state vector reduction, and our remarks are relevant as well to proposed $K$ meson and $B$ meson tests of gravity induced decoherence.
|
2211.09918
|
George Wojcik
|
George N. Wojcik, Lisa L. Everett, Shu Tian Eu, and Ricardo Ximenes
|
Portal Matter, Kinetic Mixing, and Muon $g-2$
|
6 pages plus references, 2 figures, v4: References added, some
discussion added, version accepted by PLB
| null |
10.1016/j.physletb.2023.137931
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We present a minimal construction using leptonic portal matter that addresses
the muon $g-2$ anomaly. While the chiral enhancement mechanism is reminiscent
of that of fermiophobic $Z'$ gauge models, the parameter space motivated by the
kinetic mixing/vector portal dark matter model paradigm is vastly different and
can be readily explored in current and forthcoming experiments.
|
[
{
"created": "Thu, 17 Nov 2022 22:30:13 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Dec 2022 21:03:41 GMT",
"version": "v2"
},
{
"created": "Thu, 2 Mar 2023 18:23:43 GMT",
"version": "v3"
},
{
"created": "Fri, 28 Apr 2023 00:04:04 GMT",
"version": "v4"
}
] |
2023-05-17
|
[
[
"Wojcik",
"George N.",
""
],
[
"Everett",
"Lisa L.",
""
],
[
"Eu",
"Shu Tian",
""
],
[
"Ximenes",
"Ricardo",
""
]
] |
We present a minimal construction using leptonic portal matter that addresses the muon $g-2$ anomaly. While the chiral enhancement mechanism is reminiscent of that of fermiophobic $Z'$ gauge models, the parameter space motivated by the kinetic mixing/vector portal dark matter model paradigm is vastly different and can be readily explored in current and forthcoming experiments.
|
1504.04270
|
Neda Sadooghi
|
N. Sadooghi and F. Taghinavaz
|
On the contribution of plasminos to the shear viscosity of a hot and
dense Yukawa-Fermi gas
|
8 pages, 7 figures, Poster presented by F. Taghinavaz at "XIth Quark
Confinement and the Hadron Spectrum", Saint-Petersburg, Russia, 8-12
September 2014
|
AIP Conf. Proc. 1701, 100019 (2016)
|
10.1063/1.4938728
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Using the standard Green-Kubo formalism, we determine the shear viscosity
$\eta$ of a hot and dense Yukawa-Fermi gas. In particular, we study the effect
of particle and plasmino excitations on thermal properties of the fermionic
part of the shear viscosity, and explore the effects of thermal corrections to
particle masses on bosonic and fermionic shear viscosities, $\eta_b$ and
$\eta_f$. It turns out that the effects of plasminos on $\eta_f$ become
negligible with increasing (decreasing) temperature (chemical potential).
|
[
{
"created": "Thu, 16 Apr 2015 15:14:15 GMT",
"version": "v1"
}
] |
2016-02-01
|
[
[
"Sadooghi",
"N.",
""
],
[
"Taghinavaz",
"F.",
""
]
] |
Using the standard Green-Kubo formalism, we determine the shear viscosity $\eta$ of a hot and dense Yukawa-Fermi gas. In particular, we study the effect of particle and plasmino excitations on thermal properties of the fermionic part of the shear viscosity, and explore the effects of thermal corrections to particle masses on bosonic and fermionic shear viscosities, $\eta_b$ and $\eta_f$. It turns out that the effects of plasminos on $\eta_f$ become negligible with increasing (decreasing) temperature (chemical potential).
|
hep-ph/0210268
|
Jose Illana
|
Jose I. Illana
|
Lepton Flavour Violating Z Decays in the MSSM
|
5 pages, 3 figures. Talk presented at the 6th International Symposium
on Radiative Corrections RADCOR 2002, and the 6th Zeuthen Workshop on
Elementary Particle Theory, Loops and Legs in Quantum Field Theory, Kloster
Banz, Germany, 8-13 September, 2002. To appear in the proceedings
|
Nucl.Phys.Proc.Suppl.116:321-325,2003
|
10.1016/S0920-5632(03)80192-5
| null |
hep-ph
| null |
The possibility to observe lepton flavour violating Z decays in the GigaZ
option of DESY's TESLA project consistently with present bounds from other
processes is analyzed in the context of the minimal supersymmetric standard
model. In particular, constraints on the slepton mass matrices from radiative
lepton decays are updated and taken into account. Their correlation to the
present measurement of the muon anomalous dipole moment is briefly discussed.
|
[
{
"created": "Fri, 18 Oct 2002 19:08:12 GMT",
"version": "v1"
}
] |
2009-11-07
|
[
[
"Illana",
"Jose I.",
""
]
] |
The possibility to observe lepton flavour violating Z decays in the GigaZ option of DESY's TESLA project consistently with present bounds from other processes is analyzed in the context of the minimal supersymmetric standard model. In particular, constraints on the slepton mass matrices from radiative lepton decays are updated and taken into account. Their correlation to the present measurement of the muon anomalous dipole moment is briefly discussed.
|
2110.15177
|
Jonathan Kriewald
|
J. Kriewald, A. Abada, A. M. Teixeira
|
The role of leptonic CPV phases in cLFV observables
|
Contribution to the TAUP 2021 conference proceedings and to the
NuFact 2021 conference proceedings, based on arXiv:2107.06313, 5 pages, 2
figures
| null |
10.1088/1742-6596/2156/1/012154
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
In models where the Standard Model is extended by Majorana fermions,
interference effects due to the presence of CP violating phases have been shown
to play a crucial role in lepton number violating processes. However, important
effects can also arise in lepton number conserving, but charged lepton flavour
violating (cLFV) transitions and decays. Here we show that the presence of CP
violating (Dirac and Majorana) phases can have a striking impact for the
predicted rates of cLFV observables. We explore the interference effects in
several cLFV observables, carrying for the first time a thorough analysis of
the different observables and the implications for future observation. We
discuss how the presence of leptonic CP violating phases might lead to a loss
of correlation between observables (typically present in simple SM extensions
via heavy sterile fermions), or even to the suppression of certain channels;
these effects can be interpreted as suggestive of non-vanishing phases.
|
[
{
"created": "Thu, 28 Oct 2021 14:54:23 GMT",
"version": "v1"
}
] |
2022-03-02
|
[
[
"Kriewald",
"J.",
""
],
[
"Abada",
"A.",
""
],
[
"Teixeira",
"A. M.",
""
]
] |
In models where the Standard Model is extended by Majorana fermions, interference effects due to the presence of CP violating phases have been shown to play a crucial role in lepton number violating processes. However, important effects can also arise in lepton number conserving, but charged lepton flavour violating (cLFV) transitions and decays. Here we show that the presence of CP violating (Dirac and Majorana) phases can have a striking impact for the predicted rates of cLFV observables. We explore the interference effects in several cLFV observables, carrying for the first time a thorough analysis of the different observables and the implications for future observation. We discuss how the presence of leptonic CP violating phases might lead to a loss of correlation between observables (typically present in simple SM extensions via heavy sterile fermions), or even to the suppression of certain channels; these effects can be interpreted as suggestive of non-vanishing phases.
|
1312.6206
|
Pablo Roig
|
Pablo Roig and Juan Jos\'e Sanz Cillero
|
Consistent high-energy constraints in the anomalous QCD sector
|
11 pages, no figures. Comparison with the phenomenology extended.
Matches version to be published in PLB
|
Physics Letters B 733 (2014) 158-163
|
10.1016/j.physletb.2014.04.034
|
FTUAM-13-38, IFT-UAM/CSIC-13-136
|
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The anomalous <VVP> Green function and related form-factors (pi^0 to gamma^*
gamma^* and tau^- to X^- nu_tau vector form-factors, with X^-=(KKpi)^-, phi^-
gamma, (phi V)^-) are analyzed in this letter in the large-N_C limit. Within
the single (vector and pseudoscalar) resonance approximation and the context of
Resonance Chiral Theory, we show that all these observables over-determine in a
consistent way a unique set of compatible high-energy constraints for the
resonance couplings. This result is in agreement with analogous relations found
in the even intrinsic-parity sector of QCD like, e.g., F_V^2 = 3 F^2. The
antisymmetric tensor formalism is considered for the spin-one resonance fields.
Finally, we have also worked out and provide here the relation between the two
bases of odd intrinsic-parity Lagrangian operators commonly employed in the
literature.
|
[
{
"created": "Sat, 21 Dec 2013 05:29:59 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Apr 2014 23:42:20 GMT",
"version": "v2"
}
] |
2014-05-02
|
[
[
"Roig",
"Pablo",
""
],
[
"Cillero",
"Juan José Sanz",
""
]
] |
The anomalous <VVP> Green function and related form-factors (pi^0 to gamma^* gamma^* and tau^- to X^- nu_tau vector form-factors, with X^-=(KKpi)^-, phi^- gamma, (phi V)^-) are analyzed in this letter in the large-N_C limit. Within the single (vector and pseudoscalar) resonance approximation and the context of Resonance Chiral Theory, we show that all these observables over-determine in a consistent way a unique set of compatible high-energy constraints for the resonance couplings. This result is in agreement with analogous relations found in the even intrinsic-parity sector of QCD like, e.g., F_V^2 = 3 F^2. The antisymmetric tensor formalism is considered for the spin-one resonance fields. Finally, we have also worked out and provide here the relation between the two bases of odd intrinsic-parity Lagrangian operators commonly employed in the literature.
|
1905.07313
|
David Englert
|
Elena Accomando, David Englert, Ciara Byers, Jonathan Hays, Stefano
Moretti
|
Voyage Across the 2HDM Type-II with Magellan
|
22 pages, 12 figures
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We review the status of the 2-Higgs Doublet Model (2HDM) Type-II, in the
light of the current experimental results and various theoretical consistency
conditions. In doing so, we adopt a new numerical framework, called Magellan,
to explore the full parameter space of the model. Magellan uses a simple,
Markov Chain Monte Carlo technique for the exploration and leverages the use of
modern tools, allowing the user to perform inference on the model in an
efficient way. The framework exploits the output of well-known Higgs production
and decay programs, together with that of packages implementing the current
results of both direct and indirect Higgs boson searches. We further illustrate
how future measurements can be incorporated in such a framework, through the
example of neutral heavy Higgs boson production and decay via the gluon-gluon
fusion mode in a variety of final states.
|
[
{
"created": "Fri, 17 May 2019 15:08:42 GMT",
"version": "v1"
},
{
"created": "Sun, 27 Mar 2022 11:46:44 GMT",
"version": "v2"
}
] |
2022-03-29
|
[
[
"Accomando",
"Elena",
""
],
[
"Englert",
"David",
""
],
[
"Byers",
"Ciara",
""
],
[
"Hays",
"Jonathan",
""
],
[
"Moretti",
"Stefano",
""
]
] |
We review the status of the 2-Higgs Doublet Model (2HDM) Type-II, in the light of the current experimental results and various theoretical consistency conditions. In doing so, we adopt a new numerical framework, called Magellan, to explore the full parameter space of the model. Magellan uses a simple, Markov Chain Monte Carlo technique for the exploration and leverages the use of modern tools, allowing the user to perform inference on the model in an efficient way. The framework exploits the output of well-known Higgs production and decay programs, together with that of packages implementing the current results of both direct and indirect Higgs boson searches. We further illustrate how future measurements can be incorporated in such a framework, through the example of neutral heavy Higgs boson production and decay via the gluon-gluon fusion mode in a variety of final states.
|
1301.5283
|
Clara Salas
|
Martin Hentschinski, Agustin Sabio Vera, Clara Salas
|
Description of F2 and FL at small x using a collinearly-improved BFKL
resummation
|
12 pages, 47 figures
| null |
10.1103/PhysRevD.87.076005
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a detailed description of the Q^2 and x dependence of the
structure functions F2 and FL as extracted from the Deep Inelastic Scattering
data at HERA in the small Bjorken x region. Making use of a
collinearly-improved BFKL equation at next-to-leading order and a treatment of
the running of the coupling using non-Abelian physical renormalization together
with the BLM scale choice allows us to reach low values of Q^2. We also provide
some predictions for future lepton-hadron colliders.
|
[
{
"created": "Tue, 22 Jan 2013 19:13:11 GMT",
"version": "v1"
}
] |
2013-04-10
|
[
[
"Hentschinski",
"Martin",
""
],
[
"Vera",
"Agustin Sabio",
""
],
[
"Salas",
"Clara",
""
]
] |
We present a detailed description of the Q^2 and x dependence of the structure functions F2 and FL as extracted from the Deep Inelastic Scattering data at HERA in the small Bjorken x region. Making use of a collinearly-improved BFKL equation at next-to-leading order and a treatment of the running of the coupling using non-Abelian physical renormalization together with the BLM scale choice allows us to reach low values of Q^2. We also provide some predictions for future lepton-hadron colliders.
|
hep-ph/0009241
| null |
Harry J. Lipkin (Department of Particle Physics, Weizmann Institute of
Science. Faculty of Exact Sciences, Tel Aviv University. High Energy Physics
Division, Argonne National Laboratory)
|
Experimental Puzzles in Heavy Flavor Decays - Anomalously high $\eta'$
appearance in charmless strange B decays - Flavor SU(3) breaking in Charm
Decays
|
13 pages
|
Phys.Lett.B494:248-254,2000
|
10.1016/S0370-2693(00)01200-4
| null |
hep-ph
| null |
Simple experimental tests are proposed which can clarify the origin for the
anomalously high $\eta'$ appearance in charmless strange final states in $B$
decays and can investigate the the nature of SU(3) symmetry-breaking in weak
heavy flavor decays.
|
[
{
"created": "Wed, 20 Sep 2000 18:58:53 GMT",
"version": "v1"
}
] |
2014-11-17
|
[
[
"Lipkin",
"Harry J.",
"",
"Department of Particle Physics, Weizmann Institute of\n Science. Faculty of Exact Sciences, Tel Aviv University. High Energy Physics\n Division, Argonne National Laboratory"
]
] |
Simple experimental tests are proposed which can clarify the origin for the anomalously high $\eta'$ appearance in charmless strange final states in $B$ decays and can investigate the the nature of SU(3) symmetry-breaking in weak heavy flavor decays.
|
1202.0151
|
Eduardo Guendelman I
|
Doron Chelouche and Eduardo I. Guendelman
|
Radio-loud Magnetars as Detectors for Axions and Axion-like Particles
|
9 pages
|
IJMPE, Vol 20, Supplement 2 (2011), 100-108
|
10.1142/S0218301311040669
| null |
hep-ph astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We show that, by studying the arrival times of radio pulses from
highly-magnetized transient beamed sources, it may be possible to detect light
pseudo-scalar particles, such as axions and axion-like particles, whose
existence could have considerable implications for the strong-CP problem of QCD
as well as the dark matter problem in cosmology. Specifically, such light
bosons may be detected with a much greater sensitivity, over a broad particle
mass range, than is currently achievable by terrestrial experiments, and using
indirect astrophysical considerations. The observable effect was discussed in
Chelouche & Guendelman (2009), and is akin to the Stern-Gerlach experiment: the
splitting of a photon beam naturally arises when finite coupling exists between
the electro-magnetic field and the axion field. The splitting angle of the
light beams linearly depends on the photon wavelength, the size of the
magnetized region, and the magnetic field gradient in the transverse direction
to the propagation direction of the photons. If radio emission in radio-loud
magnetars is beamed and originates in regions with strong magnetic field
gradients, then splitting of individual pulses may be detectable. We quantify
the effect for a simplified model for magnetars, and search for radio beam
splitting in the 2\,GHz radio light curves of the radio loud magnetar
XTE\,J1810-197.
|
[
{
"created": "Wed, 1 Feb 2012 11:41:56 GMT",
"version": "v1"
}
] |
2015-06-04
|
[
[
"Chelouche",
"Doron",
""
],
[
"Guendelman",
"Eduardo I.",
""
]
] |
We show that, by studying the arrival times of radio pulses from highly-magnetized transient beamed sources, it may be possible to detect light pseudo-scalar particles, such as axions and axion-like particles, whose existence could have considerable implications for the strong-CP problem of QCD as well as the dark matter problem in cosmology. Specifically, such light bosons may be detected with a much greater sensitivity, over a broad particle mass range, than is currently achievable by terrestrial experiments, and using indirect astrophysical considerations. The observable effect was discussed in Chelouche & Guendelman (2009), and is akin to the Stern-Gerlach experiment: the splitting of a photon beam naturally arises when finite coupling exists between the electro-magnetic field and the axion field. The splitting angle of the light beams linearly depends on the photon wavelength, the size of the magnetized region, and the magnetic field gradient in the transverse direction to the propagation direction of the photons. If radio emission in radio-loud magnetars is beamed and originates in regions with strong magnetic field gradients, then splitting of individual pulses may be detectable. We quantify the effect for a simplified model for magnetars, and search for radio beam splitting in the 2\,GHz radio light curves of the radio loud magnetar XTE\,J1810-197.
|
2212.11230
|
Subhojit Roy
|
Subhojit Roy
|
Dilution of Dark Matter Relic abundance due to First Order Electroweak
Phase Transition in the singlet scalar extended type-II seesaw model
|
21 pages, 4 figures, 1 table
| null | null |
HRI-RECAPP-2022-015
|
hep-ph
|
http://creativecommons.org/publicdomain/zero/1.0/
|
We investigate the effect of a first-order electroweak phase transition
(FOEWPT), which is one of the prerequisites for electroweak baryogenesis, on
the thermal relic abundance of the dark matter (DM) that freezes out before the
phase transition occurs in the complex singlet scalar extended $Z_3$-invariant
type-II seesaw model that can simultaneously provide a DM candidate, explain
the non-vanishing neutrino masses and the baryon asymmetry of the Universe.
Such a phase transition around the electroweak scale leaves an impact on the
relic density due to the release of entropy, particularly for a TeV-scale DM.
We thus concentrate on the region of parameter space of the said model which
favors an FOEWPT in the early Universe and for which the DM is heavy such that
its freeze-out temperature turns out to be larger than the phase transition
temperature. We further study the dependencies of the dilution factor of the DM
relic density on the model parameters, the nucleation temperature, the strength
and the duration of the phase transition. Such a dilution might retrieve some
of the regions of parameter space that were previously ruled out by the
measured value of the DM relic density and/or the latest constraints from the
DM direct-detection experiments. Furthermore, a direct connection is drawn
between the dilution factor and the generation of stochastic gravitational
waves as a result of an FOEWPT.
|
[
{
"created": "Wed, 21 Dec 2022 17:56:36 GMT",
"version": "v1"
}
] |
2022-12-22
|
[
[
"Roy",
"Subhojit",
""
]
] |
We investigate the effect of a first-order electroweak phase transition (FOEWPT), which is one of the prerequisites for electroweak baryogenesis, on the thermal relic abundance of the dark matter (DM) that freezes out before the phase transition occurs in the complex singlet scalar extended $Z_3$-invariant type-II seesaw model that can simultaneously provide a DM candidate, explain the non-vanishing neutrino masses and the baryon asymmetry of the Universe. Such a phase transition around the electroweak scale leaves an impact on the relic density due to the release of entropy, particularly for a TeV-scale DM. We thus concentrate on the region of parameter space of the said model which favors an FOEWPT in the early Universe and for which the DM is heavy such that its freeze-out temperature turns out to be larger than the phase transition temperature. We further study the dependencies of the dilution factor of the DM relic density on the model parameters, the nucleation temperature, the strength and the duration of the phase transition. Such a dilution might retrieve some of the regions of parameter space that were previously ruled out by the measured value of the DM relic density and/or the latest constraints from the DM direct-detection experiments. Furthermore, a direct connection is drawn between the dilution factor and the generation of stochastic gravitational waves as a result of an FOEWPT.
|
1901.07077
|
Rabindra N. Mohapatra
|
Itzhak Goldman, Rabindra N. Mohapatra and Shmuel Nussinov
|
Bounds on Neutron- Mirror Neutron Mixing from Pulsar Timings and
Gravitational Wave Detections
|
18 pages; more examples of binary pulsars included; main conclusions
unchanged
|
Phys. Rev. D 100, 123021 (2019)
|
10.1103/PhysRevD.100.123021
| null |
hep-ph astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The mass loss in putative neutron star to mixed neutron - mirror neutron star
transition implies a significant change of orbital period. The precise
constancy of the latter can restrict scenarios recently suggested where neutron
to mirror neutron mixing occurring in neutron stars, transforms them into mixed
stars helping explain the narrow mass distribution observed for pulsars in
binary systems. The observation of a very old millisecond pulsar with a mass of
2 solar masses is an additional strong constraint on the above transition.We
also note that the observed gravitational waves signals from neutron-neutron
stars merger constrain the neutron to mirror neutron transitions inside neutron
stars. These considerations exclude a large region in the $\epsilon'$, $\delta
m'$ plane of the neutron-mirror neutron mixing and mass
|
[
{
"created": "Mon, 21 Jan 2019 20:56:38 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Feb 2019 18:21:17 GMT",
"version": "v2"
}
] |
2020-11-26
|
[
[
"Goldman",
"Itzhak",
""
],
[
"Mohapatra",
"Rabindra N.",
""
],
[
"Nussinov",
"Shmuel",
""
]
] |
The mass loss in putative neutron star to mixed neutron - mirror neutron star transition implies a significant change of orbital period. The precise constancy of the latter can restrict scenarios recently suggested where neutron to mirror neutron mixing occurring in neutron stars, transforms them into mixed stars helping explain the narrow mass distribution observed for pulsars in binary systems. The observation of a very old millisecond pulsar with a mass of 2 solar masses is an additional strong constraint on the above transition.We also note that the observed gravitational waves signals from neutron-neutron stars merger constrain the neutron to mirror neutron transitions inside neutron stars. These considerations exclude a large region in the $\epsilon'$, $\delta m'$ plane of the neutron-mirror neutron mixing and mass
|
hep-ph/9510454
|
Bernard Pire
|
B. Pire
|
Probing the polarized gluon content of the proton through $ \chi_2$
hadroproduction
|
to be published in the proceedings of the 2nd Meeting on Possible
Measurements of Singly Polarized pp and pn Collisions, Zeuthen (1995)
| null | null | null |
hep-ph
| null |
Determining how much spin is carried by gluon in a polarized proton is a
fundamental problem which cannot be resolved by completely inclusive deep
inelastic measurements. Hadroproduction of heavy flavors is very sensitive to
the gluon content of hadrons. We show that $\chi_2 (3555)$ production in
polarized proton-proton collisions is a good candidate reaction to address this
challenging question.
|
[
{
"created": "Tue, 31 Oct 1995 15:11:18 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Pire",
"B.",
""
]
] |
Determining how much spin is carried by gluon in a polarized proton is a fundamental problem which cannot be resolved by completely inclusive deep inelastic measurements. Hadroproduction of heavy flavors is very sensitive to the gluon content of hadrons. We show that $\chi_2 (3555)$ production in polarized proton-proton collisions is a good candidate reaction to address this challenging question.
|
2204.08248
|
June-Young Kim
|
June-Young Kim
|
Electromagnetic multipole structure of a spin-one particle: Abel
tomography case
|
14 pages, 6 figures
| null |
10.1103/PhysRevD.106.014022
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the three-dimensional~(3D) and two-dimensional~(2D) charge
distributions of a spin-one particle in terms of the multipole expansion. On
account of the geometrical difference between 2D and 3D spaces, projecting the
3D electric distribution to the 2D one in the Breit frame brings about the
influence of the quadrupole distribution upon the monopole one. Thus, the 2D
charge distribution becomes spin-dependent. This effect should be sorted out
from the relativistic effects arising from the Lorentz boost. We first provide
the connections between the 2D and 3D distributions in the Breit frame in terms
of the angle-dependent Abel transformation. We then provide the differential
equations that enable us to map 2D distributions in the Breit frame to those in
the infinite momentum frame.
|
[
{
"created": "Mon, 18 Apr 2022 10:52:22 GMT",
"version": "v1"
}
] |
2022-08-17
|
[
[
"Kim",
"June-Young",
""
]
] |
We investigate the three-dimensional~(3D) and two-dimensional~(2D) charge distributions of a spin-one particle in terms of the multipole expansion. On account of the geometrical difference between 2D and 3D spaces, projecting the 3D electric distribution to the 2D one in the Breit frame brings about the influence of the quadrupole distribution upon the monopole one. Thus, the 2D charge distribution becomes spin-dependent. This effect should be sorted out from the relativistic effects arising from the Lorentz boost. We first provide the connections between the 2D and 3D distributions in the Breit frame in terms of the angle-dependent Abel transformation. We then provide the differential equations that enable us to map 2D distributions in the Breit frame to those in the infinite momentum frame.
|
1001.4948
|
Vasyl' Rubish V.
|
V. Yu. Lazur, O. K. Reity and V. V. Rubish
|
Spherical model of the Stark effect in external scalar and vector fields
|
25 pages, 4 figures. Submitted to Int. J. Mod. Phys. A
|
International Journal of Modern Physics A Vol. 25, No. 16 (2010)
3235-3259
|
10.1142/S0217751X10049190
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The Bohr-Sommerfeld quantization rule and the Gamow formula for the width of
quasistationary level are generalized by taking into account the relativistic
effects, spin and Lorentz structure of interaction potentials. The relativistic
quasi-classical theory of ionization of the Coulomb system (V_{Coul}=-\xi/r) by
radial-constant long-range scalar (S_{l.r.}=(1-\lambda)(\sigma r+V_0)) and
vector (V_{l.r.}=\lambda(\sigma r+V_0)) fields is constructed. In the limiting
cases the approximated analytical expressions for the position E_r and width
\Gamma of below-barrier resonances are obtained. The strong dependence of the
width \Gamma of below-barrier resonances on both the bound level energy and the
mixing constant \lambda is detected. The simple analytical formulae for
asymptotic coefficients of the Dirac radial wave functions at zero and infinity
are also obtained.
|
[
{
"created": "Wed, 27 Jan 2010 13:51:42 GMT",
"version": "v1"
}
] |
2011-04-07
|
[
[
"Lazur",
"V. Yu.",
""
],
[
"Reity",
"O. K.",
""
],
[
"Rubish",
"V. V.",
""
]
] |
The Bohr-Sommerfeld quantization rule and the Gamow formula for the width of quasistationary level are generalized by taking into account the relativistic effects, spin and Lorentz structure of interaction potentials. The relativistic quasi-classical theory of ionization of the Coulomb system (V_{Coul}=-\xi/r) by radial-constant long-range scalar (S_{l.r.}=(1-\lambda)(\sigma r+V_0)) and vector (V_{l.r.}=\lambda(\sigma r+V_0)) fields is constructed. In the limiting cases the approximated analytical expressions for the position E_r and width \Gamma of below-barrier resonances are obtained. The strong dependence of the width \Gamma of below-barrier resonances on both the bound level energy and the mixing constant \lambda is detected. The simple analytical formulae for asymptotic coefficients of the Dirac radial wave functions at zero and infinity are also obtained.
|
hep-ph/0407194
|
Rabindra N. Mohapatra
|
R. N. Mohapatra and S. Nasri
|
Avoiding BBN Constraints on Mirror Models for Sterile Neutrinos
|
5 pages, latex; more discussion added; results unchanged
|
Phys.Rev. D71 (2005) 053001
|
10.1103/PhysRevD.71.053001
|
UMD-PP-05-003
|
hep-ph astro-ph
| null |
We point out that in models that explain the LSND result for neutrino
oscillation using the mirror neutrinos, the big bang nucleosynthesis constraint
can be avoided by using the late time phase transition that only helps to mix
the active and the sterile neutrinos. We discuss the astrophysical as well as
cosmological implications of this proposal.
|
[
{
"created": "Fri, 16 Jul 2004 18:11:33 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Jul 2004 18:33:46 GMT",
"version": "v2"
}
] |
2009-11-10
|
[
[
"Mohapatra",
"R. N.",
""
],
[
"Nasri",
"S.",
""
]
] |
We point out that in models that explain the LSND result for neutrino oscillation using the mirror neutrinos, the big bang nucleosynthesis constraint can be avoided by using the late time phase transition that only helps to mix the active and the sterile neutrinos. We discuss the astrophysical as well as cosmological implications of this proposal.
|
hep-ph/0201119
|
Markus Diehl
|
M. Diehl
|
Spin and other aspects of generalized parton distributions
|
9 pages, 2 figures. Talk given at Pacific Spin 2001, Beijing, China,
8-13 Oct. 2001
|
Int.J.Mod.Phys. A18 (2003) 1319-1326
|
10.1142/S0217751X03014666
| null |
hep-ph
| null |
I discuss how generalized parton distribution probe various aspects of QCD
bound states. Topics include the interplay between transverse and longitudinal
structure, quantum mechanical interference, orbital angular momentum, helicity
flip, and higher-spin targets.
|
[
{
"created": "Mon, 14 Jan 2002 13:54:40 GMT",
"version": "v1"
}
] |
2009-11-07
|
[
[
"Diehl",
"M.",
""
]
] |
I discuss how generalized parton distribution probe various aspects of QCD bound states. Topics include the interplay between transverse and longitudinal structure, quantum mechanical interference, orbital angular momentum, helicity flip, and higher-spin targets.
|
hep-ph/9602380
|
Wolfgang Hollik
|
W. Hollik
|
Electroweak Theory
|
62 pages, Latex + 10 figures (included) Lectures given at the 5th
Hellenic School and Workshops on Elementary Particle Physics, 3-24 September
1995, Corfu, Greece
| null | null |
KA-TP-4-1996
|
hep-ph
| null |
In these lectures we give a discussion of the structure of the electroweak
standard model and its quantum corrections for tests of the electroweak theory.
The predictions for the vector boson masses, neutrino scattering cross sections
and the $Z$ resonance observables are presented in some detail. We show
comparisons with the recent experimental data and their implications for the
present status of the Standard Model. Finally we address the question how
virtual New Physics can influence the predictions for the precision observables
and discuss the minimal supersymmetric standard model as a special example of
particular theoretical interest.
|
[
{
"created": "Fri, 23 Feb 1996 16:42:00 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Hollik",
"W.",
""
]
] |
In these lectures we give a discussion of the structure of the electroweak standard model and its quantum corrections for tests of the electroweak theory. The predictions for the vector boson masses, neutrino scattering cross sections and the $Z$ resonance observables are presented in some detail. We show comparisons with the recent experimental data and their implications for the present status of the Standard Model. Finally we address the question how virtual New Physics can influence the predictions for the precision observables and discuss the minimal supersymmetric standard model as a special example of particular theoretical interest.
|
hep-ph/9907423
|
Amol Dighe
|
Amol S. Dighe, Alexei Yu. Smirnov (ICTP, Trieste)
|
Identifying the neutrino mass spectrum from a supernova neutrino burst
|
53 pages, 13eps figures. Substantial changes made, new results,
figures and tables added
|
Phys.Rev. D62 (2000) 033007
|
10.1103/PhysRevD.62.033007
|
IC/99/83
|
hep-ph
| null |
We study the role that the future detection of the neutrino burst from a
galactic supernova can play in the reconstruction of the neutrino mass
spectrum. We consider all possible 3$\nu$ mass and flavor spectra which
describe the solar and atmospheric neutrino data. For each of these spectra we
find the observable effects of the supernova neutrino conversions both in the
matter of the star and the earth. We show that studies of the electron neutrino
and anineutrino spectra as well as observations of the neutral current effects
from supernova will allow us (i) to identify the solar neutrino solution, (ii)
to determine the type of mass hierarchy (normal or inverted) and (iii) to probe
the mixing $|U_{e3}|^2$ to values as low as $10^{-4} - 10^{-3}$.
|
[
{
"created": "Mon, 19 Jul 1999 22:37:44 GMT",
"version": "v1"
},
{
"created": "Sat, 18 Dec 1999 18:48:55 GMT",
"version": "v2"
}
] |
2009-10-31
|
[
[
"Dighe",
"Amol S.",
"",
"ICTP, Trieste"
],
[
"Smirnov",
"Alexei Yu.",
"",
"ICTP, Trieste"
]
] |
We study the role that the future detection of the neutrino burst from a galactic supernova can play in the reconstruction of the neutrino mass spectrum. We consider all possible 3$\nu$ mass and flavor spectra which describe the solar and atmospheric neutrino data. For each of these spectra we find the observable effects of the supernova neutrino conversions both in the matter of the star and the earth. We show that studies of the electron neutrino and anineutrino spectra as well as observations of the neutral current effects from supernova will allow us (i) to identify the solar neutrino solution, (ii) to determine the type of mass hierarchy (normal or inverted) and (iii) to probe the mixing $|U_{e3}|^2$ to values as low as $10^{-4} - 10^{-3}$.
|
hep-ph/0312315
|
Sandhya Choubey
|
Abhijit Bandyopadhyay, Sandhya Choubey, Srubabati Goswami, Kamales Kar
|
Prospects of probing $\theta_{13}$ and neutrino mass hierarchy by
Supernova Neutrinos in KamLAND
|
24 pages, 10 figures
| null | null |
SINP/TNP/03-44/, SISSA 114/2003/EP
|
hep-ph
| null |
In this paper we study the physics potential of the KamLAND detector in
probing neutrino oscillation parameters through observation of supernova
neutrinos. In particular, we discuss the possibilities of probing the mixing
angle $\theta_{13}$ and determining the sign of $\Delta m^2_{32}$ from the
total charged current(CC) event rates on the proton and $^{12}{C}$ target, as
well as from the CC spectra. We discuss the chances of probing the earth matter
effect induced modulations from the observation of CC spectra in the different
CC reactions in KamLAND and find the volume required to get a statistically
significant signature of the earth matter effect in different energy bins. We
also calculate the event rates expected in the neutral current (NC) reactions
on Carbon and free proton and investigate if the charged current to neutral
current ratios, which are free of the absolute luminosity uncertainty in the
supernova neutrino fluxes, can be useful in probing the oscillation parameters.
|
[
{
"created": "Mon, 22 Dec 2003 16:22:06 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Bandyopadhyay",
"Abhijit",
""
],
[
"Choubey",
"Sandhya",
""
],
[
"Goswami",
"Srubabati",
""
],
[
"Kar",
"Kamales",
""
]
] |
In this paper we study the physics potential of the KamLAND detector in probing neutrino oscillation parameters through observation of supernova neutrinos. In particular, we discuss the possibilities of probing the mixing angle $\theta_{13}$ and determining the sign of $\Delta m^2_{32}$ from the total charged current(CC) event rates on the proton and $^{12}{C}$ target, as well as from the CC spectra. We discuss the chances of probing the earth matter effect induced modulations from the observation of CC spectra in the different CC reactions in KamLAND and find the volume required to get a statistically significant signature of the earth matter effect in different energy bins. We also calculate the event rates expected in the neutral current (NC) reactions on Carbon and free proton and investigate if the charged current to neutral current ratios, which are free of the absolute luminosity uncertainty in the supernova neutrino fluxes, can be useful in probing the oscillation parameters.
|
0902.4892
|
Vladimir Kuksa
|
V.I.Kuksa
|
Factorization method in the model of unstable particles with a smeared
mass
|
18 pages,error corrected
|
Phys.Atom.Nucl.72:1063-1073,2009
|
10.1134/S1063778809060192
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The method of factorization, based on the model of unstable particles with a
smeared mass, is applied to the processes with an unstable particle in the
intermediate state. It was shown, that in the framework of the method
suggested, the decay rate and cross-section can be represented in the universal
factorized form for an arbitrary set of particles. An exact factorization is
caused by the specific structure of unstable particles propagators. We
performed the phenomenological analysis of the factorization effect.
|
[
{
"created": "Fri, 27 Feb 2009 18:46:55 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Aug 2009 07:43:08 GMT",
"version": "v2"
}
] |
2010-04-15
|
[
[
"Kuksa",
"V. I.",
""
]
] |
The method of factorization, based on the model of unstable particles with a smeared mass, is applied to the processes with an unstable particle in the intermediate state. It was shown, that in the framework of the method suggested, the decay rate and cross-section can be represented in the universal factorized form for an arbitrary set of particles. An exact factorization is caused by the specific structure of unstable particles propagators. We performed the phenomenological analysis of the factorization effect.
|
1209.2017
|
Shinya Matsuzaki
|
Shinya Matsuzaki and Koichi Yamawaki
|
Holographic techni-dilaton at 125 GeV
|
3 eps figures, 15 pages, latex; version to be published in PRD
| null |
10.1103/PhysRevD.86.115004
|
MISC-2012-16
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We find that a holographic walking technicolor model has a limit ("conformal
limit") where the techni-dilaton (TD) becomes an exactly massless
Nambu-Goldstone boson of the scale symmetry with its nonzero finite decay
constant F_phi /= 0, which naturally realizes a light TD, say at 125 GeV, near
the limit. In such a light TD case, we find that F_phi is uniquely determined
by the techni-pion decay constant F_pi independently of the holographic
parameters: F_phi/F_pi ~= sqrt{2 N_TF}, with N_TF being the number of
techni-fermions. We show that the holographic TD is consistent with a new boson
at 125 GeV recently discovered at the LHC.
|
[
{
"created": "Mon, 10 Sep 2012 14:56:44 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Nov 2012 15:31:53 GMT",
"version": "v2"
}
] |
2015-06-11
|
[
[
"Matsuzaki",
"Shinya",
""
],
[
"Yamawaki",
"Koichi",
""
]
] |
We find that a holographic walking technicolor model has a limit ("conformal limit") where the techni-dilaton (TD) becomes an exactly massless Nambu-Goldstone boson of the scale symmetry with its nonzero finite decay constant F_phi /= 0, which naturally realizes a light TD, say at 125 GeV, near the limit. In such a light TD case, we find that F_phi is uniquely determined by the techni-pion decay constant F_pi independently of the holographic parameters: F_phi/F_pi ~= sqrt{2 N_TF}, with N_TF being the number of techni-fermions. We show that the holographic TD is consistent with a new boson at 125 GeV recently discovered at the LHC.
|
1209.3976
|
Walaa Eshraim
|
Walaa. I. Eshraim, Stanislaus Janowski, Antje Peters, Klaus
Neuschwander, and Francesco Giacosa
|
Interaction of the pseudoscalar glueball with (pseudo)scalar mesons and
nucleons
|
Presented at the Workshop Excited QCD 2012, 6-12 May 2012, Peniche
(Portugal). 7 pages, 1 Table
| null | null | null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the interactions of the pseudoscalar glueball with scalar and
pseudoscalar quark-antiquark meson fields and with the nucleon and its chiral
partner. In both cases we introduce the corresponding chiral Lagrangian and
discuss its properties. We calculate the mesonic and baryonic decays of a
pseudoscalar glueball with mass of about 2.6 GeV as predicted by Lattice
simulations.
|
[
{
"created": "Tue, 18 Sep 2012 14:25:01 GMT",
"version": "v1"
}
] |
2012-09-19
|
[
[
"Eshraim",
"Walaa. I.",
""
],
[
"Janowski",
"Stanislaus",
""
],
[
"Peters",
"Antje",
""
],
[
"Neuschwander",
"Klaus",
""
],
[
"Giacosa",
"Francesco",
""
]
] |
We study the interactions of the pseudoscalar glueball with scalar and pseudoscalar quark-antiquark meson fields and with the nucleon and its chiral partner. In both cases we introduce the corresponding chiral Lagrangian and discuss its properties. We calculate the mesonic and baryonic decays of a pseudoscalar glueball with mass of about 2.6 GeV as predicted by Lattice simulations.
|
2012.09954
|
Volodymyr Vovchenko
|
Volodymyr Vovchenko, Volker Koch
|
Particlization of an interacting hadron resonance gas with global
conservation laws for event-by-event fluctuations in heavy-ion collisions
|
25 pages, 9 figures
|
Phys. Rev. C 103, 044903 (2021)
|
10.1103/PhysRevC.103.044903
| null |
hep-ph nucl-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We revisit the problem of particlization of a QCD fluid into hadrons and
resonances at the end of the fluid dynamical stage in relativistic heavy-ion
collisions in a context of fluctuation measurements. The existing methods
sample an ideal hadron resonance gas, therefore, they do not capture the
non-Poissonian nature of the grand-canonical fluctuations, expected due to QCD
dynamics such as the chiral transition or QCD critical point. We address the
issue by partitioning the particlization hypersurface into locally
grand-canonical fireballs populating the space-time rapidity axis that are
constrained by global conservation laws. The procedure allows to quantify the
effect of global conservation laws, volume fluctuations, thermal smearing and
resonance decays on fluctuation measurements in various rapidity acceptances,
and can be used in fluid dynamical simulations of heavy-ion collisions. As a
first application, we study event-by-event fluctuations in heavy-ion collisions
at the LHC using an excluded volume hadron resonance gas model matched to
lattice QCD susceptibilities, with a focus on (pseudo)rapidity acceptance
dependence of net baryon, net proton, and net charge cumulants. We point out
large differences between net proton and net baryon cumulant ratios that make
direct comparisons between the two unjustified. We observe that the existing
experimental data on net-charge fluctuations at the LHC shows a strong
suppression relative to a hadronic description.
|
[
{
"created": "Thu, 17 Dec 2020 22:15:34 GMT",
"version": "v1"
}
] |
2021-04-21
|
[
[
"Vovchenko",
"Volodymyr",
""
],
[
"Koch",
"Volker",
""
]
] |
We revisit the problem of particlization of a QCD fluid into hadrons and resonances at the end of the fluid dynamical stage in relativistic heavy-ion collisions in a context of fluctuation measurements. The existing methods sample an ideal hadron resonance gas, therefore, they do not capture the non-Poissonian nature of the grand-canonical fluctuations, expected due to QCD dynamics such as the chiral transition or QCD critical point. We address the issue by partitioning the particlization hypersurface into locally grand-canonical fireballs populating the space-time rapidity axis that are constrained by global conservation laws. The procedure allows to quantify the effect of global conservation laws, volume fluctuations, thermal smearing and resonance decays on fluctuation measurements in various rapidity acceptances, and can be used in fluid dynamical simulations of heavy-ion collisions. As a first application, we study event-by-event fluctuations in heavy-ion collisions at the LHC using an excluded volume hadron resonance gas model matched to lattice QCD susceptibilities, with a focus on (pseudo)rapidity acceptance dependence of net baryon, net proton, and net charge cumulants. We point out large differences between net proton and net baryon cumulant ratios that make direct comparisons between the two unjustified. We observe that the existing experimental data on net-charge fluctuations at the LHC shows a strong suppression relative to a hadronic description.
|
hep-ph/0303194
|
Eduard Kuraev
|
E. Bartos, E. A. Kuraev, S. Dubnicka
|
Sum rule for a difference of proton and neutron total photoproduction
cross-sections
|
LaTeX2e, 7 pages, 1 eps figure (revised version)
|
Phys.Rev.D70:117901,2004
|
10.1103/PhysRevD.70.117901
| null |
hep-ph
| null |
Starting from very high energy inelastic electron-nucleon scattering with a
production of a hadronic state $X$ to be moved closely to the direction of the
initial nucleon, then utilizing analytic properties of parts of forward virtual
Compton scattering amplitudes on proton and neutron, one obtains the relation
between nucleon form factors and a difference of proton and neutron
differential electroproduction cross-sections. In particular, for the case of
small transferred momenta, one finally derives sum rule, relating Dirac proton
mean square radius and anomalous magnetic moments of proton and neutron to the
integral over a difference of the total proton and neutron photoproduction
cross-sections.
|
[
{
"created": "Sun, 23 Mar 2003 18:52:17 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Mar 2003 08:59:24 GMT",
"version": "v2"
},
{
"created": "Tue, 1 Feb 2005 10:20:56 GMT",
"version": "v3"
}
] |
2011-07-19
|
[
[
"Bartos",
"E.",
""
],
[
"Kuraev",
"E. A.",
""
],
[
"Dubnicka",
"S.",
""
]
] |
Starting from very high energy inelastic electron-nucleon scattering with a production of a hadronic state $X$ to be moved closely to the direction of the initial nucleon, then utilizing analytic properties of parts of forward virtual Compton scattering amplitudes on proton and neutron, one obtains the relation between nucleon form factors and a difference of proton and neutron differential electroproduction cross-sections. In particular, for the case of small transferred momenta, one finally derives sum rule, relating Dirac proton mean square radius and anomalous magnetic moments of proton and neutron to the integral over a difference of the total proton and neutron photoproduction cross-sections.
|
hep-ph/0207043
|
S. weinzierl
|
Sven Moch, Peter Uwer and Stefan Weinzierl
|
Two-loop amplitudes with nested sums: Fermionic contributions to e+ e-
--> q qbar g
|
31 pages, a file "coefficients.h" with the results in FORM format is
included
|
Phys.Rev.D66:114001,2002
|
10.1103/PhysRevD.66.114001
| null |
hep-ph
| null |
We present the calculation of the nf-contributions to the two-loop amplitude
for e+ e- --> q qbar g and give results for the full one-loop amplitude to
order eps^2 in the dimensional regularization parameter. Our results agree with
those recently obtained by Garland et al.. The calculation makes extensive use
of an efficient method based on nested sums to calculate two-loop integrals
with arbitrary powers of the propagators. The use of nested sums leads in a
natural way to multiple polylogarithms with simple arguments, which allow a
straightforward analytic continuation.
|
[
{
"created": "Wed, 3 Jul 2002 11:25:46 GMT",
"version": "v1"
}
] |
2009-09-29
|
[
[
"Moch",
"Sven",
""
],
[
"Uwer",
"Peter",
""
],
[
"Weinzierl",
"Stefan",
""
]
] |
We present the calculation of the nf-contributions to the two-loop amplitude for e+ e- --> q qbar g and give results for the full one-loop amplitude to order eps^2 in the dimensional regularization parameter. Our results agree with those recently obtained by Garland et al.. The calculation makes extensive use of an efficient method based on nested sums to calculate two-loop integrals with arbitrary powers of the propagators. The use of nested sums leads in a natural way to multiple polylogarithms with simple arguments, which allow a straightforward analytic continuation.
|
1402.2849
|
Dustin Biedermann
|
Florian U. Bernlochner, Dustin Biedermann, Heiko Lacker, Thomas L\"uck
|
Constraints on exclusive branching fractions $BF_i(B^+\to X_c^il^+\nu)$
from moment measurements in inclusive $B\to X_cl\nu$ decays
|
57 pages, 28 figures, 23 tables
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
As an alternative to direct measurements, we extract exclusive branching
fractions of semileptonic B-meson decays to charmed mesons, $BF_i(B\to
X_c^il\nu)$ with $X_c^i = D, D^*, D_0, D'_1, D_1, D_2, D', D'^*$ and
non-resonant final states $(D^{(*)}\pi)_{nr}$, from a fit to electron energy,
hadronic mass and combined hadronic mass-energy moments measured in inclusive
$B\to X_cl\nu$ decays. The fit is performed by constraining the sum of
exclusive branching fractions to the measured value of $BF(B\to X_cl\nu)$, and
with different sets of additional constraining terms for the directly measured
branching fractions. There is no fit scenario in which a single branching
fraction alone is enhanced to close the gap between $BF(B\to X_cl\nu)$ and the
sum of known branching fractions $BF_i(B\to X_c^il\nu)$. The fitted $BF(B\to
D^*l\nu)$ is 5% to 10% larger than the direct measurement depending on whether
or not $BF(B\to D^*l\nu)$ is constrained to its direct measurement. $BF(B\to
Dl\nu)$ values are in good agreement with the direct measurement unless
$BF(B\to D^*l\nu)$ is constrained, which results in a higher $BF(B\to Dl\nu)$
value. Within large uncertainties, $BF(B\to D'_1l\nu)$ agrees with direct
measurements. Depending on the fit scenario, $BF(B\to D_0l\nu)$ is consistent
with or larger than its direct measurement. The fit is not able to easily
disentangle $B\to D_1l\nu$ and $B\to D_2l\nu$, and tends to increase the sum of
these two branching fractions. $BF(B\to (D^{(*)}\pi)_{nr}l\nu)$ with
non-resonant $(D^{(*)}\pi)_{nr}$ final states is found to be 0.2-0.4%,
consistent with $B\to D^{(*)}\pi l\nu$ and $B\to D^{**}(D^{(*)}\pi)l\nu$
measurements. No indication is found for significant contributions from so far
unmeasured $B\to D'^{(*)}l\nu$ decays assuming that the $D'$ and $D'^*$ can be
identified with the observed $D(2550)$, respectively, $D^*(2600)$ state.
|
[
{
"created": "Wed, 12 Feb 2014 15:21:39 GMT",
"version": "v1"
}
] |
2014-02-13
|
[
[
"Bernlochner",
"Florian U.",
""
],
[
"Biedermann",
"Dustin",
""
],
[
"Lacker",
"Heiko",
""
],
[
"Lück",
"Thomas",
""
]
] |
As an alternative to direct measurements, we extract exclusive branching fractions of semileptonic B-meson decays to charmed mesons, $BF_i(B\to X_c^il\nu)$ with $X_c^i = D, D^*, D_0, D'_1, D_1, D_2, D', D'^*$ and non-resonant final states $(D^{(*)}\pi)_{nr}$, from a fit to electron energy, hadronic mass and combined hadronic mass-energy moments measured in inclusive $B\to X_cl\nu$ decays. The fit is performed by constraining the sum of exclusive branching fractions to the measured value of $BF(B\to X_cl\nu)$, and with different sets of additional constraining terms for the directly measured branching fractions. There is no fit scenario in which a single branching fraction alone is enhanced to close the gap between $BF(B\to X_cl\nu)$ and the sum of known branching fractions $BF_i(B\to X_c^il\nu)$. The fitted $BF(B\to D^*l\nu)$ is 5% to 10% larger than the direct measurement depending on whether or not $BF(B\to D^*l\nu)$ is constrained to its direct measurement. $BF(B\to Dl\nu)$ values are in good agreement with the direct measurement unless $BF(B\to D^*l\nu)$ is constrained, which results in a higher $BF(B\to Dl\nu)$ value. Within large uncertainties, $BF(B\to D'_1l\nu)$ agrees with direct measurements. Depending on the fit scenario, $BF(B\to D_0l\nu)$ is consistent with or larger than its direct measurement. The fit is not able to easily disentangle $B\to D_1l\nu$ and $B\to D_2l\nu$, and tends to increase the sum of these two branching fractions. $BF(B\to (D^{(*)}\pi)_{nr}l\nu)$ with non-resonant $(D^{(*)}\pi)_{nr}$ final states is found to be 0.2-0.4%, consistent with $B\to D^{(*)}\pi l\nu$ and $B\to D^{**}(D^{(*)}\pi)l\nu$ measurements. No indication is found for significant contributions from so far unmeasured $B\to D'^{(*)}l\nu$ decays assuming that the $D'$ and $D'^*$ can be identified with the observed $D(2550)$, respectively, $D^*(2600)$ state.
|
1710.00391
|
Baptiste Cabouat M
|
Baptiste Cabouat (The University of Manchester) and Torbj\"orn
Sj\"ostrand (Lund University)
|
Some Dipole Shower Studies
|
31 pages, 17 figures and 3 tables
|
Cabouat, B. & Sjostrand, T. Eur. Phys. J. C (2018) 78: 226
|
10.1140/epjc/s10052-018-5645-z
|
MCnet-17-14, LU TP 17-28
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Parton showers have become a standard component in the description of
high-energy collisions. Nowadays most final-state ones are of the dipole
character, wherein a pair of partons branches into three, with energy and
momentum preserved inside this subsystem. For initial-state showers a dipole
picture is also possible and commonly used, but the older global-recoil
strategy remains a valid alternative, wherein larger groups of partons share
the energy--momentum preservation task. In this article we introduce and
implement a dipole picture also for initial-state radiation in PYTHIA, and
compare with the existing global-recoil one, and with data. For the case of
Deeply Inelastic Scattering we can directly compare with matrix element
expressions and show that the dipole picture gives a very good description over
the whole phase space, at least for the first branching.
|
[
{
"created": "Sun, 1 Oct 2017 18:55:37 GMT",
"version": "v1"
},
{
"created": "Fri, 30 Mar 2018 12:38:05 GMT",
"version": "v2"
}
] |
2018-04-18
|
[
[
"Cabouat",
"Baptiste",
"",
"The University of Manchester"
],
[
"Sjöstrand",
"Torbjörn",
"",
"Lund University"
]
] |
Parton showers have become a standard component in the description of high-energy collisions. Nowadays most final-state ones are of the dipole character, wherein a pair of partons branches into three, with energy and momentum preserved inside this subsystem. For initial-state showers a dipole picture is also possible and commonly used, but the older global-recoil strategy remains a valid alternative, wherein larger groups of partons share the energy--momentum preservation task. In this article we introduce and implement a dipole picture also for initial-state radiation in PYTHIA, and compare with the existing global-recoil one, and with data. For the case of Deeply Inelastic Scattering we can directly compare with matrix element expressions and show that the dipole picture gives a very good description over the whole phase space, at least for the first branching.
|
hep-ph/9904389
|
Grzegorz Wilk
|
Richard M. Weiner
|
Boson Interferometry in High Energy Physics
|
LaTeX file and 10 postscript files with figures, 149 pages
altogether. To be published in Phys. Rep. (1999)
|
Phys.Rept. 327 (2000) 249-346
|
10.1016/S0370-1573(99)00114-3
| null |
hep-ph nucl-th
| null |
Intensity interferometry and in particular that due to Bose Einstein
correlations (BEC) constitutes at present the only direct experimental method
for the determination of sizes and lifetimes of sources in particle and nuclear
physics. The measurement of these is essential for an understanding of the
dynamics of strong interactions which are responsible for the existence and
properties of atomic nuclei. Moreover a new state of matter, quark matter, in
which the ultimate constituents of matter move freely, is within the reach of
present accelerators or those under construction. The confirmation of the
existence of this new state is intimately linked with the determination of its
space-time properties. Furthermore BEC provides information about quantum
coherence which lies at the basis of the phenomenon of Bose-Einstein
condensation seen in many chapters of physics. Coherence and the associated
classical fields are essential ingredients in modern theories of particle
physics including the standard model. Last but not least besides this
"applicative" aspect of BEC, this effect has implications for the foundations
of quantum mechanics including the understanding of the concept of ``identical
particles". Recent theoretical developments in BEC are reviewed and their
application in high energy particle and heavy-ion reactions is analyzed. The
treated topics include: a) a comparison between the wave-function approach and
the space-time approach based on classical currents, which predicts
"surprising" particle anti-particle BEC b) the study of final state
interactions c) the use of hydrodynamics d) the relation between correlations
and multiplicity distributions.
|
[
{
"created": "Mon, 19 Apr 1999 14:41:27 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Weiner",
"Richard M.",
""
]
] |
Intensity interferometry and in particular that due to Bose Einstein correlations (BEC) constitutes at present the only direct experimental method for the determination of sizes and lifetimes of sources in particle and nuclear physics. The measurement of these is essential for an understanding of the dynamics of strong interactions which are responsible for the existence and properties of atomic nuclei. Moreover a new state of matter, quark matter, in which the ultimate constituents of matter move freely, is within the reach of present accelerators or those under construction. The confirmation of the existence of this new state is intimately linked with the determination of its space-time properties. Furthermore BEC provides information about quantum coherence which lies at the basis of the phenomenon of Bose-Einstein condensation seen in many chapters of physics. Coherence and the associated classical fields are essential ingredients in modern theories of particle physics including the standard model. Last but not least besides this "applicative" aspect of BEC, this effect has implications for the foundations of quantum mechanics including the understanding of the concept of ``identical particles". Recent theoretical developments in BEC are reviewed and their application in high energy particle and heavy-ion reactions is analyzed. The treated topics include: a) a comparison between the wave-function approach and the space-time approach based on classical currents, which predicts "surprising" particle anti-particle BEC b) the study of final state interactions c) the use of hydrodynamics d) the relation between correlations and multiplicity distributions.
|
hep-ph/0302038
|
Zurab Tavartkiladze
|
Filipe Paccetti Correia, Michael G. Schmidt, Zurab Tavartkiladze
|
Precursors From $S^{(1)}/Z_2\tm Z_2'$ Orbifold GUTs
|
Note and references added
|
Phys.Lett.B566:226-232,2003; Phys.Lett.B567:93-99,2003
|
10.1016/S0370-2693(03)00841-4
| null |
hep-ph hep-th
| null |
The possibility of appearance of GUT precursors near the TeV scale (suggested
by Dienes-Dudas-Gherghetta) is addressed within 5D GUTs compactified on an
$S^{(1)}/Z_2\tm Z_2'$ orbifold. For a low compactification scale (large
radius), there is a significant non universal logarithmic contribution in the
relative running of gauge couplings. This within 5D SU(5), with the minimal
field content, gives wrong prediction for $\al_3(M_Z)$ unless one goes beyond
the minimal setting. The realization of the light precursors' idea thus
requires some specific extensions. As a scenario alternative to SU(5) we also
consider an SU(6) orbifold GUT, whose minimal non SUSY version gives natural
unification. In all the presented unification scenarios with light precursors,
various GUT scales are realized. This allows the model to be naturally embedded
in either heterotic or Type ${\rm I}$ string theories.
|
[
{
"created": "Wed, 5 Feb 2003 18:07:43 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Jun 2003 12:15:27 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Correia",
"Filipe Paccetti",
""
],
[
"Schmidt",
"Michael G.",
""
],
[
"Tavartkiladze",
"Zurab",
""
]
] |
The possibility of appearance of GUT precursors near the TeV scale (suggested by Dienes-Dudas-Gherghetta) is addressed within 5D GUTs compactified on an $S^{(1)}/Z_2\tm Z_2'$ orbifold. For a low compactification scale (large radius), there is a significant non universal logarithmic contribution in the relative running of gauge couplings. This within 5D SU(5), with the minimal field content, gives wrong prediction for $\al_3(M_Z)$ unless one goes beyond the minimal setting. The realization of the light precursors' idea thus requires some specific extensions. As a scenario alternative to SU(5) we also consider an SU(6) orbifold GUT, whose minimal non SUSY version gives natural unification. In all the presented unification scenarios with light precursors, various GUT scales are realized. This allows the model to be naturally embedded in either heterotic or Type ${\rm I}$ string theories.
|
hep-ph/0302031
|
Zoltan Ligeti
|
Zoltan Ligeti
|
Introduction to Heavy Meson Decays and CP Asymmetries
|
~68 pages; Lectures given at the 30th SLAC Summer Institute: Secrets
of the B Meson (SSI 2002), SLAC, August 5-16, 2002
|
ECONF C020805:L02,2002
| null |
LBNL-51835
|
hep-ph hep-ex
| null |
These lectures are intended to provide an introduction to heavy meson decays
and CP violation. The first lecture contains a brief review of the standard
model and how the CKM matrix and CP violation arise, mixing and CP violation in
neutral meson systems, and explanation of the cleanliness of the sin(2beta)
measurement. The second lecture deals with the heavy quark limit, some
applications of heavy quark symmetry and the operator product expansion for
exclusive and inclusive semileptonic B decays. The third lecture concerns with
theoretically clean CP violation measurements that may become possible in the
future, and some developments toward a better understanding of nonleptonic B
decays. The conclusions include a subjective best buy list for the near future.
|
[
{
"created": "Wed, 5 Feb 2003 18:06:39 GMT",
"version": "v1"
}
] |
2014-11-17
|
[
[
"Ligeti",
"Zoltan",
""
]
] |
These lectures are intended to provide an introduction to heavy meson decays and CP violation. The first lecture contains a brief review of the standard model and how the CKM matrix and CP violation arise, mixing and CP violation in neutral meson systems, and explanation of the cleanliness of the sin(2beta) measurement. The second lecture deals with the heavy quark limit, some applications of heavy quark symmetry and the operator product expansion for exclusive and inclusive semileptonic B decays. The third lecture concerns with theoretically clean CP violation measurements that may become possible in the future, and some developments toward a better understanding of nonleptonic B decays. The conclusions include a subjective best buy list for the near future.
|
1607.06382
|
Jian Wang
|
Hai Tao Li, Jian Wang
|
Fully Differential Higgs Pair Production in Association With a $W$ Boson
at Next-to-Next-to-Leading Order in QCD
|
7 pages, 7 figures, matched to the published version in PLB
|
Phys. Lett. B 765 (2017) 265
|
10.1016/j.physletb.2016.12.030
|
COEPP-MN-16-17, MITP/16-054
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
To clarify the electroweak symmetry breaking mechanism, we need to probe the
Higgs self-couplings, which can be measured in Higgs pair productions. The
associated production with a vector boson is special due to a clear tag in the
final state. We perform a fully differential next-to-next-to-leading-order
calculation of the Higgs pair production in association with a $W$ boson at
hadron colliders, and present numerical results at the 14 TeV LHC and a future
100 TeV hadron collider.
|
[
{
"created": "Thu, 21 Jul 2016 16:33:33 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Dec 2016 15:04:20 GMT",
"version": "v2"
}
] |
2016-12-23
|
[
[
"Li",
"Hai Tao",
""
],
[
"Wang",
"Jian",
""
]
] |
To clarify the electroweak symmetry breaking mechanism, we need to probe the Higgs self-couplings, which can be measured in Higgs pair productions. The associated production with a vector boson is special due to a clear tag in the final state. We perform a fully differential next-to-next-to-leading-order calculation of the Higgs pair production in association with a $W$ boson at hadron colliders, and present numerical results at the 14 TeV LHC and a future 100 TeV hadron collider.
|
hep-ph/0409182
|
Dong-Won Jung
|
Dong-Won Jung
|
Neutrino Oscillations and Collider Test of the R-parity Violating mSUGRA
Model
|
To appear in the proceedings of 'SUSY 2004'
| null | null | null |
hep-ph
| null |
We study the R-parity violating minimal supergravity models accounting for
the observed neutrino masses and mixing, which can be tested in future collider
experiments. The bi-large mixing can be explained by allowing five dominant
tri-linear couplings $ \lambda'_{1,2,3}$ and $\lambda_{1,2}$. The desired ratio
of the atmospheric and solar neutrino mass-squared differences can be obtained
in a very limited parameter space where the tree-level contribution is tuned to
be suppressed. In this allowed region, we quantify the correlation between the
three neutrino mixing angles and the tri-linear R-parity violating couplings.
Such a prediction on the couplings can be tested in the next linear colliders
by observing the branching ratios of the lightest supersymmetric particle
(LSP). For the stau or the neutralino LSP, the ratio $|\lambda_1|^2:
|\lambda_2|^2: |\lambda_1|^2 + |\lambda_2|^2$ can be measured by establishing
$Br(e\nu): Br(\mu\nu) : Br(\tau\nu)$ or $Br(\nu e^\pm \tau^\mp):
Br(\nu\mu^\pm\tau^\mp) : Br(\nu\tau^\pm\tau^\mp)$, respectively. The
information on the couplings $\lambda'_i$ can be drawn by measuring $Br(l_i t
\bar{b}) \propto |\lambda'_i|^2$ if the neutralino LSP is heavier than the top
quark.
|
[
{
"created": "Wed, 15 Sep 2004 14:54:38 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Jung",
"Dong-Won",
""
]
] |
We study the R-parity violating minimal supergravity models accounting for the observed neutrino masses and mixing, which can be tested in future collider experiments. The bi-large mixing can be explained by allowing five dominant tri-linear couplings $ \lambda'_{1,2,3}$ and $\lambda_{1,2}$. The desired ratio of the atmospheric and solar neutrino mass-squared differences can be obtained in a very limited parameter space where the tree-level contribution is tuned to be suppressed. In this allowed region, we quantify the correlation between the three neutrino mixing angles and the tri-linear R-parity violating couplings. Such a prediction on the couplings can be tested in the next linear colliders by observing the branching ratios of the lightest supersymmetric particle (LSP). For the stau or the neutralino LSP, the ratio $|\lambda_1|^2: |\lambda_2|^2: |\lambda_1|^2 + |\lambda_2|^2$ can be measured by establishing $Br(e\nu): Br(\mu\nu) : Br(\tau\nu)$ or $Br(\nu e^\pm \tau^\mp): Br(\nu\mu^\pm\tau^\mp) : Br(\nu\tau^\pm\tau^\mp)$, respectively. The information on the couplings $\lambda'_i$ can be drawn by measuring $Br(l_i t \bar{b}) \propto |\lambda'_i|^2$ if the neutralino LSP is heavier than the top quark.
|
1002.0900
|
Gilad Perez
|
Gino Isidori, Yosef Nir and Gilad Perez
|
Flavor Physics Constraints for Physics Beyond the Standard Model
|
33 pages, 2 figures, typos corrected [in particular Eq. (3.5) and
table I. were modified], Refs. added, invited review submitted to Ann. Rev.
Nucl. Part. Sci.
|
Ann.Rev.Nucl.Part.Sci.60:355,2010
|
10.1146/annurev.nucl.012809.104534
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In the last decade, huge progress in experimentally measuring and
theoretically understanding flavor physics has been achieved. In particular,
the accuracy in the determination of the CKM elements has been greatly
improved, and a large number of flavor changing neutral current processes,
involving b -> d, b -> s and c -> u transitions, and of CP violating
asymmetries, have been measured. No evidence for new physics has been
established. Consequently, strong constraints on new physics at high scale
apply. In particular, the flavor structure of new physics at the TeV scale is
strongly constrained. We review these constraints and we discuss which are the
future prospects to better understand the flavor structure of physics beyond
the Standard Model.
|
[
{
"created": "Thu, 4 Feb 2010 04:46:36 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Mar 2010 11:18:40 GMT",
"version": "v2"
}
] |
2015-05-18
|
[
[
"Isidori",
"Gino",
""
],
[
"Nir",
"Yosef",
""
],
[
"Perez",
"Gilad",
""
]
] |
In the last decade, huge progress in experimentally measuring and theoretically understanding flavor physics has been achieved. In particular, the accuracy in the determination of the CKM elements has been greatly improved, and a large number of flavor changing neutral current processes, involving b -> d, b -> s and c -> u transitions, and of CP violating asymmetries, have been measured. No evidence for new physics has been established. Consequently, strong constraints on new physics at high scale apply. In particular, the flavor structure of new physics at the TeV scale is strongly constrained. We review these constraints and we discuss which are the future prospects to better understand the flavor structure of physics beyond the Standard Model.
|
1312.1716
|
Kim Maltman
|
P.A. Boyle, L. Del Debbio, N. Garron, R.J. Hudspith, E. Kerrane, K.
Maltman, J.M. Zanotti
|
Lattice Input on the Inclusive $\tau$ Decay $V_{us}$ Puzzle
|
5 pages, 2 figures. Contribution to the proceedings of the
International Workshop on e^+ e^- Collisions from Phi to Psi, 2013
| null |
10.1142/S2010194514604414
| null |
hep-ph hep-ex hep-lat
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Recent analyses of flavor-breaking hadronic-$\tau$-decay-based sum rules
produce values of $\vert V_{us}\vert$ $\sim 3\sigma$ low compared to 3-family
unitarity expectations. An unresolved systematic issue is the significant
variation in $\vert V_{us}\vert$ produced by different prescriptions for
treating the slowly converging $D=2$ OPE series. We investigate the reliability
of these prescriptions using lattice data for various flavor-breaking
correlators and show the fixed-scale prescription is clearly preferred.
Preliminary updates of the conventional $\tau$-based, and related mixed
$\tau$-electroproduction-data-based, sum rule analyses incorporating B-factory
results for low-multiplicity strange $\tau$ decay mode distributions are then
performed. Use of the preferred FOPT $D=2$ OPE prescription is shown to
significantly reduce the discrepancy between 3-family unitarity expectations
and the sum rule results.
|
[
{
"created": "Thu, 5 Dec 2013 21:56:04 GMT",
"version": "v1"
}
] |
2015-06-18
|
[
[
"Boyle",
"P. A.",
""
],
[
"Del Debbio",
"L.",
""
],
[
"Garron",
"N.",
""
],
[
"Hudspith",
"R. J.",
""
],
[
"Kerrane",
"E.",
""
],
[
"Maltman",
"K.",
""
],
[
"Zanotti",
"J. M.",
""
]
] |
Recent analyses of flavor-breaking hadronic-$\tau$-decay-based sum rules produce values of $\vert V_{us}\vert$ $\sim 3\sigma$ low compared to 3-family unitarity expectations. An unresolved systematic issue is the significant variation in $\vert V_{us}\vert$ produced by different prescriptions for treating the slowly converging $D=2$ OPE series. We investigate the reliability of these prescriptions using lattice data for various flavor-breaking correlators and show the fixed-scale prescription is clearly preferred. Preliminary updates of the conventional $\tau$-based, and related mixed $\tau$-electroproduction-data-based, sum rule analyses incorporating B-factory results for low-multiplicity strange $\tau$ decay mode distributions are then performed. Use of the preferred FOPT $D=2$ OPE prescription is shown to significantly reduce the discrepancy between 3-family unitarity expectations and the sum rule results.
|
1107.5055
|
Natalia Toro
|
Mariangela Lisanti, Philip Schuster, Matthew Strassler, Natalia Toro
|
Study of LHC Searches for a Lepton and Many Jets
|
23 pages, 12 figures, 1 table
| null |
10.1007/JHEP11(2012)081
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Searches for new physics in high-multiplicity events with little or no
missing energy are an important component of the LHC program, complementary to
analyses that rely on missing energy. We consider the potential reach of
searches for events with a lepton and six or more jets, and show they can
provide increased sensitivity to many supersymmetric and exotic models that
would not be detected through standard missing-energy analyses. Among these are
supersymmetric models with gauge mediation, R-parity violation, and light
hidden sectors. Moreover, ATLAS and CMS measurements suggest the primary
background in this channel is from t-tbar, rather than W+jets or QCD, which
reduces the complexity of background modeling necessary for such a search. We
also comment on related searches where the lepton is replaced with another
visible object, such as a Z boson.
|
[
{
"created": "Mon, 25 Jul 2011 20:03:19 GMT",
"version": "v1"
}
] |
2015-05-28
|
[
[
"Lisanti",
"Mariangela",
""
],
[
"Schuster",
"Philip",
""
],
[
"Strassler",
"Matthew",
""
],
[
"Toro",
"Natalia",
""
]
] |
Searches for new physics in high-multiplicity events with little or no missing energy are an important component of the LHC program, complementary to analyses that rely on missing energy. We consider the potential reach of searches for events with a lepton and six or more jets, and show they can provide increased sensitivity to many supersymmetric and exotic models that would not be detected through standard missing-energy analyses. Among these are supersymmetric models with gauge mediation, R-parity violation, and light hidden sectors. Moreover, ATLAS and CMS measurements suggest the primary background in this channel is from t-tbar, rather than W+jets or QCD, which reduces the complexity of background modeling necessary for such a search. We also comment on related searches where the lepton is replaced with another visible object, such as a Z boson.
|
1311.5210
|
Jaime Hern\'andez-S\'anchez Dr.
|
O. F\'elix-Beltr\'an, F. Gonz\'alez-Canales, J. Hern\'andez-S\'anchez,
S. Moretti, R. Noriega-Papaqui and A. Rosado
|
Analysis of the quark sector in the 2HDM-III with a four-zero Yukawa
texture using the most recent data on the CKM matrix
|
12 pages, 1 figure. Version accepted in Phys. Lett. B
| null | null |
DCP-13-04
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this letter we analyse, in the context of the general 2-Higgs Doublet
Model, the structure of the Yukawa matrices, $\widetilde{ \bf Y}_{ _{1,2}
}^{q}$, by assuming a four-zero texture ansatz for their definition. In this
framework, we obtain compact expressions for $\widetilde{ \bf Y}_{ _{1,2}
}^{q}$, which are reduced to the Cheng and Sher ansatz with the difference that
they are obtained naturally as a direct consequence of the invariants of the
fermion mass matrices. Furthermore, in order to avoid large flavour violating
effects coming from charged Higgs exchange, we consider the main flavour
constraints on the off-diagonal terms of Yukawa texture {{$\left(
\widetilde{\chi}_{j}^q \right)_{kl}$}} ($k\neq l$). We perform a $\chi^2$-fit
based on current experimental data on the quark masses and the
Cabibbo-Kobayashi-Maskawa mixing matrix ${ \bf V}_{\rm CKM }$. Hence, we obtain
the allowed ranges for the parameters $\widetilde{ \bf Y}_{ _{1,2} }^{q}$ at
1$\sigma$ for several values of $\tan \beta$. The results are in complete
agreement with the bounds obtained taking into account constraints on Flavour
Changing Neutral Currents reported in the literature.
|
[
{
"created": "Wed, 20 Nov 2013 20:39:24 GMT",
"version": "v1"
},
{
"created": "Fri, 6 Dec 2013 17:52:13 GMT",
"version": "v2"
},
{
"created": "Mon, 9 Feb 2015 22:46:56 GMT",
"version": "v3"
}
] |
2015-02-11
|
[
[
"Félix-Beltrán",
"O.",
""
],
[
"González-Canales",
"F.",
""
],
[
"Hernández-Sánchez",
"J.",
""
],
[
"Moretti",
"S.",
""
],
[
"Noriega-Papaqui",
"R.",
""
],
[
"Rosado",
"A.",
""
]
] |
In this letter we analyse, in the context of the general 2-Higgs Doublet Model, the structure of the Yukawa matrices, $\widetilde{ \bf Y}_{ _{1,2} }^{q}$, by assuming a four-zero texture ansatz for their definition. In this framework, we obtain compact expressions for $\widetilde{ \bf Y}_{ _{1,2} }^{q}$, which are reduced to the Cheng and Sher ansatz with the difference that they are obtained naturally as a direct consequence of the invariants of the fermion mass matrices. Furthermore, in order to avoid large flavour violating effects coming from charged Higgs exchange, we consider the main flavour constraints on the off-diagonal terms of Yukawa texture {{$\left( \widetilde{\chi}_{j}^q \right)_{kl}$}} ($k\neq l$). We perform a $\chi^2$-fit based on current experimental data on the quark masses and the Cabibbo-Kobayashi-Maskawa mixing matrix ${ \bf V}_{\rm CKM }$. Hence, we obtain the allowed ranges for the parameters $\widetilde{ \bf Y}_{ _{1,2} }^{q}$ at 1$\sigma$ for several values of $\tan \beta$. The results are in complete agreement with the bounds obtained taking into account constraints on Flavour Changing Neutral Currents reported in the literature.
|
1203.1622
|
Matthew McCullough
|
Nathaniel Craig, Matthew McCullough, Jesse Thaler
|
Flavor Mediation Delivers Natural SUSY
|
17 pages, 7 figures, 2 tables. v2 references added, minor changes to
flavor constraints and a little discussion added
| null |
10.1007/JHEP06(2012)046
|
MIT-CTP 4350, RU-NHETC 2012-03
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
If supersymmetry (SUSY) solves the hierarchy problem, then naturalness
considerations coupled with recent LHC bounds require non-trivial superpartner
flavor structures. Such "Natural SUSY" models exhibit a large mass hierarchy
between scalars of the third and first two generations as well as degeneracy
(or alignment) among the first two generations. In this work, we show how this
specific beyond the standard model (SM) flavor structure can be tied directly
to SM flavor via "Flavor Mediation". The SM contains an anomaly-free SU(3)
flavor symmetry, broken only by Yukawa couplings. By gauging this flavor
symmetry in addition to SM gauge symmetries, we can mediate SUSY breaking via
(Higgsed) gauge mediation. This automatically delivers a natural SUSY spectrum.
Third-generation scalar masses are suppressed due to the dominant breaking of
the flavor gauge symmetry in the top direction. More subtly, the
first-two-generation scalars remain highly degenerate due to a custodial U(2)
symmetry, where the SU(2) factor arises because SU(3) is rank two. This
custodial symmetry is broken only at order (m_c/m_t)^2. SUSY gauge coupling
unification predictions are preserved, since no new charged matter is
introduced, the SM gauge structure is unaltered, and the flavor symmetry treats
all matter multiplets equally. Moreover, the uniqueness of the anomaly-free
SU(3) flavor group makes possible a number of concrete predictions for the
superpartner spectrum.
|
[
{
"created": "Wed, 7 Mar 2012 21:00:05 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Apr 2012 20:08:25 GMT",
"version": "v2"
}
] |
2015-06-04
|
[
[
"Craig",
"Nathaniel",
""
],
[
"McCullough",
"Matthew",
""
],
[
"Thaler",
"Jesse",
""
]
] |
If supersymmetry (SUSY) solves the hierarchy problem, then naturalness considerations coupled with recent LHC bounds require non-trivial superpartner flavor structures. Such "Natural SUSY" models exhibit a large mass hierarchy between scalars of the third and first two generations as well as degeneracy (or alignment) among the first two generations. In this work, we show how this specific beyond the standard model (SM) flavor structure can be tied directly to SM flavor via "Flavor Mediation". The SM contains an anomaly-free SU(3) flavor symmetry, broken only by Yukawa couplings. By gauging this flavor symmetry in addition to SM gauge symmetries, we can mediate SUSY breaking via (Higgsed) gauge mediation. This automatically delivers a natural SUSY spectrum. Third-generation scalar masses are suppressed due to the dominant breaking of the flavor gauge symmetry in the top direction. More subtly, the first-two-generation scalars remain highly degenerate due to a custodial U(2) symmetry, where the SU(2) factor arises because SU(3) is rank two. This custodial symmetry is broken only at order (m_c/m_t)^2. SUSY gauge coupling unification predictions are preserved, since no new charged matter is introduced, the SM gauge structure is unaltered, and the flavor symmetry treats all matter multiplets equally. Moreover, the uniqueness of the anomaly-free SU(3) flavor group makes possible a number of concrete predictions for the superpartner spectrum.
|
1503.00101
|
Renata Jora
|
Amir H. Fariborz, Renata Jora, Joseph Schechter
|
How important is $i\epsilon$ in QFT?
|
5 pages, 1 figure
|
Int. J. Mod. Phys. A 30, 1550071, 2015
|
10.1142/S0217751X15500712
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss the role of $i\epsilon$ in quantum field theories and suggest that
it can be identified with the dimensional regularization parameter
$i\epsilon=4-d$ thus clarifying and simplifying issues related to the infrared
divergences without altering any of the present knowledge in QFT. We further
present the relevance of this assumption for the optical theorem.
|
[
{
"created": "Sat, 28 Feb 2015 08:59:07 GMT",
"version": "v1"
},
{
"created": "Mon, 25 May 2015 11:54:42 GMT",
"version": "v2"
}
] |
2015-05-26
|
[
[
"Fariborz",
"Amir H.",
""
],
[
"Jora",
"Renata",
""
],
[
"Schechter",
"Joseph",
""
]
] |
We discuss the role of $i\epsilon$ in quantum field theories and suggest that it can be identified with the dimensional regularization parameter $i\epsilon=4-d$ thus clarifying and simplifying issues related to the infrared divergences without altering any of the present knowledge in QFT. We further present the relevance of this assumption for the optical theorem.
|
hep-ph/0304121
|
Patrizia Bucci
|
Patrizia Bucci, Bohdan Grzadkowski
|
The Effective Potential and Vacuum Stability within Universal Extra
Dimensions
|
29 pages, 5 figures. Revised version to be published in Phys. Rev. D.
Several minor changes made. New references added
|
Phys.Rev. D68 (2003) 124002
|
10.1103/PhysRevD.68.124002
|
IFT-03-09
|
hep-ph
| null |
The one-loop effective potential calculated for a generic model that
originates from 5-dimensional theory reduced down to 4 dimensions is
considered. The cut-off and dimensional regularization schemes are discussed
and compared. It is demonstrated that the prescriptions are consistent with
each other and lead to the same physical consequences. Stability of the ground
state is discussed for a U(1) model that is supposed to mimic the Standard
Model extended to 5 dimensions. It has been shown that fermionic Kaluza-Klein
modes can dramatically influence the shape of the effective potential shifting
the instability scale even by several orders of magnitude.
|
[
{
"created": "Sat, 12 Apr 2003 15:07:17 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Sep 2003 13:32:44 GMT",
"version": "v2"
}
] |
2009-11-10
|
[
[
"Bucci",
"Patrizia",
""
],
[
"Grzadkowski",
"Bohdan",
""
]
] |
The one-loop effective potential calculated for a generic model that originates from 5-dimensional theory reduced down to 4 dimensions is considered. The cut-off and dimensional regularization schemes are discussed and compared. It is demonstrated that the prescriptions are consistent with each other and lead to the same physical consequences. Stability of the ground state is discussed for a U(1) model that is supposed to mimic the Standard Model extended to 5 dimensions. It has been shown that fermionic Kaluza-Klein modes can dramatically influence the shape of the effective potential shifting the instability scale even by several orders of magnitude.
|
hep-ph/9703456
|
Andrej Arbuzov
|
A.B. Arbuzov (Dubna, JINR), V.A. Astakhov (Novosibirsk, INP), A.V.
Fedorov (Dubna, JINR) G.V. Fedotovich (Novosibirsk, INP), E.A. Kuraev (Dubna,
JINR), N.P. Merenkov (Kharkov, FTI)
|
Radiative corrections for pion and kaon production at $e^+e^-$ colliders
of energies below 2 GeV
|
16 pages, LaTeX, epsfig.sty, 3 PostScript figures
|
JHEP 9710 (1997) 006
|
10.1088/1126-6708/1997/10/006
| null |
hep-ph
| null |
Processes of electron-positron annihilation into charged pions and kaons are
considered. Radiative corrections are taken into account exactly in the first
order and within the leading logarithmic approximation in higher orders. A
combined approach for accounting exact calculations and electron structure
functions is used. An accuracy of the calculation can be estimated about 0.2%.
|
[
{
"created": "Mon, 31 Mar 1997 06:22:53 GMT",
"version": "v1"
}
] |
2009-10-30
|
[
[
"Arbuzov",
"A. B.",
"",
"Dubna, JINR"
],
[
"Astakhov",
"V. A.",
"",
"Novosibirsk, INP"
],
[
"Fedorov",
"A. V.",
"",
"Dubna, JINR"
],
[
"Fedotovich",
"G. V.",
"",
"Novosibirsk, INP"
],
[
"Kuraev",
"E. A.",
"",
"Dubna,\n JINR"
],
[
"Merenkov",
"N. P.",
"",
"Kharkov, FTI"
]
] |
Processes of electron-positron annihilation into charged pions and kaons are considered. Radiative corrections are taken into account exactly in the first order and within the leading logarithmic approximation in higher orders. A combined approach for accounting exact calculations and electron structure functions is used. An accuracy of the calculation can be estimated about 0.2%.
|
hep-ph/9501279
|
Joaquim Matias
|
D.Espriu and J.Matias
|
RENORMALIZATION and the EQUIVALENCE THEOREM: ON-SHELL SCHEME
|
37 pages, TeX, 9 figures in separate uu-file are included (also
available in Postscript upon request to the Authors)
|
Phys.Rev. D52 (1995) 6530-6552
|
10.1103/PhysRevD.52.6530
|
UB-ECM-PF 94/16
|
hep-ph
| null |
We perform an exhaustive analysis of the Equivalence Theorem both in the
minimal Standard Model and in an Effective Electroweak Chiral Lagrangian up to
${\cal O}(p^4)$. We have considered the leading corrections to the usual
prescription consisting in just replacing longitudinally polarized $W$ or $Z$
by the corresponding Goldstone bosons. The corrections appear through an
overall constant multiplying the Goldstone boson amplitude as well as through
additional diagrams. By including them we can extend the domain of
applicability of the Equivalence Theorem, making it suitable for precision
tests of the symmetry breaking sector of the Standard Model. The on-shell
scheme has been used throughout. When considering the Equivalence Theorem in an
Effective Chiral lagrangian we analyze its domain of applicability, as well as
several side issues concerning gauge fixing, Ward identities, on-shell scheme
and matching conditions in the effective theory. We have analyzed in detail the
processes $W^+ W^- \to W^+W^-$ and $W^+W^+\to W^+W^+$ to illustrate the points
made.
|
[
{
"created": "Thu, 12 Jan 1995 11:28:11 GMT",
"version": "v1"
}
] |
2016-09-01
|
[
[
"Espriu",
"D.",
""
],
[
"Matias",
"J.",
""
]
] |
We perform an exhaustive analysis of the Equivalence Theorem both in the minimal Standard Model and in an Effective Electroweak Chiral Lagrangian up to ${\cal O}(p^4)$. We have considered the leading corrections to the usual prescription consisting in just replacing longitudinally polarized $W$ or $Z$ by the corresponding Goldstone bosons. The corrections appear through an overall constant multiplying the Goldstone boson amplitude as well as through additional diagrams. By including them we can extend the domain of applicability of the Equivalence Theorem, making it suitable for precision tests of the symmetry breaking sector of the Standard Model. The on-shell scheme has been used throughout. When considering the Equivalence Theorem in an Effective Chiral lagrangian we analyze its domain of applicability, as well as several side issues concerning gauge fixing, Ward identities, on-shell scheme and matching conditions in the effective theory. We have analyzed in detail the processes $W^+ W^- \to W^+W^-$ and $W^+W^+\to W^+W^+$ to illustrate the points made.
|
2006.14590
|
Farinaldo Queiroz
|
Manfred Lindner, Yann Mambrini, Tessio B. de Melo, Farinaldo S.
Queiroz
|
XENON1T Anomaly: A Light $Z^\prime$
|
6 pages, 1 figure
| null |
10.1016/j.physletb.2020.135972
|
IIP-2020
|
hep-ph astro-ph.HE hep-ex hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We have witnessed the beginning of an era where dark matter and neutrino
detectors can probe similar new physics phenomena. Motivated by the low-energy
electron recoil spectrum observed by the dark matter experiment, XENON1T, at
Gran Sasso laboratory, we interpret the observed signal not in terms of a dark
matter particle, but rather in the context of a new light $Z^\prime$ gauge
boson. We discuss how such a light $Z^\prime$ rises in a Two Higgs Doublet
Model augmented by an abelian gauge symmetry where neutrino masses and the
flavor problem are addressed, in agreement with neutrino-electron scattering
data.
|
[
{
"created": "Thu, 25 Jun 2020 17:35:41 GMT",
"version": "v1"
}
] |
2020-12-02
|
[
[
"Lindner",
"Manfred",
""
],
[
"Mambrini",
"Yann",
""
],
[
"de Melo",
"Tessio B.",
""
],
[
"Queiroz",
"Farinaldo S.",
""
]
] |
We have witnessed the beginning of an era where dark matter and neutrino detectors can probe similar new physics phenomena. Motivated by the low-energy electron recoil spectrum observed by the dark matter experiment, XENON1T, at Gran Sasso laboratory, we interpret the observed signal not in terms of a dark matter particle, but rather in the context of a new light $Z^\prime$ gauge boson. We discuss how such a light $Z^\prime$ rises in a Two Higgs Doublet Model augmented by an abelian gauge symmetry where neutrino masses and the flavor problem are addressed, in agreement with neutrino-electron scattering data.
|
hep-ph/9309251
| null |
R.W.Brown, M.E.Convery, M.A.Samuel
|
Zeroing in on more photons and gluons
|
26 pages
|
Phys.Rev. D49 (1994) 2290-2297
|
10.1103/PhysRevD.49.2290
|
CWRUTH-93-8
|
hep-ph
| null |
We discuss radiation zeros that are found in gauge tree amplitudes for
processes involving multi-photon emission. Previous results are clarified by
examples and by further elaboration. The conditions under which such amplitude
zeros occur are identical in form to those for the single-photon zeros, and all
radiated photons must travel parallel to each other. Any other neutral particle
likewise must be massless (e.g. gluon) and travel in that common direction. The
relevance to questions like gluon jet identification and computational checks
is considered. We use examples to show how certain multi-photon amplitudes
evade the zeros, and to demonstrate the connection to a more general result,
the decoupling of an external electromagnetic plane wave in the ``null zone".
Brief comments are made about zeros associated with other gauge-boson emission.
|
[
{
"created": "Thu, 9 Sep 1993 22:10:40 GMT",
"version": "v1"
}
] |
2009-10-22
|
[
[
"Brown",
"R. W.",
""
],
[
"Convery",
"M. E.",
""
],
[
"Samuel",
"M. A.",
""
]
] |
We discuss radiation zeros that are found in gauge tree amplitudes for processes involving multi-photon emission. Previous results are clarified by examples and by further elaboration. The conditions under which such amplitude zeros occur are identical in form to those for the single-photon zeros, and all radiated photons must travel parallel to each other. Any other neutral particle likewise must be massless (e.g. gluon) and travel in that common direction. The relevance to questions like gluon jet identification and computational checks is considered. We use examples to show how certain multi-photon amplitudes evade the zeros, and to demonstrate the connection to a more general result, the decoupling of an external electromagnetic plane wave in the ``null zone". Brief comments are made about zeros associated with other gauge-boson emission.
|
1207.6396
|
Alexander Studenikin
|
A. Grigoriev, A. Lokhov, A. Studenikin, A. Ternov
|
The effect of plasmon mass on spin light of neutrino in dense matter
|
8 pages, 2 figures, v2: typos corrected, discussions added
|
Phys.Lett.B 718, 512 (2012)
|
10.1016/j.physletb.2012.10.076
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We develop the theory of spin light of neutrino in matter ($SL\nu$) and
include the effect of plasma influence on the emitted photon. We use the
special technique based on exact solutions of particles wave equations in
matter to perform all the relevant calculations, and track how the plasmon mass
enters the process characteristics including the neutrino energy spectrum,
$SL\nu$ rate and power. The new feature it induces is the existence of the
process threshold for which we have found the exact expression and the
dependence of the rate and power on this threshold condition. The $SL\nu$
spatial distribution accounting for the above effects has been also obtained.
These results might be of interest in connection with the recently reported
hints of ultra-high energy neutrinos $E = 1 \div 10$ PeV observed by IceCube.
|
[
{
"created": "Thu, 26 Jul 2012 14:59:02 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Mar 2014 15:06:43 GMT",
"version": "v2"
}
] |
2015-06-05
|
[
[
"Grigoriev",
"A.",
""
],
[
"Lokhov",
"A.",
""
],
[
"Studenikin",
"A.",
""
],
[
"Ternov",
"A.",
""
]
] |
We develop the theory of spin light of neutrino in matter ($SL\nu$) and include the effect of plasma influence on the emitted photon. We use the special technique based on exact solutions of particles wave equations in matter to perform all the relevant calculations, and track how the plasmon mass enters the process characteristics including the neutrino energy spectrum, $SL\nu$ rate and power. The new feature it induces is the existence of the process threshold for which we have found the exact expression and the dependence of the rate and power on this threshold condition. The $SL\nu$ spatial distribution accounting for the above effects has been also obtained. These results might be of interest in connection with the recently reported hints of ultra-high energy neutrinos $E = 1 \div 10$ PeV observed by IceCube.
|
1809.08125
|
Victor Goncalves
|
V. P. Goncalves, B. D. Moreira
|
Probing the $X(4350)$ in $\gamma \gamma$ interactions at the LHC
|
5 pages, 2 figures, 2 tables
| null |
10.1140/epjc/s10052-018-6517-2
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The production of $X(4350)$ in the $\gamma \gamma$ interactions that occur in
proton-proton, proton-nucleus and nucleus-nucleus collisions at the CERN Large
Hadron Collider (LHC) is investigated and predictions for the kinematical
ranges probed by the ALICE and LHCb Collaborations are presented. We focus on
the $\gamma \gamma \rightarrow \phi J/\Psi$ process, which have been measured
by the Belle Collaboration, and present parameter free predictions for the
total cross sections at the LHC energies. Our results demonstrate that the
experimental study of this process is feasible and can be used to confirm or
not the existence of the $X(4350)$ state. Finally, for completeness, we present
predictions for the production of the $X(3915)$ state in the $\gamma \gamma
\rightarrow \omega J/\Psi$ process and show that this exotic state can also be
probed in $\gamma \gamma$ interactions at the LHC.
|
[
{
"created": "Fri, 21 Sep 2018 13:55:42 GMT",
"version": "v1"
}
] |
2019-01-30
|
[
[
"Goncalves",
"V. P.",
""
],
[
"Moreira",
"B. D.",
""
]
] |
The production of $X(4350)$ in the $\gamma \gamma$ interactions that occur in proton-proton, proton-nucleus and nucleus-nucleus collisions at the CERN Large Hadron Collider (LHC) is investigated and predictions for the kinematical ranges probed by the ALICE and LHCb Collaborations are presented. We focus on the $\gamma \gamma \rightarrow \phi J/\Psi$ process, which have been measured by the Belle Collaboration, and present parameter free predictions for the total cross sections at the LHC energies. Our results demonstrate that the experimental study of this process is feasible and can be used to confirm or not the existence of the $X(4350)$ state. Finally, for completeness, we present predictions for the production of the $X(3915)$ state in the $\gamma \gamma \rightarrow \omega J/\Psi$ process and show that this exotic state can also be probed in $\gamma \gamma$ interactions at the LHC.
|
hep-ph/9904498
|
Mariana Kirchbach
|
M. Kirchbach
|
Three-Flavor Symmetry of Hadrons Consistent With the Okubo-Zweig-Iizuka
Rule
| null |
Mod.Phys.Lett. A14 (1999) 81-92
|
10.1142/S0217732399000110
| null |
hep-ph nucl-th
| null |
It is argued that the only three-flavor symmetry which is consistent with the
Okubo-Zweig-Iizuka (OZI) rule, and is therefore dictated by the gluon gauge
dynamics, is the heavy c quark limit of a certain U(4)_F subgroup (called S_OZI
here) and defined as S_OZI= \lim_(m_c\to \Lambda_c) SU(2)_ud * SU(2)_cd * U(1)
with the two SU(2) groups acting in turn onto the 1st and 2nd quark generations
rather than Gell-Mann's eightfold SU(3)_F. Within this scheme the presence of
non-strange quarkonium components in the wave function of the physical eta and
f_1(1285) mesons appears necessarily through the violation of the OZI rule for
the pseudoscalar and axial vector mesons by the anomalous axial U(1)_A baryon
number current and not by a primordial octet flavor symmetry. The physical
observable which selects the S_OZI over the SU(3)_F scheme is the
non-isotriplet part of the neutral axial current. In the case of the S_OZI
symmetry the only non-isotriplet neutral axial current having a well defined
chiral limit is purely strange, while within the SU(3)_F framework it is the
octet axial current which is supposed to be partially conserved. Accordingly,
while in the latter case the tree level eta N coupling is of significant
strength, its almost vanishes in the former, in agreement with data, thus
confirming the relevance of the S_OZI symmetry.
|
[
{
"created": "Fri, 30 Apr 1999 01:00:31 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Kirchbach",
"M.",
""
]
] |
It is argued that the only three-flavor symmetry which is consistent with the Okubo-Zweig-Iizuka (OZI) rule, and is therefore dictated by the gluon gauge dynamics, is the heavy c quark limit of a certain U(4)_F subgroup (called S_OZI here) and defined as S_OZI= \lim_(m_c\to \Lambda_c) SU(2)_ud * SU(2)_cd * U(1) with the two SU(2) groups acting in turn onto the 1st and 2nd quark generations rather than Gell-Mann's eightfold SU(3)_F. Within this scheme the presence of non-strange quarkonium components in the wave function of the physical eta and f_1(1285) mesons appears necessarily through the violation of the OZI rule for the pseudoscalar and axial vector mesons by the anomalous axial U(1)_A baryon number current and not by a primordial octet flavor symmetry. The physical observable which selects the S_OZI over the SU(3)_F scheme is the non-isotriplet part of the neutral axial current. In the case of the S_OZI symmetry the only non-isotriplet neutral axial current having a well defined chiral limit is purely strange, while within the SU(3)_F framework it is the octet axial current which is supposed to be partially conserved. Accordingly, while in the latter case the tree level eta N coupling is of significant strength, its almost vanishes in the former, in agreement with data, thus confirming the relevance of the S_OZI symmetry.
|
hep-ph/0211159
|
Huitzu Tu
|
Huitzu Tu (DESY)
|
Mini Black Holes from Ultrahigh Energy Cosmic Neutrinos
|
Talk given at 10th International Conference On Supersymmety And
Unification Of Fundamental Interactions (SUSY02), Hamburg, Germany, 17-23 Jun
2002
| null | null |
DESY 02-197
|
hep-ph
| null |
We review the perhaps most exciting phenomenology of models with extra
spatial dimensions and Planck scale near TeV: the production of mini black
holes in ultrahigh energy particle collisions, and the discovery potential of
cosmic ray/cosmic neutrino experiments for black hole events before the start
of LHC.
|
[
{
"created": "Mon, 11 Nov 2002 18:36:25 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Tu",
"Huitzu",
"",
"DESY"
]
] |
We review the perhaps most exciting phenomenology of models with extra spatial dimensions and Planck scale near TeV: the production of mini black holes in ultrahigh energy particle collisions, and the discovery potential of cosmic ray/cosmic neutrino experiments for black hole events before the start of LHC.
|
hep-ph/0005046
|
Markov
|
Yu.A. Markov, M.A. Markova
|
The Boltzmann equation for colourless plasmons in hot QCD plasma.
Semiclassical approximation
|
41, LaTeX, minor changes, identical to published version
|
J.Phys.G27:1869-1904,2001
|
10.1088/0954-3899/27/9/302
|
ISDCT-00-1
|
hep-ph
| null |
Within the framework of the semiclassical approximation, we derive the
Boltzmann equation describing the dynamics of colorless plasmons in a hot QCD
plasma. The probability of the plasmon-plasmon scattering at the leading order
in the coupling constant is obtained. This probability is gauge-independent at
least in the class of the covariant and temporal gauges. It is noted that the
structure of the scattering kernel possesses important qualitative difference
from the corresponding one in the Abelian plasma, in spite of the fact that we
focused our study on the colorless soft excitations. It is shown that
four-plasmon decay is suppressed by the power of $g$ relative to the process of
nonlinear scattering of plasmons by thermal particles at the soft momentum
scale. It is stated that the former process becomes important in going to the
ultrasoft region of the momentum scale.
|
[
{
"created": "Fri, 5 May 2000 10:34:50 GMT",
"version": "v1"
},
{
"created": "Sat, 6 May 2000 03:52:40 GMT",
"version": "v2"
},
{
"created": "Wed, 26 Sep 2001 04:18:40 GMT",
"version": "v3"
}
] |
2008-11-26
|
[
[
"Markov",
"Yu. A.",
""
],
[
"Markova",
"M. A.",
""
]
] |
Within the framework of the semiclassical approximation, we derive the Boltzmann equation describing the dynamics of colorless plasmons in a hot QCD plasma. The probability of the plasmon-plasmon scattering at the leading order in the coupling constant is obtained. This probability is gauge-independent at least in the class of the covariant and temporal gauges. It is noted that the structure of the scattering kernel possesses important qualitative difference from the corresponding one in the Abelian plasma, in spite of the fact that we focused our study on the colorless soft excitations. It is shown that four-plasmon decay is suppressed by the power of $g$ relative to the process of nonlinear scattering of plasmons by thermal particles at the soft momentum scale. It is stated that the former process becomes important in going to the ultrasoft region of the momentum scale.
|
hep-ph/0304179
|
Melic
|
A. Khodjamirian, Th. Mannel, B. Melic
|
QCD Light-Cone Sum Rule Estimate of Charming Penguin Contributions in B
-> pi pi
|
12 pages, 5 figures included ; minor corrections
|
Phys.Lett. B571 (2003) 75-84; Phys.Lett. B572 (2003) 171-180
|
10.1016/j.physletb.2003.08.012
|
TTP03-12
|
hep-ph
| null |
Employing the QCD light-cone sum rule approach we calculate the B -> pi pi
hadronic matrix element of the current-current operator with c quarks in the
penguin topology (``charming penguin''). The dominant contribution to the sum
rule is due to the c-quark loop at short distances and is of O(alpha_s) with
respect to the factorizable B -> pi pi amplitude. The effects of soft gluons
are suppressed at least by O(alpha_s m_b^{-2}). Our result indicates that
sizable nonperturbative effects generated by charming penguins at finite m_b
are absent. The same is valid for the penguin contractions of the
current-current operators with light quarks.
|
[
{
"created": "Thu, 17 Apr 2003 21:44:47 GMT",
"version": "v1"
},
{
"created": "Wed, 7 May 2003 13:57:27 GMT",
"version": "v2"
}
] |
2015-06-25
|
[
[
"Khodjamirian",
"A.",
""
],
[
"Mannel",
"Th.",
""
],
[
"Melic",
"B.",
""
]
] |
Employing the QCD light-cone sum rule approach we calculate the B -> pi pi hadronic matrix element of the current-current operator with c quarks in the penguin topology (``charming penguin''). The dominant contribution to the sum rule is due to the c-quark loop at short distances and is of O(alpha_s) with respect to the factorizable B -> pi pi amplitude. The effects of soft gluons are suppressed at least by O(alpha_s m_b^{-2}). Our result indicates that sizable nonperturbative effects generated by charming penguins at finite m_b are absent. The same is valid for the penguin contractions of the current-current operators with light quarks.
|
hep-ph/9702230
|
Gerhard Schuler
|
Gerhard A. Schuler (CERN)
|
Quarkonium production: velocity-scaling rules and long-distance matrix
elements
|
17 pages, Latex, uses 12pt.sty and epsfig.sty, 2 figures
|
Int.J.Mod.Phys.A12:3951-3964,1997
|
10.1142/S0217751X97002103
|
CERN-TH/97-12
|
hep-ph
| null |
The hierarchy of long-distance matrix elements (MEs) for quarkonium
production depends on their scaling with the velocity $v$ of the heavy quark in
the bound state. Ranges for the velocities in various bound states and
uncertainties of colour-singlet MEs are estimated in a quark-potential model.
Different possibilities for the scaling with $v$ of the MEs are discussed; they
depend on the actual values of $v$ and the QCD scale. As an application, J/psi
polarization in e^+e^- annihilation is discussed. The first non-perturbative
estimates of colour-octet MEs are presented and compared with phenomenological
determinations. Finally, various predictions of prompt quarkonium production at
LEP are compared.
|
[
{
"created": "Mon, 3 Feb 1997 18:52:46 GMT",
"version": "v1"
}
] |
2011-04-15
|
[
[
"Schuler",
"Gerhard A.",
"",
"CERN"
]
] |
The hierarchy of long-distance matrix elements (MEs) for quarkonium production depends on their scaling with the velocity $v$ of the heavy quark in the bound state. Ranges for the velocities in various bound states and uncertainties of colour-singlet MEs are estimated in a quark-potential model. Different possibilities for the scaling with $v$ of the MEs are discussed; they depend on the actual values of $v$ and the QCD scale. As an application, J/psi polarization in e^+e^- annihilation is discussed. The first non-perturbative estimates of colour-octet MEs are presented and compared with phenomenological determinations. Finally, various predictions of prompt quarkonium production at LEP are compared.
|
1606.04781
|
Wolfgang Lucha
|
Wolfgang Lucha, Franz F. Sch\"oberl
|
Instantaneous Bethe-Salpeter View of Goldstone-Type Pseudoscalar Mesons
|
12 pages, 4 figures
|
Int. J. Mod. Phys. A 31 (2016) 1650202
|
10.1142/S0217751X1650202X
|
HEPHY-PUB 968/16
|
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Describing the lightest pseudoscalar mesons as bound states of quark and
antiquark within the framework of an instantaneous Bethe-Salpeter formalism
constructed such as to retain (in contrast to Salpeter's equation) as much
information on the relativistic effects provided by the full quark propagator
as conceivable allows for a surprisingly simple implementation of their near
masslessness mandatory for their interpretability as pseudo-Goldstone bosons
related to the spontaneous breaking of the chiral symmetries of quantum
chromodynamics.
|
[
{
"created": "Wed, 15 Jun 2016 14:18:13 GMT",
"version": "v1"
},
{
"created": "Sat, 3 Dec 2016 08:19:35 GMT",
"version": "v2"
}
] |
2016-12-28
|
[
[
"Lucha",
"Wolfgang",
""
],
[
"Schöberl",
"Franz F.",
""
]
] |
Describing the lightest pseudoscalar mesons as bound states of quark and antiquark within the framework of an instantaneous Bethe-Salpeter formalism constructed such as to retain (in contrast to Salpeter's equation) as much information on the relativistic effects provided by the full quark propagator as conceivable allows for a surprisingly simple implementation of their near masslessness mandatory for their interpretability as pseudo-Goldstone bosons related to the spontaneous breaking of the chiral symmetries of quantum chromodynamics.
|
hep-ph/0206112
|
Hans-Joachim Drescher
|
Hans-Joachim Drescher and Glennys R. Farrar
|
Dominant Contributions to Lateral Distribution Functions in Ultra-High
Energy Cosmic Ray Air Showers
|
19 pages, 21 figures
|
Astropart.Phys.19:235-244,2003
|
10.1016/S0927-6505(02)00203-7
| null |
hep-ph
| null |
In hadron induced air showers of highest energies (E> 1e18 eV), the lateral
distribution functions of electrons and muons are a superposition of many
separate electromagnetic sub-showers, initiated by meson decay at different
altitudes and energies. The lateral distribution function is the primary tool
for reconstructing the energy of the primary in a UHE cosmic ray shower, so
understanding it in detail is a prerequisite for having confidence in the
energy determination. We analyze in this paper the dominant contributions to
the ground level lateral distribution functions, as a function of the altitude
and energy at which the sub-showers are initiated. Far from the core, the
dominant contribution to the density of electrons comes from sub-showers
initiated at low altitudes and low energies (E<100 GeV). The dominant
sub-showers are initiated at large radial distance from the core and at a large
angle with respect to the main shower axis. This demonstrates the need for
careful treatment of low energy hadron physics modeling even for ultrahigh
energy primaries.
|
[
{
"created": "Wed, 12 Jun 2002 20:20:34 GMT",
"version": "v1"
}
] |
2011-05-23
|
[
[
"Drescher",
"Hans-Joachim",
""
],
[
"Farrar",
"Glennys R.",
""
]
] |
In hadron induced air showers of highest energies (E> 1e18 eV), the lateral distribution functions of electrons and muons are a superposition of many separate electromagnetic sub-showers, initiated by meson decay at different altitudes and energies. The lateral distribution function is the primary tool for reconstructing the energy of the primary in a UHE cosmic ray shower, so understanding it in detail is a prerequisite for having confidence in the energy determination. We analyze in this paper the dominant contributions to the ground level lateral distribution functions, as a function of the altitude and energy at which the sub-showers are initiated. Far from the core, the dominant contribution to the density of electrons comes from sub-showers initiated at low altitudes and low energies (E<100 GeV). The dominant sub-showers are initiated at large radial distance from the core and at a large angle with respect to the main shower axis. This demonstrates the need for careful treatment of low energy hadron physics modeling even for ultrahigh energy primaries.
|
1211.5883
|
Toshifumi Yamada
|
Shinya Kanemura, Eibun Senaha, Tetsuo Shindou, Toshifumi Yamada
|
Electroweak phase transition and Higgs boson couplings in the model
based on supersymmetric strong dynamics
| null | null |
10.1007/JHEP05(2013)066
|
UT-HET-75; KIAS-P12077; KU-PH-012; UT-12-39
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss a strongly-coupled extended Higgs sector with the 126 GeV Higgs
boson, which is a low-energy effective theory of the supersymmetric SU(2)$_H$
gauge thoery that causes confinement. In this effective theory, we study the
parameter region where electroweak phase transition is of strongly first order,
as required for successful electroweak baryogenesis. In such a parameter
region, the model has a Landau pole at the order of 10 TeV, which corresponds
to the confinement scale of the SU(2)$_H$ gauge theory. We find that the large
coupling constant which blows up at the Landau pole results in large
non-decoupling loop effects on low-energy observables, such as the
Higgs-photon-photon vertex and the triple Higgs boson vertex. As
phenomenological consequences of electroweak baryogenesis in our model, the
Higgs-to-diphoton branching ratio is about 20% smaller while the triple Higgs
boson coupling is more than about 20% larger than the standard model
predictions. Such deviations may be detectable in future collider experiments.
|
[
{
"created": "Mon, 26 Nov 2012 08:32:58 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Mar 2013 06:04:07 GMT",
"version": "v2"
},
{
"created": "Mon, 8 Apr 2013 05:40:46 GMT",
"version": "v3"
}
] |
2015-06-12
|
[
[
"Kanemura",
"Shinya",
""
],
[
"Senaha",
"Eibun",
""
],
[
"Shindou",
"Tetsuo",
""
],
[
"Yamada",
"Toshifumi",
""
]
] |
We discuss a strongly-coupled extended Higgs sector with the 126 GeV Higgs boson, which is a low-energy effective theory of the supersymmetric SU(2)$_H$ gauge thoery that causes confinement. In this effective theory, we study the parameter region where electroweak phase transition is of strongly first order, as required for successful electroweak baryogenesis. In such a parameter region, the model has a Landau pole at the order of 10 TeV, which corresponds to the confinement scale of the SU(2)$_H$ gauge theory. We find that the large coupling constant which blows up at the Landau pole results in large non-decoupling loop effects on low-energy observables, such as the Higgs-photon-photon vertex and the triple Higgs boson vertex. As phenomenological consequences of electroweak baryogenesis in our model, the Higgs-to-diphoton branching ratio is about 20% smaller while the triple Higgs boson coupling is more than about 20% larger than the standard model predictions. Such deviations may be detectable in future collider experiments.
|
hep-ph/0202214
|
Nobuchika Okada
|
Takeshi Fukuyama and Nobuchika Okada
|
Leptogenesis in models with multi-Higgs bosons
|
Latex 2e, 11 pages, 2 figures. Many parts in the original manuscript
have been revised, but conclusions are unchanged
|
Mod.Phys.Lett.A17:1725-1734,2002
|
10.1142/S0217732302008174
|
UMD-PP-02-036
|
hep-ph
| null |
We study the leptogenesis scenario in models with multi-Higgs doublets. It is
pointed out that the washing-out process through the effective dimension five
interactions, which has not been taken into account seriously in the
conventional scenario, can be effective, and the resultant baryon asymmetry can
be exponentially suppressed. This fact implies new possible scenario where the
observed baryon asymmetry is the remnant of the washed out lepton asymmetry
which was originally much larger than the one in the conventional scenario. Our
new scenario is applicable to some neutrino mass matrix models which predict
too large CP-violating parameter and makes them viable through the washing-out
process.
|
[
{
"created": "Fri, 22 Feb 2002 16:59:51 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Jun 2002 17:28:49 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Fukuyama",
"Takeshi",
""
],
[
"Okada",
"Nobuchika",
""
]
] |
We study the leptogenesis scenario in models with multi-Higgs doublets. It is pointed out that the washing-out process through the effective dimension five interactions, which has not been taken into account seriously in the conventional scenario, can be effective, and the resultant baryon asymmetry can be exponentially suppressed. This fact implies new possible scenario where the observed baryon asymmetry is the remnant of the washed out lepton asymmetry which was originally much larger than the one in the conventional scenario. Our new scenario is applicable to some neutrino mass matrix models which predict too large CP-violating parameter and makes them viable through the washing-out process.
|
1111.5712
|
Mitsutoshi Nakamura
|
Ryuichiro Kitano, Masafumi Kurachi, Mitsutoshi Nakamura, Naoto Yokoi
|
Spectral-Function Sum Rules in Supersymmetry Breaking Models
|
18 pages, 1 figure
| null |
10.1103/PhysRevD.85.055005
|
TU-893
|
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The technique of Weinberg's spectral-function sum rule is a powerful tool for
a study of models in which global symmetry is dynamically broken. It enables us
to convert information on the short-distance behavior of a theory to relations
among physical quantities which appear in the low-energy picture of the theory.
We apply such technique to general supersymmetry breaking models to derive new
sum rules.
|
[
{
"created": "Thu, 24 Nov 2011 10:39:40 GMT",
"version": "v1"
}
] |
2013-05-30
|
[
[
"Kitano",
"Ryuichiro",
""
],
[
"Kurachi",
"Masafumi",
""
],
[
"Nakamura",
"Mitsutoshi",
""
],
[
"Yokoi",
"Naoto",
""
]
] |
The technique of Weinberg's spectral-function sum rule is a powerful tool for a study of models in which global symmetry is dynamically broken. It enables us to convert information on the short-distance behavior of a theory to relations among physical quantities which appear in the low-energy picture of the theory. We apply such technique to general supersymmetry breaking models to derive new sum rules.
|
1012.2954
|
Elena Melkumova
|
E.Yu. Melkumova
|
Plasma graviton production in TeV-scale gravity
|
Talk at 16th International Symposium on Particles, Strings and
Cosmology (PASCOS 2010), Valencia, Spain, July 19-23, 2010
|
J.Phys.Conf.Ser.259:012035,2010
|
10.1088/1742-6596/259/1/012035
| null |
hep-ph gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We develop the theory of interaction of classical plasma with Kaluza-Klein
(KK) gravitons in the ADD model of TeV-scale gravity. Plasma is described
within the kinetic approach as the system of charged particles and Maxwell
field both confined on the brane. Interaction with multidimensional gravity
living in the bulk with $n$ compact extra dimensions is introduced within the
linearized theory. The KK gravitons emission rates are computed taking into
account plasma collective effects through the two-point correlation functions
of the fluctuations of the plasma energy-momentum tensor. Apart from known
mechanisms (such as bremsstrahlung and gravi-Primakoff effect) we find
essentially collective channels such as the coalescence of plasma waves into
gravitons which may be manifest in turbulent plasmas. Our results indicate that
commonly used rates of the KK gravitons production in stars and supernovae may
be underestimated.
|
[
{
"created": "Tue, 14 Dec 2010 07:58:20 GMT",
"version": "v1"
}
] |
2011-01-27
|
[
[
"Melkumova",
"E. Yu.",
""
]
] |
We develop the theory of interaction of classical plasma with Kaluza-Klein (KK) gravitons in the ADD model of TeV-scale gravity. Plasma is described within the kinetic approach as the system of charged particles and Maxwell field both confined on the brane. Interaction with multidimensional gravity living in the bulk with $n$ compact extra dimensions is introduced within the linearized theory. The KK gravitons emission rates are computed taking into account plasma collective effects through the two-point correlation functions of the fluctuations of the plasma energy-momentum tensor. Apart from known mechanisms (such as bremsstrahlung and gravi-Primakoff effect) we find essentially collective channels such as the coalescence of plasma waves into gravitons which may be manifest in turbulent plasmas. Our results indicate that commonly used rates of the KK gravitons production in stars and supernovae may be underestimated.
|
1801.08040
|
Pok Man Lo
|
Pok Man Lo, Micha{\l} Szyma\'nski, Krzysztof Redlich, and Chihiro
Sasaki
|
Polyakov loop fluctuations in the presence of external fields
|
9 pages, 5 figures, submitted to PRD
|
Phys. Rev. D 97, 114006 (2018)
|
10.1103/PhysRevD.97.114006
| null |
hep-ph hep-lat
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the implications of the spontaneous and explicit Z(3) center
symmetry breaking for the Polyakov loop susceptibilities. To this end, ratios
of the susceptibilities of the real and imaginary parts, as well as of the
modulus of the Polyakov loop are computed within an effective model using a
color group integration scheme. We show that the essential features of the
lattice QCD results of these ratios can be successfully captured by the
effective approach. Furthermore we discuss a novel scaling relation in one of
these ratios involving the explicit breaking field, volume, and temperature.
|
[
{
"created": "Wed, 24 Jan 2018 15:50:08 GMT",
"version": "v1"
}
] |
2018-06-13
|
[
[
"Lo",
"Pok Man",
""
],
[
"Szymański",
"Michał",
""
],
[
"Redlich",
"Krzysztof",
""
],
[
"Sasaki",
"Chihiro",
""
]
] |
We study the implications of the spontaneous and explicit Z(3) center symmetry breaking for the Polyakov loop susceptibilities. To this end, ratios of the susceptibilities of the real and imaginary parts, as well as of the modulus of the Polyakov loop are computed within an effective model using a color group integration scheme. We show that the essential features of the lattice QCD results of these ratios can be successfully captured by the effective approach. Furthermore we discuss a novel scaling relation in one of these ratios involving the explicit breaking field, volume, and temperature.
|
hep-ph/0110014
|
Jacques Soffer
|
K. Sasaki, J. Soffer and T. Uematsu
|
Positivity constraints on photon structure functions
|
10 pages, 1 ps figure, to appear Phys. Lett. B
|
Phys.Lett. B522 (2001) 22-26
|
10.1016/S0370-2693(01)01279-5
|
CPT-2001/P.4242, YNU-HEPTh-01-102, KUCP-195
|
hep-ph
| null |
We investigate the positivity constraints for the structure functions of both
virtual and real photon. From the Cauchy-Schwarz inequality we derive three
positivity conditions for the general virtual photon case, which reduce, in the
real photon case, to one condition relating the polarized and unpolarized
structure functions.
|
[
{
"created": "Sun, 30 Sep 2001 13:40:08 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Oct 2001 10:06:17 GMT",
"version": "v2"
}
] |
2009-11-07
|
[
[
"Sasaki",
"K.",
""
],
[
"Soffer",
"J.",
""
],
[
"Uematsu",
"T.",
""
]
] |
We investigate the positivity constraints for the structure functions of both virtual and real photon. From the Cauchy-Schwarz inequality we derive three positivity conditions for the general virtual photon case, which reduce, in the real photon case, to one condition relating the polarized and unpolarized structure functions.
|
0809.0945
|
Pavel Nadolsky
|
Pavel M. Nadolsky
|
Strange, charm, and bottom flavors in CTEQ global analysis
|
Contribution to the Proceedings of XVI International Workshop on
Deep-Inelastic Scattering and Related Subjects (DIS 2008), London, UK, 7-11
April, 2008; 5 pages
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
I discuss advances in the determination of strange, charm, and bottom quark
parton distribution functions obtained in the CTEQ6.5 and CTEQ6.6 global
analyses. These results affect electroweak precision observables and certain
new physics searches at the Large Hadron Collider. I focus, in particular, on
high-energy implications of the consistent treatment of heavy-quark threshold
effects in DIS in the general-mass factorization scheme; an independent
parametrization for the strangeness PDF; and the possible presence of
nonperturbative ("intrinsic") charm.
|
[
{
"created": "Fri, 5 Sep 2008 03:32:57 GMT",
"version": "v1"
},
{
"created": "Sun, 7 Sep 2008 16:43:02 GMT",
"version": "v2"
}
] |
2008-09-08
|
[
[
"Nadolsky",
"Pavel M.",
""
]
] |
I discuss advances in the determination of strange, charm, and bottom quark parton distribution functions obtained in the CTEQ6.5 and CTEQ6.6 global analyses. These results affect electroweak precision observables and certain new physics searches at the Large Hadron Collider. I focus, in particular, on high-energy implications of the consistent treatment of heavy-quark threshold effects in DIS in the general-mass factorization scheme; an independent parametrization for the strangeness PDF; and the possible presence of nonperturbative ("intrinsic") charm.
|
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