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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1206.3934 | Banafsheh Forghan | Banafsheh Forghan | Krein Regularization of \lambda\phi^4 | null | International Journal of Theoretical Physics: Volume 51, Issue 5
(2012), Page 1503-1508 | 10.1007/s10773-011-1026-1 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the four-point function in \lambda\phi^4 theory by using Krein
regularization and compare our result, which is finite, with the usual result
in \lambda\phi^4 theory. The effective coupling constant (\lambda_\mu) is also
calculated in this method.
| [
{
"created": "Fri, 27 Apr 2012 14:01:22 GMT",
"version": "v1"
}
] | 2012-06-19 | [
[
"Forghan",
"Banafsheh",
""
]
] | We calculate the four-point function in \lambda\phi^4 theory by using Krein regularization and compare our result, which is finite, with the usual result in \lambda\phi^4 theory. The effective coupling constant (\lambda_\mu) is also calculated in this method. |
1504.00683 | Nobuchika Okada | Nobuchika Okada and Satomi Okada | Simple brane-world inflationary models: an update | 17 pages, 7 figures, an update of arXiv:1407.3544 with Planck 2015
results, typos corrected, new references added. arXiv admin note: substantial
text overlap with arXiv:1412.8466 | null | 10.1142/S0217751X16500780 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the light of the Planck 2015 results, we update simple inflationary models
based on the quadratic, quartic, Higgs and Coleman-Weinberg potentials in the
context of the Randall-Sundrum brane-world cosmology. Brane-world cosmological
effect alters the inflationary predictions of the spectral index ($n_s$) and
the tensor-to-scalar ratio ($r$) from those obtained in the standard cosmology.
In particular, the tensor-to-scalar ratio is enhanced in the presence of the
5th dimension. In order to maintain the consistency with the Planck 2015
results for the inflationary predictions in the standard cosmology, we find a
lower bound on the five-dimensional Planck mass ($M_5$). On the other hand, the
inflationary predictions laying outside of the Planck allowed region can be
pushed into the allowed region by the brane-world cosmological effect with a
suitable choice of $M_5$.
| [
{
"created": "Tue, 31 Mar 2015 19:56:27 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Apr 2015 21:46:41 GMT",
"version": "v2"
}
] | 2016-06-01 | [
[
"Okada",
"Nobuchika",
""
],
[
"Okada",
"Satomi",
""
]
] | In the light of the Planck 2015 results, we update simple inflationary models based on the quadratic, quartic, Higgs and Coleman-Weinberg potentials in the context of the Randall-Sundrum brane-world cosmology. Brane-world cosmological effect alters the inflationary predictions of the spectral index ($n_s$) and the tensor-to-scalar ratio ($r$) from those obtained in the standard cosmology. In particular, the tensor-to-scalar ratio is enhanced in the presence of the 5th dimension. In order to maintain the consistency with the Planck 2015 results for the inflationary predictions in the standard cosmology, we find a lower bound on the five-dimensional Planck mass ($M_5$). On the other hand, the inflationary predictions laying outside of the Planck allowed region can be pushed into the allowed region by the brane-world cosmological effect with a suitable choice of $M_5$. |
1604.00179 | Falk Wunderlich | Falk Wunderlich, Roman Yaresko, Burkhard Kampfer | Arguing on entropic and enthalpic first-order phase transitions in
strongly interacting matter | 13 pages, 5 figures | null | 10.4236/jmp.2016.78077 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The pattern of isentropes in the vicinity of a first-order phase transition
is proposed as a key for a sub-classification. While the
confinement--deconfinement transition, conjectured to set in beyond a critical
end point in the QCD phase diagram, is often related to an entropic transition
and the apparently settled gas-liquid transition in nuclear matter is an
enthalphic transition, the conceivable local isentropes w.r.t.\ "incoming" or
"outgoing" serve as another useful guide for discussing possible implications,
both in the presumed hydrodynamical expansion stage of heavy-ion collisions and
the core-collapse of supernova explosions. Examples, such as the quark-meson
model and two-phase models, are shown to distinguish concisely the different
transitions.
| [
{
"created": "Fri, 1 Apr 2016 09:47:51 GMT",
"version": "v1"
}
] | 2016-05-25 | [
[
"Wunderlich",
"Falk",
""
],
[
"Yaresko",
"Roman",
""
],
[
"Kampfer",
"Burkhard",
""
]
] | The pattern of isentropes in the vicinity of a first-order phase transition is proposed as a key for a sub-classification. While the confinement--deconfinement transition, conjectured to set in beyond a critical end point in the QCD phase diagram, is often related to an entropic transition and the apparently settled gas-liquid transition in nuclear matter is an enthalphic transition, the conceivable local isentropes w.r.t.\ "incoming" or "outgoing" serve as another useful guide for discussing possible implications, both in the presumed hydrodynamical expansion stage of heavy-ion collisions and the core-collapse of supernova explosions. Examples, such as the quark-meson model and two-phase models, are shown to distinguish concisely the different transitions. |
2011.12181 | Le Tho Hue | T. Phong Nguyen, T.T. Thuc, D.T. Si, T.T.Hong, L. T. Hue | Low energy phenomena of the lepton sector in an $A_4$ symmetry model
with heavy inverse seesaw neutrinos | Matching the published version in PTEP | PTEP 2022 (2022) 023B01 | 10.1093/ptep/ptac002 | null | hep-ph | http://creativecommons.org/publicdomain/zero/1.0/ | An extension of the two Higgs doublet model including inverse seesaw
neutrinos and neutral Higgs bosons was constructed based on the $A_4$ symmetry
in order to explain the recent neutrino oscillation data. This model can
distinguish two well-known normal and inverted order schemes of neutrino data
once both the effective masses $m_{\beta}$ in tritium beta decays and $\langle
m\rangle$ in the neutrinoless double beta decay are observed. The lepton flavor
violating decays of the charged leptons $e_b\rightarrow e_a\gamma$,
$\mu\rightarrow3e$, the Standard model-like Higgs boson decays $h\rightarrow
e_be_a$, and the $\mu$-e conversions in some nuclei are generated from loop
corrections. The experimental data of the branching ratio Br$(\mu\rightarrow
e\gamma, 3e)$ predict that the upper bounds of Br$(\tau \rightarrow
\mu\gamma,e\gamma)$ and Br$(h\rightarrow e_{a}e_b)$ are much smaller than the
planned experimental sensitivities. In contrast, the $\mu$-e conversions are
the promising signals for experiments.
| [
{
"created": "Tue, 24 Nov 2020 15:57:43 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Feb 2022 08:24:55 GMT",
"version": "v2"
}
] | 2022-02-18 | [
[
"Nguyen",
"T. Phong",
""
],
[
"Thuc",
"T. T.",
""
],
[
"Si",
"D. T.",
""
],
[
"Hong",
"T. T.",
""
],
[
"Hue",
"L. T.",
""
]
] | An extension of the two Higgs doublet model including inverse seesaw neutrinos and neutral Higgs bosons was constructed based on the $A_4$ symmetry in order to explain the recent neutrino oscillation data. This model can distinguish two well-known normal and inverted order schemes of neutrino data once both the effective masses $m_{\beta}$ in tritium beta decays and $\langle m\rangle$ in the neutrinoless double beta decay are observed. The lepton flavor violating decays of the charged leptons $e_b\rightarrow e_a\gamma$, $\mu\rightarrow3e$, the Standard model-like Higgs boson decays $h\rightarrow e_be_a$, and the $\mu$-e conversions in some nuclei are generated from loop corrections. The experimental data of the branching ratio Br$(\mu\rightarrow e\gamma, 3e)$ predict that the upper bounds of Br$(\tau \rightarrow \mu\gamma,e\gamma)$ and Br$(h\rightarrow e_{a}e_b)$ are much smaller than the planned experimental sensitivities. In contrast, the $\mu$-e conversions are the promising signals for experiments. |
hep-ph/0403273 | Enqvist Kari | Kari Enqvist | Curvatons in the minimally supersymmetric standard model | 16 pages, 1 Figure | Mod.Phys.Lett. A19 (2004) 1421-1434 | 10.1142/S0217732304013970 | HIP-2004-10/TH | hep-ph | null | Curvaton is an effectively massless field whose energy density during
inflation is negligible but which later becomes dominant. This is a novel
mechanism to generate the scale invariant perturbations. I discuss the
possibility that the curvaton could be found among the fields of the minimally
supersymmetric standard model (MSSM), which contains a number of flat
directions along which the renormalizable potential vanishes. The requirements
of late domination and the absence of damping of the perturbations pick out
essentially a unique candidate for the MSSM curvaton. One must also require
that inflation takes place in a hidden sector. If the inflaton energy density
can be radiated into extra dimensions, many constraints can be relaxed, and the
simplest flat direction consisting of the Higgses H_u and H_d would provide a
working example of an MSSM curvaton.
| [
{
"created": "Fri, 26 Mar 2004 22:13:01 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Apr 2004 06:50:06 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Enqvist",
"Kari",
""
]
] | Curvaton is an effectively massless field whose energy density during inflation is negligible but which later becomes dominant. This is a novel mechanism to generate the scale invariant perturbations. I discuss the possibility that the curvaton could be found among the fields of the minimally supersymmetric standard model (MSSM), which contains a number of flat directions along which the renormalizable potential vanishes. The requirements of late domination and the absence of damping of the perturbations pick out essentially a unique candidate for the MSSM curvaton. One must also require that inflation takes place in a hidden sector. If the inflaton energy density can be radiated into extra dimensions, many constraints can be relaxed, and the simplest flat direction consisting of the Higgses H_u and H_d would provide a working example of an MSSM curvaton. |
0708.3364 | Jonathan Bagger | Jonathan A. Bagger and Adam F. Falk | Decoupling and Destabilizing in Spontaneously Broken Supersymmetry | Letex, 7 pages | Phys.Rev.D76:105026,2007 | 10.1103/PhysRevD.76.105026 | null | hep-ph hep-th | null | The supersymmetric analog of the Goldberger-Treiman relation plays a critical
role in the low energy effective theory of models in which supersymmetry is
spontaneously broken in a hidden sector. The interactions that connect the
hidden and visible sectors break a global symmetry, which implies that the low
energy theory must be constructed consistently in inverse powers of the
messenger scale. The Goldberger-Treiman relation determines the couplings of
the Goldstino to the visible sector fields. These couplings are fixed by the
soft supersymmetry breaking terms within a power counting scheme that is stable
under radiative corrections. We describe the power counting of the low energy
effective theory, first for a toy model of extended technicolor and then for
the supersymmetric standard model. One implication of this work for
supersymmetry phenomenology is the observation that Goldstino loops can
destabilize the weak scale if the low energy theory is not constructed
consistently. Another is that Goldstino loops induce all visible sector
operators not forbidden by symmetries. The magnitudes of these operators are
determined by the consistent power counting of the low energy effective theory.
| [
{
"created": "Fri, 24 Aug 2007 16:02:05 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Bagger",
"Jonathan A.",
""
],
[
"Falk",
"Adam F.",
""
]
] | The supersymmetric analog of the Goldberger-Treiman relation plays a critical role in the low energy effective theory of models in which supersymmetry is spontaneously broken in a hidden sector. The interactions that connect the hidden and visible sectors break a global symmetry, which implies that the low energy theory must be constructed consistently in inverse powers of the messenger scale. The Goldberger-Treiman relation determines the couplings of the Goldstino to the visible sector fields. These couplings are fixed by the soft supersymmetry breaking terms within a power counting scheme that is stable under radiative corrections. We describe the power counting of the low energy effective theory, first for a toy model of extended technicolor and then for the supersymmetric standard model. One implication of this work for supersymmetry phenomenology is the observation that Goldstino loops can destabilize the weak scale if the low energy theory is not constructed consistently. Another is that Goldstino loops induce all visible sector operators not forbidden by symmetries. The magnitudes of these operators are determined by the consistent power counting of the low energy effective theory. |
1905.11309 | Nelson R. F. Braga | Nelson R. F. Braga and Luiz F. Ferreira | Quasinormal modes for quarkonium in a plasma with magnetic fields | 20 pages, 2 tables, 10 figures | null | 10.1016/j.physletb.2019.06.050 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Heavy vector mesons detected after a heavy ion collision are important
sources of information about the quark gluon plasma. The fraction of such
particles that survive the plasma phase and reach the detectors is related to
the dissociation degree inside the thermal medium. A consistent picture for the
thermal behavior of charmonium and bottomonium quasi-states in a thermal medium
was obtained recently using a holographic bottom up model. This model captures
the heavy flavour spectroscopy of masses and decay constants in the vacuum
(zero temperature) and is consistently extended to finite temperature. The
spectral functions that emerge provide a description of the dissociation
process in terms of the broadening of the quasi-state peaks with temperature.
The holographic approach makes it possible to determine also the quasinormal
modes. They are gravity solutions representing the quasi-particle states in the
thermal medium, with complex frequencies related to the thermal mass and width.
The quasinormal modes for charmonium and bottomonium have been studied very
recently and a consistent description of the dissociation process was found.
An additional factor can affect the dissociation process: strong magnetic
fields are expected to be present when the plasma is formed by non-central
heavy ion collisions. So, it is important to understand the effect of such
fields on the heavy meson dissociation scenario. Here we extend the holographic
determination of quasinormal modes for the case when magnetic fields are
present. The real and imaginary parts of the mode frequencies are determined
for different values of background $e B$ field. The associated dispersion
relations for heavy quarks moving inside the plasma are also investigated for
both $ c \bar c$ and $ b \bar b \, $.
| [
{
"created": "Mon, 27 May 2019 15:50:10 GMT",
"version": "v1"
}
] | 2019-07-24 | [
[
"Braga",
"Nelson R. F.",
""
],
[
"Ferreira",
"Luiz F.",
""
]
] | Heavy vector mesons detected after a heavy ion collision are important sources of information about the quark gluon plasma. The fraction of such particles that survive the plasma phase and reach the detectors is related to the dissociation degree inside the thermal medium. A consistent picture for the thermal behavior of charmonium and bottomonium quasi-states in a thermal medium was obtained recently using a holographic bottom up model. This model captures the heavy flavour spectroscopy of masses and decay constants in the vacuum (zero temperature) and is consistently extended to finite temperature. The spectral functions that emerge provide a description of the dissociation process in terms of the broadening of the quasi-state peaks with temperature. The holographic approach makes it possible to determine also the quasinormal modes. They are gravity solutions representing the quasi-particle states in the thermal medium, with complex frequencies related to the thermal mass and width. The quasinormal modes for charmonium and bottomonium have been studied very recently and a consistent description of the dissociation process was found. An additional factor can affect the dissociation process: strong magnetic fields are expected to be present when the plasma is formed by non-central heavy ion collisions. So, it is important to understand the effect of such fields on the heavy meson dissociation scenario. Here we extend the holographic determination of quasinormal modes for the case when magnetic fields are present. The real and imaginary parts of the mode frequencies are determined for different values of background $e B$ field. The associated dispersion relations for heavy quarks moving inside the plasma are also investigated for both $ c \bar c$ and $ b \bar b \, $. |
hep-ph/9710293 | Guest Account | S.V.Goloskokov | Spin Effects In Diffractive Processes at HERA | 3 pages, latex, 2 PS figures, talk at the lp DESY Working Group
meeting during the 2nd Topical Workshop Deep Inelastic Scattering off
Polarized Target: Theory Meets Experiment, DESY Zeuthen, September 1-5, 1997 | null | null | null | hep-ph | null | It is shown that the $A_{ll}$ asymmetry in diffractive $Q \bar Q$
leptoproduction is not small at HERA energies and dependent on the structure of
the pomeron couplings and on the masses of produced quarks. The connection of
this asymmetry with the non-forward gluon distribution in the proton is
discussed.
| [
{
"created": "Thu, 9 Oct 1997 09:38:12 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Goloskokov",
"S. V.",
""
]
] | It is shown that the $A_{ll}$ asymmetry in diffractive $Q \bar Q$ leptoproduction is not small at HERA energies and dependent on the structure of the pomeron couplings and on the masses of produced quarks. The connection of this asymmetry with the non-forward gluon distribution in the proton is discussed. |
hep-ph/0308319 | Stefan W. Bosch | Stefan W. Bosch | Factorization and Sudakov Resummation in B -> gamma l nu | 3 pages, 1 figure; contribution to proceedings of "International
Europhysics Conference on High Energy Physics" EPS (July 17th-23rd 2003) in
Aachen; to appear in European Physical Journal C direct | Eur.Phys.J.C33:s294-s296,2004 | 10.1140/epjcd/s2003-03-208-0 | CLNS 03/1842 | hep-ph | null | We apply Soft-Collinear Effective Theory to prove at leading power in
Lambda_QCD/m_b a factorization formula for the radiative leptonic decay B ->
gamma l nu. Large logarithms entering the hard-scattering kernel are
systematically resummed by a two-step perturbative matching procedure.
| [
{
"created": "Fri, 29 Aug 2003 17:35:22 GMT",
"version": "v1"
}
] | 2011-09-13 | [
[
"Bosch",
"Stefan W.",
""
]
] | We apply Soft-Collinear Effective Theory to prove at leading power in Lambda_QCD/m_b a factorization formula for the radiative leptonic decay B -> gamma l nu. Large logarithms entering the hard-scattering kernel are systematically resummed by a two-step perturbative matching procedure. |
0801.1566 | Aleksi Kurkela | Ph. de Forcrand, A.Kurkela, A.Vuorinen | Center-Symmetric Effective Theory for High-Temperature SU(2) Yang-Mills
Theory | 24 pages, 6 figures. v2: small clarifications and updates; published
version | Phys.Rev.D77:125014,2008 | 10.1103/PhysRevD.77.125014 | CERN-PH-TH/2008-007 | hep-ph hep-lat | null | We construct and study a dimensionally reduced effective theory for
high-temperature SU(2) Yang-Mills theory that respects all the symmetries of
the underlying theory. Our main motivation is to study, whether the correct
treatment of the center symmetry can help extend the applicability of the
dimensional reduction procedure towards the confinement transition. After
performing perturbative matching to the full theory at asymptotically high
temperatures, we map the phase diagram of the effective theory using
non-perturbative lattice simulations. We find that at lower temperature the
theory undergoes a second order confining phase transition, in complete analogy
with the full theory, which is a direct consequence of having incorporated the
center symmetry.
| [
{
"created": "Thu, 10 Jan 2008 20:57:00 GMT",
"version": "v1"
},
{
"created": "Tue, 6 May 2008 09:43:51 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"de Forcrand",
"Ph.",
""
],
[
"Kurkela",
"A.",
""
],
[
"Vuorinen",
"A.",
""
]
] | We construct and study a dimensionally reduced effective theory for high-temperature SU(2) Yang-Mills theory that respects all the symmetries of the underlying theory. Our main motivation is to study, whether the correct treatment of the center symmetry can help extend the applicability of the dimensional reduction procedure towards the confinement transition. After performing perturbative matching to the full theory at asymptotically high temperatures, we map the phase diagram of the effective theory using non-perturbative lattice simulations. We find that at lower temperature the theory undergoes a second order confining phase transition, in complete analogy with the full theory, which is a direct consequence of having incorporated the center symmetry. |
hep-ph/9504417 | null | Anirban Kundu | Electroweak Precision Data and a Heavy Z' | LaTeX file, includes postscript of two figures. Title changed in
published version. Replaces previous version. | Phys.Lett. B370 (1996) 135-140 | 10.1016/0370-2693(95)01559-0 | SINP-TNP/95-07 | hep-ph | null | We consider the physics of an extra $U(1)$ gauge boson $Z'$, which can mix
with $Z$ through intermediate fermion loops. The loop contribution due to the
heavy top quark significantly affects the low-energy observables, and for
$m_{Z'}>m_Z$, one can always adjust the shifts in these observables to be in
the right direction suggested by experiments, when we impose the anomaly
cancellation conditions for $Z'$.
| [
{
"created": "Wed, 26 Apr 1995 07:46:00 GMT",
"version": "v1"
},
{
"created": "Wed, 8 May 1996 13:22:46 GMT",
"version": "v2"
}
] | 2009-10-28 | [
[
"Kundu",
"Anirban",
""
]
] | We consider the physics of an extra $U(1)$ gauge boson $Z'$, which can mix with $Z$ through intermediate fermion loops. The loop contribution due to the heavy top quark significantly affects the low-energy observables, and for $m_{Z'}>m_Z$, one can always adjust the shifts in these observables to be in the right direction suggested by experiments, when we impose the anomaly cancellation conditions for $Z'$. |
2404.15112 | Paolo Torrielli | Luca Buonocore, Luca Rottoli, and Paolo Torrielli | Resummation of combined QCD-electroweak effects in Drell Yan lepton-pair
production | 23 pages, 13 figures | null | null | ZU-TH 21/24, CERN-TH-2024-045 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider neutral- and charged-current Drell Yan lepton-pair production at
hadron colliders, and include dominant classes of electroweak and mixed
QCD-electroweak corrections to all orders in perturbation theory. The accurate
description of these physical effects is vital for a precise determination of
fundamental Standard Model parameters, such as the $W$-boson mass and the
electroweak mixing angle, as well as for a solid assessment of the associated
theoretical uncertainties. Our state-of-the-art resummation reaches
next-to-leading-logarithmic accuracy in both the electroweak and the mixed
QCD-electroweak perturbative expansions, including constant terms at first
order beyond Born level in both couplings, i.e. at order $\alpha$ and $\alpha_s
\alpha$. These effects are incorporated on top of QCD predictions at
next-to-next-to-next-to-leading-logarithmic accuracy, which include constant
terms at third order in the strong coupling. Our results retain, for the first
time at this accuracy, full dependence on the kinematics of the final-state
leptons, thereby enabling a realistic comparison with experimental analyses at
the differential level in presence of fiducial cuts. We present a
phenomenological analysis of the impact of electroweak corrections in relevant
observables at the LHC. We find visible shape distortions in
resummation-dominated kinematical regions with respect to pure-QCD predictions,
highlighting the importance of a complete description, not limited to QCD, for
precision Drell Yan physics.
| [
{
"created": "Tue, 23 Apr 2024 15:05:43 GMT",
"version": "v1"
}
] | 2024-04-24 | [
[
"Buonocore",
"Luca",
""
],
[
"Rottoli",
"Luca",
""
],
[
"Torrielli",
"Paolo",
""
]
] | We consider neutral- and charged-current Drell Yan lepton-pair production at hadron colliders, and include dominant classes of electroweak and mixed QCD-electroweak corrections to all orders in perturbation theory. The accurate description of these physical effects is vital for a precise determination of fundamental Standard Model parameters, such as the $W$-boson mass and the electroweak mixing angle, as well as for a solid assessment of the associated theoretical uncertainties. Our state-of-the-art resummation reaches next-to-leading-logarithmic accuracy in both the electroweak and the mixed QCD-electroweak perturbative expansions, including constant terms at first order beyond Born level in both couplings, i.e. at order $\alpha$ and $\alpha_s \alpha$. These effects are incorporated on top of QCD predictions at next-to-next-to-next-to-leading-logarithmic accuracy, which include constant terms at third order in the strong coupling. Our results retain, for the first time at this accuracy, full dependence on the kinematics of the final-state leptons, thereby enabling a realistic comparison with experimental analyses at the differential level in presence of fiducial cuts. We present a phenomenological analysis of the impact of electroweak corrections in relevant observables at the LHC. We find visible shape distortions in resummation-dominated kinematical regions with respect to pure-QCD predictions, highlighting the importance of a complete description, not limited to QCD, for precision Drell Yan physics. |
hep-ph/9604227 | Sekretariat Phil. weg16 | Christof Wetterich | Integrating out Gluons in Flow Equations | 56 pages, Latex | Z.Phys. C72 (1996) 139-162 | 10.1007/s002880050232 | HD-THEP-95-47 | hep-ph | null | We present an exact nonperturbative flow equation for the average action for
quarks which incorporates the effects of gluon fluctuations. With suitable
truncations this allows one to compute effective multiquark interactions in
dependence on an infrared scale $k$. Our method amounts to integrating out the
gluons with momenta larger than $k$.
| [
{
"created": "Tue, 2 Apr 1996 10:14:57 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Wetterich",
"Christof",
""
]
] | We present an exact nonperturbative flow equation for the average action for quarks which incorporates the effects of gluon fluctuations. With suitable truncations this allows one to compute effective multiquark interactions in dependence on an infrared scale $k$. Our method amounts to integrating out the gluons with momenta larger than $k$. |
1702.07980 | Bo Feng | Bo Feng, De-fu Hou, Hui Liu, Hai-cang Ren, Ping-ping Wu, and Yan Wu | Chiral Magnetic Effect in a Lattice Model | 7 pages | Phys. Rev. D 95, 114023 (2017) | 10.1103/PhysRevD.95.114023 | null | hep-ph hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study analytically the one-loop contribution to the Chiral Magnetic
Effect(CME) using lattice regularization with a Wilson fermion field. In the
continuum limit, we find that the chiral magnetic current vanishes at nonzero
temperature but emerges at zero temperature consistent with that found by
Pauli-Villas regularization. For finite lattice size, however, the chiral
magnetic current is nonvanishing at nonzero temperature. But the numerical
vaule of the coefficient of CME current is very small compared with that
extracted from the full QCD simulation for the same lattice parameters. The
possibility of higher order corrections from QCD dynamics is also assessed.
| [
{
"created": "Sun, 26 Feb 2017 03:04:45 GMT",
"version": "v1"
}
] | 2017-07-05 | [
[
"Feng",
"Bo",
""
],
[
"Hou",
"De-fu",
""
],
[
"Liu",
"Hui",
""
],
[
"Ren",
"Hai-cang",
""
],
[
"Wu",
"Ping-ping",
""
],
[
"Wu",
"Yan",
""
]
] | We study analytically the one-loop contribution to the Chiral Magnetic Effect(CME) using lattice regularization with a Wilson fermion field. In the continuum limit, we find that the chiral magnetic current vanishes at nonzero temperature but emerges at zero temperature consistent with that found by Pauli-Villas regularization. For finite lattice size, however, the chiral magnetic current is nonvanishing at nonzero temperature. But the numerical vaule of the coefficient of CME current is very small compared with that extracted from the full QCD simulation for the same lattice parameters. The possibility of higher order corrections from QCD dynamics is also assessed. |
1101.3466 | Cyrille Marquet | Cyrille Marquet | Azimuthal angle and rapidity dependence of di-hadron correlations in QCD | 8 pages, 6 figures, Proceedings of the 4th International Conference
on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions
(HP2010), Eilat, Israel, October 10-15 2010 | null | 10.1016/j.nuclphysa.2011.02.033 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I discuss novel QCD phenomena recently observed in p+p, p+A and A+A
collisions, that result from the non-linear dynamics of small-x gluons. I focus
on di-hadron correlation measurements, as opposed to single-hadron observables
often too inclusive to distinguish possible new effects from established
mechanisms. Specifically, I discuss angular correlations of forward di-hadrons
in d+Au collisions and long-range rapidity correlations in high-multiplicity
p+p and Au+Au collisions.
| [
{
"created": "Tue, 18 Jan 2011 14:52:45 GMT",
"version": "v1"
}
] | 2015-05-27 | [
[
"Marquet",
"Cyrille",
""
]
] | I discuss novel QCD phenomena recently observed in p+p, p+A and A+A collisions, that result from the non-linear dynamics of small-x gluons. I focus on di-hadron correlation measurements, as opposed to single-hadron observables often too inclusive to distinguish possible new effects from established mechanisms. Specifically, I discuss angular correlations of forward di-hadrons in d+Au collisions and long-range rapidity correlations in high-multiplicity p+p and Au+Au collisions. |
hep-ph/0110344 | Jan Fischer | Irinel Caprini and Jan Fischer | Analytic continuation and perturbative expansions in QCD | 18 pages, latex, 5 figures in EPS format | Eur.Phys.J.C24:127-135,2002 | 10.1007/s100520100880 | null | hep-ph | null | Starting from the divergence pattern of perturbative quantum chromodynamics,
we propose a novel, non-power series replacing the standard expansion in powers
of the renormalized coupling constant $a$. The coefficients of the new
expansion are calculable at each finite order from the Feynman diagrams, while
the expansion functions, denoted as $W_n(a)$, are defined by analytic
continuation in the Borel complex plane. The infrared ambiguity of perturbation
theory is manifest in the prescription dependence of the $W_n(a)$. We prove
that the functions $W_n(a)$ have branch point and essential singularities at
the origin $a=0$ of the complex $a$-plane and their perturbative expansions in
powers of $a$ are divergent, while the expansion of the correlators in terms of
the $W_n(a)$ set is convergent under quite loose conditions
| [
{
"created": "Fri, 26 Oct 2001 07:42:31 GMT",
"version": "v1"
}
] | 2011-09-13 | [
[
"Caprini",
"Irinel",
""
],
[
"Fischer",
"Jan",
""
]
] | Starting from the divergence pattern of perturbative quantum chromodynamics, we propose a novel, non-power series replacing the standard expansion in powers of the renormalized coupling constant $a$. The coefficients of the new expansion are calculable at each finite order from the Feynman diagrams, while the expansion functions, denoted as $W_n(a)$, are defined by analytic continuation in the Borel complex plane. The infrared ambiguity of perturbation theory is manifest in the prescription dependence of the $W_n(a)$. We prove that the functions $W_n(a)$ have branch point and essential singularities at the origin $a=0$ of the complex $a$-plane and their perturbative expansions in powers of $a$ are divergent, while the expansion of the correlators in terms of the $W_n(a)$ set is convergent under quite loose conditions |
0801.3071 | Kazuhiro Tanaka | Hiroyuki Kawamura (1), Jiro Kodaira (2), Kazuhiro Tanaka (3) ((1)
RIKEN, (2) KEK, (3) Juntendo Univ.) | The OPE of the B-meson light-cone wavefunction for exclusive B decays:
radiative corrections and higher-dimensional operators | 6 pages, to appear in the proceedings of 8th International Symposium
on Radiative Corrections (RADCOR 2007), Florence, Italy, October 1-5;
corrected typos | PoSRADCOR2007:049,2007 | null | null | hep-ph | null | We discuss the B-meson light-cone wavefunction relevant for QCD factorization
approach for exclusive B-meson decays. We derive the operator product expansion
for the B-meson light-cone wavefunction, taking into account the local
composite operators of dimension less than 6 and calculating the radiative
corrections at order \alpha_s for the corresponding Wilson coefficients. The
result embodies peculiar UV and IR behaviors of the B-meson light-cone
wavefunction, the Sudakov-type double logarithmic effects and the mixing of the
multiparticle states with additional gluons inside the B meson. The former
effects are induced from the cusp singularity in the radiative corrections,
while the latter is manifested by the participation of the higher-dimensional
operators associated with the nonperturbative structure of the B meson.
| [
{
"created": "Sun, 20 Jan 2008 09:50:20 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Jan 2008 03:25:33 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Kawamura",
"Hiroyuki",
""
],
[
"Kodaira",
"Jiro",
""
],
[
"Tanaka",
"Kazuhiro",
""
]
] | We discuss the B-meson light-cone wavefunction relevant for QCD factorization approach for exclusive B-meson decays. We derive the operator product expansion for the B-meson light-cone wavefunction, taking into account the local composite operators of dimension less than 6 and calculating the radiative corrections at order \alpha_s for the corresponding Wilson coefficients. The result embodies peculiar UV and IR behaviors of the B-meson light-cone wavefunction, the Sudakov-type double logarithmic effects and the mixing of the multiparticle states with additional gluons inside the B meson. The former effects are induced from the cusp singularity in the radiative corrections, while the latter is manifested by the participation of the higher-dimensional operators associated with the nonperturbative structure of the B meson. |
2407.08523 | Kentaro Hayashi | Kentaro Hayashi, Yasuhiko Tsue | Modified dilepton production rate from charged pion-pair annihilation in
the inhomogeneous chiral condensed phase | 10 pages, 5 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the dilepton production rates from annihilation processes of
charged pion pairs with modified pion dispersion relations in the inhomogeneous
chiral condensed phase. We assume a dual chiral density wave as an
inhomogeneous chiral condensate, and obtain the dispersion relations of the
Nambu-Goldstone modes in the inhomogeneous chiral condensed phase. We use a low
energy effective Lagrangian based on the O(4) symmetry which is expanded by the
order parameter up to the sixth order. The obtained dispersion relations are
anisotropic and quadratic for the momentum. We evaluate the electron-positron
production rates by charged pion-pair annihilations as functions of an
invariant mass using the obtained dispersion relations. Basically, the
production rate in the inhomogeneous chiral condensed phase has a steeper
overall slope with respect to an invariant mass than that in the homogeneous
chiral condensed phase. Also, there may be a possibility that the production
rate diverges when the invariant mass is just twice the pion mass.
| [
{
"created": "Thu, 11 Jul 2024 14:10:33 GMT",
"version": "v1"
}
] | 2024-07-12 | [
[
"Hayashi",
"Kentaro",
""
],
[
"Tsue",
"Yasuhiko",
""
]
] | We investigate the dilepton production rates from annihilation processes of charged pion pairs with modified pion dispersion relations in the inhomogeneous chiral condensed phase. We assume a dual chiral density wave as an inhomogeneous chiral condensate, and obtain the dispersion relations of the Nambu-Goldstone modes in the inhomogeneous chiral condensed phase. We use a low energy effective Lagrangian based on the O(4) symmetry which is expanded by the order parameter up to the sixth order. The obtained dispersion relations are anisotropic and quadratic for the momentum. We evaluate the electron-positron production rates by charged pion-pair annihilations as functions of an invariant mass using the obtained dispersion relations. Basically, the production rate in the inhomogeneous chiral condensed phase has a steeper overall slope with respect to an invariant mass than that in the homogeneous chiral condensed phase. Also, there may be a possibility that the production rate diverges when the invariant mass is just twice the pion mass. |
2110.09988 | Pablo Mart\'inez-Mirav\'e | Pablo Mart\'inez-Mirav\'e | Cosmological radiation density with non-standard neutrino-electron
interactions | 5 pages, 2 figures. Based on arXiv:2105.08168. Proceedings for the
17th International Conference on Topics in Astroparticle and Underground
Physics | null | 10.1088/1742-6596/2156/1/012011 | null | hep-ph astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | Non-standard interactions (NSI) between neutrinos and electrons can
significantly modify the decoupling of neutrinos from the plasma. These
interactions have two effects on the overall picture: (i) they alter neutrino
oscillations though matter effects and (ii) they modify the scattering and
annihilation processes involving neutrinos and electrons and positrons. We
study the role of non-universal and flavour-changing NSI in the decoupling and
how they impact the determination of the effective number of neutrinos,
$N_{eff}$. We examine the degeneracies between NSI parameters and we compare
the expected sensitivity from future cosmological surveys with the current
limits from terrestrial experiments. We outline the complementarity between
both approaches.
| [
{
"created": "Tue, 19 Oct 2021 14:01:53 GMT",
"version": "v1"
}
] | 2022-03-02 | [
[
"Martínez-Miravé",
"Pablo",
""
]
] | Non-standard interactions (NSI) between neutrinos and electrons can significantly modify the decoupling of neutrinos from the plasma. These interactions have two effects on the overall picture: (i) they alter neutrino oscillations though matter effects and (ii) they modify the scattering and annihilation processes involving neutrinos and electrons and positrons. We study the role of non-universal and flavour-changing NSI in the decoupling and how they impact the determination of the effective number of neutrinos, $N_{eff}$. We examine the degeneracies between NSI parameters and we compare the expected sensitivity from future cosmological surveys with the current limits from terrestrial experiments. We outline the complementarity between both approaches. |
1610.04613 | Torsten Bringmann | Torsten Bringmann, Ahmad Galea, Andrzej Hryczuk and Christoph Weniger | Novel Spectral Features in MeV Gamma Rays from Dark Matter | 7 pages revtex4-1, 5 figures; minor updates in sensitivity figures
and discussion. Matches published version | Phys. Rev. D 95, 043002 (2017) | 10.1103/PhysRevD.95.043002 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Astrophysical searches for gamma rays are one of the main strategies to probe
the annihilation or decay of dark matter particles. We present a new class of
distinct sub-GeV spectral features that generically appear in kinematical
situations where the available center-of-mass energy in such processes is just
above threshold to produce excited meson states. Using a Fisher forecast with
realistic astrophysical backgrounds, we demonstrate that for upcoming
experiments like e-ASTROGAM and ComPair these signals can turn out to be the
smoking gun in the search for particle dark matter.
| [
{
"created": "Fri, 14 Oct 2016 20:00:00 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Feb 2017 21:42:44 GMT",
"version": "v2"
}
] | 2017-02-20 | [
[
"Bringmann",
"Torsten",
""
],
[
"Galea",
"Ahmad",
""
],
[
"Hryczuk",
"Andrzej",
""
],
[
"Weniger",
"Christoph",
""
]
] | Astrophysical searches for gamma rays are one of the main strategies to probe the annihilation or decay of dark matter particles. We present a new class of distinct sub-GeV spectral features that generically appear in kinematical situations where the available center-of-mass energy in such processes is just above threshold to produce excited meson states. Using a Fisher forecast with realistic astrophysical backgrounds, we demonstrate that for upcoming experiments like e-ASTROGAM and ComPair these signals can turn out to be the smoking gun in the search for particle dark matter. |
2311.18472 | Francesco Romeo | Sehar Ajmal, Jethro Gaglione, Alfredo Gurrola, Orlando Panella, Matteo
Presilla, Francesco Romeo, Hao Sun, She-Sheng Xue | Searching for exclusive leptoquarks with the Nambu-Jona-Lasinio
composite model at the LHC and HL-LHC | null | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We present a detailed study concerning a new physics scenario involving four
fermion operators of the Nambu-Jona-Lasinio type characterized by a
strong-coupling ultraviolet fixed point where composite particles are formed as
bound states of elementary fermions at the scale $\Lambda ={\cal
O}(\text{TeV})$. After implementing the model in the Universal FeynRules Output
format, we focus on the phenomenology of the scalar leptoquarks at the LHC and
the High-Luminosity option. Leptoquark particles have undergone extensive
scrutiny in the literature and experimental searches, primarily relying on pair
production and, more recently, incorporating single, t-channel, and
lepton-induced processes. This study marks, for the first time, the examination
of these production modes at varying jet multiplicities. Novel mechanisms
emerge, enhancing the total production cross-section, especially for
leptoquarks couplings to higher fermion generations. A global strategy is
devised to capture all final state particles produced in association with
leptoquarks or originating from their decay, which we termed ``exclusive'', in
an analogy to the nomenclature used in nuclear reactions. The assessment of the
significance in current and future LHC runs, focusing on the case of leptoquark
coupling to a muon - $\textit{c}$ quark pair, reveals superior sensitivity
compared to ongoing searches. Given this heightened discovery potential, we
advocate the incorporation of exclusive leptoquark searches in future
investigations at the LHC.
| [
{
"created": "Thu, 30 Nov 2023 11:28:33 GMT",
"version": "v1"
},
{
"created": "Fri, 15 Dec 2023 17:32:23 GMT",
"version": "v2"
},
{
"created": "Fri, 31 May 2024 16:44:18 GMT",
"version": "v3"
}
] | 2024-06-03 | [
[
"Ajmal",
"Sehar",
""
],
[
"Gaglione",
"Jethro",
""
],
[
"Gurrola",
"Alfredo",
""
],
[
"Panella",
"Orlando",
""
],
[
"Presilla",
"Matteo",
""
],
[
"Romeo",
"Francesco",
""
],
[
"Sun",
"Hao",
""
],
[
... | We present a detailed study concerning a new physics scenario involving four fermion operators of the Nambu-Jona-Lasinio type characterized by a strong-coupling ultraviolet fixed point where composite particles are formed as bound states of elementary fermions at the scale $\Lambda ={\cal O}(\text{TeV})$. After implementing the model in the Universal FeynRules Output format, we focus on the phenomenology of the scalar leptoquarks at the LHC and the High-Luminosity option. Leptoquark particles have undergone extensive scrutiny in the literature and experimental searches, primarily relying on pair production and, more recently, incorporating single, t-channel, and lepton-induced processes. This study marks, for the first time, the examination of these production modes at varying jet multiplicities. Novel mechanisms emerge, enhancing the total production cross-section, especially for leptoquarks couplings to higher fermion generations. A global strategy is devised to capture all final state particles produced in association with leptoquarks or originating from their decay, which we termed ``exclusive'', in an analogy to the nomenclature used in nuclear reactions. The assessment of the significance in current and future LHC runs, focusing on the case of leptoquark coupling to a muon - $\textit{c}$ quark pair, reveals superior sensitivity compared to ongoing searches. Given this heightened discovery potential, we advocate the incorporation of exclusive leptoquark searches in future investigations at the LHC. |
hep-ph/0111387 | Christian Bauer | Christian W. Bauer, Zoltan Ligeti and Michael Luke | Precision determination of Vub | 5 pages, Talk presented by C. W. Bauer at the International
Europhysics Conference on High Energy Physics (HEP2001), Budapest, Hungary,
July 12-18 2001 | null | null | UCSD-PTH 01-22 | hep-ph | null | We review how to determine |Vub| from inclusive semileptonic B decay using
combined cuts on the leptonic and hadronic invariant masses to eliminate the b
-> c background. This leads to a determination of |Vub| with theoretical
uncertainty at the 5 -10% level.
| [
{
"created": "Wed, 28 Nov 2001 22:34:22 GMT",
"version": "v1"
},
{
"created": "Tue, 18 Dec 2001 14:40:17 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Bauer",
"Christian W.",
""
],
[
"Ligeti",
"Zoltan",
""
],
[
"Luke",
"Michael",
""
]
] | We review how to determine |Vub| from inclusive semileptonic B decay using combined cuts on the leptonic and hadronic invariant masses to eliminate the b -> c background. This leads to a determination of |Vub| with theoretical uncertainty at the 5 -10% level. |
hep-ph/0203193 | U. Meissner | Matthias Frink, Bastian Kubis, Ulf-G. Mei{\ss}ner | Analysis of the pion-kaon sigma-term and related topics | 25 pp, 3 figs | Eur.Phys.J.C25:259-276,2002 | 10.1007/s10052-002-0975-1 | FZJ-IKP(TH)-2002-07 | hep-ph | null | We calculate the one-loop contributions to the difference \Delta_{\pi K}
between the isoscalar on-shell pion-kaon scattering amplitude at the
Cheng-Dashen point and the scalar form factor \Gamma_K (2M_\pi^2) in the
framework of three flavor chiral perturbation theory. These corrections turn
out to be small. This is further sharpened by treating the kaons as heavy
fields (two flavor chiral perturbation theory). We also analyze the two-loop
corrections to the kaon scalar form factor based on a dispersive technique. We
find that these corrections are smaller than in the comparable case of the
scalar form factor of the pion. This is related to the weaker final state
interactions in the pion-kaon channel.
| [
{
"created": "Wed, 20 Mar 2002 09:26:57 GMT",
"version": "v1"
}
] | 2009-01-07 | [
[
"Frink",
"Matthias",
""
],
[
"Kubis",
"Bastian",
""
],
[
"Meißner",
"Ulf-G.",
""
]
] | We calculate the one-loop contributions to the difference \Delta_{\pi K} between the isoscalar on-shell pion-kaon scattering amplitude at the Cheng-Dashen point and the scalar form factor \Gamma_K (2M_\pi^2) in the framework of three flavor chiral perturbation theory. These corrections turn out to be small. This is further sharpened by treating the kaons as heavy fields (two flavor chiral perturbation theory). We also analyze the two-loop corrections to the kaon scalar form factor based on a dispersive technique. We find that these corrections are smaller than in the comparable case of the scalar form factor of the pion. This is related to the weaker final state interactions in the pion-kaon channel. |
0708.1474 | Johannes Bluemlein | Johannes Bl\"umlein | The Status of the Polarized Parton Densities | Proceedings of 15th International Workshop on Deep-Inelastic
Scattering and Related Subjects (DIS2007), Munich, Germany, 16-20 Apr 2007, 6
pages | null | null | DESY 07-114, SFB/CPP-07-48 | hep-ph astro-ph hep-ex | null | A survey is given on the present knowledge of the polarized parton
distribution functions. We give an outlook for further developments desired
both on the theoretical as well on the experimental side to complete the
understanding of the spin--structure of nucleons in the future.
| [
{
"created": "Fri, 10 Aug 2007 15:30:40 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Aug 2007 06:57:28 GMT",
"version": "v2"
}
] | 2007-08-13 | [
[
"Blümlein",
"Johannes",
""
]
] | A survey is given on the present knowledge of the polarized parton distribution functions. We give an outlook for further developments desired both on the theoretical as well on the experimental side to complete the understanding of the spin--structure of nucleons in the future. |
0904.4750 | Yue Chongxing | Chong-Xing Yue, Yong-Zhi Wang, Wei Lui, Wei Ma | Pair production of the T-odd leptons at the LHC | 12 pages, 2 figures | Europhys.Lett.86:31002,2009 | 10.1209/0295-5075/86/31002 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The T-odd leptons predicted by the littlest $Higgs$ model with T-parity can
be pair produced via the subprocesses $gg\to \ell^{+}_{H}\ell^{-}_{H}$,
$q\bar{q}\to \ell^{+}_{H}\ell^{-}_{H}$, $\gamma\gamma\to
\ell^{+}_{H}\ell^{-}_{H}$ and $ VV \to \ell^{+}_{H}\ell^{-}_{H}$ ($V$=$W$ or
$Z$) at the $CERN$ Large Hadron Collider $(LHC)$. We estimate the hadronic
production cross sections for all of these processes and give a simply
phenomenology analysis. We find that the cross sections for most of the above
processes are very small. However, the value of the cross section for the
$Drell-Yan$ process $q\bar{q}\to \ell^{+}_{H}\ell^{-}_{H}$ can reach $270fb$.
| [
{
"created": "Thu, 30 Apr 2009 06:44:52 GMT",
"version": "v1"
}
] | 2009-11-19 | [
[
"Yue",
"Chong-Xing",
""
],
[
"Wang",
"Yong-Zhi",
""
],
[
"Lui",
"Wei",
""
],
[
"Ma",
"Wei",
""
]
] | The T-odd leptons predicted by the littlest $Higgs$ model with T-parity can be pair produced via the subprocesses $gg\to \ell^{+}_{H}\ell^{-}_{H}$, $q\bar{q}\to \ell^{+}_{H}\ell^{-}_{H}$, $\gamma\gamma\to \ell^{+}_{H}\ell^{-}_{H}$ and $ VV \to \ell^{+}_{H}\ell^{-}_{H}$ ($V$=$W$ or $Z$) at the $CERN$ Large Hadron Collider $(LHC)$. We estimate the hadronic production cross sections for all of these processes and give a simply phenomenology analysis. We find that the cross sections for most of the above processes are very small. However, the value of the cross section for the $Drell-Yan$ process $q\bar{q}\to \ell^{+}_{H}\ell^{-}_{H}$ can reach $270fb$. |
1805.00286 | Larbi Rahili | M. Chabab, M. C. Peyran\`ere and L. Rahili | Probing the Higgs sector of $Y=0$ Higgs Triplet Model at LHC | 33 pages, 12 figures, 1 table, references added, version to be
published in Eur. Phys. J. C | null | 10.1140/epjc/s10052-018-6339-2 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we investigate the Higgs Triplet Model with hypercharge
$Y_{\Delta}=0$ (HTM0), an extension of the Standard model, caracterised by a
more involved scalar spectrum consisting of two CP even Higgs $h^0, H^0$ and
two charged Higgs bosons $H^\pm$. We first show that the parameter space of
HTM0, usually delimited by combined constraints originating from unitarity and
BFB as well as experimental limits from LEP and LHC, is severely reduced when
the modified Veltman conditions at one loop are also imposed. Then, we perform
an rigorous analysis of Higgs decays either when $h^0$ is the SM-like or when
the heaviest neutral Higgs $H^0$ is identified to the observed $125$ GeV Higgs
boson at LHC. In these scenarios, we perform an extensive parameter scan, in
the lower part of the scalar mass spectrum, with a particular focus on the
Higgs to Higgs decay modes $H^0 \to h^0h^0, H^\pm\,H^\mp$ leading predominantly
to invisible Higgs decays. Finally, we also study the scenario where $h^0, H^0$
are mass degenerate. We thus find that consistency with LHC signal strengths
favours a light charged Higgs with a mass about $176\sim178$ GeV.
Our analysis shows that the diphoton Higgs decay mode and $H \to Z \gamma$
are not always positively correlated as claimed in a previous study.
Anti-correlation is rather seen in the scenario where $h$ is SM like, while
correlation is sensitive to the sign of the potential parameter $\lambda$ when
$H$ is identified to $125$ GeV Higgs.
| [
{
"created": "Tue, 1 May 2018 12:15:17 GMT",
"version": "v1"
},
{
"created": "Fri, 4 May 2018 23:27:17 GMT",
"version": "v2"
},
{
"created": "Tue, 16 Oct 2018 20:20:39 GMT",
"version": "v3"
}
] | 2018-11-14 | [
[
"Chabab",
"M.",
""
],
[
"Peyranère",
"M. C.",
""
],
[
"Rahili",
"L.",
""
]
] | In this paper, we investigate the Higgs Triplet Model with hypercharge $Y_{\Delta}=0$ (HTM0), an extension of the Standard model, caracterised by a more involved scalar spectrum consisting of two CP even Higgs $h^0, H^0$ and two charged Higgs bosons $H^\pm$. We first show that the parameter space of HTM0, usually delimited by combined constraints originating from unitarity and BFB as well as experimental limits from LEP and LHC, is severely reduced when the modified Veltman conditions at one loop are also imposed. Then, we perform an rigorous analysis of Higgs decays either when $h^0$ is the SM-like or when the heaviest neutral Higgs $H^0$ is identified to the observed $125$ GeV Higgs boson at LHC. In these scenarios, we perform an extensive parameter scan, in the lower part of the scalar mass spectrum, with a particular focus on the Higgs to Higgs decay modes $H^0 \to h^0h^0, H^\pm\,H^\mp$ leading predominantly to invisible Higgs decays. Finally, we also study the scenario where $h^0, H^0$ are mass degenerate. We thus find that consistency with LHC signal strengths favours a light charged Higgs with a mass about $176\sim178$ GeV. Our analysis shows that the diphoton Higgs decay mode and $H \to Z \gamma$ are not always positively correlated as claimed in a previous study. Anti-correlation is rather seen in the scenario where $h$ is SM like, while correlation is sensitive to the sign of the potential parameter $\lambda$ when $H$ is identified to $125$ GeV Higgs. |
hep-ph/9903489 | Andreas Freund | Andreas Freund | Proof of factorization for electroproduction of multiple mesons and
exclusive $\gamma^* \gamma$ production of multiple hadrons | 16 pages, 5 figures, uses revtex, final version. to be published in
Phys. Rev. D | Phys.Rev. D61 (2000) 074010 | 10.1103/PhysRevD.61.074010 | null | hep-ph | null | In the following, we will present a generalization of the proof of
factorization for electroproduction of vector mesons to the production of
several mesons such as $\pi^+\pi^-$ and a proof of factorization for exclusive
$\gamma^* \gamma$ production of several hadrons for example $p \bar p$ or
$\pi^+\pi^-$ to all orders in perturbation theory up to power suppressed terms.
| [
{
"created": "Thu, 25 Mar 1999 11:10:24 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Apr 1999 08:45:34 GMT",
"version": "v2"
},
{
"created": "Fri, 26 Nov 1999 16:34:48 GMT",
"version": "v3"
}
] | 2009-10-31 | [
[
"Freund",
"Andreas",
""
]
] | In the following, we will present a generalization of the proof of factorization for electroproduction of vector mesons to the production of several mesons such as $\pi^+\pi^-$ and a proof of factorization for exclusive $\gamma^* \gamma$ production of several hadrons for example $p \bar p$ or $\pi^+\pi^-$ to all orders in perturbation theory up to power suppressed terms. |
2311.09166 | Matthew Low | Kun Cheng, Tao Han, Matthew Low | Optimizing Fictitious States for Bell Inequality Violation in Bipartite
Qubit Systems | v2: 6 pages, 1 figure, updated to journal version | Phys.Rev.D 109 (2024) 11, 116005 | 10.1103/PhysRevD.109.116005 | null | hep-ph quant-ph | http://creativecommons.org/licenses/by/4.0/ | There is a significant interest in testing quantum entanglement and Bell
inequality violation in high-energy experiments. Since the analyses in
high-energy experiments are performed with events statistically averaged over
phase space, the states used to determine observables depend on the choice of
coordinates through an event-dependent basis and are thus not genuine quantum
states, but rather "fictitious states." We prove that if Bell inequality
violation is observed with a fictitious state, then it implies the same for a
quantum sub-state. We further show analytically that the basis which
diagonalizes the spin-spin correlations is optimal for constructing fictitious
states, and for maximizing the violation of Bell's inequality.
| [
{
"created": "Wed, 15 Nov 2023 18:05:44 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Jun 2024 11:26:21 GMT",
"version": "v2"
}
] | 2024-06-11 | [
[
"Cheng",
"Kun",
""
],
[
"Han",
"Tao",
""
],
[
"Low",
"Matthew",
""
]
] | There is a significant interest in testing quantum entanglement and Bell inequality violation in high-energy experiments. Since the analyses in high-energy experiments are performed with events statistically averaged over phase space, the states used to determine observables depend on the choice of coordinates through an event-dependent basis and are thus not genuine quantum states, but rather "fictitious states." We prove that if Bell inequality violation is observed with a fictitious state, then it implies the same for a quantum sub-state. We further show analytically that the basis which diagonalizes the spin-spin correlations is optimal for constructing fictitious states, and for maximizing the violation of Bell's inequality. |
hep-ph/0606109 | Jacques Soffer | Jacques Soffer | New developments in the statistical approach of parton distributions | 10 pages, 12 figures. Invited talk presented at the " Corfu Summer
Institute on EPP,CORFU2005, Corfu, Greece, September 4-26, 2005. To be
published in Journal of Physics, Conference Series (2006) | null | 10.1088/1742-6596/53/1/029 | CPT-2006/P.012 | hep-ph | null | We recall how parton distributions are constructed in a statistical physical
picture of the nucleon. The chiral properties of QCD lead to strong relations
between quarks and antiquarks distributions and the importance of the Pauli
exclusion principle is also emphasized. A global next-to-leading order QCD
analysis of unpolarized and polarized deep-inelastic scattering data allows to
determine a small number of free parameters. Some predictions are compared to
recent experimental results and we discuss the prospects of this physical
framework.
| [
{
"created": "Fri, 9 Jun 2006 15:44:13 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Soffer",
"Jacques",
""
]
] | We recall how parton distributions are constructed in a statistical physical picture of the nucleon. The chiral properties of QCD lead to strong relations between quarks and antiquarks distributions and the importance of the Pauli exclusion principle is also emphasized. A global next-to-leading order QCD analysis of unpolarized and polarized deep-inelastic scattering data allows to determine a small number of free parameters. Some predictions are compared to recent experimental results and we discuss the prospects of this physical framework. |
hep-ph/0109005 | B. L. G. Bakker | B.L.G. Bakker and C.-R. Ji | Frame Dependence of Spin-One Angular Conditions in Light Front Dynamics | 29 pages RevTeX. submitted to Phys. Rev. D | Phys.Rev. D65 (2002) 073002 | 10.1103/PhysRevD.65.073002 | null | hep-ph | null | We elaborate the frame dependence of the angular conditions for spin-1 form
factors. An extra angular condition is found in addition to the usual angular
condition relating the four helicity amplitudes. Investigating the
frame-dependence of the angular conditions, we find that the extra angular
condition is in general as complicated as the usual one, although it becomes
very simple in the $q^+ = 0$ frame involving only two helicity amplitudes. It
is confirmed that the angular conditions are identical in frames that are
connected by kinematical transformations. The high $Q^2$ behaviors of the
physical form factors and the limiting behaviors in special reference frames
are also discussed.
| [
{
"created": "Sun, 2 Sep 2001 07:51:54 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Bakker",
"B. L. G.",
""
],
[
"Ji",
"C. -R.",
""
]
] | We elaborate the frame dependence of the angular conditions for spin-1 form factors. An extra angular condition is found in addition to the usual angular condition relating the four helicity amplitudes. Investigating the frame-dependence of the angular conditions, we find that the extra angular condition is in general as complicated as the usual one, although it becomes very simple in the $q^+ = 0$ frame involving only two helicity amplitudes. It is confirmed that the angular conditions are identical in frames that are connected by kinematical transformations. The high $Q^2$ behaviors of the physical form factors and the limiting behaviors in special reference frames are also discussed. |
hep-ph/0512154 | Kyle S. Cranmer | Kyle S. Cranmer | Potential for Higgs Physics at the LHC and Super-LHC | Invited talk at 2005 International Linear Collider Physics and
Detector Workshop and Second ILC Accelerator Workshop, Snowmass,
CO(Snowmass05) 3 pages, 0 figures. PSN ALCPG0602 | null | null | null | hep-ph | null | The expected sensitivity of the LHC experiments to the discovery of the Higgs
boson and the measurement of its properties is presented in the context of both
the standard model and the its minimal supersymmetric extension. Prospects for
a luminosity-upgraded ``Super-LHC'' are also presented.
| [
{
"created": "Mon, 12 Dec 2005 20:37:39 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Cranmer",
"Kyle S.",
""
]
] | The expected sensitivity of the LHC experiments to the discovery of the Higgs boson and the measurement of its properties is presented in the context of both the standard model and the its minimal supersymmetric extension. Prospects for a luminosity-upgraded ``Super-LHC'' are also presented. |
1304.2113 | Raghunath Sahoo | Raghunath Sahoo and Aditya Nath Mishra (Indian Institute of Technology
Indore, India) | Transverse energy and charged particle production in heavy-ion
collisions: From RHIC to LHC | 19 pages, 7 figures | International Journal of Modern Physics E, Vol. 23, No. 4 (2014)
1450024 (19 pages) | 10.1142/S0218301314500244 | null | hep-ph hep-ex nucl-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the charged particle and transverse energy production mechanism from
AGS, SPS, RHIC to LHC energies in the framework of nucleon and quark
participants. At RHIC and LHC energies, the number of nucleons-normalized
charged particle and transverse energy density in pseudorapidity, which shows a
monotonic rise with centrality, turns out to be an almost centrality
independent scaling behaviour when normalized to the number of participant
quarks. A universal function which is a combination of logarithmic and
power-law, describes well the charged particle and transverse energy production
both at nucleon and quark participant level for the whole range of collision
energies. Energy dependent production mechanisms are discussed both for
nucleonic and partonic level. Predictions are made for the pseudorapidity
densities of transverse energy, charged particle multiplicity and their ratio
(the barometric observable, $\frac{dE_{\rm{T}}/d\eta}{dN_{\rm{ch}}/d\eta}
~\equiv \frac{E_{\rm{T}}}{N_{\rm{ch}}}$) at mid-rapidity for Pb+Pb collisions
at $\sqrt{s_{\rm{NN}}}=5.5$ TeV. A comparison with models based on gluon
saturation and statistical hadron gas is made for the energy dependence of
$\frac{E_{\rm{T}}}{N_{\rm{ch}}}$.
| [
{
"created": "Mon, 8 Apr 2013 06:38:24 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Aug 2013 11:26:50 GMT",
"version": "v2"
},
{
"created": "Wed, 30 Apr 2014 11:10:43 GMT",
"version": "v3"
}
] | 2014-05-01 | [
[
"Sahoo",
"Raghunath",
"",
"Indian Institute of Technology\n Indore, India"
],
[
"Mishra",
"Aditya Nath",
"",
"Indian Institute of Technology\n Indore, India"
]
] | We study the charged particle and transverse energy production mechanism from AGS, SPS, RHIC to LHC energies in the framework of nucleon and quark participants. At RHIC and LHC energies, the number of nucleons-normalized charged particle and transverse energy density in pseudorapidity, which shows a monotonic rise with centrality, turns out to be an almost centrality independent scaling behaviour when normalized to the number of participant quarks. A universal function which is a combination of logarithmic and power-law, describes well the charged particle and transverse energy production both at nucleon and quark participant level for the whole range of collision energies. Energy dependent production mechanisms are discussed both for nucleonic and partonic level. Predictions are made for the pseudorapidity densities of transverse energy, charged particle multiplicity and their ratio (the barometric observable, $\frac{dE_{\rm{T}}/d\eta}{dN_{\rm{ch}}/d\eta} ~\equiv \frac{E_{\rm{T}}}{N_{\rm{ch}}}$) at mid-rapidity for Pb+Pb collisions at $\sqrt{s_{\rm{NN}}}=5.5$ TeV. A comparison with models based on gluon saturation and statistical hadron gas is made for the energy dependence of $\frac{E_{\rm{T}}}{N_{\rm{ch}}}$. |
hep-ph/0604071 | Omar Benhar | Omar Benhar, Davide Meloni | Estimates of the uncertainties associated with models of the nucleon
structure functions in the $\Delta$ production region | Accepted for publication in Physical Review Letters | Phys.Rev.Lett.97:192301,2006 | 10.1103/PhysRevLett.97.192301 | null | hep-ph | null | Theoretical studies of the inclusive electron-nucleus cross section at beam
energies up to few GeV show that, while the region of the quasi-elastic peak is
understood at quantitative level, the data in the $\Delta$ production region
are sizably underestimated. We analize the uncertainty associated with the
description of the nucleon structure functions $W_1$ and $W_2$ and its impact
on the nuclear cross section. The results of our study suggest that the failure
to reproduce the data is to be mostly ascribed to the poor knowledge of the
neutron structure functions at low $Q^2$.
| [
{
"created": "Fri, 7 Apr 2006 11:04:03 GMT",
"version": "v1"
},
{
"created": "Fri, 6 Oct 2006 07:01:26 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Benhar",
"Omar",
""
],
[
"Meloni",
"Davide",
""
]
] | Theoretical studies of the inclusive electron-nucleus cross section at beam energies up to few GeV show that, while the region of the quasi-elastic peak is understood at quantitative level, the data in the $\Delta$ production region are sizably underestimated. We analize the uncertainty associated with the description of the nucleon structure functions $W_1$ and $W_2$ and its impact on the nuclear cross section. The results of our study suggest that the failure to reproduce the data is to be mostly ascribed to the poor knowledge of the neutron structure functions at low $Q^2$. |
2112.12568 | Johannes Roth | Johannes V. Roth, Dominik Schweitzer, Leon J. Sieke, and Lorenz von
Smekal | Real-time methods for spectral functions | 35 pages, 8 figures, revised version accepted for publication in PRD | null | 10.1103/PhysRevD.105.116017 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we develop and compare different real-time methods to calculate
spectral functions. These are classical-statistical simulations, the Gaussian
state approximation (GSA), and the functional renormalization group (FRG)
formulated on the Keldysh closed-time path. Our test-bed system is the quartic
anharmonic oscillator, a single self-interacting bosonic degree of freedom,
coupled to an external heat bath providing dissipation analogous to the
Caldeira-Leggett model. As our benchmark we use the spectral function from
exact diagonalization with constant Ohmic damping. To extend the GSA for the
open system, we solve the corresponding Heisenberg-Langevin equations in the
Gaussian approximation. For the real-time FRG, we introduce a novel general
prescription to construct causal regulators based on introducing
scale-dependent fictitious heat baths. Our results explicitly demonstrate how
the discrete transition lines of the quantum system gradually build up the
broad continuous structures in the classical spectral function as temperature
increases. At sufficiently high temperatures, classical, GSA and
exact-diagonalization results all coincide. The real-time FRG is able to
reproduce the effective thermal mass, but overestimates broadening and only
qualitatively describes higher excitations, at the present order of our
combined vertex and loop expansion. As temperature is lowered, the GSA follows
the ensemble average of the exact solution better than the classical spectral
function. In the low-temperature strong-coupling regime, the qualitative
features of the exact result are best captured by our real-time FRG
calculation, with quantitative improvements to be expected at higher truncation
orders.
| [
{
"created": "Thu, 23 Dec 2021 14:29:27 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Jan 2022 14:29:23 GMT",
"version": "v2"
},
{
"created": "Tue, 31 May 2022 15:31:18 GMT",
"version": "v3"
}
] | 2022-06-23 | [
[
"Roth",
"Johannes V.",
""
],
[
"Schweitzer",
"Dominik",
""
],
[
"Sieke",
"Leon J.",
""
],
[
"von Smekal",
"Lorenz",
""
]
] | In this paper we develop and compare different real-time methods to calculate spectral functions. These are classical-statistical simulations, the Gaussian state approximation (GSA), and the functional renormalization group (FRG) formulated on the Keldysh closed-time path. Our test-bed system is the quartic anharmonic oscillator, a single self-interacting bosonic degree of freedom, coupled to an external heat bath providing dissipation analogous to the Caldeira-Leggett model. As our benchmark we use the spectral function from exact diagonalization with constant Ohmic damping. To extend the GSA for the open system, we solve the corresponding Heisenberg-Langevin equations in the Gaussian approximation. For the real-time FRG, we introduce a novel general prescription to construct causal regulators based on introducing scale-dependent fictitious heat baths. Our results explicitly demonstrate how the discrete transition lines of the quantum system gradually build up the broad continuous structures in the classical spectral function as temperature increases. At sufficiently high temperatures, classical, GSA and exact-diagonalization results all coincide. The real-time FRG is able to reproduce the effective thermal mass, but overestimates broadening and only qualitatively describes higher excitations, at the present order of our combined vertex and loop expansion. As temperature is lowered, the GSA follows the ensemble average of the exact solution better than the classical spectral function. In the low-temperature strong-coupling regime, the qualitative features of the exact result are best captured by our real-time FRG calculation, with quantitative improvements to be expected at higher truncation orders. |
hep-ph/9912306 | Peter Arnold | Peter Arnold and Laurence G. Yaffe | High temperature color conductivity at next-to-leading log order | 47 pages, 6+2 figures | Phys.Rev.D62:125014,2000 | 10.1103/PhysRevD.62.125014 | UW/PT 99-24 | hep-ph | null | The non-Abelian analog of electrical conductivity at high temperature has
previously been known only at leading logarithmic order: that is, neglecting
effects suppressed only by an inverse logarithm of the gauge coupling. We
calculate the first sub-leading correction. This has immediate application to
improving, to next-to-leading log order, both effective theories of
non-perturbative color dynamics, and calculations of the hot electroweak baryon
number violation rate.
| [
{
"created": "Fri, 10 Dec 1999 22:38:25 GMT",
"version": "v1"
}
] | 2010-02-16 | [
[
"Arnold",
"Peter",
""
],
[
"Yaffe",
"Laurence G.",
""
]
] | The non-Abelian analog of electrical conductivity at high temperature has previously been known only at leading logarithmic order: that is, neglecting effects suppressed only by an inverse logarithm of the gauge coupling. We calculate the first sub-leading correction. This has immediate application to improving, to next-to-leading log order, both effective theories of non-perturbative color dynamics, and calculations of the hot electroweak baryon number violation rate. |
1703.02122 | Marcin Badziak | Marcin Badziak and Keisuke Harigaya | Supersymmetric D-term Twin Higgs | 27 pages, 5 figures; v2: appendix extended, matches version published
in JHEP | null | 10.1007/JHEP06(2017)065 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a new type of supersymmetric Twin Higgs model where the SU(4)
invariant quartic term is provided by a D-term potential of a new U(1) gauge
symmetry. In the model the 125 GeV Higgs mass can be obtained for stop masses
below 1 TeV, and a tuning required to obtain the correct electroweak scale can
be as low as 20 %. A stop mass of about 2 TeV is also possible with tuning of
order O(10) %.
| [
{
"created": "Mon, 6 Mar 2017 21:46:51 GMT",
"version": "v1"
},
{
"created": "Wed, 1 Nov 2017 04:50:24 GMT",
"version": "v2"
}
] | 2017-11-02 | [
[
"Badziak",
"Marcin",
""
],
[
"Harigaya",
"Keisuke",
""
]
] | We propose a new type of supersymmetric Twin Higgs model where the SU(4) invariant quartic term is provided by a D-term potential of a new U(1) gauge symmetry. In the model the 125 GeV Higgs mass can be obtained for stop masses below 1 TeV, and a tuning required to obtain the correct electroweak scale can be as low as 20 %. A stop mass of about 2 TeV is also possible with tuning of order O(10) %. |
hep-ph/0504179 | Celso de Camargo Barros Barros | Celso de Camargo Barros Jr | Quark confinement and curved spaces | null | Eur.Phys.J.C45:421-425,2006 | 10.1140/epjc/s2005-02431-6 | null | hep-ph | null | In this work it will be shown how quark confinement appears when wave
equations derived in curved spaces are considered. First, the equations and
their solutions for Coulomb-like potentials will be presented, and then, how
this theory leads to quark confinement. A comparison between different models
of confinement will be also made.
| [
{
"created": "Wed, 20 Apr 2005 18:06:45 GMT",
"version": "v1"
}
] | 2009-01-07 | [
[
"Barros",
"Celso de Camargo",
"Jr"
]
] | In this work it will be shown how quark confinement appears when wave equations derived in curved spaces are considered. First, the equations and their solutions for Coulomb-like potentials will be presented, and then, how this theory leads to quark confinement. A comparison between different models of confinement will be also made. |
1304.4087 | Miguel Angel Escobedo Espinosa | Miguel Angel Escobedo, Floriana Giannuzzi, Massimo Mannarelli and Joan
Soto | Heavy Quarkonium moving in a Quark-Gluon Plasma | Published version, title changed and improved bibliography, 21 pages.
8 figures | Physical Review D 87, 114005 (2013) | 10.1103/PhysRevD.87.114005 | UB-ECM-PF-13/88, ICCUB-13-064, BARI-TH/13-674, TUM-EFT35/12 | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | By means of effective field theory techniques, we study the modifications of
some properties of weakly coupled heavy quarkonium states propagating through a
quark-gluon plasma at temperatures much smaller than the heavy quark mass, m_Q.
Two different cases are considered, corresponding to two different hierarchies
between the typical size of the bound state, r, the binding energy, E, the
temperature, T, and the screening mass, m_D. The first case corresponds to the
hierarchy m_Q >> 1/r >> T >> E >> m_D, relevant for moderate temperatures, and
the second one to the hierarchy m_Q >> T >> 1/r, m_D >> E, relevant for
studying the dissociation mechanism. In the first case we determine the
perturbative correction to the binding energy and to the decay width of states
with arbitrary angular momentum, finding that the width is a decreasing
function of the velocity. A different behavior characterizes the second
kinematical case, being the width of s-wave states a non-monotonic function of
the velocity, increasing at moderate velocities and decreasing in the
ultra-relativistic limit. We obtain a simple analytical expression of the decay
width for T >> 1/r >> m_D >> E at moderate velocities, and we derive the s-wave
spectral function for the more general case T >> 1/r, m_D >> E. A brief
discussion of the possible experimental signatures as well as a comparison with
the relevant lattice data are also presented.
| [
{
"created": "Mon, 15 Apr 2013 13:15:17 GMT",
"version": "v1"
},
{
"created": "Thu, 27 Jun 2013 07:46:04 GMT",
"version": "v2"
}
] | 2013-06-28 | [
[
"Escobedo",
"Miguel Angel",
""
],
[
"Giannuzzi",
"Floriana",
""
],
[
"Mannarelli",
"Massimo",
""
],
[
"Soto",
"Joan",
""
]
] | By means of effective field theory techniques, we study the modifications of some properties of weakly coupled heavy quarkonium states propagating through a quark-gluon plasma at temperatures much smaller than the heavy quark mass, m_Q. Two different cases are considered, corresponding to two different hierarchies between the typical size of the bound state, r, the binding energy, E, the temperature, T, and the screening mass, m_D. The first case corresponds to the hierarchy m_Q >> 1/r >> T >> E >> m_D, relevant for moderate temperatures, and the second one to the hierarchy m_Q >> T >> 1/r, m_D >> E, relevant for studying the dissociation mechanism. In the first case we determine the perturbative correction to the binding energy and to the decay width of states with arbitrary angular momentum, finding that the width is a decreasing function of the velocity. A different behavior characterizes the second kinematical case, being the width of s-wave states a non-monotonic function of the velocity, increasing at moderate velocities and decreasing in the ultra-relativistic limit. We obtain a simple analytical expression of the decay width for T >> 1/r >> m_D >> E at moderate velocities, and we derive the s-wave spectral function for the more general case T >> 1/r, m_D >> E. A brief discussion of the possible experimental signatures as well as a comparison with the relevant lattice data are also presented. |
1410.5908 | Jong-Chul Park | Jong-Chul Park, Seong Chan Park | Superheavy Dark Matter in Light of Dark Radiation | 7 pages, 2 figures; published in JKPS | J. Korean Phys. Soc. 65 (2014) No. 6, 805 | 10.3938/jkps.65.805 | null | hep-ph astro-ph.CO astro-ph.HE hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Superheavy dark matter can satisfy the observed dark matter abundance if the
stability condition is fulfilled. Here, we propose a new Abelian gauge symmetry
${\rm U(1)}_H$ for the stability of superheavy dark matter as the
electromagnetic gauge symmetry to the electron. The new gauge boson associated
with ${\rm U(1)}_H$ contributes to the effective number of relativistic degrees
of freedom in the universe as dark radiation, which has been recently measured
by several experiments, e.g., PLANCK. We calculate the contribution to dark
radiation from the decay of a scalar particle via the superheavy dark matter in
the loop. Interestingly enough, this scenario will be probed by a future LHC
run in the invisible decay signatures of the Higgs boson.
| [
{
"created": "Wed, 22 Oct 2014 03:45:46 GMT",
"version": "v1"
}
] | 2015-06-23 | [
[
"Park",
"Jong-Chul",
""
],
[
"Park",
"Seong Chan",
""
]
] | Superheavy dark matter can satisfy the observed dark matter abundance if the stability condition is fulfilled. Here, we propose a new Abelian gauge symmetry ${\rm U(1)}_H$ for the stability of superheavy dark matter as the electromagnetic gauge symmetry to the electron. The new gauge boson associated with ${\rm U(1)}_H$ contributes to the effective number of relativistic degrees of freedom in the universe as dark radiation, which has been recently measured by several experiments, e.g., PLANCK. We calculate the contribution to dark radiation from the decay of a scalar particle via the superheavy dark matter in the loop. Interestingly enough, this scenario will be probed by a future LHC run in the invisible decay signatures of the Higgs boson. |
hep-ph/9809515 | Kingman Cheung | Kingman Cheung (UC-Davis) | A monte carlo study of the rare decay $B \to X_s \ell^+ \ell^-$ | 9 pages, 6 figures | Phys.Rev. D59 (1999) 097501 | 10.1103/PhysRevD.59.097501 | UCD-98-16 | hep-ph | null | We study, using a monte carlo approach, the rare decay $B\to X_s \ell^+
\ell^-$ including effects of the arbitrariness of the phase between the $\psi$
amplitudes and the perturbative amplitude, $b$-quark fermi motion inside the
$B$ meson, and experimental smearing of lepton momenta. The fermi motion of
$b$-quark inside the $B$ meson is modeled by the ACCMM model. We found that
such effects reduce the sensitivities of the spectra of invariant mass and
forward-backward asymmetry of the lepton pair to new physics; especially, in
the neighborhood of the $\psi$ resonances. We also estimate the sensitivity
range of Wilson coefficients with respect to the uncertainties.
| [
{
"created": "Thu, 24 Sep 1998 00:39:15 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Cheung",
"Kingman",
"",
"UC-Davis"
]
] | We study, using a monte carlo approach, the rare decay $B\to X_s \ell^+ \ell^-$ including effects of the arbitrariness of the phase between the $\psi$ amplitudes and the perturbative amplitude, $b$-quark fermi motion inside the $B$ meson, and experimental smearing of lepton momenta. The fermi motion of $b$-quark inside the $B$ meson is modeled by the ACCMM model. We found that such effects reduce the sensitivities of the spectra of invariant mass and forward-backward asymmetry of the lepton pair to new physics; especially, in the neighborhood of the $\psi$ resonances. We also estimate the sensitivity range of Wilson coefficients with respect to the uncertainties. |
1807.00629 | Ricardo Cepedello | Ricardo Cepedello, Renato M. Fonseca, Martin Hirsch | Systematic classification of three-loop realizations of the Weinberg
operator | Erratum added, published version in JHEP | JHEP1810(2018)197; JHEP1906(2019)034 | 10.1007/JHEP10(2018)197; 10.1007/JHEP06(2019)034 | IFIC/18-20 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study systematically the decomposition of the Weinberg operator at
three-loop order. There are more than four thousand connected topologies.
However, the vast majority of these are infinite corrections to lower order
neutrino mass diagrams and only a very small percentage yields models for which
the three-loop diagrams are the leading order contribution to the neutrino mass
matrix. We identify 73 topologies that can lead to genuine three-loop models
with fermions and scalars, i.e. models for which lower order diagrams are
automatically absent without the need to invoke additional symmetries. The 73
genuine topologies can be divided into two sub-classes: Normal genuine ones (44
cases) and special genuine topologies (29 cases). The latter are a special
class of topologies, which can lead to genuine diagrams only for very specific
choices of fields. The genuine topologies generate 374 diagrams in the weak
basis, which can be reduced to only 30 distinct diagrams in the mass eigenstate
basis. We also discuss how all the mass eigenstate diagrams can be described in
terms of only five master integrals. We present some concrete models and for
two of them we give numerical estimates for the typical size of neutrino masses
they generate. Our results can be readily applied to construct other $d=5$
neutrino mass models with three loops.
| [
{
"created": "Mon, 2 Jul 2018 12:35:31 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Nov 2018 18:11:50 GMT",
"version": "v2"
},
{
"created": "Tue, 18 Jun 2019 15:29:04 GMT",
"version": "v3"
}
] | 2019-06-19 | [
[
"Cepedello",
"Ricardo",
""
],
[
"Fonseca",
"Renato M.",
""
],
[
"Hirsch",
"Martin",
""
]
] | We study systematically the decomposition of the Weinberg operator at three-loop order. There are more than four thousand connected topologies. However, the vast majority of these are infinite corrections to lower order neutrino mass diagrams and only a very small percentage yields models for which the three-loop diagrams are the leading order contribution to the neutrino mass matrix. We identify 73 topologies that can lead to genuine three-loop models with fermions and scalars, i.e. models for which lower order diagrams are automatically absent without the need to invoke additional symmetries. The 73 genuine topologies can be divided into two sub-classes: Normal genuine ones (44 cases) and special genuine topologies (29 cases). The latter are a special class of topologies, which can lead to genuine diagrams only for very specific choices of fields. The genuine topologies generate 374 diagrams in the weak basis, which can be reduced to only 30 distinct diagrams in the mass eigenstate basis. We also discuss how all the mass eigenstate diagrams can be described in terms of only five master integrals. We present some concrete models and for two of them we give numerical estimates for the typical size of neutrino masses they generate. Our results can be readily applied to construct other $d=5$ neutrino mass models with three loops. |
2011.06609 | Salvador Centelles Chuli\'a | Salvador Centelles Chuli\'a, Rahul Srivastava and Avelino Vicente | The Inverse Seesaw Family: Dirac And Majorana | 32 pages, 11 tables, 8 figures | null | null | IFIC/20-47 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | After developing a general criterion for deciding which neutrino mass models
belong to the category of inverse seesaw models, we apply it to obtain the
Dirac analogue of the canonical Majorana inverse seesaw model. We then
generalize the inverse seesaw model and obtain a class of inverse seesaw
mechanisms both for Majorana and Dirac neutrinos. We further show that many of
the models have double or multiple suppressions coming from tiny symmetry
breaking "$\mu$-terms". These models can be tested both in colliders and with
the observation of lepton flavour violating processes.
| [
{
"created": "Thu, 12 Nov 2020 19:00:14 GMT",
"version": "v1"
}
] | 2020-11-16 | [
[
"Chuliá",
"Salvador Centelles",
""
],
[
"Srivastava",
"Rahul",
""
],
[
"Vicente",
"Avelino",
""
]
] | After developing a general criterion for deciding which neutrino mass models belong to the category of inverse seesaw models, we apply it to obtain the Dirac analogue of the canonical Majorana inverse seesaw model. We then generalize the inverse seesaw model and obtain a class of inverse seesaw mechanisms both for Majorana and Dirac neutrinos. We further show that many of the models have double or multiple suppressions coming from tiny symmetry breaking "$\mu$-terms". These models can be tested both in colliders and with the observation of lepton flavour violating processes. |
hep-ph/9709411 | Jonathan Feng | Jonathan L. Feng, Takeo Moroi, Hitoshi Murayama, Erhard Schnapka | Third Generation Familons, B Factories, and Neutrino Cosmology | ReVTeX, 33 pages, 6 figures, notation improved, references added,
revised to conform to pubished version | Phys. Rev. D 57, 5875 (1998) | 10.1103/PhysRevD.57.5875 | LBNL-40822, UCB-PTH-97/47 | hep-ph astro-ph hep-ex | null | We study the physics of spontaneously broken family symmetries acting on the
third generation. Massless familons (or Majorons) $f$ associated with such
broken symmetries are motivated especially by cosmological scenarios with
decaying tau neutrinos. We first note that, in marked contrast with the case
for the first two generations, constraints on third generation familon
couplings are poor, and are, in fact, non-existent at present in the hadronic
sector. We derive new bounds from $B^0$--$\bar{B}^0$ mixing, $B^0 \to l^+
l'^-$, $b\to s\nu\bar{\nu}$, and astrophysics. The resulting constraints on
familon decay constants are still much weaker than those for the first and
second generation. We then discuss the promising prospects for significant
improvements from searches for $\tau\to l f$, $B\to (\pi, K) f$, and $b\to
(d,s) f$ with the current CLEO, ARGUS, and LEP data. Finally, we note that
future constraints from CLEO III and the $B$ factories will probe decay
constants beyond 10^8 GeV, well within regions of parameter space favored by
proposed scenarios in neutrino cosmology.
| [
{
"created": "Sat, 20 Sep 1997 01:49:47 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Oct 1997 01:59:01 GMT",
"version": "v2"
},
{
"created": "Tue, 17 Feb 1998 02:05:11 GMT",
"version": "v3"
}
] | 2016-08-25 | [
[
"Feng",
"Jonathan L.",
""
],
[
"Moroi",
"Takeo",
""
],
[
"Murayama",
"Hitoshi",
""
],
[
"Schnapka",
"Erhard",
""
]
] | We study the physics of spontaneously broken family symmetries acting on the third generation. Massless familons (or Majorons) $f$ associated with such broken symmetries are motivated especially by cosmological scenarios with decaying tau neutrinos. We first note that, in marked contrast with the case for the first two generations, constraints on third generation familon couplings are poor, and are, in fact, non-existent at present in the hadronic sector. We derive new bounds from $B^0$--$\bar{B}^0$ mixing, $B^0 \to l^+ l'^-$, $b\to s\nu\bar{\nu}$, and astrophysics. The resulting constraints on familon decay constants are still much weaker than those for the first and second generation. We then discuss the promising prospects for significant improvements from searches for $\tau\to l f$, $B\to (\pi, K) f$, and $b\to (d,s) f$ with the current CLEO, ARGUS, and LEP data. Finally, we note that future constraints from CLEO III and the $B$ factories will probe decay constants beyond 10^8 GeV, well within regions of parameter space favored by proposed scenarios in neutrino cosmology. |
1903.11911 | Shuntaro Sakai | J. Nieves, R. Pavao, S. Sakai | $\Lambda_b$ decays into $\Lambda_c^*\ell\bar{\nu}_\ell$ and
$\Lambda_c^*\pi^-$ $[\Lambda_c^*=\Lambda_c(2595)$ \& $\Lambda_c(2625)]$ and
heavy quark spin symmetry | 22 pages, 2 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the implications for $\Lambda_b \to \Lambda_c^*\ell\bar{\nu}_\ell$
and $\Lambda_b \to \Lambda_c^*\pi^-$ $[\Lambda_c^*=\Lambda_c(2595)$ and
$\Lambda_c(2625)]$ decays that can be deduced from heavy quark spin symmetry
(HQSS). Identifying the odd parity $\Lambda_c(2595)$ and $\Lambda_c(2625)$
resonances as HQSS partners, with total angular momentum--parity $j_q^P=1^-$
for the light degrees of freedom, we find that the ratios
$\Gamma(\Lambda_b\rightarrow\Lambda_c(2595)\pi^-)/\Gamma(\Lambda_b\rightarrow\Lambda_c(2625)\pi^-)$
and $\Gamma(\Lambda_b\rightarrow \Lambda_c(2595) \ell \bar{\nu}_\ell)/
\Gamma(\Lambda_b\rightarrow\Lambda_c(2625) \ell \bar{\nu}_\ell)$ agree, within
errors, with the experimental values given in the Review of Particle Physics.
We discuss how future, and more precise, measurements of the above branching
fractions could be used to shed light into the inner HQSS structure of the
narrow $\Lambda_c(2595)$ odd-parity resonance. Namely, we show that such
studies would constrain the existence of a sizable $j^P_q=0^-$ component in its
wave-function, and/or of a two-pole pattern, in analogy to the case of the
similar $\Lambda(1405)$ resonance in the strange sector, as suggested by most
of the approaches that describe the $\Lambda_c(2595)$ as a hadron molecule. We
also investigate the lepton flavor universality ratios $R[\Lambda_c^*] = {\cal
B}(\Lambda_b \to \Lambda_c^* \tau\,\bar\nu_\tau)/{\cal B}(\Lambda_b \to
\Lambda_c^* \mu\,\bar\nu_\mu)$, and discuss how $R[\Lambda_c(2595)]$ may be
affected by a new source of potentially large systematic errors if there are
two $\Lambda_c(2595)$ poles.
| [
{
"created": "Thu, 28 Mar 2019 12:16:43 GMT",
"version": "v1"
},
{
"created": "Mon, 27 May 2019 11:36:51 GMT",
"version": "v2"
}
] | 2019-05-28 | [
[
"Nieves",
"J.",
""
],
[
"Pavao",
"R.",
""
],
[
"Sakai",
"S.",
""
]
] | We study the implications for $\Lambda_b \to \Lambda_c^*\ell\bar{\nu}_\ell$ and $\Lambda_b \to \Lambda_c^*\pi^-$ $[\Lambda_c^*=\Lambda_c(2595)$ and $\Lambda_c(2625)]$ decays that can be deduced from heavy quark spin symmetry (HQSS). Identifying the odd parity $\Lambda_c(2595)$ and $\Lambda_c(2625)$ resonances as HQSS partners, with total angular momentum--parity $j_q^P=1^-$ for the light degrees of freedom, we find that the ratios $\Gamma(\Lambda_b\rightarrow\Lambda_c(2595)\pi^-)/\Gamma(\Lambda_b\rightarrow\Lambda_c(2625)\pi^-)$ and $\Gamma(\Lambda_b\rightarrow \Lambda_c(2595) \ell \bar{\nu}_\ell)/ \Gamma(\Lambda_b\rightarrow\Lambda_c(2625) \ell \bar{\nu}_\ell)$ agree, within errors, with the experimental values given in the Review of Particle Physics. We discuss how future, and more precise, measurements of the above branching fractions could be used to shed light into the inner HQSS structure of the narrow $\Lambda_c(2595)$ odd-parity resonance. Namely, we show that such studies would constrain the existence of a sizable $j^P_q=0^-$ component in its wave-function, and/or of a two-pole pattern, in analogy to the case of the similar $\Lambda(1405)$ resonance in the strange sector, as suggested by most of the approaches that describe the $\Lambda_c(2595)$ as a hadron molecule. We also investigate the lepton flavor universality ratios $R[\Lambda_c^*] = {\cal B}(\Lambda_b \to \Lambda_c^* \tau\,\bar\nu_\tau)/{\cal B}(\Lambda_b \to \Lambda_c^* \mu\,\bar\nu_\mu)$, and discuss how $R[\Lambda_c(2595)]$ may be affected by a new source of potentially large systematic errors if there are two $\Lambda_c(2595)$ poles. |
1002.0692 | Shaaban Khalil | Shaaban Khalil, Hye-Sung Lee, and Ernest Ma | Bound on Z' Mass from CDMS II in the Dark Left-Right Gauge Model II | 11 pages | Phys.Rev.D81:051702,2010 | 10.1103/PhysRevD.81.051702 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | With the recent possible signal of dark matter from the CDMS II experiment,
the Z' mass of a new version of the dark left-right gauge model (DLRM II) is
predicted to be at around a TeV. As such, it has an excellent discovery
prognosis at the operating Large Hadron Collider.
| [
{
"created": "Wed, 3 Feb 2010 10:14:45 GMT",
"version": "v1"
}
] | 2014-11-20 | [
[
"Khalil",
"Shaaban",
""
],
[
"Lee",
"Hye-Sung",
""
],
[
"Ma",
"Ernest",
""
]
] | With the recent possible signal of dark matter from the CDMS II experiment, the Z' mass of a new version of the dark left-right gauge model (DLRM II) is predicted to be at around a TeV. As such, it has an excellent discovery prognosis at the operating Large Hadron Collider. |
hep-ph/0211343 | Erhan Iltan | E. Iltan (METU, Ankara), H. Sundu (METU, Ankara) | H^+ -> W^+ l_i^- l_j^+$ decay in the two Higgs doublet model | 8 pages, 7 Figures | Phys.Rev.D67:035006,2003 | 10.1103/PhysRevD.67.035006 | null | hep-ph | null | We study the lepton flavor violating H^+ -> W^+ l_i^- l_j^+ and the lepton
flavor conserving $H^+ -> W^+ l_i^- l_i^+ (l_i=\tau, l_j=\mu) decays in the
general 2HDM, so called model III. We estimate the decay width \Gamma for LFV
(LFC) at the order of the magnitude of (10^{-11}-10^{-5}) GeV
((10^{-9}-10^{-4}) GeV), for 200 GeV\leq m_{H^\pm}\leq 400
GeV, and the intermediate values of the coupling
\bar{\xi}^{E}_{N,\tau \mu}\sim 5 GeV (\bar{\xi}^{E}_{N,\tau
\tau}\sim 30 GeV). We observe that the experimental result of the process
under consideration can give comprehensive information about the physics beyond
the standard model and the existing free parameters.
| [
{
"created": "Thu, 21 Nov 2002 21:48:06 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Jan 2003 10:24:02 GMT",
"version": "v2"
}
] | 2011-03-23 | [
[
"Iltan",
"E.",
"",
"METU, Ankara"
],
[
"Sundu",
"H.",
"",
"METU, Ankara"
]
] | We study the lepton flavor violating H^+ -> W^+ l_i^- l_j^+ and the lepton flavor conserving $H^+ -> W^+ l_i^- l_i^+ (l_i=\tau, l_j=\mu) decays in the general 2HDM, so called model III. We estimate the decay width \Gamma for LFV (LFC) at the order of the magnitude of (10^{-11}-10^{-5}) GeV ((10^{-9}-10^{-4}) GeV), for 200 GeV\leq m_{H^\pm}\leq 400 GeV, and the intermediate values of the coupling \bar{\xi}^{E}_{N,\tau \mu}\sim 5 GeV (\bar{\xi}^{E}_{N,\tau \tau}\sim 30 GeV). We observe that the experimental result of the process under consideration can give comprehensive information about the physics beyond the standard model and the existing free parameters. |
hep-ph/0610111 | Peter Levai | G. Fai, P. Levai, G. Papp | From di-hadron correlations to parton intrinsic transverse momentum in
proton-proton collisions | Talk given at 2nd International Conference on Hard and
Electromagnetic Probes of High-Energy Nuclear Collisions (Hard Probes 2006),
Asilomar, Pacific Grove, California, 9-16 Jun 2006 | Nucl.Phys.A783:535-538,2007 | 10.1016/j.nuclphysa.2006.11.017 | null | hep-ph | null | Di-hadron correlations in proton-proton collisions at s^1/2 = 200 GeV are
interpreted in terms of a fragmentation width and a momentum imbalance. A
fragmentation width of 580 +- 50 GeV/c is obtained, and the momentum imbalance
gives an `intrinsic' transverse momentum width of partons in the proton of 2.6
+- 0.2 GeV/c.
| [
{
"created": "Tue, 10 Oct 2006 16:00:32 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Fai",
"G.",
""
],
[
"Levai",
"P.",
""
],
[
"Papp",
"G.",
""
]
] | Di-hadron correlations in proton-proton collisions at s^1/2 = 200 GeV are interpreted in terms of a fragmentation width and a momentum imbalance. A fragmentation width of 580 +- 50 GeV/c is obtained, and the momentum imbalance gives an `intrinsic' transverse momentum width of partons in the proton of 2.6 +- 0.2 GeV/c. |
1803.00234 | Hayato Ito | Hayato Ito, Osamu Jinnouchi, Takeo Moroi, Natsumi Nagata, and
Hidetoshi Otono | Searching for Metastable Particles with Sub-Millimeter Displaced
Vertices at Hadron Colliders | 55 pages, 24 figures | null | 10.1007/JHEP06(2018)112 | UT-18-03, KYUSHU-RCAPP-2018-01 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A variety of new-physics models predict metastable particles whose decay
length is $\lesssim 1$ mm. Conventional displaced-vertex searches are less
sensitive to this sub-millimeter decay range, and thus such metastable
particles have been looked for only in usual prompt decay searches. In this
paper, we show that an additional event-selection cut based on the vertex
reconstruction using charged tracks considerably improves the sensitivity of
ordinary searches which rely only on kinematic selection criteria, for
particles with a decay length of $\gtrsim 100$ $\mu \text{m}$. To that end, we
consider a metastable gluino as an example, and study the impact of this new
event-selection cut on gluino searches at the LHC by simulating both the signal
and Standard Model background processes. Uncertainty of the displaced-vertex
reconstruction due to the limited resolution of track reconstruction is taken
into account. We also discuss possibilities for optimization of the kinematic
selection criteria, which takes advantage of significant reduction of
background through the requirement of displaced vertices. In addition, we
demonstrate that using the method discussed in this paper it is possible to
measure the lifetime of metastable particles with an ${\cal O}(1)$ accuracy at
the high-luminosity LHC. Implications for a future 100 TeV collider are also
studied, where produced particles tend to be more boosted and thus it is easier
to detect the longevity of metastable particles.
| [
{
"created": "Thu, 1 Mar 2018 07:30:36 GMT",
"version": "v1"
}
] | 2018-08-01 | [
[
"Ito",
"Hayato",
""
],
[
"Jinnouchi",
"Osamu",
""
],
[
"Moroi",
"Takeo",
""
],
[
"Nagata",
"Natsumi",
""
],
[
"Otono",
"Hidetoshi",
""
]
] | A variety of new-physics models predict metastable particles whose decay length is $\lesssim 1$ mm. Conventional displaced-vertex searches are less sensitive to this sub-millimeter decay range, and thus such metastable particles have been looked for only in usual prompt decay searches. In this paper, we show that an additional event-selection cut based on the vertex reconstruction using charged tracks considerably improves the sensitivity of ordinary searches which rely only on kinematic selection criteria, for particles with a decay length of $\gtrsim 100$ $\mu \text{m}$. To that end, we consider a metastable gluino as an example, and study the impact of this new event-selection cut on gluino searches at the LHC by simulating both the signal and Standard Model background processes. Uncertainty of the displaced-vertex reconstruction due to the limited resolution of track reconstruction is taken into account. We also discuss possibilities for optimization of the kinematic selection criteria, which takes advantage of significant reduction of background through the requirement of displaced vertices. In addition, we demonstrate that using the method discussed in this paper it is possible to measure the lifetime of metastable particles with an ${\cal O}(1)$ accuracy at the high-luminosity LHC. Implications for a future 100 TeV collider are also studied, where produced particles tend to be more boosted and thus it is easier to detect the longevity of metastable particles. |
hep-ph/0205023 | Arnd Brandenburg | A. Brandenburg, Z.G. Si, P. Uwer | QCD-corrected spin analysing power of jets in decays of polarized top
quarks | 11 pages | Phys.Lett. B539 (2002) 235-241 | 10.1016/S0370-2693(02)02098-1 | PITHA 02/07, DESY 02-055, TTP02-04 | hep-ph | null | We present results for the differential distributions of jets from
non-leptonic decays of polarized top quarks within the Standard Model,
including QCD radiative corrections. Our work extends existing results which
are only available for semileptonic top quark decays at the parton level. For
$t(\uparrow)$ -> b-jet + 2 light jets we compute in particular the
QCD-corrected top-spin analysing power of the b-quark jet and the least
energetic light jet. The dependence of the results on the choice of the jet
recombination scheme is found to be small. In addition we compute the spin
analysing power of the thrust axis. Our results constitute a so far missing
ingredient to analyse top quark production and subsequent non-leptonic decay at
next-to-leading order in alpha_s, keeping the full information on the top quark
polarization.
| [
{
"created": "Thu, 2 May 2002 15:55:30 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Brandenburg",
"A.",
""
],
[
"Si",
"Z. G.",
""
],
[
"Uwer",
"P.",
""
]
] | We present results for the differential distributions of jets from non-leptonic decays of polarized top quarks within the Standard Model, including QCD radiative corrections. Our work extends existing results which are only available for semileptonic top quark decays at the parton level. For $t(\uparrow)$ -> b-jet + 2 light jets we compute in particular the QCD-corrected top-spin analysing power of the b-quark jet and the least energetic light jet. The dependence of the results on the choice of the jet recombination scheme is found to be small. In addition we compute the spin analysing power of the thrust axis. Our results constitute a so far missing ingredient to analyse top quark production and subsequent non-leptonic decay at next-to-leading order in alpha_s, keeping the full information on the top quark polarization. |
0911.1156 | Bo-Qiang Ma | Yan Chen, Bo-Qiang Ma | Light flavor baryon spectrum with higher order hyperfine interactions | 31 latex pages, final version in journal publication | Nucl.Phys.A831:1-21,2009 | 10.1016/j.nuclphysa.2009.09.005 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the spectrum of light flavor baryons in a quark-model framework by
taking into account the order $\mathrm{O}(\alpha_s^2)$ hyperfine interactions
due to two-gluon exchange between quarks. The calculated spectrum agree better
with the experimental data than the results from hyperfine interactions with
only one-gluon exchange. It is also shown that two-gluon exchange hyperfine
interactions bring a significantly improved correction to the Gell-Mann--Okubo
mass formula. Two-gluon exchange corrections on baryon excitations (including
negative parity baryons) are also briefly discussed.
| [
{
"created": "Fri, 6 Nov 2009 00:52:01 GMT",
"version": "v1"
}
] | 2010-03-11 | [
[
"Chen",
"Yan",
""
],
[
"Ma",
"Bo-Qiang",
""
]
] | We study the spectrum of light flavor baryons in a quark-model framework by taking into account the order $\mathrm{O}(\alpha_s^2)$ hyperfine interactions due to two-gluon exchange between quarks. The calculated spectrum agree better with the experimental data than the results from hyperfine interactions with only one-gluon exchange. It is also shown that two-gluon exchange hyperfine interactions bring a significantly improved correction to the Gell-Mann--Okubo mass formula. Two-gluon exchange corrections on baryon excitations (including negative parity baryons) are also briefly discussed. |
1710.00272 | Wei Tang | Wei Tang | Search for Massive Bosons Decaying to Wg and Zg Using the ATLAS Detector | Talk presented at the APS Division of Particles and Fields Meeting
(DPF 2017), July 31-August 4, 2017, Fermilab. C170731. 12 pages, 15 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Standard Model is by far the most encompassing physics theory. With the
recent discovery of the Higgs Boson, the Standard Model has performed extremely
well against experimental data. However, the theory is intrinsically not
complete, it does not address physical phenomenon such as gravity and dark
matter. Many proposals for physics beyond the Standard Model predict new
massive bosons from additional gauge fields or extended Higgs sectors. This
paper examines a preliminary search of possible V gamma decay channels of
proposed new bosons.
| [
{
"created": "Sun, 1 Oct 2017 00:02:49 GMT",
"version": "v1"
}
] | 2017-10-03 | [
[
"Tang",
"Wei",
""
]
] | The Standard Model is by far the most encompassing physics theory. With the recent discovery of the Higgs Boson, the Standard Model has performed extremely well against experimental data. However, the theory is intrinsically not complete, it does not address physical phenomenon such as gravity and dark matter. Many proposals for physics beyond the Standard Model predict new massive bosons from additional gauge fields or extended Higgs sectors. This paper examines a preliminary search of possible V gamma decay channels of proposed new bosons. |
hep-ph/0703291 | Pavel Bolokhov | Pavel A. Bolokhov, Maxim Pospelov | Classification of Dimension 5 Lorentz Violating Interactions in the
Standard Model | 26 pages | Phys.Rev.D77:025022,2008 | 10.1103/PhysRevD.77.025022 | UVIC-TH-06-13 | hep-ph hep-th | null | We give a complete classification of mass dimension five
Lorentz-non-invariant interactions composed from the Standard Model fields,
using the effective field theory approach. We identify different classes of
Lorentz violating operators, some of which are protected against transmutation
to lower dimensions even at the loop level. Within each class of operators we
determine a typical experimental sensitivity to the size of Lorentz violation.
| [
{
"created": "Tue, 27 Mar 2007 21:22:50 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Nov 2007 04:01:52 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Bolokhov",
"Pavel A.",
""
],
[
"Pospelov",
"Maxim",
""
]
] | We give a complete classification of mass dimension five Lorentz-non-invariant interactions composed from the Standard Model fields, using the effective field theory approach. We identify different classes of Lorentz violating operators, some of which are protected against transmutation to lower dimensions even at the loop level. Within each class of operators we determine a typical experimental sensitivity to the size of Lorentz violation. |
0806.4890 | Graeme Watt | G. Watt, A. D. Martin, W. J. Stirling, R. S. Thorne | Recent Progress in Global PDF Analysis | 4 pages, 2 figures. To appear in the proceedings of the 16th
International Workshop on Deep-Inelastic Scattering and Related Subjects (DIS
2008), London, England, 7-11 April 2008 | null | null | IPPP/08/47, DCPT/08/94 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss selected topics in the forthcoming MSTW 2008 determination of
parton distributions by global analysis. The tolerance parameter controlling
the uncertainties on the parton distributions is now determined by a new
dynamic procedure for each eigenvector of the covariance matrix. New data sets
fitted include Tevatron Run II data on inclusive jet production, the lepton
charge asymmetry from W decays and the Z rapidity distribution. Predictions are
given for the total W and Z cross sections at the Tevatron and LHC.
| [
{
"created": "Mon, 30 Jun 2008 16:10:15 GMT",
"version": "v1"
}
] | 2008-07-01 | [
[
"Watt",
"G.",
""
],
[
"Martin",
"A. D.",
""
],
[
"Stirling",
"W. J.",
""
],
[
"Thorne",
"R. S.",
""
]
] | We discuss selected topics in the forthcoming MSTW 2008 determination of parton distributions by global analysis. The tolerance parameter controlling the uncertainties on the parton distributions is now determined by a new dynamic procedure for each eigenvector of the covariance matrix. New data sets fitted include Tevatron Run II data on inclusive jet production, the lepton charge asymmetry from W decays and the Z rapidity distribution. Predictions are given for the total W and Z cross sections at the Tevatron and LHC. |
1110.6762 | Akin Wingerter | Akin Wingerter and Krishna Mohan Parattu | A Scan for Models of Neutrino Mixing from Non-Abelian Discrete
Symmetries | Contribution to the proceedings of "The 2011 Europhysics Conference
on High Energy Physics-HEP 2011", July 21-27, 2011, Grenoble, France | null | null | LPSC-11234 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The structure of the neutrino mixing matrix is indicative of an underlying
family symmetry that interrelates the three generations of fermions in the
Standard Model. We systematically scan the parameter space of 76 discrete
non-Abelian family symmetries and construct all models with the Standard Model
particle content and up to three flavon fields where we include
non-renormalizable interactions of mass dimension five and six. We find that of
the 76 groups that we considered, 44 groups can accommodate models that are
consistent with experiment at 3sigma, and 38 groups can have models that are
tribimaximal. One immediate consequence is that A4 is not "special", but should
be considered on equal footing with other groups such as T7 that is the
smallest group for which we find tribimaximal mixing, and T13 that has the
largest fraction of TBM models. We present the details of a model with
theta12=33.9, theta23=49.1, theta13=5.1 to show that a non-zero theta13 can
easily be accommodated.
| [
{
"created": "Mon, 31 Oct 2011 12:14:27 GMT",
"version": "v1"
}
] | 2011-11-01 | [
[
"Wingerter",
"Akin",
""
],
[
"Parattu",
"Krishna Mohan",
""
]
] | The structure of the neutrino mixing matrix is indicative of an underlying family symmetry that interrelates the three generations of fermions in the Standard Model. We systematically scan the parameter space of 76 discrete non-Abelian family symmetries and construct all models with the Standard Model particle content and up to three flavon fields where we include non-renormalizable interactions of mass dimension five and six. We find that of the 76 groups that we considered, 44 groups can accommodate models that are consistent with experiment at 3sigma, and 38 groups can have models that are tribimaximal. One immediate consequence is that A4 is not "special", but should be considered on equal footing with other groups such as T7 that is the smallest group for which we find tribimaximal mixing, and T13 that has the largest fraction of TBM models. We present the details of a model with theta12=33.9, theta23=49.1, theta13=5.1 to show that a non-zero theta13 can easily be accommodated. |
1903.10506 | Ivo de Medeiros Varzielas | Ivo de Medeiros Varzielas, Miguel Levy, Ye-Ling Zhou | Effective alignments and the landscape of $S_4$ flavour models | 18 pages, 5 figures, 6 tables | Phys. Rev. D 100, 035027 (2019) | 10.1103/PhysRevD.100.035027 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore the concept of effective alignments: contractions of multiple
flavour symmetry breaking flavon fields. These contractions give rise to
directions that are hard or impossible to obtain directly by breaking the
flavour symmetry. Within this context, and using $S_4$ as the flavour symmetry
to exemplify, we perform a phenomenological check of lepton flavour models
built from pairing any two effective alignments up to order 2 (in flavon
contractions). The check is performed for each pair of effective alignments in
a framework with models of constrained sequential dominance type, in a basis
where the charged leptons are diagonal. We thus obtain an indication of which
effective alignments are interesting for model building, within this so-called
$S_4$ landscape. We find three types of viable topologies and provide examples
of models realizing this strategy for each topology.
| [
{
"created": "Mon, 25 Mar 2019 18:00:00 GMT",
"version": "v1"
}
] | 2019-09-04 | [
[
"Varzielas",
"Ivo de Medeiros",
""
],
[
"Levy",
"Miguel",
""
],
[
"Zhou",
"Ye-Ling",
""
]
] | We explore the concept of effective alignments: contractions of multiple flavour symmetry breaking flavon fields. These contractions give rise to directions that are hard or impossible to obtain directly by breaking the flavour symmetry. Within this context, and using $S_4$ as the flavour symmetry to exemplify, we perform a phenomenological check of lepton flavour models built from pairing any two effective alignments up to order 2 (in flavon contractions). The check is performed for each pair of effective alignments in a framework with models of constrained sequential dominance type, in a basis where the charged leptons are diagonal. We thus obtain an indication of which effective alignments are interesting for model building, within this so-called $S_4$ landscape. We find three types of viable topologies and provide examples of models realizing this strategy for each topology. |
1203.6618 | John M. Cornwall | John M. Cornwall | Entropy in quantum chromodynamics | 22 pages, 2 figures. Preprint version of invited review for Modern
Physics Letters A | Modern Physics Letters A {\bf 27}, 1230011 (2012) | 10.1142/S021773231230011X | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review the role of zero-temperature entropy in several closely-related
contexts in QCD. The first is entropy associated with disordered condensates,
including $< G_{\mu\nu}^2>$. The second is vacuum entropy arising from QCD
solitons such as center vortices, yielding confinement and chiral symmetry
breaking. The third is entanglement entropy, which is entropy associated with a
pure state, such as the QCD vacuum, when the state is partially unobserved and
unknown. Typically, entanglement entropy of an unobserved three-volume scales
not with the volume but with the area of its bounding surface. The fourth
manifestation of entropy in QCD is the configurational entropy of
light-particle world-lines and flux tubes; we argue that this entropy is
critical for understanding how confinement produces chiral symmetry breakdown,
as manifested by a dynamically-massive quark, a massless pion, and a $<
\bar{q}q>$ condensate.
| [
{
"created": "Thu, 29 Mar 2012 18:21:54 GMT",
"version": "v1"
}
] | 2012-03-30 | [
[
"Cornwall",
"John M.",
""
]
] | We review the role of zero-temperature entropy in several closely-related contexts in QCD. The first is entropy associated with disordered condensates, including $< G_{\mu\nu}^2>$. The second is vacuum entropy arising from QCD solitons such as center vortices, yielding confinement and chiral symmetry breaking. The third is entanglement entropy, which is entropy associated with a pure state, such as the QCD vacuum, when the state is partially unobserved and unknown. Typically, entanglement entropy of an unobserved three-volume scales not with the volume but with the area of its bounding surface. The fourth manifestation of entropy in QCD is the configurational entropy of light-particle world-lines and flux tubes; we argue that this entropy is critical for understanding how confinement produces chiral symmetry breakdown, as manifested by a dynamically-massive quark, a massless pion, and a $< \bar{q}q>$ condensate. |
0905.3749 | Jeremy Mardon | Jeremy Mardon, Yasunori Nomura, Jesse Thaler | Cosmic Signals from the Hidden Sector | 40 pages, 7 figures; references and comments added | Phys.Rev.D80:035013,2009 | 10.1103/PhysRevD.80.035013 | UCB-PTH-09/18 | hep-ph astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Cosmologically long-lived, composite states arise as natural dark matter
candidates in theories with a strongly interacting hidden sector at a scale of
10 - 100 TeV. Light axion-like states, with masses in the 1 MeV - 10 GeV range,
are also generic, and can decay via Higgs couplings to light standard model
particles. Such a scenario is well motivated in the context of very low energy
supersymmetry breaking, where ubiquitous cosmological problems associated with
the gravitino are avoided. We investigate the astrophysical and collider
signatures of this scenario, assuming that dark matter decays into the
axion-like states via dimension six operators, and we present an illustrative
model exhibiting these features. We conclude that the recent data from PAMELA,
FERMI, and H.E.S.S. points to this setup as a compelling paradigm for dark
matter. This has important implications for future diffuse gamma ray
measurements and collider searches.
| [
{
"created": "Sat, 23 May 2009 22:17:43 GMT",
"version": "v1"
},
{
"created": "Wed, 3 Jun 2009 23:42:01 GMT",
"version": "v2"
}
] | 2010-05-28 | [
[
"Mardon",
"Jeremy",
""
],
[
"Nomura",
"Yasunori",
""
],
[
"Thaler",
"Jesse",
""
]
] | Cosmologically long-lived, composite states arise as natural dark matter candidates in theories with a strongly interacting hidden sector at a scale of 10 - 100 TeV. Light axion-like states, with masses in the 1 MeV - 10 GeV range, are also generic, and can decay via Higgs couplings to light standard model particles. Such a scenario is well motivated in the context of very low energy supersymmetry breaking, where ubiquitous cosmological problems associated with the gravitino are avoided. We investigate the astrophysical and collider signatures of this scenario, assuming that dark matter decays into the axion-like states via dimension six operators, and we present an illustrative model exhibiting these features. We conclude that the recent data from PAMELA, FERMI, and H.E.S.S. points to this setup as a compelling paradigm for dark matter. This has important implications for future diffuse gamma ray measurements and collider searches. |
1508.05392 | David McKeen | Akshay Ghalsasi, David McKeen, Ann E. Nelson | Baryogenesis via Mesino Oscillations | 14 pages, 6 figures | Phys. Rev. D 92, 076014 (2015) | 10.1103/PhysRevD.92.076014 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a new mechanism for baryogenesis at the 1-200 MeV scale.
Enhancement of CP violation takes place via interference between oscillations
and decays of mesinos--bound states of a scalar quark and antiquark and their
CP conjugates. We present the mechanism in a simplified model with four new
fundamental particles, with masses between 300 GeV and 10 TeV, and show that
some of the experimentally allowed parameter space can give the observed
baryon-to-entropy ratio.
| [
{
"created": "Fri, 21 Aug 2015 20:06:02 GMT",
"version": "v1"
}
] | 2015-11-04 | [
[
"Ghalsasi",
"Akshay",
""
],
[
"McKeen",
"David",
""
],
[
"Nelson",
"Ann E.",
""
]
] | We propose a new mechanism for baryogenesis at the 1-200 MeV scale. Enhancement of CP violation takes place via interference between oscillations and decays of mesinos--bound states of a scalar quark and antiquark and their CP conjugates. We present the mechanism in a simplified model with four new fundamental particles, with masses between 300 GeV and 10 TeV, and show that some of the experimentally allowed parameter space can give the observed baryon-to-entropy ratio. |
hep-ph/9302284 | null | O.J.P. Eboli, M.C. Gonzalez-Garcia, F. Halzen and D. Zeppenfeld | Measuring the Gamma-Gamma Coupling of the Higgs at Linear Colliders | (Latex file, 5 pages, 3 figures avalaible upon request) MAD/PH/743 | Phys.Rev. D48 (1993) 1430-1432 | 10.1103/PhysRevD.48.1430 | null | hep-ph | null | Observing the production of the Higgs particle in the $\gamma$-$\gamma$ mode
of a linear $e^+e^-$ collider allows for the measurement of the $H\gamma\gamma$
coupling. We point out that for the intermediate Higgs mass range this
measurement is considerably more challenging than previously believed. The $b
\bar b$ signature receives a large background from the production of heavy
quark pairs by resolved photons. We quantify the experimental requirements
needed to make a meaningful measurement in the presence of this background.
| [
{
"created": "Sat, 20 Feb 1993 20:59:00 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Eboli",
"O. J. P.",
""
],
[
"Gonzalez-Garcia",
"M. C.",
""
],
[
"Halzen",
"F.",
""
],
[
"Zeppenfeld",
"D.",
""
]
] | Observing the production of the Higgs particle in the $\gamma$-$\gamma$ mode of a linear $e^+e^-$ collider allows for the measurement of the $H\gamma\gamma$ coupling. We point out that for the intermediate Higgs mass range this measurement is considerably more challenging than previously believed. The $b \bar b$ signature receives a large background from the production of heavy quark pairs by resolved photons. We quantify the experimental requirements needed to make a meaningful measurement in the presence of this background. |
0802.1061 | Carlos Luis Schat | Ezequiel Alvarez, Leandro Da Rold, Carlos Schat, Alejandro Szynkman | Electroweak precision constraints on the Lee-Wick Standard Model | 24 pages, 7 figures | JHEP0804:026,2008 | 10.1088/1126-6708/2008/04/026 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We perform an analysis of the electroweak precision observables in the
Lee-Wick Standard Model. The most stringent restrictions come from the S and T
parameters that receive important tree level and one loop contributions. In
general the model predicts a large positive S and a negative T. To reproduce
the electroweak data, if all the Lee-Wick masses are of the same order, the
Lee-Wick scale is of order 5 TeV. We show that it is possible to find some
regions in the parameter space with a fermionic state as light as 2.4-3.5 TeV,
at the price of rising all the other masses to be larger than 5-8 TeV. To
obtain a light Higgs with such heavy resonances a fine-tuning of order a few
per cent, at least, is needed. We also propose a simple extension of the model
including a fourth generation of Standard Model fermions with their Lee-Wick
partners. We show that in this case it is possible to pass the electroweak
constraints with Lee-Wick fermionic masses of order 0.4-1.5 TeV and Lee-Wick
gauge masses of order 3 TeV.
| [
{
"created": "Thu, 7 Feb 2008 20:38:51 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Alvarez",
"Ezequiel",
""
],
[
"Da Rold",
"Leandro",
""
],
[
"Schat",
"Carlos",
""
],
[
"Szynkman",
"Alejandro",
""
]
] | We perform an analysis of the electroweak precision observables in the Lee-Wick Standard Model. The most stringent restrictions come from the S and T parameters that receive important tree level and one loop contributions. In general the model predicts a large positive S and a negative T. To reproduce the electroweak data, if all the Lee-Wick masses are of the same order, the Lee-Wick scale is of order 5 TeV. We show that it is possible to find some regions in the parameter space with a fermionic state as light as 2.4-3.5 TeV, at the price of rising all the other masses to be larger than 5-8 TeV. To obtain a light Higgs with such heavy resonances a fine-tuning of order a few per cent, at least, is needed. We also propose a simple extension of the model including a fourth generation of Standard Model fermions with their Lee-Wick partners. We show that in this case it is possible to pass the electroweak constraints with Lee-Wick fermionic masses of order 0.4-1.5 TeV and Lee-Wick gauge masses of order 3 TeV. |
hep-ph/0307060 | Ulrich Jentschura | Ulrich D. Jentschura, Christoph H. Keitel and Krzysztof Pachucki | Two-Loop QED Bound-State Calculations and Squared Decay Rates | 12 pages, 2 figures, LaTeX | Can.J.Phys. 80 (2002) 1213-1223 | 10.1139/p02-081 | null | hep-ph | null | We discuss the epsilon-method as used in various recent QED bound-state
calculations by considering mathematical model examples. Recently obtained
results for higher-order self-energy binding corrections at the two-loop level
are reviewed. Problems associated with the interpretation of squared decay
rates as radiative bound-state energy level shifts are discussed. We briefly
expand on the relation of squared decay rates to nonresonant and radiative
corrections to the Lorentzian line shape, including their dependence on the
experimental process under study.
| [
{
"created": "Fri, 4 Jul 2003 11:29:09 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Jentschura",
"Ulrich D.",
""
],
[
"Keitel",
"Christoph H.",
""
],
[
"Pachucki",
"Krzysztof",
""
]
] | We discuss the epsilon-method as used in various recent QED bound-state calculations by considering mathematical model examples. Recently obtained results for higher-order self-energy binding corrections at the two-loop level are reviewed. Problems associated with the interpretation of squared decay rates as radiative bound-state energy level shifts are discussed. We briefly expand on the relation of squared decay rates to nonresonant and radiative corrections to the Lorentzian line shape, including their dependence on the experimental process under study. |
1905.09457 | Ruibo Li | Ruibo Li, Bo-Wen Wang, Kai Wang, Xiaoyuan Zhang, and Zhenyu Zhou | Probe Charm Yukawa at the future $e^{-}p$ and $e^{+}e^{-}$ colliders | 28 pages, 9 figures and 11 tables | Phys. Rev. D 100, 053008 (2019) | 10.1103/PhysRevD.100.053008 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Large Hadron Collider (LHC) has provided direct evidence of Yukawa couplings
between the third generation charged fermions and the 125 GeV Higgs boson.
Whether the first two generation charged fermions arise from exactly the same
mechanism becomes the next interesting question. Therefore, direct measurements
of charm or muon Yukawa couplings will be crucial to answering this puzzle. The
charm Yukawa measurement at the LHC suffers from severe QCD background and it
is extremely difficult to reach the sensitivity. In this paper, we compare the
potential of probing charm Yukawa coupling at the two proposed future "Higgs
Factory" experiments, the Large Hadron electron Collider (LHeC) and Circular
electron positron collider (CEPC). At the LHeC, Higgs bosons will be produced
via weak boson fusion and the energetic forward jet may suppress the background
significantly. However, due to huge $\gamma-g$ scattering background, the
potential of LHeC search is still limited. With $-80\%$ polarized electron beam
of 60 GeV, the signal significance can only reach $2\sigma$ for $
\kappa_{c}\simeq 1$ with a 3 ab$^{-1}$ integrated luminosity. In comparison,
measurement at the CEPC can then reach $8.0\sigma$ for $\kappa_{c}\simeq 1$
with a 2 ab$^{-1}$ of data.
| [
{
"created": "Thu, 23 May 2019 04:30:45 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Oct 2019 03:48:56 GMT",
"version": "v2"
}
] | 2019-10-16 | [
[
"Li",
"Ruibo",
""
],
[
"Wang",
"Bo-Wen",
""
],
[
"Wang",
"Kai",
""
],
[
"Zhang",
"Xiaoyuan",
""
],
[
"Zhou",
"Zhenyu",
""
]
] | Large Hadron Collider (LHC) has provided direct evidence of Yukawa couplings between the third generation charged fermions and the 125 GeV Higgs boson. Whether the first two generation charged fermions arise from exactly the same mechanism becomes the next interesting question. Therefore, direct measurements of charm or muon Yukawa couplings will be crucial to answering this puzzle. The charm Yukawa measurement at the LHC suffers from severe QCD background and it is extremely difficult to reach the sensitivity. In this paper, we compare the potential of probing charm Yukawa coupling at the two proposed future "Higgs Factory" experiments, the Large Hadron electron Collider (LHeC) and Circular electron positron collider (CEPC). At the LHeC, Higgs bosons will be produced via weak boson fusion and the energetic forward jet may suppress the background significantly. However, due to huge $\gamma-g$ scattering background, the potential of LHeC search is still limited. With $-80\%$ polarized electron beam of 60 GeV, the signal significance can only reach $2\sigma$ for $ \kappa_{c}\simeq 1$ with a 3 ab$^{-1}$ integrated luminosity. In comparison, measurement at the CEPC can then reach $8.0\sigma$ for $\kappa_{c}\simeq 1$ with a 2 ab$^{-1}$ of data. |
0910.1529 | Richard F. Lebed | Christopher D. Carone, Richard F. Lebed | Optimal Parametrization of Deviations from Tribimaximal Form of the
Neutrino Mass Matrix | 9 pages, no figures, ReVTeX. Improved treatment of Majorana phases,
added references | Phys.Rev.D80:117301,2009 | 10.1103/PhysRevD.80.117301 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We obtain a general parametrization for the neutrino Majorana mass matrix in
which all possible deviations from tribimaximal mixing are given by three
complex parameters, and the deviation from each tribimaximal mixing eigenvector
is identified with precisely two of them. This parametrization provides a
useful tool for classifying the corrections to exact tribimaximal mixing in
flavor models.
| [
{
"created": "Thu, 8 Oct 2009 15:19:56 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Oct 2009 19:45:16 GMT",
"version": "v2"
}
] | 2010-01-08 | [
[
"Carone",
"Christopher D.",
""
],
[
"Lebed",
"Richard F.",
""
]
] | We obtain a general parametrization for the neutrino Majorana mass matrix in which all possible deviations from tribimaximal mixing are given by three complex parameters, and the deviation from each tribimaximal mixing eigenvector is identified with precisely two of them. This parametrization provides a useful tool for classifying the corrections to exact tribimaximal mixing in flavor models. |
1406.2927 | Reza Moazzemi | Zohreh Bagherian, Mohammad Mahdi Ettefaghi, Zina Haghgouyan, Reza
Moazzemi | A new parameter space study of the singlet fermionic cold dark matter
model | 12 pages, 7 figures, revtex4 format, revised version, some references
added, to appear in JCAP | JCAP 10 (2014) 033 | 10.1088/1475-7516/2014/10/033 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the standard model (SM) extended by a gauge singlet fermion as
cold dark matter (SFCDM) and a gauge singlet scalar (singlet Higgs) as a
mediator. The parameter space of the SM is enlarged by seven new ones. We
obtain the total annihilation cross section of singlet fermions to the SM
particles and singlet Higgs at tree level. Regarding the relic abundance
constraint obtained by WMAP observations, we study the dependency on each
parameter separately, for dark matter masses up to 1 TeV. In particular, the
coupling of SFCDM to singlet Higgs $g_s$, the SFCDM mass $m_\psi$, the second
Higgs mass $m_{h_2}$, and the Higgs bosons mixing angel $\theta$ are
investigated accurately. Three other parameters play no significant role. For a
maximal mixing of Higgs bosons or at resonances, $g_s$ is applicable for the
perturbation theory at tree level. We also obtain the scattering cross section
of SFCDM off nucleons and compare our results with experiments which have
already reported data in this mass range; XENON100, LUX, COUPP and PICASSO
collaborations. Our results show that the SFCDM is excluded by these
experiments for choosing parameters which are consistent with perturbation
theory and relic abundance constraints.
| [
{
"created": "Tue, 10 Jun 2014 11:02:29 GMT",
"version": "v1"
},
{
"created": "Sun, 15 Jun 2014 12:45:32 GMT",
"version": "v2"
},
{
"created": "Fri, 10 Oct 2014 15:35:41 GMT",
"version": "v3"
}
] | 2015-06-19 | [
[
"Bagherian",
"Zohreh",
""
],
[
"Ettefaghi",
"Mohammad Mahdi",
""
],
[
"Haghgouyan",
"Zina",
""
],
[
"Moazzemi",
"Reza",
""
]
] | We consider the standard model (SM) extended by a gauge singlet fermion as cold dark matter (SFCDM) and a gauge singlet scalar (singlet Higgs) as a mediator. The parameter space of the SM is enlarged by seven new ones. We obtain the total annihilation cross section of singlet fermions to the SM particles and singlet Higgs at tree level. Regarding the relic abundance constraint obtained by WMAP observations, we study the dependency on each parameter separately, for dark matter masses up to 1 TeV. In particular, the coupling of SFCDM to singlet Higgs $g_s$, the SFCDM mass $m_\psi$, the second Higgs mass $m_{h_2}$, and the Higgs bosons mixing angel $\theta$ are investigated accurately. Three other parameters play no significant role. For a maximal mixing of Higgs bosons or at resonances, $g_s$ is applicable for the perturbation theory at tree level. We also obtain the scattering cross section of SFCDM off nucleons and compare our results with experiments which have already reported data in this mass range; XENON100, LUX, COUPP and PICASSO collaborations. Our results show that the SFCDM is excluded by these experiments for choosing parameters which are consistent with perturbation theory and relic abundance constraints. |
2010.05148 | Yao-Bei Liu | Yao-Bei Liu and Stefano Moretti | Probing tqZ anomalous couplings in the trilepton signal at the HL-LHC,
HE-LHC and FCC-hh | 21 pages, 6 figures, 8 tables, to appear in Chinese Physics C | null | 10.1088/1674-1137/abe0c0 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We investigate the prospects for discovering the Flavour Changing Neutral
Current (FCNC) $tqZ$ couplings via two production processes yielding trilepton
signals: top quark pair production $pp\to t\bar{t}$ with one top decaying to
the $Z$ boson and one light jet and the anomalous single top plus $Z$ boson
production process $pp\to tZ$. We study these channels at various successors of
the Large Hadron Collider~(LHC), i.e., the approved High-Luminosity LHC
(HL-LHC) as well as the proposed High-Energy LHC~(HE-LHC) and Future Circular
Collider in hadron-hadron mode (FCC-hh). We perform a full simulation for the
signals and the relevant Standard Model (SM) backgrounds and obtain limits on
the Branching Ratios (BRs) of $t\to qZ~(q=u,c)$, eventually yielding a
trilepton final state through the decay modes $t\to b W^{+}\to
b\ell^{+}\nu_{\ell}$ and $Z\to \ell^{+}\ell^{-}$. The upper limits on these
FCNC BRs at 95\% Confidence Level (CL) are obtained at the HL-LHC with $\sqrt
s=14$ TeV and 3 ab$^{-1}$, at the HE-LHC with $\sqrt s=27$ TeV and 15 ab$^{-1}$
as well as at the FCC-hh with $\sqrt s=100$ TeV and 30 ab$^{-1}$.
| [
{
"created": "Sun, 11 Oct 2020 03:25:41 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Jan 2021 08:37:55 GMT",
"version": "v2"
}
] | 2021-05-26 | [
[
"Liu",
"Yao-Bei",
""
],
[
"Moretti",
"Stefano",
""
]
] | We investigate the prospects for discovering the Flavour Changing Neutral Current (FCNC) $tqZ$ couplings via two production processes yielding trilepton signals: top quark pair production $pp\to t\bar{t}$ with one top decaying to the $Z$ boson and one light jet and the anomalous single top plus $Z$ boson production process $pp\to tZ$. We study these channels at various successors of the Large Hadron Collider~(LHC), i.e., the approved High-Luminosity LHC (HL-LHC) as well as the proposed High-Energy LHC~(HE-LHC) and Future Circular Collider in hadron-hadron mode (FCC-hh). We perform a full simulation for the signals and the relevant Standard Model (SM) backgrounds and obtain limits on the Branching Ratios (BRs) of $t\to qZ~(q=u,c)$, eventually yielding a trilepton final state through the decay modes $t\to b W^{+}\to b\ell^{+}\nu_{\ell}$ and $Z\to \ell^{+}\ell^{-}$. The upper limits on these FCNC BRs at 95\% Confidence Level (CL) are obtained at the HL-LHC with $\sqrt s=14$ TeV and 3 ab$^{-1}$, at the HE-LHC with $\sqrt s=27$ TeV and 15 ab$^{-1}$ as well as at the FCC-hh with $\sqrt s=100$ TeV and 30 ab$^{-1}$. |
hep-ph/9805423 | V. O. Galkin | D. Ebert, R. N. Faustov, V. O. Galkin | Exclusive semileptonic decays of B mesons to orbitally excited D mesons
in the relativistic quark model | 11 pages, Revtex, 4 figures, uses epsf and rotating.sty | Phys.Lett. B434 (1998) 365-372 | 10.1016/S0370-2693(98)00758-8 | HUB-EP-98/30 | hep-ph | null | Exclusive semileptonic B meson decays to orbitally excited D mesons are
investigated in the infinitely heavy quark limit in the framework of the
relativistic quark model based on the quasipotential approach. The B\to
D^{**}e\nu Isgur-Wise functions \tau_{3/2}(w) and \tau_{1/2}(w) are determined.
It is found that the relativistic transformation of the meson wave functions
(Wigner rotation of the light quark spin) contribute already at the leading
order of the heavy quark expansion.
| [
{
"created": "Fri, 22 May 1998 12:41:36 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Ebert",
"D.",
""
],
[
"Faustov",
"R. N.",
""
],
[
"Galkin",
"V. O.",
""
]
] | Exclusive semileptonic B meson decays to orbitally excited D mesons are investigated in the infinitely heavy quark limit in the framework of the relativistic quark model based on the quasipotential approach. The B\to D^{**}e\nu Isgur-Wise functions \tau_{3/2}(w) and \tau_{1/2}(w) are determined. It is found that the relativistic transformation of the meson wave functions (Wigner rotation of the light quark spin) contribute already at the leading order of the heavy quark expansion. |
hep-ph/0111341 | Anton Rebhan | A. Rebhan | Hard thermal loops and QCD thermodynamics | 26 pages, 3 figures. Lectures given at the NATO Advanced Study
Institute ``QCD perspectives on hot and dense matter'', August 6-18, 2001, in
Carg\`ese, Corsica, France | null | null | TUW-01-30 | hep-ph | null | These lectures give an introduction to thermal perturbation theory, hard
thermal loops, and their use in a nonperturbative, approximately
self-consistent resummation of the thermodynamical potentials of quantum
chromodynamics.
| [
{
"created": "Tue, 27 Nov 2001 16:55:27 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Rebhan",
"A.",
""
]
] | These lectures give an introduction to thermal perturbation theory, hard thermal loops, and their use in a nonperturbative, approximately self-consistent resummation of the thermodynamical potentials of quantum chromodynamics. |
1709.04542 | Alex Palameta | A. Palameta, J. Ho, D. Harnett, T. G. Steele | Heavy Quarkonium ($1^{--}$) Meson-Hybrid Mixing from QCD Sum Rules | QCD-17 conference proceedings article | null | 10.1016/j.nuclphysbps.2018.03.015 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use QCD Laplace sum-rules to explore mixing between conventional mesons
and hybrids in the heavy quarkonium vector $J^{PC}\!=\!1^{--}$ channel. Our
cross-correlator includes perturbation theory and contributions proportional to
the four-dimensional and six-dimensional gluon condensates. We input
experimentally determined charmonium and bottomonium hadron masses into both
single and multi-resonance models in order to test them for conventional meson
and hybrid components. In the charmonium sector we find evidence for
meson-hybrid mixing in the $J/\psi$ and a $\approx4.3$ GeV resonance. In the
bottomonium sector, we find that the $\Upsilon(1S)$, $\Upsilon(2S)$,
$\Upsilon(3S)$, and $\Upsilon(4S)$ all exhibit mixing.
| [
{
"created": "Wed, 13 Sep 2017 21:17:25 GMT",
"version": "v1"
}
] | 2018-09-03 | [
[
"Palameta",
"A.",
""
],
[
"Ho",
"J.",
""
],
[
"Harnett",
"D.",
""
],
[
"Steele",
"T. G.",
""
]
] | We use QCD Laplace sum-rules to explore mixing between conventional mesons and hybrids in the heavy quarkonium vector $J^{PC}\!=\!1^{--}$ channel. Our cross-correlator includes perturbation theory and contributions proportional to the four-dimensional and six-dimensional gluon condensates. We input experimentally determined charmonium and bottomonium hadron masses into both single and multi-resonance models in order to test them for conventional meson and hybrid components. In the charmonium sector we find evidence for meson-hybrid mixing in the $J/\psi$ and a $\approx4.3$ GeV resonance. In the bottomonium sector, we find that the $\Upsilon(1S)$, $\Upsilon(2S)$, $\Upsilon(3S)$, and $\Upsilon(4S)$ all exhibit mixing. |
hep-ph/0012208 | Yadong Yang | Mao-Zhi Yang (Hiroshima U. & IHEP, CAS), Ya-Dong Yang (Ochanomizu U. &
TECHNION) | Revisiting Charmless Two-Body B Decays involving $\eta^{\prime}$ and
$\eta$ | 34 pages, 5 figures. Title changed, text polished and some statements
softened | Nucl.Phys. B609 (2001) 469 | 10.1016/S0550-3213(01)00313-3 | OCHA-PP-166, HUPD-011 | hep-ph | null | We have studied charmless two-body B decays involving $\eta$ and $\eta'$ in
the framework of QCD improved factorization appraoch. The spectator hard
scattering mechanism for $\eta'$ production have been re-examined and extended,
which contributions are incorporated consistently into the factorizable leading
contributions. It is found that the conventional mechanism would give $Br(B\to
\eta' K)\sim 30\times 10^{-6}$ which agrees with predictions based on naive
factorization approaches. With the incorporation of spectator hard scattering
mechanism contributions, theoretical predictions are improved much and the bulk
of $Br(B\to \eta' K)$ are accommodated in the reasonable parameter space. We
have also presented calculations of $g^{\ast}g^{\ast}-\eta^{(\prime)}$
transition form factors within the standard hard scattering approach. It is
shown that the new contributions in the modes such as $B\to \eta' +vector$ and
$B\to \eta+ \pi, \rho, K^{(\ast)}$ are small. Direct CP-violation in those
decay modes are predicted. It is shown that the prospects for measuring direct
CP-violation effects in $B^{\pm} \to$ $\eta' K^{\pm}$, $\eta' \pi^{\pm}$, $\eta
\pi^{\pm}$, and $\eta K^{\pm}$ are promising at B factories in the near future.
| [
{
"created": "Sun, 17 Dec 2000 18:30:28 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Jan 2001 17:54:26 GMT",
"version": "v2"
},
{
"created": "Sun, 13 May 2001 15:22:27 GMT",
"version": "v3"
}
] | 2009-10-31 | [
[
"Yang",
"Mao-Zhi",
"",
"Hiroshima U. & IHEP, CAS"
],
[
"Yang",
"Ya-Dong",
"",
"Ochanomizu U. &\n TECHNION"
]
] | We have studied charmless two-body B decays involving $\eta$ and $\eta'$ in the framework of QCD improved factorization appraoch. The spectator hard scattering mechanism for $\eta'$ production have been re-examined and extended, which contributions are incorporated consistently into the factorizable leading contributions. It is found that the conventional mechanism would give $Br(B\to \eta' K)\sim 30\times 10^{-6}$ which agrees with predictions based on naive factorization approaches. With the incorporation of spectator hard scattering mechanism contributions, theoretical predictions are improved much and the bulk of $Br(B\to \eta' K)$ are accommodated in the reasonable parameter space. We have also presented calculations of $g^{\ast}g^{\ast}-\eta^{(\prime)}$ transition form factors within the standard hard scattering approach. It is shown that the new contributions in the modes such as $B\to \eta' +vector$ and $B\to \eta+ \pi, \rho, K^{(\ast)}$ are small. Direct CP-violation in those decay modes are predicted. It is shown that the prospects for measuring direct CP-violation effects in $B^{\pm} \to$ $\eta' K^{\pm}$, $\eta' \pi^{\pm}$, $\eta \pi^{\pm}$, and $\eta K^{\pm}$ are promising at B factories in the near future. |
1901.09076 | Anna Stasto | Nestor Armesto, Paul R. Newman, Wojciech Slominski, Anna M. Stasto | Inclusive diffraction in future electron-proton and electron-ion
colliders | 24 pages, 16 figures | Phys. Rev. D 100, 074022 (2019) | 10.1103/PhysRevD.100.074022 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyse the possibilities for the study of inclusive diffraction offered
by future electron--proton/nucleus colliders in the TeV regime, the Large
Hadron-electron Collider as an upgrade of the HL-LHC and the Future Circular
Collider in electron-hadron mode. Compared to $ep$ collisions at HERA, we find
an extension of the available kinematic range in $x$ by a factor of order $20$
and of the maximum $Q^2$ by a factor of order $100$ for LHeC, while the FCC
version would extend the coverage by a further order of magnitude both in $x$
and $Q^2$. This translates into a range of available momentum fraction of the
diffractive exchange with respect to the hadron ($\xi$), down to
$10^{-4}-10^{-5}$ for a wide range of the momentum fraction of the parton with
respect to the diffractive exchange ($\beta$). Using the same framework and
methodology employed in previous studies at HERA, considering only the
experimental uncertainties and not those stemming from the functional form of
the initial conditions or other ones of theoretical origin, and under very
conservative assumptions for the luminosities and systematic errors, we find an
improvement in the extraction of diffractive parton densities from fits to
reduced cross sections for inclusive coherent diffraction in $ep$ by about an
order of magnitude. For $eA$, we also perform the simulations for the Electron
Ion Collider. We find that an extraction of the currently unmeasured nuclear
diffractive parton densities is possible with similar accuracy to that in $ep$.
| [
{
"created": "Fri, 25 Jan 2019 20:40:11 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Aug 2020 22:14:40 GMT",
"version": "v2"
}
] | 2020-08-12 | [
[
"Armesto",
"Nestor",
""
],
[
"Newman",
"Paul R.",
""
],
[
"Slominski",
"Wojciech",
""
],
[
"Stasto",
"Anna M.",
""
]
] | We analyse the possibilities for the study of inclusive diffraction offered by future electron--proton/nucleus colliders in the TeV regime, the Large Hadron-electron Collider as an upgrade of the HL-LHC and the Future Circular Collider in electron-hadron mode. Compared to $ep$ collisions at HERA, we find an extension of the available kinematic range in $x$ by a factor of order $20$ and of the maximum $Q^2$ by a factor of order $100$ for LHeC, while the FCC version would extend the coverage by a further order of magnitude both in $x$ and $Q^2$. This translates into a range of available momentum fraction of the diffractive exchange with respect to the hadron ($\xi$), down to $10^{-4}-10^{-5}$ for a wide range of the momentum fraction of the parton with respect to the diffractive exchange ($\beta$). Using the same framework and methodology employed in previous studies at HERA, considering only the experimental uncertainties and not those stemming from the functional form of the initial conditions or other ones of theoretical origin, and under very conservative assumptions for the luminosities and systematic errors, we find an improvement in the extraction of diffractive parton densities from fits to reduced cross sections for inclusive coherent diffraction in $ep$ by about an order of magnitude. For $eA$, we also perform the simulations for the Electron Ion Collider. We find that an extraction of the currently unmeasured nuclear diffractive parton densities is possible with similar accuracy to that in $ep$. |
1804.01043 | Giulia Pancheri Dr. | Giulia Pancheri and Yogendra. N. Srivastava | A Democratic Resummation Procedure of Soft Gluon Emission for Hadronic
Inelastic Cross-sections and Survival Probabilities | 6 pages, 6 figures, to appear in the Proceedings of LFC17: Old and
New Strong Interactions from LHC to Future Colliders, ECT*, Trento, 11-15
September 2017 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss a model for soft gluon re-summation based on a statistical
description of independent emissions during inelastic collisions. The model is
applied to estimate Survival Probabilities at the LHC. A comparison with other
models and experimental data is presented.
| [
{
"created": "Tue, 3 Apr 2018 15:43:43 GMT",
"version": "v1"
}
] | 2018-04-04 | [
[
"Pancheri",
"Giulia",
""
],
[
"Srivastava",
"Yogendra. N.",
""
]
] | We discuss a model for soft gluon re-summation based on a statistical description of independent emissions during inelastic collisions. The model is applied to estimate Survival Probabilities at the LHC. A comparison with other models and experimental data is presented. |
1003.3033 | Stephen Godfrey | Stephen Godfrey (Carleton U. and TRIUMF) and Ken Moats (Carleton U) | Exploring Higgs Triplet Models via Vector Boson Scattering at the LHC | 14 pages, 11 figures, references added | Phys.Rev.D81:075026,2010 | 10.1103/PhysRevD.81.075026 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the results of a study of Higgs triplet boson production arising
in the Littlest Higgs, Left-Right Symmetric, and Georgi-Machacek models in the
W^\pm W^\pm, W^\pm Z, W^+ W^-, and Z Z channels at the LHC. We focus on the
"gold-plated" purely leptonic decay modes and consider the irreducible
electroweak, QCD, and t-quark backgrounds, applying a combination of
forward-jet-tagging, central-jet-vetoing, and stringent leptonic cuts to
suppress the backgrounds. We find that, given the constraints on the triplet
vacuum expectation value (vev), considerable luminosity is required to observe
Higgs triplet bosons in vector boson scattering. Observing a Higgs triplet at
the LHC is most promising in the Georgi-Machacek model due to a weaker
constraint on the triplet vev. In this model, we find that a Higgs triplet
boson with a mass of 1.0 (1.5) TeV can be observed at the LHC with an
integrated luminosity as low as 41 (119) fb^{-1} in the W^\pm W^\pm channel and
as low as 171 (474) fb^{-1} in the W^\pm Z channel. Observation of Higgs
triplet bosons in these channels would help identify the underlying theory.
| [
{
"created": "Mon, 15 Mar 2010 21:01:22 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Mar 2010 00:26:47 GMT",
"version": "v2"
},
{
"created": "Tue, 13 Apr 2010 23:57:54 GMT",
"version": "v3"
}
] | 2015-03-13 | [
[
"Godfrey",
"Stephen",
"",
"Carleton U. and TRIUMF"
],
[
"Moats",
"Ken",
"",
"Carleton U"
]
] | We present the results of a study of Higgs triplet boson production arising in the Littlest Higgs, Left-Right Symmetric, and Georgi-Machacek models in the W^\pm W^\pm, W^\pm Z, W^+ W^-, and Z Z channels at the LHC. We focus on the "gold-plated" purely leptonic decay modes and consider the irreducible electroweak, QCD, and t-quark backgrounds, applying a combination of forward-jet-tagging, central-jet-vetoing, and stringent leptonic cuts to suppress the backgrounds. We find that, given the constraints on the triplet vacuum expectation value (vev), considerable luminosity is required to observe Higgs triplet bosons in vector boson scattering. Observing a Higgs triplet at the LHC is most promising in the Georgi-Machacek model due to a weaker constraint on the triplet vev. In this model, we find that a Higgs triplet boson with a mass of 1.0 (1.5) TeV can be observed at the LHC with an integrated luminosity as low as 41 (119) fb^{-1} in the W^\pm W^\pm channel and as low as 171 (474) fb^{-1} in the W^\pm Z channel. Observation of Higgs triplet bosons in these channels would help identify the underlying theory. |
hep-ph/0204182 | Brigitte Hiller | Alexander A. Osipov and Brigitte Hiller | Path integral bosonization of the 't Hooft determinant: fluctuations and
multiple vacua | RevTex, 9 pages, 8 figures, slightly modified introduction, one added
reference and added acknowledgements, version accepted in Phys. Lett. B | Phys.Lett. B539 (2002) 76-84 | 10.1016/S0370-2693(02)02041-5 | null | hep-ph | null | The 't Hooft six quark flavor mixing interaction (N_f=3) is bosonized by the
path integral method. The considered complete Lagrangian is constructed on the
basis of the combined 't Hooft and U(3)X U(3) extended chiral four fermion
Nambu-Jona-Lasinio interactions. The method of the steepest descents is used to
derive the effective mesonic Lagrangian. Additionally to the known lowest order
stationary phase (SP) result of Reinhardt and Alkofer we obtain the
contribution from the small quantum fluctuations of bosonic configurations
around their stationary phase trajectories. It affects the vacuum state of
hadrons at low energies: whereas without the inclusion of quantum fluctuations
the vacuum is uniquely defined for a fixed set of the model parameters,
fluctuations give rise to multivalued solutions of the gap equations, marked at
instances by drastic changes in the quark condensates. We derive the new gap
equations and analyse them in comparison with known results. We classify the
solutions according to the number of extrema they may accomodate. We find up to
four solutions in the 0<m_(u,s)<3$ GeV region.
| [
{
"created": "Tue, 16 Apr 2002 09:46:14 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Jun 2002 09:36:37 GMT",
"version": "v2"
}
] | 2015-06-25 | [
[
"Osipov",
"Alexander A.",
""
],
[
"Hiller",
"Brigitte",
""
]
] | The 't Hooft six quark flavor mixing interaction (N_f=3) is bosonized by the path integral method. The considered complete Lagrangian is constructed on the basis of the combined 't Hooft and U(3)X U(3) extended chiral four fermion Nambu-Jona-Lasinio interactions. The method of the steepest descents is used to derive the effective mesonic Lagrangian. Additionally to the known lowest order stationary phase (SP) result of Reinhardt and Alkofer we obtain the contribution from the small quantum fluctuations of bosonic configurations around their stationary phase trajectories. It affects the vacuum state of hadrons at low energies: whereas without the inclusion of quantum fluctuations the vacuum is uniquely defined for a fixed set of the model parameters, fluctuations give rise to multivalued solutions of the gap equations, marked at instances by drastic changes in the quark condensates. We derive the new gap equations and analyse them in comparison with known results. We classify the solutions according to the number of extrema they may accomodate. We find up to four solutions in the 0<m_(u,s)<3$ GeV region. |
hep-ph/0401010 | Steven Weinberg | Steven Weinberg | The Making of the Standard Model | 21 pages | Eur.Phys.J.C34:5-13,2004 | 10.1140/epjc/s2004-01761-1 | null | hep-ph | null | This is the edited text of a talk given at CERN on Septembr 16, 2003, as part
of a celebration of the 30th anniversary of the discovery of neutral currents
and the 20th anniversary of the discovery of the W and Z particles.
| [
{
"created": "Sat, 3 Jan 2004 03:04:20 GMT",
"version": "v1"
}
] | 2009-03-02 | [
[
"Weinberg",
"Steven",
""
]
] | This is the edited text of a talk given at CERN on Septembr 16, 2003, as part of a celebration of the 30th anniversary of the discovery of neutral currents and the 20th anniversary of the discovery of the W and Z particles. |
1501.03496 | Asher Berlin | Asher Berlin, Anthony DiFranzo, and Dan Hooper | A 3.55 keV Line from Exciting Dark Matter without a Hidden Sector | null | Phys. Rev. D 91, 075018 (2015) | 10.1103/PhysRevD.91.075018 | FERMILAB-PUB-15-009-A | hep-ph astro-ph.CO astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Models in which dark matter particles can scatter into a slightly heavier
state which promptly decays to the lighter state and a photon (known as
eXciting Dark Matter, or XDM) have been shown to be capable of generating the
3.55 keV line observed from galaxy clusters, while suppressing the flux of such
a line from smaller halos, including dwarf galaxies. In most of the XDM models
discussed in the literature, this up-scattering is mediated by a new light
particle, and dark matter annihilations proceed into pairs of this same light
state. In these models, the dark matter and mediator effectively reside within
a hidden sector, without sizable couplings to the Standard Model. In this
paper, we explore a model of XDM that does not include a hidden sector.
Instead, the dark matter both up-scatters and annihilates through the near
resonant exchange of a $\mathcal{O}(10^2)$ GeV pseudoscalar with large Yukawa
couplings to the dark matter and smaller, but non-neglibile, couplings to
Standard Model fermions. The dark matter and the mediator are each mixtures of
Standard Model singlets and $SU(2)_W$ doublets. We identify parameter space in
which this model can simultaneously generate the 3.55 keV line and the
gamma-ray excess observed from the Galactic Center, without conflicting with
constraints from colliders, direct detection experiments, or observations of
dwarf galaxies.
| [
{
"created": "Wed, 14 Jan 2015 21:00:12 GMT",
"version": "v1"
}
] | 2015-04-29 | [
[
"Berlin",
"Asher",
""
],
[
"DiFranzo",
"Anthony",
""
],
[
"Hooper",
"Dan",
""
]
] | Models in which dark matter particles can scatter into a slightly heavier state which promptly decays to the lighter state and a photon (known as eXciting Dark Matter, or XDM) have been shown to be capable of generating the 3.55 keV line observed from galaxy clusters, while suppressing the flux of such a line from smaller halos, including dwarf galaxies. In most of the XDM models discussed in the literature, this up-scattering is mediated by a new light particle, and dark matter annihilations proceed into pairs of this same light state. In these models, the dark matter and mediator effectively reside within a hidden sector, without sizable couplings to the Standard Model. In this paper, we explore a model of XDM that does not include a hidden sector. Instead, the dark matter both up-scatters and annihilates through the near resonant exchange of a $\mathcal{O}(10^2)$ GeV pseudoscalar with large Yukawa couplings to the dark matter and smaller, but non-neglibile, couplings to Standard Model fermions. The dark matter and the mediator are each mixtures of Standard Model singlets and $SU(2)_W$ doublets. We identify parameter space in which this model can simultaneously generate the 3.55 keV line and the gamma-ray excess observed from the Galactic Center, without conflicting with constraints from colliders, direct detection experiments, or observations of dwarf galaxies. |
2102.08601 | Irinel Caprini | Irinel Caprini | Analyticity and Regge asymptotics in virtual Compton scattering on the
nucleon | v2, minor changes, version accepted by EPJC | null | 10.1140/epjc/s10052-021-09095-8 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We test the consistency of the data on the nucleon structure functions with
analyticity and the Regge asymptotics of the virtual Compton amplitude. By
solving a functional extremal problem, we derive an optimal lower bound on the
maximum difference between the exact amplitude and the dominant Reggeon
contribution for energies $\nu$ above a certain high value $\nu_h(Q^2)$.
Considering in particular the difference of the amplitudes $T_1^\inel(\nu,
Q^2)$ for the proton and neutron, we find that the lower bound decreases in an
impressive way when $\nu_h(Q^2)$ is increased, and represents a very small
fraction of the magnitude of the dominant Reggeon. While the method cannot rule
out the hypothesis of a fixed Regge pole, the results indicate that the data on
the structure function are consistent with an asymptotic behaviour given by
leading Reggeon contributions. We also show that the minimum of the lower bound
as a function of the subtraction constant $S_1^\inel(Q^2)$ provides a
reasonable estimate of this quantity, in a frame similar, but not identical to
the Reggeon dominance hypothesis.
| [
{
"created": "Wed, 17 Feb 2021 06:30:01 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Mar 2021 07:44:32 GMT",
"version": "v2"
}
] | 2021-04-28 | [
[
"Caprini",
"Irinel",
""
]
] | We test the consistency of the data on the nucleon structure functions with analyticity and the Regge asymptotics of the virtual Compton amplitude. By solving a functional extremal problem, we derive an optimal lower bound on the maximum difference between the exact amplitude and the dominant Reggeon contribution for energies $\nu$ above a certain high value $\nu_h(Q^2)$. Considering in particular the difference of the amplitudes $T_1^\inel(\nu, Q^2)$ for the proton and neutron, we find that the lower bound decreases in an impressive way when $\nu_h(Q^2)$ is increased, and represents a very small fraction of the magnitude of the dominant Reggeon. While the method cannot rule out the hypothesis of a fixed Regge pole, the results indicate that the data on the structure function are consistent with an asymptotic behaviour given by leading Reggeon contributions. We also show that the minimum of the lower bound as a function of the subtraction constant $S_1^\inel(Q^2)$ provides a reasonable estimate of this quantity, in a frame similar, but not identical to the Reggeon dominance hypothesis. |
1809.06240 | Dmitry Chicherin | D. Chicherin, T. Gehrmann, J. M. Henn, N. A. Lo Presti, V. Mitev, P.
Wasser | Analytic result for the nonplanar hexa-box integrals | 22 pages, 4 figures, 3 ancillary files, published in JHEP | null | 10.1007/JHEP03(2019)042 | ZU-TH 35/18, MPP-2018-220, MITP/18-084, IPPP/18/75 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we analytically compute all master integrals for one of the
two non-planar integral families for five-particle massless scattering at two
loops. We first derive an integral basis of 73 integrals with constant leading
singularities. We then construct the system of differential equations satisfied
by them, and find that it is in canonical form. The solution space is in
agreement with a recent conjecture for the non-planar pentagon alphabet. We fix
the boundary constants of the differential equations by exploiting constraints
from the absence of unphysical singularities. The solution of the differential
equations in the Euclidean region is expressed in terms of iterated integrals.
We cross-check the latter against previously known results in the literature,
as well as with independent Mellin-Barnes calculations.
| [
{
"created": "Mon, 17 Sep 2018 14:29:22 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Mar 2019 18:31:27 GMT",
"version": "v2"
}
] | 2019-03-18 | [
[
"Chicherin",
"D.",
""
],
[
"Gehrmann",
"T.",
""
],
[
"Henn",
"J. M.",
""
],
[
"Presti",
"N. A. Lo",
""
],
[
"Mitev",
"V.",
""
],
[
"Wasser",
"P.",
""
]
] | In this paper, we analytically compute all master integrals for one of the two non-planar integral families for five-particle massless scattering at two loops. We first derive an integral basis of 73 integrals with constant leading singularities. We then construct the system of differential equations satisfied by them, and find that it is in canonical form. The solution space is in agreement with a recent conjecture for the non-planar pentagon alphabet. We fix the boundary constants of the differential equations by exploiting constraints from the absence of unphysical singularities. The solution of the differential equations in the Euclidean region is expressed in terms of iterated integrals. We cross-check the latter against previously known results in the literature, as well as with independent Mellin-Barnes calculations. |
0909.3974 | Micha{\l} Silarski | M. Silarski, P. Moskal, E. Czerwinski, R. Czyzykiewicz, D. Gil, D.
Grzonka, L. Jarczyk, B. Kamys, A. Khoukaz, J. Klaja, P. Klaja, W. Krzemien,
W. Oelert, J. Ritman, T. Sefzick, M. Siemaszko, J. Smyrski, A. Taschner, P.
Winter, M. Wolke, P. Wustner, M. Zielinski, W. Zipper, J. Zdebik | Generalized Dalitz Plot analysis of the near threshold pp-->ppK+K-
reaction in view of the K+K- final state interaction | 8 pages, 7 figures, to be published in Phys. Rev. C | Phys.Rev.C80:045202,2009 | 10.1103/PhysRevC.80.045202 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The excitation function for the $pp\to ppK^+K^-$ reaction revealed a
significant enhancement close to threshold which may plausibly be assigned to
the influence of the $pK^-$ and $K^+K^-$ final state interactions. In an
improved reanalysis of COSY-11 data for the $pp\to ppK^+K^-$ reaction at excess
energies of Q = 10 MeV and 28 MeV including the proton-K- interaction the
enhancement is confirmed. Invariant mass distributions for the two- and
three-particle subsystems allow to test at low excess energies the ansatz and
parameters for the description of the interaction in the ppK+K- system as
derived from the COSY-ANKE data. Finally, based for the first time on the low
energy K+K- invariant mass distributions and the generalized Dalitz plot
analysis, we estimate the scattering length for the K+K- interaction to be
|Re(a_K^+K^-)| = 0.5 + 4.0 -0.5 fm and Im(a_K^+K^-) = 3.0 +- 3.0 fm.
| [
{
"created": "Tue, 22 Sep 2009 12:07:32 GMT",
"version": "v1"
}
] | 2009-11-06 | [
[
"Silarski",
"M.",
""
],
[
"Moskal",
"P.",
""
],
[
"Czerwinski",
"E.",
""
],
[
"Czyzykiewicz",
"R.",
""
],
[
"Gil",
"D.",
""
],
[
"Grzonka",
"D.",
""
],
[
"Jarczyk",
"L.",
""
],
[
"Kamys",
"B.",
... | The excitation function for the $pp\to ppK^+K^-$ reaction revealed a significant enhancement close to threshold which may plausibly be assigned to the influence of the $pK^-$ and $K^+K^-$ final state interactions. In an improved reanalysis of COSY-11 data for the $pp\to ppK^+K^-$ reaction at excess energies of Q = 10 MeV and 28 MeV including the proton-K- interaction the enhancement is confirmed. Invariant mass distributions for the two- and three-particle subsystems allow to test at low excess energies the ansatz and parameters for the description of the interaction in the ppK+K- system as derived from the COSY-ANKE data. Finally, based for the first time on the low energy K+K- invariant mass distributions and the generalized Dalitz plot analysis, we estimate the scattering length for the K+K- interaction to be |Re(a_K^+K^-)| = 0.5 + 4.0 -0.5 fm and Im(a_K^+K^-) = 3.0 +- 3.0 fm. |
hep-ph/9209249 | Patrick O'Donnell | Patrick J. O'Donnell and Humphrey K.K. Tung | Exclusive Rare Decay $B\rightarrow K^{\ast}\gamma$ | 7 pages, UTPT-92-12, IP-ASTP-14, REVTEX | null | null | null | hep-ph | null | We show that the exclusive decay $B\rightarrow K^{\ast}\gamma$ can be related
to the semileptonic decay $B\rightarrow\rho e\bar{\nu}$ using heavy-quark
symmetry and $SU(3)$ flavor symmetry. A direct measurement of the
$q^{2}$-spectrum for the semileptonic decay can provide relevant information
for the exclusive rare decay.
| [
{
"created": "Thu, 17 Sep 1992 15:23:09 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"O'Donnell",
"Patrick J.",
""
],
[
"Tung",
"Humphrey K. K.",
""
]
] | We show that the exclusive decay $B\rightarrow K^{\ast}\gamma$ can be related to the semileptonic decay $B\rightarrow\rho e\bar{\nu}$ using heavy-quark symmetry and $SU(3)$ flavor symmetry. A direct measurement of the $q^{2}$-spectrum for the semileptonic decay can provide relevant information for the exclusive rare decay. |
hep-ph/0006337 | Robert Buras | K.Boecker (MPP Munich) | Impact of Hadronic Axions on Black Hole Accretion Discs and Neutron
Stars | Masters Thesis (TU Munich), 63 pp | null | null | null | hep-ph astro-ph | null | We re-examine the possibility of an astrophysically allowed KSVZ-type axion
that has a strongly suppressed coupling to photons. We then investigate the
impact of such ''hadronic axions'' on two classes of astrophysical objects:
black hole accretion disc (BHAD) based gamma-ray bursts and isolated
neutron-stars. Although our results are sensitive to details of the underlying
models, we show that hadronic axions could in principle play an important role
in the evolution of gamma-ray bursts and in the cooling behaviour of neutron
stars.
| [
{
"created": "Thu, 29 Jun 2000 14:01:34 GMT",
"version": "v1"
}
] | 2016-09-06 | [
[
"Boecker",
"K.",
"",
"MPP Munich"
]
] | We re-examine the possibility of an astrophysically allowed KSVZ-type axion that has a strongly suppressed coupling to photons. We then investigate the impact of such ''hadronic axions'' on two classes of astrophysical objects: black hole accretion disc (BHAD) based gamma-ray bursts and isolated neutron-stars. Although our results are sensitive to details of the underlying models, we show that hadronic axions could in principle play an important role in the evolution of gamma-ray bursts and in the cooling behaviour of neutron stars. |
2004.05095 | Gregory L. Johnson | Andrew Connelly, Gregory Johnson, Swagato Mukherjee, Vladimir Skokov | Universality driven analytic structure of QCD crossover: radius of
convergence and QCD critical point | Quark Matter 2019 Conference Proceedings; Submitted to Nuclear
Physics A | null | 10.1016/j.nuclphysa.2020.121834 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent lattice QCD calculations show strong indications that the crossover of
QCD at zero baryon chemical potential ($\mu_B$) is a remnant of the second
order chiral phase transition. The non-universal parameters needed to map
temperature $T$ and $\mu_B$ to the universal properties of the second order
chiral phase transition were determined by lattice QCD calculations. Motivated
by these advances, first, we discuss the analytic structure of the partition
function -- the so-called Yang-Lee edge singularity -- in the QCD crossover
regime, solely based on universal properties. Then, utilizing the lattice
calculated non-universal parameters, we map this singularity to the real $T$
and complex $\mu_B$ plane, in order to find the radius of convergence for a
Taylor series expansion of QCD partition function around $\mu_B=0$ in the QCD
crossover regime. Our most important findings are: (i) An universality-based
estimate of the radius of convergence around $\mu_B=0$; (ii) Universality and
lattice QCD based constraints on the location of the QCD critical point in the
$T-\mu_B$ plane.
| [
{
"created": "Fri, 10 Apr 2020 16:26:48 GMT",
"version": "v1"
}
] | 2021-02-03 | [
[
"Connelly",
"Andrew",
""
],
[
"Johnson",
"Gregory",
""
],
[
"Mukherjee",
"Swagato",
""
],
[
"Skokov",
"Vladimir",
""
]
] | Recent lattice QCD calculations show strong indications that the crossover of QCD at zero baryon chemical potential ($\mu_B$) is a remnant of the second order chiral phase transition. The non-universal parameters needed to map temperature $T$ and $\mu_B$ to the universal properties of the second order chiral phase transition were determined by lattice QCD calculations. Motivated by these advances, first, we discuss the analytic structure of the partition function -- the so-called Yang-Lee edge singularity -- in the QCD crossover regime, solely based on universal properties. Then, utilizing the lattice calculated non-universal parameters, we map this singularity to the real $T$ and complex $\mu_B$ plane, in order to find the radius of convergence for a Taylor series expansion of QCD partition function around $\mu_B=0$ in the QCD crossover regime. Our most important findings are: (i) An universality-based estimate of the radius of convergence around $\mu_B=0$; (ii) Universality and lattice QCD based constraints on the location of the QCD critical point in the $T-\mu_B$ plane. |
hep-ph/9901295 | Guanghua Xu | Guanghua Xu | Studies of the Vector-Meson Mass Generation Scheme by Chiral Anomalies
in two-Dimensional non-Abelian Gauge Theories | 10 pages | null | null | null | hep-ph | null | Higher order effects of the two-dimensional non-Abelian gauge theories, in
which the vector-meson mass is generated by chiral anomalies, will be studied.
The $\beta$ function and the topological nature of the non-linear $\sigma$
model in the action and unitarity of the theory will be discussed.
| [
{
"created": "Wed, 13 Jan 1999 19:13:58 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Xu",
"Guanghua",
""
]
] | Higher order effects of the two-dimensional non-Abelian gauge theories, in which the vector-meson mass is generated by chiral anomalies, will be studied. The $\beta$ function and the topological nature of the non-linear $\sigma$ model in the action and unitarity of the theory will be discussed. |
hep-ph/9708259 | Mikhail Dubinin | M. N. Dubinin (Moscow Univ., INP), H. S. Song (Seoul Univ., CTP) | Anomalous W boson production at HERA | 25 pages, LaTeX, 2 figures LaTeX, 6 figures .ps, uses axodraw.sty | Phys.Rev.D57:2927-2939,1998 | 10.1103/PhysRevD.57.2927 | null | hep-ph | null | We present the results of complete tree level calculation for W boson
production processes e^- p -> e^- mu^+ nu_mu X and e^- p -> e^- mu^- nu_mubar X
introducing anomalous WWgamma and WWZ couplings. Detailed results for the
distributions of final state particles are obtained. In the region of small
momentum transferred we calculate the contribution of hadronlike photon
component in the structure function approach.
| [
{
"created": "Wed, 6 Aug 1997 14:55:04 GMT",
"version": "v1"
}
] | 2011-07-19 | [
[
"Dubinin",
"M. N.",
"",
"Moscow Univ., INP"
],
[
"Song",
"H. S.",
"",
"Seoul Univ., CTP"
]
] | We present the results of complete tree level calculation for W boson production processes e^- p -> e^- mu^+ nu_mu X and e^- p -> e^- mu^- nu_mubar X introducing anomalous WWgamma and WWZ couplings. Detailed results for the distributions of final state particles are obtained. In the region of small momentum transferred we calculate the contribution of hadronlike photon component in the structure function approach. |
hep-ph/9502214 | null | Yoonbai Kim, Sho Tsujimaru and Koichi Yamawaki | Can the Nambu-Goldstone Boson Live on the Light-Front? | 11pages, Latex file | Phys.Rev.Lett. 74 (1995) 4771-4774; Erratum-ibid. 75 (1995) 2632 | 10.1103/PhysRevLett.75.2632 | DPNU-94-56, INS-rep.-1075 | hep-ph hep-lat hep-th | null | We show that the Nambu-Goldstone(NG) boson restricted on the light-front(LF)
can only exist if we regularize the theory by introducing the explicit breaking
NG-boson mass $m_{\pi}$. The NG-boson zero mode, when integrated over the LF,
must have a singular behavior $\sim 1/m^2_{\pi}$ in the symmetric limit of
$m^2_{\pi}\rightarrow 0$. In the discretized LF quantization this peculiarity
is clarified in terms of the zero-mode constraints in the linear $\sigma$
model. The LF charge annihilates the vacuum, while it is not conserved in the
symmetric limit in the NG phase.
| [
{
"created": "Thu, 2 Feb 1995 07:34:00 GMT",
"version": "v1"
}
] | 2016-09-01 | [
[
"Kim",
"Yoonbai",
""
],
[
"Tsujimaru",
"Sho",
""
],
[
"Yamawaki",
"Koichi",
""
]
] | We show that the Nambu-Goldstone(NG) boson restricted on the light-front(LF) can only exist if we regularize the theory by introducing the explicit breaking NG-boson mass $m_{\pi}$. The NG-boson zero mode, when integrated over the LF, must have a singular behavior $\sim 1/m^2_{\pi}$ in the symmetric limit of $m^2_{\pi}\rightarrow 0$. In the discretized LF quantization this peculiarity is clarified in terms of the zero-mode constraints in the linear $\sigma$ model. The LF charge annihilates the vacuum, while it is not conserved in the symmetric limit in the NG phase. |
hep-ph/0608258 | Alexander Kovner | A. Kovner, M. Lublinsky and H. Weigert | Treading on the cut: Semi inclusive observables at high energy | 37 pages, 3 figures. A few remarks added. To appear in PRD | Phys.Rev.D74:114023,2006 | 10.1103/PhysRevD.74.114023 | null | hep-ph | null | We develop the formalizm for calculating semi inclusive observables at high
energy in the JIMWLK/KLWMIJ approach. We consider several examples including
diffractive processes, elastic and inclusive over the target degrees of
freedom, scattering with fixed total transverse momentum transfer and inclusive
gluon production. We discuss evolution of these observables with respect to
various rapidity variables involved in their definitions (total rapidity,
rapidity gap, width of diffractive interval etc.). We also discuss the dipole
model limit of these observables and derive closed simple (as opposed to
functional) differential equations in this approximation. We point out that
there are some interesting differences between the full JIMWLK/KLWMIJ evolution
and the dipole model evolution of diffractive cross section. In particular we
show that in the dipole approximation the target does not diffract beyond the
valence rapidity interval, consistently with the intuition suggested by the
Pomeron fan diagramms. On the other hand such diffractive processes do exist in
the full JIMWLK/KLWMIJ approach, albeit suppressed by the factor 1/N_c^2.
| [
{
"created": "Wed, 23 Aug 2006 19:41:55 GMT",
"version": "v1"
},
{
"created": "Sat, 25 Nov 2006 21:22:00 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Kovner",
"A.",
""
],
[
"Lublinsky",
"M.",
""
],
[
"Weigert",
"H.",
""
]
] | We develop the formalizm for calculating semi inclusive observables at high energy in the JIMWLK/KLWMIJ approach. We consider several examples including diffractive processes, elastic and inclusive over the target degrees of freedom, scattering with fixed total transverse momentum transfer and inclusive gluon production. We discuss evolution of these observables with respect to various rapidity variables involved in their definitions (total rapidity, rapidity gap, width of diffractive interval etc.). We also discuss the dipole model limit of these observables and derive closed simple (as opposed to functional) differential equations in this approximation. We point out that there are some interesting differences between the full JIMWLK/KLWMIJ evolution and the dipole model evolution of diffractive cross section. In particular we show that in the dipole approximation the target does not diffract beyond the valence rapidity interval, consistently with the intuition suggested by the Pomeron fan diagramms. On the other hand such diffractive processes do exist in the full JIMWLK/KLWMIJ approach, albeit suppressed by the factor 1/N_c^2. |
hep-ph/9712294 | Vladimir Baryshevsky | V. G. Baryshevsky (Nuclear Problems Institute, Minsk, Belarus) | The phenomena of the time-violating photon polarization plane and
neutron spin rotation by a diffraction grating. New methods of measuring of
the time-violating interactions | 19 pages, uses article.sty | JHEP 9804:018,1998 | 10.1088/1126-6708/1998/04/018 | null | hep-ph | null | It is shown, that the new phenomena of the T-violating photon polarization
plane and neutron spin rotation appear under diffraction in a
noncentrosymmetrical diffraction grating. The equations describing the
T-violating photon scattering by a diffraction grating and neutron interaction
with noncentrosymmetrical crystal have been obtained. These phenomena may be
used for time-violating interactions investigation.
| [
{
"created": "Mon, 8 Dec 1997 11:32:32 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Baryshevsky",
"V. G.",
"",
"Nuclear Problems Institute, Minsk, Belarus"
]
] | It is shown, that the new phenomena of the T-violating photon polarization plane and neutron spin rotation appear under diffraction in a noncentrosymmetrical diffraction grating. The equations describing the T-violating photon scattering by a diffraction grating and neutron interaction with noncentrosymmetrical crystal have been obtained. These phenomena may be used for time-violating interactions investigation. |
hep-ph/0612168 | Krishna Rajagopal | Hong Liu (MIT), Krishna Rajagopal (MIT), Urs Achim Wiedemann (CERN) | Wilson loops in heavy ion collisions and their calculation in AdS/CFT | 61 pages, 8 figures. Note added discussing relation between our work
and that in several papers that have appeared recently. References added | JHEP 0703:066,2007 | 10.1088/1126-6708/2007/03/066 | MIT-CTP-3794, CERN-PH-TH/2006-257 | hep-ph hep-th nucl-th | null | Expectation values of Wilson loops define the nonperturbative properties of
the hot medium produced in heavy ion collisions that arise in the analysis of
both radiative parton energy loss and quarkonium suppression. We use the
AdS/CFT correspondence to calculate the expectation values of such Wilson loops
in the strongly coupled plasma of N=4 super Yang-Mills (SYM) theory, allowing
for the possibility that the plasma may be moving with some collective flow
velocity as is the case in heavy ion collisions. We obtain the N=4 SYM values
of the jet quenching parameter $\hat q$, which describes the energy loss of a
hard parton in QCD, and of the velocity-dependence of the quark-antiquark
screening length for a moving dipole as a function of the angle between its
velocity and its orientation. We show that if the quark-gluon plasma is flowing
with velocity v_f at an angle theta with respect to the trajectory of a hard
parton, the jet quenching parameter $\hat q$ is modified by a factor
gamma_f(1-v_f cos theta), and show that this result applies in QCD as in N=4
SYM. We discuss the relevance of the lessons we are learning from all these
calculations to heavy ion collisions at RHIC and at the LHC. Furthermore, we
discuss the relation between our results and those obtained in other theories
with gravity duals, showing in particular that the ratio between $\hat q$ in
any two conformal theories with gravity duals is the square root of the ratio
of their central charges. This leads us to conjecture that in nonconformal
theories $\hat q$ defines a quantity that always decreases along
renormalization group trajectories and allows us to use our calculation of
$\hat q$ in N=4 SYM to make a conjecture for its value in QCD.
| [
{
"created": "Wed, 13 Dec 2006 20:24:16 GMT",
"version": "v1"
},
{
"created": "Fri, 26 Jan 2007 18:22:50 GMT",
"version": "v2"
}
] | 2010-10-27 | [
[
"Liu",
"Hong",
"",
"MIT"
],
[
"Rajagopal",
"Krishna",
"",
"MIT"
],
[
"Wiedemann",
"Urs Achim",
"",
"CERN"
]
] | Expectation values of Wilson loops define the nonperturbative properties of the hot medium produced in heavy ion collisions that arise in the analysis of both radiative parton energy loss and quarkonium suppression. We use the AdS/CFT correspondence to calculate the expectation values of such Wilson loops in the strongly coupled plasma of N=4 super Yang-Mills (SYM) theory, allowing for the possibility that the plasma may be moving with some collective flow velocity as is the case in heavy ion collisions. We obtain the N=4 SYM values of the jet quenching parameter $\hat q$, which describes the energy loss of a hard parton in QCD, and of the velocity-dependence of the quark-antiquark screening length for a moving dipole as a function of the angle between its velocity and its orientation. We show that if the quark-gluon plasma is flowing with velocity v_f at an angle theta with respect to the trajectory of a hard parton, the jet quenching parameter $\hat q$ is modified by a factor gamma_f(1-v_f cos theta), and show that this result applies in QCD as in N=4 SYM. We discuss the relevance of the lessons we are learning from all these calculations to heavy ion collisions at RHIC and at the LHC. Furthermore, we discuss the relation between our results and those obtained in other theories with gravity duals, showing in particular that the ratio between $\hat q$ in any two conformal theories with gravity duals is the square root of the ratio of their central charges. This leads us to conjecture that in nonconformal theories $\hat q$ defines a quantity that always decreases along renormalization group trajectories and allows us to use our calculation of $\hat q$ in N=4 SYM to make a conjecture for its value in QCD. |
2211.14587 | Pengxuan Zhu | Jun Zhao, Jingya Zhu, Pengxuan Zhu and Rui Zhu | Light higgsino scenario confronted with muon g-2 | 20 pages, 8 figures and 1 table. Upgraded to the published version | null | 10.1103/PhysRevD.107.055030 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Light higgsinos below several hundred GeV are favored or required by the
naturalness of low energy supersymmetry. If only higgsinos are light while
other sparticles are sufficiently heavy, we have the so-called light higgsino
scenario. Confronted with the muon $g-2$ data, this scenario is examined in
this work. Since in this scenario the LSP (lightest sparticle) is
higgsino-like, we need to also consider the dark matter constraints. Assuming a
light higgsino mass parameter $\mu$ in the range of 100-400 GeV while gaugino
mass parameters above TeV, we explore the parameter space under the muon $g-2$
data and the dark matter constraints. We find that, to explain the muon $g-2$
anomaly at $2\sigma$, the winos and sleptons are respectively upper bounded by
3 TeV and 800 GeV. In this case, we find that the light higgsino-like dark
matter can sizably scatter with nucleon and thus the allowed parameter space
can be covered almost fully by the future LZ dark matter detection project. We
also perform a Monte Carlo simulation to figure out the potential of HL-LHC to
detect the light sleptons in this scenario. It turns out that compared with the
current LHC limits, the HL-LHC can further cover a part of the parameter space.
| [
{
"created": "Sat, 26 Nov 2022 15:08:25 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Mar 2023 06:16:49 GMT",
"version": "v2"
}
] | 2023-03-23 | [
[
"Zhao",
"Jun",
""
],
[
"Zhu",
"Jingya",
""
],
[
"Zhu",
"Pengxuan",
""
],
[
"Zhu",
"Rui",
""
]
] | Light higgsinos below several hundred GeV are favored or required by the naturalness of low energy supersymmetry. If only higgsinos are light while other sparticles are sufficiently heavy, we have the so-called light higgsino scenario. Confronted with the muon $g-2$ data, this scenario is examined in this work. Since in this scenario the LSP (lightest sparticle) is higgsino-like, we need to also consider the dark matter constraints. Assuming a light higgsino mass parameter $\mu$ in the range of 100-400 GeV while gaugino mass parameters above TeV, we explore the parameter space under the muon $g-2$ data and the dark matter constraints. We find that, to explain the muon $g-2$ anomaly at $2\sigma$, the winos and sleptons are respectively upper bounded by 3 TeV and 800 GeV. In this case, we find that the light higgsino-like dark matter can sizably scatter with nucleon and thus the allowed parameter space can be covered almost fully by the future LZ dark matter detection project. We also perform a Monte Carlo simulation to figure out the potential of HL-LHC to detect the light sleptons in this scenario. It turns out that compared with the current LHC limits, the HL-LHC can further cover a part of the parameter space. |
2201.10499 | Victor Goncalves | Ya-Ping Xie, Victor P. Goncalves | Exclusive processes in $ep$ collisions at the EIC and LHeC: A closer
look on the predictions of saturation models | 16 pages, 8 figures, 2 tables | null | 10.1103/PhysRevD.105.014033 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The exclusive production of vector mesons and photons in $ep$ collisions is
investigated considering three phenomenological saturation models based on
distinct assumptions for the treatment of the dipole - hadron scattering
amplitude. The latest high precision HERA data for the reduced and vector meson
cross sections are used to update the saturation model proposed by Marquet -
Peschanski - Soyez (MPS), which predicts that the saturation model is dependent
of the squared momentum transfer $t$. The MPS predictions for the photon
virtuality, energy and $t$ - dependencies of the exclusive $\rho$, $J/\Psi$ and
DVCS cross sections are presented and a detailed comparison with the results
derived using the impact parameter saturation models is performed. Our results
indicate that a future experimental analysis of the $t$ - distribution
$d\sigma/dt$ for exclusive processes in the kinematical range that will covered
by the EIC and LHeC, considering the distinct photon polarizations and large
values of $t$, will be able to discriminate between the distinct approaches for
the QCD dynamics at high energies.
| [
{
"created": "Tue, 25 Jan 2022 17:48:35 GMT",
"version": "v1"
}
] | 2022-02-09 | [
[
"Xie",
"Ya-Ping",
""
],
[
"Goncalves",
"Victor P.",
""
]
] | The exclusive production of vector mesons and photons in $ep$ collisions is investigated considering three phenomenological saturation models based on distinct assumptions for the treatment of the dipole - hadron scattering amplitude. The latest high precision HERA data for the reduced and vector meson cross sections are used to update the saturation model proposed by Marquet - Peschanski - Soyez (MPS), which predicts that the saturation model is dependent of the squared momentum transfer $t$. The MPS predictions for the photon virtuality, energy and $t$ - dependencies of the exclusive $\rho$, $J/\Psi$ and DVCS cross sections are presented and a detailed comparison with the results derived using the impact parameter saturation models is performed. Our results indicate that a future experimental analysis of the $t$ - distribution $d\sigma/dt$ for exclusive processes in the kinematical range that will covered by the EIC and LHeC, considering the distinct photon polarizations and large values of $t$, will be able to discriminate between the distinct approaches for the QCD dynamics at high energies. |
1510.07991 | Arsham Farzinnia | Arsham Farzinnia | Phenomenology of the Renormalizable Coloron Model | 10 pages, 5 figures. Contribution to the 18th International
Conference From the Planck Scale to the Electroweak Scale, 25-29 May 2015
(Ioannina, Greece), published by Proceedings of Science | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The renormalizable coloron model constitutes the minimal extension of the
standard model (SM) color sector to $SU(3)_{1c} \times SU(3)_{2c}$, with the
spontaneous symmetry breaking of the extended gauge group to the diagonal QCD
facilitated by the renormalizable operators. It predicts the existence of the
beyond the SM massive color-octet gauge bosons (colorons), colored and
uncolored scalar degrees of freedom, as well as potential spectator fermions
necessary for anomaly-cancelation purposes. Furthermore, keeping the ordinary
chiral quark charge assignments under the extended color gauge group in their
most general form, the framework (effectively) captures a large class of models
available within the literature. This contribution summarizes the current
formal and phenomenological constraints on the free parameter space of the
theory, as well as the LHC $\sqrt s = 14$ TeV prospects for discovering its
heavy scalar. The model is well-constrained and highly predictive; in
particular, it is shown that the parameter space can be thoroughly probed by
the LHC and the next generation hadron colliders, making it a promising beyond
the SM candidate for exploration. In addition, the significance of the NLO
corrections to the coloron production cross section are discussed.
| [
{
"created": "Tue, 27 Oct 2015 17:10:17 GMT",
"version": "v1"
}
] | 2015-10-28 | [
[
"Farzinnia",
"Arsham",
""
]
] | The renormalizable coloron model constitutes the minimal extension of the standard model (SM) color sector to $SU(3)_{1c} \times SU(3)_{2c}$, with the spontaneous symmetry breaking of the extended gauge group to the diagonal QCD facilitated by the renormalizable operators. It predicts the existence of the beyond the SM massive color-octet gauge bosons (colorons), colored and uncolored scalar degrees of freedom, as well as potential spectator fermions necessary for anomaly-cancelation purposes. Furthermore, keeping the ordinary chiral quark charge assignments under the extended color gauge group in their most general form, the framework (effectively) captures a large class of models available within the literature. This contribution summarizes the current formal and phenomenological constraints on the free parameter space of the theory, as well as the LHC $\sqrt s = 14$ TeV prospects for discovering its heavy scalar. The model is well-constrained and highly predictive; in particular, it is shown that the parameter space can be thoroughly probed by the LHC and the next generation hadron colliders, making it a promising beyond the SM candidate for exploration. In addition, the significance of the NLO corrections to the coloron production cross section are discussed. |
0709.3362 | George Lazarides | G. Lazarides, A. Vamvasakis (Aristotle U., Thessaloniki) | Standard-smooth hybrid inflation | 11 pages including 2 figures, uses Revtex, version to appear in Phys.
Rev. D | Phys.Rev.D76:123514,2007 | 10.1103/PhysRevD.76.123514 | UT-STPD-4/07 | hep-ph astro-ph | null | We consider the extended supersymmetric Pati-Salam model which, for mu>0 and
universal boundary conditions, succeeds to yield experimentally acceptable
b-quark masses by moderately violating Yukawa unification. It is known that
this model can lead to new shifted or new smooth hybrid inflation. We show that
a successful two-stage inflationary scenario can be realized within this model
based only on renormalizable superpotential interactions. The cosmological
scales exit the horizon during the first stage of inflation, which is of the
standard hybrid type and takes place along the trivial flat direction with the
inflaton driven by radiative corrections. Spectral indices compatible with the
recent data can be achieved in global supersymmetry or minimal supergravity by
restricting the number of e-foldings of our present horizon during the first
inflationary stage. The additional e-foldings needed for solving the horizon
and flatness problems are naturally provided by a second stage of inflation,
which occurs mainly along the built-in new smooth hybrid inflationary path
appearing right after the destabilization of the trivial flat direction at its
critical point. Monopoles are formed at the end of the first stage of inflation
and are, subsequently, diluted by the second stage of inflation to become
utterly negligible in the present universe for almost all (for all) the allowed
values of the parameters in the case of global supersymmetry (minimal
supergravity).
| [
{
"created": "Fri, 21 Sep 2007 07:34:31 GMT",
"version": "v1"
},
{
"created": "Sun, 16 Dec 2007 10:32:50 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Lazarides",
"G.",
"",
"Aristotle U., Thessaloniki"
],
[
"Vamvasakis",
"A.",
"",
"Aristotle U., Thessaloniki"
]
] | We consider the extended supersymmetric Pati-Salam model which, for mu>0 and universal boundary conditions, succeeds to yield experimentally acceptable b-quark masses by moderately violating Yukawa unification. It is known that this model can lead to new shifted or new smooth hybrid inflation. We show that a successful two-stage inflationary scenario can be realized within this model based only on renormalizable superpotential interactions. The cosmological scales exit the horizon during the first stage of inflation, which is of the standard hybrid type and takes place along the trivial flat direction with the inflaton driven by radiative corrections. Spectral indices compatible with the recent data can be achieved in global supersymmetry or minimal supergravity by restricting the number of e-foldings of our present horizon during the first inflationary stage. The additional e-foldings needed for solving the horizon and flatness problems are naturally provided by a second stage of inflation, which occurs mainly along the built-in new smooth hybrid inflationary path appearing right after the destabilization of the trivial flat direction at its critical point. Monopoles are formed at the end of the first stage of inflation and are, subsequently, diluted by the second stage of inflation to become utterly negligible in the present universe for almost all (for all) the allowed values of the parameters in the case of global supersymmetry (minimal supergravity). |
0907.0906 | Tony Gherghetta | Yanou Cui, Tony Gherghetta, James D. Wells | Emergent Electroweak Symmetry Breaking with Composite W, Z Bosons | 39 pages, 4 figures | null | 10.1088/1126-6708/2009/11/080 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a model of electroweak symmetry breaking in a warped extra
dimension where electroweak symmetry is broken at the UV (or Planck) scale. An
underlying conformal symmetry is broken at the IR (or TeV) scale generating
masses for the electroweak gauge bosons without invoking a Higgs mechanism. By
the AdS/CFT correspondence the W,Z bosons are identified as composite states of
a strongly-coupled gauge theory, suggesting that electroweak symmetry breaking
is an emergent phenomenon at the IR scale. The model satisfies electroweak
precision tests with reasonable fits to the S and T parameter. In particular
the T parameter is sufficiently suppressed since the model naturally admits a
custodial SU(2) symmetry. The composite nature of the W,Z-bosons provide a
novel possibility of unitarizing WW scattering via form factor suppression.
Constraints from LEP and the Tevatron as well as discovery opportunities at the
LHC are discussed for these composite electroweak gauge bosons.
| [
{
"created": "Mon, 6 Jul 2009 02:24:59 GMT",
"version": "v1"
}
] | 2015-05-13 | [
[
"Cui",
"Yanou",
""
],
[
"Gherghetta",
"Tony",
""
],
[
"Wells",
"James D.",
""
]
] | We present a model of electroweak symmetry breaking in a warped extra dimension where electroweak symmetry is broken at the UV (or Planck) scale. An underlying conformal symmetry is broken at the IR (or TeV) scale generating masses for the electroweak gauge bosons without invoking a Higgs mechanism. By the AdS/CFT correspondence the W,Z bosons are identified as composite states of a strongly-coupled gauge theory, suggesting that electroweak symmetry breaking is an emergent phenomenon at the IR scale. The model satisfies electroweak precision tests with reasonable fits to the S and T parameter. In particular the T parameter is sufficiently suppressed since the model naturally admits a custodial SU(2) symmetry. The composite nature of the W,Z-bosons provide a novel possibility of unitarizing WW scattering via form factor suppression. Constraints from LEP and the Tevatron as well as discovery opportunities at the LHC are discussed for these composite electroweak gauge bosons. |
hep-ph/0512305 | J.D. Vergados | J. D. Vergados (Unuversity of Ioannina, Ioannina, Greece) | Direct SUSY Dark Matter Detection- Constraints on the Spin Cross Section | 15 LaTex pages, 21 figures, 2 tables | null | null | null | hep-ph | null | The recent WMAP data have confirmed that exotic dark matter together with the
vacuum energy (cosmological constant) dominate in the flat Universe. Thus the
direct dark matter detection, consisting of detecting the recoiling nucleus, is
central to particle physics and cosmology. Supersymmetry provides a natural
dark matter candidate, the lightest supersymmetric particle (LSP). The relevant
cross sections arise out of two mechanisms: i) The coherent mode, due to the
scalar interaction and ii) The spin contribution arising from the axial
current. In this paper we will focus on the spin contribution, which maybe
important, especially for light targets.
| [
{
"created": "Thu, 22 Dec 2005 18:37:04 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Dec 2005 22:00:02 GMT",
"version": "v2"
},
{
"created": "Sun, 25 Dec 2005 18:20:08 GMT",
"version": "v3"
},
{
"created": "Mon, 9 Jan 2006 20:19:13 GMT",
"version": "v4"
}
] | 2007-05-23 | [
[
"Vergados",
"J. D.",
"",
"Unuversity of Ioannina, Ioannina, Greece"
]
] | The recent WMAP data have confirmed that exotic dark matter together with the vacuum energy (cosmological constant) dominate in the flat Universe. Thus the direct dark matter detection, consisting of detecting the recoiling nucleus, is central to particle physics and cosmology. Supersymmetry provides a natural dark matter candidate, the lightest supersymmetric particle (LSP). The relevant cross sections arise out of two mechanisms: i) The coherent mode, due to the scalar interaction and ii) The spin contribution arising from the axial current. In this paper we will focus on the spin contribution, which maybe important, especially for light targets. |
hep-ph/9906421 | Fred Olness | R. N. Mohapatra, F. Olness, R. Stroynowski, V. L. Teplitz | Searching for Strongly Interacting Massive Particles (SIMPs) | RevTeX, 10 pages, 3 figures; Minor updates to match published version | Phys. Rev. D 60, 115013 (1999) | 10.1103/PhysRevD.60.115013 | UMD-PP-99-118 | hep-ph | null | We consider laboratory experiments that can detect stable, neutral strongly
interacting massive particles (SIMPs). We explore the SIMP annihilation cross
section from its minimum value (restricted by cosmological bounds) to the barn
range, and vary the mass values from a GeV to a TeV. We calculate, as a
function of the SIMP-nucleon cross section, the minimum nucleon number A for
which there should be binding in a nucleus. We consider accelerator mass
spectrometry with a gold (A=200) target, and compute the likely abundance of
anomalous gold nuclei if stable neutral SIMPs exist. We also consider the
prospects and problems of detecting such particles at the Tevatron. We estimate
optimistically that such detection might be possible for SIMPs with
SIMP-nucleon cross sections larger than 0.1 millibarn and masses between 25 and
50 GeV.
| [
{
"created": "Thu, 17 Jun 1999 18:56:24 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Sep 1999 19:22:44 GMT",
"version": "v2"
}
] | 2016-08-25 | [
[
"Mohapatra",
"R. N.",
""
],
[
"Olness",
"F.",
""
],
[
"Stroynowski",
"R.",
""
],
[
"Teplitz",
"V. L.",
""
]
] | We consider laboratory experiments that can detect stable, neutral strongly interacting massive particles (SIMPs). We explore the SIMP annihilation cross section from its minimum value (restricted by cosmological bounds) to the barn range, and vary the mass values from a GeV to a TeV. We calculate, as a function of the SIMP-nucleon cross section, the minimum nucleon number A for which there should be binding in a nucleus. We consider accelerator mass spectrometry with a gold (A=200) target, and compute the likely abundance of anomalous gold nuclei if stable neutral SIMPs exist. We also consider the prospects and problems of detecting such particles at the Tevatron. We estimate optimistically that such detection might be possible for SIMPs with SIMP-nucleon cross sections larger than 0.1 millibarn and masses between 25 and 50 GeV. |
1706.00437 | Sebastian Pa{\ss}ehr | Florian Domingo, Peter Drechsel, and Sebastian Pa{\ss}ehr | On-Shell neutral Higgs bosons in the NMSSM with complex parameters | 28 pages, 11 figures | null | 10.1140/epjc/s10052-017-5104-2 | DESY--17--067; IFT--UAM/CSIC--17--042 | hep-ph | http://creativecommons.org/licenses/by/4.0/ | The Next-to-Minimal Supersymmetric Standard model (NMSSM) appears as an
interesting candidate for the interpretation of the Higgs-measurement at the
LHC and as a rich framework embedding physics beyond the Standard Model. We
consider the renormalization of the Higgs sector of this model in its
$\mathcal{CP}$-violating version, and propose a renormalization scheme for the
calculation of on-shell Higgs masses. Moreover, the connection between the
physical states and the tree-level ones is no longer trivial at the radiative
level: a proper description of the corresponding transition thus proves
necessary in order to calculate Higgs production and decays at a consistent
loop order. After discussing these formal aspects, we compare the results of
our mass calculation to the output of existing tools. We also study the
relevance of the on-shell transition-matrix in the example of the $h_i \to
\tau^+ \tau^-$ width. We find deviations between our full prescription and
popular approximations that can exceed $10\%$.
| [
{
"created": "Thu, 1 Jun 2017 18:00:06 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Jul 2017 12:02:57 GMT",
"version": "v2"
}
] | 2017-09-13 | [
[
"Domingo",
"Florian",
""
],
[
"Drechsel",
"Peter",
""
],
[
"Paßehr",
"Sebastian",
""
]
] | The Next-to-Minimal Supersymmetric Standard model (NMSSM) appears as an interesting candidate for the interpretation of the Higgs-measurement at the LHC and as a rich framework embedding physics beyond the Standard Model. We consider the renormalization of the Higgs sector of this model in its $\mathcal{CP}$-violating version, and propose a renormalization scheme for the calculation of on-shell Higgs masses. Moreover, the connection between the physical states and the tree-level ones is no longer trivial at the radiative level: a proper description of the corresponding transition thus proves necessary in order to calculate Higgs production and decays at a consistent loop order. After discussing these formal aspects, we compare the results of our mass calculation to the output of existing tools. We also study the relevance of the on-shell transition-matrix in the example of the $h_i \to \tau^+ \tau^-$ width. We find deviations between our full prescription and popular approximations that can exceed $10\%$. |
1805.00088 | Paolo Parotto | R. Bellwied, J. Noronha-Hostler, P. Parotto, I. Portillo Vazquez, C.
Ratti, J. M. Stafford | Freeze-out temperature from net-Kaon fluctuations at RHIC | 5 pages, 3 figures | Phys. Rev. C 99, 034912 (2019) | 10.1103/PhysRevC.99.034912 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compare the mean-over-variance ratio of the net-kaon distribution
calculated within a state-of-the-art hadron resonance gas model to the latest
experimental data from the Beam Energy Scan at RHIC by the STAR collaboration.
Our analysis indicates that it is not possible to reproduce the experimental
results using the freeze-out parameters from the existing combined fit of
net-proton and net-electric charge mean-over-variance. The strange mesons need
about 10-15 MeV higher temperatures than the light hadrons at the highest
collision energies. In view of the future $\Lambda$ fluctuation measurements,
we predict the $\Lambda$ variance-over-mean and skewness-times-variance at the
light and strange chemical freeze-out parameters. We observe that the $\Lambda$
fluctuations are sensitive to the difference in the freeze-out temperatures
established in this analysis. Our results have implications for other
phenomenological models in the field of relativistic heavy ion collisions.
| [
{
"created": "Mon, 30 Apr 2018 20:29:34 GMT",
"version": "v1"
}
] | 2019-04-03 | [
[
"Bellwied",
"R.",
""
],
[
"Noronha-Hostler",
"J.",
""
],
[
"Parotto",
"P.",
""
],
[
"Vazquez",
"I. Portillo",
""
],
[
"Ratti",
"C.",
""
],
[
"Stafford",
"J. M.",
""
]
] | We compare the mean-over-variance ratio of the net-kaon distribution calculated within a state-of-the-art hadron resonance gas model to the latest experimental data from the Beam Energy Scan at RHIC by the STAR collaboration. Our analysis indicates that it is not possible to reproduce the experimental results using the freeze-out parameters from the existing combined fit of net-proton and net-electric charge mean-over-variance. The strange mesons need about 10-15 MeV higher temperatures than the light hadrons at the highest collision energies. In view of the future $\Lambda$ fluctuation measurements, we predict the $\Lambda$ variance-over-mean and skewness-times-variance at the light and strange chemical freeze-out parameters. We observe that the $\Lambda$ fluctuations are sensitive to the difference in the freeze-out temperatures established in this analysis. Our results have implications for other phenomenological models in the field of relativistic heavy ion collisions. |
2008.02668 | Sergei Vergeles | N.N. Nikolaev and S.N. Vergeles | General relativity and precision tests of fundamental symmetries | 29 pages, To be published in Gribov-90 Memorial Volume: Field Theory,
Symmetry, and Related Topics. Editors Yuri L. Dokshitzer, Peter Levai. Arpad
Lukacs and Julia Nyiri, World Scientific, 2020 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Search for the Electric Dipole Moment of nuclear particles is at the
forefront of incessant quest for CP violation beyond Standard Model. The
ultimate target is to reach a sensitivity to the electric dipole moment of
neutrons, protons, deuterons etc. at the level of $\sim 10^{-15}$ nuclear
magnetons. Defying the common lore on weakness of gravity, spurious signals
induced by curved space-time in the gravity field of the rotating Earth become
quite substantial at such a daunting sensitivity. We review the recent
development in the field with an emphasis on the geometric magnetic field in
pure electrostatic systems at rest on the rotating Earth.
| [
{
"created": "Wed, 5 Aug 2020 09:26:23 GMT",
"version": "v1"
}
] | 2020-08-07 | [
[
"Nikolaev",
"N. N.",
""
],
[
"Vergeles",
"S. N.",
""
]
] | Search for the Electric Dipole Moment of nuclear particles is at the forefront of incessant quest for CP violation beyond Standard Model. The ultimate target is to reach a sensitivity to the electric dipole moment of neutrons, protons, deuterons etc. at the level of $\sim 10^{-15}$ nuclear magnetons. Defying the common lore on weakness of gravity, spurious signals induced by curved space-time in the gravity field of the rotating Earth become quite substantial at such a daunting sensitivity. We review the recent development in the field with an emphasis on the geometric magnetic field in pure electrostatic systems at rest on the rotating Earth. |
hep-ph/9907270 | null | I.I. Bigi | Memo on Extracting |V(cb)| and |V(ub)/V(cb)| from semileptonic B decays | Contributed to the Informal Workshop on the Derivation of |V(cb)| and
|V(ub)|, CERN, May 28 - June 2, 1999, 19 pages, LATEX | null | null | null | hep-ph | null | Heavy Quark Expansions for semileptonic decays of beauty hadrons are briefly
reviewed. I analyze how $|V(cb)|$ can be extracted from the semileptonic width
of $B$ mesons, the average semileptonic width of all weakly decaying beauty
hadrons and from $B \ra l \nu D^*$ at zero recoil. Special attention is paid to
present theoretical uncertainties (including correlations among them) and on
how to reduce them in the future. Finally I will comment on theoretical
uncertainties in $|V(ub)/V(cb)|$.
| [
{
"created": "Wed, 7 Jul 1999 15:46:17 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Bigi",
"I. I.",
""
]
] | Heavy Quark Expansions for semileptonic decays of beauty hadrons are briefly reviewed. I analyze how $|V(cb)|$ can be extracted from the semileptonic width of $B$ mesons, the average semileptonic width of all weakly decaying beauty hadrons and from $B \ra l \nu D^*$ at zero recoil. Special attention is paid to present theoretical uncertainties (including correlations among them) and on how to reduce them in the future. Finally I will comment on theoretical uncertainties in $|V(ub)/V(cb)|$. |
0810.4429 | Naoto Tanji | Naoto Tanji | Dynamical view of pair creation in uniform electric and magnetic fields | 57pages, 44figures. v2: typos corrected, references added, to appear
in Ann.Phys | Annals Phys.324:1691-1736,2009 | 10.1016/j.aop.2009.03.012 | UT-Komaba/08-15 | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Pair creation in a uniform classical electromagnetic field (Schwinger
mechanism) is studied focusing on the time evolution of the distribution of
created particles. The time evolution of the distribution in time-dependent
fields is also presented as well as effects of back reaction. Motivated by the
Glasma flux tube, which may be formed at the initial stage of heavy-ion
collisions, we investigate effects of a magnetic field parallel to an electric
field, and find that the magnetic field makes the evolution of a fermion system
faster.
| [
{
"created": "Fri, 24 Oct 2008 14:06:27 GMT",
"version": "v1"
},
{
"created": "Tue, 12 May 2009 10:33:28 GMT",
"version": "v2"
}
] | 2010-04-15 | [
[
"Tanji",
"Naoto",
""
]
] | Pair creation in a uniform classical electromagnetic field (Schwinger mechanism) is studied focusing on the time evolution of the distribution of created particles. The time evolution of the distribution in time-dependent fields is also presented as well as effects of back reaction. Motivated by the Glasma flux tube, which may be formed at the initial stage of heavy-ion collisions, we investigate effects of a magnetic field parallel to an electric field, and find that the magnetic field makes the evolution of a fermion system faster. |
1001.1129 | Seung Woo Ham | S. W. Ham, Seong-A Shim, S. K. Oh | Electroweak baryogenesis in the MSSM with vector-like quarks | 16 pages, 3 figures, 2 tables | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the minimal supersymmetric standard model (MSSM), a strongly first-order
electroweak phase transition (EWPT) is only possible in a confined parameter
region where one of the scalar top quarks is lighter than the top quark and the
other one is as heavy as the SUSY breaking scale. If the MSSM is enlarged to
accommodate vector-like quarks and their superpartners, we find that the
strongly first-order EWPT is possible without requiring light scalar top quark
at the one-loop level, in the limit where the lightest scalar Higgs boson of
the MSSM behaves like the Higgs boson of the standard model and the other Higgs
bosons are all as heavy as the SUSY breaking scale. The strength of the
first-order EWPT is found to be dependent on the mass of the lightest neutral
Higgs boson and the mixing effects of the vector-like scalar quarks.
| [
{
"created": "Thu, 7 Jan 2010 18:36:22 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Apr 2010 09:16:03 GMT",
"version": "v2"
}
] | 2010-04-13 | [
[
"Ham",
"S. W.",
""
],
[
"Shim",
"Seong-A",
""
],
[
"Oh",
"S. K.",
""
]
] | In the minimal supersymmetric standard model (MSSM), a strongly first-order electroweak phase transition (EWPT) is only possible in a confined parameter region where one of the scalar top quarks is lighter than the top quark and the other one is as heavy as the SUSY breaking scale. If the MSSM is enlarged to accommodate vector-like quarks and their superpartners, we find that the strongly first-order EWPT is possible without requiring light scalar top quark at the one-loop level, in the limit where the lightest scalar Higgs boson of the MSSM behaves like the Higgs boson of the standard model and the other Higgs bosons are all as heavy as the SUSY breaking scale. The strength of the first-order EWPT is found to be dependent on the mass of the lightest neutral Higgs boson and the mixing effects of the vector-like scalar quarks. |
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