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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
hep-ph/0411210 | David Greynat | David Greynat (CPT) | On the rare $K \to \pi \bar l l$ decays | Talk given at the $11^{th}$ High-Energy Physics International
Conference on Quantum Chromodynamics, 5-10 July (2004), Montpellier (France) | null | null | null | hep-ph | null | In this talk, we present our recent work on the $K\ra\pi \bar{l} l$ decays in
a combined framework of chiral perturbation theory and Large--$N_c$ QCD under
the dominance of a minimal narrow resonance structure. The proposed description
reproduces very well the experimental Br$(K^+\ra\pi^+ e^+ e^-)$ and
Br$(K_S\ra\pi^0 e^+ e^-)$. Predictions for the $K\ra\pi \mu^{+}\mu^{-}$ modes
are also obtained and we can conclude to the constructive type for the
interference between the {\it direct} and {\it indirect} CP--violation
amplitudes in $K_L\ra\pi^0 e^+ e^-$.
| [
{
"created": "Tue, 16 Nov 2004 15:21:52 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Greynat",
"David",
"",
"CPT"
]
] | In this talk, we present our recent work on the $K\ra\pi \bar{l} l$ decays in a combined framework of chiral perturbation theory and Large--$N_c$ QCD under the dominance of a minimal narrow resonance structure. The proposed description reproduces very well the experimental Br$(K^+\ra\pi^+ e^+ e^-)$ and Br$(K_S\ra\pi^0 e^+ e^-)$. Predictions for the $K\ra\pi \mu^{+}\mu^{-}$ modes are also obtained and we can conclude to the constructive type for the interference between the {\it direct} and {\it indirect} CP--violation amplitudes in $K_L\ra\pi^0 e^+ e^-$. |
0710.2118 | Mu-Chun Chen | Mu-Chun Chen, K.T. Mahanthappa | Tri-bimaximal Neutrino Mixing and CKM Matrix in a SU(5)x(d)T Model | Submitted for the SUSY07 proceedings, 4 pages, LaTeX | Karlsruhe 2007, SUSY 2007, 792-795 | 10.1088/1742-6596/136/4/042021 | COLO-HEP-531, UCI-TR-2007-44 | hep-ph | null | In this talk, we present a model based on SU(5)x(d)T which successfully gives
rise to near tri-bimaximal leptonic mixing as well as realistic CKM matrix
elements for the quarks. The Georgi-Jarlskog relations for three generations
are also obtained. Due to the (d)T transformation property of the matter
fields, the b-quark mass can be generated only when the (d)T symmetry is
broken, giving a dynamical origin for the hierarchy between m_b and m_t. There
are only nine operators allowed in the Yukawa sector up to at least mass
dimension seven due to an additional Z12 x Z12' symmetry, which also forbids,
up to some high orders, operators that lead to proton decay. The resulting
model has a total of nine parameters in the charged fermion and neutrino
sectors, and hence is very predictive. In addition to the prediction for
theta13 ~ theta_c/3sqrt{2}, the model gives rise to a sum rule,
tan^2(theta_{solar}) ~ tan^2(theta_{solar,TBM}) - 1/2*theta_c*cos(beta), which
is a consequence of the Georgi-Jarlskog relations in the quark sector. This
deviation could account for the difference between the experimental best fit
value for the solar mixing angle and the value predicted by the tri-bimaximal
mixing matrix.
| [
{
"created": "Thu, 11 Oct 2007 01:42:09 GMT",
"version": "v1"
}
] | 2009-11-13 | [
[
"Chen",
"Mu-Chun",
""
],
[
"Mahanthappa",
"K. T.",
""
]
] | In this talk, we present a model based on SU(5)x(d)T which successfully gives rise to near tri-bimaximal leptonic mixing as well as realistic CKM matrix elements for the quarks. The Georgi-Jarlskog relations for three generations are also obtained. Due to the (d)T transformation property of the matter fields, the b-quark mass can be generated only when the (d)T symmetry is broken, giving a dynamical origin for the hierarchy between m_b and m_t. There are only nine operators allowed in the Yukawa sector up to at least mass dimension seven due to an additional Z12 x Z12' symmetry, which also forbids, up to some high orders, operators that lead to proton decay. The resulting model has a total of nine parameters in the charged fermion and neutrino sectors, and hence is very predictive. In addition to the prediction for theta13 ~ theta_c/3sqrt{2}, the model gives rise to a sum rule, tan^2(theta_{solar}) ~ tan^2(theta_{solar,TBM}) - 1/2*theta_c*cos(beta), which is a consequence of the Georgi-Jarlskog relations in the quark sector. This deviation could account for the difference between the experimental best fit value for the solar mixing angle and the value predicted by the tri-bimaximal mixing matrix. |
1810.01884 | Sacha Davidson | Sacha Davidson, Yoshitaka Kuno and Masato Yamanaka | Selecting mu -> e Conversion Targets to distinguish Lepton
Flavour-Changing Operators | 13 pages, 3 figures, section added, version accepted for publication | null | 10.1016/j.physletb.2019.01.042 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The experimental sensitivity to $\mu \to e$ conversion on nuclei is set to
improve by four orders of magnitude in coming years. However, various operator
coefficients add coherently in the amplitude for $\mu \to e$ conversion,
weighted by nucleus-dependent functions, and therefore in the event of a
detection, identifying the relevant new physics scenarios could be difficult.
Using a representation of the nuclear targets as vectors in coefficient space,
whose components are the weighting functions, we quantify the expectation that
different nuclear targets could give different constraints.We show that all but
two combinations of the 10 Spin-Independent (SI) coefficients could be
constrained by future measurements, but discriminating among the axial, tensor
and pseudoscalar operators that contribute to the Spin-Dependent (SD) process
would require dedicated nuclear calculations. We anticipate that $\mu \to e$
conversion could constrain 10 to 14 combinations of coefficients; if $\mu \to e
\gamma$ and $\mu \to 3e$ constrain eight more, that leaves 60 to 64 "flat
directions" in the basis of QED$\times$QCD-invariant operators which describe
$\mu \to e$ flavour change below $m_W$.
| [
{
"created": "Wed, 3 Oct 2018 18:00:02 GMT",
"version": "v1"
},
{
"created": "Sun, 20 Jan 2019 13:43:08 GMT",
"version": "v2"
}
] | 2019-01-30 | [
[
"Davidson",
"Sacha",
""
],
[
"Kuno",
"Yoshitaka",
""
],
[
"Yamanaka",
"Masato",
""
]
] | The experimental sensitivity to $\mu \to e$ conversion on nuclei is set to improve by four orders of magnitude in coming years. However, various operator coefficients add coherently in the amplitude for $\mu \to e$ conversion, weighted by nucleus-dependent functions, and therefore in the event of a detection, identifying the relevant new physics scenarios could be difficult. Using a representation of the nuclear targets as vectors in coefficient space, whose components are the weighting functions, we quantify the expectation that different nuclear targets could give different constraints.We show that all but two combinations of the 10 Spin-Independent (SI) coefficients could be constrained by future measurements, but discriminating among the axial, tensor and pseudoscalar operators that contribute to the Spin-Dependent (SD) process would require dedicated nuclear calculations. We anticipate that $\mu \to e$ conversion could constrain 10 to 14 combinations of coefficients; if $\mu \to e \gamma$ and $\mu \to 3e$ constrain eight more, that leaves 60 to 64 "flat directions" in the basis of QED$\times$QCD-invariant operators which describe $\mu \to e$ flavour change below $m_W$. |
1008.3684 | Wei-jie Fu | Wei-jie Fu and Yue-liang Wu | Fluctuations and Correlations of Conserved Charges near the QCD Critical
Point | 22 pages, 12 figures, version accepted by Phys. Rev. D | Phys.Rev.D82:074013,2010 | 10.1103/PhysRevD.82.074013 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the fluctuations and correlations of conserved charges, i.e. the
baryon number, electric charge and the strangeness at finite temperature and
nonzero baryon chemical potential with an effective model. The fluctuations are
calculated up to the fourth-order and the correlations to the third-order. We
find that the second-order fluctuations and correlations have a peak or valley
structure when the chiral phase transition takes place with the increase of the
baryon chemical potential; the third-order fluctuations and correlations change
their signs during the chiral phase transition and the fourth-order
fluctuations have two maximum and one minimum. we also depict contour plots of
various fluctuations and correlations of conserved charges in the plane of
temperature and baryon chemical potential. We find that higher order
fluctuations and correlations of conserved charges are superior to the
second-order ones to be used to search for the critical point in heavy ion
collision experiments.
| [
{
"created": "Sun, 22 Aug 2010 08:45:53 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Oct 2010 14:30:05 GMT",
"version": "v2"
}
] | 2010-10-27 | [
[
"Fu",
"Wei-jie",
""
],
[
"Wu",
"Yue-liang",
""
]
] | We study the fluctuations and correlations of conserved charges, i.e. the baryon number, electric charge and the strangeness at finite temperature and nonzero baryon chemical potential with an effective model. The fluctuations are calculated up to the fourth-order and the correlations to the third-order. We find that the second-order fluctuations and correlations have a peak or valley structure when the chiral phase transition takes place with the increase of the baryon chemical potential; the third-order fluctuations and correlations change their signs during the chiral phase transition and the fourth-order fluctuations have two maximum and one minimum. we also depict contour plots of various fluctuations and correlations of conserved charges in the plane of temperature and baryon chemical potential. We find that higher order fluctuations and correlations of conserved charges are superior to the second-order ones to be used to search for the critical point in heavy ion collision experiments. |
hep-ph/0204343 | Peter Arnold | Peter Arnold, Guy D. Moore and Laurence G. Yaffe | Photon and Gluon Emission in Relativistic Plasmas | 29 pages, 18 figures. Corrected from version 1: missing factor of 1/k
in final results and factor of 2 error on gg <-> g contribution to gluon
production. (Also changed definition of N_s by a factor of 2.) | JHEP 0206:030,2002 | 10.1088/1126-6708/2002/06/030 | null | hep-ph nucl-th | null | We recently derived, using diagrammatic methods, the leading-order hard
photon emission rate in ultra-relativistic plasmas. This requires a correct
treatment of multiple scattering effects which limit the coherence length of
emitted radiation (the Landau-Pomeranchuk-Migdal effect). In this paper, we
provide a more physical derivation of this result, and extend the treatment to
the case of gluon radiation.
| [
{
"created": "Mon, 29 Apr 2002 19:34:39 GMT",
"version": "v1"
},
{
"created": "Tue, 21 May 2002 20:59:47 GMT",
"version": "v2"
}
] | 2010-02-16 | [
[
"Arnold",
"Peter",
""
],
[
"Moore",
"Guy D.",
""
],
[
"Yaffe",
"Laurence G.",
""
]
] | We recently derived, using diagrammatic methods, the leading-order hard photon emission rate in ultra-relativistic plasmas. This requires a correct treatment of multiple scattering effects which limit the coherence length of emitted radiation (the Landau-Pomeranchuk-Migdal effect). In this paper, we provide a more physical derivation of this result, and extend the treatment to the case of gluon radiation. |
1512.08941 | Jose Rodriguez-Quintero | C. Mezrag, H. Moutarde, J. Rodr\'iguez-Quintero | Pion's valence-quark GPD and its extension beyond DGLAP region | 6 pages, 4 figures, contribution to 21st International conference on
Few-Body Problems | null | 10.1051/epjconf/201611305008 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We briefly report on a recent computation, with the help of a fruitful
algebraic model, sketching the pion valence dressed-quark generalized parton
distribution and, very preliminary, discuss on a possible avenue to get
reliable results in both Dokshitzer-Gribov-Lipatov-Altarelli-Parisi (DGLAP) and
Efremov-Radyushkin-Brodsky-Lepage (ERBL) kinematial regions.
| [
{
"created": "Wed, 30 Dec 2015 13:34:23 GMT",
"version": "v1"
}
] | 2016-04-20 | [
[
"Mezrag",
"C.",
""
],
[
"Moutarde",
"H.",
""
],
[
"Rodríguez-Quintero",
"J.",
""
]
] | We briefly report on a recent computation, with the help of a fruitful algebraic model, sketching the pion valence dressed-quark generalized parton distribution and, very preliminary, discuss on a possible avenue to get reliable results in both Dokshitzer-Gribov-Lipatov-Altarelli-Parisi (DGLAP) and Efremov-Radyushkin-Brodsky-Lepage (ERBL) kinematial regions. |
hep-ph/0108176 | Gilad Perez | Oleg Khasanov and Gilad Perez | On Neutrino Masses and a Low Breaking Scale of Left-Right Symmetry | 18 pages references added published version | Phys.Rev. D65 (2002) 053007 | 10.1103/PhysRevD.65.053007 | WIS/17/01-AUG-DPP | hep-ph | null | In left-right symmetric models (LRSM) the light neutrino masses arise from
two sources: the seesaw mechanism and a VEV of an SU(2)$_L$ triplet. If the
left-right symmetry breaking, $v_R$, is low, $v_R\lsim15\TeV$, the
contributions to the light neutrino masses from both the seesaw mechanism and
the triplet Yukawa couplings are expected to be well above the experimental
bounds. We present a minimal LRSM with an additional U(1) symmetry in which the
masses induced by the two sources are below the eV scale and the two-fold
problem is solved. We further show that, if the U(1) symmetry is also
responsible for the lepton flavor structure, the model yields a small mixing
angle within the first two lepton generations.
| [
{
"created": "Wed, 22 Aug 2001 16:21:06 GMT",
"version": "v1"
},
{
"created": "Sun, 3 Feb 2002 11:06:41 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Khasanov",
"Oleg",
""
],
[
"Perez",
"Gilad",
""
]
] | In left-right symmetric models (LRSM) the light neutrino masses arise from two sources: the seesaw mechanism and a VEV of an SU(2)$_L$ triplet. If the left-right symmetry breaking, $v_R$, is low, $v_R\lsim15\TeV$, the contributions to the light neutrino masses from both the seesaw mechanism and the triplet Yukawa couplings are expected to be well above the experimental bounds. We present a minimal LRSM with an additional U(1) symmetry in which the masses induced by the two sources are below the eV scale and the two-fold problem is solved. We further show that, if the U(1) symmetry is also responsible for the lepton flavor structure, the model yields a small mixing angle within the first two lepton generations. |
1905.13273 | Rachik Soualah | Rachik Soualah, Salah Nasri and Safa Naseem | Probing the Majorana Nature in Radiative Neutrino mass models with the
same-sign dilepton final states at future colliders | Contribution to the 2019 EW session of the 54th Rencontres de Moriond | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Neutrinos in the Standard Model (SM) are considered to be massless which is
in contradiction with the evidence from the neutrino oscillation data. These
experiments established that at least two SM neutrinos have non-zero masses and
that individual lepton numbers are violated. This is strong evidence of new
physics beyond the SM that should be responsible for generating non zero mass
for the neutrinos. In this work, we study the collider phenomenology of an
extension of the SM where neutrinos are generated radiatively at three-loop. We
show that the production of same-sign dilepton at lepton colliders (such as
FCC-ee and ILC) can be used to probe the Majorana nature of neutrinos in this
class of models.
| [
{
"created": "Thu, 30 May 2019 19:37:27 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Jun 2019 18:20:36 GMT",
"version": "v2"
}
] | 2019-06-11 | [
[
"Soualah",
"Rachik",
""
],
[
"Nasri",
"Salah",
""
],
[
"Naseem",
"Safa",
""
]
] | Neutrinos in the Standard Model (SM) are considered to be massless which is in contradiction with the evidence from the neutrino oscillation data. These experiments established that at least two SM neutrinos have non-zero masses and that individual lepton numbers are violated. This is strong evidence of new physics beyond the SM that should be responsible for generating non zero mass for the neutrinos. In this work, we study the collider phenomenology of an extension of the SM where neutrinos are generated radiatively at three-loop. We show that the production of same-sign dilepton at lepton colliders (such as FCC-ee and ILC) can be used to probe the Majorana nature of neutrinos in this class of models. |
hep-ph/0207161 | Anna M. Stasto | A.M. Stasto | Running coupling and BFKL pomeron | 5 pages, 2 figures, talk given at 10th International Workshop on Deep
Inelastic Scattering (DIS2002), Cracow, Poland, 30 Apr - 4 May 2002 | Acta Phys.Polon. B33 (2002) 3039-3044 | null | null | hep-ph | null | We show that in the case of the BFKL pomeron with running coupling the
diffusion pattern is strongly modified and is characterised by the sudden
tunneling transition to the non-perturbative regime. We suggest that by using
the b - expansion method one can suppress the non-perturbative Pomeron and
isolate purely perturbative part of the gluon Green's function.
| [
{
"created": "Fri, 12 Jul 2002 16:29:03 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Stasto",
"A. M.",
""
]
] | We show that in the case of the BFKL pomeron with running coupling the diffusion pattern is strongly modified and is characterised by the sudden tunneling transition to the non-perturbative regime. We suggest that by using the b - expansion method one can suppress the non-perturbative Pomeron and isolate purely perturbative part of the gluon Green's function. |
hep-ph/9803221 | Hans-Werner Hammer | L.L. Barz (1,2), H. Forkel (3,4), H.-W. Hammer (5,6), F.S. Navarra
(1), M. Nielsen (1), and M.J. Ramsey-Musolf (6,7) ((1) Sao Paulo, (2)
Joinville, (3) Trento, (4) Heidelberg, (5) TRIUMF, (6) INT, (7) Connecticut) | K^* Mesons and Nucleon Strangeness | 21 pages, RevTex, 2 PS figures included with epsf.sty | Nucl.Phys. A640 (1998) 259-280 | 10.1016/S0375-9474(98)00438-2 | DOE/ER/40561-345-INT97-00-184 | hep-ph nucl-th | null | We study contributions to the nucleon strange quark vector current form
factors from intermediate states containing K^* mesons. We show how these
contributions may be comparable in magnitude to those made by K mesons, using
methods complementary to those employed in quark model studies. We also analyze
the degree of theoretical uncertainty associated with K^* contributions.
| [
{
"created": "Mon, 2 Mar 1998 20:04:15 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Barz",
"L. L.",
""
],
[
"Forkel",
"H.",
""
],
[
"Hammer",
"H. -W.",
""
],
[
"Navarra",
"F. S.",
""
],
[
"Nielsen",
"M.",
""
],
[
"Ramsey-Musolf",
"M. J.",
""
]
] | We study contributions to the nucleon strange quark vector current form factors from intermediate states containing K^* mesons. We show how these contributions may be comparable in magnitude to those made by K mesons, using methods complementary to those employed in quark model studies. We also analyze the degree of theoretical uncertainty associated with K^* contributions. |
1406.5334 | George Savvidy K | George Savvidy | Tensor gluons and proton structure | LaTex file, 18 pages, 2 figures, note added. arXiv admin note: text
overlap with arXiv:1310.0856 | Theor.Math.Phys. 182 (2015) 1, 114-129 | 10.1007/s11232-015-0250-x | NRCPS-HE-28-2014 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a recent article we were considering a possibility that inside a proton
and, more generally, inside hadrons there could be additional partons -
tensor-gluons, which carry a part of the proton momentum. Tensor-gluons have
zero electric charge, like gluons, but have a larger spin. Therefore we call
them tensor-gluons. The nonzero density of tensor-gluons can be generated by
the emission of tensor-gluons by gluons. Tensor-gluons can further split into
the pairs of tensor-gluons through a different channels. To describe all these
processes one should know the general splitting probabilities for
tensor-gluons. These probabilities should fulfill very general symmetry
relations, which we were able to resolve by introducing a splitting index. This
approach allows to find out the general form of the splitting functions, to
derive corresponding DGLAP evolution equations and to calculate the one-loop
Callan-Simanzik beta function for tensor-gluons of a given spin. Our results
provide a nontrivial consistency check of the theory and of the Callan-Simanzik
beta function calculations, because the theory has a unique coupling constant
and its high energy behavior should be universal for all particles of the
spectrum. We argue that the contribution of all spins into the beta function
vanishes leading to a conformal invariant theory at very high energies.
| [
{
"created": "Fri, 20 Jun 2014 09:45:23 GMT",
"version": "v1"
},
{
"created": "Sun, 14 Dec 2014 17:43:13 GMT",
"version": "v2"
}
] | 2015-02-10 | [
[
"Savvidy",
"George",
""
]
] | In a recent article we were considering a possibility that inside a proton and, more generally, inside hadrons there could be additional partons - tensor-gluons, which carry a part of the proton momentum. Tensor-gluons have zero electric charge, like gluons, but have a larger spin. Therefore we call them tensor-gluons. The nonzero density of tensor-gluons can be generated by the emission of tensor-gluons by gluons. Tensor-gluons can further split into the pairs of tensor-gluons through a different channels. To describe all these processes one should know the general splitting probabilities for tensor-gluons. These probabilities should fulfill very general symmetry relations, which we were able to resolve by introducing a splitting index. This approach allows to find out the general form of the splitting functions, to derive corresponding DGLAP evolution equations and to calculate the one-loop Callan-Simanzik beta function for tensor-gluons of a given spin. Our results provide a nontrivial consistency check of the theory and of the Callan-Simanzik beta function calculations, because the theory has a unique coupling constant and its high energy behavior should be universal for all particles of the spectrum. We argue that the contribution of all spins into the beta function vanishes leading to a conformal invariant theory at very high energies. |
0708.0260 | Samoil Bilenky M. | S. M. Bilenky | Recoilless Resonance Absorption of Tritium Antineutrinos and Time-Energy
Uncertainty Relation | null | null | null | null | hep-ph | null | We discuss neutrino oscillations in an experiment with M\"ossbauer recoilless
resonance absorbtion of tritium antineutrinos, proposed recently by Raghavan.
We demonstrate that small energy uncertainty of antineutrinos which ensures a
large resonance absorption cross section is in a conflict with the energy
uncertainty which, according to the time-energy uncertainty relation, is
necessary for neutrino oscillations to happen. The search for neutrino
oscillations in the M\"ossbauer neutrino experiment would be an important test
of the applicability of the time-energy uncertainty relation to a newly
discovered interference phenomenon.
| [
{
"created": "Thu, 2 Aug 2007 02:22:59 GMT",
"version": "v1"
}
] | 2007-08-03 | [
[
"Bilenky",
"S. M.",
""
]
] | We discuss neutrino oscillations in an experiment with M\"ossbauer recoilless resonance absorbtion of tritium antineutrinos, proposed recently by Raghavan. We demonstrate that small energy uncertainty of antineutrinos which ensures a large resonance absorption cross section is in a conflict with the energy uncertainty which, according to the time-energy uncertainty relation, is necessary for neutrino oscillations to happen. The search for neutrino oscillations in the M\"ossbauer neutrino experiment would be an important test of the applicability of the time-energy uncertainty relation to a newly discovered interference phenomenon. |
1203.1041 | Stefania Gori | Marcela Carena, Stefania Gori, Aurelio Juste, Arjun Menon, Carlos E.
M. Wagner, Lian-Tao Wang | LHC Discovery Potential for Non-Standard Higgs Bosons in the 3b Channel | 14 pages, 3 figures, 4 tables, references added, published version | null | 10.1007/JHEP07(2012)091 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a variety of well motivated models, such as two Higgs Doublet Models
(2HDMs) and the Minimal Supersymmetric Standard Model (MSSM), there are neutral
Higgs bosons that have significantly enhanced couplings to b-quarks and tau
leptons in comparison to those of the SM Higgs. These so called non-standard
Higgs bosons could be copiously produced at the LHC in association with b
quarks, and subsequently decay into b-quark pairs. However, this production
channel suffers from large irreducible QCD backgrounds. We propose a new search
strategy for non-standard neutral Higgs bosons at the 7 TeV LHC in the 3b's
final state topology. We perform a simulation of the signal and backgrounds,
using state of the art tools and methods for different sets of selection cuts,
and conclude that neutral Higgs bosons with couplings to b-quarks of about 0.3
or larger, and masses up to 400 GeV, could be seen with a luminosity of 30
fb^{-1}. In the case of the MSSM we also discuss the complementarity between
the 3b channel and the inclusive tau pair channel in exploring the
supersymmetric parameter space.
| [
{
"created": "Mon, 5 Mar 2012 21:00:40 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Jun 2012 20:01:55 GMT",
"version": "v2"
}
] | 2015-06-04 | [
[
"Carena",
"Marcela",
""
],
[
"Gori",
"Stefania",
""
],
[
"Juste",
"Aurelio",
""
],
[
"Menon",
"Arjun",
""
],
[
"Wagner",
"Carlos E. M.",
""
],
[
"Wang",
"Lian-Tao",
""
]
] | In a variety of well motivated models, such as two Higgs Doublet Models (2HDMs) and the Minimal Supersymmetric Standard Model (MSSM), there are neutral Higgs bosons that have significantly enhanced couplings to b-quarks and tau leptons in comparison to those of the SM Higgs. These so called non-standard Higgs bosons could be copiously produced at the LHC in association with b quarks, and subsequently decay into b-quark pairs. However, this production channel suffers from large irreducible QCD backgrounds. We propose a new search strategy for non-standard neutral Higgs bosons at the 7 TeV LHC in the 3b's final state topology. We perform a simulation of the signal and backgrounds, using state of the art tools and methods for different sets of selection cuts, and conclude that neutral Higgs bosons with couplings to b-quarks of about 0.3 or larger, and masses up to 400 GeV, could be seen with a luminosity of 30 fb^{-1}. In the case of the MSSM we also discuss the complementarity between the 3b channel and the inclusive tau pair channel in exploring the supersymmetric parameter space. |
0805.4202 | Ismail Turan | Durmus A. Demir (IZTECH and DESY), Mariana Frank (Concordia Univ.),
Katri Huitu, Santosh K. Rai (Univ. of Helsinki), and Ismail Turan (Concordia
Univ.) | Signals of Doubly-Charged Higgsinos at the CERN Large Hadron Collider | 14 pages, two-column format, 13 figures, 1 table | Phys.Rev.D78:035013,2008 | 10.1103/PhysRevD.78.035013 | DESY-08-060, IZTECH-P-08-03, CUMQ-HEP-149, HIP-2008-15/TH | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Several supersymmetric models with extended gauge structures, motivated by
either grand unification or by neutrino mass generation, predict light
doubly-charged Higgsinos. In this work we study productions and decays of
doubly-charged Higgsinos present in left-right supersymmetric models, and show
that they invariably lead to novel collider signals not found in the minimal
supersymmetric model (MSSM) or in any of its extensions motivated by the \mu
problem or even in extra dimensional theories. We investigate their distinctive
signatures at the Large Hadron Collider (LHC) in both pair-- and
single--production modes, and show that they are powerful tools in determining
the underlying model via the measurements at the LHC experiments.
| [
{
"created": "Tue, 27 May 2008 20:24:23 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Demir",
"Durmus A.",
"",
"IZTECH and DESY"
],
[
"Frank",
"Mariana",
"",
"Concordia Univ."
],
[
"Huitu",
"Katri",
"",
"Univ. of Helsinki"
],
[
"Rai",
"Santosh K.",
"",
"Univ. of Helsinki"
],
[
"Turan",
"Ismail",
"",
"Concordia\n Univ."
]
] | Several supersymmetric models with extended gauge structures, motivated by either grand unification or by neutrino mass generation, predict light doubly-charged Higgsinos. In this work we study productions and decays of doubly-charged Higgsinos present in left-right supersymmetric models, and show that they invariably lead to novel collider signals not found in the minimal supersymmetric model (MSSM) or in any of its extensions motivated by the \mu problem or even in extra dimensional theories. We investigate their distinctive signatures at the Large Hadron Collider (LHC) in both pair-- and single--production modes, and show that they are powerful tools in determining the underlying model via the measurements at the LHC experiments. |
hep-ph/0306252 | Mahadev Patgiri | Mahadev Patgiri and N. Nimai Singh | Inverted Hierarchical Model of Neutrino Masses Revisited | 4pages (To appear in Physics Letters B | Phys.Lett. B567 (2003) 69-72 | 10.1016/j.physletb.2003.06.021 | null | hep-ph | null | In this letter we highlight the inherent problems associted with the inverted
hierarchical model of neutrinos with only three generations and suggest
possible solutions within the MSSM. we discuss the new parametrisation of the
solar mixing angle which can identify the light side and dark side of the data.
We then argue whether the inverted hierarchical neutrino mass matrix can
explain the large mixing angle(LMA) MSW solution of the solar neutrino anomaly
in the presence of an appropriate texture of charged lepton mass matrix. In
model independent way we explore such specific form of the charged lepton mass
matrix having special structure in 1-2 block. The contribution to the solar
mass splitting arising out of radiative corrections in MSSM, is calculated,
thus making the model stable under radiative corrections.
| [
{
"created": "Wed, 25 Jun 2003 18:41:31 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Patgiri",
"Mahadev",
""
],
[
"Singh",
"N. Nimai",
""
]
] | In this letter we highlight the inherent problems associted with the inverted hierarchical model of neutrinos with only three generations and suggest possible solutions within the MSSM. we discuss the new parametrisation of the solar mixing angle which can identify the light side and dark side of the data. We then argue whether the inverted hierarchical neutrino mass matrix can explain the large mixing angle(LMA) MSW solution of the solar neutrino anomaly in the presence of an appropriate texture of charged lepton mass matrix. In model independent way we explore such specific form of the charged lepton mass matrix having special structure in 1-2 block. The contribution to the solar mass splitting arising out of radiative corrections in MSSM, is calculated, thus making the model stable under radiative corrections. |
hep-ph/0008315 | Michael McNeil Forbes | Michael McNeil Forbes, Ariel R. Zhitnitsky (University of British
Columbia, Canada) | Domain Walls in QCD | 44 Pages (LaTeX JHEP), 8 Figures. Final Version. Improved
explanations based on referee's comments | JHEP 0110:013,2001 | 10.1088/1126-6708/2001/10/013 | null | hep-ph hep-th nucl-th | null | QCD was shown to have a nontrivial vacuum structure due to the topology of
the theta = theta+2*pi*n parameter. As a result of this nontrivial topology, in
the large N_c limit, quasi-stable QCD domain walls appear, characterized by a
transition in the singlet eta' field. We discuss the physics of these QCD
domain walls as well as related axion domain walls and we present a new type of
axion wall which also contains an eta' transition. We argue that these domain
walls are topologically stable in the limit N_c->infinity and classically
stable for large but finite N_c, however, they can decay through a tunneling
process. We argue that the qualitative features of these QCD domain walls --
namely their classical stability -- persist to the realistic case of N_c=3 and
that it is at least possible that their lifetime could be macroscopically
large. If it is, then QCD domain walls could play an important role in the
evolution of early universe and may be detectable in energetic collisions such
as those at the Relativistic Heavy Ion Collider (RHIC).
| [
{
"created": "Wed, 30 Aug 2000 17:54:28 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Jun 2001 23:26:22 GMT",
"version": "v2"
},
{
"created": "Thu, 15 Nov 2001 00:30:17 GMT",
"version": "v3"
}
] | 2010-02-03 | [
[
"Forbes",
"Michael McNeil",
"",
"University of British\n Columbia, Canada"
],
[
"Zhitnitsky",
"Ariel R.",
"",
"University of British\n Columbia, Canada"
]
] | QCD was shown to have a nontrivial vacuum structure due to the topology of the theta = theta+2*pi*n parameter. As a result of this nontrivial topology, in the large N_c limit, quasi-stable QCD domain walls appear, characterized by a transition in the singlet eta' field. We discuss the physics of these QCD domain walls as well as related axion domain walls and we present a new type of axion wall which also contains an eta' transition. We argue that these domain walls are topologically stable in the limit N_c->infinity and classically stable for large but finite N_c, however, they can decay through a tunneling process. We argue that the qualitative features of these QCD domain walls -- namely their classical stability -- persist to the realistic case of N_c=3 and that it is at least possible that their lifetime could be macroscopically large. If it is, then QCD domain walls could play an important role in the evolution of early universe and may be detectable in energetic collisions such as those at the Relativistic Heavy Ion Collider (RHIC). |
hep-ph/9712512 | Stephen Parke | Stephen Parke (Fermi National Accelerator Laboratory) | Top Quark Physics: Overview | 15 pages, 12 figures, Latex, sprocl.sty presentation at the
International Symposium on ``QCD Corrections and New Physics'' October 27-29,
1997 held at Hiroshima, Japan | null | null | FERMILAB-Conf-97/431-T | hep-ph | null | In this presentation I will primarily focus on top quark physics but I will
include a discussion of the W-boson mass and the possibility of discovering a
light Higgs boson via associated production at the Tevatron.
| [
{
"created": "Tue, 23 Dec 1997 18:18:05 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Parke",
"Stephen",
"",
"Fermi National Accelerator Laboratory"
]
] | In this presentation I will primarily focus on top quark physics but I will include a discussion of the W-boson mass and the possibility of discovering a light Higgs boson via associated production at the Tevatron. |
1508.07078 | Koji Ichikawa | Takeshi Fukuyama, Koji Ichikawa and Yukihiro Mimura | Revisiting fermion mass and mixing fits in the minimal SUSY $SO(10)$ GUT | This is the version to be published in Phys.Rev.D. The old subsection
of proton decay is discussed in a separate form, arXiv:1609.08640 | Phys. Rev. D 94, 075018 (2016) | 10.1103/PhysRevD.94.075018 | IPMU15-0141 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Supersymmetric $SO(10)$ grand unified models with renormalizable Yukawa
couplings involving only ${\bf 10}$ and $\overline{\bf 126}$ Higgs fields have
been shown to realize the fermion masses and mixings economically. In previous
works, the sum rule of the fermion mass matrices are given by inputting the
quark matrices, and the neutrino mixings are predicted in this framework. Now
the three neutrino mixings have been measured, and in this paper, we give the
sum rule by inputting the lepton mass matrices, which makes clear certain
features of the solution, especially if the vacuum expectation values of ${\bf
126}+ \overline{\bf126}$ ($v_R$) are large and the right-handed neutrinos are
heavy. We perform the $\chi^2$ analyses to fit the fermion masses and mixings
using the sum rule. In previous works, the best fit appears at $v_R \sim
10^{13}$ GeV, and the fit at the large $v_R$ scale ($\sim 10^{16}$ GeV) has
been less investigated. Our expression of the sum rule has a benefit to
understand the flavor structure in the large $v_R$ solution. Using the fit
results, we perform the calculation of the $\mu \to e\gamma$ process and the
electric dipole moment of electron, and the importance of $v_R$ dependence
emerges in low energy phenomena. We also show the prediction of the CP phase in
the neutrino oscillations, which can be tested in the near future.
| [
{
"created": "Fri, 28 Aug 2015 02:54:23 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Oct 2016 11:05:42 GMT",
"version": "v2"
}
] | 2016-11-02 | [
[
"Fukuyama",
"Takeshi",
""
],
[
"Ichikawa",
"Koji",
""
],
[
"Mimura",
"Yukihiro",
""
]
] | Supersymmetric $SO(10)$ grand unified models with renormalizable Yukawa couplings involving only ${\bf 10}$ and $\overline{\bf 126}$ Higgs fields have been shown to realize the fermion masses and mixings economically. In previous works, the sum rule of the fermion mass matrices are given by inputting the quark matrices, and the neutrino mixings are predicted in this framework. Now the three neutrino mixings have been measured, and in this paper, we give the sum rule by inputting the lepton mass matrices, which makes clear certain features of the solution, especially if the vacuum expectation values of ${\bf 126}+ \overline{\bf126}$ ($v_R$) are large and the right-handed neutrinos are heavy. We perform the $\chi^2$ analyses to fit the fermion masses and mixings using the sum rule. In previous works, the best fit appears at $v_R \sim 10^{13}$ GeV, and the fit at the large $v_R$ scale ($\sim 10^{16}$ GeV) has been less investigated. Our expression of the sum rule has a benefit to understand the flavor structure in the large $v_R$ solution. Using the fit results, we perform the calculation of the $\mu \to e\gamma$ process and the electric dipole moment of electron, and the importance of $v_R$ dependence emerges in low energy phenomena. We also show the prediction of the CP phase in the neutrino oscillations, which can be tested in the near future. |
1506.08003 | Motohiko Yoshimura | M. Yoshimura and N. Sasao | Determination of CP violation parameter using neutrino pair beam | 9 pages, 6 figures | null | 10.1016/j.physletb.2015.12.040 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Neutrino oscillation experiments under neutrino pair beam from circulating
excited heavy ions are studied. It is found that detection of double weak
events has a good sensitivity to measure CP violating parameter and distinguish
mass hierarchy patterns in short baseline experiments in which the
earth-induced matter effect is minimized.
| [
{
"created": "Fri, 26 Jun 2015 09:10:14 GMT",
"version": "v1"
}
] | 2015-12-23 | [
[
"Yoshimura",
"M.",
""
],
[
"Sasao",
"N.",
""
]
] | Neutrino oscillation experiments under neutrino pair beam from circulating excited heavy ions are studied. It is found that detection of double weak events has a good sensitivity to measure CP violating parameter and distinguish mass hierarchy patterns in short baseline experiments in which the earth-induced matter effect is minimized. |
1408.1627 | Gudrun Hiller | Gudrun Hiller, Martin Schmaltz | $R_K$ and future $b \to s \ell \ell$ BSM opportunities | 8 pages | Phys. Rev. D 90, 054014 (2014) | 10.1103/PhysRevD.90.054014 | DO-TH 14/17 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Flavor changing neutral current $|\Delta B|=|\Delta S|=1$ processes are
sensitive to possible new physics at the electroweak scale and beyond,
providing detailed information about flavor, chirality and Lorentz structure.
Recently the LHCb collaboration announced a $2.6 \sigma$ deviation in the
measurement of $R_K={\cal{B}}(\bar B \to \bar K \mu \mu)/{\cal{B}}(\bar B \to
\bar K ee)$ from the standard model's prediction of lepton universality. We
identify dimension six operators which could explain this deviation and study
constraints from other measurements. Vector and axial-vector four-fermion
operators with flavor structure $\bar s b \bar \ell \ell$ can provide a good
description of the data. Tensor operators cannot describe the data.
Pseudo-scalar and scalar operators only fit the data with some fine-tuning;
they can be further probed with the $\bar B \to \bar K ee$ angular
distribution. The data appears to point towards $C_9^{\rm NP \mu} =
-C_{10}^{\rm NP \mu }<0$, an $SU(2)_{L}$ invariant direction in parameter space
supported by $R_K$, the $\bar B \to \bar K^* \mu \mu$ forward-backward
asymmetry and the $\bar B_s \to \mu \mu$ branching ratio, which is currently
allowed to be smaller than the standard model prediction. We present two
leptoquark models which can explain the FCNC data and give predictions for the
LHC and rare decays.
| [
{
"created": "Thu, 7 Aug 2014 15:45:17 GMT",
"version": "v1"
}
] | 2014-09-24 | [
[
"Hiller",
"Gudrun",
""
],
[
"Schmaltz",
"Martin",
""
]
] | Flavor changing neutral current $|\Delta B|=|\Delta S|=1$ processes are sensitive to possible new physics at the electroweak scale and beyond, providing detailed information about flavor, chirality and Lorentz structure. Recently the LHCb collaboration announced a $2.6 \sigma$ deviation in the measurement of $R_K={\cal{B}}(\bar B \to \bar K \mu \mu)/{\cal{B}}(\bar B \to \bar K ee)$ from the standard model's prediction of lepton universality. We identify dimension six operators which could explain this deviation and study constraints from other measurements. Vector and axial-vector four-fermion operators with flavor structure $\bar s b \bar \ell \ell$ can provide a good description of the data. Tensor operators cannot describe the data. Pseudo-scalar and scalar operators only fit the data with some fine-tuning; they can be further probed with the $\bar B \to \bar K ee$ angular distribution. The data appears to point towards $C_9^{\rm NP \mu} = -C_{10}^{\rm NP \mu }<0$, an $SU(2)_{L}$ invariant direction in parameter space supported by $R_K$, the $\bar B \to \bar K^* \mu \mu$ forward-backward asymmetry and the $\bar B_s \to \mu \mu$ branching ratio, which is currently allowed to be smaller than the standard model prediction. We present two leptoquark models which can explain the FCNC data and give predictions for the LHC and rare decays. |
hep-ph/9805452 | Yan Hua-gang | Chao-Shang Huang, Cong-Feng Qiao, and Hua-Gang Yan | Decay $\Lambda_b \to p l \bar \nu$ in QCD sum rules | 6 pages Latex file, 4 figures, corrected file forms | Phys.Lett. B437 (1998) 403-407 | 10.1016/S0370-2693(98)00909-5 | null | hep-ph | null | The $\Lambda_b \to p$ semileptonic decay is analyzed by using QCD sum rules
within the framework of heavy quark effective theory. The Isgur-Wise function
of $\Lambda_b \to p l \bar\nu$ has been calculated. The decay width is given.
| [
{
"created": "Tue, 26 May 1998 02:15:04 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Jul 1998 01:32:19 GMT",
"version": "v2"
},
{
"created": "Fri, 14 Aug 1998 04:02:23 GMT",
"version": "v3"
}
] | 2009-10-31 | [
[
"Huang",
"Chao-Shang",
""
],
[
"Qiao",
"Cong-Feng",
""
],
[
"Yan",
"Hua-Gang",
""
]
] | The $\Lambda_b \to p$ semileptonic decay is analyzed by using QCD sum rules within the framework of heavy quark effective theory. The Isgur-Wise function of $\Lambda_b \to p l \bar\nu$ has been calculated. The decay width is given. |
0910.1642 | Toshitaka Tatsumi | T. Tatsumi | Ferromagnetic properties of quark matter -an origin of magnetic field in
compact stars- | to appear in Proc. of CSQCD II | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Magnetic properties of quark matter are studied within the Landau
Fermi-liquid theory, and magnetic phase diagram of QCD is presented in the
density-temperature plane. The screening effect for gluon propagator is
emphasized to see the characteristic behavior of the magnetic susceptibility;
novel non-Fermi-liquid behavior is observed at finite temperature. Some
implications on the origin of the magnetic field in compact stars, especially
magnetars, are briefly discussed.
| [
{
"created": "Fri, 9 Oct 2009 02:25:59 GMT",
"version": "v1"
}
] | 2009-10-12 | [
[
"Tatsumi",
"T.",
""
]
] | Magnetic properties of quark matter are studied within the Landau Fermi-liquid theory, and magnetic phase diagram of QCD is presented in the density-temperature plane. The screening effect for gluon propagator is emphasized to see the characteristic behavior of the magnetic susceptibility; novel non-Fermi-liquid behavior is observed at finite temperature. Some implications on the origin of the magnetic field in compact stars, especially magnetars, are briefly discussed. |
1006.3846 | Chaehyun Yu | P. Ko, Chaehyun Yu (KIAS), Jungil Lee (Korea U.) | p p -> J/psi+Upsilon+X as a clean probe to the quarkonium production
mechanism | 5 pages, 3 figures, version published in Phys. Rev. D | Phys.Rev.D83:054015,2011 | 10.1103/PhysRevD.83.054015 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We report that, unlike most inclusive quarkonium-production processes, the
production rate for p p -> J/psi+Upsilon+X dominantly depends on two not
well-known long-distance nonrelativistic QCD matrix elements,
<O_8^{J/psi}(^3S_1)> and <O_8^{Upsilon}(^3S_1)> at leading order in the strong
coupling constant, which account for the transition probabilities of the
color-octet spin-triplet heavy-quark-antiquark pairs c\bar{c}_8(^3S_1) -> J/psi
and b\bar{b}_8(^3S_1) -> Upsilon, respectively. With the integrated luminosity
~ 100 fb^{-1} at the center-of-momentum energy sqrt{s}=14 TeV we expect that
approximately 1900 p p -> J/psi+Upsilon+X events can be observed at the CERN
Large Hadron Collider by tagging muon pairs, which are enough to probe to the
color-octet mechanism. The forthcoming measurement may provide a useful
constraint to resolve the decade-old puzzle for the polarization of prompt
J/psi at the Fermilab Tevatron. If corresponding measured rate is significantly
less than the prediction, it may imply that the current values for the
color-octet matrix elements are overestimated.
| [
{
"created": "Sat, 19 Jun 2010 07:11:24 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Mar 2011 05:52:48 GMT",
"version": "v2"
}
] | 2011-03-22 | [
[
"Ko",
"P.",
"",
"KIAS"
],
[
"Yu",
"Chaehyun",
"",
"KIAS"
],
[
"Lee",
"Jungil",
"",
"Korea U."
]
] | We report that, unlike most inclusive quarkonium-production processes, the production rate for p p -> J/psi+Upsilon+X dominantly depends on two not well-known long-distance nonrelativistic QCD matrix elements, <O_8^{J/psi}(^3S_1)> and <O_8^{Upsilon}(^3S_1)> at leading order in the strong coupling constant, which account for the transition probabilities of the color-octet spin-triplet heavy-quark-antiquark pairs c\bar{c}_8(^3S_1) -> J/psi and b\bar{b}_8(^3S_1) -> Upsilon, respectively. With the integrated luminosity ~ 100 fb^{-1} at the center-of-momentum energy sqrt{s}=14 TeV we expect that approximately 1900 p p -> J/psi+Upsilon+X events can be observed at the CERN Large Hadron Collider by tagging muon pairs, which are enough to probe to the color-octet mechanism. The forthcoming measurement may provide a useful constraint to resolve the decade-old puzzle for the polarization of prompt J/psi at the Fermilab Tevatron. If corresponding measured rate is significantly less than the prediction, it may imply that the current values for the color-octet matrix elements are overestimated. |
1801.03927 | Umit Kaya | U. Kaya and S. Sultansoy | Mass Pattern of the SM Fermions: Flavor Democracy Revisited | 8 pages, 2 Table. arXiv admin note: text overlap with
arXiv:1607.07623 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Mass pattern of the SM fermions is one of the most important mysterious in
particle physics. Flavor Democracy could shed light on this mystery. Addition
of isosinglet quark and isosinglet lepton give opportunity to obtain masses of
charged leptons and quarks of the 2nd and 3rd family due to small deviations of
full Flavor Democracy.
| [
{
"created": "Wed, 10 Jan 2018 20:04:44 GMT",
"version": "v1"
}
] | 2018-01-15 | [
[
"Kaya",
"U.",
""
],
[
"Sultansoy",
"S.",
""
]
] | Mass pattern of the SM fermions is one of the most important mysterious in particle physics. Flavor Democracy could shed light on this mystery. Addition of isosinglet quark and isosinglet lepton give opportunity to obtain masses of charged leptons and quarks of the 2nd and 3rd family due to small deviations of full Flavor Democracy. |
0704.3981 | Stephen West | Ben Gripaios and Stephen M. West | Anomaly Holography | 26 pages, references added | Nucl.Phys.B789:362-381,2008 | 10.1016/j.nuclphysb.2007.08.008 | OUTP-0705P | hep-ph hep-th | null | We consider, in the effective field theory context, anomalies of gauge field
theories on a slice of a five-dimensional, Anti-de Sitter geometry and their
four-dimensional, holographic duals. A consistent effective field theory
description can always be found, notwithstanding the presence of the anomalies
and without modifying the degrees of freedom of the theory. If anomalies do not
vanish, the d=4 theory contains additional pseudoscalar states, which are
either present in the low-energy theory as physical, light states, or are eaten
by (would-be massless) gauge bosons. We show that the pseudoscalars ensure that
global anomalies of the four-dimensional dual satisfy the 't Hooft matching
condition and comment on the relevance for warped models of electroweak
symmetry breaking.
| [
{
"created": "Mon, 30 Apr 2007 17:22:35 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Feb 2008 10:46:30 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Gripaios",
"Ben",
""
],
[
"West",
"Stephen M.",
""
]
] | We consider, in the effective field theory context, anomalies of gauge field theories on a slice of a five-dimensional, Anti-de Sitter geometry and their four-dimensional, holographic duals. A consistent effective field theory description can always be found, notwithstanding the presence of the anomalies and without modifying the degrees of freedom of the theory. If anomalies do not vanish, the d=4 theory contains additional pseudoscalar states, which are either present in the low-energy theory as physical, light states, or are eaten by (would-be massless) gauge bosons. We show that the pseudoscalars ensure that global anomalies of the four-dimensional dual satisfy the 't Hooft matching condition and comment on the relevance for warped models of electroweak symmetry breaking. |
1008.3886 | Wolfgang Bietenholz | Wolfgang Bietenholz | The Photon Dispersion as an Indicator for New Physics ? | 8 pages, 4 figures, talk presented at the VI International Workshop
on the Dark Side of the Universe, Leon (Mexico), June 1-6, 2010. References
added | J.Phys.Conf.Ser.315:012029,2011 | 10.1088/1742-6596/315/1/012029 | null | hep-ph astro-ph.HE hep-lat hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We first comment on the search for a deviation from the linear photon
dispersion relation, in particular based on cosmic photons from Gamma Ray
Bursts. Then we consider the non-commutative space as a theoretical concept
that could lead to such a deviation, which would be a manifestation of Lorentz
Invariance Violation. In particular we review a numerical study of pure U(1)
gauge theory in a 4d non-commutative space. Starting from a finite lattice, we
explore the phase diagram and the extrapolation to the continuum and infinite
volume. These simultaneous limits - taken at fixed non-commutativity - lead to
a phase of broken Poincare symmetry, where the photon appears to be IR stable,
despite a negative IR divergence to one loop.
| [
{
"created": "Mon, 23 Aug 2010 18:57:47 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Sep 2010 18:40:08 GMT",
"version": "v2"
}
] | 2011-08-25 | [
[
"Bietenholz",
"Wolfgang",
""
]
] | We first comment on the search for a deviation from the linear photon dispersion relation, in particular based on cosmic photons from Gamma Ray Bursts. Then we consider the non-commutative space as a theoretical concept that could lead to such a deviation, which would be a manifestation of Lorentz Invariance Violation. In particular we review a numerical study of pure U(1) gauge theory in a 4d non-commutative space. Starting from a finite lattice, we explore the phase diagram and the extrapolation to the continuum and infinite volume. These simultaneous limits - taken at fixed non-commutativity - lead to a phase of broken Poincare symmetry, where the photon appears to be IR stable, despite a negative IR divergence to one loop. |
1908.03755 | Lei Wang | Lei Wang, Yang Zhang | A $\mu$-$\tau$-philic Higgs doublet confronted with the muon g-2, $\tau$
decays and LHC data | 15 pages, 3 figures | Phys. Rev. D 100, 095005 (2019) | 10.1103/PhysRevD.100.095005 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a two-Higgs-doublet model in which one Higgs doublet has the same
interactions with fermions as the SM, and another Higgs doublet only has the
$\mu$-$\tau$ LFV interactions. Assuming that the Yukawa matrices are real and
symmetric, we impose various relevant theoretical and experimental constraints,
and find that the excesses of muon $g-2$ and lepton flavour universality in the
$\tau$ decays can be simultaneously explained in the region of small mass
splittings between the heavy CP-even Higgs and the CP-odd Higgs ($m_A > m_H$).
The multi-lepton event searches at the LHC can sizably reduce the mass ranges
of extra Higgses, and $m_H$ is required to be larger than 560 GeV.
| [
{
"created": "Sat, 10 Aug 2019 13:49:18 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Apr 2021 03:20:48 GMT",
"version": "v2"
}
] | 2021-04-09 | [
[
"Wang",
"Lei",
""
],
[
"Zhang",
"Yang",
""
]
] | We propose a two-Higgs-doublet model in which one Higgs doublet has the same interactions with fermions as the SM, and another Higgs doublet only has the $\mu$-$\tau$ LFV interactions. Assuming that the Yukawa matrices are real and symmetric, we impose various relevant theoretical and experimental constraints, and find that the excesses of muon $g-2$ and lepton flavour universality in the $\tau$ decays can be simultaneously explained in the region of small mass splittings between the heavy CP-even Higgs and the CP-odd Higgs ($m_A > m_H$). The multi-lepton event searches at the LHC can sizably reduce the mass ranges of extra Higgses, and $m_H$ is required to be larger than 560 GeV. |
1106.4697 | Imrich Zborovsky | I. Zborovsk\'y | Multiplicity distributions in proton-(anti)proton and electron-positron
collisions with parton recombination | 20 pages, 14 figures, 6 tables | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A new approach to phenomenological description of the charged particle
multiplicity distributions in proton-(anti)proton and electron-positron
collisions is presented. The observed features of the data are interpreted on
the basis of stochastic-physical ideas of multiple production. Besides the
processes of parton immigration and absorption, two and three patron
incremental and decremental recombinations are considered. The complex
behaviour of the multiplicity distributions at different energies is described
by four parametric generalized hypergeometric distribution (GHD). Application
of the proposed GHD to data measured by the CMS, ALICE, and ATLAS
Collaborations suggests that soft multiparton recombination processes can
manifest itself significantly in the structure of multiplicity distribution in
pp interactions at very high energies.
| [
{
"created": "Thu, 23 Jun 2011 12:28:46 GMT",
"version": "v1"
}
] | 2011-06-24 | [
[
"Zborovský",
"I.",
""
]
] | A new approach to phenomenological description of the charged particle multiplicity distributions in proton-(anti)proton and electron-positron collisions is presented. The observed features of the data are interpreted on the basis of stochastic-physical ideas of multiple production. Besides the processes of parton immigration and absorption, two and three patron incremental and decremental recombinations are considered. The complex behaviour of the multiplicity distributions at different energies is described by four parametric generalized hypergeometric distribution (GHD). Application of the proposed GHD to data measured by the CMS, ALICE, and ATLAS Collaborations suggests that soft multiparton recombination processes can manifest itself significantly in the structure of multiplicity distribution in pp interactions at very high energies. |
hep-ph/0602057 | Vladimir Kuksa | V.I. Kuksa | The convolution model of unstable particles | 11 pages, added reference, changed content | null | null | null | hep-ph | null | Quantum field model of unstable particles with random mass is suggested to
describe the finite-width effects in decay rate. Within the framework of this
model we derive the convolution formula for a width of the channels with
unstable particle in a final state. The distribution function of random mass is
considered for ustable particles of arbitrary type
| [
{
"created": "Tue, 7 Feb 2006 07:20:02 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Jun 2006 05:42:08 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Kuksa",
"V. I.",
""
]
] | Quantum field model of unstable particles with random mass is suggested to describe the finite-width effects in decay rate. Within the framework of this model we derive the convolution formula for a width of the channels with unstable particle in a final state. The distribution function of random mass is considered for ustable particles of arbitrary type |
1603.09621 | Eugene Zabrodin | J. Crkovska, J. Bielcik, L. Bravina, B.H. Brusheim Johansson, E.
Zabrodin, G. Eyyubova, V.L. Korotkikh, I.P. Lokhtin, L.V. Malinina, S.V.
Petrushanko, A.M. Snigirev | Influence of jets and decays of resonances on the triangular flow in
ultrarelativistic heavy-ion collisions | revised version | Phys. Rev. C 95 (2017) 014910 | 10.1103/PhysRevC.95.014910 | null | hep-ph nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Triangular flow $v_3$ of identified and inclusive particles in Pb+Pb
collisions at $\sqrt{s_{NN}} = 2.76$ TeV is studied as a function of centrality
and transverse momentum within the \textsc{hydjet++} model. The model enables
one to investigate the influence of both hard processes and final-state
interactions on the harmonics of particle anisotropic flow. Decays of
resonances are found to increase the magnitude of the $v_3(p_{\rm T})$
distributions at $p_{\rm T} \geq 2$ GeV/$c$ and shift their maxima to higher
transverse momenta. The $p_{\rm T}$-integrated triangular flow, however,
becomes slightly weakened for all centralities studied. The resonance decays
also modify the spectra towards the number-of-constituent-quark scaling
fulfillment for the triangular flow, whereas jets are the main source of the
scaling violation at the energies available at the CERN Large Hadron Collider
(LHC). Comparison with the corresponding spectra of elliptic flow reveals that
resonance decays and jets act in a similar manner on both $v_3(p_{\rm T})$ and
$v_2(p_{\rm T})$ behavior. Obtained results are also confronted with the
experimental data on differential triangular flow of identified hadrons, ratio
$v_3^{1/3}(p_{\rm T}) / v_2^{1/2}(p_{\rm T})$ and $p_{\rm T}$-integrated
triangular flow of charged hadrons.
| [
{
"created": "Thu, 31 Mar 2016 15:01:20 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Jan 2017 17:26:06 GMT",
"version": "v2"
}
] | 2017-01-26 | [
[
"Crkovska",
"J.",
""
],
[
"Bielcik",
"J.",
""
],
[
"Bravina",
"L.",
""
],
[
"Johansson",
"B. H. Brusheim",
""
],
[
"Zabrodin",
"E.",
""
],
[
"Eyyubova",
"G.",
""
],
[
"Korotkikh",
"V. L.",
""
],
[
"Lokhtin",
"I. P.",
""
],
[
"Malinina",
"L. V.",
""
],
[
"Petrushanko",
"S. V.",
""
],
[
"Snigirev",
"A. M.",
""
]
] | Triangular flow $v_3$ of identified and inclusive particles in Pb+Pb collisions at $\sqrt{s_{NN}} = 2.76$ TeV is studied as a function of centrality and transverse momentum within the \textsc{hydjet++} model. The model enables one to investigate the influence of both hard processes and final-state interactions on the harmonics of particle anisotropic flow. Decays of resonances are found to increase the magnitude of the $v_3(p_{\rm T})$ distributions at $p_{\rm T} \geq 2$ GeV/$c$ and shift their maxima to higher transverse momenta. The $p_{\rm T}$-integrated triangular flow, however, becomes slightly weakened for all centralities studied. The resonance decays also modify the spectra towards the number-of-constituent-quark scaling fulfillment for the triangular flow, whereas jets are the main source of the scaling violation at the energies available at the CERN Large Hadron Collider (LHC). Comparison with the corresponding spectra of elliptic flow reveals that resonance decays and jets act in a similar manner on both $v_3(p_{\rm T})$ and $v_2(p_{\rm T})$ behavior. Obtained results are also confronted with the experimental data on differential triangular flow of identified hadrons, ratio $v_3^{1/3}(p_{\rm T}) / v_2^{1/2}(p_{\rm T})$ and $p_{\rm T}$-integrated triangular flow of charged hadrons. |
hep-ph/9909207 | null | D. Falcone | Neutrino masses and mixings in a seesaw framework | 13 pages RevTex, no figures. Revised version | Phys.Rev. D61 (2000) 097302 | 10.1103/PhysRevD.61.097302 | DSF-T-99/30 | hep-ph | null | Assuming the seesaw mechanism for hierarchical neutrino masses, we calculate
the heavy neutrino masses under the hypotheses that the mixing in the Dirac
leptonic sector is similar to the quark mixing ($V_D \sim V_{CKM}$) and that
$M_{\nu} \sim M_u$ or $M_e$, where $M_{\nu}$ is the Dirac mass matrix of
neutrinos. As a result we find that for $M_{\nu} \sim M_u$ the vacuum
oscillation solution of the solar neutrino problem leads to a scale for the
heavy neutrino mass well above the unification scale, while for the MSW
solutions there is agreement with this scale. For $M_{\nu} \sim M_e$ the vacuum
solution is consistent with the unification scale, and the MSW solutions with
an intermediate scale. The mass of the lightest heavy neutrino can be as small
as $10^5$ GeV.
| [
{
"created": "Wed, 1 Sep 1999 09:57:59 GMT",
"version": "v1"
},
{
"created": "Fri, 26 Nov 1999 09:11:17 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Falcone",
"D.",
""
]
] | Assuming the seesaw mechanism for hierarchical neutrino masses, we calculate the heavy neutrino masses under the hypotheses that the mixing in the Dirac leptonic sector is similar to the quark mixing ($V_D \sim V_{CKM}$) and that $M_{\nu} \sim M_u$ or $M_e$, where $M_{\nu}$ is the Dirac mass matrix of neutrinos. As a result we find that for $M_{\nu} \sim M_u$ the vacuum oscillation solution of the solar neutrino problem leads to a scale for the heavy neutrino mass well above the unification scale, while for the MSW solutions there is agreement with this scale. For $M_{\nu} \sim M_e$ the vacuum solution is consistent with the unification scale, and the MSW solutions with an intermediate scale. The mass of the lightest heavy neutrino can be as small as $10^5$ GeV. |
hep-ph/9401320 | Simonov | Yu.A.Simonov | Chiral Effects in the Confining QCD Vacuum | 40 pages, preprint ITEP-83-93 | Phys.Atom.Nucl.57:1418-1433,1994; Yad.Fiz.57:1491-1506,1994 | null | null | hep-ph | null | Confining configurations are introduced into the standard instanton vacuum
model. This drastically improves theoretical properties of the vacuum:
instanton size density $d(\rho)$ stabilizes at $\rho\sim 0.2 fm$, all chiral
effects are formulated in a gauge-invariant way and quarks are confined. An
interesting interplay of chiral and confining dynamics is observed; for the
realistic values of parameters the Georgi-Manohar picture emerges with chiral
radius $R_{ch}\sim \rho\sim 0.2 fm$ much less than confining radius $R_c\sim$
hadron radius $\sim 1 fm$. In the limit $R_{ch}\ll R_c$ the chiral mass
$M_{ch}(p)$ is unaffected by confinement and can be taken in the local limit
$M_{ch}(p=0)$. Different types of effective chiral Lagrangians (ECL) are
obtained, containing all or a part of gluon, quark and Nambu--Goldstone--meson
fields. The ECL are manifestly gauge--invariant and in the limit of no gluon
fields coincide with those found previously.
The problem of the double role of the pion -- as a Goldstone meson or as a
$q\bar{q}$ system is briefly disscussed using confining ECL with quarks, mesons
and gluons.
| [
{
"created": "Tue, 25 Jan 1994 09:47:00 GMT",
"version": "v1"
}
] | 2009-07-28 | [
[
"Simonov",
"Yu. A.",
""
]
] | Confining configurations are introduced into the standard instanton vacuum model. This drastically improves theoretical properties of the vacuum: instanton size density $d(\rho)$ stabilizes at $\rho\sim 0.2 fm$, all chiral effects are formulated in a gauge-invariant way and quarks are confined. An interesting interplay of chiral and confining dynamics is observed; for the realistic values of parameters the Georgi-Manohar picture emerges with chiral radius $R_{ch}\sim \rho\sim 0.2 fm$ much less than confining radius $R_c\sim$ hadron radius $\sim 1 fm$. In the limit $R_{ch}\ll R_c$ the chiral mass $M_{ch}(p)$ is unaffected by confinement and can be taken in the local limit $M_{ch}(p=0)$. Different types of effective chiral Lagrangians (ECL) are obtained, containing all or a part of gluon, quark and Nambu--Goldstone--meson fields. The ECL are manifestly gauge--invariant and in the limit of no gluon fields coincide with those found previously. The problem of the double role of the pion -- as a Goldstone meson or as a $q\bar{q}$ system is briefly disscussed using confining ECL with quarks, mesons and gluons. |
2301.06621 | Timo K\"arkk\"ainen | Timo J. K\"arkk\"ainen, Zolt\'an Tr\'ocs\'anyi | Constraining flavour-universal nonstandard interactions and superweak
extension of the standard model | 23 pages, 10 pictures. The version approved for publication in PRD | null | 10.1103/PhysRevD.107.115020 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Nonstandard neutrino interactions (NSI) arising from light and heavy
mediators probe different sectors of the parameter space of models focusing on
phenomena that require the extension of the standard model. High-energy
scattering experiments are not relevant on constraining the NSI hiding a light
mediator at the fundamental level, while flavour-universal NSI cannot be probed
with neutrino oscillation experiments. Currently the only way to measure
flavour-universal NSI with a light mediator is to rely on coherent elastic
neutrino-nucleon scattering experiments, which we use to derive bounds for
light mediator flavour-universal NSI. For light NSI, we obtain $\varepsilon^u
\in [-14.85,14.79]$ and $\varepsilon^d \in [-13.19,13.84]$ (90~\% CL.). We also
derive constraints on flavour-universal heavy NSI and find a 2$\sigma$ tension.
Finally, we discuss the implications of the experiments on the allowed
parameter space of a specific example model, called superweak extension of the
standard model.
| [
{
"created": "Mon, 16 Jan 2023 21:59:56 GMT",
"version": "v1"
},
{
"created": "Tue, 23 May 2023 13:05:37 GMT",
"version": "v2"
}
] | 2023-06-28 | [
[
"Kärkkäinen",
"Timo J.",
""
],
[
"Trócsányi",
"Zoltán",
""
]
] | Nonstandard neutrino interactions (NSI) arising from light and heavy mediators probe different sectors of the parameter space of models focusing on phenomena that require the extension of the standard model. High-energy scattering experiments are not relevant on constraining the NSI hiding a light mediator at the fundamental level, while flavour-universal NSI cannot be probed with neutrino oscillation experiments. Currently the only way to measure flavour-universal NSI with a light mediator is to rely on coherent elastic neutrino-nucleon scattering experiments, which we use to derive bounds for light mediator flavour-universal NSI. For light NSI, we obtain $\varepsilon^u \in [-14.85,14.79]$ and $\varepsilon^d \in [-13.19,13.84]$ (90~\% CL.). We also derive constraints on flavour-universal heavy NSI and find a 2$\sigma$ tension. Finally, we discuss the implications of the experiments on the allowed parameter space of a specific example model, called superweak extension of the standard model. |
1705.07745 | Zhi-Gang Wang | Zhi-Gang Wang | Analysis of the $\Lambda_c(2860)$, $\Lambda_c(2880)$, $\Xi_c(3055)$ and
$\Xi_c(3080)$ as D-wave baryon states with QCD sum rules | 26 pages, 25 figures | Nucl. Phys. B926 (2018) 467-490 | 10.1016/j.nuclphysb.2017.11.014 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article, we tentatively assign the $\Lambda_c(2860)$,
$\Lambda_c(2880)$, $\Xi_c(3055)$ and $\Xi_c(3080)$ to be the D-wave baryon
states with the spin-parity $J^P={\frac{3}{2}}^+$, ${\frac{5}{2}}^+$,
${\frac{3}{2}}^+$ and ${\frac{5}{2}}^+$, respectively, and study their masses
and pole residues with the QCD sum rules in a systematic way by constructing
three-types interpolating currents with the quantum numbers
$(L_\rho,L_\lambda)=(0,2)$, $(2,0)$ and $(1,1)$, respectively. The present
predictions favor assigning the $\Lambda_c(2860)$, $\Lambda_c(2880)$,
$\Xi_c(3055)$ and $\Xi_c(3080)$ to be the D-wave baryon states with the quantum
numbers $(L_\rho,L_\lambda)=(0,2)$ and $J^P={\frac{3}{2}}^+$,
${\frac{5}{2}}^+$, ${\frac{3}{2}}^+$ and ${\frac{5}{2}}^+$, respectively. While
the predictions for the masses of the $(L_\rho,L_\lambda)=(2,0)$ and $(1,1)$
D-wave $\Lambda_c$ and $\Xi_c$ states can be confronted to the experimental
data in the future.
| [
{
"created": "Fri, 19 May 2017 14:39:13 GMT",
"version": "v1"
},
{
"created": "Sun, 18 Jun 2017 03:59:40 GMT",
"version": "v2"
},
{
"created": "Thu, 19 Oct 2017 01:29:41 GMT",
"version": "v3"
}
] | 2017-12-05 | [
[
"Wang",
"Zhi-Gang",
""
]
] | In this article, we tentatively assign the $\Lambda_c(2860)$, $\Lambda_c(2880)$, $\Xi_c(3055)$ and $\Xi_c(3080)$ to be the D-wave baryon states with the spin-parity $J^P={\frac{3}{2}}^+$, ${\frac{5}{2}}^+$, ${\frac{3}{2}}^+$ and ${\frac{5}{2}}^+$, respectively, and study their masses and pole residues with the QCD sum rules in a systematic way by constructing three-types interpolating currents with the quantum numbers $(L_\rho,L_\lambda)=(0,2)$, $(2,0)$ and $(1,1)$, respectively. The present predictions favor assigning the $\Lambda_c(2860)$, $\Lambda_c(2880)$, $\Xi_c(3055)$ and $\Xi_c(3080)$ to be the D-wave baryon states with the quantum numbers $(L_\rho,L_\lambda)=(0,2)$ and $J^P={\frac{3}{2}}^+$, ${\frac{5}{2}}^+$, ${\frac{3}{2}}^+$ and ${\frac{5}{2}}^+$, respectively. While the predictions for the masses of the $(L_\rho,L_\lambda)=(2,0)$ and $(1,1)$ D-wave $\Lambda_c$ and $\Xi_c$ states can be confronted to the experimental data in the future. |
hep-ph/9803354 | null | C. Hamzaoui and M. Pospelov | Up-Down Unification just above the supersymmetric threshold | 12 pages, latex, two figures | Eur.Phys.J.C8:151-156,1999 | 10.1007/s100529901053 | UQAM-PHE-98/01 | hep-ph | null | Large corrections to the quark mass matrices at the supersymmetric threshold
allow the theory to have identical Yukawa matrices in the superpotential. We
demonstrate that Up-Down unification can take place in a moderate quark-squark
alignment scenario with an average squark mass of the order 1 TeV and with
$\tan\beta>15$
| [
{
"created": "Sat, 14 Mar 1998 23:28:16 GMT",
"version": "v1"
}
] | 2011-02-01 | [
[
"Hamzaoui",
"C.",
""
],
[
"Pospelov",
"M.",
""
]
] | Large corrections to the quark mass matrices at the supersymmetric threshold allow the theory to have identical Yukawa matrices in the superpotential. We demonstrate that Up-Down unification can take place in a moderate quark-squark alignment scenario with an average squark mass of the order 1 TeV and with $\tan\beta>15$ |
2203.16356 | Edward Shuryak | Edward Shuryak, Ismail Zahed | Instanton effects in Euclidean vacuum, real time production and in the
light front wave functions | Lectures given at at 2021 Zakopane school, to appear in Acta Physica
Polonica | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Nontrivial topological structures of non-Abelian gauge fields were discovered
in the 1970's. Instanton solutions, describing vacuum tunneling through
topological barriers, have fermionic zero modes which are at the origin of
$^\prime$t Hooft effective Lagrangian. In the 1980's instanton ensembles have
been used to explain chiral symmetry breaking. In the 1990's a large set of
numerical simulations were performed deriving Euclidean correlation functions.
The special role of scalar diquarks in nucleons, and color superconductivity in
dense quark matter have been elucidated.
In these lectures, we discuss further developments of physics related to
gauge topology. We show that the instanton-antiinstanton "streamline"
configurations describe "sphaleron transitions" in high energy collisions,
which result in production of hadronic clusters with nontrivial
topological/chiral charges. (They are not yet observed, but discussions of
dedicated experiments at LHC and RHIC are ongoing.)
Another new direction is instanton effects in hadronic spectroscopy, both in
the rest frame and on the light front. We will discuss their role in central
and spin-dependent potentials, formfactors and antiquark nuclear "sea".
Finally, we summarize the advances in the semiclassical theory of
deconfinement, and chiral phase transitions at finite temperature, in QCD and
in some of its "deformed" versions.
| [
{
"created": "Wed, 30 Mar 2022 14:32:39 GMT",
"version": "v1"
}
] | 2022-03-31 | [
[
"Shuryak",
"Edward",
""
],
[
"Zahed",
"Ismail",
""
]
] | Nontrivial topological structures of non-Abelian gauge fields were discovered in the 1970's. Instanton solutions, describing vacuum tunneling through topological barriers, have fermionic zero modes which are at the origin of $^\prime$t Hooft effective Lagrangian. In the 1980's instanton ensembles have been used to explain chiral symmetry breaking. In the 1990's a large set of numerical simulations were performed deriving Euclidean correlation functions. The special role of scalar diquarks in nucleons, and color superconductivity in dense quark matter have been elucidated. In these lectures, we discuss further developments of physics related to gauge topology. We show that the instanton-antiinstanton "streamline" configurations describe "sphaleron transitions" in high energy collisions, which result in production of hadronic clusters with nontrivial topological/chiral charges. (They are not yet observed, but discussions of dedicated experiments at LHC and RHIC are ongoing.) Another new direction is instanton effects in hadronic spectroscopy, both in the rest frame and on the light front. We will discuss their role in central and spin-dependent potentials, formfactors and antiquark nuclear "sea". Finally, we summarize the advances in the semiclassical theory of deconfinement, and chiral phase transitions at finite temperature, in QCD and in some of its "deformed" versions. |
hep-ph/0005214 | Masahiro Yamaguchi | Fumihiro Takayama and Masahiro Yamaguchi | Gravitino Dark Matter without R-parity | 11 pages, 1 figure | Phys.Lett.B485:388-392,2000 | 10.1016/S0370-2693(00)00726-7 | TU-590 | hep-ph | null | Cosmological issues are examined when gravitino is the lightest superparticle
(LSP) and R-parity is broken. Decays of the next lightest superparticles occur
rapidly via R-parity violating interaction, and thus they do not upset the
big-bang nucleosynthesis, unlike the R-parity conserving case. The gravitino
LSP becomes unstable, but its lifetime is typically much longer than the age of
the Universe. It turns out that observations of diffuse photon background
coming from radiative decays of the gravitino do not severely constrain the
gravitino abundance, and thus the gravitino weighing less than around 1 GeV can
be dark matter of the Universe when bilinear R-parity violation generates a
neutrino mass which accounts for the atmospheric neutrino anomaly.
| [
{
"created": "Mon, 22 May 2000 07:59:25 GMT",
"version": "v1"
}
] | 2011-05-05 | [
[
"Takayama",
"Fumihiro",
""
],
[
"Yamaguchi",
"Masahiro",
""
]
] | Cosmological issues are examined when gravitino is the lightest superparticle (LSP) and R-parity is broken. Decays of the next lightest superparticles occur rapidly via R-parity violating interaction, and thus they do not upset the big-bang nucleosynthesis, unlike the R-parity conserving case. The gravitino LSP becomes unstable, but its lifetime is typically much longer than the age of the Universe. It turns out that observations of diffuse photon background coming from radiative decays of the gravitino do not severely constrain the gravitino abundance, and thus the gravitino weighing less than around 1 GeV can be dark matter of the Universe when bilinear R-parity violation generates a neutrino mass which accounts for the atmospheric neutrino anomaly. |
1910.01533 | Aniello Quaranta | Antonio Capolupo, Gaetano Lambiase, Aniello Quaranta, Salvatore Marco
Giampaolo | Probing axion mediated fermion--fermion interaction by means of
entanglement | 7 pages, 1 figure | Phys. Lett. B, Vol. 804, 135407 (2020) | 10.1016/j.physletb.2020.135407 | null | hep-ph hep-th quant-ph | http://creativecommons.org/licenses/by/4.0/ | We propose a new approach in the investigation and detection of axion and
axion-like particles based on the study of the entanglement for two interacting
fermions. We study a system made of two identical fermions with spin-1/2, and
we show that fermion-fermion interaction mediated by axions leads to a non-zero
entanglement between the fermions. An entanglement measurement can reveal the
interaction, providing an indirect evidence of the existence of axions. We
discuss how the other interactions affect the entanglement, and how to isolate
the axion contribution. Particular care is devoted to the analysis of the
magnetic dipole-dipole interaction, which turns out to be, apart from axions,
the most relevant contribution to the entanglement, and we show that it can be
suppressed by setting opportunely the duration of the observation. We also
introduce a two-body correlation function, which could be directly observed in
an experiment, and plays the role of an entanglement witness.
| [
{
"created": "Thu, 3 Oct 2019 14:48:49 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Oct 2019 17:04:27 GMT",
"version": "v2"
},
{
"created": "Sat, 30 Nov 2019 16:11:48 GMT",
"version": "v3"
},
{
"created": "Wed, 8 Apr 2020 18:01:26 GMT",
"version": "v4"
}
] | 2021-01-19 | [
[
"Capolupo",
"Antonio",
""
],
[
"Lambiase",
"Gaetano",
""
],
[
"Quaranta",
"Aniello",
""
],
[
"Giampaolo",
"Salvatore Marco",
""
]
] | We propose a new approach in the investigation and detection of axion and axion-like particles based on the study of the entanglement for two interacting fermions. We study a system made of two identical fermions with spin-1/2, and we show that fermion-fermion interaction mediated by axions leads to a non-zero entanglement between the fermions. An entanglement measurement can reveal the interaction, providing an indirect evidence of the existence of axions. We discuss how the other interactions affect the entanglement, and how to isolate the axion contribution. Particular care is devoted to the analysis of the magnetic dipole-dipole interaction, which turns out to be, apart from axions, the most relevant contribution to the entanglement, and we show that it can be suppressed by setting opportunely the duration of the observation. We also introduce a two-body correlation function, which could be directly observed in an experiment, and plays the role of an entanglement witness. |
1303.0003 | Mattias Blennow | Mattias Blennow, Pilar Coloma, Andrea Donini, Enrique
Fernandez-Martinez | Gain fractions of future neutrino oscillation facilities over T2K and
NOvA | JHEP style, 23 pages, 9 pdf figures | null | 10.1007/JHEP07(2013)159 | IFIC/13-07, IFT-UAM/CSIC-13-019, FTUAM-13-130 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We evaluate the probability of future neutrino oscillation facilities to
discover leptonic CP violation and/or measure the neutrino mass hierarchy. We
study how this probability is affected by positive or negative hints for these
observables to be found at T2K and NOvA. We consider the following facilities:
LBNE; T2HK; and the 10 GeV Neutrino Factory (NF10), and show how their
discovery probabilities change with the running time of T2K and NOvA
conditioned to their results. We find that, if after 15 years T2K and NOvA have
not observed a 90% CL hint of CP violation, then LBNE and T2HK have less than a
10% chance of achieving a 5sigma discovery, whereas NF10 still has a ca 40%
chance to do so. Conversely, if T2K and NOvA have an early 90% CL hint in 5
years from now, T2HK has a rather large chance to achieve a 5sigma CP violation
discovery (75% or 55%, depending on whether the mass hierarchy is known or
not). This is to be compared with the 90% (30%) probability that NF10 (LBNE)
would have to observe the same signal at 5sigma. A hierarchy measurement at
5sigma is achievable at both LBNE and NF10 with more than 90% probability,
irrespectively of the outcome of T2K and NOvA. We also find that if LBNE or a
similar very long baseline super-beam is the only next generation facility to
be built, then it is very useful to continue running T2K and NOvA (or at least
T2K) beyond their original schedule in order to increase the CP violation
discovery chances, given their complementarity.
| [
{
"created": "Thu, 28 Feb 2013 21:00:01 GMT",
"version": "v1"
}
] | 2015-06-15 | [
[
"Blennow",
"Mattias",
""
],
[
"Coloma",
"Pilar",
""
],
[
"Donini",
"Andrea",
""
],
[
"Fernandez-Martinez",
"Enrique",
""
]
] | We evaluate the probability of future neutrino oscillation facilities to discover leptonic CP violation and/or measure the neutrino mass hierarchy. We study how this probability is affected by positive or negative hints for these observables to be found at T2K and NOvA. We consider the following facilities: LBNE; T2HK; and the 10 GeV Neutrino Factory (NF10), and show how their discovery probabilities change with the running time of T2K and NOvA conditioned to their results. We find that, if after 15 years T2K and NOvA have not observed a 90% CL hint of CP violation, then LBNE and T2HK have less than a 10% chance of achieving a 5sigma discovery, whereas NF10 still has a ca 40% chance to do so. Conversely, if T2K and NOvA have an early 90% CL hint in 5 years from now, T2HK has a rather large chance to achieve a 5sigma CP violation discovery (75% or 55%, depending on whether the mass hierarchy is known or not). This is to be compared with the 90% (30%) probability that NF10 (LBNE) would have to observe the same signal at 5sigma. A hierarchy measurement at 5sigma is achievable at both LBNE and NF10 with more than 90% probability, irrespectively of the outcome of T2K and NOvA. We also find that if LBNE or a similar very long baseline super-beam is the only next generation facility to be built, then it is very useful to continue running T2K and NOvA (or at least T2K) beyond their original schedule in order to increase the CP violation discovery chances, given their complementarity. |
2402.14199 | Gramos Qerimi | Simone Biondini, Nora Brambilla, Gramos Qerimi, Antonio Vairo | Center-of-mass recoil effects on the annihilation and formation of dark
matter bound pairs | 7 pages, 1 figure; Talk given at EPS-HEP2023 and TAUP2023 | Proceedings of Science (PoS) 2024 | 10.22323/1.449.0112 | TUM-EFT 184/23 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | For a quantitative investigation on the time evolution of heavy thermal dark
matter at and after thermal freeze-out, near-threshold processes need to be
taken into account which have a large impact on the observed dark matter relic
abundance. In this conference paper, we study the recoil effect of heavy dark
matter pairs in a thermal bath and compute the annihilation cross section and
the decay width as well as the bound-state formation cross section of dark
matter fermion-antifermion pairs in the laboratory frame within the framework
of potential non-relativistic effective field theories at finite temperature.
For the considered hierarchy of energy scales, we highlight the effect of the
recoil corrections to the thermal rates.
| [
{
"created": "Thu, 22 Feb 2024 00:57:21 GMT",
"version": "v1"
}
] | 2024-02-23 | [
[
"Biondini",
"Simone",
""
],
[
"Brambilla",
"Nora",
""
],
[
"Qerimi",
"Gramos",
""
],
[
"Vairo",
"Antonio",
""
]
] | For a quantitative investigation on the time evolution of heavy thermal dark matter at and after thermal freeze-out, near-threshold processes need to be taken into account which have a large impact on the observed dark matter relic abundance. In this conference paper, we study the recoil effect of heavy dark matter pairs in a thermal bath and compute the annihilation cross section and the decay width as well as the bound-state formation cross section of dark matter fermion-antifermion pairs in the laboratory frame within the framework of potential non-relativistic effective field theories at finite temperature. For the considered hierarchy of energy scales, we highlight the effect of the recoil corrections to the thermal rates. |
2211.11670 | Manjunath Omana Kuttan | Manjunath Omana Kuttan, Jan Steinheimer, Kai Zhou, Horst Stoecker | QCD Equation of State of Dense Nuclear Matter from a Bayesian Analysis
of Heavy-Ion Collision Data | Replaced with the published version | Phys. Rev. Lett. 131, 202303 (2023) | 10.1103/PhysRevLett.131.202303 | null | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Bayesian methods are used to constrain the density dependence of the QCD
Equation of State (EoS) for dense nuclear matter using the data of mean
transverse kinetic energy and elliptic flow of protons from heavy ion
collisions (HIC), in the beam energy range $\sqrt{s_{\mathrm{NN}}}=2-10 GeV$.
The analysis yields tight constraints on the density dependent EoS up to 4
times the nuclear saturation density. The extracted EoS yields good agreement
with other observables measured in HIC experiments and constraints from
astrophysical observations both of which were not used in the inference. The
sensitivity of inference to the choice of observables is also discussed.
| [
{
"created": "Mon, 21 Nov 2022 17:39:26 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Nov 2022 12:10:18 GMT",
"version": "v2"
},
{
"created": "Fri, 17 Nov 2023 13:58:32 GMT",
"version": "v3"
}
] | 2023-11-20 | [
[
"Kuttan",
"Manjunath Omana",
""
],
[
"Steinheimer",
"Jan",
""
],
[
"Zhou",
"Kai",
""
],
[
"Stoecker",
"Horst",
""
]
] | Bayesian methods are used to constrain the density dependence of the QCD Equation of State (EoS) for dense nuclear matter using the data of mean transverse kinetic energy and elliptic flow of protons from heavy ion collisions (HIC), in the beam energy range $\sqrt{s_{\mathrm{NN}}}=2-10 GeV$. The analysis yields tight constraints on the density dependent EoS up to 4 times the nuclear saturation density. The extracted EoS yields good agreement with other observables measured in HIC experiments and constraints from astrophysical observations both of which were not used in the inference. The sensitivity of inference to the choice of observables is also discussed. |
0801.2680 | Thomas Gehrmann | A. Gehrmann-De Ridder, T. Gehrmann, E.W.N. Glover, G. Heinrich | Event shapes in $e^+e^-$ annhilation at NNLO | 6 pages, contribution to the Proceedings of RADCOR07, Florence | PoS RADCOR2007:048,2007 | null | ZU-TH 02/08, IPPP/08/02 | hep-ph | null | We report first results on the calculation of NNLO corrections to event shape
distributions in electron-positron annhilation. The corrections are sizeable
for all variables, however their magnitude is substantially different for
different observables. We observe that inclusion of the NNLO corrections yields
a considerably better agreement between theory and experimental data both in
shape and normalisation of the event shape distributions.
| [
{
"created": "Thu, 17 Jan 2008 14:05:14 GMT",
"version": "v1"
}
] | 2008-12-30 | [
[
"Ridder",
"A. Gehrmann-De",
""
],
[
"Gehrmann",
"T.",
""
],
[
"Glover",
"E. W. N.",
""
],
[
"Heinrich",
"G.",
""
]
] | We report first results on the calculation of NNLO corrections to event shape distributions in electron-positron annhilation. The corrections are sizeable for all variables, however their magnitude is substantially different for different observables. We observe that inclusion of the NNLO corrections yields a considerably better agreement between theory and experimental data both in shape and normalisation of the event shape distributions. |
1001.0221 | Brian Yencho | Vernon Barger, Wai-Yee Keung, Brian Yencho | Triple-Top Signal of New Physics at the LHC | 12 pages, 5 figures, 3 tables | Phys.Lett.B687:70-74,2010 | 10.1016/j.physletb.2010.03.001 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present leading-order (LO) cross sections for the production of three top
quarks ($tt\tb$,$t\tb\tb$) at the Large Hadron Collider (LHC). We find a total
LO cross section for triple-top production in the Standard Model of $\sigma
\approx 2 $ fb at $\sqrt{s}=14$ TeV and we give examples of two new physics
models which have a significant enhancement to this channel. In the Minimal
Supersymmetric Standard Model (MSSM), there are regions of parameter space
where the decays of gluino pairs into final states including three tops has a
cross section $\sigma \approx 41$ fb. In a leptophobic $Z'$ model featuring
right-handed couplings of the $u$-quark to the top, we find $\sigma \approx 28$
fb. With efficient identification and reconstruction of the top quarks, the
triple-top signal could potentially provide evidence for new physics at the
LHC.
| [
{
"created": "Mon, 4 Jan 2010 20:14:15 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Jun 2010 16:21:16 GMT",
"version": "v2"
},
{
"created": "Wed, 1 Dec 2010 16:38:22 GMT",
"version": "v3"
}
] | 2010-12-02 | [
[
"Barger",
"Vernon",
""
],
[
"Keung",
"Wai-Yee",
""
],
[
"Yencho",
"Brian",
""
]
] | We present leading-order (LO) cross sections for the production of three top quarks ($tt\tb$,$t\tb\tb$) at the Large Hadron Collider (LHC). We find a total LO cross section for triple-top production in the Standard Model of $\sigma \approx 2 $ fb at $\sqrt{s}=14$ TeV and we give examples of two new physics models which have a significant enhancement to this channel. In the Minimal Supersymmetric Standard Model (MSSM), there are regions of parameter space where the decays of gluino pairs into final states including three tops has a cross section $\sigma \approx 41$ fb. In a leptophobic $Z'$ model featuring right-handed couplings of the $u$-quark to the top, we find $\sigma \approx 28$ fb. With efficient identification and reconstruction of the top quarks, the triple-top signal could potentially provide evidence for new physics at the LHC. |
hep-ph/9403254 | null | S. Narison | Precise Determination of {$f_{P_{s}}/f_P$}} {\bf and Measurement of the
``Perturbative'' Pole Mass from {$f_P$}} | {{\bf \bf 9 pages, CERN-TH 7094/93 (published in Phys. Lett. B322
(1994) 247 ) | Phys.Lett.B322:247-252,1994 | 10.1016/0370-2693(94)91115-0 | null | hep-ph | null | We present a compact analytic two-loop expression of the $SU(3)_f$ breaking
effects on the ratio of the pseudoscalar decay constants $R_P \equiv
f_{P_S}/f_P$ ($P \equiv D,B $), from which, we extract the precise values :
$R_D = 1.15 \pm .04$, $R_B = 1.16 \pm .05 $, where the errors are mainly due to
the uncalculated $\alpha_s^2$-corrections. We also scan carefully the $M_c$
(resp. $M_b$) mass dependence of $f_D$ (resp. $f_B$) in view of precise
measurements of the ``perturbative'' c and b pole quark masses from the future
data of the decay constants $f_P$.
| [
{
"created": "Wed, 9 Mar 1994 18:03:11 GMT",
"version": "v1"
}
] | 2011-01-27 | [
[
"Narison",
"S.",
""
]
] | We present a compact analytic two-loop expression of the $SU(3)_f$ breaking effects on the ratio of the pseudoscalar decay constants $R_P \equiv f_{P_S}/f_P$ ($P \equiv D,B $), from which, we extract the precise values : $R_D = 1.15 \pm .04$, $R_B = 1.16 \pm .05 $, where the errors are mainly due to the uncalculated $\alpha_s^2$-corrections. We also scan carefully the $M_c$ (resp. $M_b$) mass dependence of $f_D$ (resp. $f_B$) in view of precise measurements of the ``perturbative'' c and b pole quark masses from the future data of the decay constants $f_P$. |
1703.06892 | Samuel Witte | Samuel J. Witte and Graciela B. Gelmini | Updated Constraints on the Dark Matter Interpretation of CDMS-II-Si Data | v2: Published version. Figure 7 added and text modified, conclusions
unchanged. v1: 18 pages, 6 figures | null | 10.1088/1475-7516/2017/05/026 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present an updated halo-dependent and halo-independent analysis of viable
light WIMP dark matter candidates which could account for the excess observed
in CDMS-II-Si. We include recent constraints from LUX, PandaX-II, and PICO-60,
as well as projected sensitivities for XENON1T, SuperCDMS SNOLAB, LZ, DARWIN,
DarkSide-20k, and PICO-250, on candidates with spin-independent isospin
conserving and isospin-violating interactions, and either elastic or exothermic
scattering. We show that there exist dark matter candidates which can explain
the CDMS-II-Si data and remain very marginally consistent with the null results
of all current experiments, however such models are highly tuned, making a dark
matter interpretation of CDMS-II-Si very unlikely. We find that these models
can only be ruled out in the future by an experiment comparable to LZ or
PICO-250.
| [
{
"created": "Mon, 20 Mar 2017 18:00:14 GMT",
"version": "v1"
},
{
"created": "Wed, 3 May 2017 18:00:00 GMT",
"version": "v2"
}
] | 2017-05-24 | [
[
"Witte",
"Samuel J.",
""
],
[
"Gelmini",
"Graciela B.",
""
]
] | We present an updated halo-dependent and halo-independent analysis of viable light WIMP dark matter candidates which could account for the excess observed in CDMS-II-Si. We include recent constraints from LUX, PandaX-II, and PICO-60, as well as projected sensitivities for XENON1T, SuperCDMS SNOLAB, LZ, DARWIN, DarkSide-20k, and PICO-250, on candidates with spin-independent isospin conserving and isospin-violating interactions, and either elastic or exothermic scattering. We show that there exist dark matter candidates which can explain the CDMS-II-Si data and remain very marginally consistent with the null results of all current experiments, however such models are highly tuned, making a dark matter interpretation of CDMS-II-Si very unlikely. We find that these models can only be ruled out in the future by an experiment comparable to LZ or PICO-250. |
hep-ph/9211325 | null | J. Ellis, D.V. Nanopoulos and K. Olive | Flipped Heavy Neutrinos from the Solar Neutrino Problem to Baryogenesis | 12 pages, 1 figure not included, CERN-TH.6712/92 | Phys.Lett.B300:121-127,1993 | 10.1016/0370-2693(93)90758-A | null | hep-ph astro-ph | null | We discuss baryogenesis using the flipped $SU(5)$ model for lepton mass
matrices. We show that the generalized see-saw mechanism in this model can not
only provide MSW neutrino mixing suitable for solving the solar neutrino
problem, and supply a hot dark matter candidate ($\nu_\tau$) with mass
$0(10)eV$ as indicated by recent COBE results, but can also naturally account
for the baryon asymmetry of the universe. Heavy singlet neutrino decay
generates a net lepton asymmetry which is subsequently reprocessed by
nonperturbative electroweak interactions. We evaluate the baryon asymmetry so
produced in light of the constraints that the COBE observations put on
inflationary cosmologies, finding it comfortably consistent with observation.
| [
{
"created": "Fri, 27 Nov 1992 16:38:40 GMT",
"version": "v1"
}
] | 2009-09-11 | [
[
"Ellis",
"J.",
""
],
[
"Nanopoulos",
"D. V.",
""
],
[
"Olive",
"K.",
""
]
] | We discuss baryogenesis using the flipped $SU(5)$ model for lepton mass matrices. We show that the generalized see-saw mechanism in this model can not only provide MSW neutrino mixing suitable for solving the solar neutrino problem, and supply a hot dark matter candidate ($\nu_\tau$) with mass $0(10)eV$ as indicated by recent COBE results, but can also naturally account for the baryon asymmetry of the universe. Heavy singlet neutrino decay generates a net lepton asymmetry which is subsequently reprocessed by nonperturbative electroweak interactions. We evaluate the baryon asymmetry so produced in light of the constraints that the COBE observations put on inflationary cosmologies, finding it comfortably consistent with observation. |
0709.2913 | C. A. de S. Pires | D. Cogollo, H. Diniz, C. A. de S. Pires, P. S. Rodrigues da Silva | Fermion family number and the Z-Z$^{\prime}$ mixing in the 3-3-1 model
with right-handed neutrinos | Minor modification in the conclusions, some refs added, to appear at
MPLA | Mod.Phys.Lett.A23:3405-3410,2009 | 10.1142/S0217732308027382 | null | hep-ph | null | Theoretical consistency of the 3-3-1 model with right-handed neutrinos
demands that the number of family of fermions be exactly equal to three. In
this brief report we show that such theoretical requirement results in a clean
and severe bound on the Z-Z$^{\prime}$ mixing angle: $-3,979\times
10^{-3}<\phi<1,309\times 10^{-4} {with 90% CL}$.
| [
{
"created": "Tue, 18 Sep 2007 20:06:37 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Jun 2008 13:31:58 GMT",
"version": "v2"
}
] | 2009-02-12 | [
[
"Cogollo",
"D.",
""
],
[
"Diniz",
"H.",
""
],
[
"Pires",
"C. A. de S.",
""
],
[
"da Silva",
"P. S. Rodrigues",
""
]
] | Theoretical consistency of the 3-3-1 model with right-handed neutrinos demands that the number of family of fermions be exactly equal to three. In this brief report we show that such theoretical requirement results in a clean and severe bound on the Z-Z$^{\prime}$ mixing angle: $-3,979\times 10^{-3}<\phi<1,309\times 10^{-4} {with 90% CL}$. |
2202.11186 | Manfred Kraus | Giuseppe Bevilacqua, Huan-Yu Bi, Heribertus Bayu Hartanto, Manfred
Kraus, Michele Lupattelli, Malgorzata Worek | $t\bar{t}b\bar{b}$ at the LHC: On the size of off-shell effects and
prompt $b$-jet identification | 35 pages, 8 figures, 1 table, version to appear in PRD | Phys. Rev. D 107, 014028 (2023) | 10.1103/PhysRevD.107.014028 | TTK-22-06, P3H-22-012, CAVENDISH-HEP-22/02 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate full off-shell effects in $t\bar{t}b\bar{b}$ production in the
dilepton channel at the LHC with the center-of-mass energy $\sqrt{s} = 13$ TeV.
Specifically, we compute NLO QCD corrections to the $pp \to e^+ \nu_e \mu^-
\bar{\nu}_\mu b \bar{b} b \bar{b} + X$ process and provide a prescription for
$b$-jet identification to distinguish prompt $b$ jets from $b$ jets originating
from the decay of the top quarks. As an important irreducible background to $pp
\to t\bar{t}H (H\to b\bar{b})$, $t\bar{t}$ production in association with two
prompt $b$ jets is a primary source of uncertainty in the measurement of
$t\bar{t}H (H\to b\bar{b})$. In quantifying full off-shell effects, we perform
comparisons between the state-of-the-art full off-shell computation and the
calculation in the narrow width approximation. The former includes all double-,
single- and non-resonant Feynman diagrams, interferences as well as
finite-width effects of the top quarks and $W$ gauge bosons. The latter
restricts the unstable top quarks and $W$ gauge bosons to on-shell states and
includes for the first time NLO QCD corrections to both production and decays.
We observe that full off-shell effects are subdominant compared to the scale
uncertainties for the integrated fiducial cross section and for the majority of
differential observables in the phase-space regions that we investigated.
However, for a number of observables related to beyond the Standard Model
searches, full off-shell effects are significant. Furthermore, with our $b$-jet
labelling prescription, the prompt $b$ jets and the $b$ jets from top-quark
decays can be successfully disentangled.
| [
{
"created": "Tue, 22 Feb 2022 21:42:32 GMT",
"version": "v1"
},
{
"created": "Sun, 18 Sep 2022 15:12:20 GMT",
"version": "v2"
},
{
"created": "Fri, 30 Dec 2022 15:22:14 GMT",
"version": "v3"
}
] | 2023-01-31 | [
[
"Bevilacqua",
"Giuseppe",
""
],
[
"Bi",
"Huan-Yu",
""
],
[
"Hartanto",
"Heribertus Bayu",
""
],
[
"Kraus",
"Manfred",
""
],
[
"Lupattelli",
"Michele",
""
],
[
"Worek",
"Malgorzata",
""
]
] | We investigate full off-shell effects in $t\bar{t}b\bar{b}$ production in the dilepton channel at the LHC with the center-of-mass energy $\sqrt{s} = 13$ TeV. Specifically, we compute NLO QCD corrections to the $pp \to e^+ \nu_e \mu^- \bar{\nu}_\mu b \bar{b} b \bar{b} + X$ process and provide a prescription for $b$-jet identification to distinguish prompt $b$ jets from $b$ jets originating from the decay of the top quarks. As an important irreducible background to $pp \to t\bar{t}H (H\to b\bar{b})$, $t\bar{t}$ production in association with two prompt $b$ jets is a primary source of uncertainty in the measurement of $t\bar{t}H (H\to b\bar{b})$. In quantifying full off-shell effects, we perform comparisons between the state-of-the-art full off-shell computation and the calculation in the narrow width approximation. The former includes all double-, single- and non-resonant Feynman diagrams, interferences as well as finite-width effects of the top quarks and $W$ gauge bosons. The latter restricts the unstable top quarks and $W$ gauge bosons to on-shell states and includes for the first time NLO QCD corrections to both production and decays. We observe that full off-shell effects are subdominant compared to the scale uncertainties for the integrated fiducial cross section and for the majority of differential observables in the phase-space regions that we investigated. However, for a number of observables related to beyond the Standard Model searches, full off-shell effects are significant. Furthermore, with our $b$-jet labelling prescription, the prompt $b$ jets and the $b$ jets from top-quark decays can be successfully disentangled. |
hep-ph/0003186 | Pran Nath | Achille Corsetti and Pran Nath | Gaugino Mass Nonuniversality and Dark Matter in SUGRA, Strings and D
Brane Models | Revised version, 23 pages, Latex, and 7 figures | Phys.Rev.D64:125010,2001 | 10.1103/PhysRevD.64.125010 | null | hep-ph | null | The effects of nonuniversality of gaugino masses on dark matter are examined
within supersymmetric grand unification, and in string and D brane models with
R parity invariance. In SU(5) unified models nonuniversality in the gaugino
sector can be generated via the gauge kinetic energy function which may depend
on the 24, 75 and 200 dimensional Higgs representations. We also consider
string models which allow for nonuniversality of gaugino masses and D brane
models where nonuniversality arises from embeddings of the Standard Model gauge
group on five branes and nine branes. It is found that with gaugino mass
nonuniversality the range of the LSP mass can be extended much beyond the range
allowed in the universal SUGRA case, up to about 600 GeV even without
coannihilation effects in some regions of the parameter space. The effects of
coannihilation are not considered and inclusion of these effects may further
increase the allowed neutralino mass range. Similarly with the inclusion of
gaugino mass nonuniversality, the neutralino-proton ($\chi -p$) cross-section
can increase by as much as a factor of 10 in some of regions of the parameter
space. An analysis of the uncertainties in the quark density content of the
nucleon is given and their effects on $\chi -p$ cross-section are discussed.
The predictions of our analysis including nonuniversality is compared with the
current limits from dark matter detectors and implications for future dark
matter searches are discussed.
| [
{
"created": "Fri, 17 Mar 2000 23:07:09 GMT",
"version": "v1"
},
{
"created": "Fri, 27 Jul 2001 11:36:55 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Corsetti",
"Achille",
""
],
[
"Nath",
"Pran",
""
]
] | The effects of nonuniversality of gaugino masses on dark matter are examined within supersymmetric grand unification, and in string and D brane models with R parity invariance. In SU(5) unified models nonuniversality in the gaugino sector can be generated via the gauge kinetic energy function which may depend on the 24, 75 and 200 dimensional Higgs representations. We also consider string models which allow for nonuniversality of gaugino masses and D brane models where nonuniversality arises from embeddings of the Standard Model gauge group on five branes and nine branes. It is found that with gaugino mass nonuniversality the range of the LSP mass can be extended much beyond the range allowed in the universal SUGRA case, up to about 600 GeV even without coannihilation effects in some regions of the parameter space. The effects of coannihilation are not considered and inclusion of these effects may further increase the allowed neutralino mass range. Similarly with the inclusion of gaugino mass nonuniversality, the neutralino-proton ($\chi -p$) cross-section can increase by as much as a factor of 10 in some of regions of the parameter space. An analysis of the uncertainties in the quark density content of the nucleon is given and their effects on $\chi -p$ cross-section are discussed. The predictions of our analysis including nonuniversality is compared with the current limits from dark matter detectors and implications for future dark matter searches are discussed. |
hep-ph/0010280 | Christopher Gordon | Arjun Berera (Edinburgh), Christopher Gordon (Portsmouth) | Inflationary Initial Conditions Consistent with Causality | 9 pages, 3 figures. Minor changes, matches version to appear in
Physical Review D | Phys.Rev. D63 (2001) 063505 | 10.1103/PhysRevD.63.063505 | null | hep-ph astro-ph gr-qc hep-th | null | The initial condition problem of inflation is examined from the perspective
of both spacetime embedding and scalar field dynamics. The spacetime embedding
problem is solved for arbitrary initial spatial curvature Omega, which
generalizes previous works that primarily treat the flat case Omega=1. Scalar
field dynamics that is consistent with the embedding constraints are examined,
with the additional treatment of damping effects. The effects of
inhomogeneities on the embedding problem also are considered. A category of
initial conditions are identified that are not acausal and can develop into an
inflationary regime.
| [
{
"created": "Tue, 24 Oct 2000 21:36:17 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Nov 2000 11:56:41 GMT",
"version": "v2"
},
{
"created": "Tue, 6 Feb 2001 14:55:58 GMT",
"version": "v3"
}
] | 2009-10-31 | [
[
"Berera",
"Arjun",
"",
"Edinburgh"
],
[
"Gordon",
"Christopher",
"",
"Portsmouth"
]
] | The initial condition problem of inflation is examined from the perspective of both spacetime embedding and scalar field dynamics. The spacetime embedding problem is solved for arbitrary initial spatial curvature Omega, which generalizes previous works that primarily treat the flat case Omega=1. Scalar field dynamics that is consistent with the embedding constraints are examined, with the additional treatment of damping effects. The effects of inhomogeneities on the embedding problem also are considered. A category of initial conditions are identified that are not acausal and can develop into an inflationary regime. |
1805.00013 | Johann Brehmer Mr | Johann Brehmer, Kyle Cranmer, Gilles Louppe, and Juan Pavez | Constraining Effective Field Theories with Machine Learning | See also the companion publication "A Guide to Constraining Effective
Field Theories with Machine Learning" at arXiv:1805.00020, an in-depth
analysis of machine learning techniques for LHC measurements. The code for
these studies is available at
https://github.com/johannbrehmer/higgs_inference . v2: New schematic figure
explaining the new algorithms, added references. v3, v4: Added references | Phys. Rev. Lett. 121, 111801 (2018) | 10.1103/PhysRevLett.121.111801 | null | hep-ph physics.data-an stat.ML | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present powerful new analysis techniques to constrain effective field
theories at the LHC. By leveraging the structure of particle physics processes,
we extract extra information from Monte-Carlo simulations, which can be used to
train neural network models that estimate the likelihood ratio. These methods
scale well to processes with many observables and theory parameters, do not
require any approximations of the parton shower or detector response, and can
be evaluated in microseconds. We show that they allow us to put significantly
stronger bounds on dimension-six operators than existing methods, demonstrating
their potential to improve the precision of the LHC legacy constraints.
| [
{
"created": "Mon, 30 Apr 2018 18:00:00 GMT",
"version": "v1"
},
{
"created": "Sat, 12 May 2018 18:48:30 GMT",
"version": "v2"
},
{
"created": "Fri, 1 Jun 2018 16:50:04 GMT",
"version": "v3"
},
{
"created": "Thu, 26 Jul 2018 19:00:29 GMT",
"version": "v4"
}
] | 2018-09-19 | [
[
"Brehmer",
"Johann",
""
],
[
"Cranmer",
"Kyle",
""
],
[
"Louppe",
"Gilles",
""
],
[
"Pavez",
"Juan",
""
]
] | We present powerful new analysis techniques to constrain effective field theories at the LHC. By leveraging the structure of particle physics processes, we extract extra information from Monte-Carlo simulations, which can be used to train neural network models that estimate the likelihood ratio. These methods scale well to processes with many observables and theory parameters, do not require any approximations of the parton shower or detector response, and can be evaluated in microseconds. We show that they allow us to put significantly stronger bounds on dimension-six operators than existing methods, demonstrating their potential to improve the precision of the LHC legacy constraints. |
0811.4119 | Michal Czakon | M. Czakon and A. Mitov | Inclusive Heavy Flavor Hadroproduction in NLO QCD: the Exact Analytic
Result | 26 pages, 6 figures, file containing the results in Mathematica
format attached | Nucl.Phys.B824:111-135,2010 | 10.1016/j.nuclphysb.2009.08.020 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the first exact analytic result for all partonic channels
contributing to the total cross section for the production of a pair of heavy
flavors in hadronic collisions in NLO QCD. Our calculation is an essential step
in the derivation of the top quark pair production cross section at NNLO in
QCD, which is a cornerstone of the precision LHC program. Our results uncover
the analytical structures behind observables with heavy flavors at higher
orders. They also reveal surprising and non-trivial implications for kinematics
close to partonic threshold.
| [
{
"created": "Tue, 25 Nov 2008 16:22:17 GMT",
"version": "v1"
}
] | 2009-10-06 | [
[
"Czakon",
"M.",
""
],
[
"Mitov",
"A.",
""
]
] | We present the first exact analytic result for all partonic channels contributing to the total cross section for the production of a pair of heavy flavors in hadronic collisions in NLO QCD. Our calculation is an essential step in the derivation of the top quark pair production cross section at NNLO in QCD, which is a cornerstone of the precision LHC program. Our results uncover the analytical structures behind observables with heavy flavors at higher orders. They also reveal surprising and non-trivial implications for kinematics close to partonic threshold. |
2111.14701 | Vo Van Vien | V. V. Vien | $\mathbf{B-L}$ model with $\mathbf{D_4\times Z_4\times Z_2}$ symmetry
for fermion mass hierarchies and mixings | 30 pages, 17 figures, 4 tables; the lepton sector is added | Chinese Phys. C 48 (2024) 063102 | 10.1088/1674-1137/ad2f23 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct a gauge $B-L$ model with $D_4\times Z_4\times Z_2$ symmetry that
can explain the quark and lepton mass hierarchies and their mixings with the
realistic CP phases via the type-I seesaw mechanism. Six quark mases, three
quark mixing angles and CP phase in the quark sector can get the central values
and Yukawa couplings in the quark sector are diluted a range of three orders of
magnitude difference by the perturbation theory at the first order. For
neutrino sector, the smallness of neutrino mass is achieved by the Type-I
seesaw mechanism. Both inverted and normal neutrino mass hierarchies are in
consistent with the experimental data. The prediction for the sum of neutrino
masses for normal and inverted hierarchies, the effective neutrino masses and
the Dirac CP phase are well consistent with all the recent limits.
| [
{
"created": "Mon, 29 Nov 2021 17:00:27 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Feb 2022 08:59:45 GMT",
"version": "v2"
},
{
"created": "Sat, 17 Dec 2022 10:25:33 GMT",
"version": "v3"
},
{
"created": "Wed, 1 May 2024 02:50:54 GMT",
"version": "v4"
}
] | 2024-05-02 | [
[
"Vien",
"V. V.",
""
]
] | We construct a gauge $B-L$ model with $D_4\times Z_4\times Z_2$ symmetry that can explain the quark and lepton mass hierarchies and their mixings with the realistic CP phases via the type-I seesaw mechanism. Six quark mases, three quark mixing angles and CP phase in the quark sector can get the central values and Yukawa couplings in the quark sector are diluted a range of three orders of magnitude difference by the perturbation theory at the first order. For neutrino sector, the smallness of neutrino mass is achieved by the Type-I seesaw mechanism. Both inverted and normal neutrino mass hierarchies are in consistent with the experimental data. The prediction for the sum of neutrino masses for normal and inverted hierarchies, the effective neutrino masses and the Dirac CP phase are well consistent with all the recent limits. |
hep-ph/9907284 | null | Giancarlo D'Ambrosio | Rare kaon decays | 7 pages LaTeX, Talk given at La Thuile Conference, 28th February- 7th
March '99. Erratum in References corrected | null | null | INFN-NA-IV 24/99 | hep-ph | null | We review some recent theoretical results on rare kaon decays. Particular
attention is devoted to establish the short distance (direct CP violating)
contribution to K_L => \pi^0 e \bar{e}. This is achieved by a careful study of
the long distance part. As byproduct, we discuss interesting chiral tests.
| [
{
"created": "Fri, 9 Jul 1999 10:43:51 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Jul 1999 16:52:55 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"D'Ambrosio",
"Giancarlo",
""
]
] | We review some recent theoretical results on rare kaon decays. Particular attention is devoted to establish the short distance (direct CP violating) contribution to K_L => \pi^0 e \bar{e}. This is achieved by a careful study of the long distance part. As byproduct, we discuss interesting chiral tests. |
hep-ph/9904211 | Smirnov Alexei | Gia Dvali and Alexei Yu. Smirnov | Probing Large Extra Dimensions with Neutrinos | LaTeX, 23 pages and 1 figure, slight revision of the manuscript, new
discussion added, several formulas corrected | Nucl.Phys. B563 (1999) 63-81 | 10.1016/S0550-3213(99)00574-X | NYU-TH/99/3/03, IC/99/32 | hep-ph | null | We study implications of theories with sub-millimeter extra dimensions and
$M_f \sim (1 - 10) $ TeV scale quantum gravity for neutrino physics. In these
theories, the left-handed neutrinos as well as other standard model (SM)
particles, are localized on a brane embedded in the bulk of large extra space.
Mixing of neutrinos with (SM) singlet fermions propagating in the bulk is
naturally suppressed by the volume factor $M_f/M_P \sim 3\cdot 10^{-16} -
3\cdot 10^{-15}$, where $M_P$ is the Planck mass. Properties of the neutrino
oscillations and the resonance conversion to the bulk fermions are considered.
We show that the resonance conversion of the electron neutrinos to the light
bulk fermions can solve the solar neutrino problem. The signature of the
solution is the peculiar distortion of the solar neutrino spectrum. The
solution implies that the radius of at least one extra dimension should be in
the range 0.06 - 0.1 mm {\it irrespective} of total number of extra dimensions.
The corresponding modification of the Newtonian law is within the range of
sensitivity of proposed sub-millimeter experiments, thus providing a verifiable
link between neutrino physics and the gravity measurements.
| [
{
"created": "Thu, 1 Apr 1999 20:46:25 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Jun 1999 18:45:38 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Dvali",
"Gia",
""
],
[
"Smirnov",
"Alexei Yu.",
""
]
] | We study implications of theories with sub-millimeter extra dimensions and $M_f \sim (1 - 10) $ TeV scale quantum gravity for neutrino physics. In these theories, the left-handed neutrinos as well as other standard model (SM) particles, are localized on a brane embedded in the bulk of large extra space. Mixing of neutrinos with (SM) singlet fermions propagating in the bulk is naturally suppressed by the volume factor $M_f/M_P \sim 3\cdot 10^{-16} - 3\cdot 10^{-15}$, where $M_P$ is the Planck mass. Properties of the neutrino oscillations and the resonance conversion to the bulk fermions are considered. We show that the resonance conversion of the electron neutrinos to the light bulk fermions can solve the solar neutrino problem. The signature of the solution is the peculiar distortion of the solar neutrino spectrum. The solution implies that the radius of at least one extra dimension should be in the range 0.06 - 0.1 mm {\it irrespective} of total number of extra dimensions. The corresponding modification of the Newtonian law is within the range of sensitivity of proposed sub-millimeter experiments, thus providing a verifiable link between neutrino physics and the gravity measurements. |
0909.4181 | Carlos E. Yaguna | Carlos E. Yaguna | Gamma ray lines: what will they tell us about SUSY? | 19 pages, 10 figures | Phys.Rev.D80:115002,2009 | 10.1103/PhysRevD.80.115002 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Neutralino dark matter can be indirectly detected by observing the gamma ray
lines from the annihilation processes XX-->gg and XX-->gZ. In this paper we
study the implications that the observation of these two lines could have for
the determination of the supersymmetric parameter space. Within the minimal
supergravity framework, we find that, independently of the dark matter
distribution in the Galaxy, such observations by themselves would allow to
differentiate between the coannihilation region, the funnel region, and the
focus point region. As a result, several restrictions on the msugra parameters
can be derived. Within a more general MSSM scenario, we show that the
observation of gamma-ray lines might be used to discriminate between a bino-, a
wino-, and a higgsino-like neutralino, with important consequences for
cosmology and for models of supersymmetry breaking. The detection of the gamma
ray lines, therefore, will not only provide an unmistakable signature of dark
matter, it will also open a new road toward the determination of supersymmetric
parameters.
| [
{
"created": "Wed, 23 Sep 2009 11:10:27 GMT",
"version": "v1"
}
] | 2010-01-08 | [
[
"Yaguna",
"Carlos E.",
""
]
] | Neutralino dark matter can be indirectly detected by observing the gamma ray lines from the annihilation processes XX-->gg and XX-->gZ. In this paper we study the implications that the observation of these two lines could have for the determination of the supersymmetric parameter space. Within the minimal supergravity framework, we find that, independently of the dark matter distribution in the Galaxy, such observations by themselves would allow to differentiate between the coannihilation region, the funnel region, and the focus point region. As a result, several restrictions on the msugra parameters can be derived. Within a more general MSSM scenario, we show that the observation of gamma-ray lines might be used to discriminate between a bino-, a wino-, and a higgsino-like neutralino, with important consequences for cosmology and for models of supersymmetry breaking. The detection of the gamma ray lines, therefore, will not only provide an unmistakable signature of dark matter, it will also open a new road toward the determination of supersymmetric parameters. |
1402.6668 | Maria Angeles Hernandez-Ruiz | Maria A. Hernandez-Ruiz | The baryon axial current in large $N_c$ chiral perturbation theory | Ph.D. Thesis, IF-UASLP, December 2012, 109 pages, fully in Spanish | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this thesis we calculate the baryon axial current within the combined
framework of the $1/N_c$ expansion and chiral perturbation theory, where $N_c$
is the number of colors. This calculation shall consider Feynman diagrams to
order of one-loop, octet and decuplet intermediaries states. We obtain
corrections due to one-loop and perturbative SU(3) symmetry breaking. The first
corrections come from Feynman diagrams, then talk about a broken chiral
symmetry in the implicit limit $m_q \rightarrow 0$, where $m_q$ is the quark
mass and the second corrections are obtained by ignoring isospin breaking and
in that case the SU(3) symmetry breaking a first-order perturbation is
included, leading an explicit break symmetry. The matrix elements of the
spatial components of the axial operator between the states of the spin flavor
symmetry, give the typical values of the axial vector coupling. For the baryon
octet, links axial vector are $g_A$, just as they are defined in experiments of
baryon semileptonic decays, where $g_A \approx 1.27$ for neutron beta decay. In
strong decays of the baryon axial vector couplings are $g$, which are extracted
from the widths of the strong decays of baryon decuplet to octet of baryons and
pions. The calculation of this work allows us to make various settings by
minimum squares, i.e., adjusting our analytical expressions with data pilot can
make the comparison between theory and experiment. We found the comparison of
our theoretical results with the experiment are in total agreement.
| [
{
"created": "Wed, 26 Feb 2014 20:18:41 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Nov 2015 00:27:35 GMT",
"version": "v2"
}
] | 2015-11-18 | [
[
"Hernandez-Ruiz",
"Maria A.",
""
]
] | In this thesis we calculate the baryon axial current within the combined framework of the $1/N_c$ expansion and chiral perturbation theory, where $N_c$ is the number of colors. This calculation shall consider Feynman diagrams to order of one-loop, octet and decuplet intermediaries states. We obtain corrections due to one-loop and perturbative SU(3) symmetry breaking. The first corrections come from Feynman diagrams, then talk about a broken chiral symmetry in the implicit limit $m_q \rightarrow 0$, where $m_q$ is the quark mass and the second corrections are obtained by ignoring isospin breaking and in that case the SU(3) symmetry breaking a first-order perturbation is included, leading an explicit break symmetry. The matrix elements of the spatial components of the axial operator between the states of the spin flavor symmetry, give the typical values of the axial vector coupling. For the baryon octet, links axial vector are $g_A$, just as they are defined in experiments of baryon semileptonic decays, where $g_A \approx 1.27$ for neutron beta decay. In strong decays of the baryon axial vector couplings are $g$, which are extracted from the widths of the strong decays of baryon decuplet to octet of baryons and pions. The calculation of this work allows us to make various settings by minimum squares, i.e., adjusting our analytical expressions with data pilot can make the comparison between theory and experiment. We found the comparison of our theoretical results with the experiment are in total agreement. |
hep-ph/0108167 | Ernest Ma | Rathin Adhikari (Jadavpur U and Calcutta U, Kolkata), Ernest Ma (UC
Riverside), and G. Rajasekaran (IMSC, Chennai) | Supersymmetric Model of Muon Anomalous Magnetic Moment and Neutrino
Masses | 10 pages, including 2 figures | Phys.Rev. D65 (2002) 077703 | 10.1103/PhysRevD.65.077703 | UCRHEP-T313 (Aug 2001) | hep-ph | null | We propose the novel lepton-number relationship $L_\tau = L_e + L_\mu$, which
is uniquely realized by the interaction $(\hat \nu_e \hat \mu - \hat e \hat
\nu_\mu) \hat \tau^c$ in supersymmetry and may account for a possibly large
muon anomalous magnetic moment. Neutrino masses (with bimaximal mixing) may be
generated from the spontaneous and soft breaking of this lepton symmetry.
| [
{
"created": "Tue, 21 Aug 2001 18:36:38 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Adhikari",
"Rathin",
"",
"Jadavpur U and Calcutta U, Kolkata"
],
[
"Ma",
"Ernest",
"",
"UC\n Riverside"
],
[
"Rajasekaran",
"G.",
"",
"IMSC, Chennai"
]
] | We propose the novel lepton-number relationship $L_\tau = L_e + L_\mu$, which is uniquely realized by the interaction $(\hat \nu_e \hat \mu - \hat e \hat \nu_\mu) \hat \tau^c$ in supersymmetry and may account for a possibly large muon anomalous magnetic moment. Neutrino masses (with bimaximal mixing) may be generated from the spontaneous and soft breaking of this lepton symmetry. |
hep-ph/0608347 | Alessandro Strumia | Alessandro Strumia | Baryogenesis via leptogenesis | 20 pages. Lectures given at LesHouches 2005 + some original material
about "flavored leptogenesis" and "DM/leptogenesis unification" | null | null | null | hep-ph | null | We discuss how leptogenesis can explain the observed baryon asymmetry and
summarize attempts of testing leptogenesis. We first perform estimates and
discuss the main physics, and later outline the techniques that allow to
perform precise computations.
| [
{
"created": "Thu, 31 Aug 2006 18:54:57 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Strumia",
"Alessandro",
""
]
] | We discuss how leptogenesis can explain the observed baryon asymmetry and summarize attempts of testing leptogenesis. We first perform estimates and discuss the main physics, and later outline the techniques that allow to perform precise computations. |
2011.01061 | Ying Li | Xue Leng, Xiao-Long Mu, Zhi-Tian Zou, Ying Li | Investigation of Effects of New Physics in $c\to (s,d)\ell^+\nu_\ell$
Transitions | 28 Pages,9 figures | null | 10.1088/1674-1137/abf489 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent anomalies in decays induced by $b\to c \ell^- \bar\nu_\ell$
transitions raise the question about such phenomena in the $D$ decays induced
by $c\to (s,d)\ell^+\nu_\ell$ transitions. In the experimental side, current
measurements on the pure leptonic and semileptonic $D$ decays agree with the
standard model predictions, such agreements can be used to constrain the new
physics (NP) contributions. In this work, we extend the standard model by
assuming general effective Hamiltonians describing the $c\to
(s,d)\ell^+\nu_\ell$ transitions including the full set of the four-fermion
operators. Within the latest experimental data, we perform a minimum $\chi^2$
fit of the Wilson coefficient corresponding to each operator. The results show
that the Wilson coefficients of scalar operators in muon sector are at the
order of ${\cal O}(10^{-2})$, and others are at the order of ${\cal
O}(10^{-3})$. The lepton flavor universality could be violated by the scalar
operators. We also calculate the branching fractions, the forward-backward
asymmetries and polarizations of final vector mesons and leptons with the
fitted Wilson coefficients of scalar and tensor operators. It is found that the
pure leptonic decays are very sensitive to the scalar operators. The effects of
NP on the semileptonic decays with electron are negligible, while for the
semileptonic decays with muon the effects of scalar operators will show up in
the forward-backward asymmetries and polarizations of muon of $D \to P\mu^+
\nu_\mu$. The future measurements in BESIII and Belle II experiments will help
us to test effects of NP and to further test new physics models.
| [
{
"created": "Mon, 2 Nov 2020 15:42:46 GMT",
"version": "v1"
}
] | 2021-07-07 | [
[
"Leng",
"Xue",
""
],
[
"Mu",
"Xiao-Long",
""
],
[
"Zou",
"Zhi-Tian",
""
],
[
"Li",
"Ying",
""
]
] | Recent anomalies in decays induced by $b\to c \ell^- \bar\nu_\ell$ transitions raise the question about such phenomena in the $D$ decays induced by $c\to (s,d)\ell^+\nu_\ell$ transitions. In the experimental side, current measurements on the pure leptonic and semileptonic $D$ decays agree with the standard model predictions, such agreements can be used to constrain the new physics (NP) contributions. In this work, we extend the standard model by assuming general effective Hamiltonians describing the $c\to (s,d)\ell^+\nu_\ell$ transitions including the full set of the four-fermion operators. Within the latest experimental data, we perform a minimum $\chi^2$ fit of the Wilson coefficient corresponding to each operator. The results show that the Wilson coefficients of scalar operators in muon sector are at the order of ${\cal O}(10^{-2})$, and others are at the order of ${\cal O}(10^{-3})$. The lepton flavor universality could be violated by the scalar operators. We also calculate the branching fractions, the forward-backward asymmetries and polarizations of final vector mesons and leptons with the fitted Wilson coefficients of scalar and tensor operators. It is found that the pure leptonic decays are very sensitive to the scalar operators. The effects of NP on the semileptonic decays with electron are negligible, while for the semileptonic decays with muon the effects of scalar operators will show up in the forward-backward asymmetries and polarizations of muon of $D \to P\mu^+ \nu_\mu$. The future measurements in BESIII and Belle II experiments will help us to test effects of NP and to further test new physics models. |
1708.07138 | Matthias Steinhauser | Peter Marquard, Alexander V. Smirnov, Vladimir A. Smirnov, Matthias
Steinhauser, David Wellmann | $(g-2)_\mu$ at four loops in QED | 6 pages, Contribution to the proceedings of the International
workshop on e+e- collisions from Phi to Psi 2017, v2: references added | null | null | DESY 17-125, TTP17-035 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review the four-loop QED corrections to the anomalous magnetic moment of
the muon. The fermionic contributions with closed electron and tau
contributions are discussed. Furthermore, we report on a new independent
calculation of the universal four-loop contribution and compare with existing
results.
| [
{
"created": "Wed, 23 Aug 2017 18:06:44 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Sep 2017 10:45:34 GMT",
"version": "v2"
}
] | 2017-09-21 | [
[
"Marquard",
"Peter",
""
],
[
"Smirnov",
"Alexander V.",
""
],
[
"Smirnov",
"Vladimir A.",
""
],
[
"Steinhauser",
"Matthias",
""
],
[
"Wellmann",
"David",
""
]
] | We review the four-loop QED corrections to the anomalous magnetic moment of the muon. The fermionic contributions with closed electron and tau contributions are discussed. Furthermore, we report on a new independent calculation of the universal four-loop contribution and compare with existing results. |
hep-ph/9409310 | null | Enrico Nardi, Esteban Roulet and Daniele Tommasini | New Neutral Gauge Bosons and New Heavy Fermions in the Light of the New
LEP Data | 12 pages (including two tables), revised version, accepted for
publication in Phys. Lett. B. Includes a discussion of the m_t and alpha_s
dependence of the bounds on the Z' mass and the fermion mixings | Phys.Lett.B344:225-232,1995 | 10.1016/0370-2693(95)91542-M | CERN-TH.7443/94, UM-TH-94-34 | hep-ph | null | We derive limits on a class of new physics effects that are naturally present
in grand unified theories based on extended gauge groups, and in particular in
$E_6$ and $SO(10)$ models. We concentrate on $i$) the effects of the mixing of
new neutral gauge bosons with the standard $Z_0$; $ii$) the effects of a mixing
of the known fermions with new heavy states. We perform a global analysis
including all the LEP data on the $Z$ decay widths and asymmetries collected
until 1993, the SLC measurement of the left--right asymmetry, the measurement
of the $W$ boson mass, various charged current constraints, and the low energy
neutral current experiments. We use a top mass value in the range announced by
CDF. We derive limits on the $Z_0$--$Z_1$ mixing, which are always $\lsim 0.01$
and are at the level of a few {\it per mille} if some specific model is
assumed. Model-dependent theoretical relations between the mixing and the mass
of the new gauge boson in most cases require $M_{Z'} > 1\,$TeV. Limits on
light--heavy fermion mixings are also largely improved with respect to previous
analyses, and are particularly relevant for a class of models that we discuss.
| [
{
"created": "Wed, 14 Sep 1994 12:22:12 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Dec 1994 16:25:01 GMT",
"version": "v2"
}
] | 2010-11-01 | [
[
"Nardi",
"Enrico",
""
],
[
"Roulet",
"Esteban",
""
],
[
"Tommasini",
"Daniele",
""
]
] | We derive limits on a class of new physics effects that are naturally present in grand unified theories based on extended gauge groups, and in particular in $E_6$ and $SO(10)$ models. We concentrate on $i$) the effects of the mixing of new neutral gauge bosons with the standard $Z_0$; $ii$) the effects of a mixing of the known fermions with new heavy states. We perform a global analysis including all the LEP data on the $Z$ decay widths and asymmetries collected until 1993, the SLC measurement of the left--right asymmetry, the measurement of the $W$ boson mass, various charged current constraints, and the low energy neutral current experiments. We use a top mass value in the range announced by CDF. We derive limits on the $Z_0$--$Z_1$ mixing, which are always $\lsim 0.01$ and are at the level of a few {\it per mille} if some specific model is assumed. Model-dependent theoretical relations between the mixing and the mass of the new gauge boson in most cases require $M_{Z'} > 1\,$TeV. Limits on light--heavy fermion mixings are also largely improved with respect to previous analyses, and are particularly relevant for a class of models that we discuss. |
hep-ph/9910499 | Nemanja Kaloper | Nemanja Kaloper, Andrew R. Liddle | Dynamics and perturbations in assisted chaotic inflation | 10 pages, revtex, 2 figures | Phys.Rev. D61 (2000) 123513 | 10.1103/PhysRevD.61.123513 | SU-ITP-99/45 | hep-ph astro-ph gr-qc hep-th | null | On compactification from higher dimensions, a single free massive scalar
field gives rise to a set of effective four-dimensional scalar fields, each
with a different mass. These can cooperate to drive a period of inflation known
as assisted inflation. We analyze the dynamics of the simplest implementation
of this idea, paying particular attention to the decoupling of fields from the
slow-roll regime as inflation proceeds. Unlike normal models of inflation, the
dynamics does not become independent of the initial conditions at late times.
In particular, we estimate the density perturbations obtained, which retain a
memory of the initial conditions even though a homogeneous, spatially-flat
Universe is generated.
| [
{
"created": "Wed, 27 Oct 1999 01:27:02 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Kaloper",
"Nemanja",
""
],
[
"Liddle",
"Andrew R.",
""
]
] | On compactification from higher dimensions, a single free massive scalar field gives rise to a set of effective four-dimensional scalar fields, each with a different mass. These can cooperate to drive a period of inflation known as assisted inflation. We analyze the dynamics of the simplest implementation of this idea, paying particular attention to the decoupling of fields from the slow-roll regime as inflation proceeds. Unlike normal models of inflation, the dynamics does not become independent of the initial conditions at late times. In particular, we estimate the density perturbations obtained, which retain a memory of the initial conditions even though a homogeneous, spatially-flat Universe is generated. |
hep-ph/9405380 | Geert Jan van Oldenborgh | Jochem Fleischer, Fred Jegerlehner, Karol Kolodziej, Geert Jan van
Oldenborgh | EEWW: a generator for $e^+e^- \to W^+W^-$ including one-loop and leading
photonic two-loop corrections | 13 pages latex with 2 figures ps; also available as
http://pss058.psi.ch/preprints/eewwmc.ps; PSI-PR-94-16 (added two references) | Comput.Phys.Commun. 85 (1995) 29-39 | 10.1016/0010-4655(94)00113-G | null | hep-ph | null | We describe a generator for the process $e^+e^- \to W^+W^-$ including all
one-loop and leading log photonic two-loop contributions. It includes
polarization of the beam and $W$ bosons, and the possibility to study the
effect of anomalous couplings.
| [
{
"created": "Wed, 25 May 1994 14:23:06 GMT",
"version": "v1"
},
{
"created": "Mon, 30 May 1994 17:19:00 GMT",
"version": "v2"
}
] | 2009-10-28 | [
[
"Fleischer",
"Jochem",
""
],
[
"Jegerlehner",
"Fred",
""
],
[
"Kolodziej",
"Karol",
""
],
[
"van Oldenborgh",
"Geert Jan",
""
]
] | We describe a generator for the process $e^+e^- \to W^+W^-$ including all one-loop and leading log photonic two-loop contributions. It includes polarization of the beam and $W$ bosons, and the possibility to study the effect of anomalous couplings. |
0705.1505 | C\'edric Lorc\'e | Lorce Cedric | Theta+ width estimation with nonzero momentum transfer | 5 pages | null | null | null | hep-ph | null | We have used the light-cone formulation of Chiral-Quark Soliton Model to
estimate the width of the lightest pentaquark Theta+. We have found that the
effect of nonzero momentum transfer is important and reduces drastically the
width to about 0.43 MeV. This means that this effect is a piece of the small
width puzzle of exotic baryons.
| [
{
"created": "Thu, 10 May 2007 16:22:24 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Cedric",
"Lorce",
""
]
] | We have used the light-cone formulation of Chiral-Quark Soliton Model to estimate the width of the lightest pentaquark Theta+. We have found that the effect of nonzero momentum transfer is important and reduces drastically the width to about 0.43 MeV. This means that this effect is a piece of the small width puzzle of exotic baryons. |
hep-ph/9402218 | Michael Earnshaw | Michael A. Earnshaw, Warren B. Perkins | Stability of an electroweak string with a fermion condensate | 13 pages, preprint DAMTP 94-9, SWAT/23 | Phys.Lett. B328 (1994) 337-345 | 10.1016/0370-2693(94)91488-5 | null | hep-ph | null | A solution of the standard electroweak theory with a single lepton family is
constructed, consisting of a cosmic string and a fermion condensate within its
core. The stability of this system to small perturbations is examined, and it
is found that stability is not enhanced relative to the bare electroweak
string. The presence of quark zero modes is shown to violate the existence
criteria for embedded defects.
| [
{
"created": "Thu, 3 Feb 1994 12:43:10 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Earnshaw",
"Michael A.",
""
],
[
"Perkins",
"Warren B.",
""
]
] | A solution of the standard electroweak theory with a single lepton family is constructed, consisting of a cosmic string and a fermion condensate within its core. The stability of this system to small perturbations is examined, and it is found that stability is not enhanced relative to the bare electroweak string. The presence of quark zero modes is shown to violate the existence criteria for embedded defects. |
1205.5887 | Krzysztof A. Meissner | Adam Latosinski, Krzysztof A. Meissner and Hermann Nicolai | (B-L) Symmetry vs. Neutrino Seesaw | 13 pages, 1 figure, with additional explanations and clarifications | null | 10.1140/epjc/s10052-013-2336-7 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute the effective coupling of the Majoron to W bosons at $\cO(\hbar)$
by evaluating the matrix element of the (B-L) current between the vacuum and a
$W^+W^-$ state. The (B-L) anomaly vanishes, but the amplitude does not vanish
as a result of a UV finite and non-local contribution which is entirely due to
the mixing between left-chiral and right-chiral neutrinos. The result shows how
anomaly-like couplings may arise in spite of the fact that the (B-L) current
remains exactly conserved to all orders in $\hbar$, lending additional support
to our previous proposal to identify the Majoron with the axion.
| [
{
"created": "Sat, 26 May 2012 14:59:09 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Oct 2012 07:53:16 GMT",
"version": "v2"
}
] | 2015-06-05 | [
[
"Latosinski",
"Adam",
""
],
[
"Meissner",
"Krzysztof A.",
""
],
[
"Nicolai",
"Hermann",
""
]
] | We compute the effective coupling of the Majoron to W bosons at $\cO(\hbar)$ by evaluating the matrix element of the (B-L) current between the vacuum and a $W^+W^-$ state. The (B-L) anomaly vanishes, but the amplitude does not vanish as a result of a UV finite and non-local contribution which is entirely due to the mixing between left-chiral and right-chiral neutrinos. The result shows how anomaly-like couplings may arise in spite of the fact that the (B-L) current remains exactly conserved to all orders in $\hbar$, lending additional support to our previous proposal to identify the Majoron with the axion. |
hep-ph/9303252 | null | H. Lew | A Shadow Matter Universe | 11 pages (LaTeX), PURD-TH-93-04 | null | null | null | hep-ph | null | The cosmological and astrophysical implications of a shadow matter model
which could also have interesting experimental consequences are examined. The
model has identical microphysics for both the ordinary and shadow worlds but
requires a macroscopic asymmetry from nucleosynthesis constraints. It is
proposed that this macroscopic asymmetry can be generated at the quark-hadron
phase transition.
| [
{
"created": "Fri, 12 Mar 1993 20:17:14 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Lew",
"H.",
""
]
] | The cosmological and astrophysical implications of a shadow matter model which could also have interesting experimental consequences are examined. The model has identical microphysics for both the ordinary and shadow worlds but requires a macroscopic asymmetry from nucleosynthesis constraints. It is proposed that this macroscopic asymmetry can be generated at the quark-hadron phase transition. |
2407.03480 | Rudnei Ramos | Everlyn Martins, Y. M. P. Gomes, Marcus Benghi Pinto and Rudnei O.
Ramos | Testing the equivalence between the planar Gross-Neveu and Thirring
models at $N=1$ | 13 pages, 7 figures | null | null | null | hep-ph cond-mat.other hep-th | http://creativecommons.org/licenses/by/4.0/ | It is known that the Fierz identities predict that the Gross-Neveu and
Thirring models should be equivalent when describing systems composed of a
single fermionic flavor, $N=1$. Here, we consider the planar version of both
models within the framework of the optimized perturbation theory at the two
loop level, in order to verify if the predicted equivalence emerges explicitly
when different temperature and density regimes are considered. At vanishing
densities, our results indicate that both models indeed describe exactly the
same thermodynamics, provided that $N=1$. However, at finite chemical
potentials we find that the $N=1$ Fierz equivalence no longer holds. After
examining the relevant free energies, we have identified the contributions
which lead to this puzzling discrepancy. Finally, we discuss different
frameworks in which this (so far open) problem could be further understood and
eventually circumvented.
| [
{
"created": "Wed, 3 Jul 2024 19:58:37 GMT",
"version": "v1"
}
] | 2024-07-08 | [
[
"Martins",
"Everlyn",
""
],
[
"Gomes",
"Y. M. P.",
""
],
[
"Pinto",
"Marcus Benghi",
""
],
[
"Ramos",
"Rudnei O.",
""
]
] | It is known that the Fierz identities predict that the Gross-Neveu and Thirring models should be equivalent when describing systems composed of a single fermionic flavor, $N=1$. Here, we consider the planar version of both models within the framework of the optimized perturbation theory at the two loop level, in order to verify if the predicted equivalence emerges explicitly when different temperature and density regimes are considered. At vanishing densities, our results indicate that both models indeed describe exactly the same thermodynamics, provided that $N=1$. However, at finite chemical potentials we find that the $N=1$ Fierz equivalence no longer holds. After examining the relevant free energies, we have identified the contributions which lead to this puzzling discrepancy. Finally, we discuss different frameworks in which this (so far open) problem could be further understood and eventually circumvented. |
1907.01476 | Mikhail Voloshin | M.B. Voloshin | Some decay properties of hidden-charm pentaquarks as baryon-meson
molecules | 8 pages, 1 figure | Phys. Rev. D 100, 034020 (2019) | 10.1103/PhysRevD.100.034020 | FTPI-MINN-19/19, UMN-TH-3828/19 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is pointed out that the previously suggested interpretation of the
hidden-charm pentaquarks $P_c(4312)$, $P_c(4440)$ and $P_c(4457)$ as molecular
bound states of $\Sigma_c \bar D$ and $\Sigma_c \bar D^*$ baryon-meson pairs
gives rise to specific relations for their decays. In particular, the heavy
quark spin symmetry predicts ratios of rates of decays of each of the molecules
to $J/\psi p$ and to $\eta_c p$ as well as of the decays to $\Lambda_c \bar D$
and to $\Lambda_c \bar D^*$. Experimental studies of these relations would thus
provide an indicative probe of the molecular structure.
| [
{
"created": "Tue, 2 Jul 2019 16:16:29 GMT",
"version": "v1"
}
] | 2019-08-28 | [
[
"Voloshin",
"M. B.",
""
]
] | It is pointed out that the previously suggested interpretation of the hidden-charm pentaquarks $P_c(4312)$, $P_c(4440)$ and $P_c(4457)$ as molecular bound states of $\Sigma_c \bar D$ and $\Sigma_c \bar D^*$ baryon-meson pairs gives rise to specific relations for their decays. In particular, the heavy quark spin symmetry predicts ratios of rates of decays of each of the molecules to $J/\psi p$ and to $\eta_c p$ as well as of the decays to $\Lambda_c \bar D$ and to $\Lambda_c \bar D^*$. Experimental studies of these relations would thus provide an indicative probe of the molecular structure. |
1906.11835 | Lu\'is Ventura | Jo\~ao G. Rosa, Lu\'is B. Ventura | Warm Little Inflaton becomes Dark Energy | 6 pages, 3 figures, added references and comments. Comments are
welcome | null | 10.1016/j.physletb.2019.134984 | null | hep-ph astro-ph.CO gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a model where the inflaton field behaves like quintessence at late
times, generating the present phase of accelerated expansion. This is achieved
within the framework of warm inflation, in particular the Warm Little Inflaton
scenario, where the underlying symmetries guarantee a successful inflationary
period in a warm regime sustained by dissipative effects without significant
backreaction on the scalar potential. This yields a smooth transition into a
radiation-dominated epoch, at which point dissipative effects naturally shut
down as the temperature drops below the mass of the fermions directly coupled
to the inflaton. The post-inflationary dynamics is then analogous to a thawing
quintessence scenario, with no kination phase at the end of inflation.
Observational signatures of this scenario include the modified consistency
relation between the tensor-to-scalar ratio and tensor spectral index typical
of warm inflation models, the variation of the dark energy equation of state at
low redshifts characteristic of thawing quintessence scenarios, and correlated
dark energy isocurvature perturbations.
| [
{
"created": "Thu, 27 Jun 2019 18:00:00 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Jul 2019 20:58:34 GMT",
"version": "v2"
}
] | 2019-10-23 | [
[
"Rosa",
"João G.",
""
],
[
"Ventura",
"Luís B.",
""
]
] | We present a model where the inflaton field behaves like quintessence at late times, generating the present phase of accelerated expansion. This is achieved within the framework of warm inflation, in particular the Warm Little Inflaton scenario, where the underlying symmetries guarantee a successful inflationary period in a warm regime sustained by dissipative effects without significant backreaction on the scalar potential. This yields a smooth transition into a radiation-dominated epoch, at which point dissipative effects naturally shut down as the temperature drops below the mass of the fermions directly coupled to the inflaton. The post-inflationary dynamics is then analogous to a thawing quintessence scenario, with no kination phase at the end of inflation. Observational signatures of this scenario include the modified consistency relation between the tensor-to-scalar ratio and tensor spectral index typical of warm inflation models, the variation of the dark energy equation of state at low redshifts characteristic of thawing quintessence scenarios, and correlated dark energy isocurvature perturbations. |
0907.2842 | Alexander Khodjamirian | A.Khodjamirian, Ch.Klein, Th.Mannel and N.Offen | Semileptonic charm decays $D \to \pi l \nu_{\l}$ and $D \to K l \nu_l$
from QCD Light-Cone Sum Rules | 34 pages, 5 figures | null | 10.1103/PhysRevD.80.114005 | SI-HEP-2009-06, LPT-09-60 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a new calculation of the $D\to\pi$ and $D \to K$ form factors from
QCD light-cone sum rules. The $\overline{MS}$ scheme for the $c$-quark mass is
used and the input parameters are updated. The results are $f^+_{D\pi}(0)=
0.67^{+0.10}_{-0.07}$, $f^+_{DK}(0)=0.75^{+0.11}_{-0.08}$ and
$f^+_{D\pi}(0)/f^+_{DK}(0)=0.88 \pm 0.05$. Combining the calculated form
factors with the latest CLEO data, we obtain $|V_{cd}|=0.225\pm 0.005 \pm 0.003
^{+0.016}_{-0.012}$ and $|V_{cd}|/|V_{cs}|= 0.236\pm 0.006\pm 0.003\pm 0.013$
where the first and second errors are of experimental origin and the third
error is due to the estimated uncertainties of our calculation. We also
evaluate the form factors $f^-_{D\pi}$ and $f^-_{DK}$ and predict the slope
parameters at $q^2=0$. Furthermore, calculating the form factors from the sum
rules at $q^2<0$, we fit them to various parameterizations. After analytic
continuation, the shape of the $D\to \pi,K $ form factors in the whole
semileptonic region is reproduced, in a good agreement with experiment.
| [
{
"created": "Thu, 16 Jul 2009 13:51:39 GMT",
"version": "v1"
}
] | 2013-05-29 | [
[
"Khodjamirian",
"A.",
""
],
[
"Klein",
"Ch.",
""
],
[
"Mannel",
"Th.",
""
],
[
"Offen",
"N.",
""
]
] | We present a new calculation of the $D\to\pi$ and $D \to K$ form factors from QCD light-cone sum rules. The $\overline{MS}$ scheme for the $c$-quark mass is used and the input parameters are updated. The results are $f^+_{D\pi}(0)= 0.67^{+0.10}_{-0.07}$, $f^+_{DK}(0)=0.75^{+0.11}_{-0.08}$ and $f^+_{D\pi}(0)/f^+_{DK}(0)=0.88 \pm 0.05$. Combining the calculated form factors with the latest CLEO data, we obtain $|V_{cd}|=0.225\pm 0.005 \pm 0.003 ^{+0.016}_{-0.012}$ and $|V_{cd}|/|V_{cs}|= 0.236\pm 0.006\pm 0.003\pm 0.013$ where the first and second errors are of experimental origin and the third error is due to the estimated uncertainties of our calculation. We also evaluate the form factors $f^-_{D\pi}$ and $f^-_{DK}$ and predict the slope parameters at $q^2=0$. Furthermore, calculating the form factors from the sum rules at $q^2<0$, we fit them to various parameterizations. After analytic continuation, the shape of the $D\to \pi,K $ form factors in the whole semileptonic region is reproduced, in a good agreement with experiment. |
hep-ph/9808251 | Smaragda Lola | J. Ellis, G.K. Leontaris, S. Lola and D.V. Nanopoulos | Neutrino Textures in the Light of Super-Kamiokande Data and a Realistic
String Model | LaTex 37 pages, with 5 eps figures | Eur.Phys.J.C9:389-408,1999 | 10.1007/s100529900001 | ACT-7/98, CERN-TH/98-216, CTP-TAMU-25/98, IOA-10/1998 | hep-ph | null | Motivated by the Super-Kamiokande atmospheric neutrino data, we discuss
possible textures for Majorana and Dirac neutrino masses within the see-saw
framework. The main purposes of this paper are twofold: first to obtain
intuition from a purely phenomenological analysis, and secondly to explore to
what extent it may be realized in a specific model. We comment initially on the
simplified two-generation case, emphasizing that large mixing is not
incompatible with a large hierarchy of mass eigenvalues. We also emphasize that
renormalization-group effects may amplify neutrino mixing, presenting
semi-analytic expressions for estimating this amplification. Several examples
are then given of three-family neutrino mass textures which may also
accommodate the persistent solar neutrino deficit, with different assumptions
for the neutrino Dirac mass matrices. We comment on a few features of neutrino
mass textures arising in models with a U(1) flavour symmetry. Finally, we
discuss the possible pattern of neutrino masses in a `realistic' flipped SU(5)
model derived from string theory, illustrating how a desirable pattern of
mixing may emerge. Both small- or large-angle MSW solutions are possible,
whilst a hierarchy of neutrino masses appears more natural than
near-degeneracy. This model contains some unanticipated features that may also
be relevant in other models: the neutrino Dirac matrices may not be related
closely to the quark mass matrices, and the heavy Majorana states may include
extra gauge-singlet fields.
| [
{
"created": "Thu, 6 Aug 1998 16:39:59 GMT",
"version": "v1"
}
] | 2009-09-11 | [
[
"Ellis",
"J.",
""
],
[
"Leontaris",
"G. K.",
""
],
[
"Lola",
"S.",
""
],
[
"Nanopoulos",
"D. V.",
""
]
] | Motivated by the Super-Kamiokande atmospheric neutrino data, we discuss possible textures for Majorana and Dirac neutrino masses within the see-saw framework. The main purposes of this paper are twofold: first to obtain intuition from a purely phenomenological analysis, and secondly to explore to what extent it may be realized in a specific model. We comment initially on the simplified two-generation case, emphasizing that large mixing is not incompatible with a large hierarchy of mass eigenvalues. We also emphasize that renormalization-group effects may amplify neutrino mixing, presenting semi-analytic expressions for estimating this amplification. Several examples are then given of three-family neutrino mass textures which may also accommodate the persistent solar neutrino deficit, with different assumptions for the neutrino Dirac mass matrices. We comment on a few features of neutrino mass textures arising in models with a U(1) flavour symmetry. Finally, we discuss the possible pattern of neutrino masses in a `realistic' flipped SU(5) model derived from string theory, illustrating how a desirable pattern of mixing may emerge. Both small- or large-angle MSW solutions are possible, whilst a hierarchy of neutrino masses appears more natural than near-degeneracy. This model contains some unanticipated features that may also be relevant in other models: the neutrino Dirac matrices may not be related closely to the quark mass matrices, and the heavy Majorana states may include extra gauge-singlet fields. |
hep-ph/9501366 | null | Zheng Huang | Disoriented Chiral Condensate | 8 pages, Compile with LaTeX. One figure available upon request.
Presented at the Beyond Standard Model IV, 13-18 December 1994, Take Tahoe,
California | null | null | LBL-36740 | hep-ph | null | The current theoretical understanding of disoriented chiral condensate is
briefly reviewed. I discuss the basic idea, the formation mechanism and
experimental signatures of DCC in high energy collisions.
| [
{
"created": "Wed, 25 Jan 1995 01:28:02 GMT",
"version": "v1"
}
] | 2016-09-01 | [
[
"Huang",
"Zheng",
""
]
] | The current theoretical understanding of disoriented chiral condensate is briefly reviewed. I discuss the basic idea, the formation mechanism and experimental signatures of DCC in high energy collisions. |
0803.3524 | Aurore Courtoy | A. Courtoy and S. Noguera | Pion-Photon TDAs in the NJL Model | To appear in the proceedings of International School of Nuclear
Physics: 29th Course: Quarks in Hadrons and Nuclei, Erice, Sicily, Italy,
16-24 Sep 2007 | Prog.Part.Nucl.Phys.61:170-172,2008 | 10.1016/j.ppnp.2007.12.040 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The pion-photon Transition Distribution Amplitudes (TDAs) are studied,
treating the pion as a bound state in the sense of Bethe-Salpeter, in the
formalism of the NJL model. The results obtained explicitly verify support, sum
rules and polynomiality conditions. The role of PCAC is highlighted.
| [
{
"created": "Tue, 25 Mar 2008 10:53:13 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Courtoy",
"A.",
""
],
[
"Noguera",
"S.",
""
]
] | The pion-photon Transition Distribution Amplitudes (TDAs) are studied, treating the pion as a bound state in the sense of Bethe-Salpeter, in the formalism of the NJL model. The results obtained explicitly verify support, sum rules and polynomiality conditions. The role of PCAC is highlighted. |
hep-ph/0608120 | Andrei Kataev | A.L. Kataev (INR, Moscow) | Reconsidered estimates of the 10th order QED contributions to the muon
anomaly | 19 pages, LaTeX, some misprints in the text and literature corrected.
Results unchaged, to appear in Phys.Rev.D | Phys.Rev.D74:073011,2006 | 10.1103/PhysRevD.74.073011 | null | hep-ph | null | The problem of estimating the 10th order QED corrections to the muon
anomalous magnetic moment is reconsidered. The incorporation of the recently
improved contributions to the $\alpha^4$ and $\alpha^5$- corrections to
$a_{\mu}$ within the renormalization-group inspired scheme-invariant approach
leads to the estimate $a_{\mu}^{(10)}\approx 643(\alpha/pi)^5$. It is in good
agreement with the estimate $a_{\mu}^{(10)}= 663(20) (\alpha/\pi)^5$, obtained
by Kinoshita and Nio from the numerical calculations of 2958 10-th order
diagrams, which are considered to be more important than the still uncalculated
6122 10th-order $m_{\mu}/m_e$-dependent vertex graphs, and 12672 5-loop
diagrams, responsible for the mass-independent constant contribution both to
$a_{\mu}$ and $a_e$. This confirms Kinoshita and Nio guess about dominance of
the 10-th order diagrams calculated by them. Comparisons with other estimates
of the $\alpha^5$- contributions to $a_{\mu}$, which exist in the literature,
are presented.
| [
{
"created": "Thu, 10 Aug 2006 16:42:29 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Oct 2006 15:54:34 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Kataev",
"A. L.",
"",
"INR, Moscow"
]
] | The problem of estimating the 10th order QED corrections to the muon anomalous magnetic moment is reconsidered. The incorporation of the recently improved contributions to the $\alpha^4$ and $\alpha^5$- corrections to $a_{\mu}$ within the renormalization-group inspired scheme-invariant approach leads to the estimate $a_{\mu}^{(10)}\approx 643(\alpha/pi)^5$. It is in good agreement with the estimate $a_{\mu}^{(10)}= 663(20) (\alpha/\pi)^5$, obtained by Kinoshita and Nio from the numerical calculations of 2958 10-th order diagrams, which are considered to be more important than the still uncalculated 6122 10th-order $m_{\mu}/m_e$-dependent vertex graphs, and 12672 5-loop diagrams, responsible for the mass-independent constant contribution both to $a_{\mu}$ and $a_e$. This confirms Kinoshita and Nio guess about dominance of the 10-th order diagrams calculated by them. Comparisons with other estimates of the $\alpha^5$- contributions to $a_{\mu}$, which exist in the literature, are presented. |
1002.4137 | Zosia A. C. Krusberg | Maria Beltran, Dan Hooper, Edward W. Kolb, Zosia A. C. Krusberg, Tim
M. P. Tait | Maverick dark matter at colliders | 11 pages, 7 figures | JHEP 1009:037,2010 | 10.1007/JHEP09(2010)037 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Assuming that dark matter is a weakly interacting massive particle (WIMP)
species X produced in the early Universe as a cold thermal relic, we study the
collider signal of pp or ppbar -> XXbar + jets and its distinguishability from
standard-model background processes associated with jets and missing energy. We
assume that the WIMP is the sole particle related to dark matter within reach
of the LHC--a "maverick" particle--and that it couples to quarks through a
higher dimensional contact interaction. We simulate the WIMP final-state signal
XXbar + jet and dominant standard-model (SM) background processes and find that
the dark-matter production process results in higher energies for the colored
final state partons than do the standard-model background processes, resulting
in more QCD radiation and a higher jet multiplicity. As a consequence, the
detectable signature of maverick dark matter is an excess over standard-model
expectations of events consisting of large missing transverse energy, together
with large leading jet transverse momentum and scalar sum of the transverse
momenta of the jets. Existing Tevatron data and forthcoming LHC data can
constrain (or discover!) maverick dark matter.
| [
{
"created": "Mon, 22 Feb 2010 16:52:38 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Aug 2010 21:40:15 GMT",
"version": "v2"
}
] | 2010-09-21 | [
[
"Beltran",
"Maria",
""
],
[
"Hooper",
"Dan",
""
],
[
"Kolb",
"Edward W.",
""
],
[
"Krusberg",
"Zosia A. C.",
""
],
[
"Tait",
"Tim M. P.",
""
]
] | Assuming that dark matter is a weakly interacting massive particle (WIMP) species X produced in the early Universe as a cold thermal relic, we study the collider signal of pp or ppbar -> XXbar + jets and its distinguishability from standard-model background processes associated with jets and missing energy. We assume that the WIMP is the sole particle related to dark matter within reach of the LHC--a "maverick" particle--and that it couples to quarks through a higher dimensional contact interaction. We simulate the WIMP final-state signal XXbar + jet and dominant standard-model (SM) background processes and find that the dark-matter production process results in higher energies for the colored final state partons than do the standard-model background processes, resulting in more QCD radiation and a higher jet multiplicity. As a consequence, the detectable signature of maverick dark matter is an excess over standard-model expectations of events consisting of large missing transverse energy, together with large leading jet transverse momentum and scalar sum of the transverse momenta of the jets. Existing Tevatron data and forthcoming LHC data can constrain (or discover!) maverick dark matter. |
1606.01741 | Gorazd Cvetic | Cesar Ayala, Gorazd Cvetic, Antonio Pineda | Mass of the bottom quark from Upsilon(1S) at NNNLO: an update | 6 pages; presented at ACAT 2016, 18-22 January 2016, UTFSM,
Valparaiso, Chile | null | 10.1088/1742-6596/762/1/012063 | USM-TH-343 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We update our perturbative determination of MSbar bottom quark mass mb(mb),
by including the recently obtained four-loop coefficient in the relation
between the pole and MSbar mass. First the renormalon subtracted (RS or RS')
mass is determined from the known mass of the Upsilon(1S) meson, where we use
the renormalon residue Nm obtained from the asymptotic behavior of the
coefficient of the 3-loop static singlet potential. MSbar mass is then obtained
using the 4-loop renormalon-free relation between the RS (RS') and MSbar mass.
We argue that the effects of the charm quark mass are accounted for by
effectively using Nf=3 in the mass relations. The extracted value is mb(mb) =
4222(40) MeV, where the uncertainty is dominated by the renormalization scale
dependence.
| [
{
"created": "Mon, 6 Jun 2016 13:46:57 GMT",
"version": "v1"
}
] | 2016-12-21 | [
[
"Ayala",
"Cesar",
""
],
[
"Cvetic",
"Gorazd",
""
],
[
"Pineda",
"Antonio",
""
]
] | We update our perturbative determination of MSbar bottom quark mass mb(mb), by including the recently obtained four-loop coefficient in the relation between the pole and MSbar mass. First the renormalon subtracted (RS or RS') mass is determined from the known mass of the Upsilon(1S) meson, where we use the renormalon residue Nm obtained from the asymptotic behavior of the coefficient of the 3-loop static singlet potential. MSbar mass is then obtained using the 4-loop renormalon-free relation between the RS (RS') and MSbar mass. We argue that the effects of the charm quark mass are accounted for by effectively using Nf=3 in the mass relations. The extracted value is mb(mb) = 4222(40) MeV, where the uncertainty is dominated by the renormalization scale dependence. |
hep-ph/0011395 | Daniel Cormier | J. Baacke, D. Cormier, H. J. de Vega and K. Heitmann | Dynamics of O(N) chiral supersymmetry at finite energy density | 9 pages, 4 figures | Phys.Lett. B520 (2001) 317-321 | 10.1016/S0370-2693(01)01168-6 | DO-TH-00/18, SUSX-TH-00-021, LPTHE/00-46, LA-00-5852 | hep-ph | null | We consider an O(N) version of a massive, interacting, chiral supersymmetry
model solved exactly in the large N limit. We demonstrate that the system
approaches a stable attractor at high energy densities, corresponding to a
non-perturbative state for which the relevant field quanta are massless. The
state is one of spontaneously broken O(N), which, due to the influence of
supersymmetry, does not become restored at high energies. Introducing soft
supersymmetry breaking to the Lagrangian results in scalar masses at the soft
breaking scale m_s independent of the mass scale of supersymmetry mu, with even
smaller masses for the fermions.
| [
{
"created": "Thu, 30 Nov 2000 17:50:35 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Jul 2001 09:51:48 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Baacke",
"J.",
""
],
[
"Cormier",
"D.",
""
],
[
"de Vega",
"H. J.",
""
],
[
"Heitmann",
"K.",
""
]
] | We consider an O(N) version of a massive, interacting, chiral supersymmetry model solved exactly in the large N limit. We demonstrate that the system approaches a stable attractor at high energy densities, corresponding to a non-perturbative state for which the relevant field quanta are massless. The state is one of spontaneously broken O(N), which, due to the influence of supersymmetry, does not become restored at high energies. Introducing soft supersymmetry breaking to the Lagrangian results in scalar masses at the soft breaking scale m_s independent of the mass scale of supersymmetry mu, with even smaller masses for the fermions. |
hep-ph/9504388 | null | F. S. NAVARRA, M. NIELSEN, C. A. A. NUNES and M. TEIXEIRA | ON THE INTRINSIC CHARM COMPONENT OF THE NUCLEON | 9 pages, 2 figures not included, avaiable from the authors | Phys.Rev. D54 (1996) 842-846 | 10.1103/PhysRevD.54.842 | IFUSP/P-1150 | hep-ph | null | Using a $\overline D$ meson cloud model we calculate the squared charm radius
of the nucleon . The ratio between this squared radius and the ordinary baryon
squared radius is identified with the probability of ``seeing'' the intrinsic
charm component of the nucleon. Our estimate is compatible with those used to
successfully describe the charm production phenomenology.
| [
{
"created": "Mon, 24 Apr 1995 18:08:16 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"NAVARRA",
"F. S.",
""
],
[
"NIELSEN",
"M.",
""
],
[
"NUNES",
"C. A. A.",
""
],
[
"TEIXEIRA",
"M.",
""
]
] | Using a $\overline D$ meson cloud model we calculate the squared charm radius of the nucleon . The ratio between this squared radius and the ordinary baryon squared radius is identified with the probability of ``seeing'' the intrinsic charm component of the nucleon. Our estimate is compatible with those used to successfully describe the charm production phenomenology. |
1911.09551 | Junle Pei | Tianjun Li, Junle Pei, Fangzhou Xu, Wenxing Zhang | $SU(3)_C\times SU(3)_L\times U(1)_X$ model from $SU(6)$ | null | Phys. Rev. D 102, 016004 (2020) | 10.1103/PhysRevD.102.016004 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose the $SU(3)_C\times SU(3)_L\times U(1)_X$ model arising from
$SU(6)$ breaking. One family of the Standard Model (SM) fermions arises from
two $\bar{6}$ representations and one $15$ representation of $SU(6)$ gauge
symmetry. To break the $SU(3)_C\times SU(3)_L\times U(1)_X$ gauge symmetry down
to the SM, we introduce three $SU(3)_L$ triplet Higgs fields, where two of them
come from the $\bar{6}$ representation while the other one from the $15$
representation. We study the gauge boson masses and Higgs boson mass in detail,
and find that the vacuum expectation value (VEV) of the Higgs field for
$SU(3)_L\times U(1)_X$ gauge symmetry breaking is around 10 TeV. The neutrino
masses and mixing can be generated via the littlest inverse seesaw mechanism.
In particular, we have normal hierarchy for neutrino masses and the lightest
active neutrino is massless. Also, we consider constraints from the charged
lepton flavor changing decays as well. Furthermore, introducing two $SU(3)_L$
adjoint fermions, one $SU(3)_C$ adjoint scalar, and one $SU(3)_L$ triplet
scalar, we can achieve gauge coupling unification within 1\%. These extra
particles can provide a dark matter candidate as well.
| [
{
"created": "Thu, 21 Nov 2019 15:46:07 GMT",
"version": "v1"
},
{
"created": "Sun, 19 Jul 2020 10:41:57 GMT",
"version": "v2"
},
{
"created": "Fri, 20 Nov 2020 14:50:13 GMT",
"version": "v3"
}
] | 2020-11-23 | [
[
"Li",
"Tianjun",
""
],
[
"Pei",
"Junle",
""
],
[
"Xu",
"Fangzhou",
""
],
[
"Zhang",
"Wenxing",
""
]
] | We propose the $SU(3)_C\times SU(3)_L\times U(1)_X$ model arising from $SU(6)$ breaking. One family of the Standard Model (SM) fermions arises from two $\bar{6}$ representations and one $15$ representation of $SU(6)$ gauge symmetry. To break the $SU(3)_C\times SU(3)_L\times U(1)_X$ gauge symmetry down to the SM, we introduce three $SU(3)_L$ triplet Higgs fields, where two of them come from the $\bar{6}$ representation while the other one from the $15$ representation. We study the gauge boson masses and Higgs boson mass in detail, and find that the vacuum expectation value (VEV) of the Higgs field for $SU(3)_L\times U(1)_X$ gauge symmetry breaking is around 10 TeV. The neutrino masses and mixing can be generated via the littlest inverse seesaw mechanism. In particular, we have normal hierarchy for neutrino masses and the lightest active neutrino is massless. Also, we consider constraints from the charged lepton flavor changing decays as well. Furthermore, introducing two $SU(3)_L$ adjoint fermions, one $SU(3)_C$ adjoint scalar, and one $SU(3)_L$ triplet scalar, we can achieve gauge coupling unification within 1\%. These extra particles can provide a dark matter candidate as well. |
2307.10014 | Gregory Patellis | Gregory Patellis, Werner Porod and George Zoupanos | Split NMSSM from dimensional reduction of a $10D$, $\mathcal{N}=1$ $E_8$
over $SU(3)/U(1)\times U(1)\times Z_3$ | 18 pages, 3 figures | null | null | CERN-TH-2023-124 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine an extension of the Standard Model which results from a $10D$,
$\mathcal{N}=1$, $E_8$ gauge theory. The theory is dimensionally reduced over a
$M_4 \times B_0/ \mathbf{Z}_3 $ space, where $B_0$ is the nearly-K\"ahler
manifold $SU(3)/U(1) \times U(1)$ and $\mathbf{Z}_3$ is a freely acting
discrete group on $B_0$ that triggers a Wilson flux breaking, leading to an
$\mathcal{N}=1$, $SU(3)^3\times U(1)^2$ effective theory in $4D$. At lower
energies we are left with the Split NMSSM. Its 2-loop analysis yields third
generation quark and light Higgs masses within the experimental limits and
predicts a neutralino LSP mass $<800$ GeV.
| [
{
"created": "Wed, 19 Jul 2023 14:53:08 GMT",
"version": "v1"
}
] | 2023-07-20 | [
[
"Patellis",
"Gregory",
""
],
[
"Porod",
"Werner",
""
],
[
"Zoupanos",
"George",
""
]
] | We examine an extension of the Standard Model which results from a $10D$, $\mathcal{N}=1$, $E_8$ gauge theory. The theory is dimensionally reduced over a $M_4 \times B_0/ \mathbf{Z}_3 $ space, where $B_0$ is the nearly-K\"ahler manifold $SU(3)/U(1) \times U(1)$ and $\mathbf{Z}_3$ is a freely acting discrete group on $B_0$ that triggers a Wilson flux breaking, leading to an $\mathcal{N}=1$, $SU(3)^3\times U(1)^2$ effective theory in $4D$. At lower energies we are left with the Split NMSSM. Its 2-loop analysis yields third generation quark and light Higgs masses within the experimental limits and predicts a neutralino LSP mass $<800$ GeV. |
hep-ph/0007220 | Zenghui Yu | M. Chaichian (1,2), K. Huitu (1) and Z.-H. Yu (1,2) ((1) Helsinki
Institute of Physics (2) Department of Physics, University of Helsinki,
Finland) | R-parity violation in $(t+\bar t)\tilde g$ production at LHC and
Tevatron | 12 pages, 8 figures | Phys.Lett.B490:87-98,2000 | 10.1016/S0370-2693(00)00881-9 | HIP-2000-32/TH | hep-ph | null | We study the production of $(t+\bar{t}) \tilde{g}$ at the hadron colliders in
an R-parity ($R_{p}$) violating supersymmetric model. This process provides us
with information not only about $R_{p}$ violation, but may also help us in
detecting the supersymmetry itself. It is possible to detect an $R_{p}$
violating signal (with single gluino production) at the future hadron
colliders, such as Fermilab Tevatron Run II or CERN Large Hadron Collider
(LHC), if the parameters in the supersymmetric $\rlap/ R_{p}$ interactions are
not too small, e.g. for $m_{\tilde{g}}=1$ TeV, $\lambda^{''}=0.1$, still
hundreds of events are produced at LHC with luminosity $30 fb^{-1}$. Even if we
could not detect a signal of $ \rlap/R_{p}$ in the experiment, we get stringent
constraints on the heavy flavour $\rlap/R_{p}$ couplings. In addition to the
minimal supersymmetric standard model we have also considered some models with
a heavy gluino as the lightest supersymmetric particle.
| [
{
"created": "Thu, 20 Jul 2000 08:32:35 GMT",
"version": "v1"
}
] | 2011-03-23 | [
[
"Chaichian",
"M.",
""
],
[
"Huitu",
"K.",
""
],
[
"Yu",
"Z. -H.",
""
]
] | We study the production of $(t+\bar{t}) \tilde{g}$ at the hadron colliders in an R-parity ($R_{p}$) violating supersymmetric model. This process provides us with information not only about $R_{p}$ violation, but may also help us in detecting the supersymmetry itself. It is possible to detect an $R_{p}$ violating signal (with single gluino production) at the future hadron colliders, such as Fermilab Tevatron Run II or CERN Large Hadron Collider (LHC), if the parameters in the supersymmetric $\rlap/ R_{p}$ interactions are not too small, e.g. for $m_{\tilde{g}}=1$ TeV, $\lambda^{''}=0.1$, still hundreds of events are produced at LHC with luminosity $30 fb^{-1}$. Even if we could not detect a signal of $ \rlap/R_{p}$ in the experiment, we get stringent constraints on the heavy flavour $\rlap/R_{p}$ couplings. In addition to the minimal supersymmetric standard model we have also considered some models with a heavy gluino as the lightest supersymmetric particle. |
hep-ph/0409010 | Robert Harlander | Robert V. Harlander, Matthias Steinhauser | Supersymmetric Higgs production in gluon fusion at next-to-leading order | 27 pages, LaTeX, 31 embedded PostScript-files; v2: typos corrected,
reformatted in JHEP style; accepted for publication in JHEP | JHEP0409:066,2004 | 10.1088/1126-6708/2004/09/066 | DESY 04-150, TTP 04-19 | hep-ph | null | The next-to-leading order (NLO) QCD corrections to the production and decay
rate of a Higgs boson are computed within the framework of the Minimal
Supersymmetric Standard Model (MSSM). The calculation is based on an effective
theory for light and intermediate mass Higgs bosons. We provide a Fortran
routine for the numerical evaluation of the coefficient function. For most of
the MSSM parameter space, the relative size of the NLO corrections is typically
of the order of 5% smaller than the Standard Model value. We exemplify the
numerical results for two scenarios: the benchmark point SPS1a, and a parameter
region where the gluon-Higgs coupling at leading order is very small due to a
cancellation of the squark and quark contributions.
| [
{
"created": "Wed, 1 Sep 2004 13:29:42 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Sep 2004 08:03:09 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Harlander",
"Robert V.",
""
],
[
"Steinhauser",
"Matthias",
""
]
] | The next-to-leading order (NLO) QCD corrections to the production and decay rate of a Higgs boson are computed within the framework of the Minimal Supersymmetric Standard Model (MSSM). The calculation is based on an effective theory for light and intermediate mass Higgs bosons. We provide a Fortran routine for the numerical evaluation of the coefficient function. For most of the MSSM parameter space, the relative size of the NLO corrections is typically of the order of 5% smaller than the Standard Model value. We exemplify the numerical results for two scenarios: the benchmark point SPS1a, and a parameter region where the gluon-Higgs coupling at leading order is very small due to a cancellation of the squark and quark contributions. |
1909.12845 | Ranjan Laha | Jeff A. Dror, Ranjan Laha, and Toby Opferkuch | Probing muonic forces with neutron star binaries | v2: 12 pages, 5 figures. Discussion lengthened and typos corrected.
Conclusions unchanged. Matches journal version | Phys. Rev. D 102, 023005 (2020) | 10.1103/PhysRevD.102.023005 | CERN-TH-2019-150 | hep-ph astro-ph.CO astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that gravitational wave emission from neutron star binaries can be
used to discover any generic long-ranged muonic force due to the large
inevitable abundance of muons inside neutron stars. As a minimal consistent
example, we focus on a gauged U(1)$_{L_\mu - L_\tau}$ symmetry. In pulsar
binaries, such U(1)$_{L_\mu - L_\tau}$ vectors induce an anomalously fast decay
of the orbital period through the emission of dipole radiation. We study a
range of different pulsar binaries, finding the most powerful constraints for
vector masses below ${\cal O}(10^{-18} {\rm eV})$. For merging binaries the
presence of muons in neutron stars can result in dipole radiation as well as a
modification of the chirp mass during the inspiral phase. We make projections
for a prospective search using both the GW170817 and S190814bv events and find
that current data can discover light vectors with masses below ${\cal
O}(10^{-10} {\rm eV})$. In both cases, the limits attainable with neutron stars
reach gauge coupling $g^\prime\lesssim 10^{-20}$, which are many orders of
magnitude stronger than previous constraints. We also show projections for next
generation experiments, such as Einstein Telescope and Cosmic Explorer.
| [
{
"created": "Fri, 27 Sep 2019 18:00:01 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Jul 2020 14:16:37 GMT",
"version": "v2"
}
] | 2020-07-14 | [
[
"Dror",
"Jeff A.",
""
],
[
"Laha",
"Ranjan",
""
],
[
"Opferkuch",
"Toby",
""
]
] | We show that gravitational wave emission from neutron star binaries can be used to discover any generic long-ranged muonic force due to the large inevitable abundance of muons inside neutron stars. As a minimal consistent example, we focus on a gauged U(1)$_{L_\mu - L_\tau}$ symmetry. In pulsar binaries, such U(1)$_{L_\mu - L_\tau}$ vectors induce an anomalously fast decay of the orbital period through the emission of dipole radiation. We study a range of different pulsar binaries, finding the most powerful constraints for vector masses below ${\cal O}(10^{-18} {\rm eV})$. For merging binaries the presence of muons in neutron stars can result in dipole radiation as well as a modification of the chirp mass during the inspiral phase. We make projections for a prospective search using both the GW170817 and S190814bv events and find that current data can discover light vectors with masses below ${\cal O}(10^{-10} {\rm eV})$. In both cases, the limits attainable with neutron stars reach gauge coupling $g^\prime\lesssim 10^{-20}$, which are many orders of magnitude stronger than previous constraints. We also show projections for next generation experiments, such as Einstein Telescope and Cosmic Explorer. |
2111.01150 | Geraldine Servant | Yann Gouttenoire, Geraldine Servant and Peera Simakachorn | Kination cosmology from scalar fields and gravitational-wave signatures | 95 pages, 49 figures (main text without references) + 35 pages, 11
figures (appendices). v2: Fixed model-dependent part, enlarged region of
parameter space for thermal damping. Plots updated accordingly.
Clarifications also added in model-independent part. Link to Youtube video:
https://www.youtube.com/watch?v=RdCAgcvfFy0 | null | null | DESY 21-134 | hep-ph astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | Kination denotes an era in the cosmological history corresponding to an
equation of state $\omega=+1$ such that the total energy density of the
universe redshifts as the sixth inverse power of the scale factor. This arises
if the universe is dominated by the kinetic energy of a scalar field. It has
often been motivated in the literature as an era following inflation, taking
place before the radiation era. In this paper, we review instead the
possibility that kination is disconnected from primordial inflation and occurs
much later, inside the Standard Model radiation era. We study the implications
on all main sources of primordial gravitational waves. We show how this leads
to very distinctive peaked spectra in the stochastic background of long-lasting
cosmological sources of gravitational waves, namely the irreducible
gravitational waves from inflation, and gravitational waves from cosmic
strings, both local and global, with promising observational prospects. We
present model-independent signatures and detectability predictions at SKA,
LIGO, LISA, ET, CE, BBO, as a function of the energy scale and duration of the
kination era. We then argue that such intermediate kination era is in fact
symptomatic in a large class of axion models. We analyse in details the scalar
field dynamics, the working conditions and constraints in the underlying
models. We present the gravitational-wave predictions as a function of particle
physics parameters. We derive the general relation between the
gravitational-wave signal and the axion dark matter abundance as well as the
baryon asymmetry. We investigate the predictions for the special case of the
QCD axion. The key message is that gravitational-waves of primordial origin
represent an alternative experimental probe of axion models.
| [
{
"created": "Mon, 1 Nov 2021 18:00:02 GMT",
"version": "v1"
},
{
"created": "Sun, 1 May 2022 20:56:44 GMT",
"version": "v2"
}
] | 2022-05-03 | [
[
"Gouttenoire",
"Yann",
""
],
[
"Servant",
"Geraldine",
""
],
[
"Simakachorn",
"Peera",
""
]
] | Kination denotes an era in the cosmological history corresponding to an equation of state $\omega=+1$ such that the total energy density of the universe redshifts as the sixth inverse power of the scale factor. This arises if the universe is dominated by the kinetic energy of a scalar field. It has often been motivated in the literature as an era following inflation, taking place before the radiation era. In this paper, we review instead the possibility that kination is disconnected from primordial inflation and occurs much later, inside the Standard Model radiation era. We study the implications on all main sources of primordial gravitational waves. We show how this leads to very distinctive peaked spectra in the stochastic background of long-lasting cosmological sources of gravitational waves, namely the irreducible gravitational waves from inflation, and gravitational waves from cosmic strings, both local and global, with promising observational prospects. We present model-independent signatures and detectability predictions at SKA, LIGO, LISA, ET, CE, BBO, as a function of the energy scale and duration of the kination era. We then argue that such intermediate kination era is in fact symptomatic in a large class of axion models. We analyse in details the scalar field dynamics, the working conditions and constraints in the underlying models. We present the gravitational-wave predictions as a function of particle physics parameters. We derive the general relation between the gravitational-wave signal and the axion dark matter abundance as well as the baryon asymmetry. We investigate the predictions for the special case of the QCD axion. The key message is that gravitational-waves of primordial origin represent an alternative experimental probe of axion models. |
1310.0243 | John Gracey | J.M. Bell, J.A. Gracey | MOM renormalization group functions in the maximal abelian gauge | 32 latex pages, anc directory contains txt file with beta-functions,
anomalous dimensions, coupling constant mappings, conversion functions and
amplitudes in analytic form | null | 10.1103/PhysRevD.88.085027 | LTH 985 | hep-ph hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The one loop 3-point vertex functions of QCD in the maximal abelian gauge
(MAG) are evaluated at the fully symmetric point at one loop. As a consequence
the theory is renormalized in the various momentum (MOM) schemes which are
defined by the trivalent vertices, as well as in the MSbar scheme. From these
the two loop renormalization group functions in the MOM schemes are derived
using the one loop conversion functions. In parallel we repeat the analysis for
the Curci-Ferrari gauge which corresponds to the MAG in a specific limit. The
relation between the Lambda parameters in different schemes is also provided.
| [
{
"created": "Tue, 1 Oct 2013 11:16:45 GMT",
"version": "v1"
}
] | 2015-06-17 | [
[
"Bell",
"J. M.",
""
],
[
"Gracey",
"J. A.",
""
]
] | The one loop 3-point vertex functions of QCD in the maximal abelian gauge (MAG) are evaluated at the fully symmetric point at one loop. As a consequence the theory is renormalized in the various momentum (MOM) schemes which are defined by the trivalent vertices, as well as in the MSbar scheme. From these the two loop renormalization group functions in the MOM schemes are derived using the one loop conversion functions. In parallel we repeat the analysis for the Curci-Ferrari gauge which corresponds to the MAG in a specific limit. The relation between the Lambda parameters in different schemes is also provided. |
hep-ph/9511282 | null | Bing-Lin Young | Some Phenomenology of the top quark with non-standard couplings | 5 pages, Latex, figures available by request | null | null | null | hep-ph | null | In this talk I will use effective lagrangian and discuss possible new physics
associated with top quark.
| [
{
"created": "Thu, 9 Nov 1995 16:49:38 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Nov 1995 17:32:39 GMT",
"version": "v2"
}
] | 2008-02-03 | [
[
"Young",
"Bing-Lin",
""
]
] | In this talk I will use effective lagrangian and discuss possible new physics associated with top quark. |
2108.00869 | Meng-He Wu | Yi Ling, Yuxuan Liu, Sai Wang and Meng-He Wu | The implications of gamma-ray photons from LHAASO on Lorentz symmetry | 6 pages, 3 figures and 1 table | Chin.Phys.C 46 (2022) 5, 055101 | 10.1088/1674-1137/ac4704 | null | hep-ph astro-ph.HE gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Large High Altitude Air Shower Observatory (LHAASO) has reported the
measurement of photons with high energy up to 1.42 PeV from twelve gamma-ray
sources. We are concerned with the implications of LHAASO data on the fate of
Lorenz symmetry at such high energy level, thus we consider the interaction of
the gamma ray with those photons in cosmic microwave background (CMB), and
compute the optical depth, the mean free path as well as the survival
probability for photons from all these gamma-ray sources. Employing the
threshold value predicted by the standard special relativity, it is found that
the lowest survival probability for observed gamma ray photons is about 0.60,
which is a fairly high value and implies that abundant photons with energy
above the threshold value may reach the Earth without Lorentz symmetry
violation. We conclude that it is still far to argue that the Lorentz symmetry
would be violated due to the present observations from LHAASO.
| [
{
"created": "Mon, 2 Aug 2021 13:00:02 GMT",
"version": "v1"
},
{
"created": "Mon, 2 May 2022 14:37:48 GMT",
"version": "v2"
}
] | 2022-05-03 | [
[
"Ling",
"Yi",
""
],
[
"Liu",
"Yuxuan",
""
],
[
"Wang",
"Sai",
""
],
[
"Wu",
"Meng-He",
""
]
] | The Large High Altitude Air Shower Observatory (LHAASO) has reported the measurement of photons with high energy up to 1.42 PeV from twelve gamma-ray sources. We are concerned with the implications of LHAASO data on the fate of Lorenz symmetry at such high energy level, thus we consider the interaction of the gamma ray with those photons in cosmic microwave background (CMB), and compute the optical depth, the mean free path as well as the survival probability for photons from all these gamma-ray sources. Employing the threshold value predicted by the standard special relativity, it is found that the lowest survival probability for observed gamma ray photons is about 0.60, which is a fairly high value and implies that abundant photons with energy above the threshold value may reach the Earth without Lorentz symmetry violation. We conclude that it is still far to argue that the Lorentz symmetry would be violated due to the present observations from LHAASO. |
1905.01872 | Gergely G\'abor Barnaf\"oldi | P\'eter P\'osfay, Gergely G\'abor Barnaf\"oldi, Antal Jakov\'ac | Estimating the variation of neutron star observables by symmetric dense
nuclear matter properties | 14 pages, 5 figures 2 tables | null | null | null | hep-ph astro-ph.HE nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent multi-channel astrophysics observations and the soon-to-be published
new measured electromagnetic and gravitation data provide information on the
inner structure of the compact stars. These macroscopic observations can
significantly increase our knowledge on the neutron star enteriors, providing
constraints on the microscopic physical properties. On the other hand, due to
the masquarade problem, there are still uncertainties on the various
nuclear-matter models and their parameters as well. Calculating the properties
of the dense nuclear matter, effective field theories are the most widely-used
tools. However the values of the microscopical parameters need to be set
consistently to the nuclear and astrophysical measurements. In this work we
investigate how uncertainties are induced by the variation of the microscopical
parameters. We use a symmetric nuclear matter in an extended $\sigma$-$\omega$
model. We calculate the dense matter equation of state and give the mass-radius
diagram. We present that the Landau mass and compressibility modulus of the
nuclear matter have definite linear relation to the maximum mass of a
Schwarzschild neutron star.
| [
{
"created": "Mon, 6 May 2019 08:22:27 GMT",
"version": "v1"
}
] | 2019-05-07 | [
[
"Pósfay",
"Péter",
""
],
[
"Barnaföldi",
"Gergely Gábor",
""
],
[
"Jakovác",
"Antal",
""
]
] | Recent multi-channel astrophysics observations and the soon-to-be published new measured electromagnetic and gravitation data provide information on the inner structure of the compact stars. These macroscopic observations can significantly increase our knowledge on the neutron star enteriors, providing constraints on the microscopic physical properties. On the other hand, due to the masquarade problem, there are still uncertainties on the various nuclear-matter models and their parameters as well. Calculating the properties of the dense nuclear matter, effective field theories are the most widely-used tools. However the values of the microscopical parameters need to be set consistently to the nuclear and astrophysical measurements. In this work we investigate how uncertainties are induced by the variation of the microscopical parameters. We use a symmetric nuclear matter in an extended $\sigma$-$\omega$ model. We calculate the dense matter equation of state and give the mass-radius diagram. We present that the Landau mass and compressibility modulus of the nuclear matter have definite linear relation to the maximum mass of a Schwarzschild neutron star. |
1401.5944 | Yuta Orikasa | Michio Hashimoto, Satoshi Iso, Yuta Orikasa | Radiative Symmetry Breaking from Flat Potential in various U(1)' models | 14 pages, 5 figures; references added, to appear in PRD | Phys. Rev. D 89, 056010 (2014) | 10.1103/PhysRevD.89.056010 | KEK-TH 1700, OU-HET 805 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate a radiative electroweak gauge symmetry breaking scenario via
the Coleman-Weinberg mechanism starting from a completely flat Higgs potential
at the Planck scale ("flatland scenario"). In our previous paper, we showed
that the flatland scenario is possible only when an inequality K<1 among the
coefficients of the beta functions is satisfied. In this paper, we calculate
the number K in various models with an extra U(1) gauge sector in addition to
the SM particles. We also show the renormalization group (RG) behaviors of a
couple of the models as examples.
| [
{
"created": "Thu, 23 Jan 2014 11:40:44 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Jan 2014 13:02:19 GMT",
"version": "v2"
},
{
"created": "Thu, 27 Feb 2014 14:26:34 GMT",
"version": "v3"
}
] | 2014-03-26 | [
[
"Hashimoto",
"Michio",
""
],
[
"Iso",
"Satoshi",
""
],
[
"Orikasa",
"Yuta",
""
]
] | We investigate a radiative electroweak gauge symmetry breaking scenario via the Coleman-Weinberg mechanism starting from a completely flat Higgs potential at the Planck scale ("flatland scenario"). In our previous paper, we showed that the flatland scenario is possible only when an inequality K<1 among the coefficients of the beta functions is satisfied. In this paper, we calculate the number K in various models with an extra U(1) gauge sector in addition to the SM particles. We also show the renormalization group (RG) behaviors of a couple of the models as examples. |
2305.11958 | Shohei Okawa | Luca Di Luzio, Maurizio Giannotti, Federico Mescia, Enrico Nardi,
Shohei Okawa, Gioacchino Piazza | Running effects on QCD axion phenomenology | 15 pages, 6 figures, 4 tables. v2: journal version | Phys.Rev.D 108 (2023) 11, 115004 | 10.1103/PhysRevD.108.115004 | null | hep-ph astro-ph.CO astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | We study the impact of renormalization group effects on QCD axion
phenomenology. Focusing on the DFSZ model, we argue that the relevance of
running effects for the axion couplings crucially depends on the scale where
the heavier Higgs scalars are integrated out. We study the impact of these
effects on astrophysical and cosmological bounds as well as on the sensitivity
of helioscopes experiments such as IAXO and XENONnT, showing that they can be
sizable even in the most conservative case in which the two Higgs doublets
remain as light as the TeV scale. We provide simple analytical expressions that
accurately fit the numerical solutions of the renormalization group equations
as a function of the mass scale of the heavy scalars.
| [
{
"created": "Fri, 19 May 2023 18:45:35 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Dec 2023 03:30:22 GMT",
"version": "v2"
}
] | 2023-12-29 | [
[
"Di Luzio",
"Luca",
""
],
[
"Giannotti",
"Maurizio",
""
],
[
"Mescia",
"Federico",
""
],
[
"Nardi",
"Enrico",
""
],
[
"Okawa",
"Shohei",
""
],
[
"Piazza",
"Gioacchino",
""
]
] | We study the impact of renormalization group effects on QCD axion phenomenology. Focusing on the DFSZ model, we argue that the relevance of running effects for the axion couplings crucially depends on the scale where the heavier Higgs scalars are integrated out. We study the impact of these effects on astrophysical and cosmological bounds as well as on the sensitivity of helioscopes experiments such as IAXO and XENONnT, showing that they can be sizable even in the most conservative case in which the two Higgs doublets remain as light as the TeV scale. We provide simple analytical expressions that accurately fit the numerical solutions of the renormalization group equations as a function of the mass scale of the heavy scalars. |
hep-ph/0211397 | Paolo Gondolo | Paolo Gondolo, Katherine Freese | An Accelerating Universe from Dark Matter Interactions with Negative
Pressure | 12 pages | null | null | CWRU-P17-02, NSF-ITP-02-173 | hep-ph | null | As an explanation for the acceleration of the universe, we propose dark
matter with self-interactions characterized by a negative pressure; there is no
vacuum energy whatsoever in this Cardassian model. These self-interactions may
arise due to a long-range "fifth force" which grows with the distance between
particles. We use the ordinary Friedmann equation, $H^2 = 8 \pi G \rho/3$, and
take the energy density to be the sum of two terms: $\rho = \rho_M + \rho_K$.
Here $\rho_M \equiv m n_M$ is the ordinary mass density and $\rho_K \equiv
\rho_K(\rho_M)$ is a new interaction term which depends only on the matter
density. For example, in the original version of the Cardassian model, $\rho_K
= b \rho_M^n$ with $n<2/3$; other examples are studied as well. We use the
ordinary four-dimensional Einstein's equations $G_{\mu\nu} = 8 \pi G T_{\mu\nu}
$ and assume a perfect fluid form for the energy momentum tensor. Given this
ansatz, we can compute the accompanying pressure, and use the conservation of
the energy-momentum tensor to obtain modified forms of the Euler's equation,
Poisson equation, and continuity equation. With this fully relativistic
description, one will then be able to compute growth of density perturbations,
effects on the Cosmic Background Radiation, and other effects with an eye to
observational tests of the model.
| [
{
"created": "Tue, 26 Nov 2002 15:53:45 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Gondolo",
"Paolo",
""
],
[
"Freese",
"Katherine",
""
]
] | As an explanation for the acceleration of the universe, we propose dark matter with self-interactions characterized by a negative pressure; there is no vacuum energy whatsoever in this Cardassian model. These self-interactions may arise due to a long-range "fifth force" which grows with the distance between particles. We use the ordinary Friedmann equation, $H^2 = 8 \pi G \rho/3$, and take the energy density to be the sum of two terms: $\rho = \rho_M + \rho_K$. Here $\rho_M \equiv m n_M$ is the ordinary mass density and $\rho_K \equiv \rho_K(\rho_M)$ is a new interaction term which depends only on the matter density. For example, in the original version of the Cardassian model, $\rho_K = b \rho_M^n$ with $n<2/3$; other examples are studied as well. We use the ordinary four-dimensional Einstein's equations $G_{\mu\nu} = 8 \pi G T_{\mu\nu} $ and assume a perfect fluid form for the energy momentum tensor. Given this ansatz, we can compute the accompanying pressure, and use the conservation of the energy-momentum tensor to obtain modified forms of the Euler's equation, Poisson equation, and continuity equation. With this fully relativistic description, one will then be able to compute growth of density perturbations, effects on the Cosmic Background Radiation, and other effects with an eye to observational tests of the model. |
1312.0448 | Andrej Arbuzov | A.B. Arbuzov and T.V. Kopylova | Off-mass-shell muon anomalous magnetic moment | 5 pages | Phys. Part. Nucl. Lett. 11, 339-341 (2014) | 10.1134/S1547477114040086 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Interaction of charged leptons with photons is considered for the case when
one of the lepton legs is off the mass shell. The effect due to off-mass-shell
shift in the anomalous magnetic moment is computed within one-loop
approximation. Possible contributions of this effect in the muon $g-2$
measurements are discussed.
| [
{
"created": "Mon, 2 Dec 2013 13:36:33 GMT",
"version": "v1"
}
] | 2017-08-11 | [
[
"Arbuzov",
"A. B.",
""
],
[
"Kopylova",
"T. V.",
""
]
] | Interaction of charged leptons with photons is considered for the case when one of the lepton legs is off the mass shell. The effect due to off-mass-shell shift in the anomalous magnetic moment is computed within one-loop approximation. Possible contributions of this effect in the muon $g-2$ measurements are discussed. |
hep-ph/0310119 | Evgeny Akhmedov | Evgeny Akhmedov and Takeshi Fukuyama | Supernova prompt neutronization neutrinos and neutrino magnetic moments | LaTex, 25 pages, 3 figures. v4: Discussion section expanded,
references added. Matches the published version | JCAP0312:007,2003 | 10.1088/1475-7516/2003/12/007 | null | hep-ph astro-ph hep-ex | null | It is shown that the combined action of spin-flavor conversions of supernova
neutrinos due to the interactions of their Majorana-type transition magnetic
moments with the supernova magnetic fields and flavor conversions due to the
mass mixing can lead to the transformation of \nu_e born in the neutronization
process into their antiparticles \bar{\nu}_e. Such an effect would have a clear
experimental signature and its observation would be a smoking gun evidence for
the neutrino transition magnetic moments. It would also signify the leptonic
mixing parameter |U_{e3}| in excess of 10^{-2}.
| [
{
"created": "Thu, 9 Oct 2003 17:48:11 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Oct 2003 18:12:04 GMT",
"version": "v2"
},
{
"created": "Fri, 31 Oct 2003 14:08:09 GMT",
"version": "v3"
},
{
"created": "Mon, 15 Mar 2004 16:26:59 GMT",
"version": "v4"
}
] | 2008-11-26 | [
[
"Akhmedov",
"Evgeny",
""
],
[
"Fukuyama",
"Takeshi",
""
]
] | It is shown that the combined action of spin-flavor conversions of supernova neutrinos due to the interactions of their Majorana-type transition magnetic moments with the supernova magnetic fields and flavor conversions due to the mass mixing can lead to the transformation of \nu_e born in the neutronization process into their antiparticles \bar{\nu}_e. Such an effect would have a clear experimental signature and its observation would be a smoking gun evidence for the neutrino transition magnetic moments. It would also signify the leptonic mixing parameter |U_{e3}| in excess of 10^{-2}. |
hep-ph/0211078 | Ignacio Bediaga | Ignacio Bediaga and Jussara M. de Miranda | Complex amplitude phase motion in Dalitz plot heavy meson three body
decay | To appear in Physics Letters B | Phys.Lett. B550 (2002) 135-139 | 10.1016/S0370-2693(02)02983-0 | null | hep-ph hep-ex | null | We propose a method to determine the phase motion of a complex amplitude in
three body heavy meson decays. We show that the phase variation of a complex
amplitude can be directly revealed through the interference observed in the
Dalitz Plot region where it crosses with a well established resonant state.
This method could be applied to the decays \d3pi and $D^+\to K^-\pi^+\pi^+$, to
determine whether the low mass states $\sigma$ and $\kappa$, suggested by E791,
have phase motions compatible with resonances.
| [
{
"created": "Wed, 6 Nov 2002 16:30:19 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Bediaga",
"Ignacio",
""
],
[
"de Miranda",
"Jussara M.",
""
]
] | We propose a method to determine the phase motion of a complex amplitude in three body heavy meson decays. We show that the phase variation of a complex amplitude can be directly revealed through the interference observed in the Dalitz Plot region where it crosses with a well established resonant state. This method could be applied to the decays \d3pi and $D^+\to K^-\pi^+\pi^+$, to determine whether the low mass states $\sigma$ and $\kappa$, suggested by E791, have phase motions compatible with resonances. |
1907.11595 | Haiying Cai | Haiying Cai | Radiative neutrino model with semi-annihilation dark matter | 27 pages, 8 figures and 1 table; v5 accepted by Physics Review D; v4
add T parameter calculation detail in Appendix B; v3 updated with the EWPT
bound and more detail for the model and neutrino mass loop function; v2 typo
corrected and figure updated | Phys. Rev. D 101, 035006 (2020) | 10.1103/PhysRevD.101.035006 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a Two-Loop induced radiative neutrino model with hidden gauged
$U(1)$ symmetry, in which a dark matter of Dirac fermion arises. The relic
density gets contribution from annihilation and semi-annihilation due to a
residual $\mathbb{Z}_3$ parity. After imposing the requirement of neutrino
oscillation data and lepton flavour violation bounds, we find out that the
semi-annihilation plays a crucial role in order to satisfy the relic density
constraint $0.117 < \Omega h^2 < 0.123$, by proceeding near either one of two
deconstructive scalar resonances. Our numerical analysis demonstrates the
allowed region for the DM-Scalar coupling with the DM mass in $(80, 400)$ GeV.
| [
{
"created": "Fri, 26 Jul 2019 14:36:23 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Aug 2019 15:58:53 GMT",
"version": "v2"
},
{
"created": "Mon, 4 Nov 2019 18:51:18 GMT",
"version": "v3"
},
{
"created": "Wed, 6 Nov 2019 17:56:18 GMT",
"version": "v4"
},
{
"created": "Sun, 15 Dec 2019 11:58:20 GMT",
"version": "v5"
}
] | 2020-02-12 | [
[
"Cai",
"Haiying",
""
]
] | We propose a Two-Loop induced radiative neutrino model with hidden gauged $U(1)$ symmetry, in which a dark matter of Dirac fermion arises. The relic density gets contribution from annihilation and semi-annihilation due to a residual $\mathbb{Z}_3$ parity. After imposing the requirement of neutrino oscillation data and lepton flavour violation bounds, we find out that the semi-annihilation plays a crucial role in order to satisfy the relic density constraint $0.117 < \Omega h^2 < 0.123$, by proceeding near either one of two deconstructive scalar resonances. Our numerical analysis demonstrates the allowed region for the DM-Scalar coupling with the DM mass in $(80, 400)$ GeV. |
1207.6227 | Georg Wolschin | Felix Nendzig and Georg Wolschin | Upsilon Suppression in PbPb Collisions at sqrt(s_NN) = 2.76 TeV | 4 pages, 3 figures, Proc. Hard Probes 2012 conference | null | null | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We suggest that the combined effect of screening, gluon-induced dissociation,
collisional damping, and reduced feed-down explains most of the sequential
suppression of Y(nS) states that has been observed in PbPb relative to pp
collisions at sqrt(s_NN) = 2.76 TeV. The suppression is thus a clear, albeit
indirect, indication for the presence of a qgp.
| [
{
"created": "Thu, 26 Jul 2012 10:26:15 GMT",
"version": "v1"
}
] | 2012-07-27 | [
[
"Nendzig",
"Felix",
""
],
[
"Wolschin",
"Georg",
""
]
] | We suggest that the combined effect of screening, gluon-induced dissociation, collisional damping, and reduced feed-down explains most of the sequential suppression of Y(nS) states that has been observed in PbPb relative to pp collisions at sqrt(s_NN) = 2.76 TeV. The suppression is thus a clear, albeit indirect, indication for the presence of a qgp. |
1203.3426 | Igor Ivanov | I. P. Ivanov, V. Keus | Z_p scalar dark matter from multi-Higgs-doublet models | 10 pages | null | 10.1103/PhysRevD.86.016004 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In many models, stability of dark matter particles is protected by a
conserved Z_2 quantum number. However dark matter can be stabilized by other
discrete symmetry groups, and examples of such models with custom-tailored
field content have been proposed. Here we show that electroweak symmetry
breaking models with N Higgs doublets can readily accommodate scalar dark
matter candidates stabilized by groups Z_p with any $p \le 2^{N-1}$, leading to
a variety of kinds of microscopic dynamics in the dark sector. We give examples
in which semi-annihilation or multiple semi-annihilation processes are allowed
or forbidden, which can be especially interesting in the case of asymmetric
dark matter.
| [
{
"created": "Thu, 15 Mar 2012 17:51:38 GMT",
"version": "v1"
}
] | 2013-05-30 | [
[
"Ivanov",
"I. P.",
""
],
[
"Keus",
"V.",
""
]
] | In many models, stability of dark matter particles is protected by a conserved Z_2 quantum number. However dark matter can be stabilized by other discrete symmetry groups, and examples of such models with custom-tailored field content have been proposed. Here we show that electroweak symmetry breaking models with N Higgs doublets can readily accommodate scalar dark matter candidates stabilized by groups Z_p with any $p \le 2^{N-1}$, leading to a variety of kinds of microscopic dynamics in the dark sector. We give examples in which semi-annihilation or multiple semi-annihilation processes are allowed or forbidden, which can be especially interesting in the case of asymmetric dark matter. |
1204.3665 | Bartosz Dziewit | Bartosz Dziewit, Sebastian Zajac, Marek Zralek | Majorana neutrino mass matrix with CP symmetry breaking | 6 pages, 2 figures, presented at the XXXV International Conference of
Theoretical Physics "Matter to the Deepest 2011", Ustron, Poland, September
12-18, 2011 | Acta Phys.Polon.B42:2509-2516,2011 | 10.5506/APhysPolB.42.2509 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | From the new existing data with not vanishing theta13 mixing angle we
determine the possible shape of the Majorana neutrino mass matrix. We assume
that CP symmetry is broken and all Dirac and Majorana phases are taken into
account. Two possible approaches "bottom-up" and "top down" are presented. The
problem of unphysical phases is examined in detail.
| [
{
"created": "Mon, 16 Apr 2012 22:24:55 GMT",
"version": "v1"
}
] | 2012-04-18 | [
[
"Dziewit",
"Bartosz",
""
],
[
"Zajac",
"Sebastian",
""
],
[
"Zralek",
"Marek",
""
]
] | From the new existing data with not vanishing theta13 mixing angle we determine the possible shape of the Majorana neutrino mass matrix. We assume that CP symmetry is broken and all Dirac and Majorana phases are taken into account. Two possible approaches "bottom-up" and "top down" are presented. The problem of unphysical phases is examined in detail. |
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