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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2108.10186
|
Sergei Roshchupkin P
|
S. P. Roshchupkin, A.V. Dubov, V. V. Dubov, S. S. Starodub
|
Resonant Spontaneous Bremsstrahlung Effect In The Scattering Of
Ultrarelativistic Electrons On Nuclei In A Strong Laser Field
|
26 pages, 35 figures
| null |
10.1088/1742-6596/2249/1/012003
| null |
hep-ph physics.plasm-ph
|
http://creativecommons.org/licenses/by/4.0/
|
The process of resonant spontaneous bremsstrahlung radiation during the
scattering of ultrarelativistic electrons with energies of the order $\sim 100\
\text{GeV}$ by the nuclei in strong laser fields with intensities up to $I\sim
{{10}^{24}}\ \text{Wc}{{\text{m}}^{\text{-2}}}$ is theoretically studied. Under
resonant conditions, an intermediate electron in the wave field enters the mass
shell. As a result, the initial second-order process by the fine structure
constant is effectively reduced to two first-order processes: laser-stimulated
Compton effect and laser-assisted Mott process. The resonant kinematics for two
reaction channels (A and B) is studied in detail. It is shown that in the
resonant case there is a characteristic parameter that determines a significant
number of absorbed laser photons in the laser-stimulated Compton effect. This
parameter is determined by the parameters of the laser installation, the energy
of the initial electrons and is proportional to the intensity of the laser
wave. An analytical resonant differential cross-section with simultaneous
registration of the frequency and the outgoing angle of a spontaneous
gamma-quantum is obtained. It is shown that the resonant differential
cross-section has the largest value in the region of average laser fields
($I\sim {{10}^{18}}\ \text{Wc}{{\text{m}}^{\text{-2}}}$) and can be of the
order of $\sim {{10}^{18}}$ in units ${{Z}^{2}}\alpha r_{e}^{2}$. With an
increase in the intensity of the laser wave, the value of the resonant
differential cross-section decreases and for the intensity $I\sim {{10}^{24}}\
\text{Wc}{{\text{m}}^{\text{-2}}}$ is of the order of $\sim {{10}^{4}}$ in
units ${{Z}^{2}}\alpha r_{e}^{2}$. The obtained results reveal new features of
spontaneous emission of ultrarelativistic electrons on nuclei in strong laser
fields and can be tested at international laser installations.
|
[
{
"created": "Fri, 20 Aug 2021 09:35:20 GMT",
"version": "v1"
}
] |
2022-05-18
|
[
[
"Roshchupkin",
"S. P.",
""
],
[
"Dubov",
"A. V.",
""
],
[
"Dubov",
"V. V.",
""
],
[
"Starodub",
"S. S.",
""
]
] |
The process of resonant spontaneous bremsstrahlung radiation during the scattering of ultrarelativistic electrons with energies of the order $\sim 100\ \text{GeV}$ by the nuclei in strong laser fields with intensities up to $I\sim {{10}^{24}}\ \text{Wc}{{\text{m}}^{\text{-2}}}$ is theoretically studied. Under resonant conditions, an intermediate electron in the wave field enters the mass shell. As a result, the initial second-order process by the fine structure constant is effectively reduced to two first-order processes: laser-stimulated Compton effect and laser-assisted Mott process. The resonant kinematics for two reaction channels (A and B) is studied in detail. It is shown that in the resonant case there is a characteristic parameter that determines a significant number of absorbed laser photons in the laser-stimulated Compton effect. This parameter is determined by the parameters of the laser installation, the energy of the initial electrons and is proportional to the intensity of the laser wave. An analytical resonant differential cross-section with simultaneous registration of the frequency and the outgoing angle of a spontaneous gamma-quantum is obtained. It is shown that the resonant differential cross-section has the largest value in the region of average laser fields ($I\sim {{10}^{18}}\ \text{Wc}{{\text{m}}^{\text{-2}}}$) and can be of the order of $\sim {{10}^{18}}$ in units ${{Z}^{2}}\alpha r_{e}^{2}$. With an increase in the intensity of the laser wave, the value of the resonant differential cross-section decreases and for the intensity $I\sim {{10}^{24}}\ \text{Wc}{{\text{m}}^{\text{-2}}}$ is of the order of $\sim {{10}^{4}}$ in units ${{Z}^{2}}\alpha r_{e}^{2}$. The obtained results reveal new features of spontaneous emission of ultrarelativistic electrons on nuclei in strong laser fields and can be tested at international laser installations.
|
2111.02729
|
Jianlong Lu
|
Jianlong Lu
|
(Reply to)$^{\textbf{2}}$ "Comment on 'Flavor invariants and
renormalization-group equations in the leptonic sector with massive Majorana
neutrinos' "
|
12 pages; a reply to [arXiv:2110.13865 [hep-ph]]; some details of
expression have been improved in version 2. arXiv admin note: text overlap
with arXiv:2110.08210
| null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We respectfully reply to Wang et al.'s reply to our comment to their [JHEP
$\textbf{09}$ (2021) 053]. Some more subtleties and details are discussed for
hopefully better clarification and understanding, especially about the
conditions in Hilbert's finiteness theorem. We also disprove Wang et al.'s
incorrect assertion in their reply [arXiv:2110.13865 [hep-ph]] that there is an
isomorphism between ${\rm U}(n,\mathbb{C})$ and ${\rm GL}(n,\mathbb{C})$. We
give two proofs for our argument. One proof is in the context of Lie group for
arbitrary positive integer $n$, and the other proof is in the context of
abstract group for $n=3$ which can also be generalized to $n\geq 3$. In order
to better illustrate the intrinsic differences between a compact Lie group and
its complexification, we choose ${\rm SU}(n,\mathbb{C})$ and ${\rm
SL}(n,\mathbb{C})$ as a pair of examples and give two proofs for the generally
non-isomorphic relation between them. One proof is in the context of Lie group
for integers $n\geq 2$, and the other proof is in the context of abstract group
for $n=3$ which can again be generalized to $n\geq 3$.
|
[
{
"created": "Thu, 4 Nov 2021 10:32:40 GMT",
"version": "v1"
},
{
"created": "Sun, 7 Nov 2021 15:53:18 GMT",
"version": "v2"
}
] |
2022-02-08
|
[
[
"Lu",
"Jianlong",
""
]
] |
We respectfully reply to Wang et al.'s reply to our comment to their [JHEP $\textbf{09}$ (2021) 053]. Some more subtleties and details are discussed for hopefully better clarification and understanding, especially about the conditions in Hilbert's finiteness theorem. We also disprove Wang et al.'s incorrect assertion in their reply [arXiv:2110.13865 [hep-ph]] that there is an isomorphism between ${\rm U}(n,\mathbb{C})$ and ${\rm GL}(n,\mathbb{C})$. We give two proofs for our argument. One proof is in the context of Lie group for arbitrary positive integer $n$, and the other proof is in the context of abstract group for $n=3$ which can also be generalized to $n\geq 3$. In order to better illustrate the intrinsic differences between a compact Lie group and its complexification, we choose ${\rm SU}(n,\mathbb{C})$ and ${\rm SL}(n,\mathbb{C})$ as a pair of examples and give two proofs for the generally non-isomorphic relation between them. One proof is in the context of Lie group for integers $n\geq 2$, and the other proof is in the context of abstract group for $n=3$ which can again be generalized to $n\geq 3$.
|
2002.06123
|
Soroush Shakeri
|
Soroush Shakeri, David J. E. Marsh and She-Sheng Xue
|
Light by Light Scattering as a New Probe for Axions
|
13 pages, 3 figures
| null | null | null |
hep-ph astro-ph.CO astro-ph.IM hep-ex physics.optics
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the impact of virtual axions on the polarization of photons inside a
cavity during the interaction of high-power laser pulses. A novel detection
scheme for measuring the axion-induced ellipticity signal during the
Light-by-Light (LBL) scattering process is investigated. We show that a
momentum exchange between photons in a probe laser beam and a high-intensity
target beam may lead to a resonance at the physical mass of the axion.
Consequently, the resonant enhancement of vacuum birefringence gives rise to a
large ellipticity signal. This signal enhancement can be applied in order to
discriminate between the axion contribution to LBL scattering and the standard
model contribution due to electron-positron pairs. The sensitivity of the
scheme is studied for experimentally feasible probe light sources and ultrahigh
intensity laser backgrounds. It is shown that this technique has the potential
to probe the QCD axion in the mass range $10^{-2} \textrm{eV} \lesssim m_{a}
\lesssim 1 \textrm{eV}$. In this region the axion induced signal surpasses the
standard model background.
|
[
{
"created": "Fri, 14 Feb 2020 16:50:53 GMT",
"version": "v1"
}
] |
2020-02-17
|
[
[
"Shakeri",
"Soroush",
""
],
[
"Marsh",
"David J. E.",
""
],
[
"Xue",
"She-Sheng",
""
]
] |
We study the impact of virtual axions on the polarization of photons inside a cavity during the interaction of high-power laser pulses. A novel detection scheme for measuring the axion-induced ellipticity signal during the Light-by-Light (LBL) scattering process is investigated. We show that a momentum exchange between photons in a probe laser beam and a high-intensity target beam may lead to a resonance at the physical mass of the axion. Consequently, the resonant enhancement of vacuum birefringence gives rise to a large ellipticity signal. This signal enhancement can be applied in order to discriminate between the axion contribution to LBL scattering and the standard model contribution due to electron-positron pairs. The sensitivity of the scheme is studied for experimentally feasible probe light sources and ultrahigh intensity laser backgrounds. It is shown that this technique has the potential to probe the QCD axion in the mass range $10^{-2} \textrm{eV} \lesssim m_{a} \lesssim 1 \textrm{eV}$. In this region the axion induced signal surpasses the standard model background.
|
2402.04600
|
Yu-Qi Xiao
|
Shao-Long Chen, Yu-Qi Xiao
|
Neutrinoless Double Beta Decay in Multiple Isotopes for Fingerprints
Identification of Operators and Models
|
29 pages, 16 figures. (discussions and descriptions added)
| null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
Neutrinoless double beta ($0\nu\beta\beta$) decay is the most promising way
to determine whether neutrinos are Majorana particles. There are many
experiments based on different isotopes searching for $0\nu\beta\beta$ decay.
Combining the searches of $0\nu\beta\beta$ decay in multiple isotopes provides
a possible method to distinguish operators and different models. The
contributions to $0\nu\beta\beta$ decay come from standard, long-range, and
short-range mechanisms. We analyze the scenario in which the standard and
short-range operators exist simultaneously within the framework of low-energy
effective field theory. Five specific models are considered, which can realize
neutrino mass and can contribute to $0\nu\beta\beta$ decay via multiple
mechanisms. A criterion to evaluate the possibilities of future experiments to
discriminate operators and models is built. We find that the complementary
searches for $0\nu\beta\beta$ decay in different isotopes can distinguish the
cases that contain the low-energy effective operators $\mathcal{O}_{1,2,5}$ and
R-parity violating supersymmetry model. For other cases and models, the
experimental searches within multiple isotopes can also more effectively
constrain the parameter region than with only one isotope.
|
[
{
"created": "Wed, 7 Feb 2024 05:48:53 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Feb 2024 04:36:37 GMT",
"version": "v2"
},
{
"created": "Wed, 17 Apr 2024 02:48:44 GMT",
"version": "v3"
}
] |
2024-04-18
|
[
[
"Chen",
"Shao-Long",
""
],
[
"Xiao",
"Yu-Qi",
""
]
] |
Neutrinoless double beta ($0\nu\beta\beta$) decay is the most promising way to determine whether neutrinos are Majorana particles. There are many experiments based on different isotopes searching for $0\nu\beta\beta$ decay. Combining the searches of $0\nu\beta\beta$ decay in multiple isotopes provides a possible method to distinguish operators and different models. The contributions to $0\nu\beta\beta$ decay come from standard, long-range, and short-range mechanisms. We analyze the scenario in which the standard and short-range operators exist simultaneously within the framework of low-energy effective field theory. Five specific models are considered, which can realize neutrino mass and can contribute to $0\nu\beta\beta$ decay via multiple mechanisms. A criterion to evaluate the possibilities of future experiments to discriminate operators and models is built. We find that the complementary searches for $0\nu\beta\beta$ decay in different isotopes can distinguish the cases that contain the low-energy effective operators $\mathcal{O}_{1,2,5}$ and R-parity violating supersymmetry model. For other cases and models, the experimental searches within multiple isotopes can also more effectively constrain the parameter region than with only one isotope.
|
2203.13180
|
Thomas Biek\"otter
|
Thomas Biek\"otter, Sven Heinemeyer, Georg Weiglein
|
Mounting evidence for a 95 GeV Higgs boson
|
v2: 24 pages, 9 figures, matches published version
|
J. High Energ. Phys. 2022, 201 (2022)
|
10.1007/JHEP08(2022)201
|
DESY 22-057, IFT-UAM/CSIC--22--033
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In 2018 CMS reported an excess in the light Higgs-boson search in the
diphoton decay mode at about 95GeV based on Run 1 and first year Run 2 data.
The combined local significance of the excess was $2.8\,\sigma$. The excess is
compatible with the limits obtained in the ATLAS searches from the diphoton
search channel. Recently, CMS reported another local excess with a significance
of $3.1\,\sigma$ in the light Higgs-boson search in the di-tau final state,
which is compatible with the interpretation of a Higgs boson with a mass of
about 95GeV. We show that the observed results can be interpreted as
manifestations of a Higgs boson in the Two-Higgs Doublet Model with an
additional real singlet (N2HDM). We find that the lightest Higgs boson of the
N2HDM can fit both excesses simultaneously, while the second-lightest state is
such that it satisfies the Higgs-boson measurements at 125GeV, and the full
Higgs-boson sector is compatible with all Higgs exclusion bounds from the
searches at LEP, the Tevatron and the LHC as well as with other theoretical and
experimental constraints. Finally, we demonstrate that it is furthermore
possible to accommodate the excesses observed by CMS in the two search channels
together with a local $2.3\,\sigma$ excess in the $b \bar b$ final state
observed at LEP in the same mass range.
|
[
{
"created": "Thu, 24 Mar 2022 16:55:44 GMT",
"version": "v1"
},
{
"created": "Sun, 21 Aug 2022 10:48:22 GMT",
"version": "v2"
}
] |
2022-08-23
|
[
[
"Biekötter",
"Thomas",
""
],
[
"Heinemeyer",
"Sven",
""
],
[
"Weiglein",
"Georg",
""
]
] |
In 2018 CMS reported an excess in the light Higgs-boson search in the diphoton decay mode at about 95GeV based on Run 1 and first year Run 2 data. The combined local significance of the excess was $2.8\,\sigma$. The excess is compatible with the limits obtained in the ATLAS searches from the diphoton search channel. Recently, CMS reported another local excess with a significance of $3.1\,\sigma$ in the light Higgs-boson search in the di-tau final state, which is compatible with the interpretation of a Higgs boson with a mass of about 95GeV. We show that the observed results can be interpreted as manifestations of a Higgs boson in the Two-Higgs Doublet Model with an additional real singlet (N2HDM). We find that the lightest Higgs boson of the N2HDM can fit both excesses simultaneously, while the second-lightest state is such that it satisfies the Higgs-boson measurements at 125GeV, and the full Higgs-boson sector is compatible with all Higgs exclusion bounds from the searches at LEP, the Tevatron and the LHC as well as with other theoretical and experimental constraints. Finally, we demonstrate that it is furthermore possible to accommodate the excesses observed by CMS in the two search channels together with a local $2.3\,\sigma$ excess in the $b \bar b$ final state observed at LEP in the same mass range.
|
hep-ph/9402310
|
Chi-Keung Chow
|
Chi-Keung Chow and Mark B. Wise
|
Excited $\Lambda_Q$ Baryons in the Large $N_c$ Limit
|
9 pages, use phyzzx, CALT-68-1919
|
Phys.Rev. D50 (1994) 2135-2138
|
10.1103/PhysRevD.50.2135
| null |
hep-ph
| null |
The spectrum of excited $\Lambda_Q$-type heavy baryons is considered in the
large $N_c$ limit. The universal form factors for $\Lambda_b$ semileptonic
decay to excited charmed baryons are calculated in the large $N_c$ limit. We
find that the Bjorken sum rule (for the slope of the Isgur--Wise function) and
Voloshin sum rule (for the mass of the light degrees of freedom) are saturated
by the first doublet of excited $\Lambda_Q$ states.
|
[
{
"created": "Thu, 17 Feb 1994 21:11:56 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Chow",
"Chi-Keung",
""
],
[
"Wise",
"Mark B.",
""
]
] |
The spectrum of excited $\Lambda_Q$-type heavy baryons is considered in the large $N_c$ limit. The universal form factors for $\Lambda_b$ semileptonic decay to excited charmed baryons are calculated in the large $N_c$ limit. We find that the Bjorken sum rule (for the slope of the Isgur--Wise function) and Voloshin sum rule (for the mass of the light degrees of freedom) are saturated by the first doublet of excited $\Lambda_Q$ states.
|
1711.08796
|
Gazal Sharma
|
Gazal Sharma, Shankita Bhardwaj, B. C. Chauhan and Surender Verma
|
Quark-lepton complementarity model based predictions for
$\theta_{23}^{PMNS}$ with neutrino mass hierarchy
|
3 pages, 3 figures
|
XXII DAE High Energy Physics Symposium, Springer Proc.Phys. 203
(2018) 251-256
|
10.1007/978-3-319-73171-1_57
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
After the successful investigation and confirmation of non zero
$\theta_{13}^{PMNS}$ by various experiments, we are standing at a square where
we still encounter a number of issues, which are to be settled. In this paper,
we have extended our recent work towards a precise prediction of the
$\theta_{23}^{PMNS}$ mixing angle, taking into account the neutrino mass
hierarchy. We parameterize the non-trivial correlation between quark (CKM) and
lepton (PMNS) mixing matrices in quark-lepton complementarity (QLC) model as
$V_{c}= U_{CKM}. \psi. U_{PMNS}$, where $\psi$ is a diagonal phase matrix.
Monte Carlo simulations are used to estimate the texture of $V_{c}$ and compare
the results with the standard Tri-Bi-Maximal (TBM) and Bi-Maximal(BM)
structures of neutrino mixing matrix. We have predicted the value of
$\theta_{23}^{PMNS} $ for normal and inverted neutrino mass hierarchies. The
value of $\theta_{23}^{PMNS}$ obtained for two cases are about $1.3\sigma$ away
from each other, implying the better precision can give us a strong hint for
the type of neutrino mass hierarchy.
|
[
{
"created": "Thu, 23 Nov 2017 18:19:59 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Jun 2018 10:38:47 GMT",
"version": "v2"
}
] |
2018-06-27
|
[
[
"Sharma",
"Gazal",
""
],
[
"Bhardwaj",
"Shankita",
""
],
[
"Chauhan",
"B. C.",
""
],
[
"Verma",
"Surender",
""
]
] |
After the successful investigation and confirmation of non zero $\theta_{13}^{PMNS}$ by various experiments, we are standing at a square where we still encounter a number of issues, which are to be settled. In this paper, we have extended our recent work towards a precise prediction of the $\theta_{23}^{PMNS}$ mixing angle, taking into account the neutrino mass hierarchy. We parameterize the non-trivial correlation between quark (CKM) and lepton (PMNS) mixing matrices in quark-lepton complementarity (QLC) model as $V_{c}= U_{CKM}. \psi. U_{PMNS}$, where $\psi$ is a diagonal phase matrix. Monte Carlo simulations are used to estimate the texture of $V_{c}$ and compare the results with the standard Tri-Bi-Maximal (TBM) and Bi-Maximal(BM) structures of neutrino mixing matrix. We have predicted the value of $\theta_{23}^{PMNS} $ for normal and inverted neutrino mass hierarchies. The value of $\theta_{23}^{PMNS}$ obtained for two cases are about $1.3\sigma$ away from each other, implying the better precision can give us a strong hint for the type of neutrino mass hierarchy.
|
2111.13893
|
Marcos Rodriguez Cardoso
|
M. C. Rodriguez
|
The Masses of Gauge Bosons in $SU(3)_{C}\times SU(2)_{L}\times
U(1)_{Y^{\prime}}\times U(1)_{B-L}$ gauge model
|
29 pages, 15 figures and 7 tables, it was made to present at 6th
ComHEP, last year, and in Dark Matter but I forget to submit it but I have
finnish it I am put my review here and I hope I can present it in some
conference, it is is the continuation of arXiv:2209.04653 [hep-ph] but now
the new VEV contributes to the masses of fermions
| null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We will present within the context of the supersymmetric models with
$SU(3)_{C}\times SU(2)_{L}\times U(1)_{Y^\prime}\times U(1)_{B-L}$ gauge
symmetry an explanation for the new data on the $W$-boson mass recently
presented by the CDF collaboration. We will also study the neutral boson sector
of this model.
|
[
{
"created": "Sat, 27 Nov 2021 13:28:15 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Jun 2024 13:05:52 GMT",
"version": "v2"
}
] |
2024-06-12
|
[
[
"Rodriguez",
"M. C.",
""
]
] |
We will present within the context of the supersymmetric models with $SU(3)_{C}\times SU(2)_{L}\times U(1)_{Y^\prime}\times U(1)_{B-L}$ gauge symmetry an explanation for the new data on the $W$-boson mass recently presented by the CDF collaboration. We will also study the neutral boson sector of this model.
|
1411.0909
|
Daniel Gomez Dumm
|
J.P. Carlomagno, D. Gomez Dumm, N.N. Scoccola
|
Generalized Ginzburg-Landau approach to inhomogeneous phases in nonlocal
chiral quark models
|
9 pages, 1 figure. V2: Two references added, figure modified, minor
changes in the text introduced. Matches version to be published in Physics
Letters B
| null |
10.1016/j.physletb.2015.04.023
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We analyze the presence of inhomogeneous phases in the QCD phase diagram
within the framework of nonlocal chiral quark models. We concentrate in
particular in the positions of the tricritical (TCP) and Lifshitz (LP) points,
which are studied in a general context using a generalized Ginzburg-Landau
approach. We find that for all the phenomenologically acceptable model
parametrizations considered the TCP is located at a higher temperature and a
lower chemical potential in comparison with the LP. Consequently, these models
seem to favor a scenario in which the onset of the first order transition
between homogeneous phases is not covered by an inhomogeneous, energetically
favored phase.
|
[
{
"created": "Tue, 4 Nov 2014 13:52:19 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Apr 2015 20:39:31 GMT",
"version": "v2"
}
] |
2015-05-20
|
[
[
"Carlomagno",
"J. P.",
""
],
[
"Dumm",
"D. Gomez",
""
],
[
"Scoccola",
"N. N.",
""
]
] |
We analyze the presence of inhomogeneous phases in the QCD phase diagram within the framework of nonlocal chiral quark models. We concentrate in particular in the positions of the tricritical (TCP) and Lifshitz (LP) points, which are studied in a general context using a generalized Ginzburg-Landau approach. We find that for all the phenomenologically acceptable model parametrizations considered the TCP is located at a higher temperature and a lower chemical potential in comparison with the LP. Consequently, these models seem to favor a scenario in which the onset of the first order transition between homogeneous phases is not covered by an inhomogeneous, energetically favored phase.
|
hep-ph/0203266
|
Christof Wetterich
|
C.Wetterich
|
Probing Quintessence with Time Variation of Couplings
|
new references,extended introduction,17 pages,LaTex
|
JCAP 0310 (2003) 002
|
10.1088/1475-7516/2003/10/002
|
HD-THEP-02-11
|
hep-ph
| null |
Many models of quintessence predict a time variation of the fundamental
constants as well as a composition-dependent gravity like long-range force
mediated by the cosmon. We present bounds for the cosmon coupling to matter and
radiation within a grand unified framework. The unification scale, the unified
gauge coupling and the Fermi scale are allowed to vary independently. We find
that the variation of the weak scale compared to the nucleon mass is severely
restricted. The violation of the equivalence principle turns out to be
substantially larger than in models where only the electromagnetic fine
structure constant varies with time. We also show that in contrast to gravity
the local cosmon field in a condensed object does not decouple from the
cosmological evolution. In consequence, the cosmon interaction constitutes a
possible quantitative link between cosmological observations and several areas
of high precision experiments concerning the local time or space variation of
couplings and tests of the equivalence principle.
|
[
{
"created": "Thu, 28 Mar 2002 11:32:08 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Dec 2002 10:11:03 GMT",
"version": "v2"
},
{
"created": "Wed, 5 Mar 2003 18:03:07 GMT",
"version": "v3"
}
] |
2009-11-07
|
[
[
"Wetterich",
"C.",
""
]
] |
Many models of quintessence predict a time variation of the fundamental constants as well as a composition-dependent gravity like long-range force mediated by the cosmon. We present bounds for the cosmon coupling to matter and radiation within a grand unified framework. The unification scale, the unified gauge coupling and the Fermi scale are allowed to vary independently. We find that the variation of the weak scale compared to the nucleon mass is severely restricted. The violation of the equivalence principle turns out to be substantially larger than in models where only the electromagnetic fine structure constant varies with time. We also show that in contrast to gravity the local cosmon field in a condensed object does not decouple from the cosmological evolution. In consequence, the cosmon interaction constitutes a possible quantitative link between cosmological observations and several areas of high precision experiments concerning the local time or space variation of couplings and tests of the equivalence principle.
|
2312.09099
|
Darius Jurciukonis
|
Francisco Albergaria, Darius Jur\v{c}iukonis, Lu\'is Lavoura
|
The oblique parameters from arbitrary new fermions
|
30 pages, 10 figures; v2: added references; v3: modified figures,
added appendix, matches published version
|
JHEP05(2024)190
|
10.1007/JHEP05(2024)190
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We compute the six oblique parameters $S, T, U, V, W, X$ in a New Physics
Model with an arbitrary number of new fermions, in arbitrary representations of
$SU(2) \times U(1)$, and mixing arbitrarily among themselves. We show that $S$
and $U$ are automatically finite, but $T$ is finite only if there is a specific
relation between the masses of the new fermions and the representations of
$SU(2) \times U(1)$ that they sit in. We apply our general computation to two
illustrative cases.
|
[
{
"created": "Thu, 14 Dec 2023 16:37:16 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Dec 2023 15:40:02 GMT",
"version": "v2"
},
{
"created": "Fri, 17 May 2024 10:51:51 GMT",
"version": "v3"
}
] |
2024-05-20
|
[
[
"Albergaria",
"Francisco",
""
],
[
"Jurčiukonis",
"Darius",
""
],
[
"Lavoura",
"Luís",
""
]
] |
We compute the six oblique parameters $S, T, U, V, W, X$ in a New Physics Model with an arbitrary number of new fermions, in arbitrary representations of $SU(2) \times U(1)$, and mixing arbitrarily among themselves. We show that $S$ and $U$ are automatically finite, but $T$ is finite only if there is a specific relation between the masses of the new fermions and the representations of $SU(2) \times U(1)$ that they sit in. We apply our general computation to two illustrative cases.
|
2312.17203
|
Ajay Kaladharan
|
Tomohiro Abe, K.S. Babu and Ajay Kaladharan
|
Gravitational Wave Signatures of a Chiral Fermion Dark Matter Model
|
19 pages, 3 figures and 1 table, Matches the published version
| null | null | null |
hep-ph astro-ph.CO
|
http://creativecommons.org/licenses/by/4.0/
|
Theories in which the dark matter (DM) candidate is a fermion transforming
chirally under a gauge symmetry are attractive, as the gauge symmetry would
protect the DM mass. In such theories, the universe would have undergone a
phase transition at early times that generated the DM mass upon spontaneous
breaking of the gauge symmetry. In this paper, we explore the gravitational
wave signals of a simple such theory based on an $\mathrm{SU}(2)_\mathrm{D}$
dark sector with a dark isospin-$3/2$ fermion serving as the DM candidate. This
is arguably the simplest chiral theory possible. The scalar sector consists of
a dark isospin-$3$ multiplet which breaks the $\mathrm{SU}(2)_\mathrm{D}$ gauge
symmetry and also generates the DM mass. We construct the full thermal
potential of the model and identify regions of parameter space which lead to
detectable gravitational wave signals, arising from a strong first-order
$\mathrm{SU}(2)_\mathrm{D}$ phase transition, in various planned space-based
interferometers, while also being consistent with dark matter relic abundance.
Bulk of the parameter space exhibiting detectable gravitational wave signals in
the model also has large WIMP-nucleon scattering cross sections, $\sigma_{\rm
SI}$, which could be probed in upcoming direct detection experiments.
|
[
{
"created": "Thu, 28 Dec 2023 18:35:21 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Aug 2024 16:41:29 GMT",
"version": "v2"
}
] |
2024-08-14
|
[
[
"Abe",
"Tomohiro",
""
],
[
"Babu",
"K. S.",
""
],
[
"Kaladharan",
"Ajay",
""
]
] |
Theories in which the dark matter (DM) candidate is a fermion transforming chirally under a gauge symmetry are attractive, as the gauge symmetry would protect the DM mass. In such theories, the universe would have undergone a phase transition at early times that generated the DM mass upon spontaneous breaking of the gauge symmetry. In this paper, we explore the gravitational wave signals of a simple such theory based on an $\mathrm{SU}(2)_\mathrm{D}$ dark sector with a dark isospin-$3/2$ fermion serving as the DM candidate. This is arguably the simplest chiral theory possible. The scalar sector consists of a dark isospin-$3$ multiplet which breaks the $\mathrm{SU}(2)_\mathrm{D}$ gauge symmetry and also generates the DM mass. We construct the full thermal potential of the model and identify regions of parameter space which lead to detectable gravitational wave signals, arising from a strong first-order $\mathrm{SU}(2)_\mathrm{D}$ phase transition, in various planned space-based interferometers, while also being consistent with dark matter relic abundance. Bulk of the parameter space exhibiting detectable gravitational wave signals in the model also has large WIMP-nucleon scattering cross sections, $\sigma_{\rm SI}$, which could be probed in upcoming direct detection experiments.
|
2009.07115
|
Valery Lyubovitskij
|
Valery E. Lyubovitskij, Ivan Schmidt
|
Nucleon resonances with higher spins in soft-wall AdS/QCD
| null |
Phys. Rev. D 102, 094008 (2020)
|
10.1103/PhysRevD.102.094008
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a study of electroexcitation of nucleon resonances with higher
spins, in a soft-wall AdS/QCD model, comparing our results with existing data
from the CLAS Collaboration at JLab, from MAMI, and other experiments.
|
[
{
"created": "Tue, 15 Sep 2020 14:14:01 GMT",
"version": "v1"
}
] |
2020-11-13
|
[
[
"Lyubovitskij",
"Valery E.",
""
],
[
"Schmidt",
"Ivan",
""
]
] |
We present a study of electroexcitation of nucleon resonances with higher spins, in a soft-wall AdS/QCD model, comparing our results with existing data from the CLAS Collaboration at JLab, from MAMI, and other experiments.
|
1811.03950
|
Juergen Reuter
|
J\"urgen Reuter, Bijan Chokouf\'e Nejad, Andre Hoang, Wolfgang Kilian,
Maximilian Stahlhofen, Thomas Teubner, Christian Weiss
|
Exclusive Top Threshold Matching at Lepton Colliders
|
6 pages, 2 figures, to be submitted to proceedings of ICHEP 2018.
arXiv admin note: substantial text overlap with arXiv:1801.08083
| null | null |
DESY 18-192, LTH 1176, MITP/18-110, SI-HEP-2018-33, UWTHPH-2018-27
|
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
The threshold scan at future lepton colliders is the most precise known
method to determine the top quark mass (well below 100 MeV), a fundamental
parameter of the Standard Model that co-determines the stability properties of
the electroweak vacuum. We present a new method to match the continuum
next-to-leading order QCD corrections with the next-to-leading logarithmic
resummation of the Coulomb singularities of the quasi-toponium bound state at
threshold where fixed-order perturbation theory is invalid. This matching is
performed at the level of the fully exclusive $W^+bW^-\bar{b}$ final state. It
allows to study all kinds of differential distributions at or close to
threshold. The top mass dependence of these distributions opens up new
possibilities for the top mass determination that might be competitive with the
inclusive threshold scan.
|
[
{
"created": "Thu, 8 Nov 2018 16:05:02 GMT",
"version": "v1"
}
] |
2018-11-12
|
[
[
"Reuter",
"Jürgen",
""
],
[
"Nejad",
"Bijan Chokoufé",
""
],
[
"Hoang",
"Andre",
""
],
[
"Kilian",
"Wolfgang",
""
],
[
"Stahlhofen",
"Maximilian",
""
],
[
"Teubner",
"Thomas",
""
],
[
"Weiss",
"Christian",
""
]
] |
The threshold scan at future lepton colliders is the most precise known method to determine the top quark mass (well below 100 MeV), a fundamental parameter of the Standard Model that co-determines the stability properties of the electroweak vacuum. We present a new method to match the continuum next-to-leading order QCD corrections with the next-to-leading logarithmic resummation of the Coulomb singularities of the quasi-toponium bound state at threshold where fixed-order perturbation theory is invalid. This matching is performed at the level of the fully exclusive $W^+bW^-\bar{b}$ final state. It allows to study all kinds of differential distributions at or close to threshold. The top mass dependence of these distributions opens up new possibilities for the top mass determination that might be competitive with the inclusive threshold scan.
|
hep-ph/0403247
|
John Ellis
|
John Ellis
|
Sneutrino Inflation
|
16 pages, 10 figures, Invited talk at the Fujihara Seminar on
Neutrino Mass and Seesaw Mechanism, KEK, Feb. 23-25, 2004
|
Nucl.Phys.Proc.Suppl.137:190-205,2004
|
10.1016/j.nuclphysbps.2004.10.070
|
CERN-PH-TH/2004-057
|
hep-ph astro-ph
| null |
The seesaw model of neutrinos might explain the size, age, flatness and
near-homogeneity of the Universe via sneutrino inflation, as well as explaining
the origin of matter via leptogenesis. The sneutrino inflation hypothesis makes
specific, testable predictions for cosmic microwave background observables,
which are compatible with the first release of data from WMAP, and for
flavour-violating charged-lepton decays. In particular, mu -> e gamma should
occur with a branching ratio very close to the present experimental upper
limit, whilst tau -> mu gamma and e gamma should occur further below the
present limits.
|
[
{
"created": "Tue, 23 Mar 2004 17:54:03 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Ellis",
"John",
""
]
] |
The seesaw model of neutrinos might explain the size, age, flatness and near-homogeneity of the Universe via sneutrino inflation, as well as explaining the origin of matter via leptogenesis. The sneutrino inflation hypothesis makes specific, testable predictions for cosmic microwave background observables, which are compatible with the first release of data from WMAP, and for flavour-violating charged-lepton decays. In particular, mu -> e gamma should occur with a branching ratio very close to the present experimental upper limit, whilst tau -> mu gamma and e gamma should occur further below the present limits.
|
1803.08064
|
Tommi Tenkanen
|
Nicol\'as Bernal, Catarina Cosme, Tommi Tenkanen
|
Phenomenology of Self-Interacting Dark Matter in a Matter-Dominated
Universe
|
19 pages, 8 figures. v2: Method for solving Boltzmann equations
clarified, plots updated, discussion and references added. The main results
remain unchanged. v3: Minor modifications, matches the version accepted for
publication
| null |
10.1140/epjc/s10052-019-6608-8
|
PI/UAN-2018-622FT
|
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study production of self-interacting dark matter (DM) during an early
matter-dominated phase. As a benchmark scenario, we consider a model where the
DM consists of singlet scalar particles coupled to the visible Standard Model
(SM) sector via the Higgs portal. We consider scenarios where the initial DM
abundance is set by either the usual thermal freeze-out or an alternative
freeze-in mechanism, where DM was never in thermal equilibrium with the SM
sector. For the first time, we take the effect of self-interactions within the
hidden sector into account in determining the DM abundance, reminiscent to the
Strongly Interacting Massive Particle (SIMP) scenario. In all cases, the number
density of DM may change considerably compared to the standard
radiation-dominated case, having important observational and experimental
ramifications.
|
[
{
"created": "Wed, 21 Mar 2018 18:00:39 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Nov 2018 15:36:33 GMT",
"version": "v2"
},
{
"created": "Sat, 19 Jan 2019 21:17:26 GMT",
"version": "v3"
}
] |
2019-02-20
|
[
[
"Bernal",
"Nicolás",
""
],
[
"Cosme",
"Catarina",
""
],
[
"Tenkanen",
"Tommi",
""
]
] |
We study production of self-interacting dark matter (DM) during an early matter-dominated phase. As a benchmark scenario, we consider a model where the DM consists of singlet scalar particles coupled to the visible Standard Model (SM) sector via the Higgs portal. We consider scenarios where the initial DM abundance is set by either the usual thermal freeze-out or an alternative freeze-in mechanism, where DM was never in thermal equilibrium with the SM sector. For the first time, we take the effect of self-interactions within the hidden sector into account in determining the DM abundance, reminiscent to the Strongly Interacting Massive Particle (SIMP) scenario. In all cases, the number density of DM may change considerably compared to the standard radiation-dominated case, having important observational and experimental ramifications.
|
hep-ph/9311297
|
Oscar Eboli
|
J.E. Cieza Montalvo and O.J.P. Eboli
|
Signals for Vector Leptoquarks in Hadronic Collisions
|
15 pages and 5 figures (available upon request or through anonymous
ftp), revtex3, IFUSP-P 1083
|
Phys.Rev. D50 (1994) 331-336
|
10.1103/PhysRevD.50.331
| null |
hep-ph
| null |
We analyze systematically the signatures of vector leptoquarks in hadronic
collisions. We examine their single and pair productions, as well as their
effects on the production of lepton pairs. Our results indicate that a machine
like the CERN Large Hadron Collider (LHC) will be able to unravel the existence
of vector leptoquarks with masses up to the range of $2$--$3$ TeV.
|
[
{
"created": "Mon, 15 Nov 1993 22:27:00 GMT",
"version": "v1"
}
] |
2009-10-22
|
[
[
"Montalvo",
"J. E. Cieza",
""
],
[
"Eboli",
"O. J. P.",
""
]
] |
We analyze systematically the signatures of vector leptoquarks in hadronic collisions. We examine their single and pair productions, as well as their effects on the production of lepton pairs. Our results indicate that a machine like the CERN Large Hadron Collider (LHC) will be able to unravel the existence of vector leptoquarks with masses up to the range of $2$--$3$ TeV.
|
hep-ph/0503091
|
Tadashi Yoshikawa
|
Satoshi Mishima (Tohoku U.) and Tadashi Yoshikawa (Nagoya U.)
|
Possibility of Large EW Penguin contribution
|
8 pages, 2 figures, Talk presented at International Conference on
Flaver Physics and CP violation (FPCP2004), Daegu Korea, Oct. 4-9, 2004 and
YITP workshop on CP Violation and Matter and Anti-Matter Asymmetry, Kyoto,
Japan, Jan. 12-14, 2005
| null | null | null |
hep-ph
| null |
We discuss a possibility of large electroweak(EW) penguin contribution in
B-->K pi and pi pi. The recent experimental data may be still suggesting that
there are some discrepancies between the data and theoretical estimations. In B
--> K pi decays, to explain several theoretical relations among the branching
ratios, a slightly large electroweak penguin contribution and large strong
phase differences or quite large color suppressed tree contribution seem to be
needed. The contributions should appear also in B --> pi pi. We show, as an
example, a solution to solve the discrepancies in both B --> K pi and B --> pi
pi. It may be suggesting to need the large electroweak penguin contribution
with new weak phases and some SU(3) breaking effects by new physics in both QCD
and electroweak penguin type processes.
|
[
{
"created": "Thu, 10 Mar 2005 04:53:51 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Mar 2005 00:24:39 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Mishima",
"Satoshi",
"",
"Tohoku U."
],
[
"Yoshikawa",
"Tadashi",
"",
"Nagoya U."
]
] |
We discuss a possibility of large electroweak(EW) penguin contribution in B-->K pi and pi pi. The recent experimental data may be still suggesting that there are some discrepancies between the data and theoretical estimations. In B --> K pi decays, to explain several theoretical relations among the branching ratios, a slightly large electroweak penguin contribution and large strong phase differences or quite large color suppressed tree contribution seem to be needed. The contributions should appear also in B --> pi pi. We show, as an example, a solution to solve the discrepancies in both B --> K pi and B --> pi pi. It may be suggesting to need the large electroweak penguin contribution with new weak phases and some SU(3) breaking effects by new physics in both QCD and electroweak penguin type processes.
|
1802.06111
|
Adrian Dumitru
|
Adrian Dumitru, Gary Kapilevich and Vladimir Skokov
|
The small-x gluon distribution in centrality biased pA and pp collisions
|
14 pages, 5 figures
| null |
10.1016/j.nuclphysa.2018.03.012
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The nuclear modification factor $R_{pA}(p_T)$ provides information on the
small-$x$ gluon distribution of a nucleus at hadron colliders. Several
experiments have recently measured the nuclear modification factor not only in
minimum bias but also for central $pA$ collisions. In this paper we analyze the
bias on the configurations of soft gluon fields introduced by a centrality
selection via the number of hard particles. Such bias can be viewed as
reweighting of configurations of small-$x$ gluons. We find that the biased
nuclear modification factor ${\cal Q}_{pA}(p_T)$ for central collisions is
above $R_{pA}(p_T)$ for minimum bias events, and that it may redevelop a
"Cronin peak" even at small $x$. The magnitude of the peak is predicted to
increase approximately like $1/{A_{\perp}}^\nu$, $\nu\sim0.6\pm0.1$, if one is
able to select more compact configurations of the projectile proton where its
gluons occupy a smaller transverse area $A_\perp$. We predict an enhanced
${\cal
Q}_{pp}(p_T)-1 \sim 1/(p_T^2)^\nu$ and a Cronin peak even for central $pp$
collisions.
|
[
{
"created": "Fri, 16 Feb 2018 20:31:18 GMT",
"version": "v1"
}
] |
2018-05-09
|
[
[
"Dumitru",
"Adrian",
""
],
[
"Kapilevich",
"Gary",
""
],
[
"Skokov",
"Vladimir",
""
]
] |
The nuclear modification factor $R_{pA}(p_T)$ provides information on the small-$x$ gluon distribution of a nucleus at hadron colliders. Several experiments have recently measured the nuclear modification factor not only in minimum bias but also for central $pA$ collisions. In this paper we analyze the bias on the configurations of soft gluon fields introduced by a centrality selection via the number of hard particles. Such bias can be viewed as reweighting of configurations of small-$x$ gluons. We find that the biased nuclear modification factor ${\cal Q}_{pA}(p_T)$ for central collisions is above $R_{pA}(p_T)$ for minimum bias events, and that it may redevelop a "Cronin peak" even at small $x$. The magnitude of the peak is predicted to increase approximately like $1/{A_{\perp}}^\nu$, $\nu\sim0.6\pm0.1$, if one is able to select more compact configurations of the projectile proton where its gluons occupy a smaller transverse area $A_\perp$. We predict an enhanced ${\cal Q}_{pp}(p_T)-1 \sim 1/(p_T^2)^\nu$ and a Cronin peak even for central $pp$ collisions.
|
1811.05478
|
Jose Miguel No
|
G. B\'elanger, N. Desai, A. Goudelis, J. Harz, A. Lessa, J.M. No, A.
Pukhov, S. Sekmen, D. Sengupta, B. Zaldivar, J. Zurita
|
LHC-friendly minimal freeze-in models
| null | null |
10.1007/JHEP02(2019)186
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We propose simple freeze-in models where the observed dark matter abundance
is explained via the decay of an electrically charged and/or coloured parent
particle into Feebly Interacting Massive Particles (FIMP). The parent particle
is long-lived and yields a wide variety of LHC signatures depending on its
lifetime and quantum numbers. We assess the current constraints and future high
luminosity reach of these scenarios at the LHC from searches for heavy stable
charged particles, disappearing tracks, displaced vertices and displaced
leptons. We show that the LHC constitutes a powerful probe of freeze-in dark
matter and can further provide interesting insights on the validity of vanilla
baryogenesis and leptogenesis scenarios.
|
[
{
"created": "Tue, 13 Nov 2018 19:00:01 GMT",
"version": "v1"
}
] |
2019-03-27
|
[
[
"Bélanger",
"G.",
""
],
[
"Desai",
"N.",
""
],
[
"Goudelis",
"A.",
""
],
[
"Harz",
"J.",
""
],
[
"Lessa",
"A.",
""
],
[
"No",
"J. M.",
""
],
[
"Pukhov",
"A.",
""
],
[
"Sekmen",
"S.",
""
],
[
"Sengupta",
"D.",
""
],
[
"Zaldivar",
"B.",
""
],
[
"Zurita",
"J.",
""
]
] |
We propose simple freeze-in models where the observed dark matter abundance is explained via the decay of an electrically charged and/or coloured parent particle into Feebly Interacting Massive Particles (FIMP). The parent particle is long-lived and yields a wide variety of LHC signatures depending on its lifetime and quantum numbers. We assess the current constraints and future high luminosity reach of these scenarios at the LHC from searches for heavy stable charged particles, disappearing tracks, displaced vertices and displaced leptons. We show that the LHC constitutes a powerful probe of freeze-in dark matter and can further provide interesting insights on the validity of vanilla baryogenesis and leptogenesis scenarios.
|
2211.07236
|
Ludovico Vittorio
|
Guido Martinelli, Silvano Simula, Ludovico Vittorio
|
A novel approach to semileptonic heavy-to-light $B$ decays through the
Dispersive Matrix method
|
6 pages, 2 figures. Proceedings for the 41st International Conference
on High Energy physics - ICHEP2022
| null | null | null |
hep-ph hep-ex hep-lat
|
http://creativecommons.org/licenses/by/4.0/
|
In this contribution we analyse the heavy-to-light $B$ decays through the
Dispersive Matrix method, which can be applied to any semileptonic decays of
hadrons once lattice QCD computations of the hadronic Form Factors and of the
relevant susceptibilities are available. We will explicitly discuss the
application of the Dispersive Matrix approach to both $B \to \pi \ell
\nu_{\ell}$ and $B_s \to K \ell \nu_{\ell}$ decays. As usual in our analysis
strategy, only LQCD computations of the FFs at high values of the momentum
transfer will be used to determine the shape of the FFs in the whole
kinematical range without making any assumption on their momentum dependence.
Then, the experimental data will be used only to obtain our final exclusive
determinations of $\vert V_{ub} \vert$. In this way, our calculation of the FFs
allows to obtain pure theoretical estimates of several quantities of
phenomenological interest, for instance the $\tau/\mu$ ratio of the
differential decay rates $R_{\pi(K)}^{\tau/\mu}$, which is an important tool
for testing Lepton Flavour Universality. We will also present a summary of all
the results obtained so far for semileptonic $B$ decays within the Dispersive
Matrix approach.
|
[
{
"created": "Mon, 14 Nov 2022 09:51:05 GMT",
"version": "v1"
}
] |
2022-11-15
|
[
[
"Martinelli",
"Guido",
""
],
[
"Simula",
"Silvano",
""
],
[
"Vittorio",
"Ludovico",
""
]
] |
In this contribution we analyse the heavy-to-light $B$ decays through the Dispersive Matrix method, which can be applied to any semileptonic decays of hadrons once lattice QCD computations of the hadronic Form Factors and of the relevant susceptibilities are available. We will explicitly discuss the application of the Dispersive Matrix approach to both $B \to \pi \ell \nu_{\ell}$ and $B_s \to K \ell \nu_{\ell}$ decays. As usual in our analysis strategy, only LQCD computations of the FFs at high values of the momentum transfer will be used to determine the shape of the FFs in the whole kinematical range without making any assumption on their momentum dependence. Then, the experimental data will be used only to obtain our final exclusive determinations of $\vert V_{ub} \vert$. In this way, our calculation of the FFs allows to obtain pure theoretical estimates of several quantities of phenomenological interest, for instance the $\tau/\mu$ ratio of the differential decay rates $R_{\pi(K)}^{\tau/\mu}$, which is an important tool for testing Lepton Flavour Universality. We will also present a summary of all the results obtained so far for semileptonic $B$ decays within the Dispersive Matrix approach.
|
hep-ph/9503389
|
Jim Ohnemus
|
J. Ohnemus
|
QCD Corrections to Diboson Production
|
Latex file uses epsfig.sty, 12 postscript figures (uuencoded) will be
added with figures command. Full postscript version, complete with embedded
figures, is available at
ftp://ucdhep.ucdavis.edu/ohnemus/ucd-95-9/ucd-95-9.ps . To appear in the
Proceedings of the International Symposium on Vector Boson Self-Interactions,
UCLA, Feb. 1--3, 1995.
| null |
10.1063/1.49291
|
UCD-95-9
|
hep-ph
| null |
The QCD radiative corrections to hadronic diboson production are reviewed.
The radiative corrections for $W^{\pm}\gamma$, $Z\gamma$, $ZZ$, $W^+W^-$, and
$W^{\pm} Z$ are discussed. Similarities and differences in the behavior of the
order $\alpha_s$ cross sections for these processes are emphasized.
|
[
{
"created": "Mon, 20 Mar 1995 20:21:11 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Mar 1995 19:10:13 GMT",
"version": "v2"
}
] |
2009-10-28
|
[
[
"Ohnemus",
"J.",
""
]
] |
The QCD radiative corrections to hadronic diboson production are reviewed. The radiative corrections for $W^{\pm}\gamma$, $Z\gamma$, $ZZ$, $W^+W^-$, and $W^{\pm} Z$ are discussed. Similarities and differences in the behavior of the order $\alpha_s$ cross sections for these processes are emphasized.
|
1607.02475
|
Alfredo Urbano
|
Sebastian Bruggisser, Francesco Riva, Alfredo Urbano
|
The Last Gasp of Dark Matter Effective Theory
|
27 pages + appendices, 7 figures
| null |
10.1007/JHEP11(2016)069
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss an interesting class of models, based on strongly coupled Dark
Matter (DM), where sizable effects can be expected in LHC missing energy (MET)
searches, compatibly with a large separation of scales. In this case, an
effective field theory (EFT) is appropriate (and sometimes necessary) to
describe the most relevant interactions at the LHC. The selection rules implied
by the structure of the new strong dynamics shape the EFT in an unusual way,
revealing the importance of higher-derivative interactions previously ignored.
We compare indications from relic density and direct detection experiments with
consistent LHC constraints, and asses the relative importance of the latter.
Our analysis provides an interesting and well-motivated scenario to model MET
at the LHC in terms of a handful of parameters.
|
[
{
"created": "Fri, 8 Jul 2016 18:04:29 GMT",
"version": "v1"
}
] |
2016-12-21
|
[
[
"Bruggisser",
"Sebastian",
""
],
[
"Riva",
"Francesco",
""
],
[
"Urbano",
"Alfredo",
""
]
] |
We discuss an interesting class of models, based on strongly coupled Dark Matter (DM), where sizable effects can be expected in LHC missing energy (MET) searches, compatibly with a large separation of scales. In this case, an effective field theory (EFT) is appropriate (and sometimes necessary) to describe the most relevant interactions at the LHC. The selection rules implied by the structure of the new strong dynamics shape the EFT in an unusual way, revealing the importance of higher-derivative interactions previously ignored. We compare indications from relic density and direct detection experiments with consistent LHC constraints, and asses the relative importance of the latter. Our analysis provides an interesting and well-motivated scenario to model MET at the LHC in terms of a handful of parameters.
|
0908.0899
|
Dan Hooper
|
Thomas Flacke, Arjun Menon, Dan Hooper, and Katherine Freese
|
Kaluza-Klein Dark Matter And Neutrinos From Annihilation In The Sun
|
6 pages, 6 figures
| null | null |
MCTP-09-37, FERMILAB-PUB-09-384-A
|
hep-ph astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In models with one universal extra dimension (UED), the first Kaluza-Klein
excitations of the hypercharge gauge boson, B^(1), and the neutral component of
isospin gauge boson, W^3(1), are each viable dark matter candidates. In either
case, such particles are predicted to accumulate in the core of the Sun, where
they annihilate to generate a potentially observable flux of high energy
neutrinos. In this article, we calculate the flux of neutrinos produced in this
model and determine the constraints that can be placed on the UED parameter
space from current IceCube data. For the case of B^(1) dark matter, we find
that the present limits from IceCube are stronger than those from direct dark
matter detection experiments such as CDMS and XENON10. For W^3(1) dark matter,
the present IceCube data provides a constraint slightly weaker than direct
detection experiments. In addition, we also present the projected regions of
UED parameter space that can be probed by IceCube/DeepCore in the near future
and compare them to the prospects for future direct detection experiments.
|
[
{
"created": "Thu, 6 Aug 2009 16:05:28 GMT",
"version": "v1"
}
] |
2009-08-11
|
[
[
"Flacke",
"Thomas",
""
],
[
"Menon",
"Arjun",
""
],
[
"Hooper",
"Dan",
""
],
[
"Freese",
"Katherine",
""
]
] |
In models with one universal extra dimension (UED), the first Kaluza-Klein excitations of the hypercharge gauge boson, B^(1), and the neutral component of isospin gauge boson, W^3(1), are each viable dark matter candidates. In either case, such particles are predicted to accumulate in the core of the Sun, where they annihilate to generate a potentially observable flux of high energy neutrinos. In this article, we calculate the flux of neutrinos produced in this model and determine the constraints that can be placed on the UED parameter space from current IceCube data. For the case of B^(1) dark matter, we find that the present limits from IceCube are stronger than those from direct dark matter detection experiments such as CDMS and XENON10. For W^3(1) dark matter, the present IceCube data provides a constraint slightly weaker than direct detection experiments. In addition, we also present the projected regions of UED parameter space that can be probed by IceCube/DeepCore in the near future and compare them to the prospects for future direct detection experiments.
|
hep-ph/9606229
|
Adam Leibovich
|
Peter Cho and Adam K. Leibovich
|
Color-Singlet $\psi_Q$ Production at $e^+e^-$ Colliders
|
17 pages RevTeX, 5 embedded ps/eps figures
|
Phys.Rev. D54 (1996) 6690-6695
|
10.1103/PhysRevD.54.6690
|
CALT-68-2060
|
hep-ph
| null |
We calculate in closed form the complete ${\mathcal O}(\alpha_s^2)$
color-singlet differential cross section for $e^+e^- \to \gamma^* \to \psi_Q+X$
scattering. The cross section reduces at high energies to a heavy quark
fragmentation form. We find that the energy scale at which the approximate
fragmentation result becomes reliable exceeds the $\psi_Q$ mass by more than an
order of magnitude. We also discuss the color-singlet model's predictions for
direct $J/\psi$ angular and energy distributions at CLEO.
|
[
{
"created": "Tue, 4 Jun 1996 18:50:05 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Cho",
"Peter",
""
],
[
"Leibovich",
"Adam K.",
""
]
] |
We calculate in closed form the complete ${\mathcal O}(\alpha_s^2)$ color-singlet differential cross section for $e^+e^- \to \gamma^* \to \psi_Q+X$ scattering. The cross section reduces at high energies to a heavy quark fragmentation form. We find that the energy scale at which the approximate fragmentation result becomes reliable exceeds the $\psi_Q$ mass by more than an order of magnitude. We also discuss the color-singlet model's predictions for direct $J/\psi$ angular and energy distributions at CLEO.
|
1910.07864
|
Yuber F. Perez-Gonzalez
|
Cecilia Lunardini, Yuber F. Perez-Gonzalez
|
Dirac and Majorana neutrino signatures of primordial black holes
|
24 pages, 8 figures, extended discussions, specially on massive
neutrino emission; references added, minor corrections, conclusions
unchanged. Matches published version
|
JCAP08(2020)014
|
10.1088/1475-7516/2020/08/014
|
FERMILAB-PUB-19-521-T, NUHEP-TH/19-14
|
hep-ph astro-ph.CO
|
http://creativecommons.org/licenses/by/4.0/
|
We study Primordial Black Holes (PBHs) as sources of massive neutrinos via
Hawking radiation. Under the hypothesis that black holes emit neutrino mass
eigenstates, we describe quantitatively how the PBH evolution and lifetime is
affected by the mass and fermionic -- Dirac or Majorana -- nature of neutrinos.
In the case of Dirac neutrinos, PBHs radiate right-handed and left-handed
neutrinos in equal amounts, thus possibly increasing the effective number of
neutrino species, $N_{\rm eff}$. Assuming an initially monochromatic PBH mass
spectrum, with the initial mass $M_i$ related to the particle horizon mass, and
considering the current constraint on $N_{\rm eff}$, we derive a bound on the
initial PBH fraction $\beta^\prime$ in the interval $4.3\times 10^7\ {\rm
g}\lesssim M_i \lesssim 10^9$ g. Future measurements of $N_{\rm eff}$ may be
able to constraint the initial fraction for black hole masses as low as 1 g. If
an excess in $N_{\rm eff}$ is found, PBHs with Dirac neutrinos could provide a
minimal explanation of it. For example, for $10^7\ {\rm g} \lesssim M_i\lesssim
10^9$ g and $\beta^\prime \gtrsim 10^{-13}$, an excess radiation at the level
of $0.2\lesssim \Delta N_{\rm eff}\lesssim 0.37$ is produced, which can
alleviate the tension of the Hubble parameter measurements. Finally, we obtain
the diffuse flux of right-helical neutrinos from PBHs at the Earth, and show
that their detection in a PTOLEMY-like detector (using neutrino capture on
tritium) would be difficult.
|
[
{
"created": "Thu, 17 Oct 2019 12:47:00 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Aug 2020 15:51:36 GMT",
"version": "v2"
}
] |
2020-08-07
|
[
[
"Lunardini",
"Cecilia",
""
],
[
"Perez-Gonzalez",
"Yuber F.",
""
]
] |
We study Primordial Black Holes (PBHs) as sources of massive neutrinos via Hawking radiation. Under the hypothesis that black holes emit neutrino mass eigenstates, we describe quantitatively how the PBH evolution and lifetime is affected by the mass and fermionic -- Dirac or Majorana -- nature of neutrinos. In the case of Dirac neutrinos, PBHs radiate right-handed and left-handed neutrinos in equal amounts, thus possibly increasing the effective number of neutrino species, $N_{\rm eff}$. Assuming an initially monochromatic PBH mass spectrum, with the initial mass $M_i$ related to the particle horizon mass, and considering the current constraint on $N_{\rm eff}$, we derive a bound on the initial PBH fraction $\beta^\prime$ in the interval $4.3\times 10^7\ {\rm g}\lesssim M_i \lesssim 10^9$ g. Future measurements of $N_{\rm eff}$ may be able to constraint the initial fraction for black hole masses as low as 1 g. If an excess in $N_{\rm eff}$ is found, PBHs with Dirac neutrinos could provide a minimal explanation of it. For example, for $10^7\ {\rm g} \lesssim M_i\lesssim 10^9$ g and $\beta^\prime \gtrsim 10^{-13}$, an excess radiation at the level of $0.2\lesssim \Delta N_{\rm eff}\lesssim 0.37$ is produced, which can alleviate the tension of the Hubble parameter measurements. Finally, we obtain the diffuse flux of right-helical neutrinos from PBHs at the Earth, and show that their detection in a PTOLEMY-like detector (using neutrino capture on tritium) would be difficult.
|
2308.01352
|
Jacek Ksawery Osi\'nski
|
Paola Arias, Nicol\'as Bernal, Jacek K. Osi\'nski, Leszek Roszkowski,
Moira Venegas
|
Revisiting signatures of thermal axions in nonstandard cosmologies
|
44 pages, 12 figures; updated to match published version
|
Phys. Rev. D 109, 123529 (2024)
|
10.1103/PhysRevD.109.123529
| null |
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We revisit the formation of a thermal population of hadronic axions in
nonstandard cosmologies, in light of the recent developments in obtaining
continuous and smooth interaction rates for both the gluon and photon
couplings. For certain cosmological histories, such as low-temperature
reheating (LTR) and kination-like scenarios, the thermalization of the axion
can be severely delayed to higher masses. In the case that thermal equilibrium
is achieved, we improve the constraints on LTR for axion masses around the eV
scale with respect to previous works and we constrain for the first time early
matter-dominated (EMD) cosmologies. We also point out the possibility of having
the co-existence of cold and warm dark matter populations of axions in
kination-like scenarios in the eV mass range.
|
[
{
"created": "Wed, 2 Aug 2023 18:00:13 GMT",
"version": "v1"
},
{
"created": "Tue, 18 Jun 2024 10:41:08 GMT",
"version": "v2"
}
] |
2024-06-19
|
[
[
"Arias",
"Paola",
""
],
[
"Bernal",
"Nicolás",
""
],
[
"Osiński",
"Jacek K.",
""
],
[
"Roszkowski",
"Leszek",
""
],
[
"Venegas",
"Moira",
""
]
] |
We revisit the formation of a thermal population of hadronic axions in nonstandard cosmologies, in light of the recent developments in obtaining continuous and smooth interaction rates for both the gluon and photon couplings. For certain cosmological histories, such as low-temperature reheating (LTR) and kination-like scenarios, the thermalization of the axion can be severely delayed to higher masses. In the case that thermal equilibrium is achieved, we improve the constraints on LTR for axion masses around the eV scale with respect to previous works and we constrain for the first time early matter-dominated (EMD) cosmologies. We also point out the possibility of having the co-existence of cold and warm dark matter populations of axions in kination-like scenarios in the eV mass range.
|
hep-ph/0204116
|
Krzywicki
|
A. Krzywicki
|
Inclusive Spectra and Quantum Stochastic Processes
|
3 pages, 2-column revtex format, format changed and references added
| null | null |
LPT-Orsay 02/31
|
hep-ph
| null |
We try to explain the apparently "thermal" shape of the inclusive transverse
momentum spectrum. We conjecture that prior to the collision, parton-parton
interactions generate a kind of a stochastic process driving the one-particle
spectrum within a hadron towards the thermal shape it would have in a classical
gas. We illustrate this idea, which might have a more general relevance, with a
simple, exactly solvable model.
|
[
{
"created": "Wed, 10 Apr 2002 13:04:52 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Apr 2002 17:27:35 GMT",
"version": "v2"
},
{
"created": "Thu, 15 May 2008 17:11:40 GMT",
"version": "v3"
}
] |
2008-05-15
|
[
[
"Krzywicki",
"A.",
""
]
] |
We try to explain the apparently "thermal" shape of the inclusive transverse momentum spectrum. We conjecture that prior to the collision, parton-parton interactions generate a kind of a stochastic process driving the one-particle spectrum within a hadron towards the thermal shape it would have in a classical gas. We illustrate this idea, which might have a more general relevance, with a simple, exactly solvable model.
|
1909.11685
|
Chang Sub Shin
|
Kiwoon Choi, Chang Sub Shin, Seokhoon Yun
|
Axion scales and couplings with St\"uckelberg mixing
|
28 pages, 2 figures, v2: references added, accepted for publication
in JHEP
| null | null | null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the axion field range and low energy couplings in models with
St\"uckelberg mixing between axions and $U(1)$ gauge bosons. It is noted that
the gauge-invariant axion combination $\xi$ in the model is periodic $modulo$
an appropriate shift of gauge-variant axions eaten by the massive $U(1)$ gauge
bosons, which in some cases makes the connection between the field range and
the low energy couplings less transparent. We derive the field range of $\xi$
for generic forms of the axion kinetic metric and $U(1)$ charges, and identify
the field basis for which all non-derivative couplings of $\xi$ are quantized
in a manner manifestly consistent with the periodicity of $\xi$. Generically
St\"uckelberg mixing reduces the axion field range. In particular, the mixings
between $N$ axions and $(N-1)$ $U(1)$ gauge bosons typically result in an
exponentially reduced field range $M_\xi ={\cal O}\left({k^{-(N-1)}
f}/{\sqrt{N!}}\right)$ for the residual gauge-invariant axion $\xi$ in the
limit $N\gg 1$, where $f$ and $k$ denote the typical decay constant and the
root mean square of the $U(1)$ gauge charges of the original $N$ axions. Using
simple examples, we study also the reparameterization-invariant physical
quantities such as the axion effective potential and 1PI couplings to gauge
bosons, which are determined by the reparameterization-dependent axion
couplings in the model.
|
[
{
"created": "Wed, 25 Sep 2019 18:04:43 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Nov 2019 02:27:58 GMT",
"version": "v2"
}
] |
2019-11-21
|
[
[
"Choi",
"Kiwoon",
""
],
[
"Shin",
"Chang Sub",
""
],
[
"Yun",
"Seokhoon",
""
]
] |
We study the axion field range and low energy couplings in models with St\"uckelberg mixing between axions and $U(1)$ gauge bosons. It is noted that the gauge-invariant axion combination $\xi$ in the model is periodic $modulo$ an appropriate shift of gauge-variant axions eaten by the massive $U(1)$ gauge bosons, which in some cases makes the connection between the field range and the low energy couplings less transparent. We derive the field range of $\xi$ for generic forms of the axion kinetic metric and $U(1)$ charges, and identify the field basis for which all non-derivative couplings of $\xi$ are quantized in a manner manifestly consistent with the periodicity of $\xi$. Generically St\"uckelberg mixing reduces the axion field range. In particular, the mixings between $N$ axions and $(N-1)$ $U(1)$ gauge bosons typically result in an exponentially reduced field range $M_\xi ={\cal O}\left({k^{-(N-1)} f}/{\sqrt{N!}}\right)$ for the residual gauge-invariant axion $\xi$ in the limit $N\gg 1$, where $f$ and $k$ denote the typical decay constant and the root mean square of the $U(1)$ gauge charges of the original $N$ axions. Using simple examples, we study also the reparameterization-invariant physical quantities such as the axion effective potential and 1PI couplings to gauge bosons, which are determined by the reparameterization-dependent axion couplings in the model.
|
hep-ph/9606336
|
Gg160
|
Gottfried Holzwarth (Universitaet-GH-Siegen)
|
Electro-Magnetic Nucleon Form Factors and their Spectral Functions in
Soliton Models
|
24 pages, (RevTeX), 5 PS-figures; Data points in fig.2 and
corresponding references added. Final version, to be published in Z.Physik A
|
Z.Phys. A356 (1996) 339-350
|
10.1007/s002180050187
|
SI-TH-96-3
|
hep-ph
| null |
It is demonstrated that in simple soliton models essential features of the
electro-magnetic nucleon form factors observed over three orders of magnitude
in momentum transfer $t$ are naturally reproduced. The analysis shows that
three basic ingredients are required: an extended object, partial coupling to
vector mesons, and relativistic recoil corrections. We use for the extended
object the standard skyrmion, one vector meson propagator for both isospin
channels, and the relativistic boost to the Breit frame. Continuation to
timelike $t$ leads to quite stable results for the spectral functions in the
regime from the 2- or 3-pion threshold to about two rho masses. Especially the
onset of the continuous part of the spectral functions at threshold can be
reliably determined and there are strong analogies to the results imposed on
dispersion theoretic approaches by the unitarity constraint.
|
[
{
"created": "Fri, 14 Jun 1996 18:20:40 GMT",
"version": "v1"
},
{
"created": "Sat, 27 Jul 1996 10:26:13 GMT",
"version": "v2"
}
] |
2015-06-25
|
[
[
"Holzwarth",
"Gottfried",
"",
"Universitaet-GH-Siegen"
]
] |
It is demonstrated that in simple soliton models essential features of the electro-magnetic nucleon form factors observed over three orders of magnitude in momentum transfer $t$ are naturally reproduced. The analysis shows that three basic ingredients are required: an extended object, partial coupling to vector mesons, and relativistic recoil corrections. We use for the extended object the standard skyrmion, one vector meson propagator for both isospin channels, and the relativistic boost to the Breit frame. Continuation to timelike $t$ leads to quite stable results for the spectral functions in the regime from the 2- or 3-pion threshold to about two rho masses. Especially the onset of the continuous part of the spectral functions at threshold can be reliably determined and there are strong analogies to the results imposed on dispersion theoretic approaches by the unitarity constraint.
|
1004.3724
|
Anupam Mazumdar
|
Kari Enqvist, Anupam Mazumdar and Philip Stephens
|
Inflection point inflation within supersymmetry
|
6 pages, 1 figure
|
JCAP 1006:020,2010
|
10.1088/1475-7516/2010/06/020
| null |
hep-ph astro-ph.CO hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We propose to address the fine tuning problem of inflection point inflation
by the addition of extra vacuum energy that is present during inflation but
disappears afterwards. We show that in such a case, the required amount of fine
tuning is greatly reduced. We suggest that the extra vacuum energy can be
associated with an earlier phase transition and provide a simple model, based
on extending the SM gauge group to SU(3)_C \times SU(2)_L\times U(1)_Y\times
U(1)_{B-L}, where the Higgs field of U(1)_{B-L} is in a false vacuum during
inflation. In this case, there is virtually no fine tuning of the soft SUSY
breaking parameters of the flat direction which serves as the inflaton.
However, the absence of radiative corrections which would spoil the flatness of
the inflaton potential requires that the U(1)_{B-L} gauge coupling should be
small with g_{B-L}\leq 10^{-4}.
|
[
{
"created": "Wed, 21 Apr 2010 15:16:44 GMT",
"version": "v1"
}
] |
2014-11-20
|
[
[
"Enqvist",
"Kari",
""
],
[
"Mazumdar",
"Anupam",
""
],
[
"Stephens",
"Philip",
""
]
] |
We propose to address the fine tuning problem of inflection point inflation by the addition of extra vacuum energy that is present during inflation but disappears afterwards. We show that in such a case, the required amount of fine tuning is greatly reduced. We suggest that the extra vacuum energy can be associated with an earlier phase transition and provide a simple model, based on extending the SM gauge group to SU(3)_C \times SU(2)_L\times U(1)_Y\times U(1)_{B-L}, where the Higgs field of U(1)_{B-L} is in a false vacuum during inflation. In this case, there is virtually no fine tuning of the soft SUSY breaking parameters of the flat direction which serves as the inflaton. However, the absence of radiative corrections which would spoil the flatness of the inflaton potential requires that the U(1)_{B-L} gauge coupling should be small with g_{B-L}\leq 10^{-4}.
|
hep-ph/9805263
| null |
Y. S. Kim
|
Covariant Model of Relativistic Extended Particles based on the
Oscillator Representation of the Poincar\'e Group
|
RevTeX, 20 pages, 2 psfigs, contribution to the Volume dedicated to
Prof. T.Y.Wu on his 90th Birthday (to be published by World Scientific,
Singapore)
| null |
10.1142/9789812816566_0019
| null |
hep-ph hep-th math-ph math.MP nucl-th quant-ph
| null |
While internal space-time symmetries of relativistic particles are dictated
by the little groups of the Poincar\'e group, it is possible to construct
representations of the little group for massive particles starting from
harmonic oscillator wave functions for the quark model. The resulting
oscillator wave functions are covariant and can be Lorentz-boosted. It is thus
possible to obtain the parton model by boosting the quark model. A review of
Wigner's theory of the little groups is given. It is shown that the covariant
oscillator wave functions become squeezed as as the system becomes boosted. It
is shown also that the Lorentz-squeezed quark distribution exhibits the
peculiarities of Feynman's parton model including the lack of coherence in the
calculation of cross sections. A historical review of the concept of covariance
is given.
|
[
{
"created": "Fri, 8 May 1998 16:09:45 GMT",
"version": "v1"
}
] |
2016-11-03
|
[
[
"Kim",
"Y. S.",
""
]
] |
While internal space-time symmetries of relativistic particles are dictated by the little groups of the Poincar\'e group, it is possible to construct representations of the little group for massive particles starting from harmonic oscillator wave functions for the quark model. The resulting oscillator wave functions are covariant and can be Lorentz-boosted. It is thus possible to obtain the parton model by boosting the quark model. A review of Wigner's theory of the little groups is given. It is shown that the covariant oscillator wave functions become squeezed as as the system becomes boosted. It is shown also that the Lorentz-squeezed quark distribution exhibits the peculiarities of Feynman's parton model including the lack of coherence in the calculation of cross sections. A historical review of the concept of covariance is given.
|
1508.07688
|
Shinya Matsuzaki
|
Shinya Matsuzaki and Koichi Yamawaki
|
Walking on the Ladder: 125 GeV Technidilaton, or Conformal Higgs
-Dedicated to the late Professor Yoichiro Nambu-
|
revtex4, 36 pages, 7 eps figures, some corrections made, references
added; a version to appear in JHEP; typo corrected
| null |
10.1007/JHEP12(2015)053
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The walking technicolor based on the ladder Schwinger-Dyson gap equation is
studied, with the scale-invariant coupling being an idealization of the
Caswell-Banks-Zaks infrared fixed point in the "anti-Veneziano limit", such
that $N_C \rightarrow \infty$ with $N_C \cdot \alpha(\mu^2)=$ fixed and
$N_F/N_C=$ fixed ($\gg 1$), of the $SU(N_C)$ gauge theory with massless $N_F$
flavors near criticality. We show that the 125 GeV Higgs can be naturally
identified with the technidilaton (TD) predicted in the walking technicolor, a
pseudo Nambu-Goldstone (NG) boson of the spontaneous symmetry breaking of the
approximate scale symmetry. Ladder calculations yield the TD mass $M_\phi$ from
the trace anomaly as $M_\phi^2 F_\phi^2= -4 \langle \theta_\mu^\mu \rangle = -
\frac{\beta(\alpha (\mu^2))}{\alpha(\mu^2)}\, \langle G_{\lambda
\nu}^2(\mu^2)\rangle \simeq N_C N_F\frac{16}{\pi^4} m_F^4$, independently of
the renormalization point $\mu$, where $m_F$ is the dynamical mass of the
technifermion, and $F_\phi={\cal O} (\sqrt{N_F N_C}\, m_F)$ the TD decay
constant. It reads $M_\phi^2\simeq (\frac{v_{\rm EW}}{2} \cdot \frac{5 v_{\rm
EW}}{F_\phi})^2 \cdot [\frac{8}{N_F}\frac{4}{N_C}]$, ($v_{\rm EW}=246$ GeV),
which implies $F_\phi\simeq 5 \,v_{\rm EW} $ for $M_\phi \simeq 125\, {\rm
GeV}\simeq \frac{1}{2} v_{\rm EW}$ in the one-family model ($N_C=4, N_F=8$), in
good agreement with the current LHC Higgs data. The result reflects a generic
scaling $ M_\phi^2/v_{\rm EW}^2\sim M_\phi^2/F_\phi^2 \sim m_F^2 /F_\phi^2 \sim
1/(N_F N_C) \rightarrow 0 $ as a vanishing trace anomaly, namely the TD has a
mass vanishing in the anti-Veneziano limit, similarly to $\eta^\prime$ meson as
a pseudo-NG boson of the ordinary QCD with vanishing $U(1)_A$ anomaly in the
Veneziano limit ($N_F/N_C \ll 1$).
|
[
{
"created": "Mon, 31 Aug 2015 04:53:15 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Sep 2015 05:38:51 GMT",
"version": "v2"
},
{
"created": "Tue, 8 Dec 2015 11:58:19 GMT",
"version": "v3"
},
{
"created": "Fri, 11 Nov 2016 14:03:08 GMT",
"version": "v4"
},
{
"created": "Mon, 14 Nov 2016 08:13:08 GMT",
"version": "v5"
}
] |
2016-11-15
|
[
[
"Matsuzaki",
"Shinya",
""
],
[
"Yamawaki",
"Koichi",
""
]
] |
The walking technicolor based on the ladder Schwinger-Dyson gap equation is studied, with the scale-invariant coupling being an idealization of the Caswell-Banks-Zaks infrared fixed point in the "anti-Veneziano limit", such that $N_C \rightarrow \infty$ with $N_C \cdot \alpha(\mu^2)=$ fixed and $N_F/N_C=$ fixed ($\gg 1$), of the $SU(N_C)$ gauge theory with massless $N_F$ flavors near criticality. We show that the 125 GeV Higgs can be naturally identified with the technidilaton (TD) predicted in the walking technicolor, a pseudo Nambu-Goldstone (NG) boson of the spontaneous symmetry breaking of the approximate scale symmetry. Ladder calculations yield the TD mass $M_\phi$ from the trace anomaly as $M_\phi^2 F_\phi^2= -4 \langle \theta_\mu^\mu \rangle = - \frac{\beta(\alpha (\mu^2))}{\alpha(\mu^2)}\, \langle G_{\lambda \nu}^2(\mu^2)\rangle \simeq N_C N_F\frac{16}{\pi^4} m_F^4$, independently of the renormalization point $\mu$, where $m_F$ is the dynamical mass of the technifermion, and $F_\phi={\cal O} (\sqrt{N_F N_C}\, m_F)$ the TD decay constant. It reads $M_\phi^2\simeq (\frac{v_{\rm EW}}{2} \cdot \frac{5 v_{\rm EW}}{F_\phi})^2 \cdot [\frac{8}{N_F}\frac{4}{N_C}]$, ($v_{\rm EW}=246$ GeV), which implies $F_\phi\simeq 5 \,v_{\rm EW} $ for $M_\phi \simeq 125\, {\rm GeV}\simeq \frac{1}{2} v_{\rm EW}$ in the one-family model ($N_C=4, N_F=8$), in good agreement with the current LHC Higgs data. The result reflects a generic scaling $ M_\phi^2/v_{\rm EW}^2\sim M_\phi^2/F_\phi^2 \sim m_F^2 /F_\phi^2 \sim 1/(N_F N_C) \rightarrow 0 $ as a vanishing trace anomaly, namely the TD has a mass vanishing in the anti-Veneziano limit, similarly to $\eta^\prime$ meson as a pseudo-NG boson of the ordinary QCD with vanishing $U(1)_A$ anomaly in the Veneziano limit ($N_F/N_C \ll 1$).
|
hep-ph/0012051
|
Bing An Li
|
Bing An Li (Univ. of Kentucky)
|
Prediction of three heavy spin-0 particles in the SM
|
33 pages
| null | null | null |
hep-ph
| null |
The axial-vector couplings of the internediate bosons with fermions lead to
the prediction of three very heavy spin-0 states in the SM, whose masses are
about 10^{14}GeV. If these states on mass shell there are problems of negative
probability. A new perturbation theory of the SM is proposed.
|
[
{
"created": "Tue, 5 Dec 2000 15:38:46 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Dec 2000 14:18:33 GMT",
"version": "v2"
},
{
"created": "Thu, 21 Dec 2000 14:56:14 GMT",
"version": "v3"
}
] |
2007-05-23
|
[
[
"Li",
"Bing An",
"",
"Univ. of Kentucky"
]
] |
The axial-vector couplings of the internediate bosons with fermions lead to the prediction of three very heavy spin-0 states in the SM, whose masses are about 10^{14}GeV. If these states on mass shell there are problems of negative probability. A new perturbation theory of the SM is proposed.
|
1112.0997
|
Michal Praszalowicz
|
Michal Praszalowicz
|
New look at geometrical scaling
|
6 pages, 1 figure. Based on the talk presented at "Low x Meeting",
Santiago de Compostela, Spain, June 3-7, 2011
| null | null | null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this note we discuss emergence of geometrical scaling (firstly proposed
for deep inelastic collisions) in pp scattering at the LHC and in heavy ion
collisions at RHIC. After discussing general properties of geometrical scaling
(GS) we focus on simple signatures of GS, namely on ratios of the $p_{\rm T}$
values at which multiplicity spectra for different energies are equal.
|
[
{
"created": "Mon, 5 Dec 2011 17:01:44 GMT",
"version": "v1"
}
] |
2011-12-06
|
[
[
"Praszalowicz",
"Michal",
""
]
] |
In this note we discuss emergence of geometrical scaling (firstly proposed for deep inelastic collisions) in pp scattering at the LHC and in heavy ion collisions at RHIC. After discussing general properties of geometrical scaling (GS) we focus on simple signatures of GS, namely on ratios of the $p_{\rm T}$ values at which multiplicity spectra for different energies are equal.
|
1203.5788
|
Christoph Englert
|
Christoph Englert, Michael Spannowsky, Michihisa Takeuchi
|
Measuring Higgs CP and couplings with hadronic event shapes
|
13 pages, 10 figures, 1 table; version published in JHEP
| null |
10.1007/JHEP06(2012)108
|
IPPP/12/19; DCPT/12/38
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Experimental falsification or validation of the Standard Model of Particle
Physics involves the measurement of the CP quantum number and couplings of the
Higgs boson. Both ATLAS and CMS have reported an SM Higgs-like excess around
m_H=125 GeV. In this mass range the properties of the Higgs boson can be
extracted from an analysis of the azimuthal angle distribution of the two jets
in pp->Hjj events. This channel is also important to measure the couplings of
the Higgs boson to electroweak gauge bosons and fermions, hereby establishing
the exceptional role of the Higgs boson in the Standard Model. Instead of
exploiting the jet angular correlation, we show that hadronic event shapes
exhibit substantial discriminative power to separate a CP even from a CP odd
Higgs. Some event shapes even show an increased sensitivity to the Higgs CP
compared to the azimuthal angle correlation. Constraining the Higgs couplings
via a separation of the weak boson fusion and the gluon fusion Higgs production
modes can be achieved applying similar strategies.
|
[
{
"created": "Mon, 26 Mar 2012 20:00:03 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Jun 2012 13:21:28 GMT",
"version": "v2"
}
] |
2015-06-04
|
[
[
"Englert",
"Christoph",
""
],
[
"Spannowsky",
"Michael",
""
],
[
"Takeuchi",
"Michihisa",
""
]
] |
Experimental falsification or validation of the Standard Model of Particle Physics involves the measurement of the CP quantum number and couplings of the Higgs boson. Both ATLAS and CMS have reported an SM Higgs-like excess around m_H=125 GeV. In this mass range the properties of the Higgs boson can be extracted from an analysis of the azimuthal angle distribution of the two jets in pp->Hjj events. This channel is also important to measure the couplings of the Higgs boson to electroweak gauge bosons and fermions, hereby establishing the exceptional role of the Higgs boson in the Standard Model. Instead of exploiting the jet angular correlation, we show that hadronic event shapes exhibit substantial discriminative power to separate a CP even from a CP odd Higgs. Some event shapes even show an increased sensitivity to the Higgs CP compared to the azimuthal angle correlation. Constraining the Higgs couplings via a separation of the weak boson fusion and the gluon fusion Higgs production modes can be achieved applying similar strategies.
|
1106.6087
|
Chan Beom Park
|
Chan Beom Park
|
Reconstructing the heavy resonance at hadron colliders
|
20 pages, 6 figures, 1 table; Version accepted for publication in PRD
|
Phys.Rev.D84:096001,2011
|
10.1103/PhysRevD.84.096001
|
IFT UAM/CSIC-11-46
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the method for constructing the invariant mass using the
M_T2-assisted on-shell (MAOS) approximation to the invisible particle momenta
in the cascade decays of a new particle resonance produced at hadron colliders.
We note that the MAOS reconstruction can be defined in several different ways,
while keeping the efficiency of approximation at a similar level, and one of
them provides a unique solution for each event. It is shown that the invariant
mass distribution constructed with the MAOS momenta exhibits a peak at the
heavy resonance mass, regardless of the chosen MAOS scheme and the detailed
mass spectrum of the particles in the cascade. We stress that the MAOS
invariant mass can be used as a clean signal of new particle resonance produced
at the LHC, as well as a model-independent method to measure the masses of new
particles involved in the event.
|
[
{
"created": "Thu, 30 Jun 2011 00:03:13 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Nov 2011 20:17:17 GMT",
"version": "v2"
}
] |
2011-11-08
|
[
[
"Park",
"Chan Beom",
""
]
] |
We investigate the method for constructing the invariant mass using the M_T2-assisted on-shell (MAOS) approximation to the invisible particle momenta in the cascade decays of a new particle resonance produced at hadron colliders. We note that the MAOS reconstruction can be defined in several different ways, while keeping the efficiency of approximation at a similar level, and one of them provides a unique solution for each event. It is shown that the invariant mass distribution constructed with the MAOS momenta exhibits a peak at the heavy resonance mass, regardless of the chosen MAOS scheme and the detailed mass spectrum of the particles in the cascade. We stress that the MAOS invariant mass can be used as a clean signal of new particle resonance produced at the LHC, as well as a model-independent method to measure the masses of new particles involved in the event.
|
0906.3681
|
Ki-Young Choi
|
Ki-Young Choi, Daniel E.Lopez-Fogliani, Carlos Munoz, Roberto Ruiz de
Austri
|
Gamma-ray detection from gravitino dark matter decay in the $\mu\nu$SSM
|
Final version to appear in JCAP, 13 pages, 3 figures
| null |
10.1088/1475-7516/2010/03/028
|
FTUAM 09/15, IFT-UAM/CSIC-09-29
|
hep-ph astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The $\mu\nu$SSM provides a solution to the $\mu$-problem of the MSSM and
explains the origin of neutrino masses by simply using right-handed neutrino
superfields. Given that R-parity is broken in this model, the gravitino is a
natural candidate for dark matter since its lifetime becomes much longer than
the age of the Universe. We consider the implications of gravitino dark matter
in the $\mu\nu$SSM, analyzing in particular the prospects for detecting gamma
rays from decaying gravitinos. If the gravitino explains the whole dark matter
component, a gravitino mass larger than 20 GeV is disfavored by the isotropic
diffuse photon background measurements. On the other hand, a gravitino with a
mass range between 0.1-20 GeV gives rise to a signal that might be observed by
the FERMI satellite. In this way important regions of the parameter space of
the $\mu\nu$SSM can be checked.
|
[
{
"created": "Fri, 19 Jun 2009 14:28:39 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Sep 2009 16:02:54 GMT",
"version": "v2"
},
{
"created": "Thu, 25 Feb 2010 19:03:04 GMT",
"version": "v3"
}
] |
2015-05-13
|
[
[
"Choi",
"Ki-Young",
""
],
[
"Lopez-Fogliani",
"Daniel E.",
""
],
[
"Munoz",
"Carlos",
""
],
[
"de Austri",
"Roberto Ruiz",
""
]
] |
The $\mu\nu$SSM provides a solution to the $\mu$-problem of the MSSM and explains the origin of neutrino masses by simply using right-handed neutrino superfields. Given that R-parity is broken in this model, the gravitino is a natural candidate for dark matter since its lifetime becomes much longer than the age of the Universe. We consider the implications of gravitino dark matter in the $\mu\nu$SSM, analyzing in particular the prospects for detecting gamma rays from decaying gravitinos. If the gravitino explains the whole dark matter component, a gravitino mass larger than 20 GeV is disfavored by the isotropic diffuse photon background measurements. On the other hand, a gravitino with a mass range between 0.1-20 GeV gives rise to a signal that might be observed by the FERMI satellite. In this way important regions of the parameter space of the $\mu\nu$SSM can be checked.
|
hep-ph/0312194
|
Matteo Cacciari
|
Matteo Cacciari
|
Heavy Quark Production: Theory vs. Experiment
|
6 pages, LaTeX, Talk given at the Workshop on High Energy Physics
IFAE 2003, Lecce, Italy, 23-26 April 2003
|
UPRF-2003-30, LPTHE-P03-24
| null | null |
hep-ph
| null |
The current status of the comparisons between some experimental results and
theoretical predictions for heavy quark production is reviewed. It is shown
that the combination of new theoretical tools and better experimental input
allows for a good description of charm, bottom and top hadroproduction, with no
significant discrepancies between theory and experiment. Theoretical progress
in the resummation of large logarithms and inclusion of power corrections for
the heavy quark fragmentation function is also discussed.
|
[
{
"created": "Mon, 15 Dec 2003 19:46:42 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Cacciari",
"Matteo",
""
]
] |
The current status of the comparisons between some experimental results and theoretical predictions for heavy quark production is reviewed. It is shown that the combination of new theoretical tools and better experimental input allows for a good description of charm, bottom and top hadroproduction, with no significant discrepancies between theory and experiment. Theoretical progress in the resummation of large logarithms and inclusion of power corrections for the heavy quark fragmentation function is also discussed.
|
1412.1003
|
Monika Blanke
|
Monika Blanke
|
Flavour Physics Beyond the Standard Model: Recent Developments and
Future Perspectives
|
presented at the 8th International Workshop on the CKM Unitarity
Triangle (CKM 2014), Vienna, Austria, September 8-12, 2014
| null | null |
CERN-PH-TH-2014-240, TTP14-033
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Flavour physics plays a crucial role in the search for physics beyond the
Standard Model (SM). While $B$ physics offers many observables to look for
deviations from the SM, the highest new physics sensitivity can be obtained in
the rare kaon decays $K\to\pi\nu\bar\nu$. Of particular interest are
correlations between various flavour violating observables that allow to test
the symmetries and the operator structure of the new physics flavour sector.
New physics searches in rare meson decays are complemented by searches for new
flavour violating interactions in the production and decay of new particles at
the LHC and in dark matter phenomenology.
|
[
{
"created": "Tue, 2 Dec 2014 18:18:04 GMT",
"version": "v1"
}
] |
2014-12-03
|
[
[
"Blanke",
"Monika",
""
]
] |
Flavour physics plays a crucial role in the search for physics beyond the Standard Model (SM). While $B$ physics offers many observables to look for deviations from the SM, the highest new physics sensitivity can be obtained in the rare kaon decays $K\to\pi\nu\bar\nu$. Of particular interest are correlations between various flavour violating observables that allow to test the symmetries and the operator structure of the new physics flavour sector. New physics searches in rare meson decays are complemented by searches for new flavour violating interactions in the production and decay of new particles at the LHC and in dark matter phenomenology.
|
1309.0012
|
Tomoya Hayata
|
Tomoya Hayata, Yoshimasa Hidaka, and Arata Yamamoto
|
Temporal Chiral Spiral in Strong Magnetic Fields
|
27pages, 5 figures; v2 - published version
|
Phys. Rev. D 89, 085011 (2014)
|
10.1103/PhysRevD.89.085011
|
RIKEN-QHP-92
|
hep-ph cond-mat.str-el hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Vacuum properties of quantum chromodynamics in strong magnetic and finite
electric fields are investigated. We show that when a uniform electric field is
instantaneously applied in the parallel direction to a strong magnetic field,
it induces temporal oscillation of the chiral and pion condensates. This is a
temporal analog to the chiral spiral. The oscillation originates with the
propagation of the collective mode, which is protected by the axial anomaly and
thus nondissipative.
|
[
{
"created": "Fri, 30 Aug 2013 20:00:39 GMT",
"version": "v1"
},
{
"created": "Mon, 31 Mar 2014 05:35:28 GMT",
"version": "v2"
}
] |
2014-04-23
|
[
[
"Hayata",
"Tomoya",
""
],
[
"Hidaka",
"Yoshimasa",
""
],
[
"Yamamoto",
"Arata",
""
]
] |
Vacuum properties of quantum chromodynamics in strong magnetic and finite electric fields are investigated. We show that when a uniform electric field is instantaneously applied in the parallel direction to a strong magnetic field, it induces temporal oscillation of the chiral and pion condensates. This is a temporal analog to the chiral spiral. The oscillation originates with the propagation of the collective mode, which is protected by the axial anomaly and thus nondissipative.
|
hep-ph/9304301
|
Per Osland
|
G\"oran F\"aldt and Per Osland
|
Decorated-box-diagram-contributions to Bhabha scattering. (II)
|
10 pages + 1 PostScript figure appended, plain TEX, with private
macros (attached) Bergen Scientific/Technical Report No. 1993-05
|
Nucl.Phys. B413 (1994) 64-72
|
10.1016/0550-3213(94)90613-0
| null |
hep-ph
| null |
We evaluate, in the high-energy limit, $s\gg|t|\gg m^2\gg\lambda^2$, the sum
of amplitudes corresponding to a class of Feynman diagrams describing two-loop
virtual photonic corrections to Bhabha scattering. The diagrams considered are
box and crossed box diagrams with a vacuum polarization insertion in one of the
photon lines.
|
[
{
"created": "Tue, 27 Apr 1993 06:49:41 GMT",
"version": "v1"
}
] |
2009-10-22
|
[
[
"Fäldt",
"Göran",
""
],
[
"Osland",
"Per",
""
]
] |
We evaluate, in the high-energy limit, $s\gg|t|\gg m^2\gg\lambda^2$, the sum of amplitudes corresponding to a class of Feynman diagrams describing two-loop virtual photonic corrections to Bhabha scattering. The diagrams considered are box and crossed box diagrams with a vacuum polarization insertion in one of the photon lines.
|
1011.3086
|
Sadataka Furui
|
Sadataka Furui
|
Domain Wall Fermion Lattice Simulation in Quaternion Basis
|
3 pages, 6 figures, QCHS-09(Madrid, August 30-Sept 3, 2010)
proceedings
|
AIP Conf.Proc.1343:533-535,2011
|
10.1063/1.3575085
| null |
hep-ph hep-lat
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In the QCD analysis, when quarks are expressed in quaternion basis, the quark
and its charge conjugate together are expressed by octonions and the octonion
posesses the triality symmetry. Gluos are expressed by Pl\"ucker coordinates of
spinors. Roles of triality in the proton charge form factor, three loop gluon
self energy, technicolor, fine tuning and unparticle physics are discussed.
|
[
{
"created": "Sat, 13 Nov 2010 01:41:34 GMT",
"version": "v1"
}
] |
2011-06-15
|
[
[
"Furui",
"Sadataka",
""
]
] |
In the QCD analysis, when quarks are expressed in quaternion basis, the quark and its charge conjugate together are expressed by octonions and the octonion posesses the triality symmetry. Gluos are expressed by Pl\"ucker coordinates of spinors. Roles of triality in the proton charge form factor, three loop gluon self energy, technicolor, fine tuning and unparticle physics are discussed.
|
hep-ph/0305035
|
George Rupp
|
Eef van Beveren and George Rupp
|
Observed D_s(2317) and tentative D(2100-2300) as the charmed cousins of
the light scalar nonet
|
6 pages, 2 figures included, plain LaTeX; PACS numbers 14.40.Lb,
13.25.Ft, 13.75.Lb, 12.40.Yx; v2: changes in text and title; v3: one
reference added, one PACS number changed. Accepted for publication in
Physical Review Letters
|
Phys.Rev.Lett.91:012003,2003
|
10.1103/PhysRevLett.91.012003
| null |
hep-ph
| null |
The very recently observed D^*_{sJ}(2317)^+ meson is described as a
quasi-bound scalar c\bar{s} state in a unitarized meson model, owing its
existence to the strong ^3P_0 OZI-allowed coupling to the nearby S-wave DK
threshold. By the same mechanism, a scalar D_0(2100-2300) resonance is
predicted slightly above the D\pi threshold. These scalars are the charmed
cousins of the light scalar nonet f_0(600), f_0(980), K^*_0(800), and a_0(980),
reproduced by the same model. The standard c\bar{n} and c\bar{s} charmed
scalars D_{0} and D_{s0}, cousins of the scalar nonet f_0(1370), f_0(1500),
K_0^*(1430), and a_0(1450), are predicted to lie at about 2.64 and 2.79 GeV,
respectively, both with a width of some 200 MeV.
|
[
{
"created": "Mon, 5 May 2003 08:24:54 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Jun 2003 11:49:05 GMT",
"version": "v2"
},
{
"created": "Mon, 16 Jun 2003 10:24:27 GMT",
"version": "v3"
},
{
"created": "Mon, 30 Jun 2003 09:56:20 GMT",
"version": "v4"
}
] |
2008-11-26
|
[
[
"van Beveren",
"Eef",
""
],
[
"Rupp",
"George",
""
]
] |
The very recently observed D^*_{sJ}(2317)^+ meson is described as a quasi-bound scalar c\bar{s} state in a unitarized meson model, owing its existence to the strong ^3P_0 OZI-allowed coupling to the nearby S-wave DK threshold. By the same mechanism, a scalar D_0(2100-2300) resonance is predicted slightly above the D\pi threshold. These scalars are the charmed cousins of the light scalar nonet f_0(600), f_0(980), K^*_0(800), and a_0(980), reproduced by the same model. The standard c\bar{n} and c\bar{s} charmed scalars D_{0} and D_{s0}, cousins of the scalar nonet f_0(1370), f_0(1500), K_0^*(1430), and a_0(1450), are predicted to lie at about 2.64 and 2.79 GeV, respectively, both with a width of some 200 MeV.
|
1105.5988
|
Akin Wingerter
|
Akin Wingerter
|
A Fourth Chiral Generation And Susy Breaking
|
Contribution to the proceedings of "Les Rencontres de Moriond EW
2011" based on arXiv:0911.1882
| null | null |
LPSC-11111
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We revisit four generations within the context of supersymmetry. We compute
the perturbativity limits for the fourth generation Yukawa couplings and show
that if the masses of the fourth generation lie within reasonable limits of
their present experimental lower bounds, it is possible to have perturbativity
only up to scales around 1000 TeV, i.e. the current experimental bounds and
perturbative unification are mutually exclusive. Such low scales are ideally
suited to incorporate gauge mediated supersymmetry breaking, where the
mediation scale can be as low as 10-20 TeV. The minimal messenger model,
however, is highly constrained. Lack of electroweak symmetry breaking rules out
a large part of the parameter space, and in the remaining part, the fourth
generation stau is tachyonic.
|
[
{
"created": "Mon, 30 May 2011 13:26:21 GMT",
"version": "v1"
}
] |
2011-05-31
|
[
[
"Wingerter",
"Akin",
""
]
] |
We revisit four generations within the context of supersymmetry. We compute the perturbativity limits for the fourth generation Yukawa couplings and show that if the masses of the fourth generation lie within reasonable limits of their present experimental lower bounds, it is possible to have perturbativity only up to scales around 1000 TeV, i.e. the current experimental bounds and perturbative unification are mutually exclusive. Such low scales are ideally suited to incorporate gauge mediated supersymmetry breaking, where the mediation scale can be as low as 10-20 TeV. The minimal messenger model, however, is highly constrained. Lack of electroweak symmetry breaking rules out a large part of the parameter space, and in the remaining part, the fourth generation stau is tachyonic.
|
1108.0864
|
Giulia Zanderighi
|
Barbara Jager, Giulia Zanderighi
|
NLO corrections to electroweak and QCD production of W+W+ plus two jets
in the POWHEGBOX
|
16 pages, 9 figures
| null |
10.1007/JHEP11(2011)055
|
MZ-TH/11-20; OUTP-11-45P
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present the matching of the next-to-leading order QCD calculation for
W+W+jj production via vector-boson fusion in hadronic collisions to
parton-shower Monte-Carlo programs according to the POWHEG method. Our
implementation complements existing code for QCD-induced W+W+jj production in
the POWHEGBOX package, thereby providing a platform for the complete Standard
Model production of W+W+jj events via QCD and electroweak interactions. The
impact of parton-shower effects is discussed for various distributions and
found to be small in most cases. However, few observables, that are relevant
for analyses using a central jet veto, are modified significantly when they are
interfaced to a parton shower program.
|
[
{
"created": "Wed, 3 Aug 2011 15:16:46 GMT",
"version": "v1"
},
{
"created": "Thu, 15 Dec 2011 12:52:28 GMT",
"version": "v2"
}
] |
2015-05-30
|
[
[
"Jager",
"Barbara",
""
],
[
"Zanderighi",
"Giulia",
""
]
] |
We present the matching of the next-to-leading order QCD calculation for W+W+jj production via vector-boson fusion in hadronic collisions to parton-shower Monte-Carlo programs according to the POWHEG method. Our implementation complements existing code for QCD-induced W+W+jj production in the POWHEGBOX package, thereby providing a platform for the complete Standard Model production of W+W+jj events via QCD and electroweak interactions. The impact of parton-shower effects is discussed for various distributions and found to be small in most cases. However, few observables, that are relevant for analyses using a central jet veto, are modified significantly when they are interfaced to a parton shower program.
|
2208.14419
|
Xin-Nian Wang
|
Man Xie, Weiyao Ke, Hanzhong Zhang and Xin-Nian Wang
|
Global constraint on the jet transport coefficient from single hadron,
dihadron and $\gamma$-hadron spectra in high-energy heavy-ion collisions
|
32 pages in ReVtex with 32 figures. Version submitted to PRC
| null | null | null |
hep-ph nucl-th
|
http://creativecommons.org/licenses/by/4.0/
|
Modifications of large transverse momentum single hadron, dihadron, and
$\gamma$-hadron spectra in relativistic heavy-ion collisions are direct
consequences of parton-medium interactions in the quark-gluon plasma (QGP). The
interaction strength and underlying dynamics can be quantified by the jet
transport coefficient $\hat{q}$. We carry out the first global constraint on
$\hat{q}$ using a next-to-leading order pQCD parton model with higher-twist
parton energy loss and combining world experimental data on single hadron,
dihadron, and $\gamma$-hadron suppression at both RHIC and LHC energies with a
wide range of centralities. The global Bayesian analysis using the information
field (IF) priors provides the most stringent constraint on $\hat q(T)$. We
demonstrate in particular the progressive constraining power of the IF Bayesian
analysis on the strong temperature dependence of $\hat{q}$ using data from
different centralities and colliding energies. We also discuss the advantage of
using both inclusive and correlation observables with different geometric
biases. As a verification, the obtained $\hat{q}(T)$ is shown to describe data
on single hadron anisotropy at high transverse momentum well. Predictions for
future jet quenching measurements in oxygen-oxygen collisions are also
provided.
|
[
{
"created": "Tue, 30 Aug 2022 17:39:00 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Nov 2023 23:47:35 GMT",
"version": "v2"
}
] |
2023-11-10
|
[
[
"Xie",
"Man",
""
],
[
"Ke",
"Weiyao",
""
],
[
"Zhang",
"Hanzhong",
""
],
[
"Wang",
"Xin-Nian",
""
]
] |
Modifications of large transverse momentum single hadron, dihadron, and $\gamma$-hadron spectra in relativistic heavy-ion collisions are direct consequences of parton-medium interactions in the quark-gluon plasma (QGP). The interaction strength and underlying dynamics can be quantified by the jet transport coefficient $\hat{q}$. We carry out the first global constraint on $\hat{q}$ using a next-to-leading order pQCD parton model with higher-twist parton energy loss and combining world experimental data on single hadron, dihadron, and $\gamma$-hadron suppression at both RHIC and LHC energies with a wide range of centralities. The global Bayesian analysis using the information field (IF) priors provides the most stringent constraint on $\hat q(T)$. We demonstrate in particular the progressive constraining power of the IF Bayesian analysis on the strong temperature dependence of $\hat{q}$ using data from different centralities and colliding energies. We also discuss the advantage of using both inclusive and correlation observables with different geometric biases. As a verification, the obtained $\hat{q}(T)$ is shown to describe data on single hadron anisotropy at high transverse momentum well. Predictions for future jet quenching measurements in oxygen-oxygen collisions are also provided.
|
hep-ph/0303259
|
Barbara Mele
|
Anindya Datta, Emidio Gabrielli, Barbara Mele
|
Large extra dimension effects in Higgs boson production at linear
colliders and Higgs factories
|
16 pages, 2 figures ; a few comments and references added ; version
to appear in JHEP
|
JHEP 10 (2003) 003
|
10.1088/1126-6708/2003/10/003
|
HIP-2003-19/TH, ROME1-1352/2003
|
hep-ph
| null |
In the framework of quantum gravity propagating in large extra dimensions,
the effects of virtual Kaluza-Klein graviton and graviscalar interference with
Higgs boson production amplitudes are computed at linear colliders and Higgs
factories. The interference of the almost-continuous spectrum of the KK
gravitons with the standard model resonant amplitude is finite and predictable
in terms of the fundamental D-dimensional Plank scale M_D and the number of
extra dimensions \delta. We find that, for M_D ~ 1 TeV and \delta=2, effects of
the order of a few percent could be detected for heavy Higgs bosons (m_H>500
GeV) in Higgs production both via WW fusion in e^+e^- colliders and at
\mu^+\mu^- Higgs-boson factories.
|
[
{
"created": "Mon, 31 Mar 2003 09:54:03 GMT",
"version": "v1"
},
{
"created": "Fri, 3 Oct 2003 07:46:35 GMT",
"version": "v2"
}
] |
2013-09-25
|
[
[
"Datta",
"Anindya",
""
],
[
"Gabrielli",
"Emidio",
""
],
[
"Mele",
"Barbara",
""
]
] |
In the framework of quantum gravity propagating in large extra dimensions, the effects of virtual Kaluza-Klein graviton and graviscalar interference with Higgs boson production amplitudes are computed at linear colliders and Higgs factories. The interference of the almost-continuous spectrum of the KK gravitons with the standard model resonant amplitude is finite and predictable in terms of the fundamental D-dimensional Plank scale M_D and the number of extra dimensions \delta. We find that, for M_D ~ 1 TeV and \delta=2, effects of the order of a few percent could be detected for heavy Higgs bosons (m_H>500 GeV) in Higgs production both via WW fusion in e^+e^- colliders and at \mu^+\mu^- Higgs-boson factories.
|
hep-ph/0601192
|
Stefano Frixione
|
S. Frixione, B. R. Webber
|
The MC@NLO 3.2 Event Generator
|
23 pages Latex
| null | null |
CERN-PH-TH/2006-012, Cavendish-HEP-06/03, GEF-TH-1/2006
|
hep-ph
| null |
This is the user's manual of MC@NLO 3.2. This package is a practical
implementation, based upon the HERWIG event generator, of the MC@NLO formalism,
which allows one to incorporate NLO QCD matrix elements consistently into a
parton shower framework. Processes available in this version include the
hadroproduction of single vector and Higgs bosons, vector boson pairs, heavy
quark pairs, single top, lepton pairs, and Higgs bosons in association with a W
or Z. Spin correlations in decays are included for all processes except ttbar,
single-t, ZZ, and WZ production. This document is self-contained, but we
emphasise the main differences with respect to previous versions.
|
[
{
"created": "Mon, 23 Jan 2006 16:06:30 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Frixione",
"S.",
""
],
[
"Webber",
"B. R.",
""
]
] |
This is the user's manual of MC@NLO 3.2. This package is a practical implementation, based upon the HERWIG event generator, of the MC@NLO formalism, which allows one to incorporate NLO QCD matrix elements consistently into a parton shower framework. Processes available in this version include the hadroproduction of single vector and Higgs bosons, vector boson pairs, heavy quark pairs, single top, lepton pairs, and Higgs bosons in association with a W or Z. Spin correlations in decays are included for all processes except ttbar, single-t, ZZ, and WZ production. This document is self-contained, but we emphasise the main differences with respect to previous versions.
|
1406.4586
|
Koichi Hattori
|
Sungtae Cho, Koichi Hattori, Su Houng Lee, Kenji Morita and Sho Ozaki
|
QCD sum rules for magnetically induced mixing between $\eta_c$ and
$J/\psi$
|
5 pages, 2 figures. Some descriptions improved. Published in PRL
|
Phys. Rev. Lett. 113, 172301 (2014)
|
10.1103/PhysRevLett.113.172301
|
KEK-TH-1746, RIKEN-QHP-158
|
hep-ph hep-lat nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the properties of charmonia in strong magnetic fields by using
QCD sum rules. We show how to implement the mixing effects between $\eta_c$ and
$J/\psi$ on the basis of field-theoretical approaches, and then show that the
sum rules are saturated by the mixing effects with phenomenologically
determined parameters. Consequently, we find that the mixing effects are the
dominant contribution to the mass shifts of the charmonia in strong magnetic
fields.
|
[
{
"created": "Wed, 18 Jun 2014 03:42:34 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Oct 2014 17:07:29 GMT",
"version": "v2"
}
] |
2014-10-22
|
[
[
"Cho",
"Sungtae",
""
],
[
"Hattori",
"Koichi",
""
],
[
"Lee",
"Su Houng",
""
],
[
"Morita",
"Kenji",
""
],
[
"Ozaki",
"Sho",
""
]
] |
We investigate the properties of charmonia in strong magnetic fields by using QCD sum rules. We show how to implement the mixing effects between $\eta_c$ and $J/\psi$ on the basis of field-theoretical approaches, and then show that the sum rules are saturated by the mixing effects with phenomenologically determined parameters. Consequently, we find that the mixing effects are the dominant contribution to the mass shifts of the charmonia in strong magnetic fields.
|
1212.6272
|
Wei Chao
|
Wei Chao, Jian-Hui Zhang, Yongchao Zhang
|
Vacuum Stability and Higgs Diphoton Decay Rate in the Zee-Babu Model
|
19 pages, 6 figures
| null |
10.1007/JHEP06(2013)039
|
NPAC-12-22
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Although recent Higgs data from ATLAS and CMS are compatible with a Standard
Model (SM) signal at $2\sigma$ level, both experiments see indications for an
excess in the diphoton decay channel, which points to new physics beyond the
SM. Given such a low Higgs mass $m_H \sim 125 {\rm GeV}$, another sign
indicating the existence of new physics beyond the SM is the vacuum stability
problem, i.e., the SM Higgs quartic coupling may run to negative values at a
scale below the Planck scale. In this paper, we study the vacuum stability and
enhanced Higgs diphoton decay rate in the Zee-Babu model, which was used to
generate tiny Majorana neutrino masses at two-loop level. We find that it is
rather difficult to find overlapping regions allowed by the vacuum stability
and diphoton enhancement constraints. As a consequence, it is almost inevitable
to introduce new ingredients into the model, in order to resolve these two
issues simultaneously.
|
[
{
"created": "Wed, 26 Dec 2012 22:05:39 GMT",
"version": "v1"
}
] |
2015-06-12
|
[
[
"Chao",
"Wei",
""
],
[
"Zhang",
"Jian-Hui",
""
],
[
"Zhang",
"Yongchao",
""
]
] |
Although recent Higgs data from ATLAS and CMS are compatible with a Standard Model (SM) signal at $2\sigma$ level, both experiments see indications for an excess in the diphoton decay channel, which points to new physics beyond the SM. Given such a low Higgs mass $m_H \sim 125 {\rm GeV}$, another sign indicating the existence of new physics beyond the SM is the vacuum stability problem, i.e., the SM Higgs quartic coupling may run to negative values at a scale below the Planck scale. In this paper, we study the vacuum stability and enhanced Higgs diphoton decay rate in the Zee-Babu model, which was used to generate tiny Majorana neutrino masses at two-loop level. We find that it is rather difficult to find overlapping regions allowed by the vacuum stability and diphoton enhancement constraints. As a consequence, it is almost inevitable to introduce new ingredients into the model, in order to resolve these two issues simultaneously.
|
hep-ph/9307363
|
Charles Gale
|
Charles Gale and Peter Lichard
|
Lepton pairs from thermal mesons
|
In ReVTeX 3.0, 9 figs. available from above email address. McGill
93/8, TPI-MINN-93/19-T
|
Phys.Rev. D49 (1994) 3338-3344
|
10.1103/PhysRevD.49.3338
| null |
hep-ph nucl-th
| null |
We study the net dielectron production rates from an ensemble of thermal
mesons, using an effective Lagrangian to model their interaction. The coupling
between the electromagnetic and the hadronic sectors is done through the vector
meson dominance approach. For the first time, a complete set of light mesons is
considered. We include contributions from decays of the type
V~(PS)~$\rightarrow$~PS~(V)~+~$e^+~e^-$, where V is a vector meson and PS is a
pseudoscalar, as well as those from binary reactions PS~+~PS, V~+~V, and
V~+~PS~$\rightarrow~e^+e^-$. Direct decays of the type V~$\rightarrow~e^+ e^-$
are included and shown to be important. We find that the dielectron invariant
mass spectrum naturally divides in distinct regions: in the low mass domain the
decays from vector and pseudoscalar mesons form the dominant contribution. The
pion--pion annihilation and direct decays then pick up and form the leading
signal in an invariant mass region that includes the $\rho - \omega$ complex
and extends up to the $\phi$. Above invariant mass $M\ \approx$~1~GeV other
two-body reactions take over as the prominent mechanisms for lepton pair
generation. These facts will have quantitative bearing on the eventual
identification of the quark--gluon plasma.
|
[
{
"created": "Thu, 29 Jul 1993 13:49:35 GMT",
"version": "v1"
}
] |
2009-10-22
|
[
[
"Gale",
"Charles",
""
],
[
"Lichard",
"Peter",
""
]
] |
We study the net dielectron production rates from an ensemble of thermal mesons, using an effective Lagrangian to model their interaction. The coupling between the electromagnetic and the hadronic sectors is done through the vector meson dominance approach. For the first time, a complete set of light mesons is considered. We include contributions from decays of the type V~(PS)~$\rightarrow$~PS~(V)~+~$e^+~e^-$, where V is a vector meson and PS is a pseudoscalar, as well as those from binary reactions PS~+~PS, V~+~V, and V~+~PS~$\rightarrow~e^+e^-$. Direct decays of the type V~$\rightarrow~e^+ e^-$ are included and shown to be important. We find that the dielectron invariant mass spectrum naturally divides in distinct regions: in the low mass domain the decays from vector and pseudoscalar mesons form the dominant contribution. The pion--pion annihilation and direct decays then pick up and form the leading signal in an invariant mass region that includes the $\rho - \omega$ complex and extends up to the $\phi$. Above invariant mass $M\ \approx$~1~GeV other two-body reactions take over as the prominent mechanisms for lepton pair generation. These facts will have quantitative bearing on the eventual identification of the quark--gluon plasma.
|
hep-ph/0207278
|
Arnd Brandenburg
|
A. Brandenburg, M. Maniatis, M.M. Weber
|
Testing coupling relations in SUSY-QCD at a Linear Collider
|
8 pages, 10 figures. Talk at the 10th International Conference on
Supersymmetry and Unification of Fundamental Interactions (SUSY02), June
17-23, 2002, DESY Hamburg, to appear in the proceedings
| null | null |
DESY 02-097, PSI-PR-02-06
|
hep-ph
| null |
Supersymmetry predicts that gauge couplings are equal to the corresponding
gaugino-sfermion-fermion Yukawa couplings. This prediction can be tested for
the QCD sector of the MSSM by studying the processes eplus+eminus ->
squark+antisquark+gluon and eplus+eminus -> squark+antiquark+gluino at a future
linear collider. We present results for these processes at next-to-leading
order in alpha_s in the framework of the MSSM. We find sizable SUSY-QCD
corrections. The renormalization scale dependence is significantly reduced at
next-to-leading order.
|
[
{
"created": "Tue, 23 Jul 2002 12:36:32 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Brandenburg",
"A.",
""
],
[
"Maniatis",
"M.",
""
],
[
"Weber",
"M. M.",
""
]
] |
Supersymmetry predicts that gauge couplings are equal to the corresponding gaugino-sfermion-fermion Yukawa couplings. This prediction can be tested for the QCD sector of the MSSM by studying the processes eplus+eminus -> squark+antisquark+gluon and eplus+eminus -> squark+antiquark+gluino at a future linear collider. We present results for these processes at next-to-leading order in alpha_s in the framework of the MSSM. We find sizable SUSY-QCD corrections. The renormalization scale dependence is significantly reduced at next-to-leading order.
|
1212.5528
|
Xiao-Gang He
|
Guan-nan Li, Gang Guo, Bo Ren, Ya-Juan Zheng, Xiao-Gang He
|
Lepton number violation and $h\to \gamma\gamma$ in a radiative inverse
seesaw dark matter model
|
RevTex, 16 pages with 8 figures, Several typos corrected
| null |
10.1007/JHEP04(2013)026
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study phenomenological implications of a radiative inverse seesaw dark
matter model. In this model, because neutrino masses are generated at two loop
level with inverse seesaw, the new physics mass scale can be as low as a few
hundred GeV and the model also naturally contain dark matter candidate. The
Yukawa couplings linking the SM leptons and new particles can be large. This
can lead to large lepton flavor violating effects. We find that future
experimental data on $\mu \to e \gamma$ and $\mu - e$ conversion can further
test the model. The new charged particles can affect significantly the $h \to
\gamma \gamma$ branching ratio in the SM. The model is able to explain the
deviation between the SM prediction and the LHC data. We also study some LHC
signatures of the new particles in the model.
|
[
{
"created": "Fri, 21 Dec 2012 17:16:31 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Dec 2012 06:40:35 GMT",
"version": "v2"
},
{
"created": "Wed, 27 Feb 2013 02:14:19 GMT",
"version": "v3"
},
{
"created": "Thu, 14 Mar 2013 01:21:56 GMT",
"version": "v4"
}
] |
2015-06-12
|
[
[
"Li",
"Guan-nan",
""
],
[
"Guo",
"Gang",
""
],
[
"Ren",
"Bo",
""
],
[
"Zheng",
"Ya-Juan",
""
],
[
"He",
"Xiao-Gang",
""
]
] |
We study phenomenological implications of a radiative inverse seesaw dark matter model. In this model, because neutrino masses are generated at two loop level with inverse seesaw, the new physics mass scale can be as low as a few hundred GeV and the model also naturally contain dark matter candidate. The Yukawa couplings linking the SM leptons and new particles can be large. This can lead to large lepton flavor violating effects. We find that future experimental data on $\mu \to e \gamma$ and $\mu - e$ conversion can further test the model. The new charged particles can affect significantly the $h \to \gamma \gamma$ branching ratio in the SM. The model is able to explain the deviation between the SM prediction and the LHC data. We also study some LHC signatures of the new particles in the model.
|
hep-ph/9210202
| null |
S. P. Rosen
|
Double Beta Decay
|
19 pages (two figures not included) report number UTAPHY-HEP-4
| null | null | null |
hep-ph
| null |
I review the subject of double beta decay with emphasis upon its implications
for the neutrino. It is shown that even if right-handed currents provide the
phenomenological mechanism for no-neutrino decay, the fundamental mechanism
underlying the process must be neutrino mass. Estimates of the mass required
suggest that this mechanism is less likely than the direct mechanism of
Majorana mass terms in the mass matrix.
|
[
{
"created": "Thu, 1 Oct 1992 21:28:00 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Rosen",
"S. P.",
""
]
] |
I review the subject of double beta decay with emphasis upon its implications for the neutrino. It is shown that even if right-handed currents provide the phenomenological mechanism for no-neutrino decay, the fundamental mechanism underlying the process must be neutrino mass. Estimates of the mass required suggest that this mechanism is less likely than the direct mechanism of Majorana mass terms in the mass matrix.
|
1304.3182
|
Jinmian Li
|
Taoli Cheng, Jinmian Li, Tianjun Li, Qi-Shu Yan
|
Natural NMSSM confronting with the LHC7-8
|
43 pages, 13 figures
|
Phys. Rev. D 89, 015015 (2014)
|
10.1103/PhysRevD.89.015015
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The natural supersymmetry (SUSY) requires that stop, sbottom, and gluino be
around one TeV or lighter. By using the direct SUSY search bounds from both
ATLAS and CMS Collaborations, we examine the constraints on the natural SUSY in
the Next to Minimal Supersymmetric Standard Model (NMSSM). We consider two
cases of interpretations for the Higgs boson data: (1) the Standard Model (SM)
like Higgs boson is the lightest CP-even Higgs boson; (2) the SM like Higgs
boson is the second lightest CP-even Higgs boson. We find that the direct SUSY
searches at the LHC impose a strong constraint on the light gluino scenarios,
and in both cases the gluino can not be lighter than 1.1 TeV with sbottom mass
up to 600 GeV and stop mass up to 550 GeV.
|
[
{
"created": "Thu, 11 Apr 2013 02:55:15 GMT",
"version": "v1"
}
] |
2014-01-29
|
[
[
"Cheng",
"Taoli",
""
],
[
"Li",
"Jinmian",
""
],
[
"Li",
"Tianjun",
""
],
[
"Yan",
"Qi-Shu",
""
]
] |
The natural supersymmetry (SUSY) requires that stop, sbottom, and gluino be around one TeV or lighter. By using the direct SUSY search bounds from both ATLAS and CMS Collaborations, we examine the constraints on the natural SUSY in the Next to Minimal Supersymmetric Standard Model (NMSSM). We consider two cases of interpretations for the Higgs boson data: (1) the Standard Model (SM) like Higgs boson is the lightest CP-even Higgs boson; (2) the SM like Higgs boson is the second lightest CP-even Higgs boson. We find that the direct SUSY searches at the LHC impose a strong constraint on the light gluino scenarios, and in both cases the gluino can not be lighter than 1.1 TeV with sbottom mass up to 600 GeV and stop mass up to 550 GeV.
|
1705.01397
|
Ismail Zahed
|
Yizhuang Liu and Ismail Zahed
|
Heavy and Strange Holographic Baryons
|
14 pages, 1 figure. arXiv admin note: substantial text overlap with
arXiv:1704.03412
|
Phys. Rev. D 96, 056027 (2017)
|
10.1103/PhysRevD.96.056027
| null |
hep-ph hep-lat hep-th nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We extend the $D4$-$D8$ holographic construction to include three chiral and
one heavy flavor, to describe heavy-light baryons with strangeness and their
exotics. At strong coupling, the heavy meson always binds to the bulk instanton
in the form of a flavor zero mode in the fundamental representation. We
quantize the ensuing bound states using the collective quantization method, to
obtain the spectra of heavy and strange baryons with both explicit and hidden
charm and bottom. Our results confirm the existence of two low-lying charmed
penta-quark states with $\frac 12^-,\frac 32^-$ assignments, and predict many
new ones with both charm and bottom. They also suggest a quartet of low-lying
neutral $\Omega_c^0$ with assignments $\frac 12^\pm ,\frac 32^\pm$ that are
heavier than the quintuplet of neutral $\Omega_c^0$ recently reported by LHCb.
|
[
{
"created": "Wed, 3 May 2017 13:05:43 GMT",
"version": "v1"
}
] |
2017-10-04
|
[
[
"Liu",
"Yizhuang",
""
],
[
"Zahed",
"Ismail",
""
]
] |
We extend the $D4$-$D8$ holographic construction to include three chiral and one heavy flavor, to describe heavy-light baryons with strangeness and their exotics. At strong coupling, the heavy meson always binds to the bulk instanton in the form of a flavor zero mode in the fundamental representation. We quantize the ensuing bound states using the collective quantization method, to obtain the spectra of heavy and strange baryons with both explicit and hidden charm and bottom. Our results confirm the existence of two low-lying charmed penta-quark states with $\frac 12^-,\frac 32^-$ assignments, and predict many new ones with both charm and bottom. They also suggest a quartet of low-lying neutral $\Omega_c^0$ with assignments $\frac 12^\pm ,\frac 32^\pm$ that are heavier than the quintuplet of neutral $\Omega_c^0$ recently reported by LHCb.
|
hep-ph/0207053
|
Werner Rodejohann
|
Werner Rodejohann
|
Leptogenesis, mass hierarchies and low energy parameters
|
14 pages, 4 figures. Reference added
|
Phys.Lett. B542 (2002) 100-110
|
10.1016/S0370-2693(02)02310-9
|
DO-TH 02/09
|
hep-ph
| null |
Leptogenesis in a left-right symmetric model is investigated for all possible
neutrino mass hierarchies. The predictions of the model for low energy
parameters as measured in neutrinoless double beta decay and in oscillation
experiments are compared. The preferred values of the Majorana phases and
limits on the smallest mass state are given. The main observation is that for
the inverse hierarchy observable CP violation in oscillation experiments as
well as a sizable signal in neutrinoless double beta decay can be expected. In
a degenerate scheme, one Majorana phase is bounded to be around pi/2 or pi, and
this ambiguity can easily be tested through neutrinoless double beta decay. The
dependence of the baryon asymmetry on the different "Dirac" and "Majorana"
phases is analyzed and a possibility to avoid the gravitino problem is
discussed.
|
[
{
"created": "Wed, 3 Jul 2002 17:38:09 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Aug 2002 14:04:00 GMT",
"version": "v2"
}
] |
2010-04-05
|
[
[
"Rodejohann",
"Werner",
""
]
] |
Leptogenesis in a left-right symmetric model is investigated for all possible neutrino mass hierarchies. The predictions of the model for low energy parameters as measured in neutrinoless double beta decay and in oscillation experiments are compared. The preferred values of the Majorana phases and limits on the smallest mass state are given. The main observation is that for the inverse hierarchy observable CP violation in oscillation experiments as well as a sizable signal in neutrinoless double beta decay can be expected. In a degenerate scheme, one Majorana phase is bounded to be around pi/2 or pi, and this ambiguity can easily be tested through neutrinoless double beta decay. The dependence of the baryon asymmetry on the different "Dirac" and "Majorana" phases is analyzed and a possibility to avoid the gravitino problem is discussed.
|
hep-ph/0409273
|
Masato Arai
|
Masato Arai, Nobuchika Okada, Karel Smolek, Vladislav Simak
|
Top Spin Correlations in Theories with Large Extra-Dimensions at the
Large Hadron Collider
|
18 pages, 16 figures, a few typos have been corrected, the final
version to be appear in PRD
|
Phys.Rev.D70:115015,2004
|
10.1103/PhysRevD.70.115015
|
KEK-TH-981
|
hep-ph
| null |
In theories with large extra dimensions, we study the top spin correlations
at the Large Hadron Collider. The s-channel process mediated by graviton
Kaluza-Klein modes contributes to the top-antitop pair production in addition
to the Standard Model processes, and affects the resultant top spin
correlations. We calculated the full density matrix for the top-antitop pair
production. With the fundamental scale of the extra dimensional theory below 2
TeV, we find a sizable deviation of the top spin correlations from the Standard
Model one.
|
[
{
"created": "Thu, 23 Sep 2004 15:35:58 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Nov 2004 03:04:42 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Arai",
"Masato",
""
],
[
"Okada",
"Nobuchika",
""
],
[
"Smolek",
"Karel",
""
],
[
"Simak",
"Vladislav",
""
]
] |
In theories with large extra dimensions, we study the top spin correlations at the Large Hadron Collider. The s-channel process mediated by graviton Kaluza-Klein modes contributes to the top-antitop pair production in addition to the Standard Model processes, and affects the resultant top spin correlations. We calculated the full density matrix for the top-antitop pair production. With the fundamental scale of the extra dimensional theory below 2 TeV, we find a sizable deviation of the top spin correlations from the Standard Model one.
|
2109.10448
|
Tobias Neumann
|
John Campbell, Tobias Neumann, Zack Sullivan
|
Testing parton distribution functions with t-channel single-top-quark
production
|
6 pages, 4 figures; v2: matches published version in PRD
|
Phys. Rev. D 104, 094042 (2021)
|
10.1103/PhysRevD.104.094042
|
FERMILAB-PUB-21-456-T, IIT-CAPP-21-01
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The production of single top-quarks in the t-channel at hadron colliders
imposes strong analytic constraints on parton distribution functions (PDFs)
through its double deeply inelastic scattering (DDIS) form. We exploit this to
provide novel consistency checks between LO, NLO and NNLO PDF fits and propose
to include it as a constraint in future PDF fits. Furthermore, while it is
well-known that the b-quark PDF is highly sensitive to the b-quark mass, we
show that the treatment of this systematic uncertainty is still incomplete,
fragmented or outright missing at the moment. Consequently, we conclude that
the b-quark mass uncertainty is the dominant but so far broadly neglected
theory uncertainty for this process.
|
[
{
"created": "Tue, 21 Sep 2021 22:28:06 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Nov 2021 20:00:37 GMT",
"version": "v2"
}
] |
2021-12-01
|
[
[
"Campbell",
"John",
""
],
[
"Neumann",
"Tobias",
""
],
[
"Sullivan",
"Zack",
""
]
] |
The production of single top-quarks in the t-channel at hadron colliders imposes strong analytic constraints on parton distribution functions (PDFs) through its double deeply inelastic scattering (DDIS) form. We exploit this to provide novel consistency checks between LO, NLO and NNLO PDF fits and propose to include it as a constraint in future PDF fits. Furthermore, while it is well-known that the b-quark PDF is highly sensitive to the b-quark mass, we show that the treatment of this systematic uncertainty is still incomplete, fragmented or outright missing at the moment. Consequently, we conclude that the b-quark mass uncertainty is the dominant but so far broadly neglected theory uncertainty for this process.
|
0802.2487
|
Kazunori Nakayama
|
Masahiro Kawasaki, Kazunori Nakayama
|
Solving Cosmological Problems of Supersymmetric Axion Models in an
Inflationary Universe
|
19 pages, 4 figures
|
Phys.Rev.D77:123524,2008
|
10.1103/PhysRevD.77.123524
|
IPMU 08-0025
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We revisit inflationary cosmology of axion models in the light of recent
developments on the inflaton decay in supergravity. We find that all the
cosmological difficulties, including gravitino, axino overproduction and
axionic isocurvature fluctuation, can be avoided if the saxion field has large
initial amplitude during inflation and decays before big-bang nucleosynthesis.
|
[
{
"created": "Mon, 18 Feb 2008 14:04:36 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Apr 2008 11:19:16 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Kawasaki",
"Masahiro",
""
],
[
"Nakayama",
"Kazunori",
""
]
] |
We revisit inflationary cosmology of axion models in the light of recent developments on the inflaton decay in supergravity. We find that all the cosmological difficulties, including gravitino, axino overproduction and axionic isocurvature fluctuation, can be avoided if the saxion field has large initial amplitude during inflation and decays before big-bang nucleosynthesis.
|
1905.12635
|
Robert McGehee
|
Jeff A. Dror, Gilly Elor, Robert McGehee
|
Direct Detection Signals from Absorption of Fermionic Dark Matter
|
7 pages, 2 figures. v2: published in PRL with minor revisions and
changes to Fig 2 (no change to results)
|
Phys. Rev. Lett. 124, 181301 (2020)
|
10.1103/PhysRevLett.124.181301
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a new class of direct detection signals; absorption of fermionic
dark matter. We enumerate the operators through dimension six which lead to
fermionic absorption, study their direct detection prospects, and summarize
additional constraints on their suppression scale. Such dark matter is
inherently unstable as there is no symmetry which prevents dark matter decays.
Nevertheless, we show that fermionic dark matter absorption can be observed in
direct detection and neutrino experiments while ensuring consistency with the
observed dark matter abundance and required lifetime. For dark matter masses
well below the GeV scale, dedicated searches for these signals at current and
future experiments can probe orders of magnitude of unexplored parameter space.
|
[
{
"created": "Wed, 29 May 2019 18:00:01 GMT",
"version": "v1"
},
{
"created": "Sat, 9 May 2020 06:57:35 GMT",
"version": "v2"
}
] |
2020-05-13
|
[
[
"Dror",
"Jeff A.",
""
],
[
"Elor",
"Gilly",
""
],
[
"McGehee",
"Robert",
""
]
] |
We present a new class of direct detection signals; absorption of fermionic dark matter. We enumerate the operators through dimension six which lead to fermionic absorption, study their direct detection prospects, and summarize additional constraints on their suppression scale. Such dark matter is inherently unstable as there is no symmetry which prevents dark matter decays. Nevertheless, we show that fermionic dark matter absorption can be observed in direct detection and neutrino experiments while ensuring consistency with the observed dark matter abundance and required lifetime. For dark matter masses well below the GeV scale, dedicated searches for these signals at current and future experiments can probe orders of magnitude of unexplored parameter space.
|
hep-ph/0609203
|
R. D. Peccei
|
R. D. Peccei
|
Neutrinos: Windows to New Physics
|
10 pages, to appear in the Proceedings of the XXII International
Conference on Neutrino Physics and Astrophysics, Neutrino 2006, Santa Fe, NM,
June 2006
| null | null | null |
hep-ph
| null |
After briefly reviewing how the symmetries of the Standard Model (SM) are
affected by neutrino masses and mixings, I discuss how these parameters may
arise from GUTs and how patterns in the neutrino sector may reflect some
underlying family symmetry. Leptogenesis provides a nice example of how
different physical phenomena may be connected to the same neutrino window of
physics beyond the SM. I end with some comments on the LSND signal and briefly
discuss the idea that neutrinos have environment dependent masses.
|
[
{
"created": "Wed, 20 Sep 2006 01:03:49 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Peccei",
"R. D.",
""
]
] |
After briefly reviewing how the symmetries of the Standard Model (SM) are affected by neutrino masses and mixings, I discuss how these parameters may arise from GUTs and how patterns in the neutrino sector may reflect some underlying family symmetry. Leptogenesis provides a nice example of how different physical phenomena may be connected to the same neutrino window of physics beyond the SM. I end with some comments on the LSND signal and briefly discuss the idea that neutrinos have environment dependent masses.
|
1509.05416
|
Richard Ruiz
|
Richard Ruiz
|
QCD Corrections to Pair Production of Type III Seesaw Leptons at Hadron
Colliders
|
30 pages in JHEP template. Published version, references add, text
unchanged. Have a good day
|
JHEP 1512 (2015) 165
|
10.1007/JHEP12(2015)165
|
PITT-PACC-1513
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
If kinematically accessible, hadron collider experiments provide an ideal
laboratory for the direct production of heavy lepton partners in Seesaw models.
In the context of the Type III Seesaw Mechanism, the $\mathcal{O}(\alpha_s)$
rate and shape corrections are presented for the pair production of
hypothetical, heavy $SU(2)_L$ triplet leptons in $pp$ collisions at $\sqrt{s}=$
13, 14, and 100 TeV. The next-to-leading order (NLO) $K$-factors span,
approximately, $K^{NLO}=1.1 - 1.4$ for both charged current and neutral current
processes over a triplet mass range $m_T = 100~\text{GeV}-2~\text{TeV}$. Total
production cross sections exhibit a $^{+5\%}_{-6\%}$ scale dependence at 14 TeV
and $\pm1\%$ at 100 TeV. The NLO differential $K$-factors for heavy lepton
kinematics are largely flat, suggesting that na\"ive scaling by the total
$K^{NLO}$ is reasonably justified. The resummed transverse momentum
distribution of the dilepton system is presented at leading logarithmic (LL)
accuracy. The effects of resummation are large in TeV-scale dilepton systems.
Discovery potential to heavy lepton pairs at 14 and 100 TeV is briefly
explored: At the High-Luminosity LHC, we estimate a $4.8-6.3\sigma$ discovery
potential maximally for $m_T = 1.5-1.6~\text{TeV}$ after 3000 fb$^{-1}$. With
300 (3000) fb$^{-1}$, there is $2\sigma$ sensitivity up to $m_T =
1.3-1.4~\text{TeV}~(1.7-1.8~\text{TeV})$ in the individual channels. At 100 TeV
and with 10 fb$^{-1}$, a $5\sigma$ discovery can be achieved for
$m_T=1.4-1.6~\text{TeV}$. Due to the factorization properties of Drell-Yan-type
systems, the fixed order and resummed calculations reduce to convolutions over
tree-level quantities.
|
[
{
"created": "Thu, 17 Sep 2015 20:15:57 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Jan 2016 23:46:03 GMT",
"version": "v2"
}
] |
2016-01-07
|
[
[
"Ruiz",
"Richard",
""
]
] |
If kinematically accessible, hadron collider experiments provide an ideal laboratory for the direct production of heavy lepton partners in Seesaw models. In the context of the Type III Seesaw Mechanism, the $\mathcal{O}(\alpha_s)$ rate and shape corrections are presented for the pair production of hypothetical, heavy $SU(2)_L$ triplet leptons in $pp$ collisions at $\sqrt{s}=$ 13, 14, and 100 TeV. The next-to-leading order (NLO) $K$-factors span, approximately, $K^{NLO}=1.1 - 1.4$ for both charged current and neutral current processes over a triplet mass range $m_T = 100~\text{GeV}-2~\text{TeV}$. Total production cross sections exhibit a $^{+5\%}_{-6\%}$ scale dependence at 14 TeV and $\pm1\%$ at 100 TeV. The NLO differential $K$-factors for heavy lepton kinematics are largely flat, suggesting that na\"ive scaling by the total $K^{NLO}$ is reasonably justified. The resummed transverse momentum distribution of the dilepton system is presented at leading logarithmic (LL) accuracy. The effects of resummation are large in TeV-scale dilepton systems. Discovery potential to heavy lepton pairs at 14 and 100 TeV is briefly explored: At the High-Luminosity LHC, we estimate a $4.8-6.3\sigma$ discovery potential maximally for $m_T = 1.5-1.6~\text{TeV}$ after 3000 fb$^{-1}$. With 300 (3000) fb$^{-1}$, there is $2\sigma$ sensitivity up to $m_T = 1.3-1.4~\text{TeV}~(1.7-1.8~\text{TeV})$ in the individual channels. At 100 TeV and with 10 fb$^{-1}$, a $5\sigma$ discovery can be achieved for $m_T=1.4-1.6~\text{TeV}$. Due to the factorization properties of Drell-Yan-type systems, the fixed order and resummed calculations reduce to convolutions over tree-level quantities.
|
hep-ph/0101165
|
Marco Battaglia
|
Marco Battaglia and Klaus Desch
|
Precision Studies of the Higgs Boson Profile at the e+e- Linear Collider
|
20 pages 11 figures, to appear in the Proceedings of the 5th Int.
Linear Collider Workshop LCWS2000, Fermilab, October 2000
| null |
10.1063/1.1394307
| null |
hep-ph
| null |
This paper reviews the potential of a high luminosity e+e- linear collider
(LC) in the precision study of the Higgs boson profile. The complementarity of
the linear collider data with that from the LHC is also discussed together with
a comparison with a muon collider.
|
[
{
"created": "Mon, 15 Jan 2001 20:05:47 GMT",
"version": "v1"
}
] |
2009-11-07
|
[
[
"Battaglia",
"Marco",
""
],
[
"Desch",
"Klaus",
""
]
] |
This paper reviews the potential of a high luminosity e+e- linear collider (LC) in the precision study of the Higgs boson profile. The complementarity of the linear collider data with that from the LHC is also discussed together with a comparison with a muon collider.
|
1406.1757
|
Jean-Baptiste Flament
|
Giacomo Cacciapaglia, Aldo Deandrea, Guillaume Drieu La Rochelle and
Jean-Baptiste Flament
|
Higgs couplings: disentangling New Physics with off-shell measurements
|
6pp, 1 figure
|
Phys. Rev. Lett. 113, 201802 (2014)
|
10.1103/PhysRevLett.113.201802
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
After the discovery of a scalar resonance, resembling the Higgs boson, its
couplings have been extensively studied via the measurement of various
production and decay channels on the invariant mass peak. Recently, it has been
suggested the possibility to use off-shell measurements: in particular, CMS has
published results based on the high- invariant mass cross section of the
process $gg \to ZZ$, which contains the contribution of the Higgs. While this
measurement has been interpreted as a constraint on the Higgs width after very
specific assumptions are taken on the Higgs couplings, in this letter we show
that a much more model-independent interpretation is possible.
|
[
{
"created": "Fri, 6 Jun 2014 17:49:39 GMT",
"version": "v1"
}
] |
2014-11-19
|
[
[
"Cacciapaglia",
"Giacomo",
""
],
[
"Deandrea",
"Aldo",
""
],
[
"La Rochelle",
"Guillaume Drieu",
""
],
[
"Flament",
"Jean-Baptiste",
""
]
] |
After the discovery of a scalar resonance, resembling the Higgs boson, its couplings have been extensively studied via the measurement of various production and decay channels on the invariant mass peak. Recently, it has been suggested the possibility to use off-shell measurements: in particular, CMS has published results based on the high- invariant mass cross section of the process $gg \to ZZ$, which contains the contribution of the Higgs. While this measurement has been interpreted as a constraint on the Higgs width after very specific assumptions are taken on the Higgs couplings, in this letter we show that a much more model-independent interpretation is possible.
|
0910.1186
|
Pasquini Barbara
|
S. Boffi and B. Pasquini (Pavia U. & INFN, Pavia)
|
Probing the parton content of the nucleon
|
10 pages, 6 figures; proceedings of the workshop "Recent Advances in
Perturbative QCD and Hadronic Physics" in Honor of Prof. Anatoly Efremov's
75th Birthday Celebration; to appear in Mod. Phys. Lett. A
|
Mod.Phys.Lett.A24:2882-2892,2009
|
10.1142/S0217732309001091
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The parton content of the nucleon is explored within a meson-cloud model
developed to derive light-cone wave functions for the physical nucleon. The
model is here applied to study electromagnetic form factors, distribution
amplitudes and nucleon-to-meson transition distribution amplitudes.
|
[
{
"created": "Wed, 7 Oct 2009 08:32:40 GMT",
"version": "v1"
}
] |
2010-01-26
|
[
[
"Boffi",
"S.",
"",
"Pavia U. & INFN, Pavia"
],
[
"Pasquini",
"B.",
"",
"Pavia U. & INFN, Pavia"
]
] |
The parton content of the nucleon is explored within a meson-cloud model developed to derive light-cone wave functions for the physical nucleon. The model is here applied to study electromagnetic form factors, distribution amplitudes and nucleon-to-meson transition distribution amplitudes.
|
1510.06657
|
Valentina De Romeri
|
A. Abada, V. De Romeri and A.M. Teixeira
|
Impact of sterile neutrinos on nuclear-assisted cLFV processes
|
32 pages, 11 figures. v2: minor revision, matches published version
on JHEP
| null |
10.1007/JHEP02(2016)083
|
LPT Orsay 15-71, PCCF RI 15-03
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss charged lepton flavour violating processes occurring in the
presence of muonic atoms, such as muon-electron conversion in nuclei
$\text{CR}(\mu -e, \text{ N})$, the (Coulomb enhanced) decay of muonic atoms
into a pair of electrons BR($\mu^- e^- \to e^- e^-$, N), as well as Muonium
conversion and decay, $\text{Mu}-\bar{\text{Mu}}$ and $\text{Mu}\to e^+ e^-$.
Any experimental signal of these observables calls for scenarios of physics
beyond the Standard Model. In this work, we consider minimal extensions of the
Standard Model via the addition of sterile fermions, providing the
corresponding complete analytical expressions for all the considered
observables. We first consider an "ad hoc" extension with a single sterile
fermion state, and investigate its impact on the above observables. Two well
motivated mechanisms of neutrino mass generation are then considered: the
Inverse Seesaw embedded into the Standard Model, and the $\nu$MSM. Our study
reveals that, depending on their mass range and on the active-sterile mixing
angles, sterile neutrinos can give significant contributions to the above
mentioned observables, some of them even lying within present and future
sensitivity of dedicated cLFV experiments. We complete the analysis by
confronting our results to other (direct and indirect) searches for sterile
fermions.
|
[
{
"created": "Thu, 22 Oct 2015 15:27:04 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Feb 2016 16:48:25 GMT",
"version": "v2"
}
] |
2016-03-23
|
[
[
"Abada",
"A.",
""
],
[
"De Romeri",
"V.",
""
],
[
"Teixeira",
"A. M.",
""
]
] |
We discuss charged lepton flavour violating processes occurring in the presence of muonic atoms, such as muon-electron conversion in nuclei $\text{CR}(\mu -e, \text{ N})$, the (Coulomb enhanced) decay of muonic atoms into a pair of electrons BR($\mu^- e^- \to e^- e^-$, N), as well as Muonium conversion and decay, $\text{Mu}-\bar{\text{Mu}}$ and $\text{Mu}\to e^+ e^-$. Any experimental signal of these observables calls for scenarios of physics beyond the Standard Model. In this work, we consider minimal extensions of the Standard Model via the addition of sterile fermions, providing the corresponding complete analytical expressions for all the considered observables. We first consider an "ad hoc" extension with a single sterile fermion state, and investigate its impact on the above observables. Two well motivated mechanisms of neutrino mass generation are then considered: the Inverse Seesaw embedded into the Standard Model, and the $\nu$MSM. Our study reveals that, depending on their mass range and on the active-sterile mixing angles, sterile neutrinos can give significant contributions to the above mentioned observables, some of them even lying within present and future sensitivity of dedicated cLFV experiments. We complete the analysis by confronting our results to other (direct and indirect) searches for sterile fermions.
|
0812.4168
|
Andreas Vogt
|
S. Moch (DESY, Zeuthen), J. Vermaseren (NIKHEF, Amsterdam), A. Vogt
(Liverpool Univ.)
|
Third-order QCD corrections to the charged-current structure function
F_3
|
37 pages, LaTeX, 6 figures (.eps). FORM and Fortran files of main
results appended to source
|
Nucl.Phys.B813:220-258,2009
|
10.1016/j.nuclphysb.2009.01.001
|
DESY 08-197, SFB/CPP-08-105, NIKHEF 08-032, LTH 815
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We compute the coefficient function for the charge-averaged W^(+/-)-exchange
structure function F_3 in deep-inelastic scattering (DIS) to the third order in
massless perturbative QCD. Our new three-loop contribution to this quantity
forms, at not too small values of the Bjorken variable x, the dominant part of
the next-to-next-to-next-to-leading order corrections. It thus facilitates
improved determinations of the strong coupling alpha_s and of 1/Q^2 power
corrections from scaling violations measured in neutrino-nucleon DIS. The
expansion of F_3 in powers of alpha_s is stable at all values of x relevant to
measurements at high scales Q^2. At small x the third-order coefficient
function is dominated by diagrams with the colour structure d_abc d^abc not
present at lower orders. At large x the coefficient function for F_3 is
identical to that of F_1 up to terms vanishing for x to 1.
|
[
{
"created": "Mon, 22 Dec 2008 15:06:46 GMT",
"version": "v1"
}
] |
2010-04-05
|
[
[
"Moch",
"S.",
"",
"DESY, Zeuthen"
],
[
"Vermaseren",
"J.",
"",
"NIKHEF, Amsterdam"
],
[
"Vogt",
"A.",
"",
"Liverpool Univ."
]
] |
We compute the coefficient function for the charge-averaged W^(+/-)-exchange structure function F_3 in deep-inelastic scattering (DIS) to the third order in massless perturbative QCD. Our new three-loop contribution to this quantity forms, at not too small values of the Bjorken variable x, the dominant part of the next-to-next-to-next-to-leading order corrections. It thus facilitates improved determinations of the strong coupling alpha_s and of 1/Q^2 power corrections from scaling violations measured in neutrino-nucleon DIS. The expansion of F_3 in powers of alpha_s is stable at all values of x relevant to measurements at high scales Q^2. At small x the third-order coefficient function is dominated by diagrams with the colour structure d_abc d^abc not present at lower orders. At large x the coefficient function for F_3 is identical to that of F_1 up to terms vanishing for x to 1.
|
1706.09378
|
S. V. Troitsky
|
V. Anastassopoulos, F. Avignone, A. Bykov, G. Cantatore, S.A. Cetin,
A. Derbin, I. Drachnev, R. Djilkibaev, V. Eremin, H. Fischer, A. Gangapshev,
A. Gardikiotis, S. Gninenko, N. Golubev, D.H.H. Hoffmann, M. Karuza, L.
Kravchuk, M. Libanov, A. Lutovinov, M. Maroudas, V. Matveev, S. Molkov, V.
Muratova, V. Pantuev, M. Pavlinsky, K. Ptitsyna, G. Rubtsov, D. Semenov, P.
Sikivie, A. Spiridonov, P. Tinyakov, I. Tkachev, S. Troitsky, E. Unzhakov and
K. Zioutas
|
Towards a medium-scale axion helioscope and haloscope
|
38 pages, 15 figures, JINST style. V2: misprints corrected. V3: minor
clarifications and detalizations, version accepted by JINST
| null |
10.1088/1748-0221/12/11/P11019
| null |
hep-ph astro-ph.HE hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss the physics case for and the concept of a medium-scale axion
helioscope with sensitivities in the axion-photon coupling a few times better
than CERN Axion Solar Telescope (CAST). Search for an axion-like particle with
these couplings is motivated by several persistent astrophysical anomalies. We
present early conceptual design, existing infrastructure, projected sensitivity
and timeline of such a helioscope (Troitsk Axion Solar Telescope Experiment,
TASTE) to be constructed in the Institute for Nuclear Research, Troitsk,
Russia. The proposed instrument may be also used for the search of dark-matter
halo axions.
|
[
{
"created": "Wed, 28 Jun 2017 17:38:10 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Jul 2017 13:34:27 GMT",
"version": "v2"
},
{
"created": "Wed, 8 Nov 2017 09:56:02 GMT",
"version": "v3"
}
] |
2017-12-06
|
[
[
"Anastassopoulos",
"V.",
""
],
[
"Avignone",
"F.",
""
],
[
"Bykov",
"A.",
""
],
[
"Cantatore",
"G.",
""
],
[
"Cetin",
"S. A.",
""
],
[
"Derbin",
"A.",
""
],
[
"Drachnev",
"I.",
""
],
[
"Djilkibaev",
"R.",
""
],
[
"Eremin",
"V.",
""
],
[
"Fischer",
"H.",
""
],
[
"Gangapshev",
"A.",
""
],
[
"Gardikiotis",
"A.",
""
],
[
"Gninenko",
"S.",
""
],
[
"Golubev",
"N.",
""
],
[
"Hoffmann",
"D. H. H.",
""
],
[
"Karuza",
"M.",
""
],
[
"Kravchuk",
"L.",
""
],
[
"Libanov",
"M.",
""
],
[
"Lutovinov",
"A.",
""
],
[
"Maroudas",
"M.",
""
],
[
"Matveev",
"V.",
""
],
[
"Molkov",
"S.",
""
],
[
"Muratova",
"V.",
""
],
[
"Pantuev",
"V.",
""
],
[
"Pavlinsky",
"M.",
""
],
[
"Ptitsyna",
"K.",
""
],
[
"Rubtsov",
"G.",
""
],
[
"Semenov",
"D.",
""
],
[
"Sikivie",
"P.",
""
],
[
"Spiridonov",
"A.",
""
],
[
"Tinyakov",
"P.",
""
],
[
"Tkachev",
"I.",
""
],
[
"Troitsky",
"S.",
""
],
[
"Unzhakov",
"E.",
""
],
[
"Zioutas",
"K.",
""
]
] |
We discuss the physics case for and the concept of a medium-scale axion helioscope with sensitivities in the axion-photon coupling a few times better than CERN Axion Solar Telescope (CAST). Search for an axion-like particle with these couplings is motivated by several persistent astrophysical anomalies. We present early conceptual design, existing infrastructure, projected sensitivity and timeline of such a helioscope (Troitsk Axion Solar Telescope Experiment, TASTE) to be constructed in the Institute for Nuclear Research, Troitsk, Russia. The proposed instrument may be also used for the search of dark-matter halo axions.
|
2201.10354
|
Rui-Qin Wang
|
Xiang-Yu Zhao, Yan-Ting Feng, Feng-Lan Shao, Rui-Qin Wang, Jun Song
|
Production characteristics of light (anti-)nuclei from (anti-)nucleon
coalescence in heavy ion collisions at energies employed at the RHIC beam
energy scan
|
14 pages,10 figures
|
Phys. Rev. C 105, 054908, 2022
|
10.1103/PhysRevC.105.054908
| null |
hep-ph hep-ex nucl-th
|
http://creativecommons.org/publicdomain/zero/1.0/
|
With the kinetic freeze-out nucleons and antinucleons obtained from the quark
combination model, we study the production of light nuclei and antinuclei in
the (anti-)nucleon coalescence mechanism in relativistic heavy ion collisions.
We derive analytic formulas of the momentum distributions of different light
nuclei and apply them to compute transverse momentum ($p_T$) spectra of
(anti-)deuterons ($d$, $\bar d$) and (anti-)tritons ($t$, $\bar t$) in Au-Au
collisions at $\sqrt{s_{NN}}=$7.7, 11.5, 19.6, 27, 39, 54.4 GeV. We find that
the experimental data available for these $p_T$ spectra can be well reproduced.
We further study the yields and yield ratios of different light (anti-)nuclei
and naturally explain their interesting behaviors as a function of the
collision energy. We especially point out that the multi-particle yield ratio
$tp/d^2$ should be carefully corrected from hyperon weak decays for protons to
probe the production characteristics of light nuclei. All of our results show
that the coalescence mechanism for (anti-)nucleons plays a dominant role for
the production of light nuclei and antinuclei at the RHIC beam energy scan
energies.
|
[
{
"created": "Tue, 25 Jan 2022 14:35:56 GMT",
"version": "v1"
}
] |
2022-06-16
|
[
[
"Zhao",
"Xiang-Yu",
""
],
[
"Feng",
"Yan-Ting",
""
],
[
"Shao",
"Feng-Lan",
""
],
[
"Wang",
"Rui-Qin",
""
],
[
"Song",
"Jun",
""
]
] |
With the kinetic freeze-out nucleons and antinucleons obtained from the quark combination model, we study the production of light nuclei and antinuclei in the (anti-)nucleon coalescence mechanism in relativistic heavy ion collisions. We derive analytic formulas of the momentum distributions of different light nuclei and apply them to compute transverse momentum ($p_T$) spectra of (anti-)deuterons ($d$, $\bar d$) and (anti-)tritons ($t$, $\bar t$) in Au-Au collisions at $\sqrt{s_{NN}}=$7.7, 11.5, 19.6, 27, 39, 54.4 GeV. We find that the experimental data available for these $p_T$ spectra can be well reproduced. We further study the yields and yield ratios of different light (anti-)nuclei and naturally explain their interesting behaviors as a function of the collision energy. We especially point out that the multi-particle yield ratio $tp/d^2$ should be carefully corrected from hyperon weak decays for protons to probe the production characteristics of light nuclei. All of our results show that the coalescence mechanism for (anti-)nucleons plays a dominant role for the production of light nuclei and antinuclei at the RHIC beam energy scan energies.
|
0806.4001
|
Jean-Philippe Lansberg
|
J.P. Lansberg, H. Haberzettl
|
J/psi production at the Tevatron and RHIC from s-channel cut
|
Presented by J.P. Lansberg at the Joint Meeting
Heidelberg-Liege-Paris-Wroclaw (HLPW08), Spa, Belgium, 6-8 March 2008, 10
pages, 8 figures, LaTeX, uses aip-6s.clo, aipproc.cls and aipxfm.sty
(included)
|
AIP Conf.Proc.1038:83-92,2008
|
10.1063/1.2987190
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We report on our recent evaluation of the s-channel cut contribution to J/psi
hadroproduction. We show that it is likely significantly larger than the usual
cut contribution of the colour-singlet model (CSM), which is known to
underestimate the experimental measurements. Here the s-channel cut develops
for configurations with off-shell quarks in the bound state. A correct
treatment of its contribution requires the introduction of a four point
function, partially constrained by gauge invariance and limiting behaviours at
small and large momenta. When the unconstrained degrees of freedom are fixed to
reproduce the Tevatron data, we show that RHIC data are remarkably well
reproduced down to very low transverse momenta P_T without need of resummation
of initial-state gluon effects. This unique feature might be typical of
s-channel cut contribution.
|
[
{
"created": "Tue, 24 Jun 2008 23:53:54 GMT",
"version": "v1"
}
] |
2011-03-23
|
[
[
"Lansberg",
"J. P.",
""
],
[
"Haberzettl",
"H.",
""
]
] |
We report on our recent evaluation of the s-channel cut contribution to J/psi hadroproduction. We show that it is likely significantly larger than the usual cut contribution of the colour-singlet model (CSM), which is known to underestimate the experimental measurements. Here the s-channel cut develops for configurations with off-shell quarks in the bound state. A correct treatment of its contribution requires the introduction of a four point function, partially constrained by gauge invariance and limiting behaviours at small and large momenta. When the unconstrained degrees of freedom are fixed to reproduce the Tevatron data, we show that RHIC data are remarkably well reproduced down to very low transverse momenta P_T without need of resummation of initial-state gluon effects. This unique feature might be typical of s-channel cut contribution.
|
1607.06243
|
G.R. Boroun
|
S. Zarrin and G.R. Boroun
|
Solution of QCD$\otimes$QED coupled DGLAP equations at NLO
|
23 pages, 11 figurs
| null |
10.1016/j.nuclphysb.2017.06.016
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this work, we present an analytical solution for QCD$\otimes$QED coupled
Dokshitzer-Gribov-Lipatov-Altarelli-Parisi (DGLAP) evolution equations at the
leading order (LO) accuracy in QED and next-to-leading order (NLO) accuracy in
perturbative QCD using double Laplace transform. This technique is applied to
obtain the singlet, gluon and photon distribution functions and also the proton
structure function. We also obtain contribution of photon in proton at LO and
NLO at high energy and successfully compare the proton structure function with
HERA data \cite{12} and APFEL results \cite{7}. Some comparisons also have been
done for the singlet and gluon distribution functions with the MSTW
results\cite{9}. In addition, the contribution of photon distribution function
inside the proton has been compared with results of MRST \cite{11} and with the
contribution of sea quark distribution functions which obtained by MSTW
\cite{9} and CTEQ6M \cite{14}.
|
[
{
"created": "Thu, 21 Jul 2016 09:23:04 GMT",
"version": "v1"
},
{
"created": "Fri, 23 Sep 2016 10:57:53 GMT",
"version": "v2"
},
{
"created": "Sat, 8 Jul 2017 13:13:38 GMT",
"version": "v3"
}
] |
2017-08-23
|
[
[
"Zarrin",
"S.",
""
],
[
"Boroun",
"G. R.",
""
]
] |
In this work, we present an analytical solution for QCD$\otimes$QED coupled Dokshitzer-Gribov-Lipatov-Altarelli-Parisi (DGLAP) evolution equations at the leading order (LO) accuracy in QED and next-to-leading order (NLO) accuracy in perturbative QCD using double Laplace transform. This technique is applied to obtain the singlet, gluon and photon distribution functions and also the proton structure function. We also obtain contribution of photon in proton at LO and NLO at high energy and successfully compare the proton structure function with HERA data \cite{12} and APFEL results \cite{7}. Some comparisons also have been done for the singlet and gluon distribution functions with the MSTW results\cite{9}. In addition, the contribution of photon distribution function inside the proton has been compared with results of MRST \cite{11} and with the contribution of sea quark distribution functions which obtained by MSTW \cite{9} and CTEQ6M \cite{14}.
|
hep-ph/0101313
|
Meenu Dahiya
|
Ashok Goyal (Department of Physics and Astrophysics, University of
Delhi, India.)
|
Photon-Neutrino Interactions in Magnetic Field through Neutrino Magnetic
Moment
|
LaTex2e file, 9 pages
|
Phys.Rev. D64 (2001) 013005
|
10.1103/PhysRevD.64.013005
| null |
hep-ph
| null |
We study the neutrino-photon processes like $\gamma\gamma\to\nu\bar{\nu}$ in
the presence of uniform external magnetic field for the case when neutrinos can
couple to the electromagnetic field directly through their dipole magnetic
moment and obtain the stellar energy loss. The process would be of special
relevance in astrophysical situations where standard left-handed neutrinos are
trapped and the right handed neutrinos produced through the spin flip
interaction induced by neutrino magnetic moment alone can freely stream out.
|
[
{
"created": "Mon, 29 Jan 2001 10:51:22 GMT",
"version": "v1"
}
] |
2009-11-07
|
[
[
"Goyal",
"Ashok",
"",
"Department of Physics and Astrophysics, University of\n Delhi, India."
]
] |
We study the neutrino-photon processes like $\gamma\gamma\to\nu\bar{\nu}$ in the presence of uniform external magnetic field for the case when neutrinos can couple to the electromagnetic field directly through their dipole magnetic moment and obtain the stellar energy loss. The process would be of special relevance in astrophysical situations where standard left-handed neutrinos are trapped and the right handed neutrinos produced through the spin flip interaction induced by neutrino magnetic moment alone can freely stream out.
|
hep-ph/0412412
|
Mary Hall Reno
|
M. H. Reno (Iowa)
|
Neutrino cross sections at HERA and beyond
|
5 pages, 4 figures, to appear in the Proceedings of the XIII
International Symposium on Very High Energy Cosmic Ray Interactions, 6-12
September 2004, Pylos, Greece
|
Nucl.Phys.Proc.Suppl.151:255-259,2006
|
10.1016/j.nuclphysbps.2005.07.063
| null |
hep-ph
| null |
The ultrahigh energy neutrino cross section is reviewed. Experimental results
from HERA electron-proton and positron-proton scattering have yielded new
information about the small x behavior of the parton distribution functions. We
compare pre-HERA era neutrino-nucleon cross sections with more recent
evaluations.
|
[
{
"created": "Wed, 29 Dec 2004 20:58:29 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Reno",
"M. H.",
"",
"Iowa"
]
] |
The ultrahigh energy neutrino cross section is reviewed. Experimental results from HERA electron-proton and positron-proton scattering have yielded new information about the small x behavior of the parton distribution functions. We compare pre-HERA era neutrino-nucleon cross sections with more recent evaluations.
|
1408.5153
|
Fredy Ochoa
|
R. Martinez, J. Nisperuza, F. Ochoa, J.P. Rubio
|
Scalar Dark Matter with CERN-LEP data and $Z'$ search at the LHC in an
$U(1)'$ Model
|
28 pages, 6 figures
|
Phys. Rev. D 90, 095004 (2014)
|
10.1103/PhysRevD.90.095004
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In the framework of an nonuniversal $U(1)'$ extension of the standard model,
we propose an scalar candidate for cold dark matter which exhibits interactions
with ordinary matter through Higgs and gauge bosons. Using limits from low
energy observables, we find constraints on the new physics parameters of the
model associated to the extra abelian symmetry, in particular, the mass of the
additional neutral gauge boson $Z'$ and the new gauge coupling constant. We
found that for the lower experimental limit $M_{Z'}=3$ TeV constrained by
direct research at LHC, the ratio between the $U(1)'$ and $SU(2)_L$ gauge
coupling constants is around $0.4$. Taking into account this limit and the
observable relic density of the Universe, we search for new constraints on the
mass of the dark matter particle of the model. We found that for a higgsphobic
model, the mass of the scalar dark matter must be $M_{\sigma}=70$ GeV. We also
found different kinematical threshold and resonances that enhance the
dispersion of dark matter into ordinary matter for different regions of the
space of parameters of the model, obtaining masses as low as $1.3$ GeV and as
large as $125$ GeV with not allowed intermediate regions due to resonances.
|
[
{
"created": "Thu, 21 Aug 2014 20:30:35 GMT",
"version": "v1"
}
] |
2014-11-07
|
[
[
"Martinez",
"R.",
""
],
[
"Nisperuza",
"J.",
""
],
[
"Ochoa",
"F.",
""
],
[
"Rubio",
"J. P.",
""
]
] |
In the framework of an nonuniversal $U(1)'$ extension of the standard model, we propose an scalar candidate for cold dark matter which exhibits interactions with ordinary matter through Higgs and gauge bosons. Using limits from low energy observables, we find constraints on the new physics parameters of the model associated to the extra abelian symmetry, in particular, the mass of the additional neutral gauge boson $Z'$ and the new gauge coupling constant. We found that for the lower experimental limit $M_{Z'}=3$ TeV constrained by direct research at LHC, the ratio between the $U(1)'$ and $SU(2)_L$ gauge coupling constants is around $0.4$. Taking into account this limit and the observable relic density of the Universe, we search for new constraints on the mass of the dark matter particle of the model. We found that for a higgsphobic model, the mass of the scalar dark matter must be $M_{\sigma}=70$ GeV. We also found different kinematical threshold and resonances that enhance the dispersion of dark matter into ordinary matter for different regions of the space of parameters of the model, obtaining masses as low as $1.3$ GeV and as large as $125$ GeV with not allowed intermediate regions due to resonances.
|
2307.08014
|
Shu-Run Yuan
|
Bin Yan, C.-P. Yuan, Shu-Run Yuan
|
Probing the $Zb\bar{b}$ coupling at the $Z$-pole of future lepton
colliders
|
4 pages, 6 figures
| null | null | null |
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
The determination of the $Zb\bar{b}$ coupling in experiments has been a
long-standing challenge, as the limited precision of off $Z$-pole measurements
at the LEP has resulted in two degenerate solutions remained to be resolved. In
this paper, we propose a novel method to probe the $Zb\bar{b}$ coupling by
measuring the forward-backward asymmetry of the bottom quark,
$A^{b}_\text{{FB}}$, in the $b\bar{b}$ system of the $e^+ e^- \to b \bar{b}
\gamma$ and/or $e^+ e^- \to b \bar{b} g$ processes at the $Z$-pole of future
lepton colliders. The additional hard photon or light jet radiation can mimic
the energy scanning of the $e^+e^-\to b\bar{b}$ process, and the $A_{\rm FB}^b$
distribution from the $\gamma$-$Z$ interference process is linearly sensitive
to the $Zb\bar{b}$ coupling. By combining the expected measurements of $R^0_b$
and $A^{0,b}_\text{{FB}}$ at the $Z$-pole at the CEPC, the $A^{b}_\text{{FB}}$
distributions can break the degeneracy observed at the LEP, leading to a unique
determination of the $Zb\bar{b}$ coupling through $Z$-pole running alone.
|
[
{
"created": "Sun, 16 Jul 2023 11:52:10 GMT",
"version": "v1"
}
] |
2023-07-18
|
[
[
"Yan",
"Bin",
""
],
[
"Yuan",
"C. -P.",
""
],
[
"Yuan",
"Shu-Run",
""
]
] |
The determination of the $Zb\bar{b}$ coupling in experiments has been a long-standing challenge, as the limited precision of off $Z$-pole measurements at the LEP has resulted in two degenerate solutions remained to be resolved. In this paper, we propose a novel method to probe the $Zb\bar{b}$ coupling by measuring the forward-backward asymmetry of the bottom quark, $A^{b}_\text{{FB}}$, in the $b\bar{b}$ system of the $e^+ e^- \to b \bar{b} \gamma$ and/or $e^+ e^- \to b \bar{b} g$ processes at the $Z$-pole of future lepton colliders. The additional hard photon or light jet radiation can mimic the energy scanning of the $e^+e^-\to b\bar{b}$ process, and the $A_{\rm FB}^b$ distribution from the $\gamma$-$Z$ interference process is linearly sensitive to the $Zb\bar{b}$ coupling. By combining the expected measurements of $R^0_b$ and $A^{0,b}_\text{{FB}}$ at the $Z$-pole at the CEPC, the $A^{b}_\text{{FB}}$ distributions can break the degeneracy observed at the LEP, leading to a unique determination of the $Zb\bar{b}$ coupling through $Z$-pole running alone.
|
2201.08496
|
Arlene Cristina Aguilar
|
J. Papavassiliou, A. C. Aguilar, M. N. Ferreira
|
Theory and phenomenology of the three-gluon vertex
|
8 pages, 9 figures. Invited talk presented by J.P. at the 19th
International Conference on Hadron Spectroscopy and Structure (HADRON 2021),
26 July- 1 August 2021, Mexico City, Mexico
| null | null | null |
hep-ph hep-lat
|
http://creativecommons.org/licenses/by/4.0/
|
The three-gluon vertex is a fundamental ingredient of the intricate QCD
dynamics, being inextricably connected to key nonperturbative phenomena, such
as the emergence of a mass scale in the gauge sector of the theory. In this
presentation, we review the main theoretical properties of the three-gluon
vertex in the Landau gauge, obtained from the fruitful synergy between
functional methods and lattice simulations. We pay particular attention to the
manifestation and origin of the infrared suppression of its main form factors
and the associated zero crossing. In addition, we discuss certain
characteristic phenomenological applications that require this special vertex
as input.
|
[
{
"created": "Fri, 21 Jan 2022 00:33:28 GMT",
"version": "v1"
}
] |
2022-01-24
|
[
[
"Papavassiliou",
"J.",
""
],
[
"Aguilar",
"A. C.",
""
],
[
"Ferreira",
"M. N.",
""
]
] |
The three-gluon vertex is a fundamental ingredient of the intricate QCD dynamics, being inextricably connected to key nonperturbative phenomena, such as the emergence of a mass scale in the gauge sector of the theory. In this presentation, we review the main theoretical properties of the three-gluon vertex in the Landau gauge, obtained from the fruitful synergy between functional methods and lattice simulations. We pay particular attention to the manifestation and origin of the infrared suppression of its main form factors and the associated zero crossing. In addition, we discuss certain characteristic phenomenological applications that require this special vertex as input.
|
hep-ph/0407051
|
Albrecht Kyrieleis
|
J. Bartels and A. Kyrieleis
|
NLO Corrections to the \gamma* Impact Factor: First Numerical Results
for the Real Corrections to \gamma*_L
|
27 pages, 5 figures, uses revtex4; misprint in fig.4,5 and typos
corrected; for associated files, see
http://www.desy.de/uni-th/smallx/kyrie/ImpFactor/index.html
|
Phys.Rev. D70 (2004) 114003
|
10.1103/PhysRevD.70.114003
|
DESY 04-116
|
hep-ph
| null |
We analytically perform the transverse momentum integrations in the real
corrections to the longitudinal \gamma*_L impact factor. The resulting
integrals are Feynman parameter integrals, and we provide a MATHEMATICA file
which contains the integrands. The remaining integrals are carried out
numerically. We perform a numerical test, and we compute those parts of the
impact factor which depend upon the energy scale s_0: they are found to be
negative and, with decreasing values of s_0, their absolute value increases.
|
[
{
"created": "Mon, 5 Jul 2004 18:01:00 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Dec 2004 16:12:16 GMT",
"version": "v2"
}
] |
2009-11-10
|
[
[
"Bartels",
"J.",
""
],
[
"Kyrieleis",
"A.",
""
]
] |
We analytically perform the transverse momentum integrations in the real corrections to the longitudinal \gamma*_L impact factor. The resulting integrals are Feynman parameter integrals, and we provide a MATHEMATICA file which contains the integrands. The remaining integrals are carried out numerically. We perform a numerical test, and we compute those parts of the impact factor which depend upon the energy scale s_0: they are found to be negative and, with decreasing values of s_0, their absolute value increases.
|
1210.1567
|
Tomasz Stebel
|
Tomasz Stebel
|
Quantitative analysis of Geometrical Scaling in Deep Inelastic
Scattering
|
Master Thesis prepared in the Institute of Physics of the
Jagiellonian University; 76 pages, 116 figures
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We analyze geometrical scaling in deep inelastic scattering using
experimental data from HERA ep collider. Parallel analyses are performed for
energy and Bjorken-x data binnings. In particular, value of parameter \lambda
which governs x-dependence of saturation scale is found for both binnings:
\lambda_En = 0.352 \pm 0.008 and \lambda_Bj = 0.302 \pm 0.004. We use the
following method: \lambda_En is found as a value for which ratios
\sigma^{W1}_{\gamma*p}(\tau)/\sigma^{W2}_{\gamma*p}(\tau) are closest to 1
(\sigma^{Wi}_{\gamma*p} is a photon-proton cross section with definite energy
W_i and \tau = Q^2 x^{\lambda} is a scaling variable); \lambda_Bj is found
analogously using ratios of cross sections with definite Bjorken-x variable. We
show also that GS is present for x<0.2.
|
[
{
"created": "Thu, 4 Oct 2012 19:59:37 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Nov 2012 18:36:52 GMT",
"version": "v2"
},
{
"created": "Mon, 4 Feb 2013 14:09:11 GMT",
"version": "v3"
}
] |
2013-02-05
|
[
[
"Stebel",
"Tomasz",
""
]
] |
We analyze geometrical scaling in deep inelastic scattering using experimental data from HERA ep collider. Parallel analyses are performed for energy and Bjorken-x data binnings. In particular, value of parameter \lambda which governs x-dependence of saturation scale is found for both binnings: \lambda_En = 0.352 \pm 0.008 and \lambda_Bj = 0.302 \pm 0.004. We use the following method: \lambda_En is found as a value for which ratios \sigma^{W1}_{\gamma*p}(\tau)/\sigma^{W2}_{\gamma*p}(\tau) are closest to 1 (\sigma^{Wi}_{\gamma*p} is a photon-proton cross section with definite energy W_i and \tau = Q^2 x^{\lambda} is a scaling variable); \lambda_Bj is found analogously using ratios of cross sections with definite Bjorken-x variable. We show also that GS is present for x<0.2.
|
hep-ph/9608351
|
Mustafa Savci
|
T. M. Aliev (Institute of Physics, Azerbaijanian Academy of Sciences),
N. K. Pak and M. Savci (Middle East Technical University)
|
The Strong Coupling Constants of Excited Positive Parity Heavy Mesons in
Light Cone QCD
|
9 pages, LaTeX formatted
|
Phys.Lett. B390 (1997) 335-340
|
10.1016/S0370-2693(96)01400-1
| null |
hep-ph
| null |
We calculate the strong coupling constants g_(P^(**)P^(*)\pi), where
P^(**)(D^(**), B^(**)) is the 1^+ p-wave state, in the framework of the light
cone QCD sum rules, and using these values of g_(P^(**)P^(*) pi, we compute the
hadronic decay widths for D^(**) -> D^* pi and B^(**) -> B^* pi.
|
[
{
"created": "Fri, 16 Aug 1996 18:03:32 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Aliev",
"T. M.",
"",
"Institute of Physics, Azerbaijanian Academy of Sciences"
],
[
"Pak",
"N. K.",
"",
"Middle East Technical University"
],
[
"Savci",
"M.",
"",
"Middle East Technical University"
]
] |
We calculate the strong coupling constants g_(P^(**)P^(*)\pi), where P^(**)(D^(**), B^(**)) is the 1^+ p-wave state, in the framework of the light cone QCD sum rules, and using these values of g_(P^(**)P^(*) pi, we compute the hadronic decay widths for D^(**) -> D^* pi and B^(**) -> B^* pi.
|
1111.5591
|
Michael Baker
|
Michael J. Baker, J. Bordes, H. M. Chan, S. T. Tsou
|
Developing the Framed Standard Model
|
53 Pages
| null |
10.1142/S0217751X1250087X
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The framed standard model (FSM) suggested earlier, which incorporates the
Higgs field and 3 fermion generations as part of the framed gauge theory
structure, is here developed further to show that it gives both quarks and
leptons hierarchical masses and mixing matrices akin to what is experimentally
observed. Among its many distinguishing features which lead to the above
results are (i) the vacuum is degenerate under a global $su(3)$ symmetry which
plays the role of fermion generations, (ii) the fermion mass matrix is
"universal", rank-one and rotates (changes its orientation in generation space)
with changing scale $\mu$, (iii) the metric in generation space is
scale-dependent too, and in general non-flat, (iv) the theta-angle term in the
QCD action of topological origin gets transformed into the CP-violating phase
of the CKM matrix for quarks, thus offering at the same time a solution to the
strong CP problem.
|
[
{
"created": "Wed, 23 Nov 2011 19:22:54 GMT",
"version": "v1"
}
] |
2012-06-14
|
[
[
"Baker",
"Michael J.",
""
],
[
"Bordes",
"J.",
""
],
[
"Chan",
"H. M.",
""
],
[
"Tsou",
"S. T.",
""
]
] |
The framed standard model (FSM) suggested earlier, which incorporates the Higgs field and 3 fermion generations as part of the framed gauge theory structure, is here developed further to show that it gives both quarks and leptons hierarchical masses and mixing matrices akin to what is experimentally observed. Among its many distinguishing features which lead to the above results are (i) the vacuum is degenerate under a global $su(3)$ symmetry which plays the role of fermion generations, (ii) the fermion mass matrix is "universal", rank-one and rotates (changes its orientation in generation space) with changing scale $\mu$, (iii) the metric in generation space is scale-dependent too, and in general non-flat, (iv) the theta-angle term in the QCD action of topological origin gets transformed into the CP-violating phase of the CKM matrix for quarks, thus offering at the same time a solution to the strong CP problem.
|
hep-ph/9608251
|
Steven Abel
|
S.A.Abel and J.-M.Frere
|
Could the MSSM have no CP violation in the CKM matrix?
|
12 pages + 4 figures, requires epsf.sty, small error +
acknowledgement changed
|
Phys.Rev. D55 (1997) 1623-1629
|
10.1103/PhysRevD.55.1623
|
ULB-TH-96/15
|
hep-ph
| null |
We show that all CP violation in the MSSM could originate in the
supersymmetry breaking sector rather than the CKM matrix, and discuss the
important consequences for $B$-physics.
|
[
{
"created": "Wed, 7 Aug 1996 16:22:08 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Aug 1996 12:20:32 GMT",
"version": "v2"
}
] |
2009-10-28
|
[
[
"Abel",
"S. A.",
""
],
[
"Frere",
"J. -M.",
""
]
] |
We show that all CP violation in the MSSM could originate in the supersymmetry breaking sector rather than the CKM matrix, and discuss the important consequences for $B$-physics.
|
0812.1604
|
Archil Kobakhidze
|
Robert Foot, Archil Kobakhidze, Kristian L. McDonald
|
Dilaton as the Higgs boson
|
6 pages, v2 with expanded discussion
|
Eur.Phys.J.C68:421-424,2010
|
10.1140/epjc/s10052-010-1368-5
| null |
hep-ph gr-qc hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We propose a model where the role of the electroweak Higgs field is played by
the dilaton. The model contains terms which explicitly violate gauge
invariance, however it is shown that this violation is fictitious, so that the
model is a consistent low energy effective theory. In the simplest version of
the idea the resulting low energy effective theory is the same as the top mode
standard model.
|
[
{
"created": "Tue, 9 Dec 2008 01:54:39 GMT",
"version": "v1"
},
{
"created": "Sun, 1 Mar 2009 00:44:58 GMT",
"version": "v2"
}
] |
2014-11-18
|
[
[
"Foot",
"Robert",
""
],
[
"Kobakhidze",
"Archil",
""
],
[
"McDonald",
"Kristian L.",
""
]
] |
We propose a model where the role of the electroweak Higgs field is played by the dilaton. The model contains terms which explicitly violate gauge invariance, however it is shown that this violation is fictitious, so that the model is a consistent low energy effective theory. In the simplest version of the idea the resulting low energy effective theory is the same as the top mode standard model.
|
1504.06291
|
Nobuchika Okada
|
Satsuki Oda, Nobuchika Okada, Dai-suke Takahashi
|
Classically conformal U(1)$^\prime$ extended Standard Model and Higgs
vacuum stability
|
18 pages, 4 figures
|
Phys. Rev. D 92, 015026 (2015)
|
10.1103/PhysRevD.92.015026
| null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider the minimal U(1)$^\prime$ extension of the Standard Model (SM)
with conformal invariance at the classical level, where in addition to the SM
particle contents, three generations of right-handed neutrinos and a
U(1)$^\prime$ Higgs field are introduced. In the presence of the three
right-handed neutrinos, which are responsible for the seesaw mechanism, this
model is free from all the gauge and gravitational anomalies. The U(1)$^\prime$
gauge symmetry is radiatively broken via the Coleman-Weinberg mechanism, by
which the U(1)$^\prime$ gauge boson ($Z^\prime$ boson) mass as well as the
Majorana mass for the right-handed neutrinos are generated. The radiative
U(1)$^\prime$ symmetry breaking also induces a negative mass squared for the SM
Higgs doublet to trigger the electroweak symmetry breaking. In this context, we
investigate a possibility to solve the SM Higgs vacuum instability problem. The
model includes only three free parameters (U(1)$^\prime$ charge of the SM Higgs
doublet, U(1)$^\prime$ gauge coupling and $Z^\prime$ boson mass), for which we
perform parameter scan, and identify a parameter region resolving the SM Higgs
vacuum instability. We also examine naturalness of the model. The heavy states
associated with the U(1)$^\prime$ symmetry breaking contribute to the SM Higgs
self-energy. We find an upper bound on $Z^\prime$ boson mass, $m_{Z^\prime}
\lesssim 6$ TeV, in order to avoid a fine-tuning severer than 10 % level. The
$Z^\prime$ boson in this mass range can be discovered at the LHC Run-2 in the
near future.
|
[
{
"created": "Thu, 23 Apr 2015 18:37:21 GMT",
"version": "v1"
}
] |
2015-08-05
|
[
[
"Oda",
"Satsuki",
""
],
[
"Okada",
"Nobuchika",
""
],
[
"Takahashi",
"Dai-suke",
""
]
] |
We consider the minimal U(1)$^\prime$ extension of the Standard Model (SM) with conformal invariance at the classical level, where in addition to the SM particle contents, three generations of right-handed neutrinos and a U(1)$^\prime$ Higgs field are introduced. In the presence of the three right-handed neutrinos, which are responsible for the seesaw mechanism, this model is free from all the gauge and gravitational anomalies. The U(1)$^\prime$ gauge symmetry is radiatively broken via the Coleman-Weinberg mechanism, by which the U(1)$^\prime$ gauge boson ($Z^\prime$ boson) mass as well as the Majorana mass for the right-handed neutrinos are generated. The radiative U(1)$^\prime$ symmetry breaking also induces a negative mass squared for the SM Higgs doublet to trigger the electroweak symmetry breaking. In this context, we investigate a possibility to solve the SM Higgs vacuum instability problem. The model includes only three free parameters (U(1)$^\prime$ charge of the SM Higgs doublet, U(1)$^\prime$ gauge coupling and $Z^\prime$ boson mass), for which we perform parameter scan, and identify a parameter region resolving the SM Higgs vacuum instability. We also examine naturalness of the model. The heavy states associated with the U(1)$^\prime$ symmetry breaking contribute to the SM Higgs self-energy. We find an upper bound on $Z^\prime$ boson mass, $m_{Z^\prime} \lesssim 6$ TeV, in order to avoid a fine-tuning severer than 10 % level. The $Z^\prime$ boson in this mass range can be discovered at the LHC Run-2 in the near future.
|
2004.05997
|
Yin Jiang
|
Ziyue Wang, Shao-Jian Jiang, Yin Jiang
|
Relativistic Borromean States
|
5 pages, 3 figures
| null |
10.1088/1674-1137/abe197
| null |
hep-ph cond-mat.quant-gas hep-th nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this work the existence of Borromean states has been discussed for bosonic
and fermionic cases in both the relativistic and non-relativistic limits from
the 3-momentum shell renormalization. With the linear bosonic model we checked
the existence of Efimov-like states in the bosonic system. In both limits a
geometric series of singularities are found in the 3-boson interaction vertex,
while the energy ratio is reduced by around 70\% in the relativistic limit
because of the anti-particle contribution. Motivated by the quark-diquark model
in heavy baryon studies, we have carefully examined the p-wave quark-diquark
interaction and found an isolated Borromean pole at finite energy scale. This
may indicate a special baryonic state of light quarks in high energy quark
matters. In other cases trivial results are obtained as expected. In
relativistic limit, for both bosonic and fermionic cases, potential Borromean
states are independent of the mass, which means the results would be valid even
in zero-mass limit as well.
|
[
{
"created": "Sun, 5 Apr 2020 13:21:35 GMT",
"version": "v1"
}
] |
2021-05-26
|
[
[
"Wang",
"Ziyue",
""
],
[
"Jiang",
"Shao-Jian",
""
],
[
"Jiang",
"Yin",
""
]
] |
In this work the existence of Borromean states has been discussed for bosonic and fermionic cases in both the relativistic and non-relativistic limits from the 3-momentum shell renormalization. With the linear bosonic model we checked the existence of Efimov-like states in the bosonic system. In both limits a geometric series of singularities are found in the 3-boson interaction vertex, while the energy ratio is reduced by around 70\% in the relativistic limit because of the anti-particle contribution. Motivated by the quark-diquark model in heavy baryon studies, we have carefully examined the p-wave quark-diquark interaction and found an isolated Borromean pole at finite energy scale. This may indicate a special baryonic state of light quarks in high energy quark matters. In other cases trivial results are obtained as expected. In relativistic limit, for both bosonic and fermionic cases, potential Borromean states are independent of the mass, which means the results would be valid even in zero-mass limit as well.
|
hep-ph/0001308
|
U. Meissner
|
Nadia Fettes, Ulf-G. Mei{\ss}ner, Martin Mojzis, Sven Steininger
|
The chiral effective pion-nucleon Lagrangian of order p^4
|
30 pp, LaTeX2e, coefficients of three third order 1/m^2 corrections
proportional to F_{\mu\nu}^+ corrected in eq.(3.8) and table 4
|
Annals Phys. 283 (2000) 273-302; Erratum-ibid. 288 (2001) 249-250
|
10.1006/aphy.2000.6059
|
FZJ-IKP(TH)-2000-04
|
hep-ph nucl-th
| null |
We construct the minimal effective chiral pion-nucleon SU(2) Lagrangian at
fourth order in the chiral expansion. The Lagrangian contains 118 in principle
measurable terms. We develop both the relativistic as well as the heavy baryon
formulation of the effective field theory. For the latter, we also work out
explicitly all 1/m corrections at fourth order. We display all relevant
relations needed to find the linearly independent terms.
|
[
{
"created": "Sat, 29 Jan 2000 12:51:52 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Jun 2000 14:06:01 GMT",
"version": "v2"
},
{
"created": "Wed, 6 Dec 2000 17:17:14 GMT",
"version": "v3"
}
] |
2009-10-31
|
[
[
"Fettes",
"Nadia",
""
],
[
"Meißner",
"Ulf-G.",
""
],
[
"Mojzis",
"Martin",
""
],
[
"Steininger",
"Sven",
""
]
] |
We construct the minimal effective chiral pion-nucleon SU(2) Lagrangian at fourth order in the chiral expansion. The Lagrangian contains 118 in principle measurable terms. We develop both the relativistic as well as the heavy baryon formulation of the effective field theory. For the latter, we also work out explicitly all 1/m corrections at fourth order. We display all relevant relations needed to find the linearly independent terms.
|
hep-ph/0305126
|
Dimitri Bourilkov
|
Dimitri Bourilkov
|
Study of Parton Density Function Uncertainties with LHAPDF and PYTHIA at
LHC
|
8 pages, 5 tables; code available on request from the author;
Contribution to LHC / LC Study Group Working Document
| null | null | null |
hep-ph
| null |
The experimental errors in current and future hadron colliders are expected
to decrease to a level that will challenge the uncertainties in the theoretical
calculations. One important component in the prediction uncertainties comes
from the Parton Density Functions of the (anti)proton. In this work we develop
an interface from the Les Houches Accord Parton Density Functions (LHAPDF)
package to the very popular Monte Carlo generator {\tt PYTHIA} version 6.2.
Then we proceed to estimate the PDF uncertainties for the production of
Drell-Yan pairs from the Z pole to masses above 1 $\TeV$ and for Higgs bosons
at LHC. The measurement of the electro-weak mixing angle at LHC as a
particularly difficult case is studied.
|
[
{
"created": "Mon, 12 May 2003 17:38:29 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Bourilkov",
"Dimitri",
""
]
] |
The experimental errors in current and future hadron colliders are expected to decrease to a level that will challenge the uncertainties in the theoretical calculations. One important component in the prediction uncertainties comes from the Parton Density Functions of the (anti)proton. In this work we develop an interface from the Les Houches Accord Parton Density Functions (LHAPDF) package to the very popular Monte Carlo generator {\tt PYTHIA} version 6.2. Then we proceed to estimate the PDF uncertainties for the production of Drell-Yan pairs from the Z pole to masses above 1 $\TeV$ and for Higgs bosons at LHC. The measurement of the electro-weak mixing angle at LHC as a particularly difficult case is studied.
|
hep-ph/0204229
|
Iain W. Stewart
|
Aneesh V. Manohar, Thomas Mehen, Dan Pirjol, Iain W. Stewart
|
Reparameterization Invariance for Collinear Operators
|
11 pages
|
Phys.Lett.B539:59-66,2002
|
10.1016/S0370-2693(02)02029-4
|
UCSD/PTH 02-07, INT-PUB-02-36, DUKE-TH-02-220
|
hep-ph
| null |
We discuss restrictions on operators in the soft-collinear effective theory
(SCET) which follow from the ambiguity in the decomposition of collinear
momenta and the freedom in the choice of light-like basis vectors $n$ and $\bar
n$. Invariance of SCET under small changes in $n$ and/or $\bar n$ implies a
symmetry of the effective theory that constrains the form of allowed operators
with collinear fields. The restrictions occur at a given order in the power
counting as well as between different orders. As an example, we present the
complete set of higher order operators that are related to the collinear quark
kinetic term.
|
[
{
"created": "Fri, 19 Apr 2002 18:47:39 GMT",
"version": "v1"
}
] |
2014-11-17
|
[
[
"Manohar",
"Aneesh V.",
""
],
[
"Mehen",
"Thomas",
""
],
[
"Pirjol",
"Dan",
""
],
[
"Stewart",
"Iain W.",
""
]
] |
We discuss restrictions on operators in the soft-collinear effective theory (SCET) which follow from the ambiguity in the decomposition of collinear momenta and the freedom in the choice of light-like basis vectors $n$ and $\bar n$. Invariance of SCET under small changes in $n$ and/or $\bar n$ implies a symmetry of the effective theory that constrains the form of allowed operators with collinear fields. The restrictions occur at a given order in the power counting as well as between different orders. As an example, we present the complete set of higher order operators that are related to the collinear quark kinetic term.
|
1809.10005
|
Joao Pires
|
Joao Pires
|
Scale setting in inclusive jet production at hadron colliders
|
8 pages, 6 figures. Presented at the Sixth Annual Conference on Large
Hadron Collider Physics (LHCP2018), 4-9 June 2018, Bologna, Italy
| null | null |
CFTP/18-013
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this contribution we review the status of inclusive jet cross sections at
hadron colliders in perturbative QCD, studying in particular the
renormalisation and factorisation scale dependence of the one-jet inclusive
cross section at NNLO.
|
[
{
"created": "Wed, 26 Sep 2018 14:05:09 GMT",
"version": "v1"
}
] |
2018-09-27
|
[
[
"Pires",
"Joao",
""
]
] |
In this contribution we review the status of inclusive jet cross sections at hadron colliders in perturbative QCD, studying in particular the renormalisation and factorisation scale dependence of the one-jet inclusive cross section at NNLO.
|
1511.09353
|
Matthias Lutz F.M.
|
Matthias F.M. Lutz, Jens S\"oren Lange, Michael Pennington and Diego
Bettoni, Nora Brambilla, Volker Crede, Simon Eidelman, Albrecht Gillitzer,
Wolfgang Gradl, Christian B. Lang, Volker Metag, Juan Nieves, Sebastian
Neubert, Makoto Oka, Steve L. Olsen, Marco Pappagallo, Stephan Paul, Marc
Peliz\"aus, Alessandro Pilloni, Elisabetta Prencipe, Jim Ritman, Sinead Ryan,
Ulrike Thoma, Ulrich Uwer, Wolfram Weise
|
Resonances in QCD
|
20 pages, 1 figure, report on the EMMI Rapid Reaction Task Force
meeting '{\it Resonances in QCD}', which took place at GSI October 12-14,
2015
| null |
10.1016/j.nuclphysa.2016.01.070
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We report on the EMMI Rapid Reaction Task Force meeting 'Resonances in QCD',
which took place at GSI October 12-14, 2015. A group of 26 people met to
discuss the physics of resonances in QCD. The aim of the meeting was defined by
the following three key questions:
What is needed to understand the physics of resonances in QCD?
Where does QCD lead us to expect resonances with exotic quantum numbers?
What experimental efforts are required to arrive at a coherent picture?
For light mesons and baryons only those with ${\it up}$, ${\it down}$ and
${\it strange}$ quark content were considered. For heavy-light and heavy-heavy
meson systems, those with ${\it charm}$ quarks were the focus. This document
summarizes the discussions by the participants, which in turn led to the
coherent conclusions we present here.
|
[
{
"created": "Mon, 30 Nov 2015 15:40:37 GMT",
"version": "v1"
}
] |
2016-03-23
|
[
[
"Lutz",
"Matthias F. M.",
""
],
[
"Lange",
"Jens Sören",
""
],
[
"Pennington",
"Michael",
""
],
[
"Bettoni",
"Diego",
""
],
[
"Brambilla",
"Nora",
""
],
[
"Crede",
"Volker",
""
],
[
"Eidelman",
"Simon",
""
],
[
"Gillitzer",
"Albrecht",
""
],
[
"Gradl",
"Wolfgang",
""
],
[
"Lang",
"Christian B.",
""
],
[
"Metag",
"Volker",
""
],
[
"Nieves",
"Juan",
""
],
[
"Neubert",
"Sebastian",
""
],
[
"Oka",
"Makoto",
""
],
[
"Olsen",
"Steve L.",
""
],
[
"Pappagallo",
"Marco",
""
],
[
"Paul",
"Stephan",
""
],
[
"Pelizäus",
"Marc",
""
],
[
"Pilloni",
"Alessandro",
""
],
[
"Prencipe",
"Elisabetta",
""
],
[
"Ritman",
"Jim",
""
],
[
"Ryan",
"Sinead",
""
],
[
"Thoma",
"Ulrike",
""
],
[
"Uwer",
"Ulrich",
""
],
[
"Weise",
"Wolfram",
""
]
] |
We report on the EMMI Rapid Reaction Task Force meeting 'Resonances in QCD', which took place at GSI October 12-14, 2015. A group of 26 people met to discuss the physics of resonances in QCD. The aim of the meeting was defined by the following three key questions: What is needed to understand the physics of resonances in QCD? Where does QCD lead us to expect resonances with exotic quantum numbers? What experimental efforts are required to arrive at a coherent picture? For light mesons and baryons only those with ${\it up}$, ${\it down}$ and ${\it strange}$ quark content were considered. For heavy-light and heavy-heavy meson systems, those with ${\it charm}$ quarks were the focus. This document summarizes the discussions by the participants, which in turn led to the coherent conclusions we present here.
|
1003.5450
|
Anurag Tripathi
|
Neelima Agarwal, V. Ravindran, Vivek Kumar Tiwari, Anurag Tripathi
|
$W^+W^-$ production in Large extra dimension model at next-to-leading
order in QCD at the LHC
|
Journal version
|
Phys.Rev.D82:036001,2010
|
10.1103/PhysRevD.82.036001
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present next-to-leading order QCD corrections to production of two $W$
bosons in hadronic collisions in the extra dimension ADD model. Various
kinematical distributions are obtained to order $\alpha_s$ in QCD by taking
into account all the parton level subprocesses. We estimate the impact of the
QCD corrections on various observables and find that they are significant. We
also show the reduction in factorization scale uncertainty when ${\cal
O}(\alpha_s)$ effects are included.
|
[
{
"created": "Mon, 29 Mar 2010 08:07:52 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Sep 2010 11:47:57 GMT",
"version": "v2"
}
] |
2010-09-20
|
[
[
"Agarwal",
"Neelima",
""
],
[
"Ravindran",
"V.",
""
],
[
"Tiwari",
"Vivek Kumar",
""
],
[
"Tripathi",
"Anurag",
""
]
] |
We present next-to-leading order QCD corrections to production of two $W$ bosons in hadronic collisions in the extra dimension ADD model. Various kinematical distributions are obtained to order $\alpha_s$ in QCD by taking into account all the parton level subprocesses. We estimate the impact of the QCD corrections on various observables and find that they are significant. We also show the reduction in factorization scale uncertainty when ${\cal O}(\alpha_s)$ effects are included.
|
hep-ph/9611458
|
Norisuke Sakai
|
N. Sakai
|
Nonperturbative SUSY Gauge Theories with Soft Masses
|
9 pages, LaTeX
| null | null |
TIT/HEP-355
|
hep-ph
| null |
After briefly reviewing the nonperturbative dynamics of N=1 supersymmetric
field theories, soft SUSY breaking mass terms are introduced into the SUSY
gauge theories and their effects on gauge symmetry breaking pattern are
studied. For $N_f<N_c$, we include the dynamics of the non-perturbative
superpotential and use the original (s)quark and gauge fields. For $N_f>N_c+1$,
we formulate the dynamics in terms of dual (s)quarks and a dual gauge group
SU(N_f-N_c). The mass squared of squarks can be negative triggering the
spontaneous breakdown of flavor and color symmetry. The general condition for
the stability of the vacuum is derived. We determine the breaking pattern,
derive the spectrum, and argue that the masses vary smoothly as one crosses
from the Higgs phase into the confining phase exhibiting the complmentarity.
|
[
{
"created": "Thu, 28 Nov 1996 12:35:30 GMT",
"version": "v1"
}
] |
2016-09-06
|
[
[
"Sakai",
"N.",
""
]
] |
After briefly reviewing the nonperturbative dynamics of N=1 supersymmetric field theories, soft SUSY breaking mass terms are introduced into the SUSY gauge theories and their effects on gauge symmetry breaking pattern are studied. For $N_f<N_c$, we include the dynamics of the non-perturbative superpotential and use the original (s)quark and gauge fields. For $N_f>N_c+1$, we formulate the dynamics in terms of dual (s)quarks and a dual gauge group SU(N_f-N_c). The mass squared of squarks can be negative triggering the spontaneous breakdown of flavor and color symmetry. The general condition for the stability of the vacuum is derived. We determine the breaking pattern, derive the spectrum, and argue that the masses vary smoothly as one crosses from the Higgs phase into the confining phase exhibiting the complmentarity.
|
hep-ph/9711517
|
Pierre Binetruy
|
P. Binetruy, E. Dudas, S. Lavignac, C.A. Savoy
|
Quark flavour conserving violations of the lepton number
|
11 pages
|
Phys.Lett.B422:171-178,1998
|
10.1016/S0370-2693(98)00042-2
|
CERN-TH/97-333
|
hep-ph
| null |
We study supersymmetric models of lepton and baryon number violation based on
an abelian family gauge group. Due to possible lepton-Higgs mixing, the lepton
violating couplings are related to the Yukawa couplings and may be generated by
them even if they were absent in the original theory. Such terms may be
dominant and are not given by the naive family charge counting rules. This
enhancement mechanism can provide an alignment between lepton-number violating
terms and Yukawa couplings: as a result they conserve quark flavour. A natural
way of suppressing baryon number violation in this class of models is also
proposed.
|
[
{
"created": "Fri, 28 Nov 1997 17:43:02 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Binetruy",
"P.",
""
],
[
"Dudas",
"E.",
""
],
[
"Lavignac",
"S.",
""
],
[
"Savoy",
"C. A.",
""
]
] |
We study supersymmetric models of lepton and baryon number violation based on an abelian family gauge group. Due to possible lepton-Higgs mixing, the lepton violating couplings are related to the Yukawa couplings and may be generated by them even if they were absent in the original theory. Such terms may be dominant and are not given by the naive family charge counting rules. This enhancement mechanism can provide an alignment between lepton-number violating terms and Yukawa couplings: as a result they conserve quark flavour. A natural way of suppressing baryon number violation in this class of models is also proposed.
|
1212.4546
|
Gil Paz
|
Gil Paz
|
Theory of Inclusive Radiative B Decays: 2012 Update
|
Proceedings of CKM 2012, the 7th International Workshop on the CKM
Unitarity Triangle, University of Cincinnati, USA, 28 September - 2 October
2012
| null | null |
WSU-HEP-1203
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This talk discusses recent developments in the theory of inclusive radiative
B decays, focusing mainly on non-perturbative aspects of the CP asymmetry in
B->Xs gamma.
|
[
{
"created": "Wed, 19 Dec 2012 00:52:47 GMT",
"version": "v1"
}
] |
2012-12-20
|
[
[
"Paz",
"Gil",
""
]
] |
This talk discusses recent developments in the theory of inclusive radiative B decays, focusing mainly on non-perturbative aspects of the CP asymmetry in B->Xs gamma.
|
1512.04391
|
Jose Miguel No
|
Tanja Geib, Stephen F. King, Alexander Merle, Jose Miguel No, Luca
Panizzi
|
Probing the Origin of Neutrino Masses and Mixings via Doubly Charged
Scalars: Complementarity of the Intensity and the Energy Frontiers
|
5 pages, 4 figures, matches version published in Phys. Rev. D
|
Phys. Rev. D 93, 073007 (2016)
|
10.1103/PhysRevD.93.073007
|
MPP-2015-299
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss how the intensity and the energy frontiers provide complementary
constraints within a minimal model of neutrino mass involving just one new
field beyond the Standard Model at accessible energy, namely a doubly charged
scalar $S^{++}$ and its antiparticle $S^{--}$. In particular we focus on the
complementarity between high-energy LHC searches and low-energy probes such as
lepton flavor violation. Our setting is a prime example of how high- and
low-energy physics can cross-fertilize each other.
|
[
{
"created": "Mon, 14 Dec 2015 16:22:31 GMT",
"version": "v1"
},
{
"created": "Fri, 20 May 2016 07:47:56 GMT",
"version": "v2"
}
] |
2016-05-23
|
[
[
"Geib",
"Tanja",
""
],
[
"King",
"Stephen F.",
""
],
[
"Merle",
"Alexander",
""
],
[
"No",
"Jose Miguel",
""
],
[
"Panizzi",
"Luca",
""
]
] |
We discuss how the intensity and the energy frontiers provide complementary constraints within a minimal model of neutrino mass involving just one new field beyond the Standard Model at accessible energy, namely a doubly charged scalar $S^{++}$ and its antiparticle $S^{--}$. In particular we focus on the complementarity between high-energy LHC searches and low-energy probes such as lepton flavor violation. Our setting is a prime example of how high- and low-energy physics can cross-fertilize each other.
|
hep-ph/9503480
|
Ritzi
|
Graciela Gelmini and Bruce Ritzi (UCLA)
|
Chiral Effective Lagrangian Description of Bulk Nuclear Matter
|
7 pages, Tex.
|
Phys.Lett. B357 (1995) 431-434
|
10.1016/0370-2693(95)00924-A
|
UCLA/95/TEP/9
|
hep-ph nucl-th
| null |
Here we point out that the four-nucleon terms incorporate into lowest order
non-linear chiral effective Lagrangians the same description of bulk nuclear
matter contained in the Walecka model, that is generally considered
satisfactory. We find this point worth noticing because, while the Walecka
model is an entirely phenomenological renormalizable model, non-linear chiral
Lagrangians have a deep basis in elementary particle physics, and, in this
sense, are more fundamental.
|
[
{
"created": "Fri, 31 Mar 1995 05:37:37 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Gelmini",
"Graciela",
"",
"UCLA"
],
[
"Ritzi",
"Bruce",
"",
"UCLA"
]
] |
Here we point out that the four-nucleon terms incorporate into lowest order non-linear chiral effective Lagrangians the same description of bulk nuclear matter contained in the Walecka model, that is generally considered satisfactory. We find this point worth noticing because, while the Walecka model is an entirely phenomenological renormalizable model, non-linear chiral Lagrangians have a deep basis in elementary particle physics, and, in this sense, are more fundamental.
|
hep-ph/0411181
|
Hyun-Chul Kim H.-Ch. Kim
|
Hyun-Chul Kim, M. Musakhanov, and M. Siddikov
|
Magnetic susceptibility of the QCD vacuum
|
13 pages, 2 figures
|
Phys.Lett. B608 (2005) 95-106
|
10.1016/j.physletb.2004.12.080
|
PNU-NTG-06/2004
|
hep-ph
| null |
We investigate the magnetic susceptibility of the QCD vacuum, based on the
instanton vacuum. Starting from the instanton liquid model for the instanton
vacuum, we derive the light-quark partition function $Z[V,T,\hat{m}]$ in the
presence of the current quark mass $\hat{m}$ as well as the external Abelian
vector and tensor fields. We calculate a two-point correlation function
relevant for the magnetic susceptibility and derive it beyond the chiral limit.
We obtain for the different flavors the following magnetic susceptibility:
$\chi_{u,d}< i\psi_{u,d}^\dagger \psi_{u,d}>_0 \sim 40\sim45 {\rm MeV}$, while
$\chi_{s}< i\psi_s^\dagger \psi_s >_0 \simeq 6\sim 10 {\rm MeV}$ with the quark
condensate $<i\psi^\dagger \psi>_0$.
|
[
{
"created": "Fri, 12 Nov 2004 23:43:31 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Kim",
"Hyun-Chul",
""
],
[
"Musakhanov",
"M.",
""
],
[
"Siddikov",
"M.",
""
]
] |
We investigate the magnetic susceptibility of the QCD vacuum, based on the instanton vacuum. Starting from the instanton liquid model for the instanton vacuum, we derive the light-quark partition function $Z[V,T,\hat{m}]$ in the presence of the current quark mass $\hat{m}$ as well as the external Abelian vector and tensor fields. We calculate a two-point correlation function relevant for the magnetic susceptibility and derive it beyond the chiral limit. We obtain for the different flavors the following magnetic susceptibility: $\chi_{u,d}< i\psi_{u,d}^\dagger \psi_{u,d}>_0 \sim 40\sim45 {\rm MeV}$, while $\chi_{s}< i\psi_s^\dagger \psi_s >_0 \simeq 6\sim 10 {\rm MeV}$ with the quark condensate $<i\psi^\dagger \psi>_0$.
|
1710.00762
|
Ernest Ma
|
Corey Kownacki, Ernest Ma, Nicholas Pollard, Oleg Popov, and
Mohammadreza Zakeri
|
Dark Revelations of the $[SU(3)]^3$ and $[SU(3)]^4$ Gauge Extensions of
the Standard Model
|
12 pages, no figure
| null |
10.1016/j.physletb.2017.12.018
|
UCRHEP-T585 (Oct 2017)
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Two theoretically well-motivated gauge extensions of the standard model are
$SU(3)_C \times SU(3)_L \times SU(3)_R$ and $SU(3)_q \times SU(3)_L \times
SU(3)_l \times SU(3)_R$, where $SU(3)_q$ is the same as $SU(3)_C$ and $SU(3)_l$
is its color leptonic counterpart. Each as three variations, according to how
$SU(3)_R$ is broken. It is shown here for the first time that a built-in dark
$U(1)_D$ gauge symmetry exists in all six versions, and may be broken to
discrete $Z_2$ dark parity. The available dark matter candidates in each case
include fermions, scalars, as well as {\it vector gauge bosons}. This work
points to the unity of matter with dark matter, the origin of which is not {\it
ad hoc}.
|
[
{
"created": "Mon, 2 Oct 2017 16:30:52 GMT",
"version": "v1"
}
] |
2018-01-17
|
[
[
"Kownacki",
"Corey",
""
],
[
"Ma",
"Ernest",
""
],
[
"Pollard",
"Nicholas",
""
],
[
"Popov",
"Oleg",
""
],
[
"Zakeri",
"Mohammadreza",
""
]
] |
Two theoretically well-motivated gauge extensions of the standard model are $SU(3)_C \times SU(3)_L \times SU(3)_R$ and $SU(3)_q \times SU(3)_L \times SU(3)_l \times SU(3)_R$, where $SU(3)_q$ is the same as $SU(3)_C$ and $SU(3)_l$ is its color leptonic counterpart. Each as three variations, according to how $SU(3)_R$ is broken. It is shown here for the first time that a built-in dark $U(1)_D$ gauge symmetry exists in all six versions, and may be broken to discrete $Z_2$ dark parity. The available dark matter candidates in each case include fermions, scalars, as well as {\it vector gauge bosons}. This work points to the unity of matter with dark matter, the origin of which is not {\it ad hoc}.
|
hep-ph/0101270
|
Tanmay Vachaspati
|
Tanmay Vachaspati
|
Lectures on Cosmic Topological Defects
|
34 pages; lectures at the 2000 summer school in cosmology at ICTP,
Trieste; minor correction in domain wall section
| null | null | null |
hep-ph astro-ph hep-th
| null |
These lectures review certain topological defects and aspects of their
cosmology. Unconventional material includes brief descriptions of electroweak
defects, the structure of domain walls in non-Abelian theories, and the
spectrum of magnetic monopoles in SU(5) Grand Unified theory.
|
[
{
"created": "Wed, 24 Jan 2001 07:06:37 GMT",
"version": "v1"
},
{
"created": "Sun, 4 Feb 2001 04:00:16 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Vachaspati",
"Tanmay",
""
]
] |
These lectures review certain topological defects and aspects of their cosmology. Unconventional material includes brief descriptions of electroweak defects, the structure of domain walls in non-Abelian theories, and the spectrum of magnetic monopoles in SU(5) Grand Unified theory.
|
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