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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0903.2150 | S. Weinzierl | Peter Skands and Stefan Weinzierl | Some remarks on dipole showers and the DGLAP equation | 28 pages, version to be published | Phys.Rev.D79:074021,2009 | 10.1103/PhysRevD.79.074021 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has been argued recently that parton showers based on colour dipoles
conflict with collinear factorization and do not lead to the correct DGLAP
equation. We show that this conclusion is based on an inappropriate assumption,
namely the choice of the gluon energy as evolution variable. We further show
numerically that Monte Carlo programs based on dipole showers with "infrared
sensible" evolution variables reproduce the DGLAP equation both in asymptotic
form as well as in comparison to the leading behaviour of second-order QCD
matrix elements.
| [
{
"created": "Thu, 12 Mar 2009 11:46:51 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Apr 2009 16:08:49 GMT",
"version": "v2"
}
] | 2009-11-20 | [
[
"Skands",
"Peter",
""
],
[
"Weinzierl",
"Stefan",
""
]
] | It has been argued recently that parton showers based on colour dipoles conflict with collinear factorization and do not lead to the correct DGLAP equation. We show that this conclusion is based on an inappropriate assumption, namely the choice of the gluon energy as evolution variable. We further show numerically that Monte Carlo programs based on dipole showers with "infrared sensible" evolution variables reproduce the DGLAP equation both in asymptotic form as well as in comparison to the leading behaviour of second-order QCD matrix elements. |
hep-ph/9409209 | Robert Thews | R. L. Thews | Formation Time Scales for Quarkonia in a Deconfining Medium | 5 pages, presented at DPF '94, Albuquerque, NM, August 1994 | null | null | null | hep-ph | null | Production of heavy quark antiquark systems in high energy heavy ion
collisions must involve relativistic momentum components in a quantum
mechanical approach. If the color forces are screened in a deconfining medium,
one can define the analog of a formation or separation time by an overlap
integral in the nonrelativistic bound state rest frame. This time parameter has
some interesting properties which depend on the momentum spectrum of the
initial quarks. Consequences of these properties for the phenomenology of
deconfinement signals are discussed.
| [
{
"created": "Fri, 2 Sep 1994 00:17:23 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Thews",
"R. L.",
""
]
] | Production of heavy quark antiquark systems in high energy heavy ion collisions must involve relativistic momentum components in a quantum mechanical approach. If the color forces are screened in a deconfining medium, one can define the analog of a formation or separation time by an overlap integral in the nonrelativistic bound state rest frame. This time parameter has some interesting properties which depend on the momentum spectrum of the initial quarks. Consequences of these properties for the phenomenology of deconfinement signals are discussed. |
2201.05264 | Ying Zhang | Guojun Xu, Jingjun Zhang, Chenzi Liao, Ying Zhang | The Structure of Flavor Mixing and Reconstruction of the Mass Matrix | 12 pages, 1 figures | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | The Fermion flavor structure is investigated by bilinear decomposition of the
mass matrix after EW symmetry breaking, and the roles of factorized matrices in
flavor mixing and mass generation are explored. It is shown that flavor mixing
can be addressed as an independent issue. On a new Yukawa basis, the minimal
parameterization of flavor mixing is realized containing two relative phases
and two free $SO(2)_L$ rotation angles. The validity of the flavor mixing
structure is checked in both the lepton and quark sectors. Under the
decomposition of flavor mixing, fermion mass matrices are reconstructed under
the hierarchy limit. A flat mass matrix with all elements equal to 1 arises
naturally from the requirement that homology exists between up-type and
down-type fermion mass matrices. Some hints of a flat matrix and flavor
breaking are also discussed.
| [
{
"created": "Fri, 14 Jan 2022 00:51:24 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Sep 2023 08:02:30 GMT",
"version": "v2"
}
] | 2023-09-12 | [
[
"Xu",
"Guojun",
""
],
[
"Zhang",
"Jingjun",
""
],
[
"Liao",
"Chenzi",
""
],
[
"Zhang",
"Ying",
""
]
] | The Fermion flavor structure is investigated by bilinear decomposition of the mass matrix after EW symmetry breaking, and the roles of factorized matrices in flavor mixing and mass generation are explored. It is shown that flavor mixing can be addressed as an independent issue. On a new Yukawa basis, the minimal parameterization of flavor mixing is realized containing two relative phases and two free $SO(2)_L$ rotation angles. The validity of the flavor mixing structure is checked in both the lepton and quark sectors. Under the decomposition of flavor mixing, fermion mass matrices are reconstructed under the hierarchy limit. A flat mass matrix with all elements equal to 1 arises naturally from the requirement that homology exists between up-type and down-type fermion mass matrices. Some hints of a flat matrix and flavor breaking are also discussed. |
1312.5803 | De-Min Li | Qi-Fang L\"u, Xiao-Hao Liu, Ju-Jun Xie, De-Min Li | The near threshold $\pi^- p \to \eta n$ reaction in an effective
Lagrangian approach | 5 pages, 4 figures, Accepted by Modern Physics Letters A | null | 10.1142/S0217732314500126 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The near threshold $\pi^- p \to \eta n$ reaction is studied within an
effective Lagrangian approach and the isobar model. By considering the
contributions from $s$- and $u$-channel nucleon pole and $N^{*}(1535)$
resonance, the total and differential cross sections of the $\pi^- p \to \eta
n$ reaction near threshold are calculated. Our theoretical results can fairly
reproduce the current experimental data. It is also shown that while the
center-of-mass energy lies in the range from the reaction threshold up to
$1.65$ GeV, $s$-channel $N^{*}(1535)$ resonance plays the dominant role. The
effect from nucleon pole is found to be small but the interference terms
between the $N^*(1535)$ resonance and the nucleon pole are significant. The
contributions from $t$-channel processes are negligible in the present
calculation.
| [
{
"created": "Fri, 20 Dec 2013 03:11:49 GMT",
"version": "v1"
}
] | 2015-06-18 | [
[
"Lü",
"Qi-Fang",
""
],
[
"Liu",
"Xiao-Hao",
""
],
[
"Xie",
"Ju-Jun",
""
],
[
"Li",
"De-Min",
""
]
] | The near threshold $\pi^- p \to \eta n$ reaction is studied within an effective Lagrangian approach and the isobar model. By considering the contributions from $s$- and $u$-channel nucleon pole and $N^{*}(1535)$ resonance, the total and differential cross sections of the $\pi^- p \to \eta n$ reaction near threshold are calculated. Our theoretical results can fairly reproduce the current experimental data. It is also shown that while the center-of-mass energy lies in the range from the reaction threshold up to $1.65$ GeV, $s$-channel $N^{*}(1535)$ resonance plays the dominant role. The effect from nucleon pole is found to be small but the interference terms between the $N^*(1535)$ resonance and the nucleon pole are significant. The contributions from $t$-channel processes are negligible in the present calculation. |
2401.14741 | Laboni Manna | Laboni Manna, Anton Safronov, Carlo Flore, Daniel Kikola,
Jean-Philippe Lansberg, Olivier Mattelaer | Asymmetric collisions in MadGraph5_aMC@NLO | 2 references added and a couple of sentences modified | null | null | null | hep-ph hep-ex nucl-th | http://creativecommons.org/licenses/by/4.0/ | We will gain unprecedented, high-accuracy insights into the internal
structure of the atomic nucleus thanks to lepton-hadron collision studies in
the coming years at the Electron-Ion-Collider (EIC) in the United States. A
good control of radiative corrections is necessary for the EIC to be fully
exploited and to extract valuable information from various measurements. We
present our extension of photoproduction at fixed order in MadGraph5_aMC@NLO, a
widely used framework for (next-to-)leading order calculations at the Large
Hadron Collider (LHC). It applies to electron-hadron collisions, in which the
quasi-real photon comes from an electron as well as to proton-nucleus and
nucleus-nucleus collisions.
| [
{
"created": "Fri, 26 Jan 2024 10:04:41 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Feb 2024 09:34:07 GMT",
"version": "v2"
}
] | 2024-02-05 | [
[
"Manna",
"Laboni",
""
],
[
"Safronov",
"Anton",
""
],
[
"Flore",
"Carlo",
""
],
[
"Kikola",
"Daniel",
""
],
[
"Lansberg",
"Jean-Philippe",
""
],
[
"Mattelaer",
"Olivier",
""
]
] | We will gain unprecedented, high-accuracy insights into the internal structure of the atomic nucleus thanks to lepton-hadron collision studies in the coming years at the Electron-Ion-Collider (EIC) in the United States. A good control of radiative corrections is necessary for the EIC to be fully exploited and to extract valuable information from various measurements. We present our extension of photoproduction at fixed order in MadGraph5_aMC@NLO, a widely used framework for (next-to-)leading order calculations at the Large Hadron Collider (LHC). It applies to electron-hadron collisions, in which the quasi-real photon comes from an electron as well as to proton-nucleus and nucleus-nucleus collisions. |
1408.6382 | Ravi Kuchimanchi | Ravi Kuchimanchi | Leptonic CP problem in left-right symmetric model | Version to appear in Phys. Rev. D, Rapid Communications, April 2015 | Phys. Rev. D 91, 071901 (2015) | 10.1103/PhysRevD.91.071901 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We find using the minimal left-right symmetric model that the presence of
leptonic CP violation can radiatively generate a strong CP phase at the
one-loop level itself, which can be beyond the current bounds established by
the neutron electic dipole moment experiments. If there are no axions or
unnatural cancellations, this leads to the testable prediction that leptonic CP
violation must be negligibly small (Dirac phase $\delta_{CP} = 0$ or $\pi$), in
a wide and interesting region of parameter space.
| [
{
"created": "Wed, 27 Aug 2014 10:57:22 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Oct 2014 15:43:34 GMT",
"version": "v2"
},
{
"created": "Tue, 7 Apr 2015 22:46:35 GMT",
"version": "v3"
}
] | 2015-04-29 | [
[
"Kuchimanchi",
"Ravi",
""
]
] | We find using the minimal left-right symmetric model that the presence of leptonic CP violation can radiatively generate a strong CP phase at the one-loop level itself, which can be beyond the current bounds established by the neutron electic dipole moment experiments. If there are no axions or unnatural cancellations, this leads to the testable prediction that leptonic CP violation must be negligibly small (Dirac phase $\delta_{CP} = 0$ or $\pi$), in a wide and interesting region of parameter space. |
1909.08676 | Diganta Das | Diganta Das | Lepton flavor violating $\Lambda_b\to\Lambda\ell_1\ell_2$ decay | 9 pages, two figures, published in EPJC, matches published version | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Inspired by the recent hints of lepton flavor universality violation in $b\to
s\ell\ell$ and $b\to c\ell\nu$ transitions, we study lepton flavor violating
exclusive $\Lambda_b\to\Lambda\ell_1^+\ell_2^-$ ($\ell_1\neq \ell_2$) decay,
which is forbidden in the Standard Model. Starting from a general effective
Hamiltonian for a $b\to s\ell_1^+\ell_2^-$ transition that includes vector and
axial-vector operators, and scalar and pseudo-scalar operators, we derive a
two-fold decay distribution of $\Lambda_b\to\Lambda\ell_1^+\ell_2^-$. The
distribution helps us to construct the differential branching ratio and the
lepton side forward-backward asymmetry, which are studied in a vector
leptoquark model. The parameter space of the vector leptoquark model is
constrained by low energy observables.
| [
{
"created": "Wed, 18 Sep 2019 20:05:45 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Sep 2019 17:09:39 GMT",
"version": "v2"
},
{
"created": "Sun, 22 Dec 2019 06:40:56 GMT",
"version": "v3"
}
] | 2019-12-24 | [
[
"Das",
"Diganta",
""
]
] | Inspired by the recent hints of lepton flavor universality violation in $b\to s\ell\ell$ and $b\to c\ell\nu$ transitions, we study lepton flavor violating exclusive $\Lambda_b\to\Lambda\ell_1^+\ell_2^-$ ($\ell_1\neq \ell_2$) decay, which is forbidden in the Standard Model. Starting from a general effective Hamiltonian for a $b\to s\ell_1^+\ell_2^-$ transition that includes vector and axial-vector operators, and scalar and pseudo-scalar operators, we derive a two-fold decay distribution of $\Lambda_b\to\Lambda\ell_1^+\ell_2^-$. The distribution helps us to construct the differential branching ratio and the lepton side forward-backward asymmetry, which are studied in a vector leptoquark model. The parameter space of the vector leptoquark model is constrained by low energy observables. |
0906.5541 | Paola Ferrario | Paola Ferrario, German Rodrigo | Constraining heavy colored resonances from top-antitop quark events | 4 pages, 4 figures. References added, final version to appear in
Phys.Rev.D | Phys.Rev.D80:051701,2009 | 10.1103/PhysRevD.80.051701 | IFIC/09-25 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent measurements of the top quark charge asymmetry at Tevatron disfavor
the existence of flavor universal axigluons and colorons at 2 sigmas. In this
letter we explore the possibility to reconcile the data with these models and
use the charge asymmetry and the invariant mass distribution of top-antitop
quark pair events to constrain the mass and couplings of massive color-octet
gauge bosons decaying to top quarks.
| [
{
"created": "Tue, 30 Jun 2009 14:34:20 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Sep 2009 14:20:09 GMT",
"version": "v2"
}
] | 2009-10-20 | [
[
"Ferrario",
"Paola",
""
],
[
"Rodrigo",
"German",
""
]
] | Recent measurements of the top quark charge asymmetry at Tevatron disfavor the existence of flavor universal axigluons and colorons at 2 sigmas. In this letter we explore the possibility to reconcile the data with these models and use the charge asymmetry and the invariant mass distribution of top-antitop quark pair events to constrain the mass and couplings of massive color-octet gauge bosons decaying to top quarks. |
1602.06270 | Juergen Reuter | J. Reuter, B. Chokoufe, A. Hoang, W. Kilian, M. Stahlhofen, T.
Teubner, C. Weiss | Automation of NLO processes and decays and POWHEG matching in WHIZARD | 5 pages, 3 figures, Talk presented at ACAT 2016 at UTFSM,
Valpara\'iso, Chile | null | 10.1088/1742-6596/762/1/012059 | DESY 16-033, UWTHPH 2016, MITP/16-022, LTH 1077, SI-HEP-2016-06 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We give a status report on the automation of next-to-leading order processes
within the Monte Carlo event generator WHIZARD, using GoSam and OpenLoops as
provider for one-loop matrix elements. To deal with divergences, WHIZARD uses
automated FKS subtraction, and the phase space for singular regions is
generated automatically. NLO examples for both scattering and decay processes
with a focus on e+e- processes are shown. Also, first NLO-studies of
observables for collisions of polarized leptons beams, e.g. at the ILC, will be
presented. Furthermore, the automatic matching of the fixed-order NLO
amplitudes with emissions from the parton shower within the POWHEG formalism
inside WHIZARD will be discussed. We also present results for top pairs at
threshold in lepton collisions, including matching between a resummed threshold
calculation and fixed-order NLO. This allows the investigation of more
exclusive differential observables.
| [
{
"created": "Fri, 19 Feb 2016 20:05:42 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Mar 2016 09:13:49 GMT",
"version": "v2"
}
] | 2016-12-21 | [
[
"Reuter",
"J.",
""
],
[
"Chokoufe",
"B.",
""
],
[
"Hoang",
"A.",
""
],
[
"Kilian",
"W.",
""
],
[
"Stahlhofen",
"M.",
""
],
[
"Teubner",
"T.",
""
],
[
"Weiss",
"C.",
""
]
] | We give a status report on the automation of next-to-leading order processes within the Monte Carlo event generator WHIZARD, using GoSam and OpenLoops as provider for one-loop matrix elements. To deal with divergences, WHIZARD uses automated FKS subtraction, and the phase space for singular regions is generated automatically. NLO examples for both scattering and decay processes with a focus on e+e- processes are shown. Also, first NLO-studies of observables for collisions of polarized leptons beams, e.g. at the ILC, will be presented. Furthermore, the automatic matching of the fixed-order NLO amplitudes with emissions from the parton shower within the POWHEG formalism inside WHIZARD will be discussed. We also present results for top pairs at threshold in lepton collisions, including matching between a resummed threshold calculation and fixed-order NLO. This allows the investigation of more exclusive differential observables. |
1907.05097 | Yong-Jiang Xu | Yong-Jiang Xu, Chun-Yu Cui, Yong-Lu Liu, and Ming-Qiu Huang | Partial decay widths of $P_{c}(4312)$ as a $\bar{D}\Sigma_{c}$ molecular
state | 18 page,11 figures | Phys. Rev. D 102, 034028 (2020) | 10.1103/PhysRevD.102.034028 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the present work, the partial decay widths of $P_{c}(4312)$ to $\eta_{c}
p$ and $J/\psi p$ are investigated with the QCD sum rule method under the
assumption that $P_{c}(4312)$ is a $\bar{D}\Sigma_{c}$ molecular state with
$J^{P}=\frac{1}{2}^{-}$. In the analysis, the pole residue of $P_{c}(4312)$,
one of the input parameters for the calculations of the strong decay constants,
is calculated first. With the numerical values of the strong decay constants,
the partial decay widths to $\eta_{c} p$ and $J/\psi p$ are estimated to be
$\Gamma(P_{c}(4312)\rightarrow \eta_{c} p)=5.54^{+0.75}_{-0.5}\mbox{MeV}$ and
$\Gamma(P_{c}(4312)\rightarrow J/\psi p)=1.67^{+0.92}_{-0.56}\mbox{MeV}$,
respectively, which are compatible with the measured total width of
$P_{c}(4312)$. The results suggest that it is reasonable to assign
$P_{c}(4312)$ to be a $\bar{D}\Sigma_{c}$ molecular state with
$J^{P}=\frac{1}{2}^{-}$.
| [
{
"created": "Thu, 11 Jul 2019 10:46:55 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Apr 2020 01:45:24 GMT",
"version": "v2"
},
{
"created": "Wed, 26 Aug 2020 01:36:49 GMT",
"version": "v3"
}
] | 2020-09-02 | [
[
"Xu",
"Yong-Jiang",
""
],
[
"Cui",
"Chun-Yu",
""
],
[
"Liu",
"Yong-Lu",
""
],
[
"Huang",
"Ming-Qiu",
""
]
] | In the present work, the partial decay widths of $P_{c}(4312)$ to $\eta_{c} p$ and $J/\psi p$ are investigated with the QCD sum rule method under the assumption that $P_{c}(4312)$ is a $\bar{D}\Sigma_{c}$ molecular state with $J^{P}=\frac{1}{2}^{-}$. In the analysis, the pole residue of $P_{c}(4312)$, one of the input parameters for the calculations of the strong decay constants, is calculated first. With the numerical values of the strong decay constants, the partial decay widths to $\eta_{c} p$ and $J/\psi p$ are estimated to be $\Gamma(P_{c}(4312)\rightarrow \eta_{c} p)=5.54^{+0.75}_{-0.5}\mbox{MeV}$ and $\Gamma(P_{c}(4312)\rightarrow J/\psi p)=1.67^{+0.92}_{-0.56}\mbox{MeV}$, respectively, which are compatible with the measured total width of $P_{c}(4312)$. The results suggest that it is reasonable to assign $P_{c}(4312)$ to be a $\bar{D}\Sigma_{c}$ molecular state with $J^{P}=\frac{1}{2}^{-}$. |
2212.09722 | Christoph Andreas Ternes | C. Giunti, Y.F. Li, C.A. Ternes, Z. Xin | Inspection of the detection cross section dependence of the Gallium
Anomaly | v3: 11 pages, 4 figures, 3 tables, references added, typo corrected | null | 10.1016/j.physletb.2023.137983 | null | hep-ph hep-ex nucl-ex nucl-th | http://creativecommons.org/licenses/by/4.0/ | We discuss in detail the dependence of the Gallium Anomaly on the detection
cross section. We provide updated values of the size of the Gallium Anomaly and
find that its significance is larger than about $5\sigma$ for all the detection
cross section models. We discuss the dependence of the Gallium Anomaly on the
assumed value of the half life of ${}^{71}\text{Ge}$, which determines the
cross sections of the transitions from the ground state of ${}^{71}\text{Ga}$
to the ground state of ${}^{71}\text{Ge}$. We show that a value of the
${}^{71}\text{Ge}$ half life which is larger than the standard one can reduce
or even solve the Gallium Anomaly. Considering the short-baseline neutrino
oscillation interpretation of the Gallium Anomaly, we show that a value of the
${}^{71}\text{Ge}$ half life which is larger than the standard one can reduce
the tension with the results of other experiments. Since the standard value of
the ${}^{71}\text{Ge}$ half life was measured in 1985, we advocate the
importance of new measurements with modern technique and apparatus for a better
assessment of the Gallium Anomaly.
| [
{
"created": "Mon, 19 Dec 2022 18:49:12 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Dec 2022 12:53:12 GMT",
"version": "v2"
},
{
"created": "Tue, 14 Mar 2023 08:48:58 GMT",
"version": "v3"
}
] | 2023-06-28 | [
[
"Giunti",
"C.",
""
],
[
"Li",
"Y. F.",
""
],
[
"Ternes",
"C. A.",
""
],
[
"Xin",
"Z.",
""
]
] | We discuss in detail the dependence of the Gallium Anomaly on the detection cross section. We provide updated values of the size of the Gallium Anomaly and find that its significance is larger than about $5\sigma$ for all the detection cross section models. We discuss the dependence of the Gallium Anomaly on the assumed value of the half life of ${}^{71}\text{Ge}$, which determines the cross sections of the transitions from the ground state of ${}^{71}\text{Ga}$ to the ground state of ${}^{71}\text{Ge}$. We show that a value of the ${}^{71}\text{Ge}$ half life which is larger than the standard one can reduce or even solve the Gallium Anomaly. Considering the short-baseline neutrino oscillation interpretation of the Gallium Anomaly, we show that a value of the ${}^{71}\text{Ge}$ half life which is larger than the standard one can reduce the tension with the results of other experiments. Since the standard value of the ${}^{71}\text{Ge}$ half life was measured in 1985, we advocate the importance of new measurements with modern technique and apparatus for a better assessment of the Gallium Anomaly. |
0711.5023 | Mikhail Dubinin | M. Dubinin (1), A. Sukachev (2) ((1) Inst. of Nucl. Phys., Moscow
State Univ., (2) Physics Dept., Moscow State Univ.) | K^0 - \bar K^0, B^0 - \bar B^0 mixings in the MSSM with explicit CP
violation in the Higgs sector | 22 pages, 7 figures, 5 tables | Phys.Atom.Nucl.71:374-387,2008 | 10.1007/s11450-008-2018-3 | null | hep-ph | null | We consider the K^0 - \bar K^0 and B^0 - \bar B^0 mixings in the MSSM with
the two-Higgs-doublet scalar sector featuring explicit CP violation, and the
Yukawa sector of type II. In the case of strong mixing between CP-odd and
CP-even states the existence of light charged Higgs is allowed in the model.
The mass splitting \Delta m_{LS} and the amount of indirect CP violation
\epsilon are calculated. In the limit of effective low-energy approximation the
nonstandard effects are shown to be negligibly small in \Delta m_{LS} and
\epsilon for the K^0-mesons, being almost independent on the charged Higgs
boson mass. However, for the B_d^0 - \bar B_d^0 and B_s^0 - \bar B_s^0 systems
the effects of nonstandard physics are shown to be larger, limiting the MSSM
parameter space.
| [
{
"created": "Fri, 30 Nov 2007 20:08:17 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Dubinin",
"M.",
""
],
[
"Sukachev",
"A.",
""
]
] | We consider the K^0 - \bar K^0 and B^0 - \bar B^0 mixings in the MSSM with the two-Higgs-doublet scalar sector featuring explicit CP violation, and the Yukawa sector of type II. In the case of strong mixing between CP-odd and CP-even states the existence of light charged Higgs is allowed in the model. The mass splitting \Delta m_{LS} and the amount of indirect CP violation \epsilon are calculated. In the limit of effective low-energy approximation the nonstandard effects are shown to be negligibly small in \Delta m_{LS} and \epsilon for the K^0-mesons, being almost independent on the charged Higgs boson mass. However, for the B_d^0 - \bar B_d^0 and B_s^0 - \bar B_s^0 systems the effects of nonstandard physics are shown to be larger, limiting the MSSM parameter space. |
hep-ph/0011362 | Qun Wang | Qun Wang, G\"osta Gustafson, Yi Jin, Qu-bing Xie | Properties of color singlet chain states in $e^+e^-$ annihilation | RevTex, 23 pages, 5 figures; Phys. Rev. D accepted version | Phys.Rev. D64 (2001) 012006 | 10.1103/PhysRevD.64.012006 | null | hep-ph | null | We use the method of the color effective Hamiltonian to study the structure
of color singlet chain states in $N_c=3$ and in the large $N_c$ limit. In order
to obtain their total fraction when $N_c$ is finite, we illustrate how to
orthogonalize these non-orthogonal states. We give numerical results for the
fraction of orthogonalized states in $e^+e^-\to q\bar{q}gg$. With the help of a
diagram technique, we derive their fraction up to $O(1/N_c^2)$ for the general
multigluon process. For large $N_c$ the singlet chain states correspond to
well-defined color topologies. Therefore we may expect that the fraction of
non-color-singlet-chain states is an estimate of the fraction of events where
color reconnection is possible. In the case of soft gluon bremsstrahlung, we
give an explicit form for the color effective Hamiltonian which leads to the
dipole cascade formulation for parton showering in leading order in $N_c$. The
next-to-leading order corrections are also given for $e^+e^-\to q\bar{q}g_1g_2$
and $e^+e^-\to q\bar{q}g_1g_2g_3$.
| [
{
"created": "Wed, 29 Nov 2000 13:49:40 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Dec 2000 16:04:07 GMT",
"version": "v2"
},
{
"created": "Tue, 10 Apr 2001 16:36:56 GMT",
"version": "v3"
}
] | 2009-10-31 | [
[
"Wang",
"Qun",
""
],
[
"Gustafson",
"Gösta",
""
],
[
"Jin",
"Yi",
""
],
[
"Xie",
"Qu-bing",
""
]
] | We use the method of the color effective Hamiltonian to study the structure of color singlet chain states in $N_c=3$ and in the large $N_c$ limit. In order to obtain their total fraction when $N_c$ is finite, we illustrate how to orthogonalize these non-orthogonal states. We give numerical results for the fraction of orthogonalized states in $e^+e^-\to q\bar{q}gg$. With the help of a diagram technique, we derive their fraction up to $O(1/N_c^2)$ for the general multigluon process. For large $N_c$ the singlet chain states correspond to well-defined color topologies. Therefore we may expect that the fraction of non-color-singlet-chain states is an estimate of the fraction of events where color reconnection is possible. In the case of soft gluon bremsstrahlung, we give an explicit form for the color effective Hamiltonian which leads to the dipole cascade formulation for parton showering in leading order in $N_c$. The next-to-leading order corrections are also given for $e^+e^-\to q\bar{q}g_1g_2$ and $e^+e^-\to q\bar{q}g_1g_2g_3$. |
1905.05259 | Ron S. Longacre | R.S. Longacre | The Photon and Light $1^{--}$ Mesons | null | null | null | BNL_211629_2019_INRE | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we look into the world data related to the photon and the
connection to light mesons with the same spin parity quantum number as the
photon $J^p = 1^-$.
| [
{
"created": "Mon, 13 May 2019 19:34:00 GMT",
"version": "v1"
}
] | 2019-05-15 | [
[
"Longacre",
"R. S.",
""
]
] | In this paper we look into the world data related to the photon and the connection to light mesons with the same spin parity quantum number as the photon $J^p = 1^-$. |
hep-ph/9301264 | null | Palash B. Pal | Rare K-Decays as Crucial Tests for Unified Models with Gauged Baryon
Number: | (7 pages, LATEX, including figures drawn by LATEX) DOE-ER40200-304
CPP-50 | Phys.Lett. B311 (1993) 153-156 | 10.1016/0370-2693(93)90548-V | null | hep-ph | null | In the grand-unified models based on SU(15) and SU(16) in which the quarks
and leptons are un-unified at the intermediate stages, we show that ${\rm BR}\;
(K_L \to \mu e) \leq 10^{-14}$ and ${\rm BR}\; (K^+ \to \pi^+\mu e) \leq
10^{-14}$ despite the presence of leptoquark gauge bosons. Thus, the
observation of these processes in the ongoing or upcoming experiments will rule
out the models.
| [
{
"created": "Fri, 22 Jan 1993 22:43:14 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Pal",
"Palash B.",
""
]
] | In the grand-unified models based on SU(15) and SU(16) in which the quarks and leptons are un-unified at the intermediate stages, we show that ${\rm BR}\; (K_L \to \mu e) \leq 10^{-14}$ and ${\rm BR}\; (K^+ \to \pi^+\mu e) \leq 10^{-14}$ despite the presence of leptoquark gauge bosons. Thus, the observation of these processes in the ongoing or upcoming experiments will rule out the models. |
hep-ph/9809230 | Antonio Vairo | Nora Brambilla (Univ. Vienna) and Antonio Vairo (HEPHY Vienna) | Some aspects of the quark-antiquark Wilson loop formalism in the NRQCD
framework | 4 pages, Latex (espcrc2.sty), 2 figures. Talk presented at the
Euroconference QCD'98, Montpellier, July 2-8, 1998; to appear in Nucl. Phys.
B (Proc. Suppl.) | Nucl.Phys.Proc.Suppl. 74 (1999) 201-204 | 10.1016/S0920-5632(99)00162-0 | HEPHY-PUB 698/98, UWThPH-1998-35 | hep-ph | null | Starting from the NRQCD Lagrangian the heavy quark-antiquark potential is
written in terms of field strength insertions on a static Wilson loop. The
relevant matching coefficients are given at the present status of knowledge.
The short-range, perturbatively dominated, behaviour of the spin-dependent
terms is discussed.
| [
{
"created": "Wed, 2 Sep 1998 09:44:13 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Brambilla",
"Nora",
"",
"Univ. Vienna"
],
[
"Vairo",
"Antonio",
"",
"HEPHY Vienna"
]
] | Starting from the NRQCD Lagrangian the heavy quark-antiquark potential is written in terms of field strength insertions on a static Wilson loop. The relevant matching coefficients are given at the present status of knowledge. The short-range, perturbatively dominated, behaviour of the spin-dependent terms is discussed. |
2011.08195 | Mathias Pierre | Roberto A. Lineros, Mathias Pierre | Dark Matter candidates in a Type-II radiative neutrino mass model | 37 pages, 13 figures; mu to e gamma analysis added, matches the
version published in JHEP | J. High Energ. Phys. 2021, 72 (2021) | 10.1007/JHEP06(2021)072 | IFT-UAM/CSIC-20-145 | hep-ph astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | We explore the connection between Dark Matter and neutrinos in a model
inspired by radiative Type-II seessaw and scotogenic scenarios. In our model,
we introduce new electroweakly charged states (scalars and a vector-like
fermion) and impose a discrete $\mathbb{Z}_2$ symmetry. Neutrino masses are
generated at the loop level and the lightest $\mathbb{Z}_2$-odd neutral
particle is stable and it can play the role of a Dark Matter candidate. We
perform a numerical analysis of the model showing that neutrino masses and
flavour structure can be reproduced in addition to the correct dark matter
density, with viable DM masses from 700 GeV to 30 TeV. We explore direct and
indirect detection signatures and show interesting detection prospects by CTA,
Darwin and KM3Net and highlight the complementarity between these observables.
| [
{
"created": "Mon, 16 Nov 2020 19:00:01 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Jun 2021 07:25:08 GMT",
"version": "v2"
}
] | 2021-06-16 | [
[
"Lineros",
"Roberto A.",
""
],
[
"Pierre",
"Mathias",
""
]
] | We explore the connection between Dark Matter and neutrinos in a model inspired by radiative Type-II seessaw and scotogenic scenarios. In our model, we introduce new electroweakly charged states (scalars and a vector-like fermion) and impose a discrete $\mathbb{Z}_2$ symmetry. Neutrino masses are generated at the loop level and the lightest $\mathbb{Z}_2$-odd neutral particle is stable and it can play the role of a Dark Matter candidate. We perform a numerical analysis of the model showing that neutrino masses and flavour structure can be reproduced in addition to the correct dark matter density, with viable DM masses from 700 GeV to 30 TeV. We explore direct and indirect detection signatures and show interesting detection prospects by CTA, Darwin and KM3Net and highlight the complementarity between these observables. |
hep-ph/0104195 | Alexandros Kehagias | A. Kehagias and K. Tamvakis | A note on brane cosmology | 10 pages, references added | Phys.Lett. B515 (2001) 155-160 | 10.1016/S0370-2693(01)00854-1 | null | hep-ph hep-th | null | We derive a new class of time-dependent solutions for the Randall-Sundrum
model by patching together isometries broken by the brane. Solutions generated
by generalized boosts along the fifth dimension are associated with localized
gravity and lead to an effective Friedman equation on the brane with a scale
factor exhibiting power law or exponential behaviour. The effective
energy-density on the brane depends linearly on the brane tension.
| [
{
"created": "Thu, 19 Apr 2001 17:10:47 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Apr 2001 14:46:27 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Kehagias",
"A.",
""
],
[
"Tamvakis",
"K.",
""
]
] | We derive a new class of time-dependent solutions for the Randall-Sundrum model by patching together isometries broken by the brane. Solutions generated by generalized boosts along the fifth dimension are associated with localized gravity and lead to an effective Friedman equation on the brane with a scale factor exhibiting power law or exponential behaviour. The effective energy-density on the brane depends linearly on the brane tension. |
1501.07150 | Daniele Binosi | A. C. Aguilar, D. Binosi and J. Papavassiliou | Yang-Mills two-point functions in linear covariant gauges | 28 pages, 10 figures | Phys. Rev. D 91, 085014 (2015) | 10.1103/PhysRevD.91.085014 | null | hep-ph hep-lat hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we use two different but complementary approaches in order to
study the ghost propagator of a pure SU(3) Yang-Mills theory quantized in the
linear covariant gauges, focusing on its dependence on the gauge-fixing
parameter $\xi$ in the deep infrared. In particular, we first solve the
Schwinger-Dyson equation that governs the dynamics of the ghost propagator,
using a set of simplifying approximations, and under the crucial assumption
that the gluon propagators for $\xi>0$ are infrared finite, as is the case in
the Landau gauge $(\xi=0)$. Then we appeal to the Nielsen identities, and
express the derivative of the ghost propagator with respect to $\xi$ in terms
of certain auxiliary Green's functions, which are subsequently computed under
the same assumptions as before. Within both formalisms we find that for $\xi>0$
the ghost dressing function approaches zero in the deep infrared, in sharp
contrast to what happens in the Landau gauge, where it known to saturate at a
finite (non-vanishing) value. The Nielsen identities are then extended to the
case of the gluon propagator, and the $\xi$-dependence of the corresponding
gluon masses is derived using as input the results obtained in the previous
steps. The result turns out to be logarithmically divergent in the deep
infrared; the compatibility of this behavior with the basic assumption of a
finite gluon propagator is discussed, and a specific Ansatz is put forth, which
readily reconciles both features.
| [
{
"created": "Wed, 28 Jan 2015 15:36:05 GMT",
"version": "v1"
}
] | 2015-04-16 | [
[
"Aguilar",
"A. C.",
""
],
[
"Binosi",
"D.",
""
],
[
"Papavassiliou",
"J.",
""
]
] | In this work we use two different but complementary approaches in order to study the ghost propagator of a pure SU(3) Yang-Mills theory quantized in the linear covariant gauges, focusing on its dependence on the gauge-fixing parameter $\xi$ in the deep infrared. In particular, we first solve the Schwinger-Dyson equation that governs the dynamics of the ghost propagator, using a set of simplifying approximations, and under the crucial assumption that the gluon propagators for $\xi>0$ are infrared finite, as is the case in the Landau gauge $(\xi=0)$. Then we appeal to the Nielsen identities, and express the derivative of the ghost propagator with respect to $\xi$ in terms of certain auxiliary Green's functions, which are subsequently computed under the same assumptions as before. Within both formalisms we find that for $\xi>0$ the ghost dressing function approaches zero in the deep infrared, in sharp contrast to what happens in the Landau gauge, where it known to saturate at a finite (non-vanishing) value. The Nielsen identities are then extended to the case of the gluon propagator, and the $\xi$-dependence of the corresponding gluon masses is derived using as input the results obtained in the previous steps. The result turns out to be logarithmically divergent in the deep infrared; the compatibility of this behavior with the basic assumption of a finite gluon propagator is discussed, and a specific Ansatz is put forth, which readily reconciles both features. |
hep-ph/0603117 | HongWei Ke | Hong-Wei Ke, Yan-Ming Yu, Yi-Bing Ding, Xin-Heng Guo, Hong-Ying Jin,
Xue-Qian Li, Peng-Nian Shen and Guo-Li Wang | Study on Strong Decays of $D_{sJ}(2632)$ | 11 pages, 6 figures | High Energy Phys.Nucl.Phys.30:936-943,2006 | null | null | hep-ph | null | The resonance $D_{sJ}(2632)$ observed by SELEX, has attracted great interests
and meanwhile brought up serious dispute. Its spin-parity, so far has not
finally determined and if it exists, its quark-structure might be exotic.
Following the previous literature where $D_{sJ}(2632)$ is assumed to be a
radial-excited state of $1^-$, we consider the possibilities that it might be a
$q\bar q$ ground state of $2^+$ or the first radial-excited state of $0^+$
$D_{sJ}(2317)$ and re-calculate its strong decay widths in terms of the
Bethe-Salpeter equation. Our results indicate that there still is a sharp
discrepancy between the theoretical evaluation and data.
| [
{
"created": "Thu, 16 Mar 2006 09:07:28 GMT",
"version": "v1"
}
] | 2014-11-18 | [
[
"Ke",
"Hong-Wei",
""
],
[
"Yu",
"Yan-Ming",
""
],
[
"Ding",
"Yi-Bing",
""
],
[
"Guo",
"Xin-Heng",
""
],
[
"Jin",
"Hong-Ying",
""
],
[
"Li",
"Xue-Qian",
""
],
[
"Shen",
"Peng-Nian",
""
],
[
"Wang",
... | The resonance $D_{sJ}(2632)$ observed by SELEX, has attracted great interests and meanwhile brought up serious dispute. Its spin-parity, so far has not finally determined and if it exists, its quark-structure might be exotic. Following the previous literature where $D_{sJ}(2632)$ is assumed to be a radial-excited state of $1^-$, we consider the possibilities that it might be a $q\bar q$ ground state of $2^+$ or the first radial-excited state of $0^+$ $D_{sJ}(2317)$ and re-calculate its strong decay widths in terms of the Bethe-Salpeter equation. Our results indicate that there still is a sharp discrepancy between the theoretical evaluation and data. |
hep-ph/9906456 | Carlo Giunti | C. Giunti | Four-neutrino MS^2 mixing | 17 pages including 3 figures, RevTeX | Phys.Lett.B467:83-94,1999 | 10.1016/S0370-2693(99)01094-1 | DFTT 35/99 | hep-ph hep-ex | null | We present a simple scheme of mixing of four neutrinos that can accommodate
the results of all neutrino oscillation experiments, the observed abundances of
primordial elements and the current upper bound for the effective Majorana
neutrino mass in neutrinoless double-beta decay (assuming that massive
neutrinos are Majorana particles). The scheme has maximal mixing in the
nu_mu,nu_tau-nu_3,nu_4 sector and small mixings in the nu_e,nu_s-nu_1,nu_2 and
nu_e,nu_mu-nu_1,nu_3 (or nu_e,nu_mu-nu_1,nu_4) sectors (MS^2). We discuss the
implications of this scheme for short and long baseline oscillation experiments
and for neutrinoless double-beta decay and tritium beta-decay experiments.
| [
{
"created": "Tue, 22 Jun 1999 17:46:46 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Jun 1999 10:41:41 GMT",
"version": "v2"
}
] | 2011-08-17 | [
[
"Giunti",
"C.",
""
]
] | We present a simple scheme of mixing of four neutrinos that can accommodate the results of all neutrino oscillation experiments, the observed abundances of primordial elements and the current upper bound for the effective Majorana neutrino mass in neutrinoless double-beta decay (assuming that massive neutrinos are Majorana particles). The scheme has maximal mixing in the nu_mu,nu_tau-nu_3,nu_4 sector and small mixings in the nu_e,nu_s-nu_1,nu_2 and nu_e,nu_mu-nu_1,nu_3 (or nu_e,nu_mu-nu_1,nu_4) sectors (MS^2). We discuss the implications of this scheme for short and long baseline oscillation experiments and for neutrinoless double-beta decay and tritium beta-decay experiments. |
1303.2233 | Kazem Azizi | K. Azizi, S. Kartal, A. T. Olgun, Z. Tavukoglu | Analysis of the radiative $\Lambda_b\rightarrow \Lambda \gamma$
transition in SM and scenarios with one or two universal extra dimensions | 22 Pages, 4 Figures and 5 Tables | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the radiative process of the $\Lambda_b\rightarrow \Lambda
\gamma$ in the standard model as well as models with one or two compact
universal extra dimensions. Using the form factors entered to the low energy
matrix elements, calculated via light cone QCD in full theory, we calculate the
total decay width and branching ratio of this decay channel. We compare the
results of the extra dimensional models with those of the standard model on the
considered physical quantities and look for the deviations of the results from
the standard model predictions at different values of the compactification
scale (1/R).
| [
{
"created": "Sat, 9 Mar 2013 16:46:57 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Jul 2013 07:51:20 GMT",
"version": "v2"
}
] | 2013-07-22 | [
[
"Azizi",
"K.",
""
],
[
"Kartal",
"S.",
""
],
[
"Olgun",
"A. T.",
""
],
[
"Tavukoglu",
"Z.",
""
]
] | We investigate the radiative process of the $\Lambda_b\rightarrow \Lambda \gamma$ in the standard model as well as models with one or two compact universal extra dimensions. Using the form factors entered to the low energy matrix elements, calculated via light cone QCD in full theory, we calculate the total decay width and branching ratio of this decay channel. We compare the results of the extra dimensional models with those of the standard model on the considered physical quantities and look for the deviations of the results from the standard model predictions at different values of the compactification scale (1/R). |
1208.0510 | Daniel Almeida Fagundes | D. A. Fagundes, M. J. Menon | Hadronic Cross Sections, Elastic Slope and Physical Bounds | Contribution to XII Hadron Physics, Bento Gon\c{c}alves - RS, Brazil,
22-27th April 2012; to be published in AIP Proc. Conf | null | 10.1063/1.4795978 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An almost model-independent parametrization for the ratio of the total
hadronic cross section to elastic slope is discussed. Its applicability in
studies of asymptotia and analyses of extensive air shower in cosmic-ray
physics is also outlined.
| [
{
"created": "Thu, 2 Aug 2012 14:48:27 GMT",
"version": "v1"
}
] | 2015-06-11 | [
[
"Fagundes",
"D. A.",
""
],
[
"Menon",
"M. J.",
""
]
] | An almost model-independent parametrization for the ratio of the total hadronic cross section to elastic slope is discussed. Its applicability in studies of asymptotia and analyses of extensive air shower in cosmic-ray physics is also outlined. |
2209.13809 | Jingdong Shao | Jingdong Shao, Mei Huang | Gravitational waves and primordial black holes from chirality imbalanced
QCD first-order phase transition with $\mathcal {P}$ and $\mathcal {CP}$
violation | It contains 14 pages and 13 figures | null | 10.1103/PhysRevD.107.043011 | null | hep-ph astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | The chirality imbalance in QCD is spontaneously induced by a repulsive
axial-vector interaction from the instanton anti-instanton pairing at high
temperature above the chiral phase transition, and vanishes at low temperature.
The chiral chemical potential $\mu_5$ is in the same magnitude as estimated
from the sphaleron transition. Phase transition of the chirality imbalance is
always a first-order one in the early universe with $\mathcal {P}$ and
$\mathcal {CP}$ violation. The spectra of gravitational waves and the formation
of the primordial black holes from this first-order phase transition is
investigated in this work, and the effect of a strong magnetic field is also
analyzed. The gravitational waves produced by chirality imbalance can be
detected by LISA, Taiji and DECIGO, with the peak energy density locating in
the range of $10^{-11}$ to $10^{-9}$ and the peak frequencies lying in the
range of $10^{-5}$ Hz to $10^{-2}$ Hz. The spectrum with larger axial vector
coupling strength and stronger magnetic field has higher peak energy density
and lower peak frequency. According to this trend, the gravitational waves
spectra might also be able to be detected by SKA, IPTA and EPTA. The Phase
transition inverse duration $\beta/H_*$ calculated from the bounce solution is
in the order of $10^4$, which is much higher than typical value $10-100$ from
electroweak phase transitions. Based on the mechanism of postponement of the
false vacuum decay, it is found that the formation of the primordial black hole
is not favored because the phase transition completes in an extreme short time
due to the large value of $\beta/H_*$ and thus the false vacuum energy density
decays sharply.
| [
{
"created": "Wed, 28 Sep 2022 03:33:57 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Feb 2023 02:50:02 GMT",
"version": "v2"
},
{
"created": "Sat, 11 Feb 2023 05:56:08 GMT",
"version": "v3"
}
] | 2023-02-22 | [
[
"Shao",
"Jingdong",
""
],
[
"Huang",
"Mei",
""
]
] | The chirality imbalance in QCD is spontaneously induced by a repulsive axial-vector interaction from the instanton anti-instanton pairing at high temperature above the chiral phase transition, and vanishes at low temperature. The chiral chemical potential $\mu_5$ is in the same magnitude as estimated from the sphaleron transition. Phase transition of the chirality imbalance is always a first-order one in the early universe with $\mathcal {P}$ and $\mathcal {CP}$ violation. The spectra of gravitational waves and the formation of the primordial black holes from this first-order phase transition is investigated in this work, and the effect of a strong magnetic field is also analyzed. The gravitational waves produced by chirality imbalance can be detected by LISA, Taiji and DECIGO, with the peak energy density locating in the range of $10^{-11}$ to $10^{-9}$ and the peak frequencies lying in the range of $10^{-5}$ Hz to $10^{-2}$ Hz. The spectrum with larger axial vector coupling strength and stronger magnetic field has higher peak energy density and lower peak frequency. According to this trend, the gravitational waves spectra might also be able to be detected by SKA, IPTA and EPTA. The Phase transition inverse duration $\beta/H_*$ calculated from the bounce solution is in the order of $10^4$, which is much higher than typical value $10-100$ from electroweak phase transitions. Based on the mechanism of postponement of the false vacuum decay, it is found that the formation of the primordial black hole is not favored because the phase transition completes in an extreme short time due to the large value of $\beta/H_*$ and thus the false vacuum energy density decays sharply. |
1111.0273 | Latham Boyle | Latham Boyle, Shane Farnsworth, Joseph Fitzgerald and Maitagorri
Schade (Perimeter Institute) | The Minimal Dimensionless Standard Model (MDSM) and its Cosmology | 28 pages, 2 figures, references added, typos fixed | null | null | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Consider the minimal renormalizable extension of the Standard Model with
purely dimensionless couplings, successful electroweak symmetry breaking (via
the Coleman-Weinberg mechanism) and a see-saw mechanism for neutrino mass: we
will call this the Minimal Dimensionless Standard Model (MDSM). In fact, 3
closely related models fit the bill: MDSM_1, MDSM_2 and MDSM_3. We analyze the
theoretical and observational constraints on these models. We argue that, when
they are minimally coupled to gravity, they can accomplish several important
cosmological tasks (inflation, dark matter, leptogenesis) in a way that is
economical, predictive and tightly woven into the fabric of known physics. One
of the models (MDSM_3), which includes an extra U(1)_{B-L} gauge symmetry,
seems particularly promising.
| [
{
"created": "Tue, 1 Nov 2011 19:00:52 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Mar 2013 05:02:55 GMT",
"version": "v2"
}
] | 2013-03-13 | [
[
"Boyle",
"Latham",
"",
"Perimeter Institute"
],
[
"Farnsworth",
"Shane",
"",
"Perimeter Institute"
],
[
"Fitzgerald",
"Joseph",
"",
"Perimeter Institute"
],
[
"Schade",
"Maitagorri",
"",
"Perimeter Institute"
]
] | Consider the minimal renormalizable extension of the Standard Model with purely dimensionless couplings, successful electroweak symmetry breaking (via the Coleman-Weinberg mechanism) and a see-saw mechanism for neutrino mass: we will call this the Minimal Dimensionless Standard Model (MDSM). In fact, 3 closely related models fit the bill: MDSM_1, MDSM_2 and MDSM_3. We analyze the theoretical and observational constraints on these models. We argue that, when they are minimally coupled to gravity, they can accomplish several important cosmological tasks (inflation, dark matter, leptogenesis) in a way that is economical, predictive and tightly woven into the fabric of known physics. One of the models (MDSM_3), which includes an extra U(1)_{B-L} gauge symmetry, seems particularly promising. |
1702.05753 | Sara Khatibi | Hamzeh Khanpour, Sara Khatibi, Mojtaba Mohammadi Najafabadi | Probing Higgs boson couplings in H+$\gamma$ production at the LHC | 17 pages, 7 figures, 3 tables, Updated to match published version | Phys.Lett. B773 (2017) 462-469 | 10.1016/j.physletb.2017.09.005 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we examine the potential of Higgs boson production associated
with a photon at the LHC to probe the new physics effects in the framework of
the standard model effective field theory. It is shown that the differential
kinematic distributions such as photon transverse momentum and invariant mass
of Higgs+$\gamma$ in Higgs associated production are powerful variables to
explore the coefficients of dimension six operators. The analysis is performed
in the decay channel of Higgs boson into a $b\bar{b}$ pair including the main
sources of background processes and a realistic simulation of the detector
effects. We provide constraints at $95\%$ confidence level on the Wilson
coefficients of dimension-six operators affecting Higgs boson plus a photon
production. We show to what extent these limits could be improved at the high
luminosity LHC. The effect of these constraints on a well-motivated beyond
standard model scenario is presented.
| [
{
"created": "Sun, 19 Feb 2017 14:21:34 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Sep 2017 12:49:30 GMT",
"version": "v2"
}
] | 2017-09-21 | [
[
"Khanpour",
"Hamzeh",
""
],
[
"Khatibi",
"Sara",
""
],
[
"Najafabadi",
"Mojtaba Mohammadi",
""
]
] | In this paper, we examine the potential of Higgs boson production associated with a photon at the LHC to probe the new physics effects in the framework of the standard model effective field theory. It is shown that the differential kinematic distributions such as photon transverse momentum and invariant mass of Higgs+$\gamma$ in Higgs associated production are powerful variables to explore the coefficients of dimension six operators. The analysis is performed in the decay channel of Higgs boson into a $b\bar{b}$ pair including the main sources of background processes and a realistic simulation of the detector effects. We provide constraints at $95\%$ confidence level on the Wilson coefficients of dimension-six operators affecting Higgs boson plus a photon production. We show to what extent these limits could be improved at the high luminosity LHC. The effect of these constraints on a well-motivated beyond standard model scenario is presented. |
0711.2890 | Howard E. Haber | Howard E. Haber and John D. Mason | Hard supersymmetry-breaking "wrong-Higgs" couplings of the MSSM | 34 pages, 3 axodraw figures and two tables in revtex format, with
additional references, a revised discussion of messenger parameters, and
typographical errors corrected. This is the version to be published by
Physical Review D (after a final set of typographical errors was discovered
and corrected) | Phys.Rev.D77:115011,2008 | 10.1103/PhysRevD.77.115011 | SCIPP-07/16 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the minimal supersymmetric extension of the Standard Model (MSSM), if the
two Higgs doublets are lighter than some subset of the superpartners of the
Standard Model particles, then it is possible to integrate out the heavy states
to obtain an effective broken-supersymmetric low-energy Lagrangian. This
Lagrangian can contain dimension-four gauge invariant Higgs interactions that
violate supersymmetry (SUSY). The "wrong-Higgs" Yukawa couplings generated by
one-loop radiative corrections are a well known example of this phenomenon. In
this paper, we examine gauge invariant gaugino--higgsino--Higgs boson
interactions that violate supersymmetry. Such wrong-Higgs gaugino couplings can
be generated in models of gauge-mediated SUSY-breaking in which some of the
messenger fields couple to the MSSM Higgs bosons. In regions of parameter space
where the messenger scale is low and tan(beta) is large, these hard
SUSY-breaking operators yield tan(beta)-enhanced corrections to tree-level
supersymmetric relations in the chargino and neutralino sectors that can be as
large as 20%. We demonstrate how physical observables in the chargino sector
can be used to isolate the tan(beta)-enhanced effects derived from the
wrong-Higgs gaugino operators.
| [
{
"created": "Mon, 19 Nov 2007 10:29:05 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Dec 2007 00:51:49 GMT",
"version": "v2"
},
{
"created": "Tue, 12 Feb 2008 00:24:53 GMT",
"version": "v3"
},
{
"created": "Wed, 14 May 2008 00:58:25 GMT",
"version": "v4"
},
{
"c... | 2008-11-26 | [
[
"Haber",
"Howard E.",
""
],
[
"Mason",
"John D.",
""
]
] | In the minimal supersymmetric extension of the Standard Model (MSSM), if the two Higgs doublets are lighter than some subset of the superpartners of the Standard Model particles, then it is possible to integrate out the heavy states to obtain an effective broken-supersymmetric low-energy Lagrangian. This Lagrangian can contain dimension-four gauge invariant Higgs interactions that violate supersymmetry (SUSY). The "wrong-Higgs" Yukawa couplings generated by one-loop radiative corrections are a well known example of this phenomenon. In this paper, we examine gauge invariant gaugino--higgsino--Higgs boson interactions that violate supersymmetry. Such wrong-Higgs gaugino couplings can be generated in models of gauge-mediated SUSY-breaking in which some of the messenger fields couple to the MSSM Higgs bosons. In regions of parameter space where the messenger scale is low and tan(beta) is large, these hard SUSY-breaking operators yield tan(beta)-enhanced corrections to tree-level supersymmetric relations in the chargino and neutralino sectors that can be as large as 20%. We demonstrate how physical observables in the chargino sector can be used to isolate the tan(beta)-enhanced effects derived from the wrong-Higgs gaugino operators. |
hep-ph/9512320 | Sean Fleming | Sean Fleming (University of Wisconsin Madison) and Ivan Maksymyk
(University of Texas Theory Group) | Hadronic $\psi$ production calculated in the NRQCD factorization
formalism | 25 pages, 3 postscript figures, use Revtex and epsfig.sty We fixed
some typos, added some text regarding a reference, and changed some
equations. The file will be available at http://phenom.physics.wisc.edu/ | Phys.Rev. D54 (1996) 3608-3618 | 10.1103/PhysRevD.54.3608 | MADPH-95-922 and UTTG-13-95 | hep-ph | null | The NRQCD factorization formalism of Bodwin, Braaten, and Lepage prescribes
how to write quarkonium production rates as a sum of products of short-distance
coefficients times non-perturbative long-distance NRQCD matrix elements. We
present, in the true spirit of the factorization formalism, a detailed
calculation of the inclusive cross section for hadronic $\psi$ production. We
find that in addition to the well known {\it color-singlet} production
mechanisms, there are equally important mechanisms in which the $c\bar{c}$ pair
that forms the $\psi$ is initially produced in a {\it color-octet} state, in
either a ${}^3S_1$, ${}^1S_0$, ${}^3P_0$ or ${}^3P_2$ angular-momentum
configuration. In our presentation, we emphasize the ``matching'' procedure,
which %is the method that allows us to determine the short-distance
coefficients appearing in the factorization formula. We also point out how one
may systematically include relativistic corrections in these calculations.
| [
{
"created": "Fri, 15 Dec 1995 03:15:30 GMT",
"version": "v1"
},
{
"created": "Fri, 22 Dec 1995 03:35:25 GMT",
"version": "v2"
},
{
"created": "Fri, 22 Dec 1995 20:11:47 GMT",
"version": "v3"
}
] | 2009-10-28 | [
[
"Fleming",
"Sean",
"",
"University of Wisconsin Madison"
],
[
"Maksymyk",
"Ivan",
"",
"University of Texas Theory Group"
]
] | The NRQCD factorization formalism of Bodwin, Braaten, and Lepage prescribes how to write quarkonium production rates as a sum of products of short-distance coefficients times non-perturbative long-distance NRQCD matrix elements. We present, in the true spirit of the factorization formalism, a detailed calculation of the inclusive cross section for hadronic $\psi$ production. We find that in addition to the well known {\it color-singlet} production mechanisms, there are equally important mechanisms in which the $c\bar{c}$ pair that forms the $\psi$ is initially produced in a {\it color-octet} state, in either a ${}^3S_1$, ${}^1S_0$, ${}^3P_0$ or ${}^3P_2$ angular-momentum configuration. In our presentation, we emphasize the ``matching'' procedure, which %is the method that allows us to determine the short-distance coefficients appearing in the factorization formula. We also point out how one may systematically include relativistic corrections in these calculations. |
1411.6459 | Daniel Pitonyak | K. Kanazawa, A. Metz, D. Pitonyak, M. Schlegel | Longitudinal-transverse double-spin asymmetries in single-inclusive
leptoproduction of hadrons | 14 pages, 7 figures, minor changes to the text, version to appear in
Phys. Lett. B | null | 10.1016/j.physletb.2015.02.005 | RBRC-1100 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the longitudinal-transverse double-spin asymmetry in
lepton-nucleon collisions where a single hadron is detected in the final state,
i.e., $\vec{\ell}\,N^\uparrow \rightarrow h\,X$. This is a subleading-twist
observable in collinear factorization, and we look at twist-3 effects in both
the transversely polarized nucleon and the unpolarized outgoing hadron. Results
are anticipated for this asymmetry from both HERMES and Jefferson Lab Hall A,
and it could be measured as well at COMPASS and a future Electron-Ion Collider.
We also perform a numerical study of the distribution term, which, when
compared to upcoming experimental results, could allow one to learn about the
"worm-gear"-type function $\tilde{g}(x)$ as well as assess the role of
quark-gluon-quark correlations in the initial-state nucleon and twist-3 effects
in the fragmenting unpolarized hadron.
| [
{
"created": "Mon, 24 Nov 2014 14:13:51 GMT",
"version": "v1"
},
{
"created": "Fri, 6 Feb 2015 16:10:08 GMT",
"version": "v2"
}
] | 2015-06-23 | [
[
"Kanazawa",
"K.",
""
],
[
"Metz",
"A.",
""
],
[
"Pitonyak",
"D.",
""
],
[
"Schlegel",
"M.",
""
]
] | We analyze the longitudinal-transverse double-spin asymmetry in lepton-nucleon collisions where a single hadron is detected in the final state, i.e., $\vec{\ell}\,N^\uparrow \rightarrow h\,X$. This is a subleading-twist observable in collinear factorization, and we look at twist-3 effects in both the transversely polarized nucleon and the unpolarized outgoing hadron. Results are anticipated for this asymmetry from both HERMES and Jefferson Lab Hall A, and it could be measured as well at COMPASS and a future Electron-Ion Collider. We also perform a numerical study of the distribution term, which, when compared to upcoming experimental results, could allow one to learn about the "worm-gear"-type function $\tilde{g}(x)$ as well as assess the role of quark-gluon-quark correlations in the initial-state nucleon and twist-3 effects in the fragmenting unpolarized hadron. |
hep-ph/0111069 | Seong-Chan park | Seong Chan Park and H.S.Song | Production of Spinning Black Holes at colliders | 9 pages, LaTeX, 1 eps Figures, reference added | J.Korean Phys.Soc.43:30-33,2003 | 10.3938/jkps.43.30 | SNUTP 01-038 | hep-ph | null | When the Planck scale is as low as TeV scale, there will be chances to
produce Black holes (BH's) at future colliders. Generally, BH's produced via
pariticle collisions could have non-zero angular momentum. We estimate the
production cross section of spinning and non-spinning BH's for future
colliders. Although the production cross section for the rotating BH is much
suppressed by angular momentum dependent factor, the total cross section could
be $\sim 2 -3$ times enhanced for the case of $\delta =4-6$.
| [
{
"created": "Wed, 7 Nov 2001 11:25:48 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Nov 2001 01:41:50 GMT",
"version": "v2"
}
] | 2010-11-19 | [
[
"Park",
"Seong Chan",
""
],
[
"Song",
"H. S.",
""
]
] | When the Planck scale is as low as TeV scale, there will be chances to produce Black holes (BH's) at future colliders. Generally, BH's produced via pariticle collisions could have non-zero angular momentum. We estimate the production cross section of spinning and non-spinning BH's for future colliders. Although the production cross section for the rotating BH is much suppressed by angular momentum dependent factor, the total cross section could be $\sim 2 -3$ times enhanced for the case of $\delta =4-6$. |
2407.13503 | Jun He Prof. | Zuo-Ming Ding, Qi Huang, Jun He | $X_0(2900)$ and $\chi_{c0}(3930)$ in process $B^+\to D^+ D^- K^+$ | 9 pages, 5figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This study investigates the nature of the $X_0(2900)$ and $\chi_{c0}(3930)$
based on experimental results of the process $B^+$$\to$$D^+ D^- K^+$. We focus
on the S-wave $D^{*-}K^{*+}$ and $D_s^+D_s^-$ molecular states, which can be
related to the $X_0(2900)$ and $\chi_{c0}(3930)$, respectively. Using effective
Lagrangians, we construct the potential kernel of the
$D^{*-}K^{*+}$$-$$D^{-}K^{+}$ and $D_s^+D_s^-$$-$$D^+D^-$ interactions with a
one-boson-exchange model, and determine the scattering amplitudes and their
poles through a quasipotential Bethe-Salpeter equation approach. By
incorporating the potential kernel into the three-body decay process
$B^+$$\to$$D^+ D^- K^+$, we evaluate the $D^-K^+$ and $D^+D^-$ invariant mass
spectra, as well as the Dalitz plot, with Monte Carlo simulation. A
satisfactory fit to the $D^-K^+$ and $D^+D^-$ invariant mass spectra is
achieved after introducing additional Breit-Wigner resonances, the $X_1(2900)$,
$\psi(3770)$, and $\chi_{c2}(3930)$ states. Prominent signals of the
$X_0(2900)$ and $\chi_{c0}(3930)$ states appear as peaks in the $D^-K^+$ and
$D^+D^-$ invariant mass spectra near 2900 and 3930 MeV, respectively. Clear
event concentration of the $X_0(2900)$ and $\chi_0(3930)$ states is evident as
strips in the Dalitz plot. The results suggest that both $X_0(2900)$ and
$\chi_{c0}(3930)$ can be interpreted as molecular states, with the inclusion of
$X_1(2900)$ and $\chi_2(3930)$ necessary to describe structures in the regions
near 2900 and 3930 MeV.
| [
{
"created": "Thu, 18 Jul 2024 13:35:04 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Aug 2024 04:14:30 GMT",
"version": "v2"
}
] | 2024-08-14 | [
[
"Ding",
"Zuo-Ming",
""
],
[
"Huang",
"Qi",
""
],
[
"He",
"Jun",
""
]
] | This study investigates the nature of the $X_0(2900)$ and $\chi_{c0}(3930)$ based on experimental results of the process $B^+$$\to$$D^+ D^- K^+$. We focus on the S-wave $D^{*-}K^{*+}$ and $D_s^+D_s^-$ molecular states, which can be related to the $X_0(2900)$ and $\chi_{c0}(3930)$, respectively. Using effective Lagrangians, we construct the potential kernel of the $D^{*-}K^{*+}$$-$$D^{-}K^{+}$ and $D_s^+D_s^-$$-$$D^+D^-$ interactions with a one-boson-exchange model, and determine the scattering amplitudes and their poles through a quasipotential Bethe-Salpeter equation approach. By incorporating the potential kernel into the three-body decay process $B^+$$\to$$D^+ D^- K^+$, we evaluate the $D^-K^+$ and $D^+D^-$ invariant mass spectra, as well as the Dalitz plot, with Monte Carlo simulation. A satisfactory fit to the $D^-K^+$ and $D^+D^-$ invariant mass spectra is achieved after introducing additional Breit-Wigner resonances, the $X_1(2900)$, $\psi(3770)$, and $\chi_{c2}(3930)$ states. Prominent signals of the $X_0(2900)$ and $\chi_{c0}(3930)$ states appear as peaks in the $D^-K^+$ and $D^+D^-$ invariant mass spectra near 2900 and 3930 MeV, respectively. Clear event concentration of the $X_0(2900)$ and $\chi_0(3930)$ states is evident as strips in the Dalitz plot. The results suggest that both $X_0(2900)$ and $\chi_{c0}(3930)$ can be interpreted as molecular states, with the inclusion of $X_1(2900)$ and $\chi_2(3930)$ necessary to describe structures in the regions near 2900 and 3930 MeV. |
0905.4942 | Jorge Mond\'ejar | Jorge Mondejar | Effective lagrangians for light-light interaction with a background
field | 4 pages, presented at the Lake Louise Winter Institute 2009 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We address the issue of light-light scattering in the presence of a
background field at low energies using effective lagrangians. We derive the
Euler-Heisenberg lagrangian at one loop and modify it to incorporate the case
of the interaction with a background field.
| [
{
"created": "Fri, 29 May 2009 18:48:55 GMT",
"version": "v1"
}
] | 2009-06-01 | [
[
"Mondejar",
"Jorge",
""
]
] | We address the issue of light-light scattering in the presence of a background field at low energies using effective lagrangians. We derive the Euler-Heisenberg lagrangian at one loop and modify it to incorporate the case of the interaction with a background field. |
hep-ph/0009268 | Stefan Recksiegel | Thomas Mannel and Stefan Recksiegel | Radiatively corrected shape function for inclusive heavy hadron decays | LaTeX, uses a4, graphicx and psfrag, 10 pages. The complete paper is
also available at http://www-ttp.physik.uni-karlsruhe.de/Preprints/ | Phys.Rev. D63 (2001) 094011 | 10.1103/PhysRevD.63.094011 | TTP 00-21 | hep-ph | null | We discuss the non-perturbative and the radiative corrections to inclusive B
decays from the point of view known from QED corrections to high energy e^+ e^-
processes. Here the leading contributions can be implemented through the so
called ``radiator function'' which corresponds to the shape function known in
heavy hadron decays. In this way some new insight into the origin of the shape
function is obtained. As a byproduct, a parameterization of the radiatively
corrected shape function is suggested which can be implemented in Monte Carlo
studies of inclusive heavy hadron decays.
| [
{
"created": "Fri, 22 Sep 2000 13:33:11 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Mannel",
"Thomas",
""
],
[
"Recksiegel",
"Stefan",
""
]
] | We discuss the non-perturbative and the radiative corrections to inclusive B decays from the point of view known from QED corrections to high energy e^+ e^- processes. Here the leading contributions can be implemented through the so called ``radiator function'' which corresponds to the shape function known in heavy hadron decays. In this way some new insight into the origin of the shape function is obtained. As a byproduct, a parameterization of the radiatively corrected shape function is suggested which can be implemented in Monte Carlo studies of inclusive heavy hadron decays. |
2306.08844 | Jorge Igor Jaber-Urquiza | Gabriella Piccinelli and Angel Sanchez and Jorge Jaber-Urquiza | Particle interaction strengths modified by magnetic fields | 9 pages, 3 figures | null | null | null | hep-ph | http://creativecommons.org/licenses/by-nc-sa/4.0/ | Magnetic fields are everywhere in the Universe and in our everyday life and
many processes are affected by their presence, generating a rich phenomenology
that depends also on other possible external agents. We review here some
results, both from our workgroup and from other research groups, about the
effect of magnetic fields on particles interaction processes, focusing mainly
on recent results, but without losing sight on early seminal works on this
topic. A vast assortment of physical situations and of analytical and numerical
approaches can be found in the literature in this subject, making the
comparison between them not straightforward. Our aim is to focus attention on
differences and similarities between the different situations and approaches,
looking for a systematization scheme that could be predictive, once the role
played by each physical ingredient could be understood. The main purpose of
this work is to find some physical explanations of the ongoing processes.
| [
{
"created": "Thu, 15 Jun 2023 04:17:59 GMT",
"version": "v1"
}
] | 2023-06-16 | [
[
"Piccinelli",
"Gabriella",
""
],
[
"Sanchez",
"Angel",
""
],
[
"Jaber-Urquiza",
"Jorge",
""
]
] | Magnetic fields are everywhere in the Universe and in our everyday life and many processes are affected by their presence, generating a rich phenomenology that depends also on other possible external agents. We review here some results, both from our workgroup and from other research groups, about the effect of magnetic fields on particles interaction processes, focusing mainly on recent results, but without losing sight on early seminal works on this topic. A vast assortment of physical situations and of analytical and numerical approaches can be found in the literature in this subject, making the comparison between them not straightforward. Our aim is to focus attention on differences and similarities between the different situations and approaches, looking for a systematization scheme that could be predictive, once the role played by each physical ingredient could be understood. The main purpose of this work is to find some physical explanations of the ongoing processes. |
2004.12841 | Jun Jiang | Eric Braaten, Li-Ping He, Kevin Ingles and Jun Jiang | Charm-meson Triangle Singularity in ${e^+e^-}$ Annihilation into ${
D^{*0} \bar{D}^0 + \gamma }$ | 29 pages and 15 figures | null | 10.1103/PhysRevD.101.096020 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the cross section for $e^+ e^-$ annihilation into $D^{*0} \bar
D^0 +\gamma$ at center-of-mass energies near the $D^{*0} \bar D^{*0}$ threshold
under the assumption that $X(3872)$ is a weakly bound charm meson molecule. The
Dalitz plot has a $\bar D^{*0}$ resonance band in the squared invariant mass
$t$ of $\bar D^0 \gamma$. In the limit as the decay width of the $D^{*0}$ goes
to 0, the Dalitz plot also has a narrow band in the squared invariant mass $u$
of $D^{*0} \bar D^0$ from a charm-meson triangle singularity. At the physical
value of the $D^{*0}$ width, the narrow band reduces to a shoulder. Thus the
triangle singularity cannot be observed directly as a peak in a differential
cross section as a function of $u$. It may however be observed indirectly as a
local minimum in the $t$ distribution for events with $u$ below the triangle
singularity. The minimum is produced by the Schmid cancellation between
triangle loop diagrams and a tree diagram. The observation of this minimum
would support the identification of $X(3872)$ as a weakly bound charm meson
molecule.
| [
{
"created": "Mon, 27 Apr 2020 14:43:38 GMT",
"version": "v1"
}
] | 2020-06-24 | [
[
"Braaten",
"Eric",
""
],
[
"He",
"Li-Ping",
""
],
[
"Ingles",
"Kevin",
""
],
[
"Jiang",
"Jun",
""
]
] | We calculate the cross section for $e^+ e^-$ annihilation into $D^{*0} \bar D^0 +\gamma$ at center-of-mass energies near the $D^{*0} \bar D^{*0}$ threshold under the assumption that $X(3872)$ is a weakly bound charm meson molecule. The Dalitz plot has a $\bar D^{*0}$ resonance band in the squared invariant mass $t$ of $\bar D^0 \gamma$. In the limit as the decay width of the $D^{*0}$ goes to 0, the Dalitz plot also has a narrow band in the squared invariant mass $u$ of $D^{*0} \bar D^0$ from a charm-meson triangle singularity. At the physical value of the $D^{*0}$ width, the narrow band reduces to a shoulder. Thus the triangle singularity cannot be observed directly as a peak in a differential cross section as a function of $u$. It may however be observed indirectly as a local minimum in the $t$ distribution for events with $u$ below the triangle singularity. The minimum is produced by the Schmid cancellation between triangle loop diagrams and a tree diagram. The observation of this minimum would support the identification of $X(3872)$ as a weakly bound charm meson molecule. |
1905.04558 | Eric Braaten | Eric Braaten and Daekyoung Kang and Ranjan Laha | Dark Matter Bound States from Three-Body Recombination | 5 pages, 3 figures, presented at 22nd International Conference on
Few-Body Problems in Physics in July 2018 in Caen, France | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The small-scale structure problems of the universe can be solved by
self-interacting dark matter that becomes strongly interacting at low energies.
A particularly predictive model is resonant short-range self-interactions, with
a dark-matter mass of about 19 GeV and a large S-wave scattering length of
about 17 fm. Such a model makes definite predictions for the few-body physics
of weakly bound clusters of the dark-matter particles. We calculate the
production of two-body bound clusters by three-body recombination in the early
universe under the assumption that the dark matter particles are identical
bosons, which is the most favorable case for forming larger clusters. The
fraction of dark matter in the form of two-body bound clusters can increase by
as much as 4 orders of magnitude when the dark-matter temperature falls below
the binding energy, but its present value remains less than 10^(-6).
| [
{
"created": "Sat, 11 May 2019 17:37:45 GMT",
"version": "v1"
}
] | 2019-05-14 | [
[
"Braaten",
"Eric",
""
],
[
"Kang",
"Daekyoung",
""
],
[
"Laha",
"Ranjan",
""
]
] | The small-scale structure problems of the universe can be solved by self-interacting dark matter that becomes strongly interacting at low energies. A particularly predictive model is resonant short-range self-interactions, with a dark-matter mass of about 19 GeV and a large S-wave scattering length of about 17 fm. Such a model makes definite predictions for the few-body physics of weakly bound clusters of the dark-matter particles. We calculate the production of two-body bound clusters by three-body recombination in the early universe under the assumption that the dark matter particles are identical bosons, which is the most favorable case for forming larger clusters. The fraction of dark matter in the form of two-body bound clusters can increase by as much as 4 orders of magnitude when the dark-matter temperature falls below the binding energy, but its present value remains less than 10^(-6). |
hep-ph/0008007 | Francisco Jose Yndurain | F. J. Yndurain | QCD Calculations of Heavy Quarkonium States | PlainTex file; one figure | Nucl.Phys.Proc.Suppl.93:196-202,2001 | 10.1016/S0920-5632(00)01102-6 | FTUAM-00-18 | hep-ph | null | Recent results on the QCD analysis of bound states of heavy $\bar{q}q$ quarks
are reviewed, paying attention to what can be derived from the theory with a
reasonable degree of rigour. We report a calculation of $\bar{b}c$ bound
states; a very precise evaluation of $b, c$ quark masses from quarkonium
spectrum; the NNLO evaluation of $\Upsilon\to e^+e^-$; and a discussion of
power corrections. For the $b$ quark {\sl pole} mass we get, including
$O(m_c^2/m_b^2)$ and $O(\alpha_s^5\log \alpha_s)$ corrections,
$m_b=5.020\pm0.058 GeV$; and for the $\bar{MS}$ mass the result, correct to
$O(\alpha_s^3)$, $O(m_c^2/m_b^2)$, $\bar{m}_b(\bar{m}_b)=4.286\pm0.036 GeV$.
For the decay $\Upsilon\to e^+e^-$, higher corrections are too large to permit
a reliable calculation, but we can predict a toponium width of $13\pm1 keV$.
| [
{
"created": "Tue, 1 Aug 2000 10:31:38 GMT",
"version": "v1"
}
] | 2011-01-27 | [
[
"Yndurain",
"F. J.",
""
]
] | Recent results on the QCD analysis of bound states of heavy $\bar{q}q$ quarks are reviewed, paying attention to what can be derived from the theory with a reasonable degree of rigour. We report a calculation of $\bar{b}c$ bound states; a very precise evaluation of $b, c$ quark masses from quarkonium spectrum; the NNLO evaluation of $\Upsilon\to e^+e^-$; and a discussion of power corrections. For the $b$ quark {\sl pole} mass we get, including $O(m_c^2/m_b^2)$ and $O(\alpha_s^5\log \alpha_s)$ corrections, $m_b=5.020\pm0.058 GeV$; and for the $\bar{MS}$ mass the result, correct to $O(\alpha_s^3)$, $O(m_c^2/m_b^2)$, $\bar{m}_b(\bar{m}_b)=4.286\pm0.036 GeV$. For the decay $\Upsilon\to e^+e^-$, higher corrections are too large to permit a reliable calculation, but we can predict a toponium width of $13\pm1 keV$. |
hep-ph/9912434 | Yu. A. Simonov | A. B. Kaidalov, Yu. A. Simonov (ITEP, Moscow) | Glueball masses and Pomeron trajectory in nonperturbative QCD | 13 pages, 1 EPS figure included using epsf.sty; minor changes in the
text and table, figure is replaced | Phys.Lett. B477 (2000) 163-170 | 10.1016/S0370-2693(00)00202-1 | null | hep-ph | null | Using a nonperturbative method based on asymptotic behaviour of Wilson loops
we calculate masses of glueballs and corresponding Regge-trajectories. The
method contains no fitting parameters and the mass scale is fixed by the meson
Regge slope. Theoretical predictions for lowest glueball states are in a
perfect agreement with lattice results. The leading glueball trajectory and its
relation to the Pomeron is discussed in details. Important role of mixing
between glueball and q\bar q trajectories is emphasized.
| [
{
"created": "Tue, 21 Dec 1999 00:32:14 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Feb 2000 16:10:34 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Kaidalov",
"A. B.",
"",
"ITEP, Moscow"
],
[
"Simonov",
"Yu. A.",
"",
"ITEP, Moscow"
]
] | Using a nonperturbative method based on asymptotic behaviour of Wilson loops we calculate masses of glueballs and corresponding Regge-trajectories. The method contains no fitting parameters and the mass scale is fixed by the meson Regge slope. Theoretical predictions for lowest glueball states are in a perfect agreement with lattice results. The leading glueball trajectory and its relation to the Pomeron is discussed in details. Important role of mixing between glueball and q\bar q trajectories is emphasized. |
2005.11049 | Mikhail Braun | M.A.Braun | Evolution of pomeron and odderon at all angular momemnta | 16 pages, 13 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the QCD the small~$x$ evolution of the interacting pomerons and odderons
is studied with all angular momenta $l$ taken into account. The resulting
system of coupled nonlinear evolution equations is formulated in the momentum
space and solved numerically. Excellent convergence in $l$ is observed. Also it
is found that states with $l>1$ play an important role and substantially reduce
the basic pomeron state at large rapidities
| [
{
"created": "Fri, 22 May 2020 08:11:22 GMT",
"version": "v1"
}
] | 2020-05-25 | [
[
"Braun",
"M. A.",
""
]
] | In the QCD the small~$x$ evolution of the interacting pomerons and odderons is studied with all angular momenta $l$ taken into account. The resulting system of coupled nonlinear evolution equations is formulated in the momentum space and solved numerically. Excellent convergence in $l$ is observed. Also it is found that states with $l>1$ play an important role and substantially reduce the basic pomeron state at large rapidities |
1205.3499 | David McKeen | Patrick deNiverville, David McKeen, Adam Ritz | Signatures of sub-GeV dark matter beams at neutrino experiments | 18 pages, 13 figures, revtex4-1 | Phys.Rev.D86:035022,2012 | 10.1103/PhysRevD.86.035022 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the high-luminosity fixed-target neutrino experiments at MiniBooNE,
MINOS and T2K and analyze their sensitivity to light stable states, focusing on
MeV--GeV scale dark matter. Thermal relic dark matter scenarios in the sub-GeV
mass range require the presence of light mediators, whose coupling to the
Standard Model facilitates annihilation in the early universe and allows for
the correct thermal relic abundance. The mediators in turn provide a production
channel for dark matter at colliders or fixed targets, and as a consequence the
neutrino beams generated at fixed targets may contain an additional beam of
light dark matter. The signatures of this beam include elastic scattering off
electrons or nucleons in the (near-)detector, which closely mimics the neutral
current scattering of neutrinos. We determine the event rate at modern fixed
target facilities and the ensuing sensitivity to sub-GeV dark matter.
| [
{
"created": "Tue, 15 May 2012 20:00:59 GMT",
"version": "v1"
}
] | 2012-09-04 | [
[
"deNiverville",
"Patrick",
""
],
[
"McKeen",
"David",
""
],
[
"Ritz",
"Adam",
""
]
] | We study the high-luminosity fixed-target neutrino experiments at MiniBooNE, MINOS and T2K and analyze their sensitivity to light stable states, focusing on MeV--GeV scale dark matter. Thermal relic dark matter scenarios in the sub-GeV mass range require the presence of light mediators, whose coupling to the Standard Model facilitates annihilation in the early universe and allows for the correct thermal relic abundance. The mediators in turn provide a production channel for dark matter at colliders or fixed targets, and as a consequence the neutrino beams generated at fixed targets may contain an additional beam of light dark matter. The signatures of this beam include elastic scattering off electrons or nucleons in the (near-)detector, which closely mimics the neutral current scattering of neutrinos. We determine the event rate at modern fixed target facilities and the ensuing sensitivity to sub-GeV dark matter. |
1701.08250 | Satendra Kumar | Sher Alam, Subhasish Behera, Satendra Kumar and Shibananda Sahoo | Constraining capability of $Z \gamma h$ production at the ILC | 18 pages, 44 figures. arXiv admin note: substantial text overlap with
arXiv:1501.03283 | null | 10.1142/S0217751X17500178 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Higgs boson couplings with gauge bosons are probed through $e^-e^+
\rightarrow Z \gamma h$ in an effective Lagrangian framework. For this study
the beam polarization facility at the ILC along with the typical center-of-mass
energy of 500 GeV is considered. The reach of the ILC with an integrated
luminosity of 300 fb$^{-1}$ in the determination of $CP$-conserving parameters
is obtained. Sensitivity of the probe of each of these couplings in the
presence of other couplings is investigated. The most influential coupling
parameters are $\bar c_W=-\bar c_B$. Other parameters of significant effect are
$\bar c_{HW}$ and $\bar c_{HB}$. A detailed study of the various kinematic
distributions represents possibilities to disentangle the effect of some of
these couplings.
| [
{
"created": "Sat, 28 Jan 2017 05:03:31 GMT",
"version": "v1"
},
{
"created": "Wed, 1 Feb 2017 11:39:03 GMT",
"version": "v2"
}
] | 2019-03-20 | [
[
"Alam",
"Sher",
""
],
[
"Behera",
"Subhasish",
""
],
[
"Kumar",
"Satendra",
""
],
[
"Sahoo",
"Shibananda",
""
]
] | Higgs boson couplings with gauge bosons are probed through $e^-e^+ \rightarrow Z \gamma h$ in an effective Lagrangian framework. For this study the beam polarization facility at the ILC along with the typical center-of-mass energy of 500 GeV is considered. The reach of the ILC with an integrated luminosity of 300 fb$^{-1}$ in the determination of $CP$-conserving parameters is obtained. Sensitivity of the probe of each of these couplings in the presence of other couplings is investigated. The most influential coupling parameters are $\bar c_W=-\bar c_B$. Other parameters of significant effect are $\bar c_{HW}$ and $\bar c_{HB}$. A detailed study of the various kinematic distributions represents possibilities to disentangle the effect of some of these couplings. |
1512.08651 | Antonio Costantini | Priyotosh Bandyopadhyay, Claudio Coriano, Antonio Costantini | General Analysis of the Charged Higgs Sector of the $Y=0$
Triplet-Singlet Extension of the MSSM at the LHC | 31 pages and 53 figures, figures added and edited, title changed,
comments added, version published on Phys. Rev. D (2016) | Phys. Rev. D 94, 055030 (2016) | 10.1103/PhysRevD.94.055030 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the extended Higgs sectors, specially the charged Higgs sector
in a supersymmetric $Y=0$ $SU(2)$ triplet and a Standard Model (SM) gauge
singlet extension of SM. We show that in this model the allowed data for the
Higgs boson interaction eigenstates tend to group into separate blocks for
$SU(2)$ triplet, doublet and singlet. The triplet sector has two degenerate
paired states, each pair composed of a mostly-triplet charged Higgs and of a
mostly-triplet scalar or pseudoscalar state. The mostly-doublet sector involves
a Standard Model like Higgs of 125 GeV and extra mass-degenerate states,
composed of a charged, a scalar and a pseudoscalar. The CP-odd component of the
singlet scalar, after supersymmetry breaking, takes the role of a
pseudo-Nambu-Goldstone mode in the $Z_3$ symmetric case, while the CP-even one
becomes decoupled. In a second part of our study we investigate the different
decay processes allowed to a charged Higgs boson of this model. Specifically,
we search for general signatures of the TNMSSM in order to distinguish among
Higgs fields belonging to $SU(2)$ doublet, triplet and singlet representations
at the LHC. We also propose few golden plated final state modes carrying the
distinctive signatures of this model which could be investigated in collider
searches. We also show how in the decoupling limit of the triplet ($|\lambda_T|
\simeq 0$) affects the decays as well as the production channels at the LHC.
| [
{
"created": "Tue, 29 Dec 2015 11:13:21 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Jan 2016 13:28:06 GMT",
"version": "v2"
},
{
"created": "Fri, 15 Apr 2016 11:26:12 GMT",
"version": "v3"
},
{
"created": "Fri, 30 Sep 2016 17:19:24 GMT",
"version": "v4"
}
] | 2016-10-05 | [
[
"Bandyopadhyay",
"Priyotosh",
""
],
[
"Coriano",
"Claudio",
""
],
[
"Costantini",
"Antonio",
""
]
] | We investigate the extended Higgs sectors, specially the charged Higgs sector in a supersymmetric $Y=0$ $SU(2)$ triplet and a Standard Model (SM) gauge singlet extension of SM. We show that in this model the allowed data for the Higgs boson interaction eigenstates tend to group into separate blocks for $SU(2)$ triplet, doublet and singlet. The triplet sector has two degenerate paired states, each pair composed of a mostly-triplet charged Higgs and of a mostly-triplet scalar or pseudoscalar state. The mostly-doublet sector involves a Standard Model like Higgs of 125 GeV and extra mass-degenerate states, composed of a charged, a scalar and a pseudoscalar. The CP-odd component of the singlet scalar, after supersymmetry breaking, takes the role of a pseudo-Nambu-Goldstone mode in the $Z_3$ symmetric case, while the CP-even one becomes decoupled. In a second part of our study we investigate the different decay processes allowed to a charged Higgs boson of this model. Specifically, we search for general signatures of the TNMSSM in order to distinguish among Higgs fields belonging to $SU(2)$ doublet, triplet and singlet representations at the LHC. We also propose few golden plated final state modes carrying the distinctive signatures of this model which could be investigated in collider searches. We also show how in the decoupling limit of the triplet ($|\lambda_T| \simeq 0$) affects the decays as well as the production channels at the LHC. |
1911.09717 | Hee Jung Kim | Ayuki Kamada, Hee Jung Kim | Escalating core formation with dark matter self-heating | 6+4 pages, 6 figures | Phys. Rev. D 102, 043009 (2020) | 10.1103/PhysRevD.102.043009 | null | hep-ph astro-ph.CO astro-ph.GA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Exothermic scatterings of dark matter (DM) produce DM particles with
significant kick velocities inside DM halos. In collaboration with DM
self-interaction, the excess kinetic energy of the produced DM particles is
distributed to the others, which self-heats the DM particles as a whole. The DM
self-heating is efficient towards the halo center, and the heat injection is
used to enhance the formation of a uniform density core inside halos. The
effect of DM self-heating is expected to be more significant in smaller halos
for two reasons: 1) the exothermic cross section times the relative velocity,
$\left\langle\sigma_{\rm exo}v_{\rm rel}\right\rangle$, is constant; 2) and the
ratio of the injected heat to the velocity dispersion squared gets larger
towards smaller halos. For the first time, we quantitatively investigate the
core formation from DM self-heating for halos in a wide mass range
($10^{9}$-$10^{15}\,{\rm M}_\odot$) using the gravothermal fluid formalism.
Notably, we demonstrate that the core formation is sharply escalating towards
smaller halos by taking the self-heating DM (i.e., DM that semi-annihilates and
self-interacts) as an example. We show that the sharp escalation of core
formation may cause a tension in simultaneously explaining the observed central
mass deficit of Milky Way satellites, and field dwarf/low surface brightness
spiral galaxies. While the details of the self-heating effect may differ among
models, we expect that the sharp halo-mass dependence of the core formation is
a general feature of exothermic DM.
| [
{
"created": "Thu, 21 Nov 2019 19:30:34 GMT",
"version": "v1"
}
] | 2020-08-19 | [
[
"Kamada",
"Ayuki",
""
],
[
"Kim",
"Hee Jung",
""
]
] | Exothermic scatterings of dark matter (DM) produce DM particles with significant kick velocities inside DM halos. In collaboration with DM self-interaction, the excess kinetic energy of the produced DM particles is distributed to the others, which self-heats the DM particles as a whole. The DM self-heating is efficient towards the halo center, and the heat injection is used to enhance the formation of a uniform density core inside halos. The effect of DM self-heating is expected to be more significant in smaller halos for two reasons: 1) the exothermic cross section times the relative velocity, $\left\langle\sigma_{\rm exo}v_{\rm rel}\right\rangle$, is constant; 2) and the ratio of the injected heat to the velocity dispersion squared gets larger towards smaller halos. For the first time, we quantitatively investigate the core formation from DM self-heating for halos in a wide mass range ($10^{9}$-$10^{15}\,{\rm M}_\odot$) using the gravothermal fluid formalism. Notably, we demonstrate that the core formation is sharply escalating towards smaller halos by taking the self-heating DM (i.e., DM that semi-annihilates and self-interacts) as an example. We show that the sharp escalation of core formation may cause a tension in simultaneously explaining the observed central mass deficit of Milky Way satellites, and field dwarf/low surface brightness spiral galaxies. While the details of the self-heating effect may differ among models, we expect that the sharp halo-mass dependence of the core formation is a general feature of exothermic DM. |
2101.10806 | Chen Bing | Bing Chen, Si-Qiang Luo and Xiang Liu | Universal behavior of mass gaps existing in the single heavy baryon
family | 11 pages, 7 tables and 1 figure | Eur. Phys. J. C 81, 474 (2021) | 10.1140/epjc/s10052-021-09234-1 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The mass gaps existing in the discovered single heavy flavor baryons are
analyzed, which show some universal behaviors. Under the framework of a
constituent quark model, we quantitatively explain why such interesting
phenomenon happens, when these established excited heavy baryons are regarded
as the $\lambda$-mode excitations. Based on the universal behaviors of the
discussed mass gaps, we may have three implications including the prediction of
the masses of excited $\Xi_b^0$ baryons which are still missing in the
experiment. For completeness, we also discuss the mass gaps of these
$\rho$-mode excited single heavy flavor baryons.
| [
{
"created": "Tue, 26 Jan 2021 14:31:13 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Jan 2021 12:28:13 GMT",
"version": "v2"
},
{
"created": "Sun, 30 May 2021 07:53:58 GMT",
"version": "v3"
}
] | 2021-06-01 | [
[
"Chen",
"Bing",
""
],
[
"Luo",
"Si-Qiang",
""
],
[
"Liu",
"Xiang",
""
]
] | The mass gaps existing in the discovered single heavy flavor baryons are analyzed, which show some universal behaviors. Under the framework of a constituent quark model, we quantitatively explain why such interesting phenomenon happens, when these established excited heavy baryons are regarded as the $\lambda$-mode excitations. Based on the universal behaviors of the discussed mass gaps, we may have three implications including the prediction of the masses of excited $\Xi_b^0$ baryons which are still missing in the experiment. For completeness, we also discuss the mass gaps of these $\rho$-mode excited single heavy flavor baryons. |
1110.5323 | John R. Hiller | J.R. Hiller, S.S. Chabysheva | A light-front coupled cluster method | 8 pages, 1 figure; to appear in the proceedings of LIGHTCONE 2011,
23-27 May 2011, Dallas | null | 10.1007/s00601-011-0268-z | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A new method for the nonperturbative solution of quantum field theories is
described. The method adapts the exponential-operator technique of the standard
many-body coupled-cluster method to the Fock-space eigenvalue problem for
light-front Hamiltonians. This leads to an effective eigenvalue problem in the
valence Fock sector and a set of nonlinear integral equations for the functions
that define the exponential operator. The approach avoids at least some of the
difficulties associated with the Fock-space truncation usually used.
| [
{
"created": "Mon, 24 Oct 2011 19:10:50 GMT",
"version": "v1"
}
] | 2015-05-30 | [
[
"Hiller",
"J. R.",
""
],
[
"Chabysheva",
"S. S.",
""
]
] | A new method for the nonperturbative solution of quantum field theories is described. The method adapts the exponential-operator technique of the standard many-body coupled-cluster method to the Fock-space eigenvalue problem for light-front Hamiltonians. This leads to an effective eigenvalue problem in the valence Fock sector and a set of nonlinear integral equations for the functions that define the exponential operator. The approach avoids at least some of the difficulties associated with the Fock-space truncation usually used. |
hep-ph/0601233 | Luca Silvestrini | M. Ciuchini, M. Pierini, L. Silvestrini | New Bounds On The CKM Matrix From B -> K pi pi Dalitz Plot Analyses | 5 pages, 1 figure. v2: extended discussion of electroweak penguins.
v3: error in the treatment of electroweak penguins corrected. v4: misprint
pointed out in hep-ph/0608243 corrected | Phys.Rev. D74 (2006) 051301 | 10.1103/PhysRevD.74.051301 | null | hep-ph | null | We present a new technique to extract information on the Unitarity Triangle
from the study of B -> K pi pi Dalitz plots. Using the sensitivity of Dalitz
analyses to the absolute values and the phases of decay amplitudes and isospin
symmetry, we obtain a new constraint on the elements of the CKM matrix. We
discuss in detail the role of electroweak penguins and outline future
prospects.
| [
{
"created": "Fri, 27 Jan 2006 16:54:20 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Feb 2006 13:44:31 GMT",
"version": "v2"
},
{
"created": "Fri, 23 Jun 2006 15:54:17 GMT",
"version": "v3"
},
{
"created": "Fri, 15 Sep 2006 14:35:54 GMT",
"version": "v4"
}
] | 2007-05-23 | [
[
"Ciuchini",
"M.",
""
],
[
"Pierini",
"M.",
""
],
[
"Silvestrini",
"L.",
""
]
] | We present a new technique to extract information on the Unitarity Triangle from the study of B -> K pi pi Dalitz plots. Using the sensitivity of Dalitz analyses to the absolute values and the phases of decay amplitudes and isospin symmetry, we obtain a new constraint on the elements of the CKM matrix. We discuss in detail the role of electroweak penguins and outline future prospects. |
hep-ph/0102068 | Eugene Golowich | Eugene Golowich and Sandip Pakvasa | Phenomenological Issues in the Determination of Delta Gamma_D | 15 pages | Phys.Lett. B505 (2001) 94-106 | 10.1016/S0370-2693(01)00325-2 | null | hep-ph hep-ex | null | We consider the issue of determining the D0-Dbar0 width difference Delta
Gamma_D experimentally. The current situation is reviewed and suggestions for
further study are given. We propose a number of D0 decay modes in addition to
those studied in the recent E791, FOCUS and BELLE lifetime determination
experiments. Then we address prospects for determining CF - CDS strong phase
differences, like delta_{K pi} which appears in the CLEO study of D0 -> K+ pi-
transitions. We show how to extract delta_{K* pi} with CDS data and furthermore
show when D -> K_L pi data becomes available, that delta_{K pi} can also be
obtained.
| [
{
"created": "Tue, 6 Feb 2001 19:26:09 GMT",
"version": "v1"
},
{
"created": "Sun, 18 Feb 2001 17:16:23 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Golowich",
"Eugene",
""
],
[
"Pakvasa",
"Sandip",
""
]
] | We consider the issue of determining the D0-Dbar0 width difference Delta Gamma_D experimentally. The current situation is reviewed and suggestions for further study are given. We propose a number of D0 decay modes in addition to those studied in the recent E791, FOCUS and BELLE lifetime determination experiments. Then we address prospects for determining CF - CDS strong phase differences, like delta_{K pi} which appears in the CLEO study of D0 -> K+ pi- transitions. We show how to extract delta_{K* pi} with CDS data and furthermore show when D -> K_L pi data becomes available, that delta_{K pi} can also be obtained. |
hep-ph/9412276 | Ed Stoeffhaas | V. Barger, R.J.N. Phillips, and D. Zeppenfeld | Minijet veto: a tool for the heavy Higgs search at the LHC | 18 pages, Revtex version 3 (can also run version 2). 3 postscript
figures included (using uufiles). Compressed postscript version with figures
available via anonymous ftp at
ftp://phenom.physics.wisc.edu/pub/preprints/current/madph-94-856.ps.Z | Phys.Lett.B346:106-114,1995 | 10.1016/0370-2693(95)00008-9 | MADPH-94-856 | hep-ph | null | The distinct color flow of the $qq\to qqH,\; H\to W^+W^-$ process leads to
suppressed radiation of soft gluons in the central region, a feature which is
not shared by major background processes like $t\bar t$ production or $q\bar q
\to W^+W^-$. For the leptonic decay of a heavy Higgs boson, $H\to W^+W^- \to
\ell^+\nu \ell^-\bar\nu$, it is shown that these backgrounds are typically
accompanied by minijet emission in the 20--40 GeV range. A central minijet veto
thus constitutes a powerful background rejection tool. It may be regarded as a
rapidity gap trigger at the semihard parton level which should work even at
high luminosities.
| [
{
"created": "Mon, 12 Dec 1994 22:04:56 GMT",
"version": "v1"
}
] | 2009-09-25 | [
[
"Barger",
"V.",
""
],
[
"Phillips",
"R. J. N.",
""
],
[
"Zeppenfeld",
"D.",
""
]
] | The distinct color flow of the $qq\to qqH,\; H\to W^+W^-$ process leads to suppressed radiation of soft gluons in the central region, a feature which is not shared by major background processes like $t\bar t$ production or $q\bar q \to W^+W^-$. For the leptonic decay of a heavy Higgs boson, $H\to W^+W^- \to \ell^+\nu \ell^-\bar\nu$, it is shown that these backgrounds are typically accompanied by minijet emission in the 20--40 GeV range. A central minijet veto thus constitutes a powerful background rejection tool. It may be regarded as a rapidity gap trigger at the semihard parton level which should work even at high luminosities. |
0806.3420 | Luis Anchordoqui | Luis A. Anchordoqui, Haim Goldberg, and Tomasz R. Taylor | Decay widths of lowest massive Regge excitations of open strings | 12 pages revtex, 1 eps figure | Phys.Lett.B668:373-377,2008 | 10.1016/j.physletb.2008.09.003 | LMU-ASC 36/08 | hep-ph astro-ph hep-ex hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | With the advent of the LHC there is widespread interest in the discovery
potential for physics beyond the standard model. In TeV-scale open string
theory, the new physics can be manifest in the excitation and decay of new
resonant structures, corresponding to Regge recurrences of standard model
particles. An essential input for the prediction of invariant mass spectra of
the decay products (which could serve to identify the resonance as a string
excitation) are the partial and total widths of the decay products. We present
a parameter-free calculation of these widths for the first Regge recurrence of
the SU(3) gluon octet, of the U(1) gauge boson which accompanies gluons in
D-brane constructions, and of the quark triplet.
| [
{
"created": "Fri, 20 Jun 2008 16:17:58 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Jul 2008 18:16:55 GMT",
"version": "v2"
}
] | 2010-04-30 | [
[
"Anchordoqui",
"Luis A.",
""
],
[
"Goldberg",
"Haim",
""
],
[
"Taylor",
"Tomasz R.",
""
]
] | With the advent of the LHC there is widespread interest in the discovery potential for physics beyond the standard model. In TeV-scale open string theory, the new physics can be manifest in the excitation and decay of new resonant structures, corresponding to Regge recurrences of standard model particles. An essential input for the prediction of invariant mass spectra of the decay products (which could serve to identify the resonance as a string excitation) are the partial and total widths of the decay products. We present a parameter-free calculation of these widths for the first Regge recurrence of the SU(3) gluon octet, of the U(1) gauge boson which accompanies gluons in D-brane constructions, and of the quark triplet. |
1804.09835 | Tong Li | Tong Li, Nobuchika Okada, Qaisar Shafi | Type II Seesaw with scalar dark matter in light of AMS-02, DAMPE and
Fermi-LAT | 16 pages, 3 figures, 3 tables | Phys. Rev. D 98, 055002 (2018) | 10.1103/PhysRevD.98.055002 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Standard Model (SM) supplemented by Type II Seesaw and a SM gauge-singlet
scalar dark matter (DM) is a very simple framework to incorporate the observed
neutrino oscillations and provide a plausible DM candidate. In this framework,
the scalar DM naturally has a leptophilic nature with a pair annihilating
mainly into the SM SU(2)$_L$ triplet Higgs scalar of Type II Seesaw which, in
turn, decay into leptons. In this work, we consider indirect signatures of this
leptophilic DM and examine the spectrum of the cosmic ray electron/positron
flux from DM pair annihilations in the Galactic halo. Given an astrophysical
background spectrum of the cosmic ray electron/positron flux, we find that the
contributions from DM annihilations can nicely fit the observed data from the
AMS-02, DAMPE and Fermi-LAT collaborations, with a multi-TeV range of DM mass
and a boost factor for the DM annihilation cross section of ${\cal O}(1000)$.
The boost factor has a slight tension with the Fermi-LAT data for gamma-ray
from dwarf spheroidal galaxies, which can be ameliorated with an enhanced local
DM density by a factor of about 2.
| [
{
"created": "Wed, 25 Apr 2018 23:39:09 GMT",
"version": "v1"
}
] | 2018-09-12 | [
[
"Li",
"Tong",
""
],
[
"Okada",
"Nobuchika",
""
],
[
"Shafi",
"Qaisar",
""
]
] | The Standard Model (SM) supplemented by Type II Seesaw and a SM gauge-singlet scalar dark matter (DM) is a very simple framework to incorporate the observed neutrino oscillations and provide a plausible DM candidate. In this framework, the scalar DM naturally has a leptophilic nature with a pair annihilating mainly into the SM SU(2)$_L$ triplet Higgs scalar of Type II Seesaw which, in turn, decay into leptons. In this work, we consider indirect signatures of this leptophilic DM and examine the spectrum of the cosmic ray electron/positron flux from DM pair annihilations in the Galactic halo. Given an astrophysical background spectrum of the cosmic ray electron/positron flux, we find that the contributions from DM annihilations can nicely fit the observed data from the AMS-02, DAMPE and Fermi-LAT collaborations, with a multi-TeV range of DM mass and a boost factor for the DM annihilation cross section of ${\cal O}(1000)$. The boost factor has a slight tension with the Fermi-LAT data for gamma-ray from dwarf spheroidal galaxies, which can be ameliorated with an enhanced local DM density by a factor of about 2. |
1309.0355 | Vo Quoc Phong | Vo Quoc Phong, Hoang Ngoc Long, Vo Thanh Van | Electroweak phase transition in the reduced minimal 3-3-1 model | 21 pages, 3 figures | Phys. Rev. D 88, 096009 (2013) | 10.1103/PhysRevD.88.096009 | null | hep-ph | http://creativecommons.org/licenses/by/3.0/ | The electroweak phase transition is considered in framework of the reduced
minimal 3-3-1 model (RM331). Structure of phase transition in this model is
divided into two periods. The first period is the phase transition SU(3) --->
SU(2) at TeV scale and the second one is SU(2)--> U(1), which is the
like-Standard Model electroweak phase transition. When mass of the neutral
Higgs boson (h_1) is taken to be equal to the LHC value: m_{h_1}=125 GeV, then
these phase transitions are the first order phase transitions, the mass of Z_2
is about 4.8 TeV; and we find the region of parameter space with the first
order phase transition at v_{\rho_0}=246 GeV scale, leading to an effective
potential, where mass of the charged Higgs boson is in range of 4.154 TeV <
m_{h_{++}} < 5.946 TeV. Therefore, with this approach, new bosons are the
triggers of the first order electroweak phase transition with significant
implications for the viability of electroweak baryogenesis scenarios.
| [
{
"created": "Mon, 2 Sep 2013 10:34:06 GMT",
"version": "v1"
},
{
"created": "Fri, 6 Sep 2013 07:58:32 GMT",
"version": "v2"
}
] | 2013-11-18 | [
[
"Phong",
"Vo Quoc",
""
],
[
"Long",
"Hoang Ngoc",
""
],
[
"Van",
"Vo Thanh",
""
]
] | The electroweak phase transition is considered in framework of the reduced minimal 3-3-1 model (RM331). Structure of phase transition in this model is divided into two periods. The first period is the phase transition SU(3) ---> SU(2) at TeV scale and the second one is SU(2)--> U(1), which is the like-Standard Model electroweak phase transition. When mass of the neutral Higgs boson (h_1) is taken to be equal to the LHC value: m_{h_1}=125 GeV, then these phase transitions are the first order phase transitions, the mass of Z_2 is about 4.8 TeV; and we find the region of parameter space with the first order phase transition at v_{\rho_0}=246 GeV scale, leading to an effective potential, where mass of the charged Higgs boson is in range of 4.154 TeV < m_{h_{++}} < 5.946 TeV. Therefore, with this approach, new bosons are the triggers of the first order electroweak phase transition with significant implications for the viability of electroweak baryogenesis scenarios. |
2004.00497 | Evgenij Martynov | E. Martynov and G. Tersimonov | Multigap diffraction cross sections. Problems in eikonal methods for the
pomeron unitarization | 8 pages, 6 figures. v2: Minor changes. Journal version. Journal-ref:
Phys. Rev. D 101, 114003 (2020) | Phys. Rev. D 101, 114003 (2020) | 10.1103/PhysRevD.101.114003 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Large rapidity gap diffraction processes are considered in multi-channel
eikonal models. It is shown that shadow corrections to over-fast rising
contribution of the input supercritical pomeron (with $\alpha(0)>1$),
originating from the pomeron rescatterings or, equivalently, accounting
survival probability factor, do not solve the Finkelstein-Kajantie problem.
Therefore, in our opinion, another methods of unitarization of supercritical
pomeron should be developed.
| [
{
"created": "Wed, 1 Apr 2020 15:16:24 GMT",
"version": "v1"
},
{
"created": "Sat, 6 Jun 2020 13:43:47 GMT",
"version": "v2"
}
] | 2020-07-01 | [
[
"Martynov",
"E.",
""
],
[
"Tersimonov",
"G.",
""
]
] | Large rapidity gap diffraction processes are considered in multi-channel eikonal models. It is shown that shadow corrections to over-fast rising contribution of the input supercritical pomeron (with $\alpha(0)>1$), originating from the pomeron rescatterings or, equivalently, accounting survival probability factor, do not solve the Finkelstein-Kajantie problem. Therefore, in our opinion, another methods of unitarization of supercritical pomeron should be developed. |
1307.4622 | Lianyi He | Tao Xia, Lianyi He, and Pengfei Zhuang | Three-flavor Nambu--Jona-Lasinio model at finite isospin chemical
potential | Version punlished in PRD | Phys. Rev. D 88, 056013 (2013) | 10.1103/PhysRevD.88.056013 | null | hep-ph hep-lat nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | QCD at finite isospin chemical potential $\mu_{\text I}$ possesses a
positively definite fermion determinant and the lattice simulation can be
successfully performed. While the two-flavor effective models may be sufficient
to describe the phenomenon of pion condensation, it is interesting to study the
roles of the strangeness degree of freedom and the U$_{\rm A}(1)$ anomaly. In
this paper, we present a systematic study of the three-flavor
Nambu--Jona-Lasinio model with a Kobayashi-Maskawa-'t Hooft (KMT) term that
mimics the U$_{\rm A}(1)$ anomaly at finite isospin chemical potential. In the
mean-field approximation, the model predicts a phase transition from the vacuum
to the pion superfluid phase, which takes place at $\mu_{\rm I}$ equal to the
pion mass $m_\pi$. Due to the U$_{\rm A}(1)$ anomaly, the strangeness degree of
freedom couples to the light quark degrees of freedom and the strange quark
effective mass depends on the pion condensate. However, the strange quark
condensate and the strange quark effective mass change slightly in the pion
superfluid phase, which verifies the validity of the two-flavor models. The
effective four-fermion interaction of the Kobayashi-Maskawa-'t Hooft term in
the presence of the pion condensation is constructed. Due to the U$_{\rm A}(1)$
anomaly, the pion condensation generally induces scalar-pseudoscalar
interaction. The Bethe-Salpeter equation for the mesonic excitations is
established and the meson mass spectra are obtained at finite isospin chemical
potential and temperature. Finally, the general expression for the topological
susceptibility $\chi$ at finite isospin chemical potential $\mu_{\rm I}$ is
derived. In contrast to the finite temperature effect which suppresses $\chi$,
the isospin density effect leads to an enhancement of $\chi$.
| [
{
"created": "Wed, 17 Jul 2013 13:33:25 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Sep 2013 20:37:23 GMT",
"version": "v2"
}
] | 2013-09-19 | [
[
"Xia",
"Tao",
""
],
[
"He",
"Lianyi",
""
],
[
"Zhuang",
"Pengfei",
""
]
] | QCD at finite isospin chemical potential $\mu_{\text I}$ possesses a positively definite fermion determinant and the lattice simulation can be successfully performed. While the two-flavor effective models may be sufficient to describe the phenomenon of pion condensation, it is interesting to study the roles of the strangeness degree of freedom and the U$_{\rm A}(1)$ anomaly. In this paper, we present a systematic study of the three-flavor Nambu--Jona-Lasinio model with a Kobayashi-Maskawa-'t Hooft (KMT) term that mimics the U$_{\rm A}(1)$ anomaly at finite isospin chemical potential. In the mean-field approximation, the model predicts a phase transition from the vacuum to the pion superfluid phase, which takes place at $\mu_{\rm I}$ equal to the pion mass $m_\pi$. Due to the U$_{\rm A}(1)$ anomaly, the strangeness degree of freedom couples to the light quark degrees of freedom and the strange quark effective mass depends on the pion condensate. However, the strange quark condensate and the strange quark effective mass change slightly in the pion superfluid phase, which verifies the validity of the two-flavor models. The effective four-fermion interaction of the Kobayashi-Maskawa-'t Hooft term in the presence of the pion condensation is constructed. Due to the U$_{\rm A}(1)$ anomaly, the pion condensation generally induces scalar-pseudoscalar interaction. The Bethe-Salpeter equation for the mesonic excitations is established and the meson mass spectra are obtained at finite isospin chemical potential and temperature. Finally, the general expression for the topological susceptibility $\chi$ at finite isospin chemical potential $\mu_{\rm I}$ is derived. In contrast to the finite temperature effect which suppresses $\chi$, the isospin density effect leads to an enhancement of $\chi$. |
1606.02969 | Dong-Won Jung | Hisaki Hatanaka, Dong-Won Jung and Pyungwon Ko | AdS/QCD approach to the scale-invariant extension of the standard model
with a strongly interacting hidden sector | minor corrections, version appeared in JHEP | JHEP08(2016)094 | 10.1007/JHEP08(2016)094 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we revisit a scale-invariant extension of the standard model
(SM) with a strongly interacting hidden sector within AdS/QCD approach. Using
the AdS/QCD, we reduce the number of input parameters to three, {\it i.e.}
hidden pion decay constant, hidden pion mass and $\tan\beta$ that is defined as
the ratio of the vacuum expectation values (VEV) of the singlet scalar field
and the SM Higgs boson. As a result, our model has sharp predictability. We
perform the phenomenological analysis of the hidden pions which is one of the
dark matter (DM) candidates in this model. With various theoretical and
experimental constraints we search for the allowed parameter space and find
that both resonance and non-resonance solutions are possible. Some typical
correlations among various observables such as thermal relic density of hidden
pions, Higgs boson signal strengths and DM-nucleon cross section are
investigated. We provide some benchmark points for experimental tests.
| [
{
"created": "Thu, 9 Jun 2016 14:07:29 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Aug 2016 05:28:43 GMT",
"version": "v2"
}
] | 2016-09-21 | [
[
"Hatanaka",
"Hisaki",
""
],
[
"Jung",
"Dong-Won",
""
],
[
"Ko",
"Pyungwon",
""
]
] | In this paper, we revisit a scale-invariant extension of the standard model (SM) with a strongly interacting hidden sector within AdS/QCD approach. Using the AdS/QCD, we reduce the number of input parameters to three, {\it i.e.} hidden pion decay constant, hidden pion mass and $\tan\beta$ that is defined as the ratio of the vacuum expectation values (VEV) of the singlet scalar field and the SM Higgs boson. As a result, our model has sharp predictability. We perform the phenomenological analysis of the hidden pions which is one of the dark matter (DM) candidates in this model. With various theoretical and experimental constraints we search for the allowed parameter space and find that both resonance and non-resonance solutions are possible. Some typical correlations among various observables such as thermal relic density of hidden pions, Higgs boson signal strengths and DM-nucleon cross section are investigated. We provide some benchmark points for experimental tests. |
0712.1288 | Takayuki Matsuki | Takayuki Matsuki, Toshiyuki Morii, and Kazutaka Sudoh | Study of Structure of the Mass Gap between Two Spin Multiplets | 8 pages, 2 figures, Invited talk given at the XII International
Conference on Hadron Spectroscopy (Hadron 07), Frascati, October 8-13, 2007 | null | null | null | hep-ph hep-ex | null | Studying our semirelativistic potential model and the numerical results,
which succeeds in predicting and reproducing recently discovered higher
resonances of $D$, $D_s$, $B$, and $B_s$, we find a simple expression for the
mass gap between two spin multiplets of heavy-light mesons, $(0^-,1^-)$ and
$(0^+,1^+)$. The mass gap between chiral partners defined by $\Delta
M=M(0^+)-M(0^-)$ and/or $M(1^+)-M(1^-)$ is given by $\Delta
M=M(0^+)-M(0^-)=M(1^+)-M(1^-)\approx \Lambda_{\rm Q}-m_q$ in the limit of heavy
quark symmetry. We also study the case including $1/m_Q$ corrections.
| [
{
"created": "Sat, 8 Dec 2007 15:45:51 GMT",
"version": "v1"
}
] | 2008-03-29 | [
[
"Matsuki",
"Takayuki",
""
],
[
"Morii",
"Toshiyuki",
""
],
[
"Sudoh",
"Kazutaka",
""
]
] | Studying our semirelativistic potential model and the numerical results, which succeeds in predicting and reproducing recently discovered higher resonances of $D$, $D_s$, $B$, and $B_s$, we find a simple expression for the mass gap between two spin multiplets of heavy-light mesons, $(0^-,1^-)$ and $(0^+,1^+)$. The mass gap between chiral partners defined by $\Delta M=M(0^+)-M(0^-)$ and/or $M(1^+)-M(1^-)$ is given by $\Delta M=M(0^+)-M(0^-)=M(1^+)-M(1^-)\approx \Lambda_{\rm Q}-m_q$ in the limit of heavy quark symmetry. We also study the case including $1/m_Q$ corrections. |
1712.05343 | Susana Coito | Susana Coito | Line-shape analysis of charmonium resonances | Proceedings of the Conference "Hadron 17", held on 25-29 September,
2017, in Salamanca, Spain | null | 10.22323/1.310.0030 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss weather the new enhancements found by BES, alias the $Y(4220)$,
$Y(4260)$, $Y(4360)$, and $Y(4390)$ are true resonances. We argue that the
nearby thresholds $D_s^*\bar{D}_s^*$, $D\bar{D}_1+\bar{D}D_1$,
$D_s\bar{D}_{s1}+\bar{D_s}D_{s1}$ and $D^*\bar{D}_1+\bar{D}^*D_1$, as well as
the $\psi(4160)$ and $\psi(4415)$ states have a strong influence over the
observed $ J/\psi \pi^+\pi^-$ and $h_c \pi^+\pi^-$ line-shapes. We propose an
unitarized effective Lagrangian model to study the dynamical effect of the
interaction between each known $\psi$ state and its closest thresholds. In
addition, we present some of our recent motivating results, using the same
model, for the $\psi(3770)$ resonance, where the distortion from a Breit-Wigner
line-shape is shown to result not only from the kinematic interference, but
also from the influence of the $D^0\bar{D}^0+D^+D^-$ one-loops. Moreover, two
poles were found, at about 3.78 GeV and at 3.74 GeV, the second one generated
dynamically, yet contributing to the distortion of the line-shape.
| [
{
"created": "Thu, 14 Dec 2017 17:19:36 GMT",
"version": "v1"
}
] | 2022-09-21 | [
[
"Coito",
"Susana",
""
]
] | We discuss weather the new enhancements found by BES, alias the $Y(4220)$, $Y(4260)$, $Y(4360)$, and $Y(4390)$ are true resonances. We argue that the nearby thresholds $D_s^*\bar{D}_s^*$, $D\bar{D}_1+\bar{D}D_1$, $D_s\bar{D}_{s1}+\bar{D_s}D_{s1}$ and $D^*\bar{D}_1+\bar{D}^*D_1$, as well as the $\psi(4160)$ and $\psi(4415)$ states have a strong influence over the observed $ J/\psi \pi^+\pi^-$ and $h_c \pi^+\pi^-$ line-shapes. We propose an unitarized effective Lagrangian model to study the dynamical effect of the interaction between each known $\psi$ state and its closest thresholds. In addition, we present some of our recent motivating results, using the same model, for the $\psi(3770)$ resonance, where the distortion from a Breit-Wigner line-shape is shown to result not only from the kinematic interference, but also from the influence of the $D^0\bar{D}^0+D^+D^-$ one-loops. Moreover, two poles were found, at about 3.78 GeV and at 3.74 GeV, the second one generated dynamically, yet contributing to the distortion of the line-shape. |
hep-ph/9310223 | Gour Bhattacharya | G. Bhattacharya, P. A. Kalyniak, and K. A. Peterson | Heavy Charged Lepton Pair Production Through Photon Fusion at Hadron
Supercolliders | To appear in the Proceedings of the Madison-Argonne Workshop on
Physics at Current Accelerators and the Supercollider, March - June 1993. 7
pages, Latex with epsfig and world_sci style files, 3 postscript figures
embedded in the text, submitted as a uuencoded file. OCIP/C-93-12 | null | null | null | hep-ph | null | The pair production of charged heavy leptons via two photon fusion is
considered for hadron collisions at SSC and LHC energies. Rates for the
inelastic process $pp \rightarrow \gamma \gamma X \rightarrow L^+L^-X$ and the
elastic process $pp \rightarrow \gamma \gamma pp \rightarrow L^+L^- pp$ are
given in a Weizs\"{a}cker-Williams approximation and compared with production
via the gluon fusion and Drell-Yan mechanisms
| [
{
"created": "Tue, 5 Oct 1993 02:17:54 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Bhattacharya",
"G.",
""
],
[
"Kalyniak",
"P. A.",
""
],
[
"Peterson",
"K. A.",
""
]
] | The pair production of charged heavy leptons via two photon fusion is considered for hadron collisions at SSC and LHC energies. Rates for the inelastic process $pp \rightarrow \gamma \gamma X \rightarrow L^+L^-X$ and the elastic process $pp \rightarrow \gamma \gamma pp \rightarrow L^+L^- pp$ are given in a Weizs\"{a}cker-Williams approximation and compared with production via the gluon fusion and Drell-Yan mechanisms |
0705.2961 | Kacper Zalewski | K. Zalewski | Relations between classical phase-space distributions and Wigner
function for multiparticle production processes | 13 pages, LaTeX, no figures | Acta Phys.Polon.B39:181-192,2008 | null | null | hep-ph | null | The effects of interpreting classical phase space distributions as Wigner
functions, which is common in models of multiparticle production, are
discussed. The temperature for the classical description is always higher than
that for its Wigner function interpretation. A rough estimate shows that the
corresponding correction is proportional to R^(-2), where R is the radius of
the interaction region, and that it is negligible for heavy ion scattering, but
at the few percent level for e^+e^- annihilations.
| [
{
"created": "Mon, 21 May 2007 12:41:08 GMT",
"version": "v1"
}
] | 2009-04-22 | [
[
"Zalewski",
"K.",
""
]
] | The effects of interpreting classical phase space distributions as Wigner functions, which is common in models of multiparticle production, are discussed. The temperature for the classical description is always higher than that for its Wigner function interpretation. A rough estimate shows that the corresponding correction is proportional to R^(-2), where R is the radius of the interaction region, and that it is negligible for heavy ion scattering, but at the few percent level for e^+e^- annihilations. |
2310.19916 | Francesco Giovanni Celiberto | Alessandro Bacchetta, Francesco Giovanni Celiberto, Marco Radici | Spectator-model studies for spin-dependent gluon TMD PDFs at the LHC and
EIC | 6 pages, 1 figure, presented by F.G. Celiberto at the European
Physical Society Conference on High Energy Physics (EPS-HEP) 2023, 20-25
August 2023, Universit\"at Hamburg | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present novel analyses on accessing the 3D gluon content of the proton via
spin-dependent TMD gluon densities, calculated through the spectator-model
approach. Our formalism embodies a fit-based spectator-mass modulation
function, suited to catch longitudinal-momentum effects in a wide kinematic
range. Particular attention is paid to the time-reversal even Boer--Mulders and
the time-reversal odd Sivers functions, whose accurate knowledge, needed to
perform precise 3D analyses of nucleons, motivates synergies between LHC and
EIC Communities.
| [
{
"created": "Mon, 30 Oct 2023 18:29:10 GMT",
"version": "v1"
}
] | 2023-11-01 | [
[
"Bacchetta",
"Alessandro",
""
],
[
"Celiberto",
"Francesco Giovanni",
""
],
[
"Radici",
"Marco",
""
]
] | We present novel analyses on accessing the 3D gluon content of the proton via spin-dependent TMD gluon densities, calculated through the spectator-model approach. Our formalism embodies a fit-based spectator-mass modulation function, suited to catch longitudinal-momentum effects in a wide kinematic range. Particular attention is paid to the time-reversal even Boer--Mulders and the time-reversal odd Sivers functions, whose accurate knowledge, needed to perform precise 3D analyses of nucleons, motivates synergies between LHC and EIC Communities. |
1406.4987 | Leonardo Giusti | Georg P. Engel, Leonardo Giusti, Stefano Lottini, Rainer Sommer | Chiral symmetry breaking in QCD Lite | 4 pages, 3 figures, 1 table | Phys. Rev. Lett. 114, 112001 (2015) | 10.1103/PhysRevLett.114.112001 | null | hep-ph hep-lat nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A distinctive feature of the presence of spontaneous chiral symmetry breaking
in QCD is the condensation of low modes of the Dirac operator near the origin.
The rate of condensation must be equal to the slope of (Mpi^2 Fpi^2)/2 with
respect to the quark mass m in the chiral limit, where Mpi and Fpi are the mass
and the decay constant of the Nambu-Goldstone bosons. We compute the spectral
density of the (Hermitian) Dirac operator, the quark mass, the pseudoscalar
meson mass and decay constant by numerical simulations of lattice QCD with two
light degenerate Wilson quarks. We use CLS lattices at three values of the
lattice spacing in the range 0.05-0.08 fm, and for several quark masses
corresponding to pseudoscalar mesons masses down to 190 MeV. Thanks to this
coverage of parameters space, we can extrapolate all quantities to the chiral
and continuum limits with confidence. The results show that the low quark modes
do condense in the continuum as expected by the Banks-Casher mechanism, and the
rate of condensation agrees with the Gell-Mann-Oakes-Renner (GMOR) relation.
For the renormalisation-group-invariant ratios we obtain [\Sigma^RGI]^(1/3)/F
=2.77(2)(4) and Lambda^MSbar/F = 3.6(2), which correspond to [\Sigma^\MSbar(2
GeV)]^(1/3) =263(3)(4) MeV and F=85.8(7)(20) MeV if FK is used to set the scale
by supplementing the theory with a quenched strange quark.
| [
{
"created": "Thu, 19 Jun 2014 09:24:25 GMT",
"version": "v1"
}
] | 2015-03-25 | [
[
"Engel",
"Georg P.",
""
],
[
"Giusti",
"Leonardo",
""
],
[
"Lottini",
"Stefano",
""
],
[
"Sommer",
"Rainer",
""
]
] | A distinctive feature of the presence of spontaneous chiral symmetry breaking in QCD is the condensation of low modes of the Dirac operator near the origin. The rate of condensation must be equal to the slope of (Mpi^2 Fpi^2)/2 with respect to the quark mass m in the chiral limit, where Mpi and Fpi are the mass and the decay constant of the Nambu-Goldstone bosons. We compute the spectral density of the (Hermitian) Dirac operator, the quark mass, the pseudoscalar meson mass and decay constant by numerical simulations of lattice QCD with two light degenerate Wilson quarks. We use CLS lattices at three values of the lattice spacing in the range 0.05-0.08 fm, and for several quark masses corresponding to pseudoscalar mesons masses down to 190 MeV. Thanks to this coverage of parameters space, we can extrapolate all quantities to the chiral and continuum limits with confidence. The results show that the low quark modes do condense in the continuum as expected by the Banks-Casher mechanism, and the rate of condensation agrees with the Gell-Mann-Oakes-Renner (GMOR) relation. For the renormalisation-group-invariant ratios we obtain [\Sigma^RGI]^(1/3)/F =2.77(2)(4) and Lambda^MSbar/F = 3.6(2), which correspond to [\Sigma^\MSbar(2 GeV)]^(1/3) =263(3)(4) MeV and F=85.8(7)(20) MeV if FK is used to set the scale by supplementing the theory with a quenched strange quark. |
2107.13001 | Marco Chianese Dr | Roberta Calabrese, Marco Chianese, Damiano F.G. Fiorillo, Ninetta
Saviano | Direct Detection of Light Dark Matter from Evaporating Primordial Black
Holes | 8 pages, 3 figures. v2: updated to published version | PRD 105, L021302, 2022 | 10.1103/PhysRevD.105.L021302 | null | hep-ph astro-ph.CO hep-ex hep-th | http://creativecommons.org/licenses/by/4.0/ | The direct detection of sub-GeV dark matter interacting with nucleons is
hampered by the low recoil energies induced by scatterings in the detectors.
This experimental difficulty is avoided in the scenario of boosted dark matter
where a component of dark matter particles is endowed with large kinetic
energies. In this Letter, we point out that the current evaporation of
primordial black holes with masses from $10^{14}$ to $10^{16}$ g is a source of
boosted light dark matter with energies of tens to hundreds of MeV. Focusing on
the XENON1T experiment, we show that these relativistic dark matter particles
could give rise to a signal orders of magnitude larger than the present upper
bounds. Therefore, we are able to significantly constrain the combined
parameter space of primordial black holes and sub-GeV dark matter. In the
presence of primordial black holes with a mass of $10^{15}~\mathrm{g}$ and an
abundance compatible with present bounds, the limits on DM-nucleon
cross-section are improved by four orders of magnitude.
| [
{
"created": "Tue, 27 Jul 2021 18:00:01 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Jan 2022 11:45:11 GMT",
"version": "v2"
}
] | 2022-01-07 | [
[
"Calabrese",
"Roberta",
""
],
[
"Chianese",
"Marco",
""
],
[
"Fiorillo",
"Damiano F. G.",
""
],
[
"Saviano",
"Ninetta",
""
]
] | The direct detection of sub-GeV dark matter interacting with nucleons is hampered by the low recoil energies induced by scatterings in the detectors. This experimental difficulty is avoided in the scenario of boosted dark matter where a component of dark matter particles is endowed with large kinetic energies. In this Letter, we point out that the current evaporation of primordial black holes with masses from $10^{14}$ to $10^{16}$ g is a source of boosted light dark matter with energies of tens to hundreds of MeV. Focusing on the XENON1T experiment, we show that these relativistic dark matter particles could give rise to a signal orders of magnitude larger than the present upper bounds. Therefore, we are able to significantly constrain the combined parameter space of primordial black holes and sub-GeV dark matter. In the presence of primordial black holes with a mass of $10^{15}~\mathrm{g}$ and an abundance compatible with present bounds, the limits on DM-nucleon cross-section are improved by four orders of magnitude. |
hep-ph/9808233 | O. Nachtmann | P. V. Landshoff, O. Nachtmann | Some Remarks on the Pomeron and the Odderon in Theory and Experiment | 12 pages, 4 figures | null | null | DAMTP-1998-99, HD-THEP-98-28 | hep-ph | null | On March 19-21, 1998, a workshop devoted to questions of the pomeron and the
odderon in high energy scattering was held in Heidelberg. This note gives a
personal account of some of the issues discussed at this workshop. Of course,
misconceptions and misunderstandings are to be blamed on us, not on the other
participants of the workshop. A puzzle of odderon physics is identified and a
convenient reaction for its experimental study is discussed.
| [
{
"created": "Wed, 5 Aug 1998 14:07:18 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Landshoff",
"P. V.",
""
],
[
"Nachtmann",
"O.",
""
]
] | On March 19-21, 1998, a workshop devoted to questions of the pomeron and the odderon in high energy scattering was held in Heidelberg. This note gives a personal account of some of the issues discussed at this workshop. Of course, misconceptions and misunderstandings are to be blamed on us, not on the other participants of the workshop. A puzzle of odderon physics is identified and a convenient reaction for its experimental study is discussed. |
1110.3976 | Manami Hashi | Manami Hashi and Noriaki Kitazawa | Signatures of low-scale string models at the LHC | 21 pages, 8 figures | JHEP 02 (2012) 050 | 10.1007/JHEP02(2012)050 | UT-Komaba/11-10 | hep-ph hep-ex hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Low-scale string models, in which the string scale M_s is of the order of TeV
with large extra dimensions, can solve the problems of scale hierarchy and
non-renormalizable quantum gravity in the standard model. String excited states
of the standard model particles are possibly observed as resonances in the
dijet invariant mass distribution at the LHC. There are two properties to
distinguish whether the resonances are due to low-scale string or some other
"new physics". One is a characteristic angular distribution in dijet events at
the resonance due to spin degeneracy of string excited states, and the other is
an appearance of the second resonance at a characteristic mass of second string
excited states. We investigate a possibility to observe these evidences of
low-scale string models by Monte Carlo simulations with a reference value of
M_s = 4 TeV at sqrt{s} = 14 TeV. It is shown that spin degeneracy at the dijet
resonance can be observed by looking the chi-distribution with integrated
luminosity of 20 fb^-1. It is shown that the second resonance can be observed
at rather close to the first resonance in the dijet invariant mass distribution
with integrated luminosity of 50 fb^-1. These are inevitable signatures of
low-scale string models.
| [
{
"created": "Tue, 18 Oct 2011 13:55:02 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Oct 2011 12:15:21 GMT",
"version": "v2"
},
{
"created": "Thu, 5 Jan 2012 06:58:12 GMT",
"version": "v3"
},
{
"created": "Thu, 15 Mar 2012 05:14:54 GMT",
"version": "v4"
}
] | 2012-03-16 | [
[
"Hashi",
"Manami",
""
],
[
"Kitazawa",
"Noriaki",
""
]
] | Low-scale string models, in which the string scale M_s is of the order of TeV with large extra dimensions, can solve the problems of scale hierarchy and non-renormalizable quantum gravity in the standard model. String excited states of the standard model particles are possibly observed as resonances in the dijet invariant mass distribution at the LHC. There are two properties to distinguish whether the resonances are due to low-scale string or some other "new physics". One is a characteristic angular distribution in dijet events at the resonance due to spin degeneracy of string excited states, and the other is an appearance of the second resonance at a characteristic mass of second string excited states. We investigate a possibility to observe these evidences of low-scale string models by Monte Carlo simulations with a reference value of M_s = 4 TeV at sqrt{s} = 14 TeV. It is shown that spin degeneracy at the dijet resonance can be observed by looking the chi-distribution with integrated luminosity of 20 fb^-1. It is shown that the second resonance can be observed at rather close to the first resonance in the dijet invariant mass distribution with integrated luminosity of 50 fb^-1. These are inevitable signatures of low-scale string models. |
1109.2338 | Helen Matskevich | S. M. Gerasyuta, and E. E. Matskevich | Dibaryons with two heavy quarks | 10 pages, types corrected. arXiv admin note: substantial text overlap
with arXiv:1105.0817 | null | 10.1142/S0218301312500589 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The relativistic six-quark equations are constructed in the framework of the
dispersion relation technique. The relativistic six-quark amplitudes of
dibaryons including the light $u$, $d$ and heavy $c$, $b$ quarks are
calculated. The approximate solutions of these equations using the method based
on the extraction of leading singularities of the heavy hexaquark amplitudes
are obtained. The poles of these amplitudes determine the masses of charmed and
bottom dibaryons with the isospins I=0, 1, 2 and the spin-parities $J^P=0^+$,
$1^+$, $2^+$.
| [
{
"created": "Sun, 11 Sep 2011 18:56:31 GMT",
"version": "v1"
},
{
"created": "Sun, 9 Oct 2011 16:37:23 GMT",
"version": "v2"
}
] | 2015-05-30 | [
[
"Gerasyuta",
"S. M.",
""
],
[
"Matskevich",
"E. E.",
""
]
] | The relativistic six-quark equations are constructed in the framework of the dispersion relation technique. The relativistic six-quark amplitudes of dibaryons including the light $u$, $d$ and heavy $c$, $b$ quarks are calculated. The approximate solutions of these equations using the method based on the extraction of leading singularities of the heavy hexaquark amplitudes are obtained. The poles of these amplitudes determine the masses of charmed and bottom dibaryons with the isospins I=0, 1, 2 and the spin-parities $J^P=0^+$, $1^+$, $2^+$. |
hep-ph/0609306 | Peter Richardson | S. Gieseke, D. Grellscheid, K. Hamilton, A. Ribon, P. Richardson, M.H.
Seymour, P. Stephens and B.R. Webber | Herwig++ 2.0 Release Note | Source code and additional information available at
http://hepforge.cedar.ac.uk/herwig/ | null | null | Cavendish-HEP-06/18, CERN-PH-TH/2006-182, IFJPAN-IV-2006-6,
IPPP/06/55, KA-TP-10-2006 | hep-ph | null | A new release of the Monte Carlo program Herwig++ (version 2.0) is now
available. This is the first version of the program which can be used for
hadron-hadron physics and includes the full simulation of both initial- and
final-state QCD radiation.
| [
{
"created": "Fri, 29 Sep 2006 13:08:55 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Gieseke",
"S.",
""
],
[
"Grellscheid",
"D.",
""
],
[
"Hamilton",
"K.",
""
],
[
"Ribon",
"A.",
""
],
[
"Richardson",
"P.",
""
],
[
"Seymour",
"M. H.",
""
],
[
"Stephens",
"P.",
""
],
[
"Webber",
... | A new release of the Monte Carlo program Herwig++ (version 2.0) is now available. This is the first version of the program which can be used for hadron-hadron physics and includes the full simulation of both initial- and final-state QCD radiation. |
1904.04840 | Debasish Borah | Debasish Borah, Dibyendu Nanda, Abhijit Kumar Saha | Common origin of modified chaotic inflation, non thermal dark matter and
Dirac neutrino mass | 25 pages, 5 figures, matches version accepted for publication in
Phys. Rev. D | Phys. Rev. D 101, 075006 (2020) | 10.1103/PhysRevD.101.075006 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a minimal extension of the standard model of particle physics to
accommodate cosmic inflation, dark matter and light neutrino masses. While the
inflationary phase is obtained from a modified chaotic inflation scenario,
consistent with latest cosmology data, the dark matter particle is a fermion
singlet which remains out of equilibrium in the early universe. The scalar
field which revives the chaotic inflation scenario by suitable modification
also assists in generating tiny couplings of dark matter with its mother
particle, naturally realizing the non-thermal or freeze-in type dark matter
scenario. Interestingly, the same assisting scalar field also helps in
realizing tiny Yukawa couplings required to generate sub-eV Dirac neutrino mass
from neutrino couplings to the standard model like Higgs field. The minimality
as well as providing a unified solution to all three problems keep the model
predictive at experiments spanning out to all frontiers.
| [
{
"created": "Tue, 9 Apr 2019 18:00:06 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Mar 2020 06:45:22 GMT",
"version": "v2"
}
] | 2020-04-15 | [
[
"Borah",
"Debasish",
""
],
[
"Nanda",
"Dibyendu",
""
],
[
"Saha",
"Abhijit Kumar",
""
]
] | We propose a minimal extension of the standard model of particle physics to accommodate cosmic inflation, dark matter and light neutrino masses. While the inflationary phase is obtained from a modified chaotic inflation scenario, consistent with latest cosmology data, the dark matter particle is a fermion singlet which remains out of equilibrium in the early universe. The scalar field which revives the chaotic inflation scenario by suitable modification also assists in generating tiny couplings of dark matter with its mother particle, naturally realizing the non-thermal or freeze-in type dark matter scenario. Interestingly, the same assisting scalar field also helps in realizing tiny Yukawa couplings required to generate sub-eV Dirac neutrino mass from neutrino couplings to the standard model like Higgs field. The minimality as well as providing a unified solution to all three problems keep the model predictive at experiments spanning out to all frontiers. |
hep-ph/9707360 | Giulia Pancheri | A. Corsetti, R.M. Godbole and G. Pancheri | Photon-Photon total inelastic cross-section | 7 pages, LateX, 2 eps figures. Talk presented at Photon'97, Egmond
aan Zee, May 1997 | null | null | LNF-97/027(P) | hep-ph | null | We discuss predictions for the total inelastic gamma-gamma cross-section and
their model dependence on the input parameters. We compare results from a
simple extension of the Regge Pomeron exchange model as well as predictions
from the eikonalized mini-jet model with recent LEP data.
| [
{
"created": "Wed, 16 Jul 1997 15:42:26 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Corsetti",
"A.",
""
],
[
"Godbole",
"R. M.",
""
],
[
"Pancheri",
"G.",
""
]
] | We discuss predictions for the total inelastic gamma-gamma cross-section and their model dependence on the input parameters. We compare results from a simple extension of the Regge Pomeron exchange model as well as predictions from the eikonalized mini-jet model with recent LEP data. |
hep-ph/9304308 | null | T. Garavaglia, W. K. Kwong and Dan-di Wu | Higgs particle detection using jets | 10 pages, Fig.1 a,b,c,d(surve on request), plain tex, PVAM-HEP-93-1 | Phys.Rev.D48:1899-1903,1993 | 10.1103/PhysRevD.48.R1899 | null | hep-ph | null | We study the possibility of detecting the Higgs boson in the intermediate
mass range via its two jet channel. We consider only Higgs bosons produced in
association with a $t \bar{t}$ pair. Both $t$ and $\bar{t}$ are required to
decay semileptonically to reduce the QCD background. The signal is compared
with the main background, $t \bar{t} + 2$ jets, after appropriate cuts. A
sizable signal above background is seen in our simulation at the parton level.
Use of the $t\bar{t}Z$ channel with $ Z$ decaying to $l^+ l^-$ is suggested for
eliminating theoretical uncertainties in determining the $t \bar{t}H$ signal.
| [
{
"created": "Tue, 27 Apr 1993 22:15:20 GMT",
"version": "v1"
}
] | 2009-12-30 | [
[
"Garavaglia",
"T.",
""
],
[
"Kwong",
"W. K.",
""
],
[
"Wu",
"Dan-di",
""
]
] | We study the possibility of detecting the Higgs boson in the intermediate mass range via its two jet channel. We consider only Higgs bosons produced in association with a $t \bar{t}$ pair. Both $t$ and $\bar{t}$ are required to decay semileptonically to reduce the QCD background. The signal is compared with the main background, $t \bar{t} + 2$ jets, after appropriate cuts. A sizable signal above background is seen in our simulation at the parton level. Use of the $t\bar{t}Z$ channel with $ Z$ decaying to $l^+ l^-$ is suggested for eliminating theoretical uncertainties in determining the $t \bar{t}H$ signal. |
hep-ph/0404096 | Csaba Csaki | Csaba Csaki | TASI Lectures on Extra Dimensions and Branes | 85 pages, 21 figures | null | null | null | hep-ph | null | This is a pedagogical introduction into theories with branes and extra
dimensions. We first discuss the construction of such models from an effective
field theory point of view, and then discuss large extra dimensions and some of
their phenomenological consequences. Various possible phenomena (split
fermions, mediation of supersymmetry breaking and orbifold breaking of
symmetries) are discussed next. The second half of this review is entirely
devoted to warped extra dimensions, including the construction of the
Randall-Sundrum solution, intersecting branes, radius stabilization, KK
phenomenology and bulk gauge bosons.
| [
{
"created": "Fri, 9 Apr 2004 20:31:49 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Csaki",
"Csaba",
""
]
] | This is a pedagogical introduction into theories with branes and extra dimensions. We first discuss the construction of such models from an effective field theory point of view, and then discuss large extra dimensions and some of their phenomenological consequences. Various possible phenomena (split fermions, mediation of supersymmetry breaking and orbifold breaking of symmetries) are discussed next. The second half of this review is entirely devoted to warped extra dimensions, including the construction of the Randall-Sundrum solution, intersecting branes, radius stabilization, KK phenomenology and bulk gauge bosons. |
1104.2014 | Ryosuke Sato | Ryosuke Sato, Satoshi Shirai and Kazuya Yonekura | A Possible Interpretation of CDF Dijet Mass Anomaly and its Realization
in Supersymmetry | 10 pages, 3 figures; v2 explanation and reference added; v3 : version
accepted for publication in PLB | null | 10.1016/j.physletb.2011.04.064 | UT-11-09, IPMU-11-0059, KEK-TH-1452 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, the CDF collaboration reports an anomaly in dijet mass distribution
in association with a lepton and missing energy. We discuss a possibility that
the origin of the lepton and missing energy comes not from a W boson but a new
boson particle, which is also responsible for the dijet mass peak. We show that
such a situation can be realized in the framework of the minimal supersymmetric
standard model and the dijet anomaly can be explained.
| [
{
"created": "Mon, 11 Apr 2011 17:59:33 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Apr 2011 11:14:06 GMT",
"version": "v2"
},
{
"created": "Wed, 11 May 2011 17:15:16 GMT",
"version": "v3"
}
] | 2015-05-27 | [
[
"Sato",
"Ryosuke",
""
],
[
"Shirai",
"Satoshi",
""
],
[
"Yonekura",
"Kazuya",
""
]
] | Recently, the CDF collaboration reports an anomaly in dijet mass distribution in association with a lepton and missing energy. We discuss a possibility that the origin of the lepton and missing energy comes not from a W boson but a new boson particle, which is also responsible for the dijet mass peak. We show that such a situation can be realized in the framework of the minimal supersymmetric standard model and the dijet anomaly can be explained. |
1809.07774 | Jae-hyeon Park | Jae-hyeon Park | Higgs mass and vacuum stability with high-scale supersymmetry | 11 pages | null | null | KIAS-Q18019 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the high-scale (split) MSSM, the measured Higgs mass sets an upper bound
on the supersymmetric scalar mass scale MSUSY around $10^{11}$ ($10^{8}$) GeV,
for $\tan\beta$ in the standard range and the central value of the top quark
mass $m_t$. This article discusses how maximal MSUSY is affected by negative
threshold corrections to the quartic Higgs coupling arising from the sbottom
and stop trilinear couplings. In the high-scale MSSM with very high
$\tan\beta$, the electroweak vacuum decay due to the large bottom Yukawa
coupling rules out the possibility of raising MSUSY beyond the above limit. In
cases with large $A_b$ or $A_t$, MSUSY as a common mass of the extra fermions
and scalars can be as high as $10^{17}$ GeV remaining consistent with $m_h$ and
the vacuum longevity if $m_t$ is smaller than the central value by $2\sigma$.
For the central value of $m_t$, the upper limit on MSUSY does not change very
much owing to the metastability, which is the case also in the split MSSM even
with $\pm 2\sigma$ variations in $m_t$.
| [
{
"created": "Thu, 20 Sep 2018 18:00:02 GMT",
"version": "v1"
}
] | 2018-09-24 | [
[
"Park",
"Jae-hyeon",
""
]
] | In the high-scale (split) MSSM, the measured Higgs mass sets an upper bound on the supersymmetric scalar mass scale MSUSY around $10^{11}$ ($10^{8}$) GeV, for $\tan\beta$ in the standard range and the central value of the top quark mass $m_t$. This article discusses how maximal MSUSY is affected by negative threshold corrections to the quartic Higgs coupling arising from the sbottom and stop trilinear couplings. In the high-scale MSSM with very high $\tan\beta$, the electroweak vacuum decay due to the large bottom Yukawa coupling rules out the possibility of raising MSUSY beyond the above limit. In cases with large $A_b$ or $A_t$, MSUSY as a common mass of the extra fermions and scalars can be as high as $10^{17}$ GeV remaining consistent with $m_h$ and the vacuum longevity if $m_t$ is smaller than the central value by $2\sigma$. For the central value of $m_t$, the upper limit on MSUSY does not change very much owing to the metastability, which is the case also in the split MSSM even with $\pm 2\sigma$ variations in $m_t$. |
hep-ph/0102342 | Andre Sopczak | V. Drollinger and A. Sopczak | Comparison of Higgs Boson Mass and Width Determination of the LHC and a
Linear Collider | 4 pages, 4 figures | Eur.Phys.J.direct C3 (2001) N1 | 10.1063/1.1394313 | Proc. LCWS Chicago, November 2000 | hep-ph | null | Two important properties of a Higgs boson are its mass and width. They may
distinguish the Standard Model (SM) Higgs boson from Higgs bosons of extended
models. We show results from a direct mass and width reconstruction for a Higgs
boson mass range from 120 to 340 GeV. The mass and width have been
reconstructed from the H --> ZZstar --> mu+mu-mu+mu- reaction in an LHC
simulation of the CMS detector. The determined mass accuracy has been compared
with that obtained from studies for a linear collider (LC). The mass precision
from the latter studies is derived by scaling previous LC simulation results
according to the expected event rates. For the Higgs boson width we compare a
direct determination with indirect methods and find good complementarity.
| [
{
"created": "Wed, 28 Feb 2001 13:45:35 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Drollinger",
"V.",
""
],
[
"Sopczak",
"A.",
""
]
] | Two important properties of a Higgs boson are its mass and width. They may distinguish the Standard Model (SM) Higgs boson from Higgs bosons of extended models. We show results from a direct mass and width reconstruction for a Higgs boson mass range from 120 to 340 GeV. The mass and width have been reconstructed from the H --> ZZstar --> mu+mu-mu+mu- reaction in an LHC simulation of the CMS detector. The determined mass accuracy has been compared with that obtained from studies for a linear collider (LC). The mass precision from the latter studies is derived by scaling previous LC simulation results according to the expected event rates. For the Higgs boson width we compare a direct determination with indirect methods and find good complementarity. |
1612.09371 | Bijaya Sahoo Dr. | B. K. Sahoo | Improved limits on the hadronic and semi-hadronic CP violating
parameters and role of a dark force carrier in the electric dipole moment of
$^{199}$Hg | 2 tables and 4 figures; Accepted for Phys. Rev. D | Phys. Rev. D 95, 013002 (2017) | 10.1103/PhysRevD.95.013002 | null | hep-ph nucl-th physics.atom-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Combining the recently reported electric dipole moment (EDM) of $^{199}$Hg
atom due to breaking of parity and time-reversal symmetries with the improved
relativistic atomic calculations, precise limits on the tensor-pseudotensor
(T-PT) electron-nucleus (e-N) coupling coefficient and the nuclear Schiff
moment (NSM) interactions are determined. Using these limits with the nuclear
calculations, we infer limits on the EDMs of neutron and proton as $d_n < 2.2
\times 10^{-26} |e| \rm{cm}$ and $d_p < 2.1 \times 10^{-25} |e| \rm{cm}$,
respectively, and on the quantum chromodynamics (QCD) parameter and the
combined up- and down- quark chromo-EDMs as $|\bar{\theta}| < 1.1 \times
10^{-10}$ and $|\tilde{d}_u - \tilde{d}_d| < 5.5 \times 10^{-27} |e|\rm{cm}$,
respectively. These are the best limits till date to probe new sources of CP
violation beyond the standard model (SM) from a diamagnetic atom. Role of
considering a capable many-body method to account the electron correlation
effects to all orders for inferring the above limits has been highlighted. From
this analysis, constraints on the T-PT e-N coupling coefficient with a large
range of mass of a possible dark matter carrier $\chi$ between the atomic
electrons and nucleus are given.
| [
{
"created": "Fri, 30 Dec 2016 02:12:43 GMT",
"version": "v1"
}
] | 2017-01-25 | [
[
"Sahoo",
"B. K.",
""
]
] | Combining the recently reported electric dipole moment (EDM) of $^{199}$Hg atom due to breaking of parity and time-reversal symmetries with the improved relativistic atomic calculations, precise limits on the tensor-pseudotensor (T-PT) electron-nucleus (e-N) coupling coefficient and the nuclear Schiff moment (NSM) interactions are determined. Using these limits with the nuclear calculations, we infer limits on the EDMs of neutron and proton as $d_n < 2.2 \times 10^{-26} |e| \rm{cm}$ and $d_p < 2.1 \times 10^{-25} |e| \rm{cm}$, respectively, and on the quantum chromodynamics (QCD) parameter and the combined up- and down- quark chromo-EDMs as $|\bar{\theta}| < 1.1 \times 10^{-10}$ and $|\tilde{d}_u - \tilde{d}_d| < 5.5 \times 10^{-27} |e|\rm{cm}$, respectively. These are the best limits till date to probe new sources of CP violation beyond the standard model (SM) from a diamagnetic atom. Role of considering a capable many-body method to account the electron correlation effects to all orders for inferring the above limits has been highlighted. From this analysis, constraints on the T-PT e-N coupling coefficient with a large range of mass of a possible dark matter carrier $\chi$ between the atomic electrons and nucleus are given. |
2106.14716 | Oleg Andreev | Oleg Andreev | String breaking in a cold wind as seen by string models | 13 pages, 8 figures; v2. minor corrections, references added,
Nucl.Phys.B version | null | 10.1016/j.nuclphysb.2022.115724 | LMU-ASC 04/21 | hep-ph hep-lat hep-th nucl-th | http://creativecommons.org/licenses/by/4.0/ | Using the gauge/string duality, we model a heavy quark-antiquark pair in a
color singlet state moving through a cold medium and explore the consequences
of temperature and velocity on string breaking. We show that the string
breaking distance slowly varies with temperature and velocity away from the
critical line but could fall near it.
| [
{
"created": "Mon, 28 Jun 2021 13:46:13 GMT",
"version": "v1"
},
{
"created": "Sun, 6 Mar 2022 19:44:35 GMT",
"version": "v2"
}
] | 2022-04-06 | [
[
"Andreev",
"Oleg",
""
]
] | Using the gauge/string duality, we model a heavy quark-antiquark pair in a color singlet state moving through a cold medium and explore the consequences of temperature and velocity on string breaking. We show that the string breaking distance slowly varies with temperature and velocity away from the critical line but could fall near it. |
1310.6472 | Motohiko Yoshimura | M. Yoshimura and N. Sasao (Center of Quantum Universe, Faculty of
Science, Okayama University, Research Core for Extreme Quantum World, Okayama
University) | Radiative emission of neutrino pair from nucleus and inner core
electrons in heavy atoms | 10 pages, 6 figures | Phys. Rev. D 89, 053013 (2014) | 10.1103/PhysRevD.89.053013 | null | hep-ph hep-ex quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Radiative emission of neutrino pair (RENP) from atomic states is a new tool
to experimentally investigate undetermined neutrino parameters such as the
smallest neutrino mass, the nature of neutrino masses (Majorana vs Dirac), and
their CP properties. We study effects of neutrino pair emission either from
nucleus or from inner core electrons in which the zero-th component of quark or
electron vector current gives rise to large coupling. Both the overall rate and
the spectral shape of photon energy are given for a few cases of interesting
target atoms. Calculated rates exceed those of previously considered target
atoms by many orders of magnitudes.
| [
{
"created": "Thu, 24 Oct 2013 03:37:30 GMT",
"version": "v1"
}
] | 2014-04-02 | [
[
"Yoshimura",
"M.",
"",
"Center of Quantum Universe, Faculty of\n Science, Okayama University, Research Core for Extreme Quantum World, Okayama\n University"
],
[
"Sasao",
"N.",
"",
"Center of Quantum Universe, Faculty of\n Science, Okayama University, Research Core for Extre... | Radiative emission of neutrino pair (RENP) from atomic states is a new tool to experimentally investigate undetermined neutrino parameters such as the smallest neutrino mass, the nature of neutrino masses (Majorana vs Dirac), and their CP properties. We study effects of neutrino pair emission either from nucleus or from inner core electrons in which the zero-th component of quark or electron vector current gives rise to large coupling. Both the overall rate and the spectral shape of photon energy are given for a few cases of interesting target atoms. Calculated rates exceed those of previously considered target atoms by many orders of magnitudes. |
hep-ph/0107308 | Mirco Cannoni | O. Panella, M. Cannoni, C. Carimalo, Y. N. Srivastava | Signal of heavy Majorana neutrinos at hadron colliders | 27 pages, 7 figures, Revtex3 | Phys.Rev. D65 (2002) 035005 | 10.1103/PhysRevD.65.035005 | null | hep-ph | null | The lepton number violating signal of like-sign-dileptons (LSD), p p \to
\ell^\pm\ell^\pm + 2 jets, is investigated within a model of mixing in the
neutrino sector assuming the existence of heavy Majorana neutrino states with a
left--handed coupling to the light leptons. The LSD signal receives
contributions both from the resonant production of a heavy Majorana neutrino
(N) and from the exchange of a virtual N in the WW fusion mechanisms. These two
possibilities are discussed in detail and compared. Helicity amplitudes are
given pointing out differences with calculations previously reported by other
authors. The signal cross--sections are computed at the energy of the LHC
collider (sqrt{S}=14 TeV) at CERN and within the existing experimental limits
on the mixing couplings, including those coming from neutrinoless double beta
decay. Detailed angular distributions of signal reactions which are
complementary to previous studies on the argument are presented.
| [
{
"created": "Mon, 30 Jul 2001 17:58:46 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Panella",
"O.",
""
],
[
"Cannoni",
"M.",
""
],
[
"Carimalo",
"C.",
""
],
[
"Srivastava",
"Y. N.",
""
]
] | The lepton number violating signal of like-sign-dileptons (LSD), p p \to \ell^\pm\ell^\pm + 2 jets, is investigated within a model of mixing in the neutrino sector assuming the existence of heavy Majorana neutrino states with a left--handed coupling to the light leptons. The LSD signal receives contributions both from the resonant production of a heavy Majorana neutrino (N) and from the exchange of a virtual N in the WW fusion mechanisms. These two possibilities are discussed in detail and compared. Helicity amplitudes are given pointing out differences with calculations previously reported by other authors. The signal cross--sections are computed at the energy of the LHC collider (sqrt{S}=14 TeV) at CERN and within the existing experimental limits on the mixing couplings, including those coming from neutrinoless double beta decay. Detailed angular distributions of signal reactions which are complementary to previous studies on the argument are presented. |
hep-ph/0411015 | Pradip Roy Kumar | Abhee K. Dutt-Mazumder, Jan-e Alam, Pradip Roy and Bikash Sinha | Stopping power of hot QCD plasma | revised version, section added, 9pages with 5 figures | Phys.Rev. D71 (2005) 094016 | 10.1103/PhysRevD.71.094016 | null | hep-ph nucl-th | null | The partonic energy loss has been calculated taking both the hard and soft
contributions for all the $2 \to 2$ processes, revealing the importance of the
individual channels. Cancellation of the intermediate separation scale has been
exhibited. Subtleties related to the identical final state partons have
properly been taken into account. The estimated collisional loss is compared
with its radiative counter part. We show that there exists a critical energy
($E_c$) below which the collisional loss is more than its radiative
counterpart. In addition, we present closed form formulas for both the
collision probabilities and the stopping power ($dE/dx$)
| [
{
"created": "Mon, 1 Nov 2004 12:01:44 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Apr 2005 09:35:35 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Dutt-Mazumder",
"Abhee K.",
""
],
[
"Alam",
"Jan-e",
""
],
[
"Roy",
"Pradip",
""
],
[
"Sinha",
"Bikash",
""
]
] | The partonic energy loss has been calculated taking both the hard and soft contributions for all the $2 \to 2$ processes, revealing the importance of the individual channels. Cancellation of the intermediate separation scale has been exhibited. Subtleties related to the identical final state partons have properly been taken into account. The estimated collisional loss is compared with its radiative counter part. We show that there exists a critical energy ($E_c$) below which the collisional loss is more than its radiative counterpart. In addition, we present closed form formulas for both the collision probabilities and the stopping power ($dE/dx$) |
1809.04924 | Marco Bonvini | Marco Bonvini | Recent progress in PDF theory | 6 pages. Contribution to LHCP 2018 | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the recent results obtained in the context of PDF determination
with the inclusion of logarithmic resummations and their phenomenological
applications.
| [
{
"created": "Thu, 13 Sep 2018 12:55:59 GMT",
"version": "v1"
}
] | 2018-09-14 | [
[
"Bonvini",
"Marco",
""
]
] | We discuss the recent results obtained in the context of PDF determination with the inclusion of logarithmic resummations and their phenomenological applications. |
hep-ph/9705437 | null | Shin Ishida, Muneyuki Ishida, Taku Ishida, Kunio Takamatsu, and
Tsuneaki Tsuru | Analysis of K\pi-scattering phase shift and existence of
\kappa(900)-particle | tex with PTP style, 2 eps figures | Prog.Theor.Phys.98:621-629,1997 | 10.1143/PTP.98.621 | null | hep-ph | null | Recently we have shown an evidence for existence of \sigma-particle in the
previous works; where the \pi\pi S-wave phase shift is reanalyzed, by
introducing a repulsive background suggested by the chiral symmetry, and by
applying a new method of Interfering Breit-Wigner Amplitudes. In this work we
also show, reanalyzing the K\pi S-wave phase shift from a similar standpoint,
an evidence for existence of \kappa(900), possibly to be a member of
\sigma-nonet.
| [
{
"created": "Tue, 27 May 1997 14:56:52 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Ishida",
"Shin",
""
],
[
"Ishida",
"Muneyuki",
""
],
[
"Ishida",
"Taku",
""
],
[
"Takamatsu",
"Kunio",
""
],
[
"Tsuru",
"Tsuneaki",
""
]
] | Recently we have shown an evidence for existence of \sigma-particle in the previous works; where the \pi\pi S-wave phase shift is reanalyzed, by introducing a repulsive background suggested by the chiral symmetry, and by applying a new method of Interfering Breit-Wigner Amplitudes. In this work we also show, reanalyzing the K\pi S-wave phase shift from a similar standpoint, an evidence for existence of \kappa(900), possibly to be a member of \sigma-nonet. |
1911.04502 | Daniele Teresi | Dario Buttazzo, Luca Di Luzio, Parsa Ghorbani, Christian Gross,
Giacomo Landini, Alessandro Strumia, Daniele Teresi, Jin-Wei Wang | Scalar gauge dynamics and Dark Matter | 51 pages, 5 figures, 3 tables; published version, expanded taking
into account the existence of extra stable states: C-odd SU(N) models
glueballs | JHEP 2001 (2020) 130 | 10.1007/JHEP01(2020)130 | DESY 19-197 | hep-ph astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider theories with one gauge group (SU, SO or Sp) and one scalar in a
two-index representation. The renormalizable action often has accidental
symmetries (such as global U(1) or unusual group parities) that lead to one or
more stable states, providing Dark Matter candidates. We discuss the confined
phase(s) of each theory and compute the two Higgs phases, finding no generic
dualities among them. Discrete gauge symmetries can arise and accidental
symmetries can be broken, possibly giving pseudo-Goldstone Dark Matter. Dark
Matter candidates can have a complicated sub-structure characteristic of each
group and can be accompanied by extra dark radiation.
| [
{
"created": "Mon, 11 Nov 2019 19:00:02 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Sep 2021 11:25:18 GMT",
"version": "v2"
}
] | 2021-09-08 | [
[
"Buttazzo",
"Dario",
""
],
[
"Di Luzio",
"Luca",
""
],
[
"Ghorbani",
"Parsa",
""
],
[
"Gross",
"Christian",
""
],
[
"Landini",
"Giacomo",
""
],
[
"Strumia",
"Alessandro",
""
],
[
"Teresi",
"Daniele",
""
]... | We consider theories with one gauge group (SU, SO or Sp) and one scalar in a two-index representation. The renormalizable action often has accidental symmetries (such as global U(1) or unusual group parities) that lead to one or more stable states, providing Dark Matter candidates. We discuss the confined phase(s) of each theory and compute the two Higgs phases, finding no generic dualities among them. Discrete gauge symmetries can arise and accidental symmetries can be broken, possibly giving pseudo-Goldstone Dark Matter. Dark Matter candidates can have a complicated sub-structure characteristic of each group and can be accompanied by extra dark radiation. |
hep-ph/0210257 | Gustavo Burdman | Gustavo Burdman and Yasunori Nomura | Unification of Higgs and Gauge Fields in Five Dimensions | 22 pages, version to appear in Nucl. Phys. B | Nucl.Phys.B656:3-22,2003 | 10.1016/S0550-3213(03)00088-9 | LBNL-51620, FERMILAB-Pub-02/261-T | hep-ph hep-th | null | We construct realistic theories in which the Higgs fields arise from extra
dimensional components of higher dimensional gauge fields. In particular, we
present a minimal 5D SU(3)_C x SU(3)_W model and a unified 5D SU(6) model. In
both cases the theory is reduced to the minimal supersymmetric standard model
below the compactification scale, with the two Higgs doublets arising from the
5D gauge multiplet. Quarks and Leptons are introduced in the bulk, giving
Yukawa couplings without conflicting with higher dimensional gauge invariance.
Despite the fact that they arise from higher dimensional gauge interactions,
the sizes of these Yukawa couplings can be different from the 4D gauge
couplings due to wave-function profiles of the matter zero modes determined by
bulk mass parameters. All unwanted fields are made heavy by introducing
appropriate matter and superpotentials on branes, which are also the source of
intergenerational mixings in the low-energy Yukawa matrices. The theory can
accommodate a realistic structure for the Yukawa couplings as well as small
neutrino masses. Scenarios for supersymmetry breaking and the mu-term
generation are also discussed.
| [
{
"created": "Thu, 17 Oct 2002 19:35:12 GMT",
"version": "v1"
},
{
"created": "Thu, 27 Feb 2003 23:45:18 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Burdman",
"Gustavo",
""
],
[
"Nomura",
"Yasunori",
""
]
] | We construct realistic theories in which the Higgs fields arise from extra dimensional components of higher dimensional gauge fields. In particular, we present a minimal 5D SU(3)_C x SU(3)_W model and a unified 5D SU(6) model. In both cases the theory is reduced to the minimal supersymmetric standard model below the compactification scale, with the two Higgs doublets arising from the 5D gauge multiplet. Quarks and Leptons are introduced in the bulk, giving Yukawa couplings without conflicting with higher dimensional gauge invariance. Despite the fact that they arise from higher dimensional gauge interactions, the sizes of these Yukawa couplings can be different from the 4D gauge couplings due to wave-function profiles of the matter zero modes determined by bulk mass parameters. All unwanted fields are made heavy by introducing appropriate matter and superpotentials on branes, which are also the source of intergenerational mixings in the low-energy Yukawa matrices. The theory can accommodate a realistic structure for the Yukawa couplings as well as small neutrino masses. Scenarios for supersymmetry breaking and the mu-term generation are also discussed. |
2209.13153 | Khiem Hong Phan | Anh Thu Nguyen (HCMUS), Dzung Tri Tran (HCMUS) and Khiem Hong Phan
(DuyTan Univ.) | One-loop on-shell and off-shell decay $H^*\rightarrow VV$ at future
$e^-e^-$ collider | 9 pages, 47th Vietnam Conference on Theoretical Physics (VCTP-47) | null | null | DTU2022-02 | hep-ph | http://creativecommons.org/licenses/by/4.0/ | One-loop on-shell and off-shell decays $H\rightarrow VV$ with
$VV=\gamma\gamma, Z\gamma, ZZ$ are presented in this paper. The effects of
one-loop on-shell and off-shell Higgs decays in Higgs productions at $e^-e^-$
collisions are also then examined. We find that the impacts of one-loop Higgs
decays are significant and they are must be taken into account at $e^-e^-$
collision.
| [
{
"created": "Tue, 27 Sep 2022 04:47:22 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Sep 2022 01:42:20 GMT",
"version": "v2"
}
] | 2022-09-29 | [
[
"Nguyen",
"Anh Thu",
"",
"HCMUS"
],
[
"Tran",
"Dzung Tri",
"",
"HCMUS"
],
[
"Phan",
"Khiem Hong",
"",
"DuyTan Univ."
]
] | One-loop on-shell and off-shell decays $H\rightarrow VV$ with $VV=\gamma\gamma, Z\gamma, ZZ$ are presented in this paper. The effects of one-loop on-shell and off-shell Higgs decays in Higgs productions at $e^-e^-$ collisions are also then examined. We find that the impacts of one-loop Higgs decays are significant and they are must be taken into account at $e^-e^-$ collision. |
2408.04234 | Anthony Calatayud-Cadenillas | A. Calatayud-Cadenillas, A. P\'erez-G and A. M. Gago | Distinguishing Beyond-Standard Model Effects in Neutrino Oscillation | null | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We systematically assess the DUNE experiment's ability to distinguish between
various beyond-standard neutrino oscillation hypotheses pair combinations. For
a pair comparison, we evaluate the statistical separation, where one hypothesis
plays the role of the true signal while the other corresponds to the test
signal. The beyond-standard neutrino oscillation hypotheses under scrutiny
include neutrino decay (invisible and visible), non-standard interactions,
quantum decoherence, and the violation of the equivalence principle. When taken
as the true model, we found that either quantum decoherence or the violation of
the equivalence principle are the easiest to differentiate compared to the rest
of the hypotheses. Additionally, from our statistical test, we investigate
potential discrepancies between the measured CP-violation phase $\delta_{CP}$
relative to its true value, which could occur for a given comparison. In our
analysis, we will take the true values of $\delta_{CP}$ as $-90^\circ$ and
$180^\circ$. Notably, even in cases where the beyond-standard neutrino
oscillation hypotheses scenarios are statistically indistinguishable, the
measured value can exhibit significant deviations from its true value.
| [
{
"created": "Thu, 8 Aug 2024 05:40:21 GMT",
"version": "v1"
}
] | 2024-08-09 | [
[
"Calatayud-Cadenillas",
"A.",
""
],
[
"Pérez-G",
"A.",
""
],
[
"Gago",
"A. M.",
""
]
] | We systematically assess the DUNE experiment's ability to distinguish between various beyond-standard neutrino oscillation hypotheses pair combinations. For a pair comparison, we evaluate the statistical separation, where one hypothesis plays the role of the true signal while the other corresponds to the test signal. The beyond-standard neutrino oscillation hypotheses under scrutiny include neutrino decay (invisible and visible), non-standard interactions, quantum decoherence, and the violation of the equivalence principle. When taken as the true model, we found that either quantum decoherence or the violation of the equivalence principle are the easiest to differentiate compared to the rest of the hypotheses. Additionally, from our statistical test, we investigate potential discrepancies between the measured CP-violation phase $\delta_{CP}$ relative to its true value, which could occur for a given comparison. In our analysis, we will take the true values of $\delta_{CP}$ as $-90^\circ$ and $180^\circ$. Notably, even in cases where the beyond-standard neutrino oscillation hypotheses scenarios are statistically indistinguishable, the measured value can exhibit significant deviations from its true value. |
hep-ph/9701393 | Peter Arnold | Peter Arnold | Hot B violation, the lattice, and hard thermal loops | 43 pages, Latex, uses revtex, epsf macro packages | Phys.Rev.D55:7781-7796,1997 | 10.1103/PhysRevD.55.7781 | UW/PT-97-2 | hep-ph hep-lat | null | It has recently been argued that the rate per unit volume of baryon number
violation (topological transitions) in the hot, symmetric phase of electroweak
theory is of the form $\eta \alpha_w^5 T^4$ in the weak-coupling limit, where
$\eta$ is a non-perturbative numerical coefficient. Over the past several
years, there have been attempts to extract the rate of baryon number violation
from real-time simulations of classical thermal field theory on a spatial
lattice. Unfortunately, the coefficient $\eta$ will not be the same for
classical lattice theories and the real quantum theory. However, by analyzing
the appropriate effective theory on the lattice using the method of hard
thermal loops, I show that the only obstruction to precisely relating the rates
in the real and lattice theories is the fact that the long-distance physics on
the lattice is not rotationally invariant. (This is unlike Euclidean-time
measurements, where rotational invariance is always recovered in the continuum
limit.) I then propose how this violation of rotational invariance can be
eliminated - and the real B violation rate measured - by choosing an
appropriate lattice Hamiltonian. I also propose a rough measure of the
systematic error to be expected from using simpler, unimproved Hamiltonians. As
a byproduct of my investigation, the plasma frequency and Debye mass are
computed for classical thermal field theory on the lattice.
| [
{
"created": "Tue, 28 Jan 1997 02:15:10 GMT",
"version": "v1"
}
] | 2016-09-06 | [
[
"Arnold",
"Peter",
""
]
] | It has recently been argued that the rate per unit volume of baryon number violation (topological transitions) in the hot, symmetric phase of electroweak theory is of the form $\eta \alpha_w^5 T^4$ in the weak-coupling limit, where $\eta$ is a non-perturbative numerical coefficient. Over the past several years, there have been attempts to extract the rate of baryon number violation from real-time simulations of classical thermal field theory on a spatial lattice. Unfortunately, the coefficient $\eta$ will not be the same for classical lattice theories and the real quantum theory. However, by analyzing the appropriate effective theory on the lattice using the method of hard thermal loops, I show that the only obstruction to precisely relating the rates in the real and lattice theories is the fact that the long-distance physics on the lattice is not rotationally invariant. (This is unlike Euclidean-time measurements, where rotational invariance is always recovered in the continuum limit.) I then propose how this violation of rotational invariance can be eliminated - and the real B violation rate measured - by choosing an appropriate lattice Hamiltonian. I also propose a rough measure of the systematic error to be expected from using simpler, unimproved Hamiltonians. As a byproduct of my investigation, the plasma frequency and Debye mass are computed for classical thermal field theory on the lattice. |
0904.3375 | Zhi-Qing Zhang | Zhi-Qing Zhang and Zhen-Jun Xiao | Study of scalar meson $a_0(980)$ from $B \to a_0(980)\pi$ Decays | 12 pages, 3 figures | Chin.Phys.C34:528-534,2010 | 10.1088/1674-1137/34/5/002 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we calculate the branching ratios and the direct CP-violating
asymmetries for decays $\bar{B}^0\to a^0_0(980)\pi^0, a^+_0(980)\pi^-,
a^-_0(980)\pi^+$ and $B^-\to a^0_0(980)\pi^-, a^-_0(980)\pi^0$ by employing the
perturbative QCD factorization approach. Although the light scalar meson
$a_0(980)$ is widely perceived as primarily the four-quark bound states, the
calculation shows that the 2-quark model supposition for $a_0(980)$ can not be
ruled out by the currently available experiment upper limits. In these
considered decays, the branching ratio for the $B^-\to a^0_0(980)\pi^-$ is the
largest, $2.8\times 10^{-6}$, while its direct CP asymmetry is the smallest,
$\sim 14%$. Although the direct CP asymmetries for the decays $\bar{B}^0\to
a^0_0(980)\pi^0, B^-\to a^-_0(980)\pi^0$ are large, about $(70\thicksim80)%$,
it is still difficult to measure them, since their branching ratios are small,
around $(4\thicksim5)\times 10^{-7}$.
| [
{
"created": "Wed, 22 Apr 2009 02:44:09 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Jun 2009 02:17:46 GMT",
"version": "v2"
}
] | 2011-04-07 | [
[
"Zhang",
"Zhi-Qing",
""
],
[
"Xiao",
"Zhen-Jun",
""
]
] | In this paper, we calculate the branching ratios and the direct CP-violating asymmetries for decays $\bar{B}^0\to a^0_0(980)\pi^0, a^+_0(980)\pi^-, a^-_0(980)\pi^+$ and $B^-\to a^0_0(980)\pi^-, a^-_0(980)\pi^0$ by employing the perturbative QCD factorization approach. Although the light scalar meson $a_0(980)$ is widely perceived as primarily the four-quark bound states, the calculation shows that the 2-quark model supposition for $a_0(980)$ can not be ruled out by the currently available experiment upper limits. In these considered decays, the branching ratio for the $B^-\to a^0_0(980)\pi^-$ is the largest, $2.8\times 10^{-6}$, while its direct CP asymmetry is the smallest, $\sim 14%$. Although the direct CP asymmetries for the decays $\bar{B}^0\to a^0_0(980)\pi^0, B^-\to a^-_0(980)\pi^0$ are large, about $(70\thicksim80)%$, it is still difficult to measure them, since their branching ratios are small, around $(4\thicksim5)\times 10^{-7}$. |
2311.13376 | Alesandro Santos | D. S. Cabral, A. F. Santos and R. Bufalo | Thermal Pair Production from Photon-Photon Collision: Breit-Wheeler
Process at Finite Temperature | 13 pages, accepted for publication in EPJC | null | null | null | hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | In this paper we examine the pair production through the Breit-Wheeler
process $\gamma~\gamma \to e^+ e^-$ in a thermal background. We compute the
thermal contribution to the Breit-Wheeler differential cross section within the
thermofield dynamics formalism. We evaluate in details the cross section for
this process, which possess a surprisingly simple expression valid for any
temperature $\beta$, from which we discuss some physically relevant aspects. We
also consider the high temperature regime of the cross section in order to have
a better understanding about its thermal behavior.
| [
{
"created": "Wed, 22 Nov 2023 13:18:52 GMT",
"version": "v1"
}
] | 2023-11-23 | [
[
"Cabral",
"D. S.",
""
],
[
"Santos",
"A. F.",
""
],
[
"Bufalo",
"R.",
""
]
] | In this paper we examine the pair production through the Breit-Wheeler process $\gamma~\gamma \to e^+ e^-$ in a thermal background. We compute the thermal contribution to the Breit-Wheeler differential cross section within the thermofield dynamics formalism. We evaluate in details the cross section for this process, which possess a surprisingly simple expression valid for any temperature $\beta$, from which we discuss some physically relevant aspects. We also consider the high temperature regime of the cross section in order to have a better understanding about its thermal behavior. |
1304.4443 | Mikko Laine | M. Laine, A. Rothkopf | Light-cone Wilson loop in classical lattice gauge theory | 20 pages. v2: more elaboration on systematic errors; published
version | JHEP 1307 (2013) 082 | null | null | hep-ph hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The transverse broadening of an energetic jet passing through a non-Abelian
plasma is believed to be described by the thermal expectation value of a
light-cone Wilson loop. In this exploratory study, we measure the light-cone
Wilson loop with classical lattice gauge theory simulations. We observe, as
suggested by previous studies, that there are strong interactions already at
short transverse distances, which may lead to more efficient jet quenching than
in leading-order perturbation theory. We also verify that the asymptotics of
the Wilson loop do not change qualitatively when crossing the light cone, which
supports arguments in the literature that infrared contributions to jet
quenching can be studied with dimensionally reduced simulations in the
space-like domain. Finally we speculate on possibilities for full
four-dimensional lattice studies of the same observable, perhaps by employing
shifted boundary conditions in order to simulate ensembles boosted by an
imaginary velocity.
| [
{
"created": "Tue, 16 Apr 2013 13:43:53 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Jul 2013 16:16:45 GMT",
"version": "v2"
}
] | 2013-07-12 | [
[
"Laine",
"M.",
""
],
[
"Rothkopf",
"A.",
""
]
] | The transverse broadening of an energetic jet passing through a non-Abelian plasma is believed to be described by the thermal expectation value of a light-cone Wilson loop. In this exploratory study, we measure the light-cone Wilson loop with classical lattice gauge theory simulations. We observe, as suggested by previous studies, that there are strong interactions already at short transverse distances, which may lead to more efficient jet quenching than in leading-order perturbation theory. We also verify that the asymptotics of the Wilson loop do not change qualitatively when crossing the light cone, which supports arguments in the literature that infrared contributions to jet quenching can be studied with dimensionally reduced simulations in the space-like domain. Finally we speculate on possibilities for full four-dimensional lattice studies of the same observable, perhaps by employing shifted boundary conditions in order to simulate ensembles boosted by an imaginary velocity. |
1812.02208 | Karim Benakli | Karim Benakli, Yifan Chen and Ga\"etan Lafforgue-Marmet | Predicting Alignment in a Two Higgs Doublet Model | 12 pages, 1 figure. Contribution to the proceedings of the 7th
International Conference on New Frontiers in Physics (ICNFP 2018), 4-12 July
2018, Crete, Greece. Typos corrected. Some explanations added. Corresponds to
the published version | Proceedings 2019, 13, 2 | 10.3390/proceedings2019013002 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that a non-abelian global $SU(2)_R$ acting on the quartic part of the
two Higgs Doublet Model leads, at tree-level, to an automatic alignment without
decoupling. An example of phenomenologically viable model with this feature is
the the low energy effective field theory of the Minimal Dirac Gaugino
Supersymmetric Model in the limit where the adjoint scalars are decoupled. We
discuss here how the $SU(2)_R$ can be identified with the R-symmetry of the
$N=2$ supersymmetry in the gauge and Higgs sectors. We also review how the
radiative corrections lead to a very small misalignment.
| [
{
"created": "Wed, 5 Dec 2018 20:07:49 GMT",
"version": "v1"
},
{
"created": "Mon, 27 May 2019 13:19:21 GMT",
"version": "v2"
}
] | 2019-05-28 | [
[
"Benakli",
"Karim",
""
],
[
"Chen",
"Yifan",
""
],
[
"Lafforgue-Marmet",
"Gaëtan",
""
]
] | We show that a non-abelian global $SU(2)_R$ acting on the quartic part of the two Higgs Doublet Model leads, at tree-level, to an automatic alignment without decoupling. An example of phenomenologically viable model with this feature is the the low energy effective field theory of the Minimal Dirac Gaugino Supersymmetric Model in the limit where the adjoint scalars are decoupled. We discuss here how the $SU(2)_R$ can be identified with the R-symmetry of the $N=2$ supersymmetry in the gauge and Higgs sectors. We also review how the radiative corrections lead to a very small misalignment. |
2009.00830 | Jorge David Castano-Yepes | Alejandro Ayala, Jorge David Casta\~no-Yepes, L. A. Hern\'andez, Jordi
Salinas, R. Zamora | Gluon polarization tensor and dispersion relation in a weakly magnetized
medium | 14 pages, 6 figures. Ref.[35] was added | null | 10.1140/epja/s10050-021-00429-4 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the polarization and dispersion properties of gluons moving within a
weakly magnetized background at one-loop order. To this end, we show two
alternative derivations of the charged fermion propagator in the weak field
expansion and use this expression to compute the lowest order magnetic field
correction to the gluon polarization tensor. We explicitly show that, in spite
of its cumbersome appearance, the gluon polarization tensor is transverse as
required by gauge invariance. We also show that none of the three polarization
modes develops a magnetic mass and that gluons propagate along the light cone,
non withstanding that Lorentz invariance is lost due to the presence of the
magnetic field. By comparing with the expression for the gluon polarization
tensor valid to all orders in the magnetic field, the existence of a second
solution, corresponding to a finite gluon mass, is shown to be spurious and an
artifact of the lowest order approximation in the field strength. We also study
the strength of the polarization modes for real gluons. We conclude that,
provided the spurious solutions are discarded, the lowest order approximation
to the gluon polarization and dispersion properties is good as long as the
field strength is small compared to the loop fermion mass.
| [
{
"created": "Wed, 2 Sep 2020 05:38:13 GMT",
"version": "v1"
},
{
"created": "Sat, 5 Sep 2020 19:54:19 GMT",
"version": "v2"
}
] | 2021-05-05 | [
[
"Ayala",
"Alejandro",
""
],
[
"Castaño-Yepes",
"Jorge David",
""
],
[
"Hernández",
"L. A.",
""
],
[
"Salinas",
"Jordi",
""
],
[
"Zamora",
"R.",
""
]
] | We study the polarization and dispersion properties of gluons moving within a weakly magnetized background at one-loop order. To this end, we show two alternative derivations of the charged fermion propagator in the weak field expansion and use this expression to compute the lowest order magnetic field correction to the gluon polarization tensor. We explicitly show that, in spite of its cumbersome appearance, the gluon polarization tensor is transverse as required by gauge invariance. We also show that none of the three polarization modes develops a magnetic mass and that gluons propagate along the light cone, non withstanding that Lorentz invariance is lost due to the presence of the magnetic field. By comparing with the expression for the gluon polarization tensor valid to all orders in the magnetic field, the existence of a second solution, corresponding to a finite gluon mass, is shown to be spurious and an artifact of the lowest order approximation in the field strength. We also study the strength of the polarization modes for real gluons. We conclude that, provided the spurious solutions are discarded, the lowest order approximation to the gluon polarization and dispersion properties is good as long as the field strength is small compared to the loop fermion mass. |
hep-ph/0503268 | Mingzhe Li | Mingzhe Li, Bo Feng, and Xinmin Zhang | A Single Scalar Field Model of Dark Energy with Equation of State
Crossing -1 | 4 pages, 1 figure, the version accepted by JCAP, presentation
improved and references added | JCAP 0512 (2005) 002 | 10.1088/1475-7516/2005/12/002 | null | hep-ph astro-ph gr-qc hep-th | null | In this paper we study the possibility of building models of dark energy with
equation of state across -1 and propose explicitly a model with a single scalar
field which gives rise to an equation of state larger than -1 in the past and
less than -1 at the present time, consistent with the current observations.
| [
{
"created": "Sun, 27 Mar 2005 16:18:07 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Nov 2005 14:26:14 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Li",
"Mingzhe",
""
],
[
"Feng",
"Bo",
""
],
[
"Zhang",
"Xinmin",
""
]
] | In this paper we study the possibility of building models of dark energy with equation of state across -1 and propose explicitly a model with a single scalar field which gives rise to an equation of state larger than -1 in the past and less than -1 at the present time, consistent with the current observations. |
2402.16503 | Poonam Choudhary | Dipankar Chakrabarti, Poonam Choudhary, Bheemsehan Gurjar, Tanmay
Maji, Chandan Mondal and Asmita Mukherjee | Gluon generalized parton distributions of the proton at non-zero
skewness | 18 pages, 9 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using a recently developed light-front spectator model that incorporates
gluon, where the light-front wave functions are modeled from the soft-wall
AdS/QCD prediction, we examine the leading twist gluon generalized parton
distributions (GPDs) inside the proton. We derive the chirally even and odd
distributions by using the overlap representation of the light-front wave
functions. In terms of GPDs at non-zero skewness, we investigate the entire
three-dimensional representation of gluons. We analyse the gluon impact
parameter distributions at $\xi=0$ using the Fourier transform of GPDs. We
address the total angular momentum contribution of the gluons by using the Ji's
sum rule and also give our predictions for both the canonical and kinetic
orbital angular momentum in the light-cone gauge.
| [
{
"created": "Mon, 26 Feb 2024 11:37:16 GMT",
"version": "v1"
}
] | 2024-02-27 | [
[
"Chakrabarti",
"Dipankar",
""
],
[
"Choudhary",
"Poonam",
""
],
[
"Gurjar",
"Bheemsehan",
""
],
[
"Maji",
"Tanmay",
""
],
[
"Mondal",
"Chandan",
""
],
[
"Mukherjee",
"Asmita",
""
]
] | Using a recently developed light-front spectator model that incorporates gluon, where the light-front wave functions are modeled from the soft-wall AdS/QCD prediction, we examine the leading twist gluon generalized parton distributions (GPDs) inside the proton. We derive the chirally even and odd distributions by using the overlap representation of the light-front wave functions. In terms of GPDs at non-zero skewness, we investigate the entire three-dimensional representation of gluons. We analyse the gluon impact parameter distributions at $\xi=0$ using the Fourier transform of GPDs. We address the total angular momentum contribution of the gluons by using the Ji's sum rule and also give our predictions for both the canonical and kinetic orbital angular momentum in the light-cone gauge. |
hep-ph/9805310 | John Gracey | JA Gracey | Status of twist-2 operator dimensions at O(1/N_f) | 4 latex pages, contribution to DIS 98 | null | null | LTH 425 | hep-ph | null | We review the computation of the anomalous dimensions of the twist-2
unpolarized operators in the large N_f expansion. Results are discussed for the
predominantly gluonic singlet operator and the O(1/N_f) part of the 3-loop
splitting function is given.
| [
{
"created": "Wed, 13 May 1998 13:59:52 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Gracey",
"JA",
""
]
] | We review the computation of the anomalous dimensions of the twist-2 unpolarized operators in the large N_f expansion. Results are discussed for the predominantly gluonic singlet operator and the O(1/N_f) part of the 3-loop splitting function is given. |
0704.2684 | Thomas Kernreiter | Karl Hohenwarter-Sodek, Thomas Kernreiter | Effects of Lepton Flavour Violation on Chargino Production at the Linear
Collider | 11pp; final version for JHEP | JHEP 0706:071,2007 | 10.1088/1126-6708/2007/06/071 | null | hep-ph | null | We study the effects of lepton flavour violation (LFV) on the production
processes e+e- --> \chi+_i \chi-_j at a linear collider with longitudinal e+
and e- beam polarizations. In the case of LFV the sneutrino mass eigenstates
have no definite flavour, therefore, in the t-channel more than one sneutrino
mass eigenstate can contribute to the chargino production cross sections. Our
framework is the Minimal Supersymmetric Standard Model (MSSM) including LFV
terms. We show that in spite of the restrictions on the LFV parameters due to
the current limits on rare lepton decays, the cross section \sigma(e+e- -->
\chi+_1 \chi-_1) can change by a factor of 2 or more when varying the LFV
mixing angles. We point out that even if the present bound on BR(tau- --> e-
gamma) improves by a factor of thousand the influence of LFV on the chargino
production cross section can be significant. These results could have an
important impact on the strategies for determining the underlying model
parameters at the linear collider.
| [
{
"created": "Fri, 20 Apr 2007 10:43:50 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Jun 2007 09:27:49 GMT",
"version": "v2"
}
] | 2009-11-13 | [
[
"Hohenwarter-Sodek",
"Karl",
""
],
[
"Kernreiter",
"Thomas",
""
]
] | We study the effects of lepton flavour violation (LFV) on the production processes e+e- --> \chi+_i \chi-_j at a linear collider with longitudinal e+ and e- beam polarizations. In the case of LFV the sneutrino mass eigenstates have no definite flavour, therefore, in the t-channel more than one sneutrino mass eigenstate can contribute to the chargino production cross sections. Our framework is the Minimal Supersymmetric Standard Model (MSSM) including LFV terms. We show that in spite of the restrictions on the LFV parameters due to the current limits on rare lepton decays, the cross section \sigma(e+e- --> \chi+_1 \chi-_1) can change by a factor of 2 or more when varying the LFV mixing angles. We point out that even if the present bound on BR(tau- --> e- gamma) improves by a factor of thousand the influence of LFV on the chargino production cross section can be significant. These results could have an important impact on the strategies for determining the underlying model parameters at the linear collider. |
1403.4849 | Valentin Kasper | Valentin Kasper, Florian Hebenstreit, J\"urgen Berges | Fermion production from real-time lattice gauge theory in the
classical-statistical regime | 17 pages, 10 figures, Revised version: minor corrections, PRD Version | Phys. Rev. D 90, 025016 (2014) | 10.1103/PhysRevD.90.025016 | null | hep-ph hep-lat quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the real-time dynamics of U(1) and SU(N) gauge theories
coupled to fermions on a lattice. While real-time lattice gauge theory is not
amenable to standard importance sampling techniques, for a large class of
time-dependent problems the quantum dynamics can be accurately mapped onto a
classical-statistical ensemble. We illustrate the genuine quantum contributions
included in this description by giving a diagrammatic representation in a
series expansion. The non-perturbative simulation method is then applied to
electron-positron production in quantum electrodynamics in three spatial
dimensions. We compare to analytic results for constant background field and
demonstrate the importance of back-reaction of the produced fermion pairs on
the gauge fields.
| [
{
"created": "Wed, 19 Mar 2014 15:43:26 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Jul 2014 14:05:21 GMT",
"version": "v2"
},
{
"created": "Sat, 9 Aug 2014 14:40:58 GMT",
"version": "v3"
}
] | 2014-08-12 | [
[
"Kasper",
"Valentin",
""
],
[
"Hebenstreit",
"Florian",
""
],
[
"Berges",
"Jürgen",
""
]
] | We investigate the real-time dynamics of U(1) and SU(N) gauge theories coupled to fermions on a lattice. While real-time lattice gauge theory is not amenable to standard importance sampling techniques, for a large class of time-dependent problems the quantum dynamics can be accurately mapped onto a classical-statistical ensemble. We illustrate the genuine quantum contributions included in this description by giving a diagrammatic representation in a series expansion. The non-perturbative simulation method is then applied to electron-positron production in quantum electrodynamics in three spatial dimensions. We compare to analytic results for constant background field and demonstrate the importance of back-reaction of the produced fermion pairs on the gauge fields. |
hep-ph/9712514 | Leonid Burakovsky | M.M. Brisudova, L. Burakovsky and T. Goldman | New Glueball-Meson Mass Relations | Extensive revision including response to comments received, value of
glueball Regge slope, and a consideration of radial excitations. 14 pages,
LaTeX | Phys.Rev.D58:114015,1998 | 10.1103/PhysRevD.58.114015 | LA-UR-97-3794 | hep-ph | null | Using the ``glueball dominance'' picture of the mixing between q\bar{q}
mesons of different hidden flavors, we establish new glueball-meson mass
relations which serve as a basis for glueball spectral systematics. For the
tensor glueball mass 2.3\pm 0.1 GeV used as an input parameter, these relations
predict the following glueball masses: M(0^{++})\simeq 1.65\pm 0.05 GeV,
M(1^{--})\simeq 3.2\pm 0.2 GeV, M(2^{-+})\simeq 2.95\pm 0.15 GeV,
M(3^{--})\simeq 2.8\pm 0.15 GeV. We briefly discuss the failure of such
relations for the pseudoscalar sector. Our results are consistent with
(quasi)-linear Regge trajectories for glueballs with slope \simeq 0.3\pm 0.1
GeV^{-2}.
| [
{
"created": "Tue, 23 Dec 1997 22:26:48 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Feb 1998 23:34:25 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Brisudova",
"M. M.",
""
],
[
"Burakovsky",
"L.",
""
],
[
"Goldman",
"T.",
""
]
] | Using the ``glueball dominance'' picture of the mixing between q\bar{q} mesons of different hidden flavors, we establish new glueball-meson mass relations which serve as a basis for glueball spectral systematics. For the tensor glueball mass 2.3\pm 0.1 GeV used as an input parameter, these relations predict the following glueball masses: M(0^{++})\simeq 1.65\pm 0.05 GeV, M(1^{--})\simeq 3.2\pm 0.2 GeV, M(2^{-+})\simeq 2.95\pm 0.15 GeV, M(3^{--})\simeq 2.8\pm 0.15 GeV. We briefly discuss the failure of such relations for the pseudoscalar sector. Our results are consistent with (quasi)-linear Regge trajectories for glueballs with slope \simeq 0.3\pm 0.1 GeV^{-2}. |
0909.0037 | Nikolaos Kidonakis | Nikolaos Kidonakis | Higher-order corrections to top-antitop pair and single top quark
production | 4 pages, 10 figures; to be published in the proceedings of DPF-2009,
Detroit, MI, July 2009, eConf C090726 | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I present the latest results on the theoretical cross section for top-antitop
pair production as well as for single top production at the Tevatron and the
LHC. The calculations include higher-order soft-gluon corrections which are
dominant near threshold. The top quark transverse momentum distribution is also
presented.
| [
{
"created": "Mon, 31 Aug 2009 20:55:32 GMT",
"version": "v1"
}
] | 2009-09-02 | [
[
"Kidonakis",
"Nikolaos",
""
]
] | I present the latest results on the theoretical cross section for top-antitop pair production as well as for single top production at the Tevatron and the LHC. The calculations include higher-order soft-gluon corrections which are dominant near threshold. The top quark transverse momentum distribution is also presented. |
1505.04994 | L.T. Handoko | T.P. Djun, B. Soegijono, T. Mart, L.T. Handoko | Viscosities of Gluon Dominated QGP Model within Relativistic Non-Abelian
Hydrodynamics | 12 pages, 2 figures | International Journal of Modern Physics A30 (2015) 1550077 | 10.1142/S0217751X15500773 | FISIKALIPI-15031 | hep-ph hep-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Based on the first principle calculation, a Lagrangian for the system
describing quarks, gluons, and their interactions, is constructed. Ascribed to
the existence of dissipative behavior as a consequence of strong interaction
within quark-gluon plasma (QGP) matter, auxiliary terms describing viscosities
are constituted into the Lagrangian. Through a "kind" of phase transition,
gluon field is redefined as a scalar field with four-vector velocity inherently
attached. Then, the Lagrangian is elaborated further to produce the
energy-momentum tensor of dissipative fluid-like system and the equation of
motion (EOM). By imposing the law of energy and momentum conservation, the
values of shear and bulk viscosities are analytically calculated. Our result
shows that, at the energy level close to hadronization, the bulk viscosity is
bigger than shear viscosity. By making use of the conjectured values $\eta / s
\sim 1 / 4\pi$ and $\zeta / s \sim 1$, the ratio of bulk to shear viscosity is
found to be $\zeta / \eta > 4 \pi$.
| [
{
"created": "Tue, 19 May 2015 13:51:54 GMT",
"version": "v1"
}
] | 2015-05-20 | [
[
"Djun",
"T. P.",
""
],
[
"Soegijono",
"B.",
""
],
[
"Mart",
"T.",
""
],
[
"Handoko",
"L. T.",
""
]
] | Based on the first principle calculation, a Lagrangian for the system describing quarks, gluons, and their interactions, is constructed. Ascribed to the existence of dissipative behavior as a consequence of strong interaction within quark-gluon plasma (QGP) matter, auxiliary terms describing viscosities are constituted into the Lagrangian. Through a "kind" of phase transition, gluon field is redefined as a scalar field with four-vector velocity inherently attached. Then, the Lagrangian is elaborated further to produce the energy-momentum tensor of dissipative fluid-like system and the equation of motion (EOM). By imposing the law of energy and momentum conservation, the values of shear and bulk viscosities are analytically calculated. Our result shows that, at the energy level close to hadronization, the bulk viscosity is bigger than shear viscosity. By making use of the conjectured values $\eta / s \sim 1 / 4\pi$ and $\zeta / s \sim 1$, the ratio of bulk to shear viscosity is found to be $\zeta / \eta > 4 \pi$. |
2111.01088 | Paul Caucal | Paul Caucal | Asymptotics of transverse momentum broadening in dense QCD media | 7 pages, proceeding of the 50th International Symposium on
Multiparticle Dynamics (ISMD2021) | null | null | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the asymptotic behaviour of the transverse momentum broadening
distribution of an energetic quark or gluon propagating through dense QCD
matter, in the large system size $L$ limit, taking into account radiative
corrections in the double logarithmic approximation. Thanks to a connection
between the evolution of the jet quenching parameter $\hat{q}$ and the
formation of traveling wave fronts in nonlinear physics, we obtain a formula
for the $L$ dependence of the characteristic transverse momentum scale $Q_s$ of
the distribution valid up to terms of order $1/\ln(L)$. We briefly discuss the
physical implications of this formula for jet quenching and small-$x$
phenomenology.
| [
{
"created": "Mon, 1 Nov 2021 16:59:50 GMT",
"version": "v1"
}
] | 2021-11-02 | [
[
"Caucal",
"Paul",
""
]
] | We study the asymptotic behaviour of the transverse momentum broadening distribution of an energetic quark or gluon propagating through dense QCD matter, in the large system size $L$ limit, taking into account radiative corrections in the double logarithmic approximation. Thanks to a connection between the evolution of the jet quenching parameter $\hat{q}$ and the formation of traveling wave fronts in nonlinear physics, we obtain a formula for the $L$ dependence of the characteristic transverse momentum scale $Q_s$ of the distribution valid up to terms of order $1/\ln(L)$. We briefly discuss the physical implications of this formula for jet quenching and small-$x$ phenomenology. |
hep-ph/0506297 | Stephen King | S.F.King | Predicting neutrino parameters from SO(3) family symmetry and
quark-lepton unification | 24 pages; references modified, footnote extended, version to appear
in JHEP | JHEP0508:105,2005 | 10.1088/1126-6708/2005/08/105 | null | hep-ph | null | We show how the neutrino mixing angles and oscillation phase can be predicted
from tri-bimaximal neutrino mixing, corrected by charged lepton mixing angles
which are related to quark mixing angles via quark-lepton unification. The
tri-bimaximal neutrino mixing can naturally originate from the see-saw
mechanism via constrained sequential dominance (CSD), where CSD can result from
the vacuum alignment of a non-Abelian family symmetry such as SO(3). We
construct a realistic model of quark and lepton masses and mixings based on
SO(3) family symmetry with quark-lepton unification based on the Pati-Salam
gauge group. The atmospheric angle is predicted to be approximately maximal
$\theta_{23}= 45^\circ$, corrected by the quark mixing angle
$\theta_{23}^{\mathrm{CKM}}\approx 2.4^\circ$, with the correction controlled
by an undetermined phase in the quark sector. The solar angle is predicted by
the tri-bimaximal complementarity relation: $\theta_{12}+
\frac{1}{\sqrt{2}}\frac{\theta_{\mathrm{C}}}{3} \cos (\delta - \pi) \approx
35.26^\circ $, where $\theta_{\mathrm{C}}$ is the Cabibbo angle and $\delta$ is
the neutrino oscillation phase. The reactor angle is predicted to be
$\theta_{13} \approx \frac{1}{\sqrt{2}}\frac{\theta_{\mathrm{C}}}{3}\approx
3.06^\circ$. The MNS neutrino oscillation phase $\delta$ is predicted in terms
of the solar angle to be $\cos (\delta - \pi) \approx (35.26^\circ -
\theta_{12}^\circ)/3.06^\circ $. These predictions can all be tested by future
high precision neutrino oscillation experiments, thereby probing the nature of
high energy quark-lepton unification.
| [
{
"created": "Tue, 28 Jun 2005 19:01:32 GMT",
"version": "v1"
},
{
"created": "Fri, 8 Jul 2005 10:46:40 GMT",
"version": "v2"
},
{
"created": "Tue, 16 Aug 2005 09:42:28 GMT",
"version": "v3"
}
] | 2009-11-11 | [
[
"King",
"S. F.",
""
]
] | We show how the neutrino mixing angles and oscillation phase can be predicted from tri-bimaximal neutrino mixing, corrected by charged lepton mixing angles which are related to quark mixing angles via quark-lepton unification. The tri-bimaximal neutrino mixing can naturally originate from the see-saw mechanism via constrained sequential dominance (CSD), where CSD can result from the vacuum alignment of a non-Abelian family symmetry such as SO(3). We construct a realistic model of quark and lepton masses and mixings based on SO(3) family symmetry with quark-lepton unification based on the Pati-Salam gauge group. The atmospheric angle is predicted to be approximately maximal $\theta_{23}= 45^\circ$, corrected by the quark mixing angle $\theta_{23}^{\mathrm{CKM}}\approx 2.4^\circ$, with the correction controlled by an undetermined phase in the quark sector. The solar angle is predicted by the tri-bimaximal complementarity relation: $\theta_{12}+ \frac{1}{\sqrt{2}}\frac{\theta_{\mathrm{C}}}{3} \cos (\delta - \pi) \approx 35.26^\circ $, where $\theta_{\mathrm{C}}$ is the Cabibbo angle and $\delta$ is the neutrino oscillation phase. The reactor angle is predicted to be $\theta_{13} \approx \frac{1}{\sqrt{2}}\frac{\theta_{\mathrm{C}}}{3}\approx 3.06^\circ$. The MNS neutrino oscillation phase $\delta$ is predicted in terms of the solar angle to be $\cos (\delta - \pi) \approx (35.26^\circ - \theta_{12}^\circ)/3.06^\circ $. These predictions can all be tested by future high precision neutrino oscillation experiments, thereby probing the nature of high energy quark-lepton unification. |
1104.4087 | Michihisa Takeuchi | Tilman Plehn and Michihisa Takeuchi | W+Jets at CDF: Evidence for Top Quarks | 6pages, 6 figures | J.Phys.G38:095006,2011 | 10.1088/0954-3899/38/9/095006 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, an anomaly of W+jets events at large invariant masses has been
reported by CDF. Many interpretations as physics beyond the Standard Model are
being offered. We show how such an invariant mass peak can arise from a slight
shift in the relative normalization of the top and WW backgrounds.
| [
{
"created": "Wed, 20 Apr 2011 18:15:53 GMT",
"version": "v1"
}
] | 2011-07-29 | [
[
"Plehn",
"Tilman",
""
],
[
"Takeuchi",
"Michihisa",
""
]
] | Recently, an anomaly of W+jets events at large invariant masses has been reported by CDF. Many interpretations as physics beyond the Standard Model are being offered. We show how such an invariant mass peak can arise from a slight shift in the relative normalization of the top and WW backgrounds. |
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