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/0703303 | Teruyuki Kitabayashi | Teruyuki Kitabayashi | Remark on the minimal seesaw model and leptogenesis with tri/bi-maximal
mixing | 9 pages, 7 figures, uses RevTex4. To appear in Physcal Review D | Phys.Rev.D76:033002,2007 | 10.1103/PhysRevD.76.033002 | null | hep-ph | null | We have studied a leptogenesis scenario in the framework of the minimal
seesaw model with tri/bi-maximal mixing. Usually, at least one of the elements
in the Dirac mass matrix is fixed to be zero, for example, we denote it by
$b_2=0$. We have pointed out that the absolute value of the CP asymmetry has
several minimums and maximums with non-zero $b_2$. Thus one can expect that
more rich phenomena, such as an enhanced leptogenesis, are hidden in the $b_2
\neq 0$ space.
| [
{
"created": "Thu, 29 Mar 2007 05:11:57 GMT",
"version": "v1"
},
{
"created": "Thu, 12 Jul 2007 07:04:52 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Kitabayashi",
"Teruyuki",
""
]
] | We have studied a leptogenesis scenario in the framework of the minimal seesaw model with tri/bi-maximal mixing. Usually, at least one of the elements in the Dirac mass matrix is fixed to be zero, for example, we denote it by $b_2=0$. We have pointed out that the absolute value of the CP asymmetry has several minimums and maximums with non-zero $b_2$. Thus one can expect that more rich phenomena, such as an enhanced leptogenesis, are hidden in the $b_2 \neq 0$ space. |
1310.7545 | Elmar Biernat P | Elmar P. Biernat, Franz Gross, M. T. Pe\~na, Alfred Stadler | Confinement, quark mass functions, and spontaneous chiral symmetry
breaking in Minkowski space | 17 pages, 12 figures, version published in Phys. Rev. D | Phys. Rev. D 89, 016005 (2014) | 10.1103/PhysRevD.89.016005 | JLAB-THY-13-1814, CFTP/13-026 | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We formulate the covariant equations for quark-antiquark bound states in
Minkowski space in the framework of the Covariant Spectator Theory. The quark
propagators are dressed with the same kernel that describes the interaction
between different quarks. We show that these equations are charge-conjugation
invariant, and that in the chiral limit of vanishing bare quark mass, a
massless pseudoscalar bound state is produced in a Nambu-Jona-Lasinio (NJL)
mechanism, which is associated with the Goldstone boson of spontaneous chiral
symmetry breaking. In this introductory paper, we test the formalism by using a
simplified kernel consisting of a momentum-space delta-function with a vector
Lorentz structure, to which one adds a mixed scalar and vector confining
interaction. The scalar part of the confining interaction is not chirally
invariant by itself, but decouples from the equations in the chiral limit and
therefore allows the NJL mechanism to work. With this model we calculate the
quark mass function, and we compare our Minkowski-space results to lattice QCD
data obtained in Euclidean space. In a companion paper, we apply this formalism
to a calculation of the pion form factor.
| [
{
"created": "Mon, 28 Oct 2013 19:27:23 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Oct 2013 16:16:11 GMT",
"version": "v2"
},
{
"created": "Wed, 8 Jan 2014 14:38:55 GMT",
"version": "v3"
}
] | 2014-01-09 | [
[
"Biernat",
"Elmar P.",
""
],
[
"Gross",
"Franz",
""
],
[
"Peña",
"M. T.",
""
],
[
"Stadler",
"Alfred",
""
]
] | We formulate the covariant equations for quark-antiquark bound states in Minkowski space in the framework of the Covariant Spectator Theory. The quark propagators are dressed with the same kernel that describes the interaction between different quarks. We show that these equations are charge-conjugation invariant, and that in the chiral limit of vanishing bare quark mass, a massless pseudoscalar bound state is produced in a Nambu-Jona-Lasinio (NJL) mechanism, which is associated with the Goldstone boson of spontaneous chiral symmetry breaking. In this introductory paper, we test the formalism by using a simplified kernel consisting of a momentum-space delta-function with a vector Lorentz structure, to which one adds a mixed scalar and vector confining interaction. The scalar part of the confining interaction is not chirally invariant by itself, but decouples from the equations in the chiral limit and therefore allows the NJL mechanism to work. With this model we calculate the quark mass function, and we compare our Minkowski-space results to lattice QCD data obtained in Euclidean space. In a companion paper, we apply this formalism to a calculation of the pion form factor. |
hep-ph/0305306 | John McDonald | John McDonald | Flat Direction Dynamics in a Non-Topological Soliton-Dominated Universe | 16 pages LaTeX, additional discussion, conclusions unchanged | JCAP0408:002,2004 | 10.1088/1475-7516/2004/08/002 | null | hep-ph | null | In hybrid inflation and running mass inflation models it is possible that the
inflaton field will fragment into non-topological solitons, resulting in a
highly inhomogeneous post-inflation era prior to reheating. In supersymmetric
models with a conventional homogeneous post-inflation era, the dynamics of flat
direction scalars are determined by cH^{2} corrections to the mass squared
terms, coming from the energy density of the Universe combined with
Planck-scale suppressed interactions. Here we reconsider the cH^{2} corrections
for a Universe dominated by inflatonic non-topological solitons. We show that
the dynamics in this case are typically equivalent to the case c = 0, even in
the vicinity of the non-topological solitons. Thus Affleck-Dine baryogenesis
will proceed as in the original c = 0 Affleck-Dine scenario.
| [
{
"created": "Wed, 28 May 2003 07:44:07 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Jun 2004 11:30:43 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"McDonald",
"John",
""
]
] | In hybrid inflation and running mass inflation models it is possible that the inflaton field will fragment into non-topological solitons, resulting in a highly inhomogeneous post-inflation era prior to reheating. In supersymmetric models with a conventional homogeneous post-inflation era, the dynamics of flat direction scalars are determined by cH^{2} corrections to the mass squared terms, coming from the energy density of the Universe combined with Planck-scale suppressed interactions. Here we reconsider the cH^{2} corrections for a Universe dominated by inflatonic non-topological solitons. We show that the dynamics in this case are typically equivalent to the case c = 0, even in the vicinity of the non-topological solitons. Thus Affleck-Dine baryogenesis will proceed as in the original c = 0 Affleck-Dine scenario. |
1601.02092 | Xiang Liu | Hua-Xing Chen, Wei Chen, Xiang Liu and Shi-Lin Zhu | The hidden-charm pentaquark and tetraquark states | Review accepted by Physics Reports, 152 pages, 66 figures, and 29
tables | Physics Reports 639, 1-121 (2016) | 10.1016/j.physrep.2016.05.004 | null | hep-ph hep-ex hep-lat nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the past decade many charmonium-like states were observed experimentally.
Especially those charged charmonium-like $Z_c$ states and bottomonium-like
$Z_b$ states can not be accommodated within the naive quark model. These
charged $Z_c$ states are good candidates of either the hidden-charm tetraquark
states or molecules composed of a pair of charmed mesons. Recently, the LHCb
Collaboration discovered two hidden-charm pentaquark states, which are also
beyond the quark model. In this work, we review the current experimental
progress and investigate various theoretical interpretations of these
candidates of the multiquark states. We list the puzzles and theoretical
challenges of these models when confronted with the experimental data. We also
discuss possible future measurements which may distinguish the theoretical
schemes on the underlying structures of the hidden-charm multiquark states.
| [
{
"created": "Sat, 9 Jan 2016 10:42:30 GMT",
"version": "v1"
},
{
"created": "Sat, 23 Jan 2016 02:16:12 GMT",
"version": "v2"
},
{
"created": "Sun, 22 May 2016 08:08:27 GMT",
"version": "v3"
}
] | 2016-06-20 | [
[
"Chen",
"Hua-Xing",
""
],
[
"Chen",
"Wei",
""
],
[
"Liu",
"Xiang",
""
],
[
"Zhu",
"Shi-Lin",
""
]
] | In the past decade many charmonium-like states were observed experimentally. Especially those charged charmonium-like $Z_c$ states and bottomonium-like $Z_b$ states can not be accommodated within the naive quark model. These charged $Z_c$ states are good candidates of either the hidden-charm tetraquark states or molecules composed of a pair of charmed mesons. Recently, the LHCb Collaboration discovered two hidden-charm pentaquark states, which are also beyond the quark model. In this work, we review the current experimental progress and investigate various theoretical interpretations of these candidates of the multiquark states. We list the puzzles and theoretical challenges of these models when confronted with the experimental data. We also discuss possible future measurements which may distinguish the theoretical schemes on the underlying structures of the hidden-charm multiquark states. |
1502.02931 | William Klemm | Rikard Enberg, William Klemm, Stefano Moretti, Shoaib Munir, Glenn
Wouda | Search for Charged Higgs bosons via decays to $W^\pm$ and a 125 GeV
Higgs at the Large Hadron Collider | 6 pages, 2 figures; Proceedings of "Prospects for Charged Higgs
Discovery at Colliders (CHARGED 2014)", 16-18 September 2014, Uppsala, Sweden | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The recent observation of a 125 GeV neutral Higgs boson ($H_{\rm obs}$)
provides additional input for charged Higgs boson searches in the $H^\pm \to
W^\pm H_{\rm obs}$ decay channel at the Large Hadron Collider (LHC). We
reassess the discovery potential in this channel, which is important for
$H^\pm$ heavier than the top quark mass. When $H_{\rm obs}$ decays to a
$b\bar{b}$ pair, knowledge of the Higgs mass aids in the kinematic selection of
signal events. We perform a signal-to-background analysis to demonstrate the
LHC prospects for charged Higgs discovery in the resulting channel $pp\to
t(\bar{b})H^-\to \ell^\pm\nu_\ell jj bb\bar{b}(\bar{b})$+h.c. for standard (300
fb$^{-1}$) and high (3000 fb$^{-1}$) luminosities at design energy,
$\sqrt{s}=14 {\rm TeV}$. We find that regions of the parameter space of several
two-Higgs doublet models, consistent with constraints from LHC Higgs searches
and $b$-physics observables, are testable in this channel.
| [
{
"created": "Tue, 10 Feb 2015 15:03:11 GMT",
"version": "v1"
}
] | 2015-02-11 | [
[
"Enberg",
"Rikard",
""
],
[
"Klemm",
"William",
""
],
[
"Moretti",
"Stefano",
""
],
[
"Munir",
"Shoaib",
""
],
[
"Wouda",
"Glenn",
""
]
] | The recent observation of a 125 GeV neutral Higgs boson ($H_{\rm obs}$) provides additional input for charged Higgs boson searches in the $H^\pm \to W^\pm H_{\rm obs}$ decay channel at the Large Hadron Collider (LHC). We reassess the discovery potential in this channel, which is important for $H^\pm$ heavier than the top quark mass. When $H_{\rm obs}$ decays to a $b\bar{b}$ pair, knowledge of the Higgs mass aids in the kinematic selection of signal events. We perform a signal-to-background analysis to demonstrate the LHC prospects for charged Higgs discovery in the resulting channel $pp\to t(\bar{b})H^-\to \ell^\pm\nu_\ell jj bb\bar{b}(\bar{b})$+h.c. for standard (300 fb$^{-1}$) and high (3000 fb$^{-1}$) luminosities at design energy, $\sqrt{s}=14 {\rm TeV}$. We find that regions of the parameter space of several two-Higgs doublet models, consistent with constraints from LHC Higgs searches and $b$-physics observables, are testable in this channel. |
1303.4848 | Xiao-Gang He | Xiao-Gang He, Han Phoon, Yong Tang and German Valencia | Unitarity and vacuum stability constraints on the couplings of color
octet scalars | RevTex 20 pages with 5 figures. Version appears in JHEP | null | 10.1007/JHEP05(2013)026 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The recent discovery of a 126 GeV boson at the LHC will be followed by a
detailed examination of its couplings in order to determine whether this
particle is the Higgs boson of the standard model or one of many particles of
an extended scalar sector. One such extension with a rich phenomenology
consists of a color octet electroweak doublet scalar. The most general
renormalizable scalar potential contains twelve new parameters and it is
therefore desirable to constrain them. We present theoretical constraints on
these parameters obtained by requiring perturbative unitarity for two-to-two
scalar scattering amplitudes at high energy and vacuum stability.
| [
{
"created": "Wed, 20 Mar 2013 06:50:46 GMT",
"version": "v1"
},
{
"created": "Fri, 10 May 2013 05:50:25 GMT",
"version": "v2"
}
] | 2015-06-15 | [
[
"He",
"Xiao-Gang",
""
],
[
"Phoon",
"Han",
""
],
[
"Tang",
"Yong",
""
],
[
"Valencia",
"German",
""
]
] | The recent discovery of a 126 GeV boson at the LHC will be followed by a detailed examination of its couplings in order to determine whether this particle is the Higgs boson of the standard model or one of many particles of an extended scalar sector. One such extension with a rich phenomenology consists of a color octet electroweak doublet scalar. The most general renormalizable scalar potential contains twelve new parameters and it is therefore desirable to constrain them. We present theoretical constraints on these parameters obtained by requiring perturbative unitarity for two-to-two scalar scattering amplitudes at high energy and vacuum stability. |
0711.4748 | Yurii Surovtsev | Yu.S. Surovtsev and P. Bydzovsky | Rho-Like Mesons from Analysis of the Pion-Pion Scattering | LaTex, 2 figures, 12 pages; presented at the XII Int. Conf. on Hadron
Spectroscopy - Hadron07 (8-13 October 2007, Frascati, Italy). Corrected
version | null | null | null | hep-ph | null | Considering analyticity, unitarity and an influence of coupled channels,
experimental data on the isovector P-wave of pion-pion scattering was analyzed
to study rho-like mesons below 1900 MeV. The analysis indicates evidently that
in the energy range 1200--1800 MeV, there are three rho-like mesons: rho(1250),
rho(1450) and rho(1600), unlike the PDG tables. The obtained P-wave pion-pion
scattering length (a_1^1=33.9+- 2.02 [10^{-3}m_{pi^+}^{-3}]) most matches to
the one calculated in the local Nambu--Jona-Lasinio model.
| [
{
"created": "Thu, 29 Nov 2007 15:20:34 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Jun 2008 14:23:11 GMT",
"version": "v2"
}
] | 2008-06-02 | [
[
"Surovtsev",
"Yu. S.",
""
],
[
"Bydzovsky",
"P.",
""
]
] | Considering analyticity, unitarity and an influence of coupled channels, experimental data on the isovector P-wave of pion-pion scattering was analyzed to study rho-like mesons below 1900 MeV. The analysis indicates evidently that in the energy range 1200--1800 MeV, there are three rho-like mesons: rho(1250), rho(1450) and rho(1600), unlike the PDG tables. The obtained P-wave pion-pion scattering length (a_1^1=33.9+- 2.02 [10^{-3}m_{pi^+}^{-3}]) most matches to the one calculated in the local Nambu--Jona-Lasinio model. |
1106.5857 | Ernst Trojan | Ernst Trojan and George V. Vlasov | Tachyonic thermal excitations and causality | 11 pages, 4 figures | null | null | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider an ideal Fermi gas of tachyonic thermal excitations as a
continuous medium and establish when it satisfies the causality condition. At
high temperature the sound speed is always subluminal $c_s<1$, but there is no
stable form of tachyon matter below the critical temperature $T_c<0.23m$ that
depends on the tachyon mass $m$. The pressure $P$ and energy density $E$ cannot
be arbitrary small, but $P$ can exceed $E$, and $P=2.36E$ when $T\rightarrow
T_c$.
| [
{
"created": "Wed, 29 Jun 2011 07:40:37 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Jul 2011 23:15:04 GMT",
"version": "v2"
},
{
"created": "Sat, 8 Oct 2011 12:39:22 GMT",
"version": "v3"
}
] | 2015-03-19 | [
[
"Trojan",
"Ernst",
""
],
[
"Vlasov",
"George V.",
""
]
] | We consider an ideal Fermi gas of tachyonic thermal excitations as a continuous medium and establish when it satisfies the causality condition. At high temperature the sound speed is always subluminal $c_s<1$, but there is no stable form of tachyon matter below the critical temperature $T_c<0.23m$ that depends on the tachyon mass $m$. The pressure $P$ and energy density $E$ cannot be arbitrary small, but $P$ can exceed $E$, and $P=2.36E$ when $T\rightarrow T_c$. |
1909.01656 | Yannick Ulrich | L. Naterop, A. Signer, Y. Ulrich | HandyG -- rapid numerical evaluation of generalised polylogarithms in
Fortran | 24 pages, 3 figures, 2 listings, published version with updated URLs.
Code is available at https://gitlab.com/mule-tools/handyG | Comput.Phys.Commun. 253 (2020) 107165 | 10.1016/j.cpc.2020.107165 | PSI-PR-19-17, ZU-TH 40/19 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Generalised polylogarithms naturally appear in higher-order calculations of
quantum field theories. We present handyG, a Fortran 90 library for the
evaluation of such functions, by implementing the algorithm proposed by
Vollinga and Weinzierl. This allows fast numerical evaluation of generalised
polylogarithms with currently relevant weights, suitable for Monte Carlo
integration.
| [
{
"created": "Wed, 4 Sep 2019 09:41:47 GMT",
"version": "v1"
},
{
"created": "Fri, 3 Jul 2020 10:44:56 GMT",
"version": "v2"
},
{
"created": "Mon, 9 Aug 2021 16:10:19 GMT",
"version": "v3"
}
] | 2021-08-10 | [
[
"Naterop",
"L.",
""
],
[
"Signer",
"A.",
""
],
[
"Ulrich",
"Y.",
""
]
] | Generalised polylogarithms naturally appear in higher-order calculations of quantum field theories. We present handyG, a Fortran 90 library for the evaluation of such functions, by implementing the algorithm proposed by Vollinga and Weinzierl. This allows fast numerical evaluation of generalised polylogarithms with currently relevant weights, suitable for Monte Carlo integration. |
hep-ph/9608449 | null | Christoph Greub, Tobias Hurth | Towards a next-to-leading logarithmic result in $B \to X_s \gamma$ | 5 pages, 1 figure included, uses sprocl.sty and psfig.sty. Submitted
for the DPF96 proceedings | null | null | SLAC-PUB-7267; ITP-SB-96-46 | hep-ph | null | The calculation of the $O(\a_s)$ virtual corrections to the matrix element of
the inclusive decay $b \to s \gamma$ is reported. These contributions
drastically reduce the large renormalization scale dependence of the leading
logarithmic calculation. Combining these results with the preliminary result
for the Wilson coefficient $C_7(m_b)$ calculated recently by Chetyrkin, Misiak,
and M\"unz, we estimate the branching ratio to be $BR(B \to X_s \gamma)=(3.25
\pm 0.50) \times 10^{-4}$.
| [
{
"created": "Tue, 27 Aug 1996 06:22:23 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Greub",
"Christoph",
""
],
[
"Hurth",
"Tobias",
""
]
] | The calculation of the $O(\a_s)$ virtual corrections to the matrix element of the inclusive decay $b \to s \gamma$ is reported. These contributions drastically reduce the large renormalization scale dependence of the leading logarithmic calculation. Combining these results with the preliminary result for the Wilson coefficient $C_7(m_b)$ calculated recently by Chetyrkin, Misiak, and M\"unz, we estimate the branching ratio to be $BR(B \to X_s \gamma)=(3.25 \pm 0.50) \times 10^{-4}$. |
hep-ph/0005289 | Altug Ozpineci | H. Ciftci, H. Koru | Meson decay in an independent quark model | 13 pages | Int.J.Mod.Phys. E9 (2000) 407-416 | 10.1142/S0218301300000180 | null | hep-ph | null | Leptonic decay widths and leptonic decay constants of light vector mesons and
weak leptonic decay widths and weak decay constants of light and heavy
pseudoscalar mesons have been studied in a field- theoretic framework based on
the independent quark model with a scalar- vector power-law potential. The
results are in very good agreement with the experimental data.
| [
{
"created": "Mon, 29 May 2000 18:59:11 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Ciftci",
"H.",
""
],
[
"Koru",
"H.",
""
]
] | Leptonic decay widths and leptonic decay constants of light vector mesons and weak leptonic decay widths and weak decay constants of light and heavy pseudoscalar mesons have been studied in a field- theoretic framework based on the independent quark model with a scalar- vector power-law potential. The results are in very good agreement with the experimental data. |
2305.08160 | Christophe Royon | C. Royon | Physics with intact protons at the LHC: from the odderon discovery to
the sensitivity to beyond standard model physics | This article corresponds to the talk given at the 18th Workshop of
Particles and Fields, Puebla, Mexico, November 21-25 2022 after receiving the
2022 medal of the Mexican Society of Physics, Division of Particles and
Fields | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We describe the discovery of the colorless $C$-odd gluonic compound, the
odderon, by the D0 and TOTEM Collaborations by comparing elastic differential
cross sections measured in $pp$ and $p \bar{p}$ interactions at high energies.
We also discuss the reach on quartic anomalous couplings and the sensitivity to
axion like particle production by using the LHC as a $\gamma \gamma$ collider
and detecting the intact protons at high luminosity.
| [
{
"created": "Sun, 14 May 2023 14:00:23 GMT",
"version": "v1"
}
] | 2023-05-16 | [
[
"Royon",
"C.",
""
]
] | We describe the discovery of the colorless $C$-odd gluonic compound, the odderon, by the D0 and TOTEM Collaborations by comparing elastic differential cross sections measured in $pp$ and $p \bar{p}$ interactions at high energies. We also discuss the reach on quartic anomalous couplings and the sensitivity to axion like particle production by using the LHC as a $\gamma \gamma$ collider and detecting the intact protons at high luminosity. |
1504.05755 | Kristian McDonald | Amine Ahriche, Kristian L. McDonald, Salah Nasri and Takashi Toma | A Model of Neutrino Mass and Dark Matter with an Accidental Symmetry | 9 pages, 3 figures; v2 minor correction to PLB version (results
unchanged) | null | null | LPT-Orsay-15-29 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a model of radiative neutrino mass that automatically contains an
accidental $Z_2$ symmetry and thus provides a stable dark matter candidate.
This allows a common framework for the origin of neutrino mass and dark matter
without invoking any symmetries beyond those of the Standard Model. The model
can be probed by direct-detection experiments and $\mu\rightarrow e+\gamma$
searches, and predicts a charged scalar that can appear at the TeV scale,
within reach of collider experiments.
| [
{
"created": "Wed, 22 Apr 2015 12:27:15 GMT",
"version": "v1"
},
{
"created": "Sun, 8 Nov 2015 08:08:24 GMT",
"version": "v2"
}
] | 2015-11-10 | [
[
"Ahriche",
"Amine",
""
],
[
"McDonald",
"Kristian L.",
""
],
[
"Nasri",
"Salah",
""
],
[
"Toma",
"Takashi",
""
]
] | We present a model of radiative neutrino mass that automatically contains an accidental $Z_2$ symmetry and thus provides a stable dark matter candidate. This allows a common framework for the origin of neutrino mass and dark matter without invoking any symmetries beyond those of the Standard Model. The model can be probed by direct-detection experiments and $\mu\rightarrow e+\gamma$ searches, and predicts a charged scalar that can appear at the TeV scale, within reach of collider experiments. |
2303.08143 | Kyle Devereaux | Kyle Devereaux, Wenqing Fan, Weiyao Ke, Kyle Lee, and Ian Moult | Imaging Cold Nuclear Matter with Energy Correlators | 6 pages, 5 beautiful figures, and appendices | null | null | MIT-CTP 5513, LA-UR-23-22542 | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The future electron-ion collider (EIC) will produce the first-ever high
energy collisions between electrons and a wide range of nuclei, opening a new
era in the study of cold nuclear matter. Quarks and gluons produced in these
collisions will propagate through the dense nuclear matter of nuclei,
imprinting its structure into subtle correlations in the energy flux of final
state hadrons. In this Letter, we apply recent developments from the field of
jet substructure, namely the energy correlator observables, to decode these
correlations and provide a new window into nuclear structure. The energy
correlators provide a calibrated probe of the scale dependence of vacuum QCD
dynamics, enabling medium modifications to be cleanly imaged and interpreted as
a function of scale. Using the eHIJING parton shower to simulate
electron-nucleus collisions, we demonstrate that the size of the nucleus is
cleanly imprinted as an angular scale in the correlators, with a magnitude that
is visible for realistic EIC kinematics. Remarkably, we can even observe the
size difference between the proposed EIC nuclear targets ${}^3$He, ${}^4$He,
${}^{12}$C, ${}^{40}$Ca, ${}^{64}$Cu, ${}^{197}$Au, and ${}^{238}$U, showing
that the energy correlators can image femtometer length scales using asymptotic
energy flux. Our approach offers a unified view of jet substructure across
collider experiments, and provides numerous new theoretical tools to unravel
the complex dynamics of QCD in extreme environments, both hot and cold.
| [
{
"created": "Tue, 14 Mar 2023 18:00:00 GMT",
"version": "v1"
}
] | 2023-03-16 | [
[
"Devereaux",
"Kyle",
""
],
[
"Fan",
"Wenqing",
""
],
[
"Ke",
"Weiyao",
""
],
[
"Lee",
"Kyle",
""
],
[
"Moult",
"Ian",
""
]
] | The future electron-ion collider (EIC) will produce the first-ever high energy collisions between electrons and a wide range of nuclei, opening a new era in the study of cold nuclear matter. Quarks and gluons produced in these collisions will propagate through the dense nuclear matter of nuclei, imprinting its structure into subtle correlations in the energy flux of final state hadrons. In this Letter, we apply recent developments from the field of jet substructure, namely the energy correlator observables, to decode these correlations and provide a new window into nuclear structure. The energy correlators provide a calibrated probe of the scale dependence of vacuum QCD dynamics, enabling medium modifications to be cleanly imaged and interpreted as a function of scale. Using the eHIJING parton shower to simulate electron-nucleus collisions, we demonstrate that the size of the nucleus is cleanly imprinted as an angular scale in the correlators, with a magnitude that is visible for realistic EIC kinematics. Remarkably, we can even observe the size difference between the proposed EIC nuclear targets ${}^3$He, ${}^4$He, ${}^{12}$C, ${}^{40}$Ca, ${}^{64}$Cu, ${}^{197}$Au, and ${}^{238}$U, showing that the energy correlators can image femtometer length scales using asymptotic energy flux. Our approach offers a unified view of jet substructure across collider experiments, and provides numerous new theoretical tools to unravel the complex dynamics of QCD in extreme environments, both hot and cold. |
hep-ph/0302085 | Bruce H. J. McKellar | Kyungsik Kang and Bruce H. J. McKellar | The universal $\ln^{2}s$ increase in total cross sections | 8pp, some minor typographical corrections made | null | null | KIAS-P02043, UM-P-017-2002 | hep-ph | null | While it has long been known that many models of high energy scattering give
cross sections which rise as $\ln^{2}s$, the determination of the coefficient
of this term is rarely given. We show that in gaussian and exponential eikonal
models an exact expression for the cross section can be obtained, which
demonstrates the $\ln^{2}s$ asyptoptic behaviour and determines its
coefficient. The coefficient is universal, as found empirically, and the value
of the constant obtained from the gaussian model is in good agreement with the
empirical value.
| [
{
"created": "Wed, 12 Feb 2003 03:14:09 GMT",
"version": "v1"
},
{
"created": "Mon, 17 Feb 2003 06:53:18 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Kang",
"Kyungsik",
""
],
[
"McKellar",
"Bruce H. J.",
""
]
] | While it has long been known that many models of high energy scattering give cross sections which rise as $\ln^{2}s$, the determination of the coefficient of this term is rarely given. We show that in gaussian and exponential eikonal models an exact expression for the cross section can be obtained, which demonstrates the $\ln^{2}s$ asyptoptic behaviour and determines its coefficient. The coefficient is universal, as found empirically, and the value of the constant obtained from the gaussian model is in good agreement with the empirical value. |
2404.03963 | Takumu Yamanaka | Tomohiro Abe, Ryosuke Sato, Takumu Yamanaka | Composite Dark Matter with Forbidden Annihilation | 30 pages, 11 figures | null | null | OU-HET-1219 | hep-ph astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | A dark matter model based on QCD-like $SU(N_c)$ gauge theory with
electroweakly interacting dark quarks is discussed. Assuming the dark quark
mass $m$ is smaller than the dynamical scale $\Lambda_d \sim 4\pi f_d$, the
main component of the dark matter is the lightest $G$-parity odd dark pion
associated with chiral symmetry breaking in the dark sector. We show that
nonzero dark quark mass induces the universal mass contribution to both
$G$-parity odd and even pions, and their masses tend to be degenerate. As a
result, dark pion annihilation into heavier $G$-parity even dark pion also
affects the dark matter relic abundance. Thus, our setup naturally accommodates
forbidden dark matter scenario and realizes heavy dark matter whose mass is
${\cal O}(1$-$100)~{\rm TeV}$, which is different from conventional
electroweakly interacting dark matter such as minimal dark matter. We also
discuss CP-violation from $\theta$-term in the dark gauge sector and find that
the predicted size of electron electric dipole moment can be as large as $\sim
10^{-32}~e~{\rm cm}$.
| [
{
"created": "Fri, 5 Apr 2024 08:53:59 GMT",
"version": "v1"
}
] | 2024-04-08 | [
[
"Abe",
"Tomohiro",
""
],
[
"Sato",
"Ryosuke",
""
],
[
"Yamanaka",
"Takumu",
""
]
] | A dark matter model based on QCD-like $SU(N_c)$ gauge theory with electroweakly interacting dark quarks is discussed. Assuming the dark quark mass $m$ is smaller than the dynamical scale $\Lambda_d \sim 4\pi f_d$, the main component of the dark matter is the lightest $G$-parity odd dark pion associated with chiral symmetry breaking in the dark sector. We show that nonzero dark quark mass induces the universal mass contribution to both $G$-parity odd and even pions, and their masses tend to be degenerate. As a result, dark pion annihilation into heavier $G$-parity even dark pion also affects the dark matter relic abundance. Thus, our setup naturally accommodates forbidden dark matter scenario and realizes heavy dark matter whose mass is ${\cal O}(1$-$100)~{\rm TeV}$, which is different from conventional electroweakly interacting dark matter such as minimal dark matter. We also discuss CP-violation from $\theta$-term in the dark gauge sector and find that the predicted size of electron electric dipole moment can be as large as $\sim 10^{-32}~e~{\rm cm}$. |
0901.1294 | Stefano Forte | Stefano Forte, Guido Altarelli, Richard D. Ball | Can we trust small x resummation? | 12 pages, 12 figures; LaTeX with espcrc2.sty. Talk given at the 2008
Ringberg workshop "New Trends in HERA Physics" | null | 10.1016/j.nuclphysbps.2009.03.114 | IFUM-935-FT | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review the current status of small x resummation of evolution of parton
distributions and of deep-inelastic coefficient functions. We show that the
resummed perturbative expansion is stable, robust upon different treatments of
subleading terms, and that it matches smoothly to the unresummed perturbative
expansions, with corrections which are of the same order as the typical NNLO
ones in the HERA kinematic region. We discuss different approaches to small x
resummation: we show that the ambiguities in the resummation procedure are
small, provided all parametrically enhanced terms are included in the
resummation and properly matched.
| [
{
"created": "Fri, 9 Jan 2009 18:49:49 GMT",
"version": "v1"
}
] | 2015-05-13 | [
[
"Forte",
"Stefano",
""
],
[
"Altarelli",
"Guido",
""
],
[
"Ball",
"Richard D.",
""
]
] | We review the current status of small x resummation of evolution of parton distributions and of deep-inelastic coefficient functions. We show that the resummed perturbative expansion is stable, robust upon different treatments of subleading terms, and that it matches smoothly to the unresummed perturbative expansions, with corrections which are of the same order as the typical NNLO ones in the HERA kinematic region. We discuss different approaches to small x resummation: we show that the ambiguities in the resummation procedure are small, provided all parametrically enhanced terms are included in the resummation and properly matched. |
1907.01151 | Xin-Xin Ma | Hai-Bo Li and Xin-Xin Ma | Polarization difference between hyperons and anti-hyperons induced by
external magnetic field | null | Phys. Rev. D 100, 076007 (2019) | 10.1103/PhysRevD.100.076007 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the quantum correlated $\Lambda \bar{\Lambda} $ production in
the reaction $e^{+}e^{-} \to J/\psi \to \Lambda \bar{\Lambda}$. Since the
$\Lambda$ or $\bar{\Lambda}$ has a nonzero magnetic moment, its spin will
undergo a Larmor precession in the magnetic field of the detector, such as the
BESIII experiment. Because of the spin precession, the angular distribution of
the $\Lambda$ and $\bar{\Lambda}$ is slightly modified. Therefore, we obtain
the corresponding term of the modified angular distribution due to the effect
of the Larmor precession. We also estimate its potential effect on the
measurements of $CP$ violation, as well as the decay asymmetry parameter and
polarization of $\Lambda$. The polarization of the $\Lambda$ or $\bar{\Lambda}$
at the production vertex will rotate around the $B$-field axis, over an angle
depending on the flight length in, but it still could be measured by fit to the
corrected angular distribution. Of important, We conclude that a nonzero $CP$
asymmetry of order $10^{-4}$ will be caused once neglecting spin precession of
the $\Lambda$ and $\bar{\Lambda}$ in the $e^{+}e^{-} \to J/\psi \to \Lambda
\bar{\Lambda}$ process. The size of this $CP$ asymmetry is several times that
of predicted within Standard Model in the hyperon decay. Although this effect
is small, it will play an important role in future high precision experiments,
such as the super-tau-charm factory.
| [
{
"created": "Tue, 2 Jul 2019 04:01:14 GMT",
"version": "v1"
},
{
"created": "Fri, 23 Aug 2019 08:23:26 GMT",
"version": "v2"
}
] | 2019-10-16 | [
[
"Li",
"Hai-Bo",
""
],
[
"Ma",
"Xin-Xin",
""
]
] | We investigate the quantum correlated $\Lambda \bar{\Lambda} $ production in the reaction $e^{+}e^{-} \to J/\psi \to \Lambda \bar{\Lambda}$. Since the $\Lambda$ or $\bar{\Lambda}$ has a nonzero magnetic moment, its spin will undergo a Larmor precession in the magnetic field of the detector, such as the BESIII experiment. Because of the spin precession, the angular distribution of the $\Lambda$ and $\bar{\Lambda}$ is slightly modified. Therefore, we obtain the corresponding term of the modified angular distribution due to the effect of the Larmor precession. We also estimate its potential effect on the measurements of $CP$ violation, as well as the decay asymmetry parameter and polarization of $\Lambda$. The polarization of the $\Lambda$ or $\bar{\Lambda}$ at the production vertex will rotate around the $B$-field axis, over an angle depending on the flight length in, but it still could be measured by fit to the corrected angular distribution. Of important, We conclude that a nonzero $CP$ asymmetry of order $10^{-4}$ will be caused once neglecting spin precession of the $\Lambda$ and $\bar{\Lambda}$ in the $e^{+}e^{-} \to J/\psi \to \Lambda \bar{\Lambda}$ process. The size of this $CP$ asymmetry is several times that of predicted within Standard Model in the hyperon decay. Although this effect is small, it will play an important role in future high precision experiments, such as the super-tau-charm factory. |
1405.1152 | Jing Shu | Weicong Huang, Zhaofeng Kang, Jing Shu, Peiwen Wu and Jin Min Yang | New Insights of Electroweak Phase Transition in NMSSM | 27 pages, 15 figures, 1 table | Phys. Rev. D 91, 025006 (2015) | 10.1103/PhysRevD.91.025006 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We perform a detailed semi-analytical analysis of the electroweak phase
transition (EWPT) property in NMSSM, which serves as a good benchmark model in
which the 126 GeV Higgs mixes with a singlet. In this case, a strongly first
order electroweak phase transition (SFOEWPT) is achieved by the tree-level
effects and the phase transition strength $\gamma_c$ is determined by the vacua
energy gap at $T=0$. We make an anatomy of the energy gap at both tree-level
and loop-level and extract out a dimensionless phase transition parameter
$R_\kappa \equiv 4 \kappa v_s / A_\kappa$, which can replace $A_\kappa$ in the
parameterization and affect the light CP odd and even Higgs spectra. We find
that SFOEWPT only occurs in $R_\kappa \sim -1$ and positive $R_\kappa \lesssim
\mathcal{O}(10)$, which in the non-PQ limit case would prefer either a
relatively light CP odd or CP even Higgs boson $\sim (60, 100)$ GeV, therefore
serves as a smoking gun signal and requires new search strategies at the LHC.
| [
{
"created": "Tue, 6 May 2014 05:02:42 GMT",
"version": "v1"
}
] | 2015-01-14 | [
[
"Huang",
"Weicong",
""
],
[
"Kang",
"Zhaofeng",
""
],
[
"Shu",
"Jing",
""
],
[
"Wu",
"Peiwen",
""
],
[
"Yang",
"Jin Min",
""
]
] | We perform a detailed semi-analytical analysis of the electroweak phase transition (EWPT) property in NMSSM, which serves as a good benchmark model in which the 126 GeV Higgs mixes with a singlet. In this case, a strongly first order electroweak phase transition (SFOEWPT) is achieved by the tree-level effects and the phase transition strength $\gamma_c$ is determined by the vacua energy gap at $T=0$. We make an anatomy of the energy gap at both tree-level and loop-level and extract out a dimensionless phase transition parameter $R_\kappa \equiv 4 \kappa v_s / A_\kappa$, which can replace $A_\kappa$ in the parameterization and affect the light CP odd and even Higgs spectra. We find that SFOEWPT only occurs in $R_\kappa \sim -1$ and positive $R_\kappa \lesssim \mathcal{O}(10)$, which in the non-PQ limit case would prefer either a relatively light CP odd or CP even Higgs boson $\sim (60, 100)$ GeV, therefore serves as a smoking gun signal and requires new search strategies at the LHC. |
1405.7864 | Vincenzo Branchina | Vincenzo Branchina | Stability of the EW vacuum, Higgs boson, and new physics | 4 pages, 2 figures, talk given at Moriond 2014 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The possibility that the Standard Model (SM) is valid up to the Planck scale
$M_P$, i.e. that new physics occurs only around $M_P$, is nowadays largely
explored. For a metastable EW vacuum, we show that new physics interactions can
have a great impact on its lifetime, and, differently from previous analyses,
they cannot be neglected. Therefore, contrary to usual believes, the stability
phase diagram of the SM depends on new physics. This has far reaching
consequences. Beyond SM theories can be tested against their prediction for the
stability of the EW vacuum. Moreover, despite of some recent claims, higher
precision measurements of the top and Higgs masses cannot provide any definite
answer on the SM stability properties. Finally, doubts on Higgs inflation
scenarios, all based on results obtained neglecting new physics interactions,
are also cast.
| [
{
"created": "Fri, 30 May 2014 13:48:08 GMT",
"version": "v1"
}
] | 2014-06-02 | [
[
"Branchina",
"Vincenzo",
""
]
] | The possibility that the Standard Model (SM) is valid up to the Planck scale $M_P$, i.e. that new physics occurs only around $M_P$, is nowadays largely explored. For a metastable EW vacuum, we show that new physics interactions can have a great impact on its lifetime, and, differently from previous analyses, they cannot be neglected. Therefore, contrary to usual believes, the stability phase diagram of the SM depends on new physics. This has far reaching consequences. Beyond SM theories can be tested against their prediction for the stability of the EW vacuum. Moreover, despite of some recent claims, higher precision measurements of the top and Higgs masses cannot provide any definite answer on the SM stability properties. Finally, doubts on Higgs inflation scenarios, all based on results obtained neglecting new physics interactions, are also cast. |
hep-ph/0301061 | Jose W. F. Valle | S. Pakvasa, J. W. F. Valle | Neutrino Properties Before and After KamLAND | Invited contribution to a special issue of the Proceedings of the
Indian National Academy of Sciences on "Neutrinos", 66 pages, 30 figs, latex,
corrected some typos and refs | Proc.Indian Natl.Sci.Acad.70A:189-222,2004 | null | IFIC/02-66 | hep-ph astro-ph hep-ex | null | We review neutrino oscillation physics, including the determination of mass
splittings and mixings from current solar, atmospheric, reactor and accelerator
neutrino data. A brief discussion is given of cosmological and astrophysical
implications. Non-oscillation phenomena such as neutrinoless double beta decay
would, if discovered, probe the absolute scale of neutrino mass and also reveal
their Majorana nature. Non-oscillation descriptions in terms of spin-flavor
precession (SFP) and non-standard neutrino interactions (NSI) currently provide
an excellent fit of the solar data. However they are at odds with the first
results from the KamLAND experiment which imply that, despite their theoretical
interest, non-standard mechanisms can only play a sub-leading role in the solar
neutrino anomaly. Accepting the LMA-MSW solution, one can use the current solar
neutrino data to place important restrictions on non-standard neutrino
properties, such as neutrino magnetic moments. Both solar and atmospheric
neutrino data can also be used to place constraints on neutrino instability as
well as the more exotic possibility of $CPT$ and Lorentz Violation.
Weillustrate the potential of future data from experiments such as KamLAND,
Borexino and the upcoming neutrino factories in constraining non-standard
neutrino properties.
| [
{
"created": "Thu, 9 Jan 2003 19:45:07 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Feb 2003 11:25:27 GMT",
"version": "v2"
}
] | 2009-09-17 | [
[
"Pakvasa",
"S.",
""
],
[
"Valle",
"J. W. F.",
""
]
] | We review neutrino oscillation physics, including the determination of mass splittings and mixings from current solar, atmospheric, reactor and accelerator neutrino data. A brief discussion is given of cosmological and astrophysical implications. Non-oscillation phenomena such as neutrinoless double beta decay would, if discovered, probe the absolute scale of neutrino mass and also reveal their Majorana nature. Non-oscillation descriptions in terms of spin-flavor precession (SFP) and non-standard neutrino interactions (NSI) currently provide an excellent fit of the solar data. However they are at odds with the first results from the KamLAND experiment which imply that, despite their theoretical interest, non-standard mechanisms can only play a sub-leading role in the solar neutrino anomaly. Accepting the LMA-MSW solution, one can use the current solar neutrino data to place important restrictions on non-standard neutrino properties, such as neutrino magnetic moments. Both solar and atmospheric neutrino data can also be used to place constraints on neutrino instability as well as the more exotic possibility of $CPT$ and Lorentz Violation. Weillustrate the potential of future data from experiments such as KamLAND, Borexino and the upcoming neutrino factories in constraining non-standard neutrino properties. |
hep-ph/9304291 | null | Markus A. Luty and Martin White | $SU(3)$ vs. $SU(3) \times SU(3)$ Breaking in Weak Hyperon Decays | 15 pages, LBL-33993/CfPA-TH-93-09. (Eliminated multiple fonts in
title; some versions of TeX apparently cannot handle this. No change in
text.) | null | null | null | hep-ph | null | We consider the predictions of chiral perturbation theory for $SU(3)$
breaking in weak semileptonic and $s$-wave nonleptonic hyperon decays. By
defining an expansion sensitive only to $SU(3)$ breaking, we show that the
leading corrections give rise to moderate corrections to $SU(3)$ relations
($\lsim 20\%$), even though the {\it chiral} symmetry $SU(3) \times SU(3)$
appears to be rather badly broken. This explains why $SU(3)$ fits to weak
hyperon decays work well even though chiral-symmetry breaking corrections are
large. Applying these $SU(3)$-breaking corrections to the analysis of the EMC
data, we find that the predicted value of $\bra p\mybar s\gamma_\mu\gamma_5
s\ket p$ is reduced by $\simeq 35\%$, suggesting that the ``EMC effect'' may be
less striking than commonly thought.
| [
{
"created": "Fri, 23 Apr 1993 02:01:13 GMT",
"version": "v1"
},
{
"created": "Sat, 24 Apr 1993 21:22:54 GMT",
"version": "v2"
}
] | 2008-02-03 | [
[
"Luty",
"Markus A.",
""
],
[
"White",
"Martin",
""
]
] | We consider the predictions of chiral perturbation theory for $SU(3)$ breaking in weak semileptonic and $s$-wave nonleptonic hyperon decays. By defining an expansion sensitive only to $SU(3)$ breaking, we show that the leading corrections give rise to moderate corrections to $SU(3)$ relations ($\lsim 20\%$), even though the {\it chiral} symmetry $SU(3) \times SU(3)$ appears to be rather badly broken. This explains why $SU(3)$ fits to weak hyperon decays work well even though chiral-symmetry breaking corrections are large. Applying these $SU(3)$-breaking corrections to the analysis of the EMC data, we find that the predicted value of $\bra p\mybar s\gamma_\mu\gamma_5 s\ket p$ is reduced by $\simeq 35\%$, suggesting that the ``EMC effect'' may be less striking than commonly thought. |
1001.2668 | Alexander Smirnov | Alexander V. Smirnov, Vladimir A. Smirnov, Matthias Steinhauser | Full result for the three-loop static quark potential | To appear in the proceedings of 9th International Symposium on
Radiative Corrections (RADCOR 2009): Applications of Quantum Field Theory to
Phenomenology, Ascona, Switzerland, 25-30 Oct 2009 | PoS (RADCOR 2009) 075 | null | SFB/CPP-10-08, TTP10-03 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The three-loop corrections to the potential of two heavy quarks are computed.
Analytic results for the most complicated master integrals are presented.
| [
{
"created": "Fri, 15 Jan 2010 11:49:15 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Feb 2010 17:04:11 GMT",
"version": "v2"
},
{
"created": "Thu, 18 Feb 2010 11:49:41 GMT",
"version": "v3"
}
] | 2010-02-18 | [
[
"Smirnov",
"Alexander V.",
""
],
[
"Smirnov",
"Vladimir A.",
""
],
[
"Steinhauser",
"Matthias",
""
]
] | The three-loop corrections to the potential of two heavy quarks are computed. Analytic results for the most complicated master integrals are presented. |
2212.06106 | Frank Deppisch | James A. L. Canning, Frank F. Deppisch, Wenna Pei | Sensitivity of Future Tritium Decay Experiments to New Physics | 44 pages, 14 figures, matches accepted version | null | 10.1007/JHEP03(2023)144 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Tritium beta-decay is the most promising approach to measure the absolute
masses of active light neutrinos in the laboratory and in a model-independent
fashion. The development of Cyclotron Radiation Emission Spectroscopy
techniques and the use of atomic tritium has the potential to improve the
current limits by an order of magnitude in future experiments. In this paper,
we analyse the potential sensitivity of such future searches to keV-mass
sterile neutrinos and exotic interactions of either the active or sterile
neutrinos. We calculate the relevant decay distributions in both energy and
angle of the emitted electron with respect to a potential polarisation of the
tritium, including the interference with the Standard Model case as well as
incorporating relevant final state corrections for atomic tritium. We present
projected sensitivities on the active-sterile neutrino mixing and effective
coupling constants of exotic currents, demonstrating the potential to probe New
Physics in tritium experiments.
| [
{
"created": "Mon, 12 Dec 2022 18:29:34 GMT",
"version": "v1"
},
{
"created": "Sun, 26 Mar 2023 22:55:44 GMT",
"version": "v2"
}
] | 2023-04-05 | [
[
"Canning",
"James A. L.",
""
],
[
"Deppisch",
"Frank F.",
""
],
[
"Pei",
"Wenna",
""
]
] | Tritium beta-decay is the most promising approach to measure the absolute masses of active light neutrinos in the laboratory and in a model-independent fashion. The development of Cyclotron Radiation Emission Spectroscopy techniques and the use of atomic tritium has the potential to improve the current limits by an order of magnitude in future experiments. In this paper, we analyse the potential sensitivity of such future searches to keV-mass sterile neutrinos and exotic interactions of either the active or sterile neutrinos. We calculate the relevant decay distributions in both energy and angle of the emitted electron with respect to a potential polarisation of the tritium, including the interference with the Standard Model case as well as incorporating relevant final state corrections for atomic tritium. We present projected sensitivities on the active-sterile neutrino mixing and effective coupling constants of exotic currents, demonstrating the potential to probe New Physics in tritium experiments. |
1506.08896 | Marat Freytsis | Marat Freytsis, Zoltan Ligeti, Joshua T. Ruderman | Flavor models for $\bar{B} \to D^{(*)} \tau \bar{\nu}$ | 12 pages, 4 figures, v2: references added, v3: preliminary HFAG world
average numbers updated, journal version, v4: sign error and subsequent
discussion in Sec. III.B.3 corrected, all other results unaffected | Phys. Rev. D 92, 054018 (2015) | 10.1103/PhysRevD.92.054018 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The ratio of the measured $\bar B\to D^{(*)}\ell\bar{\nu}$ decay rates for
$\ell = \tau$ vs. $e,\mu$ deviate from the Standard Model (SM) by about
$4\sigma$. We show that the data are in tension with the SM, independent of
form factor calculations, and we update the SM prediction for $\mathcal{B}(B\to
X_c\tau\bar{\nu}) / \mathcal{B}(B\to X_c \ell\bar{\nu})$. We classify the
operators that can accommodate the measured central values, as well as their UV
completions. We identify models with leptoquark mediators that are minimally
flavor violating in the quark sector, and are minimally flavor violating or
$\tau$-aligned in the lepton sector. We explore experimental signatures of
these scenarios, which are observable in the future at ATLAS/CMS, LHCb, or
Belle II.
| [
{
"created": "Mon, 29 Jun 2015 23:46:14 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Jul 2015 04:22:08 GMT",
"version": "v2"
},
{
"created": "Wed, 16 Sep 2015 02:17:17 GMT",
"version": "v3"
},
{
"created": "Mon, 16 Oct 2017 05:39:57 GMT",
"version": "v4"
}
] | 2017-10-17 | [
[
"Freytsis",
"Marat",
""
],
[
"Ligeti",
"Zoltan",
""
],
[
"Ruderman",
"Joshua T.",
""
]
] | The ratio of the measured $\bar B\to D^{(*)}\ell\bar{\nu}$ decay rates for $\ell = \tau$ vs. $e,\mu$ deviate from the Standard Model (SM) by about $4\sigma$. We show that the data are in tension with the SM, independent of form factor calculations, and we update the SM prediction for $\mathcal{B}(B\to X_c\tau\bar{\nu}) / \mathcal{B}(B\to X_c \ell\bar{\nu})$. We classify the operators that can accommodate the measured central values, as well as their UV completions. We identify models with leptoquark mediators that are minimally flavor violating in the quark sector, and are minimally flavor violating or $\tau$-aligned in the lepton sector. We explore experimental signatures of these scenarios, which are observable in the future at ATLAS/CMS, LHCb, or Belle II. |
1703.04439 | Yilei Tang | Yi-Lei Tang, Shou-hua Zhu | The $\nu$THDM with the Inverse Seesaw Mechanisms | null | Phys. Rev. D 96, 055022 (2017) | 10.1103/PhysRevD.96.055022 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we combine the $\nu$-Two-Higgs-Doublet-Model ($\nu$THDM) with
the inverse seesaw mechanisms. In this model, the Yukawa couplings involving
the sterile neutrinos and the exotic Higgs bosons can be of order one in the
case of a large $\tan \beta$. We calculated the corrections to the Z-resonance
parameters $R_{l_i}$, $A_{l_i}$, $N_{\nu}$, together with the $l_1 \rightarrow
l_2 \gamma$ branching ratios, and the muon anomalous $g-2$. Compared with the
current bounds and plans for the future colliders, we find that the corrections
to the electroweak parameters can be contrained or discovered in much of the
parameter space.
| [
{
"created": "Mon, 13 Mar 2017 15:13:04 GMT",
"version": "v1"
}
] | 2017-09-27 | [
[
"Tang",
"Yi-Lei",
""
],
[
"Zhu",
"Shou-hua",
""
]
] | In this paper, we combine the $\nu$-Two-Higgs-Doublet-Model ($\nu$THDM) with the inverse seesaw mechanisms. In this model, the Yukawa couplings involving the sterile neutrinos and the exotic Higgs bosons can be of order one in the case of a large $\tan \beta$. We calculated the corrections to the Z-resonance parameters $R_{l_i}$, $A_{l_i}$, $N_{\nu}$, together with the $l_1 \rightarrow l_2 \gamma$ branching ratios, and the muon anomalous $g-2$. Compared with the current bounds and plans for the future colliders, we find that the corrections to the electroweak parameters can be contrained or discovered in much of the parameter space. |
hep-ph/9807378 | Kunihiko Terasaki | K. Terasaki (YITP, Kyoto University) | Non-factorizable contributions in hadronic weak decays of charm mesons | 22 pages, RevTex | Phys.Rev. D59 (1999) 114001 | 10.1103/PhysRevD.59.114001 | YITP-98-37 | hep-ph | null | Two body decays of charm mesons are studied by describing their amplitude in
terms of a sum of factorizable and non-factorizable ones. The former is
estimated by using a naive factorization while the latter is calculated by
using a hard pseudo-scalar-meson approximation. The hard pseudo-scalar-meson
amplitude is given by a sum of the so-called equal-time commutator term and
surface term which contains all possible pole contributions of various mesons,
not only the ordinary $\{q\bar q\}$ but also four-quark $\{qq\bar q\bar q\}$,
hybrid $\{q\bar qg\}$ and glue-balls.
Naively factorized amplitudes for the spectator decays which lead to too big
rates can interfere destructively with exotic meson pole amplitudes and the
total amplitudes can reproduce their observed rates. The non-factorizable
contributions can supply sufficiently large contributions to the color
suppressed decays which are strongly suppressed in the naive factorization. A
possible solution to the long standing puzzle that the ratio of decay rates for
$D^0\to K^+K^-$ to $D^0\to \pi^+\pi^-$ is around 2.5 is given by different
contributions of exotic meson poles.
| [
{
"created": "Wed, 15 Jul 1998 03:46:15 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Terasaki",
"K.",
"",
"YITP, Kyoto University"
]
] | Two body decays of charm mesons are studied by describing their amplitude in terms of a sum of factorizable and non-factorizable ones. The former is estimated by using a naive factorization while the latter is calculated by using a hard pseudo-scalar-meson approximation. The hard pseudo-scalar-meson amplitude is given by a sum of the so-called equal-time commutator term and surface term which contains all possible pole contributions of various mesons, not only the ordinary $\{q\bar q\}$ but also four-quark $\{qq\bar q\bar q\}$, hybrid $\{q\bar qg\}$ and glue-balls. Naively factorized amplitudes for the spectator decays which lead to too big rates can interfere destructively with exotic meson pole amplitudes and the total amplitudes can reproduce their observed rates. The non-factorizable contributions can supply sufficiently large contributions to the color suppressed decays which are strongly suppressed in the naive factorization. A possible solution to the long standing puzzle that the ratio of decay rates for $D^0\to K^+K^-$ to $D^0\to \pi^+\pi^-$ is around 2.5 is given by different contributions of exotic meson poles. |
2003.02024 | Snigdha Ghosh | Snigdha Ghosh, Arghya Mukherjee, Nilanjan Chaudhuri, Pradip Roy and
Sourav Sarkar | Thermo-magnetic spectral properties of neutral mesons in vector and
axial-vector channels using NJL model | Version published in Physical Review D | Phys. Rev. D 101, 056023 (2020) | 10.1103/PhysRevD.101.056023 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work the neutral meson properties have been investigated in the
presence of thermo-magnetic background using two-flavor Nambu--Jona-Lasinio
model. Mass, spectral function and dispersion relations are obtained in the
scalar ($\sigma$) and pseudo-scalar ($\pi^0$) channels as well as in the vector
($\rho^0$) and axial vector ($a^0_1$) channels. The general Lorentz structures
for the vector and axial-vector meson polarization functions have been
considered in detail. The ultra-violet divergences appearing in this work have
been regularized using a mixed regularization technique where the gamma
functions arising in dimensional regularization are replaced with incomplete
gamma functions as usually done in the proper time regularization procedure.
The meson spectral functions obtained in the presence of a magnetic field
possess nontrivial oscillatory structure. Similar to the scalar and
pseudo-scalar channel, the spectral functions for each of the modes of $\rho^0$
are observed to overlap with the corresponding modes of its chiral partner
$a_1^0$ mesons in the chiral symmetry restored phase. We observe
discontinuities in the masses of all the mesonic excitations for a non-zero
external magnetic field.
| [
{
"created": "Wed, 4 Mar 2020 12:01:48 GMT",
"version": "v1"
},
{
"created": "Wed, 1 Apr 2020 06:50:00 GMT",
"version": "v2"
}
] | 2020-04-08 | [
[
"Ghosh",
"Snigdha",
""
],
[
"Mukherjee",
"Arghya",
""
],
[
"Chaudhuri",
"Nilanjan",
""
],
[
"Roy",
"Pradip",
""
],
[
"Sarkar",
"Sourav",
""
]
] | In this work the neutral meson properties have been investigated in the presence of thermo-magnetic background using two-flavor Nambu--Jona-Lasinio model. Mass, spectral function and dispersion relations are obtained in the scalar ($\sigma$) and pseudo-scalar ($\pi^0$) channels as well as in the vector ($\rho^0$) and axial vector ($a^0_1$) channels. The general Lorentz structures for the vector and axial-vector meson polarization functions have been considered in detail. The ultra-violet divergences appearing in this work have been regularized using a mixed regularization technique where the gamma functions arising in dimensional regularization are replaced with incomplete gamma functions as usually done in the proper time regularization procedure. The meson spectral functions obtained in the presence of a magnetic field possess nontrivial oscillatory structure. Similar to the scalar and pseudo-scalar channel, the spectral functions for each of the modes of $\rho^0$ are observed to overlap with the corresponding modes of its chiral partner $a_1^0$ mesons in the chiral symmetry restored phase. We observe discontinuities in the masses of all the mesonic excitations for a non-zero external magnetic field. |
2012.11720 | Oleg Teryaev | O.V. Teryaev | Kinematic Azimuthal Asymmetries and Lam-Tung Relation | 3 pages, Published in Proceedings of XI WORKSHOP ON HIGH ENERGY SPIN
PHYSICS (SPIN-05, Dubna, September 27 - October 1, 2005,
http://theor.jinr.ru/meetings/2005/spin2005/ ), p.171-174 | null | null | null | hep-ph nucl-th | http://creativecommons.org/licenses/by/4.0/ | The origin of Lam-Tung relation for the angular asymmetry of Drell-Yan
dileptons is analyzed. The asymmetry constrained by this relation is shown to
belongto the class of kinematic azimuthal asymmetries, emerging due to the
deviation of the reference axis from the natural physical one. The validity and
violation of Lam-Tung relation due to radiative and power QCD corrections is
discussed. The relation is generalized to the case when the virtual photon is
not the transverse oneand the possible applications are suggested.
| [
{
"created": "Mon, 21 Dec 2020 22:27:04 GMT",
"version": "v1"
}
] | 2020-12-23 | [
[
"Teryaev",
"O. V.",
""
]
] | The origin of Lam-Tung relation for the angular asymmetry of Drell-Yan dileptons is analyzed. The asymmetry constrained by this relation is shown to belongto the class of kinematic azimuthal asymmetries, emerging due to the deviation of the reference axis from the natural physical one. The validity and violation of Lam-Tung relation due to radiative and power QCD corrections is discussed. The relation is generalized to the case when the virtual photon is not the transverse oneand the possible applications are suggested. |
0712.0207 | Jeonghyeon Song | Sanghyeon Chang, C.S. Kim, Jeonghyeon Song | Custodial bulk Randall-Sundrum model and B->K* l+ l'- | references added with minor changes | Phys.Rev.D77:075001,2008 | 10.1103/PhysRevD.77.075001 | null | hep-ph | null | The custodial Randall-Sundrum model based on SU(2)_L X SU(2)_R X U(1)_(B-L)
generates new flavor-changing-neutral-current (FCNC) phenomena at tree level,
mediated by Kaluza-Klein neutral gauge bosons. Based on two natural assumptions
of universal 5D Yukawa couplings and no-cancellation in explaining the observed
standard model fermion mixing matrices, we determine the bulk Dirac mass
parameters. Phenomenological constraints from lepton-flavor-violations are also
used to specify the model. From the comprehensive study of B->K* l+ l'-, we
found that only the B->K*ee decay has sizable new physics effects. The zero
value position of the forward-backward asymmetry in this model is also
evaluated, with about 5% deviation from the SM result. Other effective
observables are also suggested such as the ratio of two differential (or
partially integrated) decay rates of B->K*ee and B->K*mu mu. For the first KK
gauge boson mass of M_A^(1)=2-4 TeV, we can have about 10-20% deviation from
the SM results.
| [
{
"created": "Mon, 3 Dec 2007 03:04:06 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Dec 2007 01:28:17 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Chang",
"Sanghyeon",
""
],
[
"Kim",
"C. S.",
""
],
[
"Song",
"Jeonghyeon",
""
]
] | The custodial Randall-Sundrum model based on SU(2)_L X SU(2)_R X U(1)_(B-L) generates new flavor-changing-neutral-current (FCNC) phenomena at tree level, mediated by Kaluza-Klein neutral gauge bosons. Based on two natural assumptions of universal 5D Yukawa couplings and no-cancellation in explaining the observed standard model fermion mixing matrices, we determine the bulk Dirac mass parameters. Phenomenological constraints from lepton-flavor-violations are also used to specify the model. From the comprehensive study of B->K* l+ l'-, we found that only the B->K*ee decay has sizable new physics effects. The zero value position of the forward-backward asymmetry in this model is also evaluated, with about 5% deviation from the SM result. Other effective observables are also suggested such as the ratio of two differential (or partially integrated) decay rates of B->K*ee and B->K*mu mu. For the first KK gauge boson mass of M_A^(1)=2-4 TeV, we can have about 10-20% deviation from the SM results. |
hep-ph/9610264 | Pyungwon Ko | Jihn E. Kim (Seoul National University, Korea) | Can Strong QCD in the Early Universe Raise the Axion Decay Constant? | Invited talk given in ICHEP'96, Poland. To appear in the proceeding.
The tex file, one figure and the stwol.sty files are all included. | null | null | SNUTP 96-107 | hep-ph | null | We report that the hypothesis that the upper bound on the axion decay
constant can be moved up beyond $10^{12}$ GeV in models with a stronger QCD in
the early universe is not realized. This proof is possible by studying the
superpotential in the dual model and obtaining the form of the axion potential
respecting the original global symmetries.
| [
{
"created": "Mon, 7 Oct 1996 06:48:28 GMT",
"version": "v1"
}
] | 2016-09-06 | [
[
"Kim",
"Jihn E.",
"",
"Seoul National University, Korea"
]
] | We report that the hypothesis that the upper bound on the axion decay constant can be moved up beyond $10^{12}$ GeV in models with a stronger QCD in the early universe is not realized. This proof is possible by studying the superpotential in the dual model and obtaining the form of the axion potential respecting the original global symmetries. |
hep-ph/9505332 | Matteo Cacciari | Matteo Cacciari | Phenomenology of ``Onium'' Production | Invited talk given at the XXX Rencontres de Moriond. 6 pages, LaTeX,
2 embedded figures missing. Complete postscript file available as
http://cobra4.pv.infn.it:8080/papers/moriond.ps.Z | null | null | FNT/T-95/14 | hep-ph | null | The phenomenology of heavy quarkonia production in hadron collisions is
reviewed. The theoretical predictions are compared to data. Commonly used
production models are shown to fail in explaining all the experimental
findings. The shortcomings of these models are analysed and possible
improvements are discussed.
| [
{
"created": "Thu, 18 May 1995 13:07:28 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Cacciari",
"Matteo",
""
]
] | The phenomenology of heavy quarkonia production in hadron collisions is reviewed. The theoretical predictions are compared to data. Commonly used production models are shown to fail in explaining all the experimental findings. The shortcomings of these models are analysed and possible improvements are discussed. |
hep-ph/0112024 | Urjit A. Yajnik | S. Mohanty and U. A. Yajnik | Neutrino and astroparticle physics : Working group report | 11 pages; arXiv copy of contribution to WHEPP-6 proceedings | Pramana 55:315-325,2000 | 10.1007/s12043-000-0111-4 | null | hep-ph | null | The contributions made to the Working Group activities on neutrino and
astroparticle physics are summarised in this article. The topics discussed were
leptogenesis in Left-Right symmetric model, inflationary models in
Raman-Sundrum scenarios, ultra high energy cosmic rays and neutrino
oscillations in 4 flavour and decaying neutrino models.
| [
{
"created": "Mon, 3 Dec 2001 13:00:25 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Mohanty",
"S.",
""
],
[
"Yajnik",
"U. A.",
""
]
] | The contributions made to the Working Group activities on neutrino and astroparticle physics are summarised in this article. The topics discussed were leptogenesis in Left-Right symmetric model, inflationary models in Raman-Sundrum scenarios, ultra high energy cosmic rays and neutrino oscillations in 4 flavour and decaying neutrino models. |
1502.02457 | Jian Zhou Mr. | Jian Zhou | Transverse single spin asymmetry in Drell-Yan production in polarized pA
collisions | 15 pages, 1 figure | Phys. Rev. D 92, 014034 (2015) | 10.1103/PhysRevD.92.014034 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the transverse single spin asymmetry in Drell-Yan production in pA
collisions with incoming protons being transversely polarized. We carry out the
calculation using a newly developed hybrid approach. The polarized cross
section computed in the hybrid approach is consistent with that obtained from
the usual TMD factorization at low transverse momentum as expected, whereas at
high transverse momentum, color entanglement effect is found to play a role in
contributing to the spin asymmetry of Drell-Yan production, though it is a
$1/N_c^2$ suppressed effect.
| [
{
"created": "Mon, 9 Feb 2015 12:20:27 GMT",
"version": "v1"
}
] | 2015-08-05 | [
[
"Zhou",
"Jian",
""
]
] | We study the transverse single spin asymmetry in Drell-Yan production in pA collisions with incoming protons being transversely polarized. We carry out the calculation using a newly developed hybrid approach. The polarized cross section computed in the hybrid approach is consistent with that obtained from the usual TMD factorization at low transverse momentum as expected, whereas at high transverse momentum, color entanglement effect is found to play a role in contributing to the spin asymmetry of Drell-Yan production, though it is a $1/N_c^2$ suppressed effect. |
2011.06447 | Benoit Assi | B. Assi, B.A. Kniehl, J. Soto | Matching the Standard Model to Heavy-Quark Effective Theory and
Nonrelativistic QCD | 16 pages, 5 figures, revised, matches published version, author added | null | 10.1016/j.nuclphysb.2023.116173 | DESY20--212 | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We find the leading electroweak corrections to the Lagrangians of heavy-quark
effective theory and nonrelativistic QCD. These corrections appear in the
Wilson coefficients of the two- and four-quark operators and are considered
here at one-loop order through $\mathcal{O}(1/m^3)$ and $\mathcal{O}(1/m^2)$,
respectively. The two-quark operators through this order include new parity
violating terms, which we derive analogously to the parity preserving QCD
result at one-loop order.
| [
{
"created": "Thu, 12 Nov 2020 15:40:40 GMT",
"version": "v1"
},
{
"created": "Sun, 15 Nov 2020 19:39:51 GMT",
"version": "v2"
},
{
"created": "Fri, 2 Jun 2023 18:14:21 GMT",
"version": "v3"
}
] | 2023-06-06 | [
[
"Assi",
"B.",
""
],
[
"Kniehl",
"B. A.",
""
],
[
"Soto",
"J.",
""
]
] | We find the leading electroweak corrections to the Lagrangians of heavy-quark effective theory and nonrelativistic QCD. These corrections appear in the Wilson coefficients of the two- and four-quark operators and are considered here at one-loop order through $\mathcal{O}(1/m^3)$ and $\mathcal{O}(1/m^2)$, respectively. The two-quark operators through this order include new parity violating terms, which we derive analogously to the parity preserving QCD result at one-loop order. |
1505.05379 | Jun He Dr. | Jun He | $Z_c(3900)$ as a resonance from the $D\bar{D}^*$ interaction | 7 pages, 3 figures | Phys. Rev. D 92, 034004 (2015) | 10.1103/PhysRevD.92.034004 | null | hep-ph hep-ex hep-lat nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper it is proposed that the charged charmonium-like state
$Z_c(3900)$ is a resonance above the threshold from the $D\bar{D}^*$
interaction. The $D\bar{D}^*$ interaction is described by the one-boson
exchange model with light meson exchanges plus a short-range $J/\psi$ exchange.
The scattering amplitude is calculated within a Bethe-Salpeter equation
approach and the poles near the $D\bar{D}^*$ threshold are searched. In the
isoscalar sector, two poles found under the $D\bar{D}^*$ threshold, i.e., bound
states, have the quantum numbers $I^G(J^{PC})=0^-(1^{+-})$ and $0^+(1^{++})$.
The latter can be related to the $X(3872)$. In the isovector sector, a bound
state with $I^G(J^P)=1^+(1^+)$ is found with a large cutoff at about 3 GeV. If
a cutoff at about 2 GeV is adopted with which a pole carrying the quantum
number of the $X(3872)$ is produced at an energy of about 3871 MeV, the pole
for the bound state with $1^+(1^+)$ runs across the threshold to a second
Rienman sheet and becomes a resonance above the $D\bar{D}^*$ threshold, which
can be identified with the $Z_c(3900)$. With such a cutoff, the $D\bar{D}^{*}$
invariant mass spectrum is also investigated and the experimental results found
by BESIII can be reproduced.
| [
{
"created": "Wed, 20 May 2015 13:42:23 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Jul 2015 02:11:08 GMT",
"version": "v2"
},
{
"created": "Tue, 11 Aug 2015 06:28:05 GMT",
"version": "v3"
}
] | 2015-08-12 | [
[
"He",
"Jun",
""
]
] | In this paper it is proposed that the charged charmonium-like state $Z_c(3900)$ is a resonance above the threshold from the $D\bar{D}^*$ interaction. The $D\bar{D}^*$ interaction is described by the one-boson exchange model with light meson exchanges plus a short-range $J/\psi$ exchange. The scattering amplitude is calculated within a Bethe-Salpeter equation approach and the poles near the $D\bar{D}^*$ threshold are searched. In the isoscalar sector, two poles found under the $D\bar{D}^*$ threshold, i.e., bound states, have the quantum numbers $I^G(J^{PC})=0^-(1^{+-})$ and $0^+(1^{++})$. The latter can be related to the $X(3872)$. In the isovector sector, a bound state with $I^G(J^P)=1^+(1^+)$ is found with a large cutoff at about 3 GeV. If a cutoff at about 2 GeV is adopted with which a pole carrying the quantum number of the $X(3872)$ is produced at an energy of about 3871 MeV, the pole for the bound state with $1^+(1^+)$ runs across the threshold to a second Rienman sheet and becomes a resonance above the $D\bar{D}^*$ threshold, which can be identified with the $Z_c(3900)$. With such a cutoff, the $D\bar{D}^{*}$ invariant mass spectrum is also investigated and the experimental results found by BESIII can be reproduced. |
1002.2138 | Giovanni Salm\`e | T. Frederico (ITA - S. Jos\'e dos Santos), J. A. O. Marinho (ITA and
Coimbra Univ.), E. Pace (Rome Univ. "Tor Vergata" and INFN) and G. Salm\'e
(INFN - Rome) | Light-front projections of the Bethe-Salpeter amplitude and the 4D
electromagnetic current for an interacting two-fermion system | 8 pages, 1 Fig. Suitable. cls added. Proceedings of 12th Conference
on 'Theoretical Nuclear Physics in Italy', Cortona, October 2008 | Jou. of Phys. (Conference Series) 168 (2009) 012002 | 10.1088/1742-6596/168/1/012002 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A recent approach for constructing an exact 3D reduction of the 4D matrix
elements of the electromagnetic current for an interacting two-fermion system,
is briefly reviewed. The properties of the obtained 3D current, like the
fulfillment of the Ward-Takashi Identity and its Fock decomposition, will be
illustrated in relation with future applications to few-nucleon systems.
| [
{
"created": "Wed, 10 Feb 2010 17:04:01 GMT",
"version": "v1"
}
] | 2010-02-11 | [
[
"Frederico",
"T.",
"",
"ITA - S. José dos Santos"
],
[
"Marinho",
"J. A. O.",
"",
"ITA and\n Coimbra Univ."
],
[
"Pace",
"E.",
"",
"Rome Univ. \"Tor Vergata\" and INFN"
],
[
"Salmé",
"G.",
"",
"INFN - Rome"
]
] | A recent approach for constructing an exact 3D reduction of the 4D matrix elements of the electromagnetic current for an interacting two-fermion system, is briefly reviewed. The properties of the obtained 3D current, like the fulfillment of the Ward-Takashi Identity and its Fock decomposition, will be illustrated in relation with future applications to few-nucleon systems. |
1110.6516 | Dmitriy Pak | P. M. Zhang and D. G. Pak | On gauge invariant nucleon spin decomposition | 5 pages, final version accepted by EPJA | Eur. Phys. J. A (2012) 48: 91 | 10.1140/epja/i2012-12091-8 | null | hep-ph hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A non-uniqueness problem of gauge invariant separation of quark and gluon
contributions to nucleon spin is considered. We show that there is a wide
number of gauge invariant spin decompositions each of them reduces to the
canonical one in a special gauge. A class of physical gauge equivalent nucleon
spin decompositions is selected by requirements of consistence with helicity
notion described within E(2) little group representation theory and with gluon
helicity \Delta g measured in experiment.
| [
{
"created": "Sat, 29 Oct 2011 10:19:25 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Apr 2012 06:31:31 GMT",
"version": "v2"
},
{
"created": "Wed, 30 May 2012 08:10:16 GMT",
"version": "v3"
}
] | 2012-06-22 | [
[
"Zhang",
"P. M.",
""
],
[
"Pak",
"D. G.",
""
]
] | A non-uniqueness problem of gauge invariant separation of quark and gluon contributions to nucleon spin is considered. We show that there is a wide number of gauge invariant spin decompositions each of them reduces to the canonical one in a special gauge. A class of physical gauge equivalent nucleon spin decompositions is selected by requirements of consistence with helicity notion described within E(2) little group representation theory and with gluon helicity \Delta g measured in experiment. |
hep-ph/0412408 | Alexander Studenikin | Alexander Studenikin and Alexei Ternov | Neutrino quantum states and spin light in matter | 14 pages in LaTex, a modified version of hep-ph/0410297 (significant
part of the review matherial has been removed, the photon polarization has
been accounted for and discussion on the effect of different matter
compositions has been added), to be published in Phys.Lett.B | Phys.Lett. B608 (2005) 107-114 | 10.1016/j.physletb.2005.01.002 | null | hep-ph | null | On the basis of the exact solutions of the modified Dirac equation for a
massive neutrino moving in matter we develop the quantum theory of the spin
light of neutrino ($SL\nu$). The expression for the emitted photon energy is
derived as a function of the density of matter for different matter
compositions. The dependence of the photon energy on the helicities of the
initial and final neutrino states is shown explicitly. The rate and radiation
power of the $SL\nu$ in matter are obtained with the emitted photon linear and
circular polarizations being accounted for. The developed quantum approach to
the $SL\nu$ in matter (which is similar to the Furry representation of
electrodynamics) can be used in the studies of other processes with neutrinos
in the presence of matter
| [
{
"created": "Wed, 29 Dec 2004 13:55:49 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Studenikin",
"Alexander",
""
],
[
"Ternov",
"Alexei",
""
]
] | On the basis of the exact solutions of the modified Dirac equation for a massive neutrino moving in matter we develop the quantum theory of the spin light of neutrino ($SL\nu$). The expression for the emitted photon energy is derived as a function of the density of matter for different matter compositions. The dependence of the photon energy on the helicities of the initial and final neutrino states is shown explicitly. The rate and radiation power of the $SL\nu$ in matter are obtained with the emitted photon linear and circular polarizations being accounted for. The developed quantum approach to the $SL\nu$ in matter (which is similar to the Furry representation of electrodynamics) can be used in the studies of other processes with neutrinos in the presence of matter |
1307.4459 | Yu Shi | Zhijie Huang, Yu Shi | CP and CPT Violating Parameters Determined from the Joint Decays of
$C=+1$ Entangled Neutral Pseudoscalar Mesons | 22 pages, to appear in PRD | Phys. Rev. D 89, 016018 (2014) | 10.1103/PhysRevD.89.016018 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Entangled pseudoscalar neutral meson pairs have been used in studying CP
violation and searching CPT violation, but almost all the previous works
concern $C=-1$ entangled state. Here we consider $C=+1$ entangled state of
pseudoscalar neutral mesons, which is quite different from $C=-1$ entangled
state and provides complementary information on symmetry violating parameters.
After developing a general formalism, we consider three kinds of decay
processes, namely, semileptonic-semileptonic, hadronic-hadronic and
semileptonic-hadronic processes. For each kind of processes, we calculate the
integrated rates of joint decays with a fixed time interval, as well as
asymmetries defined for these joint rates of different channels. In turn, these
asymmetries can be used to determine the four real numbers of the two indirect
symmetry violating parameters, based on a general relation between the symmetry
violating parameters and the decay asymmetries presented here. Various
discussions are made on indirect and direct violations and the violation of
$\Delta {\cal F} =\Delta Q$ rule, with some results presented as theorems.
| [
{
"created": "Wed, 17 Jul 2013 00:28:17 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Jan 2014 12:59:41 GMT",
"version": "v2"
}
] | 2015-06-16 | [
[
"Huang",
"Zhijie",
""
],
[
"Shi",
"Yu",
""
]
] | Entangled pseudoscalar neutral meson pairs have been used in studying CP violation and searching CPT violation, but almost all the previous works concern $C=-1$ entangled state. Here we consider $C=+1$ entangled state of pseudoscalar neutral mesons, which is quite different from $C=-1$ entangled state and provides complementary information on symmetry violating parameters. After developing a general formalism, we consider three kinds of decay processes, namely, semileptonic-semileptonic, hadronic-hadronic and semileptonic-hadronic processes. For each kind of processes, we calculate the integrated rates of joint decays with a fixed time interval, as well as asymmetries defined for these joint rates of different channels. In turn, these asymmetries can be used to determine the four real numbers of the two indirect symmetry violating parameters, based on a general relation between the symmetry violating parameters and the decay asymmetries presented here. Various discussions are made on indirect and direct violations and the violation of $\Delta {\cal F} =\Delta Q$ rule, with some results presented as theorems. |
2212.06160 | P. S. Bhupal Dev | Yoav Afik, P. S. Bhupal Dev, Amarjit Soni, Fang Xu | Probing the muon (g-2) anomaly at the LHC in final states with two muons
and two taus | 13 pages, 5 figures; version to appear in Phys. Lett. B | null | 10.1016/j.physletb.2023.138032 | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | The longstanding muon $(g-2)$ anomaly, as well as the persistent hints of
lepton flavor universality violation in $B$-meson decays, could be signaling
new physics beyond the Standard Model (SM). A minimal $R$-parity-violating
supersymmetric framework with light third-generation sfermions (dubbed as
'RPV3') provides a compelling solution to these flavor anomalies, while
simultaneously addressing other pressing issues of the SM. We propose a new
RPV3 scenario for the solution of the muon $(g-2)$ anomaly, which leads to an
interesting LHC signal of $\mu^+\mu^-\tau^+\tau^-$ final state. We analyze the
Run-2 LHC multilepton data to derive stringent constraints on the sneutrino
mass and the relevant RPV coupling in this scenario. We then propose dedicated
selection strategies to improve the bound even with the existing dataset. We
also show that the high-luminosity LHC will completely cover the remaining muon
$(g-2)$-preferred parameter space, thus providing a robust, independent test of
the muon $(g-2)$ anomaly.
| [
{
"created": "Mon, 12 Dec 2022 19:00:01 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Jun 2023 09:39:48 GMT",
"version": "v2"
}
] | 2023-06-21 | [
[
"Afik",
"Yoav",
""
],
[
"Dev",
"P. S. Bhupal",
""
],
[
"Soni",
"Amarjit",
""
],
[
"Xu",
"Fang",
""
]
] | The longstanding muon $(g-2)$ anomaly, as well as the persistent hints of lepton flavor universality violation in $B$-meson decays, could be signaling new physics beyond the Standard Model (SM). A minimal $R$-parity-violating supersymmetric framework with light third-generation sfermions (dubbed as 'RPV3') provides a compelling solution to these flavor anomalies, while simultaneously addressing other pressing issues of the SM. We propose a new RPV3 scenario for the solution of the muon $(g-2)$ anomaly, which leads to an interesting LHC signal of $\mu^+\mu^-\tau^+\tau^-$ final state. We analyze the Run-2 LHC multilepton data to derive stringent constraints on the sneutrino mass and the relevant RPV coupling in this scenario. We then propose dedicated selection strategies to improve the bound even with the existing dataset. We also show that the high-luminosity LHC will completely cover the remaining muon $(g-2)$-preferred parameter space, thus providing a robust, independent test of the muon $(g-2)$ anomaly. |
2405.06733 | Andras Ster | T. Cs\"org\H{o}, T. Nov\'ak, R. Pasechnik, A. Ster, I. Szanyi | Model-independent Odderon results based on new TOTEM data on elastic pp
collisions at 8 TeV | 18 pages, 6 figures, presented at 52nd International Symposium on
Multiparticle Dynamics (ISMD 2023), Aug 21 - 26, 2023, MATE-KRC,
Gy\"ongy\"os, Hungary | Universe 2024, 10, 264 | 10.3390/universe10060264 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Evaluating the H(x, s; pp) scaling function of elastic proton-proton (pp)
collisions from recent TOTEM data at sqrt(s) = 8 TeV and comparing it with the
same function of elastic proton-antiproton (pp-) data of the D0 collaboration
at sqrt(s) = 1.96 TeV, we find, from this comparison alone, an at least 3.79
sigma {\signal} of Odderon exchange. If we combine this model independently
obtained result with that of a similar analysis but using TOTEM elastic pp
scattering data at sqrt(s) = 7 TeV, which resulted in an at least 6.26 {\sigma}
signal, the combined significance of Odderon exchange increases to at least
7.08 {\sigma}, model independently. Further combinations of various datasets in
the TeV energy range are detailed in the manuscript
| [
{
"created": "Fri, 10 May 2024 16:50:05 GMT",
"version": "v1"
},
{
"created": "Thu, 23 May 2024 17:38:51 GMT",
"version": "v2"
},
{
"created": "Wed, 26 Jun 2024 00:39:50 GMT",
"version": "v3"
}
] | 2024-06-27 | [
[
"Csörgő",
"T.",
""
],
[
"Novák",
"T.",
""
],
[
"Pasechnik",
"R.",
""
],
[
"Ster",
"A.",
""
],
[
"Szanyi",
"I.",
""
]
] | Evaluating the H(x, s; pp) scaling function of elastic proton-proton (pp) collisions from recent TOTEM data at sqrt(s) = 8 TeV and comparing it with the same function of elastic proton-antiproton (pp-) data of the D0 collaboration at sqrt(s) = 1.96 TeV, we find, from this comparison alone, an at least 3.79 sigma {\signal} of Odderon exchange. If we combine this model independently obtained result with that of a similar analysis but using TOTEM elastic pp scattering data at sqrt(s) = 7 TeV, which resulted in an at least 6.26 {\sigma} signal, the combined significance of Odderon exchange increases to at least 7.08 {\sigma}, model independently. Further combinations of various datasets in the TeV energy range are detailed in the manuscript |
1006.3624 | Vitaly Beylin | V. Beylin, V. Kuksa, and G. Vereshkov | The gauge model of quark-meson interactions and its application to the
meson radiative decays | 19 pages, 4 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | To analyze an electromagnetic and strong hadron processes at low energies, we
consider the renormalizable model with the U0(1) x U(1) x SU(2) gauge symmetry.
This approach is based on the linear sigma-model extended by the gauge and
quark-meson interactions. Physical content and parameters of the model are
discussed. Theoretical predictions for some radiative decays of vector mesons
are in a good agreement with the experimental data.
| [
{
"created": "Fri, 18 Jun 2010 07:54:00 GMT",
"version": "v1"
}
] | 2010-06-21 | [
[
"Beylin",
"V.",
""
],
[
"Kuksa",
"V.",
""
],
[
"Vereshkov",
"G.",
""
]
] | To analyze an electromagnetic and strong hadron processes at low energies, we consider the renormalizable model with the U0(1) x U(1) x SU(2) gauge symmetry. This approach is based on the linear sigma-model extended by the gauge and quark-meson interactions. Physical content and parameters of the model are discussed. Theoretical predictions for some radiative decays of vector mesons are in a good agreement with the experimental data. |
1107.0912 | Ruben Concei\c{c}\~ao | R. Concei\c{c}\~ao, J. Dias de Deus, M. Pimenta | Proton-proton cross-sections: the interplay between density and radius | null | null | 10.1016/j.nuclphysa.2012.02.019 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We argue that there are two mechanisms responsable for the growth of high
energy cross-sections - \sigma_{tot} and \sigma_{el}, say - in pp collisions.
One is by the increase of matter \emph{density}, resulting in the black disk
saturation. The other is by exclusively radial expansion affecting the
periphery of the overlap area. Within this simple model we can reproduce all
available data in pp from ISR to LHC. In order to achieve a fast growth in the
very high energy cosmic ray energies, we propose a fast black disk saturation
followed by the dominance of geometric scaling (GS).
| [
{
"created": "Tue, 5 Jul 2011 16:02:37 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Apr 2012 15:09:53 GMT",
"version": "v2"
}
] | 2015-05-28 | [
[
"Conceição",
"R.",
""
],
[
"de Deus",
"J. Dias",
""
],
[
"Pimenta",
"M.",
""
]
] | We argue that there are two mechanisms responsable for the growth of high energy cross-sections - \sigma_{tot} and \sigma_{el}, say - in pp collisions. One is by the increase of matter \emph{density}, resulting in the black disk saturation. The other is by exclusively radial expansion affecting the periphery of the overlap area. Within this simple model we can reproduce all available data in pp from ISR to LHC. In order to achieve a fast growth in the very high energy cosmic ray energies, we propose a fast black disk saturation followed by the dominance of geometric scaling (GS). |
2105.00435 | Sergio Scopetta | Sara Fucini, Mohammad Hattawy, Matteo Rinaldi and Sergio Scopetta | Deeply virtual Compton scattering off Helium nuclei with positron beams | 8 pages, 8 figures, invited article for the EPJA Topical Issue about
"Positron beams and physics at Jefferson Lab". arXiv admin note: substantial
text overlap with arXiv:2007.15081 | null | 10.1140/epja/s10050-021-00580-y | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Positron initiated deeply virtual Compton scattering (DVCS) off $^4$He and
$^3$He nuclei is described. The way the so-called $d-$term could be obtained
from the real part of the relevant Compton form factor is summarized, and the
importance and novelty of this measurement is discussed. The measurements
addressed for $^3$He targets could be very useful even in a standard
unpolarized target setup, measuring beam spin and beam charge asymmetries only.
The unpolarized beam charge asymmetries for DVCS off $^3$He and $^4$He are also
estimated, at JLab kinematics and, for $^4$He, also at a configuration typical
at the future Electron-Ion Collider. Incoherent DVCS processes, in particular
the ones with tagging the internal target by measuring slow recoiling nuclei,
and the unique possibility offered by positron beams for the investigation of
Compton form factors of higher twist, are also briefly addressed.
| [
{
"created": "Sun, 2 May 2021 09:56:59 GMT",
"version": "v1"
}
] | 2021-09-29 | [
[
"Fucini",
"Sara",
""
],
[
"Hattawy",
"Mohammad",
""
],
[
"Rinaldi",
"Matteo",
""
],
[
"Scopetta",
"Sergio",
""
]
] | Positron initiated deeply virtual Compton scattering (DVCS) off $^4$He and $^3$He nuclei is described. The way the so-called $d-$term could be obtained from the real part of the relevant Compton form factor is summarized, and the importance and novelty of this measurement is discussed. The measurements addressed for $^3$He targets could be very useful even in a standard unpolarized target setup, measuring beam spin and beam charge asymmetries only. The unpolarized beam charge asymmetries for DVCS off $^3$He and $^4$He are also estimated, at JLab kinematics and, for $^4$He, also at a configuration typical at the future Electron-Ion Collider. Incoherent DVCS processes, in particular the ones with tagging the internal target by measuring slow recoiling nuclei, and the unique possibility offered by positron beams for the investigation of Compton form factors of higher twist, are also briefly addressed. |
hep-ph/9912213 | Charles Gale | Charles Gale (1), Sangyong Jeon (2), Joseph Kapusta (3) ((1) McGill
University, (2) Lawrence Berkeley National Lab., (3) University of Minnesota) | Coherence Time Effects on J/psi Production and Suppression in
Relativistic Heavy Ion Collisions | 8 pages, 2 figures | Phys.Rev. C63 (2001) 024901 | 10.1103/PhysRevC.63.024901 | McGill/99-37, NUC-MINN-99/16-T | hep-ph nucl-th | null | Using a coherence time extracted from high precision proton-nucleus Drell-Yan
measurements and a nuclear absorption cross section extracted from pA
charmonium production experiments, we study J/psi production and absorption in
nucleus-nucleus collisions. We find that coherence time effects are large
enough to affect the measured J/psi-to-Drell-Yan ratio. The S+U data at 200A
GeV/c measured by NA38 are reproduced quantitatively without the introduction
of any new parameters. However, when compared with recent NA50 measurements for
Pb+Pb at 158A GeV/c, the data is not reproduced in trend or in magnitude.
| [
{
"created": "Wed, 1 Dec 1999 19:40:58 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Gale",
"Charles",
""
],
[
"Jeon",
"Sangyong",
""
],
[
"Kapusta",
"Joseph",
""
]
] | Using a coherence time extracted from high precision proton-nucleus Drell-Yan measurements and a nuclear absorption cross section extracted from pA charmonium production experiments, we study J/psi production and absorption in nucleus-nucleus collisions. We find that coherence time effects are large enough to affect the measured J/psi-to-Drell-Yan ratio. The S+U data at 200A GeV/c measured by NA38 are reproduced quantitatively without the introduction of any new parameters. However, when compared with recent NA50 measurements for Pb+Pb at 158A GeV/c, the data is not reproduced in trend or in magnitude. |
2209.00843 | Enrico Bothmann | Enrico Bothmann, Andy Buckley, Ilektra A. Christidi, Christian
G\"utschow, Stefan H\"oche, Max Knobbe, Tim Martin, Marek Sch\"onherr | Accelerating LHC event generation with simplified pilot runs and fast
PDFs | 21 pages, 7 figures, 1 table, 2 listings | null | 10.1140/epjc/s10052-022-11087-1 | FERMILAB-PUB-22-462-T, IPPP/22/39, MCnet-22-17 | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Poor computing efficiency of precision event generators for LHC physics has
become a bottleneck for Monte-Carlo event simulation campaigns. We provide
solutions to this problem by focusing on two major components of
general-purpose event generators: The PDF evaluator and the matrix-element
generator. For a typical production setup in the ATLAS experiment, we show that
the two can consume about 80% of the total runtime. Using NLO simulations of
$pp\to\ell^+\ell^-+\text{jets}$ and $pp\to t\bar{t}+\text{jets}$ as an example,
we demonstrate that the computing footprint of LHAPDF and Sherpa can be reduced
by factors of order 10, while maintaining the formal accuracy of the event
sample. The improved codes are made publicly available.
| [
{
"created": "Fri, 2 Sep 2022 07:00:55 GMT",
"version": "v1"
}
] | 2022-12-28 | [
[
"Bothmann",
"Enrico",
""
],
[
"Buckley",
"Andy",
""
],
[
"Christidi",
"Ilektra A.",
""
],
[
"Gütschow",
"Christian",
""
],
[
"Höche",
"Stefan",
""
],
[
"Knobbe",
"Max",
""
],
[
"Martin",
"Tim",
""
],
[
"Schönherr",
"Marek",
""
]
] | Poor computing efficiency of precision event generators for LHC physics has become a bottleneck for Monte-Carlo event simulation campaigns. We provide solutions to this problem by focusing on two major components of general-purpose event generators: The PDF evaluator and the matrix-element generator. For a typical production setup in the ATLAS experiment, we show that the two can consume about 80% of the total runtime. Using NLO simulations of $pp\to\ell^+\ell^-+\text{jets}$ and $pp\to t\bar{t}+\text{jets}$ as an example, we demonstrate that the computing footprint of LHAPDF and Sherpa can be reduced by factors of order 10, while maintaining the formal accuracy of the event sample. The improved codes are made publicly available. |
hep-ph/0703178 | William A. Bardeen | William A. Bardeen | Mesotron Decays and the Role of Anomalies | Talk presented at the 2006 International Symposium of the Jubilee of
the Sakata Model (pnL50). 10 pages | Prog.Theor.Phys.Suppl.167:44-52,2007 | 10.1143/PTPS.167.44 | FERMILAB-CONF-07-48-T | hep-ph | null | Puzzles associated with Yukawa's mesotron theory of nuclear interactions led
to the discovery of "anomalies" in quantum field theory. I will discuss some of
the remarkable consequences of these anomalies in the physics of elementary
particles.
| [
{
"created": "Fri, 16 Mar 2007 16:55:11 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Bardeen",
"William A.",
""
]
] | Puzzles associated with Yukawa's mesotron theory of nuclear interactions led to the discovery of "anomalies" in quantum field theory. I will discuss some of the remarkable consequences of these anomalies in the physics of elementary particles. |
2107.05971 | Marieke Postma | Marieke Postma | A different perspective on the vev insertion approximation for
electroweak baryogenesis | 17 pages, 1 figure. Published version | null | 10.1007/JHEP09(2021)055 | Nikhef-2021-016 | hep-ph | http://creativecommons.org/licenses/by/4.0/ | In the vev insertion approximation (VIA) the spacetime dependent part of the
mass matrix is treated as a perturbation. We calculate the source terms for
baryogenesis expanding both the self-energy and propagator to first order in
mass insertions, which gives the same results as the usual approach of
calculating the self-energy at second order and using zeroth order propagators.
This procedure shows explicitly the equivalence between including the mass in
the free or in the interaction Lagrangian. The VIA source then originates from
the same term in the kinetic equation as the semi-classical source, but at
leading order in the derivative expansion (the expansion in diamond operators).
On top, another type of derivative expansion is done, which we estimate to be
valid for a bubble width larger than the inverse thermal width. This cuts off
the divergence in the VIA source in the limit that the thermal width vanishes.
| [
{
"created": "Tue, 13 Jul 2021 10:38:04 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Jul 2021 16:30:10 GMT",
"version": "v2"
},
{
"created": "Fri, 10 Sep 2021 13:51:24 GMT",
"version": "v3"
}
] | 2021-09-29 | [
[
"Postma",
"Marieke",
""
]
] | In the vev insertion approximation (VIA) the spacetime dependent part of the mass matrix is treated as a perturbation. We calculate the source terms for baryogenesis expanding both the self-energy and propagator to first order in mass insertions, which gives the same results as the usual approach of calculating the self-energy at second order and using zeroth order propagators. This procedure shows explicitly the equivalence between including the mass in the free or in the interaction Lagrangian. The VIA source then originates from the same term in the kinetic equation as the semi-classical source, but at leading order in the derivative expansion (the expansion in diamond operators). On top, another type of derivative expansion is done, which we estimate to be valid for a bubble width larger than the inverse thermal width. This cuts off the divergence in the VIA source in the limit that the thermal width vanishes. |
1206.2172 | Pomita Ghoshal | Kalpana Bora, Debajyoti Dutta, Pomita Ghoshal | Probing Sterile Neutrino Parameters with Double Chooz, Daya Bay and RENO | 12 pages, 5 figures | JHEP 12 (2012) 025 | 10.1007/JHEP12(2012)025 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we present a realistic analysis of the potential of the
present-day reactor experiments Double Chooz, Daya Bay and RENO for probing the
existence of sterile neutrinos. We present exclusion regions for sterile
oscillation parameters for each of these experiments, using simulations with
realistic estimates of systematic errors and detector resolutions, and compare
the sterile parameter sensitivity regions we obtain with the existing bounds
from other reactor experiments. We find that these experimental set-ups give
significant bounds on the parameter \Theta_{ee} especially in the low sterile
oscillation region 0.01 < \Delta m_{41}^2 < 0.05 eV^2. These bounds can add to
our understanding of the sterile neutrino sector since there is still a tension
in the allowed regions from different experiments for sterile parameters.
| [
{
"created": "Mon, 11 Jun 2012 12:02:24 GMT",
"version": "v1"
},
{
"created": "Sat, 22 Dec 2012 11:38:34 GMT",
"version": "v2"
}
] | 2015-03-20 | [
[
"Bora",
"Kalpana",
""
],
[
"Dutta",
"Debajyoti",
""
],
[
"Ghoshal",
"Pomita",
""
]
] | In this work, we present a realistic analysis of the potential of the present-day reactor experiments Double Chooz, Daya Bay and RENO for probing the existence of sterile neutrinos. We present exclusion regions for sterile oscillation parameters for each of these experiments, using simulations with realistic estimates of systematic errors and detector resolutions, and compare the sterile parameter sensitivity regions we obtain with the existing bounds from other reactor experiments. We find that these experimental set-ups give significant bounds on the parameter \Theta_{ee} especially in the low sterile oscillation region 0.01 < \Delta m_{41}^2 < 0.05 eV^2. These bounds can add to our understanding of the sterile neutrino sector since there is still a tension in the allowed regions from different experiments for sterile parameters. |
hep-ph/0606114 | Kingman Cheung | Abdesslam Arhrib, Kingman Cheung, Tie-Jiun Hou, Kok-Wee Song | Associated production of a light pseudoscalar Higgs boson with a
chargino pair in the NMSSM | Revtex4, 13 pages including 4 figures. Improved analysis including
the opening angle distribution between the two photons from A1 decay | JHEP 0703:073,2007 | 10.1088/1126-6708/2007/03/073 | null | hep-ph | null | In the next-to-minimal supersymmetric standard model (NMSSM), the unique
$\lambda S H_u H_d$ in the superpotential gives rise to a coupling involving
the lighter pseudoscalar Higgs boson and a pair of charged or neutral
Higgsinos, even in the limit of zero mixing between the two pseudoscalar Higgs
bosons. We study the associated production of a very light pseudoscalar Higgs
boson with a pair of charginos. The novel signature involves a pair of charged
leptons from chargino decays and a pair of photons from the pseudoscalar Higgs
boson decay, plus large missing energy at the LHC and ILC. The signal may help
us to distinguish the NMSSM from MSSM, provided that the experiment can resolve
the two photons from the decay of the pseudoscalar Higgs boson.
| [
{
"created": "Fri, 9 Jun 2006 16:58:51 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Aug 2006 14:42:03 GMT",
"version": "v2"
},
{
"created": "Wed, 8 Nov 2006 00:30:10 GMT",
"version": "v3"
}
] | 2010-10-27 | [
[
"Arhrib",
"Abdesslam",
""
],
[
"Cheung",
"Kingman",
""
],
[
"Hou",
"Tie-Jiun",
""
],
[
"Song",
"Kok-Wee",
""
]
] | In the next-to-minimal supersymmetric standard model (NMSSM), the unique $\lambda S H_u H_d$ in the superpotential gives rise to a coupling involving the lighter pseudoscalar Higgs boson and a pair of charged or neutral Higgsinos, even in the limit of zero mixing between the two pseudoscalar Higgs bosons. We study the associated production of a very light pseudoscalar Higgs boson with a pair of charginos. The novel signature involves a pair of charged leptons from chargino decays and a pair of photons from the pseudoscalar Higgs boson decay, plus large missing energy at the LHC and ILC. The signal may help us to distinguish the NMSSM from MSSM, provided that the experiment can resolve the two photons from the decay of the pseudoscalar Higgs boson. |
2303.03184 | Qi Wang | Qi Wang, Fu-Hu Liu, Khusniddin K. Olimov | Excitation functions of related temperatures of {\eta} and {\eta}0
emission sources from squared momentum transfer spectra in high-energy
collisions | 13 pages, 3 figures | Universe 2023, 9(7), 342 | 10.3390/universe9070342 | null | hep-ph nucl-th | http://creativecommons.org/publicdomain/zero/1.0/ | The squared momentum transfer spectra of $\eta$ and $\eta ^0$, produced in
high-energy photon-proton ($\gamma p$) $\rightarrow \eta(\eta^0)+p$ processes
in electron-proton ($ep$) collisions performed at CEBAF, NINA, CEA, SLAC, DESY,
and WLS are analyzed. The Monte Carlo calculations are used in the analysis of
the squared momentum transfer spectra, where the transfer undergoes from the
incident $\gamma$ to emitted $\eta(\eta^0)$ or equivalently from the target
proton to emitted proton. In the calculations, the Erlang distribution and
Tsallis-Levy function are used to describe the transverse momentum ($p_T$)
spectra of emitted particles. Our results show that the average transverse
momentum ($\langle p_T\rangle$), the initial-state temperature ($T_i$), and the
final-state temperature ($T_0$) roughly decrease from the lower center-of-mass
energy ($W$) to the higher one in the concerned energy range of a few GeV,
which is different from the excitation function from heavy-ion collisions in
the similar energy range.
| [
{
"created": "Thu, 2 Mar 2023 09:08:06 GMT",
"version": "v1"
},
{
"created": "Sat, 29 Jul 2023 10:16:20 GMT",
"version": "v2"
}
] | 2023-08-01 | [
[
"Wang",
"Qi",
""
],
[
"Liu",
"Fu-Hu",
""
],
[
"Olimov",
"Khusniddin K.",
""
]
] | The squared momentum transfer spectra of $\eta$ and $\eta ^0$, produced in high-energy photon-proton ($\gamma p$) $\rightarrow \eta(\eta^0)+p$ processes in electron-proton ($ep$) collisions performed at CEBAF, NINA, CEA, SLAC, DESY, and WLS are analyzed. The Monte Carlo calculations are used in the analysis of the squared momentum transfer spectra, where the transfer undergoes from the incident $\gamma$ to emitted $\eta(\eta^0)$ or equivalently from the target proton to emitted proton. In the calculations, the Erlang distribution and Tsallis-Levy function are used to describe the transverse momentum ($p_T$) spectra of emitted particles. Our results show that the average transverse momentum ($\langle p_T\rangle$), the initial-state temperature ($T_i$), and the final-state temperature ($T_0$) roughly decrease from the lower center-of-mass energy ($W$) to the higher one in the concerned energy range of a few GeV, which is different from the excitation function from heavy-ion collisions in the similar energy range. |
hep-ph/9712497 | Alexey A. Petrov | Alexey A. Petrov | Intrinsic charm of light mesons and CP violation in heavy quark decay | 17 pages, RevTex, 1 table, 2 figures | Phys. Rev. D 58, 054004 (1998) | 10.1103/PhysRevD.58.054004 | JHU-TIPAC-97016, UMHEP-446 | hep-ph | null | We investigate the impact of the intrinsic heavy quark states on the
predicted values of CP asymmetries in the decays of heavy mesons. It is shown
that the intrinsic charm contribution, although dynamically suppressed in QCD,
is favored by the weak interaction, and therefore it can significantly dilute
the predicted values of CP-violating asymmetries. This introduces additional
non-perturbative uncertainty into the estimate of direct CP violating effects.
We provide a phenomenological estimate of intrinsic charm content of eta and
eta' mesons by expanding various amplitudes in terms of the heavy-light quark
mixing angle and discuss theoretical uncertainties in the estimates of direct
CP-violating asymmetries in B -> eta^(') K^(*).
| [
{
"created": "Mon, 22 Dec 1997 22:58:00 GMT",
"version": "v1"
}
] | 2016-08-25 | [
[
"Petrov",
"Alexey A.",
""
]
] | We investigate the impact of the intrinsic heavy quark states on the predicted values of CP asymmetries in the decays of heavy mesons. It is shown that the intrinsic charm contribution, although dynamically suppressed in QCD, is favored by the weak interaction, and therefore it can significantly dilute the predicted values of CP-violating asymmetries. This introduces additional non-perturbative uncertainty into the estimate of direct CP violating effects. We provide a phenomenological estimate of intrinsic charm content of eta and eta' mesons by expanding various amplitudes in terms of the heavy-light quark mixing angle and discuss theoretical uncertainties in the estimates of direct CP-violating asymmetries in B -> eta^(') K^(*). |
1411.3653 | Yachao Qian | Yachao Qian and Ismail Zahed | Stretched String with Self-Interaction at High Resolution: Spatial Sizes
and Saturation | 25 pages, 28 figures | Phys. Rev. D 91, 125032 (2015) | 10.1103/PhysRevD.91.125032 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We model the (holographic) QCD Pomeron as a long and stretched (fixed impact
parameter) transverse quantum string in flat $D_\perp=3$ dimensions. After
discretizing the string in $N$ string bits, we analyze its length, mass and
spatial distribution for large $N$ or low-x ($x=1/N$), and away from its
Hagedorn point. The string bit distribution shows sizable asymmetries in the
transverse plane that may translate to azimuthal asymmetries in primordial
particle production in the Pomeron kinematics, and the flow moments in minimum
bias $pp$ and $pA$ events. At moderately low-x and relatively small string
self-interactions $g_s\approx \alpha_s$ (the gauge coupling), a pre-saturation
phase is identified whereby the string transverse area undergoes a sharp
transition from a large diffusive growth to a small fixed size area set by few
string lengths $l_s$. For lower values of $x$ the transverse string bit density
is shown to increase as $1/x$ before saturating at the Bekenstein bound of one
bit per Planck area with the Planck length $l_P/l_s\approx \alpha_s^{2/3}$. We
argue that the effects of the AdS$_5$ curvature on the interacting string maybe
estimated using an effective transverse dimension between the interacting
string bits. The result is a smoother transition with a transverse string bit
density increasing as $1/x^{0.31}$.
| [
{
"created": "Thu, 13 Nov 2014 18:33:15 GMT",
"version": "v1"
},
{
"created": "Fri, 20 Mar 2015 18:15:50 GMT",
"version": "v2"
}
] | 2021-02-12 | [
[
"Qian",
"Yachao",
""
],
[
"Zahed",
"Ismail",
""
]
] | We model the (holographic) QCD Pomeron as a long and stretched (fixed impact parameter) transverse quantum string in flat $D_\perp=3$ dimensions. After discretizing the string in $N$ string bits, we analyze its length, mass and spatial distribution for large $N$ or low-x ($x=1/N$), and away from its Hagedorn point. The string bit distribution shows sizable asymmetries in the transverse plane that may translate to azimuthal asymmetries in primordial particle production in the Pomeron kinematics, and the flow moments in minimum bias $pp$ and $pA$ events. At moderately low-x and relatively small string self-interactions $g_s\approx \alpha_s$ (the gauge coupling), a pre-saturation phase is identified whereby the string transverse area undergoes a sharp transition from a large diffusive growth to a small fixed size area set by few string lengths $l_s$. For lower values of $x$ the transverse string bit density is shown to increase as $1/x$ before saturating at the Bekenstein bound of one bit per Planck area with the Planck length $l_P/l_s\approx \alpha_s^{2/3}$. We argue that the effects of the AdS$_5$ curvature on the interacting string maybe estimated using an effective transverse dimension between the interacting string bits. The result is a smoother transition with a transverse string bit density increasing as $1/x^{0.31}$. |
1401.6616 | Zhengcheng Gu | Zheng-Cheng Gu and John Preskill | A universal form for quark and neutrino mass matrices | 4.5 pages, 2 figures, added references, added more discussions for
$\theta_{13}$ angle | Phys. Rev. D 92, 113005 (2015) | 10.1103/PhysRevD.92.113005 | CALT 68-2882 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a universal form for quark and lepton mass matrices, which applies
in a ``leading order'' approximation where $CP$-violating phases are ignored.
Down-quark mass ratios are successfully predicted in our scheme using the
measured CKM mixing angles as input. Assuming an additional discrete symmetry
in the neutrino sector, we obtain the ``golden ratio'' pattern in the
leading-order PMNS mixing matrix; in addition we predict an inverted neutrino
mass hierarchy with $m_1\simeq m_2 \simeq74 meV$, $m_3\simeq 55 meV$, and
neutrinoless double beta decay mass parameter $m_{0\nu\beta\beta}\simeq 33~
meV$. We also predict that the $CP$-violating angle in the neutrino sector is
close to the maximal value $\delta=\pm\pi/2$, and that the diagonal phases in
the PMNS matrix are $\alpha_1\simeq 0$, $\alpha_2\simeq\pi$.
| [
{
"created": "Sun, 26 Jan 2014 06:02:37 GMT",
"version": "v1"
},
{
"created": "Sat, 22 Feb 2014 18:30:25 GMT",
"version": "v2"
}
] | 2015-12-09 | [
[
"Gu",
"Zheng-Cheng",
""
],
[
"Preskill",
"John",
""
]
] | We propose a universal form for quark and lepton mass matrices, which applies in a ``leading order'' approximation where $CP$-violating phases are ignored. Down-quark mass ratios are successfully predicted in our scheme using the measured CKM mixing angles as input. Assuming an additional discrete symmetry in the neutrino sector, we obtain the ``golden ratio'' pattern in the leading-order PMNS mixing matrix; in addition we predict an inverted neutrino mass hierarchy with $m_1\simeq m_2 \simeq74 meV$, $m_3\simeq 55 meV$, and neutrinoless double beta decay mass parameter $m_{0\nu\beta\beta}\simeq 33~ meV$. We also predict that the $CP$-violating angle in the neutrino sector is close to the maximal value $\delta=\pm\pi/2$, and that the diagonal phases in the PMNS matrix are $\alpha_1\simeq 0$, $\alpha_2\simeq\pi$. |
2403.02323 | Ian Nugent Dr. | Ian M. Nugent | ee$\in$MC: Comments on Asymmetries in QED | 4 pages, 1 Figure | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the Quantum Electrodynamics process $e^{+}e^{-}\to l^{+}l^{-}(n\gamma)$,
there are two well known angular asymmetries in the $cos(\theta)$ and the
$cos(\theta^{*})$ distributions. In this paper, the QED angular asymmetry
related to the $cos(\theta^{*})$ distribution is investigated in terms of the
Dirac propagator and the associated boundary conditions from which the Dirac
propagator is constructed and the potential implications are examined.
| [
{
"created": "Mon, 4 Mar 2024 18:55:16 GMT",
"version": "v1"
}
] | 2024-03-05 | [
[
"Nugent",
"Ian M.",
""
]
] | In the Quantum Electrodynamics process $e^{+}e^{-}\to l^{+}l^{-}(n\gamma)$, there are two well known angular asymmetries in the $cos(\theta)$ and the $cos(\theta^{*})$ distributions. In this paper, the QED angular asymmetry related to the $cos(\theta^{*})$ distribution is investigated in terms of the Dirac propagator and the associated boundary conditions from which the Dirac propagator is constructed and the potential implications are examined. |
1806.05058 | Deepak Tiwari | Deepak Tiwari, Sandhya Choubey and Anushree Ghosh | Prospects of indirect searches for dark matter annihilations in the
earth with ICAL@INO | 20 pages, 1 table and 11 figures | null | 10.1007/JHEP05(2019)039 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the prospects of detecting muon events at the upcoming Iron
CALorimeter (ICAL) detector to be built at the proposed India-based Neutrino
Observatory (INO) facility due to neutrinos arising out of annihilation of
Weakly Interactive Massive Particles (WIMP) in the centre of the earth. The
atmospheric neutrinos coming from the direction of earth core presents an
irreducible background. We consider 50kt $\times$ 10 years of ICAL running and
WIMP masses between 10-100 GeV and present 90 \% C.L. exclusion sensitivity
limits on $\sigma_{SI}$ which is the WIMP-nucleon Spin Independent (SI)
interaction cross-section. The expected sensitivity limits calculated for ICAL
for the WIMP annihilation in the earth are more stringent than the limits
obtained by any other indirect detection experiment. For a WIMP mass of ~$52.14
\textup{ GeV}$, where the signal fluxes are enhanced due to resonance capture
of WIMP in earth due to Fe nuclei, the sensitivity limits, assuming 100\%
branching ratio for each channel, are : $\sigma_{SI} =1.02\times 10^{-44}~cm^2$
for the $\tau^{+} \tau^{-}$ channel and $\sigma_{SI} =5.36\times 10^{-44}
~cm^2$ for the $b ~\bar{b}$ channel.
| [
{
"created": "Wed, 13 Jun 2018 14:10:44 GMT",
"version": "v1"
}
] | 2019-05-22 | [
[
"Tiwari",
"Deepak",
""
],
[
"Choubey",
"Sandhya",
""
],
[
"Ghosh",
"Anushree",
""
]
] | We study the prospects of detecting muon events at the upcoming Iron CALorimeter (ICAL) detector to be built at the proposed India-based Neutrino Observatory (INO) facility due to neutrinos arising out of annihilation of Weakly Interactive Massive Particles (WIMP) in the centre of the earth. The atmospheric neutrinos coming from the direction of earth core presents an irreducible background. We consider 50kt $\times$ 10 years of ICAL running and WIMP masses between 10-100 GeV and present 90 \% C.L. exclusion sensitivity limits on $\sigma_{SI}$ which is the WIMP-nucleon Spin Independent (SI) interaction cross-section. The expected sensitivity limits calculated for ICAL for the WIMP annihilation in the earth are more stringent than the limits obtained by any other indirect detection experiment. For a WIMP mass of ~$52.14 \textup{ GeV}$, where the signal fluxes are enhanced due to resonance capture of WIMP in earth due to Fe nuclei, the sensitivity limits, assuming 100\% branching ratio for each channel, are : $\sigma_{SI} =1.02\times 10^{-44}~cm^2$ for the $\tau^{+} \tau^{-}$ channel and $\sigma_{SI} =5.36\times 10^{-44} ~cm^2$ for the $b ~\bar{b}$ channel. |
2303.16681 | Erik Bartos | Erik Barto\v{s}, Stanislav Dubni\v{c}ka, Anna Zuzana Dubni\v{c}kov\'a | Search for damped oscillating structures from charged pion
electromagnetic form factor data | 21 pages, 4 tables, 11 figures | Dynamics 3(1) (2023) 137-151 | 10.3390/dynamics3010009 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The damped oscillating structures recently revealed by a three parametric
formula from the proton ``effective'' form factor data extracted of the
measured total cross section $\sigma^{bare}_{tot}(e^+e^-\to p\bar p)$ still
seem to have an unknown origin. The conjectures of their direct manifestation
of the quark-gluon structure of the proton indicate that they are not specific
only of the proton and neutron, but they have to be one's own, similar to other
hadrons.
Therefore, the oscillatory structures from the charged pion electromagnetic
form factor timelike data, extracted of the process $e^+e^-\to \pi^+ \pi^-$ are
investigated by using the same procedure as in the case of the proton.
The analysis shows the appearance of the oscillating structures in the
description of the charged pion electromagnetic form factor timelike data by
three parametric formula with a rather large value of $\chi^2/ndf$, while the
description of the data by the physically well-founded Unitary and Analytic
model has not revealed any damped oscillating structures.
From the obtained result on the most simple object of strong interactions,
one can conclude that damped oscillating structures received from the
``effective'' proton form factor data are probably generated by a utilization
of the improper three parametric formula which does not describe these data
with sufficient precision.
| [
{
"created": "Tue, 28 Mar 2023 10:42:41 GMT",
"version": "v1"
}
] | 2023-03-30 | [
[
"Bartoš",
"Erik",
""
],
[
"Dubnička",
"Stanislav",
""
],
[
"Dubničková",
"Anna Zuzana",
""
]
] | The damped oscillating structures recently revealed by a three parametric formula from the proton ``effective'' form factor data extracted of the measured total cross section $\sigma^{bare}_{tot}(e^+e^-\to p\bar p)$ still seem to have an unknown origin. The conjectures of their direct manifestation of the quark-gluon structure of the proton indicate that they are not specific only of the proton and neutron, but they have to be one's own, similar to other hadrons. Therefore, the oscillatory structures from the charged pion electromagnetic form factor timelike data, extracted of the process $e^+e^-\to \pi^+ \pi^-$ are investigated by using the same procedure as in the case of the proton. The analysis shows the appearance of the oscillating structures in the description of the charged pion electromagnetic form factor timelike data by three parametric formula with a rather large value of $\chi^2/ndf$, while the description of the data by the physically well-founded Unitary and Analytic model has not revealed any damped oscillating structures. From the obtained result on the most simple object of strong interactions, one can conclude that damped oscillating structures received from the ``effective'' proton form factor data are probably generated by a utilization of the improper three parametric formula which does not describe these data with sufficient precision. |
1812.09931 | Xiu-Lei Ren | Xiu-Lei Ren, Zhi-Feng Sun | Possible bound states with hidden bottom from
$\bar{K}^{(*)}B^{(*)}\bar{B}^{(*)}$ systems | Version to be published in Phys. Rev. D | Phys. Rev. D 99, 094041 (2019) | 10.1103/PhysRevD.99.094041 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the three-body systems of $\bar{K}^{(*)}B^{(*)}\bar{B}^{(*)}$ by
solving the Faddeev equations in the fixed-center approximation, where the
light particle $\bar{K}^{(*)}$ interacts with the heavy bound states of
$B\bar{B}$ ($B^*\bar{B}^*$) forming the clusters. In terms of the very
attractive $\bar{K}^*B$ and $\bar{K}^*B^*$ subsystems, which are constrained by
the observed $B_{s1}(5830)$ and $B_{s2}^*(5840)$ states in experiment, we find
two deep bound states, containing the hidden-bottom components, with masses
$11002\pm 63$ MeV and $11078\pm 57$ MeV in the $\bar{K}^*B\bar{B}$ and
$\bar{K}^*B^*\bar{B}^*$ systems, respectively. The two corresponding states
with higher masses of the above systems are also predicted. In addition, using
the constrained two-body amplitudes of $\bar{K}B^{(*)}$ and
$\bar{K}\bar{B}^{(*)}$ via the hidden gauge symmetry in the heavy-quark sector,
we also find two three-body $\bar{K}B\bar{B}$ and $\bar{K}B^{*}\bar{B}^*$ bound
states.
| [
{
"created": "Mon, 24 Dec 2018 14:52:45 GMT",
"version": "v1"
},
{
"created": "Mon, 27 May 2019 07:47:07 GMT",
"version": "v2"
}
] | 2019-06-05 | [
[
"Ren",
"Xiu-Lei",
""
],
[
"Sun",
"Zhi-Feng",
""
]
] | We study the three-body systems of $\bar{K}^{(*)}B^{(*)}\bar{B}^{(*)}$ by solving the Faddeev equations in the fixed-center approximation, where the light particle $\bar{K}^{(*)}$ interacts with the heavy bound states of $B\bar{B}$ ($B^*\bar{B}^*$) forming the clusters. In terms of the very attractive $\bar{K}^*B$ and $\bar{K}^*B^*$ subsystems, which are constrained by the observed $B_{s1}(5830)$ and $B_{s2}^*(5840)$ states in experiment, we find two deep bound states, containing the hidden-bottom components, with masses $11002\pm 63$ MeV and $11078\pm 57$ MeV in the $\bar{K}^*B\bar{B}$ and $\bar{K}^*B^*\bar{B}^*$ systems, respectively. The two corresponding states with higher masses of the above systems are also predicted. In addition, using the constrained two-body amplitudes of $\bar{K}B^{(*)}$ and $\bar{K}\bar{B}^{(*)}$ via the hidden gauge symmetry in the heavy-quark sector, we also find two three-body $\bar{K}B\bar{B}$ and $\bar{K}B^{*}\bar{B}^*$ bound states. |
0801.4869 | Kyrill Bugaev | K. A. Bugaev, V. K. Petrov and G. M. Zinovjev | Why Don't We See the Hagedorn Mass Spectrum in the Experiments? | 7 pages, 1 figure added, one chaper added, more references included | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The influence of medium dependent finite width of the QGP bags on their
equation of state is analyzed on a basis of an exactly solvable model with the
general mass-volume spectrum of these bags. It is arguing that the consistent
statistical description of the QGP bags is achieved for the width proportional
to the square root of their volume. The model allows us to estimate the minimal
value of the QGP bags' width from the new lattice QCD data. The large width of
the QGP bags not only explains the observed deficit in the number of hadronic
resonances compared to the Hagedorn mass spectrum, but also clarifies the
reason why the heavy/ large QGP bags cannot be directly observed in experiments
as metastable states in a hadronic phase.
| [
{
"created": "Thu, 31 Jan 2008 13:52:49 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Dec 2008 16:30:47 GMT",
"version": "v2"
}
] | 2008-12-11 | [
[
"Bugaev",
"K. A.",
""
],
[
"Petrov",
"V. K.",
""
],
[
"Zinovjev",
"G. M.",
""
]
] | The influence of medium dependent finite width of the QGP bags on their equation of state is analyzed on a basis of an exactly solvable model with the general mass-volume spectrum of these bags. It is arguing that the consistent statistical description of the QGP bags is achieved for the width proportional to the square root of their volume. The model allows us to estimate the minimal value of the QGP bags' width from the new lattice QCD data. The large width of the QGP bags not only explains the observed deficit in the number of hadronic resonances compared to the Hagedorn mass spectrum, but also clarifies the reason why the heavy/ large QGP bags cannot be directly observed in experiments as metastable states in a hadronic phase. |
1001.3467 | Azad Inshalla oglu Ahmadov | A. I. Ahmadov, E. A. Kuraev, Yu. M. Bystritskiy | Two-pion production in electron-polarized proton scattering | 18 pages, 3 figures, 2 tables | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The process of two pion production in the electron-polarized proton
scattering is investigated. In the Weizs\"acker-Williams approximation the
differential spectral distributions and the spin-momentum correlations are
considered. The spin correlation effects caused by $\rho$-meson widths are
estimated to be of an order of several per cent. Both channels of the
$\pi^+\pi^-$ and $\pi^+\pi^0$ creation are considered. The effects of
intermediate excited baryons are not considered. The spectral distributions on
pion energy fractions in polarized and unpolarized cases are presented
analytically and numerically.
| [
{
"created": "Wed, 20 Jan 2010 06:25:48 GMT",
"version": "v1"
},
{
"created": "Sat, 30 Mar 2013 11:48:02 GMT",
"version": "v2"
}
] | 2013-04-02 | [
[
"Ahmadov",
"A. I.",
""
],
[
"Kuraev",
"E. A.",
""
],
[
"Bystritskiy",
"Yu. M.",
""
]
] | The process of two pion production in the electron-polarized proton scattering is investigated. In the Weizs\"acker-Williams approximation the differential spectral distributions and the spin-momentum correlations are considered. The spin correlation effects caused by $\rho$-meson widths are estimated to be of an order of several per cent. Both channels of the $\pi^+\pi^-$ and $\pi^+\pi^0$ creation are considered. The effects of intermediate excited baryons are not considered. The spectral distributions on pion energy fractions in polarized and unpolarized cases are presented analytically and numerically. |
hep-ph/0309105 | Kuang-Ta Chao | Zhong-Zhi Song, Ce Meng, Ying-Jia Gao, Kuang-Ta Chao | Infrared divergences of $B$ meson exclusive decays to P-wave charmonia
in QCD factorization and nonrelativistic QCD | 4 pages, revtex, 1 figure | Phys.Rev. D69 (2004) 054009 | 10.1103/PhysRevD.69.054009 | null | hep-ph | null | In the framework of QCD factorization, we study the $B$ meson exclusive
decays $B\to \chi_{cJ}K$ where the spin-triplet P-wave charmonium states
$\chi_{cJ}(J=0,1,2)$ are described by the color-singlet non-relativistic wave
functions. We find that for these decays (except $\chi_{c1}$) there are
infrared divergences arising from nonfactorizable vertex corrections as well as
logarithmic end-point singularities arising from nonfactorizable spectator
interactions at leading-twist order. The infrared divergences due to vertex
corrections will explicitly break down QCD factorization within the
color-singlet model for charmonia. Unlike in the inclusive decays where the
higher Fock states with color-octet $c \bar c$ pair and soft gluon can make
contributions to remove the infrared divergences, their contributions can not
be accommodated in the exclusive two body decays. As a result, the infrared
divergences encountered in exclusive processes involving charmonia may raise a
new question to the QCD factorization and NRQCD factorization in B exclusive
decays.
| [
{
"created": "Wed, 10 Sep 2003 03:49:26 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Song",
"Zhong-Zhi",
""
],
[
"Meng",
"Ce",
""
],
[
"Gao",
"Ying-Jia",
""
],
[
"Chao",
"Kuang-Ta",
""
]
] | In the framework of QCD factorization, we study the $B$ meson exclusive decays $B\to \chi_{cJ}K$ where the spin-triplet P-wave charmonium states $\chi_{cJ}(J=0,1,2)$ are described by the color-singlet non-relativistic wave functions. We find that for these decays (except $\chi_{c1}$) there are infrared divergences arising from nonfactorizable vertex corrections as well as logarithmic end-point singularities arising from nonfactorizable spectator interactions at leading-twist order. The infrared divergences due to vertex corrections will explicitly break down QCD factorization within the color-singlet model for charmonia. Unlike in the inclusive decays where the higher Fock states with color-octet $c \bar c$ pair and soft gluon can make contributions to remove the infrared divergences, their contributions can not be accommodated in the exclusive two body decays. As a result, the infrared divergences encountered in exclusive processes involving charmonia may raise a new question to the QCD factorization and NRQCD factorization in B exclusive decays. |
1601.08193 | Eleni Vryonidou | Olga Bessidskaia Bylund, Fabio Maltoni, Ioannis Tsinikos, Eleni
Vryonidou and Cen Zhang | Probing top quark neutral couplings in the Standard Model Effective
Field Theory at NLO QCD | 37 pages, 18 figures | null | null | CP3-16-03, MCnet-16-03 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Top quark pair production in association with a $Z$-boson or a photon at the
LHC directly probes neutral top-quark couplings. We present predictions for
these two processes in the Standard Model (SM) Effective Field Theory (EFT) at
next-to-leading (NLO) order in QCD. We include the full set of CP-even
dimension-six operators that enter the top-quark interactions with the SM gauge
bosons. For comparison, we also present predictions in the SMEFT for top
loop-induced $HZ$ production at the LHC and for $t\bar{t}$ production at the
ILC at NLO in QCD. Results for total cross sections and differential
distributions are obtained and uncertainties coming from missing higher orders
in the strong coupling and in the EFT expansions are discussed. NLO results
matched to the parton shower are available, allowing for event generation to be
directly employed in an experimental analyses. Our framework provides a solid
basis for the interpretation of current and future measurements in the SMEFT,
with improved accuracy and precision.
| [
{
"created": "Fri, 29 Jan 2016 16:54:31 GMT",
"version": "v1"
}
] | 2016-02-01 | [
[
"Bylund",
"Olga Bessidskaia",
""
],
[
"Maltoni",
"Fabio",
""
],
[
"Tsinikos",
"Ioannis",
""
],
[
"Vryonidou",
"Eleni",
""
],
[
"Zhang",
"Cen",
""
]
] | Top quark pair production in association with a $Z$-boson or a photon at the LHC directly probes neutral top-quark couplings. We present predictions for these two processes in the Standard Model (SM) Effective Field Theory (EFT) at next-to-leading (NLO) order in QCD. We include the full set of CP-even dimension-six operators that enter the top-quark interactions with the SM gauge bosons. For comparison, we also present predictions in the SMEFT for top loop-induced $HZ$ production at the LHC and for $t\bar{t}$ production at the ILC at NLO in QCD. Results for total cross sections and differential distributions are obtained and uncertainties coming from missing higher orders in the strong coupling and in the EFT expansions are discussed. NLO results matched to the parton shower are available, allowing for event generation to be directly employed in an experimental analyses. Our framework provides a solid basis for the interpretation of current and future measurements in the SMEFT, with improved accuracy and precision. |
1606.04445 | Nicolao Fornengo | M. Re Fiorentin, V. Niro, N. Fornengo | A consistent model for leptogenesis, dark matter and the IceCube signal | 19 pages, 4 figures. Constraints from cosmic-ray antiprotons and
gamma rays added, with hadrophobic assignment of the matter multiplets to
satisfy bounds. References added. Matches version published in JHEP | JHEP 1611 (2016) 022 | 10.1007/JHEP11(2016)022 | FTUAM-16-22, IFT-UAM/CSIC-16-055 | hep-ph astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss a left-right symmetric extension of the Standard Model in which
the three additional right-handed neutrinos play a central role in explaining
the baryon asymmetry of the Universe, the dark matter abundance and the ultra
energetic signal detected by the IceCube experiment. The energy spectrum and
neutrino flux measured by IceCube are ascribed to the decays of the lightest
right-handed neutrino $N_1$, thus fixing its mass and lifetime, while the
production of $N_1$ in the primordial thermal bath occurs via a freeze-in
mechanism driven by the additional $SU(2)_R$ interactions. The constraints
imposed by IceCube and the dark matter abundance allow nonetheless the heavier
right-handed neutrinos to realize a standard type-I seesaw leptogenesis, with
the $B-L$ asymmetry dominantly produced by the next-to-lightest neutrino $N_2$.
Further consequences and predictions of the model are that: the $N_1$
production implies a specific power-law relation between the reheating
temperature of the Universe and the vacuum expectation value of the $SU(2)_R$
triplet; leptogenesis imposes a lower bound on the reheating temperature of the
Universe at $7\times10^9\,\mbox{GeV}$. Additionally, the model requires a
vanishing absolute neutrino mass scale $m_1\simeq0$.
| [
{
"created": "Tue, 14 Jun 2016 16:32:36 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Jul 2016 16:40:29 GMT",
"version": "v2"
},
{
"created": "Thu, 17 Nov 2016 09:06:19 GMT",
"version": "v3"
}
] | 2016-11-18 | [
[
"Fiorentin",
"M. Re",
""
],
[
"Niro",
"V.",
""
],
[
"Fornengo",
"N.",
""
]
] | We discuss a left-right symmetric extension of the Standard Model in which the three additional right-handed neutrinos play a central role in explaining the baryon asymmetry of the Universe, the dark matter abundance and the ultra energetic signal detected by the IceCube experiment. The energy spectrum and neutrino flux measured by IceCube are ascribed to the decays of the lightest right-handed neutrino $N_1$, thus fixing its mass and lifetime, while the production of $N_1$ in the primordial thermal bath occurs via a freeze-in mechanism driven by the additional $SU(2)_R$ interactions. The constraints imposed by IceCube and the dark matter abundance allow nonetheless the heavier right-handed neutrinos to realize a standard type-I seesaw leptogenesis, with the $B-L$ asymmetry dominantly produced by the next-to-lightest neutrino $N_2$. Further consequences and predictions of the model are that: the $N_1$ production implies a specific power-law relation between the reheating temperature of the Universe and the vacuum expectation value of the $SU(2)_R$ triplet; leptogenesis imposes a lower bound on the reheating temperature of the Universe at $7\times10^9\,\mbox{GeV}$. Additionally, the model requires a vanishing absolute neutrino mass scale $m_1\simeq0$. |
0804.3917 | Orlando Panella | Nicola Fabiano and Orlando Panella | Threshold production of meta-stable bound states of Kaluza Klein
excitations in Universal Extra Dimensions | Accepted for publication in Phys. Rev. D. Enhanced version. 13 pages,
5 figures, 2 tables | Phys.Rev.D81:115001,2010 | 10.1103/PhysRevD.81.115001 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the formation and detection at the next linear e^+e^- collider of
bound states of level-1 quark Kaluza-Klein excitations B_KK within a scenario
of universal extra-dimensions (UED). The interactions of such Kaluza-Klein
excitations are modeled by an alpha_s driven Coulomb potential. In order to
obtain the threshold cross-section, we employ the Green function method which
is known to properly describe the peaks below threshold and to yield a net
increase in the continuum region (above threshold) relative to the naive Born
cross-section. We study such effect at different values of the scale (R^-1) of
the extra-dimensions with an explicit calculation of the mass spectrum as given
by radiative corrections. The overall effect is roughly 2.7 at R^-1=300 GeV and
goes down to 2.2 at R^-1=1000 GeV and a relatively large number of events is
expected from N_events ~ 2.5*10^4 at R^-1=300 GeV down to N_events ~ 10^3 at
R^-1=1000 GeV at the anticipated annual integrated luminosity of L_0= 100
fb^-1. We finally discuss some potentially observable signatures such as the
multilepton channels 2j + 2l + missing energy, and 2j + 4l + missing energy for
which we estimate statistical significance >~ 2 for R^-1 up to 600 ~ 700 GeV.
| [
{
"created": "Thu, 24 Apr 2008 12:37:03 GMT",
"version": "v1"
},
{
"created": "Fri, 25 Apr 2008 15:46:34 GMT",
"version": "v2"
},
{
"created": "Tue, 11 May 2010 14:49:16 GMT",
"version": "v3"
},
{
"created": "Wed, 12 May 2010 20:33:26 GMT",
"version": "v4"
}
] | 2015-03-13 | [
[
"Fabiano",
"Nicola",
""
],
[
"Panella",
"Orlando",
""
]
] | We study the formation and detection at the next linear e^+e^- collider of bound states of level-1 quark Kaluza-Klein excitations B_KK within a scenario of universal extra-dimensions (UED). The interactions of such Kaluza-Klein excitations are modeled by an alpha_s driven Coulomb potential. In order to obtain the threshold cross-section, we employ the Green function method which is known to properly describe the peaks below threshold and to yield a net increase in the continuum region (above threshold) relative to the naive Born cross-section. We study such effect at different values of the scale (R^-1) of the extra-dimensions with an explicit calculation of the mass spectrum as given by radiative corrections. The overall effect is roughly 2.7 at R^-1=300 GeV and goes down to 2.2 at R^-1=1000 GeV and a relatively large number of events is expected from N_events ~ 2.5*10^4 at R^-1=300 GeV down to N_events ~ 10^3 at R^-1=1000 GeV at the anticipated annual integrated luminosity of L_0= 100 fb^-1. We finally discuss some potentially observable signatures such as the multilepton channels 2j + 2l + missing energy, and 2j + 4l + missing energy for which we estimate statistical significance >~ 2 for R^-1 up to 600 ~ 700 GeV. |
1904.08054 | Nikolay Achasov | Nikolay Achasov | Electro-weak production of pseudovector C-even heavy quarkonia in
electron-positron collisions on Belle II and BES III | 7 pages, 4 figures, Plenary Talk given at the 12th Workshop on e+e-
Collisions from Phi to Psi, 25.02.2019 - 01.03.2019, Novosibirsk, Russia | null | 10.1051/epjconf/201921202001 | null | hep-ph hep-ex nucl-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is shown that the molecular model for the X{3872) state contradicts the
new experimental data as well as the old ones. It is suggested to study the
\chi_{c1} and \chi_{b1} states in the e+e-\to\chi_{c1}/\chi_{b1} reactions.
| [
{
"created": "Wed, 17 Apr 2019 02:32:29 GMT",
"version": "v1"
}
] | 2019-07-24 | [
[
"Achasov",
"Nikolay",
""
]
] | It is shown that the molecular model for the X{3872) state contradicts the new experimental data as well as the old ones. It is suggested to study the \chi_{c1} and \chi_{b1} states in the e+e-\to\chi_{c1}/\chi_{b1} reactions. |
hep-ph/0304169 | Nigel Glover | E.W.N. Glover and M.E. Tejeda-Yeomans | Two-loop QCD helicity amplitudes for massless quark-massless gauge boson
scattering | 47 pages, JHEP class, three text files with finite remainders of
tree, one-loop and two-loop helicity amplitudes ggHELS.out, gpHELS.out,
ppHELS.out minor typos corrected | JHEP 0306:033,2003 | 10.1088/1126-6708/2003/06/033 | IPPP/03/22, DCTP/03/44, YITP-SB-03-14 | hep-ph | null | We present the two-loop helicity amplitudes for the scattering of massless
quarks and massless gauge bosons in QCD. We use projector techniques to compute
the coefficients of the general tensor describing the two-quark two-boson
amplitude in conventional dimensional regularisation and use these coefficients
to derive the helicity amplitudes in the 't Hooft-Veltman scheme. The structure
of the infrared divergences agrees with that predicted by Catani while
expressions for the finite remainders for q qbar -> gluon gluon, q qbar ->
gluon gamma, q qbar -> gamma gamma and the processes related by crossing
symmetry are given in terms of logarithms and polylogarithms that are real in
the physical region. We have checked that the interference of tree and two-loop
helicity amplitudes, summed over helicities and colours, reproduces the
previous results for the finite remainders for interference of tree and
two-loop amplitudes given in Refs. [1,2]. We also find agreement with the
two-loop helicity amplitudes for quark-gluon scattering presented in Ref. [3].
| [
{
"created": "Wed, 16 Apr 2003 22:53:23 GMT",
"version": "v1"
},
{
"created": "Mon, 5 May 2003 09:41:52 GMT",
"version": "v2"
},
{
"created": "Fri, 29 Jun 2007 12:53:14 GMT",
"version": "v3"
}
] | 2010-02-03 | [
[
"Glover",
"E. W. N.",
""
],
[
"Tejeda-Yeomans",
"M. E.",
""
]
] | We present the two-loop helicity amplitudes for the scattering of massless quarks and massless gauge bosons in QCD. We use projector techniques to compute the coefficients of the general tensor describing the two-quark two-boson amplitude in conventional dimensional regularisation and use these coefficients to derive the helicity amplitudes in the 't Hooft-Veltman scheme. The structure of the infrared divergences agrees with that predicted by Catani while expressions for the finite remainders for q qbar -> gluon gluon, q qbar -> gluon gamma, q qbar -> gamma gamma and the processes related by crossing symmetry are given in terms of logarithms and polylogarithms that are real in the physical region. We have checked that the interference of tree and two-loop helicity amplitudes, summed over helicities and colours, reproduces the previous results for the finite remainders for interference of tree and two-loop amplitudes given in Refs. [1,2]. We also find agreement with the two-loop helicity amplitudes for quark-gluon scattering presented in Ref. [3]. |
hep-ph/0305329 | Grzegorz Wilk | M.Rybczynski, Z.Wlodarczyk and G.Wilk | Possible signal for critical point in hadronization process | Minor misprints corrected. Version to be published in Acta Phys.
Polon. B35 (2004) | Acta Phys.Polon. B35 (2004) 819-836 | null | null | hep-ph nucl-th | null | We argue that recent data on fluctuations observed in heavy ion collisions
show non-monotonic behaviour as function of number of participants (or "wounded
nucleons") N_W. When interpreted in thermodynamical approach this result can be
associated with a possible structure occuring in the corresponding equation of
state (EoS). This in turn could be further interpreted as due to the occurence
of some characteristic points (like "softest point" or "critical point") of EoS
discussed in the literature and therefore be regarded as a possible signal of
the QGP formation in such collisions. We show, however, that the actual
situation is still far from being clear and calls for more investigations of
fluctuation phenomena in multiparticle production processes to be performed.
| [
{
"created": "Fri, 30 May 2003 10:01:32 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Jun 2003 08:01:16 GMT",
"version": "v2"
},
{
"created": "Tue, 19 Aug 2003 14:01:30 GMT",
"version": "v3"
},
{
"created": "Fri, 19 Dec 2003 12:34:21 GMT",
"version": "v4"
},
{
"created": "Mon, 26 Jan 2004 12:24:04 GMT",
"version": "v5"
}
] | 2007-05-23 | [
[
"Rybczynski",
"M.",
""
],
[
"Wlodarczyk",
"Z.",
""
],
[
"Wilk",
"G.",
""
]
] | We argue that recent data on fluctuations observed in heavy ion collisions show non-monotonic behaviour as function of number of participants (or "wounded nucleons") N_W. When interpreted in thermodynamical approach this result can be associated with a possible structure occuring in the corresponding equation of state (EoS). This in turn could be further interpreted as due to the occurence of some characteristic points (like "softest point" or "critical point") of EoS discussed in the literature and therefore be regarded as a possible signal of the QGP formation in such collisions. We show, however, that the actual situation is still far from being clear and calls for more investigations of fluctuation phenomena in multiparticle production processes to be performed. |
hep-ph/0411076 | J. A. R. Cembranos | J. A. R. Cembranos, A. Dobado and A. L. Maroto | A new dark matter candidate in low-tension brane-worlds | 4 pages, 3 figures. Final version to appear in Proceedings of the Vth
Rencontres du Vietnam, Hanoi, August 5-11 2004 | null | null | null | hep-ph | null | Brane world theories contain additional degrees of freedom related to the
geometry of the extra dimension space which can be understood as brane
oscillations (branons). In the case where the fundamental gravitational scale
is much larger than the brane tension scale, these branons are the only extra
degrees of freedom at low energies coming from the extra dimensions. Branons
are generically stable, weakly interacting and massive. They could be produced
in the next generation colliders and at the same time they are natural WIMP
like candidates for dark matter.
| [
{
"created": "Fri, 5 Nov 2004 00:40:58 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Nov 2004 01:37:20 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Cembranos",
"J. A. R.",
""
],
[
"Dobado",
"A.",
""
],
[
"Maroto",
"A. L.",
""
]
] | Brane world theories contain additional degrees of freedom related to the geometry of the extra dimension space which can be understood as brane oscillations (branons). In the case where the fundamental gravitational scale is much larger than the brane tension scale, these branons are the only extra degrees of freedom at low energies coming from the extra dimensions. Branons are generically stable, weakly interacting and massive. They could be produced in the next generation colliders and at the same time they are natural WIMP like candidates for dark matter. |
hep-ph/0507165 | Hungchong Kim | Hungchong Kim and Yongseok Oh | Pentaquarks in SU(3) quark model | Talk given at Quark Nuclear Physics 2005: Nuclear and Hadronic
Systems and Quark Degrees of Freedom, Pyoungchang, Kangwondo, Korea, Feb
22-24, 2005. 10 pages and 1 figure | null | null | null | hep-ph nucl-th | null | Based on the flavor SU(3) symmetry, we classify all the possible pentaquark
baryons made of four quarks and one antiquark. In particular, we present
possible multiplets of pentaquarks, their interactions with mesons, and the
mass relations within a multiplet. We also study the pentaquark decays in the
generalized OZI rule.
| [
{
"created": "Thu, 14 Jul 2005 07:13:14 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Jul 2005 02:29:37 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Kim",
"Hungchong",
""
],
[
"Oh",
"Yongseok",
""
]
] | Based on the flavor SU(3) symmetry, we classify all the possible pentaquark baryons made of four quarks and one antiquark. In particular, we present possible multiplets of pentaquarks, their interactions with mesons, and the mass relations within a multiplet. We also study the pentaquark decays in the generalized OZI rule. |
0812.1506 | Larry McLerran | Larry McLerran | The Ridge, the Glasma and Flow | null | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I discuss the ridge phenomena observed in heavy ion collisions at RHIC. I
argue that the ridge may be due to flux tubes formed from the Color Glass
Condensate in the early Glasma phase of matter produced in such collisions
| [
{
"created": "Mon, 8 Dec 2008 15:19:46 GMT",
"version": "v1"
}
] | 2008-12-09 | [
[
"McLerran",
"Larry",
""
]
] | I discuss the ridge phenomena observed in heavy ion collisions at RHIC. I argue that the ridge may be due to flux tubes formed from the Color Glass Condensate in the early Glasma phase of matter produced in such collisions |
1311.5891 | Catherine Bernaciak | Catherine Bernaciak, Bruce Mellado, Tilman Plehn, Peter Schichtel,
Xifeng Ruan | Improving Higgs plus Jets analyses through Fox--Wolfram Moments | 11 pages, 4 figures, 4 tables | Phys. Rev. D 89, 053006 (2014) | 10.1103/PhysRevD.89.053006 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is well known that understanding the structure of jet radiation can
significantly improve Higgs analyses. Using Fox--Wolfram moments we
systematically study the geometric patterns of additional jets in weak boson
fusion Higgs production with a decay to photons. First, we find a significant
improvement with respect to the standard analysis based on an analysis of the
tagging jet correlations. In addition, we show that replacing a jet veto by a
Fox-Wolfram moment analysis of the extra jet radiation almost doubles the
signal-to-background ratio. Finally, we show that this improvement can also be
achieved based on a modified definition of the Fox--Wolfram moments which
avoids introducing a new physical scale below the factorization scale. This
modification can reduce the impact of theory uncertainties on the Higgs rate
and couplings measurements.
| [
{
"created": "Fri, 22 Nov 2013 21:00:08 GMT",
"version": "v1"
}
] | 2014-03-19 | [
[
"Bernaciak",
"Catherine",
""
],
[
"Mellado",
"Bruce",
""
],
[
"Plehn",
"Tilman",
""
],
[
"Schichtel",
"Peter",
""
],
[
"Ruan",
"Xifeng",
""
]
] | It is well known that understanding the structure of jet radiation can significantly improve Higgs analyses. Using Fox--Wolfram moments we systematically study the geometric patterns of additional jets in weak boson fusion Higgs production with a decay to photons. First, we find a significant improvement with respect to the standard analysis based on an analysis of the tagging jet correlations. In addition, we show that replacing a jet veto by a Fox-Wolfram moment analysis of the extra jet radiation almost doubles the signal-to-background ratio. Finally, we show that this improvement can also be achieved based on a modified definition of the Fox--Wolfram moments which avoids introducing a new physical scale below the factorization scale. This modification can reduce the impact of theory uncertainties on the Higgs rate and couplings measurements. |
1309.2293 | Zoltan Ligeti | Jerome Charles, Sebastien Descotes-Genon, Zoltan Ligeti, Stephane
Monteil, Michele Papucci, Karim Trabelsi | Future sensitivity to new physics in B_d, B_s and K mixings | 12 pages; discussion of MFV extended; a fit for a hypothetical future
new physics signal is added for illustration; first plot in figure 5
corrected; v3 is (essentially) identical to the published article | Phys. Rev. D 89, 033016 (2014) | 10.1103/PhysRevD.89.033016 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We estimate, in a large class of scenarios, the sensitivity to new physics in
B_d and B_s mixings achievable with 50 ab-1 of Belle II and 50 fb-1 of LHCb
data. We find that current limits on new physics contributions in both B_{d,s}
systems can be improved by a factor of ~5 for all values of the CP violating
phases, corresponding to over a factor of 2 increase in the scale of new
physics probed. Assuming the same suppressions by CKM matrix elements as those
of the standard model box diagrams, the scale probed will be about 20 TeV for
tree-level new physics contributions, and about 2 TeV for new physics arising
at one-loop. We also explore the future sensitivity to new physics in K mixing.
Implications for generic new physics and for various specific scenarios, such
as minimal flavor violation, light third-generation dominated flavor violation,
or U(2) flavor models are studied.
| [
{
"created": "Mon, 9 Sep 2013 20:00:07 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Oct 2013 22:41:10 GMT",
"version": "v2"
},
{
"created": "Thu, 27 Feb 2014 23:40:09 GMT",
"version": "v3"
}
] | 2014-03-05 | [
[
"Charles",
"Jerome",
""
],
[
"Descotes-Genon",
"Sebastien",
""
],
[
"Ligeti",
"Zoltan",
""
],
[
"Monteil",
"Stephane",
""
],
[
"Papucci",
"Michele",
""
],
[
"Trabelsi",
"Karim",
""
]
] | We estimate, in a large class of scenarios, the sensitivity to new physics in B_d and B_s mixings achievable with 50 ab-1 of Belle II and 50 fb-1 of LHCb data. We find that current limits on new physics contributions in both B_{d,s} systems can be improved by a factor of ~5 for all values of the CP violating phases, corresponding to over a factor of 2 increase in the scale of new physics probed. Assuming the same suppressions by CKM matrix elements as those of the standard model box diagrams, the scale probed will be about 20 TeV for tree-level new physics contributions, and about 2 TeV for new physics arising at one-loop. We also explore the future sensitivity to new physics in K mixing. Implications for generic new physics and for various specific scenarios, such as minimal flavor violation, light third-generation dominated flavor violation, or U(2) flavor models are studied. |
1607.02474 | Alfredo Urbano | Sebastian Bruggisser, Francesco Riva, Alfredo Urbano | Strongly Interacting Light Dark Matter | 6 pages, 2 figures. v3: minor changes | SciPost Phys. 3, 017 (2017) | 10.21468/SciPostPhys.3.3.017 | DESY 16-122, CERN-TH-2016-153 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the presence of approximate global symmetries that forbid relevant
interactions, strongly coupled light Dark Matter (DM) can appear weakly coupled
at small energy and generate a sizable relic abundance. Fundamental principles
like unitarity restrict these symmetries to a small class, where the leading
interactions are captured by effective operators up to dimension-8. Chiral
symmetry, spontaneously broken global symmetries and non-linearly realized
supersymmetry are examples of this. Their DM candidates (composite fermions,
pseudo Nambu-Goldstone Bosons and Goldstini) are interesting targets for LHC
missing-energy searches.
| [
{
"created": "Fri, 8 Jul 2016 18:03:55 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Mar 2017 08:36:07 GMT",
"version": "v2"
},
{
"created": "Wed, 5 Jul 2017 08:48:21 GMT",
"version": "v3"
}
] | 2017-09-27 | [
[
"Bruggisser",
"Sebastian",
""
],
[
"Riva",
"Francesco",
""
],
[
"Urbano",
"Alfredo",
""
]
] | In the presence of approximate global symmetries that forbid relevant interactions, strongly coupled light Dark Matter (DM) can appear weakly coupled at small energy and generate a sizable relic abundance. Fundamental principles like unitarity restrict these symmetries to a small class, where the leading interactions are captured by effective operators up to dimension-8. Chiral symmetry, spontaneously broken global symmetries and non-linearly realized supersymmetry are examples of this. Their DM candidates (composite fermions, pseudo Nambu-Goldstone Bosons and Goldstini) are interesting targets for LHC missing-energy searches. |
0704.2599 | Jungil Lee | Geoffrey T. Bodwin (Argonne), Eric Braaten, Daekyoung Kang (Ohio State
U.), Jungil Lee (Korea U.) | Inclusive Charm Production in chi_b Decays | 39 pages, 3 figures, Minor corrections, Version published in Phys.
Rev. D | Phys.Rev.D76:054001,2007 | 10.1103/PhysRevD.76.054001 | ANL-HEP-PR-07-20 | hep-ph | null | We calculate the inclusive decay rate of the spin-triplet bottomonium states
chi_{bJ} into charm hadrons, including the leading-order color-singlet and
color-octet bb-bar annihilation mechanisms. We also calculate the momentum
distribution of the charm quark from the decay of chi_{bJ}. The infrared
divergences from the color-singlet process bb-bar -> cc-bar g are factored into
the probability density at the origin for a bb-bar pair in a color-octet state.
That probability density can be determined phenomenologically from the fraction
of decays of chi_{bJ} that include charm hadrons. It can then be used to
predict the partial widths into light hadrons for all four states in the P-wave
bottomonium multiplet.
| [
{
"created": "Thu, 19 Apr 2007 21:04:48 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Sep 2007 01:46:59 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Bodwin",
"Geoffrey T.",
"",
"Argonne"
],
[
"Braaten",
"Eric",
"",
"Ohio State\n U."
],
[
"Kang",
"Daekyoung",
"",
"Ohio State\n U."
],
[
"Lee",
"Jungil",
"",
"Korea U."
]
] | We calculate the inclusive decay rate of the spin-triplet bottomonium states chi_{bJ} into charm hadrons, including the leading-order color-singlet and color-octet bb-bar annihilation mechanisms. We also calculate the momentum distribution of the charm quark from the decay of chi_{bJ}. The infrared divergences from the color-singlet process bb-bar -> cc-bar g are factored into the probability density at the origin for a bb-bar pair in a color-octet state. That probability density can be determined phenomenologically from the fraction of decays of chi_{bJ} that include charm hadrons. It can then be used to predict the partial widths into light hadrons for all four states in the P-wave bottomonium multiplet. |
hep-ph/9305206 | null | Eric Braaten, Kingman Cheung, Tzu Chiang Yuan | Perturbative QCD Fragmentation Functions for $B_c$ and $B_c^*$
Production | Latex, 12 pages, 3 figures available upon request, NUHEP-TH-93-6 | Phys.Rev.D48:5049-5054,1993 | 10.1103/PhysRevD.48.R5049 | null | hep-ph | null | The dominant production mechanism for ${\bar b} c$ bound states in high
energy processes is the production of a high energy ${\bar b}$ or $c$ quark,
followed by its fragmentation into the ${\bar b} c$ state. We calculate the
fragmentation functions for the production of the S-wave states $B_c$ and
$B_c^*$ to leading order in the QCD coupling constant. The fragmentation
probabilities for ${\bar b} \rightarrow B_c$ and ${\bar b} \rightarrow B_c^*$
are approximately $2.2 \times 10^{-4}$ and $3.1 \times 10^{-4}$, while those
for $c \rightarrow B_c$ and $c \rightarrow B_c^*$ are smaller by almost two
orders of magnitude.
| [
{
"created": "Mon, 3 May 1993 20:34:47 GMT",
"version": "v1"
}
] | 2016-09-01 | [
[
"Braaten",
"Eric",
""
],
[
"Cheung",
"Kingman",
""
],
[
"Yuan",
"Tzu Chiang",
""
]
] | The dominant production mechanism for ${\bar b} c$ bound states in high energy processes is the production of a high energy ${\bar b}$ or $c$ quark, followed by its fragmentation into the ${\bar b} c$ state. We calculate the fragmentation functions for the production of the S-wave states $B_c$ and $B_c^*$ to leading order in the QCD coupling constant. The fragmentation probabilities for ${\bar b} \rightarrow B_c$ and ${\bar b} \rightarrow B_c^*$ are approximately $2.2 \times 10^{-4}$ and $3.1 \times 10^{-4}$, while those for $c \rightarrow B_c$ and $c \rightarrow B_c^*$ are smaller by almost two orders of magnitude. |
1307.3248 | Pedro Machado | P. A. N. Machado, H.Minakata, H. Nunokawa, R. Zukanovich Funchal | What can we learn about the lepton CP phase in the next 10 years? | Analyses and plots improved, conclusions unchanged, 23 pages, 8
figures, 1 table | null | 10.1007/JHEP05(2014)109 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss how the lepton CP phase can be constrained by accelerator and
reactor measurements in an era without dedicated experiments for CP violation
search. To characterize globally the sensitivity to the CP phase \delta_{CP},
we introduce a new measure, the CP exclusion fraction, which quantifies what
fraction of the \delta_{CP} space can be excluded at a given input values of
\theta_{23} and \delta_{CP}. Using the measure we study the CP sensitivity
which may be possessed by the accelerator experiments T2K and NOvA. We show
that, if the mass hierarchy is known, T2K and NOvA alone may exclude,
respectively, about 50%-60% and 40%-50% of the \delta_{CP} space at 90% CL by
10 years running, provided that a considerable fraction of beam time is devoted
to the antineutrino run. The synergy between T2K and NOvA is remarkable,
leading to the determination of the mass hierarchy through CP sensitivity at
the same CL.
| [
{
"created": "Thu, 11 Jul 2013 20:00:02 GMT",
"version": "v1"
},
{
"created": "Fri, 6 Dec 2013 10:18:18 GMT",
"version": "v2"
}
] | 2015-06-16 | [
[
"Machado",
"P. A. N.",
""
],
[
"Minakata",
"H.",
""
],
[
"Nunokawa",
"H.",
""
],
[
"Funchal",
"R. Zukanovich",
""
]
] | We discuss how the lepton CP phase can be constrained by accelerator and reactor measurements in an era without dedicated experiments for CP violation search. To characterize globally the sensitivity to the CP phase \delta_{CP}, we introduce a new measure, the CP exclusion fraction, which quantifies what fraction of the \delta_{CP} space can be excluded at a given input values of \theta_{23} and \delta_{CP}. Using the measure we study the CP sensitivity which may be possessed by the accelerator experiments T2K and NOvA. We show that, if the mass hierarchy is known, T2K and NOvA alone may exclude, respectively, about 50%-60% and 40%-50% of the \delta_{CP} space at 90% CL by 10 years running, provided that a considerable fraction of beam time is devoted to the antineutrino run. The synergy between T2K and NOvA is remarkable, leading to the determination of the mass hierarchy through CP sensitivity at the same CL. |
hep-ph/9312356 | Nikola Zovko | A.A.Bolokhov and N.Zovko | Finite $3\pi$ Cut Approximation for the $\pi N\bar{N}$ Form Factor | 17 pages, Latex | Phys.Rev.C50:24-30,1994 | 10.1103/PhysRevC.50.24 | null | hep-ph | null | Assuming the length of the $3\pi$ cut to be finite and approximating the
integrated amplitude by a constant, we derive an expression for the $\pi
N\bar{N}$ form factor which is very close to that given by a simple pole. The
specific predictions of the obtained form factor for the region of small
momentum transfer are discussed along the lines of the Goldberger-Treiman
relation.
| [
{
"created": "Thu, 30 Dec 1993 15:02:19 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Bolokhov",
"A. A.",
""
],
[
"Zovko",
"N.",
""
]
] | Assuming the length of the $3\pi$ cut to be finite and approximating the integrated amplitude by a constant, we derive an expression for the $\pi N\bar{N}$ form factor which is very close to that given by a simple pole. The specific predictions of the obtained form factor for the region of small momentum transfer are discussed along the lines of the Goldberger-Treiman relation. |
1611.04313 | Oleg Selyugin | O.V. Selyugin and J.-R. Cudell | An Analysis of the New LHC Data through the Dispersion Relations | 5 pages | null | 10.1063/1.4977147 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyse the tension between the (indirect) measurements of the total cross
section, and show the impact of various assumptions on the extraction of the
parameters from the elastic scattering amplitude, with a special attention to
the total cross section. In particular, the determination of the phase of the
elastic scattering amplitude will play an important role, and we shall study it
via dispersion relations. We shall also examine the origin of the dependence on
momentum transfer of the slopes of the different parts of the scattering
amplitude in different models. We shall also give the results of another
similar analysis based on a Regge-trajectory approach for the hadron scattering
amplitude.
| [
{
"created": "Mon, 14 Nov 2016 10:04:54 GMT",
"version": "v1"
}
] | 2017-04-05 | [
[
"Selyugin",
"O. V.",
""
],
[
"Cudell",
"J. -R.",
""
]
] | We analyse the tension between the (indirect) measurements of the total cross section, and show the impact of various assumptions on the extraction of the parameters from the elastic scattering amplitude, with a special attention to the total cross section. In particular, the determination of the phase of the elastic scattering amplitude will play an important role, and we shall study it via dispersion relations. We shall also examine the origin of the dependence on momentum transfer of the slopes of the different parts of the scattering amplitude in different models. We shall also give the results of another similar analysis based on a Regge-trajectory approach for the hadron scattering amplitude. |
hep-ph/0603187 | Dave Dunbar dr | Zvi Bern, N.E.J. Bjerrum-Bohr, David C. Dunbar and Harald Ita | Recursive Approach to One-loop QCD Matrix Elements | 6 pages, to appear in the proceedings of the 7th International
Symposium on Radiative Corrections: Application of Quantum Field Theory to
Phenomenology (RADCOR 2005), Japan, 2-7 Oct 2005 | null | 10.1016/j.nuclphysbps.2006.03.041 | SWAT-452 | hep-ph | null | We describe the recursive Approach to One-loop QCD Matrix Elements.
| [
{
"created": "Thu, 23 Mar 2006 11:53:19 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Bern",
"Zvi",
""
],
[
"Bjerrum-Bohr",
"N. E. J.",
""
],
[
"Dunbar",
"David C.",
""
],
[
"Ita",
"Harald",
""
]
] | We describe the recursive Approach to One-loop QCD Matrix Elements. |
hep-ph/0311261 | Mohamed Chabab | Mohamed Chabab | Strong CP problem, Neutron EDM and Thermal QCD sum rules | 08 pages. Contributed to Hadron 03: 10th International Conference on
Hadron Spectroscopy, Aschaffenburg, Germany, 31 Aug - 6 Sep 2003 | AIP Conf. Proc. 717, (2004) 695-700. | 10.1063/1.1799782 | LPHEA / 03-12 | hep-ph | null | The behaviour of the broken CP symmetry at finite temperature is examined.
This is achieved through the investigation of the neutron electric dipole
moment $d_n$ induced by $\theta$-term.
By using thermal QCD sum rules, we find that below the critical temperature,
the ratio $\mid {d_n \over \bar{\theta}}\mid$ slightly decreases but survives
at temperature effects. This evolution implies that CP remains broken at finite
temperature as required by Baryogenesis \cite{Chabab}.
| [
{
"created": "Thu, 20 Nov 2003 15:47:26 GMT",
"version": "v1"
}
] | 2016-09-06 | [
[
"Chabab",
"Mohamed",
""
]
] | The behaviour of the broken CP symmetry at finite temperature is examined. This is achieved through the investigation of the neutron electric dipole moment $d_n$ induced by $\theta$-term. By using thermal QCD sum rules, we find that below the critical temperature, the ratio $\mid {d_n \over \bar{\theta}}\mid$ slightly decreases but survives at temperature effects. This evolution implies that CP remains broken at finite temperature as required by Baryogenesis \cite{Chabab}. |
hep-ph/9409240 | L. T. Handoko | L.T. Handoko and T. Morozumi Pages : 19 pages | $b \to s(d) \gamma$ with a Vector-like Quark as Fourth-generation | 4 figures are included and 1 figure is excluded | Mod.Phys.Lett. A10 (1995) 309-322; Erratum-ibid. A10 (1995) 1733 | 10.1142/S021773239500034X | HUPD-9409 | hep-ph | null | We study the implications of a vector-like quark, especially a down-type
vector-like quark in $b \rightarrow s(d) \gamma$ including the neutral Higgs in
the calculation. After analyzing some possible constraints for the mixing, the
contribution may be significant for the $b \rightarrow d \gamma$, but not for
the $b \rightarrow s \gamma$. We also find that the FCNC among ordinary quarks
vanishes for a special form of down-type quark mass matrix.
| [
{
"created": "Wed, 7 Sep 1994 05:14:06 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Nov 1994 12:23:44 GMT",
"version": "v2"
},
{
"created": "Tue, 31 Jan 1995 12:56:47 GMT",
"version": "v3"
}
] | 2012-08-27 | [
[
"Handoko",
"L. T.",
""
],
[
"Pages",
"T. Morozumi",
""
],
[
":",
"",
""
],
[
"pages",
"19",
""
]
] | We study the implications of a vector-like quark, especially a down-type vector-like quark in $b \rightarrow s(d) \gamma$ including the neutral Higgs in the calculation. After analyzing some possible constraints for the mixing, the contribution may be significant for the $b \rightarrow d \gamma$, but not for the $b \rightarrow s \gamma$. We also find that the FCNC among ordinary quarks vanishes for a special form of down-type quark mass matrix. |
2201.12363 | Rabah Abdul Khalek | Rabah Abdul Khalek, Rhorry Gauld, Tommaso Giani, Emanuele R. Nocera,
Tanjona R. Rabemananjara and Juan Rojo | NNNPDF3.0: Evidence for a modified partonic structure in heavy nuclei | 61 pages, 38 figures | null | null | Nikhef-2021-028, BONN-TH-2021-14 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present an updated determination of nuclear parton distributions (nPDFs)
from a global NLO QCD analysis of hard processes in fixed-target lepton-nucleus
and proton-nucleus together with collider proton-nucleus experiments. In
addition to neutral- and charged-current deep-inelastic and Drell-Yan
measurements on nuclear targets, we consider the information provided by the
production of electroweak gauge bosons, isolated photons, jet pairs, and
charmed mesons in proton-lead collisions at the LHC across centre-of-mass
energies of 5.02 TeV (Run I) and 8.16 TeV (Run II). For the first time in a
global nPDF analysis, the constraints from these various processes are
accounted for both in the nuclear PDFs and in the free-proton PDF baseline. The
extensive dataset underlying the nNNPDF3.0 determination, combined with its
model-independent parametrisation, reveals strong evidence for nuclear-induced
modifications of the partonic structure of heavy nuclei, specifically for the
small-$x$ shadowing of gluons and sea quarks, as well as the large-$x$
anti-shadowing of gluons. As a representative phenomenological application, we
provide predictions for ultra-high-energy neutrino-nucleon cross-sections,
relevant for data interpretation at neutrino observatories. Our results provide
key input for ongoing and future experimental programs, from that of heavy-ion
collisions in controlled collider environments to the study of high-energy
astrophysical processes.
| [
{
"created": "Fri, 28 Jan 2022 19:00:00 GMT",
"version": "v1"
},
{
"created": "Thu, 26 May 2022 00:17:43 GMT",
"version": "v2"
}
] | 2022-05-27 | [
[
"Khalek",
"Rabah Abdul",
""
],
[
"Gauld",
"Rhorry",
""
],
[
"Giani",
"Tommaso",
""
],
[
"Nocera",
"Emanuele R.",
""
],
[
"Rabemananjara",
"Tanjona R.",
""
],
[
"Rojo",
"Juan",
""
]
] | We present an updated determination of nuclear parton distributions (nPDFs) from a global NLO QCD analysis of hard processes in fixed-target lepton-nucleus and proton-nucleus together with collider proton-nucleus experiments. In addition to neutral- and charged-current deep-inelastic and Drell-Yan measurements on nuclear targets, we consider the information provided by the production of electroweak gauge bosons, isolated photons, jet pairs, and charmed mesons in proton-lead collisions at the LHC across centre-of-mass energies of 5.02 TeV (Run I) and 8.16 TeV (Run II). For the first time in a global nPDF analysis, the constraints from these various processes are accounted for both in the nuclear PDFs and in the free-proton PDF baseline. The extensive dataset underlying the nNNPDF3.0 determination, combined with its model-independent parametrisation, reveals strong evidence for nuclear-induced modifications of the partonic structure of heavy nuclei, specifically for the small-$x$ shadowing of gluons and sea quarks, as well as the large-$x$ anti-shadowing of gluons. As a representative phenomenological application, we provide predictions for ultra-high-energy neutrino-nucleon cross-sections, relevant for data interpretation at neutrino observatories. Our results provide key input for ongoing and future experimental programs, from that of heavy-ion collisions in controlled collider environments to the study of high-energy astrophysical processes. |
1101.2585 | Tommy Ohlsson | Mattias Blennow, Henrik Melbeus, Tommy Ohlsson, He Zhang | Renormalization Group Running of the Neutrino Mass Operator in Extra
Dimensions | 20 pages, 5 figures, REVTeX4-1. (v2) Final version published in J.
High Energy Phys. (v3) A short clarification at the end of the appendix has
been added | JHEP 1104:052,2011 | 10.1007/JHEP04(2011)052 | MPP-2011-2 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the renormalization group (RG) running of the neutrino masses and
the leptonic mixing parameters in two different extra-dimensional models,
namely, the Universal Extra Dimensions (UED) model and a model, where the
Standard Model (SM) bosons probe an extra dimension and the SM fermions are
confined to a four-dimensional brane. In particular, we derive the beta
function for the neutrino mass operator in the UED model. We also rederive the
beta function for the charged-lepton Yukawa coupling, and confirm some of the
existing results in the literature. The generic features of the RG running of
the neutrino parameters within the two models are analyzed and, in particular,
we observe a power-law behavior for the running. We note that the running of
the leptonic mixing angle \theta_{12} can be sizable, while the running of
\theta_{23} and \theta_{13} is always negligible. In addition, we show that the
tri-bimaximal and the bimaximal mixing patterns at a high-energy scale are
compatible with low-energy experimental data, while a tri-small mixing pattern
is not. Finally, we perform a numerical scan over the low-energy parameter
space to infer the high-energy distribution of the parameters. Using this scan,
we also demonstrate how the high-energy \theta_{12} is correlated with the
smallest neutrino mass and the Majorana phases.
| [
{
"created": "Thu, 13 Jan 2011 15:35:57 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Jun 2011 08:59:58 GMT",
"version": "v2"
},
{
"created": "Tue, 15 Apr 2014 15:22:25 GMT",
"version": "v3"
}
] | 2014-04-16 | [
[
"Blennow",
"Mattias",
""
],
[
"Melbeus",
"Henrik",
""
],
[
"Ohlsson",
"Tommy",
""
],
[
"Zhang",
"He",
""
]
] | We study the renormalization group (RG) running of the neutrino masses and the leptonic mixing parameters in two different extra-dimensional models, namely, the Universal Extra Dimensions (UED) model and a model, where the Standard Model (SM) bosons probe an extra dimension and the SM fermions are confined to a four-dimensional brane. In particular, we derive the beta function for the neutrino mass operator in the UED model. We also rederive the beta function for the charged-lepton Yukawa coupling, and confirm some of the existing results in the literature. The generic features of the RG running of the neutrino parameters within the two models are analyzed and, in particular, we observe a power-law behavior for the running. We note that the running of the leptonic mixing angle \theta_{12} can be sizable, while the running of \theta_{23} and \theta_{13} is always negligible. In addition, we show that the tri-bimaximal and the bimaximal mixing patterns at a high-energy scale are compatible with low-energy experimental data, while a tri-small mixing pattern is not. Finally, we perform a numerical scan over the low-energy parameter space to infer the high-energy distribution of the parameters. Using this scan, we also demonstrate how the high-energy \theta_{12} is correlated with the smallest neutrino mass and the Majorana phases. |
hep-ph/9310275 | Poul Olesen | P. Olesen | A W--dressed Electroweak String | 8 pages, LaTeX, NBI-HE-93-58 | null | null | null | hep-ph | null | We give plausibility arguments for the existence of a $W$--dressed
electroweak string for the \ws ~model with $\th_W = 0$. This string is a
$Z$--string which in the core has a finite energy contribution from
$W$--condensation induced by the anomalous magnetic moment in the \ym field.
The solution which has minimum energy at $r=0$ interpolates between the
unbroken $(r=0)$ and the broken $(r \ra \infty) \ SU(2) \times U_y(1)$ phase.
| [
{
"created": "Wed, 13 Oct 1993 09:47:11 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Olesen",
"P.",
""
]
] | We give plausibility arguments for the existence of a $W$--dressed electroweak string for the \ws ~model with $\th_W = 0$. This string is a $Z$--string which in the core has a finite energy contribution from $W$--condensation induced by the anomalous magnetic moment in the \ym field. The solution which has minimum energy at $r=0$ interpolates between the unbroken $(r=0)$ and the broken $(r \ra \infty) \ SU(2) \times U_y(1)$ phase. |
hep-ph/0405246 | Byung-Yoon Park | Byung-Yoon Park, Mannque Rho, Dong-Pil Min | Kaon-Soliton Bound State Approach to the Pentaquark States | Change of title, erroneous statements, e.g., re: interpretation of
the widths, corrected, results remain unmodified | Phys.Rev. D70 (2004) 114026 | 10.1103/PhysRevD.70.114026 | null | hep-ph nucl-th | null | We show that in hidden local symmetry theory with the vector manifestation
(VM), a K^+ can be bound to skyrmion to give the Theta^+ pentaquark with spin
1/2 and even parity which is consistent with large N_c counting. The vector
meson K^* subject to the VM in the chiral limit plays an essential role in
inducing the binding.
| [
{
"created": "Tue, 25 May 2004 08:20:19 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Jun 2004 01:58:22 GMT",
"version": "v2"
},
{
"created": "Fri, 24 Sep 2004 02:11:48 GMT",
"version": "v3"
},
{
"created": "Thu, 7 Oct 2004 11:26:32 GMT",
"version": "v4"
}
] | 2009-11-10 | [
[
"Park",
"Byung-Yoon",
""
],
[
"Rho",
"Mannque",
""
],
[
"Min",
"Dong-Pil",
""
]
] | We show that in hidden local symmetry theory with the vector manifestation (VM), a K^+ can be bound to skyrmion to give the Theta^+ pentaquark with spin 1/2 and even parity which is consistent with large N_c counting. The vector meson K^* subject to the VM in the chiral limit plays an essential role in inducing the binding. |
1209.2774 | Asmita Mukherjee | Asmita Mukherjee | Sivers Asymmetry in $e+p^\uparrow \rightarrow e+J/\psi+X$ | Talk given at the QCD Evolution Workshop, May 14-17, 2012, Jefferson
Lab, Newport News, USA | null | 10.1142/S2010194512009208 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A recent investigation of the single spin asymmetry (SSA) in low virtuality
electroproduction/photoproduction of $J/\psi$ in color evaporation model is
presented. It is shown that the asymmetry is sizable and can be used as a probe
for the still unknown gluon Sivers function.
| [
{
"created": "Thu, 13 Sep 2012 03:32:02 GMT",
"version": "v1"
}
] | 2015-06-11 | [
[
"Mukherjee",
"Asmita",
""
]
] | A recent investigation of the single spin asymmetry (SSA) in low virtuality electroproduction/photoproduction of $J/\psi$ in color evaporation model is presented. It is shown that the asymmetry is sizable and can be used as a probe for the still unknown gluon Sivers function. |
2209.04456 | Taylor Murphy | Linda M. Carpenter, Taylor Murphy, Katherine Schwind | Leptonic signatures of color-sextet scalars | 17 pages, 14 figures. Updated to resemble Phys. Rev. D Version of
Record | Phys. Rev. D 106, 115006 (2022) | 10.1103/PhysRevD.106.115006 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Color-sextet scalars could have an array of possible couplings to the
Standard Model beyond their well known renormalizable couplings to quark pairs.
The next-largest couplings these scalars might enjoy have mass dimension six,
and some include electroweak fields and can therefore produce highly
distinctive signals at hadron colliders. Here we study the single production of
color-sextet scalars in association with a hard lepton, which results from a
dimension-six coupling to leptons in addition to quarks and gluons. We identify
parameter space in which these scalars decay promptly and propose a search for
such particles in final states with two jets and an opposite-charge lepton
pair, one member of which has high momentum. We then impose our selection
criteria on the proposed signal and its leading backgrounds to project the
discovery potential and exclusion limits during the next runs of the LHC. We
compare our search with existing searches for leptoquarks, and we find we
achieve much higher sensitivity with our tailored approach due to the unique
kinematics of leptonic sextet events.
| [
{
"created": "Fri, 9 Sep 2022 18:00:00 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Dec 2022 17:18:30 GMT",
"version": "v2"
}
] | 2022-12-09 | [
[
"Carpenter",
"Linda M.",
""
],
[
"Murphy",
"Taylor",
""
],
[
"Schwind",
"Katherine",
""
]
] | Color-sextet scalars could have an array of possible couplings to the Standard Model beyond their well known renormalizable couplings to quark pairs. The next-largest couplings these scalars might enjoy have mass dimension six, and some include electroweak fields and can therefore produce highly distinctive signals at hadron colliders. Here we study the single production of color-sextet scalars in association with a hard lepton, which results from a dimension-six coupling to leptons in addition to quarks and gluons. We identify parameter space in which these scalars decay promptly and propose a search for such particles in final states with two jets and an opposite-charge lepton pair, one member of which has high momentum. We then impose our selection criteria on the proposed signal and its leading backgrounds to project the discovery potential and exclusion limits during the next runs of the LHC. We compare our search with existing searches for leptoquarks, and we find we achieve much higher sensitivity with our tailored approach due to the unique kinematics of leptonic sextet events. |
hep-ph/0401209 | Yuan C.-P. | H.-J. He, Y.-P. Kuang, C.-P. Yuan, and B. Zhang | W^+ W^+ Scattering as a Sensitive Test of the Anomalous Gauge Couplings
of the Higgs Boson at the LHC | 5 pages, LaTeX, 1 eps figure, submitted to the proceedings of the
Workshop on Physics at TeV Colliders, Les Houches, France, 26 May -- 6 June
2003 | null | null | null | hep-ph | null | We propose a sensitive way to test the anomalous HVV couplings (V=W^\pm, Z^0)
of the Higgs boson (H), which can arise from either the dimension-3 effective
operator in a nonlinearly realized Higgs sector or the dimension-6 effective
operators in a linearly realized Higgs sector, via studying the VV scattering
processes at the CERN Large Hadron Collider (LHC). We show that, with an
integrated luminosity of 300 fb^{-1} and sufficient kinematical cuts for
suppressing the backgrounds, studying the process pp \to W^+ W^+ j j \to \l^+
\nu \l^+ \nu j j can probe the anomalous HWW couplings at a few tens of percent
level for the nonlinearly realized Higgs sector, and at the level of 0.01-0.08
TeV^{-1} for the linearly realized effective Lagrangian.
| [
{
"created": "Mon, 26 Jan 2004 19:33:32 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Jan 2004 04:44:12 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"He",
"H. -J.",
""
],
[
"Kuang",
"Y. -P.",
""
],
[
"Yuan",
"C. -P.",
""
],
[
"Zhang",
"B.",
""
]
] | We propose a sensitive way to test the anomalous HVV couplings (V=W^\pm, Z^0) of the Higgs boson (H), which can arise from either the dimension-3 effective operator in a nonlinearly realized Higgs sector or the dimension-6 effective operators in a linearly realized Higgs sector, via studying the VV scattering processes at the CERN Large Hadron Collider (LHC). We show that, with an integrated luminosity of 300 fb^{-1} and sufficient kinematical cuts for suppressing the backgrounds, studying the process pp \to W^+ W^+ j j \to \l^+ \nu \l^+ \nu j j can probe the anomalous HWW couplings at a few tens of percent level for the nonlinearly realized Higgs sector, and at the level of 0.01-0.08 TeV^{-1} for the linearly realized effective Lagrangian. |
hep-ph/0001311 | Alberico | S.M. Bilenky (Joint Institute for Nuclear Research, Dubna, Russia) | Neutrino masses, mixing and oscillations | 39 pages, 1 figure | Lectures given at the 1999 European School of High Energy Physics,
Casta Papiernicka, Slovakia, August 22- September 4, 1999 | null | null | hep-ph | null | These are lectures given at the CERN-JINR school on high energy physics. The
possibilities of the mixing of massive Dirac and Majorana neutrinos are
discussed. The theory of neutrino oscillations in vacuum is presented. The
trasitions between differen flavor neutrinos in matter are discussed. A short
review of the results of the neutrino oscillation experiments is provided.
| [
{
"created": "Sat, 29 Jan 2000 17:27:02 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Bilenky",
"S. M.",
"",
"Joint Institute for Nuclear Research, Dubna, Russia"
]
] | These are lectures given at the CERN-JINR school on high energy physics. The possibilities of the mixing of massive Dirac and Majorana neutrinos are discussed. The theory of neutrino oscillations in vacuum is presented. The trasitions between differen flavor neutrinos in matter are discussed. A short review of the results of the neutrino oscillation experiments is provided. |
hep-ph/9904204 | Beata Ziaja | B. Ziaja | Implementation of the recovering corrections into the intermittent data
analysis | 11 pages, latex, 1 figure | Acta Phys.Polon. B30 (1999) 2737-2746 | null | null | hep-ph | null | The improved method of intermittent data analysis is proposed. It exploits,
in addition to the standard density moments, the information on the bin-bin
correlations, observed in the data and expressed in terms of the density
correlators. The improving recovering corrections are implemented into the data
analysis in the form of the recursive algorithm, and tested in the framework of
multiplicative cascading models.
| [
{
"created": "Thu, 1 Apr 1999 12:47:09 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Ziaja",
"B.",
""
]
] | The improved method of intermittent data analysis is proposed. It exploits, in addition to the standard density moments, the information on the bin-bin correlations, observed in the data and expressed in terms of the density correlators. The improving recovering corrections are implemented into the data analysis in the form of the recursive algorithm, and tested in the framework of multiplicative cascading models. |
hep-ph/0008190 | Angie Yerks | Gordon L. Kane | The Supersymmetry Soft-breaking Lagrangian - Where Experiment and String
Theory Meet | 45 pages, 7 figures; Lectures at the Latin American School SILAFAE
III, April 2000, Cartagena, Colombia -- Revised version 8/29/00 | null | null | null | hep-ph hep-ex hep-th | null | After an introduction recalling that we expect low energy supersymmetry to be
part of our description of nature because of considerable indirect evidence and
successful predictions, and a discussion of the essential role of data for
formulating and testing string theory, these lectures focus on the role of the
supersymmetry soft-breaking Lagrangian in connecting experiment and string
theory. How to measure tan$\beta$ and the soft parameters is examined via a
number of applications, and the difficulty of measuring tan$\beta$ at hadron
colliders is explained. In each case the important role of soft phases is made
explicit, and the true number of parameters is counted. Applications include
the chargino and neutralino sectors, the Higgs sector and how its results
change when phases are included, measuring the (relative) gluino phase, CP
violation in K and B systems and whether all CP violation can be due to soft
phases, how to learn if the LSP is the cold dark matter of the universe, and
baryogenesis. It is emphasized that the success of supersymmetry in explaining
the breaking of electroweak symmetry is probably its most important
achievement, and implications of that explanation for superpartner masses are
shown. Combining many of these considerations, a further application argues
that a lepton collider of total energy 600 GeV with a polarized beam is one we
can be confident will do important physics even after LHC. The question of the
origins of CP violation, whether the CKM phase can be zero, and the possibility
that the soft phases can tell us about compactification and supersymmetry
breaking are discussed. Some of the applications and issues are examined in a
D-brane based model that can describe the usual collider and dark matter
phenomenology, and includes phases and CP violation as well.
| [
{
"created": "Thu, 17 Aug 2000 21:19:10 GMT",
"version": "v1"
},
{
"created": "Thu, 24 Aug 2000 13:42:04 GMT",
"version": "v2"
},
{
"created": "Tue, 29 Aug 2000 13:18:25 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Kane",
"Gordon L.",
""
]
] | After an introduction recalling that we expect low energy supersymmetry to be part of our description of nature because of considerable indirect evidence and successful predictions, and a discussion of the essential role of data for formulating and testing string theory, these lectures focus on the role of the supersymmetry soft-breaking Lagrangian in connecting experiment and string theory. How to measure tan$\beta$ and the soft parameters is examined via a number of applications, and the difficulty of measuring tan$\beta$ at hadron colliders is explained. In each case the important role of soft phases is made explicit, and the true number of parameters is counted. Applications include the chargino and neutralino sectors, the Higgs sector and how its results change when phases are included, measuring the (relative) gluino phase, CP violation in K and B systems and whether all CP violation can be due to soft phases, how to learn if the LSP is the cold dark matter of the universe, and baryogenesis. It is emphasized that the success of supersymmetry in explaining the breaking of electroweak symmetry is probably its most important achievement, and implications of that explanation for superpartner masses are shown. Combining many of these considerations, a further application argues that a lepton collider of total energy 600 GeV with a polarized beam is one we can be confident will do important physics even after LHC. The question of the origins of CP violation, whether the CKM phase can be zero, and the possibility that the soft phases can tell us about compactification and supersymmetry breaking are discussed. Some of the applications and issues are examined in a D-brane based model that can describe the usual collider and dark matter phenomenology, and includes phases and CP violation as well. |
1009.2264 | Fei Wang | Csaba Bal\'azs, Tianjun Li, Fei Wang and Jin Min Yang | SU(7) Unification of SU(3)_C*SU(4)_W* U(1)_{B-L} | 25 pages, 1 figures | JHEP 1101:023,2011 | 10.1007/JHEP01(2011)023 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose the SUSY SU(7) unification of the SU(3)_C* SU(4)_W* U(1)_{B-L}
model. Such unification scenario has rich symmetry breaking chains in a
five-dimensional orbifold. We study in detail the SUSY SU(7) symmetry breaking
into SU(3)_C* SU(4)_W* U(1)_{B-L} by boundary conditions in a Randall-Sundrum
background and its AdS/CFT interpretation. We find that successful gauge
coupling unification can be achieved in our scenario. Gauge unification favors
low left-right and unification scales with tree-level \sin^2\theta_W=0.15. We
use the AdS/CFT dual of the conformal supersymmetry breaking scenario to break
the remaining N=1 supersymmetry. We employ AdS/CFT to reproduce the NSVZ
formula and obtain the structure of the Seiberg duality in the strong coupling
region for 3/2N_c<N_F<3N_C. We show that supersymmetry is indeed broken in the
conformal supersymmetry breaking scenario with a vanishing singlet vacuum
expectation value.
| [
{
"created": "Sun, 12 Sep 2010 21:08:26 GMT",
"version": "v1"
},
{
"created": "Sun, 16 Jan 2011 10:14:21 GMT",
"version": "v2"
}
] | 2011-01-18 | [
[
"Balázs",
"Csaba",
""
],
[
"Li",
"Tianjun",
""
],
[
"Wang",
"Fei",
""
],
[
"Yang",
"Jin Min",
""
]
] | We propose the SUSY SU(7) unification of the SU(3)_C* SU(4)_W* U(1)_{B-L} model. Such unification scenario has rich symmetry breaking chains in a five-dimensional orbifold. We study in detail the SUSY SU(7) symmetry breaking into SU(3)_C* SU(4)_W* U(1)_{B-L} by boundary conditions in a Randall-Sundrum background and its AdS/CFT interpretation. We find that successful gauge coupling unification can be achieved in our scenario. Gauge unification favors low left-right and unification scales with tree-level \sin^2\theta_W=0.15. We use the AdS/CFT dual of the conformal supersymmetry breaking scenario to break the remaining N=1 supersymmetry. We employ AdS/CFT to reproduce the NSVZ formula and obtain the structure of the Seiberg duality in the strong coupling region for 3/2N_c<N_F<3N_C. We show that supersymmetry is indeed broken in the conformal supersymmetry breaking scenario with a vanishing singlet vacuum expectation value. |
1902.06240 | Maksym Ovchynnikov | Kyrylo Bondarenko, Alexey Boyarsky, Maksym Ovchynnikov, Oleg
Ruchayskiy | Sensitivity of the intensity frontier experiments for neutrino and
scalar portals: analytic estimates | Journal version | JHEP 2019 | 10.1007/JHEP08(2019)061 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In recent years, a number of intensity-frontier experiments have been
proposed to search for feebly interacting particles with a mass in the GeV
range. We show analytically how the characteristic shape of the sensitivity
regions of such experiments - upper and lower boundaries of the probed region,
the maximal mass reach - depends on the parameters of the experiments, taking
the SHiP and the MATHUSLA experiments as an example. We find a good agreement
of our estimates with the results of the Monte Carlo simulations.
| [
{
"created": "Sun, 17 Feb 2019 10:43:07 GMT",
"version": "v1"
},
{
"created": "Sun, 11 Aug 2019 16:28:38 GMT",
"version": "v2"
}
] | 2019-10-21 | [
[
"Bondarenko",
"Kyrylo",
""
],
[
"Boyarsky",
"Alexey",
""
],
[
"Ovchynnikov",
"Maksym",
""
],
[
"Ruchayskiy",
"Oleg",
""
]
] | In recent years, a number of intensity-frontier experiments have been proposed to search for feebly interacting particles with a mass in the GeV range. We show analytically how the characteristic shape of the sensitivity regions of such experiments - upper and lower boundaries of the probed region, the maximal mass reach - depends on the parameters of the experiments, taking the SHiP and the MATHUSLA experiments as an example. We find a good agreement of our estimates with the results of the Monte Carlo simulations. |
1708.07504 | Alexey A. Petrov | Bhubanjyoti Bhattacharya, Alexey A Petrov | Hadronic decays of B_c mesons with flavor SU(3)_F symmetry | 12 pages, 2 tables, no figures | null | 10.1016/j.physletb.2017.10.004 | WSU-HEP-1711 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study implications of a recent observation of non-leptonic $B^+_c\to D^0
K^+$ decay and a bound on $B^+_c\to D^0 \pi^+$ transition on CP-violating
asymmetries in $B_c$ decays. In the U-spin symmetry limit, we derive a relation
between the CP-asymmetries in the $B^+_c\to D^0 K^+$ and $B^+_c\to D^0 \pi^+$
channels and the corresponding branching ratios. We also derive several
relations between non-leptonic $B_c$ decays into the final states with $D$
mesons in the flavor $SU(3)_F$ limit. We point out that a combined study of
$SU(3)_F$ amplitudes in these decays can be used to constrain the angle
$\gamma$ of the Cabibbo-Kobayashi-Maskawa (CKM) matrix.
| [
{
"created": "Thu, 24 Aug 2017 17:44:01 GMT",
"version": "v1"
}
] | 2017-11-22 | [
[
"Bhattacharya",
"Bhubanjyoti",
""
],
[
"Petrov",
"Alexey A",
""
]
] | We study implications of a recent observation of non-leptonic $B^+_c\to D^0 K^+$ decay and a bound on $B^+_c\to D^0 \pi^+$ transition on CP-violating asymmetries in $B_c$ decays. In the U-spin symmetry limit, we derive a relation between the CP-asymmetries in the $B^+_c\to D^0 K^+$ and $B^+_c\to D^0 \pi^+$ channels and the corresponding branching ratios. We also derive several relations between non-leptonic $B_c$ decays into the final states with $D$ mesons in the flavor $SU(3)_F$ limit. We point out that a combined study of $SU(3)_F$ amplitudes in these decays can be used to constrain the angle $\gamma$ of the Cabibbo-Kobayashi-Maskawa (CKM) matrix. |
2206.14839 | Howard Baer | Howard Baer, Vernon Barger, Dakotah Martinez and Shadman Salam | Fine-tuned vs. natural supersymmetry: what does the string landscape
predict? | 19 pages with 3 .png figures; version 2 contains added figure and
some clarifying text | null | 10.1007/JHEP09(2022)125 | OU-HEP-220702 | hep-ph | http://creativecommons.org/licenses/by/4.0/ | A vast array of (metastable) vacuum solutions arise from string
compactifications, each leading to different 4-d laws of physics. The space of
these solutions, known as the string landscape, allows for an environmental
solution to the cosmological constant problem. We examine the possibility of an
environmental solution to the gauge hierarchy problem. We argue that the
landscape favors softly broken supersymmetric models over particle physics
models containing quadratic divergences, such as the Standard Model. We present
a scheme for computing relative probabilities for supersymmetric models to
emerge from the landscape. The probabilities are related to the likelihood that
the derived value of the weak scale lies within the Agrawal et al. (ABDS)
allowed window of values leading to atoms as we know them. This then favors
natural SUSY models over unnatural (SUSY and other) models via a computable
probability measure.
| [
{
"created": "Wed, 29 Jun 2022 18:03:44 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Sep 2022 15:09:05 GMT",
"version": "v2"
}
] | 2022-09-28 | [
[
"Baer",
"Howard",
""
],
[
"Barger",
"Vernon",
""
],
[
"Martinez",
"Dakotah",
""
],
[
"Salam",
"Shadman",
""
]
] | A vast array of (metastable) vacuum solutions arise from string compactifications, each leading to different 4-d laws of physics. The space of these solutions, known as the string landscape, allows for an environmental solution to the cosmological constant problem. We examine the possibility of an environmental solution to the gauge hierarchy problem. We argue that the landscape favors softly broken supersymmetric models over particle physics models containing quadratic divergences, such as the Standard Model. We present a scheme for computing relative probabilities for supersymmetric models to emerge from the landscape. The probabilities are related to the likelihood that the derived value of the weak scale lies within the Agrawal et al. (ABDS) allowed window of values leading to atoms as we know them. This then favors natural SUSY models over unnatural (SUSY and other) models via a computable probability measure. |
hep-ph/0401120 | Anita Prapotnik | Svjetlana Fajfer (1 and 2), Tri Nang Pham (3), Anita Prapotnik (2)
((1) University of Ljubljana, Slovenia, (2) J. Stefan Institute, Slovenia,
(3) Centre de Physique Teorique, France) | The B^- -> phi phi K^- decay rate with phi phi invariant mass below
charm treshold | 14 pages, 4 figures, 2 tables | Phys.Rev. D69 (2004) 114020 | 10.1103/PhysRevD.69.114020 | null | hep-ph | null | We investigate the decay mechanism in the B^- -> phi phi K^- decay with the
phi phi invariant mass below the charm threshold and in the neighborhood of the
eta_c invariant mass region. Our approach is based on the use of factorization
model and the knowledge of matrix elements of the weak currents. For the B
meson weak transition we apply form factor formalism, while for the light
mesons we use effective weak and strong Lagrangians. We find that the dominant
contributions to the branching ratio come from the eta, eta' and eta(1490) pole
terms of the penguin operators in the decay chains B^- -> eta (eta', eta(1490))
K^- -> phi phi K^-. Our prediction for the branching ratio is in agreement with
the Belle's result.
| [
{
"created": "Fri, 16 Jan 2004 12:43:44 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Apr 2004 11:57:23 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Fajfer",
"Svjetlana",
"",
"1 and 2"
],
[
"Pham",
"Tri Nang",
""
],
[
"Prapotnik",
"Anita",
""
]
] | We investigate the decay mechanism in the B^- -> phi phi K^- decay with the phi phi invariant mass below the charm threshold and in the neighborhood of the eta_c invariant mass region. Our approach is based on the use of factorization model and the knowledge of matrix elements of the weak currents. For the B meson weak transition we apply form factor formalism, while for the light mesons we use effective weak and strong Lagrangians. We find that the dominant contributions to the branching ratio come from the eta, eta' and eta(1490) pole terms of the penguin operators in the decay chains B^- -> eta (eta', eta(1490)) K^- -> phi phi K^-. Our prediction for the branching ratio is in agreement with the Belle's result. |
1506.00665 | Diptimoy Ghosh | Genevieve Belanger, Diptimoy Ghosh, Rohini Godbole, Suchita Kulkarni | Light stop in the MSSM after LHC Run 1 | 54 pages, minor changes in the text, to appear in JHEP | null | null | LAPTH-030/15, LPSC15132, HEPHY-PUB 953/15 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The discovery of a Higgs boson with a mass of 126 GeV at the LHC when
combined with the non-observation of new physics both in direct and indirect
searches imposes strong constraints on supersymmetric models and in particular
on the top squark sector. The experiments for direct detection of dark matter
have provided with yet more constraints on the neutralino LSP mass and its
interactions. After imposing limits from the Higgs, flavour and dark matter
sectors, we examine the feasibility for a light stop in the context of the
pMSSM, in light of current results for stop and other SUSY searches at the LHC.
We only require that the neutralino dark matter explains a fraction of the
cosmologically measured dark matter abundance. We find that a stop with mass
below $\sim$ 500 GeV is still allowed. We further study various probes of the
light stop scenario that could be performed at the LHC Run - II either through
direct searches for the light and heavy stop, or SUSY searches not currently
available in simplified model results. Moreover we study the characteristics of
heavy Higgs for the points in the parameter space allowed by all the available
constraints and illustrate the region with large cross sections to fermionic or
electroweakino channels. Finally we show that nearly all scenarios with a small
stop$-$LSP mass difference will be tested by Xenon1T provided the NLSP is a
chargino, thus probing a region hard to access at the LHC.
| [
{
"created": "Mon, 1 Jun 2015 20:23:48 GMT",
"version": "v1"
},
{
"created": "Sat, 26 Sep 2015 06:14:43 GMT",
"version": "v2"
}
] | 2015-09-29 | [
[
"Belanger",
"Genevieve",
""
],
[
"Ghosh",
"Diptimoy",
""
],
[
"Godbole",
"Rohini",
""
],
[
"Kulkarni",
"Suchita",
""
]
] | The discovery of a Higgs boson with a mass of 126 GeV at the LHC when combined with the non-observation of new physics both in direct and indirect searches imposes strong constraints on supersymmetric models and in particular on the top squark sector. The experiments for direct detection of dark matter have provided with yet more constraints on the neutralino LSP mass and its interactions. After imposing limits from the Higgs, flavour and dark matter sectors, we examine the feasibility for a light stop in the context of the pMSSM, in light of current results for stop and other SUSY searches at the LHC. We only require that the neutralino dark matter explains a fraction of the cosmologically measured dark matter abundance. We find that a stop with mass below $\sim$ 500 GeV is still allowed. We further study various probes of the light stop scenario that could be performed at the LHC Run - II either through direct searches for the light and heavy stop, or SUSY searches not currently available in simplified model results. Moreover we study the characteristics of heavy Higgs for the points in the parameter space allowed by all the available constraints and illustrate the region with large cross sections to fermionic or electroweakino channels. Finally we show that nearly all scenarios with a small stop$-$LSP mass difference will be tested by Xenon1T provided the NLSP is a chargino, thus probing a region hard to access at the LHC. |
1403.3988 | Jenifer Nebreda | J. Nebreda, J. T. Londergan, J. R. Pelaez and A. P. Szczepaniak | Non-ordinary nature of the f_0(500) resonance from its Regge trajectory | 5 pages, 2 figures, to appear in the proceedings of the "XV
International Conference on Hadron Spectroscopy-Hadron 2013". arXiv admin
note: substantial text overlap with arXiv:1403.2790 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We report our results on how to obtain the Regge trajectory of a resonance
from its pole in a scattering process by imposing analytic constraints in the
complex angular momentum plane. The method, suited for resonances that dominate
an elastic scattering amplitude, has been applied to the {\rho}(770) and the
f_0(500) resonances. Whereas for the former we obtain a linear Regge
trajectory, characteristic of ordinary quark-antiquark states, for the latter
we find a non-linear trajectory with a much smaller slope at the resonance
mass. Moreover, we show that if a linear trajectory with a slope of typical
size is imposed for the f_0(500), the corresponding amplitude is at odds with
the data. This provides a strong indication of the non-ordinary nature of the
sigma meson.
| [
{
"created": "Mon, 17 Mar 2014 02:38:44 GMT",
"version": "v1"
}
] | 2014-03-18 | [
[
"Nebreda",
"J.",
""
],
[
"Londergan",
"J. T.",
""
],
[
"Pelaez",
"J. R.",
""
],
[
"Szczepaniak",
"A. P.",
""
]
] | We report our results on how to obtain the Regge trajectory of a resonance from its pole in a scattering process by imposing analytic constraints in the complex angular momentum plane. The method, suited for resonances that dominate an elastic scattering amplitude, has been applied to the {\rho}(770) and the f_0(500) resonances. Whereas for the former we obtain a linear Regge trajectory, characteristic of ordinary quark-antiquark states, for the latter we find a non-linear trajectory with a much smaller slope at the resonance mass. Moreover, we show that if a linear trajectory with a slope of typical size is imposed for the f_0(500), the corresponding amplitude is at odds with the data. This provides a strong indication of the non-ordinary nature of the sigma meson. |
0704.3258 | Rabindra N. Mohapatra | R. N. Mohapatra, N. Okada and Hai-Bo Yu | Natural Realizations of Seesaw in Mini-Warped Minimal SO(10) | 20 pages and one figure | Phys.Rev.D76:015013,2007 | 10.1103/PhysRevD.76.015013 | UMD-PP-07-003 | hep-ph | null | The minimal SUSY SO(10) GUT models with {\bf 10}, {\bf 126} and {\bf 210}
Higgs and only renormalizable couplings has been shown to provide a simple way
to understand the neutrino mixings as well as the ratio $\Delta
m^2_\odot/\Delta m^2_A$ in terms of quark mixing parameter $\theta_{Cabibbo}$,
provided neutrino masses are described by type II seesaw formula. However, in
this minimal picture, it is impossible to realize type II dominance with
renormalizable couplings in 4-dimensions. We show that this problem can be
cured by embedding this model into a warped 5-dimensional space time with
warping between the Planck and the GUT scale, where both type II as well as
mixed seesaw formulae can be realized in a natural manner without expanding the
Higgs sector. These models also avoid the possible problem of threshold effects
associated with large Higgs representations since the theory above the GUT
scale is now strongly coupled.
| [
{
"created": "Tue, 24 Apr 2007 18:37:19 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Mohapatra",
"R. N.",
""
],
[
"Okada",
"N.",
""
],
[
"Yu",
"Hai-Bo",
""
]
] | The minimal SUSY SO(10) GUT models with {\bf 10}, {\bf 126} and {\bf 210} Higgs and only renormalizable couplings has been shown to provide a simple way to understand the neutrino mixings as well as the ratio $\Delta m^2_\odot/\Delta m^2_A$ in terms of quark mixing parameter $\theta_{Cabibbo}$, provided neutrino masses are described by type II seesaw formula. However, in this minimal picture, it is impossible to realize type II dominance with renormalizable couplings in 4-dimensions. We show that this problem can be cured by embedding this model into a warped 5-dimensional space time with warping between the Planck and the GUT scale, where both type II as well as mixed seesaw formulae can be realized in a natural manner without expanding the Higgs sector. These models also avoid the possible problem of threshold effects associated with large Higgs representations since the theory above the GUT scale is now strongly coupled. |
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