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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
hep-ph/9308211 | null | Edi Halyo | Can the Axions of Standard--like Superstring Models Solve the Strong CP
Problem? | WIS-93/66/JUL-PH, 13 pages in Phyzzx.Tex and 1 table in Tables.Tex.
(Axion mixing is taken into account and the point about the global symmetry
is clarified.) | Phys.Lett. B318 (1993) 597-603 | 10.1016/0370-2693(93)90460-Y | null | hep-ph | null | We find that there are three axions in standard--like superstring models in
the four dimensional free fermionic formulation. These axions are either
harmful or very heavy. Therefore, they cannot solve the strong CP problem. We
show that this is a general result in superstring models with chiral
generations from the $Z_2$ twisted sectors which use a $Z_4$ twist.
| [
{
"created": "Tue, 3 Aug 1993 13:32:45 GMT",
"version": "v1"
},
{
"created": "Sun, 12 Sep 1993 14:29:13 GMT",
"version": "v2"
}
] | 2009-10-22 | [
[
"Halyo",
"Edi",
""
]
] | We find that there are three axions in standard--like superstring models in the four dimensional free fermionic formulation. These axions are either harmful or very heavy. Therefore, they cannot solve the strong CP problem. We show that this is a general result in superstring models with chiral generations from the $Z_2$ twisted sectors which use a $Z_4$ twist. |
hep-ph/0702233 | Tatsuru Kikuchi | Takeshi Fukuyama, Tatsuru Kikuchi and Nobuchika Okada | The current problems of the minimal SO(10) GUT and their solutions | 15 pages, 7 figures, Talk given at the International Workshop on
Neutrino Masses and Mixings Toward Unified Understanding of Quarks and Lepton
Mass Matrices, held at University of Shizuoka on December 17-19, 2006 | Int.J.Mod.Phys.E16:1489-1503,2007 | 10.1142/S0218301307006836 | null | hep-ph | null | This talk consists of two parts. In part I we review how the minimal
renormalizable supersymmetric SO(10) model, an SO(10) framework with only one
10 and one 126 Higgs multiplets in the Yukawa sector, is attractive because of
its highly predictive power. Indeed it not only gives a consistent predictions
on neutrino oscillation data but also gives reasonable and interesting values
for leptogenesis, LFV, muon g-2, neutrinoless double beta decay etc. However,
this model suffers from problems related to running of gauge couplings. The
gauge coupling unification may be spoiled due to the presence of Higgs
multiplets much lighter than the grand unification (GUT) scale. In addition,
the gauge couplings blow up around the GUT scale because of the presence of
Higgs multiplets of large representations. In part II we consider the minimal
SO(10) model in the warped extra dimension and show a possibility to solve
these problems.
| [
{
"created": "Thu, 22 Feb 2007 14:26:05 GMT",
"version": "v1"
}
] | 2010-11-24 | [
[
"Fukuyama",
"Takeshi",
""
],
[
"Kikuchi",
"Tatsuru",
""
],
[
"Okada",
"Nobuchika",
""
]
] | This talk consists of two parts. In part I we review how the minimal renormalizable supersymmetric SO(10) model, an SO(10) framework with only one 10 and one 126 Higgs multiplets in the Yukawa sector, is attractive because of its highly predictive power. Indeed it not only gives a consistent predictions on neutrino oscillation data but also gives reasonable and interesting values for leptogenesis, LFV, muon g-2, neutrinoless double beta decay etc. However, this model suffers from problems related to running of gauge couplings. The gauge coupling unification may be spoiled due to the presence of Higgs multiplets much lighter than the grand unification (GUT) scale. In addition, the gauge couplings blow up around the GUT scale because of the presence of Higgs multiplets of large representations. In part II we consider the minimal SO(10) model in the warped extra dimension and show a possibility to solve these problems. |
hep-ph/0310149 | Daniele Binosi | D. Binosi and J. Papavassiliou | BRST-driven cancellations and gauge invariant Green's functions | 4 pages, 3 figures. Contributed to QCD 03: High-Energy Physics
International Conference in Quantum Chromodynamics, Montpellier, France, 2-9
July 2003 | null | 10.1016/j.nuclphysbps.2004.04.179 | FTUV-03-1013 | hep-ph | null | We study a fundamental, all order cancellation operating between graphs of
distinct kinematic nature, which allows for the construction of
gauge-independent effective self-energies, vertices, and boxes at arbitrary
order.
| [
{
"created": "Mon, 13 Oct 2003 16:26:19 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Binosi",
"D.",
""
],
[
"Papavassiliou",
"J.",
""
]
] | We study a fundamental, all order cancellation operating between graphs of distinct kinematic nature, which allows for the construction of gauge-independent effective self-energies, vertices, and boxes at arbitrary order. |
1309.7951 | Antonio Figueiredo | A. J. R. Figueiredo, A. M. Teixeira | Slepton mass splittings and cLFV in the SUSY seesaw in the light of
recent experimental results | 19 pages, 12 eps figures. References updated; matches version
accepted by JHEP | JHEP 1401 (2014) 015 | 10.1007/JHEP01(2014)015 | CFTP-13-022, PCCF-RI-13-06 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Following recent experimental developments, in this study we re-evaluate if
the interplay of high- and low-energy lepton flavour violating observables
remains a viable probe to test the high-scale type-I supersymmetric seesaw. Our
analysis shows that fully constrained supersymmetric scenarios no longer allow
to explore this interplay, since recent LHC data precludes the possibility of
having sizeable slepton mass differences for a slepton spectrum sufficiently
light to be produced, and in association to BR(mu -> e gamma) within
experimental reach. However, relaxing the strict universality of supersymmetric
soft-breaking terms, and fully exploring heavy neutrino dynamics, still allows
to have slepton mass splittings O(few %), for slepton masses accessible at the
LHC, with associated mu -> e gamma rates within future sensitivity. For these
scenarios, we illustrate how the correlation between high- and low-energy
lepton flavour violating observables allows to probe the high-scale
supersymmetric seesaw.
| [
{
"created": "Mon, 30 Sep 2013 18:33:51 GMT",
"version": "v1"
},
{
"created": "Fri, 3 Jan 2014 17:04:38 GMT",
"version": "v2"
}
] | 2015-03-03 | [
[
"Figueiredo",
"A. J. R.",
""
],
[
"Teixeira",
"A. M.",
""
]
] | Following recent experimental developments, in this study we re-evaluate if the interplay of high- and low-energy lepton flavour violating observables remains a viable probe to test the high-scale type-I supersymmetric seesaw. Our analysis shows that fully constrained supersymmetric scenarios no longer allow to explore this interplay, since recent LHC data precludes the possibility of having sizeable slepton mass differences for a slepton spectrum sufficiently light to be produced, and in association to BR(mu -> e gamma) within experimental reach. However, relaxing the strict universality of supersymmetric soft-breaking terms, and fully exploring heavy neutrino dynamics, still allows to have slepton mass splittings O(few %), for slepton masses accessible at the LHC, with associated mu -> e gamma rates within future sensitivity. For these scenarios, we illustrate how the correlation between high- and low-energy lepton flavour violating observables allows to probe the high-scale supersymmetric seesaw. |
hep-ph/9611422 | null | Maxim Pospelov | FCNC in left-right symmetric theories and constraints on the
right-handed scale | 11 pages, latex, 3 figures | Phys. Rev. D 56, 259 (1997) | 10.1103/PhysRevD.56.259 | UQAM-PHE/96-09 | hep-ph | null | We revise the limits on the FCNC higgses in manifestly left-right symmetric
theories. It is shown that the combination of the Kobayashi-Maskawa
CP-violation with the tree level $\Delta S=2$ higgs exchange gives very large
contribution to the CP-violating $\epsilon$ parameter. It leads to the new
strong constraint on the FCNC higgs mass, M>50- 100 TeV, enhanced by factor of
the order $\sqrt{m_t/m_c}$. Being addressed to the supersymmetric left-right
models, FCNC problem requires both right-handed scale and supersymmetric mass
parameters be heavier than 50 TeV for $tan\beta\sim 1$. The most relaxed case
corresponds to $tan\beta\sim 20- 30$ where right-handed scale can be of the
order of few TeV.
| [
{
"created": "Tue, 26 Nov 1996 02:06:57 GMT",
"version": "v1"
}
] | 2016-08-24 | [
[
"Pospelov",
"Maxim",
""
]
] | We revise the limits on the FCNC higgses in manifestly left-right symmetric theories. It is shown that the combination of the Kobayashi-Maskawa CP-violation with the tree level $\Delta S=2$ higgs exchange gives very large contribution to the CP-violating $\epsilon$ parameter. It leads to the new strong constraint on the FCNC higgs mass, M>50- 100 TeV, enhanced by factor of the order $\sqrt{m_t/m_c}$. Being addressed to the supersymmetric left-right models, FCNC problem requires both right-handed scale and supersymmetric mass parameters be heavier than 50 TeV for $tan\beta\sim 1$. The most relaxed case corresponds to $tan\beta\sim 20- 30$ where right-handed scale can be of the order of few TeV. |
hep-ph/0411074 | Farida Iddir | F. Iddir and L. Semlala | Quarks-excited states or gluon-excited states, are the J^{PC}=1^{-+}
hybrid mesons confirmed? | 18 pages | null | null | null | hep-ph | null | The existence of hadrons containing gluons as constituent particles (like
hybrid mesons) will involve the necessity to admit an hadronic spectroscopy
beyond the naive quark model. In the QGC model, the lowest J^{PC}= 1^{-+}
hybrid mesons may be built in two different modes: the GE-mode corresponding to
an angular momentum between the gluon and qqbar system, while the QE-mode
corresponding to an angular momentum between q and qbar. In this paper, we give
an analysis of the possible 1^{-+} hybrid mesons in the 1.32-2.04 GeV mass
range, and predictions on their decay. We discuss on the inconsistency between
some theoretical results and experimental data.We find that the 1^{-+}(1400
MeV), dominated by the QE-mode will decay in the favourite rho-pi channel,
while the GE-1^{-+}(1600 MeV), and the 1^{-+}(2.0 GeV), pure GE-hybrids, will
decay preferably into b1-pi channel (never observed); we indicate problems
concerning the observation of decay channels which are forbidden by theoretical
present models.The total decay widths of the 1^{-+}(2.0 GeV) and the
GE-1^{-+}(1600 MeV) being very large, this leads to a problem of their
observability as resonances. We may conclude that at this time, there is no
absolute confirmation of their existence, but some asked questions remain not
solved.
| [
{
"created": "Thu, 4 Nov 2004 22:19:39 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Iddir",
"F.",
""
],
[
"Semlala",
"L.",
""
]
] | The existence of hadrons containing gluons as constituent particles (like hybrid mesons) will involve the necessity to admit an hadronic spectroscopy beyond the naive quark model. In the QGC model, the lowest J^{PC}= 1^{-+} hybrid mesons may be built in two different modes: the GE-mode corresponding to an angular momentum between the gluon and qqbar system, while the QE-mode corresponding to an angular momentum between q and qbar. In this paper, we give an analysis of the possible 1^{-+} hybrid mesons in the 1.32-2.04 GeV mass range, and predictions on their decay. We discuss on the inconsistency between some theoretical results and experimental data.We find that the 1^{-+}(1400 MeV), dominated by the QE-mode will decay in the favourite rho-pi channel, while the GE-1^{-+}(1600 MeV), and the 1^{-+}(2.0 GeV), pure GE-hybrids, will decay preferably into b1-pi channel (never observed); we indicate problems concerning the observation of decay channels which are forbidden by theoretical present models.The total decay widths of the 1^{-+}(2.0 GeV) and the GE-1^{-+}(1600 MeV) being very large, this leads to a problem of their observability as resonances. We may conclude that at this time, there is no absolute confirmation of their existence, but some asked questions remain not solved. |
hep-ph/9605366 | null | Wu-Sheng Dai, Song Gao and Xue-Qian Li | Study on $\nu_{\mu}$, $\nu_{\tau}$ Decays and CP-Non Invariance at Early
Epoch of the Universe | 14 pages(LaTeX), uuencode, 2 figures(1 PS file) | Commun.Theor.Phys. 29 (1998) 271-276 | null | BIHEP-TH-96-18 | hep-ph | null | We study the $\nu_{\mu}$ and $\nu_{\tau}$ decays in the early epoch of the
universe. If $m_{\nu_{\tau}}>2m_e$, there would be a CP asymmetry between
$\nu_{\tau}\rightarrow e^++e^-+\nu_e$ and $\bar{\nu}_{\tau} \rightarrow
e^++e^-+\bar{\nu}_e$. The resultant CP non-invariance is a function of
temperature and density and can reach $10^{-7}$ for a reasonable temperature
range, but it is noticed that if $m_{\nu_{\tau}}>2m_{\mu}\sim 200$ MeV, the CP
non-invariance can be much larger.
| [
{
"created": "Tue, 21 May 1996 13:10:45 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Dai",
"Wu-Sheng",
""
],
[
"Gao",
"Song",
""
],
[
"Li",
"Xue-Qian",
""
]
] | We study the $\nu_{\mu}$ and $\nu_{\tau}$ decays in the early epoch of the universe. If $m_{\nu_{\tau}}>2m_e$, there would be a CP asymmetry between $\nu_{\tau}\rightarrow e^++e^-+\nu_e$ and $\bar{\nu}_{\tau} \rightarrow e^++e^-+\bar{\nu}_e$. The resultant CP non-invariance is a function of temperature and density and can reach $10^{-7}$ for a reasonable temperature range, but it is noticed that if $m_{\nu_{\tau}}>2m_{\mu}\sim 200$ MeV, the CP non-invariance can be much larger. |
hep-ph/0504095 | Yasunori Nomura | Z. Chacko, Yasunori Nomura, David Tucker-Smith | A Minimally Fine-Tuned Supersymmetric Standard Model | 49 pages, Latex, reference added | Nucl.Phys.B725:207-250,2005 | 10.1016/j.nuclphysb.2005.07.019 | UCB-PTH-05/11, LBNL-57427 | hep-ph | null | We construct supersymmetric theories in which the correct scale for
electroweak symmetry breaking is obtained without significant fine-tuning. We
calculate the fine-tuning parameter for these theories to be at the 20% level,
which is significantly better than in conventional supersymmetry breaking
scenarios. Supersymmetry breaking occurs at a low scale of order 100 TeV, and
is transmitted to the supersymmetric standard-model sector through
standard-model gauge interactions. The Higgs sector contains two Higgs doublets
and a singlet field, with a superpotential that takes the most general form
allowed by gauge invariance. An explicit model is constructed in 5D warped
space with supersymmetry broken on the infrared brane. We perform a detailed
analysis of electroweak symmetry breaking for this model, and demonstrate that
the fine-tuning is in fact reduced. A new candidate for dark matter is also
proposed, which arises from the extended Higgs sector of the model. Finally, we
discuss a purely 4D theory which may also significantly reduce fine-tuning.
| [
{
"created": "Wed, 13 Apr 2005 03:56:02 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Aug 2005 02:36:47 GMT",
"version": "v2"
}
] | 2009-09-29 | [
[
"Chacko",
"Z.",
""
],
[
"Nomura",
"Yasunori",
""
],
[
"Tucker-Smith",
"David",
""
]
] | We construct supersymmetric theories in which the correct scale for electroweak symmetry breaking is obtained without significant fine-tuning. We calculate the fine-tuning parameter for these theories to be at the 20% level, which is significantly better than in conventional supersymmetry breaking scenarios. Supersymmetry breaking occurs at a low scale of order 100 TeV, and is transmitted to the supersymmetric standard-model sector through standard-model gauge interactions. The Higgs sector contains two Higgs doublets and a singlet field, with a superpotential that takes the most general form allowed by gauge invariance. An explicit model is constructed in 5D warped space with supersymmetry broken on the infrared brane. We perform a detailed analysis of electroweak symmetry breaking for this model, and demonstrate that the fine-tuning is in fact reduced. A new candidate for dark matter is also proposed, which arises from the extended Higgs sector of the model. Finally, we discuss a purely 4D theory which may also significantly reduce fine-tuning. |
hep-ph/9901255 | Alexander Mirolyubov | Yu.Novozhilov, A.Pronko, D.Vassilevich, A.Korotkov | Extended chiral Group and Scalar Diquarks | 18 pages | null | null | Proceedings of the VIII UNESCO International school of physics, Part
I, p. 141-158 | hep-ph | null | We introduce extended chiral transformation, which depends both on
pseudoscalar and diquark fields as parameters and determine its group
structure. Assuming soft symmetry breaking in diquark sector, bosonisation of a
quasi-Goldstone $ud$-diquark is performed. In the chiral limit the $ud$-diquark
mass is defined by the gluon condensate, $m_{ud}\approx 300 MeV$. The diquark
charge radius is $<r^2_{ud}>^{1/2}\approx 0.5 fm$. We consider also the flavour
triplet of scalar diquarks $(ud)$, $(us)$ and $(ds)$ together with pseudoscalar
mesons and calculate diquark masses and decay constants in terms of meson
parameters and the gluon condensate.
| [
{
"created": "Fri, 8 Jan 1999 19:00:50 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Novozhilov",
"Yu.",
""
],
[
"Pronko",
"A.",
""
],
[
"Vassilevich",
"D.",
""
],
[
"Korotkov",
"A.",
""
]
] | We introduce extended chiral transformation, which depends both on pseudoscalar and diquark fields as parameters and determine its group structure. Assuming soft symmetry breaking in diquark sector, bosonisation of a quasi-Goldstone $ud$-diquark is performed. In the chiral limit the $ud$-diquark mass is defined by the gluon condensate, $m_{ud}\approx 300 MeV$. The diquark charge radius is $<r^2_{ud}>^{1/2}\approx 0.5 fm$. We consider also the flavour triplet of scalar diquarks $(ud)$, $(us)$ and $(ds)$ together with pseudoscalar mesons and calculate diquark masses and decay constants in terms of meson parameters and the gluon condensate. |
1807.11839 | Gudrun Heinrich | Gerhard Buchalla, Alejandro Celis, Matteo Capozi, Gudrun Heinrich,
Ludovic Scyboz | Higher order and top mass effects in Higgs boson pair production beyond
the Standard Model | To appear in the proceedings of the conference "Loops and Legs in
Quantum Field Theory", April 29-May 4, 2018, St. Goar, Germany | null | null | MPP-2018-196 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the interplay between NLO QCD corrections and anomalous couplings
in Higgs boson pair production via gluon fusion, within the framework of a
non-linearly realised Effective Field Theory, described by the electroweak
chiral Lagrangian. We study how the NLO corrections with full top quark mass
dependence affect the total cross sections as well as distributions in the
Higgs boson pair invariant mass. For a large part of the parameter space,
significant and non-homogeneous K-factors arise.
| [
{
"created": "Tue, 31 Jul 2018 14:37:01 GMT",
"version": "v1"
}
] | 2018-08-01 | [
[
"Buchalla",
"Gerhard",
""
],
[
"Celis",
"Alejandro",
""
],
[
"Capozi",
"Matteo",
""
],
[
"Heinrich",
"Gudrun",
""
],
[
"Scyboz",
"Ludovic",
""
]
] | We discuss the interplay between NLO QCD corrections and anomalous couplings in Higgs boson pair production via gluon fusion, within the framework of a non-linearly realised Effective Field Theory, described by the electroweak chiral Lagrangian. We study how the NLO corrections with full top quark mass dependence affect the total cross sections as well as distributions in the Higgs boson pair invariant mass. For a large part of the parameter space, significant and non-homogeneous K-factors arise. |
hep-ph/0109160 | Claude Bourrely | C. Bourrely, J. Soffer and F. Buccella | A statistical approach for polarized parton distributions | 49 pages, 27 eps figures | Eur.Phys.J.C23:487-501,2002 | 10.1007/s100520100855 | CPT-2001/P.4205, UNIV. NAPLES DSF 29/2001 | hep-ph | null | A global next-to-leading order QCD analysis of unpolarized and polarized
deep-inelastic scattering data is performed with parton distributions
constructed in a statistical physical picture of the nucleon. The chiral
properties of QCD lead to strong relations between quarks and antiquarks
distributions and the importance of the Pauli exclusion principle is also
emphasized. We obtain a good description, in a broad range of $x$ and $Q^2$, of
all measured structure functions in terms of very few free parameters. We
stress the fact that at RHIC-BNL the ratio of the unpolarized cross sections
for the production of $W^+$ and $W^-$ in $pp$ collisions, will directly probe
the behavior of the $\bar d(x) / \bar u(x)$ ratio for $x \geq 0.2$, a definite
and important test for the statistical model. Finally, we give specific
predictions for various helicity asymmetries for the $W^{\pm}, Z$ production in
$pp$ collisions at high energies, which will be measured with forthcoming
experiments at RHIC-BNL and are sensitive tests of the statistical model for
$\Delta \bar u(x)$ and $\Delta \bar d(x)$.
| [
{
"created": "Tue, 18 Sep 2001 13:43:07 GMT",
"version": "v1"
}
] | 2011-09-13 | [
[
"Bourrely",
"C.",
""
],
[
"Soffer",
"J.",
""
],
[
"Buccella",
"F.",
""
]
] | A global next-to-leading order QCD analysis of unpolarized and polarized deep-inelastic scattering data is performed with parton distributions constructed in a statistical physical picture of the nucleon. The chiral properties of QCD lead to strong relations between quarks and antiquarks distributions and the importance of the Pauli exclusion principle is also emphasized. We obtain a good description, in a broad range of $x$ and $Q^2$, of all measured structure functions in terms of very few free parameters. We stress the fact that at RHIC-BNL the ratio of the unpolarized cross sections for the production of $W^+$ and $W^-$ in $pp$ collisions, will directly probe the behavior of the $\bar d(x) / \bar u(x)$ ratio for $x \geq 0.2$, a definite and important test for the statistical model. Finally, we give specific predictions for various helicity asymmetries for the $W^{\pm}, Z$ production in $pp$ collisions at high energies, which will be measured with forthcoming experiments at RHIC-BNL and are sensitive tests of the statistical model for $\Delta \bar u(x)$ and $\Delta \bar d(x)$. |
1403.4953 | Valentin V. Khoze | Valentin V. Khoze, Christopher McCabe and Gunnar Ro | Higgs vacuum stability from the dark matter portal | 33 pages, 11 figures v2: typos corrected | null | 10.1007/JHEP08(2014)026 | IPPP/14/22, DCPT/14/44 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider classically scale-invariant extensions of the Standard Model (CSI
ESM) which stabilise the Higgs potential and have good dark matter candidates.
In this framework all mass scales, including electroweak and dark matter
masses, are generated dynamically and have a common origin. We consider Abelian
and non-Abelian hidden sectors portally coupled to the SM with and without a
real singlet scalar. We perform a careful analysis of RG running to determine
regions in the parameter space where the SM Higgs vacuum is stabilised. After
combining this with the LHC Higgs constraints, in models without a singlet,
none of the regained parameter space in Abelian ESMs, and only a small section
in the non-Abelian ESM survives. However, in all singlet-extended models we
find that the Higgs vacuum can be stabilised in all of the parameter space
consistent with the LHC constraints. These models naturally contain two dark
matter candidates: the real singlet and the dark gauge boson in non-Abelian
models. We determine the viable range of parameters in the CSI ESM framework by
computing the relic abundance, imposing direct detection constraints and
combining with the LHC Higgs constraints. In addition to being instrumental in
Higgs stabilisation, we find that the singlet component is required to explain
the observed dark matter density.
| [
{
"created": "Wed, 19 Mar 2014 20:05:16 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Feb 2016 11:01:38 GMT",
"version": "v2"
}
] | 2016-02-19 | [
[
"Khoze",
"Valentin V.",
""
],
[
"McCabe",
"Christopher",
""
],
[
"Ro",
"Gunnar",
""
]
] | We consider classically scale-invariant extensions of the Standard Model (CSI ESM) which stabilise the Higgs potential and have good dark matter candidates. In this framework all mass scales, including electroweak and dark matter masses, are generated dynamically and have a common origin. We consider Abelian and non-Abelian hidden sectors portally coupled to the SM with and without a real singlet scalar. We perform a careful analysis of RG running to determine regions in the parameter space where the SM Higgs vacuum is stabilised. After combining this with the LHC Higgs constraints, in models without a singlet, none of the regained parameter space in Abelian ESMs, and only a small section in the non-Abelian ESM survives. However, in all singlet-extended models we find that the Higgs vacuum can be stabilised in all of the parameter space consistent with the LHC constraints. These models naturally contain two dark matter candidates: the real singlet and the dark gauge boson in non-Abelian models. We determine the viable range of parameters in the CSI ESM framework by computing the relic abundance, imposing direct detection constraints and combining with the LHC Higgs constraints. In addition to being instrumental in Higgs stabilisation, we find that the singlet component is required to explain the observed dark matter density. |
hep-ph/9406371 | Patrick O'Donnell | Biswajoy Brahmachari, Patrick J. O'Donnell and Utpal Sarkar | A Model for the Three Lepton Decay Mode of the Proton | We have added a section discussing the question of numerical values
of the different scales in the evolution of the coupling constants. The
figure is included at the end of the paper | Z.Phys. C74 (1997) 171-178 | null | UTPT-94-13 | hep-ph | null | An extension of the left--right symmetric model has been constructed which
gives in a natural way the three lepton decay modes of the proton which have
been suggested as an explanation for the atmospheric neutrino anomaly. We write
down the potential which after minimization gives the proper choice of the
Higgs spectrum. With this Higgs spectrum we then study the evolution of the
gauge coupling constants and point out that for consistency one has to include
effects of gravity.
| [
{
"created": "Wed, 22 Jun 1994 18:40:36 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Feb 1995 16:24:17 GMT",
"version": "v2"
}
] | 2009-09-25 | [
[
"Brahmachari",
"Biswajoy",
""
],
[
"O'Donnell",
"Patrick J.",
""
],
[
"Sarkar",
"Utpal",
""
]
] | An extension of the left--right symmetric model has been constructed which gives in a natural way the three lepton decay modes of the proton which have been suggested as an explanation for the atmospheric neutrino anomaly. We write down the potential which after minimization gives the proper choice of the Higgs spectrum. With this Higgs spectrum we then study the evolution of the gauge coupling constants and point out that for consistency one has to include effects of gravity. |
1411.1495 | Pradeepta Guptaroy Ph.D. | P. Guptaroy, S. Guptaroy | Pion, Kaon and Antiproton Production in $Pb+Pb$ Collisions at LHC Energy
$\sqrt{s_{NN}}$ = 2.76 TeV : A Model-based Analysis | 11 pages, 2 tables, 5 figures | J. Mod. Phys. 6 (2015) 111-120 | 10.4236/jmp.2015.62015 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Large Hadron Collider (LHC) had produced a vast amount of high precision data
for high energy heavy ion collision. We attempt here to study (i) transverse
momenta spectra, (ii) $K/\pi$, $p/\pi$ ratio behaviours, (iii)rapidity
distribution, and (iv) the nuclear modification factors of the pion, kaon and
antiproton produced in $p+p$ and $Pb+Pb$ collisions at energy $\sqrt{s_{NN}}$ =
2.76 TeV, on the basis of Sequential Chain Model (SCM). Comparisons of the
model-based results with the measured data on these observables are generally
found to be modestly satisfactory.
| [
{
"created": "Thu, 6 Nov 2014 04:42:10 GMT",
"version": "v1"
}
] | 2015-02-20 | [
[
"Guptaroy",
"P.",
""
],
[
"Guptaroy",
"S.",
""
]
] | Large Hadron Collider (LHC) had produced a vast amount of high precision data for high energy heavy ion collision. We attempt here to study (i) transverse momenta spectra, (ii) $K/\pi$, $p/\pi$ ratio behaviours, (iii)rapidity distribution, and (iv) the nuclear modification factors of the pion, kaon and antiproton produced in $p+p$ and $Pb+Pb$ collisions at energy $\sqrt{s_{NN}}$ = 2.76 TeV, on the basis of Sequential Chain Model (SCM). Comparisons of the model-based results with the measured data on these observables are generally found to be modestly satisfactory. |
1903.11872 | Jun He Prof. | Jun He | Study of $P_c(4457)$, $P_c(4440)$, and $P_c(4312)$ in a quasipotential
Bethe-Salpeter equation approach | 4 pages. Version to be published on EPJC | Eur. Phys. J. C (2019) 79: 393 | 10.1140/epjc/s10052-019-6906-1 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Very recently, the LHCb Collaboration reported their new results about the
pentaquarks at charm energy region. Based on the new experimental results, we
recalculate the molecular states composed of a $\Sigma_c^{(*)}$ baryon and a
$\bar{D}^{(*)}$ meson in a quasipotential Bethe-Salpeter equation approach. The
two-peak structure around 4450 MeV can be interpreted as two $\Sigma_c
\bar{D}^*$ bound states with spin parities $1/2^-$ and $3/2^-$. The newly
observed pentaquark $P_c(4312)$ can be assigned as a $\Sigma_c\bar{D}$ bound
state with spin parity $1/2^-$. The experimental determination of spin parities
will be very helpful to understand the internal structure of these pentaquarks.
| [
{
"created": "Thu, 28 Mar 2019 10:08:03 GMT",
"version": "v1"
},
{
"created": "Sun, 28 Apr 2019 06:31:01 GMT",
"version": "v2"
}
] | 2019-05-14 | [
[
"He",
"Jun",
""
]
] | Very recently, the LHCb Collaboration reported their new results about the pentaquarks at charm energy region. Based on the new experimental results, we recalculate the molecular states composed of a $\Sigma_c^{(*)}$ baryon and a $\bar{D}^{(*)}$ meson in a quasipotential Bethe-Salpeter equation approach. The two-peak structure around 4450 MeV can be interpreted as two $\Sigma_c \bar{D}^*$ bound states with spin parities $1/2^-$ and $3/2^-$. The newly observed pentaquark $P_c(4312)$ can be assigned as a $\Sigma_c\bar{D}$ bound state with spin parity $1/2^-$. The experimental determination of spin parities will be very helpful to understand the internal structure of these pentaquarks. |
2203.09462 | Yu-Pan Zeng | Yu-Pan Zeng | Derivative Portal Dark Matter | 8 pages, 5 figures, it has been polished, and the idea is now more
clear and more precise than its previous version | null | null | null | hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | We propose a new kind of Dark Matter: Derivative Portal Dark Matter. This
kind of Dark Matter connects to the Standard Model through a massive mediator,
which links to the Standard Model in derivative form. The derivative of a
mediator in momentum space corresponds to the mediated momentum, which vanishes
in the zero momentum transfer limit. As a result, this kind of Dark Matter can
evade stringent constraint from the Dark Matter direct detection while fitting
the Dark Matter relic density observation naturally.
| [
{
"created": "Mon, 14 Mar 2022 13:50:01 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Jun 2022 14:39:14 GMT",
"version": "v2"
},
{
"created": "Sat, 29 Apr 2023 10:32:00 GMT",
"version": "v3"
}
] | 2023-05-02 | [
[
"Zeng",
"Yu-Pan",
""
]
] | We propose a new kind of Dark Matter: Derivative Portal Dark Matter. This kind of Dark Matter connects to the Standard Model through a massive mediator, which links to the Standard Model in derivative form. The derivative of a mediator in momentum space corresponds to the mediated momentum, which vanishes in the zero momentum transfer limit. As a result, this kind of Dark Matter can evade stringent constraint from the Dark Matter direct detection while fitting the Dark Matter relic density observation naturally. |
2105.02688 | Zhi-Qing Zhang | Zhi-Qing Zhang, Meng-Ge Wang, Yan-Chao Zhao, Zhi-Lin Guan, Na Wang | Probing $D^*_{s0}(2317)$ in the decays of $B$ to two charmed mesons | 19 pages, 2 figures | Phys. Rev. D 103, 116030 (2021) | 10.1103/PhysRevD.103.116030 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We probe the inner structure of the meson $D^*_{s0}(2317)$ through the decays
of $B_{(s)}$ to two charmed mesons within pQCD approach. Assuming
$D^*_{s0}(2317)$ as a scalar meson with $\bar cs$ structure, we find that the
predictions for the branching ratios of the decays $B^+\to
D^{*+}_{s0}(2317)\bar D^{(*)0}, B^0\to D^{*+}_{s0}(2317)D^{(*)-}$ can explain
data within errors. The branching ratios for the decays $B_s\to
D^{*+}_{s0}(2317)D_s^{(*)+}$ are estimated to reach up to $10^{-3}$ order,
which can be observed by the present LHCb and SuperKEKB experiments. In this
work, the decay constant of the meson $D^*_{s0}(2317)$ is an input parameter.
Unfortunately, its value has been studied by many references but with large
uncertainties. Our calculation shows that a smaller decay constant of the meson
$D^*_{s0}(2317)$ is supported by compared with the present data, say $55\sim70$
MeV. We also calculate the ratios $R_1=\frac{Br(B^+\to D^{*+}_{s0}(2317)\bar
D^0)}{Br(B^+\to D^{*+}_{s0}(2317)\bar D^{*0})})$ and $R_2=\frac{Br(B^0\to
D^{*+}_{s0}(2317)D^-)}{Br(B^0\to D^{*+}_{s0}(2317)D^{*-})}$, which are valuable
to determine the inner structure of $D^*_{s0}(2317)$ by compared with the
experimental results. Our predictions for the ratios $R_{1,2}$ are consistent
with the present data within errors.We expect that these two ratios can be well
measured by the future experiments through improving the measurement accuracy
for the decays $B^+\to D^{*+}_{s0}(2317)\bar D^{*0}$ and $B^0\to
D^{*+}_{s0}(2317)D^{*-}$.
| [
{
"created": "Thu, 6 May 2021 14:09:19 GMT",
"version": "v1"
}
] | 2021-07-07 | [
[
"Zhang",
"Zhi-Qing",
""
],
[
"Wang",
"Meng-Ge",
""
],
[
"Zhao",
"Yan-Chao",
""
],
[
"Guan",
"Zhi-Lin",
""
],
[
"Wang",
"Na",
""
]
] | We probe the inner structure of the meson $D^*_{s0}(2317)$ through the decays of $B_{(s)}$ to two charmed mesons within pQCD approach. Assuming $D^*_{s0}(2317)$ as a scalar meson with $\bar cs$ structure, we find that the predictions for the branching ratios of the decays $B^+\to D^{*+}_{s0}(2317)\bar D^{(*)0}, B^0\to D^{*+}_{s0}(2317)D^{(*)-}$ can explain data within errors. The branching ratios for the decays $B_s\to D^{*+}_{s0}(2317)D_s^{(*)+}$ are estimated to reach up to $10^{-3}$ order, which can be observed by the present LHCb and SuperKEKB experiments. In this work, the decay constant of the meson $D^*_{s0}(2317)$ is an input parameter. Unfortunately, its value has been studied by many references but with large uncertainties. Our calculation shows that a smaller decay constant of the meson $D^*_{s0}(2317)$ is supported by compared with the present data, say $55\sim70$ MeV. We also calculate the ratios $R_1=\frac{Br(B^+\to D^{*+}_{s0}(2317)\bar D^0)}{Br(B^+\to D^{*+}_{s0}(2317)\bar D^{*0})})$ and $R_2=\frac{Br(B^0\to D^{*+}_{s0}(2317)D^-)}{Br(B^0\to D^{*+}_{s0}(2317)D^{*-})}$, which are valuable to determine the inner structure of $D^*_{s0}(2317)$ by compared with the experimental results. Our predictions for the ratios $R_{1,2}$ are consistent with the present data within errors.We expect that these two ratios can be well measured by the future experiments through improving the measurement accuracy for the decays $B^+\to D^{*+}_{s0}(2317)\bar D^{*0}$ and $B^0\to D^{*+}_{s0}(2317)D^{*-}$. |
0902.1498 | Let\'icia Faria Domingues Palhares | Eduardo S. Fraga, Leticia F. Palhares, and Marcus Benghi Pinto | Nonperturbative Yukawa theory at finite density and temperature | 18 pages, 15 figures; v2: references added, improved discussion in
the Conclusions, matches published version | Phys.Rev.D79:065026,2009 | 10.1103/PhysRevD.79.065026 | null | hep-ph cond-mat.str-el nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In-medium Yukawa theory is part of the thermodynamics of the Standard Model
of particle physics and is one of the main building blocks of most effective
field theories of fermionic systems. By computing its pressure we investigate
the nonperturbative thermodynamics at finite temperature and density using the
optimized perturbation theory (OPT) framework. Our calculations are valid for
arbitrary fermion and scalar masses, temperature, chemical potential, and not
restricted to weak coupling. The model is considered in the presence as well as
in the absence of condensates. Comparison with nonperturbative results shows
that second order perturbation theory (PT) fails in the first case but performs
rather well when condensates are absent, even at high-temperature regimes.
| [
{
"created": "Mon, 9 Feb 2009 19:28:52 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Mar 2009 11:52:38 GMT",
"version": "v2"
}
] | 2009-09-24 | [
[
"Fraga",
"Eduardo S.",
""
],
[
"Palhares",
"Leticia F.",
""
],
[
"Pinto",
"Marcus Benghi",
""
]
] | In-medium Yukawa theory is part of the thermodynamics of the Standard Model of particle physics and is one of the main building blocks of most effective field theories of fermionic systems. By computing its pressure we investigate the nonperturbative thermodynamics at finite temperature and density using the optimized perturbation theory (OPT) framework. Our calculations are valid for arbitrary fermion and scalar masses, temperature, chemical potential, and not restricted to weak coupling. The model is considered in the presence as well as in the absence of condensates. Comparison with nonperturbative results shows that second order perturbation theory (PT) fails in the first case but performs rather well when condensates are absent, even at high-temperature regimes. |
hep-ph/9505400 | Rey Soo Jong | Junegone Chay and Soo-Jong REY | Normalization of the Perturbative QCD Corrections for $B\to X_s \,
\gamma$ Decay | 13 pages, REVTEX, 2 ps figure-files are attached | null | null | SNUTP-95-050 | hep-ph | null | We study the normalization of perturbative QCD corrections to the inclusive
$B \rightarrow X_s \gamma$ decay. We propose to set the renormalization scale
using the Brodsky-Lepage-Mackenzie (BLM) method. In the proposed method the
scale is determined by absorbing the vacuum polarization correction from light
fermions to renormalization scale but not including the anomalous dimensions.
The BLM scale depends in general on the renormalization scheme and the
factorization scale. We find that the BLM scale is insensitive to the
factorization scale. In the heavy-quark potential scheme, we find that the BLM
scale is $\mu_{BLM} \approx (0.315 - 0.334) m_b$ when the factorization scale
varies from $m_b/2$ to $2 m_b$.
| [
{
"created": "Mon, 29 May 1995 11:57:22 GMT",
"version": "v1"
},
{
"created": "Tue, 30 May 1995 06:46:06 GMT",
"version": "v2"
}
] | 2008-02-03 | [
[
"Chay",
"Junegone",
""
],
[
"REY",
"Soo-Jong",
""
]
] | We study the normalization of perturbative QCD corrections to the inclusive $B \rightarrow X_s \gamma$ decay. We propose to set the renormalization scale using the Brodsky-Lepage-Mackenzie (BLM) method. In the proposed method the scale is determined by absorbing the vacuum polarization correction from light fermions to renormalization scale but not including the anomalous dimensions. The BLM scale depends in general on the renormalization scheme and the factorization scale. We find that the BLM scale is insensitive to the factorization scale. In the heavy-quark potential scheme, we find that the BLM scale is $\mu_{BLM} \approx (0.315 - 0.334) m_b$ when the factorization scale varies from $m_b/2$ to $2 m_b$. |
2201.07146 | Jan Klamka | Jan Klamka and Aleksander Filip Zarnecki | Pair-production of the charged IDM scalars at high energy CLIC | 17 pages, 8 figures. Revision for journal publication | Eur. Phys. J. C 82 (2022) 8, 738 | 10.1140/epjc/s10052-022-10615-3 | CLICdp-Pub-2022-001 | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | The Inert Doublet Model (IDM) is a simple extension of the Standard Model,
introducing an additional Higgs doublet that brings in four new scalar
particles. The lightest of the IDM scalars is stable and is a good candidate
for a dark matter particle. The potential of discovering the IDM scalars in the
experiment at the Compact Linear Collider (CLIC), an e$^{+}$e$^{-}$ collider
proposed as the next generation infrastructure at CERN, has been tested for two
high-energy running stages, at 1.5 TeV and 3 TeV centre-of-mass energy. The
CLIC sensitivity to pair-production of the charged IDM scalars was studied
using the full detector simulation with GEANT4 for selected high-mass IDM
benchmark scenarios and the semi-leptonic final state. To extrapolate full
simulation results to a wider range of IDM benchmark scenarios, the CLIC
detector model defined in the DELPHES fast simulation framework was modified to
take into account the $\gamma\gamma \rightarrow$ had. beam-induced background.
Results of the study indicate that heavy charged IDM scalars can be discovered
at CLIC for most of the considered benchmark scenarios, up to masses of the
order of 1 TeV.
| [
{
"created": "Tue, 18 Jan 2022 17:44:39 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Jan 2022 13:39:25 GMT",
"version": "v2"
},
{
"created": "Fri, 1 Jul 2022 14:43:32 GMT",
"version": "v3"
}
] | 2022-11-01 | [
[
"Klamka",
"Jan",
""
],
[
"Zarnecki",
"Aleksander Filip",
""
]
] | The Inert Doublet Model (IDM) is a simple extension of the Standard Model, introducing an additional Higgs doublet that brings in four new scalar particles. The lightest of the IDM scalars is stable and is a good candidate for a dark matter particle. The potential of discovering the IDM scalars in the experiment at the Compact Linear Collider (CLIC), an e$^{+}$e$^{-}$ collider proposed as the next generation infrastructure at CERN, has been tested for two high-energy running stages, at 1.5 TeV and 3 TeV centre-of-mass energy. The CLIC sensitivity to pair-production of the charged IDM scalars was studied using the full detector simulation with GEANT4 for selected high-mass IDM benchmark scenarios and the semi-leptonic final state. To extrapolate full simulation results to a wider range of IDM benchmark scenarios, the CLIC detector model defined in the DELPHES fast simulation framework was modified to take into account the $\gamma\gamma \rightarrow$ had. beam-induced background. Results of the study indicate that heavy charged IDM scalars can be discovered at CLIC for most of the considered benchmark scenarios, up to masses of the order of 1 TeV. |
0805.4499 | Veselov Alexander | Yu.A.Simonov, A.I.Veselov | Strong decays and dipion transitions of Upsilon(5S) | 16 pages, 6 figures | Phys.Lett.B671:55-59,2009 | 10.1016/j.physletb.2008.12.001 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Dipion transitions of $\Upsilon (nS)$ with $n=5, n'=1,2,3$ are studied using
the Field Correlator Method, applied previously to dipion transitions with
$n=2,3,4$ The only two parameters of effective Lagrangian were fixed in that
earlier study, and total widths $\Gamma_{\pi\pi} (5, n')$ as well as pionless
decay widths $\Gamma_{BB} (5S), \Gamma_{BB^*} (5S), \Gamma_{B^*B^*}(5S)$ and
$\Gamma_{KK} (5, n')$ were calculated and are in a reasonable agreement with
experiment. The experimental $\pi\pi$ spectra for $(5,1)$ and (5,2) transitions
are well reproduced taking into account FSI in the $\pi\pi$.
| [
{
"created": "Thu, 29 May 2008 10:00:45 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Sep 2008 10:17:33 GMT",
"version": "v2"
}
] | 2009-01-16 | [
[
"Simonov",
"Yu. A.",
""
],
[
"Veselov",
"A. I.",
""
]
] | Dipion transitions of $\Upsilon (nS)$ with $n=5, n'=1,2,3$ are studied using the Field Correlator Method, applied previously to dipion transitions with $n=2,3,4$ The only two parameters of effective Lagrangian were fixed in that earlier study, and total widths $\Gamma_{\pi\pi} (5, n')$ as well as pionless decay widths $\Gamma_{BB} (5S), \Gamma_{BB^*} (5S), \Gamma_{B^*B^*}(5S)$ and $\Gamma_{KK} (5, n')$ were calculated and are in a reasonable agreement with experiment. The experimental $\pi\pi$ spectra for $(5,1)$ and (5,2) transitions are well reproduced taking into account FSI in the $\pi\pi$. |
1904.08399 | Farvah Mahmoudi | A. Arbey, T. Hurth, F. Mahmoudi, D. Martinez Santos, S. Neshatpour | Update on the b->s anomalies | 7 pages, 3 figures, 3 tables. Addendum to Phys. Rev. D96 (2017)
095034 and Phys. Rev. D98 (2018) 095027 | Phys. Rev. D 100, 015045 (2019) | 10.1103/PhysRevD.100.015045 | CERN-TH-2019-048, IPM/P.A-544, MITP/19-026 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a brief update of our model-independent analyses of the b->s data
presented in the articles published in Phys. Rev. D96 (2017) 095034 and Phys.
Rev. D98 (2018) 095027 based on new data on R_K by LHCb, on R_{K^*} by Belle,
and on B_{s,d}-> mu^+ mu^- by ATLAS.
| [
{
"created": "Wed, 17 Apr 2019 17:55:25 GMT",
"version": "v1"
},
{
"created": "Mon, 13 May 2019 12:35:44 GMT",
"version": "v2"
}
] | 2019-08-07 | [
[
"Arbey",
"A.",
""
],
[
"Hurth",
"T.",
""
],
[
"Mahmoudi",
"F.",
""
],
[
"Santos",
"D. Martinez",
""
],
[
"Neshatpour",
"S.",
""
]
] | We present a brief update of our model-independent analyses of the b->s data presented in the articles published in Phys. Rev. D96 (2017) 095034 and Phys. Rev. D98 (2018) 095027 based on new data on R_K by LHCb, on R_{K^*} by Belle, and on B_{s,d}-> mu^+ mu^- by ATLAS. |
hep-ph/9801351 | null | Mayumi Aoki (Graduate School of Humanities and Sciences, Ochanomizu
University), Noriyuki Oshimo (Institute for Cosmic Ray Research, University
of Tokyo), Akio Sugamoto (Department of Physics, Ochanomizu University) | Electroweak Baryogenesis and Neutron Electric Dipole Moment from
Supersymmetry | 4 pages, To appear in the Proceedings of the 3rd RESCEU International
Symposium on Particle Cosmology | null | null | OCHA-PP-113 | hep-ph | null | Baryogenesis at the electroweak phase transition is discussed within the
framework of the supersymmetric standard model. Implications of baryon
asymmetry for the electric dipole moment of the neutron are also studied.
| [
{
"created": "Tue, 20 Jan 1998 05:08:14 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Aoki",
"Mayumi",
"",
"Graduate School of Humanities and Sciences, Ochanomizu\n University"
],
[
"Oshimo",
"Noriyuki",
"",
"Institute for Cosmic Ray Research, University\n of Tokyo"
],
[
"Sugamoto",
"Akio",
"",
"Department of Physics, Ochanomizu University"
]
] | Baryogenesis at the electroweak phase transition is discussed within the framework of the supersymmetric standard model. Implications of baryon asymmetry for the electric dipole moment of the neutron are also studied. |
2408.07366 | Rui Zhu | Lianyou Shan, Lei Wang, Jin Min Yang and Rui Zhu | Probing a light long-lived pseudo-scalar from Higgs decay via displaced
taus at the LHC | 18 pages, 6 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A light (GeV mass) long-lived ($c\tau$ around dozens of millimeters) CP-odd
scalar can be readily predicted in new physics models. In this work we
investigate the Higgs decay into such a light scalar plus a $Z$-boson and take
the aligned two-Higgs-doublet model (2HDM) as an example. This light long-lived
scalar, with the dominant decay to tau leptons, will fly over a distance from
the production point and present a displaced vertex in an Inner Detector of a
generally purposed experiment like ATLAS or CMS. In our study we focus on the
LHC experiment and perform Monte Carlo simulations for the signal and
backgrounds. We demonstrate some benchmark points for the aligned 2HDM and find
the signal to be detectable when the luminosity is accumulated to 300
fb$^{-1}$. So our study suggests an experimental search for this process in the
ongoing LHC.
| [
{
"created": "Wed, 14 Aug 2024 08:25:57 GMT",
"version": "v1"
}
] | 2024-08-15 | [
[
"Shan",
"Lianyou",
""
],
[
"Wang",
"Lei",
""
],
[
"Yang",
"Jin Min",
""
],
[
"Zhu",
"Rui",
""
]
] | A light (GeV mass) long-lived ($c\tau$ around dozens of millimeters) CP-odd scalar can be readily predicted in new physics models. In this work we investigate the Higgs decay into such a light scalar plus a $Z$-boson and take the aligned two-Higgs-doublet model (2HDM) as an example. This light long-lived scalar, with the dominant decay to tau leptons, will fly over a distance from the production point and present a displaced vertex in an Inner Detector of a generally purposed experiment like ATLAS or CMS. In our study we focus on the LHC experiment and perform Monte Carlo simulations for the signal and backgrounds. We demonstrate some benchmark points for the aligned 2HDM and find the signal to be detectable when the luminosity is accumulated to 300 fb$^{-1}$. So our study suggests an experimental search for this process in the ongoing LHC. |
1304.7779 | Kuver Sinha | Andres G. Delannoy, Bhaskar Dutta, Alfredo Gurrola, Will Johns, Teruki
Kamon, Eduardo Luiggi, Andrew Melo, Paul Sheldon, Kuver Sinha, Kechen Wang,
Sean Wu | Probing Dark Matter at the LHC using Vector Boson Fusion Processes | 4 pages, 5 figures | null | 10.1103/PhysRevLett.111.061801 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Vector boson fusion (VBF) processes at the Large Hadron Collider (LHC)
provide a unique opportunity to search for new physics with electroweak
couplings. A feasibility study for the search of supersymmetric dark matter in
the final state of two VBF jets and large missing transverse energy is
presented at 14 TeV. Prospects for determining the dark matter relic density
are studied for the cases of Wino and Bino-Higgsino dark matter. The LHC could
probe Wino dark matter with mass up to approximately 600 GeV with a luminosity
of 1000 fb$^{-1}$.
| [
{
"created": "Mon, 29 Apr 2013 20:00:11 GMT",
"version": "v1"
}
] | 2013-08-14 | [
[
"Delannoy",
"Andres G.",
""
],
[
"Dutta",
"Bhaskar",
""
],
[
"Gurrola",
"Alfredo",
""
],
[
"Johns",
"Will",
""
],
[
"Kamon",
"Teruki",
""
],
[
"Luiggi",
"Eduardo",
""
],
[
"Melo",
"Andrew",
""
],
[
"Sheldon",
"Paul",
""
],
[
"Sinha",
"Kuver",
""
],
[
"Wang",
"Kechen",
""
],
[
"Wu",
"Sean",
""
]
] | Vector boson fusion (VBF) processes at the Large Hadron Collider (LHC) provide a unique opportunity to search for new physics with electroweak couplings. A feasibility study for the search of supersymmetric dark matter in the final state of two VBF jets and large missing transverse energy is presented at 14 TeV. Prospects for determining the dark matter relic density are studied for the cases of Wino and Bino-Higgsino dark matter. The LHC could probe Wino dark matter with mass up to approximately 600 GeV with a luminosity of 1000 fb$^{-1}$. |
hep-ph/9805312 | Vadim Troitsky | A. F. Krutov (Samara State University), V. E. Troitsky (Institute of
Nuclear Physics, Moscow State University) | The Asymptotics of Pion Charge Form Factor | 13 pages, LaTeX, no figures, to be published in Theor. Math. Phys | null | null | null | hep-ph | null | The asymptotics of pion charge form factor is obtained in the framework of
relativistic Hamiltonian dynamics for the infinite value limit of momentum
transfer and zero value limit of constituent--quark mass. It is shown that this
asymptotics is the same as given by the perturbative QCD and is determined by
relativistic kinematics only, being independent on the constituent quarks
interaction in pion.
| [
{
"created": "Wed, 13 May 1998 15:04:27 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Krutov",
"A. F.",
"",
"Samara State University"
],
[
"Troitsky",
"V. E.",
"",
"Institute of\n Nuclear Physics, Moscow State University"
]
] | The asymptotics of pion charge form factor is obtained in the framework of relativistic Hamiltonian dynamics for the infinite value limit of momentum transfer and zero value limit of constituent--quark mass. It is shown that this asymptotics is the same as given by the perturbative QCD and is determined by relativistic kinematics only, being independent on the constituent quarks interaction in pion. |
2402.07372 | Diana Rosales Herrera | D. Rosales Herrera, J. R. Alvarado Garc\'ia, A. Fern\'andez T\'ellez,
J. E. Ram\'irez, C. Pajares | Entropy and Heat Capacity of the transverse momentum distribution for pp
collisions at RHIC and LHC energies | 12 pages, 10 figures. Accepted for publication in Physical Review C | Phys. Rev. C 109, 034915 (2024) | 10.1103/PhysRevC.109.034915 | null | hep-ph cond-mat.stat-mech | http://creativecommons.org/licenses/by/4.0/ | We investigate the transverse momentum distribution (TMD) statistics from
three different theoretical approaches. In particular, we explore the framework
used for string models, wherein the particle production is given by the
Schwinger mechanism. The thermal distribution arises from the Gaussian
fluctuations of the string tension. The hard part of the TMD can be reproduced
by considering heavy tailed string tension fluctuations, for instance, the
Tsallis $q$-Gaussian function, giving rise to a confluent hypergeometric
function that fits the entire experimental TMD data. We also discuss the
QCD-based Hagerdon function, another family of fitting functions frequently
used to describe the spectrum. We analyze the experimental data of minimum bias
pp collisions reported by the BNL Relativistic Heavy Ion Collider (RHIC) and
the CERN Large Hadron Collider (LHC) experiments (from $\sqrt{s}=0.2$ TeV to
$\sqrt{s}=13$ TeV). We extracted the corresponding temperature by studying the
behavior of the spectra at low transverse momentum values. For the three
approaches, we compute all moments, highlighting the average, variance, and
kurtosis. Finally, we compute the Shannon entropy and the heat capacity through
the entropy derivative with respect to the temperature. We found that the
$q$-Gaussian string tension fluctuations lead to a monotonically increasing
heat capacity as a function of the center of mass energy, which is also
observed for the Hagedorn fitting function. This behavior is consistent with
the experimental observation that the temperature slowly rises with increments
of the collision energy.
| [
{
"created": "Mon, 12 Feb 2024 02:12:06 GMT",
"version": "v1"
}
] | 2024-03-22 | [
[
"Herrera",
"D. Rosales",
""
],
[
"García",
"J. R. Alvarado",
""
],
[
"Téllez",
"A. Fernández",
""
],
[
"Ramírez",
"J. E.",
""
],
[
"Pajares",
"C.",
""
]
] | We investigate the transverse momentum distribution (TMD) statistics from three different theoretical approaches. In particular, we explore the framework used for string models, wherein the particle production is given by the Schwinger mechanism. The thermal distribution arises from the Gaussian fluctuations of the string tension. The hard part of the TMD can be reproduced by considering heavy tailed string tension fluctuations, for instance, the Tsallis $q$-Gaussian function, giving rise to a confluent hypergeometric function that fits the entire experimental TMD data. We also discuss the QCD-based Hagerdon function, another family of fitting functions frequently used to describe the spectrum. We analyze the experimental data of minimum bias pp collisions reported by the BNL Relativistic Heavy Ion Collider (RHIC) and the CERN Large Hadron Collider (LHC) experiments (from $\sqrt{s}=0.2$ TeV to $\sqrt{s}=13$ TeV). We extracted the corresponding temperature by studying the behavior of the spectra at low transverse momentum values. For the three approaches, we compute all moments, highlighting the average, variance, and kurtosis. Finally, we compute the Shannon entropy and the heat capacity through the entropy derivative with respect to the temperature. We found that the $q$-Gaussian string tension fluctuations lead to a monotonically increasing heat capacity as a function of the center of mass energy, which is also observed for the Hagedorn fitting function. This behavior is consistent with the experimental observation that the temperature slowly rises with increments of the collision energy. |
2108.12735 | Zhengyu Chen | Zhengyu Chen, Zeyan Wang, Carsten Greiner, Zhe Xu | Splitting of elliptic flow in non-central relativistic heavy-ion
collisions | 6 pages, 6 figures; add a passage in the end, add references | null | null | null | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We predict a new effect due to the presence of the global vorticity in
non-central relativistic heavy-ion collisions, namely a splitting of the
elliptic flow parameter $v_2$ at non-zero rapidity. The size of the splitting
is proposed as a new observable that can be used to constrain the initial
vortical configuration of the produced QCD matter in experiments. The new
findings are demonstrated by numerical calculations employing the parton
cascade model, Boltzmann Approach of MultiParton Scatterings (BAMPS), for
non-central Au + Au collisions at $\sqrt{s_{NN}} = 200 \ GeV$.
| [
{
"created": "Sun, 29 Aug 2021 02:52:15 GMT",
"version": "v1"
},
{
"created": "Fri, 15 Oct 2021 10:17:34 GMT",
"version": "v2"
}
] | 2021-10-18 | [
[
"Chen",
"Zhengyu",
""
],
[
"Wang",
"Zeyan",
""
],
[
"Greiner",
"Carsten",
""
],
[
"Xu",
"Zhe",
""
]
] | We predict a new effect due to the presence of the global vorticity in non-central relativistic heavy-ion collisions, namely a splitting of the elliptic flow parameter $v_2$ at non-zero rapidity. The size of the splitting is proposed as a new observable that can be used to constrain the initial vortical configuration of the produced QCD matter in experiments. The new findings are demonstrated by numerical calculations employing the parton cascade model, Boltzmann Approach of MultiParton Scatterings (BAMPS), for non-central Au + Au collisions at $\sqrt{s_{NN}} = 200 \ GeV$. |
1603.08527 | Jorge Segovia | Jorge Segovia | Effective field theory investigations of the XYZ puzzle | 5 pages; contribution to the proceedings of the FAIRNESS2016:
Workshop for young scientists with research interests focused on physics at
FAIR. 14-19 February 2016. Garmisch-Partenkirchen, Germany | null | 10.1088/1742-6596/742/1/012005 | null | hep-ph hep-ex hep-lat nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Quantum Chromodynamics, the theory of strong interactions, predicts several
types of bound states. Among them are mesons ($q\bar{q}$) and baryons ($qqq$),
which have been the only states observed in experiments for years. However, in
the last decade, many states that do not fit this picture have been observed at
$B$-factories (BaBar, Belle and CLEO), at $\tau$-charm facilities (CLEO-c,
BESIII) and also at proton-proton colliders (CDF, D0, LHCb, ATLAS, CMS). There
is growing evidence that at least some of the new charmonium- and
bottomonium-like states, the so-called XYZ mesons, are new forms of matter such
as quark-gluon hybrids, mesonic molecules or different arrangements of
tetraquarks, pentaquarks... Effective Field Theories (EFTs) have been
constructed for heavy-quark-antiquark bound states, but a general study of the
XYZ mesons within the same framework has not yet been done. The scope of this
conference proceedings is to discuss the possibilities we have in developing
novel EFTs that, characterizing the conventional quarkonium states, facilitate
also the systematic and model-independent description of the new exotic matter,
in particular, the hybrid mesons.
| [
{
"created": "Mon, 28 Mar 2016 20:00:27 GMT",
"version": "v1"
}
] | 2016-11-03 | [
[
"Segovia",
"Jorge",
""
]
] | Quantum Chromodynamics, the theory of strong interactions, predicts several types of bound states. Among them are mesons ($q\bar{q}$) and baryons ($qqq$), which have been the only states observed in experiments for years. However, in the last decade, many states that do not fit this picture have been observed at $B$-factories (BaBar, Belle and CLEO), at $\tau$-charm facilities (CLEO-c, BESIII) and also at proton-proton colliders (CDF, D0, LHCb, ATLAS, CMS). There is growing evidence that at least some of the new charmonium- and bottomonium-like states, the so-called XYZ mesons, are new forms of matter such as quark-gluon hybrids, mesonic molecules or different arrangements of tetraquarks, pentaquarks... Effective Field Theories (EFTs) have been constructed for heavy-quark-antiquark bound states, but a general study of the XYZ mesons within the same framework has not yet been done. The scope of this conference proceedings is to discuss the possibilities we have in developing novel EFTs that, characterizing the conventional quarkonium states, facilitate also the systematic and model-independent description of the new exotic matter, in particular, the hybrid mesons. |
hep-ph/0110126 | Tim M. P. Tait | David E. Kaplan and Tim M.P. Tait | New Tools for Fermion Masses from Extra Dimensions | Latex using JHEP style; 28 pages | JHEP 0111:051,2001 | null | ANL-HEP-PR-01-081, EFI-01-44, SLAC-PUB-9021 | hep-ph | null | We present models in which the observed fermion masses and mixings are
generated by dynamically localizing the three generations of matter in a flat
compact extra dimension. We first construct models assuming the hierarchy
problem is addressed by the existence of large extra dimensions, i.e. the
fundamental scale is not far above a TeV and supersymmetry is not imposed.
These models are compactified, chiral, and don't require fine-tuning to
generate the top mass. Limits on the compactification scale based on
flavor-changing neutral currents are relaxed compared to those on existing
models. We then supersymmetrize some of these models. Using N=1 superspace
language in extra dimensions, we find space-dependent flat directions which can
be used to localize fields. Finally, we discuss methods of breaking
supersymmetry and the impact of these models on the superpartner spectrum.
| [
{
"created": "Tue, 9 Oct 2001 19:13:59 GMT",
"version": "v1"
}
] | 2010-02-03 | [
[
"Kaplan",
"David E.",
""
],
[
"Tait",
"Tim M. P.",
""
]
] | We present models in which the observed fermion masses and mixings are generated by dynamically localizing the three generations of matter in a flat compact extra dimension. We first construct models assuming the hierarchy problem is addressed by the existence of large extra dimensions, i.e. the fundamental scale is not far above a TeV and supersymmetry is not imposed. These models are compactified, chiral, and don't require fine-tuning to generate the top mass. Limits on the compactification scale based on flavor-changing neutral currents are relaxed compared to those on existing models. We then supersymmetrize some of these models. Using N=1 superspace language in extra dimensions, we find space-dependent flat directions which can be used to localize fields. Finally, we discuss methods of breaking supersymmetry and the impact of these models on the superpartner spectrum. |
hep-ph/0511346 | Zhun Lu | Zhun Lu, Ivan Schmidt | Generalized Distribution Amplitudes at the $Z$ pole | Analysis of Bremsstrahlung process added, references and one figure
added, misprint corrected,published version | Phys.Rev. D73 (2006) 013012 | 10.1103/PhysRevD.73.013012 | USM-TH-175 | hep-ph | null | We investigate the exclusive two-pion production at the $Z$-pole through the
process $e^+e^-\to Z \to \pi\pi \gamma$. In the kinematical region where the
invariant mass of the two pions is much smaller than the mass of the $Z$ boson,
the process can be factorized into the convolution of a hard coefficient and a
soft matrix element, the generalized distribution amplitude of two pions. We
calculate the differential cross-section of charged pion pair production and
neutral pion pair production and find the former to be much larger than the
later. We show that combining the measurements of charged pion pair production
and neutral pion pair production at the $Z$-pole provides a convenient approach
to access the $C$-odd part of the $2\pi$ distribution amplitudes.
| [
{
"created": "Wed, 30 Nov 2005 17:34:08 GMT",
"version": "v1"
},
{
"created": "Fri, 27 Jan 2006 18:00:29 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Lu",
"Zhun",
""
],
[
"Schmidt",
"Ivan",
""
]
] | We investigate the exclusive two-pion production at the $Z$-pole through the process $e^+e^-\to Z \to \pi\pi \gamma$. In the kinematical region where the invariant mass of the two pions is much smaller than the mass of the $Z$ boson, the process can be factorized into the convolution of a hard coefficient and a soft matrix element, the generalized distribution amplitude of two pions. We calculate the differential cross-section of charged pion pair production and neutral pion pair production and find the former to be much larger than the later. We show that combining the measurements of charged pion pair production and neutral pion pair production at the $Z$-pole provides a convenient approach to access the $C$-odd part of the $2\pi$ distribution amplitudes. |
1807.09812 | Johannes Henn | T. Gehrmann, J. M. Henn, N. A. Lo Presti | Pentagon functions for massless planar scattering amplitudes | 36 pages | null | 10.1007/JHEP10(2018)103 | ZU-TH 25/18, MPP-2018-180, MITP/18-067, IPPP/18/59 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Loop amplitudes for massless five particle scattering processes contain
Feynman integrals depending on the external momentum invariants: pentagon
functions. We perform a detailed study of the analyticity properties and cut
structure of these functions up to two loops in the planar case, where we
classify and identify the minimal set of basis functions. They are computed
from the canonical form of their differential equations and expressed in terms
of generalized polylogarithms, or alternatively as one-dimensional integrals.
We present analytical expressions and numerical evaluation routines for these
pentagon functions, in all kinematical configurations relevant to five-particle
scattering processes.
| [
{
"created": "Wed, 25 Jul 2018 18:30:50 GMT",
"version": "v1"
}
] | 2018-11-14 | [
[
"Gehrmann",
"T.",
""
],
[
"Henn",
"J. M.",
""
],
[
"Presti",
"N. A. Lo",
""
]
] | Loop amplitudes for massless five particle scattering processes contain Feynman integrals depending on the external momentum invariants: pentagon functions. We perform a detailed study of the analyticity properties and cut structure of these functions up to two loops in the planar case, where we classify and identify the minimal set of basis functions. They are computed from the canonical form of their differential equations and expressed in terms of generalized polylogarithms, or alternatively as one-dimensional integrals. We present analytical expressions and numerical evaluation routines for these pentagon functions, in all kinematical configurations relevant to five-particle scattering processes. |
1511.05066 | Ryoutaro Watanabe | Tetsuya Enomoto and Ryoutaro Watanabe | Flavor constraints on the Two Higgs Doublet Models of $Z_2$ symmetric
and aligned types | 44pages, 7figures, references added, figure refined, published
version | null | 10.1007/JHEP05(2016)002 | OU-HET-882, CTPU-15-17 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We give a comprehensive study from flavor observables of pion, kaon, D_(s),
and B_(s) mesons for limiting the Two Higgs Doublet Models (2HDMs) with natural
flavor conservation, namely, Z_2 symmetric and aligned type of models. With use
of the updated studies and analyses of B -> tau nu, D -> mu nu, D_s -> tau nu,
D_s -> mu nu, K -> mu nu, Pi -> mu nu, B^0_s -> mu^+ mu^-, B^0_d -> mu^+ mu^-,
tau -> K nu, tau -> Pi nu, B -> X_s gamma, K-K bar mixing, B^0_d-B^0_d bar
mixing, and B^0_s-B^0_s bar mixing, we obtain constraints on the parameters in
the 2HDMs. To calculate the constraints, we pay attention to a determination of
CKM matrix elements and re-fit them to experimental data so that new
contributions from additional Higgs bosons do not affect the determination. In
addition, we discuss excesses of observables in the muon anomalous magnetic
moment and the semi-tauonic B meson decays in the context of the 2HDM.
| [
{
"created": "Mon, 16 Nov 2015 17:56:21 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Dec 2015 00:52:33 GMT",
"version": "v2"
},
{
"created": "Mon, 11 Jul 2016 06:28:20 GMT",
"version": "v3"
}
] | 2016-07-12 | [
[
"Enomoto",
"Tetsuya",
""
],
[
"Watanabe",
"Ryoutaro",
""
]
] | We give a comprehensive study from flavor observables of pion, kaon, D_(s), and B_(s) mesons for limiting the Two Higgs Doublet Models (2HDMs) with natural flavor conservation, namely, Z_2 symmetric and aligned type of models. With use of the updated studies and analyses of B -> tau nu, D -> mu nu, D_s -> tau nu, D_s -> mu nu, K -> mu nu, Pi -> mu nu, B^0_s -> mu^+ mu^-, B^0_d -> mu^+ mu^-, tau -> K nu, tau -> Pi nu, B -> X_s gamma, K-K bar mixing, B^0_d-B^0_d bar mixing, and B^0_s-B^0_s bar mixing, we obtain constraints on the parameters in the 2HDMs. To calculate the constraints, we pay attention to a determination of CKM matrix elements and re-fit them to experimental data so that new contributions from additional Higgs bosons do not affect the determination. In addition, we discuss excesses of observables in the muon anomalous magnetic moment and the semi-tauonic B meson decays in the context of the 2HDM. |
2109.11686 | Craig Roberts | Khepani Raya, Zhu-Fang Cui, Lei Chang, Jose-Manuel Morgado, Craig D.
Roberts and Jose Rodriguez-Quintero | Revealing pion and kaon structure via generalised parton distributions | 22 pages, 19 figures, 2 tables | null | 10.1088/1674-1137/ac3071 | NJU-INP 051/21 | hep-ph hep-ex hep-lat nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Clear windows onto emergent hadron mass (EHM) and modulations thereof by
Higgs boson interactions are provided by observable measures of pion and kaon
structure, many of which are accessible via generalised parton distributions
(GPDs). Beginning with algebraic GPD Ansaetze, constrained entirely by
hadron-scale $\pi$ and $K$ valence-parton distribution functions (DFs), in
whose forms both EHM and Higgs boson influences are manifest, numerous
illustrations are provided. They include the properties of electromagnetic form
factors, impact parameter space GPDs, gravitational form factors and associated
pressure profiles, and the character and consequences of all-orders evolution.
The analyses predict that mass-squared gravitational form factors are stiffer
than electromagnetic form factors; reveal that $K$ pressure profiles are
tighter than $\pi$ profiles, with both mesons sustaining near-core pressures at
magnitudes similar to that expected at the core of neutron stars; deliver
parameter-free predictions for $\pi$ and $K$ valence, glue, and sea GPDs at the
resolving scale $\zeta=2$GeV; and predict that at this scale the fraction of
meson mass-squared carried by glue and sea combined matches that lodged with
the valence degrees-of-freedom, with a similar statement holding for
mass-squared radii.
| [
{
"created": "Thu, 23 Sep 2021 23:08:30 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Oct 2021 03:22:28 GMT",
"version": "v2"
}
] | 2022-01-26 | [
[
"Raya",
"Khepani",
""
],
[
"Cui",
"Zhu-Fang",
""
],
[
"Chang",
"Lei",
""
],
[
"Morgado",
"Jose-Manuel",
""
],
[
"Roberts",
"Craig D.",
""
],
[
"Rodriguez-Quintero",
"Jose",
""
]
] | Clear windows onto emergent hadron mass (EHM) and modulations thereof by Higgs boson interactions are provided by observable measures of pion and kaon structure, many of which are accessible via generalised parton distributions (GPDs). Beginning with algebraic GPD Ansaetze, constrained entirely by hadron-scale $\pi$ and $K$ valence-parton distribution functions (DFs), in whose forms both EHM and Higgs boson influences are manifest, numerous illustrations are provided. They include the properties of electromagnetic form factors, impact parameter space GPDs, gravitational form factors and associated pressure profiles, and the character and consequences of all-orders evolution. The analyses predict that mass-squared gravitational form factors are stiffer than electromagnetic form factors; reveal that $K$ pressure profiles are tighter than $\pi$ profiles, with both mesons sustaining near-core pressures at magnitudes similar to that expected at the core of neutron stars; deliver parameter-free predictions for $\pi$ and $K$ valence, glue, and sea GPDs at the resolving scale $\zeta=2$GeV; and predict that at this scale the fraction of meson mass-squared carried by glue and sea combined matches that lodged with the valence degrees-of-freedom, with a similar statement holding for mass-squared radii. |
2403.13065 | Di Liu | Quentin Bonnefoy, Jonathan Kley, Di Liu, Alejo N. Rossia, Chang-Yuan
Yao | Aligned Yet Large Dipoles: a SMEFT Study | 35 pages, 6 figures, 7 tables. Comments are welcomed | null | null | DESY-24-033, HU-EP-24/09, LAPTH-011/24, COMETA-2024-004 | hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | We study a non-universal flavor scenario at the level of the Standard Model
Effective Field Theory, according to which the matrix of Wilson coefficients
$c_{uW}$ of an up-type electroweak quark dipole operator is aligned with the
up-type Yukawa coupling. Such an alignment usually follows from the assumption
of Minimal Flavor Violation (MFV), away from which we step by allowing the
entries of $c_{uW}$ to be sizable along the first quark generations. A
particular example, which we refer to as ``inverse hierarchy MFV", features
Wilson coefficients inversely proportional to quark masses, and arises from BSM
models respecting MFV and containing heavy fields that replicate the mass
hierarchy of SM quarks. We then analyze the phenomenology driven by $c_{uW}$ at
colliders and at lower-energy flavor experiments. We show that precision
measurements of the process $pp\rightarrow W h\rightarrow \gamma\gamma\ell\nu$
at FCC-$hh$ could set an upper bound on
$|c_{uW}|\lesssim\mathcal{O}(10^{-2})(\Lambda/{\rm TeV})^{2}$, with $\Lambda$
the cutoff of the effective field theory. This bound is an order of magnitude
stronger than the existing LHC bounds. Moreover, we estimate that $W
h\rightarrow b\bar b \ell\nu$ at HL-LHC could also give competitive bounds. In
the low-energy regime, we consider bounds arising from rare kaon decays, which
turn out to be loose, $|c_{uW}^{11}|<\mathcal{O}(1)(\Lambda/{\rm TeV})^{2}$. We
finally demonstrate that our flavor and operator assumptions can be derived
from a weakly-coupled UV model, which we choose to simultaneously illustrate
the UV origin of inverse hierarchy MFV.
| [
{
"created": "Tue, 19 Mar 2024 18:03:28 GMT",
"version": "v1"
}
] | 2024-03-21 | [
[
"Bonnefoy",
"Quentin",
""
],
[
"Kley",
"Jonathan",
""
],
[
"Liu",
"Di",
""
],
[
"Rossia",
"Alejo N.",
""
],
[
"Yao",
"Chang-Yuan",
""
]
] | We study a non-universal flavor scenario at the level of the Standard Model Effective Field Theory, according to which the matrix of Wilson coefficients $c_{uW}$ of an up-type electroweak quark dipole operator is aligned with the up-type Yukawa coupling. Such an alignment usually follows from the assumption of Minimal Flavor Violation (MFV), away from which we step by allowing the entries of $c_{uW}$ to be sizable along the first quark generations. A particular example, which we refer to as ``inverse hierarchy MFV", features Wilson coefficients inversely proportional to quark masses, and arises from BSM models respecting MFV and containing heavy fields that replicate the mass hierarchy of SM quarks. We then analyze the phenomenology driven by $c_{uW}$ at colliders and at lower-energy flavor experiments. We show that precision measurements of the process $pp\rightarrow W h\rightarrow \gamma\gamma\ell\nu$ at FCC-$hh$ could set an upper bound on $|c_{uW}|\lesssim\mathcal{O}(10^{-2})(\Lambda/{\rm TeV})^{2}$, with $\Lambda$ the cutoff of the effective field theory. This bound is an order of magnitude stronger than the existing LHC bounds. Moreover, we estimate that $W h\rightarrow b\bar b \ell\nu$ at HL-LHC could also give competitive bounds. In the low-energy regime, we consider bounds arising from rare kaon decays, which turn out to be loose, $|c_{uW}^{11}|<\mathcal{O}(1)(\Lambda/{\rm TeV})^{2}$. We finally demonstrate that our flavor and operator assumptions can be derived from a weakly-coupled UV model, which we choose to simultaneously illustrate the UV origin of inverse hierarchy MFV. |
1501.04111 | Daniel Kolodrubetz | Andr\'e H. Hoang, Daniel W. Kolodrubetz, Vicent Mateu, Iain W. Stewart | A Precise Determination of $\alpha_s$ from the C-parameter Distribution | 24 pages, 19 figures | Phys. Rev. D 91, 094018 (2015) | 10.1103/PhysRevD.91.094018 | UWTHPH 2015-1; MIT-CTP 4630; LPN14-128 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a global fit for $\alpha_s(m_Z)$, analyzing the available
C-parameter data measured at center-of-mass energies between $Q=35$ and $207$
GeV. The experimental data is compared to a N$^3$LL$^\prime$ +
$\mathcal{O}(\alpha_s^3)$ + $\Omega_1$ theoretical prediction (up to the
missing 4-loop cusp anomalous dimension), which includes power corrections
coming from a field theoretical nonperturbative soft function. The dominant
hadronic parameter is its first moment $\Omega_1$, which is defined in a scheme
which eliminates the $\mathcal{O}(\Lambda_{\rm QCD})$ renormalon ambiguity. The
resummation region plays a dominant role in the C-parameter spectrum, and in
this region a fit for $\alpha_s(m_Z)$ and $\Omega_1$ is sufficient. We find
$\alpha_s(m_Z)=0.1123\pm 0.0015$ and $\Omega_1=0.421\pm 0.063\,{\rm GeV}$ with
$\chi^2/\rm{dof}=0.988$ for $404$ bins of data. These results agree with the
prediction of universality for $\Omega_1$ between thrust and C-parameter within
1-$\sigma$.
| [
{
"created": "Fri, 16 Jan 2015 21:00:11 GMT",
"version": "v1"
},
{
"created": "Wed, 27 May 2015 14:53:39 GMT",
"version": "v2"
}
] | 2015-05-28 | [
[
"Hoang",
"André H.",
""
],
[
"Kolodrubetz",
"Daniel W.",
""
],
[
"Mateu",
"Vicent",
""
],
[
"Stewart",
"Iain W.",
""
]
] | We present a global fit for $\alpha_s(m_Z)$, analyzing the available C-parameter data measured at center-of-mass energies between $Q=35$ and $207$ GeV. The experimental data is compared to a N$^3$LL$^\prime$ + $\mathcal{O}(\alpha_s^3)$ + $\Omega_1$ theoretical prediction (up to the missing 4-loop cusp anomalous dimension), which includes power corrections coming from a field theoretical nonperturbative soft function. The dominant hadronic parameter is its first moment $\Omega_1$, which is defined in a scheme which eliminates the $\mathcal{O}(\Lambda_{\rm QCD})$ renormalon ambiguity. The resummation region plays a dominant role in the C-parameter spectrum, and in this region a fit for $\alpha_s(m_Z)$ and $\Omega_1$ is sufficient. We find $\alpha_s(m_Z)=0.1123\pm 0.0015$ and $\Omega_1=0.421\pm 0.063\,{\rm GeV}$ with $\chi^2/\rm{dof}=0.988$ for $404$ bins of data. These results agree with the prediction of universality for $\Omega_1$ between thrust and C-parameter within 1-$\sigma$. |
0705.1366 | Daniel Phalen | Daniel J. Phalen and Aaron Pierce | Sfermion Interference in Neutralino Decays at the LHC | 14 pages, 6 figures | Phys.Rev.D76:075002,2007 | 10.1103/PhysRevD.76.075002 | MCTP-07-16 | hep-ph | null | If the two lightest neutralinos of the Minimal Supersymmetric Standard Model
have a mass splitting less than the Z boson mass, interference effects in the
three-body decay chi_2^0 --> chi_1^0 f f can be important. We formulate an
observable that contains information on the nature of the interference: the
ratio BR(chi_2^0 --> chi_1^0 b b) / BR(chi_2^0 --> chi_1^0 l+ l-). This will
give a constraint on the supersymmetry breaking parameters that is
complementary to many techniques already existing in the literature. We present
some ideas on how to perform a simple counting experiment to determine this
ratio.
| [
{
"created": "Wed, 9 May 2007 21:53:46 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Phalen",
"Daniel J.",
""
],
[
"Pierce",
"Aaron",
""
]
] | If the two lightest neutralinos of the Minimal Supersymmetric Standard Model have a mass splitting less than the Z boson mass, interference effects in the three-body decay chi_2^0 --> chi_1^0 f f can be important. We formulate an observable that contains information on the nature of the interference: the ratio BR(chi_2^0 --> chi_1^0 b b) / BR(chi_2^0 --> chi_1^0 l+ l-). This will give a constraint on the supersymmetry breaking parameters that is complementary to many techniques already existing in the literature. We present some ideas on how to perform a simple counting experiment to determine this ratio. |
2011.12230 | Hongxia Huang | Xin Jin, Xuejie Liu, Yaoyao Xue, Hongxia Huang, Jialun Ping | Strange hidden-charm tetraquarks in constituent quark models | 9 pages, 5 figures. arXiv admin note: substantial text overlap with
arXiv:2006.13745 | null | 10.1140/epjc/s10052-021-09916-w | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | Inspired by the newly reported $Z_{cs}(3985)^{-}$ by the BESIII
Collaboration, we systematically investigate the strange hidden-charm
tetraquark systems $cs\bar{c}\bar{u}$ with two structures: meson-meson and
diquark-antidiquark. Two quark models: the chiral quark model (ChQM) and the
quark delocalization color screening model (QDCSM) are used here. Similar
results are obtained in both two quark models. There is no any bound state in
either ChQM or QDCSM, which excludes the molecular state explanation
($D_{s}D^{*}/D_{s}^{*}D/D_{s}^{*}D^{*}$) of the reported $Z_{cs}(3985)^{-}$.
However, the effective potentials for the diquark-antidiquark
$cs\bar{c}\bar{u}$ systems shows the possibility of some resonance states with
mass range of $3916.5\sim 3964.6$ MeV for $IJ^{P}=\frac{1}{2} 0^{+}$,
$4008.8\sim 4091.2$ MeV for $IJ^{P}=\frac{1}{2} 1^{+}$, $4246.8\sim 4418.1$ MeV
for $IJ^{P}=\frac{1}{2} 2^{+}$. So the observed $Z_{cs}(3985)^{-}$ state is
possible to be explained as a compact resonance state composed of
$cs\bar{c}\bar{u}$ with $IJ^{P}=\frac{1}{2} 0^{+}$ or $IJ^{P}=\frac{1}{2}
1^{+}$. The study of the scattering process of corresponding open channels is
under way to check this conclusion.
| [
{
"created": "Mon, 23 Nov 2020 14:57:15 GMT",
"version": "v1"
}
] | 2022-01-05 | [
[
"Jin",
"Xin",
""
],
[
"Liu",
"Xuejie",
""
],
[
"Xue",
"Yaoyao",
""
],
[
"Huang",
"Hongxia",
""
],
[
"Ping",
"Jialun",
""
]
] | Inspired by the newly reported $Z_{cs}(3985)^{-}$ by the BESIII Collaboration, we systematically investigate the strange hidden-charm tetraquark systems $cs\bar{c}\bar{u}$ with two structures: meson-meson and diquark-antidiquark. Two quark models: the chiral quark model (ChQM) and the quark delocalization color screening model (QDCSM) are used here. Similar results are obtained in both two quark models. There is no any bound state in either ChQM or QDCSM, which excludes the molecular state explanation ($D_{s}D^{*}/D_{s}^{*}D/D_{s}^{*}D^{*}$) of the reported $Z_{cs}(3985)^{-}$. However, the effective potentials for the diquark-antidiquark $cs\bar{c}\bar{u}$ systems shows the possibility of some resonance states with mass range of $3916.5\sim 3964.6$ MeV for $IJ^{P}=\frac{1}{2} 0^{+}$, $4008.8\sim 4091.2$ MeV for $IJ^{P}=\frac{1}{2} 1^{+}$, $4246.8\sim 4418.1$ MeV for $IJ^{P}=\frac{1}{2} 2^{+}$. So the observed $Z_{cs}(3985)^{-}$ state is possible to be explained as a compact resonance state composed of $cs\bar{c}\bar{u}$ with $IJ^{P}=\frac{1}{2} 0^{+}$ or $IJ^{P}=\frac{1}{2} 1^{+}$. The study of the scattering process of corresponding open channels is under way to check this conclusion. |
2211.09575 | Greg Jackson | Greg Jackson | Shedding light on thermal photon and dilepton production | 8 pages, 4 figures. Contribution to proceedings of Confinement XV
(1-6 August 2022, Stavanger, Norway) | null | 10.1051/epjconf/202227405014 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Electromagnetic radiation from the quark-gluon plasma (QGP) is an important
observable to be considered in heavy ion collision experiments. I will provide
an update on recent advancements from perturbation theory and quenched lattice
simulations. The resummed next-to-leading order (NLO) emission rate has
recently been decomposed into transverse and longitudinal components, and
extended to non-zero baryon chemical potential. The associated spectral
function has also been tested against the Euclidean correlator, for
continuum-extrapolated lattice data (at $\mu_{\rm B}=0$).
| [
{
"created": "Thu, 17 Nov 2022 15:00:58 GMT",
"version": "v1"
}
] | 2023-01-11 | [
[
"Jackson",
"Greg",
""
]
] | Electromagnetic radiation from the quark-gluon plasma (QGP) is an important observable to be considered in heavy ion collision experiments. I will provide an update on recent advancements from perturbation theory and quenched lattice simulations. The resummed next-to-leading order (NLO) emission rate has recently been decomposed into transverse and longitudinal components, and extended to non-zero baryon chemical potential. The associated spectral function has also been tested against the Euclidean correlator, for continuum-extrapolated lattice data (at $\mu_{\rm B}=0$). |
hep-ph/0310316 | Sandhya Choubey | Sandhya Choubey, Probir Roy | Testing whether muon neutrino flavor mixing is maximal | Some revision has been made in the experimental discussions with two
new figures replacing the old ones and a clarification of the accuracy of the
perturbative result has been included. This version will be published in
Physical Review Letters. Title changed as asked by the editors of Physical
Review Letters | Phys.Rev.Lett. 93 (2004) 021803 | 10.1103/PhysRevLett.93.021803 | TIFR/TH/03-20, SISSA 95/2003/EP | hep-ph hep-ex | null | The small difference between the survival probabilities of muon neutrino and
antineutrino beams, traveling through earth matter in a long baseline
experiment such as MINOS, is shown to be an important measure of any possible
deviation from maximality in the flavor mixing of those states.
| [
{
"created": "Tue, 28 Oct 2003 17:19:14 GMT",
"version": "v1"
},
{
"created": "Wed, 19 May 2004 08:59:18 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Choubey",
"Sandhya",
""
],
[
"Roy",
"Probir",
""
]
] | The small difference between the survival probabilities of muon neutrino and antineutrino beams, traveling through earth matter in a long baseline experiment such as MINOS, is shown to be an important measure of any possible deviation from maximality in the flavor mixing of those states. |
hep-ph/0608089 | Sandhya Choubey | Biswajoy Brahmachari, Sandhya Choubey | Modified Zee mass matrix with zero-sum condition | Version to appear in Physics Letters B. (17 pages) | Phys.Lett.B642:495-502,2006 | 10.1016/j.physletb.2006.10.007 | VEC/PHYSICS/P/2/2005-2006, OUTP-0615P | hep-ph | null | We modify the Zee mass matrix by adding a real one parameter perturbation
which is purely diagonal and trace-less. We show that in this way we can
explain both solar and atmospheric neutrino oscillation data. There is a
correlation between the deviation from strict maximality of $|U_{\mu 3}|=
1/\sqrt{2}$, with the emergence of a small but non-zero $U_{e3}$. We calculate
how big a value can $U_{e3}$ get when we restrict ourselves within the allowed
regions of solar and atmospheric neutrino masses and mixing angles. We also
discuss the impact of a $S_2$ permutation symmetry on our mass matrix and show
how a small $U_{e3} \ne 0$ can emerge when this $S_2$ permutation symmetry
between the second and the third generation is broken.
| [
{
"created": "Tue, 8 Aug 2006 11:56:36 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Oct 2006 16:51:16 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Brahmachari",
"Biswajoy",
""
],
[
"Choubey",
"Sandhya",
""
]
] | We modify the Zee mass matrix by adding a real one parameter perturbation which is purely diagonal and trace-less. We show that in this way we can explain both solar and atmospheric neutrino oscillation data. There is a correlation between the deviation from strict maximality of $|U_{\mu 3}|= 1/\sqrt{2}$, with the emergence of a small but non-zero $U_{e3}$. We calculate how big a value can $U_{e3}$ get when we restrict ourselves within the allowed regions of solar and atmospheric neutrino masses and mixing angles. We also discuss the impact of a $S_2$ permutation symmetry on our mass matrix and show how a small $U_{e3} \ne 0$ can emerge when this $S_2$ permutation symmetry between the second and the third generation is broken. |
2306.02530 | Xiaojian Du | Xiaojian Du | Heavy quark drag and diffusion coefficients in the pre-hydrodynamic QCD
plasma | 9 pages, 8 figures | null | null | null | hep-ph nucl-th | http://creativecommons.org/licenses/by/4.0/ | Kinetic and chemical equilibrations play important roles in the formation of
the quark-gluon plasma (QGP) in relativistic heavy-ion collisions (HICs). These
processes further influence the production of hard and electromagnetic probes
in HICs, in particular, the thermalization of heavy quarks, which are produced
at an extremely early time before the formation of the QGP. We calculate the
drag and diffusion coefficients of heavy quarks in the pre-hydrodynamic quantum
chromodynamic (QCD) plasma with the state-of-the-art QCD effective kinetic
theory (EKT) solver. We present the time, momentum, and angular dependencies of
these coefficients for gluon and quark contributions separately, showing the
effects of isotropization and chemical equilibration from the QCD plasma. We
also provide a simple formula to estimate the heavy quark drag and diffusion
coefficients, as well as its energy loss, within the pre-hydrodynamic plasma at
different coupling strengths based on the attractor theory. We then discuss the
validity of these estimations with leading-order calculations and
leading-logarithmic rescaling factors.
| [
{
"created": "Mon, 5 Jun 2023 01:36:22 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Dec 2023 01:07:49 GMT",
"version": "v2"
}
] | 2023-12-08 | [
[
"Du",
"Xiaojian",
""
]
] | Kinetic and chemical equilibrations play important roles in the formation of the quark-gluon plasma (QGP) in relativistic heavy-ion collisions (HICs). These processes further influence the production of hard and electromagnetic probes in HICs, in particular, the thermalization of heavy quarks, which are produced at an extremely early time before the formation of the QGP. We calculate the drag and diffusion coefficients of heavy quarks in the pre-hydrodynamic quantum chromodynamic (QCD) plasma with the state-of-the-art QCD effective kinetic theory (EKT) solver. We present the time, momentum, and angular dependencies of these coefficients for gluon and quark contributions separately, showing the effects of isotropization and chemical equilibration from the QCD plasma. We also provide a simple formula to estimate the heavy quark drag and diffusion coefficients, as well as its energy loss, within the pre-hydrodynamic plasma at different coupling strengths based on the attractor theory. We then discuss the validity of these estimations with leading-order calculations and leading-logarithmic rescaling factors. |
1509.02083 | Ivo de Medeiros Varzielas | A. E. C\'arcamo Hern\'andez, I. de Medeiros Varzielas and E.
Schumacher | Fermion and scalar phenomenology of a 2-Higgs doublet model with $S_3$ | 22 pages, 7 figures, v2: version accepted in PRD | Phys. Rev. D 93, 016003 (2016) | 10.1103/PhysRevD.93.016003 | DO-TH 15/12 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a 2-Higgs doublet model where the symmetry is extended by
$S_{3}\otimes Z_{3}\otimes Z_{3}^{\prime }\otimes Z_{14}$ and the field content
is enlarged by extra $SU(2)_{L}$ singlet scalar fields. $S_3$ makes the model
predictive and leads to viable fermion masses and mixing. The observed
hierarchy of the quark masses arises from the $Z_{3}^{\prime }$ and $Z_{14}$
symmetries. The light neutrino masses are generated through a type I seesaw
mechanism with two heavy Majorana neutrinos. In the lepton sector we obtain
mixing angles that are nearly tri-bi-maximal, in an excellent agreement with
the observed lepton parameters. The vacuum expectation values required for the
model are naturally obtained from the scalar potential, and we analyze the
scalar sector properties further constraining the model through the $\gamma
\gamma$ decay channel and the $T$ and $S$ parameters.
| [
{
"created": "Mon, 7 Sep 2015 15:42:56 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Jul 2017 12:54:50 GMT",
"version": "v2"
}
] | 2017-07-21 | [
[
"Hernández",
"A. E. Cárcamo",
""
],
[
"Varzielas",
"I. de Medeiros",
""
],
[
"Schumacher",
"E.",
""
]
] | We propose a 2-Higgs doublet model where the symmetry is extended by $S_{3}\otimes Z_{3}\otimes Z_{3}^{\prime }\otimes Z_{14}$ and the field content is enlarged by extra $SU(2)_{L}$ singlet scalar fields. $S_3$ makes the model predictive and leads to viable fermion masses and mixing. The observed hierarchy of the quark masses arises from the $Z_{3}^{\prime }$ and $Z_{14}$ symmetries. The light neutrino masses are generated through a type I seesaw mechanism with two heavy Majorana neutrinos. In the lepton sector we obtain mixing angles that are nearly tri-bi-maximal, in an excellent agreement with the observed lepton parameters. The vacuum expectation values required for the model are naturally obtained from the scalar potential, and we analyze the scalar sector properties further constraining the model through the $\gamma \gamma$ decay channel and the $T$ and $S$ parameters. |
0710.4947 | Kenneth Long | The ISS Physics Working Group | Physics at a future Neutrino Factory and super-beam facility | 370 pages, 121 postscript figures | Rept.Prog.Phys.72:106201,2009 | 10.1088/0034-4885/72/10/106201 | RAL-TR-2007-019 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The conclusions of the Physics Working Group of the international scoping
study of a future Neutrino Factory and super-beam facility (the ISS) are
presented. The ISS was carried by the international community between NuFact05,
(the 7th International Workshop on Neutrino Factories and Superbeams,
Laboratori Nazionali di Frascati, Rome, June 21-26, 2005) and NuFact06 (Ivine,
California, 24{30 August 2006). The physics case for an extensive experimental
programme to understand the properties of the neutrino is presented and the
role of high-precision measurements of neutrino oscillations within this
programme is discussed in detail. The performance of second generation
super-beam experiments, beta-beam facilities, and the Neutrino Factory are
evaluated and a quantitative comparison of the discovery potential of the three
classes of facility is presented. High-precision studies of the properties of
the muon are complementary to the study of neutrino oscillations. The Neutrino
Factory has the potential to provide extremely intense muon beams and the
physics potential of such beams is discussed in the final section of the
report.
| [
{
"created": "Thu, 25 Oct 2007 19:23:59 GMT",
"version": "v1"
},
{
"created": "Fri, 23 Nov 2007 19:16:11 GMT",
"version": "v2"
},
{
"created": "Sat, 23 Oct 2010 07:18:50 GMT",
"version": "v3"
}
] | 2012-08-27 | [
[
"The ISS Physics Working Group",
"",
""
]
] | The conclusions of the Physics Working Group of the international scoping study of a future Neutrino Factory and super-beam facility (the ISS) are presented. The ISS was carried by the international community between NuFact05, (the 7th International Workshop on Neutrino Factories and Superbeams, Laboratori Nazionali di Frascati, Rome, June 21-26, 2005) and NuFact06 (Ivine, California, 24{30 August 2006). The physics case for an extensive experimental programme to understand the properties of the neutrino is presented and the role of high-precision measurements of neutrino oscillations within this programme is discussed in detail. The performance of second generation super-beam experiments, beta-beam facilities, and the Neutrino Factory are evaluated and a quantitative comparison of the discovery potential of the three classes of facility is presented. High-precision studies of the properties of the muon are complementary to the study of neutrino oscillations. The Neutrino Factory has the potential to provide extremely intense muon beams and the physics potential of such beams is discussed in the final section of the report. |
1708.04254 | Adith Ramamurti | Adith Ramamurti, Edward Shuryak | The Role of QCD Monopoles in Jet Quenching | 17 pages, 15 figures | Phys. Rev. D 97, 016010 (2018) | 10.1103/PhysRevD.97.016010 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | QCD monopoles are magnetically charged quasiparticles whose Bose-Einstein
condensation (BEC) at $T<T_c$ creates electric confinement and flux tubes. The
"magnetic scenario" of QCD proposes that scattering on the non-condensed
component of the monopole ensemble at $T>T_c$ is responsible for the unusual
kinetic properties of QGP. In this paper, we study the contribution of the
monopoles to jet quenching phenomenon, using the BDMPS framework and
hydrodynamic backgrounds. In the lowest order for cross sections, we calculate
the nuclear modification factor, $R_\text{AA},$ and azimuthal anisotropy,
$v_2$, of jets, as well as the dijet asymmetry, $A_j$, and compare those to the
available data. We find relatively good agreement with experiment when using
realistic hydrodynamic backgrounds. In addition, we find that event-by-event
fluctuations are not necessary to reproduce $R_\text{AA}$ and $v_2$ data, but
play a role in $A_j$. Since the monopole-induced effects are maximal at
$T\approx T_c$, we predict that their role should be significantly larger,
relative to quarks and gluons, at lower RHIC energies.
| [
{
"created": "Mon, 14 Aug 2017 18:06:14 GMT",
"version": "v1"
}
] | 2018-01-24 | [
[
"Ramamurti",
"Adith",
""
],
[
"Shuryak",
"Edward",
""
]
] | QCD monopoles are magnetically charged quasiparticles whose Bose-Einstein condensation (BEC) at $T<T_c$ creates electric confinement and flux tubes. The "magnetic scenario" of QCD proposes that scattering on the non-condensed component of the monopole ensemble at $T>T_c$ is responsible for the unusual kinetic properties of QGP. In this paper, we study the contribution of the monopoles to jet quenching phenomenon, using the BDMPS framework and hydrodynamic backgrounds. In the lowest order for cross sections, we calculate the nuclear modification factor, $R_\text{AA},$ and azimuthal anisotropy, $v_2$, of jets, as well as the dijet asymmetry, $A_j$, and compare those to the available data. We find relatively good agreement with experiment when using realistic hydrodynamic backgrounds. In addition, we find that event-by-event fluctuations are not necessary to reproduce $R_\text{AA}$ and $v_2$ data, but play a role in $A_j$. Since the monopole-induced effects are maximal at $T\approx T_c$, we predict that their role should be significantly larger, relative to quarks and gluons, at lower RHIC energies. |
2106.06252 | Christian Ospelkaus | Juan M. Cornejo, Ralf Lehnert, Malte Niemann, Johannes Mielke, Teresa
Meiners, Amado Bautista-Salvador, Marius Schulte, Diana Nitzschke, Matthias
J. Borchert, Klemens Hammerer, Stefan Ulmer and Christian Ospelkaus | Quantum logic inspired techniques for spacetime-symmetry tests with
(anti-)protons | Accepted for publication in New Journal of Physics | null | 10.1088/1367-2630/ac136e | null | hep-ph physics.atom-ph quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Cosmological observations as well as theoretical approaches to physics beyond
the Standard Model provide strong motivations for experimental tests of
fundamental symmetries, such as CPT invariance. In this context, the
availability of cold baryonic antimatter at CERN has opened an avenue for
ultrahigh-precision comparisons of protons and antiprotons in Penning traps.
This work discusses an experimental method inspired by quantum logic techniques
that will improve particle localization and readout speed in such experiments.
The method allows for sympathetic cooling of the (anti-)proton to its
quantum-mechanical ground state as well as the readout of its spin alignment,
replacing the commonly used continuous Stern-Gerlach effect. Both of these
features are achieved through coupling to a laser-cooled `logic' ion co-trapped
in a double-well potential. This technique will boost the measurement sampling
rate and will thus provide results with lower statistical uncertainty,
contributing to stringent searches for time dependent variations in the data.
Such measurements ultimately yield extremely high sensitivities to CPT
violating coefficients acting on baryons in the Standard-Model Extension, will
allow the exploration of previously unmeasured types of symmetry violations,
and will enable antimatter-based axion-like dark matter searches with improved
mass resolution.
| [
{
"created": "Fri, 11 Jun 2021 09:06:15 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Jul 2021 06:27:49 GMT",
"version": "v2"
}
] | 2021-07-14 | [
[
"Cornejo",
"Juan M.",
""
],
[
"Lehnert",
"Ralf",
""
],
[
"Niemann",
"Malte",
""
],
[
"Mielke",
"Johannes",
""
],
[
"Meiners",
"Teresa",
""
],
[
"Bautista-Salvador",
"Amado",
""
],
[
"Schulte",
"Marius",
""
],
[
"Nitzschke",
"Diana",
""
],
[
"Borchert",
"Matthias J.",
""
],
[
"Hammerer",
"Klemens",
""
],
[
"Ulmer",
"Stefan",
""
],
[
"Ospelkaus",
"Christian",
""
]
] | Cosmological observations as well as theoretical approaches to physics beyond the Standard Model provide strong motivations for experimental tests of fundamental symmetries, such as CPT invariance. In this context, the availability of cold baryonic antimatter at CERN has opened an avenue for ultrahigh-precision comparisons of protons and antiprotons in Penning traps. This work discusses an experimental method inspired by quantum logic techniques that will improve particle localization and readout speed in such experiments. The method allows for sympathetic cooling of the (anti-)proton to its quantum-mechanical ground state as well as the readout of its spin alignment, replacing the commonly used continuous Stern-Gerlach effect. Both of these features are achieved through coupling to a laser-cooled `logic' ion co-trapped in a double-well potential. This technique will boost the measurement sampling rate and will thus provide results with lower statistical uncertainty, contributing to stringent searches for time dependent variations in the data. Such measurements ultimately yield extremely high sensitivities to CPT violating coefficients acting on baryons in the Standard-Model Extension, will allow the exploration of previously unmeasured types of symmetry violations, and will enable antimatter-based axion-like dark matter searches with improved mass resolution. |
1512.00516 | Gregory Soyez | Mrinal Dasgupta, Lais Schunk and Gregory Soyez | Jet shapes for boosted jet two-prong decays from first-principles | 59 pages, 15 figures | null | 10.1007/JHEP04(2016)166 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Several boosted jet techniques use jet shape variables to discriminate the
multi-pronged signal from Quantum Chromodynamics backgrounds. In this paper, we
provide a first-principles study of an important class of jet shapes all of
which put a constraint on the subjet mass: the mass-drop parameter ($\mu^2$),
the $N$-subjettiness ratio ($\tau_{21}^{(\beta=2)}$) and energy correlation
functions ($C_2^{(\beta=2)}$ or $D_2^{(\beta=2)}$). We provide analytic results
both for QCD background jets as well as for signal processes. We further study
the situation where cuts on these variables are applied recursively with
Cambridge-Aachen de-clustering of the original jet. We also explore the effect
of the choice of axis for $N$-subjettiness and jet de-clustering. Our results
bring substantial new insight into the nature, gain and relative performance of
each of these methods, which we expect will influence their future application
for boosted object searches.
| [
{
"created": "Tue, 1 Dec 2015 23:20:34 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Sep 2016 06:50:19 GMT",
"version": "v2"
}
] | 2016-09-23 | [
[
"Dasgupta",
"Mrinal",
""
],
[
"Schunk",
"Lais",
""
],
[
"Soyez",
"Gregory",
""
]
] | Several boosted jet techniques use jet shape variables to discriminate the multi-pronged signal from Quantum Chromodynamics backgrounds. In this paper, we provide a first-principles study of an important class of jet shapes all of which put a constraint on the subjet mass: the mass-drop parameter ($\mu^2$), the $N$-subjettiness ratio ($\tau_{21}^{(\beta=2)}$) and energy correlation functions ($C_2^{(\beta=2)}$ or $D_2^{(\beta=2)}$). We provide analytic results both for QCD background jets as well as for signal processes. We further study the situation where cuts on these variables are applied recursively with Cambridge-Aachen de-clustering of the original jet. We also explore the effect of the choice of axis for $N$-subjettiness and jet de-clustering. Our results bring substantial new insight into the nature, gain and relative performance of each of these methods, which we expect will influence their future application for boosted object searches. |
1506.06141 | Christopher Verhaaren | David Curtin and Christopher B. Verhaaren | Discovering Uncolored Naturalness in Exotic Higgs Decays | 31 pages + references, 10 figures. Extended sensitivity projections
to glueball masses below 12 GeV, added model-independent presentation of
limits, improved modeling of displaced vertex triggering and reconstruction.
Conclusions unchanged | JHEP 1512 (2015) 72 | 10.1007/JHEP12(2015)072 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Solutions to the hierarchy problem usually require top partners. In standard
SUSY or composite Higgs theories, the partners carry SM color and are becoming
increasingly constrained by LHC searches. However, theories like Folded SUSY
(FS), Twin Higgs (TH) and Quirky Little Higgs (QLH) introduce uncolored top
partners, which can be SM singlets or carry electroweak charge. Their small
production cross section left doubt as to whether the LHC can effectively probe
such scenarios. Typically, these partners are charged under their own mirror
color gauge group. In FS and QLH, the absence of light mirror matter allows
glueballs to form at the bottom of the mirror spectrum. This is also the case
in some TH realizations. The Higgs can decay to these mirror glueballs, with
the glueballs decaying into SM particles with potentially observable lifetimes.
We undertake the first detailed study of this glueball signature and
quantitatively demonstrate the discovery potential of uncolored naturalness via
exotic Higgs decays at the LHC and a potential future 100 TeV collider. Our
findings indicate that mirror glueballs are the smoking gun signature of
natural FS and QLH type theories, in analogy to tree-level Higgs coupling
shifts for the TH. We show that glueball masses in the $\sim$ 10-60 GeV mass
range are theoretically preferred. Careful treatment of lifetime,
mirror-hadronization and nonperturbative uncertainties is required to perform
meaningful collider studies. We outline several new search strategies for
exotic Higgs decays of the form $h\to XX \to 4f$ at the LHC, with $X$ having
lifetimes in the $10 \mu m$ to $km$ range. We find that FS stops can be probed
with masses up to 600 (1100) GeV at the LHC with 300 (3000) /fb of data, and TH
top partners could be accessible with masses up to 900 (1500) GeV. This makes
exotic Higgs decays the prime discovery channel for uncolored naturalness at
the LHC.
| [
{
"created": "Fri, 19 Jun 2015 20:01:27 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Dec 2015 20:52:12 GMT",
"version": "v2"
},
{
"created": "Tue, 26 Apr 2016 15:02:11 GMT",
"version": "v3"
}
] | 2016-04-27 | [
[
"Curtin",
"David",
""
],
[
"Verhaaren",
"Christopher B.",
""
]
] | Solutions to the hierarchy problem usually require top partners. In standard SUSY or composite Higgs theories, the partners carry SM color and are becoming increasingly constrained by LHC searches. However, theories like Folded SUSY (FS), Twin Higgs (TH) and Quirky Little Higgs (QLH) introduce uncolored top partners, which can be SM singlets or carry electroweak charge. Their small production cross section left doubt as to whether the LHC can effectively probe such scenarios. Typically, these partners are charged under their own mirror color gauge group. In FS and QLH, the absence of light mirror matter allows glueballs to form at the bottom of the mirror spectrum. This is also the case in some TH realizations. The Higgs can decay to these mirror glueballs, with the glueballs decaying into SM particles with potentially observable lifetimes. We undertake the first detailed study of this glueball signature and quantitatively demonstrate the discovery potential of uncolored naturalness via exotic Higgs decays at the LHC and a potential future 100 TeV collider. Our findings indicate that mirror glueballs are the smoking gun signature of natural FS and QLH type theories, in analogy to tree-level Higgs coupling shifts for the TH. We show that glueball masses in the $\sim$ 10-60 GeV mass range are theoretically preferred. Careful treatment of lifetime, mirror-hadronization and nonperturbative uncertainties is required to perform meaningful collider studies. We outline several new search strategies for exotic Higgs decays of the form $h\to XX \to 4f$ at the LHC, with $X$ having lifetimes in the $10 \mu m$ to $km$ range. We find that FS stops can be probed with masses up to 600 (1100) GeV at the LHC with 300 (3000) /fb of data, and TH top partners could be accessible with masses up to 900 (1500) GeV. This makes exotic Higgs decays the prime discovery channel for uncolored naturalness at the LHC. |
hep-ph/9612246 | Alexander Bel'kov | A.A.Bel'kov, M.Dillig | Spin-3/2 fields in the heavy-baryon effective theory | LaTeX, 9 pages, no figures | null | null | JINR E2-96-432, FAU-TP3-96/5 | hep-ph | null | In the framework of the path integral approach we develop the velocity
component formalism for spin-1/2 and -3/2 baryons coupled with pseudoscalar
mesons in the limit of heavy baryons.
Starting from the most general chiral meson-baryon lagrangian including the
invariance of spin-3/2 fields under point transformation we detail various
problems in integrating out the heavy velocity components in the baryon fields
and derive the effective lagrangian for the light components up to
O(1/M_{baryon}).
| [
{
"created": "Wed, 4 Dec 1996 10:13:02 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Bel'kov",
"A. A.",
""
],
[
"Dillig",
"M.",
""
]
] | In the framework of the path integral approach we develop the velocity component formalism for spin-1/2 and -3/2 baryons coupled with pseudoscalar mesons in the limit of heavy baryons. Starting from the most general chiral meson-baryon lagrangian including the invariance of spin-3/2 fields under point transformation we detail various problems in integrating out the heavy velocity components in the baryon fields and derive the effective lagrangian for the light components up to O(1/M_{baryon}). |
2310.17508 | Alexei P. Martynenko | V.I. Korobov, A.V. Eskin, A.P. Martynenko, F.A. Martynenko | Energy levels of mesonic helium in quantum electrodynamics | 12 pages, 6 figures | null | null | null | hep-ph physics.atom-ph | http://creativecommons.org/licenses/by/4.0/ | On the basis of variational method we study energy levels of pionic helium
$(\pi-e-He)$ and kaonic helium $(K-e-He)$ with an electron in ground state and
a meson in excited state with principal and orbital quantum numbers $n\sim
l+1\sim 20$. Variational wave functions are taken in the Gaussian form. Matrix
elements of the basic Hamiltonian and corrections to vacuum polarization and
relativism are calculated analytically in a closed form. We calculate some
bound state energies and transition frequencies which can be studied in the
experiment.
| [
{
"created": "Thu, 26 Oct 2023 16:01:33 GMT",
"version": "v1"
},
{
"created": "Sun, 19 Nov 2023 12:00:40 GMT",
"version": "v2"
}
] | 2023-11-21 | [
[
"Korobov",
"V. I.",
""
],
[
"Eskin",
"A. V.",
""
],
[
"Martynenko",
"A. P.",
""
],
[
"Martynenko",
"F. A.",
""
]
] | On the basis of variational method we study energy levels of pionic helium $(\pi-e-He)$ and kaonic helium $(K-e-He)$ with an electron in ground state and a meson in excited state with principal and orbital quantum numbers $n\sim l+1\sim 20$. Variational wave functions are taken in the Gaussian form. Matrix elements of the basic Hamiltonian and corrections to vacuum polarization and relativism are calculated analytically in a closed form. We calculate some bound state energies and transition frequencies which can be studied in the experiment. |
hep-ph/0603154 | Singh N.Nimai | N.Nimai Singh, Monisa Rajkhowa and Abhijit Borah | Lowering solar mixing angle in inverted hierarchy without charged lepton
corrections | 10 pages, two figures. Accepted for publication in Journal of Physics
G:Nuclear and Particle Physics | J.Phys.G34:345-352,2007 | 10.1088/0954-3899/34/2/013 | hep-ph/0603154 | hep-ph | null | In the present work, the inverted hierarchical neutrino mass model which is
characterised by opposite CP parity in the first two mass eigenvalues
$(m_1,-m_2,m_3)$, is studied in order to lower the predicted value of solar
mixing angle $\tan^2\theta_{12}$, from the tri-bimaximal mixing (TBM), without
sacrificing the conditions of maximal atmospheric mixing angle and zero reactor
angle. The present attempt is different from the earlier approach where the
correction from the charged lepton mass matrix is included in the leptonic
mixing matrix to lower the prediction on solar mixing angle. The lowering of
the solar mixing angle without charged lepton correction, can be obtained
through the variation of the input value of a flavour twister term present in
the texture of neutrino mass matrix having a 2-3 symmetry. The present analysis
agrees with the latest experimental bounds on neutrino mass parameters and also
represents an important result on the survival of the inverted hierarchical
neutrino mass models having opposite CP parity in the first two eigenvalues.
| [
{
"created": "Tue, 21 Mar 2006 06:57:39 GMT",
"version": "v1"
},
{
"created": "Fri, 8 Dec 2006 01:53:36 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Singh",
"N. Nimai",
""
],
[
"Rajkhowa",
"Monisa",
""
],
[
"Borah",
"Abhijit",
""
]
] | In the present work, the inverted hierarchical neutrino mass model which is characterised by opposite CP parity in the first two mass eigenvalues $(m_1,-m_2,m_3)$, is studied in order to lower the predicted value of solar mixing angle $\tan^2\theta_{12}$, from the tri-bimaximal mixing (TBM), without sacrificing the conditions of maximal atmospheric mixing angle and zero reactor angle. The present attempt is different from the earlier approach where the correction from the charged lepton mass matrix is included in the leptonic mixing matrix to lower the prediction on solar mixing angle. The lowering of the solar mixing angle without charged lepton correction, can be obtained through the variation of the input value of a flavour twister term present in the texture of neutrino mass matrix having a 2-3 symmetry. The present analysis agrees with the latest experimental bounds on neutrino mass parameters and also represents an important result on the survival of the inverted hierarchical neutrino mass models having opposite CP parity in the first two eigenvalues. |
1605.00191 | XiaoHu Mo | X.H. Mo | On uplimit of accurate measurement of tau mass | 13 pages, 2 figures | Mod. Phys. Lett. A, Vol. 31, No. 35 (2016) 1650196 | 10.1142/S0217732316501960 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Tau lepton as one of three elementary leptons in nature, the measurement of
its mass has ever been performed since its discovery. The present relative
accuracy is already at the level of better than 10 to minus 4 and more effects
are still made in order to increase the accuracy further. However, the analysis
of available techniques for and expectable luminosity from e+e- collider
indicates that the precision uplimit of tau mass is almost reached, which means
that brand new approaches should be looked for if the great improvement is
yearned for.
| [
{
"created": "Sun, 1 May 2016 00:43:27 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Oct 2016 00:01:43 GMT",
"version": "v2"
}
] | 2016-10-31 | [
[
"Mo",
"X. H.",
""
]
] | Tau lepton as one of three elementary leptons in nature, the measurement of its mass has ever been performed since its discovery. The present relative accuracy is already at the level of better than 10 to minus 4 and more effects are still made in order to increase the accuracy further. However, the analysis of available techniques for and expectable luminosity from e+e- collider indicates that the precision uplimit of tau mass is almost reached, which means that brand new approaches should be looked for if the great improvement is yearned for. |
hep-ph/9907232 | Giuseppe Nardulli | M. Ladisa, G. Nardulli, S. Stramaglia | Cottingham formula and the pion electromagnetic mass difference at
finite temperature | 11 pages, 1 figure | Phys.Lett. B465 (1999) 241-248 | 10.1016/S0370-2693(99)01055-2 | BARI-TH/99-348 | hep-ph | null | We generalize the Cottingham formula at finite (T\neq 0) temperature by using
the imaginary time formalism. The Cottingham formula gives the theoretical
framework to compute the electromagnetic mass differences of the hadrons using
a dispersion relation approach. It can be also used in other contexts, such as
non leptonic weak decays, and its generalization to finite temperature might be
useful in evaluating thermal effects in these processes. As an application we
compute the \pi^+-\pi^0 mass difference at T\neq 0; at small T we reproduce the
behaviour found by other authors: \delta m^2(T)= \delta
m^2(0)+\mathcal{O}(\alpha T^2), while for moderate T, near the deconfinement
temperature, we observe deviations from this behaviour.
| [
{
"created": "Mon, 5 Jul 1999 14:34:53 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Ladisa",
"M.",
""
],
[
"Nardulli",
"G.",
""
],
[
"Stramaglia",
"S.",
""
]
] | We generalize the Cottingham formula at finite (T\neq 0) temperature by using the imaginary time formalism. The Cottingham formula gives the theoretical framework to compute the electromagnetic mass differences of the hadrons using a dispersion relation approach. It can be also used in other contexts, such as non leptonic weak decays, and its generalization to finite temperature might be useful in evaluating thermal effects in these processes. As an application we compute the \pi^+-\pi^0 mass difference at T\neq 0; at small T we reproduce the behaviour found by other authors: \delta m^2(T)= \delta m^2(0)+\mathcal{O}(\alpha T^2), while for moderate T, near the deconfinement temperature, we observe deviations from this behaviour. |
hep-ph/0210045 | Kornelija Passek-Kumericki | Peter Kroll and Kornelija Passek-Kumericki | The two-gluon components of the eta and eta' mesons to leading-twist
accuracy | 20 pages(revtex4 two-column format), 14 figures; a typo corrected;
version published in Phys. Rev. D | Phys.Rev.D67:054017,2003 | 10.1103/PhysRevD.67.054017 | WU B 02-02 | hep-ph | null | We critically reexamine the formalism for treating the leading-twist
contributions from the two-gluon Fock components occurring in hard processes
that involve eta and eta' mesons and establish a consistent set of conventions
for the definition of the gluon distribution amplitudes, the anomalous
dimensions as well as the projector of a two-gluon state onto an eta or eta'
state. We calculate the eta, eta'--photon transition form factor to order
alpha_s and show the cancellation of the collinear and UV singularities
explicitly. An estimate of the lowest Gegenbauer coefficients of the gluon and
quark distribution amplitudes is obtained from a fit to the eta, eta'--photon
transition form factor data. In order to elucidate the role of the two-gluon
Fock component further, we analyze electroproduction of eta, eta' mesons and
the g*g* eta (eta') vertex.
| [
{
"created": "Wed, 2 Oct 2002 22:22:37 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Jan 2003 15:03:02 GMT",
"version": "v2"
},
{
"created": "Fri, 11 Apr 2003 13:20:23 GMT",
"version": "v3"
}
] | 2010-11-19 | [
[
"Kroll",
"Peter",
""
],
[
"Passek-Kumericki",
"Kornelija",
""
]
] | We critically reexamine the formalism for treating the leading-twist contributions from the two-gluon Fock components occurring in hard processes that involve eta and eta' mesons and establish a consistent set of conventions for the definition of the gluon distribution amplitudes, the anomalous dimensions as well as the projector of a two-gluon state onto an eta or eta' state. We calculate the eta, eta'--photon transition form factor to order alpha_s and show the cancellation of the collinear and UV singularities explicitly. An estimate of the lowest Gegenbauer coefficients of the gluon and quark distribution amplitudes is obtained from a fit to the eta, eta'--photon transition form factor data. In order to elucidate the role of the two-gluon Fock component further, we analyze electroproduction of eta, eta' mesons and the g*g* eta (eta') vertex. |
hep-ph/9311228 | null | Marco Aurelio Diaz | The b -> s gamma decay in supergravity with radiatively electroweak
breaking | 10 pages (plain tex), figures not included, VAND-TH-93-13 | Phys.Lett. B322 (1994) 207-212 | 10.1016/0370-2693(94)91108-8 | null | hep-ph | null | It is analyzed the branching ratio $B(b\rightarrow s\gamma)$ in the context
of minimal $N=1$ supergravity with radiatively broken electroweak symmetry
group. There is a strong dependence on supersymetric parameters, but
constraints on the charged Higgs mass in non-supersymmetric models are relaxed,
due to large contribution from the chargino/up-type squark sector that
interacts destructively with the Standard Model and the charged Higgs
contributions. Large suppressions/enhancements of the branching fraction are
found for large values of $\tan\beta$.
| [
{
"created": "Fri, 5 Nov 1993 00:37:24 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Diaz",
"Marco Aurelio",
""
]
] | It is analyzed the branching ratio $B(b\rightarrow s\gamma)$ in the context of minimal $N=1$ supergravity with radiatively broken electroweak symmetry group. There is a strong dependence on supersymetric parameters, but constraints on the charged Higgs mass in non-supersymmetric models are relaxed, due to large contribution from the chargino/up-type squark sector that interacts destructively with the Standard Model and the charged Higgs contributions. Large suppressions/enhancements of the branching fraction are found for large values of $\tan\beta$. |
hep-ph/0107066 | Adam Falk | Adam F. Falk | CP Tagged Decays at SuperBaBar | 14 pages, 4 figures; minimal revisions for version to appear in
Physical Review D, all formulas and conclusions unchanged | Phys.Rev.D64:093011,2001 | 10.1103/PhysRevD.64.093011 | JHU-TIPAC-2001-02 | hep-ph | null | We explore the possibility of measuring the CKM parameter gamma using CP
tagged decays at a very high luminosity e+e- B Factory. A new collider capable
of integrating as much as 10 inverse attobarns per year is being discussed as a
possible future for SLAC beyond the current PEP-II program, and could also be
in the future of KEK. In two years of operation, it could be possible for a
successor to BaBar or Belle to accumulate a sample of one million CP tagged B
decays. We find that a theoretically clean extraction of gamma with uncertainty
less than 5 degrees may be achievable in the analysis of such a data set.
| [
{
"created": "Fri, 6 Jul 2001 17:52:54 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Jul 2001 14:49:27 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Falk",
"Adam F.",
""
]
] | We explore the possibility of measuring the CKM parameter gamma using CP tagged decays at a very high luminosity e+e- B Factory. A new collider capable of integrating as much as 10 inverse attobarns per year is being discussed as a possible future for SLAC beyond the current PEP-II program, and could also be in the future of KEK. In two years of operation, it could be possible for a successor to BaBar or Belle to accumulate a sample of one million CP tagged B decays. We find that a theoretically clean extraction of gamma with uncertainty less than 5 degrees may be achievable in the analysis of such a data set. |
hep-ph/0505258 | Andreas Schaefer | P. Kroll and A. Schafer | The process p + pbar --> gamma + pi^0 within the handbag approch | null | Eur.Phys.J. A26 (2005) 89-98 | 10.1140/epja/i2005-10153-8 | null | hep-ph | null | We analyse the exclusive channel $p\pb\to\gamma \pi^0$, assuming handbag
dominance. The soft parts are parametrized in terms of CGLN amplitudes for the
$q\qb\to\gamma \pi^0$ transition and form factors for the $p\pb\to q\qb$ ones,
the latter represent moments of Generalized Distribution Amplitudes. We present
a combined fit to Fermilab data from E760 taking simultaneously into account
information from other exclusive reactions, especially from $p\pb\to
\gamma\gamma$ data. Overall a nicely consistent picture emerges, such that one
can hope, that our theoretical analysis will be reliable also for the
kinematics of GSI/FAIR, which hopefully will provide much more precise and
complete data. Consequently, data from this facility should improve our
knowledge both on the proton-antiproton distribution amplitudes and the pion
production mechanism.
| [
{
"created": "Mon, 30 May 2005 16:23:13 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Kroll",
"P.",
""
],
[
"Schafer",
"A.",
""
]
] | We analyse the exclusive channel $p\pb\to\gamma \pi^0$, assuming handbag dominance. The soft parts are parametrized in terms of CGLN amplitudes for the $q\qb\to\gamma \pi^0$ transition and form factors for the $p\pb\to q\qb$ ones, the latter represent moments of Generalized Distribution Amplitudes. We present a combined fit to Fermilab data from E760 taking simultaneously into account information from other exclusive reactions, especially from $p\pb\to \gamma\gamma$ data. Overall a nicely consistent picture emerges, such that one can hope, that our theoretical analysis will be reliable also for the kinematics of GSI/FAIR, which hopefully will provide much more precise and complete data. Consequently, data from this facility should improve our knowledge both on the proton-antiproton distribution amplitudes and the pion production mechanism. |
hep-ph/9512272 | Johannes Bluemlein | J. Bl\"umlein | On the Theoretical Status of Deep Inelastic Scattering | 27 pages, ps-file, compressed by uufiles | null | null | DESY 95-214; Invited talk at the XXV International Symposium on
Multiparticle Dynamics, Stara Lesna, Slovakia, 11-17 September 1995; to be
published in the Proceedings | hep-ph | null | The theoretical status of perturbative QED and QCD corrections to deep
inelastic scattering is reviewed.
| [
{
"created": "Mon, 11 Dec 1995 11:09:40 GMT",
"version": "v1"
}
] | 2012-08-30 | [
[
"Blümlein",
"J.",
""
]
] | The theoretical status of perturbative QED and QCD corrections to deep inelastic scattering is reviewed. |
hep-ph/9812324 | Davison E. Soper | Davison E. Soper | Talk on QCD Calculations by Numerical Integration | Talk at RADCOR 98. 11 pages with 6 figures | null | 10.1016/S0920-5632(99)00748-3 | null | hep-ph | null | Calculations in Quantum Chromodynamics are typically performed using a method
pioneered by Ellis, Ross and Terrano in 1981. In this method, one combines
numerical integrations over the momenta of final state particles with
analytical integrations over the momenta of virtual particles. I discuss a more
flexible method in which one performs all of the integrations numerically.
| [
{
"created": "Thu, 10 Dec 1998 17:03:52 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Soper",
"Davison E.",
""
]
] | Calculations in Quantum Chromodynamics are typically performed using a method pioneered by Ellis, Ross and Terrano in 1981. In this method, one combines numerical integrations over the momenta of final state particles with analytical integrations over the momenta of virtual particles. I discuss a more flexible method in which one performs all of the integrations numerically. |
2109.00039 | Saurav Das Mr. | Saurav Das and Anson Hook | Black Hole Production of Monopoles in the Early Universe | 22 pages, 2 figures | null | 10.1007/JHEP12(2021)145 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the early universe, evaporating black holes heat up the surrounding plasma
and create a temperature profile around the black hole that can be more
important than the black hole itself. As an example, we demonstrate how the hot
plasma surrounding evaporating black holes can efficiently produce monopoles
via the Kibble-Zurek mechanism. In the case where black holes reheat the
universe, reheat temperatures above $\sim 500$ GeV can already lead to
monopoles overclosing the universe.
| [
{
"created": "Tue, 31 Aug 2021 18:53:07 GMT",
"version": "v1"
}
] | 2022-01-05 | [
[
"Das",
"Saurav",
""
],
[
"Hook",
"Anson",
""
]
] | In the early universe, evaporating black holes heat up the surrounding plasma and create a temperature profile around the black hole that can be more important than the black hole itself. As an example, we demonstrate how the hot plasma surrounding evaporating black holes can efficiently produce monopoles via the Kibble-Zurek mechanism. In the case where black holes reheat the universe, reheat temperatures above $\sim 500$ GeV can already lead to monopoles overclosing the universe. |
0708.0816 | Bronislav Zakharov | B.G. Zakharov | Parton energy loss in an expanding quark-gluon plasma: Radiative vs
collisional | 13 pages, 3 figures | JETPLett.86:444-450,2007 | 10.1134/S0021364007190034 | null | hep-ph | null | We perform a comparison of the radiative and collisional parton energy losses
in an expanding quark-gluon plasma. The radiative energy loss is calculated
within the light-cone path integral approach. The collisional energy loss is
calculated using the Bjorken method with an accurate treatment of the binary
collision kinematics. Our numerical results demonstrate that for RHIC and LHC
conditions the collisional energy loss is relatively small in comparison to the
radiative one. We find an enhancement of the heavy quark radiative energy loss
as compared to that of the light quarks at high energies.
| [
{
"created": "Mon, 6 Aug 2007 18:40:57 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Zakharov",
"B. G.",
""
]
] | We perform a comparison of the radiative and collisional parton energy losses in an expanding quark-gluon plasma. The radiative energy loss is calculated within the light-cone path integral approach. The collisional energy loss is calculated using the Bjorken method with an accurate treatment of the binary collision kinematics. Our numerical results demonstrate that for RHIC and LHC conditions the collisional energy loss is relatively small in comparison to the radiative one. We find an enhancement of the heavy quark radiative energy loss as compared to that of the light quarks at high energies. |
1904.11218 | Peter Landshoff | A Donnachie and P V Landshoff | Small t elastic scattering and the rho parameter | 3 pages + 8 figures | null | 10.1016/j.physletb.2019.135008 | DAMTP-19-18 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A simple application of Regge theory, with 9 free parameters, provides a good
fit to elastic scattering data at small t from 13.76 GeV to 13 TeV. It yields a
value for rho, the ratio of the real part of the forward amplitude to its
imaginary part, close to 0.14 at 13 TeV. Although the exact value obtained for
rho is sensitive to what functional form is chosen for the fit, there is no
strong case for the presence of an odderon contribution to forward scattering.
| [
{
"created": "Thu, 25 Apr 2019 08:53:33 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Jun 2019 08:42:43 GMT",
"version": "v2"
},
{
"created": "Thu, 12 Sep 2019 08:33:35 GMT",
"version": "v3"
},
{
"created": "Sun, 15 Sep 2019 08:03:47 GMT",
"version": "v4"
},
{
"created": "Sat, 5 Oct 2019 07:07:37 GMT",
"version": "v5"
}
] | 2019-10-16 | [
[
"Donnachie",
"A",
""
],
[
"Landshoff",
"P V",
""
]
] | A simple application of Regge theory, with 9 free parameters, provides a good fit to elastic scattering data at small t from 13.76 GeV to 13 TeV. It yields a value for rho, the ratio of the real part of the forward amplitude to its imaginary part, close to 0.14 at 13 TeV. Although the exact value obtained for rho is sensitive to what functional form is chosen for the fit, there is no strong case for the presence of an odderon contribution to forward scattering. |
hep-ph/9707467 | Glennys Farrar | Glennys R. Farrar (Rutgers Univ.) | Are Light Gluinos Dead? | latex, 16pp inc 3 figs. Invited talk La Thuile, March 1997 | null | null | RU-97-22 | hep-ph | null | Not yet. ALEPH's recent exclusion limit employs an aggressive determination
of theoretical uncertainties using a simplified application of the Bayesian
method. The validity of their analysis can be evaluated by its further
implications, such as contradicting the existence a b quark and requiring
relations between hadronic event-shape observables which are not observed.
Traditional error estimation methods result in a much larger estimate for the
theoretical uncertainties. This puts the ALEPH and also Csikor-Fodor limits at
the $\sim 1~ \sigma$ level for the very light gluino scenario. A recent
astrophysical result implies direct searches will be more difficult than
previously anticipated, adding to the importance of reducing the QCD
uncertainty in predictions sensitive to indirect effects of light gluinos. Some
possible indications in favor of a light gluino are noted.
| [
{
"created": "Fri, 25 Jul 1997 14:35:54 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Farrar",
"Glennys R.",
"",
"Rutgers Univ."
]
] | Not yet. ALEPH's recent exclusion limit employs an aggressive determination of theoretical uncertainties using a simplified application of the Bayesian method. The validity of their analysis can be evaluated by its further implications, such as contradicting the existence a b quark and requiring relations between hadronic event-shape observables which are not observed. Traditional error estimation methods result in a much larger estimate for the theoretical uncertainties. This puts the ALEPH and also Csikor-Fodor limits at the $\sim 1~ \sigma$ level for the very light gluino scenario. A recent astrophysical result implies direct searches will be more difficult than previously anticipated, adding to the importance of reducing the QCD uncertainty in predictions sensitive to indirect effects of light gluinos. Some possible indications in favor of a light gluino are noted. |
1104.5487 | Carroll Wainwright | Carroll Wainwright, Stefano Profumo and Michael J. Ramsey-Musolf | Gravity Waves from a Cosmological Phase Transition: Gauge Artifacts and
Daisy Resummations | 25 pages, 10 figures | Phys.Rev.D84:023521,2011 | 10.1103/PhysRevD.84.023521 | NPAC-11-04 | hep-ph astro-ph.CO gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The finite-temperature effective potential customarily employed to describe
the physics of cosmological phase transitions often relies on specific gauge
choices, and is manifestly not gauge-invariant at finite order in its
perturbative expansion. As a result, quantities relevant for the calculation of
the spectrum of stochastic gravity waves resulting from bubble collisions in
first-order phase transitions are also not gauge-invariant. We assess the
quantitative impact of this gauge-dependence on key quantities entering
predictions for gravity waves from first order cosmological phase transitions.
We resort to a simple abelian Higgs model, and discuss the case of R_xi gauges.
By comparing with results obtained using a gauge-invariant Hamiltonian
formalism, we show that the choice of gauge can have a dramatic effect on
theoretical predictions for the normalization and shape of the expected gravity
wave spectrum. We also analyze the impact of resumming higher-order
contributions as needed to maintain the validity of the perturbative expansion,
and show that doing so can suppress the amplitude of the spectrum by an order
of magnitude or more. We comment on open issues and possible strategies for
carrying out "daisy resummed" gauge invariant computations in non-Abelian
models for which a gauge-invariant Hamiltonian formalism is not presently
available.
| [
{
"created": "Thu, 28 Apr 2011 19:55:27 GMT",
"version": "v1"
}
] | 2011-08-09 | [
[
"Wainwright",
"Carroll",
""
],
[
"Profumo",
"Stefano",
""
],
[
"Ramsey-Musolf",
"Michael J.",
""
]
] | The finite-temperature effective potential customarily employed to describe the physics of cosmological phase transitions often relies on specific gauge choices, and is manifestly not gauge-invariant at finite order in its perturbative expansion. As a result, quantities relevant for the calculation of the spectrum of stochastic gravity waves resulting from bubble collisions in first-order phase transitions are also not gauge-invariant. We assess the quantitative impact of this gauge-dependence on key quantities entering predictions for gravity waves from first order cosmological phase transitions. We resort to a simple abelian Higgs model, and discuss the case of R_xi gauges. By comparing with results obtained using a gauge-invariant Hamiltonian formalism, we show that the choice of gauge can have a dramatic effect on theoretical predictions for the normalization and shape of the expected gravity wave spectrum. We also analyze the impact of resumming higher-order contributions as needed to maintain the validity of the perturbative expansion, and show that doing so can suppress the amplitude of the spectrum by an order of magnitude or more. We comment on open issues and possible strategies for carrying out "daisy resummed" gauge invariant computations in non-Abelian models for which a gauge-invariant Hamiltonian formalism is not presently available. |
2304.06263 | Toshifumi Yamada | Naoyuki Haba, Yasuhiro Shimizu and Toshifumi Yamada | Neutrino Mass in Non-Supersymmetric $SO(10)$ GUT | 22 pages, 3 figures | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We study a prediction on neutrino observables in a non-supersymmetric
renormalizable $SO(10)$ GUT model that contains a ${\bf 10}$ complex scalar
field and a ${\bf 126}$ scalar field whose Yukawa couplings with ${\bf 16}$
matter fields provide the quark and charged lepton Yukawa couplings, neutrino
Dirac Yukawa coupling and Majorana mass for the singlet neutrinos. The $SO(10)$
breaking is achieved in two steps by a ${\cal O}(10^{15})$ GeV VEV of a ${\bf
54}$ real scalar field and a ${\cal O}(10^{14})$ GeV VEV of the ${\bf 126}$
field. First, we analyze the gauge coupling unification conditions and
determine the VEV of the ${\bf 126}$ field. Next, we constrain the Yukawa
couplings of the ${\bf 10}$ and ${\bf 126}$ fields at the scale of the ${\bf
126}$ field's VEV from experimental data on quark and charged lepton masses and
quark flavor mixings. Then we express the active neutrino mass with the above
Yukawa couplings and the ${\bf 126}$ field's VEV based on the Type-1 seesaw
mechanism, and fit neutrino oscillation data, thereby deriving a prediction on
poorly or not measured neutrino observables. What distinguishes our work from
previous studies is that we do not assign Peccei-Quinn charges on visible
sector fields so that the ${\bf 10}$ scalar field and its complex conjugate
both have Yukawa couplings with ${\bf 16}$ matter fields. From the fitting of
neutrino oscillation data, we find that not only the normal neutrino mass
hierarchy, but also the inverted hierarchy can be realized. We also reveal that
in the normal hierarchy case, the Dirac CP phase of the neutrino mixing matrix
$\delta_{CP}$ is likely in the ranges of $-2.4<\delta_{\rm CP}<-1.2$ and
$1.2<\delta_{\rm CP}<2.4$, and not in the region with $\delta_{\rm CP}\sim\pi$,
and that in the normal hierarchy case, $\theta_{23}$ is likely in the upper
octant and in the range of $0.50\lesssim\sin^2\theta_{23}\lesssim0.55$.
| [
{
"created": "Thu, 13 Apr 2023 04:48:31 GMT",
"version": "v1"
},
{
"created": "Tue, 18 Apr 2023 11:52:54 GMT",
"version": "v2"
}
] | 2023-04-19 | [
[
"Haba",
"Naoyuki",
""
],
[
"Shimizu",
"Yasuhiro",
""
],
[
"Yamada",
"Toshifumi",
""
]
] | We study a prediction on neutrino observables in a non-supersymmetric renormalizable $SO(10)$ GUT model that contains a ${\bf 10}$ complex scalar field and a ${\bf 126}$ scalar field whose Yukawa couplings with ${\bf 16}$ matter fields provide the quark and charged lepton Yukawa couplings, neutrino Dirac Yukawa coupling and Majorana mass for the singlet neutrinos. The $SO(10)$ breaking is achieved in two steps by a ${\cal O}(10^{15})$ GeV VEV of a ${\bf 54}$ real scalar field and a ${\cal O}(10^{14})$ GeV VEV of the ${\bf 126}$ field. First, we analyze the gauge coupling unification conditions and determine the VEV of the ${\bf 126}$ field. Next, we constrain the Yukawa couplings of the ${\bf 10}$ and ${\bf 126}$ fields at the scale of the ${\bf 126}$ field's VEV from experimental data on quark and charged lepton masses and quark flavor mixings. Then we express the active neutrino mass with the above Yukawa couplings and the ${\bf 126}$ field's VEV based on the Type-1 seesaw mechanism, and fit neutrino oscillation data, thereby deriving a prediction on poorly or not measured neutrino observables. What distinguishes our work from previous studies is that we do not assign Peccei-Quinn charges on visible sector fields so that the ${\bf 10}$ scalar field and its complex conjugate both have Yukawa couplings with ${\bf 16}$ matter fields. From the fitting of neutrino oscillation data, we find that not only the normal neutrino mass hierarchy, but also the inverted hierarchy can be realized. We also reveal that in the normal hierarchy case, the Dirac CP phase of the neutrino mixing matrix $\delta_{CP}$ is likely in the ranges of $-2.4<\delta_{\rm CP}<-1.2$ and $1.2<\delta_{\rm CP}<2.4$, and not in the region with $\delta_{\rm CP}\sim\pi$, and that in the normal hierarchy case, $\theta_{23}$ is likely in the upper octant and in the range of $0.50\lesssim\sin^2\theta_{23}\lesssim0.55$. |
1105.1723 | Christopher Smith | Christopher Smith | Proton stability from a fourth family | Revised and extended. To appear in Phys. Rev. D | null | 10.1103/PhysRevD.85.036005 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The possibility to violate baryon or lepton number without introducing any
new flavor structures, beyond those needed to account for the known fermion
masses and mixings, is analyzed. With four generations, but only three colors,
this minimality requirement is shown to lead to baryon number conservation, up
to negligible dimension-18 operators. In a supersymmetric context, this same
minimality principle allows only superpotential terms with an even number of
flavored superfields, hence effectively enforces R-parity both within the MSSM
and in a GUT context.
| [
{
"created": "Mon, 9 May 2011 16:46:16 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Feb 2012 08:28:30 GMT",
"version": "v2"
}
] | 2013-05-30 | [
[
"Smith",
"Christopher",
""
]
] | The possibility to violate baryon or lepton number without introducing any new flavor structures, beyond those needed to account for the known fermion masses and mixings, is analyzed. With four generations, but only three colors, this minimality requirement is shown to lead to baryon number conservation, up to negligible dimension-18 operators. In a supersymmetric context, this same minimality principle allows only superpotential terms with an even number of flavored superfields, hence effectively enforces R-parity both within the MSSM and in a GUT context. |
hep-ph/0611224 | Thomas G. Rizzo | Thomas G. Rizzo | Black Hole Production at the LHC by Standard Model Bulk Fields in the
Randall-Sundrum Model | 14 pages, 3 figs; refs and discussion added | Phys.Lett.B647:43-48,2007 | 10.1016/j.physletb.2007.01.045 | SLAC-PUB-12191 | hep-ph hep-ex | null | We consider the production of black holes at the LHC in the
Randall-Sundrum(RS) model through the collisions of Standard Model(SM) fields
in the bulk. In comparison to the previously studied case where the SM fields
are all confined to the TeV brane, we find substantial suppressions to the
corresponding collider cross sections for all initial states, i.e., $gg$, $qq$
and $gq$, where $q$ represents a light quark or anti-quark which lie close to
the Planck brane. For $b$ quarks, which are closer to the TeV brane, this
suppression effect is somewhat weaker though $b$ quark contributions to the
cross section are already quite small due to their relatively small parton
densities. Semi-quantitatively, we find that the overall black hole cross
section is reduced by roughly two orders of magnitude in comparison to the
traditional TeV brane localized RS model with the exact value being sensitive
to the detailed localizations of the light SM fermions in the bulk.
| [
{
"created": "Thu, 16 Nov 2006 19:20:17 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Nov 2006 04:17:45 GMT",
"version": "v2"
},
{
"created": "Mon, 27 Nov 2006 16:15:45 GMT",
"version": "v3"
}
] | 2009-09-29 | [
[
"Rizzo",
"Thomas G.",
""
]
] | We consider the production of black holes at the LHC in the Randall-Sundrum(RS) model through the collisions of Standard Model(SM) fields in the bulk. In comparison to the previously studied case where the SM fields are all confined to the TeV brane, we find substantial suppressions to the corresponding collider cross sections for all initial states, i.e., $gg$, $qq$ and $gq$, where $q$ represents a light quark or anti-quark which lie close to the Planck brane. For $b$ quarks, which are closer to the TeV brane, this suppression effect is somewhat weaker though $b$ quark contributions to the cross section are already quite small due to their relatively small parton densities. Semi-quantitatively, we find that the overall black hole cross section is reduced by roughly two orders of magnitude in comparison to the traditional TeV brane localized RS model with the exact value being sensitive to the detailed localizations of the light SM fermions in the bulk. |
1204.4415 | Franz Herzog | Stephan Buehler, Franz Herzog, Achilleas Lazopoulos and Romain Mueller | The fully differential hadronic production of a Higgs boson via bottom
quark fusion at NNLO | 27 pages, 13 figures, 1 lego plot | Journal of High Energy Physics, Volume 2012, Number 7 (2012), 115 | 10.1007/JHEP07(2012)115 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The fully differential computation of the hadronic production cross section
of a Higgs boson via bottom quarks is presented at NNLO in QCD. Several
differential distributions with their corresponding scale uncertainties are
presented for the 8 TeV LHC. This is the first application of the method of
non-linear mappings for NNLO differential calculations at hadron colliders.
| [
{
"created": "Thu, 19 Apr 2012 17:20:47 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Jul 2012 11:53:24 GMT",
"version": "v2"
}
] | 2012-07-25 | [
[
"Buehler",
"Stephan",
""
],
[
"Herzog",
"Franz",
""
],
[
"Lazopoulos",
"Achilleas",
""
],
[
"Mueller",
"Romain",
""
]
] | The fully differential computation of the hadronic production cross section of a Higgs boson via bottom quarks is presented at NNLO in QCD. Several differential distributions with their corresponding scale uncertainties are presented for the 8 TeV LHC. This is the first application of the method of non-linear mappings for NNLO differential calculations at hadron colliders. |
hep-ph/0602161 | Georg Wolschin | Georg Wolschin, Minoru Biyajima, Takuya Mizoguchi, and Naomichi Suzuki | Time evolution of relativistic d + Au and Au + Au collisions | 16 pages, 5 figures, 1 table | Annalen Phys. 15 (2006) 369-378 | 10.1002/andp.200510182 | null | hep-ph | null | The evolution of charged-particle production in collisions of heavy ions at
relativistic energies is investigated as function of centrality in a
nonequilibrium-statistical framework. Precise agreement with recent d + Au and
Au + Au data at sqrt(s_NN) = 200 GeV is found in a Relativistic Diffusion Model
with three sources for particle production. Only the midrapidity source comes
very close to local equilibrium, whereas the analyses of the overall
pseudorapidity distributions show that the systems remain far from statistical
equilibrium.
| [
{
"created": "Fri, 17 Feb 2006 11:30:59 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Wolschin",
"Georg",
""
],
[
"Biyajima",
"Minoru",
""
],
[
"Mizoguchi",
"Takuya",
""
],
[
"Suzuki",
"Naomichi",
""
]
] | The evolution of charged-particle production in collisions of heavy ions at relativistic energies is investigated as function of centrality in a nonequilibrium-statistical framework. Precise agreement with recent d + Au and Au + Au data at sqrt(s_NN) = 200 GeV is found in a Relativistic Diffusion Model with three sources for particle production. Only the midrapidity source comes very close to local equilibrium, whereas the analyses of the overall pseudorapidity distributions show that the systems remain far from statistical equilibrium. |
0911.5539 | Gang Hao | Gang Hao, YaBing Zuo, Cong-Feng Qiao | The Fragmentation Function of Gluon Splitting into P-wave Spin-singlet
Heavy Quarkonium | 10 pages, 3 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The gluon fragmentation function of $g \to h_c$ at leading order of strong
coupling constant $\alpha_s$ and typical velocity $v$ is calculated in the
framework of NRQCD, of which the contributions from both color-singlet and
-octet processes are taken into account and hence the result is infrared safe.
It is found that the fragmentation probability of a high energy virtual gluon
to split into $h_c$ is about $7.1\times 10^{-7}$. The analytic fragmentation
function presented in this work can be employed to the study of $h_c$
production in large transverse momentum at hadron colliders, such as Large
Hadron Collider(LHC), and is also applicable for the study of $h_b$
hadronproduction.
| [
{
"created": "Mon, 30 Nov 2009 05:16:41 GMT",
"version": "v1"
}
] | 2009-12-01 | [
[
"Hao",
"Gang",
""
],
[
"Zuo",
"YaBing",
""
],
[
"Qiao",
"Cong-Feng",
""
]
] | The gluon fragmentation function of $g \to h_c$ at leading order of strong coupling constant $\alpha_s$ and typical velocity $v$ is calculated in the framework of NRQCD, of which the contributions from both color-singlet and -octet processes are taken into account and hence the result is infrared safe. It is found that the fragmentation probability of a high energy virtual gluon to split into $h_c$ is about $7.1\times 10^{-7}$. The analytic fragmentation function presented in this work can be employed to the study of $h_c$ production in large transverse momentum at hadron colliders, such as Large Hadron Collider(LHC), and is also applicable for the study of $h_b$ hadronproduction. |
hep-ph/0201110 | Michio Hashimoto | M. Hashimoto | Topcolor Dynamics and The effective gluon-gluon-Higgs Operator | 11 pages, 1 figure, REVTeX; To appear in PRD. Discussion is improved | Phys.Rev. D66 (2002) 095015 | 10.1103/PhysRevD.66.095015 | TU-646 | hep-ph hep-ex | null | We discuss the production of the composite Higgs boson in topcolor models via
the gluon fusion process. We consider the contribution of color-octet massive
gauge bosons (colorons) strongly interacting with the top quark, in addition to
nonstandard contributions of the top-Yukawa coupling and heavy colored fermions
other than the top quark. In order to estimate the contribution of colorons, we
derive the low-energy effective theory by eliminating colorons by using the
equation of motion for colorons. We replace the composite operator (\bar{q}_L
t_R)(\bar{t}_R q_L) in the effective theory by the composite Higgs operator. We
then obtain the effective gluon-gluon-Higgs (ggH-) operator induced by colorons
and find that its coefficient (A_{col}) is proportional to m_{dyn}^2/M^2, where
M and m_{dyn} denote the coloron mass and the mass dynamically generated by
colorons, respectively. The contribution of colorons A_{col} becomes comparable
to the top-loop effect A_{top} for M=O(1TeV) and m_{dyn}=O(0.6TeV). Such a
large dynamical mass can be realized in top-seesaw (TSS) models consistently
with the experimental value of the top quark mass (m_t^{exp}), while the
dynamical mass itself is adjusted to m_t^{exp} in topcolor assisted technicolor
models (TC2). We find that the coloron contribution A_{col} can be sizable in a
certain class of TSS models: the contribution of colorons (the top-loop) is
dominant in the real (imaginary) part of the H->gg amplitude for the Higgs
boson mass m_H of the order of 1 TeV. On the other hand, enhancement of the
top-Yukawa coupling becomes important in TC2. We can observe signatures of the
Higgs boson in TC2 with m_H \sim 200 GeV even at the Tevatron Run II as well as
at the LHC. We estimate S/\sqrt{B}=3-6 for an integrated luminosity of 2
fb^{-1} and m_H=190 GeV at the Tevatron Run II.
| [
{
"created": "Sun, 13 Jan 2002 13:37:17 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Jun 2002 21:43:29 GMT",
"version": "v2"
},
{
"created": "Fri, 4 Oct 2002 14:47:22 GMT",
"version": "v3"
}
] | 2009-11-07 | [
[
"Hashimoto",
"M.",
""
]
] | We discuss the production of the composite Higgs boson in topcolor models via the gluon fusion process. We consider the contribution of color-octet massive gauge bosons (colorons) strongly interacting with the top quark, in addition to nonstandard contributions of the top-Yukawa coupling and heavy colored fermions other than the top quark. In order to estimate the contribution of colorons, we derive the low-energy effective theory by eliminating colorons by using the equation of motion for colorons. We replace the composite operator (\bar{q}_L t_R)(\bar{t}_R q_L) in the effective theory by the composite Higgs operator. We then obtain the effective gluon-gluon-Higgs (ggH-) operator induced by colorons and find that its coefficient (A_{col}) is proportional to m_{dyn}^2/M^2, where M and m_{dyn} denote the coloron mass and the mass dynamically generated by colorons, respectively. The contribution of colorons A_{col} becomes comparable to the top-loop effect A_{top} for M=O(1TeV) and m_{dyn}=O(0.6TeV). Such a large dynamical mass can be realized in top-seesaw (TSS) models consistently with the experimental value of the top quark mass (m_t^{exp}), while the dynamical mass itself is adjusted to m_t^{exp} in topcolor assisted technicolor models (TC2). We find that the coloron contribution A_{col} can be sizable in a certain class of TSS models: the contribution of colorons (the top-loop) is dominant in the real (imaginary) part of the H->gg amplitude for the Higgs boson mass m_H of the order of 1 TeV. On the other hand, enhancement of the top-Yukawa coupling becomes important in TC2. We can observe signatures of the Higgs boson in TC2 with m_H \sim 200 GeV even at the Tevatron Run II as well as at the LHC. We estimate S/\sqrt{B}=3-6 for an integrated luminosity of 2 fb^{-1} and m_H=190 GeV at the Tevatron Run II. |
1004.3073 | Pedro Bicudo | Pedro Bicudo | Confinement and chiral symmetry crossovers | 4 pages, 3 figures, contribution submitted to 45th Rencontres de
Moriond, QCD and High Energy Interactions, La Thuile, March 13-20, 2010 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the QCD phase diagram, in particular we study the critical points of
the two main QCD phase transitions, confinement and chiral symmetry breaking.
Confinement drives chiral symmetry breaking, and, due to the finite quark mass,
at small density both transitions are a crossover, while they are a first or
second order phase transition in large density. We study the QCD phase diagram
with a quark potential model including both confinement and chiral symmetry.
This formalism, in the Coulomb gauge hamiltonian formalism of QCD, is presently
the only one able to microscopically include both a quark-antiquark confining
potential and a vacuum condensate of quark-antiquark pairs. This model is able
to address all the excited hadrons, and chiral symmetry breaking, at the same
token. Our order parameters are the Polyakov loop and the quark mass gap. The
confining potential is extracted from the Lattice QCD data of the Bielefeld
group. We address how the quark masses affect the critical point location in
the phase diagram.
| [
{
"created": "Mon, 19 Apr 2010 00:27:02 GMT",
"version": "v1"
}
] | 2010-04-20 | [
[
"Bicudo",
"Pedro",
""
]
] | We study the QCD phase diagram, in particular we study the critical points of the two main QCD phase transitions, confinement and chiral symmetry breaking. Confinement drives chiral symmetry breaking, and, due to the finite quark mass, at small density both transitions are a crossover, while they are a first or second order phase transition in large density. We study the QCD phase diagram with a quark potential model including both confinement and chiral symmetry. This formalism, in the Coulomb gauge hamiltonian formalism of QCD, is presently the only one able to microscopically include both a quark-antiquark confining potential and a vacuum condensate of quark-antiquark pairs. This model is able to address all the excited hadrons, and chiral symmetry breaking, at the same token. Our order parameters are the Polyakov loop and the quark mass gap. The confining potential is extracted from the Lattice QCD data of the Bielefeld group. We address how the quark masses affect the critical point location in the phase diagram. |
hep-ph/0612202 | Albrecht Kyrieleis | A. Kyrieleis, J.R. Forshaw, M.H. Seymour | Breakdown of QCD coherence ? | 7 pages, 3 figures; proceedings of Workshop on Diffraction in
High-Energy Physics - DIFFRACTION 2006, Sep. 5-10 2006, Adamantas, Milos
island, Greece | PoSDIFF2006:031,2006 | null | null | hep-ph | null | We reconsider the calculation of a non-global QCD observable and find the
possible breakdown of QCD coherence. This breakdown arises as a result of wide
angle soft gluon emission developing a sensitivity to emission at small angles
and it leads to the appearance of super-leading logarithms. We use the `gaps
between jets' cross-section as a concrete example and illustrate that the new
logarithms are intimately connected with the presence of Coulomb gluon
contributions. Numerical estimates of their potential phenomenological
significance are presented.
| [
{
"created": "Sat, 16 Dec 2006 11:52:31 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Kyrieleis",
"A.",
""
],
[
"Forshaw",
"J. R.",
""
],
[
"Seymour",
"M. H.",
""
]
] | We reconsider the calculation of a non-global QCD observable and find the possible breakdown of QCD coherence. This breakdown arises as a result of wide angle soft gluon emission developing a sensitivity to emission at small angles and it leads to the appearance of super-leading logarithms. We use the `gaps between jets' cross-section as a concrete example and illustrate that the new logarithms are intimately connected with the presence of Coulomb gluon contributions. Numerical estimates of their potential phenomenological significance are presented. |
1003.4338 | Harleen Dahiya Dr. | Neetika Sharma, Harleen Dahiya, P.K. Chatley and Manmohan Gupta | Spin 1/2^+, spin 3/2^+ and transition magnetic moments of low lying and
charmed baryons | 18 pages, 6 tables, submitted for publication in Phys. Rev. D | Phys.Rev.D81:073001,2010 | 10.1103/PhysRevD.81.073001 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Magnetic moments of the low lying and charmed spin 1/2^+ and spin 3/2^+
baryons have been calculated in the SU(4) chiral constituent quark model
(\chiCQM) by including the contribution from c \bar c fluctuations. Explicit
calculations have been carried out for the contribution coming from the valence
quarks, "quark sea" polarizations and their orbital angular momentum. The
implications of such a model have also been studied for magnetic moments of the
low lying spin 3/2^+ \to 1/2^+ and 1/2^+ \to 1/2^+ transitions as well as the
transitions involving charmed baryons. We are able to achieve an excellent
agreement with data for the case of low lying spin 1/2^+ baryons and spin 3/2^+
baryons. For the spin 1/2^+ and spin 3/2^+ charmed baryon magnetic moments, our
results are consistent with the predictions of the QCD sum rules, Light Cone
sum rules and Spectral sum rules. For the cases where "light" quarks dominate
in the valence structure, the sea and orbital contributions are found to be
fairly significant however, they cancel in the right direction to give the
correct magnitude of the total magnetic moment. On the other hand, when there
is an excess of "heavy" quarks, the contribution of the "quark sea" is almost
negligible. The effects of configuration mixing and quark masses have also been
investigated.
| [
{
"created": "Tue, 23 Mar 2010 04:45:47 GMT",
"version": "v1"
}
] | 2010-08-19 | [
[
"Sharma",
"Neetika",
""
],
[
"Dahiya",
"Harleen",
""
],
[
"Chatley",
"P. K.",
""
],
[
"Gupta",
"Manmohan",
""
]
] | Magnetic moments of the low lying and charmed spin 1/2^+ and spin 3/2^+ baryons have been calculated in the SU(4) chiral constituent quark model (\chiCQM) by including the contribution from c \bar c fluctuations. Explicit calculations have been carried out for the contribution coming from the valence quarks, "quark sea" polarizations and their orbital angular momentum. The implications of such a model have also been studied for magnetic moments of the low lying spin 3/2^+ \to 1/2^+ and 1/2^+ \to 1/2^+ transitions as well as the transitions involving charmed baryons. We are able to achieve an excellent agreement with data for the case of low lying spin 1/2^+ baryons and spin 3/2^+ baryons. For the spin 1/2^+ and spin 3/2^+ charmed baryon magnetic moments, our results are consistent with the predictions of the QCD sum rules, Light Cone sum rules and Spectral sum rules. For the cases where "light" quarks dominate in the valence structure, the sea and orbital contributions are found to be fairly significant however, they cancel in the right direction to give the correct magnitude of the total magnetic moment. On the other hand, when there is an excess of "heavy" quarks, the contribution of the "quark sea" is almost negligible. The effects of configuration mixing and quark masses have also been investigated. |
1806.07900 | Keisuke Harigaya | Marcin Badziak, Keisuke Harigaya | Impact of an extra gauge interaction on naturalness of supersymmetry | 17 pages, 3 figures | null | 10.1007/JHEP08(2018)080 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is pointed out that in supersymmetric models with a new gauge symmetry
under which the Higgs is charged, the fine-tuning of the electroweak symmetry
breaking is relaxed due to suppression of the top Yukawa coupling at higher
scales by a new large gauge coupling. We calculate the fine-tuning in an
explicit model and find that the lower bounds on stops and gluino masses from
the naturalness criterion are increased by several hundred GeV in comparison to
the Minimal Supersymmetric Standard Model (MSSM). The fine-tuning is improved
by one to two orders of magnitude as compared to the MSSM, as a consequence of
both the suppression of the top Yukawa coupling and the additional tree-level
contribution to the Higgs mass allowing for much lighter stops.
| [
{
"created": "Wed, 20 Jun 2018 18:00:19 GMT",
"version": "v1"
}
] | 2018-08-29 | [
[
"Badziak",
"Marcin",
""
],
[
"Harigaya",
"Keisuke",
""
]
] | It is pointed out that in supersymmetric models with a new gauge symmetry under which the Higgs is charged, the fine-tuning of the electroweak symmetry breaking is relaxed due to suppression of the top Yukawa coupling at higher scales by a new large gauge coupling. We calculate the fine-tuning in an explicit model and find that the lower bounds on stops and gluino masses from the naturalness criterion are increased by several hundred GeV in comparison to the Minimal Supersymmetric Standard Model (MSSM). The fine-tuning is improved by one to two orders of magnitude as compared to the MSSM, as a consequence of both the suppression of the top Yukawa coupling and the additional tree-level contribution to the Higgs mass allowing for much lighter stops. |
0805.2704 | Miguel Sanchis | Juan-Luis Domenech-Garret and Miguel-Angel Sanchis-Lozano | QQ-onia package: a numerical solution to the Schrodinger radial equation
for heavy quarkonium | 30 pages, 3 figures, a new section on spin-dependent terms in the
potential has been added | Comput.Phys.Commun.180:768-778,2009 | 10.1016/j.cpc.2008.11.011 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper presents the basics of the QQ-onia package, a software based upon
the Numerov method which can be used to solve the Schrodinger radial equation
using a suitable potential V(r) for the heavy quarkonium system. This package
also allows the analysis of relevant properties of those resonances such as the
wave functions at the origin, their corresponding derivatives for l \neq 0
states, typical heavy quark velocities, and mean square radii. Besides, it
includes a tool to analize the spin-dependent contributions to the heavy
quarkonia spectrum, providing the hyperfine splittings, as well as the nPJ
energy levels. Finally, a simple software implemented in QQ-onia to compute E1
transition rates is presented.
| [
{
"created": "Mon, 19 May 2008 18:11:42 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Nov 2008 15:35:26 GMT",
"version": "v2"
}
] | 2009-03-24 | [
[
"Domenech-Garret",
"Juan-Luis",
""
],
[
"Sanchis-Lozano",
"Miguel-Angel",
""
]
] | This paper presents the basics of the QQ-onia package, a software based upon the Numerov method which can be used to solve the Schrodinger radial equation using a suitable potential V(r) for the heavy quarkonium system. This package also allows the analysis of relevant properties of those resonances such as the wave functions at the origin, their corresponding derivatives for l \neq 0 states, typical heavy quark velocities, and mean square radii. Besides, it includes a tool to analize the spin-dependent contributions to the heavy quarkonia spectrum, providing the hyperfine splittings, as well as the nPJ energy levels. Finally, a simple software implemented in QQ-onia to compute E1 transition rates is presented. |
2307.04847 | Juliana Carrasco Mejia | Juliana Carrasco, Jos\'e Zurita | Emerging jet probes of strongly interacting dark sectors | null | JHEP 01 (2024) 034 | 10.1007/JHEP01(2024)034 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | A strongly interacting dark sector can give rise to a class of signatures
dubbed dark showers, where in analogy to the strong sector in the Standard
Model, the dark sector undergoes its own showering and hadronization, before
decaying into Standard Model final states. When the typical decay lengths of
the dark sector mesons are larger than a few centimeters (and no larger than a
few meters) they give rise to the striking signature of emerging jets,
characterized by a large multiplicity of displaced vertices. In this article we
consider the general reinterpretation of the CMS search for emerging jets plus
prompt jets into arbitrary new physics scenarios giving rise to emerging jets.
More concretely, we consider the cases where the SM Higgs mediates between the
dark sector and the SM, for several benchmark decay scenarios. Our procedure is
validated employing the same model than the CMS emerging jet search. We find
that emerging jets can be the leading probe in regions of parameter space, in
particular when considering the so-called gluon-portal and dark photon-portal
decay benchmarks. With the current 16.1 fb$^{-1}$ of luminosity this search can
exclude down to ${\cal O} (20) \% $ exotic branching ratio of the SM Higgs, but
a naive extrapolation to the 139 fb$^{-1}$ luminosity employed in the current
model-independent, indirect bound of 16% would probe exotic branching ratios
into dark quarks down to below 10%. Further extrapolating these results to the
HL-LHC, we find that one can pin down exotic branching ratio values of 1%,
which is below the HL-LHC expectations of 2.5$-$4%. We make our recasting code
publicly available, as part of the LLP Recasting Repository.
| [
{
"created": "Mon, 10 Jul 2023 18:37:59 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Jan 2024 17:15:44 GMT",
"version": "v2"
}
] | 2024-02-22 | [
[
"Carrasco",
"Juliana",
""
],
[
"Zurita",
"José",
""
]
] | A strongly interacting dark sector can give rise to a class of signatures dubbed dark showers, where in analogy to the strong sector in the Standard Model, the dark sector undergoes its own showering and hadronization, before decaying into Standard Model final states. When the typical decay lengths of the dark sector mesons are larger than a few centimeters (and no larger than a few meters) they give rise to the striking signature of emerging jets, characterized by a large multiplicity of displaced vertices. In this article we consider the general reinterpretation of the CMS search for emerging jets plus prompt jets into arbitrary new physics scenarios giving rise to emerging jets. More concretely, we consider the cases where the SM Higgs mediates between the dark sector and the SM, for several benchmark decay scenarios. Our procedure is validated employing the same model than the CMS emerging jet search. We find that emerging jets can be the leading probe in regions of parameter space, in particular when considering the so-called gluon-portal and dark photon-portal decay benchmarks. With the current 16.1 fb$^{-1}$ of luminosity this search can exclude down to ${\cal O} (20) \% $ exotic branching ratio of the SM Higgs, but a naive extrapolation to the 139 fb$^{-1}$ luminosity employed in the current model-independent, indirect bound of 16% would probe exotic branching ratios into dark quarks down to below 10%. Further extrapolating these results to the HL-LHC, we find that one can pin down exotic branching ratio values of 1%, which is below the HL-LHC expectations of 2.5$-$4%. We make our recasting code publicly available, as part of the LLP Recasting Repository. |
1207.2308 | Yoshio Koide | Yoshio Koide and Toshifumi Yamashita | Family Gauge Bosons with an Inverted Mass Hierarchy | 7pages, 6 figures, Invited talk at GUT2012 | null | 10.1063/1.4742074 | MISC-2012-10 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A model that gives family gauge bosons with an inverted mass hierarchy is
proposed, stimulated by Sumino's cancellation mechanism for the QED radiative
correction to the charged lepton masses. The Sumino mechanism cannot
straightforwardly be applied to SUSY models because of the non-renormalization
theorem. In this talk, an alternative model which is applicable to a SUSY model
is proposed. It is essential that family gauge boson masses $m(A_i^j)$ in this
model is given by an inverted mass hierarchy $m(A_i^i) \propto
1/\sqrt{m_{ei}}$, in contrast to $m(A_i^i) \propto \sqrt{m_{ei}}$ in the
original Sumino model. Phenomenological meaning of the model is also
investigated. In particular, we notice a deviation from the $e$-$\mu$
universality in the tau decays.
| [
{
"created": "Tue, 10 Jul 2012 11:03:12 GMT",
"version": "v1"
}
] | 2015-06-05 | [
[
"Koide",
"Yoshio",
""
],
[
"Yamashita",
"Toshifumi",
""
]
] | A model that gives family gauge bosons with an inverted mass hierarchy is proposed, stimulated by Sumino's cancellation mechanism for the QED radiative correction to the charged lepton masses. The Sumino mechanism cannot straightforwardly be applied to SUSY models because of the non-renormalization theorem. In this talk, an alternative model which is applicable to a SUSY model is proposed. It is essential that family gauge boson masses $m(A_i^j)$ in this model is given by an inverted mass hierarchy $m(A_i^i) \propto 1/\sqrt{m_{ei}}$, in contrast to $m(A_i^i) \propto \sqrt{m_{ei}}$ in the original Sumino model. Phenomenological meaning of the model is also investigated. In particular, we notice a deviation from the $e$-$\mu$ universality in the tau decays. |
1710.02349 | George Leontaris | Miguel Crispim Romao, Stephen F. King, George K. Leontaris | Non-universal $Z'$ from Fluxed GUTs | 14 pages | null | 10.1016/j.physletb.2018.05.057 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We make a first systematic study of non-universal TeV scale neutral gauge
bosons $Z'$ arising naturally from a class of F-theory inspired models broken
via $SU(5)$ by flux. The phenomenological models we consider may originate from
semi-local F-theory GUTs arising from a single $E_8$ point of local
enhancement, assuming the minimal ${\cal Z}_2$ monodromy in order to allow for
a renormalisable top quark Yukawa coupling. We classify such non-universal
anomaly-free $U(1)'$ models requiring a minimal low energy spectrum and also
allowing for a vector-like family. We discuss to what extent such models can
account for the anomalous $B$-decay ratios $R_{K}$ and $R_{K^*}$.
| [
{
"created": "Fri, 6 Oct 2017 11:05:15 GMT",
"version": "v1"
}
] | 2018-05-23 | [
[
"Romao",
"Miguel Crispim",
""
],
[
"King",
"Stephen F.",
""
],
[
"Leontaris",
"George K.",
""
]
] | We make a first systematic study of non-universal TeV scale neutral gauge bosons $Z'$ arising naturally from a class of F-theory inspired models broken via $SU(5)$ by flux. The phenomenological models we consider may originate from semi-local F-theory GUTs arising from a single $E_8$ point of local enhancement, assuming the minimal ${\cal Z}_2$ monodromy in order to allow for a renormalisable top quark Yukawa coupling. We classify such non-universal anomaly-free $U(1)'$ models requiring a minimal low energy spectrum and also allowing for a vector-like family. We discuss to what extent such models can account for the anomalous $B$-decay ratios $R_{K}$ and $R_{K^*}$. |
hep-ph/0103264 | Yoshinobu Kuramashi | Yoshinobu Kuramashi | Nucleon Decay Matrix Elements from Lattice QCD | 10 pages, 3 figures as eps-file. Invited talk at 2nd Workshop on
Neutrino Oscillations and Their Origin (NOON 2000), Tokyo, Japan, 6-18 Dec
2000 | null | 10.1142/9789812810786_0029 | KEK-CP-107 | hep-ph | null | We present a GUT-model-independent calculation of hadron matrix elements for
all dimension-six operators associated with baryon number violating processes
using lattice QCD. Our results cover all the matrix elements required to
estimate the partial lifetimes of (proton,neutron)$\to$($\pi,K,\eta$) +(${\bar
\nu},e^+,\mu^+$) decay modes. We point out the necessity of disentangling two
form factors that contribute to the matrix elements; previous calculations did
not make the separation, which led to an underestimate of the physical matrix
elements. With a correct separation, we find that the matrix elements have
values 3-5 times larger than the smallest estimates employed in
phenomenological analyses of the nucleon decays, which gives stronger
constraints on GUT models. We also find that the values of the matrix elements
are comparable with the tree-level predictions of chiral Lagrangian.
| [
{
"created": "Sat, 24 Mar 2001 08:45:51 GMT",
"version": "v1"
}
] | 2016-11-23 | [
[
"Kuramashi",
"Yoshinobu",
""
]
] | We present a GUT-model-independent calculation of hadron matrix elements for all dimension-six operators associated with baryon number violating processes using lattice QCD. Our results cover all the matrix elements required to estimate the partial lifetimes of (proton,neutron)$\to$($\pi,K,\eta$) +(${\bar \nu},e^+,\mu^+$) decay modes. We point out the necessity of disentangling two form factors that contribute to the matrix elements; previous calculations did not make the separation, which led to an underestimate of the physical matrix elements. With a correct separation, we find that the matrix elements have values 3-5 times larger than the smallest estimates employed in phenomenological analyses of the nucleon decays, which gives stronger constraints on GUT models. We also find that the values of the matrix elements are comparable with the tree-level predictions of chiral Lagrangian. |
2009.13637 | Craig Roberts | Si-Xue Qin and Craig D. Roberts | Resolving the Bethe-Salpeter kernel | 9 pages, 3 figures. Accepted for publication as an "Express Letter"
in Chinese Physics Letters | null | 10.1088/0256-307X/38/7/071201 | NJU-INP 026/20 | hep-ph hep-ex hep-lat nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A novel method for constructing a Bethe-Salpeter kernel for the meson
bound-state problem is described. It produces a closed-form kernel that is
symmetry-consistent (discrete and continuous) with the gap equation defined by
any admissible gluon-quark vertex. Applicable even when the diagrammatic
content of that vertex is unknown, the scheme can foster new synergies between
continuum and lattice approaches to strong interactions. The framework is
illustrated by demonstrating that the presence of a dressed-quark anomalous
magnetic moment in the gluon-quark vertex, an emergent feature of strong
interactions, can remedy many defects of widely used meson bound-state kernels,
including the level ordering of pseudoscalar and vector meson radial
excitations.
| [
{
"created": "Mon, 28 Sep 2020 21:27:38 GMT",
"version": "v1"
},
{
"created": "Wed, 26 May 2021 05:48:01 GMT",
"version": "v2"
}
] | 2021-08-11 | [
[
"Qin",
"Si-Xue",
""
],
[
"Roberts",
"Craig D.",
""
]
] | A novel method for constructing a Bethe-Salpeter kernel for the meson bound-state problem is described. It produces a closed-form kernel that is symmetry-consistent (discrete and continuous) with the gap equation defined by any admissible gluon-quark vertex. Applicable even when the diagrammatic content of that vertex is unknown, the scheme can foster new synergies between continuum and lattice approaches to strong interactions. The framework is illustrated by demonstrating that the presence of a dressed-quark anomalous magnetic moment in the gluon-quark vertex, an emergent feature of strong interactions, can remedy many defects of widely used meson bound-state kernels, including the level ordering of pseudoscalar and vector meson radial excitations. |
2009.02492 | Halil Mutuk | Halil Mutuk | Monte-Carlo Based QCD Sum Rules Analysis of $X_0(2900)$ and $X_1(2900)$ | 9 pages, 4 figures, new references added, some typos are corrected,
further classical and Monte-Carlo analysis results are given | J. Phys. G: Nucl. Part. Phys. 48 055007 (2021) | 10.1088/1361-6471/abeb7f | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | Motivated by the very recent discovery of fully open-flavor exotic states
$X_0(2900)$ and $X_1(2900)$ by the LHCb Collaboration, we study possible
interpretations of these exotic states by QCD Sum Rules method. We have
calculated mass and decay constant by traditional QCD Sum Rules analysis and
Monte-Carlo based analysis. $X_0(2900)$ and $X_1(2900)$ are studied in
molecular and diquark-antidiquark tetraquark pictures, respectively. Obtained
mass results agree well with the masses observed in the experiment. We also
made a Monte-Carlo based analysis within QCD Sum Rules for the mass and decay
constant distributions to investigate the possible assignments for the
structures of $X_0(2900)$ and $X_1(2900)$.
| [
{
"created": "Sat, 5 Sep 2020 08:21:20 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Oct 2020 10:18:17 GMT",
"version": "v2"
},
{
"created": "Mon, 8 Mar 2021 09:10:27 GMT",
"version": "v3"
}
] | 2021-04-16 | [
[
"Mutuk",
"Halil",
""
]
] | Motivated by the very recent discovery of fully open-flavor exotic states $X_0(2900)$ and $X_1(2900)$ by the LHCb Collaboration, we study possible interpretations of these exotic states by QCD Sum Rules method. We have calculated mass and decay constant by traditional QCD Sum Rules analysis and Monte-Carlo based analysis. $X_0(2900)$ and $X_1(2900)$ are studied in molecular and diquark-antidiquark tetraquark pictures, respectively. Obtained mass results agree well with the masses observed in the experiment. We also made a Monte-Carlo based analysis within QCD Sum Rules for the mass and decay constant distributions to investigate the possible assignments for the structures of $X_0(2900)$ and $X_1(2900)$. |
hep-ph/0504199 | Christophe Royon | M. Boonekamp, J. Cammin, R. Peschanski, C. Royon | Threshold scans in Central Diffraction at the LHC | 11 pages | null | null | null | hep-ph | null | We propose a new set of measurements which can be performed at the LHC using
roman pot detectors. The method exploits excitation curves in central
diffractive pair production, and is illustrated using the examples of the W
boson and top quark mass measurements. Further applications are mentioned.
| [
{
"created": "Thu, 21 Apr 2005 22:49:14 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Boonekamp",
"M.",
""
],
[
"Cammin",
"J.",
""
],
[
"Peschanski",
"R.",
""
],
[
"Royon",
"C.",
""
]
] | We propose a new set of measurements which can be performed at the LHC using roman pot detectors. The method exploits excitation curves in central diffractive pair production, and is illustrated using the examples of the W boson and top quark mass measurements. Further applications are mentioned. |
hep-ph/0302250 | Heinz Juergen Schreiber | M. Dubinin (Moscow State U.), H.J. Schreiber (DESY Zeuthen) and A.
Vologdin (Moscow State U.) | Measurement of the $HZ\gamma$ Coupling at the Future Linear \ee Collider | 17 pages, 6 figures | Eur.Phys.J.C30:337-344,2003 | 10.1140/epjc/s2003-01304-4 | DESY 03-017, LC-PHSM-2003-004 | hep-ph | null | We examine the prospects for measuring the $H Z \gamma$ coupling of a
Standard Model-like Higgs boson with a mass between 120 and 160 GeV at the
future TESLA linear \ee collider, assuming an integrated luminosity of 1
ab$^{-1}$ and a center-of-mass energy of 500 GeV. We consider the Higgs boson
produced in association with $\nu_e \bar{\nu_e}$ via the $W W$ fusion reaction
$e^+e^- \to \nu_e \bar{\nu_e} H$, followed by the rare decay into a $Z$ boson
and a photon, $H \to Z \gamma$. Accounting for all main background
contributions, different selection procedures are discussed. Uncertainties on
the \hZg branching fraction of approximately 48% (27%, 44%) can be achieved in
unpolarised \ee collisions for $M_H$ = 120 (140, 160) GeV. With appropriate
initial state polarisations $\Delta$BF(\hZg)/BF(\hZg), or the precisions on the
\hZg partial width, can be improved to 29% (17%, 27%) and provide valuable
information on the $HZ\gamma$ coupling. We regard our results as a convincing
confirmation of the great potential of a linear collider to access and reliably
measure important parameters of the Higgs boson despite initially overwhelming
background with final state signature similar to the signal events.
| [
{
"created": "Thu, 27 Feb 2003 10:49:32 GMT",
"version": "v1"
}
] | 2011-09-13 | [
[
"Dubinin",
"M.",
"",
"Moscow State U."
],
[
"Schreiber",
"H. J.",
"",
"DESY Zeuthen"
],
[
"Vologdin",
"A.",
"",
"Moscow State U."
]
] | We examine the prospects for measuring the $H Z \gamma$ coupling of a Standard Model-like Higgs boson with a mass between 120 and 160 GeV at the future TESLA linear \ee collider, assuming an integrated luminosity of 1 ab$^{-1}$ and a center-of-mass energy of 500 GeV. We consider the Higgs boson produced in association with $\nu_e \bar{\nu_e}$ via the $W W$ fusion reaction $e^+e^- \to \nu_e \bar{\nu_e} H$, followed by the rare decay into a $Z$ boson and a photon, $H \to Z \gamma$. Accounting for all main background contributions, different selection procedures are discussed. Uncertainties on the \hZg branching fraction of approximately 48% (27%, 44%) can be achieved in unpolarised \ee collisions for $M_H$ = 120 (140, 160) GeV. With appropriate initial state polarisations $\Delta$BF(\hZg)/BF(\hZg), or the precisions on the \hZg partial width, can be improved to 29% (17%, 27%) and provide valuable information on the $HZ\gamma$ coupling. We regard our results as a convincing confirmation of the great potential of a linear collider to access and reliably measure important parameters of the Higgs boson despite initially overwhelming background with final state signature similar to the signal events. |
hep-ph/9909563 | Brent D. Nelson | Mary K. Gaillard and Brent D. Nelson | Constraints on Hidden Sector Gaugino Condensation | 33 pages, 10 figures. Full postscript also available from
http://phyweb.lbl.gov/theorygroup/papers/44305.ps | Nucl.Phys.B571:3-25,2000 | 10.1016/S0550-3213(99)00811-1 | LBNL-44305, UCB-PTH-99/44 | hep-ph | null | We study the phenomenology of a class of models describing modular invariant
gaugino condensation in the hidden sector of a low-energy effective theory
derived from the heterotic string. Placing simple demands on the resulting
observable sector, such as a supersymmetry-breaking scale of approximately 1
TeV, a vacuum with properly broken electroweak symmetry, superpartner masses
above current direct search limits, etc., results in significant restrictions
on the possible configurations of the hidden sector.
| [
{
"created": "Wed, 29 Sep 1999 23:38:25 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Gaillard",
"Mary K.",
""
],
[
"Nelson",
"Brent D.",
""
]
] | We study the phenomenology of a class of models describing modular invariant gaugino condensation in the hidden sector of a low-energy effective theory derived from the heterotic string. Placing simple demands on the resulting observable sector, such as a supersymmetry-breaking scale of approximately 1 TeV, a vacuum with properly broken electroweak symmetry, superpartner masses above current direct search limits, etc., results in significant restrictions on the possible configurations of the hidden sector. |
hep-ph/0009177 | Massimo Di Pierro | Massimo Di Pierro, Estia Eichten | Hadronic Decays of Excited Heavy Mesons | 4 pages (incl. figures), proceedings of the IV International
Conference on "Hyperons, Charm and Beauty Hadrons", Valencia (Spain) | Nucl.Phys.Proc.Suppl. 93 (2001) 130-133 | 10.1016/S0920-5632(00)01076-8 | null | hep-ph | null | We studied the hadronic decays of excited states of heavy mesons (D, D_s, B
and B_s) to lighter states by emission of pi, eta or K. Wavefunctions and
energy levels of these excited states are determined using a Dirac equation for
the light quark in the potential generated by the heavy quark (including first
order corrections in the heavy quark expansion). Transition amplitudes are
computed in the context of the Heavy Chiral Quark Model.
| [
{
"created": "Thu, 14 Sep 2000 22:44:36 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Di Pierro",
"Massimo",
""
],
[
"Eichten",
"Estia",
""
]
] | We studied the hadronic decays of excited states of heavy mesons (D, D_s, B and B_s) to lighter states by emission of pi, eta or K. Wavefunctions and energy levels of these excited states are determined using a Dirac equation for the light quark in the potential generated by the heavy quark (including first order corrections in the heavy quark expansion). Transition amplitudes are computed in the context of the Heavy Chiral Quark Model. |
0804.1466 | Michele Maltoni | Evgeny Kh. Akhmedov, Michele Maltoni, Alexei Yu. Smirnov | Neutrino oscillograms of the Earth: effects of 1-2 mixing and
CP-violation | 49 pages, LaTeX file using JHEP style, 13 figures included. Final
version to appear in JHEP | JHEP 0806:072,2008 | 10.1088/1126-6708/2008/06/072 | IFT-UAM/CSIC-08-18 | hep-ph astro-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We develop a comprehensive description of three flavor neutrino oscillations
inside the Earth in terms of neutrino oscillograms in the whole range of nadir
angles and for energies above 0.1 GeV. The effects of the 1-2 mass splitting
and mixing as well the interference of the 1-2 and 1-3 modes of oscillations
are quantified. The 1-2 mass splitting and mixing lead to the appearance, apart
from the resonance MSW peaks, of the parametric resonance peak for
core-crossing trajectories at E_nu ~= 0.2 GeV. We show that the interference
effects, in particular CP violation, have a domain structure with borders
determined by the solar and atmospheric magic lines and the lines of the
interference phase condition. The dependence of the oscillograms on the Dirac
CP-violating phase is studied. We show that for sin^2(2 theta13) < 0.1 the
strongest dependence of the oscillograms on delta is in the 1-2 and 1-3
resonance regions.
| [
{
"created": "Wed, 9 Apr 2008 19:31:28 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Apr 2008 12:20:43 GMT",
"version": "v2"
},
{
"created": "Mon, 5 May 2008 12:44:38 GMT",
"version": "v3"
},
{
"created": "Wed, 18 Jun 2008 15:25:42 GMT",
"version": "v4"
}
] | 2009-02-09 | [
[
"Akhmedov",
"Evgeny Kh.",
""
],
[
"Maltoni",
"Michele",
""
],
[
"Smirnov",
"Alexei Yu.",
""
]
] | We develop a comprehensive description of three flavor neutrino oscillations inside the Earth in terms of neutrino oscillograms in the whole range of nadir angles and for energies above 0.1 GeV. The effects of the 1-2 mass splitting and mixing as well the interference of the 1-2 and 1-3 modes of oscillations are quantified. The 1-2 mass splitting and mixing lead to the appearance, apart from the resonance MSW peaks, of the parametric resonance peak for core-crossing trajectories at E_nu ~= 0.2 GeV. We show that the interference effects, in particular CP violation, have a domain structure with borders determined by the solar and atmospheric magic lines and the lines of the interference phase condition. The dependence of the oscillograms on the Dirac CP-violating phase is studied. We show that for sin^2(2 theta13) < 0.1 the strongest dependence of the oscillograms on delta is in the 1-2 and 1-3 resonance regions. |
1905.12182 | Shuailiang Ge | Shuailiang Ge | Sublunar-Mass Primordial Black Holes from Closed Axion Domain Walls | 10 pages, 6 figures. Match the accepted manuscript | Physics of the Dark Universe 27 (2020) 100440 | 10.1016/j.dark.2019.100440 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the formation of primordial black holes (PBHs) from the collapse of
closed domain walls (DWs) which naturally arise in QCD axion models near the
QCD scale together with the main string-wall network. The size distribution of
the closed DWs is determined by percolation theory, from which we further
obtain PBH mass distribution and abundance. Various observational constraints
on PBH abundance in turn also constrain axion parameters. Our model prefers
axion mass around the meV scale ($f_{a}\sim 10^{9}$ GeV). The corresponding
PBHs are in the sublunar-mass window $10^{20}$-$10^{22}$ g (i.e.,
$10^{-13}$-$10^{-11}M_{\odot}$), one of few mass windows still available for
PBHs contributing significantly to dark matter (DM). In our model, PBH
abundance could reach $\sim1\%$ or even more of DM, sensitive to the formation
efficiency of closed axion DWs.
| [
{
"created": "Wed, 29 May 2019 02:39:09 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Jul 2019 02:11:59 GMT",
"version": "v2"
},
{
"created": "Tue, 7 Jan 2020 00:08:48 GMT",
"version": "v3"
}
] | 2020-01-08 | [
[
"Ge",
"Shuailiang",
""
]
] | We study the formation of primordial black holes (PBHs) from the collapse of closed domain walls (DWs) which naturally arise in QCD axion models near the QCD scale together with the main string-wall network. The size distribution of the closed DWs is determined by percolation theory, from which we further obtain PBH mass distribution and abundance. Various observational constraints on PBH abundance in turn also constrain axion parameters. Our model prefers axion mass around the meV scale ($f_{a}\sim 10^{9}$ GeV). The corresponding PBHs are in the sublunar-mass window $10^{20}$-$10^{22}$ g (i.e., $10^{-13}$-$10^{-11}M_{\odot}$), one of few mass windows still available for PBHs contributing significantly to dark matter (DM). In our model, PBH abundance could reach $\sim1\%$ or even more of DM, sensitive to the formation efficiency of closed axion DWs. |
2103.03897 | Andrew Blance | Andrew Blance and Michael Spannowsky | Unsupervised Event Classification with Graphs on Classical and Photonic
Quantum Computers | 24 pages, 7 figures | J. High Energ. Phys. 2021, 170 | 10.1007/JHEP08(2021)170 | null | hep-ph hep-ex physics.data-an quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Photonic Quantum Computers provides several benefits over the discrete
qubit-based paradigm of quantum computing. By using the power of
continuous-variable computing we build an anomaly detection model to use on
searches for New Physics. Our model uses Gaussian Boson Sampling, a $\#$P-hard
problem and thus not efficiently accessible to classical devices. This is used
to create feature vectors from graph data, a natural format for representing
data of high-energy collision events. A simple K-means clustering algorithm is
used to provide a baseline method of classification. We then present a novel
method of anomaly detection, combining the use of Gaussian Boson Sampling and a
quantum extension to K-means known as Q-means. This is found to give equivalent
results compared to the classical clustering version while also reducing the
$\mathcal{O}$ complexity, with respect to the sample's feature-vector length,
from $\mathcal{O}(N)$ to $\mathcal{O}(\mbox{log}(N))$. Due to the speed of the
sampling algorithm and the feasibility of near-term photonic quantum devices,
anomaly detection at the trigger level can become practical in future LHC runs.
| [
{
"created": "Fri, 5 Mar 2021 19:02:31 GMT",
"version": "v1"
}
] | 2021-12-01 | [
[
"Blance",
"Andrew",
""
],
[
"Spannowsky",
"Michael",
""
]
] | Photonic Quantum Computers provides several benefits over the discrete qubit-based paradigm of quantum computing. By using the power of continuous-variable computing we build an anomaly detection model to use on searches for New Physics. Our model uses Gaussian Boson Sampling, a $\#$P-hard problem and thus not efficiently accessible to classical devices. This is used to create feature vectors from graph data, a natural format for representing data of high-energy collision events. A simple K-means clustering algorithm is used to provide a baseline method of classification. We then present a novel method of anomaly detection, combining the use of Gaussian Boson Sampling and a quantum extension to K-means known as Q-means. This is found to give equivalent results compared to the classical clustering version while also reducing the $\mathcal{O}$ complexity, with respect to the sample's feature-vector length, from $\mathcal{O}(N)$ to $\mathcal{O}(\mbox{log}(N))$. Due to the speed of the sampling algorithm and the feasibility of near-term photonic quantum devices, anomaly detection at the trigger level can become practical in future LHC runs. |
hep-ph/0212307 | Eduardo Ponton | Marcela Carena, Eduardo Ponton, Tim Tait, C.E.M Wagner | Opaque Branes in Warped Backgrounds | 37 pages, 12 figures, improved analysis of the precision electroweak
constraints | Phys.Rev.D67:096006,2003 | 10.1103/PhysRevD.67.096006 | null | hep-ph | null | We examine localized kinetic terms for gauge fields which can propagate into
compact, warped extra dimensions. We show that these terms can have a relevant
impact on the values of the Kaluza-Klein (KK) gauge field masses, wave
functions, and couplings to brane and bulk matter. The resulting
phenomenological implications are discussed. In particular, we show that the
presence of opaque branes, with non-vanishing brane-localized gauge kinetic
terms, allow much lower values of the lightest KK mode than in the case of
transparent branes. Moreover, we show that if the large discrepancies among the
different determinations of the weak mixing angle would be solved in favor of
the value obtained from the lepton asymmetries, bulk electroweak gauge fields
in warped-extra dimensions may lead to an improvement of the agreement of the
fit to the electroweak precision data for a Higgs mass of the order of the weak
scale and a mass of the first gauge boson KK excitation most likely within
reach of the LHC.
| [
{
"created": "Fri, 20 Dec 2002 20:20:01 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Mar 2003 21:59:30 GMT",
"version": "v2"
}
] | 2009-09-29 | [
[
"Carena",
"Marcela",
""
],
[
"Ponton",
"Eduardo",
""
],
[
"Tait",
"Tim",
""
],
[
"Wagner",
"C. E. M",
""
]
] | We examine localized kinetic terms for gauge fields which can propagate into compact, warped extra dimensions. We show that these terms can have a relevant impact on the values of the Kaluza-Klein (KK) gauge field masses, wave functions, and couplings to brane and bulk matter. The resulting phenomenological implications are discussed. In particular, we show that the presence of opaque branes, with non-vanishing brane-localized gauge kinetic terms, allow much lower values of the lightest KK mode than in the case of transparent branes. Moreover, we show that if the large discrepancies among the different determinations of the weak mixing angle would be solved in favor of the value obtained from the lepton asymmetries, bulk electroweak gauge fields in warped-extra dimensions may lead to an improvement of the agreement of the fit to the electroweak precision data for a Higgs mass of the order of the weak scale and a mass of the first gauge boson KK excitation most likely within reach of the LHC. |
1104.4807 | Howard Baer | Howard Baer and Andre Lessa | Some necessary conditions for allowing the PQ scale as high as M_{GUT}
in SUSY models with an axino or neutralino LSP | 29 pages including 14 .eps figures | null | 10.1007/JHEP06(2011)027 | null | hep-ph astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine some conditions which are needed to allow the Peccei-Quinn scale
(f_a) as high as the SUSY GUT scale (M_{GUT} \sim 10^{16} GeV) in the context
of the PQMSSM with either an axino or a neutralino LSP. The main problem in
non-SUSY models with f_a\sim M_{GUT} is the generation of an overabundance of
axion dark matter (\sim f_a^{7/6}) due to vacuum misalignment. We show that
once all the components of the axion supermultiplet are included, the upper
limit on f_a can be evaded due to large entropy injection from saxion decays.
This large entropy injection also dilutes all other quasi-stable relic
densities, naturally evading the BBN constraints and solving the gravitino
problem. We find that f_a\sim M_{GUT} can be allowed by relic density/BBN
constraints provided that the saxion mass m_s> 50 TeV, the initial saxion field
value is of order of the PQ scale and the initial axion mis-alignment angle
\theta_i\alt 0.05 . These restrictions can be considerably loosened for f_a\sim
10^{15} GeV. The allowed range for the re-heat temperature (T_R) is strongly
dependent on the nature of the LSP. For the axino LSP, T_R \gtrsim 10^8 GeV,
while for neutralino LSP any value is allowed. In the latter case, f_a\sim
M_{GUT} can be more easily accommodated than in the axino LSP scenario. For
f_a\sim M_{GUT} in SUSY models, the dark matter abundance should be dominated
by axions, albeit with mass m_a\sim 10^{-10} eV, far below the region currently
probed by experiment.
| [
{
"created": "Mon, 25 Apr 2011 20:41:48 GMT",
"version": "v1"
},
{
"created": "Wed, 25 May 2011 19:08:16 GMT",
"version": "v2"
}
] | 2015-05-28 | [
[
"Baer",
"Howard",
""
],
[
"Lessa",
"Andre",
""
]
] | We examine some conditions which are needed to allow the Peccei-Quinn scale (f_a) as high as the SUSY GUT scale (M_{GUT} \sim 10^{16} GeV) in the context of the PQMSSM with either an axino or a neutralino LSP. The main problem in non-SUSY models with f_a\sim M_{GUT} is the generation of an overabundance of axion dark matter (\sim f_a^{7/6}) due to vacuum misalignment. We show that once all the components of the axion supermultiplet are included, the upper limit on f_a can be evaded due to large entropy injection from saxion decays. This large entropy injection also dilutes all other quasi-stable relic densities, naturally evading the BBN constraints and solving the gravitino problem. We find that f_a\sim M_{GUT} can be allowed by relic density/BBN constraints provided that the saxion mass m_s> 50 TeV, the initial saxion field value is of order of the PQ scale and the initial axion mis-alignment angle \theta_i\alt 0.05 . These restrictions can be considerably loosened for f_a\sim 10^{15} GeV. The allowed range for the re-heat temperature (T_R) is strongly dependent on the nature of the LSP. For the axino LSP, T_R \gtrsim 10^8 GeV, while for neutralino LSP any value is allowed. In the latter case, f_a\sim M_{GUT} can be more easily accommodated than in the axino LSP scenario. For f_a\sim M_{GUT} in SUSY models, the dark matter abundance should be dominated by axions, albeit with mass m_a\sim 10^{-10} eV, far below the region currently probed by experiment. |
1010.2633 | Vladimir Zoller | R. Fiore and V.R. Zoller | Current non-conservation effects in ultra-high energy neutrino
interactions | 9 pages, 1 figure | JETP Lett.92:654-657,2010 | 10.1134/S0021364010220030 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The overall hardness scale of the ultra-high energy neutrino-nucleon
interactions is usually estimated as $Q^2\sim m_W^2$. The effect of
non-conservation of weak currents pushes this scale up to the top quark mass
squared and changes dynamics of the scattering process. The Double Leading Log
Approximation provides simple and numerically accurate formula for the
top-bottom contribution to the total cross section $\sigma^{\nu N}$.
Corresponding correction to $\sigma^{\nu N}$ appears to be numerically large.
It is comparable with the leading contribution evaluated in the massless quark
approximation.
| [
{
"created": "Wed, 13 Oct 2010 11:37:14 GMT",
"version": "v1"
}
] | 2011-03-14 | [
[
"Fiore",
"R.",
""
],
[
"Zoller",
"V. R.",
""
]
] | The overall hardness scale of the ultra-high energy neutrino-nucleon interactions is usually estimated as $Q^2\sim m_W^2$. The effect of non-conservation of weak currents pushes this scale up to the top quark mass squared and changes dynamics of the scattering process. The Double Leading Log Approximation provides simple and numerically accurate formula for the top-bottom contribution to the total cross section $\sigma^{\nu N}$. Corresponding correction to $\sigma^{\nu N}$ appears to be numerically large. It is comparable with the leading contribution evaluated in the massless quark approximation. |
2009.08345 | Feng-Kun Guo | Meng-Lin Du, Vadim Baru, Feng-Kun Guo, Christoph Hanhart, Ulf-G.
Mei{\ss}ner, Alexey Nefediev, Igor Strakovsky | Deciphering the mechanism of near-threshold $J/\psi$ photoproduction | 6 pages, 5 figures | Eur. Phys. J. C 80 (2020) 1053 | 10.1140/epjc/s10052-020-08620-5 | null | hep-ph hep-ex hep-lat nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The photoproduction of the $J/\psi$ off the proton is believed to deepen our
understanding of various physics issues. On the one hand, it is proposed to
provide access to the origin of the proton mass, based on the QCD multipole
expansion. On the other hand, it can be employed in a study of pentaquark
states. The process is usually assumed to proceed through vector-meson
dominance, that is the photon couples to a $J/\psi$ which rescatters with the
proton to give the $J/\psi p$ final state. In this Letter, we provide a
compelling hint for and propose measurements necessary to confirm a novel
production mechanism via the $\Lambda_c \bar D^{(*)}$ intermediate states. In
particular, there must be cusp structures at the $\Lambda_c \bar D^{(*)}$
thresholds in the energy dependence of the $J/\psi$ photoproduction cross
section. The same mechanism also implies the $J/\psi$-nucleon scattering
lengths of order 1 mfm. Given this, one expects only a minor contribution of
charm quarks to the nucleon mass.
| [
{
"created": "Thu, 17 Sep 2020 14:49:06 GMT",
"version": "v1"
}
] | 2020-11-19 | [
[
"Du",
"Meng-Lin",
""
],
[
"Baru",
"Vadim",
""
],
[
"Guo",
"Feng-Kun",
""
],
[
"Hanhart",
"Christoph",
""
],
[
"Meißner",
"Ulf-G.",
""
],
[
"Nefediev",
"Alexey",
""
],
[
"Strakovsky",
"Igor",
""
]
] | The photoproduction of the $J/\psi$ off the proton is believed to deepen our understanding of various physics issues. On the one hand, it is proposed to provide access to the origin of the proton mass, based on the QCD multipole expansion. On the other hand, it can be employed in a study of pentaquark states. The process is usually assumed to proceed through vector-meson dominance, that is the photon couples to a $J/\psi$ which rescatters with the proton to give the $J/\psi p$ final state. In this Letter, we provide a compelling hint for and propose measurements necessary to confirm a novel production mechanism via the $\Lambda_c \bar D^{(*)}$ intermediate states. In particular, there must be cusp structures at the $\Lambda_c \bar D^{(*)}$ thresholds in the energy dependence of the $J/\psi$ photoproduction cross section. The same mechanism also implies the $J/\psi$-nucleon scattering lengths of order 1 mfm. Given this, one expects only a minor contribution of charm quarks to the nucleon mass. |
0711.3003 | Georg Weiglein | Georg Weiglein | Electroweak Physics at the ILC | 5 pages, contribution to the proceedings of EPS07 | J.Phys.Conf.Ser.110:042033,2008 | 10.1088/1742-6596/110/4/042033 | IPPP/07/85, DCPT/07/170 | hep-ph | null | Some aspects of electroweak physics at the International Linear Collider
(ILC) are reviewed. The importance of precision measurements in the Higgs
sector and in top-quark physics is emphasized, and the physics potential of the
GigaZ option of the ILC is discussed. It is shown in particular that even in a
scenario where the states of new physics are so heavy that they would be
outside of the reach of the LHC and the first phase of the ILC, the GigaZ
precision on the effective weak mixing angle may nevertheless allow the
detection of quantum effects of new physics.
| [
{
"created": "Mon, 19 Nov 2007 19:24:02 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Weiglein",
"Georg",
""
]
] | Some aspects of electroweak physics at the International Linear Collider (ILC) are reviewed. The importance of precision measurements in the Higgs sector and in top-quark physics is emphasized, and the physics potential of the GigaZ option of the ILC is discussed. It is shown in particular that even in a scenario where the states of new physics are so heavy that they would be outside of the reach of the LHC and the first phase of the ILC, the GigaZ precision on the effective weak mixing angle may nevertheless allow the detection of quantum effects of new physics. |
2306.15313 | Patrick Adolf | Patrick Adolf, Martin Hirsch and Heinrich P\"as | Radiative neutrino masses and the Cohen-Kaplan-Nelson bound | 13 pages, 9 figures | null | null | DO-TH 23/08 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, an increasing interest in UV/IR mixing phenomena has drawn
attention to the range of validity of standard quantum field theory. Here we
explore the consequences of such a limited range of validity in the context of
radiative models for neutrino mass generation. We adopt an argument first
published by Cohen, Kaplan and Nelson that gravity implies both UV and IR
cutoffs, apply it to the loop integrals describing radiative corrections, and
demonstrate that this effect has significant consequences for the parameter
space of radiative neutrino mass models.
| [
{
"created": "Tue, 27 Jun 2023 08:58:33 GMT",
"version": "v1"
}
] | 2023-06-28 | [
[
"Adolf",
"Patrick",
""
],
[
"Hirsch",
"Martin",
""
],
[
"Päs",
"Heinrich",
""
]
] | Recently, an increasing interest in UV/IR mixing phenomena has drawn attention to the range of validity of standard quantum field theory. Here we explore the consequences of such a limited range of validity in the context of radiative models for neutrino mass generation. We adopt an argument first published by Cohen, Kaplan and Nelson that gravity implies both UV and IR cutoffs, apply it to the loop integrals describing radiative corrections, and demonstrate that this effect has significant consequences for the parameter space of radiative neutrino mass models. |
hep-ph/9809494 | Tadek Wibig | Tadeusz Wibig and Dorota Sobczynska (Univ. of Lodz) | Proton-nucleus cross section at high energies | 9pp (9 eps figures) | J.Phys.G24:2037-2047,1998 | 10.1088/0954-3899/24/11/006 | ZPK-UL-980923 | hep-ph | null | Cross sections for proton inelastic collision with different nuclei are
described within the Glauber and multiple scattering approximations. A
significant difference between approximate `Glauber' formula and exact
calculations with a geometrical scaling assumption for very high-energy cross
section is shown. Experimental values of proton-proton cross sections obtained
using extensive air shower data are based on the relationship of proton-proton
and respective proton-air absorption cross sections. According to obtained
results values reported by the Akeno and Fly's Eye experimental groups are
about 10% overestimated. The proper energy dependence of absorption cross
section for collisions with air nuclei is of a great importance for studies of
high energy cosmic rays using the Monte Carlo technique.
| [
{
"created": "Wed, 23 Sep 1998 09:48:36 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Wibig",
"Tadeusz",
"",
"Univ. of Lodz"
],
[
"Sobczynska",
"Dorota",
"",
"Univ. of Lodz"
]
] | Cross sections for proton inelastic collision with different nuclei are described within the Glauber and multiple scattering approximations. A significant difference between approximate `Glauber' formula and exact calculations with a geometrical scaling assumption for very high-energy cross section is shown. Experimental values of proton-proton cross sections obtained using extensive air shower data are based on the relationship of proton-proton and respective proton-air absorption cross sections. According to obtained results values reported by the Akeno and Fly's Eye experimental groups are about 10% overestimated. The proper energy dependence of absorption cross section for collisions with air nuclei is of a great importance for studies of high energy cosmic rays using the Monte Carlo technique. |
hep-ph/0211192 | Sally Dawson | S. Dawson (BNL) | Why We Need Both the LHC and an e+e- Linear Collider | 10 pages, 7 figures. To appear in the Proceedings of the 14th Topical
Conference on Hadron Collider Physics (HCP2002), 29 September-4 October,
2002, Karlsruhe, Germany | null | null | BNL-HET-02/24 | hep-ph | null | We discuss the connection between the understanding of TeV scale physics to
be found at the LHC and a high energy e+e- linear collider, using Higgs
physics, low energy supersymmetry, and the top quark sector as examples.
| [
{
"created": "Wed, 13 Nov 2002 19:48:08 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Dawson",
"S.",
"",
"BNL"
]
] | We discuss the connection between the understanding of TeV scale physics to be found at the LHC and a high energy e+e- linear collider, using Higgs physics, low energy supersymmetry, and the top quark sector as examples. |
2009.14149 | Ahmad Moursy ElSayed | Ahmad Moursy | No-scale hybrid inflation with R-symmetry breaking | 30 pages, 9 figures, submitted to JHEP | null | 10.1007/JHEP02(2021)230 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we provide a no-scale supergravity scenario of hybrid inflation
with R-symmetry being broken maximally. We investigate the inflation dynamics
in details in both cases of pure F-term hybrid inflation and when adding
constant Fayet-Iliopoulos D-terms. The effective inflation potential is
asymptotically flat in a region of the parameter space in both cases. We
explore all regions in the parameter space when discussing the constraints from
the observables. We point out a connection between inflation, R-symmetry
breaking and GUT scales. The moduli backreaction and SUSY breaking effects are
investigated in a specific stabilization mechanism. We emphasis that a
successful reheating is not affected by R-symmetry breaking, but it has
interesting consequences. We study the reheating in flipped GUT model. We argue
in favor of $Z_2$ symmetry associated with flipped GUT models to avoid
phenomenologically dangerous operators and allow for decay channels for the
inflaton to right-handed neutrinos (sneutrinos).
| [
{
"created": "Tue, 29 Sep 2020 16:47:36 GMT",
"version": "v1"
},
{
"created": "Fri, 22 Jan 2021 19:46:19 GMT",
"version": "v2"
}
] | 2021-03-17 | [
[
"Moursy",
"Ahmad",
""
]
] | In this paper we provide a no-scale supergravity scenario of hybrid inflation with R-symmetry being broken maximally. We investigate the inflation dynamics in details in both cases of pure F-term hybrid inflation and when adding constant Fayet-Iliopoulos D-terms. The effective inflation potential is asymptotically flat in a region of the parameter space in both cases. We explore all regions in the parameter space when discussing the constraints from the observables. We point out a connection between inflation, R-symmetry breaking and GUT scales. The moduli backreaction and SUSY breaking effects are investigated in a specific stabilization mechanism. We emphasis that a successful reheating is not affected by R-symmetry breaking, but it has interesting consequences. We study the reheating in flipped GUT model. We argue in favor of $Z_2$ symmetry associated with flipped GUT models to avoid phenomenologically dangerous operators and allow for decay channels for the inflaton to right-handed neutrinos (sneutrinos). |
hep-ph/0209233 | Guohuai Zhu | Dongsheng Du, Junfeng Sun, Deshan Yang, Guohuai Zhu | Charmless two-body B decays: A global analysis with QCD factorization | 20 pages, 4 figures, version to appear in Phys. Rev. D | Phys.Rev. D67 (2003) 014023 | 10.1103/PhysRevD.67.014023 | null | hep-ph hep-ex | null | In this paper, we perform a global analysis of $B \to PP$ and $PV$ decays
with the QCD factorization approach. It is encouraging to observe that the
predictions of QCD factorization are in good agreement with experiment. The
best fit $\gamma$ is around $79^\circ$. The penguin-to-tree ratio $|P_{\pi
\pi}/T_{\pi \pi}|$ of $\pi^+ \pi^-$ decays is preferred to be larger than 0.3.
We also show the confidence levels for some interesting channels: $B^0 \to
\pi^0 \pi^0$, $K^+ K^-$ and $B^+ \to \omega \pi^+$, $\omega K^+$. For $B \to
\pi K^\ast$ decays, they are expected to have smaller branching ratios with
more precise measurements.
| [
{
"created": "Fri, 20 Sep 2002 07:51:47 GMT",
"version": "v1"
},
{
"created": "Fri, 15 Nov 2002 08:44:38 GMT",
"version": "v2"
},
{
"created": "Wed, 8 Jan 2003 11:32:39 GMT",
"version": "v3"
}
] | 2009-11-07 | [
[
"Du",
"Dongsheng",
""
],
[
"Sun",
"Junfeng",
""
],
[
"Yang",
"Deshan",
""
],
[
"Zhu",
"Guohuai",
""
]
] | In this paper, we perform a global analysis of $B \to PP$ and $PV$ decays with the QCD factorization approach. It is encouraging to observe that the predictions of QCD factorization are in good agreement with experiment. The best fit $\gamma$ is around $79^\circ$. The penguin-to-tree ratio $|P_{\pi \pi}/T_{\pi \pi}|$ of $\pi^+ \pi^-$ decays is preferred to be larger than 0.3. We also show the confidence levels for some interesting channels: $B^0 \to \pi^0 \pi^0$, $K^+ K^-$ and $B^+ \to \omega \pi^+$, $\omega K^+$. For $B \to \pi K^\ast$ decays, they are expected to have smaller branching ratios with more precise measurements. |
hep-ph/9407342 | null | G. Buchalla and A.J. Buras | Parity Violating Longitudinal Muon Polarization in
$K^+\to\pi^+\mu^+\mu^-$ Beyond Leading Logarithms | 9 pages, MPI-PhT/94-43, TUM-T31-65/94 | Phys.Lett.B336:263-268,1994 | 10.1016/0370-2693(94)00997-X | null | hep-ph | null | We generalize the existing analyses of the parity violating muon polarization
asymmetry $\Delta_{LR}$ in $K^+\to\pi^+\mu^+\mu^-$ beyond the leading
logarithmic approximation. The inclusion of next--to--leading QCD corrections
reduces the residual dependence on the renormalization scales, which is quite
pronounced in the leading order. This leads to a considerably improved accuracy
in the perturbative calculation of the short distance dominated quantity
$\Delta_{LR}$. Accordingly this will also allow to obtain better constraints on
the Wolfenstein parameter $\varrho$ from future measurements of $\Delta_{LR}$.
For $-0.25\leq \varrho \leq 0.25$, $V_{cb}=0.040\pm 0.004$ and $m_t=(170\pm
20)GeV$ we find $3.0\cdot 10^{-3}\leq |\Delta_{LR}|\leq 9.6\cdot 10^{-3}$.
| [
{
"created": "Wed, 20 Jul 1994 20:29:00 GMT",
"version": "v1"
}
] | 2009-10-09 | [
[
"Buchalla",
"G.",
""
],
[
"Buras",
"A. J.",
""
]
] | We generalize the existing analyses of the parity violating muon polarization asymmetry $\Delta_{LR}$ in $K^+\to\pi^+\mu^+\mu^-$ beyond the leading logarithmic approximation. The inclusion of next--to--leading QCD corrections reduces the residual dependence on the renormalization scales, which is quite pronounced in the leading order. This leads to a considerably improved accuracy in the perturbative calculation of the short distance dominated quantity $\Delta_{LR}$. Accordingly this will also allow to obtain better constraints on the Wolfenstein parameter $\varrho$ from future measurements of $\Delta_{LR}$. For $-0.25\leq \varrho \leq 0.25$, $V_{cb}=0.040\pm 0.004$ and $m_t=(170\pm 20)GeV$ we find $3.0\cdot 10^{-3}\leq |\Delta_{LR}|\leq 9.6\cdot 10^{-3}$. |
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