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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2202.08392 | Shuang-Yong Zhou | Si-Yuan Hou, Paul M. Saffin, Qi-Xin Xie, and Shuang-Yong Zhou | Charge-Swapping Q-balls in a Logarithmic Potential and Affleck-Dine
condensate fragmentation | 23 pages, 15 figures | null | null | null | hep-ph astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study charge-swapping Q-balls, a kind of composite Q-ball where positive
and negative charges co-exist and swap with time, in models with a logarithmic
potential that arises naturally in supersymmetric extensions of the Standard
Model. We show that charge-swapping Q-balls can be copiously generated in the
Affleck-Dine fragmentation process in the early universe. We find that the
charge-swapping Q-balls with the logarithmic potential are extremely stable. By
performing long time, parallelized lattice simulations with absorbing boundary
conditions, we find that the lifetimes of such objects with low multipoles are
at least $4.6 \times 10^5/m$ in 3+1D and $2.5 \times 10^7/m$ in 2+1D, where $m$
is the mass scale of the scalar field. We also chart the attractor basin of the
initial conditions to form these charge-swapping Q-balls.
| [
{
"created": "Thu, 17 Feb 2022 01:12:29 GMT",
"version": "v1"
}
] | 2022-02-21 | [
[
"Hou",
"Si-Yuan",
""
],
[
"Saffin",
"Paul M.",
""
],
[
"Xie",
"Qi-Xin",
""
],
[
"Zhou",
"Shuang-Yong",
""
]
] | We study charge-swapping Q-balls, a kind of composite Q-ball where positive and negative charges co-exist and swap with time, in models with a logarithmic potential that arises naturally in supersymmetric extensions of the Standard Model. We show that charge-swapping Q-balls can be copiously generated in the Affleck-Dine fragmentation process in the early universe. We find that the charge-swapping Q-balls with the logarithmic potential are extremely stable. By performing long time, parallelized lattice simulations with absorbing boundary conditions, we find that the lifetimes of such objects with low multipoles are at least $4.6 \times 10^5/m$ in 3+1D and $2.5 \times 10^7/m$ in 2+1D, where $m$ is the mass scale of the scalar field. We also chart the attractor basin of the initial conditions to form these charge-swapping Q-balls. |
1502.03894 | Akira Watanabe | Akira Watanabe and Hsiang-nan Li | Photon structure functions at small $x$ in holographic QCD | 6 pages, 5 figures; v2: version accepted for publication in Phys.
Lett. B, Fig. 2 and clarifications added to Section 3 | null | 10.1016/j.physletb.2015.10.069 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the photon structure functions at small Bjorken variable $x$
in the framework of the holographic QCD, assuming dominance of the Pomeron
exchange. The quasi-real photon structure functions are expressed as
convolution of the Brower-Polchinski-Strassler-Tan (BPST) Pomeron kernel and
the known wave functions of the U(1) vector field in the five-dimensional AdS
space, in which the involved parameters in the BPST kernel have been fixed in
previous studies of the nucleon structure functions. The predicted photon
structure functions, as confronted with data, provide a clean test of the BPST
kernel. The agreement between theoretical predictions and data is demonstrated,
which supports applications of holographic QCD to hadronic processes in the
nonperturbative region. Our results are also consistent with those derived from
the parton distribution functions of the photon proposed by Gl\"uck, Reya, and
Schienbein, implying realization of the vector meson dominance in the present
model setup.
| [
{
"created": "Fri, 13 Feb 2015 06:20:03 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Oct 2015 09:38:53 GMT",
"version": "v2"
}
] | 2015-11-04 | [
[
"Watanabe",
"Akira",
""
],
[
"Li",
"Hsiang-nan",
""
]
] | We investigate the photon structure functions at small Bjorken variable $x$ in the framework of the holographic QCD, assuming dominance of the Pomeron exchange. The quasi-real photon structure functions are expressed as convolution of the Brower-Polchinski-Strassler-Tan (BPST) Pomeron kernel and the known wave functions of the U(1) vector field in the five-dimensional AdS space, in which the involved parameters in the BPST kernel have been fixed in previous studies of the nucleon structure functions. The predicted photon structure functions, as confronted with data, provide a clean test of the BPST kernel. The agreement between theoretical predictions and data is demonstrated, which supports applications of holographic QCD to hadronic processes in the nonperturbative region. Our results are also consistent with those derived from the parton distribution functions of the photon proposed by Gl\"uck, Reya, and Schienbein, implying realization of the vector meson dominance in the present model setup. |
1811.02567 | Masaki Yamada | Ayuki Kamada, Masaki Yamada, Tsutomu T. Yanagida | Self-interacting dark matter with a vector mediator: kinetic mixing with
U(1)$_{(B-L)_3}$ gauge boson | 27 pages, 2 figures; v2: minor changes, Appendix A added, published
version | null | 10.1007/JHEP03(2019)021 | IPMU18-0179 | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A spontaneously broken hidden U(1)$_h$ gauge symmetry can explain both the
dark matter stability and the observed relic abundance. In this framework, the
light gauge boson can mediate the strong dark matter self-interaction, which
addresses astrophysical observations that are hard to explain in collisionless
cold dark matter. Motivated by flavoured grand unified theories, we introduce
right-handed neutrinos and a flavoured $B - L$ gauge symmetry for the third
family U(1)$_{(B-L)_3}$. The unwanted relic of the U(1)$_h$ gauge boson decays
into neutrinos via the kinetic mixing with the U(1)$_{(B - L)_3}$ gauge boson.
Indirect detection bounds on dark matter are systematically weakened, since
dark matter annihilation results in neutrinos. However, the kinetic mixing
between U(1)$_{(B - L)_3}$ and U(1)$_Y$ gauge bosons are induced by quantum
corrections and leads to an observable signal in direct and indirect detection
experiments of dark matter. This model can also explain the baryon asymmetry of
the Universe via the thermal leptogenesis. In addition, we discuss the
possibility of explaining the lepton flavour universality violation in
semi-leptonic $B$ meson decays that is recently found in the LHCb experiment.
| [
{
"created": "Tue, 6 Nov 2018 19:00:00 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Feb 2019 21:36:30 GMT",
"version": "v2"
}
] | 2019-03-27 | [
[
"Kamada",
"Ayuki",
""
],
[
"Yamada",
"Masaki",
""
],
[
"Yanagida",
"Tsutomu T.",
""
]
] | A spontaneously broken hidden U(1)$_h$ gauge symmetry can explain both the dark matter stability and the observed relic abundance. In this framework, the light gauge boson can mediate the strong dark matter self-interaction, which addresses astrophysical observations that are hard to explain in collisionless cold dark matter. Motivated by flavoured grand unified theories, we introduce right-handed neutrinos and a flavoured $B - L$ gauge symmetry for the third family U(1)$_{(B-L)_3}$. The unwanted relic of the U(1)$_h$ gauge boson decays into neutrinos via the kinetic mixing with the U(1)$_{(B - L)_3}$ gauge boson. Indirect detection bounds on dark matter are systematically weakened, since dark matter annihilation results in neutrinos. However, the kinetic mixing between U(1)$_{(B - L)_3}$ and U(1)$_Y$ gauge bosons are induced by quantum corrections and leads to an observable signal in direct and indirect detection experiments of dark matter. This model can also explain the baryon asymmetry of the Universe via the thermal leptogenesis. In addition, we discuss the possibility of explaining the lepton flavour universality violation in semi-leptonic $B$ meson decays that is recently found in the LHCb experiment. |
hep-ph/0203137 | Edmond Iancu | E. Iancu, K. Itakura, and L. McLerran | Geometric Scaling above the Saturation Scale | 24 pages | Nucl.Phys.A708:327-352,2002 | 10.1016/S0375-9474(02)01010-2 | Saclay-T02/027 | hep-ph | null | We show that the evolution equations in QCD predict geometric scaling for
quark and gluon distribution functions in a large kinematical window, which
extends above the saturation scale up to momenta $Q^2$ of order $100 {\rm
GeV}^2$. For $Q^2 < Q^2_s$, with $Q_s$ the saturation momentum, this is the
scaling predicted by the Colour Glass Condensate and by phenomenological
saturation models. For $1 \simle \ln(Q^2/Q_s^2) \ll \ln(Q_s^2/\Lambda^2_{\rm
QCD})$, we show that the solution to the BFKL equation shows approximate
scaling, with the scale set by $Q_s$. At larger $Q^2$, this solution does not
scale any longer. We argue that for the intermediate values of $Q^2$ where we
find scaling, the BFKL rather than the double logarithmic approximation to the
DGLAP equation properly describes the dynamics. We consider both fixed and
running couplings, with the scale for running set by the saturation momentum.
The anomalous dimension which characterizes the approach of the gluon
distribution function towards saturation is found to be close to, but lower
than, one half.
| [
{
"created": "Thu, 14 Mar 2002 16:48:09 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Iancu",
"E.",
""
],
[
"Itakura",
"K.",
""
],
[
"McLerran",
"L.",
""
]
] | We show that the evolution equations in QCD predict geometric scaling for quark and gluon distribution functions in a large kinematical window, which extends above the saturation scale up to momenta $Q^2$ of order $100 {\rm GeV}^2$. For $Q^2 < Q^2_s$, with $Q_s$ the saturation momentum, this is the scaling predicted by the Colour Glass Condensate and by phenomenological saturation models. For $1 \simle \ln(Q^2/Q_s^2) \ll \ln(Q_s^2/\Lambda^2_{\rm QCD})$, we show that the solution to the BFKL equation shows approximate scaling, with the scale set by $Q_s$. At larger $Q^2$, this solution does not scale any longer. We argue that for the intermediate values of $Q^2$ where we find scaling, the BFKL rather than the double logarithmic approximation to the DGLAP equation properly describes the dynamics. We consider both fixed and running couplings, with the scale for running set by the saturation momentum. The anomalous dimension which characterizes the approach of the gluon distribution function towards saturation is found to be close to, but lower than, one half. |
1310.5662 | James J. Beatty | J.J. Beatty, A.E. Nelson, A. Olinto, G. Sinnis, A. U. Abeysekara, L.A.
Anchordoqui, T. Aramaki, J. Belz, J.H. Buckley, K. Byrum, R. Cameron, M-C.
Chen, K. Clark, A. Connolly, D. Cowen, T. DeYoung, P. von Doetinchem J. Dumm,
M. Errando, G. Farrar, F. Ferrer, L. Fortson, S. Funk, D. Grant, S.
Griffiths, A. Gro\ss, C. Hailey, C. Hogan, J. Holder, B. Humensky, P. Kaaret,
S.R. Klein, H. Krawczynski, F. Krennrich, K. Krings, J. Krizmanic, A.
Kusenko, J. T. Linnemann, J. H. MacGibbon, J. Matthews, A. McCann, J.
Mitchell, R. Mukherjee, D. Nitz, R.A. Ong, M. Orr, N. Otte, T. Paul, E.
Resconi, M. A. Sanchez-Conde, P. Sokolsky, F. Stecker, D. Stump, I. Taboada,
G.B. Thomson, K. Tollefson, P. von Doetinchem, T. Ukwatta, J. Vandenbroucke,
V. Vasileiou, V.V. Vassileiv, T.J. Weiler, D.A. Williams, A. Weinstein, M.
Wood, B. Zitzer | Snowmass Cosmic Frontiers 6 (CF6) Working Group Summary --The Bright
Side of the Cosmic Frontier: Cosmic Probes of Fundamental Physics | Snowmass 2013 CF6 Working Group Report; author list corrected | null | null | null | hep-ph astro-ph.CO astro-ph.HE astro-ph.IM hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Report of the CF6 Working Group at Snowmass 2013. Topics addressed include
ultra-high energy cosmic rays, neutrinos, gamma rays, baryogenesis, and
experiments probing the fundamental nature of spacetime.
| [
{
"created": "Mon, 21 Oct 2013 18:14:10 GMT",
"version": "v1"
},
{
"created": "Fri, 25 Oct 2013 15:48:22 GMT",
"version": "v2"
}
] | 2013-10-28 | [
[
"Beatty",
"J. J.",
""
],
[
"Nelson",
"A. E.",
""
],
[
"Olinto",
"A.",
""
],
[
"Sinnis",
"G.",
""
],
[
"Abeysekara",
"A. U.",
""
],
[
"Anchordoqui",
"L. A.",
""
],
[
"Aramaki",
"T.",
""
],
[
"Belz",
... | Report of the CF6 Working Group at Snowmass 2013. Topics addressed include ultra-high energy cosmic rays, neutrinos, gamma rays, baryogenesis, and experiments probing the fundamental nature of spacetime. |
2205.11560 | Surabhi Tiwari | V. Ravindran, Aparna Sankar, Surabhi Tiwari | Resummed next-to-soft corrections to rapidity distribution of Higgs
Boson to $ \textbf{NNLO} + \overline{\textbf{NNLL} } $ | null | null | 10.1103/PhysRevD.108.014012 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the resumed predictions consisting of both soft-virtual(SV) as
well as next-to-SV(NSV) threshold logarithms to all orders in perturbative QCD
for the rapidity distribution of Higgs Boson till $\rm NNLO + \overline{NNLL}$
accuracy at LHC. Using our recent formalism\cite{Ajjath:2020lwb}, the
resummation is carried out in the double Mellin space by restricting the NSV
contributions only from diagonal $gg$ channel. We perform the inverse Mellin
ransformation using the minimal prescription procedure and match it with the
corresponding fixed order results. We do a detailed analysis of the numerical
impact of the resummed result. The K-factor values at different logarithmic
accuracy suggest that the prediction for the rapidity distribution converges
and becomes more reliable at $\rm NNLO + \overline{NNLL}$ order. We further
observed that the inclusion of resumed NSV contribution improves the
renormalisation scale uncertainty at every order in perturbation theory.
However, the uncertainty due to factorisation scale increases by the addition
of resummed SV+NSV predictions to the fixed order rapidity distribution.
| [
{
"created": "Mon, 23 May 2022 18:20:40 GMT",
"version": "v1"
}
] | 2023-07-26 | [
[
"Ravindran",
"V.",
""
],
[
"Sankar",
"Aparna",
""
],
[
"Tiwari",
"Surabhi",
""
]
] | We present the resumed predictions consisting of both soft-virtual(SV) as well as next-to-SV(NSV) threshold logarithms to all orders in perturbative QCD for the rapidity distribution of Higgs Boson till $\rm NNLO + \overline{NNLL}$ accuracy at LHC. Using our recent formalism\cite{Ajjath:2020lwb}, the resummation is carried out in the double Mellin space by restricting the NSV contributions only from diagonal $gg$ channel. We perform the inverse Mellin ransformation using the minimal prescription procedure and match it with the corresponding fixed order results. We do a detailed analysis of the numerical impact of the resummed result. The K-factor values at different logarithmic accuracy suggest that the prediction for the rapidity distribution converges and becomes more reliable at $\rm NNLO + \overline{NNLL}$ order. We further observed that the inclusion of resumed NSV contribution improves the renormalisation scale uncertainty at every order in perturbation theory. However, the uncertainty due to factorisation scale increases by the addition of resummed SV+NSV predictions to the fixed order rapidity distribution. |
hep-ph/9602248 | Bob Holdom | B. Holdom | Negative T from a dynamical left-handed neutrino mass | 8 pages, postscript, version to be published as Rapid Communications
in PRD, PDF file is available at
http://miteymac.physics.utoronto.ca/bh/papers/papers.html | Phys.Rev.D54:721-724,1996 | 10.1103/PhysRevD.54.R721 | UTPT-96-01 | hep-ph | null | We show how a dynamical Majorana mass for a fourth family left-handed
neutrino can make a significant negative contribution to the electroweak
correction parameter T without making a large contribution to S or U. We also
comment on other possible contributions to T in the context of dynamical
symmetry breaking.
| [
{
"created": "Wed, 7 Feb 1996 18:24:47 GMT",
"version": "v1"
},
{
"created": "Fri, 26 Apr 1996 23:09:08 GMT",
"version": "v2"
}
] | 2009-12-30 | [
[
"Holdom",
"B.",
""
]
] | We show how a dynamical Majorana mass for a fourth family left-handed neutrino can make a significant negative contribution to the electroweak correction parameter T without making a large contribution to S or U. We also comment on other possible contributions to T in the context of dynamical symmetry breaking. |
hep-ph/0002157 | Hai-Yang Cheng | Hai-Yang Cheng | The Proton Spin Puzzle: A Status Report | 22 pages, 2 figures, invited plenary talk presented at the 2000
Annual Meeting of the Physical Society of ROC, National Cheng-Kung
University, Taiwan, ROC, January 31 - February 1, 2000 | Chin.J.Phys.38:753,2000 | null | null | hep-ph hep-ex | null | The proton spin puzzle inspired by the EMC experiment and its present status
are closely examined. Recent experimental progress is reviewed. Various
factorization schemes due to the ambiguity arising from the axial anomaly are
discussed. Some misconceptions in the literature about the $\MS$ factorization
scheme are clarified. It is stressed that the polarized nucleon structure
function $g_1(x)$ is independent of the factorization scheme chosen in defining
the quark spin density. Consequently, the anomalous gluon and sea-quark
interpretations for the deviation of the observed first moment of $g_1^p(x)$
from the Ellis-Jaffe sum rule are equivalent. While it is well known that the
total quark spin in the chiral-invariant (CI) factorization scheme (e.g. the
improved parton model) can be made to be close to the quark model expectation
provided that the gluon spin is positive and large enough, it is much less
known that, contrary to the gauge-invariant scheme (e.g. the MSbar scheme), the
quark orbital angular momentum in the CI scheme deviates even farther from the
relativistic quark model prediction. Recent developments in the NLO analysis of
polarized DIS data, orbital angular momentum and lattice calculations of the
proton spin content are briefly sketched.
| [
{
"created": "Tue, 15 Feb 2000 22:38:05 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Mar 2000 03:32:58 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Cheng",
"Hai-Yang",
""
]
] | The proton spin puzzle inspired by the EMC experiment and its present status are closely examined. Recent experimental progress is reviewed. Various factorization schemes due to the ambiguity arising from the axial anomaly are discussed. Some misconceptions in the literature about the $\MS$ factorization scheme are clarified. It is stressed that the polarized nucleon structure function $g_1(x)$ is independent of the factorization scheme chosen in defining the quark spin density. Consequently, the anomalous gluon and sea-quark interpretations for the deviation of the observed first moment of $g_1^p(x)$ from the Ellis-Jaffe sum rule are equivalent. While it is well known that the total quark spin in the chiral-invariant (CI) factorization scheme (e.g. the improved parton model) can be made to be close to the quark model expectation provided that the gluon spin is positive and large enough, it is much less known that, contrary to the gauge-invariant scheme (e.g. the MSbar scheme), the quark orbital angular momentum in the CI scheme deviates even farther from the relativistic quark model prediction. Recent developments in the NLO analysis of polarized DIS data, orbital angular momentum and lattice calculations of the proton spin content are briefly sketched. |
1812.08016 | Hiroshi Okada | Takaaki Nomura, Hiroshi Okada | One-loop neutrino mass model with $SU(2)_L$ multiplet fields | 18 pages, 1 table, 7 figures, version accepted for publication in
Nuclear Physics B | null | 10.1016/j.nuclphysb.2019.114621 | KIAS-P18115, APCTP Pre2018 - 017 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a one-loop neutrino mass model with several $SU(2)_L$ multiplet
fermions and scalar fields in which the inert feature of a scalar to realize
the one-loop neutrino mass can be achieved by the cancellation among Higgs
couplings thanks to non-trivial terms in the Higgs potential and to present it
in a simpler way. Then we discuss our typical cut-off scale by computing
renormalization group equation for $SU(2)_L$ gauge coupling, lepton flavor
violations, muon anomalous magnetic moment, possibility of dark matter
candidate, neutrino mass matrix satisfying the neutrino oscillation data.
Finally, we search for our allowed parameter region to satisfy all the
constraints, and discuss a possibility of detecting new charged particles at
the large hadron collider.
| [
{
"created": "Tue, 18 Dec 2018 11:47:22 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Apr 2019 02:57:32 GMT",
"version": "v2"
}
] | 2019-06-26 | [
[
"Nomura",
"Takaaki",
""
],
[
"Okada",
"Hiroshi",
""
]
] | We propose a one-loop neutrino mass model with several $SU(2)_L$ multiplet fermions and scalar fields in which the inert feature of a scalar to realize the one-loop neutrino mass can be achieved by the cancellation among Higgs couplings thanks to non-trivial terms in the Higgs potential and to present it in a simpler way. Then we discuss our typical cut-off scale by computing renormalization group equation for $SU(2)_L$ gauge coupling, lepton flavor violations, muon anomalous magnetic moment, possibility of dark matter candidate, neutrino mass matrix satisfying the neutrino oscillation data. Finally, we search for our allowed parameter region to satisfy all the constraints, and discuss a possibility of detecting new charged particles at the large hadron collider. |
hep-ph/0303074 | Domenico Falcone | D. Falcone | Minimal seesaw mechanism | 9 pages, RevTex4. Revised | Phys.Lett. B572 (2003) 50-55 | 10.1016/j.physletb.2003.07.087 | DSF-07/2003 | hep-ph | null | In the framework of the seesaw mechanism, and adopting a typical form for the
Dirac neutrino mass matrix, we discuss the impact of minimal forms of the
Majorana neutrino mass matrix. These matrices contain four or three texture
zeros and only two parameters, a scale factor and a hierarchy parameter. Some
forms are not compatible with large lepton mixing and are ruled out. Moreover,
a normal mass hierarchy for neutrinos is predicted.
| [
{
"created": "Mon, 10 Mar 2003 11:17:12 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Jun 2003 08:13:51 GMT",
"version": "v2"
},
{
"created": "Thu, 19 Jun 2003 10:23:30 GMT",
"version": "v3"
}
] | 2009-11-10 | [
[
"Falcone",
"D.",
""
]
] | In the framework of the seesaw mechanism, and adopting a typical form for the Dirac neutrino mass matrix, we discuss the impact of minimal forms of the Majorana neutrino mass matrix. These matrices contain four or three texture zeros and only two parameters, a scale factor and a hierarchy parameter. Some forms are not compatible with large lepton mixing and are ruled out. Moreover, a normal mass hierarchy for neutrinos is predicted. |
1810.01320 | Emanuele Mereghetti | Emanuele Mereghetti | Electric dipole moments: a theory overview | Talk presented at CIPANP2018 | null | null | CIPANP2018-Mereghetti, LA-UR-18-29338 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Electric dipole moments are extremely sensitive probes of physics beyond the
Standard Model. A vibrant experimental program is in place, with the goal of
improving existing bounds on the electron and neutron electric dipole moments
by one or two orders of magnitude, while testing new ideas for the measurement
of electric dipole moments of light ions, such as the proton and the deuteron,
at a comparable level. The success of this program, and its implications for
physics beyond the Standard Model, relies on the precise calculation of the
electric dipole moments in terms of the couplings of CP-violating operators
induced by beyond-the-Standard-Model physics. In light of the nonperturbative
nature of both QCD at low energy and of the nuclear interactions, these
calculations have proven difficult, and are affected by large theoretical
uncertainties. In this talk I will review the progress that has been achieved
on different aspects of the calculation of hadronic and nuclear EDMs, the
challenges that remain to be faced, and the implications for our understanding
of physics beyond the Standard Model.
| [
{
"created": "Tue, 2 Oct 2018 15:17:38 GMT",
"version": "v1"
}
] | 2018-10-03 | [
[
"Mereghetti",
"Emanuele",
""
]
] | Electric dipole moments are extremely sensitive probes of physics beyond the Standard Model. A vibrant experimental program is in place, with the goal of improving existing bounds on the electron and neutron electric dipole moments by one or two orders of magnitude, while testing new ideas for the measurement of electric dipole moments of light ions, such as the proton and the deuteron, at a comparable level. The success of this program, and its implications for physics beyond the Standard Model, relies on the precise calculation of the electric dipole moments in terms of the couplings of CP-violating operators induced by beyond-the-Standard-Model physics. In light of the nonperturbative nature of both QCD at low energy and of the nuclear interactions, these calculations have proven difficult, and are affected by large theoretical uncertainties. In this talk I will review the progress that has been achieved on different aspects of the calculation of hadronic and nuclear EDMs, the challenges that remain to be faced, and the implications for our understanding of physics beyond the Standard Model. |
2202.07373 | Jin Hu | Jin Hu | Linear mode analysis from spin transport equation | null | null | 10.1103/PhysRevD.106.036004 | null | hep-ph nucl-th | http://creativecommons.org/publicdomain/zero/1.0/ | We provide a linear analysis on normal modes of the spin Boltzmann equation
proposed in \cite{Weickgenannt:2021cuo}, where the non-diagonal or polarized
part of the transition rate is neglected to ensure the Hermitian property of
linearized collision operator. As an instrumental element of spin kinetic
theory, the conservation of total angular momentum is explicitly considered,
thus our analysis is relevant to the recent investigation on the issue of local
spin polarization. By treating the linearized collision operator as an
evolution operator, solving the normal modes turns out a degenerate
perturbation problem in quantum mechanics. The dispersion relations of spinless
modes are in accordance with well-known calculations, while the frequencies of
spin modes are also determined up to second-order in wave vector and the second
order expressions are only formal solutions to be further determined. Moreover,
the relaxation of spin density is related to our linear mode analysis, which
shall play a big role in investigating the issues of the local spin
polarization in the relativistic heavy-ion collisions.
| [
{
"created": "Tue, 15 Feb 2022 12:57:40 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Feb 2022 02:34:32 GMT",
"version": "v2"
},
{
"created": "Mon, 7 Mar 2022 16:09:09 GMT",
"version": "v3"
},
{
"created": "Mon, 20 Jun 2022 14:07:58 GMT",
"version": "v4"
},
{
"cr... | 2022-08-17 | [
[
"Hu",
"Jin",
""
]
] | We provide a linear analysis on normal modes of the spin Boltzmann equation proposed in \cite{Weickgenannt:2021cuo}, where the non-diagonal or polarized part of the transition rate is neglected to ensure the Hermitian property of linearized collision operator. As an instrumental element of spin kinetic theory, the conservation of total angular momentum is explicitly considered, thus our analysis is relevant to the recent investigation on the issue of local spin polarization. By treating the linearized collision operator as an evolution operator, solving the normal modes turns out a degenerate perturbation problem in quantum mechanics. The dispersion relations of spinless modes are in accordance with well-known calculations, while the frequencies of spin modes are also determined up to second-order in wave vector and the second order expressions are only formal solutions to be further determined. Moreover, the relaxation of spin density is related to our linear mode analysis, which shall play a big role in investigating the issues of the local spin polarization in the relativistic heavy-ion collisions. |
1008.0569 | Jo\~ao Moreira | J. Moreira, B. Hiller, A. A. Osipov, A. H. Blin | Thermodynamic potential with correct asymptotics for PNJL model | 16 pages, 5 figures, extended version, title changed | International Journal of Modern Physics A; Vol. 27, No. 00 (2012)
1250060 | 10.1142/S0217751X12500601 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An attempt is made to resolve certain incongruities within the Nambu -
Jona-Lasinio (NJL) and Polyakov loop extended NJL models (PNJL) which currently
are used to extract the thermodynamic characteristics of the quark-gluon
system. It is argued that the most attractive resolution of these incongruities
is the possibility to obtain the thermodynamic potential directly from the
corresponding extremum conditions (gap equations) by integrating them, an
integration constant being fixed in accordance with the Stefan-Boltzmann law.
The advantage of the approach is that the regulator is kept finite both in
divergent and finite valued integrals at finite temperature and chemical
potential. The Pauli-Villars regularization is used, although a standard 3D
sharp cutoff can be applied as well.
| [
{
"created": "Tue, 3 Aug 2010 15:18:37 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Nov 2010 21:07:31 GMT",
"version": "v2"
},
{
"created": "Wed, 14 Sep 2011 11:29:22 GMT",
"version": "v3"
},
{
"created": "Thu, 15 Sep 2011 08:26:55 GMT",
"version": "v4"
}
] | 2012-04-18 | [
[
"Moreira",
"J.",
""
],
[
"Hiller",
"B.",
""
],
[
"Osipov",
"A. A.",
""
],
[
"Blin",
"A. H.",
""
]
] | An attempt is made to resolve certain incongruities within the Nambu - Jona-Lasinio (NJL) and Polyakov loop extended NJL models (PNJL) which currently are used to extract the thermodynamic characteristics of the quark-gluon system. It is argued that the most attractive resolution of these incongruities is the possibility to obtain the thermodynamic potential directly from the corresponding extremum conditions (gap equations) by integrating them, an integration constant being fixed in accordance with the Stefan-Boltzmann law. The advantage of the approach is that the regulator is kept finite both in divergent and finite valued integrals at finite temperature and chemical potential. The Pauli-Villars regularization is used, although a standard 3D sharp cutoff can be applied as well. |
hep-ph/9906371 | Valeri Yudichev | M. K. Volkov, V. L. Yudichev (JINR, Dubna, Russia) | Radially excited scalar, pseudoscalar, and vector meson nonets in a
chiral quark model | LaTeX, 56 pages, 6 figures, psfig; Submitted to Phys. Part. Nuclei | Phys.Part.Nucl. 31 (2000) 282-311; Fiz.Elem.Chast.Atom.Yadra 31
(2000) 576-633 | null | null | hep-ph | null | A chiral Lagrangian containing, besides the usual meson fields, their first
radial excitations is constructed. The Lagrangian is derived by bosonization of
a Nambu--Jona-Lasinio (NJL) type quark model with separable nonlocal
interactions. The nonlocality is described by form factors corresponding to
3-dimensional excited state wave functions. The spontaneous breaking of chiral
symmetry is governed by the standard NJL gap equations. A simple SU(2)xSU(2)
version of the model is used to demonstrate all low-energy theorems to hold
valid in the chiral limit. A more realistic U(3)xU(3) model with 't Hooft
interaction is constructed to describe the mass spectrum of excited scalar,
pseudoscalar, and vector mesons. On the basis of global chiral symmetry, we use
the same form factors for the scalar and pseudoscalar mesons. Having fixed the
form factor parameters by masses of pseudoscalar mesons, we predict the mass
spectrum of scalar mesons. This allows us to interpret experimentally observed
scalar, pseudoscalar, and vector meson states as members of quark-antiquark
nonets. It is shown that the a_0(1450), K^*_0(1430), f_0(1370), f_J(1710)
scalar meson states are the first radial excitations of the ground states:
a_0(980), K^*_0(960), f_0(400-1200), f_0(980). The weak decay constants F_\pi,
F_{\pi'}, F_K, F_{K'} and the main strong decay widths of the scalar,
pseudoscalar, and vector meson nonets are calculated.
| [
{
"created": "Tue, 15 Jun 1999 17:10:58 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Volkov",
"M. K.",
"",
"JINR, Dubna, Russia"
],
[
"Yudichev",
"V. L.",
"",
"JINR, Dubna, Russia"
]
] | A chiral Lagrangian containing, besides the usual meson fields, their first radial excitations is constructed. The Lagrangian is derived by bosonization of a Nambu--Jona-Lasinio (NJL) type quark model with separable nonlocal interactions. The nonlocality is described by form factors corresponding to 3-dimensional excited state wave functions. The spontaneous breaking of chiral symmetry is governed by the standard NJL gap equations. A simple SU(2)xSU(2) version of the model is used to demonstrate all low-energy theorems to hold valid in the chiral limit. A more realistic U(3)xU(3) model with 't Hooft interaction is constructed to describe the mass spectrum of excited scalar, pseudoscalar, and vector mesons. On the basis of global chiral symmetry, we use the same form factors for the scalar and pseudoscalar mesons. Having fixed the form factor parameters by masses of pseudoscalar mesons, we predict the mass spectrum of scalar mesons. This allows us to interpret experimentally observed scalar, pseudoscalar, and vector meson states as members of quark-antiquark nonets. It is shown that the a_0(1450), K^*_0(1430), f_0(1370), f_J(1710) scalar meson states are the first radial excitations of the ground states: a_0(980), K^*_0(960), f_0(400-1200), f_0(980). The weak decay constants F_\pi, F_{\pi'}, F_K, F_{K'} and the main strong decay widths of the scalar, pseudoscalar, and vector meson nonets are calculated. |
hep-ph/9601351 | Torbjorn Sjostrand | T. Sjostrand, J.K. Storrow and A. Vogt | Parton distributions of real and virtual photons | 10 pages, LaTeX, 4 eps figures included in file using filecontents
environments | J.Phys.G22:893-902,1996 | 10.1088/0954-3899/22/6/022 | LU TP 96-5 and MC-TH-96/04 | hep-ph | null | Recent progress on the parton distribution functions of the photon, both real
and virtual, is briefly reviewed and experimental possibilities at HERA are
discussed.
| [
{
"created": "Mon, 29 Jan 1996 10:15:13 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Sjostrand",
"T.",
""
],
[
"Storrow",
"J. K.",
""
],
[
"Vogt",
"A.",
""
]
] | Recent progress on the parton distribution functions of the photon, both real and virtual, is briefly reviewed and experimental possibilities at HERA are discussed. |
1710.00418 | Walter Wilcox | Suman Baral and Walter Wilcox | The Thomas-Fermi quark model and mesonic matter | 8 pages, 9 figures, Talk presented at the APS Division of Particles
and Fields Meeting (DPF 2017), July 31-August 4, 2017, Fermilab. C170731 | null | null | BU-HEPP-17-02 | hep-ph hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The first results of a new application of the Thomas-Fermi statistical quark
model to mesonic matter is presented. Interesting aspects of the theory are
discussed, distinguishing such states from baryonic matter. A major motivation
of this study is the tetraquark states discovered by the Belle and other
collaborations and the possibility that stable multi-quark families of such
states exist. Similar to our previous baryonic study, we use a two-inequivalent
wave function approach to investigate aspects of multi-quark matter. We think
of our model as a tool for quickly assessing the characteristics of new,
possibly bound, particle states of higher quark number content, which can not
yet be examined by lattice methods.
| [
{
"created": "Sun, 1 Oct 2017 21:45:52 GMT",
"version": "v1"
}
] | 2017-10-03 | [
[
"Baral",
"Suman",
""
],
[
"Wilcox",
"Walter",
""
]
] | The first results of a new application of the Thomas-Fermi statistical quark model to mesonic matter is presented. Interesting aspects of the theory are discussed, distinguishing such states from baryonic matter. A major motivation of this study is the tetraquark states discovered by the Belle and other collaborations and the possibility that stable multi-quark families of such states exist. Similar to our previous baryonic study, we use a two-inequivalent wave function approach to investigate aspects of multi-quark matter. We think of our model as a tool for quickly assessing the characteristics of new, possibly bound, particle states of higher quark number content, which can not yet be examined by lattice methods. |
1705.09214 | Matheus Hostert | Peter Ballett, Matheus Hostert and Silvia Pascoli | Light Sterile Neutrinos at $\nu$STORM: Decoherence and CP violation | Poster presented at NuPhys2016 (London, 12-14 December 2016). 4
pages, LaTeX, 7 figures | null | null | NuPhys2016-Hostert | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Light sterile neutrino oscillations can be partially or completely washed out
at short-baseline experiments due to the breaking of neutrino production
coherence. In this work we address this issue in sterile searches at
$\nu$STORM, an experimental proposal for a beam of neutrinos from the decay of
stored muons. We work with 3+1 and 3+2 models, the latter introducing CP
violation at short-baselines. We find that decoherence effects are only
relevant for sterile masses above $\Delta m^2 \gtrsim 10$ eV$^2$, and that,
even in that regime, we are able to place strong appearance bounds in such
clean environments. In addition, the novel signatures of CP violation in the
parameter space of interest can be identified with a significance of up to
$\gtrsim 3 \sigma$.
| [
{
"created": "Thu, 25 May 2017 15:09:23 GMT",
"version": "v1"
}
] | 2017-05-26 | [
[
"Ballett",
"Peter",
""
],
[
"Hostert",
"Matheus",
""
],
[
"Pascoli",
"Silvia",
""
]
] | Light sterile neutrino oscillations can be partially or completely washed out at short-baseline experiments due to the breaking of neutrino production coherence. In this work we address this issue in sterile searches at $\nu$STORM, an experimental proposal for a beam of neutrinos from the decay of stored muons. We work with 3+1 and 3+2 models, the latter introducing CP violation at short-baselines. We find that decoherence effects are only relevant for sterile masses above $\Delta m^2 \gtrsim 10$ eV$^2$, and that, even in that regime, we are able to place strong appearance bounds in such clean environments. In addition, the novel signatures of CP violation in the parameter space of interest can be identified with a significance of up to $\gtrsim 3 \sigma$. |
1307.6824 | Arman Esmaili | Arman Esmaili and Alexei Yu. Smirnov | Restricting the LSND and MiniBooNE sterile neutrinos with the IceCube
atmospheric neutrino data | 30 pages, 10 figures; v3: several clarifications added, figures
added, references added, matches the version published in JHEP | JHEP12(2013)014 | 10.1007/JHEP12(2013)014 | null | hep-ph astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study oscillations of the high energy atmospheric neutrinos in the Earth
into sterile neutrinos with the eV-scale mass. The MSW resonance and parametric
enhancement of the $\bar{\nu}_\mu\to\bar{\nu}_s$ oscillations lead to
distortion of the zenith angle distribution of the muon-track events which can
be observed by IceCube. Due to matter effect, the IceCube signal depends not
only on the mixing element $U_{\mu 4}$ relevant for LSND and MiniBooNE but also
on $U_{\tau 4}$ and the CP-violating phase $\delta_{24}$. We show that the case
with $U_{\tau 4} = \delta_{24} = 0$ leads to the weakest IceCube signal and
therefore should be used to bound $U_{\mu 4}$. We compute the zenith angle
distributions of the $\nu_\mu-$events for different energy intervals in the
range (0.1 - 10) TeV and find that inclusion of the energy information (binning
in energy) improves the sensitivity to $\nu_s$ drastically. We estimate that
with already collected (during 3 - 4 years) IceCube statistics the bound
$|U_{\mu 4}|^2 < 0.01$ ($99\%$ C.L.) can be established and the mixing required
by LSND and MiniBooNE can be excluded at $(4 - 6) \sigma$ confidence level.
| [
{
"created": "Thu, 25 Jul 2013 17:50:17 GMT",
"version": "v1"
},
{
"created": "Fri, 26 Jul 2013 20:00:40 GMT",
"version": "v2"
},
{
"created": "Thu, 5 Dec 2013 16:13:21 GMT",
"version": "v3"
}
] | 2015-06-16 | [
[
"Esmaili",
"Arman",
""
],
[
"Smirnov",
"Alexei Yu.",
""
]
] | We study oscillations of the high energy atmospheric neutrinos in the Earth into sterile neutrinos with the eV-scale mass. The MSW resonance and parametric enhancement of the $\bar{\nu}_\mu\to\bar{\nu}_s$ oscillations lead to distortion of the zenith angle distribution of the muon-track events which can be observed by IceCube. Due to matter effect, the IceCube signal depends not only on the mixing element $U_{\mu 4}$ relevant for LSND and MiniBooNE but also on $U_{\tau 4}$ and the CP-violating phase $\delta_{24}$. We show that the case with $U_{\tau 4} = \delta_{24} = 0$ leads to the weakest IceCube signal and therefore should be used to bound $U_{\mu 4}$. We compute the zenith angle distributions of the $\nu_\mu-$events for different energy intervals in the range (0.1 - 10) TeV and find that inclusion of the energy information (binning in energy) improves the sensitivity to $\nu_s$ drastically. We estimate that with already collected (during 3 - 4 years) IceCube statistics the bound $|U_{\mu 4}|^2 < 0.01$ ($99\%$ C.L.) can be established and the mixing required by LSND and MiniBooNE can be excluded at $(4 - 6) \sigma$ confidence level. |
2302.12906 | Armand Rousselot | Armand Rousselot and Michael Spannowsky | Generative Invertible Quantum Neural Networks | 18 pages, 7 figures Changes in v2: Add references 49-51, provided
gitlab link to code repository Changes in v3: Incorporate rebuttal from
https://scipost.org/submissions/2302.12906v2/ | SciPost Phys. 16, 146 (2024) | 10.21468/SciPostPhys.16.6.146 | IPPP/23/10 | hep-ph cs.AI cs.LG quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Invertible Neural Networks (INN) have become established tools for the
simulation and generation of highly complex data. We propose a quantum-gate
algorithm for a Quantum Invertible Neural Network (QINN) and apply it to the
LHC data of jet-associated production of a Z-boson that decays into leptons, a
standard candle process for particle collider precision measurements. We
compare the QINN's performance for different loss functions and training
scenarios. For this task, we find that a hybrid QINN matches the performance of
a significantly larger purely classical INN in learning and generating complex
data.
| [
{
"created": "Fri, 24 Feb 2023 21:25:07 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Mar 2023 11:17:58 GMT",
"version": "v2"
},
{
"created": "Thu, 22 Feb 2024 15:55:13 GMT",
"version": "v3"
}
] | 2024-06-05 | [
[
"Rousselot",
"Armand",
""
],
[
"Spannowsky",
"Michael",
""
]
] | Invertible Neural Networks (INN) have become established tools for the simulation and generation of highly complex data. We propose a quantum-gate algorithm for a Quantum Invertible Neural Network (QINN) and apply it to the LHC data of jet-associated production of a Z-boson that decays into leptons, a standard candle process for particle collider precision measurements. We compare the QINN's performance for different loss functions and training scenarios. For this task, we find that a hybrid QINN matches the performance of a significantly larger purely classical INN in learning and generating complex data. |
1811.08876 | Li-Ping He | Eric Braaten, Li-Ping He, Kevin Ingles | Estimates of the $X(3872)$ Cross Section at a Hadron Collider | 14 pages, 1 figure. Extensively revised to focus mainly on the
production of $X(3872)$ at hadron colliders. Material on production of
$X(3872)$ plus a pion was removed. Text overlap with arXiv:1903:04355 | Phys. Rev. D 100, 094024 (2019) | 10.1103/PhysRevD.100.094024 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The claim that the $X(3872)$ meson cannot be a charm-meson molecule because
its prompt production cross section at hadron colliders is too large is based
on an upper bound in terms of a cross section for producing charm-meson pairs.
Assuming $X$ is sufficiently weakly bound, we derive an equality between the
$X$ cross section and a charm-meson pair cross section that takes into account
the threshold enhancement from the $X$ resonance. The cross section for
producing $X$ is equal to that for producing $D^{*0} \bar{D}^0$ integrated up
to a relative momentum $k_\mathrm{max} = 7.7\,\gamma_X$, where $\gamma_X$ is
the binding momentum of $X$. We also derive an order-of-magnitude estimate of
the $X$ cross section in terms of a naive charm-meson pair cross section that
does not take into account the threshold enhancement, such as that produced by
a Monte Carlo event generator. The cross section for producing $X$ can be
approximated by the naive cross section for producing $D^{*0} \bar{D}^0$
integrated up to a relative momentum $k_\mathrm{max}$ of order $(m_\pi^2
\gamma_X)^{1/3}$. The estimates of the prompt $X$ cross section at hadron
colliders are consistent with the cross sections observed at the Tevatron and
the LHC.
| [
{
"created": "Wed, 21 Nov 2018 18:46:39 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Oct 2019 15:03:27 GMT",
"version": "v2"
}
] | 2019-11-28 | [
[
"Braaten",
"Eric",
""
],
[
"He",
"Li-Ping",
""
],
[
"Ingles",
"Kevin",
""
]
] | The claim that the $X(3872)$ meson cannot be a charm-meson molecule because its prompt production cross section at hadron colliders is too large is based on an upper bound in terms of a cross section for producing charm-meson pairs. Assuming $X$ is sufficiently weakly bound, we derive an equality between the $X$ cross section and a charm-meson pair cross section that takes into account the threshold enhancement from the $X$ resonance. The cross section for producing $X$ is equal to that for producing $D^{*0} \bar{D}^0$ integrated up to a relative momentum $k_\mathrm{max} = 7.7\,\gamma_X$, where $\gamma_X$ is the binding momentum of $X$. We also derive an order-of-magnitude estimate of the $X$ cross section in terms of a naive charm-meson pair cross section that does not take into account the threshold enhancement, such as that produced by a Monte Carlo event generator. The cross section for producing $X$ can be approximated by the naive cross section for producing $D^{*0} \bar{D}^0$ integrated up to a relative momentum $k_\mathrm{max}$ of order $(m_\pi^2 \gamma_X)^{1/3}$. The estimates of the prompt $X$ cross section at hadron colliders are consistent with the cross sections observed at the Tevatron and the LHC. |
2103.08680 | Xiaohui Liu | Hao-yu Liu, Xiaohui Liu and Sven-Olaf Moch | Anti-$k_T$ jet function at next-to-next-to-leading order | 12 pages, update the references, add a plot to demonstrate the fully
differential nature of the calculated jet function, match the punished
version, corrected an unnecessary approximation, numbers updated | Phys. Rev. D 104, 014016 (2021) | 10.1103/PhysRevD.104.014016 | DESY 21-032 | hep-ph nucl-th | http://creativecommons.org/licenses/by/4.0/ | Jets constructed via clustering algorithms (e.g., anti-$k_T$, soft-drop) have
been proposed for many precision measurements, such as the strong coupling
$\alpha_s$ and the nucleon intrinsic dynamics. However, the theoretical
accuracy is affected by missing QCD corrections at higher orders for the jet
functions in the associated factorization theorems. Their calculation is
complicated by the jet clustering procedure. In this work, we propose a method
to evaluate jet functions at higher orders in QCD. The calculation involves the
phase space sector decomposition with suitable soft subtractions. As a concrete
example, we present the quark-jet function using the anti-$k_T$ algorithm with
E-scheme recombination at next-to-next-to-leading order.
| [
{
"created": "Mon, 15 Mar 2021 19:50:57 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Jul 2021 12:21:28 GMT",
"version": "v2"
},
{
"created": "Sun, 13 Nov 2022 16:23:30 GMT",
"version": "v3"
}
] | 2022-11-15 | [
[
"Liu",
"Hao-yu",
""
],
[
"Liu",
"Xiaohui",
""
],
[
"Moch",
"Sven-Olaf",
""
]
] | Jets constructed via clustering algorithms (e.g., anti-$k_T$, soft-drop) have been proposed for many precision measurements, such as the strong coupling $\alpha_s$ and the nucleon intrinsic dynamics. However, the theoretical accuracy is affected by missing QCD corrections at higher orders for the jet functions in the associated factorization theorems. Their calculation is complicated by the jet clustering procedure. In this work, we propose a method to evaluate jet functions at higher orders in QCD. The calculation involves the phase space sector decomposition with suitable soft subtractions. As a concrete example, we present the quark-jet function using the anti-$k_T$ algorithm with E-scheme recombination at next-to-next-to-leading order. |
hep-ph/0207065 | Namit Mahajan | Namit Mahajan (Univ. of Delhi) | $\tau$ polarization and Randall-Sundrum scenario at $e^+e^-$ colliders | 7 page Latex including 3 postscript figures. Needs axodraw | J.Phys.G29:2677-2684,2003 | 10.1088/0954-3899/29/12/001 | null | hep-ph | null | We study polarized cross-sections and forward-backward asymmetry for the
process $e^+e-\to \tau^+\tau^-$ in the stabilized Randall-Sundrum scenario. It
is shown that there is substantial deviation from the Standard Model
predictions, both in terms of the actual numerical values and angular
distributions.
| [
{
"created": "Thu, 4 Jul 2002 09:22:08 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Mahajan",
"Namit",
"",
"Univ. of Delhi"
]
] | We study polarized cross-sections and forward-backward asymmetry for the process $e^+e-\to \tau^+\tau^-$ in the stabilized Randall-Sundrum scenario. It is shown that there is substantial deviation from the Standard Model predictions, both in terms of the actual numerical values and angular distributions. |
1605.08183 | Yuchen Guo | Yu-Chen Guo, Chong-Xing Yue and Zhen-hua Zhao | 750 GeV diphoton excess confronted with a top-pion in the TTM model | 12 pages, 3 figures, Int. J. Mod. Phys. A (2016) | Int. J. Mod. Phys. A 31, 1650086 (2016) | 10.1142/S0217751X1650086X | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The latest LHC data suggest an intriguing excess at $m_{\gamma\gamma} = 750$
GeV which apparently requires an explanation from the beyond standard model
physics. In this note we explore the possibility for this signal to arise from
a top-pion in the Top Triangle Moose model which can be viewed as a
dimensional-deconstruction version of the top-color assisted technicolor model.
We demonstrate that the observed excess can be accommodated by and has
important implications for this interesting model.
| [
{
"created": "Thu, 26 May 2016 07:56:29 GMT",
"version": "v1"
},
{
"created": "Sat, 28 May 2016 01:47:24 GMT",
"version": "v2"
},
{
"created": "Mon, 6 Jun 2016 13:38:28 GMT",
"version": "v3"
}
] | 2016-06-14 | [
[
"Guo",
"Yu-Chen",
""
],
[
"Yue",
"Chong-Xing",
""
],
[
"Zhao",
"Zhen-hua",
""
]
] | The latest LHC data suggest an intriguing excess at $m_{\gamma\gamma} = 750$ GeV which apparently requires an explanation from the beyond standard model physics. In this note we explore the possibility for this signal to arise from a top-pion in the Top Triangle Moose model which can be viewed as a dimensional-deconstruction version of the top-color assisted technicolor model. We demonstrate that the observed excess can be accommodated by and has important implications for this interesting model. |
hep-ph/9801242 | null | Amitava Datta, Aseshkrishna Datta and M.K. Parida | Signatures of Non-Universal Soft Breaking Sfermion Masses at Hadron
Colliders | 17 pages, two ps figures, LaTeX format | Phys.Lett. B431 (1998) 347-353 | 10.1016/S0370-2693(98)00507-3 | null | hep-ph | null | We identify several mass patterns, within the framework of N=1 SUGRA with
nonuniversal soft breaking masses for the sfermions, which may significantly
alter SUSY signals and the current squark-gluino mass limits from the Tevatron.
These effects are illustrated in a SO(10) SUSY GUT with an intermediate mass
scale, but the conclusions are also valid in SUSY SO(10) models with grand
deserts.
| [
{
"created": "Thu, 8 Jan 1998 09:44:33 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Datta",
"Amitava",
""
],
[
"Datta",
"Aseshkrishna",
""
],
[
"Parida",
"M. K.",
""
]
] | We identify several mass patterns, within the framework of N=1 SUGRA with nonuniversal soft breaking masses for the sfermions, which may significantly alter SUSY signals and the current squark-gluino mass limits from the Tevatron. These effects are illustrated in a SO(10) SUSY GUT with an intermediate mass scale, but the conclusions are also valid in SUSY SO(10) models with grand deserts. |
2010.08451 | Tyler Corbett | Tyler Corbett, Michael Trott | One loop verification of SMEFT Ward Identities | 40 pages, 1 Figure | SciPost Phys. 10, 144 (2021) | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We verify Standard Model Effective Field Theory Ward identities to one loop
order when background field gauge is used to quantize the theory. The results
we present lay the foundation of next to leading order automatic generation of
results in the SMEFT, in both the perturbative and non-perturbative expansion
using the geoSMEFT formalism, and background field gauge.
| [
{
"created": "Fri, 16 Oct 2020 15:28:58 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Jun 2021 10:35:45 GMT",
"version": "v2"
}
] | 2021-06-23 | [
[
"Corbett",
"Tyler",
""
],
[
"Trott",
"Michael",
""
]
] | We verify Standard Model Effective Field Theory Ward identities to one loop order when background field gauge is used to quantize the theory. The results we present lay the foundation of next to leading order automatic generation of results in the SMEFT, in both the perturbative and non-perturbative expansion using the geoSMEFT formalism, and background field gauge. |
1603.01256 | Chien-Yi Chen | Chien-Yi Chen, Michel Lefebvre, Maxim Pospelov, Yi-Ming Zhong | Diphoton Excess through Dark Mediators | 38 pages, 7 figures, 2 tables, references added | null | 10.1007/JHEP07(2016)063 | YITP-SB-16-05 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Preliminary ATLAS and CMS results from the first 13 TeV LHC run have
encountered an intriguing excess of events in the diphoton channel around the
invariant mass of 750 GeV. We investigate a possibility that the current excess
is due to a heavy resonance decaying to light metastable states, which in turn
give displaced decays to very highly collimated $e^+e^-$ pairs. Such decays may
pass the photon selection criteria, and successfully mimic the diphoton events,
especially at low counts. We investigate two classes of such models,
characterized by the following underlying production and decay chains: $gg \to
S\to A'A'\to (e^+e^-)(e^+e^-)$ and $q\bar q \to Z' \to sa\to (e^+e^-)(e^+e^-)$,
where at the first step a heavy scalar, $S$, or vector, $Z'$, resonances are
produced that decay to light metastable vectors, $A'$, or (pseudo-)scalars, $s$
and $a$. Setting the parameters of the models to explain the existing excess,
and taking the ATLAS detector geometry into account, we marginalize over the
properties of heavy resonances in order to derive the expected lifetimes and
couplings of metastable light resonances. We observe that in the case of $A'$,
the suggested range of masses and mixing angles $\epsilon$ is within reach of
several new-generation intensity frontier experiments.
| [
{
"created": "Thu, 3 Mar 2016 20:56:19 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Apr 2016 19:55:40 GMT",
"version": "v2"
}
] | 2016-08-24 | [
[
"Chen",
"Chien-Yi",
""
],
[
"Lefebvre",
"Michel",
""
],
[
"Pospelov",
"Maxim",
""
],
[
"Zhong",
"Yi-Ming",
""
]
] | Preliminary ATLAS and CMS results from the first 13 TeV LHC run have encountered an intriguing excess of events in the diphoton channel around the invariant mass of 750 GeV. We investigate a possibility that the current excess is due to a heavy resonance decaying to light metastable states, which in turn give displaced decays to very highly collimated $e^+e^-$ pairs. Such decays may pass the photon selection criteria, and successfully mimic the diphoton events, especially at low counts. We investigate two classes of such models, characterized by the following underlying production and decay chains: $gg \to S\to A'A'\to (e^+e^-)(e^+e^-)$ and $q\bar q \to Z' \to sa\to (e^+e^-)(e^+e^-)$, where at the first step a heavy scalar, $S$, or vector, $Z'$, resonances are produced that decay to light metastable vectors, $A'$, or (pseudo-)scalars, $s$ and $a$. Setting the parameters of the models to explain the existing excess, and taking the ATLAS detector geometry into account, we marginalize over the properties of heavy resonances in order to derive the expected lifetimes and couplings of metastable light resonances. We observe that in the case of $A'$, the suggested range of masses and mixing angles $\epsilon$ is within reach of several new-generation intensity frontier experiments. |
1709.08175 | Byung-Geel Yu | Byung-Geel Yu and Kook-Jin Kong | Regge phenomenology of photoproduction of $\pi^-\Delta^{++}$ and scaling
with saturation of trajectory | 5 pages 6 figures | null | 10.1134/S1547477118040076 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we investigate the reaction $\gamma p\to\pi^-\Delta^{++}$ in the
Reggeized model for $\pi(138)+\rho(775)+a_2(1320)$ exchanges in the
$t$-channel. For a convergence of the reaction cross section at high energies
the minimal forms of proton and $\Delta^{++}$ exchanges are introduced in the
direct and crossed channels for gauge invariance of $\pi$ Regge-pole exchange.
The role of spin-2 tensor meson $a_2$ is found to be crucial to agree with
existing data at high energies. Electromagnetic multipoles of $\Delta^{++}$
baryon are analyzed in the $\Delta$ resonance region. Based on the constituents
counting rule the scaled differential cross section at $E_\gamma=4$ GeV is
reproduced with the Regge trajectory saturated at large momentum transfer $-t$.
| [
{
"created": "Sun, 24 Sep 2017 10:13:58 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Oct 2017 21:10:30 GMT",
"version": "v2"
}
] | 2018-08-01 | [
[
"Yu",
"Byung-Geel",
""
],
[
"Kong",
"Kook-Jin",
""
]
] | In this work we investigate the reaction $\gamma p\to\pi^-\Delta^{++}$ in the Reggeized model for $\pi(138)+\rho(775)+a_2(1320)$ exchanges in the $t$-channel. For a convergence of the reaction cross section at high energies the minimal forms of proton and $\Delta^{++}$ exchanges are introduced in the direct and crossed channels for gauge invariance of $\pi$ Regge-pole exchange. The role of spin-2 tensor meson $a_2$ is found to be crucial to agree with existing data at high energies. Electromagnetic multipoles of $\Delta^{++}$ baryon are analyzed in the $\Delta$ resonance region. Based on the constituents counting rule the scaled differential cross section at $E_\gamma=4$ GeV is reproduced with the Regge trajectory saturated at large momentum transfer $-t$. |
0810.4449 | Bruno Machet | Quentin Duret (LPTHE), Bruno Machet (LPTHE), M. I. Vysotsky (ITEP) | Quark Lagrangian diagonalization versus non-diagonal kinetic terms | 2 pages, 1 figure | Modern Physics Letters A 24, 4 (2009) 273-275 | 10.1142/S0217732309030084 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Loop corrections induce a dependence on the momentum squared of the
coefficients of the Standard Model Lagrangian, making highly non-trivial (or
even impossible) the diagonalization of its quadratic part. Fortunately, the
introduction of appropriate counterterms solves this puzzle.
| [
{
"created": "Fri, 24 Oct 2008 13:10:13 GMT",
"version": "v1"
}
] | 2009-07-06 | [
[
"Duret",
"Quentin",
"",
"LPTHE"
],
[
"Machet",
"Bruno",
"",
"LPTHE"
],
[
"Vysotsky",
"M. I.",
"",
"ITEP"
]
] | Loop corrections induce a dependence on the momentum squared of the coefficients of the Standard Model Lagrangian, making highly non-trivial (or even impossible) the diagonalization of its quadratic part. Fortunately, the introduction of appropriate counterterms solves this puzzle. |
1105.0376 | Danny van Dyk | Christoph Bobeth, Gudrun Hiller and Danny van Dyk | More Benefits of Semileptonic Rare B Decays at Low Recoil: CP Violation | 18 pages, 3 fig.; 1 reference and comment on higher order effects
added; EOS link fixed. Minor adjustments to Eqs 4.1-4.3 to match the (lower)
q^2-cut as given in paper. Main results and conclusions unchanged; v3+v4:
treatment of exp. uncert. in likelihood-function in EOS fixed and constraints
from scan on C9,C10 updated (Fig 2,3 and Eqs 3.2,3.3). Main results and
conclusions absolutely unchanged | JHEP 1107:067,2011 | 10.1007/JHEP07(2011)067 | DO-TH 10/16 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a systematic analysis of the angular distribution of Bbar ->
Kbar^\ast (-> Kbar pi) l^+ l^- decays with l = e, mu in the low recoil region
(i.e. at high dilepton invariant masses of the order of the mass of the
b-quark) to account model-independently for CP violation beyond the Standard
Model, working to next-to-leading order QCD. From the employed heavy quark
effective theory framework we identify the key CP observables with reduced
hadronic uncertainties. Since some of the CP asymmetries are CP-odd they can be
measured without B-flavour tagging. This is particularly beneficial for
Bbar_s,B_s -> phi(-> K^+ K^-) l^+ l^- decays, which are not self-tagging, and
we work out the corresponding time-integrated CP asymmetries. Presently
available experimental constraints allow the proposed CP asymmetries to be
sizeable, up to values of the order ~ 0.2, while the corresponding Standard
Model values receive a strong parametric suppression at the level of O(10^-4).
Furthermore, we work out the allowed ranges of the short-distance (Wilson)
coefficients C_9,C_10 in the presence of CP violation beyond the Standard Model
but no further Dirac structures. We find the Bbar_s -> mu^+ mu^- branching
ratio to be below 9*10^-9 (at 95% CL). Possibilities to check the performance
of the theoretical low recoil framework are pointed out.
| [
{
"created": "Mon, 2 May 2011 16:36:30 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Jul 2011 13:10:56 GMT",
"version": "v2"
},
{
"created": "Wed, 5 Oct 2011 13:40:33 GMT",
"version": "v3"
},
{
"created": "Thu, 8 Dec 2011 14:40:02 GMT",
"version": "v4"
}
] | 2011-12-09 | [
[
"Bobeth",
"Christoph",
""
],
[
"Hiller",
"Gudrun",
""
],
[
"van Dyk",
"Danny",
""
]
] | We present a systematic analysis of the angular distribution of Bbar -> Kbar^\ast (-> Kbar pi) l^+ l^- decays with l = e, mu in the low recoil region (i.e. at high dilepton invariant masses of the order of the mass of the b-quark) to account model-independently for CP violation beyond the Standard Model, working to next-to-leading order QCD. From the employed heavy quark effective theory framework we identify the key CP observables with reduced hadronic uncertainties. Since some of the CP asymmetries are CP-odd they can be measured without B-flavour tagging. This is particularly beneficial for Bbar_s,B_s -> phi(-> K^+ K^-) l^+ l^- decays, which are not self-tagging, and we work out the corresponding time-integrated CP asymmetries. Presently available experimental constraints allow the proposed CP asymmetries to be sizeable, up to values of the order ~ 0.2, while the corresponding Standard Model values receive a strong parametric suppression at the level of O(10^-4). Furthermore, we work out the allowed ranges of the short-distance (Wilson) coefficients C_9,C_10 in the presence of CP violation beyond the Standard Model but no further Dirac structures. We find the Bbar_s -> mu^+ mu^- branching ratio to be below 9*10^-9 (at 95% CL). Possibilities to check the performance of the theoretical low recoil framework are pointed out. |
1809.05424 | Rafal Maciula | Victor P. Goncalves, Rafal Maciula, and Antoni Szczurek | From $D_{s}^{\pm}$ production asymmetry at the LHC to prompt
$\nu_{\tau}$ at IceCube | 6 pages, 3 figures | null | 10.1016/j.physletb.2019.05.026 | null | hep-ph astro-ph.HE hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The description of the heavy meson production at large energies and forward
rapidities at the LHC is fundamental to derive realistic predictions of the
prompt atmospheric neutrino flux at the IceCube Observatory. In particular, the
prompt tau neutrino flux is determined by the decay of $D_s$ mesons produced in
cosmic ray - air interactions at high energies and large values of the Feynman
- $x_F$ variable. Recent data from the LHCb Collaboration indicate a production
asymmetry for $D_s^+$ and $D_s^-$ mesons, which cannot be explained in terms of
the standard modelling of the hadronization process. In this paper we
demonstrate that this asymmetry can be described assuming an asymmetric strange
sea ($s(x) \ne \bar s(x)$) in the proton wave function and taking into account
of the charm and strange fragmentation into $D_s$ mesons. Moreover, we show
that the strange quark fragmentation contribution is dominant at large - $x_F$
($\ge 0.3$). The prompt $\nu_{\tau}$ flux is calculated and the enhancement
associated to the strange quark fragmentation contribution, disregarded in
previous calculations, is estimated.
| [
{
"created": "Fri, 14 Sep 2018 13:52:27 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Sep 2018 10:39:39 GMT",
"version": "v2"
}
] | 2019-06-26 | [
[
"Goncalves",
"Victor P.",
""
],
[
"Maciula",
"Rafal",
""
],
[
"Szczurek",
"Antoni",
""
]
] | The description of the heavy meson production at large energies and forward rapidities at the LHC is fundamental to derive realistic predictions of the prompt atmospheric neutrino flux at the IceCube Observatory. In particular, the prompt tau neutrino flux is determined by the decay of $D_s$ mesons produced in cosmic ray - air interactions at high energies and large values of the Feynman - $x_F$ variable. Recent data from the LHCb Collaboration indicate a production asymmetry for $D_s^+$ and $D_s^-$ mesons, which cannot be explained in terms of the standard modelling of the hadronization process. In this paper we demonstrate that this asymmetry can be described assuming an asymmetric strange sea ($s(x) \ne \bar s(x)$) in the proton wave function and taking into account of the charm and strange fragmentation into $D_s$ mesons. Moreover, we show that the strange quark fragmentation contribution is dominant at large - $x_F$ ($\ge 0.3$). The prompt $\nu_{\tau}$ flux is calculated and the enhancement associated to the strange quark fragmentation contribution, disregarded in previous calculations, is estimated. |
1912.03142 | Tiziano Peraro | Tiziano Peraro | Analytic multi-loop results using finite fields and dataflow graphs with
FiniteFlow | 10 pages, 3 figures, Contribution to the proceedings of the
RADCOR2019 conference, 9-13 September 2019, Avignon, France | null | null | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | FiniteFlow is a public framework for defining and executing numerical
algorithms over finite fields and reconstructing multivariate rational
functions. The framework allows to build complex algorithms by combining basic
building blocks into graphical representations of the calculation, known as
dataflow graphs. It offers an easy-to-use Mathematica interface for
implementing efficient custom algorithms without any low-level coding. We
report on some new features of FiniteFlow which have been published after its
initial release, give some simple example of usage for common tasks and review
recent cutting-edge applications to two-loop five-point scattering and the
four-loop cusp anomalous dimension.
| [
{
"created": "Fri, 6 Dec 2019 14:21:19 GMT",
"version": "v1"
}
] | 2019-12-09 | [
[
"Peraro",
"Tiziano",
""
]
] | FiniteFlow is a public framework for defining and executing numerical algorithms over finite fields and reconstructing multivariate rational functions. The framework allows to build complex algorithms by combining basic building blocks into graphical representations of the calculation, known as dataflow graphs. It offers an easy-to-use Mathematica interface for implementing efficient custom algorithms without any low-level coding. We report on some new features of FiniteFlow which have been published after its initial release, give some simple example of usage for common tasks and review recent cutting-edge applications to two-loop five-point scattering and the four-loop cusp anomalous dimension. |
2407.21120 | Wen Chen | Long-Bin Chen, Wen Chen, Feng Feng, Yu Jia | Confronting perturbative QCD with the hardest exclusive reactions: kaon
electromagnetic form factors | 10 pages, 2 tables, 4 figures. Ancillary file containing
hard-scattering kernels through NNLO | null | null | null | hep-ph hep-ex hep-lat | http://creativecommons.org/licenses/by/4.0/ | Among countless channels of hard exclusive reactions, the kaon
electromagnetic form factors (EMFFs) are of special interest, which have been
measured up to $Q^2 \sim 50\;{\rm GeV}^2$ in the timelike domain. The kaon
EMFFs thereby serve an ideal platform to critically examine the validity and
effectiveness of perturbative QCD (pQCD) in accounting for hard exclusive
processes. In this work we confront the pQCD predictions that incorporate the
next-to-next-to-leading-order (NNLO) perturbative corrections, with the
available kaon EMFFs data set from experimental measurements and from lattice
predictions. The inclusion of the NNLO corrections turns out to have a
substantial and positive impact. If the profiles of the kaon light-cone
distribution amplitudes (LCDAs) are taken from the recent lattice QCD
prediction by {\tt LPC} Collaboration, the satisfactory agreement between
theory and data can be reached for both charged and neutral kaons, in both
spacelike and timelike large-$Q^2$ domains.
| [
{
"created": "Tue, 30 Jul 2024 18:23:17 GMT",
"version": "v1"
}
] | 2024-08-01 | [
[
"Chen",
"Long-Bin",
""
],
[
"Chen",
"Wen",
""
],
[
"Feng",
"Feng",
""
],
[
"Jia",
"Yu",
""
]
] | Among countless channels of hard exclusive reactions, the kaon electromagnetic form factors (EMFFs) are of special interest, which have been measured up to $Q^2 \sim 50\;{\rm GeV}^2$ in the timelike domain. The kaon EMFFs thereby serve an ideal platform to critically examine the validity and effectiveness of perturbative QCD (pQCD) in accounting for hard exclusive processes. In this work we confront the pQCD predictions that incorporate the next-to-next-to-leading-order (NNLO) perturbative corrections, with the available kaon EMFFs data set from experimental measurements and from lattice predictions. The inclusion of the NNLO corrections turns out to have a substantial and positive impact. If the profiles of the kaon light-cone distribution amplitudes (LCDAs) are taken from the recent lattice QCD prediction by {\tt LPC} Collaboration, the satisfactory agreement between theory and data can be reached for both charged and neutral kaons, in both spacelike and timelike large-$Q^2$ domains. |
hep-ph/9801417 | J. Gunion | John F. Gunion (U.C. Davis) | Searching for Low-Energy Supersymmetry | 60 pages, to appear in Quantum Effects in the MSSM, the Proceedings
of the ``International Workshop on Quantum Effects in the MSSM'', UAB,
Barcelona, September 9--13, 1997; full postscript file, including embedded
figures, is available via anonymous ftp at
ftp://ucdhep.ucdavis.edu/gunion/barcelona_hepph.ps | null | null | UCD-98-2 | hep-ph hep-ex | null | A review of supersymmetry theory and phenomenology is presented. Topics
discussed include: gravity-mediated (SUGRA) and gauge-mediated (GMSB)
supersymmetry breaking models; an overview of non-universal
soft-supersymmetry-breaking masses and the resulting experimental implications;
the phenomenology of and constraints on the possibility that a massive gluino
is the lightest supersymmetric particle; current status of the phenomenology of
the Higgs bosons of the minimal and next-to-minimal supersymmetric models; and,
the signals for GMSB and/or R-parity-violating models coming from delayed
decays of the lightest supersymmetric partner of the Standard Model particles.
| [
{
"created": "Tue, 27 Jan 1998 17:29:06 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Gunion",
"John F.",
"",
"U.C. Davis"
]
] | A review of supersymmetry theory and phenomenology is presented. Topics discussed include: gravity-mediated (SUGRA) and gauge-mediated (GMSB) supersymmetry breaking models; an overview of non-universal soft-supersymmetry-breaking masses and the resulting experimental implications; the phenomenology of and constraints on the possibility that a massive gluino is the lightest supersymmetric particle; current status of the phenomenology of the Higgs bosons of the minimal and next-to-minimal supersymmetric models; and, the signals for GMSB and/or R-parity-violating models coming from delayed decays of the lightest supersymmetric partner of the Standard Model particles. |
2109.12385 | Anatoly Serebrov | A. Serebrov, R. Samoilov, M. Chaikovskii | Experimental indications of the 3+1 neutrino model with one sterile
neutrino | 7 pages, 5 figures | null | null | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | The possibility of the validation of the 3+1 neutrino model is considered in
the context of the new result of the Neutrino-4 experiment, the direct
observation of the oscillation effect at parameter region $\Delta m_{14}^2=(7.3
\pm 0.13_{stat} \pm 1.16_{syst})\text{eV}^2$ and $\sin^2(2\theta_{14}) = 0.36
\pm 0.12_{stat} (2.9\sigma)$, also using LSND anomaly, MiniBooNE anomaly,
reactor antineutrino anomaly, and gallium anomaly observed in experiments with
radioactive sources GALLEX/GNO and SAGE. We analyze agreement of the neutrino
parameter values obtained in the Neutrino-4 experiment with the results of
other reactor type experiments NEOS, DANSS, STEREO, PROSPECT, the experiments
at accelerators MiniBooNE, LSND, and the IceCube experiment. We present the
analysis of the 3+1 neutrino model which demonstrates the agreement among the
experiments within current experimental accuracy. Also, current accuracy allows
us to make estimations of the effective masses of the neutrinos. The mass of
the sterile neutrino obtained in the Neutrino-4 experiment (in assumption
$m_2^2 \approx \Delta m_{14}^2$) is $m_4 = (2.70\pm0.22)\text{eV}$. Using the
estimations of the mixing angles we calculated the values of the electron, muon
and tau neutrinos: $m_{4\nu_e}^{\text{eff}}=(0.82\pm0.18)\text{eV},
m_{4\nu_{\mu}}^{\text{eff}}=(0.41\pm0.26)\text{eV},
m_{4\nu_{\tau}}^{\text{eff}}\leq 0.60\text{eV}$. These results are compared
with the values obtained in the experiments in the direct measurement of the
neutrino mass KATRIN and GERDA. The Pontecorvo-Maki-Nakagawa-Sakata matrix with
four states and the mixing scheme of the flavor neutrinos with the sterile
state are presented.
| [
{
"created": "Sat, 25 Sep 2021 15:24:55 GMT",
"version": "v1"
},
{
"created": "Fri, 1 Oct 2021 12:13:23 GMT",
"version": "v2"
},
{
"created": "Thu, 21 Oct 2021 11:38:32 GMT",
"version": "v3"
}
] | 2021-10-22 | [
[
"Serebrov",
"A.",
""
],
[
"Samoilov",
"R.",
""
],
[
"Chaikovskii",
"M.",
""
]
] | The possibility of the validation of the 3+1 neutrino model is considered in the context of the new result of the Neutrino-4 experiment, the direct observation of the oscillation effect at parameter region $\Delta m_{14}^2=(7.3 \pm 0.13_{stat} \pm 1.16_{syst})\text{eV}^2$ and $\sin^2(2\theta_{14}) = 0.36 \pm 0.12_{stat} (2.9\sigma)$, also using LSND anomaly, MiniBooNE anomaly, reactor antineutrino anomaly, and gallium anomaly observed in experiments with radioactive sources GALLEX/GNO and SAGE. We analyze agreement of the neutrino parameter values obtained in the Neutrino-4 experiment with the results of other reactor type experiments NEOS, DANSS, STEREO, PROSPECT, the experiments at accelerators MiniBooNE, LSND, and the IceCube experiment. We present the analysis of the 3+1 neutrino model which demonstrates the agreement among the experiments within current experimental accuracy. Also, current accuracy allows us to make estimations of the effective masses of the neutrinos. The mass of the sterile neutrino obtained in the Neutrino-4 experiment (in assumption $m_2^2 \approx \Delta m_{14}^2$) is $m_4 = (2.70\pm0.22)\text{eV}$. Using the estimations of the mixing angles we calculated the values of the electron, muon and tau neutrinos: $m_{4\nu_e}^{\text{eff}}=(0.82\pm0.18)\text{eV}, m_{4\nu_{\mu}}^{\text{eff}}=(0.41\pm0.26)\text{eV}, m_{4\nu_{\tau}}^{\text{eff}}\leq 0.60\text{eV}$. These results are compared with the values obtained in the experiments in the direct measurement of the neutrino mass KATRIN and GERDA. The Pontecorvo-Maki-Nakagawa-Sakata matrix with four states and the mixing scheme of the flavor neutrinos with the sterile state are presented. |
2007.04990 | Marco Gorghetto | Marco Gorghetto, Edward Hardy, Giovanni Villadoro | More Axions from Strings | 19 pages + appendices | SciPost Phys. 10, 050 (2021) | 10.21468/SciPostPhys.10.2.050 | null | hep-ph astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the contribution to the QCD axion dark matter abundance that is
produced by string defects during the so-called scaling regime. Clear evidence
of scaling violations is found, the most conservative extrapolation of which
strongly suggests a large number of axions from strings. In this regime,
nonlinearities at around the QCD scale are shown to play an important role in
determining the final abundance. The overall result is a lower bound on the QCD
axion mass in the post-inflationary scenario that is substantially stronger
than the naive one from misalignment.
| [
{
"created": "Thu, 9 Jul 2020 18:00:00 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Mar 2021 14:29:48 GMT",
"version": "v2"
}
] | 2021-03-23 | [
[
"Gorghetto",
"Marco",
""
],
[
"Hardy",
"Edward",
""
],
[
"Villadoro",
"Giovanni",
""
]
] | We study the contribution to the QCD axion dark matter abundance that is produced by string defects during the so-called scaling regime. Clear evidence of scaling violations is found, the most conservative extrapolation of which strongly suggests a large number of axions from strings. In this regime, nonlinearities at around the QCD scale are shown to play an important role in determining the final abundance. The overall result is a lower bound on the QCD axion mass in the post-inflationary scenario that is substantially stronger than the naive one from misalignment. |
hep-ph/0610428 | Shinta Kasuya | Shinta Kasuya | Towards the robustness of Affleck-Dine mechanism | 6 pages, to appear in the proceedings of IRGAC 2006, 2nd
International Conference on Quantum Theories and Renormalization Group in
Gravity and Cosmology, Barcelona, July 11-15 2006 | J.Phys.A40:6999-7004,2007 | 10.1088/1751-8113/40/25/S52 | null | hep-ph | null | In this talk we considered the Affleck-Dine mechanism with various types of
the Kahler potential, and investigate whether or not the Affleck-Dine field
could acquire a large VEV as an initial condition for successful baryogenesis.
In addition to a negative Hubble-induced mass term, we found examples that
large enough Hubble-induced A-terms could also develop the minima at large
amplitude of the field. It is concluded, therefore, that the Affleck-Dine
mechanism works for broader classes of the theories. This talk is based on
Ref.[1]. Here I extend the discussion from more generic standpoint, and find
that essentially there are three cases that large enough A terms develop minima
at large field values.
| [
{
"created": "Tue, 31 Oct 2006 13:55:07 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Kasuya",
"Shinta",
""
]
] | In this talk we considered the Affleck-Dine mechanism with various types of the Kahler potential, and investigate whether or not the Affleck-Dine field could acquire a large VEV as an initial condition for successful baryogenesis. In addition to a negative Hubble-induced mass term, we found examples that large enough Hubble-induced A-terms could also develop the minima at large amplitude of the field. It is concluded, therefore, that the Affleck-Dine mechanism works for broader classes of the theories. This talk is based on Ref.[1]. Here I extend the discussion from more generic standpoint, and find that essentially there are three cases that large enough A terms develop minima at large field values. |
0902.3764 | Gouranga Nayak | Gouranga C Nayak (U. Arizona) | String Theory at LHC Using Top Quarks From String Balls | 20 pages latex, 6 figures, final version | JHEP 0906:071,2009 | 10.1088/1126-6708/2009/06/071 | null | hep-ph gr-qc hep-ex hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | According to string theory, string ball is a highly excited long string which
decays to standard model particles at the Hagedorn temperature with thermal
spectrum. If there are extra dimensions, the string scale can be $\sim$ TeV,
and we should produce string balls at CERN LHC. In this paper we study top
quark production from string balls at LHC and compare with the parton fusion
results at NNLO using pQCD. We find significant top quark production from
string balls at LHC which is comparable to standard model pQCD results. We also
find that $\frac{d\sigma}{dp_T}$ of top quarks from string balls does not
decrease significantly with increase in $p_T$, whereas it deceases sharply in
case of standard model pQCD scenario. Hence, in the absence of black hole
production at LHC, an enhancement in top quark cross section and its abnormal
$p_T$ distribution can be a signature of TeV scale string physics at LHC.
String theory is also studied at LHC via string Regge excitations in the weak
coupling limit in model independent framework. Since massive quark production
amplitude is not available in string Regge excitations scenario, we compute
massless quark production in string Regge excitations scenario and make a clear
comparison with that produced from string balls at LHC for a given luminosity.
| [
{
"created": "Mon, 23 Feb 2009 19:04:39 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Jun 2009 14:15:44 GMT",
"version": "v2"
}
] | 2009-07-22 | [
[
"Nayak",
"Gouranga C",
"",
"U. Arizona"
]
] | According to string theory, string ball is a highly excited long string which decays to standard model particles at the Hagedorn temperature with thermal spectrum. If there are extra dimensions, the string scale can be $\sim$ TeV, and we should produce string balls at CERN LHC. In this paper we study top quark production from string balls at LHC and compare with the parton fusion results at NNLO using pQCD. We find significant top quark production from string balls at LHC which is comparable to standard model pQCD results. We also find that $\frac{d\sigma}{dp_T}$ of top quarks from string balls does not decrease significantly with increase in $p_T$, whereas it deceases sharply in case of standard model pQCD scenario. Hence, in the absence of black hole production at LHC, an enhancement in top quark cross section and its abnormal $p_T$ distribution can be a signature of TeV scale string physics at LHC. String theory is also studied at LHC via string Regge excitations in the weak coupling limit in model independent framework. Since massive quark production amplitude is not available in string Regge excitations scenario, we compute massless quark production in string Regge excitations scenario and make a clear comparison with that produced from string balls at LHC for a given luminosity. |
1403.4634 | Mathias Garny | Mathias Garny, Alejandro Ibarra, Sara Rydbeck, Stefan Vogl | Majorana Dark Matter with a Coloured Mediator: Collider vs Direct and
Indirect Searches | 32 pages, 9 figures | null | 10.1007/JHEP06(2014)169 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the signatures at the Large Hadron Collider of a minimal model
where the dark matter particle is a Majorana fermion that couples to the
Standard Model via one or several coloured mediators. We emphasize the
importance of the production channel of coloured scalars through the exchange
of a dark matter particle in the t-channel, and perform a dedicated analysis of
searches for jets and missing energy for this model. We find that the collider
constraints are highly competitive compared to direct detection, and can even
be considerably stronger over a wide range of parameters. We also discuss the
complementarity with searches for spectral features at gamma-ray telescopes and
comment on the possibility of several coloured mediators, which is further
constrained by flavour observables.
| [
{
"created": "Tue, 18 Mar 2014 22:24:23 GMT",
"version": "v1"
}
] | 2015-06-19 | [
[
"Garny",
"Mathias",
""
],
[
"Ibarra",
"Alejandro",
""
],
[
"Rydbeck",
"Sara",
""
],
[
"Vogl",
"Stefan",
""
]
] | We investigate the signatures at the Large Hadron Collider of a minimal model where the dark matter particle is a Majorana fermion that couples to the Standard Model via one or several coloured mediators. We emphasize the importance of the production channel of coloured scalars through the exchange of a dark matter particle in the t-channel, and perform a dedicated analysis of searches for jets and missing energy for this model. We find that the collider constraints are highly competitive compared to direct detection, and can even be considerably stronger over a wide range of parameters. We also discuss the complementarity with searches for spectral features at gamma-ray telescopes and comment on the possibility of several coloured mediators, which is further constrained by flavour observables. |
1611.07755 | Zhun Lu | Yongliang Yang and Zhun Lu | Polarized Lambda hyperon production in Semi-inclusive deep inelastic
scattering off an unpolarized nulceon target | 11 pages, 2 figures, match the version published in PRD | Phys. Rev. D 95, 074026 (2017) | 10.1103/PhysRevD.95.074026 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the production of polarized $\Lambda$ hyperon in semi-inclusive deep
inelastic scattering off an unpolarized target. We include the cases in which
the $\Lambda$ hyperon is longitudinally polarized or transversely polarized,
and in which the lepton beam is unpolarized or longitudinally polarized. Within
the framework of the transverse momentum dependent factorization, we take into
account the complete decomposition of the parton correlator for fragmentation
up to twist-3. We present the cross section of the process to order $1/Q$. The
expressions of the polarized structure functions, which may give rise to
various spin asymmetries, are also given.
| [
{
"created": "Wed, 23 Nov 2016 12:02:46 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Apr 2017 00:06:05 GMT",
"version": "v2"
}
] | 2017-04-26 | [
[
"Yang",
"Yongliang",
""
],
[
"Lu",
"Zhun",
""
]
] | We study the production of polarized $\Lambda$ hyperon in semi-inclusive deep inelastic scattering off an unpolarized target. We include the cases in which the $\Lambda$ hyperon is longitudinally polarized or transversely polarized, and in which the lepton beam is unpolarized or longitudinally polarized. Within the framework of the transverse momentum dependent factorization, we take into account the complete decomposition of the parton correlator for fragmentation up to twist-3. We present the cross section of the process to order $1/Q$. The expressions of the polarized structure functions, which may give rise to various spin asymmetries, are also given. |
1606.05552 | Naoya Kitajima | Tetsutaro Higaki, Kwang Sik Jeong, Naoya Kitajima, Toyokazu Sekiguchi,
Fuminobu Takahashi | Topological Defects and nano-Hz Gravitational Waves in Aligned Axion
Models | 23 pages, 7 figures | null | 10.1007/JHEP08(2016)044 | PNUTP-16/A12, TU-1025, IPMU16-0083, APCTP Pre2016-015, CTPU-16-16 | hep-ph astro-ph.CO hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the formation and evolution of topological defects in an aligned
axion model with multiple Peccei-Quinn scalars, where the QCD axion is realized
by a certain combination of the axions with decay constants much smaller than
the conventional Peccei-Quinn breaking scale. When the underlying U(1)
symmetries are spontaneously broken, the aligned structure in the axion field
space exhibits itself as a complicated string-wall network in the real space.
We find that the string-wall network likely survives until the QCD phase
transition if the number of the Peccei-Quinn scalars is greater than two. The
string-wall system collapses during the QCD phase transition, producing a
significant amount of gravitational waves in the nano-Hz range at present. The
typical decay constant is constrained to be below O(100) TeV by the pulsar
timing observations, and the constraint will be improved by a factor of 2 in
the future SKA observations.
| [
{
"created": "Fri, 17 Jun 2016 15:10:10 GMT",
"version": "v1"
}
] | 2016-08-24 | [
[
"Higaki",
"Tetsutaro",
""
],
[
"Jeong",
"Kwang Sik",
""
],
[
"Kitajima",
"Naoya",
""
],
[
"Sekiguchi",
"Toyokazu",
""
],
[
"Takahashi",
"Fuminobu",
""
]
] | We study the formation and evolution of topological defects in an aligned axion model with multiple Peccei-Quinn scalars, where the QCD axion is realized by a certain combination of the axions with decay constants much smaller than the conventional Peccei-Quinn breaking scale. When the underlying U(1) symmetries are spontaneously broken, the aligned structure in the axion field space exhibits itself as a complicated string-wall network in the real space. We find that the string-wall network likely survives until the QCD phase transition if the number of the Peccei-Quinn scalars is greater than two. The string-wall system collapses during the QCD phase transition, producing a significant amount of gravitational waves in the nano-Hz range at present. The typical decay constant is constrained to be below O(100) TeV by the pulsar timing observations, and the constraint will be improved by a factor of 2 in the future SKA observations. |
1308.5802 | Ivan Girardi | Ivan Girardi, Aurora Meroni and S. T. Petcov | Neutrinoless Double Beta Decay in the Presence of Light Sterile
Neutrinos | 36 pages, 22 figures, 5 tables, results unchanged, discussion of
cosmological constraints on sterile neutrinos added, the presentation of
figures 7, 13, 17 and 21 changed; version to be published in JHEP | JHEP 1311 (2013) 146 | 10.1007/JHEP11(2013)146 | SISSA 37/2013/FISI | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the predictions for neutrinoless double beta ($(\beta
\beta)_{0 \nu}$-) decay effective Majorana mass $\left| \langle \, m \, \rangle
\right|$ in the 3+1 and 3+2 schemes with one and two additional sterile
neutrinos with masses at the eV scale. The two schemes are suggested by the
neutrino oscillation interpretation of the reactor neutrino and Gallium
"anomalies" and of the data of the LSND and MiniBooNE experiments. We analyse
in detail the possibility of a complete or partial cancellation between the
different terms in $\left| \langle \, m \, \rangle \right|$, leading to a
strong suppression of $\left| \langle \, m \, \rangle \right|$. We determine
the regions of the relevant parameter spaces where such a suppression can
occure. This allows us to derive the conditions under which the effective
Majorana mass satisfies $\left| \langle \, m \, \rangle \right| > 0.01$ eV,
which is the range planned to be exploited by the next generation of $(\beta
\beta)_{0 \nu}$-experiments.
| [
{
"created": "Tue, 27 Aug 2013 09:12:54 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Oct 2013 20:44:13 GMT",
"version": "v2"
}
] | 2014-06-10 | [
[
"Girardi",
"Ivan",
""
],
[
"Meroni",
"Aurora",
""
],
[
"Petcov",
"S. T.",
""
]
] | We investigate the predictions for neutrinoless double beta ($(\beta \beta)_{0 \nu}$-) decay effective Majorana mass $\left| \langle \, m \, \rangle \right|$ in the 3+1 and 3+2 schemes with one and two additional sterile neutrinos with masses at the eV scale. The two schemes are suggested by the neutrino oscillation interpretation of the reactor neutrino and Gallium "anomalies" and of the data of the LSND and MiniBooNE experiments. We analyse in detail the possibility of a complete or partial cancellation between the different terms in $\left| \langle \, m \, \rangle \right|$, leading to a strong suppression of $\left| \langle \, m \, \rangle \right|$. We determine the regions of the relevant parameter spaces where such a suppression can occure. This allows us to derive the conditions under which the effective Majorana mass satisfies $\left| \langle \, m \, \rangle \right| > 0.01$ eV, which is the range planned to be exploited by the next generation of $(\beta \beta)_{0 \nu}$-experiments. |
1301.4455 | Zhi-Guo He | Zhi-Guo He, and Jian-Xiong Wang | The QED contribution to $J/\psi$ plus light hadrons production at
B-factories | 19 pages, 6 figures | Phys. Rev. D 100, 114025 (2019) | 10.1103/PhysRevD.100.114025 | DESY 13-009 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | To understand the direct $J/\psi+X_{\mathrm{non-c\bar{c}}}$ production
mechanism in $e^{+}e^{-}$ annihilation, in this work, we propose to measure the
inclusive $J/\psi$ plus light hadrons (LH) production at B-factories and
present a detailed study on its QED production due to $\psi(2S)$ feed-down,
where the $\psi(2S)$ are produced in $e^{+}e^{-}\to \psi(2S)+\gamma$ and
$e^{+}e^{-}\to \psi(2S)+f\bar{f}, f=lepton,light quark$, and QED contribution
to direct $J/\psi+q\bar{q}$ production with $q=u,d,s$ quark. We find that the
QED contribution is huge in the whole phase space region, but can be reduced
largely and is in the same order as the QCD contribution when a suitable cut on
the angel $\theta_{J/\psi}$ between $J/\psi$ and the $e^{+}e^{-}$ beam is made.
In this way, the cross section of $J/\psi+LH$ QCD production %which was
predicted theoretical at next-to-leading order QCD together with relativistic
correction, can be obtained by subtracting the QED contribution from the
experimental measurement on inclusive $J/\psi$ plus light hadrons. To help to
remove the QED background, we also calculate the angular and momentum
distribution of $J/\psi$ in the QED contribution.
| [
{
"created": "Fri, 18 Jan 2013 18:33:37 GMT",
"version": "v1"
}
] | 2019-12-25 | [
[
"He",
"Zhi-Guo",
""
],
[
"Wang",
"Jian-Xiong",
""
]
] | To understand the direct $J/\psi+X_{\mathrm{non-c\bar{c}}}$ production mechanism in $e^{+}e^{-}$ annihilation, in this work, we propose to measure the inclusive $J/\psi$ plus light hadrons (LH) production at B-factories and present a detailed study on its QED production due to $\psi(2S)$ feed-down, where the $\psi(2S)$ are produced in $e^{+}e^{-}\to \psi(2S)+\gamma$ and $e^{+}e^{-}\to \psi(2S)+f\bar{f}, f=lepton,light quark$, and QED contribution to direct $J/\psi+q\bar{q}$ production with $q=u,d,s$ quark. We find that the QED contribution is huge in the whole phase space region, but can be reduced largely and is in the same order as the QCD contribution when a suitable cut on the angel $\theta_{J/\psi}$ between $J/\psi$ and the $e^{+}e^{-}$ beam is made. In this way, the cross section of $J/\psi+LH$ QCD production %which was predicted theoretical at next-to-leading order QCD together with relativistic correction, can be obtained by subtracting the QED contribution from the experimental measurement on inclusive $J/\psi$ plus light hadrons. To help to remove the QED background, we also calculate the angular and momentum distribution of $J/\psi$ in the QED contribution. |
0710.2891 | Stuart Raby | Stuart Raby | SUSY Model Building | Submitted for the SUSY07 proceedings, some references added | null | null | OHSTPY-HEP-T-07-004 | hep-ph | null | I review some of the latest directions in supersymmetric model building,
focusing on SUSY breaking mechanisms in the minimal supersymmetric standard
model [MSSM], the "little" hierarchy and $\mu$ problems, etc. I then discuss
SUSY GUTs and UV completions in string theory.
| [
{
"created": "Mon, 15 Oct 2007 18:38:44 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Oct 2007 14:06:38 GMT",
"version": "v2"
},
{
"created": "Fri, 19 Oct 2007 18:27:32 GMT",
"version": "v3"
}
] | 2011-11-10 | [
[
"Raby",
"Stuart",
""
]
] | I review some of the latest directions in supersymmetric model building, focusing on SUSY breaking mechanisms in the minimal supersymmetric standard model [MSSM], the "little" hierarchy and $\mu$ problems, etc. I then discuss SUSY GUTs and UV completions in string theory. |
hep-ph/9708226 | Masahiro Kawasaki | J. Hashiba, M. Kawasaki and T. Yanagida | Cosmological Constraint on the String Dilaton in Gauge-mediated
Supersymmetry Breaking Theories | 13 pages (RevTex file including one figure, use psfig), revised
version to be published in Physical Review Letters | Phys.Rev.Lett. 79 (1997) 4525-4528 | 10.1103/PhysRevLett.79.4525 | null | hep-ph astro-ph | null | The dilaton field in string theories (if exists) is expected to have a mass
of the order of the gravitino mass $m_{3/2}$ which is in a range of
$10^{-2}$keV--1GeV in gauge-mediated supersymmetry breaking models. If it is
the case, the cosmic energy density of coherent dilaton oscillation easily
exceeds the critical density of the present universe. We show that even if this
problem is solved by a late-time entropy production (thermal inflation) a
stringent constraint on the energy density of the dilaton oscillation is
derived from experimental upperbounds on the cosmic X($\gamma$)-ray
backgrounds. This excludes an interesting mass region, $500keV \lesssim m_{3/2}
\lesssim 1GeV$, in gauge-mediated supersymmetry breaking models.
| [
{
"created": "Mon, 4 Aug 1997 04:58:39 GMT",
"version": "v1"
},
{
"created": "Fri, 3 Oct 1997 10:44:02 GMT",
"version": "v2"
}
] | 2009-10-30 | [
[
"Hashiba",
"J.",
""
],
[
"Kawasaki",
"M.",
""
],
[
"Yanagida",
"T.",
""
]
] | The dilaton field in string theories (if exists) is expected to have a mass of the order of the gravitino mass $m_{3/2}$ which is in a range of $10^{-2}$keV--1GeV in gauge-mediated supersymmetry breaking models. If it is the case, the cosmic energy density of coherent dilaton oscillation easily exceeds the critical density of the present universe. We show that even if this problem is solved by a late-time entropy production (thermal inflation) a stringent constraint on the energy density of the dilaton oscillation is derived from experimental upperbounds on the cosmic X($\gamma$)-ray backgrounds. This excludes an interesting mass region, $500keV \lesssim m_{3/2} \lesssim 1GeV$, in gauge-mediated supersymmetry breaking models. |
1612.04249 | Chun-Khiang Chua | Chun-Khiang Chua | Rates and $CP$ asymmetries of Charmless Two-body Baryonic $B_{u,d,s}$
Decays | To appear in Phys. Rev. D, 58 pages, 3 figures, 17 tables, some
useful formulas from arXiv:1312.2335 are collected (with minor correction) in
appendices | Phys. Rev. D 95, 096004 (2017) | 10.1103/PhysRevD.95.096004 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | With the experimental evidences of $\overline B {}^0\to p \overline{p}$ and
$B^-\to\Lambda\overline p$ decays, it is now possible to extract both tree and
penguin amplitudes of the charmless two-body baryonic $B$ decays for the first
time. The extracted penguin-tree ratio agrees with the expectation. Using the
topological amplitude approach with the experimental results on $\overline B
{}^0\to p \overline{p}$ and $B^-\to\Lambda\bar p$ decay rates as input,
predictions on all other $\overline B_q\to {\cal B} \overline {\cal B}$, ${\cal
B} \overline {\cal D}$, ${\cal D} \overline {\cal B}$ and ${\cal D} \overline
{\cal D}$ decay rates, where ${\mathcal B}$ and ${\cal D}$ are the low lying
octet and decuplet baryons, respectively, are given. It is non-trivial that the
results do not violate any existing experimental upper limit. From the analysis
it is understandable that why $\overline B {}^0\to p \overline{p}$ and
$B^-\to\Lambda\bar p$ modes are the first two modes with experimental
evidences. Relations on rates are verified using the numerical results. We note
that the predicted $B^-\to p\overline{\Delta^{++}}$ rate is close to the
experimental bound, which has not been updated in the last ten years. Direct
$CP$ asymmetries of all $\overline B_q\to {\cal B} \overline {\cal B}$, ${\cal
B} \overline {\cal D}$, ${\cal D} \overline {\cal B}$ and ${\cal D} \overline
{\cal D}$ modes are explored. Relations on $CP$ asymmetries are examined using
the numerical results. The direct $CP$ asymmetry of $\overline B {}^0\to p
\overline{p}$ decay can be as large as $\pm 50\%$. The $CP$ asymmetries of
$\Delta S=-1$ pure penguin modes are constrained to be of few $\%$. These modes
are expected to be sensitive to New Physics contributions and are good
candidates to be added to the list of the tests of the Standard Model.
| [
{
"created": "Tue, 13 Dec 2016 16:00:07 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Dec 2016 15:47:05 GMT",
"version": "v2"
},
{
"created": "Mon, 6 Mar 2017 16:11:44 GMT",
"version": "v3"
},
{
"created": "Wed, 19 Apr 2017 07:15:05 GMT",
"version": "v4"
}
] | 2017-05-17 | [
[
"Chua",
"Chun-Khiang",
""
]
] | With the experimental evidences of $\overline B {}^0\to p \overline{p}$ and $B^-\to\Lambda\overline p$ decays, it is now possible to extract both tree and penguin amplitudes of the charmless two-body baryonic $B$ decays for the first time. The extracted penguin-tree ratio agrees with the expectation. Using the topological amplitude approach with the experimental results on $\overline B {}^0\to p \overline{p}$ and $B^-\to\Lambda\bar p$ decay rates as input, predictions on all other $\overline B_q\to {\cal B} \overline {\cal B}$, ${\cal B} \overline {\cal D}$, ${\cal D} \overline {\cal B}$ and ${\cal D} \overline {\cal D}$ decay rates, where ${\mathcal B}$ and ${\cal D}$ are the low lying octet and decuplet baryons, respectively, are given. It is non-trivial that the results do not violate any existing experimental upper limit. From the analysis it is understandable that why $\overline B {}^0\to p \overline{p}$ and $B^-\to\Lambda\bar p$ modes are the first two modes with experimental evidences. Relations on rates are verified using the numerical results. We note that the predicted $B^-\to p\overline{\Delta^{++}}$ rate is close to the experimental bound, which has not been updated in the last ten years. Direct $CP$ asymmetries of all $\overline B_q\to {\cal B} \overline {\cal B}$, ${\cal B} \overline {\cal D}$, ${\cal D} \overline {\cal B}$ and ${\cal D} \overline {\cal D}$ modes are explored. Relations on $CP$ asymmetries are examined using the numerical results. The direct $CP$ asymmetry of $\overline B {}^0\to p \overline{p}$ decay can be as large as $\pm 50\%$. The $CP$ asymmetries of $\Delta S=-1$ pure penguin modes are constrained to be of few $\%$. These modes are expected to be sensitive to New Physics contributions and are good candidates to be added to the list of the tests of the Standard Model. |
hep-ph/0109118 | Steve King | G. L. Kane and S. F. King | Intermediate Scale Supersymmetric Inflation, Matter and Dark Energy | Version to appear in New Journal of Physics. 19 pages, Latex | NewJ.Phys.3:21,2001 | 10.1088/1367-2630/3/1/321 | MCTP-01-42, SHEP 01-25 | hep-ph | null | We consider supersymmetric inflation models in which inflation occurs at an
intermediate scale and which provide a solution to the $\mu$ problem and the
strong CP problem. Such models are particularly attractive since inflation,
baryogenesis and the relic abundance of cold dark matter are all related by a
set of parameters which also affect particle physics collider phenomena,
neutrino masses and the strong CP problem. For such models the natural
situation is a universe containing matter composed of baryons, massive
neutrinos, lightest superpartner cold dark matter, and axions. The present day
relic abundances of these different forms of matter are (in principle)
calculable from the supersymmetric inflation model together with a measurement
of the CMB temperature and the Hubble constant. From these relic abundances one
can deduce the amount of the present day dark energy density.
| [
{
"created": "Thu, 13 Sep 2001 17:51:50 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Sep 2001 08:31:00 GMT",
"version": "v2"
},
{
"created": "Tue, 30 Oct 2001 13:57:48 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Kane",
"G. L.",
""
],
[
"King",
"S. F.",
""
]
] | We consider supersymmetric inflation models in which inflation occurs at an intermediate scale and which provide a solution to the $\mu$ problem and the strong CP problem. Such models are particularly attractive since inflation, baryogenesis and the relic abundance of cold dark matter are all related by a set of parameters which also affect particle physics collider phenomena, neutrino masses and the strong CP problem. For such models the natural situation is a universe containing matter composed of baryons, massive neutrinos, lightest superpartner cold dark matter, and axions. The present day relic abundances of these different forms of matter are (in principle) calculable from the supersymmetric inflation model together with a measurement of the CMB temperature and the Hubble constant. From these relic abundances one can deduce the amount of the present day dark energy density. |
2109.09058 | A. Bashir | L.X. Guti\'errez-Guerrero, G. Paredes-Torres, A. Bashir | Mesons and Baryons: Parity Partners | 10 pages, 4 figures | null | 10.1103/PhysRevD.104.094013 | null | hep-ph nucl-th | http://creativecommons.org/licenses/by/4.0/ | We calculate masses of light and heavy mesons as well as baryons of negative
parity containing $u,d,s,c$ and $b$ quarks. It is an extension of our previous
work where we had studied the positive parity baryons. We adopt a quark-diquark
picture of baryons where the diquarks are non-pointlike with a finite spatial
extension. The mathematical foundation for this analysis is implemented through
a symmetry-preserving Schwinger-Dyson equations treatment of a vector-vector
contact interaction, which preserves key features of quantum chromodynamics,
such as confinement, chiral symmetry breaking, axial vector Ward-Takahashi
identity and low-energy Goldberger-Treiman relations. This treatment
simultaneously describes mesons and provides attractive correlations for
diquarks in the $\overline{3}$ representation. Employing this model, we compute
the spectrum and masses of all spin-1/2 and spin-3/2 baryons of negative
parity, supplementing our earlier evaluation of positive parity baryons,
containing 1, 2 or 3 heavy quarks. In the process, we calculate masses of a
multitude of mesons and corresponding diquarks. Wherever possible, we make
comparisons of our results with known experimental observations as well as
theoretical predictions of several models and approaches including lattice
quantum chromodynamics, finding satisfactory agreement. We also make
predictions for heavier states not yet observed in the experiment.
| [
{
"created": "Sun, 19 Sep 2021 04:47:20 GMT",
"version": "v1"
}
] | 2021-11-24 | [
[
"Gutiérrez-Guerrero",
"L. X.",
""
],
[
"Paredes-Torres",
"G.",
""
],
[
"Bashir",
"A.",
""
]
] | We calculate masses of light and heavy mesons as well as baryons of negative parity containing $u,d,s,c$ and $b$ quarks. It is an extension of our previous work where we had studied the positive parity baryons. We adopt a quark-diquark picture of baryons where the diquarks are non-pointlike with a finite spatial extension. The mathematical foundation for this analysis is implemented through a symmetry-preserving Schwinger-Dyson equations treatment of a vector-vector contact interaction, which preserves key features of quantum chromodynamics, such as confinement, chiral symmetry breaking, axial vector Ward-Takahashi identity and low-energy Goldberger-Treiman relations. This treatment simultaneously describes mesons and provides attractive correlations for diquarks in the $\overline{3}$ representation. Employing this model, we compute the spectrum and masses of all spin-1/2 and spin-3/2 baryons of negative parity, supplementing our earlier evaluation of positive parity baryons, containing 1, 2 or 3 heavy quarks. In the process, we calculate masses of a multitude of mesons and corresponding diquarks. Wherever possible, we make comparisons of our results with known experimental observations as well as theoretical predictions of several models and approaches including lattice quantum chromodynamics, finding satisfactory agreement. We also make predictions for heavier states not yet observed in the experiment. |
hep-ph/9410317 | null | N.N.Nikolaev, B.G.Zakharov and V.R.Zoller | The direct calculation of the slope of the QCD pomeron's trajectory | null | JETP Lett. 60 (1994) 694-698 | null | ITEP-74-94, October 1994 | hep-ph | null | We demonstrate that the diffraction slope of the generalized BFKL pomeron
amplitude has the conventional Regge growth $B(s) = B(0) +
2\alpha_{\Pom}'\log(s)$. This proves that the generalized BFKL pomeron is
described by the moving $j$-plane singularity. We give an estimate for the
slope $\alpha_{\Pom}'$ in terms of the correlation radius for the perturbative
gluons.
| [
{
"created": "Wed, 19 Oct 1994 13:50:35 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Oct 1994 10:02:36 GMT",
"version": "v2"
},
{
"created": "Tue, 25 Oct 1994 08:49:13 GMT",
"version": "v3"
}
] | 2009-09-25 | [
[
"Nikolaev",
"N. N.",
""
],
[
"Zakharov",
"B. G.",
""
],
[
"Zoller",
"V. R.",
""
]
] | We demonstrate that the diffraction slope of the generalized BFKL pomeron amplitude has the conventional Regge growth $B(s) = B(0) + 2\alpha_{\Pom}'\log(s)$. This proves that the generalized BFKL pomeron is described by the moving $j$-plane singularity. We give an estimate for the slope $\alpha_{\Pom}'$ in terms of the correlation radius for the perturbative gluons. |
hep-ph/0001035 | Stefan Soldner-Rembold | A Donnachie, S Soldner-Rembold | Gamma(*)Gamma(*) reaction at high energies | 6 pages, 6 figures, submitted to proceedings of the Durham Collider
Workshop, 22-26 September 1999 | J.Phys.G26:689-695,2000 | 10.1088/0954-3899/26/5/328 | FREIBURG EHEP-2000-01 | hep-ph hep-ex | null | The energy available for gamma(*)gamma(*) physics at LEP2 is opening a new
window on the study of diffractive phenomena, both non-perturbative and
perturbative. We discuss some of the uncertainties and problems connected with
the experimental measurements and their interpretation.
| [
{
"created": "Wed, 5 Jan 2000 13:34:05 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Jan 2000 08:52:47 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Donnachie",
"A",
""
],
[
"Soldner-Rembold",
"S",
""
]
] | The energy available for gamma(*)gamma(*) physics at LEP2 is opening a new window on the study of diffractive phenomena, both non-perturbative and perturbative. We discuss some of the uncertainties and problems connected with the experimental measurements and their interpretation. |
1704.05478 | Daniele Barducci | D. Barducci, M. Fabbrichesi and A. Tonero | Constraints on top quark non-standard interactions from Higgs and $t
\bar t$ production cross sections | 12 pages, 9 figures, 3 tables. Discussion with the relation of the
considered operators with the ones of the Warsaw basis extended. Missing
contribution to the gluon fusion amplitude added. Main results unchanged | Phys. Rev. D 96, 075022 (2017) | 10.1103/PhysRevD.96.075022 | SISSA-21-2017-FISI | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We identify the differential cross sections for $t\bar t$ production and the
total cross section for Higgs production through gluon fusion as the processes
in which the two effective operators describing the leading non-standard
interactions of the top quark with the gluon can be disentangled and studied in
an independent fashion. Current data on the Higgs production and the $ {\rm
d}\sigma/{\rm d} {p^t_T}$ differential cross section provide limits comparable,
but not more stringent, than those from the total $t\bar t$ cross sections
measurements at the LHC and Tevatron, where however the two operators enter on
the same footing and can only be constrained together. Given the present
uncertainties, we find that the most stringent bounds are provided by a
combination of data on the $t \bar t$ total cross sections together with those
from the Higgs production. We conclude by stating the (modest) reduction in the
uncertainties necessary to provide more stringent limits by means of the Higgs
production and $t\bar t$ differential cross section observables at the LHC with
the future luminosity of 300 and 3000 fb$^{-1}$.
| [
{
"created": "Tue, 18 Apr 2017 18:04:42 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Oct 2017 17:01:39 GMT",
"version": "v2"
}
] | 2017-10-25 | [
[
"Barducci",
"D.",
""
],
[
"Fabbrichesi",
"M.",
""
],
[
"Tonero",
"A.",
""
]
] | We identify the differential cross sections for $t\bar t$ production and the total cross section for Higgs production through gluon fusion as the processes in which the two effective operators describing the leading non-standard interactions of the top quark with the gluon can be disentangled and studied in an independent fashion. Current data on the Higgs production and the $ {\rm d}\sigma/{\rm d} {p^t_T}$ differential cross section provide limits comparable, but not more stringent, than those from the total $t\bar t$ cross sections measurements at the LHC and Tevatron, where however the two operators enter on the same footing and can only be constrained together. Given the present uncertainties, we find that the most stringent bounds are provided by a combination of data on the $t \bar t$ total cross sections together with those from the Higgs production. We conclude by stating the (modest) reduction in the uncertainties necessary to provide more stringent limits by means of the Higgs production and $t\bar t$ differential cross section observables at the LHC with the future luminosity of 300 and 3000 fb$^{-1}$. |
1907.01726 | Brian Maddock | Wolfgang Altmannshofer, Brian Maddock, Stefano Profumo | Doubly Blind Spots in Scalar Dark Matter Models | 21 pages, 8 figures | Phys. Rev. D 100, 055033 (2019) | 10.1103/PhysRevD.100.055033 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a framework where the Standard Model is augmented by a second
SU(2) scalar doublet and by a real scalar singlet that, protected by a Z2
symmetry, provides a particle Dark Matter candidate. We show that this setup
allows for doubly blind spots at both collider searches for anomalies in the
Higgs invisible decay width, and at direct Dark Matter detection. The blind
spots originate from cancellations between interfering diagrams featuring
different neutral scalar exchanges, and from cancellations driven by the
two-Higgs doublet structure in the vertex coupling the singlet state with the
Standard-Model-like Higgs. We demonstrate that the blind spots arise in a wide
and generic array of realizations for the two-Higgs doublet model, including
scenarios with a non-trivial flavor structure. We provide analytical
formul{\ae} that describe the location of the blind spots in the theory
parameter space, and we discuss the resulting phenomenology.
| [
{
"created": "Wed, 3 Jul 2019 03:59:16 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Sep 2019 16:57:45 GMT",
"version": "v2"
}
] | 2019-10-02 | [
[
"Altmannshofer",
"Wolfgang",
""
],
[
"Maddock",
"Brian",
""
],
[
"Profumo",
"Stefano",
""
]
] | We consider a framework where the Standard Model is augmented by a second SU(2) scalar doublet and by a real scalar singlet that, protected by a Z2 symmetry, provides a particle Dark Matter candidate. We show that this setup allows for doubly blind spots at both collider searches for anomalies in the Higgs invisible decay width, and at direct Dark Matter detection. The blind spots originate from cancellations between interfering diagrams featuring different neutral scalar exchanges, and from cancellations driven by the two-Higgs doublet structure in the vertex coupling the singlet state with the Standard-Model-like Higgs. We demonstrate that the blind spots arise in a wide and generic array of realizations for the two-Higgs doublet model, including scenarios with a non-trivial flavor structure. We provide analytical formul{\ae} that describe the location of the blind spots in the theory parameter space, and we discuss the resulting phenomenology. |
1507.00352 | Hye-Sung Lee | Hooman Davoudiasl, Hye-Sung Lee, William J. Marciano | Low Q^2 Weak Mixing Angle Measurements and Rare Higgs Decays | Version to appear in PRD | Phys. Rev. D 92, 055005 (2015) | 10.1103/PhysRevD.92.055005 | CERN-PH-TH-2015-151 | hep-ph hep-ex nucl-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A weighted average weak mixing angle theta_W derived from relatively low Q^2
experiments is compared with the Standard Model prediction obtained from
precision measurements. The approximate 1.8 sigma discrepancy is fit with an
intermediate mass (~ 10-35 GeV) "dark" Z boson Z_d, corresponding to a U(1)_d
gauge symmetry of hidden dark matter, which couples to our world via kinetic
and Z-Z_d mass mixing. Constraints on such a scenario are obtained from
precision electroweak bounds and searches for the rare Higgs decays H -> Z Z_d
-> 4 charged leptons at the LHC. The sensitivity of future anticipated low Q^2
measurements of sin^2 theta_W(Q^2) to intermediate mass Z_d is also
illustrated. This dark Z scenario can provide interesting concomitant signals
in low energy parity violating measurements and rare Higgs decays at the LHC,
over the next few years.
| [
{
"created": "Wed, 1 Jul 2015 20:02:24 GMT",
"version": "v1"
},
{
"created": "Thu, 27 Aug 2015 16:13:24 GMT",
"version": "v2"
}
] | 2015-09-09 | [
[
"Davoudiasl",
"Hooman",
""
],
[
"Lee",
"Hye-Sung",
""
],
[
"Marciano",
"William J.",
""
]
] | A weighted average weak mixing angle theta_W derived from relatively low Q^2 experiments is compared with the Standard Model prediction obtained from precision measurements. The approximate 1.8 sigma discrepancy is fit with an intermediate mass (~ 10-35 GeV) "dark" Z boson Z_d, corresponding to a U(1)_d gauge symmetry of hidden dark matter, which couples to our world via kinetic and Z-Z_d mass mixing. Constraints on such a scenario are obtained from precision electroweak bounds and searches for the rare Higgs decays H -> Z Z_d -> 4 charged leptons at the LHC. The sensitivity of future anticipated low Q^2 measurements of sin^2 theta_W(Q^2) to intermediate mass Z_d is also illustrated. This dark Z scenario can provide interesting concomitant signals in low energy parity violating measurements and rare Higgs decays at the LHC, over the next few years. |
hep-ph/9205213 | Lowell Brown | Lowell S. Brown, Laurence G. Yaffe, and Chengxing Zhai | Large-order perturbation theory for the electromagnetic current-current
correlation function | 62 pages | Phys.Rev. D46 (1992) 4712-4735 | 10.1103/PhysRevD.46.4712 | null | hep-ph | null | The constraints imposed by asymptotic freedom and analyticity on the
large-order behavior of perturbation theory for the electromagnetic
current-current correlation function are examined. By suitably applying the
renormalization group, the coefficients of the asymptotic expansion in the deep
Euclidean region may be expressed explicitly in terms of the perturbative
coefficients of the Minkowski space discontinuity (the $R$-ratio in $e^+ e^-$
scattering). This relation yields a ``generic'' prediction for the large-order
behavior of the Euclidean perturbation series and suggests the presence of
non-perturbative $1/q^2$ correction in the Euclidian correlation function. No
such ``generic'' prediction can be made for the physically measurable
$R$-ratio. A novel functional method is developed to obtain these results.
| [
{
"created": "Sat, 9 May 1992 02:26:30 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Brown",
"Lowell S.",
""
],
[
"Yaffe",
"Laurence G.",
""
],
[
"Zhai",
"Chengxing",
""
]
] | The constraints imposed by asymptotic freedom and analyticity on the large-order behavior of perturbation theory for the electromagnetic current-current correlation function are examined. By suitably applying the renormalization group, the coefficients of the asymptotic expansion in the deep Euclidean region may be expressed explicitly in terms of the perturbative coefficients of the Minkowski space discontinuity (the $R$-ratio in $e^+ e^-$ scattering). This relation yields a ``generic'' prediction for the large-order behavior of the Euclidean perturbation series and suggests the presence of non-perturbative $1/q^2$ correction in the Euclidian correlation function. No such ``generic'' prediction can be made for the physically measurable $R$-ratio. A novel functional method is developed to obtain these results. |
2011.02529 | Nodoka Yamanaka | Nanako Shitara, Nodoka Yamanaka, Bijaya Kumar Sahoo, Toshio Watanabe,
Bhanu Pratap Das | CP violating effects in $^{210}$Fr and prospects for new physics beyond
the Standard Model | 17 pages, 6 figures, published version | JHEP02(2021)124 | 10.1007/JHEP02(2021)124 | null | hep-ph nucl-th physics.atom-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We report theoretical results of the electric dipole moment (EDM) of
$^{210}$Fr which arises from the interaction of the EDM of an electron with the
internal electric field in an atom and the scalar-pseudoscalar electron-nucleus
interaction; the two dominant sources of CP violation in this atom. Employing
the relativistic coupled-cluster theory, we evaluate the enhancement factors
for these two CP violating interactions to an accuracy of about 3% and analyze
the contributions of the many-body effects. These two quantities in combination
with the projected sensitivity of the $^{210}$Fr EDM experiment provide
constraints on new physics beyond the Standard Model. Particularly, we
demonstrate that their precise values are necessary to account for the effect
of the bottom quark in models in which the Higgs sector is augmented by
nonstandard Yukawa interactions such as the two-Higgs doublet model.
| [
{
"created": "Wed, 4 Nov 2020 20:51:20 GMT",
"version": "v1"
},
{
"created": "Sun, 21 Feb 2021 07:45:31 GMT",
"version": "v2"
}
] | 2021-02-23 | [
[
"Shitara",
"Nanako",
""
],
[
"Yamanaka",
"Nodoka",
""
],
[
"Sahoo",
"Bijaya Kumar",
""
],
[
"Watanabe",
"Toshio",
""
],
[
"Das",
"Bhanu Pratap",
""
]
] | We report theoretical results of the electric dipole moment (EDM) of $^{210}$Fr which arises from the interaction of the EDM of an electron with the internal electric field in an atom and the scalar-pseudoscalar electron-nucleus interaction; the two dominant sources of CP violation in this atom. Employing the relativistic coupled-cluster theory, we evaluate the enhancement factors for these two CP violating interactions to an accuracy of about 3% and analyze the contributions of the many-body effects. These two quantities in combination with the projected sensitivity of the $^{210}$Fr EDM experiment provide constraints on new physics beyond the Standard Model. Particularly, we demonstrate that their precise values are necessary to account for the effect of the bottom quark in models in which the Higgs sector is augmented by nonstandard Yukawa interactions such as the two-Higgs doublet model. |
2205.01021 | Zhen-hua Zhao | Zhen-hua Zhao | A split seesaw model with hidden neutrinoless double beta decay but
successful leptogenesis | 20 pages, 9 figures, version accepted for publication in EPJC | Eur. Phys. J. C (2022) 82:1020 | 10.1140/epjc/s10052-022-10989-4 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a paper by Asaka, Ishida and Tanaka \cite{hiding}, they proposed a novel
possibility (which will be referred to as the AIT ansatz) that, in spite of the
Majorana nature of neutrinos, the neutrinoless double beta ($0\nu \beta\beta$)
decay can be hidden. In the original AIT model, the AIT ansatz is realized in
the minimal seesaw model with two right-handed neutrinos which have a
hierarchical mass structure: the lighter and heavier right-handed neutrinos are
respectively much lighter and heavier than the typical Fermi-momentum scale of
nuclei. However, the original AIT model does not accommodate a successful
leptogenesis. For this problem, in this paper we study a split seesaw model
with one lighter right-handed neutrino but two heavier right-handed neutrinos
which can realize the AIT ansatz and accommodate a successful leptogenesis
simultaneously. We first give the condition on the neutrino Yukawa couplings
for realizing the AIT ansatz, discuss its realization by employing an Abelian
flavor symmetry, and study its implications for the mixing of the lighter
right-handed neutrino with three left-handed neutrinos. We then successively
study the implications for leptogenesis of the interesting scenarios where
$M^{}_{\rm D}$ is a triangular matrix (which has maximally-restricted texture
zeros, in line with the simplicity principle) or respects the $\mu$-$\tau$
reflection symmetry (which is well motivated by the experimental results), on
top of the AIT ansatz.
| [
{
"created": "Mon, 2 May 2022 16:48:51 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Nov 2022 08:33:13 GMT",
"version": "v2"
}
] | 2022-11-15 | [
[
"Zhao",
"Zhen-hua",
""
]
] | In a paper by Asaka, Ishida and Tanaka \cite{hiding}, they proposed a novel possibility (which will be referred to as the AIT ansatz) that, in spite of the Majorana nature of neutrinos, the neutrinoless double beta ($0\nu \beta\beta$) decay can be hidden. In the original AIT model, the AIT ansatz is realized in the minimal seesaw model with two right-handed neutrinos which have a hierarchical mass structure: the lighter and heavier right-handed neutrinos are respectively much lighter and heavier than the typical Fermi-momentum scale of nuclei. However, the original AIT model does not accommodate a successful leptogenesis. For this problem, in this paper we study a split seesaw model with one lighter right-handed neutrino but two heavier right-handed neutrinos which can realize the AIT ansatz and accommodate a successful leptogenesis simultaneously. We first give the condition on the neutrino Yukawa couplings for realizing the AIT ansatz, discuss its realization by employing an Abelian flavor symmetry, and study its implications for the mixing of the lighter right-handed neutrino with three left-handed neutrinos. We then successively study the implications for leptogenesis of the interesting scenarios where $M^{}_{\rm D}$ is a triangular matrix (which has maximally-restricted texture zeros, in line with the simplicity principle) or respects the $\mu$-$\tau$ reflection symmetry (which is well motivated by the experimental results), on top of the AIT ansatz. |
hep-ph/0602164 | Richard Thomson | Richard Thomson, Alex Pang, Chueng-Ryong Ji | Real and Virtual Nucleon Compton Scattering in the Perturbative Limit | 36 pages, 11 figures | Phys.Rev.D73:054023,2006 | 10.1103/PhysRevD.73.054023 | null | hep-ph | null | We present the results of calculations analyzing nucleon Compton scattering
to lowest order using perturbative QCD (pQCD) methods. Two scenarios are
considered: (1) the incoming photon is real; and (2) the incoming photon is
virtual. The case of a real photon has been previously analyzed at least 5
times using pQCD, but no two results are in agreement. Here it is shown that
our result agrees with that of Brooks and Dixon published in 2000. The case of
a virtual photon has been previously analyzed only once using pQCD. However,
doubt has been cast on the validity of that result. The results presented here
for virtual photon are believed to be more reliable. Some consideration is
given of how to compare these results with experiment. Following the lead of
Brooks and Dixon, for the proton, this involves normalizing the cross section
using the Dirac proton form factor, which we also calculate. Finally, there is
a comparison of our results with recent experiments.
| [
{
"created": "Fri, 17 Feb 2006 15:42:55 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Feb 2006 21:02:43 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Thomson",
"Richard",
""
],
[
"Pang",
"Alex",
""
],
[
"Ji",
"Chueng-Ryong",
""
]
] | We present the results of calculations analyzing nucleon Compton scattering to lowest order using perturbative QCD (pQCD) methods. Two scenarios are considered: (1) the incoming photon is real; and (2) the incoming photon is virtual. The case of a real photon has been previously analyzed at least 5 times using pQCD, but no two results are in agreement. Here it is shown that our result agrees with that of Brooks and Dixon published in 2000. The case of a virtual photon has been previously analyzed only once using pQCD. However, doubt has been cast on the validity of that result. The results presented here for virtual photon are believed to be more reliable. Some consideration is given of how to compare these results with experiment. Following the lead of Brooks and Dixon, for the proton, this involves normalizing the cross section using the Dirac proton form factor, which we also calculate. Finally, there is a comparison of our results with recent experiments. |
1909.10691 | Henry Lamm | Thomas D. Cohen, Henry Lamm, Richard F. Lebed | Precision Model-Independent Bounds from Global Analysis of $b \to c \ell
\nu$ Form Factors | 13 pages, 8 figures | Phys. Rev. D 100, 094503 (2019) | 10.1103/PhysRevD.100.094503 | null | hep-ph hep-ex hep-lat nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a model-independent global analysis of hadronic form factors for
the semileptonic decays $b\rightarrow c\ell\nu$ that exploits lattice-QCD data,
dispersion relations, and heavy-quark symmetries. The analysis yields
predictions for the relevant form factors, within quantifiable bounds. These
form factors are used to compute the semileptonic ratios $R(H_c)$ and various
decay-product polarizations. In particular, we find $R(D_s^*)=0.20(3)$ and
$R(J/\psi)=0.25(3)$, predictions that can be compared to results of upcoming
LHCb measurements. In developing this treatment, we obtain leading-order NRQCD
results for the nonzero-recoil relations between the $B_c^+ \rightarrow
\{J/\psi , \eta_c \}$ form factors.
| [
{
"created": "Tue, 24 Sep 2019 03:17:11 GMT",
"version": "v1"
}
] | 2019-11-20 | [
[
"Cohen",
"Thomas D.",
""
],
[
"Lamm",
"Henry",
""
],
[
"Lebed",
"Richard F.",
""
]
] | We present a model-independent global analysis of hadronic form factors for the semileptonic decays $b\rightarrow c\ell\nu$ that exploits lattice-QCD data, dispersion relations, and heavy-quark symmetries. The analysis yields predictions for the relevant form factors, within quantifiable bounds. These form factors are used to compute the semileptonic ratios $R(H_c)$ and various decay-product polarizations. In particular, we find $R(D_s^*)=0.20(3)$ and $R(J/\psi)=0.25(3)$, predictions that can be compared to results of upcoming LHCb measurements. In developing this treatment, we obtain leading-order NRQCD results for the nonzero-recoil relations between the $B_c^+ \rightarrow \{J/\psi , \eta_c \}$ form factors. |
1710.02695 | Anton Rebhan | Frederic Br\"unner and Anton Rebhan | Predictions for production and decay of the pseudoscalar glueball from
the Witten-Sakai-Sugimoto model | 1+4 pages, PoS contribution to EPS-HEP conference 5-12 July 2017,
Venice | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Witten-Sakai-Sugimoto model, a top-down gauge/gravity model of
large-$N_c$ low-energy QCD based on type-IIA string theory and $N_c$ D4 branes
with chiral quarks added by probe D8 branes, involves only one dimensionless
parameter, the 't Hooft coupling at its cutoff (Kaluza-Klein) scale. Although
this cutoff scale is around 1 GeV, the model has turned out to be surprisingly
predictive also quantitatively, reproducing masses of vector and axial vector
mesons, their decay rates, as well as the anomalous mass of the \eta' meson,
all within 10-30% errors. Using it as a guide for glueball signatures, we have
argued that it indicates that the meson $f_0(1710)$ may be a nearly pure
glueball, with rather specific predictions for the still-to-be-measured 4\pi
and \eta\eta' decays. Here we present our new predictions for the decay pattern
of the (very narrow) pseudoscalar glueball, which is closely related to the
U(1)$_A$ problem that the model is in fact handling correctly.
| [
{
"created": "Sat, 7 Oct 2017 14:52:33 GMT",
"version": "v1"
}
] | 2017-10-10 | [
[
"Brünner",
"Frederic",
""
],
[
"Rebhan",
"Anton",
""
]
] | The Witten-Sakai-Sugimoto model, a top-down gauge/gravity model of large-$N_c$ low-energy QCD based on type-IIA string theory and $N_c$ D4 branes with chiral quarks added by probe D8 branes, involves only one dimensionless parameter, the 't Hooft coupling at its cutoff (Kaluza-Klein) scale. Although this cutoff scale is around 1 GeV, the model has turned out to be surprisingly predictive also quantitatively, reproducing masses of vector and axial vector mesons, their decay rates, as well as the anomalous mass of the \eta' meson, all within 10-30% errors. Using it as a guide for glueball signatures, we have argued that it indicates that the meson $f_0(1710)$ may be a nearly pure glueball, with rather specific predictions for the still-to-be-measured 4\pi and \eta\eta' decays. Here we present our new predictions for the decay pattern of the (very narrow) pseudoscalar glueball, which is closely related to the U(1)$_A$ problem that the model is in fact handling correctly. |
2208.14219 | Wei Zhu | Wei Zhu, Qihui Chen, Zhiyi Cui and Jianhong Ruan | The gluon condensation in hadron collisions | 30 pages, 11 figures, 2 tables, Accepted for publication in NPB.
arXiv admin note: text overlap with arXiv:2109.09826 | Nuclear Physics B984 (2022) 115961 | 10.1016/j.nuclphysb.2022.115961 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Gluons may converge to a stable state at a critical momentum in hadrons. This
gluon condensation is predicted by a nonlinear QCD evolution equation. We
review the understanding of the gluon condensation and present a clear physical
picture that produces the gluon condensation from the colour glass condensate.
We summarize the applications of the GC effect in the $p-p(A)$ collisions and
predict that the $p-Pb$ and $Pb-Pb$ collisions at the LHC are close to the
energy region of the gluon condensation. We warn that for the next generation
of hadron colliders with the increasing of the collision energy, the extremely
strong gamma-rays will be emitted in a narrow space of the accelerator due to
the gluon condensation effect. Such artificial mini gamma-ray bursts in the
laboratory may damage the detectors.
| [
{
"created": "Tue, 30 Aug 2022 12:51:35 GMT",
"version": "v1"
}
] | 2022-09-28 | [
[
"Zhu",
"Wei",
""
],
[
"Chen",
"Qihui",
""
],
[
"Cui",
"Zhiyi",
""
],
[
"Ruan",
"Jianhong",
""
]
] | Gluons may converge to a stable state at a critical momentum in hadrons. This gluon condensation is predicted by a nonlinear QCD evolution equation. We review the understanding of the gluon condensation and present a clear physical picture that produces the gluon condensation from the colour glass condensate. We summarize the applications of the GC effect in the $p-p(A)$ collisions and predict that the $p-Pb$ and $Pb-Pb$ collisions at the LHC are close to the energy region of the gluon condensation. We warn that for the next generation of hadron colliders with the increasing of the collision energy, the extremely strong gamma-rays will be emitted in a narrow space of the accelerator due to the gluon condensation effect. Such artificial mini gamma-ray bursts in the laboratory may damage the detectors. |
1012.4587 | Thomas Hambye | Thomas Hambye | On the stability of particle dark matter | Talk presented at the "Identification of Dark Matter 2010"
conference, July 26-30, Montpellier, France | null | null | ULB-TH/10-40 | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | From the particle physics point of view, the most peculiar property of the
dark matter particle is its stability on cosmological time scales. We briefly
review the possible origins of this characteristic feature for candidates whose
relic density results from the thermal freeze-out of their annihilation. We
emphasize that each stabilization mechanism implies an all specific
phenomenology. The models reviewed include supersymmetric and
non-supersymmetric models where the stability is a consequence of
grand-unification, models where stability is due to an unbroken gauge group and
models where the DM stability is accidental. The latter possibility includes
minimal dark matter, hidden vector dark matter and composite DM models.
| [
{
"created": "Tue, 21 Dec 2010 10:10:12 GMT",
"version": "v1"
}
] | 2010-12-22 | [
[
"Hambye",
"Thomas",
""
]
] | From the particle physics point of view, the most peculiar property of the dark matter particle is its stability on cosmological time scales. We briefly review the possible origins of this characteristic feature for candidates whose relic density results from the thermal freeze-out of their annihilation. We emphasize that each stabilization mechanism implies an all specific phenomenology. The models reviewed include supersymmetric and non-supersymmetric models where the stability is a consequence of grand-unification, models where stability is due to an unbroken gauge group and models where the DM stability is accidental. The latter possibility includes minimal dark matter, hidden vector dark matter and composite DM models. |
2312.10566 | Igor Samsonov | V.A. Dzuba, V.V. Flambaum, I.B. Samsonov | Migdal-type effect in the dark matter absorption process | 7 pages + appendices; journal version | null | null | null | hep-ph hep-ex physics.atom-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a new mechanism of absorption of dark matter particles in atoms
which resembles the Migdal effect of inelastic dark matter scattering. In this
process, atom may be ionized upon absorption of a scalar particle through the
scalar-nucleon Yukawa-type interaction. The crucial difference from the
inelastic dark matter scattering on atoms is that the total energy of the
particle, including its rest mass $mc^2$-term, is transferred to the electron.
As a result, the emitted electron kinetic energy is about six orders in
magnitude bigger than that in the dark matter scattering process. This
absorption process allows one to probe dark matter particles with a relatively
small mass, in the range from 1 to 100 keV, that cannot be detected in the
scattering process. It is also possible to detect hypothetical scalar particles
emitted from the Sun. We calculate absorption cross sections of this process in
Na, Si, Ar, Ge, I, Xe, and Tl target atoms and extract limits on the
scalar-nucleon interaction constant from null results of XENONnT experiment.
| [
{
"created": "Sun, 17 Dec 2023 00:15:10 GMT",
"version": "v1"
},
{
"created": "Sun, 9 Jun 2024 08:51:38 GMT",
"version": "v2"
}
] | 2024-06-11 | [
[
"Dzuba",
"V. A.",
""
],
[
"Flambaum",
"V. V.",
""
],
[
"Samsonov",
"I. B.",
""
]
] | We propose a new mechanism of absorption of dark matter particles in atoms which resembles the Migdal effect of inelastic dark matter scattering. In this process, atom may be ionized upon absorption of a scalar particle through the scalar-nucleon Yukawa-type interaction. The crucial difference from the inelastic dark matter scattering on atoms is that the total energy of the particle, including its rest mass $mc^2$-term, is transferred to the electron. As a result, the emitted electron kinetic energy is about six orders in magnitude bigger than that in the dark matter scattering process. This absorption process allows one to probe dark matter particles with a relatively small mass, in the range from 1 to 100 keV, that cannot be detected in the scattering process. It is also possible to detect hypothetical scalar particles emitted from the Sun. We calculate absorption cross sections of this process in Na, Si, Ar, Ge, I, Xe, and Tl target atoms and extract limits on the scalar-nucleon interaction constant from null results of XENONnT experiment. |
2112.00975 | Muhammad Ajaz | Muhammad Waqas, Guang-Xiong Peng, Muhammad Ajaz, Abd Al Karim Haj
Ismail, Pei-Pin Yang, Zafar Wazir | Extraction of freezeout parameters and their dependence on collision
energy and collision cross-section | 8 pages, 3 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We used the Blast wave model with Boltzmann Gibbs statistics and analyzed the
experimental data of transverse momentum spectra ($p_T$) measured by NA61/SHINE
and NA 49 Collaborations in inelastic (INEL) proton-proton, and the most
central Beryllium-Beryllium (Be-Be), Argon-Scandium (Ar-Sc) and Lead-Lead
(Pb-Pb) collisions. The model results fit the experimental data of NA61/SHINE
and NA 49 Collaborations very well. We extracted kinetic freezeout temperature,
transverse flow velocity and kinetic freezeout volume directly from the
spectra. We also calculated mean transverse momentum and initial temperature
from the fit function. It is observed that the kinetic freezeout temperature
increases with increasing the collision energy as well as collision
cross-section (size of the colliding system). Furthermore, the transverse flow
remains unchanged with increasing the collision energy, while it changes
randomly with the collision cross-section. Similarly, with the increase in
collision energy or the collision cross-section, the freeze-out volume and the
average $p_T$ increase. The initial temperature is also observed to be an
increasing function of the collision cross-section.
| [
{
"created": "Thu, 2 Dec 2021 04:17:27 GMT",
"version": "v1"
}
] | 2021-12-03 | [
[
"Waqas",
"Muhammad",
""
],
[
"Peng",
"Guang-Xiong",
""
],
[
"Ajaz",
"Muhammad",
""
],
[
"Ismail",
"Abd Al Karim Haj",
""
],
[
"Yang",
"Pei-Pin",
""
],
[
"Wazir",
"Zafar",
""
]
] | We used the Blast wave model with Boltzmann Gibbs statistics and analyzed the experimental data of transverse momentum spectra ($p_T$) measured by NA61/SHINE and NA 49 Collaborations in inelastic (INEL) proton-proton, and the most central Beryllium-Beryllium (Be-Be), Argon-Scandium (Ar-Sc) and Lead-Lead (Pb-Pb) collisions. The model results fit the experimental data of NA61/SHINE and NA 49 Collaborations very well. We extracted kinetic freezeout temperature, transverse flow velocity and kinetic freezeout volume directly from the spectra. We also calculated mean transverse momentum and initial temperature from the fit function. It is observed that the kinetic freezeout temperature increases with increasing the collision energy as well as collision cross-section (size of the colliding system). Furthermore, the transverse flow remains unchanged with increasing the collision energy, while it changes randomly with the collision cross-section. Similarly, with the increase in collision energy or the collision cross-section, the freeze-out volume and the average $p_T$ increase. The initial temperature is also observed to be an increasing function of the collision cross-section. |
hep-ph/9701243 | Markus Finkemeier | Markus Finkemeier, Howard Georgi, Matt McIrvin (Harvard University) | Reparameterization Invariance Revisited | 20 pages, no figures, Latex. Revised version: Discussion of
reparameterization invariance constraints on class-II operators added | Phys.Rev.D55:6933-6943,1997 | 10.1103/PhysRevD.55.6933 | HUTP-96/A053 | hep-ph | null | Reparameterization invariance, a symmetry of heavy quark effective theory,
appears in different forms in the literature. The most commonly cited forms of
the reparameterization transformation are shown to induce the same constraints
on operators that do not vanish under the equation of motion to order $1/m^2$,
and to be related by a redefinition of the heavy quark field. We give a new,
very straightforward proof that that the reparameterization invariance
constraints apply to all orders in $\alpha_s$ under matching to full QCD and
renormalization-group running, at least up to and including $O(1/m^2)$.
| [
{
"created": "Tue, 7 Jan 1997 22:35:47 GMT",
"version": "v1"
},
{
"created": "Sat, 25 Jan 1997 01:17:24 GMT",
"version": "v2"
}
] | 2009-09-11 | [
[
"Finkemeier",
"Markus",
"",
"Harvard University"
],
[
"Georgi",
"Howard",
"",
"Harvard University"
],
[
"McIrvin",
"Matt",
"",
"Harvard University"
]
] | Reparameterization invariance, a symmetry of heavy quark effective theory, appears in different forms in the literature. The most commonly cited forms of the reparameterization transformation are shown to induce the same constraints on operators that do not vanish under the equation of motion to order $1/m^2$, and to be related by a redefinition of the heavy quark field. We give a new, very straightforward proof that that the reparameterization invariance constraints apply to all orders in $\alpha_s$ under matching to full QCD and renormalization-group running, at least up to and including $O(1/m^2)$. |
2006.07717 | Christoph Peter Hofmann | Christoph P. Hofmann | Chiral Perturbation Theory Analysis of the Quark Condensate in a
Magnetic Field | 27 pages, 4 figures | Phys. Rev. D 102, 094010 (2020) | 10.1103/PhysRevD.102.094010 | null | hep-ph hep-lat hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present two-loop results for the quark condensate in an external magnetic
field within chiral perturbation theory using coordinate space techniques. At
finite temperature, we explore the impact of the magnetic field on the
pion-pion interaction in the quark condensate for arbitrary pion masses and
derive the correct weak magnetic field expansion in the chiral limit. At zero
temperature, we provide the complete two-loop representation for the vacuum
energy density and the quark condensate.
| [
{
"created": "Sat, 13 Jun 2020 20:46:02 GMT",
"version": "v1"
}
] | 2020-11-18 | [
[
"Hofmann",
"Christoph P.",
""
]
] | We present two-loop results for the quark condensate in an external magnetic field within chiral perturbation theory using coordinate space techniques. At finite temperature, we explore the impact of the magnetic field on the pion-pion interaction in the quark condensate for arbitrary pion masses and derive the correct weak magnetic field expansion in the chiral limit. At zero temperature, we provide the complete two-loop representation for the vacuum energy density and the quark condensate. |
1111.3158 | Marc Wagner | Falk Bruckmann, Simon Dinter, Ernst-Michael Ilgenfritz, Benjamin
Maier, Michael Muller-Preussker, Marc Wagner | Confining dyon gas with finite-volume effects under control | 23 pages, 4 figures; minor modifications | Phys.Rev.D85:034502,2012 | 10.1103/PhysRevD.85.034502 | HU-EP-11/50; SFB/CPP-11-59; DESY 11-211 | hep-ph hep-lat hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | As an approach to describe the long-range properties of non-Abelian gauge
theories at non-zero temperature T < T_c, we consider a non-interacting
ensemble of dyons (magnetic monopoles) with non-trivial holonomy. We show
analytically, that the quark-antiquark free energy from the Polyakov loop
correlator grows linearly with the distance, and how the string tension scales
with the dyon density. In numerical treatments, the long-range tails of the
dyon fields cause severe finite-volume effects. Therefore, we demonstrate the
application of Ewald's summation method to this system. Finite-volume effects
are shown to be under control, which is a crucial requirement for numerical
studies of interacting dyon ensembles.
| [
{
"created": "Mon, 14 Nov 2011 09:53:00 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Jan 2012 15:56:23 GMT",
"version": "v2"
}
] | 2012-02-16 | [
[
"Bruckmann",
"Falk",
""
],
[
"Dinter",
"Simon",
""
],
[
"Ilgenfritz",
"Ernst-Michael",
""
],
[
"Maier",
"Benjamin",
""
],
[
"Muller-Preussker",
"Michael",
""
],
[
"Wagner",
"Marc",
""
]
] | As an approach to describe the long-range properties of non-Abelian gauge theories at non-zero temperature T < T_c, we consider a non-interacting ensemble of dyons (magnetic monopoles) with non-trivial holonomy. We show analytically, that the quark-antiquark free energy from the Polyakov loop correlator grows linearly with the distance, and how the string tension scales with the dyon density. In numerical treatments, the long-range tails of the dyon fields cause severe finite-volume effects. Therefore, we demonstrate the application of Ewald's summation method to this system. Finite-volume effects are shown to be under control, which is a crucial requirement for numerical studies of interacting dyon ensembles. |
hep-ph/0606199 | Alvaro de Rujula | Arnon Dar and Alvaro De Rujula | A theory of Cosmic Rays | Updated to discuss recent data, mainly from Auger | Phys.Rept.466:179-241,2008 | 10.1016/j.physrep.2008.05.004 | null | hep-ph astro-ph | null | We present a theory of non-solar cosmic rays (CRs) in which the bulk of their
observed flux is due to a single type of CR source at all energies. The total
luminosity of the Galaxy, the broken power-law spectra with their observed
slopes, the position of the `knee(s)' and `ankle', and the CR composition and
its variation with energy are all predicted in terms of very simple and
completely `standard' physics. The source of CRs is extremely `economical': it
has only one parameter to be fitted to the ensemble of all of the mentioned
data. All other inputs are `priors', that is, theoretical or observational
items of information independent of the properties of the source of CRs, and
chosen to lie in their pre-established ranges. The theory is part of a `unified
view of high-energy astrophysics' --based on the `Cannonball' model of the
relativistic ejecta of accreting black holes and neutron stars. The model has
been extremely successful in predicting all the novel properties of Gamma Ray
Bursts recently observed with help of the Swift satellite. If correct, this
model is only lacking a satisfactory theoretical understanding of the `cannon'
that emits the cannonballs in catastrophic processes of accretion.
| [
{
"created": "Mon, 19 Jun 2006 15:11:54 GMT",
"version": "v1"
},
{
"created": "Wed, 7 May 2008 13:39:29 GMT",
"version": "v2"
}
] | 2009-09-29 | [
[
"Dar",
"Arnon",
""
],
[
"De Rujula",
"Alvaro",
""
]
] | We present a theory of non-solar cosmic rays (CRs) in which the bulk of their observed flux is due to a single type of CR source at all energies. The total luminosity of the Galaxy, the broken power-law spectra with their observed slopes, the position of the `knee(s)' and `ankle', and the CR composition and its variation with energy are all predicted in terms of very simple and completely `standard' physics. The source of CRs is extremely `economical': it has only one parameter to be fitted to the ensemble of all of the mentioned data. All other inputs are `priors', that is, theoretical or observational items of information independent of the properties of the source of CRs, and chosen to lie in their pre-established ranges. The theory is part of a `unified view of high-energy astrophysics' --based on the `Cannonball' model of the relativistic ejecta of accreting black holes and neutron stars. The model has been extremely successful in predicting all the novel properties of Gamma Ray Bursts recently observed with help of the Swift satellite. If correct, this model is only lacking a satisfactory theoretical understanding of the `cannon' that emits the cannonballs in catastrophic processes of accretion. |
hep-ph/9403231 | Randall J. Scalise | John C. Collins and Randall J. Scalise | The Renormalization of Composite Operators in Yang-Mills Theories Using
General Covariant Gauge | 52 pages, uuencoded compressed PostScript, PSU/TH/141. [Minor typo-
graphical errors in the references and in Eqs. (A.5) and (A.7) corrected.] | Phys.Rev. D50 (1994) 4117-4136 | 10.1103/PhysRevD.50.4117 | null | hep-ph hep-th | null | Essential to QCD applications of the operator product expansion, etc., is a
knowledge of those operators that mix with gauge-invariant operators. A
standard theorem asserts that the renormalization matrix is triangular:
Gauge-invariant operators have `alien' gauge-variant operators among their
counterterms, but, with a suitably chosen basis, the necessary alien operators
have only themselves as counterterms. Moreover, the alien operators are
supposed to vanish in physical matrix elements. A recent calculation by Hamberg
and van Neerven apparently contradicts these results. By explicit calculations
with the energy-momentum tensor, we show that the problems arise because of
subtle infra-red singularities that appear when gluonic matrix elements are
taken on-shell at zero momentum transfer.
Keywords: twist-two covariant gluon operator, finite part, mixing,
non-abelian, anomalous dimension, Ward identity, BRST, modified LSZ reduction,
Dixon, Taylor, Joglekar, Lee.
| [
{
"created": "Fri, 4 Mar 1994 16:37:33 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Mar 1994 21:08:16 GMT",
"version": "v2"
}
] | 2009-10-28 | [
[
"Collins",
"John C.",
""
],
[
"Scalise",
"Randall J.",
""
]
] | Essential to QCD applications of the operator product expansion, etc., is a knowledge of those operators that mix with gauge-invariant operators. A standard theorem asserts that the renormalization matrix is triangular: Gauge-invariant operators have `alien' gauge-variant operators among their counterterms, but, with a suitably chosen basis, the necessary alien operators have only themselves as counterterms. Moreover, the alien operators are supposed to vanish in physical matrix elements. A recent calculation by Hamberg and van Neerven apparently contradicts these results. By explicit calculations with the energy-momentum tensor, we show that the problems arise because of subtle infra-red singularities that appear when gluonic matrix elements are taken on-shell at zero momentum transfer. Keywords: twist-two covariant gluon operator, finite part, mixing, non-abelian, anomalous dimension, Ward identity, BRST, modified LSZ reduction, Dixon, Taylor, Joglekar, Lee. |
1702.02924 | Jusak Tandean | Chia-Feng Chang, Xiao-Gang He, Jusak Tandean | Two-Higgs-Doublet-Portal Dark-Matter Models in Light of Direct Search
and LHC Data | 26 pages, 10 figures, somewhat expanded, references added, main
conclusions unchanged, matches publication | JHEP 04 (2017) 107 | 10.1007/JHEP04(2017)107 | NCTS-PH/1707 | hep-ph astro-ph.CO hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore simple Higgs-portal models of dark matter (DM) with spin 1/2, 3/2,
and 1, respectively, applying to them constraints from the LUX and PandaX-II
direct detection experiments and from LHC measurements on the 125-GeV Higgs
boson. With only one Higgs doublet, we find that the spin-1/2 DM having a
purely scalar effective coupling to the doublet is viable only in a narrow
range of mass near the Higgs pole, whereas the vector DM is still allowed if
its mass is also close to the Higgs pole or exceeds 1.4 TeV, both in line with
earlier analyses. Moreover, the spin-3/2 DM is in a roughly similar situation
to the spin-1/2 DM, but has surviving parameter space which is even more
restricted. We also consider the two-Higgs-doublet extension of each of the
preceding models, assuming that the expanded Yukawa sector is that of the
two-Higgs-doublet model of type II. We show that in these
two-Higgs-doublet-portal models significant portions of the DM mass regions
excluded in the simplest scenarios by direct search bounds can be reclaimed due
to suppression of the effective DM interactions with nucleons at some ratios of
the $CP$-even Higgs bosons' couplings to the up and down quarks. The regained
parameter space contains areas which can yield a DM-nucleon scattering
cross-section that is far less than its current experimental limit or even goes
below the neutrino-background floor.
| [
{
"created": "Thu, 9 Feb 2017 18:15:28 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Apr 2017 13:32:18 GMT",
"version": "v2"
}
] | 2017-04-21 | [
[
"Chang",
"Chia-Feng",
""
],
[
"He",
"Xiao-Gang",
""
],
[
"Tandean",
"Jusak",
""
]
] | We explore simple Higgs-portal models of dark matter (DM) with spin 1/2, 3/2, and 1, respectively, applying to them constraints from the LUX and PandaX-II direct detection experiments and from LHC measurements on the 125-GeV Higgs boson. With only one Higgs doublet, we find that the spin-1/2 DM having a purely scalar effective coupling to the doublet is viable only in a narrow range of mass near the Higgs pole, whereas the vector DM is still allowed if its mass is also close to the Higgs pole or exceeds 1.4 TeV, both in line with earlier analyses. Moreover, the spin-3/2 DM is in a roughly similar situation to the spin-1/2 DM, but has surviving parameter space which is even more restricted. We also consider the two-Higgs-doublet extension of each of the preceding models, assuming that the expanded Yukawa sector is that of the two-Higgs-doublet model of type II. We show that in these two-Higgs-doublet-portal models significant portions of the DM mass regions excluded in the simplest scenarios by direct search bounds can be reclaimed due to suppression of the effective DM interactions with nucleons at some ratios of the $CP$-even Higgs bosons' couplings to the up and down quarks. The regained parameter space contains areas which can yield a DM-nucleon scattering cross-section that is far less than its current experimental limit or even goes below the neutrino-background floor. |
1305.3493 | Pere Masjuan | Pere Masjuan, Enrique Ruiz Arriola, and Wojciech Broniowski | Reply to "Comment on 'Systematics of radial and angular-momentum Regge
trajectories of light non-strange qqbar-states' " | 3 pages, 2 figures. Version to appear in Phys.Rev. D | null | 10.1103/PhysRevD.87.118502 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In his Comment, D. Bugg argues against our usage of the PDG collection of
light non-strange states together with the half-width rule to analyze the
linearity of radial and angular-moment Regge trajectories in the large-N_c
limit. After taking into account his observations on our choice of data, the
radial Regge trajectories are again analyzed. We still find that our conclusion
on the lack of universality between radial- and angular-momentum Regge
trajectories is valid.
| [
{
"created": "Wed, 15 May 2013 14:28:43 GMT",
"version": "v1"
}
] | 2015-06-15 | [
[
"Masjuan",
"Pere",
""
],
[
"Arriola",
"Enrique Ruiz",
""
],
[
"Broniowski",
"Wojciech",
""
]
] | In his Comment, D. Bugg argues against our usage of the PDG collection of light non-strange states together with the half-width rule to analyze the linearity of radial and angular-moment Regge trajectories in the large-N_c limit. After taking into account his observations on our choice of data, the radial Regge trajectories are again analyzed. We still find that our conclusion on the lack of universality between radial- and angular-momentum Regge trajectories is valid. |
2308.06389 | Stephen Mrenna | Stefano Frixione, Simone Amoroso, Stephen Mrenna | Matrix element corrections in the Pythia8 parton shower in the context
of matched simulations at next-to-leading order | 16 pages, 9 figures | null | null | FERMILAB-PUB-23-413-CSAID | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We discuss the role of matrix element corrections (MEC) to parton showers in
the context of MC@NLO-type matchings for processes that feature unstable
resonances, where MEC are liable to result in double-counting issues, and are
thus generally not employed. By working with Pythia8, we show that disabling
all MEC is actually unnecessary in computations based on the narrow-width
approximation, and we propose alternative MEC settings which, while still
avoiding double counting, allow one to include hard-recoil effects in the
simulations of resonance decays. We illustrate our findings by considering
top-antitop production at the LHC, and by comparing MadGraph_aMC@NLO
predictions with those of POWHEG-BOX and standalone Pythia8.
| [
{
"created": "Fri, 11 Aug 2023 21:11:13 GMT",
"version": "v1"
}
] | 2023-08-15 | [
[
"Frixione",
"Stefano",
""
],
[
"Amoroso",
"Simone",
""
],
[
"Mrenna",
"Stephen",
""
]
] | We discuss the role of matrix element corrections (MEC) to parton showers in the context of MC@NLO-type matchings for processes that feature unstable resonances, where MEC are liable to result in double-counting issues, and are thus generally not employed. By working with Pythia8, we show that disabling all MEC is actually unnecessary in computations based on the narrow-width approximation, and we propose alternative MEC settings which, while still avoiding double counting, allow one to include hard-recoil effects in the simulations of resonance decays. We illustrate our findings by considering top-antitop production at the LHC, and by comparing MadGraph_aMC@NLO predictions with those of POWHEG-BOX and standalone Pythia8. |
hep-ph/9706413 | null | Sergio Scopetta and Vicente Vento (Valencia) | A quark model analysis of the transversity distribution | 10 pages, Latex; 4 postscript figures generated by epsf.sty included
in submission | Phys.Lett. B424 (1998) 25-32 | 10.1016/S0370-2693(98)00212-3 | FTUV 97-29; IFIC 97-29 | hep-ph | null | The feasibility of measuring chiral-odd parton distribution functions in
polarized Drell-Yan and semi-inclusive experiments has renewed theoretical
interest in their study. Models of hadron structure have proven succesful in
describing the gross features of the chiral-even structure functions. Similar
expectations support our study of the transversity parton distributions in the
Isgur-Karl and MIT bag models. We confirm the diverse low x behavior of the
transversity and spin structure functions at the experimental scale and show
that it is fundamentally a consequence of the different behavior under
evolution of these functions. The inequalities of Soffer establish constraints
between data and model calculations of the chiral-odd transversity function.
The approximate compatibility of our model calculations with these constraints
conferes credibility to our estimates.
| [
{
"created": "Thu, 19 Jun 1997 09:27:38 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Scopetta",
"Sergio",
"",
"Valencia"
],
[
"Vento",
"Vicente",
"",
"Valencia"
]
] | The feasibility of measuring chiral-odd parton distribution functions in polarized Drell-Yan and semi-inclusive experiments has renewed theoretical interest in their study. Models of hadron structure have proven succesful in describing the gross features of the chiral-even structure functions. Similar expectations support our study of the transversity parton distributions in the Isgur-Karl and MIT bag models. We confirm the diverse low x behavior of the transversity and spin structure functions at the experimental scale and show that it is fundamentally a consequence of the different behavior under evolution of these functions. The inequalities of Soffer establish constraints between data and model calculations of the chiral-odd transversity function. The approximate compatibility of our model calculations with these constraints conferes credibility to our estimates. |
hep-ph/0209033 | Gubankova | E. Gubankova | Diquark interaction and gaps for color superconductivity | 3 pages, Lattice2002(nonzerot), talk presented at 20th International
Symposium on Lattice Field Theory (LATTICE2002), Boston, Massachusetts, 24-29
June 2002 | null | 10.1016/S0920-5632(03)01621-9 | null | hep-ph | null | Using flow equations, we derive an effective quark-quark interaction and
obtain the coupled set of gap equations for the condensates of the CFL phase of
massless $N_f=3$ dense QCD. The formalism developed here enables one to
consider more general case of nonzero $s$-quark mass.
| [
{
"created": "Tue, 3 Sep 2002 21:56:56 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Gubankova",
"E.",
""
]
] | Using flow equations, we derive an effective quark-quark interaction and obtain the coupled set of gap equations for the condensates of the CFL phase of massless $N_f=3$ dense QCD. The formalism developed here enables one to consider more general case of nonzero $s$-quark mass. |
1507.06522 | R. Sekhar Chivukula | R. Sekhar Chivukula, Elizabeth H. Simmons, and Natascia Vignaroli | The Jet Energy Profile: A BSM Analysis Tool | 15 pages, contribution to Sakata Memorial KMI Workshop on "Origin of
Mass and Strong Coupling Gauge Theories (SCGT15)", 3-6 March 2015, Nagoya
University | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A new heavy di-jet resonance could be discovered at the 14 TeV LHC. In this
talk we present a strategy to reveal the nature of such a particle; in
particular to discern whether it is a quark-antiquark (q qbar), quark-gluon
(qg), or gluon-gluon (gg) resonance. The strategy is based on the study of the
energy profiles of the two leading jets in the di-jet channel. Including
statistical uncertainties in the signal and the QCD backgrounds, we show that
one can distinguish between gg, qg, and q bar resonances; an evaluation of
systematic uncertainties in the measurement of the jet energy profile will
require a detailed detector study once sufficient 14 TeV di-jet data is in
hand.
| [
{
"created": "Thu, 23 Jul 2015 15:04:42 GMT",
"version": "v1"
}
] | 2015-07-24 | [
[
"Chivukula",
"R. Sekhar",
""
],
[
"Simmons",
"Elizabeth H.",
""
],
[
"Vignaroli",
"Natascia",
""
]
] | A new heavy di-jet resonance could be discovered at the 14 TeV LHC. In this talk we present a strategy to reveal the nature of such a particle; in particular to discern whether it is a quark-antiquark (q qbar), quark-gluon (qg), or gluon-gluon (gg) resonance. The strategy is based on the study of the energy profiles of the two leading jets in the di-jet channel. Including statistical uncertainties in the signal and the QCD backgrounds, we show that one can distinguish between gg, qg, and q bar resonances; an evaluation of systematic uncertainties in the measurement of the jet energy profile will require a detailed detector study once sufficient 14 TeV di-jet data is in hand. |
hep-ph/0411353 | Eiji Nakano | E. Nakano, T. Suzuki and H. Yabu | Colour-SU(3)-Ginzburg-Landau Effective Potential for Order Parameter
with $3 \times 3$ Symmetry II : A Complete Classification of Phase Diagrams | 14 pages, 11 figures | null | null | null | hep-ph | null | Phase structure is studied for a system which has symmetry group SU(3) and is
described by SU(3)-${\bf 3 \times 3}$ order parameter. The study is rested on
SU(3)-Ginzburg-Landau effective potential constructed as a preliminary.
| [
{
"created": "Sat, 27 Nov 2004 07:19:14 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Nakano",
"E.",
""
],
[
"Suzuki",
"T.",
""
],
[
"Yabu",
"H.",
""
]
] | Phase structure is studied for a system which has symmetry group SU(3) and is described by SU(3)-${\bf 3 \times 3}$ order parameter. The study is rested on SU(3)-Ginzburg-Landau effective potential constructed as a preliminary. |
1901.07399 | Kazem Azizi | N. Er, K. Azizi | Fate of the doubly heavy spin$-3/2$ baryons in a dense medium | 24 Pages, 5 Figures and 3 Tables | Phys. Rev. D 99, 074012 (2019) | 10.1103/PhysRevD.99.074012 | null | hep-ph hep-ex hep-lat nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the behavior of the doubly heavy spin$-3/2$ baryons in cold
nuclear matter. In particular, we study the variations of the spectroscopic
parameters of the ground state $\Xi^*_{QQ'}$ and $\Omega^*_{QQ'}$ particles,
with $ Q $ and $ Q' $ being $b $ or $ c $ quark, with respect to the changes in
the density of the nuclear medium. We find the shifts on the parameters under
question at saturation medium density compared to their vacuum values. It is
observed that the parameters of the $\Xi^*_{QQ'}$ states containing two heavy
quarks and one up or down quark are affected by the medium, considerably. The
parameters of the $\Omega^*_{QQ'}$ states containing two heavy quarks and one
strange quark, however, do not show any sensitivity to the density of the cold
nuclear medium. We also discuss the variations of the vector self-energy at
each channel with respect to the changes in the density. The negative shifts in
the mass of $\Xi^*_{QQ'}$ states due to nucleons in the medium can be used to
study the doubly heavy baryons' interactions with the nucleons. The results
obtained can also be used in analyses of the results of the future in-medium
experiments.
| [
{
"created": "Tue, 22 Jan 2019 15:12:23 GMT",
"version": "v1"
},
{
"created": "Fri, 1 Feb 2019 12:58:25 GMT",
"version": "v2"
},
{
"created": "Wed, 27 Mar 2019 07:29:03 GMT",
"version": "v3"
},
{
"created": "Thu, 4 Apr 2019 11:18:08 GMT",
"version": "v4"
}
] | 2019-04-17 | [
[
"Er",
"N.",
""
],
[
"Azizi",
"K.",
""
]
] | We investigate the behavior of the doubly heavy spin$-3/2$ baryons in cold nuclear matter. In particular, we study the variations of the spectroscopic parameters of the ground state $\Xi^*_{QQ'}$ and $\Omega^*_{QQ'}$ particles, with $ Q $ and $ Q' $ being $b $ or $ c $ quark, with respect to the changes in the density of the nuclear medium. We find the shifts on the parameters under question at saturation medium density compared to their vacuum values. It is observed that the parameters of the $\Xi^*_{QQ'}$ states containing two heavy quarks and one up or down quark are affected by the medium, considerably. The parameters of the $\Omega^*_{QQ'}$ states containing two heavy quarks and one strange quark, however, do not show any sensitivity to the density of the cold nuclear medium. We also discuss the variations of the vector self-energy at each channel with respect to the changes in the density. The negative shifts in the mass of $\Xi^*_{QQ'}$ states due to nucleons in the medium can be used to study the doubly heavy baryons' interactions with the nucleons. The results obtained can also be used in analyses of the results of the future in-medium experiments. |
hep-ph/9602314 | null | M. Kacir, M. Prakash and I. Zahed | Hadrons and QCD Instantons: a Bosonized View | 59 pages LaTex, 42 postscript file figures | Acta Phys.Polon. B30 (1999) 287-348 | null | SUNY-NTG-95-05 | hep-ph | null | In a dilute system of instantons and antiinstantons, the U$_{\rm A}$(1) and
scale anomalies are shown to be directly related to the bulk susceptibility and
compressibility of the system. Using $1/N_c$ (where $N_c$ is the number of
colors) as a book-keeping argument, mesonic, baryonic and gluonic correlators
are worked out in p-space and Fourier transformed to x-space for a comparison
with recently simulated correlators. The results are in overall agreement with
simulations and lattice calculations, for distances up to 1.5 fm, despite the
fact that some channels lack the necessary physical singularities. We analyze
various space-like form factors of the nucleon and show that they are amenable
to constituent quark form factors to leading order in $1/N_c$. Issues related
to the lack of confinement in the model and its consequence on the various
correlation functions and form factors are also discussed.
| [
{
"created": "Wed, 14 Feb 1996 20:34:53 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kacir",
"M.",
""
],
[
"Prakash",
"M.",
""
],
[
"Zahed",
"I.",
""
]
] | In a dilute system of instantons and antiinstantons, the U$_{\rm A}$(1) and scale anomalies are shown to be directly related to the bulk susceptibility and compressibility of the system. Using $1/N_c$ (where $N_c$ is the number of colors) as a book-keeping argument, mesonic, baryonic and gluonic correlators are worked out in p-space and Fourier transformed to x-space for a comparison with recently simulated correlators. The results are in overall agreement with simulations and lattice calculations, for distances up to 1.5 fm, despite the fact that some channels lack the necessary physical singularities. We analyze various space-like form factors of the nucleon and show that they are amenable to constituent quark form factors to leading order in $1/N_c$. Issues related to the lack of confinement in the model and its consequence on the various correlation functions and form factors are also discussed. |
1509.06436 | Zhi-Gang Wang | Zhi-Gang Wang | Analysis of the ${\frac{1}{2}}^{\pm}$ pentaquark states in the
diquark-diquark-antiquark model with QCD sum rules | 34 pages, 16 figures. arXiv admin note: substantial text overlap with
arXiv:1508.04189 | Eur.Phys.J.C76 (2016) 142 | 10.1140/epjc/s10052-016-3983-2 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article, we construct both the
axialvector-diquark-axialvector-diquark-antiquark type and
axialvector-diquark-scalar-diquark-antiquark type interpolating currents, then
calculate the contributions of the vacuum condensates up to dimension-10 in the
operator product expansion, and study the masses and pole residues of the
$J^P={\frac{1}{2}}^\pm$ hidden-charm pentaquark states with the QCD sum rules
in a systematic way. In calculations, we use the formula
$\mu=\sqrt{M^2_{P}-(2{\mathbb{M}}_c)^2}$ to determine the energy scales of the
QCD spectral densities. We take into account the $SU(3)$ breaking effects of
the light quarks, and obtain the masses of the hidden charm pentaquark states
with the strangeness $S=0,\,-1,\,-2,\,-3$, which can be confronted with the
experimental data in the future.
| [
{
"created": "Tue, 22 Sep 2015 00:55:07 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Dec 2015 02:16:19 GMT",
"version": "v2"
},
{
"created": "Tue, 16 Feb 2016 03:30:25 GMT",
"version": "v3"
}
] | 2016-03-16 | [
[
"Wang",
"Zhi-Gang",
""
]
] | In this article, we construct both the axialvector-diquark-axialvector-diquark-antiquark type and axialvector-diquark-scalar-diquark-antiquark type interpolating currents, then calculate the contributions of the vacuum condensates up to dimension-10 in the operator product expansion, and study the masses and pole residues of the $J^P={\frac{1}{2}}^\pm$ hidden-charm pentaquark states with the QCD sum rules in a systematic way. In calculations, we use the formula $\mu=\sqrt{M^2_{P}-(2{\mathbb{M}}_c)^2}$ to determine the energy scales of the QCD spectral densities. We take into account the $SU(3)$ breaking effects of the light quarks, and obtain the masses of the hidden charm pentaquark states with the strangeness $S=0,\,-1,\,-2,\,-3$, which can be confronted with the experimental data in the future. |
2308.03849 | Shakeel Ur Rahaman | Joydeep Chakrabortty, Shakeel Ur Rahaman, and Kaanapuli Ramkumar | One-loop Effective Action up to Dimension Eight: Integrating out Heavy
Fermion(s) | 1 Table, 42 pages | null | null | null | hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | We present the universal one-loop effective action up to dimension eight
after integrating out heavy fermion(s) using the Heat-Kernel method. We have
discussed how the Dirac operator being a weak elliptic operator, the fermionic
operator still can be written in the form of a strong elliptic one such that
the Heat-Kernel coefficients can be used to compute the fermionic effective
action. This action captures the footprint of both the CP conserving as well as
violating UV interactions. As it does not rely on the specific forms of either
UV or low energy theories, can be applicable for a very generic action. Our
result encapsulates the effects of heavy fermion loops only.
| [
{
"created": "Mon, 7 Aug 2023 18:01:21 GMT",
"version": "v1"
}
] | 2023-08-09 | [
[
"Chakrabortty",
"Joydeep",
""
],
[
"Rahaman",
"Shakeel Ur",
""
],
[
"Ramkumar",
"Kaanapuli",
""
]
] | We present the universal one-loop effective action up to dimension eight after integrating out heavy fermion(s) using the Heat-Kernel method. We have discussed how the Dirac operator being a weak elliptic operator, the fermionic operator still can be written in the form of a strong elliptic one such that the Heat-Kernel coefficients can be used to compute the fermionic effective action. This action captures the footprint of both the CP conserving as well as violating UV interactions. As it does not rely on the specific forms of either UV or low energy theories, can be applicable for a very generic action. Our result encapsulates the effects of heavy fermion loops only. |
1710.09376 | Claudio Muselli | Claudio Muselli | Double Differential High Energy Resummation | 25 pages, 5 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we study a general framework to perform leading log high energy
resummation with complete dependence from the rapidity and the transverse
momentum of the studied system. As an application, high energy resummed
expression for the Higgs boson production in the effective field theory
framework will be derived. Explicit result for this process will be
cross-checked against fixed order evaluations up to NNLO. Consistency with
known high energy resummation for single differential rapidity or transverse
momentum distribution, as well as for inclusive cross section, will also be
shown.
| [
{
"created": "Wed, 25 Oct 2017 18:00:00 GMT",
"version": "v1"
}
] | 2017-10-27 | [
[
"Muselli",
"Claudio",
""
]
] | In this paper we study a general framework to perform leading log high energy resummation with complete dependence from the rapidity and the transverse momentum of the studied system. As an application, high energy resummed expression for the Higgs boson production in the effective field theory framework will be derived. Explicit result for this process will be cross-checked against fixed order evaluations up to NNLO. Consistency with known high energy resummation for single differential rapidity or transverse momentum distribution, as well as for inclusive cross section, will also be shown. |
hep-ph/9505230 | Eric Laenen | E. Laenen and S. Riemersma | Charm Production in Deep-Inelastic $e\gamma$ Scattering To
Next-To-Leading Order in QCD | 7 pages Latex, with 2 eps figs., uuencoded | Z.Phys. C75 (1997) 539-554 | null | CERN-TH/95-103, SMU HEP 95 02 | hep-ph | null | We discuss the calculation of $F_2^{\gamma}({\rm charm})$ to next-to-leading
order (NLO) in QCD, including contributions from both hadronlike and pointlike
photons. We show that the former dominates strongly below $x\simeq 0.01$, and
the latter above this value. This fact makes $F_2^{\gamma}({\rm charm})$ for $x
\geq 0.01$ calculable, whereas for $x \leq 0.01$ it serves to constrain the
small-$x$ gluon density in the photon. Both ranges in $x$ are accessible at
LEP2. Theoretical uncertainties are well under control. We present rates for
single-tag events for the process for $e^+e^- \rightarrow e^+e^- c X$ for LEP2.
Although these event rates are small, we believe a measurement of
$F_2^{\gamma}({\rm charm})$ is feasible.
| [
{
"created": "Thu, 4 May 1995 11:59:35 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Laenen",
"E.",
""
],
[
"Riemersma",
"S.",
""
]
] | We discuss the calculation of $F_2^{\gamma}({\rm charm})$ to next-to-leading order (NLO) in QCD, including contributions from both hadronlike and pointlike photons. We show that the former dominates strongly below $x\simeq 0.01$, and the latter above this value. This fact makes $F_2^{\gamma}({\rm charm})$ for $x \geq 0.01$ calculable, whereas for $x \leq 0.01$ it serves to constrain the small-$x$ gluon density in the photon. Both ranges in $x$ are accessible at LEP2. Theoretical uncertainties are well under control. We present rates for single-tag events for the process for $e^+e^- \rightarrow e^+e^- c X$ for LEP2. Although these event rates are small, we believe a measurement of $F_2^{\gamma}({\rm charm})$ is feasible. |
hep-ph/0311260 | Comelli Denis | P. Ciafaloni, D. Comelli, A. Vergine | Sudakov Electroweak effects in transversely polarized beams | 5 pages,4 figures | JHEP 0407 (2004) 039 | 10.1088/1126-6708/2004/07/039 | null | hep-ph | null | We study Standard Model electroweak radiative corrections for fully inclusive
observables with polarized fermionic beams. Our calculations are relevant in
view of the possibility for Next Generation Linear colliders of having
transversely and/or longitudinally polarized beams. The case of initial
transverse polarization is particularly interesting because of the interplay of
infrared/collinear logarithms of different origins, related both to the
nonabelian SU(2) and abelian U(1) sectors. The Standard model effects turn out
to be in the 10% range at the TeV scale, therefore particularly relevant in
order to disentangle possible New Physics effects.
| [
{
"created": "Thu, 20 Nov 2003 15:45:45 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Ciafaloni",
"P.",
""
],
[
"Comelli",
"D.",
""
],
[
"Vergine",
"A.",
""
]
] | We study Standard Model electroweak radiative corrections for fully inclusive observables with polarized fermionic beams. Our calculations are relevant in view of the possibility for Next Generation Linear colliders of having transversely and/or longitudinally polarized beams. The case of initial transverse polarization is particularly interesting because of the interplay of infrared/collinear logarithms of different origins, related both to the nonabelian SU(2) and abelian U(1) sectors. The Standard model effects turn out to be in the 10% range at the TeV scale, therefore particularly relevant in order to disentangle possible New Physics effects. |
0902.3756 | Adrian Palcu | Adrian Palcu | Electro-weak $SU(4)_L\otimes U(1)_Y$ models without exotic electric
charges | 14 pages, 2 Tables, no figures | Int.J.Mod.Phys.A24:4923-4938,2009 | 10.1142/S0217751X09046011 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | For the particular class of \textbf{$SU(4)_{L}\otimes U(1)_{Y}$} electro-weak
models without exotic electric charges, some plausible phenomenological
predictions - such as the boson mass spectrum and charges of all the fermions
involved therein - are made by using the algebraical approach of the exactly
solving method for gauge models with high symmetries. Along with the
one-parameter resulting mass scale (to be confirmed at TeV scale in LHC, LEP,
CDF and other high energy experiments) our approach predicts the exact
expressions of the charges (both electric and neutral) in the fermion sector,
while all the Standard Model phenomenology is naturally recovered.
| [
{
"created": "Sat, 21 Feb 2009 20:54:13 GMT",
"version": "v1"
}
] | 2014-11-18 | [
[
"Palcu",
"Adrian",
""
]
] | For the particular class of \textbf{$SU(4)_{L}\otimes U(1)_{Y}$} electro-weak models without exotic electric charges, some plausible phenomenological predictions - such as the boson mass spectrum and charges of all the fermions involved therein - are made by using the algebraical approach of the exactly solving method for gauge models with high symmetries. Along with the one-parameter resulting mass scale (to be confirmed at TeV scale in LHC, LEP, CDF and other high energy experiments) our approach predicts the exact expressions of the charges (both electric and neutral) in the fermion sector, while all the Standard Model phenomenology is naturally recovered. |
hep-ph/0106230 | Bachir Moussallam | B. Ananthanarayan (IIs, Bangalore), P. B\"uttiker (J\"ulich), B.
Moussallam (IPN, Orsay) | $\pi K$ sum rules and the SU(3) chiral expansion | 28 pages, 7 figures [v1: small corrections and improvements] | Eur.Phys.J.C22:133-148,2001 | 10.1007/s100520100766 | IISc-CTS-12/01, FZJ-IKP(Th)-2001-10, IPNO-DR 01-014 | hep-ph | null | A recently proposed set of sum rules, based on the pion-Kaon scattering
amplitudes and their crossing-symmetric conjugates are analysed in detail. A
key role is played by the $l=0$ $\pi\pi\to K\overline K$ amplitude which
requires an extrapolation to be performed. It is shown how this is tightly
constrained from analyticity, chiral counting and the available experimental
data, and its stability is tested. A re-evaluation of the $O(p^4)$ chiral
couplings $L_1$, $L_2$, $L_3$ is obtained, as well as a new evaluation of the
large $N_c$ suppressed coupling $L_4$.
| [
{
"created": "Thu, 21 Jun 2001 09:54:16 GMT",
"version": "v1"
},
{
"created": "Tue, 31 Jul 2001 09:58:11 GMT",
"version": "v2"
}
] | 2009-01-07 | [
[
"Ananthanarayan",
"B.",
"",
"IIs, Bangalore"
],
[
"Büttiker",
"P.",
"",
"Jülich"
],
[
"Moussallam",
"B.",
"",
"IPN, Orsay"
]
] | A recently proposed set of sum rules, based on the pion-Kaon scattering amplitudes and their crossing-symmetric conjugates are analysed in detail. A key role is played by the $l=0$ $\pi\pi\to K\overline K$ amplitude which requires an extrapolation to be performed. It is shown how this is tightly constrained from analyticity, chiral counting and the available experimental data, and its stability is tested. A re-evaluation of the $O(p^4)$ chiral couplings $L_1$, $L_2$, $L_3$ is obtained, as well as a new evaluation of the large $N_c$ suppressed coupling $L_4$. |
1711.08469 | Mikko Laine | J. Ghiglieri, M. Laine | GeV-scale hot sterile neutrino oscillations: a numerical solution | 26 pages. v2: clarifications and references added | JHEP 1802 (2018) 078 | 10.1007/JHEP02(2018)078 | CERN-TH-2018-022 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The scenario of baryogenesis through GeV-scale sterile neutrino oscillations
is governed by non-linear differential equations for the time evolution of a
sterile neutrino density matrix and Standard Model lepton and baryon
asymmetries. By employing up-to-date rate coefficients and a non-perturbatively
estimated Chern-Simons diffusion rate, we present a numerical solution of this
system, incorporating the full momentum and helicity dependences of the density
matrix. The density matrix deviates significantly from kinetic equilibrium,
with the IR modes equilibrating much faster than the UV modes. For equivalent
input parameters, our final results differ moderately (~50%) from recent
benchmarks in the literature. The possibility of producing an observable baryon
asymmetry is nevertheless confirmed. We illustrate the dependence of the baryon
asymmetry on the sterile neutrino mass splitting and on the CP-violating phase
measurable in active neutrino oscillation experiments.
| [
{
"created": "Wed, 22 Nov 2017 19:00:09 GMT",
"version": "v1"
},
{
"created": "Fri, 16 Feb 2018 08:31:10 GMT",
"version": "v2"
}
] | 2018-02-19 | [
[
"Ghiglieri",
"J.",
""
],
[
"Laine",
"M.",
""
]
] | The scenario of baryogenesis through GeV-scale sterile neutrino oscillations is governed by non-linear differential equations for the time evolution of a sterile neutrino density matrix and Standard Model lepton and baryon asymmetries. By employing up-to-date rate coefficients and a non-perturbatively estimated Chern-Simons diffusion rate, we present a numerical solution of this system, incorporating the full momentum and helicity dependences of the density matrix. The density matrix deviates significantly from kinetic equilibrium, with the IR modes equilibrating much faster than the UV modes. For equivalent input parameters, our final results differ moderately (~50%) from recent benchmarks in the literature. The possibility of producing an observable baryon asymmetry is nevertheless confirmed. We illustrate the dependence of the baryon asymmetry on the sterile neutrino mass splitting and on the CP-violating phase measurable in active neutrino oscillation experiments. |
1812.11533 | Soeren Schlichting | Y. Mehtar-Tani, S. Schlichting | Jet fragmentation in a QCD medium: Universal quark/gluon ration and Wave
turbulence | Proceedings of the Hard Probes 2018 conference, 30 Sept. - 5 Oct.
2018, Aix-les-Bains, France; 4 pages, 2 figures | null | null | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the evolution of a jet shower due to medium induced splittings
in the deep LPM regime. Due to the characteristic energy dependence of the
formation time $t_{\rm form}(\omega)= \sqrt{\omega /\hat{\bar{q}}}$, the
radiative break-up process exhibits turbulent characteristics, allowing for
analytic predictions of various inclusive properties of the medium induced
cascade in an inertial range of energies $T \ll \omega \ll E$, where $E$ is the
energy of the jet and $T$ is the temperature of the medium.
| [
{
"created": "Sun, 30 Dec 2018 13:44:55 GMT",
"version": "v1"
}
] | 2019-01-01 | [
[
"Mehtar-Tani",
"Y.",
""
],
[
"Schlichting",
"S.",
""
]
] | We calculate the evolution of a jet shower due to medium induced splittings in the deep LPM regime. Due to the characteristic energy dependence of the formation time $t_{\rm form}(\omega)= \sqrt{\omega /\hat{\bar{q}}}$, the radiative break-up process exhibits turbulent characteristics, allowing for analytic predictions of various inclusive properties of the medium induced cascade in an inertial range of energies $T \ll \omega \ll E$, where $E$ is the energy of the jet and $T$ is the temperature of the medium. |
hep-ph/0006003 | Chi-Tau Yan | Chao-Shang Huang, Chun Liu, Chi-Tau Yan (ITP, Beijing) | 1/m_Q Corrections to the Heavy-to-Light-Vector Transitions in the HQET | RevTeX, 9 pages, no figures | Phys.Rev. D62 (2000) 054019 | 10.1103/PhysRevD.62.054019 | null | hep-ph | null | Within the HQET, the heavy to light vector meson transitions are
systematically analyzed to the order of 1/m_Q. Besides the four universal
functions at the leading order, there are twenty-two independent universal form
factors at the order of 1/m_Q. Both the semileptonic decay B->\rho which is
relevant to the |V_{ub}| extraction, and the penguin induced decay B -> K^*
which is important to new physics discovering, depend on these form factors.
Phenomenological implications are discussed.
| [
{
"created": "Thu, 1 Jun 2000 07:55:16 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Huang",
"Chao-Shang",
"",
"ITP, Beijing"
],
[
"Liu",
"Chun",
"",
"ITP, Beijing"
],
[
"Yan",
"Chi-Tau",
"",
"ITP, Beijing"
]
] | Within the HQET, the heavy to light vector meson transitions are systematically analyzed to the order of 1/m_Q. Besides the four universal functions at the leading order, there are twenty-two independent universal form factors at the order of 1/m_Q. Both the semileptonic decay B->\rho which is relevant to the |V_{ub}| extraction, and the penguin induced decay B -> K^* which is important to new physics discovering, depend on these form factors. Phenomenological implications are discussed. |
0901.2941 | Wim de Boer | W. de Boer (Univ. of Karlsruhe, Germany) | Indirect Dark Matter Signals from EGRET and PAMELA compared | 10 pages, 4 figures, Contributed paper to the Eighth UCLA Symposium:
Sources and Detection of Dark Matter and Dark Energy in the Universe | null | 10.1063/1.3232175 | null | hep-ph astro-ph.CO astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Dark Matter annihilation (DMA) may yield an excess of gamma rays and
antimatter particles, like antiprotons and positrons, above the background from
cosmic ray interactions. The excess of diffuse Galactic Gamma Rays from EGRET
shows all the features expected from DMA. The new precise measurements of the
antiproton and positron fractions from PAMELA are compared with the EGRET
excess. It is shown that the charged particles are strongly dependent on the
propagation model used. The usual propagation models with isotropic propagation
models are incompatible with the recently observed convection in our Galaxy.
Convection leads to an order of magnitude uncertainty in the yield of charged
particles from DMA, since even a rather small convection will let drift the
charged particles in the halo to outer space. It is shown that such anisotropic
propagation models including convection prefer a contribution from DMA for the
antiprotons, but the rise in the positron fraction, as observed by PAMELA, is
incompatible with DMA, if compared with the EGRET excess. A rise in the
positron/electron ratio is expected, if the observed rise in the
proton/electron ratio is carefully fitted in a propagation model, although the
rise is slightly larger than expected, so additional local sources may
contribute as well within the limited accuracy of the data.
| [
{
"created": "Mon, 19 Jan 2009 21:47:38 GMT",
"version": "v1"
}
] | 2015-05-13 | [
[
"de Boer",
"W.",
"",
"Univ. of Karlsruhe, Germany"
]
] | Dark Matter annihilation (DMA) may yield an excess of gamma rays and antimatter particles, like antiprotons and positrons, above the background from cosmic ray interactions. The excess of diffuse Galactic Gamma Rays from EGRET shows all the features expected from DMA. The new precise measurements of the antiproton and positron fractions from PAMELA are compared with the EGRET excess. It is shown that the charged particles are strongly dependent on the propagation model used. The usual propagation models with isotropic propagation models are incompatible with the recently observed convection in our Galaxy. Convection leads to an order of magnitude uncertainty in the yield of charged particles from DMA, since even a rather small convection will let drift the charged particles in the halo to outer space. It is shown that such anisotropic propagation models including convection prefer a contribution from DMA for the antiprotons, but the rise in the positron fraction, as observed by PAMELA, is incompatible with DMA, if compared with the EGRET excess. A rise in the positron/electron ratio is expected, if the observed rise in the proton/electron ratio is carefully fitted in a propagation model, although the rise is slightly larger than expected, so additional local sources may contribute as well within the limited accuracy of the data. |
hep-ph/0307154 | David Atwood | David Atwood, Amarjit Soni | Measurement of gamma at B Factories Using Inclusive D Decays | Invited talk at the Workshop on the CKM Unitarity Triangle, IPPP
Durham, April 2003 (eConf C0304052). 4 pages LaTeX, 4 eps figures | ECONF C0304052:WG402,2003 | null | null | hep-ph | null | We discuss the determination of the CKM phase gamma through the decay B- ->
K- D0 and related processes. In particular, we consider the use of this methods
when the D0 subsequently decays to an inclusive state. We emphasize that strong
phase information obtained at a psi(3770) charm factory can provide additional
information which will be helpful in determining gamma.
| [
{
"created": "Thu, 10 Jul 2003 20:26:14 GMT",
"version": "v1"
}
] | 2010-11-23 | [
[
"Atwood",
"David",
""
],
[
"Soni",
"Amarjit",
""
]
] | We discuss the determination of the CKM phase gamma through the decay B- -> K- D0 and related processes. In particular, we consider the use of this methods when the D0 subsequently decays to an inclusive state. We emphasize that strong phase information obtained at a psi(3770) charm factory can provide additional information which will be helpful in determining gamma. |
hep-ph/0110278 | Robert Fleischer | Robert Fleischer (DESY Hamburg) | Extraction of gamma | 12 pages, LaTeX, 1 figure. Invited talk given at the 9th
International Symposium on Heavy Flavor Physics, Caltech, Pasadena, 10-13
September 2001. To appear in the Proceedings | AIP Conf.Proc.618:266-275,2002 | 10.1063/1.1478845 | DESY 01-162 | hep-ph | null | After a brief look at the well-known standard approaches to determine the
angle gamma of the unitarity triangle, we focus on two kinds of strategies,
employing $B\to\pi K$ modes, and U-spin-related B decays. Interesting
"puzzles", which may already be indicated by the present B-factory data, are
pointed out, and the importance of the extraction of hadronic parameters, which
are provided by these strategies as by-products, is emphasized.
| [
{
"created": "Mon, 22 Oct 2001 09:36:39 GMT",
"version": "v1"
}
] | 2010-11-23 | [
[
"Fleischer",
"Robert",
"",
"DESY Hamburg"
]
] | After a brief look at the well-known standard approaches to determine the angle gamma of the unitarity triangle, we focus on two kinds of strategies, employing $B\to\pi K$ modes, and U-spin-related B decays. Interesting "puzzles", which may already be indicated by the present B-factory data, are pointed out, and the importance of the extraction of hadronic parameters, which are provided by these strategies as by-products, is emphasized. |
1505.05872 | Jussi Virkaj\"arvi | Francesco Sannino, Jussi Virkaj\"arvi | First Order Electroweak Phase Transition from (Non)Conformal Extensions
of the Standard Model | v3: Typos corrected from Eq. 70, results unchanged. v2: Few typos
corrected and few comments added, match with the published version. 44 pages,
11 figures | Phys. Rev. D 92, 045015 (2015) | 10.1103/PhysRevD.92.045015 | CP3-Origins-2015-016 DNRF90 | hep-ph astro-ph.CO hep-lat hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyse and compare the finite-temperature electroweak phase transition
properties of classically (non)conformal extensions of the Standard Model. In
the classically conformal scenarios the breaking of the electroweak symmetry is
generated radiatively. The models feature new scalars coupled conformally to
the Higgs sector as well as new fermions. We uncover the parameter space
leading to a first order phase transition with(out) the Veltman conditions. We
also discuss dark (matter) aspects of some of the models and compare with
existing literature when appropriate. We observe that to accommodate both, a
first order electroweak phase transition, and a phenomenologically viable dark
matter candidate requires to go beyond the simplest extensions of the Standard
Model. Furthermore these extensions must all feature new degrees of freedom
that are naturally lighter than a TeV and therefore the associated models are
testable at the upcoming Large Hadron Collider run two experiments.
| [
{
"created": "Thu, 21 May 2015 11:25:54 GMT",
"version": "v1"
},
{
"created": "Thu, 27 Aug 2015 08:09:26 GMT",
"version": "v2"
},
{
"created": "Tue, 10 Mar 2020 13:37:23 GMT",
"version": "v3"
}
] | 2020-03-11 | [
[
"Sannino",
"Francesco",
""
],
[
"Virkajärvi",
"Jussi",
""
]
] | We analyse and compare the finite-temperature electroweak phase transition properties of classically (non)conformal extensions of the Standard Model. In the classically conformal scenarios the breaking of the electroweak symmetry is generated radiatively. The models feature new scalars coupled conformally to the Higgs sector as well as new fermions. We uncover the parameter space leading to a first order phase transition with(out) the Veltman conditions. We also discuss dark (matter) aspects of some of the models and compare with existing literature when appropriate. We observe that to accommodate both, a first order electroweak phase transition, and a phenomenologically viable dark matter candidate requires to go beyond the simplest extensions of the Standard Model. Furthermore these extensions must all feature new degrees of freedom that are naturally lighter than a TeV and therefore the associated models are testable at the upcoming Large Hadron Collider run two experiments. |
0910.5428 | Kresimir Kumericki | Jan O. Eeg, Kresimir Kumericki | The Isgur-Wise Function within a Modified Heavy-Light Chiral Quark Model | 20 pages, 7 PS figure, LaTeX | Phys.Rev.D81:074015,2010 | 10.1103/PhysRevD.81.074015 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the Isgur-Wise function xi(omega) within a new modified version
of a heavy-light chiral quark model. While early versions of such models gave
too small absolute value of the slope, namely xi'(1) of about -0.4 to -0.3, we
show how extended version(s) may lead to values around -1, in better agreement
with recent measurements. This is obtained by introducing a new mass parameter
in the heavy quark propagator. We also shortly comment on the consequences for
the decay modes B --> D D-bar.
| [
{
"created": "Wed, 28 Oct 2009 16:48:15 GMT",
"version": "v1"
}
] | 2010-05-12 | [
[
"Eeg",
"Jan O.",
""
],
[
"Kumericki",
"Kresimir",
""
]
] | We consider the Isgur-Wise function xi(omega) within a new modified version of a heavy-light chiral quark model. While early versions of such models gave too small absolute value of the slope, namely xi'(1) of about -0.4 to -0.3, we show how extended version(s) may lead to values around -1, in better agreement with recent measurements. This is obtained by introducing a new mass parameter in the heavy quark propagator. We also shortly comment on the consequences for the decay modes B --> D D-bar. |
hep-ph/0506122 | Kristjan Kannike | John Ellis, Andi Hektor, Mario Kadastik, Kristjan Kannike, Martti
Raidal | Running of Low-Energy Neutrino Masses, Mixing Angles and CP Violation | 14 pages, 7 figures | Phys.Lett.B631:32-41,2005 | 10.1016/j.physletb.2005.09.056 | CERN-PH-TH-2005/089 | hep-ph | null | We calculate the running of low-energy neutrino parameters from the bottom
up, parameterizing the unknown seesaw parameters in terms of the dominance
matrix $R$. We find significant running only if the $R$ matrix is non-trivial
and the light-neutrino masses are moderately degenerate. If the light-neutrino
masses are very hierarchical, the quark-lepton complementarity relation
$\theta_c + \theta_{12} = \pi/4$ is quite stable, but $\theta_{13,23}$ may run
beyond their likely future experimental errors. The running of the oscillation
phase $\delta$ is enhanced by the smallness of $\theta_{13}$, and jumps in the
mixing angles occur in cases where the light-neutrino mass eigenstates cross.
| [
{
"created": "Mon, 13 Jun 2005 15:27:06 GMT",
"version": "v1"
}
] | 2009-09-11 | [
[
"Ellis",
"John",
""
],
[
"Hektor",
"Andi",
""
],
[
"Kadastik",
"Mario",
""
],
[
"Kannike",
"Kristjan",
""
],
[
"Raidal",
"Martti",
""
]
] | We calculate the running of low-energy neutrino parameters from the bottom up, parameterizing the unknown seesaw parameters in terms of the dominance matrix $R$. We find significant running only if the $R$ matrix is non-trivial and the light-neutrino masses are moderately degenerate. If the light-neutrino masses are very hierarchical, the quark-lepton complementarity relation $\theta_c + \theta_{12} = \pi/4$ is quite stable, but $\theta_{13,23}$ may run beyond their likely future experimental errors. The running of the oscillation phase $\delta$ is enhanced by the smallness of $\theta_{13}$, and jumps in the mixing angles occur in cases where the light-neutrino mass eigenstates cross. |
hep-ph/0606155 | Michel Davier | M. Davier, M. Peskin, A. Snyder | Two-photon exchange model for production of neutral meson pairs in e+e-
annihilation | 7 pages, 2 figures, 1 table | null | null | null | hep-ph | null | A vector-dominance two-photon exchange model is proposed to explain the
recently observed production of $\rho^0\rho^0$ and $\rho^0\phi$ pairs in
$e^+e^-$ annihilation at 10.58 GeV with the BaBar detector. All the observed
features of the data --angular and decay distributions, rates-- are in
agreement with the model. Predictions are made for yet-unobserved final states.
| [
{
"created": "Tue, 13 Jun 2006 20:36:49 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Davier",
"M.",
""
],
[
"Peskin",
"M.",
""
],
[
"Snyder",
"A.",
""
]
] | A vector-dominance two-photon exchange model is proposed to explain the recently observed production of $\rho^0\rho^0$ and $\rho^0\phi$ pairs in $e^+e^-$ annihilation at 10.58 GeV with the BaBar detector. All the observed features of the data --angular and decay distributions, rates-- are in agreement with the model. Predictions are made for yet-unobserved final states. |
hep-ph/9809511 | Gerhard Buchalla | Gerhard Buchalla (CERN) | Non-perturbative Effects in $B\to X_sl^+l^-$ | Invited Talk presented at the QCD Euroconference 98, Montpellier, 2-8
July 1998, 7 pages, 1 figure | Nucl.Phys.Proc.Suppl.74:255-259,1999 | 10.1016/S0920-5632(99)00174-7 | CERN-TH/98-314 | hep-ph | null | The rare decay $B\to X_sl^+l^-$ provides excellent prospects for precision
tests of Standard Model flavour dynamics. The process can be computed in
perturbation theory with small uncertainty. However, in order to ensure a
reliable theoretical prediction, also potentially important effects from
non-perturbative QCD have to be controlled with sufficient accuracy. The
present article summarizes recent developments related to this topic.
| [
{
"created": "Wed, 23 Sep 1998 20:32:33 GMT",
"version": "v1"
}
] | 2009-10-09 | [
[
"Buchalla",
"Gerhard",
"",
"CERN"
]
] | The rare decay $B\to X_sl^+l^-$ provides excellent prospects for precision tests of Standard Model flavour dynamics. The process can be computed in perturbation theory with small uncertainty. However, in order to ensure a reliable theoretical prediction, also potentially important effects from non-perturbative QCD have to be controlled with sufficient accuracy. The present article summarizes recent developments related to this topic. |
hep-ph/0507052 | Enrico Cattaruzza | E. Cattaruzza, A. Del Fabbro and D. Treleani | Fractional momentum correlations in multiple production of W bosons and
of b-anti_b pairs in high energy pp collisions | Submitted to Phys. Rev. D | Phys.Rev.D72:034022,2005 | 10.1103/PhysRevD.72.034022 | null | hep-ph | null | Multiple parton collisions will represent a rather common feature in pp
collisions at the LHC, where regimes with very large momentum transfer may be
studied and events rare in lower energy accelerators might occur with a
significant rate. A reason of interest in large p_t regimes is that,
differently from low p_t, evolution will induce correlations in x in the
multiparton structure functions. We have estimated the cross section of
multiple production of W bosons with equal sign, where the correlations in x
induced by evolution are particularly relevant, and the cross section of
b-bar_b b-bar_b production, where the effects of evolution are much smaller.
Our result is that, in the case of multiple production of W bosons, the terms
with correlations may represent a correction of the order of 40% of the cross
sections, for pp collisions at 1 TeV c.m. energy, and a correction of the order
of 20% at 14 TeV. In the case of b-bar_b pairs the correction terms are of the
order of 10-15% at 1 TeV and of the order of 5% at 14 TeV.
| [
{
"created": "Tue, 5 Jul 2005 09:03:00 GMT",
"version": "v1"
}
] | 2011-03-23 | [
[
"Cattaruzza",
"E.",
""
],
[
"Del Fabbro",
"A.",
""
],
[
"Treleani",
"D.",
""
]
] | Multiple parton collisions will represent a rather common feature in pp collisions at the LHC, where regimes with very large momentum transfer may be studied and events rare in lower energy accelerators might occur with a significant rate. A reason of interest in large p_t regimes is that, differently from low p_t, evolution will induce correlations in x in the multiparton structure functions. We have estimated the cross section of multiple production of W bosons with equal sign, where the correlations in x induced by evolution are particularly relevant, and the cross section of b-bar_b b-bar_b production, where the effects of evolution are much smaller. Our result is that, in the case of multiple production of W bosons, the terms with correlations may represent a correction of the order of 40% of the cross sections, for pp collisions at 1 TeV c.m. energy, and a correction of the order of 20% at 14 TeV. In the case of b-bar_b pairs the correction terms are of the order of 10-15% at 1 TeV and of the order of 5% at 14 TeV. |
1402.2287 | Grant Remmen | Clifford Cheung and Grant N. Remmen | Naturalness and the Weak Gravity Conjecture | 5 pages, 1 figure. Discussion of EFT cutoffs added. Text
rearranged/shortened for publication in PRL | Phys. Rev. Lett. 113, 051601 (2014) | 10.1103/PhysRevLett.113.051601 | CALT-68-2879 | hep-ph gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The weak gravity conjecture (WGC) is an ultraviolet consistency condition
asserting that an Abelian force requires a state of charge $q$ and mass $m$
with $q>m/m_{\rm Pl}$. We generalize the WGC to product gauge groups and study
its tension with the naturalness principle for a charged scalar coupled to
gravity. Reconciling naturalness with the WGC either requires a Higgs phase or
a low cutoff at $\Lambda \sim q m_{\rm Pl}$. If neither applies, one can
construct simple models that forbid a natural electroweak scale and whose
observation would rule out the naturalness principle.
| [
{
"created": "Mon, 10 Feb 2014 21:00:21 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Jul 2014 02:06:24 GMT",
"version": "v2"
}
] | 2014-07-31 | [
[
"Cheung",
"Clifford",
""
],
[
"Remmen",
"Grant N.",
""
]
] | The weak gravity conjecture (WGC) is an ultraviolet consistency condition asserting that an Abelian force requires a state of charge $q$ and mass $m$ with $q>m/m_{\rm Pl}$. We generalize the WGC to product gauge groups and study its tension with the naturalness principle for a charged scalar coupled to gravity. Reconciling naturalness with the WGC either requires a Higgs phase or a low cutoff at $\Lambda \sim q m_{\rm Pl}$. If neither applies, one can construct simple models that forbid a natural electroweak scale and whose observation would rule out the naturalness principle. |
2405.08046 | Luiz Vale Silva | Luiz Vale Silva | 2023 update of the extraction of the CKM matrix elements | Presented at the 12th Workshop on the CKM Unitarity Triangle, 18-22
September 2023, Santiago de Compostela. arXiv admin note: text overlap with
arXiv:1812.04396 | null | null | null | hep-ph hep-ex hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I discuss the extraction of the Cabibbo-Kobayashi-Maskawa (CKM) matrix
elements under the Standard Model (SM) framework from a global fit combining
observables that satisfy the double requirement of being precisely known both
experimentally and theoretically. The analysis shown here relies on the
CKMfitter package, consisting of a frequentist approach that employs the Range
fit (Rfit) scheme to handle theoretical uncertainties.
| [
{
"created": "Mon, 13 May 2024 15:13:32 GMT",
"version": "v1"
}
] | 2024-05-15 | [
[
"Silva",
"Luiz Vale",
""
]
] | I discuss the extraction of the Cabibbo-Kobayashi-Maskawa (CKM) matrix elements under the Standard Model (SM) framework from a global fit combining observables that satisfy the double requirement of being precisely known both experimentally and theoretically. The analysis shown here relies on the CKMfitter package, consisting of a frequentist approach that employs the Range fit (Rfit) scheme to handle theoretical uncertainties. |
hep-ph/9602260 | Subir Sarkar | Subir Sarkar (Oxford) | Big Bang nucleosynthesis and physics beyond the Standard Model | 156 pages LaTeX, including 18 PostScript figures; uses ioplppt.sty,
epsf, and personal style file (incl.); Revised and updated to include, e.g.
implications of new deuterium observations in primordial clouds; 2-up
PostScript version (78 pages) available at
ftp://ftp.physics.ox.ac.uk/pub/local/users/sarkar/BBNreview.ps.gz ; to appear
in Reports on Progress in Physics | Rept.Prog.Phys.59:1493-1610,1996 | 10.1088/0034-4885/59/12/001 | OUTP-95-16P | hep-ph astro-ph nucl-th | null | The Hubble expansion of galaxies, the $2.73\dK$ blackbody radiation
background and the cosmic abundances of the light elements argue for a hot,
dense origin of the universe --- the standard Big Bang cosmology --- and enable
its evolution to be traced back fairly reliably to the nucleosynthesis era when
the temperature was of $\Or(1)$ MeV corresponding to an expansion age of
$\Or(1)$ sec. All particles, known and hypothetical, would have been created at
higher temperatures in the early universe and analyses of their possible
effects on the abundances of the synthesized elements enable many interesting
constraints to be obtained on particle properties. These arguments have
usefully complemented laboratory experiments in guiding attempts to extend
physics beyond the Standard $SU(3)_{\c}{\otimes}SU(2)_{\L}{\otimes}U(1)_{Y}$
Model, incorporating ideas such as supersymmetry, compositeness and
unification. We first present a pedagogical account of relativistic cosmology
and primordial nucleosynthesis, discussing both theoretical and observational
aspects, and then proceed to examine such constraints in detail, in particular
those pertaining to new massless particles and massive unstable particles.
Finally, in a section aimed at particle physicists, we illustrate applications
of such constraints to models of new physics.
| [
{
"created": "Thu, 8 Feb 1996 20:51:34 GMT",
"version": "v1"
},
{
"created": "Sun, 15 Sep 1996 11:34:11 GMT",
"version": "v2"
}
] | 2011-02-16 | [
[
"Sarkar",
"Subir",
"",
"Oxford"
]
] | The Hubble expansion of galaxies, the $2.73\dK$ blackbody radiation background and the cosmic abundances of the light elements argue for a hot, dense origin of the universe --- the standard Big Bang cosmology --- and enable its evolution to be traced back fairly reliably to the nucleosynthesis era when the temperature was of $\Or(1)$ MeV corresponding to an expansion age of $\Or(1)$ sec. All particles, known and hypothetical, would have been created at higher temperatures in the early universe and analyses of their possible effects on the abundances of the synthesized elements enable many interesting constraints to be obtained on particle properties. These arguments have usefully complemented laboratory experiments in guiding attempts to extend physics beyond the Standard $SU(3)_{\c}{\otimes}SU(2)_{\L}{\otimes}U(1)_{Y}$ Model, incorporating ideas such as supersymmetry, compositeness and unification. We first present a pedagogical account of relativistic cosmology and primordial nucleosynthesis, discussing both theoretical and observational aspects, and then proceed to examine such constraints in detail, in particular those pertaining to new massless particles and massive unstable particles. Finally, in a section aimed at particle physicists, we illustrate applications of such constraints to models of new physics. |
0704.0328 | Seung Woo Ham | S.W. Ham, E.J. Yoo, S.K. OH | Electroweak phase transitions in the MSSM with an extra $U(1)'$ | 17 pages, 2 tables, 3 figures | Phys.Rev.D76:075011,2007 | 10.1103/PhysRevD.76.075011 | null | hep-ph | null | We investigate the possibility of electroweak phase transition in the minimal
supersymmetric standard model (MSSM) with an extra $U(1)'$. This model has two
Higgs doublets and a singlet, in addition to a singlet exotic quark superfield.
We find that at the one-loop level this model may accommodate the electroweak
phase transitions that are strongly first-order in a reasonably large region of
the parameter space. In the parameter region where the phase transitions take
place, we observe that the lightest scalar Higgs boson has a smaller mass when
the strength of the phase transition becomes weaker. Also, the other three
heavier neutral Higgs bosons get more large masses when the strength of the
phase transition becomes weaker.
| [
{
"created": "Tue, 3 Apr 2007 07:10:04 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Ham",
"S. W.",
""
],
[
"Yoo",
"E. J.",
""
],
[
"OH",
"S. K.",
""
]
] | We investigate the possibility of electroweak phase transition in the minimal supersymmetric standard model (MSSM) with an extra $U(1)'$. This model has two Higgs doublets and a singlet, in addition to a singlet exotic quark superfield. We find that at the one-loop level this model may accommodate the electroweak phase transitions that are strongly first-order in a reasonably large region of the parameter space. In the parameter region where the phase transitions take place, we observe that the lightest scalar Higgs boson has a smaller mass when the strength of the phase transition becomes weaker. Also, the other three heavier neutral Higgs bosons get more large masses when the strength of the phase transition becomes weaker. |
hep-ph/0210193 | Tatsu Takeuchi | Will Loinaz, Naotoshi Okamura, Tatsu Takeuchi, and L. C. R.
Wijewardhana | The NuTeV Anomaly, Neutrino Mixing, and a Heavy Higgs Boson | 19 pages, REVTeX4, 8 postscript figures. Updated references. Typos
corrected | Phys.Rev. D67 (2003) 073012 | 10.1103/PhysRevD.67.073012 | VPI-IPPAP-02-11 | hep-ph | null | Recent results from the NuTeV experiment at Fermilab and the deviation of the
Z invisible width, measured at LEP/SLC, from its Standard Model (SM) prediction
suggest the suppression of neutrino-Z couplings. Such suppressions occur
naturally in models which mix the neutrinos with heavy gauge singlet states. We
postulate a universal suppression of the Z-nu-nu couplings by a factor of
(1-epsilon) and perform a fit to the Z-pole and NuTeV observables with epsilon
and the oblique correction parameters S and T. Compared to a fit with S and T
only, inclusion of epsilon leads to a dramatic improvement in the quality of
the fit. The values of S and T preferred by the fit can be obtained within the
SM by a simple increase in the Higgs boson mass. However, if the W mass is also
included in the fit, a non-zero U parameter becomes necessary which cannot be
supplied within the SM. The preferred value of epsilon suggests that the seesaw
mechanism may not be the reason why neutrinos are so light.
| [
{
"created": "Mon, 14 Oct 2002 01:48:16 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Jan 2003 20:00:13 GMT",
"version": "v2"
},
{
"created": "Thu, 20 Mar 2003 23:51:30 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Loinaz",
"Will",
""
],
[
"Okamura",
"Naotoshi",
""
],
[
"Takeuchi",
"Tatsu",
""
],
[
"Wijewardhana",
"L. C. R.",
""
]
] | Recent results from the NuTeV experiment at Fermilab and the deviation of the Z invisible width, measured at LEP/SLC, from its Standard Model (SM) prediction suggest the suppression of neutrino-Z couplings. Such suppressions occur naturally in models which mix the neutrinos with heavy gauge singlet states. We postulate a universal suppression of the Z-nu-nu couplings by a factor of (1-epsilon) and perform a fit to the Z-pole and NuTeV observables with epsilon and the oblique correction parameters S and T. Compared to a fit with S and T only, inclusion of epsilon leads to a dramatic improvement in the quality of the fit. The values of S and T preferred by the fit can be obtained within the SM by a simple increase in the Higgs boson mass. However, if the W mass is also included in the fit, a non-zero U parameter becomes necessary which cannot be supplied within the SM. The preferred value of epsilon suggests that the seesaw mechanism may not be the reason why neutrinos are so light. |
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