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0909.0947 | Aneesh Manohar | Jui-yu Chiu, Andreas Fuhrer, Randall Kelley, and Aneesh V. Manohar | Soft and Collinear Functions for the Standard Model | 23 pages, 12 figures. Typos fixed. Lepton collinear function plot
included | Phys.Rev.D81:014023,2010 | 10.1103/PhysRevD.81.014023 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Radiative corrections to high energy scattering processes were given
previously in terms of universal soft and collinear functions. This paper gives
the collinear functions for all standard model particles, the general form of
the soft function, and explicit expressions for the soft functions for
fermion-fermion scattering, longitudinal and transverse gauge boson production,
single W/Z production, and associated Higgs production. An interesting subtlety
in the use of the Goldstone boson equivalence theorem for longitudinal W+
production is discussed.
| [
{
"created": "Mon, 7 Sep 2009 15:53:45 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Sep 2009 15:43:06 GMT",
"version": "v2"
}
] | 2010-04-06 | [
[
"Chiu",
"Jui-yu",
""
],
[
"Fuhrer",
"Andreas",
""
],
[
"Kelley",
"Randall",
""
],
[
"Manohar",
"Aneesh V.",
""
]
] | Radiative corrections to high energy scattering processes were given previously in terms of universal soft and collinear functions. This paper gives the collinear functions for all standard model particles, the general form of the soft function, and explicit expressions for the soft functions for fermion-fermion scattering, longitudinal and transverse gauge boson production, single W/Z production, and associated Higgs production. An interesting subtlety in the use of the Goldstone boson equivalence theorem for longitudinal W+ production is discussed. |
hep-ph/0004053 | K. Sridhar | K. Sridhar (TIFR) | Large Extra Dimensions at Linear Colliders | Talk given at the Third International Workshop on Electron-Electron
Interactions at TeV Energies (e- e- 99), Santa Cruz, California, 10-12 Dec
1999. 7 pages, LaTeX, style files attached | Int.J.Mod.Phys.A15:2397-2404,2000 | 10.1142/S0217751X00002469 | TIFR/TH/16 | hep-ph | null | In this talk, I first present the motivation for theories wherein extra
spacetime dimensions can be compactified to have large magnitudes. In
particular, I discuss the Arkani-Hamed, Dimopoulos, Dvali (ADD) scenario. I
present the constraints that have been derived on these models from current
experiments and the expectations from future colliders. I concentrate
particularly on the possibilities of probing these extra dimensions at future
linear colliders.
| [
{
"created": "Thu, 6 Apr 2000 12:04:39 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Sridhar",
"K.",
"",
"TIFR"
]
] | In this talk, I first present the motivation for theories wherein extra spacetime dimensions can be compactified to have large magnitudes. In particular, I discuss the Arkani-Hamed, Dimopoulos, Dvali (ADD) scenario. I present the constraints that have been derived on these models from current experiments and the expectations from future colliders. I concentrate particularly on the possibilities of probing these extra dimensions at future linear colliders. |
1506.04481 | Su-Kyeong Lee | Jeong Hun Yang, Su Kyeong Lee, Eun-Joo Kim and Jong Bum Choi | Analysis of $X$ Particle Spectra in Quarkonium Model | 16 pages, 3 figures, 7 tables | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Three more $X$ particles are established in the 2014 Particle Data compared
with the 2012 ones. There are now five established $X$ particles named as
$X(3872)$, $X(3900)$, $X(4260)$, $X(4360)$, and $X(4660)$. Since the first $X$
particle $X(3872)$ was discovered during the search for the remaining P
charmonium states, it is valuable to check whether the established $X$
particles can be explained by quarkonium model. In this paper, we try to
calculate the mass spectra of charmonium system by considering spin-dependent
forces deduced from one gluon exchange diagrams. The confining potential form
is taken to be linear and the free parameters are determined by least squares
method comparing the theoretical and the observed masses of charmonium states.
| [
{
"created": "Mon, 15 Jun 2015 05:33:33 GMT",
"version": "v1"
}
] | 2015-06-16 | [
[
"Yang",
"Jeong Hun",
""
],
[
"Lee",
"Su Kyeong",
""
],
[
"Kim",
"Eun-Joo",
""
],
[
"Choi",
"Jong Bum",
""
]
] | Three more $X$ particles are established in the 2014 Particle Data compared with the 2012 ones. There are now five established $X$ particles named as $X(3872)$, $X(3900)$, $X(4260)$, $X(4360)$, and $X(4660)$. Since the first $X$ particle $X(3872)$ was discovered during the search for the remaining P charmonium states, it is valuable to check whether the established $X$ particles can be explained by quarkonium model. In this paper, we try to calculate the mass spectra of charmonium system by considering spin-dependent forces deduced from one gluon exchange diagrams. The confining potential form is taken to be linear and the free parameters are determined by least squares method comparing the theoretical and the observed masses of charmonium states. |
hep-ph/0102048 | Massimo Blasone | Massimo Blasone, Antonio Capolupo, Oreste Romei, Giuseppe Vitiello | Quantum Field Theory of boson mixing | 13 pages, 6 figures, RevTeX | Phys.Rev. D63 (2001) 125015 | 10.1103/PhysRevD.63.125015 | null | hep-ph | null | We consider the quantum field theoretical formulation of boson field mixing
and obtain the exact oscillation formula. This formula does not depend on
arbitrary mass parameters. We show that the space for the mixed field states is
unitarily inequivalent to the state space where the unmixed field operators are
defined. We also study the structure of the currents and charges for the mixed
fields.
| [
{
"created": "Mon, 5 Feb 2001 18:13:33 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Blasone",
"Massimo",
""
],
[
"Capolupo",
"Antonio",
""
],
[
"Romei",
"Oreste",
""
],
[
"Vitiello",
"Giuseppe",
""
]
] | We consider the quantum field theoretical formulation of boson field mixing and obtain the exact oscillation formula. This formula does not depend on arbitrary mass parameters. We show that the space for the mixed field states is unitarily inequivalent to the state space where the unmixed field operators are defined. We also study the structure of the currents and charges for the mixed fields. |
1205.0757 | Elvio Di Salvo | Z. J. Ajaltouni and E. Di Salvo | Interference Effects, Time Reversal Violation and Search for New Physics
in Hadronic Weak Decays | 35 pages | International Journal of Modern Physics A 27 (2012) 1250086 | 10.1142/S0217751X12500868 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose some methods for studying hadronic sequential two-body decays
involving more spinning particles. It relies on the analysis of T-odd and
T-even asymmetries, which are related to interference terms. The latter
asymmetries turn out to be as useful as the former ones in inferring time
reversal violating observables; these in turn may be sensitive, under some
particular conditions, to possible contributions beyond the standard model. Our
main result is that one can extract such observables even after integrating the
differential decay width over almost all of the available angles. Moreover we
find that the correlations based exclusively on momenta are quite general,
since they provide as much information as those involving one or more spins. We
generalize some methods already proposed in the literature for particular decay
channels, but we also pick out a new kind of time reversal violating
observables. Our analysis could be applied, for example, to data of LHCb
experiment.
| [
{
"created": "Thu, 3 May 2012 16:27:40 GMT",
"version": "v1"
}
] | 2012-06-20 | [
[
"Ajaltouni",
"Z. J.",
""
],
[
"Di Salvo",
"E.",
""
]
] | We propose some methods for studying hadronic sequential two-body decays involving more spinning particles. It relies on the analysis of T-odd and T-even asymmetries, which are related to interference terms. The latter asymmetries turn out to be as useful as the former ones in inferring time reversal violating observables; these in turn may be sensitive, under some particular conditions, to possible contributions beyond the standard model. Our main result is that one can extract such observables even after integrating the differential decay width over almost all of the available angles. Moreover we find that the correlations based exclusively on momenta are quite general, since they provide as much information as those involving one or more spins. We generalize some methods already proposed in the literature for particular decay channels, but we also pick out a new kind of time reversal violating observables. Our analysis could be applied, for example, to data of LHCb experiment. |
hep-ph/9711515 | David Ward | David Ward (Cavendish Laboratory, University of Cambridge) | Tests of the Standard Model: W mass and WWZ Couplings | 14 Pages. 12 figures. Review talk at the International Europhysics
Conference on High Energy Physics, Jerusalem, 19-26 August 1997 | null | null | null | hep-ph | null | Recent tests of the electroweak Standard Model are reviewed, covering the
precise measurements of Z decays at LEP I and SLC and measurements of fermion
pair production at higher energies at LEP II. Special emphasis is given to new
results on W physics from LEP and FNAL.
| [
{
"created": "Fri, 28 Nov 1997 16:56:15 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Ward",
"David",
"",
"Cavendish Laboratory, University of Cambridge"
]
] | Recent tests of the electroweak Standard Model are reviewed, covering the precise measurements of Z decays at LEP I and SLC and measurements of fermion pair production at higher energies at LEP II. Special emphasis is given to new results on W physics from LEP and FNAL. |
1001.5398 | Pasquini Barbara | B. Pasquini (Pavia U. & INFN, Pavia) and F. Yuan (LBL, Berkeley &
Riken BNL) | Sivers and Boer-Mulders functions in Light-Cone Quark Models | references and explanations added; version to appear in Phys. Rev. D | Phys.Rev.D81:114013,2010 | 10.1103/PhysRevD.81.114013 | null | hep-ph hep-ex hep-th nucl-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Results for the naive-time-reversal-odd quark distributions in a light-cone
quark model are presented. The final-state interaction effects are generated
via single-gluon exchange mechanism. The formalism of light-cone wave functions
is used to derive general expressions in terms of overlap of wave-function
amplitudes describing the different orbital angular momentum components of the
nucleon. In particular, the model predictions show a dominant contribution from
S- and P-wave interference in the Sivers function and a significant
contribution also from the interference of P and D waves in the Boer-Mulders
function. The favourable comparison with existing phenomenological
parametrizations motivates further applications to describe azimuthal
asymmetries in hadronic reactions.
| [
{
"created": "Fri, 29 Jan 2010 13:06:57 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Jun 2010 07:16:53 GMT",
"version": "v2"
}
] | 2014-11-20 | [
[
"Pasquini",
"B.",
"",
"Pavia U. & INFN, Pavia"
],
[
"Yuan",
"F.",
"",
"LBL, Berkeley &\n Riken BNL"
]
] | Results for the naive-time-reversal-odd quark distributions in a light-cone quark model are presented. The final-state interaction effects are generated via single-gluon exchange mechanism. The formalism of light-cone wave functions is used to derive general expressions in terms of overlap of wave-function amplitudes describing the different orbital angular momentum components of the nucleon. In particular, the model predictions show a dominant contribution from S- and P-wave interference in the Sivers function and a significant contribution also from the interference of P and D waves in the Boer-Mulders function. The favourable comparison with existing phenomenological parametrizations motivates further applications to describe azimuthal asymmetries in hadronic reactions. |
1101.3886 | Igor Dyatlov Tichonovitch | I. T. Dyatlov | Nonstandard Origin of the Standard Electroweak Currents | 20 pages, no figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Implications are considered of the hypothesis that the symplectic group
$Sp(n/2)$ is the spontaneously violated gauge group of n lepton flavors.
Invariant Majorana masses are impossible in $Sp(n/2)$. For the local gauge
symmetry $Sp(n/2)$ the dynamical spontaneous violation is only achievable for
the number of flavors $n=6$ with simultaneous parity ($R,L-$symmetry)
violation. The see-saw mechanism produces here three light and three heavy
Dirac neutrinos. Majorana states are unavailable here. Neglecting heavy
particles in the $R,L-$symmetric system of weak and electromagnetic
interactions ($R,L-$independent values of isospins Tw and hypercharges $Y$ for
leptons or quarks) leads to a theory with parity nonconservation and axial
anomalies. Only weak left $(L)$ and full $(R+L)$ electromagnetic currents do
not have anomalies and remain independent of the physics of heavy masses. These
currents are the ones of the Standard Model. The absence of anomalies merely in
the combination of currents forming the electromagnetic one presents essential
difference with the SM case, where the both, left $T_W$ and $Y$, currents are
deprived of anomalies independently.
| [
{
"created": "Thu, 20 Jan 2011 12:49:06 GMT",
"version": "v1"
},
{
"created": "Sat, 5 Mar 2011 09:18:45 GMT",
"version": "v2"
}
] | 2011-03-08 | [
[
"Dyatlov",
"I. T.",
""
]
] | Implications are considered of the hypothesis that the symplectic group $Sp(n/2)$ is the spontaneously violated gauge group of n lepton flavors. Invariant Majorana masses are impossible in $Sp(n/2)$. For the local gauge symmetry $Sp(n/2)$ the dynamical spontaneous violation is only achievable for the number of flavors $n=6$ with simultaneous parity ($R,L-$symmetry) violation. The see-saw mechanism produces here three light and three heavy Dirac neutrinos. Majorana states are unavailable here. Neglecting heavy particles in the $R,L-$symmetric system of weak and electromagnetic interactions ($R,L-$independent values of isospins Tw and hypercharges $Y$ for leptons or quarks) leads to a theory with parity nonconservation and axial anomalies. Only weak left $(L)$ and full $(R+L)$ electromagnetic currents do not have anomalies and remain independent of the physics of heavy masses. These currents are the ones of the Standard Model. The absence of anomalies merely in the combination of currents forming the electromagnetic one presents essential difference with the SM case, where the both, left $T_W$ and $Y$, currents are deprived of anomalies independently. |
hep-ph/0606300 | Tom\'a\v{s} Brauner | Tomas Brauner | Spontaneous symmetry breaking in strong and electroweak interactions | 57 pages, PhD thesis | null | null | null | hep-ph | null | This is the introduction to the PhD thesis, defended in June 2006. In the
original form it was appended with the reprints of the author's published
papers, and is to be regarded as their summary. Full details may be found in
the quoted papers.
| [
{
"created": "Thu, 29 Jun 2006 11:25:15 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Brauner",
"Tomas",
""
]
] | This is the introduction to the PhD thesis, defended in June 2006. In the original form it was appended with the reprints of the author's published papers, and is to be regarded as their summary. Full details may be found in the quoted papers. |
hep-ph/0202014 | Masahiro Kawasaki | Masahiro Kawasaki | Moduli problem and Q-ball baryogenesis in gauge-mediated SUSY breaking
models | 12pages, 3 figures, Proceedings of COSMO-01 Rovaniemi | null | null | null | hep-ph | null | We investigate whether the Affleck-Dine mechanism can produce sufficient
baryon number of the universe in the gauge-mediated SUSY breaking models, while
evading the cosmological moduli problem by late-time entropy production. We
find that the Q-ball formation makes the scenario difficult, irrespective of
the detail mechanism of the entropy production.
| [
{
"created": "Mon, 4 Feb 2002 06:12:58 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kawasaki",
"Masahiro",
""
]
] | We investigate whether the Affleck-Dine mechanism can produce sufficient baryon number of the universe in the gauge-mediated SUSY breaking models, while evading the cosmological moduli problem by late-time entropy production. We find that the Q-ball formation makes the scenario difficult, irrespective of the detail mechanism of the entropy production. |
1511.02477 | Alexei P. Martynenko | A.V. Eskin, R.N. Faustov, A.P. Martynenko, F.A. Martynenko | Hadronic deuteron polarizability contribution to the Lamb shift in
muonic deuterium | 12 pages, 2 figures | Mod. Phys. Lett. A, Vol. 31, No. 18 (2016) 1650104 | 10.1142/S0217732316501042 | SSU-HEP-15/11 | hep-ph quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Hadronic deuteron polarizability correction to the Lamb shift of muonic
deuterium is calculated on the basis of unitary isobar model and modern
experimental data on the structure functions of deep inelastic lepton-deuteron
scattering and their parameterizations in the resonance and nonresonance
regions.
| [
{
"created": "Sun, 8 Nov 2015 12:43:46 GMT",
"version": "v1"
},
{
"created": "Sun, 3 Jan 2016 18:41:38 GMT",
"version": "v2"
},
{
"created": "Sun, 28 Feb 2016 19:22:11 GMT",
"version": "v3"
}
] | 2016-06-14 | [
[
"Eskin",
"A. V.",
""
],
[
"Faustov",
"R. N.",
""
],
[
"Martynenko",
"A. P.",
""
],
[
"Martynenko",
"F. A.",
""
]
] | Hadronic deuteron polarizability correction to the Lamb shift of muonic deuterium is calculated on the basis of unitary isobar model and modern experimental data on the structure functions of deep inelastic lepton-deuteron scattering and their parameterizations in the resonance and nonresonance regions. |
hep-ph/0409176 | Nikolaos Stefanis | N. G. Stefanis, A. P. Bakulev, S. V. Mikhailov, K.
Passek-Kumeri\v{c}ki, W. Schroers | Pion structure: from nonlocal condensates to NLO analytic perturbation
theory | 9 pages, 4 figures consisting of 6 eps files. Needs hsqcd.cls.
Invited plenary talk presented by the first author at Hadron Structure and
QCD: from Low to High Energies, St. Petersburg, Repino, Russia, 18-22 May
2004 | null | null | RUB-TPII-04/04 | hep-ph | null | A pion distribution amplitude, derived from nonlocal QCD sum rules, has been
employed to calculate $F_{\gamma^*\gamma\to\pi}(Q^2)$ using light-cone sum
rules, and $F_{\pi}(Q^2)$ in NLO QCD perturbation theory. Predictions are
presented for both observables and found to be in good agreement with the
corresponding data. Calculating the hard pion form factor by Analytic
Perturbation Theory to two-loop order, it is shown that the
renormalization-scheme and scale-setting dependencies are diminished.
| [
{
"created": "Wed, 15 Sep 2004 17:41:43 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Stefanis",
"N. G.",
""
],
[
"Bakulev",
"A. P.",
""
],
[
"Mikhailov",
"S. V.",
""
],
[
"Passek-Kumerički",
"K.",
""
],
[
"Schroers",
"W.",
""
]
] | A pion distribution amplitude, derived from nonlocal QCD sum rules, has been employed to calculate $F_{\gamma^*\gamma\to\pi}(Q^2)$ using light-cone sum rules, and $F_{\pi}(Q^2)$ in NLO QCD perturbation theory. Predictions are presented for both observables and found to be in good agreement with the corresponding data. Calculating the hard pion form factor by Analytic Perturbation Theory to two-loop order, it is shown that the renormalization-scheme and scale-setting dependencies are diminished. |
hep-ph/9711280 | Mikolaj Misiak | Konstantin Chetyrkin, Mikolaj Misiak and Manfred Muenz | |Delta F| = 1 Nonleptonic Effective Hamiltonian in a Simpler Scheme | 21 pages, 7 figures, uses epsf.sty | Nucl.Phys.B520:279-297,1998 | 10.1016/S0550-3213(98)00131-X | MPI/PhT/97-51, TTP97-44, ZU-TH-17/97, TUM-HEP-285/97, IFT-12/97 | hep-ph | null | We consider |\Delta F| = 1 (F = S,C or B) nonleptonic effective hamiltonian
in a renormalization scheme which allows to consistently use fully
anticommuting gamma_5 at any number of loops, but at the leading order in the
Fermi coupling G_F. We calculate two-loop anomalous dimensions and one-loop
matching conditions for the effective operators in this scheme. Finally, we
transform our results to one of the previously used renormalization schemes,
and find agreement with the original calculations.
| [
{
"created": "Mon, 10 Nov 1997 21:52:33 GMT",
"version": "v1"
}
] | 2011-01-27 | [
[
"Chetyrkin",
"Konstantin",
""
],
[
"Misiak",
"Mikolaj",
""
],
[
"Muenz",
"Manfred",
""
]
] | We consider |\Delta F| = 1 (F = S,C or B) nonleptonic effective hamiltonian in a renormalization scheme which allows to consistently use fully anticommuting gamma_5 at any number of loops, but at the leading order in the Fermi coupling G_F. We calculate two-loop anomalous dimensions and one-loop matching conditions for the effective operators in this scheme. Finally, we transform our results to one of the previously used renormalization schemes, and find agreement with the original calculations. |
hep-ph/0402023 | Maxim Pospelov | Oleg Lebedev, Keith A. Olive, Maxim Pospelov and Adam Ritz | Probing CP Violation with the Deuteron Electric Dipole Moment | 5 pages, 4 figures; precision estimates clarified, to appear in Phys.
Rev. D | Phys.Rev.D70:016003,2004 | 10.1103/PhysRevD.70.016003 | UVIC-TH-03-10, DESY 04-020, CERN-PH-TH/2004-017, UMN-TH-2229/04 | hep-ph nucl-th | null | We present an analysis of the electric dipole moment (EDM) of the deuteron as
induced by CP-violating operators of dimension 4, 5 and 6 including theta QCD,
the EDMs and color EDMs of quarks, four-quark interactions and the Weinberg
operator. We demonstrate that the precision goal of the EDM Collaboration's
proposal to search for the deuteron EDM, (1-3)\times 10^{-27} e cm, will
provide an improvement in sensitivity to these sources of one-two orders of
magnitude relative to the existing bounds. We consider in detail the level to
which CP-odd phases can be probed within the MSSM.
| [
{
"created": "Mon, 2 Feb 2004 19:04:42 GMT",
"version": "v1"
},
{
"created": "Tue, 4 May 2004 08:46:18 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Lebedev",
"Oleg",
""
],
[
"Olive",
"Keith A.",
""
],
[
"Pospelov",
"Maxim",
""
],
[
"Ritz",
"Adam",
""
]
] | We present an analysis of the electric dipole moment (EDM) of the deuteron as induced by CP-violating operators of dimension 4, 5 and 6 including theta QCD, the EDMs and color EDMs of quarks, four-quark interactions and the Weinberg operator. We demonstrate that the precision goal of the EDM Collaboration's proposal to search for the deuteron EDM, (1-3)\times 10^{-27} e cm, will provide an improvement in sensitivity to these sources of one-two orders of magnitude relative to the existing bounds. We consider in detail the level to which CP-odd phases can be probed within the MSSM. |
hep-ph/0003063 | Ryuichiro Kitano | Ryuichiro Kitano and Katsuji Yamamoto | Lepton flavor violation in the supersymmetric standard model with
vectorlike leptons | 25 pages, 5 figures, comments about K0-K0bar mixing added | Phys.Rev. D62 (2000) 073007 | 10.1103/PhysRevD.62.073007 | KEK-TH-681 | hep-ph | null | Lepton flavor violating processes are obtained from the mixing between
ordinary leptons and vectorlike SU(2)_L doublet leptons which may originate in
E_6. The effects of this lepton mixing are, however, suppressed naturally by
the hierarchy of the charged lepton masses. In the supersymmetric model,
significant effects of lepton flavor violation may appear rather through
slepton mixing, which is in the present case generated by radiative corrections
with ordinary-exotic lepton couplings. We are especially interested in the mu
-> e gamma decay. In the model without the bare mass term of vectorlike
leptons, the supersymmetric contributions are rather suppressed due to the
approximate U(1)_e X U(1)_mu. It is, however, remarkable that they are
substantially enhanced by tan^6 beta. Then, B(mu -> e gamma) might be
comparable to the experimental bound for large tan beta. In the model with the
bare mass term, much larger contributions are obtained through slepton mixing.
These investigations show that the supersymmetric effects on lepton flavor
violation due to the vectorlike leptons can be observed in the near future
experiments.
| [
{
"created": "Wed, 8 Mar 2000 11:03:12 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Aug 2000 05:47:29 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Kitano",
"Ryuichiro",
""
],
[
"Yamamoto",
"Katsuji",
""
]
] | Lepton flavor violating processes are obtained from the mixing between ordinary leptons and vectorlike SU(2)_L doublet leptons which may originate in E_6. The effects of this lepton mixing are, however, suppressed naturally by the hierarchy of the charged lepton masses. In the supersymmetric model, significant effects of lepton flavor violation may appear rather through slepton mixing, which is in the present case generated by radiative corrections with ordinary-exotic lepton couplings. We are especially interested in the mu -> e gamma decay. In the model without the bare mass term of vectorlike leptons, the supersymmetric contributions are rather suppressed due to the approximate U(1)_e X U(1)_mu. It is, however, remarkable that they are substantially enhanced by tan^6 beta. Then, B(mu -> e gamma) might be comparable to the experimental bound for large tan beta. In the model with the bare mass term, much larger contributions are obtained through slepton mixing. These investigations show that the supersymmetric effects on lepton flavor violation due to the vectorlike leptons can be observed in the near future experiments. |
2011.06599 | Cari Cesarotti | Cari Cesarotti, Matthew Reece, Matthew J. Strassler | The Efficacy of Event Isotropy as an Event Shape Observable | 31 pages, 19 figures | null | 10.1007/JHEP07(2021)215 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Event isotropy $\mathcal{I}^\text{sph}$, an event shape observable that
measures the distance of a final state from a spherically symmetric state, is
designed for new physics signals that are far from QCD-like. Using a new
technique for producing a wide variety of signals that can range from
near-spherical to jetty, we compare event isotropy to other observables. We
show that thrust $T$ and the $C$ parameter (and $\lambda_\text{max}$, the
largest eigenvalue of the sphericity matrix) are strongly correlated and thus
redundant, to a good approximation. By contrast, event isotropy adds
considerable information, often serving to break degeneracies between signals
that would have almost identical $T$ and $C$ distributions. Signals with broad
distributions in $T$ (or $\lambda_\text{max}$) and in $\mathcal{I}^\text{sph}$
separately often have much narrower distributions, and are more easily
distinguished, in the $({\mathcal{I}^\text{sph}},\lambda_\text{max})$ plane. An
intuitive, semi-analytic estimation technique clarifies why this is the case
and assists with the interpretation of the distributions.
| [
{
"created": "Thu, 12 Nov 2020 19:00:00 GMT",
"version": "v1"
}
] | 2021-08-18 | [
[
"Cesarotti",
"Cari",
""
],
[
"Reece",
"Matthew",
""
],
[
"Strassler",
"Matthew J.",
""
]
] | Event isotropy $\mathcal{I}^\text{sph}$, an event shape observable that measures the distance of a final state from a spherically symmetric state, is designed for new physics signals that are far from QCD-like. Using a new technique for producing a wide variety of signals that can range from near-spherical to jetty, we compare event isotropy to other observables. We show that thrust $T$ and the $C$ parameter (and $\lambda_\text{max}$, the largest eigenvalue of the sphericity matrix) are strongly correlated and thus redundant, to a good approximation. By contrast, event isotropy adds considerable information, often serving to break degeneracies between signals that would have almost identical $T$ and $C$ distributions. Signals with broad distributions in $T$ (or $\lambda_\text{max}$) and in $\mathcal{I}^\text{sph}$ separately often have much narrower distributions, and are more easily distinguished, in the $({\mathcal{I}^\text{sph}},\lambda_\text{max})$ plane. An intuitive, semi-analytic estimation technique clarifies why this is the case and assists with the interpretation of the distributions. |
0910.3704 | Eric S. Swanson | E.S. Swanson | Hadron Spectroscopy -- Theory | To be published in the proceedings of DPF-2009, Detroit, MI, July
2009, eConf C090726. Additional references added | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A brief review of theoretical progress in hadron spectroscopy and
nonperturbative QCD is presented. Attention is focussed on recent lattice gauge
theory, the Dyson-Schwinger formalism, effective field theory, unquenching
constituent models, and some beyond the Standard Model physics.
| [
{
"created": "Mon, 19 Oct 2009 21:21:04 GMT",
"version": "v1"
},
{
"created": "Fri, 30 Oct 2009 17:57:04 GMT",
"version": "v2"
}
] | 2009-10-30 | [
[
"Swanson",
"E. S.",
""
]
] | A brief review of theoretical progress in hadron spectroscopy and nonperturbative QCD is presented. Attention is focussed on recent lattice gauge theory, the Dyson-Schwinger formalism, effective field theory, unquenching constituent models, and some beyond the Standard Model physics. |
hep-ph/9704440 | Leonid Burakovsky | L. Burakovsky, T. Goldman and L.P. Horwitz | New Mass Relations for Heavy Quarkonia | 10 pages, LaTeX | Phys.Rev.D56:7119-7123,1997 | 10.1103/PhysRevD.56.7119 | LA-UR-97-1494 | hep-ph | null | By assuming the existence of (quasi)-linear Regge trajectories for heavy
quarkonia in the low energy region, we derive a new, sixth power, meson mass
relation which shows good agreement with experiment for both charmed and beauty
mesons. This relation may be reduced to a quadratic Gell-Mann-Okubo type
formula by fitting the values of the Regge slopes of these (quasi)-linear
trajectories. For charmed mesons, such a formula holds with an accuracy of
$\sim 1$%, and is in qualitative agreement with the relation obtained
previously by the application of the linear spectrum to a meson hexadecuplet.
| [
{
"created": "Tue, 29 Apr 1997 18:21:45 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Burakovsky",
"L.",
""
],
[
"Goldman",
"T.",
""
],
[
"Horwitz",
"L. P.",
""
]
] | By assuming the existence of (quasi)-linear Regge trajectories for heavy quarkonia in the low energy region, we derive a new, sixth power, meson mass relation which shows good agreement with experiment for both charmed and beauty mesons. This relation may be reduced to a quadratic Gell-Mann-Okubo type formula by fitting the values of the Regge slopes of these (quasi)-linear trajectories. For charmed mesons, such a formula holds with an accuracy of $\sim 1$%, and is in qualitative agreement with the relation obtained previously by the application of the linear spectrum to a meson hexadecuplet. |
hep-ph/9912340 | Sharon Jensen | Stanley J. Brodsky | New Directions in Quantum Chromodynamics | Invited talk at International Summer School on Particle Production
Spanning MeV and TeV Energies (Nijmegen 99), August 1999 | null | null | SLAC-PUB-8315 | hep-ph | null | Several topics in QCD are reviewed, including: the light-cone Fock state
representation, which encodes the flavor, spin and other quark and gluon
correlations of hadrons in the form of universal process-independent
amplitudes; the light-cone factorization scheme for inclusive and exclusive
processes; the application of the light-cone formalism to semi-leptonic B decay
amplitudes; self-resolving diffractive interactions as a tool for measuring
light-cone wavefunctions; and the use of conformal symmetry as a template for
QCD predictions, such as commensurate scale relations, which relate observable
to observable at fixed relative scale without renormalization scale or scheme
ambiguities.
| [
{
"created": "Tue, 14 Dec 1999 16:45:07 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Brodsky",
"Stanley J.",
""
]
] | Several topics in QCD are reviewed, including: the light-cone Fock state representation, which encodes the flavor, spin and other quark and gluon correlations of hadrons in the form of universal process-independent amplitudes; the light-cone factorization scheme for inclusive and exclusive processes; the application of the light-cone formalism to semi-leptonic B decay amplitudes; self-resolving diffractive interactions as a tool for measuring light-cone wavefunctions; and the use of conformal symmetry as a template for QCD predictions, such as commensurate scale relations, which relate observable to observable at fixed relative scale without renormalization scale or scheme ambiguities. |
2302.05719 | Rui Zhu | Lei Wang, Jin Min Yang, Yang Zhang, Pengxuan Zhu, Rui Zhu | A concise review on some Higgs-related new physics models in light of
current experiments | 25 pages, 11 figures, 1 table, an invited review for Universe,
published version | null | 10.3390/universe9040178 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Higgs boson may serve as a portal to new physics beyond the standard model
(BSM) which is implied by theoretical naturalness or experimental anomalies. In
this note we briefly survey some Higgs-related BSM physics models, including
the low energy SUSY (focusing on the minimal SUSY model), the little Higgs
models, the two-Higgs-doublet models and the simplest singlet extensions of the
Higgs sector. For each illustrated BSM model, we emphatically elucidate its
phenomenological power in explaining current measurements of the muon g-2, the
W-boson mass and the dark matter. For the singlet extensions like the xSM and
2HDM+S, we discuss the induced cosmic phase transition and the dark matter
relic density as well as the vacuum stability. Finally, we give an outlook.
| [
{
"created": "Sat, 11 Feb 2023 15:24:31 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Apr 2023 14:05:13 GMT",
"version": "v2"
}
] | 2023-04-14 | [
[
"Wang",
"Lei",
""
],
[
"Yang",
"Jin Min",
""
],
[
"Zhang",
"Yang",
""
],
[
"Zhu",
"Pengxuan",
""
],
[
"Zhu",
"Rui",
""
]
] | Higgs boson may serve as a portal to new physics beyond the standard model (BSM) which is implied by theoretical naturalness or experimental anomalies. In this note we briefly survey some Higgs-related BSM physics models, including the low energy SUSY (focusing on the minimal SUSY model), the little Higgs models, the two-Higgs-doublet models and the simplest singlet extensions of the Higgs sector. For each illustrated BSM model, we emphatically elucidate its phenomenological power in explaining current measurements of the muon g-2, the W-boson mass and the dark matter. For the singlet extensions like the xSM and 2HDM+S, we discuss the induced cosmic phase transition and the dark matter relic density as well as the vacuum stability. Finally, we give an outlook. |
1708.03528 | Markus Diehl | Maarten G. A. Buffing, Markus Diehl and Tomas Kasemets | Transverse momentum in double parton scattering: factorisation,
evolution and matching | 125 pages, 14 figures. v2: additional discussion, especially in
sections 6.2 and 8. v3: added erratum (main body of paper unchanged). v4:
corrected mistake in text before equation (I.23) | null | 10.1007/JHEP01(2018)044 | NIKHEF 2016-028, DESY 17-014 | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We give a description of double parton scattering with measured transverse
momenta in the final state, extending the formalism for factorisation and
resummation developed by Collins, Soper and Sterman for the production of
colourless particles. After a detailed analysis of their colour structure, we
derive and solve evolution equations in rapidity and renormalisation scale for
the relevant soft factors and double parton distributions. We show how in the
perturbative regime, transverse momentum dependent double parton distributions
can be expressed in terms of simpler nonperturbative quantities and compute
several of the corresponding perturbative kernels at one-loop accuracy. We then
show how the coherent sum of single and double parton scattering can be
simplified for perturbatively large transverse momenta, and we discuss to which
order resummation can be performed with presently available results. As an
auxiliary result, we derive a simple form for the square root factor in the
Collins construction of transverse momentum dependent parton distributions.
| [
{
"created": "Fri, 11 Aug 2017 13:00:25 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Jan 2018 19:36:55 GMT",
"version": "v2"
},
{
"created": "Fri, 7 May 2021 11:52:26 GMT",
"version": "v3"
},
{
"created": "Mon, 14 Jun 2021 08:21:08 GMT",
"version": "v4"
}
] | 2021-06-15 | [
[
"Buffing",
"Maarten G. A.",
""
],
[
"Diehl",
"Markus",
""
],
[
"Kasemets",
"Tomas",
""
]
] | We give a description of double parton scattering with measured transverse momenta in the final state, extending the formalism for factorisation and resummation developed by Collins, Soper and Sterman for the production of colourless particles. After a detailed analysis of their colour structure, we derive and solve evolution equations in rapidity and renormalisation scale for the relevant soft factors and double parton distributions. We show how in the perturbative regime, transverse momentum dependent double parton distributions can be expressed in terms of simpler nonperturbative quantities and compute several of the corresponding perturbative kernels at one-loop accuracy. We then show how the coherent sum of single and double parton scattering can be simplified for perturbatively large transverse momenta, and we discuss to which order resummation can be performed with presently available results. As an auxiliary result, we derive a simple form for the square root factor in the Collins construction of transverse momentum dependent parton distributions. |
hep-ph/9704216 | Ying Shuqian | S. Ying | Quasiparticles and the quantum fluctuations of local observables | 4 pages, RevTex, 1 figures in postscript | null | null | null | hep-ph hep-lat hep-th | null | The role that quasiparticles play in a strong interaction system with
spontaneous symmetry breaking is examined. We find, using a non- perturbative
cluster decomposition method, that the quasiparticles do not saturate the
physical local observables at small distances. The fermion number density
serves as a clearcut example. A component due to localized random quantum
fluctuations of the order parameter(s) in the vacuum state and the
contributions of ``quasiparticles'' corresponding to other local minima of the
effective potential is needed. At large distances, the ordinary quasiparticle
picture emerges in the response of the system to classical background fields
but the above mentioned component acts as a source for them.
| [
{
"created": "Wed, 2 Apr 1997 03:13:26 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Ying",
"S.",
""
]
] | The role that quasiparticles play in a strong interaction system with spontaneous symmetry breaking is examined. We find, using a non- perturbative cluster decomposition method, that the quasiparticles do not saturate the physical local observables at small distances. The fermion number density serves as a clearcut example. A component due to localized random quantum fluctuations of the order parameter(s) in the vacuum state and the contributions of ``quasiparticles'' corresponding to other local minima of the effective potential is needed. At large distances, the ordinary quasiparticle picture emerges in the response of the system to classical background fields but the above mentioned component acts as a source for them. |
1310.0426 | Joao Pulido | Joao Pulido and C.R.Das | Sterile neutrinos in the 3+s scenario and solar data | 7 pages, 4 figures, contribution to EPS Conference on High Energy
Physics-EPS-HEP2013, 18-24 July 2013, Stockholm, Sweden | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The flatness of the SuperKamiokande neutrino electron scattering spectrum and
the apparent downturn of the charged current spectrum in the SNO data which the
Large Mixing Angle solution (LMA) to the solar neutrino problem fails to
predict are analysed in the context of an extension to the standard electroweak
model with light sterile neutrinos. It is found that a sterile neutrino which
is quasi degenerate with the active ones with $\Delta m^2_{41}=10^{-5}eV^2$ and
mixing $sin\theta_{14}=0.04$ provides a suitable improvement to the LMA data
fits.
| [
{
"created": "Tue, 1 Oct 2013 18:55:44 GMT",
"version": "v1"
}
] | 2013-10-02 | [
[
"Pulido",
"Joao",
""
],
[
"Das",
"C. R.",
""
]
] | The flatness of the SuperKamiokande neutrino electron scattering spectrum and the apparent downturn of the charged current spectrum in the SNO data which the Large Mixing Angle solution (LMA) to the solar neutrino problem fails to predict are analysed in the context of an extension to the standard electroweak model with light sterile neutrinos. It is found that a sterile neutrino which is quasi degenerate with the active ones with $\Delta m^2_{41}=10^{-5}eV^2$ and mixing $sin\theta_{14}=0.04$ provides a suitable improvement to the LMA data fits. |
hep-ph/9511446 | Kaladi Babu | K.S. Babu (IAS) and S.M. Barr (Bartol) | Large neutrino mixing angles in unified theories | 16 pages, Plain LaTeX, no figures | Phys.Lett.B381:202-208,1996 | 10.1016/0370-2693(96)00552-7 | IASSNS-HEP 95/100, BA-95-56 | hep-ph | null | Typically in unified theories the neutrino mixing angles, like the
Cabibbo-Kobayashi-Maskawa (CKM) angles of the quarks, are related to the small
mass ratios between fermions of different generations and are therefore quite
small. A new approach for explaining the intergenerational mass hierarchies is
proposed here which, while giving small CKM angles, naturally leads to neutrino
angles of order unity. Such large mixing angles may be required for a
resolution of the atmospheric neutrino anomaly and may also be relevant for the
solar neutrino puzzle. The mechanism presented here provides a framework in
which novel approaches to the fermion mass question can arise. In particular,
within this framework a variant of the texture idea allows highly predictive
models to be constructed, an illustrative example of which is given. It is
shown how the neutrino mixing angles may be completely determined in such
schemes.
| [
{
"created": "Wed, 29 Nov 1995 06:02:33 GMT",
"version": "v1"
}
] | 2011-05-12 | [
[
"Babu",
"K. S.",
"",
"IAS"
],
[
"Barr",
"S. M.",
"",
"Bartol"
]
] | Typically in unified theories the neutrino mixing angles, like the Cabibbo-Kobayashi-Maskawa (CKM) angles of the quarks, are related to the small mass ratios between fermions of different generations and are therefore quite small. A new approach for explaining the intergenerational mass hierarchies is proposed here which, while giving small CKM angles, naturally leads to neutrino angles of order unity. Such large mixing angles may be required for a resolution of the atmospheric neutrino anomaly and may also be relevant for the solar neutrino puzzle. The mechanism presented here provides a framework in which novel approaches to the fermion mass question can arise. In particular, within this framework a variant of the texture idea allows highly predictive models to be constructed, an illustrative example of which is given. It is shown how the neutrino mixing angles may be completely determined in such schemes. |
1112.1559 | Jan Uphoff | Jan Uphoff, Oliver Fochler, Zhe Xu, Carsten Greiner | Open heavy flavor at RHIC and LHC in a partonic transport model | 6 pages, 6 figures, talk given at the conference Strangeness in Quark
Matter 2011, Cracow, Poland | Acta Physica Polonica B Proceedings Supplement vol. 5 (2012) page
555 | 10.5506/APhysPolBSupp.5.555 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Heavy quarks are a unique probe to study the medium produced in
ultra-relativistic heavy ion collisions. Within the partonic transport model
Boltzmann approach to multi-parton scatterings (BAMPS) the production, energy
loss and elliptic flow of heavy quarks are investigated in 3+1 dimensional
simulations of the quark gluon plasma evolution. With only binary interactions
between heavy quarks and particles from the medium calculated within
perturbative QCD, the results on elliptic flow and the nuclear modification
factor are not compatible with experimental data from RHIC and LHC. However, if
the binary cross section is multiplied with K=4 both the elliptic flow and the
nuclear modification factor are simultaneously described at RHIC and also LHC.
Furthermore, preliminary results are presented that the implementation of
radiative processes leads to a stronger suppression which agrees well with the
measured nuclear modification factor at RHIC without the need of any K factor.
| [
{
"created": "Wed, 7 Dec 2011 13:51:27 GMT",
"version": "v1"
}
] | 2012-04-20 | [
[
"Uphoff",
"Jan",
""
],
[
"Fochler",
"Oliver",
""
],
[
"Xu",
"Zhe",
""
],
[
"Greiner",
"Carsten",
""
]
] | Heavy quarks are a unique probe to study the medium produced in ultra-relativistic heavy ion collisions. Within the partonic transport model Boltzmann approach to multi-parton scatterings (BAMPS) the production, energy loss and elliptic flow of heavy quarks are investigated in 3+1 dimensional simulations of the quark gluon plasma evolution. With only binary interactions between heavy quarks and particles from the medium calculated within perturbative QCD, the results on elliptic flow and the nuclear modification factor are not compatible with experimental data from RHIC and LHC. However, if the binary cross section is multiplied with K=4 both the elliptic flow and the nuclear modification factor are simultaneously described at RHIC and also LHC. Furthermore, preliminary results are presented that the implementation of radiative processes leads to a stronger suppression which agrees well with the measured nuclear modification factor at RHIC without the need of any K factor. |
2203.09002 | Motoo Suzuki | Sudhakantha Girmohanta, Seung J. Lee, Yuichiro Nakai, Motoo Suzuki | A Natural Model of Spontaneous CP Violation | 9 pages, 5 figures, model updated, published version | null | 10.1007/JHEP12(2022)024 | YITP-SB-2022-10 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine the possibility of building a natural non-supersymmetric model of
spontaneous CP violation equipped with the Nelson-Barr (NB) mechanism to
address the strong CP problem. Our approach is to utilize a doubly composite
dynamics where the first confinement of the CFT occurs at the scale of
spontaneous CP violation (SCPV) and the second confinement at the TeV scale. A
holographic dual description of this 4D set-up via a warped extra dimension
with three 3-branes provides an explicit realization of this idea.In this
model, radiative corrections to the strong CP phase are well under control, and
the coincidence of mass scales, which we generally encounter in NB models, is
addressed. Our model also provides an explanation to the quark Yukawa
hierarchies, and a solution to the gauge hierarchy problem just as in the usual
Randall-Sundrum model with the Higgs being localized on the TeV brane.
| [
{
"created": "Thu, 17 Mar 2022 00:47:05 GMT",
"version": "v1"
},
{
"created": "Fri, 1 Apr 2022 08:43:49 GMT",
"version": "v2"
},
{
"created": "Thu, 24 Nov 2022 00:13:19 GMT",
"version": "v3"
}
] | 2022-12-28 | [
[
"Girmohanta",
"Sudhakantha",
""
],
[
"Lee",
"Seung J.",
""
],
[
"Nakai",
"Yuichiro",
""
],
[
"Suzuki",
"Motoo",
""
]
] | We examine the possibility of building a natural non-supersymmetric model of spontaneous CP violation equipped with the Nelson-Barr (NB) mechanism to address the strong CP problem. Our approach is to utilize a doubly composite dynamics where the first confinement of the CFT occurs at the scale of spontaneous CP violation (SCPV) and the second confinement at the TeV scale. A holographic dual description of this 4D set-up via a warped extra dimension with three 3-branes provides an explicit realization of this idea.In this model, radiative corrections to the strong CP phase are well under control, and the coincidence of mass scales, which we generally encounter in NB models, is addressed. Our model also provides an explanation to the quark Yukawa hierarchies, and a solution to the gauge hierarchy problem just as in the usual Randall-Sundrum model with the Higgs being localized on the TeV brane. |
2012.07925 | Ananya Mukherjee | Monojit Ghosh, Srubabati Goswami, and Ananya Mukherjee | Implications of the Dark-LMA solution for neutrino mass matrices | 18 pages, 5 figures. To appear in Nucl. Phys. B | null | 10.1016/j.nuclphysb.2021.115460 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we have re-investigated two different kinds of texture zero
ansatz of the low energy neutrino mass matrix in view of the
Dark-Large-Mixing-Angle (DLMA) solution of the solar neutrino problem which can
arise in the presence of non-standard interactions. In particular we revisit
the cases of (i) one zero mass matrices when the lowest neutrino mass is zero
and (ii) one zero texture with a vanishing minor. In our study we find that for
most of the cases, the texture zero conditions which are allowed for the LMA
solution, are also allowed for the DLMA solution. However, we found two
textures belonging to the case of one zero texture with a vanishing minor where
LMA solution does not give a viable solution whereas DLMA solution does. We
analyze all the possible texture zero cases belonging to these two kinds of
texture zero structures in detail and present correlations between different
parameters. We also present the predictions for the effective neutrino mass
governing neutrino-less double beta decay for the allowed textures.
| [
{
"created": "Mon, 14 Dec 2020 20:26:56 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Jun 2021 10:21:37 GMT",
"version": "v2"
}
] | 2021-07-07 | [
[
"Ghosh",
"Monojit",
""
],
[
"Goswami",
"Srubabati",
""
],
[
"Mukherjee",
"Ananya",
""
]
] | In this work we have re-investigated two different kinds of texture zero ansatz of the low energy neutrino mass matrix in view of the Dark-Large-Mixing-Angle (DLMA) solution of the solar neutrino problem which can arise in the presence of non-standard interactions. In particular we revisit the cases of (i) one zero mass matrices when the lowest neutrino mass is zero and (ii) one zero texture with a vanishing minor. In our study we find that for most of the cases, the texture zero conditions which are allowed for the LMA solution, are also allowed for the DLMA solution. However, we found two textures belonging to the case of one zero texture with a vanishing minor where LMA solution does not give a viable solution whereas DLMA solution does. We analyze all the possible texture zero cases belonging to these two kinds of texture zero structures in detail and present correlations between different parameters. We also present the predictions for the effective neutrino mass governing neutrino-less double beta decay for the allowed textures. |
hep-ph/9907316 | John Vergados | J.D. Vergados (Institute for Theoretical Physics, University of
Tuebingen, Tuebingen, Germany) | Neutrinoless Double Beta Decay in Gauge Theories | Latex, 24 pages, 1 postscript figure, uses iopconf.sty | Phys.Atom.Nucl.63:1137-1150,2000; Yad.Fiz.63N7:1213-1226,2000 | 10.1134/1.855759 | null | hep-ph nucl-th | null | Neutrinoless double beta decay is a very important process both from the
particle and nuclear physics point of view. Its observation will severely
constrain the existing models and signal that the neutrinos are massive
Majorana particles. From the elementary particle point of view it pops up in
almost every model. In addition to the traditional mechanisms, like the
neutrino mass, the admixture of right handed currents etc, it may occur due to
the R-parity violating supersymmetric (SUSY) interactions. From the nuclear
physics point of view it is challenging, because: 1) The relevant nuclei have
complicated nuclear structure. 2) The energetically allowed transitions are
exhaust a small part of all the strength. 3) One must cope with the short
distance behavior of the transition operators, especially when the intermediate
particles are heavy (eg in SUSY models). Thus novel effects, like the double
beta decay of pions in flight between nucleons, have to be considered. 4) The
intermediate momenta involved are about 100 MeV. Thus one has to take into
account possible momentum dependent terms in the nucleon current. We find that,
for the mass mechanism, such modifications of the nucleon current for light
neutrinos reduce the nuclear matrix elements by about 25 per cent, almost
regardless of the nuclear model. In the case of heavy neutrinos the effect is
much larger and model dependent.
Taking the above effects into account, the available nuclear matrix elements
for the experimentally interesting nuclei A = 76, 82, 96, 100, 116, 128, 130,
136 and 150 and the experimental limits on the life times we have extracted new
stringent limits on the average neutrino mass and on the R-parity violating
coupling for various SUSY models.
| [
{
"created": "Mon, 12 Jul 1999 19:30:46 GMT",
"version": "v1"
}
] | 2011-04-15 | [
[
"Vergados",
"J. D.",
"",
"Institute for Theoretical Physics, University of\n Tuebingen, Tuebingen, Germany"
]
] | Neutrinoless double beta decay is a very important process both from the particle and nuclear physics point of view. Its observation will severely constrain the existing models and signal that the neutrinos are massive Majorana particles. From the elementary particle point of view it pops up in almost every model. In addition to the traditional mechanisms, like the neutrino mass, the admixture of right handed currents etc, it may occur due to the R-parity violating supersymmetric (SUSY) interactions. From the nuclear physics point of view it is challenging, because: 1) The relevant nuclei have complicated nuclear structure. 2) The energetically allowed transitions are exhaust a small part of all the strength. 3) One must cope with the short distance behavior of the transition operators, especially when the intermediate particles are heavy (eg in SUSY models). Thus novel effects, like the double beta decay of pions in flight between nucleons, have to be considered. 4) The intermediate momenta involved are about 100 MeV. Thus one has to take into account possible momentum dependent terms in the nucleon current. We find that, for the mass mechanism, such modifications of the nucleon current for light neutrinos reduce the nuclear matrix elements by about 25 per cent, almost regardless of the nuclear model. In the case of heavy neutrinos the effect is much larger and model dependent. Taking the above effects into account, the available nuclear matrix elements for the experimentally interesting nuclei A = 76, 82, 96, 100, 116, 128, 130, 136 and 150 and the experimental limits on the life times we have extracted new stringent limits on the average neutrino mass and on the R-parity violating coupling for various SUSY models. |
1410.6478 | Stephane Munier | Stephane Munier | Lecture notes on "Quantum chromodynamics and statistical physics" | 58 pages, 32 figures. Lectures given at the Huada school on QCD,
Central China Normal University, Wuhan, China, June 2-13, 2014 | Science China Physics, Mechanics & Astronomy Vol. 58 No. 8: 081001
(2015) | 10.1007/s11433-015-5666-7 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The concepts and methods used for the study of disordered systems have proven
useful in the analysis of the evolution equations of quantum chromodynamics in
the high-energy regime: Indeed, parton branching in the semi-classical
approximation relevant at high energies is a peculiar branching-diffusion
process, and parton branching supplemented by saturation effects (such as gluon
recombination) is a reaction-diffusion process. In these lectures, we first
introduce the basic concepts in the context of simple toy models, we study the
properties of the latter, and show how the results obtained for the simple
models may be taken over to quantum chromodynamics.
| [
{
"created": "Thu, 23 Oct 2014 20:00:01 GMT",
"version": "v1"
}
] | 2015-07-06 | [
[
"Munier",
"Stephane",
""
]
] | The concepts and methods used for the study of disordered systems have proven useful in the analysis of the evolution equations of quantum chromodynamics in the high-energy regime: Indeed, parton branching in the semi-classical approximation relevant at high energies is a peculiar branching-diffusion process, and parton branching supplemented by saturation effects (such as gluon recombination) is a reaction-diffusion process. In these lectures, we first introduce the basic concepts in the context of simple toy models, we study the properties of the latter, and show how the results obtained for the simple models may be taken over to quantum chromodynamics. |
hep-ph/0504066 | Utpal Sarkar | Bipin R. Desai, G. Rajasekaran and U. Sarkar | Large neutrino mixing angles for type-I see-saw mechanism in SO(10) GUT | 8 pages | null | null | IMSc/2005/03/06, PRL-TH-05/02 | hep-ph | null | We consider the neutrino mixing angles in an SO(10) GUT with the usual Higgs
structure in which neutrino masses are explained by the type-I see-saw
mechanism. The Dirac-neutrino Yukawa matrix then has a structure similar to
that of the $u$-quark. We determine the light neutrino mass matrix through
type-I see-saw mechanism using the experimentally consistent $u$-quark Yukawa
matrix. We find that large neutrino mixing-angles emerge naturally in this
model.
| [
{
"created": "Fri, 8 Apr 2005 11:28:11 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Desai",
"Bipin R.",
""
],
[
"Rajasekaran",
"G.",
""
],
[
"Sarkar",
"U.",
""
]
] | We consider the neutrino mixing angles in an SO(10) GUT with the usual Higgs structure in which neutrino masses are explained by the type-I see-saw mechanism. The Dirac-neutrino Yukawa matrix then has a structure similar to that of the $u$-quark. We determine the light neutrino mass matrix through type-I see-saw mechanism using the experimentally consistent $u$-quark Yukawa matrix. We find that large neutrino mixing-angles emerge naturally in this model. |
2202.08354 | Fidele Twagirayezu | Fidele J. Twagirayezu | Effect of minimal length uncertainty on neutrino oscillation | 10 pages | null | 10.1515/zna-2022-0225 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | In this paper, we study the effect of the minimal length on neutrino
oscillation in a static magnetic field. In the framework of the generalized
uncertainty principle, we reformulate the Hamiltonian for a relativistic
neutrino moving in a magnetic field oriented along the z-direction of Cartesian
coordinates. Using the modified energy spectrum, we obtain the oscillation
probability for different neutrino flavors. In addition, we obtain the energy
differences for the neutrino-mass eigenstates. We find that the energy and
energy difference depend on the minimal length parameter {\alpha}, and the
energy difference becomes independent of {\alpha} when the magnetic field is
not present. In addition, we find that the modified probability of oscillation
differs from the usual probability of oscillation if a magnetic field is
present. Using the current experimental result, we estimate the upper bound on
the deformation parameter and the minimal length, and find that the upper bound
on the minimal length scale is less than the electroweak scale. If the minimal
length is at Planck scale, the minimal length formalism leads to the same
result as a quantum theory of gravity with an $SU(2)_{L} \times U(1)$ effective
invariant dimension-5 Lagrangian including neutrino and Higgs fields.
| [
{
"created": "Tue, 15 Feb 2022 08:17:38 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Mar 2023 17:54:01 GMT",
"version": "v2"
}
] | 2023-05-31 | [
[
"Twagirayezu",
"Fidele J.",
""
]
] | In this paper, we study the effect of the minimal length on neutrino oscillation in a static magnetic field. In the framework of the generalized uncertainty principle, we reformulate the Hamiltonian for a relativistic neutrino moving in a magnetic field oriented along the z-direction of Cartesian coordinates. Using the modified energy spectrum, we obtain the oscillation probability for different neutrino flavors. In addition, we obtain the energy differences for the neutrino-mass eigenstates. We find that the energy and energy difference depend on the minimal length parameter {\alpha}, and the energy difference becomes independent of {\alpha} when the magnetic field is not present. In addition, we find that the modified probability of oscillation differs from the usual probability of oscillation if a magnetic field is present. Using the current experimental result, we estimate the upper bound on the deformation parameter and the minimal length, and find that the upper bound on the minimal length scale is less than the electroweak scale. If the minimal length is at Planck scale, the minimal length formalism leads to the same result as a quantum theory of gravity with an $SU(2)_{L} \times U(1)$ effective invariant dimension-5 Lagrangian including neutrino and Higgs fields. |
0712.0095 | Anibal Medina | Marcela Carena, Anibal D. Medina, Boris Panes, Nausheen R. Shah and
Carlos E.M. Wagner | Collider Phenomenology of Gauge-Higgs Unification Scenarios in Warped
Extra Dimensions | 40 pages, 20 figures | Phys.Rev.D77:076003,2008 | 10.1103/PhysRevD.77.076003 | ANL-HEP-PR-07-101, EFI-07-35, FERMILAB-PUB-07-630-T | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute the couplings of the zero modes and first excited states of
gluons, $W$'s, $Z$ gauge bosons, as well as the Higgs, to the zero modes and
first excited states of the third generation quarks, in an RS Gauge-Higgs
unification scenario based on a bulk $SO(5)\times U(1)_X$ gauge symmetry, with
gauge and fermion fields propagating in the bulk. Using the parameter space
consistent with electroweak precision tests and radiative electroweak symmetry
breaking, we study numerically the dependence of these couplings on the
parameters of our model. Furthermore, after emphasizing the presence of light
excited states of the top quark, which couple strongly to the Kaluza Klein
gauge bosons, the associated collider phenomenology is analyzed. In particular,
we concentrate on the possible detection of the first excited state of the top,
$t^1$, which tends to have a higher mass than the ones accessible via regular
QCD production processes. We stress that the detection of these particles is
still possible due to an increase in the pair production of $t^1$ induced by
the first excited state of the gluon, $G^1$.
| [
{
"created": "Sat, 1 Dec 2007 17:19:57 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Jul 2008 17:44:14 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Carena",
"Marcela",
""
],
[
"Medina",
"Anibal D.",
""
],
[
"Panes",
"Boris",
""
],
[
"Shah",
"Nausheen R.",
""
],
[
"Wagner",
"Carlos E. M.",
""
]
] | We compute the couplings of the zero modes and first excited states of gluons, $W$'s, $Z$ gauge bosons, as well as the Higgs, to the zero modes and first excited states of the third generation quarks, in an RS Gauge-Higgs unification scenario based on a bulk $SO(5)\times U(1)_X$ gauge symmetry, with gauge and fermion fields propagating in the bulk. Using the parameter space consistent with electroweak precision tests and radiative electroweak symmetry breaking, we study numerically the dependence of these couplings on the parameters of our model. Furthermore, after emphasizing the presence of light excited states of the top quark, which couple strongly to the Kaluza Klein gauge bosons, the associated collider phenomenology is analyzed. In particular, we concentrate on the possible detection of the first excited state of the top, $t^1$, which tends to have a higher mass than the ones accessible via regular QCD production processes. We stress that the detection of these particles is still possible due to an increase in the pair production of $t^1$ induced by the first excited state of the gluon, $G^1$. |
hep-ph/9605378 | Tomohiro Matsuda | Tomohiro Matsuda | Alternative Approach to Gaugino Condensation | References and review are slightly changed, 12 pages, latex | Phys.Rev. D54 (1996) 7650-7655 | 10.1103/PhysRevD.54.7650 | UT-746 | hep-ph hep-th | null | We examine the mechanism of gaugino condensation in supersymmetric theories
within a Nambu-Jona-Lasinio type approach. We investigate the effective
Lagrangian description of higher energy theories that include some moduli
fields in the gauge coupling constant. First we consider supersymmetric QCD
with and without a mass term. We can find a phase transition in massless
theory, but when we add a mass term, such a phase transition disappears. We
also examine a model with a dilaton dependent coupling constant and find that
it is very similar to supersymmetric QCD. Application of our method to
supergravity is also examined.
| [
{
"created": "Thu, 23 May 1996 08:04:04 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Aug 1996 06:51:48 GMT",
"version": "v2"
}
] | 2009-10-28 | [
[
"Matsuda",
"Tomohiro",
""
]
] | We examine the mechanism of gaugino condensation in supersymmetric theories within a Nambu-Jona-Lasinio type approach. We investigate the effective Lagrangian description of higher energy theories that include some moduli fields in the gauge coupling constant. First we consider supersymmetric QCD with and without a mass term. We can find a phase transition in massless theory, but when we add a mass term, such a phase transition disappears. We also examine a model with a dilaton dependent coupling constant and find that it is very similar to supersymmetric QCD. Application of our method to supergravity is also examined. |
1501.04964 | Peter Arnold | Peter Arnold and Shahin Iqbal | The LPM effect in sequential bremsstrahlung | 85 pages, 30 figures [only change from v5: fixed trivial typo of a
missing bar in eq. (2.20a). The authors are obsessive.] | null | 10.1007/JHEP04(2015)070 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The splitting processes of bremsstrahlung and pair production in a medium are
coherent over large distances in the very high energy limit, which leads to a
suppression known as the Landau-Pomeranchuk-Migdal (LPM) effect. We analyze the
case when the coherence lengths of two consecutive splitting processes overlap,
which is important for understanding corrections to standard treatments of the
LPM effect in QCD. Previous authors have analyzed this problem in the case of
overlapping double bremsstrahlung where at least one of the bremsstrahlung
gluons is soft. Here we show how to generalize to include the case where both
splittings are hard. A number of techniques must be developed, and so in this
paper we simplify by (i) restricting attention to a subset of the interference
effects, which we call the "crossed" diagrams, and (ii) working in the
large-$N_c$ limit. We first develop some general formulas that could in
principle be implemented numerically (with substantial difficulty). To make
more analytic progress, we then focus on the case of a thick, homogeneous
medium and make the multiple scattering approximation (also known as the $\hat
q$ or harmonic approximation) appropriate at high energy. We show that the
differential rate $d\Gamma/dx\,dy$ for overlapping double bremsstrahlung of
gluons with momentum fractions $x$ and $y$ can then be reduced to the
calculation of a 1-dimensional integral, which we perform numerically. [Though
this paper is unfortunately long, our introduction is enough for getting the
gist of the method.]
| [
{
"created": "Tue, 20 Jan 2015 21:00:10 GMT",
"version": "v1"
},
{
"created": "Fri, 27 Feb 2015 20:05:15 GMT",
"version": "v2"
},
{
"created": "Mon, 13 Apr 2015 22:11:08 GMT",
"version": "v3"
},
{
"created": "Tue, 9 Jun 2015 20:05:07 GMT",
"version": "v4"
},
{
"cr... | 2016-10-20 | [
[
"Arnold",
"Peter",
""
],
[
"Iqbal",
"Shahin",
""
]
] | The splitting processes of bremsstrahlung and pair production in a medium are coherent over large distances in the very high energy limit, which leads to a suppression known as the Landau-Pomeranchuk-Migdal (LPM) effect. We analyze the case when the coherence lengths of two consecutive splitting processes overlap, which is important for understanding corrections to standard treatments of the LPM effect in QCD. Previous authors have analyzed this problem in the case of overlapping double bremsstrahlung where at least one of the bremsstrahlung gluons is soft. Here we show how to generalize to include the case where both splittings are hard. A number of techniques must be developed, and so in this paper we simplify by (i) restricting attention to a subset of the interference effects, which we call the "crossed" diagrams, and (ii) working in the large-$N_c$ limit. We first develop some general formulas that could in principle be implemented numerically (with substantial difficulty). To make more analytic progress, we then focus on the case of a thick, homogeneous medium and make the multiple scattering approximation (also known as the $\hat q$ or harmonic approximation) appropriate at high energy. We show that the differential rate $d\Gamma/dx\,dy$ for overlapping double bremsstrahlung of gluons with momentum fractions $x$ and $y$ can then be reduced to the calculation of a 1-dimensional integral, which we perform numerically. [Though this paper is unfortunately long, our introduction is enough for getting the gist of the method.] |
2402.16344 | Xin-Shuai Yan | Xin-Shuai Yan, Liang-Hui Zhang, Qin Chang, and Ya-Dong Yang | Probing new physics with polarization components of the tau lepton in
quasielastic $e^- p \to \Lambda_c \tau^-$ scattering process | 20 pages, 4 figures, 5 tables | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Kinematics restrict the ability of rare charm decays to explore the charged
Lepton Flavor Violation processes mediated by the quark-level $c\to u \ell
\tau$ transition. To fill the gap, we propose exploring new physics (NP)
through the quasielastic scattering process $e^-p\to \tau^-\Lambda_c$ and the
polarization of the $\tau$ lepton. As analyzing modes for the $\tau$
polarization, we consider the decays $\tau^-\to \pi^-\nu_{\tau}$, $\tau^-\to
\rho^-\nu_{\tau}$, and $\tau^- \to \ell^-\bar{\nu}_{\ell}\nu_{\tau}$, and show
that the $\tau$ polarization components can be extracted from analyzing the
kinematics of the $\tau$ visible decay products. In the framework of a general
low-energy effective Lagrangian, we then perform a detailed analysis of the
polarization components in various aspects and scrutinize possible NP signals.
With one upcoming experimental setup, we finally demonstrate promising event
rate can be expected for the cascade process and, even in the worst-case
scenario -- no signals is observed at all -- it can still provide a competitive
potential for constraining the NP, compared with those from the high-$p_T$
dilepton invariant mass tails at high-energy colliders.
| [
{
"created": "Mon, 26 Feb 2024 06:58:47 GMT",
"version": "v1"
},
{
"created": "Sun, 7 Apr 2024 00:48:05 GMT",
"version": "v2"
}
] | 2024-04-09 | [
[
"Yan",
"Xin-Shuai",
""
],
[
"Zhang",
"Liang-Hui",
""
],
[
"Chang",
"Qin",
""
],
[
"Yang",
"Ya-Dong",
""
]
] | Kinematics restrict the ability of rare charm decays to explore the charged Lepton Flavor Violation processes mediated by the quark-level $c\to u \ell \tau$ transition. To fill the gap, we propose exploring new physics (NP) through the quasielastic scattering process $e^-p\to \tau^-\Lambda_c$ and the polarization of the $\tau$ lepton. As analyzing modes for the $\tau$ polarization, we consider the decays $\tau^-\to \pi^-\nu_{\tau}$, $\tau^-\to \rho^-\nu_{\tau}$, and $\tau^- \to \ell^-\bar{\nu}_{\ell}\nu_{\tau}$, and show that the $\tau$ polarization components can be extracted from analyzing the kinematics of the $\tau$ visible decay products. In the framework of a general low-energy effective Lagrangian, we then perform a detailed analysis of the polarization components in various aspects and scrutinize possible NP signals. With one upcoming experimental setup, we finally demonstrate promising event rate can be expected for the cascade process and, even in the worst-case scenario -- no signals is observed at all -- it can still provide a competitive potential for constraining the NP, compared with those from the high-$p_T$ dilepton invariant mass tails at high-energy colliders. |
1106.5499 | Andreas Crivellin | Andreas Crivellin and Lorenzo Mercolli | B -> X_d gamma and constraints on new physics | 5 pages, 3 figures, experimental value for b->d+gamma corrected,
version accepted for publication in PRD | null | 10.1103/PhysRevD.84.114005 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We combine recent progress in measuring the branching ratio of the decay
B->X_d gamma$ with the discovery that hadronic uncertainties in the CP-averaged
branching ratio drop out to a large extent. Implications of these improvements
on the size of possible new physics effects are investigated. We find the
updated SM prediction for the CP-averaged branching ratio to be Br[B->X_d
gamma]^SM_E_gamma>1.6 GeV = 1.54^+0.26-0.31*10^-5, which should be compared
with the experimental value of Br[B->X_d gamma]^exp_E_gamma>1.6GeV =
(1.41+-0.57) 10^-5. After performing a model independent analysis, we consider
different new physics models: the MSSM with generic sources of flavor
violation, the two Higgs doublet model of type III and a model with
right-handed charged currents. It is found that the constraints on the SUSY
parameters delta^d_13 have improved and that the absolute value of the
right-handed quark mixing matrix element |V^R_td| must be smaller than
1.5*10^-4.
| [
{
"created": "Mon, 27 Jun 2011 20:00:03 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Jun 2011 10:43:56 GMT",
"version": "v2"
},
{
"created": "Fri, 12 Aug 2011 00:30:38 GMT",
"version": "v3"
},
{
"created": "Thu, 10 Nov 2011 17:44:48 GMT",
"version": "v4"
}
] | 2015-03-19 | [
[
"Crivellin",
"Andreas",
""
],
[
"Mercolli",
"Lorenzo",
""
]
] | We combine recent progress in measuring the branching ratio of the decay B->X_d gamma$ with the discovery that hadronic uncertainties in the CP-averaged branching ratio drop out to a large extent. Implications of these improvements on the size of possible new physics effects are investigated. We find the updated SM prediction for the CP-averaged branching ratio to be Br[B->X_d gamma]^SM_E_gamma>1.6 GeV = 1.54^+0.26-0.31*10^-5, which should be compared with the experimental value of Br[B->X_d gamma]^exp_E_gamma>1.6GeV = (1.41+-0.57) 10^-5. After performing a model independent analysis, we consider different new physics models: the MSSM with generic sources of flavor violation, the two Higgs doublet model of type III and a model with right-handed charged currents. It is found that the constraints on the SUSY parameters delta^d_13 have improved and that the absolute value of the right-handed quark mixing matrix element |V^R_td| must be smaller than 1.5*10^-4. |
0912.4221 | Masahiro Ibe | Masahiro Ibe, Tsutomu T. Yanagida | Neutralino Dark Matter in Gauge Mediation in Light of CDMS-II | 4 pages; an appendix added; several references added | Phys.Rev.D81:035017,2010 | 10.1103/PhysRevD.81.035017 | IPMU09-0161 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A recent observation of the two candidate events of the dark matter recoiling
at CDMS-II is suggestive of dark matter with a mass not far above 100GeV. We
propose a model of gauge mediated supersymmetry breaking where the lightest
neutralino is identified as dark matter which may provide the observed signals.
| [
{
"created": "Mon, 21 Dec 2009 17:52:43 GMT",
"version": "v1"
},
{
"created": "Thu, 24 Dec 2009 19:38:37 GMT",
"version": "v2"
}
] | 2010-04-06 | [
[
"Ibe",
"Masahiro",
""
],
[
"Yanagida",
"Tsutomu T.",
""
]
] | A recent observation of the two candidate events of the dark matter recoiling at CDMS-II is suggestive of dark matter with a mass not far above 100GeV. We propose a model of gauge mediated supersymmetry breaking where the lightest neutralino is identified as dark matter which may provide the observed signals. |
1107.4683 | Fred Jegerlehner | Fred Jegerlehner | Electroweak effective couplings for future precision experiments | 10 pages, 3 figures | null | 10.1393/ncc/i2011-11011-0 | HU-EP-11/33, DESY 11-117 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The leading hadronic effects in electroweak theory derive from vacuum
polarization which are non-perturbative hadronic contributions to the running
of the gauge couplings, the electromagnetic alpha_{em}(s) and the SU(2)_L
coupling alpha_2(s). I will report on my recent package "alphaQED", which
besides the effective fine structure constant alpha_{em}(s) also allows for a
fairly precise calculation of the SU(2)_L gauge coupling alpha_2(s). I will
briefly review the role, future requirements and possibilities. Applied
together with the "Rhad" package by Harlander and Steinhauser, the package
allows to calculate all SM running couplings as well as running sin^2 Theta
versions with state-of-the-art accuracy.
| [
{
"created": "Sat, 23 Jul 2011 11:35:06 GMT",
"version": "v1"
}
] | 2022-03-02 | [
[
"Jegerlehner",
"Fred",
""
]
] | The leading hadronic effects in electroweak theory derive from vacuum polarization which are non-perturbative hadronic contributions to the running of the gauge couplings, the electromagnetic alpha_{em}(s) and the SU(2)_L coupling alpha_2(s). I will report on my recent package "alphaQED", which besides the effective fine structure constant alpha_{em}(s) also allows for a fairly precise calculation of the SU(2)_L gauge coupling alpha_2(s). I will briefly review the role, future requirements and possibilities. Applied together with the "Rhad" package by Harlander and Steinhauser, the package allows to calculate all SM running couplings as well as running sin^2 Theta versions with state-of-the-art accuracy. |
hep-ph/0702063 | Hiroto Nakajima | H. Nakajima and Y. Shinbara | Solutions to large B and L breaking in the Randall-Sundrum model | 12 pages, No figures, Added references | Phys.Lett.B648:294-300,2007 | 10.1016/j.physletb.2007.03.033 | UT-07-06 | hep-ph | null | The stability of proton and neutrino masses are discussed in the
Randall-Sundrum model. We show that relevant operators should be suppressed, if
the hierarchical Yukawa matrices are explained only by configurations of
wavefunctions for fermions and the Higgs field along the extra dimension. We
assume a $Z_N$ discrete gauge symmetry to suppress those operators. In the
Dirac neutrino case, there is an infinite number of symmetries which may forbid
the dangerous operators. In the Majorana neutrino case, the discrete gauge
symmetries should originate from $U(1)_X$ gauge symmetries which are broken on
the Planck brane. We also comment on the $n-\bar{n}$ oscillation as a
phenomenon which can distinguish those discrete gauge symmetries.
| [
{
"created": "Tue, 6 Feb 2007 08:53:37 GMT",
"version": "v1"
},
{
"created": "Fri, 25 May 2007 07:06:04 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Nakajima",
"H.",
""
],
[
"Shinbara",
"Y.",
""
]
] | The stability of proton and neutrino masses are discussed in the Randall-Sundrum model. We show that relevant operators should be suppressed, if the hierarchical Yukawa matrices are explained only by configurations of wavefunctions for fermions and the Higgs field along the extra dimension. We assume a $Z_N$ discrete gauge symmetry to suppress those operators. In the Dirac neutrino case, there is an infinite number of symmetries which may forbid the dangerous operators. In the Majorana neutrino case, the discrete gauge symmetries should originate from $U(1)_X$ gauge symmetries which are broken on the Planck brane. We also comment on the $n-\bar{n}$ oscillation as a phenomenon which can distinguish those discrete gauge symmetries. |
hep-ph/0103189 | Qsyan | Qi-Shu Yan | Radiative electroweak symmetry breaking in the extra dimensions
scenarios | References added and the figure redrawn | null | null | null | hep-ph | null | We study the radiative spontaneous electroweak symmetry breaking in the extra
dimensions scenarios of the standard model extension proposed by Antoniadis
{\it et al}, Dienes {\it et al.} and Pomarol {\it et al.}. In the framework of
multi-scale effective theory when viewing from the ultraviolet cutoff scale
down to the low energy scale, we find that the effects of Kaluza-Klein
excitations of bosons can change the sign of the Higgs mass term of the
standard model from positive to negative and therefore trigger the electroweak
symmetry breaking at 1.6 (2) TeV or so when the compactification scale is
assumed to be 0.8 (1.5) TeV or so. New particle contents beyond the SM or
supersymmetry are not necessary for this mechanism. We conclude that in the
extra dimension scenarios, the radiative correction can naturally induce the
desired electroweak symmetry breaking.
| [
{
"created": "Sun, 18 Mar 2001 04:41:51 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Mar 2001 02:24:13 GMT",
"version": "v2"
},
{
"created": "Thu, 22 Mar 2001 12:57:29 GMT",
"version": "v3"
}
] | 2016-09-06 | [
[
"Yan",
"Qi-Shu",
""
]
] | We study the radiative spontaneous electroweak symmetry breaking in the extra dimensions scenarios of the standard model extension proposed by Antoniadis {\it et al}, Dienes {\it et al.} and Pomarol {\it et al.}. In the framework of multi-scale effective theory when viewing from the ultraviolet cutoff scale down to the low energy scale, we find that the effects of Kaluza-Klein excitations of bosons can change the sign of the Higgs mass term of the standard model from positive to negative and therefore trigger the electroweak symmetry breaking at 1.6 (2) TeV or so when the compactification scale is assumed to be 0.8 (1.5) TeV or so. New particle contents beyond the SM or supersymmetry are not necessary for this mechanism. We conclude that in the extra dimension scenarios, the radiative correction can naturally induce the desired electroweak symmetry breaking. |
hep-ph/0405224 | Hirotaka Sugawara | Hirotaka Sugawara | M-Theory Phenomenology and See-Saw Mechanisms | 19 pages, 16 figures, Talk given at Neutrino Mass and See-Saw
Mechanism, Fujihara Seminar | null | 10.1016/j.nuclphysbps.2004.10.074 | KEK-TH-958 | hep-ph | null | A version of M-theory phenomenology is proposed in which the symmetry is
based on the group $SO(10) \times SO(10) \times SO(10) \times U(1) \times
U(1)$. Each SO(10) group acts on a single generation. The $U(1) \times U(1)$ is
regarded as the hidden sector symmetry group. The supersymmetry is broken in
the hidden sector by the Fayet-Iliopoulos $D$-term for each group. The $D$-term
is needed also to circumvent the powerful non-renormalization theorem since the
$SO(10) \times SO(10) \times SO(10)$ is broken down to the usual SO(10) by the
pair condensation of certain messenger sector multiplets. The exchange of U(1)
gauge bosons gives an attractive force for the pair to be created and
condensed. The off-diagonal mass matrix elements among the generations in these
messenger sector multiplets are the source of the flavor dynamics including the
CP violation. The pair condensation of another multiplet in the messenger
sector leads to the doublet-triplet splitting. The SO(10) decuplet Higgs
couples only to one of the generations. The other couplings should, therefore,
be calculated as higher order corrections. We present our preliminary results
on the calculation of the mass matrices and the mixing angles for leptons and
quarks in this model.
| [
{
"created": "Sun, 23 May 2004 19:39:32 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Sugawara",
"Hirotaka",
""
]
] | A version of M-theory phenomenology is proposed in which the symmetry is based on the group $SO(10) \times SO(10) \times SO(10) \times U(1) \times U(1)$. Each SO(10) group acts on a single generation. The $U(1) \times U(1)$ is regarded as the hidden sector symmetry group. The supersymmetry is broken in the hidden sector by the Fayet-Iliopoulos $D$-term for each group. The $D$-term is needed also to circumvent the powerful non-renormalization theorem since the $SO(10) \times SO(10) \times SO(10)$ is broken down to the usual SO(10) by the pair condensation of certain messenger sector multiplets. The exchange of U(1) gauge bosons gives an attractive force for the pair to be created and condensed. The off-diagonal mass matrix elements among the generations in these messenger sector multiplets are the source of the flavor dynamics including the CP violation. The pair condensation of another multiplet in the messenger sector leads to the doublet-triplet splitting. The SO(10) decuplet Higgs couples only to one of the generations. The other couplings should, therefore, be calculated as higher order corrections. We present our preliminary results on the calculation of the mass matrices and the mixing angles for leptons and quarks in this model. |
hep-ph/9705340 | Will Loinaz | D. Boyanovsky, Will Loinaz, R.S. Willey (U. of Pittsburgh) | Gauge Invariant Higgs mass bounds from the Physical Effective Potential | 23 pages, 2 figures, REVTEX | Phys.Rev. D57 (1998) 100-111 | 10.1103/PhysRevD.57.100 | null | hep-ph | null | We study a simplified version of the Standard Electroweak Model and introduce
the concept of the physical gauge invariant effective potential in terms of
matrix elements of the Hamiltonian in physical states. This procedure allows an
unambiguous identification of the symmetry breaking order parameter and the
resulting effective potential as the energy in a constrained state. We
explicitly compute the physical effective potential at one loop order and
improve it using the RG. This construction allows us to extract a reliable,
gauge invariant bound on the Higgs mass by unambiguously obtaining the scale at
which new physics should emerge to preclude vacuum instability. Comparison is
made with popular gauge fixing procedures and an ``error'' estimate is provided
between the Landau gauge fixed and the gauge invariant results.
| [
{
"created": "Fri, 16 May 1997 16:02:37 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Boyanovsky",
"D.",
"",
"U. of Pittsburgh"
],
[
"Loinaz",
"Will",
"",
"U. of Pittsburgh"
],
[
"Willey",
"R. S.",
"",
"U. of Pittsburgh"
]
] | We study a simplified version of the Standard Electroweak Model and introduce the concept of the physical gauge invariant effective potential in terms of matrix elements of the Hamiltonian in physical states. This procedure allows an unambiguous identification of the symmetry breaking order parameter and the resulting effective potential as the energy in a constrained state. We explicitly compute the physical effective potential at one loop order and improve it using the RG. This construction allows us to extract a reliable, gauge invariant bound on the Higgs mass by unambiguously obtaining the scale at which new physics should emerge to preclude vacuum instability. Comparison is made with popular gauge fixing procedures and an ``error'' estimate is provided between the Landau gauge fixed and the gauge invariant results. |
hep-ph/9504223 | Dirk Graudenz | DIRK GRAUDENZ (CERN) | THE PHYSICS OF THE STANDARD MODEL HIGGS BOSON AT THE LHC | 6 pages (LaTeX); figures are included via epsfig; the corresponding
postscript files are uuencoded | null | null | CERN-TH/95-77 | hep-ph | null | Some topics related to Standard Model Higgs boson physics at the Large Hadron
Collider are reviewed. Emphasis is put on an overview of QCD corrections to
Higgs boson decay and production processes. (Invited talk presented at the
XXXth Rencontres de Moriond, Les Arcs 1800, March 19-26, 1995; to appear in the
proceedings of the conference.)
| [
{
"created": "Wed, 5 Apr 1995 07:38:43 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"GRAUDENZ",
"DIRK",
"",
"CERN"
]
] | Some topics related to Standard Model Higgs boson physics at the Large Hadron Collider are reviewed. Emphasis is put on an overview of QCD corrections to Higgs boson decay and production processes. (Invited talk presented at the XXXth Rencontres de Moriond, Les Arcs 1800, March 19-26, 1995; to appear in the proceedings of the conference.) |
2308.05210 | Emre Gurkanli | A. Guti\'errez-Rodr\'iguez, E. Gurkanli, M. K\"oksal, V. Ari, M. A.
Hern\'andez-Ru\'iz | Expected sensitivity on the anomalous quartic neutral gauge couplings in
$\gamma\gamma$ collisions at the CLIC | 21 pages, 6 figures | null | 10.1140/epjp/s13360-023-04779-4 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | The presence of multi-boson self-interactions is implied by the non-Abelian
gauge structure of the Standard Model (SM). Precise measurements of these
interactions allow not only testing the nature of the SM but also new physics
contribution arising from the beyond SM. The investigation of these
interactions can be approached in a model-independent manner using an effective
theory approach, which forms the main motivation of this study. In this paper,
we examine the anomalous neutral quartic gauge couplings through the process
$\gamma \gamma \rightarrow Z Z$ at the Compact Linear Collider (CLIC) with the
center-of-mass energy of $\sqrt{s}=3$ TeV, integrated luminosities of ${\cal
L}=5$ $\rm ab^{-1}$. The anomalous neutral quartic gauge couplings is
implemented into FeynRules to generate a UFO module inserted into Madgraph to
generate both background and signal events. These events are then passed
through Pythia 8 for parton showering and Delphes to include realistic detector
effects. We obtain that the sensitivities on the anomalous quartic neutral
gauge couplings with $95\%$ Confidence Level are given as:
$f_{T0}/\Lambda^{4}=[-1.06; 1.08]\times 10^{-3}$ ${\rm TeV^{-4}}$,
$f_{T1}/\Lambda^{4}=[-1.06; 1.08]\times 10^{-3}$ ${\rm
TeV^{-4}}$,$f_{T2}/\Lambda^{4}=[-1.06; 1.08]\times 10^{-3}$ ${\rm
TeV^{-4}}$,$f_{T0}/\Lambda^{4}=[-1.06; 1.08]\times 10^{-3}$ ${\rm TeV^{-4}}$,
$f_{T5}/\Lambda^{4}=[-4.08; 4.08]\times 10^{-4}$ ${\rm TeV^{-4}}$ and
$f_{T8}/\Lambda^{4}=[-1.10; 1.10]\times10^{-4}$ ${\rm TeV^{-4}}$. Our results
on the anomalous quartic neutral gauge couplings are set more stringent
sensitivity with respect to the recent experimental limits.
| [
{
"created": "Wed, 9 Aug 2023 20:22:59 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Dec 2023 11:28:08 GMT",
"version": "v2"
}
] | 2023-12-20 | [
[
"Gutiérrez-Rodríguez",
"A.",
""
],
[
"Gurkanli",
"E.",
""
],
[
"Köksal",
"M.",
""
],
[
"Ari",
"V.",
""
],
[
"Hernández-Ruíz",
"M. A.",
""
]
] | The presence of multi-boson self-interactions is implied by the non-Abelian gauge structure of the Standard Model (SM). Precise measurements of these interactions allow not only testing the nature of the SM but also new physics contribution arising from the beyond SM. The investigation of these interactions can be approached in a model-independent manner using an effective theory approach, which forms the main motivation of this study. In this paper, we examine the anomalous neutral quartic gauge couplings through the process $\gamma \gamma \rightarrow Z Z$ at the Compact Linear Collider (CLIC) with the center-of-mass energy of $\sqrt{s}=3$ TeV, integrated luminosities of ${\cal L}=5$ $\rm ab^{-1}$. The anomalous neutral quartic gauge couplings is implemented into FeynRules to generate a UFO module inserted into Madgraph to generate both background and signal events. These events are then passed through Pythia 8 for parton showering and Delphes to include realistic detector effects. We obtain that the sensitivities on the anomalous quartic neutral gauge couplings with $95\%$ Confidence Level are given as: $f_{T0}/\Lambda^{4}=[-1.06; 1.08]\times 10^{-3}$ ${\rm TeV^{-4}}$, $f_{T1}/\Lambda^{4}=[-1.06; 1.08]\times 10^{-3}$ ${\rm TeV^{-4}}$,$f_{T2}/\Lambda^{4}=[-1.06; 1.08]\times 10^{-3}$ ${\rm TeV^{-4}}$,$f_{T0}/\Lambda^{4}=[-1.06; 1.08]\times 10^{-3}$ ${\rm TeV^{-4}}$, $f_{T5}/\Lambda^{4}=[-4.08; 4.08]\times 10^{-4}$ ${\rm TeV^{-4}}$ and $f_{T8}/\Lambda^{4}=[-1.10; 1.10]\times10^{-4}$ ${\rm TeV^{-4}}$. Our results on the anomalous quartic neutral gauge couplings are set more stringent sensitivity with respect to the recent experimental limits. |
2106.15228 | Keisho Hidaka | H. Eberl (1), K. Hidaka (2), E. Ginina (1, 3) and A. Ishikawa (4, 5,6)
((1) HEPHY, Vienna, (2) Tokyo Gakugei U., (3) VRV, Vienna, (4) KEK, Tsukuba,
(5) SOKENDAI, Hayama, (6) ICEPP, Tokyo) | Imprint of SUSY in radiative B-meson decays | 34 pages, 13 figures, a few comments added, final result unchanged | Phys. Rev. D104 (2021) 075025 | 10.1103/PhysRevD.104.075025 | HEPHY-PUB 1024/21, KEK Preprint 2021-7 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study supersymmetric (SUSY) effects on $C_7(\mu_b)$ and $C'_7(\mu_b)$
which are the Wilson coefficients (WCs) for $b \to s \gamma$ at b-quark mass
scale $\mu_b$ and are closely related to radiative $B$-meson decays. The
SUSY-loop contributions to $C_7(\mu_b)$ and $C'_7(\mu_b)$ are calculated at
leading order (LO) in the Minimal Supersymmetric Standard Model (MSSM) with
general quark-flavour violation (QFV). For the first time we perform a
systematic MSSM parameter scan for the WCs $C_7(\mu_b)$ and $C'_7(\mu_b)$
respecting all the relevant constraints, i.e. the theoretical constraints from
vacuum stability conditions and the experimental constraints, such as those
from $K$- and $B$-meson data and electroweak precision data, as well as recent
limits on SUSY particle masses and the 125 GeV Higgs boson data from LHC
experiments. From the parameter scan we find the following: (1) The MSSM
contribution to Re($C_7(\mu_b)$) can be as large as $\sim \pm 0.05$, which
could correspond to about 3$\sigma$ significance of New Physics (NP) signal in
the future LHCb and Belle II experiments. (2) The MSSM contribution to
Re($C'_7(\mu_b)$) can be as large as $\sim -0.08$, which could correspond to
about 4$\sigma$ significance of NP signal in the future LHCb and Belle II
experiments. (3) These large MSSM contributions to the WCs are mainly due to
(i) large scharm-stop mixing and large scharm/stop involved trilinear
couplings, (ii) large sstrange-sbottom mixing and large sstrange-sbottom
involved trilinear couplings and (iii) large bottom Yukawa coupling $Y_b$ for
large $\tan\beta$ and large top Yukawa coupling $Y_t$. In case such large NP
contributions to the WCs are really observed in the future experiments at Belle
II and LHCb Upgrade, this could be the imprint of QFV SUSY (the MSSM with
general QFV).
| [
{
"created": "Tue, 29 Jun 2021 10:25:59 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Nov 2021 15:32:24 GMT",
"version": "v2"
}
] | 2021-11-05 | [
[
"Eberl",
"H.",
""
],
[
"Hidaka",
"K.",
""
],
[
"Ginina",
"E.",
""
],
[
"Ishikawa",
"A.",
""
]
] | We study supersymmetric (SUSY) effects on $C_7(\mu_b)$ and $C'_7(\mu_b)$ which are the Wilson coefficients (WCs) for $b \to s \gamma$ at b-quark mass scale $\mu_b$ and are closely related to radiative $B$-meson decays. The SUSY-loop contributions to $C_7(\mu_b)$ and $C'_7(\mu_b)$ are calculated at leading order (LO) in the Minimal Supersymmetric Standard Model (MSSM) with general quark-flavour violation (QFV). For the first time we perform a systematic MSSM parameter scan for the WCs $C_7(\mu_b)$ and $C'_7(\mu_b)$ respecting all the relevant constraints, i.e. the theoretical constraints from vacuum stability conditions and the experimental constraints, such as those from $K$- and $B$-meson data and electroweak precision data, as well as recent limits on SUSY particle masses and the 125 GeV Higgs boson data from LHC experiments. From the parameter scan we find the following: (1) The MSSM contribution to Re($C_7(\mu_b)$) can be as large as $\sim \pm 0.05$, which could correspond to about 3$\sigma$ significance of New Physics (NP) signal in the future LHCb and Belle II experiments. (2) The MSSM contribution to Re($C'_7(\mu_b)$) can be as large as $\sim -0.08$, which could correspond to about 4$\sigma$ significance of NP signal in the future LHCb and Belle II experiments. (3) These large MSSM contributions to the WCs are mainly due to (i) large scharm-stop mixing and large scharm/stop involved trilinear couplings, (ii) large sstrange-sbottom mixing and large sstrange-sbottom involved trilinear couplings and (iii) large bottom Yukawa coupling $Y_b$ for large $\tan\beta$ and large top Yukawa coupling $Y_t$. In case such large NP contributions to the WCs are really observed in the future experiments at Belle II and LHCb Upgrade, this could be the imprint of QFV SUSY (the MSSM with general QFV). |
hep-ph/9409205 | Ed Stoeffhaas | D. Zeppenfeld | Gluon Radiation Patterns in Pomeron Exchange Events | Talk given at the XXVII International Conference on High Energy
Physics, Glasgow, Scotland, July 21--27, 1994. Latex file, uses ichep.sty,
appended after "\end{document}". Three uufiled postscript figures included.
Hardcopies available upon request. MAD/PH/846 | null | null | null | hep-ph | null | Color singlet two gluon exchange provides a perturbative model for the
pomeron. This mechanism is thought to explain the production of rapidity gaps
in hard dijet events at the Tevatron. It is shown that in $qQ$ scattering via
two gluon color singlet exchange the emission of soft gluons follows closely
the pattern found for $t$-channel photon exchange. Gluon emission is strongly
suppressed between the two quark jets. After hadronization this leads to a
depressed level of hadronic activity between the jets and thus allows the
formation of rapidity gaps.
| [
{
"created": "Thu, 1 Sep 1994 16:26:30 GMT",
"version": "v1"
}
] | 2009-09-25 | [
[
"Zeppenfeld",
"D.",
""
]
] | Color singlet two gluon exchange provides a perturbative model for the pomeron. This mechanism is thought to explain the production of rapidity gaps in hard dijet events at the Tevatron. It is shown that in $qQ$ scattering via two gluon color singlet exchange the emission of soft gluons follows closely the pattern found for $t$-channel photon exchange. Gluon emission is strongly suppressed between the two quark jets. After hadronization this leads to a depressed level of hadronic activity between the jets and thus allows the formation of rapidity gaps. |
2309.00547 | Andre Hoang | Bahman Dehnadi, Andr\'e H. Hoang, Oliver L. Jin, and Vicent Mateu | Top Quark Mass Calibration for Monte Carlo Event Generators -- An Update | 70 pages, 15 figures; minor improvements, results unchanged, version
published in JHEP | null | null | UWThPh-2023-16, DESY-23-127 | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | We generalize and update our former top quark mass calibration framework for
Monte Carlo (MC) event generators based on the $e^+e^-$ hadron-level
2-jettiness $\tau_2$ distribution in the resonance region for boosted $t\bar t$
production, that was used to relate the PYTHIA 8.205 top mass parameter
$m_t^{\rm MC}$ to the MSR mass $m_t^{\rm MSR}(R)$ and the pole mass $m_t^{\rm
pole}$. The current most precise direct top mass measurements specifically
determine $m_t^{\rm MC}$. The updated framework includes the addition of the
shape variables sum of jet masses $\tau_s$ and modified jet mass $\tau_m$, and
the treatment of two more gap subtraction schemes to remove the ${\cal
O}(\Lambda_{\rm QCD})$ renormalon related to large-angle soft radiation. These
generalizations entail implementing a more versatile shape-function fit
procedure and accounting for a certain type of $(m_t/Q)^2$ power corrections to
achieve gap-scheme and observable independent results. The theoretical
description employs boosted heavy-quark effective theory (bHQET) at
next-to-next-to-logarithmic order (N$^2$LL), matched to soft-collinear
effective theory (SCET) at N$^2$LL and full QCD at next-to-leading order (NLO),
and includes the dominant top width effects. Furthermore, the software
framework has been modernized to use standard file and event record formats. We
update the top mass calibration results by applying the new framework to PYTHIA
8.205, HERWIG 7.2 and SHERPA 2.2.11. Even though the hadron-level resonance
positions produced by the three generators differ significantly for the same
top mass parameter $m_t^{\rm MC}$ value, the calibration shows that these
differences arise from the hadronization modeling. Indeed, we find that
$m_t^{\rm MC}$ agrees with $m_t^{\rm MSR}(1\,\mbox{GeV})$ within $200$ MeV for
the three generators and differs from the pole mass by $350$ to $600$ MeV.
| [
{
"created": "Fri, 1 Sep 2023 15:56:09 GMT",
"version": "v1"
},
{
"created": "Sat, 9 Dec 2023 18:32:48 GMT",
"version": "v2"
}
] | 2023-12-12 | [
[
"Dehnadi",
"Bahman",
""
],
[
"Hoang",
"André H.",
""
],
[
"Jin",
"Oliver L.",
""
],
[
"Mateu",
"Vicent",
""
]
] | We generalize and update our former top quark mass calibration framework for Monte Carlo (MC) event generators based on the $e^+e^-$ hadron-level 2-jettiness $\tau_2$ distribution in the resonance region for boosted $t\bar t$ production, that was used to relate the PYTHIA 8.205 top mass parameter $m_t^{\rm MC}$ to the MSR mass $m_t^{\rm MSR}(R)$ and the pole mass $m_t^{\rm pole}$. The current most precise direct top mass measurements specifically determine $m_t^{\rm MC}$. The updated framework includes the addition of the shape variables sum of jet masses $\tau_s$ and modified jet mass $\tau_m$, and the treatment of two more gap subtraction schemes to remove the ${\cal O}(\Lambda_{\rm QCD})$ renormalon related to large-angle soft radiation. These generalizations entail implementing a more versatile shape-function fit procedure and accounting for a certain type of $(m_t/Q)^2$ power corrections to achieve gap-scheme and observable independent results. The theoretical description employs boosted heavy-quark effective theory (bHQET) at next-to-next-to-logarithmic order (N$^2$LL), matched to soft-collinear effective theory (SCET) at N$^2$LL and full QCD at next-to-leading order (NLO), and includes the dominant top width effects. Furthermore, the software framework has been modernized to use standard file and event record formats. We update the top mass calibration results by applying the new framework to PYTHIA 8.205, HERWIG 7.2 and SHERPA 2.2.11. Even though the hadron-level resonance positions produced by the three generators differ significantly for the same top mass parameter $m_t^{\rm MC}$ value, the calibration shows that these differences arise from the hadronization modeling. Indeed, we find that $m_t^{\rm MC}$ agrees with $m_t^{\rm MSR}(1\,\mbox{GeV})$ within $200$ MeV for the three generators and differs from the pole mass by $350$ to $600$ MeV. |
1110.4491 | Yue-Liang Wu | Da Huang, Yue-Liang Wu | Chiral Thermodynamic Model of QCD and its Critical Behavior in the
Closed-Time-Path Green Function Approach | 29 pages, 5 figures, references and appendix added | null | null | null | hep-ph hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | By applying the closed-time-path Green function formalism to the chiral
dynamical model based on an effective Lagrangian of chiral quarks with the
nonlinear-realized meson fields as bosonized auxiliary fields, we then arrive
at a chiral thermodynamic model for the meson fields with finite temperature.
Particular attention is paid to the spontaneous chiral symmetry breaking and
restoration from the dynamically generated effective composite Higgs potential
of meson fields at finite temperature. It is shown that the minimal condition
of the effective composite Higgs potential of meson fields leads to the
thermodynamic gap equation at finite temperature, which enables us to
investigate the critical behavior of the effective chiral thermodynamical model
and to explore the QCD phase transition. After fixing the free parameters in
the effective chiral Lagrangian at low energies with zero temperature, we
determine the critical temperature of the chiral symmetry restoration and
present a consistent prediction for the thermodynamical behavior of several
physically interesting quantities, which include the vacuum expectation value
$v_o(T)$, quark condensate $<\bar{q}q>(T)$, pion decay constant $f_\pi(T)$ and
pion meson mass $m_{\pi}(T)$. In particular, it is also shown that the
thermodynamic scaling behavior of these quantities becomes the same near the
critical point of phase transition.
| [
{
"created": "Thu, 20 Oct 2011 11:01:24 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Feb 2012 00:44:44 GMT",
"version": "v2"
}
] | 2012-03-02 | [
[
"Huang",
"Da",
""
],
[
"Wu",
"Yue-Liang",
""
]
] | By applying the closed-time-path Green function formalism to the chiral dynamical model based on an effective Lagrangian of chiral quarks with the nonlinear-realized meson fields as bosonized auxiliary fields, we then arrive at a chiral thermodynamic model for the meson fields with finite temperature. Particular attention is paid to the spontaneous chiral symmetry breaking and restoration from the dynamically generated effective composite Higgs potential of meson fields at finite temperature. It is shown that the minimal condition of the effective composite Higgs potential of meson fields leads to the thermodynamic gap equation at finite temperature, which enables us to investigate the critical behavior of the effective chiral thermodynamical model and to explore the QCD phase transition. After fixing the free parameters in the effective chiral Lagrangian at low energies with zero temperature, we determine the critical temperature of the chiral symmetry restoration and present a consistent prediction for the thermodynamical behavior of several physically interesting quantities, which include the vacuum expectation value $v_o(T)$, quark condensate $<\bar{q}q>(T)$, pion decay constant $f_\pi(T)$ and pion meson mass $m_{\pi}(T)$. In particular, it is also shown that the thermodynamic scaling behavior of these quantities becomes the same near the critical point of phase transition. |
2008.12598 | Jongkuk Kim | Yongsoo Jho, Jongkuk Kim, Pyungwon Ko, Seong Chan Park | Search for sterile neutrino with light gauge interactions: recasting
collider, beam-dump, and neutrino telescope searches | 9 pages, 4 figures, and 3 tables | null | null | KIAS-P20046, LDU-2020-07 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate features of the sterile neutrinos in the presence of a light
gauge boson $X^\mu$ that couples to the neutrino sector. The novel bounds on
the active-sterile neutrino mixings $| U_{\ell 4} |^2$, especially for tau
flavor ($l = \tau$), from various collider and fixed target experiments are
explored. Also, taking into account the additional decay channel of the sterile
neutrino into a light gauge boson ($\nu_4 \to \nu_\ell e^+ e^-$), we explore
and constrain a parameter space for low energy excess in neutrino oscillation
experiments.
| [
{
"created": "Fri, 28 Aug 2020 12:00:12 GMT",
"version": "v1"
}
] | 2020-08-31 | [
[
"Jho",
"Yongsoo",
""
],
[
"Kim",
"Jongkuk",
""
],
[
"Ko",
"Pyungwon",
""
],
[
"Park",
"Seong Chan",
""
]
] | We investigate features of the sterile neutrinos in the presence of a light gauge boson $X^\mu$ that couples to the neutrino sector. The novel bounds on the active-sterile neutrino mixings $| U_{\ell 4} |^2$, especially for tau flavor ($l = \tau$), from various collider and fixed target experiments are explored. Also, taking into account the additional decay channel of the sterile neutrino into a light gauge boson ($\nu_4 \to \nu_\ell e^+ e^-$), we explore and constrain a parameter space for low energy excess in neutrino oscillation experiments. |
hep-ph/0312162 | Bo-Qiang Ma | Bo-Wen Xiao, Bo-Qiang Ma | Pion-photon and photon-pion transition form factors in light-cone
formalism | 20 pages, 2 figures | Phys.Rev.D68:034020,2003 | 10.1103/PhysRevD.68.034020 | null | hep-ph hep-ex nucl-th | null | We derive the minimal Fock-state expansions of the pion and the photon wave
functions in light-cone formalism, then we calculate the pion-photon and the
photon-pion transition form factors of $\gamma ^{\ast}\pi ^{0}\to \gamma $ and
$\gamma ^{\ast}\gamma \to \pi ^{0}$ processes by employing these
quark-antiquark wave functions of the pion and the photon. We find that our
calculation for the $\gamma ^{\ast}\gamma \to \pi ^{0}$ transition form factor
agrees with the experimental data at low and moderately high energy scale.
Moreover, the physical differences and inherent connections between the
transition form factors of $\gamma ^{\ast}\pi ^{0}\to \gamma $ and $ \gamma
^{\ast}\gamma \to \pi ^{0}$ have been illustrated, which indicate that these
two physical processes are intrinsically related. In addition, we also discuss
the $\pi ^{0}\to \gamma \gamma $ form factor and the decay width $
\mathit{\Gamma}(\pi \to \gamma \gamma)$ at $Q^{2}=0$.
| [
{
"created": "Thu, 11 Dec 2003 21:59:26 GMT",
"version": "v1"
}
] | 2010-01-18 | [
[
"Xiao",
"Bo-Wen",
""
],
[
"Ma",
"Bo-Qiang",
""
]
] | We derive the minimal Fock-state expansions of the pion and the photon wave functions in light-cone formalism, then we calculate the pion-photon and the photon-pion transition form factors of $\gamma ^{\ast}\pi ^{0}\to \gamma $ and $\gamma ^{\ast}\gamma \to \pi ^{0}$ processes by employing these quark-antiquark wave functions of the pion and the photon. We find that our calculation for the $\gamma ^{\ast}\gamma \to \pi ^{0}$ transition form factor agrees with the experimental data at low and moderately high energy scale. Moreover, the physical differences and inherent connections between the transition form factors of $\gamma ^{\ast}\pi ^{0}\to \gamma $ and $ \gamma ^{\ast}\gamma \to \pi ^{0}$ have been illustrated, which indicate that these two physical processes are intrinsically related. In addition, we also discuss the $\pi ^{0}\to \gamma \gamma $ form factor and the decay width $ \mathit{\Gamma}(\pi \to \gamma \gamma)$ at $Q^{2}=0$. |
hep-ph/0602074 | Marcos Rodriguez Cardoso | C.M. Maekawa and M. C. Rodriguez | Masses of Fermions in Supersymmetric Models | 24 pages, 2 figures and 3 tables | JHEP 0604 (2006) 031 | 10.1088/1126-6708/2006/04/031 | null | hep-ph | null | We consider the mass generation for the usual quarks and leptons in some
supersymmetric models. The masses of the top, the bottom, the charm, the tau
and the muon are given at the tree level. All the other quarks and the electron
get their masses at the one loop level in the Minimal Supersymmetric Standard
Model (MSSM) and in two Supersymmetric Left-Right Models, one model uses
triplets (SUSYLRT) to break $SU(2)_{R}$-symmetry and the other use
doublets(SUSYLRD).
| [
{
"created": "Wed, 8 Feb 2006 17:11:54 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Maekawa",
"C. M.",
""
],
[
"Rodriguez",
"M. C.",
""
]
] | We consider the mass generation for the usual quarks and leptons in some supersymmetric models. The masses of the top, the bottom, the charm, the tau and the muon are given at the tree level. All the other quarks and the electron get their masses at the one loop level in the Minimal Supersymmetric Standard Model (MSSM) and in two Supersymmetric Left-Right Models, one model uses triplets (SUSYLRT) to break $SU(2)_{R}$-symmetry and the other use doublets(SUSYLRD). |
hep-ph/9609240 | Jim Cline | James M. Cline and Pierre-Anthony Lemieux | Electroweak Phase Transition in Two Higgs Doublet Models | 18 pp., 5 figures, uses epsf.tex. Corrected matching conditions for
analytic approximation to thermal effective potential, eq. (10), and typos in
eq. (5) | Phys.Rev. D55 (1997) 3873-3881 | 10.1103/PhysRevD.55.3873 | McGill 96-16 | hep-ph | null | We reexamine the strength of the first order phase transition in the
electroweak theory supplemented by an extra Higgs doublet. The
finite-temperature effective potential, $V_{eff}$, is computed to one-loop
order, including the summation of ring diagrams, to study the ratio
$\phi_c/T_c$ of the Higgs field VEV to the critical temperature. We make a
number of improvements over previous treatments, including a consistent
treatment of Goldstone bosons in $V_{eff}$, an accurate analytic approximation
to $V_{eff}$ valid for any mass-to-temperature ratios, and use of the
experimentally measured top quark mass. For two-Higgs doublet models, we
identify a significant region of parameter space where $\phi_c/T_c$ is large
enough for electroweak baryogenesis, and we argue that this identification
should persist even at higher orders in perturbation theory. In the case of the
minimal supersymmetric standard model, our results indicate that the extra
Higgs bosons have little effect on the strength of the phase transition.
| [
{
"created": "Tue, 3 Sep 1996 21:39:03 GMT",
"version": "v1"
},
{
"created": "Fri, 27 Jul 2007 13:04:44 GMT",
"version": "v2"
},
{
"created": "Thu, 23 Aug 2007 19:47:10 GMT",
"version": "v3"
}
] | 2009-10-28 | [
[
"Cline",
"James M.",
""
],
[
"Lemieux",
"Pierre-Anthony",
""
]
] | We reexamine the strength of the first order phase transition in the electroweak theory supplemented by an extra Higgs doublet. The finite-temperature effective potential, $V_{eff}$, is computed to one-loop order, including the summation of ring diagrams, to study the ratio $\phi_c/T_c$ of the Higgs field VEV to the critical temperature. We make a number of improvements over previous treatments, including a consistent treatment of Goldstone bosons in $V_{eff}$, an accurate analytic approximation to $V_{eff}$ valid for any mass-to-temperature ratios, and use of the experimentally measured top quark mass. For two-Higgs doublet models, we identify a significant region of parameter space where $\phi_c/T_c$ is large enough for electroweak baryogenesis, and we argue that this identification should persist even at higher orders in perturbation theory. In the case of the minimal supersymmetric standard model, our results indicate that the extra Higgs bosons have little effect on the strength of the phase transition. |
1608.08501 | Olcyr Sumensari | Damir Be\v{c}irevi\'c, Svjetlana Fajfer, Nejc Ko\v{s}nik, Olcyr
Sumensari | Leptoquark model to explain the $B$-physics anomalies, $R_K$ and $R_D$ | 6 pages, 4 figures | Phys. Rev. D 94, 115021 (2016) | 10.1103/PhysRevD.94.115021 | LPT-Orsay-16-51 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that a model with a scalar leptoquark of hypercharge $Y=1/6$ which
includes the light right-handed neutrinos, can successfully describe both of
the $B$-physics anomalies, $R_K^{\rm exp} < R_K^{\rm SM}$ and $R_D^{\rm exp} >
R_D^{\rm SM}$. We discuss the corresponding low energy effective theory and,
after using the known experimental data as constraints, we show that the model
is viable and that it offers several predictions which can be tested
experimentally.
| [
{
"created": "Tue, 30 Aug 2016 15:30:51 GMT",
"version": "v1"
}
] | 2016-12-28 | [
[
"Bečirević",
"Damir",
""
],
[
"Fajfer",
"Svjetlana",
""
],
[
"Košnik",
"Nejc",
""
],
[
"Sumensari",
"Olcyr",
""
]
] | We show that a model with a scalar leptoquark of hypercharge $Y=1/6$ which includes the light right-handed neutrinos, can successfully describe both of the $B$-physics anomalies, $R_K^{\rm exp} < R_K^{\rm SM}$ and $R_D^{\rm exp} > R_D^{\rm SM}$. We discuss the corresponding low energy effective theory and, after using the known experimental data as constraints, we show that the model is viable and that it offers several predictions which can be tested experimentally. |
hep-ph/9810254 | Randy Lewis | Randy Lewis and Nader Mobed | Isospin violation and the proton's neutral weak magnetic form factor | 26 pages including 9 figures | Phys.Rev.D59:073002,1999 | 10.1103/PhysRevD.59.073002 | JLAB-THY-98-39 | hep-ph nucl-th | null | The effects of isospin violation on the neutral weak magnetic form factor of
the proton are studied using two-flavour chiral perturbation theory. The first
nonzero contributions appear at O(p^4) in the small-momentum expansion, and the
O(p^5) corrections are also calculated. The leading contributions from an
explicit Delta(1232) isomultiplet are included as well. At such a high order in
the chiral expansion, one might have expected a large number of unknown
parameters to contribute. However, it is found that no unknown parameters can
appear within loop diagrams, and a single tree-level counterterm at O(p^4) is
sufficient to absorb all divergences. The momentum dependence of the neutral
weak magnetic form factor is not affected by this counterterm.
| [
{
"created": "Mon, 5 Oct 1998 21:24:17 GMT",
"version": "v1"
}
] | 2009-12-30 | [
[
"Lewis",
"Randy",
""
],
[
"Mobed",
"Nader",
""
]
] | The effects of isospin violation on the neutral weak magnetic form factor of the proton are studied using two-flavour chiral perturbation theory. The first nonzero contributions appear at O(p^4) in the small-momentum expansion, and the O(p^5) corrections are also calculated. The leading contributions from an explicit Delta(1232) isomultiplet are included as well. At such a high order in the chiral expansion, one might have expected a large number of unknown parameters to contribute. However, it is found that no unknown parameters can appear within loop diagrams, and a single tree-level counterterm at O(p^4) is sufficient to absorb all divergences. The momentum dependence of the neutral weak magnetic form factor is not affected by this counterterm. |
2405.18226 | Song Li | Song Li, Jin Min Yang, Mengchao Zhang, Rui Zhu | Theoretical bounds on dark Higgs mass in a self-interacting dark matter
model with $U(1)'$ | 45 pages, 7 figures | null | null | null | hep-ph astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Motivated by the null results of current dark matter searches and the
small-scale problems, we study a dark sector charged by a spontaneous broken
gauge $U(1)'$. To explore the parameter space of this model, in addition to the
consideration of the small-scale data, we also consider the theoretical bounds
on the dark Higgs mass, with the upper bound coming from the tree-level
perturbative unitarity and the lower bound from the one-loop Linde-Weinberg
bound. We deeply examine the dependence of the Linde-Weinberg bound on gauge
choice and energy scale, and present a Linde-Weinberg bound that is gauge and
scale independent. Combining the theoretical and observational constraints, we
obtain the following ranges for the parameter space: the dark matter mass is
10-500 GeV, the mediator (dark photon) mass is 0.5-5 MeV, the dark Higgs mass
is 0.05-50 MeV, and the dark fine-structure constant is 0.001-0.4. We conclude
that the dark Higgs in this model cannot be ignored in the phenomenological
study of the dark sector.
| [
{
"created": "Tue, 28 May 2024 14:37:22 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Jul 2024 06:39:54 GMT",
"version": "v2"
}
] | 2024-07-30 | [
[
"Li",
"Song",
""
],
[
"Yang",
"Jin Min",
""
],
[
"Zhang",
"Mengchao",
""
],
[
"Zhu",
"Rui",
""
]
] | Motivated by the null results of current dark matter searches and the small-scale problems, we study a dark sector charged by a spontaneous broken gauge $U(1)'$. To explore the parameter space of this model, in addition to the consideration of the small-scale data, we also consider the theoretical bounds on the dark Higgs mass, with the upper bound coming from the tree-level perturbative unitarity and the lower bound from the one-loop Linde-Weinberg bound. We deeply examine the dependence of the Linde-Weinberg bound on gauge choice and energy scale, and present a Linde-Weinberg bound that is gauge and scale independent. Combining the theoretical and observational constraints, we obtain the following ranges for the parameter space: the dark matter mass is 10-500 GeV, the mediator (dark photon) mass is 0.5-5 MeV, the dark Higgs mass is 0.05-50 MeV, and the dark fine-structure constant is 0.001-0.4. We conclude that the dark Higgs in this model cannot be ignored in the phenomenological study of the dark sector. |
hep-ph/0110119 | Liu Chun | Chun Liu and Jeonghyeon Song | A Phenomenological Study on Lepton Mass Matrix Textures | 6 pages, revtex, no figures, confusing points corrected,
clarification and refernces added | Phys.Rev.D65:057303,2002 | 10.1103/PhysRevD.65.057303 | AS-ITP-2001-017 | hep-ph | null | The three active light neutrinos are used to explain the neutrino
oscillations. The inherently bi-large mixing neutrino mass matrix and the
Fritzsch type, bi-small mixing charged lepton mass matrix are assumed. By
requiring the maximal \nu_\mu-\nu_\tau mixing for the atmospheric neutrino
problem and the mass-squared difference approperiate for the almost maximal
mixing solution to the solar neutrino problem, the following quantities are
predicted: the \nu_e-\nu_\mu mixing, V_{e3}, CP violation in neutrino
oscillations, and the effective electron-neutrino mass relevant to neutrinoless
double beta decays.
| [
{
"created": "Tue, 9 Oct 2001 10:51:44 GMT",
"version": "v1"
},
{
"created": "Sat, 10 Nov 2001 14:14:35 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Liu",
"Chun",
""
],
[
"Song",
"Jeonghyeon",
""
]
] | The three active light neutrinos are used to explain the neutrino oscillations. The inherently bi-large mixing neutrino mass matrix and the Fritzsch type, bi-small mixing charged lepton mass matrix are assumed. By requiring the maximal \nu_\mu-\nu_\tau mixing for the atmospheric neutrino problem and the mass-squared difference approperiate for the almost maximal mixing solution to the solar neutrino problem, the following quantities are predicted: the \nu_e-\nu_\mu mixing, V_{e3}, CP violation in neutrino oscillations, and the effective electron-neutrino mass relevant to neutrinoless double beta decays. |
1605.06550 | Monika Richter | Bartosz Dziewit, Jacek Holeczek, Monika Richter, Sebastian Zaj\k{a}c,
Marek Zra{\l}ek | The flavour problem and family symmetry beyond the Standard Model | 6 pages, topic presented at XXXIX International Conference of
Theoretical Physics "Matter to the deepest" (Ustron, Poland, September 2015) | Acta Phys.Polon. B46 (2015) no.11, 2399 (2015) | 10.5506/APhysPolB.46.2399 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the frame of two Higgs doublet model we try to explain the lepton masses
and mixing matrix elements assuming that neutrinos are Dirac particles.
Discrete family symmetry groups, which are subgroups of U(3) up to the 1025
order are considered. Like in the one Higgs Standard Model, we found that
discrete family symmetries do not give satisfactory answer for this basic
questions in the flavour problem.
| [
{
"created": "Fri, 20 May 2016 22:12:04 GMT",
"version": "v1"
},
{
"created": "Sat, 18 Jun 2016 14:05:00 GMT",
"version": "v2"
}
] | 2016-06-21 | [
[
"Dziewit",
"Bartosz",
""
],
[
"Holeczek",
"Jacek",
""
],
[
"Richter",
"Monika",
""
],
[
"Zając",
"Sebastian",
""
],
[
"Zrałek",
"Marek",
""
]
] | In the frame of two Higgs doublet model we try to explain the lepton masses and mixing matrix elements assuming that neutrinos are Dirac particles. Discrete family symmetry groups, which are subgroups of U(3) up to the 1025 order are considered. Like in the one Higgs Standard Model, we found that discrete family symmetries do not give satisfactory answer for this basic questions in the flavour problem. |
hep-ph/9504375 | null | C.H. Jin and E.A. Paschos | Inclusive Semileptonic Decays and the Structure of B Mesons | 24 pages, LaTex file, 5 figures added as .EPS files | null | null | DO-TH 95/07 | hep-ph | null | A field theoretic description for inclusive semileptonic B meson decays is
formulated. We argue that large regions of the phase spaces for the decays are
dominated by distances near the light cone. The light-cone dominance allows to
incorporate nonperturbative QCD effects in a distribution function. A
one-to-one correspondence with the heavy quark effective theory is developed,
which can estimate the first two moments of the distribution function. These
conditions are useful but not restrictive enough to specify the distribution
function, which must still be determined from experiment. Several
model-independent predictions, such as scaling, sum rules of the hadronic
structure functions and relations among them, are made. General formulas for
the differential decay rates on several variables are presented, which are used
for calculating the electron energy spectra with an Ansatz for the light-cone
distribution function.
| [
{
"created": "Mon, 24 Apr 1995 14:41:37 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Jin",
"C. H.",
""
],
[
"Paschos",
"E. A.",
""
]
] | A field theoretic description for inclusive semileptonic B meson decays is formulated. We argue that large regions of the phase spaces for the decays are dominated by distances near the light cone. The light-cone dominance allows to incorporate nonperturbative QCD effects in a distribution function. A one-to-one correspondence with the heavy quark effective theory is developed, which can estimate the first two moments of the distribution function. These conditions are useful but not restrictive enough to specify the distribution function, which must still be determined from experiment. Several model-independent predictions, such as scaling, sum rules of the hadronic structure functions and relations among them, are made. General formulas for the differential decay rates on several variables are presented, which are used for calculating the electron energy spectra with an Ansatz for the light-cone distribution function. |
2006.08490 | David Arturo Amor Quiroz | David Arturo Amor-Quiroz, Matthias Burkardt, William Focillon and
C\'edric Lorc\'e | Study of the potential transverse momentum and potential angular
momentum within the scalar diquark model | Presented at the Workshop of QCD and Forward Physics at the EIC, the
LHC, and Cosmic Ray Physics in Guanajuato, Mexico, November 18-21 2019 | null | null | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We make use of a simple scalar diquark model to study the potential
transverse momentum and potential angular momentum, defined as the difference
between the Jaffe-Manohar and Ji notions of transverse momentum and orbital
angular momentum, respectively. A non-vanishing potential angular momentum has
been previously found in lattice calculations and is believed to appear due to
the effects of initial/final state interactions between the spectator system
and the struck quark in high energy scattering processes. Such re-scattering
phenomena are similar in nature to those who are responsible for generating the
Sivers shift. This motivates us to search for an estimate of the potential
angular momentum in terms of the expectation value of the transverse momentum
of the struck quark.
| [
{
"created": "Mon, 15 Jun 2020 15:48:45 GMT",
"version": "v1"
}
] | 2020-06-16 | [
[
"Amor-Quiroz",
"David Arturo",
""
],
[
"Burkardt",
"Matthias",
""
],
[
"Focillon",
"William",
""
],
[
"Lorcé",
"Cédric",
""
]
] | We make use of a simple scalar diquark model to study the potential transverse momentum and potential angular momentum, defined as the difference between the Jaffe-Manohar and Ji notions of transverse momentum and orbital angular momentum, respectively. A non-vanishing potential angular momentum has been previously found in lattice calculations and is believed to appear due to the effects of initial/final state interactions between the spectator system and the struck quark in high energy scattering processes. Such re-scattering phenomena are similar in nature to those who are responsible for generating the Sivers shift. This motivates us to search for an estimate of the potential angular momentum in terms of the expectation value of the transverse momentum of the struck quark. |
2404.07822 | Benjamin Lieberman B | Benjamin Lieberman, Salah-Eddine Dahbi, Andreas Crivellin, Finn
Stevenson, Nidhi Tripathi, Mukesh Kumar and Bruce Mellado | Trials Factor for Semi-Supervised NN Classifiers in Searches for Narrow
Resonances at the LHC | 21 pages, 14 figures, with few minor corrections | null | null | ICPP-80 | hep-ph | http://creativecommons.org/publicdomain/zero/1.0/ | To mitigate the model dependencies of searches for new narrow resonances at
the Large Hadron Collider (LHC), semi-supervised Neural Networks (NNs) can be
used. Unlike fully supervised classifiers these models introduce an additional
look-elsewhere effect in the process of optimising thresholds on the response
distribution. We perform a frequentist study to quantify this effect, in the
form of a trials factor. As an example, we consider simulated $Z\gamma$ data to
perform narrow resonance searches using semi-supervised NN classifiers. The
results from this analysis provide substantiation that the look-elsewhere
effect induced by the semi-supervised NN is under control.
| [
{
"created": "Thu, 11 Apr 2024 15:06:15 GMT",
"version": "v1"
},
{
"created": "Thu, 27 Jun 2024 10:21:48 GMT",
"version": "v2"
},
{
"created": "Thu, 8 Aug 2024 09:07:24 GMT",
"version": "v3"
}
] | 2024-08-09 | [
[
"Lieberman",
"Benjamin",
""
],
[
"Dahbi",
"Salah-Eddine",
""
],
[
"Crivellin",
"Andreas",
""
],
[
"Stevenson",
"Finn",
""
],
[
"Tripathi",
"Nidhi",
""
],
[
"Kumar",
"Mukesh",
""
],
[
"Mellado",
"Bruce",
""
... | To mitigate the model dependencies of searches for new narrow resonances at the Large Hadron Collider (LHC), semi-supervised Neural Networks (NNs) can be used. Unlike fully supervised classifiers these models introduce an additional look-elsewhere effect in the process of optimising thresholds on the response distribution. We perform a frequentist study to quantify this effect, in the form of a trials factor. As an example, we consider simulated $Z\gamma$ data to perform narrow resonance searches using semi-supervised NN classifiers. The results from this analysis provide substantiation that the look-elsewhere effect induced by the semi-supervised NN is under control. |
1210.0580 | Thomas Becher | Thomas Becher and Guido Bell | NNLL Resummation for Jet Broadening | 44 pages, 9 figures | null | 10.1007/JHEP11(2012)126 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The resummation for the event-shape variable jet broadening is extended to
next-to-next-to-leading logarithmic accuracy by computing the relevant jet and
soft functions at one-loop order and the collinear anomaly to two-loop
accuracy. The anomaly coefficient is extracted from the soft function and
expressed in terms of polylogarithmic as well as elliptic functions. With our
results, the uncertainty on jet-broadening distributions is reduced
significantly, which should allow for a precise determination of the strong
coupling constant from the existing experimental data and provide a consistency
check on the extraction of alpha_s from higher-log resummations of thrust.
| [
{
"created": "Mon, 1 Oct 2012 21:10:53 GMT",
"version": "v1"
}
] | 2015-06-11 | [
[
"Becher",
"Thomas",
""
],
[
"Bell",
"Guido",
""
]
] | The resummation for the event-shape variable jet broadening is extended to next-to-next-to-leading logarithmic accuracy by computing the relevant jet and soft functions at one-loop order and the collinear anomaly to two-loop accuracy. The anomaly coefficient is extracted from the soft function and expressed in terms of polylogarithmic as well as elliptic functions. With our results, the uncertainty on jet-broadening distributions is reduced significantly, which should allow for a precise determination of the strong coupling constant from the existing experimental data and provide a consistency check on the extraction of alpha_s from higher-log resummations of thrust. |
2203.08039 | Ian Shoemaker | Asli M. Abdullahi, Pablo Barham Alzas, Brian Batell, Alexey Boyarsky,
Saneli Carbajal, Animesh Chatterjee, Jose I. Crespo-Anadon, Frank F.
Deppisch, Albert De Roeck, Marco Drewes, Alberto Martin Gago, Rebeca Gonzalez
Suarez, Evgueni Goudzovski, Athanasios Hatzikoutelis, Marco Hufnagel, Philip
Ilten, Alexander Izmaylov, Kevin J. Kelly, Juraj Klaric, Joachim Kopp,
Suchita Kulkarni, Mathieu Lamoureux, Gaia Lanfranchi, Jacobo Lopez-Pavon,
Oleksii Mikulenko, Michael Mooney, Miha Nemevsek, Maksym Ovchynnikov, Silvia
Pascoli, Ryan Plestid, Mohamed Rashad Darwish, Federico Leo Redi, Oleg
Ruchayskiy, Richard Ruiz, Mikhail Shaposhnikov, Ian M. Shoemaker, Robert
Shrock, Alex Sousa, Nick Van Remortel, Vsevolod Syvolap, Volodymyr Takhistov,
Jean-Loup Tastet, Inar Timiryasov, Aaron C. Vincent, Jaehoon Yu | The Present and Future Status of Heavy Neutral Leptons | 82 pages, 34 figures. Contribution to Snowmass 2021 | null | 10.1088/1361-6471/ac98f9 | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | The existence of non-zero neutrino masses points to the likely existence of
multiple SM neutral fermions. When such states are heavy enough that they
cannot be produced in oscillations, they are referred to as Heavy Neutral
Leptons (HNLs). In this white paper we discuss the present experimental status
of HNLs including colliders, beta decay, accelerators, as well as astrophysical
and cosmological impacts. We discuss the importance of continuing to search for
HNLs, and its potential impact on our understanding on key fundamental
questions, and additionally we outline the future prospects for next-generation
future experiments or upcoming accelerator run scenarios.
| [
{
"created": "Tue, 15 Mar 2022 16:21:35 GMT",
"version": "v1"
}
] | 2023-02-01 | [
[
"Abdullahi",
"Asli M.",
""
],
[
"Alzas",
"Pablo Barham",
""
],
[
"Batell",
"Brian",
""
],
[
"Boyarsky",
"Alexey",
""
],
[
"Carbajal",
"Saneli",
""
],
[
"Chatterjee",
"Animesh",
""
],
[
"Crespo-Anadon",
"Jose I.... | The existence of non-zero neutrino masses points to the likely existence of multiple SM neutral fermions. When such states are heavy enough that they cannot be produced in oscillations, they are referred to as Heavy Neutral Leptons (HNLs). In this white paper we discuss the present experimental status of HNLs including colliders, beta decay, accelerators, as well as astrophysical and cosmological impacts. We discuss the importance of continuing to search for HNLs, and its potential impact on our understanding on key fundamental questions, and additionally we outline the future prospects for next-generation future experiments or upcoming accelerator run scenarios. |
2401.15651 | Yanbing Cai | Yanbing Cai, Xiaopeng Wang, Xurong Chen | New exact analytical solution of the nonlinear
Gribov-Levin-Ryskin-Mueller-Qiu equation | 13 pages, 3 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The GLR-MQ equation is a nonlinear evolution equation that takes into account
the shadowing effect, which tames the growth of the gluon at small-$x$. In this
study, we analytically solve for the first time the nonlinear GLR-MQ equation
using the homogeneous balance method. The definite solution of the GLR-MQ
equation is obtained by fitting the MSTW2008LO gluon distribution data. We find
that the geometric scaling is an intrinsic property of our analytical solution
and the gluon distribution functions from our solution are able to reproduce
the MSTW2008LO data. These results indicate that our analytical solution from
the homogeneous balance method is valid to describe the gluon behavior at
small-$x$. Moreover, the saturation scale $Q_s$ has been extracted from our
analytical solution, we find that the energy-dependent saturation scale obeys
the exponential law $Q_s^2\,\propto\,Q_0^2 e^{\lambda Y}$.
| [
{
"created": "Sun, 28 Jan 2024 13:00:30 GMT",
"version": "v1"
}
] | 2024-01-30 | [
[
"Cai",
"Yanbing",
""
],
[
"Wang",
"Xiaopeng",
""
],
[
"Chen",
"Xurong",
""
]
] | The GLR-MQ equation is a nonlinear evolution equation that takes into account the shadowing effect, which tames the growth of the gluon at small-$x$. In this study, we analytically solve for the first time the nonlinear GLR-MQ equation using the homogeneous balance method. The definite solution of the GLR-MQ equation is obtained by fitting the MSTW2008LO gluon distribution data. We find that the geometric scaling is an intrinsic property of our analytical solution and the gluon distribution functions from our solution are able to reproduce the MSTW2008LO data. These results indicate that our analytical solution from the homogeneous balance method is valid to describe the gluon behavior at small-$x$. Moreover, the saturation scale $Q_s$ has been extracted from our analytical solution, we find that the energy-dependent saturation scale obeys the exponential law $Q_s^2\,\propto\,Q_0^2 e^{\lambda Y}$. |
1605.08579 | A. Cooper-Sarkar | A.M.Cooper-Sarkar (for the LHeC study group) | Improved measurement of parton distribution functions and
$\alpha_s(M_Z)$ with the LHeC | 6 pages, 8 figures, proceedings of the XXIV International Workshop on
Deep-Inelastic Scattering and Related Subjects. arXiv admin note: substantial
text overlap with arXiv:1310.0662 | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The potential of the LHeC, a future electron-proton collider, for precision
Deep Inelastic Scattering measurements is reviewed with particular emphasis on
the reduction of uncertainties on the parton distribution functions (PDFs) of
the proton and on the measurement of $\alpha_s(M_Z)$. The interpretation of
possible Beyond Standard Model (BSM) signals at the LHC is crucially dependent
on precise knowledge of the predictions of the Standard Model (SM) and the
uncertainties on PDFs and $\alpha_s(M_Z) $are a limiting factor. The LHeC
project, running in parallel with later stages of LHC running, would provide
much improved precision on the PDFs as compared to the precision expected from
LHC data alone.
| [
{
"created": "Fri, 27 May 2016 11:00:55 GMT",
"version": "v1"
}
] | 2019-08-14 | [
[
"Cooper-Sarkar",
"A. M.",
"",
"for the LHeC study group"
]
] | The potential of the LHeC, a future electron-proton collider, for precision Deep Inelastic Scattering measurements is reviewed with particular emphasis on the reduction of uncertainties on the parton distribution functions (PDFs) of the proton and on the measurement of $\alpha_s(M_Z)$. The interpretation of possible Beyond Standard Model (BSM) signals at the LHC is crucially dependent on precise knowledge of the predictions of the Standard Model (SM) and the uncertainties on PDFs and $\alpha_s(M_Z) $are a limiting factor. The LHeC project, running in parallel with later stages of LHC running, would provide much improved precision on the PDFs as compared to the precision expected from LHC data alone. |
hep-ph/0210199 | Karol Kolodziej | Karol Kolodziej | eett6f v. 1.0, A program for top quark pair production and decay into 6
fermions at linear colliders | 19 pages, submitted to Comput. Phys. Commun | Comput.Phys.Commun. 151 (2003) 339-353 | 10.1016/S0010-4655(02)00738-5 | null | hep-ph | null | The first version of a computer program "eett6f" for calculating cross
sections of e+e- -> 6 fermions processes relevant for a t\bar{t}-pair
production and decay at centre of mass energies typical for linear colliders is
presented. "eett6f v.~1.0" allows for calculating both the total and
differential cross sections at tree level of the Standard Model. The program
can be used as the Monte Carlo generator of unweighted events as well.
| [
{
"created": "Mon, 14 Oct 2002 08:49:44 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Kolodziej",
"Karol",
""
]
] | The first version of a computer program "eett6f" for calculating cross sections of e+e- -> 6 fermions processes relevant for a t\bar{t}-pair production and decay at centre of mass energies typical for linear colliders is presented. "eett6f v.~1.0" allows for calculating both the total and differential cross sections at tree level of the Standard Model. The program can be used as the Monte Carlo generator of unweighted events as well. |
0802.2954 | Kirill Tuchin | Yang Li, Kirill Tuchin | Gluon multiplicity in coherent diffraction of onium on a heavy nucleus | 21 pages, 5 figures | Phys.Rev.D77:114012,2008 | 10.1103/PhysRevD.77.114012 | RBRC-729 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive the cross section for the diffractive gluon production in high
energy onium-nucleus collisions that includes the low-x evolution effects in
the rapidity interval between the onium and the produced gluon and in the
rapidity interval between the gluon and the target nucleus. We analyze our
result in two limiting cases: when the onium size is much smaller than the
saturation scale and when its size is much larger than the saturation scale. In
the later case the gluon multiplicity is very small in the quasi-classical case
and increases when the low-x evolution effects in onium become significant. We
discuss the implications of our result for the RHIC, LHC and EIC phenomenology.
| [
{
"created": "Wed, 20 Feb 2008 22:21:36 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Apr 2008 15:46:09 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Li",
"Yang",
""
],
[
"Tuchin",
"Kirill",
""
]
] | We derive the cross section for the diffractive gluon production in high energy onium-nucleus collisions that includes the low-x evolution effects in the rapidity interval between the onium and the produced gluon and in the rapidity interval between the gluon and the target nucleus. We analyze our result in two limiting cases: when the onium size is much smaller than the saturation scale and when its size is much larger than the saturation scale. In the later case the gluon multiplicity is very small in the quasi-classical case and increases when the low-x evolution effects in onium become significant. We discuss the implications of our result for the RHIC, LHC and EIC phenomenology. |
1101.5158 | Moritz McGarrie | Moritz McGarrie | Hybrid Gauge Mediation | 20 pages, 10 figures. Version accepted by JHEP | null | 10.1007/JHEP09(2011)138 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Inspired by four dimensional (de)constructions, we use the framework of
"General gauge mediation in five dimensions" to interpolate between gaugino and
ordinary gauge mediation. In particular we emphasise that an intermediate
hybrid regime of mediation may be obtained in these higher dimensional models
as has been obtained in the quiver gauge models.
| [
{
"created": "Wed, 26 Jan 2011 21:00:10 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Sep 2011 15:53:08 GMT",
"version": "v2"
}
] | 2015-05-27 | [
[
"McGarrie",
"Moritz",
""
]
] | Inspired by four dimensional (de)constructions, we use the framework of "General gauge mediation in five dimensions" to interpolate between gaugino and ordinary gauge mediation. In particular we emphasise that an intermediate hybrid regime of mediation may be obtained in these higher dimensional models as has been obtained in the quiver gauge models. |
2202.09358 | Stanley Deser | S.Deser | The Anthropic (and Mis-) Principle revisited, Steven Weinberg in
Memoriam | published version | EPL 139, 6902(2022) | 10.1209/0295-5075/ac8e29 | BRX-TH-6702; CALT-TH-2022-008 | hep-ph gr-qc | http://creativecommons.org/licenses/by/4.0/ | I review the role and meaning of the Anthropic Principle, particularly in its
relevance to particle physics.
| [
{
"created": "Fri, 18 Feb 2022 21:30:14 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Dec 2022 00:36:19 GMT",
"version": "v2"
}
] | 2022-12-12 | [
[
"Deser",
"S.",
""
]
] | I review the role and meaning of the Anthropic Principle, particularly in its relevance to particle physics. |
hep-ph/0604043 | Johan Bijnens | Johan Bijnens (Lund) | Chiral Perturbation Theory Beyond One Loop | 66 pages, review article, some references added plus a few
discussions extended | Prog.Part.Nucl.Phys.58:521-586,2007 | 10.1016/j.ppnp.2006.08.002 | LU TP 06-16 | hep-ph | null | The existing Chiral Perturbation Theory (ChPT) calculations at order $p^6$
are reviewed. The principles of ChPT and how they are used are introduced. The
main part is a review of the two- and three-flavour full two-loop calculations
and their comparison with experiment. We restrict the discussion to the mesonic
purely strong and semileptonic sector. The review concludes by mentioning the
existing results in finite volume, finite temperature and partially quenched
ChPT.
| [
{
"created": "Wed, 5 Apr 2006 12:10:46 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Aug 2006 09:12:10 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Bijnens",
"Johan",
"",
"Lund"
]
] | The existing Chiral Perturbation Theory (ChPT) calculations at order $p^6$ are reviewed. The principles of ChPT and how they are used are introduced. The main part is a review of the two- and three-flavour full two-loop calculations and their comparison with experiment. We restrict the discussion to the mesonic purely strong and semileptonic sector. The review concludes by mentioning the existing results in finite volume, finite temperature and partially quenched ChPT. |
1811.01948 | Graham White Dr | Anupam Mazumdar and Graham White | Cosmic phase transitions: their applications and experimental signatures | 87 pages, 35 figures, review. Converted to JHEP format for
compatibility and convenience with lower quality figures to keep file size
manageable. Accepted version. Added citations, fixed a few typos and added a
well deserved acknowledgement | null | 10.1088/1361-6633/ab1f55 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The study of cosmic phase transitions are of central interest in modern
cosmology. In the standard model of cosmology the Universe begins in a very hot
state, right after at the end of inflation via the process of
reheating/preheating, and cools to its present temperature as the Universe
expands. Both new and existing physics at any scale can be responsible for
catalyzing either first, second or cross over phase transition, which could be
either thermal or non-thermal with a potential observable imprints. Thus this
field prompts a rich dialogue between gravity, particle physics and cosmology.
It is all but certain that at least two cosmic phase transitions have occurred
- the electroweak and the QCD phase transitions. The focus of this review will
be primarily on phase transitions above such scales, We review different types
of phase transitions that can appear in our cosmic history, and their
applications and experimental signatures in particular in the context of
exciting gravitational waves, which could be potentially be constrained by
LIGO/VIRGO, Kagra, and eLISA.
| [
{
"created": "Mon, 5 Nov 2018 19:00:00 GMT",
"version": "v1"
},
{
"created": "Mon, 6 May 2019 19:10:34 GMT",
"version": "v2"
},
{
"created": "Wed, 18 Dec 2019 20:09:18 GMT",
"version": "v3"
}
] | 2019-12-20 | [
[
"Mazumdar",
"Anupam",
""
],
[
"White",
"Graham",
""
]
] | The study of cosmic phase transitions are of central interest in modern cosmology. In the standard model of cosmology the Universe begins in a very hot state, right after at the end of inflation via the process of reheating/preheating, and cools to its present temperature as the Universe expands. Both new and existing physics at any scale can be responsible for catalyzing either first, second or cross over phase transition, which could be either thermal or non-thermal with a potential observable imprints. Thus this field prompts a rich dialogue between gravity, particle physics and cosmology. It is all but certain that at least two cosmic phase transitions have occurred - the electroweak and the QCD phase transitions. The focus of this review will be primarily on phase transitions above such scales, We review different types of phase transitions that can appear in our cosmic history, and their applications and experimental signatures in particular in the context of exciting gravitational waves, which could be potentially be constrained by LIGO/VIRGO, Kagra, and eLISA. |
1510.05797 | Luca Silvestrini | Luca Silvestrini | CHARM-2015 Theory Summary | To be published in the proceedings of CHARM-2015, Detroit, MI, 18-22
May 2015 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I present a brief theory overview of the CHARM-2015 conference.
| [
{
"created": "Tue, 20 Oct 2015 08:57:47 GMT",
"version": "v1"
}
] | 2015-10-21 | [
[
"Silvestrini",
"Luca",
""
]
] | I present a brief theory overview of the CHARM-2015 conference. |
hep-ph/0512009 | Ferruccio Feruglio | Ferruccio Feruglio | Maximal Neutrino Mixing from Discrete Symmetry in Extra Dimensions | 3 pages, 1 figure, contribution to proc. of the Int. Europhysics
Conf. on High Energy Physics (HEP2005) July 21th-27th 2005, Lisboa, Portugal | null | null | PoS(HEP2005)185 | hep-ph | null | I review the construction of a model for lepton masses based on the flavour
symmetry group A4 x U(1) reproducing the so-called tri-bimaximal lepton mixing
scheme, in eccelent agreement with current data. The model predicts a neutrino
spectrum of normal hierarchy type, not far from degenerate. A testable relation
between neutrino masses is obtained. I shortly discuss also general
requirements for models based on spontaneously broken flavour symmetries, in
order to get a maximal atmospheric mixing angle.
| [
{
"created": "Thu, 1 Dec 2005 10:41:16 GMT",
"version": "v1"
}
] | 2009-04-25 | [
[
"Feruglio",
"Ferruccio",
""
]
] | I review the construction of a model for lepton masses based on the flavour symmetry group A4 x U(1) reproducing the so-called tri-bimaximal lepton mixing scheme, in eccelent agreement with current data. The model predicts a neutrino spectrum of normal hierarchy type, not far from degenerate. A testable relation between neutrino masses is obtained. I shortly discuss also general requirements for models based on spontaneously broken flavour symmetries, in order to get a maximal atmospheric mixing angle. |
1707.06906 | Jun Song | Xing-rui Gou, Feng-lan Shao, Rui-qin Wang, Hai-hong Li, and Jun Song | New insights into hadron production mechanism from $p_{T}$ spectra in
$pp$ collisions at $\sqrt{s}=7$ TeV | 11 pages, 10 figures | Phys. Rev. D 96, 094010 (2017) | 10.1103/PhysRevD.96.094010 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the experimental data of mid-rapidity $p_{T}$ spectra for
proton, $\Lambda$, $\Xi$ , $\Omega^{-}$, $\text{K(892)}^{*0}$ and
$\Xi(1530)^{*0}$ in minimum-bias $pp$ collisions at $\sqrt{s}=7$ TeV can be
systemically explained by the quark combination mechanism of hadronization. The
averaged transverse momentum $\langle p_{T}\rangle$ and spectra ratios such as
$\Xi/\Lambda$ and $\Omega/\phi$ calculated from quark combination reproduce the
data much better than those from traditional string and/or cluster
fragmentation. The available data of hadronic $p_{T}$ spectra released by ALICE
collaboration in the first three high-multiplicity classes of $pp$ collisions
at $\sqrt{s}=7$ TeV are also well explained. We make predictions for other
hadrons, and propose two scaling behaviors among decuplet baryons and vector
mesons as the effective probe of hadron production mechanism at such high
collision energy.
| [
{
"created": "Fri, 21 Jul 2017 14:05:00 GMT",
"version": "v1"
},
{
"created": "Sat, 19 Aug 2017 02:56:56 GMT",
"version": "v2"
}
] | 2017-11-22 | [
[
"Gou",
"Xing-rui",
""
],
[
"Shao",
"Feng-lan",
""
],
[
"Wang",
"Rui-qin",
""
],
[
"Li",
"Hai-hong",
""
],
[
"Song",
"Jun",
""
]
] | We show that the experimental data of mid-rapidity $p_{T}$ spectra for proton, $\Lambda$, $\Xi$ , $\Omega^{-}$, $\text{K(892)}^{*0}$ and $\Xi(1530)^{*0}$ in minimum-bias $pp$ collisions at $\sqrt{s}=7$ TeV can be systemically explained by the quark combination mechanism of hadronization. The averaged transverse momentum $\langle p_{T}\rangle$ and spectra ratios such as $\Xi/\Lambda$ and $\Omega/\phi$ calculated from quark combination reproduce the data much better than those from traditional string and/or cluster fragmentation. The available data of hadronic $p_{T}$ spectra released by ALICE collaboration in the first three high-multiplicity classes of $pp$ collisions at $\sqrt{s}=7$ TeV are also well explained. We make predictions for other hadrons, and propose two scaling behaviors among decuplet baryons and vector mesons as the effective probe of hadron production mechanism at such high collision energy. |
0811.0394 | Puneet Batra | Puneet Batra, Z. Chacko | A Composite Twin Higgs Model | 6 pages, 1 figure | Phys.Rev.D79:095012,2009 | 10.1103/PhysRevD.79.095012 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Twin Higgs models are economical extensions of the Standard Model that
stabilize the electroweak scale. In these theories the Higgs field is a pseudo
Nambu-Goldstone boson that is protected against radiative corrections up to
scales of order 5 TeV by a discrete parity symmetry. We construct, for the
first time, a class of composite twin Higgs models based on confining QCD-like
dynamics. These theories naturally incoporate a custodial isospin symmetry and
predict a rich spectrum of particles with masses of order a TeV that will be
accessible at the LHC.
| [
{
"created": "Mon, 3 Nov 2008 21:07:51 GMT",
"version": "v1"
}
] | 2009-07-30 | [
[
"Batra",
"Puneet",
""
],
[
"Chacko",
"Z.",
""
]
] | Twin Higgs models are economical extensions of the Standard Model that stabilize the electroweak scale. In these theories the Higgs field is a pseudo Nambu-Goldstone boson that is protected against radiative corrections up to scales of order 5 TeV by a discrete parity symmetry. We construct, for the first time, a class of composite twin Higgs models based on confining QCD-like dynamics. These theories naturally incoporate a custodial isospin symmetry and predict a rich spectrum of particles with masses of order a TeV that will be accessible at the LHC. |
2307.05176 | David Alonso-Gonz\'alez | David Alonso-Gonz\'alez, Dorian W. P. Amaral, Adriana
Bariego-Quintana, David Cerdeno and Mart\'in de los Rios | Measuring the Sterile Neutrino Mass in Spallation Source and Direct
Detection Experiments | 22 pages, 10 figures. Minor changes | null | null | IFT-UAM/CSIC-23-89 | hep-ph astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | We explore the complementarity of direct detection (DD) and spallation source
(SS) experiments for the study of sterile neutrino physics. We focus on the
sterile baryonic neutrino model: an extension of the Standard Model that
introduces a massive sterile neutrino with couplings to the quark sector via a
new gauge boson. In this scenario, the inelastic scattering of an active
neutrino with the target material in both DD and SS experiments gives rise to a
characteristic nuclear recoil energy spectrum that can allow for the
reconstruction of the neutrino mass in the event of a positive detection. We
first derive new bounds on this model based on the data from the COHERENT
collaboration on CsI and LAr targets, which we find do not yet probe new areas
of the parameter space. We then assess how well future SS experiments will be
able to measure the sterile neutrino mass and mixings, showing that masses in
the range 15-50 MeV can be reconstructed. We show that there is a degeneracy in
the measurement of the sterile neutrino mixing that substantially affects the
reconstruction of parameters for masses of the order of 40 MeV. Thanks to their
lower energy threshold and sensitivity to the solar tau neutrino flux, DD
experiments allow us to partially lift the degeneracy in the sterile neutrino
mixings and considerably improve its mass reconstruction down to 9 MeV. Our
results demonstrate the excellent complementarity between DD and SS experiments
in measuring the sterile neutrino mass and highlight the power of DD
experiments in searching for new physics in the neutrino sector.
| [
{
"created": "Tue, 11 Jul 2023 11:14:39 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Aug 2023 10:58:18 GMT",
"version": "v2"
}
] | 2023-08-03 | [
[
"Alonso-González",
"David",
""
],
[
"Amaral",
"Dorian W. P.",
""
],
[
"Bariego-Quintana",
"Adriana",
""
],
[
"Cerdeno",
"David",
""
],
[
"Rios",
"Martín de los",
""
]
] | We explore the complementarity of direct detection (DD) and spallation source (SS) experiments for the study of sterile neutrino physics. We focus on the sterile baryonic neutrino model: an extension of the Standard Model that introduces a massive sterile neutrino with couplings to the quark sector via a new gauge boson. In this scenario, the inelastic scattering of an active neutrino with the target material in both DD and SS experiments gives rise to a characteristic nuclear recoil energy spectrum that can allow for the reconstruction of the neutrino mass in the event of a positive detection. We first derive new bounds on this model based on the data from the COHERENT collaboration on CsI and LAr targets, which we find do not yet probe new areas of the parameter space. We then assess how well future SS experiments will be able to measure the sterile neutrino mass and mixings, showing that masses in the range 15-50 MeV can be reconstructed. We show that there is a degeneracy in the measurement of the sterile neutrino mixing that substantially affects the reconstruction of parameters for masses of the order of 40 MeV. Thanks to their lower energy threshold and sensitivity to the solar tau neutrino flux, DD experiments allow us to partially lift the degeneracy in the sterile neutrino mixings and considerably improve its mass reconstruction down to 9 MeV. Our results demonstrate the excellent complementarity between DD and SS experiments in measuring the sterile neutrino mass and highlight the power of DD experiments in searching for new physics in the neutrino sector. |
hep-ph/0610116 | Paul Frampton | P.H. frampton | Proton Decay in Teravolt Unification | 4 pages latex | Mod.Phys.Lett.A22:347-350,2007 | 10.1142/S0217732307022761 | null | hep-ph astro-ph hep-th | null | Model building based on abelian quiver gauge theories gives models which
resemble trinification, originally proposed with yottavolt unification.
However, unification occurs in the teravolt range so proton decay must be
completely excluded in the scalar sector. It is straightforward to accomplish
this by a discrete symmetry which is a generalized baryon number B. Unlike in
trinification, this is possible because quarks and leptons acquire masses from
relevant operators which appear in four-dimensional conformal symmetry
breaking.
| [
{
"created": "Tue, 10 Oct 2006 19:50:29 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"frampton",
"P. H.",
""
]
] | Model building based on abelian quiver gauge theories gives models which resemble trinification, originally proposed with yottavolt unification. However, unification occurs in the teravolt range so proton decay must be completely excluded in the scalar sector. It is straightforward to accomplish this by a discrete symmetry which is a generalized baryon number B. Unlike in trinification, this is possible because quarks and leptons acquire masses from relevant operators which appear in four-dimensional conformal symmetry breaking. |
hep-ph/9807508 | Cao Jun | Jun Cao, Fu-Guang Cao, Tao Huang, and Bo-Qiang Ma | Electromagnetic Transition Form Factor of Pseudoscalar Meson and
$\eta-\eta'$ Mixing | 13 pages, RevTeX, 4 ps figures, to appear in Phys. Rev. D | Phys.Rev. D58 (1998) 113006 | 10.1103/PhysRevD.58.113006 | BIHEP-TH-97-21 | hep-ph | null | The electromagnetic transition form factors of $\eta$ and $\eta'$ are
calculated in the light-cone perturbation theory. We show that it is unreliable
to determine the \eta-\etap'$ mixing angle without any additional normalization
conditions other than their decay widthes to two photons. The possible
intrinsic $c\bar{c}$ component in the flavor singlet is investigated. The heavy
quark pair has distinct properties from the light ones in electromagnetic
transition processes of pseudoscalar mesons. It is possible to explore the size
of $c\bar{c}$ component and our numerical results disfavor a large portion of
$c\bar{c}$ component.
| [
{
"created": "Mon, 27 Jul 1998 11:17:21 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Cao",
"Jun",
""
],
[
"Cao",
"Fu-Guang",
""
],
[
"Huang",
"Tao",
""
],
[
"Ma",
"Bo-Qiang",
""
]
] | The electromagnetic transition form factors of $\eta$ and $\eta'$ are calculated in the light-cone perturbation theory. We show that it is unreliable to determine the \eta-\etap'$ mixing angle without any additional normalization conditions other than their decay widthes to two photons. The possible intrinsic $c\bar{c}$ component in the flavor singlet is investigated. The heavy quark pair has distinct properties from the light ones in electromagnetic transition processes of pseudoscalar mesons. It is possible to explore the size of $c\bar{c}$ component and our numerical results disfavor a large portion of $c\bar{c}$ component. |
1609.03403 | Jihn E. Kim | Jihn E. Kim | Type-II Leptogenesis | 5 pages with 5 figures. Talk presented at ICHEP 2016, Chicago, August
6, 2016 | null | null | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I will talk on our new theory on baryogenesis through type-II leptogenesis
which is different from the well-known type-I leptogenesis. I will comment on
the Jarlskog phases, $\delta_{\rm CKM}$ and $\delta_{\rm PMNS}$, in the CKM and
PMNS matrices. In the type-II leptogenesis, the PMNS phase is used for
Sakharov's condition on the global quantum number generation in the Universe.
For this to be effective, the SU(2)$\times$U(1) gauge symmetry must be broken
during the leptogenesis epoch.
| [
{
"created": "Mon, 12 Sep 2016 13:55:39 GMT",
"version": "v1"
},
{
"created": "Sun, 18 Sep 2016 21:14:11 GMT",
"version": "v2"
}
] | 2016-09-20 | [
[
"Kim",
"Jihn E.",
""
]
] | I will talk on our new theory on baryogenesis through type-II leptogenesis which is different from the well-known type-I leptogenesis. I will comment on the Jarlskog phases, $\delta_{\rm CKM}$ and $\delta_{\rm PMNS}$, in the CKM and PMNS matrices. In the type-II leptogenesis, the PMNS phase is used for Sakharov's condition on the global quantum number generation in the Universe. For this to be effective, the SU(2)$\times$U(1) gauge symmetry must be broken during the leptogenesis epoch. |
1304.7885 | Yoshiharu Kawamura | Yoshiharu Kawamura | Tera Scale Remnants of Unification and Supersymmetry at Planck Scale | 6 pages; minor changes, reference added, typos corrected | null | 10.1093/ptep/ptt055 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We predict new particles at the Tera scale based on the assumptions that the
standard model gauge interactions are unified around the gravitational scale
with a big desert and new particles originate from hypermultiplets as remnants
of supersymmetry, and propose a theoretical framework at the Tera scale and
beyond, that has predictability.
| [
{
"created": "Tue, 30 Apr 2013 05:33:23 GMT",
"version": "v1"
},
{
"created": "Mon, 6 May 2013 00:47:31 GMT",
"version": "v2"
}
] | 2016-06-21 | [
[
"Kawamura",
"Yoshiharu",
""
]
] | We predict new particles at the Tera scale based on the assumptions that the standard model gauge interactions are unified around the gravitational scale with a big desert and new particles originate from hypermultiplets as remnants of supersymmetry, and propose a theoretical framework at the Tera scale and beyond, that has predictability. |
hep-ph/0609068 | Gabriel Shaughnessy | Vernon Barger, Paul Langacker, and Gabe Shaughnessy | Neutralino Signatures of the Singlet Extended MSSM | v1: 19 pages, 6 figures. v2: PLB version | Phys.Lett.B644:361-369,2007 | 10.1016/j.physletb.2006.11.043 | MADPH-1471, UPR-1160-T | hep-ph | null | Extending the Higgs sector of the MSSM by the addition of a gauge singlet
scalar field can remedy the mu problem. We explore the implications of extended
models for both the spectrum of the neutralinos and the cascade decays of the
neutralinos and charginos. Extra steps due to light decoupled neutralinos in
the cascade decays of both neutralinos and charginos allow an excess of
trilepton events compared to the MSSM and the existence of events with higher
lepton multiplicity. Additionally, displaced vertices of the chi_2^0 due to
small decay widths in some models may be observable.
| [
{
"created": "Wed, 6 Sep 2006 23:31:45 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Nov 2006 06:19:45 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Barger",
"Vernon",
""
],
[
"Langacker",
"Paul",
""
],
[
"Shaughnessy",
"Gabe",
""
]
] | Extending the Higgs sector of the MSSM by the addition of a gauge singlet scalar field can remedy the mu problem. We explore the implications of extended models for both the spectrum of the neutralinos and the cascade decays of the neutralinos and charginos. Extra steps due to light decoupled neutralinos in the cascade decays of both neutralinos and charginos allow an excess of trilepton events compared to the MSSM and the existence of events with higher lepton multiplicity. Additionally, displaced vertices of the chi_2^0 due to small decay widths in some models may be observable. |
1001.3554 | Andreas Vogt | A. Vogt (Liverpool Univ.), S. Moch (DESY, Zeuthen), G. Soar (Liverpool
Univ.) and J.A.M. Vermaseren (NIKHEF, Amsterdam) | Higher-order predictions for splitting functions and coefficient
functions from physical evolution kernels | 7 pages, LaTeX (PoS style). Presented by A.V. at RADCOR 2009, Ascona
(Switzerland), October 2009. Too appear in the proceedings | null | null | LTH 862, DESY 10-007 | hep-ph | http://creativecommons.org/licenses/by-nc-sa/3.0/ | We have studied the physical evolution kernels for nine non-singlet
observables in deep-inelastic scattering (DIS), semi-inclusive
e^+e^-annihilation and the Drell-Yan (DY) process, and for the flavour-singlet
case of the photon- and heavy-top Higgs-exchange structure functions (F_2,
F_phi) in DIS. All known contributions to these kernels show an only
single-logarithmic large-x enhancement at all powers of 1-x. Conjecturing that
this behaviour persists to (all) higher orders, we have predicted the highest
three (DY: two) double logarithms of the higher-order non-singlet coefficient
functions and of the four-loop singlet splitting functions. The
coefficient-function predictions canbe written as exponentiations of
1/N-suppressed contributions in Mellin-N space which, however, are less
predictive than the well-known exponentiation of the ln^k N terms.
| [
{
"created": "Wed, 20 Jan 2010 14:09:26 GMT",
"version": "v1"
}
] | 2010-01-21 | [
[
"Vogt",
"A.",
"",
"Liverpool Univ."
],
[
"Moch",
"S.",
"",
"DESY, Zeuthen"
],
[
"Soar",
"G.",
"",
"Liverpool\n Univ."
],
[
"Vermaseren",
"J. A. M.",
"",
"NIKHEF, Amsterdam"
]
] | We have studied the physical evolution kernels for nine non-singlet observables in deep-inelastic scattering (DIS), semi-inclusive e^+e^-annihilation and the Drell-Yan (DY) process, and for the flavour-singlet case of the photon- and heavy-top Higgs-exchange structure functions (F_2, F_phi) in DIS. All known contributions to these kernels show an only single-logarithmic large-x enhancement at all powers of 1-x. Conjecturing that this behaviour persists to (all) higher orders, we have predicted the highest three (DY: two) double logarithms of the higher-order non-singlet coefficient functions and of the four-loop singlet splitting functions. The coefficient-function predictions canbe written as exponentiations of 1/N-suppressed contributions in Mellin-N space which, however, are less predictive than the well-known exponentiation of the ln^k N terms. |
0903.1794 | Gilad Perez | Alexander L. Kagan, Gilad Perez, Tomer Volansky and Jure Zupan | General Minimal Flavor Violation | 5 pages and no figures | Phys.Rev.D80:076002,2009 | 10.1103/PhysRevD.80.076002 | WIS/03/09-MARCH-DPP | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A model independent study of the minimal flavor violation (MFV) framework is
presented, where the only sources of flavor breaking at low energy are the up
and down Yukawa matrices. Two limits are identified for the Yukawa coupling
expansion: linear MFV, where it is truncated at the leading terms, and
nonlinear MFV, where such a truncation is not possible due to large third
generation Yukawa couplings. These are then resummed to all orders using
non-linear sigma-model techniques familiar from models of collective breaking.
Generically, flavor diagonal CP violating (CPV) sources in the UV can induce
O(1) CPV in processes involving third generation quarks. Due to a residual U(2)
symmetry, the extra CPV in B_d-\bar B_d mixing is bounded by CPV in B_s-\bar
B_s mixing. If operators with right-handed light quarks are subdominant, the
extra CPV is equal in the two systems, and is negligible in processes involving
only the first two generations. We find large enhancements in the up type
sector, both in CPV in D-\bar D mixing and in top flavor violation.
| [
{
"created": "Tue, 10 Mar 2009 15:17:08 GMT",
"version": "v1"
}
] | 2009-10-29 | [
[
"Kagan",
"Alexander L.",
""
],
[
"Perez",
"Gilad",
""
],
[
"Volansky",
"Tomer",
""
],
[
"Zupan",
"Jure",
""
]
] | A model independent study of the minimal flavor violation (MFV) framework is presented, where the only sources of flavor breaking at low energy are the up and down Yukawa matrices. Two limits are identified for the Yukawa coupling expansion: linear MFV, where it is truncated at the leading terms, and nonlinear MFV, where such a truncation is not possible due to large third generation Yukawa couplings. These are then resummed to all orders using non-linear sigma-model techniques familiar from models of collective breaking. Generically, flavor diagonal CP violating (CPV) sources in the UV can induce O(1) CPV in processes involving third generation quarks. Due to a residual U(2) symmetry, the extra CPV in B_d-\bar B_d mixing is bounded by CPV in B_s-\bar B_s mixing. If operators with right-handed light quarks are subdominant, the extra CPV is equal in the two systems, and is negligible in processes involving only the first two generations. We find large enhancements in the up type sector, both in CPV in D-\bar D mixing and in top flavor violation. |
hep-ph/0207139 | Luis Anchordoqui | Luis A. Anchordoqui, Jonathan L. Feng, Haim Goldberg, Alfred D.
Shapere | Neutrino Bounds on Astrophysical Sources and New Physics | 18 pages, 5 figures, added new figure comparing cosmic ray and LHC
black hole rates, to be published in Phys. Rev. D | Phys.Rev.D66:103002,2002 | 10.1103/PhysRevD.66.103002 | NUB-3229-Th-02, UCI-TR-2002-22, UK/02-09 | hep-ph astro-ph hep-ex | null | Ultra-high energy cosmic neutrinos are incisive probes of both astrophysical
sources and new TeV-scale physics. Such neutrinos would create extensive air
showers deep in the atmosphere. The absence of such showers implies upper
limits on incoming neutrino fluxes and cross sections. Combining the exposures
of AGASA, the largest existing ground array, with the exposure of the Fly's Eye
fluorescence detector integrated over all its operating epochs, we derive 95%
CL bounds that substantially improve existing limits. We begin with
model-independent bounds on astrophysical fluxes, assuming standard model cross
sections, and model-independent bounds on new physics cross sections, assuming
a conservative cosmogenic flux. We then derive model-dependent constraints on
new components of neutrino flux for several assumed power spectra, and we
update bounds on the fundamental Planck scale M_D in extra dimension scenarios
from black hole production. For large numbers of extra dimensions, we find M_D
> 2.0 (1.1) TeV for \mbhmin = M_D (5 M_D), comparable to or exceeding the most
stringent constraints to date.
| [
{
"created": "Thu, 11 Jul 2002 17:38:47 GMT",
"version": "v1"
},
{
"created": "Fri, 27 Sep 2002 12:00:57 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Anchordoqui",
"Luis A.",
""
],
[
"Feng",
"Jonathan L.",
""
],
[
"Goldberg",
"Haim",
""
],
[
"Shapere",
"Alfred D.",
""
]
] | Ultra-high energy cosmic neutrinos are incisive probes of both astrophysical sources and new TeV-scale physics. Such neutrinos would create extensive air showers deep in the atmosphere. The absence of such showers implies upper limits on incoming neutrino fluxes and cross sections. Combining the exposures of AGASA, the largest existing ground array, with the exposure of the Fly's Eye fluorescence detector integrated over all its operating epochs, we derive 95% CL bounds that substantially improve existing limits. We begin with model-independent bounds on astrophysical fluxes, assuming standard model cross sections, and model-independent bounds on new physics cross sections, assuming a conservative cosmogenic flux. We then derive model-dependent constraints on new components of neutrino flux for several assumed power spectra, and we update bounds on the fundamental Planck scale M_D in extra dimension scenarios from black hole production. For large numbers of extra dimensions, we find M_D > 2.0 (1.1) TeV for \mbhmin = M_D (5 M_D), comparable to or exceeding the most stringent constraints to date. |
hep-ph/0308206 | Carlo Giunti | Carlo Giunti | Double Beta Decay and the Absolute Neutrino Mass Scale | 6 pages, Proceedings of NuFact 03, 5th International Workshop on
Neutrino Factories & Superbeams, 5-11 June 2003, Columbia University, New
York | null | 10.1063/1.1818390 | null | hep-ph astro-ph hep-ex | null | After a short review of the current status of three-neutrino mixing, the
implications for the values of neutrino masses are discussed. The bounds on the
absolute scale of neutrino masses from Tritium beta-decay and cosmological data
are reviewed. Finally, we discuss the implications of three-neutrino mixing for
neutrinoless double-beta decay.
| [
{
"created": "Wed, 20 Aug 2003 13:38:50 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Giunti",
"Carlo",
""
]
] | After a short review of the current status of three-neutrino mixing, the implications for the values of neutrino masses are discussed. The bounds on the absolute scale of neutrino masses from Tritium beta-decay and cosmological data are reviewed. Finally, we discuss the implications of three-neutrino mixing for neutrinoless double-beta decay. |
hep-ph/0401068 | Igor Marfin | I. Marfin, V. Mossolov, T. Shishkina | Contribution of the main radiative corrections to anomalous quartic
constants in process gamma-gamma-->WW | 9 pages, 7 figures, talk given at Int. School-Seminar "The actual
Problems of Microworld Physics", Gomel, 2003 | null | null | null | hep-ph | null | Evaluation of anomalous couplings in the $\gamma\gamma\to W^+W^-$ process
needs to calculate the cross section $\sigma(W^+W^-)$ with a high precision.
Therefore one has to consider the main contribution of high order effects. In
this paper contributions of anomalous quartic boson interaction given by ${\cal
L}_0$, ${\cal L}_c$, $\tilde{{\cal L}}_0$ are analyzed in high-energy region.
Influence of high order effects is studed in dependences of $\sigma(W^+W^-)$ on
anomalous constants and contour plots with statistical error $2\delta$.
| [
{
"created": "Sun, 11 Jan 2004 12:41:47 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Marfin",
"I.",
""
],
[
"Mossolov",
"V.",
""
],
[
"Shishkina",
"T.",
""
]
] | Evaluation of anomalous couplings in the $\gamma\gamma\to W^+W^-$ process needs to calculate the cross section $\sigma(W^+W^-)$ with a high precision. Therefore one has to consider the main contribution of high order effects. In this paper contributions of anomalous quartic boson interaction given by ${\cal L}_0$, ${\cal L}_c$, $\tilde{{\cal L}}_0$ are analyzed in high-energy region. Influence of high order effects is studed in dependences of $\sigma(W^+W^-)$ on anomalous constants and contour plots with statistical error $2\delta$. |
hep-ph/0002300 | Elena Gonzalez Ferreiro | A. Capella, E. G. Ferreiro and A. B. Kaidalov | Non-saturation of the J/psi suppression at large transverse energy in
the comovers approach | 12 pages, latex, 2 postscript figures | Phys.Rev.Lett. 85 (2000) 2080-2083 | 10.1103/PhysRevLett.85.2080 | LPTHE Orsay 00-21 | hep-ph | null | We show that, contrary to recent claims, the $J/\psi$ suppression resulting
from its interaction with comovers does not saturate at large transverse energy
$E_T$. On the contrary, it shows a characteristic structure - change of
curvature near the knee of the $E_T$ distribution - which is due to the $E_T$
(or multiplicity) fluctuation, and agrees with recent experimental results.
| [
{
"created": "Tue, 29 Feb 2000 15:02:48 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Capella",
"A.",
""
],
[
"Ferreiro",
"E. G.",
""
],
[
"Kaidalov",
"A. B.",
""
]
] | We show that, contrary to recent claims, the $J/\psi$ suppression resulting from its interaction with comovers does not saturate at large transverse energy $E_T$. On the contrary, it shows a characteristic structure - change of curvature near the knee of the $E_T$ distribution - which is due to the $E_T$ (or multiplicity) fluctuation, and agrees with recent experimental results. |
2401.04948 | Georgii Shestakov | N. N. Achasov and G. N. Shestakov | Toward an estimate of the amplitude $X(3872)\to\pi^0\chi_{c1}(1P)$ | 12 pages, 7 figures, v2, published version, clarifications and
references added | Phys. Rev. D 109, 036028 (2024) | null | null | hep-ph hep-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The well-known model of the triangle diagrams with $D^*\bar DD^*$ and $\bar
D^*D\bar D^*$ mesons in the loops is compared with the modern data on the
amplitude of the $X(3872)\to\pi^0\chi_{c1}(1P)$ decay. Considering the
$X(3872)$ object as a $\chi_{c1}(2P)$ charmonium state, we introduce a
parameter $\xi$ characterizing the scale of the isotopic symmetry violation in
this decay and find a lower limit of $\xi\simeq0.0916$. The model incorporates
the only fitted parameter associated with the form factor. We analyze in detail
the influence of the form factor on the amplitude $X(3872)\to\pi^0
\chi_{c1}(1P)$ and on the parameter $\xi$. As the suppression of the amplitude
by the form factor increases, $\xi$ increases. Due to the fact that the
$X(3872)$ resonance is located practically at the threshold of the $D^0\bar
D^{*0}$ channel, the amplitude of $X(3872) \to\pi^0\chi_{c1}(1P)$ turns out to
be proportional to $\sqrt{m_d -m_u}$. Using the estimating values for the
coupling constants $g_{XD\bar D^*}$, $g_{\chi_{ c1}D\bar D^*}$, and
$g_{D^{*0}D^{*0}\pi^0}$, we show that the model of the triangle loop diagrams
is in reasonable agreement with the available data. Apart from the difference
in the masses of neutral and charged charmed mesons, any additional exotic
sources of isospin violation in $X(3872)\to\pi^0\chi_{c1}(1P)$ (such as a
significant difference between the coupling constants $g_{XD^0\bar D^{*0}}$ and
$g_{XD^+ D^{*-}}$) are not required to interpret the data. This indirectly
confirms the isotopic neutrality of the $X(3872)$, which is naturally realized
for the $c\bar c$ state $\chi_{c1}(2P)$.
| [
{
"created": "Wed, 10 Jan 2024 06:06:43 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Feb 2024 04:13:14 GMT",
"version": "v2"
}
] | 2024-02-28 | [
[
"Achasov",
"N. N.",
""
],
[
"Shestakov",
"G. N.",
""
]
] | The well-known model of the triangle diagrams with $D^*\bar DD^*$ and $\bar D^*D\bar D^*$ mesons in the loops is compared with the modern data on the amplitude of the $X(3872)\to\pi^0\chi_{c1}(1P)$ decay. Considering the $X(3872)$ object as a $\chi_{c1}(2P)$ charmonium state, we introduce a parameter $\xi$ characterizing the scale of the isotopic symmetry violation in this decay and find a lower limit of $\xi\simeq0.0916$. The model incorporates the only fitted parameter associated with the form factor. We analyze in detail the influence of the form factor on the amplitude $X(3872)\to\pi^0 \chi_{c1}(1P)$ and on the parameter $\xi$. As the suppression of the amplitude by the form factor increases, $\xi$ increases. Due to the fact that the $X(3872)$ resonance is located practically at the threshold of the $D^0\bar D^{*0}$ channel, the amplitude of $X(3872) \to\pi^0\chi_{c1}(1P)$ turns out to be proportional to $\sqrt{m_d -m_u}$. Using the estimating values for the coupling constants $g_{XD\bar D^*}$, $g_{\chi_{ c1}D\bar D^*}$, and $g_{D^{*0}D^{*0}\pi^0}$, we show that the model of the triangle loop diagrams is in reasonable agreement with the available data. Apart from the difference in the masses of neutral and charged charmed mesons, any additional exotic sources of isospin violation in $X(3872)\to\pi^0\chi_{c1}(1P)$ (such as a significant difference between the coupling constants $g_{XD^0\bar D^{*0}}$ and $g_{XD^+ D^{*-}}$) are not required to interpret the data. This indirectly confirms the isotopic neutrality of the $X(3872)$, which is naturally realized for the $c\bar c$ state $\chi_{c1}(2P)$. |
2109.07597 | Yunhua Ding | Yunhua Ding, Teague D. Olewiler, and Mohammad Farhan Rawnak | Penning-Trap Searches for Lorentz and CPT Violation | 20 pages, accepted for publication in Symmetry | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An overview of recent progress on testing Lorentz and CPT symmetry using
Penning traps is presented. The theory of quantum electrodynamics with
Lorentz-violating operators of mass dimensions up to six is summarized.
Dominant shifts in the cyclotron and anomaly frequencies of the confined
particles and antiparticles due to Lorentz and CPT violation are derived.
Existing results of the comparisons of charge-to-mass ratios and magnetic
moments involving protons, antiprotons, electrons, and positrons are used to
constrain various coefficients for Lorentz violation.
| [
{
"created": "Wed, 15 Sep 2021 22:17:07 GMT",
"version": "v1"
}
] | 2021-09-17 | [
[
"Ding",
"Yunhua",
""
],
[
"Olewiler",
"Teague D.",
""
],
[
"Rawnak",
"Mohammad Farhan",
""
]
] | An overview of recent progress on testing Lorentz and CPT symmetry using Penning traps is presented. The theory of quantum electrodynamics with Lorentz-violating operators of mass dimensions up to six is summarized. Dominant shifts in the cyclotron and anomaly frequencies of the confined particles and antiparticles due to Lorentz and CPT violation are derived. Existing results of the comparisons of charge-to-mass ratios and magnetic moments involving protons, antiprotons, electrons, and positrons are used to constrain various coefficients for Lorentz violation. |
hep-ph/9805387 | Carlo Giunti | S.M. Bilenky, C. Giunti, W. Grimus | Four-neutrino mixing and long-baseline neutrino oscillation experiments | 5 pages, including 2 figures. Talk presented by C. Giunti at the
XXXIIInd Rencontres de Moriond: Electroweak Interactions and Unified
Theories, Les Arcs 1800 (France), March 14-21 1998 | null | null | DFTT 24/98, UWThPh-1998-23 | hep-ph | null | We consider the two schemes with four massive neutrinos which are compatible
with the results of all neutrino oscillation experiments. We show that in these
two schemes the probabilities of nu_e disappearance and nu_mu->nu_e appearance
in long-baseline experiments are strongly suppressed.
| [
{
"created": "Wed, 20 May 1998 09:37:35 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Bilenky",
"S. M.",
""
],
[
"Giunti",
"C.",
""
],
[
"Grimus",
"W.",
""
]
] | We consider the two schemes with four massive neutrinos which are compatible with the results of all neutrino oscillation experiments. We show that in these two schemes the probabilities of nu_e disappearance and nu_mu->nu_e appearance in long-baseline experiments are strongly suppressed. |
hep-ph/0702281 | R. Sekhar Chivukula | R. Sekhar Chivukula, Neil D. Christensen, Baradhwaj Coleppa, and
Elizabeth H. Simmons | Unitarity and Bounds on the Scale of Fermion Mass Generation | 12 pages, 11 eps figures included, revtex. Refrences added; wording
modified slightly to emphasize focus on top-quark | Phys.Rev.D75:073018,2007 | 10.1103/PhysRevD.75.073018 | MSUHEP-070227 | hep-ph hep-lat hep-th | null | The scale of fermion mass generation can, as shown by Appelquist and
Chanowitz, be bounded from above by relating it to the scale of unitarity
violation in the helicity nonconserving amplitude for fermion-anti-fermion
pairs to scatter into pairs of longitudinally polarized electroweak gauge
bosons. In this paper, we examine the process t tbar -> W_L W_L in a family of
phenomenologically-viable deconstructed Higgsless models and we show that scale
of unitarity violation depends on the mass of the additional vector-like
fermion states that occur in these theories (the states that are the
deconstructed analogs of Kaluza-Klein partners of the ordinary fermions in a
five-dimensional theory). For sufficiently light vector fermions, and for a
deconstructed theory with sufficiently many lattice sites (that is,
sufficiently close to the continuum limit), the Appelquist-Chanowitz bound can
be substantially weakened. More precisely, we find that, as one varies the mass
of the vector-like fermion for fixed top-quark and gauge-boson masses, the
bound on the scale of top-quark mass generation interpolates smoothly between
the Appelquist-Chanowitz bound and one that can, potentially, be much higher.
In these theories, therefore, the bound on the scale of fermion mass generation
is independent of the bound on the scale of gauge-boson mass generation. While
our analysis focuses on deconstructed Higgsless models, any theory in which
top-quark mass generation proceeds via the mixing of chiral and vector fermions
will give similar results.
| [
{
"created": "Tue, 27 Feb 2007 18:50:15 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Mar 2007 17:55:28 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Chivukula",
"R. Sekhar",
""
],
[
"Christensen",
"Neil D.",
""
],
[
"Coleppa",
"Baradhwaj",
""
],
[
"Simmons",
"Elizabeth H.",
""
]
] | The scale of fermion mass generation can, as shown by Appelquist and Chanowitz, be bounded from above by relating it to the scale of unitarity violation in the helicity nonconserving amplitude for fermion-anti-fermion pairs to scatter into pairs of longitudinally polarized electroweak gauge bosons. In this paper, we examine the process t tbar -> W_L W_L in a family of phenomenologically-viable deconstructed Higgsless models and we show that scale of unitarity violation depends on the mass of the additional vector-like fermion states that occur in these theories (the states that are the deconstructed analogs of Kaluza-Klein partners of the ordinary fermions in a five-dimensional theory). For sufficiently light vector fermions, and for a deconstructed theory with sufficiently many lattice sites (that is, sufficiently close to the continuum limit), the Appelquist-Chanowitz bound can be substantially weakened. More precisely, we find that, as one varies the mass of the vector-like fermion for fixed top-quark and gauge-boson masses, the bound on the scale of top-quark mass generation interpolates smoothly between the Appelquist-Chanowitz bound and one that can, potentially, be much higher. In these theories, therefore, the bound on the scale of fermion mass generation is independent of the bound on the scale of gauge-boson mass generation. While our analysis focuses on deconstructed Higgsless models, any theory in which top-quark mass generation proceeds via the mixing of chiral and vector fermions will give similar results. |
2105.05665 | Fayyazuddin Fayyazuddin | Fayyazuddin | W-exchange contributions in hadronic decays of bottom baryon
$\Lambda_{b}$ | null | null | null | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | The nonleptonic decays
$\Lambda_{b}\rightarrow\Sigma_{c}^{*-}\pi^{+},\Xi_{c}^{*0}K^{0}$ and
$\Lambda_{b}\rightarrow\Delta^{0}D^{0},\Sigma^{*-}D_{0}^{+}$ are studied. In
addition, the decays
$\Lambda_{b}\rightarrow\Xi_{c}^{0}K^{0},\Sigma^{-}D_{s}^{+}$ are analyzed. For
all these decays the dominant contribution comes from $W-$exchange, and for the
decay $\Lambda_{b}\rightarrow\Lambda_{c}^{+}\pi^{-}$, in addition to
factorization, baryon pole contribution to the $p$-wave (parity conserving)
decay amplitude $B$ is discussed.
| [
{
"created": "Wed, 12 May 2021 13:55:40 GMT",
"version": "v1"
}
] | 2021-05-13 | [
[
"Fayyazuddin",
"",
""
]
] | The nonleptonic decays $\Lambda_{b}\rightarrow\Sigma_{c}^{*-}\pi^{+},\Xi_{c}^{*0}K^{0}$ and $\Lambda_{b}\rightarrow\Delta^{0}D^{0},\Sigma^{*-}D_{0}^{+}$ are studied. In addition, the decays $\Lambda_{b}\rightarrow\Xi_{c}^{0}K^{0},\Sigma^{-}D_{s}^{+}$ are analyzed. For all these decays the dominant contribution comes from $W-$exchange, and for the decay $\Lambda_{b}\rightarrow\Lambda_{c}^{+}\pi^{-}$, in addition to factorization, baryon pole contribution to the $p$-wave (parity conserving) decay amplitude $B$ is discussed. |
1303.3521 | Chunhui Chen | Chunhui Chen | Identifying boosted hadronically decaying top quark using jet
substructure in its center-of-mass frame | 6 pages, 6 figures. Published in Phys. Rev. D 87, 074007 (2013).
arXiv admin note: text overlap with arXiv:1112.2567 | Phys. Rev. D 87, 074007 (2013) | 10.1103/PhysRevD.87.074007 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we study the identification of boosted hadronically decaying
top quarks using jet substructure in the center-of-mass frame of the jet. We
demonstrate that the method can greatly reduce the QCD jet background while
maintaining high identification efficiency of the boosted top quark even in a
very high pileup condition. Applications to searches for heavy resonances that
decay to a $t\bar{t}$ final state are also discussed.
| [
{
"created": "Thu, 14 Mar 2013 17:35:46 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Apr 2013 18:31:41 GMT",
"version": "v2"
}
] | 2013-04-11 | [
[
"Chen",
"Chunhui",
""
]
] | In this paper we study the identification of boosted hadronically decaying top quarks using jet substructure in the center-of-mass frame of the jet. We demonstrate that the method can greatly reduce the QCD jet background while maintaining high identification efficiency of the boosted top quark even in a very high pileup condition. Applications to searches for heavy resonances that decay to a $t\bar{t}$ final state are also discussed. |
2209.01222 | Jernej Kamenik | Darius A. Faroughy, Jernej F. Kamenik, Manuel Szewc and Jure Zupan | Accessing CKM suppressed top decays at the LHC | 19 pages, 7 figures | SciPost Phys. 16, 131 (2024) | 10.21468/SciPostPhys.16.5.131 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose an extension of the existing experimental strategy for measuring
branching fractions of top quark decays, targeting specifically $t\to j_q W$,
where $j_q$ is a light quark jet. The improved strategy uses orthogonal $b$-
and $q$-taggers, and adds a new observable, the number of light-quark-tagged
jets, to the already commonly used observable, the fraction of $b$-tagged jets
in an event. Careful inclusion of the additional complementary observable
significantly increases the expected statistical power of the analysis, with
the possibility of excluding $|V_{tb}|=1$ at $95\%$ C.L. at the HL-LHC, and
accessing directly the standard model value of $|V_{td}|^2+|V_{ts}|^2$.
| [
{
"created": "Fri, 2 Sep 2022 18:00:02 GMT",
"version": "v1"
}
] | 2024-05-29 | [
[
"Faroughy",
"Darius A.",
""
],
[
"Kamenik",
"Jernej F.",
""
],
[
"Szewc",
"Manuel",
""
],
[
"Zupan",
"Jure",
""
]
] | We propose an extension of the existing experimental strategy for measuring branching fractions of top quark decays, targeting specifically $t\to j_q W$, where $j_q$ is a light quark jet. The improved strategy uses orthogonal $b$- and $q$-taggers, and adds a new observable, the number of light-quark-tagged jets, to the already commonly used observable, the fraction of $b$-tagged jets in an event. Careful inclusion of the additional complementary observable significantly increases the expected statistical power of the analysis, with the possibility of excluding $|V_{tb}|=1$ at $95\%$ C.L. at the HL-LHC, and accessing directly the standard model value of $|V_{td}|^2+|V_{ts}|^2$. |
1804.07241 | Madhurima Pandey | Madhurima Pandey | Unparticle Decay of Neutrinos and its Possible Signatures at a ${\rm
Km}^2$ Detector for (3+1) Flavour Framework | 20 pages LaTeX, 5 eps figures | null | 10.1007/JHEP01(2019)066 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a scenario where ultra high energy neutrinos undergo unparticle
decay during its passage from its cosmological source to Earth. The idea of
unparticle had been first proposed by Georgi by considering the possible
existence of an unknown scale invariant sector at high energies and the
unparticles in this sector manifest itself below a dimensional transmutation
scale $\Lambda_{\cal U}$. We then explore the possible signature of such
decaying neutrinos to unparticles at a square kilometer detector such as
IceCube.
| [
{
"created": "Thu, 19 Apr 2018 15:48:29 GMT",
"version": "v1"
}
] | 2019-01-30 | [
[
"Pandey",
"Madhurima",
""
]
] | We consider a scenario where ultra high energy neutrinos undergo unparticle decay during its passage from its cosmological source to Earth. The idea of unparticle had been first proposed by Georgi by considering the possible existence of an unknown scale invariant sector at high energies and the unparticles in this sector manifest itself below a dimensional transmutation scale $\Lambda_{\cal U}$. We then explore the possible signature of such decaying neutrinos to unparticles at a square kilometer detector such as IceCube. |
1907.01472 | Samoil Bilenky M. | S. Bilenky | Neutrino Masses from the Point of View of Economy and Simplicity | null | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the framework of such basic principles as local gauge invariance,
unification of the weak and electromagnetic interactions and spontaneous
symmetry breaking in the Standard Model the most economical and simplest
possibilities are realized. We discuss the problem of neutrino masses from the
point of view of economy and simplicity. It is unlikely that neutrino masses
are of the same SM origin as masses of leptons and quarks. The Weinberg
effective Lagrangian is the simplest and the most economical, beyond the
Standard Model mechanism of the generation of small Majorana neutrino masses.
The resolution of the sterile neutrino anomaly and observation of the
neutrinoless double $\beta$-decay would be crucial tests of this mechanism.
| [
{
"created": "Tue, 2 Jul 2019 16:02:35 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Jul 2019 04:58:41 GMT",
"version": "v2"
}
] | 2019-07-10 | [
[
"Bilenky",
"S.",
""
]
] | In the framework of such basic principles as local gauge invariance, unification of the weak and electromagnetic interactions and spontaneous symmetry breaking in the Standard Model the most economical and simplest possibilities are realized. We discuss the problem of neutrino masses from the point of view of economy and simplicity. It is unlikely that neutrino masses are of the same SM origin as masses of leptons and quarks. The Weinberg effective Lagrangian is the simplest and the most economical, beyond the Standard Model mechanism of the generation of small Majorana neutrino masses. The resolution of the sterile neutrino anomaly and observation of the neutrinoless double $\beta$-decay would be crucial tests of this mechanism. |
2304.04924 | Igor Strakovsky | Igor Strakovsky (GWU), William J. Briscoe (GWU), Eugene Chudakov
(JLab), Ilya Larin (UMASS Amherst), Lubomir Pentchev (JLab), Axel Schmidt
(GWU), and Ronald L. Workman (GWU) | Is the LHCb $P_c(4312)^+$ plausible in the GlueX $\gamma p\to J/\psi p$
total cross sections ? | 4 pages, 3 figures, 2 tables | null | null | null | hep-ph hep-ex nucl-ex nucl-th | http://creativecommons.org/licenses/by/4.0/ | New high-statistics total cross section data for $\gamma p\to J/\psi p$ from
the GLUonic EXcitation (GlueX) experiment are fitted in a search for the exotic
$P_c(4312)^+$ state observed by the Large Hadron Collider beauty (LHCb)
collaboration. The integrated luminosity of this GlueX experiment was about
$320~\mathrm{pb^{-1}}$. The fits show that destructive interference involving
an $S$-wave resonance and associated non-resonance background produces a sharp
dip structure about $75~\mathrm{MeV}$ below the LHCb mass, in the same location
as a similar structure is seen in the data. Limitations of the employed model
and the need for improved statistics are discussed.
| [
{
"created": "Tue, 11 Apr 2023 01:30:39 GMT",
"version": "v1"
}
] | 2023-04-12 | [
[
"Strakovsky",
"Igor",
"",
"GWU"
],
[
"Briscoe",
"William J.",
"",
"GWU"
],
[
"Chudakov",
"Eugene",
"",
"JLab"
],
[
"Larin",
"Ilya",
"",
"UMASS Amherst"
],
[
"Pentchev",
"Lubomir",
"",
"JLab"
],
[
"Schmidt",
... | New high-statistics total cross section data for $\gamma p\to J/\psi p$ from the GLUonic EXcitation (GlueX) experiment are fitted in a search for the exotic $P_c(4312)^+$ state observed by the Large Hadron Collider beauty (LHCb) collaboration. The integrated luminosity of this GlueX experiment was about $320~\mathrm{pb^{-1}}$. The fits show that destructive interference involving an $S$-wave resonance and associated non-resonance background produces a sharp dip structure about $75~\mathrm{MeV}$ below the LHCb mass, in the same location as a similar structure is seen in the data. Limitations of the employed model and the need for improved statistics are discussed. |
1805.06482 | Maxim Bezuglov | M.A. Bezuglov and A.I. Onishchenko | Two-loop corrections to false vacuum decay in scalar field theory | 20 pages, 3 figures, clarifications added | Physics Letters B Volume 788, 10 January 2019, Pages 122-130 | 10.1016/j.physletb.2018.11.005 | null | hep-ph hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider radiative corrections to false vacuum decay in a four-dimensional
scalar field theory with cubic and quartic potential. Using planar thin wall
approximation we were able to get analytical expression for the decay rate up
to two loop order. The results obtained employ dimensional regularization and
$\overline{MS}$ renormalization scheme.
| [
{
"created": "Wed, 16 May 2018 18:32:35 GMT",
"version": "v1"
},
{
"created": "Tue, 29 May 2018 15:04:07 GMT",
"version": "v2"
},
{
"created": "Sat, 24 Nov 2018 13:42:19 GMT",
"version": "v3"
}
] | 2019-03-28 | [
[
"Bezuglov",
"M. A.",
""
],
[
"Onishchenko",
"A. I.",
""
]
] | We consider radiative corrections to false vacuum decay in a four-dimensional scalar field theory with cubic and quartic potential. Using planar thin wall approximation we were able to get analytical expression for the decay rate up to two loop order. The results obtained employ dimensional regularization and $\overline{MS}$ renormalization scheme. |
hep-ph/0006099 | null | N. Okamura (Theory Group, KEK), M. Tanimoto (Niigata Univ.) | Generic Relations of Flavor Mixings between Leptons and Quarks in SU(5) | 16 pages, 2 figures, Some discussions are modified, but results are
not changed | Prog.Theor.Phys. 105 (2001) 459-469 | 10.1143/PTP.105.459 | KEK-TH-700, NIIG-DP-00-04 | hep-ph | null | We have studied implications of the generic lopsided mass matrix of the
charged leptons by taking the SU(5) GUT relation in the nearest-neighbor
interaction (NNI) basis. We have found four interesting relations among the
lepton mixings and the quark ones, which are independent of details of the
model. These relations are discussed by using the experimental data. We have
also discussed the relation between U_{e2} and U_{e3} incuding the contribution
from the neutrino mass matrix. We have presented the probable value U_{e3}=0.05
\sim 0.16, which is independent of the solar neutrino solutions. The CP
violating quantity J_{CP} is also discussed.
| [
{
"created": "Sat, 10 Jun 2000 07:29:03 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Oct 2000 05:48:09 GMT",
"version": "v2"
},
{
"created": "Sat, 23 Dec 2000 06:33:25 GMT",
"version": "v3"
}
] | 2009-10-31 | [
[
"Okamura",
"N.",
"",
"Theory Group, KEK"
],
[
"Tanimoto",
"M.",
"",
"Niigata Univ."
]
] | We have studied implications of the generic lopsided mass matrix of the charged leptons by taking the SU(5) GUT relation in the nearest-neighbor interaction (NNI) basis. We have found four interesting relations among the lepton mixings and the quark ones, which are independent of details of the model. These relations are discussed by using the experimental data. We have also discussed the relation between U_{e2} and U_{e3} incuding the contribution from the neutrino mass matrix. We have presented the probable value U_{e3}=0.05 \sim 0.16, which is independent of the solar neutrino solutions. The CP violating quantity J_{CP} is also discussed. |
hep-ph/9309264 | Papadopoulos | N.G.Antoniou, F.K.Diakonos, I.S.Mistakidis and C.G.Papadopoulos | Criticality, Fractality and Intermittency in Strong Interactions | 15 pages + 2 figures (available on request), CERN-TH.6990/93,
UA/NPPS-5-93 | Phys.Rev. D49 (1994) 5789-5797 | 10.1103/PhysRevD.49.5789 | null | hep-ph | null | Assuming a second-order phase transition for the hadronization process, we
attempt to associate intermittency patterns in high-energy hadronic collisions
to fractal structures in configuration space and corresponding intermittency
indices to the isothermal critical exponent at the transition temperature. In
this approach, the most general multidimensional intermittency pattern,
associated to a second-order phase transition of the strongly interacting
system, is determined, and its relevance to present and future experiments is
discussed.
| [
{
"created": "Wed, 15 Sep 1993 10:38:56 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Antoniou",
"N. G.",
""
],
[
"Diakonos",
"F. K.",
""
],
[
"Mistakidis",
"I. S.",
""
],
[
"Papadopoulos",
"C. G.",
""
]
] | Assuming a second-order phase transition for the hadronization process, we attempt to associate intermittency patterns in high-energy hadronic collisions to fractal structures in configuration space and corresponding intermittency indices to the isothermal critical exponent at the transition temperature. In this approach, the most general multidimensional intermittency pattern, associated to a second-order phase transition of the strongly interacting system, is determined, and its relevance to present and future experiments is discussed. |
hep-ph/9706418 | Christoph Hofmann | Christoph P. Hofmann | Effective Analysis of the O(N) Antiferromagnet: Low Temperature
Expansion of the Order Parameter | Published version | Phys.Rev. B60 (1999) 406 | 10.1103/PhysRevB.60.406 | BUTP-97/15 | hep-ph cond-mat | null | We investigate the low energy properties of Lorentz-invariant theories with a
spontaneously broken rotation symmetry O(N) $\to$ O(N--1). The leading
coefficients of the low temperature expansion for the partition function are
calculated up to and including three loops. Emphasis is put into the special
case N=3: it describes the antiferromagnet which has been extensively studied.
Our results obtained within the framework of the effective Lagrangian technique
are compared with the literature. In particular, we show that, at order $T^7$
for the heat capacity and $T^6$ for the order parameter, respectively,
logarithmic terms appear in the low temperature expansion, which have been
overlooked so far.
| [
{
"created": "Thu, 19 Jun 1997 15:48:20 GMT",
"version": "v1"
},
{
"created": "Tue, 26 May 1998 21:17:00 GMT",
"version": "v2"
},
{
"created": "Sun, 19 Nov 2000 00:11:22 GMT",
"version": "v3"
}
] | 2009-10-30 | [
[
"Hofmann",
"Christoph P.",
""
]
] | We investigate the low energy properties of Lorentz-invariant theories with a spontaneously broken rotation symmetry O(N) $\to$ O(N--1). The leading coefficients of the low temperature expansion for the partition function are calculated up to and including three loops. Emphasis is put into the special case N=3: it describes the antiferromagnet which has been extensively studied. Our results obtained within the framework of the effective Lagrangian technique are compared with the literature. In particular, we show that, at order $T^7$ for the heat capacity and $T^6$ for the order parameter, respectively, logarithmic terms appear in the low temperature expansion, which have been overlooked so far. |
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