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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2312.17599 | Jingya Zhu | Weichao Li, Haoxue Qiao, Kun Wang, Jingya Zhu | Light dark matter confronted with the 95 GeV diphoton excess | 12 pages, 3 figures | null | null | null | hep-ph astro-ph.HE hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The correlation between Higgs-like scalars and light dark matter is an
interesting topic, especially now that a $125 GeV$ Higgs was discovered and
dark matter (DM) searches got negative results. The $95 GeV$ excess reported by
the CMS collaboration with $132 fb^{-1}$ data recently, and the DM search
results by XENONnT and LZ collaborations motivate us to revise that. In this
work, we study that in the GUT-scale constrained (GUTc) Next-to-Minimal
Supersymmetric Model (NMSSM), where most parameters are input at the GUT scale,
but with scalar and gaugino masses not unified there. In the calculation we
also consider other recent experimental constraints, such as Higgs data,
Supersymmetry (SUSY) searches, DM relic density, etc. After detailed analysis
and discussion, we find that: (i) The light DM can be bino- or
singlino-dominated, but can be mixed with minor components of Higgsino. (ii)
Both cases can get right relic density and sizable Higgs invisible decay, by
adjusting the dimensionless parameters $\lambda, \kappa$, or suitably mixing
with Higgsino. (iii) Both cases can have four funnel annihilation mechanisms,
i.e., annihilating through $Z, a_1, h_2, h_1$. (iv) Samples with right relic
density usually get weak signal of Higgs invisible decay at future lepton
collider, but the $95 GeV$ scalar can have sizable $b\bar{b}$ signal.
| [
{
"created": "Fri, 29 Dec 2023 13:27:42 GMT",
"version": "v1"
}
] | 2024-01-01 | [
[
"Li",
"Weichao",
""
],
[
"Qiao",
"Haoxue",
""
],
[
"Wang",
"Kun",
""
],
[
"Zhu",
"Jingya",
""
]
] | The correlation between Higgs-like scalars and light dark matter is an interesting topic, especially now that a $125 GeV$ Higgs was discovered and dark matter (DM) searches got negative results. The $95 GeV$ excess reported by the CMS collaboration with $132 fb^{-1}$ data recently, and the DM search results by XENONnT and LZ collaborations motivate us to revise that. In this work, we study that in the GUT-scale constrained (GUTc) Next-to-Minimal Supersymmetric Model (NMSSM), where most parameters are input at the GUT scale, but with scalar and gaugino masses not unified there. In the calculation we also consider other recent experimental constraints, such as Higgs data, Supersymmetry (SUSY) searches, DM relic density, etc. After detailed analysis and discussion, we find that: (i) The light DM can be bino- or singlino-dominated, but can be mixed with minor components of Higgsino. (ii) Both cases can get right relic density and sizable Higgs invisible decay, by adjusting the dimensionless parameters $\lambda, \kappa$, or suitably mixing with Higgsino. (iii) Both cases can have four funnel annihilation mechanisms, i.e., annihilating through $Z, a_1, h_2, h_1$. (iv) Samples with right relic density usually get weak signal of Higgs invisible decay at future lepton collider, but the $95 GeV$ scalar can have sizable $b\bar{b}$ signal. |
1607.05257 | Xabier Marcano | V. De Romeri, M.J. Herrero, X. Marcano, F. Scarcella | Lepton flavor violating Z decays: A promising window to low scale seesaw
neutrinos | 31 pages, 8 figures, 3 tables; references added; v4 matches the
manuscript published in PRD | Phys. Rev. D 95, 075028 (2017) | 10.1103/PhysRevD.95.075028 | IFT-UAM/CSIC-16-064, FTUAM-16-27 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we study the Lepton Flavor Violating $Z$ boson decays $Z \to
\tau \mu$ and $Z \to \tau e$ in the context of low scale seesaw models with new
heavy Majorana neutrinos whose masses could be reachable at the LHC. Our
computations of the decay rates are done in the particular realization given by
the Inverse Seesaw Model with six extra heavy neutrinos which are
quasi-degenerate in three pseudo-Dirac pairs. In particular, we focus on
scenarios that are built ad-hoc to produce suppressed rates in all the
processes involving $\mu$-$e$ transitions, given the fact that these are by far
the most strongly constrained by present data. We will fully explore the $Z \to
\tau \mu$ and $Z \to \tau e$ rates, together with a set of observables that we
find to be the most constraining ones, and we will conclude that sizable rates
of up to $2 \times 10^{-7}$, accessible at future colliders, can be reached in
this model for Majorana masses in the few TeV range, potentially reachable at
LHC.
| [
{
"created": "Mon, 18 Jul 2016 19:47:08 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Jul 2016 19:41:19 GMT",
"version": "v2"
},
{
"created": "Thu, 1 Dec 2016 20:55:30 GMT",
"version": "v3"
},
{
"created": "Mon, 24 Apr 2017 12:02:52 GMT",
"version": "v4"
}
] | 2017-04-26 | [
[
"De Romeri",
"V.",
""
],
[
"Herrero",
"M. J.",
""
],
[
"Marcano",
"X.",
""
],
[
"Scarcella",
"F.",
""
]
] | In this paper we study the Lepton Flavor Violating $Z$ boson decays $Z \to \tau \mu$ and $Z \to \tau e$ in the context of low scale seesaw models with new heavy Majorana neutrinos whose masses could be reachable at the LHC. Our computations of the decay rates are done in the particular realization given by the Inverse Seesaw Model with six extra heavy neutrinos which are quasi-degenerate in three pseudo-Dirac pairs. In particular, we focus on scenarios that are built ad-hoc to produce suppressed rates in all the processes involving $\mu$-$e$ transitions, given the fact that these are by far the most strongly constrained by present data. We will fully explore the $Z \to \tau \mu$ and $Z \to \tau e$ rates, together with a set of observables that we find to be the most constraining ones, and we will conclude that sizable rates of up to $2 \times 10^{-7}$, accessible at future colliders, can be reached in this model for Majorana masses in the few TeV range, potentially reachable at LHC. |
1111.6199 | N. D. Tracas | N.D.Tracas, G. Tsamis, N.D. Vlachos and G. Zoupanos | Coupling Reduction and the Higgs Mass | 17 pages, 16 figures | null | 10.1016/j.physletb.2012.03.016 | null | hep-ph hep-ex | http://creativecommons.org/licenses/by-nc-sa/3.0/ | Assuming the existence of a functional relation among the Standard Model (SM)
couplings gauge $\alpha_1$ and quartic $\lambda$, we determine the mass of the
Higgs particle. Similar considerations for the top and bottom Yukawa couplings
in the minimal supersymmetric SM lead to the prediction of a narrow window for
$\tan\beta$, one of the main parameters that determine the light Higgs mass.
| [
{
"created": "Sat, 26 Nov 2011 22:32:14 GMT",
"version": "v1"
}
] | 2015-06-03 | [
[
"Tracas",
"N. D.",
""
],
[
"Tsamis",
"G.",
""
],
[
"Vlachos",
"N. D.",
""
],
[
"Zoupanos",
"G.",
""
]
] | Assuming the existence of a functional relation among the Standard Model (SM) couplings gauge $\alpha_1$ and quartic $\lambda$, we determine the mass of the Higgs particle. Similar considerations for the top and bottom Yukawa couplings in the minimal supersymmetric SM lead to the prediction of a narrow window for $\tan\beta$, one of the main parameters that determine the light Higgs mass. |
2010.13084 | Najimuddin Khan | Pritam Das, Mrinal Kumar Das, Najimuddin Khan | Five-zero texture in neutrino-dark matter model within the framework of
minimal extended seesaw | 41 pages,6 Figures and 8 Tables | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study a model of neutrino and dark matter within the framework of a
minimal extended seesaw. This model is based on $A_4$ flavour symmetry along
with the discrete $Z_3\times Z_4$ symmetry to stabilize the dark matter and
construct desired mass matrices for neutrino mass. Five-zero textures are
imposed in the final $4\times4$ active-sterile mass matrix, which significantly
reduces free parameter in the model. Three right-handed neutrinos were
considered, two of them have nearly degenerate masses which help us to achieve
baryogenesis via resonant leptogenesis. A singlet fermion (sterile neutrino)
with mass $\sim\mathcal{O}$(eV) is also considered, and we are able to put
bounds on active-sterile mixing parameters via neutrino oscillation data.
Resonant enhancement of lepton asymmetry is studied at TeV scale, where we
discuss a few aspects of baryogenesis considering the flavour effects.
Possibility of improvement in effective mass from $0\nu\beta\beta$ in the
presence of a single generation of sterile neutrino flavour is also studied
within the fermion sector. In the scalar sector, the imaginary component of the
complex singlet scalar is behaving as a potential dark matter candidate and
simultaneously the real part of the complex scalar is associated with the
fermion sector for sterile mass generation. A broad region of dark matter mass
is analyzed from various annihilation processes, and the VEV of the complex
scalar plays a pivotal role to achieve the observed relic density at the right
ballpark.
| [
{
"created": "Sun, 25 Oct 2020 10:47:34 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Apr 2022 05:17:36 GMT",
"version": "v2"
}
] | 2022-04-29 | [
[
"Das",
"Pritam",
""
],
[
"Das",
"Mrinal Kumar",
""
],
[
"Khan",
"Najimuddin",
""
]
] | We study a model of neutrino and dark matter within the framework of a minimal extended seesaw. This model is based on $A_4$ flavour symmetry along with the discrete $Z_3\times Z_4$ symmetry to stabilize the dark matter and construct desired mass matrices for neutrino mass. Five-zero textures are imposed in the final $4\times4$ active-sterile mass matrix, which significantly reduces free parameter in the model. Three right-handed neutrinos were considered, two of them have nearly degenerate masses which help us to achieve baryogenesis via resonant leptogenesis. A singlet fermion (sterile neutrino) with mass $\sim\mathcal{O}$(eV) is also considered, and we are able to put bounds on active-sterile mixing parameters via neutrino oscillation data. Resonant enhancement of lepton asymmetry is studied at TeV scale, where we discuss a few aspects of baryogenesis considering the flavour effects. Possibility of improvement in effective mass from $0\nu\beta\beta$ in the presence of a single generation of sterile neutrino flavour is also studied within the fermion sector. In the scalar sector, the imaginary component of the complex singlet scalar is behaving as a potential dark matter candidate and simultaneously the real part of the complex scalar is associated with the fermion sector for sterile mass generation. A broad region of dark matter mass is analyzed from various annihilation processes, and the VEV of the complex scalar plays a pivotal role to achieve the observed relic density at the right ballpark. |
hep-ph/9705373 | null | J. Matias | A fermiophobic SU(2)xSU(2)xU(1) extension of the Standard Model | 4 pages, LaTeX. Contribution to the 32nd Rencontres de Moriond
``Electroweak Interactions and Unified Theories'' | null | null | DFPD 97/TH/22 | hep-ph | null | A new type of gauge extension of the SM is proposed. It is based on a
SU(2)xSU(2)xU(1) group with the peculiarity that the gauge bosons of the extra
SU(2) do not couple to fermions. This feature relaxes some of the constraints
on the masses of the new gauge bosons, leaving the possibility of having
lighter masses than in traditional extensions. The model exhibits several
interesting properties, it is anomaly free and at tree level it does not have
FCNC while loop induced effects are strongly suppressed. Also, from the
analysis of $\Delta \rho$ at one loop, two configurations for the vevs giving
rise to a screening phenomenon are identified. One of these configurations can
also be related with the Bess model. A tree level fit to the most recent
electroweak data is performed confirming the possibility of having new light
gauge boson masses. The constraints coming from different FCNC processes like
$b \to s \gamma$, $B_{0}-{\bar B}_{0}$ and $K_{0}-{\bar K}_{0}$ mixing are also
taken into account. Finally, a generalization of this model for the case of
having several extra copies of SU(2) groups is commented, focusing on the
presence of screening configurations and the corresponding mass spectrum.
| [
{
"created": "Wed, 21 May 1997 12:14:55 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Matias",
"J.",
""
]
] | A new type of gauge extension of the SM is proposed. It is based on a SU(2)xSU(2)xU(1) group with the peculiarity that the gauge bosons of the extra SU(2) do not couple to fermions. This feature relaxes some of the constraints on the masses of the new gauge bosons, leaving the possibility of having lighter masses than in traditional extensions. The model exhibits several interesting properties, it is anomaly free and at tree level it does not have FCNC while loop induced effects are strongly suppressed. Also, from the analysis of $\Delta \rho$ at one loop, two configurations for the vevs giving rise to a screening phenomenon are identified. One of these configurations can also be related with the Bess model. A tree level fit to the most recent electroweak data is performed confirming the possibility of having new light gauge boson masses. The constraints coming from different FCNC processes like $b \to s \gamma$, $B_{0}-{\bar B}_{0}$ and $K_{0}-{\bar K}_{0}$ mixing are also taken into account. Finally, a generalization of this model for the case of having several extra copies of SU(2) groups is commented, focusing on the presence of screening configurations and the corresponding mass spectrum. |
1404.0795 | Nikonov Victor A. | V.V. Anisovich, K.V. Nikonov, V.A. Nikonov, J. Nyiri | Proton-proton, pion-proton and pion-pion diffractive collisions at
ultra-high energies | 14 pages. arXiv admin note: text overlap with arXiv:1310.2839 | null | 10.1142/S0217751X14500961 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The LHC energies are those at which the asymptotic regime in hadron-hadron
diffractive collisions ($pp,\pi p,\pi\pi$) might be switched on. Based on
results of the Dakhno-Nikonov eikonal model which is a generalization of the
Good-Walker eikonal approach for a continuous set of channels, we present a
picture for transformation of the constituent quark mode to the black disk one.
In the black disk mode ($\sqrt s \geq 10$ TeV) we have a growth of the
logarithm squared type for total and elastic cross sections,
$\sigma_{tot}\sim\ln^2s$ and $\sigma_{el}\sim\ln^2s$, and $(\tau={\bf
q}_\perp^2\sigma_{tot})$-scaling for diffractive scattering and diffractive
dissociation of hadrons. The diffractive dissociation cross section grows as
$\sigma_{D}\sim\ln{s}$, $\sigma_{DD}\sim\ln{s}$, and their relative
contribution tends to zero: $\sigma_{D}/\sigma_{tot}\to 0$,
$\sigma_{DD}/\sigma_{tot}\to 0$. Asymptotic characteristics of diffractive and
total cross sections are universal, and this results in the asymptotical
equality of cross sections for all types of hadrons (the Gribov's
universality). The energy scale for switching on the asymptotic mode is
estimated for different processes.
| [
{
"created": "Thu, 3 Apr 2014 08:06:59 GMT",
"version": "v1"
}
] | 2015-06-19 | [
[
"Anisovich",
"V. V.",
""
],
[
"Nikonov",
"K. V.",
""
],
[
"Nikonov",
"V. A.",
""
],
[
"Nyiri",
"J.",
""
]
] | The LHC energies are those at which the asymptotic regime in hadron-hadron diffractive collisions ($pp,\pi p,\pi\pi$) might be switched on. Based on results of the Dakhno-Nikonov eikonal model which is a generalization of the Good-Walker eikonal approach for a continuous set of channels, we present a picture for transformation of the constituent quark mode to the black disk one. In the black disk mode ($\sqrt s \geq 10$ TeV) we have a growth of the logarithm squared type for total and elastic cross sections, $\sigma_{tot}\sim\ln^2s$ and $\sigma_{el}\sim\ln^2s$, and $(\tau={\bf q}_\perp^2\sigma_{tot})$-scaling for diffractive scattering and diffractive dissociation of hadrons. The diffractive dissociation cross section grows as $\sigma_{D}\sim\ln{s}$, $\sigma_{DD}\sim\ln{s}$, and their relative contribution tends to zero: $\sigma_{D}/\sigma_{tot}\to 0$, $\sigma_{DD}/\sigma_{tot}\to 0$. Asymptotic characteristics of diffractive and total cross sections are universal, and this results in the asymptotical equality of cross sections for all types of hadrons (the Gribov's universality). The energy scale for switching on the asymptotic mode is estimated for different processes. |
hep-ph/0608225 | Ikaros Bigi | I.I. Bigi | The Physics of Beauty (& Charm [& $\tau$]) at the LHC and in the Era of
the LHC | 18 pages, 1 figure; Invited Plenary Lecture given at {\em Physics at
LHC}, Cracow, Poland, July 2006 | Acta Phys.Polon.B38:867-886,2007 | null | UND-HEP-06-BIG07 | hep-ph | null | The recent successes of the SM do not weaken the arguments in favour of New
Physics residing at the TeV scale. Finding and identifying it represents the
prime challenge for a generation of high energy physicists. To differentiate
between different scenarios of New Physics we need to analyze their impact on
flavour dynamics. A continuing comprehensive program of heavy flavour studies
instrumentalizing the high sensitivity of \cp analyses is intrinsically
connected to LHC's core mission. In B decays we can typically expect no more
than moderate deviations from SM predictions. $B_s$ transitions provide an {\em
autonomous} access to New Physics not prejudiced by $\Delta M(B_s)|_{exp}\simeq
\Delta M(B_s)|_{SM}$. Dedicated studies of charm and $\tau$ decays offer unique
opportunities to observe New Physics. One challenge is whether LHCb will be
able to exploit LHC's huge charm production rate to probe for \cp asymmetries.
Likewise, to which degree ATLAS/CMS can contribute to $B$ physics and to
searches for $\tau \to 3l$. Yet to saturate the discovery potential for New
Physics in beauty, charm and $\tau$ decays we will need a comprehensive high
quality data base that only a Super-Flavour Factory can provide.
| [
{
"created": "Sun, 20 Aug 2006 16:58:08 GMT",
"version": "v1"
}
] | 2011-03-23 | [
[
"Bigi",
"I. I.",
""
]
] | The recent successes of the SM do not weaken the arguments in favour of New Physics residing at the TeV scale. Finding and identifying it represents the prime challenge for a generation of high energy physicists. To differentiate between different scenarios of New Physics we need to analyze their impact on flavour dynamics. A continuing comprehensive program of heavy flavour studies instrumentalizing the high sensitivity of \cp analyses is intrinsically connected to LHC's core mission. In B decays we can typically expect no more than moderate deviations from SM predictions. $B_s$ transitions provide an {\em autonomous} access to New Physics not prejudiced by $\Delta M(B_s)|_{exp}\simeq \Delta M(B_s)|_{SM}$. Dedicated studies of charm and $\tau$ decays offer unique opportunities to observe New Physics. One challenge is whether LHCb will be able to exploit LHC's huge charm production rate to probe for \cp asymmetries. Likewise, to which degree ATLAS/CMS can contribute to $B$ physics and to searches for $\tau \to 3l$. Yet to saturate the discovery potential for New Physics in beauty, charm and $\tau$ decays we will need a comprehensive high quality data base that only a Super-Flavour Factory can provide. |
2307.01145 | Mikhail Gorchtein | Mikhail Gorchtein, Chien-Yeah Seng | The Standard Model theory of neutron beta decay | Invited review article for Universe, Special Issue: Neutron lifetime
26 pages; Accepted version | Universe 2023, 9(9), 422 | 10.3390/universe9090422 | null | hep-ph nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review the status of the Standard Model theory of neutron beta decay.
Particular emphasis is put on the recent developments in the electroweak
radiative corrections. Given that some existing approaches give slightly
different results, we thoroughly review the origin of discrepancies, and
provide our recommended value for the radiative correction to the neutron and
nuclear decay rates. The use of dispersion relation, lattice Quantum
Chromodynamics and effective field theory framework allows for high-precision
theory calculations at the level of $10^{-4}$, turning neutron beta decay into
a powerful tool to search for new physics, complementary to high-energy
collider experiments. We offer an outlook to the future improvements.
| [
{
"created": "Mon, 3 Jul 2023 16:35:11 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Jul 2023 14:06:25 GMT",
"version": "v2"
},
{
"created": "Tue, 31 Oct 2023 15:05:59 GMT",
"version": "v3"
}
] | 2023-11-01 | [
[
"Gorchtein",
"Mikhail",
""
],
[
"Seng",
"Chien-Yeah",
""
]
] | We review the status of the Standard Model theory of neutron beta decay. Particular emphasis is put on the recent developments in the electroweak radiative corrections. Given that some existing approaches give slightly different results, we thoroughly review the origin of discrepancies, and provide our recommended value for the radiative correction to the neutron and nuclear decay rates. The use of dispersion relation, lattice Quantum Chromodynamics and effective field theory framework allows for high-precision theory calculations at the level of $10^{-4}$, turning neutron beta decay into a powerful tool to search for new physics, complementary to high-energy collider experiments. We offer an outlook to the future improvements. |
2104.09628 | Tetsuo Shindou | Yoko Irie, Osamu Seto and Tetsuo Shindou | Lepton Flavour Violation in a radiative neutrino mass model with the
asymmetric Yukawa structure | 13 pages, 7 figures | null | 10.1016/j.physletb.2021.136486 | EPHOU-21-009, KU-PH-028 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Though models with the radiative neutrino mass generation are
phenomenologically attractive, the complicated relationship between the flavour
structure of additional Yukawa matrices and the neutrino mass matrix sometimes
is a barrier to explore the models. We introduce a simple prescription to
analyze the relation in a class of models with the asymmetric Yukawa structure.
We then apply the treatment to the Zee-Babu model as a concrete example of the
class and discuss the phenomenological consequences of the model. The combined
studies among the neutrino physics, the lepton flavour violation, and the
search for the new particles at the collider experiments provide the anatomy of
the Zee-Babu model.
| [
{
"created": "Mon, 19 Apr 2021 20:44:03 GMT",
"version": "v1"
}
] | 2021-07-28 | [
[
"Irie",
"Yoko",
""
],
[
"Seto",
"Osamu",
""
],
[
"Shindou",
"Tetsuo",
""
]
] | Though models with the radiative neutrino mass generation are phenomenologically attractive, the complicated relationship between the flavour structure of additional Yukawa matrices and the neutrino mass matrix sometimes is a barrier to explore the models. We introduce a simple prescription to analyze the relation in a class of models with the asymmetric Yukawa structure. We then apply the treatment to the Zee-Babu model as a concrete example of the class and discuss the phenomenological consequences of the model. The combined studies among the neutrino physics, the lepton flavour violation, and the search for the new particles at the collider experiments provide the anatomy of the Zee-Babu model. |
hep-ph/9309248 | Ed Stoeffhaas | K.Hagiawara and M.L.Stong | Probing the Scalar Sector in $e^+ e^- \rightarrow f \bar{f} H$ | Revtex file (can run version 2 or 3), 20 pages. 7 figures available
by fax or conventional mail. MAD/PH/734, KEK-TH-360 | Z.Phys.C62:99-108,1994 | 10.1007/BF01559529 | null | hep-ph | null | We study possible deviations from the Standard Model in the reaction $e^+e^-
\to Z\phi$, where $\phi$ denotes a spinless neutral boson. We show how the $Z$
decay angular correlation can be used to extract detailed information on the
$\phi$ couplings, such as the parity of $\phi$, radiatively induced form factor
effects and possible CP violation in the scalar sector. Consequences of gauge
invariant dimension six operators are discussed as an example.
| [
{
"created": "Thu, 9 Sep 1993 16:36:29 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Hagiawara",
"K.",
""
],
[
"Stong",
"M. L.",
""
]
] | We study possible deviations from the Standard Model in the reaction $e^+e^- \to Z\phi$, where $\phi$ denotes a spinless neutral boson. We show how the $Z$ decay angular correlation can be used to extract detailed information on the $\phi$ couplings, such as the parity of $\phi$, radiatively induced form factor effects and possible CP violation in the scalar sector. Consequences of gauge invariant dimension six operators are discussed as an example. |
1909.10626 | Yu Shi | Yu Shi, Ji-Chong Yang | Standard Model of Particle Physics Violating Crypto-Nonlocal Realism | 28 pages | European Physical Journal C volume 80, Article number: 861 (2020) | 10.1140/epjc/s10052-020-08430-9 | null | hep-ph quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has been well established that quantum mechanics (QM) violates Bell
inequalities (BI), which are consequences of local realism (LR). Remarkably QM
also violates Leggett inequalities (LI), which are consequences of a class of
nonlocal realism called crypto-nonlocal realism (CNR). Both LR and CNR assume
that measurement outcomes are determined by preexisting objective properties,
as well as hidden variables (HV) not considered in QM. We extend CNR and LI to
include the case that the measurement settings are not externally fixed, but
determined by hidden variables (HV). We derive a new version of LI, which is
then shown to be violated by entangled $B_d$ mesons, if
charge-conjugation-parity (CP) symmetry is indirectly violated, as indeed
established. The experimental result is quantitatively estimated by using the
indirect CP violation parameter, and the maximum of a suitably defined relative
violation is about $2.7\%$. Our work implies that standard model (SM) of
particle physics violates CNR. Our LI can also be tested in other systems such
as photon polarizations.
| [
{
"created": "Mon, 23 Sep 2019 21:33:05 GMT",
"version": "v1"
},
{
"created": "Fri, 25 Sep 2020 06:34:31 GMT",
"version": "v2"
}
] | 2020-09-28 | [
[
"Shi",
"Yu",
""
],
[
"Yang",
"Ji-Chong",
""
]
] | It has been well established that quantum mechanics (QM) violates Bell inequalities (BI), which are consequences of local realism (LR). Remarkably QM also violates Leggett inequalities (LI), which are consequences of a class of nonlocal realism called crypto-nonlocal realism (CNR). Both LR and CNR assume that measurement outcomes are determined by preexisting objective properties, as well as hidden variables (HV) not considered in QM. We extend CNR and LI to include the case that the measurement settings are not externally fixed, but determined by hidden variables (HV). We derive a new version of LI, which is then shown to be violated by entangled $B_d$ mesons, if charge-conjugation-parity (CP) symmetry is indirectly violated, as indeed established. The experimental result is quantitatively estimated by using the indirect CP violation parameter, and the maximum of a suitably defined relative violation is about $2.7\%$. Our work implies that standard model (SM) of particle physics violates CNR. Our LI can also be tested in other systems such as photon polarizations. |
hep-ph/0002097 | Vladimir Baier | V. N. Baier and V. M. Katkov | Influence of a medium on pair photoproduction and bremsstrahlung | 22 pages, 3 figures, Latex | Phys.Rev. D62 (2000) 036008 | 10.1103/PhysRevD.62.036008 | null | hep-ph | null | The creation of electron-positron pair by a photon and the bremsstrahlung of
an electron in a medium are considered in high-energy region, where influence
of the multiple scattering on the processes (the Landau-Pomeranchuk-Migdal
(LPM) effect) becomes essential. The pair photoproduction probability is
calculated with an accuracy up to the "next to leading logarithm". The integral
characteristics: the radiation length and the total probability of pair
photoproduction are analyzed under influence of the LPM effect, and the
asymptotic expansions of these characteristics are derived.
| [
{
"created": "Wed, 9 Feb 2000 08:05:43 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Baier",
"V. N.",
""
],
[
"Katkov",
"V. M.",
""
]
] | The creation of electron-positron pair by a photon and the bremsstrahlung of an electron in a medium are considered in high-energy region, where influence of the multiple scattering on the processes (the Landau-Pomeranchuk-Migdal (LPM) effect) becomes essential. The pair photoproduction probability is calculated with an accuracy up to the "next to leading logarithm". The integral characteristics: the radiation length and the total probability of pair photoproduction are analyzed under influence of the LPM effect, and the asymptotic expansions of these characteristics are derived. |
hep-ph/9608478 | Yakov Azimov | Ya.I. Azimov, V.L.Rappoport, V.V. Sarantsev (Petersburg Nuclear
Physics Institute) | Problem of the Complete Measurement for CP-violating Parameters in
Neutral B-meson Decays | 12 pages, no figures; some small errors are corrected, publication
reference is appended | Z.Phys.A356:437-442,1997 | 10.1007/s002180050199 | PNPI-2134 | hep-ph | null | Phenomenological CP-violating parameters in decays of neutral B-mesons are
discussed. Special attention is given to the degree of their measurability. We
emphasize important role of the sign of $\Delta m_B$ and suggest how it could
be determined experimentally.
| [
{
"created": "Fri, 30 Aug 1996 10:40:55 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Feb 1997 09:38:42 GMT",
"version": "v2"
}
] | 2016-09-06 | [
[
"Azimov",
"Ya. I.",
"",
"Petersburg Nuclear\n Physics Institute"
],
[
"Rappoport",
"V. L.",
"",
"Petersburg Nuclear\n Physics Institute"
],
[
"Sarantsev",
"V. V.",
"",
"Petersburg Nuclear\n Physics Institute"
]
] | Phenomenological CP-violating parameters in decays of neutral B-mesons are discussed. Special attention is given to the degree of their measurability. We emphasize important role of the sign of $\Delta m_B$ and suggest how it could be determined experimentally. |
hep-ph/9701281 | Pirner | H.J. Pirner, M. Wachs (Heidelberg) | Thermodynamics of Constituent Quarks | 24 pages, 5 Postscript figures, uses article.sty, epsf.sty,
epsfig.sty | null | 10.1016/S0375-9474(97)00061-4 | null | hep-ph | null | We investigate the thermal behavior of quarks and antiquarks interacting via
a temperature-dependent linear potential. The quarks are constituent quarks
with dynamically generated masses from the background linear $\sigma$-model.We
find a transition from a system of bound mesons to a correlated quark gas at
the same temperature as the chiral transition temperature.
| [
{
"created": "Mon, 13 Jan 1997 16:26:31 GMT",
"version": "v1"
}
] | 2016-09-06 | [
[
"Pirner",
"H. J.",
"",
"Heidelberg"
],
[
"Wachs",
"M.",
"",
"Heidelberg"
]
] | We investigate the thermal behavior of quarks and antiquarks interacting via a temperature-dependent linear potential. The quarks are constituent quarks with dynamically generated masses from the background linear $\sigma$-model.We find a transition from a system of bound mesons to a correlated quark gas at the same temperature as the chiral transition temperature. |
hep-ph/9412389 | null | Danilo Villarroel and Rodrigo Rivera | Interference Rate of Radiation of 2 Charges in Circular Motion | 16 pages and 4 figs. Latex. Figures available from
rivera@newton.fis.utfsm.cl | null | null | null | hep-ph | null | We present an exact formula for the computation of the interference rate of
radiation in the case of two charges revolving with constant angular velocity
at opposite ends of a diameter in a fixed circle. The formula is valid for
arbitrary velocities of the charges, and can be easily studied by numerical
methods, even for velocities very close to the velocity of light. For
ultrarelativistic motion, the interference rate of radiation behaves as
$\ln(1-v^2/c^2)^{-1/2}$, which contrasts with the behavior $(1 - v^2/c^2)^{-2}$
for the rate of radiation for one charge in circular motion. This is the first
exact calculation for the interference rate of radiation of two relativistic
charges, and it is useful in connection with the old controversy about the
correctness of the Lorentz-Dirac equations of motion for more than one charge.
| [
{
"created": "Fri, 30 Dec 1994 03:31:36 GMT",
"version": "v1"
}
] | 2009-09-25 | [
[
"Villarroel",
"Danilo",
""
],
[
"Rivera",
"Rodrigo",
""
]
] | We present an exact formula for the computation of the interference rate of radiation in the case of two charges revolving with constant angular velocity at opposite ends of a diameter in a fixed circle. The formula is valid for arbitrary velocities of the charges, and can be easily studied by numerical methods, even for velocities very close to the velocity of light. For ultrarelativistic motion, the interference rate of radiation behaves as $\ln(1-v^2/c^2)^{-1/2}$, which contrasts with the behavior $(1 - v^2/c^2)^{-2}$ for the rate of radiation for one charge in circular motion. This is the first exact calculation for the interference rate of radiation of two relativistic charges, and it is useful in connection with the old controversy about the correctness of the Lorentz-Dirac equations of motion for more than one charge. |
1411.4588 | Ozan Erdo\u{g}an | Ozan Erdo\u{g}an and George Sterman | Ultraviolet divergences and factorization for coordinate-space
amplitudes | 51 pages, 9 figures, minor editing to correspond to published version | Phys. Rev. D 91, 065033 (2015) | 10.1103/PhysRevD.91.065033 | YITP-SB-14-15, Cavendish-HEP-14/12 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the coordinate-space matrix elements that correspond to
fixed-angle scattering amplitudes involving partons and Wilson lines in
coordinate space, working in Feynman gauge. In coordinate space, both collinear
and short-distance limits produce ultraviolet divergences. We classify
singularities in coordinate space, and identify neighborhoods associated
unambiguously with individual subspaces (pinch surfaces) where the integrals
are singular. The set of such regions is finite for any diagram. Within each of
these regions, coordinate-space soft-collinear and hard-collinear
approximations reproduce singular behavior. Based on this classification of
regions and approximations, we develop a series of nested subtraction
approximations by analogy to the formalism in momentum space. This enables us
to rewrite each amplitude as a sum of terms to which gauge theory Ward
identities can be applied, factorizing them into hard, jet and soft factors,
and to confirm the multiplicative renormalizability of products of lightlike
Wilson lines. We study in some detail the simplest case, the color-singlet cusp
linking two Wilson lines, and show that the logarithm of this amplitude, which
is a sum of diagrams known as webs, is closely related to the corresponding
subtracted amplitude order by order in perturbation theory. This enables us to
confirm that the logarithm of the cusp can be written as the integral of an
ultraviolet-finite function over a surface. We study to what extent this result
generalizes to amplitudes involving multiple Wilson lines.
| [
{
"created": "Mon, 17 Nov 2014 19:00:40 GMT",
"version": "v1"
},
{
"created": "Fri, 1 May 2015 13:02:17 GMT",
"version": "v2"
}
] | 2015-05-04 | [
[
"Erdoğan",
"Ozan",
""
],
[
"Sterman",
"George",
""
]
] | We consider the coordinate-space matrix elements that correspond to fixed-angle scattering amplitudes involving partons and Wilson lines in coordinate space, working in Feynman gauge. In coordinate space, both collinear and short-distance limits produce ultraviolet divergences. We classify singularities in coordinate space, and identify neighborhoods associated unambiguously with individual subspaces (pinch surfaces) where the integrals are singular. The set of such regions is finite for any diagram. Within each of these regions, coordinate-space soft-collinear and hard-collinear approximations reproduce singular behavior. Based on this classification of regions and approximations, we develop a series of nested subtraction approximations by analogy to the formalism in momentum space. This enables us to rewrite each amplitude as a sum of terms to which gauge theory Ward identities can be applied, factorizing them into hard, jet and soft factors, and to confirm the multiplicative renormalizability of products of lightlike Wilson lines. We study in some detail the simplest case, the color-singlet cusp linking two Wilson lines, and show that the logarithm of this amplitude, which is a sum of diagrams known as webs, is closely related to the corresponding subtracted amplitude order by order in perturbation theory. This enables us to confirm that the logarithm of the cusp can be written as the integral of an ultraviolet-finite function over a surface. We study to what extent this result generalizes to amplitudes involving multiple Wilson lines. |
hep-ph/9309293 | null | W.A. Bardeen, M. Carena, S. Pokorski and C.E.M. Wagner | Infrared Fixed Point Solution for the Top Quark Mass and Unification of
Couplings in the MSSM | 11 pages, 3 figures (not included), MPI-Ph/93-58 | Phys.Lett.B320:110-116,1994 | 10.1016/0370-2693(94)90832-X | null | hep-ph | null | We analyze the implications of the infrared quasi fixed point solution for
the top quark mass in the Minimal Supersymmetric Standard Model. This solution
could explain in a natural way the relatively large value of the top quark mass
and, if confirmed experimentally, may be suggestive of the onset of
nonperturbative physics at very high energy scales. In the framework of grand
unification, the expected bottom quark - tau lepton Yukawa coupling unification
is very sensitive to the fixed point structure of the top quark mass. For the
presently allowed values of the electroweak parameters and the bottom quark
mass, the Yukawa coupling unification implies that the top quark mass must be
within ten percent of its fixed point values.
| [
{
"created": "Mon, 20 Sep 1993 15:37:31 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Bardeen",
"W. A.",
""
],
[
"Carena",
"M.",
""
],
[
"Pokorski",
"S.",
""
],
[
"Wagner",
"C. E. M.",
""
]
] | We analyze the implications of the infrared quasi fixed point solution for the top quark mass in the Minimal Supersymmetric Standard Model. This solution could explain in a natural way the relatively large value of the top quark mass and, if confirmed experimentally, may be suggestive of the onset of nonperturbative physics at very high energy scales. In the framework of grand unification, the expected bottom quark - tau lepton Yukawa coupling unification is very sensitive to the fixed point structure of the top quark mass. For the presently allowed values of the electroweak parameters and the bottom quark mass, the Yukawa coupling unification implies that the top quark mass must be within ten percent of its fixed point values. |
1005.5535 | Peng Sun | Peng Sun, Gang Hao, Cong-Feng Qiao | Pseudoscalar Quarkonium Exclusive Decays to Vector Meson Pair | 14 pages, 1 figure | Phys.Lett.B702:49-54,2011 | 10.1016/j.physletb.2011.06.060 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The pseudoscalar quarkonia exclusive decays to light mesons still poses a
challenge to the theoretical understanding of quarkonium properties in decay.
In this work, we evaluate the processes of pseudoscalar heavy quarkonium decays
into vector meson pairs, especially the helicity suppressed processes of
$\eta_b\rightarrow J/\psi J/\psi$ and $\eta_c\rightarrow VV$. In the frame of
NRQCD, the branching fraction of $Br[\eta_b\rightarrow J/\psi J/\psi]$ are
evaluated at the next-to-leading order of perturbative QCD; and within the
light-cone distribution formalism, we calculate also the higher twist effects
in these processes. Numerical results show that the higher twist terms
contribute more than what from the NLO QCD corrections in the process of
$\eta_b\rightarrow J/\psi J/\psi$. It is found that the experimental results on
$\eta_c\rightarrow VV$ are hard to be understood by merely the quark model and
perturbative QCD calculation.
| [
{
"created": "Sun, 30 May 2010 14:30:54 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Jun 2010 16:44:38 GMT",
"version": "v2"
}
] | 2011-07-26 | [
[
"Sun",
"Peng",
""
],
[
"Hao",
"Gang",
""
],
[
"Qiao",
"Cong-Feng",
""
]
] | The pseudoscalar quarkonia exclusive decays to light mesons still poses a challenge to the theoretical understanding of quarkonium properties in decay. In this work, we evaluate the processes of pseudoscalar heavy quarkonium decays into vector meson pairs, especially the helicity suppressed processes of $\eta_b\rightarrow J/\psi J/\psi$ and $\eta_c\rightarrow VV$. In the frame of NRQCD, the branching fraction of $Br[\eta_b\rightarrow J/\psi J/\psi]$ are evaluated at the next-to-leading order of perturbative QCD; and within the light-cone distribution formalism, we calculate also the higher twist effects in these processes. Numerical results show that the higher twist terms contribute more than what from the NLO QCD corrections in the process of $\eta_b\rightarrow J/\psi J/\psi$. It is found that the experimental results on $\eta_c\rightarrow VV$ are hard to be understood by merely the quark model and perturbative QCD calculation. |
hep-ph/9612235 | null | G. Camici and M. Ciafaloni | Model (In)dependent Features of the Hard Pomeron | Latex2e, 11 pages including 2 PostScript figures | Phys.Lett. B395 (1997) 118-122 | 10.1016/S0370-2693(97)00020-8 | DFF 260/11/96 | hep-ph | null | We discuss the small-x behaviour of the next-to-leading BFKL equation,
depending on various smoothing out procedures of the running coupling constant
at low momenta. While scaling violations (with resummed and calculable
anomalous dimensions) turn out to be always consistent with the renormalization
group, we argue that the nature and the location of the so-called hard Pomeron
are dependent on the smoothing out procedure, and thus really on soft hadronic
interactions.
| [
{
"created": "Tue, 3 Dec 1996 09:32:59 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Camici",
"G.",
""
],
[
"Ciafaloni",
"M.",
""
]
] | We discuss the small-x behaviour of the next-to-leading BFKL equation, depending on various smoothing out procedures of the running coupling constant at low momenta. While scaling violations (with resummed and calculable anomalous dimensions) turn out to be always consistent with the renormalization group, we argue that the nature and the location of the so-called hard Pomeron are dependent on the smoothing out procedure, and thus really on soft hadronic interactions. |
1408.1747 | Kazuhiro Tanaka | Kazuhiro Tanaka (Juntendo Univ.) | Transverse-spin gluon distribution function | 6 pages, Proceedings of the XXII. International Workshop on
Deep-Inelastic Scattering and Related Subjects (DIS2014) 28 April - 2 May
2014, Warsaw, Poland. Reference: PoS DIS2014 (2014) 229 | null | null | J-PARC-TH-0039 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce the spin-operator representation for the gluon as well as quark
distribution functions as nucleon matrix element of the gauge-invariant bilocal
light-cone operators in QCD. To identify the relevant spin operators for quarks
and gluons in a unified manner, we rely on the transformation properties of the
quark and gluon fields in the coordinate space under the action of the
generator of the Lorentz group. In particular, this approach allows us to
define the transverse-spin gluon distribution function $G_T(x)$, which is the
genuine counterpart of the transverse-spin quark distribution function $g_T(x)$
relevant to the transverse-spin structure function $g_2(x, Q^2)$ in the deep
inelastic scattering. We show that $G_T(x)$ is given by the sum of the
chromoelectric and chromomagnetic correlators associated with helicity-flip by
one unit, and the treatment of the latter correlator completes the
classification of the collinear parton distribution functions up to twist
three. We show that $G_T(x)$ receives the three-gluon and quark-gluon
correlation effects and discuss the operator product expansion for $G_T(x)$. We
also discuss the relevance of the first moment of $G_T(x)$ for the partonic
decomposition of the transverse nucleon spin.
| [
{
"created": "Fri, 8 Aug 2014 02:14:49 GMT",
"version": "v1"
}
] | 2014-08-11 | [
[
"Tanaka",
"Kazuhiro",
"",
"Juntendo Univ."
]
] | We introduce the spin-operator representation for the gluon as well as quark distribution functions as nucleon matrix element of the gauge-invariant bilocal light-cone operators in QCD. To identify the relevant spin operators for quarks and gluons in a unified manner, we rely on the transformation properties of the quark and gluon fields in the coordinate space under the action of the generator of the Lorentz group. In particular, this approach allows us to define the transverse-spin gluon distribution function $G_T(x)$, which is the genuine counterpart of the transverse-spin quark distribution function $g_T(x)$ relevant to the transverse-spin structure function $g_2(x, Q^2)$ in the deep inelastic scattering. We show that $G_T(x)$ is given by the sum of the chromoelectric and chromomagnetic correlators associated with helicity-flip by one unit, and the treatment of the latter correlator completes the classification of the collinear parton distribution functions up to twist three. We show that $G_T(x)$ receives the three-gluon and quark-gluon correlation effects and discuss the operator product expansion for $G_T(x)$. We also discuss the relevance of the first moment of $G_T(x)$ for the partonic decomposition of the transverse nucleon spin. |
hep-ph/0402281 | Wolfgang Hollik | W. Hollik, C. Meier | Electroweak corrections to $\gamma Z$ production at hadron colliders | null | Phys.Lett. B590 (2004) 69-75 | 10.1016/j.physletb.2004.03.067 | MPP-2004-25, PSI-PR-04-03 | hep-ph | null | In this paper we present the results from a calculation of the full
electroweak one-loop corrections for $\gamma Z$ vector-boson pair production at
hadron colliders. The cases of proton--antiproton as well as proton--proton
collisions, at the Tevatron and the LHC, respectively, are considered. Results
are presented for the distribution of the $\gamma Z$ invariant mass and for the
transverse momentum of the final-state photon. The higher-order electroweak
effects are numerically significant, in particular for probing possible
anomalous gauge-boson couplings.
| [
{
"created": "Fri, 27 Feb 2004 20:38:35 GMT",
"version": "v1"
}
] | 2010-04-05 | [
[
"Hollik",
"W.",
""
],
[
"Meier",
"C.",
""
]
] | In this paper we present the results from a calculation of the full electroweak one-loop corrections for $\gamma Z$ vector-boson pair production at hadron colliders. The cases of proton--antiproton as well as proton--proton collisions, at the Tevatron and the LHC, respectively, are considered. Results are presented for the distribution of the $\gamma Z$ invariant mass and for the transverse momentum of the final-state photon. The higher-order electroweak effects are numerically significant, in particular for probing possible anomalous gauge-boson couplings. |
hep-ph/0406239 | Jose Santiago | Jose Santiago | New Bounds on the String Scale from Flavor Physics | Invited review, published version | Mod.Phys.Lett.A19:497-509,2004 | 10.1142/S0217732304014008 | null | hep-ph | null | We review the very stringent lower bounds on the string scale that arise from
flavor considerations in models with intersecting branes. Despite the absence
of a realistic flavor structure at tree level, flavor changing interactions
induce a non-trivial pattern of fermion masses and mixing angles when quantum
corrections are taken into account. The resulting realistic theory of flavor
allows us to constrain, in an unambiguous way, the string scale up to levels
difficult to reconcile non-supersymmetric models.
| [
{
"created": "Tue, 22 Jun 2004 11:24:08 GMT",
"version": "v1"
}
] | 2010-01-11 | [
[
"Santiago",
"Jose",
""
]
] | We review the very stringent lower bounds on the string scale that arise from flavor considerations in models with intersecting branes. Despite the absence of a realistic flavor structure at tree level, flavor changing interactions induce a non-trivial pattern of fermion masses and mixing angles when quantum corrections are taken into account. The resulting realistic theory of flavor allows us to constrain, in an unambiguous way, the string scale up to levels difficult to reconcile non-supersymmetric models. |
hep-ph/9503474 | Markus Finkemeier | Markus Finkemeier and Erwin Mirkes | Tau Decays into Kaons | 21 pages, RevTex, no figures. We wish to dedicate this work to Roger
Decker whose death at an early age is a great loss to his friends and to the
physics community. Revised version: A few minor changes | Z.Phys. C69 (1996) 243-252 | null | MAD/PH/882, LNF-95/015(P) | hep-ph | null | Predictions for semi-leptonic decay rates of the tau lepton into two and
three meson final states with one or two kaons are derived, including a
discussion of K_S pi- K_S, K_L pi- K_L and K_S pi- K_L. The hadronic matrix
elements are expressed in terms of form factors, which can be predicted by
chiral Lagrangians supplemented by informations about all possible low-lying
resonances in the different channels. Isospin symmetry relations among the
different final states are carefully taken into account. The calculated
branching ratios are compared with measured decay rates where data are
available.
| [
{
"created": "Thu, 30 Mar 1995 15:40:35 GMT",
"version": "v1"
},
{
"created": "Fri, 9 Jun 1995 10:40:22 GMT",
"version": "v2"
}
] | 2008-02-03 | [
[
"Finkemeier",
"Markus",
""
],
[
"Mirkes",
"Erwin",
""
]
] | Predictions for semi-leptonic decay rates of the tau lepton into two and three meson final states with one or two kaons are derived, including a discussion of K_S pi- K_S, K_L pi- K_L and K_S pi- K_L. The hadronic matrix elements are expressed in terms of form factors, which can be predicted by chiral Lagrangians supplemented by informations about all possible low-lying resonances in the different channels. Isospin symmetry relations among the different final states are carefully taken into account. The calculated branching ratios are compared with measured decay rates where data are available. |
hep-ph/0605120 | Gustavo Burdman | Ivone F. M. Albuquerque, Gustavo Burdman and Z. Chacko | Direct Detection of Supersymmetric Particles in Neutrino Telescopes | 11 pages, 9 figures, final version in the Physical Review D | Phys.Rev.D75:035006,2007 | 10.1103/PhysRevD.75.035006 | null | hep-ph astro-ph hep-ex | null | In supersymmetric theories where the lightest supersymmetric particle is the
gravitino the next to lightest supersymmetric particle is typically a long
lived charged slepton. In this paper, following our earlier proposal, we
perform a detailed study of the production of pairs of these particles induced
by the interactions of high energy cosmic neutrinos with nucleons in the earth,
their propagation through the earth and finally their detection in neutrino
telescopes. We investigate the charged slepton energy loss in detail and
establish that the relatively small cross-section for the production of
supersymmetric particles is partially compensated for by the very long range of
these heavy particles. The signal, consisting of two parallel charged tracks
emerging from the earth, is characterized by a track separation of a few
hundred meters. We perform a careful analysis of the main background, coming
from direct di-muon production, and show that it can be separated from the
signal due to its characteristically smaller track separation. We conclude that
neutrino telescopes will complement collider searches in the determination of
the supersymmetry breaking scale, and may even provide the first evidence for
supersymmetry at the weak scale.
| [
{
"created": "Thu, 11 May 2006 02:30:02 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Feb 2007 18:20:18 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Albuquerque",
"Ivone F. M.",
""
],
[
"Burdman",
"Gustavo",
""
],
[
"Chacko",
"Z.",
""
]
] | In supersymmetric theories where the lightest supersymmetric particle is the gravitino the next to lightest supersymmetric particle is typically a long lived charged slepton. In this paper, following our earlier proposal, we perform a detailed study of the production of pairs of these particles induced by the interactions of high energy cosmic neutrinos with nucleons in the earth, their propagation through the earth and finally their detection in neutrino telescopes. We investigate the charged slepton energy loss in detail and establish that the relatively small cross-section for the production of supersymmetric particles is partially compensated for by the very long range of these heavy particles. The signal, consisting of two parallel charged tracks emerging from the earth, is characterized by a track separation of a few hundred meters. We perform a careful analysis of the main background, coming from direct di-muon production, and show that it can be separated from the signal due to its characteristically smaller track separation. We conclude that neutrino telescopes will complement collider searches in the determination of the supersymmetry breaking scale, and may even provide the first evidence for supersymmetry at the weak scale. |
hep-ph/0512016 | John F. Dawson | John F. Dawson, Bogdan Mihaila, Per Berglund, and Fred Cooper | Supersymmetric approximations to the 3D supersymmetric O(N) model | 16 pages, 3 figures | Phys.Rev. D73 (2006) 016007 | 10.1103/PhysRevD.73.016007 | LAUR LA-UR-05-8820 | hep-ph | null | We develop several non-perturbative approximations for studying the dynamics
of a supersymmetric O(N) model which preserve supersymmetry. We study the phase
structure of the vacuum in both the leading order in large-N approximation as
well as in the Hartree approximation, and derive the finite temperature
renormalized effective potential. We derive the exact Schwinger-Dyson equations
for the superfield Green functions and develop the machinery for going beyond
the next to leading order in large-N approximation using a truncation of these
equations which can also be derived from a two-particle irreducible effective
action.
| [
{
"created": "Thu, 1 Dec 2005 17:48:09 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Dawson",
"John F.",
""
],
[
"Mihaila",
"Bogdan",
""
],
[
"Berglund",
"Per",
""
],
[
"Cooper",
"Fred",
""
]
] | We develop several non-perturbative approximations for studying the dynamics of a supersymmetric O(N) model which preserve supersymmetry. We study the phase structure of the vacuum in both the leading order in large-N approximation as well as in the Hartree approximation, and derive the finite temperature renormalized effective potential. We derive the exact Schwinger-Dyson equations for the superfield Green functions and develop the machinery for going beyond the next to leading order in large-N approximation using a truncation of these equations which can also be derived from a two-particle irreducible effective action. |
2111.06769 | Daniele Massaro | Daniele Massaro, Chiara Arina, Jan Heisig, Fabio Maltoni and Olivier
Mattelaer | Studying dark matter with MadDM: lines and loops | 5 pages, 1 figure; proceedings of the "17th International Conference
on Topics in Astroparticle and Underground Physics" (TAUP 2021) | J.Phys.Conf.Ser. 2156 (2021) 1, 012073 | 10.1088/1742-6596/2156/1/012073 | CP3-21-64, TTK-21-45 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Automated tools for the computation of amplitudes and cross sections have
become the backbone of phenomenological studies beyond the standard model. We
present the latest developments in MadDM, a calculator of dark-matter
observables based on MadGraph5_aMC@NLO. The new version enables the fully
automated computation of loop-induced annihilation processes, relevant for
indirect detection of dark matter. Of particular interest is the direct
annihilation into photons, $\gamma \gamma,\, \gamma X$. These processes lead to
monochromatic gamma-ray lines that are smoking-gun signatures for dark-matter
annihilation in our Galaxy. MadDM computes the predictions for the expected
photon fluxes near Earth and derives constraints from the gamma-ray line
searches by Fermi-LAT and HESS. As an application, we present the implications
for the parameter space of the Inert Doublet Model.
| [
{
"created": "Fri, 12 Nov 2021 15:27:27 GMT",
"version": "v1"
}
] | 2023-12-01 | [
[
"Massaro",
"Daniele",
""
],
[
"Arina",
"Chiara",
""
],
[
"Heisig",
"Jan",
""
],
[
"Maltoni",
"Fabio",
""
],
[
"Mattelaer",
"Olivier",
""
]
] | Automated tools for the computation of amplitudes and cross sections have become the backbone of phenomenological studies beyond the standard model. We present the latest developments in MadDM, a calculator of dark-matter observables based on MadGraph5_aMC@NLO. The new version enables the fully automated computation of loop-induced annihilation processes, relevant for indirect detection of dark matter. Of particular interest is the direct annihilation into photons, $\gamma \gamma,\, \gamma X$. These processes lead to monochromatic gamma-ray lines that are smoking-gun signatures for dark-matter annihilation in our Galaxy. MadDM computes the predictions for the expected photon fluxes near Earth and derives constraints from the gamma-ray line searches by Fermi-LAT and HESS. As an application, we present the implications for the parameter space of the Inert Doublet Model. |
1408.3966 | Kaushik Bhattacharya | Kaushik Bhattacharya, Joydeep Chakrabortty, Suratna Das, Tanmoy Mondal | Higgs vacuum stability and inflationary dynamics after BICEP2 and PLANCK
dust polarisation data | Title and text are modified to match the accepted version in JCAP. 22
pages, 3 figures, Latex file | JCAP12(2014)001 | 10.1088/1475-7516/2014/12/001 | null | hep-ph astro-ph.CO gr-qc | http://creativecommons.org/licenses/publicdomain/ | If the recent detection of $B-$mode polarization of the Cosmic Microwave
Background by BICEP2 observations, withstand the test of time after the release
of recent PLANCK dust polarisation data, then it would surprisingly put the
inflationary scale near Grand Unification scale if one considers single-field
inflationary models. On the other hand, Large Hadron Collider has observed the
elusive Higgs particle whose presently observed mass can lead to electroweak
vacuum instability at high scale $(\sim{\mathcal O}(10^{10})$ GeV). In this
article, we seek for a simple particle physics model which can simultaneously
keep the vacuum of the theory stable and yield high-scale inflation
successfully. To serve our purpose, we extend the Standard Model of particle
physics with a $U(1)_{B-L}$ gauged symmetry which spontaneously breaks down
just above the inflationary scale. Such a scenario provides a constrained
parameter space where both the issues of vacuum stability and high-scale
inflation can be successfully accommodated. The threshold effect on the Higgs
quartic coupling due to the presence of the heavy inflaton field plays an
important role in keeping the electroweak vacuum stable. Furthermore, this
scenario is also capable of reheating the universe at the end of inflation.
Though the issues of Dark Matter and Dark Energy, which dominate the late-time
evolution of our universe, cannot be addressed within this framework, this
model successfully describes the early universe dynamics according to the Big
Bang model.
| [
{
"created": "Mon, 18 Aug 2014 10:33:51 GMT",
"version": "v1"
},
{
"created": "Mon, 17 Nov 2014 10:02:35 GMT",
"version": "v2"
}
] | 2014-12-09 | [
[
"Bhattacharya",
"Kaushik",
""
],
[
"Chakrabortty",
"Joydeep",
""
],
[
"Das",
"Suratna",
""
],
[
"Mondal",
"Tanmoy",
""
]
] | If the recent detection of $B-$mode polarization of the Cosmic Microwave Background by BICEP2 observations, withstand the test of time after the release of recent PLANCK dust polarisation data, then it would surprisingly put the inflationary scale near Grand Unification scale if one considers single-field inflationary models. On the other hand, Large Hadron Collider has observed the elusive Higgs particle whose presently observed mass can lead to electroweak vacuum instability at high scale $(\sim{\mathcal O}(10^{10})$ GeV). In this article, we seek for a simple particle physics model which can simultaneously keep the vacuum of the theory stable and yield high-scale inflation successfully. To serve our purpose, we extend the Standard Model of particle physics with a $U(1)_{B-L}$ gauged symmetry which spontaneously breaks down just above the inflationary scale. Such a scenario provides a constrained parameter space where both the issues of vacuum stability and high-scale inflation can be successfully accommodated. The threshold effect on the Higgs quartic coupling due to the presence of the heavy inflaton field plays an important role in keeping the electroweak vacuum stable. Furthermore, this scenario is also capable of reheating the universe at the end of inflation. Though the issues of Dark Matter and Dark Energy, which dominate the late-time evolution of our universe, cannot be addressed within this framework, this model successfully describes the early universe dynamics according to the Big Bang model. |
hep-ph/0403166 | Nikolai Uraltsev | Nikolai Uraltsev | Perturbative corrections to the semileptonic b-decay moments:
E^\ell_{cut} dependence and running-\alpha_s effects in the OPE approach | 16 pages, LaTeX, ten figures | Int.J.Mod.Phys.A20:2099-2118,2005 | 10.1142/S0217751X05020938 | Bicocca-FT-04-2, UND-HEP-04-BIG03 | hep-ph | null | We have calculated the perturbative corrections to all the structure
functions in the semileptonic decays of a heavy quark. Assuming an arbitrary
gluon mass as a technical tool allowed to obtain in parallel all the BLM
corrections. We report the basic applications, viz. perturbative corrections to
the hadronic mass and energy moments with full dependence on the charge lepton
energy cut. In the adopted scheme with the OPE momentum scale separation around
1 GeV the perturbative corrections to <M_X^2> are small and practically
independent of E_{cut}; the BLM corrections are small, too. The corrections to
the second mass squared moment show some decrease with E_{cut} consistent with
the effect of the Darwin operator, within the previously estimated theoretical
uncertainty. Perturbative corrections in the pole-type schemes appear
significant and vary with E_\ell, decreasing the moments at higher cuts. The
hardness of hadronic moments is quantitatively illustrated for different cuts
on E_\ell.
| [
{
"created": "Mon, 15 Mar 2004 21:00:06 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Uraltsev",
"Nikolai",
""
]
] | We have calculated the perturbative corrections to all the structure functions in the semileptonic decays of a heavy quark. Assuming an arbitrary gluon mass as a technical tool allowed to obtain in parallel all the BLM corrections. We report the basic applications, viz. perturbative corrections to the hadronic mass and energy moments with full dependence on the charge lepton energy cut. In the adopted scheme with the OPE momentum scale separation around 1 GeV the perturbative corrections to <M_X^2> are small and practically independent of E_{cut}; the BLM corrections are small, too. The corrections to the second mass squared moment show some decrease with E_{cut} consistent with the effect of the Darwin operator, within the previously estimated theoretical uncertainty. Perturbative corrections in the pole-type schemes appear significant and vary with E_\ell, decreasing the moments at higher cuts. The hardness of hadronic moments is quantitatively illustrated for different cuts on E_\ell. |
2304.05958 | Francisco J. de Anda | Francisco J. de Anda, Stephen F. King | Modular flavour symmetry and orbifolds | 22 pages, 3 figures. v3: Matches published version | JHEP 06 (2023) 122 | 10.1007/JHEP06(2023)122 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We develop a bottom-up approach to flavour models which combine modular
symmetry with orbifold constructions. We first consider a 6d orbifold
$\mathbb{T}^2/\mathbb{Z}_N$, with a single torus defined by one complex
coordinate $z$ and a single modulus field $\tau$, playing the role of a flavon
transforming under a finite modular symmetry. We then consider 10d orbifolds
with three factorizable tori, each defined by one complex coordinate $z_i$ and
involving the three moduli fields $\tau_1, \tau_2, \tau_3$ transforming under
three finite modular groups. Assuming supersymmetry, consistent with the
holomorphicity requirement, we consider all 10d orbifolds of the form
$(\mathbb{T}^2)^3/(\mathbb{Z}_N\times\mathbb{Z}_M)$, and list those which have
fixed values of the moduli fields (up to an integer). The key advantage of such
10d orbifold models over 4d models is that the values of the moduli are not
completely free but are constrained by geometry and symmetry. To illustrate the
approach we discuss a 10d modular seesaw model with $S_4^3$ modular symmetry
based on $(\mathbb{T}^2)^3/(\mathbb{Z}_4\times\mathbb{Z}_2)$ where $\tau_1=i,\
\tau_2=i+2$ are constrained by the orbifold, while $\tau_3=\omega$ is
determined by imposing a further remnant $S_4$ flavour symmetry, leading to a
highly predictive example in the class CSD$(n)$ with $n=1-\sqrt{6}$.
| [
{
"created": "Wed, 12 Apr 2023 16:30:52 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Apr 2023 00:40:50 GMT",
"version": "v2"
},
{
"created": "Mon, 26 Jun 2023 22:56:06 GMT",
"version": "v3"
}
] | 2023-07-12 | [
[
"de Anda",
"Francisco J.",
""
],
[
"King",
"Stephen F.",
""
]
] | We develop a bottom-up approach to flavour models which combine modular symmetry with orbifold constructions. We first consider a 6d orbifold $\mathbb{T}^2/\mathbb{Z}_N$, with a single torus defined by one complex coordinate $z$ and a single modulus field $\tau$, playing the role of a flavon transforming under a finite modular symmetry. We then consider 10d orbifolds with three factorizable tori, each defined by one complex coordinate $z_i$ and involving the three moduli fields $\tau_1, \tau_2, \tau_3$ transforming under three finite modular groups. Assuming supersymmetry, consistent with the holomorphicity requirement, we consider all 10d orbifolds of the form $(\mathbb{T}^2)^3/(\mathbb{Z}_N\times\mathbb{Z}_M)$, and list those which have fixed values of the moduli fields (up to an integer). The key advantage of such 10d orbifold models over 4d models is that the values of the moduli are not completely free but are constrained by geometry and symmetry. To illustrate the approach we discuss a 10d modular seesaw model with $S_4^3$ modular symmetry based on $(\mathbb{T}^2)^3/(\mathbb{Z}_4\times\mathbb{Z}_2)$ where $\tau_1=i,\ \tau_2=i+2$ are constrained by the orbifold, while $\tau_3=\omega$ is determined by imposing a further remnant $S_4$ flavour symmetry, leading to a highly predictive example in the class CSD$(n)$ with $n=1-\sqrt{6}$. |
1307.7548 | Johannes Bluemlein | J. Bl\"umlein, A. De Freitas, C. Raab, F. Wi{\ss}brock, J. Ablinger,
A. Hasselhuhn, M. Round, C. Schneider, A. von Manteuffel | Recent Results on the 3-Loop Heavy Flavor Wilson Coefficients in
Deep-Inelastic Scattering | 8 pages, 5 figures, 2 style files | XXI International Workshop on Deep-Inelastic Scattering and
Related Subjects -DIS2013, 22-26 April 2013, Marseilles,France | null | DESY 13-133, DO-TH 13/16, MITP/13-038, SFB/CPP-13-51, LPN 13-053} | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We report on recent progress in the calculation of the 3-loop massive Wilson
coefficients in deep-inelastic scattering at general values of $N$ for neutral
and charged current reactions in the asymptotic region $Q^2 \gg m^2$.
| [
{
"created": "Mon, 29 Jul 2013 11:45:39 GMT",
"version": "v1"
}
] | 2013-07-30 | [
[
"Blümlein",
"J.",
""
],
[
"De Freitas",
"A.",
""
],
[
"Raab",
"C.",
""
],
[
"Wißbrock",
"F.",
""
],
[
"Ablinger",
"J.",
""
],
[
"Hasselhuhn",
"A.",
""
],
[
"Round",
"M.",
""
],
[
"Schneider",
"C.",
""
],
[
"von Manteuffel",
"A.",
""
]
] | We report on recent progress in the calculation of the 3-loop massive Wilson coefficients in deep-inelastic scattering at general values of $N$ for neutral and charged current reactions in the asymptotic region $Q^2 \gg m^2$. |
hep-ph/0510310 | Ma Yong-Liang | K.B. Vijaya Kumar, Yong-Liang Ma and Yue-Liang Wu | Spin Polarisability of the Nucleon in the Heavy Baryon Effective Field
Theory | 21pages, title changed, minimal corrections | Int.J.Mod.Phys.A21:3947-3966,2006 | 10.1142/S0217751X06031521 | null | hep-ph | null | We have constructed a heavy baryon effective field theory with photon as an
external field in accordance with the symmetry requirements similar to the
heavy quark effective field theory. By treating the heavy baryon and
anti-baryon equally on the same footing in the effective field theory, we have
calculated the spin polarisabilities $\gamma_i, i=1...4$ of the nucleon at
third order and at fourth-order of the spin-dependent Compton scattering. At
leading order (LO), our results agree with the corresponding results of the
heavy baryon chiral perturbation theory, at the next-to-leading order(NLO) the
results show a large correction to the ones in the heavy baryon chiral
perturbation theory due to baryon-antibaryon coupling terms. The low energy
theorem is satisfied both at LO and at NLO. The contributions arising from the
heavy baryon-antibaryon vertex were found to be significant and the results of
the polarisabilities obtained from our theory is much closer to the
experimental data.
| [
{
"created": "Mon, 24 Oct 2005 07:40:47 GMT",
"version": "v1"
},
{
"created": "Sun, 15 Jan 2006 07:34:36 GMT",
"version": "v2"
}
] | 2014-11-18 | [
[
"Kumar",
"K. B. Vijaya",
""
],
[
"Ma",
"Yong-Liang",
""
],
[
"Wu",
"Yue-Liang",
""
]
] | We have constructed a heavy baryon effective field theory with photon as an external field in accordance with the symmetry requirements similar to the heavy quark effective field theory. By treating the heavy baryon and anti-baryon equally on the same footing in the effective field theory, we have calculated the spin polarisabilities $\gamma_i, i=1...4$ of the nucleon at third order and at fourth-order of the spin-dependent Compton scattering. At leading order (LO), our results agree with the corresponding results of the heavy baryon chiral perturbation theory, at the next-to-leading order(NLO) the results show a large correction to the ones in the heavy baryon chiral perturbation theory due to baryon-antibaryon coupling terms. The low energy theorem is satisfied both at LO and at NLO. The contributions arising from the heavy baryon-antibaryon vertex were found to be significant and the results of the polarisabilities obtained from our theory is much closer to the experimental data. |
0812.1181 | Gustavo Gil da Silveira | M.B. Gay Ducati, G.G. Silveira | Diffractive Higgs boson photoproduction in peripheral collisions | 4 pages, 7 figures, contribution to the proceedings of II Latin
American Workshop on High Energy Physics [IILAWHEP], 3-7 Dec. 2007, Sao
Miguel das Missoes, Brazil | Braz.J.Phys.38:518-521,2007 | 10.1590/S0103-97332008000400028 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An alternative process is proposed for the diffractive Higgs boson production
in peripheral $pp$ collisions, exploring it through the photon-proton
interaction by Double Pomeron Exchange. It is estimated the event rate of the
diffractive Higgs production in central rapidity for Tevatron and LHC energies,
being of the order of 1 fb, in agreement to the predictions from other
diffractive processes. The results are confronted with those obtained from a
similar approach of the Durham group.
| [
{
"created": "Fri, 5 Dec 2008 17:05:17 GMT",
"version": "v1"
}
] | 2011-08-04 | [
[
"Ducati",
"M. B. Gay",
""
],
[
"Silveira",
"G. G.",
""
]
] | An alternative process is proposed for the diffractive Higgs boson production in peripheral $pp$ collisions, exploring it through the photon-proton interaction by Double Pomeron Exchange. It is estimated the event rate of the diffractive Higgs production in central rapidity for Tevatron and LHC energies, being of the order of 1 fb, in agreement to the predictions from other diffractive processes. The results are confronted with those obtained from a similar approach of the Durham group. |
1512.05776 | John Terning | Csaba Csaki, Jay Hubisz, John Terning | The Minimal Model of a Diphoton Resonance: Production without Gluon
Couplings | 8 pages, 3 figures, missing figure supplied, typos corrected,
references added, conclusions essentially unchanged | Phys. Rev. D 93, 035002 (2016) | 10.1103/PhysRevD.93.035002 | null | hep-ph | http://creativecommons.org/licenses/by-nc-sa/4.0/ | We consider the phenomenology of a resonance that couples to photons but not
gluons, and estimate its production rate at the LHC from photon-photon fusion
in elastic pp scattering using the effective photon and narrow width
approximations. The rate is sensitive only to the mass, the spin, the total
width of the resonance, and its branching fraction to photons. Production cross
sections of 5-10 fb at 13 TeV can be easily accommodated for a 750 GeV
resonance with partial photon width of 15 GeV. This provides the minimal
explanation of the reported diphoton anomaly in the early LHC Run II data.
| [
{
"created": "Thu, 17 Dec 2015 20:55:52 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Dec 2015 20:29:30 GMT",
"version": "v2"
}
] | 2016-02-10 | [
[
"Csaki",
"Csaba",
""
],
[
"Hubisz",
"Jay",
""
],
[
"Terning",
"John",
""
]
] | We consider the phenomenology of a resonance that couples to photons but not gluons, and estimate its production rate at the LHC from photon-photon fusion in elastic pp scattering using the effective photon and narrow width approximations. The rate is sensitive only to the mass, the spin, the total width of the resonance, and its branching fraction to photons. Production cross sections of 5-10 fb at 13 TeV can be easily accommodated for a 750 GeV resonance with partial photon width of 15 GeV. This provides the minimal explanation of the reported diphoton anomaly in the early LHC Run II data. |
1203.6014 | Jonathan Rosner | Bhubanjyoti Bhattacharya and Jonathan L. Rosner | Flavor-SU(3) tests from $D^0 \to K^0 K^- \pi^+$ and $D^0 \to \bar K^0
K^+ \pi^-$ Dalitz plots | 6 pages, 1 figure. As published in Physics Letters B. arXiv admin
note: substantial text overlap with arXiv:1104.4962 | null | 10.1016/j.physletb.2012.07.009 | EFI 12-3 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The processes $D^0\to K^0 K^-\pi^+$ and $D^0\to\ok K^+\pi^-$ involve
intermediate vector resonances whose amplitudes and phases are related to each
other via flavor-SU(3) symmetry. Dalitz plots for these two processes can shed
light on the usefulness of this symmetry in studying charm decays. Until this
year the only available data on this process came from a conference report in
2002 by the BaBar Collaboration, but now an independent data sample of higher
statistics has become available from the CLEO Collaboration. The goal is to
predict Dalitz plot amplitudes and phases assuming flavor-SU(3) symmetry and
compare them with experiment.
An SU(3) fit can account for the relative magnitudes of the amplitudes for
the decays $D^0 \to K^{*-}K^+$ and $D^0 \to K^{*+}K^-$, but neither the current
BaBar sample (based on an integrated luminosity of 22 fb$^{-1}$) nor the CLEO
analysis has significant evidence for the decays $D^0\to K^{*0}\ok$ and $D^0
\to \oks K^0$. At this level one is unable to compare magnitudes and phases
with theoretical predictions. The purpose of this Letter is to advocate an
analysis using the full BaBar sample (more than 20 times the 2002 value). It
should definitively determine whether predicted magnitudes and phases agree
with experiment. A similar analysis should be possible with an even larger
sample of events collected by the Belle Collaboration at KEK-B.
| [
{
"created": "Tue, 27 Mar 2012 16:31:55 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Jun 2012 15:51:40 GMT",
"version": "v2"
},
{
"created": "Tue, 10 Jul 2012 17:54:01 GMT",
"version": "v3"
}
] | 2015-06-04 | [
[
"Bhattacharya",
"Bhubanjyoti",
""
],
[
"Rosner",
"Jonathan L.",
""
]
] | The processes $D^0\to K^0 K^-\pi^+$ and $D^0\to\ok K^+\pi^-$ involve intermediate vector resonances whose amplitudes and phases are related to each other via flavor-SU(3) symmetry. Dalitz plots for these two processes can shed light on the usefulness of this symmetry in studying charm decays. Until this year the only available data on this process came from a conference report in 2002 by the BaBar Collaboration, but now an independent data sample of higher statistics has become available from the CLEO Collaboration. The goal is to predict Dalitz plot amplitudes and phases assuming flavor-SU(3) symmetry and compare them with experiment. An SU(3) fit can account for the relative magnitudes of the amplitudes for the decays $D^0 \to K^{*-}K^+$ and $D^0 \to K^{*+}K^-$, but neither the current BaBar sample (based on an integrated luminosity of 22 fb$^{-1}$) nor the CLEO analysis has significant evidence for the decays $D^0\to K^{*0}\ok$ and $D^0 \to \oks K^0$. At this level one is unable to compare magnitudes and phases with theoretical predictions. The purpose of this Letter is to advocate an analysis using the full BaBar sample (more than 20 times the 2002 value). It should definitively determine whether predicted magnitudes and phases agree with experiment. A similar analysis should be possible with an even larger sample of events collected by the Belle Collaboration at KEK-B. |
2201.12073 | Andrei Kataev | A.L. Kataev and V.S. Molokoedov | Notes on interplay of the QCD and EW perturbative corrections to the
pole-running top-quark mass ratio | 13 pages, 2 figures, definite clarifications added; 1 extra reference
added; accepted for publication in JETP Letters | null | 10.1134/S0021364022600902 | INR-TH-2022-003 | hep-ph hep-ex hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A specific representation of the known one-loop EW correction to the relation
between the pole and running $\msbar$-scheme masses of the top-quark through
particle masses of the Standard Model is given within the Fleischer-Jegerlehner
tadpole scheme, where the vacuum expectation value of the Higgs field is
renormalized. The importance of taking into account both the EW and QCD effects
in this relation in the considered case is emphasized. It is noted that the
discard of the EW corrections leads to over $10\;{{\rm{GeV}}}$ shift in the
difference between the pole and running $t$-quark masses. This magnitude
exceeds essentially the modern uncertainties of the considered relation,
following from the treatment of the Tevatron and LHC data where both pole and
running $t$-quark masses are defined in the widespread approach when only the
QCD corrections are kept in mind between them.
| [
{
"created": "Fri, 28 Jan 2022 12:24:48 GMT",
"version": "v1"
},
{
"created": "Thu, 19 May 2022 13:17:54 GMT",
"version": "v2"
}
] | 2022-07-06 | [
[
"Kataev",
"A. L.",
""
],
[
"Molokoedov",
"V. S.",
""
]
] | A specific representation of the known one-loop EW correction to the relation between the pole and running $\msbar$-scheme masses of the top-quark through particle masses of the Standard Model is given within the Fleischer-Jegerlehner tadpole scheme, where the vacuum expectation value of the Higgs field is renormalized. The importance of taking into account both the EW and QCD effects in this relation in the considered case is emphasized. It is noted that the discard of the EW corrections leads to over $10\;{{\rm{GeV}}}$ shift in the difference between the pole and running $t$-quark masses. This magnitude exceeds essentially the modern uncertainties of the considered relation, following from the treatment of the Tevatron and LHC data where both pole and running $t$-quark masses are defined in the widespread approach when only the QCD corrections are kept in mind between them. |
1206.6278 | Pankaj Sharma | Eung Jin Chun and Pankaj Sharma | Same-Sign Tetra-Leptons from Type II Seesaw | 18 pages, 7 figures, Comment on constraints from LFV processes added,
version published in JHEP | JHEP08(2012)162 | 10.1007/JHEP08(2012)162 | KIAS-P12035 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The type II seesaw mechanism introduces a hypercharged Higgs triplet to
explain the observed neutrino masses and mixing. Among three triplet
components, the doubly charged Higgs boson can be the lightest and decay mainly
to same-sign di-leptons. Furthermore, the heavier singly charged or neutral
Higgs boson produces a doubly charged Higgs boson through its fast gauge decay.
This leads to a novel signature of same-sign tetra-leptons resulting from a
pair production of same-sign doubly charged Higgs bosons caused by the nearly
degenerate neutral scalar mixing which can be sizable for an appropriate choice
of the model parameters. After studying production cross-sections for the
same-sign tetra-lepton signal in the parameter space of the mass splitting
among triplet components and the triplet vacuum expectation value, we provide a
LHC analysis of the same-sign tetra-lepton signal for a benchmark point chosen
to maximize the event number.
| [
{
"created": "Wed, 27 Jun 2012 14:39:28 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Jul 2012 15:03:19 GMT",
"version": "v2"
},
{
"created": "Thu, 6 Sep 2012 15:30:59 GMT",
"version": "v3"
}
] | 2012-09-07 | [
[
"Chun",
"Eung Jin",
""
],
[
"Sharma",
"Pankaj",
""
]
] | The type II seesaw mechanism introduces a hypercharged Higgs triplet to explain the observed neutrino masses and mixing. Among three triplet components, the doubly charged Higgs boson can be the lightest and decay mainly to same-sign di-leptons. Furthermore, the heavier singly charged or neutral Higgs boson produces a doubly charged Higgs boson through its fast gauge decay. This leads to a novel signature of same-sign tetra-leptons resulting from a pair production of same-sign doubly charged Higgs bosons caused by the nearly degenerate neutral scalar mixing which can be sizable for an appropriate choice of the model parameters. After studying production cross-sections for the same-sign tetra-lepton signal in the parameter space of the mass splitting among triplet components and the triplet vacuum expectation value, we provide a LHC analysis of the same-sign tetra-lepton signal for a benchmark point chosen to maximize the event number. |
2303.13950 | Anirban Biswas | Anirban Biswas, Mainak Chakraborty, Sarif Khan | Reviewing the prospect of fermion triplets as dark matter and source of
baryon asymmetry in non-standard cosmology | 40 pages, 10 figures, 1 table, minor changes, version published in
JCAP | JCAP 08 (2023) 026 | 10.1088/1475-7516/2023/08/026 | null | hep-ph astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | Indirect searches of Dark Matter (DM), in conjugation with `missing track
searches' at the collider seem to confine SU(2)$_L$ fermion triplet DM (FTDM)
mass within a narrow range around 1 TeV. The canonical picture of the pure FTDM
is in tension since it is under-abundant for the said mass range. Several
preceding studies have reported that an extra species ($\phi$), redshifts
faster than the radiation ($\sim a^{-(4+n)}$ where $n>0$), leads to a faster
expanding early Universe by dominating in the energy density with an enhanced
Hubble parameter. This has the potential to revive the under-abundant FTDM
($\mathbb{Z}_2$ odd, lightest generation) by causing freeze-out earlier without
modifying the interaction strength between DM and thermal bath. On the other
hand, although the CP asymmetry produced due to the decay of $\mathbb{Z}_2$
even heavier generations of the triplet remains unaffected, its evolution is
greatly affected by the non-standard cosmology. It has been observed through
numerical estimations that the minimum mass of the triplet, required to produce
sufficient baryon asymmetry of the Universe (BAU), can be lowered up to two
orders (compared to the standard cosmology) in this fast expansion scenario.
The non-standard parameters $n$ and $T_r$ (a reference temperature below which
radiation dominance prevails), which simultaneously control DM abundance as
well as the frozen value of BAU, are tightly constrained from the observed
experimental values. We have found that $n$ is strictly bounded within the
interval $0.4\lesssim n \lesssim 1.8$ where the upper bound is imposed by the
BAU constraint whereas the lower bound arises to satisfy the correct DM
abundance. It has been noticed that the restriction on $T_r$ is not so
stringent as it can vary from sub-GeV to a few tens of GeV.
| [
{
"created": "Fri, 24 Mar 2023 12:12:52 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Aug 2023 05:33:40 GMT",
"version": "v2"
}
] | 2023-08-21 | [
[
"Biswas",
"Anirban",
""
],
[
"Chakraborty",
"Mainak",
""
],
[
"Khan",
"Sarif",
""
]
] | Indirect searches of Dark Matter (DM), in conjugation with `missing track searches' at the collider seem to confine SU(2)$_L$ fermion triplet DM (FTDM) mass within a narrow range around 1 TeV. The canonical picture of the pure FTDM is in tension since it is under-abundant for the said mass range. Several preceding studies have reported that an extra species ($\phi$), redshifts faster than the radiation ($\sim a^{-(4+n)}$ where $n>0$), leads to a faster expanding early Universe by dominating in the energy density with an enhanced Hubble parameter. This has the potential to revive the under-abundant FTDM ($\mathbb{Z}_2$ odd, lightest generation) by causing freeze-out earlier without modifying the interaction strength between DM and thermal bath. On the other hand, although the CP asymmetry produced due to the decay of $\mathbb{Z}_2$ even heavier generations of the triplet remains unaffected, its evolution is greatly affected by the non-standard cosmology. It has been observed through numerical estimations that the minimum mass of the triplet, required to produce sufficient baryon asymmetry of the Universe (BAU), can be lowered up to two orders (compared to the standard cosmology) in this fast expansion scenario. The non-standard parameters $n$ and $T_r$ (a reference temperature below which radiation dominance prevails), which simultaneously control DM abundance as well as the frozen value of BAU, are tightly constrained from the observed experimental values. We have found that $n$ is strictly bounded within the interval $0.4\lesssim n \lesssim 1.8$ where the upper bound is imposed by the BAU constraint whereas the lower bound arises to satisfy the correct DM abundance. It has been noticed that the restriction on $T_r$ is not so stringent as it can vary from sub-GeV to a few tens of GeV. |
hep-ph/0510028 | Andreas Krassnigg | R. Alkofer, M. Kloker, A. Krassnigg, R. F. Wagenbrunn | Aspects of the confinement mechanism in Coulomb-gauge QCD | 4 pages, 6 figures | Phys.Rev.Lett96:022001,2006 | 10.1103/PhysRevLett.96.022001 | null | hep-ph hep-th nucl-th | null | Phenomenological consequences of the infrared singular, instantaneous part of
the gluon propagator in Coulomb gauge are investigated. The corresponding quark
Dyson-Schwinger equation is solved, neglecting retardation and transverse
gluons and regulating the resulting infrared singularities. While the quark
propagator vanishes as the infrared regulator goes to zero, the frequency
integral over the quark propagator stays finite and well-defined. Solutions of
the homogeneous Bethe-Salpeter equation for the pseudoscalar and vector mesons
as well as for scalar and axial-vector diquarks are obtained. In the limit of a
vanishing infrared regulator the diquark masses diverge, while meson properties
and diquark radii remain finite and well-defined. These features are
interpreted with respect to the resulting aspects of confinement for colored
quark-quark correlations.
| [
{
"created": "Mon, 3 Oct 2005 15:37:07 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Alkofer",
"R.",
""
],
[
"Kloker",
"M.",
""
],
[
"Krassnigg",
"A.",
""
],
[
"Wagenbrunn",
"R. F.",
""
]
] | Phenomenological consequences of the infrared singular, instantaneous part of the gluon propagator in Coulomb gauge are investigated. The corresponding quark Dyson-Schwinger equation is solved, neglecting retardation and transverse gluons and regulating the resulting infrared singularities. While the quark propagator vanishes as the infrared regulator goes to zero, the frequency integral over the quark propagator stays finite and well-defined. Solutions of the homogeneous Bethe-Salpeter equation for the pseudoscalar and vector mesons as well as for scalar and axial-vector diquarks are obtained. In the limit of a vanishing infrared regulator the diquark masses diverge, while meson properties and diquark radii remain finite and well-defined. These features are interpreted with respect to the resulting aspects of confinement for colored quark-quark correlations. |
hep-ph/0201183 | Ming-Qiu Huang | Dao-Wei Wang, Ming-Qiu Huang, Cheng-Zu Li | Improved analysis for the baryon masses to order Lambda_{QCD}/m_Q from
QCD sum rules | 22 pages, revtex, 9 eps figures, misprints corrected, two references
added and minor changes to discussion, version to appear in Phys. Rev. D | Phys.Rev. D65 (2002) 094036 | 10.1103/PhysRevD.65.094036 | null | hep-ph | null | We use the QCD sum rule approach to calculate the masses of the Lambda_Q and
Sigma_Q baryons to the Lambda_{QCD}/m_Q order within the framework of heavy
quark effective theory. We compare the direct approach and the covariant
approach to this problem. Two forms of currents have been adopted in our
calculation and their effects on the results are discussed. Numerical results
obtained in both direct and covariant approaches are presented. The splitting
between spin 1/2 and 3/2 doublets derived from our calculation is
{\Sigma_Q^*}^2-\Sigma_Q^2\simeq 0.35\pm 0.03 GeV^2 which is in good agreement
with the experiment.
| [
{
"created": "Sat, 19 Jan 2002 13:09:07 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Mar 2002 12:07:41 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Wang",
"Dao-Wei",
""
],
[
"Huang",
"Ming-Qiu",
""
],
[
"Li",
"Cheng-Zu",
""
]
] | We use the QCD sum rule approach to calculate the masses of the Lambda_Q and Sigma_Q baryons to the Lambda_{QCD}/m_Q order within the framework of heavy quark effective theory. We compare the direct approach and the covariant approach to this problem. Two forms of currents have been adopted in our calculation and their effects on the results are discussed. Numerical results obtained in both direct and covariant approaches are presented. The splitting between spin 1/2 and 3/2 doublets derived from our calculation is {\Sigma_Q^*}^2-\Sigma_Q^2\simeq 0.35\pm 0.03 GeV^2 which is in good agreement with the experiment. |
hep-ph/9805509 | Rainer J. Fries | R. J. Fries and A. Schaefer | Polarized rho mesons and the asymmetry between Delta d^bar(x) and Delta
u^bar(x) in the sea of the nucleon | 14 pages LaTeX, 8 figures; v3: some minor changes; this preprint
supports the version to appear in Phys. Lett. B with an additional appendix | Phys.Lett. B443 (1998) 40-44 | 10.1016/S0370-2693(98)01307-0 | null | hep-ph | null | We present a calculation of the polarized rho meson cloud in a nucleon using
time-ordered perturbation theory in two different variants advocated in the
literature. We calculate the induced difference between the distributions Delta
d^bar(x) and Delta u^bar(x). We use a recent lattice calculation to motivate an
ansatz for the polarized valence quark distribution of the rho meson. Our
calculations show that the two theoretical approaches give vastly different
results. We conclude that Delta d^bar(x) - Delta u^bar(x) can be of relevant
size with important consequences for the combined fits of polarized
distribution functions.
| [
{
"created": "Fri, 29 May 1998 17:29:13 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Jun 1998 14:37:07 GMT",
"version": "v2"
},
{
"created": "Tue, 27 Oct 1998 14:02:24 GMT",
"version": "v3"
}
] | 2009-10-31 | [
[
"Fries",
"R. J.",
""
],
[
"Schaefer",
"A.",
""
]
] | We present a calculation of the polarized rho meson cloud in a nucleon using time-ordered perturbation theory in two different variants advocated in the literature. We calculate the induced difference between the distributions Delta d^bar(x) and Delta u^bar(x). We use a recent lattice calculation to motivate an ansatz for the polarized valence quark distribution of the rho meson. Our calculations show that the two theoretical approaches give vastly different results. We conclude that Delta d^bar(x) - Delta u^bar(x) can be of relevant size with important consequences for the combined fits of polarized distribution functions. |
hep-ph/0409027 | Yu-Qi Chen | YU-Qi Chen | Describing relativistic fermions with two-component field | 9 pages | null | null | null | hep-ph hep-th nucl-th | null | With a non-unitary transformation, the Lagrangian of a Dirac fermion is
decomposed into two decoupled sectors. We propose to describe massive
relativistic fermions in gauge theories in a two-component form. All relations
between the Green's functions in this form and those in the conventional
four-component form are derived. It is shown that the S-matrix elements in both
forms are exactly the same. The description of the fermion in the new form
simplifies significantly the gamma-matrix algebra in the four-component form.
In particular, in perturbative calculations the propagator of the fermion is a
scalar function. The advantages of the two-component form make it very useful
in practical applications.
| [
{
"created": "Fri, 3 Sep 2004 02:32:27 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Chen",
"YU-Qi",
""
]
] | With a non-unitary transformation, the Lagrangian of a Dirac fermion is decomposed into two decoupled sectors. We propose to describe massive relativistic fermions in gauge theories in a two-component form. All relations between the Green's functions in this form and those in the conventional four-component form are derived. It is shown that the S-matrix elements in both forms are exactly the same. The description of the fermion in the new form simplifies significantly the gamma-matrix algebra in the four-component form. In particular, in perturbative calculations the propagator of the fermion is a scalar function. The advantages of the two-component form make it very useful in practical applications. |
hep-ph/9803492 | Hiroshi Hotta | Jun Tabei and Hiroshi Hotta | Neutron Electric Dipole Moment in SUSY SU(5) GUT | 25 pages in REVTeX format, 5 figures | null | null | null | hep-ph | null | The existing estimation of the Electric Dipole Moment(EDM) of the neutron in
the SUSY SU(5) GUT model was quite smaller than one in the MSSM, despite of its
increased degree of freedom. This paradoxical result can be resolved by
appropriately estimating the CP-violation in the Higgs sector. As a result, the
neutron EDM in this model is estimated lager than the existing one as expected.
| [
{
"created": "Tue, 31 Mar 1998 04:20:59 GMT",
"version": "v1"
},
{
"created": "Fri, 13 Oct 2000 13:40:46 GMT",
"version": "v2"
},
{
"created": "Mon, 16 Oct 2000 12:10:28 GMT",
"version": "v3"
},
{
"created": "Fri, 20 Oct 2000 12:22:15 GMT",
"version": "v4"
},
{
"created": "Mon, 30 Oct 2000 09:12:46 GMT",
"version": "v5"
},
{
"created": "Mon, 9 Apr 2001 14:18:39 GMT",
"version": "v6"
}
] | 2007-05-23 | [
[
"Tabei",
"Jun",
""
],
[
"Hotta",
"Hiroshi",
""
]
] | The existing estimation of the Electric Dipole Moment(EDM) of the neutron in the SUSY SU(5) GUT model was quite smaller than one in the MSSM, despite of its increased degree of freedom. This paradoxical result can be resolved by appropriately estimating the CP-violation in the Higgs sector. As a result, the neutron EDM in this model is estimated lager than the existing one as expected. |
2312.11606 | Melissa van Beekveld | Melissa van Beekveld, Leonardo Vernazza, Chris D. White | Exponentiation of soft quark effects from the replica trick | 38 pages + 9 pages appendices | null | null | Nikhef 2023-027 | hep-ph | http://creativecommons.org/licenses/by/4.0/ | In this paper, we show that multiple maximally soft (anti-)quark and gluon
emissions exponentiate at the level of either the amplitude or cross-section.
We first show that such emissions can be captured by introducing new soft
emission operators, which serve to generalise the well-known Wilson lines
describing emissions of maximally soft gluons. Next, we prove that vacuum
expectation values of these operators exponentiate using the replica trick, a
statistical-physics argument that has previously been used to demonstrate
soft-gluon exponentiation properties in QCD. The obtained results are general,
i.e. not tied to a particular scattering process. We illustrate our arguments
by demonstrating the exponentiation of certain real and virtual corrections
affecting subleading partonic channels in deep-inelastic scattering.
| [
{
"created": "Mon, 18 Dec 2023 19:00:00 GMT",
"version": "v1"
}
] | 2023-12-20 | [
[
"van Beekveld",
"Melissa",
""
],
[
"Vernazza",
"Leonardo",
""
],
[
"White",
"Chris D.",
""
]
] | In this paper, we show that multiple maximally soft (anti-)quark and gluon emissions exponentiate at the level of either the amplitude or cross-section. We first show that such emissions can be captured by introducing new soft emission operators, which serve to generalise the well-known Wilson lines describing emissions of maximally soft gluons. Next, we prove that vacuum expectation values of these operators exponentiate using the replica trick, a statistical-physics argument that has previously been used to demonstrate soft-gluon exponentiation properties in QCD. The obtained results are general, i.e. not tied to a particular scattering process. We illustrate our arguments by demonstrating the exponentiation of certain real and virtual corrections affecting subleading partonic channels in deep-inelastic scattering. |
hep-ph/0105203 | Alvaro De Rujula | A. De Rujula | High-energy neutrinos and hard $\gamma$-rays in coincidence with Gamma
Ray Bursts | 14 pages plus 9 figures. A talk at the Neutrino Telescope Workshop,
Venice 2001 | null | null | null | hep-ph | null | The observations suggest that $\gamma$-ray bursts (GRBs) are produced by jets
of relativistic cannonballs (CBs), emitted in supernova (SN) explosions. The
CBs, reheated by their collision with the SN shell, emit radiation and
Doppler-boost it to the few-hundred keV energy of the GRB's photons.
Chaperoning the GRB, there should be an intense flux of neutrinos of a few
hundreds of GeV energy, made in $\pi^\pm$ decays: the SN shell acts as a dump
of the beam of CBs. The $\nu$ beam carries almost all of the emitted energy,
but is much narrower than the GRB beam and should only be detected in
coincidence with the small fraction of GRBs whose CBs are very precisely
pointing to us. The $\pi^0$s made in the transparent outskirts of the SN shell
decay into energetic $\gamma$-rays (EGRs) of energy of ${\cal{O}}$(100) GeV.
The EGR beam, whose energy fluence is comparable to that of the companion GRB,
is as wide as the GRB beam and should be observable, in coincidence with GRBs,
with existing or planned detectors.
| [
{
"created": "Sun, 20 May 2001 15:16:33 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"De Rujula",
"A.",
""
]
] | The observations suggest that $\gamma$-ray bursts (GRBs) are produced by jets of relativistic cannonballs (CBs), emitted in supernova (SN) explosions. The CBs, reheated by their collision with the SN shell, emit radiation and Doppler-boost it to the few-hundred keV energy of the GRB's photons. Chaperoning the GRB, there should be an intense flux of neutrinos of a few hundreds of GeV energy, made in $\pi^\pm$ decays: the SN shell acts as a dump of the beam of CBs. The $\nu$ beam carries almost all of the emitted energy, but is much narrower than the GRB beam and should only be detected in coincidence with the small fraction of GRBs whose CBs are very precisely pointing to us. The $\pi^0$s made in the transparent outskirts of the SN shell decay into energetic $\gamma$-rays (EGRs) of energy of ${\cal{O}}$(100) GeV. The EGR beam, whose energy fluence is comparable to that of the companion GRB, is as wide as the GRB beam and should be observable, in coincidence with GRBs, with existing or planned detectors. |
2104.12063 | Masaki J.S. Yang | Masaki J. S. Yang | Diagonal reflection symmetries, four-zero texture, and trimaximal mixing
with predicted $\theta_{13}$ in an $A_{4}$ symmeric model | 12 pages, 1 figure, the final version published in PTEP (Since the
figure was not displayed, it is fixed by increasing the version) | Prog. Theor. Exp. Phys. 2022, 013B12 | 10.1093/ptep/ptab162 | STUPP-21-245 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we impose a magic symmetry on the neutrino mass matrix
$m_{\nu}$ with universal four-zero texture and diagonal reflection symmetries.
Due to the magic symmetry, the MNS matrix has trimaximal mixing inevitably.
Since the lepton sector has only six free parameters, physical observables of
leptons are all determined from the charged leptons masses $m_{ei}$, the
neutrino mass differences $\Delta m_{i1}^{2}$, and the mixing angle
$\theta_{23}$.
This scheme predicts $\sin \theta_{13} = 0.149$, that is almost equal to the
latest best fit, as a function of the lepton masses $m_{e, \mu}$ and the mass
differences $\Delta m_{i1}^{2}$. Moreover, even if the mass matrix has
perturbations that break the magic symmetry, the prediction of $\sin
\theta_{13}$ is retained with good accuracy for the four-zero texture with
diagonal reflection symmetries.
| [
{
"created": "Sun, 25 Apr 2021 05:14:46 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Dec 2021 02:19:48 GMT",
"version": "v2"
},
{
"created": "Fri, 22 Jul 2022 05:08:24 GMT",
"version": "v3"
}
] | 2022-07-25 | [
[
"Yang",
"Masaki J. S.",
""
]
] | In this paper, we impose a magic symmetry on the neutrino mass matrix $m_{\nu}$ with universal four-zero texture and diagonal reflection symmetries. Due to the magic symmetry, the MNS matrix has trimaximal mixing inevitably. Since the lepton sector has only six free parameters, physical observables of leptons are all determined from the charged leptons masses $m_{ei}$, the neutrino mass differences $\Delta m_{i1}^{2}$, and the mixing angle $\theta_{23}$. This scheme predicts $\sin \theta_{13} = 0.149$, that is almost equal to the latest best fit, as a function of the lepton masses $m_{e, \mu}$ and the mass differences $\Delta m_{i1}^{2}$. Moreover, even if the mass matrix has perturbations that break the magic symmetry, the prediction of $\sin \theta_{13}$ is retained with good accuracy for the four-zero texture with diagonal reflection symmetries. |
1911.06822 | Joachim Brod | Joachim Brod, Martin Gorbahn, Emmanuel Stamou | Standard-model prediction of $\epsilon_K$ with manifest CKM unitarity | 5 pages, 1 figure | Phys. Rev. Lett. 125, 171803 (2020) | 10.1103/PhysRevLett.125.171803 | null | hep-ph hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The parameter $\epsilon_K$ describes CP violation in the neutral kaon system
and is one of the most sensitive probes of new physics. The large uncertainties
related to the charm-quark contribution to $\epsilon_K$ have so far prevented a
reliable standard-model prediction. We show that CKM unitarity enforces a
unique form of the $|\Delta S = 2|$ weak effective Lagrangian in which the
short-distance theory uncertainty of the imaginary part is dramatically
reduced. The uncertainty related to the charm-quark contribution is now at the
percent level. We present the updated standard-model prediction $\epsilon_K =
2.16(6)(8)(15) \times 10^{-3}$, where the errors in brackets correspond to QCD
short-distance and long-distance, and parametric uncertainties, respectively.
| [
{
"created": "Fri, 15 Nov 2019 19:00:00 GMT",
"version": "v1"
}
] | 2020-10-28 | [
[
"Brod",
"Joachim",
""
],
[
"Gorbahn",
"Martin",
""
],
[
"Stamou",
"Emmanuel",
""
]
] | The parameter $\epsilon_K$ describes CP violation in the neutral kaon system and is one of the most sensitive probes of new physics. The large uncertainties related to the charm-quark contribution to $\epsilon_K$ have so far prevented a reliable standard-model prediction. We show that CKM unitarity enforces a unique form of the $|\Delta S = 2|$ weak effective Lagrangian in which the short-distance theory uncertainty of the imaginary part is dramatically reduced. The uncertainty related to the charm-quark contribution is now at the percent level. We present the updated standard-model prediction $\epsilon_K = 2.16(6)(8)(15) \times 10^{-3}$, where the errors in brackets correspond to QCD short-distance and long-distance, and parametric uncertainties, respectively. |
1305.5979 | Ke Ye | Ke Ye, Daneng Yang, Qiang Li | The CERN LHC Sensitivity on measuring WZGamma Production and Anomalous
WWZGamma Coupling | 15 pages, 5 figures. arXiv admin note: text overlap with
arXiv:1211.1641 | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we present for the first time a detailed Monte Carlo study of
measuring WZGamma production with pure leptonic decays and probing anomalous
quartic gauge-boson WWZGamma couplings at the sqrt(s) = 14 TeV LHC, with parton
shower and detector simulation effects taken into account. We find that with an
integrated luminosity of 100 fb-1 and proper selection cuts, the Standard Model
WZGamma signal significance can be improved to as much as 3 sigma. After
reviewing previous parametrization on anomalous WWZGamma couplings (see
e.g.an/Lambda^2 or k2m/Lambda^2 as shown in Ref. [17]), we propose a more
general parametrization scheme with 4 free inputs leading only to genuine
WWZGamma aQGC couplings. Finally, our numerical results show that one can reach
constraints at 95% confidence level of -5.7 * 10^{-5} GeV^{-2} < k2m/Lambda^2 <
5.5 * 10^{-5} GeV^{-2} and -2.2 x 10^{-5} GeV^{-2} < an/Lambda^2 < 2.4 *
10^{-5} GeV^{-2}, which are more stringent than LEP's results by three orders
of magnitude.
| [
{
"created": "Sun, 26 May 2013 01:19:46 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Jul 2013 23:33:58 GMT",
"version": "v2"
}
] | 2013-07-15 | [
[
"Ye",
"Ke",
""
],
[
"Yang",
"Daneng",
""
],
[
"Li",
"Qiang",
""
]
] | In this paper we present for the first time a detailed Monte Carlo study of measuring WZGamma production with pure leptonic decays and probing anomalous quartic gauge-boson WWZGamma couplings at the sqrt(s) = 14 TeV LHC, with parton shower and detector simulation effects taken into account. We find that with an integrated luminosity of 100 fb-1 and proper selection cuts, the Standard Model WZGamma signal significance can be improved to as much as 3 sigma. After reviewing previous parametrization on anomalous WWZGamma couplings (see e.g.an/Lambda^2 or k2m/Lambda^2 as shown in Ref. [17]), we propose a more general parametrization scheme with 4 free inputs leading only to genuine WWZGamma aQGC couplings. Finally, our numerical results show that one can reach constraints at 95% confidence level of -5.7 * 10^{-5} GeV^{-2} < k2m/Lambda^2 < 5.5 * 10^{-5} GeV^{-2} and -2.2 x 10^{-5} GeV^{-2} < an/Lambda^2 < 2.4 * 10^{-5} GeV^{-2}, which are more stringent than LEP's results by three orders of magnitude. |
1203.5963 | Maxim Chernodub | M. N. Chernodub, Jos Van Doorsselaere and Henri Verschelde | Magnetic-field-induced superconductivity and superfluidity of W and Z
bosons: in tandem transport and kaleidoscopic vortex states | 7 pages, 11 figures; v2: discussions extended, matches the published
version | Phys. Rev. D 88, 065006 (2013) | 10.1103/PhysRevD.88.065006 | null | hep-ph cond-mat.supr-con | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that in a background of a sufficiently strong magnetic field the
electroweak sector of the quantum vacuum exhibits superconducting and,
unexpectedly, superfluid properties due to the magnetic-field-induced
condensation of, respectively, W and Z bosons. The phase transition to the
"tandem" superconductor-superfluid phase -- which is weakly sensitive to the
Higgs sector of the standard model -- occurs at the critical magnetic field of
10^{20} T. The superconductor-superfluid phase of the electroweak vacuum has
anisotropic transport properties as both charged and neutral superflows may
propagate only along the magnetic field axis. The ground state possesses an
unusual "kaleidoscopic" structure made of a hexagonal lattice of superfluid
vortices superimposed on a triangular lattice of superconductor vortices.
| [
{
"created": "Tue, 27 Mar 2012 13:07:35 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Sep 2013 17:54:51 GMT",
"version": "v2"
}
] | 2013-09-10 | [
[
"Chernodub",
"M. N.",
""
],
[
"Van Doorsselaere",
"Jos",
""
],
[
"Verschelde",
"Henri",
""
]
] | We show that in a background of a sufficiently strong magnetic field the electroweak sector of the quantum vacuum exhibits superconducting and, unexpectedly, superfluid properties due to the magnetic-field-induced condensation of, respectively, W and Z bosons. The phase transition to the "tandem" superconductor-superfluid phase -- which is weakly sensitive to the Higgs sector of the standard model -- occurs at the critical magnetic field of 10^{20} T. The superconductor-superfluid phase of the electroweak vacuum has anisotropic transport properties as both charged and neutral superflows may propagate only along the magnetic field axis. The ground state possesses an unusual "kaleidoscopic" structure made of a hexagonal lattice of superfluid vortices superimposed on a triangular lattice of superconductor vortices. |
0705.1014 | Yoshiharu Kawamura | Yoshiharu Kawamura and Teppei Kinami | More about Superparticle Sum Rules in Grand Unified Theories | 40 pages, footnote in 2.3 and references added | Int.J.Mod.Phys.A22:4617-4650,2007 | 10.1142/S0217751X07036944 | null | hep-ph | null | Sum rules among superparticle masses are derived under the assumption that
models beyond the MSSM are four-dimensional supersymmetric grand unified
theories or five-dimensional supersymmetric orbifold grand unified theories.
Sfermion sum rules are classified into four types and those sum rules can be
useful probes of the MSSM and beyond.
| [
{
"created": "Mon, 7 May 2007 23:57:23 GMT",
"version": "v1"
},
{
"created": "Fri, 1 Jun 2007 07:49:51 GMT",
"version": "v2"
},
{
"created": "Fri, 8 Jun 2007 07:09:27 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Kawamura",
"Yoshiharu",
""
],
[
"Kinami",
"Teppei",
""
]
] | Sum rules among superparticle masses are derived under the assumption that models beyond the MSSM are four-dimensional supersymmetric grand unified theories or five-dimensional supersymmetric orbifold grand unified theories. Sfermion sum rules are classified into four types and those sum rules can be useful probes of the MSSM and beyond. |
1512.06666 | Mike Williams | Tom Boettcher, Philip Ilten and Mike Williams | A direct probe of the intrinsic charm content of the proton | 7 pages, 6 figures, 1 table; v2 refs added | Phys. Rev. D 93, 074008 (2016) | 10.1103/PhysRevD.93.074008 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Measurement of $Z$ bosons produced in association with charm jets $(Zc)$ in
proton-proton collisions in the forward region provides a direct probe of a
potential non-perturbative (intrinsic) charm component in the proton wave
function. We provide a detailed study of the potential to measure $Zc$
production at the LHCb experiment in Runs 2 and 3 of the LHC. The sensitivity
to valence-like (sea-like) intrinsic charm is predicted to be $\langle x
\rangle_{\rm IC} \gtrsim 0.3\%(1\%)$. The impact of intrinsic charm on Higgs
production at the LHC, including $Hc$, is also discussed in detail.
| [
{
"created": "Mon, 21 Dec 2015 15:33:09 GMT",
"version": "v1"
},
{
"created": "Sat, 9 Jan 2016 20:12:04 GMT",
"version": "v2"
}
] | 2016-04-13 | [
[
"Boettcher",
"Tom",
""
],
[
"Ilten",
"Philip",
""
],
[
"Williams",
"Mike",
""
]
] | Measurement of $Z$ bosons produced in association with charm jets $(Zc)$ in proton-proton collisions in the forward region provides a direct probe of a potential non-perturbative (intrinsic) charm component in the proton wave function. We provide a detailed study of the potential to measure $Zc$ production at the LHCb experiment in Runs 2 and 3 of the LHC. The sensitivity to valence-like (sea-like) intrinsic charm is predicted to be $\langle x \rangle_{\rm IC} \gtrsim 0.3\%(1\%)$. The impact of intrinsic charm on Higgs production at the LHC, including $Hc$, is also discussed in detail. |
0710.5846 | Stephan Mei{\ss}ner | S. Meissner, A. Metz, M. Schlegel, K. Goeke | Relations between GPDs and TMDs: model results and beyond | 5 pages; talk given by S. Meissner at the 12th Workshop on High
Energy Spin Physics (DSPIN-07), Dubna, Russia, September 3 - 7, 2007 | null | null | null | hep-ph | null | Comparing the respective structures of the correlators defining generalized
and transverse momentum dependent parton distributions, one finds possible
relations between these two objects. Although it looks like the relations found
do not hold in general, we show that they can be established at least in simple
spectator model calculations. In addition, we discuss these relations in the
context of generalized transverse momentum dependent parton distributions.
| [
{
"created": "Wed, 31 Oct 2007 12:02:26 GMT",
"version": "v1"
}
] | 2007-11-01 | [
[
"Meissner",
"S.",
""
],
[
"Metz",
"A.",
""
],
[
"Schlegel",
"M.",
""
],
[
"Goeke",
"K.",
""
]
] | Comparing the respective structures of the correlators defining generalized and transverse momentum dependent parton distributions, one finds possible relations between these two objects. Although it looks like the relations found do not hold in general, we show that they can be established at least in simple spectator model calculations. In addition, we discuss these relations in the context of generalized transverse momentum dependent parton distributions. |
hep-ph/9608266 | Mikhail Vysotsky | J.-M. Fr\`ere (1), R.B. Nevzorov (2), M.I.Vysotsky (2) ((1)
Universit\'e Libre de Bruxelles, (2) ITEP) | Stimulated Neutrino Conversion and Bounds on Neutrino Magnetic Moments | one reference modified + minor changes, 8 pages, plain Latex | Phys.Lett. B394 (1997) 127-131 | 10.1016/S0370-2693(96)01667-X | ULB-TH 96/14 | hep-ph | null | Recent experiment proposed to observe induced radiative neutrino transitions
are confronted to existing bounds on neutrino magnetic moments from earth-based
experiments. These are found to exclude any observation by several orders of
magnitude, unless the magnetic moments are assumed to be strongly momentum
dependent. This possibility is discussed in some generality, and we find that
nontrivial dependence of the neutrino form factor may indeed occur, leading to
quite unexpected effects, although this is insufficient by orders of magnitude
to justify the experiments.
| [
{
"created": "Thu, 8 Aug 1996 13:31:50 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Oct 1996 12:56:22 GMT",
"version": "v2"
}
] | 2016-08-15 | [
[
"Frère",
"J. -M.",
""
],
[
"Nevzorov",
"R. B.",
""
],
[
"Vysotsky",
"M. I.",
""
]
] | Recent experiment proposed to observe induced radiative neutrino transitions are confronted to existing bounds on neutrino magnetic moments from earth-based experiments. These are found to exclude any observation by several orders of magnitude, unless the magnetic moments are assumed to be strongly momentum dependent. This possibility is discussed in some generality, and we find that nontrivial dependence of the neutrino form factor may indeed occur, leading to quite unexpected effects, although this is insufficient by orders of magnitude to justify the experiments. |
1003.1643 | Jonathan Butterworth | J. M. Butterworth, F. Maltoni, F. Moortgat, P. Richardson, S.
Schumann, P. Skands, J. Alwall, A. Arbey, L. Basso, S. Belov, A. Bharucha, F.
Braam, A. Buckley, M. Campanelli, R. Chierici, A. Djouadi, L. Dudko, C. Duhr,
F. Febres Cordero, P. Francavilla, B. Fuks, L. Garren, T. Goto, M. Grazzini,
T. Hahn, U. Haisch, K. Hamilton, S. Heinemeyer, G. Hesketh, S. Hoeche, H.
Hoeth, J. Huston, J. Kalinowski, D. Kekelidze, S. Kraml, H. Lacker, P. Lenzi,
P. Loch, L. Lonnblad, F. Mahmoudi, E. Maina, D. Majumder, M. Mangano, K.
Mazumdar, A. Martin, J. Monk, M. Muhlleitner, C. Oleari, S. Ovyn, R. Pittau,
S. Plaetzer, G. Piacquadio, L. Reina, J. Reuter, X. Rouby, C. Robinson, T.
Roy, M. D. Schwartz, H. Schulz, E. von Seggern, A. Sherstnev, F. Siegert, T.
Sjostrand, P. Slavich, M. Spira, C. Taylor, M. Vesterinen, S. de Visscher, D.
Wackeroth, S. Weinzierl, J. Winter, T. R. Wyatt | THE TOOLS AND MONTE CARLO WORKING GROUP Summary Report from the Les
Houches 2009 Workshop on TeV Colliders | 144 Pages. Workshop site
http://wwwlapp.in2p3.fr/conferences/LesHouches/Houches2009/ . Conveners were
Butterworth, Maltoni, Moortgat, Richardson, Schumann and Skands | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This is the summary and introduction to the proceedings contributions for the
Les Houches 2009 "Tools and Monte Carlo" working group.
| [
{
"created": "Mon, 8 Mar 2010 14:50:49 GMT",
"version": "v1"
}
] | 2013-11-19 | [
[
"Butterworth",
"J. M.",
""
],
[
"Maltoni",
"F.",
""
],
[
"Moortgat",
"F.",
""
],
[
"Richardson",
"P.",
""
],
[
"Schumann",
"S.",
""
],
[
"Skands",
"P.",
""
],
[
"Alwall",
"J.",
""
],
[
"Arbey",
"A.",
""
],
[
"Basso",
"L.",
""
],
[
"Belov",
"S.",
""
],
[
"Bharucha",
"A.",
""
],
[
"Braam",
"F.",
""
],
[
"Buckley",
"A.",
""
],
[
"Campanelli",
"M.",
""
],
[
"Chierici",
"R.",
""
],
[
"Djouadi",
"A.",
""
],
[
"Dudko",
"L.",
""
],
[
"Duhr",
"C.",
""
],
[
"Cordero",
"F. Febres",
""
],
[
"Francavilla",
"P.",
""
],
[
"Fuks",
"B.",
""
],
[
"Garren",
"L.",
""
],
[
"Goto",
"T.",
""
],
[
"Grazzini",
"M.",
""
],
[
"Hahn",
"T.",
""
],
[
"Haisch",
"U.",
""
],
[
"Hamilton",
"K.",
""
],
[
"Heinemeyer",
"S.",
""
],
[
"Hesketh",
"G.",
""
],
[
"Hoeche",
"S.",
""
],
[
"Hoeth",
"H.",
""
],
[
"Huston",
"J.",
""
],
[
"Kalinowski",
"J.",
""
],
[
"Kekelidze",
"D.",
""
],
[
"Kraml",
"S.",
""
],
[
"Lacker",
"H.",
""
],
[
"Lenzi",
"P.",
""
],
[
"Loch",
"P.",
""
],
[
"Lonnblad",
"L.",
""
],
[
"Mahmoudi",
"F.",
""
],
[
"Maina",
"E.",
""
],
[
"Majumder",
"D.",
""
],
[
"Mangano",
"M.",
""
],
[
"Mazumdar",
"K.",
""
],
[
"Martin",
"A.",
""
],
[
"Monk",
"J.",
""
],
[
"Muhlleitner",
"M.",
""
],
[
"Oleari",
"C.",
""
],
[
"Ovyn",
"S.",
""
],
[
"Pittau",
"R.",
""
],
[
"Plaetzer",
"S.",
""
],
[
"Piacquadio",
"G.",
""
],
[
"Reina",
"L.",
""
],
[
"Reuter",
"J.",
""
],
[
"Rouby",
"X.",
""
],
[
"Robinson",
"C.",
""
],
[
"Roy",
"T.",
""
],
[
"Schwartz",
"M. D.",
""
],
[
"Schulz",
"H.",
""
],
[
"von Seggern",
"E.",
""
],
[
"Sherstnev",
"A.",
""
],
[
"Siegert",
"F.",
""
],
[
"Sjostrand",
"T.",
""
],
[
"Slavich",
"P.",
""
],
[
"Spira",
"M.",
""
],
[
"Taylor",
"C.",
""
],
[
"Vesterinen",
"M.",
""
],
[
"de Visscher",
"S.",
""
],
[
"Wackeroth",
"D.",
""
],
[
"Weinzierl",
"S.",
""
],
[
"Winter",
"J.",
""
],
[
"Wyatt",
"T. R.",
""
]
] | This is the summary and introduction to the proceedings contributions for the Les Houches 2009 "Tools and Monte Carlo" working group. |
1211.3580 | Aleksandra Drozd | Aleksandra Drozd, Bohdan Grzadkowski, John F. Gunion, Yun Jiang | Two-Higgs-Doublet Models and Enhanced Rates for a 125 GeV Higgs | 15 pages, 9 figures | null | 10.1007/JHEP05(2013)072 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine the level of enhancement that can be achieved in the ZZ and
\gamma\gamma channels for a two-Higgs-doublet model Higgs boson (either the
light h or the heavy H) with mass near 125 GeV after imposing all constraints
from LEP data, B physics, precision electroweak data, vacuum stability,
unitarity and perturbativity. The latter constraints restrict substantially the
possibilities for enhancing the gg -> h -> \gamma\gamma or gg -> H ->
\gamma\gamma signal relative to that for the SM Higgs, hSM. Further, we find
that a significant enhancement of the gg -> h -> \gamma\gamma or gg -> H ->
\gamma\gamma signal in Type II models is possible only if the gg -> h -> ZZ or
gg -> H -> ZZ mode is even more enhanced, a situation disfavored by current
data. In contrast, in the Type I model one can achieve enhanced rates in the
\gamma\gamma final state for the h while having the ZZ mode at or below the SM
rate - the largest [gg -> h -> \gamma\gamma]/[gg -> hSM -> \gamma\gamma] ratio
found is of order ~1.3 when the two Higgs doublet vacuum expectation ratio is
tan\beta = 4 or 20 and the charged Higgs boson has its minimal LEP-allowed
value of m_{H^\pm} = 90 GeV.
| [
{
"created": "Thu, 15 Nov 2012 11:44:21 GMT",
"version": "v1"
},
{
"created": "Fri, 5 Apr 2013 21:52:57 GMT",
"version": "v2"
}
] | 2015-06-12 | [
[
"Drozd",
"Aleksandra",
""
],
[
"Grzadkowski",
"Bohdan",
""
],
[
"Gunion",
"John F.",
""
],
[
"Jiang",
"Yun",
""
]
] | We examine the level of enhancement that can be achieved in the ZZ and \gamma\gamma channels for a two-Higgs-doublet model Higgs boson (either the light h or the heavy H) with mass near 125 GeV after imposing all constraints from LEP data, B physics, precision electroweak data, vacuum stability, unitarity and perturbativity. The latter constraints restrict substantially the possibilities for enhancing the gg -> h -> \gamma\gamma or gg -> H -> \gamma\gamma signal relative to that for the SM Higgs, hSM. Further, we find that a significant enhancement of the gg -> h -> \gamma\gamma or gg -> H -> \gamma\gamma signal in Type II models is possible only if the gg -> h -> ZZ or gg -> H -> ZZ mode is even more enhanced, a situation disfavored by current data. In contrast, in the Type I model one can achieve enhanced rates in the \gamma\gamma final state for the h while having the ZZ mode at or below the SM rate - the largest [gg -> h -> \gamma\gamma]/[gg -> hSM -> \gamma\gamma] ratio found is of order ~1.3 when the two Higgs doublet vacuum expectation ratio is tan\beta = 4 or 20 and the charged Higgs boson has its minimal LEP-allowed value of m_{H^\pm} = 90 GeV. |
2309.07343 | Ryan Plestid | Richard J. Hill and Ryan Plestid | Field Theory of the Fermi Function | null | null | null | CALT-TH/2023-029, FERMILAB-PUB-23-453-T | hep-ph hep-th nucl-ex nucl-th | http://creativecommons.org/licenses/by/4.0/ | The Fermi function $F(Z,E)$ accounts for QED corrections to beta decays that
are enhanced at either small electron velocity $\beta$ or large nuclear charge
$Z$. For precision applications, the Fermi function must be combined with other
radiative corrections and with scale- and scheme-dependent hadronic matrix
elements. We formulate the Fermi function as a field theory object and present
a new factorization formula for QED radiative corrections to beta decays. We
provide new results for the anomalous dimension of the corresponding effective
operator complete through three loops, and resum perturbative logarithms and
$\pi$-enhancements with renormalization group methods. Our results are
important for tests of fundamental physics with precision beta decay and
related processes.
| [
{
"created": "Wed, 13 Sep 2023 22:47:11 GMT",
"version": "v1"
}
] | 2023-09-15 | [
[
"Hill",
"Richard J.",
""
],
[
"Plestid",
"Ryan",
""
]
] | The Fermi function $F(Z,E)$ accounts for QED corrections to beta decays that are enhanced at either small electron velocity $\beta$ or large nuclear charge $Z$. For precision applications, the Fermi function must be combined with other radiative corrections and with scale- and scheme-dependent hadronic matrix elements. We formulate the Fermi function as a field theory object and present a new factorization formula for QED radiative corrections to beta decays. We provide new results for the anomalous dimension of the corresponding effective operator complete through three loops, and resum perturbative logarithms and $\pi$-enhancements with renormalization group methods. Our results are important for tests of fundamental physics with precision beta decay and related processes. |
2304.12546 | Fernando Rossi Torres | C. A. Moura, L. Quintino, F. Rossi-Torres | Analyzing the time spectrum of supernova neutrinos to constrain their
effective mass or Lorentz Invariance Violation | 18 pages, 11 figures, 7 tables. This version matches the published
version on Universe | Universe 2023, 9, 259 | 10.3390/universe9060259 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the expected arrival time spectrum of supernova neutrinos using
simulated luminosity and compute the expected number of events in future
detectors such as the DUNE Far Detector and Hyper-Kamiokande. We develop a
general method using minimum square statistics that can compute the sensitivity
to any variable affecting neutrino time of flight. We apply this method in two
different situations: First, we compare the time spectrum changes due to
different neutrino mass values to put limits on electron (anti)neutrino
effective mass. Second, we constrain Lorentz invariance violation through the
mass scale, $M_{QG}$, at which it would occur. We consider two main neutrino
detection techniques: 1. DUNE-like liquid argon TPC, for which the main
detection channel is $\nu_e +\, ^{40}\mbox{Ar} \rightarrow e^- +\,
^{40}\mbox{K}^*$, related to the supernova neutronization burst; and 2.
HyperK-like water Cherenkov detector, for which $\bar \nu_e + p \rightarrow e^+
+ n$ is the main detection channel. We consider a fixed supernova distance of
10~kpc and two different masses of the progenitor star: (i) 15~$M_\odot$ with
neutrino emission time up to 0.3~s and (ii) 11.2~$M_\odot$ with neutrino
emission time up to 10~s. The best mass limits at 3$\sigma$ are for
$\mathcal{O}(1)$~eV. For $\nu_e$, the best limit comes from a DUNE-like
detector if the mass ordering happens to be inverted. For $\bar \nu_e$, the
best limit comes from a HyperK-like detector. The best limit for the Lorentz
invariance violation mass scale at the 3$\sigma$ level considering a
superluminal or subluminal effect is $M_{QG} \gtrsim 10^{13}$~GeV ($M_{QG}
\gtrsim 5 \times 10^{5}$~GeV) for linear (quadratic) energy dependence.
| [
{
"created": "Tue, 25 Apr 2023 03:30:27 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Jun 2023 21:09:39 GMT",
"version": "v2"
}
] | 2023-06-06 | [
[
"Moura",
"C. A.",
""
],
[
"Quintino",
"L.",
""
],
[
"Rossi-Torres",
"F.",
""
]
] | We analyze the expected arrival time spectrum of supernova neutrinos using simulated luminosity and compute the expected number of events in future detectors such as the DUNE Far Detector and Hyper-Kamiokande. We develop a general method using minimum square statistics that can compute the sensitivity to any variable affecting neutrino time of flight. We apply this method in two different situations: First, we compare the time spectrum changes due to different neutrino mass values to put limits on electron (anti)neutrino effective mass. Second, we constrain Lorentz invariance violation through the mass scale, $M_{QG}$, at which it would occur. We consider two main neutrino detection techniques: 1. DUNE-like liquid argon TPC, for which the main detection channel is $\nu_e +\, ^{40}\mbox{Ar} \rightarrow e^- +\, ^{40}\mbox{K}^*$, related to the supernova neutronization burst; and 2. HyperK-like water Cherenkov detector, for which $\bar \nu_e + p \rightarrow e^+ + n$ is the main detection channel. We consider a fixed supernova distance of 10~kpc and two different masses of the progenitor star: (i) 15~$M_\odot$ with neutrino emission time up to 0.3~s and (ii) 11.2~$M_\odot$ with neutrino emission time up to 10~s. The best mass limits at 3$\sigma$ are for $\mathcal{O}(1)$~eV. For $\nu_e$, the best limit comes from a DUNE-like detector if the mass ordering happens to be inverted. For $\bar \nu_e$, the best limit comes from a HyperK-like detector. The best limit for the Lorentz invariance violation mass scale at the 3$\sigma$ level considering a superluminal or subluminal effect is $M_{QG} \gtrsim 10^{13}$~GeV ($M_{QG} \gtrsim 5 \times 10^{5}$~GeV) for linear (quadratic) energy dependence. |
1206.0866 | Koichi Yamawaki | Koichi Yamawaki | Composite Avenue beyond the Standard Model - Legacy of Sakata in LHC Era | To appear in the Proceedings of "Shoichi Sakata Centennial Symposium"
October 27-28, 2011, held at Kobayashi-Maskawa Institute for the Origin of
Particles and the Universe (KMI), Nagoya University, Nagoya, Japan: 16 pages;
Progress of Theoretical Physics, Supplement (2012) | null | 10.1143/PTPS.197.76 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Higgs boson may be a composite particle as Sakata vigorously looked for
never-ending substructures of Nature. He proposed the Sakata model for hadrons,
which was the prototype of the quark model and thus lauched the last Revolution
in particle physics continued all the way up to Kabayashi-Maskawa work which
completed the Standard Model today. Inspired by the Sakata's spirit we shall
discuss composite Higgs boson in various models of our own for the dynamical
symmetry breaking with large anomalous dimension: The techni-dilaton in the
walking technicolor (WTC) with $\gamma_m \simeq 1$, the $\bar t t$ composite
("top-Higgs") in the top-quark condensate model with $\gamma_m \simeq 2$, and
their variants in the models with $1<\gamma_m <2$ (strong ETC Technicolor,
etc.). Among others we will focus on WTC which has an approximate scale
symmetry in the region relevant to the dynamical mass generation. Such a
conformal gauge dynamics is characterized by the essential singularity scaling,
breakdown of the Ginzburg-Landau/Gell-Mann-Levy effective theory, and also by a
large anomalous dimension $\gamma_m =1$. In contrast to the folklore that
Technicolor is a "Higgsless theory", there exists a composite Higgs,
techni-dilaton, in the WTC as a composite pseudo Nambu-Goldstone boson
associated with the spontaneously broken (approximate) scale symmetry, with its
mass only arising from the (nonperturbative) scale anomaly and hence being much
smaller than those of other techni-hadrons. The techni-dilaton has a mass
typically of order $500-600 {\rm GeV}$ and can be discovered at LHC. We shall
also touch upon the endeavor to discover WTC on the lattice.
| [
{
"created": "Tue, 5 Jun 2012 10:02:02 GMT",
"version": "v1"
}
] | 2015-06-05 | [
[
"Yamawaki",
"Koichi",
""
]
] | Higgs boson may be a composite particle as Sakata vigorously looked for never-ending substructures of Nature. He proposed the Sakata model for hadrons, which was the prototype of the quark model and thus lauched the last Revolution in particle physics continued all the way up to Kabayashi-Maskawa work which completed the Standard Model today. Inspired by the Sakata's spirit we shall discuss composite Higgs boson in various models of our own for the dynamical symmetry breaking with large anomalous dimension: The techni-dilaton in the walking technicolor (WTC) with $\gamma_m \simeq 1$, the $\bar t t$ composite ("top-Higgs") in the top-quark condensate model with $\gamma_m \simeq 2$, and their variants in the models with $1<\gamma_m <2$ (strong ETC Technicolor, etc.). Among others we will focus on WTC which has an approximate scale symmetry in the region relevant to the dynamical mass generation. Such a conformal gauge dynamics is characterized by the essential singularity scaling, breakdown of the Ginzburg-Landau/Gell-Mann-Levy effective theory, and also by a large anomalous dimension $\gamma_m =1$. In contrast to the folklore that Technicolor is a "Higgsless theory", there exists a composite Higgs, techni-dilaton, in the WTC as a composite pseudo Nambu-Goldstone boson associated with the spontaneously broken (approximate) scale symmetry, with its mass only arising from the (nonperturbative) scale anomaly and hence being much smaller than those of other techni-hadrons. The techni-dilaton has a mass typically of order $500-600 {\rm GeV}$ and can be discovered at LHC. We shall also touch upon the endeavor to discover WTC on the lattice. |
1412.2771 | Robert Schabinger | Ye Li, Andreas von Manteuffel, Robert M. Schabinger, and Hua Xing Zhu | Soft-virtual corrections to Higgs production at N$^3$LO | 22 pages, 1 figure; in v2: added references and corrected eq. (5.2).
v2 is the version published in PRD | Phys. Rev. D 91, 036008 (2015) | 10.1103/PhysRevD.91.036008 | SLAC-PUB-16169, MITP/14-095 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we compute the soft-virtual corrections to Higgs boson
production in gluon fusion for infinite top quark mass at
next-to-next-to-next-to-leading order in QCD. In addition, we present analogous
soft-virtual terms for both Drell-Yan lepton production in QCD and scalar pair
production in N = 4 super Yang-Mills theory. The result for Drell-Yan lepton
production is derived from the result for Higgs boson production using Casimir
scaling arguments together with well-known results available in the literature.
For scalar pair production in the N = 4 model, we show by explicit calculation
that the result is equal to the part of the Higgs boson soft-virtual term which
is of maximal transcendentality weight.
| [
{
"created": "Mon, 8 Dec 2014 21:03:31 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Sep 2015 13:01:29 GMT",
"version": "v2"
}
] | 2015-09-22 | [
[
"Li",
"Ye",
""
],
[
"von Manteuffel",
"Andreas",
""
],
[
"Schabinger",
"Robert M.",
""
],
[
"Zhu",
"Hua Xing",
""
]
] | In this paper, we compute the soft-virtual corrections to Higgs boson production in gluon fusion for infinite top quark mass at next-to-next-to-next-to-leading order in QCD. In addition, we present analogous soft-virtual terms for both Drell-Yan lepton production in QCD and scalar pair production in N = 4 super Yang-Mills theory. The result for Drell-Yan lepton production is derived from the result for Higgs boson production using Casimir scaling arguments together with well-known results available in the literature. For scalar pair production in the N = 4 model, we show by explicit calculation that the result is equal to the part of the Higgs boson soft-virtual term which is of maximal transcendentality weight. |
1205.1280 | Bin Zhang | Sheng-Zhi Zhao, Bin Zhang | Leptonic anomalous gauge couplings detection on electron positron
colliders | 18 pages, 9 figures. feynman rules of $eeWW$ and $vvWW$ vertex
corrected; correspongding results (of $f_7 $and $f_24$) revised | null | 10.1103/PhysRevD.86.035001 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We studied the dimension-6 leptonic anomalous gauge couplings in the
formulation of linearly realized gauge symmetry effective Lagrangian and
investigated the constraints on these anomalous couplings from the existed
experimental data including LEP2 and $W$/$Z$ boson decay. Some bounds of
$O(0.1-10){\rm TeV}^{-2}$ on four relevant anomalous couplings are given by the
Z factories. We studied the sensitivity of testing the leptonic anomalous
couplings via the process $e^+e^-\rightarrow W^+W^-$ at future $e^+e^-$ linear
colliders. We discussed different sensitivities to anomalous couplings at
polarized and unpolarized $e^+e^-$ colliders, respectively, with 500 GeV and 1
TeV collision energy. Our results show that the a 500 GeV ILC can provide a
test of the anomalous couplings, with the same relative uncertainty of cross
section measurement, of $O(0.1-1){\rm TeV}^{-2}$, and a 1 TeV ILC can test the
anomalous couplings of $O(0.01-0.1){\rm TeV}^{-2}$.
| [
{
"created": "Mon, 7 May 2012 04:10:30 GMT",
"version": "v1"
},
{
"created": "Wed, 27 May 2015 05:52:49 GMT",
"version": "v2"
}
] | 2015-05-28 | [
[
"Zhao",
"Sheng-Zhi",
""
],
[
"Zhang",
"Bin",
""
]
] | We studied the dimension-6 leptonic anomalous gauge couplings in the formulation of linearly realized gauge symmetry effective Lagrangian and investigated the constraints on these anomalous couplings from the existed experimental data including LEP2 and $W$/$Z$ boson decay. Some bounds of $O(0.1-10){\rm TeV}^{-2}$ on four relevant anomalous couplings are given by the Z factories. We studied the sensitivity of testing the leptonic anomalous couplings via the process $e^+e^-\rightarrow W^+W^-$ at future $e^+e^-$ linear colliders. We discussed different sensitivities to anomalous couplings at polarized and unpolarized $e^+e^-$ colliders, respectively, with 500 GeV and 1 TeV collision energy. Our results show that the a 500 GeV ILC can provide a test of the anomalous couplings, with the same relative uncertainty of cross section measurement, of $O(0.1-1){\rm TeV}^{-2}$, and a 1 TeV ILC can test the anomalous couplings of $O(0.01-0.1){\rm TeV}^{-2}$. |
1507.07531 | Stefano Profumo | Stefano Profumo | Good NEWS for GeV Dark Matter Searches | 5 pages, 3 figures; accepted for publication in Physical Review D | null | null | null | hep-ph astro-ph.CO astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The proposed NEWS apparatus, a spherical detector with a small central
electrode sensor operating as a proportional counter, promises to explore new
swaths of the direct detection parameter space in the GeV and sub-GeV Dark
Matter particle mass range by employing very light nuclear targets, such as H
and He, and by taking advantage of a very low (sub-keV) energy threshold. Here
we discuss and study two example classes of Dark Matter models that will be
tested with NEWS: GeV-scale millicharged Dark Matter, and a GeV-Dirac Fermion
Dark Matter model with a light (MeV-GeV) scalar or vector mediator, and
indicate the physical regions of parameter space the experiment can probe.
| [
{
"created": "Mon, 27 Jul 2015 19:13:49 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Mar 2016 21:24:02 GMT",
"version": "v2"
}
] | 2016-03-11 | [
[
"Profumo",
"Stefano",
""
]
] | The proposed NEWS apparatus, a spherical detector with a small central electrode sensor operating as a proportional counter, promises to explore new swaths of the direct detection parameter space in the GeV and sub-GeV Dark Matter particle mass range by employing very light nuclear targets, such as H and He, and by taking advantage of a very low (sub-keV) energy threshold. Here we discuss and study two example classes of Dark Matter models that will be tested with NEWS: GeV-scale millicharged Dark Matter, and a GeV-Dirac Fermion Dark Matter model with a light (MeV-GeV) scalar or vector mediator, and indicate the physical regions of parameter space the experiment can probe. |
1310.6218 | Manimala Mitra | Silvia Pascoli, Manimala Mitra, Steven Wong | The Effect of Cancellation in Neutrinoless Double Beta Decay | 25 pages, 14 figures | Phys. Rev. D 90, 093005 (2014) | 10.1103/PhysRevD.90.093005 | IPPP/13/90, DCPT/13/180 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In light of recent experimental results, we carefully analyze the effects of
interference in neutrinoless double beta decay, when more than one mechanism is
operative. We assume a complete cancellation is at work for $^{136}\rm{Xe}$,
and find its implications on the half-life of other isotopes, such as
$^{76}\rm{Ge}$. For definiteness, we consider the role of light and heavy
sterile neutrinos. In this case, the effective Majorana mass parameter can be
redefined to take into account all contributions and its value gets suppressed.
Hence, larger values of neutrino masses are required for the same half-life.
The canonical light neutrino contribution can not saturate the present limits
of half-lives or the positive claim of observation of neutrinoless double beta
decay, once the stringent bounds from cosmology are taken into account. For the
case of cancellation, where all the sterile neutrinos are heavy, the tension
between the results from neutrinoless double beta decay and cosmology becomes
more severe. We show that the inclusion of light sterile neutrinos in this set
up can resolve this issue. Using the recent results from GERDA, we derive upper
limits on the active-sterile mixing angles and compare it with the case of no
cancellation. The required values of the mixing angles become larger, if a
cancellation is at work. A direct test of destructive interference in
$^{136}\rm{Xe}$ is provided by the observation of this process in other
isotopes and we study in detail the correlation between their half-lives.
Finally, we discuss the model realizations which can accommodate light and
heavy sterile neutrinos and the cancellation. We show that sterile neutrinos of
few hundred MeV or GeV mass range, coming from an Extended seesaw framework or
a further extension, can satisfy the required cancellation.
| [
{
"created": "Wed, 23 Oct 2013 13:28:27 GMT",
"version": "v1"
}
] | 2014-11-19 | [
[
"Pascoli",
"Silvia",
""
],
[
"Mitra",
"Manimala",
""
],
[
"Wong",
"Steven",
""
]
] | In light of recent experimental results, we carefully analyze the effects of interference in neutrinoless double beta decay, when more than one mechanism is operative. We assume a complete cancellation is at work for $^{136}\rm{Xe}$, and find its implications on the half-life of other isotopes, such as $^{76}\rm{Ge}$. For definiteness, we consider the role of light and heavy sterile neutrinos. In this case, the effective Majorana mass parameter can be redefined to take into account all contributions and its value gets suppressed. Hence, larger values of neutrino masses are required for the same half-life. The canonical light neutrino contribution can not saturate the present limits of half-lives or the positive claim of observation of neutrinoless double beta decay, once the stringent bounds from cosmology are taken into account. For the case of cancellation, where all the sterile neutrinos are heavy, the tension between the results from neutrinoless double beta decay and cosmology becomes more severe. We show that the inclusion of light sterile neutrinos in this set up can resolve this issue. Using the recent results from GERDA, we derive upper limits on the active-sterile mixing angles and compare it with the case of no cancellation. The required values of the mixing angles become larger, if a cancellation is at work. A direct test of destructive interference in $^{136}\rm{Xe}$ is provided by the observation of this process in other isotopes and we study in detail the correlation between their half-lives. Finally, we discuss the model realizations which can accommodate light and heavy sterile neutrinos and the cancellation. We show that sterile neutrinos of few hundred MeV or GeV mass range, coming from an Extended seesaw framework or a further extension, can satisfy the required cancellation. |
hep-ph/9505220 | Daniel Boyanovsky | D. Boyanovsky, M. D'Attanasio, H.J. de Vega, R. Holman, D.S.-Lee, and
A. Singh | Reheating the Post Inflationary Universe | 9 pages, revtex 3.0, 3 figures available upon request | null | null | PITT-09-95, CMU-95-03, DOE-ER/40682-92, LPTHE-95-18, UPRF-95-420 | hep-ph astro-ph | null | We consider the non-equilibrium evolution of the inflaton field coupled to
both lighter scalars and fermions. The dissipational dynamics of this field is
studied and found to be quite different than that believed in inflationary
models. In particular, the damping time scale for the expectation value of the
zero momentum mode of the inflaton can be much shorter than that given by the
single particle decay rate when the inflaton amplitudes are large, as in
chaotic inflation scenarios. We find that the reheating temperature may depart
considerably from the usual estimates.
| [
{
"created": "Wed, 3 May 1995 13:50:56 GMT",
"version": "v1"
}
] | 2009-09-25 | [
[
"Boyanovsky",
"D.",
""
],
[
"D'Attanasio",
"M.",
""
],
[
"de Vega",
"H. J.",
""
],
[
"Holman",
"R.",
""
],
[
"-Lee",
"D. S.",
""
],
[
"Singh",
"A.",
""
]
] | We consider the non-equilibrium evolution of the inflaton field coupled to both lighter scalars and fermions. The dissipational dynamics of this field is studied and found to be quite different than that believed in inflationary models. In particular, the damping time scale for the expectation value of the zero momentum mode of the inflaton can be much shorter than that given by the single particle decay rate when the inflaton amplitudes are large, as in chaotic inflation scenarios. We find that the reheating temperature may depart considerably from the usual estimates. |
2406.11042 | Giorgio Arcadi | Giorgio Arcadi | Thermal and non-thermal DM production in non-Standard Cosmologies: a
mini review | 15 pages, 3 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We provide a short review of some aspects of Dark Matter production in non
Standard Cosmology. Considering the simplest Higgs portal model as definite
particle physics setup, we consider the impact on the parameter space
corresponding to the correct relic density, and the complementary experimental
constraints, of the presence, during thermal production, of an exotic component
dominating the energy density of the Universe. In the second part of the work
we will focus on the case that such exotic component satisfies the equation of
state of matter and it can produce DM non-thermally.
| [
{
"created": "Sun, 16 Jun 2024 18:54:56 GMT",
"version": "v1"
}
] | 2024-06-18 | [
[
"Arcadi",
"Giorgio",
""
]
] | We provide a short review of some aspects of Dark Matter production in non Standard Cosmology. Considering the simplest Higgs portal model as definite particle physics setup, we consider the impact on the parameter space corresponding to the correct relic density, and the complementary experimental constraints, of the presence, during thermal production, of an exotic component dominating the energy density of the Universe. In the second part of the work we will focus on the case that such exotic component satisfies the equation of state of matter and it can produce DM non-thermally. |
hep-ph/9902286 | Wei Lu | Pervez Hoodbhoy and Wei Lu | Electroproduction of Transversely Polarized Vector Mesons Via A Quantum
Mechanical Anomaly | 12 pages, RevTex | null | null | UMD PP#99-087, DOE/ER/40762-175 | hep-ph | null | By explicit calculation we demonstrate that, in variance with the classical
prediction, the leading twist contribution to the exclusive electroproduction
of transversely polarized vector mesons from the nucleon does not vanish beyond
the leading order in perturbation theory. This appears to be due to a
quantum-mechanical anomaly, in the sense that a classical symmetry of the field
theory is broken by quantum corrections.
| [
{
"created": "Tue, 9 Feb 1999 19:49:15 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Feb 1999 17:27:26 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Hoodbhoy",
"Pervez",
""
],
[
"Lu",
"Wei",
""
]
] | By explicit calculation we demonstrate that, in variance with the classical prediction, the leading twist contribution to the exclusive electroproduction of transversely polarized vector mesons from the nucleon does not vanish beyond the leading order in perturbation theory. This appears to be due to a quantum-mechanical anomaly, in the sense that a classical symmetry of the field theory is broken by quantum corrections. |
0906.0372 | Christian Kurz | Ansgar Denner, Stefan Dittmaier, Thomas Gehrmann, Christian Kurz | Electroweak corrections to three-jet production in electron-positron
annihilation | 5 pages, 4 figures. v2: changed normalisation in Fig. 2, minor text
revisions, version to appear in Phys.Lett. B | Phys.Lett.B679:219-222,2009 | 10.1016/j.physletb.2009.07.037 | PSI-PR-09-09, ZU-TH 08/09 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute the electroweak ${\cal O}(\alpha^3\alpha_s)$ corrections to
three-jet production and related event-shape observables at electron-positron
colliders. We properly account for the experimental photon isolation criteria
and for the corrections to the total hadronic cross section. Corrections to the
three-jet rate and to normalised event-shape distributions turn out to be at
the few-per-cent level.
| [
{
"created": "Mon, 1 Jun 2009 20:29:53 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Aug 2009 10:51:02 GMT",
"version": "v2"
}
] | 2009-09-28 | [
[
"Denner",
"Ansgar",
""
],
[
"Dittmaier",
"Stefan",
""
],
[
"Gehrmann",
"Thomas",
""
],
[
"Kurz",
"Christian",
""
]
] | We compute the electroweak ${\cal O}(\alpha^3\alpha_s)$ corrections to three-jet production and related event-shape observables at electron-positron colliders. We properly account for the experimental photon isolation criteria and for the corrections to the total hadronic cross section. Corrections to the three-jet rate and to normalised event-shape distributions turn out to be at the few-per-cent level. |
1403.3044 | Nestor Quintero | Nestor Quintero, J. Lorenzo Diaz-Cruz, and Gabriel Lopez Castro | Lepton pair emission in the top quark decay $t \to bW^+\ell^-\ell^+$ | 9 pages, 4 figures, v2: comments and references added, matches with
version accepted in Phys. Rev. D | Phys. Rev. D 89, 093014 (2014) | 10.1103/PhysRevD.89.093014 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The heaviness of the top quark makes its 2-body decay mode $t \to bW^+$ to be
dominant, at such level that hardly any other decay mode reaches a detectable
branching ratio (BR) within the SM. Here we study the decay $t \to
bW^+\ell^-\ell^+$ ($\ell=e, \mu, \tau$), which diverges for massless leptons,
and it can reach a BR $\sim \mathcal{O}(10^{-5}\sim 10^{-6})$ for reasonable
values of the low energy cut in the lepton-pair invariant mass. This rate
surpasses almost any other rare decays such as $t \to cX$ ($X=\gamma,Z,g,H,
W^+W^-$), and thus offers the possibility of being detectable. Furthermore, the
estimate of this channel is relevant because it can mimic the signal arising
from the lepton number violating decay $t\to bW^-\ell^+\ell^+$, when the $W$
boson decays into lepton channels.
| [
{
"created": "Wed, 12 Mar 2014 17:45:28 GMT",
"version": "v1"
},
{
"created": "Mon, 19 May 2014 23:26:22 GMT",
"version": "v2"
}
] | 2014-05-21 | [
[
"Quintero",
"Nestor",
""
],
[
"Diaz-Cruz",
"J. Lorenzo",
""
],
[
"Castro",
"Gabriel Lopez",
""
]
] | The heaviness of the top quark makes its 2-body decay mode $t \to bW^+$ to be dominant, at such level that hardly any other decay mode reaches a detectable branching ratio (BR) within the SM. Here we study the decay $t \to bW^+\ell^-\ell^+$ ($\ell=e, \mu, \tau$), which diverges for massless leptons, and it can reach a BR $\sim \mathcal{O}(10^{-5}\sim 10^{-6})$ for reasonable values of the low energy cut in the lepton-pair invariant mass. This rate surpasses almost any other rare decays such as $t \to cX$ ($X=\gamma,Z,g,H, W^+W^-$), and thus offers the possibility of being detectable. Furthermore, the estimate of this channel is relevant because it can mimic the signal arising from the lepton number violating decay $t\to bW^-\ell^+\ell^+$, when the $W$ boson decays into lepton channels. |
0909.5229 | Hai-Yang Cheng | Hai-Yang Cheng, Chun-Khiang Chua | Revisiting Charmless Hadronic B_{u,d} Decays in QCD Factorization | 51 pages, 1 figure | Phys.Rev.D80:114008,2009 | 10.1103/PhysRevD.80.114008 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Within the framework of QCD factorization (QCDF), we consider two different
types of power correction effects in order to resolve the CP puzzles and rate
deficit problems with penguin-dominated two-body decays of B mesons and
color-suppressed tree-dominated $\pi^0\pi^0$ and $\rho^0\pi^0$ modes: penguin
annihilation and soft corrections to the color-suppressed tree amplitude. We
emphasize that the electroweak penguin solution to the $B\to K\pi$ CP puzzle
via New Physics is irrelevant for solving the CP and rate puzzles related to
tree-dominated decays. While some channels e.g.
$K^-\pi^+,K^-\rho^0,\pi^+\pi^-,\rho^\pm\pi^\mp$ need penguin annihilation to
induce the correct magnitudes and signs for their CP violation, some other
decays such as $B^-\to K^-\pi^0,\pi^-\eta, K^-\eta$ and $\bar B^0\to \bar
K^{*0}\eta,\pi^0\pi^0$ require the presence of both power corrections to
account for the measured CP asymmetries. In general, QCDF predictions for the
branching fractions and direct CP asymmetries of $\bar B\to PP,VP,VV$ decays
are in good agreement with experiment. The predictions of pQCD and
soft-collinear effective theory are included for comparison.
| [
{
"created": "Mon, 28 Sep 2009 22:06:18 GMT",
"version": "v1"
}
] | 2014-11-20 | [
[
"Cheng",
"Hai-Yang",
""
],
[
"Chua",
"Chun-Khiang",
""
]
] | Within the framework of QCD factorization (QCDF), we consider two different types of power correction effects in order to resolve the CP puzzles and rate deficit problems with penguin-dominated two-body decays of B mesons and color-suppressed tree-dominated $\pi^0\pi^0$ and $\rho^0\pi^0$ modes: penguin annihilation and soft corrections to the color-suppressed tree amplitude. We emphasize that the electroweak penguin solution to the $B\to K\pi$ CP puzzle via New Physics is irrelevant for solving the CP and rate puzzles related to tree-dominated decays. While some channels e.g. $K^-\pi^+,K^-\rho^0,\pi^+\pi^-,\rho^\pm\pi^\mp$ need penguin annihilation to induce the correct magnitudes and signs for their CP violation, some other decays such as $B^-\to K^-\pi^0,\pi^-\eta, K^-\eta$ and $\bar B^0\to \bar K^{*0}\eta,\pi^0\pi^0$ require the presence of both power corrections to account for the measured CP asymmetries. In general, QCDF predictions for the branching fractions and direct CP asymmetries of $\bar B\to PP,VP,VV$ decays are in good agreement with experiment. The predictions of pQCD and soft-collinear effective theory are included for comparison. |
2104.02730 | Antonio Enrique C\'arcamo Hern\'andez | A. E. C\'arcamo Hern\'andez, Catalina Espinoza, Juan Carlos
G\'omez-Izquierdo, Myriam Mondrag\'on | Fermion masses and mixings, dark matter, leptogenesis and $g-2$ muon
anomaly in an extended 2HDM with inverse seesaw | Substantial improvement to the overall content of the paper specially
in sections regarding dark matter, analysis of fermion and scalar sectors.
Detailed explanation of the possible UV completion of the model as well as
about the muon electric dipole moment. Discussions enlarged, new figures,
references and appendices added. 35 pages. Matches published version in EPJP | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a predictive $Q_4$ flavored 2HDM model, where the scalar sector is
enlarged by the inclusion of several gauge singlet scalars and the fermion
sector by the inclusion of right handed Majorana neutrinos. In our model, the
$Q_4$ family symmetry is supplemented by several auxiliary cyclic symmetries,
whose spontaneous breaking produces the observed pattern of SM charged fermion
masses and quark mixing angles. The light active neutrino masses are generated
from an inverse seesaw mechanism at one loop level thanks to a remnant
preserved $Z_2$ symmetry. Our model succesfully reproduces the measured dark
matter relic abundance and is consistent with direct detection constraints for
masses of the DM candidate around $\sim$ 6.3 TeV. Furthermore, our model is
also consistent with the lepton and baryon asymmetries of the Universe as well
as with the muon anomalous magnetic moment
| [
{
"created": "Tue, 6 Apr 2021 18:00:22 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Apr 2021 17:59:16 GMT",
"version": "v2"
},
{
"created": "Mon, 14 Nov 2022 14:49:55 GMT",
"version": "v3"
}
] | 2022-11-15 | [
[
"Hernández",
"A. E. Cárcamo",
""
],
[
"Espinoza",
"Catalina",
""
],
[
"Gómez-Izquierdo",
"Juan Carlos",
""
],
[
"Mondragón",
"Myriam",
""
]
] | We propose a predictive $Q_4$ flavored 2HDM model, where the scalar sector is enlarged by the inclusion of several gauge singlet scalars and the fermion sector by the inclusion of right handed Majorana neutrinos. In our model, the $Q_4$ family symmetry is supplemented by several auxiliary cyclic symmetries, whose spontaneous breaking produces the observed pattern of SM charged fermion masses and quark mixing angles. The light active neutrino masses are generated from an inverse seesaw mechanism at one loop level thanks to a remnant preserved $Z_2$ symmetry. Our model succesfully reproduces the measured dark matter relic abundance and is consistent with direct detection constraints for masses of the DM candidate around $\sim$ 6.3 TeV. Furthermore, our model is also consistent with the lepton and baryon asymmetries of the Universe as well as with the muon anomalous magnetic moment |
1801.05192 | Sven Heinemeyer | S. Heinemeyer, C. Schappacher | Production of Electroweak SUSY Particles at ILC and CLIC | 17 pages, 7 figures. Talk presented at the International Workshop on
Future Linear Colliders (LCWS2017), Strasbourg, France, 23-27 October 2017.
C17-10-23.2 (based on arXiv:1704.07627) | null | null | IFT-UAM/CSIC-18-006 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | For the search for electroweak particles in the Minimal Supersymmetric
Standard Model (MSSM) as well as for future precision analyses of these
particles an accurate knowledge of their production and decay properties is
mandatory. We review the evaluation of the cross sections for the chargino,
neutralino and scalar lepton production at e+e- colliders in the MSSM with
complex parameters (cMSSM). The evaluation is based on a full one-loop
calculation of the various production mechanisms, including soft and hard
photon radiation. The dependence of the chargino/neutralino/slepton cross
sections on the relevant cMSSM parameters is analyzed numerically. We find
sizable contributions to many production cross sections. They amount roughly +-
15% of the tree-level results, but can go up to +-40% or higher in extreme
cases. Also the complex phase dependence of the one-loop corrections was found
non-negligible. The full one-loop contributions are thus crucial for physics
analyses at a future linear e+e- collider such as the ILC or CLIC.
| [
{
"created": "Tue, 16 Jan 2018 10:19:16 GMT",
"version": "v1"
}
] | 2018-01-17 | [
[
"Heinemeyer",
"S.",
""
],
[
"Schappacher",
"C.",
""
]
] | For the search for electroweak particles in the Minimal Supersymmetric Standard Model (MSSM) as well as for future precision analyses of these particles an accurate knowledge of their production and decay properties is mandatory. We review the evaluation of the cross sections for the chargino, neutralino and scalar lepton production at e+e- colliders in the MSSM with complex parameters (cMSSM). The evaluation is based on a full one-loop calculation of the various production mechanisms, including soft and hard photon radiation. The dependence of the chargino/neutralino/slepton cross sections on the relevant cMSSM parameters is analyzed numerically. We find sizable contributions to many production cross sections. They amount roughly +- 15% of the tree-level results, but can go up to +-40% or higher in extreme cases. Also the complex phase dependence of the one-loop corrections was found non-negligible. The full one-loop contributions are thus crucial for physics analyses at a future linear e+e- collider such as the ILC or CLIC. |
1903.11902 | Jianwei Qiu | Jian-Wei Qiu | Nucleon Structure from Lattice QCD Calculations | 8 pages, 5 figures, to be published in the proceedings of the 8th
International Conference on Quarks and Nuclear Physics, November 13-17, 2019,
Tsukuba, Japan | null | 10.7566/JPSCP.26.011010 | JLAB-THY-19-2908 | hep-ph hep-lat nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Parton distribution and correlation functions describe the relation between a
hadron and the quarks and gluons (or collectively, the partons) within it, and
carry rich information on hadron's partonic structure that cannot be calculated
by QCD perturbation theory. In this talk, I will review what lattice QCD can
and cannot do for calculating the parton distribution and correlation
functions, and the new ideas and efforts around the world to explore nucleon
structure from lattice QCD calculations by combining the strength of both
lattice QCD and perturbative QCD in such a way that is complementary to our
on-going effort to extract these fundamental functions from experimental data.
| [
{
"created": "Thu, 28 Mar 2019 11:24:57 GMT",
"version": "v1"
}
] | 2020-01-08 | [
[
"Qiu",
"Jian-Wei",
""
]
] | Parton distribution and correlation functions describe the relation between a hadron and the quarks and gluons (or collectively, the partons) within it, and carry rich information on hadron's partonic structure that cannot be calculated by QCD perturbation theory. In this talk, I will review what lattice QCD can and cannot do for calculating the parton distribution and correlation functions, and the new ideas and efforts around the world to explore nucleon structure from lattice QCD calculations by combining the strength of both lattice QCD and perturbative QCD in such a way that is complementary to our on-going effort to extract these fundamental functions from experimental data. |
hep-ph/9502330 | Apostolos Pilaftsis | Apostolos Pilaftsis | CONFRONTING LEFT-RIGHT SYMMETRIC MODELS WITH ELECTROWEAK PRECISION DATA
AT THE Z PEAK | 24 pages (4 figures available upon request) | Phys.Rev. D52 (1995) 459-471 | 10.1103/PhysRevD.52.459 | RAL/95-014. | hep-ph | null | In view of the recent and future electroweak precision data accumulated at
LEP and SLC, we systematically analyze possible new physics effects that may
occur in the leptonic sector within the context of $SU(2)_R \times SU(2)_L
\times U(1)_{B-L}$ theories. It is shown that nonobservation of
flavour-violating $Z$-boson decays, lepton universality in the decays $Z\to
l\bar{l}$, and universality of lepton asymmetries at the $Z$ peak form a set of
complementary observables, yielding severe constraints on the parameter space
of these theories. Contributions of new-physics effects to $R_b=\Gamma(Z\to
b\bar{b})/\Gamma(Z\to \mbox{hadrons})$ are found to give interesting mass
relations for the flavour-changing Higgs scalars present in these models.
| [
{
"created": "Thu, 16 Feb 1995 18:30:30 GMT",
"version": "v1"
}
] | 2016-09-01 | [
[
"Pilaftsis",
"Apostolos",
""
]
] | In view of the recent and future electroweak precision data accumulated at LEP and SLC, we systematically analyze possible new physics effects that may occur in the leptonic sector within the context of $SU(2)_R \times SU(2)_L \times U(1)_{B-L}$ theories. It is shown that nonobservation of flavour-violating $Z$-boson decays, lepton universality in the decays $Z\to l\bar{l}$, and universality of lepton asymmetries at the $Z$ peak form a set of complementary observables, yielding severe constraints on the parameter space of these theories. Contributions of new-physics effects to $R_b=\Gamma(Z\to b\bar{b})/\Gamma(Z\to \mbox{hadrons})$ are found to give interesting mass relations for the flavour-changing Higgs scalars present in these models. |
0707.1506 | Daniel de Florian | Daniel de Florian, Rodolfo Sassot, Marco Stratmann | Global Analysis of Fragmentation Functions for Protons and Charged
Hadrons | 14 pages, 14 figures | Phys.Rev.D76:074033,2007 | 10.1103/PhysRevD.76.074033 | null | hep-ph | null | We present new sets of fragmentation functions for protons and inclusive
charged hadrons obtained in combined NLO QCD analyses of single-inclusive
hadron production in electron-positron annihilation, proton-proton collisions,
and deep-inelastic lepton-proton scattering. These analyses complement previous
results for pion and kaon fragmentation functions with charge and flavor
discrimination. The Lagrange multiplier technique is used to assess the
uncertainties in the extraction of the new sets of fragmentation functions.
| [
{
"created": "Tue, 10 Jul 2007 17:56:51 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"de Florian",
"Daniel",
""
],
[
"Sassot",
"Rodolfo",
""
],
[
"Stratmann",
"Marco",
""
]
] | We present new sets of fragmentation functions for protons and inclusive charged hadrons obtained in combined NLO QCD analyses of single-inclusive hadron production in electron-positron annihilation, proton-proton collisions, and deep-inelastic lepton-proton scattering. These analyses complement previous results for pion and kaon fragmentation functions with charge and flavor discrimination. The Lagrange multiplier technique is used to assess the uncertainties in the extraction of the new sets of fragmentation functions. |
hep-ph/0101182 | null | I.M. Dremin, O.V. Ivanov, and V.A. Nechitailo (Lebedev Physical
Institute) | Wavelets and their use | 63 pages with 22 ps-figures, to be published in Physics-Uspekhi | null | 10.1070/PU2001v044n05ABEH000918 | FIAN/TD-22/00 | hep-ph cond-mat math-ph math.MP math.NA nlin.CD physics.comp-ph | null | This review paper is intended to give a useful guide for those who want to
apply discrete wavelets in their practice. The notion of wavelets and their use
in practical computing and various applications are briefly described, but
rigorous proofs of mathematical statements are omitted, and the reader is just
referred to corresponding literature. The multiresolution analysis and fast
wavelet transform became a standard procedure for dealing with discrete
wavelets. The proper choice of a wavelet and use of nonstandard matrix
multiplication are often crucial for achievement of a goal. Analysis of various
functions with the help of wavelets allows to reveal fractal structures,
singularities etc. Wavelet transform of operator expressions helps solve some
equations. In practical applications one deals often with the discretized
functions, and the problem of stability of wavelet transform and corresponding
numerical algorithms becomes important. After discussing all these topics we
turn to practical applications of the wavelet machinery. They are so numerous
that we have to limit ourselves by some examples only. The authors would be
grateful for any comments which improve this review paper and move us closer to
the goal proclaimed in the first phrase of the abstract.
| [
{
"created": "Tue, 16 Jan 2001 17:11:38 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Dremin",
"I. M.",
"",
"Lebedev Physical\n Institute"
],
[
"Ivanov",
"O. V.",
"",
"Lebedev Physical\n Institute"
],
[
"Nechitailo",
"V. A.",
"",
"Lebedev Physical\n Institute"
]
] | This review paper is intended to give a useful guide for those who want to apply discrete wavelets in their practice. The notion of wavelets and their use in practical computing and various applications are briefly described, but rigorous proofs of mathematical statements are omitted, and the reader is just referred to corresponding literature. The multiresolution analysis and fast wavelet transform became a standard procedure for dealing with discrete wavelets. The proper choice of a wavelet and use of nonstandard matrix multiplication are often crucial for achievement of a goal. Analysis of various functions with the help of wavelets allows to reveal fractal structures, singularities etc. Wavelet transform of operator expressions helps solve some equations. In practical applications one deals often with the discretized functions, and the problem of stability of wavelet transform and corresponding numerical algorithms becomes important. After discussing all these topics we turn to practical applications of the wavelet machinery. They are so numerous that we have to limit ourselves by some examples only. The authors would be grateful for any comments which improve this review paper and move us closer to the goal proclaimed in the first phrase of the abstract. |
1110.3228 | J\"urgen Rohrwild | M. Beneke and J. Rohrwild | B meson distribution amplitude from B --> \gamma l \nu | 15 pages, 5 figures | null | 10.1140/epjc/s10052-011-1818-8 | TTK-11-51, SFB/CPP-11-56 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We reconsider the utility of the radiative decay $B \to \gamma \ell \nu$ with
an energetic photon in the final state for determining parameters of the
$B$-meson light-cone distribution amplitude. Including $1/m_b$ power
corrections and radiative corrections at next-to-leading logarithmic order, we
perform an improved analysis of the existing BABAR data. We find a provisional
lower limit on the inverse moment of the $B$ meson distribution amplitude,
$\lambda_B$, which, due to the inclusion of radiative and power corrections, is
significantly lower than the previous result. More data with large photon
energy is, however, required to obtain reliable results, as should become
available in the future from SuperB factories.
| [
{
"created": "Fri, 14 Oct 2011 14:52:42 GMT",
"version": "v1"
}
] | 2015-05-30 | [
[
"Beneke",
"M.",
""
],
[
"Rohrwild",
"J.",
""
]
] | We reconsider the utility of the radiative decay $B \to \gamma \ell \nu$ with an energetic photon in the final state for determining parameters of the $B$-meson light-cone distribution amplitude. Including $1/m_b$ power corrections and radiative corrections at next-to-leading logarithmic order, we perform an improved analysis of the existing BABAR data. We find a provisional lower limit on the inverse moment of the $B$ meson distribution amplitude, $\lambda_B$, which, due to the inclusion of radiative and power corrections, is significantly lower than the previous result. More data with large photon energy is, however, required to obtain reliable results, as should become available in the future from SuperB factories. |
1001.0486 | Masaki Asano | Masaki Asano and Ryuichiro Kitano | Constraints on Scalar Phantoms | 7 pages, 1 figure | Phys.Rev.D81:054506,2010 | 10.1103/PhysRevD.81.054506 | TU-862 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We update the constraints on the minimal model of dark matter, where a stable
real scalar field is added to the standard model Lagrangian with a
renormalizable coupling to the Higgs field. Once we fix the dark matter
abundance, there are only two relevant model parameters, the mass of the scalar
field and that of the Higgs boson. The recent data from the CDMS II experiment
have excluded a parameter region where the scalar field is light such as less
than about 50 GeV. In a large parameter region, the consistency of the model
can be tested by the combination of future direct detection experiments and the
LHC experiments.
| [
{
"created": "Mon, 4 Jan 2010 20:03:49 GMT",
"version": "v1"
}
] | 2010-04-29 | [
[
"Asano",
"Masaki",
""
],
[
"Kitano",
"Ryuichiro",
""
]
] | We update the constraints on the minimal model of dark matter, where a stable real scalar field is added to the standard model Lagrangian with a renormalizable coupling to the Higgs field. Once we fix the dark matter abundance, there are only two relevant model parameters, the mass of the scalar field and that of the Higgs boson. The recent data from the CDMS II experiment have excluded a parameter region where the scalar field is light such as less than about 50 GeV. In a large parameter region, the consistency of the model can be tested by the combination of future direct detection experiments and the LHC experiments. |
hep-ph/0502236 | Xiang Liu | Xiao-Gang He, Xue-Qian Li, Xiang Liu and Xiao-Qian Zeng | Mixing of Pentaquark and Molecular States | 23 pages, 4 figures. Published version in EPJC | Eur.Phys.J.C44:419-430,2005; Erratum-ibid.C44:459,2005 | 10.1140/epjc/s2005-02383-9 10.1140/epjc/s2005-02420-9 | null | hep-ph | null | There are experimental evidences for the existence of narrow states
$\Theta^+$ and $\Theta_c$ with the same quantum numbers of $uudd\bar s$ and
$uudd\bar c$ pentaquarks and also $NK^{(*)}$ and $ND^{(*)}$ molecular states.
Their masses deviate from many theoretical estimates of the pure pentaquark and
molecular states. In this work we study the possibility that the observed
$\Theta^+$ and $\Theta_c$ are mixtures of pure pentaquark and molecular states.
The mixing parameters are in general related to non-perturbative QCD which are
not calculable at present. We determine them by fitting data from known states
and then generalize the mechanism to $\Theta_b$ to predict its mass and width.
The mixing mechanism can also naturally explain the narrow width for $\Theta^+$
and $\Theta_c$ through destructive interferences, even if the pure pentaquark
and molecular states have much larger decay widths. We also briefly discuss the
properties of the partner eigenstates of $\Theta^+$ and $\Theta_c$ and the
possibility of experimentally observe them. Moreover, probable consequences of
multi-state mixing are also addressed.
| [
{
"created": "Sat, 26 Feb 2005 02:47:53 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Sep 2005 08:54:35 GMT",
"version": "v2"
}
] | 2014-11-18 | [
[
"He",
"Xiao-Gang",
""
],
[
"Li",
"Xue-Qian",
""
],
[
"Liu",
"Xiang",
""
],
[
"Zeng",
"Xiao-Qian",
""
]
] | There are experimental evidences for the existence of narrow states $\Theta^+$ and $\Theta_c$ with the same quantum numbers of $uudd\bar s$ and $uudd\bar c$ pentaquarks and also $NK^{(*)}$ and $ND^{(*)}$ molecular states. Their masses deviate from many theoretical estimates of the pure pentaquark and molecular states. In this work we study the possibility that the observed $\Theta^+$ and $\Theta_c$ are mixtures of pure pentaquark and molecular states. The mixing parameters are in general related to non-perturbative QCD which are not calculable at present. We determine them by fitting data from known states and then generalize the mechanism to $\Theta_b$ to predict its mass and width. The mixing mechanism can also naturally explain the narrow width for $\Theta^+$ and $\Theta_c$ through destructive interferences, even if the pure pentaquark and molecular states have much larger decay widths. We also briefly discuss the properties of the partner eigenstates of $\Theta^+$ and $\Theta_c$ and the possibility of experimentally observe them. Moreover, probable consequences of multi-state mixing are also addressed. |
hep-ph/0306007 | Marc Vanderhaeghen | P.A.M. Guichon and M. Vanderhaeghen | How to reconcile the Rosenbluth and the polarization transfer method in
the measurement of the proton form factors | 4 pages, 4 figures. Version accepted for publication in Phys. Rev.
Lett | Phys.Rev.Lett. 91 (2003) 142303 | 10.1103/PhysRevLett.91.142303 | DAPNIA-03-109, MKPH-T-03-09 | hep-ph | null | The apparent discrepancy between the Rosenbluth and the polarization transfer
method for the ratio of the electric to magnetic proton form factors can be
explained by a two-photon exchange correction which does not destroy the
linearity of the Rosenbluth plot. Though intrinsically small, of the order of a
few percent of the cross section, this correction is kinematically enhanced in
the Rosenbluth method while it is small for the polarization transfer method,
at least in the range of (Q^2) where it has been used until now.
| [
{
"created": "Sun, 1 Jun 2003 16:33:18 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Jun 2003 16:52:33 GMT",
"version": "v2"
},
{
"created": "Mon, 25 Aug 2003 21:02:42 GMT",
"version": "v3"
}
] | 2016-09-06 | [
[
"Guichon",
"P. A. M.",
""
],
[
"Vanderhaeghen",
"M.",
""
]
] | The apparent discrepancy between the Rosenbluth and the polarization transfer method for the ratio of the electric to magnetic proton form factors can be explained by a two-photon exchange correction which does not destroy the linearity of the Rosenbluth plot. Though intrinsically small, of the order of a few percent of the cross section, this correction is kinematically enhanced in the Rosenbluth method while it is small for the polarization transfer method, at least in the range of (Q^2) where it has been used until now. |
1303.4364 | Vitaly Velizhanin | A.V. Bednyakov, A.F. Pikelner and V.N. Velizhanin | Higgs self-coupling beta-function in the Standard Model at three loops | 15 pages, 1 figure, Mathematica outputs attached. Ancillary files
rearranged. arXiv admin note: text overlap with arXiv:1212.6829 | null | 10.1016/j.nuclphysb.2013.07.015 | null | hep-ph hep-ex hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the results for three-loop beta-function for the Higgs
self-coupling calculated within the unbroken phase of the Standard Model. We
also provide the expression for three-loop beta-function of the Higgs mass
parameter, which is obtained as a by-product of our main calculation. Our
results coincide with that of recent paper arXiv:1303.2890. In addition, the
expression for the Higgs field anomalous dimension is given.
| [
{
"created": "Mon, 18 Mar 2013 19:11:13 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Mar 2013 12:01:58 GMT",
"version": "v2"
}
] | 2015-06-15 | [
[
"Bednyakov",
"A. V.",
""
],
[
"Pikelner",
"A. F.",
""
],
[
"Velizhanin",
"V. N.",
""
]
] | We present the results for three-loop beta-function for the Higgs self-coupling calculated within the unbroken phase of the Standard Model. We also provide the expression for three-loop beta-function of the Higgs mass parameter, which is obtained as a by-product of our main calculation. Our results coincide with that of recent paper arXiv:1303.2890. In addition, the expression for the Higgs field anomalous dimension is given. |
1701.05900 | Juan Antonio Aguilar-Saavedra | J.A. Aguilar-Saavedra, C. Degrande, S. Khatibi | Single top polarisation as a window to new physics | LaTeX 10 pages. v2: comments and references added, journal version | null | 10.1016/j.physletb.2017.04.023 | CERN-TH-2017-013 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the effect of heavy new physics, parameterised in terms of
four-fermion operators, in the polarisation of single top (anti-)quarks in the
$t$-channel process at the LHC. It is found that for operators involving a
right-handed top quark field the relative effect on the longitudinal
polarisation is twice larger than the relative effect on the total cross
section. This enhanced dependence on possible four-fermion contributions makes
the polarisation measurements specially interesting, in particular at high
momenta.
| [
{
"created": "Fri, 20 Jan 2017 19:00:01 GMT",
"version": "v1"
},
{
"created": "Sat, 15 Apr 2017 16:37:02 GMT",
"version": "v2"
}
] | 2017-04-19 | [
[
"Aguilar-Saavedra",
"J. A.",
""
],
[
"Degrande",
"C.",
""
],
[
"Khatibi",
"S.",
""
]
] | We discuss the effect of heavy new physics, parameterised in terms of four-fermion operators, in the polarisation of single top (anti-)quarks in the $t$-channel process at the LHC. It is found that for operators involving a right-handed top quark field the relative effect on the longitudinal polarisation is twice larger than the relative effect on the total cross section. This enhanced dependence on possible four-fermion contributions makes the polarisation measurements specially interesting, in particular at high momenta. |
hep-ph/9505408 | Jiri Chyla | Jiri Chyla | On the BLM scale-fixing procedure, its generalizations and "genuine"
higher order corrections | latex, 10 pages | Phys.Lett.B356:341-348,1995 | 10.1016/0370-2693(95)00828-9 | PRA-HEP/95-4 | hep-ph | null | The question of the uniqueness of the Brodsky--Lepage--Mackenzie procedure
for fixing the renormalization scale in perturbative QCD is discussed. It is
shown that the resulting finite order approximants are as ambiguous as the
original truncated perturbative expansions. This inherent ambiguity of the BLM
procedure undermines the recent attempts to define ``genuine'' higher order
perturbative corrections.
| [
{
"created": "Tue, 30 May 1995 09:47:13 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Chyla",
"Jiri",
""
]
] | The question of the uniqueness of the Brodsky--Lepage--Mackenzie procedure for fixing the renormalization scale in perturbative QCD is discussed. It is shown that the resulting finite order approximants are as ambiguous as the original truncated perturbative expansions. This inherent ambiguity of the BLM procedure undermines the recent attempts to define ``genuine'' higher order perturbative corrections. |
1302.1711 | Steffen Gielen | Steffen Gielen | Comment on "Causality-violating Higgs singlets at the LHC" | 2 pages, 2 figures, APS style; v3: substantially expanded, includes
discussion of consistency with observational constraints from gravity; v4:
added discussion of faulty analysis in Sec.III of original paper, matches
published version | Phys. Rev. D 88, 068701 (2013) | 10.1103/PhysRevD.88.068701 | pi-partphys-322 | hep-ph gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The spacetime of Ho and Weiler [Phys. Rev. D {\bf 87}, 045004 (2013)]
supposedly admitting closed timelike curves (CTCs) is flat Minkowski spacetime
with a compactified coordinate and can only contain CTCs if the compact
direction is chosen to be timelike. This case of a "periodic time" is probably
the simplest example of a causality-violating spacetime; it trivially satisfies
all energy conditions usually assumed in general relativity, and its geodesics
are just straight lines. Its relevance for phenomenology of the LHC, on the
other hand, depends on consistency with observational constraints on gravity,
as is mentioned in general but not discussed in any detail by Ho and Weiler. We
verify a basic consistency check for stationary sources.
| [
{
"created": "Thu, 7 Feb 2013 11:11:16 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Mar 2013 19:39:51 GMT",
"version": "v2"
},
{
"created": "Mon, 13 May 2013 17:44:16 GMT",
"version": "v3"
},
{
"created": "Sat, 31 Aug 2013 19:44:23 GMT",
"version": "v4"
}
] | 2013-09-11 | [
[
"Gielen",
"Steffen",
""
]
] | The spacetime of Ho and Weiler [Phys. Rev. D {\bf 87}, 045004 (2013)] supposedly admitting closed timelike curves (CTCs) is flat Minkowski spacetime with a compactified coordinate and can only contain CTCs if the compact direction is chosen to be timelike. This case of a "periodic time" is probably the simplest example of a causality-violating spacetime; it trivially satisfies all energy conditions usually assumed in general relativity, and its geodesics are just straight lines. Its relevance for phenomenology of the LHC, on the other hand, depends on consistency with observational constraints on gravity, as is mentioned in general but not discussed in any detail by Ho and Weiler. We verify a basic consistency check for stationary sources. |
2210.15394 | Adam Bzdak | Micha{\l} Barej, Adam Bzdak | Cumulants from short-range correlations and baryon number conservation -
next-to-leading order | 17 pages, 2 figures | null | 10.1103/PhysRevC.107.034914 | null | hep-ph hep-ex nucl-ex nucl-th | http://creativecommons.org/licenses/by/4.0/ | We calculate the baryon number cumulants within acceptance with short-range
correlations and global baryon number conservation in terms of cumulants in the
whole system without baryon conservation. We extract leading and
next-to-leading order terms of the large baryon number limit approximation. Our
results extend the findings of Refs. [1,2]. These approximations are checked to
be very close to the exact results.
| [
{
"created": "Thu, 27 Oct 2022 12:53:38 GMT",
"version": "v1"
}
] | 2023-03-29 | [
[
"Barej",
"Michał",
""
],
[
"Bzdak",
"Adam",
""
]
] | We calculate the baryon number cumulants within acceptance with short-range correlations and global baryon number conservation in terms of cumulants in the whole system without baryon conservation. We extract leading and next-to-leading order terms of the large baryon number limit approximation. Our results extend the findings of Refs. [1,2]. These approximations are checked to be very close to the exact results. |
hep-ph/9212271 | Juan Carlos Montero | J. C. Montero, F. Pisano and V. Pleitez | Neutral Currents and GIM Mechanism in SU(3)_L X U(1)_N Models for
Electroweak Interactions | 34 pages, REVTeX 2.0 (no figures) | Phys.Rev. D47 (1993) 2918-2929 | 10.1103/PhysRevD.47.2918 | IFT-P.039/92 | hep-ph | null | We study the Glashow-Iliopoulos-Maiani mechanism for
flavor-changing-neutral-currents suppression in both, the gauge and Higgs
sectors, for models with $SU(3)_L\otimes U(1)_N$ gauge symmetry. The models
differ one from the other only with respect to the representation content. The
main features of these models are that in order to cancel the triangle
anomalies the number of families must be divisible by three (the number of
colors) and that the lepton number is violated by some lepton-gauge bosons and
lepton-scalar interactions.
| [
{
"created": "Wed, 16 Dec 1992 16:20:00 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Montero",
"J. C.",
""
],
[
"Pisano",
"F.",
""
],
[
"Pleitez",
"V.",
""
]
] | We study the Glashow-Iliopoulos-Maiani mechanism for flavor-changing-neutral-currents suppression in both, the gauge and Higgs sectors, for models with $SU(3)_L\otimes U(1)_N$ gauge symmetry. The models differ one from the other only with respect to the representation content. The main features of these models are that in order to cancel the triangle anomalies the number of families must be divisible by three (the number of colors) and that the lepton number is violated by some lepton-gauge bosons and lepton-scalar interactions. |
hep-ph/9905290 | Ricardo Gonzalez Felipe | G.C. Branco, D. Emmanuel-Costa and R. Gonzalez Felipe | Yukawa Structure with Maximal Predictability | 13 pages, 2 EPS figures, some modifications and references added;
version to appear in Phys. Lett. B | Phys.Lett. B483 (2000) 87-93 | 10.1016/S0370-2693(00)00531-1 | FISIST/6-99/CFIF | hep-ph | null | A simple Ansatz for the quark mass matrices is considered, based on the
assumption of a power structure for the matrix elements and the requirement of
maximal predictability. A good fit to the present experimental data is obtained
and the position of the vertex of the unitarity triangle, i.e.
(\bar{\rho},\bar{\eta}), is predicted.
| [
{
"created": "Mon, 10 May 1999 19:05:23 GMT",
"version": "v1"
},
{
"created": "Thu, 27 Apr 2000 17:13:13 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Branco",
"G. C.",
""
],
[
"Emmanuel-Costa",
"D.",
""
],
[
"Felipe",
"R. Gonzalez",
""
]
] | A simple Ansatz for the quark mass matrices is considered, based on the assumption of a power structure for the matrix elements and the requirement of maximal predictability. A good fit to the present experimental data is obtained and the position of the vertex of the unitarity triangle, i.e. (\bar{\rho},\bar{\eta}), is predicted. |
1811.12919 | Chi Xiong | Chi Xiong | QCD strings and the U(1) problem | 9 pages, 2 figures. Invited talk given in the 48th ISMD2018 (XL VIII
International Symposium on Multiparticle Dynamics) | null | 10.1051/epjconf/201920602003 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We promote the usual QCD $\theta$-parameter to a field and interpret it as
the phase of the quark condensate, which becomes nontrivial when topological
defects, vortices in our formulation, are induced in the quark condensate by
the QCD strings (chromoelectric flux tubes). The QCD topological term emerges
naturally as a derivative coupling between the Chern-Simons current and a
supercurrent in the quark condensate. This new formulation can address the
$U_A(1)$ problem and leads to the chiral magnetic effects. It is possible that
in this formulation the strong CP problem can be avoided without the axion
particle.
| [
{
"created": "Fri, 30 Nov 2018 18:07:07 GMT",
"version": "v1"
}
] | 2019-05-22 | [
[
"Xiong",
"Chi",
""
]
] | We promote the usual QCD $\theta$-parameter to a field and interpret it as the phase of the quark condensate, which becomes nontrivial when topological defects, vortices in our formulation, are induced in the quark condensate by the QCD strings (chromoelectric flux tubes). The QCD topological term emerges naturally as a derivative coupling between the Chern-Simons current and a supercurrent in the quark condensate. This new formulation can address the $U_A(1)$ problem and leads to the chiral magnetic effects. It is possible that in this formulation the strong CP problem can be avoided without the axion particle. |
hep-ph/0506295 | Amon Ilakovac | Takeshi Fukuyama (1), Amon Ilakovac (2), Tatsuru Kikuchi (1) ((1)
Ritsumeikan U., (2) Zagreb U.) | Lepton Flavour Violating Leptonic/Semileptonic Decays of Charged Leptons
in the Minimal Supersymmetric Standard Model | 36 pages, 3 tables, 5 .eps figures | Eur.Phys.J.C56:125-146,2008 | 10.1140/epjc/s10052-008-0625-3 | null | hep-ph hep-ex | null | We consider the leptonic and semileptonic (SL) lepton flavour violating (LFV)
decays of the charged leptons in the minimal supersymmetric standard model
(MSSM). The formalism for evaluation of branching fractions for the SL LFV
charged-lepton decays with one or two pseudoscalar mesons, or one vector meson
in the final state, is given. Previous amplitudes for the SL LFV charged-lepton
decays in MSSM are improved, for instance the $\gamma$-penguin amplitude is
corrected to assure the gauge invariance. The decays are studied not only in
the model-independent formulation of the theory in the frame of MSSM, but also
within the frame of the minimal supersymmetric SO(10) model within which the
parameters of the MSSM are determined. The latter model gives predictions for
the neutrino-Dirac Yukawa coupling matrix, once free parameters in the model
are appropriately fixed to accommodate the recent neutrino oscillation data.
Using this unambiguous neutrino-Dirac Yukawa couplings, we calculate the LFV
leptonic and SL decay processes assuming the minimal supergravity scenario. A
very detailed numerical analysis is done to constrain the MSSM parameters.
Numerical results for SL LFV processes are given, for instance for tau -> e
(mu) pi0, tau -> e (mu) eta, tau -> e (mu) eta', tau -> e (mu) rho0, tau -> e
(mu) phi, tau -> e (mu) omega, etc.
| [
{
"created": "Tue, 28 Jun 2005 14:08:39 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Fukuyama",
"Takeshi",
""
],
[
"Ilakovac",
"Amon",
""
],
[
"Kikuchi",
"Tatsuru",
""
]
] | We consider the leptonic and semileptonic (SL) lepton flavour violating (LFV) decays of the charged leptons in the minimal supersymmetric standard model (MSSM). The formalism for evaluation of branching fractions for the SL LFV charged-lepton decays with one or two pseudoscalar mesons, or one vector meson in the final state, is given. Previous amplitudes for the SL LFV charged-lepton decays in MSSM are improved, for instance the $\gamma$-penguin amplitude is corrected to assure the gauge invariance. The decays are studied not only in the model-independent formulation of the theory in the frame of MSSM, but also within the frame of the minimal supersymmetric SO(10) model within which the parameters of the MSSM are determined. The latter model gives predictions for the neutrino-Dirac Yukawa coupling matrix, once free parameters in the model are appropriately fixed to accommodate the recent neutrino oscillation data. Using this unambiguous neutrino-Dirac Yukawa couplings, we calculate the LFV leptonic and SL decay processes assuming the minimal supergravity scenario. A very detailed numerical analysis is done to constrain the MSSM parameters. Numerical results for SL LFV processes are given, for instance for tau -> e (mu) pi0, tau -> e (mu) eta, tau -> e (mu) eta', tau -> e (mu) rho0, tau -> e (mu) phi, tau -> e (mu) omega, etc. |
0907.4186 | Tong Li | Pavel Fileviez Perez, Tao Han, Tong Li | Testability of Type I Seesaw at the CERN LHC: Revealing the Existence of
the B-L Symmetry | 40 pages, 27 figures, several modifications made and accepted for
publication in Phys. Rev. D | Phys.Rev.D80:073015,2009 | 10.1103/PhysRevD.80.073015 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the possibility to test the Type I seesaw mechanism for neutrino
masses at the CERN Large Hadron Collider. The inclusion of three generations of
right-handed neutrinos (N_i) provides an attractive option of gauging the B-L
accidental symmetry in the Standard Model (as well as an extended symmetry
X=Y-5(B-L)/4). The production mechanisms for the right-handed neutrinos through
the Z' gauge boson in the U(1)_{B-L} and U(1)_X extensions of the Standard
Model are studied. We discuss the flavor combinations of the charged leptons
from the decays of N_i in the Delta L=2 channels. We find that the clean
channels with dilepton plus jets and possible secondary vertices of the N decay
could provide conclusive signals at the LHC in connection with the hierarchical
pattern of the light neutrino masses and mixing properties within the Type I
seesaw mechanism.
| [
{
"created": "Thu, 23 Jul 2009 22:50:19 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Oct 2009 06:03:47 GMT",
"version": "v2"
}
] | 2009-10-29 | [
[
"Perez",
"Pavel Fileviez",
""
],
[
"Han",
"Tao",
""
],
[
"Li",
"Tong",
""
]
] | We study the possibility to test the Type I seesaw mechanism for neutrino masses at the CERN Large Hadron Collider. The inclusion of three generations of right-handed neutrinos (N_i) provides an attractive option of gauging the B-L accidental symmetry in the Standard Model (as well as an extended symmetry X=Y-5(B-L)/4). The production mechanisms for the right-handed neutrinos through the Z' gauge boson in the U(1)_{B-L} and U(1)_X extensions of the Standard Model are studied. We discuss the flavor combinations of the charged leptons from the decays of N_i in the Delta L=2 channels. We find that the clean channels with dilepton plus jets and possible secondary vertices of the N decay could provide conclusive signals at the LHC in connection with the hierarchical pattern of the light neutrino masses and mixing properties within the Type I seesaw mechanism. |
1409.3196 | Leo Stodolsky | Martin M. Block, Loyal Durand, Francis Halzen, Leo Stodolsky, and
Thomas J. Weiler | Evidence for a Constant `Edge' in Proton-Proton Scattering at Very High
Energies | 8 pages, 2 figures, Sentence added at end of section 2.2, Two typos
corrected | Phys. Rev. D 91, 011501(R) (2015) | 10.1103/PhysRevD.91.011501 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Accurate fits to $pp$ and $\bar pp$ cross section data up to Tevatron
energies, incorporating the constraints imposed by analyticity and unitarity,
successfully predict the results of recent LHC and cosmic ray measurements, and
suggest that the cross sections approach a black disc limit asymptotically. The
approach to the limit is, however, very slow. We present a simple geometric
picture which explains these features in a natural way. A black disc of
logarithmically growing radius is supplemented by a soft `edge' whose
properties are invariant with energy. The constancy of the edge results in the
prediction that the quantity $(\sigma^{TOT}-2\sigma^{El})/\surd\sigma^{TOT}$
approaches a constant at high energy. Using the existing fits, this prediction
appears to be verified. The value of the limiting constant allows an estimate
of the thickness of the edge, which turns out to be on the order of $1\,{\rm
fm}$. One thus arrives at a picture where the proton-proton scattering at lower
energies is dominated by what becomes the edge, while at higher energies it is
dominated by the disc. The crossover between the two regimes is only at $\surd
s\geq $ 10 TeV, accounting for the slow approach to asymptotic behavior. Some
questions as to the nature of the edge are discussed.
| [
{
"created": "Wed, 10 Sep 2014 19:13:22 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Jan 2015 16:09:48 GMT",
"version": "v2"
}
] | 2015-02-04 | [
[
"Block",
"Martin M.",
""
],
[
"Durand",
"Loyal",
""
],
[
"Halzen",
"Francis",
""
],
[
"Stodolsky",
"Leo",
""
],
[
"Weiler",
"Thomas J.",
""
]
] | Accurate fits to $pp$ and $\bar pp$ cross section data up to Tevatron energies, incorporating the constraints imposed by analyticity and unitarity, successfully predict the results of recent LHC and cosmic ray measurements, and suggest that the cross sections approach a black disc limit asymptotically. The approach to the limit is, however, very slow. We present a simple geometric picture which explains these features in a natural way. A black disc of logarithmically growing radius is supplemented by a soft `edge' whose properties are invariant with energy. The constancy of the edge results in the prediction that the quantity $(\sigma^{TOT}-2\sigma^{El})/\surd\sigma^{TOT}$ approaches a constant at high energy. Using the existing fits, this prediction appears to be verified. The value of the limiting constant allows an estimate of the thickness of the edge, which turns out to be on the order of $1\,{\rm fm}$. One thus arrives at a picture where the proton-proton scattering at lower energies is dominated by what becomes the edge, while at higher energies it is dominated by the disc. The crossover between the two regimes is only at $\surd s\geq $ 10 TeV, accounting for the slow approach to asymptotic behavior. Some questions as to the nature of the edge are discussed. |
2003.09283 | Geoff Beck | Geoff Beck | Indirect detection prospects for d$^*$(2380) dark matter | 16 pages, 5 figures | null | 10.1088/1475-7516/2021/02/007 | null | hep-ph astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A Bose-Einstein condensate of the hexaquark particle known as d$^*$(2380) has
been recently proposed as a dark matter candidate by the authors in Bashkanov
\& Watts 2020. This particle can produced in an abundant condensate state in
the early universe and is argued to satisfy all the stability and weak
interaction constraints of a viable dark matter candidate. This dark matter
candidate is able to evade direct detection bounds and is suggested to have the
best observational prospects in the form of indirect astrophysical emissions
due to the decay of the d$^*$ condensate. In this work we test the indirect
observational prospects of this form of dark matter and find that its low mass
$\sim 2$ GeV mean that sub-GeV gamma-rays searches have the best prospects in
the Milky-Way galactic centre where we find $\Gamma_{d^*} < 3.9 \times
10^{-24}$ s$^{-1}$, with current extra-galactic data from M31 and the Coma
cluster producing constraints on the d$^*$ decay rate two orders of magnitude
weaker. In dwarf galaxies we show that the future GAMMA-400 instrument has the
potential to probe down to $\Gamma_{d^*} \sim 10^{-25}$ s$^{-1}$ with 4 years
of exposure time.
| [
{
"created": "Fri, 20 Mar 2020 14:03:44 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Jul 2020 06:56:01 GMT",
"version": "v2"
},
{
"created": "Mon, 16 Nov 2020 10:08:41 GMT",
"version": "v3"
},
{
"created": "Thu, 3 Dec 2020 08:58:13 GMT",
"version": "v4"
},
{
"created": "Mon, 14 Dec 2020 10:48:51 GMT",
"version": "v5"
}
] | 2021-02-17 | [
[
"Beck",
"Geoff",
""
]
] | A Bose-Einstein condensate of the hexaquark particle known as d$^*$(2380) has been recently proposed as a dark matter candidate by the authors in Bashkanov \& Watts 2020. This particle can produced in an abundant condensate state in the early universe and is argued to satisfy all the stability and weak interaction constraints of a viable dark matter candidate. This dark matter candidate is able to evade direct detection bounds and is suggested to have the best observational prospects in the form of indirect astrophysical emissions due to the decay of the d$^*$ condensate. In this work we test the indirect observational prospects of this form of dark matter and find that its low mass $\sim 2$ GeV mean that sub-GeV gamma-rays searches have the best prospects in the Milky-Way galactic centre where we find $\Gamma_{d^*} < 3.9 \times 10^{-24}$ s$^{-1}$, with current extra-galactic data from M31 and the Coma cluster producing constraints on the d$^*$ decay rate two orders of magnitude weaker. In dwarf galaxies we show that the future GAMMA-400 instrument has the potential to probe down to $\Gamma_{d^*} \sim 10^{-25}$ s$^{-1}$ with 4 years of exposure time. |
2406.11673 | Eugene Levin | Carlos Contreras (UTFSM), Jose Garrido (UTFSM), Eugene Levin (Tel Aviv
U.) and Rodrigo Meneses (U. de Valparaiso) | Modified homotopy approach for diffractive production in the saturation
region | 22 pages, 16 figures in pdf files | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | In this paper we continue to develop the homotopy method for solving of the
non linear evolution equation for the diffractive production in deep inelastic
scattering(DIS). We introduce part of the nonlinear corrections as a first step
of this approach. This simplified nonlinear evolution equation is solved
analytically taking into account the initial and boundary conditions for the
process. At the second step of our approach we demonstrated that the
perturbative procedure can be used for the remaining parts of the non-linear
corrections. It turns out that these corrections are small and can be estimated
in the regular iterative procedure.
| [
{
"created": "Mon, 17 Jun 2024 15:52:39 GMT",
"version": "v1"
}
] | 2024-06-18 | [
[
"Contreras",
"Carlos",
"",
"UTFSM"
],
[
"Garrido",
"Jose",
"",
"UTFSM"
],
[
"Levin",
"Eugene",
"",
"Tel Aviv\n U."
],
[
"Meneses",
"Rodrigo",
"",
"U. de Valparaiso"
]
] | In this paper we continue to develop the homotopy method for solving of the non linear evolution equation for the diffractive production in deep inelastic scattering(DIS). We introduce part of the nonlinear corrections as a first step of this approach. This simplified nonlinear evolution equation is solved analytically taking into account the initial and boundary conditions for the process. At the second step of our approach we demonstrated that the perturbative procedure can be used for the remaining parts of the non-linear corrections. It turns out that these corrections are small and can be estimated in the regular iterative procedure. |
hep-ph/0208017 | Engin Ateser | O. Cakir, E. Ateser, H. Koru | Scalar leptoquark production at TESLA and CLIC based e-gamma colliders | Misprints in equations are corrected. A careful spell check has been
done.17 pages, 8 figures | Eur.Phys.J.C28:381-388,2003 | 10.1140/epjc/s2003-01182-8 | null | hep-ph | null | We study scalar leptoquark production at TESLA and CLIC based e-gamma
colliders. Both direct and resolved contributions to the cross section are
examined. We find that the masses of scalar leptoquarks can be probed up to
about 0.9 TeV at TESLA and 2.6 TeV at CLIC.
| [
{
"created": "Thu, 1 Aug 2002 21:13:25 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Aug 2002 09:20:57 GMT",
"version": "v2"
},
{
"created": "Mon, 9 Dec 2002 17:07:57 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Cakir",
"O.",
""
],
[
"Ateser",
"E.",
""
],
[
"Koru",
"H.",
""
]
] | We study scalar leptoquark production at TESLA and CLIC based e-gamma colliders. Both direct and resolved contributions to the cross section are examined. We find that the masses of scalar leptoquarks can be probed up to about 0.9 TeV at TESLA and 2.6 TeV at CLIC. |
1406.5897 | Krzysztof Marek Kutak | Krzysztof Kutak | Non-linear evolution equation for gluon density at large values of
coupling constant | 6 pages, contribution to DIS 2014, Warszawa, Poland | null | null | IFJPAN-IV-2014-12 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The recently proposed nonlinear evolution equation \cite{Kutak:2013hda} for
unintegrated gluon densities valid for large values of the QCD coupling
constant $\bar{\alpha} _s$ is presented. In particular we outline its
derivation, numerical solution and obtained saturation scale.
| [
{
"created": "Mon, 23 Jun 2014 13:26:19 GMT",
"version": "v1"
}
] | 2014-06-24 | [
[
"Kutak",
"Krzysztof",
""
]
] | The recently proposed nonlinear evolution equation \cite{Kutak:2013hda} for unintegrated gluon densities valid for large values of the QCD coupling constant $\bar{\alpha} _s$ is presented. In particular we outline its derivation, numerical solution and obtained saturation scale. |
2202.05882 | Juan Rocamonde | Juan Rocamonde, Louie Corpe, Gustavs Zilgalvis, Maria Avramidou and
Jon Butterworth | Picking the low-hanging fruit: testing new physics at scale with active
learning | null | SciPost Phys. 13, 002 (2022) | 10.21468/SciPostPhys.13.1.002 | MCnet-21 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Since the discovery of the Higgs boson, testing the many possible extensions
to the Standard Model has become a key challenge in particle physics. This
paper discusses a new method for predicting the compatibility of new physics
theories with existing experimental data from particle colliders. Using machine
learning, the technique obtained comparable results to previous methods (>90%
precision and recall) with only a fraction of their computing resources (<10%).
This makes it possible to test models that were impossible to probe before, and
allows for large-scale testing of new physics theories.
| [
{
"created": "Fri, 11 Feb 2022 19:52:00 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Apr 2022 14:32:24 GMT",
"version": "v2"
}
] | 2022-07-20 | [
[
"Rocamonde",
"Juan",
""
],
[
"Corpe",
"Louie",
""
],
[
"Zilgalvis",
"Gustavs",
""
],
[
"Avramidou",
"Maria",
""
],
[
"Butterworth",
"Jon",
""
]
] | Since the discovery of the Higgs boson, testing the many possible extensions to the Standard Model has become a key challenge in particle physics. This paper discusses a new method for predicting the compatibility of new physics theories with existing experimental data from particle colliders. Using machine learning, the technique obtained comparable results to previous methods (>90% precision and recall) with only a fraction of their computing resources (<10%). This makes it possible to test models that were impossible to probe before, and allows for large-scale testing of new physics theories. |
hep-ph/9701329 | Alexander L. Bondarev | Alexander L. Bondarev (NC PHEP, Minsk, Belarus) | A New Identity in Minkowski Space and Some Applications of It | 6 pages, LaTeX | Theor.Math.Phys. 101 (1994) 1376-1379; Teor.Mat.Fiz. 101 (1994)
315-319 | null | null | hep-ph | null | Schouten's identity is used to obtain a new identity in Minkowski space. Some
applications of the new identity in high-energy physics are considered,
including the possibility of significant shortening of the expressions for the
traces of products of ten and more Dirac gamma-matrices.
| [
{
"created": "Mon, 20 Jan 1997 22:20:53 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Bondarev",
"Alexander L.",
"",
"NC PHEP, Minsk, Belarus"
]
] | Schouten's identity is used to obtain a new identity in Minkowski space. Some applications of the new identity in high-energy physics are considered, including the possibility of significant shortening of the expressions for the traces of products of ten and more Dirac gamma-matrices. |
hep-ph/0202020 | Fjy | F. J. Yndurain | Basic Parameters and Some Precision Tests of the Standard Model | Plain TeX file. 6figures | Nucl.Phys.Proc.Suppl.114:95-106,2003 | 10.1016/S0920-5632(02)01896-0 | FTUAM 02-1 | hep-ph | null | We present a review of the masses (except for neutrino masses) and
interaction strengths in the standard model. Special emphasis is put on
quantities that have been determined with significantly improved precision in
the last few years. In particular, a number of determinations of $\alpha_s$ and
the electromagnetic coupling on the $Z$, $\alpha_{\rm QED}(M_Z^2)$ are
presented and their implications for the Higgs mass discussed; the best
prediction that results for this last quantity being $$M_H=102^{+54}_{-36}
GeV/c^2.$$ Besides this, we also discuss a few extra precision tests of the
standard model: the electron magnetic moment and dipole moment, and the muon
magnetic moment.
| [
{
"created": "Mon, 4 Feb 2002 11:25:44 GMT",
"version": "v1"
}
] | 2011-07-19 | [
[
"Yndurain",
"F. J.",
""
]
] | We present a review of the masses (except for neutrino masses) and interaction strengths in the standard model. Special emphasis is put on quantities that have been determined with significantly improved precision in the last few years. In particular, a number of determinations of $\alpha_s$ and the electromagnetic coupling on the $Z$, $\alpha_{\rm QED}(M_Z^2)$ are presented and their implications for the Higgs mass discussed; the best prediction that results for this last quantity being $$M_H=102^{+54}_{-36} GeV/c^2.$$ Besides this, we also discuss a few extra precision tests of the standard model: the electron magnetic moment and dipole moment, and the muon magnetic moment. |
1309.7075 | Magno Machado | M.V.T. Machado, C. Brenner Mariotto | Looking at the photoproduction of massive gauge bosons at the LHeC | Contribution to the proceedings of the XXI International Workshop on
Deep-Inelastic Scattering and Related Subjects (DIS2013), Marseille, 22-26
April 2013 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this contribution we report on the investigation of the photoproduction of
W and Z bosons in the planned electron-proton/nucleus collider, the LHeC. The
production cross sections and the number of events are provided and theoretical
uncertainties are discussed. We also analyze the sensitivity of the LHeC
experiment to physics beyond Standard Model by studying the role played by
anomalous WWgamma coupling in the presented process.
| [
{
"created": "Thu, 26 Sep 2013 21:09:40 GMT",
"version": "v1"
}
] | 2013-09-30 | [
[
"Machado",
"M. V. T.",
""
],
[
"Mariotto",
"C. Brenner",
""
]
] | In this contribution we report on the investigation of the photoproduction of W and Z bosons in the planned electron-proton/nucleus collider, the LHeC. The production cross sections and the number of events are provided and theoretical uncertainties are discussed. We also analyze the sensitivity of the LHeC experiment to physics beyond Standard Model by studying the role played by anomalous WWgamma coupling in the presented process. |
1910.00090 | Howard Baer | Howard Baer, Vernon Barger and Dibyashree Sengupta | A landscape solution to the SUSY flavor and CP problems | 18 pages with 8 .png figures | Phys. Rev. Research 1, 033179 (2019) | 10.1103/PhysRevResearch.1.033179 | OU-HEP-190930 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a fertile patch of the string landscape which includes the Minimal
Supersymmetric Standard Model (MSSM) as the low energy effective theory, rather
general arguments from Douglas suggest a power-law statistical selection of
soft breaking terms (m(soft)^n where n=2n_F+n_D-1 with n_F the number of hidden
sector F-SUSY breaking fields and n_D the number of D-term SUSY breaking
fields). The statistical draw towards large soft terms must be tempered by
requiring an appropriate breakdown of electroweak (EW) symmetry with no
contributions to the weak scale larger than a factor 2-5 of its measured value,
lest one violates the (anthropic) atomic principle. Such a simple picture of
stringy naturalness generates a light Higgs boson with mass m_h~ 125 GeV with
sparticles (other than higgsinos) typically beyond LHC reach. Then we expect
first and second generation matter scalars to be drawn independently to the
tens of TeV regime where the upper cutoff arises from two-loop RGE terms which
drive third generation soft masses towards tachyonic values. Since the upper
bounds on m_0(1,2) are the same for each generation, and flavor independent,
then these will be drawn toward quasi-degenerate values. This mechanism leads
to a natural mixed decoupling/quasi-degeneracy solution to the SUSY flavor
problem and a decoupling solution to the SUSY CP problem.
| [
{
"created": "Mon, 30 Sep 2019 20:36:08 GMT",
"version": "v1"
}
] | 2019-12-25 | [
[
"Baer",
"Howard",
""
],
[
"Barger",
"Vernon",
""
],
[
"Sengupta",
"Dibyashree",
""
]
] | In a fertile patch of the string landscape which includes the Minimal Supersymmetric Standard Model (MSSM) as the low energy effective theory, rather general arguments from Douglas suggest a power-law statistical selection of soft breaking terms (m(soft)^n where n=2n_F+n_D-1 with n_F the number of hidden sector F-SUSY breaking fields and n_D the number of D-term SUSY breaking fields). The statistical draw towards large soft terms must be tempered by requiring an appropriate breakdown of electroweak (EW) symmetry with no contributions to the weak scale larger than a factor 2-5 of its measured value, lest one violates the (anthropic) atomic principle. Such a simple picture of stringy naturalness generates a light Higgs boson with mass m_h~ 125 GeV with sparticles (other than higgsinos) typically beyond LHC reach. Then we expect first and second generation matter scalars to be drawn independently to the tens of TeV regime where the upper cutoff arises from two-loop RGE terms which drive third generation soft masses towards tachyonic values. Since the upper bounds on m_0(1,2) are the same for each generation, and flavor independent, then these will be drawn toward quasi-degenerate values. This mechanism leads to a natural mixed decoupling/quasi-degeneracy solution to the SUSY flavor problem and a decoupling solution to the SUSY CP problem. |
0904.2184 | Charles Gale | Charles Gale | Photon Production in Hot and Dense Strongly Interacting Matter | 35 pages, accepted for publication, Landolt-Boernstein Volume 1-23A | null | 10.1007/978-3-642-01539-7_15 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This text is meant as an introduction to the theoretical physics of photon
emission in hot and dense strongly interacting matter, the principal
application being relativistic nuclear collisions. We shall cover some of the
results and techniques appropriate for studies at SPS, RHIC, and LHC energies
| [
{
"created": "Tue, 14 Apr 2009 20:10:05 GMT",
"version": "v1"
}
] | 2015-05-13 | [
[
"Gale",
"Charles",
""
]
] | This text is meant as an introduction to the theoretical physics of photon emission in hot and dense strongly interacting matter, the principal application being relativistic nuclear collisions. We shall cover some of the results and techniques appropriate for studies at SPS, RHIC, and LHC energies |
0811.3737 | Boris Blok | B. Blok (Technion, Haifa), L. Frankfurt (Tel Aviv University, Tel
Aviv), M. Strikman (Pensilvania State University, University Park) | On the shape of a rapid hadron in QCD | 14 pages, 2 figures, uses epstopdf.sty typos corrected | Phys.Lett.B679:122-129,2009 | 10.1016/j.physletb.2009.07.015 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We visualize the fundamental property of pQCD: the smaller size of the
colorless quark-gluon configurations leads to a more rapid increase of its
interaction with energy. Within the frame of dipole model we use the $k_t$
factorization theorem to generalize the DGLAP approximation and/or leading
$\ln(x_0/x)$ approximation and evaluate the interaction of quark dipole with a
target. In the limit of fixed $Q^2$ and $x\to 0$ we found the increase with
energy of transverse momenta of quark(antiquark) within q$\bar q$ pair produced
by strongly virtual photon. The average $p^2_t$ is evaluated analytically
within the double logarithmic approximation. We demonstrate that the invariant
mass$^2$ of the q$\bar q$ pair increases with the energy as
$M^2_0(x_0/x)^{\lambda}$, where $\lambda\sim 0.4\alpha_sN_c/\pi$ for transverse
photons, and as $\sim M^2_0 \exp{0.17[(4\alpha_sN_c/\pi)\log(x_0/x)]^{1/2}}$
for longitudinal photons, where $M^2_0 \approx 0.7Q^2$ at the energies of the
order $s_0\sim 10^4$ GeV$^2$ ($x_0\sim 10^{-2}$). The magnitude of the effect
depends strongly on the small $x$ behavior of the gluon distribution. Similar
pattern of the energy dependence of $M^2$ is found in the LO DGLAP
approximation generalized to account for $k_t$ factorization. We discuss the
impact of the found phenomenon on the dependence of the coherence length on the
initial energy and demonstrate that the shape of final hadron state in DIS has
biconcave form instead of pancake. Some implications of the found phenomena for
the hard processes in pp collisions are discussed.
| [
{
"created": "Sun, 23 Nov 2008 11:26:04 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Dec 2008 10:24:17 GMT",
"version": "v2"
}
] | 2009-08-17 | [
[
"Blok",
"B.",
"",
"Technion, Haifa"
],
[
"Frankfurt",
"L.",
"",
"Tel Aviv University, Tel\n Aviv"
],
[
"Strikman",
"M.",
"",
"Pensilvania State University, University Park"
]
] | We visualize the fundamental property of pQCD: the smaller size of the colorless quark-gluon configurations leads to a more rapid increase of its interaction with energy. Within the frame of dipole model we use the $k_t$ factorization theorem to generalize the DGLAP approximation and/or leading $\ln(x_0/x)$ approximation and evaluate the interaction of quark dipole with a target. In the limit of fixed $Q^2$ and $x\to 0$ we found the increase with energy of transverse momenta of quark(antiquark) within q$\bar q$ pair produced by strongly virtual photon. The average $p^2_t$ is evaluated analytically within the double logarithmic approximation. We demonstrate that the invariant mass$^2$ of the q$\bar q$ pair increases with the energy as $M^2_0(x_0/x)^{\lambda}$, where $\lambda\sim 0.4\alpha_sN_c/\pi$ for transverse photons, and as $\sim M^2_0 \exp{0.17[(4\alpha_sN_c/\pi)\log(x_0/x)]^{1/2}}$ for longitudinal photons, where $M^2_0 \approx 0.7Q^2$ at the energies of the order $s_0\sim 10^4$ GeV$^2$ ($x_0\sim 10^{-2}$). The magnitude of the effect depends strongly on the small $x$ behavior of the gluon distribution. Similar pattern of the energy dependence of $M^2$ is found in the LO DGLAP approximation generalized to account for $k_t$ factorization. We discuss the impact of the found phenomenon on the dependence of the coherence length on the initial energy and demonstrate that the shape of final hadron state in DIS has biconcave form instead of pancake. Some implications of the found phenomena for the hard processes in pp collisions are discussed. |
2102.12539 | Luca Buonocore | Luca Buonocore, Massimiliano Grazzini, Stefan Kallweit, Chiara Savoini
and Francesco Tramontano | Mixed QCD-EW corrections to $\boldsymbol{pp\!\to\!\ell\nu_\ell\!+\!X}$
at the LHC | 18 pages, 4 figures, 1 table, v2: extended version of the manuscript
that has been accepted for publication by PRD (one extra figure on systematic
uncertainties, updated table of cross sections) | Phys. Rev. D 103, 114012 (2021) | 10.1103/PhysRevD.103.114012 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the hadroproduction of a massive charged lepton plus the
corresponding neutrino through the Drell-Yan mechanism. We present a new
computation of the mixed QCD-EW corrections to this process. The cancellation
of soft and collinear singularities is achieved by using a formulation of the
$q_T$ subtraction formalism derived from the next-to-next-to-leading order QCD
calculation for heavy-quark production. For the first time, all the real and
virtual contributions due to initial- and final-state radiation are
consistently included without any approximation, except for the finite part of
the two-loop virtual correction, which is computed in the pole approximation
and suitably improved through a reweighting procedure. We demonstrate that our
calculation is reliable in both on-shell and off-shell regions, thereby
providing the first prediction of the mixed QCD-EW corrections in the entire
region of the lepton transverse momentum. The computed corrections are in
qualitative agreement with what we obtain in a factorised approach of QCD and
EW corrections. At large values of the lepton $p_T$, the mixed QCD-EW
corrections are negative and increase in size, to about $-20\%$ with respect to
the next-to-leading order QCD result at $p_T=500\,$GeV.
| [
{
"created": "Wed, 24 Feb 2021 20:14:20 GMT",
"version": "v1"
},
{
"created": "Tue, 18 May 2021 16:44:16 GMT",
"version": "v2"
}
] | 2021-06-16 | [
[
"Buonocore",
"Luca",
""
],
[
"Grazzini",
"Massimiliano",
""
],
[
"Kallweit",
"Stefan",
""
],
[
"Savoini",
"Chiara",
""
],
[
"Tramontano",
"Francesco",
""
]
] | We consider the hadroproduction of a massive charged lepton plus the corresponding neutrino through the Drell-Yan mechanism. We present a new computation of the mixed QCD-EW corrections to this process. The cancellation of soft and collinear singularities is achieved by using a formulation of the $q_T$ subtraction formalism derived from the next-to-next-to-leading order QCD calculation for heavy-quark production. For the first time, all the real and virtual contributions due to initial- and final-state radiation are consistently included without any approximation, except for the finite part of the two-loop virtual correction, which is computed in the pole approximation and suitably improved through a reweighting procedure. We demonstrate that our calculation is reliable in both on-shell and off-shell regions, thereby providing the first prediction of the mixed QCD-EW corrections in the entire region of the lepton transverse momentum. The computed corrections are in qualitative agreement with what we obtain in a factorised approach of QCD and EW corrections. At large values of the lepton $p_T$, the mixed QCD-EW corrections are negative and increase in size, to about $-20\%$ with respect to the next-to-leading order QCD result at $p_T=500\,$GeV. |
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