id stringlengths 9 14 | submitter stringlengths 1 56 ⌀ | authors stringlengths 5 7.68k | title stringlengths 3 299 | comments stringlengths 1 1.15k ⌀ | journal-ref stringlengths 9 298 ⌀ | doi stringlengths 12 97 ⌀ | report-no stringlengths 3 341 ⌀ | categories stringclasses 869 values | license stringclasses 9 values | orig_abstract stringlengths 16 2.44k | versions listlengths 1 39 | update_date stringlengths 10 10 | authors_parsed listlengths 1 565 | abstract stringlengths 13 2.44k |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
hep-ph/0602070 | Wolfgang Sch\"afer | N.N. Nikolaev, W. Sch\"afer, B.G. Zakharov, V.R. Zoller | Glue in the pomeron from nonlinear k_\perp-factorization | 9 pages | JETP Lett. 83 (2006) 192-197 | 10.1134/S002136400605002X | FZJ-IKP-TH-2006-4 | hep-ph | null | We derive the nonlinear k_\perp-factorization for the spectrum of jets in
high-mass diffractive deep inelastic scattering as a function of three hard
scales - the virtuality of the photon Q^2, the transverse momentum of the jet
and the saturation scale Q_A. In contrast to all other hard reactions studied
so far, we encounter a clash between the two definitions of the glue in the
pomeron -- from the inclusive spectrum of leading quarks and the small-\beta
evolution of the diffractive cross section. This clash casts a further shadow
on customary applications of the familiar collinear factorization to a pQCD
analysis of diffractive deep inelastic scattering.
| [
{
"created": "Wed, 8 Feb 2006 13:48:28 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Nikolaev",
"N. N.",
""
],
[
"Schäfer",
"W.",
""
],
[
"Zakharov",
"B. G.",
""
],
[
"Zoller",
"V. R.",
""
]
] | We derive the nonlinear k_\perp-factorization for the spectrum of jets in high-mass diffractive deep inelastic scattering as a function of three hard scales - the virtuality of the photon Q^2, the transverse momentum of the jet and the saturation scale Q_A. In contrast to all other hard reactions studied so far, we encounter a clash between the two definitions of the glue in the pomeron -- from the inclusive spectrum of leading quarks and the small-\beta evolution of the diffractive cross section. This clash casts a further shadow on customary applications of the familiar collinear factorization to a pQCD analysis of diffractive deep inelastic scattering. |
0712.4220 | Gong Bin | Bin Gong and Jian-Xiong Wang | QCD corrections to J/psi plus eta_c production in e+e- annihilation at
sqrt{s}=10.6 GeV | 8 pages, 6 figures, two columns | Phys.Rev.D77:054028,2008 | 10.1103/PhysRevD.77.054028 | null | hep-ph | null | Next-to-Leading-Order(NLO) QCD corrections to J/jpsi plus eta_c production in
e+e- annihilation at sqrt{s}=10.6 GeV is calculated in this paper, and an
analytic result is obtained. By choosing proper physical parameters, a K factor
(ratio of NLO to LO) of about 2, which is in agreement with the result in
Ref.\cite{Zhang:2005ch}, is obtained. Our results show that the
Next-Next-to-Leading-Order(NNLO) corrections might be quite large. The plot of
the K-factor vs the center-of-mass energy sqrt{s} shows that it is more
difficult to obtain a convergent result from the perturbative QCD without
resummation of ln(s/m_c) terms as the sqrt{s} becomes larger.
| [
{
"created": "Thu, 27 Dec 2007 11:41:00 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Dec 2007 02:06:53 GMT",
"version": "v2"
},
{
"created": "Tue, 1 Apr 2008 03:41:31 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Gong",
"Bin",
""
],
[
"Wang",
"Jian-Xiong",
""
]
] | Next-to-Leading-Order(NLO) QCD corrections to J/jpsi plus eta_c production in e+e- annihilation at sqrt{s}=10.6 GeV is calculated in this paper, and an analytic result is obtained. By choosing proper physical parameters, a K factor (ratio of NLO to LO) of about 2, which is in agreement with the result in Ref.\cite{Zhang:2005ch}, is obtained. Our results show that the Next-Next-to-Leading-Order(NNLO) corrections might be quite large. The plot of the K-factor vs the center-of-mass energy sqrt{s} shows that it is more difficult to obtain a convergent result from the perturbative QCD without resummation of ln(s/m_c) terms as the sqrt{s} becomes larger. |
0704.2281 | Herbert Weigel | H. Weigel | On the width of collective excitations in chiral soliton models | 8 pages, contribution to the proceedings of YKIS "New frontiers in
QCD", Kyoto, Dec. 2006 | Prog.Theor.Phys.Suppl.168:78-85,2007 | 10.1143/PTPS.168.78 | null | hep-ph | null | In chiral soliton models for baryons the computation of hadronic decay widths
of baryon resonances is a long standing problem. For the three flavor Skyrme
model I present a solution to this problem that satisfies large--$N_C$
consistency conditions. As an application I focus on the hadronic decay of the
$\Theta$ and $\Theta^*$ pentaquarks.
| [
{
"created": "Wed, 18 Apr 2007 07:44:29 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Weigel",
"H.",
""
]
] | In chiral soliton models for baryons the computation of hadronic decay widths of baryon resonances is a long standing problem. For the three flavor Skyrme model I present a solution to this problem that satisfies large--$N_C$ consistency conditions. As an application I focus on the hadronic decay of the $\Theta$ and $\Theta^*$ pentaquarks. |
1608.07274 | Florian Lyonnet | Florian Lyonnet, Ingo Schienbein | PyR@TE 2: A Python tool for computing RGEs at two-loop | 26 pages | null | 10.1016/j.cpc.2016.12.003 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Renormalization group equations are an essential tool for the description of
theories accross different energy scales. Even though their expressions at
two-loop for an arbitrary gauge field theory have been known for more than
thirty years, deriving the full set of equations for a given model by hand is
very challenging and prone to errors. To tackle this issue, we have introduced
in [1] a Python tool called PyR@TE; Python Renormalization group equations @
Two-loop for Everyone. With PyR@TE, it is easy to implement a given Lagrangian
and derive the complete set of two-loop RGEs for all the parameters of the
theory. In this paper, we present the new version of this code, PyR@TE 2, which
brings many new features and in particular it incorporates kinetic mixing when
several $\mathrm{U}(1)$ gauge groups are involved. In addition, the group
theory part has been greatly improved as we introduced a new Python module
dubbed PyLie that deals with all the group theoretical aspects required for the
calculation of the RGEs as well as providing very useful model building
capabilities. This allows the use of any irreducible representation of the
$\mathrm{SU}(n)$, $\mathrm{SO}(2n)$ and $\mathrm{SO(2n+1)}$ groups. %
Furthermore, it is now possible to implement terms in the Lagrangian involving
fields which can be contracted into gauge singlets in more than one way. As a
byproduct, results for a popular model (SM+complex triplet) for which, to our
knowledge, the complete set of two-loop RGEs has not been calculated before are
presented in this paper. Finally, the two-loop RGEs for the anomalous dimension
of the scalar and fermion fields have been implemented as well. It is now
possible to export the coupled system of beta functions into a numerical C++
function, leading to a consequent speed up in solving them.
| [
{
"created": "Thu, 25 Aug 2016 19:54:16 GMT",
"version": "v1"
}
] | 2017-03-08 | [
[
"Lyonnet",
"Florian",
""
],
[
"Schienbein",
"Ingo",
""
]
] | Renormalization group equations are an essential tool for the description of theories accross different energy scales. Even though their expressions at two-loop for an arbitrary gauge field theory have been known for more than thirty years, deriving the full set of equations for a given model by hand is very challenging and prone to errors. To tackle this issue, we have introduced in [1] a Python tool called PyR@TE; Python Renormalization group equations @ Two-loop for Everyone. With PyR@TE, it is easy to implement a given Lagrangian and derive the complete set of two-loop RGEs for all the parameters of the theory. In this paper, we present the new version of this code, PyR@TE 2, which brings many new features and in particular it incorporates kinetic mixing when several $\mathrm{U}(1)$ gauge groups are involved. In addition, the group theory part has been greatly improved as we introduced a new Python module dubbed PyLie that deals with all the group theoretical aspects required for the calculation of the RGEs as well as providing very useful model building capabilities. This allows the use of any irreducible representation of the $\mathrm{SU}(n)$, $\mathrm{SO}(2n)$ and $\mathrm{SO(2n+1)}$ groups. % Furthermore, it is now possible to implement terms in the Lagrangian involving fields which can be contracted into gauge singlets in more than one way. As a byproduct, results for a popular model (SM+complex triplet) for which, to our knowledge, the complete set of two-loop RGEs has not been calculated before are presented in this paper. Finally, the two-loop RGEs for the anomalous dimension of the scalar and fermion fields have been implemented as well. It is now possible to export the coupled system of beta functions into a numerical C++ function, leading to a consequent speed up in solving them. |
2004.04740 | Isabella Masina | Isabella Masina | Dark matter and dark radiation from evaporating primordial black holes | v1: 29 pages, 9 figures; v2: 29 pages, 9 figures, added references;
v3: text improvements, matches published version | null | null | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Primordial black holes in the mass range from $10^{-5}$ to $10^9$ g might
have existed in the early universe. Via their evaporation mechanism (completed
before Big Bang Nucleosynthesis), they might have released stable particles
beyond the Standard Model. We reconsider the possibility that such particles
might constitute the main part or a fraction of the dark matter observed today,
updating the impact on this scenario from warm dark matter constraints. If
sufficiently light, stable particles from primordial black holes evaporation
might also provide a significant contribution to dark radiation. We generalize
previous studies on this interesting dark matter and dark radiation production
mechanism, by including the effects of accretion and a possible amount of
entropy non conservation. We also discuss in some detail specific examples of
stable particle candidates beyond the Standard Model.
| [
{
"created": "Thu, 9 Apr 2020 13:17:14 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Apr 2020 09:30:57 GMT",
"version": "v2"
},
{
"created": "Thu, 17 Dec 2020 09:12:11 GMT",
"version": "v3"
}
] | 2020-12-18 | [
[
"Masina",
"Isabella",
""
]
] | Primordial black holes in the mass range from $10^{-5}$ to $10^9$ g might have existed in the early universe. Via their evaporation mechanism (completed before Big Bang Nucleosynthesis), they might have released stable particles beyond the Standard Model. We reconsider the possibility that such particles might constitute the main part or a fraction of the dark matter observed today, updating the impact on this scenario from warm dark matter constraints. If sufficiently light, stable particles from primordial black holes evaporation might also provide a significant contribution to dark radiation. We generalize previous studies on this interesting dark matter and dark radiation production mechanism, by including the effects of accretion and a possible amount of entropy non conservation. We also discuss in some detail specific examples of stable particle candidates beyond the Standard Model. |
hep-ph/0112352 | Peter Post | P. Post, K. Schilcher | K_l3 form factors at order p^6 in chiral perturbation theory | 32 pages, 7 figures | Eur.Phys.J.C25:427-443,2002 | 10.1007/s10052-002-0967-1 | MZ-TH-01-39 | hep-ph | null | This paper describes the calculation of the semileptonic K_l3 decay form
factor at order p^6 of chiral perturbation theory which is the next-to-leading
order correction to the well-known p^4 result achieved by Gasser and Leutwyler.
At order p^6 the chiral expansion contains 1- and 2-loop diagrams which are
discussed in detail. The irreducible 2-loop graphs of the sunset topology are
calculated numerically. In addition, the chiral Lagrangian L^6 produces direct
couplings with the W-bosons. Due to these unknown couplings, one can always add
linear terms in q^2 to the predictions of the form factor f_-(q^2). For the
form factor f_+(q^2), this ambiguity involves even quadratic terms. Making use
of the fact that the pion electromagnetic form factor involves the same q^4
counter term, the q^4-ambiguity can be resolved. Apart from the possibility of
adding an arbitrary linear term in q^2 our calculation shows that chiral
perturbation theory converges very well in this application, as the O(p^6)
corrections are small. Comparing the predictions of chiral perturbation theory
with the recent CPLEAR data, it is seen that the experimental form factor
f_+(q^2) is well described by a linear fit, but that the slope lambda_+ is
smaller by about 2 standard deviations than the O(p^4) prediction. The
unavoidable q^2 counter term of the O(p^6) corrections allows to bring the
predictions of chiral perturbation theory into perfect agreement with
experiment.
| [
{
"created": "Fri, 28 Dec 2001 17:04:33 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Jan 2002 14:32:57 GMT",
"version": "v2"
},
{
"created": "Wed, 27 Mar 2002 10:21:48 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Post",
"P.",
""
],
[
"Schilcher",
"K.",
""
]
] | This paper describes the calculation of the semileptonic K_l3 decay form factor at order p^6 of chiral perturbation theory which is the next-to-leading order correction to the well-known p^4 result achieved by Gasser and Leutwyler. At order p^6 the chiral expansion contains 1- and 2-loop diagrams which are discussed in detail. The irreducible 2-loop graphs of the sunset topology are calculated numerically. In addition, the chiral Lagrangian L^6 produces direct couplings with the W-bosons. Due to these unknown couplings, one can always add linear terms in q^2 to the predictions of the form factor f_-(q^2). For the form factor f_+(q^2), this ambiguity involves even quadratic terms. Making use of the fact that the pion electromagnetic form factor involves the same q^4 counter term, the q^4-ambiguity can be resolved. Apart from the possibility of adding an arbitrary linear term in q^2 our calculation shows that chiral perturbation theory converges very well in this application, as the O(p^6) corrections are small. Comparing the predictions of chiral perturbation theory with the recent CPLEAR data, it is seen that the experimental form factor f_+(q^2) is well described by a linear fit, but that the slope lambda_+ is smaller by about 2 standard deviations than the O(p^4) prediction. The unavoidable q^2 counter term of the O(p^6) corrections allows to bring the predictions of chiral perturbation theory into perfect agreement with experiment. |
1707.08014 | Eugenio Megias | Eugenio Megias, Mariano Quiros, Lindber Salas | Lepton-flavor universality limits in warped space | 6 pages, 4 figures; v2 added references, improved discussion | Phys. Rev. D 96, 075030 (2017) | 10.1103/PhysRevD.96.075030 | UAB-FT-774 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore the limits on lepton-flavor universality (LFU) violation in
theories where the hierarchy problem is solved by means of a warped extra
dimension. In those theories LFU violation, in fermion interaction with
Kaluza-Klein modes of gauge bosons, is provided ab initio when different flavor
of fermions are differently localized along the extra dimension. As this fact
arises from the mass pattern of quarks and leptons, LFU violation is natural in
this class of theories. We analyze the experimental data pointing towards LFU
violation, as well as the most relevant electroweak and flavor observables, and
the LFU tests in the $\mu/e$ and $\tau/\mu$ sectors. We find agreement with
$R_{K^{(\ast)}}$ and $R_{D^{(\ast)}}$ data at 95% CL, provided the third
generation left-handed fermions are composite ($0.14 < c_{b_L} < 0.28$ and
$0.27 < c_{\tau_L} < 0.33$), and find the absolute limits
$R_{K^{(\ast)}}\gtrsim 0.79$ and $R_{D^{(\ast)}}/R_{D^{(\ast)}}^{\rm
SM}\lesssim 1.13$. Moreover we predict $\mathcal B( B\to K\nu\bar\nu)\gtrsim
1.14\times 10^{-5}$ at 95% CL, smaller than the present experimental upper
bound but a few times larger than the Standard Model prediction.
| [
{
"created": "Tue, 25 Jul 2017 14:37:23 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Aug 2017 15:18:25 GMT",
"version": "v2"
}
] | 2017-11-01 | [
[
"Megias",
"Eugenio",
""
],
[
"Quiros",
"Mariano",
""
],
[
"Salas",
"Lindber",
""
]
] | We explore the limits on lepton-flavor universality (LFU) violation in theories where the hierarchy problem is solved by means of a warped extra dimension. In those theories LFU violation, in fermion interaction with Kaluza-Klein modes of gauge bosons, is provided ab initio when different flavor of fermions are differently localized along the extra dimension. As this fact arises from the mass pattern of quarks and leptons, LFU violation is natural in this class of theories. We analyze the experimental data pointing towards LFU violation, as well as the most relevant electroweak and flavor observables, and the LFU tests in the $\mu/e$ and $\tau/\mu$ sectors. We find agreement with $R_{K^{(\ast)}}$ and $R_{D^{(\ast)}}$ data at 95% CL, provided the third generation left-handed fermions are composite ($0.14 < c_{b_L} < 0.28$ and $0.27 < c_{\tau_L} < 0.33$), and find the absolute limits $R_{K^{(\ast)}}\gtrsim 0.79$ and $R_{D^{(\ast)}}/R_{D^{(\ast)}}^{\rm SM}\lesssim 1.13$. Moreover we predict $\mathcal B( B\to K\nu\bar\nu)\gtrsim 1.14\times 10^{-5}$ at 95% CL, smaller than the present experimental upper bound but a few times larger than the Standard Model prediction. |
1009.5191 | Eef van Beveren | Eef van Beveren and George Rupp | Observation of a hadronic interference effect in annihilation processes | plain LaTeX, 4 pages, 4 figures | null | null | null | hep-ph hep-ex hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present evidence for small oscillations we observe in electron-positron
and proton-antiproton annihilation data, with a periodicity of 76+-2 MeV,
independent of the beam energy. We discuss some possible scenarios to explain
the phenomenon.
| [
{
"created": "Mon, 27 Sep 2010 09:03:32 GMT",
"version": "v1"
}
] | 2010-09-28 | [
[
"van Beveren",
"Eef",
""
],
[
"Rupp",
"George",
""
]
] | We present evidence for small oscillations we observe in electron-positron and proton-antiproton annihilation data, with a periodicity of 76+-2 MeV, independent of the beam energy. We discuss some possible scenarios to explain the phenomenon. |
1806.03989 | Anderson Kohara | A. K. Kohara, E. Ferreira, T. Kodama and M. Rangel | pp forward elastic scattering amplitudes at 7 and 8 TeV | 2 tables, 2 figures. Poster presented at the XIV International
Workshop on Hadron Physics, Florianopolis, Brazil, March 2018. arXiv admin
note: text overlap with arXiv:1710.09862 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyse the recent LHC data at 7 and 8 TeV for pp elastic scattering with
special attention for the structure of the real part, which is shown to be
crucial to describe the differential cross section in the forward region. We
determine accurately the position of the zero of the real amplitude, which
corresponds to the zero of a theorem by A. Martin.
| [
{
"created": "Thu, 7 Jun 2018 18:54:18 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Jul 2018 13:57:09 GMT",
"version": "v2"
}
] | 2018-07-05 | [
[
"Kohara",
"A. K.",
""
],
[
"Ferreira",
"E.",
""
],
[
"Kodama",
"T.",
""
],
[
"Rangel",
"M.",
""
]
] | We analyse the recent LHC data at 7 and 8 TeV for pp elastic scattering with special attention for the structure of the real part, which is shown to be crucial to describe the differential cross section in the forward region. We determine accurately the position of the zero of the real amplitude, which corresponds to the zero of a theorem by A. Martin. |
1201.0123 | Bernard Pire | B. Pire, K. Semenov-Tian-Shansky and L. Szymanowski | Cross section and single transverse target spin asymmetry for backward
pion electroproduction | 6 pages, 3 figures, proceedings of the XIV Advanced Research Workshop
on High Energy Spin Physics, Dubna, sept.20-24, 2011 (DSPIN-11) | null | null | null | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Nucleon to meson transition distribution amplitudes (TDAs), non-diagonal
matrix elements of nonlocal three quark operators between a nucleon and a meson
states, arise within the collinear factorized description of hard exclusive
electroproduction of mesons off nucleons in the backward direction. Below we
address the problem of modelling pion to nucleon TDAs. We suggest a factorized
Ansatz for quadruple distributions with input from the soft pion theorem for pi
N TDAs. In order to satisfy the polynomiality property in its full form the
spectral representation is complemented with a D-term like contribution from
the nucleon exchange in the u-channel of the reaction. We present our estimates
for the backward pion electroproduction unpolarized cross section and its
transverse target single spin asymmetry within our composite model for pi N
TDAs.
| [
{
"created": "Fri, 30 Dec 2011 13:21:22 GMT",
"version": "v1"
}
] | 2012-01-04 | [
[
"Pire",
"B.",
""
],
[
"Semenov-Tian-Shansky",
"K.",
""
],
[
"Szymanowski",
"L.",
""
]
] | Nucleon to meson transition distribution amplitudes (TDAs), non-diagonal matrix elements of nonlocal three quark operators between a nucleon and a meson states, arise within the collinear factorized description of hard exclusive electroproduction of mesons off nucleons in the backward direction. Below we address the problem of modelling pion to nucleon TDAs. We suggest a factorized Ansatz for quadruple distributions with input from the soft pion theorem for pi N TDAs. In order to satisfy the polynomiality property in its full form the spectral representation is complemented with a D-term like contribution from the nucleon exchange in the u-channel of the reaction. We present our estimates for the backward pion electroproduction unpolarized cross section and its transverse target single spin asymmetry within our composite model for pi N TDAs. |
hep-ph/0011344 | Rudolf Faustov | R.N.Faustov, A.P.Martynenko | Magnetic moment of the two-particle bound state in quantum
electrodynamics | Talk presented at Nuclear Physics Department Conference "Physics of
Fundamental Interactions" Russian Academy of Sciences, ITEP, Moscow, 27
November-1 December 2000. 11 pages, 1 figure uses linedraw.sty | Phys.Atom.Nucl.65:271-276,2002; Yad.Fiz.65:297-302,2002 | 10.1134/1.1451941 | SSU-HEP-00/09 | hep-ph | null | We have formulated the quasipotential method for the calculation of the
relativistic and radiative corrections to the magnetic moment of the
two-particle bound state in the case of particles with arbitrary spin. It is
shown that the g-factors of bound particles contain $O(\alpha^2)$ terms
depending on the particle spin. Numerical values for the g-factors of the
electron in the hydrogen atom and deuterium are obtained.
| [
{
"created": "Tue, 28 Nov 2000 13:50:54 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Nov 2000 06:09:13 GMT",
"version": "v2"
},
{
"created": "Mon, 4 Dec 2000 04:35:26 GMT",
"version": "v3"
}
] | 2014-11-17 | [
[
"Faustov",
"R. N.",
""
],
[
"Martynenko",
"A. P.",
""
]
] | We have formulated the quasipotential method for the calculation of the relativistic and radiative corrections to the magnetic moment of the two-particle bound state in the case of particles with arbitrary spin. It is shown that the g-factors of bound particles contain $O(\alpha^2)$ terms depending on the particle spin. Numerical values for the g-factors of the electron in the hydrogen atom and deuterium are obtained. |
2012.11408 | Sabine Kraml | Marius Bertrand, Sabine Kraml, Tran Quang Loc, Dao Thi Nhung and Le
Duc Ninh | Constraining new physics from Higgs measurements with Lilith-2 | 12 pages, 7 figures. Contribution to "Tools for High Energy Physics
and Cosmology" (TOOLS2020), 2-6 Nov. 2020, IP2I Lyon, France | null | null | IFIRSE-TH-2020-3 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Lilith is a public Python library for constraining new physics from Higgs
signal strength measurements. Version 2.0 of Lilith comes with an extensive XML
database which includes the ATLAS and CMS Run 2 Higgs results for 36/fb, in
addition the the Run 1 results. Both the code and the database were extended
from the ordinary Gaussian approximation employed in Lilith-1.1 to using
variable Gaussian and Poisson likelihoods. Moreover, Lilith-2 can make use of
correlation matrices of arbitrary dimension. We will report on these novelties
and ongoing developments. The importance of how correlations and uncertainties
are treated will be demonstrated by means of detailed validations of the
implemented experimental results. Moreover, we show the effects for global fits
of reduced Higgs couplings, 2HDMs of Type I and Type II, and invisible Higgs
decays. The program is publicly available on GitHub and can be used to
constrain a wide class of new physics scenarios.
| [
{
"created": "Mon, 21 Dec 2020 15:12:07 GMT",
"version": "v1"
}
] | 2020-12-22 | [
[
"Bertrand",
"Marius",
""
],
[
"Kraml",
"Sabine",
""
],
[
"Loc",
"Tran Quang",
""
],
[
"Nhung",
"Dao Thi",
""
],
[
"Ninh",
"Le Duc",
""
]
] | Lilith is a public Python library for constraining new physics from Higgs signal strength measurements. Version 2.0 of Lilith comes with an extensive XML database which includes the ATLAS and CMS Run 2 Higgs results for 36/fb, in addition the the Run 1 results. Both the code and the database were extended from the ordinary Gaussian approximation employed in Lilith-1.1 to using variable Gaussian and Poisson likelihoods. Moreover, Lilith-2 can make use of correlation matrices of arbitrary dimension. We will report on these novelties and ongoing developments. The importance of how correlations and uncertainties are treated will be demonstrated by means of detailed validations of the implemented experimental results. Moreover, we show the effects for global fits of reduced Higgs couplings, 2HDMs of Type I and Type II, and invisible Higgs decays. The program is publicly available on GitHub and can be used to constrain a wide class of new physics scenarios. |
hep-ph/0107089 | Wan Lang-Hui | Wan Lang-Hui, Ma Wen-Gan, Zhang Ren-You, and Jiang Yi | Electroweak Corrections to the Charged Higgs Boson Decay into Chargino
and Neutralino | 21 pages, 6 eps figures, 1 Latex file | Phys.Rev. D64 (2001) 115004 | 10.1103/PhysRevD.64.115004 | null | hep-ph | null | The electroweak corrections to the partial widths of the $H^+ \to
\tilde{\chi}^+_i \tilde{\chi}_j^0 (i=1,j=1,2)$ decays including one-loop
diagrams of the third generation quarks and squarks, are investigated within
the Supersymmetric Standard Model. The relative corrections can reach the
values about 10%, therefore they should be taken into account for the precise
experimental measurement at future colliders.
| [
{
"created": "Mon, 9 Jul 2001 13:26:59 GMT",
"version": "v1"
}
] | 2019-08-17 | [
[
"Lang-Hui",
"Wan",
""
],
[
"Wen-Gan",
"Ma",
""
],
[
"Ren-You",
"Zhang",
""
],
[
"Yi",
"Jiang",
""
]
] | The electroweak corrections to the partial widths of the $H^+ \to \tilde{\chi}^+_i \tilde{\chi}_j^0 (i=1,j=1,2)$ decays including one-loop diagrams of the third generation quarks and squarks, are investigated within the Supersymmetric Standard Model. The relative corrections can reach the values about 10%, therefore they should be taken into account for the precise experimental measurement at future colliders. |
hep-ph/9701364 | Stefan Kretzer | M. Gluck, S. Kretzer and E. Reya (Univ. Dortmund) | Detailed Next-to-Leading Order Analysis of Deep Inelastic Neutrino
Induced Charm Production off Strange Sea Partons | 15 pages, LaTeX, 4 figures, uses epsfig style, typo corrected in
eq.(A9) | Phys.Lett. B398 (1997) 381-386; Erratum-ibid. B405 (1997) 392 | 10.1016/S0370-2693(97)00232-3 | DO-TH 97/01 | hep-ph | null | Neutrino induced deep inelastic charm production off strange sea partons in
the nucleon is studied in the framework of the MSbar fixed flavor factorization
scheme. The momentum (z) distributions of the produced D mesons as calculated
in the next-to-leading order QCD analysis are presented and compared to their
leading order counterparts. Perturbative stability within this formalism is
demonstrated and the compatibility of recent next-to-leading order (NLO)
strange quark distributions with available dimuon data is investigated. Our NLO
(MSbar) results provide, for the first time, the tools required for a
consistent and complete NLO (MSbar) analysis of charged current dimuon data in
order to extract the strange sea density in NLO. It is furthermore shown that
the absolute predictions of radiatively (dynamically) generated strange sea
densities are in agreement with all present measurements.
| [
{
"created": "Fri, 24 Jan 1997 12:17:11 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Jan 1997 16:06:06 GMT",
"version": "v2"
}
] | 2009-10-30 | [
[
"Gluck",
"M.",
"",
"Univ. Dortmund"
],
[
"Kretzer",
"S.",
"",
"Univ. Dortmund"
],
[
"Reya",
"E.",
"",
"Univ. Dortmund"
]
] | Neutrino induced deep inelastic charm production off strange sea partons in the nucleon is studied in the framework of the MSbar fixed flavor factorization scheme. The momentum (z) distributions of the produced D mesons as calculated in the next-to-leading order QCD analysis are presented and compared to their leading order counterparts. Perturbative stability within this formalism is demonstrated and the compatibility of recent next-to-leading order (NLO) strange quark distributions with available dimuon data is investigated. Our NLO (MSbar) results provide, for the first time, the tools required for a consistent and complete NLO (MSbar) analysis of charged current dimuon data in order to extract the strange sea density in NLO. It is furthermore shown that the absolute predictions of radiatively (dynamically) generated strange sea densities are in agreement with all present measurements. |
2105.09330 | Dean Robinson | Michele Papucci, Dean J. Robinson | Form Factor Counting and HQET Matching for New Physics in $\Lambda_b \to
\Lambda_c^*l\nu$ | 17 pages, 3 figures, published version | null | 10.1103/PhysRevD.105.016027 | CALT-2021-020 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the $\Lambda_b \to \Lambda_c^*(2595) l \nu$ and $\Lambda_b \to
\Lambda_c^*(2625) l \nu$ form factors and decay rates for all possible $b \to c
l \bar\nu$ four-Fermi interactions in and beyond the Standard Model (SM),
including nonzero charged lepton masses and terms up to order
$\mathcal{O}(\alpha_s, 1/m_{c,b})$ in the heavy quark effective theory (HQET).
We point out a subtlety involving the overcompleteness of the representation of
the spin-parity $1/2^+ \to 3/2^-$ antisymmetric tensor form factors, relevant
also to other higher excited-state transitions, and present a general method
for the counting of the physical form factors for any hadronic transition
matrix element and their matching onto HQET. We perform a preliminary fit of a
simple HQET-based parametrization of the $\Lambda_b \to \Lambda_c^*$ form
factors at $\mathcal{O}(\alpha_s, 1/m_{c,b})$ to an existing quark model,
providing preliminary predictions for the lepton universality ratios
$R(\Lambda_c^*)$ beyond the SM. Finally, we examine the possible
incompatibility of recent lattice QCD results with expectations from the
heavy-quark expansion and available experimental data.
| [
{
"created": "Wed, 19 May 2021 18:00:05 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Mar 2022 18:46:21 GMT",
"version": "v2"
}
] | 2022-03-07 | [
[
"Papucci",
"Michele",
""
],
[
"Robinson",
"Dean J.",
""
]
] | We calculate the $\Lambda_b \to \Lambda_c^*(2595) l \nu$ and $\Lambda_b \to \Lambda_c^*(2625) l \nu$ form factors and decay rates for all possible $b \to c l \bar\nu$ four-Fermi interactions in and beyond the Standard Model (SM), including nonzero charged lepton masses and terms up to order $\mathcal{O}(\alpha_s, 1/m_{c,b})$ in the heavy quark effective theory (HQET). We point out a subtlety involving the overcompleteness of the representation of the spin-parity $1/2^+ \to 3/2^-$ antisymmetric tensor form factors, relevant also to other higher excited-state transitions, and present a general method for the counting of the physical form factors for any hadronic transition matrix element and their matching onto HQET. We perform a preliminary fit of a simple HQET-based parametrization of the $\Lambda_b \to \Lambda_c^*$ form factors at $\mathcal{O}(\alpha_s, 1/m_{c,b})$ to an existing quark model, providing preliminary predictions for the lepton universality ratios $R(\Lambda_c^*)$ beyond the SM. Finally, we examine the possible incompatibility of recent lattice QCD results with expectations from the heavy-quark expansion and available experimental data. |
hep-ph/0102088 | John W. Moffat | J. W. Moffat | Quantum Gravity Resolution to the Cosmological Constant Problem | 20 pages. Latex file. No figures. Additional clarifying text | null | null | null | hep-ph astro-ph gr-qc hep-th | null | A finite quantum gravity theory is used to resolve the cosmological constant
problem. A fundamental quantum gravity scale, \Lambda_G \leq 10^{-3} eV, is
introduced above which the quantum corrections to the vacuum energy density
coupled to gravity are exponentially suppressed by a graviton vertex form
factor, yielding an observationally acceptable value for the particle physics
contribution to the cosmological constant. Classical Einstein gravity retains
its causal behavior as well as the standard agreement with observational data.
| [
{
"created": "Wed, 7 Feb 2001 23:50:42 GMT",
"version": "v1"
},
{
"created": "Sun, 7 Apr 2002 21:58:04 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Moffat",
"J. W.",
""
]
] | A finite quantum gravity theory is used to resolve the cosmological constant problem. A fundamental quantum gravity scale, \Lambda_G \leq 10^{-3} eV, is introduced above which the quantum corrections to the vacuum energy density coupled to gravity are exponentially suppressed by a graviton vertex form factor, yielding an observationally acceptable value for the particle physics contribution to the cosmological constant. Classical Einstein gravity retains its causal behavior as well as the standard agreement with observational data. |
2303.03285 | Sungsik Noh | Sungsik Noh, Woosung Park | Observation of $T_{cc}$ and a quark model | 5 pages, 4 figures | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | The recent discovery of the doubly charmed tetraquark $T_{cc}$
($\bar{u}\bar{d}cc$) provides a stringent constraint on its binding energy
relative to its lowest decay threshold. We use a fully convergent spatial wave
function and perform a simultaneous global fit to both the meson and baryon
spectra. Our analysis shows that a Yukawa type hyperfine potential leads to a
slight bound state for $T_{cc}$ with $(I,S) = (0,1)$ below its lowest
threshold, in agreement with recent experimental findings. We also find that
$T_{cc}$ is highly likely to be in a compact configuration.
| [
{
"created": "Mon, 6 Mar 2023 17:00:18 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Mar 2023 08:55:48 GMT",
"version": "v2"
}
] | 2023-03-08 | [
[
"Noh",
"Sungsik",
""
],
[
"Park",
"Woosung",
""
]
] | The recent discovery of the doubly charmed tetraquark $T_{cc}$ ($\bar{u}\bar{d}cc$) provides a stringent constraint on its binding energy relative to its lowest decay threshold. We use a fully convergent spatial wave function and perform a simultaneous global fit to both the meson and baryon spectra. Our analysis shows that a Yukawa type hyperfine potential leads to a slight bound state for $T_{cc}$ with $(I,S) = (0,1)$ below its lowest threshold, in agreement with recent experimental findings. We also find that $T_{cc}$ is highly likely to be in a compact configuration. |
1008.0951 | Andreas Vogt | N.A. Lo Presti, H. Kawamura (Liverpool U., Dept. Math.), S. Moch
(DESY, Zeuthen) and A. Vogt (Liverpool U., Dept. Math.) | Threshold-improved predictions for charm production in deep-inelastic
scattering | 6 pages, LaTeX (PoS style), 3 eps-figures. Presented by N.A.L.P. at
DIS 2001, Florence (Italy), April 2010. To appear in the proceedings | PoS DIS2010:163,2010 | null | LTH 879, DESY 10-118 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have extended previous results on the threshold expansion of the gluon
coefficient function for the charm contribution to the deep-inelastic structure
function F_2 by deriving all threshold-enhanced contributions at the
next-to-next-to-leading order. The size of these corrections is briefly
illustrated, and a first step towards extending this improvement to more
differential charm-production cross sections is presented.
| [
{
"created": "Thu, 5 Aug 2010 11:45:02 GMT",
"version": "v1"
}
] | 2010-11-19 | [
[
"Presti",
"N. A. Lo",
"",
"Liverpool U., Dept. Math."
],
[
"Kawamura",
"H.",
"",
"Liverpool U., Dept. Math."
],
[
"Moch",
"S.",
"",
"DESY, Zeuthen"
],
[
"Vogt",
"A.",
"",
"Liverpool U., Dept. Math."
]
] | We have extended previous results on the threshold expansion of the gluon coefficient function for the charm contribution to the deep-inelastic structure function F_2 by deriving all threshold-enhanced contributions at the next-to-next-to-leading order. The size of these corrections is briefly illustrated, and a first step towards extending this improvement to more differential charm-production cross sections is presented. |
1503.03495 | Marco Radici | Marco Radici, A. Courtoy, Alessandro Bacchetta, Marco Guagnelli | Realistic estimate of valence transversity distributions from inclusive
dihadron production | 24 pages, 11 figures of which 7 have two panels; figs. 8a,8b,9a,9b
updated with latest results from Ref.[5]; JHEP style file provided | null | null | null | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present an updated extraction of the transversity parton distribution
based on the analysis of pion-pair production in deep-inelastic scattering off
transversely polarized targets in collinear factorization. Data for proton and
deuteron targets make it possible to perform a flavor separation of the valence
components of the transversity distribution, using di-hadron fragmentation
functions taken from the semi-inclusive production of two pion pairs in
back-to-back jets in e+e- annihilation. The e+e- data from Belle have been
reanalyzed using the replica method and a more realistic estimate of the
uncertainties on the chiral-odd interference fragmentation function has been
obtained. Then, the transversity distribution has been extracted by using the
most recent and more precise COMPASS data for deep-inelastic scattering off
proton targets. Our results represent the most accurate estimate of the
uncertainties on the valence components of the transversity distribution
currently available.
| [
{
"created": "Wed, 11 Mar 2015 20:32:30 GMT",
"version": "v1"
},
{
"created": "Fri, 20 Mar 2015 18:16:41 GMT",
"version": "v2"
}
] | 2015-03-23 | [
[
"Radici",
"Marco",
""
],
[
"Courtoy",
"A.",
""
],
[
"Bacchetta",
"Alessandro",
""
],
[
"Guagnelli",
"Marco",
""
]
] | We present an updated extraction of the transversity parton distribution based on the analysis of pion-pair production in deep-inelastic scattering off transversely polarized targets in collinear factorization. Data for proton and deuteron targets make it possible to perform a flavor separation of the valence components of the transversity distribution, using di-hadron fragmentation functions taken from the semi-inclusive production of two pion pairs in back-to-back jets in e+e- annihilation. The e+e- data from Belle have been reanalyzed using the replica method and a more realistic estimate of the uncertainties on the chiral-odd interference fragmentation function has been obtained. Then, the transversity distribution has been extracted by using the most recent and more precise COMPASS data for deep-inelastic scattering off proton targets. Our results represent the most accurate estimate of the uncertainties on the valence components of the transversity distribution currently available. |
1509.06734 | Fabrizio Caola | Fabrizio Caola, Kirill Melnikov, Raoul R\"ontsch and Lorenzo Tancredi | QCD corrections to ZZ production in gluon fusion at the LHC | 18 pages, 2 tables, 3 figures | Phys. Rev. D 92, 094028 (2015) | 10.1103/PhysRevD.92.094028 | TTP15-035, CERN-PH-TH-2015-226, FERMILAB-PUB-15-398-T | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute the next-to-leading order QCD corrections to the production of two
Z-bosons in the annihilation of two gluons at the LHC. Being enhanced by a
large gluon flux, these corrections provide distinct and, potentially, the
dominant part of the N$^3$LO QCD contributions to Z-pair production in proton
collisions. The $gg \to ZZ$ annihilation is a loop-induced process that
receives the dominant contribution from loops of five light quarks, that are
included in our computation in the massless approximation. We find that QCD
corrections increase the $gg \to ZZ$ production cross section by ${\cal
O}(50\%-100\%)$ depending on the values of the renormalization and
factorization scales used in the leading order computation, and the collider
energy. The large corrections to $gg \to ZZ$ channel increase the $pp \to ZZ$
cross section by about six to eight percent, exceeding the estimated
theoretical uncertainty of the recent NNLO QCD calculation.
| [
{
"created": "Tue, 22 Sep 2015 19:18:19 GMT",
"version": "v1"
}
] | 2015-12-02 | [
[
"Caola",
"Fabrizio",
""
],
[
"Melnikov",
"Kirill",
""
],
[
"Röntsch",
"Raoul",
""
],
[
"Tancredi",
"Lorenzo",
""
]
] | We compute the next-to-leading order QCD corrections to the production of two Z-bosons in the annihilation of two gluons at the LHC. Being enhanced by a large gluon flux, these corrections provide distinct and, potentially, the dominant part of the N$^3$LO QCD contributions to Z-pair production in proton collisions. The $gg \to ZZ$ annihilation is a loop-induced process that receives the dominant contribution from loops of five light quarks, that are included in our computation in the massless approximation. We find that QCD corrections increase the $gg \to ZZ$ production cross section by ${\cal O}(50\%-100\%)$ depending on the values of the renormalization and factorization scales used in the leading order computation, and the collider energy. The large corrections to $gg \to ZZ$ channel increase the $pp \to ZZ$ cross section by about six to eight percent, exceeding the estimated theoretical uncertainty of the recent NNLO QCD calculation. |
2212.04269 | Xiang-Peng Wang | Xiang-Peng Wang | QCD static force in gradient flow | 8 pages, 5 figures, Confinement XV. arXiv admin note: substantial
text overlap with arXiv:2111.07811 | null | 10.1051/epjconf/202227404009 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review our recent study on the QCD static force using gradient flow at
next-to-leading order in the strong coupling. The QCD static force has the
advantage of being free of the $O(\Lambda_{\text{QCD}})$ renormalon appearing
in the static potential but suffers from poor convergence in the lattice QCD
computations. It is expected that the gradient flow formalism can improve the
convergence. Based on our next-to-leading-order calculations, we explore the
properties of the static force for arbitrary flow time $t$, as well as in the
limit $t\rightarrow 0$, which may be useful for lattice QCD simulations.
| [
{
"created": "Thu, 8 Dec 2022 13:50:24 GMT",
"version": "v1"
}
] | 2023-01-11 | [
[
"Wang",
"Xiang-Peng",
""
]
] | We review our recent study on the QCD static force using gradient flow at next-to-leading order in the strong coupling. The QCD static force has the advantage of being free of the $O(\Lambda_{\text{QCD}})$ renormalon appearing in the static potential but suffers from poor convergence in the lattice QCD computations. It is expected that the gradient flow formalism can improve the convergence. Based on our next-to-leading-order calculations, we explore the properties of the static force for arbitrary flow time $t$, as well as in the limit $t\rightarrow 0$, which may be useful for lattice QCD simulations. |
1012.2748 | Julien Baglio | Julien Baglio and Abdelhak Djouadi | Revisiting the constraints on the Supersymmetric Higgs sector at the
Tevatron | 10 pages, 2 tables, 3 figures. Version to appear in Physics Letter B | Phys.Lett.B699:372-376,2011 | 10.1016/j.physletb.2011.04.040 | CERN-PH-TH/2010-296, LPT Orsay 10-96 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the production of the neutral Higgs particles of the Minimal
Supersymmetric extension of the Standard Model at the Fermilab Tevatron
collider. We consider the two main production and detection channels:
gluon--gluon and bottom quark fusion leading to Higgs bosons which subsequently
decay into tau leptons, $gg, b\bar b \to {\rm Higgs} \to \tau^+\tau^-$. We
update the production cross sections and the decay branching ratios and obtain
production rates that are significantly smaller at high masses than the ones
used by the CDF and D0 experiments in their search. We then evaluate the
various theoretical uncertainties that affect these rates, uncertainties that
have not been been considered in the experimental analyses and which turn out
to be rather large. Including these two effects will significantly loosen the
constraints obtained on the supersymmetric Higgs sector at the Tevatron.
| [
{
"created": "Mon, 13 Dec 2010 14:55:09 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Apr 2011 16:58:42 GMT",
"version": "v2"
}
] | 2011-05-11 | [
[
"Baglio",
"Julien",
""
],
[
"Djouadi",
"Abdelhak",
""
]
] | We analyze the production of the neutral Higgs particles of the Minimal Supersymmetric extension of the Standard Model at the Fermilab Tevatron collider. We consider the two main production and detection channels: gluon--gluon and bottom quark fusion leading to Higgs bosons which subsequently decay into tau leptons, $gg, b\bar b \to {\rm Higgs} \to \tau^+\tau^-$. We update the production cross sections and the decay branching ratios and obtain production rates that are significantly smaller at high masses than the ones used by the CDF and D0 experiments in their search. We then evaluate the various theoretical uncertainties that affect these rates, uncertainties that have not been been considered in the experimental analyses and which turn out to be rather large. Including these two effects will significantly loosen the constraints obtained on the supersymmetric Higgs sector at the Tevatron. |
0908.3530 | Masahiro Ibe | Masahiro Ibe, Hitoshi Murayama, Satoshi Shirai, Tsutomu T. Yanagida | Cosmic Ray Spectra in Nambu-Goldstone Dark Matter Models | 16 pages, 4 figures | JHEP 0911:120,2009 | 10.1088/1126-6708/2009/11/120 | SLAC-PUB-13688 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the cosmic ray spectra in annihilating/decaying Nambu-Goldstone
dark matter models. The recent observed positron/electron excesses at PAMELA
and Fermi experiments are well fitted by the dark matter with a mass of 3TeV
for the annihilating model, while with a mass of 6 TeV for the decaying model.
We also show that the Nambu-Goldstone dark matter models predict a distinctive
gamma-ray spectrum in a certain parameter space.
| [
{
"created": "Tue, 25 Aug 2009 03:33:26 GMT",
"version": "v1"
}
] | 2009-12-04 | [
[
"Ibe",
"Masahiro",
""
],
[
"Murayama",
"Hitoshi",
""
],
[
"Shirai",
"Satoshi",
""
],
[
"Yanagida",
"Tsutomu T.",
""
]
] | We discuss the cosmic ray spectra in annihilating/decaying Nambu-Goldstone dark matter models. The recent observed positron/electron excesses at PAMELA and Fermi experiments are well fitted by the dark matter with a mass of 3TeV for the annihilating model, while with a mass of 6 TeV for the decaying model. We also show that the Nambu-Goldstone dark matter models predict a distinctive gamma-ray spectrum in a certain parameter space. |
1405.0443 | Andrey Grabovsky | I. Balitsky and A. V. Grabovsky | NLO evolution of 3-quark Wilson loop operator | null | null | 10.1007/JHEP01(2015)009 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is well known that high-energy scattering of a meson from some hadronic
target can be described by the interaction of that target with a color dipole
formed by two Wilson lines corresponding to fast quark-antiquark pair.
Moreover, the energy dependence of the scattering amplitude is governed by the
evolution equation of this color dipole with respect to rapidity. Similarly,
the energy dependence of scattering of a baryon can be described in terms of
evolution of a three-Wilson-lines operator with respect to the rapidity of the
Wilson lines. We calculate the evolution of the 3-quark Wilson loop operator in
the next-to-leading order (NLO) and present a quasi-conformal evolution
equation for a composite 3-Wilson-lines operator. We also obtain the linearized
version of that evolution equation describing the amplitude of the odderon
exchange at high energies.
| [
{
"created": "Fri, 2 May 2014 16:11:37 GMT",
"version": "v1"
},
{
"created": "Mon, 5 May 2014 18:26:16 GMT",
"version": "v2"
},
{
"created": "Fri, 15 Aug 2014 14:41:37 GMT",
"version": "v3"
}
] | 2015-06-19 | [
[
"Balitsky",
"I.",
""
],
[
"Grabovsky",
"A. V.",
""
]
] | It is well known that high-energy scattering of a meson from some hadronic target can be described by the interaction of that target with a color dipole formed by two Wilson lines corresponding to fast quark-antiquark pair. Moreover, the energy dependence of the scattering amplitude is governed by the evolution equation of this color dipole with respect to rapidity. Similarly, the energy dependence of scattering of a baryon can be described in terms of evolution of a three-Wilson-lines operator with respect to the rapidity of the Wilson lines. We calculate the evolution of the 3-quark Wilson loop operator in the next-to-leading order (NLO) and present a quasi-conformal evolution equation for a composite 3-Wilson-lines operator. We also obtain the linearized version of that evolution equation describing the amplitude of the odderon exchange at high energies. |
1408.2165 | Mateusz Iskrzy\'nski | Mateusz Iskrzynski | Effects of supersymmetric threshold corrections on the Yukawa matrix
unification | 19 pages, 9 figures, 3 tables; journal version: updated numerical
results after finding a bug in the software, their meaning and reasoning in
the article remain the same; added scatter plots of scanned points; The
European Physical Journal C, Volume 75, Issue 2 (February 2015) | null | 10.1140/epjc/s10052-015-3259-2 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present an updated analysis of the Yukawa matrix unification within the
renormalizable Minimal Supersymmetric Standard Model. It is assumed that the
soft terms are non-universal but flavour-diagonal in the super-CKM basis at the
GUT scale. Trilinear Higgs-squark-squark A-terms can generate large threshold
corrections to the Yukawa matrix $\mathbf{Y}^d$ at the superpartner decoupling
scale. In effect, the SU(5) boundary condition $\mathbf{Y}^d=\mathbf{Y}^{e\,T}$
at the GUT scale can be satisfied. However, such large trilinear terms make the
usual Higgs vacuum metastable (though long-lived). We broaden previous studies
by including results from the first LHC phase, notably the measurement of the
Higgs particle mass, as well as a quantitative investigation of flavour
observables.
| [
{
"created": "Sat, 9 Aug 2014 23:46:04 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Feb 2015 11:00:18 GMT",
"version": "v2"
}
] | 2015-02-12 | [
[
"Iskrzynski",
"Mateusz",
""
]
] | We present an updated analysis of the Yukawa matrix unification within the renormalizable Minimal Supersymmetric Standard Model. It is assumed that the soft terms are non-universal but flavour-diagonal in the super-CKM basis at the GUT scale. Trilinear Higgs-squark-squark A-terms can generate large threshold corrections to the Yukawa matrix $\mathbf{Y}^d$ at the superpartner decoupling scale. In effect, the SU(5) boundary condition $\mathbf{Y}^d=\mathbf{Y}^{e\,T}$ at the GUT scale can be satisfied. However, such large trilinear terms make the usual Higgs vacuum metastable (though long-lived). We broaden previous studies by including results from the first LHC phase, notably the measurement of the Higgs particle mass, as well as a quantitative investigation of flavour observables. |
hep-ph/0409077 | Boris Kopeliovich | C. Ciofi degli Atti and B.Z. Kopeliovich | Time Evolution of Hadronization and Grey Tracks in DIS off Nuclei | 10 pages, 2 figures | Phys.Lett. B606 (2005) 281-287 | 10.1016/j.physletb.2004.12.021 | null | hep-ph nucl-th | null | The analysis of the grey tracks produced in Deep Inelastic Scattering (DIS)
off nuclei provides important information on the space-time development of
hadronization in nuclear medium. This method is complementary to the
measurement of nuclear attenuation of leading inclusive hadrons. While the
latter is focused on the hadronization dynamics for the quite rare process of
leading hadrons production, the former covers the main bulk of inelastic
events, and its Q^2 dependence is a very sensitive tool to discriminate between
different models of hadronization. Employing the model of perturbative
hadronization developed earlier, we calculate the Q^2 and x_{Bj} dependences of
the number of collisions and relate it to the mean number of grey tracks, using
an empirical relation obtained from the analysis of data from the Fermilab E665
experiment on DIS of muons off the Xe nucleus. We found the number of grey
tracks to rise steeply with Q^2 in good agreement with the experimental data.
| [
{
"created": "Tue, 7 Sep 2004 17:45:38 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Atti",
"C. Ciofi degli",
""
],
[
"Kopeliovich",
"B. Z.",
""
]
] | The analysis of the grey tracks produced in Deep Inelastic Scattering (DIS) off nuclei provides important information on the space-time development of hadronization in nuclear medium. This method is complementary to the measurement of nuclear attenuation of leading inclusive hadrons. While the latter is focused on the hadronization dynamics for the quite rare process of leading hadrons production, the former covers the main bulk of inelastic events, and its Q^2 dependence is a very sensitive tool to discriminate between different models of hadronization. Employing the model of perturbative hadronization developed earlier, we calculate the Q^2 and x_{Bj} dependences of the number of collisions and relate it to the mean number of grey tracks, using an empirical relation obtained from the analysis of data from the Fermilab E665 experiment on DIS of muons off the Xe nucleus. We found the number of grey tracks to rise steeply with Q^2 in good agreement with the experimental data. |
hep-ph/0306123 | Andriy Kostyuk | A.P. Kostyuk | Statistical hadronization of charm in heavy ion collisions | A talk given to the Seventh Workshop on Quantum Chromodynamics, 6 -
10 January 2003, Villefranche-sur-Mer, France. 9 pages, LaTeX, 2 PS-figures.
(This contribution was sent to print before the new PHENIX data
(nucl-ex/0305030) appeared.) | null | null | null | hep-ph | null | Production of open and hidden charm hadrons in heavy ion collisions is
considered within the statistical coalescence model (SCM). Charmed
quark-antiquark pairs are assumed to be created at the initial stage of the
reaction in hard parton collisions. The number of these pairs is conserved
during the evolution of the system. At hadronization, the charmed (anti)quarks
are distributed among open and hidden charm hadrons in accordance with laws of
statistical mechanics. Important special cases: a system with a small number of
charmed quark-antiquark pairs and charm hadronization in a subsystem of the
whole system are considered.
The model calculations are compared with the preliminary PHENIX data for
J/psi production at RHIC. Possible influence of the in-nuclear modification of
the parton distribution functions (shadowing) on the SCM results is studied.
| [
{
"created": "Fri, 13 Jun 2003 16:16:52 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kostyuk",
"A. P.",
""
]
] | Production of open and hidden charm hadrons in heavy ion collisions is considered within the statistical coalescence model (SCM). Charmed quark-antiquark pairs are assumed to be created at the initial stage of the reaction in hard parton collisions. The number of these pairs is conserved during the evolution of the system. At hadronization, the charmed (anti)quarks are distributed among open and hidden charm hadrons in accordance with laws of statistical mechanics. Important special cases: a system with a small number of charmed quark-antiquark pairs and charm hadronization in a subsystem of the whole system are considered. The model calculations are compared with the preliminary PHENIX data for J/psi production at RHIC. Possible influence of the in-nuclear modification of the parton distribution functions (shadowing) on the SCM results is studied. |
2404.16673 | Yifan Chen | Yifan Chen, Ran Ding, Yuxin Liu, Yosuke Mizuno, Jing Shu, Haiyue Yu,
Yanjie Zeng | Illuminating Black Hole Shadow with Dark Matter Annihilation | 19 pages, 6 figures, references updated | null | null | null | hep-ph astro-ph.CO astro-ph.HE gr-qc | http://creativecommons.org/licenses/by/4.0/ | The Event Horizon Telescope (EHT) has revolutionized our ability to study
black holes by providing unprecedented spatial resolution and unveiling
horizon-scale details. With advancements leading to the next-generation EHT,
there is potential to probe even deeper into the black hole's dark region,
especially the inner shadow characterized by low-intensity foreground emissions
from the jet, thanks to a significant enhancement in dynamic range by two
orders of magnitude. We demonstrate how such enhanced observations could
transform supermassive black holes into powerful probes for detecting
annihilating dark matter, which can form a dense profile in the vicinity of
supermassive black holes, by examining the morphology of the black hole image.
| [
{
"created": "Thu, 25 Apr 2024 15:20:57 GMT",
"version": "v1"
},
{
"created": "Thu, 2 May 2024 11:39:38 GMT",
"version": "v2"
}
] | 2024-05-03 | [
[
"Chen",
"Yifan",
""
],
[
"Ding",
"Ran",
""
],
[
"Liu",
"Yuxin",
""
],
[
"Mizuno",
"Yosuke",
""
],
[
"Shu",
"Jing",
""
],
[
"Yu",
"Haiyue",
""
],
[
"Zeng",
"Yanjie",
""
]
] | The Event Horizon Telescope (EHT) has revolutionized our ability to study black holes by providing unprecedented spatial resolution and unveiling horizon-scale details. With advancements leading to the next-generation EHT, there is potential to probe even deeper into the black hole's dark region, especially the inner shadow characterized by low-intensity foreground emissions from the jet, thanks to a significant enhancement in dynamic range by two orders of magnitude. We demonstrate how such enhanced observations could transform supermassive black holes into powerful probes for detecting annihilating dark matter, which can form a dense profile in the vicinity of supermassive black holes, by examining the morphology of the black hole image. |
0907.5392 | Pran Nath | Daniel Feldman, Zuowei Liu, Pran Nath, and Brent D. Nelson | Explaining PAMELA and WMAP data through Coannihilations in Extended
SUGRA with Collider Implications | 13 pages, 7 figures; additional refs. in v2; published in PRD | Phys.Rev.D80:075001,2009 | 10.1103/PhysRevD.80.075001 | MCTP-09-48, NUB-3264, YITP -SB-09-23 | hep-ph astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The PAMELA positron excess is analyzed within the framework of nonuniversal
SUGRA models with an extended $U(1)^n$ gauge symmetry in the hidden sector
leading to neutralino dark matter with either a mixed Higgsino-wino LSP or an
essentially pure wino dominated LSP. The Higgsino-wino LSP can produce the
observed PAMELA positron excess and satisfy relic density constraints in the
extended class of models due to a near degeneracy of the mass spectrum of the
extended neutralino sector with the LSP mass. The simultaneous satisfaction of
the WMAP relic density data and the PAMELA data is accomplished through a
co-annihilation mechanism ($B_{\rm Co}-mechanism$), and leads to predictions of
a neutralino and a chargino in the mass range (180-200) GeV as well as low
lying sparticles accessible at colliders. We show that the models are
consistent with the antiproton constraints from PAMELA as well as photon flux
data from EGRET and FERMI-LAT. Predictions for the scalar neutralino proton
cross section relevant for the direct detection of dark matter are also
discussed and signatures at the LHC for these PAMELA inspired models are
analyzed. It is shown that the mixed Higgsino-wino LSP model will be
discoverable with as little as 1 fb$^{-1}$ of data and is thus a prime
candidate for discovery in the low luminosity runs at the LHC.
| [
{
"created": "Thu, 30 Jul 2009 18:32:51 GMT",
"version": "v1"
},
{
"created": "Sat, 17 Oct 2009 17:09:23 GMT",
"version": "v2"
}
] | 2009-11-06 | [
[
"Feldman",
"Daniel",
""
],
[
"Liu",
"Zuowei",
""
],
[
"Nath",
"Pran",
""
],
[
"Nelson",
"Brent D.",
""
]
] | The PAMELA positron excess is analyzed within the framework of nonuniversal SUGRA models with an extended $U(1)^n$ gauge symmetry in the hidden sector leading to neutralino dark matter with either a mixed Higgsino-wino LSP or an essentially pure wino dominated LSP. The Higgsino-wino LSP can produce the observed PAMELA positron excess and satisfy relic density constraints in the extended class of models due to a near degeneracy of the mass spectrum of the extended neutralino sector with the LSP mass. The simultaneous satisfaction of the WMAP relic density data and the PAMELA data is accomplished through a co-annihilation mechanism ($B_{\rm Co}-mechanism$), and leads to predictions of a neutralino and a chargino in the mass range (180-200) GeV as well as low lying sparticles accessible at colliders. We show that the models are consistent with the antiproton constraints from PAMELA as well as photon flux data from EGRET and FERMI-LAT. Predictions for the scalar neutralino proton cross section relevant for the direct detection of dark matter are also discussed and signatures at the LHC for these PAMELA inspired models are analyzed. It is shown that the mixed Higgsino-wino LSP model will be discoverable with as little as 1 fb$^{-1}$ of data and is thus a prime candidate for discovery in the low luminosity runs at the LHC. |
hep-ph/0006006 | Uma Mahanta | Uma Mahanta and Subhendra Mohanty | Effects of non-factorizable metric on neutrino oscillation inside
supernova | Latex file, 8 pages, final version to be published in Physical Review
D | Phys.Rev. D62 (2000) 083003 | 10.1103/PhysRevD.62.083003 | null | hep-ph | null | In this paper we construct the interaction potential between the dense
supernova core and neutrinos due to the exchange of light radions in the
Randall-Sundrum scenario. We then show that the radion exchange potential
affects the neutrino oscillation phenomenology inside the supernova
significantly if the radion mass is less than around 1 GeV. In order that the
Bethe-Wilson mechanism for heating the envelope and r-process neucleosynthesis
be operative, the radion mass must be greater than 1 GeV. Bounds on the radion
mass of the same order of magnitude can also be derived from TASSO and CLEO
data on B decays.
| [
{
"created": "Thu, 1 Jun 2000 10:55:23 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Sep 2000 18:23:27 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Mahanta",
"Uma",
""
],
[
"Mohanty",
"Subhendra",
""
]
] | In this paper we construct the interaction potential between the dense supernova core and neutrinos due to the exchange of light radions in the Randall-Sundrum scenario. We then show that the radion exchange potential affects the neutrino oscillation phenomenology inside the supernova significantly if the radion mass is less than around 1 GeV. In order that the Bethe-Wilson mechanism for heating the envelope and r-process neucleosynthesis be operative, the radion mass must be greater than 1 GeV. Bounds on the radion mass of the same order of magnitude can also be derived from TASSO and CLEO data on B decays. |
1711.00553 | Sarif Khan | Anirban Biswas, Sandhya Choubey, Laura Covi, Sarif Khan | Explaining the 3.5 keV X-ray Line in a ${L_{\mu}-L_{\tau}}$ Extension of
the Inert Doublet Model | 24 pages, 6 figures, Version published in JCAP, Some minor changes in
the text | JCAP02(2018)002 | 10.1088/1475-7516/2018/02/002 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explain the existence of neutrino masses and their flavor structure, dark
matter relic abundance and the observed 3.5 keV X-ray line within the framework
of a gauged $U(1)_{L_{\mu} - L_{\tau}}$ extension of the "scotogenic" model. In
the $U(1)_{L_{\mu} - L_{\tau}}$ symmetric limit, two of the the RH neutrinos
are degenerate in mass, while the third is heavier. The $U(1)_{L_{\mu} -
L_{\tau}}$ symmetry is broken spontaneously. Firstly, this breaks the
$\mu-\tau$ symmetry in the light neutrino sector. Secondly, this results in
mild splitting of the two degenerate RH neutrinos, with their mass difference
given in terms of the $U(1)_{L_{\mu} - L_{\tau}}$ breaking parameter. Finally,
we get a massive $Z_{\mu\tau}$ gauge boson. Due to the added $Z_2$ symmetry
under which the RH neutrinos and the inert doublet are odd, the canonical
Type-I seesaw is forbidden and the tiny neutrino masses are generated
radiatively at one loop. The same $Z_2$ symmetry also ensures that the lightest
RH neutrino is stable and the other two can only decay into the lightest one.
This makes the two nearly-degenerate lighter neutrinos a two-component dark
matter, which in our model are produced by the freeze-in mechanism via the
decay of the $Z_{\mu\tau}$ gauge boson in the early universe. We show that the
next-to-lightest RH neutrino has a very long lifetime and decays into the
lightest one at the present epoch explaining the observed 3.5 keV line.
| [
{
"created": "Wed, 1 Nov 2017 22:27:51 GMT",
"version": "v1"
},
{
"created": "Sat, 3 Feb 2018 18:47:07 GMT",
"version": "v2"
}
] | 2018-02-06 | [
[
"Biswas",
"Anirban",
""
],
[
"Choubey",
"Sandhya",
""
],
[
"Covi",
"Laura",
""
],
[
"Khan",
"Sarif",
""
]
] | We explain the existence of neutrino masses and their flavor structure, dark matter relic abundance and the observed 3.5 keV X-ray line within the framework of a gauged $U(1)_{L_{\mu} - L_{\tau}}$ extension of the "scotogenic" model. In the $U(1)_{L_{\mu} - L_{\tau}}$ symmetric limit, two of the the RH neutrinos are degenerate in mass, while the third is heavier. The $U(1)_{L_{\mu} - L_{\tau}}$ symmetry is broken spontaneously. Firstly, this breaks the $\mu-\tau$ symmetry in the light neutrino sector. Secondly, this results in mild splitting of the two degenerate RH neutrinos, with their mass difference given in terms of the $U(1)_{L_{\mu} - L_{\tau}}$ breaking parameter. Finally, we get a massive $Z_{\mu\tau}$ gauge boson. Due to the added $Z_2$ symmetry under which the RH neutrinos and the inert doublet are odd, the canonical Type-I seesaw is forbidden and the tiny neutrino masses are generated radiatively at one loop. The same $Z_2$ symmetry also ensures that the lightest RH neutrino is stable and the other two can only decay into the lightest one. This makes the two nearly-degenerate lighter neutrinos a two-component dark matter, which in our model are produced by the freeze-in mechanism via the decay of the $Z_{\mu\tau}$ gauge boson in the early universe. We show that the next-to-lightest RH neutrino has a very long lifetime and decays into the lightest one at the present epoch explaining the observed 3.5 keV line. |
hep-ph/9312326 | null | Tadashi Kon and Toshihiko Nonaka | Can Stop be Light Enough for TRISTAN ? | (Talk presented at The 2nd Workshop on TRISTAN Physics at High
Luminosities, KEK, Japan, 24-26, Nov.,1993) ; 14 pages (LaTeX), 8 figures not
included (available on request) ; ITP-SU-93/06, RUP-93-11 | null | null | null | hep-ph | null | \def\nle{{\stackrel{<}{\sim}}} We examine a possibility for existence of a
light supersymmetric partner of the top quark (stop) with mass 15 $\sim$ 16 GeV
in the framework of the minimal supergravity GUT model. Such light stop could
explain the slight excess of the high $p_{T}$ cross section of the
$D^{*\pm}$-meson production in two-photon process at TRISTAN. We point out that
the existence of such stop could change the dominant decay mode of gluino and
could weaken substantially present experimental bounds on the mass of gluino.
It seems that there is a finite parameter region allowing existence of such
light stop even if we consider the present experimental data. Inversely, if
such light stop was discovered at TRISTAN, masses and mixing parameters of the
other SUSY partners as well as masses of the Higgs and the top will be severely
constrained, for example, $m_{\tilde{g}}\simeq$85GeV,
$m_{\tilde{W_{1}}}\nle$50GeV, 110GeV$\nle m_{\tilde{\ell}}\nle$140GeV,
120GeV$\nle m_{\tilde{q}}\nle$160GeV, $\theta_{t}\simeq0.9$, $m_{h}\nle$ 65GeV
and 130GeV$\nle m_{t}\nle$140GeV. We also discuss briefly the proton decay and
the dark matter constraints.
| [
{
"created": "Wed, 22 Dec 1993 18:42:14 GMT",
"version": "v1"
}
] | 2009-09-25 | [
[
"Kon",
"Tadashi",
""
],
[
"Nonaka",
"Toshihiko",
""
]
] | \def\nle{{\stackrel{<}{\sim}}} We examine a possibility for existence of a light supersymmetric partner of the top quark (stop) with mass 15 $\sim$ 16 GeV in the framework of the minimal supergravity GUT model. Such light stop could explain the slight excess of the high $p_{T}$ cross section of the $D^{*\pm}$-meson production in two-photon process at TRISTAN. We point out that the existence of such stop could change the dominant decay mode of gluino and could weaken substantially present experimental bounds on the mass of gluino. It seems that there is a finite parameter region allowing existence of such light stop even if we consider the present experimental data. Inversely, if such light stop was discovered at TRISTAN, masses and mixing parameters of the other SUSY partners as well as masses of the Higgs and the top will be severely constrained, for example, $m_{\tilde{g}}\simeq$85GeV, $m_{\tilde{W_{1}}}\nle$50GeV, 110GeV$\nle m_{\tilde{\ell}}\nle$140GeV, 120GeV$\nle m_{\tilde{q}}\nle$160GeV, $\theta_{t}\simeq0.9$, $m_{h}\nle$ 65GeV and 130GeV$\nle m_{t}\nle$140GeV. We also discuss briefly the proton decay and the dark matter constraints. |
1301.3062 | Chee Sheng Fong | Chee Sheng Fong, Enrico Nardi, Antonio Riotto | Leptogenesis in the Universe | 60 pages, 4 figures. Published in Special Issue on Neutrino Physics,
Advances in High Energy Physics Hindawi Publishing Corporation 2012 | Advances in High Energy Physics, vol. 2012, Article ID 158303, 59
pages, 2012 | 10.1155/2012/158303 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Leptogenesis is a class of scenarios in which the cosmic baryon asymmetry
originates from an initial lepton asymmetry generated in the decays of heavy
sterile neutrinos in the early Universe. We explain why leptogenesis is an
appealing mechanism for baryogenesis. We review its motivations, the basic
ingredients, and describe subclasses of effects, like those of lepton flavours,
spectator processes, scatterings, finite temperature corrections, the role of
the heavier sterile neutrinos and quantum corrections. We then address
leptogenesis in supersymmetric scenarios, as well as some other popular
variations of the basic leptogenesis framework.
| [
{
"created": "Mon, 14 Jan 2013 17:12:06 GMT",
"version": "v1"
}
] | 2013-01-16 | [
[
"Fong",
"Chee Sheng",
""
],
[
"Nardi",
"Enrico",
""
],
[
"Riotto",
"Antonio",
""
]
] | Leptogenesis is a class of scenarios in which the cosmic baryon asymmetry originates from an initial lepton asymmetry generated in the decays of heavy sterile neutrinos in the early Universe. We explain why leptogenesis is an appealing mechanism for baryogenesis. We review its motivations, the basic ingredients, and describe subclasses of effects, like those of lepton flavours, spectator processes, scatterings, finite temperature corrections, the role of the heavier sterile neutrinos and quantum corrections. We then address leptogenesis in supersymmetric scenarios, as well as some other popular variations of the basic leptogenesis framework. |
0904.3002 | David Seery | Philippe Brax, Clare Burrage, Anne-Christine Davis, David Seery and
Amanda Weltman | Collider constraints on interactions of dark energy with the Standard
Model | 39 pages, 8 figures, uses ioplatex.sty and feynmp. v2: Matches
version accepted by JHEP; extended discussion of straight corrections,
summarized in the text and described in detail in a new Appendix A.
Conclusions unchanged | JHEP 0909:128,2009 | 10.1088/1126-6708/2009/09/128 | DESY 08-207 | hep-ph astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study models in which a light scalar dark energy particle couples to the
gauge fields of the electroweak force, the photon, Z and W bosons. Our analysis
applies to a large class of interacting dark energy models, including those in
which the dark energy mass can be adjusted to evade fifth-force bounds by the
so-called chameleon mechanism. We conclude that--with the usual choice of Higgs
sector--electroweak precision observables are screened from the indirect
effects of dark energy, making such corrections effectively unobservable at
present-day colliders, and limiting the dark energy discovery potential of any
future International Linear Collider. We show that a similar screening effect
applies to processes mediated by flavour-changing neutral currents, which can
be traced to the Glashow-Iliopoulos-Maiani mechanism. However, Higgs boson
production at the Large Hadron Collider via weak boson fusion may receive
observable corrections.
| [
{
"created": "Mon, 20 Apr 2009 19:48:24 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Dec 2009 18:05:21 GMT",
"version": "v2"
}
] | 2009-12-08 | [
[
"Brax",
"Philippe",
""
],
[
"Burrage",
"Clare",
""
],
[
"Davis",
"Anne-Christine",
""
],
[
"Seery",
"David",
""
],
[
"Weltman",
"Amanda",
""
]
] | We study models in which a light scalar dark energy particle couples to the gauge fields of the electroweak force, the photon, Z and W bosons. Our analysis applies to a large class of interacting dark energy models, including those in which the dark energy mass can be adjusted to evade fifth-force bounds by the so-called chameleon mechanism. We conclude that--with the usual choice of Higgs sector--electroweak precision observables are screened from the indirect effects of dark energy, making such corrections effectively unobservable at present-day colliders, and limiting the dark energy discovery potential of any future International Linear Collider. We show that a similar screening effect applies to processes mediated by flavour-changing neutral currents, which can be traced to the Glashow-Iliopoulos-Maiani mechanism. However, Higgs boson production at the Large Hadron Collider via weak boson fusion may receive observable corrections. |
2212.04698 | Shivam Gola | Shivam Gola | Pseudo scalar dark matter in a generic U$(1)_X$ model | 16 pages, 6 figures, Matches with the accepted version of the
publication | null | 10.1016/j.physletb.2023.137982 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We consider a $U(1)_X$ extension of the Standard Model~(SM), where the
spontaneous breaking of $U(1)_X$ gauge group results in a pseudo scalar
particle which is the proposed candidate for dark matter. In the model, we
introduce three right-handed neutrinos~(RHNs) $N_R^i$ and two extra scalars
$\Phi$, $\chi$, which are SM gauge singlets but charged under $U(1)_X$ gauge
group. Right-handed neutrinos are required to have the model anomaly free and
explain the neutrino oscillation data. The heaviest scalar breaks the $U(1)_X$
gauge symmetry and the other extra scalar gives a pseudo scalar DM candidate. A
pseudo scalar dark matter~(DM) is an interesting candidate as it naturally
evades the stringent direct detection bounds due to its coupling structure. We
study the phenomenology of this pseudo-scalar DM while considering several
theoretical and experimental constraints. We find that in our model, there is a
feasible parameter space, which satisfies by the DM lifetime bound, relic and
direct detection constraints while respecting the colliders and other bounds.
| [
{
"created": "Fri, 9 Dec 2022 07:15:25 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Jan 2023 06:57:27 GMT",
"version": "v2"
},
{
"created": "Thu, 25 May 2023 10:36:44 GMT",
"version": "v3"
}
] | 2023-06-28 | [
[
"Gola",
"Shivam",
""
]
] | We consider a $U(1)_X$ extension of the Standard Model~(SM), where the spontaneous breaking of $U(1)_X$ gauge group results in a pseudo scalar particle which is the proposed candidate for dark matter. In the model, we introduce three right-handed neutrinos~(RHNs) $N_R^i$ and two extra scalars $\Phi$, $\chi$, which are SM gauge singlets but charged under $U(1)_X$ gauge group. Right-handed neutrinos are required to have the model anomaly free and explain the neutrino oscillation data. The heaviest scalar breaks the $U(1)_X$ gauge symmetry and the other extra scalar gives a pseudo scalar DM candidate. A pseudo scalar dark matter~(DM) is an interesting candidate as it naturally evades the stringent direct detection bounds due to its coupling structure. We study the phenomenology of this pseudo-scalar DM while considering several theoretical and experimental constraints. We find that in our model, there is a feasible parameter space, which satisfies by the DM lifetime bound, relic and direct detection constraints while respecting the colliders and other bounds. |
hep-ph/9808484 | Martti Raidal | Ernest Ma, Martti Raidal, Utpal Sarkar | Probing the Exotic Particle Content Beyond the Standard Model | Many details and three new figures with cross sections added in
Tevatron and LHC collider phenomenology section | Eur.Phys.J.C8:301-309,1999 | 10.1007/s100529901068 | DESY 98-119 | hep-ph | null | We explore the possible exotic particle content beyond the standard model by
examining all its scalar bilinear combinations. We categorize these exotic
scalar fields and show that without the suppression of (A) their Yukawa
couplings with the known quarks and leptons, and (B) the trilinear couplings
among themselves, most are already constrained to be very heavy from the
nonobservation of proton decay and neutron-antineutron oscillations, the
smallness of $K^0 - \bar {K^0}$, $D^0 - \bar {D^0}$ and $B_d^0 - \bar {B_d^0}$
mixing, as well as the requirement of a nonzero baryon asymmetry of the
universe. On the other hand, assumption (B) may be naturally violated in many
models, especially in supersymmetry, hence certain exotic scalars are allowed
to be below a few TeV in mass and would be easily detectable at planned future
hadron colliders. In particular, large cross sections for the distinctive
processes like $\bar p p \to tt,\bar t c$ and $p p \to t t, b b$ would be
expected at the Fermilab Tevatron and CERN LHC, respectively.
| [
{
"created": "Mon, 31 Aug 1998 10:38:53 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Nov 1998 12:30:52 GMT",
"version": "v2"
}
] | 2011-09-13 | [
[
"Ma",
"Ernest",
""
],
[
"Raidal",
"Martti",
""
],
[
"Sarkar",
"Utpal",
""
]
] | We explore the possible exotic particle content beyond the standard model by examining all its scalar bilinear combinations. We categorize these exotic scalar fields and show that without the suppression of (A) their Yukawa couplings with the known quarks and leptons, and (B) the trilinear couplings among themselves, most are already constrained to be very heavy from the nonobservation of proton decay and neutron-antineutron oscillations, the smallness of $K^0 - \bar {K^0}$, $D^0 - \bar {D^0}$ and $B_d^0 - \bar {B_d^0}$ mixing, as well as the requirement of a nonzero baryon asymmetry of the universe. On the other hand, assumption (B) may be naturally violated in many models, especially in supersymmetry, hence certain exotic scalars are allowed to be below a few TeV in mass and would be easily detectable at planned future hadron colliders. In particular, large cross sections for the distinctive processes like $\bar p p \to tt,\bar t c$ and $p p \to t t, b b$ would be expected at the Fermilab Tevatron and CERN LHC, respectively. |
1409.3532 | Are R. Raklev | Ben Allanach, Anders Kvellestad, Are Raklev | Interpreting a CMS $lljjp_T^{\rm miss}$ Excess With the Golden Cascade
of the MSSM | 7 pages, 11 figures, v2 fixes problem with axis of Fig. 1 and has
some minor changes to text, v3 is a significant revision including new LHC
searches which rules out the golden channel interpretation at 95$\%$
confidence level, v4 corrects a mistake in the axis labels on some figures | Phys. Rev. D 91, 115022 (2015) | 10.1103/PhysRevD.91.115022 | DAMTP-2014-52 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The CMS experiment recently reported an excess consistent with an invariant
mass edge in opposite-sign same flavor (OSSF) leptons, when produced in
conjunction with at least two jets and missing transverse momentum. We provide
an interpretation of the edge in terms of (anti-)squark pair production
followed by the `golden cascade' decay for one of the squarks: $\tilde q
\rightarrow \tilde\chi_2^0 q \to \tilde l l q \to \tilde\chi_1^0 q l l$ in the
minimal supersymmetric standard model (MSSM). A simplified model involving
binos, winos, an on-shell slepton, and the first two generations of squarks
fits the event rate and the invariant mass edge. We check consistency with a
recent ATLAS search in a similar region, finding that much of the good-fit
parameter space is still allowed at the 95% confidence level (CL). However, a
combination of other LHC searches, notably two-lepton stop pair searches and
jets plus $p_T^{\rm miss}$, rule out all of the remaining parameter space at
the 95% CL.
| [
{
"created": "Thu, 11 Sep 2014 18:36:21 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Sep 2014 16:01:31 GMT",
"version": "v2"
},
{
"created": "Wed, 3 Jun 2015 14:49:32 GMT",
"version": "v3"
},
{
"created": "Tue, 1 Dec 2015 17:22:51 GMT",
"version": "v4"
}
] | 2015-12-02 | [
[
"Allanach",
"Ben",
""
],
[
"Kvellestad",
"Anders",
""
],
[
"Raklev",
"Are",
""
]
] | The CMS experiment recently reported an excess consistent with an invariant mass edge in opposite-sign same flavor (OSSF) leptons, when produced in conjunction with at least two jets and missing transverse momentum. We provide an interpretation of the edge in terms of (anti-)squark pair production followed by the `golden cascade' decay for one of the squarks: $\tilde q \rightarrow \tilde\chi_2^0 q \to \tilde l l q \to \tilde\chi_1^0 q l l$ in the minimal supersymmetric standard model (MSSM). A simplified model involving binos, winos, an on-shell slepton, and the first two generations of squarks fits the event rate and the invariant mass edge. We check consistency with a recent ATLAS search in a similar region, finding that much of the good-fit parameter space is still allowed at the 95% confidence level (CL). However, a combination of other LHC searches, notably two-lepton stop pair searches and jets plus $p_T^{\rm miss}$, rule out all of the remaining parameter space at the 95% CL. |
hep-ph/9705247 | Sanghyeon Chang | Sanghyeon Chang, Claudio Coriano, R. D. Field and L. E. Gordon | Spin Dependent Drell Yan and Double Prompt Photon Production to NLO QCD | 6 pages, 6 figures, Presented by C. Coriano at the Fifth
International meeting DIS 97, Chicago 14-18 April 1997 | null | 10.1063/1.53676 | UFIFT--HEP--97--15 | hep-ph | null | We present the complete $O(\alpha_s^2)$ radiative corrections to the (non
singlet) polarized Drell Yan cross section for the production of a lepton pair
with a nonzero $q_T$. The helicity of the incoming states is arbitrary. In the
case of double photon, results for the longitudinal asymmetries and on the
$p_T$ behavior of the cross section are also given (to $O(\alpha_{em}^2\alpha_s
)$) in the central rapidity region of the tagged photon.
| [
{
"created": "Tue, 6 May 1997 21:09:32 GMT",
"version": "v1"
},
{
"created": "Wed, 7 May 1997 22:25:00 GMT",
"version": "v2"
}
] | 2009-10-30 | [
[
"Chang",
"Sanghyeon",
""
],
[
"Coriano",
"Claudio",
""
],
[
"Field",
"R. D.",
""
],
[
"Gordon",
"L. E.",
""
]
] | We present the complete $O(\alpha_s^2)$ radiative corrections to the (non singlet) polarized Drell Yan cross section for the production of a lepton pair with a nonzero $q_T$. The helicity of the incoming states is arbitrary. In the case of double photon, results for the longitudinal asymmetries and on the $p_T$ behavior of the cross section are also given (to $O(\alpha_{em}^2\alpha_s )$) in the central rapidity region of the tagged photon. |
2011.08720 | Ming-Zhu Liu | Ming-Zhu Liu, Jun-Xu Lu, Tian-Wei Wu, Ju-Jun Xie, and Li-Sheng Geng | Can $Z_{cs}(3985)$ be a molecular state of $\bar{D}_s^*D$ and
$\bar{D}_sD^*$ ? | During the numerical calculation, an unfortunate coding error
occurred which mis-identified the exchange of $K$ and $K^*$ mesons, which
could not happen. As a result, the OBE potential could not provide a relevant
binding mechanism for the $\bar{D}_s^{(*)}D^{(*)}$ systems studied in the
present work | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We study the $Z_{cs}(3985)$ state recently observed by the BESIII
Collaboration in the one-boson-exchange model, assuming that it is a
$\bar{D}_s^{(*)}D^{(*)}$ molecule, which has the quark content
$c\bar{c}s\bar{q}$ with $q = u$, $d$. It is shown that the one-boson-exchange
potential is too weak to generate dynamcally $\bar{D}_s D$, $\bar{D}^*_s D$,
and $\bar{D}_sD^*$ states, while for the case of $\bar{D}^*_s D^*$, very
loosely bound states are likely, with binding energies of the order of several
MeV. We conclude that, the observed $Z_{cs}(3985)$ state, if confirmed by
further experiments, cannot be a pure hadronic molecular state of $\bar{D}_s
D^*$ and $\bar{D}_s^*D$ and could consist of large components of compact
nature.
| [
{
"created": "Tue, 17 Nov 2020 15:45:57 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Nov 2020 05:38:28 GMT",
"version": "v2"
}
] | 2020-11-19 | [
[
"Liu",
"Ming-Zhu",
""
],
[
"Lu",
"Jun-Xu",
""
],
[
"Wu",
"Tian-Wei",
""
],
[
"Xie",
"Ju-Jun",
""
],
[
"Geng",
"Li-Sheng",
""
]
] | We study the $Z_{cs}(3985)$ state recently observed by the BESIII Collaboration in the one-boson-exchange model, assuming that it is a $\bar{D}_s^{(*)}D^{(*)}$ molecule, which has the quark content $c\bar{c}s\bar{q}$ with $q = u$, $d$. It is shown that the one-boson-exchange potential is too weak to generate dynamcally $\bar{D}_s D$, $\bar{D}^*_s D$, and $\bar{D}_sD^*$ states, while for the case of $\bar{D}^*_s D^*$, very loosely bound states are likely, with binding energies of the order of several MeV. We conclude that, the observed $Z_{cs}(3985)$ state, if confirmed by further experiments, cannot be a pure hadronic molecular state of $\bar{D}_s D^*$ and $\bar{D}_s^*D$ and could consist of large components of compact nature. |
hep-ph/0608285 | Nello Paver | A.A. Pankov, N. Paver and A.V. Tsytrinov | Distinguishing new physics scenarios with polarized electron and
positron beams | LaTex, 6 pages, 2 tables, 2 eps figures, Talk given at the
International Linear Collider Workshop LCWS06, Bangalore, India, 9-13 March,
2006 | Pramana69:877-882,2007 | 10.1007/s12043-007-0198-y | null | hep-ph | null | Contactlike nonstandard interactions can be revealed only through deviations
of observables from the standard model predictions. We consider a number of
such nonstandard scenarios, and discuss their identification as sources of
deviations in fermion-pair production processes at the International Linear
Collider, if they were observed. We emphasize the role of e^- and e^+
polarization in enhancing the identification reaches.
| [
{
"created": "Fri, 25 Aug 2006 16:55:16 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Pankov",
"A. A.",
""
],
[
"Paver",
"N.",
""
],
[
"Tsytrinov",
"A. V.",
""
]
] | Contactlike nonstandard interactions can be revealed only through deviations of observables from the standard model predictions. We consider a number of such nonstandard scenarios, and discuss their identification as sources of deviations in fermion-pair production processes at the International Linear Collider, if they were observed. We emphasize the role of e^- and e^+ polarization in enhancing the identification reaches. |
2201.11519 | Luca Buonocore | Luca Buonocore, Massimiliano Grazzini, J\"urg Haag, Luca Rottoli and
Chiara Savoini | Effective transverse momentum in multiple jet production at hadron
colliders | 9 pages, 3 figures. Added appendix with details on jet and soft
functions at NLO. Version published in Phys.Rev.D | null | 10.1103/PhysRevD.106.014008 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the class of inclusive hadron collider processes in which several
energetic jets are produced, possibly accompanied by colourless particles (such
as Higgs boson(s), vector boson(s) with their leptonic decays, and so forth).
We propose a new variable that smoothly captures the $N+1$ to $N$-jet
transition. This variable, that we dub $k_T^{\rm ness}$, represents an
effective transverse momentum controlling the singularities of the $N+1$-jet
cross section when the additional jet is unresolved. The $k_T^{\rm ness}$
variable offers novel opportunities to perform higher-order calculations in
Quantum Chromodynamics (QCD) by using non-local subtraction schemes. We study
the singular behavior of the $N+1$-jet cross section as $k_T^{\rm ness}\to 0$
and, as a phenomenological application, we use the ensuing results to evaluate
next-to-leading order corrections to $H$+jet and $Z$+2 jet production at the
LHC. We show that $k_T^{\rm ness}$ performs extremely well as a resolution
variable and appears to be very stable with respect to hadronization and
multiple-parton interactions.
| [
{
"created": "Thu, 27 Jan 2022 13:50:35 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Sep 2022 21:15:19 GMT",
"version": "v2"
}
] | 2022-09-22 | [
[
"Buonocore",
"Luca",
""
],
[
"Grazzini",
"Massimiliano",
""
],
[
"Haag",
"Jürg",
""
],
[
"Rottoli",
"Luca",
""
],
[
"Savoini",
"Chiara",
""
]
] | We consider the class of inclusive hadron collider processes in which several energetic jets are produced, possibly accompanied by colourless particles (such as Higgs boson(s), vector boson(s) with their leptonic decays, and so forth). We propose a new variable that smoothly captures the $N+1$ to $N$-jet transition. This variable, that we dub $k_T^{\rm ness}$, represents an effective transverse momentum controlling the singularities of the $N+1$-jet cross section when the additional jet is unresolved. The $k_T^{\rm ness}$ variable offers novel opportunities to perform higher-order calculations in Quantum Chromodynamics (QCD) by using non-local subtraction schemes. We study the singular behavior of the $N+1$-jet cross section as $k_T^{\rm ness}\to 0$ and, as a phenomenological application, we use the ensuing results to evaluate next-to-leading order corrections to $H$+jet and $Z$+2 jet production at the LHC. We show that $k_T^{\rm ness}$ performs extremely well as a resolution variable and appears to be very stable with respect to hadronization and multiple-parton interactions. |
1203.2531 | Matthew Walters | Peter W. Graham, David E. Kaplan, Surjeet Rajendran, Matthew T.
Walters | Semiconductor Probes of Light Dark Matter | 26 pages, 6 figures, references added, error in mass contribution
corrected, discussion of constraints expanded and clarified, plot of mass
range sensitivity expanded | Physics of the Dark Universe 1 (2012) 32-49 | 10.1016/j.dark.2012.09.001 | null | hep-ph astro-ph.CO hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Dark matter with mass below about a GeV is essentially unobservable in
conventional direct detection experiments. However, newly proposed technology
will allow the detection of single electron events in semiconductor materials
with significantly lowered thresholds. This would allow detection of dark
matter as light as an MeV in mass. Compared to other detection technologies,
semiconductors allow enhanced sensitivity because of their low ionization
energy around an eV. Such detectors would be particularly sensitive to dark
matter with electric and magnetic dipole moments, with a reach many orders of
magnitude beyond current bounds. Observable dipole moment interactions can be
generated by new particles with masses as great as 1000 TeV, providing a window
to scales beyond the reach of current colliders.
| [
{
"created": "Mon, 12 Mar 2012 16:03:58 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Nov 2012 16:04:17 GMT",
"version": "v2"
}
] | 2012-11-13 | [
[
"Graham",
"Peter W.",
""
],
[
"Kaplan",
"David E.",
""
],
[
"Rajendran",
"Surjeet",
""
],
[
"Walters",
"Matthew T.",
""
]
] | Dark matter with mass below about a GeV is essentially unobservable in conventional direct detection experiments. However, newly proposed technology will allow the detection of single electron events in semiconductor materials with significantly lowered thresholds. This would allow detection of dark matter as light as an MeV in mass. Compared to other detection technologies, semiconductors allow enhanced sensitivity because of their low ionization energy around an eV. Such detectors would be particularly sensitive to dark matter with electric and magnetic dipole moments, with a reach many orders of magnitude beyond current bounds. Observable dipole moment interactions can be generated by new particles with masses as great as 1000 TeV, providing a window to scales beyond the reach of current colliders. |
hep-ph/9612467 | Mr Nidal Chamoun | N. Chamoun (University of Oxford) | QCD Sum Rules and the Determination of Leading Twist Non-Singlet
Operator Matrix Elements | 9 pages, 5 figures | Phys.Lett. B397 (1997) 287-295 | 10.1016/S0370-2693(97)00168-8 | null | hep-ph | null | We use QCD sum rules to determine directly the leading-twist non-singlet
operator matrix elements based on calculations of three-point correlator
functions in configuration space. We find a different result from that obtained
by integrating the structure functions' expressions obtained by Belyaev and
Ioffe based on calculations of four-point correlators in momentum space. The
origin of this discrepancy remains unclear.
| [
{
"created": "Wed, 25 Dec 1996 20:44:52 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Dec 1996 03:05:27 GMT",
"version": "v2"
}
] | 2009-10-30 | [
[
"Chamoun",
"N.",
"",
"University of Oxford"
]
] | We use QCD sum rules to determine directly the leading-twist non-singlet operator matrix elements based on calculations of three-point correlator functions in configuration space. We find a different result from that obtained by integrating the structure functions' expressions obtained by Belyaev and Ioffe based on calculations of four-point correlators in momentum space. The origin of this discrepancy remains unclear. |
2309.16815 | Alexandra Friesen | A. V. Friesen, Yu. L. Kalinovsky | Diquarks and $\Lambda^0/\pi^+$, $\Xi^-/\pi^+$ ratios in the framework of
the EPNJL model | 9 pages, 7 pictures, 1 table | null | null | null | hep-ph nucl-th | http://creativecommons.org/licenses/by/4.0/ | The applicability of the effective models to the description of baryons and
the behaviour of ratios of strange baryons to pions is discussed. In the
framework of the EPNJL model, the Bethe - Salpeter equation is used to find
masses of baryons, which are considered as diquark-quark state. Baryon melting
is discussed at a finite chemical potential and a flavor dependence of the
hadronic deconfinement temperature is pointed. It is shown that the description
of the diquark-quark state at finite chemical potential is limited due to the
occurrence of the Bose condensate. This effect is strongly manifested in the
description of light diquarks and baryons. Both $\Lambda^0/\pi^+$ and
$\Xi^-/\pi^+$ ratios show a sharp behaviour as functions of $T/\mu_B$ variable,
where T and $\mu_B$ are calculated along the melting lines.
| [
{
"created": "Thu, 28 Sep 2023 19:45:02 GMT",
"version": "v1"
}
] | 2023-10-02 | [
[
"Friesen",
"A. V.",
""
],
[
"Kalinovsky",
"Yu. L.",
""
]
] | The applicability of the effective models to the description of baryons and the behaviour of ratios of strange baryons to pions is discussed. In the framework of the EPNJL model, the Bethe - Salpeter equation is used to find masses of baryons, which are considered as diquark-quark state. Baryon melting is discussed at a finite chemical potential and a flavor dependence of the hadronic deconfinement temperature is pointed. It is shown that the description of the diquark-quark state at finite chemical potential is limited due to the occurrence of the Bose condensate. This effect is strongly manifested in the description of light diquarks and baryons. Both $\Lambda^0/\pi^+$ and $\Xi^-/\pi^+$ ratios show a sharp behaviour as functions of $T/\mu_B$ variable, where T and $\mu_B$ are calculated along the melting lines. |
1810.02064 | Wangmei Zha | Wangmei Zha, Lijuan Ruan, Zebo Tang, Zhangbu Xu, and Shuai Yang | Coherent photo-produced J$/\psi$ and dielectron yields in isobaric
collisions | null | Phys. Lett. B789 238 (2019) | 10.1016/j.physletb.2018.12.041 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Recently, significant enhancements of J/$\psi$ and $e^{+} e^{-}$ pair
production at very low transverse momenta were observed by the STAR and ALICE
collaboration in peripheral hadronic A+A collisions. The anomaly excesses point
to evidence of coherent photon-nucleus and photon-photon interactions in
violent hadronic heavy-ion collisions, which were conventionally studied only
in ultra-peripheral collisions. The isobaric collisions performed at RHIC
provides a unique opportunity to test the existence of coherent photon products
in hadronic heavy-ion collisions. The idea is that the possible production of
coherent photon products is significantly different in different collision
systems due to the variations in their charge and nuclear density
distributions. In this letter, we focus on the peripheral collisions and
provide theoretical predictions for coherent production of J/$\psi$ and
dielectron in isobaric collisions. We show that the expected yields differ
significantly to perform the experimental test.
| [
{
"created": "Thu, 4 Oct 2018 05:46:16 GMT",
"version": "v1"
}
] | 2019-01-07 | [
[
"Zha",
"Wangmei",
""
],
[
"Ruan",
"Lijuan",
""
],
[
"Tang",
"Zebo",
""
],
[
"Xu",
"Zhangbu",
""
],
[
"Yang",
"Shuai",
""
]
] | Recently, significant enhancements of J/$\psi$ and $e^{+} e^{-}$ pair production at very low transverse momenta were observed by the STAR and ALICE collaboration in peripheral hadronic A+A collisions. The anomaly excesses point to evidence of coherent photon-nucleus and photon-photon interactions in violent hadronic heavy-ion collisions, which were conventionally studied only in ultra-peripheral collisions. The isobaric collisions performed at RHIC provides a unique opportunity to test the existence of coherent photon products in hadronic heavy-ion collisions. The idea is that the possible production of coherent photon products is significantly different in different collision systems due to the variations in their charge and nuclear density distributions. In this letter, we focus on the peripheral collisions and provide theoretical predictions for coherent production of J/$\psi$ and dielectron in isobaric collisions. We show that the expected yields differ significantly to perform the experimental test. |
1709.05813 | Francesco Vissani | Francesco Vissani | Joint analysis of Borexino and SNO solar neutrino data and
reconstruction of the survival probability | LaTeX, 12 pages, 4 figures, 1 table. Minor improvements. Version
accepted in "Nuclear Physics and Atomic Energy" | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Solar neutrino oscillations are supported by KamLAND's antineutrino
measurements, but certain solar neutrino data - the observed shape of the
${}^8$B flux and the difference between day and night counting rates measured
in Super-Kamiokande - do not fit well with the ensuing oscillation pattern.
Interestingly, other solar neutrino data allow independent tests of the
survival probability. Thanks to the new measurements of Borexino at
low-energies along with the standard solar model and to the results of SNO at
high-energies, four values of the neutrino survival probability are known. We
build and study a likelihood based only on these solar neutrino data. The
results agree well with the standard oscillation pattern and in particular with
KamLAND findings. A related and straightforward procedure permits to
reconstruct the survival probability of solar neutrinos and to assess its
uncertainties, for all solar neutrino energies.
| [
{
"created": "Mon, 18 Sep 2017 08:29:18 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Oct 2017 15:13:27 GMT",
"version": "v2"
},
{
"created": "Fri, 29 Dec 2017 18:09:15 GMT",
"version": "v3"
}
] | 2018-01-01 | [
[
"Vissani",
"Francesco",
""
]
] | Solar neutrino oscillations are supported by KamLAND's antineutrino measurements, but certain solar neutrino data - the observed shape of the ${}^8$B flux and the difference between day and night counting rates measured in Super-Kamiokande - do not fit well with the ensuing oscillation pattern. Interestingly, other solar neutrino data allow independent tests of the survival probability. Thanks to the new measurements of Borexino at low-energies along with the standard solar model and to the results of SNO at high-energies, four values of the neutrino survival probability are known. We build and study a likelihood based only on these solar neutrino data. The results agree well with the standard oscillation pattern and in particular with KamLAND findings. A related and straightforward procedure permits to reconstruct the survival probability of solar neutrinos and to assess its uncertainties, for all solar neutrino energies. |
hep-ph/0701173 | Berin Belma Sirvanli | Berin Belma Sirvanli | Semileptonic Lambda(b)-->Lambda neutrino antineutrino decay in the
Leptophobic Z-prime model | 12 pages, 5 figures | Mod.Phys.Lett.A23:347-358,2008 | 10.1142/S0217732308023736 | null | hep-ph | null | We study the exclusive flavor chancing neutral current process
Lambda(b)-->Lambda neutrino antineutrino in the leptophobic Z-prime model,
where charged leptons do not couple to the extra Z-prime boson. The branching
ratio, as well as, the longitudinal,transversal and normal polarizations are
calculated. It has been shown that all these physical observables are very
sensitive to the existence of new physics beyond the standard model and their
experimental measurements can give valuable information about it.
| [
{
"created": "Sun, 21 Jan 2007 08:09:41 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Sirvanli",
"Berin Belma",
""
]
] | We study the exclusive flavor chancing neutral current process Lambda(b)-->Lambda neutrino antineutrino in the leptophobic Z-prime model, where charged leptons do not couple to the extra Z-prime boson. The branching ratio, as well as, the longitudinal,transversal and normal polarizations are calculated. It has been shown that all these physical observables are very sensitive to the existence of new physics beyond the standard model and their experimental measurements can give valuable information about it. |
hep-ph/9506361 | Philippe Jetzer | F.De Paolis, G.Ingrosso, Ph.Jetzer and M.Roncadelli | MACHOs and molecular clouds in galactic halos | Latex file, 5 pages | null | null | ZU-TH 11/95, FNT/T-95/20 | hep-ph | null | Recent observations of microlensing events in the Large Magellanic Cloud by
the MACHO and EROS collaborations suggest that an important fraction of the
galactic halo is in form of Massive Astrophysical Compact Halo Objects (MACHOs)
with mass ~ 0.1 M_{\odot}. We outline a scenario in which dark clusters of
MACHOs and molecular clouds form in the halo at galactocentric distances larger
than ~ 10-20 kpc, provide baryons are a major constituent of the halo. Possible
signatures of the presence of molecular clouds in our galaxy are discussed. We
also discuss how molecular clouds as well as MACHOs can be observed directly in
the nearby M31 galaxy.
| [
{
"created": "Mon, 19 Jun 1995 16:10:27 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"De Paolis",
"F.",
""
],
[
"Ingrosso",
"G.",
""
],
[
"Jetzer",
"Ph.",
""
],
[
"Roncadelli",
"M.",
""
]
] | Recent observations of microlensing events in the Large Magellanic Cloud by the MACHO and EROS collaborations suggest that an important fraction of the galactic halo is in form of Massive Astrophysical Compact Halo Objects (MACHOs) with mass ~ 0.1 M_{\odot}. We outline a scenario in which dark clusters of MACHOs and molecular clouds form in the halo at galactocentric distances larger than ~ 10-20 kpc, provide baryons are a major constituent of the halo. Possible signatures of the presence of molecular clouds in our galaxy are discussed. We also discuss how molecular clouds as well as MACHOs can be observed directly in the nearby M31 galaxy. |
hep-ph/0112080 | Sannino Francesco | Stephane Peigne and Francesco Sannino | Structure Functions are not Parton Probabilities | 4 pages. Invited talk presented during the `International Light-Cone
Workshop', Trento, ECT, September 3-11, 2001. Updated Report-Numbers | Nucl.Phys.Proc.Suppl. 108 (2002) 303-306 | 10.1016/S0920-5632(02)01349-X | LAPTH-conf-883/01, NORDITA-2001-90 HE | hep-ph | null | We explain why contrary to common belief, the deep inelastic scattering
structure functions are not related to parton probabilities in the target.
| [
{
"created": "Wed, 5 Dec 2001 15:39:06 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Dec 2001 14:24:07 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Peigne",
"Stephane",
""
],
[
"Sannino",
"Francesco",
""
]
] | We explain why contrary to common belief, the deep inelastic scattering structure functions are not related to parton probabilities in the target. |
1311.2473 | Erike Cazaroto Ph.D. | E.R. Cazaroto, V.P. Gon\c{c}alves and F.S. Navarra | Charm production in double parton scattering at the LHC | to appear in the proceedings of The 6th International Workshop on
Charm Physics (CHARM 2013) | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate $c\bar{c}c\bar{c}$ and $b\bar{b}b\bar{b}$ production cross
section in Double Parton Scattering (DPS) processes at the energies of LHC. In
our calculation we include saturation effects in the gluon distribution. For
charm production, our results confirm the prediction of a previous work in
which saturation effects were neglected, namely that at the energies of LHC
charm production in DPS processes becomes comparable with charm production in
SPS. We also estimate the production of $c\bar{c}b\bar{b}$ in DPS. Our results
indicate that at $\sqrt{s}=14$ TeV half of the total amount of bottom produced
in proton-proton collisions comes from this process.
| [
{
"created": "Wed, 6 Nov 2013 16:29:59 GMT",
"version": "v1"
}
] | 2013-11-12 | [
[
"Cazaroto",
"E. R.",
""
],
[
"Gonçalves",
"V. P.",
""
],
[
"Navarra",
"F. S.",
""
]
] | We calculate $c\bar{c}c\bar{c}$ and $b\bar{b}b\bar{b}$ production cross section in Double Parton Scattering (DPS) processes at the energies of LHC. In our calculation we include saturation effects in the gluon distribution. For charm production, our results confirm the prediction of a previous work in which saturation effects were neglected, namely that at the energies of LHC charm production in DPS processes becomes comparable with charm production in SPS. We also estimate the production of $c\bar{c}b\bar{b}$ in DPS. Our results indicate that at $\sqrt{s}=14$ TeV half of the total amount of bottom produced in proton-proton collisions comes from this process. |
hep-ph/0006307 | Stefan Dittmaier | A.Denner, S.Dittmaier, M.Roth and D.Wackeroth | Electroweak radiative corrections to e+e- --> WW --> 4fermions in
double-pole approximation -- the RACOONWW approach | 51 pages, latex, 28 postscript files | Nucl.Phys.B587:67-117,2000 | 10.1016/S0550-3213(00)00511-3 | BI-TP 2000/06, LU-ITP 2000/003, PSI-PR-00-11, UR-1604 | hep-ph | null | We calculate the complete O(alpha) electroweak radiative corrections to e+e-
--> WW --> 4f in the electroweak Standard Model in the double-pole
approximation. We give analytical results for the non-factorizable virtual
corrections and express the factorizable virtual corrections in terms of the
known corrections to on-shell W-pair production and W decay. The calculation of
the bremsstrahlung corrections, i.e. the processes e+e- --> 4f+gamma in lowest
order, is based on the full matrix elements. The matching of soft and collinear
singularities between virtual and real corrections is done alternatively in two
different ways, namely by using a subtraction method and by applying
phase-space slicing. The O(alpha) corrections as well as higher-order
initial-state photon radiation are implemented in the Monte Carlo generator
RACOONWW. Numerical results of this program are presented for the
W-pair-production cross section, angular and W-invariant-mass distributions at
LEP2. We also discuss the intrinsic theoretical uncertainty of our approach.
| [
{
"created": "Tue, 27 Jun 2000 15:57:07 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Denner",
"A.",
""
],
[
"Dittmaier",
"S.",
""
],
[
"Roth",
"M.",
""
],
[
"Wackeroth",
"D.",
""
]
] | We calculate the complete O(alpha) electroweak radiative corrections to e+e- --> WW --> 4f in the electroweak Standard Model in the double-pole approximation. We give analytical results for the non-factorizable virtual corrections and express the factorizable virtual corrections in terms of the known corrections to on-shell W-pair production and W decay. The calculation of the bremsstrahlung corrections, i.e. the processes e+e- --> 4f+gamma in lowest order, is based on the full matrix elements. The matching of soft and collinear singularities between virtual and real corrections is done alternatively in two different ways, namely by using a subtraction method and by applying phase-space slicing. The O(alpha) corrections as well as higher-order initial-state photon radiation are implemented in the Monte Carlo generator RACOONWW. Numerical results of this program are presented for the W-pair-production cross section, angular and W-invariant-mass distributions at LEP2. We also discuss the intrinsic theoretical uncertainty of our approach. |
1401.2964 | Diego Maz\'on | Diego Maz\'on | On the use of energy loss mechanisms to constrain Lorentz invariance
violations | 10 pages, 7 figures. v2: A few lines added in Sec. IV. Published in
Physical Review D | Phys. Rev. D 89, 056012 (2014) | 10.1103/PhysRevD.89.056012 | null | hep-ph astro-ph.HE gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In light of recent and probably upcoming observations of very high energy
astroparticles, such as those reported by the IceCube collaboration, we
readdress the energy loss mechanism by Lorentz violating particles. We
analytically show that Cohen-Glashow's formula for energy loss is connected
with a Poisson distribution for the number of decays, whose large fluctuations
prevent placing bounds on Lorentz invariance violations. However, this model
ignores the sharp change in the decay width after each process. We propose
replacing Poisson statistics with a new distribution that takes this into
account. We study the average final energy and its fluctuations according to
the new statistics, contrasting it with Cohen-Glashow's result, and discussing
the reliability of energy loss mechanisms to constrain violations of Lorentz
invariance.
| [
{
"created": "Mon, 13 Jan 2014 19:50:42 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Mar 2014 22:23:37 GMT",
"version": "v2"
}
] | 2014-03-24 | [
[
"Mazón",
"Diego",
""
]
] | In light of recent and probably upcoming observations of very high energy astroparticles, such as those reported by the IceCube collaboration, we readdress the energy loss mechanism by Lorentz violating particles. We analytically show that Cohen-Glashow's formula for energy loss is connected with a Poisson distribution for the number of decays, whose large fluctuations prevent placing bounds on Lorentz invariance violations. However, this model ignores the sharp change in the decay width after each process. We propose replacing Poisson statistics with a new distribution that takes this into account. We study the average final energy and its fluctuations according to the new statistics, contrasting it with Cohen-Glashow's result, and discussing the reliability of energy loss mechanisms to constrain violations of Lorentz invariance. |
1811.09179 | Xing-Gang Wu | Qing Yu, Xing-Gang Wu, Sheng-Quan Wang, Xu-Dong Huang, Jian-Ming Shen,
Jun Zeng | Properties of the decay $H\to\gamma\gamma$ using the approximate
$\alpha_s^4$-corrections and the principle of maximum conformality | 6 pages, 6 figures | Chin. Phys. C 43, 093102 (2019) | 10.1088/1674-1137/43/9/093102 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Higgs boson decay channel, $H\to\gamma\gamma$, is one of the most
important channels for probing the properties of the Higgs boson. In the paper,
we reanalyze its decay width by using the QCD corrections up to
$\alpha_s^4$-order level. The principle of maximum conformality has been
adopted to achieve a precise pQCD prediction without conventional
renormalization scheme-and-scale ambiguities. By taking the Higgs mass as the
one given by the ATLAS and CMS collaborations, i.e.
$M_{H}=125.09\pm0.21\pm0.11$ GeV, we obtain $\Gamma(H\to \gamma\gamma)|_{\rm
LHC}=9.364^{+0.076}_{-0.075}$ KeV.
| [
{
"created": "Thu, 22 Nov 2018 14:07:35 GMT",
"version": "v1"
}
] | 2019-07-25 | [
[
"Yu",
"Qing",
""
],
[
"Wu",
"Xing-Gang",
""
],
[
"Wang",
"Sheng-Quan",
""
],
[
"Huang",
"Xu-Dong",
""
],
[
"Shen",
"Jian-Ming",
""
],
[
"Zeng",
"Jun",
""
]
] | The Higgs boson decay channel, $H\to\gamma\gamma$, is one of the most important channels for probing the properties of the Higgs boson. In the paper, we reanalyze its decay width by using the QCD corrections up to $\alpha_s^4$-order level. The principle of maximum conformality has been adopted to achieve a precise pQCD prediction without conventional renormalization scheme-and-scale ambiguities. By taking the Higgs mass as the one given by the ATLAS and CMS collaborations, i.e. $M_{H}=125.09\pm0.21\pm0.11$ GeV, we obtain $\Gamma(H\to \gamma\gamma)|_{\rm LHC}=9.364^{+0.076}_{-0.075}$ KeV. |
hep-ph/9312205 | James M. Johnson | Suraj N. Gupta, James M. Johnson, Wayne W. Repko and Casimir J.
Suchyta III | Heavy Quarkonium Potential Model and the ${}^1P_1$ State of Charmonium | 15 page REVTEX document | Phys.Rev. D49 (1994) 1551-1555 | 10.1103/PhysRevD.49.1551 | null | hep-ph | null | A theoretical explanation of the observed splittings among the P~states of
charmonium is given with the use of a nonsingular potential model for heavy
quarkonia. We also show that the recently observed mass difference between the
center of gravity of the ${}^3P_J$ states and the ${}^1P_1$ state of $c\bar{c}$
does not provide a direct test of the color hyperfine interaction in heavy
quarkonia. Our theoretical value for the mass of the ${}^1P_1$ state is in
agreement with the experimental result, and its E1 transition width is
341.8~keV. The mass of the $\eta_c'$ state is predicted to be 3622.3~MeV.
| [
{
"created": "Wed, 1 Dec 1993 15:42:07 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Gupta",
"Suraj N.",
""
],
[
"Johnson",
"James M.",
""
],
[
"Repko",
"Wayne W.",
""
],
[
"Suchyta",
"Casimir J.",
"III"
]
] | A theoretical explanation of the observed splittings among the P~states of charmonium is given with the use of a nonsingular potential model for heavy quarkonia. We also show that the recently observed mass difference between the center of gravity of the ${}^3P_J$ states and the ${}^1P_1$ state of $c\bar{c}$ does not provide a direct test of the color hyperfine interaction in heavy quarkonia. Our theoretical value for the mass of the ${}^1P_1$ state is in agreement with the experimental result, and its E1 transition width is 341.8~keV. The mass of the $\eta_c'$ state is predicted to be 3622.3~MeV. |
hep-ph/0510131 | Andre Rubbia | A. Ereditato, A. Rubbia | Conceptual design of a scalable multi-kton superconducting magnetized
liquid Argon TPC | 4 pages, 1 figure, invited talk at 7th International Workshop on
Neutrino Factories and Superbeams (NUFACT05), LNF, Frascati (Rome) | null | 10.1016/j.nuclphysbps.2006.02.059 | null | hep-ph | null | We discuss the possibility of new generation neutrino and astroparticle
physics experiments exploiting a superconducting magnetized liquid Argon Time
Projection Chamber (LAr TPC). The possibility to complement the features of the
LAr TPC with those provided by a magnetic field has been considered in the past
and has been shown to open new physics opportunities, in particular in the
context of a neutrino factory. The experimental operation of a magnetized 10 lt
LAr TPC prototype has been recently demonstrated. From basic proof of
principle, the main challenge to be addressed is the possibility to magnetize a
very large volume of Argon, corresponding to 10 kton or more, for future
neutrino physics applications. In this paper we present one such conceptual
design.
| [
{
"created": "Tue, 11 Oct 2005 08:29:07 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Ereditato",
"A.",
""
],
[
"Rubbia",
"A.",
""
]
] | We discuss the possibility of new generation neutrino and astroparticle physics experiments exploiting a superconducting magnetized liquid Argon Time Projection Chamber (LAr TPC). The possibility to complement the features of the LAr TPC with those provided by a magnetic field has been considered in the past and has been shown to open new physics opportunities, in particular in the context of a neutrino factory. The experimental operation of a magnetized 10 lt LAr TPC prototype has been recently demonstrated. From basic proof of principle, the main challenge to be addressed is the possibility to magnetize a very large volume of Argon, corresponding to 10 kton or more, for future neutrino physics applications. In this paper we present one such conceptual design. |
2105.04299 | Mohamed Jakha | S. El Asri, S. Mouslih, M. Jakha, B. Manaut, Y. Attaourti, S. Taj and
R. Benbrik | Elastic scattering of a muon neutrino by an electron in the presence of
a circularly polarized laser field | 14 pages, 3 figures, 3 tables, 65 references, 1 appendix | null | 10.1103/PhysRevD.104.113001 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | In view of the great contribution of neutrino-electron scattering to the deep
understanding of electroweak interactions, we focus in this paper on the study
of elastic scattering of a muon neutrino by an electron
$(e^{-}\nu_{\mu}\rightarrow e^{-}\nu_{\mu})$ in the presence of a circularly
polarized electromagnetic field. We perform our theoretical calculation within
the framework of Fermi theory using the exact wave functions of charged
particles in an electromagnetic field. The expression of the differential cross
section (DCS) for this process is obtained analytically in the absence and
presence of the laser field. The effect of the field strength and frequency on
the exchange of photons as well as on the DCS is presented and analyzed.
Massive neutrino effects are also included and discussed. This study, added to
the previous ones, will significantly enrich our knowledge in fundamental
physics.
| [
{
"created": "Mon, 10 May 2021 12:21:59 GMT",
"version": "v1"
},
{
"created": "Fri, 3 Dec 2021 17:26:40 GMT",
"version": "v2"
}
] | 2021-12-06 | [
[
"Asri",
"S. El",
""
],
[
"Mouslih",
"S.",
""
],
[
"Jakha",
"M.",
""
],
[
"Manaut",
"B.",
""
],
[
"Attaourti",
"Y.",
""
],
[
"Taj",
"S.",
""
],
[
"Benbrik",
"R.",
""
]
] | In view of the great contribution of neutrino-electron scattering to the deep understanding of electroweak interactions, we focus in this paper on the study of elastic scattering of a muon neutrino by an electron $(e^{-}\nu_{\mu}\rightarrow e^{-}\nu_{\mu})$ in the presence of a circularly polarized electromagnetic field. We perform our theoretical calculation within the framework of Fermi theory using the exact wave functions of charged particles in an electromagnetic field. The expression of the differential cross section (DCS) for this process is obtained analytically in the absence and presence of the laser field. The effect of the field strength and frequency on the exchange of photons as well as on the DCS is presented and analyzed. Massive neutrino effects are also included and discussed. This study, added to the previous ones, will significantly enrich our knowledge in fundamental physics. |
hep-ph/0405043 | Thomas D. Cohen | Thomas D. Cohen | QCD Functional Integrals for Systems with Nonzero Chemical Potential | In memory of I. I. Kogan; to appear in the Iam Kogan Memorial volume | null | 10.1142/9789812775344_0009 | null | hep-ph | null | This paper reviews some recent progress on QCD functional integrals at
nonzero chemical potentials. One issue discussed is the use of QCD inequalities
for this regime. In particular, the positivity of the integrand of particular
Euclidean space functional integrals for two-flavor QCD with degenerate quark
masses is used to demonstrate that the free energy per unit volume for QCD with
a baryon chemical potential $\mu_B$ (and zero isospin chemical potential) is
necessarily greater than the free energy with isospin chemical potential $\mu_I
= \frac{2 \mu_B}{N_c} $ (and zero baryon chemical potential). This result may
be of use in model finite density systems. A corollary to this result is a
rigorous {\it ab initio} bound on the nucleon mass. The second major issue
addressed is the so-called ``Silver Blaze'' problem: the fact that at zero
temperature and chemical potentials less than some critical value the free
energy remains as that of the vacuum. This is puzzling in the context of a
functional integral since a chemical potential affects the functional
determinant of the Dirac operator and any nonzero $\mu$ changes every
eigenvalue of the Dirac operator compared to the $\mu=0$ value. The isospin
Silver Blaze problem is solved through the study of the spectrum of the
operator $\gamma_0 (\dslash + m)$. The status of the baryon Silver Blaze
problem is briefly discussed.
| [
{
"created": "Wed, 5 May 2004 18:49:19 GMT",
"version": "v1"
}
] | 2016-11-23 | [
[
"Cohen",
"Thomas D.",
""
]
] | This paper reviews some recent progress on QCD functional integrals at nonzero chemical potentials. One issue discussed is the use of QCD inequalities for this regime. In particular, the positivity of the integrand of particular Euclidean space functional integrals for two-flavor QCD with degenerate quark masses is used to demonstrate that the free energy per unit volume for QCD with a baryon chemical potential $\mu_B$ (and zero isospin chemical potential) is necessarily greater than the free energy with isospin chemical potential $\mu_I = \frac{2 \mu_B}{N_c} $ (and zero baryon chemical potential). This result may be of use in model finite density systems. A corollary to this result is a rigorous {\it ab initio} bound on the nucleon mass. The second major issue addressed is the so-called ``Silver Blaze'' problem: the fact that at zero temperature and chemical potentials less than some critical value the free energy remains as that of the vacuum. This is puzzling in the context of a functional integral since a chemical potential affects the functional determinant of the Dirac operator and any nonzero $\mu$ changes every eigenvalue of the Dirac operator compared to the $\mu=0$ value. The isospin Silver Blaze problem is solved through the study of the spectrum of the operator $\gamma_0 (\dslash + m)$. The status of the baryon Silver Blaze problem is briefly discussed. |
1612.00831 | Anastasiia Kozachuk | Anastasiia Kozachuk and Nikolai Nikitin | Form factors and differential distributions in rare radiative leptonic
B-decays | 9 pages, 8 figures, Talk given at XII Quark Confinement and the
Hadron Spectrum, August 29 -- September 3, 2016, Thessaloniki, Greece. arXiv
admin note: substantial text overlap with arXiv:1609.06491 | EPJ Web of Conferences 137 (2017) 06011 | 10.1051/epjconf/201713706011 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study rare radiative leptonic decays $B_{(s)}\to e^+e^-\gamma$ and
$B_{(s)}\to \mu^+\mu^-\gamma$ within relativistic quark model. In addition to
previous analysis we give the estimations of the branching ratios for four
values of the minimal photon energy, which correspond to photon selection
criteria of the Belle and LHCb detectors. We find out that the branching ratios
only slightly change. The highest values corresponding to $E^\gamma_{min}=80
\textrm{MeV}$ are ${\cal B}(\bar B^0_s\to e^+e^-\gamma)=18.5\times10^{-9}$ and
${\cal B}(B^0_s\to \mu^+\mu^-\gamma)=11.9\times10^{-9}$. We present the
distribution of the forward-backward asymmetry.
| [
{
"created": "Fri, 2 Dec 2016 20:46:22 GMT",
"version": "v1"
}
] | 2017-04-05 | [
[
"Kozachuk",
"Anastasiia",
""
],
[
"Nikitin",
"Nikolai",
""
]
] | We study rare radiative leptonic decays $B_{(s)}\to e^+e^-\gamma$ and $B_{(s)}\to \mu^+\mu^-\gamma$ within relativistic quark model. In addition to previous analysis we give the estimations of the branching ratios for four values of the minimal photon energy, which correspond to photon selection criteria of the Belle and LHCb detectors. We find out that the branching ratios only slightly change. The highest values corresponding to $E^\gamma_{min}=80 \textrm{MeV}$ are ${\cal B}(\bar B^0_s\to e^+e^-\gamma)=18.5\times10^{-9}$ and ${\cal B}(B^0_s\to \mu^+\mu^-\gamma)=11.9\times10^{-9}$. We present the distribution of the forward-backward asymmetry. |
0903.0451 | Dario Schalla | E. A. Paschos and Dario Schalla | Coherent Pion Production | 16 pages, 10 figures | Phys.Rev.D80:033005,2009 | 10.1103/PhysRevD.80.033005 | DO-TH-09/03 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we present quantitative results for coherent pion production by
neutrinos scattered off nuclei within the framework developed by Gounaris,
Kartavtsev and Paschos. The method is based on PCAC and uses helicity cross
sections for the scattering of weak gauge bosons on nuclei. The process relies
on experimental data for elastic pion-nucleus scattering. A detailed analysis
of the differential and integrated cross sections is presented for neutral and
charged currents, with special emphasis on the regions of integrations. The
results are extended to energies of 10.0 GeV and are compared with experimental
data.
| [
{
"created": "Tue, 3 Mar 2009 16:16:45 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Mar 2009 18:40:23 GMT",
"version": "v2"
},
{
"created": "Thu, 7 May 2009 11:30:20 GMT",
"version": "v3"
}
] | 2009-09-02 | [
[
"Paschos",
"E. A.",
""
],
[
"Schalla",
"Dario",
""
]
] | In this paper we present quantitative results for coherent pion production by neutrinos scattered off nuclei within the framework developed by Gounaris, Kartavtsev and Paschos. The method is based on PCAC and uses helicity cross sections for the scattering of weak gauge bosons on nuclei. The process relies on experimental data for elastic pion-nucleus scattering. A detailed analysis of the differential and integrated cross sections is presented for neutral and charged currents, with special emphasis on the regions of integrations. The results are extended to energies of 10.0 GeV and are compared with experimental data. |
2105.14854 | Moha Ouali | M. Ouali, M. Ouhammou, S. Taj and B. Manaut | $Z$-boson production via the weak process $e^+e^- \to \mu^+\mu^-$ in the
presence of a circularly polarized laser field | 26 pages, 8 figures | null | 10.1016/j.cjph.2021.10.007 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | In the centre of mass frame, we have studied theoretically the $Z$-boson
resonant production in the presence of an intense laser field via the weak
process $e^+e^- \to \mu^+\mu^-$. Dressing the incident particles by a
Circularly Polarized laser field (CP-laser field), at the first step, shows
that for a given laser field's parameters, the $Z$- boson cross section
decreases by several orders of magnitude. We have compared the the Total Cross
Section (TCS) obtained by using the scattering matrix method with that given by
the Breit-Wigner approach in the presence of a CP-laser field and the results
are found to be very consistent. This result indicates that Breit-Wigner
formula is valid not only for the laser-free process but also in the presence
of a CP-laser field. The dependence of the laser-assisted differential cross
section on the Centre of Mass Energy (CME) for different scattering angles
proves that it reaches its maximum for small and high scattering angles. At the
next step and by dressing both incident and scattered particles, we have shown
that the CP-laser field largely affects the TCS, especially when its strength
reaches $10^{9}\,V.cm^{-1}$. This result confirms that obtained for the elastic
electron-proton scattering in the presence of a CP-laser field [I. Dahiri et
al., arXiv:2102.00722v1]. It is interpreted by the fact that heavy interacting
particles require high laser field's intensity to affect the collision's cross
section.
| [
{
"created": "Mon, 31 May 2021 10:09:51 GMT",
"version": "v1"
}
] | 2022-04-27 | [
[
"Ouali",
"M.",
""
],
[
"Ouhammou",
"M.",
""
],
[
"Taj",
"S.",
""
],
[
"Manaut",
"B.",
""
]
] | In the centre of mass frame, we have studied theoretically the $Z$-boson resonant production in the presence of an intense laser field via the weak process $e^+e^- \to \mu^+\mu^-$. Dressing the incident particles by a Circularly Polarized laser field (CP-laser field), at the first step, shows that for a given laser field's parameters, the $Z$- boson cross section decreases by several orders of magnitude. We have compared the the Total Cross Section (TCS) obtained by using the scattering matrix method with that given by the Breit-Wigner approach in the presence of a CP-laser field and the results are found to be very consistent. This result indicates that Breit-Wigner formula is valid not only for the laser-free process but also in the presence of a CP-laser field. The dependence of the laser-assisted differential cross section on the Centre of Mass Energy (CME) for different scattering angles proves that it reaches its maximum for small and high scattering angles. At the next step and by dressing both incident and scattered particles, we have shown that the CP-laser field largely affects the TCS, especially when its strength reaches $10^{9}\,V.cm^{-1}$. This result confirms that obtained for the elastic electron-proton scattering in the presence of a CP-laser field [I. Dahiri et al., arXiv:2102.00722v1]. It is interpreted by the fact that heavy interacting particles require high laser field's intensity to affect the collision's cross section. |
hep-ph/0605116 | Anatoly Radyushkin | A. V. Radyushkin | Holographic Wave Functions, Meromorphization and Counting Rules | Final version published in Physics Letters B | Phys.Lett.B642:459-468,2006 | 10.1016/j.physletb.2006.10.008 | JLAB-THY-06-492 | hep-ph | null | We study the large-Q^2 behavior of the meson form factor F_M (Q^2)
constructed using the holographic light-front wave functions proposed recently
by Brodsky and de Teramond. We show that this model can be also obtained within
the Migdal's regularization approach (``meromorphization''), if one applies it
to 3-point function for scalar currents made of scalar quarks. We found that
the asymptotic 1/Q^2 behavior of F_M (Q^2) is generated by soft Feynman
mechanism rather than by short distance dynamics, which causes very late onset
of the 1/Q^2 asymptotic behavior. Using meromorphization for spin-1/2 quarks,
we demonstrated that resulting form factor F^{spinor}_M (Q^2) has 1/Q^4
asymptotic behavior. Now, owing to the late onset of this asymptotic pattern,
F^{spinor}_M (Q^2) imitates the 1/Q^2 behavior in the few GeV^2 region.
We discuss analogy between meromorphization and local quark-hadron duality
model for the pion form factor, and show that adding the O(\alpha_s) correction
to the spectral function brings in the hard pQCD contribution that has the
dimensional counting $1/Q^2$ behavior at large Q^2. At accessible Q^2, the
O(\alpha_s) term is a rather small fraction of the total result. We conclude
that the ``observed'' quark counting rules for hadronic form factors is an
approximate phenomenon resulting from Feynman mechanism in its preasymptotic
regime.
| [
{
"created": "Wed, 10 May 2006 15:45:30 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Jun 2006 20:32:07 GMT",
"version": "v2"
},
{
"created": "Thu, 24 May 2007 17:33:47 GMT",
"version": "v3"
}
] | 2014-11-18 | [
[
"Radyushkin",
"A. V.",
""
]
] | We study the large-Q^2 behavior of the meson form factor F_M (Q^2) constructed using the holographic light-front wave functions proposed recently by Brodsky and de Teramond. We show that this model can be also obtained within the Migdal's regularization approach (``meromorphization''), if one applies it to 3-point function for scalar currents made of scalar quarks. We found that the asymptotic 1/Q^2 behavior of F_M (Q^2) is generated by soft Feynman mechanism rather than by short distance dynamics, which causes very late onset of the 1/Q^2 asymptotic behavior. Using meromorphization for spin-1/2 quarks, we demonstrated that resulting form factor F^{spinor}_M (Q^2) has 1/Q^4 asymptotic behavior. Now, owing to the late onset of this asymptotic pattern, F^{spinor}_M (Q^2) imitates the 1/Q^2 behavior in the few GeV^2 region. We discuss analogy between meromorphization and local quark-hadron duality model for the pion form factor, and show that adding the O(\alpha_s) correction to the spectral function brings in the hard pQCD contribution that has the dimensional counting $1/Q^2$ behavior at large Q^2. At accessible Q^2, the O(\alpha_s) term is a rather small fraction of the total result. We conclude that the ``observed'' quark counting rules for hadronic form factors is an approximate phenomenon resulting from Feynman mechanism in its preasymptotic regime. |
1203.6825 | Helen Matskevich | S.M. Gerasyuta and E.E. Matskevich | Heavy baryonia | 3 pages | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The relativistic six-quark equations are found in the framework of the
dispersion relation technique. The charmed baryonia $B\bar B$ are constructed
without the mixing of the quarks and antiquarks. The relativistic six-quark
amplitudes of the heavy baryonia are calculated. The poles of these amplitudes
determine the masses of baryonia. 8 masses of charmed baryonia are predicted.
| [
{
"created": "Fri, 30 Mar 2012 14:01:30 GMT",
"version": "v1"
}
] | 2012-04-02 | [
[
"Gerasyuta",
"S. M.",
""
],
[
"Matskevich",
"E. E.",
""
]
] | The relativistic six-quark equations are found in the framework of the dispersion relation technique. The charmed baryonia $B\bar B$ are constructed without the mixing of the quarks and antiquarks. The relativistic six-quark amplitudes of the heavy baryonia are calculated. The poles of these amplitudes determine the masses of baryonia. 8 masses of charmed baryonia are predicted. |
1708.03022 | Eligio Lisi | Francesco Capozzi, Eligio Lisi, Antonio Marrone | Probing the neutrino mass ordering with KM3NeT-ORCA: Analysis and
perspectives | 15 pages, including 7 figures. A few paragraphs and references added.
Invited contribution to appear in the JPG Focus Issue on "Neutrino Mass and
Mass Ordering" | null | 10.1088/1361-6471/aa9503 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The discrimination of the two possible options for the neutrino mass ordering
(normal or inverted) is a major goal for current and future neutrino
oscillation experiments. Such goal might be reached by observing
high-statistics energy-angle spectra of events induced by atmospheric neutrinos
and antineutrinos propagating in the Earth matter. Large volume water-Cherenkov
detectors envisaged to this purpose include the so-called KM3NeT-ORCA project
(in seawater) and the IceCube-PINGU project (in ice). Building upon a previous
work focused on PINGU, we study in detail the effects of various systematic
uncertainties on the ORCA sensitivity to the mass ordering, for the reference
configuration with 9 m vertical spacing. We point out the need to control
spectral shape uncertainties at the percent level, the effects of better priors
on the theta-23 mixing parameter, and the benefits of an improved flavor
identification in reconstructed ORCA events.
| [
{
"created": "Wed, 9 Aug 2017 21:47:13 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Oct 2017 15:54:16 GMT",
"version": "v2"
}
] | 2018-02-14 | [
[
"Capozzi",
"Francesco",
""
],
[
"Lisi",
"Eligio",
""
],
[
"Marrone",
"Antonio",
""
]
] | The discrimination of the two possible options for the neutrino mass ordering (normal or inverted) is a major goal for current and future neutrino oscillation experiments. Such goal might be reached by observing high-statistics energy-angle spectra of events induced by atmospheric neutrinos and antineutrinos propagating in the Earth matter. Large volume water-Cherenkov detectors envisaged to this purpose include the so-called KM3NeT-ORCA project (in seawater) and the IceCube-PINGU project (in ice). Building upon a previous work focused on PINGU, we study in detail the effects of various systematic uncertainties on the ORCA sensitivity to the mass ordering, for the reference configuration with 9 m vertical spacing. We point out the need to control spectral shape uncertainties at the percent level, the effects of better priors on the theta-23 mixing parameter, and the benefits of an improved flavor identification in reconstructed ORCA events. |
hep-ph/0107095 | G. Domokos and S. Kovesi-Domokos | G. Domokos and S. Kovesi-Domokos (Johns Hopkins University) | Particle Candidates of Ultrahigh Energy Cosmic Rays | 15 pages, LaTex. Substantially revised to take into account the
discussion at HEP2001, Budapest July 2001 | null | null | JHU-TIPAC 01059 | hep-ph | null | We discuss candidates for trans-GZK cosmic rays observed in a variety of
detectors. Three types of primaries are represented among the abstracts
submitted to this meeting: neutrin os causing a Z-burst, protons arising from
the decay of ultra-heavy metastable particles and neutrinos within the
framework of low scale string-like models of unification. We attempt to
evaluate the relative merits of these schemes. No definite conclusion can be
reached at this time. However, we point out that some schemes are more
credible/predictive than others. Data to be gathered by the Pierre Auger
observatories as well as orbiting detectors (OWL, Airwatch...) should be able
to decide between the various schemes.
| [
{
"created": "Mon, 9 Jul 2001 16:36:34 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Oct 2001 14:56:51 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Domokos",
"G.",
"",
"Johns Hopkins University"
],
[
"Kovesi-Domokos",
"S.",
"",
"Johns Hopkins University"
]
] | We discuss candidates for trans-GZK cosmic rays observed in a variety of detectors. Three types of primaries are represented among the abstracts submitted to this meeting: neutrin os causing a Z-burst, protons arising from the decay of ultra-heavy metastable particles and neutrinos within the framework of low scale string-like models of unification. We attempt to evaluate the relative merits of these schemes. No definite conclusion can be reached at this time. However, we point out that some schemes are more credible/predictive than others. Data to be gathered by the Pierre Auger observatories as well as orbiting detectors (OWL, Airwatch...) should be able to decide between the various schemes. |
1808.08384 | Bartosz Dziewit | Piotr Chaber, Bartosz Dziewit, Jacek Holeczek, Monika Richter, Marek
Zra{\l}ek, Sebastian Zaj\k{a}c | Lepton masses and mixing in a two-Higgs-doublet model | null | Phys. Rev. D 98, 055007 (2018) | 10.1103/PhysRevD.98.055007 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Within the framework of the two-Higgs Doublet Model (2HDM), we attempt to
find some discrete, non-abelian flavour symmetry which could provide an
explanation for the masses and mixing matrix elements of leptons. Unlike the
Standard Model, currently there is no need for the flavour symmetry to be
broken. With the GAP program we investigate all finite subgroups of the U3
group up to the order of 1025. Up to such an order there is no group for which
it is possible to select free model parameters in order to match the masses of
charged leptons, masses of neutrinos, and the Pontecorvo-Maki-Nakagawa-Sakata
mixing matrix elements in a satisfactory manner.
| [
{
"created": "Sat, 25 Aug 2018 09:13:04 GMT",
"version": "v1"
}
] | 2018-09-12 | [
[
"Chaber",
"Piotr",
""
],
[
"Dziewit",
"Bartosz",
""
],
[
"Holeczek",
"Jacek",
""
],
[
"Richter",
"Monika",
""
],
[
"Zrałek",
"Marek",
""
],
[
"Zając",
"Sebastian",
""
]
] | Within the framework of the two-Higgs Doublet Model (2HDM), we attempt to find some discrete, non-abelian flavour symmetry which could provide an explanation for the masses and mixing matrix elements of leptons. Unlike the Standard Model, currently there is no need for the flavour symmetry to be broken. With the GAP program we investigate all finite subgroups of the U3 group up to the order of 1025. Up to such an order there is no group for which it is possible to select free model parameters in order to match the masses of charged leptons, masses of neutrinos, and the Pontecorvo-Maki-Nakagawa-Sakata mixing matrix elements in a satisfactory manner. |
0911.2333 | Michael Buballa | Michael Buballa and Dominik Nickel | Inhomogeneous phases of strongly interacting matter | 10 pages, 4 figures. Talk presented at the EMMI workshop and XXVI Max
Born Symposium "Three Days of Strong Interactions", Wroclaw, Poland, July
9-11, 2009 | Acta Phys.Polon.Supp.3:523-532,2010 | null | MIT-CTP 4084, INT-PUB-09-057 | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss possible inhomogeneous phases in two regions of the QCD phase
diagram: We begin with color superconducting quark matter at moderately high
densities, which is an imbalanced Fermi system due to the finite strange quark
mass and neutrality constraints. Within an NJL-type toy model we find that this
situation could lead to the formation of a soliton lattice. Similar solutions
also exist in the context of the chiral phase transition. As an interesting
result, the first-order transition line in the phase diagram of homogeneous
phases gets replaced by an inhomogeneous phase which is bordered by two
second-order transition lines.
| [
{
"created": "Thu, 12 Nov 2009 09:27:58 GMT",
"version": "v1"
}
] | 2010-11-02 | [
[
"Buballa",
"Michael",
""
],
[
"Nickel",
"Dominik",
""
]
] | We discuss possible inhomogeneous phases in two regions of the QCD phase diagram: We begin with color superconducting quark matter at moderately high densities, which is an imbalanced Fermi system due to the finite strange quark mass and neutrality constraints. Within an NJL-type toy model we find that this situation could lead to the formation of a soliton lattice. Similar solutions also exist in the context of the chiral phase transition. As an interesting result, the first-order transition line in the phase diagram of homogeneous phases gets replaced by an inhomogeneous phase which is bordered by two second-order transition lines. |
hep-ph/0408153 | Marcos Rodriguez Cardoso | M. C. Rodriguez | Proton decay in Supersymmetric 331 Model | 17 pages, 9 figures. submited to European Physical Journal | null | null | null | hep-ph | null | The aim of this paper is to discuss what sort of baryon-number violating
process arise on the supersymmetric versions of the model based on the gauge
group $SU(3)_C}\otimes SU(3)_{L}\otimes U(1)_{N}$. We discuss the mechanism of
baryon number violation which induces proton decay, and derive bounds on the
relevant couplings.
| [
{
"created": "Thu, 12 Aug 2004 19:08:33 GMT",
"version": "v1"
},
{
"created": "Thu, 12 Aug 2004 21:03:19 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Rodriguez",
"M. C.",
""
]
] | The aim of this paper is to discuss what sort of baryon-number violating process arise on the supersymmetric versions of the model based on the gauge group $SU(3)_C}\otimes SU(3)_{L}\otimes U(1)_{N}$. We discuss the mechanism of baryon number violation which induces proton decay, and derive bounds on the relevant couplings. |
2301.07168 | Vitaly Yermolchyk | A. Arbuzov, J. Gluza, L. Kalinovskaya, S. Riemann, T. Riemann, V.
Yermolchyk | Computer package DIZET v. 6.45 | 14 pages, 3 figures, 8 tables | null | 10.1016/j.cpc.2023.108846 | null | hep-ph | http://creativecommons.org/licenses/by-sa/4.0/ | The new version of the DIZET electroweak library is described. Changes and
additional code features concerning the previous version are explained. The
software allows one to make state-of-the-art theoretical predictions for
pseudo-observable quantities, including higher-order radiative corrections. The
current version of the DIZET library v. 6.45 incorporates advanced recent
results of theoretical calculations. Numerical comparisons with the results of
the previous version are performed. Estimates of theoretical uncertainties are
discussed.
| [
{
"created": "Tue, 17 Jan 2023 20:30:45 GMT",
"version": "v1"
}
] | 2023-08-09 | [
[
"Arbuzov",
"A.",
""
],
[
"Gluza",
"J.",
""
],
[
"Kalinovskaya",
"L.",
""
],
[
"Riemann",
"S.",
""
],
[
"Riemann",
"T.",
""
],
[
"Yermolchyk",
"V.",
""
]
] | The new version of the DIZET electroweak library is described. Changes and additional code features concerning the previous version are explained. The software allows one to make state-of-the-art theoretical predictions for pseudo-observable quantities, including higher-order radiative corrections. The current version of the DIZET library v. 6.45 incorporates advanced recent results of theoretical calculations. Numerical comparisons with the results of the previous version are performed. Estimates of theoretical uncertainties are discussed. |
hep-ph/0301206 | Silvano Simula | R. Petronzio, S. Simula and G. Ricco | Possible evidence of extended objects inside the proton | 1 reference added | Phys.Rev.D67:094004,2003; Erratum-ibid.D68:099901,2003 | 10.1103/PhysRevD.67.094004 10.1103/PhysRevD.68.099901 | preprint RM3-TH/03-3 | hep-ph nucl-th | null | Recent experimental determinations of the Nachtmann moments of the inelastic
structure function of the proton F2p(x, Q**2), obtained at Jefferson Lab, are
analyzed for values of the squared four-momentum transfer Q**2 ranging from ~
0.1 to ~ 2 (GeV/c)**2. It is shown that such inelastic proton data exhibit a
new type of scaling behavior and that the resulting scaling function can be
interpreted as a constituent form factor consistent with the elastic nucleon
data. These findings suggest that at low momentum transfer the inclusive proton
structure function originates mainly from the elastic coupling with extended
objects inside the proton. We obtain a constituent size of ~ 0.2 - 0.3 fm.
| [
{
"created": "Thu, 23 Jan 2003 17:17:16 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Jan 2003 07:49:02 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Petronzio",
"R.",
""
],
[
"Simula",
"S.",
""
],
[
"Ricco",
"G.",
""
]
] | Recent experimental determinations of the Nachtmann moments of the inelastic structure function of the proton F2p(x, Q**2), obtained at Jefferson Lab, are analyzed for values of the squared four-momentum transfer Q**2 ranging from ~ 0.1 to ~ 2 (GeV/c)**2. It is shown that such inelastic proton data exhibit a new type of scaling behavior and that the resulting scaling function can be interpreted as a constituent form factor consistent with the elastic nucleon data. These findings suggest that at low momentum transfer the inclusive proton structure function originates mainly from the elastic coupling with extended objects inside the proton. We obtain a constituent size of ~ 0.2 - 0.3 fm. |
hep-ph/9306331 | null | Martin Lavelle and David McMullan | On Quark Confinement | 5 pages, MZ-TH/93-03, DIAS-STP-93-04 | null | null | null | hep-ph | null | A sufficient condition for the confinement of quarks is presented. Quarks are
shown to be unobservable. Colour singlets are however, observables. The results
of deep inelastic scattering are discussed. We argue that QCD does not exhibit
a deconfining transition.
| [
{
"created": "Wed, 30 Jun 1993 10:57:10 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Lavelle",
"Martin",
""
],
[
"McMullan",
"David",
""
]
] | A sufficient condition for the confinement of quarks is presented. Quarks are shown to be unobservable. Colour singlets are however, observables. The results of deep inelastic scattering are discussed. We argue that QCD does not exhibit a deconfining transition. |
hep-ph/0510231 | Kacper Zalewski | K. Zalewski | Invariance group important for the interpretation of Bose-Einstein
correlations | LaTeX, 8 pages, no figures, report at the WPCF conference, Kromeriz,
15-17 Auigust 2005 | null | 10.1063/1.2197454 | null | hep-ph | null | A group of transformations changing the phases of the elements of the
single-particle density matrix, but leaving unchanged the predictions for
identical particles concerning the momentum distributions, momentum
correlations etc., is identified. Its implications for the determinations of
the interaction regions from studies of Bose-Einstein correlations are
discussed.
| [
{
"created": "Tue, 18 Oct 2005 14:17:08 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Zalewski",
"K.",
""
]
] | A group of transformations changing the phases of the elements of the single-particle density matrix, but leaving unchanged the predictions for identical particles concerning the momentum distributions, momentum correlations etc., is identified. Its implications for the determinations of the interaction regions from studies of Bose-Einstein correlations are discussed. |
0802.2452 | Jun'ichi Yokoyama | Kazunori Nakayama, Shun Saito, Yudai Suwa, and Jun'ichi Yokoyama | Space laser interferometers can determine the thermal history of the
early Universe | 5 pages | Phys.Rev.D77:124001,2008 | 10.1103/PhysRevD.77.124001 | RESCEU-2/08,UTAP-594 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is shown that space-based gravitational wave detectors such as DECIGO
and/or Big Bang Observer (BBO) will provide us with invaluable information on
the cosmic thermal history after inflation and they will be able to determine
the reheat temperature $T_R$ provided that it lies in the range preferred by
the cosmological gravitino problem, $T_R\sim 10^{5-9}$ GeV. Therefore it is
strongly desired that they will be put into practice as soon as possible.
| [
{
"created": "Mon, 18 Feb 2008 11:59:24 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Nakayama",
"Kazunori",
""
],
[
"Saito",
"Shun",
""
],
[
"Suwa",
"Yudai",
""
],
[
"Yokoyama",
"Jun'ichi",
""
]
] | It is shown that space-based gravitational wave detectors such as DECIGO and/or Big Bang Observer (BBO) will provide us with invaluable information on the cosmic thermal history after inflation and they will be able to determine the reheat temperature $T_R$ provided that it lies in the range preferred by the cosmological gravitino problem, $T_R\sim 10^{5-9}$ GeV. Therefore it is strongly desired that they will be put into practice as soon as possible. |
1312.7207 | Ya-Juan Zheng | Chian-Shu Chen and Ya-Juan Zheng | LHC Signatures for Cascade Seesaw Mechanism | 16 pages, 5 figures, 1 table | null | 10.1093/ptep/ptv134 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Cascade seesaw mechanism generates neutrino mass at higher dimension (5+4n)
operators through tree level diagram which bring the seesaw scale down to TeV
and provide collider signatures within LHC reach. In particular, both Type-II
scalar and Type-III heavy fermion seesaw signatures exist in such a scenario.
Doubly charged scalar decays into diboson is dominant. We perform a thorough
study on the LHC signals and the Standard Model background. We draw the
conclusion that multilepton final state from interplay of doubly charged scalar
and heavy fermion can provide distinguishable signatures from conventional
seesaw mechanisms.
| [
{
"created": "Fri, 27 Dec 2013 07:43:32 GMT",
"version": "v1"
}
] | 2016-06-21 | [
[
"Chen",
"Chian-Shu",
""
],
[
"Zheng",
"Ya-Juan",
""
]
] | Cascade seesaw mechanism generates neutrino mass at higher dimension (5+4n) operators through tree level diagram which bring the seesaw scale down to TeV and provide collider signatures within LHC reach. In particular, both Type-II scalar and Type-III heavy fermion seesaw signatures exist in such a scenario. Doubly charged scalar decays into diboson is dominant. We perform a thorough study on the LHC signals and the Standard Model background. We draw the conclusion that multilepton final state from interplay of doubly charged scalar and heavy fermion can provide distinguishable signatures from conventional seesaw mechanisms. |
hep-ph/9705251 | Igor Halperin | Igor Halperin and Ariel Zhitnitsky | Why is the B -> eta' X decay width so large ? | Comments on a mixing model for intrinsic charm and pre-asymptotic
effects and some references are added. Latex, 9 pages | Phys.Rev.Lett. 80 (1998) 438-441 | 10.1103/PhysRevLett.80.438 | null | hep-ph hep-ex | null | New mechanism for the observed inclusive B -> \eta'X decay is suggested. We
argue that the dominant contribution to this amplitude is due to the Cabbibo
favored b -> \bar{c}cs process followed by the transition \bar{c}c -> \eta'. A
large magnitude of the "intrinsic charm" component of \eta' is of critical
importance in our approach. Our results are consistent with an unexpectedly
large Br(B -> \eta'+X) \sim 10^{-3} recently announced by CLEO. We stress the
uniqueness of this channel for 0^{-+} gluonia search.
| [
{
"created": "Wed, 7 May 1997 20:16:17 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Sep 1997 22:38:13 GMT",
"version": "v2"
}
] | 2009-10-30 | [
[
"Halperin",
"Igor",
""
],
[
"Zhitnitsky",
"Ariel",
""
]
] | New mechanism for the observed inclusive B -> \eta'X decay is suggested. We argue that the dominant contribution to this amplitude is due to the Cabbibo favored b -> \bar{c}cs process followed by the transition \bar{c}c -> \eta'. A large magnitude of the "intrinsic charm" component of \eta' is of critical importance in our approach. Our results are consistent with an unexpectedly large Br(B -> \eta'+X) \sim 10^{-3} recently announced by CLEO. We stress the uniqueness of this channel for 0^{-+} gluonia search. |
1907.11220 | Li-Sheng Geng | Ya-Wen Pan, Ming-Zhu Liu, Fang-Zheng Peng, Mario S\'anchez S\'anchez,
Li-Sheng Geng, and Manuel Pavon Valderrama | Model independent determination of the spins of the $P_{c}$(4440) and
$P_{c}$(4457) from the spectroscopy of the triply charmed dibaryons | 6 pages, 1 figure, 3 tables | Phys. Rev. D 102, 011504 (2020) | 10.1103/PhysRevD.102.011504 | null | hep-ph hep-ex hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The LHCb collaboration has recently observed three narrow pentaquark states
--- the $P_c(4312)$, $P_c(4440)$, and $P_c(4457)$ ---that are located close to
the $\bar{D} \Sigma_c$ and $\bar{D}^* \Sigma_c$ thresholds. Among the so-far
proposed theoretical interpretations for these pentaquarks, the molecular
hypothesis seems to be the preferred one. Nevertheless, in the molecular
picture the spins of the $P_c(4440)$ and $P_c(4457)$ have not been
unambiguously determined yet. In this letter we point out that heavy
antiquark-diquark symmetry induces a model-independent relation between the
spin-splitting in the masses of the $P_c(4440)$ and $P_c(4457)$ $\bar{D}^*
\Sigma_c$ pentaquarks and the corresponding splitting for the $0^+$ and $1^+$
$\Xi_{cc} \Sigma_c$ triply charmed dibaryons. This is particularly relevant
owing to a recent lattice QCD prediction of the $1^+$ triply charmed dibaryon,
which suggests that a calculation of the mass of its $0^+$ partner might be
within reach. This in turn would reveal the spins of the $P_c(4440)$ and
$P_c(4457)$ pentaquarks, providing a highly nontrivial test of heavy-quark
symmetry and the molecular nature of the pentaquarks. Furthermore, the
molecular interpretation of the hidden-charm pentaquarks implies the existence
of a total of ten triply charmed dibaryons as $\Xi_{cc}^{(*)} \Sigma_c^{(*)}$
molecules, which, if confirmed in the lattice, will largely expand our
understanding of the non-perturbative strong interaction in the heavy-quark
sector.
| [
{
"created": "Thu, 25 Jul 2019 17:44:07 GMT",
"version": "v1"
}
] | 2020-08-05 | [
[
"Pan",
"Ya-Wen",
""
],
[
"Liu",
"Ming-Zhu",
""
],
[
"Peng",
"Fang-Zheng",
""
],
[
"Sánchez",
"Mario Sánchez",
""
],
[
"Geng",
"Li-Sheng",
""
],
[
"Valderrama",
"Manuel Pavon",
""
]
] | The LHCb collaboration has recently observed three narrow pentaquark states --- the $P_c(4312)$, $P_c(4440)$, and $P_c(4457)$ ---that are located close to the $\bar{D} \Sigma_c$ and $\bar{D}^* \Sigma_c$ thresholds. Among the so-far proposed theoretical interpretations for these pentaquarks, the molecular hypothesis seems to be the preferred one. Nevertheless, in the molecular picture the spins of the $P_c(4440)$ and $P_c(4457)$ have not been unambiguously determined yet. In this letter we point out that heavy antiquark-diquark symmetry induces a model-independent relation between the spin-splitting in the masses of the $P_c(4440)$ and $P_c(4457)$ $\bar{D}^* \Sigma_c$ pentaquarks and the corresponding splitting for the $0^+$ and $1^+$ $\Xi_{cc} \Sigma_c$ triply charmed dibaryons. This is particularly relevant owing to a recent lattice QCD prediction of the $1^+$ triply charmed dibaryon, which suggests that a calculation of the mass of its $0^+$ partner might be within reach. This in turn would reveal the spins of the $P_c(4440)$ and $P_c(4457)$ pentaquarks, providing a highly nontrivial test of heavy-quark symmetry and the molecular nature of the pentaquarks. Furthermore, the molecular interpretation of the hidden-charm pentaquarks implies the existence of a total of ten triply charmed dibaryons as $\Xi_{cc}^{(*)} \Sigma_c^{(*)}$ molecules, which, if confirmed in the lattice, will largely expand our understanding of the non-perturbative strong interaction in the heavy-quark sector. |
1309.3991 | Jambul Gegelia | D. Djukanovic, E. Epelbaum, J.Gegelia, U.-G. Mei{\ss}ner | The magnetic moment of the \rho-meson | 10 pages, 4 figures | null | 10.1016/j.physletb.2014.01.001 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The magnetic moment of the \rho-meson is calculated in the framework of a
low-energy effective field theory of the strong interactions. We find that the
complex-valued strong interaction corrections to the gyromagnetic ratio are
small leading to a value close to the real leading tree level result, g_\rho =
2. This is in a reasonably good agreement with the available lattice QCD
calculations for this quantity.
| [
{
"created": "Mon, 16 Sep 2013 15:05:26 GMT",
"version": "v1"
}
] | 2015-06-17 | [
[
"Djukanovic",
"D.",
""
],
[
"Epelbaum",
"E.",
""
],
[
"Gegelia",
"J.",
""
],
[
"Meißner",
"U. -G.",
""
]
] | The magnetic moment of the \rho-meson is calculated in the framework of a low-energy effective field theory of the strong interactions. We find that the complex-valued strong interaction corrections to the gyromagnetic ratio are small leading to a value close to the real leading tree level result, g_\rho = 2. This is in a reasonably good agreement with the available lattice QCD calculations for this quantity. |
hep-ph/0505219 | Nigel Glover | T.G. Birthwright, E.W.N. Glover, V.V. Khoze and P. Marquard | Collinear Limits in QCD from MHV Rules | 27 pages, 5 figures, JHEP3.cls | JHEP0507:068,2005 | 10.1088/1126-6708/2005/07/068 | IPPP/05/22 | hep-ph hep-th | null | We consider multi-parton collinear limits of QCD amplitudes at tree level.
Using the MHV formalism we specify the underlying analytic structure of the
resulting multi-collinear splitting functions. We derive general results for
these splitting functions that are valid for specific numbers of negative
helicity partons and an arbitrary number of positive helicity partons (or vice
versa).
| [
{
"created": "Wed, 25 May 2005 16:19:58 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Birthwright",
"T. G.",
""
],
[
"Glover",
"E. W. N.",
""
],
[
"Khoze",
"V. V.",
""
],
[
"Marquard",
"P.",
""
]
] | We consider multi-parton collinear limits of QCD amplitudes at tree level. Using the MHV formalism we specify the underlying analytic structure of the resulting multi-collinear splitting functions. We derive general results for these splitting functions that are valid for specific numbers of negative helicity partons and an arbitrary number of positive helicity partons (or vice versa). |
hep-ph/0010203 | Stefano Scopel | A. Bottino (1), F. Donato (2), N. Fornengo (1), S. Scopel (1) ((1)
Torino U./INFN, (2) LAPP-Annecy) | Probing the supersymmetric parameter space by WIMP direct detection | 23 pages, 5 figures, typeset with ReVTeX. Updated to match version
accepted for publication in PRD. The version on the archive has low
resolution figures. The paper with high-resolution figures can be found at
http://www.to.infn.it/~fornengo/papers/probing.ps.gz | Phys.Rev.D63:125003,2001 | 10.1103/PhysRevD.63.125003 | DFTT 35/2000, LAPTH-816/2000 | hep-ph astro-ph | null | We discuss to which extent the present experiments of direct search for
WIMPs, when interpreted in terms of relic neutralinos, probe interesting
regions of the supersymmetric parameter space, which are also being
progressively explored at accelerators. Our analysis is performed in a number
of different supersymmetric schemes. We derive the relevant neutralino
cosmological properties, locally and on the average in the universe. We prove
that part of the susy configurations probed by current WIMP experiments entail
relic neutralinos of cosmological interest. The main astrophysical and particle
physics uncertainties, relevant for a proper comparison between theory and
experimental data, are stressed and taken into account.
| [
{
"created": "Wed, 18 Oct 2000 10:11:59 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Apr 2001 08:05:59 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Bottino",
"A.",
""
],
[
"Donato",
"F.",
""
],
[
"Fornengo",
"N.",
""
],
[
"Scopel",
"S.",
""
]
] | We discuss to which extent the present experiments of direct search for WIMPs, when interpreted in terms of relic neutralinos, probe interesting regions of the supersymmetric parameter space, which are also being progressively explored at accelerators. Our analysis is performed in a number of different supersymmetric schemes. We derive the relevant neutralino cosmological properties, locally and on the average in the universe. We prove that part of the susy configurations probed by current WIMP experiments entail relic neutralinos of cosmological interest. The main astrophysical and particle physics uncertainties, relevant for a proper comparison between theory and experimental data, are stressed and taken into account. |
2008.09730 | TseChun Wang | Zhuojun Hu, Jiajie Ling, Jian Tang, TseChun Wang | Global oscillation data analysis on the $3\nu$ mixing without unitarity | null | null | 10.1007/JHEP01(2021)124 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present results of a combined analysis in neutrino oscillations without
unitarity assumption in the $3\nu$ mixing picture. Constraints on neutrino
mixing matrix elements are based on recent data from the reactor, solar and
long-baseline accelerator neutrino oscillation experiments. The current data
are consistent with the standard $3\nu$ scheme. The precision on different
matrix elements can be as good as a few percent at $3\sigma$ CL, and is mainly
limited by the experimental statistical uncertainty. The $\nu_e$ related
elements are the most precisely measured among all sectors with the
uncertainties $<20\%$. The measured leptonic CP violation is very close to the
one assuming the standard $3\nu$ mixing. The deviations on normalization and
the unitarity triangle closure are confined within $\mathcal{O}(10^{-3})$,
$\mathcal{O}(10^{-2})$ and $\mathcal{O}(10^{-1})$, for $\nu_e$, $\nu_{\mu}$ and
$\nu_{\tau}$ sectors, respectively. We look forward to the next-generation
neutrino oscillation experiments \textit{such as} DUNE, T2HK, and JUNO,
especially the precise measurements on $\nu_\tau$ oscillations, to
significantly improve the precision of unitarity test on the $3\nu$ mixing
matrix.
| [
{
"created": "Sat, 22 Aug 2020 01:59:19 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Sep 2020 06:49:24 GMT",
"version": "v2"
}
] | 2021-02-24 | [
[
"Hu",
"Zhuojun",
""
],
[
"Ling",
"Jiajie",
""
],
[
"Tang",
"Jian",
""
],
[
"Wang",
"TseChun",
""
]
] | We present results of a combined analysis in neutrino oscillations without unitarity assumption in the $3\nu$ mixing picture. Constraints on neutrino mixing matrix elements are based on recent data from the reactor, solar and long-baseline accelerator neutrino oscillation experiments. The current data are consistent with the standard $3\nu$ scheme. The precision on different matrix elements can be as good as a few percent at $3\sigma$ CL, and is mainly limited by the experimental statistical uncertainty. The $\nu_e$ related elements are the most precisely measured among all sectors with the uncertainties $<20\%$. The measured leptonic CP violation is very close to the one assuming the standard $3\nu$ mixing. The deviations on normalization and the unitarity triangle closure are confined within $\mathcal{O}(10^{-3})$, $\mathcal{O}(10^{-2})$ and $\mathcal{O}(10^{-1})$, for $\nu_e$, $\nu_{\mu}$ and $\nu_{\tau}$ sectors, respectively. We look forward to the next-generation neutrino oscillation experiments \textit{such as} DUNE, T2HK, and JUNO, especially the precise measurements on $\nu_\tau$ oscillations, to significantly improve the precision of unitarity test on the $3\nu$ mixing matrix. |
0804.3479 | Leonard Lesniak | L. Lesniak | New formula for a resonant scattering near an inelastic threshold | 6 pages, 2 figures, contributed to SCADRON 70, Workshop on Scalar
Mesons and Related Topics, February 11-16, 2008, Lisbon, Portugal | AIPConf.Proc.1030:238-243,2008 | 10.1063/1.2973505 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the Flatte formula is not adequate to interpret precision data
on a resonance production near an inelastic threshold. A unitary
parameterization, satisfying generalized Watson's theorem for the production
amplitudes, is proposed to replace the Flatte parameterization in
phenomenological analyses of experimental data.
| [
{
"created": "Tue, 22 Apr 2008 09:32:29 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Lesniak",
"L.",
""
]
] | We show that the Flatte formula is not adequate to interpret precision data on a resonance production near an inelastic threshold. A unitary parameterization, satisfying generalized Watson's theorem for the production amplitudes, is proposed to replace the Flatte parameterization in phenomenological analyses of experimental data. |
hep-ph/0507059 | Andrei Afanasev | Andrei V. Afanasev, M.I. Konchatnij and N.P. Merenkov | Single--Spin Asymmetries in the Bethe--Heitler Process $e^- + p \to e^-
+ \gamma + p$ from QED Radiative Corrections | 8 pages, 9 figures | J.Exp.Theor.Phys.102:220-233,2006 | 10.1134/S1063776106020038 | JLAB-PHY-05-379 | hep-ph | null | We derived analytic formulae for the polarization single--spin asymmetries
(SSA) in the Bethe--Heitler process $e^- + p \to e^- + \gamma + p$. The
asymmetries arise due to one-loop QED radiative corrections to the leptonic
part of the interaction and present a systematic correction for the studies of
virtual Compton Scattering on a proton through interference with the
Bethe-Heitler amplitude. Considered are SSA with either longitudinally
polarized electron beam or a polarized proton target. The computed effect
appears to be small, not exceeding 0.1 per cent for kinematics of current
virtual Compton scattering experiments.
| [
{
"created": "Tue, 5 Jul 2005 14:59:00 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Afanasev",
"Andrei V.",
""
],
[
"Konchatnij",
"M. I.",
""
],
[
"Merenkov",
"N. P.",
""
]
] | We derived analytic formulae for the polarization single--spin asymmetries (SSA) in the Bethe--Heitler process $e^- + p \to e^- + \gamma + p$. The asymmetries arise due to one-loop QED radiative corrections to the leptonic part of the interaction and present a systematic correction for the studies of virtual Compton Scattering on a proton through interference with the Bethe-Heitler amplitude. Considered are SSA with either longitudinally polarized electron beam or a polarized proton target. The computed effect appears to be small, not exceeding 0.1 per cent for kinematics of current virtual Compton scattering experiments. |
hep-ph/9408240 | Arnd Leike | A. Leike, R. Rueckl | Production of Heavy Bound States at LEP and Beyond | 10 pages, MPI-PhT/94-41,LMU-10/94, Normalization in figure 6 and
discussion to figure 6 changed | Nucl.Phys.Proc.Suppl.37B:215-221,1994 | 10.1016/0920-5632(94)90678-5 | null | hep-ph | null | We describe some characteristic properties of $B_c$ mesons and discuss the
production and the prospects of detection in $e^+ e^-$, $\gamma \gamma$, and
$\bar pp/pp$ collisions. The production mechanisms considered here also play an
important role in charmonium and bottomonium production.
| [
{
"created": "Fri, 5 Aug 1994 13:42:51 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Aug 1994 13:19:35 GMT",
"version": "v2"
},
{
"created": "Wed, 5 Oct 1994 10:18:53 GMT",
"version": "v3"
}
] | 2010-11-01 | [
[
"Leike",
"A.",
""
],
[
"Rueckl",
"R.",
""
]
] | We describe some characteristic properties of $B_c$ mesons and discuss the production and the prospects of detection in $e^+ e^-$, $\gamma \gamma$, and $\bar pp/pp$ collisions. The production mechanisms considered here also play an important role in charmonium and bottomonium production. |
hep-ph/9707273 | Antonio Riotto | D.H. Lyth and A. Riotto | Comments on D-term inflation | 13 pages, LaTeX file | Phys.Lett. B412 (1997) 28-34 | 10.1016/S0370-2693(97)01044-7 | FERMILAB-Pub-96/236-A | hep-ph astro-ph | null | An inflationary stage dominated by a D-term avoids the slow-roll problem of
inflation in supergravity and can naturally emerge in theories with a
non-anomalous or anomalous U(1) gauge symmetry. In the latter case, however,
the scale of inflation as imposed by the COBE normalization is in contrast with
the value fixed by the Green-Schwarz mechanism of anomaly cancellation. In this
paper we discuss possible solutions to this problem and comment about the fact
that the string-loop generated Fayet-Iliopoulos D-term may trigger the presence
of global and local cosmic strings at the end of inflation.
| [
{
"created": "Mon, 7 Jul 1997 21:53:19 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Lyth",
"D. H.",
""
],
[
"Riotto",
"A.",
""
]
] | An inflationary stage dominated by a D-term avoids the slow-roll problem of inflation in supergravity and can naturally emerge in theories with a non-anomalous or anomalous U(1) gauge symmetry. In the latter case, however, the scale of inflation as imposed by the COBE normalization is in contrast with the value fixed by the Green-Schwarz mechanism of anomaly cancellation. In this paper we discuss possible solutions to this problem and comment about the fact that the string-loop generated Fayet-Iliopoulos D-term may trigger the presence of global and local cosmic strings at the end of inflation. |
hep-ph/0601095 | Maxim Dvornikov | Maxim Dvornikov | Neutrino spin oscillations in gravitational fields | RevTeX4, 9 pages, 1 esp figure; article was revised, some misprints
were corrected, 6 references added; accepted for publication in
Int.J.Mod.Phys.D | Int.J.Mod.Phys.D15:1017-1034,2006 | 10.1142/S021827180600870X | HUPD 0602 | hep-ph astro-ph gr-qc | null | We study neutrino spin oscillations in gravitational fields. The
quasi-classical approach is used to describe the neutrino spin evolution. First
we examine the case of a weak gravitational field. We obtain the effective
Hamiltonian for the description of neutrino spin oscillations. We also receive
the neutrino transition probability when a particle propagates in the
gravitational field of a rotating massive object. Then we apply the general
technique to the description of neutrino spin oscillations in the Schwarzschild
metric. The neutrino spin evolution equation for the case of the neutrino
motion in the vicinity of a black hole is obtained. The effective Hamiltonian
and the transition probability are also derived. We examine the neutrino
oscillations process on different circular orbits and analyze the frequencies
of spin transitions. The validity of the quasi-classical approach is also
considered.
| [
{
"created": "Thu, 12 Jan 2006 11:23:48 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Apr 2006 13:26:43 GMT",
"version": "v2"
}
] | 2011-09-13 | [
[
"Dvornikov",
"Maxim",
""
]
] | We study neutrino spin oscillations in gravitational fields. The quasi-classical approach is used to describe the neutrino spin evolution. First we examine the case of a weak gravitational field. We obtain the effective Hamiltonian for the description of neutrino spin oscillations. We also receive the neutrino transition probability when a particle propagates in the gravitational field of a rotating massive object. Then we apply the general technique to the description of neutrino spin oscillations in the Schwarzschild metric. The neutrino spin evolution equation for the case of the neutrino motion in the vicinity of a black hole is obtained. The effective Hamiltonian and the transition probability are also derived. We examine the neutrino oscillations process on different circular orbits and analyze the frequencies of spin transitions. The validity of the quasi-classical approach is also considered. |
2403.16191 | Ulas Ozdem | U. \"Ozdem | Unveiling the underlying structure of axial-vector bottom-charm
tetraquarks in the light of their magnetic moments | 12 pages, 2 tables, 1 figure, version accepted for publication in
JHEP | null | null | null | hep-ph hep-ex nucl-ex | http://creativecommons.org/licenses/by/4.0/ | The magnetic moment yields an excellent framework to explore the inner
structure of particles determined by the quark-gluon dynamics of QCD, as it is
the leading-order response of a bound system to a weak external magnetic field.
Motivated by this, in this study, the magnetic moments of possible axial-vector
$T_{bc\bar u \bar u}$, $T_{bc\bar d \bar d}$, and $T_{bc\bar u \bar d}$
tetraquarks are obtained with the help of light-cone QCD sum rules. For this
purpose, we assume that these states are represented as a diquark-antidiquark
picture with different structures and interpolating currents. The magnetic
moment results derived using different diquark-antidiquark configurations
differ substantially from each other. This can be translated into more than one
tetraquark state with the same quantum number and quark content yet possessing
different magnetic moments. From the numerical results obtained, we have
concluded that the magnetic moments of the $T_{bc}$ states can project their
inner structure, which can be used for their quantum numbers and quark-gluon
organization. The contribution of individual quarks to the magnetic moments is
also analyzed for completeness. We hope that our predictions of the magnetic
moments of the $T_{bc}$ tetraquarks, together with the results of other
theoretical investigations of the spectroscopic parameters and decay widths of
these interesting tetraquarks, may be valuable in the search for these states
in future experiments and in unraveling the internal structure of these
tetraquarks.
| [
{
"created": "Sun, 24 Mar 2024 15:15:06 GMT",
"version": "v1"
},
{
"created": "Thu, 2 May 2024 09:59:50 GMT",
"version": "v2"
},
{
"created": "Wed, 8 May 2024 10:41:18 GMT",
"version": "v3"
}
] | 2024-05-09 | [
[
"Özdem",
"U.",
""
]
] | The magnetic moment yields an excellent framework to explore the inner structure of particles determined by the quark-gluon dynamics of QCD, as it is the leading-order response of a bound system to a weak external magnetic field. Motivated by this, in this study, the magnetic moments of possible axial-vector $T_{bc\bar u \bar u}$, $T_{bc\bar d \bar d}$, and $T_{bc\bar u \bar d}$ tetraquarks are obtained with the help of light-cone QCD sum rules. For this purpose, we assume that these states are represented as a diquark-antidiquark picture with different structures and interpolating currents. The magnetic moment results derived using different diquark-antidiquark configurations differ substantially from each other. This can be translated into more than one tetraquark state with the same quantum number and quark content yet possessing different magnetic moments. From the numerical results obtained, we have concluded that the magnetic moments of the $T_{bc}$ states can project their inner structure, which can be used for their quantum numbers and quark-gluon organization. The contribution of individual quarks to the magnetic moments is also analyzed for completeness. We hope that our predictions of the magnetic moments of the $T_{bc}$ tetraquarks, together with the results of other theoretical investigations of the spectroscopic parameters and decay widths of these interesting tetraquarks, may be valuable in the search for these states in future experiments and in unraveling the internal structure of these tetraquarks. |
0810.4573 | Hiroshi Okada | S. Khalil, and H. Okada | Dark Matter in B-L Extended MSSM Models | 11 pages, 9 figures. Published version | Phys.Rev.D79:083510,2009 | 10.1103/PhysRevD.79.083510 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the dark matter problem in the context of supersymmetric
U(1)_{B-L} model. In this model, the lightest neutalino can be the B-L gaugino
widetilde {Z}_{B-L} or the extra Higgsinos widetilde{chi}_{1,2} dominated. We
compute the thermal relic abundance of these particles and show that, unlike
the LSP in MSSM, they can account for the observed relic abundance with no
conflict with other phenomenological constraints. The prospects for their
direct detection, if they are part of our galactic halo, are also discussed.
| [
{
"created": "Sat, 25 Oct 2008 15:09:19 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Jan 2009 12:43:53 GMT",
"version": "v2"
},
{
"created": "Sat, 18 Apr 2009 17:47:00 GMT",
"version": "v3"
}
] | 2010-04-21 | [
[
"Khalil",
"S.",
""
],
[
"Okada",
"H.",
""
]
] | We analyze the dark matter problem in the context of supersymmetric U(1)_{B-L} model. In this model, the lightest neutalino can be the B-L gaugino widetilde {Z}_{B-L} or the extra Higgsinos widetilde{chi}_{1,2} dominated. We compute the thermal relic abundance of these particles and show that, unlike the LSP in MSSM, they can account for the observed relic abundance with no conflict with other phenomenological constraints. The prospects for their direct detection, if they are part of our galactic halo, are also discussed. |
1105.0541 | Dong Phung Van | P. V. Dong | A possible minimal gauge-Higgs unification | 20 pages, revised version | Eur. Phys. J. C 71, 1731 (2011) | 10.1140/epjc/s10052-011-1731-1 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A possible minimal model of the gauge-Higgs unification based on the higher
dimensional spacetime M^4 X (S^1/Z_2) and the bulk gauge symmetry SU(3)_C X
SU(3)_W X U(1)_X is constructed in some details. We argue that the Weinberg
angle and the electromagnetic current can be correctly identified if one
introduces the extra U(1)_X above and a bulk scalar triplet. The VEV of this
scalar as well as the orbifold boundary conditions will break the bulk gauge
symmetry down to that of the standard model. A new neutral zero-mode gauge
boson Z' exists that gains mass via this VEV. We propose a simple fermion
content that is free from all the anomalies when the extra brane-localized
chiral fermions are taken into account as well. The issues on recovering a
standard model chiral-fermion spectrum with the masses and flavor mixing are
also discussed, where we need to introduce the two other brane scalars which
also contribute to the Z' mass in the similar way as the scalar triplet. The
neutrinos can get small masses via a type I seesaw mechanism. In this model,
the mass of the Z' boson and the compactification scale are very constrained as
respectively given in the ranges: 2.7 TeV < m_Z' < 13.6 TeV and 40 TeV < 1/R <
200 TeV.
| [
{
"created": "Tue, 3 May 2011 10:47:29 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Jul 2011 10:14:52 GMT",
"version": "v2"
}
] | 2011-09-01 | [
[
"Dong",
"P. V.",
""
]
] | A possible minimal model of the gauge-Higgs unification based on the higher dimensional spacetime M^4 X (S^1/Z_2) and the bulk gauge symmetry SU(3)_C X SU(3)_W X U(1)_X is constructed in some details. We argue that the Weinberg angle and the electromagnetic current can be correctly identified if one introduces the extra U(1)_X above and a bulk scalar triplet. The VEV of this scalar as well as the orbifold boundary conditions will break the bulk gauge symmetry down to that of the standard model. A new neutral zero-mode gauge boson Z' exists that gains mass via this VEV. We propose a simple fermion content that is free from all the anomalies when the extra brane-localized chiral fermions are taken into account as well. The issues on recovering a standard model chiral-fermion spectrum with the masses and flavor mixing are also discussed, where we need to introduce the two other brane scalars which also contribute to the Z' mass in the similar way as the scalar triplet. The neutrinos can get small masses via a type I seesaw mechanism. In this model, the mass of the Z' boson and the compactification scale are very constrained as respectively given in the ranges: 2.7 TeV < m_Z' < 13.6 TeV and 40 TeV < 1/R < 200 TeV. |
0902.0006 | Yang Bai | Yang Bai and Zhenyu Han | Measuring the Dark Force at the LHC | 4 pages, 4 figures; final version for PRL | Phys.Rev.Lett.103:051801,2009 | 10.1103/PhysRevLett.103.051801 | FERMILAB-PUB-09-026-T | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A long-range ``dark force'' has recently been proposed to mediate the dark
matter (DM) annihilation. If DM particles are copiously produced at the Large
Hadron Collider (LHC), the light dark force mediator will also be produced
through radiation. We demonstrate how and how precise we can utilize this fact
to measure the coupling constant of the dark force. The light mediator's mass
is measured from the ``lepton jet'' it decays to. In addition, the mass of the
DM particle is determined using the MT2 technique. Knowing these quantities is
critical for calculating the DM relic density.
| [
{
"created": "Mon, 2 Feb 2009 17:48:33 GMT",
"version": "v1"
},
{
"created": "Sat, 1 Aug 2009 06:08:07 GMT",
"version": "v2"
}
] | 2009-08-13 | [
[
"Bai",
"Yang",
""
],
[
"Han",
"Zhenyu",
""
]
] | A long-range ``dark force'' has recently been proposed to mediate the dark matter (DM) annihilation. If DM particles are copiously produced at the Large Hadron Collider (LHC), the light dark force mediator will also be produced through radiation. We demonstrate how and how precise we can utilize this fact to measure the coupling constant of the dark force. The light mediator's mass is measured from the ``lepton jet'' it decays to. In addition, the mass of the DM particle is determined using the MT2 technique. Knowing these quantities is critical for calculating the DM relic density. |
1301.7626 | Pablo Roig | Pablo Roig | Hadronic and radiative decays of the tau lepton | PhD Thesis. Universitat de Val\`encia, November 2010. PhD Advisor: J.
Portol\'es | Universitat de Val\`encia, Servei de Publicacions, Dip\`osit
legal: V-3364-2011, I.S.B.N.: 978-84-370-7994-3 | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This PhD thesis studies some hadronic and radiative decays of the tau lepton
using a Chiral Lagrangian including resonance fields. After a theoretical
introduction, the decays to the $(\pi \pi \pi)^-$, $(KK\pi)^-$ and
$\eta^{(\prime)} \pi^- \pi^0$ hadronic states and $\tau \to (\pi/K)^- \gamma
\nu_tau$ are analysed. Some material, which was not included in the
corresponding references, is also discussed: The structure functions analysis
for the 3 pion modes, the differential decay width as a function of the
two-particle invariant masses in the considered three-meson modes and a
simplified study of the $\tau\to$\eta^{(\prime)} \pi^- \pi^0 \nu_tau$ processes
within a single-angle mixing scheme for the $\eta$ and $\eta^\prime$ mesons.
| [
{
"created": "Thu, 31 Jan 2013 14:36:10 GMT",
"version": "v1"
}
] | 2013-02-01 | [
[
"Roig",
"Pablo",
""
]
] | This PhD thesis studies some hadronic and radiative decays of the tau lepton using a Chiral Lagrangian including resonance fields. After a theoretical introduction, the decays to the $(\pi \pi \pi)^-$, $(KK\pi)^-$ and $\eta^{(\prime)} \pi^- \pi^0$ hadronic states and $\tau \to (\pi/K)^- \gamma \nu_tau$ are analysed. Some material, which was not included in the corresponding references, is also discussed: The structure functions analysis for the 3 pion modes, the differential decay width as a function of the two-particle invariant masses in the considered three-meson modes and a simplified study of the $\tau\to$\eta^{(\prime)} \pi^- \pi^0 \nu_tau$ processes within a single-angle mixing scheme for the $\eta$ and $\eta^\prime$ mesons. |
1201.0656 | Alejandro Cabo | Alejandro Cabo Montes de Oca | A proposal of a local modified QCD | 22 pages, 3 figures | null | null | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A local and renormalizable version of a modified PQCD introduced in previous
works is presented. The construction indicates that it could be equivalent to
massless QCD. The case in which only quark condensate effects are retained is
discussed in more detail. Then, the appearing auxiliary fermion fields can be
integrated leading to a theory with the action of massless QCD, to which one
local and gauge invariant Lagrangian term for each quark flavour is added.
These terms are defined by two gluon and two quark fields, in a form curiously
not harming power counting renormalizability. The gluon self-energy is
evaluated in second order in the gauge coupling and all orders in the new quark
couplings, and the result became transversal as required by the gauge
invariance. The vacuum energy was calculated in the two loop approximation and
also became gauge parameter independent. The possibilities that higher loop
contributions to the vacuum energy allow the generation of a quark mass
hierarchy as a flavour symmetry breaking effect are discussed. However, the
decision on this issue needs the evaluation of more than two loop
contributions, in which more than one type of quark loops start appearing,
possibly leading to interference effects in the vacuum energy.
| [
{
"created": "Tue, 3 Jan 2012 15:07:09 GMT",
"version": "v1"
}
] | 2012-01-16 | [
[
"de Oca",
"Alejandro Cabo Montes",
""
]
] | A local and renormalizable version of a modified PQCD introduced in previous works is presented. The construction indicates that it could be equivalent to massless QCD. The case in which only quark condensate effects are retained is discussed in more detail. Then, the appearing auxiliary fermion fields can be integrated leading to a theory with the action of massless QCD, to which one local and gauge invariant Lagrangian term for each quark flavour is added. These terms are defined by two gluon and two quark fields, in a form curiously not harming power counting renormalizability. The gluon self-energy is evaluated in second order in the gauge coupling and all orders in the new quark couplings, and the result became transversal as required by the gauge invariance. The vacuum energy was calculated in the two loop approximation and also became gauge parameter independent. The possibilities that higher loop contributions to the vacuum energy allow the generation of a quark mass hierarchy as a flavour symmetry breaking effect are discussed. However, the decision on this issue needs the evaluation of more than two loop contributions, in which more than one type of quark loops start appearing, possibly leading to interference effects in the vacuum energy. |
2109.07093 | Disha Bhatia | Disha Bhatia, Nishita Desai and Amol Dighe | Frugal $U(1)_X$ models with non-minimal flavor violation for $b \to s
\ell \ell$ anomalies and neutrino mixing | 26 pages, 6 figures | null | 10.1007/JHEP04(2022)163 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the class of models with an extra $U(1)_X$ gauge symmetry that can
account for the $b \to s \ell \ell$ anomalies by modifying the Wilson
coefficients $C_{9e}$ and $C_{9\mu}$ from their standard model values. At the
same time, these models generate appropriate quark mixing, and give rise to
neutrino mixing via the Type-I seesaw mechanism. Apart from the gauge boson
$Z'$, these frugal models only have three right-handed neutrinos for the seesaw
mechanism, an additional $SU(2)_L$ scalar doublet for quark mixing, and a
SM-singlet scalar that breaks the $U(1)_X$ symmetry. This set-up identifies a
class of leptonic symmetries, and necessitates non-zero but equal charges for
the first two quark generations. If the quark mixing beyond the standard model
were CKM-like, all these symmetries would be ruled out by the latest flavor
constraints on Wilson coefficients and collider constraints on $Z'$ parameters.
However, we identify a single-parameter source of non-minimal flavor violation
that allows a wider class of $U(1)_X$ symmetries to be compatible with all
data. We show that the viable leptonic symmetries have to be of the form $L_e
\pm 3 L_\mu - L_\tau$ or $L_e - 3 L_\mu + L_\tau$, and determine the
$(M_{Z^\prime}, g_{Z^\prime})$ parameter space that may be probed by the
high-luminosity data at the LHC.
| [
{
"created": "Wed, 15 Sep 2021 05:47:16 GMT",
"version": "v1"
}
] | 2022-05-18 | [
[
"Bhatia",
"Disha",
""
],
[
"Desai",
"Nishita",
""
],
[
"Dighe",
"Amol",
""
]
] | We analyze the class of models with an extra $U(1)_X$ gauge symmetry that can account for the $b \to s \ell \ell$ anomalies by modifying the Wilson coefficients $C_{9e}$ and $C_{9\mu}$ from their standard model values. At the same time, these models generate appropriate quark mixing, and give rise to neutrino mixing via the Type-I seesaw mechanism. Apart from the gauge boson $Z'$, these frugal models only have three right-handed neutrinos for the seesaw mechanism, an additional $SU(2)_L$ scalar doublet for quark mixing, and a SM-singlet scalar that breaks the $U(1)_X$ symmetry. This set-up identifies a class of leptonic symmetries, and necessitates non-zero but equal charges for the first two quark generations. If the quark mixing beyond the standard model were CKM-like, all these symmetries would be ruled out by the latest flavor constraints on Wilson coefficients and collider constraints on $Z'$ parameters. However, we identify a single-parameter source of non-minimal flavor violation that allows a wider class of $U(1)_X$ symmetries to be compatible with all data. We show that the viable leptonic symmetries have to be of the form $L_e \pm 3 L_\mu - L_\tau$ or $L_e - 3 L_\mu + L_\tau$, and determine the $(M_{Z^\prime}, g_{Z^\prime})$ parameter space that may be probed by the high-luminosity data at the LHC. |
1808.07869 | Jonathan Rosner | Marek Karliner and Jonathan L. Rosner | Scaling of P-wave excitation energies in heavy-quark systems | 10 pages, 1 figure, discussion of B_s added, to be submitted to Phys.
Rev. D. Third paragraph of last section modified | Phys. Rev. D 98, 074026 (2018) | 10.1103/PhysRevD.98.074026 | EFI 18-11, TAUP 3033/18 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A simple regularity in anticipating P-wave excitation energies of states with
heavy quarks is noted. It can apply to systems such as the negative-parity
$\Sigma_c$, $\Sigma_b$, and $\Omega_c$, $\bar Q Q$ quarkonia, and the
bottom-charmed meson $B_c$. When one subtracts a term accounting for
phenomenological energies of heavy quarks binding with one another in S-waves,
the residual excitation energies display an approximately linear behavior in
the reduced mass of constituents, all the way from the $\Lambda$ to the
$\Upsilon$.
| [
{
"created": "Thu, 23 Aug 2018 17:58:49 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Aug 2018 16:13:12 GMT",
"version": "v2"
},
{
"created": "Wed, 3 Oct 2018 22:24:03 GMT",
"version": "v3"
}
] | 2018-10-31 | [
[
"Karliner",
"Marek",
""
],
[
"Rosner",
"Jonathan L.",
""
]
] | A simple regularity in anticipating P-wave excitation energies of states with heavy quarks is noted. It can apply to systems such as the negative-parity $\Sigma_c$, $\Sigma_b$, and $\Omega_c$, $\bar Q Q$ quarkonia, and the bottom-charmed meson $B_c$. When one subtracts a term accounting for phenomenological energies of heavy quarks binding with one another in S-waves, the residual excitation energies display an approximately linear behavior in the reduced mass of constituents, all the way from the $\Lambda$ to the $\Upsilon$. |
2311.12694 | Yong Xu | Nicol\'as Bernal, Simon Cl\'ery, Yann Mambrini, Yong Xu | Probing Reheating with Graviton Bremsstrahlung | V1:24 pages, 6 figures; V2: references updated, minor modifications
with a footnote 9, version accepted for publication in JCAP | null | null | MITP-23-065 | hep-ph astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | We investigate the stochastic gravitational wave (GW) spectrum resulting from
graviton bremsstrahlung during inflationary reheating. We focus on an inflaton
$\phi$ oscillating around a generic monomial potential $V(\phi) \propto
\phi^n$, considering two different reheating scenarios: $i)$ inflaton decay and
$ii)$ inflaton annihilation. We show that in the case of a quadratic potential,
the scattering of the inflatons can give rise to larger GW amplitude than the
decay channel. On the other hand, the GW spectrum exhibits distinct features
and redshifts in each scenario, which makes it possible to distinguish them in
the event of a discovery. Specifically, in the case of annihilation, the GW
frequency can be shifted to values higher than those of decay, whereas the GW
amplitude generated by annihilation turns out to be smaller than that in the
decay case for $n \geq 4$, due to the different scaling of radiation during
reheating. We also show that the differences in the GW spectrum become more
prominent with increasing $n$. Finally, we highlight the potential of future
high-frequency GW detectors to distinguish between the different reheating
scenarios.
| [
{
"created": "Tue, 21 Nov 2023 15:57:59 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Jan 2024 14:27:43 GMT",
"version": "v2"
}
] | 2024-01-10 | [
[
"Bernal",
"Nicolás",
""
],
[
"Cléry",
"Simon",
""
],
[
"Mambrini",
"Yann",
""
],
[
"Xu",
"Yong",
""
]
] | We investigate the stochastic gravitational wave (GW) spectrum resulting from graviton bremsstrahlung during inflationary reheating. We focus on an inflaton $\phi$ oscillating around a generic monomial potential $V(\phi) \propto \phi^n$, considering two different reheating scenarios: $i)$ inflaton decay and $ii)$ inflaton annihilation. We show that in the case of a quadratic potential, the scattering of the inflatons can give rise to larger GW amplitude than the decay channel. On the other hand, the GW spectrum exhibits distinct features and redshifts in each scenario, which makes it possible to distinguish them in the event of a discovery. Specifically, in the case of annihilation, the GW frequency can be shifted to values higher than those of decay, whereas the GW amplitude generated by annihilation turns out to be smaller than that in the decay case for $n \geq 4$, due to the different scaling of radiation during reheating. We also show that the differences in the GW spectrum become more prominent with increasing $n$. Finally, we highlight the potential of future high-frequency GW detectors to distinguish between the different reheating scenarios. |
1403.3797 | Hongshi Zong | Chao Shi, Yong-Long Wang, Yu Jiang, Zhu-Fang Cui, and Hong-Shi Zong | Locate QCD Critical End Point in a Continuum Model Study | 9 pages, 7 figures; Version published in JHEP | JHEP 07 (2014) 014 | 10.1007/JHEP07(2014)014 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | With a modified chemical potential dependent effective model for the gluon
propagator, we try to locate the critical end point (CEP) of strongly
interacting matter in the framework of Dyson-Schwinger equations (DSE). Beyond
the chiral limit, we find that Nambu solution and Wigner solution could coexist
in some area. Using the CornwallJackiw-Tomboulis (CJT) effective action, we
show that these two phases are connected by a first order phase transition. We
then locate CEP as the end point of the first order phase transition line.
Meanwhile, based on CJT effective action, we give a direct calculation for the
chiral susceptibility and thereby study the crossover.
| [
{
"created": "Sat, 15 Mar 2014 12:42:52 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Jul 2014 03:22:12 GMT",
"version": "v2"
}
] | 2014-07-04 | [
[
"Shi",
"Chao",
""
],
[
"Wang",
"Yong-Long",
""
],
[
"Jiang",
"Yu",
""
],
[
"Cui",
"Zhu-Fang",
""
],
[
"Zong",
"Hong-Shi",
""
]
] | With a modified chemical potential dependent effective model for the gluon propagator, we try to locate the critical end point (CEP) of strongly interacting matter in the framework of Dyson-Schwinger equations (DSE). Beyond the chiral limit, we find that Nambu solution and Wigner solution could coexist in some area. Using the CornwallJackiw-Tomboulis (CJT) effective action, we show that these two phases are connected by a first order phase transition. We then locate CEP as the end point of the first order phase transition line. Meanwhile, based on CJT effective action, we give a direct calculation for the chiral susceptibility and thereby study the crossover. |
1408.2264 | Susan Gardner | S. Gardner and E. Jafari | Phenomenology of $n$-${\bar n}$ Oscillations Revisited | 15 pages, REVTeX; revised and rewritten to focus on SM spin-dependent
effects, conclusions persist | Phys. Rev. D 91, 096010 (2015) | 10.1103/PhysRevD.91.096010 | null | hep-ph nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We revisit the phenomenology of $n$-${\bar n}$ oscillations in the presence
of external magnetic fields, highlighting the role of spin. We show, contrary
to long-held belief, that the $n$-${\bar n}$ transition rate need not be
suppressed, opening new opportunities for its empirical study.
| [
{
"created": "Sun, 10 Aug 2014 19:12:25 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Feb 2015 03:19:31 GMT",
"version": "v2"
}
] | 2015-05-27 | [
[
"Gardner",
"S.",
""
],
[
"Jafari",
"E.",
""
]
] | We revisit the phenomenology of $n$-${\bar n}$ oscillations in the presence of external magnetic fields, highlighting the role of spin. We show, contrary to long-held belief, that the $n$-${\bar n}$ transition rate need not be suppressed, opening new opportunities for its empirical study. |
2405.00151 | A. M. Fedotov | A.V. Berezin and A.M. Fedotov | An analytical formula for signal optimization in stimulated
photon-photon scattering setup with three laser pulses | 14 pages, 9 figures | Phys. Rev. D 110, 016009 (2024) | 10.1103/PhysRevD.110.016009 | null | hep-ph physics.optics | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a setup to detect stimulated photon-photon scattering using
high-power lasers. Signal photons are emitted from an overlap of the incoming
intense laser pulses focused in vacuum from three sides. We derive and justify
a general approximate analytical formula for the angular distribution and total
yield of such signal photons in terms of the parameters of the incoming pulses,
including their intensity, carrier frequencies, durations, focusing,
polarizations, mutual orientation and overlap. Using the obtained formula a
parametric study of the signal is carried out and optimization is performed.
| [
{
"created": "Tue, 30 Apr 2024 18:58:46 GMT",
"version": "v1"
}
] | 2024-08-15 | [
[
"Berezin",
"A. V.",
""
],
[
"Fedotov",
"A. M.",
""
]
] | We consider a setup to detect stimulated photon-photon scattering using high-power lasers. Signal photons are emitted from an overlap of the incoming intense laser pulses focused in vacuum from three sides. We derive and justify a general approximate analytical formula for the angular distribution and total yield of such signal photons in terms of the parameters of the incoming pulses, including their intensity, carrier frequencies, durations, focusing, polarizations, mutual orientation and overlap. Using the obtained formula a parametric study of the signal is carried out and optimization is performed. |
1812.00385 | Philipp Gubler | Philipp Gubler, Daisuke Satow | Recent Progress in QCD Condensate Evaluations and Sum Rules | 106 pages, 25 figures, 7 tables, matches published version in
Progress in Particle and Nuclear Physics, 2019 | Prog. Part. Nucl. Phys. 106, 1 (2019) | 10.1016/j.ppnp.2019.02.005 | null | hep-ph hep-ex hep-lat nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review the recent status of the QCD sum rule approach to study the
properties of hadrons in vacuum and in hot or dense matter. Special focus is
laid on the progress made in the evaluation of the QCD condensates, which are
the input of all QCD sum rule calculations, and for which much new information
has become available through high precision lattice QCD calculations, chiral
perturbation theory and experimental measurements. Furthermore, we critically
examine common analysis methods for QCD sum rules and contrast them with
potential alternative strategies. The status of QCD sum rule studies
investigating the modification of hadrons at finite density as well as recent
derivations of exact sum rules applicable to finite temperature spectral
functions, are also reviewed.
| [
{
"created": "Sun, 2 Dec 2018 13:04:20 GMT",
"version": "v1"
},
{
"created": "Sat, 6 Apr 2019 02:03:49 GMT",
"version": "v2"
}
] | 2019-04-09 | [
[
"Gubler",
"Philipp",
""
],
[
"Satow",
"Daisuke",
""
]
] | We review the recent status of the QCD sum rule approach to study the properties of hadrons in vacuum and in hot or dense matter. Special focus is laid on the progress made in the evaluation of the QCD condensates, which are the input of all QCD sum rule calculations, and for which much new information has become available through high precision lattice QCD calculations, chiral perturbation theory and experimental measurements. Furthermore, we critically examine common analysis methods for QCD sum rules and contrast them with potential alternative strategies. The status of QCD sum rule studies investigating the modification of hadrons at finite density as well as recent derivations of exact sum rules applicable to finite temperature spectral functions, are also reviewed. |
1301.1603 | Clare Burrage | Clare Burrage | Shining Light on Dark Energy and Modifications of Gravity | 4 pages, 1 figure. Contributed to the 8th Patras Workshop on Axions,
WIMPs and WISPs, Chicago, July 18-22, 2012 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Many theories of dark energy and modified gravity give rise to scalar fields
that couple derivatively to the energy momentum tensor of matter. This is known
as disformal coupling. I will show that laboratory searches for axions are
ideally suited to search for and constrain disformal scalar fields.
| [
{
"created": "Tue, 8 Jan 2013 17:29:39 GMT",
"version": "v1"
}
] | 2013-01-09 | [
[
"Burrage",
"Clare",
""
]
] | Many theories of dark energy and modified gravity give rise to scalar fields that couple derivatively to the energy momentum tensor of matter. This is known as disformal coupling. I will show that laboratory searches for axions are ideally suited to search for and constrain disformal scalar fields. |
1709.07670 | Julian Heeck | Julian Heeck | Phenomenology of Majorons | 4 pages. Contributed to the 13th Patras Workshop on Axions, WIMPs and
WISPs, Thessaloniki, May 15 to 19, 2017 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Majorons are the Goldstone bosons associated to lepton number and thus
closely connected to Majorana neutrino masses. Couplings to charged fermions
arise at one-loop level, including lepton-flavor-violating ones that lead to
decays $\ell\to \ell' J$, whereas a coupling to photons is generated at two
loops. The typically small couplings make massive majorons a prime candidate
for long-lived dark matter. Its signature decay into two mono-energetic
neutrinos is potentially detectable for majoron masses above MeV.
| [
{
"created": "Fri, 22 Sep 2017 10:06:37 GMT",
"version": "v1"
}
] | 2017-09-25 | [
[
"Heeck",
"Julian",
""
]
] | Majorons are the Goldstone bosons associated to lepton number and thus closely connected to Majorana neutrino masses. Couplings to charged fermions arise at one-loop level, including lepton-flavor-violating ones that lead to decays $\ell\to \ell' J$, whereas a coupling to photons is generated at two loops. The typically small couplings make massive majorons a prime candidate for long-lived dark matter. Its signature decay into two mono-energetic neutrinos is potentially detectable for majoron masses above MeV. |
1602.01057 | Ibrahim Akal | Ibrahim Akal, Gudrid Moortgat-Pick | Nonlinear lepton-photon interactions in external background fields | 39 pages, 8 figures, minor changes in introduction, references added,
a few misprints found | null | null | DESY 15-180 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Nonlinear phenomena of lepton-photon interactions in external backgrounds
with a generalised periodic plane-wave geometry are studied. We discuss
nonlinear Compton scattering in head-on lepton-photon collisions extended
properly to beyond the soft-photon regime. In addition, our results are applied
to stimulated lepton-antilepton pair production in photon collisions with
unrestricted energies. Derivations are considered semi-classically based on
unperturbed fermionic Volkov representations encoding the full interaction with
the background field. Closed expressions for total probabilities considering
S-matrix elements have been derived. The general formula is applied to Compton
scattering by an electron propagating in an external laser-like background. We
obtain additive contributions in the extended unconstrained result which turns
out to be stringently required in the highly nonlinear regime. A detailed
comparison of contributing harmonics is discussed for various field parameters.
| [
{
"created": "Tue, 2 Feb 2016 19:40:13 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Feb 2016 20:20:43 GMT",
"version": "v2"
}
] | 2016-02-09 | [
[
"Akal",
"Ibrahim",
""
],
[
"Moortgat-Pick",
"Gudrid",
""
]
] | Nonlinear phenomena of lepton-photon interactions in external backgrounds with a generalised periodic plane-wave geometry are studied. We discuss nonlinear Compton scattering in head-on lepton-photon collisions extended properly to beyond the soft-photon regime. In addition, our results are applied to stimulated lepton-antilepton pair production in photon collisions with unrestricted energies. Derivations are considered semi-classically based on unperturbed fermionic Volkov representations encoding the full interaction with the background field. Closed expressions for total probabilities considering S-matrix elements have been derived. The general formula is applied to Compton scattering by an electron propagating in an external laser-like background. We obtain additive contributions in the extended unconstrained result which turns out to be stringently required in the highly nonlinear regime. A detailed comparison of contributing harmonics is discussed for various field parameters. |
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