id stringlengths 9 14 | submitter stringlengths 1 56 ⌀ | authors stringlengths 5 7.68k | title stringlengths 3 299 | comments stringlengths 1 1.15k ⌀ | journal-ref stringlengths 9 298 ⌀ | doi stringlengths 12 97 ⌀ | report-no stringlengths 3 341 ⌀ | categories stringclasses 869 values | license stringclasses 9 values | orig_abstract stringlengths 16 2.44k | versions listlengths 1 39 | update_date stringlengths 10 10 | authors_parsed listlengths 1 565 | abstract stringlengths 13 2.44k |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
hep-ph/9310258 | Roberto Ugoccioni | R. Ugoccioni, A. Giovannini and S. Lupia | Void Analysis and Hierarchical Structure for Single Jets | 11 pages in Plain TeX, (8 figures not included, available on
request.) DFTT 41/93. [Talk presented at the Workshop ``Soft Physics and
Fluctuations'' Cracow, Poland, 4--7 May 1993.] | null | null | null | hep-ph | null | After a brief review of the theoretical basis of void scaling function
properties of hierarchical structure, we analyze the phenomenological
consequences at single jet level in Monte Carlo e+e- annihilation events. We
find an interesting alternative approach for characterizing quark and gluon
jets.
| [
{
"created": "Mon, 11 Oct 1993 08:40:41 GMT",
"version": "v1"
}
] | 2009-09-25 | [
[
"Ugoccioni",
"R.",
""
],
[
"Giovannini",
"A.",
""
],
[
"Lupia",
"S.",
""
]
] | After a brief review of the theoretical basis of void scaling function properties of hierarchical structure, we analyze the phenomenological consequences at single jet level in Monte Carlo e+e- annihilation events. We find an interesting alternative approach for characterizing quark and gluon jets. |
1902.03681 | Wim Cosyn | W. Cosyn, B. Pire | Deuteron helicity flip generalized parton distributions in a convolution
model | 4 pages, 2 figures; Proceedings of 8th International Conference on
Quarks and Nuclear Physics (QNP2018) 13-17 Nov 2018; Tsukuba, Japan | null | 10.7566/JPSCP.26.021005 | CPHT-PC003.022019 | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the general properties of generalized parton distributions with
helicity flip (transversity) for spin-1 hadrons in the leading twist case.
Using a basic light cone convolution model, we show the deuteron helicity
amplitudes containing quark helicity flip GPDs and comment on the role deuteron
angular momentum plays in these.
| [
{
"created": "Sun, 10 Feb 2019 23:01:38 GMT",
"version": "v1"
}
] | 2020-01-08 | [
[
"Cosyn",
"W.",
""
],
[
"Pire",
"B.",
""
]
] | We discuss the general properties of generalized parton distributions with helicity flip (transversity) for spin-1 hadrons in the leading twist case. Using a basic light cone convolution model, we show the deuteron helicity amplitudes containing quark helicity flip GPDs and comment on the role deuteron angular momentum plays in these. |
0805.1824 | Graciela B. Gelmini | Graciela B. Gelmini | Experimental relevance of low reheating temperature cosmologies | Talk given at the 43rd Rencontres de Moriond- Cosmology, La Thuile,
Italy, March 15 - 22, 2008. 4 pages, 3 figures, uses moriond.sty | null | null | CERN-PH-TH/2008-101 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Standard simple assumptions are usually made about the pre-Big Bang
Nucleosynthesis epoch, from which we do not have observations. Modifying these
assumptions, the predicted density of relic particles such as neutralinos and
sterile neutrinos can be very different from that in the standard case. For
example, neutralinos could have the dark matter density in (almost) any
supersymmetric model, and sterile neutrinos with mixings large enough to be
soon detected in neutrino experiments would become cosmologically acceptable.
These possibilities are important in view of what the LHC, and neutrino
experiments could soon find.
| [
{
"created": "Tue, 13 May 2008 11:15:57 GMT",
"version": "v1"
}
] | 2008-05-14 | [
[
"Gelmini",
"Graciela B.",
""
]
] | Standard simple assumptions are usually made about the pre-Big Bang Nucleosynthesis epoch, from which we do not have observations. Modifying these assumptions, the predicted density of relic particles such as neutralinos and sterile neutrinos can be very different from that in the standard case. For example, neutralinos could have the dark matter density in (almost) any supersymmetric model, and sterile neutrinos with mixings large enough to be soon detected in neutrino experiments would become cosmologically acceptable. These possibilities are important in view of what the LHC, and neutrino experiments could soon find. |
hep-ph/0405135 | Vesna Mikuta-Martinis | Mladen Martinis, and Vesna Mikuta-Martinis | Charge and Isospin Fluctuations in High Energy pp-Collisions | Latex, 5 pages, no figures. To appear in the proceedings of 9th
Adriatic Meeting, Dubrovnik, Croatia, 4 - 14 September 2003. Added reference
into reference no. 3 | SpringerProc.Phys.98:163-167,2005 | 10.1007/3-540-26798-0_15 | null | hep-ph | null | Charge and isospin event-by-event fluctuations in high-energy pp-collisions
are predicted within the Unitary Eikonal Model, in particular the fluctuation
patterns of the ratios of charged-to-charged and neutral-to-charged pions.
These fluctuations are found to be sensitive to the presence of unstable
resonances, such as $\rho $ and $\omega $ mesons. We predict that the
charge-fluctuation observable $D_{UEM}$ should be restricted to the interval
$8/3\le D_{UEM}\le 4$ depending on the $\rho /\pi $ production ratio. Also, the
isospin fluctuations of the DCC-type of the ratio of neutral-to-charged pions
are suppressed if pions are produced together with $\rho $ mesons.
| [
{
"created": "Fri, 14 May 2004 14:46:21 GMT",
"version": "v1"
},
{
"created": "Tue, 18 May 2004 16:16:59 GMT",
"version": "v2"
}
] | 2015-06-25 | [
[
"Martinis",
"Mladen",
""
],
[
"Mikuta-Martinis",
"Vesna",
""
]
] | Charge and isospin event-by-event fluctuations in high-energy pp-collisions are predicted within the Unitary Eikonal Model, in particular the fluctuation patterns of the ratios of charged-to-charged and neutral-to-charged pions. These fluctuations are found to be sensitive to the presence of unstable resonances, such as $\rho $ and $\omega $ mesons. We predict that the charge-fluctuation observable $D_{UEM}$ should be restricted to the interval $8/3\le D_{UEM}\le 4$ depending on the $\rho /\pi $ production ratio. Also, the isospin fluctuations of the DCC-type of the ratio of neutral-to-charged pions are suppressed if pions are produced together with $\rho $ mesons. |
1605.08227 | Minoru Nagai | Ryuichiro Kitano, Ryuji Motono and Minoru Nagai | MSSM without a free parameter | 23 pages, 8 figures, 1 table | Phys. Rev. D 94, 115016 (2016) | 10.1103/PhysRevD.94.115016 | KEK-TH-1904, MISC-2016-04 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is often argued that the minimal supersymmetric standard model has O(100)
free parameters and the generic parameter region is already excluded by the
null observation of the flavor and CP violating processes as well as the
constraints from the LHC experiments. This situation naturally leads us to
consider the case where all the dangerous soft supersymmetry breaking terms
such as the scalar masses and scalar couplings are absent, while only the
unified gaugino mass term and the mu term are non-vanishing at the grand
unification scale. We revisit this simple situation taking into account the
observed Higgs boson mass, 125 GeV. Since the gaugino mass and the mu term are
fixed in order to explain the Higgs boson and the Z boson masses, there is no
free parameter left in this scenario. We find that there are three independent
parameter sets exist including ones which have not been discussed in the
literature. We also find that the abundance of the dark matter can be explained
by relic gravitinos which are non-thermally produced as decay products of the
SUSY particles while satisfying constraints from Big Bang Nucleosynthesis. We
discuss the effects of the gravity mediation which generically give
contribution to the soft terms of the order of the gravitino mass. It turns out
that newly found parameter set is preferable to explain the Higgs boson mass as
well as the gravitino dark matter while satisfying the constraints from the
electric dipole moments of the electron and the nucleon.
| [
{
"created": "Thu, 26 May 2016 11:16:47 GMT",
"version": "v1"
}
] | 2016-12-21 | [
[
"Kitano",
"Ryuichiro",
""
],
[
"Motono",
"Ryuji",
""
],
[
"Nagai",
"Minoru",
""
]
] | It is often argued that the minimal supersymmetric standard model has O(100) free parameters and the generic parameter region is already excluded by the null observation of the flavor and CP violating processes as well as the constraints from the LHC experiments. This situation naturally leads us to consider the case where all the dangerous soft supersymmetry breaking terms such as the scalar masses and scalar couplings are absent, while only the unified gaugino mass term and the mu term are non-vanishing at the grand unification scale. We revisit this simple situation taking into account the observed Higgs boson mass, 125 GeV. Since the gaugino mass and the mu term are fixed in order to explain the Higgs boson and the Z boson masses, there is no free parameter left in this scenario. We find that there are three independent parameter sets exist including ones which have not been discussed in the literature. We also find that the abundance of the dark matter can be explained by relic gravitinos which are non-thermally produced as decay products of the SUSY particles while satisfying constraints from Big Bang Nucleosynthesis. We discuss the effects of the gravity mediation which generically give contribution to the soft terms of the order of the gravitino mass. It turns out that newly found parameter set is preferable to explain the Higgs boson mass as well as the gravitino dark matter while satisfying the constraints from the electric dipole moments of the electron and the nucleon. |
hep-ph/0508125 | Alan R. White | Alan. R. White | High-Energy Unitarity and the Standard Model | Contributed to the Proceedings of the Gribov-75 Memorial Workshop | null | 10.1142/9789812773784_0037 | null | hep-ph | null | High-energy unitarity is argued to select a special version of QCD as the
strong interaction. Electroweak symmetry breaking has to be due to a new sextet
quark sector - that will produce large cross-section effects at the LHC. The
sextet sector embeds, uniquely, in a massless SU(5) theory that potentially
generates the states and interactions of the Standard Model within a
bound-state S-Matrix. Infra-red chirality transitions of the massless Dirac sea
play an essential dynamical role.
| [
{
"created": "Wed, 10 Aug 2005 20:26:35 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"White",
"Alan. R.",
""
]
] | High-energy unitarity is argued to select a special version of QCD as the strong interaction. Electroweak symmetry breaking has to be due to a new sextet quark sector - that will produce large cross-section effects at the LHC. The sextet sector embeds, uniquely, in a massless SU(5) theory that potentially generates the states and interactions of the Standard Model within a bound-state S-Matrix. Infra-red chirality transitions of the massless Dirac sea play an essential dynamical role. |
2312.12507 | K{\aa}re Fridell | K\r{a}re Fridell, Mitrajyoti Ghosh, Takemichi Okui, Kohsaku Tobioka | Decoding the $B \to K \nu \nu$ excess at Belle II: kinematics,
operators, and masses | 7 pages, 6 figures, matches published version | Phys.Rev.D 109 (2024) 11, 115006 | 10.1103/PhysRevD.109.115006 | KEK-TH-2587 | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | An excess in the branching fraction for $B^+ \to K^+ \nu\nu$ recently
measured at Belle II may be a hint of new physics. We perform thorough
likelihood analyses for different new physics scenarios such as $B \to KX$ with
a new invisible particle $X$, or $B\to K\chi\chi$ through a scalar, vector, or
tensor current with $\chi$ being a new invisible particle or a neutrino. We
find that vector-current 3-body decay with $m_X \simeq 0.6$ GeV - which may be
dark matter - is most favored, while 2-body decay with $m_X \simeq 2$ GeV is
also competitive. The best-fit branching fractions for the scalar and tensor
cases are a few times larger than for the 2-body and vector cases. Past BaBar
measurements provide further discrimination, although the best-fit parameters
stay similar.
| [
{
"created": "Tue, 19 Dec 2023 19:00:02 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Jul 2024 11:20:56 GMT",
"version": "v2"
}
] | 2024-07-11 | [
[
"Fridell",
"Kåre",
""
],
[
"Ghosh",
"Mitrajyoti",
""
],
[
"Okui",
"Takemichi",
""
],
[
"Tobioka",
"Kohsaku",
""
]
] | An excess in the branching fraction for $B^+ \to K^+ \nu\nu$ recently measured at Belle II may be a hint of new physics. We perform thorough likelihood analyses for different new physics scenarios such as $B \to KX$ with a new invisible particle $X$, or $B\to K\chi\chi$ through a scalar, vector, or tensor current with $\chi$ being a new invisible particle or a neutrino. We find that vector-current 3-body decay with $m_X \simeq 0.6$ GeV - which may be dark matter - is most favored, while 2-body decay with $m_X \simeq 2$ GeV is also competitive. The best-fit branching fractions for the scalar and tensor cases are a few times larger than for the 2-body and vector cases. Past BaBar measurements provide further discrimination, although the best-fit parameters stay similar. |
0907.5566 | Giovanni Salm\`e | T. Frederico (ITA-CTA), E. Pace (Tor Vergata Unv.), B. Pasquini (Pavia
Unv.) and G. Salm\'e (INFN-Rome) | Pion Generalized Parton Distributions with covariant and Light-front
constituent quark models | 45 pages, 13 Figs. Submitted as regular article | Phys.Rev.D80:054021,2009 | 10.1103/PhysRevD.80.054021 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the model dependence of no-helicity flip generalized parton
distribution of the pion upon different approaches for the quark-hadron and
quark-photon vertexes, in the spacelike region. In order to obtain information
on contributions from both the valence and non-valence regions, we compare
results for spacelike momentum transfers obtained from i) an analytic covariant
model with a bare quark-photon vertex, ii) a Light-front approach with a
quark-photon vertex dressed through a microscopic vector-meson model and iii) a
Light-front approach based on the Relativistic Hamiltonian Dynamics. Our
comparisons lead to infer the same dynamical mechanism, the one-gluon-exchange
dominance at short distances, as a source of both the electromagnetic form
factor at large momentum transfer and the parton distribution close to the
end-points. The expected collinear behavior of the generalized parton
distributions at high momentum transfer, i.e. a maximum for $x\sim 1$, is also
illustrated, independently of the different approaches. Finally a comparison
with recent Lattice calculations of the gravitational form factors is
presented.
| [
{
"created": "Fri, 31 Jul 2009 16:13:33 GMT",
"version": "v1"
}
] | 2009-11-06 | [
[
"Frederico",
"T.",
"",
"ITA-CTA"
],
[
"Pace",
"E.",
"",
"Tor Vergata Unv."
],
[
"Pasquini",
"B.",
"",
"Pavia\n Unv."
],
[
"Salmé",
"G.",
"",
"INFN-Rome"
]
] | We investigate the model dependence of no-helicity flip generalized parton distribution of the pion upon different approaches for the quark-hadron and quark-photon vertexes, in the spacelike region. In order to obtain information on contributions from both the valence and non-valence regions, we compare results for spacelike momentum transfers obtained from i) an analytic covariant model with a bare quark-photon vertex, ii) a Light-front approach with a quark-photon vertex dressed through a microscopic vector-meson model and iii) a Light-front approach based on the Relativistic Hamiltonian Dynamics. Our comparisons lead to infer the same dynamical mechanism, the one-gluon-exchange dominance at short distances, as a source of both the electromagnetic form factor at large momentum transfer and the parton distribution close to the end-points. The expected collinear behavior of the generalized parton distributions at high momentum transfer, i.e. a maximum for $x\sim 1$, is also illustrated, independently of the different approaches. Finally a comparison with recent Lattice calculations of the gravitational form factors is presented. |
1611.06212 | Evan Johnson | Evan Johnson, Eric Braaten, Hong Zhang | Wino dark matter annihilation through the radiative formation of bound
states | 6 pages, 5 figures. Contribution to proceedings of ICHEP 2016 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The most dramatic "Sommerfeld enhancements" of neutral-wino-pair annihilation
occur when the wino mass is tuned to near critical values where there is a
zero-energy S-wave resonance at the neutral-wino-pair threshold. If the wino
mass is larger than the critical value, the resonance is a wino-pair bound
state. If the wino mass is near a critical value, low-energy winos can be
described by a zero-range effective field theory in which the winos interact
nonperturbatively through a contact interaction. The parameters of the
zero-range effective field theory can be determined by matching wino scattering
amplitudes calculated by solving the Schr\"odinger equation for a
nonrelativistic effective field theory in which the winos interact through a
potential due to the exchange of electroweak gauge bosons. The utility of the
zero-range effective field theory is illustrated by calculating the rate for
formation of an S-wave bound state in the collision of two neutral winos
through the emission of two soft photons.
| [
{
"created": "Fri, 18 Nov 2016 20:01:06 GMT",
"version": "v1"
}
] | 2016-11-21 | [
[
"Johnson",
"Evan",
""
],
[
"Braaten",
"Eric",
""
],
[
"Zhang",
"Hong",
""
]
] | The most dramatic "Sommerfeld enhancements" of neutral-wino-pair annihilation occur when the wino mass is tuned to near critical values where there is a zero-energy S-wave resonance at the neutral-wino-pair threshold. If the wino mass is larger than the critical value, the resonance is a wino-pair bound state. If the wino mass is near a critical value, low-energy winos can be described by a zero-range effective field theory in which the winos interact nonperturbatively through a contact interaction. The parameters of the zero-range effective field theory can be determined by matching wino scattering amplitudes calculated by solving the Schr\"odinger equation for a nonrelativistic effective field theory in which the winos interact through a potential due to the exchange of electroweak gauge bosons. The utility of the zero-range effective field theory is illustrated by calculating the rate for formation of an S-wave bound state in the collision of two neutral winos through the emission of two soft photons. |
hep-ph/9603319 | Yoshimasa Kurihara | M.Dubinin (Moscow State Univ.) Y.Kurihara (KEK) Y.Shimizu (KEK) | Polarization asymmetry and the Higgs boson production mechanisms | 17 pages, 6 Postscript figures, LaTeX, uses epsf.tex | Int.J.Mod.Phys.A13:4011-4022,1998 | 10.1142/S0217751X98001876 | KEK CP-042 | hep-ph | null | We calculate the cross section of Higgs boson production in the reaction e+e-
-> neutrino anti-neutrino b b-bar for the case of left and right longitudinally
polarized electron beam. Complete set of signal and irreducible background
diagrams is considered.
We propose a new critical test to identify the Higgs boson provided by the
ratio of cross sections with left and right beam polarization. This quantity is
sensitive to the ratio of Higgs-W and Higgs-Z couplings, since it exhibits the
interplay of bremsstrahlung and fusion mechanisms of Higgs boson production
inherent to the Standard Model scheme.
| [
{
"created": "Fri, 15 Mar 1996 11:19:49 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Dubinin",
"M.",
"",
"Moscow State Univ."
],
[
"Kurihara",
"Y.",
"",
"KEK"
],
[
"Shimizu",
"Y.",
"",
"KEK"
]
] | We calculate the cross section of Higgs boson production in the reaction e+e- -> neutrino anti-neutrino b b-bar for the case of left and right longitudinally polarized electron beam. Complete set of signal and irreducible background diagrams is considered. We propose a new critical test to identify the Higgs boson provided by the ratio of cross sections with left and right beam polarization. This quantity is sensitive to the ratio of Higgs-W and Higgs-Z couplings, since it exhibits the interplay of bremsstrahlung and fusion mechanisms of Higgs boson production inherent to the Standard Model scheme. |
1804.01924 | Hyun Min Lee | Hyun Min Lee | Gauged $U(1)$ Clockwork | 8 pages, no figures, Prepared for the proceedings of Corfu Summer
Institute 2017 Workshop on the Standard Model and Beyond, 2-10 September
2017, Corfu, Greece | null | null | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review the gauged $U(1)$ clockwork models as portals for new physics to
obtain effectively hierarchical couplings of the Standard Model (SM) particles
from genuine couplings of order one. Nearest-neighbor mass mixing between
multiple $U(1)$ gauge bosons lead to the localization of the zero mode gauge
boson, realizing the milicharged gauge boson in the effective theory. We
discuss some of interesting examples utilizing the gauged clockwork beyond the
SM.
| [
{
"created": "Thu, 5 Apr 2018 15:56:09 GMT",
"version": "v1"
}
] | 2018-04-06 | [
[
"Lee",
"Hyun Min",
""
]
] | We review the gauged $U(1)$ clockwork models as portals for new physics to obtain effectively hierarchical couplings of the Standard Model (SM) particles from genuine couplings of order one. Nearest-neighbor mass mixing between multiple $U(1)$ gauge bosons lead to the localization of the zero mode gauge boson, realizing the milicharged gauge boson in the effective theory. We discuss some of interesting examples utilizing the gauged clockwork beyond the SM. |
0805.3367 | Sergio Palomares-Ruiz | Sergio Palomares-Ruiz (IPPP, Durham U.) | Testing Dark Matter with Neutrino Detectors | 6 pp, 1 fig, Talk given at the 43rd Rencontres de Moriond EW 2008, La
Thuile, Italy, 1-8 March 2008, uses moriond.sty | null | null | IPPP/08/35, DCPT/08/70 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Neutrinos are the least detectable Standard Model particle. By making use of
this fact, we consider dark matter annihilations and decays in the galactic
halo and show how present and future neutrino detectors could be used to set
general limits on the dark matter annihilation cross section and on the dark
matter lifetime.
| [
{
"created": "Wed, 21 May 2008 22:58:40 GMT",
"version": "v1"
}
] | 2008-05-23 | [
[
"Palomares-Ruiz",
"Sergio",
"",
"IPPP, Durham U."
]
] | Neutrinos are the least detectable Standard Model particle. By making use of this fact, we consider dark matter annihilations and decays in the galactic halo and show how present and future neutrino detectors could be used to set general limits on the dark matter annihilation cross section and on the dark matter lifetime. |
hep-ph/0402022 | Boris Kerbikov | B.Kerbikov (ITEP) | Remark on the effective range approach to the f_0-a_0 mesons | LaTeX, 8 pages, no figures, minor corrections, to appear in
Phys.Lett.B | Phys.Lett. B596 (2004) 200-204 | 10.1016/j.physletb.2004.06.084 | null | hep-ph | null | Discussion of apparently simple issues related to the resonance close to
threshold may lead to misleading results. We clarify some subtle points, in
particular the relation between Breit-Wigner and effective range approaches to
the f_0-a_0 mesons.
| [
{
"created": "Mon, 2 Feb 2004 17:27:29 GMT",
"version": "v1"
},
{
"created": "Thu, 24 Jun 2004 15:40:07 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Kerbikov",
"B.",
"",
"ITEP"
]
] | Discussion of apparently simple issues related to the resonance close to threshold may lead to misleading results. We clarify some subtle points, in particular the relation between Breit-Wigner and effective range approaches to the f_0-a_0 mesons. |
hep-ph/9408352 | Peter Cho | Peter Cho, Sandip Trivedi and Mark Wise | Gluon fragmentation into polarized charmonium | 11 pages with 1 uuencoded figure, CALT-68-1943, FERMILAB-PUB-94/256-T | Phys.Rev.D51:2039-2043,1995 | 10.1103/PhysRevD.51.R2039 | null | hep-ph | null | Gluon fragmentation to $\chicJ(1P)$ followed by single photon emission
represents the dominant source of prompt $J/\Psi$'s at the Tevatron for
$p_\perp \gtap 6 \GeV$. Since fragmenting gluons are approximately transverse,
their products are significantly polarized. We find that gluon fragmentation
populates the helicity levels of $\chione$, $\chitwo$ and $J/\Psi$ according to
$D_{\chione^{(h=0)}}: D_{\chione^{(|h|=1)}} \simeq 1:1$, $D_{\chitwo^{(h=0)}} :
D_{\chitwo^{(|h|=1)}} : D_{\chitwo^{(|h|=2)}} \simeq 1:2.9:6.0$ and
$D_{\J^{(h=0)}} : D_{\J^{(|h|=1)}} \simeq 1:3.4$. We also speculate that gluon
fragmentation to the radially excited $\chitwo(2P)$ state followed by
subsequent radiative decay could represent a large source of $\psi'(2S)$'s and
potentially resolve the $\psi'$ deficit problem. A measurement of these states'
polarizations would test this idea.
| [
{
"created": "Tue, 23 Aug 1994 04:00:20 GMT",
"version": "v1"
}
] | 2010-01-06 | [
[
"Cho",
"Peter",
""
],
[
"Trivedi",
"Sandip",
""
],
[
"Wise",
"Mark",
""
]
] | Gluon fragmentation to $\chicJ(1P)$ followed by single photon emission represents the dominant source of prompt $J/\Psi$'s at the Tevatron for $p_\perp \gtap 6 \GeV$. Since fragmenting gluons are approximately transverse, their products are significantly polarized. We find that gluon fragmentation populates the helicity levels of $\chione$, $\chitwo$ and $J/\Psi$ according to $D_{\chione^{(h=0)}}: D_{\chione^{(|h|=1)}} \simeq 1:1$, $D_{\chitwo^{(h=0)}} : D_{\chitwo^{(|h|=1)}} : D_{\chitwo^{(|h|=2)}} \simeq 1:2.9:6.0$ and $D_{\J^{(h=0)}} : D_{\J^{(|h|=1)}} \simeq 1:3.4$. We also speculate that gluon fragmentation to the radially excited $\chitwo(2P)$ state followed by subsequent radiative decay could represent a large source of $\psi'(2S)$'s and potentially resolve the $\psi'$ deficit problem. A measurement of these states' polarizations would test this idea. |
2203.07261 | Andrea Wulzer Dr | Jorge De Blas, Dario Buttazzo, Rodolfo Capdevilla, David Curtin,
Roberto Franceschini, Fabio Maltoni, Patrick Meade, Federico Meloni, Shufang
Su, Eleni Vryonidou, Andrea Wulzer, Chiara Aim\`e, Aram Apyan, Pouya Asadi,
Mohammed Attia Mahmoud, Aleksandr Azatov, Nazar Bartosik, Alessandro
Bertolin, Salvatore Bottaro, Laura Buonincontri, Massimo Casarsa, Luca
Castelli, Maria Gabriella Catanesi, Francesco Giovanni Celiberto, Alessandro
Cerri, Cari Cesarotti, Grigorios Chachamis, Siyu Chen, Yang-Ting Chien, Mauro
Chiesa, Marco Costa, Giacomo Da Molin, Sridhara Dasu, Dmitri Denisov, Haluk
Denizli, Radovan Dermisek, Luca Di Luzio, Biagio Di Micco, Keith Dienes,
Tommaso Dorigo, Marco Fabbrichesi, Davide Fiorina, Matthew Forslund, Emidio
Gabrielli, Francesco Garosi, Alfredo Glioti, Mario Greco, Admir Greljo,
Ramona Groeber, Christophe Grojean, Jiayin Gu, Chengcheng Han, Tao Han, Keith
Hermanek, Matthew Herndon, Tova Ray Holmes, Samuel Homiller, Guoyuan Huang,
Sudip Jana, Sergo Jindariani, Yonatan Kahn, Wolfgang Kilian, Patrick
Koppenburg, Nils Kreher, Karol Krizka, Gordan Krnjaic, Nilanjana Kumar,
Lawrence Lee, Qiang Li, Zhen Liu, Kenneth Long, Ian Low, Qianshu Lu,
Donatella Lucchesi, Lianliang Ma, Yang Ma, Luca Mantani, David Marzocca,
Navin McGinnis, Barbara Mele, Claudia Merlassino, Alessandro Montella, Marco
Nardecchia, Federico Nardi, Paolo Panci, Simone Pagan Griso, Giuliano Panico,
Paride Paradisi, Nadia Pastrone, Fulvio Piccinini, Karolos Potamianos, Emilio
Radicioni, Riccardo Rattazzi, Diego Redigolo, Laura Reina, J\"urgen Reuter,
Cristina Riccardi, Lorenzo Ricci, Luciano Ristori, Tania Natalie Robens,
Werner Rodejohann, Richard Ruiz, Farinaldo S. Queiroz, Filippo Sala, Jakub
Salko, Paola Salvini, Jose Santiago, Ivano Sarra, Daniel Schulte, Michele
Selvaggi, Abdulkadir Senol, Lorenzo Sestini, Varun Sharma, Rosa Simoniello,
Giordon Holtsberg Stark, Daniel Stolarski, Wei Su, Olcyr Sumensari, Xiaohu
Sun, Tim M.P. Tait, Jian Tang, Andrea Tesi, Brooks Thomas, Emily Anne
Thompson, Riccardo Torre, Sokratis Trifinopoulos, Ilaria Vai, Alessandro
Valenti, Ludovico Vittorio, Liantao Wang, Yongcheng Wu, Keping Xie, Xiaoran
Zhao, Jose Zurita | The physics case of a 3 TeV muon collider stage | 73 pages, 28 figures; Contribution to Snowmass 2021 | null | null | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | In the path towards a muon collider with center of mass energy of 10 TeV or
more, a stage at 3 TeV emerges as an appealing option. Reviewing the physics
potential of such muon collider is the main purpose of this document. In order
to outline the progression of the physics performances across the stages, a few
sensitivity projections for higher energy are also presented. There are many
opportunities for probing new physics at a 3 TeV muon collider. Some of them
are in common with the extensively documented physics case of the CLIC 3 TeV
energy stage, and include measuring the Higgs trilinear coupling and testing
the possible composite nature of the Higgs boson and of the top quark at the 20
TeV scale. Other opportunities are unique of a 3 TeV muon collider, and stem
from the fact that muons are collided rather than electrons. This is
exemplified by studying the potential to explore the microscopic origin of the
current $g$-2 and $B$-physics anomalies, which are both related with muons.
| [
{
"created": "Mon, 14 Mar 2022 16:41:37 GMT",
"version": "v1"
},
{
"created": "Fri, 27 May 2022 13:55:53 GMT",
"version": "v2"
}
] | 2022-05-30 | [
[
"De Blas",
"Jorge",
""
],
[
"Buttazzo",
"Dario",
""
],
[
"Capdevilla",
"Rodolfo",
""
],
[
"Curtin",
"David",
""
],
[
"Franceschini",
"Roberto",
""
],
[
"Maltoni",
"Fabio",
""
],
[
"Meade",
"Patrick",
""
],
[
"Meloni",
"Federico",
""
],
[
"Su",
"Shufang",
""
],
[
"Vryonidou",
"Eleni",
""
],
[
"Wulzer",
"Andrea",
""
],
[
"Aimè",
"Chiara",
""
],
[
"Apyan",
"Aram",
""
],
[
"Asadi",
"Pouya",
""
],
[
"Mahmoud",
"Mohammed Attia",
""
],
[
"Azatov",
"Aleksandr",
""
],
[
"Bartosik",
"Nazar",
""
],
[
"Bertolin",
"Alessandro",
""
],
[
"Bottaro",
"Salvatore",
""
],
[
"Buonincontri",
"Laura",
""
],
[
"Casarsa",
"Massimo",
""
],
[
"Castelli",
"Luca",
""
],
[
"Catanesi",
"Maria Gabriella",
""
],
[
"Celiberto",
"Francesco Giovanni",
""
],
[
"Cerri",
"Alessandro",
""
],
[
"Cesarotti",
"Cari",
""
],
[
"Chachamis",
"Grigorios",
""
],
[
"Chen",
"Siyu",
""
],
[
"Chien",
"Yang-Ting",
""
],
[
"Chiesa",
"Mauro",
""
],
[
"Costa",
"Marco",
""
],
[
"Da Molin",
"Giacomo",
""
],
[
"Dasu",
"Sridhara",
""
],
[
"Denisov",
"Dmitri",
""
],
[
"Denizli",
"Haluk",
""
],
[
"Dermisek",
"Radovan",
""
],
[
"Di Luzio",
"Luca",
""
],
[
"Di Micco",
"Biagio",
""
],
[
"Dienes",
"Keith",
""
],
[
"Dorigo",
"Tommaso",
""
],
[
"Fabbrichesi",
"Marco",
""
],
[
"Fiorina",
"Davide",
""
],
[
"Forslund",
"Matthew",
""
],
[
"Gabrielli",
"Emidio",
""
],
[
"Garosi",
"Francesco",
""
],
[
"Glioti",
"Alfredo",
""
],
[
"Greco",
"Mario",
""
],
[
"Greljo",
"Admir",
""
],
[
"Groeber",
"Ramona",
""
],
[
"Grojean",
"Christophe",
""
],
[
"Gu",
"Jiayin",
""
],
[
"Han",
"Chengcheng",
""
],
[
"Han",
"Tao",
""
],
[
"Hermanek",
"Keith",
""
],
[
"Herndon",
"Matthew",
""
],
[
"Holmes",
"Tova Ray",
""
],
[
"Homiller",
"Samuel",
""
],
[
"Huang",
"Guoyuan",
""
],
[
"Jana",
"Sudip",
""
],
[
"Jindariani",
"Sergo",
""
],
[
"Kahn",
"Yonatan",
""
],
[
"Kilian",
"Wolfgang",
""
],
[
"Koppenburg",
"Patrick",
""
],
[
"Kreher",
"Nils",
""
],
[
"Krizka",
"Karol",
""
],
[
"Krnjaic",
"Gordan",
""
],
[
"Kumar",
"Nilanjana",
""
],
[
"Lee",
"Lawrence",
""
],
[
"Li",
"Qiang",
""
],
[
"Liu",
"Zhen",
""
],
[
"Long",
"Kenneth",
""
],
[
"Low",
"Ian",
""
],
[
"Lu",
"Qianshu",
""
],
[
"Lucchesi",
"Donatella",
""
],
[
"Ma",
"Lianliang",
""
],
[
"Ma",
"Yang",
""
],
[
"Mantani",
"Luca",
""
],
[
"Marzocca",
"David",
""
],
[
"McGinnis",
"Navin",
""
],
[
"Mele",
"Barbara",
""
],
[
"Merlassino",
"Claudia",
""
],
[
"Montella",
"Alessandro",
""
],
[
"Nardecchia",
"Marco",
""
],
[
"Nardi",
"Federico",
""
],
[
"Panci",
"Paolo",
""
],
[
"Griso",
"Simone Pagan",
""
],
[
"Panico",
"Giuliano",
""
],
[
"Paradisi",
"Paride",
""
],
[
"Pastrone",
"Nadia",
""
],
[
"Piccinini",
"Fulvio",
""
],
[
"Potamianos",
"Karolos",
""
],
[
"Radicioni",
"Emilio",
""
],
[
"Rattazzi",
"Riccardo",
""
],
[
"Redigolo",
"Diego",
""
],
[
"Reina",
"Laura",
""
],
[
"Reuter",
"Jürgen",
""
],
[
"Riccardi",
"Cristina",
""
],
[
"Ricci",
"Lorenzo",
""
],
[
"Ristori",
"Luciano",
""
],
[
"Robens",
"Tania Natalie",
""
],
[
"Rodejohann",
"Werner",
""
],
[
"Ruiz",
"Richard",
""
],
[
"Queiroz",
"Farinaldo S.",
""
],
[
"Sala",
"Filippo",
""
],
[
"Salko",
"Jakub",
""
],
[
"Salvini",
"Paola",
""
],
[
"Santiago",
"Jose",
""
],
[
"Sarra",
"Ivano",
""
],
[
"Schulte",
"Daniel",
""
],
[
"Selvaggi",
"Michele",
""
],
[
"Senol",
"Abdulkadir",
""
],
[
"Sestini",
"Lorenzo",
""
],
[
"Sharma",
"Varun",
""
],
[
"Simoniello",
"Rosa",
""
],
[
"Stark",
"Giordon Holtsberg",
""
],
[
"Stolarski",
"Daniel",
""
],
[
"Su",
"Wei",
""
],
[
"Sumensari",
"Olcyr",
""
],
[
"Sun",
"Xiaohu",
""
],
[
"Tait",
"Tim M. P.",
""
],
[
"Tang",
"Jian",
""
],
[
"Tesi",
"Andrea",
""
],
[
"Thomas",
"Brooks",
""
],
[
"Thompson",
"Emily Anne",
""
],
[
"Torre",
"Riccardo",
""
],
[
"Trifinopoulos",
"Sokratis",
""
],
[
"Vai",
"Ilaria",
""
],
[
"Valenti",
"Alessandro",
""
],
[
"Vittorio",
"Ludovico",
""
],
[
"Wang",
"Liantao",
""
],
[
"Wu",
"Yongcheng",
""
],
[
"Xie",
"Keping",
""
],
[
"Zhao",
"Xiaoran",
""
],
[
"Zurita",
"Jose",
""
]
] | In the path towards a muon collider with center of mass energy of 10 TeV or more, a stage at 3 TeV emerges as an appealing option. Reviewing the physics potential of such muon collider is the main purpose of this document. In order to outline the progression of the physics performances across the stages, a few sensitivity projections for higher energy are also presented. There are many opportunities for probing new physics at a 3 TeV muon collider. Some of them are in common with the extensively documented physics case of the CLIC 3 TeV energy stage, and include measuring the Higgs trilinear coupling and testing the possible composite nature of the Higgs boson and of the top quark at the 20 TeV scale. Other opportunities are unique of a 3 TeV muon collider, and stem from the fact that muons are collided rather than electrons. This is exemplified by studying the potential to explore the microscopic origin of the current $g$-2 and $B$-physics anomalies, which are both related with muons. |
2205.02420 | Kun Xu | Kun Xu, Fan Lin, Anping Huang, Mei Huang | $\Lambda/{\bar \Lambda}$ Polarization and Splitting Induced by Rotation
and Magnetic Field | 6 pages, 4 figures | null | 10.1103/PhysRevD.106.L071502 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The global polarization of $\Lambda/{\bar \Lambda}$ and the splitting of
${\bar \Lambda}-\Lambda$ polarization induced by rotation and magnetic field
has been investigated in a dynamical quark model by taking into account the
axial vector interaction and the anomalous magnetic moment of quarks. It is
found that the rotation leads to the spin polarization of quarks and
anti-quarks with the same sign, while the magnetic field to opposite sign,
which corresponds to the ${\bar \Lambda}-\Lambda$ polarization splitting. The
combination of the two effects leads to perfect agreement with experiment data.
Quantitatively, the axial vector spin polarization contributes 30$\%$ of the
global polarization and the anomalous magnetic moment of quarks contributes
40$\%$ to the splitting of ${\bar \Lambda}-\Lambda$ polarization. However, at
$\sqrt{s_{NN}} \leq 7.7 \text{GeV}$, it still remains a challenge to reach
enough magnitude of the magnetic field at freeze-out.
| [
{
"created": "Thu, 5 May 2022 03:44:16 GMT",
"version": "v1"
},
{
"created": "Mon, 9 May 2022 12:12:22 GMT",
"version": "v2"
},
{
"created": "Tue, 1 Nov 2022 01:50:35 GMT",
"version": "v3"
}
] | 2022-11-02 | [
[
"Xu",
"Kun",
""
],
[
"Lin",
"Fan",
""
],
[
"Huang",
"Anping",
""
],
[
"Huang",
"Mei",
""
]
] | The global polarization of $\Lambda/{\bar \Lambda}$ and the splitting of ${\bar \Lambda}-\Lambda$ polarization induced by rotation and magnetic field has been investigated in a dynamical quark model by taking into account the axial vector interaction and the anomalous magnetic moment of quarks. It is found that the rotation leads to the spin polarization of quarks and anti-quarks with the same sign, while the magnetic field to opposite sign, which corresponds to the ${\bar \Lambda}-\Lambda$ polarization splitting. The combination of the two effects leads to perfect agreement with experiment data. Quantitatively, the axial vector spin polarization contributes 30$\%$ of the global polarization and the anomalous magnetic moment of quarks contributes 40$\%$ to the splitting of ${\bar \Lambda}-\Lambda$ polarization. However, at $\sqrt{s_{NN}} \leq 7.7 \text{GeV}$, it still remains a challenge to reach enough magnitude of the magnetic field at freeze-out. |
hep-ph/9611311 | null | Hilmar Forkel (ECT*), Marina Nielsen (U. Sao Paolo) | Isospin Breaking and Instantons in QCD Nucleon Sum Rules | 28 pages, REVTEX file and 5 Postscript figures | Phys.Rev.D55:1471-1480,1997 | 10.1103/PhysRevD.55.1471 | ECT/95-0503, IFUSP/P-1152 | hep-ph nucl-th | null | We study isospin breaking instanton corrections to the operator product
expansion of the nucleon correlation functions. After a comparison with quark
model calculations based on the 't Hooft interaction, we examine the role of
instantons in the corresponding QCD sum rules. Instanton contributions are
found to be absent in the chirally even sum rule, but significant in the
chirally-odd one. They improve the consistency of both sum rules and favor a
value of the isovector quark condensate close to the chiral estimate.
| [
{
"created": "Tue, 12 Nov 1996 16:58:38 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Forkel",
"Hilmar",
"",
"ECT*"
],
[
"Nielsen",
"Marina",
"",
"U. Sao Paolo"
]
] | We study isospin breaking instanton corrections to the operator product expansion of the nucleon correlation functions. After a comparison with quark model calculations based on the 't Hooft interaction, we examine the role of instantons in the corresponding QCD sum rules. Instanton contributions are found to be absent in the chirally even sum rule, but significant in the chirally-odd one. They improve the consistency of both sum rules and favor a value of the isovector quark condensate close to the chiral estimate. |
1609.00528 | Basudeb Dasgupta | Basudeb Dasgupta (Tata Inst.), Alessandro Mirizzi (Bari Univ. and INFN
Bari), and Manibrata Sen (Tata Inst.) | Fast neutrino flavor conversions near the supernova core with realistic
flavor-dependent angular distributions | 18 pages, 7 figures (Improved presentation and new panel in Fig.6) | JCAP 02 (2017) 019 | 10.1088/1475-7516/2017/02/019 | TIFR/TH/16-35 | hep-ph astro-ph.HE astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has been recently pointed out that neutrino fluxes from a supernova can
show substantial flavor conversions almost immediately above the core. Using
linear stability analyses and numerical solutions of the fully nonlinear
equations of motion, we perform a detailed study of these fast conversions,
focussing on the region just above the supernova core. We carefully specify the
instabilities for evolution in space or time, andfind that neutrinos travelling
towards the core make fast conversions more generic, i.e., possible for a wider
range of flux ratios and angular asymmetries that produce a crossing between
the zenith-angle spectra of $\nu_e$ and ${\bar\nu_e}$. Using fluxes and angular
distributions predicted by supernova simulations, we find that fast conversions
can occur within tens of nanoseconds, only a few meters away from the putative
neutrinospheres. If these fast flavor conversions indeed take place, they would
have important implications for the supernova explosion mechanism and
nucleosynthesis.
| [
{
"created": "Fri, 2 Sep 2016 10:08:58 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Sep 2016 12:34:59 GMT",
"version": "v2"
}
] | 2017-02-16 | [
[
"Dasgupta",
"Basudeb",
"",
"Tata Inst."
],
[
"Mirizzi",
"Alessandro",
"",
"Bari Univ. and INFN\n Bari"
],
[
"Sen",
"Manibrata",
"",
"Tata Inst."
]
] | It has been recently pointed out that neutrino fluxes from a supernova can show substantial flavor conversions almost immediately above the core. Using linear stability analyses and numerical solutions of the fully nonlinear equations of motion, we perform a detailed study of these fast conversions, focussing on the region just above the supernova core. We carefully specify the instabilities for evolution in space or time, andfind that neutrinos travelling towards the core make fast conversions more generic, i.e., possible for a wider range of flux ratios and angular asymmetries that produce a crossing between the zenith-angle spectra of $\nu_e$ and ${\bar\nu_e}$. Using fluxes and angular distributions predicted by supernova simulations, we find that fast conversions can occur within tens of nanoseconds, only a few meters away from the putative neutrinospheres. If these fast flavor conversions indeed take place, they would have important implications for the supernova explosion mechanism and nucleosynthesis. |
2308.09933 | Kenji Nishiwaki | Kenzo Ishikawa, Osamu Jinnouchi, Kenji Nishiwaki, Kin-ya Oda | Wave-Packet Effects: A Solution for Isospin Anomalies in Vector-Meson
Decay | 50 pages, 16 figures; footnote 23 added, minor typos corrected,
accepted for publication in EPJC | The European Physical Journal C, 83, Article number: 978 (2023) | 10.1140/epjc/s10052-023-12077-7 | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | There is a long-standing anomaly in the ratio of the decay width for
$\psi(3770)\to D^0\overline{D^0}$ to that for $\psi(3770)\to D^+D^-$ at the
level of $9.5\,\sigma$. A similar anomaly exists for the ratio of
$\phi(1020)\to K_\text{L}^0K_\text{S}^0$ to $\phi(1020)\to K^+K^-$ at
$2.1\,\sigma$. In this study, we reassess the anomaly through the lens of
Gaussian wave-packet formalism. Our comprehensive calculations include the
localization of the overlap of the wave packets near the mass thresholds as
well as the composite nature of the initial-state vector mesons. The results
align within $\sim 1 \sigma$ confidence level with the Particle Data Group's
central values for a physically reasonable value of the form-factor parameter,
indicating a resolution to these anomalies. We also check the deviation of a
wave-packet resonance from the Briet-Wigner shape and find that wide ranges of
the wave-packet size are consistent with the experimental data.
| [
{
"created": "Sat, 19 Aug 2023 07:27:10 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Oct 2023 08:03:15 GMT",
"version": "v2"
}
] | 2023-11-03 | [
[
"Ishikawa",
"Kenzo",
""
],
[
"Jinnouchi",
"Osamu",
""
],
[
"Nishiwaki",
"Kenji",
""
],
[
"Oda",
"Kin-ya",
""
]
] | There is a long-standing anomaly in the ratio of the decay width for $\psi(3770)\to D^0\overline{D^0}$ to that for $\psi(3770)\to D^+D^-$ at the level of $9.5\,\sigma$. A similar anomaly exists for the ratio of $\phi(1020)\to K_\text{L}^0K_\text{S}^0$ to $\phi(1020)\to K^+K^-$ at $2.1\,\sigma$. In this study, we reassess the anomaly through the lens of Gaussian wave-packet formalism. Our comprehensive calculations include the localization of the overlap of the wave packets near the mass thresholds as well as the composite nature of the initial-state vector mesons. The results align within $\sim 1 \sigma$ confidence level with the Particle Data Group's central values for a physically reasonable value of the form-factor parameter, indicating a resolution to these anomalies. We also check the deviation of a wave-packet resonance from the Briet-Wigner shape and find that wide ranges of the wave-packet size are consistent with the experimental data. |
hep-ph/0310020 | Jonathan Rosner | Michael Gronau, Yuval Grossman, and Jonathan L. Rosner | Interpreting the time-dependent CP asymmetry in $B^0 \to \pi^0 K_S$ | 11 pages, 2 figures, to be published in Phys. Lett. B. Some equations
corrected leading to small changes in figures | Phys.Lett. B579 (2004) 331-339 | 10.1016/j.physletb.2003.11.015 | TECHNION-PH-2003-7 | hep-ph | null | Flavor SU(3) is used for studying the time-dependent CP asymmetry in $B^0 \to
\pi^0 K_S$ by relating this process to $B^0\to \pi^0\pi^0$ and $B^0 \to
K^+K^-$. We calculate correlated bounds on $S_{\pi K} - \sin 2\beta$ and
$C_{\pi K}$, with maximal magnitudes of 0.2 and 0.3, where $S_{\pi K}$ and
$C_{\pi K}$ are coefficients of $\sin\Delta mt$ and $\cos\Delta mt$ in the
asymmetry. Stronger upper limits on $B^0 \to K^+K^-$ are expected to reduce
these bounds and to imply nonzero lower limits on these observables. The
asymmetry is studied as a function of a strong phase and the weak phase
$\gamma$.
| [
{
"created": "Wed, 1 Oct 2003 17:01:56 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Oct 2003 16:29:34 GMT",
"version": "v2"
},
{
"created": "Thu, 9 Oct 2003 18:32:05 GMT",
"version": "v3"
},
{
"created": "Wed, 12 Nov 2003 22:10:36 GMT",
"version": "v4"
}
] | 2010-04-05 | [
[
"Gronau",
"Michael",
""
],
[
"Grossman",
"Yuval",
""
],
[
"Rosner",
"Jonathan L.",
""
]
] | Flavor SU(3) is used for studying the time-dependent CP asymmetry in $B^0 \to \pi^0 K_S$ by relating this process to $B^0\to \pi^0\pi^0$ and $B^0 \to K^+K^-$. We calculate correlated bounds on $S_{\pi K} - \sin 2\beta$ and $C_{\pi K}$, with maximal magnitudes of 0.2 and 0.3, where $S_{\pi K}$ and $C_{\pi K}$ are coefficients of $\sin\Delta mt$ and $\cos\Delta mt$ in the asymmetry. Stronger upper limits on $B^0 \to K^+K^-$ are expected to reduce these bounds and to imply nonzero lower limits on these observables. The asymmetry is studied as a function of a strong phase and the weak phase $\gamma$. |
0901.4122 | Ivo de Medeiros Varzielas | Ivo de Medeiros Varzielas | Quasi-degenerate neutrinos and tri-bi-maximal mixing | 7 pages, to appear in the proceedings of DISCRETE'08 | J.Phys.Conf.Ser.171:012070,2009 | 10.1088/1742-6596/171/1/012070 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Assuming high-energy tri-bi-maximal mixing we study the radiative running of
leptonic mixing angles and obtain limits on the high-energy scale from
requiring consistency with the observed mixing. We construct a model in which a
non-Abelian discrete family symmetry leads both to a quasi-degenerate neutrino
mass spectrum and to near tri-bi-maximal mixing.
| [
{
"created": "Tue, 27 Jan 2009 20:16:07 GMT",
"version": "v1"
}
] | 2010-04-15 | [
[
"Varzielas",
"Ivo de Medeiros",
""
]
] | Assuming high-energy tri-bi-maximal mixing we study the radiative running of leptonic mixing angles and obtain limits on the high-energy scale from requiring consistency with the observed mixing. We construct a model in which a non-Abelian discrete family symmetry leads both to a quasi-degenerate neutrino mass spectrum and to near tri-bi-maximal mixing. |
hep-ph/9507308 | Dan Jensen | D. M. Jensen and J. Madsen (Institute of Physics and Astronomy,
University of Aarhus, Aarhus C, Denmark) | Strangelets with finite entropy | 4 pages LaTeX with REVTeX macros. Two figures in encapsulated
PostScript included using macro package epsf.tex. (tarred, compressed,
uuencoded using `uufiles' script) | Phys.Rev.D53:4719-4733,1996 | 10.1103/PhysRevD.53.4719 | IFA 95/33, AARHUS-ASTRO-1995-20 | hep-ph nucl-th | null | Strangelets with non-zero entropy are studied within the MIT bag model.
Explicit account is taken of the constraints that strangelets must be color
neutral and have a fixed total momentum. In general, masses increase with
increasing entropy per baryon, and the constraints work so as to increase
masses further. This has an important destabilizing effect on strangelets
produced in ultrarelativistic heavy ion collisions.
| [
{
"created": "Fri, 14 Jul 1995 13:05:57 GMT",
"version": "v1"
}
] | 2009-12-30 | [
[
"Jensen",
"D. M.",
"",
"Institute of Physics and Astronomy,\n University of Aarhus, Aarhus C, Denmark"
],
[
"Madsen",
"J.",
"",
"Institute of Physics and Astronomy,\n University of Aarhus, Aarhus C, Denmark"
]
] | Strangelets with non-zero entropy are studied within the MIT bag model. Explicit account is taken of the constraints that strangelets must be color neutral and have a fixed total momentum. In general, masses increase with increasing entropy per baryon, and the constraints work so as to increase masses further. This has an important destabilizing effect on strangelets produced in ultrarelativistic heavy ion collisions. |
hep-ph/0212208 | Ji-Feng Yang | Ji-Feng Yang (ECNU, Shanghai) | Coarse graining and a new strategy for renormalization | 6 pages, no figure, revtex | null | null | null | hep-ph hep-th nucl-th quant-ph | null | We present the natural arguments for the rationality of a recently proposed
simple approach for renormalization which is based solving differential
equations. The renormalization group equation is also derived in a natural way
and recognized as a decoupling theorem of the UV modes that underlie a QFT.
This new strategy has direct implications to the scheme dependence problem.
| [
{
"created": "Mon, 16 Dec 2002 09:57:16 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Mar 2003 11:02:24 GMT",
"version": "v2"
},
{
"created": "Tue, 10 Jun 2003 12:47:43 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Yang",
"Ji-Feng",
"",
"ECNU, Shanghai"
]
] | We present the natural arguments for the rationality of a recently proposed simple approach for renormalization which is based solving differential equations. The renormalization group equation is also derived in a natural way and recognized as a decoupling theorem of the UV modes that underlie a QFT. This new strategy has direct implications to the scheme dependence problem. |
1003.3664 | Rafael Florian Lang | Rafael F. Lang and Neal Weiner | Peaked Signals from Dark Matter Velocity Structures in Direct Detection
Experiments | 23 pages, 12 figures | JCAP 1006:032,2010 | 10.1088/1475-7516/2010/06/032 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In direct dark matter detection experiments, conventional elastic scattering
of WIMPs results in exponentially falling recoil spectra. In contrast, theories
of WIMPs with excited states can lead to nuclear recoil spectra that peak at
finite recoil energies E_R. The peaks of such signals are typically fairly
broad, with Delta E_R/E_peak ~ 1. We show that in the presence of dark matter
structures with low velocity dispersion, such as streams or clumps, peaks from
up-scattering can become extremely narrow with FWHM of a few keV only. This
differs dramatically from the conventionally expected WIMP spectrum and would,
once detected, open the possibility to measure the dark matter velocity
structure with a fantastic accuracy. As an intriguing example, we confront the
observed cluster of 3 events near 42 keV from the CRESST commissioning run with
this scenario, and find a wide range of parameters capable for producing such a
peak. We compare the possible signals at other experiments, and find that such
a particle could also give rise to the signal at DAMA, although not from the
same stream. Over some range of parameters a signal would be visible at xenon
experiments. We show that such dark matter peaks are a very clear signal, and
can be easily disentangled from potential backgrounds, both terrestrial or due
to WIMP down-scattering, by an enhanced annual modulation signature in both the
amplitude of the signal and its shape.
| [
{
"created": "Thu, 18 Mar 2010 19:27:54 GMT",
"version": "v1"
}
] | 2014-11-20 | [
[
"Lang",
"Rafael F.",
""
],
[
"Weiner",
"Neal",
""
]
] | In direct dark matter detection experiments, conventional elastic scattering of WIMPs results in exponentially falling recoil spectra. In contrast, theories of WIMPs with excited states can lead to nuclear recoil spectra that peak at finite recoil energies E_R. The peaks of such signals are typically fairly broad, with Delta E_R/E_peak ~ 1. We show that in the presence of dark matter structures with low velocity dispersion, such as streams or clumps, peaks from up-scattering can become extremely narrow with FWHM of a few keV only. This differs dramatically from the conventionally expected WIMP spectrum and would, once detected, open the possibility to measure the dark matter velocity structure with a fantastic accuracy. As an intriguing example, we confront the observed cluster of 3 events near 42 keV from the CRESST commissioning run with this scenario, and find a wide range of parameters capable for producing such a peak. We compare the possible signals at other experiments, and find that such a particle could also give rise to the signal at DAMA, although not from the same stream. Over some range of parameters a signal would be visible at xenon experiments. We show that such dark matter peaks are a very clear signal, and can be easily disentangled from potential backgrounds, both terrestrial or due to WIMP down-scattering, by an enhanced annual modulation signature in both the amplitude of the signal and its shape. |
2302.09171 | Adam Freese | Adam Freese and Gerald A. Miller | Light front synchronization and rest frame densities of the proton:
Electromagnetic densities | 26 pages, 7 figures, version accepted for publication | null | 10.1103/PhysRevD.107.074036 | NT@UW-23-03 | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We clarify the physical origin and meaning of the two-dimensional
relativistic densities of the light front formalism. The densities are shown to
originate entirely from the use of light front time instead of instant form
time, which physically corresponds to using an alternative synchronization
convention. This is shown by using tilted light front coordinates, which
consist of light front time and ordinary spatial coordinates, and which are
also used to show that the obtained densities describe a system at rest rather
than at infinite momentum. These coordinates allow all four components of the
electromagnetic current density to be given clear physical meanings. We
explicate the formalism for spin-half targets, obtaining charge and current
densities of the proton and neutron using empirical form factor
parametrizations, as well as up and down quark densities and currents. Angular
modulations in the densities of transversely-polarized states are explained as
originating from redshifts and blueshifts due to quarks moving in different
longitudinal directions.
| [
{
"created": "Fri, 17 Feb 2023 22:48:08 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Jul 2023 00:07:26 GMT",
"version": "v2"
}
] | 2023-07-26 | [
[
"Freese",
"Adam",
""
],
[
"Miller",
"Gerald A.",
""
]
] | We clarify the physical origin and meaning of the two-dimensional relativistic densities of the light front formalism. The densities are shown to originate entirely from the use of light front time instead of instant form time, which physically corresponds to using an alternative synchronization convention. This is shown by using tilted light front coordinates, which consist of light front time and ordinary spatial coordinates, and which are also used to show that the obtained densities describe a system at rest rather than at infinite momentum. These coordinates allow all four components of the electromagnetic current density to be given clear physical meanings. We explicate the formalism for spin-half targets, obtaining charge and current densities of the proton and neutron using empirical form factor parametrizations, as well as up and down quark densities and currents. Angular modulations in the densities of transversely-polarized states are explained as originating from redshifts and blueshifts due to quarks moving in different longitudinal directions. |
hep-ph/9411258 | Tomohiro Matsuda | Kazuo Fujikawa | A Vector-like Extension of the Standard Model | 25p , latex, UT-687 | Prog.Theor.Phys. 92 (1994) 1149-1160 | 10.1143/ptp/92.6.1149 | null | hep-ph | null | A vector-like extension of the standard model for heavier quarks and leptons
with $SU(2)\times U(1)$ gauge symmetry and only one Higgs doublet is examined.
This scheme incorporates infinitely many fermions and avoids the appearance of
a strongly interacting sector. The model is perturbatively well controllable,
and constraints such as $b\rightarrow s\gamma$ and GIM suppression in general
are naturally satisfied if the on-set of heavier fermion mass scale is chosen
at a few TeV. In this scheme, the physical Higgs particle generally mediates
leptonic as well as quark flavor-changing processes at a rate below the present
experimental limit. Vector-like models, if suitably defined, provide a viable
and interesting scheme for physics beyond 1 TeV.
| [
{
"created": "Thu, 10 Nov 1994 09:07:56 GMT",
"version": "v1"
}
] | 2017-02-01 | [
[
"Fujikawa",
"Kazuo",
""
]
] | A vector-like extension of the standard model for heavier quarks and leptons with $SU(2)\times U(1)$ gauge symmetry and only one Higgs doublet is examined. This scheme incorporates infinitely many fermions and avoids the appearance of a strongly interacting sector. The model is perturbatively well controllable, and constraints such as $b\rightarrow s\gamma$ and GIM suppression in general are naturally satisfied if the on-set of heavier fermion mass scale is chosen at a few TeV. In this scheme, the physical Higgs particle generally mediates leptonic as well as quark flavor-changing processes at a rate below the present experimental limit. Vector-like models, if suitably defined, provide a viable and interesting scheme for physics beyond 1 TeV. |
1505.01028 | Seyed Mohsen Etesami | Seyed Mohsen Etesami and Mojtaba Mohammadi Najafabadi | Double Higgs Production with a Jet Substructure Analysis to Probe Extra
Dimensions | 21 pages, 15 figures, and 3 tables | Phys. Rev. D 92, 073013 (2015) | 10.1103/PhysRevD.92.073013 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we perform a comprehensive study to probe the effects of large
extra dimensions through double Higgs production in proton-proton collisions at
the center-of-mass energies of 14, 33, 100 TeV. We concentrate on the channel
in which both Higgs bosons decay into $b\bar{b}$ pair and take into account the
main background contributions through realistic Monte-Carlo simulations. In
order to achieve an efficient event reconstruction and a good background
rejection, jet substructure techniques are used to efficiently capture the
boosted Higgs bosons in the final state. The expected limits on the model
parameters are obtained based on the invariant mass and the angular properties
of the final state objects. Depending on the number of extra dimensions, bounds
up to 6.1, 12.5, 28.1 TeV are set on the model parameter at proton-proton
collisions with the center-of-mass energies of 14, 33, and 100 TeV,
respectively.
| [
{
"created": "Tue, 5 May 2015 14:53:07 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Oct 2015 06:57:57 GMT",
"version": "v2"
}
] | 2015-10-27 | [
[
"Etesami",
"Seyed Mohsen",
""
],
[
"Najafabadi",
"Mojtaba Mohammadi",
""
]
] | In this paper, we perform a comprehensive study to probe the effects of large extra dimensions through double Higgs production in proton-proton collisions at the center-of-mass energies of 14, 33, 100 TeV. We concentrate on the channel in which both Higgs bosons decay into $b\bar{b}$ pair and take into account the main background contributions through realistic Monte-Carlo simulations. In order to achieve an efficient event reconstruction and a good background rejection, jet substructure techniques are used to efficiently capture the boosted Higgs bosons in the final state. The expected limits on the model parameters are obtained based on the invariant mass and the angular properties of the final state objects. Depending on the number of extra dimensions, bounds up to 6.1, 12.5, 28.1 TeV are set on the model parameter at proton-proton collisions with the center-of-mass energies of 14, 33, and 100 TeV, respectively. |
2001.08990 | Jayanta Dey | Ankita Mishra, Souvik Paul, Jayanta Dey, Sarthak Satapathy, Sabyasachi
Ghosh | Role of interaction on electrical conductivity of QGP in presence of
magnetic field | Conference proceeding in 64th DAE-BRNS Symposium on Nuclear Physics,
Link- http://sympnp.org/snp2019/ | null | null | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Effect of quantum chromodynamics (QCD) interaction in quark-gluon plasma on
electrical conductivity is studied, where lattice quantum chromodynamics (LQCD)
results are mapped through quark and gluon degeneracy.
| [
{
"created": "Tue, 14 Jan 2020 10:29:10 GMT",
"version": "v1"
}
] | 2020-01-27 | [
[
"Mishra",
"Ankita",
""
],
[
"Paul",
"Souvik",
""
],
[
"Dey",
"Jayanta",
""
],
[
"Satapathy",
"Sarthak",
""
],
[
"Ghosh",
"Sabyasachi",
""
]
] | Effect of quantum chromodynamics (QCD) interaction in quark-gluon plasma on electrical conductivity is studied, where lattice quantum chromodynamics (LQCD) results are mapped through quark and gluon degeneracy. |
hep-ph/9910293 | Yukihiro kato | Y. Kato (Kinki Univ.) | Study of e^{+}e^{-} --> \tilde{\chi}^{+}_{1} \tilde{\chi}^{-}_{1} -->
\tilde{\tau}^{+}_{1}\nu_{\tau} + \tilde{\tau}^{-}_{1}\bar{\nu}_{\tau} | 5 pages, 4 figures, to appear on the Proceedings of the International
Workshop on Linear Colliders LCWS99, Sitges, Spain, April 28-May 5, 1999 | null | null | null | hep-ph | null | In Supersymmetry with large $\tan\beta$ values, the lighter stau
($\tilde{\tau}_{1}$) may be lighter than the lightest chargino
($\tilde{\chi}^{\pm}_{1}$). The decay $\tilde{\chi}^{\pm}_{1} \to
\tilde{\tau}^{\pm}_{1} \nu_{\tau}$, followed by $\tilde{\tau}^{\pm}_{1} \to
\tilde{\chi}^{0}_{1} \tau$, alters a phenomenology of the chargino production.
We study the chargino pair production at future $e^{+}e^{-}$ linear colliders.
| [
{
"created": "Mon, 11 Oct 1999 07:18:40 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kato",
"Y.",
"",
"Kinki Univ."
]
] | In Supersymmetry with large $\tan\beta$ values, the lighter stau ($\tilde{\tau}_{1}$) may be lighter than the lightest chargino ($\tilde{\chi}^{\pm}_{1}$). The decay $\tilde{\chi}^{\pm}_{1} \to \tilde{\tau}^{\pm}_{1} \nu_{\tau}$, followed by $\tilde{\tau}^{\pm}_{1} \to \tilde{\chi}^{0}_{1} \tau$, alters a phenomenology of the chargino production. We study the chargino pair production at future $e^{+}e^{-}$ linear colliders. |
hep-ph/0603011 | Lars Sonnenschein | Lars Sonnenschein | Analytical solution of ttbar dilepton equations | 8 pages, 4 figures. Added neutrino masses to system of equations.
This can be exploited in search for new physics with the same decay topology
including invisible massive particles | Phys.Rev.D73:054015,2006; Erratum-ibid.D78:079902,2008 | 10.1103/PhysRevD.73.054015 10.1103/PhysRevD.78.079902 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The top quark antiquark production system in the dilepton decay channel is
described by a set of equations which is nonlinear in the unknown neutrino
momenta. Its most precise and least time consuming solution is of major
importance for measurements of top quark properties like the top quark mass and
$t\bar{t}$ spin correlations. The initial system of equations can be
transformed into two polynomial equations with two unknowns by means of
elementary algebraic operations. These two polynomials of multidegree two can
be reduced to one univariate polynomial of degree four by means of resultants.
The obtained quartic equation is solved analytically.
| [
{
"created": "Wed, 1 Mar 2006 22:44:05 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Oct 2008 08:34:04 GMT",
"version": "v2"
},
{
"created": "Sat, 18 Jun 2011 12:05:02 GMT",
"version": "v3"
}
] | 2011-06-21 | [
[
"Sonnenschein",
"Lars",
""
]
] | The top quark antiquark production system in the dilepton decay channel is described by a set of equations which is nonlinear in the unknown neutrino momenta. Its most precise and least time consuming solution is of major importance for measurements of top quark properties like the top quark mass and $t\bar{t}$ spin correlations. The initial system of equations can be transformed into two polynomial equations with two unknowns by means of elementary algebraic operations. These two polynomials of multidegree two can be reduced to one univariate polynomial of degree four by means of resultants. The obtained quartic equation is solved analytically. |
hep-ph/0512204 | Giacomo Polesello | M.M. Nojiri, G. Polesello, D.R. Tovey | Constraining Dark Matter in the MSSM at the LHC | 21 pages, 12 figures | JHEP 0603 (2006) 063 | 10.1088/1126-6708/2006/03/063 | YITP-05-76 | hep-ph | null | In the event that R-Parity conserving supersymmetry (SUSY) is discovered at
the LHC, a key issue which will need to be addressed will be the consistency of
that signal with astrophysical and non-accelerator constraints on SUSY Dark
Matter. This issue is studied for the SPA benchmark model based on measurements
of end-points and thresholds in the invariant mass spectra of various
combinations of leptons and jets. These measurements are used to constrain the
soft SUSY breaking parameters at the electroweak scale in a general MSSM model.
Based on these constraints, we assess the accuracy with which the Dark Matter
relic density can be measured.
| [
{
"created": "Thu, 15 Dec 2005 17:01:59 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Nojiri",
"M. M.",
""
],
[
"Polesello",
"G.",
""
],
[
"Tovey",
"D. R.",
""
]
] | In the event that R-Parity conserving supersymmetry (SUSY) is discovered at the LHC, a key issue which will need to be addressed will be the consistency of that signal with astrophysical and non-accelerator constraints on SUSY Dark Matter. This issue is studied for the SPA benchmark model based on measurements of end-points and thresholds in the invariant mass spectra of various combinations of leptons and jets. These measurements are used to constrain the soft SUSY breaking parameters at the electroweak scale in a general MSSM model. Based on these constraints, we assess the accuracy with which the Dark Matter relic density can be measured. |
2303.08104 | Stefan H\"oche | Joshua Isaacson, Stefan H\"oche, Frank Siegert, Sherry Wang | Tau Polarization and Correlated Decays in Neutrino Experiments | 13 pages, 12 figures, 1 table | null | null | FERMILAB-PUB-23-106-T, MCNET-23-04 | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We present the first fully differential predictions for tau neutrino
scattering in the energy region relevant to the DUNE experiment, including all
spin correlations and all tau lepton decay channels. The calculation is
performed using a generic interface between the neutrino event generator
Achilles and the publicly available, general-purpose collider event simulation
framework Sherpa.
| [
{
"created": "Tue, 14 Mar 2023 17:42:06 GMT",
"version": "v1"
}
] | 2023-03-15 | [
[
"Isaacson",
"Joshua",
""
],
[
"Höche",
"Stefan",
""
],
[
"Siegert",
"Frank",
""
],
[
"Wang",
"Sherry",
""
]
] | We present the first fully differential predictions for tau neutrino scattering in the energy region relevant to the DUNE experiment, including all spin correlations and all tau lepton decay channels. The calculation is performed using a generic interface between the neutrino event generator Achilles and the publicly available, general-purpose collider event simulation framework Sherpa. |
hep-ph/9609375 | null | MiniMax Collaboration | Analysis of Charged-Particle/Photon Observables in Hadronic
Multiparticle Production | Latex, 35 pages, no figures. Submitted to Physical Review D.
PostScript file at http://fnmine.fnal.gov:80/ | Phys.Rev.D55:5667-5680,1997 | 10.1103/PhysRevD.55.5667 | null | hep-ph | null | In order to analyze data on joint charged-particle/photon distributions from
an experimental search (T-864, MiniMax) for disoriented chiral condensate (DCC)
at the Fermilab Tevatron collider, we have identified robust observables,
ratios of normalized bivariate factorial moments, with many desirable
properties. These include insensitivity to many efficiency corrections and the
details of the modeling of the primary pion production, and sensitivity to the
production of DCC, as opposed to the generic, binomial-distribution partition
of pions into charged and neutral species. The relevant formalism is developed
and tested in Monte-Carlo simulations of the MiniMax experimental conditions.
| [
{
"created": "Mon, 16 Sep 1996 19:15:20 GMT",
"version": "v1"
}
] | 2012-08-27 | [
[
"MiniMax Collaboration",
"",
""
]
] | In order to analyze data on joint charged-particle/photon distributions from an experimental search (T-864, MiniMax) for disoriented chiral condensate (DCC) at the Fermilab Tevatron collider, we have identified robust observables, ratios of normalized bivariate factorial moments, with many desirable properties. These include insensitivity to many efficiency corrections and the details of the modeling of the primary pion production, and sensitivity to the production of DCC, as opposed to the generic, binomial-distribution partition of pions into charged and neutral species. The relevant formalism is developed and tested in Monte-Carlo simulations of the MiniMax experimental conditions. |
1712.04514 | Claudia Frugiuele | Avital Dery, Claudia Frugiuele and Yosef Nir | Large Higgs-electron Yukawa coupling in 2HDM | 14 pages, 2 figures | null | 10.1007/JHEP04(2018)044 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The present upper bound on $\kappa_e$, the ratio between the electron Yukawa
coupling and its Standard Model value, is of ${\cal O}(600)$. We ask what would
be the implications in case that $\kappa_e$ is close to this upper bound. The
simplest extension that allows for such enhancement is that of two Higgs
doublet models (2HDM) without natural flavor conservation. In this framework,
we find the following consequences: (i) Under certain conditions, measuring
$\kappa_e$ and $\kappa_V$ would be enough to predict values of Yukawa couplings
for other fermions and for the $H$ and $A$ scalars. (ii) In the case that the
scalar potential has a softly broken $Z_2$ symmetry, the second Higgs doublet
must be light, but if there is hard breaking of the symmetry, the second Higgs
doublet can be much heavier than the electroweak scale and still allow the
electron Yukawa coupling to be very different from its SM value. (iii) CP must
not be violated at a level higher than ${\cal O}(0.01/\kappa_e)$ in both the
scalar potential and the Yukawa sector. (iv) LHC searches for $e^+e^-$
resonances constrain this scenario in a significant way. Finally, we study the
implications for models where one of the scalar doublets couples only to the
first generation, or only to the third generation.
| [
{
"created": "Tue, 12 Dec 2017 20:58:20 GMT",
"version": "v1"
}
] | 2018-05-09 | [
[
"Dery",
"Avital",
""
],
[
"Frugiuele",
"Claudia",
""
],
[
"Nir",
"Yosef",
""
]
] | The present upper bound on $\kappa_e$, the ratio between the electron Yukawa coupling and its Standard Model value, is of ${\cal O}(600)$. We ask what would be the implications in case that $\kappa_e$ is close to this upper bound. The simplest extension that allows for such enhancement is that of two Higgs doublet models (2HDM) without natural flavor conservation. In this framework, we find the following consequences: (i) Under certain conditions, measuring $\kappa_e$ and $\kappa_V$ would be enough to predict values of Yukawa couplings for other fermions and for the $H$ and $A$ scalars. (ii) In the case that the scalar potential has a softly broken $Z_2$ symmetry, the second Higgs doublet must be light, but if there is hard breaking of the symmetry, the second Higgs doublet can be much heavier than the electroweak scale and still allow the electron Yukawa coupling to be very different from its SM value. (iii) CP must not be violated at a level higher than ${\cal O}(0.01/\kappa_e)$ in both the scalar potential and the Yukawa sector. (iv) LHC searches for $e^+e^-$ resonances constrain this scenario in a significant way. Finally, we study the implications for models where one of the scalar doublets couples only to the first generation, or only to the third generation. |
1012.1544 | Tzvetalina Stavreva | T. Stavreva | Direct Photon and Heavy Quark Jet Production at the LHC | Proceedings for ICHEP 2010 | PoS ICHEP2010:360,2010 | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The associated production of direct photons and heavy quarks at the LHC is
presented. Predictions for the nuclear modification factor to the cross-section
at ALICE are shown. It is demonstrated that this process is a great probe of
the gluon and heavy quark nuclear PDFs, as over 80 % of its nPDF dependence at
NLO comes from those nPDFs. Therefore measurements of this process will provide
an excellent constraint on the gluon nPDF, and will distinguish between
different nPDF sets currently out on the market.
| [
{
"created": "Tue, 7 Dec 2010 16:29:52 GMT",
"version": "v1"
}
] | 2015-03-17 | [
[
"Stavreva",
"T.",
""
]
] | The associated production of direct photons and heavy quarks at the LHC is presented. Predictions for the nuclear modification factor to the cross-section at ALICE are shown. It is demonstrated that this process is a great probe of the gluon and heavy quark nuclear PDFs, as over 80 % of its nPDF dependence at NLO comes from those nPDFs. Therefore measurements of this process will provide an excellent constraint on the gluon nPDF, and will distinguish between different nPDF sets currently out on the market. |
1806.07177 | Pieter Taels | Edmond Iancu, Pieter Taels, and Bin Wu | Jet quenching parameter in an expanding QCD plasma | null | Phys.Lett. B786 (2018) 288-295 | 10.1016/j.physletb.2018.10.007 | CERN-TH-2018-141 | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the phenomenon of transverse momentum broadening for a high-$p_T$
parton propagating through a weakly-coupled quark-gluon plasma undergoing
boost-invariant longitudinal expansion. We propose a boost-invariant
description for this phenomenon, in which the broadening refers to the angular
variables $\eta$ (the pseudo-rapidity) and $\phi$ (the azimuthal angle). The
jet quenching parameter $\hat{q}$ which enters this description depends upon
the proper time alone. We furthermore consider radiative corrections to $\hat
q$. As in the case of a static medium, we find potentially large corrections
enhanced by a double logarithm. But unlike for the static medium, these
corrections are now local in time: they depend upon the local (proper) time
characterizing the expansion, and not upon the overall path length. We resum
such corrections to all orders into a renormalized jet quenching parameter. The
main effect of this resummation is to slow down the decrease of $\hat q$ with
increasing proper time.
| [
{
"created": "Tue, 19 Jun 2018 12:20:33 GMT",
"version": "v1"
}
] | 2018-10-23 | [
[
"Iancu",
"Edmond",
""
],
[
"Taels",
"Pieter",
""
],
[
"Wu",
"Bin",
""
]
] | We study the phenomenon of transverse momentum broadening for a high-$p_T$ parton propagating through a weakly-coupled quark-gluon plasma undergoing boost-invariant longitudinal expansion. We propose a boost-invariant description for this phenomenon, in which the broadening refers to the angular variables $\eta$ (the pseudo-rapidity) and $\phi$ (the azimuthal angle). The jet quenching parameter $\hat{q}$ which enters this description depends upon the proper time alone. We furthermore consider radiative corrections to $\hat q$. As in the case of a static medium, we find potentially large corrections enhanced by a double logarithm. But unlike for the static medium, these corrections are now local in time: they depend upon the local (proper) time characterizing the expansion, and not upon the overall path length. We resum such corrections to all orders into a renormalized jet quenching parameter. The main effect of this resummation is to slow down the decrease of $\hat q$ with increasing proper time. |
2407.20680 | Wei-Xi Kong | Wei-Xi Kong and Ben-Wei Zhang | The Fox-Wolfram Moment of jet production in relativistic heavy ion
collisions | 10 pages, 7 figures | null | null | null | hep-ph nucl-th | http://creativecommons.org/licenses/by/4.0/ | We present the first theoretical investigation of Fox-Wolfram moments (FWMs)
for multi-jet production in relativistic heavy ion collisions. In this work,
jet productions in p+p collisions are computed with a Monte Carlo event
generator SHERPA, while the Linear Boltzmann Transport model is utilized to
simulate the multiple scattering of energetic partons in the hot and dense QCD
matter. The event-normalized distributions of the lower-order FWM, $H_1^T$ in
p+p and Pb+Pb collisions are calculated. It is found that for events with jet
number $n_\text{jet} = 2$ the $H_1^T$ distribution in Pb+Pb is suppressed at
small $H_1^T$ while enhanced at large $H_1^T$ region as compared to p+p. For
events with $n_\text{jet}>2$, the jet number reduction effect due to jet
quenching in the QGP decreases the $H_1^T$ distribution at large $H_1^T$ in
Pb+Pb relative to p+p. The medium modification of the Fox-Wolfram moment
$H_1^T$ for events with $n_\text{jet}\ge 2$ are also presented, which resemble
those of events with $n_\text{jet} = 2$. Its reason is revealed through the
relative contribution fractions of events with different final-state jet
numbers to $H_1^T$.
| [
{
"created": "Tue, 30 Jul 2024 09:21:53 GMT",
"version": "v1"
}
] | 2024-08-01 | [
[
"Kong",
"Wei-Xi",
""
],
[
"Zhang",
"Ben-Wei",
""
]
] | We present the first theoretical investigation of Fox-Wolfram moments (FWMs) for multi-jet production in relativistic heavy ion collisions. In this work, jet productions in p+p collisions are computed with a Monte Carlo event generator SHERPA, while the Linear Boltzmann Transport model is utilized to simulate the multiple scattering of energetic partons in the hot and dense QCD matter. The event-normalized distributions of the lower-order FWM, $H_1^T$ in p+p and Pb+Pb collisions are calculated. It is found that for events with jet number $n_\text{jet} = 2$ the $H_1^T$ distribution in Pb+Pb is suppressed at small $H_1^T$ while enhanced at large $H_1^T$ region as compared to p+p. For events with $n_\text{jet}>2$, the jet number reduction effect due to jet quenching in the QGP decreases the $H_1^T$ distribution at large $H_1^T$ in Pb+Pb relative to p+p. The medium modification of the Fox-Wolfram moment $H_1^T$ for events with $n_\text{jet}\ge 2$ are also presented, which resemble those of events with $n_\text{jet} = 2$. Its reason is revealed through the relative contribution fractions of events with different final-state jet numbers to $H_1^T$. |
hep-ph/9807375 | Andre Likhoded | S.S. Gershtein, V.V. Kiselev, A.K. Likhoded and A.I. Onishchenko | Spectroscopy of doubly charmed baryons: $\Xi_{cc}^{+}$ and
$\Xi_{cc}^{++}$ | 10 pages, Latex file, 1 fig, corrected some typos | Mod.Phys.Lett.A14:135-146,1999 | 10.1142/S0217732399000171 | DESY 98-080 | hep-ph | null | Using the quark-diquark approximation in the framework of Buchm\" uller-Tye
potential model, we investigate the spectroscopy of doubly charmed baryons:
$\Xi_{cc}^{++}$ and $\Xi_{cc}^{+}$. Our results include the masses, parameters
of radial wave functions of states with the different excitations of both
diquark and light quark-diquark system. We calculate the values of fine and
hyperfine splittings of these levels and discuss some new features, connected
to the identity of heavy quarks, in the dynamics of hadronic and radiative
transitions between the states of these baryons.
| [
{
"created": "Tue, 14 Jul 1998 20:36:07 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Jan 1999 21:08:56 GMT",
"version": "v2"
}
] | 2009-04-28 | [
[
"Gershtein",
"S. S.",
""
],
[
"Kiselev",
"V. V.",
""
],
[
"Likhoded",
"A. K.",
""
],
[
"Onishchenko",
"A. I.",
""
]
] | Using the quark-diquark approximation in the framework of Buchm\" uller-Tye potential model, we investigate the spectroscopy of doubly charmed baryons: $\Xi_{cc}^{++}$ and $\Xi_{cc}^{+}$. Our results include the masses, parameters of radial wave functions of states with the different excitations of both diquark and light quark-diquark system. We calculate the values of fine and hyperfine splittings of these levels and discuss some new features, connected to the identity of heavy quarks, in the dynamics of hadronic and radiative transitions between the states of these baryons. |
0811.4301 | Francesco Caporale | F. Caporale, D.Yu. Ivanov and A. Papa | NLO BFKL in gamma* gamma* collisions | Contribution to the proceedings of "Diffraction 2008", La
Londe-les-Maures (France), 9-14 Sep. 2008; 4 pages, latex, aicproc format | null | 10.1063/1.3122203 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study in the BFKL approach the total hadronic cross section for the
collision of two virtual photons for energies in the range of LEP2 and of
future linear colliders. The BFKL resummation is done at the next-to-leading
order in the BFKL Green's function; photon impact factors are taken instead at
the leading order, but with the inclusion of the subleading terms required by
invariance under changes of the renormalization scale and of the BFKL scale
$s_0$. We compare our results with previous estimations based on a similar kind
of approximation.
| [
{
"created": "Wed, 26 Nov 2008 14:22:06 GMT",
"version": "v1"
}
] | 2009-11-13 | [
[
"Caporale",
"F.",
""
],
[
"Ivanov",
"D. Yu.",
""
],
[
"Papa",
"A.",
""
]
] | We study in the BFKL approach the total hadronic cross section for the collision of two virtual photons for energies in the range of LEP2 and of future linear colliders. The BFKL resummation is done at the next-to-leading order in the BFKL Green's function; photon impact factors are taken instead at the leading order, but with the inclusion of the subleading terms required by invariance under changes of the renormalization scale and of the BFKL scale $s_0$. We compare our results with previous estimations based on a similar kind of approximation. |
1812.06217 | Ligong Bian | Ruiyu Zhou, Wei Cheng, Xin Deng, Ligong Bian, and Yongcheng Wu | Electroweak phase transition and Higgs phenomenology in the
Georgi-Machacek model | 28 pages, 12 figures, comments welcome | null | 10.1007/JHEP01(2019)216 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we perform the electroweak phase transition study with the
Georgi-Machacek model. We investigate both the one-step and two-step strong
first order electroweak phase transition (SFOEWPT). The SFOEWPT viable
parameter spaces could be tested by the future 14 TeV LHC, HL-LHC, and ILC. The
LHC Higgs signal strength measurements severely bound the SFOEWPT valid
parameter spaces, a tinny region of the mixing angle between the neutral fields
of the isospin-doublet and isospin-triplet scalars around $\alpha\sim 0$ can
allow the two-step SFOEWPT to occur. The triplet vacuum expectation value (VEV)
is crucial for both SFOEWPT and related Higgs phenomenology. The two-step
SFOEWPT can be distinguished from the one-step SFOEWPT through the triple Higgs
coupling searches and the low mass doubly charged Higgs searches at colliders.
| [
{
"created": "Sat, 15 Dec 2018 01:28:59 GMT",
"version": "v1"
}
] | 2019-02-20 | [
[
"Zhou",
"Ruiyu",
""
],
[
"Cheng",
"Wei",
""
],
[
"Deng",
"Xin",
""
],
[
"Bian",
"Ligong",
""
],
[
"Wu",
"Yongcheng",
""
]
] | In this work, we perform the electroweak phase transition study with the Georgi-Machacek model. We investigate both the one-step and two-step strong first order electroweak phase transition (SFOEWPT). The SFOEWPT viable parameter spaces could be tested by the future 14 TeV LHC, HL-LHC, and ILC. The LHC Higgs signal strength measurements severely bound the SFOEWPT valid parameter spaces, a tinny region of the mixing angle between the neutral fields of the isospin-doublet and isospin-triplet scalars around $\alpha\sim 0$ can allow the two-step SFOEWPT to occur. The triplet vacuum expectation value (VEV) is crucial for both SFOEWPT and related Higgs phenomenology. The two-step SFOEWPT can be distinguished from the one-step SFOEWPT through the triple Higgs coupling searches and the low mass doubly charged Higgs searches at colliders. |
2210.16035 | Masataka Mishima | Masahiro Ibe, Masataka Mishima, Yuhei Nakayama, Satoshi Shirai | Precise Estimate of Charged Wino Decay Rate | 52 pages, 18 figures; published version | null | 10.1007/JHEP01(2023)017 | IPMU22-0054 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Wino is an $\mathrm{SU}(2)_{L}$ triplet Majorana fermion and a
well-motivated dark matter candidate. The mass difference between the charged
and the neutral Winos is small thanks to the $\mathrm{SU}(2)_{L}$ symmetry. The
small mass difference makes the charged Wino meta-stable, which provides
disappearing charged track signatures at collider experiments. The constraint
on the Wino dark matter at the LHC strongly depends on the Wino lifetime. We
compute the next-to-leading order (NLO) correction of the charged Wino decay
and make the most precise estimate of the decay rate. We find that the NLO
decay rate is determined by the mass difference and scarcely depend on the Wino
mass itself in the heavy Wino limit. As a result, we find the NLO correction
gives a minor impact on the lifetime of 2-4% increase.
| [
{
"created": "Fri, 28 Oct 2022 10:16:15 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Jan 2023 04:49:20 GMT",
"version": "v2"
}
] | 2023-01-25 | [
[
"Ibe",
"Masahiro",
""
],
[
"Mishima",
"Masataka",
""
],
[
"Nakayama",
"Yuhei",
""
],
[
"Shirai",
"Satoshi",
""
]
] | The Wino is an $\mathrm{SU}(2)_{L}$ triplet Majorana fermion and a well-motivated dark matter candidate. The mass difference between the charged and the neutral Winos is small thanks to the $\mathrm{SU}(2)_{L}$ symmetry. The small mass difference makes the charged Wino meta-stable, which provides disappearing charged track signatures at collider experiments. The constraint on the Wino dark matter at the LHC strongly depends on the Wino lifetime. We compute the next-to-leading order (NLO) correction of the charged Wino decay and make the most precise estimate of the decay rate. We find that the NLO decay rate is determined by the mass difference and scarcely depend on the Wino mass itself in the heavy Wino limit. As a result, we find the NLO correction gives a minor impact on the lifetime of 2-4% increase. |
hep-ph/0508046 | Guy Raz | Guy Engelhard, Guy Raz | Using SU(3) Relations to bound the CP Asymmetries in $B \to KKK$ decays | 14 pages, revtex4 | Phys.Rev. D72 (2005) 114017 | 10.1103/PhysRevD.72.114017 | null | hep-ph | null | We consider three body $\Delta s = 1$ $B \to f$ decays with $f=KKK$. The
deviations of $-\eta_f S_f$ from $S_{\psi K_S}$ and of $C_f$ from zero can be
bounded using the approximate SU(3) flavor symmetry of the strong interactions
and branching ratios of various $\Delta s = 0$ modes. We present the most
promising SU(3) amplitude relations that can be used to obtain these bounds.
| [
{
"created": "Wed, 3 Aug 2005 13:49:24 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Engelhard",
"Guy",
""
],
[
"Raz",
"Guy",
""
]
] | We consider three body $\Delta s = 1$ $B \to f$ decays with $f=KKK$. The deviations of $-\eta_f S_f$ from $S_{\psi K_S}$ and of $C_f$ from zero can be bounded using the approximate SU(3) flavor symmetry of the strong interactions and branching ratios of various $\Delta s = 0$ modes. We present the most promising SU(3) amplitude relations that can be used to obtain these bounds. |
1003.0408 | Naoki Yamamoto | Hiroaki Abuki, Gordon Baym, Tetsuo Hatsuda, Naoki Yamamoto | The NJL model of dense three-flavor matter with axial anomaly: the low
temperature critical point and BEC-BCS diquark crossover | 9 pages, 9 figures | Phys.Rev.D81:125010,2010 | 10.1103/PhysRevD.81.125010 | TKYNT-10-02 | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the QCD phase structure in the three-flavor Nambu-Jona-Lasinio
model, incorporating the interplay between the chiral and diquark condensates
induced by the axial anomaly. We demonstrate that for an appropriate range of
parameters of the model, the interplay leads to the low temperature critical
point in the phase structure predicted by a previous Ginzburg-Landau analysis.
We also show that a Bose-Einstein condensate (BEC) of diquark molecules emerges
in the intermediate density region, and as a result, a BEC-BCS crossover is
realized with increasing quark chemical potential.
| [
{
"created": "Mon, 1 Mar 2010 18:31:58 GMT",
"version": "v1"
}
] | 2014-11-20 | [
[
"Abuki",
"Hiroaki",
""
],
[
"Baym",
"Gordon",
""
],
[
"Hatsuda",
"Tetsuo",
""
],
[
"Yamamoto",
"Naoki",
""
]
] | We study the QCD phase structure in the three-flavor Nambu-Jona-Lasinio model, incorporating the interplay between the chiral and diquark condensates induced by the axial anomaly. We demonstrate that for an appropriate range of parameters of the model, the interplay leads to the low temperature critical point in the phase structure predicted by a previous Ginzburg-Landau analysis. We also show that a Bose-Einstein condensate (BEC) of diquark molecules emerges in the intermediate density region, and as a result, a BEC-BCS crossover is realized with increasing quark chemical potential. |
hep-ph/9508372 | Pervushin Victor Nikolayevich | V.N. Pervushin, V.V. Papoyan, G.A. Gogilidze A.M. Khvedelidze, Yu.G.
Palii, and V.I. Smirichinskii | The Time Surface Term in Quantum Gravity | Latex, 9 pages, no figures, subm. to Phys. Lett. B | Phys.Lett. B365 (1996) 35-40 | 10.1016/0370-2693(95)01266-4 | Preprint ICTP: IC/95/250 | hep-ph | null | The role of the time surface term in the ADM Hamiltonian formulation of
general relativity is investigated. We show that the variable contained in the
time surface term (the scale factor) plays the role of a time-like variable.
The conjugated variable represents the energy density in the reduced phase
space, where the Schr\"odinger like equation for a wave function is derived.
The contribution from the surface term to the phase of the wave function allows
us to define {\bf the phase time of the quantum Universe} so that it coincides
with {\bf the proper time as an invariant interval} for the classical dust
filled Universe. The quantum scenario of the evolution of the Universe filled
in by the Weinberg-Salam fields is considered. The wave function of the early
Universe as the functional from the Higgs fields and scale factor realizes the
unitary irreducible representation of the SO(4,1) group. The elementary
particle masses are determined by the angles of the scale--scalar field mixing.
| [
{
"created": "Fri, 25 Aug 1995 15:05:35 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Pervushin",
"V. N.",
""
],
[
"Papoyan",
"V. V.",
""
],
[
"Khvedelidze",
"G. A. Gogilidze A. M.",
""
],
[
"Palii",
"Yu. G.",
""
],
[
"Smirichinskii",
"V. I.",
""
]
] | The role of the time surface term in the ADM Hamiltonian formulation of general relativity is investigated. We show that the variable contained in the time surface term (the scale factor) plays the role of a time-like variable. The conjugated variable represents the energy density in the reduced phase space, where the Schr\"odinger like equation for a wave function is derived. The contribution from the surface term to the phase of the wave function allows us to define {\bf the phase time of the quantum Universe} so that it coincides with {\bf the proper time as an invariant interval} for the classical dust filled Universe. The quantum scenario of the evolution of the Universe filled in by the Weinberg-Salam fields is considered. The wave function of the early Universe as the functional from the Higgs fields and scale factor realizes the unitary irreducible representation of the SO(4,1) group. The elementary particle masses are determined by the angles of the scale--scalar field mixing. |
1212.0612 | Sudhanwa Patra Dr. | Sudhanwa Patra (CETMS, SOA Univ., Bhubaneswar) | $0 \nu\, \beta \beta$ decay process in left-right symmetric models
without scalar Bidoublet | 9 pages, 4 figures, Published in Phys. Rev D 87 (2013) 015002. arXiv
admin note: text overlap with arXiv:1112.3061, arXiv:1001.1341 by other
authors | Phys. Rev D 87 (2013) 015002 | 10.1103/PhysRevD.87.015002 | null | hep-ph nucl-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present an alternative formulation of the left-right symmetric theory
where the scalar sector consists of two Higgs doublets which differs from the
standard version of the left-right model that makes use of $L-$ and $R-$ Higgs
triplets and a Higgs bi-doublet. The basic idea is to consider few extra
charged iso-singlet fields and the fermion masses can be realized by
integrating out these heavy isosinglet fields. We also give a detailed
discussion on neutrinoless double beta decay in this particular left-right
symmetric theory where the right-handed Majorana neutrino can be of MeV range.
With this right-handed Majorana mass around MeV scale, the contribution to
neutrinoless double beta decay coming from the right-handed current can be
comparable with the contributions coming from the standard left-handed sector
only if the right-handed gauge boson mass is around 5 TeV, and with this
operative scale of $W_R$ around few TeV, it is possible to probe at LHC. We
have briefly commented on cosmological constraints coming from the big-bang
nucleosynthesis and Universe cosmology to the right-handed neutrinos involved
in this discussion.
| [
{
"created": "Tue, 4 Dec 2012 04:45:02 GMT",
"version": "v1"
},
{
"created": "Thu, 31 Jan 2013 08:52:34 GMT",
"version": "v2"
}
] | 2013-02-01 | [
[
"Patra",
"Sudhanwa",
"",
"CETMS, SOA Univ., Bhubaneswar"
]
] | We present an alternative formulation of the left-right symmetric theory where the scalar sector consists of two Higgs doublets which differs from the standard version of the left-right model that makes use of $L-$ and $R-$ Higgs triplets and a Higgs bi-doublet. The basic idea is to consider few extra charged iso-singlet fields and the fermion masses can be realized by integrating out these heavy isosinglet fields. We also give a detailed discussion on neutrinoless double beta decay in this particular left-right symmetric theory where the right-handed Majorana neutrino can be of MeV range. With this right-handed Majorana mass around MeV scale, the contribution to neutrinoless double beta decay coming from the right-handed current can be comparable with the contributions coming from the standard left-handed sector only if the right-handed gauge boson mass is around 5 TeV, and with this operative scale of $W_R$ around few TeV, it is possible to probe at LHC. We have briefly commented on cosmological constraints coming from the big-bang nucleosynthesis and Universe cosmology to the right-handed neutrinos involved in this discussion. |
0808.3629 | Jian Zhou Mr. | Jian Zhou, Feng Yuan, Zuo-Tang Liang | Hyperon Polarization in Unpolarized Scattering Processes | 13 pages, 1 figure | Phys.Rev.D78:114008,2008 | 10.1103/PhysRevD.78.114008 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Transverse polarization in the Hyperon production in the unpolarized deep
inelastic scattering and pp collisions is studied in the twist-three approach,
considering the contribution from the quark-gluon-antiquark correlation
distribution in nucleon. We further compare our results for deep inelastic
scattering to a transverse momentum dependent factorization approach, and find
consistency between the two approaches in the intermediate transverse momentum
region. We also find that in pp collisions, there are only derivative terms
contributions, and the non-derivative terms vanish.
| [
{
"created": "Wed, 27 Aug 2008 18:09:09 GMT",
"version": "v1"
}
] | 2008-12-30 | [
[
"Zhou",
"Jian",
""
],
[
"Yuan",
"Feng",
""
],
[
"Liang",
"Zuo-Tang",
""
]
] | Transverse polarization in the Hyperon production in the unpolarized deep inelastic scattering and pp collisions is studied in the twist-three approach, considering the contribution from the quark-gluon-antiquark correlation distribution in nucleon. We further compare our results for deep inelastic scattering to a transverse momentum dependent factorization approach, and find consistency between the two approaches in the intermediate transverse momentum region. We also find that in pp collisions, there are only derivative terms contributions, and the non-derivative terms vanish. |
1911.02020 | Yang-Ting Chien | Kai-Feng Chen and Yang-Ting Chien | Deep Learning Jet Substructure from Two-Particle Correlation | 5 pages, 4 figures, example code and test sample available at
github.com/kfjack/2PCNN | Phys. Rev. D 101, 114025 (2020) | 10.1103/PhysRevD.101.114025 | YITP-SB-19-30 | hep-ph hep-ex nucl-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Deciphering the complex information contained in jets produced in collider
events requires a physical organization of the jet data. We introduce
two-particle correlations (2PCs) by pairing individual particles as the initial
jet representation from which a probabilistic model can be built. Particle
momenta, as well as particle types and vertex information are included in the
correlation. A novel, two-particle correlation neural network (2PCNN)
architecture is constructed by combining neural network based filters on 2PCs
and a deep neural network for capturing jet kinematic information. The 2PCNN is
applied to boosted boson and heavy flavor tagging, and it achieves excellent
performance by comparing to models based on telescoping deconstruction. Major
correlation pairs exploited in the trained models are also identified, which
shed light on the physical significance of certain jet substructure.
| [
{
"created": "Tue, 5 Nov 2019 19:00:01 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Dec 2019 04:59:17 GMT",
"version": "v2"
}
] | 2020-07-01 | [
[
"Chen",
"Kai-Feng",
""
],
[
"Chien",
"Yang-Ting",
""
]
] | Deciphering the complex information contained in jets produced in collider events requires a physical organization of the jet data. We introduce two-particle correlations (2PCs) by pairing individual particles as the initial jet representation from which a probabilistic model can be built. Particle momenta, as well as particle types and vertex information are included in the correlation. A novel, two-particle correlation neural network (2PCNN) architecture is constructed by combining neural network based filters on 2PCs and a deep neural network for capturing jet kinematic information. The 2PCNN is applied to boosted boson and heavy flavor tagging, and it achieves excellent performance by comparing to models based on telescoping deconstruction. Major correlation pairs exploited in the trained models are also identified, which shed light on the physical significance of certain jet substructure. |
hep-ph/0107210 | Liliana Micu | L.Micu | Relativistic covariance and the bound state wave function | 6 pages, RevteX | null | null | null | hep-ph | null | We establish a relation between the solution of a relativistic bound state
equation in quantum mechanics and the field representation of a bound state
with the aid of creation and annihilation operators. We show that a bound
system can be represented by a gas of free constituents and a classical
effective field representing the countless quantum fluctuations generating the
binding potential. The distribution function of the internal momenta is given
by the projection of the free states on the solution of a relativistic bound
state equation in the rest frame of the bound system. In this approach Lorentz
covariance, mass-shell constraints and single particle normalizability of the
bound state function are simultaneously and explicitly satisfied. The
discussion is made for a two particle bound state and can be easily generalized
to the case of three or more particles.
| [
{
"created": "Thu, 19 Jul 2001 15:18:24 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Micu",
"L.",
""
]
] | We establish a relation between the solution of a relativistic bound state equation in quantum mechanics and the field representation of a bound state with the aid of creation and annihilation operators. We show that a bound system can be represented by a gas of free constituents and a classical effective field representing the countless quantum fluctuations generating the binding potential. The distribution function of the internal momenta is given by the projection of the free states on the solution of a relativistic bound state equation in the rest frame of the bound system. In this approach Lorentz covariance, mass-shell constraints and single particle normalizability of the bound state function are simultaneously and explicitly satisfied. The discussion is made for a two particle bound state and can be easily generalized to the case of three or more particles. |
1108.0827 | Francesco Murgia | Umberto D'Alesio (1,2), Leonard Gamberg (3), Zhong-Bo Kang (4),
Francesco Murgia (2), Cristian Pisano (1,2) ((1) University of Cagliari,
Italy, (2) INFN, Cagliari, Italy, (3) Penn State Berks, Pennsylvania, USA,
(4) RIKEN BNL, New York, USA) | Testing the process dependence of the Sivers function via hadron
distributions inside a jet | RevTex4, 5 pages, 2 figures; v2: minor corrections, references added;
matches the version published in Phys. Lett. B | Phys. Lett. B704 (2011) 637-640 | 10.1016/j.physletb.2011.09.067 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the process dependence of the Sivers function by considering the
impact of color-gauge invariant initial and final state interactions on
transverse spin asymmetries in proton-proton reactions within the framework of
the transverse momentum dependent (TMD), generalized parton model. To this aim,
we consider the azimuthal distribution of leading pions inside a fragmenting
jet as well as single inclusive jet asymmetry in polarized proton proton
collisions. In contrast to single inclusive pion production, in both cases we
can isolate the Sivers contribution and thereby study its process dependence.
The predictions for the Sivers asymmetry obtained with and without inclusion of
color gauge factors are comparable in size but with opposite signs. We conclude
that both processes represent unique opportunities to discriminate among the
two approaches and test the universality properties of the Sivers function in
hadronic reactions.
| [
{
"created": "Wed, 3 Aug 2011 12:27:17 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Oct 2011 15:18:55 GMT",
"version": "v2"
}
] | 2011-10-27 | [
[
"D'Alesio",
"Umberto",
""
],
[
"Gamberg",
"Leonard",
""
],
[
"Kang",
"Zhong-Bo",
""
],
[
"Murgia",
"Francesco",
""
],
[
"Pisano",
"Cristian",
""
]
] | We study the process dependence of the Sivers function by considering the impact of color-gauge invariant initial and final state interactions on transverse spin asymmetries in proton-proton reactions within the framework of the transverse momentum dependent (TMD), generalized parton model. To this aim, we consider the azimuthal distribution of leading pions inside a fragmenting jet as well as single inclusive jet asymmetry in polarized proton proton collisions. In contrast to single inclusive pion production, in both cases we can isolate the Sivers contribution and thereby study its process dependence. The predictions for the Sivers asymmetry obtained with and without inclusion of color gauge factors are comparable in size but with opposite signs. We conclude that both processes represent unique opportunities to discriminate among the two approaches and test the universality properties of the Sivers function in hadronic reactions. |
2006.02969 | Peter Lichard | Peter Lichard | Pionium as a source of false events in the $K\to\pi\nu\bar\nu$ decays | 4 pages, no figures, compatible with the published version | Phys. Rev. D 102, 113005 (2020) | 10.1103/PhysRevD.102.113005 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We suggest that the decay modes of kaons with a pion and a pionium
($\pi^+\pi^-$ atom) in the final state can constitute a not yet considered
background to the very rare decay $K\to\pi\nu\bar\nu$. In fact, a part of
pioniums may escape the decay region before decaying into two $\pi^0$s (or to
$\pi^0\pi^0\gamma$ in the case of excited pionium). To illustrate the
importance of this background, we show that it may even explain, under some
assumptions, the unexpected $K_L$ decay events that appeared in the KOTO
experiment.
| [
{
"created": "Thu, 4 Jun 2020 15:49:01 GMT",
"version": "v1"
},
{
"created": "Thu, 24 Sep 2020 10:26:34 GMT",
"version": "v2"
},
{
"created": "Sun, 17 Jan 2021 20:26:39 GMT",
"version": "v3"
}
] | 2021-01-19 | [
[
"Lichard",
"Peter",
""
]
] | We suggest that the decay modes of kaons with a pion and a pionium ($\pi^+\pi^-$ atom) in the final state can constitute a not yet considered background to the very rare decay $K\to\pi\nu\bar\nu$. In fact, a part of pioniums may escape the decay region before decaying into two $\pi^0$s (or to $\pi^0\pi^0\gamma$ in the case of excited pionium). To illustrate the importance of this background, we show that it may even explain, under some assumptions, the unexpected $K_L$ decay events that appeared in the KOTO experiment. |
hep-ph/0206268 | Yosef Nir | Michael Dine, Yosef Nir, and Yael Shadmi | Product Groups, Discrete Symmetries, and Grand Unification | 23 pages; no figures; revtex4 | Phys.Rev. D66 (2002) 115001 | 10.1103/PhysRevD.66.115001 | SCIPP-02-09; WIS/24/02-Jun-DPP | hep-ph | null | We study grand unified theories based on an SU(5)xSU(5) gauge group in which
the GUT scale, M_{GUT}, is the VEV of an exact or approximate modulus, and in
which fast proton decay is avoided through a combination of a large triplet
mass and small triplet couplings. These features are achieved by discrete
symmetries. In many of our models, M_{GUT} is generated naturally by the
balance of higher dimension terms that lift the GUT modulus potential, and soft
supersymmetry breaking masses. The theories often lead to interesting patterns
of quark and lepton masses. We also discuss some distinctions between grand
unified theories and string unification.
| [
{
"created": "Wed, 26 Jun 2002 11:08:54 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Dine",
"Michael",
""
],
[
"Nir",
"Yosef",
""
],
[
"Shadmi",
"Yael",
""
]
] | We study grand unified theories based on an SU(5)xSU(5) gauge group in which the GUT scale, M_{GUT}, is the VEV of an exact or approximate modulus, and in which fast proton decay is avoided through a combination of a large triplet mass and small triplet couplings. These features are achieved by discrete symmetries. In many of our models, M_{GUT} is generated naturally by the balance of higher dimension terms that lift the GUT modulus potential, and soft supersymmetry breaking masses. The theories often lead to interesting patterns of quark and lepton masses. We also discuss some distinctions between grand unified theories and string unification. |
1212.2411 | Kher Sham Lim | Martin Holthausen, Kher Sham Lim, Manfred Lindner | Lepton Mixing Patterns from a Scan of Finite Discrete Groups | 15 pages, 3 figures, references added and minor improvements, matches
version to be appeared in Physics Letters B | null | 10.1016/j.physletb.2013.02.047 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The recent discovery of a non-zero value of the mixing angle theta_13 has
ruled out tri-bimaximal mixing as the correct lepton mixing pattern generated
by some discrete flavor symmetry (barring large next-to-leading order
corrections in concrete models). In this work we assume that neutrinos are
Majorana particles and perform a general scan of all finite discrete groups
with order less than 1536 to obtain their predictions for lepton mixing angles.
To our surprise, the scan of over one million groups only yields 3 interesting
groups that give lepton mixing patterns which lie within 3-sigma of the current
best global fit values. A systematic way to categorize such groups and the
implications for flavor symmetry are discussed.
| [
{
"created": "Tue, 11 Dec 2012 13:04:08 GMT",
"version": "v1"
},
{
"created": "Fri, 1 Mar 2013 14:24:40 GMT",
"version": "v2"
}
] | 2013-04-03 | [
[
"Holthausen",
"Martin",
""
],
[
"Lim",
"Kher Sham",
""
],
[
"Lindner",
"Manfred",
""
]
] | The recent discovery of a non-zero value of the mixing angle theta_13 has ruled out tri-bimaximal mixing as the correct lepton mixing pattern generated by some discrete flavor symmetry (barring large next-to-leading order corrections in concrete models). In this work we assume that neutrinos are Majorana particles and perform a general scan of all finite discrete groups with order less than 1536 to obtain their predictions for lepton mixing angles. To our surprise, the scan of over one million groups only yields 3 interesting groups that give lepton mixing patterns which lie within 3-sigma of the current best global fit values. A systematic way to categorize such groups and the implications for flavor symmetry are discussed. |
1011.5060 | Leonard Lesniak | L. Lesniak, J.-P. Dedonder, A. Furman, R. Kaminski, B. Loiseau | Are scalar mesons visible in B+- --> pi+pi-pi+- decays? | 4 pages, 2 figures, contribution to the 35th International Conference
on High Energy Physics, July 22-28 2010, Paris, France | PoS ICHEP2010:208,2010 | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Two pion effective mass and helicity angle distributions in the charged
B-meson decays into three charged pions are studied. The weak decay amplitudes
are calculated in the framework of the QCD factorization approximation. The
strong interactions between the pairs of pions are taken into account using
scalar and vector pion form factors. The scalar form factors are constrained by
data on pion-pion, kaon-antikaon and four pion production incorporated into a
multichannel model of the coupled amplitudes. The vector form factor is
obtained from the Belle Collaboration analysis of the tau- --> pi- pi0 nu_{tau}
decays. The theoretical distributions of the dipion effective masses are
compared with the corresponding results of the recent Dalitz plot analysis of
B+- --> pi+pi-pi+- decays performed by the BABAR Collaboration. We find that
the S-wave dipion amplitude, although much smaller than the P-wave amplitude,
plays an important role even in the rho(770) mass range. We show that the
helicity angle distribution is strongly asymmetric in the rho- meson range.
This effect can be attributed to the broad f0(600)(or sigma) meson. The fact
that the signal of the B+- --> f0(980) pi+- decay has not been found in the
experimental analysis can be easily explained in our model since the relevant B
decay amplitude is proportional to the scalar form factor which has a dip at
the f0(980) mass. We obtain a unified unitary description of the contribution
of the three scalar resonances f0(600), f0(980) and f0(1400) in terms of the
pion non-strange scalar form factor.
| [
{
"created": "Tue, 23 Nov 2010 11:19:34 GMT",
"version": "v1"
}
] | 2015-03-17 | [
[
"Lesniak",
"L.",
""
],
[
"Dedonder",
"J. -P.",
""
],
[
"Furman",
"A.",
""
],
[
"Kaminski",
"R.",
""
],
[
"Loiseau",
"B.",
""
]
] | Two pion effective mass and helicity angle distributions in the charged B-meson decays into three charged pions are studied. The weak decay amplitudes are calculated in the framework of the QCD factorization approximation. The strong interactions between the pairs of pions are taken into account using scalar and vector pion form factors. The scalar form factors are constrained by data on pion-pion, kaon-antikaon and four pion production incorporated into a multichannel model of the coupled amplitudes. The vector form factor is obtained from the Belle Collaboration analysis of the tau- --> pi- pi0 nu_{tau} decays. The theoretical distributions of the dipion effective masses are compared with the corresponding results of the recent Dalitz plot analysis of B+- --> pi+pi-pi+- decays performed by the BABAR Collaboration. We find that the S-wave dipion amplitude, although much smaller than the P-wave amplitude, plays an important role even in the rho(770) mass range. We show that the helicity angle distribution is strongly asymmetric in the rho- meson range. This effect can be attributed to the broad f0(600)(or sigma) meson. The fact that the signal of the B+- --> f0(980) pi+- decay has not been found in the experimental analysis can be easily explained in our model since the relevant B decay amplitude is proportional to the scalar form factor which has a dip at the f0(980) mass. We obtain a unified unitary description of the contribution of the three scalar resonances f0(600), f0(980) and f0(1400) in terms of the pion non-strange scalar form factor. |
1210.1064 | Mikko Laine | Y. Burnier, M. Laine | Massive vector current correlator in thermal QCD | 28 pages. v2: references and clarifications added, published version | JHEP 1211 (2012) 086 | 10.1007/JHEP11(2012)086 | null | hep-ph hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present an NLO analysis of the massive vector current correlator at
temperatures above a few hundred MeV. The physics of this correlator originates
from a transport peak, related to heavy quark diffusion, and from the
quark-antiquark threshold, related to quarkonium physics. In the bottom case
both can be studied with separate effective theories, but for charm these may
not be accurate, so a study within the full theory is needed. Working in
imaginary time, the NLO correlator can be computed in unresummed perturbation
theory; comparing with lattice data, we find good agreement. Subsequently we
inspect how non-perturbative modifications of the transport peak would affect
the imaginary-time correlator. The massive NLO quark-number susceptibility is
also contrasted with numerical measurement.
| [
{
"created": "Wed, 3 Oct 2012 11:32:20 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Dec 2012 10:59:35 GMT",
"version": "v2"
}
] | 2015-06-11 | [
[
"Burnier",
"Y.",
""
],
[
"Laine",
"M.",
""
]
] | We present an NLO analysis of the massive vector current correlator at temperatures above a few hundred MeV. The physics of this correlator originates from a transport peak, related to heavy quark diffusion, and from the quark-antiquark threshold, related to quarkonium physics. In the bottom case both can be studied with separate effective theories, but for charm these may not be accurate, so a study within the full theory is needed. Working in imaginary time, the NLO correlator can be computed in unresummed perturbation theory; comparing with lattice data, we find good agreement. Subsequently we inspect how non-perturbative modifications of the transport peak would affect the imaginary-time correlator. The massive NLO quark-number susceptibility is also contrasted with numerical measurement. |
1511.01122 | Hendrik Vogel | N\'uria Vinyoles and Hendrik Vogel | Minicharged Particles from the Sun: A Cutting-Edge Bound | Improved statistical treatment, figures and bounds updated, matches
the version accepted in JCAP | JCAP03(2016)002 | 10.1088/1475-7516/2016/03/002 | MPP-2015-199 | hep-ph astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the impact on the Sun of an exotic energy-loss channel caused by
plasmon decay into fermionic minicharged particles with charge $\epsilon e$ and
mass $m_f$. We compare solar models with this extra emission to
helioseismological and neutrino data, obtaining a bound $\epsilon <2.2\times
10^{-14}\ ({\rm 95\%\, CL})$ for $m_f\lesssim 25 \, \text{eV}$. Our result is
comparable to previous limits from the cooling of globular cluster stars, while
at the same time it is better understood and takes theoretical and
observational errors into account.
| [
{
"created": "Tue, 3 Nov 2015 21:27:15 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Mar 2016 14:13:56 GMT",
"version": "v2"
}
] | 2016-03-08 | [
[
"Vinyoles",
"Núria",
""
],
[
"Vogel",
"Hendrik",
""
]
] | We study the impact on the Sun of an exotic energy-loss channel caused by plasmon decay into fermionic minicharged particles with charge $\epsilon e$ and mass $m_f$. We compare solar models with this extra emission to helioseismological and neutrino data, obtaining a bound $\epsilon <2.2\times 10^{-14}\ ({\rm 95\%\, CL})$ for $m_f\lesssim 25 \, \text{eV}$. Our result is comparable to previous limits from the cooling of globular cluster stars, while at the same time it is better understood and takes theoretical and observational errors into account. |
hep-ph/9908327 | Jonathan Bagger | Jonathan A. Bagger, Adam F. Falk and Morris Swartz | Precision Observables and Electroweak Theories | 4.01 pages, revtex. 2 eps figures | Phys.Rev.Lett. 84 (2000) 1385-1388 | 10.1103/PhysRevLett.84.1385 | null | hep-ph hep-ex | null | We compute the bounds from precision observables on alternative theories of
electroweak symmetry breaking. We show that a cut-off as large as 3 TeV can be
accomodated by the present data, without unnatural fine tuning.
| [
{
"created": "Wed, 11 Aug 1999 21:33:00 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Aug 1999 23:54:45 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Bagger",
"Jonathan A.",
""
],
[
"Falk",
"Adam F.",
""
],
[
"Swartz",
"Morris",
""
]
] | We compute the bounds from precision observables on alternative theories of electroweak symmetry breaking. We show that a cut-off as large as 3 TeV can be accomodated by the present data, without unnatural fine tuning. |
hep-ph/9507466 | Nathan Francis Lepora | Nathan F. Lepora and Anne-Christine Davis | Examples of Embedded Defects (in Particle Physics and Condensed Matter) | final corrections. latex file | Phys.Rev. D58 (1998) 125028 | 10.1103/PhysRevD.58.125028 | DAMTP-95-44, CERN-TH/95-210 | hep-ph hep-th | null | We present a series of examples designed to clarify the formalism of the
companion paper `Embedded Vortices'. After summarising this formalism in a
prescriptive sense, we run through several examples: firstly, deriving the
embedded defect spectrum for Weinberg-Salam theory, then discussing several
examples designed to illustrate facets of the formalism. We then calculate the
embedded defect spectrum for three physical Grand Unified Theories and conclude
with a discussion of vortices formed in the superfluid $^3$He-A phase
transition.
| [
{
"created": "Mon, 31 Jul 1995 14:33:36 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Aug 1995 14:50:39 GMT",
"version": "v2"
},
{
"created": "Fri, 2 Feb 1996 18:06:44 GMT",
"version": "v3"
},
{
"created": "Tue, 21 Oct 1997 19:12:14 GMT",
"version": "v4"
},
{
"created": "Wed, 21 Jan 1998 11:41:41 GMT",
"version": "v5"
},
{
"created": "Mon, 18 May 1998 17:55:36 GMT",
"version": "v6"
}
] | 2009-10-28 | [
[
"Lepora",
"Nathan F.",
""
],
[
"Davis",
"Anne-Christine",
""
]
] | We present a series of examples designed to clarify the formalism of the companion paper `Embedded Vortices'. After summarising this formalism in a prescriptive sense, we run through several examples: firstly, deriving the embedded defect spectrum for Weinberg-Salam theory, then discussing several examples designed to illustrate facets of the formalism. We then calculate the embedded defect spectrum for three physical Grand Unified Theories and conclude with a discussion of vortices formed in the superfluid $^3$He-A phase transition. |
hep-ph/0607314 | Daniele Dominici | J. Bechi, R. Casalbuoni, S. De Curtis and D. Dominici | Effective fermion couplings in warped 5D Higgsless theories | Latex file, 23 pages, 1 eps figure | Phys.Rev.D74:095002,2006 | 10.1103/PhysRevD.74.095002 | null | hep-ph hep-th | null | We consider a five dimensional SU(2) gauge theory with fermions in the bulk
and with additional SU(2) and U(1) kinetic terms on the branes. The electroweak
breaking is obtained by boundary conditions. After deconstruction, fermions in
the bulk are eliminated by using their equations of motion. In this way
Standard Model fermion mass terms and direct couplings to the internal gauge
bosons of the moose are generated. The presence of these new couplings gives a
new contribution to the epsilon_3 parameter in addition to the gauge boson
term. This allows the possibility of a cancellation between the two
contributions, which can be local (site by site) or global. Going back to the
continuum, we show that the implementation of local cancellation in any generic
warped metric leaves massless fermions. This is due to the presence of one
horizon on the infrared brane. However we can require a global cancellation of
the new physics contributions to the epsilon_3 parameter. This fixes relations
among the warp factor and the parameters of the fermion and gauge sectors.
| [
{
"created": "Fri, 28 Jul 2006 10:59:28 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Bechi",
"J.",
""
],
[
"Casalbuoni",
"R.",
""
],
[
"De Curtis",
"S.",
""
],
[
"Dominici",
"D.",
""
]
] | We consider a five dimensional SU(2) gauge theory with fermions in the bulk and with additional SU(2) and U(1) kinetic terms on the branes. The electroweak breaking is obtained by boundary conditions. After deconstruction, fermions in the bulk are eliminated by using their equations of motion. In this way Standard Model fermion mass terms and direct couplings to the internal gauge bosons of the moose are generated. The presence of these new couplings gives a new contribution to the epsilon_3 parameter in addition to the gauge boson term. This allows the possibility of a cancellation between the two contributions, which can be local (site by site) or global. Going back to the continuum, we show that the implementation of local cancellation in any generic warped metric leaves massless fermions. This is due to the presence of one horizon on the infrared brane. However we can require a global cancellation of the new physics contributions to the epsilon_3 parameter. This fixes relations among the warp factor and the parameters of the fermion and gauge sectors. |
hep-ph/9810504 | Vincent Lafage | V. Lafage, T. Ishikawa, T. Kaneko, T. Kon, Y. Kurihara, H. Tanaka | Spin and spin-spin correlations in chargino pair production at future
linear e+e- colliders | 23 pages, 7 figures, 6 tables; added reference for section 1 | Int.J.Mod.Phys. A14 (1999) 5075-5092 | 10.1142/S0217751X99002396 | KEK-CP-078 | hep-ph | null | A possibility to measure the spin and spin-spin correlations of a chargino
pair is investigated in the process electron positron -> chargino_1
anti-chargino_1 -> (neutralino_1 quark anti-quark) (neutralino_1 quark
anti-quark) at future linear-collider energies. The total and the differential
cross sections are calculated by the GRACE system which allows for the full
spin correlation. Experimental sensitivity of the measurements are examined by
assuming the limited detector resolution, the initial state radiation and the
beam-beam effect (beamstrahlung). It is found that generally the spin-spin
correlation can only be measured with a lower sensitivity than the chargino
spin itself. The dependence of the correlation measurements on the relevant
SUSY parameters can be seen for a light sneutrino case, but the situation
becomes worse for a heavier sneutrino.
| [
{
"created": "Wed, 28 Oct 1998 14:13:50 GMT",
"version": "v1"
},
{
"created": "Sun, 13 Dec 1998 10:56:05 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Lafage",
"V.",
""
],
[
"Ishikawa",
"T.",
""
],
[
"Kaneko",
"T.",
""
],
[
"Kon",
"T.",
""
],
[
"Kurihara",
"Y.",
""
],
[
"Tanaka",
"H.",
""
]
] | A possibility to measure the spin and spin-spin correlations of a chargino pair is investigated in the process electron positron -> chargino_1 anti-chargino_1 -> (neutralino_1 quark anti-quark) (neutralino_1 quark anti-quark) at future linear-collider energies. The total and the differential cross sections are calculated by the GRACE system which allows for the full spin correlation. Experimental sensitivity of the measurements are examined by assuming the limited detector resolution, the initial state radiation and the beam-beam effect (beamstrahlung). It is found that generally the spin-spin correlation can only be measured with a lower sensitivity than the chargino spin itself. The dependence of the correlation measurements on the relevant SUSY parameters can be seen for a light sneutrino case, but the situation becomes worse for a heavier sneutrino. |
2108.12532 | Laura Xiomara Gutierrez Guerrero Xiomara | L.X. Guti\'errez-Guerrero, A. Alfaro, A. Raya | Mass Spectra of One or Two Heavy Quark Mesons and Diquarks within a
Nonrelativistic Potential Model | 15 pages, 5 figures, 6 tables | International Journal of Modern Physics A 2021 | 10.1142/S0217751X21501712 | null | hep-ph nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article, the mass spectra of mesons with one or two heavy quarks and
their diquarks partners are estimated within a non-relativistic framework by
solving Schr\"odinger equation with an effective potential inspired by a
symmetry preserving Poincar\'e covariant vector-vector contact interaction
model of quantum chromodynamics. Matrix Numerov method is implemented for this
purpose. In our survey of mesons with heavy quarks, we fix the model parameter
to the masses of ground-states and then extend our calculations for radial
excitations and diquarks. The potential model used in this work gives results
which are in good agreement with experimental data and other theoretical
calculations.
| [
{
"created": "Fri, 27 Aug 2021 23:58:26 GMT",
"version": "v1"
}
] | 2021-08-31 | [
[
"Gutiérrez-Guerrero",
"L. X.",
""
],
[
"Alfaro",
"A.",
""
],
[
"Raya",
"A.",
""
]
] | In this article, the mass spectra of mesons with one or two heavy quarks and their diquarks partners are estimated within a non-relativistic framework by solving Schr\"odinger equation with an effective potential inspired by a symmetry preserving Poincar\'e covariant vector-vector contact interaction model of quantum chromodynamics. Matrix Numerov method is implemented for this purpose. In our survey of mesons with heavy quarks, we fix the model parameter to the masses of ground-states and then extend our calculations for radial excitations and diquarks. The potential model used in this work gives results which are in good agreement with experimental data and other theoretical calculations. |
hep-ph/0011372 | Prem Prakash Srivastava | Prem P. Srivastava and Stanley J. Brodsky (SLAC, Stanford University,
CA) | Light-Front-Quantized QCD in Light-Cone Gauge: The Doubly Transverse
Gauge Propagator | 32 pages, 2 figures, plain Latex; added Appendix C with comments on
spectral representation and unitarity, and references; Eq. (54) corrected;
version to appear in Phys. Rev. D 15 | Phys.Rev.D64:045006,2001 | 10.1103/PhysRevD.64.045006 | SLAC-pub-8711 | hep-ph hep-th nucl-th | null | The light-front (LF) quantization of QCD in light-cone gauge has a number of
remarkable advantages, including explicit unitarity, a physical Fock expansion,
the absence of ghost degrees of freedom, and the decoupling properties needed
to prove factorization theorems in high momentum transfer inclusive and
exclusive reactions. We present a systematic study of LF-quantized gauge theory
following the Dirac method and construct the Dyson-Wick S-matrix expansion
based on LF-time-ordered products. The free theory gauge field is shown to
satisfy the Lorentz condition as an operator equation as well as the light-cone
gauge condition. Its propagator is found to be transverse with respect to both
its four-momentum and the gauge direction. The interaction Hamiltonian of QCD
can be expressed in a form resembling that of covariant theory, except for
additional instantaneous interactions which can be treated systematically. The
renormalization constants in YM theory are shown to satisfy the identity
$Z_1=Z_3$ at one loop order. The QCD $\beta$ function computed in the
noncovariant light-cone gauge agrees with that known in the conventional
framework. Some comments on the relationship of our LF framework, with the
doubly transverse gauge propagator, to the analytic effective charge and
renormalization scheme defined by the pinch technique, the unitarity relations
and the spectral representation are also made. LF quantization thus provides a
consistent formulation of gauge theory, despite the fact that the hyperplanes
$x^{\pm}=0$ used to impose boundary conditions constitute characteristic
surfaces of a hyperbolic partial differential equation.
| [
{
"created": "Wed, 29 Nov 2000 18:13:03 GMT",
"version": "v1"
},
{
"created": "Tue, 22 May 2001 21:19:02 GMT",
"version": "v2"
}
] | 2009-09-11 | [
[
"Srivastava",
"Prem P.",
"",
"SLAC, Stanford University,\n CA"
],
[
"Brodsky",
"Stanley J.",
"",
"SLAC, Stanford University,\n CA"
]
] | The light-front (LF) quantization of QCD in light-cone gauge has a number of remarkable advantages, including explicit unitarity, a physical Fock expansion, the absence of ghost degrees of freedom, and the decoupling properties needed to prove factorization theorems in high momentum transfer inclusive and exclusive reactions. We present a systematic study of LF-quantized gauge theory following the Dirac method and construct the Dyson-Wick S-matrix expansion based on LF-time-ordered products. The free theory gauge field is shown to satisfy the Lorentz condition as an operator equation as well as the light-cone gauge condition. Its propagator is found to be transverse with respect to both its four-momentum and the gauge direction. The interaction Hamiltonian of QCD can be expressed in a form resembling that of covariant theory, except for additional instantaneous interactions which can be treated systematically. The renormalization constants in YM theory are shown to satisfy the identity $Z_1=Z_3$ at one loop order. The QCD $\beta$ function computed in the noncovariant light-cone gauge agrees with that known in the conventional framework. Some comments on the relationship of our LF framework, with the doubly transverse gauge propagator, to the analytic effective charge and renormalization scheme defined by the pinch technique, the unitarity relations and the spectral representation are also made. LF quantization thus provides a consistent formulation of gauge theory, despite the fact that the hyperplanes $x^{\pm}=0$ used to impose boundary conditions constitute characteristic surfaces of a hyperbolic partial differential equation. |
1101.1985 | Kim Maltman | Kim Maltman | Hadronic Tau Decay Based Determinations of |V_us| | 5 pages, 4 figures. Prepared for the Proceedings of CKM2010, the 6th
International Workshop on the CKM Unitarity Triangle, University of Warwick,
UK, 6-10 September 2010 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I review sum rule determinations of |V_us| employing hadronic tau decay data,
taking into account recent HFAG updates of exclusive tau branching fractions
and paying special attention to the impact of the slow convergence of the
relevant integrated D=2 OPE series and the potential role of contributions of
as-yet-unmeasured higher multiplicity modes to the strange inclusive spectral
distribution. In addition to conventional flavor-breaking sum rule
determinations, information obtainable from mixed tau-electroproduction sum
rules having much reduced OPE uncertainties, and from sum rules based on the
inclusive strange decay distribution alone, is also considered. Earlier
discrepancies with the expectations of 3-family unitarity are found to be
reduced, both the switch to D=2 OPE treatments favored by self-consistency
tests and the increase in the strange branching fractions playing a role in
this reduction.
| [
{
"created": "Mon, 10 Jan 2011 22:56:39 GMT",
"version": "v1"
}
] | 2011-01-12 | [
[
"Maltman",
"Kim",
""
]
] | I review sum rule determinations of |V_us| employing hadronic tau decay data, taking into account recent HFAG updates of exclusive tau branching fractions and paying special attention to the impact of the slow convergence of the relevant integrated D=2 OPE series and the potential role of contributions of as-yet-unmeasured higher multiplicity modes to the strange inclusive spectral distribution. In addition to conventional flavor-breaking sum rule determinations, information obtainable from mixed tau-electroproduction sum rules having much reduced OPE uncertainties, and from sum rules based on the inclusive strange decay distribution alone, is also considered. Earlier discrepancies with the expectations of 3-family unitarity are found to be reduced, both the switch to D=2 OPE treatments favored by self-consistency tests and the increase in the strange branching fractions playing a role in this reduction. |
hep-ph/0401076 | Biswanath Layek | V. Sunil Kumar, Biswanath Layek, Soma Sanyal, Ajit M. Srivastava, and
Vivek K. Tiwari | Skyrmion formation in 1+1 dimensions with chemical potential | 23 pages, 5 figures, RevTex, analytical calculations for two domain
case included, more detailed probability plots presented | Int.J.Mod.Phys.A21:1199-1220,2006 | 10.1142/S0217751X06029508 | null | hep-ph cond-mat hep-th nucl-th | null | Formation of topological objects during phase transitions has been discussed
extensively in literature. In all these discussions defects and anti-defects
form with equal probabilities. In contrast, many physical situations, such as
formation of baryons in relativistic heavy-ion collisions at present energies,
flux tube formation in superconductors in the presence of external magnetic
field, and formation of superfluid vortices in a rotating vessel, require a
mechanism which can bias (say) defects over anti-defects. Such a bias can
crucially affect defect-anti-defect correlations, apart from its effects on
defect density. In this paper we initiate an investigation for the basic
mechanism of biased formation of defects. For Skyrmions in 1+1 dimensions, we
show that incorporation of a chemical potential term in the effective potential
leads to a domain structure where order parameter is spatially varying. We show
that this leads to biased formation of Skyrmions.
| [
{
"created": "Mon, 12 Jan 2004 08:32:44 GMT",
"version": "v1"
},
{
"created": "Fri, 10 Dec 2004 07:28:02 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Kumar",
"V. Sunil",
""
],
[
"Layek",
"Biswanath",
""
],
[
"Sanyal",
"Soma",
""
],
[
"Srivastava",
"Ajit M.",
""
],
[
"Tiwari",
"Vivek K.",
""
]
] | Formation of topological objects during phase transitions has been discussed extensively in literature. In all these discussions defects and anti-defects form with equal probabilities. In contrast, many physical situations, such as formation of baryons in relativistic heavy-ion collisions at present energies, flux tube formation in superconductors in the presence of external magnetic field, and formation of superfluid vortices in a rotating vessel, require a mechanism which can bias (say) defects over anti-defects. Such a bias can crucially affect defect-anti-defect correlations, apart from its effects on defect density. In this paper we initiate an investigation for the basic mechanism of biased formation of defects. For Skyrmions in 1+1 dimensions, we show that incorporation of a chemical potential term in the effective potential leads to a domain structure where order parameter is spatially varying. We show that this leads to biased formation of Skyrmions. |
hep-ph/9812435 | Juan Alcaraz | J. Alcaraz, M.A. Falag\'an, E. S\'anchez | Anomalous Gauge Boson Couplings in the e^+ e^- -> ZZ Process | 28 pages, 12 figures, final version for Phys. Rev. D | Phys.Rev.D61:075006,2000 | 10.1103/PhysRevD.61.075006 | CIEMAT-870 | hep-ph | null | We discuss experimental aspects related to the $\mathrm{e^+ e^-} \to
\mathrm{Z}\mathrm{Z}$ process and to the search for anomalous ZZV couplings
(V$= \mathrm{Z}, \gamma$) at LEP2 and future $\mathrm{e^+ e^-}$ colliders. We
present two possible approaches for a realistic study of the reaction and
discuss the differences between them. We find that the optimal method to study
double Z resonant production and to quantify the presence of anomalous
couplings requires the use of a complete four-fermion final-state calculation.
| [
{
"created": "Fri, 18 Dec 1998 17:35:32 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Dec 1998 12:20:32 GMT",
"version": "v2"
},
{
"created": "Wed, 12 Jan 2000 09:15:25 GMT",
"version": "v3"
}
] | 2011-03-23 | [
[
"Alcaraz",
"J.",
""
],
[
"Falagán",
"M. A.",
""
],
[
"Sánchez",
"E.",
""
]
] | We discuss experimental aspects related to the $\mathrm{e^+ e^-} \to \mathrm{Z}\mathrm{Z}$ process and to the search for anomalous ZZV couplings (V$= \mathrm{Z}, \gamma$) at LEP2 and future $\mathrm{e^+ e^-}$ colliders. We present two possible approaches for a realistic study of the reaction and discuss the differences between them. We find that the optimal method to study double Z resonant production and to quantify the presence of anomalous couplings requires the use of a complete four-fermion final-state calculation. |
hep-ph/0207164 | Thomas Gregoire | Thomas Gregoire and Jay G. Wacker | Deconstructing six dimensional gauge theories with strongly coupled
moose meshes | 13 pages, 6 figures | null | null | HUTP-02/A031 | hep-ph | null | It has recently been realized that five dimensional theories can be generated
dynamically from asymptotically free, QCD-like four dimensional dynamics via
``deconstruction.'' In this paper we generalize this construction to six
dimensional theories using a moose mesh with alternating weak and strong gauge
groups. A new ingredient is the appearance of self couplings between the higher
dimensional components of the gauge fields that appear as a potential for
pseudo-Goldstone bosons in the deconstructed picture. We show that, in the
limit where the weak gauge couplings are made large, such potentials are
generated with appropriate size from finite one loop correction. Our
construction has a number of applications, in particular to the constructions
of ``little Higgs'' models of electroweak symmetry breaking.
| [
{
"created": "Mon, 15 Jul 2002 18:57:56 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Gregoire",
"Thomas",
""
],
[
"Wacker",
"Jay G.",
""
]
] | It has recently been realized that five dimensional theories can be generated dynamically from asymptotically free, QCD-like four dimensional dynamics via ``deconstruction.'' In this paper we generalize this construction to six dimensional theories using a moose mesh with alternating weak and strong gauge groups. A new ingredient is the appearance of self couplings between the higher dimensional components of the gauge fields that appear as a potential for pseudo-Goldstone bosons in the deconstructed picture. We show that, in the limit where the weak gauge couplings are made large, such potentials are generated with appropriate size from finite one loop correction. Our construction has a number of applications, in particular to the constructions of ``little Higgs'' models of electroweak symmetry breaking. |
1605.04299 | Antonio Palazzo | Sanjib Kumar Agarwalla, Sabya Sachi Chatterjee, Antonio Palazzo | Octant of $\theta_{23}$ in danger with a light sterile neutrino | Brief note added; accepted for publication in Physical Review Letters | Phys. Rev. Lett. 118, 031804 (2017) | 10.1103/PhysRevLett.118.031804 | IP/BBSR/2016-6 | hep-ph hep-ex physics.ins-det | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Present global fits of world neutrino data hint towards non-maximal
$\theta_{23}$ with two nearly degenerate solutions, one in the lower octant
($\theta_{23} <\pi/4$), and the other in the higher octant ($\theta_{23}
>\pi/4$). This octant ambiguity of $\theta_{23}$ is one of the fundamental
issues in the neutrino sector, and its resolution is a crucial goal of
next-generation long-baseline (LBL) experiments. In this letter, we address for
the first time, the impact of a light eV-scale sterile neutrino towards such a
measurement, taking the Deep Underground Neutrino Experiment (DUNE) as a case
study. In the so-called 3+1 scheme involving three active and one sterile
neutrino, the $\nu_\mu \to \nu_e$ transition probability probed in the LBL
experiments acquires a new interference term via active-sterile oscillations.
We find that this novel interference term can mimic a swap of the $\theta_{23}$
octant, even if one uses the information from both neutrino and antineutrino
channels. As a consequence, the sensitivity to the octant of $\theta_{23}$ can
be completely lost and this may have serious implications in our understanding
of neutrinos from both the experimental and theoretical perspectives.
| [
{
"created": "Fri, 13 May 2016 19:42:02 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Jan 2017 16:02:46 GMT",
"version": "v2"
}
] | 2017-01-25 | [
[
"Agarwalla",
"Sanjib Kumar",
""
],
[
"Chatterjee",
"Sabya Sachi",
""
],
[
"Palazzo",
"Antonio",
""
]
] | Present global fits of world neutrino data hint towards non-maximal $\theta_{23}$ with two nearly degenerate solutions, one in the lower octant ($\theta_{23} <\pi/4$), and the other in the higher octant ($\theta_{23} >\pi/4$). This octant ambiguity of $\theta_{23}$ is one of the fundamental issues in the neutrino sector, and its resolution is a crucial goal of next-generation long-baseline (LBL) experiments. In this letter, we address for the first time, the impact of a light eV-scale sterile neutrino towards such a measurement, taking the Deep Underground Neutrino Experiment (DUNE) as a case study. In the so-called 3+1 scheme involving three active and one sterile neutrino, the $\nu_\mu \to \nu_e$ transition probability probed in the LBL experiments acquires a new interference term via active-sterile oscillations. We find that this novel interference term can mimic a swap of the $\theta_{23}$ octant, even if one uses the information from both neutrino and antineutrino channels. As a consequence, the sensitivity to the octant of $\theta_{23}$ can be completely lost and this may have serious implications in our understanding of neutrinos from both the experimental and theoretical perspectives. |
0901.3917 | Wayne W. Repko | James T. Laverty, Stanley F. Radford and Wayne W. Repko | \ga\ga and g g decay rates for equal mass heavy quarkonia | 6 pages, QCD corrections added, Tables modified | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a calculation of the two-photon and two-gluon widths for the equal
mass quarkonium states $^1S_0$, $^3P_0$ and $^3P_2$ of the charmonium and
upsilon systems. The approach taken is based on using the full relativistic
$q\bar{q}\to\ga\ga$ amplitude together with a wave function derived from the
instantaneous Bethe-Salpeter equation. Momentum space radial wave functions
obtained from an earlier fit of the charmonium and upsilon spectra are used to
evaluate the necessary integrals.
| [
{
"created": "Sun, 25 Jan 2009 19:42:49 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Feb 2009 19:10:06 GMT",
"version": "v2"
},
{
"created": "Tue, 16 Jun 2009 18:59:11 GMT",
"version": "v3"
},
{
"created": "Fri, 7 Jan 2011 19:24:51 GMT",
"version": "v4"
}
] | 2011-01-10 | [
[
"Laverty",
"James T.",
""
],
[
"Radford",
"Stanley F.",
""
],
[
"Repko",
"Wayne W.",
""
]
] | We present a calculation of the two-photon and two-gluon widths for the equal mass quarkonium states $^1S_0$, $^3P_0$ and $^3P_2$ of the charmonium and upsilon systems. The approach taken is based on using the full relativistic $q\bar{q}\to\ga\ga$ amplitude together with a wave function derived from the instantaneous Bethe-Salpeter equation. Momentum space radial wave functions obtained from an earlier fit of the charmonium and upsilon spectra are used to evaluate the necessary integrals. |
hep-ph/0703297 | Bugra Borasoy | B. Borasoy | Introduction to Chiral Perturbation Theory | 26 pages, 11 figures. Lectures given at the summer school ISSSMB 2006
in Akyaka, Turkey, September 2006 | null | 10.1007/978-3-540-73621-9_1 | HISKP-TH-07/11 | hep-ph nucl-th | null | A brief introduction to chiral perturbation theory, the effective field
theory of quantum chromodynamics at low energies, is given.
| [
{
"created": "Wed, 28 Mar 2007 09:58:08 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Borasoy",
"B.",
""
]
] | A brief introduction to chiral perturbation theory, the effective field theory of quantum chromodynamics at low energies, is given. |
hep-ph/0109290 | Fred Jegerlehner | F. Jegerlehner (DESY Zeuthen), K. Kolodziej (Silesia U.) | Results for all reactions e+ e- -> 4f, 4f + gamma with nonzero fermion
masses | 13 pages 7 tables; update Tab.1, Eq.(10) cut on m(l,l') removed, some
changes in text | Eur.Phys.J.C23:463-469,2002 | 10.1007/s100520200903 | DESY 01-143 | hep-ph | null | We accomplish our efforts to obtain predictions for all four-fermion final
states of e+ e- annihilation and the corresponding bremsstrahlung reactions
which are possible in the framework of the Standard Model. For this purpose we
have developed a program EE4FGAMMA. Our predictions are valid for fermions of
arbitrary masses and we can obtain results for total cross sections without any
collinear cut. Keeping exact fermion masses is of course required for top quark
production. We give a detailed phenomenological analysis of fermion mass
effects and real photon radiation for all channels of four-fermion production
at LEP-II and next linear collider energies.
| [
{
"created": "Fri, 28 Sep 2001 17:25:52 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Feb 2002 00:17:54 GMT",
"version": "v2"
}
] | 2011-09-13 | [
[
"Jegerlehner",
"F.",
"",
"DESY Zeuthen"
],
[
"Kolodziej",
"K.",
"",
"Silesia U."
]
] | We accomplish our efforts to obtain predictions for all four-fermion final states of e+ e- annihilation and the corresponding bremsstrahlung reactions which are possible in the framework of the Standard Model. For this purpose we have developed a program EE4FGAMMA. Our predictions are valid for fermions of arbitrary masses and we can obtain results for total cross sections without any collinear cut. Keeping exact fermion masses is of course required for top quark production. We give a detailed phenomenological analysis of fermion mass effects and real photon radiation for all channels of four-fermion production at LEP-II and next linear collider energies. |
1708.04545 | Zhi-Gang Wang | Zhi-Gang Wang | Analysis of the axialvector doubly heavy tetraquark states with QCD sum
rules | 15 pages, 16 figures | Acta Phys.Polon. B49 (2018) 1781 | 10.5506/APhysPolB.49.1781 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article, we construct the axialvector-diquark-scalar-antidiquark type
currents to interpolate the axialvector doubly heavy tetraquark states, and
study them with the QCD sum rules in details by carrying out the operator
product expansion up to the vacuum condensates of dimension 10.
| [
{
"created": "Mon, 14 Aug 2017 07:35:10 GMT",
"version": "v1"
},
{
"created": "Sun, 29 Oct 2017 12:30:37 GMT",
"version": "v2"
},
{
"created": "Sun, 4 Feb 2018 13:48:39 GMT",
"version": "v3"
},
{
"created": "Thu, 10 May 2018 08:27:54 GMT",
"version": "v4"
},
{
"created": "Sun, 1 Jul 2018 03:46:40 GMT",
"version": "v5"
}
] | 2018-10-26 | [
[
"Wang",
"Zhi-Gang",
""
]
] | In this article, we construct the axialvector-diquark-scalar-antidiquark type currents to interpolate the axialvector doubly heavy tetraquark states, and study them with the QCD sum rules in details by carrying out the operator product expansion up to the vacuum condensates of dimension 10. |
2302.04886 | Teerthal Patel | Teerthal Patel, Tanmay Vachaspati | Structure of electroweak dumbbells | 9 pages, 12 figures | null | 10.1103/PhysRevD.107.093010 | null | hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | We analyze the magnetic field of electroweak dumbbells. While the magnetic
field of the untwisted dumbbell is given by the usual dipole formula and falls
of as $1/r^3$, dumbbells with twist have a novel twisted magnetic field that
only falls off as $\cos\theta/r^2$ (in spherical coordinates). We comment on
the relevance of twisted electroweak dumbbells for understanding the coherence
of the magnetic field generated at the electroweak phase transition.
| [
{
"created": "Thu, 9 Feb 2023 19:00:02 GMT",
"version": "v1"
}
] | 2023-06-14 | [
[
"Patel",
"Teerthal",
""
],
[
"Vachaspati",
"Tanmay",
""
]
] | We analyze the magnetic field of electroweak dumbbells. While the magnetic field of the untwisted dumbbell is given by the usual dipole formula and falls of as $1/r^3$, dumbbells with twist have a novel twisted magnetic field that only falls off as $\cos\theta/r^2$ (in spherical coordinates). We comment on the relevance of twisted electroweak dumbbells for understanding the coherence of the magnetic field generated at the electroweak phase transition. |
hep-ph/9802233 | Ruth Haeckl | Ruth Haeckl, Viktor Hund and Hartmut Pilkuhn | Eight-component two-fermion equations | Revtex, accepted for publication in Phys. Rev. A | null | 10.1103/PhysRevA.57.3268 | TTP97-07 | hep-ph physics.atom-ph | null | An eight-component formalism is proposed for the relativistic two-fermion
problem. In QED, it extends the applicability of the Dirac equation with
hyperfine interaction to the positronium case. The use of exact relativistic
two-body kinematics entails a CP-invariant spectrum which is symmetric in the
total cms energy. It allows the extension of recent \alpha^6 recoil corrections
to the positronium case, and implies new recoil corrections to the fine and
hyperfine structures and to the Bethe logarithm.
| [
{
"created": "Tue, 3 Feb 1998 18:11:01 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Haeckl",
"Ruth",
""
],
[
"Hund",
"Viktor",
""
],
[
"Pilkuhn",
"Hartmut",
""
]
] | An eight-component formalism is proposed for the relativistic two-fermion problem. In QED, it extends the applicability of the Dirac equation with hyperfine interaction to the positronium case. The use of exact relativistic two-body kinematics entails a CP-invariant spectrum which is symmetric in the total cms energy. It allows the extension of recent \alpha^6 recoil corrections to the positronium case, and implies new recoil corrections to the fine and hyperfine structures and to the Bethe logarithm. |
hep-ph/0405225 | Petr Zavada | A.V. Efremov, O.V. Teryaev, Petr Zavada | Transversity and intrinsic motion of the constituents | 10 pages, 4 figures, Latex & PostScript files. This version will
appear in Phys.Rev.D | Phys.Rev. D70 (2004) 054018 | 10.1103/PhysRevD.70.054018 | null | hep-ph | null | The probabilistic model of parton distributions, previously developed by one
of the authors, is generalized to include the transversity distribution. When
interference effects are attributed to quark level only, the intrinsic quark
motion produces the transversity, which is about twice as large as the usual
polarized distribution. The applicability of such a picture is considered and
possible corrections, accounting for interference effects at the parton-hadron
transition stage are discussed.
| [
{
"created": "Mon, 24 May 2004 08:48:38 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Aug 2004 11:59:25 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Efremov",
"A. V.",
""
],
[
"Teryaev",
"O. V.",
""
],
[
"Zavada",
"Petr",
""
]
] | The probabilistic model of parton distributions, previously developed by one of the authors, is generalized to include the transversity distribution. When interference effects are attributed to quark level only, the intrinsic quark motion produces the transversity, which is about twice as large as the usual polarized distribution. The applicability of such a picture is considered and possible corrections, accounting for interference effects at the parton-hadron transition stage are discussed. |
2011.00921 | Yuji Shi | Yu-Ji Shi, Chien-Yeah Seng, Feng-Kun Guo, Bastian Kubis, Ulf-G.
Mei{\ss}ner and Wei Wang | Two-Meson Form Factors in Unitarized Chiral Perturbation Theory | 53 pages, 21 figures, 3 tables | null | 10.1007/JHEP04(2021)086 | null | hep-ph hep-ex nucl-th | http://creativecommons.org/licenses/by/4.0/ | We present a comprehensive analysis of form factors for two light
pseudoscalar mesons induced by scalar, vector, and tensor quark operators. The
theoretical framework is based on a combination of unitarized chiral
perturbation theory and dispersion relations. The low-energy constants in
chiral perturbation theory are fixed by a global fit to the available data of
the two-meson scattering phase shifts. Each form factor derived from unitarized
chiral perturbation theory is improved by iteratively applying a dispersion
relation. This study updates the existing results in the literature and
explores those that have not been systematically studied previously, in
particular the two-meson tensor form factors within unitarized chiral
perturbation theory. We also discuss the applications of these form factors as
mandatory inputs for low-energy phenomena, such as the semi-leptonic decays
$B_s\to \pi^+\pi^-\ell^+\ell^-$ and the $\tau$ lepton decay
$\tau\rightarrow\pi^{-}\pi^{0}\nu_{\tau}$, in searches for physics beyond the
Standard Model.
| [
{
"created": "Mon, 2 Nov 2020 12:04:36 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Apr 2021 03:47:29 GMT",
"version": "v2"
}
] | 2021-04-28 | [
[
"Shi",
"Yu-Ji",
""
],
[
"Seng",
"Chien-Yeah",
""
],
[
"Guo",
"Feng-Kun",
""
],
[
"Kubis",
"Bastian",
""
],
[
"Meißner",
"Ulf-G.",
""
],
[
"Wang",
"Wei",
""
]
] | We present a comprehensive analysis of form factors for two light pseudoscalar mesons induced by scalar, vector, and tensor quark operators. The theoretical framework is based on a combination of unitarized chiral perturbation theory and dispersion relations. The low-energy constants in chiral perturbation theory are fixed by a global fit to the available data of the two-meson scattering phase shifts. Each form factor derived from unitarized chiral perturbation theory is improved by iteratively applying a dispersion relation. This study updates the existing results in the literature and explores those that have not been systematically studied previously, in particular the two-meson tensor form factors within unitarized chiral perturbation theory. We also discuss the applications of these form factors as mandatory inputs for low-energy phenomena, such as the semi-leptonic decays $B_s\to \pi^+\pi^-\ell^+\ell^-$ and the $\tau$ lepton decay $\tau\rightarrow\pi^{-}\pi^{0}\nu_{\tau}$, in searches for physics beyond the Standard Model. |
1912.11882 | Roman Pasechnik | Ant\'onio P. Morais, Roman Pasechnik, J. Pedro Rodrigues | What can a heavy $U(1)_{\rm B-L}$ $Z^\prime$ boson do to the muon
$(g-2)_\mu$ anomaly and to a new Higgs boson mass? | 20 pages, 9 figures; discussion extended, an extra figure and
references added, conclusions unchanged; final version | Chin.Phys. C45 (2021) no.1 | 10.1088/1674-1137/abc16a | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The minimal $U(1)_{\rm B-L}$ extension of the Standard Model (B-L-SM) offers
an explanation for neutrino mass generation via a seesaw mechanism as well as
contains two new physics states such as an extra Higgs boson and a new
$Z^\prime$ gauge boson. The emergence of a second Higgs particle as well as a
new $Z^\prime$ gauge boson, both linked to the breaking of a local $U(1)_{\rm
B-L}$ symmetry, makes the B-L-SM rather constrained by direct searches at the
Large Hadron Collider (LHC) experiments. We investigate the phenomenological
status of the B-L-SM by confronting the new physics predictions with the LHC
and electroweak precision data. Taking into account the current bounds from
direct LHC searches, we demonstrate that the prediction for the muon
$(g-2)_\mu$ anomaly in the B-L-SM yields at most a contribution of
approximately $8.9 \times 10^{-12}$ which represents a tension of $3.28$
standard deviations, with the current $1\sigma$ uncertainty, by means of a
$Z^\prime$ boson if its mass lies in a range of $6.3$ to $6.5$ TeV, within the
reach of future LHC runs. This means that the B-L-SM, with heavy yet allowed
$Z^\prime$ boson mass range, in practice does not resolve the tension between
the observed anomaly in the muon $(g-2)_\mu$ and the theoretical prediction in
the Standard Model. Such a heavy $Z^\prime$ boson also implies that the minimal
value for a new Higgs mass is of the order of 400 GeV.
| [
{
"created": "Thu, 26 Dec 2019 15:18:21 GMT",
"version": "v1"
},
{
"created": "Sat, 15 Feb 2020 23:43:38 GMT",
"version": "v2"
},
{
"created": "Fri, 10 Jul 2020 08:50:26 GMT",
"version": "v3"
},
{
"created": "Sun, 25 Oct 2020 14:29:27 GMT",
"version": "v4"
}
] | 2020-10-27 | [
[
"Morais",
"António P.",
""
],
[
"Pasechnik",
"Roman",
""
],
[
"Rodrigues",
"J. Pedro",
""
]
] | The minimal $U(1)_{\rm B-L}$ extension of the Standard Model (B-L-SM) offers an explanation for neutrino mass generation via a seesaw mechanism as well as contains two new physics states such as an extra Higgs boson and a new $Z^\prime$ gauge boson. The emergence of a second Higgs particle as well as a new $Z^\prime$ gauge boson, both linked to the breaking of a local $U(1)_{\rm B-L}$ symmetry, makes the B-L-SM rather constrained by direct searches at the Large Hadron Collider (LHC) experiments. We investigate the phenomenological status of the B-L-SM by confronting the new physics predictions with the LHC and electroweak precision data. Taking into account the current bounds from direct LHC searches, we demonstrate that the prediction for the muon $(g-2)_\mu$ anomaly in the B-L-SM yields at most a contribution of approximately $8.9 \times 10^{-12}$ which represents a tension of $3.28$ standard deviations, with the current $1\sigma$ uncertainty, by means of a $Z^\prime$ boson if its mass lies in a range of $6.3$ to $6.5$ TeV, within the reach of future LHC runs. This means that the B-L-SM, with heavy yet allowed $Z^\prime$ boson mass range, in practice does not resolve the tension between the observed anomaly in the muon $(g-2)_\mu$ and the theoretical prediction in the Standard Model. Such a heavy $Z^\prime$ boson also implies that the minimal value for a new Higgs mass is of the order of 400 GeV. |
hep-ph/0005109 | Pran Nath | Utpal Chattopadhyay, Tarek Ibrahim and Pran Nath | CP Violation and Dark Matter | Based on an invited talk at the conference "Sources and Detection of
Dark Matter in the Universe", at Marina del Rey, CA, Feb. 23-25, 2000; 12
pages, Latex including 2 figures | null | null | null | hep-ph | null | A brief review is given of the effects of CP violation on the direct
detection of neutralinos in dark matter detectors. We first summarize the
current developments using the cancellation mechanism which allows for the
existence of large CP violating phases consistent with experimental limits on
the electron and on the neutron electric dipole moments in a broad class of
SUSY, string and D brane models. We then discuss their effects on the
scattering of neutralinos from quarks and on the event rates. It is found that
while CP effects on the event rates can be enormous such effects are reduced
significantly with the imposition of the EDM constraints. However, even with
the inclusion of the EDM constraints the effects are still very significant and
should be included in a precision prediction of event rates in any SUSY, string
or D brane model.
| [
{
"created": "Thu, 11 May 2000 15:06:45 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Chattopadhyay",
"Utpal",
""
],
[
"Ibrahim",
"Tarek",
""
],
[
"Nath",
"Pran",
""
]
] | A brief review is given of the effects of CP violation on the direct detection of neutralinos in dark matter detectors. We first summarize the current developments using the cancellation mechanism which allows for the existence of large CP violating phases consistent with experimental limits on the electron and on the neutron electric dipole moments in a broad class of SUSY, string and D brane models. We then discuss their effects on the scattering of neutralinos from quarks and on the event rates. It is found that while CP effects on the event rates can be enormous such effects are reduced significantly with the imposition of the EDM constraints. However, even with the inclusion of the EDM constraints the effects are still very significant and should be included in a precision prediction of event rates in any SUSY, string or D brane model. |
1101.0260 | Jean-Paul Blaizot | Jean-Paul Blaizot | The Status of Parton Saturation and the CGC | Summary talk of the workshop "Saturation, the Color Glass Condensate
and Glasma: What Have we Learned from RHIC?", BNL, May 2010. To be published
in Nucl. Phys. A | null | 10.1016/j.nuclphysa.2010.12.014 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This is a personal summary of the meeting "Saturation, the Color Glass
Condensate and Glasma: What Have we Learned from RHIC?" that took place at BNL
in May 2010. The purpose of the meeting was to discuss the status of high
density QCD and parton saturation, and to review the progress that RHIC has
allowed in the field.
| [
{
"created": "Fri, 31 Dec 2010 14:28:53 GMT",
"version": "v1"
}
] | 2015-05-20 | [
[
"Blaizot",
"Jean-Paul",
""
]
] | This is a personal summary of the meeting "Saturation, the Color Glass Condensate and Glasma: What Have we Learned from RHIC?" that took place at BNL in May 2010. The purpose of the meeting was to discuss the status of high density QCD and parton saturation, and to review the progress that RHIC has allowed in the field. |
hep-ph/0504025 | Michele Gallinaro | Michele Gallinaro (for the CDF collaboration) | Exclusive Dijet production from CDF2LHC | 9 pages, 10 figures | null | null | null | hep-ph | null | Exclusive dijet production at the Tevatron can be used as a benchmark to
establish predictions on exclusive diffractive Higgs production, a process with
a much smaller cross section. Exclusive dijet production in Double Pomeron
Exchange processes, including diffractive Higgs production with measurements at
the Tevatron and predictions for the Large Hadron Collider are presented. Using
new data from the Tevatron and dedicated diffractive triggers, no excess over a
smooth falling distribution for exclusive dijet events could be found. Upper
limits on the exclusive dijet production cross section are presented and
compared to current theoretical predictions.
| [
{
"created": "Tue, 5 Apr 2005 15:45:50 GMT",
"version": "v1"
}
] | 2019-08-14 | [
[
"Gallinaro",
"Michele",
"",
"for the CDF collaboration"
]
] | Exclusive dijet production at the Tevatron can be used as a benchmark to establish predictions on exclusive diffractive Higgs production, a process with a much smaller cross section. Exclusive dijet production in Double Pomeron Exchange processes, including diffractive Higgs production with measurements at the Tevatron and predictions for the Large Hadron Collider are presented. Using new data from the Tevatron and dedicated diffractive triggers, no excess over a smooth falling distribution for exclusive dijet events could be found. Upper limits on the exclusive dijet production cross section are presented and compared to current theoretical predictions. |
hep-ph/0310095 | Meng Hsiu Wu | Meng-Hsiu Wu, Wei-Min Zhang | Chiral Symmetry in Light-front QCD | 15 pages, no figure, JHEP style, added reference and corrected typos
and some changed content | JHEP 0404 (2004) 045 | 10.1088/1126-6708/2004/04/045 | null | hep-ph | null | The definition of chiral transformations in light-front field theory is very
different from the conventional form in equal-time formalism. We study the
consistency of chiral transformations and chiral symmetry in light-front QCD
and derive a complete new light-front axial-vector current for QCD. The
breaking of chiral symmetry in light-front QCD is only associated with helicity
flip interaction between quarks and gluons. Remarkably, the new axial-vector
current does not contain the pion pole part so that the associate chiral charge
smoothly describes pion transitions for various hadronic processes.
| [
{
"created": "Wed, 8 Oct 2003 03:39:43 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Dec 2003 06:36:46 GMT",
"version": "v2"
},
{
"created": "Fri, 30 Jan 2004 08:06:34 GMT",
"version": "v3"
},
{
"created": "Wed, 28 Apr 2004 03:05:24 GMT",
"version": "v4"
}
] | 2009-11-10 | [
[
"Wu",
"Meng-Hsiu",
""
],
[
"Zhang",
"Wei-Min",
""
]
] | The definition of chiral transformations in light-front field theory is very different from the conventional form in equal-time formalism. We study the consistency of chiral transformations and chiral symmetry in light-front QCD and derive a complete new light-front axial-vector current for QCD. The breaking of chiral symmetry in light-front QCD is only associated with helicity flip interaction between quarks and gluons. Remarkably, the new axial-vector current does not contain the pion pole part so that the associate chiral charge smoothly describes pion transitions for various hadronic processes. |
0708.0163 | Gergely G\'abor Barnaf\"oldi | V. Gogokhia, G.G. Barnafoldi | Vacuum Energy Density in the Quantum Yang - Mills Theory | 28 pages and 4 figures, typos corrected, added new appendices and new
references in comparison with the published version | J.Phys.G37:025003,2010 | 10.1088/0954-3899/37/2/025003 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using the effective potential approach for composite operators, we have
formulated a general method of calculation of the truly non-perturbative
Yang-Mills vacuum energy density (this is, by definition, the Bag constant
apart from the sign). It is the main dynamical characteristic of the QCD ground
state. Our method allows one to make it free of the perturbative contributions
('contaminations'), by construction. We also perform an actual numerical
calculation of the Bag constant for the confining effective charge. Its choice
uniquely defines the Bag constant, which becomes free of all the types of the
perturbative contributions now, as well as possessing many other desirable
properties as colorless, gauge independence, etc. Using further the trace
anomaly relation, we develop a general formalism which makes it possible to
relate the Bag constant to the gluon condensate not using the weak coupling
solution for the corresponding $\beta$ function. Our numerical result for the
Bag constant shows a good agreement with other phenomenological estimates of
the gluon condensate.
| [
{
"created": "Wed, 1 Aug 2007 14:24:33 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Sep 2007 21:14:42 GMT",
"version": "v2"
},
{
"created": "Wed, 24 Oct 2007 02:50:34 GMT",
"version": "v3"
},
{
"created": "Fri, 28 Dec 2007 22:57:45 GMT",
"version": "v4"
},
{
"created": "Sun, 9 Aug 2009 23:12:52 GMT",
"version": "v5"
},
{
"created": "Tue, 19 Jan 2010 12:44:24 GMT",
"version": "v6"
}
] | 2010-01-21 | [
[
"Gogokhia",
"V.",
""
],
[
"Barnafoldi",
"G. G.",
""
]
] | Using the effective potential approach for composite operators, we have formulated a general method of calculation of the truly non-perturbative Yang-Mills vacuum energy density (this is, by definition, the Bag constant apart from the sign). It is the main dynamical characteristic of the QCD ground state. Our method allows one to make it free of the perturbative contributions ('contaminations'), by construction. We also perform an actual numerical calculation of the Bag constant for the confining effective charge. Its choice uniquely defines the Bag constant, which becomes free of all the types of the perturbative contributions now, as well as possessing many other desirable properties as colorless, gauge independence, etc. Using further the trace anomaly relation, we develop a general formalism which makes it possible to relate the Bag constant to the gluon condensate not using the weak coupling solution for the corresponding $\beta$ function. Our numerical result for the Bag constant shows a good agreement with other phenomenological estimates of the gluon condensate. |
2110.00588 | Bowen Fu | Bowen Fu, Stephen F. King | Spontaneously stabilised dark matter from a fermiophobic $U(1)'$ gauge
symmetry | 19 pages, 5 figures, 2 tables | null | 10.1007/JHEP12(2021)121 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the possibility that dark matter is stabilised by a discrete
$Z_2$ symmetry which arises from a subgroup of a $U(1)'$ gauge symmetry,
spontaneously broken by integer charged scalars, and under which the chiral
quarks and leptons do not carry any charges. A chiral fermion $\chi$ with
half-integer charge is odd under the preserved $Z_2$, and hence becomes a
stable dark matter candidate, being produced through couplings to right-handed
neutrinos with vector-like $U(1)'$ charges, as in the type Ib seesaw mechanism.
We calculate the relic abundance in such a low energy effective seesaw model
containing few parameters, then consider a high energy renormalisable model
with a complete fourth family of vector-like fermions, where the chiral quark
and lepton masses arise from a seesaw-like mechanism. With the inclusion of the
fourth family, the lightest vector-like quark can contribute to the dark matter
production, enlarging the allowed parameter space that we explore.
| [
{
"created": "Fri, 1 Oct 2021 18:00:03 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Dec 2021 08:03:56 GMT",
"version": "v2"
}
] | 2022-01-05 | [
[
"Fu",
"Bowen",
""
],
[
"King",
"Stephen F.",
""
]
] | We consider the possibility that dark matter is stabilised by a discrete $Z_2$ symmetry which arises from a subgroup of a $U(1)'$ gauge symmetry, spontaneously broken by integer charged scalars, and under which the chiral quarks and leptons do not carry any charges. A chiral fermion $\chi$ with half-integer charge is odd under the preserved $Z_2$, and hence becomes a stable dark matter candidate, being produced through couplings to right-handed neutrinos with vector-like $U(1)'$ charges, as in the type Ib seesaw mechanism. We calculate the relic abundance in such a low energy effective seesaw model containing few parameters, then consider a high energy renormalisable model with a complete fourth family of vector-like fermions, where the chiral quark and lepton masses arise from a seesaw-like mechanism. With the inclusion of the fourth family, the lightest vector-like quark can contribute to the dark matter production, enlarging the allowed parameter space that we explore. |
2010.14504 | Andreas Crivellin | Andreas Crivellin, Claudio Andrea Manzari, Marcel Alguero, Joaquim
Matias | Combined Explanation of the $Z\to b\bar b$ Forward-Backward Asymmetry,
the Cabibbo Angle Anomaly, $\tau\to\mu\nu\nu$ and $b\to s\ell^+\ell^-$ Data | 8 pages, 2 figures, version accepted for publication in PRL | Phys. Rev. Lett. 127, 011801 (2021) | 10.1103/PhysRevLett.127.011801 | CERN-TH-2020-177, PSI-PR-20-18, UZ-TH 40/20 | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article we propose a simple model which can provide a combined
explanation of the $Z\to b\bar b$ forward-backward asymmetry, the Cabibbo Angle
Anomaly (CAA), $\tau\to\mu\nu\nu$ and $b\to s\ell^+\ell^-$ data. This model is
obtained by extending the Standard Model (SM) by two heavy vector-like quarks
(an $SU(2)_L$ doublet (singlet) with hypercharge $-5/6$ (-1/3)), two new
scalars (a neutral and a singly charged one) and a gauged $L_\mu-L_\tau$
symmetry. The mixing of the new quarks with the SM ones, after electroweak
symmetry breaking, does not only explain $Z\to b\bar b$ data but also generates
a lepton flavour universal contribution to $b\to s\ell^+\ell^-$ transitions.
Together with the lepton flavour universality violating effect, generated by
loop-induced $Z^\prime$ penguins involving the charged scalar and the heavy
quarks, it gives an excellent fit to data ($6.1\,\sigma$ better than the SM).
Furthermore, the charged scalar (neutral vector) gives a necessarily
constructive tree-level (loop) effect in $\mu\to e\nu\nu$ ($\tau\to
\mu\nu\nu$), which can naturally account for the CAA (${\rm
Br}[\tau\to\mu\nu\nu]/{\rm Br}[\tau\to e\nu\nu]$ and ${\rm
Br}[\tau\to\mu\nu\nu]/{\rm Br}[\mu\to e\nu\nu]$).
| [
{
"created": "Tue, 27 Oct 2020 17:59:59 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Jun 2021 17:07:17 GMT",
"version": "v2"
}
] | 2021-07-07 | [
[
"Crivellin",
"Andreas",
""
],
[
"Manzari",
"Claudio Andrea",
""
],
[
"Alguero",
"Marcel",
""
],
[
"Matias",
"Joaquim",
""
]
] | In this article we propose a simple model which can provide a combined explanation of the $Z\to b\bar b$ forward-backward asymmetry, the Cabibbo Angle Anomaly (CAA), $\tau\to\mu\nu\nu$ and $b\to s\ell^+\ell^-$ data. This model is obtained by extending the Standard Model (SM) by two heavy vector-like quarks (an $SU(2)_L$ doublet (singlet) with hypercharge $-5/6$ (-1/3)), two new scalars (a neutral and a singly charged one) and a gauged $L_\mu-L_\tau$ symmetry. The mixing of the new quarks with the SM ones, after electroweak symmetry breaking, does not only explain $Z\to b\bar b$ data but also generates a lepton flavour universal contribution to $b\to s\ell^+\ell^-$ transitions. Together with the lepton flavour universality violating effect, generated by loop-induced $Z^\prime$ penguins involving the charged scalar and the heavy quarks, it gives an excellent fit to data ($6.1\,\sigma$ better than the SM). Furthermore, the charged scalar (neutral vector) gives a necessarily constructive tree-level (loop) effect in $\mu\to e\nu\nu$ ($\tau\to \mu\nu\nu$), which can naturally account for the CAA (${\rm Br}[\tau\to\mu\nu\nu]/{\rm Br}[\tau\to e\nu\nu]$ and ${\rm Br}[\tau\to\mu\nu\nu]/{\rm Br}[\mu\to e\nu\nu]$). |
1308.5075 | Holger Gies | Holger Gies, Clemens Gneiting, Ren\'e Sondenheimer | Higgs Mass Bounds from Renormalization Flow for a simple Yukawa model | 12 pages, 6 figures | Phys. Rev. D 89, 045012 (2014) | 10.1103/PhysRevD.89.045012 | null | hep-ph hep-lat hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the functional renormalization group flow of a Higgs-Yukawa toy
model mimicking the top-Higgs sector of the standard model. This approach
allows for treating arbitrary bare couplings. For the class of standard bare
potentials of \phi^4-type at a given ultraviolet cut-off, we show that a finite
infrared Higgs mass range emerges naturally from the renormalization group flow
itself. Higgs masses outside the resulting bounds cannot be connected to any
conceivable set of bare parameters in this standard-model \phi^4 class. By
contrast, more general bare potentials allow to diminish the lower bound
considerably. We identify a simple renormalization group mechanism for this
depletion of the lower bound. If active also in the full standard model, Higgs
masses smaller than the conventional infrared window do not necessarily require
new physics at low scales or give rise to instability problems.
| [
{
"created": "Fri, 23 Aug 2013 09:24:13 GMT",
"version": "v1"
}
] | 2014-02-26 | [
[
"Gies",
"Holger",
""
],
[
"Gneiting",
"Clemens",
""
],
[
"Sondenheimer",
"René",
""
]
] | We study the functional renormalization group flow of a Higgs-Yukawa toy model mimicking the top-Higgs sector of the standard model. This approach allows for treating arbitrary bare couplings. For the class of standard bare potentials of \phi^4-type at a given ultraviolet cut-off, we show that a finite infrared Higgs mass range emerges naturally from the renormalization group flow itself. Higgs masses outside the resulting bounds cannot be connected to any conceivable set of bare parameters in this standard-model \phi^4 class. By contrast, more general bare potentials allow to diminish the lower bound considerably. We identify a simple renormalization group mechanism for this depletion of the lower bound. If active also in the full standard model, Higgs masses smaller than the conventional infrared window do not necessarily require new physics at low scales or give rise to instability problems. |
1602.01317 | Massimo Mannarelli | Stefano Carignano, Andrea Mammarella and Massimo Mannarelli | Equation of state of imbalanced cold matter from chiral perturbation
theory | 5 pages, 3 figures, minor changes. Accepted version as Rapid
Communication on PRD | Phys. Rev. D 93, 051503 (2016) | 10.1103/PhysRevD.93.051503 | null | hep-ph astro-ph.HE cond-mat.quant-gas hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the thermodynamic properties of matter at vanishing temperature for
non-extreme values of the isospin chemical potential and of the strange quark
chemical potential. From the leading order pressure obtained by maximizing the
static chiral Lagrangian density we derive a simple expression for the equation
of state in the pion condensed phase and in the kaon condensed phase. We find
an analytical expression for the maximum of the ratio between the energy
density and the Stefan-Boltzmann energy density as well as for the isospin
chemical potential at the peak both in good agreement with lattice simulations
of quantum chromodynamics. We speculate on the location of the crossover from
the Bose-Einstein condensate state to the Bardeen-Cooper-Schrieffer state by a
simple analysis of the thermodynamic properties of the system. For $\mu_I
\gtrsim 2 m_\pi$ the leading order chiral perturbation theory breaks down; as
an example it underestimates the energy density of the system and leads to a
wrong asymptotic behavior.
| [
{
"created": "Wed, 3 Feb 2016 14:39:01 GMT",
"version": "v1"
},
{
"created": "Sat, 2 Apr 2016 07:11:16 GMT",
"version": "v2"
}
] | 2016-04-06 | [
[
"Carignano",
"Stefano",
""
],
[
"Mammarella",
"Andrea",
""
],
[
"Mannarelli",
"Massimo",
""
]
] | We study the thermodynamic properties of matter at vanishing temperature for non-extreme values of the isospin chemical potential and of the strange quark chemical potential. From the leading order pressure obtained by maximizing the static chiral Lagrangian density we derive a simple expression for the equation of state in the pion condensed phase and in the kaon condensed phase. We find an analytical expression for the maximum of the ratio between the energy density and the Stefan-Boltzmann energy density as well as for the isospin chemical potential at the peak both in good agreement with lattice simulations of quantum chromodynamics. We speculate on the location of the crossover from the Bose-Einstein condensate state to the Bardeen-Cooper-Schrieffer state by a simple analysis of the thermodynamic properties of the system. For $\mu_I \gtrsim 2 m_\pi$ the leading order chiral perturbation theory breaks down; as an example it underestimates the energy density of the system and leads to a wrong asymptotic behavior. |
hep-ph/9612355 | Glennys Farrar | Glennys R. Farrar (Rutgers Univ.) | Phenomenology of ``inos'' in the Light Gaugino Scenario and Possible
Evidence for a $\sim 53$ GeV Chargino | Invited talk at ICHEP96, Warsaw, July, 1996. Based on contributed
paper pa11-048 and RU-96-71 (hep-ph/9608387) | null | null | RU-96-93 | hep-ph | null | The tree-level-massless gaugino scenario predicts that the lighter chargino
mass is less than m_W and that gluino and lightest neutralino masses are $\lsi
1$ GeV. In this case the dominant decay mode of charginos and non-LSP
neutralinos is generically to three jets. The excess of "4j" events with total
invariant mass $\sim 105$ GeV observed in LEP running at 130-136 GeV is noted
to be consistent with pair production of $\sim 53$ GeV charginos. Data at 161
and 172 GeV from Fall, 1996, cannot conclusively test this hypothesis (because
cuts to eliminate $W^+W^-$ background reduce the efficiency significantly) but
is suggestive that the signal persists.
| [
{
"created": "Fri, 13 Dec 1996 18:25:56 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Farrar",
"Glennys R.",
"",
"Rutgers Univ."
]
] | The tree-level-massless gaugino scenario predicts that the lighter chargino mass is less than m_W and that gluino and lightest neutralino masses are $\lsi 1$ GeV. In this case the dominant decay mode of charginos and non-LSP neutralinos is generically to three jets. The excess of "4j" events with total invariant mass $\sim 105$ GeV observed in LEP running at 130-136 GeV is noted to be consistent with pair production of $\sim 53$ GeV charginos. Data at 161 and 172 GeV from Fall, 1996, cannot conclusively test this hypothesis (because cuts to eliminate $W^+W^-$ background reduce the efficiency significantly) but is suggestive that the signal persists. |
hep-ph/0609260 | Christopher McMullen | A.W. McDavid and C.D. McMullen | Generalizing Cross Products and Maxwell's Equations to Universal Extra
Dimensions | 26 pages, 1 figure, submitted as a PDF file (PostScript may be
unavailable), revised abstract, introduction, and conclusions, briefly
discuss differential forms, added references | null | null | null | hep-ph | null | In the past five years, there has been considerable research on the collider
phenomenology of TeV-scale extra compact dimensions which are universal - i.e.
accessible to all the Standard Model fields. We consider in detail a
fundamental conceptual issue in the higher-dimensional theory: Since the cross
product is only physically meaningful in three spatial dimensions, how do
traditional vector formulas involving the cross product or curl operation
generalize in the case of universal extra dimensions? For example, is angular
momentum physically meaningful, and, if so, how is it related to the position
and momentum vectors? We find that if angular velocity, torque, angular
momentum, and magnetic field, for example, are regarded as anti-symmetric
second-rank tensors instead of pseudovectors, we can construct tensor forms of
the standard cross product and curl equations that do generalize to higher
dimensions. Although Maxwell's equations have been generalized to extra
dimensions in terms of differential forms, we show that our simple technique
casts the generalized Maxwell's equations in a form very similar to the
standard vector calculus. We also provide direct integrals for the fields in a
practical tensor calculus form. We explore the electric and magnetic fields in
detail to show that there are no fundamental conceptual problems hidden in the
theory - e.g. how the Lorentz force can be meaningfully expressed in terms of
the velocity and magnetic field when the traditional cross product and
right-hand rule do not apply. Finally, we explore the effects that
compactification has on the effective form of Maxwell's equations, which could
be useful for direct tests of Coulomb's law.
| [
{
"created": "Tue, 26 Sep 2006 02:18:46 GMT",
"version": "v1"
},
{
"created": "Sun, 1 Oct 2006 15:12:12 GMT",
"version": "v2"
},
{
"created": "Mon, 9 Oct 2006 15:53:26 GMT",
"version": "v3"
},
{
"created": "Mon, 30 Oct 2006 20:27:07 GMT",
"version": "v4"
}
] | 2007-05-23 | [
[
"McDavid",
"A. W.",
""
],
[
"McMullen",
"C. D.",
""
]
] | In the past five years, there has been considerable research on the collider phenomenology of TeV-scale extra compact dimensions which are universal - i.e. accessible to all the Standard Model fields. We consider in detail a fundamental conceptual issue in the higher-dimensional theory: Since the cross product is only physically meaningful in three spatial dimensions, how do traditional vector formulas involving the cross product or curl operation generalize in the case of universal extra dimensions? For example, is angular momentum physically meaningful, and, if so, how is it related to the position and momentum vectors? We find that if angular velocity, torque, angular momentum, and magnetic field, for example, are regarded as anti-symmetric second-rank tensors instead of pseudovectors, we can construct tensor forms of the standard cross product and curl equations that do generalize to higher dimensions. Although Maxwell's equations have been generalized to extra dimensions in terms of differential forms, we show that our simple technique casts the generalized Maxwell's equations in a form very similar to the standard vector calculus. We also provide direct integrals for the fields in a practical tensor calculus form. We explore the electric and magnetic fields in detail to show that there are no fundamental conceptual problems hidden in the theory - e.g. how the Lorentz force can be meaningfully expressed in terms of the velocity and magnetic field when the traditional cross product and right-hand rule do not apply. Finally, we explore the effects that compactification has on the effective form of Maxwell's equations, which could be useful for direct tests of Coulomb's law. |
hep-ph/9707321 | Robert Harlander | J.H. Kuehn | Theory of Top Quark Production and Decay | LaTeX, 114 pages, missing figures available upon request. Lectures
presented at the XXIII SLAC Summer Institute on Particle Physics, "The Top
Quark and the Electroweak Interaction", July 10-21, 1995, SLAC, Stanford, CA.
Published in the proceedings, SLAC-R-494 CONF-9507258-UC-414, pg.1. The
complete paper, is also available via anonymous ftp at
ftp://ttpux2.physik.uni-karlsruhe.de/ , or via www at
http://www-ttp.physik.uni-karlsruhe.de/cgi-bin/preprints/ | null | null | TTP96-18 | hep-ph | null | Direct and indirect information on the top quark mass and its decay modes is
reviewed. The theory of top production in hadron- and
electron-positron-colliders is presented.
| [
{
"created": "Fri, 11 Jul 1997 10:35:18 GMT",
"version": "v1"
}
] | 2009-09-25 | [
[
"Kuehn",
"J. H.",
""
]
] | Direct and indirect information on the top quark mass and its decay modes is reviewed. The theory of top production in hadron- and electron-positron-colliders is presented. |
hep-ph/0301008 | Mannque Rho | Mannque Rho | The Vector Manifestation and Effective Degrees of Freedom At Chiral
Restoration | Based on talks given at "Chiral 02," Kyoto, Japan, 7-9 October 2002
and "SCGT02," Nagoya, Japan, 10-13 December 2002 | Prog.Theor.Phys.Suppl. 149 (2003) 142-151 | 10.1143/PTPS.149.142 | null | hep-ph nucl-th | null | The role of effective degrees of freedom on the vector and axial-vector
susceptibilities and the pion velocity at chiral restoration is analyzed. We
consider two possible scenarios, one in which pions are considered to be the
only low-lying degrees of freedom -- that we shall refer to as "standard" --
and the other in which pions, vector mesons and constituent quarks (or
quasiquarks in short) are the relevant low-lying degrees of freedom -- that we
shall refer to as "vector manifestation (VM)." We show at one-loop order in
chiral perturbation theory with hidden local symmetry Lagrangian that while in
the standard scenario, the pion velocity vanishes at the chiral transition, it
instead approaches unity in the VM scenario. If the VM is realized in nature,
the chiral phase structure of hadronic matter can be much richer than that in
the standard one and the phase transition will be a smooth crossover: Sharp
vector and scalar excitations are expected in the vicinity of the critical
point. Some indirect indications that lend support to the VM scenario, and in
consequence to BR scaling, are discussed.
| [
{
"created": "Fri, 3 Jan 2003 08:23:17 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Rho",
"Mannque",
""
]
] | The role of effective degrees of freedom on the vector and axial-vector susceptibilities and the pion velocity at chiral restoration is analyzed. We consider two possible scenarios, one in which pions are considered to be the only low-lying degrees of freedom -- that we shall refer to as "standard" -- and the other in which pions, vector mesons and constituent quarks (or quasiquarks in short) are the relevant low-lying degrees of freedom -- that we shall refer to as "vector manifestation (VM)." We show at one-loop order in chiral perturbation theory with hidden local symmetry Lagrangian that while in the standard scenario, the pion velocity vanishes at the chiral transition, it instead approaches unity in the VM scenario. If the VM is realized in nature, the chiral phase structure of hadronic matter can be much richer than that in the standard one and the phase transition will be a smooth crossover: Sharp vector and scalar excitations are expected in the vicinity of the critical point. Some indirect indications that lend support to the VM scenario, and in consequence to BR scaling, are discussed. |
2405.14380 | Miguel Angel Benitez-Rathgeb | Miguel A. Benitez-Rathgeb, Andr\'e H. Hoang, Vicent Mateu, Iain W.
Stewart and Gherardo Vita | Determining $\alpha_s(m_Z)$ from Thrust with Power Corrections | 4 pages, 3 figures. Contribution to the 2024 QCD session of the 58th
Rencontres de Moriond | null | null | MIT/CTP-5723, CERN-TH-2024-063, UWThPh 2024-12 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We update and extend a previous N$^3$LL$^\prime$+${\cal O}(\alpha_s^3)$
strong coupling determination from thrust data. In particular, we carry out a
fit with data fully restricted to the dijet region seeking to minimize the
potential impact of power corrections that go beyond dijet configurations. In
addition, we parametrize deviations from the dijet power correction in order to
add an additional source of uncertainty in the result for $\alpha_s(m_Z)$. We
also show that the inclusion of resummation is important to achieve stability
with respect to varying the fit region.
| [
{
"created": "Thu, 23 May 2024 09:55:15 GMT",
"version": "v1"
}
] | 2024-05-24 | [
[
"Benitez-Rathgeb",
"Miguel A.",
""
],
[
"Hoang",
"André H.",
""
],
[
"Mateu",
"Vicent",
""
],
[
"Stewart",
"Iain W.",
""
],
[
"Vita",
"Gherardo",
""
]
] | We update and extend a previous N$^3$LL$^\prime$+${\cal O}(\alpha_s^3)$ strong coupling determination from thrust data. In particular, we carry out a fit with data fully restricted to the dijet region seeking to minimize the potential impact of power corrections that go beyond dijet configurations. In addition, we parametrize deviations from the dijet power correction in order to add an additional source of uncertainty in the result for $\alpha_s(m_Z)$. We also show that the inclusion of resummation is important to achieve stability with respect to varying the fit region. |
1812.06143 | Maxim V. Polyakov | Maxim V. Polyakov, Peter Schweitzer | Mechanical properties of particles | Talk given at 23rd International Spin Physics Symposium - SPIN2018 -
10-14 September, 2018 Ferrara, Italy | null | null | null | hep-ph hep-ex nucl-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Selected topics related to the physics of the energy-momentum tensor (EMT)
form factors are discussed. The topics are: 1) Fundamental mechanical
properties of particles and gravity 2) Mechanical properties of non-spherical
particles 3) Gravitational form factors of Goldstone bosons 4) Nucleon's
seismology?
| [
{
"created": "Fri, 14 Dec 2018 20:02:44 GMT",
"version": "v1"
}
] | 2018-12-18 | [
[
"Polyakov",
"Maxim V.",
""
],
[
"Schweitzer",
"Peter",
""
]
] | Selected topics related to the physics of the energy-momentum tensor (EMT) form factors are discussed. The topics are: 1) Fundamental mechanical properties of particles and gravity 2) Mechanical properties of non-spherical particles 3) Gravitational form factors of Goldstone bosons 4) Nucleon's seismology? |
hep-ph/0503221 | Ivan Vitev | Ivan Vitev | Jet quenching in relativistic heavy ion collisions | Invited plenary talk at the V-th international conference on the
physics and astrophysics of the quark-gluon plasma. 8 pages, 4 figures | null | 10.1088/1742-6596/50/1/014 | null | hep-ph | null | Parton propagation in dense nuclear matter results in elastic, inelastic and
coherent multiple soft scattering with the in-medium color charges. Such
scattering leads to calculable modifications of the hadron production cross
section that is evaluated in the framework of the perturbative QCD
factorization approach. Final state medium-induced gluon bremsstrahlung is
arguably the most efficient way of suppressing large transverse momentum
particle production in nucleus-nucleus collisions. The observed hadronic
attenuation, known as jet quenching, can be related to the properties of the
medium, such as density and temperature, and carries valuable information about
the early stages of heavy ion reactions. Non-Abelian energy loss in the
quark-gluon plasma can be studied in much greater detail through the
modification of the two particle back-to-back correlations. Perturbative
calculations give good description of the redistribution of the lost energy in
lower transverse momentum particles and predict significant increase of the
correlation width of away-side di-hadrons. In contrast, energy loss in cold
nuclear matter was found to be small but for large values of Feynman-x is
expected to complement the dynamical higher twist shadowing in experimentally
observable forward rapidity hadron suppression.
| [
{
"created": "Tue, 22 Mar 2005 18:26:30 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Vitev",
"Ivan",
""
]
] | Parton propagation in dense nuclear matter results in elastic, inelastic and coherent multiple soft scattering with the in-medium color charges. Such scattering leads to calculable modifications of the hadron production cross section that is evaluated in the framework of the perturbative QCD factorization approach. Final state medium-induced gluon bremsstrahlung is arguably the most efficient way of suppressing large transverse momentum particle production in nucleus-nucleus collisions. The observed hadronic attenuation, known as jet quenching, can be related to the properties of the medium, such as density and temperature, and carries valuable information about the early stages of heavy ion reactions. Non-Abelian energy loss in the quark-gluon plasma can be studied in much greater detail through the modification of the two particle back-to-back correlations. Perturbative calculations give good description of the redistribution of the lost energy in lower transverse momentum particles and predict significant increase of the correlation width of away-side di-hadrons. In contrast, energy loss in cold nuclear matter was found to be small but for large values of Feynman-x is expected to complement the dynamical higher twist shadowing in experimentally observable forward rapidity hadron suppression. |
1209.0336 | Javier L. Albacete | Javier L. Albacete | Testing the CGC in proton-lead collisions at the LHC | 8 pages. Contribution to the proceedings of the Hard Probes 2012
Conference (27-May 1-June 2012. Cagliari, Sardinia, Italy) | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I present a brief review of present CGC phenomenological applications and of
the physics prospects for the forthcoming proton-lead run at the LHC
| [
{
"created": "Mon, 3 Sep 2012 13:14:32 GMT",
"version": "v1"
}
] | 2012-09-04 | [
[
"Albacete",
"Javier L.",
""
]
] | I present a brief review of present CGC phenomenological applications and of the physics prospects for the forthcoming proton-lead run at the LHC |
2212.02433 | Tsz Hong Kwok | Tin Seng Manfred Ho, Xu-Hui Jiang, Tsz Hong Kwok, Lingfeng Li, Tao Liu | Testing Lepton Flavor Universality at Future $Z$ Factories | 63 pages, 27 figures | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | As one of the hypothetical principles in the Standard Model (SM), lepton
flavor universality (LFU) should be tested with a precision as high as possible
such that the physics violating this principle can be fully examined. The run
of $Z$ factory at a future $e^+e^-$ collider such as CEPC or FCC-$ee$ provides
a great opportunity to perform this task because of the large statistics and
high reconstruction efficiencies for $b$-hadrons at $Z$ pole. In this paper, we
present a systematic study on the LFU test in the future $Z$ factories. The
goal is three-fold. Firstly, we study the sensitivities of measuring the
LFU-violating observables of $b\to c \tau \nu$, $i.e.$, $R_{J/\psi}$,
$R_{D_s}$, $R_{D_s^\ast}$ and $R_{\Lambda_c}$, where $\tau$ decays muonically.
For this purpose, we develop the strategies for event reconstruction, based on
the track information significantly. Secondly, we explore the sensitivity
robustness against detector performance and its potential improvement with the
message of event shape or beyond the $b$-hadron decays. A picture is drawn on
the variation of analysis sensitivities with the detector tracking resolution
and soft photon detectability, and the impact of Fox-Wolfram moments is studied
on the measurement of relevant flavor events. Finally, we interpret the
projected sensitivities in the SM effective field theory, by combining the LFU
tests of $b\to c \tau \nu$ and the measurements of $b\to s \tau^+\tau^-$ and
$b\to s \bar{\nu} \nu$. We show that the limits on the LFU-violating energy
scale can be pushed up to $\sim \mathcal{O} (10)$~TeV for $\lesssim \mathcal
O(1)$ Wilson coefficients at Tera-$Z$.
| [
{
"created": "Mon, 5 Dec 2022 17:21:04 GMT",
"version": "v1"
}
] | 2022-12-06 | [
[
"Ho",
"Tin Seng Manfred",
""
],
[
"Jiang",
"Xu-Hui",
""
],
[
"Kwok",
"Tsz Hong",
""
],
[
"Li",
"Lingfeng",
""
],
[
"Liu",
"Tao",
""
]
] | As one of the hypothetical principles in the Standard Model (SM), lepton flavor universality (LFU) should be tested with a precision as high as possible such that the physics violating this principle can be fully examined. The run of $Z$ factory at a future $e^+e^-$ collider such as CEPC or FCC-$ee$ provides a great opportunity to perform this task because of the large statistics and high reconstruction efficiencies for $b$-hadrons at $Z$ pole. In this paper, we present a systematic study on the LFU test in the future $Z$ factories. The goal is three-fold. Firstly, we study the sensitivities of measuring the LFU-violating observables of $b\to c \tau \nu$, $i.e.$, $R_{J/\psi}$, $R_{D_s}$, $R_{D_s^\ast}$ and $R_{\Lambda_c}$, where $\tau$ decays muonically. For this purpose, we develop the strategies for event reconstruction, based on the track information significantly. Secondly, we explore the sensitivity robustness against detector performance and its potential improvement with the message of event shape or beyond the $b$-hadron decays. A picture is drawn on the variation of analysis sensitivities with the detector tracking resolution and soft photon detectability, and the impact of Fox-Wolfram moments is studied on the measurement of relevant flavor events. Finally, we interpret the projected sensitivities in the SM effective field theory, by combining the LFU tests of $b\to c \tau \nu$ and the measurements of $b\to s \tau^+\tau^-$ and $b\to s \bar{\nu} \nu$. We show that the limits on the LFU-violating energy scale can be pushed up to $\sim \mathcal{O} (10)$~TeV for $\lesssim \mathcal O(1)$ Wilson coefficients at Tera-$Z$. |
hep-ph/9904451 | Raul Horvat | R. Horvat | Stringent constraint on the scalar-neutrino coupling constant from
quintessential cosmology | 7 pages, MPLA in press, some parts disregarded and a footnote added | Mod.Phys.Lett. A14 (1999) 2245-2252 | 10.1142/S0217732399002327 | IRB-ZEF-99/32 | hep-ph | null | An extremely light ($m_{\phi} \ll 10^{-33} {\rm eV}$), slowly-varying scalar
field $\phi $ (quintessence) with a potential energy density as large as 60% of
the critical density has been proposed as the origin of the accelerated
expansion of the Universe at present. The interaction of this smoothly
distributed component with another predominately smooth component, the cosmic
neutrino background, is studied. The slow-roll approximation for generic $\phi
$ potentials may then be used to obtain a limit on the scalar-neutrino coupling
constant, found to be many orders of magnitude more stringent than the limits
set by observations of neutrinos from SN 1987A. In addition, if quintessential
theory allows for a violation of the equivalence principle in the sector of
neutrinos, the current solar neutrino data can probe such a violation at the
10^{-10} level.
| [
{
"created": "Mon, 26 Apr 1999 08:56:38 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Jun 1999 09:20:40 GMT",
"version": "v2"
},
{
"created": "Wed, 13 Oct 1999 08:57:29 GMT",
"version": "v3"
}
] | 2009-10-31 | [
[
"Horvat",
"R.",
""
]
] | An extremely light ($m_{\phi} \ll 10^{-33} {\rm eV}$), slowly-varying scalar field $\phi $ (quintessence) with a potential energy density as large as 60% of the critical density has been proposed as the origin of the accelerated expansion of the Universe at present. The interaction of this smoothly distributed component with another predominately smooth component, the cosmic neutrino background, is studied. The slow-roll approximation for generic $\phi $ potentials may then be used to obtain a limit on the scalar-neutrino coupling constant, found to be many orders of magnitude more stringent than the limits set by observations of neutrinos from SN 1987A. In addition, if quintessential theory allows for a violation of the equivalence principle in the sector of neutrinos, the current solar neutrino data can probe such a violation at the 10^{-10} level. |
1801.03505 | Yue Zhang | Patrick J. Fox, Ian Low, Yue Zhang | Top-philic $Z'$ Forces at the LHC | 30 pages, 12 figures | null | 10.1007/JHEP03(2018)074 | FERMILAB-PUB-18-005-T, NUHEP-TH/18-01 | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | Despite extensive searches for an additional neutral massive gauge boson at
the LHC, a $Z^\prime$ at the weak scale could still be present if its couplings
to the first two generations of quarks are suppressed, in which case the
production in hadron colliders relies on tree-level processes in association
with heavy flavors or one-loop processes in association with a jet. We consider
the low-energy effective theory of a top-philic $Z'$ and present possible UV
completions. We clarify theoretical subtleties in evaluating the production of
a top-philic $Z'$ at the LHC and examine carefully the treatment of an
anomalous $Z'$ current in the low-energy effective theory. Recipes for properly
computing the production rate in the $Z'+j$ channel are given. We discuss
constraints from colliders and low-energy probes of new physics. As an
application, we apply these considerations to models that use a weak-scale $Z'$
to explain possible violations of lepton universality in $B$ meson decays, and
show that the future running of a high luminosity LHC can potentially cover
much of the remaining parameter space favored by this particular interpretation
of the $B$ physics anomaly.
| [
{
"created": "Wed, 10 Jan 2018 19:00:05 GMT",
"version": "v1"
}
] | 2018-04-18 | [
[
"Fox",
"Patrick J.",
""
],
[
"Low",
"Ian",
""
],
[
"Zhang",
"Yue",
""
]
] | Despite extensive searches for an additional neutral massive gauge boson at the LHC, a $Z^\prime$ at the weak scale could still be present if its couplings to the first two generations of quarks are suppressed, in which case the production in hadron colliders relies on tree-level processes in association with heavy flavors or one-loop processes in association with a jet. We consider the low-energy effective theory of a top-philic $Z'$ and present possible UV completions. We clarify theoretical subtleties in evaluating the production of a top-philic $Z'$ at the LHC and examine carefully the treatment of an anomalous $Z'$ current in the low-energy effective theory. Recipes for properly computing the production rate in the $Z'+j$ channel are given. We discuss constraints from colliders and low-energy probes of new physics. As an application, we apply these considerations to models that use a weak-scale $Z'$ to explain possible violations of lepton universality in $B$ meson decays, and show that the future running of a high luminosity LHC can potentially cover much of the remaining parameter space favored by this particular interpretation of the $B$ physics anomaly. |
2005.11526 | Jale Y. S\'ung\'u | J.Y. S\"ung\"u, A. T\"urkan, E. Sertbakan, E. Veli Veliev | Axial-tensor Meson Family at $T\neq0$ | 8 pages, 5 figures | null | 10.1140/epjc/s10052-020-08439-0 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The mass and decay constant of the axial-tensor meson nonets
$\rho_2,~\omega_2$ and a missing member and also their first excited states are
analyzed by the Thermal QCD sum rules model including QCD condensates up to
dimension five. Mass and decay constant values in terms of variations of
temperature are very well stable from $T=0$ up to ~$T \cong 120 ~\mathrm{MeV}$.
However nearly after these threshold, our numerical analysis indicate that they
begin to diminish with increasing temperature. Mass value of these mesons and
their first excited states decrease about $(1-13\%)$ compared to vacuum values
and $(10-26\%)$ for the decay constants according to PDG data and $(9-26\%)$
and $(2-34\%)$ respectively concerning Regge Trajectory Model in the
corresponding Thermal QCD sum rules calculations. The experimental results are
already copious, but expected to grow up at ongoing and future heavy-ion
experimental programs allowing us to compare our results.
| [
{
"created": "Sat, 23 May 2020 12:45:30 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Aug 2020 11:11:16 GMT",
"version": "v2"
}
] | 2020-10-28 | [
[
"Süngü",
"J. Y.",
""
],
[
"Türkan",
"A.",
""
],
[
"Sertbakan",
"E.",
""
],
[
"Veliev",
"E. Veli",
""
]
] | The mass and decay constant of the axial-tensor meson nonets $\rho_2,~\omega_2$ and a missing member and also their first excited states are analyzed by the Thermal QCD sum rules model including QCD condensates up to dimension five. Mass and decay constant values in terms of variations of temperature are very well stable from $T=0$ up to ~$T \cong 120 ~\mathrm{MeV}$. However nearly after these threshold, our numerical analysis indicate that they begin to diminish with increasing temperature. Mass value of these mesons and their first excited states decrease about $(1-13\%)$ compared to vacuum values and $(10-26\%)$ for the decay constants according to PDG data and $(9-26\%)$ and $(2-34\%)$ respectively concerning Regge Trajectory Model in the corresponding Thermal QCD sum rules calculations. The experimental results are already copious, but expected to grow up at ongoing and future heavy-ion experimental programs allowing us to compare our results. |
1210.1330 | Thorsten Renk | Thorsten Renk | A Theoretical Assessment of Jet-Hadron Correlations | 13 pages, 11 figures, 2 tables | null | 10.1103/PhysRevC.87.024905 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | With high-statistics data coming from both RHIC and LHC, the experimentally
available selection of hard tomographic probes for the medium created in
ultrarelativistic heavy-ion (A-A) collisions is rapidly expanding. Jet-hadron
(jet-h) correlation measurements as introduced by the STAR collaboration are a
promising avenue to study the structure of highly modified jets in a
differential way since the away side correlation can be measured down to very
low transverse momenta (P_T) in an essentially hydrodynamical regime. At the
same time the geometry bias introduced by the trigger condition ensures that
the away side shower has propagated a long distance in the medium. The aim of
this paper is to provide a theoretical overview of the observable, discuss
similarities and differences to other correlation observables such as
hadron-hadron (h-h) and gamma-hadron (gamma-h) correlations and to provide
recommendations for future measurements.
| [
{
"created": "Thu, 4 Oct 2012 08:24:40 GMT",
"version": "v1"
}
] | 2013-03-14 | [
[
"Renk",
"Thorsten",
""
]
] | With high-statistics data coming from both RHIC and LHC, the experimentally available selection of hard tomographic probes for the medium created in ultrarelativistic heavy-ion (A-A) collisions is rapidly expanding. Jet-hadron (jet-h) correlation measurements as introduced by the STAR collaboration are a promising avenue to study the structure of highly modified jets in a differential way since the away side correlation can be measured down to very low transverse momenta (P_T) in an essentially hydrodynamical regime. At the same time the geometry bias introduced by the trigger condition ensures that the away side shower has propagated a long distance in the medium. The aim of this paper is to provide a theoretical overview of the observable, discuss similarities and differences to other correlation observables such as hadron-hadron (h-h) and gamma-hadron (gamma-h) correlations and to provide recommendations for future measurements. |
2211.14536 | Stephan Narison | Stephan Narison | QCD spectral sum rules 2022 | 13 pages, 13 figures, 5 Tables, Latex source files. Review Talk
presented at QCD22, 25th International Conference in QCD (4-7 july
2022,Montpellier - FR) and at HEPMAD 22 , 12th HEP International Conference.
(10-16 october 2022, Antananarivo - MG). arXiv admin note: text overlap with
arXiv:2101.12579. References corrected | null | null | null | hep-ph hep-ex hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a compact review of the status of QCD spectral sum rules until
2022. We emphasize the recent progresses for determining the QCD input
parameters ($\alpha_s$, running quark masses, quark and gluon condensates)
where their correlations have been taken into account. Some selected
phenomenological uses of the sum rules in different channels (light and heavy
quarks, gluonia/glueballs, hybrids and four-quark states) are briefly reviewed
and commented. The estimate of the $1^{-+}$ light hybrid mass is revised which
confirms the hybrid nature of the $\pi_1(1600)$ but not the $\pi_1(2050)$.
| [
{
"created": "Sat, 26 Nov 2022 10:40:04 GMT",
"version": "v1"
},
{
"created": "Fri, 20 Jan 2023 09:36:46 GMT",
"version": "v2"
},
{
"created": "Sun, 6 Aug 2023 16:43:16 GMT",
"version": "v3"
}
] | 2023-08-08 | [
[
"Narison",
"Stephan",
""
]
] | We present a compact review of the status of QCD spectral sum rules until 2022. We emphasize the recent progresses for determining the QCD input parameters ($\alpha_s$, running quark masses, quark and gluon condensates) where their correlations have been taken into account. Some selected phenomenological uses of the sum rules in different channels (light and heavy quarks, gluonia/glueballs, hybrids and four-quark states) are briefly reviewed and commented. The estimate of the $1^{-+}$ light hybrid mass is revised which confirms the hybrid nature of the $\pi_1(1600)$ but not the $\pi_1(2050)$. |
hep-ph/0203214 | Werner Rodejohann | W. Rodejohann | Measuring leptonic CP Violation in Neutrinoless Double Beta Decay | 24 pages, 9 figures. Minor changes and references added | null | null | DO-TH 02/01 | hep-ph | null | We investigate under which circumstances one can show the existence of
leptonic CP violation with the help of a positive or negative signal in
neutrinoless double beta decay. The possibilities of cancellations are
investigated for special mass hierarchies and the different solar solutions.
The possibility that the mixing angle connected with the solar neutrino problem
is smaller or larger than pi/4 is taken into account. The non-maximality of
that angle in case of the LMA solution allows to make several useful
statements. The four different CP conserving possibilities are analyzed. It is
implemented how precisely the oscillation parameters will be known after
current and future experiments have taken data. The area in parameter space, in
which CP violation has to take place, is largest for the LOW solution and in
general larger for the inverse mass scheme.
| [
{
"created": "Fri, 22 Mar 2002 14:14:30 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Aug 2002 10:56:34 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Rodejohann",
"W.",
""
]
] | We investigate under which circumstances one can show the existence of leptonic CP violation with the help of a positive or negative signal in neutrinoless double beta decay. The possibilities of cancellations are investigated for special mass hierarchies and the different solar solutions. The possibility that the mixing angle connected with the solar neutrino problem is smaller or larger than pi/4 is taken into account. The non-maximality of that angle in case of the LMA solution allows to make several useful statements. The four different CP conserving possibilities are analyzed. It is implemented how precisely the oscillation parameters will be known after current and future experiments have taken data. The area in parameter space, in which CP violation has to take place, is largest for the LOW solution and in general larger for the inverse mass scheme. |
1706.05381 | Yu-Dai Tsai | Eric Kuflik, Maxim Perelstein, Nicolas Rey-Le Lorier, Yu-Dai Tsai | Phenomenology of ELDER Dark Matter | 31 pages, 6 figures, minor corrections, updates to match version
published in JHEP | JHEP 1708 (2017) 078 | 10.1007/JHEP08(2017)078 | null | hep-ph | http://creativecommons.org/licenses/by-nc-sa/4.0/ | We explore the phenomenology of Elastically Decoupling Relic (ELDER) dark
matter. ELDER is a thermal relic whose present density is determined primarily
by the cross-section of its elastic scattering off Standard Model (SM)
particles. Assuming that this scattering is mediated by a kinetically mixed
dark photon, we argue that the ELDER scenario makes robust predictions for
electron-recoil direct-detection experiments, as well as for dark photon
searches. These predictions are independent of the details of interactions
within the dark sector. Together with the closely related Strongly-Interacting
Massive Particle (SIMP) scenario, the ELDER predictions provide a physically
motivated, well-defined target region, which will be almost entirely accessible
to the next generation of searches for sub-GeV dark matter and dark photons. We
provide useful analytic approximations for various quantities of interest in
the ELDER scenario, and discuss two simple renormalizable toy models which
incorporate the required strong number-changing interactions among the ELDERs,
as well as explicitly implement the coupling to electrons via the dark photon
portal.
| [
{
"created": "Fri, 16 Jun 2017 18:00:00 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Jun 2018 18:10:02 GMT",
"version": "v2"
}
] | 2018-06-14 | [
[
"Kuflik",
"Eric",
""
],
[
"Perelstein",
"Maxim",
""
],
[
"Lorier",
"Nicolas Rey-Le",
""
],
[
"Tsai",
"Yu-Dai",
""
]
] | We explore the phenomenology of Elastically Decoupling Relic (ELDER) dark matter. ELDER is a thermal relic whose present density is determined primarily by the cross-section of its elastic scattering off Standard Model (SM) particles. Assuming that this scattering is mediated by a kinetically mixed dark photon, we argue that the ELDER scenario makes robust predictions for electron-recoil direct-detection experiments, as well as for dark photon searches. These predictions are independent of the details of interactions within the dark sector. Together with the closely related Strongly-Interacting Massive Particle (SIMP) scenario, the ELDER predictions provide a physically motivated, well-defined target region, which will be almost entirely accessible to the next generation of searches for sub-GeV dark matter and dark photons. We provide useful analytic approximations for various quantities of interest in the ELDER scenario, and discuss two simple renormalizable toy models which incorporate the required strong number-changing interactions among the ELDERs, as well as explicitly implement the coupling to electrons via the dark photon portal. |
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