id stringlengths 9 14 | submitter stringlengths 1 56 ⌀ | authors stringlengths 5 7.68k | title stringlengths 3 299 | comments stringlengths 1 1.15k ⌀ | journal-ref stringlengths 9 298 ⌀ | doi stringlengths 12 97 ⌀ | report-no stringlengths 3 341 ⌀ | categories stringclasses 869 values | license stringclasses 9 values | orig_abstract stringlengths 16 2.44k | versions listlengths 1 39 | update_date stringlengths 10 10 | authors_parsed listlengths 1 565 | abstract stringlengths 13 2.44k |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1505.02785 | Fei Wang | Fei Wang, Wenyu Wang, Jin Min Yang, Yang Zhang | Heavy colored SUSY partners from deflected anomaly mediation | 16 pages, 6 figures | JHEP07(2015)138 | 10.1007/JHEP07(2015)138 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a deflected anomaly mediation scenario from SUSY QCD which can
lead to both positive and negative deflection parameters (there is a smooth
transition between these two deflection parameter regions by adjusting certain
couplings). Such a scenario can naturally give a SUSY spectrum in which all the
colored sparticles are heavy while the sleptons are light. As a result, the
discrepancy between the Brookheaven $g_\mu-2$ experiment and LHC data can be
reconciled in this scenario. We also find that the parameter space for
explaining the $g_\mu-2$ anomaly at $1\sigma$ level can be fully covered by the
future LUX-ZEPLIN 7.2 Ton experiment.
| [
{
"created": "Mon, 11 May 2015 20:01:37 GMT",
"version": "v1"
}
] | 2015-09-29 | [
[
"Wang",
"Fei",
""
],
[
"Wang",
"Wenyu",
""
],
[
"Yang",
"Jin Min",
""
],
[
"Zhang",
"Yang",
""
]
] | We propose a deflected anomaly mediation scenario from SUSY QCD which can lead to both positive and negative deflection parameters (there is a smooth transition between these two deflection parameter regions by adjusting certain couplings). Such a scenario can naturally give a SUSY spectrum in which all the colored sparticles are heavy while the sleptons are light. As a result, the discrepancy between the Brookheaven $g_\mu-2$ experiment and LHC data can be reconciled in this scenario. We also find that the parameter space for explaining the $g_\mu-2$ anomaly at $1\sigma$ level can be fully covered by the future LUX-ZEPLIN 7.2 Ton experiment. |
hep-ph/9904354 | Adrian Mirea | Adrian Mirea, Elemer Nagy | Study of the determination of the SUGRA parameters using the ATLAS
detector in the case of L-violating R parity breaking | 52 pages, 46 figures | null | null | null | hep-ph | null | Simulating pp collisions at LHC energies in the framework of the SUGRA model
and the detection of the produced leptons and jets by ATLAS we demonstrate that
a clean signature of SUSY can be obtained over a large domain of the parameter
space in the case of L-violating R parity breaking ($\lambda$ couplings). The
obtained signal allows the reconstruction of the SUSY particles and thereby the
precise determination of the model parameters $m_0, m_{1/2}, tan\beta$ and sign
$\mu$.
| [
{
"created": "Fri, 16 Apr 1999 00:08:38 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Mirea",
"Adrian",
""
],
[
"Nagy",
"Elemer",
""
]
] | Simulating pp collisions at LHC energies in the framework of the SUGRA model and the detection of the produced leptons and jets by ATLAS we demonstrate that a clean signature of SUSY can be obtained over a large domain of the parameter space in the case of L-violating R parity breaking ($\lambda$ couplings). The obtained signal allows the reconstruction of the SUSY particles and thereby the precise determination of the model parameters $m_0, m_{1/2}, tan\beta$ and sign $\mu$. |
0912.3317 | Yi-Fu Cai | Yi-Fu Cai, Mingzhe Li, Xinmin Zhang | Testing the Lorentz and CPT Symmetry with CMB polarizations and a
non-relativistic Maxwell Theory | 7 pages, 2 figures, accepted on JCAP, a few references added | JCAP 1001:017,2010 | 10.1088/1475-7516/2010/01/017 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a model for a system involving a photon gauge field and a scalar
field at quantum criticality in the frame of a Lifthitz-type non-relativistic
Maxwell theory. We will show this model gives rise to Lorentz and CPT violation
which leads to a frequency-dependent rotation of polarization plane of
radiations, and so leaves potential signals on the cosmic microwave background
temperature and polarization anisotropies.
| [
{
"created": "Thu, 17 Dec 2009 05:18:22 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Jan 2010 13:58:55 GMT",
"version": "v2"
}
] | 2014-11-20 | [
[
"Cai",
"Yi-Fu",
""
],
[
"Li",
"Mingzhe",
""
],
[
"Zhang",
"Xinmin",
""
]
] | We present a model for a system involving a photon gauge field and a scalar field at quantum criticality in the frame of a Lifthitz-type non-relativistic Maxwell theory. We will show this model gives rise to Lorentz and CPT violation which leads to a frequency-dependent rotation of polarization plane of radiations, and so leaves potential signals on the cosmic microwave background temperature and polarization anisotropies. |
hep-ph/0603166 | Sergey Afonin | S.S. Afonin | Experimental indication on chiral symmetry restoration in meson spectrum | To be published in Phys. Lett. B, 10 pages, 1 figure, some comments
and references are added | Phys.Lett. B639 (2006) 258-262 | 10.1016/j.physletb.2006.06.057 | UB-ECM-PF-06/10 | hep-ph | null | The spectroscopic predictions of the Ademollo-Veneziano-Weinberg dual model
are critically tested in view of the modern experimental data. The predicted
equidistance of masses squared for chiral partners is shown to be violated high
in energies, instead one observes an approximate degeneracy of these
quantities. This phenomenon can be interpreted as the restoration of
Wigner-Weyl realization of chiral symmetry for highly excited states. The scale
of complete restoration is expected to be 2.5 GeV. A multispin-parity cluster
structure of meson spectrum is revealed.
| [
{
"created": "Tue, 21 Mar 2006 18:42:29 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Jun 2006 16:32:13 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Afonin",
"S. S.",
""
]
] | The spectroscopic predictions of the Ademollo-Veneziano-Weinberg dual model are critically tested in view of the modern experimental data. The predicted equidistance of masses squared for chiral partners is shown to be violated high in energies, instead one observes an approximate degeneracy of these quantities. This phenomenon can be interpreted as the restoration of Wigner-Weyl realization of chiral symmetry for highly excited states. The scale of complete restoration is expected to be 2.5 GeV. A multispin-parity cluster structure of meson spectrum is revealed. |
1501.04637 | Giulia Zanderighi | Keith Hamilton, Paolo Nason, Giulia Zanderighi | Finite quark-mass effects in the NNLOPS POWHEG+MiNLO Higgs generator | 23 pages, 7 figures | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We include finite top- and bottom-mass effects in the next-to-next-to-leading
order parton shower (NNLOPS) event generator for inclusive Higgs boson
production in gluon fusion based upon the POWHEG+MiNLO approach. Since
fixed-order results for quark-mass effects only reach NLO accuracy, we add them
to the NNLOPS generator at that accuracy. We explore uncertainties related to
the unknown all-order logarithmic structure of bottom-mass effects by comparing
the assumption of full exponentiation to no exponentiation at all.
Phenomenological results showing the effects of finite quark-masses in the
NNLOPS simulation are presented. These suggest that the aforementioned
uncertainty is well contained within the envelope of plain renormalization and
factorization scale uncertainties.
| [
{
"created": "Mon, 19 Jan 2015 21:00:50 GMT",
"version": "v1"
}
] | 2015-01-21 | [
[
"Hamilton",
"Keith",
""
],
[
"Nason",
"Paolo",
""
],
[
"Zanderighi",
"Giulia",
""
]
] | We include finite top- and bottom-mass effects in the next-to-next-to-leading order parton shower (NNLOPS) event generator for inclusive Higgs boson production in gluon fusion based upon the POWHEG+MiNLO approach. Since fixed-order results for quark-mass effects only reach NLO accuracy, we add them to the NNLOPS generator at that accuracy. We explore uncertainties related to the unknown all-order logarithmic structure of bottom-mass effects by comparing the assumption of full exponentiation to no exponentiation at all. Phenomenological results showing the effects of finite quark-masses in the NNLOPS simulation are presented. These suggest that the aforementioned uncertainty is well contained within the envelope of plain renormalization and factorization scale uncertainties. |
0908.2472 | Alex Gomes Dias | Alex G. Dias, V. Pleitez | Stabilization of the Electroweak Scale in 3-3-1 Models | 10 pages. Version with some improvements and corrections in the text | Phys.Rev.D80:056007,2009 | 10.1103/PhysRevD.80.056007 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | One way of avoiding the destabilization of the electroweak scale through a
strong coupled regime naturally occurs in models with a Landau-like pole at the
TeV scale. Hence, the quadratic divergence contributions to the scalar masses
are not considered as a problem anymore since a new nonperturbative dynamic
emerges at the TeV scale. This scale should be an intrinsic feature of the
models and there is no need to invoke any other sort of protection for the
electroweak scale. In some models based on the $SU(3)_C\otimes SU(3)_W\otimes
U(1)_{X}$ gauge symmetry, a nonperturbative dynamics arise and it stabilizes
the electroweak scale.
| [
{
"created": "Tue, 18 Aug 2009 01:15:38 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Sep 2009 13:53:51 GMT",
"version": "v2"
}
] | 2009-11-05 | [
[
"Dias",
"Alex G.",
""
],
[
"Pleitez",
"V.",
""
]
] | One way of avoiding the destabilization of the electroweak scale through a strong coupled regime naturally occurs in models with a Landau-like pole at the TeV scale. Hence, the quadratic divergence contributions to the scalar masses are not considered as a problem anymore since a new nonperturbative dynamic emerges at the TeV scale. This scale should be an intrinsic feature of the models and there is no need to invoke any other sort of protection for the electroweak scale. In some models based on the $SU(3)_C\otimes SU(3)_W\otimes U(1)_{X}$ gauge symmetry, a nonperturbative dynamics arise and it stabilizes the electroweak scale. |
1709.00880 | Oliver Fischer Dr. | Stefan Antusch, Oliver Fischer | Searches for Sterile Neutrinos at Future Electron-Proton Colliders | Conference proceedings for the DIS 2017 in Birmingham, 13 pages, 8
figures, 2 tables | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Sterile neutrinos are an attractive extension of the Standard Model of
elementary particles towards including a mechanism for generating the observed
light neutrino masses. We discuss that when an approximate protective "lepton
number"-like symmetry is present, the sterile neutrinos can have masses around
the electroweak scale and potentially large neutrino Yukawa couplings, which
makes them well testable at planned future particle colliders. We
systematically discuss the production and decay channels for sterile neutrinos
at electron-proton colliders and give a complete list of the leading order
signatures for sterile neutrino searches. We highlight several novel search
channels and present a first look at the possible sensitivities for the
active-sterile mixing parameters and the heavy neutrino masses. We also compare
the performance of electron-proton colliders with the ones of proton-proton and
electron-positron colliders, and discuss the complementarity of the different
collider types.
| [
{
"created": "Mon, 4 Sep 2017 09:51:23 GMT",
"version": "v1"
}
] | 2017-09-05 | [
[
"Antusch",
"Stefan",
""
],
[
"Fischer",
"Oliver",
""
]
] | Sterile neutrinos are an attractive extension of the Standard Model of elementary particles towards including a mechanism for generating the observed light neutrino masses. We discuss that when an approximate protective "lepton number"-like symmetry is present, the sterile neutrinos can have masses around the electroweak scale and potentially large neutrino Yukawa couplings, which makes them well testable at planned future particle colliders. We systematically discuss the production and decay channels for sterile neutrinos at electron-proton colliders and give a complete list of the leading order signatures for sterile neutrino searches. We highlight several novel search channels and present a first look at the possible sensitivities for the active-sterile mixing parameters and the heavy neutrino masses. We also compare the performance of electron-proton colliders with the ones of proton-proton and electron-positron colliders, and discuss the complementarity of the different collider types. |
1410.1817 | Alessandro Strumia | Oleg Antipin, Michele Redi, Alessandro Strumia | Dynamical generation of the weak and Dark Matter scales from strong
interactions | 22 pages, 4 figures. v2: final version to appear on JHEP | null | 10.1007/JHEP01(2015)157 | IFUP-TH/2014 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Assuming that mass scales arise in nature only via dimensional transmutation,
we extend the dimension-less Standard Model by adding vector-like fermions
charged under a new strong gauge interaction. Their non-perturbative dynamics
generates a mass scale that is transmitted to the elementary Higgs boson by
electro-weak gauge interactions. In its minimal version the model has the same
number of parameters as the Standard Model, predicts that the electro-weak
symmetry gets broken, predicts new-physics in the multi-TeV region and is
compatible with all existing bounds, provides two Dark Matter candidates stable
thanks to accidental symmetries: a composite scalar in the adjoint of SU(2)_L
and a composite singlet fermion; their thermal relic abundance is predicted to
be comparable to the measured cosmological DM abundance. Some models of this
type allow for extra Yukawa couplings; DM candidates remain even if explicit
masses are added.
| [
{
"created": "Tue, 7 Oct 2014 17:50:42 GMT",
"version": "v1"
},
{
"created": "Fri, 6 Feb 2015 15:02:29 GMT",
"version": "v2"
}
] | 2015-06-23 | [
[
"Antipin",
"Oleg",
""
],
[
"Redi",
"Michele",
""
],
[
"Strumia",
"Alessandro",
""
]
] | Assuming that mass scales arise in nature only via dimensional transmutation, we extend the dimension-less Standard Model by adding vector-like fermions charged under a new strong gauge interaction. Their non-perturbative dynamics generates a mass scale that is transmitted to the elementary Higgs boson by electro-weak gauge interactions. In its minimal version the model has the same number of parameters as the Standard Model, predicts that the electro-weak symmetry gets broken, predicts new-physics in the multi-TeV region and is compatible with all existing bounds, provides two Dark Matter candidates stable thanks to accidental symmetries: a composite scalar in the adjoint of SU(2)_L and a composite singlet fermion; their thermal relic abundance is predicted to be comparable to the measured cosmological DM abundance. Some models of this type allow for extra Yukawa couplings; DM candidates remain even if explicit masses are added. |
1712.02618 | Adam Bzdak | Micha{\l} Barej, Adam Bzdak, Pawe{\l} Gutowski | Wounded quark emission function at the top RHIC energy | 9 pages, 5 figures; requested predictions for p+Al, p+Au, d+Au and
3He+Au added in Appendix A | Phys. Rev. C 97, 034901 (2018) | 10.1103/PhysRevC.97.034901 | null | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The wounded nucleon and quark emission functions are extracted for different
centralities in d+Au collisions at $\sqrt{s}=200\ \text{GeV}$ using Monte Carlo
simulations and experimental data. The shape of the emission function depends
on centrality in the wounded nucleon model, whereas it is practically universal
(within uncertainties) in the wounded quark model. Predictions for
$dN_{ch}/d\eta$ distributions in p+Au and $^3$He+Au collisions are presented.
| [
{
"created": "Thu, 7 Dec 2017 13:48:49 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Apr 2018 12:36:58 GMT",
"version": "v2"
}
] | 2018-04-19 | [
[
"Barej",
"Michał",
""
],
[
"Bzdak",
"Adam",
""
],
[
"Gutowski",
"Paweł",
""
]
] | The wounded nucleon and quark emission functions are extracted for different centralities in d+Au collisions at $\sqrt{s}=200\ \text{GeV}$ using Monte Carlo simulations and experimental data. The shape of the emission function depends on centrality in the wounded nucleon model, whereas it is practically universal (within uncertainties) in the wounded quark model. Predictions for $dN_{ch}/d\eta$ distributions in p+Au and $^3$He+Au collisions are presented. |
hep-ph/0206200 | Chris Allton | C.R. Allton, S. Ejiri, S.J. Hands, O. Kaczmarek, F. Karsch, E.
Laermann, Ch. Schmidt, and L. Scorzato | QCD at non-zero chemical potential and temperature from the lattice | Invited paper presented at the Joint Workshop on Physics at the
Japanese Hadron Facility, March 2002, Adelaide. 10 pages, uses
ws-procs9x6.cls style file (provided) | null | 10.1142/9789812776662_0015 | SWAT/340 | hep-ph hep-lat | null | A study of QCD at non-zero chemical potential, mu, and temperature, T, is
performed using the lattice technique. The transition temperature (between the
confined and deconfined phases) is determined as a function of mu and is found
to be in agreement with other work. In addition the variation of the pressure
and energy density with mu is obtained for small positive mu. These results are
of particular relevance for heavy-ion collision experiments.
| [
{
"created": "Fri, 21 Jun 2002 05:53:58 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Allton",
"C. R.",
""
],
[
"Ejiri",
"S.",
""
],
[
"Hands",
"S. J.",
""
],
[
"Kaczmarek",
"O.",
""
],
[
"Karsch",
"F.",
""
],
[
"Laermann",
"E.",
""
],
[
"Schmidt",
"Ch.",
""
],
[
"Scorzato",
"L.",
""
]
] | A study of QCD at non-zero chemical potential, mu, and temperature, T, is performed using the lattice technique. The transition temperature (between the confined and deconfined phases) is determined as a function of mu and is found to be in agreement with other work. In addition the variation of the pressure and energy density with mu is obtained for small positive mu. These results are of particular relevance for heavy-ion collision experiments. |
hep-ph/0205189 | Junpei Harada | Junpei Harada | Phenomenological approach to symmetry breaking pattern of democratic
mass matrix | 10 pages | null | null | null | hep-ph | null | We investigate the symmetry breaking pattern of the democratic mass matrix
model, which leads to the small flavor mixing in quark sector and bi-large
mixing in lepton sector. We present the symmetry breaking matrices in quark
sector which are determined by alternative ways instead of conventional ansatz.
These matrices might be useful for understanding the origin of democratic
symmetry and its breaking.
| [
{
"created": "Fri, 17 May 2002 10:40:42 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Harada",
"Junpei",
""
]
] | We investigate the symmetry breaking pattern of the democratic mass matrix model, which leads to the small flavor mixing in quark sector and bi-large mixing in lepton sector. We present the symmetry breaking matrices in quark sector which are determined by alternative ways instead of conventional ansatz. These matrices might be useful for understanding the origin of democratic symmetry and its breaking. |
1005.2928 | Tom\'a\v{s} Brauner | Tian Zhang, Tomas Brauner and Dirk H. Rischke | QCD-like theories at nonzero temperature and density | JHEP class, 31 pages, 7 eps figures; v2: error in Eq. (3.11) fixed,
two references added; matches published version | JHEP 1006:064,2010 | 10.1007/JHEP06(2010)064 | INT-PUB-10-018 | hep-ph hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the properties of hot and/or dense matter in QCD-like theories
with quarks in a (pseudo)real representation of the gauge group using the
Nambu-Jona-Lasinio model. The gauge dynamics is modeled using a simple lattice
spin model with nearest-neighbor interactions. We first keep our discussion as
general as possible, and only later focus on theories with adjoint quarks of
two or three colors. Calculating the phase diagram in the plane of temperature
and quark chemical potential, it is qualitatively confirmed that the critical
temperature of the chiral phase transition is much higher than the
deconfinement transition temperature. At a chemical potential equal to half of
the diquark mass in the vacuum, a diquark Bose-Einstein condensation (BEC)
phase transition occurs. In the two-color case, a Ginzburg-Landau expansion is
used to study the tetracritical behavior around the intersection point of the
deconfinement and BEC transition lines, which are both of second order. We
obtain a compact expression for the expectation value of the Polyakov loop in
an arbitrary representation of the gauge group (for any number of colors),
which allows us to study Casimir scaling at both nonzero temperature and
chemical potential.
| [
{
"created": "Mon, 17 May 2010 14:16:09 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Jun 2010 12:56:16 GMT",
"version": "v2"
}
] | 2015-03-17 | [
[
"Zhang",
"Tian",
""
],
[
"Brauner",
"Tomas",
""
],
[
"Rischke",
"Dirk H.",
""
]
] | We investigate the properties of hot and/or dense matter in QCD-like theories with quarks in a (pseudo)real representation of the gauge group using the Nambu-Jona-Lasinio model. The gauge dynamics is modeled using a simple lattice spin model with nearest-neighbor interactions. We first keep our discussion as general as possible, and only later focus on theories with adjoint quarks of two or three colors. Calculating the phase diagram in the plane of temperature and quark chemical potential, it is qualitatively confirmed that the critical temperature of the chiral phase transition is much higher than the deconfinement transition temperature. At a chemical potential equal to half of the diquark mass in the vacuum, a diquark Bose-Einstein condensation (BEC) phase transition occurs. In the two-color case, a Ginzburg-Landau expansion is used to study the tetracritical behavior around the intersection point of the deconfinement and BEC transition lines, which are both of second order. We obtain a compact expression for the expectation value of the Polyakov loop in an arbitrary representation of the gauge group (for any number of colors), which allows us to study Casimir scaling at both nonzero temperature and chemical potential. |
2109.07482 | Jack Shergold | Jack D. Shergold | Updated detection prospects for relic neutrinos using coherent
scattering | 14 pages, 3 figures | JCAP 11 (2021), 052 | 10.1088/1475-7516/2021/11/052 | IPPP/21/28 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review the existing proposals to detect relic neutrinos using the coherent
scattering of a neutrino wind on a test mass. By considering the transformation
of the neutrino momentum between reference frames, we demonstrate that the
induced acceleration scales with the square of the neutrino mass for
unclustered neutrinos, contrary to the existing literature. In addition, we
show that there is a large contribution to this effect from coherent
neutrino-electron scattering, which can exceed the neutrino-nucleus component
by nearly an order of magnitude. Unfortunately, we find that even with this
enhancement there are no existing experiments or proposals capable of detecting
relic neutrinos using this method.
| [
{
"created": "Wed, 15 Sep 2021 18:00:02 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Nov 2021 09:12:24 GMT",
"version": "v2"
}
] | 2021-12-01 | [
[
"Shergold",
"Jack D.",
""
]
] | We review the existing proposals to detect relic neutrinos using the coherent scattering of a neutrino wind on a test mass. By considering the transformation of the neutrino momentum between reference frames, we demonstrate that the induced acceleration scales with the square of the neutrino mass for unclustered neutrinos, contrary to the existing literature. In addition, we show that there is a large contribution to this effect from coherent neutrino-electron scattering, which can exceed the neutrino-nucleus component by nearly an order of magnitude. Unfortunately, we find that even with this enhancement there are no existing experiments or proposals capable of detecting relic neutrinos using this method. |
hep-ph/0403190 | Xuelei Wang | Xuelei Wang, Wenna Xu, Linlin Du | The study of the charged top-pion decay processes | 14 pages, 6 figures | Commun.Theor.Phys. 41 (2004) 737-740 | 10.1088/0253-6102/41/5/737 | null | hep-ph | null | In the framework of top-color assisted technicolor(TC2) theory, we study the
four decay processes of charged top-pion, i.e.,
$\Pi^{+}_{t}\to t\bar{b}$, $\Pi^{+}_{t}\to c\bar{b}$, $\Pi^{+}_{t}\to
W^{+}\gamma$, $\Pi^{+}_{t}\to W^{+}Z^{0}$, the decay branching ratio of these
modes are calculated. The results show that the main decay channels of charged
top-pion are the tree level modes: $\Pi_t^+ \to t\bar{b}$ and $\Pi_t^+ \to
c\bar{b}$. Light $\Pi_t^+$ is easier to be detected than heavy one at future
coliders. So, the study provides us some useful information to search for
charged top-pion.
| [
{
"created": "Wed, 17 Mar 2004 09:43:35 GMT",
"version": "v1"
}
] | 2018-01-17 | [
[
"Wang",
"Xuelei",
""
],
[
"Xu",
"Wenna",
""
],
[
"Du",
"Linlin",
""
]
] | In the framework of top-color assisted technicolor(TC2) theory, we study the four decay processes of charged top-pion, i.e., $\Pi^{+}_{t}\to t\bar{b}$, $\Pi^{+}_{t}\to c\bar{b}$, $\Pi^{+}_{t}\to W^{+}\gamma$, $\Pi^{+}_{t}\to W^{+}Z^{0}$, the decay branching ratio of these modes are calculated. The results show that the main decay channels of charged top-pion are the tree level modes: $\Pi_t^+ \to t\bar{b}$ and $\Pi_t^+ \to c\bar{b}$. Light $\Pi_t^+$ is easier to be detected than heavy one at future coliders. So, the study provides us some useful information to search for charged top-pion. |
1309.3865 | Carlos Hidalgo-Duque | Feng-Kun Guo, Carlos Hidalgo-Duque, Juan Nieves, M. Pavon Valderrama | Heavy Quark Symmetries: Molecular Partners of the X(3872) and
$Z_{b}(10610)/Z_{b}'(10650)$ | 4 pages | null | 10.1142/S2010194514600738 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we have used an Effective Field Theory (EFT) framework based on
Heavy Quark Spin (HQSS), Heavy Flavour (HFS) and Heavy Antiquark-Diquark
symmetries (HADS). Using a standard lagrangian for the heavy meson-heavy
antimeson system, we fit the counter-terms of the model to predict some
promising experimental data that can be interpreted as heavy meson-heavy
antimeson molecules, that is, the X(3872) and the $Z_{b}(10610)/Z'_{b}(10650)$.
Next, and, taking advantage of HADS, we use the same lagrangian to explore the
consequences for heavy meson-doubly heavy baryon molecules, which can also be
interpreted as triply heavy pentaquarks.
| [
{
"created": "Mon, 16 Sep 2013 09:00:17 GMT",
"version": "v1"
}
] | 2015-06-17 | [
[
"Guo",
"Feng-Kun",
""
],
[
"Hidalgo-Duque",
"Carlos",
""
],
[
"Nieves",
"Juan",
""
],
[
"Valderrama",
"M. Pavon",
""
]
] | In this work, we have used an Effective Field Theory (EFT) framework based on Heavy Quark Spin (HQSS), Heavy Flavour (HFS) and Heavy Antiquark-Diquark symmetries (HADS). Using a standard lagrangian for the heavy meson-heavy antimeson system, we fit the counter-terms of the model to predict some promising experimental data that can be interpreted as heavy meson-heavy antimeson molecules, that is, the X(3872) and the $Z_{b}(10610)/Z'_{b}(10650)$. Next, and, taking advantage of HADS, we use the same lagrangian to explore the consequences for heavy meson-doubly heavy baryon molecules, which can also be interpreted as triply heavy pentaquarks. |
1007.0351 | Juan Rojo | J. Rojo, G. Ridolfi, R. D. Ball, V. Bertone, F. Cerutti, L. Del
Debbio, S. Forte, A. Guffanti, J. I. Latorre, M. Ubiali | Progress in the Neural Network Determination of Polarized Parton
Distributions | 5 pages, 2 figures; to appear in the proceedings of DIS 2010, Firenze | PoS DIS2010:244,2010 | null | FREIBURG-PHENO-2010-022 | hep-ph hep-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review recent progress towards a determination of a set of polarized
parton distributions from a global set of deep-inelastic scattering data based
on the NNPDF methodology, in analogy with the unpolarized case. This method is
designed to provide a faithful and statistically sound representation of parton
distributions and their uncertainties. We show how the FastKernel method
provides a fast and accurate method for solving the polarized DGLAP equations.
We discuss the polarized PDF parametrizations and the physical constraints
which can be imposed. Preliminary results suggest that the uncertainty on
polarized PDFs, most notably the gluon, has been underestimated in previous
studies.
| [
{
"created": "Fri, 2 Jul 2010 12:31:13 GMT",
"version": "v1"
}
] | 2010-11-19 | [
[
"Rojo",
"J.",
""
],
[
"Ridolfi",
"G.",
""
],
[
"Ball",
"R. D.",
""
],
[
"Bertone",
"V.",
""
],
[
"Cerutti",
"F.",
""
],
[
"Del Debbio",
"L.",
""
],
[
"Forte",
"S.",
""
],
[
"Guffanti",
"A.",
""
],
[
"Latorre",
"J. I.",
""
],
[
"Ubiali",
"M.",
""
]
] | We review recent progress towards a determination of a set of polarized parton distributions from a global set of deep-inelastic scattering data based on the NNPDF methodology, in analogy with the unpolarized case. This method is designed to provide a faithful and statistically sound representation of parton distributions and their uncertainties. We show how the FastKernel method provides a fast and accurate method for solving the polarized DGLAP equations. We discuss the polarized PDF parametrizations and the physical constraints which can be imposed. Preliminary results suggest that the uncertainty on polarized PDFs, most notably the gluon, has been underestimated in previous studies. |
1009.3107 | Hagop Sazdjian | H. Sazdjian | Properties of the gauge invariant quark Green's function in
two-dimensional QCD | 3 pages, 2 figures. Talk given at the Conference QCD 10, 28 June - 2
July 2010, Montpellier, France | Nucl.Phys.Proc.Suppl.207-208:341-343,2010 | 10.1016/j.nuclphysbps.2010.10.084 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using an exact integrodifferential equation we study the properties of the
gauge invariant quark Green's function, defined with a path-ordered gluon field
phase factor along a straight line, in two-dimensional QCD in the large-N_c
limit. The Green's function is found to be infrared finite with singularities
represented by an infinite number of threshold type branch points with a power
equal to -3/2, starting at positive mass squared values. The solution is
analytically determined.
| [
{
"created": "Thu, 16 Sep 2010 07:14:42 GMT",
"version": "v1"
}
] | 2011-02-11 | [
[
"Sazdjian",
"H.",
""
]
] | Using an exact integrodifferential equation we study the properties of the gauge invariant quark Green's function, defined with a path-ordered gluon field phase factor along a straight line, in two-dimensional QCD in the large-N_c limit. The Green's function is found to be infrared finite with singularities represented by an infinite number of threshold type branch points with a power equal to -3/2, starting at positive mass squared values. The solution is analytically determined. |
0902.2639 | Adam Bzdak | Adam Bzdak | Forward-backward multiplicity correlations in the wounded nucleon model | 15 pages, 4 figures, accepted for publication in Phys. Rev. C.
Changed content: STAR data included, extended discussion, added references | Phys.Rev.C80:024906,2009 | 10.1103/PhysRevC.80.024906 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The forward-backward multiplicity correlation strength is calculated for
arbitrary nucleus-nucleus collision in the framework of the wounded nucleon
model. Discussion of our results in the context of the recent STAR data in
Au+Au collisions at sqrt{s}=200 GeV is presented. It is suggested that the
observed (i) growth of the correlation coefficient with centrality and (ii)
approximately flat pseudorapidity dependence of the correlation strength for
central collisions are due to the fluctuations of the number of wounded
nucleons at a given centrality bin.
| [
{
"created": "Mon, 16 Feb 2009 09:28:08 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Aug 2009 12:40:24 GMT",
"version": "v2"
}
] | 2009-09-02 | [
[
"Bzdak",
"Adam",
""
]
] | The forward-backward multiplicity correlation strength is calculated for arbitrary nucleus-nucleus collision in the framework of the wounded nucleon model. Discussion of our results in the context of the recent STAR data in Au+Au collisions at sqrt{s}=200 GeV is presented. It is suggested that the observed (i) growth of the correlation coefficient with centrality and (ii) approximately flat pseudorapidity dependence of the correlation strength for central collisions are due to the fluctuations of the number of wounded nucleons at a given centrality bin. |
1910.03707 | Wojciech Broniowski | Wojciech Broniowski, Enrique Ruiz Arriola | Double parton distribution of valence quarks in the pion in chiral quark
models | discussion added, typos corrected, 12 pages, 6 figures | Phys. Rev. D 101, 014019 (2020) | 10.1103/PhysRevD.101.014019 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The valence double parton distribution of the pion is analyzed in the
framework of chiral quark models, where in the chiral limit factorization
between the longitudinal and transverse degrees of freedom occurs. This feature
leads, at the quark-model scale, to a particularly simple distribution of the
form $D(x_1,x_2, \vec{q}) = \delta(1-x_1-x_2) F(\vec{q})$, where $x_{1,2}$ are
the longitudinal momentum fractions carried the valence quark and antiquark and
$\vec{q}$ is their relative transverse momentum. For $\vec{q}=\vec{0}$ this
result complies immediately to the Gaunt-Sterling sum rules. The DGLAP
evolution to higher scales is carried out in terms of the Mellin moments. We
then explore its role on the longitudinal correlation quantified with the ratio
of the double distribution to the product of single distributions, $D(x_1,x_2,
\vec{q}=\vec{0})/D(x_1)D(x_2)$. We point out that the ratios of moments
$\langle x_1^n x_2^m \rangle / \langle x_1^n \rangle \langle x_2^m \rangle $
are independent of the evolution, providing particularly suitable measures to
be tested in the upcoming lattice simulations. The transverse form factor
$F(\vec{q})$ and its Fourier conjugate in the relative transverse coordinate
$\vec{b}$ are obtained in variants of the Nambu--Jona-Lasinio model with the
spectral and Pauli-Villars regularizations.The results are valid in the
soft-momentum domain. Interestingly, with the spectral regularization of the
model, the effective cross section for the double parton scattering of pions is
exactly equal to the geometric cross section, $\sigma_{\rm eff}=\pi \langle
\vec{b}^2 \rangle$ and yields about 20~mb.
| [
{
"created": "Tue, 8 Oct 2019 22:26:16 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Jan 2020 11:22:17 GMT",
"version": "v2"
}
] | 2020-01-29 | [
[
"Broniowski",
"Wojciech",
""
],
[
"Arriola",
"Enrique Ruiz",
""
]
] | The valence double parton distribution of the pion is analyzed in the framework of chiral quark models, where in the chiral limit factorization between the longitudinal and transverse degrees of freedom occurs. This feature leads, at the quark-model scale, to a particularly simple distribution of the form $D(x_1,x_2, \vec{q}) = \delta(1-x_1-x_2) F(\vec{q})$, where $x_{1,2}$ are the longitudinal momentum fractions carried the valence quark and antiquark and $\vec{q}$ is their relative transverse momentum. For $\vec{q}=\vec{0}$ this result complies immediately to the Gaunt-Sterling sum rules. The DGLAP evolution to higher scales is carried out in terms of the Mellin moments. We then explore its role on the longitudinal correlation quantified with the ratio of the double distribution to the product of single distributions, $D(x_1,x_2, \vec{q}=\vec{0})/D(x_1)D(x_2)$. We point out that the ratios of moments $\langle x_1^n x_2^m \rangle / \langle x_1^n \rangle \langle x_2^m \rangle $ are independent of the evolution, providing particularly suitable measures to be tested in the upcoming lattice simulations. The transverse form factor $F(\vec{q})$ and its Fourier conjugate in the relative transverse coordinate $\vec{b}$ are obtained in variants of the Nambu--Jona-Lasinio model with the spectral and Pauli-Villars regularizations.The results are valid in the soft-momentum domain. Interestingly, with the spectral regularization of the model, the effective cross section for the double parton scattering of pions is exactly equal to the geometric cross section, $\sigma_{\rm eff}=\pi \langle \vec{b}^2 \rangle$ and yields about 20~mb. |
hep-ph/0109168 | Lorenzo Magnea | Lorenzo Magnea | Analytic resummation and power corrections for DIS and Drell--Yan | 6 pages, talk delivered at DIS 2001, Bologna (Italy), 27/4-1/5 2001 | null | 10.1142/9789812778345_0038 | null | hep-ph | null | Dimensional continuation is applied to resummed expressions for the DIS and
Drell-Yan partonic cross sections, to regularize the Landau pole. Simple
analytic expression are obtained, encoding information about nonperturbative
power--suppressed effects.
| [
{
"created": "Wed, 19 Sep 2001 14:24:25 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Magnea",
"Lorenzo",
""
]
] | Dimensional continuation is applied to resummed expressions for the DIS and Drell-Yan partonic cross sections, to regularize the Landau pole. Simple analytic expression are obtained, encoding information about nonperturbative power--suppressed effects. |
1802.01102 | Carlos Louren\c{c}o | Pietro Faccioli, Carlos Lourenco, Mariana Araujo, Joao Seixas | Universal kinematic scaling as a probe of factorized long-distance
effects in high-energy quarkonium production | Submitted to European Physical Journal C | null | 10.1140/epjc/s10052-018-5610-x | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Dimensional analysis reveals general kinematic scaling rules for the
momentum, mass, and energy dependence of Drell-Yan and quarkonium cross
sections. Their application to mid-rapidity LHC data provides strong
experimental evidence supporting the validity of the factorization ansatz, a
cornerstone of non-relativistic QCD, still lacking theoretical demonstration.
Moreover, data-driven patterns emerge for the factorizable long-distance
bound-state formation effects, including a remarkable correlation between the
S-wave quarkonium cross sections and their binding energies. Assuming that this
scaling can be extended to the P-wave case, we obtain precise predictions for
the not yet measured feed-down fractions, thereby providing a complete picture
of the charmonium and bottomonium feed-down structure. This is crucial
information for quantitative interpretations of quarkonium production data,
including studies of the suppression patterns measured in nucleus-nucleus
collisions.
| [
{
"created": "Sun, 4 Feb 2018 10:17:59 GMT",
"version": "v1"
}
] | 2018-04-04 | [
[
"Faccioli",
"Pietro",
""
],
[
"Lourenco",
"Carlos",
""
],
[
"Araujo",
"Mariana",
""
],
[
"Seixas",
"Joao",
""
]
] | Dimensional analysis reveals general kinematic scaling rules for the momentum, mass, and energy dependence of Drell-Yan and quarkonium cross sections. Their application to mid-rapidity LHC data provides strong experimental evidence supporting the validity of the factorization ansatz, a cornerstone of non-relativistic QCD, still lacking theoretical demonstration. Moreover, data-driven patterns emerge for the factorizable long-distance bound-state formation effects, including a remarkable correlation between the S-wave quarkonium cross sections and their binding energies. Assuming that this scaling can be extended to the P-wave case, we obtain precise predictions for the not yet measured feed-down fractions, thereby providing a complete picture of the charmonium and bottomonium feed-down structure. This is crucial information for quantitative interpretations of quarkonium production data, including studies of the suppression patterns measured in nucleus-nucleus collisions. |
2008.11133 | Rene Poncelet | Michal Czakon, Alexander Mitov and Rene Poncelet | NNLO QCD corrections to leptonic observables in top-quark pair
production and decay | 49 pages, 94 figures, published version, minor changes in the figures
and text | null | 10.1007/JHEP05(2021)212 | TTK-20-25, Cavendish-HEP-20/07 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate a comprehensive set of spin correlations and differential
distributions in top-quark pair production and decay to dilepton final states.
This is the first time such a complete study is performed at next-to-next-to
leading order in QCD. Both inclusive and fiducial distributions are presented
and analyzed. Good agreement between NNLO QCD predictions and data is found. We
demonstrate that it is possible to perform high-precision comparisons of
fixed-order calculations with fiducial-level data. Subtleties of the top quark
definition are raised and clarified. Some of those are found to have a very
significant impact on top-quark pair production at absolute threshold.
| [
{
"created": "Tue, 25 Aug 2020 16:04:26 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Aug 2021 07:58:41 GMT",
"version": "v2"
}
] | 2023-01-11 | [
[
"Czakon",
"Michal",
""
],
[
"Mitov",
"Alexander",
""
],
[
"Poncelet",
"Rene",
""
]
] | We calculate a comprehensive set of spin correlations and differential distributions in top-quark pair production and decay to dilepton final states. This is the first time such a complete study is performed at next-to-next-to leading order in QCD. Both inclusive and fiducial distributions are presented and analyzed. Good agreement between NNLO QCD predictions and data is found. We demonstrate that it is possible to perform high-precision comparisons of fixed-order calculations with fiducial-level data. Subtleties of the top quark definition are raised and clarified. Some of those are found to have a very significant impact on top-quark pair production at absolute threshold. |
1712.06459 | Zhun Lu | Yongliang Yang and Zhun Lu | The electromagnetic form factors of $\Lambda$ hyperon in
$e^+e^-\rightarrow \bar\Lambda\Lambda$ | 5 pages, 3 figures | null | 10.1142/S021773231850133X | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the electromagnetic form factors of $\Lambda$ hyperon in the
timelike region using the recent experimental data in the exclusive production
of $\bar{\Lambda} \Lambda$ pair in electron-position annihilation. We present a
pQCD inspired parametrization of $G_E(s)$ and $G_M(s)$ with only two
parameters, and we consider a suppression mechanism of the electric form factor
$G_E(s)$ compared to the magnetic form factor $G_M(s)$. The parameters are
determined through fitting our parametrization to the effective form factor
data in the reaction $e^+e^-\rightarrow \bar\Lambda\Lambda$. Except the
threshold region, our parametrization can reproduce satisfactorily the known
behavior of the existing data from the BarBar, DM2 and BESIII Collaborations.
We also predict the double spin polarization observables $A_{xx}$, $A_{yy}$ and
$A_{zz}$ in $e^+e^-\rightarrow \bar\Lambda\Lambda$.
| [
{
"created": "Mon, 18 Dec 2017 15:14:21 GMT",
"version": "v1"
}
] | 2018-08-15 | [
[
"Yang",
"Yongliang",
""
],
[
"Lu",
"Zhun",
""
]
] | We study the electromagnetic form factors of $\Lambda$ hyperon in the timelike region using the recent experimental data in the exclusive production of $\bar{\Lambda} \Lambda$ pair in electron-position annihilation. We present a pQCD inspired parametrization of $G_E(s)$ and $G_M(s)$ with only two parameters, and we consider a suppression mechanism of the electric form factor $G_E(s)$ compared to the magnetic form factor $G_M(s)$. The parameters are determined through fitting our parametrization to the effective form factor data in the reaction $e^+e^-\rightarrow \bar\Lambda\Lambda$. Except the threshold region, our parametrization can reproduce satisfactorily the known behavior of the existing data from the BarBar, DM2 and BESIII Collaborations. We also predict the double spin polarization observables $A_{xx}$, $A_{yy}$ and $A_{zz}$ in $e^+e^-\rightarrow \bar\Lambda\Lambda$. |
1812.06012 | Mureed Hussain | Mureed Hussain and Rizwan Khalid | Yukawa Unification with light supersymmetric particles consistent with
LHC constraints | 18 pages, 5 sets of figures. Some linguistic paraphrasing. Results
are same as in the previous version | null | 10.1016/j.nuclphysb.2019.03.007 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate supersymmetric models with left-right symmetry based on the
group $SU(4)_{c} \times SU(2)_{L} \times SU(2)_{R}$ ($4$-$2$-$2$) with negative
sign of bilinear Higgs potential parameter $\mu$ in the context of the latest
experimental results. In the backdrop of experimental results from the Large
Hadron Collider, we investigate the possibility of Yukawa unification in
$4$-$2$-$2$ and find out the same is still not ruled out. Furthermore, this
scenario also provides a satisfactory dark matter candidate. The current
experimental bounds on sparticle masses, mass bounds on Higgs particle, updated
phenomenological constraints from the rare decays of B meson and the anomalous
magnetic moment of muon with the requirement of a Yukawa unified theory having
$10 \%$ or better third family Yukawa unification are utilized to bound the
parametric space of these models.
| [
{
"created": "Thu, 13 Dec 2018 18:50:32 GMT",
"version": "v1"
},
{
"created": "Thu, 24 Jan 2019 12:05:31 GMT",
"version": "v2"
}
] | 2019-05-01 | [
[
"Hussain",
"Mureed",
""
],
[
"Khalid",
"Rizwan",
""
]
] | We investigate supersymmetric models with left-right symmetry based on the group $SU(4)_{c} \times SU(2)_{L} \times SU(2)_{R}$ ($4$-$2$-$2$) with negative sign of bilinear Higgs potential parameter $\mu$ in the context of the latest experimental results. In the backdrop of experimental results from the Large Hadron Collider, we investigate the possibility of Yukawa unification in $4$-$2$-$2$ and find out the same is still not ruled out. Furthermore, this scenario also provides a satisfactory dark matter candidate. The current experimental bounds on sparticle masses, mass bounds on Higgs particle, updated phenomenological constraints from the rare decays of B meson and the anomalous magnetic moment of muon with the requirement of a Yukawa unified theory having $10 \%$ or better third family Yukawa unification are utilized to bound the parametric space of these models. |
1108.3143 | Fernando Navarra | E.R. Cazaroto, V.P. Goncalves and F.S. Navarra | Heavy quark production at LHC in the color dipole formalism | 10 pages, 8 figures | null | 10.1016/j.nuclphysa.2011.09.017 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we estimate the heavy quark production in proton-proton and
proton-nucleus collisions at LHC energies using the color dipole formalism and
the solution of the running coupling Balitsky-Kovchegov equation. Nuclear
effects are considered in the computation of the total cross sections and
rapidity distributions for scattering on protons and nuclei.
| [
{
"created": "Tue, 16 Aug 2011 02:21:28 GMT",
"version": "v1"
}
] | 2015-05-30 | [
[
"Cazaroto",
"E. R.",
""
],
[
"Goncalves",
"V. P.",
""
],
[
"Navarra",
"F. S.",
""
]
] | In this work we estimate the heavy quark production in proton-proton and proton-nucleus collisions at LHC energies using the color dipole formalism and the solution of the running coupling Balitsky-Kovchegov equation. Nuclear effects are considered in the computation of the total cross sections and rapidity distributions for scattering on protons and nuclei. |
hep-ph/9405391 | null | Thomas G. Rizzo | Probing Anomalous Chromomagnetic Top Quark Couplings at the NLC | 15 pages, 12 figures(available on request), LaTex, SLAC-PUB-6512 | Phys.Rev. D50 (1994) 4478-4484 | 10.1103/PhysRevD.50.4478 | null | hep-ph | null | The Next Linear Collider(NLC) will provide a excellent tool for probing the
detailed nature of the top quark. By extending the recent analysis of
Dokshitzer, Khoze and Sterling, we perform a preliminary examination of the
influence of an anomalous chromomagnetic moment for the top, $\kappa$, on the
spectrum of gluon radiation associated with $t\bar t$ production. In
particular, we analyze the sensitivity of future data to non-zero values of
$\kappa$ and estimate the limits that can be placed on this parameter at the
NLC with center of mass energies $\sqrt {s}=$ 500 and 1000 GeV.
| [
{
"created": "Thu, 26 May 1994 19:30:38 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Rizzo",
"Thomas G.",
""
]
] | The Next Linear Collider(NLC) will provide a excellent tool for probing the detailed nature of the top quark. By extending the recent analysis of Dokshitzer, Khoze and Sterling, we perform a preliminary examination of the influence of an anomalous chromomagnetic moment for the top, $\kappa$, on the spectrum of gluon radiation associated with $t\bar t$ production. In particular, we analyze the sensitivity of future data to non-zero values of $\kappa$ and estimate the limits that can be placed on this parameter at the NLC with center of mass energies $\sqrt {s}=$ 500 and 1000 GeV. |
hep-ph/9802270 | Haris Kosmas | J.D. Vergados and T.S. Kosmas | Searching for Cold Dark Matter. A case of coexistence of Supersymmetry
and Nuclear Physics | 23 LATEX pages, 5 figures (Fig. 1 and Fig 2. available on request,
Figs. 3-5 PS-form included), 6 Tables (Tables 2, 4, 5 with two parts (a) and
(b)). Sov. J. of Nucl. Phys., to appear | Phys.Atom.Nucl.61:1066-1080,1998 | null | null | hep-ph | null | The direct detection rate for supersymmetric cold dark matter (CDM) particles
is calculated for a number of suitable nuclear targets. Both the coherent and
spin contributions are considered. By considering representative
phenomenologically acceptable input in the restricted SUSY parameter space,
detectable rates are predicted for some choices of the parameters. The
modulation effect, due to the Earth's annual motion, has also been considered
and found to be $\le 4%$. Its precise value depends on the mass of CDM
particles (LSP) and the structure of the target.
| [
{
"created": "Mon, 9 Feb 1998 07:20:51 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Feb 1998 11:23:13 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Vergados",
"J. D.",
""
],
[
"Kosmas",
"T. S.",
""
]
] | The direct detection rate for supersymmetric cold dark matter (CDM) particles is calculated for a number of suitable nuclear targets. Both the coherent and spin contributions are considered. By considering representative phenomenologically acceptable input in the restricted SUSY parameter space, detectable rates are predicted for some choices of the parameters. The modulation effect, due to the Earth's annual motion, has also been considered and found to be $\le 4%$. Its precise value depends on the mass of CDM particles (LSP) and the structure of the target. |
hep-ph/0106026 | Theodore J. Allen | Theodore J. Allen, Charles Goebel, M. G. Olsson, Sinisa Veseli | Analytic Quantization of the QCD String | RevTeX, 10 pages, 9 figures | Phys.Rev.D64:094011,2001 | 10.1103/PhysRevD.64.094011 | null | hep-ph | null | We perform an analytic semi-classical quantization of the straight QCD string
with one end fixed and a massless quark on the other, in the limits of orbital
and radial dominant motion. We compare our results to the exact numerical
semi-classical quantization. We observe that the numerical semi-classical
quantization agrees well with our exact numerical canonical quantization.
| [
{
"created": "Sat, 2 Jun 2001 19:35:44 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Allen",
"Theodore J.",
""
],
[
"Goebel",
"Charles",
""
],
[
"Olsson",
"M. G.",
""
],
[
"Veseli",
"Sinisa",
""
]
] | We perform an analytic semi-classical quantization of the straight QCD string with one end fixed and a massless quark on the other, in the limits of orbital and radial dominant motion. We compare our results to the exact numerical semi-classical quantization. We observe that the numerical semi-classical quantization agrees well with our exact numerical canonical quantization. |
hep-ph/0011294 | Leonid Glozman | L.Ya. Glozman | Point form relativistic quantum mechanics, antiparticles and exchange
currents | 8 pp, 2 figs, LaTeX | null | null | null | hep-ph hep-lat hep-th nucl-th | null | It is shown that the dynamical observables calculated with the point form
relativistic quantum mechanics incorporate effects of particle-antiparticle
creation from the vacuum by interactions. The electromagnetic observables
obtained with the point form impulse approximation include contributions from
the ``pair'' exchange currents that are associated with the interactions
between particles. This implies that the recently calculated nucleon
electromagnetic formfactors with the chiral constituent quark model
automatically take into account effects of ``pair'' exchange currents that are
associated with the Goldstone boson exchange between the constituent quarks as
well as with the confining interaction.
| [
{
"created": "Thu, 23 Nov 2000 16:21:37 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Glozman",
"L. Ya.",
""
]
] | It is shown that the dynamical observables calculated with the point form relativistic quantum mechanics incorporate effects of particle-antiparticle creation from the vacuum by interactions. The electromagnetic observables obtained with the point form impulse approximation include contributions from the ``pair'' exchange currents that are associated with the interactions between particles. This implies that the recently calculated nucleon electromagnetic formfactors with the chiral constituent quark model automatically take into account effects of ``pair'' exchange currents that are associated with the Goldstone boson exchange between the constituent quarks as well as with the confining interaction. |
hep-ph/9512376 | Oleg Teryaev | A.V. Belitsky, O.V. Teryaev | QCD Sum Rules Calculation of the Singlet Axial Constant | LATEX, 21 pages, 2 figures included into the file; to be published in
Phys. Atom. Nucl. The higher twist bilocal power corrections are taken into
account and continuum subtraction is reanalyzed. The corresponding change of
singlet axial constant is within the experimental and theoretical errors | Phys.Atom.Nucl. 60 (1997) 455-464; Yad.Fiz. 60N3 (1997) 529-538 | null | JINR Prepint E2-95-374 | hep-ph | null | We analyze the singlet axial form factor of the proton for small momentum
transferred in the framework of QCD sum rules using the interpolating nucleon
current which explicitly accounts for the gluonic degrees of freedom. As a
result we come to the quantitative description of the singlet axial constant:
G_A(0)=0.2. The bilocal power corrections play the most important role in the
analysis.
| [
{
"created": "Wed, 20 Dec 1995 21:56:52 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Apr 1996 15:44:14 GMT",
"version": "v2"
}
] | 2008-02-03 | [
[
"Belitsky",
"A. V.",
""
],
[
"Teryaev",
"O. V.",
""
]
] | We analyze the singlet axial form factor of the proton for small momentum transferred in the framework of QCD sum rules using the interpolating nucleon current which explicitly accounts for the gluonic degrees of freedom. As a result we come to the quantitative description of the singlet axial constant: G_A(0)=0.2. The bilocal power corrections play the most important role in the analysis. |
hep-ph/0507124 | Mar Bastero-Gil | Mar Bastero-Gil and Arjun Berera | Sneutrino warm inflation in the minimal supersymmetric model | 10 pages, 1 eps figure, revtex4 | Phys.Rev.D72:103526,2005 | 10.1103/PhysRevD.72.103526 | UG-FT-191/05, CAFPE-61/05 | hep-ph astro-ph gr-qc hep-th | null | The model of RH neutrino fields coupled to the MSSM is shown to yield a large
parameter regime of warm inflation. In the strong dissipative regime, it is
shown that inflation, driven by a single sneutrino field, occurs with {\it all
field amplitudes below the Planck scale}. Analysis is also made of
leptogenesis, neutrino mass generation and gravitino constraints. A new warm
inflation scenario is purposed in which one scalar field drives a period of
warm inflation and a second field drives a subsequent phase of reheating. Such
a model is able to reduce the final temperature after inflation, thus helping
to mitigate gravitino constraints.
| [
{
"created": "Mon, 11 Jul 2005 11:31:08 GMT",
"version": "v1"
}
] | 2011-08-17 | [
[
"Bastero-Gil",
"Mar",
""
],
[
"Berera",
"Arjun",
""
]
] | The model of RH neutrino fields coupled to the MSSM is shown to yield a large parameter regime of warm inflation. In the strong dissipative regime, it is shown that inflation, driven by a single sneutrino field, occurs with {\it all field amplitudes below the Planck scale}. Analysis is also made of leptogenesis, neutrino mass generation and gravitino constraints. A new warm inflation scenario is purposed in which one scalar field drives a period of warm inflation and a second field drives a subsequent phase of reheating. Such a model is able to reduce the final temperature after inflation, thus helping to mitigate gravitino constraints. |
2008.00990 | Vladimir A. Petrov | Vladimir A. Petrov | On the " Froissaron-Maximal Odderon" Model | null | Eur. Phys. J. C. (2021) 81:670 | 10.1140/epjc/s10052-021-09465-2 | 2008.00990 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyse the basic premises of the `` Froissaron-Maximal Odderon" (FMO)
model which was claimed to be ``the only existing model which describes the
totality of experimental data ". It is shown that the FMO model suffers from
serious theoretical flaws while its quality of the data description is such
that the probability that it describes the selected set of data is not
satisfactory enough.
| [
{
"created": "Mon, 3 Aug 2020 16:18:59 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Aug 2021 13:10:41 GMT",
"version": "v2"
}
] | 2021-08-06 | [
[
"Petrov",
"Vladimir A.",
""
]
] | We analyse the basic premises of the `` Froissaron-Maximal Odderon" (FMO) model which was claimed to be ``the only existing model which describes the totality of experimental data ". It is shown that the FMO model suffers from serious theoretical flaws while its quality of the data description is such that the probability that it describes the selected set of data is not satisfactory enough. |
hep-ph/0012284 | Parthasarathi Mitra | H. Banerjee, D. Chatterjee and P. Mitra | Is there still a strong CP problem? | 6 pages, REVTeX; brief discussion available at
http://theory.saha.ernet.in/~mitra/scp.html | Phys.Lett. B573 (2003) 109 | 10.1016/j.physletb.2003.08.058 | null | hep-ph hep-lat hep-th | null | The role of a chiral U(1) phase in the quark mass in QCD is analysed from
first principles. In operator formulation, there is a parity symmetry and the
phase can be removed by a change in the representation of the Dirac gamma
matrices. Moreover, these properties are also realized in a Pauli-Villars
regularized version of the theory. In the functional integral scenario,
attempts to remove the chiral phase by a chiral transformation are thought to
be obstructed by a nontrivial Jacobian arising from the fermion measure and the
chiral phase may therefore seem to break parity. But if one starts from the
regularized action with the chiral phase also present in the regulator mass
term, the Jacobian for a combined chiral rotation of quarks and regulators is
seen to be trivial and the phase can be removed by a combined chiral rotation.
This amounts to a taming of the strong CP problem.
| [
{
"created": "Thu, 21 Dec 2000 12:37:40 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Feb 2001 11:52:11 GMT",
"version": "v2"
},
{
"created": "Wed, 11 Jul 2001 09:17:08 GMT",
"version": "v3"
},
{
"created": "Tue, 16 Sep 2003 11:22:02 GMT",
"version": "v4"
}
] | 2015-06-25 | [
[
"Banerjee",
"H.",
""
],
[
"Chatterjee",
"D.",
""
],
[
"Mitra",
"P.",
""
]
] | The role of a chiral U(1) phase in the quark mass in QCD is analysed from first principles. In operator formulation, there is a parity symmetry and the phase can be removed by a change in the representation of the Dirac gamma matrices. Moreover, these properties are also realized in a Pauli-Villars regularized version of the theory. In the functional integral scenario, attempts to remove the chiral phase by a chiral transformation are thought to be obstructed by a nontrivial Jacobian arising from the fermion measure and the chiral phase may therefore seem to break parity. But if one starts from the regularized action with the chiral phase also present in the regulator mass term, the Jacobian for a combined chiral rotation of quarks and regulators is seen to be trivial and the phase can be removed by a combined chiral rotation. This amounts to a taming of the strong CP problem. |
2106.13923 | Fernando Iguaz\'u Ram\'irez-Zavaleta | J. Montano-Dominguez, B. Quezadas-Vivian, F. Ramirez-Zavaleta, E. S.
Tututi and E. Urquiza-Trejo | Off-shell chromomagnetic dipole moments in the SM at and beyond the $Z$
gauge boson mass scale | 16 pages, 5 figures | null | 10.1142/S0217751X23500719 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The off-shell anomalous chromomagnetic dipole moment of the standard model
quarks ($u$, $d$, $s$, $c$ and $b$), at the $Z$ gauge boson mass scale, is
computed by using the $\overline{\textrm{MS}}$ scheme. The numerical results
disagree with all the previous predictions reported in the literature and show
a discrepancy of up to two orders of magnitude in certain situations.
| [
{
"created": "Sat, 26 Jun 2021 01:56:22 GMT",
"version": "v1"
}
] | 2023-07-26 | [
[
"Montano-Dominguez",
"J.",
""
],
[
"Quezadas-Vivian",
"B.",
""
],
[
"Ramirez-Zavaleta",
"F.",
""
],
[
"Tututi",
"E. S.",
""
],
[
"Urquiza-Trejo",
"E.",
""
]
] | The off-shell anomalous chromomagnetic dipole moment of the standard model quarks ($u$, $d$, $s$, $c$ and $b$), at the $Z$ gauge boson mass scale, is computed by using the $\overline{\textrm{MS}}$ scheme. The numerical results disagree with all the previous predictions reported in the literature and show a discrepancy of up to two orders of magnitude in certain situations. |
1311.4607 | Alberto Mart\'inez Torres | A. Martinez Torres, K. P. Khemchandani, M. Nielsen, F. S. Navarra, E.
Oset | Study of the $D^*\rho$ system using QCD sum rules | Contribution to the proceedings of the XXXVI Reuni\~ao de Trabalho
sobre F\'isica Nuclear no Brasil, Maresias, S\~ao Paulo, Brazil | null | 10.1063/1.4901765 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this talk I present a study of the $D^* \rho$ system made by using the
method of QCD sum rules. Considering isospin and spin projectors, we
investigate the different configurations and obtain three $D^*$ mesons with
isospin $I=1/2$, spin $S=0$, $1$, $2$ and with masses $2500\pm 67$ MeV,
$2523\pm60$ MeV, and $2439\pm119$ MeV, respectively. The last state can be
related to $D^*_2(2460)$ (spin 2) listed by the Particle Data Group, while one
of the first two might be associated with $D^*(2640)$, whose spin-parity is
unknown. In the case of $I=3/2$ we also find evidences of three states with
spin 0, 1 and 2, respectively, with masses $2467\pm82$ MeV, $2420\pm128$ MeV,
and $2550\pm56$ MeV.
| [
{
"created": "Tue, 19 Nov 2013 02:12:05 GMT",
"version": "v1"
}
] | 2015-06-17 | [
[
"Torres",
"A. Martinez",
""
],
[
"Khemchandani",
"K. P.",
""
],
[
"Nielsen",
"M.",
""
],
[
"Navarra",
"F. S.",
""
],
[
"Oset",
"E.",
""
]
] | In this talk I present a study of the $D^* \rho$ system made by using the method of QCD sum rules. Considering isospin and spin projectors, we investigate the different configurations and obtain three $D^*$ mesons with isospin $I=1/2$, spin $S=0$, $1$, $2$ and with masses $2500\pm 67$ MeV, $2523\pm60$ MeV, and $2439\pm119$ MeV, respectively. The last state can be related to $D^*_2(2460)$ (spin 2) listed by the Particle Data Group, while one of the first two might be associated with $D^*(2640)$, whose spin-parity is unknown. In the case of $I=3/2$ we also find evidences of three states with spin 0, 1 and 2, respectively, with masses $2467\pm82$ MeV, $2420\pm128$ MeV, and $2550\pm56$ MeV. |
2206.11282 | Zoltan Ligeti | Florian U. Bernlochner, Zoltan Ligeti, Michele Papucci, Dean J.
Robinson | Interpreting LHCb's $\Lambda_b\to \Lambda_c\tau\bar\nu$ measurement and
puzzles in semileptonic $\Lambda_b$ decays | 3 pages | null | 10.1103/PhysRevD.107.L011502 | CALT-TH-2022-023 | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Normalizing the recent LHCb measurement of $\Lambda_b \to \Lambda_c \tau
\bar\nu$ to the standard model (SM) prediction for the $\Lambda_b \to \Lambda_c
\mu \bar\nu$ rate, instead of a LEP measurement, provides a more consistent
comparison with the SM prediction for the lepton flavor universality ratio
$R(\Lambda_c)$. This modestly increases $R(\Lambda_c)$ compared to the quoted
LHCb result, such that it no longer hints at a suppression compared to the SM,
which would be hard to accommodate in new physics scenarios that enhance
$R(D^{(*)})$. We point out that the fraction of excited states in inclusive
semileptonic $\Lambda_b$ decay may be significantly greater than the
corresponding fraction in $B$ decays. Possible implications are speculated
upon.
| [
{
"created": "Wed, 22 Jun 2022 18:00:07 GMT",
"version": "v1"
}
] | 2023-01-25 | [
[
"Bernlochner",
"Florian U.",
""
],
[
"Ligeti",
"Zoltan",
""
],
[
"Papucci",
"Michele",
""
],
[
"Robinson",
"Dean J.",
""
]
] | Normalizing the recent LHCb measurement of $\Lambda_b \to \Lambda_c \tau \bar\nu$ to the standard model (SM) prediction for the $\Lambda_b \to \Lambda_c \mu \bar\nu$ rate, instead of a LEP measurement, provides a more consistent comparison with the SM prediction for the lepton flavor universality ratio $R(\Lambda_c)$. This modestly increases $R(\Lambda_c)$ compared to the quoted LHCb result, such that it no longer hints at a suppression compared to the SM, which would be hard to accommodate in new physics scenarios that enhance $R(D^{(*)})$. We point out that the fraction of excited states in inclusive semileptonic $\Lambda_b$ decay may be significantly greater than the corresponding fraction in $B$ decays. Possible implications are speculated upon. |
hep-ph/0605081 | Hiroaki Abuki | H. Abuki (Kyoto U., Yukawa Inst., Kyoto and INFN, Bari) | BCS/BEC crossover in Quark Matter and Evolution of its Static and
Dynamic properties | (v3) 30 pages, 15 figures; discussion on the m->0 limit has been
added. typos corrected. some new refs added | Nucl.Phys.A791:117-164,2007 | 10.1016/j.nuclphysa.2007.03.134 | YITP-07-07, BARI-TH/07-563 | hep-ph nucl-th | null | We study the evolution of dynamic properties of the BCS/BEC (Bose-Einstein
Condensate) crossover in a relativistic superfluid as well as its
thermodynamics. We put particular focus on the change in the soft mode dynamics
throughout the crossover, and find that three different effective theories
describe it; these are, the time-dependent Ginzburg-Landau (TDGL) theory in the
BCS regime, the Gross-Pitaevskii (GP) theory in the BEC regime, and the
relativistic Gross-Pitaevskii (RGP) equation in the relativistic BEC (RBEC)
regime. Based on these effective theories, we discuss how the physical nature
of soft mode changes in the crossover. We also discuss some fluid-dynamic
aspects of the crossover using these effective theories with particular focus
on the shear viscosity. In addition to the study of soft modes, we show that
the ``quantum fluctuation'' is present in the relativistic fermion system,
which is in contrast to the usual Nozi`eres--Schmit-Rink (NSR) theory. We
clarify the physical meaning of the quantum fluctuation, and find that it
drastically increases the critical temperature in the weak coupling BCS regime.
| [
{
"created": "Mon, 8 May 2006 19:23:04 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Jan 2007 12:23:56 GMT",
"version": "v2"
},
{
"created": "Thu, 15 Mar 2007 03:10:36 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Abuki",
"H.",
"",
"Kyoto U., Yukawa Inst., Kyoto and INFN, Bari"
]
] | We study the evolution of dynamic properties of the BCS/BEC (Bose-Einstein Condensate) crossover in a relativistic superfluid as well as its thermodynamics. We put particular focus on the change in the soft mode dynamics throughout the crossover, and find that three different effective theories describe it; these are, the time-dependent Ginzburg-Landau (TDGL) theory in the BCS regime, the Gross-Pitaevskii (GP) theory in the BEC regime, and the relativistic Gross-Pitaevskii (RGP) equation in the relativistic BEC (RBEC) regime. Based on these effective theories, we discuss how the physical nature of soft mode changes in the crossover. We also discuss some fluid-dynamic aspects of the crossover using these effective theories with particular focus on the shear viscosity. In addition to the study of soft modes, we show that the ``quantum fluctuation'' is present in the relativistic fermion system, which is in contrast to the usual Nozi`eres--Schmit-Rink (NSR) theory. We clarify the physical meaning of the quantum fluctuation, and find that it drastically increases the critical temperature in the weak coupling BCS regime. |
0907.5158 | Gennaro Corcella | Gennaro Corcella (Enrico Fermi Ctr., Rome & SNS, Pisa & INFN, Pisa),
Federico Mescia (Barcelona U.) | A Phenomenological Study of Bottom Quark Fragmentation in Top Quark
Decay | 18 pages, 11 figures, 5 tables. Figures 4,5,10,11, Tables 2-5, Eqs.
(5)-(8) revised. Main results unchanged | Eur.Phys.J.C65:171-180,2010; Erratum-ibid.C68:687-690,2010 | 10.1140/epjc/s10052-009-1170-4 10.1140/epjc/s10052-010-1367-6 | UB-ECM-PF 09/20, ICCUB-09-222 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Top-quark physics is one of the main fields of investigation at the Tevatron
accelerator and, ultimately, at the LHC. We perform a phenomenological analysis
of ttbar events at hadron colliders, with a focus on observables relying on
bottom-quark fragmentation in top-quark decay. In particular, we investigate
the B-lepton invariant-mass distribution in the dilepton channel and give an
estimate of the contribution of bottom fragmentation to the Monte Carlo
uncertainty on the top-quark mass reconstruction.
| [
{
"created": "Wed, 29 Jul 2009 15:53:53 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Dec 2009 17:24:17 GMT",
"version": "v2"
},
{
"created": "Thu, 20 May 2010 09:44:18 GMT",
"version": "v3"
}
] | 2014-11-20 | [
[
"Corcella",
"Gennaro",
"",
"Enrico Fermi Ctr., Rome & SNS, Pisa & INFN, Pisa"
],
[
"Mescia",
"Federico",
"",
"Barcelona U."
]
] | Top-quark physics is one of the main fields of investigation at the Tevatron accelerator and, ultimately, at the LHC. We perform a phenomenological analysis of ttbar events at hadron colliders, with a focus on observables relying on bottom-quark fragmentation in top-quark decay. In particular, we investigate the B-lepton invariant-mass distribution in the dilepton channel and give an estimate of the contribution of bottom fragmentation to the Monte Carlo uncertainty on the top-quark mass reconstruction. |
hep-ph/0508181 | Georg Weiglein | Georg Weiglein | The LHC and the ILC | 10 pages, invited plenary talk at LCWS05, SLAC, March 2005 | null | null | IPPP/05/49, DCPT/05/98 | hep-ph | null | The synergy between the Large Hadron Collider and the International Linear
Collider during concurrent running of the two machines has the potential to
maximise the physics gain from both facilities. Some examples of detailed case
studies of the interplay between the LHC and ILC are given, with a particular
emphasis on new results that have been obtained after the first LHC / ILC Study
Group report was released.
| [
{
"created": "Tue, 16 Aug 2005 21:02:38 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Weiglein",
"Georg",
""
]
] | The synergy between the Large Hadron Collider and the International Linear Collider during concurrent running of the two machines has the potential to maximise the physics gain from both facilities. Some examples of detailed case studies of the interplay between the LHC and ILC are given, with a particular emphasis on new results that have been obtained after the first LHC / ILC Study Group report was released. |
1507.06164 | Krzysztof Turzynski | Leszek Roszkowski, Sebastian Trojanowski, Krzysztof Turzynski | Axino dark matter with low reheating temperature | v2: improved discussion of warm dark matter bounds, results for stau
LOSP added | null | 10.1007/JHEP11(2015)139 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine axino dark matter in the regime of a low reheating temperature T_R
after inflation and taking into account that reheating is a non-instantaneous
process. This can have a significant effect on the dark matter abundance,
mainly due to entropy production in inflaton decays. We study both thermal and
non-thermal production of axinos in the context of the MSSM with ten free
parameters. We identify the ranges of the axino mass and the reheating
temperature allowed by the LHC and other particle physics data in different
models of axino interactions. We confront these limits with cosmological
constraints coming the observed dark matter density, large structures formation
and big bang nucleosynthesis. We find a number of differences in the
phenomenologically acceptable values of the axino mass and the reheating
temperature relative to previous studies. In particular, an upper bound on the
axino mass becomes dependent on T_R, reaching a maximum value at T_R~10^2 GeV.
If the lightest ordinary supersymmetric particle is a wino or a higgsino, we
obtain lower a limit of approximately 10 GeV for the reheating temperature. We
demonstrate also that entropy production during reheating affects the maximum
allowed axino mass and lowest values of the reheating temperature.
| [
{
"created": "Wed, 22 Jul 2015 12:51:43 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Sep 2015 18:08:14 GMT",
"version": "v2"
}
] | 2016-01-20 | [
[
"Roszkowski",
"Leszek",
""
],
[
"Trojanowski",
"Sebastian",
""
],
[
"Turzynski",
"Krzysztof",
""
]
] | We examine axino dark matter in the regime of a low reheating temperature T_R after inflation and taking into account that reheating is a non-instantaneous process. This can have a significant effect on the dark matter abundance, mainly due to entropy production in inflaton decays. We study both thermal and non-thermal production of axinos in the context of the MSSM with ten free parameters. We identify the ranges of the axino mass and the reheating temperature allowed by the LHC and other particle physics data in different models of axino interactions. We confront these limits with cosmological constraints coming the observed dark matter density, large structures formation and big bang nucleosynthesis. We find a number of differences in the phenomenologically acceptable values of the axino mass and the reheating temperature relative to previous studies. In particular, an upper bound on the axino mass becomes dependent on T_R, reaching a maximum value at T_R~10^2 GeV. If the lightest ordinary supersymmetric particle is a wino or a higgsino, we obtain lower a limit of approximately 10 GeV for the reheating temperature. We demonstrate also that entropy production during reheating affects the maximum allowed axino mass and lowest values of the reheating temperature. |
1311.2569 | Veronique Bernard | Veronique Bernard | First determination of $f_+(0) |V_{us}|$ from a combined analysis of
$\tau\to K\pi \nu_\tau$ decay and $\pi K$ scattering with constraints from
$K_{\ell3}$ decays | 30 pages, 7 figures, Updated numerics and discussion slightly
extended. Published version | JHEP06(2014)082 | 10.1007/JHEP06(2014)082 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We perform a combined analysis of $\tau\to K\pi \nu_\tau$ decay and $\pi K$
scattering with constraints from $K_{\ell3}$ data using a $N/D$ approach that
fulfills requirements from unitarity and analyticity. We obtain a good fit of
the $I=1/2$ $\pi K$ amplitude in the $P$ wave using the LASS data above the
elastic region while in this region data are generated via Monte Carlo using
the FOCUS results based on $D_{\ell 4}$ decay. The spectrum and branching ratio
of $\tau\to K\pi \nu_\tau$ constrained by $K_{\ell3}$ decays are also well
reproduced leading to $f_+(0) |V_{us}|= 0.2163 \pm 0.0014 $. Furthermore, we
obtain the slope of the vector form factor $\lambda_+=(25.56 \pm 0.40) \times
10^{-3} $ while the value of the scalar form factor at the Callan-Treiman point
is $\ln C=0.2062 \pm 0.0089$. Given the experimental precision our results are
compatible with the Standard model.
| [
{
"created": "Mon, 11 Nov 2013 20:35:30 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Jun 2014 13:43:29 GMT",
"version": "v2"
}
] | 2015-06-17 | [
[
"Bernard",
"Veronique",
""
]
] | We perform a combined analysis of $\tau\to K\pi \nu_\tau$ decay and $\pi K$ scattering with constraints from $K_{\ell3}$ data using a $N/D$ approach that fulfills requirements from unitarity and analyticity. We obtain a good fit of the $I=1/2$ $\pi K$ amplitude in the $P$ wave using the LASS data above the elastic region while in this region data are generated via Monte Carlo using the FOCUS results based on $D_{\ell 4}$ decay. The spectrum and branching ratio of $\tau\to K\pi \nu_\tau$ constrained by $K_{\ell3}$ decays are also well reproduced leading to $f_+(0) |V_{us}|= 0.2163 \pm 0.0014 $. Furthermore, we obtain the slope of the vector form factor $\lambda_+=(25.56 \pm 0.40) \times 10^{-3} $ while the value of the scalar form factor at the Callan-Treiman point is $\ln C=0.2062 \pm 0.0089$. Given the experimental precision our results are compatible with the Standard model. |
2305.10660 | Dazhuang He | Dazhuang He, Yiling Xie, Hao Sun | The role of triangle singularity in the decay process $D^0 \to \pi^+
\pi^- f_0(980),\ f_0 \to \pi^+ \pi^-$ | null | Phys.Rev.D 107 (2023) 9, 094040 | 10.1103/PhysRevD.107.094040 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the process $D^0 \to \pi^+ \pi^- f_0(980),\ f_0 \to \pi^+ \pi^-$ by
introducing the triangle mechanism, in which $f_0(980)$ is considered to be
dynamically generated from the meson-meson interaction. For the total
contribution of this process, the contribution of the triangular loop formed by
$K^{*} \bar{K} K$ particles could generate a triangular singularity of about
1418 MeV. We calculate the differential decay width of this process and show a
narrow peak of about 980 MeV in the $\pi^+ \pi^-$ invariant mass distribution,
which comes from $f_0$ decay. For the $M_{inv}(\pi f_0)$ invariant mass
distribution, we obtain a finite peak at 1418 MeV, which is consistent with the
triangle singularity.
| [
{
"created": "Thu, 18 May 2023 02:43:51 GMT",
"version": "v1"
},
{
"created": "Sat, 20 May 2023 15:14:00 GMT",
"version": "v2"
},
{
"created": "Wed, 31 May 2023 06:56:57 GMT",
"version": "v3"
}
] | 2023-06-01 | [
[
"He",
"Dazhuang",
""
],
[
"Xie",
"Yiling",
""
],
[
"Sun",
"Hao",
""
]
] | We study the process $D^0 \to \pi^+ \pi^- f_0(980),\ f_0 \to \pi^+ \pi^-$ by introducing the triangle mechanism, in which $f_0(980)$ is considered to be dynamically generated from the meson-meson interaction. For the total contribution of this process, the contribution of the triangular loop formed by $K^{*} \bar{K} K$ particles could generate a triangular singularity of about 1418 MeV. We calculate the differential decay width of this process and show a narrow peak of about 980 MeV in the $\pi^+ \pi^-$ invariant mass distribution, which comes from $f_0$ decay. For the $M_{inv}(\pi f_0)$ invariant mass distribution, we obtain a finite peak at 1418 MeV, which is consistent with the triangle singularity. |
hep-ph/9603448 | Anton Kapustin | Martin Gremm, Anton Kapustin | Order 1/m_b^3 corrections to B\to X_c\ell\bar\nu decay and their
implication for the measurement of \bar\Lambda and \lambda_1 | 21 pages, revtex, 2 postscript figures. Section on the
nonrelativistic quark model estimates is removed; some points of the
computation are clarified; results unchanged | Phys.Rev.D55:6924-6932,1997 | 10.1103/PhysRevD.55.6924 | null | hep-ph | null | We compute the order 1/m_b^3 nonperturbative contributions to the inclusive
differential B\to X_c\ell\bar\nu decay rate. They are parametrized by the
expectation values of two local and four nonlocal dimension-six operators. We
use our results to estimate part of the theoretical uncertainties in the
extraction of matrix elements \bar\Lambda and \lambda_1 from the lepton
spectrum in the inclusive semileptonic B decay and find them to be very large.
We also compute the 1/m_b^3 corrections to the moments of the hadronic
invariant mass spectrum in this decay, and combine them with the extracted
values of \bar\Lambda and \lambda_1 to put an upper bound on the branching
fraction Br(B\to D^{**}\ell\bar\nu).
| [
{
"created": "Sun, 31 Mar 1996 21:35:03 GMT",
"version": "v1"
},
{
"created": "Sat, 10 Aug 1996 01:09:02 GMT",
"version": "v2"
},
{
"created": "Tue, 11 Mar 1997 06:14:09 GMT",
"version": "v3"
}
] | 2011-01-27 | [
[
"Gremm",
"Martin",
""
],
[
"Kapustin",
"Anton",
""
]
] | We compute the order 1/m_b^3 nonperturbative contributions to the inclusive differential B\to X_c\ell\bar\nu decay rate. They are parametrized by the expectation values of two local and four nonlocal dimension-six operators. We use our results to estimate part of the theoretical uncertainties in the extraction of matrix elements \bar\Lambda and \lambda_1 from the lepton spectrum in the inclusive semileptonic B decay and find them to be very large. We also compute the 1/m_b^3 corrections to the moments of the hadronic invariant mass spectrum in this decay, and combine them with the extracted values of \bar\Lambda and \lambda_1 to put an upper bound on the branching fraction Br(B\to D^{**}\ell\bar\nu). |
2203.11230 | Sachin Shain Poruvelil | W. Dekens, J. de Vries and S. Shain | CP-violating axion interactions in effective field theory | null | null | 10.1007/JHEP07(2022)014 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Axions are introduced to explain the observed smallness of the $\bar \theta $
term of QCD. Standard Model extensions typically contain new sources of CP
violation, for instance to account for the baryon asymmetry of the universe. In
the presence of additional CP-violating sources a Peccei-Quinn mechanism does
not remove all CP violation, leading to CP-odd interactions among axions and
Standard Model fields. In this work, we use effective field theory to
parametrize generic sources of beyond-the-Standard-Model CP violation. We
systematically compute the resulting CP-odd couplings of axions to leptons and
hadrons by using chiral perturbation theory. We discuss in detail the
phenomenology of the CP-odd axion couplings and compare limits from axion
searches, such as fifth force and monopole-dipole searches and astrophysics, to
direct limits on the CP-violating operators from electric dipole moment
experiments. While limits from electric dipole moment searches are tight, the
proposed ARIADNE experiment can potentially improve the existing constraints in
a window of axion masses.
| [
{
"created": "Mon, 21 Mar 2022 18:00:03 GMT",
"version": "v1"
},
{
"created": "Fri, 13 May 2022 16:29:16 GMT",
"version": "v2"
}
] | 2022-07-13 | [
[
"Dekens",
"W.",
""
],
[
"de Vries",
"J.",
""
],
[
"Shain",
"S.",
""
]
] | Axions are introduced to explain the observed smallness of the $\bar \theta $ term of QCD. Standard Model extensions typically contain new sources of CP violation, for instance to account for the baryon asymmetry of the universe. In the presence of additional CP-violating sources a Peccei-Quinn mechanism does not remove all CP violation, leading to CP-odd interactions among axions and Standard Model fields. In this work, we use effective field theory to parametrize generic sources of beyond-the-Standard-Model CP violation. We systematically compute the resulting CP-odd couplings of axions to leptons and hadrons by using chiral perturbation theory. We discuss in detail the phenomenology of the CP-odd axion couplings and compare limits from axion searches, such as fifth force and monopole-dipole searches and astrophysics, to direct limits on the CP-violating operators from electric dipole moment experiments. While limits from electric dipole moment searches are tight, the proposed ARIADNE experiment can potentially improve the existing constraints in a window of axion masses. |
1503.05727 | Shinya Matsuzaki | Takashi Yamaguchi and Shinya Matsuzaki | Light Quarkonium - Glueball Mixing from a Holographic QCD | 8 pages, 2 eps figures, latex; typos fixed and references added, to
appear in PRD | null | null | null | hep-ph hep-lat nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the mixing structure of isospin-singlet scalars, the light
quarkonium $(\bar{q}q)$ and glueball $(gg)$ in two-flavor QCD, based on a
holographic model of bottom-up hard-wall type. In the model the pure quarkonium
and glueball states are unambiguously defined in terms of the different
$U(1)_A$ charges in the restoration limit of the chiral $U(2)_L \times U(2)_R$
symmetry, in which the quarkonium gets massless as the chiral partner of the
pion. Hence the $\bar{q}q$-$gg$ mixing arises in the presence of the nonzero
chiral condensate or pion decay constant. At the realistic point where the pion
decay constant and other hadron masses reach the observed amount, we predict
the tiny mixing between the lightest quarkonia and glueball: The smallness of
the mixing is understood by the slightly small ratio of the chiral and gluon
condensate scales. The low-lying two scalar masses are calculated to be $\simeq
1.25$ GeV and $\simeq 1.77$ GeV, which are compared with masses of $f_0(1370)$
and $f_0(1710)$. Our result implies that $f_0(1710)$ predominantly consists of
glueball.
| [
{
"created": "Thu, 19 Mar 2015 12:03:49 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Mar 2015 10:33:58 GMT",
"version": "v2"
},
{
"created": "Thu, 14 May 2015 05:27:11 GMT",
"version": "v3"
}
] | 2015-05-15 | [
[
"Yamaguchi",
"Takashi",
""
],
[
"Matsuzaki",
"Shinya",
""
]
] | We study the mixing structure of isospin-singlet scalars, the light quarkonium $(\bar{q}q)$ and glueball $(gg)$ in two-flavor QCD, based on a holographic model of bottom-up hard-wall type. In the model the pure quarkonium and glueball states are unambiguously defined in terms of the different $U(1)_A$ charges in the restoration limit of the chiral $U(2)_L \times U(2)_R$ symmetry, in which the quarkonium gets massless as the chiral partner of the pion. Hence the $\bar{q}q$-$gg$ mixing arises in the presence of the nonzero chiral condensate or pion decay constant. At the realistic point where the pion decay constant and other hadron masses reach the observed amount, we predict the tiny mixing between the lightest quarkonia and glueball: The smallness of the mixing is understood by the slightly small ratio of the chiral and gluon condensate scales. The low-lying two scalar masses are calculated to be $\simeq 1.25$ GeV and $\simeq 1.77$ GeV, which are compared with masses of $f_0(1370)$ and $f_0(1710)$. Our result implies that $f_0(1710)$ predominantly consists of glueball. |
1810.03495 | Milena Piotrowska | Milena Piotrowska, Francesco Giacosa, Peter Kovacs | Can the $\psi(4040)$ explain the peak associated with $Y(4008)$? | 16 pages, 6 figures, 2 tables | null | 10.1140/epjc/s10052-019-6615-9 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the well-known resonance $\psi(4040)$, corresponding to a
$3^{3}S_{1}$ charm-anticharm vector state $\psi(3S)$, within a QFT approach, in
which the decay channels into $DD$, $D^{\ast}D$, $D^{\ast}D^{\ast}$,
$D_{s}D_{s}$ and $D_{s}^{\ast}D_{s}$ are considered. The spectral function
shows sizable deviations from a Breit-Wigner shape (an enhancement, mostly
generated by $DD^{\ast}$ loops, occurs); moreover, besides the $c\bar{c}$ pole
of $\psi(4040)$, a second dynamically generated broad pole at $4$ GeV emerges.
Naively, it is tempting to identify this new pole with the unconfirmed state
$Y(4008).$ Yet, this state was not seen in the reaction
$e^{+}e^{-}\rightarrow\psi(4040)\rightarrow DD^{\ast}$, but in processes with
$\pi^{+}\pi^{-}J/\psi$ in the final state. A detailed study shows a related but
different mechanism: a broad peak at $4$ GeV in the process
$e^{+}e^{-}\rightarrow\psi(4040)\rightarrow DD^{\ast
}\rightarrow\pi^{+}\pi^{-}J/\psi$ appears when $DD^{\ast}$ loops are
considered. Its existence in this reaction is not necessarily connected to the
existence of a dynamically generated pole, but the underlying mechanism - the
strong coupling of $c\bar{c}$ to \ $DD^{\ast}$ loops - can generate both of
them. Thus, the controversial state $Y(4008)$ may not be a genuine resonance,
but a peak generated by the $\psi(4040)$ and $D^{\ast}D$ loops with
$\pi^{+}\pi^{-}J/\psi$ in the final state.
| [
{
"created": "Mon, 8 Oct 2018 14:33:19 GMT",
"version": "v1"
}
] | 2019-02-20 | [
[
"Piotrowska",
"Milena",
""
],
[
"Giacosa",
"Francesco",
""
],
[
"Kovacs",
"Peter",
""
]
] | We study the well-known resonance $\psi(4040)$, corresponding to a $3^{3}S_{1}$ charm-anticharm vector state $\psi(3S)$, within a QFT approach, in which the decay channels into $DD$, $D^{\ast}D$, $D^{\ast}D^{\ast}$, $D_{s}D_{s}$ and $D_{s}^{\ast}D_{s}$ are considered. The spectral function shows sizable deviations from a Breit-Wigner shape (an enhancement, mostly generated by $DD^{\ast}$ loops, occurs); moreover, besides the $c\bar{c}$ pole of $\psi(4040)$, a second dynamically generated broad pole at $4$ GeV emerges. Naively, it is tempting to identify this new pole with the unconfirmed state $Y(4008).$ Yet, this state was not seen in the reaction $e^{+}e^{-}\rightarrow\psi(4040)\rightarrow DD^{\ast}$, but in processes with $\pi^{+}\pi^{-}J/\psi$ in the final state. A detailed study shows a related but different mechanism: a broad peak at $4$ GeV in the process $e^{+}e^{-}\rightarrow\psi(4040)\rightarrow DD^{\ast }\rightarrow\pi^{+}\pi^{-}J/\psi$ appears when $DD^{\ast}$ loops are considered. Its existence in this reaction is not necessarily connected to the existence of a dynamically generated pole, but the underlying mechanism - the strong coupling of $c\bar{c}$ to \ $DD^{\ast}$ loops - can generate both of them. Thus, the controversial state $Y(4008)$ may not be a genuine resonance, but a peak generated by the $\psi(4040)$ and $D^{\ast}D$ loops with $\pi^{+}\pi^{-}J/\psi$ in the final state. |
2211.14636 | Jose Illana | Jos\'e Ignacio Illana, Alejandro Jim\'enez Cano | Quantum field theory and the structure of the Standard Model | 71 pages, 32 figures. To appear in Proceedings of Corfu Summer
Institute 2021 "School and Workshops on Elementary Particle Physics and
Gravity" | null | null | null | hep-ph | http://creativecommons.org/licenses/by-nc-nd/4.0/ | The Standard Model of the electroweak and strong interactions of particle
physics is a quantum field theory. Elementary particles are not indivisible
`pieces' of matter but energy bundles of fields, whose properties and
interactions are a consequence of the principles of symmetry. These lecture
notes provide a brief introduction to the construction of the Standard Model
from its basic ingredients: Poincar\'e symmetry, gauge invariance and
spontaneous symmetry breaking. The full Lagrangian is derived in detail and the
most relevant aspects of the electroweak phenomenology are discussed with
special emphasis on the determination of the input parameters and the
consistency checks of the model. Some exercises are proposed to fix the main
ideas.
| [
{
"created": "Sat, 26 Nov 2022 18:40:37 GMT",
"version": "v1"
}
] | 2022-11-29 | [
[
"Illana",
"José Ignacio",
""
],
[
"Cano",
"Alejandro Jiménez",
""
]
] | The Standard Model of the electroweak and strong interactions of particle physics is a quantum field theory. Elementary particles are not indivisible `pieces' of matter but energy bundles of fields, whose properties and interactions are a consequence of the principles of symmetry. These lecture notes provide a brief introduction to the construction of the Standard Model from its basic ingredients: Poincar\'e symmetry, gauge invariance and spontaneous symmetry breaking. The full Lagrangian is derived in detail and the most relevant aspects of the electroweak phenomenology are discussed with special emphasis on the determination of the input parameters and the consistency checks of the model. Some exercises are proposed to fix the main ideas. |
1305.6833 | Alper Hayreter | Alper Hayreter and German Valencia | Constraining $\tau$-lepton dipole moments and gluon couplings at the LHC | 15 pages, 9 figures | null | 10.1103/PhysRevD.88.013015 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the constraints that can be placed on anomalous $\tau$-lepton
couplings at the LHC. We use an effective Lagrangian description for physics
beyond the standard model which contains the $\tau$-lepton anomalous magnetic
moment, electric dipole moment and weak dipole moments in two operators of
dimension six. We include in our study two additional operators of dimension
eight that directly couple the $\tau$-leptons to gluons and are therefore
enhanced at the LHC. We consider the two main effects from these couplings:
modifications to the Drell-Yan cross-section and to the $\tau$-lepton pair
production in association with a Higgs boson. We find that a measurement of the
former at the 14% level can produce constraints comparable to existing ones for
the anomalous dipole couplings; and that a bound on the latter at a sensitivity
level of $500\ \sigma_{SM}$ or better would produce the best constraint on the
$\tau$-gluonic couplings.
| [
{
"created": "Wed, 29 May 2013 15:33:02 GMT",
"version": "v1"
},
{
"created": "Fri, 8 May 2015 21:29:51 GMT",
"version": "v2"
}
] | 2015-05-12 | [
[
"Hayreter",
"Alper",
""
],
[
"Valencia",
"German",
""
]
] | We study the constraints that can be placed on anomalous $\tau$-lepton couplings at the LHC. We use an effective Lagrangian description for physics beyond the standard model which contains the $\tau$-lepton anomalous magnetic moment, electric dipole moment and weak dipole moments in two operators of dimension six. We include in our study two additional operators of dimension eight that directly couple the $\tau$-leptons to gluons and are therefore enhanced at the LHC. We consider the two main effects from these couplings: modifications to the Drell-Yan cross-section and to the $\tau$-lepton pair production in association with a Higgs boson. We find that a measurement of the former at the 14% level can produce constraints comparable to existing ones for the anomalous dipole couplings; and that a bound on the latter at a sensitivity level of $500\ \sigma_{SM}$ or better would produce the best constraint on the $\tau$-gluonic couplings. |
hep-ph/0310253 | V. Gogohia | V. Gogohia, Gy. Kluge, I. Vargas de Usera | A general solution for the quark propagator in two-dimensional covariant
gauge QCD | 12 pages, two figures, no tables, typos are corrected | Phys.Lett. B576 (2003) 243-252 | 10.1016/j.physletb.2003.09.093 | null | hep-ph | null | We have investigated a closed set of equations for the quark propagator,
which has been obtained earlier within a new, nonperturbative approach to
two-dimencional covariant gauge QCD. It is shown that this theory implies quark
confinement (the quark propagator has no poles, indeed), as well as dynamical
breakdown of chiral symmetry (a chiral symmetry preserving solution is
forbidden). The above-mentioned set of equations can be exactly solved in the
chiral limit. We develop an analytical formalism, the so-called chiral
perturbation theory at the fundamental quark level, which allows one to find
solution for the quark propagator in powers of the light quark masses. Each
correction satisfies the differential equation, which can be formally solved.
We develop also an analytical formalism which alows one to find solution for
the quark propagator in the inverse powers of the heavy quark masses. IT
coincides with free heavy quark propagator up to terms of order $1/m_Q^3$,
where $m_Q$ is the heavy quark mass. So this solution automatically possesses
the heavy quark flavor symmetry up to terms of order $1/m_Q$. At the same time,
we have found a general solution for the heavy quark propagator, which by no
means can be reduced to the free one.
| [
{
"created": "Tue, 21 Oct 2003 13:50:39 GMT",
"version": "v1"
},
{
"created": "Fri, 31 Oct 2003 13:31:51 GMT",
"version": "v2"
}
] | 2015-06-25 | [
[
"Gogohia",
"V.",
""
],
[
"Kluge",
"Gy.",
""
],
[
"de Usera",
"I. Vargas",
""
]
] | We have investigated a closed set of equations for the quark propagator, which has been obtained earlier within a new, nonperturbative approach to two-dimencional covariant gauge QCD. It is shown that this theory implies quark confinement (the quark propagator has no poles, indeed), as well as dynamical breakdown of chiral symmetry (a chiral symmetry preserving solution is forbidden). The above-mentioned set of equations can be exactly solved in the chiral limit. We develop an analytical formalism, the so-called chiral perturbation theory at the fundamental quark level, which allows one to find solution for the quark propagator in powers of the light quark masses. Each correction satisfies the differential equation, which can be formally solved. We develop also an analytical formalism which alows one to find solution for the quark propagator in the inverse powers of the heavy quark masses. IT coincides with free heavy quark propagator up to terms of order $1/m_Q^3$, where $m_Q$ is the heavy quark mass. So this solution automatically possesses the heavy quark flavor symmetry up to terms of order $1/m_Q$. At the same time, we have found a general solution for the heavy quark propagator, which by no means can be reduced to the free one. |
1109.4478 | Errol Gotsman | Errol Gotsman | A Model for Soft Interactions motivated by AdS/CFT and QCD | Invited talk at the DPF-2011 Conference, Providence, RI, August 8-13,
2011. 6 pages, LaTex, 6 eps figures | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Monte Carlo generators which were tuned for energies up to that of the
Tevatron, are found wanting when extended to LHC energies. We construct a model
that satisfies the theoretical requisites of high energy soft interactions,
based on two conjectures: (i) the results of the Ads/CDF correspondence for N =
4 SYM, and (ii) the requirement of matching with high energy QCD. In keeping
with these postulates, we assume that the soft Pomeron intercept is relatively
large, and the slope of the Pomeron trajectory is equal to zero. We derive
analytical formulae that sum both the enhanced and semi-enhanced diagrams for
elastic and diffractive amplitudes. Parameters of the model are obtained by
fitting to experimental data, up to and including the Tevatron energies, and we
predict cross sections at all energies accessible at the LHC and beyond.
Predictions of the model are in agreement with measured values obtained by
CMS, ATLAS and ALICE for inelastic and inclusive cross sections. We compare our
results with experimental data and competing models.
| [
{
"created": "Wed, 21 Sep 2011 06:39:02 GMT",
"version": "v1"
}
] | 2011-09-22 | [
[
"Gotsman",
"Errol",
""
]
] | Monte Carlo generators which were tuned for energies up to that of the Tevatron, are found wanting when extended to LHC energies. We construct a model that satisfies the theoretical requisites of high energy soft interactions, based on two conjectures: (i) the results of the Ads/CDF correspondence for N = 4 SYM, and (ii) the requirement of matching with high energy QCD. In keeping with these postulates, we assume that the soft Pomeron intercept is relatively large, and the slope of the Pomeron trajectory is equal to zero. We derive analytical formulae that sum both the enhanced and semi-enhanced diagrams for elastic and diffractive amplitudes. Parameters of the model are obtained by fitting to experimental data, up to and including the Tevatron energies, and we predict cross sections at all energies accessible at the LHC and beyond. Predictions of the model are in agreement with measured values obtained by CMS, ATLAS and ALICE for inelastic and inclusive cross sections. We compare our results with experimental data and competing models. |
1208.6077 | John R. Hiller | J.R. Hiller | A nonperturbative light-front coupled-cluster method | 6 pages, 7 figures; RevTeX 4.1; presented at QCD@Work2012, the
International Workshop on QCD Theory and Experiment, June 18-21, 2012, Lecce,
Italy | null | 10.1063/1.4763515 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The nonperturbative Hamiltonian eigenvalue problem for bound states of a
quantum field theory is formulated in terms of Dirac's light-front coordinates
and then approximated by the exponential-operator technique of the many-body
coupled-cluster method. This approximation eliminates any need for the usual
approximation of Fock-space truncation. Instead, the exponentiated operator is
truncated, and the terms retained are determined by a set of nonlinear integral
equations. These equations are solved simultaneously with an effective
eigenvalue problem in the valence sector, where the number of constituents is
small. Matrix elements can be calculated, with extensions of techniques from
standard coupled-cluster theory, to obtain form factors and other observables.
| [
{
"created": "Thu, 30 Aug 2012 04:36:25 GMT",
"version": "v1"
}
] | 2015-06-11 | [
[
"Hiller",
"J. R.",
""
]
] | The nonperturbative Hamiltonian eigenvalue problem for bound states of a quantum field theory is formulated in terms of Dirac's light-front coordinates and then approximated by the exponential-operator technique of the many-body coupled-cluster method. This approximation eliminates any need for the usual approximation of Fock-space truncation. Instead, the exponentiated operator is truncated, and the terms retained are determined by a set of nonlinear integral equations. These equations are solved simultaneously with an effective eigenvalue problem in the valence sector, where the number of constituents is small. Matrix elements can be calculated, with extensions of techniques from standard coupled-cluster theory, to obtain form factors and other observables. |
1804.01534 | Andrew Kobach | Andrew Kobach, Sridip Pal | Conformal Structure of the Heavy Particle EFT Operator Basis | 8+9 pages, minor typographical changes made | null | 10.1016/j.physletb.2018.06.060 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An operator basis of an effective theory with a heavy particle, subject to
external gauge fields, is spanned by a particular kind of neutral scalar
primary of the nonrelativistic conformal group. We calculate the characters
that can be used for generating the operators in a non-relativistic effective
field theory, which accounts for redundancies from the equations of motion and
integration by parts.
| [
{
"created": "Wed, 4 Apr 2018 18:00:01 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Jul 2018 15:18:54 GMT",
"version": "v2"
}
] | 2018-08-15 | [
[
"Kobach",
"Andrew",
""
],
[
"Pal",
"Sridip",
""
]
] | An operator basis of an effective theory with a heavy particle, subject to external gauge fields, is spanned by a particular kind of neutral scalar primary of the nonrelativistic conformal group. We calculate the characters that can be used for generating the operators in a non-relativistic effective field theory, which accounts for redundancies from the equations of motion and integration by parts. |
2102.01714 | Huaike Guo | Alba Romero, Katarina Martinovic, Thomas A. Callister, Huai-Ke Guo,
Mario Mart\'inez, Mairi Sakellariadou, Feng-Wei Yang, Yue Zhao | Implications for First-Order Cosmological Phase Transitions from the
Third LIGO-Virgo Observing Run | 7 pages, 3 figures, version published in Physical Review Letters | Phys. Rev. Lett. 126, 151301 (2021) | 10.1103/PhysRevLett.126.151301 | null | hep-ph gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We place constraints on the normalized energy density in gravitational waves
from first-order strong phase transitions using data from Advanced LIGO and
Virgo's first, second and third observing runs. First, adopting a broken power
law model, we place $95 \%$ confidence level upper limits simultaneously on the
gravitational-wave energy density at 25 Hz from unresolved compact binary
mergers, $\Omega_{\rm CBC} < 6.1 \times 10^{-9}$, and strong first-order phase
transitions, $\Omega_{\rm BPL} < 4.4 \times 10^{-9}$. The inclusion of the
former is necessary since we expect this astrophysical signal to be the
foreground of any detected spectrum. We then consider two more complex
phenomenological models, limiting at 25 Hz the gravitational-wave background
due to bubble collisions to $\Omega_{\rm pt} < 5.0\times 10^{-9}$ and the
background due to sound waves to $\Omega_{\rm pt} < 5.8\times10^{-9}$ at $95
\%$ confidence level for phase transitions occurring at temperatures above
$10^8$GeV.
| [
{
"created": "Tue, 2 Feb 2021 19:11:18 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Apr 2021 20:38:33 GMT",
"version": "v2"
}
] | 2021-04-21 | [
[
"Romero",
"Alba",
""
],
[
"Martinovic",
"Katarina",
""
],
[
"Callister",
"Thomas A.",
""
],
[
"Guo",
"Huai-Ke",
""
],
[
"Martínez",
"Mario",
""
],
[
"Sakellariadou",
"Mairi",
""
],
[
"Yang",
"Feng-Wei",
""
],
[
"Zhao",
"Yue",
""
]
] | We place constraints on the normalized energy density in gravitational waves from first-order strong phase transitions using data from Advanced LIGO and Virgo's first, second and third observing runs. First, adopting a broken power law model, we place $95 \%$ confidence level upper limits simultaneously on the gravitational-wave energy density at 25 Hz from unresolved compact binary mergers, $\Omega_{\rm CBC} < 6.1 \times 10^{-9}$, and strong first-order phase transitions, $\Omega_{\rm BPL} < 4.4 \times 10^{-9}$. The inclusion of the former is necessary since we expect this astrophysical signal to be the foreground of any detected spectrum. We then consider two more complex phenomenological models, limiting at 25 Hz the gravitational-wave background due to bubble collisions to $\Omega_{\rm pt} < 5.0\times 10^{-9}$ and the background due to sound waves to $\Omega_{\rm pt} < 5.8\times10^{-9}$ at $95 \%$ confidence level for phase transitions occurring at temperatures above $10^8$GeV. |
hep-ph/0209146 | Savely G. Karshenboim | S. I. Eidelman, S. G. Karshenboim, V. A. Shelyuto | Hadronic effects in leptonic systems: muonium hyperfine structure and
anomalous magnetic moment of muon | Presented at PSAS 2002 (St. Petersburg) | Can.J.Phys.80:1297-1303,2002 | 10.1139/p02-103 | null | hep-ph | null | Contributions of hadronic effects to the muonium physics and anomalous
magnetic moment of muon are considered. Special attention is paid to
higher-order effects and the uncertainty related to the hadronic contribution
to the hyperfine structure interval in the ground state of muonium.
| [
{
"created": "Fri, 13 Sep 2002 08:22:53 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Eidelman",
"S. I.",
""
],
[
"Karshenboim",
"S. G.",
""
],
[
"Shelyuto",
"V. A.",
""
]
] | Contributions of hadronic effects to the muonium physics and anomalous magnetic moment of muon are considered. Special attention is paid to higher-order effects and the uncertainty related to the hadronic contribution to the hyperfine structure interval in the ground state of muonium. |
hep-ph/9905457 | Ray Subharthi | Jishnu Dey, Siddhartha Bhowmik, Kanad Ray and Subharthi Ray | Limiting temperature of hadrons using states predicted from
kappa-deformed Poincar\'e algebra | 7 Latex pages including two figures | Indian J.Phys. 73B (1999) 409-415 | null | null | hep-ph | null | The experimental hadronic density of states dN/dm, assumed to be a sum of
normalized Breit- Wigner distributions and plotted as a function of the hadron
mass m, fails to show a Hagedorn like growth beyond 2 GeV, probably due to a
lack of data. Experimental hadronic states are fitted using $\ka$ -deformed
Poincar\'e algebra and the fit is used to extrapolate for including states not
detected. For the theoretical density of states the plot is a straight line in
the log scale even beyond 2 GeV with a limiting temperature of 400 MeV.
| [
{
"created": "Sun, 23 May 1999 14:49:35 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Dey",
"Jishnu",
""
],
[
"Bhowmik",
"Siddhartha",
""
],
[
"Ray",
"Kanad",
""
],
[
"Ray",
"Subharthi",
""
]
] | The experimental hadronic density of states dN/dm, assumed to be a sum of normalized Breit- Wigner distributions and plotted as a function of the hadron mass m, fails to show a Hagedorn like growth beyond 2 GeV, probably due to a lack of data. Experimental hadronic states are fitted using $\ka$ -deformed Poincar\'e algebra and the fit is used to extrapolate for including states not detected. For the theoretical density of states the plot is a straight line in the log scale even beyond 2 GeV with a limiting temperature of 400 MeV. |
hep-ph/9603282 | null | K.C. Chou (CAS) and Yue-Liang Wu (OSU) | A Predictive SUSY SO(10) X Delta (48) X U(1) Model for CP Violation,
Neutrino Oscillation, Fermion Masses and Mixings with Very Low tan(beta) | 46 pages, ReVTeX | null | null | CAS-HEP-T-96-03/004, OHSTPY-HEP-T-96-008 | hep-ph | null | Assuming universality of Yukawa coupling of the superpotential and maximal
spontaneous CP violation, fermion masses and mixing angles including that of
neutrinos are studied in an SUSY SO(10)$\times \Delta (48)\times$ U(1) model
with small $\tan \beta$. The low energy parameters of the standard model are
determined solely by the Clebsch factors of the symmetry group and the
structure of the physical vacuum. Thirteen parameters involving masses and
mixing angles in the quark and charged lepton sector are successfully predicted
by only four parameters with three of them determined by the scales of
U(1)$\times \Delta(48)$, SO(10), SU(5) and SU(2)$_{L}$ symmetry breakings. An
interesting prediction on ten parameters concerning the neutrino sector is also
made by using the same four parameters. An additional parameter is added to
obtain the mass and mixing of a sterile neutrino. It is found that the LSND
$\bar{\nu}_{\mu} \rightarrow \bar{\nu}_{e}$ events, atmospheric neutrino
deficit and the mass limit put by hot dark matter can be naturally explained.
Solar neutrino puzzle can be solved only by introducing a sterile neutrino.
$(\nu_{e} - \nu_{\tau})$ oscillation is found to have the same sensitive region
as the $(\nu_{e} - \nu_{\mu})$ oscillation. The hadronic parameters $B_{K}$ and
$f_{B}\sqrt{B}$ are extracted from the observed $K^{0}$-$\bar{K}^{0}$ and
$B^{0}$-$\bar{B}^{0}$ mixings respectively. The direct CP violation
($\varepsilon'/\varepsilon$) in kaon decays and the three angles $\alpha$,
$\beta$ and $\gamma$ of the unitarity triangle in the CKM matrix are also
presented. More precise measurements of $\alpha_{s}(M_{Z})$, $|V_{cb}|$,
$|V_{ub}/V_{cb}|$, $m_{t}$, as well as various CP violation and neutrino
oscillation experiments will provide crucial tests for the present model.
| [
{
"created": "Tue, 12 Mar 1996 16:26:02 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Chou",
"K. C.",
"",
"CAS"
],
[
"Wu",
"Yue-Liang",
"",
"OSU"
]
] | Assuming universality of Yukawa coupling of the superpotential and maximal spontaneous CP violation, fermion masses and mixing angles including that of neutrinos are studied in an SUSY SO(10)$\times \Delta (48)\times$ U(1) model with small $\tan \beta$. The low energy parameters of the standard model are determined solely by the Clebsch factors of the symmetry group and the structure of the physical vacuum. Thirteen parameters involving masses and mixing angles in the quark and charged lepton sector are successfully predicted by only four parameters with three of them determined by the scales of U(1)$\times \Delta(48)$, SO(10), SU(5) and SU(2)$_{L}$ symmetry breakings. An interesting prediction on ten parameters concerning the neutrino sector is also made by using the same four parameters. An additional parameter is added to obtain the mass and mixing of a sterile neutrino. It is found that the LSND $\bar{\nu}_{\mu} \rightarrow \bar{\nu}_{e}$ events, atmospheric neutrino deficit and the mass limit put by hot dark matter can be naturally explained. Solar neutrino puzzle can be solved only by introducing a sterile neutrino. $(\nu_{e} - \nu_{\tau})$ oscillation is found to have the same sensitive region as the $(\nu_{e} - \nu_{\mu})$ oscillation. The hadronic parameters $B_{K}$ and $f_{B}\sqrt{B}$ are extracted from the observed $K^{0}$-$\bar{K}^{0}$ and $B^{0}$-$\bar{B}^{0}$ mixings respectively. The direct CP violation ($\varepsilon'/\varepsilon$) in kaon decays and the three angles $\alpha$, $\beta$ and $\gamma$ of the unitarity triangle in the CKM matrix are also presented. More precise measurements of $\alpha_{s}(M_{Z})$, $|V_{cb}|$, $|V_{ub}/V_{cb}|$, $m_{t}$, as well as various CP violation and neutrino oscillation experiments will provide crucial tests for the present model. |
1511.05347 | Daniele Teresi | Apostolos Pilaftsis and Daniele Teresi | Symmetry-Improved 2PI Approach to the Goldstone-Boson IR Problem of the
SM Effective Potential | 33 pages, 14 figures, journal version | Nucl.Phys. B906 (2016) 381-407 | 10.1016/j.nuclphysb.2016.03.018 | MAN/HEP/2015/18, ULB-TH/15-19 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The effective potential of the Standard Model (SM), from three loop order and
higher, suffers from infra-red (IR) divergences arising from quantum effects
due to massless would-be Goldstone bosons associated with the longitudinal
polarizations of the W and Z bosons. Such IR pathologies also hinder accurate
evaluation of the two-loop threshold corrections to electroweak quantities,
such as the vacuum expectation value of the Higgs field. However, these
divergences are an artifact of perturbation theory, and therefore need to be
consistently resummed in order to obtain a IR-safe effective potential. The
so-called Two-Particle-Irreducible (2PI) effective action provides a rigorous
framework to consistently perform such resummations, without the need to resort
to ad hoc subtractions or running into the risk of over-counting contributions.
By considering the recently proposed symmetry-improved 2PI formalism, we
address the problem of the Goldstone-boson IR divergences of the SM effective
potential in the gaugeless limit of the theory. In the same limit, we evaluate
the IR-safe symmetry-improved 2PI effective potential, after taking into
account quantum loops of chiral fermions, as well as the renormalization of
spurious custodially breaking effects triggered by fermionic Yukawa
interactions. Finally, we compare our results with those obtained with other
methods presented in the literature.
| [
{
"created": "Tue, 17 Nov 2015 11:02:18 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Jun 2016 09:38:23 GMT",
"version": "v2"
}
] | 2016-06-29 | [
[
"Pilaftsis",
"Apostolos",
""
],
[
"Teresi",
"Daniele",
""
]
] | The effective potential of the Standard Model (SM), from three loop order and higher, suffers from infra-red (IR) divergences arising from quantum effects due to massless would-be Goldstone bosons associated with the longitudinal polarizations of the W and Z bosons. Such IR pathologies also hinder accurate evaluation of the two-loop threshold corrections to electroweak quantities, such as the vacuum expectation value of the Higgs field. However, these divergences are an artifact of perturbation theory, and therefore need to be consistently resummed in order to obtain a IR-safe effective potential. The so-called Two-Particle-Irreducible (2PI) effective action provides a rigorous framework to consistently perform such resummations, without the need to resort to ad hoc subtractions or running into the risk of over-counting contributions. By considering the recently proposed symmetry-improved 2PI formalism, we address the problem of the Goldstone-boson IR divergences of the SM effective potential in the gaugeless limit of the theory. In the same limit, we evaluate the IR-safe symmetry-improved 2PI effective potential, after taking into account quantum loops of chiral fermions, as well as the renormalization of spurious custodially breaking effects triggered by fermionic Yukawa interactions. Finally, we compare our results with those obtained with other methods presented in the literature. |
hep-ph/0111082 | Jose L. Goity | C. L. Schat, J. L. Goity and N. N. Scoccola | Masses of the 70- Baryons in Large Nc QCD | 11 pages; references were added and a couple of improvements to the
text were made | Phys.Rev.Lett.88:102002,2002 | 10.1103/PhysRevLett.88.102002 | JLAB-THY-01-35 | hep-ph | null | The masses of the negative parity 70-plet baryons are analyzed in large N_c
QCD to order 1/N_c and to first order in SU(3) symmetry breaking. The existing
experimental data are well reproduced and twenty new observables are predicted.
The leading order SU(6) spin-flavor symmetry breaking is small and, as it
occurs in the quark model, the subleading in 1/N_c hyperfine interaction is the
dominant source of the breaking. It is found that the Lambda(1405) and
Lambda(1520) are well described as three-quark states and spin-orbit partners.
New relations between splittings in different SU(3) multiplets are found.
| [
{
"created": "Wed, 7 Nov 2001 20:35:27 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Mar 2002 20:13:19 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Schat",
"C. L.",
""
],
[
"Goity",
"J. L.",
""
],
[
"Scoccola",
"N. N.",
""
]
] | The masses of the negative parity 70-plet baryons are analyzed in large N_c QCD to order 1/N_c and to first order in SU(3) symmetry breaking. The existing experimental data are well reproduced and twenty new observables are predicted. The leading order SU(6) spin-flavor symmetry breaking is small and, as it occurs in the quark model, the subleading in 1/N_c hyperfine interaction is the dominant source of the breaking. It is found that the Lambda(1405) and Lambda(1520) are well described as three-quark states and spin-orbit partners. New relations between splittings in different SU(3) multiplets are found. |
1912.09924 | Christian Kohlf\"urst | Ivan A. Aleksandrov and Christian Kohlf\"urst | Pair production in temporally and spatially oscillating fields | 43 pages (single-column), 14 figures; matches journal version | Phys. Rev. D 101, 096009 (2020) | 10.1103/PhysRevD.101.096009 | null | hep-ph physics.comp-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Electron-positron pair production for inhomogeneous electric and magnetic
fields oscillating in space and time is investigated. By employing accurate
numerical methods (Furry-picture quantization and quantum kinetic theory),
final particle momentum spectra are calculated and analyzed in terms of
effective models. Furthermore, criteria for the applicability of approximate
methods are derived and discussed. In this context, special focus is placed on
the local density approximation, where fields are assumed to be locally
homogeneous in space. Eventually, we apply our findings to the multiphoton
regime. Special emphasis is on the importance of linear momentum conservation
and the effect of its absence in momentum spectra within approximations based
on local homogeneity of the fields.
| [
{
"created": "Fri, 20 Dec 2019 16:35:54 GMT",
"version": "v1"
},
{
"created": "Sun, 21 Jun 2020 17:51:14 GMT",
"version": "v2"
}
] | 2020-06-23 | [
[
"Aleksandrov",
"Ivan A.",
""
],
[
"Kohlfürst",
"Christian",
""
]
] | Electron-positron pair production for inhomogeneous electric and magnetic fields oscillating in space and time is investigated. By employing accurate numerical methods (Furry-picture quantization and quantum kinetic theory), final particle momentum spectra are calculated and analyzed in terms of effective models. Furthermore, criteria for the applicability of approximate methods are derived and discussed. In this context, special focus is placed on the local density approximation, where fields are assumed to be locally homogeneous in space. Eventually, we apply our findings to the multiphoton regime. Special emphasis is on the importance of linear momentum conservation and the effect of its absence in momentum spectra within approximations based on local homogeneity of the fields. |
2012.04339 | Jens O. Andersen | Prabal Adhikari, Jens O. Andersen, and Martin A. Mojahed | Quark, pion and axial condensates in three-flavor finite isospin chiral
perturbation theory | 12 pages 4 figures. v2: matches published version | null | 10.1140/epjc/s10052-021-09212-7 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the light quark condensate, the strange quark condensate, the
pion condensate, and the axial condensate in three-flavor chiral perturbation
theory ($\chi$PT) in the presence of an isospin chemical potential at
next-to-leading order at zero temperature. It is shown that the three-flavor
$\chi$PT effective potential and condensates can be mapped onto two-flavor
$\chi$PT ones by integrating out mesons with strange quark content (kaons and
eta), with renormalized couplings. We compare the results for the light quark
and pion condensates at finite pseudoscalar source with ($2+1$)-flavor lattice
QCD, and we also compare the axial condensate at zero pseudoscalar and axial
sources with lattice QCD data. We find that the light quark, pion, and axial
condensates are in very good agreement with lattice data. There is an overall
improvement by including NLO effects.
| [
{
"created": "Tue, 8 Dec 2020 10:25:54 GMT",
"version": "v1"
},
{
"created": "Sat, 5 Jun 2021 08:33:59 GMT",
"version": "v2"
}
] | 2023-01-11 | [
[
"Adhikari",
"Prabal",
""
],
[
"Andersen",
"Jens O.",
""
],
[
"Mojahed",
"Martin A.",
""
]
] | We calculate the light quark condensate, the strange quark condensate, the pion condensate, and the axial condensate in three-flavor chiral perturbation theory ($\chi$PT) in the presence of an isospin chemical potential at next-to-leading order at zero temperature. It is shown that the three-flavor $\chi$PT effective potential and condensates can be mapped onto two-flavor $\chi$PT ones by integrating out mesons with strange quark content (kaons and eta), with renormalized couplings. We compare the results for the light quark and pion condensates at finite pseudoscalar source with ($2+1$)-flavor lattice QCD, and we also compare the axial condensate at zero pseudoscalar and axial sources with lattice QCD data. We find that the light quark, pion, and axial condensates are in very good agreement with lattice data. There is an overall improvement by including NLO effects. |
2402.12454 | Xavier Ponce Diaz | Luca Di Luzio, Alfredo Walter Mario Guerrera, Xavier Ponce D\'iaz,
Stefano Rigolin | Axion-Like Particles in Radiative Quarkonia Decays | 25 pages, 8 figures, 1 appendix | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Radiative quarkonia decays offer an ideal setting for probing Axion-Like
Particle (ALP) interactions. This paper provides a comprehensive review of ALP
production mechanisms through the $e^+ e^- \to \gamma\,a$ process at B- and
Charm-factories, alongside an analysis of potential ALP decay channels. We
derive constraints on ALP couplings to Standard Model (SM) fields, based on
recent experimental results on quarkonia decays by the Belle II and BESIII
collaborations. The analysis distinguishes between "invisible" and "visible"
ALP decay scenarios. The "invisible" scenario, characterised by a mono-$\gamma$
plus missing-energy signature, enables stringent limits on ALP-photon and
ALP-quark ($b$ or $c$) couplings. Moreover, extensive research at flavour
factories has explored various "visible" ALP decays into SM final states, which
depend on a larger set of ALP-SM couplings. To streamline the "visible" ALP
scenario, we introduce additional theoretical assumptions, such as universal
ALP-fermion couplings, or we adopt specific benchmark ALP models, aiming to
minimise the number of independent variables in our analysis.
| [
{
"created": "Mon, 19 Feb 2024 19:02:22 GMT",
"version": "v1"
}
] | 2024-02-21 | [
[
"Di Luzio",
"Luca",
""
],
[
"Guerrera",
"Alfredo Walter Mario",
""
],
[
"Díaz",
"Xavier Ponce",
""
],
[
"Rigolin",
"Stefano",
""
]
] | Radiative quarkonia decays offer an ideal setting for probing Axion-Like Particle (ALP) interactions. This paper provides a comprehensive review of ALP production mechanisms through the $e^+ e^- \to \gamma\,a$ process at B- and Charm-factories, alongside an analysis of potential ALP decay channels. We derive constraints on ALP couplings to Standard Model (SM) fields, based on recent experimental results on quarkonia decays by the Belle II and BESIII collaborations. The analysis distinguishes between "invisible" and "visible" ALP decay scenarios. The "invisible" scenario, characterised by a mono-$\gamma$ plus missing-energy signature, enables stringent limits on ALP-photon and ALP-quark ($b$ or $c$) couplings. Moreover, extensive research at flavour factories has explored various "visible" ALP decays into SM final states, which depend on a larger set of ALP-SM couplings. To streamline the "visible" ALP scenario, we introduce additional theoretical assumptions, such as universal ALP-fermion couplings, or we adopt specific benchmark ALP models, aiming to minimise the number of independent variables in our analysis. |
0805.2247 | Carlos Merino | N. Armesto, C. Merino, G. Parente, and E. Zas | Small-x Physics and the Detection of UHE Neutrinos | Contribution to the Proceedings of the XLIII Rencontres de Moriond:
QCD and High Energy Interactions, La Thulile, Italy, 8-15 March 2008. Talk
presented by G. Parente (4 pages and 3 figures) | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We evaluate both the tau lepton energy loss produced by photonuclear
interactions and the neutrino charged current cross section at ultra-high
energies, both relevant to neutrino bounds with Earth-skimming tau neutrinos.
| [
{
"created": "Thu, 15 May 2008 10:12:01 GMT",
"version": "v1"
}
] | 2008-05-16 | [
[
"Armesto",
"N.",
""
],
[
"Merino",
"C.",
""
],
[
"Parente",
"G.",
""
],
[
"Zas",
"E.",
""
]
] | We evaluate both the tau lepton energy loss produced by photonuclear interactions and the neutrino charged current cross section at ultra-high energies, both relevant to neutrino bounds with Earth-skimming tau neutrinos. |
hep-ph/9411203 | Jens Erler | Jens Erler and Paul Langacker | Implications of High Precision Experiments and the CDF Top Quark
Candidates | 23 pages REVTeX + 3 figures (not included); complete postscript file
available via anonymous ftp
ftp://dept.physics.upenn.edu/pub/Langacker/statussmprep.ps | Phys.Rev.D52:441-450,1995 | 10.1103/PhysRevD.52.441 | UPR-0632T | hep-ph | null | We discuss the consequences of recent experimental results from CDF, SLC, LEP
and elsewhere for the Standard Model and for new physics. A global fit to all
indirect precision data yields $m_t = 175 \pm 11^{+17}_{-19}$~GeV,
$\sin^2\theta_{MS} = 0.2317(3)(2)$, and $\alpha_s = 0.127(5)(2)$, where the
central values are for $M_H = 300$ GeV and the second uncertainties are for
$M_H \rightarrow 1000$ GeV (+) and 60 GeV (-). The $m_t$ value is in remarkable
agreement with the value $m_t=174 \pm 16$ GeV suggested by the CDF candidate
events. There is a slight preference for a light Higgs with $M_H < 730$ (880)
GeV at 95\% c.l. if the CDF $m_t$ value is (not) included. The sensitivity is,
however, due almost entirely to the anomalously large observed values for the
$Z \rightarrow b\bar{b}$ width and left-right asymmetry. The value of alpha_s
(from the lineshape) is clean theoretically assuming the Standard Model, but is
sensitive to the presence of new physics contributions to the $Z \rightarrow
b\bar{b}$ vertex. Allowing a vertex correction $\delta_{b\bar{b}}^{\rm new}$
one obtains the significantly lower value alpha_s = 0.111 \pm 0.009, in better
agreement with low energy determinations, and $\delta_{b\bar{b}}^{\rm new} =
0.023 \pm 0.011$. There is now enough data to perform more general fits to
parameters describing new physics effects and to separate these from $m_t$ and
$M_H$. Allowing the parameter $\rho_0$, which describes sources of $SU(2)$
breaking beyond the Standard Model, to be free one finds $\rho_0=1.0012 \pm
0.0017 \pm 0.0017$, remarkably close to unity. One can also separate the new
physics contributions to the oblique parameters $S_{\rm new}$, $T_{\rm new}$
and $U_{\rm new}$, which all take values consistent with zero. The effects of
supersymmetry on the determination of the SM parameters are discussed.
| [
{
"created": "Tue, 1 Nov 1994 21:50:08 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Erler",
"Jens",
""
],
[
"Langacker",
"Paul",
""
]
] | We discuss the consequences of recent experimental results from CDF, SLC, LEP and elsewhere for the Standard Model and for new physics. A global fit to all indirect precision data yields $m_t = 175 \pm 11^{+17}_{-19}$~GeV, $\sin^2\theta_{MS} = 0.2317(3)(2)$, and $\alpha_s = 0.127(5)(2)$, where the central values are for $M_H = 300$ GeV and the second uncertainties are for $M_H \rightarrow 1000$ GeV (+) and 60 GeV (-). The $m_t$ value is in remarkable agreement with the value $m_t=174 \pm 16$ GeV suggested by the CDF candidate events. There is a slight preference for a light Higgs with $M_H < 730$ (880) GeV at 95\% c.l. if the CDF $m_t$ value is (not) included. The sensitivity is, however, due almost entirely to the anomalously large observed values for the $Z \rightarrow b\bar{b}$ width and left-right asymmetry. The value of alpha_s (from the lineshape) is clean theoretically assuming the Standard Model, but is sensitive to the presence of new physics contributions to the $Z \rightarrow b\bar{b}$ vertex. Allowing a vertex correction $\delta_{b\bar{b}}^{\rm new}$ one obtains the significantly lower value alpha_s = 0.111 \pm 0.009, in better agreement with low energy determinations, and $\delta_{b\bar{b}}^{\rm new} = 0.023 \pm 0.011$. There is now enough data to perform more general fits to parameters describing new physics effects and to separate these from $m_t$ and $M_H$. Allowing the parameter $\rho_0$, which describes sources of $SU(2)$ breaking beyond the Standard Model, to be free one finds $\rho_0=1.0012 \pm 0.0017 \pm 0.0017$, remarkably close to unity. One can also separate the new physics contributions to the oblique parameters $S_{\rm new}$, $T_{\rm new}$ and $U_{\rm new}$, which all take values consistent with zero. The effects of supersymmetry on the determination of the SM parameters are discussed. |
2205.00808 | Raul Jimenez | Beatriz Hernandez-Molinero, Raul Jimenez, Carlos Pena-Garay | Distinguishing Dirac vs. Majorana Neutrinos: a Cosmological Probe | null | null | 10.1088/1475-7516/2022/08/038 | null | hep-ph astro-ph.CO | http://creativecommons.org/licenses/by-nc-nd/4.0/ | Cosmic background neutrinos ($C_{\nu}B)$ helicity composition is different
for Dirac or Majorana neutrinos making detectors based on $C_{\nu}B$ capture
sensitive to the nature of neutrinos. We calculate, for the first time, the
helicity changes of neutrinos crossing dark matter fields, to quantitatively
calculate this effect on the capture rate. We show that a fraction of neutrinos
change their helicity, regardless of them being deflected by a void or a dark
matter halo. The average signal from the 100 most massive voids or halos in a
Gpc$^3$ gives a prediction that if neutrinos are Dirac, the density of the
$C_{\nu} B$ background measured on Earth should be 48 cm${^{-3}}$ for
left-helical neutrinos, a decrease of 15% (53.6 cm${^{-3}}$; 5%) for a halo
(void) with respect to the standard calculation without including gravitational
effects due to large scale structures. In terms of the total capture rate in a
100 g tritium detector, this translates in $4.9^{+1.1}_{-0.8}$ neutrinos per
year for the Dirac case, as a function of the unknown neutrino mass scale, or
8.1 per year if neutrinos are Majorana. Thus although smaller than the factor
two for the non-relativistic case, it is still large enough to be detected and
it highlights the power of future $C_{\nu} B$ detectors, as an alternative to
neutrinoless double beta decay experiments, to discover the neutrino nature.
| [
{
"created": "Mon, 2 May 2022 11:00:40 GMT",
"version": "v1"
}
] | 2022-08-31 | [
[
"Hernandez-Molinero",
"Beatriz",
""
],
[
"Jimenez",
"Raul",
""
],
[
"Pena-Garay",
"Carlos",
""
]
] | Cosmic background neutrinos ($C_{\nu}B)$ helicity composition is different for Dirac or Majorana neutrinos making detectors based on $C_{\nu}B$ capture sensitive to the nature of neutrinos. We calculate, for the first time, the helicity changes of neutrinos crossing dark matter fields, to quantitatively calculate this effect on the capture rate. We show that a fraction of neutrinos change their helicity, regardless of them being deflected by a void or a dark matter halo. The average signal from the 100 most massive voids or halos in a Gpc$^3$ gives a prediction that if neutrinos are Dirac, the density of the $C_{\nu} B$ background measured on Earth should be 48 cm${^{-3}}$ for left-helical neutrinos, a decrease of 15% (53.6 cm${^{-3}}$; 5%) for a halo (void) with respect to the standard calculation without including gravitational effects due to large scale structures. In terms of the total capture rate in a 100 g tritium detector, this translates in $4.9^{+1.1}_{-0.8}$ neutrinos per year for the Dirac case, as a function of the unknown neutrino mass scale, or 8.1 per year if neutrinos are Majorana. Thus although smaller than the factor two for the non-relativistic case, it is still large enough to be detected and it highlights the power of future $C_{\nu} B$ detectors, as an alternative to neutrinoless double beta decay experiments, to discover the neutrino nature. |
1712.00083 | Santiago Cort\'es | Santiago Cort\'es, \'Angel G\'omez Nicola and John Morales | Free Energy of a Large-$N$ Pion Gas and Chiral Symmetry Restoration | 4 pages, 3 figures, conference paper | null | null | null | hep-ph | http://creativecommons.org/licenses/by-nc-sa/4.0/ | We study thermal properties of a large-N massless pion gas using a low-energy
QCD approach given by an $O(N +1)/O(N)$ Nonlinear Sigma Model. We build
diagrammatically the associated finite free energy to $O(TM^{3})$ in the pion
mass expansion through an effective vertex that considers all the contributions
coming from closed diagrams. Subsequently, we calculate finite order parameters
such as the quark condensate and its respective derivative, i.e., the scalar
susceptibility, in the chiral limit, along with their associated critical
exponents. These results are compared with our previous unitarized scattering
analyses for the chiral transition universality class, thus showing a
reasonable agreement both with lattice simulations and these resonant studies.
| [
{
"created": "Thu, 30 Nov 2017 21:09:52 GMT",
"version": "v1"
}
] | 2017-12-04 | [
[
"Cortés",
"Santiago",
""
],
[
"Nicola",
"Ángel Gómez",
""
],
[
"Morales",
"John",
""
]
] | We study thermal properties of a large-N massless pion gas using a low-energy QCD approach given by an $O(N +1)/O(N)$ Nonlinear Sigma Model. We build diagrammatically the associated finite free energy to $O(TM^{3})$ in the pion mass expansion through an effective vertex that considers all the contributions coming from closed diagrams. Subsequently, we calculate finite order parameters such as the quark condensate and its respective derivative, i.e., the scalar susceptibility, in the chiral limit, along with their associated critical exponents. These results are compared with our previous unitarized scattering analyses for the chiral transition universality class, thus showing a reasonable agreement both with lattice simulations and these resonant studies. |
0809.3772 | Marco Guzzi | Roberta Armillis, Claudio Coriano', Marco Guzzi and Simone Morelli | An Anomalous Extra Z Prime from Intersecting Branes with Drell-Yan and
Direct Photons at the LHC | 46 pages, 36 figures, comments and citations added | Nucl.Phys.B814:156-179,2009 | 10.1016/j.nuclphysb.2009.01.016 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We quantify the impact of gauge anomalies at the Large Hadron Collider by
studying the invariant mass distributions in Drell-Yan and in double prompt
photon, using an extension of the Standard Model characterized by an additional
anomalous U(1) derived from intersecting branes. The approach is rather general
and applies to any anomalous abelian gauge current. Anomalies are cancelled
using either the Wess-Zumino mechanism with suitable Peccei-Quinn-like
interactions and a Stueckelberg axion, or by the Green-Schwarz mechanism. We
compare predictions for the corresponding extra Z-prime to anomaly-free
realizations such as those involving U(1)_{B-L}. We identify the leading
anomalous corrections to both channels, which contribute at higher orders, and
compare them against the next-to-next-to-leading order (NNLO) QCD background.
Anomalous effects in these inclusive observables are found to be very small,
far below the percent level and below the size of the typical QCD corrections
quantified by NNLO K-factors.
| [
{
"created": "Mon, 22 Sep 2008 19:17:24 GMT",
"version": "v1"
},
{
"created": "Sat, 4 Oct 2008 08:27:38 GMT",
"version": "v2"
}
] | 2014-11-18 | [
[
"Armillis",
"Roberta",
""
],
[
"Coriano'",
"Claudio",
""
],
[
"Guzzi",
"Marco",
""
],
[
"Morelli",
"Simone",
""
]
] | We quantify the impact of gauge anomalies at the Large Hadron Collider by studying the invariant mass distributions in Drell-Yan and in double prompt photon, using an extension of the Standard Model characterized by an additional anomalous U(1) derived from intersecting branes. The approach is rather general and applies to any anomalous abelian gauge current. Anomalies are cancelled using either the Wess-Zumino mechanism with suitable Peccei-Quinn-like interactions and a Stueckelberg axion, or by the Green-Schwarz mechanism. We compare predictions for the corresponding extra Z-prime to anomaly-free realizations such as those involving U(1)_{B-L}. We identify the leading anomalous corrections to both channels, which contribute at higher orders, and compare them against the next-to-next-to-leading order (NNLO) QCD background. Anomalous effects in these inclusive observables are found to be very small, far below the percent level and below the size of the typical QCD corrections quantified by NNLO K-factors. |
0706.0827 | Vojtech Kundrat | Vojtech Kundrat, Milos Lokajicek and Ivo Vrkoc | Limited validity of West and Yennie integral formula for elastic
scattering of hadrons | 5 pages | Phys.Lett.B656:182-185,2007 | 10.1016/j.physletb.2007.09.030 | null | hep-ph | null | The commonly used West and Yennie integral formula for the relative phase
between the Coulomb and elastic hadronic amplitudes might be consistently
applied to only if the hadronic amplitude had the constant ratio of the real to
the imaginary parts al all kinematically allowed values of four momentum
transfer squared.
| [
{
"created": "Wed, 6 Jun 2007 13:55:22 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Kundrat",
"Vojtech",
""
],
[
"Lokajicek",
"Milos",
""
],
[
"Vrkoc",
"Ivo",
""
]
] | The commonly used West and Yennie integral formula for the relative phase between the Coulomb and elastic hadronic amplitudes might be consistently applied to only if the hadronic amplitude had the constant ratio of the real to the imaginary parts al all kinematically allowed values of four momentum transfer squared. |
1709.09213 | Azeem Mir Mr | Azeem Mir, Farida Tahir, Shakeel Mahmood, Shi- Hai Dong | Study of rare mesonic decays involving di-neutrinos in their final state | null | Advances in High Energy Physics (2018) | 10.1155/2018/4176840 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have carried out phenomenological implication of R-parity violating
($\NEG% {R}_{p}$) Minimal Supersymmetric Model (MSSM) via analyses of pure
leptonic($% M\rightarrow \nu \bar{\nu}$) and semileptonic decays of
pseudo-scalar mesons(% $M\rightarrow X\nu \bar{\nu}$). These analyses involve
prediction of branching fraction of pure leptonic decays by using experimental
limits/bounds derived from the study of semileptonic decays on $\NEG{R}_{p}$
parameters. We have found, in general that $\NEG{R}_{p}$ contribution dominates
over the SM contribution i.e., by a factor of $10^{2}$ for the semleptonic
decays of $K^{0}$, $10$ for the pure leptonic decays of $K_{L,S}$ , while
$10^{2}~$\& $10^{4}$ in case of $B_{s}$ and $B_{d}$ respectively. This
demonstrates the role of $\NEG{R}_{p}$ as a viable model for the study of NP
contribution in rare decays.
| [
{
"created": "Tue, 26 Sep 2017 18:35:25 GMT",
"version": "v1"
}
] | 2022-02-16 | [
[
"Mir",
"Azeem",
""
],
[
"Tahir",
"Farida",
""
],
[
"Mahmood",
"Shakeel",
""
],
[
"Dong",
"Shi- Hai",
""
]
] | We have carried out phenomenological implication of R-parity violating ($\NEG% {R}_{p}$) Minimal Supersymmetric Model (MSSM) via analyses of pure leptonic($% M\rightarrow \nu \bar{\nu}$) and semileptonic decays of pseudo-scalar mesons(% $M\rightarrow X\nu \bar{\nu}$). These analyses involve prediction of branching fraction of pure leptonic decays by using experimental limits/bounds derived from the study of semileptonic decays on $\NEG{R}_{p}$ parameters. We have found, in general that $\NEG{R}_{p}$ contribution dominates over the SM contribution i.e., by a factor of $10^{2}$ for the semleptonic decays of $K^{0}$, $10$ for the pure leptonic decays of $K_{L,S}$ , while $10^{2}~$\& $10^{4}$ in case of $B_{s}$ and $B_{d}$ respectively. This demonstrates the role of $\NEG{R}_{p}$ as a viable model for the study of NP contribution in rare decays. |
2311.00125 | Luiz Lopes | Luiz L. Lopes, Debora P. Menezes, Mateus R. Pelicer | Correlation between the symmetry energy slope and the deconfinement
phase transition | Published version | Phys. Rev. C 109, 045801 (2024) | 10.1103/PhysRevC.109.045801 | null | hep-ph astro-ph.HE nucl-th | http://creativecommons.org/licenses/by/4.0/ | We study how the nuclear symmetry energy slope ($L$) can affect the
hadron-quark phase transition and neutron star properties. We show that the
main physical quantities as the critical chemical potential and pressure are
strongly influenced by the symmetry energy slope. In extreme cases, the total
amount of deconfined quarks can reach up to 99$\%$ of the hybrid star mass.
| [
{
"created": "Tue, 31 Oct 2023 19:56:17 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Apr 2024 18:14:46 GMT",
"version": "v2"
}
] | 2024-04-03 | [
[
"Lopes",
"Luiz L.",
""
],
[
"Menezes",
"Debora P.",
""
],
[
"Pelicer",
"Mateus R.",
""
]
] | We study how the nuclear symmetry energy slope ($L$) can affect the hadron-quark phase transition and neutron star properties. We show that the main physical quantities as the critical chemical potential and pressure are strongly influenced by the symmetry energy slope. In extreme cases, the total amount of deconfined quarks can reach up to 99$\%$ of the hybrid star mass. |
0909.2799 | Carlos E. Yaguna | A. Goudelis, Y. Mambrini, C. Yaguna | Antimatter signals of singlet scalar dark matter | 24 pages, 8 figures. v2: minor improvements. Accepted for publication
in JCAP | JCAP 0912:008,2009 | 10.1088/1475-7516/2009/12/008 | IFT-UAM/CSIC-09-42 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the singlet scalar model of dark matter and study the expected
antiproton and positron signals from dark matter annihilations. The regions of
the viable parameter space of the model that are excluded by present data are
determined, as well as those regions that will be probed by the forthcoming
experiment AMS-02. In all cases, different propagation models are investigated,
and the possible enhancement due to dark matter substructures is analyzed. We
find that the antiproton signal is more easily detectable than the positron one
over the whole parameter space. For a typical propagation model and without any
boost factor, AMS-02 will be able to probe --via antiprotons-- the singlet
model of dark matter up to masses of 600 GeV. Antiprotons constitute,
therefore, a promising signal to constraint or detect the singlet scalar model.
| [
{
"created": "Tue, 15 Sep 2009 13:25:22 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Nov 2009 16:30:28 GMT",
"version": "v2"
}
] | 2009-12-15 | [
[
"Goudelis",
"A.",
""
],
[
"Mambrini",
"Y.",
""
],
[
"Yaguna",
"C.",
""
]
] | We consider the singlet scalar model of dark matter and study the expected antiproton and positron signals from dark matter annihilations. The regions of the viable parameter space of the model that are excluded by present data are determined, as well as those regions that will be probed by the forthcoming experiment AMS-02. In all cases, different propagation models are investigated, and the possible enhancement due to dark matter substructures is analyzed. We find that the antiproton signal is more easily detectable than the positron one over the whole parameter space. For a typical propagation model and without any boost factor, AMS-02 will be able to probe --via antiprotons-- the singlet model of dark matter up to masses of 600 GeV. Antiprotons constitute, therefore, a promising signal to constraint or detect the singlet scalar model. |
1606.07666 | Mustafa Savci | A. K. Agamaliev (1), T. M. Aliev (2), M. Savc{\i} (2) ((1) Faculty of
Physics, Baku State University, (2) Middle East Technical University, Ankara,
Turkey) | Radiative decays of negative parity heavy baryons in QCD | 19 pages, 2 figures, LaTeX formatted | null | null | metu-phys-hep-16-07 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The transition form factors responsible for the radiative $\Sigma_Q \to
\Lambda_Q \gamma$ and $\Xi_Q^\prime \to \Xi \gamma$ decays of the negative
parity baryons are examined within light cone QCD sum rules. The decay widths
of the radiative transitions are calculated using the obtained results of the
form factors.
| [
{
"created": "Fri, 24 Jun 2016 12:50:01 GMT",
"version": "v1"
}
] | 2016-06-27 | [
[
"Agamaliev",
"A. K.",
""
],
[
"Aliev",
"T. M.",
""
],
[
"Savcı",
"M.",
""
]
] | The transition form factors responsible for the radiative $\Sigma_Q \to \Lambda_Q \gamma$ and $\Xi_Q^\prime \to \Xi \gamma$ decays of the negative parity baryons are examined within light cone QCD sum rules. The decay widths of the radiative transitions are calculated using the obtained results of the form factors. |
0812.2236 | Brett D. Altschul | Brett Altschul | Lorentz Violation and Alpha-Decay | 16 pages | Phys.Rev.D79:016004,2009 | 10.1103/PhysRevD.79.016004 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Relating the effective Lorentz violation coefficients for composite particles
to the coefficients for their constituent fields is a challenging problem. We
calculate the Lorentz violation coefficients relevant to the dynamics of an
alpha-particle in terms of proton and neutron coefficients. The alpha-particle
coefficients would lead to anisotropies in the alpha-decays of nuclei, and
because the decay process involves quantum tunneling, the effects of any
Lorentz violations could be exponentially enhanced.
| [
{
"created": "Thu, 11 Dec 2008 20:23:58 GMT",
"version": "v1"
}
] | 2010-01-08 | [
[
"Altschul",
"Brett",
""
]
] | Relating the effective Lorentz violation coefficients for composite particles to the coefficients for their constituent fields is a challenging problem. We calculate the Lorentz violation coefficients relevant to the dynamics of an alpha-particle in terms of proton and neutron coefficients. The alpha-particle coefficients would lead to anisotropies in the alpha-decays of nuclei, and because the decay process involves quantum tunneling, the effects of any Lorentz violations could be exponentially enhanced. |
2303.07395 | Nikolaos Syrrakos | Nikolaos Syrrakos | Two-loop master integrals for a planar and a non-planar topology
relevant for single top production | v1: 22 pages, ancillary files attached and in this link
https://github.com/nsyrrakos/SingleTop1mass.git; v2: Fixed minor typos and
added numerical check with AMFlow, matches published version (JHEP); | null | 10.1007/JHEP05(2023)131 | TUM-HEP 1454/23 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We provide analytic results for two-loop four-point master integrals with one
massive propagator and one massive leg relevant to single top production.
Canonical bases of master integrals are constructed and the Simplified
Differential Equations approach is employed for their analytic solution. The
necessary boundary terms are computed in closed form in the dimensional
regulator, allowing us to obtain analytic results in terms of multiple
polylogarithms of arbitrary transcendental weight. We provide explicit
solutions of all two-loop master integrals up to transcendental weight six and
discuss their numerical evaluation for Euclidean and physical phase-space
points.
| [
{
"created": "Mon, 13 Mar 2023 18:18:42 GMT",
"version": "v1"
},
{
"created": "Mon, 15 May 2023 12:49:48 GMT",
"version": "v2"
}
] | 2023-05-31 | [
[
"Syrrakos",
"Nikolaos",
""
]
] | We provide analytic results for two-loop four-point master integrals with one massive propagator and one massive leg relevant to single top production. Canonical bases of master integrals are constructed and the Simplified Differential Equations approach is employed for their analytic solution. The necessary boundary terms are computed in closed form in the dimensional regulator, allowing us to obtain analytic results in terms of multiple polylogarithms of arbitrary transcendental weight. We provide explicit solutions of all two-loop master integrals up to transcendental weight six and discuss their numerical evaluation for Euclidean and physical phase-space points. |
hep-ph/9710511 | Dietmar Ebert | D.Ebert (Humboldt University, Berlin) | Bosonization in Particle Physics | 12 pages, LaTeX, uses lamuphys.sty, 5 LaTeX figures, talk given at
the Workshop "Field Theoretical Tools in Polymer and Particle Physics",
University Wuppertal, June 17-19, 1997 | null | 10.1007/BFb0106879 | HUB-EP-97/79 | hep-ph | null | Path integral techniques in collective fields are shown to be a useful
analytical tool to reformulate a field theory defined in terms of microscopic
quark (gluon) degrees of freedom as an effective theory of collective boson
(meson) fields. For illustrations, the path integral bosonization approach is
applied to derive a (non)linear sigma model from a Nambu-Jona-Lasinio (NJL)
quark model. The method can be extended to include higher order derivative
terms in meson fields or heavy-quark symmetries. It is also approximately
applicable to QCD.
| [
{
"created": "Tue, 28 Oct 1997 16:36:11 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Ebert",
"D.",
"",
"Humboldt University, Berlin"
]
] | Path integral techniques in collective fields are shown to be a useful analytical tool to reformulate a field theory defined in terms of microscopic quark (gluon) degrees of freedom as an effective theory of collective boson (meson) fields. For illustrations, the path integral bosonization approach is applied to derive a (non)linear sigma model from a Nambu-Jona-Lasinio (NJL) quark model. The method can be extended to include higher order derivative terms in meson fields or heavy-quark symmetries. It is also approximately applicable to QCD. |
2211.08431 | Tao Xu | Thomas C. Gehrman, Barmak Shams Es Haghi, Kuver Sinha and Tao Xu | Baryogenesis, Primordial Black Holes and MHz-GHz Gravitational Waves | 35 pages, 9 figures. v2: added references, corrected a typo in Eq.
(3.12), version published in JCAP | null | 10.1088/1475-7516/2023/02/062 | UTWI-16-2022 | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational waves (GWs) in the MHz - GHz frequency range are motivated by a
host of early Universe phenomena such as oscillons, preheating, and cosmic
strings. We point out that baryogenesis too serves as a motivation to probe GWs
in this frequency range. The connection is through primordial black holes
(PBHs): on the one hand, PBHs induce baryogenesis by Hawking evaporating into a
species that has baryon number and $CP$ violating decays; on the other, PBHs
induce GWs through second order effects when the scalar fluctuations
responsible for their formation re-enter the horizon. We describe the interplay
of the parameters responsible for successful baryogenesis on the plane of the
strain and frequency of the induced GWs, being careful to delineate regimes
where PBH domination or washout effects occur. We provide semi-analytic
scalings of the GW strain with the baryon number to entropy ratio and other
parameters important for baryogenesis. Along the way, we sketch a solution to
the dark matter-baryogenesis coincidence problem with two populations of PBHs,
which leads to a double-peaked GW signal. Our results underscore the importance
of probing the ultra high frequency GW frontier.
| [
{
"created": "Tue, 15 Nov 2022 19:00:00 GMT",
"version": "v1"
},
{
"created": "Sat, 11 Mar 2023 10:53:22 GMT",
"version": "v2"
}
] | 2023-03-14 | [
[
"Gehrman",
"Thomas C.",
""
],
[
"Haghi",
"Barmak Shams Es",
""
],
[
"Sinha",
"Kuver",
""
],
[
"Xu",
"Tao",
""
]
] | Gravitational waves (GWs) in the MHz - GHz frequency range are motivated by a host of early Universe phenomena such as oscillons, preheating, and cosmic strings. We point out that baryogenesis too serves as a motivation to probe GWs in this frequency range. The connection is through primordial black holes (PBHs): on the one hand, PBHs induce baryogenesis by Hawking evaporating into a species that has baryon number and $CP$ violating decays; on the other, PBHs induce GWs through second order effects when the scalar fluctuations responsible for their formation re-enter the horizon. We describe the interplay of the parameters responsible for successful baryogenesis on the plane of the strain and frequency of the induced GWs, being careful to delineate regimes where PBH domination or washout effects occur. We provide semi-analytic scalings of the GW strain with the baryon number to entropy ratio and other parameters important for baryogenesis. Along the way, we sketch a solution to the dark matter-baryogenesis coincidence problem with two populations of PBHs, which leads to a double-peaked GW signal. Our results underscore the importance of probing the ultra high frequency GW frontier. |
1311.6219 | Joel Walker | Joel W. Walker | A Complete Solution Classification and Unified Algorithmic Treatment for
the One- and Two-Step Asymmetric S-Transverse Mass (MT2) Event Scale
Statistic | As published in JHEP; appendices address combinatoric event assembly,
algorithm validation, and a complete pseudocode; program revision included as
ancillary file; 32 pages; 6 illustrated event case studies; 7 footnoted event
case studies | JHEP 1408 (2014) 155 | 10.1007/JHEP08(2014)155 | NSF-KITP-13-169 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The MT2 or "s-transverse mass" statistic was developed to associate a parent
mass scale to a missing transverse energy signature, given that escaping
particles are generally expected in pairs, while collider experiments are
sensitive to just a single transverse momentum vector sum. This document
focuses on the generalized extension of that statistic to asymmetric one- and
two-step decay chains, with arbitrary child particle masses and upstream
missing transverse momentum. It provides a unified theoretical formulation,
complete solution classification, taxonomy of critical points, and technical
algorithmic prescription for treatment of the MT2 event scale. An
implementation of the described algorithm is available for download, and is
also a deployable component of the author's selection cut software package
AEACuS (Algorithmic Event Arbiter and Cut Selector). Appendices address
combinatoric event assembly, algorithm validation, and a complete pseudocode.
| [
{
"created": "Mon, 25 Nov 2013 07:28:01 GMT",
"version": "v1"
},
{
"created": "Fri, 29 Aug 2014 23:24:34 GMT",
"version": "v2"
}
] | 2014-09-02 | [
[
"Walker",
"Joel W.",
""
]
] | The MT2 or "s-transverse mass" statistic was developed to associate a parent mass scale to a missing transverse energy signature, given that escaping particles are generally expected in pairs, while collider experiments are sensitive to just a single transverse momentum vector sum. This document focuses on the generalized extension of that statistic to asymmetric one- and two-step decay chains, with arbitrary child particle masses and upstream missing transverse momentum. It provides a unified theoretical formulation, complete solution classification, taxonomy of critical points, and technical algorithmic prescription for treatment of the MT2 event scale. An implementation of the described algorithm is available for download, and is also a deployable component of the author's selection cut software package AEACuS (Algorithmic Event Arbiter and Cut Selector). Appendices address combinatoric event assembly, algorithm validation, and a complete pseudocode. |
hep-ph/0508161 | Kyoungchul Kong | Asesh K. Datta, Kyoungchul Kong, Konstantin T. Matchev | The impact of beamstrahlung on precision measurements at CLIC | 6 pages, 8 figures, to appear in the proceedings of the 2005
International Linear Collider Workshop, Stanford, USA | ECONF C050318:0215,2005 | null | UFIFT-HEP-05-20, MCTP-05-88 | hep-ph | null | We review two commonly used approximate treatments of beamstrahlung at lepton
colliders. We discuss the applicability of those approximations and show that
they are bound to fail at very high energy $e^+e^-$ colliders such as CLIC. We
model the beamstrahlung effects at CLIC by an exact numerical solution to the
evolution equation for beamstrahlung and compare to the two approximations. We
also discuss the impact of beamstrahlung on precision measurements of new
physics parameters. As an illustration we consider Kaluza-Klein lepton
production in Universal Extra Dimensions and study the deterioration of the
endpoint lepton energy spectrum caused by beamstrahlung.
| [
{
"created": "Sun, 14 Aug 2005 04:07:05 GMT",
"version": "v1"
}
] | 2009-10-09 | [
[
"Datta",
"Asesh K.",
""
],
[
"Kong",
"Kyoungchul",
""
],
[
"Matchev",
"Konstantin T.",
""
]
] | We review two commonly used approximate treatments of beamstrahlung at lepton colliders. We discuss the applicability of those approximations and show that they are bound to fail at very high energy $e^+e^-$ colliders such as CLIC. We model the beamstrahlung effects at CLIC by an exact numerical solution to the evolution equation for beamstrahlung and compare to the two approximations. We also discuss the impact of beamstrahlung on precision measurements of new physics parameters. As an illustration we consider Kaluza-Klein lepton production in Universal Extra Dimensions and study the deterioration of the endpoint lepton energy spectrum caused by beamstrahlung. |
hep-ph/0109220 | Mrinal Dasgupta | Mrinal Dasgupta | Power Corrections in QCD | 10 pages, 5 figures. Contribution submitted to Ringberg workshop on
HERA physics, Ringberg Castle, June 2001 | J.Phys.G28:907-914,2002 | 10.1088/0954-3899/28/5/315 | null | hep-ph | null | This article provides a review of progress made in understanding inverse
power law corrections 1/Q^p where Q is the hard scale for a given QCD
observable. Special emphasis is given to comparisons of theory with HERA
results.
| [
{
"created": "Mon, 24 Sep 2001 16:37:38 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Dasgupta",
"Mrinal",
""
]
] | This article provides a review of progress made in understanding inverse power law corrections 1/Q^p where Q is the hard scale for a given QCD observable. Special emphasis is given to comparisons of theory with HERA results. |
1904.12415 | Kang Xian-Wei | Xiao-Dong Shi, Xian-Wei Kang, Ikaros Bigi, Wei-Ping Wang, Hai-Ping
Peng | Prospects for CP & P violation in $\Lambda_{c}^+$ decay at STCF | final version, to appear in PRD | Phys. Rev. D 100, 113002 (2019) | 10.1103/PhysRevD.100.113002 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | CP violation is an excellent tool for probing flavor dynamics as we learnt
first with $K_L \to 2 \pi$ and later also with the weak decays of beauty
mesons. LHCb 2019 data have shown CP violation for the first time in $D^0\to
K^-K^+$ vs. $D^0\to\pi^-\pi^+$. Searching for CP asymmetries is of great
interest in charm quark sector in the Standard Model (SM) or even more beyond
it. In charm hadron decays, lots of work had focused on two-body final states,
and the measurements of CP asymmetries in three- or four-body final states are
rare. Dalitz plots have shown an excellent record for three-body final states,
and more results are desired for four-body ones. In this work we study CP
asymmetries in the decays $\Lambda^+_c \to p K^-\pi^+\pi^0$/$\Lambda
\pi^+\pi^+\pi^-$/$pK_S\pi^+\pi^-$, where the SM gives zero values for the first
two channels, while $3.3 \times 10^{-3}$ for the last one due to $K^0 - \bar
K^0$ oscillation. We performed a fast Monte Carlo simulation study by using
electron-positron annihilation data of 1~$\textrm{ab}^{-1}$ at center-of-mass
energy $\sqrt{s}\, =\, 4.64$ GeV. The data is expected to be available by the
next generation Super Tau Charm Facility proposed by China and Russia with one
year (or even less) data taking operation. The results indicate that a
sensitivity at the level of 0.2$\sim$0.5% is accessible for these processes,
which would be enough to measure nonzero CP-violating asymmetries as large as
1%.
| [
{
"created": "Mon, 29 Apr 2019 01:27:29 GMT",
"version": "v1"
},
{
"created": "Wed, 31 Jul 2019 06:46:26 GMT",
"version": "v2"
},
{
"created": "Wed, 16 Oct 2019 00:52:20 GMT",
"version": "v3"
},
{
"created": "Sat, 23 Nov 2019 03:51:23 GMT",
"version": "v4"
}
] | 2019-12-11 | [
[
"Shi",
"Xiao-Dong",
""
],
[
"Kang",
"Xian-Wei",
""
],
[
"Bigi",
"Ikaros",
""
],
[
"Wang",
"Wei-Ping",
""
],
[
"Peng",
"Hai-Ping",
""
]
] | CP violation is an excellent tool for probing flavor dynamics as we learnt first with $K_L \to 2 \pi$ and later also with the weak decays of beauty mesons. LHCb 2019 data have shown CP violation for the first time in $D^0\to K^-K^+$ vs. $D^0\to\pi^-\pi^+$. Searching for CP asymmetries is of great interest in charm quark sector in the Standard Model (SM) or even more beyond it. In charm hadron decays, lots of work had focused on two-body final states, and the measurements of CP asymmetries in three- or four-body final states are rare. Dalitz plots have shown an excellent record for three-body final states, and more results are desired for four-body ones. In this work we study CP asymmetries in the decays $\Lambda^+_c \to p K^-\pi^+\pi^0$/$\Lambda \pi^+\pi^+\pi^-$/$pK_S\pi^+\pi^-$, where the SM gives zero values for the first two channels, while $3.3 \times 10^{-3}$ for the last one due to $K^0 - \bar K^0$ oscillation. We performed a fast Monte Carlo simulation study by using electron-positron annihilation data of 1~$\textrm{ab}^{-1}$ at center-of-mass energy $\sqrt{s}\, =\, 4.64$ GeV. The data is expected to be available by the next generation Super Tau Charm Facility proposed by China and Russia with one year (or even less) data taking operation. The results indicate that a sensitivity at the level of 0.2$\sim$0.5% is accessible for these processes, which would be enough to measure nonzero CP-violating asymmetries as large as 1%. |
hep-ph/9310323 | null | X. Artru | Proposals for measuring transversity distributions in deep inelastic
electron scattering and a model for E-704 asymmetries | (Contribution to the V$^{th}$ International Workshop on High Energy
Spin Physics, SPIN-93, September 20-24, 1993, Protvino, Russia), 4 LateX
pages + 1 page for figures, report # LYCEN/9353 | null | null | null | hep-ph | null | We present the principles of the measurement of the quark transversity
distributions in semi-inclusive deep inelastic electron scattering, which form
the basis of HELP and one of the ELFE proposals. A string model for
Collins-type asymmetry in polarized quark fragmentation function is proposed. A
possible role of the Collins effect in the single spin asymmetries observed by
experiment E 704 at Fermilab is suggested.
| [
{
"created": "Wed, 20 Oct 1993 17:37:23 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Artru",
"X.",
""
]
] | We present the principles of the measurement of the quark transversity distributions in semi-inclusive deep inelastic electron scattering, which form the basis of HELP and one of the ELFE proposals. A string model for Collins-type asymmetry in polarized quark fragmentation function is proposed. A possible role of the Collins effect in the single spin asymmetries observed by experiment E 704 at Fermilab is suggested. |
2312.14012 | Yao Ma | Yao Ma | Identifying regions in wide-angle scattering via graph-theoretical
approaches | 166 pages, 61 figures | null | null | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The method of regions, which provides a systematic approach for computing
Feynman integrals involving multiple kinematic scales, proposes that a Feynman
integral can be approximated and even reproduced by summing over integrals
expanded in certain regions. A modern perspective of the method of regions
considers any given Feynman integral as a specific Newton polytope, defined as
the convex hull of the points associated with Symanzik polynomials. The regions
then correspond one-to-one with the lower facets of this polytope.
As Symanzik polynomials correspond to the spanning trees and spanning 2-trees
of the Feynman graph, a graph-theoretical study of these polynomials may allow
us to identify the complete set of regions for a given expansion. In this work,
our primary focus is on three specific expansions: the on-shell expansion of
generic wide-angle scattering, the soft expansion of generic wide-angle
scattering, and the mass expansion of heavy-to-light decay. For each of these
expansions, we employ graph-theoretical approaches to derive the generic forms
of the regions involved in the method of regions. The results, applicable to
all orders, offer insights that can be leveraged to investigate various aspects
of scattering amplitudes.
| [
{
"created": "Thu, 21 Dec 2023 16:41:03 GMT",
"version": "v1"
},
{
"created": "Sun, 7 Jul 2024 23:41:01 GMT",
"version": "v2"
}
] | 2024-07-09 | [
[
"Ma",
"Yao",
""
]
] | The method of regions, which provides a systematic approach for computing Feynman integrals involving multiple kinematic scales, proposes that a Feynman integral can be approximated and even reproduced by summing over integrals expanded in certain regions. A modern perspective of the method of regions considers any given Feynman integral as a specific Newton polytope, defined as the convex hull of the points associated with Symanzik polynomials. The regions then correspond one-to-one with the lower facets of this polytope. As Symanzik polynomials correspond to the spanning trees and spanning 2-trees of the Feynman graph, a graph-theoretical study of these polynomials may allow us to identify the complete set of regions for a given expansion. In this work, our primary focus is on three specific expansions: the on-shell expansion of generic wide-angle scattering, the soft expansion of generic wide-angle scattering, and the mass expansion of heavy-to-light decay. For each of these expansions, we employ graph-theoretical approaches to derive the generic forms of the regions involved in the method of regions. The results, applicable to all orders, offer insights that can be leveraged to investigate various aspects of scattering amplitudes. |
hep-ph/9609365 | Otto Nachtmann | O. Nachtmann (Univ. Heidelberg) | High Energy Collisions and Nonperturbative QCD | LaTeX, 93 pages; 32 figures available from the author. Lectures given
at Banz (Germany) 1993 and at Schladming (Austria) 1996 | null | 10.1007/BFb0105857 | HD-THEP-96-38 | hep-ph | null | We discuss various ideas on the nonperturbative vacuum structure in QCD. The
stochastic vacuum model of Dosch and Simonov is presented in some detail. We
show how this model produces confinement. The model incorporates the idea of
the QCD vacuum acting like a dual superconductor due to an effective
chromomagnetic monopole condensate. We turn then to high energy, small momentum
transfer hadron-hadron scattering. A field-theoretic formalism to treat these
reactions is developed, where the basic quantities governing the scattering
amplitudes are correlation functions of light-like Wegner-Wilson lines and
loops. The evaluation of these correlation functions with the help of the
Minkowskian version of the stochastic vacuum model is discussed. A further
surprising manifestation of the nontrivial vacuum structure in QCD may be the
production of anomalous soft photons in hadron-hadron collisions. We interpret
these photons as being due to `synchrotron radiation from the vacuum'. A
duality argument leads us from there to the expectation of anomalous pieces
proportional to $(Q^2)^{1/6}$ in the electric form factors of the nucleons for
small $Q^2$. Finally we sketch the idea that in the Drell-Yan reaction, where a
quark-antiquark pair annihilates with the production of a lepton pair, a
`chromodynamic Sokolov-Ternov effect' may be at work. This leads to a spin
correlation of the $q\bar q$ pair, observable through the angular distribution
of the lepton pair.
| [
{
"created": "Mon, 16 Sep 1996 13:44:09 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Nachtmann",
"O.",
"",
"Univ. Heidelberg"
]
] | We discuss various ideas on the nonperturbative vacuum structure in QCD. The stochastic vacuum model of Dosch and Simonov is presented in some detail. We show how this model produces confinement. The model incorporates the idea of the QCD vacuum acting like a dual superconductor due to an effective chromomagnetic monopole condensate. We turn then to high energy, small momentum transfer hadron-hadron scattering. A field-theoretic formalism to treat these reactions is developed, where the basic quantities governing the scattering amplitudes are correlation functions of light-like Wegner-Wilson lines and loops. The evaluation of these correlation functions with the help of the Minkowskian version of the stochastic vacuum model is discussed. A further surprising manifestation of the nontrivial vacuum structure in QCD may be the production of anomalous soft photons in hadron-hadron collisions. We interpret these photons as being due to `synchrotron radiation from the vacuum'. A duality argument leads us from there to the expectation of anomalous pieces proportional to $(Q^2)^{1/6}$ in the electric form factors of the nucleons for small $Q^2$. Finally we sketch the idea that in the Drell-Yan reaction, where a quark-antiquark pair annihilates with the production of a lepton pair, a `chromodynamic Sokolov-Ternov effect' may be at work. This leads to a spin correlation of the $q\bar q$ pair, observable through the angular distribution of the lepton pair. |
hep-ph/9706434 | Jose Wudka | Jose Wudka | Non-standard t production at the NLC | 8 pages, 5 figures. Requires epsfig.sty. References have been updated
and corresponding comments added. Talk presented in Beyond the Standard Model
V, April 29 - May 4, 1997, Kvikne's Hotel, Balholm, Norway | null | 10.1063/1.54450 | UCRHEP-T192 | hep-ph | null | The top-quark system as a probe for new physics is considered using a
consistent, gauge-invariant effective Lagrangian approach. The magnitude of new
effects is estimated and the results are applied to top production through W
fusion. Other processes are also briefly discussed.
| [
{
"created": "Fri, 20 Jun 1997 16:40:05 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Jun 1997 00:53:59 GMT",
"version": "v2"
}
] | 2009-10-30 | [
[
"Wudka",
"Jose",
""
]
] | The top-quark system as a probe for new physics is considered using a consistent, gauge-invariant effective Lagrangian approach. The magnitude of new effects is estimated and the results are applied to top production through W fusion. Other processes are also briefly discussed. |
hep-ph/0105173 | Nam-Young Lee | Nam-Young Lee (1), K. Goeke (1) and C. Weiss (2) ((1)Ruhr U.,Bochum,
(2)Regensburg U.) | Spin-dependent twist-4 matrix elements from the instanton vacuum:
Flavor-singlet and nonsinglet | 17 pages, 4 eps figures included | Phys.Rev.D65:054008,2002 | 10.1103/PhysRevD.65.054008 | RUB-TPII-06/01 | hep-ph | null | We estimate the twist-4 spin-1 nucleon matrix element f_2 in an
instanton-based description of the QCD vacuum. In addition to the
flavor-nonsinglet we compute also the flavor-singlet matrix element, which
appears in next-to-leading order of the (1/N_c)-expansion. The corresponding
twist-3 spin-2 matrix elements d_2 are suppressed in the packing fraction of
the instanton medium, (\bar \rho)/(\bar R) << 1. We use our results to estimate
the leading (1/Q^2) power corrections to the first moment of the proton and
neutron spin structure functions G_1, as well as the intrinsic charm
contribution to the nucleon spin.
| [
{
"created": "Thu, 17 May 2001 13:16:09 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Lee",
"Nam-Young",
""
],
[
"Goeke",
"K.",
""
],
[
"Weiss",
"C.",
""
]
] | We estimate the twist-4 spin-1 nucleon matrix element f_2 in an instanton-based description of the QCD vacuum. In addition to the flavor-nonsinglet we compute also the flavor-singlet matrix element, which appears in next-to-leading order of the (1/N_c)-expansion. The corresponding twist-3 spin-2 matrix elements d_2 are suppressed in the packing fraction of the instanton medium, (\bar \rho)/(\bar R) << 1. We use our results to estimate the leading (1/Q^2) power corrections to the first moment of the proton and neutron spin structure functions G_1, as well as the intrinsic charm contribution to the nucleon spin. |
hep-ph/9608377 | Weuber da Silva Freitas | A. C. B. Antunes and L. J. Antunes | Mass effects in a Three-Body System Bound by Harmonic Oscilators | 6 pages, latex, no figures | null | null | null | hep-ph | null | The problem of three different masses bound by harmonic oscillator potentials
is solved exactly. It is shown that Jacobi coordinates cannot, in general,
decouple this system into two three-dimensional oscillators but this decoupling
can always be obtained in terms of the normal coordinates. The condition for
the decoupling in Jacobi coordinates is given. It is shown that the mean
distance between each pair of particles depends upon their masses.
| [
{
"created": "Tue, 20 Aug 1996 16:18:03 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Antunes",
"A. C. B.",
""
],
[
"Antunes",
"L. J.",
""
]
] | The problem of three different masses bound by harmonic oscillator potentials is solved exactly. It is shown that Jacobi coordinates cannot, in general, decouple this system into two three-dimensional oscillators but this decoupling can always be obtained in terms of the normal coordinates. The condition for the decoupling in Jacobi coordinates is given. It is shown that the mean distance between each pair of particles depends upon their masses. |
1701.07337 | Martin Rohrmoser | Martin Rohrmoser, Ki-Seok Choi, Willibald Plessas | Flavor analysis of nucleon, $\Delta$, and hyperon electromagnetic form
factors | null | null | 10.1007/s00601-017-1243-0 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | By the analysis of the world data base of elastic electron scattering on the
proton and the neutron (for the latter, in fact, on $^2H$ and $^3He$) important
experimental insights have recently been gained into the flavor compositions of
nucleon electromagnetic form factors. We report on testing the Graz
Goldstone-boson-exchange relativistic constituent-quark model in comparison to
the flavor contents in low-energy nucleons, as revealed from
electron-scattering phenomenology. It is found that a satisfactory agreement is
achieved between theory and experiment for momentum transfers up to $Q^2\sim$ 4
GeV$^2$, relying on three-quark configurations only. Analogous studies have
been extended to the $\Delta$ and the hyperon electromagnetic form factors. For
them we here show only some sample results in comparison to data from lattice
quantum chromodynamics.
| [
{
"created": "Wed, 25 Jan 2017 14:42:34 GMT",
"version": "v1"
}
] | 2017-03-08 | [
[
"Rohrmoser",
"Martin",
""
],
[
"Choi",
"Ki-Seok",
""
],
[
"Plessas",
"Willibald",
""
]
] | By the analysis of the world data base of elastic electron scattering on the proton and the neutron (for the latter, in fact, on $^2H$ and $^3He$) important experimental insights have recently been gained into the flavor compositions of nucleon electromagnetic form factors. We report on testing the Graz Goldstone-boson-exchange relativistic constituent-quark model in comparison to the flavor contents in low-energy nucleons, as revealed from electron-scattering phenomenology. It is found that a satisfactory agreement is achieved between theory and experiment for momentum transfers up to $Q^2\sim$ 4 GeV$^2$, relying on three-quark configurations only. Analogous studies have been extended to the $\Delta$ and the hyperon electromagnetic form factors. For them we here show only some sample results in comparison to data from lattice quantum chromodynamics. |
2405.06226 | Gabriele Montefalcone | Kimberly K. Boddy, Katherine Freese, Gabriele Montefalcone, Barmak
Shams Es Haghi | Minimal Dark Matter Freeze-in with Low Reheating Temperatures and
Implications for Direct Detection | 5 pages, 3 figures | null | null | UTWI-16-2024, NORDITA-2024-016 | hep-ph astro-ph.CO hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the influence of the reheating temperature of the visible
sector on the freeze-in dark matter (DM) benchmark model for direct detection
experiments, where DM production is mediated by an ultralight dark photon. Here
we consider a new regime for this benchmark: we take the initial temperature of
the thermal Standard Model (SM) bath to be below the DM mass. The production
rate from the SM bath is drastically reduced due to Boltzmann suppression,
necessitating a significant increase in the portal coupling between DM and the
SM to match the observed relic DM abundance. This enhancement in coupling
strength increases the predicted DM-electron scattering cross section, making
freeze-in DM more accessible to current direct detection experiments.
| [
{
"created": "Fri, 10 May 2024 03:38:58 GMT",
"version": "v1"
}
] | 2024-05-21 | [
[
"Boddy",
"Kimberly K.",
""
],
[
"Freese",
"Katherine",
""
],
[
"Montefalcone",
"Gabriele",
""
],
[
"Haghi",
"Barmak Shams Es",
""
]
] | We investigate the influence of the reheating temperature of the visible sector on the freeze-in dark matter (DM) benchmark model for direct detection experiments, where DM production is mediated by an ultralight dark photon. Here we consider a new regime for this benchmark: we take the initial temperature of the thermal Standard Model (SM) bath to be below the DM mass. The production rate from the SM bath is drastically reduced due to Boltzmann suppression, necessitating a significant increase in the portal coupling between DM and the SM to match the observed relic DM abundance. This enhancement in coupling strength increases the predicted DM-electron scattering cross section, making freeze-in DM more accessible to current direct detection experiments. |
1011.0965 | Rudolph C. Hwa | Rudolph C. Hwa and C. B. Yang | Ridge Formation Induced by Jets in $pp$ Collisions at 7 TeV | Expanded version to be published in Phys. Rev. C | Phys.Rev.C83:024911,2011 | 10.1103/PhysRevC.83.024911 | null | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An interpretation of the ridge phenomenon found in pp collisions at 7 TeV is
given in terms of enhancement of soft partons due to energy loss of semihard
jets. A description of ridge formation in nuclear collisions can directly be
extended to pp collisions, since hydrodynamics is not used, and azimuthal
anisotropy is generated by semihard scattering. Both the p_T and multiplicity
dependencies are well reproduced. Some suggestions are made about other
observables.
| [
{
"created": "Wed, 3 Nov 2010 18:47:10 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Feb 2011 20:01:16 GMT",
"version": "v2"
}
] | 2011-03-02 | [
[
"Hwa",
"Rudolph C.",
""
],
[
"Yang",
"C. B.",
""
]
] | An interpretation of the ridge phenomenon found in pp collisions at 7 TeV is given in terms of enhancement of soft partons due to energy loss of semihard jets. A description of ridge formation in nuclear collisions can directly be extended to pp collisions, since hydrodynamics is not used, and azimuthal anisotropy is generated by semihard scattering. Both the p_T and multiplicity dependencies are well reproduced. Some suggestions are made about other observables. |
1205.6182 | Davide Pagani | Davide Pagani | Top quark forward-backward asymmetry at the Tevatron: the electroweak
contribution | 8 pages, 4 figures. Talk given at Corfu Summer Institute 2011 School
and Workshops on Elementary Particle Physics and Gravity, September 4-18,
2011, Corfu, Greece | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent CDF and D0 measurements of the top quark forward-backward asymmetry at
the Tevatron present deviations between 1-sigma and 2-sigma from QCD
predictions and a cut M_inv > 450 GeV on the events increases this deviation to
3.4 sigma in the CDF measurement. The inclusion of electroweak contributions of
order alpha^2 and order alpha alphas^2 enlarges the theoretical prediction from
QCD by a factor ~ 1.2 and diminishes the observed deviations. The calculation
method is shortly discussed and numerical results are compared to the
experimental data.
| [
{
"created": "Mon, 28 May 2012 18:38:39 GMT",
"version": "v1"
}
] | 2012-05-29 | [
[
"Pagani",
"Davide",
""
]
] | Recent CDF and D0 measurements of the top quark forward-backward asymmetry at the Tevatron present deviations between 1-sigma and 2-sigma from QCD predictions and a cut M_inv > 450 GeV on the events increases this deviation to 3.4 sigma in the CDF measurement. The inclusion of electroweak contributions of order alpha^2 and order alpha alphas^2 enlarges the theoretical prediction from QCD by a factor ~ 1.2 and diminishes the observed deviations. The calculation method is shortly discussed and numerical results are compared to the experimental data. |
hep-ph/0601039 | Yehonathan Segev | Yehonathan Segev and Yael Shadmi | The flavor of product-group GUTs | 10 pages | Phys.Rev. D73 (2006) 115008 | 10.1103/PhysRevD.73.115008 | null | hep-ph | null | The doublet-triplet splitting problem can be simply solved in product-group
GUT models, using a global symmetry that distinguishes the doublets from the
triplets. Apart from giving the required mass hierarchy, this ``triplet
symmetry'' can also forbid some of the triplet couplings to matter. We point
out that, since this symmetry is typically generation-dependent, it gives rise
to non-trivial flavor structure. Furthermore, because flavor symmetries cannot
be exact, the triplet-matter couplings are not forbidden then but only
suppressed. We construct models in which the triplet symmetry gives acceptable
proton decay rate and fermion masses. In some of the models, the prediction m_b
~ m_\tau is retained, while the similar relation for the first generation is
corrected. Finally, all this can be accomplished with triplets somewhat below
the GUT scale, supplying the right correction for the standard model gauge
couplings to unify precisely.
| [
{
"created": "Fri, 6 Jan 2006 07:00:05 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Segev",
"Yehonathan",
""
],
[
"Shadmi",
"Yael",
""
]
] | The doublet-triplet splitting problem can be simply solved in product-group GUT models, using a global symmetry that distinguishes the doublets from the triplets. Apart from giving the required mass hierarchy, this ``triplet symmetry'' can also forbid some of the triplet couplings to matter. We point out that, since this symmetry is typically generation-dependent, it gives rise to non-trivial flavor structure. Furthermore, because flavor symmetries cannot be exact, the triplet-matter couplings are not forbidden then but only suppressed. We construct models in which the triplet symmetry gives acceptable proton decay rate and fermion masses. In some of the models, the prediction m_b ~ m_\tau is retained, while the similar relation for the first generation is corrected. Finally, all this can be accomplished with triplets somewhat below the GUT scale, supplying the right correction for the standard model gauge couplings to unify precisely. |
hep-ph/0612360 | Dimiter Stamenov | Elliot Leader, Aleksander V. Sidorov, Dimiter B. Stamenov | Impact of CLAS and COMPASS data on Polarized Parton Densities and Higher
Twist | Version to be published in Phys. Rev. D., minor changes in the text,
2 figures and 2 references added | Phys.Rev.D75:074027,2007 | 10.1103/PhysRevD.75.074027 | null | hep-ph hep-ex | null | We have re-analyzed the world data on inclusive polarized DIS including the
very precise CLAS proton and deuteron data, as well as the latest COMPASS data
on the asymmetry $A_1^d$, and have studied the impact of these data on
polarized parton densities and higher twist effects. We demonstrate that the
low $Q^2$ CLAS data improve essentially our knowledge of higher twist
corrections to the spin structure function $g_1$, while the large $Q^2$ COMPASS
data influence mainly the strange quark density. In our new analysis we find
that a negative polarized gluon density, or one that changes sign as a function
of x, cannot be ruled out from the present DIS data.
| [
{
"created": "Thu, 28 Dec 2006 18:50:22 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Apr 2007 06:40:03 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Leader",
"Elliot",
""
],
[
"Sidorov",
"Aleksander V.",
""
],
[
"Stamenov",
"Dimiter B.",
""
]
] | We have re-analyzed the world data on inclusive polarized DIS including the very precise CLAS proton and deuteron data, as well as the latest COMPASS data on the asymmetry $A_1^d$, and have studied the impact of these data on polarized parton densities and higher twist effects. We demonstrate that the low $Q^2$ CLAS data improve essentially our knowledge of higher twist corrections to the spin structure function $g_1$, while the large $Q^2$ COMPASS data influence mainly the strange quark density. In our new analysis we find that a negative polarized gluon density, or one that changes sign as a function of x, cannot be ruled out from the present DIS data. |
hep-ph/0512166 | M\'arcio Jos\'e Menon | R.F. Avila and M. J. Menon | Derivative dispersion relations above the physical threshold | Final version, published in Brazilian Journal of Physics, V. 37, 358
(2007) | Braz.J.Phys.37:358-367,2007 | 10.1590/S0103-97332007000300006 | null | hep-ph hep-ex hep-th | null | We discuss some formal and practical aspects related to the replacement of
Integral Dispersion Relations (IDR) by derivative forms, without high-energy
approximations. We first demonstrate that, for a class of functions with
physical interest as forward scattering amplitudes, this replacement can be
analytically performed, leading to novel Extended Derivative Dispersion
Relations (EDDR), which, in principle, are valid for any energy above the
physical threshold. We then verify the equivalence between the IDR and EDDR by
means of a popular parametrization for total cross sections from proton-proton
and antiproton-proton scattering and compare the results with those obtained
through other representations for the derivative relations. Critical aspects on
the limitations of the whole analysis, from both formal and practical points of
view, are also discussed in some detail.
| [
{
"created": "Tue, 13 Dec 2005 19:30:26 GMT",
"version": "v1"
},
{
"created": "Fri, 1 Sep 2006 18:34:12 GMT",
"version": "v2"
},
{
"created": "Tue, 12 Jun 2007 17:26:34 GMT",
"version": "v3"
}
] | 2011-08-04 | [
[
"Avila",
"R. F.",
""
],
[
"Menon",
"M. J.",
""
]
] | We discuss some formal and practical aspects related to the replacement of Integral Dispersion Relations (IDR) by derivative forms, without high-energy approximations. We first demonstrate that, for a class of functions with physical interest as forward scattering amplitudes, this replacement can be analytically performed, leading to novel Extended Derivative Dispersion Relations (EDDR), which, in principle, are valid for any energy above the physical threshold. We then verify the equivalence between the IDR and EDDR by means of a popular parametrization for total cross sections from proton-proton and antiproton-proton scattering and compare the results with those obtained through other representations for the derivative relations. Critical aspects on the limitations of the whole analysis, from both formal and practical points of view, are also discussed in some detail. |
1803.08099 | Adolfo Guevara | A. Guevara, P. Roig and J. J. Sanz-Cillero | Pseudoscalar pole light-by-light contributions to the muon $(g-2)$ in
Resonance Chiral Theory | 43 pages, 5 figures. Accepted for publication in JHEP. New subsection
involving error analysis and some minor changes | null | 10.1007/JHEP06(2018)160 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have studied the $P\to\gamma^\star\gamma^\star$ transition form-factors
($P=\pi^0,\eta,\eta'$) within a chiral invariant framework that allows us to
relate the three form-factors and evaluate the corresponding contributions to
the muon anomalous magnetic moment $a_\mu$, through pseudoscalar pole
contributions. We use a chiral invariant Lagrangian to describe the
interactions between the pseudo-Goldstones from the spontaneous chiral symmetry
breaking and the massive meson resonances. We will consider just the lightest
vector and pseudoscalar resonance multiplets. Photon interactions and flavor
breaking effects are accounted for in this covariant framework. This article
studies the most general corrections of order $m_P^2$ within this setting.
Requiring short-distance constraints fixes most of the parameters entering the
form-factors, consistent with previous determinations. The remaining ones are
obtained from a fit of these form-factors to experimental measurements in the
space-like ($q^2\le0$) region of photon momenta. The combination of data,
chiral symmetry relations between form-factors and high-energy constraints
allows us to determine with improved precision the on-shell $P$-pole
contribution to the Hadronic Light-by-Light scattering of the muon anomalous
magnetic moment: we obtain $a_{\mu}^{P,HLbL}=(8.47\pm 0.16)\cdot10^{-10}$ for
our best fit. This result was obtained excluding BaBar $\pi^0$ data, which our
analysis finds in conflict with the remaining experimental inputs. This study
also allows us to determine the parameters describing the $\eta-\eta'$ system
in the two-mixing angle scheme and their correlations. Finally, a preliminary
rough estimate of the impact of loop corrections ($1/N_C$) and higher vector
multiplets (asym) enlarges the uncertainty up to $a_\mu^{P,HLbL} = (8.47\pm
0.16_{\rm sta}\pm0.09_{1/N_C}{}^{+0.5}_{-0.0}{}_{\rm asym})\cdot 10^{-10}$.
| [
{
"created": "Wed, 21 Mar 2018 19:37:04 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Jun 2018 23:00:05 GMT",
"version": "v2"
}
] | 2018-08-01 | [
[
"Guevara",
"A.",
""
],
[
"Roig",
"P.",
""
],
[
"Sanz-Cillero",
"J. J.",
""
]
] | We have studied the $P\to\gamma^\star\gamma^\star$ transition form-factors ($P=\pi^0,\eta,\eta'$) within a chiral invariant framework that allows us to relate the three form-factors and evaluate the corresponding contributions to the muon anomalous magnetic moment $a_\mu$, through pseudoscalar pole contributions. We use a chiral invariant Lagrangian to describe the interactions between the pseudo-Goldstones from the spontaneous chiral symmetry breaking and the massive meson resonances. We will consider just the lightest vector and pseudoscalar resonance multiplets. Photon interactions and flavor breaking effects are accounted for in this covariant framework. This article studies the most general corrections of order $m_P^2$ within this setting. Requiring short-distance constraints fixes most of the parameters entering the form-factors, consistent with previous determinations. The remaining ones are obtained from a fit of these form-factors to experimental measurements in the space-like ($q^2\le0$) region of photon momenta. The combination of data, chiral symmetry relations between form-factors and high-energy constraints allows us to determine with improved precision the on-shell $P$-pole contribution to the Hadronic Light-by-Light scattering of the muon anomalous magnetic moment: we obtain $a_{\mu}^{P,HLbL}=(8.47\pm 0.16)\cdot10^{-10}$ for our best fit. This result was obtained excluding BaBar $\pi^0$ data, which our analysis finds in conflict with the remaining experimental inputs. This study also allows us to determine the parameters describing the $\eta-\eta'$ system in the two-mixing angle scheme and their correlations. Finally, a preliminary rough estimate of the impact of loop corrections ($1/N_C$) and higher vector multiplets (asym) enlarges the uncertainty up to $a_\mu^{P,HLbL} = (8.47\pm 0.16_{\rm sta}\pm0.09_{1/N_C}{}^{+0.5}_{-0.0}{}_{\rm asym})\cdot 10^{-10}$. |
hep-ph/9208202 | Marc Kamionkowski | Marc Kamionkowski and Katherine Freese | Instability and Subsequent Evolution of Electroweak Bubbles | 9 pages (IASSNS-HEP-92-46) | Phys.Rev.Lett. 69 (1992) 2743-2746 | 10.1103/PhysRevLett.69.2743 | null | hep-ph astro-ph | null | Bubbles in a first-order electroweak phase transition are nucleated with
radii $R_0$ and expand with velocity $v$. If $v$ is subsonic, a bubble becomes
unstable to non-spherical perturbations when its radius is roughly $10^4\,
R_0$. These perturbations accelerate the transition, and the effective velocity
of bubble growth rapidly becomes supersonic. The transition should subsequently
proceed spherically via detonation. If for some reason the onset of detonation
is postponed, the surface area of the bubbles may be enhanced by $10^5$. We
discuss consequences for electroweak baryogenesis.
| [
{
"created": "Tue, 4 Aug 1992 07:21:43 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Kamionkowski",
"Marc",
""
],
[
"Freese",
"Katherine",
""
]
] | Bubbles in a first-order electroweak phase transition are nucleated with radii $R_0$ and expand with velocity $v$. If $v$ is subsonic, a bubble becomes unstable to non-spherical perturbations when its radius is roughly $10^4\, R_0$. These perturbations accelerate the transition, and the effective velocity of bubble growth rapidly becomes supersonic. The transition should subsequently proceed spherically via detonation. If for some reason the onset of detonation is postponed, the surface area of the bubbles may be enhanced by $10^5$. We discuss consequences for electroweak baryogenesis. |
1211.4749 | Elena G. Ferreiro | E.G. Ferreiro, F. Fleuret, J.P. Lansberg and A. Rakotozafindrabe | J/\psi\ and \psi' production in proton(deuteron)-nucleus collisions:
lessons from RHIC for the proton-lead LHC run | 4 pages, 2 tables, 2 figures, contribution to Rencontres du Vietnam,
'Heavy Ion Collisions in the LHC Era', 15-21 July 2012, Quy Nhon, Vietnam | null | 10.1088/1742-6596/422/1/012018 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the impact of different cold nuclear matter effects both on J/\psi\
and \psi' production, among them the modification of the gluon distribution in
bound nucleons, commonly known as gluon shadowing, and the survival probability
for a bound state to escape the nucleus --the nuclear absorption. Less
conventional effects such as saturation and fractional energy loss are also
discussed. We pay a particular attention to the recent PHENIX preliminary data
on \psi' production in dAu collisions at sqrt{s}=200 GeV, which show a strong
suppression for central collisions, 5 times larger than the one obtained for
J/\psi\ production at the same energy. We conclude that none of the
abovementioned mechanisms can explain this experimental result.
| [
{
"created": "Tue, 20 Nov 2012 14:00:17 GMT",
"version": "v1"
}
] | 2015-06-12 | [
[
"Ferreiro",
"E. G.",
""
],
[
"Fleuret",
"F.",
""
],
[
"Lansberg",
"J. P.",
""
],
[
"Rakotozafindrabe",
"A.",
""
]
] | We study the impact of different cold nuclear matter effects both on J/\psi\ and \psi' production, among them the modification of the gluon distribution in bound nucleons, commonly known as gluon shadowing, and the survival probability for a bound state to escape the nucleus --the nuclear absorption. Less conventional effects such as saturation and fractional energy loss are also discussed. We pay a particular attention to the recent PHENIX preliminary data on \psi' production in dAu collisions at sqrt{s}=200 GeV, which show a strong suppression for central collisions, 5 times larger than the one obtained for J/\psi\ production at the same energy. We conclude that none of the abovementioned mechanisms can explain this experimental result. |
1206.3979 | Pedro Jimenez-Delgado | Pedro Jimenez-Delgado | Progress in the dynamical parton distributions | 4 pages, 1 figure, Talk given at the XX International Workshop on
Deep-Inelastic Scattering and Related Subjects (DIS2012) | null | null | JLAB-THY-12-1576 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The present status of the (JR) dynamical parton distribution functions is
reported. Different theoretical improvements, including the determination of
the strange sea input distribution, the treatment of correlated errors and the
inclusion of alternative data sets, are discussed. Highlights in the ongoing
developments as well as (very) preliminary results in the determination of the
strong coupling constant are presented.
| [
{
"created": "Mon, 18 Jun 2012 16:19:39 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Jun 2012 20:09:29 GMT",
"version": "v2"
}
] | 2012-06-22 | [
[
"Jimenez-Delgado",
"Pedro",
""
]
] | The present status of the (JR) dynamical parton distribution functions is reported. Different theoretical improvements, including the determination of the strange sea input distribution, the treatment of correlated errors and the inclusion of alternative data sets, are discussed. Highlights in the ongoing developments as well as (very) preliminary results in the determination of the strong coupling constant are presented. |
hep-ph/0509093 | Cai-Dian Lu | Jun-Xiao Chen, Zhao-Yu Hou, Ying Li and Cai-Dian Lu | Branching ratio of rare decay $B^0(B_s)\to \gamma \nu \bar{\nu}$ | Latex, 9 pages, including 4 figures | null | null | null | hep-ph | null | The three-body decay $B^0(B_s)\to \gamma\nu \bar{\nu}$ can occur via penguin
and box diagrams in the standard model (SM). These channels are useful to
determine the decay constants $f_B$ ($f_{B_s}$) and $B$ ($B_s$) meson wave
function. Using the B meson wave function determined in hadronic $B (B_s)$
decays, we calculate and get the branching ratio of order $10^{-9}$ and
$10^{-8}$ for $B^0$ and $B_s$ decay, respectively. They agree with previous
calculations.
| [
{
"created": "Sat, 10 Sep 2005 03:57:36 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Chen",
"Jun-Xiao",
""
],
[
"Hou",
"Zhao-Yu",
""
],
[
"Li",
"Ying",
""
],
[
"Lu",
"Cai-Dian",
""
]
] | The three-body decay $B^0(B_s)\to \gamma\nu \bar{\nu}$ can occur via penguin and box diagrams in the standard model (SM). These channels are useful to determine the decay constants $f_B$ ($f_{B_s}$) and $B$ ($B_s$) meson wave function. Using the B meson wave function determined in hadronic $B (B_s)$ decays, we calculate and get the branching ratio of order $10^{-9}$ and $10^{-8}$ for $B^0$ and $B_s$ decay, respectively. They agree with previous calculations. |
2407.09255 | Neelam Singh | Gauhar Abbas, Ashutosh Kumar Alok, Neetu Raj Singh Chundawat,
Najimuddin Khan, Neelam Singh | Finding flavon | 63 pages, 31 figures | null | null | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | We conduct a comprehensive investigation into the flavour phenomenology and
collider signatures of flavon of $\mathcal{Z}_{\rm N} \times \mathcal{Z}_{\rm
M}$ flavour symmetries for the soft symmetry-breaking scenario and a new
symmetry-conserving mechanism at the high-luminosity LHC, high energy LHC, and
a 100 TeV hadron collider. The flavour physics of quark and leptonic
observables places different bounds on the parameter space of flavons of
$\mathcal{Z}_{\rm N} \times \mathcal{Z}_{\rm M}$ flavour symmetries. On the
collider side, the decay $t \rightarrow c a$ can be probed by the
high-luminosity LHC, high energy LHC, and a 100 TeV hadron collider for the
$\mathcal{Z}_{\rm 8} \times \mathcal{Z}_{\rm 22}$ flavour symmetry. The
inclusive production signatures can be used to probe the flavon of all the
$\mathcal{Z}_{\rm N} \times \mathcal{Z}_{\rm M} $ flavour symmetries for the
soft symmetry-breaking scenario for a heavy flavon at a 100 TeV collider.
Flavons of all the $\mathcal{Z}_{\rm N} \times \mathcal{Z}_{\rm M} $ flavour
symmetries can be probed at high energy LHC and a 100 TeV collider for a low
mass in the case of soft symmetry-breaking. The di-flavon production is within
reach of the high-luminosity LHC, high energy LHC, and a 100 TeV collider only
for a light flavon. The 14 TeV high-luminosity LHC can probe only the
$\mathcal{Z}_{\rm 2} \times \mathcal{Z}_{\rm 5}$ and $\mathcal{Z}_{\rm 8}
\times \mathcal{Z}_{\rm 22}$ flavour symmetries for a few specific inclusive
signatures. The symmetry-conserving scenario remains beyond the detection
capabilities of any collider.
| [
{
"created": "Fri, 12 Jul 2024 13:33:37 GMT",
"version": "v1"
}
] | 2024-07-15 | [
[
"Abbas",
"Gauhar",
""
],
[
"Alok",
"Ashutosh Kumar",
""
],
[
"Chundawat",
"Neetu Raj Singh",
""
],
[
"Khan",
"Najimuddin",
""
],
[
"Singh",
"Neelam",
""
]
] | We conduct a comprehensive investigation into the flavour phenomenology and collider signatures of flavon of $\mathcal{Z}_{\rm N} \times \mathcal{Z}_{\rm M}$ flavour symmetries for the soft symmetry-breaking scenario and a new symmetry-conserving mechanism at the high-luminosity LHC, high energy LHC, and a 100 TeV hadron collider. The flavour physics of quark and leptonic observables places different bounds on the parameter space of flavons of $\mathcal{Z}_{\rm N} \times \mathcal{Z}_{\rm M}$ flavour symmetries. On the collider side, the decay $t \rightarrow c a$ can be probed by the high-luminosity LHC, high energy LHC, and a 100 TeV hadron collider for the $\mathcal{Z}_{\rm 8} \times \mathcal{Z}_{\rm 22}$ flavour symmetry. The inclusive production signatures can be used to probe the flavon of all the $\mathcal{Z}_{\rm N} \times \mathcal{Z}_{\rm M} $ flavour symmetries for the soft symmetry-breaking scenario for a heavy flavon at a 100 TeV collider. Flavons of all the $\mathcal{Z}_{\rm N} \times \mathcal{Z}_{\rm M} $ flavour symmetries can be probed at high energy LHC and a 100 TeV collider for a low mass in the case of soft symmetry-breaking. The di-flavon production is within reach of the high-luminosity LHC, high energy LHC, and a 100 TeV collider only for a light flavon. The 14 TeV high-luminosity LHC can probe only the $\mathcal{Z}_{\rm 2} \times \mathcal{Z}_{\rm 5}$ and $\mathcal{Z}_{\rm 8} \times \mathcal{Z}_{\rm 22}$ flavour symmetries for a few specific inclusive signatures. The symmetry-conserving scenario remains beyond the detection capabilities of any collider. |
1405.5640 | S. Weinzierl | Luise Adams, Christian Bogner and Stefan Weinzierl | The two-loop sunrise graph in two space-time dimensions with arbitrary
masses in terms of elliptic dilogarithms | 22 pages, version to be published | null | 10.1063/1.4896563 | null | hep-ph hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the two-loop sunrise integral with arbitrary non-zero masses in
two space-time dimensions in terms of elliptic dilogarithms. We find that the
structure of the result is as simple and elegant as in the equal mass case,
only the arguments of the elliptic dilogarithms are modified. These arguments
have a nice geometric interpretation.
| [
{
"created": "Thu, 22 May 2014 07:19:51 GMT",
"version": "v1"
},
{
"created": "Sun, 14 Sep 2014 10:02:20 GMT",
"version": "v2"
}
] | 2015-06-19 | [
[
"Adams",
"Luise",
""
],
[
"Bogner",
"Christian",
""
],
[
"Weinzierl",
"Stefan",
""
]
] | We present the two-loop sunrise integral with arbitrary non-zero masses in two space-time dimensions in terms of elliptic dilogarithms. We find that the structure of the result is as simple and elegant as in the equal mass case, only the arguments of the elliptic dilogarithms are modified. These arguments have a nice geometric interpretation. |
hep-ph/0605264 | Apostolos Pilaftsis | Bjorn Garbrecht, Constantinos Pallis and Apostolos Pilaftsis | Anatomy of F_D-Term Hybrid Inflation | 73 pages, LaTeX, minor rewordings, references added, to appear in
JHEP | JHEP0612:038,2006 | 10.1088/1126-6708/2006/12/038 | CERN-PH-TH/2006-100,MAN/HEP/2006/17 | hep-ph astro-ph | null | We analyze the cosmological implications of F-term hybrid inflation with a
subdominant Fayet--Iliopoulos D-term whose presence explicitly breaks a
D-parity in the inflaton-waterfall sector. This scenario of inflation, which is
called F_D-term hybrid model for brevity, can naturally predict lepton number
violation at the electroweak scale, by tying the mu-parameter of the MSSM to an
SO(3)-symmetric Majorana mass m_N, via the vacuum expectation value of the
inflaton field. We show how a negative Hubble-induced mass term in a
next-to-minimal extension of supergravity helps to accommodate the present CMB
data and considerably weaken the strict constraints on the theoretical
parameters, resulting from cosmic string effects on the power spectrum P_R. The
usual gravitino overabundance constraint may be significantly relaxed in this
model, once the enormous entropy release from the late decays of the ultraheavy
waterfall gauge particles is properly considered. As the Universe enters a
second thermalization phase involving a very low reheat temperature, which
might be as low as about 0.3 TeV, thermal electroweak-scale resonant
leptogenesis provides a viable mechanism for successful baryogenesis, while
thermal right-handed sneutrinos emerge as new possible candidates for solving
the cold dark matter problem. In addition, we discuss grand unified theory
realizations of F_D-term hybrid inflation devoid of cosmic strings and
monopoles, based on the complete breaking of an SU(2) subgroup. The F_D-term
hybrid model offers rich particle-physics phenomenology, which could be probed
at high-energy colliders, as well as in low-energy experiments of lepton
flavour or number violation.
| [
{
"created": "Wed, 24 May 2006 15:57:59 GMT",
"version": "v1"
},
{
"created": "Sat, 3 Jun 2006 14:20:37 GMT",
"version": "v2"
},
{
"created": "Tue, 14 Nov 2006 17:05:26 GMT",
"version": "v3"
}
] | 2009-11-11 | [
[
"Garbrecht",
"Bjorn",
""
],
[
"Pallis",
"Constantinos",
""
],
[
"Pilaftsis",
"Apostolos",
""
]
] | We analyze the cosmological implications of F-term hybrid inflation with a subdominant Fayet--Iliopoulos D-term whose presence explicitly breaks a D-parity in the inflaton-waterfall sector. This scenario of inflation, which is called F_D-term hybrid model for brevity, can naturally predict lepton number violation at the electroweak scale, by tying the mu-parameter of the MSSM to an SO(3)-symmetric Majorana mass m_N, via the vacuum expectation value of the inflaton field. We show how a negative Hubble-induced mass term in a next-to-minimal extension of supergravity helps to accommodate the present CMB data and considerably weaken the strict constraints on the theoretical parameters, resulting from cosmic string effects on the power spectrum P_R. The usual gravitino overabundance constraint may be significantly relaxed in this model, once the enormous entropy release from the late decays of the ultraheavy waterfall gauge particles is properly considered. As the Universe enters a second thermalization phase involving a very low reheat temperature, which might be as low as about 0.3 TeV, thermal electroweak-scale resonant leptogenesis provides a viable mechanism for successful baryogenesis, while thermal right-handed sneutrinos emerge as new possible candidates for solving the cold dark matter problem. In addition, we discuss grand unified theory realizations of F_D-term hybrid inflation devoid of cosmic strings and monopoles, based on the complete breaking of an SU(2) subgroup. The F_D-term hybrid model offers rich particle-physics phenomenology, which could be probed at high-energy colliders, as well as in low-energy experiments of lepton flavour or number violation. |
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