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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1110.5908
|
Jian Tang
|
Jian Tang, Walter Winter
|
Requirements for a New Detector at the South Pole Receiving an
Accelerator Neutrino Beam
|
34 pages, 15 figures. Minor changes and accepted in JHEP
| null |
10.1007/JHEP02(2012)028
|
IDS-NF-031; EURONU-WP6-11-42
|
hep-ph astro-ph.HE hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
There are recent considerations to increase the photomultiplier density in
the IceCube detector array beyond that of DeepCore, which will lead to a lower
detection threshold and a huge fiducial mass for the neutrino detection. This
initiative is known as "Phased IceCube Next Generation Upgrade" (PINGU). We
discuss the possibility to send a neutrino beam from one of the major
accelerator laboratories in the Northern hemisphere to such a detector. Such an
experiment would be unique in the sense that it would be the only neutrino beam
where the baseline crosses the Earth's core. We study the detector requirements
for a beta beam, a neutrino factory beam, and a superbeam, where we consider
both the cases of small theta_13 and large theta_13, as suggested by the recent
T2K and Double Chooz results. We illustrate that a flavor-clean beta beam best
suits the requirements of such a detector, in particular, that PINGU may
replace a magic baseline detector for small values of theta_13 -- even in the
absence of any energy resolution capability. For large theta_13, however, a
single-baseline beta beam experiment cannot compete if it is constrained by the
CERN-SPS. For a neutrino factory, because of the missing charge identification
possibility in the detector, a very good energy resolution is required. If this
can be achieved, especially a low energy neutrino factory, which does not
suffer from the tau contamination, may be an interesting option for large
theta_13. For the superbeam, where we use the LBNE beam as a reference,
electron neutrino flavor identification and statistics are two of the main
limitations. Finally, we demonstrate that, at least in principle, neutrino
factory and superbeam can measure the density of the Earth's core to the
sub-percent level for sin^2 2theta_13 larger than 0.01.
|
[
{
"created": "Wed, 26 Oct 2011 20:00:02 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Jan 2012 12:32:40 GMT",
"version": "v2"
}
] |
2015-05-30
|
[
[
"Tang",
"Jian",
""
],
[
"Winter",
"Walter",
""
]
] |
There are recent considerations to increase the photomultiplier density in the IceCube detector array beyond that of DeepCore, which will lead to a lower detection threshold and a huge fiducial mass for the neutrino detection. This initiative is known as "Phased IceCube Next Generation Upgrade" (PINGU). We discuss the possibility to send a neutrino beam from one of the major accelerator laboratories in the Northern hemisphere to such a detector. Such an experiment would be unique in the sense that it would be the only neutrino beam where the baseline crosses the Earth's core. We study the detector requirements for a beta beam, a neutrino factory beam, and a superbeam, where we consider both the cases of small theta_13 and large theta_13, as suggested by the recent T2K and Double Chooz results. We illustrate that a flavor-clean beta beam best suits the requirements of such a detector, in particular, that PINGU may replace a magic baseline detector for small values of theta_13 -- even in the absence of any energy resolution capability. For large theta_13, however, a single-baseline beta beam experiment cannot compete if it is constrained by the CERN-SPS. For a neutrino factory, because of the missing charge identification possibility in the detector, a very good energy resolution is required. If this can be achieved, especially a low energy neutrino factory, which does not suffer from the tau contamination, may be an interesting option for large theta_13. For the superbeam, where we use the LBNE beam as a reference, electron neutrino flavor identification and statistics are two of the main limitations. Finally, we demonstrate that, at least in principle, neutrino factory and superbeam can measure the density of the Earth's core to the sub-percent level for sin^2 2theta_13 larger than 0.01.
|
hep-ph/0308200
|
Elsayed Lashin Dr.
|
E. I. Lashin
|
CP conserved nonleptonic $K \to \pi \pi \pi $ decays in the Chiral Quark
Model
|
28 pages, 5 figurs, 6 tables
|
Int.J.Mod.Phys. A21 (2006) 3699-3726
|
10.1142/S0217751X06029405
| null |
hep-ph
| null |
The CP conserved non leptonic $K\to \pi \pi \pi$ decays are discussed within
the chiral quark model, including chiral perturbation theory corrections. All
amplitudes are parameterized in terms of quark and gluon condensate and the
constituent quark mass. The same values for these parameters that can be
obtained by a fit of the $\Delta I = 1/2$ rule in $K\to 2 \pi$ give a
reasonably good fit in the $K\to 3 \pi$ case. We compare with the work of other
groups.
|
[
{
"created": "Tue, 19 Aug 2003 21:25:53 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Aug 2006 13:32:51 GMT",
"version": "v2"
}
] |
2009-11-10
|
[
[
"Lashin",
"E. I.",
""
]
] |
The CP conserved non leptonic $K\to \pi \pi \pi$ decays are discussed within the chiral quark model, including chiral perturbation theory corrections. All amplitudes are parameterized in terms of quark and gluon condensate and the constituent quark mass. The same values for these parameters that can be obtained by a fit of the $\Delta I = 1/2$ rule in $K\to 2 \pi$ give a reasonably good fit in the $K\to 3 \pi$ case. We compare with the work of other groups.
|
1910.11224
|
Maxim Malyshev
|
A.V. Lipatov, M.A. Malyshev, H. Jung
|
On relation between Parton Branching Approach and CCFM evolution
|
15 pages, 8 figures
|
Phys. Rev. D 101, 034022 (2020)
|
10.1103/PhysRevD.101.034022
|
DESY 19-183
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider the associated production of electroweak gauge bosons and charm
or beauty quark jets at the LHC using the $k_T$-factorization framework. We
apply the transverse momentum dependent (TMD) parton distributions in a proton
obtained from the Parton Branching (PB) method as well as from the
Catani-Ciafaloni-Fiorani-Marchesini (CCFM) evolution equation. For the PB
approach, our prescription merges the standard leading order ${\cal O}(\alpha
\alpha_s)$ $k_T$-factorization calculations with several tree-level
next-to-leading order ${\cal O}(\alpha \alpha_s^2)$ off-shell production
amplitudes. For the CCFM scenario, our consideration is based on the ${\cal
O}(\alpha \alpha_s^2)$ off-shell gluon-gluon fusion subprocess $g^* g^* \to Z/W
+ Q\bar Q$ and some subleading ${\cal O}(\alpha \alpha_s^2)$ subprocesses
involving quark interactions, taken into account in conventional (collinear)
QCD factorization. We find that the $W + c$ and $Z + b$ cross sections,
calculated within the PB and CCFM-based schemes with the proper choice of
leading and next-to-leading subprocesses, are in good agreement with each
other, thus establishing a correspondence between these two scenarios. A
comparison with the latest LHC experimental data is given and the necessity for
the proper off-shell treatment of the production amplitudes in determination of
the parameters of the TMD parton density is demonstrated.
|
[
{
"created": "Thu, 24 Oct 2019 15:27:27 GMT",
"version": "v1"
}
] |
2020-02-26
|
[
[
"Lipatov",
"A. V.",
""
],
[
"Malyshev",
"M. A.",
""
],
[
"Jung",
"H.",
""
]
] |
We consider the associated production of electroweak gauge bosons and charm or beauty quark jets at the LHC using the $k_T$-factorization framework. We apply the transverse momentum dependent (TMD) parton distributions in a proton obtained from the Parton Branching (PB) method as well as from the Catani-Ciafaloni-Fiorani-Marchesini (CCFM) evolution equation. For the PB approach, our prescription merges the standard leading order ${\cal O}(\alpha \alpha_s)$ $k_T$-factorization calculations with several tree-level next-to-leading order ${\cal O}(\alpha \alpha_s^2)$ off-shell production amplitudes. For the CCFM scenario, our consideration is based on the ${\cal O}(\alpha \alpha_s^2)$ off-shell gluon-gluon fusion subprocess $g^* g^* \to Z/W + Q\bar Q$ and some subleading ${\cal O}(\alpha \alpha_s^2)$ subprocesses involving quark interactions, taken into account in conventional (collinear) QCD factorization. We find that the $W + c$ and $Z + b$ cross sections, calculated within the PB and CCFM-based schemes with the proper choice of leading and next-to-leading subprocesses, are in good agreement with each other, thus establishing a correspondence between these two scenarios. A comparison with the latest LHC experimental data is given and the necessity for the proper off-shell treatment of the production amplitudes in determination of the parameters of the TMD parton density is demonstrated.
|
1404.7096
|
Gudrun Heinrich
|
G. Cullen, H. van Deurzen, N. Greiner, G. Heinrich, G. Luisoni, P.
Mastrolia, E. Mirabella, G. Ossola, T. Peraro, J. Schlenk, J.F. von
Soden-Fraunhofen, F. Tramontano
|
GoSam-2.0: a tool for automated one-loop calculations within the
Standard Model and beyond
|
replaced by published version and reference added
|
Eur.Phys.J. C74 (2014) 8, 3001
|
10.1140/epjc/s10052-014-3001-5
|
DESY 14-061, MPP-2014-145
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present the version 2.0 of the program package GoSam for the automated
calculation of one-loop amplitudes. GoSam is devised to compute one-loop QCD
and/or electroweak corrections to multi-particle processes within and beyond
the Standard Model. The new code contains improvements in the generation and in
the reduction of the amplitudes, performs better in computing time and
numerical accuracy, and has an extended range of applicability. The extended
version of the "Binoth-Les-Houches-Accord" interface to Monte Carlo programs is
also implemented. We give a detailed description of installation and usage of
the code, and illustrate the new features in dedicated examples.
|
[
{
"created": "Mon, 28 Apr 2014 19:02:47 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Jun 2015 12:49:31 GMT",
"version": "v2"
}
] |
2015-06-26
|
[
[
"Cullen",
"G.",
""
],
[
"van Deurzen",
"H.",
""
],
[
"Greiner",
"N.",
""
],
[
"Heinrich",
"G.",
""
],
[
"Luisoni",
"G.",
""
],
[
"Mastrolia",
"P.",
""
],
[
"Mirabella",
"E.",
""
],
[
"Ossola",
"G.",
""
],
[
"Peraro",
"T.",
""
],
[
"Schlenk",
"J.",
""
],
[
"von Soden-Fraunhofen",
"J. F.",
""
],
[
"Tramontano",
"F.",
""
]
] |
We present the version 2.0 of the program package GoSam for the automated calculation of one-loop amplitudes. GoSam is devised to compute one-loop QCD and/or electroweak corrections to multi-particle processes within and beyond the Standard Model. The new code contains improvements in the generation and in the reduction of the amplitudes, performs better in computing time and numerical accuracy, and has an extended range of applicability. The extended version of the "Binoth-Les-Houches-Accord" interface to Monte Carlo programs is also implemented. We give a detailed description of installation and usage of the code, and illustrate the new features in dedicated examples.
|
hep-ph/9705395
|
B. F. L. Ward
|
S. Jadach, W. Placzek and B. F. L. Ward
|
e^+ (Anti)Quark Scattering in the Presence of the Anomalous HERA
Positron-Jet Event Phenomenon
|
9 pages, 3 figures, Latex and bbl files
| null | null |
UTHEP-97-0103
|
hep-ph
| null |
We discuss the leptoquark interpretation of the anomalous HERA positron-jet
events in the context of the YFS exponentiated Monte Carlo event generator
treatment of the attendant multiple photon radiative effects for both the
would-be signal and the SM background, wherein finite-$p_T$ photon effects are
properly taken into account and wherein infrared singularities are cancelled to
all orders in $\alpha$. We show that H1 and ZEUS data are consistent with such
an interpretation for a leptoquark coupling $\lesssim 0.3g_W$, mass $\sim 200$
GeV, and width $\lesssim 2$GeV. Possible future tests are proposed.
|
[
{
"created": "Thu, 22 May 1997 16:07:41 GMT",
"version": "v1"
},
{
"created": "Fri, 23 May 1997 00:28:26 GMT",
"version": "v2"
}
] |
2008-02-03
|
[
[
"Jadach",
"S.",
""
],
[
"Placzek",
"W.",
""
],
[
"Ward",
"B. F. L.",
""
]
] |
We discuss the leptoquark interpretation of the anomalous HERA positron-jet events in the context of the YFS exponentiated Monte Carlo event generator treatment of the attendant multiple photon radiative effects for both the would-be signal and the SM background, wherein finite-$p_T$ photon effects are properly taken into account and wherein infrared singularities are cancelled to all orders in $\alpha$. We show that H1 and ZEUS data are consistent with such an interpretation for a leptoquark coupling $\lesssim 0.3g_W$, mass $\sim 200$ GeV, and width $\lesssim 2$GeV. Possible future tests are proposed.
|
2003.04478
|
Xiangdong Ji
|
Xiangdong Ji
|
Fundamental Properties of the Proton in Light-Front Zero Modes
|
5 pages, no figure
| null |
10.1016/j.nuclphysb.2020.115181
| null |
hep-ph hep-lat nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
For a proton in the infinite momentum frame, its wave function contains a
zero-momentum part (light-front zero-modes) originated from the modification of
the QCD vacuum in the presence of the valence quarks, exhibiting a light-front
long-range order in the quantum state. This ``non-travelling'' component of the
proton contributes to its fundamental properties, including the mass and spin,
as well as the naive-time-reversal-odd correlations between transverse momentum
and spin. The large momentum effective theory (LaMET) provides a theoretical
approach to study the physical properties of the proton's zero-mode
``condensate'' through lattice simulations.
|
[
{
"created": "Tue, 10 Mar 2020 00:45:37 GMT",
"version": "v1"
}
] |
2020-10-28
|
[
[
"Ji",
"Xiangdong",
""
]
] |
For a proton in the infinite momentum frame, its wave function contains a zero-momentum part (light-front zero-modes) originated from the modification of the QCD vacuum in the presence of the valence quarks, exhibiting a light-front long-range order in the quantum state. This ``non-travelling'' component of the proton contributes to its fundamental properties, including the mass and spin, as well as the naive-time-reversal-odd correlations between transverse momentum and spin. The large momentum effective theory (LaMET) provides a theoretical approach to study the physical properties of the proton's zero-mode ``condensate'' through lattice simulations.
|
2104.04494
|
Tong Li
|
Tong Li, Michael A. Schmidt, Chang-Yuan Yao, Man Yuan
|
Charged lepton flavor violation in light of the muon magnetic moment
anomaly and colliders
|
21 pages, 4 figures, 4 tables. version accepted by EPJC
| null |
10.1140/epjc/s10052-021-09569-9
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
Any observation of charged lepton flavor violation (CLFV) implies the
existence of new physics beyond the SM in charged lepton sector. CLFV
interactions may also contribute to the muon magnetic moment and explain the
discrepancy between the SM prediction and the recent muon $g-2$ precision
measurement at Fermilab. We consider the most general SM gauge invariant
Lagrangian of $\Delta L=0$ bileptons with CLFV couplings and investigate the
interplay of low-energy precision experiments and colliders in light of the
muon magnetic moment anomaly. We go beyond previous work by demonstrating the
sensitivity of the LHC, the MACE experiment, a proposed muonium-antimuonium
conversion experiment, and a muon collider. Currently-available LHC data is
already able to probe unexplored parameter space via the CLFV process
$pp\to\gamma^*/Z^*\to \ell_1^\pm \ell_1^\pm \ell_2^\mp \ell_2^\mp$.
|
[
{
"created": "Fri, 9 Apr 2021 17:22:38 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Aug 2021 07:22:53 GMT",
"version": "v2"
}
] |
2021-09-29
|
[
[
"Li",
"Tong",
""
],
[
"Schmidt",
"Michael A.",
""
],
[
"Yao",
"Chang-Yuan",
""
],
[
"Yuan",
"Man",
""
]
] |
Any observation of charged lepton flavor violation (CLFV) implies the existence of new physics beyond the SM in charged lepton sector. CLFV interactions may also contribute to the muon magnetic moment and explain the discrepancy between the SM prediction and the recent muon $g-2$ precision measurement at Fermilab. We consider the most general SM gauge invariant Lagrangian of $\Delta L=0$ bileptons with CLFV couplings and investigate the interplay of low-energy precision experiments and colliders in light of the muon magnetic moment anomaly. We go beyond previous work by demonstrating the sensitivity of the LHC, the MACE experiment, a proposed muonium-antimuonium conversion experiment, and a muon collider. Currently-available LHC data is already able to probe unexplored parameter space via the CLFV process $pp\to\gamma^*/Z^*\to \ell_1^\pm \ell_1^\pm \ell_2^\mp \ell_2^\mp$.
|
hep-ph/9501303
|
Michael Eides
|
Michael I. Eides and Valery A. Shelyuto
|
CORRECTIONS OF ORDER $\alpha^2(Z\alpha)^5$ TO HYPERFINE SPLITTING AND
LAMB SHIFT
|
22 pages, LaTeX, 2 figures, 6 tables
|
Phys.Rev.A52:954,1995
|
10.1103/PhysRevA.52.954
|
PSU/TH/155
|
hep-ph
| null |
Corrections to hyperfine splitting and Lamb shift of order
$\alpha^2(Z\alpha)^5$ induced by the diagrams with radiative photon insertions
in the electron line are calculated in the Fried-Yennie gauge. These
contributions are as large as $-7.725(3)\alpha^2(Z\alpha)^5/(\pi
n^3)(m_r/m)^3m$ and $-0.6711(7)\alpha^2(Z\alpha)/(\pi n^3)E_F$ for the Lamb
shift and hyperfine splitting, respectively. Phenomenological implications of
these results are discussed with special emphasis on the accuracy of the
theoretical predictions for the Lamb shift and experimental determination of
the Rydberg constant. New more precise value of the Rydberg constant is
obtained on the basis of the improved theory and experimental data.
|
[
{
"created": "Sun, 15 Jan 1995 19:53:47 GMT",
"version": "v1"
}
] |
2016-09-01
|
[
[
"Eides",
"Michael I.",
""
],
[
"Shelyuto",
"Valery A.",
""
]
] |
Corrections to hyperfine splitting and Lamb shift of order $\alpha^2(Z\alpha)^5$ induced by the diagrams with radiative photon insertions in the electron line are calculated in the Fried-Yennie gauge. These contributions are as large as $-7.725(3)\alpha^2(Z\alpha)^5/(\pi n^3)(m_r/m)^3m$ and $-0.6711(7)\alpha^2(Z\alpha)/(\pi n^3)E_F$ for the Lamb shift and hyperfine splitting, respectively. Phenomenological implications of these results are discussed with special emphasis on the accuracy of the theoretical predictions for the Lamb shift and experimental determination of the Rydberg constant. New more precise value of the Rydberg constant is obtained on the basis of the improved theory and experimental data.
|
1210.5154
|
Mohammad Athar SAJJAD
|
M. Sajjad Athar, M. Honda, T. Kajita, K. Kasahara and S. Midorikawa
|
Atmospheric neutrino flux at INO, South Pole and Pyh\"asalmi
|
12Pages,9Figs
| null |
10.1016/j.physletb.2012.12.016
| null |
hep-ph astro-ph.IM
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present the calculation of the atmospheric neutrino fluxes for the
neutrino experiments proposed at INO, South Pole and Pyh\"asalmi. Neutrino
fluxes have been obtained using ATMNC, a simulation code for cosmic ray in the
atmosphere. Even using the same primary flux model and the interaction model,
the calculated atmospheric neutrino fluxes are different for the different
sites due to the geomagnetic field. The prediction of these fluxes in the
present paper would be quite useful in the experimental analysis.
|
[
{
"created": "Thu, 18 Oct 2012 15:06:09 GMT",
"version": "v1"
}
] |
2015-06-11
|
[
[
"Athar",
"M. Sajjad",
""
],
[
"Honda",
"M.",
""
],
[
"Kajita",
"T.",
""
],
[
"Kasahara",
"K.",
""
],
[
"Midorikawa",
"S.",
""
]
] |
We present the calculation of the atmospheric neutrino fluxes for the neutrino experiments proposed at INO, South Pole and Pyh\"asalmi. Neutrino fluxes have been obtained using ATMNC, a simulation code for cosmic ray in the atmosphere. Even using the same primary flux model and the interaction model, the calculated atmospheric neutrino fluxes are different for the different sites due to the geomagnetic field. The prediction of these fluxes in the present paper would be quite useful in the experimental analysis.
|
hep-ph/9810237
|
Chung-I. Tan
|
Chung-I Tan
|
Diffractive Production at Collider Energies and Factorization
|
LateX, 35 pages, 4 EPS figures, to be published in a special volume
of Physics Report in honor of Richard Slansky
|
Phys.Rept. 315 (1999) 175-198
|
10.1016/S0370-1573(99)00020-4
| null |
hep-ph
| null |
The most important consequence of Pomeron being a pole is the factorization
property. However, due to Pomeron intercept being greater than 1, the
extrapolated single diffraction dissociation cross section based on a classical
triple-Pomeron formula is too large leading to a potential unitarity violation
at Tevatron energies, which has been referred to as "Dino's paradox". We review
our resolution which involves a proper implementation of final-state screening
correction, with "flavoring" for Pomeron as the primary dynamical mechanism for
setting the relevant energy scale. In this approach, factorization remains
intact, and unambiguous predictions for double Pomeron exchange, doubly
diffraction dissociation, etc., both at Tevatron and at LHC energies, can be
made.
|
[
{
"created": "Sat, 3 Oct 1998 17:26:20 GMT",
"version": "v1"
}
] |
2015-06-25
|
[
[
"Tan",
"Chung-I",
""
]
] |
The most important consequence of Pomeron being a pole is the factorization property. However, due to Pomeron intercept being greater than 1, the extrapolated single diffraction dissociation cross section based on a classical triple-Pomeron formula is too large leading to a potential unitarity violation at Tevatron energies, which has been referred to as "Dino's paradox". We review our resolution which involves a proper implementation of final-state screening correction, with "flavoring" for Pomeron as the primary dynamical mechanism for setting the relevant energy scale. In this approach, factorization remains intact, and unambiguous predictions for double Pomeron exchange, doubly diffraction dissociation, etc., both at Tevatron and at LHC energies, can be made.
|
hep-ph/9908400
|
Hyun-Chul Kim
|
Mario Franz, Hyun-Chul Kim, and Klaus Goeke
|
$\Delta S=1,2$ Effective Weak Chiral Lagrangian from the Instanton
Vacuum
|
26 pages. RevTex is used. 9 postscript figures. Submitted to Nucl.
Phys. A. The errors and typos corrected
|
Nucl.Phys. A699 (2002) 541-561
|
10.1016/S0375-9474(01)01275-1
|
PNU-NTG-01/99, RUB-TPII-09/99
|
hep-ph
| null |
We study the effective weak chiral Lagrangian within the framework of the
instanton vacuum. We incorporate the $\Delta S=1,2$ effective weak Hamiltonian
into the effective low-energy QCD partition function defining the chiral
symmetric quark-Goldstone boson interactions with the momentum-dependent
dynamical quark mass. Employing the derivative expansion, we derive the
corresponding weak effective Lagrangian in leading order with the low energy
constants to be used e.g. in chiral perturbation theory. We find that the
momentum-dependent dynamical quark mass plays an essential role in improving
the low energy constants and their ratio $g_{8}/g_{27}$.
|
[
{
"created": "Wed, 18 Aug 1999 14:51:56 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Jul 2001 09:12:30 GMT",
"version": "v2"
}
] |
2009-10-31
|
[
[
"Franz",
"Mario",
""
],
[
"Kim",
"Hyun-Chul",
""
],
[
"Goeke",
"Klaus",
""
]
] |
We study the effective weak chiral Lagrangian within the framework of the instanton vacuum. We incorporate the $\Delta S=1,2$ effective weak Hamiltonian into the effective low-energy QCD partition function defining the chiral symmetric quark-Goldstone boson interactions with the momentum-dependent dynamical quark mass. Employing the derivative expansion, we derive the corresponding weak effective Lagrangian in leading order with the low energy constants to be used e.g. in chiral perturbation theory. We find that the momentum-dependent dynamical quark mass plays an essential role in improving the low energy constants and their ratio $g_{8}/g_{27}$.
|
1803.07575
|
Mae Teo
|
Gustavo Marques-Tavares, Mae Teo
|
Light axions with large hadronic couplings
|
8 pages, 3 figures; v2: references added, minor clarifications
| null |
10.1007/JHEP05(2018)180
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present models in which axions have large couplings to hadrons while
remaining naturally light. By assigning $U(1)_{PQ}$ charges to Standard Model
quarks such that $U(1)_{PQ}$ is not anomalous under QCD, the derivative
couplings naturally arise while no potential is generated for the axion upon
QCD confinement. We present simple models that implement this idea both for an
axion-like particle and for the QCD axion. We show that both models lead to
sizable flavor violations that could be probed by future experiments. Our
construction shows that the axion coupling to hadrons can be essentially
independent from its mass and thus motivates experimental searches in a wide
range of axion parameter space.
|
[
{
"created": "Tue, 20 Mar 2018 18:00:38 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Apr 2018 22:20:28 GMT",
"version": "v2"
}
] |
2018-07-04
|
[
[
"Marques-Tavares",
"Gustavo",
""
],
[
"Teo",
"Mae",
""
]
] |
We present models in which axions have large couplings to hadrons while remaining naturally light. By assigning $U(1)_{PQ}$ charges to Standard Model quarks such that $U(1)_{PQ}$ is not anomalous under QCD, the derivative couplings naturally arise while no potential is generated for the axion upon QCD confinement. We present simple models that implement this idea both for an axion-like particle and for the QCD axion. We show that both models lead to sizable flavor violations that could be probed by future experiments. Our construction shows that the axion coupling to hadrons can be essentially independent from its mass and thus motivates experimental searches in a wide range of axion parameter space.
|
1806.05566
|
Toyokazu Sekiguchi Ph.D
|
Masahiro Kawasaki, Toyokazu Sekiguchi, Masahide Yamaguchi and Jun'ichi
Yokoyama
|
Long-term dynamics of cosmological axion strings
|
12 pages, 5 figures; accepted for publication in PTEP letters
|
Prog Theor Exp Phys (2018)
|
10.1093/ptep/pty098
|
RESCEU-8/18
|
hep-ph astro-ph.CO gr-qc hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present results of new field-theoretic simulation of cosmological axion
strings, which are eight times longer than previous ones. We have upgraded our
simulation of physical strings in Hiramatsu et al. (2011) in terms of the
number of grids as well as the suite of analysis methods. These improvements
enable us to monitor a variety of quantities characterizing the dynamics of the
physical string network for the longest term ever. Our extended simulations
have revealed that global strings do not evolve according to the scaling
solution but its scaling parameter, or the number of long strings per horizon,
increases logarithmically in time. In addition, we have also found that the
scaling parameter shows nontrivial dependence on the breaking scale of the
Peccei-Quinn symmetry.
|
[
{
"created": "Thu, 14 Jun 2018 14:10:23 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Aug 2018 07:07:20 GMT",
"version": "v2"
}
] |
2019-12-06
|
[
[
"Kawasaki",
"Masahiro",
""
],
[
"Sekiguchi",
"Toyokazu",
""
],
[
"Yamaguchi",
"Masahide",
""
],
[
"Yokoyama",
"Jun'ichi",
""
]
] |
We present results of new field-theoretic simulation of cosmological axion strings, which are eight times longer than previous ones. We have upgraded our simulation of physical strings in Hiramatsu et al. (2011) in terms of the number of grids as well as the suite of analysis methods. These improvements enable us to monitor a variety of quantities characterizing the dynamics of the physical string network for the longest term ever. Our extended simulations have revealed that global strings do not evolve according to the scaling solution but its scaling parameter, or the number of long strings per horizon, increases logarithmically in time. In addition, we have also found that the scaling parameter shows nontrivial dependence on the breaking scale of the Peccei-Quinn symmetry.
|
hep-ph/0105308
|
David London
|
Michael Gronau, David London, Nita Sinha and Rahul Sinha
|
Improving Bounds on Penguin Pollution in B -> pi pi
|
10 pages, LaTeX, 3 figures. Abstract modified slightly. Submitted to
Physics Letters
|
Phys.Lett.B514:315-320,2001
|
10.1016/S0370-2693(01)00818-8
|
TECHNION-PH-2001-27, UdeM-GPP-TH-01-89, IMSc-2001/05/27
|
hep-ph hep-ex
| null |
In the presence of penguin contributions, the indirect CP asymmetry in B0(t)
-> pi+ pi- measures sin(2\alpha + 2\theta), where 2\theta parametrizes the size
of the penguin ``pollution.'' We derive a new upper bound on |2\theta|,
requiring the measurement of of BR(B+ -> pi+ pi0) and an upper bound on B00
\equiv {1\over 2} [BR(B0 -> pi0 pi0) + BR(B0bar -> pi0 pi0)]. The new bound is
stronger than those previously discussed in the literature. We also present a
lower bound on B00. Current data may suggest that it is not very small, in
which case \theta can be determined using a complete isospin analysis.
|
[
{
"created": "Tue, 29 May 2001 17:13:10 GMT",
"version": "v1"
},
{
"created": "Fri, 1 Jun 2001 12:32:17 GMT",
"version": "v2"
}
] |
2014-11-17
|
[
[
"Gronau",
"Michael",
""
],
[
"London",
"David",
""
],
[
"Sinha",
"Nita",
""
],
[
"Sinha",
"Rahul",
""
]
] |
In the presence of penguin contributions, the indirect CP asymmetry in B0(t) -> pi+ pi- measures sin(2\alpha + 2\theta), where 2\theta parametrizes the size of the penguin ``pollution.'' We derive a new upper bound on |2\theta|, requiring the measurement of of BR(B+ -> pi+ pi0) and an upper bound on B00 \equiv {1\over 2} [BR(B0 -> pi0 pi0) + BR(B0bar -> pi0 pi0)]. The new bound is stronger than those previously discussed in the literature. We also present a lower bound on B00. Current data may suggest that it is not very small, in which case \theta can be determined using a complete isospin analysis.
|
2003.11823
|
Hyun Min Lee
|
Soo-Min Choi, Jinsu Kim, Hyun Min Lee, Bin Zhu
|
Connecting between inflation and dark matter in models with gauged $Z_3$
symmetry
|
40 pages, 9 figures, Accepted to JHEP, Discussion on heavy degrees of
freedom during inflation added
| null |
10.1007/JHEP06(2020)135
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the possibility of unifying the inflation and dark matter
physics in the minimal model for a complex scalar dark matter with gauged $Z_3$
symmetry. The dark local $U(1)$ symmetry is broken spontaneously into the $Z_3$
symmetry by the dark Higgs mechanism. As compared to dark matter models with
$Z_2$ parity, the dark matter cubic self-interaction restricts the inflation
with non-minimal couplings to take place beyond the pure dark matter direction
and plays an important role in the loop corrections for the inflationary
predictions as well as determining the correct dark matter relic density.
Considering either of $2\rightarrow 2$, $3\rightarrow 2$ or forbidden channels
to be a dominant production mechanism for dark matter, we show the viable
parameter space of the model that is consistent with the theoretical and
phenomenological constraints combined from inflation and dark matter.
|
[
{
"created": "Thu, 26 Mar 2020 10:37:50 GMT",
"version": "v1"
},
{
"created": "Sun, 7 Jun 2020 19:59:45 GMT",
"version": "v2"
}
] |
2020-07-15
|
[
[
"Choi",
"Soo-Min",
""
],
[
"Kim",
"Jinsu",
""
],
[
"Lee",
"Hyun Min",
""
],
[
"Zhu",
"Bin",
""
]
] |
We investigate the possibility of unifying the inflation and dark matter physics in the minimal model for a complex scalar dark matter with gauged $Z_3$ symmetry. The dark local $U(1)$ symmetry is broken spontaneously into the $Z_3$ symmetry by the dark Higgs mechanism. As compared to dark matter models with $Z_2$ parity, the dark matter cubic self-interaction restricts the inflation with non-minimal couplings to take place beyond the pure dark matter direction and plays an important role in the loop corrections for the inflationary predictions as well as determining the correct dark matter relic density. Considering either of $2\rightarrow 2$, $3\rightarrow 2$ or forbidden channels to be a dominant production mechanism for dark matter, we show the viable parameter space of the model that is consistent with the theoretical and phenomenological constraints combined from inflation and dark matter.
|
hep-ph/9410201
|
Apostolos Pilaftsis
|
Z. Gagyi-Palffy, A. Pilaftsis, and K. Schilcher
|
Heavy-Neutrino Chirality Enhancement of the Decay $K_L -> e\mu $ in
Left-Right Symmetric Models
|
16 pages (4 figs appended as a ps file), LaTeX, RAL/94-090 and
MZ-TH/94-22
|
Phys.Lett. B343 (1995) 275-281
|
10.1016/0370-2693(94)01432-C
| null |
hep-ph
| null |
We study the decay $K_L -> e\mu$ in minimal extensions of the Standard Model
based on the gauge groups $SU(2)_L x U(1)_Y$ and $SU(2)_R x SU(2)_L x
U(1)_{B-L}$, in which heavy Majorana neutrinos are present. In $SU(2)_L x
U(1)_Y$ models with chiral neutral singlets, $B(K_L -> e\mu )$ cannot be much
larger than $5 x 10^{-15}$ without violating other low-energy constraints. In
$SU(2)_L x SU(2)_R x U(1)_{B-L}$ models, we find that heavy-neutrino-chirality
enhancements due to the presence of left-handed and right- handed currents can
give rise to a branching ratio close to the present experimental limit $B(K_L
-> e \mu)< 3.3 x 10^{-11}$.
|
[
{
"created": "Mon, 3 Oct 1994 10:31:09 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Gagyi-Palffy",
"Z.",
""
],
[
"Pilaftsis",
"A.",
""
],
[
"Schilcher",
"K.",
""
]
] |
We study the decay $K_L -> e\mu$ in minimal extensions of the Standard Model based on the gauge groups $SU(2)_L x U(1)_Y$ and $SU(2)_R x SU(2)_L x U(1)_{B-L}$, in which heavy Majorana neutrinos are present. In $SU(2)_L x U(1)_Y$ models with chiral neutral singlets, $B(K_L -> e\mu )$ cannot be much larger than $5 x 10^{-15}$ without violating other low-energy constraints. In $SU(2)_L x SU(2)_R x U(1)_{B-L}$ models, we find that heavy-neutrino-chirality enhancements due to the presence of left-handed and right- handed currents can give rise to a branching ratio close to the present experimental limit $B(K_L -> e \mu)< 3.3 x 10^{-11}$.
|
1110.1825
|
Schoeffel Laurent
|
Krzysztof Golec-Biernat (INP Polish Academy of Sciences, Krakow,
University of Rzeszow), Christophe Royon (CEA Saclay), Laurent Schoeffel (CEA
Saclay), Rafal Staszewski (INP Polish Academy of Sciences, Krakow)
|
Electroweak vector boson production at the LHC as a probe of mechanisms
of diffraction
|
9 pages, 6 figures (submitted to Phys. Rev. D)
| null |
10.1103/PhysRevD.84.114006
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We show that the double diffractive electroweak vector boson production in
the $pp$ collisions at the LHC is an ideal probe of QCD based mechanisms of
diffraction. Assuming the resolved Pomeron model with flavor symmetric parton
distributions, the $W$ production asymmetry in rapidity equals exactly zero. In
other approaches, like the soft color interaction model, in which soft gluon
exchanges are responsible for diffraction, the asymmetry is non-zero and equal
to that in the inclusive $W$ production. In the same way, the ratio of the $W$
to $Z$ boson production is independent of rapidity in the models with resolved
Pomeron in contrast to the predictions of the soft color interaction model.
|
[
{
"created": "Sun, 9 Oct 2011 11:56:53 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Sep 2013 15:14:50 GMT",
"version": "v2"
}
] |
2015-05-30
|
[
[
"Golec-Biernat",
"Krzysztof",
"",
"INP Polish Academy of Sciences, Krakow,\n University of Rzeszow"
],
[
"Royon",
"Christophe",
"",
"CEA Saclay"
],
[
"Schoeffel",
"Laurent",
"",
"CEA\n Saclay"
],
[
"Staszewski",
"Rafal",
"",
"INP Polish Academy of Sciences, Krakow"
]
] |
We show that the double diffractive electroweak vector boson production in the $pp$ collisions at the LHC is an ideal probe of QCD based mechanisms of diffraction. Assuming the resolved Pomeron model with flavor symmetric parton distributions, the $W$ production asymmetry in rapidity equals exactly zero. In other approaches, like the soft color interaction model, in which soft gluon exchanges are responsible for diffraction, the asymmetry is non-zero and equal to that in the inclusive $W$ production. In the same way, the ratio of the $W$ to $Z$ boson production is independent of rapidity in the models with resolved Pomeron in contrast to the predictions of the soft color interaction model.
|
hep-ph/0307334
|
Sechul Oh
|
C. S. Kim and Sechul Oh
|
Remarks on the recently observed B decays into $f_X(1300) K$ and $J/\psi
K_X^*(1430)$
|
11 pages, no figure, Revtex; Some comments added; to appear in
Physics Letters B
|
Phys.Lett. B576 (2003) 165-172
|
10.1016/j.physletb.2003.10.007
|
KEK-TH-906
|
hep-ph
| null |
In light of the recent experimental results on decays $B^+ \to f_X(1300) K^+$
and $B^{\pm(0)} \to J/\psi K_X^{*\pm(0)}(1430)$ from Belle, we study the $B \to
P(V) S$ type decays, $B^{\pm(0)} \to f_0(1370) K^{\pm(0)}$ and $B^{\pm(0)} \to
J/\psi K_0^{*\pm(0)}(1430)$, in comparison with the $B \to P(V) T$ type decays,
$B^{\pm(0)} \to f_2(1270) K^{\pm(0)}$ and $B^{\pm(0)} \to J/\psi
K_2^{*\pm(0)}(1430)$. We calculate the BRs for these decays by using the form
factors obtained in the ISGW2 model [the improved version of the original
Isgur-Scora-Grinstein-Wise (ISGW) model], as well as the ISGW model for
comparison. The ratios of ${\cal B}(B \to P(V)S) / {\cal B}(B \to P(V)T)$ are
also presented.
|
[
{
"created": "Mon, 28 Jul 2003 12:59:49 GMT",
"version": "v1"
},
{
"created": "Fri, 3 Oct 2003 14:37:22 GMT",
"version": "v2"
}
] |
2010-04-05
|
[
[
"Kim",
"C. S.",
""
],
[
"Oh",
"Sechul",
""
]
] |
In light of the recent experimental results on decays $B^+ \to f_X(1300) K^+$ and $B^{\pm(0)} \to J/\psi K_X^{*\pm(0)}(1430)$ from Belle, we study the $B \to P(V) S$ type decays, $B^{\pm(0)} \to f_0(1370) K^{\pm(0)}$ and $B^{\pm(0)} \to J/\psi K_0^{*\pm(0)}(1430)$, in comparison with the $B \to P(V) T$ type decays, $B^{\pm(0)} \to f_2(1270) K^{\pm(0)}$ and $B^{\pm(0)} \to J/\psi K_2^{*\pm(0)}(1430)$. We calculate the BRs for these decays by using the form factors obtained in the ISGW2 model [the improved version of the original Isgur-Scora-Grinstein-Wise (ISGW) model], as well as the ISGW model for comparison. The ratios of ${\cal B}(B \to P(V)S) / {\cal B}(B \to P(V)T)$ are also presented.
|
hep-ph/9503214
|
Nir Polonsky-3C13-949
|
Paul Langacker and Nir Polonsky
|
The strong coupling, unification, and recent data
|
12 pages, LaTex + RevTex, uuencoded postscript file (including 13
figures) is attached. Also available at ftp://dept.physics.upenn.edu/pub/Nir
|
Phys.Rev. D52 (1995) 3081-3086
|
10.1103/PhysRevD.52.3081
|
UPR-642T
|
hep-ph
| null |
The prediction of the strong coupling assuming (supersymmetric) coupling
constant unification is reexamined. We find, using the new electroweak data,
$\alpha_{s}(M_{Z}) \approx 0.129 \pm 0.010$. The implications of the large
$\alpha_{s}$ value are discussed. The role played by the $Z$ beauty width is
stressed. It is also emphasized that high-energy (but not low-energy)
corrections could significantly diminish the prediction. However, unless
higher-dimension operators are assumed to be suppressed, at present one cannot
place strong constraints on the super-heavy spectrum. Non-leading electroweak
threshold corrections are also discussed.
|
[
{
"created": "Thu, 2 Mar 1995 17:53:08 GMT",
"version": "v1"
}
] |
2016-09-01
|
[
[
"Langacker",
"Paul",
""
],
[
"Polonsky",
"Nir",
""
]
] |
The prediction of the strong coupling assuming (supersymmetric) coupling constant unification is reexamined. We find, using the new electroweak data, $\alpha_{s}(M_{Z}) \approx 0.129 \pm 0.010$. The implications of the large $\alpha_{s}$ value are discussed. The role played by the $Z$ beauty width is stressed. It is also emphasized that high-energy (but not low-energy) corrections could significantly diminish the prediction. However, unless higher-dimension operators are assumed to be suppressed, at present one cannot place strong constraints on the super-heavy spectrum. Non-leading electroweak threshold corrections are also discussed.
|
hep-ph/9307306
|
Tilo Wettig
|
A.D. Jackson, T. Wettig and N.L. Balazs
|
High--Energy Multiparticle Distributions and a Generalized Lattice Gas
Model
|
4 pages, REVTEX 3.0, NORDITA preprint 93/50
| null | null | null |
hep-ph nucl-th
| null |
A simple lattice gas model in one dimension is constructed in which each site
can be occupied by at most one particle of any one of $D$ species. Particles
interact with a randomly drawn nearest neighbor interaction. This model is
capable of reproducing the factorial moments observed in high--energy
scattering. In the limit $D \rightarrow \infty$, the factorial moments of the
negative binomial distribution are obtained naturally.
|
[
{
"created": "Tue, 20 Jul 1993 11:48:42 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Jackson",
"A. D.",
""
],
[
"Wettig",
"T.",
""
],
[
"Balazs",
"N. L.",
""
]
] |
A simple lattice gas model in one dimension is constructed in which each site can be occupied by at most one particle of any one of $D$ species. Particles interact with a randomly drawn nearest neighbor interaction. This model is capable of reproducing the factorial moments observed in high--energy scattering. In the limit $D \rightarrow \infty$, the factorial moments of the negative binomial distribution are obtained naturally.
|
hep-ph/0201078
|
U. Meissner
|
Ulf-G. Mei{\ss}ner
|
Chiral dynamics with strange quarks: Mysteries and opportunities
|
26 pp, LaTeX2e, 14 figs (uses epsf,epsfig), contribution to the ``Eta
Physics Handbook'', Workshop on Eta Physics, Uppsala, Sweden, Oct. 2001, 2
figs replaced, references added
|
Phys.Scripta T99:68-83,2002
|
10.1238/Physica.Topical.099a00068
|
FZJ-IKP(TH)-2002-01
|
hep-ph nucl-th
| null |
Recent developments and open issues in chiral dynamics with strange quarks
are reviewed. Topics include: Order parameters of chiral symmetry breaking, the
flavor dependence of these order parameters, speculations about the phase
structure of QCD with varying number of flavors, OZI violation and its natural
emergence in case of a small strange quark condensate, heavy kaon chiral
perturbation theory, an update on pion-pion, pion-kaon and pion-nucleon sigma
terms, the dynamics and nature of scalar mesons, the role of the scalar pion
and kaon form factors, attempts to describe some strange baryons employing
coupled channel dynamics tied to unitarity and chiral perturbation theory, and
the role of final state interactions in Goldstone boson pair production in
proton-proton collisions.
|
[
{
"created": "Thu, 10 Jan 2002 17:19:59 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Jan 2002 13:07:43 GMT",
"version": "v2"
},
{
"created": "Tue, 5 Feb 2002 14:01:59 GMT",
"version": "v3"
}
] |
2014-11-17
|
[
[
"Meißner",
"Ulf-G.",
""
]
] |
Recent developments and open issues in chiral dynamics with strange quarks are reviewed. Topics include: Order parameters of chiral symmetry breaking, the flavor dependence of these order parameters, speculations about the phase structure of QCD with varying number of flavors, OZI violation and its natural emergence in case of a small strange quark condensate, heavy kaon chiral perturbation theory, an update on pion-pion, pion-kaon and pion-nucleon sigma terms, the dynamics and nature of scalar mesons, the role of the scalar pion and kaon form factors, attempts to describe some strange baryons employing coupled channel dynamics tied to unitarity and chiral perturbation theory, and the role of final state interactions in Goldstone boson pair production in proton-proton collisions.
|
2207.04190
|
Shan Cheng
|
Jian Chai, Shan Cheng, Yao-hui Ju, Da-cheng Yan, Cai-Dian L\"u and
Zhen-Jun Xiao
|
Charmless two-body $B$ meson decays in perturbative QCD factorization
approach
|
52 pages, 4 figures, 11 tables
|
Chin.Phys.C 46 (2022) 12, 123103
|
10.1088/1674-1137/ac88bd
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The perturbative QCD (PQCD) approach based on $k_T$ factorization has made a
great achievement for the QCD calculation of the hadronic B decays. Regulating
the endpoint divergence by the transverse momentum of quarks in the
propagators, one can do the perturbation calculation for kinds of diagrams
including the annihilation type diagrams. In this paper, we review the current
status of PQCD factorization calculation of two-body charmless $B\to PP, PV,
VV$ decays up to the next-to-leading order (NLO) QCD corrections. two new power
suppressed terms in decaying amplitudes are also taken into account. By using
the universal input (non-perturbative) parameters, we collected the branching
ratios and ${\bf CP}$ asymmetry parameters for all the charmless two body $B$
decays, calculated in the PQCD approach up to the NLO, including some power
suppressed terms in decaying amplitudes. The results are compared with the ones
from QCD factorization approach, soft-collinear effective theory approach and
the current experimental measurements. For most considered B meson decays, the
PQCD results for branching ratios agree well with other approaches and the
experimental data. The PQCD predictions for the ${\bf CP}$ asymmetry parameters
for many of the decay channels do not agree with other approaches, but have a
better agreement with the experimental data. The longstanding $K \pi $ puzzle
about the pattern of the direct CP asymmetries of the penguin-dominated $B \to
K \pi $ decays can be understood after the inclusion of the NLO contributions
in PQCD. The NLO corrections and power suppressed terms play an important role
in the color suppressed and pure annihilation type $B$ decay modes. These rare
decays are more sensitive to different types of corrections, providing
opportunity to examine the factorization approach with the more precise
experimental measurements.
|
[
{
"created": "Sat, 9 Jul 2022 04:21:09 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Jul 2022 06:23:15 GMT",
"version": "v2"
},
{
"created": "Mon, 19 Dec 2022 01:54:02 GMT",
"version": "v3"
}
] |
2022-12-20
|
[
[
"Chai",
"Jian",
""
],
[
"Cheng",
"Shan",
""
],
[
"Ju",
"Yao-hui",
""
],
[
"Yan",
"Da-cheng",
""
],
[
"Lü",
"Cai-Dian",
""
],
[
"Xiao",
"Zhen-Jun",
""
]
] |
The perturbative QCD (PQCD) approach based on $k_T$ factorization has made a great achievement for the QCD calculation of the hadronic B decays. Regulating the endpoint divergence by the transverse momentum of quarks in the propagators, one can do the perturbation calculation for kinds of diagrams including the annihilation type diagrams. In this paper, we review the current status of PQCD factorization calculation of two-body charmless $B\to PP, PV, VV$ decays up to the next-to-leading order (NLO) QCD corrections. two new power suppressed terms in decaying amplitudes are also taken into account. By using the universal input (non-perturbative) parameters, we collected the branching ratios and ${\bf CP}$ asymmetry parameters for all the charmless two body $B$ decays, calculated in the PQCD approach up to the NLO, including some power suppressed terms in decaying amplitudes. The results are compared with the ones from QCD factorization approach, soft-collinear effective theory approach and the current experimental measurements. For most considered B meson decays, the PQCD results for branching ratios agree well with other approaches and the experimental data. The PQCD predictions for the ${\bf CP}$ asymmetry parameters for many of the decay channels do not agree with other approaches, but have a better agreement with the experimental data. The longstanding $K \pi $ puzzle about the pattern of the direct CP asymmetries of the penguin-dominated $B \to K \pi $ decays can be understood after the inclusion of the NLO contributions in PQCD. The NLO corrections and power suppressed terms play an important role in the color suppressed and pure annihilation type $B$ decay modes. These rare decays are more sensitive to different types of corrections, providing opportunity to examine the factorization approach with the more precise experimental measurements.
|
hep-ph/9211243
| null |
R.V. Gavai, R.M. Godbole and K. Sridhar
|
Looking for the gluonic EMC effect in associated $J/\psi$ + $\gamma $
production
|
10 pages, 4 Figures (not included, available only by p-mail), LaTeX,
CERN-TH.6679/92, TIFR/TH/92-59, BU-TH-92/3, Minor revision. Replaced version
has the style file equation.sty appended for easy processing, which is the
only change
|
Phys.Lett.B299:157-164,1993
|
10.1016/0370-2693(93)90897-Q
| null |
hep-ph
| null |
We study the associated production of $ J/\psi\ + \gamma $ in fixed-target
experiments with nuclear targets as well as at the relativistic heavy-ion
collider (RHIC). We find that this process affords a very clean probe of
$\rho_g$, the ratio of gluon density in a heavy nucleus to that of a proton.
The combined $x$ range thus available can be used to discriminate between the
predictions of different models of the EMC effect for $\rho_g$.
|
[
{
"created": "Fri, 13 Nov 1992 08:01:32 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Nov 1992 08:25:56 GMT",
"version": "v2"
}
] |
2011-07-19
|
[
[
"Gavai",
"R. V.",
""
],
[
"Godbole",
"R. M.",
""
],
[
"Sridhar",
"K.",
""
]
] |
We study the associated production of $ J/\psi\ + \gamma $ in fixed-target experiments with nuclear targets as well as at the relativistic heavy-ion collider (RHIC). We find that this process affords a very clean probe of $\rho_g$, the ratio of gluon density in a heavy nucleus to that of a proton. The combined $x$ range thus available can be used to discriminate between the predictions of different models of the EMC effect for $\rho_g$.
|
1903.02275
|
Simone Marzani
|
Andrew J. Larkoski, Simone Marzani, and Chang Wu
|
Theory Predictions for the Pull Angle
|
6 pages, 1 figure
|
Phys. Rev. D 99, 091502 (2019)
|
10.1103/PhysRevD.99.091502
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Pull is a jet observable that is sensitive to color flow between dipoles. It
has seen wide use for discrimination of particles with similar decay topologies
but carrying different color representations and has been measured on W bosons
from top quark decays by the D$\emptyset$ and ATLAS experiments. In this paper,
we present the first theoretical predictions of pull, focusing on a
color-singlet decaying in two jets. The pull angle observable is particularly
sensitive to color flow, but is not infrared and collinear safe and so cannot
be calculated in fixed-order perturbation theory. Nevertheless, all-orders
resummation renders its distribution finite, a property referred to as Sudakov
safety. In our prediction of the pull angle we also include an estimation of
the effects from hadronization, and directly compare our results to simulation
and experimental data.
|
[
{
"created": "Wed, 6 Mar 2019 10:00:50 GMT",
"version": "v1"
}
] |
2019-05-22
|
[
[
"Larkoski",
"Andrew J.",
""
],
[
"Marzani",
"Simone",
""
],
[
"Wu",
"Chang",
""
]
] |
Pull is a jet observable that is sensitive to color flow between dipoles. It has seen wide use for discrimination of particles with similar decay topologies but carrying different color representations and has been measured on W bosons from top quark decays by the D$\emptyset$ and ATLAS experiments. In this paper, we present the first theoretical predictions of pull, focusing on a color-singlet decaying in two jets. The pull angle observable is particularly sensitive to color flow, but is not infrared and collinear safe and so cannot be calculated in fixed-order perturbation theory. Nevertheless, all-orders resummation renders its distribution finite, a property referred to as Sudakov safety. In our prediction of the pull angle we also include an estimation of the effects from hadronization, and directly compare our results to simulation and experimental data.
|
2406.13468
|
Zhao-Huan Yu
|
Jun-Yu Tong, Zhao-Huan Yu, Hong-Hao Zhang
|
Leptogenesis assisted by scalar decays
|
18 pages, 8 figures; minor revisions, references added
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a pragmatic approach to lower down the mass scale of right-handed
neutrinos in leptogenesis by introducing a scalar decaying to right-handed
neutrinos. The key point of our proposal is that the out-of-equilibrium decays
of the scalar provide an additional source for right-handed neutrinos and hence
the lepton asymmetry. This mechanism works well at low temperatures when the
washout of the generated lepton asymmetry is suppressed. Thus, the lepton
asymmetry can be effectively produced despite the washout effect is strong or
not. Through a comprehensive analysis, we demonstrate that such a
scalar-assisted leptogenesis can typically decrease the viable right-handed
neutrino mass scale by two to four orders of magnitude.
|
[
{
"created": "Wed, 19 Jun 2024 11:50:06 GMT",
"version": "v1"
},
{
"created": "Thu, 27 Jun 2024 13:00:29 GMT",
"version": "v2"
}
] |
2024-06-28
|
[
[
"Tong",
"Jun-Yu",
""
],
[
"Yu",
"Zhao-Huan",
""
],
[
"Zhang",
"Hong-Hao",
""
]
] |
We present a pragmatic approach to lower down the mass scale of right-handed neutrinos in leptogenesis by introducing a scalar decaying to right-handed neutrinos. The key point of our proposal is that the out-of-equilibrium decays of the scalar provide an additional source for right-handed neutrinos and hence the lepton asymmetry. This mechanism works well at low temperatures when the washout of the generated lepton asymmetry is suppressed. Thus, the lepton asymmetry can be effectively produced despite the washout effect is strong or not. Through a comprehensive analysis, we demonstrate that such a scalar-assisted leptogenesis can typically decrease the viable right-handed neutrino mass scale by two to four orders of magnitude.
|
hep-ph/0410173
|
Muriel Pivk
|
Muriel Pivk
|
CP violation and the CKM matrix: impact of the asymmetric B Factories
|
4 pages, 8 figures, Contributed to 32nd International Conference on
High-Energy Physics (ICHEP 04), Beijing, China, 16-22 Aug 2004
| null |
10.1142/9789812702227_0176
| null |
hep-ph
| null |
An up-to-date profile of the CKM matrix is presented, with emphasis on the
interpretation of recent CP-violation results from the $B$ factories. The apex
of the Unitarity Triangle is determined by a global CKM fit. A study is
performed to probe the dynamics of B decays into $\pi\pi$, $K\pi$, $\rho\pi$
and $\rho\rho$ within two theoretical frameworks. A model-independent
investigation of New Physics effects in $\Bz\Bzb$ mixing is given.
|
[
{
"created": "Tue, 12 Oct 2004 18:07:10 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Oct 2004 23:35:51 GMT",
"version": "v2"
}
] |
2017-08-23
|
[
[
"Pivk",
"Muriel",
""
]
] |
An up-to-date profile of the CKM matrix is presented, with emphasis on the interpretation of recent CP-violation results from the $B$ factories. The apex of the Unitarity Triangle is determined by a global CKM fit. A study is performed to probe the dynamics of B decays into $\pi\pi$, $K\pi$, $\rho\pi$ and $\rho\rho$ within two theoretical frameworks. A model-independent investigation of New Physics effects in $\Bz\Bzb$ mixing is given.
|
1002.0830
|
Alex Bernardini E
|
Alex E. Bernardini, O. Bertolami
|
Naturalness and stability of the generalized Chaplygin gas in the seesaw
cosmon scenario
|
24 pages, 6 figures
|
Phys.Rev.D81:123013,2010
|
10.1103/PhysRevD.81.123013
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The seesaw mechanism is conceived on the basis that a mass scale, $\xi$, and
a dimensionless scale, $s$, can be fine-tuned in order to control the dynamics
of active and sterile neutrinos through cosmon-type equations of motion: the
seesaw cosmon equations. This allows for sterile neutrinos to be a dark matter
candidate. In this scenario, the dynamical masses and energy densities of
active and sterile neutrinos can be consistently embedded into the generalized
Chaplygin gas (GCG), the unified dark sector model. In addition, dark matter
adiabatically coupled to dark energy allows for a natural decoupling of the
(active) mass varying neutrino (MaVaN) component from the dark sector. Thus
MaVaN's turn into a secondary effect. Through the scale parameters, $\xi$ and
$s$, the proposed scenario allows for a convergence among three distinct
frameworks: the cosmon scenario, the seesaw mechanism for mass generation and
the GCG model. It is found that the equation of state of the perturbations is
the very one of the GCG background cosmology so that all the results from this
approach are maintained, being smoothly modified by active neutrinos.
Constrained by the seesaw relations, it is shown that the mass varying
mechanism is responsible for the stability against linear perturbations and is
indirectly related to the late time cosmological acceleration.
|
[
{
"created": "Wed, 3 Feb 2010 20:25:29 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Apr 2010 21:27:05 GMT",
"version": "v2"
}
] |
2011-06-03
|
[
[
"Bernardini",
"Alex E.",
""
],
[
"Bertolami",
"O.",
""
]
] |
The seesaw mechanism is conceived on the basis that a mass scale, $\xi$, and a dimensionless scale, $s$, can be fine-tuned in order to control the dynamics of active and sterile neutrinos through cosmon-type equations of motion: the seesaw cosmon equations. This allows for sterile neutrinos to be a dark matter candidate. In this scenario, the dynamical masses and energy densities of active and sterile neutrinos can be consistently embedded into the generalized Chaplygin gas (GCG), the unified dark sector model. In addition, dark matter adiabatically coupled to dark energy allows for a natural decoupling of the (active) mass varying neutrino (MaVaN) component from the dark sector. Thus MaVaN's turn into a secondary effect. Through the scale parameters, $\xi$ and $s$, the proposed scenario allows for a convergence among three distinct frameworks: the cosmon scenario, the seesaw mechanism for mass generation and the GCG model. It is found that the equation of state of the perturbations is the very one of the GCG background cosmology so that all the results from this approach are maintained, being smoothly modified by active neutrinos. Constrained by the seesaw relations, it is shown that the mass varying mechanism is responsible for the stability against linear perturbations and is indirectly related to the late time cosmological acceleration.
|
hep-ph/9910231
|
Piotr Chankowski
|
P.H. Chankowski (CERN, Warsaw), W. Krolikowski (Warsaw), S. Pokorski
(Warsaw)
|
Fixed points in the evolution of neutrino mixings
|
17 pages, 2 figures. References added and comments concerning the
two-flavour case changed
|
Phys.Lett.B473:109-117,2000
|
10.1016/S0370-2693(99)01465-3
|
CERN-TH/99-269, IFT-99/22
|
hep-ph
| null |
We derive the renormalization group equations for the neutrino masses and
mixing angles in explicit form and discuss the possible classes of their
solutions. We identify fixed points in the equations for mixing angles, which
can be reached during the evolution for several mass patterns and give
$\sin^22\theta_{sol}=\sin^22\theta_{atm}\sin^2\theta_3/
(\sin^2\theta_{atm}\cos^2\theta_3 + \sin^2\theta_3)^2$, consistently with the
present experimental information. Further experimental test of this relation is
of crucial interest. Moreover, we discuss the stability of quantum corrections
to neutrino mass squared differences. Several interesting mass patterns show
stability in the presence of fixed point solutions for the angles.
|
[
{
"created": "Tue, 5 Oct 1999 00:00:04 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Oct 1999 21:56:02 GMT",
"version": "v2"
},
{
"created": "Fri, 12 Nov 1999 12:53:10 GMT",
"version": "v3"
}
] |
2010-04-06
|
[
[
"Chankowski",
"P. H.",
"",
"CERN, Warsaw"
],
[
"Krolikowski",
"W.",
"",
"Warsaw"
],
[
"Pokorski",
"S.",
"",
"Warsaw"
]
] |
We derive the renormalization group equations for the neutrino masses and mixing angles in explicit form and discuss the possible classes of their solutions. We identify fixed points in the equations for mixing angles, which can be reached during the evolution for several mass patterns and give $\sin^22\theta_{sol}=\sin^22\theta_{atm}\sin^2\theta_3/ (\sin^2\theta_{atm}\cos^2\theta_3 + \sin^2\theta_3)^2$, consistently with the present experimental information. Further experimental test of this relation is of crucial interest. Moreover, we discuss the stability of quantum corrections to neutrino mass squared differences. Several interesting mass patterns show stability in the presence of fixed point solutions for the angles.
|
2203.02859
|
Hidefumi Matsuda Mr
|
Hidefumi Matsuda, Teiji Kunihiro, Akira Ohnishi and Toru T. Takahashi
|
Entropy production in longitudinally expanding Yang-Mills field with use
of Husimi function$-$semiclassical approximation
|
28 pages, 15 figures
| null | null |
YITP-22-24
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the possible thermalization process of the highly occupied and
weakly coupled Yang-Mills fields expanding along the beam axis through an
evaluation of the entropy, particle number, and pressure anisotropy. The time
evolution of the system is calculated by solving the equation of motion for the
Wigner function in the semiclassical approximation with initial conditions
mimicking the glasma. For the evaluation of the entropy, we adopt the
Husimi-Wehrl (HW) entropy, which is obtained by using the Husimi function, a
positive semidefinite quantum distribution function given by smearing the
Wigner function. By numerical calculations at $g=0.1$ and $0.2$, the entropy
production is found to occur together with the particle creation in two
distinct stages: In the first stage, the particle number and the entropy at low
longitudinal momenta grow rapidly. In the second stage, the particle number and
the entropy of higher longitudinal momentum modes show slower increase. The
pressure anisotropy remains in our simulation and implies that the system is
still out-of-equilibrium.
|
[
{
"created": "Sun, 6 Mar 2022 02:48:58 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Mar 2022 07:53:48 GMT",
"version": "v2"
},
{
"created": "Mon, 6 Jun 2022 23:55:03 GMT",
"version": "v3"
}
] |
2022-06-08
|
[
[
"Matsuda",
"Hidefumi",
""
],
[
"Kunihiro",
"Teiji",
""
],
[
"Ohnishi",
"Akira",
""
],
[
"Takahashi",
"Toru T.",
""
]
] |
We investigate the possible thermalization process of the highly occupied and weakly coupled Yang-Mills fields expanding along the beam axis through an evaluation of the entropy, particle number, and pressure anisotropy. The time evolution of the system is calculated by solving the equation of motion for the Wigner function in the semiclassical approximation with initial conditions mimicking the glasma. For the evaluation of the entropy, we adopt the Husimi-Wehrl (HW) entropy, which is obtained by using the Husimi function, a positive semidefinite quantum distribution function given by smearing the Wigner function. By numerical calculations at $g=0.1$ and $0.2$, the entropy production is found to occur together with the particle creation in two distinct stages: In the first stage, the particle number and the entropy at low longitudinal momenta grow rapidly. In the second stage, the particle number and the entropy of higher longitudinal momentum modes show slower increase. The pressure anisotropy remains in our simulation and implies that the system is still out-of-equilibrium.
|
1206.2977
|
Amelia Brennan
|
Nicole F. Bell, Amelia J. Brennan and Thomas D. Jacques
|
Neutrino signals from electroweak bremsstrahlung in solar WIMP
annihilation
|
18 pages, 5 figures. Discussion expanded; matches published version
| null |
10.1088/1475-7516/2012/10/045
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Bremsstrahlung of $W$ and $Z$ gauge bosons, or photons, can be an important
dark matter annihilation channel. In many popular models in which the
annihilation to a pair of light fermions is helicity suppressed, these
bremsstrahlung processes can lift the suppression and thus become the dominant
annihilation channels. The resulting dark matter annihilation products contain
a large, energetic, neutrino component. We consider solar WIMP annihilation in
the case where electroweak bremsstrahlung dominates, and calculate the
resulting neutrino spectra. The flux consists of primary neutrinos produced in
processes such as $\chi\chi\rightarrow \bar{\nu}\nu Z$ and $\chi\chi\rightarrow
\bar{\nu}\ell W$, and secondary neutrinos produced via the decays of gauge
bosons and charged leptons. After dealing with the neutrino propagation and
flavour evolution in the Sun, we consider the prospects for detection in
neutrino experiments on Earth. By comparing our signal with that for
annihilation to $W^+W^-$, we show that the detection prospects for the
bremsstrahlung annihilation channel are favourable.
|
[
{
"created": "Thu, 14 Jun 2012 00:48:49 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Oct 2012 03:21:47 GMT",
"version": "v2"
}
] |
2015-06-05
|
[
[
"Bell",
"Nicole F.",
""
],
[
"Brennan",
"Amelia J.",
""
],
[
"Jacques",
"Thomas D.",
""
]
] |
Bremsstrahlung of $W$ and $Z$ gauge bosons, or photons, can be an important dark matter annihilation channel. In many popular models in which the annihilation to a pair of light fermions is helicity suppressed, these bremsstrahlung processes can lift the suppression and thus become the dominant annihilation channels. The resulting dark matter annihilation products contain a large, energetic, neutrino component. We consider solar WIMP annihilation in the case where electroweak bremsstrahlung dominates, and calculate the resulting neutrino spectra. The flux consists of primary neutrinos produced in processes such as $\chi\chi\rightarrow \bar{\nu}\nu Z$ and $\chi\chi\rightarrow \bar{\nu}\ell W$, and secondary neutrinos produced via the decays of gauge bosons and charged leptons. After dealing with the neutrino propagation and flavour evolution in the Sun, we consider the prospects for detection in neutrino experiments on Earth. By comparing our signal with that for annihilation to $W^+W^-$, we show that the detection prospects for the bremsstrahlung annihilation channel are favourable.
|
hep-ph/9704244
|
Giulia de Divitiis
|
G. M. de Divitiis, R. Petronzio and L. Silvestrini
|
Flavour changing top decays in supersymmetric extensions of the standard
model
|
18 pages, latex files, text + 8 eps files of figures
|
Nucl.Phys.B504:45-60,1997
|
10.1016/S0550-3213(97)00476-8
|
ROM2F-97-08
|
hep-ph
| null |
Flavour changing top decays $t \to c Z^0, t \to c g$ and $t \to c \gamma$ are
predicted with invisible rates within the standard model and may represent a
window on new physics. We consider these processes in supersymmetric extensions
of the standard model and we show that observable rates can be obtained only if
the SUSY breaking is non universal and flavour dependent.
|
[
{
"created": "Sat, 5 Apr 1997 13:09:23 GMT",
"version": "v1"
}
] |
2009-07-09
|
[
[
"de Divitiis",
"G. M.",
""
],
[
"Petronzio",
"R.",
""
],
[
"Silvestrini",
"L.",
""
]
] |
Flavour changing top decays $t \to c Z^0, t \to c g$ and $t \to c \gamma$ are predicted with invisible rates within the standard model and may represent a window on new physics. We consider these processes in supersymmetric extensions of the standard model and we show that observable rates can be obtained only if the SUSY breaking is non universal and flavour dependent.
|
hep-ph/0410062
|
Yannis K. Semertzidis
|
William M. Morse
|
Is the Difference Between the Pion Form Factor Measured in e+e-
Annihilations and tau- Decays Due to an H- Propagator?
|
4 pages, 2 figures
| null | null | null |
hep-ph
| null |
We discuss how a charged Higgs propagator would modify the form factor in
tau- -> pi- pi0 nu_tau decays.
|
[
{
"created": "Mon, 4 Oct 2004 20:18:01 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Morse",
"William M.",
""
]
] |
We discuss how a charged Higgs propagator would modify the form factor in tau- -> pi- pi0 nu_tau decays.
|
hep-ph/0411382
|
Xiangdong Ji
|
Xiangdong Ji, Jian-Ping Ma, and Feng Yuan
|
Factorization of Large-x Quark Distributions in a Hadron
|
7 pages, 2 figures included
|
Phys.Lett. B610 (2005) 247-252
|
10.1016/j.physletb.2005.02.019
|
UM-PP#05-027
|
hep-ph
| null |
We present a factorization formula for valence quark distributions in a
hadron in x-->1 limit. For the example of pion, we arrive at the form of
factorization by analyzing momentum flow in the leading and high-order Feynman
diagrams. The result confirms the well-known 1-x scaling rule to all orders in
perturbation theory, providing the non-perturbative matrix elements for the
infrared-divergence factors. We comment on re-summation of perturbative single
and double logarithms in 1-x.
|
[
{
"created": "Tue, 30 Nov 2004 00:19:44 GMT",
"version": "v1"
}
] |
2010-04-05
|
[
[
"Ji",
"Xiangdong",
""
],
[
"Ma",
"Jian-Ping",
""
],
[
"Yuan",
"Feng",
""
]
] |
We present a factorization formula for valence quark distributions in a hadron in x-->1 limit. For the example of pion, we arrive at the form of factorization by analyzing momentum flow in the leading and high-order Feynman diagrams. The result confirms the well-known 1-x scaling rule to all orders in perturbation theory, providing the non-perturbative matrix elements for the infrared-divergence factors. We comment on re-summation of perturbative single and double logarithms in 1-x.
|
hep-ph/9604239
|
Daijiro Suematsu
|
Daijiro Suematsu
|
Flavor Structure of Soft SUSY Breaking Parameters
|
19 pages, latex, a version published in Phys. Rev. D, minor
corrections
|
Phys.Rev. D54 (1996) 5715-5722
|
10.1103/PhysRevD.54.5715
|
Kanazawa-96-03
|
hep-ph
| null |
Flavor structure of soft supersymmetry breaking parameters is studied in a
certain type of effective supergravity theory derived from moduli/dilaton
dominated supersymmetry breaking. Some interesting sum rules for soft scalar
masses are presented. They constrain their flavor structure and predict some
interesting patterns appeared in soft scalar masses in the non-universal case.
We also study the alignment phenomena in the flavor space of soft breaking
parameters due to Yukawa couplings and discuss their phenomenological
consequences.
|
[
{
"created": "Thu, 4 Apr 1996 07:01:46 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Apr 1996 02:53:23 GMT",
"version": "v2"
},
{
"created": "Mon, 19 Aug 1996 05:12:00 GMT",
"version": "v3"
}
] |
2009-10-28
|
[
[
"Suematsu",
"Daijiro",
""
]
] |
Flavor structure of soft supersymmetry breaking parameters is studied in a certain type of effective supergravity theory derived from moduli/dilaton dominated supersymmetry breaking. Some interesting sum rules for soft scalar masses are presented. They constrain their flavor structure and predict some interesting patterns appeared in soft scalar masses in the non-universal case. We also study the alignment phenomena in the flavor space of soft breaking parameters due to Yukawa couplings and discuss their phenomenological consequences.
|
hep-ph/0110303
|
Masaki Yasue
|
Teruyuki Kitabayashi and Masaki Yasue
|
Large Solar Neutrino Mixing and Radiative Neutrino Mechanism
|
RevTex, 10 pages including one figure. In Ref.[25], the cited page
number is corrected
|
Phys.Lett.B524:308-318,2002
|
10.1016/S0370-2693(01)01368-5
|
TOKAI-HEP/TH-0106
|
hep-ph
| null |
We find that the presence of a global $L_e-L_\mu-L_\tau$ ($\equiv L^\prime$)
symmetry and an $S_2$ permutation symmetry for the $\mu$- and $\tau$-families
supplemented by a discrete $Z_4$ symmetry naturally leads to almost maximal
atmospheric neutrino mixing and large solar neutrino mixing, which arise,
respectively, from type II seesaw mechanism initiated by an $S_2$-symmetric
triplet Higgs scalar $s$ with $L^\prime=2$ and from radiative mechanism of the
Zee type initiated by two singly charged scalars, an $S_2$-symmetric $h^+$ with
$L^\prime=0$ and an $S_2$-antisymmetric $h^{\prime +}$ with $L^\prime=2$. The
almost maximal mixing for atmospheric neutrinos is explained by the appearance
of the democratic coupling of $s$ to neutrinos ensured by $S_2$ and $Z_4$ while
the large mixing for solar neutrinos is explained by the similarity of $h^+$-
and $h^{\prime +}$-couplings described by $f^h_+\sim f^h_-$ and
$\mu_+\sim\mu_-$, where $f^h_+$ ($f^h_-$) and $\mu_+$ ($\mu_-$) stand for $h^+$
($h^{\prime +}$)-couplings, respectively, to leptons and to Higgs scalars.
|
[
{
"created": "Wed, 24 Oct 2001 15:24:29 GMT",
"version": "v1"
},
{
"created": "Thu, 15 Nov 2001 03:47:07 GMT",
"version": "v2"
},
{
"created": "Fri, 21 Dec 2001 02:32:17 GMT",
"version": "v3"
}
] |
2008-11-26
|
[
[
"Kitabayashi",
"Teruyuki",
""
],
[
"Yasue",
"Masaki",
""
]
] |
We find that the presence of a global $L_e-L_\mu-L_\tau$ ($\equiv L^\prime$) symmetry and an $S_2$ permutation symmetry for the $\mu$- and $\tau$-families supplemented by a discrete $Z_4$ symmetry naturally leads to almost maximal atmospheric neutrino mixing and large solar neutrino mixing, which arise, respectively, from type II seesaw mechanism initiated by an $S_2$-symmetric triplet Higgs scalar $s$ with $L^\prime=2$ and from radiative mechanism of the Zee type initiated by two singly charged scalars, an $S_2$-symmetric $h^+$ with $L^\prime=0$ and an $S_2$-antisymmetric $h^{\prime +}$ with $L^\prime=2$. The almost maximal mixing for atmospheric neutrinos is explained by the appearance of the democratic coupling of $s$ to neutrinos ensured by $S_2$ and $Z_4$ while the large mixing for solar neutrinos is explained by the similarity of $h^+$- and $h^{\prime +}$-couplings described by $f^h_+\sim f^h_-$ and $\mu_+\sim\mu_-$, where $f^h_+$ ($f^h_-$) and $\mu_+$ ($\mu_-$) stand for $h^+$ ($h^{\prime +}$)-couplings, respectively, to leptons and to Higgs scalars.
|
hep-ph/9510380
|
Ivanyi Bela
|
B. Iv\'anyi, Zs. Schram, K. Sailer and W. Greiner
|
Time evolution of the two-jet events $e^+-e^- \to hadrons$ in the
Dynamical String Model
|
5 pages in LaTex format, 11 Postscript figures available by e-mailing
to bela@dtp.atomki.hu
| null |
10.1007/BF03053631
| null |
hep-ph
| null |
The time dependent pion emission rate and the mean life time of the pion
source in the center of mass frame of the two-jet events have been determined
for $e^+-e^- \to hadrons$ at $\sqrt{s} = 20 - 50$ GeV by the Dynamical String
Model. It was established that the time needed for the creation of the pion
source is $5$ fm/c, whereas its life time is $\tau_0 \approx 7 - 13$ fm/c for
energies $\sqrt{s} = 20 - 50$ GeV, respectively.
|
[
{
"created": "Tue, 24 Oct 1995 10:51:58 GMT",
"version": "v1"
}
] |
2022-02-23
|
[
[
"Iványi",
"B.",
""
],
[
"Schram",
"Zs.",
""
],
[
"Sailer",
"K.",
""
],
[
"Greiner",
"W.",
""
]
] |
The time dependent pion emission rate and the mean life time of the pion source in the center of mass frame of the two-jet events have been determined for $e^+-e^- \to hadrons$ at $\sqrt{s} = 20 - 50$ GeV by the Dynamical String Model. It was established that the time needed for the creation of the pion source is $5$ fm/c, whereas its life time is $\tau_0 \approx 7 - 13$ fm/c for energies $\sqrt{s} = 20 - 50$ GeV, respectively.
|
hep-ph/9611302
|
Zack Sullivan
|
Zack Sullivan (U. of Illinois)
|
Supersymmetric QCD correction to top-quark production at the Tevatron
|
To appear Phys. Rev. D, added discussion of some references, two
figures replaced with one, 15 pages, 7 ps figures included
|
Phys.Rev. D56 (1997) 451-457
|
10.1103/PhysRevD.56.451
|
ILL-(TH)-96-13
|
hep-ph
| null |
We calculate the supersymmetric QCD correction to top-quark production at the
Fermilab Tevatron, allowing for arbitrary left-right mixing of the squarks. We
find that the correction is significant for several combinations of gluino and
squark masses, e.g. +33% for m_{\tilde g}=200 GeV, m_{\tilde t} = m_{\tilde q}
=75 GeV.
|
[
{
"created": "Mon, 11 Nov 1996 21:07:07 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Apr 1997 19:41:42 GMT",
"version": "v2"
}
] |
2009-10-30
|
[
[
"Sullivan",
"Zack",
"",
"U. of Illinois"
]
] |
We calculate the supersymmetric QCD correction to top-quark production at the Fermilab Tevatron, allowing for arbitrary left-right mixing of the squarks. We find that the correction is significant for several combinations of gluino and squark masses, e.g. +33% for m_{\tilde g}=200 GeV, m_{\tilde t} = m_{\tilde q} =75 GeV.
|
hep-ph/9504254
|
Gregory Poulis
|
G.I Poulis (NIKHEF) and P.J. Mulders (NIKHEF and Amsterdam Free
University)
|
On the Dirac quantization condition
|
5 pages, uuencoded Z-compressed tar file, includes RevTeX source and
two postscript figures
| null | null |
NIKHEF 95-007
|
hep-ph
| null |
We revisit the Dirac quantization condition for string-like and string-less
(but multi-valued) magnetic monopole potentials. In doing so we allow for an
{\it a priori} different coupling ${\tilde e}$ associated with the longitudinal
components of the gauge potential. By imposing physical criteria in the choice
of the longitudinal--transverse decomposition we show that -in contrast to some
recent claims- the `unphysical' coupling $\tilde e$ does not appear in the
quantization condition.
|
[
{
"created": "Fri, 7 Apr 1995 12:40:59 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Apr 1995 09:22:00 GMT",
"version": "v2"
}
] |
2008-02-03
|
[
[
"Poulis",
"G. I",
"",
"NIKHEF"
],
[
"Mulders",
"P. J.",
"",
"NIKHEF and Amsterdam Free\n University"
]
] |
We revisit the Dirac quantization condition for string-like and string-less (but multi-valued) magnetic monopole potentials. In doing so we allow for an {\it a priori} different coupling ${\tilde e}$ associated with the longitudinal components of the gauge potential. By imposing physical criteria in the choice of the longitudinal--transverse decomposition we show that -in contrast to some recent claims- the `unphysical' coupling $\tilde e$ does not appear in the quantization condition.
|
1805.03295
|
Ernest Ma
|
Ernest Ma (UC Riverside)
|
Leptonic Dark Matter with Scalar Dilepton Mediator
|
12 pages, 4 figures (published version)
| null |
10.1142/S0217732318502267
|
UCRHEP-T591 (May 2018)
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A simple and elegant mechanism is proposed to resolve the problem of having a
light scalar mediator for self-interacting dark matter and the resulting
disruption to the cosmic microwave background (CMB) at late times by the
former's enhanced Sommerfeld production and decay. The crucial idea is to have
Dirac neutrinos with the conservation of U(1) lepton number extended to the
dark sector. The simplest scenario consists of scalar or fermion dark matter
with unit lepton number accompanied by a light scalar dilepton mediator, which
decays to two neutrinos.
|
[
{
"created": "Tue, 8 May 2018 21:27:48 GMT",
"version": "v1"
},
{
"created": "Tue, 15 May 2018 20:54:40 GMT",
"version": "v2"
},
{
"created": "Sat, 5 Jan 2019 19:00:08 GMT",
"version": "v3"
}
] |
2019-01-08
|
[
[
"Ma",
"Ernest",
"",
"UC Riverside"
]
] |
A simple and elegant mechanism is proposed to resolve the problem of having a light scalar mediator for self-interacting dark matter and the resulting disruption to the cosmic microwave background (CMB) at late times by the former's enhanced Sommerfeld production and decay. The crucial idea is to have Dirac neutrinos with the conservation of U(1) lepton number extended to the dark sector. The simplest scenario consists of scalar or fermion dark matter with unit lepton number accompanied by a light scalar dilepton mediator, which decays to two neutrinos.
|
2006.16002
|
Samina S. Masood
|
Samina Masood
|
QED Plasma at Extremely High Temperature and Density
|
12 pages. arXiv admin note: substantial text overlap with
arXiv:1801.07835
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We use the renormalization scheme of QED (Quantum Electrodynamics) in
real-time formalism to calculate the effective parameters of the theory,
indicating the existence of relativistic QED plasma at extremely high
temperatures and extremely high densities. High-density plasma is found inside
the stellar cores and high temperature QED plasma could only exist, right after
the neutrino decoupling temperature in the early universe, before the
nucleosynthesis is complete. Radiation couples with the medium through the
vacuum polarization in a hot and dense medium. Calculating the vacuum
polarization tensor in a medium, the effect of radiation on matter is
investigated in such a medium. We explicitly compute the parameters of QED
plasma such as plasma frequency, Debye shielding length and the propagation
frequency in terms of temperature and density of the superhot and superdense
medium, respectively. This study helps to understand short term existence of
QED plasma in the superhot and superdense systems.
|
[
{
"created": "Thu, 25 Jun 2020 16:01:04 GMT",
"version": "v1"
}
] |
2020-06-30
|
[
[
"Masood",
"Samina",
""
]
] |
We use the renormalization scheme of QED (Quantum Electrodynamics) in real-time formalism to calculate the effective parameters of the theory, indicating the existence of relativistic QED plasma at extremely high temperatures and extremely high densities. High-density plasma is found inside the stellar cores and high temperature QED plasma could only exist, right after the neutrino decoupling temperature in the early universe, before the nucleosynthesis is complete. Radiation couples with the medium through the vacuum polarization in a hot and dense medium. Calculating the vacuum polarization tensor in a medium, the effect of radiation on matter is investigated in such a medium. We explicitly compute the parameters of QED plasma such as plasma frequency, Debye shielding length and the propagation frequency in terms of temperature and density of the superhot and superdense medium, respectively. This study helps to understand short term existence of QED plasma in the superhot and superdense systems.
|
hep-ph/0608223
|
Jin Min Yang
|
Peiying Li, Gongru Lu, Jin Min Yang, Huanjun Zhang
|
Probing R-parity Violating Interactions from Top Quark Polarization at
LHC
|
more comments added (7 pages, 5 figs)
|
Eur.Phys.J.C51:163-168,2007
|
10.1140/epjc/s10052-007-0290-y
| null |
hep-ph hep-ex
| null |
In minimal supersymmetric standard model the R-parity violating interactions
can induce anomalous top pair productions at the LHC through the t-channel
process d_R \bar d_R -> t_L \bar t_L by exchanging a slepton or u-channel
process d_R \bar d_R -> t_R \bar t_R by exchanging a squark. Such top pair
productions with certain chirality cause top quark polarization in the top pair
events. We found that at the LHC, due to the large statistics, the statistical
significance of the polarization observable and thus the probing ability for
the corresponding R-parity violating couplings are much higher than at the
Tevatron upgrade.
|
[
{
"created": "Sun, 20 Aug 2006 06:42:59 GMT",
"version": "v1"
},
{
"created": "Sat, 24 Feb 2007 13:37:33 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Li",
"Peiying",
""
],
[
"Lu",
"Gongru",
""
],
[
"Yang",
"Jin Min",
""
],
[
"Zhang",
"Huanjun",
""
]
] |
In minimal supersymmetric standard model the R-parity violating interactions can induce anomalous top pair productions at the LHC through the t-channel process d_R \bar d_R -> t_L \bar t_L by exchanging a slepton or u-channel process d_R \bar d_R -> t_R \bar t_R by exchanging a squark. Such top pair productions with certain chirality cause top quark polarization in the top pair events. We found that at the LHC, due to the large statistics, the statistical significance of the polarization observable and thus the probing ability for the corresponding R-parity violating couplings are much higher than at the Tevatron upgrade.
|
hep-ph/9412222
|
PostDoc Its
|
N. Deshpande, Xiao-Gang He and Josip Trampetic
|
Long Distance Contributions to Penguin Processes $b\rightarrow s\gamma$
and $b\rightarrow d \gamma$
|
13 pages, Revtex. Some numerical errors in the calculation of
$b\rightarrow d \gamma$ are corrected. The long distance contribution to
$b\rightarrow d \gamma$ is smaller than stated in the earlier version. New
estimate due to u and c loop contributions to the short distance
$b\rightarrow d\gamma$ amplitude are included
|
Phys.Lett. B367 (1996) 362-368
|
10.1016/0370-2693(95)01364-4
|
OITS-564
|
hep-ph
| null |
We consider the long distance contributions to inclusive penguin processes
through processes like $b\rightarrow s V$ and $b\rightarrow d V$ where $V$ are
$^3S_1(c\bar c)$ states $\psi_i$ in the former case and include $\rho$,
$\omega$ for the latter case. We carefully examine vector dominance for $\bar c
c$ states, and conclude that there is a large suppression of $\psi\sim \gamma$
transition when $\psi$ is at $q^2 = 0$. The long distance effects can be at
most 10\% in both the amplitudes for $b\rightarrow s\gamma$ and $b\rightarrow d
\gamma$. Although the long distance contributions are small, the ratio
$BR(b\rightarrow d\gamma)/BR(b \rightarrow s \gamma) = |V_{td}/V_{ts}|^2$ does
not hold due to significant $u$ and $c$ loop contributions to the short
distance $b\rightarrow d\gamma$ amplitudes .
|
[
{
"created": "Fri, 2 Dec 1994 23:26:55 GMT",
"version": "v1"
},
{
"created": "Fri, 23 Dec 1994 23:38:47 GMT",
"version": "v2"
},
{
"created": "Mon, 23 Jan 1995 22:29:11 GMT",
"version": "v3"
}
] |
2009-10-28
|
[
[
"Deshpande",
"N.",
""
],
[
"He",
"Xiao-Gang",
""
],
[
"Trampetic",
"Josip",
""
]
] |
We consider the long distance contributions to inclusive penguin processes through processes like $b\rightarrow s V$ and $b\rightarrow d V$ where $V$ are $^3S_1(c\bar c)$ states $\psi_i$ in the former case and include $\rho$, $\omega$ for the latter case. We carefully examine vector dominance for $\bar c c$ states, and conclude that there is a large suppression of $\psi\sim \gamma$ transition when $\psi$ is at $q^2 = 0$. The long distance effects can be at most 10\% in both the amplitudes for $b\rightarrow s\gamma$ and $b\rightarrow d \gamma$. Although the long distance contributions are small, the ratio $BR(b\rightarrow d\gamma)/BR(b \rightarrow s \gamma) = |V_{td}/V_{ts}|^2$ does not hold due to significant $u$ and $c$ loop contributions to the short distance $b\rightarrow d\gamma$ amplitudes .
|
hep-ph/9406324
| null |
S. Dawson and G. Valencia
|
Bounds on $g_5^Z$ from Precision LEP Measurements
|
Phys. Lett. B333 (1994) 207. A few minor errors in the table are
corrected and updated experimental and theoretical numbers are used. The
conclusions are unchanged. These changes will appear in an erratum to the
published paper
|
Phys.Lett. B333 (1994) 207-211
|
10.1016/0370-2693(94)91031-6
| null |
hep-ph
| null |
The parity violating but CP conserving anomalous three-gauge-boson coupling
$g_5^Z$ induces a universal contribution to the left-handed coupling of the $Z$
boson to fermions. We find that the LEP measurements of the partial $Z$ widths
and lepton forward-backward asymmetries are sufficiently precise to place a
bound of order $|g_5^Z|$ less than $\sim~10\%$. This bound is significantly
better than what can be obtained at present from rare $K$ and $B$ meson decays.
|
[
{
"created": "Thu, 16 Jun 1994 22:35:32 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Oct 1994 15:56:52 GMT",
"version": "v2"
}
] |
2009-10-28
|
[
[
"Dawson",
"S.",
""
],
[
"Valencia",
"G.",
""
]
] |
The parity violating but CP conserving anomalous three-gauge-boson coupling $g_5^Z$ induces a universal contribution to the left-handed coupling of the $Z$ boson to fermions. We find that the LEP measurements of the partial $Z$ widths and lepton forward-backward asymmetries are sufficiently precise to place a bound of order $|g_5^Z|$ less than $\sim~10\%$. This bound is significantly better than what can be obtained at present from rare $K$ and $B$ meson decays.
|
1211.7261
|
Sourav Mandal
|
Biplob Bhattacherjee, Sourav K. Mandal and Mihoko Nojiri
|
Top Polarization and Stop Mixing from Boosted Jet Substructure
|
Corresponds to published version
|
JHEP 1303 (2013) 105
|
10.1007/JHEP03(2013)105
|
IPMU12-0200
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Top polarization is an important probe of new physics that couples to the top
sector, and which may be discovered at the 14 TeV LHC. Taking the example of
the MSSM, we argue that top polarization measurements can put a constraint on
the soft supersymmetry breaking parameter A_t. In light of the recent discovery
of a Higgs-like boson of mass ~125 GeV, a large A_t is a prediction of many
supersymmetric models. To this end, we develop a *detector level* analysis
methodology for extracting polarization information from hadronic tops using
boosted jet substructure. We show that with 100 fb^(-1) of data, left and right
600 GeV stops can be distinguished to 4\sigma, and 800 GeV stops can be
distinguished to 3\sigma.
|
[
{
"created": "Fri, 30 Nov 2012 14:06:45 GMT",
"version": "v1"
},
{
"created": "Sun, 24 Mar 2013 11:38:45 GMT",
"version": "v2"
}
] |
2013-03-28
|
[
[
"Bhattacherjee",
"Biplob",
""
],
[
"Mandal",
"Sourav K.",
""
],
[
"Nojiri",
"Mihoko",
""
]
] |
Top polarization is an important probe of new physics that couples to the top sector, and which may be discovered at the 14 TeV LHC. Taking the example of the MSSM, we argue that top polarization measurements can put a constraint on the soft supersymmetry breaking parameter A_t. In light of the recent discovery of a Higgs-like boson of mass ~125 GeV, a large A_t is a prediction of many supersymmetric models. To this end, we develop a *detector level* analysis methodology for extracting polarization information from hadronic tops using boosted jet substructure. We show that with 100 fb^(-1) of data, left and right 600 GeV stops can be distinguished to 4\sigma, and 800 GeV stops can be distinguished to 3\sigma.
|
1012.2875
|
Marco Serone
|
Giuliano Panico, Mahmoud Safari and Marco Serone
|
Simple and Realistic Composite Higgs Models in Flat Extra Dimensions
|
30 figures, 9 figures; v2: minor improvements, one reference added,
version to appear in JHEP
|
JHEP 1102:103,2011
|
10.1007/JHEP02(2011)103
|
SISSA-85/2010/EP
|
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We construct new composite Higgs/gauge-Higgs unification (GHU) models in flat
space that overcome all the difficulties found in the past in attempting to
construct models of this sort. The key ingredient is the introduction of large
boundary kinetic terms for gauge (and fermion) fields. We focus our analysis on
the electroweak symmetry breaking pattern and the electroweak precision tests
and show how both are compatible with each other. Our models can be seen as
effective TeV descriptions of analogue warped models. We point out that, as far
as electroweak TeV scale physics is concerned, one can rely on simple and more
flexible flat space models rather than considering their unavoidably more
complicated warped space counterparts. The generic collider signatures of our
models are essentially undistinguishable from those expected from composite
Higgs/warped GHU models, namely a light Higgs, colored fermion resonances below
the TeV scale and sizable deviations to the Higgs and top coupling.
|
[
{
"created": "Mon, 13 Dec 2010 21:05:29 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Feb 2011 08:37:30 GMT",
"version": "v2"
}
] |
2011-03-18
|
[
[
"Panico",
"Giuliano",
""
],
[
"Safari",
"Mahmoud",
""
],
[
"Serone",
"Marco",
""
]
] |
We construct new composite Higgs/gauge-Higgs unification (GHU) models in flat space that overcome all the difficulties found in the past in attempting to construct models of this sort. The key ingredient is the introduction of large boundary kinetic terms for gauge (and fermion) fields. We focus our analysis on the electroweak symmetry breaking pattern and the electroweak precision tests and show how both are compatible with each other. Our models can be seen as effective TeV descriptions of analogue warped models. We point out that, as far as electroweak TeV scale physics is concerned, one can rely on simple and more flexible flat space models rather than considering their unavoidably more complicated warped space counterparts. The generic collider signatures of our models are essentially undistinguishable from those expected from composite Higgs/warped GHU models, namely a light Higgs, colored fermion resonances below the TeV scale and sizable deviations to the Higgs and top coupling.
|
1612.00643
|
Jeremie Quevillon
|
J\'er\'emie Quevillon
|
Searching for New Physics in Scalar Top-Pair Resonance
|
Talk given at the 9th International Workshop on Top Quark Physics
(TOP 2016), 19-23 September 2016, Olomouc, Czech Republic, to appear in the
proceedings
| null | null |
KCL-PH-TH/2016-67
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider the effects in the production via gluon fusion in LHC collisions
of one or two spin-zero new resonant particles $\Phi$ that decay into a top
quark pair. We revisit previous analyses of the interferences between the
heavy-fermion loop-induced $gg \rightarrow \Phi \rightarrow t\bar{t}$ signal
and the continuum QCD background $gg \rightarrow t\bar{t}$. We show that in the
presence of standard model fermions only in the $gg \rightarrow \Phi$ loops,
the interference effect is destructive causing a dip in the $t \bar t$ mass
distribution. Including New Physics such as additional vector-like quarks leads
to a totally different picture as the line-shape can be distorted by peaks and
dips. For the time being, the absence of such effects in ATLAS and CMS data
constrain models of the production and decays of the $\Phi$ state(s).
|
[
{
"created": "Fri, 2 Dec 2016 11:46:47 GMT",
"version": "v1"
}
] |
2016-12-05
|
[
[
"Quevillon",
"Jérémie",
""
]
] |
We consider the effects in the production via gluon fusion in LHC collisions of one or two spin-zero new resonant particles $\Phi$ that decay into a top quark pair. We revisit previous analyses of the interferences between the heavy-fermion loop-induced $gg \rightarrow \Phi \rightarrow t\bar{t}$ signal and the continuum QCD background $gg \rightarrow t\bar{t}$. We show that in the presence of standard model fermions only in the $gg \rightarrow \Phi$ loops, the interference effect is destructive causing a dip in the $t \bar t$ mass distribution. Including New Physics such as additional vector-like quarks leads to a totally different picture as the line-shape can be distorted by peaks and dips. For the time being, the absence of such effects in ATLAS and CMS data constrain models of the production and decays of the $\Phi$ state(s).
|
hep-ph/0609072
|
Pietro Colangelo
|
P. Colangelo, F. De Fazio, R. Ferrandes
|
Two topics for a discussion on the $b \bar s$ and $b \bar q$ systems
|
6 pages, 1 figure. Invited talk at the First Workshop on Theory,
Phenomenology and Experiments in Heavy Flavour Physics, Anacapri, Italy, May
29-31, 2006 - v2: two misprints corrected
| null |
10.1016/j.nuclphysbps.2006.09.005
|
BARI-TH/06-540
|
hep-ph
| null |
The analysis of the $b \bar s$ system is an important issue in the Physics
programs of the hadron colliders. We discuss two different topics: the
structure of the orbitally excited states and prediction of the rates of a
class of non leptonic $B_s$ decays.
|
[
{
"created": "Thu, 7 Sep 2006 09:23:52 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Dec 2006 11:09:11 GMT",
"version": "v2"
}
] |
2009-11-11
|
[
[
"Colangelo",
"P.",
""
],
[
"De Fazio",
"F.",
""
],
[
"Ferrandes",
"R.",
""
]
] |
The analysis of the $b \bar s$ system is an important issue in the Physics programs of the hadron colliders. We discuss two different topics: the structure of the orbitally excited states and prediction of the rates of a class of non leptonic $B_s$ decays.
|
hep-ph/9305233
|
Jan Willem Bos
|
J.W. Bos and J.H. Koch
|
The off-Shell Electromagnetic Vertex of the Nucleon in Chiral
Perturbation Theory
|
12 pages (LaTeX), 1 figure (available upon request), NIKHEF 93-P1
|
Nucl.Phys. A563 (1993) 539-548
|
10.1016/0375-9474(93)90054-2
| null |
hep-ph
| null |
We study the electromagnetic vertex of a nucleon in next-to-leading order
chiral perturbation theory (CPT). We consider the case where one of the
nucleons at the $\gamma$NN vertex is off its mass shell. We define relevant
measures for the off-shell dependence in the limited kinematical range allowed,
and analyze their expansion in the pion mass. The leading nonanalytic
contributions are calculated to estimate their size.
|
[
{
"created": "Mon, 10 May 1993 11:15:41 GMT",
"version": "v1"
}
] |
2009-10-22
|
[
[
"Bos",
"J. W.",
""
],
[
"Koch",
"J. H.",
""
]
] |
We study the electromagnetic vertex of a nucleon in next-to-leading order chiral perturbation theory (CPT). We consider the case where one of the nucleons at the $\gamma$NN vertex is off its mass shell. We define relevant measures for the off-shell dependence in the limited kinematical range allowed, and analyze their expansion in the pion mass. The leading nonanalytic contributions are calculated to estimate their size.
|
1803.11127
|
Vasily Sotnikov
|
F. R. Anger, V. Sotnikov
|
On the Dimensional Regularization of QCD Helicity Amplitudes With Quarks
|
Some minor changes regarding the presentation of the relation to the
FDF approach
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study QCD helicity amplitudes with an arbitrary number of (massive)
quarks, keeping unobserved (loop) particles in fixed integer $D_s$ dimensions.
We find a suitable embedding of external four-dimensional fermion states into
higher dimensional spaces. This allows to identify the $D_s$ dependence of
amplitudes with external quarks at one and two loops, permitting an analytic
continuation in $D_s$. Explicitly we focus on 't Hooft-Veltman and
four-dimensional helicity schemes for which we provide a compact prescription
for the computation of one- and two-loop amplitudes amenable for numerical
implementation.
|
[
{
"created": "Thu, 29 Mar 2018 15:57:23 GMT",
"version": "v1"
},
{
"created": "Fri, 13 Apr 2018 17:11:53 GMT",
"version": "v2"
}
] |
2018-04-16
|
[
[
"Anger",
"F. R.",
""
],
[
"Sotnikov",
"V.",
""
]
] |
We study QCD helicity amplitudes with an arbitrary number of (massive) quarks, keeping unobserved (loop) particles in fixed integer $D_s$ dimensions. We find a suitable embedding of external four-dimensional fermion states into higher dimensional spaces. This allows to identify the $D_s$ dependence of amplitudes with external quarks at one and two loops, permitting an analytic continuation in $D_s$. Explicitly we focus on 't Hooft-Veltman and four-dimensional helicity schemes for which we provide a compact prescription for the computation of one- and two-loop amplitudes amenable for numerical implementation.
|
1608.01673
|
Venus Keus
|
A. Cordero-Cid, J. Hern\'andez-S\'anchez, V. Keus, S. F. King, S.
Moretti, D. Rojas, D. Soko{\l}owska
|
CP violating scalar Dark Matter
|
42 pages, 22 figures
| null |
10.1007/JHEP12(2016)014
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study an extension of the Standard Model (SM) in which two copies of the
SM scalar $SU(2)$ doublet which do not acquire a Vacuum Expectation Value
(VEV), and hence are \textit{inert}, are added to the scalar sector. We allow
for CP-violation in the \textit{inert} sector, where the lightest
\textit{inert} state is protected from decaying to SM particles through the
conservation of a $Z_2$ symmetry. The lightest neutral particle from the
\textit{inert} sector, which has a mixed CP-charge due to CP-violation, is
hence a Dark Matter (DM) candidate. We discuss the new regions of DM relic
density opened up by CP-violation, and compare our results to the CP-conserving
limit and the Inert Doublet Model (IDM). We constrain the parameter space of
the CP-violating model using recent results from the Large Hadron Collider
(LHC) and DM direct and indirect detection experiments.
|
[
{
"created": "Thu, 4 Aug 2016 20:00:00 GMT",
"version": "v1"
}
] |
2016-12-21
|
[
[
"Cordero-Cid",
"A.",
""
],
[
"Hernández-Sánchez",
"J.",
""
],
[
"Keus",
"V.",
""
],
[
"King",
"S. F.",
""
],
[
"Moretti",
"S.",
""
],
[
"Rojas",
"D.",
""
],
[
"Sokołowska",
"D.",
""
]
] |
We study an extension of the Standard Model (SM) in which two copies of the SM scalar $SU(2)$ doublet which do not acquire a Vacuum Expectation Value (VEV), and hence are \textit{inert}, are added to the scalar sector. We allow for CP-violation in the \textit{inert} sector, where the lightest \textit{inert} state is protected from decaying to SM particles through the conservation of a $Z_2$ symmetry. The lightest neutral particle from the \textit{inert} sector, which has a mixed CP-charge due to CP-violation, is hence a Dark Matter (DM) candidate. We discuss the new regions of DM relic density opened up by CP-violation, and compare our results to the CP-conserving limit and the Inert Doublet Model (IDM). We constrain the parameter space of the CP-violating model using recent results from the Large Hadron Collider (LHC) and DM direct and indirect detection experiments.
|
0708.3731
|
Andreas Vogt
|
S. Moch, M. Rogal (DESY, Zeuthen), A. Vogt (Liverpool Univ.)
|
Differences between charged-current coefficient functions
|
20 pages, LaTeX, 4 eps-figures
|
Nucl.Phys.B790:317-335,2008
|
10.1016/j.nuclphysb.2007.09.022
|
DESY 07-048, SFT/CPP-07-13, LTH 756
|
hep-ph
| null |
Second- and third-order results are presented for the structure functions of
charged-current deep-inelastic scattering in the framework of massless
perturbative QCD. We write down the two-loop differences between the
corresponding crossing-even and -odd coefficient functions, including those for
the longitudinal structure function not covered in the literature so far. At
three loops we compute the lowest five moments of these differences for all
three structure functions and provide approximate expressions in Bjorken-$x$
space. Also calculated is the related third-order coefficient-function
correction to the Gottfried sum rule. We confirm the conjectured suppression of
these quantities if the number of colours is large. Finally we derive the
second- and third-order QCD contributions to the Paschos-Wolfenstein ratio used
for the determination of the weak mixing angle from neutrino-nucleon
deep-inelastic scattering. These contributions are found to be small.
|
[
{
"created": "Tue, 28 Aug 2007 09:01:21 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Moch",
"S.",
"",
"DESY, Zeuthen"
],
[
"Rogal",
"M.",
"",
"DESY, Zeuthen"
],
[
"Vogt",
"A.",
"",
"Liverpool Univ."
]
] |
Second- and third-order results are presented for the structure functions of charged-current deep-inelastic scattering in the framework of massless perturbative QCD. We write down the two-loop differences between the corresponding crossing-even and -odd coefficient functions, including those for the longitudinal structure function not covered in the literature so far. At three loops we compute the lowest five moments of these differences for all three structure functions and provide approximate expressions in Bjorken-$x$ space. Also calculated is the related third-order coefficient-function correction to the Gottfried sum rule. We confirm the conjectured suppression of these quantities if the number of colours is large. Finally we derive the second- and third-order QCD contributions to the Paschos-Wolfenstein ratio used for the determination of the weak mixing angle from neutrino-nucleon deep-inelastic scattering. These contributions are found to be small.
|
hep-ph/9705250
|
Jim Huang
|
Zheng Huang, Hung Jung Lu and Ina Sarcevic
|
Partonic Picture of Nuclear Shadowing at Small x
|
15 two-column pages in RevTeX with 9 eps figures
|
Nucl.Phys. A637 (1998) 79-106
|
10.1016/S0375-9474(98)00210-3
|
AZPH-TH/97-07
|
hep-ph nucl-th
| null |
We investigate the nuclear shadowing mechanism in the context of perturbative
QCD and the Glauber multiple scattering model. Using recent HERA data on
nucleon structure function at small $x$, we put stringent constrains on the
nucleon gluon density in the double-logarithm approximation. We suggest that
the scaling violation of the nucleon structure function in the region of small
$x$ and semihard scale $Q^2$ can be reliably described by perturbative QCD
which is a central key to the understanding of the scale dependence of the
nuclear shadowing effect. Our results indicate that while the shadowing of the
quark density arises from an interplay between the ``soft'' and semihard QCD
processes, the gluon shadowing is largely driven by a perturbative shadowing
mechanism. We demonstrate that the gluon shadowing is a robust phenomenon at
large $Q^2$ and can be unambiguously predicted by perturbative QCD.
|
[
{
"created": "Tue, 6 May 1997 20:26:14 GMT",
"version": "v1"
}
] |
2009-10-30
|
[
[
"Huang",
"Zheng",
""
],
[
"Lu",
"Hung Jung",
""
],
[
"Sarcevic",
"Ina",
""
]
] |
We investigate the nuclear shadowing mechanism in the context of perturbative QCD and the Glauber multiple scattering model. Using recent HERA data on nucleon structure function at small $x$, we put stringent constrains on the nucleon gluon density in the double-logarithm approximation. We suggest that the scaling violation of the nucleon structure function in the region of small $x$ and semihard scale $Q^2$ can be reliably described by perturbative QCD which is a central key to the understanding of the scale dependence of the nuclear shadowing effect. Our results indicate that while the shadowing of the quark density arises from an interplay between the ``soft'' and semihard QCD processes, the gluon shadowing is largely driven by a perturbative shadowing mechanism. We demonstrate that the gluon shadowing is a robust phenomenon at large $Q^2$ and can be unambiguously predicted by perturbative QCD.
|
2204.07511
|
Kei Yagyu
|
Shinya Kanemura, Kei Yagyu
|
Implication of the $W$ boson mass anomaly at CDF II in the Higgs triplet
model with a mass difference
|
Version accepted for publication in PLB
| null |
10.1016/j.physletb.2022.137217
|
OU-HET-1141
|
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
A new report for the measurement of the W boson mass has been provided by the
CDF II experiment. The measured value of the W boson mass is given to be
$m_W^{\text{CDF II}} = 80.4335 \pm 0.0094$ GeV which shows $7\sigma$ deviation
from the standard model prediction, while the other groups of high energy
experiments, e.g., ATLAS and D0 II, show consistent results with the latter.
Assuming that the measurement at CDF II is correct, we discuss the possibility
to explain the anomaly in the Higgs triplet model. We find that the anomaly can
be explained under the constraints from the electroweak rho parameter, the
effective weak mixing angle, the partial width of the leptonic $Z$ decay and
current direct searches at LHC when non-zero mass differences among the
triplet-like Higgs bosons and the vacuum expectation value of the triplet Higgs
field are taken to be ${\cal O}(100)$ GeV and ${\cal O}(1)$ GeV, respectively.
|
[
{
"created": "Fri, 15 Apr 2022 15:13:29 GMT",
"version": "v1"
},
{
"created": "Tue, 31 May 2022 01:39:45 GMT",
"version": "v2"
}
] |
2022-06-08
|
[
[
"Kanemura",
"Shinya",
""
],
[
"Yagyu",
"Kei",
""
]
] |
A new report for the measurement of the W boson mass has been provided by the CDF II experiment. The measured value of the W boson mass is given to be $m_W^{\text{CDF II}} = 80.4335 \pm 0.0094$ GeV which shows $7\sigma$ deviation from the standard model prediction, while the other groups of high energy experiments, e.g., ATLAS and D0 II, show consistent results with the latter. Assuming that the measurement at CDF II is correct, we discuss the possibility to explain the anomaly in the Higgs triplet model. We find that the anomaly can be explained under the constraints from the electroweak rho parameter, the effective weak mixing angle, the partial width of the leptonic $Z$ decay and current direct searches at LHC when non-zero mass differences among the triplet-like Higgs bosons and the vacuum expectation value of the triplet Higgs field are taken to be ${\cal O}(100)$ GeV and ${\cal O}(1)$ GeV, respectively.
|
0806.1751
|
Arkady Vainshtein
|
S.G. Karshenboim, V.A. Shelyuto, and A.I. Vainshtein
|
Hadronic Light-by-Light Scattering in the Muonium Hyperfine Splitting
|
16 pages, 7 figures, a reference added
|
Phys.Rev.D78:065036,2008
|
10.1103/PhysRevD.78.065036
|
FTPI-MINN-08/21, UMN-TH-2609/07, CERN-PH-TH/2008-126
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider an impact of hadronic light-by-light scattering on the muonium
hyperfine structure. A shift of the hyperfine interval $\Delta \nu({\rm Mu})
_{\rm\tiny HLBL}$ is calculated with the light-by-light scattering approximated
by exchange of pseudoscalar and pseudovector mesons. Constraints from the
operator product expansion in QCD are used to fix parameters of the model
similar to the one used earlier for the hadronic light-by-light scattering in
calculations of the muon anomalous magnetic moment. The pseudovector exchange
is dominant in the resulting shift, $\Delta \nu({\rm Mu})_{\rm\tiny HLBL}=
-0.0065(10) {Hz}$. Although the effect is tiny it is useful in understanding
the level of hadronic uncertainties.
|
[
{
"created": "Tue, 10 Jun 2008 20:36:21 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Jul 2008 22:45:00 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Karshenboim",
"S. G.",
""
],
[
"Shelyuto",
"V. A.",
""
],
[
"Vainshtein",
"A. I.",
""
]
] |
We consider an impact of hadronic light-by-light scattering on the muonium hyperfine structure. A shift of the hyperfine interval $\Delta \nu({\rm Mu}) _{\rm\tiny HLBL}$ is calculated with the light-by-light scattering approximated by exchange of pseudoscalar and pseudovector mesons. Constraints from the operator product expansion in QCD are used to fix parameters of the model similar to the one used earlier for the hadronic light-by-light scattering in calculations of the muon anomalous magnetic moment. The pseudovector exchange is dominant in the resulting shift, $\Delta \nu({\rm Mu})_{\rm\tiny HLBL}= -0.0065(10) {Hz}$. Although the effect is tiny it is useful in understanding the level of hadronic uncertainties.
|
hep-ph/0311176
|
Alexander Studenikin
|
Maxim Dvornikov, Alexander Studenikin
|
There is no mass squared term in neutrino electric charge
| null | null | null | null |
hep-ph
| null |
We claim that the neutrino mass squared term cannot appear in the expansion
of the neutrino electric charge over the neutrino mass parameter at the
one-loop level of the standard model supplied with $\mathrm{SU}(2)$-singlet
right-handed neutrino.
|
[
{
"created": "Thu, 13 Nov 2003 18:36:05 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Dvornikov",
"Maxim",
""
],
[
"Studenikin",
"Alexander",
""
]
] |
We claim that the neutrino mass squared term cannot appear in the expansion of the neutrino electric charge over the neutrino mass parameter at the one-loop level of the standard model supplied with $\mathrm{SU}(2)$-singlet right-handed neutrino.
|
0908.2197
|
Simonetta Liuti
|
Simonetta Liuti and Gary R. Goldstein
|
Accessing Generalized Transversity Distributions with Exclusive $\pi^o$
Electroproduction
|
5 pages, 3 figures, to appear in the proceedings of DIS 2009, 26-30
April 2009, Madrid
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Exclusive $\pi^0$ electroproduction from nucleons at large $Q^2$ can be
described by Generalized Parton Distributions (GPDs), particularly the chiral
odd subset related to transversity. These GPDs can be accessed experimentally
from various cross sections and asymmetries. We calculate these GPDs in a
spectator model, constrained by boundary functions. Alternatively, in a
hadronic picture the meson production amplitudes correspond to C-odd Regge
exchanges with final state interactions. The helicity structure provides
relations between the partonic and the hadronic, Regge description of C-odd,
chiral-odd processes. Calculations show how the tensor charge and other
transversity parameters can be
|
[
{
"created": "Sat, 15 Aug 2009 20:51:17 GMT",
"version": "v1"
}
] |
2009-08-18
|
[
[
"Liuti",
"Simonetta",
""
],
[
"Goldstein",
"Gary R.",
""
]
] |
Exclusive $\pi^0$ electroproduction from nucleons at large $Q^2$ can be described by Generalized Parton Distributions (GPDs), particularly the chiral odd subset related to transversity. These GPDs can be accessed experimentally from various cross sections and asymmetries. We calculate these GPDs in a spectator model, constrained by boundary functions. Alternatively, in a hadronic picture the meson production amplitudes correspond to C-odd Regge exchanges with final state interactions. The helicity structure provides relations between the partonic and the hadronic, Regge description of C-odd, chiral-odd processes. Calculations show how the tensor charge and other transversity parameters can be
|
hep-ph/9603367
| null |
Fuguang Cao (ITP) and T. Huang (BIHEP)
|
Perturbative QCD study on the photonic penguin contributions to the
decay $B\to K^* \gamma$
|
13 pages, latex, 2 PostScript figures, more meson wave function
models are employed in numerical calculation, the text is revised
substantially, to be published in Z. Phys. C
|
Eur.Phys.J.C4:277-281,1998
|
10.1007/s100520050205
| null |
hep-ph
| null |
Including corrections of order $O(m_{K^*}/m_B)$, we present an analysis of
photonic penguin contributions to the decay $B\to K^* \gamma$ in the
perturbative QCD framework. Employing several models of the meson wave
functions, we demonstrate that the corrections of $O(m_{K^*}/m_B)$ are enhanced
and will providesubstantial contributions to the decay because of the B meson
wave function being sharply peaked (bound state effect). The numerical
predictions for the corrections are about $30%\sim 60%$ which depend on the
non-perturbative inputs such as the meson wave functions and the $b$-quark
mass.
|
[
{
"created": "Thu, 21 Mar 1996 23:41:02 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Oct 1997 08:41:00 GMT",
"version": "v2"
}
] |
2011-09-13
|
[
[
"Cao",
"Fuguang",
"",
"ITP"
],
[
"Huang",
"T.",
"",
"BIHEP"
]
] |
Including corrections of order $O(m_{K^*}/m_B)$, we present an analysis of photonic penguin contributions to the decay $B\to K^* \gamma$ in the perturbative QCD framework. Employing several models of the meson wave functions, we demonstrate that the corrections of $O(m_{K^*}/m_B)$ are enhanced and will providesubstantial contributions to the decay because of the B meson wave function being sharply peaked (bound state effect). The numerical predictions for the corrections are about $30%\sim 60%$ which depend on the non-perturbative inputs such as the meson wave functions and the $b$-quark mass.
|
hep-ph/9507455
|
Manuel Perez-Victoria
|
F. del Aguila, M. Masip and M. Perez-Victoria
|
Physical Parameters and Renormalization of U(1)_a x U(1)_b Models
|
24 pages, tex, 1 figure
|
Nucl.Phys. B456 (1995) 531-549
|
10.1016/0550-3213(95)00511-6
|
UG-FT-46/94
|
hep-ph
| null |
We analize the structure of models with unbroken and spontaneously broken
U(1)_a x U(1)_b gauge symmetry. We show that the quantum corrections to the 2N
gauge charges, with N = #fermions + #scalars, can be absorbed in the
redefinition of three independent gauge couplings (g_a,g_b and g_ab). We
establish the (one-loop) conditions on the matter cotent for g_ab= = 0 (a value
usually assumed in the literature) and we show that in the minimal extensions
of the Standard Model with an extra U(1) symmetry the choice g_ab = 0 is not
stable under radiative corrections induced by the standard Higgs fields.
Moreover, g_ab = 0 to all orders seems to require an exact symmetry. The
spontaneous breaking of the gauge symmetry induces further mixing between the
two gauge bosons and introduces a fourth independent physical parameter. A
consequence of our analysis is that the usual tree-level description with only
three physical parameters (i.e., two gauge couplings and one gauge boson mixing
angle) is not in general a justified zero order limit of the treatment
including radiative corrections.
|
[
{
"created": "Mon, 31 Jul 1995 11:09:26 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Aug 1995 10:21:10 GMT",
"version": "v2"
}
] |
2009-10-28
|
[
[
"del Aguila",
"F.",
""
],
[
"Masip",
"M.",
""
],
[
"Perez-Victoria",
"M.",
""
]
] |
We analize the structure of models with unbroken and spontaneously broken U(1)_a x U(1)_b gauge symmetry. We show that the quantum corrections to the 2N gauge charges, with N = #fermions + #scalars, can be absorbed in the redefinition of three independent gauge couplings (g_a,g_b and g_ab). We establish the (one-loop) conditions on the matter cotent for g_ab= = 0 (a value usually assumed in the literature) and we show that in the minimal extensions of the Standard Model with an extra U(1) symmetry the choice g_ab = 0 is not stable under radiative corrections induced by the standard Higgs fields. Moreover, g_ab = 0 to all orders seems to require an exact symmetry. The spontaneous breaking of the gauge symmetry induces further mixing between the two gauge bosons and introduces a fourth independent physical parameter. A consequence of our analysis is that the usual tree-level description with only three physical parameters (i.e., two gauge couplings and one gauge boson mixing angle) is not in general a justified zero order limit of the treatment including radiative corrections.
|
hep-ph/0101326
|
Roberto Casalbuoni
|
R. Casalbuoni, R. Gatto, M. Mannarelli and G. Nardulli
|
Effective Field Theory for the Crystalline Colour Superconductive Phase
of QCD
|
Latex, 17 pages, Modifications in the effective goldstone boson
description
|
Phys.Lett.B511:218-228,2001
|
10.1016/S0370-2693(01)00645-1
| null |
hep-ph astro-ph hep-th nucl-th
| null |
We present an effective field theory for high density, low temperature QCD in
the crystalline colour superconductive phase (LOFF phase). This interesting
phase of QCD is characterized by a gap parameter with a crystalline pattern,
breaking traslational and rotational invariance, and could have astrophysical
applications. In the effective theory the fermions have a Majorana mass, which,
besides colour, breaks translation and rotation symmetries. Fermions couple to
the three phonons arising from the breaking of rotation and translation
invariance. Integrating out the fermions leads eventually to an effective
lagrangian in terms of the phonon fields only, which satisfies an anisotropic
dispersion relation.
|
[
{
"created": "Mon, 29 Jan 2001 16:23:41 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Mar 2001 09:05:37 GMT",
"version": "v2"
},
{
"created": "Sun, 20 May 2001 20:34:13 GMT",
"version": "v3"
}
] |
2010-11-19
|
[
[
"Casalbuoni",
"R.",
""
],
[
"Gatto",
"R.",
""
],
[
"Mannarelli",
"M.",
""
],
[
"Nardulli",
"G.",
""
]
] |
We present an effective field theory for high density, low temperature QCD in the crystalline colour superconductive phase (LOFF phase). This interesting phase of QCD is characterized by a gap parameter with a crystalline pattern, breaking traslational and rotational invariance, and could have astrophysical applications. In the effective theory the fermions have a Majorana mass, which, besides colour, breaks translation and rotation symmetries. Fermions couple to the three phonons arising from the breaking of rotation and translation invariance. Integrating out the fermions leads eventually to an effective lagrangian in terms of the phonon fields only, which satisfies an anisotropic dispersion relation.
|
1608.06945
|
Tim Stefaniak
|
Stefano Profumo, Tim Stefaniak
|
Alignment without Decoupling: the Portal to Light Dark Matter in the
MSSM
|
9 pages, 2 figures, 3 tables; v2: minor changes, added discussion of
dominant annihilation final states, matches published version in PRD
|
Phys.Rev. D94 (2016) no.9, 095020
|
10.1103/PhysRevD.94.095020
|
SCIPP 16/12
|
hep-ph astro-ph.HE hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study light, thermal neutralino dark matter in the sub-GeV to 65 GeV mass
range in the Minimal Supersymmetric extension of the Standard Model (MSSM). We
consider realizations of the limit of alignment without decoupling in the Higgs
sector where the heavier CP-even Higgs impersonates the observed Higgs state at
125 GeV, while the lighter CP-even Higgs is the mediator of dark matter
annihilation. We single out three distinct and novel possibilities for light
dark matter: (i) a neutralino with mass around half the light Higgs mass, in
the sub-GeV to 30 GeV mass range; (ii) a neutralino with a mass around half the
pseudoscalar Higgs boson mass, in our examples around 60 to 65 GeV; (iii) a
very light neutralino with mass around the light Higgs mass, pair-annihilating
to Higgs pairs. We discuss the implications of all these possibilities for
indirect and direct dark matter detection experiments, and we demonstrate that
all scenarios will be tested by next generation direct detection experiments.
We also emphasize that the unique Higgs phenomenology of these scenarios
warrants a dedicated search program at the LHC.
|
[
{
"created": "Wed, 24 Aug 2016 20:00:46 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Dec 2016 19:15:42 GMT",
"version": "v2"
}
] |
2016-12-20
|
[
[
"Profumo",
"Stefano",
""
],
[
"Stefaniak",
"Tim",
""
]
] |
We study light, thermal neutralino dark matter in the sub-GeV to 65 GeV mass range in the Minimal Supersymmetric extension of the Standard Model (MSSM). We consider realizations of the limit of alignment without decoupling in the Higgs sector where the heavier CP-even Higgs impersonates the observed Higgs state at 125 GeV, while the lighter CP-even Higgs is the mediator of dark matter annihilation. We single out three distinct and novel possibilities for light dark matter: (i) a neutralino with mass around half the light Higgs mass, in the sub-GeV to 30 GeV mass range; (ii) a neutralino with a mass around half the pseudoscalar Higgs boson mass, in our examples around 60 to 65 GeV; (iii) a very light neutralino with mass around the light Higgs mass, pair-annihilating to Higgs pairs. We discuss the implications of all these possibilities for indirect and direct dark matter detection experiments, and we demonstrate that all scenarios will be tested by next generation direct detection experiments. We also emphasize that the unique Higgs phenomenology of these scenarios warrants a dedicated search program at the LHC.
|
hep-ph/0608099
|
Ayres Freitas
|
M. Awramik, M. Czakon, A. Freitas
|
Electroweak two-loop corrections to the effective weak mixing angle
|
28 pages; added numerical formulae for form factors Delta-r and
Delta-kappa, and few minor corrections, version to appear in JHEP
|
JHEP0611:048,2006
|
10.1088/1126-6708/2006/11/048
|
DESY 06-108, ZH-TH 17/06
|
hep-ph
| null |
Recently exact results for the complete electroweak two-loop contributions to
the effective weak mixing angle were published. This paper illustrates the
techniques used for this computation, in particular the methods for evaluating
the loop diagrams and the proper definition of Z-pole observables at
next-to-next-to-leading order. Numerical results are presented in terms of
simple parametrization formulae and compared in detail with a previous result
of an expansion up to next-to-leading order in the top-quark mass. Finally, an
estimate of the remaining theoretical uncertainties from unknown higher-order
corrections is given.
|
[
{
"created": "Wed, 9 Aug 2006 15:06:56 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Nov 2006 08:41:05 GMT",
"version": "v2"
}
] |
2009-11-11
|
[
[
"Awramik",
"M.",
""
],
[
"Czakon",
"M.",
""
],
[
"Freitas",
"A.",
""
]
] |
Recently exact results for the complete electroweak two-loop contributions to the effective weak mixing angle were published. This paper illustrates the techniques used for this computation, in particular the methods for evaluating the loop diagrams and the proper definition of Z-pole observables at next-to-next-to-leading order. Numerical results are presented in terms of simple parametrization formulae and compared in detail with a previous result of an expansion up to next-to-leading order in the top-quark mass. Finally, an estimate of the remaining theoretical uncertainties from unknown higher-order corrections is given.
|
1912.08211
|
Christopher Lepenik
|
Christopher Lepenik, Vicent Mateu
|
NLO Massive Event-Shape Differential and Cumulative Distributions
|
37 pages + appendices, 21 figures; v2: journal version
| null |
10.1007/JHEP03(2020)024
|
IFT-UAM/CSIC-19-149, UWThPh-2019-34
|
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We provide a general method to effectively compute differential and
cumulative event-shape distributions to $\mathcal{O}(\alpha_s)$ precision for
massive quarks produced primarily at an $e^+e^-$ collider. In particular, we
show that at this order, due to the screening of collinear singularities by the
quark mass, for all event shapes linearly sensitive to soft dynamics, there
appear only two distributions at threshold: a Dirac delta function and a plus
distribution. Furthermore, we show that the coefficient of the latter is
universal for any infra-red and collinear safe event shape, and provide an
analytic expression for it. Likewise, we compute a general formula for the
coefficient of the Dirac delta function, which depends only on the event-shape
measurement function in the soft limit. Finally, we present an efficient
algorithm to compute the differential and cumulative distributions, which does
not rely on Monte Carlo methods, therefore achieving a priory arbitrary
precision even in the extreme dijet region. We implement this algorithm in a
numeric code and show that it agrees with analytic results on the distribution
for 2-jettiness, heavy jet mass and a massive generalization of C-parameter.
|
[
{
"created": "Tue, 17 Dec 2019 19:00:02 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Feb 2020 22:58:57 GMT",
"version": "v2"
}
] |
2020-03-17
|
[
[
"Lepenik",
"Christopher",
""
],
[
"Mateu",
"Vicent",
""
]
] |
We provide a general method to effectively compute differential and cumulative event-shape distributions to $\mathcal{O}(\alpha_s)$ precision for massive quarks produced primarily at an $e^+e^-$ collider. In particular, we show that at this order, due to the screening of collinear singularities by the quark mass, for all event shapes linearly sensitive to soft dynamics, there appear only two distributions at threshold: a Dirac delta function and a plus distribution. Furthermore, we show that the coefficient of the latter is universal for any infra-red and collinear safe event shape, and provide an analytic expression for it. Likewise, we compute a general formula for the coefficient of the Dirac delta function, which depends only on the event-shape measurement function in the soft limit. Finally, we present an efficient algorithm to compute the differential and cumulative distributions, which does not rely on Monte Carlo methods, therefore achieving a priory arbitrary precision even in the extreme dijet region. We implement this algorithm in a numeric code and show that it agrees with analytic results on the distribution for 2-jettiness, heavy jet mass and a massive generalization of C-parameter.
|
0911.4875
|
Rachid Benbrik
|
Abdesslam Arhrib, Rachid Benbrik, Chuan-Hung Chen
|
Forward-backward asymmetry of top quark in diquark models
|
12 pages, 5 figures. Discussion and figures improved. Version
accepted for publication in PRD
|
Phys.Rev.D82:034034,2010
|
10.1103/PhysRevD.82.034034
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Motivated by the recent unexpected large forward-backward asymmetry (FBA) of
the top quark observed by D$\O$ and CDF at the Tevatron, we investigate a
possible explanation for the anomaly within the framework of diquark models.
Unlike other mechanisms induced by s-channel or t-channel, the top-quark pair
production in the diquark models is dictated by the u-channel diagram. We find
that the color-triplet diquark can generate the FBA of 20% when the constraint
from the cross section of the top-quark pair production is taken into account.
|
[
{
"created": "Wed, 25 Nov 2009 15:16:54 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Dec 2009 03:17:34 GMT",
"version": "v2"
},
{
"created": "Mon, 30 Aug 2010 18:56:13 GMT",
"version": "v3"
}
] |
2014-11-20
|
[
[
"Arhrib",
"Abdesslam",
""
],
[
"Benbrik",
"Rachid",
""
],
[
"Chen",
"Chuan-Hung",
""
]
] |
Motivated by the recent unexpected large forward-backward asymmetry (FBA) of the top quark observed by D$\O$ and CDF at the Tevatron, we investigate a possible explanation for the anomaly within the framework of diquark models. Unlike other mechanisms induced by s-channel or t-channel, the top-quark pair production in the diquark models is dictated by the u-channel diagram. We find that the color-triplet diquark can generate the FBA of 20% when the constraint from the cross section of the top-quark pair production is taken into account.
|
hep-ph/0412046
|
Alessandro Mirizzi
|
G.L.Fogli, E.Lisi (Bari U. & INFN, Bari), A.Mirizzi (Bari U. & INFN,
Bari & Munich, Max Planck Inst.), D.Montanino (Lecce U. & INFN, Lecce)
|
Probing supernova shock waves and neutrino flavor transitions in
next-generation water-Cherenkov detectors
|
Revised version (27 pages, 13 eps figures), to appear in JCAP.
Includes revised numerical estimates and figures. In particular: calculations
of inverse beta decay event rates improved by using the differential cross
section by Vissani and Strumia (astro-ph/0302055); supernova relic neutrino
flux calculations updated by using recent GALEX Mission data
(astro-ph/0411424) on the star formation rate (SFR). References added.
Conclusions unchanged
|
JCAP 0504:002,2005
|
10.1088/1475-7516/2005/04/002
| null |
hep-ph astro-ph hep-ex
| null |
Several current projects aim at building a large water-Cherenkov detector,
with a fiducial volume about 20 times larger than in the current
Super-Kamiokande experiment. These projects include the Underground nucleon
decay and Neutrino Observatory (UNO) in the Henderson Mine (Colorado), the
Hyper-Kamiokande (HK) detector in the Tochibora Mine (Japan), and the MEgaton
class PHYSics (MEMPHYS) detector in the Frejus site (Europe). We study the
physics potential of a reference next-generation detector (0.4 Mton of fiducial
mass) in providing information on supernova neutrino flavor transitions with
unprecedented statistics. After discussing the ingredients of our calculations,
we compute neutrino event rates from inverse beta decay ($\bar\nu_e p\to e^+ n
$), elastic scattering on electrons, and scattering on oxygen, with emphasis on
their time spectra, which may encode combined information on neutrino
oscillation parameters and on supernova forward (and possibly reverse) shock
waves. In particular, we show that an appropriate ratio of low-to-high energy
events can faithfully monitor the time evolution of the neutrino crossing
probability along the shock-wave profile. We also discuss some background
issues related to the detection of supernova relic neutrinos, with and without
the addition of gadolinium.
|
[
{
"created": "Fri, 3 Dec 2004 13:06:14 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Mar 2005 13:31:58 GMT",
"version": "v2"
}
] |
2009-10-07
|
[
[
"Fogli",
"G. L.",
"",
"Bari U. & INFN, Bari"
],
[
"Lisi",
"E.",
"",
"Bari U. & INFN, Bari"
],
[
"Mirizzi",
"A.",
"",
"Bari U. & INFN,\n Bari & Munich, Max Planck Inst."
],
[
"Montanino",
"D.",
"",
"Lecce U. & INFN, Lecce"
]
] |
Several current projects aim at building a large water-Cherenkov detector, with a fiducial volume about 20 times larger than in the current Super-Kamiokande experiment. These projects include the Underground nucleon decay and Neutrino Observatory (UNO) in the Henderson Mine (Colorado), the Hyper-Kamiokande (HK) detector in the Tochibora Mine (Japan), and the MEgaton class PHYSics (MEMPHYS) detector in the Frejus site (Europe). We study the physics potential of a reference next-generation detector (0.4 Mton of fiducial mass) in providing information on supernova neutrino flavor transitions with unprecedented statistics. After discussing the ingredients of our calculations, we compute neutrino event rates from inverse beta decay ($\bar\nu_e p\to e^+ n $), elastic scattering on electrons, and scattering on oxygen, with emphasis on their time spectra, which may encode combined information on neutrino oscillation parameters and on supernova forward (and possibly reverse) shock waves. In particular, we show that an appropriate ratio of low-to-high energy events can faithfully monitor the time evolution of the neutrino crossing probability along the shock-wave profile. We also discuss some background issues related to the detection of supernova relic neutrinos, with and without the addition of gadolinium.
|
hep-ph/9212305
|
Mariano Quiros
|
J.R. Espinosa and M. Quir\'os
|
Upper Bounds on the Lightest Higgs Boson Mass in General Supersymmetric
Standard Models
|
13 pages, latex, IEM-FT-64/92 (5 postscript figures availables upon
request)
|
Phys.Lett. B302 (1993) 51-58
|
10.1016/0370-2693(93)90634-T
| null |
hep-ph
| null |
In a general supersymmetric standard model there is an upper bound $m_h$ on
the tree level mass of the $CP=+1$ lightest Higgs boson which depends on the
electroweak scale, $\tan \beta$ and the gauge and Yukawa couplings of the
theory. When radiative corrections are included, the allowed region in the
$(m_h,m_t)$ plane depends on the scale $\Lambda$, below which the theory
remains perturbative, and the supersymmetry breaking scale $\Lambda_s$, that we
fix to $1\ TeV$. In the minimal model with $\Lambda=10^{16}\ GeV$: $m_h<130\
GeV$ and $m_t<185\ GeV$. In non-minimal models with an arbitrary number of
gauge singlets and $\Lambda=10^{16}\ GeV$: $m_h<145\ GeV$ and $m_t<185\ GeV$.
We also consider supersymmetric standard models with arbitrary Higgs sectors.
For models whose couplings saturate the scale $\Lambda=10^{16}\ GeV$ we find
$m_h<155\ GeV$ and $m_t<190\ GeV$. As one pushes the saturation scale $\Lambda$
down to $\Lambda_s$, the bounds on $m_h$ and $m_t$ increase. For instance, in
models with $\Lambda=10\ TeV$, the upper bounds for $m_h$ and $m_t$ go to $415\
GeV$ and $385\ GeV$, respectively.
|
[
{
"created": "Tue, 22 Dec 1992 20:02:36 GMT",
"version": "v1"
}
] |
2009-10-22
|
[
[
"Espinosa",
"J. R.",
""
],
[
"Quirós",
"M.",
""
]
] |
In a general supersymmetric standard model there is an upper bound $m_h$ on the tree level mass of the $CP=+1$ lightest Higgs boson which depends on the electroweak scale, $\tan \beta$ and the gauge and Yukawa couplings of the theory. When radiative corrections are included, the allowed region in the $(m_h,m_t)$ plane depends on the scale $\Lambda$, below which the theory remains perturbative, and the supersymmetry breaking scale $\Lambda_s$, that we fix to $1\ TeV$. In the minimal model with $\Lambda=10^{16}\ GeV$: $m_h<130\ GeV$ and $m_t<185\ GeV$. In non-minimal models with an arbitrary number of gauge singlets and $\Lambda=10^{16}\ GeV$: $m_h<145\ GeV$ and $m_t<185\ GeV$. We also consider supersymmetric standard models with arbitrary Higgs sectors. For models whose couplings saturate the scale $\Lambda=10^{16}\ GeV$ we find $m_h<155\ GeV$ and $m_t<190\ GeV$. As one pushes the saturation scale $\Lambda$ down to $\Lambda_s$, the bounds on $m_h$ and $m_t$ increase. For instance, in models with $\Lambda=10\ TeV$, the upper bounds for $m_h$ and $m_t$ go to $415\ GeV$ and $385\ GeV$, respectively.
|
0810.5266
|
Kai Wang
|
Zongguo Si and Kai Wang
|
GeV Majorana Neutrinos in Top-quark Decay at the LHC
|
15 pages, 8 figures
|
Phys.Rev.D79:014034,2009
|
10.1103/PhysRevD.79.014034
|
MADPH 08-1524,IPMU 08-0068,CAS-KITPC/ITP-072
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We explore the \Delta L=2 same-sign dilepton signal from top-quark decay via
a Majorana neutrino at the LHC in the top anti-top pair production samples. The
signature is same-sign dilepton plus multi-jets with no significant missing
energy. The most optimistic region lies where the Majorana neutrino mass is
between 15-65 GeV. For 300 fb^-1 integrated luminosity, it is possible to probe
S_{ij}, the effective mixing parameter, to order of 10^-5.
|
[
{
"created": "Wed, 29 Oct 2008 12:59:50 GMT",
"version": "v1"
}
] |
2010-04-21
|
[
[
"Si",
"Zongguo",
""
],
[
"Wang",
"Kai",
""
]
] |
We explore the \Delta L=2 same-sign dilepton signal from top-quark decay via a Majorana neutrino at the LHC in the top anti-top pair production samples. The signature is same-sign dilepton plus multi-jets with no significant missing energy. The most optimistic region lies where the Majorana neutrino mass is between 15-65 GeV. For 300 fb^-1 integrated luminosity, it is possible to probe S_{ij}, the effective mixing parameter, to order of 10^-5.
|
hep-ph/0610186
|
Takayuki Matsuki
|
Takayuki Matsuki, Toshiyuki Morii, and Kazutaka Sudoh
|
Radial Excitations of Heavy Mesons
|
3 pages, 1 figure, QNP06 conference report
|
Eur.Phys.J.A31:701-704,2007
|
10.1140/epja/i2006-10287-1
| null |
hep-ph hep-ex
| null |
Recent discovery of D_s states suggests existence of radial excitations. Our
semirelativistic quark potential model succeeds in reproducing these staes
within one to two percent of accuracy compared with the experiments, D_s0(2860)
and D_s^*(2715), which are identified as 0^+ and 1^- radial excitations (n=2).
We also present calculations of radial excitations for B/B_s heavy mesons.
Relation between our formulation and the modified Goldberger-Treiman relation
is also described.
|
[
{
"created": "Mon, 16 Oct 2006 05:52:53 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Oct 2006 00:52:24 GMT",
"version": "v2"
},
{
"created": "Thu, 8 Feb 2007 00:56:15 GMT",
"version": "v3"
}
] |
2008-11-26
|
[
[
"Matsuki",
"Takayuki",
""
],
[
"Morii",
"Toshiyuki",
""
],
[
"Sudoh",
"Kazutaka",
""
]
] |
Recent discovery of D_s states suggests existence of radial excitations. Our semirelativistic quark potential model succeeds in reproducing these staes within one to two percent of accuracy compared with the experiments, D_s0(2860) and D_s^*(2715), which are identified as 0^+ and 1^- radial excitations (n=2). We also present calculations of radial excitations for B/B_s heavy mesons. Relation between our formulation and the modified Goldberger-Treiman relation is also described.
|
hep-ph/0703154
|
S. Descotes-Genon
|
S. Descotes-Genon (LPT Orsay)
|
Low-energy pi-pi and pi-K scatterings revisited in three-flavour
resummed chiral perturbation theory
|
35 pages, 3 figures, accepted for publication in Eur. Phys. J. C
|
Eur.Phys.J.C52:141-158,2007
|
10.1140/epjc/s10052-007-0359-7
|
LPT-ORSAY/07-12
|
hep-ph
| null |
Chiral symmetry breaking may exhibit significantly different patterns in two
chiral limits: N_f=2 massless flavours (m_u=m_d=0, m_s physical) and N_f=3
massless flavours (m_u=m_d=0=m_s=0). Such a difference may arise due to vacuum
fluctuations of s-bar{s} pairs related to the violation of the Zweig rule in
the scalar sector, and could yield a numerical competition between
contributions counted as leading order and next-to-leading in the chiral
expansions of observables. We recall and extend Resummed Chiral Perturbation
Theory (ReChPT), a framework that we introduced previously to deal with such
instabilities: it requires a more careful definition of the relevant
observables and their one-loop chiral expansions. We analyse the amplitudes for
low-energy pi-pi and pi-K scatterings within ReChPT, which we match in
subthreshold regions with dispersive representations obtained from the
solutions Roy and Roy-Steiner equations. Using a frequentist approach, we
constrain the quark mass ratio as well as the quark condensate and the
pseudoscalar decay constant in the N_f=3 chiral limit. The results mildly
favour significant contributions of vacuum fluctuations suppressing the N_f=3
quark condensate compared to its N_f=2 counterpart.
|
[
{
"created": "Wed, 14 Mar 2007 16:59:33 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Jun 2007 08:16:57 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Descotes-Genon",
"S.",
"",
"LPT Orsay"
]
] |
Chiral symmetry breaking may exhibit significantly different patterns in two chiral limits: N_f=2 massless flavours (m_u=m_d=0, m_s physical) and N_f=3 massless flavours (m_u=m_d=0=m_s=0). Such a difference may arise due to vacuum fluctuations of s-bar{s} pairs related to the violation of the Zweig rule in the scalar sector, and could yield a numerical competition between contributions counted as leading order and next-to-leading in the chiral expansions of observables. We recall and extend Resummed Chiral Perturbation Theory (ReChPT), a framework that we introduced previously to deal with such instabilities: it requires a more careful definition of the relevant observables and their one-loop chiral expansions. We analyse the amplitudes for low-energy pi-pi and pi-K scatterings within ReChPT, which we match in subthreshold regions with dispersive representations obtained from the solutions Roy and Roy-Steiner equations. Using a frequentist approach, we constrain the quark mass ratio as well as the quark condensate and the pseudoscalar decay constant in the N_f=3 chiral limit. The results mildly favour significant contributions of vacuum fluctuations suppressing the N_f=3 quark condensate compared to its N_f=2 counterpart.
|
1604.01305
|
Marcin Bury
|
Marcin Bury, Michal Deak, Krzysztof Kutak and Sebastian Sapeta
|
Single and double inclusive forward jet production at the LHC at
$\sqrt{s}$ = 7 and 13 TeV
|
14 pages, 5 figures, version accepted for PLB
|
Physics Letters B, Volume 760, 10 September 2016, Pages 594-601
|
10.1016/j.physletb.2016.07.041
|
IFJPAN-IV-2016-6; CERN-TH-2016-077
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We provide a description of the transverse momentum spectrum of single
inclusive forward jets produced at the LHC, at the center-of-mass energies of 7
and 13 TeV, using the high energy factorization (HEF) framework. We
subsequently study double inclusive forward jet production and, in particular,
we calculate contributions to azimuthal angle distributions coming from double
parton scattering. We also compare our results for double inclusive jet
production to those obtained with the Pythia Monte Carlo generator. This
comparison confirms that the HEF resummation acts like an initial state parton
shower. It also points towards the need to include final state radiation
effects in the HEF formalism.
|
[
{
"created": "Tue, 5 Apr 2016 15:45:50 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Apr 2016 17:38:14 GMT",
"version": "v2"
},
{
"created": "Thu, 11 Aug 2016 13:34:47 GMT",
"version": "v3"
}
] |
2016-08-12
|
[
[
"Bury",
"Marcin",
""
],
[
"Deak",
"Michal",
""
],
[
"Kutak",
"Krzysztof",
""
],
[
"Sapeta",
"Sebastian",
""
]
] |
We provide a description of the transverse momentum spectrum of single inclusive forward jets produced at the LHC, at the center-of-mass energies of 7 and 13 TeV, using the high energy factorization (HEF) framework. We subsequently study double inclusive forward jet production and, in particular, we calculate contributions to azimuthal angle distributions coming from double parton scattering. We also compare our results for double inclusive jet production to those obtained with the Pythia Monte Carlo generator. This comparison confirms that the HEF resummation acts like an initial state parton shower. It also points towards the need to include final state radiation effects in the HEF formalism.
|
2204.11893
|
Risto Paatelainen
|
Tyler Gorda, Aleksi Kurkela, Juuso \"Osterman, Risto Paatelainen, Saga
S\"appi, Philipp Schicho, Kaapo Sepp\"anen, Aleksi Vuorinen
|
Degenerate fermionic matter at N$^3$LO: Quantum Electrodynamics
|
6 pages (main text), 6 pages (supplemental material) and 3 figures
| null |
10.1103/PhysRevD.107.L031501
|
HIP-2022-9/TH
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We determine the pressure of a cold and dense electron gas to a nearly
complete next-to-next-to-next-to-leading order (N$^3$LO) in the fine-structure
constant $\alpha_e$, utilizing a new result for the two-loop photon self-energy
from a companion paper. Our result contains all infrared-sensitive
contributions to the pressure at this order, including the coefficient of the
$O(\alpha_e^3 \ln \alpha_e^{ })$ term, and leaves only a single coefficient
associated with the contributions of unresummed hard momenta undetermined.
Moreover, we explicitly demonstrate the complete cancellation of infrared
divergences according to the effective field theory paradigm by determining
part of the hard contributions at this order. Our calculation provides the
first improvement to a 45-year-old milestone result and demonstrates the
feasibility of the corresponding N$^3$LO calculation for cold and dense quark
matter.
|
[
{
"created": "Mon, 25 Apr 2022 18:01:10 GMT",
"version": "v1"
}
] |
2023-03-01
|
[
[
"Gorda",
"Tyler",
""
],
[
"Kurkela",
"Aleksi",
""
],
[
"Österman",
"Juuso",
""
],
[
"Paatelainen",
"Risto",
""
],
[
"Säppi",
"Saga",
""
],
[
"Schicho",
"Philipp",
""
],
[
"Seppänen",
"Kaapo",
""
],
[
"Vuorinen",
"Aleksi",
""
]
] |
We determine the pressure of a cold and dense electron gas to a nearly complete next-to-next-to-next-to-leading order (N$^3$LO) in the fine-structure constant $\alpha_e$, utilizing a new result for the two-loop photon self-energy from a companion paper. Our result contains all infrared-sensitive contributions to the pressure at this order, including the coefficient of the $O(\alpha_e^3 \ln \alpha_e^{ })$ term, and leaves only a single coefficient associated with the contributions of unresummed hard momenta undetermined. Moreover, we explicitly demonstrate the complete cancellation of infrared divergences according to the effective field theory paradigm by determining part of the hard contributions at this order. Our calculation provides the first improvement to a 45-year-old milestone result and demonstrates the feasibility of the corresponding N$^3$LO calculation for cold and dense quark matter.
|
hep-ph/9707318
|
Matthias Neubert
|
A.G. Grozin (Novosibirsk), M. Neubert (CERN)
|
Higher-order estimates of the chromomagnetic moment of a heavy quark
|
16 pages, 3 figures embedded
|
Nucl.Phys. B508 (1997) 311-326
|
10.1016/S0550-3213(97)00615-9
|
CERN-TH/97-102, Budker INP 97-60
|
hep-ph
| null |
The leading beta_0^(n-1) alpha_s^n terms in the Wilson coefficient and
anomalous dimension of the chromomagnetic operator in the heavy-quark effective
Lagrangian are summed to all orders of perturbation theory. The perturbation
series for the anomalous dimension is well behaved, while that for the Wilson
coefficient exhibits a divergent behaviour already in low orders, caused by a
nearby infrared renormalon singularity. The resulting ambiguity is commensurate
with terms of order 1/m^2 in the effective Lagrangian, whose corresponding
ultraviolet renormalons are identified. An excellent approximation for the
scheme-invariant Wilson coefficient at next-to-next-to-leading order in
renormalization-group improved perturbation theory is obtained.
|
[
{
"created": "Fri, 11 Jul 1997 09:01:39 GMT",
"version": "v1"
}
] |
2009-10-30
|
[
[
"Grozin",
"A. G.",
"",
"Novosibirsk"
],
[
"Neubert",
"M.",
"",
"CERN"
]
] |
The leading beta_0^(n-1) alpha_s^n terms in the Wilson coefficient and anomalous dimension of the chromomagnetic operator in the heavy-quark effective Lagrangian are summed to all orders of perturbation theory. The perturbation series for the anomalous dimension is well behaved, while that for the Wilson coefficient exhibits a divergent behaviour already in low orders, caused by a nearby infrared renormalon singularity. The resulting ambiguity is commensurate with terms of order 1/m^2 in the effective Lagrangian, whose corresponding ultraviolet renormalons are identified. An excellent approximation for the scheme-invariant Wilson coefficient at next-to-next-to-leading order in renormalization-group improved perturbation theory is obtained.
|
1602.07099
|
Pouya Bakhti
|
Pouya Bakhti and Yasaman Farzan
|
CP-Violation and Non-Standard Interactions at the MOMENT
|
15 pages, 6 figures
| null |
10.1007/JHEP07(2016)109
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
To measure the last unknown $3\nu$ oscillation parameter ($\delta$), several
long baseline neutrino experiments have been designed or proposed. Recently it
has been shown that turning on neutral current Non-Standard Interactions (NSI)
of neutrinos with matter can induce degeneracies that may even hinder the
proposed state-of-the-art DUNE long baseline experiment from measuring the
value of $\delta$. We study how the result of the proposed MOMENT experiment
with a baseline of 150 km and $200~{\rm MeV}<E_\nu<600~{\rm MeV}$ can help to
solve the degeneracy induced by NSI and determine the true value of $\delta$.
|
[
{
"created": "Tue, 23 Feb 2016 09:34:25 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Dec 2016 14:35:05 GMT",
"version": "v2"
}
] |
2016-12-08
|
[
[
"Bakhti",
"Pouya",
""
],
[
"Farzan",
"Yasaman",
""
]
] |
To measure the last unknown $3\nu$ oscillation parameter ($\delta$), several long baseline neutrino experiments have been designed or proposed. Recently it has been shown that turning on neutral current Non-Standard Interactions (NSI) of neutrinos with matter can induce degeneracies that may even hinder the proposed state-of-the-art DUNE long baseline experiment from measuring the value of $\delta$. We study how the result of the proposed MOMENT experiment with a baseline of 150 km and $200~{\rm MeV}<E_\nu<600~{\rm MeV}$ can help to solve the degeneracy induced by NSI and determine the true value of $\delta$.
|
hep-ph/0506239
|
Mustafa Savci
|
T. M. Aliev, V. Bashiry and M. Savci
|
Double-lepton polarization asymmetries in the Exclusive (B -> rho l^+
l^-) decay beyond the Standard Model
|
28 pages, 16 figures, LaTeX formatted
|
Phys.Rev. D72 (2005) 034031
|
10.1103/PhysRevD.72.034031
|
metu-phys-hep-06-15
|
hep-ph
| null |
The double-lepton polarization asymmetries in (B -> rho l^+ l^-) decay is
analyzed in a model independent framework. The general expressions for nine
double-polarization asymmetries are calculated. It is shown that the study of
the double-lepton polarization asymmetries proves to be very useful tool in
looking for new physics beyond the standard model.
|
[
{
"created": "Thu, 23 Jun 2005 19:30:28 GMT",
"version": "v1"
}
] |
2009-11-11
|
[
[
"Aliev",
"T. M.",
""
],
[
"Bashiry",
"V.",
""
],
[
"Savci",
"M.",
""
]
] |
The double-lepton polarization asymmetries in (B -> rho l^+ l^-) decay is analyzed in a model independent framework. The general expressions for nine double-polarization asymmetries are calculated. It is shown that the study of the double-lepton polarization asymmetries proves to be very useful tool in looking for new physics beyond the standard model.
|
hep-ph/0405041
|
Mikhail Ryskin G.
|
S.B. Nurushev and M.G. Ryskin
|
Experimental data on the single spin asymmetry and their interpretations
by the chromo-magnetic string model
|
17 pages, 3 figures
|
Phys.Atom.Nucl. 69 (2006) 133-141
|
10.1134/S1063778806010170
| null |
hep-ph
| null |
An attempt is made to interpret the various existing experimental data on the
single spin asymmetries in inclusive pion production by the polarized proton
and antiproton beams. As the basis of analysis the chromo-magnetic string model
is used. A whole measured kinematic region is covered. The successes and fails
of such approach are outlined. The possible improvements of model are
discussed.
|
[
{
"created": "Wed, 5 May 2004 15:33:08 GMT",
"version": "v1"
}
] |
2015-06-25
|
[
[
"Nurushev",
"S. B.",
""
],
[
"Ryskin",
"M. G.",
""
]
] |
An attempt is made to interpret the various existing experimental data on the single spin asymmetries in inclusive pion production by the polarized proton and antiproton beams. As the basis of analysis the chromo-magnetic string model is used. A whole measured kinematic region is covered. The successes and fails of such approach are outlined. The possible improvements of model are discussed.
|
2002.08315
|
Sarira Sahu
|
Jos\'e F. Nieves and Sarira Sahu
|
Neutrino decoherence in an electron and nucleon background
|
27 Pages, 2 Figures, Typographical errors in Eqs. (6.5) and (6.11) of
the PRD published version have been corrected. arXiv admin note: text overlap
with arXiv:1909.11271
|
Phys. Rev. D 102, 056007 (2020)
|
10.1103/PhysRevD.102.056007
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We consider the decoherence effects in the propagation of active neutrinos
due to the non-forward neutrino scattering processes in a matter background
composed of electrons and nucleons. We calculate the contribution to the
imaginary part of the neutrino self-energy arising from such processes. Since
the initial neutrino state is depleted but does not actually disappear (the
initial neutrino transitions into a neutrino of a different flavor but does not
decay) those processes should be associated with decoherence effects that
cannot be described in terms of the coherent evolution of the state vector.
Based on the formalism developed in our previous work for treating the
non-forward scattering processes using the notion of the stochastic evolution
of the state, we identify the jump operators, as used in the context of the
master or Lindblad equation, in terms of the results of the the calculation of
the non-forward neutrino scattering contribution to the imaginary part of the
neutrino self-energy. As a guide to estimating the decoherence effects in
situations of practical interest we give explicit formulas for the decoherence
terms for different background conditions, and point out some of the salient
features in particular the neutrino energy dependence. To establish contact wih
previous works in which the decoherence terms are treated as phenomenological
parameters, we consider the solution to the evolution equation in the
two-generation case. We give formulas that are useful for estimating the
effects of the decoherence terms under various conditions and environments,
including the typical conditions applicable to long baseline experiments, where
matter effects are important. In those contexts the effects appear to be small,
and indicative that if significant decoherence effects were to be found they
would be due to non-standard contributions to the decoherence terms.
|
[
{
"created": "Mon, 17 Feb 2020 20:02:27 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Sep 2020 05:01:07 GMT",
"version": "v2"
},
{
"created": "Mon, 15 Mar 2021 01:31:38 GMT",
"version": "v3"
},
{
"created": "Sat, 10 Apr 2021 01:27:50 GMT",
"version": "v4"
},
{
"created": "Tue, 6 Jul 2021 11:36:17 GMT",
"version": "v5"
}
] |
2021-07-07
|
[
[
"Nieves",
"José F.",
""
],
[
"Sahu",
"Sarira",
""
]
] |
We consider the decoherence effects in the propagation of active neutrinos due to the non-forward neutrino scattering processes in a matter background composed of electrons and nucleons. We calculate the contribution to the imaginary part of the neutrino self-energy arising from such processes. Since the initial neutrino state is depleted but does not actually disappear (the initial neutrino transitions into a neutrino of a different flavor but does not decay) those processes should be associated with decoherence effects that cannot be described in terms of the coherent evolution of the state vector. Based on the formalism developed in our previous work for treating the non-forward scattering processes using the notion of the stochastic evolution of the state, we identify the jump operators, as used in the context of the master or Lindblad equation, in terms of the results of the the calculation of the non-forward neutrino scattering contribution to the imaginary part of the neutrino self-energy. As a guide to estimating the decoherence effects in situations of practical interest we give explicit formulas for the decoherence terms for different background conditions, and point out some of the salient features in particular the neutrino energy dependence. To establish contact wih previous works in which the decoherence terms are treated as phenomenological parameters, we consider the solution to the evolution equation in the two-generation case. We give formulas that are useful for estimating the effects of the decoherence terms under various conditions and environments, including the typical conditions applicable to long baseline experiments, where matter effects are important. In those contexts the effects appear to be small, and indicative that if significant decoherence effects were to be found they would be due to non-standard contributions to the decoherence terms.
|
1403.2555
|
Gorazd Cvetic
|
Gorazd Cvetic, C. S. Kim, Jilberto Zamora-Saa
|
CP violation in lepton number violating semihadronic decays of $K, D,
D_s, B, B_c$
|
19 pages, 8 figures; v2: a new Table (I); minor changes in the text;
new references [5,31,32]; ref.[19] extended; to appear in Phys.Rev.D
|
Phys. Rev. D 89, 093012 (2014)
|
10.1103/PhysRevD.89.093012
|
USM-TH-321
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the CP violation in lepton number violating meson decays $M^{\pm}
\to \ell_1^{\pm} \ell_2^{\pm} M^{' \mp}$, where $M$ and $M^{'}$ are
pseudoscalar mesons, $M=K, D, D_s, B, B_c$ and $M^{'}=\pi, K, D, D_s$, and the
charged leptons are $\ell_1, \ell_2 = e, \mu$. It turns out that the
CP-violating difference $S_{-}(M) \equiv [\Gamma(M^- \to \ell_1^- \ell_2^- M^{'
+})-\Gamma(M^+ \to \ell_1^+ \ell_2^+ M^{' -})]$ can become appreciable when two
intermediate on-shell Majorana neutrinos $N_j$ ($j=1,2$) participate in these
decays. Our calculations show that the asymmetry becomes largest when the
masses of $N_1$ and $N_2$ are almost degenerate, i.e., when the mass difference
$\Delta M_N$ becomes comparable with the (small) decay widths $\Gamma_N$ of
these neutrinos: $\Delta M_N \not\gg \Gamma_N$. We show that in such a case,
the CP ratio ${\cal A}_{CP}(M) \equiv [\Gamma(M^- \to \ell_1^- \ell_2^- M^{'
+})-\Gamma(M^+ \to \ell_1^+ \ell_2^+ M^{' -})]/[\Gamma(M^- \to \ell_1^-
\ell_2^- M^{' +})+\Gamma(M^+ \to \ell_1^+ \ell_2^+ M^{' -})]$ becomes a
quantity $\sim 1$. The observation of CP violation in these decays would be
consistent with the existence of the well-motivated $\nu$MSM model with two
almost degenerate heavy neutrinos in the mass range between $M_N \sim
0.1$-$10^1$ GeV.
|
[
{
"created": "Tue, 11 Mar 2014 12:39:50 GMT",
"version": "v1"
},
{
"created": "Mon, 12 May 2014 17:13:41 GMT",
"version": "v2"
}
] |
2014-05-21
|
[
[
"Cvetic",
"Gorazd",
""
],
[
"Kim",
"C. S.",
""
],
[
"Zamora-Saa",
"Jilberto",
""
]
] |
We study the CP violation in lepton number violating meson decays $M^{\pm} \to \ell_1^{\pm} \ell_2^{\pm} M^{' \mp}$, where $M$ and $M^{'}$ are pseudoscalar mesons, $M=K, D, D_s, B, B_c$ and $M^{'}=\pi, K, D, D_s$, and the charged leptons are $\ell_1, \ell_2 = e, \mu$. It turns out that the CP-violating difference $S_{-}(M) \equiv [\Gamma(M^- \to \ell_1^- \ell_2^- M^{' +})-\Gamma(M^+ \to \ell_1^+ \ell_2^+ M^{' -})]$ can become appreciable when two intermediate on-shell Majorana neutrinos $N_j$ ($j=1,2$) participate in these decays. Our calculations show that the asymmetry becomes largest when the masses of $N_1$ and $N_2$ are almost degenerate, i.e., when the mass difference $\Delta M_N$ becomes comparable with the (small) decay widths $\Gamma_N$ of these neutrinos: $\Delta M_N \not\gg \Gamma_N$. We show that in such a case, the CP ratio ${\cal A}_{CP}(M) \equiv [\Gamma(M^- \to \ell_1^- \ell_2^- M^{' +})-\Gamma(M^+ \to \ell_1^+ \ell_2^+ M^{' -})]/[\Gamma(M^- \to \ell_1^- \ell_2^- M^{' +})+\Gamma(M^+ \to \ell_1^+ \ell_2^+ M^{' -})]$ becomes a quantity $\sim 1$. The observation of CP violation in these decays would be consistent with the existence of the well-motivated $\nu$MSM model with two almost degenerate heavy neutrinos in the mass range between $M_N \sim 0.1$-$10^1$ GeV.
|
hep-ph/0010231
|
Alexander Friedland
|
Alexander Friedland (Princeton, Inst. for Advanced Study & Berkeley,
LBNL)
|
On the Evolution of the Neutrino State inside the Sun
|
34 pages, 8 figures
|
Phys.Rev.D64:013008,2001
|
10.1103/PhysRevD.64.013008
|
LBNL-46980, IASSNS-AST-00/55
|
hep-ph
| null |
We reexamine the conventional physical description of the neutrino evolution
inside the Sun. We point out that the traditional resonance condition has
physical meaning only in the limit of small values of the neutrino mixing
angle, theta<<1. For large values of theta, the resonance condition specifies
neither the point of the maximal violation of adiabaticity in the nonadiabatic
case, nor the point where the flavor conversion occurs at the maximal rate in
the adiabatic case. The corresponding correct conditions, valid for all values
of theta including theta>pi/4, are presented. An adiabaticity condition valid
for all values of theta is also described. The results of accurate numerical
computations of the level jumping probability in the Sun are presented. These
calculations cover a wide range of Delta m^2, from the vacuum oscillation
region to the region where the standard exponential approximation is good. A
convenient empirical parametrization of these results in terms of elementary
functions is given. The matter effects in the so-called "quasi-vacuum
oscillation regime" are discussed. Finally, it is shown how the known
analytical results for the exponential, 1/x, and linear matter distributions
can be simply obtained from the formula for the hyperbolic tangent profile. An
explicit formula for the jumping probability for the distribution N_e ~
(coth(x/l) +- 1) is obtained.
|
[
{
"created": "Thu, 19 Oct 2000 23:15:01 GMT",
"version": "v1"
},
{
"created": "Sat, 21 Oct 2000 04:10:04 GMT",
"version": "v2"
},
{
"created": "Fri, 26 Jan 2001 16:44:23 GMT",
"version": "v3"
}
] |
2014-11-17
|
[
[
"Friedland",
"Alexander",
"",
"Princeton, Inst. for Advanced Study & Berkeley,\n LBNL"
]
] |
We reexamine the conventional physical description of the neutrino evolution inside the Sun. We point out that the traditional resonance condition has physical meaning only in the limit of small values of the neutrino mixing angle, theta<<1. For large values of theta, the resonance condition specifies neither the point of the maximal violation of adiabaticity in the nonadiabatic case, nor the point where the flavor conversion occurs at the maximal rate in the adiabatic case. The corresponding correct conditions, valid for all values of theta including theta>pi/4, are presented. An adiabaticity condition valid for all values of theta is also described. The results of accurate numerical computations of the level jumping probability in the Sun are presented. These calculations cover a wide range of Delta m^2, from the vacuum oscillation region to the region where the standard exponential approximation is good. A convenient empirical parametrization of these results in terms of elementary functions is given. The matter effects in the so-called "quasi-vacuum oscillation regime" are discussed. Finally, it is shown how the known analytical results for the exponential, 1/x, and linear matter distributions can be simply obtained from the formula for the hyperbolic tangent profile. An explicit formula for the jumping probability for the distribution N_e ~ (coth(x/l) +- 1) is obtained.
|
1110.2375
|
Massimiliano Grazzini
|
Stefano Catani, Leandro Cieri, Daniel de Florian, Giancarlo Ferrera
and Massimiliano Grazzini
|
Diphoton production at hadron colliders: a fully-differential QCD
calculation at NNLO
|
Numerical error at NNLO corrected and corresponding results updated.
Reference added to numerical code 2gNNLO
| null |
10.1103/PhysRevLett.108.072001
|
ZU-TH 18/11, IFUM-984-FT
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider direct diphoton production in hadron collisions, and we compute
the next-to-next-to-leading order (NNLO) QCD radiative corrections at the
fully-differential level. Our calculation uses the $q_T$ subtraction formalism
and it is implemented in a parton level Monte Carlo program. The program allows
the user to apply arbitrary kinematical cuts on the final-state photons and the
associated jet activity, and to compute the corresponding distributions in the
form of bin histograms. We present selected numerical results related to Higgs
boson searches at the LHC and corresponding results at the Tevatron.
|
[
{
"created": "Tue, 11 Oct 2011 13:48:49 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Jun 2016 07:38:53 GMT",
"version": "v2"
}
] |
2016-06-27
|
[
[
"Catani",
"Stefano",
""
],
[
"Cieri",
"Leandro",
""
],
[
"de Florian",
"Daniel",
""
],
[
"Ferrera",
"Giancarlo",
""
],
[
"Grazzini",
"Massimiliano",
""
]
] |
We consider direct diphoton production in hadron collisions, and we compute the next-to-next-to-leading order (NNLO) QCD radiative corrections at the fully-differential level. Our calculation uses the $q_T$ subtraction formalism and it is implemented in a parton level Monte Carlo program. The program allows the user to apply arbitrary kinematical cuts on the final-state photons and the associated jet activity, and to compute the corresponding distributions in the form of bin histograms. We present selected numerical results related to Higgs boson searches at the LHC and corresponding results at the Tevatron.
|
1401.3284
|
Ernest Ma
|
Ernest Ma (UC Riverside)
|
Vanishing Higgs Quadratic Divergence in the Scotogenic Model and Beyond
|
6 pages, 2 figures
| null |
10.1016/j.physletb.2014.03.047
|
UCRHEP-T539 (January 2014)
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
It is shown that the inherent quadratic divergence of the Higgs mass
renormalization of the standard model may be avoided in the well-studied
scotogenic model of radiative neutrino mass as well as other analogous
extensions.
|
[
{
"created": "Tue, 14 Jan 2014 18:55:15 GMT",
"version": "v1"
}
] |
2015-06-18
|
[
[
"Ma",
"Ernest",
"",
"UC Riverside"
]
] |
It is shown that the inherent quadratic divergence of the Higgs mass renormalization of the standard model may be avoided in the well-studied scotogenic model of radiative neutrino mass as well as other analogous extensions.
|
2301.00231
|
Miguel Levy
|
Dipankar Das, Miguel Levy, Palash B. Pal, Anugrah M. Prasad, Ipsita
Saha, Ayushi Srivastava
|
Democratic three Higgs-doublet models: the custodial limit and
wrong-sign Yukawa
|
22 pages, 3 captioned figures. Version accepted for publication in
Phys. Rev. D
| null |
10.1103/PhysRevD.107.055035
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study two novel aspects of democratic 3HDMs -- the custodial limit and the
possibility of wrong-sign Yukawa couplings. In the custodial limit, the
democratic 3HDMs can easily negotiate the constraints from the electroweak
$T$-parameter. We also uncover the possibility of having wrong-sign Yukawa
couplings in democratic 3HDMs, as in the case of 2HDMs. We show that a
democratic 3HDM encompasses all the wrong-sign possibilities entertained by
2HDMs, and has considerably more leeway in the wrong-sign limit as compared to
the 2HDM case. Our study underscores the importance of reporting analysis in
the kappa-formalism without any implicit assumptions on the signs of the
kappas.
|
[
{
"created": "Sat, 31 Dec 2022 15:51:34 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Mar 2023 14:03:13 GMT",
"version": "v2"
}
] |
2023-04-05
|
[
[
"Das",
"Dipankar",
""
],
[
"Levy",
"Miguel",
""
],
[
"Pal",
"Palash B.",
""
],
[
"Prasad",
"Anugrah M.",
""
],
[
"Saha",
"Ipsita",
""
],
[
"Srivastava",
"Ayushi",
""
]
] |
We study two novel aspects of democratic 3HDMs -- the custodial limit and the possibility of wrong-sign Yukawa couplings. In the custodial limit, the democratic 3HDMs can easily negotiate the constraints from the electroweak $T$-parameter. We also uncover the possibility of having wrong-sign Yukawa couplings in democratic 3HDMs, as in the case of 2HDMs. We show that a democratic 3HDM encompasses all the wrong-sign possibilities entertained by 2HDMs, and has considerably more leeway in the wrong-sign limit as compared to the 2HDM case. Our study underscores the importance of reporting analysis in the kappa-formalism without any implicit assumptions on the signs of the kappas.
|
hep-ph/0012195
|
Michael Melles
|
Michael Melles
|
The Standard Model Higgs in $\gamma \gamma$ Collisions
|
contribution to LCWS2000 at Fermilab
| null |
10.1063/1.1394330
| null |
hep-ph
| null |
For a Higgs boson below the $W^\pm$ threshold, the $\gamma \gamma$ collider
option of a future linear $e^+ e^-$ machine is compelling. In this case one can
measure the ``gold-plated'' loop induced $\Gamma (H \longrightarrow \gamma
\gamma)$ partial width to high precision, testing various extensions of the
Standard Model. With recent progress in the expected $\gamma \gamma$ luminosity
at TESLA, we find that for a Higgs of 115 GeV a statistical accuracy of the two
photon partial width of 1.4 % is possible. The total width depends thus solely
on the accuracy of $BR(H \longrightarrow \gamma \gamma)$ and is of ${\cal O}
(10 %)$.
|
[
{
"created": "Fri, 15 Dec 2000 16:37:19 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Melles",
"Michael",
""
]
] |
For a Higgs boson below the $W^\pm$ threshold, the $\gamma \gamma$ collider option of a future linear $e^+ e^-$ machine is compelling. In this case one can measure the ``gold-plated'' loop induced $\Gamma (H \longrightarrow \gamma \gamma)$ partial width to high precision, testing various extensions of the Standard Model. With recent progress in the expected $\gamma \gamma$ luminosity at TESLA, we find that for a Higgs of 115 GeV a statistical accuracy of the two photon partial width of 1.4 % is possible. The total width depends thus solely on the accuracy of $BR(H \longrightarrow \gamma \gamma)$ and is of ${\cal O} (10 %)$.
|
2301.07439
|
Junichiro Kawamura
|
Yoshihiko Abe, Tetsutaro Higaki, Junichiro Kawamura and Tatsuo
Kobayashi
|
Quark masses and CKM hierarchies from $S_4^\prime$ modular flavor
symmetry
|
13 pages, 3 tables; ver2 comments on CP violation added
| null | null |
CTPU-PTC-23-01, EPHOU-23-002
|
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We propose models to explain the hierarchies of the quark masses and mixing
by utilizing the $S_4^\prime$ modular flavor symmetry. The hierarchy is
realized by the modulus $\tau$ stabilized at $\mathrm{Im}\,\tau \gg 1$, where
the residual $Z_4^T$ symmetry is approximately unbroken and the
Froggatt-Nielsen mechanism works. It is found that the quark hierarchies are
realized only in a few cases of quark representations. We study two models with
assigning the modular weights, so that the observed quark hierarchies are
explained in the cases of both small and large ratios of the top to bottom
Yukawa couplings. We also argue that $\mathcal{O}({0.1})$ hierarchies of the
$\mathcal{O}({1})$ coefficients can be explained by imposing another $S_3$
modular symmetry.
|
[
{
"created": "Wed, 18 Jan 2023 11:20:29 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Jan 2023 07:37:23 GMT",
"version": "v2"
}
] |
2023-01-27
|
[
[
"Abe",
"Yoshihiko",
""
],
[
"Higaki",
"Tetsutaro",
""
],
[
"Kawamura",
"Junichiro",
""
],
[
"Kobayashi",
"Tatsuo",
""
]
] |
We propose models to explain the hierarchies of the quark masses and mixing by utilizing the $S_4^\prime$ modular flavor symmetry. The hierarchy is realized by the modulus $\tau$ stabilized at $\mathrm{Im}\,\tau \gg 1$, where the residual $Z_4^T$ symmetry is approximately unbroken and the Froggatt-Nielsen mechanism works. It is found that the quark hierarchies are realized only in a few cases of quark representations. We study two models with assigning the modular weights, so that the observed quark hierarchies are explained in the cases of both small and large ratios of the top to bottom Yukawa couplings. We also argue that $\mathcal{O}({0.1})$ hierarchies of the $\mathcal{O}({1})$ coefficients can be explained by imposing another $S_3$ modular symmetry.
|
hep-ph/0107121
|
Ulrich Nierste
|
Gabriela Barenboim, Martin Gorbahn, Ulrich Nierste and Martti Raidal
|
Higgs Sector of the Minimal Left-Right Symmetric Model
|
brief discussion of non-minimal Higgs sectors added, journal version
|
Phys.Rev.D65:095003,2002
|
10.1103/PhysRevD.65.095003
|
FERMILAB-Pub-01/213-T, TUM-HEP-384-01, CERN-TH/2001-181
|
hep-ph
| null |
We perform an exhaustive analysis of the most general Higgs sector of the
minimal left-right symmetric model (MLRM). We find that the CP properties of
the vacuum state are connected to the Higgs spectrum: if CP is broken
spontaneously, the MLRM does not approach the Standard Model in the limit of a
decoupling left-right symmetry breaking scale. Depending on the size of the CP
phases scenarios with extra non-decoupling flavor-violating doublet Higgses or
very light SU(2) triplet Higgses emerge, both of which are ruled out by
phenomenology. For zero CP phases the non-standard Higgses decouple only if a
very unnatural fine-tuning condition is fulfilled. We also discuss
generalizations to a non-minimal Higgs sector.
|
[
{
"created": "Tue, 10 Jul 2001 21:35:49 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Jul 2001 01:37:04 GMT",
"version": "v2"
},
{
"created": "Fri, 1 Mar 2002 23:00:19 GMT",
"version": "v3"
}
] |
2014-11-17
|
[
[
"Barenboim",
"Gabriela",
""
],
[
"Gorbahn",
"Martin",
""
],
[
"Nierste",
"Ulrich",
""
],
[
"Raidal",
"Martti",
""
]
] |
We perform an exhaustive analysis of the most general Higgs sector of the minimal left-right symmetric model (MLRM). We find that the CP properties of the vacuum state are connected to the Higgs spectrum: if CP is broken spontaneously, the MLRM does not approach the Standard Model in the limit of a decoupling left-right symmetry breaking scale. Depending on the size of the CP phases scenarios with extra non-decoupling flavor-violating doublet Higgses or very light SU(2) triplet Higgses emerge, both of which are ruled out by phenomenology. For zero CP phases the non-standard Higgses decouple only if a very unnatural fine-tuning condition is fulfilled. We also discuss generalizations to a non-minimal Higgs sector.
|
hep-ph/0002079
|
Sreerup Raychaudhuri fc phy
|
Prasanta Das, Sreerup Raychaudhuri, Saswati Sarkar (IIT, Kanpur)
|
HERA Constraint on Warped Quantum Gravity
|
13 pages, LaTeX, 2 ps figures; reference added and minor errors
corrected
|
JHEP 0007 (2000) 050
|
10.1088/1126-6708/2000/07/050
|
IITK-HEP-00-01
|
hep-ph
| null |
We study recent data on deep inelastic e^+ p scattering at HERA to constrain
the parameters of a Randall-Sundrum-type scenario of quantum gravity with a
small extra dimension and a non-factorable geometry.
|
[
{
"created": "Mon, 7 Feb 2000 21:35:09 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Feb 2000 16:15:23 GMT",
"version": "v2"
}
] |
2009-10-31
|
[
[
"Das",
"Prasanta",
"",
"IIT, Kanpur"
],
[
"Raychaudhuri",
"Sreerup",
"",
"IIT, Kanpur"
],
[
"Sarkar",
"Saswati",
"",
"IIT, Kanpur"
]
] |
We study recent data on deep inelastic e^+ p scattering at HERA to constrain the parameters of a Randall-Sundrum-type scenario of quantum gravity with a small extra dimension and a non-factorable geometry.
|
hep-ph/9807246
|
Konstantin
|
Hsin-Chia Cheng, Bogdan A. Dobrescu and Konstantin T. Matchev
(Fermilab)
|
A Chiral Supersymmetric Standard Model
|
13 pages, 1 figure, LaTeX
|
Phys.Lett.B439:301-308,1998
|
10.1016/S0370-2693(98)01052-1
|
FERMILAB-PUB-98/205-T
|
hep-ph
| null |
We propose a supersymmetric extension of the Standard Model with an extra
U(1) gauge symmetry, so that all supersymmetric mass terms, including the
$\mu$-term, are forbidden by the gauge symmetries. Supersymmetry is broken
dynamically which results in U(1) breaking and generation of realistic $\mu$
term and soft breaking masses. The additional fields required to cancel the
U(1) anomalies are identified with the messengers of supersymmetry breaking.
The gaugino masses arise as in the usual gauge mediated scenario, while squarks
and sleptons receive their masses from both the U(1) $D$-term and the two-loop
gauge mediation contributions. The scale of supersymmetry breaking in this
model can be below $10^6$ GeV, yielding collider signatures with decays to
goldstinos inside the detector.
|
[
{
"created": "Fri, 3 Jul 1998 21:05:21 GMT",
"version": "v1"
}
] |
2009-10-09
|
[
[
"Cheng",
"Hsin-Chia",
"",
"Fermilab"
],
[
"Dobrescu",
"Bogdan A.",
"",
"Fermilab"
],
[
"Matchev",
"Konstantin T.",
"",
"Fermilab"
]
] |
We propose a supersymmetric extension of the Standard Model with an extra U(1) gauge symmetry, so that all supersymmetric mass terms, including the $\mu$-term, are forbidden by the gauge symmetries. Supersymmetry is broken dynamically which results in U(1) breaking and generation of realistic $\mu$ term and soft breaking masses. The additional fields required to cancel the U(1) anomalies are identified with the messengers of supersymmetry breaking. The gaugino masses arise as in the usual gauge mediated scenario, while squarks and sleptons receive their masses from both the U(1) $D$-term and the two-loop gauge mediation contributions. The scale of supersymmetry breaking in this model can be below $10^6$ GeV, yielding collider signatures with decays to goldstinos inside the detector.
|
0705.4493
|
Francesco D'Eramo
|
Francesco D'Eramo (Scuola Normale Superiore)
|
Dark matter and Higgs boson physics
|
17 pages, 7 figures. v3: published version (small corrections)
|
Phys.Rev.D76:083522,2007
|
10.1103/PhysRevD.76.083522
| null |
hep-ph
| null |
A vector-like colorless fermion doublet and a singlet added to the Standard
Model allow a consistent interpretation of dark matter in terms of the lightest
neutral particle, as they may help in obtaining successful gauge coupling
unification. We analyze in detail the mass range of the lightest neutral
particle below the W mass, i.e. in a range of the parameters where the physics
of the Standard Model Higgs boson may be substantially affected either directly
or indirectly.
|
[
{
"created": "Thu, 31 May 2007 01:21:29 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Jul 2007 13:07:55 GMT",
"version": "v2"
},
{
"created": "Thu, 25 Oct 2007 21:42:17 GMT",
"version": "v3"
}
] |
2008-11-26
|
[
[
"D'Eramo",
"Francesco",
"",
"Scuola Normale Superiore"
]
] |
A vector-like colorless fermion doublet and a singlet added to the Standard Model allow a consistent interpretation of dark matter in terms of the lightest neutral particle, as they may help in obtaining successful gauge coupling unification. We analyze in detail the mass range of the lightest neutral particle below the W mass, i.e. in a range of the parameters where the physics of the Standard Model Higgs boson may be substantially affected either directly or indirectly.
|
1105.3786
|
Milton Slaughter
|
Milton Dean Slaughter
|
$\Omega^-$, $\Xi^{*-}$, $\Sigma^{*-}}$ and $\Delta^-}$ decuplet baryon
electric charge form factor $F_1(q^2)$
|
corrected typos in Eqs. (2) and (10)
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The magnetic moment---a function of the electric charge form factor
$F_{1}(q^{2})$ and the magnetic dipole form factor $F_{2}(q^{2})$ at zero
four-momentum transfer $q^{2}$---of the ground-state $U$-spin =3/2 baryon
decuplet $\Delta^{-}$, $\Xi^{*\,-}$, $\Sigma^{*\,-}$ and $\Omega^{-}$ and their
ground-state spin 1/2 cousins $p$, $n$, $\Lambda$, $\Sigma^{+}$, $\Sigma^{0}$,
$\Sigma^{-}$, $\Xi^{+}$, and $\Xi^{-}$ have been studied for many years with a
modicum of success---only the magnetic moment of the $\Omega^{-}$ has been
accurately determined. In a recent study by us utilizing the infinite momentum
frame, we calculated the magnetic moments of the \emph{physical} decuplet
$U$-Spin =3/2 quartet members in terms of that of the $\Omega^{-}$ without
ascribing any specific form to their quark structure or intra-quark
interactions. That study determined $F_{2}(q^{2})$ and was conducted
nonperturbatively where the decuplet baryon momenta were all collinear. In this
follow-up research---again utilizing the infinite momentum frame but now
allowing for non-collinear momenta---we are able to determine $F_{1}(q^{2})$
where $q^{2}\leq 0$. We relate the electric charge form factor $F_{1}(q^{2})$
of the \emph{physical} decuplet $S\neq -3$, $U$-spin =3/2 quartet members to
that of the $\Omega^{-}$ ($S=-3$).
|
[
{
"created": "Thu, 19 May 2011 03:35:47 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Aug 2011 21:17:38 GMT",
"version": "v2"
}
] |
2011-08-23
|
[
[
"Slaughter",
"Milton Dean",
""
]
] |
The magnetic moment---a function of the electric charge form factor $F_{1}(q^{2})$ and the magnetic dipole form factor $F_{2}(q^{2})$ at zero four-momentum transfer $q^{2}$---of the ground-state $U$-spin =3/2 baryon decuplet $\Delta^{-}$, $\Xi^{*\,-}$, $\Sigma^{*\,-}$ and $\Omega^{-}$ and their ground-state spin 1/2 cousins $p$, $n$, $\Lambda$, $\Sigma^{+}$, $\Sigma^{0}$, $\Sigma^{-}$, $\Xi^{+}$, and $\Xi^{-}$ have been studied for many years with a modicum of success---only the magnetic moment of the $\Omega^{-}$ has been accurately determined. In a recent study by us utilizing the infinite momentum frame, we calculated the magnetic moments of the \emph{physical} decuplet $U$-Spin =3/2 quartet members in terms of that of the $\Omega^{-}$ without ascribing any specific form to their quark structure or intra-quark interactions. That study determined $F_{2}(q^{2})$ and was conducted nonperturbatively where the decuplet baryon momenta were all collinear. In this follow-up research---again utilizing the infinite momentum frame but now allowing for non-collinear momenta---we are able to determine $F_{1}(q^{2})$ where $q^{2}\leq 0$. We relate the electric charge form factor $F_{1}(q^{2})$ of the \emph{physical} decuplet $S\neq -3$, $U$-spin =3/2 quartet members to that of the $\Omega^{-}$ ($S=-3$).
|
1910.10160
|
Gowri Kurup
|
Sungwoo Hong, Gowri Kurup and Maxim Perelstein
|
Conformal Freeze-In of Dark Matter
|
6 + 2 pages, 3 figures. Minor changes; version to be published in PRD
| null |
10.1103/PhysRevD.101.095037
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present the conformal freeze-in (COFI) scenario for dark matter
production. At high energies, the dark sector is described by a gauge theory
flowing towards a Banks-Zaks fixed point, coupled to the standard model via a
non-renormalizable portal interaction. At the time when the dark sector is
populated in the early universe, it is described by a strongly coupled
conformal field theory. As the universe cools, cosmological phase transitions
in the standard model sector, either electroweak or QCD, induce conformal
symmetry breaking and confinement in the dark sector. One of the resulting dark
bound states is stable on the cosmological time scales and plays the role of
dark matter. With the Higgs portal, the COFI scenario provides a viable dark
matter candidate with mass in a phenomenologically interesting 0.1-1 MeV range.
With the quark portal, a dark matter candidate with mass around 1 keV is
consistent with observations. Conformal bootstrap puts a non-trivial constraint
on model building in this case.
|
[
{
"created": "Tue, 22 Oct 2019 18:00:02 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Apr 2020 03:02:29 GMT",
"version": "v2"
}
] |
2020-06-24
|
[
[
"Hong",
"Sungwoo",
""
],
[
"Kurup",
"Gowri",
""
],
[
"Perelstein",
"Maxim",
""
]
] |
We present the conformal freeze-in (COFI) scenario for dark matter production. At high energies, the dark sector is described by a gauge theory flowing towards a Banks-Zaks fixed point, coupled to the standard model via a non-renormalizable portal interaction. At the time when the dark sector is populated in the early universe, it is described by a strongly coupled conformal field theory. As the universe cools, cosmological phase transitions in the standard model sector, either electroweak or QCD, induce conformal symmetry breaking and confinement in the dark sector. One of the resulting dark bound states is stable on the cosmological time scales and plays the role of dark matter. With the Higgs portal, the COFI scenario provides a viable dark matter candidate with mass in a phenomenologically interesting 0.1-1 MeV range. With the quark portal, a dark matter candidate with mass around 1 keV is consistent with observations. Conformal bootstrap puts a non-trivial constraint on model building in this case.
|
1009.5137
|
Bill Dalton
|
Bill Dalton
|
Absence of Right-Handed Neutrino in Weak Interactions: Explanation via
Nonlinear Electroweak Model
| null | null | null | null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The nonlinear SU(2) electroweak model is used to explain the absence of the
right-handed neutrino in weak interactions. Two covariant eigenvalue
constraints which affect the transformation lead to two classes of right-handed
leptons, and make possible invariant mass terms without the Higgs doublet. A
covariant picture of neutrinos with mass is presented. A new invariant form for
the boson potentials is described in which the boson mass terms arises via the
adjoint field. This model also indicates a different region of matter involving
coupled leptons that are "blind" to the massless electromagnetic field but
"see" four massive potentials that are themselves blind to the electromagnetic
field. We argue that these more difficult to detect "dark" fields provide a
possible contribution to the missing mass.
|
[
{
"created": "Mon, 21 Jun 2010 21:04:07 GMT",
"version": "v1"
}
] |
2010-09-28
|
[
[
"Dalton",
"Bill",
""
]
] |
The nonlinear SU(2) electroweak model is used to explain the absence of the right-handed neutrino in weak interactions. Two covariant eigenvalue constraints which affect the transformation lead to two classes of right-handed leptons, and make possible invariant mass terms without the Higgs doublet. A covariant picture of neutrinos with mass is presented. A new invariant form for the boson potentials is described in which the boson mass terms arises via the adjoint field. This model also indicates a different region of matter involving coupled leptons that are "blind" to the massless electromagnetic field but "see" four massive potentials that are themselves blind to the electromagnetic field. We argue that these more difficult to detect "dark" fields provide a possible contribution to the missing mass.
|
0906.1904
|
Maxim Konyushikhin
|
Maxim Konyushikhin
|
Four-point vector correlators and AdS/QCD correspondence
|
7 pages, 1 figure
|
JETP Lett.91:441-446,2010
|
10.1134/S002136401009002X
| null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We derive the four-point vector correlators in QCD from AdS/QCD
correspondence. It is shown that meson poles are correctly reproduced. The
final expression also suggests a nonzero amplitude in the limit of zero
virtuality of two longitudinal gluons. This fact does not mean that one can
produce, absorb or scatter real longitudinal gluons.
|
[
{
"created": "Wed, 10 Jun 2009 10:40:13 GMT",
"version": "v1"
},
{
"created": "Sun, 28 Jun 2009 12:14:50 GMT",
"version": "v2"
},
{
"created": "Mon, 26 Apr 2010 12:50:29 GMT",
"version": "v3"
}
] |
2014-11-20
|
[
[
"Konyushikhin",
"Maxim",
""
]
] |
We derive the four-point vector correlators in QCD from AdS/QCD correspondence. It is shown that meson poles are correctly reproduced. The final expression also suggests a nonzero amplitude in the limit of zero virtuality of two longitudinal gluons. This fact does not mean that one can produce, absorb or scatter real longitudinal gluons.
|
1202.1368
|
Renata Jora
|
Renata Jora
|
Do we need Feynman diagrams for higher orders perturbation theory?
|
version published in Phys. Lett. B
| null |
10.1016/j.physletb.2012.05.047
| null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We compute the two and three loop corrections to the beta function for
Yang-Mills theories in the background gauge field method and using the
background gauge field as the only source. The calculations are based on the
separation of the one loop effective potential into zero and positive modes and
are entirely analytical. No two or three loop Feynman diagrams are considered
in the process.
|
[
{
"created": "Tue, 7 Feb 2012 08:14:02 GMT",
"version": "v1"
},
{
"created": "Wed, 23 May 2012 14:08:46 GMT",
"version": "v2"
},
{
"created": "Thu, 24 May 2012 04:33:17 GMT",
"version": "v3"
},
{
"created": "Tue, 5 Jun 2012 05:43:06 GMT",
"version": "v4"
}
] |
2015-06-04
|
[
[
"Jora",
"Renata",
""
]
] |
We compute the two and three loop corrections to the beta function for Yang-Mills theories in the background gauge field method and using the background gauge field as the only source. The calculations are based on the separation of the one loop effective potential into zero and positive modes and are entirely analytical. No two or three loop Feynman diagrams are considered in the process.
|
0708.3804
|
Xiao-Ming Xu
|
Xiao-Ming Xu, Ru Peng
|
Free Quarks and Antiquarks versus Hadronic Matter
|
9 pages, 3 figures
|
Chin. Phys. C33 (2009) 748
|
10.1088/1674-1137/33/9/007
| null |
hep-ph nucl-th
| null |
Meson-meson reactions A(q_1 \bar{q}_1) + B(q_2 \bar{q}_2) to q_1 + \bar{q}_1
+ q_2 + \bar{q}_2 in high-temperature hadronic matter are found to produce an
appreciable amount of quarks and antiquarks freely moving in hadronic matter
and to establish a new mechanism for deconfinement of quarks and antiquarks in
hadronic matter.
|
[
{
"created": "Tue, 28 Aug 2007 14:04:09 GMT",
"version": "v1"
}
] |
2015-05-13
|
[
[
"Xu",
"Xiao-Ming",
""
],
[
"Peng",
"Ru",
""
]
] |
Meson-meson reactions A(q_1 \bar{q}_1) + B(q_2 \bar{q}_2) to q_1 + \bar{q}_1 + q_2 + \bar{q}_2 in high-temperature hadronic matter are found to produce an appreciable amount of quarks and antiquarks freely moving in hadronic matter and to establish a new mechanism for deconfinement of quarks and antiquarks in hadronic matter.
|
hep-ph/0207285
|
Fazal-e-Aleem
|
Fazal-e-Aleem and Sohail Afzal Tahir
|
Recent Results For Rho And Odderon Picture
| null | null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This has critical errors
|
[
{
"created": "Tue, 23 Jul 2002 17:12:11 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Jan 2010 06:27:53 GMT",
"version": "v2"
}
] |
2010-01-04
|
[
[
"Fazal-e-Aleem",
"",
""
],
[
"Tahir",
"Sohail Afzal",
""
]
] |
This has critical errors
|
2304.13999
|
Muzi Hong
|
Muzi Hong, Kohei Kamada, Jun'ichi Yokoyama
|
Baryogenesis from sphaleron decoupling
|
16 pages, 5 figures
|
Phys.Rev.D 108 (2023) 6, 063502
|
10.1103/PhysRevD.108.063502
|
RESCEU-9/23
|
hep-ph astro-ph.CO
|
http://creativecommons.org/licenses/by/4.0/
|
The electroweak sphaleron process breaks the baryon number conservation
within the realms of the Standard Model of particle physics (SM). Recently, it
is pointed out that its decoupling may provide the out-of-equilibrium condition
required for baryogenesis. In this paper, we study such a scenario taking into
account the baryon-number wash-out effect of the sphaleron itself to improve
the estimate. We clarify the amount of CP violation required for this scenario
to explain the observed asymmetry.
|
[
{
"created": "Thu, 27 Apr 2023 07:37:41 GMT",
"version": "v1"
}
] |
2024-06-18
|
[
[
"Hong",
"Muzi",
""
],
[
"Kamada",
"Kohei",
""
],
[
"Yokoyama",
"Jun'ichi",
""
]
] |
The electroweak sphaleron process breaks the baryon number conservation within the realms of the Standard Model of particle physics (SM). Recently, it is pointed out that its decoupling may provide the out-of-equilibrium condition required for baryogenesis. In this paper, we study such a scenario taking into account the baryon-number wash-out effect of the sphaleron itself to improve the estimate. We clarify the amount of CP violation required for this scenario to explain the observed asymmetry.
|
1207.1128
|
Encieh Erfani
|
Athanasios Chatzistavrakidis, Encieh Erfani, Hans Peter Nilles, Ivonne
Zavala
|
Axiology
|
21 pages, 1 figure, one ref. added, version published in JCAP
|
JCAP09(2012)006
|
10.1088/1475-7516/2012/09/006
| null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Axions might play a crucial role for the solution of the strong CP-problem
and explanation of cold dark matter in the universe. In addition they may find
applications in the formulation of inflationary models for the early universe
and can serve as candidates for quintessence. We show that all these phenomena
can be described within a single framework exhibiting a specific pattern of
mass scales: the axionic see-saw. We also discuss the role of supersymmetry
(susy) in this axionic system in two specific examples: weak scale susy in the
(multi) TeV range and tele-susy with a breakdown scale coinciding with the
decay constant of the QCD axion: $f_a\sim 10^{11}-10^{12}$ GeV.
|
[
{
"created": "Wed, 4 Jul 2012 21:23:36 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Sep 2012 19:26:18 GMT",
"version": "v2"
}
] |
2012-09-06
|
[
[
"Chatzistavrakidis",
"Athanasios",
""
],
[
"Erfani",
"Encieh",
""
],
[
"Nilles",
"Hans Peter",
""
],
[
"Zavala",
"Ivonne",
""
]
] |
Axions might play a crucial role for the solution of the strong CP-problem and explanation of cold dark matter in the universe. In addition they may find applications in the formulation of inflationary models for the early universe and can serve as candidates for quintessence. We show that all these phenomena can be described within a single framework exhibiting a specific pattern of mass scales: the axionic see-saw. We also discuss the role of supersymmetry (susy) in this axionic system in two specific examples: weak scale susy in the (multi) TeV range and tele-susy with a breakdown scale coinciding with the decay constant of the QCD axion: $f_a\sim 10^{11}-10^{12}$ GeV.
|
1711.06087
|
Rados{\l}aw Kycia
|
R. A. Kycia, J. Turnau, J. J. Chwastowski, R. Staszewski, M.
Trzebi\'nski
|
The adaptive Monte Carlo toolbox for phase space integration and
generation
|
18 pages, 4 figures, 5 tables
|
Commun. Comput. Phys., 25 (2019), pp. 1547-1563
|
10.4208/cicp.OA-2018-0028
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
An implementation of the Monte Carlo (MC) phase space generators coupled with
adaptive MC integration/simulation program FOAM is presented. The first program
is a modification of the classic phase space generator GENBOD interfaced with
the adaptive sampling integrator/generator FOAM. On top of this tool the
algorithm suitable for generation of the phase space for an reaction with two
leading particles is presented (double-peripheral process with central
production of particles). At the same time it serves as an instructive example
of construction of a self-adaptive phase space generator/integrator with a
modular structure for specialized particle physics calculations.
|
[
{
"created": "Thu, 16 Nov 2017 13:53:51 GMT",
"version": "v1"
}
] |
2019-04-02
|
[
[
"Kycia",
"R. A.",
""
],
[
"Turnau",
"J.",
""
],
[
"Chwastowski",
"J. J.",
""
],
[
"Staszewski",
"R.",
""
],
[
"Trzebiński",
"M.",
""
]
] |
An implementation of the Monte Carlo (MC) phase space generators coupled with adaptive MC integration/simulation program FOAM is presented. The first program is a modification of the classic phase space generator GENBOD interfaced with the adaptive sampling integrator/generator FOAM. On top of this tool the algorithm suitable for generation of the phase space for an reaction with two leading particles is presented (double-peripheral process with central production of particles). At the same time it serves as an instructive example of construction of a self-adaptive phase space generator/integrator with a modular structure for specialized particle physics calculations.
|
hep-ph/0212266
|
Enrico Nardi
|
Enrico Nardi
|
On the neutrino vector and axial vector charge radius
|
8 pages, 3 eps figures. Talk given in the X Mexican School of
Particles and Fields, Playa del Carmen, Mexico, October 30 - November 6,
2002. Based in part on hep-ph/0210137 written in collaboration with M. Hirsch
and D. A. Restrepo
|
AIP Conf.Proc. 670 (2003) 118-131
|
10.1063/1.1594325
| null |
hep-ph
| null |
A Majorana neutrino is characterized by just one flavor diagonal
electromagnetic form factor: the anapole moment, that in the static limit
corresponds to the axial vector charge radius <r^2_A>. As is the case for the
vector charge radius of a Dirac neutrino, proving that this is a well defined
physical quantity is non trivial. I will first describe briefly the origin of
the long standing controversy about the physical or non physical nature of the
neutrino charge radius. Then I will argue that, in contrast to Dirac neutrino
electromagnetic form factors, for Majorana neutrinos cosmological and
astrophysical arguments do not provide useful informations on <r^2_A>, and
therefore this quantity has to be studied by means of terrestrial experiment.
Finally, I will discuss the constraints that can be derived on <r^2_A> for the
tau neutrino from a comprehensive analysis of the data on single photon
production off Z-resonance, and I will conclude with a few comments on
$\nu_\mu$ scattering data from the NuTeV, E734, CCFR and CHARM-II
collaborations and on the limits implied for <r^2_A> for the muon neutrino.
|
[
{
"created": "Wed, 18 Dec 2002 17:46:26 GMT",
"version": "v1"
}
] |
2009-11-07
|
[
[
"Nardi",
"Enrico",
""
]
] |
A Majorana neutrino is characterized by just one flavor diagonal electromagnetic form factor: the anapole moment, that in the static limit corresponds to the axial vector charge radius <r^2_A>. As is the case for the vector charge radius of a Dirac neutrino, proving that this is a well defined physical quantity is non trivial. I will first describe briefly the origin of the long standing controversy about the physical or non physical nature of the neutrino charge radius. Then I will argue that, in contrast to Dirac neutrino electromagnetic form factors, for Majorana neutrinos cosmological and astrophysical arguments do not provide useful informations on <r^2_A>, and therefore this quantity has to be studied by means of terrestrial experiment. Finally, I will discuss the constraints that can be derived on <r^2_A> for the tau neutrino from a comprehensive analysis of the data on single photon production off Z-resonance, and I will conclude with a few comments on $\nu_\mu$ scattering data from the NuTeV, E734, CCFR and CHARM-II collaborations and on the limits implied for <r^2_A> for the muon neutrino.
|
hep-ph/0601054
|
Cecilia Lunardini
|
Cecilia Lunardini
|
The diffuse neutrino flux from supernovae: upper limit on the electron
neutrino component from the non-observation of antineutrinos at
SuperKamiokande
|
LaTeX, 5 pages, 1 figure. Paper is modified in the presentation (Fig.
1 was replaced with a different plot and Table 1 was expanded), with
unchanged results. References added and corrected
|
Phys.Rev. D73 (2006) 083009
|
10.1103/PhysRevD.73.083009
| null |
hep-ph astro-ph hep-ex
| null |
I derive an upper bound on the electron neutrino component of the diffuse
supernova neutrino flux from the constraint on the antineutrino component at
SuperKamiokande. The connection between antineutrino and neutrino channels is
due to the similarity of the muon and tau neutrino and antineutrino fluxes
produced in a supernova, and to the conversion of these species into electron
neutrinos and antineutrinos inside the star. The limit on the electron neutrino
flux is 5.5 cm^-2 s^-1 above 19.3 MeV of neutrino energy, and is stronger than
the direct limit from Mont Blanc by three orders of magnitude. It represents
the minimal sensitivity required at future direct searches, and is intriguingly
close to the reach of the Sudbury Neutrino Observatory (SNO) and of the ICARUS
experiment. The electron neutrino flux will have a lower bound if the electron
antineutrino flux is measured. Indicatively, the first can be smaller than the
second at most by a factor of 2-3 depending on the details of the neutrino
spectra at production.
|
[
{
"created": "Sun, 8 Jan 2006 19:02:13 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Apr 2006 18:37:39 GMT",
"version": "v2"
}
] |
2009-11-11
|
[
[
"Lunardini",
"Cecilia",
""
]
] |
I derive an upper bound on the electron neutrino component of the diffuse supernova neutrino flux from the constraint on the antineutrino component at SuperKamiokande. The connection between antineutrino and neutrino channels is due to the similarity of the muon and tau neutrino and antineutrino fluxes produced in a supernova, and to the conversion of these species into electron neutrinos and antineutrinos inside the star. The limit on the electron neutrino flux is 5.5 cm^-2 s^-1 above 19.3 MeV of neutrino energy, and is stronger than the direct limit from Mont Blanc by three orders of magnitude. It represents the minimal sensitivity required at future direct searches, and is intriguingly close to the reach of the Sudbury Neutrino Observatory (SNO) and of the ICARUS experiment. The electron neutrino flux will have a lower bound if the electron antineutrino flux is measured. Indicatively, the first can be smaller than the second at most by a factor of 2-3 depending on the details of the neutrino spectra at production.
|
1512.01560
|
Fabrizio Senia
|
Riccardo Barbieri, Gino Isidori, Andrea Pattori, Fabrizio Senia
|
Anomalies in $B$-decays and $U(2)$ flavour symmetry
|
16 pages, 4 figures
| null |
10.1140/epjc/s10052-016-3905-3
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The collection of a few anomalies in semileptonic $B$-decays invites to
speculate about the emergence of some strikingly new phenomena. Here we offer a
possible interpretation of these anomalies in the context of a weakly broken
$U(2)^5$ flavour symmetry and lepto-quark mediators.
|
[
{
"created": "Fri, 4 Dec 2015 21:02:23 GMT",
"version": "v1"
}
] |
2016-03-23
|
[
[
"Barbieri",
"Riccardo",
""
],
[
"Isidori",
"Gino",
""
],
[
"Pattori",
"Andrea",
""
],
[
"Senia",
"Fabrizio",
""
]
] |
The collection of a few anomalies in semileptonic $B$-decays invites to speculate about the emergence of some strikingly new phenomena. Here we offer a possible interpretation of these anomalies in the context of a weakly broken $U(2)^5$ flavour symmetry and lepto-quark mediators.
|
1912.05900
|
Mario W. Barela
|
Mario W. Barela and V. Pleitez
|
Trimuon production at the LHC
|
4 pages, 4 figures. Version matches with the published version
|
Phys. Rev. D 101, 015024 (2020)
|
10.1103/PhysRevD.101.015024
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
No process without a standard model (SM) background has been observed so far.
As a tool in the study of a class of models containing doubly charged vector
bileptons, we propose one such process that, violating lepton flavor number
conservation, has no contribution from the SM: $pp\to \mu^+\mu^+\mu^- e^-$. By
carefully isolating the parameters to keep them free, we are able to acquire a
notion of how a possible PMNS-like matrix present in the relevant charged
current parametrization could affect the observables. We find that an
interesting section of the space of parameters can be explored at the current
LHC in the specified conditions.
|
[
{
"created": "Thu, 12 Dec 2019 12:48:17 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Jan 2020 02:04:48 GMT",
"version": "v2"
},
{
"created": "Wed, 29 Jan 2020 02:24:09 GMT",
"version": "v3"
}
] |
2020-02-05
|
[
[
"Barela",
"Mario W.",
""
],
[
"Pleitez",
"V.",
""
]
] |
No process without a standard model (SM) background has been observed so far. As a tool in the study of a class of models containing doubly charged vector bileptons, we propose one such process that, violating lepton flavor number conservation, has no contribution from the SM: $pp\to \mu^+\mu^+\mu^- e^-$. By carefully isolating the parameters to keep them free, we are able to acquire a notion of how a possible PMNS-like matrix present in the relevant charged current parametrization could affect the observables. We find that an interesting section of the space of parameters can be explored at the current LHC in the specified conditions.
|
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