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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1205.5648 | Dong Phung Van | P. V. Dong, H. T. Hung, H. N. Long | Question of Peccei-Quinn symmetry and quark masses in the economical
3-3-1 model | 25 pages, 4 figures, revised version, to appear in Physical Review D | Phys. Rev. D 86, 033002 (2012) | 10.1103/PhysRevD.86.033002 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that there is an infinite number of U(1) symmetries like Peccei-Quinn
symmetry in the 3-3-1 model with minimal scalar sector---two scalar triplets.
Moreover, all of them are completely broken due to the model's scalars by
themselves (notice that these scalars as known have been often used to break
the gauge symmetry and generating the masses for the model's particles). There
is no any residual Peccei-Quinn symmetry. Because of the minimal scalar content
there are some quarks that are massless at tree-level, but they can get
consistent mass contributions at one-loop due to this fact. Interestingly,
axions as associated with the mentioned U(1)s breaking (including Majoron due
to lepton-charge breaking) are all gauged away because they are also the
Goldstone bosons responsible for the gauge symmetry breaking as usual.
| [
{
"created": "Fri, 25 May 2012 09:36:28 GMT",
"version": "v1"
},
{
"created": "Thu, 12 Jul 2012 11:16:24 GMT",
"version": "v2"
}
] | 2012-08-06 | [
[
"Dong",
"P. V.",
""
],
[
"Hung",
"H. T.",
""
],
[
"Long",
"H. N.",
""
]
] | We show that there is an infinite number of U(1) symmetries like Peccei-Quinn symmetry in the 3-3-1 model with minimal scalar sector---two scalar triplets. Moreover, all of them are completely broken due to the model's scalars by themselves (notice that these scalars as known have been often used to break the gauge symmetry and generating the masses for the model's particles). There is no any residual Peccei-Quinn symmetry. Because of the minimal scalar content there are some quarks that are massless at tree-level, but they can get consistent mass contributions at one-loop due to this fact. Interestingly, axions as associated with the mentioned U(1)s breaking (including Majoron due to lepton-charge breaking) are all gauged away because they are also the Goldstone bosons responsible for the gauge symmetry breaking as usual. |
2009.01262 | Rishav Roshan | Amit Dutta Banik, Rishav Roshan, Arunansu Sil | Two Component Singlet-Triplet Scalar Dark Matter and Electroweak Vacuum
Stability | 38 pages, 13 figures, 4 tables (Accepted in PRD) | Phys. Rev. D 103, 075001 (2021) | 10.1103/PhysRevD.103.075001 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We propose a two component dark matter set-up by extending the Standard Model
with a singlet and a hypercharge-less triplet scalars, each of them being odd
under different $Z_2$ symmetries. We observe that the inter-conversion between
the two dark matter components allow a viable parameter space where masses of
both the dark matter candidates can be below TeV, even though their individual
contribution to single component dark matter rules out any such sub-TeV dark
matter. We find that a lighter mass of the neutral component of the scalar
triplet, playing the role of one dark matter component, compared to the scalar
one is favored. In addition, the set-up is shown to make the electroweak vacuum
absolutely stable till the Planck scale, thanks to Higgs portal coupling with
the scalar dark matter components.
| [
{
"created": "Wed, 2 Sep 2020 18:01:04 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Mar 2021 06:25:34 GMT",
"version": "v2"
}
] | 2021-04-07 | [
[
"Banik",
"Amit Dutta",
""
],
[
"Roshan",
"Rishav",
""
],
[
"Sil",
"Arunansu",
""
]
] | We propose a two component dark matter set-up by extending the Standard Model with a singlet and a hypercharge-less triplet scalars, each of them being odd under different $Z_2$ symmetries. We observe that the inter-conversion between the two dark matter components allow a viable parameter space where masses of both the dark matter candidates can be below TeV, even though their individual contribution to single component dark matter rules out any such sub-TeV dark matter. We find that a lighter mass of the neutral component of the scalar triplet, playing the role of one dark matter component, compared to the scalar one is favored. In addition, the set-up is shown to make the electroweak vacuum absolutely stable till the Planck scale, thanks to Higgs portal coupling with the scalar dark matter components. |
hep-ph/0506129 | Martin Lemoine | Karsten Jedamzik (LPTA), Martin Lemoine (IAP), Gilbert Moultaka (LPTA) | Gravitino dark matter in gauge mediated supersymmetry breaking | 21 pages, 5 figures ; matches published version | Phys.Rev. D73 (2006) 043514 | 10.1103/PhysRevD.73.043514 | null | hep-ph astro-ph hep-th | null | This paper investigates the parameter space of theories with gauge mediated
supersymmetry breaking leading to gravitino (cold) dark matter with mass
m_{3/2}= 1keV - 10MeV. We pay particular attention to the cosmological role of
messenger fields. Cosmology requires that these messengers decay to the visible
sector if the lightest messenger mass M_X > 30TeV. We then examine the various
possible messenger number violating interactions allowed by the symmetries of
the theory and by phenomenology. Late messenger decay generally results in
entropy production hence in the dilution of pre-existing gravitinos. We find
that in SU(5) grand unification only specific messenger-matter couplings allow
to produce the required amount of gravitino dark matter particles. Gravitino
dark matter with the correct abundance is however expected in larger gauge
groups such as SO(10) for generic non-renormalizable messenger-matter
interactions and for arbritrarily high post-inflationary reheating
temperatures.
| [
{
"created": "Tue, 14 Jun 2005 07:42:46 GMT",
"version": "v1"
},
{
"created": "Tue, 9 May 2006 14:44:55 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Jedamzik",
"Karsten",
"",
"LPTA"
],
[
"Lemoine",
"Martin",
"",
"IAP"
],
[
"Moultaka",
"Gilbert",
"",
"LPTA"
]
] | This paper investigates the parameter space of theories with gauge mediated supersymmetry breaking leading to gravitino (cold) dark matter with mass m_{3/2}= 1keV - 10MeV. We pay particular attention to the cosmological role of messenger fields. Cosmology requires that these messengers decay to the visible sector if the lightest messenger mass M_X > 30TeV. We then examine the various possible messenger number violating interactions allowed by the symmetries of the theory and by phenomenology. Late messenger decay generally results in entropy production hence in the dilution of pre-existing gravitinos. We find that in SU(5) grand unification only specific messenger-matter couplings allow to produce the required amount of gravitino dark matter particles. Gravitino dark matter with the correct abundance is however expected in larger gauge groups such as SO(10) for generic non-renormalizable messenger-matter interactions and for arbritrarily high post-inflationary reheating temperatures. |
hep-ph/9606255 | null | B.Kerbikov, S.V.Bashinsky | $K\bar{K}$ Threshold Phenomena, $f_0-a_0$ Interference and Kaonium
Production | 2 pages; to appear in the proceedings of the XIV Int. Conf. on
Particle and Nuclei, Williamsburg, May 22-28, 1996 | null | null | null | hep-ph | null | We develop a new formalism to study $K\bar{K}$ threshold phenomena with
resonances $f_0$, $a_0$ and $K^+K^-$ atom (kaonium) included. The approach
provides two possible scenarios for $f_0-a_0$ mixing. Drastic interference
patterns can be observed in $K^+K^-$electroproduction at CEBAF, $pd\to ~^3HeX$
reaction, and $N\bar N$ annihilation.
| [
{
"created": "Thu, 6 Jun 1996 14:28:26 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kerbikov",
"B.",
""
],
[
"Bashinsky",
"S. V.",
""
]
] | We develop a new formalism to study $K\bar{K}$ threshold phenomena with resonances $f_0$, $a_0$ and $K^+K^-$ atom (kaonium) included. The approach provides two possible scenarios for $f_0-a_0$ mixing. Drastic interference patterns can be observed in $K^+K^-$electroproduction at CEBAF, $pd\to ~^3HeX$ reaction, and $N\bar N$ annihilation. |
1505.04191 | Sebastian Ellis | Sebastian A. R. Ellis and Gordon L. Kane | Lepton Flavour Violation via the K\"ahler Potential in Compactified
M-Theory | 32 pages, 7 figures | null | null | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use lepton-flavour violating (LFV) processes as a probe of higher-order
corrections to the K\"ahler potential in compactified M-theory. We consider a
generic K\"ahler potential with higher-order terms coupling visible sector
fields to fields in the hidden sector of the compactified theory. Such terms
generally give rise to potentially large flavour-violating effects. Unless
there are suppressions, the size of the resulting off-diagonal terms in the
K\"ahler potential may be at odds with experimental results. The rare decay
$\mu \to e \gamma$ and $\mu \to e$ conversion in nuclei probe the size of the
potential flavour non-diagonality of the higher-order terms for realistic
spectra in the M-theory compactification. We consider a parameterisation of the
higher-order corrections in terms of a small parameter $\epsilon$. By analysing
various textures for the higher-order corrections, we find current bounds on
$\epsilon$ from the LFV processes. The constraint from the neutral kaon mass
difference $\Delta m_K$ is currently similar to that from $\mu \to e \gamma$.
Measurement or new limits on the process $\mu \to e \gamma$ and, in the future,
$\mu \to e$ conversion in Aluminium, will be an effective probe of the form of
the higher-order K\"ahler potential terms. For the preferred range of gravitino
masses, unless the K\"ahler potential is strikingly flavour-diagonal,
improvement in experimental sensitivity of LFV processes should give a non-zero
signal.
| [
{
"created": "Fri, 15 May 2015 20:00:30 GMT",
"version": "v1"
}
] | 2015-05-19 | [
[
"Ellis",
"Sebastian A. R.",
""
],
[
"Kane",
"Gordon L.",
""
]
] | We use lepton-flavour violating (LFV) processes as a probe of higher-order corrections to the K\"ahler potential in compactified M-theory. We consider a generic K\"ahler potential with higher-order terms coupling visible sector fields to fields in the hidden sector of the compactified theory. Such terms generally give rise to potentially large flavour-violating effects. Unless there are suppressions, the size of the resulting off-diagonal terms in the K\"ahler potential may be at odds with experimental results. The rare decay $\mu \to e \gamma$ and $\mu \to e$ conversion in nuclei probe the size of the potential flavour non-diagonality of the higher-order terms for realistic spectra in the M-theory compactification. We consider a parameterisation of the higher-order corrections in terms of a small parameter $\epsilon$. By analysing various textures for the higher-order corrections, we find current bounds on $\epsilon$ from the LFV processes. The constraint from the neutral kaon mass difference $\Delta m_K$ is currently similar to that from $\mu \to e \gamma$. Measurement or new limits on the process $\mu \to e \gamma$ and, in the future, $\mu \to e$ conversion in Aluminium, will be an effective probe of the form of the higher-order K\"ahler potential terms. For the preferred range of gravitino masses, unless the K\"ahler potential is strikingly flavour-diagonal, improvement in experimental sensitivity of LFV processes should give a non-zero signal. |
hep-ph/0212104 | Alexei Nefediev | A.V.Nefediev (IST, Lisbon and ITEP, Moscow), J.E.F.T.Ribeiro (IST,
Lisbon) | Quantum field theory approach to the vacuum replica in QCD | LaTeX2e, 2 EPS figures, uses ws-procs9x6 (included) and epsfig
classes, Talk given at the conference "Quark Confinement and the Hadron
Spectrum V", 10-14 September 2002, Gargnano, Italy, to appear in Proceedings | null | 10.1142/9789812704269_0067 | null | hep-ph | null | Quantum field theory is used to describe the contribution of possible new QCD
vacuum replica to hadronic processes. This sigma-like new state has been
recently shown to be likely to appear for any realistic four-quark interaction
kernel as a consequence of chiral symmetry. The local operator creating the
replica vacuum state is constructed explicitly. Applications to physical
processes are outlined.
| [
{
"created": "Fri, 6 Dec 2002 17:15:13 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Nefediev",
"A. V.",
"",
"IST, Lisbon and ITEP, Moscow"
],
[
"Ribeiro",
"J. E. F. T.",
"",
"IST,\n Lisbon"
]
] | Quantum field theory is used to describe the contribution of possible new QCD vacuum replica to hadronic processes. This sigma-like new state has been recently shown to be likely to appear for any realistic four-quark interaction kernel as a consequence of chiral symmetry. The local operator creating the replica vacuum state is constructed explicitly. Applications to physical processes are outlined. |
hep-ph/9912390 | James Wells | Riccardo Rattazzi, Alessandro Strumia, James D. Wells | Phenomenology of deflected anomaly-mediation | 18 pages, latex, refs added | Nucl.Phys.B576:3-28,2000 | 10.1016/S0550-3213(00)00130-9 | IFUP-TH/54-99 and SNS-PH/99-16 and UCD-99-25 | hep-ph | null | We explore the phenomenology of a class of models with anomaly-mediated
supersymmetry breaking. These models retain the successful flavor properties of
the minimal scenario while avoiding the tachyons. The mass spectrum is
predicted in terms of a few parameters. However various qualitatively different
spectra are possible, often strongly different from the ones usually employed
to explore capabilities of new accelerators. One stable feature is the limited
spread of the spectrum, so that squarks and gluinos could be conceivably
produced at TEVII. The lightest superpartner of standard particles is often a
charged slepton or a neutral higgsino. It behaves as a stable particle in
collider experiments but it decays at or before nucleosynthesis. We identify
the experimental signatures at hadron colliders that can help distinguish this
scenario from the usual ones.
| [
{
"created": "Fri, 17 Dec 1999 18:00:41 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Dec 1999 00:02:16 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Rattazzi",
"Riccardo",
""
],
[
"Strumia",
"Alessandro",
""
],
[
"Wells",
"James D.",
""
]
] | We explore the phenomenology of a class of models with anomaly-mediated supersymmetry breaking. These models retain the successful flavor properties of the minimal scenario while avoiding the tachyons. The mass spectrum is predicted in terms of a few parameters. However various qualitatively different spectra are possible, often strongly different from the ones usually employed to explore capabilities of new accelerators. One stable feature is the limited spread of the spectrum, so that squarks and gluinos could be conceivably produced at TEVII. The lightest superpartner of standard particles is often a charged slepton or a neutral higgsino. It behaves as a stable particle in collider experiments but it decays at or before nucleosynthesis. We identify the experimental signatures at hadron colliders that can help distinguish this scenario from the usual ones. |
1804.10378 | Yong Tang | Takeo Moroi, Kazunori Nakayama and Yong Tang | Axion-Photon Conversion and Effects on 21cm Observation | 1+12 pages, 3 figures | null | 10.1016/j.physletb.2018.07.002 | UT-18-09 | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently the EDGES experiment reported an enhanced 21cm absorption signal in
the radio wave observation, which may be interpreted as either anomalous
cooling of baryons or heating of cosmic microwave background photons. In this
paper, we pursue the latter possibility. We point out that dark radiation
consisting of axion-like particles can resonantly convert into photons under
the intergalactic magnetic field, which can effectively heat up the radiation
in the frequency range relevant for the EDGES experiment. This may explain the
EDGES anomaly.
| [
{
"created": "Fri, 27 Apr 2018 08:13:36 GMT",
"version": "v1"
},
{
"created": "Sun, 8 Jul 2018 01:27:16 GMT",
"version": "v2"
}
] | 2018-07-10 | [
[
"Moroi",
"Takeo",
""
],
[
"Nakayama",
"Kazunori",
""
],
[
"Tang",
"Yong",
""
]
] | Recently the EDGES experiment reported an enhanced 21cm absorption signal in the radio wave observation, which may be interpreted as either anomalous cooling of baryons or heating of cosmic microwave background photons. In this paper, we pursue the latter possibility. We point out that dark radiation consisting of axion-like particles can resonantly convert into photons under the intergalactic magnetic field, which can effectively heat up the radiation in the frequency range relevant for the EDGES experiment. This may explain the EDGES anomaly. |
hep-ph/9904201 | null | Tatsuo Kobayashi, Jisuke Kubo, Hitoshi Shimabukuro | Electroweak symmetry breaking and s-spectrum in M-theory | 34 pages, 24 figures | Nucl.Phys. B580 (2000) 3-28 | 10.1016/S0550-3213(00)00138-3 | HIP-1999-14/TH and KANAZAWA-99-05 | hep-ph hep-th | null | We study soft SUSY breaking parameters in M-theory with and without 5-brane
moduli fields. We investigate successful electroweak symmetry breaking and the
positivity of stau mass squared. We study mass spectra in allowed regions.
| [
{
"created": "Thu, 1 Apr 1999 04:52:08 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Kobayashi",
"Tatsuo",
""
],
[
"Kubo",
"Jisuke",
""
],
[
"Shimabukuro",
"Hitoshi",
""
]
] | We study soft SUSY breaking parameters in M-theory with and without 5-brane moduli fields. We investigate successful electroweak symmetry breaking and the positivity of stau mass squared. We study mass spectra in allowed regions. |
0811.2901 | Kirill Semenov-Tian-Shansky | Maxim V. Polyakov and Kirill M. Semenov-Tian-Shansky | Dual parametrization of GPDs versus the double distribution Ansatz | 18 pages, 5 figures. A version that appeared in Eur. Phys. J. A. Some
of the statements were refined and misprints in the formulas were corrected | Eur.Phys.J.A40:181-198,2009 | 10.1140/epja/i2008-10759-2 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We establish a link between the dual parametrization of GPDs and a popular
parametrization based on the double distribution Ansatz, which is in prevalent
use in phenomenological applications. We compute several first forward-like
functions that express the double distribution Ansatz for GPDs in the framework
of the dual parametrization and show that these forward-like functions make the
dominant contribution into the GPD quintessence function. We also argue that
the forward-like functions $Q_{2 \nu}(x)$ with $\nu \ge 1$ contribute to the
leading singular small-$x_{Bj}$ behavior of the imaginary part of DVCS
amplitude. This makes the small-$x_{Bj}$ behavior of $\im A^{DVCS}$ independent
of the asymptotic behavior of PDFs. Assuming analyticity of Mellin moments of
GPDs in the Mellin space we are able to fix the value of the $D$-form factor in
terms of the GPD quintessence function $N(x,t)$ and the forward-like function
$Q_0(x,t)$.
| [
{
"created": "Tue, 18 Nov 2008 13:53:41 GMT",
"version": "v1"
},
{
"created": "Sun, 31 May 2009 09:29:31 GMT",
"version": "v2"
}
] | 2011-04-12 | [
[
"Polyakov",
"Maxim V.",
""
],
[
"Semenov-Tian-Shansky",
"Kirill M.",
""
]
] | We establish a link between the dual parametrization of GPDs and a popular parametrization based on the double distribution Ansatz, which is in prevalent use in phenomenological applications. We compute several first forward-like functions that express the double distribution Ansatz for GPDs in the framework of the dual parametrization and show that these forward-like functions make the dominant contribution into the GPD quintessence function. We also argue that the forward-like functions $Q_{2 \nu}(x)$ with $\nu \ge 1$ contribute to the leading singular small-$x_{Bj}$ behavior of the imaginary part of DVCS amplitude. This makes the small-$x_{Bj}$ behavior of $\im A^{DVCS}$ independent of the asymptotic behavior of PDFs. Assuming analyticity of Mellin moments of GPDs in the Mellin space we are able to fix the value of the $D$-form factor in terms of the GPD quintessence function $N(x,t)$ and the forward-like function $Q_0(x,t)$. |
hep-ph/0107320 | Yangmz | Dong-Sheng Du, Chao-Shang Huang, Zheng-Tao Wei, Mao-Zhi Yang | Sudakov effects in BBNS approach | 16 pages, Latex, two figures, some typos corrected | Phys.Lett. B520 (2001) 50-58; Erratum-ibid. B530 (2002) 258 | 10.1016/S0370-2693(01)01118-2 | null | hep-ph | null | The end-point singularity is an unsolved problem in BBNS approach.
Incorporating the partonic transverse momentum and the Sudakov form factor,
this problem can be solved model-independently. We discuss the Sudakov effects
in BBNS approach. The BBNS approach is compared with the modified PQCD
approach. The main idea of Sudakov form factor is briefly discussed. Our
conclusion is that the twist-3 contribution for the hard spectator scattering
is numerically not important in $B\to \pi\pi$ decays, compared with the twist-2
contribution.
| [
{
"created": "Tue, 31 Jul 2001 12:06:20 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Feb 2002 04:16:08 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Du",
"Dong-Sheng",
""
],
[
"Huang",
"Chao-Shang",
""
],
[
"Wei",
"Zheng-Tao",
""
],
[
"Yang",
"Mao-Zhi",
""
]
] | The end-point singularity is an unsolved problem in BBNS approach. Incorporating the partonic transverse momentum and the Sudakov form factor, this problem can be solved model-independently. We discuss the Sudakov effects in BBNS approach. The BBNS approach is compared with the modified PQCD approach. The main idea of Sudakov form factor is briefly discussed. Our conclusion is that the twist-3 contribution for the hard spectator scattering is numerically not important in $B\to \pi\pi$ decays, compared with the twist-2 contribution. |
1407.8544 | Thomas W. Kephart | Paul H. Frampton and Thomas W. Kephart | Sum Rule Constraint on Models Beyond the Standard Model | 11 pages, 1 figure; minor edits in version 2 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In most versions of beyond the standard model (BSM) physics, the Yukawa
couplings of the quarks and charged leptons are not all to the same complex
scalar doublet but to different ones. Comparison to the standard model (SM)
with only one scalar doublet, using the known mass of the W boson, provides a
sum rule constraint on the Yukawa couplings $Y_i,~~ i=t, b, \tau,.....$ of the
form $\Sigma_i r_i^2 = 1$ where $r_i = Y_i^{(SM)}/Y_i^{(BSM)}$ and the sum is
over distinct scalar doublets. The LHC data on the branching ratios $H
\rightarrow \gamma\gamma, ~\bar{b}b, ~\tau^+\tau^-, ~etc.,$ allows detailed
comparison to this sum rule constraint and, as accuracy improves, will
constrain or exclude many BSM theories.
| [
{
"created": "Thu, 31 Jul 2014 19:47:04 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Aug 2015 15:44:00 GMT",
"version": "v2"
}
] | 2015-08-14 | [
[
"Frampton",
"Paul H.",
""
],
[
"Kephart",
"Thomas W.",
""
]
] | In most versions of beyond the standard model (BSM) physics, the Yukawa couplings of the quarks and charged leptons are not all to the same complex scalar doublet but to different ones. Comparison to the standard model (SM) with only one scalar doublet, using the known mass of the W boson, provides a sum rule constraint on the Yukawa couplings $Y_i,~~ i=t, b, \tau,.....$ of the form $\Sigma_i r_i^2 = 1$ where $r_i = Y_i^{(SM)}/Y_i^{(BSM)}$ and the sum is over distinct scalar doublets. The LHC data on the branching ratios $H \rightarrow \gamma\gamma, ~\bar{b}b, ~\tau^+\tau^-, ~etc.,$ allows detailed comparison to this sum rule constraint and, as accuracy improves, will constrain or exclude many BSM theories. |
1703.08329 | Takumi Kuwahara | Junji Hisano, Takumi Kuwahara, Yuji Omura, and Takeki Sato | Two-loop Anomalous Dimensions for Four-Fermi Operators in Supersymmetric
Theories | 20 pages, Version accepted for publication in Nuclear Physics B | Nuclear Physics B 922C (2017) pp. 77-93 | 10.1016/j.nuclphysb.2017.06.021 | IPMU17-0043 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive two-loop anomalous dimensions for four-Fermi operators in
supersymmetric theories using the effective Kahler potential. We introduce the
general forms in generic gauge theories and apply our results to the
flavor-changing operators in (minimal) supersymmetric standard models.
| [
{
"created": "Fri, 24 Mar 2017 09:45:14 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Jul 2017 08:46:01 GMT",
"version": "v2"
}
] | 2017-07-13 | [
[
"Hisano",
"Junji",
""
],
[
"Kuwahara",
"Takumi",
""
],
[
"Omura",
"Yuji",
""
],
[
"Sato",
"Takeki",
""
]
] | We derive two-loop anomalous dimensions for four-Fermi operators in supersymmetric theories using the effective Kahler potential. We introduce the general forms in generic gauge theories and apply our results to the flavor-changing operators in (minimal) supersymmetric standard models. |
hep-ph/0404051 | Takashi Inoue | T. Inoue, V. E. Lyubovitskij, Th. Gutsche and Amand Faessler | Ground-state baryon masses in the perturbative chiral quark model | 24 pages, 3 figures | Int.J.Mod.Phys. E15 (2006) 121-142 | 10.1142/S0218301306003862 | null | hep-ph nucl-th | null | Mass differences of the flavor octet and decuplet ground-state baryons are
studied in the perturbative chiral quark model. We present a way to understand
the nontrivial spin- and flavor dependent mass differences, where both
pseudoscalar mesons and gluons play a significant role.
| [
{
"created": "Tue, 6 Apr 2004 09:36:50 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Inoue",
"T.",
""
],
[
"Lyubovitskij",
"V. E.",
""
],
[
"Gutsche",
"Th.",
""
],
[
"Faessler",
"Amand",
""
]
] | Mass differences of the flavor octet and decuplet ground-state baryons are studied in the perturbative chiral quark model. We present a way to understand the nontrivial spin- and flavor dependent mass differences, where both pseudoscalar mesons and gluons play a significant role. |
0901.1106 | Pierre Sikivie | P. Sikivie and Q. Yang | Bose-Einstein Condensation of Dark Matter Axions | 4 pages. Three typos are corrected. Version to be published by
Physical Review Letters | Phys.Rev.Lett.103:111301,2009 | 10.1103/PhysRevLett.103.111301 | UFIFT-HEP-09-1 | hep-ph astro-ph.CO cond-mat.stat-mech | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that cold dark matter axions thermalize and form a Bose-Einstein
condensate. We obtain the axion state in a homogeneous and isotropic universe,
and derive the equations governing small axion perturbations. Because they form
a BEC, axions differ from ordinary cold dark matter in the non-linear regime of
structure formation and upon entering the horizon. Axion BEC provides a
mechanism for the production of net overall rotation in dark matter halos, and
for the alignment of cosmic microwave anisotropy multipoles.
| [
{
"created": "Thu, 8 Jan 2009 18:44:45 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Jan 2009 17:04:50 GMT",
"version": "v2"
},
{
"created": "Wed, 29 Jul 2009 21:05:54 GMT",
"version": "v3"
},
{
"created": "Wed, 2 Sep 2009 20:15:05 GMT",
"version": "v4"
}
] | 2009-11-06 | [
[
"Sikivie",
"P.",
""
],
[
"Yang",
"Q.",
""
]
] | We show that cold dark matter axions thermalize and form a Bose-Einstein condensate. We obtain the axion state in a homogeneous and isotropic universe, and derive the equations governing small axion perturbations. Because they form a BEC, axions differ from ordinary cold dark matter in the non-linear regime of structure formation and upon entering the horizon. Axion BEC provides a mechanism for the production of net overall rotation in dark matter halos, and for the alignment of cosmic microwave anisotropy multipoles. |
hep-ph/0606246 | Danny Marfatia | S. Hussain, D. Marfatia, D. W. McKay, D. Seckel | Cross section dependence of event rates at neutrino telescopes | 4 pages, 2 figures. Version to appear in PRL | Phys.Rev.Lett. 97 (2006) 161101 | 10.1103/PhysRevLett.97.161101 | null | hep-ph astro-ph hep-ex | null | We examine the dependence of event rates at neutrino telescopes on the
neutrino-nucleon cross section for neutrinos with energy above 1 PeV, and
contrast the results with those for cosmic ray experiments. Simple scaling of
the Standard Model cross sections leaves the rates of upward events essentially
unchanged. Details, such as detector depth and cross section inelasticity, can
influence rates. Numerical estimates of upward shower, muon and tau event rates
in the IceCube detector confirm these results.
| [
{
"created": "Thu, 22 Jun 2006 20:00:05 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Sep 2006 03:46:56 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Hussain",
"S.",
""
],
[
"Marfatia",
"D.",
""
],
[
"McKay",
"D. W.",
""
],
[
"Seckel",
"D.",
""
]
] | We examine the dependence of event rates at neutrino telescopes on the neutrino-nucleon cross section for neutrinos with energy above 1 PeV, and contrast the results with those for cosmic ray experiments. Simple scaling of the Standard Model cross sections leaves the rates of upward events essentially unchanged. Details, such as detector depth and cross section inelasticity, can influence rates. Numerical estimates of upward shower, muon and tau event rates in the IceCube detector confirm these results. |
1307.6840 | Gilberto Ramalho | G. Ramalho and K. Tsushima | What is the role of the meson cloud in the $\Sigma^{*0} \to \gamma
\Lambda$ and $\Sigma^\ast \to \gamma \Sigma$ decays? | Published in Phys.Rev.D. 14 pages, 1 figure, 6 tables. Minor
corrections | Phys. Rev. D 88, 053002 (2013) | 10.1103/PhysRevD.88.053002 | null | hep-ph hep-ex hep-lat nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the effect of the meson cloud dressing in the octet baryon to
decuplet baryon electromagnetic transitions. Combining the valence quark
contributions from the covariant spectator quark model with those of the meson
cloud estimated based on the flavor SU(3) cloudy bag model, we calculate the
transition magnetic form factors at $Q^2=0$ ($Q^2=-q^2$ and $q$ the
four-momentum transfer), and also the decuplet baryon electromagnetic decay
widths. The result for the $\gamma^\ast \Lambda \to \Sigma^{\ast 0}$ decay
width is in complete agreement with the data, while that for the $\gamma^\ast
\Sigma^+ \to \Sigma^{\ast +}$ is underestimated the data by 1.4 standard
deviations. This achievement may be regarded as a significant advance in the
present theoretical situation.
| [
{
"created": "Thu, 25 Jul 2013 18:53:57 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Sep 2013 16:02:15 GMT",
"version": "v2"
}
] | 2013-09-09 | [
[
"Ramalho",
"G.",
""
],
[
"Tsushima",
"K.",
""
]
] | We study the effect of the meson cloud dressing in the octet baryon to decuplet baryon electromagnetic transitions. Combining the valence quark contributions from the covariant spectator quark model with those of the meson cloud estimated based on the flavor SU(3) cloudy bag model, we calculate the transition magnetic form factors at $Q^2=0$ ($Q^2=-q^2$ and $q$ the four-momentum transfer), and also the decuplet baryon electromagnetic decay widths. The result for the $\gamma^\ast \Lambda \to \Sigma^{\ast 0}$ decay width is in complete agreement with the data, while that for the $\gamma^\ast \Sigma^+ \to \Sigma^{\ast +}$ is underestimated the data by 1.4 standard deviations. This achievement may be regarded as a significant advance in the present theoretical situation. |
1302.1496 | Frans Klinkhamer | F.R. Klinkhamer | Standard Model Higgs field and energy scale of gravity | v5: published version | JETP Letters 97, 297 (2013) | 10.1134/S002136401306009X | KA-TP-03-2013 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The effective potential of the Higgs scalar field in the Standard Model may
have a second degenerate minimum at an ultrahigh vacuum expectation value. This
second minimum then determines, by radiative corrections, the values of the
top-quark and Higgs-boson masses at the standard minimum corresponding to the
electroweak energy scale. An argument is presented that this ultrahigh vacuum
expectation value is proportional to the energy scale of gravity, E_{Planck}
\equiv \sqrt{\hbar c^5/G_N}, considered to be characteristic of a spacetime
foam. In the context of a simple model, the existence of kink-type wormhole
solutions places a lower bound on the ultrahigh vacuum expectation value and
this lower bound is of the order of E_{Planck}.
| [
{
"created": "Wed, 6 Feb 2013 20:10:44 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Feb 2013 19:58:37 GMT",
"version": "v2"
},
{
"created": "Thu, 14 Feb 2013 20:11:24 GMT",
"version": "v3"
},
{
"created": "Tue, 26 Feb 2013 16:30:01 GMT",
"version": "v4"
},
{
"created": "Thu, 25 Apr 2013 14:26:51 GMT",
"version": "v5"
}
] | 2015-06-12 | [
[
"Klinkhamer",
"F. R.",
""
]
] | The effective potential of the Higgs scalar field in the Standard Model may have a second degenerate minimum at an ultrahigh vacuum expectation value. This second minimum then determines, by radiative corrections, the values of the top-quark and Higgs-boson masses at the standard minimum corresponding to the electroweak energy scale. An argument is presented that this ultrahigh vacuum expectation value is proportional to the energy scale of gravity, E_{Planck} \equiv \sqrt{\hbar c^5/G_N}, considered to be characteristic of a spacetime foam. In the context of a simple model, the existence of kink-type wormhole solutions places a lower bound on the ultrahigh vacuum expectation value and this lower bound is of the order of E_{Planck}. |
1511.06371 | Vedran Brdar | Vedran Brdar, Matthias K\"onig, Joachim Kopp (Johannes Gutenberg
University Mainz) | Neutrino Anarchy and Renormalization Group Evolution | 23 pages, 12 figures. v2: References added, matches version to be
published in PRD | Phys. Rev. D 93, 093010 (2016) | 10.1103/PhysRevD.93.093010 | MITP/15-104 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The observed pattern of neutrino mixing angles is in good agreement with the
hypothesis of neutrino anarchy, which posits that Nature has chosen the entries
of the leptonic mixing matrix at random. In this paper we investigate how
stable this conclusion is under renormalization group effects. Working in the
simplest type-I seesaw model and two variants of the inverse seesaw model we
study how the statistical distributions of the neutrino mixing parameters
evolve between the Grand Unification scale and the electroweak scale.
Especially in the inverse seesaw case we find significant distortions: mixing
angles tend to be smaller after RG running, and the Dirac CP phase tends to be
closer to zero. The p-value describing the compatibility between the observed
mixing angles and the anarchy hypothesis increases by 10-20%. This illustrates
that RG effects are highly relevant for quantitative studies of the anarchy
scenario.
| [
{
"created": "Thu, 19 Nov 2015 21:00:02 GMT",
"version": "v1"
},
{
"created": "Wed, 25 May 2016 22:44:47 GMT",
"version": "v2"
}
] | 2016-05-27 | [
[
"Brdar",
"Vedran",
"",
"Johannes Gutenberg\n University Mainz"
],
[
"König",
"Matthias",
"",
"Johannes Gutenberg\n University Mainz"
],
[
"Kopp",
"Joachim",
"",
"Johannes Gutenberg\n University Mainz"
]
] | The observed pattern of neutrino mixing angles is in good agreement with the hypothesis of neutrino anarchy, which posits that Nature has chosen the entries of the leptonic mixing matrix at random. In this paper we investigate how stable this conclusion is under renormalization group effects. Working in the simplest type-I seesaw model and two variants of the inverse seesaw model we study how the statistical distributions of the neutrino mixing parameters evolve between the Grand Unification scale and the electroweak scale. Especially in the inverse seesaw case we find significant distortions: mixing angles tend to be smaller after RG running, and the Dirac CP phase tends to be closer to zero. The p-value describing the compatibility between the observed mixing angles and the anarchy hypothesis increases by 10-20%. This illustrates that RG effects are highly relevant for quantitative studies of the anarchy scenario. |
2009.01781 | Renan Pereira | Pedro Costa, Renan C\^amara Pereira, Constan\c{c}a Provid\^encia | Role of the conserved charges in the chiral symmetry restoration phase
transition | 8 pages, 4 figures | Phys. Rev. D 102, 054010 (2020) | 10.1103/PhysRevD.102.054010 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The effect of conserved baryon, isospin and strangeness charges on the
behavior of phase transitions in dense matter is studied. Baryonic matter is
described within the three-flavor Polyakov$-$Nambu$-$Jona-Lasinio model and
several charge fractions $Y_Q$ are considered. The role of the vector
interaction, which can be important to describe dense systems, is discussed.
Special attention is given to the case with charge fraction $Y_Q=0.4$, due to
its importance in heavy-ion collisions and core-collapse supernova matter. It
is shown that the possible formation of chiral-symmetric quark matter in the
laboratory will be favored in asymmetric matter. Besides, the inclusion of the
vector interaction reinforces the formation of quark matter at lower densities.
| [
{
"created": "Thu, 3 Sep 2020 16:39:43 GMT",
"version": "v1"
}
] | 2020-09-14 | [
[
"Costa",
"Pedro",
""
],
[
"Pereira",
"Renan Câmara",
""
],
[
"Providência",
"Constança",
""
]
] | The effect of conserved baryon, isospin and strangeness charges on the behavior of phase transitions in dense matter is studied. Baryonic matter is described within the three-flavor Polyakov$-$Nambu$-$Jona-Lasinio model and several charge fractions $Y_Q$ are considered. The role of the vector interaction, which can be important to describe dense systems, is discussed. Special attention is given to the case with charge fraction $Y_Q=0.4$, due to its importance in heavy-ion collisions and core-collapse supernova matter. It is shown that the possible formation of chiral-symmetric quark matter in the laboratory will be favored in asymmetric matter. Besides, the inclusion of the vector interaction reinforces the formation of quark matter at lower densities. |
0907.0205 | Florian Hahn-Woernle | F. Hahn-Woernle, M. Plumacher, Y.Y.Y. Wong | Full Boltzmann equations for leptogenesis including scattering | 39 pages, 8 figures, typos corrected, replaced to match published
version | JCAP 0908:028,2009 | 10.1088/1475-7516/2009/08/028 | CERN-PH-TH/2009-107, MPP-2009-85, PITHA 09/15 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the evolution of a cosmological baryon asymmetry produced via
leptogenesis by means of the full classical Boltzmann equations, without the
assumption of kinetic equilibrium and including all quantum statistical
factors. Beginning with the full mode equations we derive the usual equations
of motion for the right-handed neutrino number density and integrated lepton
asymmetry, and show explicitly the impact of each assumption on these
quantities. For the first time, we investigate also the effects of scattering
of the right-handed neutrino with the top quark to leading order in the Yukawa
couplings by means of the full Boltzmann equations. We find that in our full
Boltzmann treatment the final lepton asymmetry can be suppressed by as much as
a factor of 1.5 in the weak wash-out regime (K<1), compared to the usual
integrated approach which assumes kinetic equilibrium and neglects quantum
statistics. This suppression is in contrast with the enhancement seen in some
previous studies that considered only decay and inverse decay of the
right-handed neutrino. However, this suppression quickly decreases as we
increase K. In the strong wash-out regime (K>1), the full Boltzmann treatment
and the integrated approach give nearly identical final lepton asymmetries
(within 10 % of each other at K>3). Finally, we show that the opposing effects
of quantum statistics on decays/inverse decays and the scattering processes
tend to reduce the net importance of scattering on leptogenesis in the full
treatment compared to the integrated approach.
| [
{
"created": "Wed, 1 Jul 2009 18:00:13 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Aug 2009 18:36:53 GMT",
"version": "v2"
}
] | 2009-09-28 | [
[
"Hahn-Woernle",
"F.",
""
],
[
"Plumacher",
"M.",
""
],
[
"Wong",
"Y. Y. Y.",
""
]
] | We study the evolution of a cosmological baryon asymmetry produced via leptogenesis by means of the full classical Boltzmann equations, without the assumption of kinetic equilibrium and including all quantum statistical factors. Beginning with the full mode equations we derive the usual equations of motion for the right-handed neutrino number density and integrated lepton asymmetry, and show explicitly the impact of each assumption on these quantities. For the first time, we investigate also the effects of scattering of the right-handed neutrino with the top quark to leading order in the Yukawa couplings by means of the full Boltzmann equations. We find that in our full Boltzmann treatment the final lepton asymmetry can be suppressed by as much as a factor of 1.5 in the weak wash-out regime (K<1), compared to the usual integrated approach which assumes kinetic equilibrium and neglects quantum statistics. This suppression is in contrast with the enhancement seen in some previous studies that considered only decay and inverse decay of the right-handed neutrino. However, this suppression quickly decreases as we increase K. In the strong wash-out regime (K>1), the full Boltzmann treatment and the integrated approach give nearly identical final lepton asymmetries (within 10 % of each other at K>3). Finally, we show that the opposing effects of quantum statistics on decays/inverse decays and the scattering processes tend to reduce the net importance of scattering on leptogenesis in the full treatment compared to the integrated approach. |
hep-ph/0511243 | Roberto Pittau | R. Pittau (U. of Torino), F. del Aguila (U. of Granada) and Ll.
Ametller (U. Politecnica de Catalunya) | QCD corrections to forward-backward charge asymmetries in l- l+ j
production at hadron colliders | 5 pages, 1 figure, talk presentad by R. Pittau at the International
Europhysics Conference on High Energy Physics, July 21st - 27th 2005, Lisbon,
Portugal | null | null | null | hep-ph | null | The large cross sections for gauge boson production at the Fermilab Tevatron
and the CERN Large Hadron Collider (LHC) might give a chance to determine the
electroweak parameters with high precision. We calculated two different
forward-backward charge asymmetries (A^CS_FB and A^j_FB) of lepton pairs in
events with a large transverse momentum jet p p (pbar) -> Z, gamma* + j -> e-
e+ j at next-to-leading order (NLO), O(alpha_s) corrections, making use of the
Monte Carlo programs MCFM and ALPGEN. These observables could provide a new
determination of the weak mixing angle sin^2 theta^lept_eff (M_Z^2) with a
statistical precision for each lepton flavour of 10^{-3} (7 x 10^{-3}) at LHC
(Tevatron). If b jets are identified, a new asymmetry with respect to the b
quark (A^b_FB) can also be measured with a statistical precision of 2 x 10^{-3}
(4 x 10^{-2}) at LHC (Tevatron). Finally, we comment on the dependence of our
results on various sources of uncertainties and compare, in the case of A^b_FB,
the exact result with an approximation that might be more suitable when
performing a realistic experimental analysis.
| [
{
"created": "Mon, 21 Nov 2005 16:56:22 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Pittau",
"R.",
"",
"U. of Torino"
],
[
"del Aguila",
"F.",
"",
"U. of Granada"
],
[
"Ametller",
"Ll.",
"",
"U. Politecnica de Catalunya"
]
] | The large cross sections for gauge boson production at the Fermilab Tevatron and the CERN Large Hadron Collider (LHC) might give a chance to determine the electroweak parameters with high precision. We calculated two different forward-backward charge asymmetries (A^CS_FB and A^j_FB) of lepton pairs in events with a large transverse momentum jet p p (pbar) -> Z, gamma* + j -> e- e+ j at next-to-leading order (NLO), O(alpha_s) corrections, making use of the Monte Carlo programs MCFM and ALPGEN. These observables could provide a new determination of the weak mixing angle sin^2 theta^lept_eff (M_Z^2) with a statistical precision for each lepton flavour of 10^{-3} (7 x 10^{-3}) at LHC (Tevatron). If b jets are identified, a new asymmetry with respect to the b quark (A^b_FB) can also be measured with a statistical precision of 2 x 10^{-3} (4 x 10^{-2}) at LHC (Tevatron). Finally, we comment on the dependence of our results on various sources of uncertainties and compare, in the case of A^b_FB, the exact result with an approximation that might be more suitable when performing a realistic experimental analysis. |
hep-ph/0611003 | Heather E. Logan | Heather E. Logan (Carleton U.) | QCD corrections to neutralino annihilation | 4 pages, to appear in Proceedings of SUSY06, the 14th International
Conference on Supersymmetry and the Unification of Fundamental Interactions,
UC Irvine, California, 12-17 June 2006 | AIPConf.Proc.903:571-574,2007 | 10.1063/1.2735249 | null | hep-ph | null | We report on two recent calculations of QCD corrections to neutralino
annihilation cross sections: (1) the next-to-leading order corrections to chi
chi -> g g, and (2) the contribution to the cross section for chi chi -> q qbar
g arising from interference between the tree-level and loop-induced processes.
| [
{
"created": "Wed, 1 Nov 2006 01:34:38 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Logan",
"Heather E.",
"",
"Carleton U."
]
] | We report on two recent calculations of QCD corrections to neutralino annihilation cross sections: (1) the next-to-leading order corrections to chi chi -> g g, and (2) the contribution to the cross section for chi chi -> q qbar g arising from interference between the tree-level and loop-induced processes. |
1208.1017 | Gaber Faisel Dr | Yan-Min Dai, Gaber Faisel, Dong-Won Jung, Otto C. W. Kong | Majorana versus Dirac mass from holomorphic supersymmetric
Nambu-Jona-Lasinio Model | 15 pages, 1 figure. Revised version matches the accepted one for
publication in Phy.Rev.D Journal | Phys. Rev. D 87 (2013) 085033 | 10.1103/PhysRevD.87.085033 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the theoretical features in relation to dynamical mass generation
and symmetry breaking for the recently proposed holomorphic supersymmetric
Nambu--Jona-Lasinio model. The basic model has two different chiral superfields
(multiplets) with a strongly coupled dimension five four-superfield
interaction. In addition to the possibility of generation of Dirac mass between
the pair established earlier, we show here the new option of generation of
Majorana masses for each chiral superfield. We also give a first look at what
condition may prefer Dirac over Majorana mass, illustrating that a split in the
soft supersymmetry breaking masses is crucial. In particular, in the limit
where one of the soft masses vanish, we show that generation of the Majorana
mass is no longer an option, while the Dirac mass generation survives well. The
latter is sensitive mostly to the average of the two soft masses. The result
has positive implication on the application of the model framework towards
dynamical electroweak symmetry breaking with Higgs superfields as composites.
| [
{
"created": "Sun, 5 Aug 2012 14:45:00 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Aug 2012 08:51:32 GMT",
"version": "v2"
},
{
"created": "Fri, 29 Mar 2013 10:30:09 GMT",
"version": "v3"
}
] | 2013-11-08 | [
[
"Dai",
"Yan-Min",
""
],
[
"Faisel",
"Gaber",
""
],
[
"Jung",
"Dong-Won",
""
],
[
"Kong",
"Otto C. W.",
""
]
] | We study the theoretical features in relation to dynamical mass generation and symmetry breaking for the recently proposed holomorphic supersymmetric Nambu--Jona-Lasinio model. The basic model has two different chiral superfields (multiplets) with a strongly coupled dimension five four-superfield interaction. In addition to the possibility of generation of Dirac mass between the pair established earlier, we show here the new option of generation of Majorana masses for each chiral superfield. We also give a first look at what condition may prefer Dirac over Majorana mass, illustrating that a split in the soft supersymmetry breaking masses is crucial. In particular, in the limit where one of the soft masses vanish, we show that generation of the Majorana mass is no longer an option, while the Dirac mass generation survives well. The latter is sensitive mostly to the average of the two soft masses. The result has positive implication on the application of the model framework towards dynamical electroweak symmetry breaking with Higgs superfields as composites. |
2112.11468 | Matheus Martines De Azevedo Da Silva | Oscar J.P. Eboli, M.C. Gonzalez-Garcia, and Matheus Martines | Electroweak HEFT after LHC run 2 | 19 pages, 7 figures | null | null | YITP-SB-2021-25 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the electroweak interactions in the framework of the Higgs
effective field theory using the available Higgs and electroweak diboson
production results from LHC run 2 as well as the electroweak precision data.
Assuming universality of the weak current, our study considers 25 possible
anomalous couplings. To unveil the nature of the Higgs boson, i.e. isosinglet
versus part of SU(2)L doublet, we explore the correlation effects between
observables that are predicted to exist in the linear realization of the
electroweak gauge symmetry but not in its non-linear counterpart. This improves
previous studies aimed at investigating the Higgs nature and the origin of the
electroweak symmetry breaking.
| [
{
"created": "Tue, 21 Dec 2021 19:00:01 GMT",
"version": "v1"
}
] | 2021-12-23 | [
[
"Eboli",
"Oscar J. P.",
""
],
[
"Gonzalez-Garcia",
"M. C.",
""
],
[
"Martines",
"Matheus",
""
]
] | We analyze the electroweak interactions in the framework of the Higgs effective field theory using the available Higgs and electroweak diboson production results from LHC run 2 as well as the electroweak precision data. Assuming universality of the weak current, our study considers 25 possible anomalous couplings. To unveil the nature of the Higgs boson, i.e. isosinglet versus part of SU(2)L doublet, we explore the correlation effects between observables that are predicted to exist in the linear realization of the electroweak gauge symmetry but not in its non-linear counterpart. This improves previous studies aimed at investigating the Higgs nature and the origin of the electroweak symmetry breaking. |
hep-ph/0204076 | D. Toublan | K. Splittorff, D. Toublan and J.J.M. Verbaarschot | Thermodynamics of chiral symmetry at low densities | 29 pages, Latex, typos corrected, 1 Ref added. Version to appear in
Nucl. Phys. B | Nucl.Phys. B639 (2002) 524-548 | 10.1016/S0550-3213(02)00440-6 | SUNY-NTG-02/15 | hep-ph cond-mat hep-lat hep-th | null | The phase diagram of two-color QCD as a function of temperature and baryon
chemical potential is considered. Using a low-energy chiral Lagrangian based on
the symmetries of the microscopic theory, we determine, at the one-loop level,
the temperature dependence of the critical chemical potential for diquark
condensation and the temperature dependence of the diquark condensate and
baryon density. The prediction for the temperature dependence of the critical
chemical potential is consistent with the one obtained for a dilute Bose gas.
The associated phase transition is shown to be of second order for low
temperatures and first order at higher temperatures. The tricritical point at
which the second order phase transition ends is determined. The results are
carried over to QCD with quarks in the adjoint representation and to ordinary
QCD at a non-zero chemical potential for isospin.
| [
{
"created": "Fri, 5 Apr 2002 21:23:43 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Jun 2002 08:26:45 GMT",
"version": "v2"
}
] | 2015-06-25 | [
[
"Splittorff",
"K.",
""
],
[
"Toublan",
"D.",
""
],
[
"Verbaarschot",
"J. J. M.",
""
]
] | The phase diagram of two-color QCD as a function of temperature and baryon chemical potential is considered. Using a low-energy chiral Lagrangian based on the symmetries of the microscopic theory, we determine, at the one-loop level, the temperature dependence of the critical chemical potential for diquark condensation and the temperature dependence of the diquark condensate and baryon density. The prediction for the temperature dependence of the critical chemical potential is consistent with the one obtained for a dilute Bose gas. The associated phase transition is shown to be of second order for low temperatures and first order at higher temperatures. The tricritical point at which the second order phase transition ends is determined. The results are carried over to QCD with quarks in the adjoint representation and to ordinary QCD at a non-zero chemical potential for isospin. |
2311.14306 | Hiroaki Kouno | Riki Oshima, Hiroaki Kouno, Kouji Kashiwa | Roberge-Weiss periodicity and singularity in hadron resonance gas model
with excluded volume effects | 11page, 17figures. (In the revised version, four references and some
sentences have been added. ) | null | null | null | hep-ph hep-lat nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Quantum chromodynamics (QCD) with pure imaginary baryon number chemical
potential mu =i theta T, where T is temperature and theta is a real number, has
the Roberge-Weiss periodicity. We study the theta-dependence of the baryon
number density and the pressure in the hadron resonance gas model with excluded
volume effects of baryons. It is shown that the baryon number density and the
pressure are smooth periodic functions of theta at low or high temperature.
However, they have singular behavior at theta =(2k+1)pi where k is an integer,
when T sim 211MeV. This temperature is consistent with the Roberge-Weiss
transition temperature TRW obtained by lattice QCD simulations. This
singularity can be explained by the dual excluded volume effects in which the
roles of point-like and non point-like particles are exchanged each other in
the ordinary excluded volume effects. It is also indicated that the excluded
volume effect is visible just below TRW and is directly detectable by the
lattice QCD simulation at finite theta. We compare the results with the one
obtained by the Polyakov-loop extended Nambu-Jona-Lasinio model.
| [
{
"created": "Fri, 24 Nov 2023 06:32:10 GMT",
"version": "v1"
},
{
"created": "Wed, 31 Jan 2024 03:52:09 GMT",
"version": "v2"
}
] | 2024-02-01 | [
[
"Oshima",
"Riki",
""
],
[
"Kouno",
"Hiroaki",
""
],
[
"Kashiwa",
"Kouji",
""
]
] | Quantum chromodynamics (QCD) with pure imaginary baryon number chemical potential mu =i theta T, where T is temperature and theta is a real number, has the Roberge-Weiss periodicity. We study the theta-dependence of the baryon number density and the pressure in the hadron resonance gas model with excluded volume effects of baryons. It is shown that the baryon number density and the pressure are smooth periodic functions of theta at low or high temperature. However, they have singular behavior at theta =(2k+1)pi where k is an integer, when T sim 211MeV. This temperature is consistent with the Roberge-Weiss transition temperature TRW obtained by lattice QCD simulations. This singularity can be explained by the dual excluded volume effects in which the roles of point-like and non point-like particles are exchanged each other in the ordinary excluded volume effects. It is also indicated that the excluded volume effect is visible just below TRW and is directly detectable by the lattice QCD simulation at finite theta. We compare the results with the one obtained by the Polyakov-loop extended Nambu-Jona-Lasinio model. |
hep-ph/9611246 | Gordon Ramsey | Gordon P. Ramsey (Loyola U Chicago and ANL) | Polarized Parton Distributions: Theory and Experiments | 15 pages, 3 figures, LaTeX. To appear in the proceedings of the
Circum-Pan-Pacific Workshop on High Energy Spin Physics 96, Kobe, Japan, 2-4
October, 1996 | null | null | null | hep-ph | null | I review the constituent contributions to the spin of the proton extracted
from recent data at CERN, SLAC and DESY. The valence, sea quark and antiquark
spin-weighted distributions are determined separately. The data appear to imply
a small to moderate polarized gluon distribution, so that the anomaly term is
not significant in determining these contributions. We have analyzed the
consistency of the results obtained from various sets of data and the Bjorken
Sum Rule. All data are consistent with the sum rule, but they differ in the
contribution of the strange sea to proton spin. This and the remaining
uncertainty in the polarized gluon distribution pose unanswered questions about
hadronic spin. Further experiments are suggested which can extract information
about the polarized gluon and sea to address these questions.
| [
{
"created": "Tue, 5 Nov 1996 22:36:46 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Ramsey",
"Gordon P.",
"",
"Loyola U Chicago and ANL"
]
] | I review the constituent contributions to the spin of the proton extracted from recent data at CERN, SLAC and DESY. The valence, sea quark and antiquark spin-weighted distributions are determined separately. The data appear to imply a small to moderate polarized gluon distribution, so that the anomaly term is not significant in determining these contributions. We have analyzed the consistency of the results obtained from various sets of data and the Bjorken Sum Rule. All data are consistent with the sum rule, but they differ in the contribution of the strange sea to proton spin. This and the remaining uncertainty in the polarized gluon distribution pose unanswered questions about hadronic spin. Further experiments are suggested which can extract information about the polarized gluon and sea to address these questions. |
hep-ph/0406030 | Roberto Casalbuoni | R. Casalbuoni and G. Nardulli | Skyrmions and pentaquarks in the quark-hadron continuity perspective | 12 pages, LaTex. 2 figures. Final version for Physics Letters B | Phys.Lett. B602 (2004) 205-211 | 10.1016/j.physletb.2004.10.010 | BARI-TH 490/04, DFF-418/06/04 | hep-ph | null | We argue that in the color-flavor-locking (CFL) superconducting phase
classical soliton solutions can exist, whose excitations should be interpreted
as states formed by a quark (or an antiquark) and condensed diquarks. This
finding extends the picture of quark-hadron-continuity showing the existence of
a region, intermediate between the CFL and the hypernuclear phase, where chiral
solitons and Nambu Goldstone bosons can exist. We derive an expression of the
soliton mass in terms of the QCD coupling, $g_s$, and the Nambu Goldstone boson
parameters. From the quark-hadron continuity we can draw an argument in favor
of the interpretation of the $\Theta^+(1540)$ particle in terms of a strange
antiquark and two highly correlated $ud$ pairs (diquarks).
| [
{
"created": "Wed, 2 Jun 2004 18:04:13 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Oct 2004 09:38:28 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Casalbuoni",
"R.",
""
],
[
"Nardulli",
"G.",
""
]
] | We argue that in the color-flavor-locking (CFL) superconducting phase classical soliton solutions can exist, whose excitations should be interpreted as states formed by a quark (or an antiquark) and condensed diquarks. This finding extends the picture of quark-hadron-continuity showing the existence of a region, intermediate between the CFL and the hypernuclear phase, where chiral solitons and Nambu Goldstone bosons can exist. We derive an expression of the soliton mass in terms of the QCD coupling, $g_s$, and the Nambu Goldstone boson parameters. From the quark-hadron continuity we can draw an argument in favor of the interpretation of the $\Theta^+(1540)$ particle in terms of a strange antiquark and two highly correlated $ud$ pairs (diquarks). |
1707.05644 | Konstantinos Dimopoulos | Konstantinos Dimopoulos | Ultra slow-roll inflation demystified | 10 pages, published version | null | 10.1016/j.physletb.2017.10.066 | null | hep-ph astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Ultra-slow-roll (USR) inflation is a new mode of inflation which corresponds
to the occasions when the inflaton field must traverse an extremely flat part
of the scalar potential, when the usual slow-roll (SR) fails. We investigate
USR and obtain an estimate for how long it lasts, given the initial kinetic
density of the inflaton. We also find that, if the initial kinetic density is
small enough, USR can be avoided and the usual SR treatment is valid. This has
important implications for inflection-point inflation.
| [
{
"created": "Tue, 18 Jul 2017 14:33:18 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Sep 2017 10:47:46 GMT",
"version": "v2"
},
{
"created": "Wed, 15 Nov 2017 15:54:02 GMT",
"version": "v3"
}
] | 2017-12-06 | [
[
"Dimopoulos",
"Konstantinos",
""
]
] | Ultra-slow-roll (USR) inflation is a new mode of inflation which corresponds to the occasions when the inflaton field must traverse an extremely flat part of the scalar potential, when the usual slow-roll (SR) fails. We investigate USR and obtain an estimate for how long it lasts, given the initial kinetic density of the inflaton. We also find that, if the initial kinetic density is small enough, USR can be avoided and the usual SR treatment is valid. This has important implications for inflection-point inflation. |
hep-ph/9904382 | Marek Jezabek | M. Jezabek and Y. Sumino | Neutrino Masses and Bimaximal Mixing | Latex, 13 p., no figures | Phys.Lett. B457 (1999) 139-146 | 10.1016/S0370-2693(99)00517-1 | TP-USl/99/03 and TU-563 | hep-ph | null | Solar and atmospheric neutrino anomalies are described by bimaximal mixing of
three neutrinos. Neutrino oscillations in appearance nu_e <--> nu_mu,nu_tau and
in disappearance nu_e long baseline and atmospheric experiments are sensitive
to deviations from the ideal bimaximal mixing. It is suggested that these
deviations may be dominated by a rotation in the electron--muon plane of the
generation space. Simple seesaw models are described supporting this idea. The
rotation angle is estimated from Fritzsch's relation. Predictions are presented
for oscillations in long baseline experiments, for solar neutrinos, and for the
rates of neutrinoless double beta decays.
| [
{
"created": "Mon, 19 Apr 1999 15:53:29 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Jezabek",
"M.",
""
],
[
"Sumino",
"Y.",
""
]
] | Solar and atmospheric neutrino anomalies are described by bimaximal mixing of three neutrinos. Neutrino oscillations in appearance nu_e <--> nu_mu,nu_tau and in disappearance nu_e long baseline and atmospheric experiments are sensitive to deviations from the ideal bimaximal mixing. It is suggested that these deviations may be dominated by a rotation in the electron--muon plane of the generation space. Simple seesaw models are described supporting this idea. The rotation angle is estimated from Fritzsch's relation. Predictions are presented for oscillations in long baseline experiments, for solar neutrinos, and for the rates of neutrinoless double beta decays. |
0804.3008 | Roman Nikolaevich Lee | R.N. Lee | Group structure of the integration-by-part identities and its
application to the reduction of multiloop integrals | 6 pages, RevTeX. Version, published in JHEP, references corrected | JHEP0807:031,2008 | 10.1088/1126-6708/2008/07/031 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The excessiveness of integration-by-part (IBP) identities is discussed. The
Lie-algebraic structure of the IBP identities is used to reduce the number of
the IBP equations to be considered. It is shown that Lorentz-invariance (LI)
identities do not bring any information additional to that contained in the IBP
identities, and therefore, can be discarded.
| [
{
"created": "Fri, 18 Apr 2008 12:54:19 GMT",
"version": "v1"
},
{
"created": "Fri, 8 Aug 2008 13:14:41 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Lee",
"R. N.",
""
]
] | The excessiveness of integration-by-part (IBP) identities is discussed. The Lie-algebraic structure of the IBP identities is used to reduce the number of the IBP equations to be considered. It is shown that Lorentz-invariance (LI) identities do not bring any information additional to that contained in the IBP identities, and therefore, can be discarded. |
1105.0756 | Bingfang Yang | Bingfang Yang, Jinzhong Han, Lin Wang and Xuelei Wang | Top quark pair production via $e^{+}e^{-}$ collision in the littlest
Higgs model with T-parity at the ILC | null | Phys.Rev.D83:094020,2011 | 10.1103/PhysRevD.83.094020 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the littlest Higgs model with T-parity, we studied the contributions of
the new particles to the top-quark pair production via $e^{+}e^{-}$ collision
at the International Linear Collider. We calculated the top-quark pair
production cross section and found this process can generate significantly
relative correction. The result may be a sensitive probe of the littlest Higgs
model with T-parity.
| [
{
"created": "Wed, 4 May 2011 08:25:28 GMT",
"version": "v1"
},
{
"created": "Sun, 11 Sep 2011 08:09:41 GMT",
"version": "v2"
},
{
"created": "Sat, 26 May 2012 09:37:35 GMT",
"version": "v3"
},
{
"created": "Tue, 29 May 2012 02:44:18 GMT",
"version": "v4"
}
] | 2012-05-30 | [
[
"Yang",
"Bingfang",
""
],
[
"Han",
"Jinzhong",
""
],
[
"Wang",
"Lin",
""
],
[
"Wang",
"Xuelei",
""
]
] | In the littlest Higgs model with T-parity, we studied the contributions of the new particles to the top-quark pair production via $e^{+}e^{-}$ collision at the International Linear Collider. We calculated the top-quark pair production cross section and found this process can generate significantly relative correction. The result may be a sensitive probe of the littlest Higgs model with T-parity. |
hep-ph/0406266 | Pavlos Pasipoularides | K. Farakos and P. Pasipoularides | Effective potential analysis for 5D SU(2) gauge theories at finite
temperature and radius | 18 pages, 7 figures ; typos corrected | Nucl.Phys. B705 (2005) 92-110 | 10.1016/j.nuclphysb.2004.11.044 | null | hep-ph hep-lat hep-th | null | We calculate the one loop effective potential for a 5D SU(2) gauge field
theory at finite temperature $T=1/\beta$ and radius R=1/M. This calculation is
performed, for the first time, in the case of background fields with two
constant components $A^{3}_{y}$ (directed towards the compact extra dimension
with radius R) and $A^{3}_{\tau}$ (directed towards the compact Euclidean time
with radius $\beta$). This model possesses two discrete symmetries known as
Z_{M}(2) and Z_{T}(2). The corresponding phase diagram is presented in Ref. 4.
However the arguments which lead to this diagram are mainly qualitative. We
present a detailed analysis, from our point of view, for this phase diagram,
and we support our arguments performing lattice simulations for a simple
phenomenological model with two scalar fields interacting through the
previously calculated potential.
| [
{
"created": "Thu, 24 Jun 2004 00:24:50 GMT",
"version": "v1"
},
{
"created": "Sat, 3 Jul 2004 06:31:16 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Farakos",
"K.",
""
],
[
"Pasipoularides",
"P.",
""
]
] | We calculate the one loop effective potential for a 5D SU(2) gauge field theory at finite temperature $T=1/\beta$ and radius R=1/M. This calculation is performed, for the first time, in the case of background fields with two constant components $A^{3}_{y}$ (directed towards the compact extra dimension with radius R) and $A^{3}_{\tau}$ (directed towards the compact Euclidean time with radius $\beta$). This model possesses two discrete symmetries known as Z_{M}(2) and Z_{T}(2). The corresponding phase diagram is presented in Ref. 4. However the arguments which lead to this diagram are mainly qualitative. We present a detailed analysis, from our point of view, for this phase diagram, and we support our arguments performing lattice simulations for a simple phenomenological model with two scalar fields interacting through the previously calculated potential. |
2107.08206 | Guoxing Wang | Guoxing Wang, Xiaofeng Xu, Yongqi Xu, Li Lin Yang | Next-to-leading order corrections for $gg \to ZH$ with top quark mass
dependence | null | null | 10.1016/j.physletb.2022.137087 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this Letter, we present for the first time a calculation of the complete
next-to-leading order corrections to the $gg \to ZH$ process. We use the method
of small mass expansion to tackle the most challenging two-loop virtual
amplitude, in which the top quark mass dependence is retained throughout the
calculations. We show that our method provides reliable numeric results in all
kinematic regions, and present phenomenological predictions for the total and
differential cross sections at the Large Hadron Collider and its future
upgrades. Our results are necessary ingredients towards reducing the
theoretical uncertainties of the $pp \to ZH$ cross sections down to the
percent-level, and provide important theoretical inputs for future precision
experimental collider programs.
| [
{
"created": "Sat, 17 Jul 2021 08:52:59 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Sep 2022 06:23:09 GMT",
"version": "v2"
}
] | 2022-09-20 | [
[
"Wang",
"Guoxing",
""
],
[
"Xu",
"Xiaofeng",
""
],
[
"Xu",
"Yongqi",
""
],
[
"Yang",
"Li Lin",
""
]
] | In this Letter, we present for the first time a calculation of the complete next-to-leading order corrections to the $gg \to ZH$ process. We use the method of small mass expansion to tackle the most challenging two-loop virtual amplitude, in which the top quark mass dependence is retained throughout the calculations. We show that our method provides reliable numeric results in all kinematic regions, and present phenomenological predictions for the total and differential cross sections at the Large Hadron Collider and its future upgrades. Our results are necessary ingredients towards reducing the theoretical uncertainties of the $pp \to ZH$ cross sections down to the percent-level, and provide important theoretical inputs for future precision experimental collider programs. |
0705.3082 | Xiang Liu | Bo Zhang, Xiang Liu and Shi-Lin Zhu | The dispersive contribution of $\rho(1450,1700)$ decays and X(1576) | 4 pages, 4 figures | Chin.Phys.Lett.24:2537-2539,2007 | 10.1088/0256-307X/24/9/020 | null | hep-ph | null | We study whether the broad enhancement X(1576) arises from the final state
interaction (FSI) of $\rho(1450,1700)\to \rho^+\rho^-\to K^{+}K^{-}$ decays. We
consider both the absorptive and dispersive contribution of the above
amplitudes since the intermediate states are very close to $\rho(1450,1700)$.
The same mechanism leads to a similar enhancement around 1580 MeV in the
$\pi^{+}\pi^-$ spectrum in the $J/\psi\to \pi^{0}\pi^{+}\pi^{-}$ channel, which
can be used to test whether X(1576) can be ascribed to the FSI effect of
$\rho(1450,1700)\to \rho^+\rho^-$.
| [
{
"created": "Tue, 22 May 2007 05:41:28 GMT",
"version": "v1"
},
{
"created": "Sun, 24 Jun 2007 01:48:12 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Zhang",
"Bo",
""
],
[
"Liu",
"Xiang",
""
],
[
"Zhu",
"Shi-Lin",
""
]
] | We study whether the broad enhancement X(1576) arises from the final state interaction (FSI) of $\rho(1450,1700)\to \rho^+\rho^-\to K^{+}K^{-}$ decays. We consider both the absorptive and dispersive contribution of the above amplitudes since the intermediate states are very close to $\rho(1450,1700)$. The same mechanism leads to a similar enhancement around 1580 MeV in the $\pi^{+}\pi^-$ spectrum in the $J/\psi\to \pi^{0}\pi^{+}\pi^{-}$ channel, which can be used to test whether X(1576) can be ascribed to the FSI effect of $\rho(1450,1700)\to \rho^+\rho^-$. |
1510.04694 | Volodymyr Takhistov | Mu-Chun Chen, Jinrui Huang and Volodymyr Takhistov | Beyond Minimal Lepton Flavored Dark Matter | 30 pages, 12 figures; minor corrections, added references and
discussion on decaying dark matter, matches published version | JHEP 1602 (2016) 60 | 10.1007/JHEP02(2016)060 | UCI-TR-2015-17, LA-UR-15-27938 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a class of flavored dark matter (DM) theories where dark matter
interacts with the Standard Model lepton fields at the renormalizable level. We
allow for a general coupling matrix between the dark matter and leptons whose
structure is beyond the one permitted by the minimal flavor violation (MFV)
assumption. It is assumed that this is the only new source of flavor violation
in addition to the Standard Model (SM) Yukawa interactions. The setup can be
described by augmenting the SM flavor symmetry by an additional
$\mathrm{SU}(3)_{\chi}$, under which the dark matter $\chi$ transforms. This
framework is especially phenomenologically rich, due to possible novel
flavor-changing interactions which are not present within the more restrictive
MFV framework. As a representative case study of this setting, which we call
"beyond MFV" (BMFV), we consider Dirac fermion dark matter which transforms as
a singlet under the SM gauge group and a triplet under $\mathrm{SU}(3)_{\chi}$.
The DM fermion couples to the SM lepton sector through a scalar mediator
$\phi$. Unlike the case of quark-flavored DM, we show that there is no
$\mathbb{Z}_3$ symmetry within either the MFV or BMFV settings which
automatically stabilizes the lepton-flavored DM. We discuss constraints on this
setup from flavor-changing processes, DM relic abundance as well as direct and
indirect detections. We find that relatively large flavor-changing couplings
are possible, while the dark matter mass is still within the phenomenologically
interesting region below the TeV scale. Collider signatures which can be
potentially searched for at the lepton and hadron colliders are discussed.
Finally, we discuss the implications for decaying dark matter, which can appear
if an additional stabilizing symmetry is not imposed.
| [
{
"created": "Thu, 15 Oct 2015 20:03:19 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Feb 2016 09:42:29 GMT",
"version": "v2"
}
] | 2016-02-17 | [
[
"Chen",
"Mu-Chun",
""
],
[
"Huang",
"Jinrui",
""
],
[
"Takhistov",
"Volodymyr",
""
]
] | We consider a class of flavored dark matter (DM) theories where dark matter interacts with the Standard Model lepton fields at the renormalizable level. We allow for a general coupling matrix between the dark matter and leptons whose structure is beyond the one permitted by the minimal flavor violation (MFV) assumption. It is assumed that this is the only new source of flavor violation in addition to the Standard Model (SM) Yukawa interactions. The setup can be described by augmenting the SM flavor symmetry by an additional $\mathrm{SU}(3)_{\chi}$, under which the dark matter $\chi$ transforms. This framework is especially phenomenologically rich, due to possible novel flavor-changing interactions which are not present within the more restrictive MFV framework. As a representative case study of this setting, which we call "beyond MFV" (BMFV), we consider Dirac fermion dark matter which transforms as a singlet under the SM gauge group and a triplet under $\mathrm{SU}(3)_{\chi}$. The DM fermion couples to the SM lepton sector through a scalar mediator $\phi$. Unlike the case of quark-flavored DM, we show that there is no $\mathbb{Z}_3$ symmetry within either the MFV or BMFV settings which automatically stabilizes the lepton-flavored DM. We discuss constraints on this setup from flavor-changing processes, DM relic abundance as well as direct and indirect detections. We find that relatively large flavor-changing couplings are possible, while the dark matter mass is still within the phenomenologically interesting region below the TeV scale. Collider signatures which can be potentially searched for at the lepton and hadron colliders are discussed. Finally, we discuss the implications for decaying dark matter, which can appear if an additional stabilizing symmetry is not imposed. |
2105.00915 | Ziyue Wang | Ziyue Wang and Pengfei Zhuang | Damping and polarization rates in near equilibrium state | 14 pages, 1 figure | null | null | null | hep-ph | http://creativecommons.org/publicdomain/zero/1.0/ | The collision terms in spin transport theory are analyzed in Kadanoff-Baym
formalism for systems close to equilibrium. The non-equilibrium fluctuations in
spin distribution include both damping and polarization, with the latter
arising from the exchange between orbital and spin angular momenta. The damping
and polarization rates or the relaxation times are expressed in terms of
various Dirac components of the self-energy. Unlike the usually used
Anderson-Witting relaxation time approximation assuming a single time scale for
different degrees of freedom, the polarization effect is induced by the thermal
vorticity and its time scale of thermalization is different from the damping.
The numerical calculation in the Nambu--Jona-Lasinio model shows that, charge
is thermalized earlier and spin is thermalized later.
| [
{
"created": "Mon, 3 May 2021 14:50:26 GMT",
"version": "v1"
}
] | 2021-05-04 | [
[
"Wang",
"Ziyue",
""
],
[
"Zhuang",
"Pengfei",
""
]
] | The collision terms in spin transport theory are analyzed in Kadanoff-Baym formalism for systems close to equilibrium. The non-equilibrium fluctuations in spin distribution include both damping and polarization, with the latter arising from the exchange between orbital and spin angular momenta. The damping and polarization rates or the relaxation times are expressed in terms of various Dirac components of the self-energy. Unlike the usually used Anderson-Witting relaxation time approximation assuming a single time scale for different degrees of freedom, the polarization effect is induced by the thermal vorticity and its time scale of thermalization is different from the damping. The numerical calculation in the Nambu--Jona-Lasinio model shows that, charge is thermalized earlier and spin is thermalized later. |
hep-ph/9711366 | Erwin Mirkes | E. Mirkes, S. Willfahrt and D. Zeppenfeld | Jet Production in DIS at NLO Including Z and W Exchange | Talk given by E. Mirkes at the International Europhysics Conference
on High-Energy Physics (HEP 97), Jerusalem, Israel, 19-26 Aug 1997. Latex, 2
pages, 1 figure. The complete paper, including figures, is also available via
anonymous ftp at ftp://ttpux2.physik.uni-karlsruhe.de/ , or via www at
http://www-ttp.physik.uni-karlsruhe.de/cgi-bin/preprints/ | null | null | TTP97-47 | hep-ph | null | Next-to-leading order QCD predictions for 1-jet and 2-jet cross sections in
deep inelastic scattering with complete neutral current ($\gamma^*$ and $Z$)
and charged current ($W^\pm$) exchange are presented.
| [
{
"created": "Tue, 18 Nov 1997 10:22:33 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Mirkes",
"E.",
""
],
[
"Willfahrt",
"S.",
""
],
[
"Zeppenfeld",
"D.",
""
]
] | Next-to-leading order QCD predictions for 1-jet and 2-jet cross sections in deep inelastic scattering with complete neutral current ($\gamma^*$ and $Z$) and charged current ($W^\pm$) exchange are presented. |
1902.03602 | Vadim Egorov | Vadim O. Egorov, Igor P. Volobuev | Coherence length of neutrino oscillations in quantum field-theoretical
approach | LaTex, 18 pages, 15 figures. Multiple adjustments | Phys. Rev. D 100, 033004 (2019) | 10.1103/PhysRevD.100.033004 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a novel quantum field-theoretical approach to the description of
processes passing at finite space-time intervals based on the Feynman diagram
technique in the coordinate representation. The most known processes of this
type are neutrino and neutral kaon oscillations. The experimental setting of
these processes requires one to adjust the rules of passing to the momentum
representation in the Feynman diagram technique in accordance with it, which
leads to a modification of the Feynman propagator in the momentum
representation. The approach does not make use of wave packets, both initial
and final particle states are described by plane waves, which simplifies the
calculations considerably. We consider neutrino oscillation processes, where
the neutrinos are produced in three-particle weak decays of nuclei and detected
in the charged-current interaction with nuclei or in the charged- and
neutral-current interactions with electrons. Particular examples are considered
and it is shown that the momentum spread of the produced neutrinos and the
energy dependence of the differential cross section of the detection process
result in the suppression of neutrino oscillation, which is characterized by a
coherence length specific for a pair of production and detection processes.
This coherence length turns out to be much less than the coherence length in
the standard quantum-mechanical approach defined by the quantum uncertainty of
neutrino momentum.
| [
{
"created": "Sun, 10 Feb 2019 13:56:06 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Feb 2019 13:44:57 GMT",
"version": "v2"
},
{
"created": "Sun, 24 Mar 2019 18:22:02 GMT",
"version": "v3"
}
] | 2019-08-28 | [
[
"Egorov",
"Vadim O.",
""
],
[
"Volobuev",
"Igor P.",
""
]
] | We consider a novel quantum field-theoretical approach to the description of processes passing at finite space-time intervals based on the Feynman diagram technique in the coordinate representation. The most known processes of this type are neutrino and neutral kaon oscillations. The experimental setting of these processes requires one to adjust the rules of passing to the momentum representation in the Feynman diagram technique in accordance with it, which leads to a modification of the Feynman propagator in the momentum representation. The approach does not make use of wave packets, both initial and final particle states are described by plane waves, which simplifies the calculations considerably. We consider neutrino oscillation processes, where the neutrinos are produced in three-particle weak decays of nuclei and detected in the charged-current interaction with nuclei or in the charged- and neutral-current interactions with electrons. Particular examples are considered and it is shown that the momentum spread of the produced neutrinos and the energy dependence of the differential cross section of the detection process result in the suppression of neutrino oscillation, which is characterized by a coherence length specific for a pair of production and detection processes. This coherence length turns out to be much less than the coherence length in the standard quantum-mechanical approach defined by the quantum uncertainty of neutrino momentum. |
hep-ph/9505357 | Michael Goodband | M.Goodband and M.Hindmarsh | Instabilities of Electroweak Strings | Latex, 11 pages, 1 uuencoded figure | Phys.Lett. B363 (1995) 58-64 | 10.1016/0370-2693(95)01198-Y | SUSX-TH-95/72 | hep-ph hep-th | null | We investigate the instabilities of low winding number electroweak strings
using standard numerical techniques of linear algebra. For strings of unit
winding we are able to confirm and extend existing calculations of the unstable
region in the ($m_H/m_W,\sin^2\theta_W$) plane. For strings of higher winding
number we map the unstable regions for the various decay modes.
| [
{
"created": "Mon, 22 May 1995 16:49:35 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Goodband",
"M.",
""
],
[
"Hindmarsh",
"M.",
""
]
] | We investigate the instabilities of low winding number electroweak strings using standard numerical techniques of linear algebra. For strings of unit winding we are able to confirm and extend existing calculations of the unstable region in the ($m_H/m_W,\sin^2\theta_W$) plane. For strings of higher winding number we map the unstable regions for the various decay modes. |
1109.1565 | Abhishek Kumar | Abhishek Kumar, David E. Morrissey, and Andrew Spray | Kinetically-Enhanced Anomaly Mediation | 29 pages, 10 figures; Added references, corrected ctau plot in Fig.
4, same general conclusions | null | 10.1007/JHEP12(2011)013 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate a modification of anomaly-mediated supersymmetry breaking
(AMSB) with an exotic U(1)_x gauge sector that can solve the tachyonic slepton
problem of minimal AMSB scenarios. The new U(1)_x multiplet is assumed to
couple directly to the source of supersymmetry breaking, but only indirectly to
the minimal supersymmetric Standard Model (MSSM) through kinetic mixing with
hypercharge. If the MSSM sector is also sequestered from the source of
supersymmetry breaking, the contributions to the MSSM soft terms come from both
AMSB and the U(1)_x kinetic coupling. We find that this arrangement can give
rise to a flavour-universal, phenomenologically viable, and distinctive
spectrum of MSSM superpartners. We also investigate the prospects for discovery
and the most likely signatures of this scenario at the Large Hadron Collider
(LHC).
| [
{
"created": "Wed, 7 Sep 2011 20:03:43 GMT",
"version": "v1"
},
{
"created": "Sat, 24 Sep 2011 03:39:08 GMT",
"version": "v2"
}
] | 2015-05-30 | [
[
"Kumar",
"Abhishek",
""
],
[
"Morrissey",
"David E.",
""
],
[
"Spray",
"Andrew",
""
]
] | We investigate a modification of anomaly-mediated supersymmetry breaking (AMSB) with an exotic U(1)_x gauge sector that can solve the tachyonic slepton problem of minimal AMSB scenarios. The new U(1)_x multiplet is assumed to couple directly to the source of supersymmetry breaking, but only indirectly to the minimal supersymmetric Standard Model (MSSM) through kinetic mixing with hypercharge. If the MSSM sector is also sequestered from the source of supersymmetry breaking, the contributions to the MSSM soft terms come from both AMSB and the U(1)_x kinetic coupling. We find that this arrangement can give rise to a flavour-universal, phenomenologically viable, and distinctive spectrum of MSSM superpartners. We also investigate the prospects for discovery and the most likely signatures of this scenario at the Large Hadron Collider (LHC). |
2303.01530 | Xiaohui Liu | Haotian Cao, Xiaohui Liu, Hua Xing Zhu | Towards the Precision Nucleon Energy-Energy Correlator in Lepton-Ion
Collisions | 17 pages, 3 figures | null | null | null | hep-ph hep-ex nucl-ex | http://creativecommons.org/licenses/by/4.0/ | The nucleon energy-energy correlator (NEEC) was proposed in 2209.02080 as a
new way of studying nucleon intrinsic dynamics. In this work, we present a
detailed derivation of the factorization theorem that enables the measurement
of the unpolarized NEEC in lepton-ion collisions. As a first step towards a
precise measurement of this quantity, we obtained the
next-to-leading-logarithmic (NLL, $\sim{\cal O}(\alpha_s^n L^{n-1})$)
resummation in a concise analytic form, and predicted the analytic
$\theta$-angle distribution at ${\cal O}(\alpha^2_s)$. Extending our analytic
resummation formula to higher logarithmic accuracy and the factorization
theorem to hadron-hadron collisions is straightforward.
| [
{
"created": "Thu, 2 Mar 2023 19:00:15 GMT",
"version": "v1"
}
] | 2023-03-06 | [
[
"Cao",
"Haotian",
""
],
[
"Liu",
"Xiaohui",
""
],
[
"Zhu",
"Hua Xing",
""
]
] | The nucleon energy-energy correlator (NEEC) was proposed in 2209.02080 as a new way of studying nucleon intrinsic dynamics. In this work, we present a detailed derivation of the factorization theorem that enables the measurement of the unpolarized NEEC in lepton-ion collisions. As a first step towards a precise measurement of this quantity, we obtained the next-to-leading-logarithmic (NLL, $\sim{\cal O}(\alpha_s^n L^{n-1})$) resummation in a concise analytic form, and predicted the analytic $\theta$-angle distribution at ${\cal O}(\alpha^2_s)$. Extending our analytic resummation formula to higher logarithmic accuracy and the factorization theorem to hadron-hadron collisions is straightforward. |
hep-ph/0110227 | Ben Allanach | B.C. Allanach | Theoretical Uncertainties in Sparticle Mass Predictions | revTex4 style. Softsusy homepage is at
http://allanach.home.cern.ch/allanach/softsusy.html Written for Snowmass
2001. Replaced version has updated reference. 3 pages, 3 figures | eConf C010630 (2001) P319 | null | CERN-TH/2001-255 | hep-ph | null | We contrast the sparticle spectra obtained from three modern publicly
available codes along model lines in minimal supersymmetric standard model
(MSSM) parameter space. From this we gain an idea of the uncertainties involved
with sparticle spectra calculations. The differences in predicted sparticle
masses are typically at the several percent-level. In the focus-point scenario,
there are differences of 30% in the weak gaugino masses. These uncertainties
need to be reduced in order to obtain accurate information about fundamental
models of supersymmetry breaking.
| [
{
"created": "Wed, 17 Oct 2001 09:58:47 GMT",
"version": "v1"
},
{
"created": "Sun, 11 Nov 2001 12:38:46 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Allanach",
"B. C.",
""
]
] | We contrast the sparticle spectra obtained from three modern publicly available codes along model lines in minimal supersymmetric standard model (MSSM) parameter space. From this we gain an idea of the uncertainties involved with sparticle spectra calculations. The differences in predicted sparticle masses are typically at the several percent-level. In the focus-point scenario, there are differences of 30% in the weak gaugino masses. These uncertainties need to be reduced in order to obtain accurate information about fundamental models of supersymmetry breaking. |
1205.2943 | Xianhui Zhong | Lei-Hua Liu, Li-Ye Xiao and Xian-Hui Zhong | Charm-strange baryon strong decays in a chiral quark model | 15 pages, 9 figures | null | 10.1103/PhysRevD.86.034024 | null | hep-ph hep-ex nucl-th | http://creativecommons.org/licenses/by/3.0/ | The strong decays of charm-strange baryons up to N=2 shell are studied in a
chiral quark model. The theoretical predictions for the well determined
charm-strange baryons, $\Xi_c^*(2645)$, $\Xi_c(2790)$ and $\Xi_c(2815)$, are in
good agreement with the experimental data. This model is also extended to
analyze the strong decays of the other newly observed charm-strange baryons
$\Xi_c(2930)$, $\Xi_c(2980)$, $\Xi_c(3055)$, $\Xi_c(3080)$ and $\Xi_c(3123)$.
Our predictions are given as follows. (i) $\Xi_c(2930)$ might be the first
$P$-wave excitation of $\Xi_c'$ with $J^P=1/2^-$, favors the $|\Xi_c'\
^2P_\lambda 1/2^->$ or $|\Xi_c'\ ^4P_\lambda 1/2^->$ state. (ii) $\Xi_c(2980)$
might correspond to two overlapping $P$-wave states $|\Xi_c'\ ^2P_\rho 1/2^->$
and $|\Xi_c'\ ^2P_\rho 3/2^->$, respectively. The $\Xi_c(2980)$ observed in the
$\Lambda_c^+\bar{K}\pi$ final state is most likely to be the $|\Xi_c'\ ^2P_\rho
1/2^->$ state, while the narrower resonance with a mass $m\simeq 2.97$ GeV
observed in the $\Xi_c^*(2645)\pi$ channel favors to be assigned to the
$|\Xi_c'\ ^2P_\rho 3/2^->$ state. (iii) $\Xi_c(3080)$ favors to be classified
as the $|\Xi_c\ S_{\rho\rho} 1/2^+>$ state, i.e., the first radial excitation
(2S) of $\Xi_c$. (iv) $\Xi_c(3055)$ is most likely to be the first $D$-wave
excitation of $\Xi_c$ with $J^P=3/2^+$, favors the $|\Xi_c\
^2D_{\lambda\lambda} 3/2^+>$ state. (v) $\Xi_c(3123)$ might be assigned to the
$|\Xi_c'\ ^4D_{\lambda\lambda} 3/2^+>$, $|\Xi_c'\ ^4D_{\lambda\lambda} 5/2^+>$,
or $|\Xi_c\ ^2D_{\rho\rho} 5/2^+>$ state. As a by-product, we calculate the
strong decays of the bottom baryons $\Sigma_b^{\pm}$, $\Sigma_b^{*\pm}$ and
$\Xi_b^*$, which are in good agreement with the recent observations as well.
| [
{
"created": "Mon, 14 May 2012 06:01:17 GMT",
"version": "v1"
}
] | 2013-05-30 | [
[
"Liu",
"Lei-Hua",
""
],
[
"Xiao",
"Li-Ye",
""
],
[
"Zhong",
"Xian-Hui",
""
]
] | The strong decays of charm-strange baryons up to N=2 shell are studied in a chiral quark model. The theoretical predictions for the well determined charm-strange baryons, $\Xi_c^*(2645)$, $\Xi_c(2790)$ and $\Xi_c(2815)$, are in good agreement with the experimental data. This model is also extended to analyze the strong decays of the other newly observed charm-strange baryons $\Xi_c(2930)$, $\Xi_c(2980)$, $\Xi_c(3055)$, $\Xi_c(3080)$ and $\Xi_c(3123)$. Our predictions are given as follows. (i) $\Xi_c(2930)$ might be the first $P$-wave excitation of $\Xi_c'$ with $J^P=1/2^-$, favors the $|\Xi_c'\ ^2P_\lambda 1/2^->$ or $|\Xi_c'\ ^4P_\lambda 1/2^->$ state. (ii) $\Xi_c(2980)$ might correspond to two overlapping $P$-wave states $|\Xi_c'\ ^2P_\rho 1/2^->$ and $|\Xi_c'\ ^2P_\rho 3/2^->$, respectively. The $\Xi_c(2980)$ observed in the $\Lambda_c^+\bar{K}\pi$ final state is most likely to be the $|\Xi_c'\ ^2P_\rho 1/2^->$ state, while the narrower resonance with a mass $m\simeq 2.97$ GeV observed in the $\Xi_c^*(2645)\pi$ channel favors to be assigned to the $|\Xi_c'\ ^2P_\rho 3/2^->$ state. (iii) $\Xi_c(3080)$ favors to be classified as the $|\Xi_c\ S_{\rho\rho} 1/2^+>$ state, i.e., the first radial excitation (2S) of $\Xi_c$. (iv) $\Xi_c(3055)$ is most likely to be the first $D$-wave excitation of $\Xi_c$ with $J^P=3/2^+$, favors the $|\Xi_c\ ^2D_{\lambda\lambda} 3/2^+>$ state. (v) $\Xi_c(3123)$ might be assigned to the $|\Xi_c'\ ^4D_{\lambda\lambda} 3/2^+>$, $|\Xi_c'\ ^4D_{\lambda\lambda} 5/2^+>$, or $|\Xi_c\ ^2D_{\rho\rho} 5/2^+>$ state. As a by-product, we calculate the strong decays of the bottom baryons $\Sigma_b^{\pm}$, $\Sigma_b^{*\pm}$ and $\Xi_b^*$, which are in good agreement with the recent observations as well. |
0911.3761 | Paramita Dey | Paramita Dey, Biswarup Mukhopadhyaya, Soumitra SenGupta | Bulk Higgs field in a Randall-Sundrum model with nonvanishing brane
cosmological constant | 7 pages, 2 tables, version accepted for publication | Phys.Rev.D81:036011,2010 | 10.1103/PhysRevD.81.036011 | PITHA 09/32, RECAPP-HRI-2009-021 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the possibility of Higgs mechanism in the bulk in a generalised
Randall-Sundrum model, where a nonvanishing cosmological constant is induced on
the visible brane. This scenario has the advantage of accommodating positive
tension of the visible brane and thus ensures stability of the model. It is
shown that several problems usually associated with this mechanism are avoided
if some dimensionful parameters in the bulk are allowed to lie a little below
the Planck mass. The most important of these is keeping the lowest massive mode
in the scale of the standard electroweak model, and at the same time reducing
the gauge coupling of the next excited state, thus ameliorating otherwise
stringent phenomenological constraints.
| [
{
"created": "Thu, 19 Nov 2009 11:19:05 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Feb 2010 13:21:50 GMT",
"version": "v2"
}
] | 2010-04-06 | [
[
"Dey",
"Paramita",
""
],
[
"Mukhopadhyaya",
"Biswarup",
""
],
[
"SenGupta",
"Soumitra",
""
]
] | We consider the possibility of Higgs mechanism in the bulk in a generalised Randall-Sundrum model, where a nonvanishing cosmological constant is induced on the visible brane. This scenario has the advantage of accommodating positive tension of the visible brane and thus ensures stability of the model. It is shown that several problems usually associated with this mechanism are avoided if some dimensionful parameters in the bulk are allowed to lie a little below the Planck mass. The most important of these is keeping the lowest massive mode in the scale of the standard electroweak model, and at the same time reducing the gauge coupling of the next excited state, thus ameliorating otherwise stringent phenomenological constraints. |
hep-ph/9604207 | Bernd Berg | Bernd A. Berg | New Algorithm to Investigate Neural Networks | 16 pages and 8 figures. Typos in eqn.(1) and various misleading
formulations eliminated | Comput.Phys.Commun. 98 (1996) 35-44 | 10.1016/0010-4655(96)00086-0 | null | hep-ph hep-lat | null | Random cost simulations were introduced as a method to investigate
optimization problems in systems with conflicting constraints. Here I study the
approach in connection with the training of a feed-forward multilayer
perceptron, as used in high energy physics applications. It is suggested to use
random cost simulations for generating a set of selected configurations. On
each of those final minimization may then be performed by a standard algorithm.
For the training example at hand many almost degenerate local minima are thus
found. Some effort is spend to discuss whether they lead to equivalent
classifications of the data.
| [
{
"created": "Mon, 1 Apr 1996 19:13:05 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Sep 1996 17:57:55 GMT",
"version": "v2"
}
] | 2009-10-28 | [
[
"Berg",
"Bernd A.",
""
]
] | Random cost simulations were introduced as a method to investigate optimization problems in systems with conflicting constraints. Here I study the approach in connection with the training of a feed-forward multilayer perceptron, as used in high energy physics applications. It is suggested to use random cost simulations for generating a set of selected configurations. On each of those final minimization may then be performed by a standard algorithm. For the training example at hand many almost degenerate local minima are thus found. Some effort is spend to discuss whether they lead to equivalent classifications of the data. |
1604.03017 | Stefano Frixione | Rikkert Frederix, Stefano Frixione, Eleni Vryonidou, Marius Wiesemann | Heavy-quark mass effects in Higgs plus jets production | 22 pages, 7 figures; 4 references and some clarifications added to
the text | null | 10.1007/JHEP08(2016)006 | CP3-16-11, MCNET-16-10, TUM-HEP-1040/16, ZU-TH-10/16 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the production of a Standard Model Higgs boson in the gluon-fusion
channel at the 13 TeV LHC. Our results are accurate to the next-to-leading
order in QCD, bar for the lack of some two-loop amplitudes, for up to two extra
jets and are matched to the PYTHIA8 Monte Carlo. We address the impact, at the
level of inclusive rates and of differential distributions, of the merging of
samples characterised by different final-state multiplicities, and of the
effects induced by top and bottom masses through heavy-quark loop diagrams. We
find that both the merging and the heavy-quark masses must be included in the
calculation in order to realistically predict observables of experimental
interest.
| [
{
"created": "Mon, 11 Apr 2016 16:14:19 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Aug 2016 09:49:17 GMT",
"version": "v2"
}
] | 2016-08-24 | [
[
"Frederix",
"Rikkert",
""
],
[
"Frixione",
"Stefano",
""
],
[
"Vryonidou",
"Eleni",
""
],
[
"Wiesemann",
"Marius",
""
]
] | We study the production of a Standard Model Higgs boson in the gluon-fusion channel at the 13 TeV LHC. Our results are accurate to the next-to-leading order in QCD, bar for the lack of some two-loop amplitudes, for up to two extra jets and are matched to the PYTHIA8 Monte Carlo. We address the impact, at the level of inclusive rates and of differential distributions, of the merging of samples characterised by different final-state multiplicities, and of the effects induced by top and bottom masses through heavy-quark loop diagrams. We find that both the merging and the heavy-quark masses must be included in the calculation in order to realistically predict observables of experimental interest. |
hep-ph/9708430 | Fernando Monti Steffens | F.M.Steffens (Uni. of Sao Paulo) | Heavy Quarks in Polarized Structure Functions | Revised version which appeared in Nucl. Phys. B523 (1998) 487 | Nucl.Phys.B523:487-500,1998 | 10.1016/S0550-3213(98)00114-X | null | hep-ph | null | Quark mass effects are included in the calculation of polarized structure
functions. In particular, the validity of fixed order perturbation theory and
of massless evolution is studied in the framework of heavy quarks structure
functions. The polarized version of the ACOT and MRRS interpolating schemes for
the evolution of massive quarks distributions is also developed and studied.
The different behaviours of the various approaches in $x$ and $Q^2$ are shown.
| [
{
"created": "Thu, 21 Aug 1997 20:33:11 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Oct 1998 16:04:14 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Steffens",
"F. M.",
"",
"Uni. of Sao Paulo"
]
] | Quark mass effects are included in the calculation of polarized structure functions. In particular, the validity of fixed order perturbation theory and of massless evolution is studied in the framework of heavy quarks structure functions. The polarized version of the ACOT and MRRS interpolating schemes for the evolution of massive quarks distributions is also developed and studied. The different behaviours of the various approaches in $x$ and $Q^2$ are shown. |
1605.09028 | Anton Rebhan | A. Rebhan | Scalar and tensor glueball decay rates from the Witten-Sakai-Sugimoto
model | 5 pages, to appear in the proceedings of the 51st Rencontres de
Moriond - QCD and High Energy Interactions | null | null | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The holographic Witten-Sakai-Sugimoto model is an almost parameter-free
approximation to large-N QCD with chiral quarks that in a number of cases gives
surprisingly good quantitative results for light meson physics. It also allows
for predictions of the decay rates of glueballs into pseudoscalar and vector
mesons through the coupling of modes on the flavor branes to the massive
gravitational modes in the bulk. Including effects from finite quark masses
leads to an enhancement of the decay of scalar glueballs into heavier
pseudoscalars in good agreement with the decay pattern observed for the scalar
glueball candidate f0(1710). Tensor glueballs are found to have a large width
when their masses are above the 2 rho and 2 K* thresholds. With a mass as
suggested by lattice gauge theory the lowest tensor glueball appears to be too
broad to be observable, in contrast to the pseudoscalar glueball which may be a
rather narrow state.
| [
{
"created": "Sun, 29 May 2016 16:53:56 GMT",
"version": "v1"
}
] | 2016-05-31 | [
[
"Rebhan",
"A.",
""
]
] | The holographic Witten-Sakai-Sugimoto model is an almost parameter-free approximation to large-N QCD with chiral quarks that in a number of cases gives surprisingly good quantitative results for light meson physics. It also allows for predictions of the decay rates of glueballs into pseudoscalar and vector mesons through the coupling of modes on the flavor branes to the massive gravitational modes in the bulk. Including effects from finite quark masses leads to an enhancement of the decay of scalar glueballs into heavier pseudoscalars in good agreement with the decay pattern observed for the scalar glueball candidate f0(1710). Tensor glueballs are found to have a large width when their masses are above the 2 rho and 2 K* thresholds. With a mass as suggested by lattice gauge theory the lowest tensor glueball appears to be too broad to be observable, in contrast to the pseudoscalar glueball which may be a rather narrow state. |
0804.2676 | Michael Rauch | W. Hollik, T. Plehn, M. Rauch, H. Rzehak | Supersymmetric Higgs Bosons in Weak Boson Fusion | 5 pages, 2 figures | Phys.Rev.Lett.102:091802,2009 | 10.1103/PhysRevLett.102.091802 | Edinburgh 2008/16, PSI-PR-08-05 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute the complete supersymmetric next-to-leading order corrections to
the production of a light Higgs boson in weak boson fusion. The size of the
electroweak corrections is of similar order as the next-to-leading order
corrections in the Standard Model. The supersymmetric QCD corrections turn out
to be significantly smaller than their electroweak counterparts. These
higher--order corrections are an important ingredient to a precision analysis
of the (supersymmetric) Higgs sector at the LHC, either as a known correction
factor or as a contribution to the theory error.
| [
{
"created": "Thu, 17 Apr 2008 18:04:54 GMT",
"version": "v1"
}
] | 2009-04-08 | [
[
"Hollik",
"W.",
""
],
[
"Plehn",
"T.",
""
],
[
"Rauch",
"M.",
""
],
[
"Rzehak",
"H.",
""
]
] | We compute the complete supersymmetric next-to-leading order corrections to the production of a light Higgs boson in weak boson fusion. The size of the electroweak corrections is of similar order as the next-to-leading order corrections in the Standard Model. The supersymmetric QCD corrections turn out to be significantly smaller than their electroweak counterparts. These higher--order corrections are an important ingredient to a precision analysis of the (supersymmetric) Higgs sector at the LHC, either as a known correction factor or as a contribution to the theory error. |
1908.10105 | Siamak Sadat Gousheh | S. Abbaslu, S. Rostam Zadeh and S. S. Gousheh | Contribution of the chiral vortical effect to the evolution of the
hypermagnetic field and the matter-antimatter asymmetry in the early Universe | 28 pages, 2 figures | Phys. Rev. D 100, 116022 (2019) | 10.1103/PhysRevD.100.116022 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we study the contribution of the chiral vortical effect, in
addition to that of the chiral magnetic effect, to the evolution of the
hypermagnetic field and the matter-antimatter asymmetry in the symmetric phase
of the early Universe in the temperature range 100GeV < T < 10TeV. We choose a
fully helical Chern-Simons wave configuration for the velocity and the
hypermagnetic vector potential fields. The latter makes the plasma force-free
in the absence of viscosity. We show that the most pronounced effect of the
chiral vorticity is the production and initial growth of the hypermagnetic
field. In particular, we show that in the presence of a non-zero matter
asymmetry, the hypermagnetic field can grow from zero initial value only in the
presence of a non-zero vorticity field. Moreover, we show that larger initial
growths not only result in larger maximum values of the hypermagnetic field,
but also cause the saturation of the hypermagnetic field and the conversion of
the lepton-baryon asymmetry to occur more quickly, i.e., at a higher
temperature. We show that the damping of the vorticity due to the presence of
viscosity, which typically occurs extremely rapidly, does not significantly
affect the evolution.
| [
{
"created": "Tue, 27 Aug 2019 09:39:33 GMT",
"version": "v1"
},
{
"created": "Fri, 10 Jan 2020 15:43:54 GMT",
"version": "v2"
}
] | 2020-01-13 | [
[
"Abbaslu",
"S.",
""
],
[
"Zadeh",
"S. Rostam",
""
],
[
"Gousheh",
"S. S.",
""
]
] | In this paper, we study the contribution of the chiral vortical effect, in addition to that of the chiral magnetic effect, to the evolution of the hypermagnetic field and the matter-antimatter asymmetry in the symmetric phase of the early Universe in the temperature range 100GeV < T < 10TeV. We choose a fully helical Chern-Simons wave configuration for the velocity and the hypermagnetic vector potential fields. The latter makes the plasma force-free in the absence of viscosity. We show that the most pronounced effect of the chiral vorticity is the production and initial growth of the hypermagnetic field. In particular, we show that in the presence of a non-zero matter asymmetry, the hypermagnetic field can grow from zero initial value only in the presence of a non-zero vorticity field. Moreover, we show that larger initial growths not only result in larger maximum values of the hypermagnetic field, but also cause the saturation of the hypermagnetic field and the conversion of the lepton-baryon asymmetry to occur more quickly, i.e., at a higher temperature. We show that the damping of the vorticity due to the presence of viscosity, which typically occurs extremely rapidly, does not significantly affect the evolution. |
1503.05923 | Zhen Liu | Zhen Liu, Brock Tweedie | The Fate of Long-Lived Superparticles with Hadronic Decays after LHC Run
1 | 36 pages, 10 figures, plus appendix and references | JHEP06(2015)042 | 10.1007/JHEP06(2015)042 | PITT PACC 1503, FERMILAB-PUB-15-087-T | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Supersymmetry searches at the LHC are both highly varied and highly
constraining, but the vast majority are focused on cases where the final-stage
visible decays are prompt. Scenarios featuring superparticles with
detector-scale lifetimes have therefore remained a tantalizing possibility for
sub-TeV SUSY, since explicit limits are relatively sparse. Nonetheless, the
extremely low backgrounds of the few existing searches for collider-stable and
displaced new particles facilitates recastings into powerful long-lived
superparticle searches, even for models for which those searches are highly
non-optimized. In this paper, we assess the status of such models in the
context of baryonic R-parity violation, gauge mediation, and mini-split SUSY.
We explore a number of common simplified spectra where hadronic decays can be
important, employing recasts of LHC searches that utilize different detector
systems and final-state objects. The LSP/NLSP possibilities considered here
include generic colored superparticles such as the gluino and light-flavor
squarks, as well as the lighter stop and the quasi-degenerate Higgsino
multiplet motivated by naturalness. We find that complementary coverage over
large swaths of mass and lifetime is achievable by superimposing limits,
particularly from CMS's tracker-based displaced dijet search and heavy stable
charged particle searches. Adding in prompt searches, we find many cases where
a range of sparticle masses is now excluded from zero lifetime to infinite
lifetime with no gaps. In other cases, the displaced searches furnish the only
extant limits at any lifetime.
| [
{
"created": "Thu, 19 Mar 2015 20:00:24 GMT",
"version": "v1"
}
] | 2015-06-15 | [
[
"Liu",
"Zhen",
""
],
[
"Tweedie",
"Brock",
""
]
] | Supersymmetry searches at the LHC are both highly varied and highly constraining, but the vast majority are focused on cases where the final-stage visible decays are prompt. Scenarios featuring superparticles with detector-scale lifetimes have therefore remained a tantalizing possibility for sub-TeV SUSY, since explicit limits are relatively sparse. Nonetheless, the extremely low backgrounds of the few existing searches for collider-stable and displaced new particles facilitates recastings into powerful long-lived superparticle searches, even for models for which those searches are highly non-optimized. In this paper, we assess the status of such models in the context of baryonic R-parity violation, gauge mediation, and mini-split SUSY. We explore a number of common simplified spectra where hadronic decays can be important, employing recasts of LHC searches that utilize different detector systems and final-state objects. The LSP/NLSP possibilities considered here include generic colored superparticles such as the gluino and light-flavor squarks, as well as the lighter stop and the quasi-degenerate Higgsino multiplet motivated by naturalness. We find that complementary coverage over large swaths of mass and lifetime is achievable by superimposing limits, particularly from CMS's tracker-based displaced dijet search and heavy stable charged particle searches. Adding in prompt searches, we find many cases where a range of sparticle masses is now excluded from zero lifetime to infinite lifetime with no gaps. In other cases, the displaced searches furnish the only extant limits at any lifetime. |
2108.04955 | Nikita Larin | Sergei P. Roshchupkin, Nikita R. Larin and Victor V. Dubov | Resonant photoproduction of ultrarelativistic electron-positron pairs on
a nucleus in strong monochromatic light field | null | null | 10.1103/PhysRevD.104.116011 | null | hep-ph physics.atom-ph | http://creativecommons.org/licenses/by/4.0/ | For complete development of quantum electrodynamics in the presence of a
strong external field, the proper understanding of resonant processes and all
their peculiarities is essential. We present our attempt to analytically
investigate the resonant case of laser-assisted electron-positron pair
photoproduction on a nucleus. Due to the presence of external field, the
intermediate virtual particle may become real, herewith the second order
process in the fine structure constant effectively reduces into the two
successive first order processes. All inherent kinematics features were
discussed in details and the resonant differential cross section was obtained.
We established that the resonant energies of produced particles ambiguously
depend on the positron (channel A) or electron (channel B) outgoing angle, and
the certain minimal amount of absorbed wave photons are required for resonance
to happen. Furthermore, the resonant cross section significantly exceeds the
corresponding one in the absence of the external field within the particular
kinematic regions and consequently, the considered process can be used qua a
marker for probing theoretical predictions of quantum electrodynamics with
strong background field.
| [
{
"created": "Tue, 10 Aug 2021 22:45:41 GMT",
"version": "v1"
}
] | 2022-01-05 | [
[
"Roshchupkin",
"Sergei P.",
""
],
[
"Larin",
"Nikita R.",
""
],
[
"Dubov",
"Victor V.",
""
]
] | For complete development of quantum electrodynamics in the presence of a strong external field, the proper understanding of resonant processes and all their peculiarities is essential. We present our attempt to analytically investigate the resonant case of laser-assisted electron-positron pair photoproduction on a nucleus. Due to the presence of external field, the intermediate virtual particle may become real, herewith the second order process in the fine structure constant effectively reduces into the two successive first order processes. All inherent kinematics features were discussed in details and the resonant differential cross section was obtained. We established that the resonant energies of produced particles ambiguously depend on the positron (channel A) or electron (channel B) outgoing angle, and the certain minimal amount of absorbed wave photons are required for resonance to happen. Furthermore, the resonant cross section significantly exceeds the corresponding one in the absence of the external field within the particular kinematic regions and consequently, the considered process can be used qua a marker for probing theoretical predictions of quantum electrodynamics with strong background field. |
hep-ph/9410336 | null | W. Grimus and H. Neufeld | Neutrinos interacting with Polarizable Media | 9 pages, UWThPh-1994-41 | null | null | null | hep-ph | null | We study Cherenkov and transition radiation of neutral spin 1/2 particles
which carry magnetic moments or electric dipole moments. In particular, we
estimate the radiation caused by the solar neutrino flux in dielectric media.
| [
{
"created": "Thu, 20 Oct 1994 17:58:54 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Grimus",
"W.",
""
],
[
"Neufeld",
"H.",
""
]
] | We study Cherenkov and transition radiation of neutral spin 1/2 particles which carry magnetic moments or electric dipole moments. In particular, we estimate the radiation caused by the solar neutrino flux in dielectric media. |
1307.5458 | Julien Billard | J. Billard (1), L. Strigari (2), E. Figueroa-Feliciano (1) ((1) MIT,
(2) KIPAC/Stanford) | Implication of neutrino backgrounds on the reach of next generation dark
matter direct detection experiments | 15 pages, 12 figures, 7Be fluxes revised, conclusions unchanged | Phys. Rev. D 89, 023524 (2014) | 10.1103/PhysRevD.89.023524 | null | hep-ph astro-ph.GA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | As direct dark matter experiments continue to increase in size, they will
become sensitive to neutrinos from astrophysical sources. For experiments that
do not have directional sensitivity, coherent neutrino scattering (CNS) from
several sources represents an important background to understand, as it can
almost perfectly mimic an authentic WIMP signal. Here we explore in detail the
effect of neutrino backgrounds on the discovery potential of WIMPs over the
entire mass range of 500 MeV to 10 TeV. We show that, given the theoretical and
measured uncertainties on the neutrino backgrounds, direct detection
experiments lose sensitivity to light (~10 GeV) and heavy (~100 GeV) WIMPs with
a spin-independent cross section below 10^{-45} cm^2 and 10^{-49} cm^2,
respectively.
| [
{
"created": "Sat, 20 Jul 2013 20:16:11 GMT",
"version": "v1"
},
{
"created": "Sun, 11 Aug 2013 15:59:55 GMT",
"version": "v2"
},
{
"created": "Sun, 19 Jan 2014 18:10:55 GMT",
"version": "v3"
}
] | 2015-06-16 | [
[
"Billard",
"J.",
""
],
[
"Strigari",
"L.",
""
],
[
"Figueroa-Feliciano",
"E.",
""
]
] | As direct dark matter experiments continue to increase in size, they will become sensitive to neutrinos from astrophysical sources. For experiments that do not have directional sensitivity, coherent neutrino scattering (CNS) from several sources represents an important background to understand, as it can almost perfectly mimic an authentic WIMP signal. Here we explore in detail the effect of neutrino backgrounds on the discovery potential of WIMPs over the entire mass range of 500 MeV to 10 TeV. We show that, given the theoretical and measured uncertainties on the neutrino backgrounds, direct detection experiments lose sensitivity to light (~10 GeV) and heavy (~100 GeV) WIMPs with a spin-independent cross section below 10^{-45} cm^2 and 10^{-49} cm^2, respectively. |
hep-ph/9905202 | Zurab Tavartkiladze | Qaisar Shafi and Zurab Tavartkiladze | Proton Decay, Neutrino Oscillations And Other Consequences From
Supersymmetric SU(6) With Pseudo-Goldstone Higgs | 20 pp. LATEX. Version with minor corrections accepted for Nucl. Phys.
B | Nucl.Phys.B573:40-56,2000 | 10.1016/S0550-3213(99)00606-9 | BA-99-39 | hep-ph | null | We suggest a new mechanism for naturally suppressing dimension five baryon
number violating in supersymmetric SU(5+N) (N=0, 1,...) GUTs. The mechanism is
realized through suppression of qqT type couplings, and is implemented by
introducing new `matter' multiplets belonging to symmetric representations of
SU(5+N). Together with the suppression of nucleon decay, these multiplets also
enable one to avoid the unwanted asymptotic mass relations $m_s=m_{\mu}$,
$\frac{m_d}{m_s}=\frac{m_e}{m_{\mu}}$.
As an example, we consider a SU(6) model with pseudo-Goldstone Higgs. By
supplementing the model with an anomalous ${\cal U}(1)$ flavor symmetry, we
also obtain a simple `all-order' solution of the gauge hierarchy problem and
natural explanation of charged fermion mass hierarchies and values of the CKM
matrix elements. The proton life time $\tau_p\sim 10^{2}\tau_p^{SU(5)}$~yr. is
compatible with experiments, with the dominant decay being $p\to K\nu_{\mu,
\tau}$. Thanks to the SU(6) symmetry, successful unification of the gauge
couplings can be retained, and the value of the strong coupling $\alpha_s(M_Z)$
can be reduced to $\simeq 0.12$.
Finally, we show how to accommodate the solar and atmospheric neutrino data
through the bi-maximal neutrino mixing scenario, with maximal vacuum
$\nu_e-\nu_{\mu, \tau}$ and large angle $\nu_{\mu}-\nu_{\tau}$ oscillations.
| [
{
"created": "Sat, 1 May 1999 18:42:15 GMT",
"version": "v1"
},
{
"created": "Sat, 18 Sep 1999 09:09:06 GMT",
"version": "v2"
}
] | 2011-05-12 | [
[
"Shafi",
"Qaisar",
""
],
[
"Tavartkiladze",
"Zurab",
""
]
] | We suggest a new mechanism for naturally suppressing dimension five baryon number violating in supersymmetric SU(5+N) (N=0, 1,...) GUTs. The mechanism is realized through suppression of qqT type couplings, and is implemented by introducing new `matter' multiplets belonging to symmetric representations of SU(5+N). Together with the suppression of nucleon decay, these multiplets also enable one to avoid the unwanted asymptotic mass relations $m_s=m_{\mu}$, $\frac{m_d}{m_s}=\frac{m_e}{m_{\mu}}$. As an example, we consider a SU(6) model with pseudo-Goldstone Higgs. By supplementing the model with an anomalous ${\cal U}(1)$ flavor symmetry, we also obtain a simple `all-order' solution of the gauge hierarchy problem and natural explanation of charged fermion mass hierarchies and values of the CKM matrix elements. The proton life time $\tau_p\sim 10^{2}\tau_p^{SU(5)}$~yr. is compatible with experiments, with the dominant decay being $p\to K\nu_{\mu, \tau}$. Thanks to the SU(6) symmetry, successful unification of the gauge couplings can be retained, and the value of the strong coupling $\alpha_s(M_Z)$ can be reduced to $\simeq 0.12$. Finally, we show how to accommodate the solar and atmospheric neutrino data through the bi-maximal neutrino mixing scenario, with maximal vacuum $\nu_e-\nu_{\mu, \tau}$ and large angle $\nu_{\mu}-\nu_{\tau}$ oscillations. |
1712.02659 | Georg Wolschin | Georg Wolschin | Equilibration in finite Bose systems | 26 pages, 7 figures | Physica A 499, 1 (2018) | 10.1016/j.physa.2018.01.035 | null | hep-ph math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The equilibration of a finite Bose system is modelled using a gradient
expansion of the collision integral that leads to a nonlinear transport
equation. For constant transport coefficients, it is solved in closed form
through a nonlinear transformation. Using schematic initial conditions, the
exact solution and the equilibration time are derived and compared to the
corresponding case for fermions. Applications to the equilibration of the gluon
system created initially in relativistic heavy-ion collisions, and to cold
quantum gases are envisaged.
| [
{
"created": "Thu, 7 Dec 2017 15:00:54 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Feb 2018 08:09:15 GMT",
"version": "v2"
}
] | 2018-02-12 | [
[
"Wolschin",
"Georg",
""
]
] | The equilibration of a finite Bose system is modelled using a gradient expansion of the collision integral that leads to a nonlinear transport equation. For constant transport coefficients, it is solved in closed form through a nonlinear transformation. Using schematic initial conditions, the exact solution and the equilibration time are derived and compared to the corresponding case for fermions. Applications to the equilibration of the gluon system created initially in relativistic heavy-ion collisions, and to cold quantum gases are envisaged. |
1701.04953 | Kouji Kashiwa | Kouji Kashiwa, Akira Ohnishi | Topological deconfinement transition in QCD at finite isospin density | 7 pages, 5 figures | Phys.Lett.B772:669-674,2017 | 10.1016/j.physletb.2017.07.033 | YITP-17-04 | hep-ph hep-lat hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The confinement-deconfinement transition is discussed from topological
viewpoints. The topological change of the system is achieved by introducing the
dimensionless imaginary chemical potential ($\theta$). Then, the non-trivial
free-energy degeneracy becomes the signal of the deconfinement transition and
it can be visualized by using the map of the thermodynamic quantities to the
circle $S^1$ along $\theta$. To understand this "topological" deconfinement
transition at finite real quark chemical potential ($\mu_\mathrm{R}$), we
consider the isospin chemical potential ($\mu_\mathrm{iso}$) in the effective
model of QCD. The phase diagram at finite $\mu_\mathrm{iso}$ is identical with
that at finite $\mu_\mathrm{R}$ outside of the pion-condensed phase at least in
the large-$N_\mathrm{c}$ limit via the well-known orbifold equivalence. In the
present effective model, the topological deconfinement transition does not show
a significant dependence on $\mu_\mathrm{iso}$ and then we can expect that this
tendency also appears at small $\mu_\mathrm{R}$. Also, the chiral transition
and the topological deconfinement transition seems to be weakly correlated. If
we will access lattice QCD data for the temperature dependence of the quark
number density at finite $\mu_\mathrm{iso}$ with $\theta=\pi/3$, our surmise
can be judged.
| [
{
"created": "Wed, 18 Jan 2017 05:41:36 GMT",
"version": "v1"
},
{
"created": "Thu, 11 May 2017 01:54:27 GMT",
"version": "v2"
},
{
"created": "Wed, 16 Aug 2017 08:35:09 GMT",
"version": "v3"
}
] | 2017-08-17 | [
[
"Kashiwa",
"Kouji",
""
],
[
"Ohnishi",
"Akira",
""
]
] | The confinement-deconfinement transition is discussed from topological viewpoints. The topological change of the system is achieved by introducing the dimensionless imaginary chemical potential ($\theta$). Then, the non-trivial free-energy degeneracy becomes the signal of the deconfinement transition and it can be visualized by using the map of the thermodynamic quantities to the circle $S^1$ along $\theta$. To understand this "topological" deconfinement transition at finite real quark chemical potential ($\mu_\mathrm{R}$), we consider the isospin chemical potential ($\mu_\mathrm{iso}$) in the effective model of QCD. The phase diagram at finite $\mu_\mathrm{iso}$ is identical with that at finite $\mu_\mathrm{R}$ outside of the pion-condensed phase at least in the large-$N_\mathrm{c}$ limit via the well-known orbifold equivalence. In the present effective model, the topological deconfinement transition does not show a significant dependence on $\mu_\mathrm{iso}$ and then we can expect that this tendency also appears at small $\mu_\mathrm{R}$. Also, the chiral transition and the topological deconfinement transition seems to be weakly correlated. If we will access lattice QCD data for the temperature dependence of the quark number density at finite $\mu_\mathrm{iso}$ with $\theta=\pi/3$, our surmise can be judged. |
1604.07896 | Masaki J.S. Yang | Masaki J. S. Yang | Hierarchical majorana neutrinos from democratic mass matrices | 14 pages, 1 table, substantially revised version | Phys.Lett.B 760 (2016) 747-752 | 10.1016/j.physletb.2016.06.079 | STUPP-16-227 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we obtain the light neutrino masses and mixings consistent
with the experiments, in the democratic texture approach. The essential ansatz
is that $\nu_{Ri}$ are assumed to transform as "right-handed fields" $\bf 2_{R}
+ 1_{R}$ under the $S_{3L} \times S_{3R}$ symmetry. The symmetry breaking terms
are assumed to be diagonal and hierarchical. This setup only allows the normal
hierarchy of the neutrino mass, and excludes both of inverted hierarchical and
degenerated neutrinos.
Although the neutrino sector has nine free parameters, several predictions
are obtained at the leading order. When we neglect the smallest parameters
$\zeta_{\nu}$ and $\zeta_{R}$, all components of the mixing matrix $U_{\rm
PMNS}$ are expressed by the masses of light neutrinos and charged leptons. From
the consistency between predicted and observed $U_{\rm PMNS}$, we obtain the
lightest neutrino masses $m_{1}$ = (1.1 $\to$ 1.4) meV, and the effective mass
for the double beta decay $\vev{m_{ee}} \simeq$ 4.5 meV.
| [
{
"created": "Wed, 27 Apr 2016 00:51:18 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Jun 2016 01:18:33 GMT",
"version": "v2"
}
] | 2020-05-28 | [
[
"Yang",
"Masaki J. S.",
""
]
] | In this paper, we obtain the light neutrino masses and mixings consistent with the experiments, in the democratic texture approach. The essential ansatz is that $\nu_{Ri}$ are assumed to transform as "right-handed fields" $\bf 2_{R} + 1_{R}$ under the $S_{3L} \times S_{3R}$ symmetry. The symmetry breaking terms are assumed to be diagonal and hierarchical. This setup only allows the normal hierarchy of the neutrino mass, and excludes both of inverted hierarchical and degenerated neutrinos. Although the neutrino sector has nine free parameters, several predictions are obtained at the leading order. When we neglect the smallest parameters $\zeta_{\nu}$ and $\zeta_{R}$, all components of the mixing matrix $U_{\rm PMNS}$ are expressed by the masses of light neutrinos and charged leptons. From the consistency between predicted and observed $U_{\rm PMNS}$, we obtain the lightest neutrino masses $m_{1}$ = (1.1 $\to$ 1.4) meV, and the effective mass for the double beta decay $\vev{m_{ee}} \simeq$ 4.5 meV. |
2004.00631 | Joel Doss | Timothy Cohen, Joel Doss, Marat Freytsis | Jet Substructure from Dark Sector Showers | 30 pages + appendix, 11 figures; v3: minor clarifications added | null | 10.1007/JHEP09(2020)118 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine the robustness of collider phenomenology predictions for a dark
sector scenario with QCD-like properties. Pair production of dark quarks at the
LHC can result in a wide variety of signatures, depending on the details of the
new physics model. A particularly challenging signal results when prompt
production induces a parton shower that yields a high multiplicity of
collimated dark hadrons with subsequent decays to Standard Model hadrons. The
final states contain jets whose substructure encodes their non-QCD origin. This
is a relatively subtle signature of strongly coupled beyond the Standard Model
dynamics, and thus it is crucial that analyses incorporate systematic errors to
account for the approximations that are being made when modeling the signal. We
estimate theoretical uncertainties for a canonical substructure observable
designed to be sensitive to the gauge structure of the underlying object, the
two-point energy correlator $e_2^{(\beta)}$, by computing envelopes between
resummed analytic distributions and numerical results from Pythia. We explore
the separability against the QCD background as the confinement scale, number of
colors, number of flavors, and dark quark masses are varied. Additionally, we
investigate the uncertainties inherent to modeling dark sector hadronization.
Simple estimates are provided that quantify one's ability to distinguish these
dark sector jets from the overwhelming QCD background. Such a search would
benefit from theory advances to improve the predictions, and the increase in
statistics using the data to be collected at the high luminosity LHC.
| [
{
"created": "Wed, 1 Apr 2020 18:00:01 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Dec 2020 15:56:05 GMT",
"version": "v2"
},
{
"created": "Mon, 6 Jun 2022 18:46:13 GMT",
"version": "v3"
}
] | 2022-06-08 | [
[
"Cohen",
"Timothy",
""
],
[
"Doss",
"Joel",
""
],
[
"Freytsis",
"Marat",
""
]
] | We examine the robustness of collider phenomenology predictions for a dark sector scenario with QCD-like properties. Pair production of dark quarks at the LHC can result in a wide variety of signatures, depending on the details of the new physics model. A particularly challenging signal results when prompt production induces a parton shower that yields a high multiplicity of collimated dark hadrons with subsequent decays to Standard Model hadrons. The final states contain jets whose substructure encodes their non-QCD origin. This is a relatively subtle signature of strongly coupled beyond the Standard Model dynamics, and thus it is crucial that analyses incorporate systematic errors to account for the approximations that are being made when modeling the signal. We estimate theoretical uncertainties for a canonical substructure observable designed to be sensitive to the gauge structure of the underlying object, the two-point energy correlator $e_2^{(\beta)}$, by computing envelopes between resummed analytic distributions and numerical results from Pythia. We explore the separability against the QCD background as the confinement scale, number of colors, number of flavors, and dark quark masses are varied. Additionally, we investigate the uncertainties inherent to modeling dark sector hadronization. Simple estimates are provided that quantify one's ability to distinguish these dark sector jets from the overwhelming QCD background. Such a search would benefit from theory advances to improve the predictions, and the increase in statistics using the data to be collected at the high luminosity LHC. |
1008.4641 | Ken-iti Izawa | K.-I. Izawa, T. Kugo, T.T. Yanagida | Gravitational Supersymmetry Breaking | 6 pages | Prog.Theor.Phys.125:261-264,2011 | 10.1143/PTP.125.261 | YITP-10-73, IPMU 10-0143 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider supersymmetry breaking models with a purely constant
superpotential in supergravity. The supersymmetry breaking is induced for the
vanishing cosmological constant. As a hidden mediation sector of supersymmetry
breaking, it naturally leads to a split spectrum in supersymmetric standard
model. We also point out possible utility of our setup to construct nonlinear
sigma model and/or Fayet-Iliopoulos-like term in broken supergravity.
| [
{
"created": "Fri, 27 Aug 2010 04:57:43 GMT",
"version": "v1"
}
] | 2011-05-09 | [
[
"Izawa",
"K. -I.",
""
],
[
"Kugo",
"T.",
""
],
[
"Yanagida",
"T. T.",
""
]
] | We consider supersymmetry breaking models with a purely constant superpotential in supergravity. The supersymmetry breaking is induced for the vanishing cosmological constant. As a hidden mediation sector of supersymmetry breaking, it naturally leads to a split spectrum in supersymmetric standard model. We also point out possible utility of our setup to construct nonlinear sigma model and/or Fayet-Iliopoulos-like term in broken supergravity. |
1311.3714 | Xiao-Gang He | Dong Xu, Guan-Nan Li, Xiao-Gang He | U-spin analysis of CP violation in $B^- $ decays into three charged
light pseudoscalar mesons | RevTex 12 pages wit no figure | null | 10.1016/j.physletb.2013.12.040 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We carry out a $U$-spin symmetry analysis for CP violation in $B^- $ decays
into three light $\pi^-\pi^-\pi^+$, $\pi^- K^-K^+$, $K^-K^-K^+$ and $K^-
\pi^-\pi^+$ mesons. We clarify some subtle points in constructing decay
amplitudes with $U=0$ formed by the two negatively charged light mesons in the
final states. $U$-spin conserving momentum independent and momentum dependent
decay amplitudes, and $U$-spin violating decay amplitudes due to quark mass
difference are constructed.
| [
{
"created": "Fri, 15 Nov 2013 03:29:59 GMT",
"version": "v1"
}
] | 2015-06-17 | [
[
"Xu",
"Dong",
""
],
[
"Li",
"Guan-Nan",
""
],
[
"He",
"Xiao-Gang",
""
]
] | We carry out a $U$-spin symmetry analysis for CP violation in $B^- $ decays into three light $\pi^-\pi^-\pi^+$, $\pi^- K^-K^+$, $K^-K^-K^+$ and $K^- \pi^-\pi^+$ mesons. We clarify some subtle points in constructing decay amplitudes with $U=0$ formed by the two negatively charged light mesons in the final states. $U$-spin conserving momentum independent and momentum dependent decay amplitudes, and $U$-spin violating decay amplitudes due to quark mass difference are constructed. |
hep-ph/9902362 | Emidio Gabrielli | E. Gabrielli, V.A. Ilyin and B. Mele | Looking for anomalous gamma-gamma-H and Z-gamma-H couplings at future
linear collider | LaTeX, 33 pages, 16 eps figures, extended section 5 | Phys.Rev.D60:113005,1999 | 10.1103/PhysRevD.60.113005 | ROME1-1235/99 | hep-ph | null | We consider the possibility of studying anomalous contributions to the
gamma-gamma-H and Z-gamma-H vertices through the process e-gamma--> e-H at
future e-gamma linear colliders, with Sqrt(S)=500-1500 GeV. We make a model
independent analysis based on SU(2)xU(1) invariant effective operators of dim=6
added to the standard model lagrangian. We consider a light Higgs boson (mostly
decaying in bar(b)-b pairs), and include all the relevant backgrounds. Initial
e-beam polarization effects are also analyzed. We find that the process
e-gamma--> e-H provides an excellent opportunity to strongly constrain both the
CP-even and the CP-odd anomalous contributions to the gamma-gamma-H and
Z-gamma-H vertices.
| [
{
"created": "Tue, 16 Feb 1999 15:06:00 GMT",
"version": "v1"
},
{
"created": "Wed, 1 Dec 1999 12:35:47 GMT",
"version": "v2"
}
] | 2011-07-19 | [
[
"Gabrielli",
"E.",
""
],
[
"Ilyin",
"V. A.",
""
],
[
"Mele",
"B.",
""
]
] | We consider the possibility of studying anomalous contributions to the gamma-gamma-H and Z-gamma-H vertices through the process e-gamma--> e-H at future e-gamma linear colliders, with Sqrt(S)=500-1500 GeV. We make a model independent analysis based on SU(2)xU(1) invariant effective operators of dim=6 added to the standard model lagrangian. We consider a light Higgs boson (mostly decaying in bar(b)-b pairs), and include all the relevant backgrounds. Initial e-beam polarization effects are also analyzed. We find that the process e-gamma--> e-H provides an excellent opportunity to strongly constrain both the CP-even and the CP-odd anomalous contributions to the gamma-gamma-H and Z-gamma-H vertices. |
1507.01409 | Ajay Kumar Rai | Ajay Kumar Rai and D. P. Rathaud | The mass spectra and decay properties of dimesonic states, using the
Hellmann potential | 11 pages, 4 tables | Eur. Phys. J. C 75 (2015) 9, 462 | 10.1140/epjc/s10052-015-3695-z | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Mass spectra of the dimesonic (meson-antimeson) molecular states are computed
using the Hellmann potential in variational approach, which consists of
relativistic correction to kinetic energy term as well as to the potential
energy term. For the study of molecular bound state system, the Hellmann
potential of the form $V(r)=-\frac{\alpha_{s}}{r} + \frac{B e^{-Cr}}{r}$ is
being used. The one pion exchange potential (OPEP) is also incorporated in the
mass calculation. The digamma decay width and decay width of the dimesonic
system are evaluated using the wave function. The experimental states such as
$f_{0}(980)$, $b_{1}(1235)$, $h_{1}(1380)$, $a_{0}(1450)$, $f_{0}(1500)$,
$f_{2}'(1525)$,$f_{2}(1565)$, $h_{1}(1595)$, $a_{2}(1700)$, $f_{0}(1710)$,
$f_{2}(1810)$ are compared with dimesonic states. Many of these states (masses
and their decay properties) are close to our theoretical predictions.
| [
{
"created": "Mon, 6 Jul 2015 12:13:57 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Sep 2015 09:52:19 GMT",
"version": "v2"
}
] | 2015-10-14 | [
[
"Rai",
"Ajay Kumar",
""
],
[
"Rathaud",
"D. P.",
""
]
] | Mass spectra of the dimesonic (meson-antimeson) molecular states are computed using the Hellmann potential in variational approach, which consists of relativistic correction to kinetic energy term as well as to the potential energy term. For the study of molecular bound state system, the Hellmann potential of the form $V(r)=-\frac{\alpha_{s}}{r} + \frac{B e^{-Cr}}{r}$ is being used. The one pion exchange potential (OPEP) is also incorporated in the mass calculation. The digamma decay width and decay width of the dimesonic system are evaluated using the wave function. The experimental states such as $f_{0}(980)$, $b_{1}(1235)$, $h_{1}(1380)$, $a_{0}(1450)$, $f_{0}(1500)$, $f_{2}'(1525)$,$f_{2}(1565)$, $h_{1}(1595)$, $a_{2}(1700)$, $f_{0}(1710)$, $f_{2}(1810)$ are compared with dimesonic states. Many of these states (masses and their decay properties) are close to our theoretical predictions. |
0909.2199 | Enrico Scomparin | R.Arnaldi, P.Cortese and E. Scomparin | Role of parton shadowing in the comparison of p-A and A-A results on
jpsi suppression at energies available at the CERN Super Proton Synchrotron | 6 pages, 6 figures, final version published in Phys. Rev. C 81 (2010)
014903 | Phys.Rev.C81:014903,2010 | 10.1103/PhysRevC.81.014903 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The observation of an anomalous jpsi suppression in nucleus-nucleus
collisions is one of the most important results of the SPS heavy-ion program.
An essential ingredient in this result is the determination, obtained by
studying p-A collisions, of effects not related with the formation of a
deconfined medium. These effects are extrapolated to A-A collisions,
determining a reference jpsi yield that is then compared with the measurements.
In this article we investigate the role of parton shadowing on the
determination of such a reference, and we calculate its effect for In-In and
Pb-Pb collisions as a function of rapidity and centrality.
| [
{
"created": "Fri, 11 Sep 2009 15:42:16 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Sep 2009 10:03:34 GMT",
"version": "v2"
},
{
"created": "Thu, 14 Jan 2010 09:51:24 GMT",
"version": "v3"
}
] | 2010-04-06 | [
[
"Arnaldi",
"R.",
""
],
[
"Cortese",
"P.",
""
],
[
"Scomparin",
"E.",
""
]
] | The observation of an anomalous jpsi suppression in nucleus-nucleus collisions is one of the most important results of the SPS heavy-ion program. An essential ingredient in this result is the determination, obtained by studying p-A collisions, of effects not related with the formation of a deconfined medium. These effects are extrapolated to A-A collisions, determining a reference jpsi yield that is then compared with the measurements. In this article we investigate the role of parton shadowing on the determination of such a reference, and we calculate its effect for In-In and Pb-Pb collisions as a function of rapidity and centrality. |
1411.2786 | Farvah Mahmoudi | T. Hurth, F. Mahmoudi | Signs for new physics in the recent LHCb data? | 6 pages, 6 figures. Based on talks given at the Fifth Workshop on
Theory, Phenomenology and Experiments in Flavour Physics, Capri, 23-25 May
2014 and at the FPCP 2014 conference on Flavor Physics and CP Violation,
Marseille, 25-30 May 2014 | null | null | CERN-PH-TH/2014-212, MITP/14-087 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We comment on some tensions with the Standard Model predictions in the recent
LHCb data.
| [
{
"created": "Tue, 11 Nov 2014 12:54:08 GMT",
"version": "v1"
}
] | 2014-11-12 | [
[
"Hurth",
"T.",
""
],
[
"Mahmoudi",
"F.",
""
]
] | We comment on some tensions with the Standard Model predictions in the recent LHCb data. |
2211.14792 | Qi Zhou | Qi Zhou and Ben-Wei Zhang | Holographic energy loss near critical temperature in an anisotropic
background | 10 pages,5 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the energy loss of a quark moving in a strongly coupled QGP under
the influence of anisotropy. The heavy quark drag force, diffusion coefficient,
and jet quenching parameter are calculated using the Einstein-Maxwell-dilaton
model, where the anisotropic background is characterized by an arbitrary
dynamical parameter $A$.Our findings indicate that as the anisotropic factor
$A$ increases, the drag force and jet quenching parameter both increase, while
the diffusion coefficient decreases. Additionally, we observe that the energy
loss becomes more significant when the quark moves perpendicular to the
anisotropy direction in the transverse plane.The enhancement of the rescaled
jet quenching parameters near critical temperature $T_c$, as well as drag
forces for a fast-moving heavy quark is observed, which presents one of the
typical features of QCD phase transition.
| [
{
"created": "Sun, 27 Nov 2022 11:14:34 GMT",
"version": "v1"
},
{
"created": "Sun, 1 Jan 2023 03:34:59 GMT",
"version": "v2"
},
{
"created": "Tue, 25 Jul 2023 07:54:10 GMT",
"version": "v3"
}
] | 2023-07-26 | [
[
"Zhou",
"Qi",
""
],
[
"Zhang",
"Ben-Wei",
""
]
] | We study the energy loss of a quark moving in a strongly coupled QGP under the influence of anisotropy. The heavy quark drag force, diffusion coefficient, and jet quenching parameter are calculated using the Einstein-Maxwell-dilaton model, where the anisotropic background is characterized by an arbitrary dynamical parameter $A$.Our findings indicate that as the anisotropic factor $A$ increases, the drag force and jet quenching parameter both increase, while the diffusion coefficient decreases. Additionally, we observe that the energy loss becomes more significant when the quark moves perpendicular to the anisotropy direction in the transverse plane.The enhancement of the rescaled jet quenching parameters near critical temperature $T_c$, as well as drag forces for a fast-moving heavy quark is observed, which presents one of the typical features of QCD phase transition. |
hep-ph/9903342 | Josephine Bolosan | S. F. Tuan (University of Hawaii) | Implications of a $\chi(3.86)$ State for Theoretical Models | 7 pages, LATEX format, no figures, no tables | Phys.Lett. B473 (2000) 136-140 | 10.1016/S0370-2693(99)01428-8 | UH511-909-98 | hep-ph | null | Recent preliminary evidence for a $D \bar{D}$ state $\chi(3.86)$ raises
extremely interesting implications for theoretical models, particularly those
currently in vogue, e.g. the flux tube model and a molecular charmonium
picture. We examine the experimental consequences as well as the possible
unveiling of a strata of C-exotic states in heavy quarkonia systems by future
facilities like BES Upgrade/Tau-Charm Factory and CLEO III/B-Factories.
| [
{
"created": "Fri, 12 Mar 1999 21:03:22 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Tuan",
"S. F.",
"",
"University of Hawaii"
]
] | Recent preliminary evidence for a $D \bar{D}$ state $\chi(3.86)$ raises extremely interesting implications for theoretical models, particularly those currently in vogue, e.g. the flux tube model and a molecular charmonium picture. We examine the experimental consequences as well as the possible unveiling of a strata of C-exotic states in heavy quarkonia systems by future facilities like BES Upgrade/Tau-Charm Factory and CLEO III/B-Factories. |
hep-ph/9511261 | null | A.I. Davydychev and J.B. Tausk | Tensor reduction of two-loop vacuum diagrams and projectors for
expanding three-point functions | 13 pages, plain latex, no figures | Nucl.Phys. B465 (1996) 507-520 | 10.1016/0550-3213(96)00033-8 | BERGEN-1995-14, MZ-TH-95-26 | hep-ph hep-th | null | Explicit general formulae for the tensor reduction of two-loop massive vacuum
diagrams are presented. The problem of calculating the corresponding
coefficients is shown to be equivalent to the problem of constructing
differential operators (projectors) extracting the coefficients of the momentum
expansion of massive scalar three-point functions (with any number of loops),
so the solution to the latter problem is also given.
| [
{
"created": "Tue, 7 Nov 1995 19:37:56 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Davydychev",
"A. I.",
""
],
[
"Tausk",
"J. B.",
""
]
] | Explicit general formulae for the tensor reduction of two-loop massive vacuum diagrams are presented. The problem of calculating the corresponding coefficients is shown to be equivalent to the problem of constructing differential operators (projectors) extracting the coefficients of the momentum expansion of massive scalar three-point functions (with any number of loops), so the solution to the latter problem is also given. |
hep-ph/0511064 | Ulrich Baur | U. Baur | Electroweak Physics at the Tevatron and LHC: Theoretical Status and
Perspectives | 6 pages, 6 figures, to appear in the Proceedings of the HCP2005
Conference, Les Diablerets, Switzerland, 4-9 July 2005 | null | null | null | hep-ph | null | I review the status of theoretical calculations relevant for electroweak
physics at the Tevatron and LHC and discuss future directions. I also give a
brief overview of current electroweak data and discuss future expectations.
| [
{
"created": "Mon, 7 Nov 2005 01:30:17 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Baur",
"U.",
""
]
] | I review the status of theoretical calculations relevant for electroweak physics at the Tevatron and LHC and discuss future directions. I also give a brief overview of current electroweak data and discuss future expectations. |
hep-ph/0202067 | Manfred Dillig | M. Dillig (Erlangen University) | Systematics of the Exclusive Meson Production in the Proton-Proton
System in Relativistic Quark-Models | 13 pages, 11 figures | null | null | FAU-TP3-02-02 | hep-ph | null | We investigate the exclusive production of the pseudoscalar mesons pi0, eta,
eta', K+ and of the vector mesons omega, phi in a microscopic gluon-exchange or
instanton model. We describe the baryons as covariant quark - scalar diquark
systems with harmonic confinement, thus taking into account center-of-mass
corrections and Lorentz contraction in different frames. The excitation of
intermediate baryon resonances is accounted by colorless 2-gluon (soft Pomeron)
exchange. We find that our model accounts for the systematics of the high
precision data on exclusive meson production from various modern proton
factories.
| [
{
"created": "Thu, 7 Feb 2002 14:45:23 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Feb 2002 17:55:10 GMT",
"version": "v2"
},
{
"created": "Fri, 22 Feb 2002 14:15:02 GMT",
"version": "v3"
}
] | 2009-09-29 | [
[
"Dillig",
"M.",
"",
"Erlangen University"
]
] | We investigate the exclusive production of the pseudoscalar mesons pi0, eta, eta', K+ and of the vector mesons omega, phi in a microscopic gluon-exchange or instanton model. We describe the baryons as covariant quark - scalar diquark systems with harmonic confinement, thus taking into account center-of-mass corrections and Lorentz contraction in different frames. The excitation of intermediate baryon resonances is accounted by colorless 2-gluon (soft Pomeron) exchange. We find that our model accounts for the systematics of the high precision data on exclusive meson production from various modern proton factories. |
0811.3849 | Vitaly Okorokov A | V.A. Okorokov | Slope analysis for elastic proton-proton and proton-antiproton
scattering | The XIX International Baldin Seminar on High Energy Physics Problems
"Relativistic Nuclear Physics and Quantum Chromodynamics", JINR, Dubna,
Russia, September 29 to October 4, 2008 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The diffraction slope parameter is investigated for elastic proton-proton and
proton-antiproton scattering based on the all available experimental data at
intermediate square of momentum transfer in the main. Energy dependence of the
elastic diffraction slope is approximated by various analytic functions in a
model-independent fashion. The expanded standard logarithmic approximations
allow to describe experimental slopes in all available energy range at
qualitative level reasonably. Various fitting functions differ from each other
both in low energy and very high energy domains. Predictions for diffraction
slope parameter are obtained for elastic proton-proton scattering at NICA, RHIC
and LHC energies, for proton-antiproton elastic reaction in FAIR energy domain
for various approximation functions at intermediate square of momentum
transfer. Difference of nuclear slopes for proton-antiproton and proton-proton
scattering is investigated in wide momentum transfer range also.
| [
{
"created": "Mon, 24 Nov 2008 11:43:57 GMT",
"version": "v1"
},
{
"created": "Wed, 3 Dec 2008 11:05:25 GMT",
"version": "v2"
}
] | 2008-12-03 | [
[
"Okorokov",
"V. A.",
""
]
] | The diffraction slope parameter is investigated for elastic proton-proton and proton-antiproton scattering based on the all available experimental data at intermediate square of momentum transfer in the main. Energy dependence of the elastic diffraction slope is approximated by various analytic functions in a model-independent fashion. The expanded standard logarithmic approximations allow to describe experimental slopes in all available energy range at qualitative level reasonably. Various fitting functions differ from each other both in low energy and very high energy domains. Predictions for diffraction slope parameter are obtained for elastic proton-proton scattering at NICA, RHIC and LHC energies, for proton-antiproton elastic reaction in FAIR energy domain for various approximation functions at intermediate square of momentum transfer. Difference of nuclear slopes for proton-antiproton and proton-proton scattering is investigated in wide momentum transfer range also. |
hep-ph/9409403 | null | Dean Lee | Mesons with a Light Quark-Antiquark Pair and the Bethe-Salpeter Equation | 9 pages uuencoded, unix compressed Postscript, HUTP-94/A030 | null | null | null | hep-ph | null | The light quark-antiquark scattering Green's function is considered near a
meson resonance peak. The Bethe-Salpeter equation is used to write formal
expressions for the resonance width/mass ratio. Arguments are made concerning
to what extent this ratio can be calculated perturbatively, and an upper bound
is placed on the growth of this ratio as a function of radial excitation.
Certain mesons and their radial excitations are considered, as well as the more
general issue of classifying mesons in the quark model.
| [
{
"created": "Sat, 24 Sep 1994 04:16:00 GMT",
"version": "v1"
},
{
"created": "Sat, 24 Sep 1994 04:36:38 GMT",
"version": "v2"
}
] | 2008-02-03 | [
[
"Lee",
"Dean",
""
]
] | The light quark-antiquark scattering Green's function is considered near a meson resonance peak. The Bethe-Salpeter equation is used to write formal expressions for the resonance width/mass ratio. Arguments are made concerning to what extent this ratio can be calculated perturbatively, and an upper bound is placed on the growth of this ratio as a function of radial excitation. Certain mesons and their radial excitations are considered, as well as the more general issue of classifying mesons in the quark model. |
hep-ph/9810252 | Tonguc Rador | Tonguc Rador | Lepton Number Violation in Top-Color Assisted Technicolor | 10 pages, 2 figures, uses revtex | Phys. Rev. D 59, 095012 (1999) | 10.1103/PhysRevD.59.095012 | null | hep-ph | null | We calculate the rates for lepton number violating processes via the exchange
of the Z' boson occuring in top-color assisted technicolor. The current
experimental limits on muon electron conversion in Ti nuclei allow for a mass
of the new gauge boson around 1 TeV and the magnitudes of the mixing angles
turn out to lie roughly between the analogous elements of the CKM matrix and
its square root.
| [
{
"created": "Mon, 5 Oct 1998 18:42:29 GMT",
"version": "v1"
}
] | 2016-08-25 | [
[
"Rador",
"Tonguc",
""
]
] | We calculate the rates for lepton number violating processes via the exchange of the Z' boson occuring in top-color assisted technicolor. The current experimental limits on muon electron conversion in Ti nuclei allow for a mass of the new gauge boson around 1 TeV and the magnitudes of the mixing angles turn out to lie roughly between the analogous elements of the CKM matrix and its square root. |
1102.4011 | Benjamin Grinstein | Benjamin Grinstein | What if? On the interplay between Serendipity, Intuition and Conjecture | Talk give at the conference on Flavor Physics and CP Violation - FPCP
2010, May 25-29, 2010, Turin, Italy | PoS FPCP2010:060,2010 | null | UCSD/PTH 10-15 | hep-ph hep-ex hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | While the Standard Model is in good shape, there are many reasons to believe
it is incomplete. There are high expectations that the LHC will shed light on
some well studied possibilities, like technicolor and supersymmetry. Emboldened
by this optimism, we consider some non-mainstream ideas that if established
would change dramatically the way we view the world.
| [
{
"created": "Sat, 19 Feb 2011 18:23:36 GMT",
"version": "v1"
}
] | 2011-11-10 | [
[
"Grinstein",
"Benjamin",
""
]
] | While the Standard Model is in good shape, there are many reasons to believe it is incomplete. There are high expectations that the LHC will shed light on some well studied possibilities, like technicolor and supersymmetry. Emboldened by this optimism, we consider some non-mainstream ideas that if established would change dramatically the way we view the world. |
hep-ph/0301142 | Arnd Brandenburg | A. Brandenburg, M. Maniatis | SUSY QCD corrections to the polarization and spin correlations of top
quarks produced in e+e- collisions | 15 pages, 10 ps figures | Phys.Lett. B558 (2003) 79-91 | 10.1016/S0370-2693(03)00210-7 | DESY 03-004 | hep-ph | null | We compute the supersymmetric QCD corrections to the polarization and the
spin correlations of top quarks produced above threshold in e+e- collisions,
taking into account arbitrary longitudinal polarization of the initial beams.
| [
{
"created": "Fri, 17 Jan 2003 18:17:38 GMT",
"version": "v1"
}
] | 2010-04-05 | [
[
"Brandenburg",
"A.",
""
],
[
"Maniatis",
"M.",
""
]
] | We compute the supersymmetric QCD corrections to the polarization and the spin correlations of top quarks produced above threshold in e+e- collisions, taking into account arbitrary longitudinal polarization of the initial beams. |
1006.1113 | Eligio Lisi | G.L. Fogli, E. Lisi, A. Palazzo, A.M. Rotunno | Combined analysis of KamLAND and Borexino neutrino signals from Th and U
decays in the Earth's interior | 12 pages, including 6 figures | Phys.Rev.D82:093006,2010 | 10.1103/PhysRevD.82.093006 | null | hep-ph hep-ex nucl-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The KamLAND and Borexino experiments have detected electron antineutrinos
produced in the decay chains of natural thorium and uranium (Th and U
geoneutrinos). We analyze the energy spectra of current geoneutrino data in
combination with solar and long-baseline reactor neutrino data, with
marginalized three-neutrino oscillation parameters. We consider the case with
unconstrained Th and U event rates in KamLAND and Borexino, as well as cases
with fewer degrees of freedom, as obtained by successively assuming for both
experiments a common Th/U ratio, a common scaling of Th+U event rates, and a
chondritic Th/U value. In combination, KamLAND and Borexino can reject the null
hypothesis (no geoneutrino signal) at 5 sigma. Interesting bounds or
indications emerge on the Th+U geoneutrino rates and on the Th/U ratio, in
broad agreement with typical Earth model expectations. Conversely, the results
disfavor the hypothesis of a georeactor in the Earth's core, if its power
exceeds a few TW. The interplay of KamLAND and Borexino geoneutrino data is
highlighted.
| [
{
"created": "Sun, 6 Jun 2010 16:30:58 GMT",
"version": "v1"
}
] | 2010-12-13 | [
[
"Fogli",
"G. L.",
""
],
[
"Lisi",
"E.",
""
],
[
"Palazzo",
"A.",
""
],
[
"Rotunno",
"A. M.",
""
]
] | The KamLAND and Borexino experiments have detected electron antineutrinos produced in the decay chains of natural thorium and uranium (Th and U geoneutrinos). We analyze the energy spectra of current geoneutrino data in combination with solar and long-baseline reactor neutrino data, with marginalized three-neutrino oscillation parameters. We consider the case with unconstrained Th and U event rates in KamLAND and Borexino, as well as cases with fewer degrees of freedom, as obtained by successively assuming for both experiments a common Th/U ratio, a common scaling of Th+U event rates, and a chondritic Th/U value. In combination, KamLAND and Borexino can reject the null hypothesis (no geoneutrino signal) at 5 sigma. Interesting bounds or indications emerge on the Th+U geoneutrino rates and on the Th/U ratio, in broad agreement with typical Earth model expectations. Conversely, the results disfavor the hypothesis of a georeactor in the Earth's core, if its power exceeds a few TW. The interplay of KamLAND and Borexino geoneutrino data is highlighted. |
hep-ph/0402208 | Stefano Profumo | S. Profumo, C. E. Yaguna | Gluino Annihilations and Neutralino Dark Matter | 13 pages, 6 figures; v4: one figure added, discussion enlarged; final
version to appear in Phys. Rev. D | Phys.Rev. D69 (2004) 115009 | 10.1103/PhysRevD.69.115009 | SISSA 15/2004/EP | hep-ph | null | We consider supersymmetric scenarios, compatible with all cosmological and
phenomenological requirements, where the lightest SUSY particles (LSPs) are the
neutralino and a quasi degenerate gluino. We study the neutralino relic
abundance, focusing on gluino (co-)annihilation effects. In case the neutralino
is bino-like, in a wide mass window the relic abundance is naturally driven in
the correct range for the LSP to be the main cold dark matter constituent. We
show that the gluino is the strongest possible coannihilating partner of a
bino-like neutralino in the general MSSM. Moreover, contrary to other
coannihilation scenarios, gluino pair annihilations always dominate over
coannihilation processes, even at relatively large gluino-neutralino mass
splittings. Finally, we present prospects for neutralino dark matter detection
in the outlined framework.
| [
{
"created": "Thu, 19 Feb 2004 11:50:45 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Feb 2004 15:26:16 GMT",
"version": "v2"
},
{
"created": "Wed, 3 Mar 2004 14:11:58 GMT",
"version": "v3"
},
{
"created": "Thu, 15 Apr 2004 14:57:26 GMT",
"version": "v4"
}
] | 2007-05-23 | [
[
"Profumo",
"S.",
""
],
[
"Yaguna",
"C. E.",
""
]
] | We consider supersymmetric scenarios, compatible with all cosmological and phenomenological requirements, where the lightest SUSY particles (LSPs) are the neutralino and a quasi degenerate gluino. We study the neutralino relic abundance, focusing on gluino (co-)annihilation effects. In case the neutralino is bino-like, in a wide mass window the relic abundance is naturally driven in the correct range for the LSP to be the main cold dark matter constituent. We show that the gluino is the strongest possible coannihilating partner of a bino-like neutralino in the general MSSM. Moreover, contrary to other coannihilation scenarios, gluino pair annihilations always dominate over coannihilation processes, even at relatively large gluino-neutralino mass splittings. Finally, we present prospects for neutralino dark matter detection in the outlined framework. |
hep-ph/0205035 | John F. Beacom | Matthew K. Sharp, John F. Beacom, Joseph A. Formaggio | Potential for Supernova Neutrino Detection in MiniBooNE | Added references, version to appear in PRD | Phys.Rev. D66 (2002) 013012 | 10.1103/PhysRevD.66.013012 | FERMILAB-Pub-02/073-A | hep-ph astro-ph hep-ex nucl-ex | null | The MiniBooNE detector at Fermilab is designed to search for $\nu_\mu \to
\nu_e$ oscillation appearance at $E_\nu \sim 1 {\rm GeV}$ and to make a
decisive test of the LSND signal. The main detector (inside a veto shield) is a
spherical volume containing 0.680 ktons of mineral oil. This inner volume,
viewed by 1280 phototubes, is primarily a \v{C}erenkov medium, as the
scintillation yield is low. The entire detector is under a 3 m earth
overburden. Though the detector is not optimized for low-energy (tens of MeV)
events, and the cosmic-ray muon rate is high (10 kHz), we show that MiniBooNE
can function as a useful supernova neutrino detector. Simple trigger-level cuts
can greatly reduce the backgrounds due to cosmic-ray muons. For a canonical
Galactic supernova at 10 kpc, about 190 supernova $\bar{\nu}_e + p \to e^+ + n$
events would be detected. By adding MiniBooNE to the international network of
supernova detectors, the possibility of a supernova being missed would be
reduced. Additionally, the paths of the supernova neutrinos through Earth will
be different for MiniBooNE and other detectors, thus allowing tests of
matter-affected mixing effects on the neutrino signal.
| [
{
"created": "Fri, 3 May 2002 19:44:18 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Jul 2002 17:11:21 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Sharp",
"Matthew K.",
""
],
[
"Beacom",
"John F.",
""
],
[
"Formaggio",
"Joseph A.",
""
]
] | The MiniBooNE detector at Fermilab is designed to search for $\nu_\mu \to \nu_e$ oscillation appearance at $E_\nu \sim 1 {\rm GeV}$ and to make a decisive test of the LSND signal. The main detector (inside a veto shield) is a spherical volume containing 0.680 ktons of mineral oil. This inner volume, viewed by 1280 phototubes, is primarily a \v{C}erenkov medium, as the scintillation yield is low. The entire detector is under a 3 m earth overburden. Though the detector is not optimized for low-energy (tens of MeV) events, and the cosmic-ray muon rate is high (10 kHz), we show that MiniBooNE can function as a useful supernova neutrino detector. Simple trigger-level cuts can greatly reduce the backgrounds due to cosmic-ray muons. For a canonical Galactic supernova at 10 kpc, about 190 supernova $\bar{\nu}_e + p \to e^+ + n$ events would be detected. By adding MiniBooNE to the international network of supernova detectors, the possibility of a supernova being missed would be reduced. Additionally, the paths of the supernova neutrinos through Earth will be different for MiniBooNE and other detectors, thus allowing tests of matter-affected mixing effects on the neutrino signal. |
2002.03981 | H\'ector Novales-S\'anchez | E. Mart\'inez-Pascual, G. N\'apoles-Ca\~nedo, H. Novales-S\'anchez, A.
Sierra-Mart\'inez, J. J. Toscano | Implications of extra dimensions on the effective charge and the beta
function in quantum electrodynamics | Accepted for publication in Physical Review D, 24 pages, 6 figures | Phys.Rev. D101 (2020) no.3, 035034 | 10.1103/PhysRevD.101.035034 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A comprehensive analysis on the photon self-energy, the fermion self-energy,
and the fermion vertex function is presented at one loop in the context of
quantum electrodynamics (QED) with 1 extra dimension. In 5-dimensional
theories, characterized by an infinite number of Kaluza-Klein fields, one-loop
amplitudes involve discrete as well as continuous sums, $\sum^\infty_{n=1}\int
d^4k$, that could diverge. Using dimensional regularization, we express such
sums as products of gamma and Epstein functions, both defined on the complex
plane, with divergences arising from poles of these functions in the limit as $
D \to 4$. Using the analytical properties of the Epstein function, we show that
the ultraviolet divergences generated by the Kaluza-Klein sums can be
consistently renormalized, which means that the corresponding renormalized
quantities reduce to the usual ones of QED at the limit of a very large
compactification scale $R^{-1}$. The main features of QED at the one-loop level
were studied. We use the mass-dependent $\mu$-scheme to calculate, in QED with
an arbitrary number $n$ of extra dimensions, a beta function fulfilling all
desirable physical requirements. We argue that in this type of theories, with a
large mass spectrum covering a wide energy range, beta functions should not be
calculated by using mass-independent renormalization schemes. We show that the
beta function is finite for any energy $\mu$. In particular, it reduces to the
usual QED result $e^3/12\pi^2$ for $m\ll \mu \ll R^{-1}$ and vanishes for $m\gg
\mu$, with $m$ the usual fermion mass. Throughout the work, the decoupling
nature of all our results obtained from the analytical properties of the
Epstein function is stressed.
| [
{
"created": "Mon, 10 Feb 2020 17:50:01 GMT",
"version": "v1"
}
] | 2020-02-26 | [
[
"Martínez-Pascual",
"E.",
""
],
[
"Nápoles-Cañedo",
"G.",
""
],
[
"Novales-Sánchez",
"H.",
""
],
[
"Sierra-Martínez",
"A.",
""
],
[
"Toscano",
"J. J.",
""
]
] | A comprehensive analysis on the photon self-energy, the fermion self-energy, and the fermion vertex function is presented at one loop in the context of quantum electrodynamics (QED) with 1 extra dimension. In 5-dimensional theories, characterized by an infinite number of Kaluza-Klein fields, one-loop amplitudes involve discrete as well as continuous sums, $\sum^\infty_{n=1}\int d^4k$, that could diverge. Using dimensional regularization, we express such sums as products of gamma and Epstein functions, both defined on the complex plane, with divergences arising from poles of these functions in the limit as $ D \to 4$. Using the analytical properties of the Epstein function, we show that the ultraviolet divergences generated by the Kaluza-Klein sums can be consistently renormalized, which means that the corresponding renormalized quantities reduce to the usual ones of QED at the limit of a very large compactification scale $R^{-1}$. The main features of QED at the one-loop level were studied. We use the mass-dependent $\mu$-scheme to calculate, in QED with an arbitrary number $n$ of extra dimensions, a beta function fulfilling all desirable physical requirements. We argue that in this type of theories, with a large mass spectrum covering a wide energy range, beta functions should not be calculated by using mass-independent renormalization schemes. We show that the beta function is finite for any energy $\mu$. In particular, it reduces to the usual QED result $e^3/12\pi^2$ for $m\ll \mu \ll R^{-1}$ and vanishes for $m\gg \mu$, with $m$ the usual fermion mass. Throughout the work, the decoupling nature of all our results obtained from the analytical properties of the Epstein function is stressed. |
hep-ph/9708217 | Suren Bagdasarov | K. Goulianos | Factorization and Scaling in Hard Diffraction | 6pp, LaTex file, uses psfig, 1 PS figure, presented at DIS97 | null | 10.1063/1.53630 | Rockefeller University RU 97/E-29 | hep-ph | null | We compare results on diffractive W-boson production at the Tevatron with
predictions based on the diffractive structure function measured in deep
inelastic scattering at HERA assuming (a) conventional factorization or (b)
hard factorization combined with a rapidity gap distribution scaled to the
total gap probability. We find that conventional factorization fails, while the
scaling prediction agrees with the data.
| [
{
"created": "Sat, 2 Aug 1997 00:01:56 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Goulianos",
"K.",
""
]
] | We compare results on diffractive W-boson production at the Tevatron with predictions based on the diffractive structure function measured in deep inelastic scattering at HERA assuming (a) conventional factorization or (b) hard factorization combined with a rapidity gap distribution scaled to the total gap probability. We find that conventional factorization fails, while the scaling prediction agrees with the data. |
hep-ph/0211027 | Oleg Teryaev | O.V. Teryaev | Spin-dependent, interference and $T-$odd fragmentation and fracture
functions | 6 Pages, Presented at DIS2002, Krak\'ow, 30.4.--4.5.2002 | Acta Phys.Polon. B33 (2002) 3749 | null | null | hep-ph | null | Fracture functions, originally suggested to describe the production of
diffractive and leading hadrons in semi-inclusive DIS, may be also applied at
fixed target energies. They may also include interference and final state
interaction, providing a source for azimuthal asymmetries at HERMES and
(especially) $\Lambda$ polarization at NOMAD. The recent papers by Brodsky,
Hwang and Schmidt, and by Gluck and Reya, may be understood in terms of
fracture functions.
| [
{
"created": "Sun, 3 Nov 2002 16:02:37 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Nov 2002 17:11:47 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Teryaev",
"O. V.",
""
]
] | Fracture functions, originally suggested to describe the production of diffractive and leading hadrons in semi-inclusive DIS, may be also applied at fixed target energies. They may also include interference and final state interaction, providing a source for azimuthal asymmetries at HERMES and (especially) $\Lambda$ polarization at NOMAD. The recent papers by Brodsky, Hwang and Schmidt, and by Gluck and Reya, may be understood in terms of fracture functions. |
0908.1149 | Vadim Guzey | V. Guzey (Jefferson Lab), M. Strikman (Penn State U.) | Color fluctuation approximation for multiple interactions in leading
twist theory of nuclear shadowing | 16 pages, 4 figures. Revised to address the Referee's comments.
Matches the published version, PLB 687 (2010) 167. | Phys.Lett.B687:167-173,2010 | 10.1016/j.physletb.2010.03.008 | JLAB-THY-09-1048 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The leading twist theory of nuclear shadowing predicts the shadowing
correction to nuclear parton distributions at small $x$ by connecting it to the
leading twist hard diffraction in electron-nucleon scattering. The
uncertainties of the predictions are related to the shadowing effects resulting
from the interaction of the hard probe with $N \ge 3$ nucleons. We argue that
the pattern of hard diffraction observed at HERA allows one to reduce these
uncertainties. We develop a new approach to the treatment of these multiple
interactions, which is based on the concept of the color fluctuations and
accounts for the presence of both point-like and hadron-like configurations in
the virtual photon wave function. Using the developed framework, we update our
predictions for the leading twist nuclear shadowing in nuclear parton
distributions of heavy nuclei at small $x$.
| [
{
"created": "Sat, 8 Aug 2009 05:18:17 GMT",
"version": "v1"
},
{
"created": "Wed, 31 Mar 2010 18:23:45 GMT",
"version": "v2"
}
] | 2015-03-13 | [
[
"Guzey",
"V.",
"",
"Jefferson Lab"
],
[
"Strikman",
"M.",
"",
"Penn State U."
]
] | The leading twist theory of nuclear shadowing predicts the shadowing correction to nuclear parton distributions at small $x$ by connecting it to the leading twist hard diffraction in electron-nucleon scattering. The uncertainties of the predictions are related to the shadowing effects resulting from the interaction of the hard probe with $N \ge 3$ nucleons. We argue that the pattern of hard diffraction observed at HERA allows one to reduce these uncertainties. We develop a new approach to the treatment of these multiple interactions, which is based on the concept of the color fluctuations and accounts for the presence of both point-like and hadron-like configurations in the virtual photon wave function. Using the developed framework, we update our predictions for the leading twist nuclear shadowing in nuclear parton distributions of heavy nuclei at small $x$. |
1006.5356 | Tillmann Heidsieck | Andrzej J. Buras, Bj\"orn Duling, Thorsten Feldmann, Tillmann
Heidsieck, Christoph Promberger | Lepton Flavour Violation in the Presence of a Fourth Generation of
Quarks and Leptons | 28 pages, 9 figures, v3: References added, Version to be published in
JHEP | JHEP 1009:104,2010 | 10.1007/JHEP09(2010)104 | TUM-HEP-764/10 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the rates for the charged lepton flavour violating (LFV) decays
l_i -> l_j gamma, tau -> l pi, tau -> l eta('), mu^- -> e^-e^+e^-, the six
three-body leptonic decays tau^- -> l_i^- l_j^+ l_k^- and the rate for mu-e
conversion in nuclei in the Standard Model (SM3) extended by a fourth
generation of quarks and leptons (SM4), assuming that neutrinos are Dirac
particles. We also calculate branching ratios for K_L -> mu e, K_L -> pi^0 mu
e, B_{d,s} -> mu e, B_{d,s} -> tau e and B_{d,s} -> tau mu. We find that the
pattern of the LFV branching ratios in the SM4 differs significantly from the
one encountered in the MSSM, allowing to distinguish these two models with the
help of LFV processes in a transparent manner. Also differences with respect to
the Littlest Higgs model with T-parity are found. Most importantly the
branching ratios for l_i -> l_j gamma, tau -> l pi, tau -> l eta('), mu^- ->
e^-e^+e^-, tau^- -> e^-e^+e^-, tau^- -> mu^- mu^+ mu^-, tau^- -> e^- mu^+ mu^-
and tau^- -> mu^- e^+ e^- can all still be as large as the present experimental
upper bounds but not necessarily simultaneously. Also the rate for mu-e
conversion in nuclei can reach the corresponding upper bound.
| [
{
"created": "Mon, 28 Jun 2010 14:07:05 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Jul 2010 11:39:20 GMT",
"version": "v2"
},
{
"created": "Mon, 16 Aug 2010 07:15:45 GMT",
"version": "v3"
}
] | 2014-11-21 | [
[
"Buras",
"Andrzej J.",
""
],
[
"Duling",
"Björn",
""
],
[
"Feldmann",
"Thorsten",
""
],
[
"Heidsieck",
"Tillmann",
""
],
[
"Promberger",
"Christoph",
""
]
] | We calculate the rates for the charged lepton flavour violating (LFV) decays l_i -> l_j gamma, tau -> l pi, tau -> l eta('), mu^- -> e^-e^+e^-, the six three-body leptonic decays tau^- -> l_i^- l_j^+ l_k^- and the rate for mu-e conversion in nuclei in the Standard Model (SM3) extended by a fourth generation of quarks and leptons (SM4), assuming that neutrinos are Dirac particles. We also calculate branching ratios for K_L -> mu e, K_L -> pi^0 mu e, B_{d,s} -> mu e, B_{d,s} -> tau e and B_{d,s} -> tau mu. We find that the pattern of the LFV branching ratios in the SM4 differs significantly from the one encountered in the MSSM, allowing to distinguish these two models with the help of LFV processes in a transparent manner. Also differences with respect to the Littlest Higgs model with T-parity are found. Most importantly the branching ratios for l_i -> l_j gamma, tau -> l pi, tau -> l eta('), mu^- -> e^-e^+e^-, tau^- -> e^-e^+e^-, tau^- -> mu^- mu^+ mu^-, tau^- -> e^- mu^+ mu^- and tau^- -> mu^- e^+ e^- can all still be as large as the present experimental upper bounds but not necessarily simultaneously. Also the rate for mu-e conversion in nuclei can reach the corresponding upper bound. |
hep-ph/9802356 | Andrija Rasin | Andrija Rasin | Hierarchical Quark Mass Matrices | LaTeX, 19 pages. References added, minor changes in text. Version
published in Phys. Rev. D | Phys.Rev.D58:096012,1998 | 10.1103/PhysRevD.58.096012 | null | hep-ph | null | I define a set of conditions that the most general hierarchical Yukawa mass
matrices have to satisfy so that the leading rotations in the diagonalization
matrix are a pair of (2,3) and (1,2) rotations. In addition to Fritzsch
structures, examples of such hierarchical structures include also matrices with
(1,3) elements of the same order or even much larger than the (1,2) elements.
Such matrices can be obtained in the framework of a flavor theory. To leading
order, the values of the angle in the (2,3) plane (s_{23}) and the angle in the
(1,2) plane (s_{12}) do not depend on the order in which they are taken when
diagonalizing. We find that any of the Cabbibo-Kobayashi-Maskawa matrix
parametrizations that consists of at least one (1,2) and one (2,3) rotation may
be suitable. In the particular case when the s_{13} diagonalization angles are
sufficiently small compared to the product s_{12}s_{23}, two special CKM
parametrizations emerge: the R_{12}R_{23}R_{12} parametrization follows with
s_{23} taken before the s_{12} rotation, and vice versa for the
R_{23}R_{12}R_{23} parametrization.
| [
{
"created": "Wed, 18 Feb 1998 23:00:15 GMT",
"version": "v1"
},
{
"created": "Fri, 9 Oct 1998 14:53:28 GMT",
"version": "v2"
}
] | 2010-11-23 | [
[
"Rasin",
"Andrija",
""
]
] | I define a set of conditions that the most general hierarchical Yukawa mass matrices have to satisfy so that the leading rotations in the diagonalization matrix are a pair of (2,3) and (1,2) rotations. In addition to Fritzsch structures, examples of such hierarchical structures include also matrices with (1,3) elements of the same order or even much larger than the (1,2) elements. Such matrices can be obtained in the framework of a flavor theory. To leading order, the values of the angle in the (2,3) plane (s_{23}) and the angle in the (1,2) plane (s_{12}) do not depend on the order in which they are taken when diagonalizing. We find that any of the Cabbibo-Kobayashi-Maskawa matrix parametrizations that consists of at least one (1,2) and one (2,3) rotation may be suitable. In the particular case when the s_{13} diagonalization angles are sufficiently small compared to the product s_{12}s_{23}, two special CKM parametrizations emerge: the R_{12}R_{23}R_{12} parametrization follows with s_{23} taken before the s_{12} rotation, and vice versa for the R_{23}R_{12}R_{23} parametrization. |
hep-ph/9611215 | Agaev Shahin Sabir | Shahin S. Agaev | Resummation of infrared renormalons in the pion electromagnetic form
factor calculations | 9 pp., 2 fig | null | null | ICTP preprint IC/95/291 | hep-ph | null | The pion electromagnetic form factor F_{\pi}(Q^{2}) is calculated at the
leading order of pQCD using the running coupling constant
(\alpha_{S}(Q^{2}(1-x)(1-y))) approach. The resummed expression for
F_{\pi}(Q^{2}) is found. It is shown that the effect of the infrared
renormalons can be taken into account by scale-setting procedure
$\alpha_{S}(Q^{2}) \rightarrow \alpha_{S}(e^{f(Q^{2})}Q^{2})$ in the leading
order expression
| [
{
"created": "Sat, 2 Nov 1996 16:20:52 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Nov 1996 14:59:44 GMT",
"version": "v2"
}
] | 2008-02-03 | [
[
"Agaev",
"Shahin S.",
""
]
] | The pion electromagnetic form factor F_{\pi}(Q^{2}) is calculated at the leading order of pQCD using the running coupling constant (\alpha_{S}(Q^{2}(1-x)(1-y))) approach. The resummed expression for F_{\pi}(Q^{2}) is found. It is shown that the effect of the infrared renormalons can be taken into account by scale-setting procedure $\alpha_{S}(Q^{2}) \rightarrow \alpha_{S}(e^{f(Q^{2})}Q^{2})$ in the leading order expression |
1901.02295 | Jihn E. Kim | Junu Jeong, Jihn E. Kim, Soonkeon Nam | Leptonic CP violation in flipped SU(5) GUT from $Z_{12-I}$ Orbifold
Compactification | 12 pages, 5 figures | Physics Letters B791 (2019) 215 | 10.1016/j.physletb.2019.02.035 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We obtain a phenomenologically acceptable PMNS matrix in a flipped SU(5)
model inspired by the compactification of heterotic string $E_8\times E_8'$. To
analyze the Jarlskog determinant efficiently, we include the simple Kim-Seo
form for the Pontecorbo-Maki-Nakagawa-Sakata matrix. We also noted that
$|\delta_{\rm PMNS}|\lesssim 64^{\rm o}$ for the normal hierarchy of neutrino
masses with the PDG book parametrization.
| [
{
"created": "Tue, 8 Jan 2019 13:25:39 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Jan 2019 22:55:38 GMT",
"version": "v2"
}
] | 2019-03-06 | [
[
"Jeong",
"Junu",
""
],
[
"Kim",
"Jihn E.",
""
],
[
"Nam",
"Soonkeon",
""
]
] | We obtain a phenomenologically acceptable PMNS matrix in a flipped SU(5) model inspired by the compactification of heterotic string $E_8\times E_8'$. To analyze the Jarlskog determinant efficiently, we include the simple Kim-Seo form for the Pontecorbo-Maki-Nakagawa-Sakata matrix. We also noted that $|\delta_{\rm PMNS}|\lesssim 64^{\rm o}$ for the normal hierarchy of neutrino masses with the PDG book parametrization. |
hep-ph/9307351 | Jean Cleymans | N. Bilic, J.Cleymans, K. Redlich and E. Suhonen | Transition from a quark-gluon plasma in the presence of a sharp front | 10 pages, manuscript in TeX, 9 figures available as Postscript files,
CERN-TH 6923/93 | Z.Phys.C63:525-530,1994 | 10.1007/BF01580333 | null | hep-ph | null | The effect of a sharp front separating the quark-gluon plasma phase from the
hadronic phase is investigated. Energy-momentum conservation and baryon number
conservation constrain the possible temperature jump across the front. If one
assumes that the temperature in the hadronic phase is $T\simeq$ 200 MeV , as
has been suggested by numerous results from relativistic ion collisions, one
can determine the corresponding temperature in the quark phase with the help of
continuity equations across the front. The calculations reveal that the quark
phase must be in a strongly supercooled state. The stability of this solution
with respect to minor modifications is investigated. In particular the effect
of an admixture of hadronic matter in the quark phase (e.g. in the form of
bubbles) is considered in detail. In the absence of admixture the transition
proceeds via a detonation transition and is accompanied by a substantial
super-cooling of the quark-gluon plasma phase. The detonation is accompanied by
less supercooling if a small fraction of bubbles is allowed. By increasing the
fraction of bubbles the supercooling becomes weaker and eventually the
transition proceeds via a smoother deflagration wave.
| [
{
"created": "Wed, 28 Jul 1993 12:40:51 GMT",
"version": "v1"
}
] | 2010-11-01 | [
[
"Bilic",
"N.",
""
],
[
"Cleymans",
"J.",
""
],
[
"Redlich",
"K.",
""
],
[
"Suhonen",
"E.",
""
]
] | The effect of a sharp front separating the quark-gluon plasma phase from the hadronic phase is investigated. Energy-momentum conservation and baryon number conservation constrain the possible temperature jump across the front. If one assumes that the temperature in the hadronic phase is $T\simeq$ 200 MeV , as has been suggested by numerous results from relativistic ion collisions, one can determine the corresponding temperature in the quark phase with the help of continuity equations across the front. The calculations reveal that the quark phase must be in a strongly supercooled state. The stability of this solution with respect to minor modifications is investigated. In particular the effect of an admixture of hadronic matter in the quark phase (e.g. in the form of bubbles) is considered in detail. In the absence of admixture the transition proceeds via a detonation transition and is accompanied by a substantial super-cooling of the quark-gluon plasma phase. The detonation is accompanied by less supercooling if a small fraction of bubbles is allowed. By increasing the fraction of bubbles the supercooling becomes weaker and eventually the transition proceeds via a smoother deflagration wave. |
hep-ph/9508286 | null | R. Ragazzon and D. Treleani | Multiparton interactions and production of minijets in high energy
hadronic collisions | TeX file, 20 pages, 4 figures available on request | Phys.Rev. D53 (1996) 55-62 | 10.1103/PhysRevD.53.55 | UTS-DFT-95-06 | hep-ph | null | We discuss the inclusive cross section to produce two minijets with a large
separation in rapidity in high energy hadronic collisions. The contribution to
the inclusive cross section from the exchange of a BFKL Pomeron is compared
with the contribution from the exchange of two BFKL Pomerons, which is induced
by the unitarization of the semi-hard interaction. The effect of the multiple
exchange is studied both as a function of the azimuthal correlation and as a
function of the transverse momentum of the observed minijets.
| [
{
"created": "Fri, 11 Aug 1995 12:41:44 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Ragazzon",
"R.",
""
],
[
"Treleani",
"D.",
""
]
] | We discuss the inclusive cross section to produce two minijets with a large separation in rapidity in high energy hadronic collisions. The contribution to the inclusive cross section from the exchange of a BFKL Pomeron is compared with the contribution from the exchange of two BFKL Pomerons, which is induced by the unitarization of the semi-hard interaction. The effect of the multiple exchange is studied both as a function of the azimuthal correlation and as a function of the transverse momentum of the observed minijets. |
1504.00517 | Ashutosh Alok | Ashutosh Kumar Alok, Subhashish Banerjee, Dinesh Kumar, S. Uma Sankar,
David London | New-physics signals of a model with a vector-singlet up-type quark | 30 pages, no figures. arXiv admin note: text overlap with
arXiv:1402.1023 | Phys. Rev. D 92, 013002 (2015) | 10.1103/PhysRevD.92.013002 | UdeM-GPP-TH-15-241 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The VuQ model involves the addition of a vector isosinglet up-type quark to
the standard model. In this model the full CKM quark mixing matrix is 4 X 3.
Using present flavor-physics data, we perform a fit to this full CKM matrix,
looking for signals of new physics (NP). We find that the VuQ model is very
strongly constrained. There are no hints of NP in the CKM matrix, and any VuQ
contributions to loop-level flavor-changing b -> s, b -> d and s -> d
transitions are very small. There can be significant enhancements of the
branching ratios of the flavor-changing decays t -> u Z and t -> c Z, but these
are still below present detection levels.
| [
{
"created": "Thu, 2 Apr 2015 11:49:19 GMT",
"version": "v1"
}
] | 2016-03-10 | [
[
"Alok",
"Ashutosh Kumar",
""
],
[
"Banerjee",
"Subhashish",
""
],
[
"Kumar",
"Dinesh",
""
],
[
"Sankar",
"S. Uma",
""
],
[
"London",
"David",
""
]
] | The VuQ model involves the addition of a vector isosinglet up-type quark to the standard model. In this model the full CKM quark mixing matrix is 4 X 3. Using present flavor-physics data, we perform a fit to this full CKM matrix, looking for signals of new physics (NP). We find that the VuQ model is very strongly constrained. There are no hints of NP in the CKM matrix, and any VuQ contributions to loop-level flavor-changing b -> s, b -> d and s -> d transitions are very small. There can be significant enhancements of the branching ratios of the flavor-changing decays t -> u Z and t -> c Z, but these are still below present detection levels. |
hep-ph/0012319 | Gennaro Corcella | Gennaro Corcella (Rochester U.), Elinor K. Irish (Rochester U.),
Michael H. Seymour (RAL) | HERWIG for Top Physics at the Linear Collider | 5 pages, 3 figures. Talk given at Linear Collider Workshop 2000,
Fermi National Accelerator Laboratory, Batavia, IL, U.S.A., 24-28 October
2000 | null | 10.1063/1.1394341 | UR-1626 ER/40685/963 | hep-ph | null | We discuss recent improvement in the treatment of gluon radiation in top
production and decay in e+e- processes according to the HERWIG event generator
and show studies on the top mass reconstruction at the future Linear Collider.
| [
{
"created": "Fri, 22 Dec 2000 23:06:08 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Corcella",
"Gennaro",
"",
"Rochester U."
],
[
"Irish",
"Elinor K.",
"",
"Rochester U."
],
[
"Seymour",
"Michael H.",
"",
"RAL"
]
] | We discuss recent improvement in the treatment of gluon radiation in top production and decay in e+e- processes according to the HERWIG event generator and show studies on the top mass reconstruction at the future Linear Collider. |
1710.11010 | William Javier Torres Bobadilla Dr. | Jose Llanes Jurado, German Rodrigo and William J. Torres Bobadilla | From Jacobi off-shell currents to integral relations | 22 pages, 3 figures | null | null | IFIC/17-17 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we study off-shell currents built from the Jacobi identity of
the kinematic numerators of $gg\to X$ with $X=ss,q\bar{q},gg$. We find that
these currents can be schematically written in terms of three-point interaction
Feynman rules. This representation allows for a straightforward understanding
of the Colour-Kinematics duality as well as for the construction of the
building blocks for the generation of higher-multiplicity tree-level and
multi-loop numerators. We also provide one-loop integral relations through the
Loop-Tree duality formalism with potential applications and advantages for the
computation of relevant physical processes at the Large Hadron Collider. We
illustrate these integral relations with the explicit examples of QCD one-loop
numerators of $gg\to ss$.
| [
{
"created": "Mon, 30 Oct 2017 15:27:39 GMT",
"version": "v1"
}
] | 2017-10-31 | [
[
"Jurado",
"Jose Llanes",
""
],
[
"Rodrigo",
"German",
""
],
[
"Bobadilla",
"William J. Torres",
""
]
] | In this paper, we study off-shell currents built from the Jacobi identity of the kinematic numerators of $gg\to X$ with $X=ss,q\bar{q},gg$. We find that these currents can be schematically written in terms of three-point interaction Feynman rules. This representation allows for a straightforward understanding of the Colour-Kinematics duality as well as for the construction of the building blocks for the generation of higher-multiplicity tree-level and multi-loop numerators. We also provide one-loop integral relations through the Loop-Tree duality formalism with potential applications and advantages for the computation of relevant physical processes at the Large Hadron Collider. We illustrate these integral relations with the explicit examples of QCD one-loop numerators of $gg\to ss$. |
1305.0021 | Lian-Tao Wang | Jing-Yuan Chen, Edward W. Kolb, Lian-Tao Wang | Dark matter coupling to electroweak gauge and Higgs bosons: an effective
field theory approach | null | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | If dark matter is a new species of particle produced in the early universe as
a cold thermal relic (a weakly-interacting massive particle-WIMP), its present
abundance, its scattering with matter in direct-detection experiments, its
present-day annihilation signature in indirect-detection experiments, and its
production and detection at colliders, depend crucially on the WIMP coupling to
standard-model (SM) particles. It is usually assumed that the WIMP couples to
the SM sector through its interactions with quarks and leptons. In this paper
we explore the possibility that the WIMP coupling to the SM sector is via
electroweak gauge and Higgs bosons. In the absence of an ultraviolet-complete
particle-physics model, we employ effective field theory to describe the
WIMP--SM coupling. We consider both scalars and Dirac fermions as possible
dark-matter candidates. Starting with an exhaustive list of operators up to
dimension 8, we present detailed calculation of dark-matter annihilations to
all possible final states, including gamma gamma, gamma Z, gamma h, ZZ, Zh, W+
W-, hh, and f fbar, and demonstrate the correlations among them. We compute the
mass scale of the effective field theory necessary to obtain the correct
dark-matter mass density, and well as the resulting photon line signals.
| [
{
"created": "Tue, 30 Apr 2013 20:31:11 GMT",
"version": "v1"
}
] | 2013-05-02 | [
[
"Chen",
"Jing-Yuan",
""
],
[
"Kolb",
"Edward W.",
""
],
[
"Wang",
"Lian-Tao",
""
]
] | If dark matter is a new species of particle produced in the early universe as a cold thermal relic (a weakly-interacting massive particle-WIMP), its present abundance, its scattering with matter in direct-detection experiments, its present-day annihilation signature in indirect-detection experiments, and its production and detection at colliders, depend crucially on the WIMP coupling to standard-model (SM) particles. It is usually assumed that the WIMP couples to the SM sector through its interactions with quarks and leptons. In this paper we explore the possibility that the WIMP coupling to the SM sector is via electroweak gauge and Higgs bosons. In the absence of an ultraviolet-complete particle-physics model, we employ effective field theory to describe the WIMP--SM coupling. We consider both scalars and Dirac fermions as possible dark-matter candidates. Starting with an exhaustive list of operators up to dimension 8, we present detailed calculation of dark-matter annihilations to all possible final states, including gamma gamma, gamma Z, gamma h, ZZ, Zh, W+ W-, hh, and f fbar, and demonstrate the correlations among them. We compute the mass scale of the effective field theory necessary to obtain the correct dark-matter mass density, and well as the resulting photon line signals. |
2102.11145 | Tuomas Tenkanen | Philipp M. Schicho, Tuomas V. I. Tenkanen and Juuso \"Osterman | Robust approach to thermal resummation: Standard Model meets a singlet | 86 pages, 2 figures and 141 Feynman diagrams | null | 10.1007/JHEP06(2021)130 | null | hep-ph astro-ph.CO gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Perturbation theory alone fails to describe thermodynamics of the electroweak
phase transition. We review a technique combining perturbative and
non-perturbative methods to overcome this challenge. Accordingly, the principal
theme is a tutorial of high-temperature dimensional reduction. We present an
explicit derivation with a real singlet scalar and compute the thermal
effective potential at two-loop order. In particular, we detail the dimensional
reduction for a real-singlet extended Standard Model. The resulting effective
theory will impact future non-perturbative studies based on lattice simulations
as well as purely perturbative investigations.
| [
{
"created": "Mon, 22 Feb 2021 16:15:59 GMT",
"version": "v1"
}
] | 2021-07-07 | [
[
"Schicho",
"Philipp M.",
""
],
[
"Tenkanen",
"Tuomas V. I.",
""
],
[
"Österman",
"Juuso",
""
]
] | Perturbation theory alone fails to describe thermodynamics of the electroweak phase transition. We review a technique combining perturbative and non-perturbative methods to overcome this challenge. Accordingly, the principal theme is a tutorial of high-temperature dimensional reduction. We present an explicit derivation with a real singlet scalar and compute the thermal effective potential at two-loop order. In particular, we detail the dimensional reduction for a real-singlet extended Standard Model. The resulting effective theory will impact future non-perturbative studies based on lattice simulations as well as purely perturbative investigations. |
2010.14581 | Maxim Khlopov | Maxim Yu. Khlopov | Multi-messenger cosmology of new physics | Plenary talk at ICPPA2020 conference | null | 10.1088/1742-6596/1690/1/012182 | null | hep-ph astro-ph.CO gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The observational evidence for the inflationary cosmology with baryosynthesis
and dark matter/energy can be viewed as the messenger for new physics, which
governed the Universe origin, evolution and structure. To specify the physics
beyond the Standard model (BSM), underlying the modern cosmological paradigm
additional model dependent messengers are proposed, involving multi-component
and composite dark matter, meta-stable particles, primordial black holes and
antimatter domains in baryon asymmetrical Universe.
| [
{
"created": "Tue, 27 Oct 2020 19:44:34 GMT",
"version": "v1"
}
] | 2021-02-03 | [
[
"Khlopov",
"Maxim Yu.",
""
]
] | The observational evidence for the inflationary cosmology with baryosynthesis and dark matter/energy can be viewed as the messenger for new physics, which governed the Universe origin, evolution and structure. To specify the physics beyond the Standard model (BSM), underlying the modern cosmological paradigm additional model dependent messengers are proposed, involving multi-component and composite dark matter, meta-stable particles, primordial black holes and antimatter domains in baryon asymmetrical Universe. |
1012.4750 | Pratishruti Saha | Debajyoti Choudhury, Rohini M. Godbole, Saurabh D. Rindani,
Pratishruti Saha | Top polarization, forward-backward asymmetry and new physics | Version published in Physical Review D | Phys.Rev.D84:014023,2011 | 10.1103/PhysRevD.84.014023 | CERN-PH-TH/2010-314 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider how the measurement of top polarization at the Tevatron can be
used to characterise and discriminate among different new physics models that
have been suggested to explain the anomalous top forward-backward asymmetry
reported at the Tevatron. This has the advantage of catching the essence of the
parity violating effect characteristic to the different suggested new physics
models. Other observables constructed from these asymmetries are shown to be
useful in discriminating between the models, even after taking into account the
statistical errors. Finally, we discuss some signals at the 7 TeV LHC.
| [
{
"created": "Tue, 21 Dec 2010 18:05:25 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Jan 2011 16:14:47 GMT",
"version": "v2"
},
{
"created": "Wed, 20 Jul 2011 04:34:56 GMT",
"version": "v3"
}
] | 2015-03-17 | [
[
"Choudhury",
"Debajyoti",
""
],
[
"Godbole",
"Rohini M.",
""
],
[
"Rindani",
"Saurabh D.",
""
],
[
"Saha",
"Pratishruti",
""
]
] | We consider how the measurement of top polarization at the Tevatron can be used to characterise and discriminate among different new physics models that have been suggested to explain the anomalous top forward-backward asymmetry reported at the Tevatron. This has the advantage of catching the essence of the parity violating effect characteristic to the different suggested new physics models. Other observables constructed from these asymmetries are shown to be useful in discriminating between the models, even after taking into account the statistical errors. Finally, we discuss some signals at the 7 TeV LHC. |
hep-ph/9405284 | Felix Schlumpf | Felix Schlumpf | The Form Factors of the Nucleons | 10 pages ReVTeX, 5 figures included, SLAC-PUB-6502 | AIPConf.Proc.334:583-586,1995 | null | null | hep-ph | null | We demonstrate that a relativistic constituent quark model can give nucleon
form factors that agree well with recent, accurate measurements. The
relativistic features of the model and the specific form of the wave function
are essential for the result. (Talk given at 14th International Conference on
Few-Body Problems in Physics, Williamsburg, Virginia, USA, May 26-31, 1994)
| [
{
"created": "Fri, 13 May 1994 17:11:56 GMT",
"version": "v1"
}
] | 2009-09-25 | [
[
"Schlumpf",
"Felix",
""
]
] | We demonstrate that a relativistic constituent quark model can give nucleon form factors that agree well with recent, accurate measurements. The relativistic features of the model and the specific form of the wave function are essential for the result. (Talk given at 14th International Conference on Few-Body Problems in Physics, Williamsburg, Virginia, USA, May 26-31, 1994) |
1611.01859 | Chris Korthals Altes | Chris P. Korthals Altes | Raymond and instantons: some recollections and the use of ADHM | 20 pages, two figures | null | 10.1016/j.nuclphysb.2016.07.021 | null | hep-ph physics.hist-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | After the discovery of the BRST identities in 1974 Raymond spent some two
years mostly on instantons. In those years we had a small group at the Centre
Physique Th\'eorique in Marseille discussing the physics and mathematics of
instantons.
The upshot of our discussions can be found in a set of lectures given by
Raymond in Erice in 1977 and a year later in a Physics Reports volume. I
present some recollections of that period; mostly how we were influenced by the
twistor approach. I discuss the Atiyah-Drinfeld-Hitchin-Manin (ADHM) method to
obtain instantons ("calorons") in thermal QCD following earlier work. The
building blocks are a prepotential and a gauge invariant propagator.
Then I will give surprisingly simple results in terms of these building
blocks for the one loop vacuum response to a change in caloron parameters and
some physical consequences for the effective action, in particular screening
properties.
| [
{
"created": "Sun, 6 Nov 2016 23:05:21 GMT",
"version": "v1"
}
] | 2016-12-21 | [
[
"Altes",
"Chris P. Korthals",
""
]
] | After the discovery of the BRST identities in 1974 Raymond spent some two years mostly on instantons. In those years we had a small group at the Centre Physique Th\'eorique in Marseille discussing the physics and mathematics of instantons. The upshot of our discussions can be found in a set of lectures given by Raymond in Erice in 1977 and a year later in a Physics Reports volume. I present some recollections of that period; mostly how we were influenced by the twistor approach. I discuss the Atiyah-Drinfeld-Hitchin-Manin (ADHM) method to obtain instantons ("calorons") in thermal QCD following earlier work. The building blocks are a prepotential and a gauge invariant propagator. Then I will give surprisingly simple results in terms of these building blocks for the one loop vacuum response to a change in caloron parameters and some physical consequences for the effective action, in particular screening properties. |
1712.07611 | C\'edric Weiland | K. Moffat, S. Pascoli and C. Weiland | Equivalence between massless neutrinos and lepton number conservation in
fermionic singlet extensions of the Standard Model | 22+1 pages, 2 plots in 1 figure | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the most general necessary and sufficient condition for three
massless light neutrinos in variants of the type I seesaw mechanism in which we
introduce an arbitrary number of fermionic gauge singlets. We find that having
massless light neutrinos is equivalent to enforcing the conservation of lepton
number. As a consequence, any symmetry that leads to massless light neutrinos
will contain as an unbroken subgroup a conserved lepton number. This will be
important for searches for heavy sterile neutrinos since in general the light
neutrino masses will be proportional to small lepton number violating
parameters that will also suppress lepton number violating signatures.
| [
{
"created": "Wed, 20 Dec 2017 17:57:32 GMT",
"version": "v1"
}
] | 2017-12-21 | [
[
"Moffat",
"K.",
""
],
[
"Pascoli",
"S.",
""
],
[
"Weiland",
"C.",
""
]
] | We discuss the most general necessary and sufficient condition for three massless light neutrinos in variants of the type I seesaw mechanism in which we introduce an arbitrary number of fermionic gauge singlets. We find that having massless light neutrinos is equivalent to enforcing the conservation of lepton number. As a consequence, any symmetry that leads to massless light neutrinos will contain as an unbroken subgroup a conserved lepton number. This will be important for searches for heavy sterile neutrinos since in general the light neutrino masses will be proportional to small lepton number violating parameters that will also suppress lepton number violating signatures. |
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