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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
hep-ph/0212409 | Vladimir Makarenko | T.V. Shishkina, V.V. Makarenko | The investigation of spin effects in photon production with fermion pair
in gamma-gamma collisions | 7 pages, 7 figures, corrected typos, minor changes | null | null | null | hep-ph | null | The exclusive reaction $ \gamma\gamma\to f \bar{f} \gamma$ is considered as
the possible calibration process on the linear photon collider. We analyse the
energy spectrum and total cross section dependence on the detector parameters
at various initial beam helicities.
| [
{
"created": "Tue, 31 Dec 2002 15:16:01 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Mar 2003 16:04:34 GMT",
"version": "v2"
},
{
"created": "Mon, 12 May 2003 14:55:53 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Shishkina",
"T. V.",
""
],
[
"Makarenko",
"V. V.",
""
]
] | The exclusive reaction $ \gamma\gamma\to f \bar{f} \gamma$ is considered as the possible calibration process on the linear photon collider. We analyse the energy spectrum and total cross section dependence on the detector parameters at various initial beam helicities. |
hep-ph/9612361 | A. Djouadi | Abdelhak Djouadi (LPM Montpellier, ITP Karlsruhe) | Higgs Phenomenology: a short review | 16 pages in Latex, no figure | Acta Phys.Polon.B27:3837-3853,1996 | null | PM/96--34, KA-TP-27-1996 | hep-ph | null | I briefly review the Higgs sector in the Standard Model and in its minimal
supersymmetric extension. After summarizing the properties of the Higgs bosons,
I will discuss the prospects for discovering these particles at the present
colliders LEP2 and Tevatron, and at the next generation colliders LHC and a
high--energy $e^+e^-$ linear collider. The possibilities of studying the
properties of the Higgs bosons will be then summarized. [Short write-up of
lectures given at the XXXVI Cracow School of Theoretical Physics, June 1996.]
| [
{
"created": "Sat, 14 Dec 1996 20:45:22 GMT",
"version": "v1"
}
] | 2011-04-15 | [
[
"Djouadi",
"Abdelhak",
"",
"LPM Montpellier, ITP Karlsruhe"
]
] | I briefly review the Higgs sector in the Standard Model and in its minimal supersymmetric extension. After summarizing the properties of the Higgs bosons, I will discuss the prospects for discovering these particles at the present colliders LEP2 and Tevatron, and at the next generation colliders LHC and a high--energy $e^+e^-$ linear collider. The possibilities of studying the properties of the Higgs bosons will be then summarized. [Short write-up of lectures given at the XXXVI Cracow School of Theoretical Physics, June 1996.] |
1109.2357 | Jure Drobnak | Jure Drobnak, Svjetlana Fajfer and Jernej F. Kamenik | Probing anomalous tWb interactions with rare B decays | 14 pages | null | 10.1016/j.nuclphysb.2011.10.004 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Precision studies of top quark properties are currently underway at the LHC
and Tevatron colliders with the prospect of probing anomalous t-W -b
interactions. In the mean time, recent experimental results for the B_{d,s} -
\bar{B}_{d,s} oscillation observables, the branching ratio B_s->\mu^+\mu^-, as
well as the forward - backward asymmetry in B->K\starl^+l^-, accompanied by the
accurate theoretical predictions for the relevant observables obtained within
the SM motivate a combined study of these observables in the presence of
anomalous t - W - b vertices. We investigate contributions of such anomalous
couplings to the B->X_s l^+l^- decay mode, and combining them with the
modifications of the B_{d,s} - \bar{B}_d,s, B->X_s{\gamma} observables, we
determine indirect bounds on the real and imaginary parts of the anomalous t -
W - b interactions. We find these to be mostly superior to present direct
constraints coming from top decay and production measurements at the LHC and
Tevatron. Finally, we predict the allowed effects in the branching ratios of
the B_s->\mu^+\mu^- and B->K^{(*)}\nu \bar{\nu}, as well as the
forward-backward asymmetry in B->K^*l^+l^-. We find that improved knowledge of
these observables in the future could further constrain some of the anomalous
tWb interactions.
| [
{
"created": "Sun, 11 Sep 2011 22:14:33 GMT",
"version": "v1"
}
] | 2015-05-30 | [
[
"Drobnak",
"Jure",
""
],
[
"Fajfer",
"Svjetlana",
""
],
[
"Kamenik",
"Jernej F.",
""
]
] | Precision studies of top quark properties are currently underway at the LHC and Tevatron colliders with the prospect of probing anomalous t-W -b interactions. In the mean time, recent experimental results for the B_{d,s} - \bar{B}_{d,s} oscillation observables, the branching ratio B_s->\mu^+\mu^-, as well as the forward - backward asymmetry in B->K\starl^+l^-, accompanied by the accurate theoretical predictions for the relevant observables obtained within the SM motivate a combined study of these observables in the presence of anomalous t - W - b vertices. We investigate contributions of such anomalous couplings to the B->X_s l^+l^- decay mode, and combining them with the modifications of the B_{d,s} - \bar{B}_d,s, B->X_s{\gamma} observables, we determine indirect bounds on the real and imaginary parts of the anomalous t - W - b interactions. We find these to be mostly superior to present direct constraints coming from top decay and production measurements at the LHC and Tevatron. Finally, we predict the allowed effects in the branching ratios of the B_s->\mu^+\mu^- and B->K^{(*)}\nu \bar{\nu}, as well as the forward-backward asymmetry in B->K^*l^+l^-. We find that improved knowledge of these observables in the future could further constrain some of the anomalous tWb interactions. |
1009.1836 | Tetsuo Shindou | Shinya Kanemura, Tetsuo Shindou, Kei Yagyu | Non-decoupling effects in supersymmetric Higgs sectors | 16pages, 6figures. To be published in Physics Letters B | Phys.Lett.B699:258-263,2011 | 10.1016/j.physletb.2011.04.001 | UT-HET 042, KU-PH-007 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A wide class of Higgs sectors is investigated in supersymmetric standard
models. When the lightest Higgs boson (h) looks the standard model one, the
mass (m_h) and the triple Higgs boson coupling (the hhh coupling) are evaluated
at the one-loop level in each model. While m_h is at most 120-130 GeV in the
minimal supersymmetric standard model (MSSM), that in models with an additional
neutral singlet or triplet fields can be much larger. The hhh coupling can also
be sensitive to the models: while in the MSSM the deviation from the standard
model prediction is not significant, that can be 30-60 % in some models such as
the MSSM with the additional singlet or with extra doublets and charged
singlets. These models are motivated by specific physics problems like the
mu-problem, the neutrino mass, the scalar dark matter and so on. Therefore,
when h is found at the CERN Large Hadron Collider, we can classify
supersymmetric models by measuring m_h and the hhh coupling accurately at
future collider experiments.
| [
{
"created": "Thu, 9 Sep 2010 17:39:31 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Dec 2010 02:13:47 GMT",
"version": "v2"
},
{
"created": "Wed, 20 Apr 2011 01:26:09 GMT",
"version": "v3"
}
] | 2011-06-16 | [
[
"Kanemura",
"Shinya",
""
],
[
"Shindou",
"Tetsuo",
""
],
[
"Yagyu",
"Kei",
""
]
] | A wide class of Higgs sectors is investigated in supersymmetric standard models. When the lightest Higgs boson (h) looks the standard model one, the mass (m_h) and the triple Higgs boson coupling (the hhh coupling) are evaluated at the one-loop level in each model. While m_h is at most 120-130 GeV in the minimal supersymmetric standard model (MSSM), that in models with an additional neutral singlet or triplet fields can be much larger. The hhh coupling can also be sensitive to the models: while in the MSSM the deviation from the standard model prediction is not significant, that can be 30-60 % in some models such as the MSSM with the additional singlet or with extra doublets and charged singlets. These models are motivated by specific physics problems like the mu-problem, the neutrino mass, the scalar dark matter and so on. Therefore, when h is found at the CERN Large Hadron Collider, we can classify supersymmetric models by measuring m_h and the hhh coupling accurately at future collider experiments. |
hep-ph/9712358 | null | S.I. Bityukov (IHEP, Protvino), N.V. Krasnikov (INR, Moscow) | The search for sleptons and flavour lepton number violation at LHC (CMS) | 2 latex files (27 pages, 6 pages), 1 eps file (figure) | Phys.Atom.Nucl. 62 (1999) 1213-1225; Yad.Fiz. 62 (1999) 1288-1300 | null | IHEP 97-67 | hep-ph | null | We study a possibility to detect sleptons and flavour lepton number violation
at LHC (CMS). We investigate the production and decays of right- and
left-handed sleptons separately. We have found that for L = 10**5 1/pb it would
be possible to discover right-handed sleptons with a mass up to 350 GeV and
left-handed ones with a mass up to 350 GeV. We also investigate a possibility
to look for flavour lepton number violation in slepton decays due to the mixing
of different generations sleptons. We find that for the maximal (smu_R - se_R)
mixing it is possible to detect such effect for sleptons with a mass up to 250
GeV.
| [
{
"created": "Fri, 12 Dec 1997 03:02:06 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Jan 1998 16:29:19 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Bityukov",
"S. I.",
"",
"IHEP, Protvino"
],
[
"Krasnikov",
"N. V.",
"",
"INR, Moscow"
]
] | We study a possibility to detect sleptons and flavour lepton number violation at LHC (CMS). We investigate the production and decays of right- and left-handed sleptons separately. We have found that for L = 10**5 1/pb it would be possible to discover right-handed sleptons with a mass up to 350 GeV and left-handed ones with a mass up to 350 GeV. We also investigate a possibility to look for flavour lepton number violation in slepton decays due to the mixing of different generations sleptons. We find that for the maximal (smu_R - se_R) mixing it is possible to detect such effect for sleptons with a mass up to 250 GeV. |
hep-ph/0504007 | Stefan Antusch | Stefan Antusch, Steve F. King, Rabindra N. Mohapatra | Quark-Lepton Complementarity in Unified Theories | 18 pages; minor correction in the appendix and a reference added;
version published in Phys. Lett. B | Phys.Lett. B618 (2005) 150-161 | 10.1016/j.physletb.2005.05.026 | SHEP/0510, UMD-PP-05-042 | hep-ph | null | As pointed out by many authors, recent observations are consistent with an
intriguing relation between the Cabibbo angle $\theta_C$ and the solar neutrino
mixing angle $\theta_{12}$, namely $\theta_{12} \simeq \pi/4 - \theta_C$. Such
quark-lepton complementarity (QLC) may be a signal of an underlying
quark-lepton unification at short distances. We discuss possible ways to
realize this relation in realistic quark-lepton unification theories by
identifying a minimal set of operators that lead to QLC while remaining
consistent with other known data. The purpose of this paper is to present the
first elements of a unified model at the GUT scale capable of predicting the
QLC relation. A generic prediction of our proposed class of models is the new
relation for the lepton mixing angle $\theta_{13} \simeq \theta_C$, which
allows these models to be confirmed or excluded by the current generation of
neutrino oscillation experiments.
| [
{
"created": "Fri, 1 Apr 2005 16:38:55 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Jul 2005 08:22:12 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Antusch",
"Stefan",
""
],
[
"King",
"Steve F.",
""
],
[
"Mohapatra",
"Rabindra N.",
""
]
] | As pointed out by many authors, recent observations are consistent with an intriguing relation between the Cabibbo angle $\theta_C$ and the solar neutrino mixing angle $\theta_{12}$, namely $\theta_{12} \simeq \pi/4 - \theta_C$. Such quark-lepton complementarity (QLC) may be a signal of an underlying quark-lepton unification at short distances. We discuss possible ways to realize this relation in realistic quark-lepton unification theories by identifying a minimal set of operators that lead to QLC while remaining consistent with other known data. The purpose of this paper is to present the first elements of a unified model at the GUT scale capable of predicting the QLC relation. A generic prediction of our proposed class of models is the new relation for the lepton mixing angle $\theta_{13} \simeq \theta_C$, which allows these models to be confirmed or excluded by the current generation of neutrino oscillation experiments. |
hep-ph/0006098 | Cvetic Gorazd | G. Cvetic and R. Koegerler | Scale- and scheme-independent extension of Pade approximants; Bjorken
polarized sum rule as an example | 39 pages, 5 eps-figures, revtex; one reference added; version to
appear in Phys. Rev. D (issue of March 1, 2001) | Phys.Rev. D63 (2001) 056013 | 10.1103/PhysRevD.63.056013 | null | hep-ph | null | A renormalization-scale-invariant generalization of the diagonal Pad\'e
approximants (dPA), developed previously, is extended so that it becomes
renormalization-scheme-invariant as well. We do this explicitly when two terms
beyond the leading order (NNLO, $\sim \alpha_s^3$) are known in the truncated
perturbation series (TPS). At first, the scheme dependence shows up as a
dependence on the first two scheme parameters $c_2$ and $c_3$. Invariance under
the change of the leading parameter $c_2$ is achieved via a variant of the
principle of minimal sensitivity. The subleading parameter $c_3$ is fixed so
that a scale- and scheme-invariant Borel transform of the resummation
approximant gives the correct location of the leading infrared renormalon pole.
The leading higher-twist contribution, or a part of it, is thus believed to be
contained implicitly in the resummation. We applied the approximant to the
Bjorken polarized sum rule (BjPSR) at $Q^2_{\rm ph}=5$ and $3 GeV^2$, for the
most recent data and the data available until 1997, respectively, and obtained
${\alpha}_s^{\bar MS}(M_Z^2)=0.119^{+0.003}_{-0.006}$ and
$0.113^{+0.004}_{-0.019}$, respectively. Very similar results are obtained with
the Grunberg's effective charge method and Stevenson's TPS principle of minimal
sensitivity, if we fix $c_3$-parameter in them by the aforementioned procedure.
The central values for ${\alpha}_s^{\bar MS}(M_Z^2)$ increase to 0.120 (0.114)
when applying dPA's, and 0.125 (0.118) when applying NNLO TPS.
| [
{
"created": "Sat, 10 Jun 2000 04:54:20 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Nov 2000 18:34:58 GMT",
"version": "v2"
},
{
"created": "Thu, 25 Jan 2001 21:25:16 GMT",
"version": "v3"
}
] | 2009-10-31 | [
[
"Cvetic",
"G.",
""
],
[
"Koegerler",
"R.",
""
]
] | A renormalization-scale-invariant generalization of the diagonal Pad\'e approximants (dPA), developed previously, is extended so that it becomes renormalization-scheme-invariant as well. We do this explicitly when two terms beyond the leading order (NNLO, $\sim \alpha_s^3$) are known in the truncated perturbation series (TPS). At first, the scheme dependence shows up as a dependence on the first two scheme parameters $c_2$ and $c_3$. Invariance under the change of the leading parameter $c_2$ is achieved via a variant of the principle of minimal sensitivity. The subleading parameter $c_3$ is fixed so that a scale- and scheme-invariant Borel transform of the resummation approximant gives the correct location of the leading infrared renormalon pole. The leading higher-twist contribution, or a part of it, is thus believed to be contained implicitly in the resummation. We applied the approximant to the Bjorken polarized sum rule (BjPSR) at $Q^2_{\rm ph}=5$ and $3 GeV^2$, for the most recent data and the data available until 1997, respectively, and obtained ${\alpha}_s^{\bar MS}(M_Z^2)=0.119^{+0.003}_{-0.006}$ and $0.113^{+0.004}_{-0.019}$, respectively. Very similar results are obtained with the Grunberg's effective charge method and Stevenson's TPS principle of minimal sensitivity, if we fix $c_3$-parameter in them by the aforementioned procedure. The central values for ${\alpha}_s^{\bar MS}(M_Z^2)$ increase to 0.120 (0.114) when applying dPA's, and 0.125 (0.118) when applying NNLO TPS. |
1208.0428 | Zhi Hui Guo | Zhi-Hui Guo, J. A. Oller and J. Ruiz de Elvira | Recent developments in U(3) ChPT: meson-meson scattering and finite
energy sum rules | 6 pages, 1 figure. Talk given at Sixth International Conference on
Quarks and Nuclear Physics (QNP2012), April 16-20, 2012 Ecole Polytechnique,
Palaiseau, Paris, France | PoS (QNP2012) 066 | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the meson-meson scattering and finite energy sum rule(FESR), based
on the one-loop calculation within U(3) chiral perturbation theory. First we
obtain the pertinent resonance spectroscopy from the unitarized partial wave
scattering amplitudes. Then we investigate how well the FESR can be satisfied
in the physical situation at Nc=3. Further discussions on the extrapolation of
Nc are also given.
| [
{
"created": "Thu, 2 Aug 2012 08:18:46 GMT",
"version": "v1"
}
] | 2012-08-03 | [
[
"Guo",
"Zhi-Hui",
""
],
[
"Oller",
"J. A.",
""
],
[
"de Elvira",
"J. Ruiz",
""
]
] | We discuss the meson-meson scattering and finite energy sum rule(FESR), based on the one-loop calculation within U(3) chiral perturbation theory. First we obtain the pertinent resonance spectroscopy from the unitarized partial wave scattering amplitudes. Then we investigate how well the FESR can be satisfied in the physical situation at Nc=3. Further discussions on the extrapolation of Nc are also given. |
hep-ph/9702435 | Timo van Ritbergen | S.A. Larin, T. van Ritbergen, J.A.M. Vermaseren | The (alpha_s)^3 approximation of Quantum Chromodynamics to the
Ellis-Jaffe sum rule | 11 pages, Latex | Phys.Lett. B404 (1997) 153-160 | 10.1016/S0370-2693(97)00534-0 | UM-TH-97-02, NIKHEF-97-011 | hep-ph | null | We present the analytical calculation in perturbative Quantum Chromodynamics
of the (alpha_s)^3 contribution to the Ellis-Jaffe sum rule for the structure
function g1 of polarized deep inelastic lepton-nucleon scattering.
| [
{
"created": "Thu, 27 Feb 1997 16:42:56 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Larin",
"S. A.",
""
],
[
"van Ritbergen",
"T.",
""
],
[
"Vermaseren",
"J. A. M.",
""
]
] | We present the analytical calculation in perturbative Quantum Chromodynamics of the (alpha_s)^3 contribution to the Ellis-Jaffe sum rule for the structure function g1 of polarized deep inelastic lepton-nucleon scattering. |
2302.04188 | Giovanni Pelliccioli | Ansgar Denner, Mathieu Pellen, Giovanni Pelliccioli | NLO QCD corrections to off-shell top-antitop production with
semi-leptonic decays at lepton colliders | 15 pages, 9 figures | null | 10.1140/epjc/s10052-023-11500-3 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The study of top-quark properties will be a central aspect of the physics
programme of any future lepton collider. In this article, we investigate the
production of top-quark pairs in the semi-leptonic decay channel in $\rm
e^+e^-$ collisions, whose experimental signature is one charged lepton, jets,
and missing energy. We present for the first time fiducial cross sections and
differential distributions at next-to-leading-order accuracy in QCD for the
full off-shell process. We find that the QCD corrections for the considered
process are strongly dependent on the beam energies and range from few per cent
up to more than $100\%$ (near threshold and above 1 TeV). We focus, in
particular, on two scenarios: one close to threshold (365 GeV), dominated by
top-pair production, and one at the TeV scale (1.5 TeV), for which
irreducible-background contributions become relevant. An assessment of
polarised-beam effects is also provided.
| [
{
"created": "Wed, 8 Feb 2023 16:56:59 GMT",
"version": "v1"
}
] | 2023-05-24 | [
[
"Denner",
"Ansgar",
""
],
[
"Pellen",
"Mathieu",
""
],
[
"Pelliccioli",
"Giovanni",
""
]
] | The study of top-quark properties will be a central aspect of the physics programme of any future lepton collider. In this article, we investigate the production of top-quark pairs in the semi-leptonic decay channel in $\rm e^+e^-$ collisions, whose experimental signature is one charged lepton, jets, and missing energy. We present for the first time fiducial cross sections and differential distributions at next-to-leading-order accuracy in QCD for the full off-shell process. We find that the QCD corrections for the considered process are strongly dependent on the beam energies and range from few per cent up to more than $100\%$ (near threshold and above 1 TeV). We focus, in particular, on two scenarios: one close to threshold (365 GeV), dominated by top-pair production, and one at the TeV scale (1.5 TeV), for which irreducible-background contributions become relevant. An assessment of polarised-beam effects is also provided. |
hep-ph/9512360 | Jesus | B. de Carlos (Oxford), J.A. Casas and J.M. Moreno (Madrid) | Natural flavour mixing in the MSSM and $\mu --> e, \gamma$ | 6 pages, latex+sprocl.sty, 2 figures uuencoded. Based on a talk given
by J.M. Moreno at the International Workshop on Elementary Particle Physics:
Present and Future, Valencia (Spain) 5-9 June 1995 | null | null | IEM-FT-118/95 | hep-ph | null | In the absence of any additional assumption it is natural to conjecture that
sizeable flavour-mixing mass entries, $\Delta m^2$, may appear in the mass
matrices of the scalars of the MSSM, i.e. $\Delta m^2\sim O(m^2)$. This flavour
violation can still be reconciled with the experiment if the gaugino mass,
$M_{1/2}$, is large enough to yield (through the renormalization group running)
a sufficiently small $\Delta m^2 / m^2$ at low energy. This leads to a gaugino
dominance framework (i.e. $M_{1/2}^2\gg m^2$), which permits a remarkably
model--independent analysis. We study this possibility focussing our attention
on the $\mu\rightarrow e,\gamma$ decay. In this way we obtain very strong and
general constraints, in particular $\frac{M_{1/2}^2}{\Delta m} \simgt 34\ {\rm
TeV}$.
| [
{
"created": "Tue, 19 Dec 1995 19:03:25 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"de Carlos",
"B.",
"",
"Oxford"
],
[
"Casas",
"J. A.",
"",
"Madrid"
],
[
"Moreno",
"J. M.",
"",
"Madrid"
]
] | In the absence of any additional assumption it is natural to conjecture that sizeable flavour-mixing mass entries, $\Delta m^2$, may appear in the mass matrices of the scalars of the MSSM, i.e. $\Delta m^2\sim O(m^2)$. This flavour violation can still be reconciled with the experiment if the gaugino mass, $M_{1/2}$, is large enough to yield (through the renormalization group running) a sufficiently small $\Delta m^2 / m^2$ at low energy. This leads to a gaugino dominance framework (i.e. $M_{1/2}^2\gg m^2$), which permits a remarkably model--independent analysis. We study this possibility focussing our attention on the $\mu\rightarrow e,\gamma$ decay. In this way we obtain very strong and general constraints, in particular $\frac{M_{1/2}^2}{\Delta m} \simgt 34\ {\rm TeV}$. |
1805.09292 | Bogumi{\l}a \'Swie\.zewska | Leonardo Chataignier, Tomislav Prokopec, Michael G. Schmidt, Bogumila
Swiezewska | Systematic analysis of radiative symmetry breaking in models with
extended scalar sector | 31 pages, 8 figures; v2: comparison with the Gildener-Weinberg method
extended with an analysis of the mixing angle, references added, minor
modifications, v3: missing plot legends added, v4: minor changes, matches
published version | JHEP 08 (2018) 083 | 10.1007/JHEP08(2018)083 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Radiative symmetry breaking (RSB) is a theoretically appealing framework for
the generation of mass scales through quantum effects. It can be successfully
implemented in models with extended scalar and gauge sectors. We provide a
systematic analysis of RSB in such models: we review the common approximative
methods of studying RSB, emphasising their limits of applicability and discuss
the relevance of the relative magnitudes of tree-level and loop contributions
as well as the dependence of the results on the renormalisation scale. The
general considerations are exemplified within the context of the conformal
Standard Model extended with a scalar doublet of a new SU(2)$_X$ gauge group,
the so-called SU(2)cSM. We show that various perturbative methods of studying
RSB may yield significantly different results due to renormalisation-scale
dependence. Implementing the renormalisation-group (RG) improvement method
recently developed in arXiv:1801.05258, which is well-suited for multi-scale
models, we argue that the use of the RG improved effective potential can
alleviate this scale dependence providing more reliable results.
| [
{
"created": "Wed, 23 May 2018 17:24:36 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Jun 2018 12:34:16 GMT",
"version": "v2"
},
{
"created": "Fri, 22 Jun 2018 06:54:20 GMT",
"version": "v3"
},
{
"created": "Wed, 22 Aug 2018 07:46:40 GMT",
"version": "v4"
}
] | 2018-08-23 | [
[
"Chataignier",
"Leonardo",
""
],
[
"Prokopec",
"Tomislav",
""
],
[
"Schmidt",
"Michael G.",
""
],
[
"Swiezewska",
"Bogumila",
""
]
] | Radiative symmetry breaking (RSB) is a theoretically appealing framework for the generation of mass scales through quantum effects. It can be successfully implemented in models with extended scalar and gauge sectors. We provide a systematic analysis of RSB in such models: we review the common approximative methods of studying RSB, emphasising their limits of applicability and discuss the relevance of the relative magnitudes of tree-level and loop contributions as well as the dependence of the results on the renormalisation scale. The general considerations are exemplified within the context of the conformal Standard Model extended with a scalar doublet of a new SU(2)$_X$ gauge group, the so-called SU(2)cSM. We show that various perturbative methods of studying RSB may yield significantly different results due to renormalisation-scale dependence. Implementing the renormalisation-group (RG) improvement method recently developed in arXiv:1801.05258, which is well-suited for multi-scale models, we argue that the use of the RG improved effective potential can alleviate this scale dependence providing more reliable results. |
2304.02475 | Dibya Chattopadhyay | Dibya S. Chattopadhyay, Amol Dighe | Quantum mismatch: a powerful measure of "quantumness" in neutrino
oscillations | 6 pages, 4 figures | null | null | TIFR/TH/23-2 | hep-ph hep-ex quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The quantum nature of neutrino oscillations would be reflected in the
mismatch between the neutrino survival probabilities with and without an
intermediate observation. We propose this ``quantum mismatch'' as a measure of
quantumness in neutrino oscillations, which precisely extracts the interference
term in the two-flavor limit. In the full three-flavor scenario, we provide
modified definitions of the Leggett-Garg and quantum mismatch measures. These
are applicable for long-baseline and reactor neutrino experiments that measure
neutrino survival probabilities with negligible matter effects.
| [
{
"created": "Wed, 5 Apr 2023 14:50:36 GMT",
"version": "v1"
}
] | 2023-04-06 | [
[
"Chattopadhyay",
"Dibya S.",
""
],
[
"Dighe",
"Amol",
""
]
] | The quantum nature of neutrino oscillations would be reflected in the mismatch between the neutrino survival probabilities with and without an intermediate observation. We propose this ``quantum mismatch'' as a measure of quantumness in neutrino oscillations, which precisely extracts the interference term in the two-flavor limit. In the full three-flavor scenario, we provide modified definitions of the Leggett-Garg and quantum mismatch measures. These are applicable for long-baseline and reactor neutrino experiments that measure neutrino survival probabilities with negligible matter effects. |
hep-ph/9808446 | Sheldon Lee Glashow, Hpop | Sidney Coleman and Sheldon L. Glashow | Evading the GZK Cosmic-Ray Cutoff | 6 pages, harvmac | null | null | null | hep-ph | null | Explanations of the origin of ultra-high energy cosmic rays are severely
constrained by the Greisen-Zatsepin-Kuz'min effect, which limits their
propagation over cosmological distances. We argue that possible departures from
strict Lorentz invariance, too small to have been detected otherwise, can
affect elementary-particle kinematics so as to suppress or forbid inelastic
collisions of cosmic-ray nucleons with background photons. Thereby can the GZK
cutoff be relaxed or removed.
| [
{
"created": "Thu, 27 Aug 1998 22:04:08 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Coleman",
"Sidney",
""
],
[
"Glashow",
"Sheldon L.",
""
]
] | Explanations of the origin of ultra-high energy cosmic rays are severely constrained by the Greisen-Zatsepin-Kuz'min effect, which limits their propagation over cosmological distances. We argue that possible departures from strict Lorentz invariance, too small to have been detected otherwise, can affect elementary-particle kinematics so as to suppress or forbid inelastic collisions of cosmic-ray nucleons with background photons. Thereby can the GZK cutoff be relaxed or removed. |
2101.04119 | Samuel Homiller | Daniel Egana-Ugrinovic, Samuel Homiller, Patrick Meade | Multi-Higgs Production Probes Higgs Flavor | 32 pages, 11 figures | Phys. Rev. D 103, 115005 (2021) | 10.1103/PhysRevD.103.115005 | YITP-SB-21-1 | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | We demonstrate that multiple-Higgs production at the LHC is the most
sensitive probe of first and second-generation quark flavor in the Higgs
sector. In models where new scalars couple to light quarks, gigantic di-Higgs
and even sizable tri-Higgs production rates can be obtained, which can be used
to either discover or severely constrain such theories. As an example, we show
that the most stringent bounds on enhanced interactions of the
$125\,\textrm{GeV}$ Higgs to the down quark in extended Higgs sectors are
obtained by looking for the extra Higgs bosons that provide for such
enhancements using the di-Higgs and $Zh$ topologies. In this context, we set
new limits on the 125 GeV Higgs coupling to the down quark as strong as
$\lambda_{hd\bar{d}} \lesssim 30 \lambda_{hd\bar{d}}^{\textrm{SM}}$ -- a
dramatic improvement over previously available bounds. Regarding
second-generation quark flavor, we obtain new limits in the coupling to strange
as strong as $\lambda_{hs\bar{s}} \lesssim 10
\lambda_{hs\bar{s}}^{\textrm{SM}}$. In addition, we show that the currently
unexplored triple-Higgs production topology could be a potential discovery
channel of a wide variety of extended Higgs sectors at the LHC, including not
only models where extra Higgses couple to light quarks, but also popular
theories where they have preferential couplings to the the top.
| [
{
"created": "Mon, 11 Jan 2021 19:00:01 GMT",
"version": "v1"
}
] | 2021-06-16 | [
[
"Egana-Ugrinovic",
"Daniel",
""
],
[
"Homiller",
"Samuel",
""
],
[
"Meade",
"Patrick",
""
]
] | We demonstrate that multiple-Higgs production at the LHC is the most sensitive probe of first and second-generation quark flavor in the Higgs sector. In models where new scalars couple to light quarks, gigantic di-Higgs and even sizable tri-Higgs production rates can be obtained, which can be used to either discover or severely constrain such theories. As an example, we show that the most stringent bounds on enhanced interactions of the $125\,\textrm{GeV}$ Higgs to the down quark in extended Higgs sectors are obtained by looking for the extra Higgs bosons that provide for such enhancements using the di-Higgs and $Zh$ topologies. In this context, we set new limits on the 125 GeV Higgs coupling to the down quark as strong as $\lambda_{hd\bar{d}} \lesssim 30 \lambda_{hd\bar{d}}^{\textrm{SM}}$ -- a dramatic improvement over previously available bounds. Regarding second-generation quark flavor, we obtain new limits in the coupling to strange as strong as $\lambda_{hs\bar{s}} \lesssim 10 \lambda_{hs\bar{s}}^{\textrm{SM}}$. In addition, we show that the currently unexplored triple-Higgs production topology could be a potential discovery channel of a wide variety of extended Higgs sectors at the LHC, including not only models where extra Higgses couple to light quarks, but also popular theories where they have preferential couplings to the the top. |
hep-ph/0102299 | Mingqiu Huang | Ming-qiu Huang (CCAST & CIT) and Yuan-ben Dai (ITP,CAS) | Subleading Isgur-Wise form factors and O(1/m_Q) corrections to the
semileptonic decays B->D_1 l\bar\nu and B->D_2^* l\bar\nu | RevTeX, 18 pages including 3 PS figures. Errors are estimated, some
misprints are corrected and minor wording modification in revision | Phys.Rev. D64 (2001) 014034 | 10.1103/PhysRevD.64.014034 | null | hep-ph | null | Exclusive semileptonic decays B->D_1(2420)l\bar\nu and B->D_2^*(2460)l\bar\nu
are studied at the subleading order of the heavy quark expansion. The
subleading Isgur-Wise functions resulted from the kinetic energy and
chromomagnetic corrections to the HQET Lagrangian are calculated by QCD sum
rules in the framework of the heavy quark effective theory. The decay rates and
branching ratios are computed with the inclusion of the order of 1/m_Q
corrections. It is found that the 1/m_Q correction to the decay rate is not
large for B->D^*_2 but is very large for B->D_1.
| [
{
"created": "Sat, 24 Feb 2001 01:58:35 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Apr 2001 17:55:08 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Huang",
"Ming-qiu",
"",
"CCAST & CIT"
],
[
"Dai",
"Yuan-ben",
"",
"ITP,CAS"
]
] | Exclusive semileptonic decays B->D_1(2420)l\bar\nu and B->D_2^*(2460)l\bar\nu are studied at the subleading order of the heavy quark expansion. The subleading Isgur-Wise functions resulted from the kinetic energy and chromomagnetic corrections to the HQET Lagrangian are calculated by QCD sum rules in the framework of the heavy quark effective theory. The decay rates and branching ratios are computed with the inclusion of the order of 1/m_Q corrections. It is found that the 1/m_Q correction to the decay rate is not large for B->D^*_2 but is very large for B->D_1. |
1711.05757 | Lucian Harland-Lang | L. A. Harland-Lang, A. D. Martin, R. S. Thorne | The Impact of LHC Jet Data on the MMHT PDF Fit at NNLO | 21 pages, 15 figures, 4 tables. Version accepted for publication in
EPJC | null | 10.1140/epjc/s10052-018-5710-7 | IPPP/17/85 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the impact of the high precision ATLAS and CMS 7 TeV
measurements of inclusive jet production on the MMHT global PDF analysis at
next-to-next-to-leading order (NNLO). This is made possible by the recent
completion of the long-term project to calculate the NNLO corrections to the
hard cross section. We find that a good description of the ATLAS data is not
possible with the default treatment of experimental systematic errors, and
develop a simplified solution that retains the dominant physical information of
the data. We then investigate the fit quality and the impact on the gluon PDF
central value and uncertainty when the ATLAS and CMS data are included in a
MMHT fit. We consider both common choices for the factorization and
renormalization scale, namely the inclusive jet transverse momentum, $p_\perp$,
and the leading jet $p_\perp$, as well as the different jet radii for which the
ATLAS and CMS data are made available. We find that the impact of these data on
the gluon is relatively insensitive to these inputs, in particular the scale
choice, while the inclusion of NNLO corrections tends to improve the data
description somewhat, and gives a qualitatively similar though not identical
impact on the gluon in comparison to NLO.
| [
{
"created": "Wed, 15 Nov 2017 19:16:00 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Mar 2018 13:40:09 GMT",
"version": "v2"
}
] | 2018-04-18 | [
[
"Harland-Lang",
"L. A.",
""
],
[
"Martin",
"A. D.",
""
],
[
"Thorne",
"R. S.",
""
]
] | We investigate the impact of the high precision ATLAS and CMS 7 TeV measurements of inclusive jet production on the MMHT global PDF analysis at next-to-next-to-leading order (NNLO). This is made possible by the recent completion of the long-term project to calculate the NNLO corrections to the hard cross section. We find that a good description of the ATLAS data is not possible with the default treatment of experimental systematic errors, and develop a simplified solution that retains the dominant physical information of the data. We then investigate the fit quality and the impact on the gluon PDF central value and uncertainty when the ATLAS and CMS data are included in a MMHT fit. We consider both common choices for the factorization and renormalization scale, namely the inclusive jet transverse momentum, $p_\perp$, and the leading jet $p_\perp$, as well as the different jet radii for which the ATLAS and CMS data are made available. We find that the impact of these data on the gluon is relatively insensitive to these inputs, in particular the scale choice, while the inclusion of NNLO corrections tends to improve the data description somewhat, and gives a qualitatively similar though not identical impact on the gluon in comparison to NLO. |
2305.11711 | Igor Kachaev A | Igor Kachaev, IHEP | Modified S-wave $\pi\pi$ scattering amplitude for multiparticle PWA | 7 pages, 2 figures | null | null | IHEP preprint 2022-8 | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Suggested by Au, Morgan, Pennington (AMP) S-wave isospin I=0 $\pi\pi$, $KK$
scattering amplitude is good enough to describe experimental data for the
moment. Still it has two disadvantages for use in multiparticle partial wave
analysis (PWA), namely sharp drop at the $KK$ threshold and unreasonable
behavior at $M(\pi\pi) > 1.6\,GeV/c^2$. The drop is not seen in multiparticle
systems.
We suggest the modified AMP amplitude, mAMP, for the only aim, namely to
describe the broad part of $S$-wave $\pi\pi\,\to\,\pi\pi$ scattering in the
wide $M(\pi\pi)$ range in multiparticle PWA. The mAMP amplitude describes
threshold behavior of the $\pi\pi\,\to\,\pi\pi$ scattering and the wide
structure at $M\sim 1400\,MeV/c^2$ reasonably well. It is assumed that narrow
objects $f_0(980)$, $f_0(1500)$ are included in PWA separately. The amplitude
does not describe $\pi\pi\to KK$ scattering. The mAMP amplitude is purely
phenomenological.
| [
{
"created": "Fri, 19 May 2023 14:45:34 GMT",
"version": "v1"
}
] | 2023-05-22 | [
[
"Kachaev",
"Igor",
""
],
[
"IHEP",
"",
""
]
] | Suggested by Au, Morgan, Pennington (AMP) S-wave isospin I=0 $\pi\pi$, $KK$ scattering amplitude is good enough to describe experimental data for the moment. Still it has two disadvantages for use in multiparticle partial wave analysis (PWA), namely sharp drop at the $KK$ threshold and unreasonable behavior at $M(\pi\pi) > 1.6\,GeV/c^2$. The drop is not seen in multiparticle systems. We suggest the modified AMP amplitude, mAMP, for the only aim, namely to describe the broad part of $S$-wave $\pi\pi\,\to\,\pi\pi$ scattering in the wide $M(\pi\pi)$ range in multiparticle PWA. The mAMP amplitude describes threshold behavior of the $\pi\pi\,\to\,\pi\pi$ scattering and the wide structure at $M\sim 1400\,MeV/c^2$ reasonably well. It is assumed that narrow objects $f_0(980)$, $f_0(1500)$ are included in PWA separately. The amplitude does not describe $\pi\pi\to KK$ scattering. The mAMP amplitude is purely phenomenological. |
1109.5835 | Takaaki Nomura | Cheng-Wei Chiang, Takaaki Nomura, Joe Sato | Gauge-Higgs unification models in six dimensions with $S^2/Z_2$ extra
space and GUT gauge symmetry | 40 pages, review article | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article, we review gauge-Higgs unification models based on gauge
theories defined on six-dimensional spacetime with $S^2/Z_2$ topology in the
extra spatial dimensions. On the extra $S^2/Z_2$ space, non-trivial boundary
conditions are imposed. This review considers two scenarios for constructing a
four-dimensional theory from the six-dimensional model. One scheme utilizes the
SO(12) gauge symmetry with a special symmetry condition imposed on the gauge
field, whereas the other employs the E$_6$ gauge symmetry without requiring the
additional symmetry condition. Both models lead to a Standard Model-like gauge
theory with the SU(3) $\times$ SU(2)$_L$ $\times$ U(1)$_Y$($\times$ U(1)$^2$)
symmetry and SM fermions in four dimensions. The Higgs sector of the model is
also analyzed. The electroweak symmetry breaking can be realized, and the weak
gauge boson and Higgs boson masses are obtained.
| [
{
"created": "Tue, 27 Sep 2011 11:09:38 GMT",
"version": "v1"
}
] | 2011-09-28 | [
[
"Chiang",
"Cheng-Wei",
""
],
[
"Nomura",
"Takaaki",
""
],
[
"Sato",
"Joe",
""
]
] | In this article, we review gauge-Higgs unification models based on gauge theories defined on six-dimensional spacetime with $S^2/Z_2$ topology in the extra spatial dimensions. On the extra $S^2/Z_2$ space, non-trivial boundary conditions are imposed. This review considers two scenarios for constructing a four-dimensional theory from the six-dimensional model. One scheme utilizes the SO(12) gauge symmetry with a special symmetry condition imposed on the gauge field, whereas the other employs the E$_6$ gauge symmetry without requiring the additional symmetry condition. Both models lead to a Standard Model-like gauge theory with the SU(3) $\times$ SU(2)$_L$ $\times$ U(1)$_Y$($\times$ U(1)$^2$) symmetry and SM fermions in four dimensions. The Higgs sector of the model is also analyzed. The electroweak symmetry breaking can be realized, and the weak gauge boson and Higgs boson masses are obtained. |
hep-ph/0301130 | Anton Rebhan | Anton Rebhan | HTL-resummed thermodynamics of hot and dense QCD: An update | 10 pages, 6 figures. To appear in the proceedings of Strong and
Electroweak Matter (SEWM 2002), Heidelberg, Germany, 2-5 Oct 2002. v2: 1 typo
and 2 references updated | null | 10.1142/9789812704498_0015 | TUW-03-02 | hep-ph hep-lat | null | We review the proposal to resum the physics of hard thermal loops in the
thermodynamics of the quark-gluon plasma through nonperturbative expressions
for entropy and density obtained from a Phi-derivable two-loop approximation. A
comparison with the recently solved large-N_f limit of hot QCD is performed,
and some updates, in particular on quark number susceptibilities, are made.
| [
{
"created": "Fri, 17 Jan 2003 11:17:06 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Apr 2003 12:57:06 GMT",
"version": "v2"
}
] | 2017-08-23 | [
[
"Rebhan",
"Anton",
""
]
] | We review the proposal to resum the physics of hard thermal loops in the thermodynamics of the quark-gluon plasma through nonperturbative expressions for entropy and density obtained from a Phi-derivable two-loop approximation. A comparison with the recently solved large-N_f limit of hot QCD is performed, and some updates, in particular on quark number susceptibilities, are made. |
hep-ph/0312101 | Seungwon Baek | Seungwon Baek | CP violation in B --> phi K_S decay at large tan(beta) | 6 pages, 2 figures, talk presented at 2nd International Conference on
Flavor Physics | J.Korean Phys.Soc. 45 (2004) S435-S437 | null | null | hep-ph | null | We consider the chargino contribution to the CP violation in B \to \phi K_S
decay in the minimal supersymmetric standard model at large \tan\beta. It is
shown that the Wilson coefficient C_{8g} of the chromomagnetic penguin operator
can be significantly enhanced by the chargino-mediated diagrams while
satisfying other direct/indirect experimental constraints. The enhanced C_{8g}
allows large deviation in the CP asymmetry from the standard model prediction.
| [
{
"created": "Mon, 8 Dec 2003 03:34:43 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Baek",
"Seungwon",
""
]
] | We consider the chargino contribution to the CP violation in B \to \phi K_S decay in the minimal supersymmetric standard model at large \tan\beta. It is shown that the Wilson coefficient C_{8g} of the chromomagnetic penguin operator can be significantly enhanced by the chargino-mediated diagrams while satisfying other direct/indirect experimental constraints. The enhanced C_{8g} allows large deviation in the CP asymmetry from the standard model prediction. |
hep-ph/9904439 | Vyacheslav V. Gubin | N.N.Achasov, V.V.Gubin | The theoretical predictions for the study of the $a_0(980)$ and
$f_0(980)$ mesons in the $\phi$ radiative decays | Talk presented by V.V. Gubin at International workshop $e^+e^-$
collisions from $\phi$ to $J/\psi$, Budker Institute of Nuclear Physics,
Novosibirsk, Russia, March 1-5, 1999. LaTex, 5 pages, 2 figures | null | null | null | hep-ph hep-ex | null | The potentialities of the production of the $a_0(980)$ and $f_0(980)$ mesons
in the $\phi$ radiative decays are considered.
| [
{
"created": "Fri, 23 Apr 1999 09:46:24 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Achasov",
"N. N.",
""
],
[
"Gubin",
"V. V.",
""
]
] | The potentialities of the production of the $a_0(980)$ and $f_0(980)$ mesons in the $\phi$ radiative decays are considered. |
1303.6632 | Miguel Pato | Alejandro Ibarra, Hyun Min Lee, Sergio L\'opez Gehler, Wan-Il Park,
Miguel Pato | Gamma-ray boxes from axion-mediated dark matter | 16 pages, 5 figures. Error in Section 3 corrected, figures updated,
conclusions unchanged | JCAP05(2013)016 | 10.1088/1475-7516/2013/05/016 | null | hep-ph astro-ph.HE hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute the gamma-ray output of axion-mediated dark matter and derive the
corresponding constraints set by recent data. In such scenarios the dark matter
candidate is a Dirac fermion that pair-annihilates into axions and/or scalars.
Provided that the axion decays (at least partly) into photons, these models
naturally give rise to a box-shaped gamma-ray spectrum that may present two
distinct phenomenological behaviours: a narrow box, resembling a line at half
the dark matter mass, or a wide box, spanning an extensive energy range up to
the dark matter mass. Remarkably, we find that in both cases a sizable
gamma-ray flux is predicted for a thermal relic without fine-tuning the model
parameters nor invoking boost factors. This large output is in line with recent
Fermi-LAT observations towards the Galactic centre region and is on the verge
of being excluded. We then make use of the Fermi-LAT and H.E.S.S. data to
derive robust, model-independent upper limits on the dark matter annihilation
cross section for the narrow and wide box scenarios. H.E.S.S. constraints, in
particular, turn out to match the ones from Fermi-LAT at hundreds of GeV and
extend to multi-TeV masses. Future Cherenkov telescopes will likely probe
gamma-ray boxes from thermal dark matter relics in the whole multi-TeV range, a
region hardly accessible to direct detection, collider searches and other
indirect detection strategies.
| [
{
"created": "Tue, 26 Mar 2013 20:00:01 GMT",
"version": "v1"
},
{
"created": "Wed, 15 May 2013 14:52:10 GMT",
"version": "v2"
},
{
"created": "Fri, 8 Apr 2016 09:35:47 GMT",
"version": "v3"
}
] | 2016-04-11 | [
[
"Ibarra",
"Alejandro",
""
],
[
"Lee",
"Hyun Min",
""
],
[
"Gehler",
"Sergio López",
""
],
[
"Park",
"Wan-Il",
""
],
[
"Pato",
"Miguel",
""
]
] | We compute the gamma-ray output of axion-mediated dark matter and derive the corresponding constraints set by recent data. In such scenarios the dark matter candidate is a Dirac fermion that pair-annihilates into axions and/or scalars. Provided that the axion decays (at least partly) into photons, these models naturally give rise to a box-shaped gamma-ray spectrum that may present two distinct phenomenological behaviours: a narrow box, resembling a line at half the dark matter mass, or a wide box, spanning an extensive energy range up to the dark matter mass. Remarkably, we find that in both cases a sizable gamma-ray flux is predicted for a thermal relic without fine-tuning the model parameters nor invoking boost factors. This large output is in line with recent Fermi-LAT observations towards the Galactic centre region and is on the verge of being excluded. We then make use of the Fermi-LAT and H.E.S.S. data to derive robust, model-independent upper limits on the dark matter annihilation cross section for the narrow and wide box scenarios. H.E.S.S. constraints, in particular, turn out to match the ones from Fermi-LAT at hundreds of GeV and extend to multi-TeV masses. Future Cherenkov telescopes will likely probe gamma-ray boxes from thermal dark matter relics in the whole multi-TeV range, a region hardly accessible to direct detection, collider searches and other indirect detection strategies. |
2105.06624 | Neil Barrie Dr. | Neil D. Barrie | Gravitational Leptogenesis in Bounce Cosmology | 31 pages, 17 figures | null | 10.1088/1475-7516/2021/06/049 | CTPU-PTC-21-16 | hep-ph gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate whether successful Gravitational Leptogenesis can take place
during an Ekpyrotic contraction phase. Two possible paths by which this can
occur are coupling the Ekpyrotic scalar to a gravitational Chern-Simons term,
or to a $ U(1) $ gauge field Chern-Simons term. These couplings lead to the
production of chiral gravitational waves, which generate a lepton number
asymmetry through the gravitational-lepton number anomaly. This lepton
asymmetry is subsequently reprocessed by equilibrium sphaleron processes to
produce a baryon asymmetry. We find successful Gravitational Leptogenesis to be
possible in Ekpyrotic bounce cosmologies through both of these mechanisms.
| [
{
"created": "Fri, 14 May 2021 03:03:53 GMT",
"version": "v1"
}
] | 2021-07-07 | [
[
"Barrie",
"Neil D.",
""
]
] | We investigate whether successful Gravitational Leptogenesis can take place during an Ekpyrotic contraction phase. Two possible paths by which this can occur are coupling the Ekpyrotic scalar to a gravitational Chern-Simons term, or to a $ U(1) $ gauge field Chern-Simons term. These couplings lead to the production of chiral gravitational waves, which generate a lepton number asymmetry through the gravitational-lepton number anomaly. This lepton asymmetry is subsequently reprocessed by equilibrium sphaleron processes to produce a baryon asymmetry. We find successful Gravitational Leptogenesis to be possible in Ekpyrotic bounce cosmologies through both of these mechanisms. |
1803.03647 | Timothy Cohen | Timothy Cohen, Nathaniel Craig, Gian F. Giudice, and Matthew
McCullough | The Hyperbolic Higgs | 25 pages, 3 figures; v2: minor changes, JHEP version; v3 minor
correction | null | 10.1007/JHEP05(2018)091 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce the Hyperbolic Higgs, a novel solution to the little hierarchy
problem that features Standard Model neutral scalar top partners. At one-loop
order, the protection from ultraviolet sensitivity is due to an accidental
non-compact symmetry of the Higgs potential that emerges in the infrared. Once
the general features of the effective description are detailed, a completion
that relies on a five dimensional supersymmetric framework is provided. Novel
phenomenology is compared and contrasted with the Twin Higgs scenario.
| [
{
"created": "Fri, 9 Mar 2018 19:00:00 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Jul 2018 22:50:19 GMT",
"version": "v2"
},
{
"created": "Wed, 11 Sep 2019 16:54:04 GMT",
"version": "v3"
}
] | 2019-09-12 | [
[
"Cohen",
"Timothy",
""
],
[
"Craig",
"Nathaniel",
""
],
[
"Giudice",
"Gian F.",
""
],
[
"McCullough",
"Matthew",
""
]
] | We introduce the Hyperbolic Higgs, a novel solution to the little hierarchy problem that features Standard Model neutral scalar top partners. At one-loop order, the protection from ultraviolet sensitivity is due to an accidental non-compact symmetry of the Higgs potential that emerges in the infrared. Once the general features of the effective description are detailed, a completion that relies on a five dimensional supersymmetric framework is provided. Novel phenomenology is compared and contrasted with the Twin Higgs scenario. |
1305.0624 | Somnath De | Somnath De | Extent of sensitivity of single photon production to parton distribution
functions | Minor revision in text, to appear in Pramana- journal of Physics | null | 10.1007/s12043-014-0765-y | null | hep-ph nucl-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have studied the production of single isolated prompt photons in high
energy proton-proton collisions at the RHIC ($\sqrt{s}$= 200 GeV) and the LHC
($\sqrt{s}$= 7 TeV) energies within the frame work of perturbative QCD upto
next-to leading order of strong coupling ($\alpha_s$). We have used five
different parameterizations of parton distribution function (PDF) starting from
the old CTEQ4M to the new CT10 distributions and compared our results with the
recent single prompt photon data from the PHENIX and the CMS collaborations.
The prompt photon cross-section is found to be described equally well by all
the PDF's within the experimental errors at the RHIC and the LHC energies. The
deviation in the prompt photon yield for different PDF sets is within $\pm$ 20%
when compared to CTEQ4M. The diphoton measurement could be a potential
candidate to constrain the gluon distribution inside the proton.
| [
{
"created": "Fri, 3 May 2013 05:43:01 GMT",
"version": "v1"
},
{
"created": "Tue, 31 Dec 2013 13:05:46 GMT",
"version": "v2"
}
] | 2017-08-02 | [
[
"De",
"Somnath",
""
]
] | We have studied the production of single isolated prompt photons in high energy proton-proton collisions at the RHIC ($\sqrt{s}$= 200 GeV) and the LHC ($\sqrt{s}$= 7 TeV) energies within the frame work of perturbative QCD upto next-to leading order of strong coupling ($\alpha_s$). We have used five different parameterizations of parton distribution function (PDF) starting from the old CTEQ4M to the new CT10 distributions and compared our results with the recent single prompt photon data from the PHENIX and the CMS collaborations. The prompt photon cross-section is found to be described equally well by all the PDF's within the experimental errors at the RHIC and the LHC energies. The deviation in the prompt photon yield for different PDF sets is within $\pm$ 20% when compared to CTEQ4M. The diphoton measurement could be a potential candidate to constrain the gluon distribution inside the proton. |
1303.7356 | Hiroshi Okada | Yuji Kajiyama, Hiroshi Okada, Takashi Toma | Multicomponent dark matter particles in a two-loop neutrino model | 16 pages, 5 figures, 2 tables; version accepted for publication in
Physical Review D | null | 10.1103/PhysRevD.88.015029 | KIAS-P13014; IPPP-13-14; DCPT-13-28 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct a loop induced seesaw model in a TeV scale theory with gauged
U(1)_{B-L} symmetry. Light neutrino masses are generated at two-loop level and
right-handed neutrinos also obtain their masses by one-loop effect.
Multi-component Dark Matters (DMs) are included in our model due to the remnant
discrete symmetry after the B-L symmetry breaking and the Z_2 parity which is
originally imposed to the model. We investigate the multi-component DM
properties, in which we have two fermionic DMs with different mass scales,
O(10) GeV and O(100-1000) GeV. The former mass corresponds to the lightest
right-handed neutrino mass induced by the loop effect, although the latter one
to the SM gauge singlet fermion. We show each of the DM annihilation processes
and compare to the the observation of relic abundance, together with the
constraints of Lepton Flavor Violation (LFV) and active neutrino masses.
Moreover we show that our model has some parameter region allowed by the direct
detection result reported by XENON100, and it is possible to verify the model
by the future XENON experiment.
| [
{
"created": "Fri, 29 Mar 2013 10:38:55 GMT",
"version": "v1"
},
{
"created": "Wed, 3 Apr 2013 10:43:57 GMT",
"version": "v2"
},
{
"created": "Mon, 8 Jul 2013 15:29:38 GMT",
"version": "v3"
}
] | 2013-08-09 | [
[
"Kajiyama",
"Yuji",
""
],
[
"Okada",
"Hiroshi",
""
],
[
"Toma",
"Takashi",
""
]
] | We construct a loop induced seesaw model in a TeV scale theory with gauged U(1)_{B-L} symmetry. Light neutrino masses are generated at two-loop level and right-handed neutrinos also obtain their masses by one-loop effect. Multi-component Dark Matters (DMs) are included in our model due to the remnant discrete symmetry after the B-L symmetry breaking and the Z_2 parity which is originally imposed to the model. We investigate the multi-component DM properties, in which we have two fermionic DMs with different mass scales, O(10) GeV and O(100-1000) GeV. The former mass corresponds to the lightest right-handed neutrino mass induced by the loop effect, although the latter one to the SM gauge singlet fermion. We show each of the DM annihilation processes and compare to the the observation of relic abundance, together with the constraints of Lepton Flavor Violation (LFV) and active neutrino masses. Moreover we show that our model has some parameter region allowed by the direct detection result reported by XENON100, and it is possible to verify the model by the future XENON experiment. |
1008.0506 | Marco Regis | Marco Regis (Cape Town) | Particle Dark Matter: the state of the art | Review talk presented at Vulcano 2010 workshop (Vulcano, May 2010).
To appear in "Frontier Objects in Astrophysics and Particle Physics", F.
Giovannelli & G. Mannocchi (eds.) | null | null | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Although well established observations on cosmological, cluster, and galactic
scales strongly suggest the existence of dark matter (DM), our understanding of
its non-gravitational properties is still lacking. I review basic aspects of
particle dark matter and detection strategies, outlining the state of the art
for searches in direct detection experiments, indirect observations, and
particle production at colliders. A particular focus is dedicated to recent
experimental results which could have provided hints for unveiling the DM
nature.
| [
{
"created": "Tue, 3 Aug 2010 10:09:30 GMT",
"version": "v1"
}
] | 2010-08-04 | [
[
"Regis",
"Marco",
"",
"Cape Town"
]
] | Although well established observations on cosmological, cluster, and galactic scales strongly suggest the existence of dark matter (DM), our understanding of its non-gravitational properties is still lacking. I review basic aspects of particle dark matter and detection strategies, outlining the state of the art for searches in direct detection experiments, indirect observations, and particle production at colliders. A particular focus is dedicated to recent experimental results which could have provided hints for unveiling the DM nature. |
0712.0697 | Ambar Ghosal | Debasish Majumdar and Ambar Ghosal | Investigating Possible Neutrino Decay in Long Baseline Experiment Using
ICAL as Far end Detector | 7 pages LaTeX, 4 pdf figures | null | null | null | hep-ph | null | We investigate the effects of possible decay of neutrinos from a neutrino
factory in a long baseline experiment. We consider the neutrinos from a factory
at CERN and the detector to be the 50 kTon iron calorimeter (ICAL) detector
proposed for India-based Neutrino Observatory (INO). We found considerable
depletion of muon yield at INO for certain value of decay parameters.
| [
{
"created": "Wed, 5 Dec 2007 11:49:34 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Dec 2007 06:52:50 GMT",
"version": "v2"
}
] | 2007-12-06 | [
[
"Majumdar",
"Debasish",
""
],
[
"Ghosal",
"Ambar",
""
]
] | We investigate the effects of possible decay of neutrinos from a neutrino factory in a long baseline experiment. We consider the neutrinos from a factory at CERN and the detector to be the 50 kTon iron calorimeter (ICAL) detector proposed for India-based Neutrino Observatory (INO). We found considerable depletion of muon yield at INO for certain value of decay parameters. |
2202.01082 | Stefan Prestel | Valerio Bertone and Stefan Prestel | Combining N3LO QCD calculations and parton showers for hadronic
collision events | null | null | null | LU-TP-22-06 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Detailed and precise background predictions are the backbone of large parts
of high-energy collider phenomenology. This requires to embed precision QCD
calculations into detailed event generators, to produce comprehensive software
simulations. Only continued progress in this direction will allow us to exploit
the full potential of measurements at the Large Hadron Collider, or at a future
Electron-Ion Collider. This work presents a method to combine third-order QCD
calculations for hadronic scattering processes with Monte-Carlo event
generators, thus enabling a new generation of precision predictions.
| [
{
"created": "Wed, 2 Feb 2022 15:18:38 GMT",
"version": "v1"
}
] | 2022-02-03 | [
[
"Bertone",
"Valerio",
""
],
[
"Prestel",
"Stefan",
""
]
] | Detailed and precise background predictions are the backbone of large parts of high-energy collider phenomenology. This requires to embed precision QCD calculations into detailed event generators, to produce comprehensive software simulations. Only continued progress in this direction will allow us to exploit the full potential of measurements at the Large Hadron Collider, or at a future Electron-Ion Collider. This work presents a method to combine third-order QCD calculations for hadronic scattering processes with Monte-Carlo event generators, thus enabling a new generation of precision predictions. |
hep-ph/0606171 | Alex Rivero E | Alejandro Rivero | Mass terms to break susy-like degeneration | 6 pages | null | null | null | hep-ph | null | We suggest a very simple but general operator to break mass degeneration
between representations of the Poincare group having spin 1 and 1/2. A quantity
very similar, at experimental 0.13 $\sigma$ level, to Weinberg's angle, appears
during the process.
| [
{
"created": "Thu, 15 Jun 2006 18:38:38 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Rivero",
"Alejandro",
""
]
] | We suggest a very simple but general operator to break mass degeneration between representations of the Poincare group having spin 1 and 1/2. A quantity very similar, at experimental 0.13 $\sigma$ level, to Weinberg's angle, appears during the process. |
0907.2120 | Andreas Maier | Y. Kiyo, A. Maier, P. Maierhoefer, P. Marquard | Reconstruction of heavy quark current correlators at O(\alpha_s^3) | 24 pages, 4 figures | Nucl.Phys.B823:269-287,2009 | 10.1016/j.nuclphysb.2009.08.010 | TPP09-17, SFB/CPP-09-50 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct approximate formulas for the O(\alpha_s^3) QCD contributions to
vector, axial-vector, scalar and pseudo-scalar quark current correlators, which
are valid for arbitrary values of momenta and masses. The derivation is based
on conformal mapping and the Pade approximation procedure and incorporates
known expansions in the low energy, threshold and high energy regions. We use
our results to estimate additional terms in these expansions.
| [
{
"created": "Mon, 13 Jul 2009 12:27:38 GMT",
"version": "v1"
}
] | 2009-10-02 | [
[
"Kiyo",
"Y.",
""
],
[
"Maier",
"A.",
""
],
[
"Maierhoefer",
"P.",
""
],
[
"Marquard",
"P.",
""
]
] | We construct approximate formulas for the O(\alpha_s^3) QCD contributions to vector, axial-vector, scalar and pseudo-scalar quark current correlators, which are valid for arbitrary values of momenta and masses. The derivation is based on conformal mapping and the Pade approximation procedure and incorporates known expansions in the low energy, threshold and high energy regions. We use our results to estimate additional terms in these expansions. |
1503.06987 | C. Q. Geng | Chao-Qiang Geng and Lu-Hsing Tsai | Study of Two-Loop Neutrino Mass Generation Models | 20 pages, 3 figures | Annals of Physics 365 (2016) 210-222 | 10.1016/j.aop.2015.11.010 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the models with the Majorana neutrino masses generated radiatively
by two-loop diagrams due to the Yukawa $\rho \bar \ell_R^c \ell_R$ and
effective $\rho^{\pm\pm} W^\mp W^\mp$ couplings along with a scalar triplet
$\Delta$, where $\rho$ is a doubly charged singlet scalar, $\ell_R$ the charged
lepton and $W$ the charged gauge boson. A generic feature in these types of
models is that the neutrino mass spectrum has to be a normal hierarchy.
Furthermore, by using the neutrino oscillation data and comparing with the
global fitting result in the literature, we find a unique neutrino mass matrix
and predict the Dirac and two Majorana CP phases to be $1.40\pi$, $1.11\pi$ and
$1.47\pi$, respectively. We also discuss the model parameters constrained by
the lepton flavor violating processes and electroweak oblique parameters. In
addition, we show that the rate of the neutrinoless double beta decay
$(0\nu\beta\beta)$ can be as large as the current experimental bound as it is
dominated by the short-range contribution at tree level, whereas the
traditional long-range one is negligible.
| [
{
"created": "Tue, 24 Mar 2015 11:14:22 GMT",
"version": "v1"
}
] | 2016-02-08 | [
[
"Geng",
"Chao-Qiang",
""
],
[
"Tsai",
"Lu-Hsing",
""
]
] | We study the models with the Majorana neutrino masses generated radiatively by two-loop diagrams due to the Yukawa $\rho \bar \ell_R^c \ell_R$ and effective $\rho^{\pm\pm} W^\mp W^\mp$ couplings along with a scalar triplet $\Delta$, where $\rho$ is a doubly charged singlet scalar, $\ell_R$ the charged lepton and $W$ the charged gauge boson. A generic feature in these types of models is that the neutrino mass spectrum has to be a normal hierarchy. Furthermore, by using the neutrino oscillation data and comparing with the global fitting result in the literature, we find a unique neutrino mass matrix and predict the Dirac and two Majorana CP phases to be $1.40\pi$, $1.11\pi$ and $1.47\pi$, respectively. We also discuss the model parameters constrained by the lepton flavor violating processes and electroweak oblique parameters. In addition, we show that the rate of the neutrinoless double beta decay $(0\nu\beta\beta)$ can be as large as the current experimental bound as it is dominated by the short-range contribution at tree level, whereas the traditional long-range one is negligible. |
2101.11405 | Anton Baushev N | Anton N. Baushev | The relic neutrino composition as seen from Earth | 5 pages, 2 figures, a copy of submit/3219597, submitted on June 10,
2020 and removed by the arXiv moderators | Astronomy Reports, Volume 64, Issue 12, p.1005-1011, (2020) | 10.1134/S1063772920120021 | null | hep-ph astro-ph.CO astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Being generated, the relic neutrino background contained equal fractions of
electron $\nu_e$, muon $\nu_\mu$, and taon $\nu_\tau$ neutrinos. We show that
the gravitational field of our Galaxy and other nearby cosmic objects changes
this composition near the Solar System, enriching it with the heaviest neutrino
$nu_3$. This mass state is almost free of the electron component (only $\sim
2\%$ of $\nu_e$) and contains more muon component than the tau one. As a
result, the relic background becomes enriched with taon and particularly muon
neutrinos. The electron relic neutrinos are the rarest for a terrestrial
observer: instead of $1/3$, the relic background may contain only $\gtrsim
20\%$ of them.
| [
{
"created": "Mon, 18 Jan 2021 14:01:11 GMT",
"version": "v1"
}
] | 2021-01-28 | [
[
"Baushev",
"Anton N.",
""
]
] | Being generated, the relic neutrino background contained equal fractions of electron $\nu_e$, muon $\nu_\mu$, and taon $\nu_\tau$ neutrinos. We show that the gravitational field of our Galaxy and other nearby cosmic objects changes this composition near the Solar System, enriching it with the heaviest neutrino $nu_3$. This mass state is almost free of the electron component (only $\sim 2\%$ of $\nu_e$) and contains more muon component than the tau one. As a result, the relic background becomes enriched with taon and particularly muon neutrinos. The electron relic neutrinos are the rarest for a terrestrial observer: instead of $1/3$, the relic background may contain only $\gtrsim 20\%$ of them. |
0705.3939 | Rishikesh Vaidya | Chan-Chi Chiou, Otto C. W. Kong and Rishikesh D. Vaidya | Quark Loop Contributions to Neutron, Deuteron, and Mercury EDMs from
Supersymmetry without R parity | 16 pages, 10 figures, accepted for publication in Physical Review D | Phys.Rev.D76:013003,2007 | 10.1103/PhysRevD.76.013003 | NCU-HEP-k026 | hep-ph | null | We present a detailed analysis of the neutron, deuteron and mercury electric
dipole moment from supersymmetry without R parity, focusing on the quark-scalar
loop contributions. Being proportional to top Yukawa and top mass, such
contributions are often large. Analytical expressions illustrating the explicit
role of the R-parity violating parameters are given following perturbative
diagonalization of mass-squared matrices for the scalars. Dominant
contributions come from the combinations $B_i \lambda^{\prime}_{ij1}$ for which
we obtain robust bounds. It turns out that neutron and deuteron EDMs receive
much stronger contributions than mercury EDM and any null result at the future
deuteron EDM experiment or Los Alamos neutron EDM experiment can lead to
extra-ordinary constraints on RPV parameter space. Even if R-parity violating
couplings are real, CKM phase does induce RPV contribution and for some cases
such a contribution is as strong as contribution from phases in the R-parity
violating couplings.Hence, we have bounds directly on $|B_i
\lambda^{\prime}_{ij1}|$ even if the RPV parameters are all real.
Interestingly, even if slepton mass and/or $\mu_0$ is as high as 1 TeV, it
still leads to neutron EDM that is an order of magnitude larger than the
sensitivity at Los Alamos experiment. Since the results are not much sensitive
to $\tan \beta$, our constraints will survive even if other observables tighten
the constraints on $\tan \beta$.
| [
{
"created": "Sun, 27 May 2007 09:07:10 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Chiou",
"Chan-Chi",
""
],
[
"Kong",
"Otto C. W.",
""
],
[
"Vaidya",
"Rishikesh D.",
""
]
] | We present a detailed analysis of the neutron, deuteron and mercury electric dipole moment from supersymmetry without R parity, focusing on the quark-scalar loop contributions. Being proportional to top Yukawa and top mass, such contributions are often large. Analytical expressions illustrating the explicit role of the R-parity violating parameters are given following perturbative diagonalization of mass-squared matrices for the scalars. Dominant contributions come from the combinations $B_i \lambda^{\prime}_{ij1}$ for which we obtain robust bounds. It turns out that neutron and deuteron EDMs receive much stronger contributions than mercury EDM and any null result at the future deuteron EDM experiment or Los Alamos neutron EDM experiment can lead to extra-ordinary constraints on RPV parameter space. Even if R-parity violating couplings are real, CKM phase does induce RPV contribution and for some cases such a contribution is as strong as contribution from phases in the R-parity violating couplings.Hence, we have bounds directly on $|B_i \lambda^{\prime}_{ij1}|$ even if the RPV parameters are all real. Interestingly, even if slepton mass and/or $\mu_0$ is as high as 1 TeV, it still leads to neutron EDM that is an order of magnitude larger than the sensitivity at Los Alamos experiment. Since the results are not much sensitive to $\tan \beta$, our constraints will survive even if other observables tighten the constraints on $\tan \beta$. |
1602.07460 | Nikolai Kivel | N. Kivel and A. Kupsc | $\eta_{c}\rightarrow l^{+}l^{-}$ and $\chi_{c0}\rightarrow l^{+}l^{-}$
decays revisited | 5 pages, 1 figure | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a calculation of $\eta_{c}\rightarrow l^{+}l^{-}$ and
$\chi_{c0}\rightarrow l^{+}l^{-}$ decay widths. The amplitudes are computed
within leading-order approximation using NRQCD framework. Numerical results for
the branchings fractions are presented.
| [
{
"created": "Wed, 24 Feb 2016 10:42:47 GMT",
"version": "v1"
}
] | 2016-02-25 | [
[
"Kivel",
"N.",
""
],
[
"Kupsc",
"A.",
""
]
] | We present a calculation of $\eta_{c}\rightarrow l^{+}l^{-}$ and $\chi_{c0}\rightarrow l^{+}l^{-}$ decay widths. The amplitudes are computed within leading-order approximation using NRQCD framework. Numerical results for the branchings fractions are presented. |
hep-ph/9303291 | null | B. de Carlos and J.A. Casas | One-Loop Analysis of the Electroweak Breaking in Supersymmetric Models
and the Fine-Tuning Problems | 12 pages and 5 postscript files available upon request,
CERN-TH.6835/93 | Phys.Lett.B309:320-328,1993 | 10.1016/0370-2693(93)90940-J | null | hep-ph | null | We examine the electroweak breaking mechanism in the minimal supersymmetric
standard model (MSSM) using the {\em complete} one-loop effective potential
$V_1$. First, we study what is the region of the whole MSSM parameter space
(i.e. $M_{1/2},m_o,\mu,...$) that leads to a succesful $SU(2)\times U(1)$
breaking with an acceptable top quark mass. In doing this it is observed that
all the one-loop corrections to $V_1$ (even the apparently small ones) must be
taken into account in order to get reliable results. We find that the allowed
region of parameters is considerably enhanced with respect to former "improved"
tree level results. Next, we study the fine-tuning problem associated with the
high sensitivity of $M_Z$ to $h_t$ (the top Yukawa coupling). Again, we find
that this fine-tuning is appreciably smaller once the one-loop effects are
considered than in previous tree level calculations. Finally, we explore the
ambiguities and limitations of the ordinary criterion to estimate the degree of
fine-tuning. As a result of all this, the upper bounds on the MSSM parameters,
and hence on the supersymmetric masses, are substantially raised, thus
increasing the consistency between supersymmetry and observation.
| [
{
"created": "Tue, 23 Mar 1993 15:16:41 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"de Carlos",
"B.",
""
],
[
"Casas",
"J. A.",
""
]
] | We examine the electroweak breaking mechanism in the minimal supersymmetric standard model (MSSM) using the {\em complete} one-loop effective potential $V_1$. First, we study what is the region of the whole MSSM parameter space (i.e. $M_{1/2},m_o,\mu,...$) that leads to a succesful $SU(2)\times U(1)$ breaking with an acceptable top quark mass. In doing this it is observed that all the one-loop corrections to $V_1$ (even the apparently small ones) must be taken into account in order to get reliable results. We find that the allowed region of parameters is considerably enhanced with respect to former "improved" tree level results. Next, we study the fine-tuning problem associated with the high sensitivity of $M_Z$ to $h_t$ (the top Yukawa coupling). Again, we find that this fine-tuning is appreciably smaller once the one-loop effects are considered than in previous tree level calculations. Finally, we explore the ambiguities and limitations of the ordinary criterion to estimate the degree of fine-tuning. As a result of all this, the upper bounds on the MSSM parameters, and hence on the supersymmetric masses, are substantially raised, thus increasing the consistency between supersymmetry and observation. |
1706.08687 | A. N. Ivanov | A. N. Ivanov, R. H\"ollwieser, N. I. Troitskaya, M. Wellenzohn, Ya. A.
Berdnikov | Precision Theoretical Analysis of Neutron Radiative Beta Decay to Order
"O(\alpha^2/\pi^2)" | 46 pages, 6 figures | Phys. Rev. D95, 113006 (2017) | 10.1103/PhysRevD.95.113006 | null | hep-ph astro-ph.CO hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the Standard Model (SM) we calculate the decay rate of the neutron
radiative beta decay to order "O(\alpha^2/\pi^2 ~ 10^{-5})", where "\alpha$"is
the fine--structure constant, and radiative corrections to order "O(\alpha/\pi
~ 10^{-3})". The obtained results together with the recent analysis of the
neutron radiative beta decay to next-to-leading order in the large proton-mass
expansion, performed by Ivanov et al. Phys. Rev. D95, 033007 (2017), describe
recent experimental data by the RDK II Collaboration (Bales et al., Phys. Rev.
Lett. 116, 242501 (2016)) within 1.5 standard deviations. We argue a
substantial influence of strong low-energy interactions of hadrons coupled to
photons on the properties of the amplitude of the neutron radiative beta decay
under gauge transformations of real and virtual photons.
| [
{
"created": "Tue, 27 Jun 2017 06:39:21 GMT",
"version": "v1"
}
] | 2017-07-04 | [
[
"Ivanov",
"A. N.",
""
],
[
"Höllwieser",
"R.",
""
],
[
"Troitskaya",
"N. I.",
""
],
[
"Wellenzohn",
"M.",
""
],
[
"Berdnikov",
"Ya. A.",
""
]
] | In the Standard Model (SM) we calculate the decay rate of the neutron radiative beta decay to order "O(\alpha^2/\pi^2 ~ 10^{-5})", where "\alpha$"is the fine--structure constant, and radiative corrections to order "O(\alpha/\pi ~ 10^{-3})". The obtained results together with the recent analysis of the neutron radiative beta decay to next-to-leading order in the large proton-mass expansion, performed by Ivanov et al. Phys. Rev. D95, 033007 (2017), describe recent experimental data by the RDK II Collaboration (Bales et al., Phys. Rev. Lett. 116, 242501 (2016)) within 1.5 standard deviations. We argue a substantial influence of strong low-energy interactions of hadrons coupled to photons on the properties of the amplitude of the neutron radiative beta decay under gauge transformations of real and virtual photons. |
1005.3980 | Lance Labun | Y. Hadad, L. Labun, J. Rafelski, N. Elkina, C. Klier, H. Ruhl | Effects of Radiation-Reaction in Relativistic Laser Acceleration | 16 pages, 11 figures; added appendix comparing to previously
published results; in press with Phys Rev D | Phys.Rev.D82:096012,2010 | 10.1103/PhysRevD.82.096012 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The goal of this paper is twofold: to explore the response of classical
charges to electromagnetic force at the level of unity in natural units and to
establish a criterion that determines physical parameters for which the related
radiation-reaction effects are detectable. In pursuit of this goal, the
Landau-Lifshitz equation is solved analytically for an arbitrary (transverse)
electromagnetic pulse. A comparative study of the radiation emission of an
electron in a linearly polarized pulse for the Landau-Lifshitz equation and for
the Lorentz force equation reveals the radiation-reaction dominated regime, in
which radiation-reaction effects overcome the influence of the external fields.
The case of a relativistic electron that is slowed down by a counter
propagating electromagnetic pulse is studied in detail. We further show that
when the electron experiences acceleration of order unity, the dynamics of the
Lorentz force equation, the Landau-Lifshitz equation and the
Lorentz-Abraham-Dirac equation all result in different radiation emission that
could be distinguished in experiment. Finally, our analytic and numerical
results are compared with those appearing in the literature.
| [
{
"created": "Fri, 21 May 2010 15:15:52 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Sep 2010 19:27:07 GMT",
"version": "v2"
},
{
"created": "Tue, 16 Nov 2010 22:32:22 GMT",
"version": "v3"
}
] | 2010-12-23 | [
[
"Hadad",
"Y.",
""
],
[
"Labun",
"L.",
""
],
[
"Rafelski",
"J.",
""
],
[
"Elkina",
"N.",
""
],
[
"Klier",
"C.",
""
],
[
"Ruhl",
"H.",
""
]
] | The goal of this paper is twofold: to explore the response of classical charges to electromagnetic force at the level of unity in natural units and to establish a criterion that determines physical parameters for which the related radiation-reaction effects are detectable. In pursuit of this goal, the Landau-Lifshitz equation is solved analytically for an arbitrary (transverse) electromagnetic pulse. A comparative study of the radiation emission of an electron in a linearly polarized pulse for the Landau-Lifshitz equation and for the Lorentz force equation reveals the radiation-reaction dominated regime, in which radiation-reaction effects overcome the influence of the external fields. The case of a relativistic electron that is slowed down by a counter propagating electromagnetic pulse is studied in detail. We further show that when the electron experiences acceleration of order unity, the dynamics of the Lorentz force equation, the Landau-Lifshitz equation and the Lorentz-Abraham-Dirac equation all result in different radiation emission that could be distinguished in experiment. Finally, our analytic and numerical results are compared with those appearing in the literature. |
hep-ph/9911236 | Norbert Magnussen | Norbert Magnussen (University of Wuppertal) | Astroparticle Physics | 20 pages, 18 figures; Invited talk at the International Europhysics
Conference on High Energy Physics, Tampere, Finland, 15-21 July 1999. To
appear in Conf. Proceedings edited by K. Huitu, H. Kurki-Suonio and J.
Maalampi (IOP Publishing, Bristol, UK) | null | null | WUB-99-27 | hep-ph astro-ph | null | This article reviews some recent developments in Astroparticle Physics. Due
to the extension of the field only part of the results and developments can be
covered. The status of the search for Dark Matter, some recent results on
Cosmic Rays and Gamma Ray Astronomy and the status of Neutrino Astronomy are
presented.
| [
{
"created": "Thu, 4 Nov 1999 11:42:14 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Magnussen",
"Norbert",
"",
"University of Wuppertal"
]
] | This article reviews some recent developments in Astroparticle Physics. Due to the extension of the field only part of the results and developments can be covered. The status of the search for Dark Matter, some recent results on Cosmic Rays and Gamma Ray Astronomy and the status of Neutrino Astronomy are presented. |
hep-ph/0307027 | Giovanni Amelino-Camelia | Giovanni Amelino-Camelia, Michele Arzano, Y. Jack NG, Tsvi Piran,
Hendrik Van Dam | Implications of Spacetime Quantization for the Bahcall-Waxman Neutrino
Bound | 10 pages, Latex | JCAP 0402 (2004) 009 | 10.1088/1475-7516/2004/02/009 | null | hep-ph astro-ph | null | There is growing interest in quantum-spacetime models in which small
departures from Lorentz symmetry are governed by the Planck scale. In
particular, several studies have considered the possibility that these small
violations of Lorentz symmetry may affect various astrophysical observations,
such as the evaluation of the GZK limit for cosmic rays, the interaction of TeV
photons with the Far Infrared Background and the arrival time of photons with
different energies from cosmological sources. We show that the same
Planck-scale departures from Lorentz symmetry that lead to a modification of
the GZK limit which would be consistent with the observations reported by
AGASA, also have significant implications for the evaluation of the
Bahcall-Waxman bound on the flux of high-energy neutrinos produced by
photo-meson interactions in sources of size not much larger than the proton
photo-meson mean free path.
| [
{
"created": "Wed, 2 Jul 2003 01:15:03 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Amelino-Camelia",
"Giovanni",
""
],
[
"Arzano",
"Michele",
""
],
[
"NG",
"Y. Jack",
""
],
[
"Piran",
"Tsvi",
""
],
[
"Van Dam",
"Hendrik",
""
]
] | There is growing interest in quantum-spacetime models in which small departures from Lorentz symmetry are governed by the Planck scale. In particular, several studies have considered the possibility that these small violations of Lorentz symmetry may affect various astrophysical observations, such as the evaluation of the GZK limit for cosmic rays, the interaction of TeV photons with the Far Infrared Background and the arrival time of photons with different energies from cosmological sources. We show that the same Planck-scale departures from Lorentz symmetry that lead to a modification of the GZK limit which would be consistent with the observations reported by AGASA, also have significant implications for the evaluation of the Bahcall-Waxman bound on the flux of high-energy neutrinos produced by photo-meson interactions in sources of size not much larger than the proton photo-meson mean free path. |
hep-ph/0612012 | Bugaev | E.V. Bugaev | Photoabsorption cross sections at superhigh energies of real photons | Paper presented for Proceedings of XIV International Symposium on
Very High Energy Cosmic Ray Interactions, Weihai, China, August 15-22, 2006.
4 pages, 1 figure. Some changes with additional clarifications are made | null | null | null | hep-ph | null | The brief review of modern theoretical models describing the process of the
photon absorption by nucleons at superhigh energies of real photons is given.
The main aim of the work is an estimation of the theoretical uncertainty of the
cross section prediction at photon energies around 10^19-10^20 eV.
| [
{
"created": "Fri, 1 Dec 2006 16:15:41 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Dec 2006 14:15:46 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Bugaev",
"E. V.",
""
]
] | The brief review of modern theoretical models describing the process of the photon absorption by nucleons at superhigh energies of real photons is given. The main aim of the work is an estimation of the theoretical uncertainty of the cross section prediction at photon energies around 10^19-10^20 eV. |
hep-ph/9507305 | Biswarup Mukhopadhyaya | Anirban Kundu and Biswarup Mukhopadhyaya | A General Higgs Sector: Constraints and Phenomenology | 42 pages, LATEX, 4 figures (hard copies of figures available on
request) | Int.J.Mod.Phys. A11 (1996) 5221-5244 | 10.1142/S0217751X9600239X | SINP/TNP-95-10 MRI-PHY/15/95 | hep-ph | null | We have investigated some phenomenological aspects of an $SU(2)\times U(1)$
scenario where scalars belonging to arbitrary representations of $SU(2)$ are
involved in electroweak symmetry breaking. The resulting interaction terms are
derived. Some constraints are obtained on the arbitrary scalar sector from the
requirement of tree-level unitarity in longitudinal gauge boson scattering. We
also show that, in cases where the scalars ensure $\rho=1$ at tree-level,
useful restrictions on their parameter space follow from precision measurements
of the $Zb\bar b$ vertex. Finally, some salient features about the production
of such Higgs bosons in $e^+e^-$ collision are discussed.
| [
{
"created": "Mon, 10 Jul 1995 14:46:55 GMT",
"version": "v1"
},
{
"created": "Sat, 15 Jul 1995 07:16:38 GMT",
"version": "v2"
}
] | 2009-10-28 | [
[
"Kundu",
"Anirban",
""
],
[
"Mukhopadhyaya",
"Biswarup",
""
]
] | We have investigated some phenomenological aspects of an $SU(2)\times U(1)$ scenario where scalars belonging to arbitrary representations of $SU(2)$ are involved in electroweak symmetry breaking. The resulting interaction terms are derived. Some constraints are obtained on the arbitrary scalar sector from the requirement of tree-level unitarity in longitudinal gauge boson scattering. We also show that, in cases where the scalars ensure $\rho=1$ at tree-level, useful restrictions on their parameter space follow from precision measurements of the $Zb\bar b$ vertex. Finally, some salient features about the production of such Higgs bosons in $e^+e^-$ collision are discussed. |
1506.08780 | Danny van Dyk | Thomas Mannel, Danny van Dyk (Siegen U.) | Zero-Recoil Sum Rules for $\Lambda_b \to \Lambda_c$ Form Factors | 8 pages, 5 figures | null | 10.1016/j.physletb.2015.10.016 | SI-HEP-2015-14, QFET-2015-21, EOS-2015-02 | hep-ph hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We set up a zero recoil sum rule to constrain the form factors of the
$\Lambda_b \to \Lambda_c$ transition. Our results are compared with the recent
lattice calculation for these transitions. We find the same situation as in the
case for $B \to D^*$: The lattice results practically saturate the sum rules,
leaving basically no room for excited states.
| [
{
"created": "Mon, 29 Jun 2015 18:56:09 GMT",
"version": "v1"
}
] | 2015-10-21 | [
[
"Mannel",
"Thomas",
"",
"Siegen U."
],
[
"van Dyk",
"Danny",
"",
"Siegen U."
]
] | We set up a zero recoil sum rule to constrain the form factors of the $\Lambda_b \to \Lambda_c$ transition. Our results are compared with the recent lattice calculation for these transitions. We find the same situation as in the case for $B \to D^*$: The lattice results practically saturate the sum rules, leaving basically no room for excited states. |
hep-ph/9910389 | Sergey Mikhailov | S.V. Mikhailov | A multiloop improvement of non-singlet QCD evolution equations | 13 pages, revtex, 2 figures are enclosed as eps-file, the text style
and figures are corrected following version, accepted for publication to
Phys. Rev. D | Phys.Rev.D62:034002,2000 | 10.1103/PhysRevD.62.034002 | E2-99-261 JINR, Dubna | hep-ph | null | An approach is elaborated for calculation of "all loop" contributions to the
non-singlet evolution kernels from the diagrams with renormalon chain
insertions. Closed expressions are obtained for sums of contributions to
kernels $P(z)$ for the DGLAP equation and $V(x,y)$ for the "nonforward" ER-BL
equation from these diagrams that dominate for a large value of $b_0$, the
first $\beta$-function coefficient. Calculations are performed in the covariant
$\xi$-gauge in a MS-like scheme. It is established that a special choice of the
gauge parameter $\xi=-3$ generalizes the standard "naive nonabelianization"
approximation. The solutions are obtained to the ER-BL evolution equation
(taken at the "all loop" improved kernel), which are in form similar to
one-loop solutions. A consequence for QCD descriptions of hard processes and
the benefits and incompleteness of the approach are briefly discussed.
| [
{
"created": "Mon, 18 Oct 1999 15:30:17 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Mar 2000 22:44:27 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Mikhailov",
"S. V.",
""
]
] | An approach is elaborated for calculation of "all loop" contributions to the non-singlet evolution kernels from the diagrams with renormalon chain insertions. Closed expressions are obtained for sums of contributions to kernels $P(z)$ for the DGLAP equation and $V(x,y)$ for the "nonforward" ER-BL equation from these diagrams that dominate for a large value of $b_0$, the first $\beta$-function coefficient. Calculations are performed in the covariant $\xi$-gauge in a MS-like scheme. It is established that a special choice of the gauge parameter $\xi=-3$ generalizes the standard "naive nonabelianization" approximation. The solutions are obtained to the ER-BL evolution equation (taken at the "all loop" improved kernel), which are in form similar to one-loop solutions. A consequence for QCD descriptions of hard processes and the benefits and incompleteness of the approach are briefly discussed. |
hep-ph/9710372 | Tim M. P. Tait | Tim Tait and C.--P. Yuan (Michigan State University) | The Phenomenology of Single Top Quark Production at the Fermilab
Tevatron | 29 pages, Latex, uses psfig.tex | null | null | MSUHEP-71015 ANL-HEP-PR-97-85 | hep-ph hep-ex | null | Single top quark production at the Fermilab Tevatron Run II (a p \bar{p}
collider with \sqrt{S} = 2 TeV) proceeds dominantly via two sub-processes, a
t-channel W-gluon fusion process, and an s-channel W^* process. We show that
these two sub-processes have different sensitivities to new physics effects in
the top quark's electro-weak interactions. The W^* process is sensitive to new
heavy charged resonances, such as a W' boson, while the W-gluon fusion process
is more sensitive to modifications to the top's interaction, including
flavor-changing neutral currents involving the top quark. We examine the
implications of these results on our ability to measure V_{tb} with confidence,
and propose a quantity R = \sigma_{Wg} / \sigma_{W^*}, which may be studied in
order to characterize the confidence one may place upon a given measurement of
V_{tb} from single top production.
| [
{
"created": "Thu, 16 Oct 1997 03:52:02 GMT",
"version": "v1"
}
] | 2016-09-06 | [
[
"Tait",
"Tim",
"",
"Michigan State University"
],
[
"Yuan",
"C. --P.",
"",
"Michigan State University"
]
] | Single top quark production at the Fermilab Tevatron Run II (a p \bar{p} collider with \sqrt{S} = 2 TeV) proceeds dominantly via two sub-processes, a t-channel W-gluon fusion process, and an s-channel W^* process. We show that these two sub-processes have different sensitivities to new physics effects in the top quark's electro-weak interactions. The W^* process is sensitive to new heavy charged resonances, such as a W' boson, while the W-gluon fusion process is more sensitive to modifications to the top's interaction, including flavor-changing neutral currents involving the top quark. We examine the implications of these results on our ability to measure V_{tb} with confidence, and propose a quantity R = \sigma_{Wg} / \sigma_{W^*}, which may be studied in order to characterize the confidence one may place upon a given measurement of V_{tb} from single top production. |
1210.5754 | Alexander Berezhnoy | A. V. Berezhnoy, A. K. Likhoded and A. A. Novoselov | $\Upsilon$-meson pair production at LHC | 12 page, 5 figures. Several references have been added. English has
been improved | null | 10.1103/PhysRevD.87.054023 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Theoretical predictions for $pp\to 2 \Upsilon+X$ cross section at
$\sqrt{s}=8$ TeV for the LHCb and ATLAS kinematical conditions are obtained. A
possibility to observe the new hypothetical particles containing two valence
$b$-quarks and two valence $\bar{b}$-quarks is discussed.
| [
{
"created": "Sun, 21 Oct 2012 19:23:09 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Oct 2012 17:33:13 GMT",
"version": "v2"
},
{
"created": "Mon, 10 Dec 2012 11:18:51 GMT",
"version": "v3"
}
] | 2013-03-27 | [
[
"Berezhnoy",
"A. V.",
""
],
[
"Likhoded",
"A. K.",
""
],
[
"Novoselov",
"A. A.",
""
]
] | Theoretical predictions for $pp\to 2 \Upsilon+X$ cross section at $\sqrt{s}=8$ TeV for the LHCb and ATLAS kinematical conditions are obtained. A possibility to observe the new hypothetical particles containing two valence $b$-quarks and two valence $\bar{b}$-quarks is discussed. |
1209.2870 | Jorge Martin Camalich | J. M. Alarcon, L. S. Geng, J. Martin Camalich, J. A. Oller | The strangeness content of the nucleon from effective field theory and
phenomenology | V2 accepted for publication in Physics Letters B | null | null | null | hep-ph hep-lat nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We revisit the classical relation between the strangeness content of the
nucleon, the pion-nucleon sigma term and the $SU(3)_F$ breaking of the baryon
masses in the context of Lorentz covariant chiral perturbation theory with
explicit decuplet-baryon resonance fields. We find that a value of the
pion-nucleon sigma term of $\sim$60 MeV is not necessarily at odds with a small
strangeness content of the nucleon, in line with the fulfillment of the OZI
rule. Moreover, this value is indeed favored by our next-to-leading order
calculation. We compare our results with earlier ones and discuss the
convergence of the chiral series as well as the uncertainties of chiral
approaches to the determination of the sigma terms.
| [
{
"created": "Thu, 13 Sep 2012 12:21:50 GMT",
"version": "v1"
},
{
"created": "Mon, 17 Feb 2014 20:02:22 GMT",
"version": "v2"
}
] | 2014-02-18 | [
[
"Alarcon",
"J. M.",
""
],
[
"Geng",
"L. S.",
""
],
[
"Camalich",
"J. Martin",
""
],
[
"Oller",
"J. A.",
""
]
] | We revisit the classical relation between the strangeness content of the nucleon, the pion-nucleon sigma term and the $SU(3)_F$ breaking of the baryon masses in the context of Lorentz covariant chiral perturbation theory with explicit decuplet-baryon resonance fields. We find that a value of the pion-nucleon sigma term of $\sim$60 MeV is not necessarily at odds with a small strangeness content of the nucleon, in line with the fulfillment of the OZI rule. Moreover, this value is indeed favored by our next-to-leading order calculation. We compare our results with earlier ones and discuss the convergence of the chiral series as well as the uncertainties of chiral approaches to the determination of the sigma terms. |
hep-ph/9301217 | Janne Ignatius | J. Ignatius | Bubble Free Energy in Cosmological Phase Transitions | 9 pages ( + 7 figures, available on request as a 130 kB Postscript
file or by fax or mail), plain Latex, HU-TFT-92-52 | Phys.Lett.B309:252-257,1993 | 10.1016/0370-2693(93)90929-C | null | hep-ph | null | Free energy as a function of temperature and the bubble radius is determined
for spherical bubbles created in cosmological first order phase transitions.
The phase transition is assumed to be driven by an order parameter (e.g. a
Higgs field) with quartic potential. The definition of the bubble radius and
the corresponding generalized, curvature-dependent surface tensions are
discussed. In the free energy expansion in powers of the inverse radius, the
coefficients of the curvature term and the constant term are also calculated.
| [
{
"created": "Thu, 7 Jan 1993 18:10:19 GMT",
"version": "v1"
}
] | 2010-11-01 | [
[
"Ignatius",
"J.",
""
]
] | Free energy as a function of temperature and the bubble radius is determined for spherical bubbles created in cosmological first order phase transitions. The phase transition is assumed to be driven by an order parameter (e.g. a Higgs field) with quartic potential. The definition of the bubble radius and the corresponding generalized, curvature-dependent surface tensions are discussed. In the free energy expansion in powers of the inverse radius, the coefficients of the curvature term and the constant term are also calculated. |
1308.1430 | Kalanand Mishra | Kalanand Mishra, Luca Barz\`e, Thomas Becher, Mauro Chiesa, Stefan
Dittmaier, Xavier Garcia i Tormo, Alexander Huss, Tobias Kasprzik, Ye Li,
Guido Montagna, Mauro Moretti, Oreste Nicrosini, Frank Petriello, Fulvio
Piccinini, Francesco Tramontano | Electroweak Corrections at High Energies | Contribution to the Snowmass-2013 report of the QCD Working Group. 15
pages, 14 figures, 5 tables. Version 2: Added a new section 4A and updated
the author list, acknowledgements, and references. Version 3: Added a new
reference Ref.[36] | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a survey of the most abundant processes at the LHC for sensitivity
to electroweak corrections at \sqrt{s} = 8, 14, 33, and 100 TeV proton-proton
collision energies. The processes studied are pp -> dijet, inclusive W and Z,
W/Z+jets, and WW. In each case we compare the experimental uncertainty in the
highest kinematic regions of interest with the relative magnitude of
electroweak corrections and fixed-order \alpha_S calculations.
| [
{
"created": "Tue, 6 Aug 2013 22:25:12 GMT",
"version": "v1"
},
{
"created": "Fri, 9 Aug 2013 21:47:22 GMT",
"version": "v2"
},
{
"created": "Fri, 16 Aug 2013 05:38:48 GMT",
"version": "v3"
}
] | 2013-08-19 | [
[
"Mishra",
"Kalanand",
""
],
[
"Barzè",
"Luca",
""
],
[
"Becher",
"Thomas",
""
],
[
"Chiesa",
"Mauro",
""
],
[
"Dittmaier",
"Stefan",
""
],
[
"Tormo",
"Xavier Garcia i",
""
],
[
"Huss",
"Alexander",
""
],
[
"Kasprzik",
"Tobias",
""
],
[
"Li",
"Ye",
""
],
[
"Montagna",
"Guido",
""
],
[
"Moretti",
"Mauro",
""
],
[
"Nicrosini",
"Oreste",
""
],
[
"Petriello",
"Frank",
""
],
[
"Piccinini",
"Fulvio",
""
],
[
"Tramontano",
"Francesco",
""
]
] | We present a survey of the most abundant processes at the LHC for sensitivity to electroweak corrections at \sqrt{s} = 8, 14, 33, and 100 TeV proton-proton collision energies. The processes studied are pp -> dijet, inclusive W and Z, W/Z+jets, and WW. In each case we compare the experimental uncertainty in the highest kinematic regions of interest with the relative magnitude of electroweak corrections and fixed-order \alpha_S calculations. |
hep-ph/0108157 | Zygmunt Ajduk | Wojciech Krolikowski | An effective model for quark masses and mixings | 22 pages | Acta Phys.Polon. B32 (2001) 2961-2980 | null | IFT-01/25 | hep-ph | null | By analogy with an effective model of charged-lepton mass matrix that, with
the inputs of $m^{exp}_e $ and $m^{exp}_\mu$, predicts (in a perturbative zero
order) $m_\tau = 1776.80 $ MeV close to $m^{exp}_\tau =
1777.03^{+0.30}_{-0.26}$ MeV, we construct such a model for quark mass matrices
reproducing consistently the bulk of experimental information on quark masses
and mixings. In particular, the model predicts $|V_{u b}| = 0.00313$, $\gamma =
- \arg V_{u b} = 63.8^\circ$ and $|V_{t d}| = 0.00785$, $\beta = - \arg V_{t d}
= 20.7^\circ$ (i.e., $\sin 2\beta = 0.661$ to be compared with the BaBar value
$\sin 2\beta^{exp} = 0.59 \pm 0.14$), if the figures $|V^{exp}_{u s}| =
0.2196$, $|V^{exp}_{c b}| = 0.0402$ and $m^{exp}_{s} = 123$ MeV, $m^{exp}_{c} =
1.25$ GeV, $m^{exp}_{b} = 4.2$ GeV are used as inputs. Also the rest of CKM
matrix elements is predicted consistently by the experimental data. Here, quark
masses and CKM matrix elements (ten independent quantities) are parametrized by
eight independent model constants, what gives two independent predictions, e.g.
for $|V_{ub}|$ and $\beta$. The considered model deals with the
fundamental-fermion Dirac mass matrices, so that the neutrino Majorana mass
matrix is outside the scheme. Some foundations of the model are collected in
Appendix.
| [
{
"created": "Mon, 20 Aug 2001 13:08:47 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Krolikowski",
"Wojciech",
""
]
] | By analogy with an effective model of charged-lepton mass matrix that, with the inputs of $m^{exp}_e $ and $m^{exp}_\mu$, predicts (in a perturbative zero order) $m_\tau = 1776.80 $ MeV close to $m^{exp}_\tau = 1777.03^{+0.30}_{-0.26}$ MeV, we construct such a model for quark mass matrices reproducing consistently the bulk of experimental information on quark masses and mixings. In particular, the model predicts $|V_{u b}| = 0.00313$, $\gamma = - \arg V_{u b} = 63.8^\circ$ and $|V_{t d}| = 0.00785$, $\beta = - \arg V_{t d} = 20.7^\circ$ (i.e., $\sin 2\beta = 0.661$ to be compared with the BaBar value $\sin 2\beta^{exp} = 0.59 \pm 0.14$), if the figures $|V^{exp}_{u s}| = 0.2196$, $|V^{exp}_{c b}| = 0.0402$ and $m^{exp}_{s} = 123$ MeV, $m^{exp}_{c} = 1.25$ GeV, $m^{exp}_{b} = 4.2$ GeV are used as inputs. Also the rest of CKM matrix elements is predicted consistently by the experimental data. Here, quark masses and CKM matrix elements (ten independent quantities) are parametrized by eight independent model constants, what gives two independent predictions, e.g. for $|V_{ub}|$ and $\beta$. The considered model deals with the fundamental-fermion Dirac mass matrices, so that the neutrino Majorana mass matrix is outside the scheme. Some foundations of the model are collected in Appendix. |
0906.3579 | Takuya Kanazawa | Takuya Kanazawa, Tilo Wettig, Naoki Yamamoto | Chiral Lagrangian and spectral sum rules for dense two-color QCD | 24 pages, 1 table, no figure | JHEP 0908:003,2009 | 10.1088/1126-6708/2009/08/003 | TKYNT-09-10 | hep-ph hep-lat hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analytically study two-color QCD with an even number of flavors at high
baryon density. This theory is free from the fermion sign problem. Chiral
symmetry is broken spontaneously by the diquark condensate. Based on the
symmetry breaking pattern we construct the low-energy effective Lagrangian for
the Nambu-Goldstone bosons. We identify a new epsilon-regime at high baryon
density in which the quark mass dependence of the partition function can be
determined exactly. We also derive Leutwyler-Smilga-type spectral sum rules for
the complex eigenvalues of the Dirac operator in terms of the fermion gap. Our
results can in principle be tested in lattice QCD simulations.
| [
{
"created": "Fri, 19 Jun 2009 06:22:05 GMT",
"version": "v1"
},
{
"created": "Sun, 9 Aug 2009 08:07:01 GMT",
"version": "v2"
}
] | 2009-09-25 | [
[
"Kanazawa",
"Takuya",
""
],
[
"Wettig",
"Tilo",
""
],
[
"Yamamoto",
"Naoki",
""
]
] | We analytically study two-color QCD with an even number of flavors at high baryon density. This theory is free from the fermion sign problem. Chiral symmetry is broken spontaneously by the diquark condensate. Based on the symmetry breaking pattern we construct the low-energy effective Lagrangian for the Nambu-Goldstone bosons. We identify a new epsilon-regime at high baryon density in which the quark mass dependence of the partition function can be determined exactly. We also derive Leutwyler-Smilga-type spectral sum rules for the complex eigenvalues of the Dirac operator in terms of the fermion gap. Our results can in principle be tested in lattice QCD simulations. |
hep-ph/9609490 | Jean-Rene Cudell | J.R. Cudell and I. Royen (Liege U.) | Vector Meson Production at HERA | 12 pages, Latex, 6 figures. Shortened version of the previous paper,
which also includes a clearer criticism of the work by Martin, Ryskin and
Teubner, hep-ph/9609448 | Phys.Lett. B397 (1997) 317-324 | 10.1016/S0370-2693(97)00193-7 | ULG-PNT-96-2-JRC | hep-ph | null | We show that the lowest-order QCD calculation in a simple model of elastic
vector-meson production does reproduce correctly the ratios of cross sections
for rho, phi and J/psi, both in photoproduction and in high-Q2 quasi-elastic
scattering. The dependence of the slopes on the mass of the vector meson is
reproduced as well. We examine the lower-energy data, and find that the energy
dependence of the cross section does not depend on Q2, but may depend on the
vector-meson mass.
| [
{
"created": "Thu, 26 Sep 1996 16:11:25 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Feb 1997 12:16:17 GMT",
"version": "v2"
}
] | 2009-10-28 | [
[
"Cudell",
"J. R.",
"",
"Liege U."
],
[
"Royen",
"I.",
"",
"Liege U."
]
] | We show that the lowest-order QCD calculation in a simple model of elastic vector-meson production does reproduce correctly the ratios of cross sections for rho, phi and J/psi, both in photoproduction and in high-Q2 quasi-elastic scattering. The dependence of the slopes on the mass of the vector meson is reproduced as well. We examine the lower-energy data, and find that the energy dependence of the cross section does not depend on Q2, but may depend on the vector-meson mass. |
1902.08195 | Alexander Studenikin | Artem Popov and Alexander Studenikin | Neutrino eigenstates and flavour, spin and spin-flavour oscillations in
a constant magnetic field | 7 pages and 3 figures. arXiv admin note: text overlap with
arXiv:1803.05755 | Eur. Phys. J. C (2019) 79:144 | 10.1140/epjc/s10052-019-6657-z | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We further develop a recently proposed new approach to the description of the
relativistic neutrino flavour $\nu_e^L \leftrightarrow \nu_{\mu}^L$, spin
$\nu_e^L \leftrightarrow \nu_{e}^R$ and spin-flavour $\nu_e^L \leftrightarrow
\nu_{\mu}^R$ oscillations in a constant magnetic field that is based on the use
of the exact neutrino stationary states in the magnetic field. The neutrino
flavour, spin and spin-flavour oscillations probabilities are calculated
accounting for the whole set of possible conversions between four neutrino
states. In general, the obtained expressions for the neutrino oscillations
probabilities exhibit new inherent features in the oscillation patterns. It is
shown, in particular, that: 1) in the presence of the transversal magnetic
field for a given choice of parameters (the energy and magnetic moments of
neutrinos and the strength of the magnetic field) the amplitude of the flavour
oscillations $\nu_e^L \leftrightarrow \nu_{\mu}^L$ at the vacuum frequency is
modulated by the magnetic field frequency, 2) the neutrino spin oscillation
probability (without change of the neutrino flavour) exhibits the dependence on
the mass square difference $\Delta m^2$. It is shown that the discussed
interplay of neutrino oscillations in magnetic fields on different frequencies
can have important consequences in astrophysical environments, in particular in
those peculiar for magnetars.
| [
{
"created": "Thu, 21 Feb 2019 10:25:37 GMT",
"version": "v1"
}
] | 2019-03-27 | [
[
"Popov",
"Artem",
""
],
[
"Studenikin",
"Alexander",
""
]
] | We further develop a recently proposed new approach to the description of the relativistic neutrino flavour $\nu_e^L \leftrightarrow \nu_{\mu}^L$, spin $\nu_e^L \leftrightarrow \nu_{e}^R$ and spin-flavour $\nu_e^L \leftrightarrow \nu_{\mu}^R$ oscillations in a constant magnetic field that is based on the use of the exact neutrino stationary states in the magnetic field. The neutrino flavour, spin and spin-flavour oscillations probabilities are calculated accounting for the whole set of possible conversions between four neutrino states. In general, the obtained expressions for the neutrino oscillations probabilities exhibit new inherent features in the oscillation patterns. It is shown, in particular, that: 1) in the presence of the transversal magnetic field for a given choice of parameters (the energy and magnetic moments of neutrinos and the strength of the magnetic field) the amplitude of the flavour oscillations $\nu_e^L \leftrightarrow \nu_{\mu}^L$ at the vacuum frequency is modulated by the magnetic field frequency, 2) the neutrino spin oscillation probability (without change of the neutrino flavour) exhibits the dependence on the mass square difference $\Delta m^2$. It is shown that the discussed interplay of neutrino oscillations in magnetic fields on different frequencies can have important consequences in astrophysical environments, in particular in those peculiar for magnetars. |
1702.04399 | Salah Nasri | Meziane Chekkal, Amine Ahriche, Amine Bouziane Hammou, and Salah Nasri | Right-handed neutrinos: dark matter, lepton flavor violation and
leptonic collider searches | 21 pages, 17 figures & 4 tables, matches published version | Phys. Rev. D 95, 095025 (2017) | 10.1103/PhysRevD.95.095025 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine lepton flavor violating (LFV) interactions for heavy right-handed
neutrinos that exist in most of the standard model extensions that address dark
matter (DM) and neutrino mass at the loop level. In order to probe the collider
effect of these LFV interactions, we impose the assumption that the model
parameters give the right values of the DM relic density and fulfill the
constraints from the LFV processes $\ell_{\alpha}\rightarrow\ell_{\beta}\gamma$
and $\ell_{\alpha}\rightarrow3\ell_{\beta}$. We also investigate the
possibility of probing these interactions, and hence the right-handed neutrino,
at leptonic colliders through different final state signatures.
| [
{
"created": "Tue, 14 Feb 2017 21:36:10 GMT",
"version": "v1"
},
{
"created": "Fri, 19 May 2017 18:01:11 GMT",
"version": "v2"
}
] | 2017-06-07 | [
[
"Chekkal",
"Meziane",
""
],
[
"Ahriche",
"Amine",
""
],
[
"Hammou",
"Amine Bouziane",
""
],
[
"Nasri",
"Salah",
""
]
] | We examine lepton flavor violating (LFV) interactions for heavy right-handed neutrinos that exist in most of the standard model extensions that address dark matter (DM) and neutrino mass at the loop level. In order to probe the collider effect of these LFV interactions, we impose the assumption that the model parameters give the right values of the DM relic density and fulfill the constraints from the LFV processes $\ell_{\alpha}\rightarrow\ell_{\beta}\gamma$ and $\ell_{\alpha}\rightarrow3\ell_{\beta}$. We also investigate the possibility of probing these interactions, and hence the right-handed neutrino, at leptonic colliders through different final state signatures. |
hep-ph/9701397 | Jiri Horejsi | J. Horejsi and M. Schnabl | Dispersive derivation of the trace anomaly | 12 pages LATEX, minor changes in references | Z.Phys. C76 (1997) 561-565 | null | PRA - HEP 97/2 | hep-ph hep-th | null | We present a simple derivation of the one-loop trace anomaly in spinor QED
through dispersion relations, avoiding completely any ultraviolet
regularization. The anomaly can be expressed as a convergent sum rule for the
imaginary part of a relevant formfactor. In the massless limit, the imaginary
part produces a delta-function singularity at zero external momentum squared.
Such a treatment reveals an "infrared face" of the trace anomaly, in striking
similarity with the well-known case of the axial anomaly.
| [
{
"created": "Tue, 28 Jan 1997 14:13:59 GMT",
"version": "v1"
},
{
"created": "Fri, 31 Jan 1997 09:40:36 GMT",
"version": "v2"
}
] | 2008-02-03 | [
[
"Horejsi",
"J.",
""
],
[
"Schnabl",
"M.",
""
]
] | We present a simple derivation of the one-loop trace anomaly in spinor QED through dispersion relations, avoiding completely any ultraviolet regularization. The anomaly can be expressed as a convergent sum rule for the imaginary part of a relevant formfactor. In the massless limit, the imaginary part produces a delta-function singularity at zero external momentum squared. Such a treatment reveals an "infrared face" of the trace anomaly, in striking similarity with the well-known case of the axial anomaly. |
hep-ph/0206254 | Cristiano B. Mariotto | C. Brenner Mariotto, M.B. Gay Ducati (Rio Grande do Sul U.), G.
Ingelman (Uppsala U.) | Soft and hard QCD in charmonium production | Presented at Pan American Advanced Studies Institute (PASI 2002),
Campos do Jord\~ao, Brazil, January 7-18, 2002 | null | null | null | hep-ph | null | Hard and soft QCD dynamics are both important in charmonium hadroproduction,
as presented here through a next-to-leading order QCD matrix element
calculation combined with the colour evaporation model. Observed $x_F$ and
$p_\perp$ distributions of $J/\psi$ in hadroproduction are reproduced. Quite
similar results can also be obtained with a Monte Carlo event generator where
\ccbar pairs are instead produced through leading order matrix elements and the
parton shower approximation of higher order processes. The soft dynamics may
alternatively be described by the soft colour interaction model. We also
discuss the relative rates of different charmonium states and introduce an
improved model for mapping the continuous ccbar mass spectrum on the physical
charmonium resonances.
| [
{
"created": "Tue, 25 Jun 2002 17:42:32 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Mariotto",
"C. Brenner",
"",
"Rio Grande do Sul U."
],
[
"Ducati",
"M. B. Gay",
"",
"Rio Grande do Sul U."
],
[
"Ingelman",
"G.",
"",
"Uppsala U."
]
] | Hard and soft QCD dynamics are both important in charmonium hadroproduction, as presented here through a next-to-leading order QCD matrix element calculation combined with the colour evaporation model. Observed $x_F$ and $p_\perp$ distributions of $J/\psi$ in hadroproduction are reproduced. Quite similar results can also be obtained with a Monte Carlo event generator where \ccbar pairs are instead produced through leading order matrix elements and the parton shower approximation of higher order processes. The soft dynamics may alternatively be described by the soft colour interaction model. We also discuss the relative rates of different charmonium states and introduce an improved model for mapping the continuous ccbar mass spectrum on the physical charmonium resonances. |
hep-ph/9605283 | Mikko Laine | M.Laine | Effective Theories of MSSM at High Temperature | 42 pages, 8 figures. Erratum appended, conclusions unchanged | Nucl.Phys. B481 (1996) 43-84; Erratum-ibid. B548 (1999) 637-638 | 10.1016/S0550-3213(96)90121-2 | null | hep-ph | null | We construct effective 3d field theories for the Minimal Supersymmetric
Standard Model, relevant for the thermodynamics of the cosmological electroweak
phase transition. The effective theories include a 3d theory for the bosonic
sector of the original 4d theory; a 3d two Higgs doublet model; and a 3d
SU(2)+Higgs model. The integrations are made at 1-loop level. In integrals
related to vacuum renormalization we take into account only quarks and squarks
of the third generation. Using existing non-perturbative lattice results for
the 3d SU(2)+Higgs model, we then derive infrared safe upper bounds for the
lightest Higgs boson mass required for successful baryogenesis at the
electroweak scale. The Higgs mass bounds turn out to be close to those
previously found with the effective potential, allowing baryogenesis if the
right-handed stop mass parameter $m_U^2$ is small. Finally we discuss the
effective theory relevant for $m_U^2$ very small, the most favourable case for
baryogenesis.
| [
{
"created": "Mon, 13 May 1996 04:52:37 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Feb 1999 18:56:31 GMT",
"version": "v2"
}
] | 2015-06-25 | [
[
"Laine",
"M.",
""
]
] | We construct effective 3d field theories for the Minimal Supersymmetric Standard Model, relevant for the thermodynamics of the cosmological electroweak phase transition. The effective theories include a 3d theory for the bosonic sector of the original 4d theory; a 3d two Higgs doublet model; and a 3d SU(2)+Higgs model. The integrations are made at 1-loop level. In integrals related to vacuum renormalization we take into account only quarks and squarks of the third generation. Using existing non-perturbative lattice results for the 3d SU(2)+Higgs model, we then derive infrared safe upper bounds for the lightest Higgs boson mass required for successful baryogenesis at the electroweak scale. The Higgs mass bounds turn out to be close to those previously found with the effective potential, allowing baryogenesis if the right-handed stop mass parameter $m_U^2$ is small. Finally we discuss the effective theory relevant for $m_U^2$ very small, the most favourable case for baryogenesis. |
1109.1536 | Pietro Falgari | M. Beneke (RWTH Aachen U.), P. Falgari (Utrecht U.), S. Klein (RWTH
Aachen U.), C. Schwinn (Freiburg U.) | Hadronic top-quark pair production with NNLL threshold resummation | 55 pages, LaTeX, 13 figures | Nucl. Phys. B855:695-741, 2012 | 10.1016/j.nuclphysb.2011.10.021 | TTK-11-38, ITP-UU-11/26, SPIN-11/19, FR-PHENO-2011-015,
SFB/CPP-11-49 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute the total top-quark pair production cross section at the Tevatron
and LHC based on approximate NNLO results, and on the summation of threshold
logarithms and Coulomb enhancements to all orders with next-to-next-to-leading
logarithmic (NNLL) accuracy, including bound-state effects. We find
\sigma_{t\bar t} = 7.22^{+0.31+0.71}_{-0.47-0.55} pb at Tevatron and
\sigma_{t\bar t} = 162.6^{+7.4+15.4}_{-7.6-14.7} pb at LHC with 7 TeV c.o.m.
energy, for m_t=173.3 GeV. The implementation of joint soft and Coulomb
resummation, its ambiguities, and the present theoretical uncertainty are
discussed in detail. We further obtain new approximate results at N3LO.
| [
{
"created": "Wed, 7 Sep 2011 18:55:18 GMT",
"version": "v1"
}
] | 2011-11-14 | [
[
"Beneke",
"M.",
"",
"RWTH Aachen U."
],
[
"Falgari",
"P.",
"",
"Utrecht U."
],
[
"Klein",
"S.",
"",
"RWTH\n Aachen U."
],
[
"Schwinn",
"C.",
"",
"Freiburg U."
]
] | We compute the total top-quark pair production cross section at the Tevatron and LHC based on approximate NNLO results, and on the summation of threshold logarithms and Coulomb enhancements to all orders with next-to-next-to-leading logarithmic (NNLL) accuracy, including bound-state effects. We find \sigma_{t\bar t} = 7.22^{+0.31+0.71}_{-0.47-0.55} pb at Tevatron and \sigma_{t\bar t} = 162.6^{+7.4+15.4}_{-7.6-14.7} pb at LHC with 7 TeV c.o.m. energy, for m_t=173.3 GeV. The implementation of joint soft and Coulomb resummation, its ambiguities, and the present theoretical uncertainty are discussed in detail. We further obtain new approximate results at N3LO. |
hep-ph/0106348 | Yuri Dokshitzer | Yuri L. Dokshitzer | QCD and Hadron Dynamics | Talk at the Royal Society meeting "Structure of Matter", London, May
2000 | Phil.Trans.Roy.Soc.Lond. A359 (2001) 309-324 | 10.1098/rsta.2000.0728 | LPT-Orsay-00/89, August 2000 | hep-ph | null | Perturbative QCD predicts and describes various features of multihadron
production. An amazing similarity between observable hadron systems and
calculable underlying parton ensembles justifies the attempts to use the
language of quarks and gluons down to small momentum scales, to approach the
profound problems that are commonly viewed as being entirely non-perturbative.
| [
{
"created": "Fri, 29 Jun 2001 12:52:03 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Dokshitzer",
"Yuri L.",
""
]
] | Perturbative QCD predicts and describes various features of multihadron production. An amazing similarity between observable hadron systems and calculable underlying parton ensembles justifies the attempts to use the language of quarks and gluons down to small momentum scales, to approach the profound problems that are commonly viewed as being entirely non-perturbative. |
1308.3638 | Boris Kopeliovich | B. Z. Kopeliovich, H. J. Pirner, I. K. Potashnikova, K. Reygers and
Ivan Schmidt | J/Psi in high-multiplicity pp collisions: lessons from pA | 6 pages, 4 figures | Phys. Rev. D 88, 116002 (2013) | 10.1103/PhysRevD.88.116002 | USM-TH-314 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gluons at small x in high-energy nuclei overlap in the longitudinal
direction, so the nucleus acts as a single source of gluons, like higher Fock
components in a single nucleon, which contribute to inelastic collisions with a
high multiplicity of produced hadrons. This similarity helps to make a link
between nuclear effects in pA and high-multiplicity pp collisions. Such a
relation is well confirmed by data for the J/Psi production rate in
high-multiplicity pp events measured recently in the ALICE experiment.
Broadening of J/Psi transverse momentum is predicted for high-multiplicity pp
collisions.
| [
{
"created": "Fri, 16 Aug 2013 14:27:45 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Aug 2013 20:45:36 GMT",
"version": "v2"
}
] | 2013-12-16 | [
[
"Kopeliovich",
"B. Z.",
""
],
[
"Pirner",
"H. J.",
""
],
[
"Potashnikova",
"I. K.",
""
],
[
"Reygers",
"K.",
""
],
[
"Schmidt",
"Ivan",
""
]
] | Gluons at small x in high-energy nuclei overlap in the longitudinal direction, so the nucleus acts as a single source of gluons, like higher Fock components in a single nucleon, which contribute to inelastic collisions with a high multiplicity of produced hadrons. This similarity helps to make a link between nuclear effects in pA and high-multiplicity pp collisions. Such a relation is well confirmed by data for the J/Psi production rate in high-multiplicity pp events measured recently in the ALICE experiment. Broadening of J/Psi transverse momentum is predicted for high-multiplicity pp collisions. |
hep-ph/9809467 | Steven Abel | Steven Abel and Stephen King | On fixed points and fermion mass structure from large extra dimensions | 17 Pages plain latex; includes 3 postscript figures | Phys.Rev.D59:095010,1999 | 10.1103/PhysRevD.59.095010 | CERN-TH 98/311 | hep-ph | null | We examine the fixed point behaviour of Yukawa couplings in supersymmetric
theories with varying numbers of dimensions. We show that Pendleton-Ross fixed
point behaviour is greatly amplified in the MSSM with no extra dimensions and 4
extra $5+\bar{5}$ multiplets or the MSSM with one extra large dimension and 3
extra $5+\bar{5}$ multiplets. We also show that power law running in models
with large extra dimensions can give a hierarchical set of quasi-fixed points
for the Yukawa couplings in a manner which is similar to the Froggatt-Nielsen
mechanism. However, we also point out the limited perturbative domain in models
with power law running
| [
{
"created": "Mon, 21 Sep 1998 15:10:48 GMT",
"version": "v1"
}
] | 2011-01-13 | [
[
"Abel",
"Steven",
""
],
[
"King",
"Stephen",
""
]
] | We examine the fixed point behaviour of Yukawa couplings in supersymmetric theories with varying numbers of dimensions. We show that Pendleton-Ross fixed point behaviour is greatly amplified in the MSSM with no extra dimensions and 4 extra $5+\bar{5}$ multiplets or the MSSM with one extra large dimension and 3 extra $5+\bar{5}$ multiplets. We also show that power law running in models with large extra dimensions can give a hierarchical set of quasi-fixed points for the Yukawa couplings in a manner which is similar to the Froggatt-Nielsen mechanism. However, we also point out the limited perturbative domain in models with power law running |
hep-ph/0302011 | Carlo Ewerz | Carlo Ewerz | Gribov's Light Quark Confinement Scenario | 3 pages, Talk presented at 5th Int. Conference on Quark Confinement
and the Hadron Spectrum, Gargnano, Italy, Sep. 2002 | null | 10.1142/9789812704269_0046 | HD-THEP-03-03 | hep-ph | null | I give a brief description of Gribov's light quark confinement scenario and
of the Gribov--Dyson--Schwinger equation for light quarks. It is shown that the
Green function obtained from this equation exhibits chiral symmetry breaking.
| [
{
"created": "Mon, 3 Feb 2003 18:28:38 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Ewerz",
"Carlo",
""
]
] | I give a brief description of Gribov's light quark confinement scenario and of the Gribov--Dyson--Schwinger equation for light quarks. It is shown that the Green function obtained from this equation exhibits chiral symmetry breaking. |
hep-ph/0011074 | Carlo Giunti | C. Giunti, C.W. Kim | Quantum Mechanics of Neutrino Oscillations | 13 pages, no figures | Found.Phys.Lett. 14 (2001) 213-229 | null | KIAS-P00070 | hep-ph astro-ph hep-ex | null | We present a simple but general treatment of neutrino oscillations in the
framework of quantum mechanics using plane waves and intuitive wave packet
principles when necessary. We attempt to clarify some confusing statements that
have recently appeared in the literature.
| [
{
"created": "Mon, 6 Nov 2000 13:32:49 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Giunti",
"C.",
""
],
[
"Kim",
"C. W.",
""
]
] | We present a simple but general treatment of neutrino oscillations in the framework of quantum mechanics using plane waves and intuitive wave packet principles when necessary. We attempt to clarify some confusing statements that have recently appeared in the literature. |
2211.05553 | Gilson Dallabona Dr. | G. Dallabona and O. A. Battistel | Analytic results for the massive sunrise integral in the context of an
alternative perturbative calculational method | null | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An explicit investigation about the equal-mass two-loop sunrise Feynman graph
is performed. Such perturbative amplitude is related with many important
physical process treated in the standard model context. The background of this
investigation is an alternative strategy to handle with the divergences typical
of perturbative solutions of quantum field theory. Since its proposition, the
mentioned method was exhaustively used to calculate and manipulate one-loop
Feynman integrals with a great success. However, the great advances in
precision of experimental data collected in particle physics colliders have
pushed up theoretical physicists to improve their predictions through
multi-loops calculations. In the present job, we describe the main steps
required to perform two-loops calculations within the context of the referred
method. We show that the same rules used for one-loop calculations are enough
to deal with two-loops graphs as well. Analytic results for the sunrise graph
are obtained in terms of elliptic multiple polylogarithms as well as a
numerical analysis is provided.
| [
{
"created": "Thu, 10 Nov 2022 13:20:44 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Nov 2022 19:05:11 GMT",
"version": "v2"
}
] | 2022-11-15 | [
[
"Dallabona",
"G.",
""
],
[
"Battistel",
"O. A.",
""
]
] | An explicit investigation about the equal-mass two-loop sunrise Feynman graph is performed. Such perturbative amplitude is related with many important physical process treated in the standard model context. The background of this investigation is an alternative strategy to handle with the divergences typical of perturbative solutions of quantum field theory. Since its proposition, the mentioned method was exhaustively used to calculate and manipulate one-loop Feynman integrals with a great success. However, the great advances in precision of experimental data collected in particle physics colliders have pushed up theoretical physicists to improve their predictions through multi-loops calculations. In the present job, we describe the main steps required to perform two-loops calculations within the context of the referred method. We show that the same rules used for one-loop calculations are enough to deal with two-loops graphs as well. Analytic results for the sunrise graph are obtained in terms of elliptic multiple polylogarithms as well as a numerical analysis is provided. |
hep-ph/9607344 | Kaloshin Alexander | A.E.Kaloshin | Effect of the unitary mixing scalar--vector | 14 pages | Phys.Atom.Nucl. 60 (1997) 1179-1185; Yad.Fiz. 60N7 (1997)
1306-1312 | null | ISU-IAP.Th96-05, Irkutsk | hep-ph | null | We consider the procedure of dressing of scalar and vector particles when
there exists the off--diagonal loop connecting vector and scalar propagators.
Instead of single Dyson equations for scalar and vector, we have in this case a
system of three equations for coupled full propagators. Using the $\pi-a_1$
system as an example, we discuss the physical meaning of this effect and the
renormalization procedure for coupled propagators. The considered effect of the
unitary S~--~V mixing may exits also in the "Higgs boson~--~Z~(~W~)" system for
extended electroweak models.
| [
{
"created": "Mon, 17 Jun 1996 22:47:43 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Kaloshin",
"A. E.",
""
]
] | We consider the procedure of dressing of scalar and vector particles when there exists the off--diagonal loop connecting vector and scalar propagators. Instead of single Dyson equations for scalar and vector, we have in this case a system of three equations for coupled full propagators. Using the $\pi-a_1$ system as an example, we discuss the physical meaning of this effect and the renormalization procedure for coupled propagators. The considered effect of the unitary S~--~V mixing may exits also in the "Higgs boson~--~Z~(~W~)" system for extended electroweak models. |
hep-ph/0211465 | Zhi-zhong Xing | Zhi-zhong Xing | Wolfenstein-like Parametrization of the Neutrino Mixing Matrix | RevTex 9 pages. Some changes made and more discussions added | J.Phys.G29:2227-2234,2003 | 10.1088/0954-3899/29/9/316 | BIHEP-TH-2002-58 | hep-ph | null | We show that the $3\times 3$ lepton flavor mixing matrix $V$ can be expanded
in powers of a Wolfenstein-like parameter $\Lambda \equiv |V_{\mu 3}| \sim
1/\sqrt{2}$, which measures the strength of flavor conversion in atmospheric
neutrino oscillations. The term of ${\cal O}(\Lambda^2)$ is associated with the
large mixing angle in solar neutrino oscillations. The Dirac phase of CP
violation enters at or below ${\cal O}(\Lambda^8)$, and the Majorana phases of
CP violation are not subject to the $\Lambda$-expansion. Terrestrial matter
effects on this new parametrization in realistic long-baseline neutrino
oscillation experiments are briefly discussed. Some comments are also given on
the possible relation between $\Lambda$ and a relatively weak hierarchy of
neutrino masses.
| [
{
"created": "Fri, 29 Nov 2002 17:11:38 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Dec 2002 17:13:52 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Xing",
"Zhi-zhong",
""
]
] | We show that the $3\times 3$ lepton flavor mixing matrix $V$ can be expanded in powers of a Wolfenstein-like parameter $\Lambda \equiv |V_{\mu 3}| \sim 1/\sqrt{2}$, which measures the strength of flavor conversion in atmospheric neutrino oscillations. The term of ${\cal O}(\Lambda^2)$ is associated with the large mixing angle in solar neutrino oscillations. The Dirac phase of CP violation enters at or below ${\cal O}(\Lambda^8)$, and the Majorana phases of CP violation are not subject to the $\Lambda$-expansion. Terrestrial matter effects on this new parametrization in realistic long-baseline neutrino oscillation experiments are briefly discussed. Some comments are also given on the possible relation between $\Lambda$ and a relatively weak hierarchy of neutrino masses. |
1305.2842 | Van Mayes | Van E. Mayes | Universal Soft Terms in the MSSM on D-branes | Version published in Nuclear Physics B | Nucl. Phys. B 877 (2013) 401-418 | 10.1016/j.nuclphysb.2013.10.016 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In Type II string vacua constructed from intersecting/magnetized D-branes,
the supersymmetry-breaking soft terms are genericaly non-universal. It is shown
that universal supersymmetry-breaking soft terms may arise in a realistic MSSM
constructed from intersecting/magnetized D-branes in Type II string theory. For
the case of dilaton-dominated supersymmetry-breaking, it is shown that the
universal scalar mass and trilinear coupling are fixed such that
$m_0=(1/2)m_{3/2}$ and $A_0 = - m_{1/2}$. In addition, soft terms where the
universal scalar mass $m_0$ is much larger than the universal gaugino mass
$m_{1/2}$ may be easily obtained within the model, corresponding to the Focus
Point (FP)/Hyperbolic Branch (HB) regions of the mSUGRA/CMSSM parameter space.
Finally, it is shown that the special dilaton and no-scale strict moduli
boundary conditions, which are well-known in heterotic string constructions,
may also be obtained.
| [
{
"created": "Mon, 13 May 2013 16:44:40 GMT",
"version": "v1"
},
{
"created": "Wed, 22 May 2013 19:04:47 GMT",
"version": "v2"
},
{
"created": "Tue, 20 Aug 2013 19:21:10 GMT",
"version": "v3"
},
{
"created": "Fri, 18 Oct 2013 17:02:48 GMT",
"version": "v4"
}
] | 2013-11-07 | [
[
"Mayes",
"Van E.",
""
]
] | In Type II string vacua constructed from intersecting/magnetized D-branes, the supersymmetry-breaking soft terms are genericaly non-universal. It is shown that universal supersymmetry-breaking soft terms may arise in a realistic MSSM constructed from intersecting/magnetized D-branes in Type II string theory. For the case of dilaton-dominated supersymmetry-breaking, it is shown that the universal scalar mass and trilinear coupling are fixed such that $m_0=(1/2)m_{3/2}$ and $A_0 = - m_{1/2}$. In addition, soft terms where the universal scalar mass $m_0$ is much larger than the universal gaugino mass $m_{1/2}$ may be easily obtained within the model, corresponding to the Focus Point (FP)/Hyperbolic Branch (HB) regions of the mSUGRA/CMSSM parameter space. Finally, it is shown that the special dilaton and no-scale strict moduli boundary conditions, which are well-known in heterotic string constructions, may also be obtained. |
0801.3656 | Christopher Savage | John Ellis, Keith A. Olive, Christopher Savage | Hadronic Uncertainties in the Elastic Scattering of Supersymmetric Dark
Matter | 25 pages, 10 figures. v2: added references. To appear in PRD | Phys.Rev.D77:065026,2008 | 10.1103/PhysRevD.77.065026 | CERN-PH-TH/2008-005, UMN-TH-2631/08, FTPI-MINN-08/02 | hep-ph astro-ph nucl-ex nucl-th | null | We review the uncertainties in the spin-independent and -dependent elastic
scattering cross sections of supersymmetric dark matter particles on protons
and neutrons. We propagate the uncertainties in quark masses and hadronic
matrix elements that are related to the $\pi$-nucleon $\sigma$ term and the
spin content of the nucleon. By far the largest single uncertainty is that in
spin-independent scattering induced by our ignorance of the $<N | {\bar q} q |
N>$ matrix elements linked to the $\pi$-nucleon $\sigma$ term, which affects
the ratio of cross sections on proton and neutron targets as well as their
absolute values. This uncertainty is already impacting the interpretations of
experimental searches for cold dark matter. {\it We plead for an experimental
campaign to determine better the $\pi$-nucleon $\sigma$ term.} Uncertainties in
the spin content of the proton affect significantly, but less strongly, the
calculation of rates used in indirect searches.
| [
{
"created": "Wed, 23 Jan 2008 20:31:48 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Feb 2008 15:02:20 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Ellis",
"John",
""
],
[
"Olive",
"Keith A.",
""
],
[
"Savage",
"Christopher",
""
]
] | We review the uncertainties in the spin-independent and -dependent elastic scattering cross sections of supersymmetric dark matter particles on protons and neutrons. We propagate the uncertainties in quark masses and hadronic matrix elements that are related to the $\pi$-nucleon $\sigma$ term and the spin content of the nucleon. By far the largest single uncertainty is that in spin-independent scattering induced by our ignorance of the $<N | {\bar q} q | N>$ matrix elements linked to the $\pi$-nucleon $\sigma$ term, which affects the ratio of cross sections on proton and neutron targets as well as their absolute values. This uncertainty is already impacting the interpretations of experimental searches for cold dark matter. {\it We plead for an experimental campaign to determine better the $\pi$-nucleon $\sigma$ term.} Uncertainties in the spin content of the proton affect significantly, but less strongly, the calculation of rates used in indirect searches. |
1611.02539 | Miguel Angel Lopez-Ruiz | Miguel Angel Lopez-Ruiz, Yin Jiang, Jinfeng Liao | Confinement, Holonomy and Correlated Instanton-Dyon Ensemble I: SU(2)
Yang-Mills Theory | null | Phys. Rev. D 97, 054026 (2018) | 10.1103/PhysRevD.97.054026 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The mechanism of confinement in Yang-Mills theories remains a challenge to
our understanding of nonperturbative gauge dynamics. While it is widely
perceived that confinement may arise from chromo-magnetically charged gauge
configurations with nontrivial topology, it is not clear what types of
configurations could do that and how, in pure Yang-Mills and QCD-like
(non-supersymmetric) theories. Recently a promising approach has emerged, based
on statistical ensembles of dyons/anti-dyons that are constituents of
instanton/anti-instanton solutions with nontrivial holonomy where the holonomy
plays a vital role as an effective "Higgsing" mechanism. We report a thorough
numerical investigation of the confinement dynamics in SU(2) Yang-Mills theory
by constructing such a statistical ensemble of correlated instanton-dyons.
| [
{
"created": "Tue, 8 Nov 2016 14:48:28 GMT",
"version": "v1"
},
{
"created": "Sun, 17 Sep 2017 21:19:33 GMT",
"version": "v2"
},
{
"created": "Mon, 5 Mar 2018 23:11:25 GMT",
"version": "v3"
}
] | 2018-03-28 | [
[
"Lopez-Ruiz",
"Miguel Angel",
""
],
[
"Jiang",
"Yin",
""
],
[
"Liao",
"Jinfeng",
""
]
] | The mechanism of confinement in Yang-Mills theories remains a challenge to our understanding of nonperturbative gauge dynamics. While it is widely perceived that confinement may arise from chromo-magnetically charged gauge configurations with nontrivial topology, it is not clear what types of configurations could do that and how, in pure Yang-Mills and QCD-like (non-supersymmetric) theories. Recently a promising approach has emerged, based on statistical ensembles of dyons/anti-dyons that are constituents of instanton/anti-instanton solutions with nontrivial holonomy where the holonomy plays a vital role as an effective "Higgsing" mechanism. We report a thorough numerical investigation of the confinement dynamics in SU(2) Yang-Mills theory by constructing such a statistical ensemble of correlated instanton-dyons. |
hep-ph/9910212 | Fred Myhrer | F. Myhrer | Exclusive Hadronic Reactions at High $Q^2$ | 8 pages, 4figs.; Talk at the TJNAF workshop on the Transition from
Low to High Q Form Factors, "Brodskyfest", Athens, GA, Sept 17, 1999 | null | null | null | hep-ph nucl-th | null | The observed scaling laws for large angle exclusive hadronic reactions are
successfully accounted for by the short-distance QCD quark interchange
processes. We focus on three hadronic reactions which shows evidence for a
slight oscillatory deviation from the expected scaling behaviour. Possible
explanations for these oscillations and connections to spin observables will be
mentioned. Better data from excisting facilities (or a possible future KEK
proton accelerator, JHP) can clarify the theoretical situation.
| [
{
"created": "Mon, 4 Oct 1999 13:45:41 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Myhrer",
"F.",
""
]
] | The observed scaling laws for large angle exclusive hadronic reactions are successfully accounted for by the short-distance QCD quark interchange processes. We focus on three hadronic reactions which shows evidence for a slight oscillatory deviation from the expected scaling behaviour. Possible explanations for these oscillations and connections to spin observables will be mentioned. Better data from excisting facilities (or a possible future KEK proton accelerator, JHP) can clarify the theoretical situation. |
hep-ph/0412337 | Colin David Froggatt | C.D. Froggatt | The Hierarchy Problem and an Exotic Bound State | 12 pages, 2 figures, to be published in the Proceedings of the 10th
International Symposium on Particles, Strings and Cosmology (PASCOS04),
Boston, 16-22 August 2004 | null | 10.1142/9789812701756_0041 | GUTPA/04/12/02 | hep-ph | null | The Multiple Point Principle, according to which there exist many vacuum
states with the same energy density, is put forward as a fine-tuning mechanism.
By assuming the existence of three degenerate vacua, we derive the hierarchical
ratio between the fundamental (Planck) and electroweak scales in the Standard
Model. In one of these phases, 6 top quarks and 6 anti-top quarks bind so
strongly by Higgs exchange as to become tachyonic and form a condensate. The
third degenerate vacuum is taken to have a Higgs field expectation value of the
order of the fundamental scale.
| [
{
"created": "Wed, 22 Dec 2004 14:06:43 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Froggatt",
"C. D.",
""
]
] | The Multiple Point Principle, according to which there exist many vacuum states with the same energy density, is put forward as a fine-tuning mechanism. By assuming the existence of three degenerate vacua, we derive the hierarchical ratio between the fundamental (Planck) and electroweak scales in the Standard Model. In one of these phases, 6 top quarks and 6 anti-top quarks bind so strongly by Higgs exchange as to become tachyonic and form a condensate. The third degenerate vacuum is taken to have a Higgs field expectation value of the order of the fundamental scale. |
1103.3618 | M.I. Vyazovsky | M.A. Braun (1), L.N. Lipatov (1 and 2), M.Yu. Salykin (1) and M.I.
Vyazovsky (1) ((1) Saint-Petersburg State University, Russia, (2)
Saint-Petersburg Nuclear Physics Institute, Russia) | Gluon production on two centers and the effective action approach | 15 pages, 7 figures; some misprints corrected; submitted to
Eur.Phys.Jour. C | null | 10.1140/epjc/s10052-011-1639-9 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Application of the effective action formalism is studied for processes in
which the reggeons may split. It is shown that the gluon production on two
centers is described by the contribution of the
Reggeon-to-two-Reggeons-plus-Particle vertex supplemented by certain singular
contributions from the double gluon exchange. The rules for longitudinal
integrations are established from the comparison to perturbative QCD amplitude.
Convenient expressions for application to the inclusive gluon production are
derived.
| [
{
"created": "Fri, 18 Mar 2011 13:21:29 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Apr 2011 06:13:40 GMT",
"version": "v2"
}
] | 2015-05-27 | [
[
"Braun",
"M. A.",
"",
"1 and 2"
],
[
"Lipatov",
"L. N.",
"",
"1 and 2"
],
[
"Salykin",
"M. Yu.",
""
],
[
"Vyazovsky",
"M. I.",
""
]
] | Application of the effective action formalism is studied for processes in which the reggeons may split. It is shown that the gluon production on two centers is described by the contribution of the Reggeon-to-two-Reggeons-plus-Particle vertex supplemented by certain singular contributions from the double gluon exchange. The rules for longitudinal integrations are established from the comparison to perturbative QCD amplitude. Convenient expressions for application to the inclusive gluon production are derived. |
1011.5758 | Nicolas Matagne SE | N. Matagne and Fl. Stancu | New look at the $[{\bf 70},1^-]$ nonstrange and strange baryons in the
$1/N_c$ expansion | 3 pages, 2 tables, talk given by N. Matagne at the conference "Quark
Confinement and the Hadron Spectrum IX", Madrid, Spain, 30th of August-3rd of
September 2010; submitted to the AIP proceedings | AIP Conf.Proc.1343:311-313,2011 | 10.1063/1.3575013 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The masses of excited nonstrange and strange baryons belonging to the
multiplet $[{\bf 70},1^-]$ are calculated in the $1/N_c$ expansion to order
$1/N_c$ with a new method which allows to considerably reduce the number of
linearly independent operators entering the mass formula. This study represents
an extension to SU(6) of our work on nonstrange baryons, the framework of which
was SU(4).
| [
{
"created": "Fri, 26 Nov 2010 11:00:50 GMT",
"version": "v1"
}
] | 2011-08-04 | [
[
"Matagne",
"N.",
""
],
[
"Stancu",
"Fl.",
""
]
] | The masses of excited nonstrange and strange baryons belonging to the multiplet $[{\bf 70},1^-]$ are calculated in the $1/N_c$ expansion to order $1/N_c$ with a new method which allows to considerably reduce the number of linearly independent operators entering the mass formula. This study represents an extension to SU(6) of our work on nonstrange baryons, the framework of which was SU(4). |
hep-ph/0506313 | Heather E. Logan | Tao Han, Heather E. Logan, and Lian-Tao Wang | Smoking-gun signatures of little Higgs models | 59 pages, 10 figures. v2: refs added, typos fixed, JHEP version | JHEP0601:099,2006 | 10.1088/1126-6708/2006/01/099 | MADPH-04-1409 | hep-ph | null | Little Higgs models predict new gauge bosons, fermions and scalars at the TeV
scale that stabilize the Higgs mass against quadratically divergent one-loop
radiative corrections. We categorize the many little Higgs models into two
classes based on the structure of the extended electroweak gauge group and
examine the experimental signatures that identify the little Higgs mechanism in
addition to those that identify the particular little Higgs model. We find that
by examining the properties of the new heavy fermion(s) at the LHC, one can
distinguish the structure of the top quark mass generation mechanism and test
the little Higgs mechanism in the top sector. Similarly, by studying the
couplings of the new gauge bosons to the light Higgs boson and to the Standard
Model fermions, one can confirm the little Higgs mechanism and determine the
structure of the extended electroweak gauge group.
| [
{
"created": "Wed, 29 Jun 2005 21:46:13 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Jan 2006 16:58:24 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Han",
"Tao",
""
],
[
"Logan",
"Heather E.",
""
],
[
"Wang",
"Lian-Tao",
""
]
] | Little Higgs models predict new gauge bosons, fermions and scalars at the TeV scale that stabilize the Higgs mass against quadratically divergent one-loop radiative corrections. We categorize the many little Higgs models into two classes based on the structure of the extended electroweak gauge group and examine the experimental signatures that identify the little Higgs mechanism in addition to those that identify the particular little Higgs model. We find that by examining the properties of the new heavy fermion(s) at the LHC, one can distinguish the structure of the top quark mass generation mechanism and test the little Higgs mechanism in the top sector. Similarly, by studying the couplings of the new gauge bosons to the light Higgs boson and to the Standard Model fermions, one can confirm the little Higgs mechanism and determine the structure of the extended electroweak gauge group. |
hep-ph/0511157 | Shun Zhou | Sin Kyu Kang, Zhi-zhong Xing and Shun Zhou | Possible Deviation from the Tri-bimaximal Neutrino Mixing in a Seesaw
Model | RevTex 12 pages (2 EPS figures included). More discussions and
references added | Phys.Rev. D73 (2006) 013001 | 10.1103/PhysRevD.73.013001 | null | hep-ph | null | We propose a simple but suggestive seesaw model with two phenomenological
conjectures: three heavy (right-handed) Majorana neutrinos are degenerate in
mass in the symmetry limit and three light Majorana neutrinos have the
tri-bimaximal mixing pattern $V^{}_0$. We show that a small mass splitting
between the first generation and the other two generations of heavy Majorana
neutrinos is responsible for the deviation of the solar neutrino mixing angle
$\theta^{}_{12}$ from its initial value $35.3^\circ$ given by $V^{}_0$, and the
slight breaking of the mass degeneracy between the second and third generations
of heavy Majorana neutrinos results in a small mixing angle $\theta^{}_{13}$
and a tiny departure of the atmospheric neutrino mixing angle $\theta^{}_{23}$
from $45^\circ$. It turns out that a normal hierarchy of the light neutrino
mass spectrum is favored in this seesaw scenario.
| [
{
"created": "Sun, 13 Nov 2005 04:57:51 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Dec 2005 07:51:29 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Kang",
"Sin Kyu",
""
],
[
"Xing",
"Zhi-zhong",
""
],
[
"Zhou",
"Shun",
""
]
] | We propose a simple but suggestive seesaw model with two phenomenological conjectures: three heavy (right-handed) Majorana neutrinos are degenerate in mass in the symmetry limit and three light Majorana neutrinos have the tri-bimaximal mixing pattern $V^{}_0$. We show that a small mass splitting between the first generation and the other two generations of heavy Majorana neutrinos is responsible for the deviation of the solar neutrino mixing angle $\theta^{}_{12}$ from its initial value $35.3^\circ$ given by $V^{}_0$, and the slight breaking of the mass degeneracy between the second and third generations of heavy Majorana neutrinos results in a small mixing angle $\theta^{}_{13}$ and a tiny departure of the atmospheric neutrino mixing angle $\theta^{}_{23}$ from $45^\circ$. It turns out that a normal hierarchy of the light neutrino mass spectrum is favored in this seesaw scenario. |
1901.02898 | Matthias Steinhauser | Roman N. Lee, Alexander V. Smirnov, Vladimir A. Smirnov, Matthias
Steinhauser | Four-loop quark form factor with quartic fundamental colour factor | 16 pages, 2 figures | null | 10.1007/JHEP02(2019)172 | TTP19-001 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analytically compute the four-loop QCD corrections for the colour
structure $(d_F^{abcd})^2$ to the massless non-singlet quark form factor. The
computation involves non-trivial non-planar integral families which have master
integrals in the top sector. We compute the master integrals by introducing a
second mass scale and solving differential equations with respect to the ratio
of the two scales. We present details of our calculational procedure.
Analytical results for the cusp and collinear anomalous dimensions, and the
finite part of the form factor are presented. We also provide analytic results
for all master integrals expanded up to weight eight.
| [
{
"created": "Wed, 9 Jan 2019 19:00:10 GMT",
"version": "v1"
}
] | 2019-03-27 | [
[
"Lee",
"Roman N.",
""
],
[
"Smirnov",
"Alexander V.",
""
],
[
"Smirnov",
"Vladimir A.",
""
],
[
"Steinhauser",
"Matthias",
""
]
] | We analytically compute the four-loop QCD corrections for the colour structure $(d_F^{abcd})^2$ to the massless non-singlet quark form factor. The computation involves non-trivial non-planar integral families which have master integrals in the top sector. We compute the master integrals by introducing a second mass scale and solving differential equations with respect to the ratio of the two scales. We present details of our calculational procedure. Analytical results for the cusp and collinear anomalous dimensions, and the finite part of the form factor are presented. We also provide analytic results for all master integrals expanded up to weight eight. |
1211.7173 | Shin Muroya | Shin Muroya and Masashi Mizutani | On the Coefficients of a Hyperbolic Hydrodynamic Model | 14 pages, no figure | null | null | null | hep-ph cond-mat.stat-mech nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Based on the Nakajima-Zubarev type nonequilibrium density operator, we derive
a hyperbolic hydrodynamical equation. Microscopic Kubo-formulas for all
coefficients in the hyperbolic hydrodynamics are obtained. Coefficients
$\alpha_{i}$'s and $\beta_{i}$'s in the Israel-Stewart equation are given as
current-weighted correlation lengths which are to be calculated in statistical
mechanics.
| [
{
"created": "Fri, 30 Nov 2012 07:49:26 GMT",
"version": "v1"
}
] | 2012-12-03 | [
[
"Muroya",
"Shin",
""
],
[
"Mizutani",
"Masashi",
""
]
] | Based on the Nakajima-Zubarev type nonequilibrium density operator, we derive a hyperbolic hydrodynamical equation. Microscopic Kubo-formulas for all coefficients in the hyperbolic hydrodynamics are obtained. Coefficients $\alpha_{i}$'s and $\beta_{i}$'s in the Israel-Stewart equation are given as current-weighted correlation lengths which are to be calculated in statistical mechanics. |
hep-ph/0601044 | Yu-Ping Kuang | Yu-Ping Kuang | QCD Multipole Expansion and Hadronic Transitions in Heavy Quarkonium
Systems | 23 pages, 7 figures. Some typos corrected, and 3 references added | Front.Phys.China1:19-37,2006 | 10.1007/s11467-005-0012-6 | TUHEP-TH-05151 | hep-ph | null | We review the developments of QCD multipole expansion and its applications to
hadronic transitions and some radiative decays of heavy quarkonia. Theoretical
predictions are compsred with updated experimental results.
| [
{
"created": "Fri, 6 Jan 2006 10:55:38 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Jan 2006 11:49:12 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Kuang",
"Yu-Ping",
""
]
] | We review the developments of QCD multipole expansion and its applications to hadronic transitions and some radiative decays of heavy quarkonia. Theoretical predictions are compsred with updated experimental results. |
hep-ph/0203014 | Gorazd Cvetic | Igor Kondrashuk, Gorazd Cvetic, and Ivan Schmidt | An approach to solve Slavnov-Taylor identities in nonsupersymmetric
non-Abelian gauge theories | revised version, section 3 is enlarged, 24 pages, Latex2e, no
figures, version accepted by Phys. Rev. D | Phys.Rev. D67 (2003) 065006 | 10.1103/PhysRevD.67.065006 | USM-TH-122 | hep-ph hep-th | null | We present a way to solve Slavnov--Taylor identities in a general
nonsupersymmetric theory. The solution can be parametrized by a limited number
of functions of spacetime coordinates, so that all the effective fields are
dressed by these functions via integral convolution. The solution restricts the
ghost part of the effective action and gives predictions for the physical part
of the effective action.
| [
{
"created": "Mon, 4 Mar 2002 18:00:23 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Oct 2002 18:08:06 GMT",
"version": "v2"
},
{
"created": "Sun, 29 Dec 2002 00:04:38 GMT",
"version": "v3"
}
] | 2009-11-07 | [
[
"Kondrashuk",
"Igor",
""
],
[
"Cvetic",
"Gorazd",
""
],
[
"Schmidt",
"Ivan",
""
]
] | We present a way to solve Slavnov--Taylor identities in a general nonsupersymmetric theory. The solution can be parametrized by a limited number of functions of spacetime coordinates, so that all the effective fields are dressed by these functions via integral convolution. The solution restricts the ghost part of the effective action and gives predictions for the physical part of the effective action. |
hep-ph/9804398 | Nima Arkani Hamed | I. Antoniadis, N. Arkani-Hamed, S. Dimopoulos and G. Dvali | New Dimensions at a Millimeter to a Fermi and Superstrings at a TeV | 12 pages, latex | Phys.Lett.B436:257-263,1998 | 10.1016/S0370-2693(98)00860-0 | SLAC-PUB-7801, SU-ITP-98/28, CPTH-S608.0498, IC/98/39 | hep-ph hep-th | null | Recently, a new framework for solving the hierarchy problem has been proposed
which does not rely on low energy supersymmetry or technicolor. The
gravitational and gauge interactions unite at the electroweak scale, and the
observed weakness of gravity at long distances is due the existence of large
new spatial dimensions. In this letter, we show that this framework can be
embedded in string theory. These models have a perturbative description in the
context of type I string theory. The gravitational sector consists of closed
strings propagating in the higher-dimensional bulk, while ordinary matter
consists of open strings living on D3-branes. This scenario raises the exciting
possibility that the LHC and NLC will experimentally study both ordinary
aspects of string physics such as the production of narrow Regge-excitations of
all standard model particles, as well more exotic phenomena involving strong
gravity such as the production of black holes. The new dimensions can be probed
by events with large missing energy carried off by gravitons escaping into the
bulk. We finally discuss some important issues of model building, such as
proton stability, gauge coupling unification and supersymmetry breaking.
| [
{
"created": "Fri, 24 Apr 1998 23:43:55 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Antoniadis",
"I.",
""
],
[
"Arkani-Hamed",
"N.",
""
],
[
"Dimopoulos",
"S.",
""
],
[
"Dvali",
"G.",
""
]
] | Recently, a new framework for solving the hierarchy problem has been proposed which does not rely on low energy supersymmetry or technicolor. The gravitational and gauge interactions unite at the electroweak scale, and the observed weakness of gravity at long distances is due the existence of large new spatial dimensions. In this letter, we show that this framework can be embedded in string theory. These models have a perturbative description in the context of type I string theory. The gravitational sector consists of closed strings propagating in the higher-dimensional bulk, while ordinary matter consists of open strings living on D3-branes. This scenario raises the exciting possibility that the LHC and NLC will experimentally study both ordinary aspects of string physics such as the production of narrow Regge-excitations of all standard model particles, as well more exotic phenomena involving strong gravity such as the production of black holes. The new dimensions can be probed by events with large missing energy carried off by gravitons escaping into the bulk. We finally discuss some important issues of model building, such as proton stability, gauge coupling unification and supersymmetry breaking. |
hep-ph/0107276 | Oscar Vives | A. Masiero (SISSA) and O. Vives (U. Valencia) | CP Violation in SUSY | 10 pages, 2 figures. Invited talk by A. Masiero at Ferrara 2000, CP
violation physics | Nucl.Phys.Proc.Suppl.99B:228-237,2001 | 10.1016/S0920-5632(01)01382-2 | null | hep-ph | null | Supersymmetry exhibts new sources of CP violation. We discuss the
implications of these new contributions to CP violation both in the K and B
physics. We show that CP violation puts severe constraints on low energy SUSY,
but it represents also a promising ground to look for signals of new physics.
| [
{
"created": "Thu, 26 Jul 2001 16:35:06 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Masiero",
"A.",
"",
"SISSA"
],
[
"Vives",
"O.",
"",
"U. Valencia"
]
] | Supersymmetry exhibts new sources of CP violation. We discuss the implications of these new contributions to CP violation both in the K and B physics. We show that CP violation puts severe constraints on low energy SUSY, but it represents also a promising ground to look for signals of new physics. |
1407.7925 | Toru Kojo | Toru Kojo, Nan Su | The quark mass gap in strong magnetic fields | 4 pages, proceedings of the XXIV Quark Matter conference, May 19-24
2014, Darmstadt (Germany) | null | 10.1016/j.nuclphysa.2014.08.004 | null | hep-ph hep-lat hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Quarks in strong magnetic fields (|eB|>>Lambda_QCD^2 ~ 0.04 GeV^2) acquire
enhanced infrared phase space proportional to |eB|. Accordingly they provide
larger chiral condensates and stronger backreactions to the gluon dynamics.
Confronting theories with lattice data at various values of |eB|, one can test
theoretical ideas as well as validity of various approximations, domain of
applicability of the effective models, and so on. The particularly interesting
findings on the lattice are inverse magnetic catalysis and linear growth of the
chiral condensate as a function of |eB|, which pose theoretical challenges. In
this talk we propose a scenario to explain both phenomena, claiming that the
quark mass gap should stay at around ~ Lambda_QCD, instead of ~|eB|^{1/2} which
has been supposed from dimensional arguments and/or effective model
calculations. The contrast between infrared and ultraviolet behaviors of the
interaction is a key ingredient to obtain the mass gap of ~Lambda_QCD.
| [
{
"created": "Wed, 30 Jul 2014 02:40:49 GMT",
"version": "v1"
}
] | 2015-06-22 | [
[
"Kojo",
"Toru",
""
],
[
"Su",
"Nan",
""
]
] | Quarks in strong magnetic fields (|eB|>>Lambda_QCD^2 ~ 0.04 GeV^2) acquire enhanced infrared phase space proportional to |eB|. Accordingly they provide larger chiral condensates and stronger backreactions to the gluon dynamics. Confronting theories with lattice data at various values of |eB|, one can test theoretical ideas as well as validity of various approximations, domain of applicability of the effective models, and so on. The particularly interesting findings on the lattice are inverse magnetic catalysis and linear growth of the chiral condensate as a function of |eB|, which pose theoretical challenges. In this talk we propose a scenario to explain both phenomena, claiming that the quark mass gap should stay at around ~ Lambda_QCD, instead of ~|eB|^{1/2} which has been supposed from dimensional arguments and/or effective model calculations. The contrast between infrared and ultraviolet behaviors of the interaction is a key ingredient to obtain the mass gap of ~Lambda_QCD. |
hep-ph/9302287 | null | V. Pleitez | $SU(n)_c\otimes SU(m)_L\otimes U(1)_N$ generalizations of the Standard
Model | Revtex 14 pages, Revised and extended version of preprint
IFT-P.010/93 | null | null | null | hep-ph | null | We consider generalizations of the standard model (SM) which are based on the
gauge symmetry $SU(n)_c\otimes SU(m)_L\otimes U(1)_N$. Although the most
interesting possibilities occur when $n=3$, we will consider also the cases
$n=4,5$ both with $m=3,4$. Models with left-right symmetry, horizontal
symmetries and the possible embedding in a larger group (grand unification
scenarios) are briefly discussed.
| [
{
"created": "Mon, 22 Feb 1993 12:32:00 GMT",
"version": "v1"
},
{
"created": "Sun, 12 Sep 1993 12:58:00 GMT",
"version": "v2"
}
] | 2008-02-03 | [
[
"Pleitez",
"V.",
""
]
] | We consider generalizations of the standard model (SM) which are based on the gauge symmetry $SU(n)_c\otimes SU(m)_L\otimes U(1)_N$. Although the most interesting possibilities occur when $n=3$, we will consider also the cases $n=4,5$ both with $m=3,4$. Models with left-right symmetry, horizontal symmetries and the possible embedding in a larger group (grand unification scenarios) are briefly discussed. |
hep-ph/9311332 | Michael M. Tung | J.G. K"orner, A. Pilaftsis and M.M. Tung | One-Loop QCD Mass Effects in the Production of Polarized Bottom and Top
Quarks | 17 p. (5 figs available upon request), LaTeX, MZ-TH/93-30, RAL/93-81,
FTUV/93-46 | Z.Phys. C63 (1994) 575-579 | 10.1007/BF01557623 | null | hep-ph | null | The analytic expressions for the production cross sections of polarized
bottom and top quarks in $e^+e^-$ annihilation are explicitly derived at the
one-loop order of strong interactions. Chirality-violating mass effects will
reduce the longitudinal spin polarization for the light quark pairs by an
amount of $3\%$, when one properly considers the massless limit for the final
quarks. Numerical estimates of longitudinal spin polarization effects in the
processes $e^+e^-\to b\bar{b}(g)$ and $e^+e^- \to t\bar{t}(g)$ are presented.
| [
{
"created": "Mon, 22 Nov 1993 16:44:05 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"K\"orner",
"J. G.",
""
],
[
"Pilaftsis",
"A.",
""
],
[
"Tung",
"M. M.",
""
]
] | The analytic expressions for the production cross sections of polarized bottom and top quarks in $e^+e^-$ annihilation are explicitly derived at the one-loop order of strong interactions. Chirality-violating mass effects will reduce the longitudinal spin polarization for the light quark pairs by an amount of $3\%$, when one properly considers the massless limit for the final quarks. Numerical estimates of longitudinal spin polarization effects in the processes $e^+e^-\to b\bar{b}(g)$ and $e^+e^- \to t\bar{t}(g)$ are presented. |
1808.05067 | Konrad Tywoniuk | Konrad Tywoniuk and Yacine Mehtar-Tani | Quantifying jet modifications with substructure | Proceedings of the XXVIIth International Conference on
Ultrarelativistic Nucleus-Nucleus Collisions (Quark Matter 2018), 13-19 May
2018, Venice, Italy | null | null | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The striking suppression and modification patterns that are observed in jet
observables measured in heavy-ion collisions with respect to the proton-proton
baseline have the potential to constrain the spatio-temporal branching process
of energetic partons in a dense QCD medium. The mechanism of jet energy loss is
intricately associated with medium resolution of jet substructure fluctuations.
This naturally affects the behavior of the suppression of jets at high-pT,
inducing an explicit dependence on jet scales. In this contribution, we review
recent work on using the insight from multi-parton quenching to calculate
leading-logarithmic corrections to the single-inclusive jet spectrum, and
discuss its impact on a wide range of observables, including jet substructure.
| [
{
"created": "Wed, 15 Aug 2018 13:26:33 GMT",
"version": "v1"
}
] | 2018-08-16 | [
[
"Tywoniuk",
"Konrad",
""
],
[
"Mehtar-Tani",
"Yacine",
""
]
] | The striking suppression and modification patterns that are observed in jet observables measured in heavy-ion collisions with respect to the proton-proton baseline have the potential to constrain the spatio-temporal branching process of energetic partons in a dense QCD medium. The mechanism of jet energy loss is intricately associated with medium resolution of jet substructure fluctuations. This naturally affects the behavior of the suppression of jets at high-pT, inducing an explicit dependence on jet scales. In this contribution, we review recent work on using the insight from multi-parton quenching to calculate leading-logarithmic corrections to the single-inclusive jet spectrum, and discuss its impact on a wide range of observables, including jet substructure. |
2303.11509 | Sanghwa Park | Alberto Accardi, Xiaoxian Jing, Joseph Francis Owens, Sanghwa Park | Light quark and antiquark constraints from new electroweak data | null | null | 10.1103/PhysRevD.107.113005 | JLAB-THY-23-3782 | hep-ph hep-ex nucl-th | http://creativecommons.org/licenses/by-nc-sa/4.0/ | We present a new parton distribution function analysis which includes new
data for W boson production in proton-proton collisions and lepton pair
production in proton-proton and proton-deuteron collisions. The new data
provide strong constraints on the light antiquark parton distribution functions
in the proton. We identify an interesting correlation between the $d/u$ ratio
and the $\bar{d}/\bar{u}$ ratio which leads to a modification of our previous
results for the $d/u$ ratio as the parton momentum fraction $x \rightarrow 1.$
| [
{
"created": "Tue, 21 Mar 2023 00:08:36 GMT",
"version": "v1"
}
] | 2023-07-13 | [
[
"Accardi",
"Alberto",
""
],
[
"Jing",
"Xiaoxian",
""
],
[
"Owens",
"Joseph Francis",
""
],
[
"Park",
"Sanghwa",
""
]
] | We present a new parton distribution function analysis which includes new data for W boson production in proton-proton collisions and lepton pair production in proton-proton and proton-deuteron collisions. The new data provide strong constraints on the light antiquark parton distribution functions in the proton. We identify an interesting correlation between the $d/u$ ratio and the $\bar{d}/\bar{u}$ ratio which leads to a modification of our previous results for the $d/u$ ratio as the parton momentum fraction $x \rightarrow 1.$ |
0904.4503 | Andreas Ipp | Andreas Ipp, Christoph H. Keitel, J\"org Evers | Yoctosecond photon pulses from quark-gluon plasmas | 4 pages, 2 figures; final version as accepted by PRL | Phys.Rev.Lett.103:152301,2009 | 10.1103/PhysRevLett.103.152301 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Present ultra-fast laser optics is at the frontier between atto- and
zeptosecond photon pulses, giving rise to unprecedented applications. We show
that high-energetic photon pulses down to the yoctosecond timescale can be
produced in heavy ion collisions. We focus on photons produced during the
initial phase of the expanding quark-gluon plasma. We study how the time
evolution and properties of the plasma may influence the duration and shape of
the photon pulse. Prospects for achieving double peak structures suitable for
pump-probe experiments at the yoctosecond timescale are discussed.
| [
{
"created": "Wed, 29 Apr 2009 14:50:39 GMT",
"version": "v1"
},
{
"created": "Thu, 15 Oct 2009 12:15:58 GMT",
"version": "v2"
}
] | 2010-05-28 | [
[
"Ipp",
"Andreas",
""
],
[
"Keitel",
"Christoph H.",
""
],
[
"Evers",
"Jörg",
""
]
] | Present ultra-fast laser optics is at the frontier between atto- and zeptosecond photon pulses, giving rise to unprecedented applications. We show that high-energetic photon pulses down to the yoctosecond timescale can be produced in heavy ion collisions. We focus on photons produced during the initial phase of the expanding quark-gluon plasma. We study how the time evolution and properties of the plasma may influence the duration and shape of the photon pulse. Prospects for achieving double peak structures suitable for pump-probe experiments at the yoctosecond timescale are discussed. |
hep-ph/9705222 | Mustafa Savci | T.M. Aliev, M. Savci, A. Ozpineci (Middle East Tech. U., Ankara), H.
Koru (Gazi U., Ankara) | Two Higgs Doublet Model and Lepton Polarization in the B -> K tau+ tau-
Decay | 25 pages, 20 figures, LaTeX formatted | J.Phys.G24:49-65,1998 | 10.1088/0954-3899/24/1/009 | METU-PHYS-HEP-97-17 | hep-ph | null | The decay width, forward-backward asymmetry and tau lepton longitudinal and
transversal polarization for the exclusive (B -> K tau^+ tau^-) decay in a two
Higgs doublet model are computed. It is shown that the forward-backward
asymmetry and longitudinal polarization of the tau lepton are very effective
tools for establishing new physics.
| [
{
"created": "Sat, 3 May 1997 11:57:36 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Oct 1997 21:42:35 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Aliev",
"T. M.",
"",
"Middle East Tech. U., Ankara"
],
[
"Savci",
"M.",
"",
"Middle East Tech. U., Ankara"
],
[
"Ozpineci",
"A.",
"",
"Middle East Tech. U., Ankara"
],
[
"Koru",
"H.",
"",
"Gazi U., Ankara"
]
] | The decay width, forward-backward asymmetry and tau lepton longitudinal and transversal polarization for the exclusive (B -> K tau^+ tau^-) decay in a two Higgs doublet model are computed. It is shown that the forward-backward asymmetry and longitudinal polarization of the tau lepton are very effective tools for establishing new physics. |
2306.08584 | An Gu | An Gu, Fuqiang Wang | Transverse momentum spectra of $f_0(980)$ from coalescence model | null | null | null | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use a coalescence model to generate $f_{0}$(980) particles for four
configurations: ${s\bar{s}}$ meson, ${u\bar{u}s\bar{s}}$ tetraquark,
${K^{+}K^{-}}$ molecule and $u\bar{u}$ p-wave state. The phase-space
information of the coalescing constituents is taken from a multi-phase
transport (AMPT) simulation of proton-proton and proton-lead collisions at the
LHC. It is shown that the transverse momentum spectra and production yields of
$f_0(980)$ differ significantly among the configurations. It is suggested that
the $p_T$ spectra of the $f_0(980)$ compared to those of other hadrons (such as
pion) and the ratio of the $f_0(980)$ $p_T$ spectra in pPb over pp can be
exploited to tell the configuration of the $f_0(980)$.
| [
{
"created": "Wed, 14 Jun 2023 15:46:10 GMT",
"version": "v1"
},
{
"created": "Sat, 30 Dec 2023 16:31:52 GMT",
"version": "v2"
}
] | 2024-01-02 | [
[
"Gu",
"An",
""
],
[
"Wang",
"Fuqiang",
""
]
] | We use a coalescence model to generate $f_{0}$(980) particles for four configurations: ${s\bar{s}}$ meson, ${u\bar{u}s\bar{s}}$ tetraquark, ${K^{+}K^{-}}$ molecule and $u\bar{u}$ p-wave state. The phase-space information of the coalescing constituents is taken from a multi-phase transport (AMPT) simulation of proton-proton and proton-lead collisions at the LHC. It is shown that the transverse momentum spectra and production yields of $f_0(980)$ differ significantly among the configurations. It is suggested that the $p_T$ spectra of the $f_0(980)$ compared to those of other hadrons (such as pion) and the ratio of the $f_0(980)$ $p_T$ spectra in pPb over pp can be exploited to tell the configuration of the $f_0(980)$. |
hep-ph/9411281 | My Account | D. Nanopoulos | The march towards no-scale supergravity | 20 pages, latex, no figures. Invited talk presented at the
International Conference on: ``The History of Original Ideas and Basic
Discoveries in Particle Physics", Erice, Italy, 29 July - 4 August 1994 | null | null | CERN-TH.7423/94 and CTP-TAMU-59/94 | hep-ph hep-th | null | The different steps that led us to the discovery of {\em no-scale
supergravity} are discussed from a very personal point of view. No-scale
supergravity has been heralded as the most promising effective theory that
describes physics below the Planck scale. In its string-derived form it holds
the potential for a Dynamical Determination Of Everything (DDOE). (Invited talk
presented at the International Conference on: ``The History of Original Ideas
and Basic Discoveries in Particle Physics", Erice, Italy, 29 July - 4 August
1994.)
| [
{
"created": "Sat, 12 Nov 1994 21:49:20 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Nov 1994 16:21:39 GMT",
"version": "v2"
}
] | 2008-02-03 | [
[
"Nanopoulos",
"D.",
""
]
] | The different steps that led us to the discovery of {\em no-scale supergravity} are discussed from a very personal point of view. No-scale supergravity has been heralded as the most promising effective theory that describes physics below the Planck scale. In its string-derived form it holds the potential for a Dynamical Determination Of Everything (DDOE). (Invited talk presented at the International Conference on: ``The History of Original Ideas and Basic Discoveries in Particle Physics", Erice, Italy, 29 July - 4 August 1994.) |
1503.01088 | Andrzej Siodmok | Mrinal Dasgupta, Alexander Powling, Andrzej Siodmok | On jet substructure methods for signal jets | 53 pages, 21 figures. Version published in JHEP: addressed several
points raised by the referee | JHEP08(2015)079 | 10.1007/JHEP08(2015)079 | CERN-PH-TH-2015-032, MCnet-15-03 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We carry out simple analytical calculations and Monte Carlo studies to better
understand the impact of QCD radiation on some well-known jet substructure
methods for jets arising from the decay of boosted Higgs bosons. Understanding
differences between taggers for these signal jets assumes particular
significance in situations where they perform similarly on QCD background jets.
As an explicit example of this we compare the Y-splitter method to the more
recently proposed Y-pruning technique. We demonstrate how the insight we gain
can be used to significantly improve the performance of Y-splitter by combining
it with trimming and show that this combination outperforms the other taggers
studied here, at high $p_T$. We also make analytical estimates for optimal
parameter values, for a range of methods and compare to results from Monte
Carlo studies.
| [
{
"created": "Tue, 3 Mar 2015 20:10:33 GMT",
"version": "v1"
},
{
"created": "Thu, 27 Aug 2015 15:58:36 GMT",
"version": "v2"
}
] | 2015-08-28 | [
[
"Dasgupta",
"Mrinal",
""
],
[
"Powling",
"Alexander",
""
],
[
"Siodmok",
"Andrzej",
""
]
] | We carry out simple analytical calculations and Monte Carlo studies to better understand the impact of QCD radiation on some well-known jet substructure methods for jets arising from the decay of boosted Higgs bosons. Understanding differences between taggers for these signal jets assumes particular significance in situations where they perform similarly on QCD background jets. As an explicit example of this we compare the Y-splitter method to the more recently proposed Y-pruning technique. We demonstrate how the insight we gain can be used to significantly improve the performance of Y-splitter by combining it with trimming and show that this combination outperforms the other taggers studied here, at high $p_T$. We also make analytical estimates for optimal parameter values, for a range of methods and compare to results from Monte Carlo studies. |
1712.08121 | Kai Schmitz | Valerie Domcke, Kai Schmitz | Inflation from High-Scale Supersymmetry Breaking | 61 pages + references, 5 figures. v2: minor changes, updated
references, matches version published in PRD | Phys. Rev. D 97, 115025 (2018) | 10.1103/PhysRevD.97.115025 | DESY 17-223 | hep-ph astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Supersymmetry breaking close to the scale of grand unification can explain
cosmic inflation. As we demonstrate in this paper, this can be achieved in
strongly coupled supersymmetric gauge theories, such that the energy scales of
inflation and supersymmetry breaking are generated dynamically. As a
consequence, both scales are related to each other and exponentially suppressed
compared to the Planck scale. As an example, we consider a dynamical model in
which gauging a global flavor symmetry in the supersymmetry-breaking sector
gives rise to a Fayet-Iliopoulos D term. This results in successful D-term
hybrid inflation in agreement with all theoretical and phenomenological
constraints. The gauged flavor symmetry can be identified with U(1)_B-L, where
B and L denote baryon and lepton number, respectively. In the end, we arrive at
a consistent cosmological scenario that provides a unified picture of
high-scale supersymmetry breaking, viable D-term hybrid inflation, spontaneous
B-L breaking at the scale of grand unification, baryogenesis via leptogenesis,
and standard model neutrino masses due to the type-I seesaw mechanism.
| [
{
"created": "Thu, 21 Dec 2017 17:59:21 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Jun 2018 10:26:55 GMT",
"version": "v2"
}
] | 2018-06-26 | [
[
"Domcke",
"Valerie",
""
],
[
"Schmitz",
"Kai",
""
]
] | Supersymmetry breaking close to the scale of grand unification can explain cosmic inflation. As we demonstrate in this paper, this can be achieved in strongly coupled supersymmetric gauge theories, such that the energy scales of inflation and supersymmetry breaking are generated dynamically. As a consequence, both scales are related to each other and exponentially suppressed compared to the Planck scale. As an example, we consider a dynamical model in which gauging a global flavor symmetry in the supersymmetry-breaking sector gives rise to a Fayet-Iliopoulos D term. This results in successful D-term hybrid inflation in agreement with all theoretical and phenomenological constraints. The gauged flavor symmetry can be identified with U(1)_B-L, where B and L denote baryon and lepton number, respectively. In the end, we arrive at a consistent cosmological scenario that provides a unified picture of high-scale supersymmetry breaking, viable D-term hybrid inflation, spontaneous B-L breaking at the scale of grand unification, baryogenesis via leptogenesis, and standard model neutrino masses due to the type-I seesaw mechanism. |
2405.00164 | Volodymyr Gorkavenko | Yuliia Borysenkova, Volodymyr Gorkavenko, Ivan Hrynchak, Oleksandr
Khasai, Mariia Tsarenkova | Divergences in the effective loop interaction of the Chern-Simons bosons
with leptons. The unitary gauge case | 11 pages, 2 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we consider the extension of the Standard Model with
Chern-Simons type interaction. There is a new vector massive boson
(Chern-Simons bosons) in this extension. Using only three-particle dimension-4
interaction of the Chern-Simons bosons with vector bosons of the SM, we
consider effective loop interaction of a new vector boson with leptons. We
consider the renormalizability of this loop interaction and conclude that for
the case of computation of loop diagrams in the unitary gauge, we can not get
rid of the divergences in the effective interaction of the Chern-Simons bosons
with leptons.
| [
{
"created": "Tue, 30 Apr 2024 19:28:07 GMT",
"version": "v1"
}
] | 2024-05-02 | [
[
"Borysenkova",
"Yuliia",
""
],
[
"Gorkavenko",
"Volodymyr",
""
],
[
"Hrynchak",
"Ivan",
""
],
[
"Khasai",
"Oleksandr",
""
],
[
"Tsarenkova",
"Mariia",
""
]
] | In this paper, we consider the extension of the Standard Model with Chern-Simons type interaction. There is a new vector massive boson (Chern-Simons bosons) in this extension. Using only three-particle dimension-4 interaction of the Chern-Simons bosons with vector bosons of the SM, we consider effective loop interaction of a new vector boson with leptons. We consider the renormalizability of this loop interaction and conclude that for the case of computation of loop diagrams in the unitary gauge, we can not get rid of the divergences in the effective interaction of the Chern-Simons bosons with leptons. |
2308.13329 | Satoshi Mishima | Toru Goto, Satoshi Mishima, Tetsuo Shindou | Flavor physics in SU(5) GUT with scalar fields in the 45 representation | 29 pages, 7 figures; v2: references added; v3: matches published
version | Phys. Rev. D 108, 095012 (2023) | 10.1103/PhysRevD.108.095012 | KEK-TH-2543, KU-PH-036 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study a realistic SU(5) grand unified model, where a 45 representation of
scalar fields is added to the Georgi-Glashow model in order to realize the
gauge coupling unification and the masses and mixing of quarks and leptons. The
gauge coupling unification together with constraints from proton decay implies
mass splittings in scalar representations. We assume that an SU(2) triplet
component of the 45 scalar, which is called $S_3$ leptoquark, has a TeV-scale
mass, and color-sextet and color-octet ones have masses of the order of $10^6$
GeV. We calculate one-loop beta functions for Yukawa couplings in the model,
and derive the low-energy values of the $S_3$ Yukawa couplings which are
consistent with the grand unification. We provide predictions for lepton-flavor
violation and lepton-flavor-universality violation induced by the $S_3$
leptoquark, and find that current and future experiments have a chance to find
a footprint of our SU(5) model.
| [
{
"created": "Fri, 25 Aug 2023 12:04:17 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Sep 2023 07:12:48 GMT",
"version": "v2"
},
{
"created": "Fri, 17 Nov 2023 10:02:22 GMT",
"version": "v3"
}
] | 2023-11-20 | [
[
"Goto",
"Toru",
""
],
[
"Mishima",
"Satoshi",
""
],
[
"Shindou",
"Tetsuo",
""
]
] | We study a realistic SU(5) grand unified model, where a 45 representation of scalar fields is added to the Georgi-Glashow model in order to realize the gauge coupling unification and the masses and mixing of quarks and leptons. The gauge coupling unification together with constraints from proton decay implies mass splittings in scalar representations. We assume that an SU(2) triplet component of the 45 scalar, which is called $S_3$ leptoquark, has a TeV-scale mass, and color-sextet and color-octet ones have masses of the order of $10^6$ GeV. We calculate one-loop beta functions for Yukawa couplings in the model, and derive the low-energy values of the $S_3$ Yukawa couplings which are consistent with the grand unification. We provide predictions for lepton-flavor violation and lepton-flavor-universality violation induced by the $S_3$ leptoquark, and find that current and future experiments have a chance to find a footprint of our SU(5) model. |
1902.06567 | Maurizio Giannotti | Paolo Di Vecchia, Maurizio Giannotti, Massimiliano Lattanzi and Axel
Lindner | Round Table on Axions and Axion-like Particles | Contributed to the proceedings of the XIII Quark Confinement and the
Hadron Spectrum - Confinement conference. References updated | null | null | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this contribution, based on the discussion at a round table of the XIII
Quark Confinement and the Hadron Spectrum - Confinement conference, we review
the main properties of the QCD axion and, more generally, of axion-like
particles and their relevance in astrophysics and cosmology. In the last
section we describe the experimental concepts to search for the QCD axion and
axion-like particles (ALPs).
| [
{
"created": "Mon, 18 Feb 2019 13:41:46 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Mar 2019 16:59:12 GMT",
"version": "v2"
}
] | 2019-03-06 | [
[
"Di Vecchia",
"Paolo",
""
],
[
"Giannotti",
"Maurizio",
""
],
[
"Lattanzi",
"Massimiliano",
""
],
[
"Lindner",
"Axel",
""
]
] | In this contribution, based on the discussion at a round table of the XIII Quark Confinement and the Hadron Spectrum - Confinement conference, we review the main properties of the QCD axion and, more generally, of axion-like particles and their relevance in astrophysics and cosmology. In the last section we describe the experimental concepts to search for the QCD axion and axion-like particles (ALPs). |
1912.00404 | Sibo Zheng | Shuai Xu and Sibo Zheng | Probing Electroweak Dark Matter at 14 TeV LHC | Revtex, 9 pp; v2: 10 pages, journal version with typos corrected and
more materials added | Chin. Phys. C 44 (2020) 113101 | 10.1088/1674-1137/abae4c | null | hep-ph astro-ph.CO hep-ex | http://creativecommons.org/licenses/by/4.0/ | Well-motivated electroweak dark matter is often hosted by an extended
electroweak sector which also contains new lepton pairs with masses near the
weak scale. In this paper, we explore such electroweak dark matter via
combining dark matter direct detections and high-luminosity LHC probes of new
lepton pairs. Using $Z$- and $W$-associated electroweak processes with two or
three lepton final states, we show that dependent on the overall coupling
constant, dark matter mass up to $170-210$ GeV can be excluded at $2\sigma$
level and up to $175-205$ GeV can be discovered at $5\sigma$ level at the 14
TeV LHC with integrated luminosities 300 fb$^{-1}$ and 3000 fb$^{-1}$,
respectively.
| [
{
"created": "Sun, 1 Dec 2019 13:25:04 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Jul 2020 11:02:57 GMT",
"version": "v2"
}
] | 2020-09-14 | [
[
"Xu",
"Shuai",
""
],
[
"Zheng",
"Sibo",
""
]
] | Well-motivated electroweak dark matter is often hosted by an extended electroweak sector which also contains new lepton pairs with masses near the weak scale. In this paper, we explore such electroweak dark matter via combining dark matter direct detections and high-luminosity LHC probes of new lepton pairs. Using $Z$- and $W$-associated electroweak processes with two or three lepton final states, we show that dependent on the overall coupling constant, dark matter mass up to $170-210$ GeV can be excluded at $2\sigma$ level and up to $175-205$ GeV can be discovered at $5\sigma$ level at the 14 TeV LHC with integrated luminosities 300 fb$^{-1}$ and 3000 fb$^{-1}$, respectively. |
hep-ph/9705333 | null | G. Montagna, M. Moretti, O.Nicrosini and F. Piccinini | Six-Fermion Calculation of Intermediate-mass Higgs Boson Production at
Future $e^+ e^-$ Colliders | 31 pages, LaTeX, 15 eps low-resolution figures included | Eur.Phys.J.C2:483-496,1998 | 10.1007/s100520050155 | FNT/T-97/10 | hep-ph | null | The production of an intermediate-mass Higgs boson in processes of the kind
$e^+ e^- \to 6$ fermions at the energies of future linear colliders is studied.
The recently developed and fully automatic algorithm/code ALPHA is used to
compute the tree-level scattering amplitudes for the reactions $e^+ e^- \to
\mu^+ \mu^- \tau^- \bar\nu_{\tau} u \bar d, \mu^+ \mu^- e^- \bar\nu_{e} u \bar
d$. The code has been interfaced with the Monte Carlo program HIGGSPV/WWGENPV,
properly adapted to 6-fermion production, in order to provide realistic
results, both in the form of cross sections and event samples at the partonic
level. Phenomenological results, that incorporate the effects of initial-state
radiation and beamstrahlung, are shown and commented, emphasizing the
potentials of full six-fermion calculations for precise background evaluation
as well as for detailed studies of the fundamental properties of the Higgs
particle.
| [
{
"created": "Fri, 16 May 1997 10:28:28 GMT",
"version": "v1"
}
] | 2011-09-13 | [
[
"Montagna",
"G.",
""
],
[
"Moretti",
"M.",
""
],
[
"Nicrosini",
"O.",
""
],
[
"Piccinini",
"F.",
""
]
] | The production of an intermediate-mass Higgs boson in processes of the kind $e^+ e^- \to 6$ fermions at the energies of future linear colliders is studied. The recently developed and fully automatic algorithm/code ALPHA is used to compute the tree-level scattering amplitudes for the reactions $e^+ e^- \to \mu^+ \mu^- \tau^- \bar\nu_{\tau} u \bar d, \mu^+ \mu^- e^- \bar\nu_{e} u \bar d$. The code has been interfaced with the Monte Carlo program HIGGSPV/WWGENPV, properly adapted to 6-fermion production, in order to provide realistic results, both in the form of cross sections and event samples at the partonic level. Phenomenological results, that incorporate the effects of initial-state radiation and beamstrahlung, are shown and commented, emphasizing the potentials of full six-fermion calculations for precise background evaluation as well as for detailed studies of the fundamental properties of the Higgs particle. |
1707.09442 | Nirmal Raj | Nirmal Raj, Philip Tanedo, Hai-Bo Yu | Neutron stars at the dark matter direct detection frontier | 6 pages, 3 figures | Phys. Rev. D 97, 043006 (2018) | 10.1103/PhysRevD.97.043006 | UCR-TR-2017-FLIP-NCC-1701 | hep-ph astro-ph.HE astro-ph.IM hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Neutron stars capture dark matter efficiently. The kinetic energy transferred
during capture heats old neutron stars in the local galactic halo to
temperatures detectable by upcoming infrared telescopes. We derive the
sensitivity of this probe in the framework of effective operators. For dark
matter heavier than a GeV, we find that neutron star heating can set limits on
the effective operator cutoff that are orders of magnitude stronger than
possible from terrestrial direct detection experiments in the case of
spin-dependent and velocity-suppressed scattering.
| [
{
"created": "Sat, 29 Jul 2017 00:23:02 GMT",
"version": "v1"
}
] | 2019-10-21 | [
[
"Raj",
"Nirmal",
""
],
[
"Tanedo",
"Philip",
""
],
[
"Yu",
"Hai-Bo",
""
]
] | Neutron stars capture dark matter efficiently. The kinetic energy transferred during capture heats old neutron stars in the local galactic halo to temperatures detectable by upcoming infrared telescopes. We derive the sensitivity of this probe in the framework of effective operators. For dark matter heavier than a GeV, we find that neutron star heating can set limits on the effective operator cutoff that are orders of magnitude stronger than possible from terrestrial direct detection experiments in the case of spin-dependent and velocity-suppressed scattering. |
2401.14188 | Teng Ji | Teng Ji, Xiang-Kun Dong and Ulf-G. Mei{\ss}ner | Interactions of the Pseudoscalar Meson Octet and the Baryon Decuplet in
the Continuum and a Finite Volume | 11 pages, 6 figures and 2 tables | Eur. Phys. J. C 84:408 (2024) | 10.1140/epjc/s10052-024-12793-8 | null | hep-ph hep-ex hep-lat nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This study focuses on the interaction of the pseudoscalar meson octet and the
baryon decuplet. In the continuum, it is observed that several
$J^{P}=\frac32^-$ baryon resonances can be produced by the Weinberg-Tomozawa
interaction in unitarized chiral perturbation theory, including the $N(1875)$,
$\Sigma(1670)$, $\Sigma(1910)$, $\Xi(1820)$ and $\Omega(2012)$. Among them, the
$\Xi(1820)$ and $\Sigma(1670)$ may exhibit a potential two-pole structures. The
unitarized chiral perturbation approach is then applied as the underlying
theory to predict the energy levels of these systems in a finite volume. These
energy levels are well described by the $K$-matrix parameterization constrained
by flavor SU(3) symmetry. With the parameters from the best fits, the poles
extracted from the $K$-matrix parameterization closely correspond to those
derived from the underlying chiral effective field theory, as long as they are
close to physical region and not significantly higher than the lowest relevant
threshold.
| [
{
"created": "Thu, 25 Jan 2024 13:52:46 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Apr 2024 09:10:29 GMT",
"version": "v2"
}
] | 2024-04-24 | [
[
"Ji",
"Teng",
""
],
[
"Dong",
"Xiang-Kun",
""
],
[
"Meißner",
"Ulf-G.",
""
]
] | This study focuses on the interaction of the pseudoscalar meson octet and the baryon decuplet. In the continuum, it is observed that several $J^{P}=\frac32^-$ baryon resonances can be produced by the Weinberg-Tomozawa interaction in unitarized chiral perturbation theory, including the $N(1875)$, $\Sigma(1670)$, $\Sigma(1910)$, $\Xi(1820)$ and $\Omega(2012)$. Among them, the $\Xi(1820)$ and $\Sigma(1670)$ may exhibit a potential two-pole structures. The unitarized chiral perturbation approach is then applied as the underlying theory to predict the energy levels of these systems in a finite volume. These energy levels are well described by the $K$-matrix parameterization constrained by flavor SU(3) symmetry. With the parameters from the best fits, the poles extracted from the $K$-matrix parameterization closely correspond to those derived from the underlying chiral effective field theory, as long as they are close to physical region and not significantly higher than the lowest relevant threshold. |
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