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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1901.01175 | Renaud Boussarie | Tolga Altinoluk, Renaud Boussarie and Piotr Kotko | Interplay of the CGC and TMD frameworks to all orders in kinematic twist | 42 pages, 7 figures, 1 table | null | 10.1007/JHEP05(2019)156 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A framework for an improved TMD (iTMD) factorization scheme at small $x$,
involving off-shell perturbative subamplitudes, was recently developed as an
interpolation between the TMD $k_t \ll Q$ regime and the BFKL $k_t \sim Q$
regime. In this article, we study the relation between CGC and iTMD amplitudes.
We first show how the dipole-size expansion of CGC amplitudes resembles the
twist expansion of a TMD amplitude. Then, by isolating kinematic twists, we
prove that iTMD amplitudes are obtained with infinite kinematic twist accuracy
by simply getting rid of all genuine twist contributions in a CGC amplitude.
Finally we compare the amplitudes obtained via a proper kinematic twist
expansion to those obtained via a more standard dilute expansion to show the
relation between the iTMD framework and the dilute low $x$ framework.
| [
{
"created": "Fri, 4 Jan 2019 15:31:25 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Jan 2019 20:04:24 GMT",
"version": "v2"
}
] | 2019-06-26 | [
[
"Altinoluk",
"Tolga",
""
],
[
"Boussarie",
"Renaud",
""
],
[
"Kotko",
"Piotr",
""
]
] | A framework for an improved TMD (iTMD) factorization scheme at small $x$, involving off-shell perturbative subamplitudes, was recently developed as an interpolation between the TMD $k_t \ll Q$ regime and the BFKL $k_t \sim Q$ regime. In this article, we study the relation between CGC and iTMD amplitudes. We first show how the dipole-size expansion of CGC amplitudes resembles the twist expansion of a TMD amplitude. Then, by isolating kinematic twists, we prove that iTMD amplitudes are obtained with infinite kinematic twist accuracy by simply getting rid of all genuine twist contributions in a CGC amplitude. Finally we compare the amplitudes obtained via a proper kinematic twist expansion to those obtained via a more standard dilute expansion to show the relation between the iTMD framework and the dilute low $x$ framework. |
0810.1171 | Alexandros Karanikas | A.I. Karanikas and C.N. Ktorides | Non-Perturbative Regge Exchange in Meson-Meson Scattering: An Analysis
Based on the Stochastic Vacuum Model | 17 pages | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Employing the Worldline casting of the Dosch-Simonov Stochastic Vacuum
Model(SVM) for QCD, a simulated meson-meson scattering is studied in the Regge
kinematical regime. The process is modelled in terms of the "helicoidal" Wilson
contour first introduced by Janic and Peschanski in a related study based on an
AdS/CFT-type approach. Using lattice supported estimations for the behavior of
a two-point, field strength correlation function, as defined in the framework
of the SVM, the reggeon slope and intercept are calculated in a semiclassical
approximation. The resulting values are in good agreement with the accepted
phenomenological ones. Going beyond this approximation, the contribution
resulting from boundary fluctuations of the Wilson loop contour is also
estimated.
| [
{
"created": "Tue, 7 Oct 2008 12:06:45 GMT",
"version": "v1"
}
] | 2008-10-08 | [
[
"Karanikas",
"A. I.",
""
],
[
"Ktorides",
"C. N.",
""
]
] | Employing the Worldline casting of the Dosch-Simonov Stochastic Vacuum Model(SVM) for QCD, a simulated meson-meson scattering is studied in the Regge kinematical regime. The process is modelled in terms of the "helicoidal" Wilson contour first introduced by Janic and Peschanski in a related study based on an AdS/CFT-type approach. Using lattice supported estimations for the behavior of a two-point, field strength correlation function, as defined in the framework of the SVM, the reggeon slope and intercept are calculated in a semiclassical approximation. The resulting values are in good agreement with the accepted phenomenological ones. Going beyond this approximation, the contribution resulting from boundary fluctuations of the Wilson loop contour is also estimated. |
hep-ph/0512135 | Muneyuki Ishida | Keiji Igi (RIKEN) and Muneyuki Ishida (Meisei univ.) | On the Discrepancy of pp, pbar p Total Cross Sections at sqrt s = 1.8TeV | 10 pages, 3 figures, uses ptptex.sty | Prog.Theor.Phys.115:601-609,2006 | 10.1143/PTP.115.601 | null | hep-ph | null | Based on the previous approach, we have investigated a possibility to resolve
the discrepancy between the E710, E811 and CDF at sqrt s =1.8TeV, using the
experimental data of the pp, pbar p total cross sections sigma tot(+) and
rho(+)$ ratio up to the SPS experiments (sqrt s = 0.9TeV) as inputs. We predict
sigma tot(pbar p) and rho(pbar p) at the Tevatron energy(sqrt s=1.8TeV) as
sigma tot(pbar p)=75.9+- 1.0mb, rho(pbar p)=0.136+- 0.005.
It turns out that only the data of E710 is consistent with the prediction in
the one standard deviation. So we can conclude that E710 is preferable but we
can exclude neither CDF nor E811 results.
| [
{
"created": "Sun, 11 Dec 2005 23:37:17 GMT",
"version": "v1"
}
] | 2011-03-23 | [
[
"Igi",
"Keiji",
"",
"RIKEN"
],
[
"Ishida",
"Muneyuki",
"",
"Meisei univ."
]
] | Based on the previous approach, we have investigated a possibility to resolve the discrepancy between the E710, E811 and CDF at sqrt s =1.8TeV, using the experimental data of the pp, pbar p total cross sections sigma tot(+) and rho(+)$ ratio up to the SPS experiments (sqrt s = 0.9TeV) as inputs. We predict sigma tot(pbar p) and rho(pbar p) at the Tevatron energy(sqrt s=1.8TeV) as sigma tot(pbar p)=75.9+- 1.0mb, rho(pbar p)=0.136+- 0.005. It turns out that only the data of E710 is consistent with the prediction in the one standard deviation. So we can conclude that E710 is preferable but we can exclude neither CDF nor E811 results. |
0710.2271 | Annelies Van Dyck | A. Van Dyck, T. Van Cauteren, J. Ryckebusch | Support of generalized parton distributions in Bethe-Salpeter models of
hadrons | 8 pages, 4 figures. v2: specific calculation included, references and
figure added. Submitted to Phys. Lett. B | Phys.Lett.B662:413-416,2008 | 10.1016/j.physletb.2008.03.031 | null | hep-ph | null | The proper support of generalized parton distributions from relativistic
constituent quark models with pointlike constituents is studied. The correct
support is guaranteed when the vertex function does not depend on the relative
minus-momentum. We show that including quark interactions in models with
pointlike constituent quarks might lead to a support problem. A computation of
the magnitude of the support problem in the Bonn relativistic constituent quark
model is presented.
| [
{
"created": "Thu, 11 Oct 2007 15:57:28 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Dec 2007 17:56:55 GMT",
"version": "v2"
},
{
"created": "Fri, 1 Feb 2008 16:24:28 GMT",
"version": "v3"
}
] | 2010-12-13 | [
[
"Van Dyck",
"A.",
""
],
[
"Van Cauteren",
"T.",
""
],
[
"Ryckebusch",
"J.",
""
]
] | The proper support of generalized parton distributions from relativistic constituent quark models with pointlike constituents is studied. The correct support is guaranteed when the vertex function does not depend on the relative minus-momentum. We show that including quark interactions in models with pointlike constituent quarks might lead to a support problem. A computation of the magnitude of the support problem in the Bonn relativistic constituent quark model is presented. |
2106.14429 | Tanmay Maji | Jiawei Zhu, Daekyoung Kang, Tanmay Maji | Angularity in DIS at next-to-next-to-leading log accuracy | 37 pages, 7 figuers, 1 table | JHEP 2111, 026 (2021) | 10.1007/JHEP11(2021)026 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Angularity is a class of event-shape observables that can be measured in
deep-inelastic scattering. With its continuous parameter $a$ one can
interpolate angularity between thrust and broadening and further access beyond
the region. Providing such systematic way to access various observables makes
angularity attractive in analysis with event shapes. We give the definition of
angularity for DIS and factorize the cross-section by using soft-collinear
effective theory. The factorization is valid in a wide range of $a$ below and
above thrust region but invalid in broadening limit. It contains an angularity
beam function, which is new result and we give the expression at
$\mathcal{O}(\as)$. We also perform large log resummation of angularity and
make predictions at various values of $a$ at next-to-next-to-leading log
accuracy.
| [
{
"created": "Mon, 28 Jun 2021 07:16:02 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Oct 2021 14:12:55 GMT",
"version": "v2"
},
{
"created": "Sat, 20 Nov 2021 08:25:02 GMT",
"version": "v3"
}
] | 2022-01-17 | [
[
"Zhu",
"Jiawei",
""
],
[
"Kang",
"Daekyoung",
""
],
[
"Maji",
"Tanmay",
""
]
] | Angularity is a class of event-shape observables that can be measured in deep-inelastic scattering. With its continuous parameter $a$ one can interpolate angularity between thrust and broadening and further access beyond the region. Providing such systematic way to access various observables makes angularity attractive in analysis with event shapes. We give the definition of angularity for DIS and factorize the cross-section by using soft-collinear effective theory. The factorization is valid in a wide range of $a$ below and above thrust region but invalid in broadening limit. It contains an angularity beam function, which is new result and we give the expression at $\mathcal{O}(\as)$. We also perform large log resummation of angularity and make predictions at various values of $a$ at next-to-next-to-leading log accuracy. |
2202.09882 | Masud Chaichian | Iver Brevik and Masud Chaichian | Electric Current and Heat Production by a Neutral Carrier: An Effect of
the Axion | 13 pages; v2: references added | null | 10.1140/epjc/s10052-022-10150-1 | null | hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | A general axion-electrodynamic formalism is presented on the phenomenological
level when the environment is dielectric (permittivity and permeability assumed
to be constants). Thereafter, a strong and uniform magnetic field is considered
in the $z$ direction, the field region having the form of a long material
cylinder (which corresponds to the haloscope setup). If the axion amplitude
depends on time only, the axions give rise to an oscillating electric current
in the $z$ direction. We estimate the magnitudes of the azimuthal magnetic
fields and the accompanying Joule heating in the cylinder, taking the cylinder
to have ordinary dissipative properties. We evaluate and calculate the electric
current and the heat production separately, without using the effective
approximation, both when there is a strong magnetic field and when there is a
strong electric one, showing that with the magnetic field there is a heat
production, while with the electric field there is not.
The heat generation that we consider, is a nontrivial effect as it is
generated by the electrically neutral axions, and has obvious consequences for
axion thermodynamics. The heat production can moreover have an additional
advantage, since the effect is accumulative and so grows with time. The
boundary conditions (in a classical sense) are explained and the use of them in
a quantum mechanical context is discussed. This point is nontrivial,
accentuated in particular in connection with the Casimir effect. For comparison
purposes, we present finally some results for heat dissipation taken from the
theory of viscous cosmology.
| [
{
"created": "Sun, 20 Feb 2022 18:09:51 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Feb 2022 15:59:34 GMT",
"version": "v2"
}
] | 2022-03-23 | [
[
"Brevik",
"Iver",
""
],
[
"Chaichian",
"Masud",
""
]
] | A general axion-electrodynamic formalism is presented on the phenomenological level when the environment is dielectric (permittivity and permeability assumed to be constants). Thereafter, a strong and uniform magnetic field is considered in the $z$ direction, the field region having the form of a long material cylinder (which corresponds to the haloscope setup). If the axion amplitude depends on time only, the axions give rise to an oscillating electric current in the $z$ direction. We estimate the magnitudes of the azimuthal magnetic fields and the accompanying Joule heating in the cylinder, taking the cylinder to have ordinary dissipative properties. We evaluate and calculate the electric current and the heat production separately, without using the effective approximation, both when there is a strong magnetic field and when there is a strong electric one, showing that with the magnetic field there is a heat production, while with the electric field there is not. The heat generation that we consider, is a nontrivial effect as it is generated by the electrically neutral axions, and has obvious consequences for axion thermodynamics. The heat production can moreover have an additional advantage, since the effect is accumulative and so grows with time. The boundary conditions (in a classical sense) are explained and the use of them in a quantum mechanical context is discussed. This point is nontrivial, accentuated in particular in connection with the Casimir effect. For comparison purposes, we present finally some results for heat dissipation taken from the theory of viscous cosmology. |
1609.00943 | Kai Ma | Kaoru Hagiwara, Kai Ma, Shingo Mori | Probing CP violation in $h\to \tau^{-}\tau^{+}$ at the LHC | 5 pages, 4 figures; v2: accepted version by PRL. Some typos are
corrected, texts and figures are also improved | Phys. Rev. Lett. 118, 171802 (2017) | 10.1103/PhysRevLett.118.171802 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a novel method to reconstruct event by event the full kinematics
of the cascade decay process, $h \to \tau^+\tau^- \to (\pi^+ \bar{\nu}) (\pi^-
\nu)$, which allows us to measure the $\tau^+\tau^-$ spin correlation, a
measure of the CP property of the Higgs boson. By noting that the $\tau^{\pm}$
momenta lie on the plane spanned by the accurately measured impact parameter
and momentum vectors of charged pions, we can obtain the most likely momenta of
the two missing neutrinos by using the probability distribution functions of
the $\met$ vector and the location of the primary vertex. A simple detector
level simulation shows an excellent agreement between the reconstructed and the
true kinematics, both in the $\tau^+\tau^-$ and the $\pi^+\pi^-$ rest frames.
The method can be tested in $Z \to \tau^+\tau^-$ events, which should exhibit
no correlation.
| [
{
"created": "Sun, 4 Sep 2016 14:58:12 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Apr 2017 01:52:47 GMT",
"version": "v2"
}
] | 2017-05-03 | [
[
"Hagiwara",
"Kaoru",
""
],
[
"Ma",
"Kai",
""
],
[
"Mori",
"Shingo",
""
]
] | We propose a novel method to reconstruct event by event the full kinematics of the cascade decay process, $h \to \tau^+\tau^- \to (\pi^+ \bar{\nu}) (\pi^- \nu)$, which allows us to measure the $\tau^+\tau^-$ spin correlation, a measure of the CP property of the Higgs boson. By noting that the $\tau^{\pm}$ momenta lie on the plane spanned by the accurately measured impact parameter and momentum vectors of charged pions, we can obtain the most likely momenta of the two missing neutrinos by using the probability distribution functions of the $\met$ vector and the location of the primary vertex. A simple detector level simulation shows an excellent agreement between the reconstructed and the true kinematics, both in the $\tau^+\tau^-$ and the $\pi^+\pi^-$ rest frames. The method can be tested in $Z \to \tau^+\tau^-$ events, which should exhibit no correlation. |
0705.4419 | Zurab Tavartkiladze | K.S. Babu, Abdel G. Bachri, Zurab Tavartkiladze | Predictive Model of Inverted Neutrino Mass Hierarchy and Resonant
Leptogenesis | Model slightly improved, references added, version will appear in
IJMP | Int.J.Mod.Phys.A23:1679-1696,2008 | 10.1142/S0217751X08039761 | OSU-HEP-07-01 | hep-ph | null | We present a new realization of inverted neutrino mass hierarchy based on
$S_3 \times {\cal U}(1)$ flavor symmetry. In this scenario, the deviation of
the solar oscillation angle from $\pi/4$ is correlated with the value of
$\theta_{13}$, as they are both induced by a common mixing angle in the charged
lepton sector. We find several interesting predictions: $\te_{13}\geq 0.13$,
$\sin^2\te_{12}\geq 0.31$, $\sin^2\te_{23}\simeq 0.5$ and $0\leq \cos \de \leq
0.7$ for the neutrino oscillation parameters and $0.01 {\rm
eV}\stackrel{<}{_\sim}m_{\bt \bt}\stackrel{<}{_\sim} 0.02 {\rm eV}$ for the
effective neutrino mass in neutrino-less double $\bt $-decay. We show that our
scenario can also explain naturally the observed baryon asymmetry of the
universe via resonant leptogenesis. The masses of the decaying right--handed
neutrinos can be in the range $(10^3 - 10^7)$ GeV, which would avoid the
generic gravitino problem of supersymmetric models.
| [
{
"created": "Wed, 30 May 2007 15:40:59 GMT",
"version": "v1"
},
{
"created": "Sat, 11 Aug 2007 00:15:44 GMT",
"version": "v2"
},
{
"created": "Mon, 3 Mar 2008 19:17:14 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Babu",
"K. S.",
""
],
[
"Bachri",
"Abdel G.",
""
],
[
"Tavartkiladze",
"Zurab",
""
]
] | We present a new realization of inverted neutrino mass hierarchy based on $S_3 \times {\cal U}(1)$ flavor symmetry. In this scenario, the deviation of the solar oscillation angle from $\pi/4$ is correlated with the value of $\theta_{13}$, as they are both induced by a common mixing angle in the charged lepton sector. We find several interesting predictions: $\te_{13}\geq 0.13$, $\sin^2\te_{12}\geq 0.31$, $\sin^2\te_{23}\simeq 0.5$ and $0\leq \cos \de \leq 0.7$ for the neutrino oscillation parameters and $0.01 {\rm eV}\stackrel{<}{_\sim}m_{\bt \bt}\stackrel{<}{_\sim} 0.02 {\rm eV}$ for the effective neutrino mass in neutrino-less double $\bt $-decay. We show that our scenario can also explain naturally the observed baryon asymmetry of the universe via resonant leptogenesis. The masses of the decaying right--handed neutrinos can be in the range $(10^3 - 10^7)$ GeV, which would avoid the generic gravitino problem of supersymmetric models. |
1501.00784 | Zhi-Tian Zou | Zhi-Tian Zou, Ahmed Ali, Cai-Dian Lu, Xin Liu, Ying Li | Improved Estimates of The $B_{(s)}\to V V$ Decays in Perturbative QCD
Approach | one figure, twelve Tables | Phys. Rev. D 91, 054033 (2015) | 10.1103/PhysRevD.91.054033 | DESY 15-001 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We reexamine the branching ratios, $CP$-asymmetries, and other observables in
a large number of $B_q\to VV(q=u,d,s)$ decays in the perturbative QCD (PQCD)
approach, where $V$ denotes a light vector meson $(\rho, K^*, \omega, \phi)$.
The essential difference between this work and the earlier similar works is of
parametric origin and in the estimates of the power corrections related to the
ratio $r_i^2=m_{V_i}^2/m_B^2(i=2,3)$ ($m_V$ and $m_B$ denote the masses of the
vector and $B$ meson, respectively). In particular, we use up-to-date
distribution amplitudes for the final state mesons and keep the terms
proportional to the ratio $r_i^2$ in our calculations. Our updated calculations
are in agreement with the experimental data, except for a limited number of
decays which we discuss. We emphasize that the penguin annihilation and the
hard-scattering emission contributions are essential to understand the
polarization anomaly, such as in the $B\to \phi K^*$ and $B_s \to \phi\phi$
decay modes. We also compare our results with those obtained in the QCD
factorization (QCDF) approach and comment on the similarities and differences,
which can be used to discriminate between these approaches in future
experiments.
| [
{
"created": "Mon, 5 Jan 2015 08:31:37 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Jan 2015 03:21:10 GMT",
"version": "v2"
}
] | 2015-04-01 | [
[
"Zou",
"Zhi-Tian",
""
],
[
"Ali",
"Ahmed",
""
],
[
"Lu",
"Cai-Dian",
""
],
[
"Liu",
"Xin",
""
],
[
"Li",
"Ying",
""
]
] | We reexamine the branching ratios, $CP$-asymmetries, and other observables in a large number of $B_q\to VV(q=u,d,s)$ decays in the perturbative QCD (PQCD) approach, where $V$ denotes a light vector meson $(\rho, K^*, \omega, \phi)$. The essential difference between this work and the earlier similar works is of parametric origin and in the estimates of the power corrections related to the ratio $r_i^2=m_{V_i}^2/m_B^2(i=2,3)$ ($m_V$ and $m_B$ denote the masses of the vector and $B$ meson, respectively). In particular, we use up-to-date distribution amplitudes for the final state mesons and keep the terms proportional to the ratio $r_i^2$ in our calculations. Our updated calculations are in agreement with the experimental data, except for a limited number of decays which we discuss. We emphasize that the penguin annihilation and the hard-scattering emission contributions are essential to understand the polarization anomaly, such as in the $B\to \phi K^*$ and $B_s \to \phi\phi$ decay modes. We also compare our results with those obtained in the QCD factorization (QCDF) approach and comment on the similarities and differences, which can be used to discriminate between these approaches in future experiments. |
hep-ph/9401290 | Ferenc Csikor | F. Csikor and I. Montvay | Grand unification for mirror fermions | 9 pages, Standard Latex (46kb). 3 figures not included, available by
anonymous ftp from hal9000.elte.hu, in directory /arch/pub/result/plot.ps
(46kb) or /arch/pub/result/plot.tex (1247kb), standard latex file. DESY
94-006, ITP-Budapest Rep. No. 505 | Phys.Lett. B324 (1994) 412-417 | 10.1016/0370-2693(94)90215-1 | null | hep-ph | null | The possibility of grand unification of the standard model (SM) with fermion
spectrum extended to include mirror fermions is examined. SM gauge couplings do
not automatically unify. SO(10) grand unification is studied with one
intermediate scale. Renormalization group equations (RGE) for fermion Yukawa
couplings and the scalar self-coupling are studied numerically at one and two
loop level. Strong restrictions for mirror fermion masses are obtained assuming
perturbative unification. Mirror masses much smaller than the tree unitarity
bounds are required. In particular mirror leptons have to be around 50 GeV.
Consistency of the mirror fermion model with LEP precision data is established.
A direct search for single production of mirror neutrinos at LEP could exclude
or confirm the GUT version of the mirror fermion model.
| [
{
"created": "Thu, 20 Jan 1994 09:30:56 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Csikor",
"F.",
""
],
[
"Montvay",
"I.",
""
]
] | The possibility of grand unification of the standard model (SM) with fermion spectrum extended to include mirror fermions is examined. SM gauge couplings do not automatically unify. SO(10) grand unification is studied with one intermediate scale. Renormalization group equations (RGE) for fermion Yukawa couplings and the scalar self-coupling are studied numerically at one and two loop level. Strong restrictions for mirror fermion masses are obtained assuming perturbative unification. Mirror masses much smaller than the tree unitarity bounds are required. In particular mirror leptons have to be around 50 GeV. Consistency of the mirror fermion model with LEP precision data is established. A direct search for single production of mirror neutrinos at LEP could exclude or confirm the GUT version of the mirror fermion model. |
0905.4509 | Sean Tulin | Daniel J. H. Chung, Bjorn Garbrecht, Michael J. Ramsey-Musolf, Sean
Tulin | Lepton-mediated electroweak baryogenesis | 26 pages, 5 figures | Phys.Rev.D81:063506,2010 | 10.1103/PhysRevD.81.063506 | NPAC-09-05 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the impact of the tau and bottom Yukawa couplings on the
transport dynamics for electroweak baryogenesis in supersymmetric extensions of
the Standard Model. Although it has generally been assumed in the literature
that all Yukawa interactions except those involving the top quark are
negligible, we find that the tau and bottom Yukawa interaction rates are too
fast to be neglected. We identify an illustrative "lepton-mediated electroweak
baryogenesis" scenario in which the baryon asymmetry is induced mainly through
the presence of a left-handed leptonic charge. We derive analytic formulae for
the computation of the baryon asymmetry that, in light of these effects, are
qualitatively different from those in the established literature. In this
scenario, for fixed CP-violating phases, the baryon asymmetry has opposite sign
compared to that calculated using established formulae.
| [
{
"created": "Wed, 27 May 2009 20:57:05 GMT",
"version": "v1"
}
] | 2010-04-06 | [
[
"Chung",
"Daniel J. H.",
""
],
[
"Garbrecht",
"Bjorn",
""
],
[
"Ramsey-Musolf",
"Michael J.",
""
],
[
"Tulin",
"Sean",
""
]
] | We investigate the impact of the tau and bottom Yukawa couplings on the transport dynamics for electroweak baryogenesis in supersymmetric extensions of the Standard Model. Although it has generally been assumed in the literature that all Yukawa interactions except those involving the top quark are negligible, we find that the tau and bottom Yukawa interaction rates are too fast to be neglected. We identify an illustrative "lepton-mediated electroweak baryogenesis" scenario in which the baryon asymmetry is induced mainly through the presence of a left-handed leptonic charge. We derive analytic formulae for the computation of the baryon asymmetry that, in light of these effects, are qualitatively different from those in the established literature. In this scenario, for fixed CP-violating phases, the baryon asymmetry has opposite sign compared to that calculated using established formulae. |
1008.1796 | Yu Gao | Vernon Barger, Y. Gao, Mathew McCaskey, Gabe Shaughnessy | Light Higgs Boson, Light Dark Matter and Gamma Rays | 19 pages, 7 figures, 1 table | Phys.Rev.D82:095011,2010 | 10.1103/PhysRevD.82.095011 | null | hep-ph astro-ph.HE hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A light Higgs boson is preferred by $M_W$ and $m_t$ measurements. A complex
scalar singlet addition to the Standard Model allows a better fit to these
measurements through a new light singlet dominated state. It then predicts a
light Dark Matter (DM) particle that can explain the signals of DM scattering
from nuclei in the CoGeNT and DAMA/LIBRA experiments. Annihilations of this DM
in the galactic halo, $AA\rightarrow b\bar{b}, c\bar{c}, \tau^+\tau^-$, lead to
gamma rays that naturally improve a fit to the Fermi Large Area Telescope data
in the central galactic regions. The associated light neutral Higgs boson may
also be discovered at the Large Hadron Collider.
| [
{
"created": "Tue, 10 Aug 2010 20:18:31 GMT",
"version": "v1"
}
] | 2010-12-23 | [
[
"Barger",
"Vernon",
""
],
[
"Gao",
"Y.",
""
],
[
"McCaskey",
"Mathew",
""
],
[
"Shaughnessy",
"Gabe",
""
]
] | A light Higgs boson is preferred by $M_W$ and $m_t$ measurements. A complex scalar singlet addition to the Standard Model allows a better fit to these measurements through a new light singlet dominated state. It then predicts a light Dark Matter (DM) particle that can explain the signals of DM scattering from nuclei in the CoGeNT and DAMA/LIBRA experiments. Annihilations of this DM in the galactic halo, $AA\rightarrow b\bar{b}, c\bar{c}, \tau^+\tau^-$, lead to gamma rays that naturally improve a fit to the Fermi Large Area Telescope data in the central galactic regions. The associated light neutral Higgs boson may also be discovered at the Large Hadron Collider. |
1307.5178 | Philip G. Ratcliffe | Gabriele Re Calegari and Philip G. Ratcliffe | Single Transverse-Spin Asymmetries in Drell-Yan Processes | 8 pages, 3 figures, final version, accepted for publication in Eur.
Phys. J. C | null | 10.1140/epjc/s10052-014-2769-7 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The asymmetry in the angular distribution of Drell--Yan dilepton pairs
generated in collisions where just one nucleon is transversely polarised has
been examined in the literature with a variety of results, mainly differing by
factors of two. We re-evaluate the asymmetry via twist-3 contributions in
collinear factorisation. In order to allow complete and in-depth comparison
with existing calculations, we supply all calculational details.
| [
{
"created": "Fri, 19 Jul 2013 11:06:16 GMT",
"version": "v1"
},
{
"created": "Thu, 12 Sep 2013 20:59:40 GMT",
"version": "v2"
},
{
"created": "Fri, 21 Feb 2014 14:57:09 GMT",
"version": "v3"
}
] | 2014-02-24 | [
[
"Calegari",
"Gabriele Re",
""
],
[
"Ratcliffe",
"Philip G.",
""
]
] | The asymmetry in the angular distribution of Drell--Yan dilepton pairs generated in collisions where just one nucleon is transversely polarised has been examined in the literature with a variety of results, mainly differing by factors of two. We re-evaluate the asymmetry via twist-3 contributions in collinear factorisation. In order to allow complete and in-depth comparison with existing calculations, we supply all calculational details. |
1704.08903 | Marco Martini | Marco Martini | Status and challenges of neutrino cross sections | Talk presented at NuPhys2016 (London, 12-14 December 2016). 8 pages,
LaTeX, 1 eps figure | null | null | NuPhys2016-Martini | hep-ph hep-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Neutrino oscillations physics entered in the precision era. In this context
accelerator-based neutrino experiments need a reduction of systematic errors to
the level of a few percent. Today one of the most important sources of
systematic errors are the neutrino-nucleus cross sections. The status of our
knowledge of these cross sections in the different open channels in the few-GeV
region, i.e. the quasielastic, the pion production and the multinucleon
emission, is reviewed. Special emphasis is devoted to the multinucleon emission
channel, which attracted a lot of attention in the last few years. It is
crucial to properly reconstruct the neutrino energy which enters the expression
of the oscillation probability. This channel was not included in the generators
used for the analyses of the neutrino cross sections and oscillations
experiments.
| [
{
"created": "Fri, 28 Apr 2017 12:38:23 GMT",
"version": "v1"
}
] | 2017-05-01 | [
[
"Martini",
"Marco",
""
]
] | Neutrino oscillations physics entered in the precision era. In this context accelerator-based neutrino experiments need a reduction of systematic errors to the level of a few percent. Today one of the most important sources of systematic errors are the neutrino-nucleus cross sections. The status of our knowledge of these cross sections in the different open channels in the few-GeV region, i.e. the quasielastic, the pion production and the multinucleon emission, is reviewed. Special emphasis is devoted to the multinucleon emission channel, which attracted a lot of attention in the last few years. It is crucial to properly reconstruct the neutrino energy which enters the expression of the oscillation probability. This channel was not included in the generators used for the analyses of the neutrino cross sections and oscillations experiments. |
hep-ph/0409241 | Werner Porod | D. Aristizabal Sierra, M. Hirsch and W. Porod | R-parity violating sneutrino decays | 16 pages, 6 figures; typos corrected | JHEP 0509:033,2005 | 10.1088/1126-6708/2005/09/033 | IFIC/04-50, ZU-TH 15/04 | hep-ph | null | R-parity can be violated through either bilinear and/or trilinear terms in
the superpotential. The decay properties of sneutrinos can be used to obtain
information about the relative importance of these couplings provided
sneutrinos are the lightest supersymmetric particles. We show that in some
specific scenarios it is even possible to decide whether bilinear or trilinear
terms give the dominant contribution to the neutrino mass matrix.
| [
{
"created": "Tue, 21 Sep 2004 08:36:58 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Jul 2005 11:07:28 GMT",
"version": "v2"
},
{
"created": "Wed, 3 Aug 2005 11:14:52 GMT",
"version": "v3"
}
] | 2010-02-03 | [
[
"Sierra",
"D. Aristizabal",
""
],
[
"Hirsch",
"M.",
""
],
[
"Porod",
"W.",
""
]
] | R-parity can be violated through either bilinear and/or trilinear terms in the superpotential. The decay properties of sneutrinos can be used to obtain information about the relative importance of these couplings provided sneutrinos are the lightest supersymmetric particles. We show that in some specific scenarios it is even possible to decide whether bilinear or trilinear terms give the dominant contribution to the neutrino mass matrix. |
1509.00160 | Horst Stoecker | Horst Stoecker, Kai Zhou, Stefan Schramm, Florian Senzel, Carsten
Greiner, Maxim Beitel, Kai Gallmeister, Mark Gorenstein, Igor Mishustin,
David Vasak, Jan Steinheimer, Juergen Struckmeier, Volodymyr Vovchenko,
Leonid Satarov, Zhe Xu, Pengfei Zhuang, Laszlo P. Csernai, Bikash Sinha,
Sibaji Raha, Tam\'as S\'andor Bir\'o, Marco Panero | Glueballs amass at RHIC and LHC Colliders! - The early quarkless 1st
order phase transition at $T=270$ MeV - from pure Yang-Mills glue plasma to
GlueBall-Hagedorn states | 7 pages, 6 figures; | J. Phys. G 43 (2016) 1, 015105 | 10.1088/0954-3899/43/1/015105 | null | hep-ph nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The early stage of high multiplicity pp, pA and AA collider is represented by
a nearly quarkless, hot, deconfined pure gluon plasma. According to pure
Yang-Mills Lattice Gauge Theory, this hot pure glue matter undergoes, at a high
temperature, $T_c = 270$ MeV, a first order phase transition into a confined
Hagedorn-GlueBall fluid. These new scenario should be characterized by a
suppression of high $p_T$ photons and dileptons, baryon suppression and
enhanced strange meson production. We propose to observe this newly predicted
class of events at LHC and RHIC.
| [
{
"created": "Tue, 1 Sep 2015 07:14:51 GMT",
"version": "v1"
}
] | 2016-01-18 | [
[
"Stoecker",
"Horst",
""
],
[
"Zhou",
"Kai",
""
],
[
"Schramm",
"Stefan",
""
],
[
"Senzel",
"Florian",
""
],
[
"Greiner",
"Carsten",
""
],
[
"Beitel",
"Maxim",
""
],
[
"Gallmeister",
"Kai",
""
],
[
"Gorenstein",
"Mark",
""
],
[
"Mishustin",
"Igor",
""
],
[
"Vasak",
"David",
""
],
[
"Steinheimer",
"Jan",
""
],
[
"Struckmeier",
"Juergen",
""
],
[
"Vovchenko",
"Volodymyr",
""
],
[
"Satarov",
"Leonid",
""
],
[
"Xu",
"Zhe",
""
],
[
"Zhuang",
"Pengfei",
""
],
[
"Csernai",
"Laszlo P.",
""
],
[
"Sinha",
"Bikash",
""
],
[
"Raha",
"Sibaji",
""
],
[
"Biró",
"Tamás Sándor",
""
],
[
"Panero",
"Marco",
""
]
] | The early stage of high multiplicity pp, pA and AA collider is represented by a nearly quarkless, hot, deconfined pure gluon plasma. According to pure Yang-Mills Lattice Gauge Theory, this hot pure glue matter undergoes, at a high temperature, $T_c = 270$ MeV, a first order phase transition into a confined Hagedorn-GlueBall fluid. These new scenario should be characterized by a suppression of high $p_T$ photons and dileptons, baryon suppression and enhanced strange meson production. We propose to observe this newly predicted class of events at LHC and RHIC. |
2112.13223 | Raghunath Sahoo | Pei-Pin Yang, Mai-Ying Duan, Fu-Hu Liu, and Raghunath Sahoo | Analysis of identified particle transverse momentum spectra produced in
pp, p--Pb and Pb--Pb collisions at the LHC using Tsallis--Pareto-type
function | Please see the published version in the journal Symmetry following
the reference and DOI | Symmetry 2022, 14, 1530 | 10.3390/sym14081530 | null | hep-ph hep-ex nucl-ex nucl-th | http://creativecommons.org/licenses/by-sa/4.0/ | In the framework of a multi-source thermal model at the partonic-level, we
have analyzed transverse momentum spectra of hadrons measured by the ALICE
Collaboration in proton-proton ($pp$ or $p$-$p$) collisions at the
center-of-mass energy of $\sqrt{s}=7$ and 13 TeV, proton-lead ($p$-Pb)
collisions at $\sqrt{s_{\rm NN}}=5.02$ TeV, and lead-lead (Pb-Pb) collisions at
$\sqrt{s_{\rm NN}}=2.76$ TeV. For meson(baryon), the contributions of
two(three) constituent quarks are considered, in which each quark contributes
to hadron transverse momentum to obey the revised phenomenological Tsallis
transverse momentum distribution for the Maxwell-Boltzmann particles (the
TP-like function in short) with isotropic random azimuthal angle. Three main
parameters, namely, the revised index $a_0$, effective temperature $T$, and
entropy-related index $n$ are obtained, which show the same tendency for small
and large systems with respect to the centrality (or multiplicity) of events,
rest mass of hadrons, and constituent mass of quarks.
| [
{
"created": "Sat, 25 Dec 2021 10:59:04 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Jul 2022 11:07:12 GMT",
"version": "v2"
}
] | 2022-07-28 | [
[
"Yang",
"Pei-Pin",
""
],
[
"Duan",
"Mai-Ying",
""
],
[
"Liu",
"Fu-Hu",
""
],
[
"Sahoo",
"Raghunath",
""
]
] | In the framework of a multi-source thermal model at the partonic-level, we have analyzed transverse momentum spectra of hadrons measured by the ALICE Collaboration in proton-proton ($pp$ or $p$-$p$) collisions at the center-of-mass energy of $\sqrt{s}=7$ and 13 TeV, proton-lead ($p$-Pb) collisions at $\sqrt{s_{\rm NN}}=5.02$ TeV, and lead-lead (Pb-Pb) collisions at $\sqrt{s_{\rm NN}}=2.76$ TeV. For meson(baryon), the contributions of two(three) constituent quarks are considered, in which each quark contributes to hadron transverse momentum to obey the revised phenomenological Tsallis transverse momentum distribution for the Maxwell-Boltzmann particles (the TP-like function in short) with isotropic random azimuthal angle. Three main parameters, namely, the revised index $a_0$, effective temperature $T$, and entropy-related index $n$ are obtained, which show the same tendency for small and large systems with respect to the centrality (or multiplicity) of events, rest mass of hadrons, and constituent mass of quarks. |
1003.2293 | Andrey Zayakin | A. Gorsky, P. N. Kopnin, A. V. Zayakin | On the Chiral Magnetic Effect in Soft-Wall AdS/QCD | 16 pages, no figures, references corrected | Phys.Rev.D83:014023,2011 | 10.1103/PhysRevD.83.014023 | ITEP-TH-07/10 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The essence of the chiral magnetic effect is generation of an electric
current along an external magnetic field. Recently it has been studied by
Rebhan et al. within the Sakai--Sugimoto model, where it was shown to be zero.
As an alternative, we calculate the chiral magnetic effect in soft-wall AdS/QCD
and find a non-zero result with the natural boundary conditions. The mechanism
of the dynamical neutralization of the chiral chemical potential via the string
production is discussed in the dual two-form representation.
| [
{
"created": "Thu, 11 Mar 2010 09:58:55 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Apr 2010 10:37:48 GMT",
"version": "v2"
},
{
"created": "Tue, 4 Jan 2011 00:35:02 GMT",
"version": "v3"
}
] | 2011-02-15 | [
[
"Gorsky",
"A.",
""
],
[
"Kopnin",
"P. N.",
""
],
[
"Zayakin",
"A. V.",
""
]
] | The essence of the chiral magnetic effect is generation of an electric current along an external magnetic field. Recently it has been studied by Rebhan et al. within the Sakai--Sugimoto model, where it was shown to be zero. As an alternative, we calculate the chiral magnetic effect in soft-wall AdS/QCD and find a non-zero result with the natural boundary conditions. The mechanism of the dynamical neutralization of the chiral chemical potential via the string production is discussed in the dual two-form representation. |
0707.3652 | Peter Zeiler Skands | Walter T. Giele, David A. Kosower, Peter Z. Skands | A simple shower and matching algorithm | 32 pages, 6 figures | Phys.Rev.D78:014026,2008 | 10.1103/PhysRevD.78.014026 | FERMILAB-PUB-07-160-T, Saclay/SPhT-T07/107 | hep-ph | null | We present a simple formalism for parton-shower Markov chains. As a first
step towards more complete uncertainty bands, we incorporate a comprehensive
exploration of the ambiguities inherent in such calculations. To reduce this
uncertainty, we then introduce a matching formalism which allows a generated
event sample to simultaneously reproduce any infrared safe distribution
calculated at leading or next-to-leading order in perturbation theory, up to
sub-leading corrections. To enable a more universal definition of perturbative
calculations, we also propose a more general definition of the hadronization
cutoff. Finally, we present an implementation of some of these ideas for
final-state gluon showers, in a code dubbed VINCIA.
| [
{
"created": "Wed, 25 Jul 2007 00:31:24 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Giele",
"Walter T.",
""
],
[
"Kosower",
"David A.",
""
],
[
"Skands",
"Peter Z.",
""
]
] | We present a simple formalism for parton-shower Markov chains. As a first step towards more complete uncertainty bands, we incorporate a comprehensive exploration of the ambiguities inherent in such calculations. To reduce this uncertainty, we then introduce a matching formalism which allows a generated event sample to simultaneously reproduce any infrared safe distribution calculated at leading or next-to-leading order in perturbation theory, up to sub-leading corrections. To enable a more universal definition of perturbative calculations, we also propose a more general definition of the hadronization cutoff. Finally, we present an implementation of some of these ideas for final-state gluon showers, in a code dubbed VINCIA. |
hep-ph/0203078 | Gorbunov | D.S. Gorbunov, N.V. Krasnikov | Prospects for sgoldstino search at the LHC | 12 pages, 12 figures; journal version: minor changes | JHEP 0207 (2002) 043 | 10.1088/1126-6708/2002/07/043 | null | hep-ph | null | In this paper we estimate the LHC sgoldstino discovery potential for the
signatures with gamma gamma and ZZ in a final state.
| [
{
"created": "Fri, 8 Mar 2002 11:11:58 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Aug 2002 14:05:53 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Gorbunov",
"D. S.",
""
],
[
"Krasnikov",
"N. V.",
""
]
] | In this paper we estimate the LHC sgoldstino discovery potential for the signatures with gamma gamma and ZZ in a final state. |
2009.04012 | Jaryd Ulbricht | Logan A. Morrison and Hiren H. Patel and Jaryd F. Ulbricht | Asymptotic analysis of the Boltzmann equation for dark matter relic
abundance | 15 pages, 6 figures | JCAP07(2021)024 | 10.1088/1475-7516/2021/07/024 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A solution to the Boltzmann equation governing the thermal relic abundance of
cold dark matter is constructed by matched asymptotic approximations. The
approximation of the relic density is an asymptotic series valid when the
abundance does not deviate significantly from its equilibrium value until small
temperatures. Resonance and threshold effects are taken into account at leading
order and found to be negligible unless the annihilation cross section is
negligible at threshold. Comparisons are made to previously attempted
constructions and to the freeze out approximation commonly employed in the
literature. Extensions to higher order matching is outlined, and implications
for solving related systems are discussed. We compare our results to a
numerical determination of the relic abundance using a benchmark model and find
a fantastic agreement. The method developed also serves as a solution to a wide
class of problems containing an infinite order turning point.
| [
{
"created": "Tue, 8 Sep 2020 22:37:25 GMT",
"version": "v1"
}
] | 2021-07-16 | [
[
"Morrison",
"Logan A.",
""
],
[
"Patel",
"Hiren H.",
""
],
[
"Ulbricht",
"Jaryd F.",
""
]
] | A solution to the Boltzmann equation governing the thermal relic abundance of cold dark matter is constructed by matched asymptotic approximations. The approximation of the relic density is an asymptotic series valid when the abundance does not deviate significantly from its equilibrium value until small temperatures. Resonance and threshold effects are taken into account at leading order and found to be negligible unless the annihilation cross section is negligible at threshold. Comparisons are made to previously attempted constructions and to the freeze out approximation commonly employed in the literature. Extensions to higher order matching is outlined, and implications for solving related systems are discussed. We compare our results to a numerical determination of the relic abundance using a benchmark model and find a fantastic agreement. The method developed also serves as a solution to a wide class of problems containing an infinite order turning point. |
2308.16897 | Sacha Davidson | Marco Ardu, Sacha Davidson, St\'ephane Lavignac | Distinguishing models with $\mu \to e $ observables | version accepted for publication (with a typo corrected in Eq 2.4) | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Upcoming experiments will improve the reach for the lepton flavour violating
(LFV) processes $\mu \to e \gamma$, $\mu \to e \bar{e} e$ and $\mu A \to e A$
by orders of magnitude. We investigate whether this upcoming data could rule
out some popular TeV-scale LFV models (the type II seesaw, the inverse seesaw
and a scalar leptoquark) using a bottom-up EFT approach involving twelve Wilson
coefficients that can in principle all be determined by experimental
measurements. In this 12-dimensional coefficient space, each model can only
predict points in a specific subspace; for instance, flavour change involving
singlet electrons is suppressed in the seesaw models, and the leptoquark
induces negligible coefficients for 4-lepton scalar operators. Using the fact
that none of these models can populate the whole region accessible to upcoming
experiments, we show that $\mu \to e$ experiments have the ability to rule them
out.
| [
{
"created": "Thu, 31 Aug 2023 17:57:43 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Jan 2024 18:20:10 GMT",
"version": "v2"
}
] | 2024-01-18 | [
[
"Ardu",
"Marco",
""
],
[
"Davidson",
"Sacha",
""
],
[
"Lavignac",
"Stéphane",
""
]
] | Upcoming experiments will improve the reach for the lepton flavour violating (LFV) processes $\mu \to e \gamma$, $\mu \to e \bar{e} e$ and $\mu A \to e A$ by orders of magnitude. We investigate whether this upcoming data could rule out some popular TeV-scale LFV models (the type II seesaw, the inverse seesaw and a scalar leptoquark) using a bottom-up EFT approach involving twelve Wilson coefficients that can in principle all be determined by experimental measurements. In this 12-dimensional coefficient space, each model can only predict points in a specific subspace; for instance, flavour change involving singlet electrons is suppressed in the seesaw models, and the leptoquark induces negligible coefficients for 4-lepton scalar operators. Using the fact that none of these models can populate the whole region accessible to upcoming experiments, we show that $\mu \to e$ experiments have the ability to rule them out. |
2005.10277 | Davide Pagani | Davide Pagani, Hua-Sheng Shao, Marco Zaro | RIP $H b \bar b$: How other Higgs production modes conspire to kill a
rare signal at the LHC | 33 pages, 8 figures, 4 tables. Version accepted for publication in
JHEP | JHEP 11 (2020) 036 | 10.1007/JHEP11(2020)036 | DESY 20-089, TIF-UNIMI-2020-16 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The hadroproduction of a Higgs boson in association with a bottom-quark pair
($H b \bar b$) is commonly considered as the key process for directly probing
the Yukawa interaction between the Higgs boson and the bottom quark ($y_b$).
However, in the Standard-Model (SM) this process is also known to suffer from
very large irreducible backgrounds from other Higgs production channels,
notably gluon-fusion ($gg$F). In this paper we calculate for the first time the
so-called QCD and electroweak complete-NLO predictions for $H b \bar b$
production, using the four-flavour scheme. Our calculation shows that not only
the $gg$F but also the $ZH$ and even the vector-boson fusion channels are
sizeable irreducible backgrounds. Moreover, we demonstrate that, at the LHC,
the rates of these backgrounds are very large with respect to the "genuine" and
$y_b$-dependent $H b \bar b$ production mode. In particular, no suppression
occurs at the differential level and therefore backgrounds survive typical
analysis cuts. This fact further jeopardises the chances of measuring at the
LHC the $y_b$-dependent component of $H b \bar b$ production in the SM.
Especially, unless $y_b$ is significantly enlarged by new physics, even for
beyond-the SM scenarios the direct determination of $y_b$ via this process
seems to be hopeless at the LHC.
| [
{
"created": "Wed, 20 May 2020 18:01:31 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Nov 2020 16:55:42 GMT",
"version": "v2"
}
] | 2020-11-19 | [
[
"Pagani",
"Davide",
""
],
[
"Shao",
"Hua-Sheng",
""
],
[
"Zaro",
"Marco",
""
]
] | The hadroproduction of a Higgs boson in association with a bottom-quark pair ($H b \bar b$) is commonly considered as the key process for directly probing the Yukawa interaction between the Higgs boson and the bottom quark ($y_b$). However, in the Standard-Model (SM) this process is also known to suffer from very large irreducible backgrounds from other Higgs production channels, notably gluon-fusion ($gg$F). In this paper we calculate for the first time the so-called QCD and electroweak complete-NLO predictions for $H b \bar b$ production, using the four-flavour scheme. Our calculation shows that not only the $gg$F but also the $ZH$ and even the vector-boson fusion channels are sizeable irreducible backgrounds. Moreover, we demonstrate that, at the LHC, the rates of these backgrounds are very large with respect to the "genuine" and $y_b$-dependent $H b \bar b$ production mode. In particular, no suppression occurs at the differential level and therefore backgrounds survive typical analysis cuts. This fact further jeopardises the chances of measuring at the LHC the $y_b$-dependent component of $H b \bar b$ production in the SM. Especially, unless $y_b$ is significantly enlarged by new physics, even for beyond-the SM scenarios the direct determination of $y_b$ via this process seems to be hopeless at the LHC. |
1309.0500 | Frank Siegert | Fabio Cascioli, Stefan Hoeche, Frank Krauss, Philipp Maierhofer,
Stefano Pozzorini, Frank Siegert | Precise Higgs-background predictions: merging NLO QCD and squared
quark-loop corrections to four-lepton + 0,1 jet production | 44 pages, 13 figures, 7 tables. v2: More detailed discussion of
merging-scale dependence in Sect. 3.3 and detailed assessment of
merging-scale uncertainties in Sect.5.3.; to appear in JHEP | null | 10.1007/JHEP01(2014)046 | IPPP/13/66, DCPT/13/132, MCNET-13-12, SLAC-PUB-15714, ZU-TH 15/13,
LPN13-056, FR-PHENO-2013-007 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present precise predictions for four-lepton plus jets production at the
LHC obtained within the fully automated Sherpa+OpenLoops framework. Off-shell
intermediate vector bosons and related interferences are consistently included
using the complex-mass scheme. Four-lepton plus 0- and 1-jet final states are
described at NLO accuracy, and the precision of the simulation is further
increased by squared quark-loop NNLO contributions in the gg -> 4l, gg -> 4l+g,
gq -> 4l+q, and qq -> 4l+g channels. These NLO and NNLO contributions are
matched to the Sherpa parton shower, and the 0- and 1-jet final states are
consistently merged using the MEPS@NLO technique. Thanks to Sudakov
resummation, the parton shower provides improved predictions and uncertainty
estimates for exclusive observables. This is important when jet vetoes or jet
bins are used to separate four-lepton final states arising from Higgs decays,
diboson production, and top-pair production. Detailed predictions are presented
for the ATLAS and CMS H->WW analyses at 8 TeV in the 0- and 1-jet bins.
Assessing renormalisation-, factorisation- and resummation-scale uncertainties,
which reflect also unknown subleading Sudakov logarithms in jet bins, we find
that residual perturbative uncertainties are as small as a few percent.
| [
{
"created": "Mon, 2 Sep 2013 19:54:10 GMT",
"version": "v1"
},
{
"created": "Sat, 25 Jan 2014 12:41:43 GMT",
"version": "v2"
}
] | 2015-06-17 | [
[
"Cascioli",
"Fabio",
""
],
[
"Hoeche",
"Stefan",
""
],
[
"Krauss",
"Frank",
""
],
[
"Maierhofer",
"Philipp",
""
],
[
"Pozzorini",
"Stefano",
""
],
[
"Siegert",
"Frank",
""
]
] | We present precise predictions for four-lepton plus jets production at the LHC obtained within the fully automated Sherpa+OpenLoops framework. Off-shell intermediate vector bosons and related interferences are consistently included using the complex-mass scheme. Four-lepton plus 0- and 1-jet final states are described at NLO accuracy, and the precision of the simulation is further increased by squared quark-loop NNLO contributions in the gg -> 4l, gg -> 4l+g, gq -> 4l+q, and qq -> 4l+g channels. These NLO and NNLO contributions are matched to the Sherpa parton shower, and the 0- and 1-jet final states are consistently merged using the MEPS@NLO technique. Thanks to Sudakov resummation, the parton shower provides improved predictions and uncertainty estimates for exclusive observables. This is important when jet vetoes or jet bins are used to separate four-lepton final states arising from Higgs decays, diboson production, and top-pair production. Detailed predictions are presented for the ATLAS and CMS H->WW analyses at 8 TeV in the 0- and 1-jet bins. Assessing renormalisation-, factorisation- and resummation-scale uncertainties, which reflect also unknown subleading Sudakov logarithms in jet bins, we find that residual perturbative uncertainties are as small as a few percent. |
1308.3043 | Siba Prasad Das Dr. | Pankaj Agrawal, Somnath Bandyopadhyay and Siba Prasad Das | Multilepton Signatures of the Higgs Boson through its Production in
Association with a Top-quark Pair | 11 pages, 1 Figure | Phys. Rev. D 88, 093008 (2013) | 10.1103/PhysRevD.88.093008 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the possible production of the Higgs Boson in association with a
top-quark pair and its subsequent decay into a tau-lepton pair or a W-boson
pair. This process can give rise to many signatures of the Higgs boson. These
signatures can have electrons, muons, tau jets, bottom jets and/or light
flavour jets. We analyze the viability of some of these signatures. We will
look at those signatures where the background is minimal. In particular, we
explore the viability of the signatures "isolated 4 electron/muon" and
"isolated 3 electron/muon + a jet" The jet can be due to a light flavour
quark/gluon, a bottom quark, or a tau lepton. Of all these signatures, we find
that "isolated 3 electron/muon + a tau jet", with an extra bottom jet, can be
an excellent signature of this mode of the Higgs boson production. We show that
this signature may be visible within a year, once the Large Hadron Collider
(LHC) restarts. Some of the other signatures would also be observable after the
LHC accumulates sufficient luminosity.
| [
{
"created": "Wed, 14 Aug 2013 06:16:27 GMT",
"version": "v1"
}
] | 2013-11-27 | [
[
"Agrawal",
"Pankaj",
""
],
[
"Bandyopadhyay",
"Somnath",
""
],
[
"Das",
"Siba Prasad",
""
]
] | We consider the possible production of the Higgs Boson in association with a top-quark pair and its subsequent decay into a tau-lepton pair or a W-boson pair. This process can give rise to many signatures of the Higgs boson. These signatures can have electrons, muons, tau jets, bottom jets and/or light flavour jets. We analyze the viability of some of these signatures. We will look at those signatures where the background is minimal. In particular, we explore the viability of the signatures "isolated 4 electron/muon" and "isolated 3 electron/muon + a jet" The jet can be due to a light flavour quark/gluon, a bottom quark, or a tau lepton. Of all these signatures, we find that "isolated 3 electron/muon + a tau jet", with an extra bottom jet, can be an excellent signature of this mode of the Higgs boson production. We show that this signature may be visible within a year, once the Large Hadron Collider (LHC) restarts. Some of the other signatures would also be observable after the LHC accumulates sufficient luminosity. |
2205.11712 | Yubing Dong | Yubing Dong and Pengnian Shen | Possible dibaryon production at $\bar{\rm{P}}$anda with a Lagrangian
approach | 15 pages, 5 figures | Chinese Physics C46 (2022), 023105 | 10.1088/1674-1137/ac3567 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | In order to confirm the existence of the dibaryon state $d^*(2380)$ observed
at WASA@COSY, we estimate the production of the possible dibaryon and
anti-dibaryon pair $d^*\bar{d}^*$ at the energy region of the upcoming
experiments at $\bar{\rm{P}}$anda. Based on some qualitative properties of
$d^*$ extracted from the analysez in the non-relativistic quark model, the
production cross section for this spin-3 particle pair are calculated with the
help of an phenomenological effective relativistic and covariant Lagrangian
approach.
| [
{
"created": "Tue, 24 May 2022 01:28:20 GMT",
"version": "v1"
}
] | 2022-05-25 | [
[
"Dong",
"Yubing",
""
],
[
"Shen",
"Pengnian",
""
]
] | In order to confirm the existence of the dibaryon state $d^*(2380)$ observed at WASA@COSY, we estimate the production of the possible dibaryon and anti-dibaryon pair $d^*\bar{d}^*$ at the energy region of the upcoming experiments at $\bar{\rm{P}}$anda. Based on some qualitative properties of $d^*$ extracted from the analysez in the non-relativistic quark model, the production cross section for this spin-3 particle pair are calculated with the help of an phenomenological effective relativistic and covariant Lagrangian approach. |
hep-ph/9906239 | P. G. Tinyakov | V. A. Rubakov, P. G. Tinyakov | Ruling out a higher spin field solution to the cosmological constant
problem | 7 pages, LaTeX | Phys.Rev. D61 (2000) 087503 | 10.1103/PhysRevD.61.087503 | INR-TH-99/117 | hep-ph astro-ph gr-qc | null | We consider the modification of Newton's gravity law in Dolgov's higher spin
models designed to compensate the cosmological constant. We find that the
effective Planck mass is unacceptably large in these models. We also point out
that the properties of gravitational waves are entirely different in these
models as compared to general relativity.
| [
{
"created": "Thu, 3 Jun 1999 18:13:22 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Rubakov",
"V. A.",
""
],
[
"Tinyakov",
"P. G.",
""
]
] | We consider the modification of Newton's gravity law in Dolgov's higher spin models designed to compensate the cosmological constant. We find that the effective Planck mass is unacceptably large in these models. We also point out that the properties of gravitational waves are entirely different in these models as compared to general relativity. |
1806.02780 | Wouter Dekens | V. Cirigliano, W. Dekens, J. de Vries, M. L. Graesser, and E.
Mereghetti | A neutrinoless double beta decay master formula from effective field
theory | Published version | JHEP 12 (2018) 097 | 10.1007/JHEP12(2018)097 | LA-UR-18-24895, Nikhef 2018-023 | hep-ph nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a master formula describing the neutrinoless-double-beta decay
($0\nu\beta\beta$) rate induced by lepton-number-violating (LNV) operators up
to dimension nine in the Standard Model Effective Field Theory. We provide an
end-to-end framework connecting the possibly very high LNV scale to the nuclear
scale, through a chain of effective field theories. Starting at the electroweak
scale, we integrate out the heavy Standard Model degrees of freedom and we
match to an $SU(3)_c\otimes U(1)_{\mathrm{em}}$ effective theory. After
evolving the resulting effective Lagrangian to the QCD scale, we use chiral
perturbation theory to derive the lepton-number-violating chiral Lagrangian.
The chiral Lagrangian is used to derive the two-nucleon $0\nu\beta\beta$
transition operators to leading order in the chiral power counting. Based on
renormalization arguments we show that in various cases short-range two-nucleon
operators need to be enhanced to leading order. We show that all required
nuclear matrix elements can be taken from existing calculations. Our final
result is a master formula that describes the $0\nu\beta\beta$ rate in terms of
phase-space factors, nuclear matrix elements, hadronic low-energy constants,
QCD evolution factors, and high-energy LNV Wilson coefficients, including all
the interference terms. Our master formula can be easily matched to any model
where LNV originates at energy scales above the electroweak scale. As an
explicit example, we match our formula to the minimal left-right-symmetric
model in which contributions of operators of different dimension compete, and
we discuss the resulting phenomenology.
| [
{
"created": "Thu, 7 Jun 2018 16:51:03 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Jan 2019 02:30:53 GMT",
"version": "v2"
}
] | 2019-01-24 | [
[
"Cirigliano",
"V.",
""
],
[
"Dekens",
"W.",
""
],
[
"de Vries",
"J.",
""
],
[
"Graesser",
"M. L.",
""
],
[
"Mereghetti",
"E.",
""
]
] | We present a master formula describing the neutrinoless-double-beta decay ($0\nu\beta\beta$) rate induced by lepton-number-violating (LNV) operators up to dimension nine in the Standard Model Effective Field Theory. We provide an end-to-end framework connecting the possibly very high LNV scale to the nuclear scale, through a chain of effective field theories. Starting at the electroweak scale, we integrate out the heavy Standard Model degrees of freedom and we match to an $SU(3)_c\otimes U(1)_{\mathrm{em}}$ effective theory. After evolving the resulting effective Lagrangian to the QCD scale, we use chiral perturbation theory to derive the lepton-number-violating chiral Lagrangian. The chiral Lagrangian is used to derive the two-nucleon $0\nu\beta\beta$ transition operators to leading order in the chiral power counting. Based on renormalization arguments we show that in various cases short-range two-nucleon operators need to be enhanced to leading order. We show that all required nuclear matrix elements can be taken from existing calculations. Our final result is a master formula that describes the $0\nu\beta\beta$ rate in terms of phase-space factors, nuclear matrix elements, hadronic low-energy constants, QCD evolution factors, and high-energy LNV Wilson coefficients, including all the interference terms. Our master formula can be easily matched to any model where LNV originates at energy scales above the electroweak scale. As an explicit example, we match our formula to the minimal left-right-symmetric model in which contributions of operators of different dimension compete, and we discuss the resulting phenomenology. |
1907.01556 | Bai-Long Hoid | Martin Hoferichter, Bai-Long Hoid, Bastian Kubis | Three-pion contribution to hadronic vacuum polarization | 24 pages, 1 figure; Appendix B added; version published in JHEP | JHEP 1908 (2019) 137 | 10.1007/JHEP08(2019)137 | INT-PUB-19-030 | hep-ph hep-ex hep-lat nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We address the contribution of the $3\pi$ channel to hadronic vacuum
polarization (HVP) using a dispersive representation of the $e^+e^-\to 3\pi$
amplitude. This channel gives the second-largest individual contribution to the
total HVP integral in the anomalous magnetic moment of the muon $(g-2)_\mu$,
both to its absolute value and uncertainty. It is largely dominated by the
narrow resonances $\omega$ and $\phi$, but not to the extent that the off-peak
regions were negligible, so that at the level of accuracy relevant for
$(g-2)_\mu$ an analysis of the available data as model independent as possible
becomes critical. Here, we provide such an analysis based on a global fit
function using analyticity and unitarity of the underlying $\gamma^*\to3\pi$
amplitude and its normalization from a chiral low-energy theorem, which, in
particular, allows us to check the internal consistency of the various
$e^+e^-\to 3\pi$ data sets. Overall, we obtain $a_\mu^{3\pi}|_{\leq
1.8\,\text{GeV}}=46.2(6)(6)\times 10^{-10}$ as our best estimate for the total
$3\pi$ contribution consistent with all (low-energy) constraints from QCD. In
combination with a recent dispersive analysis imposing the same constraints on
the $2\pi$ channel below $1\,\text{GeV}$, this covers nearly $80\%$ of the
total HVP contribution, leading to $a_\mu^\text{HVP}=692.3(3.3)\times 10^{-10}$
when the remainder is taken from the literature, and thus reaffirming the
$(g-2)_\mu$ anomaly at the level of at least $3.4\sigma$. As side products, we
find for the vacuum-polarization-subtracted masses
$M_\omega=782.63(3)(1)\,\text{MeV}$ and $M_\phi=1019.20(2)(1)\,\text{MeV}$,
confirming the tension to the $\omega$ mass as extracted from the $2\pi$
channel.
| [
{
"created": "Tue, 2 Jul 2019 18:00:00 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Sep 2019 07:29:26 GMT",
"version": "v2"
}
] | 2019-09-04 | [
[
"Hoferichter",
"Martin",
""
],
[
"Hoid",
"Bai-Long",
""
],
[
"Kubis",
"Bastian",
""
]
] | We address the contribution of the $3\pi$ channel to hadronic vacuum polarization (HVP) using a dispersive representation of the $e^+e^-\to 3\pi$ amplitude. This channel gives the second-largest individual contribution to the total HVP integral in the anomalous magnetic moment of the muon $(g-2)_\mu$, both to its absolute value and uncertainty. It is largely dominated by the narrow resonances $\omega$ and $\phi$, but not to the extent that the off-peak regions were negligible, so that at the level of accuracy relevant for $(g-2)_\mu$ an analysis of the available data as model independent as possible becomes critical. Here, we provide such an analysis based on a global fit function using analyticity and unitarity of the underlying $\gamma^*\to3\pi$ amplitude and its normalization from a chiral low-energy theorem, which, in particular, allows us to check the internal consistency of the various $e^+e^-\to 3\pi$ data sets. Overall, we obtain $a_\mu^{3\pi}|_{\leq 1.8\,\text{GeV}}=46.2(6)(6)\times 10^{-10}$ as our best estimate for the total $3\pi$ contribution consistent with all (low-energy) constraints from QCD. In combination with a recent dispersive analysis imposing the same constraints on the $2\pi$ channel below $1\,\text{GeV}$, this covers nearly $80\%$ of the total HVP contribution, leading to $a_\mu^\text{HVP}=692.3(3.3)\times 10^{-10}$ when the remainder is taken from the literature, and thus reaffirming the $(g-2)_\mu$ anomaly at the level of at least $3.4\sigma$. As side products, we find for the vacuum-polarization-subtracted masses $M_\omega=782.63(3)(1)\,\text{MeV}$ and $M_\phi=1019.20(2)(1)\,\text{MeV}$, confirming the tension to the $\omega$ mass as extracted from the $2\pi$ channel. |
1404.2025 | Norimi Yokozaki | Tsutomu T. Yanagida and Norimi Yokozaki | Upper Bounds on Gluino, Squark and Higgisino Masses in the Focus Point
Gaugino Mediation with a Mild Fine Tuning $\Delta \le 100$ | 13 pages, 2 figures | null | 10.1007/JHEP10(2014)133 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that upper bounds on the masses for gluino, squarks and higgsino are
$m_{gluino} \le 5.5$ TeV, $m_{squark} \le 4.7$ TeV and $m_{higgsino} \le 650$
GeV in a focus point gaugino mediation. Here, we impose a mild fine tuning
$\Delta \le 100$. This result shows that it is very challenging for the LHC to
exclude the focus point gaugino mediation with the mild fine tuning. However,
the ILC may have a potential for excluding the focus point gaugino mediation
with such a mild fine tuning. It is also shown that vector-like matters reduce
the required masses of the squark (stop) and gluino to explain the observed
Higgs boson mass and enhance the testability of the model at the LHC. The
fine-tuning is still kept mild.
| [
{
"created": "Tue, 8 Apr 2014 07:09:14 GMT",
"version": "v1"
}
] | 2015-06-19 | [
[
"Yanagida",
"Tsutomu T.",
""
],
[
"Yokozaki",
"Norimi",
""
]
] | We show that upper bounds on the masses for gluino, squarks and higgsino are $m_{gluino} \le 5.5$ TeV, $m_{squark} \le 4.7$ TeV and $m_{higgsino} \le 650$ GeV in a focus point gaugino mediation. Here, we impose a mild fine tuning $\Delta \le 100$. This result shows that it is very challenging for the LHC to exclude the focus point gaugino mediation with the mild fine tuning. However, the ILC may have a potential for excluding the focus point gaugino mediation with such a mild fine tuning. It is also shown that vector-like matters reduce the required masses of the squark (stop) and gluino to explain the observed Higgs boson mass and enhance the testability of the model at the LHC. The fine-tuning is still kept mild. |
1506.07530 | Fei Wang | Fei Wang, Guo-Li Liu, Kun Wu | Bounds on Higgs And Top Quark Masses From The Other Degenerate Vacua
Near The Planck Scale With Gravitational Contributions | 21 pages,15 figures | Sci. China-Phys. Mech. Astron. 61, 091011 (2018) | 10.1007/s11433-017-9179-1 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Based on the weak coupling expansion of gravity, we calculate the
gravitational contributions to yukawa coupling, scalar quartic coupling as well
as gauge couplings with general Landau-DeWitt gauge-fixing choice and a gauge
preserving (of SM gauge group) cut off regularization scheme. We find that the
results depend on the Landau-DeWitt gauge-fixing parameter. Based on the two
loop RGE of SM couplings with one loop full gravitational contributions in
harmonic gauge, we study the constraints on the higgs and top quark mass from
the requirement of existing the other degenerate vacua at the Planck-dominated
region. Our numerical calculations show that nature will not develop the other
degenerate vacua at the Planck-dominated region with current higgs and top
quark masses. On the other hand, requiring the existence of the other
degenerate vacua at the Planck-dominated region will constrain the higgs and
top mass to lie at approximately 130 and 174 GeV, respectively.
| [
{
"created": "Wed, 24 Jun 2015 20:01:10 GMT",
"version": "v1"
}
] | 2018-06-06 | [
[
"Wang",
"Fei",
""
],
[
"Liu",
"Guo-Li",
""
],
[
"Wu",
"Kun",
""
]
] | Based on the weak coupling expansion of gravity, we calculate the gravitational contributions to yukawa coupling, scalar quartic coupling as well as gauge couplings with general Landau-DeWitt gauge-fixing choice and a gauge preserving (of SM gauge group) cut off regularization scheme. We find that the results depend on the Landau-DeWitt gauge-fixing parameter. Based on the two loop RGE of SM couplings with one loop full gravitational contributions in harmonic gauge, we study the constraints on the higgs and top quark mass from the requirement of existing the other degenerate vacua at the Planck-dominated region. Our numerical calculations show that nature will not develop the other degenerate vacua at the Planck-dominated region with current higgs and top quark masses. On the other hand, requiring the existence of the other degenerate vacua at the Planck-dominated region will constrain the higgs and top mass to lie at approximately 130 and 174 GeV, respectively. |
1109.1339 | Aiichi Iwazaki | Aiichi Iwazaki | Quark Pair Production in Expanding Glasma | 8 pages, 2 figures | null | 10.1103/PhysRevC.85.034909 | Nisho-1-2012 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Glasma in high energy heavy ion collisions is longitudinal classical color
electric and magnetic fields. The color electric field has been shown to
produces quark and anti-quark pairs by the Schwinger mechanism and to oscillate
with time in non-expanding glasma, that is, plasma oscillation. On the other
hand, in the expanding glasma we show that the field decreases with the plasma
oscillation. We can explicitly obtain the solutions representing such temporal
behaviors in the system with $\tau$ and $\eta$ coordinates. We show these
results by using massless QED as a simplified model of QCD.
| [
{
"created": "Wed, 7 Sep 2011 02:21:41 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Sep 2011 02:19:23 GMT",
"version": "v2"
},
{
"created": "Sat, 14 Jan 2012 00:41:07 GMT",
"version": "v3"
}
] | 2015-05-30 | [
[
"Iwazaki",
"Aiichi",
""
]
] | Glasma in high energy heavy ion collisions is longitudinal classical color electric and magnetic fields. The color electric field has been shown to produces quark and anti-quark pairs by the Schwinger mechanism and to oscillate with time in non-expanding glasma, that is, plasma oscillation. On the other hand, in the expanding glasma we show that the field decreases with the plasma oscillation. We can explicitly obtain the solutions representing such temporal behaviors in the system with $\tau$ and $\eta$ coordinates. We show these results by using massless QED as a simplified model of QCD. |
1009.4140 | Irina Balakireva | Irina Balakireva | How accurate is the local-duality model for the pion elastic form
factor? | 7 pages, Talk given at The XIXth International Workshop High Energy
Physics and Quantum Field Theory (QFTHEP2010) 8-15 September 2010, Golitsyno,
Moscow, Russia | PoS QFTHEP2010:059,2010 | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the accuracy of the pion form factor, obtained with a local-duality
version of dispersive sum rules. To probe this accuracy, we make use of a
potential model, where the exact form factor may be calculated from the
solution of the Schroedinger equation and confronted with the local-duality
form factor. The deviation between these quantities is found to be below 20% in
the region of momentum transfers Q > 2 - 3 GeV, independently of the specific
form of the confining potential. We argue that the local-duality model for
elastic form factors in QCD has at least this level of accuracy.
| [
{
"created": "Tue, 21 Sep 2010 16:42:44 GMT",
"version": "v1"
}
] | 2010-11-30 | [
[
"Balakireva",
"Irina",
""
]
] | We study the accuracy of the pion form factor, obtained with a local-duality version of dispersive sum rules. To probe this accuracy, we make use of a potential model, where the exact form factor may be calculated from the solution of the Schroedinger equation and confronted with the local-duality form factor. The deviation between these quantities is found to be below 20% in the region of momentum transfers Q > 2 - 3 GeV, independently of the specific form of the confining potential. We argue that the local-duality model for elastic form factors in QCD has at least this level of accuracy. |
0801.1140 | Ken Intriligator | Benjamin Grinstein, Kenneth Intriligator, and Ira Z. Rothstein | Comments on Unparticles | 18 pages, 1 figure; v2: added comments on scale/conformal symmetry | Phys.Lett.B662:367-374,2008 | 10.1016/j.physletb.2008.03.020 | UCSD-PTH-08-01 | hep-ph hep-th | null | We comment on several points concerning unparticles which have been
overlooked in the literature. One regards Mack's unitarity constraint lower
bounds on CFT operator dimensions,e.g. d\geq 3 for primary, gauge invariant,
vector unparticle operators. We correct the results in the literature to
account for this, and also for a needed correction in the form of the
propagator for vector and tensor unparticles. We show that the unitarity
constraints can be directly related to unitarity requirements on scattering
amplitudes of particles, e.g. those of the standard model, coupled to the CFT
operators. We also stress the existence of explicit standard model contact
terms, which are generically induced by the coupling to the CFT (or any other
hidden sector), and are subject to LEP bounds. Barring an unknown mechanism to
tune away these contact interactions, they can swamp interference effects
generated by the CFT. We illustrate these points in the context of a weakly
coupled CFT example. A significant amount of the unparticle literature should
be reconsidered in light of the observations in this note.
| [
{
"created": "Tue, 8 Jan 2008 18:54:12 GMT",
"version": "v1"
},
{
"created": "Fri, 25 Jan 2008 17:16:44 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Grinstein",
"Benjamin",
""
],
[
"Intriligator",
"Kenneth",
""
],
[
"Rothstein",
"Ira Z.",
""
]
] | We comment on several points concerning unparticles which have been overlooked in the literature. One regards Mack's unitarity constraint lower bounds on CFT operator dimensions,e.g. d\geq 3 for primary, gauge invariant, vector unparticle operators. We correct the results in the literature to account for this, and also for a needed correction in the form of the propagator for vector and tensor unparticles. We show that the unitarity constraints can be directly related to unitarity requirements on scattering amplitudes of particles, e.g. those of the standard model, coupled to the CFT operators. We also stress the existence of explicit standard model contact terms, which are generically induced by the coupling to the CFT (or any other hidden sector), and are subject to LEP bounds. Barring an unknown mechanism to tune away these contact interactions, they can swamp interference effects generated by the CFT. We illustrate these points in the context of a weakly coupled CFT example. A significant amount of the unparticle literature should be reconsidered in light of the observations in this note. |
hep-ph/0309281 | Yuri V. Kovchegov | Yuri V. Kovchegov, Lech Szymanowski and Samuel Wallon | Perturbative Odderon in the Dipole Model | 1+16 pages, 6 figures, v2: more calculational details added | Phys.Lett. B586 (2004) 267-281 | 10.1016/j.physletb.2004.02.036 | NT@UW-03-025, INT ACK 03-51 | hep-ph | null | We show that, in the framework of Mueller's dipole model, the perturbative
QCD odderon is described by the dipole model equivalent of the BFKL equation
with a $C$-odd initial condition. The eigenfunctions and eigenvalues of the
odderon solution are the same as for the dipole BFKL equation and are given by
the functions $E^{n,\nu}$ and $\chi (n,\nu)$ correspondingly, where the $C$-odd
initial condition allows only for odd values of $n$. The leading high-energy
odderon intercept is given by $\alpha_{odd} - 1 = \frac{2 \as N_c}{\pi} \chi
(n=1 ,\nu=0) = 0$ in agreement with the solution found by Bartels, Lipatov and
Vacca. We proceed by writing down an evolution equation for the odderon
including the effects of parton saturation. We argue that saturation makes the
odderon solution a decreasing function of energy.
| [
{
"created": "Thu, 25 Sep 2003 19:18:01 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Sep 2003 19:15:45 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Kovchegov",
"Yuri V.",
""
],
[
"Szymanowski",
"Lech",
""
],
[
"Wallon",
"Samuel",
""
]
] | We show that, in the framework of Mueller's dipole model, the perturbative QCD odderon is described by the dipole model equivalent of the BFKL equation with a $C$-odd initial condition. The eigenfunctions and eigenvalues of the odderon solution are the same as for the dipole BFKL equation and are given by the functions $E^{n,\nu}$ and $\chi (n,\nu)$ correspondingly, where the $C$-odd initial condition allows only for odd values of $n$. The leading high-energy odderon intercept is given by $\alpha_{odd} - 1 = \frac{2 \as N_c}{\pi} \chi (n=1 ,\nu=0) = 0$ in agreement with the solution found by Bartels, Lipatov and Vacca. We proceed by writing down an evolution equation for the odderon including the effects of parton saturation. We argue that saturation makes the odderon solution a decreasing function of energy. |
hep-ph/9406281 | null | R. Sekhar Chivukula, Michael J. Dugan, and Mitchell Golden | The Higgs Boson Width is Adjustable | 16 pages, uses harvmac for tex and pictex (optional) for the figures.
BUHEP-94-10, HUTP-94/A014 | Phys.Lett. B336 (1994) 62-69 | 10.1016/0370-2693(94)00950-3 | null | hep-ph | null | We show that it is possible to construct models in which the width of the
Higgs boson is arbitrary - either smaller or larger than a standard model Higgs
boson of the same mass. There are no new fields into which the Higgs boson
decays. Instead, the coupling of the Higgs boson to the gauge bosons is
adjusted. We construct and analyze weakly--coupled models with arbitrary--width
Higgs bosons to investigate the phenomenology one might find in a strongly
interacting model. In any such model new physics must enter at a mass scale
which decreases as the Higgs boson width is adjusted away from its standard
model value. In particular, if the Higgs boson is wider than the standard model
Higgs boson, then interesting new physics must appear in the isospin--two
channel.
| [
{
"created": "Fri, 10 Jun 1994 15:39:33 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Chivukula",
"R. Sekhar",
""
],
[
"Dugan",
"Michael J.",
""
],
[
"Golden",
"Mitchell",
""
]
] | We show that it is possible to construct models in which the width of the Higgs boson is arbitrary - either smaller or larger than a standard model Higgs boson of the same mass. There are no new fields into which the Higgs boson decays. Instead, the coupling of the Higgs boson to the gauge bosons is adjusted. We construct and analyze weakly--coupled models with arbitrary--width Higgs bosons to investigate the phenomenology one might find in a strongly interacting model. In any such model new physics must enter at a mass scale which decreases as the Higgs boson width is adjusted away from its standard model value. In particular, if the Higgs boson is wider than the standard model Higgs boson, then interesting new physics must appear in the isospin--two channel. |
1104.0251 | Tong Li | M. Adeel Ajaib, Tong Li, Qaisar Shafi | Searching for NLSP Sbottom at the LHC | 11 pages, 5 figures and 2 tables | null | 10.1016/j.physletb.2011.05.059 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the collider phenomenology of sbottom-bino co-annihilation scenario
at both the 7 TeV and 14 TeV LHC. This co-annihilation scenario requires that
the NLSP sbottom and LSP bino masses are apart by no more than about 20% or so,
and for M_{\tilde{b}_1}>M_b+M_{\tilde{\chi}_1^0}, the sbottom decays
exclusively into b+\tilde{\chi}_1^0. We propose a search for sbottom pairs
through b\bar{b} plus missing energy. By scanning the mass parameters
M_{\tilde{b}_1} and M_{\tilde{\chi}_1^0}, we investigate the discovery limits
of sbottom and bino in the M_{\tilde{b}_1}-M_{\tilde{\chi}_1^0} plane with at
least 5\sigma significance at the LHC, for varying integrated luminosities. It
is shown that with at least 5 fb^{-1} luminosity, the 7 TeV LHC can explore a
narrow region satisfying the 20% co-annihilation condition. For the 14 TeV LHC
with 10 (100) fb^{-1} luminosity, the discovery limit of M_{\tilde{b}_1} is 360
(570) GeV.
| [
{
"created": "Fri, 1 Apr 2011 20:31:51 GMT",
"version": "v1"
}
] | 2015-05-27 | [
[
"Ajaib",
"M. Adeel",
""
],
[
"Li",
"Tong",
""
],
[
"Shafi",
"Qaisar",
""
]
] | We study the collider phenomenology of sbottom-bino co-annihilation scenario at both the 7 TeV and 14 TeV LHC. This co-annihilation scenario requires that the NLSP sbottom and LSP bino masses are apart by no more than about 20% or so, and for M_{\tilde{b}_1}>M_b+M_{\tilde{\chi}_1^0}, the sbottom decays exclusively into b+\tilde{\chi}_1^0. We propose a search for sbottom pairs through b\bar{b} plus missing energy. By scanning the mass parameters M_{\tilde{b}_1} and M_{\tilde{\chi}_1^0}, we investigate the discovery limits of sbottom and bino in the M_{\tilde{b}_1}-M_{\tilde{\chi}_1^0} plane with at least 5\sigma significance at the LHC, for varying integrated luminosities. It is shown that with at least 5 fb^{-1} luminosity, the 7 TeV LHC can explore a narrow region satisfying the 20% co-annihilation condition. For the 14 TeV LHC with 10 (100) fb^{-1} luminosity, the discovery limit of M_{\tilde{b}_1} is 360 (570) GeV. |
0807.2674 | Sean Fleming | Sean Fleming, Thomas Mehen | Hadronic Decays of the X(3872) to chi_{cJ} in Effective Field Theory | 13 Pages, 3 Figures. We recalculate the decay to chi_{c1} + pi^0 +
pi^0 including the D^{*0} width and find a branching fraction relative to the
decay to chi_{c1} + pi^0 that is 0.6 | Phys.Rev.D78:094019,2008 | 10.1103/PhysRevD.78.094019 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The decays of the X(3872) to P-wave quarkonia are calculated under the
assumption that it is a shallow bound state of neutral charmed mesons. The
X(3872) is described using an effective theory of nonrelativistic D mesons and
pions (X-EFT). We calculate X(3872) decays by first matching heavy hadron
chiral perturbation theory (HHchiPT) amplitudes for D^0 bar{D}^{*0} -> chi_{cJ}
+ (pi^0,pi+pi) onto local operators in X-EFT, and then using these operators to
calculate the X(3872) decays. This procedure reproduces the factorization
theorems for X(3872) decays to conventional quarkonia previously derived using
the operator product expansion. For single pion decays, we find nontrivial
dependence on the pion energy from HHchiPT diagrams with virtual D mesons. This
nontrivial energy dependence can potentially modify heavy quark symmetry
predictions for the relative sizes of decay rates. At leading order, decays to
final states with two pions are dominated by the final state chi_{c1} + pi^0 +
pi^0, with a branching fraction just below that for the decay to chi_{c1} +
pi^0. Decays to all other final states with two pions are highly suppressed.
| [
{
"created": "Wed, 16 Jul 2008 23:21:37 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Sep 2008 22:13:38 GMT",
"version": "v2"
}
] | 2009-02-23 | [
[
"Fleming",
"Sean",
""
],
[
"Mehen",
"Thomas",
""
]
] | The decays of the X(3872) to P-wave quarkonia are calculated under the assumption that it is a shallow bound state of neutral charmed mesons. The X(3872) is described using an effective theory of nonrelativistic D mesons and pions (X-EFT). We calculate X(3872) decays by first matching heavy hadron chiral perturbation theory (HHchiPT) amplitudes for D^0 bar{D}^{*0} -> chi_{cJ} + (pi^0,pi+pi) onto local operators in X-EFT, and then using these operators to calculate the X(3872) decays. This procedure reproduces the factorization theorems for X(3872) decays to conventional quarkonia previously derived using the operator product expansion. For single pion decays, we find nontrivial dependence on the pion energy from HHchiPT diagrams with virtual D mesons. This nontrivial energy dependence can potentially modify heavy quark symmetry predictions for the relative sizes of decay rates. At leading order, decays to final states with two pions are dominated by the final state chi_{c1} + pi^0 + pi^0, with a branching fraction just below that for the decay to chi_{c1} + pi^0. Decays to all other final states with two pions are highly suppressed. |
hep-ph/9612228 | Stefan Scherer | S. Scherer (Institut f. Kernphysik, Mainz) | Chiral dynamics of rare eta decays and virtual Compton scattering off
the nucleon | 5 pages, 3 postscript figures, Revtex using epsf, invited talk given
at the workshop DAPHCE96, Frascati, November 1996, to appear in the
proceedings (Nucl. Phys. A) | Nucl.Phys. A623 (1997) 215c-219c | 10.1016/S0375-9474(97)00440-5 | MKPH-T-96-30 | hep-ph nucl-th | null | Two different topics relevant for DA$\Phi$NE and CEBAF, respectively, are
covered. First we analyze the rare radiative eta decay mode
$\eta\to\pi\pi\gamma\gamma$ within the framework of chiral perturbation theory
at ${\cal O}(p^4)$. We then discuss virtual Compton scattering off the nucleon
at low energies. Predictions for the two spin-independent generalized
polarizabilities are shown.
| [
{
"created": "Mon, 2 Dec 1996 14:05:19 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Scherer",
"S.",
"",
"Institut f. Kernphysik, Mainz"
]
] | Two different topics relevant for DA$\Phi$NE and CEBAF, respectively, are covered. First we analyze the rare radiative eta decay mode $\eta\to\pi\pi\gamma\gamma$ within the framework of chiral perturbation theory at ${\cal O}(p^4)$. We then discuss virtual Compton scattering off the nucleon at low energies. Predictions for the two spin-independent generalized polarizabilities are shown. |
1409.4590 | Xiaojun Bi | Xiao-Jun Bi, Peng-Fei Yin, Qiang Yuan | Status of Dark Matter Detection | 33 pages, invited review | Front.Phys.China 8 (2013) 794-827 | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The detection of dark matter has made great progresses in recent years. We
give a brief review on the status and progress in dark matter detection,
including the progresses in direct detection, collider detection at LHC and
focus on the indirect detection. The results from PAMELA, ATIC, Fermi-LAT and
relevant studies on these results are introduced. Then we give the progress on
indirect detection of gamma rays from Fermi-LAT and ground based Cerenkov
telescopes. Finally the detection of neutrinos and constraints on the nature of
dark matter are reviewed briefly.
| [
{
"created": "Tue, 16 Sep 2014 11:37:06 GMT",
"version": "v1"
}
] | 2014-09-17 | [
[
"Bi",
"Xiao-Jun",
""
],
[
"Yin",
"Peng-Fei",
""
],
[
"Yuan",
"Qiang",
""
]
] | The detection of dark matter has made great progresses in recent years. We give a brief review on the status and progress in dark matter detection, including the progresses in direct detection, collider detection at LHC and focus on the indirect detection. The results from PAMELA, ATIC, Fermi-LAT and relevant studies on these results are introduced. Then we give the progress on indirect detection of gamma rays from Fermi-LAT and ground based Cerenkov telescopes. Finally the detection of neutrinos and constraints on the nature of dark matter are reviewed briefly. |
2210.01589 | Da-Xin Zhang | Qian Wan, Da-Xin Zhang | An extended study on the supersymmetric SO(10) models with natural
doublet-triplet splitting | 9 pages | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | In the supersymmetric SO(10) models, the doublet-triplet splitting problem
can be solved through the Dimopoulos-Wilczek mechanism. This mechanism is
extended in the non-renormalizable version. Improvement on the realistic model
is also made.
| [
{
"created": "Tue, 4 Oct 2022 13:12:03 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Feb 2023 03:50:03 GMT",
"version": "v2"
},
{
"created": "Tue, 25 Apr 2023 12:45:45 GMT",
"version": "v3"
}
] | 2023-04-26 | [
[
"Wan",
"Qian",
""
],
[
"Zhang",
"Da-Xin",
""
]
] | In the supersymmetric SO(10) models, the doublet-triplet splitting problem can be solved through the Dimopoulos-Wilczek mechanism. This mechanism is extended in the non-renormalizable version. Improvement on the realistic model is also made. |
1901.10346 | I. V. Danilkin | Igor Danilkin, Christoph Florian Redmer, Marc Vanderhaeghen | The hadronic light-by-light contribution to the muon's anomalous
magnetic moment | 87 pages, 33 figures, Prog. Part. Nucl. Phys. (in Press) | null | 10.1016/j.ppnp.2019.05.002 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In view of the current 3 - 4 $\sigma$ deviation between theoretical and
experimental values for the muon's anomalous magnetic moment, we review the
ongoing efforts in constraining the hadronic light-by-light contribution to
$a_\mu$ by using dispersive techniques combined with a dedicated experimental
program to obtain the required hadronic input.
| [
{
"created": "Tue, 29 Jan 2019 15:48:49 GMT",
"version": "v1"
},
{
"created": "Mon, 27 May 2019 14:27:00 GMT",
"version": "v2"
}
] | 2019-06-26 | [
[
"Danilkin",
"Igor",
""
],
[
"Redmer",
"Christoph Florian",
""
],
[
"Vanderhaeghen",
"Marc",
""
]
] | In view of the current 3 - 4 $\sigma$ deviation between theoretical and experimental values for the muon's anomalous magnetic moment, we review the ongoing efforts in constraining the hadronic light-by-light contribution to $a_\mu$ by using dispersive techniques combined with a dedicated experimental program to obtain the required hadronic input. |
2112.05103 | Luis Flores | L. J. Flores, Newton Nath, Eduardo Peinado | CE$\nu$NS as a probe of flavored generalized neutrino interactions | Now published in Physical Review D | Phys.Rev.D 105 (2022) 5, 055010 | 10.1103/PhysRevD.105.055010 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine the potential to probe generalized neutrino interactions (GNI),
exotic effective couplings due to new physics interactions beyond the Standard
Model, in the coherent-elastic neutrino-nucleus scattering experiments in light
of the latest COHERENT-CsI, and -LAr data. Our analysis focuses on scalar,
vector and tensor flavored-GNI parameters. A combined analysis has been made to
constrain these exotic couplings for the CsI and LAr detector. We further add
the projected forthcoming reactor-based Scintillating Bubble Chamber detector
to examine these couplings. It has been observed that the addition of reactor
data strongly constrained electron flavor GNI.
| [
{
"created": "Thu, 9 Dec 2021 18:41:50 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Mar 2022 15:52:47 GMT",
"version": "v2"
}
] | 2022-03-16 | [
[
"Flores",
"L. J.",
""
],
[
"Nath",
"Newton",
""
],
[
"Peinado",
"Eduardo",
""
]
] | We examine the potential to probe generalized neutrino interactions (GNI), exotic effective couplings due to new physics interactions beyond the Standard Model, in the coherent-elastic neutrino-nucleus scattering experiments in light of the latest COHERENT-CsI, and -LAr data. Our analysis focuses on scalar, vector and tensor flavored-GNI parameters. A combined analysis has been made to constrain these exotic couplings for the CsI and LAr detector. We further add the projected forthcoming reactor-based Scintillating Bubble Chamber detector to examine these couplings. It has been observed that the addition of reactor data strongly constrained electron flavor GNI. |
2107.06748 | Wenliang Li | C. Ayerbe Gayoso, {\L}. Bibrzycki, S. Diehl, S. Heppelmann, D.W.
Higinbotham, G.M. Huber, S.J.D. Kay, S.R. Klein, J.M. Laget, W.B. Li, V.
Mathieu, K. Park, R.J. Perry, B. Pire, K. Semenov-Tian-Shansky, A. Stanek,
J.R. Stevens, L. Szymanowski, C. Weiss, B.-G. Yu | Progress and Opportunities in Backward angle (u-channel) Physics | null | Eur. Phys. J. A (2021) 57 :342 | 10.1140/epja/s10050-021-00625-2 | null | hep-ph nucl-ex nucl-th | http://creativecommons.org/licenses/by/4.0/ | Backward angle (u-channel) scattering provides complementary information for
studies of hadron spectroscopy and structure, but has been less comprehensively
studied than the corresponding forward angle case. As a result, the physics of
u-channel scattering poses a range of new experimental and theoretical
opportunities and questions. We summarize recent progress in measuring and
understanding high energy reactions with baryon charge exchange in the
u-channel, as discussed in the first backward angle (u-channel) Physics
Workshop. In particular, we discuss backward angle measurements and their
theoretical description via both hadronic models and the collinear
factorization approach, and discuss planned future measurements of u-channel
physics. Finally, we propose outstanding questions and challenges for u-channel
physics.
| [
{
"created": "Wed, 14 Jul 2021 14:47:42 GMT",
"version": "v1"
},
{
"created": "Thu, 15 Jul 2021 12:51:23 GMT",
"version": "v2"
},
{
"created": "Fri, 30 Jul 2021 15:09:13 GMT",
"version": "v3"
},
{
"created": "Sun, 7 Nov 2021 19:46:24 GMT",
"version": "v4"
},
{
"created": "Wed, 9 Feb 2022 15:15:49 GMT",
"version": "v5"
}
] | 2022-02-10 | [
[
"Gayoso",
"C. Ayerbe",
""
],
[
"Bibrzycki",
"Ł.",
""
],
[
"Diehl",
"S.",
""
],
[
"Heppelmann",
"S.",
""
],
[
"Higinbotham",
"D. W.",
""
],
[
"Huber",
"G. M.",
""
],
[
"Kay",
"S. J. D.",
""
],
[
"Klein",
"S. R.",
""
],
[
"Laget",
"J. M.",
""
],
[
"Li",
"W. B.",
""
],
[
"Mathieu",
"V.",
""
],
[
"Park",
"K.",
""
],
[
"Perry",
"R. J.",
""
],
[
"Pire",
"B.",
""
],
[
"Semenov-Tian-Shansky",
"K.",
""
],
[
"Stanek",
"A.",
""
],
[
"Stevens",
"J. R.",
""
],
[
"Szymanowski",
"L.",
""
],
[
"Weiss",
"C.",
""
],
[
"Yu",
"B. -G.",
""
]
] | Backward angle (u-channel) scattering provides complementary information for studies of hadron spectroscopy and structure, but has been less comprehensively studied than the corresponding forward angle case. As a result, the physics of u-channel scattering poses a range of new experimental and theoretical opportunities and questions. We summarize recent progress in measuring and understanding high energy reactions with baryon charge exchange in the u-channel, as discussed in the first backward angle (u-channel) Physics Workshop. In particular, we discuss backward angle measurements and their theoretical description via both hadronic models and the collinear factorization approach, and discuss planned future measurements of u-channel physics. Finally, we propose outstanding questions and challenges for u-channel physics. |
1605.03437 | Eef van Beveren | Eef van Beveren, George Rupp and Susana Coito | Modeling two-boson mass distributions, E(38 MeV) and Z(57.5 GeV) | 6 pages, plain LaTeX. arXiv admin note: text overlap with
arXiv:1502.04862 | Acta Phys. Polon. B Proc. Supp. 9 (2016) 583 | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Besides general features of two-boson mass distributions, experimental
results are are discussed. Furthermore, E(38 MeV) and Z(57.5 GeV) are
highlighted.
| [
{
"created": "Wed, 11 May 2016 13:38:41 GMT",
"version": "v1"
}
] | 2017-12-19 | [
[
"van Beveren",
"Eef",
""
],
[
"Rupp",
"George",
""
],
[
"Coito",
"Susana",
""
]
] | Besides general features of two-boson mass distributions, experimental results are are discussed. Furthermore, E(38 MeV) and Z(57.5 GeV) are highlighted. |
hep-ph/0111028 | Vysotsky | V.A. Novikov, L.B. Okun, A.N. Rozanov, M.I. Vysotsky | Extra generations and discrepancies of electroweak precision data | 10 pages, TeX. An additional reference and P.P.S. about heavy higgs
are added | Phys.Lett. B529 (2002) 111-116 | 10.1016/S0370-2693(02)01240-6 | null | hep-ph | null | It is shown that additional chiral generations are not excluded by the latest
electroweak precision data if one assumes that there is no mixing with the
known three generations. In the case of ``heavy extra generations'', when all
four new particles are heavier than $Z$ boson, quality of the fit for the one
new generation is as good as for zero new generations (Standard Model). In the
case of neutral leptons with masses around 50 GeV (``partially heavy extra
generations'') the minimum of $\chi^2$ is between one and two extra
generations.
| [
{
"created": "Fri, 2 Nov 2001 14:59:20 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Dec 2001 14:27:18 GMT",
"version": "v2"
},
{
"created": "Sun, 27 Jan 2002 14:23:47 GMT",
"version": "v3"
}
] | 2009-11-07 | [
[
"Novikov",
"V. A.",
""
],
[
"Okun",
"L. B.",
""
],
[
"Rozanov",
"A. N.",
""
],
[
"Vysotsky",
"M. I.",
""
]
] | It is shown that additional chiral generations are not excluded by the latest electroweak precision data if one assumes that there is no mixing with the known three generations. In the case of ``heavy extra generations'', when all four new particles are heavier than $Z$ boson, quality of the fit for the one new generation is as good as for zero new generations (Standard Model). In the case of neutral leptons with masses around 50 GeV (``partially heavy extra generations'') the minimum of $\chi^2$ is between one and two extra generations. |
0908.2998 | Timothy Cohen | Timothy Cohen, Daniel J. Phalen and Aaron Pierce | Supersymmetric Baryogenesis from Exotic Quark Decays | 28 pages, 7 figures, 2 appendices, v2: typos corrected, results
unchanged | Phys.Rev.D81:035020,2010 | 10.1103/PhysRevD.81.035020 | MCTP-09-41 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a simple extension of the minimal supersymmetric standard model,
out-of-equilibrium decays of TeV scale exotic vector-like squarks may generate
the baryon asymmetry of the universe. Baryon number and CP violation are
present in the superpotential, so this mechanism does not rely on CP violation
in supersymmetry breaking parameters. We discuss phenomenological constraints
on the model as well as potential signals for the Large Hadron Collider and
electronic dipole moment experiments. A variation on the TeV scale model allows
the exotic squarks to be the messengers of gauge mediated supersymmetry
breaking.
| [
{
"created": "Thu, 20 Aug 2009 20:12:11 GMT",
"version": "v1"
},
{
"created": "Fri, 23 Oct 2009 19:53:29 GMT",
"version": "v2"
},
{
"created": "Fri, 23 Oct 2009 20:00:24 GMT",
"version": "v3"
}
] | 2014-11-20 | [
[
"Cohen",
"Timothy",
""
],
[
"Phalen",
"Daniel J.",
""
],
[
"Pierce",
"Aaron",
""
]
] | In a simple extension of the minimal supersymmetric standard model, out-of-equilibrium decays of TeV scale exotic vector-like squarks may generate the baryon asymmetry of the universe. Baryon number and CP violation are present in the superpotential, so this mechanism does not rely on CP violation in supersymmetry breaking parameters. We discuss phenomenological constraints on the model as well as potential signals for the Large Hadron Collider and electronic dipole moment experiments. A variation on the TeV scale model allows the exotic squarks to be the messengers of gauge mediated supersymmetry breaking. |
0709.0678 | Luis Anchordoqui | Luis Anchordoqui and Haim Goldberg | Constraints on Unparticle Physics from Solar and KamLAND Neutrinos | To be published in Phys. Lett. B | Phys.Lett.B659:345-348,2008 | 10.1016/j.physletb.2007.11.077 | null | hep-ph | null | Interest has been directed recently towards low energy implications of a
non-trivial conformal sector of an effective field theory with an IR fixed
point (\Lambda), manifest in terms of ``unparticles'' with bizarre properties.
We re-examine the implications of the limits on decay lifetimes of solar
neutrinos for unparticle interactions. We study in detail the fundamental
parameter space (\Lambda, M) and derive bounds on the energy scale M
characterizing the new physics. We work strictly within the framework where
conformal invariance holds down to low energies. We first assume that couplings
of the unparticle sector to the Higgs field are suppressed and derive bounds
with \Lambda in the TeV region from neutrino decay into scalar unparticles.
These bounds are significant for values of the anomalous dimension of the
unparticle operator 1.0 < d < 1.2. For a region of the parameter space, we show
that the bounds are comparable to those arising from production rates at high
energy colliders. We then relax our assumption, by considering a more natural
framework which does not require a priori restrictions on couplings of
Higgs-unparticle operators, and derive bounds with \Lambda in meV region from
neutrino decay into vector unparticles. Such low scales for the IR fixed point
are relevant in gauge theories with many flavors.
| [
{
"created": "Wed, 5 Sep 2007 17:42:18 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Nov 2007 19:22:20 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Anchordoqui",
"Luis",
""
],
[
"Goldberg",
"Haim",
""
]
] | Interest has been directed recently towards low energy implications of a non-trivial conformal sector of an effective field theory with an IR fixed point (\Lambda), manifest in terms of ``unparticles'' with bizarre properties. We re-examine the implications of the limits on decay lifetimes of solar neutrinos for unparticle interactions. We study in detail the fundamental parameter space (\Lambda, M) and derive bounds on the energy scale M characterizing the new physics. We work strictly within the framework where conformal invariance holds down to low energies. We first assume that couplings of the unparticle sector to the Higgs field are suppressed and derive bounds with \Lambda in the TeV region from neutrino decay into scalar unparticles. These bounds are significant for values of the anomalous dimension of the unparticle operator 1.0 < d < 1.2. For a region of the parameter space, we show that the bounds are comparable to those arising from production rates at high energy colliders. We then relax our assumption, by considering a more natural framework which does not require a priori restrictions on couplings of Higgs-unparticle operators, and derive bounds with \Lambda in meV region from neutrino decay into vector unparticles. Such low scales for the IR fixed point are relevant in gauge theories with many flavors. |
hep-ph/0007156 | Greg Mahlon | Gregory Mahlon (McGill University) | From Crepes to Pancakes in the MV Model | 6 pages with 4 figures (aipproc) | AIP Conf.Proc. 549 (2002) 388-392 | 10.1063/1.1345280 | McGill/00-21 | hep-ph nucl-th | null | The McLerran-Venugopalan model provides a framework which allows one to
compute the gluon distribution function of a very large nucleus from the
equations of QCD, provided that the longitudinal momentum fraction, xF, is
sufficiently small. The source of color charge for this computation may be
thought of as a crepe moving along the z axis at the speed of light. We refine
the MV model by allowing for the presence of non-trivial longitudinal
correlations between the color charges that comprise the nucleons. We find that
a consistent treatment forces us to consider a pancake-like source which moves
at slightly less than the speed of light. Our calculation allows us to consider
larger values of xF than were allowed in the original MV model.
| [
{
"created": "Fri, 14 Jul 2000 15:47:58 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Mahlon",
"Gregory",
"",
"McGill University"
]
] | The McLerran-Venugopalan model provides a framework which allows one to compute the gluon distribution function of a very large nucleus from the equations of QCD, provided that the longitudinal momentum fraction, xF, is sufficiently small. The source of color charge for this computation may be thought of as a crepe moving along the z axis at the speed of light. We refine the MV model by allowing for the presence of non-trivial longitudinal correlations between the color charges that comprise the nucleons. We find that a consistent treatment forces us to consider a pancake-like source which moves at slightly less than the speed of light. Our calculation allows us to consider larger values of xF than were allowed in the original MV model. |
hep-ph/0106184 | Zuo-tang Liang | Chun-xiu Liu, Qing-hua Xu and Zuo-tang Liang (Shandong U.) | Hyperon polarization in semi-inclusive deeply inelastic lepton-nucleon
scattering at high energy | 30 pages, 13 figures | Phys.Rev. D64 (2001) 073004 | 10.1103/PhysRevD.64.073004 | null | hep-ph | null | We calculate the polarizations for different octet hyperons produced in the
current fragmentation regions of the deeply inelastic lepton-nucleon
scatterings $\mu^-N \to \mu^- HX$ and $\nu_{\mu} N \to \mu^- HX$ at high energy
using different models for spin transfer in fragmentation processes. The
results show that measurements of those hyperon polarizations should provide
useful information to distinguish between different models in particular the
SU(6) and the DIS pictures used frequently in the literature. We found, in
particular, that measuring the polarization of $\Sigma^+$ produced in these
processes can give a better test to the validity of the different spin transfer
models.
| [
{
"created": "Sat, 16 Jun 2001 20:55:18 GMT",
"version": "v1"
}
] | 2019-05-15 | [
[
"Liu",
"Chun-xiu",
"",
"Shandong U."
],
[
"Xu",
"Qing-hua",
"",
"Shandong U."
],
[
"Liang",
"Zuo-tang",
"",
"Shandong U."
]
] | We calculate the polarizations for different octet hyperons produced in the current fragmentation regions of the deeply inelastic lepton-nucleon scatterings $\mu^-N \to \mu^- HX$ and $\nu_{\mu} N \to \mu^- HX$ at high energy using different models for spin transfer in fragmentation processes. The results show that measurements of those hyperon polarizations should provide useful information to distinguish between different models in particular the SU(6) and the DIS pictures used frequently in the literature. We found, in particular, that measuring the polarization of $\Sigma^+$ produced in these processes can give a better test to the validity of the different spin transfer models. |
0810.0316 | Wei-Ning Zhang | Yan-Yu Ren, Wei-Ning Zhang, Jian-Li Liu | Detection of source inhomogeneity through event-by-event two-pion
Bose-Einstein correlations | 10 pages, 6 figures | Phys.Lett.B669:317-320,2008 | 10.1016/j.physletb.2008.10.005 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We develop a method for detecting the inhomogeneity of the pion-emitting
sources produced in ultra-relativistic heavy ion collisions, through
event-by-event two-pion Bose-Einstein correlations. The root-mean-square of the
error-inverse-weighted fluctuations between the two-pion correlation functions
of single and mixed events are useful observables for the detection. By
investigating the root-mean-square of the weighted fluctuations for different
impact parameter regions people may hopefully determine the inhomogeneity of
the particle-emitting in the coming Large Hadron Collider (LHC) heavy ion
experiments.
| [
{
"created": "Thu, 2 Oct 2008 00:06:26 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Ren",
"Yan-Yu",
""
],
[
"Zhang",
"Wei-Ning",
""
],
[
"Liu",
"Jian-Li",
""
]
] | We develop a method for detecting the inhomogeneity of the pion-emitting sources produced in ultra-relativistic heavy ion collisions, through event-by-event two-pion Bose-Einstein correlations. The root-mean-square of the error-inverse-weighted fluctuations between the two-pion correlation functions of single and mixed events are useful observables for the detection. By investigating the root-mean-square of the weighted fluctuations for different impact parameter regions people may hopefully determine the inhomogeneity of the particle-emitting in the coming Large Hadron Collider (LHC) heavy ion experiments. |
hep-ph/0504134 | Vincenzo Cirigliano | Nicole F. Bell, Vincenzo Cirigliano, Michael J. Ramsey-Musolf, Petr
Vogel, Mark B. Wise | How Magnetic is the Dirac Neutrino? | 4 pages, 3 figures, Majorana case discussion corrected. References
updated; replaced to match published version | Phys.Rev.Lett. 95 (2005) 151802 | 10.1103/PhysRevLett.95.151802 | CALT-08-2554, KRL-MAP-307 | hep-ph | null | We derive model-independent, "naturalness" upper bounds on the magnetic
moments \mu_\nu of Dirac neutrinos generated by physics above the scale of
electroweak symmetry breaking. In the absence of fine-tuning of effective
operator coefficients, we find that current information on neutrino mass
implies that |\mu_\nu | < 10^(-14) Bohr magnetons. This bound is several orders
of magnitude stronger than those obtained from analyses of solar and reactor
neutrino data and astrophysical observations.
| [
{
"created": "Fri, 15 Apr 2005 22:01:43 GMT",
"version": "v1"
},
{
"created": "Sat, 23 Apr 2005 01:16:36 GMT",
"version": "v2"
},
{
"created": "Mon, 9 May 2005 21:01:33 GMT",
"version": "v3"
},
{
"created": "Fri, 16 Dec 2005 19:44:45 GMT",
"version": "v4"
}
] | 2009-11-11 | [
[
"Bell",
"Nicole F.",
""
],
[
"Cirigliano",
"Vincenzo",
""
],
[
"Ramsey-Musolf",
"Michael J.",
""
],
[
"Vogel",
"Petr",
""
],
[
"Wise",
"Mark B.",
""
]
] | We derive model-independent, "naturalness" upper bounds on the magnetic moments \mu_\nu of Dirac neutrinos generated by physics above the scale of electroweak symmetry breaking. In the absence of fine-tuning of effective operator coefficients, we find that current information on neutrino mass implies that |\mu_\nu | < 10^(-14) Bohr magnetons. This bound is several orders of magnitude stronger than those obtained from analyses of solar and reactor neutrino data and astrophysical observations. |
1909.06808 | Jian Wang | Long-Bin Chen, Hai Tao Li, Hua-Sheng Shao, Jian Wang | Higgs boson pair production via gluon fusion at N$^3$LO in QCD | 8 pages, 5 figures, published version in PLB | Physics Letters B 803 (2020) 135292 | 10.1016/j.physletb.2020.135292 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present next-to-next-to-next-to-leading order (N$^3$LO) QCD predictions
for the Higgs boson pair production via gluon fusion at hadron colliders in the
infinite top-quark mass limit. Besides the inclusive total cross sections at
various collision energies, we also provide the invariant mass distribution of
the Higgs boson pair. Our results show that the N$^3$LO QCD corrections enhance
the next-to-next-to-leading order cross section by $3.0\%$ ($2.7\%$) at
$\sqrt{s}=13~(100)$ TeV, while the scale uncertainty is reduced substantially
below $3\%$ ($2\%$). We also find that a judicious scale choice can
significantly improve the perturbative convergence. For the invariant mass
distribution, our calculation demonstrates that the N$^3$LO corrections improve
the scale dependence but almost do not change the shape.
| [
{
"created": "Sun, 15 Sep 2019 14:14:33 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Mar 2020 01:29:36 GMT",
"version": "v2"
}
] | 2020-03-03 | [
[
"Chen",
"Long-Bin",
""
],
[
"Li",
"Hai Tao",
""
],
[
"Shao",
"Hua-Sheng",
""
],
[
"Wang",
"Jian",
""
]
] | We present next-to-next-to-next-to-leading order (N$^3$LO) QCD predictions for the Higgs boson pair production via gluon fusion at hadron colliders in the infinite top-quark mass limit. Besides the inclusive total cross sections at various collision energies, we also provide the invariant mass distribution of the Higgs boson pair. Our results show that the N$^3$LO QCD corrections enhance the next-to-next-to-leading order cross section by $3.0\%$ ($2.7\%$) at $\sqrt{s}=13~(100)$ TeV, while the scale uncertainty is reduced substantially below $3\%$ ($2\%$). We also find that a judicious scale choice can significantly improve the perturbative convergence. For the invariant mass distribution, our calculation demonstrates that the N$^3$LO corrections improve the scale dependence but almost do not change the shape. |
hep-ph/9411376 | null | M. A. Braun | On the Nikolaev-Zakharov-Zoller form for the BFKL pomeron | 8 pages, LaTeX, no figures | Z.Phys. C70 (1996) 103-106 | null | US-FT/19-94 | hep-ph | null | The equation proposed by N.N.Nikolaev, B.G.Zakharov and V.R.Zoller for the
colour dipole cross-section is compared with the BFKL equation for the hard
pomeron for the $SU(2)$ colour group. It is demonstrated that for a fixed
coupling constant the difference between the two equations is due to a
different manner to introduce the gluon mass.
| [
{
"created": "Wed, 23 Nov 1994 08:56:09 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Braun",
"M. A.",
""
]
] | The equation proposed by N.N.Nikolaev, B.G.Zakharov and V.R.Zoller for the colour dipole cross-section is compared with the BFKL equation for the hard pomeron for the $SU(2)$ colour group. It is demonstrated that for a fixed coupling constant the difference between the two equations is due to a different manner to introduce the gluon mass. |
1705.07920 | Jonathan Cornell | Torsten Bringmann, Jan Conrad, Jonathan M. Cornell, Lars A. Dal,
Joakim Edsj\"o, Ben Farmer, Felix Kahlhoefer, Anders Kvellestad, Antje Putze,
Christopher Savage, Pat Scott, Christoph Weniger, Martin White and Sebastian
Wild (The GAMBIT Dark Matter Workgroup) | DarkBit: A GAMBIT module for computing dark matter observables and
likelihoods | 53 pages, 9 figures, 25 tables. v2: Updated to reflect new
functionality in version 1.1.0, including the addition of Xenon1T and PICO-60
likelihoods. Minor corrections and clarifications throughout. Matches
published version | Eur.Phys.J. C77 (2017) no.12, 831 | 10.1140/epjc/s10052-017-5155-4 | DESY-17-235, NORDITA-2017-076, gambit-code-2017 | hep-ph astro-ph.CO astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce DarkBit, an advanced software code for computing dark matter
constraints on various extensions to the Standard Model of particle physics,
comprising both new native code and interfaces to external packages. This
release includes a dedicated signal yield calculator for gamma-ray
observations, which significantly extends current tools by implementing a
cascade decay Monte Carlo, as well as a dedicated likelihood calculator for
current and future experiments (gamlike). This provides a general solution for
studying complex particle physics models that predict dark matter annihilation
to a multitude of final states. We also supply a direct detection package that
models a large range of direct detection experiments (DDcalc), and provides the
corresponding likelihoods for arbitrary combinations of spin-independent and
spin-dependent scattering processes. Finally, we provide custom relic density
routines along with interfaces to DarkSUSY, micrOMEGAs, and the neutrino
telescope likelihood package nuLike. DarkBit is written in the framework of the
Global And Modular Beyond the Standard Model Inference Tool (GAMBIT), providing
seamless integration into a comprehensive statistical fitting framework that
allows users to explore new models with both particle and astrophysics
constraints, and a consistent treatment of systematic uncertainties. In this
paper we describe its main functionality, provide a guide to getting started
quickly, and show illustrative examples for results obtained with DarkBit (both
as a standalone tool and as a GAMBIT module). This includes a quantitative
comparison between two of the main dark matter codes (DarkSUSY and micrOMEGAs),
and application of DarkBit's advanced direct and indirect detection routines to
a simple effective dark matter model.
| [
{
"created": "Mon, 22 May 2017 18:02:23 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Jan 2018 01:06:03 GMT",
"version": "v2"
}
] | 2020-08-19 | [
[
"Bringmann",
"Torsten",
"",
"The GAMBIT Dark Matter Workgroup"
],
[
"Conrad",
"Jan",
"",
"The GAMBIT Dark Matter Workgroup"
],
[
"Cornell",
"Jonathan M.",
"",
"The GAMBIT Dark Matter Workgroup"
],
[
"Dal",
"Lars A.",
"",
"The GAMBIT Dark Matter Workgroup"
],
[
"Edsjö",
"Joakim",
"",
"The GAMBIT Dark Matter Workgroup"
],
[
"Farmer",
"Ben",
"",
"The GAMBIT Dark Matter Workgroup"
],
[
"Kahlhoefer",
"Felix",
"",
"The GAMBIT Dark Matter Workgroup"
],
[
"Kvellestad",
"Anders",
"",
"The GAMBIT Dark Matter Workgroup"
],
[
"Putze",
"Antje",
"",
"The GAMBIT Dark Matter Workgroup"
],
[
"Savage",
"Christopher",
"",
"The GAMBIT Dark Matter Workgroup"
],
[
"Scott",
"Pat",
"",
"The GAMBIT Dark Matter Workgroup"
],
[
"Weniger",
"Christoph",
"",
"The GAMBIT Dark Matter Workgroup"
],
[
"White",
"Martin",
"",
"The GAMBIT Dark Matter Workgroup"
],
[
"Wild",
"Sebastian",
"",
"The GAMBIT Dark Matter Workgroup"
]
] | We introduce DarkBit, an advanced software code for computing dark matter constraints on various extensions to the Standard Model of particle physics, comprising both new native code and interfaces to external packages. This release includes a dedicated signal yield calculator for gamma-ray observations, which significantly extends current tools by implementing a cascade decay Monte Carlo, as well as a dedicated likelihood calculator for current and future experiments (gamlike). This provides a general solution for studying complex particle physics models that predict dark matter annihilation to a multitude of final states. We also supply a direct detection package that models a large range of direct detection experiments (DDcalc), and provides the corresponding likelihoods for arbitrary combinations of spin-independent and spin-dependent scattering processes. Finally, we provide custom relic density routines along with interfaces to DarkSUSY, micrOMEGAs, and the neutrino telescope likelihood package nuLike. DarkBit is written in the framework of the Global And Modular Beyond the Standard Model Inference Tool (GAMBIT), providing seamless integration into a comprehensive statistical fitting framework that allows users to explore new models with both particle and astrophysics constraints, and a consistent treatment of systematic uncertainties. In this paper we describe its main functionality, provide a guide to getting started quickly, and show illustrative examples for results obtained with DarkBit (both as a standalone tool and as a GAMBIT module). This includes a quantitative comparison between two of the main dark matter codes (DarkSUSY and micrOMEGAs), and application of DarkBit's advanced direct and indirect detection routines to a simple effective dark matter model. |
1510.04830 | Darius Jurciukonis | Darius Jurciukonis, Thomas Gajdosik and Andrius Juodagalvis | A minimal seesaw model with mu-tau symmetry | Submitted to the proceedings of EPS-HEP 2015 conference, 22-29 July,
Vienna, Austria | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyse a flavour model for a lepton sector which is based on type I
seesaw mechanism, a Z_2 symmetry for lepton flavours, a mu-tau interchange
symmetry and a CP symmetry. This model fits well the data of neutrino mass
squared differences and oscillation angles. The model predicts an overall
neutrino mass scale for normal and inverted neutrino mass hierarchy and the
effective mass m_beta, which is used in the neutrinoless double beta decay.
| [
{
"created": "Fri, 16 Oct 2015 10:37:29 GMT",
"version": "v1"
}
] | 2015-10-19 | [
[
"Jurciukonis",
"Darius",
""
],
[
"Gajdosik",
"Thomas",
""
],
[
"Juodagalvis",
"Andrius",
""
]
] | We analyse a flavour model for a lepton sector which is based on type I seesaw mechanism, a Z_2 symmetry for lepton flavours, a mu-tau interchange symmetry and a CP symmetry. This model fits well the data of neutrino mass squared differences and oscillation angles. The model predicts an overall neutrino mass scale for normal and inverted neutrino mass hierarchy and the effective mass m_beta, which is used in the neutrinoless double beta decay. |
hep-ph/0304027 | Robert Fleischer | Robert Fleischer (CERN) | New Strategies to Obtain Insights into CP Violation Through $B_s\to
D_s^{\pm}K^\mp, D_s^{\ast\pm}K^\mp, ...$ and $B_d\to D^{\pm}\pi^\mp,
D^{\ast\pm}\pi^\mp, ...$ Decays | 27 pages, 3 figures, sign error in factorization section corrected
and comment on new BaBar result added | Nucl.Phys. B671 (2003) 459-482 | 10.1016/j.nuclphysb.2003.08.010 | CERN-TH/2003-084 | hep-ph | null | Decays of the kind $B_s\to D_s^{\pm}K^\mp, D_s^{\ast\pm}K^\mp, ...$ and
$B_d\to D^{\pm}\pi^\mp, D^{\ast\pm}\pi^\mp, ...$ allow us to probe
$\phi_s+\gamma$ and $\phi_d+\gamma$, respectively, involving the angle $\gamma$
of the unitarity triangle and the $B^0_q$--$\bar B^0_q$ mixing phases $\phi_q$
($q\in\{d,s\}$). Analysing these modes in a phase-convention-independent way,
we find that their mixing-induced observables are affected by a subtle $(-1)^L$
factor, where $L$ denotes the angular momentum of the $B_q$ decay products, and
derive bounds on $\phi_q+\gamma$. Moreover, we emphasize that ``untagged''
rates are an important ingredient for efficient determinations of weak phases,
not only in the presence of a sizeable width difference $\Delta\Gamma_q$;
should $\Delta\Gamma_s$ be sizeable, the combination of untagged with tagged
$B_s\to D_s^{\pm}K^\mp,D_s^{\ast\pm}K^\mp, ...$ observables provides an elegant
and unambiguous extraction of $\tan(\phi_s+\gamma)$, whereas the conventional
determination of $\phi_s+\gamma$ is affected by an eightfold discrete
ambiguity. Finally, we propose a combined analysis of $B_s\to D_s^{\pm}K^\mp,
D_s^{\ast\pm}K^\mp, ...$ and $B_d\to D^{\pm}\pi^\mp, D^{\ast\pm}\pi^\mp, ...$
modes, which has important advantages, offering various interesting new
strategies to extract $\gamma$ in an essentially unambiguous manner.
| [
{
"created": "Thu, 3 Apr 2003 08:55:04 GMT",
"version": "v1"
},
{
"created": "Fri, 1 Aug 2003 08:33:44 GMT",
"version": "v2"
}
] | 2010-04-05 | [
[
"Fleischer",
"Robert",
"",
"CERN"
]
] | Decays of the kind $B_s\to D_s^{\pm}K^\mp, D_s^{\ast\pm}K^\mp, ...$ and $B_d\to D^{\pm}\pi^\mp, D^{\ast\pm}\pi^\mp, ...$ allow us to probe $\phi_s+\gamma$ and $\phi_d+\gamma$, respectively, involving the angle $\gamma$ of the unitarity triangle and the $B^0_q$--$\bar B^0_q$ mixing phases $\phi_q$ ($q\in\{d,s\}$). Analysing these modes in a phase-convention-independent way, we find that their mixing-induced observables are affected by a subtle $(-1)^L$ factor, where $L$ denotes the angular momentum of the $B_q$ decay products, and derive bounds on $\phi_q+\gamma$. Moreover, we emphasize that ``untagged'' rates are an important ingredient for efficient determinations of weak phases, not only in the presence of a sizeable width difference $\Delta\Gamma_q$; should $\Delta\Gamma_s$ be sizeable, the combination of untagged with tagged $B_s\to D_s^{\pm}K^\mp,D_s^{\ast\pm}K^\mp, ...$ observables provides an elegant and unambiguous extraction of $\tan(\phi_s+\gamma)$, whereas the conventional determination of $\phi_s+\gamma$ is affected by an eightfold discrete ambiguity. Finally, we propose a combined analysis of $B_s\to D_s^{\pm}K^\mp, D_s^{\ast\pm}K^\mp, ...$ and $B_d\to D^{\pm}\pi^\mp, D^{\ast\pm}\pi^\mp, ...$ modes, which has important advantages, offering various interesting new strategies to extract $\gamma$ in an essentially unambiguous manner. |
hep-ph/9511245 | Marcelo Moraes Guzzo | V.M. Aquino, J. Bellandi and M.M. Guzzo | On mixing angles and resonances in three neutrino oscillations in matter | 14 pages, revtex, 4 figures in 4 post script files appended in the
end of the text | Braz.J.Phys. 27 (1997) 384-391 | null | null | hep-ph | null | We find exact analytical expressions for mixing angles in matter in the
context of three generation neutrino oscillations in matter to discuss the role
of resonances in this phenomenon. We show that some knowledge from conventional
two neutrino MSW effect, which has been extended to approximated solutions to
three neutrino oscillations, has to be abandoned in this exact approach. We
observe that maximal values for the mixing angles in matter are found in
nonresonant regions and stationary phases do not coincide anymore with
resonances in this simple extension of the MSW effect. We present a general way
to identify a resonance and discuss what we can physically expect in these
regions.
| [
{
"created": "Mon, 6 Nov 1995 12:42:49 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Aquino",
"V. M.",
""
],
[
"Bellandi",
"J.",
""
],
[
"Guzzo",
"M. M.",
""
]
] | We find exact analytical expressions for mixing angles in matter in the context of three generation neutrino oscillations in matter to discuss the role of resonances in this phenomenon. We show that some knowledge from conventional two neutrino MSW effect, which has been extended to approximated solutions to three neutrino oscillations, has to be abandoned in this exact approach. We observe that maximal values for the mixing angles in matter are found in nonresonant regions and stationary phases do not coincide anymore with resonances in this simple extension of the MSW effect. We present a general way to identify a resonance and discuss what we can physically expect in these regions. |
1410.1345 | Mauro Cambiaso | Mauro Cambiaso, Ralf Lehnert and Robertus Potting | Renormalization and asymptotic states in Lorentz-violating QFT | "Presented at the Sixth Meeting on CPT and Lorentz Symmetry,
Bloomington, Indiana, June 17-21, 2013" | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Radiative corrections in quantum field theories with small departures from
Lorentz symmetry alter structural aspects of the theory, in particular the
definition of asymptotic single-particle states. Specifically, the mass-shell
condition, the standard renormalization procedure as well as the
Lehmann-Symanzik-Zimmermann reduction formalism are affected.
| [
{
"created": "Mon, 6 Oct 2014 12:29:07 GMT",
"version": "v1"
}
] | 2014-10-07 | [
[
"Cambiaso",
"Mauro",
""
],
[
"Lehnert",
"Ralf",
""
],
[
"Potting",
"Robertus",
""
]
] | Radiative corrections in quantum field theories with small departures from Lorentz symmetry alter structural aspects of the theory, in particular the definition of asymptotic single-particle states. Specifically, the mass-shell condition, the standard renormalization procedure as well as the Lehmann-Symanzik-Zimmermann reduction formalism are affected. |
1112.2704 | Brian Shuve | Yanou Cui, Lisa Randall, Brian Shuve | A WIMPy Baryogenesis Miracle | 30 pages, 17 figures, version to appear in JHEP | null | 10.1007/JHEP04(2012)075 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore models in which weakly interacting massive particle (WIMP) dark
matter annihilation is directly responsible for baryogenesis, thereby
connecting dark matter with baryogenesis. We call this process "WIMPy
baryogenesis". The dark matter relic density in these models, as with
conventional WIMP models, is obtained with only order one couplings and
TeV-scale masses according to the WIMP miracle. Thus, WIMPy baryogenesis models
naturally accommodate weak-scale dark matter. Furthermore, an extension of the
WIMP miracle simultaneously explains the observed baryon asymmetry and the
correct dark matter abundance. The models we present have the further feature
that they create the baryon number asymmetry at the weak scale, thereby
avoiding the problems in some models of baryogenesis associated with high
reheat temperatures in supersymmetric theories. Some of these models yield
observable consequences in ongoing and future experiments.
| [
{
"created": "Mon, 12 Dec 2011 21:00:02 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Jan 2012 21:03:29 GMT",
"version": "v2"
},
{
"created": "Mon, 19 Mar 2012 21:27:40 GMT",
"version": "v3"
}
] | 2015-06-03 | [
[
"Cui",
"Yanou",
""
],
[
"Randall",
"Lisa",
""
],
[
"Shuve",
"Brian",
""
]
] | We explore models in which weakly interacting massive particle (WIMP) dark matter annihilation is directly responsible for baryogenesis, thereby connecting dark matter with baryogenesis. We call this process "WIMPy baryogenesis". The dark matter relic density in these models, as with conventional WIMP models, is obtained with only order one couplings and TeV-scale masses according to the WIMP miracle. Thus, WIMPy baryogenesis models naturally accommodate weak-scale dark matter. Furthermore, an extension of the WIMP miracle simultaneously explains the observed baryon asymmetry and the correct dark matter abundance. The models we present have the further feature that they create the baryon number asymmetry at the weak scale, thereby avoiding the problems in some models of baryogenesis associated with high reheat temperatures in supersymmetric theories. Some of these models yield observable consequences in ongoing and future experiments. |
hep-ph/0409245 | Motoi Endo | Motoi Endo, Satoshi Mishima and Masahiro Yamaguchi | Recent Measurements of CP Asymmetries of B \to \phi K^0 and B \to \eta'
K_S at B-factories Suggest New CP Violation in Left-Handed Squark Mixing | 11 pages, 1 figure | Phys.Lett. B609 (2005) 95-101 | 10.1016/j.physletb.2004.12.049 | TU-730 | hep-ph | null | Recent results on the mixing-induced CP asymmetries of B \to \phi K^0 and B
\to \eta' K_S measured at B-factories appear to indicate discrepancies from the
Standard Model expectation. Explanation of this possible anomaly is given in
the context of supersymmetric extension of the Standard Model. It is shown that
the present data, if the average of two experiments is taken, implies
additional CP violation appearing in the generation mixing of left-handed
squarks rather than that of right-handed ones. This explanation is argued to
disfavor many mediation mechanisms of supersymmetry breaking, including minimal
supergravity, because renormalization group effects via Yukawa interaction are
unlikely to generate the desired mass mixing.
| [
{
"created": "Tue, 21 Sep 2004 10:43:25 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Sep 2004 10:03:14 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Endo",
"Motoi",
""
],
[
"Mishima",
"Satoshi",
""
],
[
"Yamaguchi",
"Masahiro",
""
]
] | Recent results on the mixing-induced CP asymmetries of B \to \phi K^0 and B \to \eta' K_S measured at B-factories appear to indicate discrepancies from the Standard Model expectation. Explanation of this possible anomaly is given in the context of supersymmetric extension of the Standard Model. It is shown that the present data, if the average of two experiments is taken, implies additional CP violation appearing in the generation mixing of left-handed squarks rather than that of right-handed ones. This explanation is argued to disfavor many mediation mechanisms of supersymmetry breaking, including minimal supergravity, because renormalization group effects via Yukawa interaction are unlikely to generate the desired mass mixing. |
1704.01421 | Jialun Ping | Hongxia Huang, Jialun Ping, Fan Wang | Investigating the excited $\Omega^{0}_{c}$ states through $\Xi_{c}K$ and
$\Xi^{'}_{c}K$ decay channels | 6 pages, 2 figures | Phys. Rev. D 97, 034027 (2018) | 10.1103/PhysRevD.97.034027 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Inspired by the five newly observed $\Omega^{0}_{c}$ states by the LHCb
detector, we study the $\Omega_{c}^{0}$ states as the $S-$wave molecular
pentaquarks with $I=0$, $J^{P}=\frac{1}{2}^{-}$, $\frac{3}{2}^{-}$, and
$\frac{5}{2}^{-}$ by solving the RGM equation in the framework of chiral quark
model. Both the energies and the decay widths are obtained in this work. Our
results suggest that $\Omega_{c}(3119)^{0}$ can be explained as an $S-$wave
resonance state of $\Xi D$ with $J^{P}=\frac{1}{2}^{-}$, and the decay channels
are the $S-$wave $\Xi_{c} K$ and $\Xi^{'}_{c}K$ . Other reported
$\Omega^{0}_{c}$ states cannot be obtained in our present calculation. Another
$\Omega_{c}^{0}$ state with much higher mass 3533 MeV with
$J^{P}=\frac{5}{2}^{-}$ is also obtained. In addition, the calculation is
extended to the $\Omega_{b}^{0}$ states, similar results as that of
$\Omega^{0}_{c}$ are obtained.
| [
{
"created": "Wed, 5 Apr 2017 13:41:21 GMT",
"version": "v1"
}
] | 2018-03-07 | [
[
"Huang",
"Hongxia",
""
],
[
"Ping",
"Jialun",
""
],
[
"Wang",
"Fan",
""
]
] | Inspired by the five newly observed $\Omega^{0}_{c}$ states by the LHCb detector, we study the $\Omega_{c}^{0}$ states as the $S-$wave molecular pentaquarks with $I=0$, $J^{P}=\frac{1}{2}^{-}$, $\frac{3}{2}^{-}$, and $\frac{5}{2}^{-}$ by solving the RGM equation in the framework of chiral quark model. Both the energies and the decay widths are obtained in this work. Our results suggest that $\Omega_{c}(3119)^{0}$ can be explained as an $S-$wave resonance state of $\Xi D$ with $J^{P}=\frac{1}{2}^{-}$, and the decay channels are the $S-$wave $\Xi_{c} K$ and $\Xi^{'}_{c}K$ . Other reported $\Omega^{0}_{c}$ states cannot be obtained in our present calculation. Another $\Omega_{c}^{0}$ state with much higher mass 3533 MeV with $J^{P}=\frac{5}{2}^{-}$ is also obtained. In addition, the calculation is extended to the $\Omega_{b}^{0}$ states, similar results as that of $\Omega^{0}_{c}$ are obtained. |
hep-ph/9812206 | Peter Lichard | Peter Lichard (Department of Physics, State University of New York at
Stony Brook, USA) | Consistency of data on soft photon production in hadronic interactions | 25 pages, RevTeX, epsf.sty, 12 embedded figures | Phys.Rev.D50:6824-6835,1994 | 10.1103/PhysRevD.50.6824 | SUNY-NTG-94-41 | hep-ph | null | The glob model of Lichard and Van Hove and the modified soft annihilation
model (MSAM) of Lichard and Thompson are used as a phenomenological tool for
relating results from various experiments on soft photon production in high
energy collisions. The total phenomenological expectation is composed of
contributions from classical bremsstrahlung, the soft annihilation model and
the glob model. The empirical excess above the background from hadronic decays
at very small longitudinal momenta of photons is well reproduced, as well as
that for transverse momenta pT >~ 10 MeV/c. Some data do not require the glob
model and MSAM components in the phenomenological mixture, but do not exclude
them. On the basis of consistency of all data with the total theoretical
expectation we argue that the results of all experiments are mutually
consistent. The models are unable to describe the excess of ultrasoft photons
(pT <~ 10 MeV/c), seen by some, but not all, experiments. This may indicate an
as yet unknown projectile-mass-dependent production mechanism. Possible
relations of soft photon production to other phenomena are discussed. A
simple-to-use, but physically equivalent version of the glob model is
developed, which enables an easy check of presented results.
| [
{
"created": "Tue, 1 Dec 1998 10:41:46 GMT",
"version": "v1"
}
] | 2011-07-19 | [
[
"Lichard",
"Peter",
"",
"Department of Physics, State University of New York at\n Stony Brook, USA"
]
] | The glob model of Lichard and Van Hove and the modified soft annihilation model (MSAM) of Lichard and Thompson are used as a phenomenological tool for relating results from various experiments on soft photon production in high energy collisions. The total phenomenological expectation is composed of contributions from classical bremsstrahlung, the soft annihilation model and the glob model. The empirical excess above the background from hadronic decays at very small longitudinal momenta of photons is well reproduced, as well as that for transverse momenta pT >~ 10 MeV/c. Some data do not require the glob model and MSAM components in the phenomenological mixture, but do not exclude them. On the basis of consistency of all data with the total theoretical expectation we argue that the results of all experiments are mutually consistent. The models are unable to describe the excess of ultrasoft photons (pT <~ 10 MeV/c), seen by some, but not all, experiments. This may indicate an as yet unknown projectile-mass-dependent production mechanism. Possible relations of soft photon production to other phenomena are discussed. A simple-to-use, but physically equivalent version of the glob model is developed, which enables an easy check of presented results. |
hep-ph/0506024 | Stefan Dittmaier | A.Bredenstein, S.Dittmaier and M.Roth | Precision calculations for gamma gamma --> WW --> 4fermions(+gamma) | 6 pages, latex, 10 postscript figures, to appear in the proceedings
of the "2005 International Linear Collider Workshop" (LCWS05), Stanford 2005 | null | null | null | hep-ph | null | The O(alpha) electroweak radiative corrections to gamma gamma --> WW --> 4f
within the electroweak Standard Model are calculated in double-pole
approximation (DPA). Virtual corrections are treated in DPA, and real-photonic
corrections are based on complete lowest-order matrix elements for gamma gamma
--> 4f+gamma. The radiative corrections are implemented in a Monte Carlo
generator called COFFERgammagamma, which optionally includes anomalous triple
and quartic gauge-boson couplings in addition and performs a convolution over
realistic spectra of the photon beams. A brief survey of numerical results
comprises O(alpha) corrections to integrated cross sections as well as to
angular and invariant-mass distributions.
| [
{
"created": "Fri, 3 Jun 2005 09:42:14 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Bredenstein",
"A.",
""
],
[
"Dittmaier",
"S.",
""
],
[
"Roth",
"M.",
""
]
] | The O(alpha) electroweak radiative corrections to gamma gamma --> WW --> 4f within the electroweak Standard Model are calculated in double-pole approximation (DPA). Virtual corrections are treated in DPA, and real-photonic corrections are based on complete lowest-order matrix elements for gamma gamma --> 4f+gamma. The radiative corrections are implemented in a Monte Carlo generator called COFFERgammagamma, which optionally includes anomalous triple and quartic gauge-boson couplings in addition and performs a convolution over realistic spectra of the photon beams. A brief survey of numerical results comprises O(alpha) corrections to integrated cross sections as well as to angular and invariant-mass distributions. |
0809.3312 | Hisakazu Minakata | Takashi Kikuchi, Hisakazu Minakata, Shoichi Uchinami | Perturbation Theory of Neutrino Oscillation with Nonstandard Neutrino
Interactions | manuscript restructured, discussion of new type of parameter
degeneracy added. 47 pages | JHEP 0903:114,2009 | 10.1088/1126-6708/2009/03/114 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss various physics aspects of neutrino oscillation with non-standard
interactions (NSI). We formulate a perturbative framework by taking \Delta
m^2_{21} / \Delta m^2_{31}, s_{13}, and the NSI elements \epsilon_{\alpha
\beta} (\alpha, \beta = e, \mu, \tau) as small expansion parameters of the same
order \epsilon. Within the \epsilon perturbation theory we obtain the S matrix
elements and the neutrino oscillation probability formula to second order
(third order in \nu_e related channels) in \epsilon. The formula allows us to
estimate size of the contribution of any particular NSI element
\epsilon_{\alpha beta} to the oscillation probability in arbitrary channels,
and gives a global bird-eye view of the neutrino oscillation phenomena with
NSI. Based on the second-order formula we discuss how all the conventional
lepton mixing as well as NSI parameters can be determined. Our results shows
that while \theta_{13}, \delta, and the NSI elements in \nu_e sector can in
principle be determined, complete measurement of the NSI parameters in the
\nu_\mu - \nu_\tau sector is not possible by the rate only analysis. The
discussion for parameter determination and the analysis based on the matter
perturbation theory indicate that the parameter degeneracy prevails with the
NSI parameters. In addition, a new solar-atmospheric variable exchange
degeneracy is found. Some general properties of neutrino oscillation with and
without NSI are also illuminated.
| [
{
"created": "Fri, 19 Sep 2008 10:55:12 GMT",
"version": "v1"
},
{
"created": "Fri, 6 Feb 2009 00:44:33 GMT",
"version": "v2"
}
] | 2009-03-27 | [
[
"Kikuchi",
"Takashi",
""
],
[
"Minakata",
"Hisakazu",
""
],
[
"Uchinami",
"Shoichi",
""
]
] | We discuss various physics aspects of neutrino oscillation with non-standard interactions (NSI). We formulate a perturbative framework by taking \Delta m^2_{21} / \Delta m^2_{31}, s_{13}, and the NSI elements \epsilon_{\alpha \beta} (\alpha, \beta = e, \mu, \tau) as small expansion parameters of the same order \epsilon. Within the \epsilon perturbation theory we obtain the S matrix elements and the neutrino oscillation probability formula to second order (third order in \nu_e related channels) in \epsilon. The formula allows us to estimate size of the contribution of any particular NSI element \epsilon_{\alpha beta} to the oscillation probability in arbitrary channels, and gives a global bird-eye view of the neutrino oscillation phenomena with NSI. Based on the second-order formula we discuss how all the conventional lepton mixing as well as NSI parameters can be determined. Our results shows that while \theta_{13}, \delta, and the NSI elements in \nu_e sector can in principle be determined, complete measurement of the NSI parameters in the \nu_\mu - \nu_\tau sector is not possible by the rate only analysis. The discussion for parameter determination and the analysis based on the matter perturbation theory indicate that the parameter degeneracy prevails with the NSI parameters. In addition, a new solar-atmospheric variable exchange degeneracy is found. Some general properties of neutrino oscillation with and without NSI are also illuminated. |
hep-ph/0003093 | Joseph | E.A.Kuraev, J.Manjavidze and A.Sissakian | Multiplicity distribution tails at high energies | 9 pages, LaTex | null | null | null | hep-ph | null | The idea that the hard channels may dominate in the very high multiplicity
processes is investigated. Quantitative realization of the `hard Pomeron', deep
inelastic scattering and large-angle annihilation mechanism combinations are
considered in the pQCD frame for this purpose.
| [
{
"created": "Fri, 10 Mar 2000 06:19:00 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kuraev",
"E. A.",
""
],
[
"Manjavidze",
"J.",
""
],
[
"Sissakian",
"A.",
""
]
] | The idea that the hard channels may dominate in the very high multiplicity processes is investigated. Quantitative realization of the `hard Pomeron', deep inelastic scattering and large-angle annihilation mechanism combinations are considered in the pQCD frame for this purpose. |
1804.02604 | Rainer Dick | Rainer Dick | Direct signals from electroweak singlets through the Higgs portal | V2: Final version. References added and exclusion limits also
reported for a Higgs-nucleon coupling gv_h = 289 MeV in addition to the SVZ
value gv_h = 210 MeV. Additional remarks on the unitarity limit, and on
annihilation cross sections and the partial Higgs decay width in the vector
Higgs portal model are also included | null | 10.1142/S0218271818300082 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review predictions and constraints for nuclear recoil signals from Higgs
portal dark matter under the assumption of standard thermal creation from
freeze-out. Thermally created scalar and vector Higgs portal dark matter masses
are constrained to be in the resonance region near half the Higgs mass or above
several TeV. The resonance region for these models will be tested by XENONnT
and LZ. The full mass range up to the unitarity limit can be tested by
DarkSide-20k and DARWIN. Fermionic Higgs portal dark matter with a pure CP odd
coupling is constrained by the Higgs decay width, but has strongly suppressed
recoil cross sections which cannot be tested with upcoming experiments.
Fermionic Higgs portal dark matter with a combination of CP even and odd Higgs
couplings can be constrained by the direct search experiments.
| [
{
"created": "Sun, 8 Apr 2018 00:15:47 GMT",
"version": "v1"
},
{
"created": "Thu, 31 May 2018 01:22:28 GMT",
"version": "v2"
}
] | 2019-01-23 | [
[
"Dick",
"Rainer",
""
]
] | We review predictions and constraints for nuclear recoil signals from Higgs portal dark matter under the assumption of standard thermal creation from freeze-out. Thermally created scalar and vector Higgs portal dark matter masses are constrained to be in the resonance region near half the Higgs mass or above several TeV. The resonance region for these models will be tested by XENONnT and LZ. The full mass range up to the unitarity limit can be tested by DarkSide-20k and DARWIN. Fermionic Higgs portal dark matter with a pure CP odd coupling is constrained by the Higgs decay width, but has strongly suppressed recoil cross sections which cannot be tested with upcoming experiments. Fermionic Higgs portal dark matter with a combination of CP even and odd Higgs couplings can be constrained by the direct search experiments. |
2106.06548 | Kevin Kelly | Kevin J. Kelly and Pedro A.N. Machado | The MicroBooNE Experiment, the NuMI Absorber, and Heavy Neutral Leptons | 5 pages plus references, 4 figures. Monte Carlo code available at
https://github.com/kjkellyphys/muBHNL. v2: Updated references, typo in
equation fixed (results unchanged), matches published version | Phys. Rev. D 104, 055015 (2021) | 10.1103/PhysRevD.104.055015 | FERMILAB-PUB-21-277-T | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | Motivated by the recent search for a Higgs-Portal Scalar decaying inside the
MicroBooNE detector, we demonstrate that the same search can be used to
constrain Heavy Neutral Leptons. These are gauge-singlet fermions that interact
with the Standard Model by mixing with neutrinos only and could be related to
the origin of neutrino masses. By recasting the results of the MicroBooNE
Collaboration's analysis, we show that, for a Heavy Neutral Lepton that mixes
predominantly with muon-flavored neutrinos, previously unexplored parameter
space can be excluded for masses between 30 and 150 MeV. Additionally, we make
our Monte Carlo tools publicly available.
| [
{
"created": "Fri, 11 Jun 2021 18:00:02 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Sep 2021 16:01:51 GMT",
"version": "v2"
}
] | 2021-09-22 | [
[
"Kelly",
"Kevin J.",
""
],
[
"Machado",
"Pedro A. N.",
""
]
] | Motivated by the recent search for a Higgs-Portal Scalar decaying inside the MicroBooNE detector, we demonstrate that the same search can be used to constrain Heavy Neutral Leptons. These are gauge-singlet fermions that interact with the Standard Model by mixing with neutrinos only and could be related to the origin of neutrino masses. By recasting the results of the MicroBooNE Collaboration's analysis, we show that, for a Heavy Neutral Lepton that mixes predominantly with muon-flavored neutrinos, previously unexplored parameter space can be excluded for masses between 30 and 150 MeV. Additionally, we make our Monte Carlo tools publicly available. |
hep-ph/0606188 | Zurab Tavartkiladze | Qaisar Shafi, Zurab Tavartkiladze | \theta_13, Rare Processes and Proton Decay in Flipped SU(5) | Discussion on leptogenesis and CP violation, and references added | null | null | BA-06016, CERN-PH-TH/2006-067 | hep-ph | null | We consider an extended flipped SU(5) model, supplemented by a flavor ${\cal
U}(1)$ symmetry, which yields bi-large neutrino mixings, charged fermion mass
hierarchies and CKM mixings. The third leptonic mixing angle $\te_{13}$ turns
out to lie close to 0.07, and neutrino CP violation can be estimated from the
observed baryon asymmetry. For lepton flavor violating processes we find the
branching ratios, ${\rm BR}(\mu \to e\ga)\sim {\rm BR}(\tau \to e \ga) \sim
10^{-4}\cdot {\rm BR}(\tau \to \mu \ga) \stackrel{<}{_\sim}5\cdot 10^{-14}$.
The proton lifetime $\tau_{p\to \pi^0 e^{+}}\simeq 10^{34}-10^{36}$ yrs.
| [
{
"created": "Sun, 18 Jun 2006 10:18:52 GMT",
"version": "v1"
},
{
"created": "Sat, 21 Oct 2006 19:59:05 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Shafi",
"Qaisar",
""
],
[
"Tavartkiladze",
"Zurab",
""
]
] | We consider an extended flipped SU(5) model, supplemented by a flavor ${\cal U}(1)$ symmetry, which yields bi-large neutrino mixings, charged fermion mass hierarchies and CKM mixings. The third leptonic mixing angle $\te_{13}$ turns out to lie close to 0.07, and neutrino CP violation can be estimated from the observed baryon asymmetry. For lepton flavor violating processes we find the branching ratios, ${\rm BR}(\mu \to e\ga)\sim {\rm BR}(\tau \to e \ga) \sim 10^{-4}\cdot {\rm BR}(\tau \to \mu \ga) \stackrel{<}{_\sim}5\cdot 10^{-14}$. The proton lifetime $\tau_{p\to \pi^0 e^{+}}\simeq 10^{34}-10^{36}$ yrs. |
hep-ph/0003239 | Masahisa Matsuda | M. Matsuda and T. Matsuoka | Quark Mixings in $SU(6)\times SU(2)_R$ and Suppression of $V_{ub}$ | 10pages with no figure, Latex file | Phys.Lett. B487 (2000) 104-109 | 10.1016/S0370-2693(00)00816-9 | AUE-00-01 KGKU-00-02 | hep-ph | null | The quark mixing matrix $V_{CKM}$ is studied in depth on the basis of
superstring inspired $SU(6)\times SU(2)_R$ model with global flavor symmetries.
The sizable mixings between right-handed down-type quark $D^c$ and colored
Higgs field $g^c$ potentially occur but no such mixings in up-type quark
sector. In the model the hierarchical pattern of $V_{CKM}$ is understood
systematically. It is shown that due to large $D^c$-$g^c$ mixings $V_{ub}$ is
naturally suppressed compared to $V_{td}$. It is pointed out that the observed
suppression of $V_{ub}$ is in favor of the presence of $SU(2)_R$ gauge symmetry
but not in accord with generic SU(5) GUT.
| [
{
"created": "Fri, 24 Mar 2000 04:44:34 GMT",
"version": "v1"
},
{
"created": "Fri, 26 May 2000 07:15:22 GMT",
"version": "v2"
},
{
"created": "Fri, 7 Jul 2000 01:27:53 GMT",
"version": "v3"
}
] | 2009-10-31 | [
[
"Matsuda",
"M.",
""
],
[
"Matsuoka",
"T.",
""
]
] | The quark mixing matrix $V_{CKM}$ is studied in depth on the basis of superstring inspired $SU(6)\times SU(2)_R$ model with global flavor symmetries. The sizable mixings between right-handed down-type quark $D^c$ and colored Higgs field $g^c$ potentially occur but no such mixings in up-type quark sector. In the model the hierarchical pattern of $V_{CKM}$ is understood systematically. It is shown that due to large $D^c$-$g^c$ mixings $V_{ub}$ is naturally suppressed compared to $V_{td}$. It is pointed out that the observed suppression of $V_{ub}$ is in favor of the presence of $SU(2)_R$ gauge symmetry but not in accord with generic SU(5) GUT. |
hep-ph/9801232 | Mark Trodden | Minos Axenides, Leandros Perivolaropoulos and Mark Trodden | Phase Transitions in the Core of Global Embedded Defects | 13 pages, 2 figures, LaTeX | Phys. Rev. D 58, 083505 (1998) | 10.1103/PhysRevD.58.083505 | CWRU-P22-97, CRETE-97/20 | hep-ph astro-ph | null | We demonstrate the existence of global monopole and vortex configurations
whose core exhibits a phase structure. We determine the critical values of
parameters for which the transition from the symmetric to the non-symmetric
phase occurs and discuss the novel dynamics implied by the non-symmetric cores
for defect interactions. We model phase transitions in the core of global
embedded topological defects by identifying the relevant parameters with the
vacuum expectation value of a dynamical scalar field. Finally, we argue that
superheavy defects that undergo a core phase transition in the very early
universe provide a novel realization for topological inflation.
| [
{
"created": "Wed, 7 Jan 1998 17:06:54 GMT",
"version": "v1"
}
] | 2016-08-25 | [
[
"Axenides",
"Minos",
""
],
[
"Perivolaropoulos",
"Leandros",
""
],
[
"Trodden",
"Mark",
""
]
] | We demonstrate the existence of global monopole and vortex configurations whose core exhibits a phase structure. We determine the critical values of parameters for which the transition from the symmetric to the non-symmetric phase occurs and discuss the novel dynamics implied by the non-symmetric cores for defect interactions. We model phase transitions in the core of global embedded topological defects by identifying the relevant parameters with the vacuum expectation value of a dynamical scalar field. Finally, we argue that superheavy defects that undergo a core phase transition in the very early universe provide a novel realization for topological inflation. |
1908.04798 | Benjamin Summ | Michael Kr\"amer, Benjamin Summ and Alexander Voigt | Completing the scalar and fermionic Universal One-Loop Effective Action | 40 pages, no figures, 2 Mathematica package files, minor changes in
formulations and naming of sections, some coefficients in the ancillary files
corrected | null | 10.1007/JHEP01(2020)079 | TTK-19-31, P3H-19-026 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We extend the known Universal One-Loop Effective Action (UOLEA) by all
operators which involve scalars and fermions, not including contributions
arising from open covariant derivatives. Our generic analytic expressions for
the one-loop Wilson coefficients of effective operators up to dimension six
allow for an application of the UOLEA to a broader class of UV-complete models.
We apply our generic results to various effective theories of supersymmetric
models, where different supersymmetric particles are integrated out at a high
mass scale.
| [
{
"created": "Tue, 13 Aug 2019 18:01:05 GMT",
"version": "v1"
},
{
"created": "Fri, 30 Aug 2019 13:17:31 GMT",
"version": "v2"
},
{
"created": "Mon, 4 Nov 2019 08:49:48 GMT",
"version": "v3"
}
] | 2020-01-29 | [
[
"Krämer",
"Michael",
""
],
[
"Summ",
"Benjamin",
""
],
[
"Voigt",
"Alexander",
""
]
] | We extend the known Universal One-Loop Effective Action (UOLEA) by all operators which involve scalars and fermions, not including contributions arising from open covariant derivatives. Our generic analytic expressions for the one-loop Wilson coefficients of effective operators up to dimension six allow for an application of the UOLEA to a broader class of UV-complete models. We apply our generic results to various effective theories of supersymmetric models, where different supersymmetric particles are integrated out at a high mass scale. |
hep-ph/9307216 | null | Matthias Neubert | Heavy Hadron Weak Decay Form Factors to Next-to-Leading Order in 1/m | 17 pages LaTeX, SLAC-PUB-6258 | Nucl.Phys. B416 (1994) 786-800 | 10.1016/0550-3213(94)90555-X | null | hep-ph | null | Based on the short-distance expansion of currents in the heavy quark
effective theory, we derive the exact expressions for the heavy-to-heavy meson
and baryon weak decay form factors to order $1/m_Q$ in the heavy quark
expansion, and to all orders in perturbation theory. We emphasize that the
Wilson coefficients in this expansion depend on a kinematic variable $\bar w$
that is different from the velocity transfer $w=v\cdot v'$ of the hadrons. Our
results generalize existing ones obtained in the leading-logarithmic
approximation. Some phenomenological applications are briefly discussed.
| [
{
"created": "Sat, 3 Jul 1993 01:10:00 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Neubert",
"Matthias",
""
]
] | Based on the short-distance expansion of currents in the heavy quark effective theory, we derive the exact expressions for the heavy-to-heavy meson and baryon weak decay form factors to order $1/m_Q$ in the heavy quark expansion, and to all orders in perturbation theory. We emphasize that the Wilson coefficients in this expansion depend on a kinematic variable $\bar w$ that is different from the velocity transfer $w=v\cdot v'$ of the hadrons. Our results generalize existing ones obtained in the leading-logarithmic approximation. Some phenomenological applications are briefly discussed. |
1505.05968 | Wojciech Kotlarski | Philip Diessner and Wojciech Kotlarski | Higgs and the electroweak precision observables in the MRSSM | 6 pages, 3 figures, 1 table; submitted to the proceedings of Corfu
Summer School and Workshop on the Standard Model and Beyond (2014) | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We briefly review recent progress in the analysis of the Higgs sector of the
Minimal R-symmetric Supersymmetric Standard Model. Importance of the interplay
between W and Higgs boson masses in constraining the parameter space of the
model is shown.
| [
{
"created": "Fri, 22 May 2015 07:03:37 GMT",
"version": "v1"
}
] | 2015-05-25 | [
[
"Diessner",
"Philip",
""
],
[
"Kotlarski",
"Wojciech",
""
]
] | We briefly review recent progress in the analysis of the Higgs sector of the Minimal R-symmetric Supersymmetric Standard Model. Importance of the interplay between W and Higgs boson masses in constraining the parameter space of the model is shown. |
hep-ph/0007002 | Bernd Andreas Kniehl | Bernd A. Kniehl, Caesar P. Palisoc, Alberto Sirlin | Higgs-Boson Production and Decay Close to Thresholds | 18 pages (Latex), 4 figures (Postscript); two references added; to
appear in Nuclear Physics B | Nucl.Phys. B591 (2000) 296-310 | 10.1016/S0550-3213(00)00563-0 | DESY 00-079 | hep-ph | null | At one loop in the conventional on-mass-shell renormalization scheme, the
production and decay rates of the Higgs boson H exhibit singularities
proportional to (2 M_V - M)^{-1/2} as the Higgs-boson mass M approaches from
below the pair-production threshold of a vector boson V with mass M_V. This
problem is of phenomenological interest because the values 2 M_W and 2 M_Z,
corresponding to the W- and Z-boson thresholds, lie within the M range
presently favoured by electroweak precision data. We demonstrate how these
threshold singularities are eliminated when the definitions of mass and total
decay width of the Higgs boson are based on the complex-valued pole of its
propagator. We illustrate the phenomenological implications of this
modification for the partial width of the H -> W^+ W^- decay.
| [
{
"created": "Sun, 2 Jul 2000 11:01:58 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Oct 2000 09:47:20 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Kniehl",
"Bernd A.",
""
],
[
"Palisoc",
"Caesar P.",
""
],
[
"Sirlin",
"Alberto",
""
]
] | At one loop in the conventional on-mass-shell renormalization scheme, the production and decay rates of the Higgs boson H exhibit singularities proportional to (2 M_V - M)^{-1/2} as the Higgs-boson mass M approaches from below the pair-production threshold of a vector boson V with mass M_V. This problem is of phenomenological interest because the values 2 M_W and 2 M_Z, corresponding to the W- and Z-boson thresholds, lie within the M range presently favoured by electroweak precision data. We demonstrate how these threshold singularities are eliminated when the definitions of mass and total decay width of the Higgs boson are based on the complex-valued pole of its propagator. We illustrate the phenomenological implications of this modification for the partial width of the H -> W^+ W^- decay. |
hep-ph/9902285 | null | M. N. Chernodub, F. V. Gubarev, E.-M. Ilgenfritz, A. Schiller | Dynamics of Topological Defects in Electroweak Theory | 6 pages, 9 figures, contribution to SEWM'98, LaTeX using sprocl.sty
(included) | null | null | KANAZAWA-99-01, ITEP-TH-5/99 | hep-ph hep-lat | null | Embedded defects proposed long ago (Z-vortices and Nambu monopoles) have been
successfully searched for in 3D equilibrium lattice studies within the standard
model near the electroweak phase transition and the crossover (which follows it
for realistic Higgs mass). Gauge independent lattice-vortex operators are
proposed. Vortex condensation (percolation) is found to characterize the
high-temperature phase. Small vortex clusters are thermally activated with
non-negligible density on the low-temperature side only at higher Higgs mass,
where preliminary evidence supports their semiclassical nature.
| [
{
"created": "Tue, 9 Feb 1999 18:20:44 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Chernodub",
"M. N.",
""
],
[
"Gubarev",
"F. V.",
""
],
[
"Ilgenfritz",
"E. -M.",
""
],
[
"Schiller",
"A.",
""
]
] | Embedded defects proposed long ago (Z-vortices and Nambu monopoles) have been successfully searched for in 3D equilibrium lattice studies within the standard model near the electroweak phase transition and the crossover (which follows it for realistic Higgs mass). Gauge independent lattice-vortex operators are proposed. Vortex condensation (percolation) is found to characterize the high-temperature phase. Small vortex clusters are thermally activated with non-negligible density on the low-temperature side only at higher Higgs mass, where preliminary evidence supports their semiclassical nature. |
hep-ph/9909446 | null | Edmond L. Berger (Argonne), Lionel E. Gordon (Jefferson Lab and
Hampton University), and Michael Klasen (Argonne) | Spin Dependence of Massive Lepton Pair Production in Proton-Proton
Collisions | 34 pages, RevTeX including 17 figures in .ps files | Phys.Rev.D62:014014,2000 | 10.1103/PhysRevD.62.014014 | ANL-HEP-PR-99-97, JLAB-THY-99-27 | hep-ph | null | We calculate the transverse momentum distribution for the production of
massive lepton-pairs in longitudinally polarized proton-proton reactions at
collider energies within the context of perturbative quantum chromodynamics.
For values of the transverse momentum Q_T greater than roughly half the pair
mass Q, Q_T > Q/2, we show that the differential cross section is dominated by
subprocesses initiated by incident gluons, provided that the polarized gluon
density is not too small. Massive lepton-pair differential cross sections
should be a good source of independent constraints on the polarized gluon
density, free from the experimental and theoretical complications of photon
isolation that beset studies of prompt photon production. We provide
predictions for the spin-averaged and spin-dependent differential cross
sections as a function of Q_T at energies relevant for the Relativistic Heavy
Ion Collider (RHIC) at Brookhaven, and we compare these with predictions for
real prompt photon production.
| [
{
"created": "Mon, 20 Sep 1999 23:06:32 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Berger",
"Edmond L.",
"",
"Argonne"
],
[
"Gordon",
"Lionel E.",
"",
"Jefferson Lab and\n Hampton University"
],
[
"Klasen",
"Michael",
"",
"Argonne"
]
] | We calculate the transverse momentum distribution for the production of massive lepton-pairs in longitudinally polarized proton-proton reactions at collider energies within the context of perturbative quantum chromodynamics. For values of the transverse momentum Q_T greater than roughly half the pair mass Q, Q_T > Q/2, we show that the differential cross section is dominated by subprocesses initiated by incident gluons, provided that the polarized gluon density is not too small. Massive lepton-pair differential cross sections should be a good source of independent constraints on the polarized gluon density, free from the experimental and theoretical complications of photon isolation that beset studies of prompt photon production. We provide predictions for the spin-averaged and spin-dependent differential cross sections as a function of Q_T at energies relevant for the Relativistic Heavy Ion Collider (RHIC) at Brookhaven, and we compare these with predictions for real prompt photon production. |
hep-ph/0703203 | Davor Palle | Davor Palle (IRB, Zagreb, Hrvatska) | On Dyson-Schwinger equations and the number of fermion families | 14 pages, 6 figures, 4 tables, 15 references; few typos fixed; few
formulas and one table added, new exposition in text, one new reference | null | null | null | hep-ph astro-ph gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study Dyson-Schwinger equations for propagators of Dirac fermions
interacting with a massive gauge boson in the ladder approximation. The
equations have the form of the coupled nonlinear integral Fredholm equations of
the second kind in the spacelike domain. The solutions in the timelike domain
are completely defined by evaluations of integrals of the spacelike domain
solutions. We solve the equations and analyze the behavior of solutions on the
mass of the gauge boson, the coupling constant, and the ultraviolet cutoff. We
find that there are at least two solutions for the fixed gauge boson mass,
coupling, and the ultraviolet cutoff, thus there are at least two fermion
families. The zero-node solution represents the heaviest Dirac fermion state,
while the one-node solution is the lighter one. The mass gap between the two
families is of the order of magnitude observed in nature.
| [
{
"created": "Mon, 19 Mar 2007 16:46:13 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Sep 2008 13:35:11 GMT",
"version": "v2"
},
{
"created": "Wed, 25 Nov 2009 15:55:50 GMT",
"version": "v3"
}
] | 2009-11-25 | [
[
"Palle",
"Davor",
"",
"IRB, Zagreb, Hrvatska"
]
] | We study Dyson-Schwinger equations for propagators of Dirac fermions interacting with a massive gauge boson in the ladder approximation. The equations have the form of the coupled nonlinear integral Fredholm equations of the second kind in the spacelike domain. The solutions in the timelike domain are completely defined by evaluations of integrals of the spacelike domain solutions. We solve the equations and analyze the behavior of solutions on the mass of the gauge boson, the coupling constant, and the ultraviolet cutoff. We find that there are at least two solutions for the fixed gauge boson mass, coupling, and the ultraviolet cutoff, thus there are at least two fermion families. The zero-node solution represents the heaviest Dirac fermion state, while the one-node solution is the lighter one. The mass gap between the two families is of the order of magnitude observed in nature. |
1212.0260 | Karoly Urmossy | K. Urmossy | Multiplicity Dependence of Hadron Spectra in Proton-proton Collisions at
LHC Energies and Super-statistics | 9 pages, 10 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, transverse momentum spectra of pi+, K+ and p measured at fix
event-multiplicities and \sqrt s = 0.9, 2.76 and 7 TeV collision energies by
the CMS Collabotaion are shown to fit the Tsallis-distribution. It is found
that the power of the distribution shows a double-logarithmic dependence on the
event-multiplicity N, while the T parameter depends linearly on N. A similar
double-logarithmic dependence of the q parameter of pi0 spectra on the
collision energy \sqrt{s} is found too.
It is also shown that event-by-event fluctuations of the multiplicity N and
the total E_T energy going into the transverse region can be the reason for the
emergence of the Tsallis distribution in high-energy proton-proton collisions.
| [
{
"created": "Sun, 2 Dec 2012 23:50:41 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Feb 2013 17:34:36 GMT",
"version": "v2"
}
] | 2013-02-22 | [
[
"Urmossy",
"K.",
""
]
] | In this paper, transverse momentum spectra of pi+, K+ and p measured at fix event-multiplicities and \sqrt s = 0.9, 2.76 and 7 TeV collision energies by the CMS Collabotaion are shown to fit the Tsallis-distribution. It is found that the power of the distribution shows a double-logarithmic dependence on the event-multiplicity N, while the T parameter depends linearly on N. A similar double-logarithmic dependence of the q parameter of pi0 spectra on the collision energy \sqrt{s} is found too. It is also shown that event-by-event fluctuations of the multiplicity N and the total E_T energy going into the transverse region can be the reason for the emergence of the Tsallis distribution in high-energy proton-proton collisions. |
hep-ph/0407355 | Teiji Kunihiro | Teiji Kunihiro | Chiral Transition and Some Issues on the Scalar Mesons | Corrected typos | null | null | null | hep-ph | null | Some issues on the low-mass scalar mesons are discussed in relation to the
chiral transition of QCD vacuum. The importance to explore the possible
collective nature of the $\sigma$ meson is emphasized in association with the
chiral properties of nuclear media.
| [
{
"created": "Fri, 30 Jul 2004 02:50:27 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Sep 2004 14:42:14 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Kunihiro",
"Teiji",
""
]
] | Some issues on the low-mass scalar mesons are discussed in relation to the chiral transition of QCD vacuum. The importance to explore the possible collective nature of the $\sigma$ meson is emphasized in association with the chiral properties of nuclear media. |
1910.09788 | Juan Antonio Aguilar-Saavedra | J.A. Aguilar-Saavedra, M.L. Mangano | New physics with boosted single top production at the LHC and future
colliders | LaTeX 12 pages. Comments and references added. Final version in EPJC | null | 10.1140/epjc/s10052-019-7566-x | IFT-UAM/CSIC-19-129, CERN-TH-2019-170 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We address the potential of measurements with boosted single-top final states
at the high-luminosity LHC (HL-LHC) and possible future hadron colliders: the
high-energy LHC (HE-LHC), and the future circular collider (FCC). As new
physics examples to assess the potential, we consider the search for $tbW$
anomalous couplings and for a weakly-coupled $W'$ boson. The FCC would improve
by a factor of two the sensitivity to anomalous couplings of the HL-LHC. For
$W'$ bosons, the FCC is sensitive to $W'$ couplings $2-5$ times smaller than
the HL-LHC in the mass range 2-4 TeV, and to masses up to 30 TeV in the case of
Standard Model-like couplings.
| [
{
"created": "Tue, 22 Oct 2019 06:50:22 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Dec 2019 19:31:10 GMT",
"version": "v2"
}
] | 2020-01-29 | [
[
"Aguilar-Saavedra",
"J. A.",
""
],
[
"Mangano",
"M. L.",
""
]
] | We address the potential of measurements with boosted single-top final states at the high-luminosity LHC (HL-LHC) and possible future hadron colliders: the high-energy LHC (HE-LHC), and the future circular collider (FCC). As new physics examples to assess the potential, we consider the search for $tbW$ anomalous couplings and for a weakly-coupled $W'$ boson. The FCC would improve by a factor of two the sensitivity to anomalous couplings of the HL-LHC. For $W'$ bosons, the FCC is sensitive to $W'$ couplings $2-5$ times smaller than the HL-LHC in the mass range 2-4 TeV, and to masses up to 30 TeV in the case of Standard Model-like couplings. |
1705.08346 | Andrea Addazi AndAdd | Andrea Addazi, Antonino Marciano | Limiting Majoron self-interactions from Gravitational waves experiments | More technical details added. The conclusions are the same | null | 10.1088/1674-1137/42/2/023105 | null | hep-ph gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show how Majoron models may be tested/limited in gravitational waves
experiments. In particular, the Majoron self-interaction potential may induce a
first order phase transition, producing gravitational waves from bubble
collisions. We dubbed such a new scenario {\it violent Majoron model}, because
it would be associated to a violent phase transition in the early Universe.
Sphaleron constraints can be avoided if the global $U(1)_{B-L}$ is broken at
scales lower than the electroweak scale, provided that the B-L spontaneously
breaking scale is lower than $10\, {\rm TeV}$ in order to satisfy the
cosmological mass density bound. The possibility of a sub-electroweak phase
transition is practically unconstrained by cosmological bounds and it may be
detected within the sensitivity of next generation of gravitational waves
experiments: eLISA, DECIGO and BBO. We also comment on the possible detection
in CEPC collider, where Majorons's production can be observed from Higgs'
portals in missing transverse energy channels.
| [
{
"created": "Tue, 23 May 2017 15:05:24 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Nov 2017 06:29:25 GMT",
"version": "v2"
}
] | 2018-03-14 | [
[
"Addazi",
"Andrea",
""
],
[
"Marciano",
"Antonino",
""
]
] | We show how Majoron models may be tested/limited in gravitational waves experiments. In particular, the Majoron self-interaction potential may induce a first order phase transition, producing gravitational waves from bubble collisions. We dubbed such a new scenario {\it violent Majoron model}, because it would be associated to a violent phase transition in the early Universe. Sphaleron constraints can be avoided if the global $U(1)_{B-L}$ is broken at scales lower than the electroweak scale, provided that the B-L spontaneously breaking scale is lower than $10\, {\rm TeV}$ in order to satisfy the cosmological mass density bound. The possibility of a sub-electroweak phase transition is practically unconstrained by cosmological bounds and it may be detected within the sensitivity of next generation of gravitational waves experiments: eLISA, DECIGO and BBO. We also comment on the possible detection in CEPC collider, where Majorons's production can be observed from Higgs' portals in missing transverse energy channels. |
1611.02149 | Egle Tomasi-Gustafsson | Andrea Bianconi and Egle Tomasi-Gustafsson | The fourth dimension of the nucleon structure: spacetime analysis of the
timelike electromagnetic proton form factors | 8 figures, 15 pages | Phys. Rev. C 95, 015204 (2017) | 10.1103/PhysRevC.95.015204 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | As well known, spacelike proton form factors expressed in the Breit frame may
be interpreted as the Fourier transform of static space distributions of
electric charge and current. In particular, the electric form factor is simply
the Fourier transform of the charge distribution $F(q)=\int e^{i\vec q \cdot
\vec r} \rho(r)d^3r$. We don't have an intuitive interpretation of the same
level of simplicity for the proton timelike form factor appearing in the
reactions $e^+e^-\leftrightarrow \bar{p}p$. However, one may suggest that in
the center of mass (CM) frame, where $q_\mu x^\mu =qt$, a timelike electric
form factor is the Fourier transform $F(q) =\int e^{iqt} R(t)dt$ of a function
$R(t)$ expressing how the electric properties of the forming (or annihilating)
proton-antiproton pair evolve in time. Here we analyze in depth this idea, show
that the functions $\rho(r)$ and $R(t)$ can be formally written as the time and
space integrals of a unique correlation function depending on both time and
space coordinates.
| [
{
"created": "Mon, 7 Nov 2016 16:12:38 GMT",
"version": "v1"
}
] | 2017-01-18 | [
[
"Bianconi",
"Andrea",
""
],
[
"Tomasi-Gustafsson",
"Egle",
""
]
] | As well known, spacelike proton form factors expressed in the Breit frame may be interpreted as the Fourier transform of static space distributions of electric charge and current. In particular, the electric form factor is simply the Fourier transform of the charge distribution $F(q)=\int e^{i\vec q \cdot \vec r} \rho(r)d^3r$. We don't have an intuitive interpretation of the same level of simplicity for the proton timelike form factor appearing in the reactions $e^+e^-\leftrightarrow \bar{p}p$. However, one may suggest that in the center of mass (CM) frame, where $q_\mu x^\mu =qt$, a timelike electric form factor is the Fourier transform $F(q) =\int e^{iqt} R(t)dt$ of a function $R(t)$ expressing how the electric properties of the forming (or annihilating) proton-antiproton pair evolve in time. Here we analyze in depth this idea, show that the functions $\rho(r)$ and $R(t)$ can be formally written as the time and space integrals of a unique correlation function depending on both time and space coordinates. |
1204.0049 | Tom Steele | R. Berg, D. Harnett, R. T. Kleiv, T. G. Steele | Mass Predictions for Pseudoscalar $J^{PC}=0^{-+}$ Charmonium and
Bottomonium Hybrids in QCD Sum-Rules | 10 pages, 7 embedded figures. Analysis extended and refined in v2 | Phys. Rev. D86 (2012) 034002 | 10.1103/PhysRevD.86.034002 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Masses of the pseudoscalar $(J^{PC}=0^{-+})$ charmonium and bottomonium
hybrids are determined using QCD Laplace sum-rules. The effects of the
dimension-six gluon condensate are included in our analysis and result in a
stable sum-rule analysis, whereas previous studies of these states were unable
to optimize mass predictions. The pseudoscalar charmonium hybrid is predicted
to have a mass of approximately 3.8 GeV and the corresponding bottomonium
prediction is 10.6 GeV. Calculating the full correlation function, rather than
only the imaginary part, is shown to be necessary for accurate formulation of
the sum-rules. The charmonium hybrid mass prediction is discussed within the
context of the X Y Z resonances.
| [
{
"created": "Fri, 30 Mar 2012 23:51:02 GMT",
"version": "v1"
},
{
"created": "Wed, 23 May 2012 21:17:15 GMT",
"version": "v2"
}
] | 2013-01-17 | [
[
"Berg",
"R.",
""
],
[
"Harnett",
"D.",
""
],
[
"Kleiv",
"R. T.",
""
],
[
"Steele",
"T. G.",
""
]
] | Masses of the pseudoscalar $(J^{PC}=0^{-+})$ charmonium and bottomonium hybrids are determined using QCD Laplace sum-rules. The effects of the dimension-six gluon condensate are included in our analysis and result in a stable sum-rule analysis, whereas previous studies of these states were unable to optimize mass predictions. The pseudoscalar charmonium hybrid is predicted to have a mass of approximately 3.8 GeV and the corresponding bottomonium prediction is 10.6 GeV. Calculating the full correlation function, rather than only the imaginary part, is shown to be necessary for accurate formulation of the sum-rules. The charmonium hybrid mass prediction is discussed within the context of the X Y Z resonances. |
0912.3561 | Hai-Yang Cheng | Hai-Yang Cheng | Scalar and Pseudoscalar Glueballs Revisited | 5 pages, talk presented at the XIII International Conference on
Hadron Spectroscopy, November 29-December 4, 2009, Tallahassee, Florida | AIP Conf.Proc.1257:477-481,2010 | 10.1063/1.3483375 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using two simple and robust inputs to constrain the mixing matrix of the
isosinglet scalar mesons $f_0(1710)$, $f_0(1500)$, $f_0(1370)$, we have shown
that in the SU(3) symmetry limit, $f_0(1500)$ becomes a pure SU(3) octet and is
degenerate with $a_0(1450)$, while $f_0(1370)$ is mainly an SU(3) singlet with
a slight mixing with the scalar glueball which is the primary component of
$f_0(1710)$. These features remain essentially unchanged even when SU(3)
breaking is taken into account. We have deduced the mass of the pseudoscalar
glueball $G$ from an $\eta$-$\eta'$-$G$ mixing formalism based on the anomalous
Ward identity for transition matrix elements. With the inputs from the recent
KLOE experiment, we find a solution for the pseudoscalar glueball mass around
$(1.4\pm 0.1)$ GeV. This affirms that $\eta(1405)$, having a large production
rate in the radiative $J/\psi$ decay and not seen in $\gamma\gamma$ reactions,
is indeed a leading candidate for the pseudoscalar glueball. It is much lower
than the results from quenched lattice QCD ($>2.0$ GeV).
| [
{
"created": "Fri, 18 Dec 2009 02:06:37 GMT",
"version": "v1"
},
{
"created": "Sat, 19 Dec 2009 01:44:45 GMT",
"version": "v2"
}
] | 2014-11-20 | [
[
"Cheng",
"Hai-Yang",
""
]
] | Using two simple and robust inputs to constrain the mixing matrix of the isosinglet scalar mesons $f_0(1710)$, $f_0(1500)$, $f_0(1370)$, we have shown that in the SU(3) symmetry limit, $f_0(1500)$ becomes a pure SU(3) octet and is degenerate with $a_0(1450)$, while $f_0(1370)$ is mainly an SU(3) singlet with a slight mixing with the scalar glueball which is the primary component of $f_0(1710)$. These features remain essentially unchanged even when SU(3) breaking is taken into account. We have deduced the mass of the pseudoscalar glueball $G$ from an $\eta$-$\eta'$-$G$ mixing formalism based on the anomalous Ward identity for transition matrix elements. With the inputs from the recent KLOE experiment, we find a solution for the pseudoscalar glueball mass around $(1.4\pm 0.1)$ GeV. This affirms that $\eta(1405)$, having a large production rate in the radiative $J/\psi$ decay and not seen in $\gamma\gamma$ reactions, is indeed a leading candidate for the pseudoscalar glueball. It is much lower than the results from quenched lattice QCD ($>2.0$ GeV). |
0712.4134 | Brooks Thomas | Brooks Thomas | Theory and Phenomenology of Dirac Leptogenesis | PhD Thesis. 176 Pages, 27 figures. The material presented in chapter
5 is new and has not been previously published | null | null | null | hep-ph | null | Dirac leptogenesis, in which neutrinos are purely Dirac and develop small but
nonzero effective masses without the aid of the see-saw mechanism, provides an
interesting alternative to the standard leptogenesis picture. Here we review
the theory and phenomenology of Dirac leptogenesis and show that it is a viable
theory capable of simultaneously satisfying all relevant bounds from cosmology,
neutrino physics, and flavor violation. In addition, we also explore several
potential extensions of the model, such as the possibility of right-handed
sneutrino dark matter and the potential for relating the leptogenesis mechanism
to the origin of the mu-term. Theories with a heavy gravitino and gaugino
masses generated by anomaly mediation emerge as one natural context for Dirac
leptogenesis. In such models the lightest neutralino is often expected to be
predominately wino or Higgsino, and is a viable dark matter candidate. We
conclude with an examination of the prospects for detecting the effectively
monoenergetic photon signal that results from the annihilation of such a dark
matter particle in the galactic halo.
| [
{
"created": "Wed, 26 Dec 2007 20:48:19 GMT",
"version": "v1"
}
] | 2007-12-27 | [
[
"Thomas",
"Brooks",
""
]
] | Dirac leptogenesis, in which neutrinos are purely Dirac and develop small but nonzero effective masses without the aid of the see-saw mechanism, provides an interesting alternative to the standard leptogenesis picture. Here we review the theory and phenomenology of Dirac leptogenesis and show that it is a viable theory capable of simultaneously satisfying all relevant bounds from cosmology, neutrino physics, and flavor violation. In addition, we also explore several potential extensions of the model, such as the possibility of right-handed sneutrino dark matter and the potential for relating the leptogenesis mechanism to the origin of the mu-term. Theories with a heavy gravitino and gaugino masses generated by anomaly mediation emerge as one natural context for Dirac leptogenesis. In such models the lightest neutralino is often expected to be predominately wino or Higgsino, and is a viable dark matter candidate. We conclude with an examination of the prospects for detecting the effectively monoenergetic photon signal that results from the annihilation of such a dark matter particle in the galactic halo. |
hep-ph/9703313 | Rafel Escribano | A. Bramon, R. Escribano and M. D. Scadron | Mixing of eta-eta' Mesons in J/psi Decays into a Vector and a
Pseudoscalar Meson | 9 pages, LaTeX, full postscript file available via anonymous ftp at
ftp://ftp.ifae.es/preprint/ft/uabft412.ps | Phys.Lett. B403 (1997) 339-343 | 10.1016/S0370-2693(97)00508-X | UAB-FT/97-412 | hep-ph | null | The octet-singlet mixing angle $\theta_P$ in the pseudoscalar meson nonet is
deduced from the rich set of accurate data on $J/\psi$ decays into a vector and
a pseudoscalar meson. Corrections due to non-ideal $\omega$-$\phi$ mixing have
been included for the first time and turn out to be crucial to find $\theta_P =
-16.9 \pm 1.7$ degrees, which is appreciably less negative than previous
results coming from similar analyses.
| [
{
"created": "Thu, 13 Mar 1997 10:22:19 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Bramon",
"A.",
""
],
[
"Escribano",
"R.",
""
],
[
"Scadron",
"M. D.",
""
]
] | The octet-singlet mixing angle $\theta_P$ in the pseudoscalar meson nonet is deduced from the rich set of accurate data on $J/\psi$ decays into a vector and a pseudoscalar meson. Corrections due to non-ideal $\omega$-$\phi$ mixing have been included for the first time and turn out to be crucial to find $\theta_P = -16.9 \pm 1.7$ degrees, which is appreciably less negative than previous results coming from similar analyses. |
2010.03101 | Guilherme Peccini | G. M. Peccini, L. S. Moriggi and M. V. T. Machado | Dilepton production through timelike Compton scattering within the
$k_T$-factorization approach | 9 pages, 4 figures | Phys. Rev. D 102, 094015 (2020) | 10.1103/PhysRevD.102.094015 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we consider the dilepton production via timelike Compton
scattering (TCS) in electron-proton and proton-proton collisions. In
particular, the differential cross section in terms of the dilepton invariant
mass and rapidity is computed within the $k_T$-factorization approach. Besides,
we utilize distinct unintegrated gluon distributions (UGD) in order to compare
their impact on the differential cross section of TCS in $pp$ ($ep$) collisions
evaluated at the LHC (LHeC), HL-LHC (LHeC), HE-LHC (LHeC) and FCC-hh (eh)
center-of-mass energies.
| [
{
"created": "Wed, 7 Oct 2020 01:24:29 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Nov 2020 17:10:40 GMT",
"version": "v2"
}
] | 2020-11-30 | [
[
"Peccini",
"G. M.",
""
],
[
"Moriggi",
"L. S.",
""
],
[
"Machado",
"M. V. T.",
""
]
] | In this work we consider the dilepton production via timelike Compton scattering (TCS) in electron-proton and proton-proton collisions. In particular, the differential cross section in terms of the dilepton invariant mass and rapidity is computed within the $k_T$-factorization approach. Besides, we utilize distinct unintegrated gluon distributions (UGD) in order to compare their impact on the differential cross section of TCS in $pp$ ($ep$) collisions evaluated at the LHC (LHeC), HL-LHC (LHeC), HE-LHC (LHeC) and FCC-hh (eh) center-of-mass energies. |
hep-ph/0209002 | Y. Y. Keum | Yong-Yeon Keum | Determination of weak phases $\phi_2$ and $\phi_3$ from $B\to
\pi\pi,K\pi$ in the pQCD method | 6 pages, Latex, 3 figures, typos corrected. Presented at Workshop on
CKM Unitarity Triangle (CERN 2002-2003), Geneva, Switzerland, 13-16 Feb 2002 | null | null | DPNU-02-28 | hep-ph | null | We look at two methods to determine the weak phases $\phi_2$ and $\phi_3$
from $B \to \pi\pi$ and $K\pi$ decays within the perturbative QCD approach. We
obtain quite interesting bounds on $\phi_2$ and $\phi_3$ from recent
experimental measurements in asymmetric B-factory: $55^o \leq \phi_2 \leq
100^o$ and $51^o \leq \phi_3 \leq 129^o$. Specially we predict the possibility
of large direct CP violation effect in $B^0 \to \pi^{+}\pi^{-}$ decay with
$A_{cp}^{dir}(B\to \pi^{+} \pi^{-})=(23\pm7)$ %.
| [
{
"created": "Mon, 2 Sep 2002 17:00:58 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Sep 2002 13:52:16 GMT",
"version": "v2"
},
{
"created": "Wed, 18 Sep 2002 17:10:51 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Keum",
"Yong-Yeon",
""
]
] | We look at two methods to determine the weak phases $\phi_2$ and $\phi_3$ from $B \to \pi\pi$ and $K\pi$ decays within the perturbative QCD approach. We obtain quite interesting bounds on $\phi_2$ and $\phi_3$ from recent experimental measurements in asymmetric B-factory: $55^o \leq \phi_2 \leq 100^o$ and $51^o \leq \phi_3 \leq 129^o$. Specially we predict the possibility of large direct CP violation effect in $B^0 \to \pi^{+}\pi^{-}$ decay with $A_{cp}^{dir}(B\to \pi^{+} \pi^{-})=(23\pm7)$ %. |
hep-ph/9702443 | null | I.V. Musatov and A.V. Radyushkin | Transverse Momentum and Sudakov Effects in Exclusive QCD Processes:
gamma* gamma pi0 Form Factor | LaTeX, 34 pages, 4 figures; minor changes | Phys.Rev.D56:2713-2735,1997 | 10.1103/PhysRevD.56.2713 | JLAB-THY-97-07 | hep-ph | null | We analyze effects due to transverse degrees of freedom in QCD calculations
of the fundamental hard exclusive amplitude of $\gamma^*\gamma \to \pi^0$
transition. A detailed discussion is given of the relation between the modified
factorization approach (MFA) of Sterman et al. and standard factorization
(SFA). Working in Feynman gauge, we construct basic building blocks of MFA from
the one-loop coefficient function of the SFA, demonstrating that Sudakov
effects are distinctly different from higher-twist corrections. We show also
that the handbag-type diagram, contrary to naive expectations, does not contain
an infinite chain of $(M^2/Q^2)^n$ corrections: they come only from diagrams
with transverse gluons emitted from the hard propagator. A simpler picture
emerges within the QCD sum rule approach: the sum over soft $\bar q G ... G q$
Fock components is dual to $\bar qq$ states generated by the local axial
current. We combine the results based on QCD sum rules with pQCD radiative
corrections and observe that the gap between our curves for the asymptotic and
CZ distribution amplitudes is sufficiently large for an experimental
discrimination between them.
| [
{
"created": "Fri, 28 Feb 1997 00:54:43 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Feb 1997 01:17:48 GMT",
"version": "v2"
},
{
"created": "Mon, 10 Mar 1997 23:39:41 GMT",
"version": "v3"
}
] | 2014-11-17 | [
[
"Musatov",
"I. V.",
""
],
[
"Radyushkin",
"A. V.",
""
]
] | We analyze effects due to transverse degrees of freedom in QCD calculations of the fundamental hard exclusive amplitude of $\gamma^*\gamma \to \pi^0$ transition. A detailed discussion is given of the relation between the modified factorization approach (MFA) of Sterman et al. and standard factorization (SFA). Working in Feynman gauge, we construct basic building blocks of MFA from the one-loop coefficient function of the SFA, demonstrating that Sudakov effects are distinctly different from higher-twist corrections. We show also that the handbag-type diagram, contrary to naive expectations, does not contain an infinite chain of $(M^2/Q^2)^n$ corrections: they come only from diagrams with transverse gluons emitted from the hard propagator. A simpler picture emerges within the QCD sum rule approach: the sum over soft $\bar q G ... G q$ Fock components is dual to $\bar qq$ states generated by the local axial current. We combine the results based on QCD sum rules with pQCD radiative corrections and observe that the gap between our curves for the asymptotic and CZ distribution amplitudes is sufficiently large for an experimental discrimination between them. |
1005.0335 | Raquel Molina Ms. | R. Molina, T. Branz and E. Oset | A new interpretation for the $D^*_{s2}(2573)$ and the prediction of
novel exotic charmed mesons | null | Phys.Rev.D82:014010,2010 | 10.1103/PhysRevD.82.014010 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this manuscript we study the vector - vector interaction within the hidden
gauge formalism in a coupled channel unitary approach. In the sector
$C=1,S=1,J=2$ we get a pole in the T-matrix around $2572$ MeV that we identify
with the $D^*_{s2}(2573)$, coupling strongly to the
$D^*K^*$($D^*_s\phi$($\omega$)) channels. In addition we obtain resonances in
other exotic sectors which have not been studied before such as $C=1,S=-1$,
$C=2,S=0$ and $C=2,S=1$. This 'flavor-exotic' states are interpreted as
$D^*\bar{K^*}$, $D^*D^*$ and $D^*_sD^*$ molecular states but have not been
observed yet. In total we obtain nine states with different spin, isospin,
charm and strangeness of non $C=0,S=0$ and $C=1,S=0$ character, which have been
reported before.
| [
{
"created": "Mon, 3 May 2010 16:24:29 GMT",
"version": "v1"
}
] | 2014-11-20 | [
[
"Molina",
"R.",
""
],
[
"Branz",
"T.",
""
],
[
"Oset",
"E.",
""
]
] | In this manuscript we study the vector - vector interaction within the hidden gauge formalism in a coupled channel unitary approach. In the sector $C=1,S=1,J=2$ we get a pole in the T-matrix around $2572$ MeV that we identify with the $D^*_{s2}(2573)$, coupling strongly to the $D^*K^*$($D^*_s\phi$($\omega$)) channels. In addition we obtain resonances in other exotic sectors which have not been studied before such as $C=1,S=-1$, $C=2,S=0$ and $C=2,S=1$. This 'flavor-exotic' states are interpreted as $D^*\bar{K^*}$, $D^*D^*$ and $D^*_sD^*$ molecular states but have not been observed yet. In total we obtain nine states with different spin, isospin, charm and strangeness of non $C=0,S=0$ and $C=1,S=0$ character, which have been reported before. |
1206.1327 | Filippo Sala | Riccardo Barbieri, Dario Buttazzo, Filippo Sala, David M. Straub | Less Minimal Flavour Violation | 15 pages, 1 figure | null | 10.1007/JHEP10(2012)040 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the approximate U(2)^3 flavour symmetry exhibited by the quark
sector of the Standard Model and all its possible breaking terms appearing in
the quark Yukawa couplings. Taking an Effective Field Theory point of view, we
determine the current bounds on these parameters, assumed to control the
breaking of flavour in a generic extension of the Standard Model at a reference
scale Lambda. In particular, a significant bound from epsilon'/epsilon is
derived, which is relevant to Minimal Flavour Violation as well. In the
up-quark sector, the recently observed CP violation in D -> pi+ pi-, K+ K-
decays might be accounted for in this generic framework, consistently with any
other constraint.
| [
{
"created": "Wed, 6 Jun 2012 20:00:13 GMT",
"version": "v1"
}
] | 2015-06-05 | [
[
"Barbieri",
"Riccardo",
""
],
[
"Buttazzo",
"Dario",
""
],
[
"Sala",
"Filippo",
""
],
[
"Straub",
"David M.",
""
]
] | We consider the approximate U(2)^3 flavour symmetry exhibited by the quark sector of the Standard Model and all its possible breaking terms appearing in the quark Yukawa couplings. Taking an Effective Field Theory point of view, we determine the current bounds on these parameters, assumed to control the breaking of flavour in a generic extension of the Standard Model at a reference scale Lambda. In particular, a significant bound from epsilon'/epsilon is derived, which is relevant to Minimal Flavour Violation as well. In the up-quark sector, the recently observed CP violation in D -> pi+ pi-, K+ K- decays might be accounted for in this generic framework, consistently with any other constraint. |
2109.12920 | Giovanni Pierobon | Zhe Chen, Archil Kobakhidze, Ciaran A. J. O'Hare, Zachary S. C.
Picker, Giovanni Pierobon | Phenomenology of the companion-axion model: photon couplings | null | Eur.Phys.J.C 82 (2022) 10, 940 | 10.1140/epjc/s10052-022-10909-6 | null | hep-ph astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the phenomenology of the 'companion-axion model' consisting of two
coupled QCD axions. The second axion is required to rescue the Peccei-Quinn
solution to the strong-CP problem from the effects of colored gravitational
instantons. We investigate here the combined phenomenology of axion-axion and
axion-photon interactions, recasting present and future single-axion bounds
onto the companion-axion parameter space. Most remarkably, we predict that
future axion searches with haloscopes and helioscopes may well discover two QCD
axions, perhaps even within the same experiment.
| [
{
"created": "Mon, 27 Sep 2021 10:08:38 GMT",
"version": "v1"
}
] | 2022-10-27 | [
[
"Chen",
"Zhe",
""
],
[
"Kobakhidze",
"Archil",
""
],
[
"O'Hare",
"Ciaran A. J.",
""
],
[
"Picker",
"Zachary S. C.",
""
],
[
"Pierobon",
"Giovanni",
""
]
] | We study the phenomenology of the 'companion-axion model' consisting of two coupled QCD axions. The second axion is required to rescue the Peccei-Quinn solution to the strong-CP problem from the effects of colored gravitational instantons. We investigate here the combined phenomenology of axion-axion and axion-photon interactions, recasting present and future single-axion bounds onto the companion-axion parameter space. Most remarkably, we predict that future axion searches with haloscopes and helioscopes may well discover two QCD axions, perhaps even within the same experiment. |
1107.2588 | Christian Fischer | Tobias Goecke, Christian S. Fischer and Richard Williams | Leading-order calculation of hadronic contributions to the muon $g-2$
using the Dyson-Schwinger approach | 9 pages, 8 figures | Phys.Lett.B704:211-217,2011 | 10.1016/j.physletb.2011.09.019 | null | hep-ph hep-lat nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a calculation of the hadronic vacuum polarization (HVP) tensor
within the framework of Dyson--Schwinger equations. To this end we use a
well-established phenomenological model for the quark-gluon interaction with
parameters fixed to reproduce hadronic observables. From the HVP tensor we
compute both the Adler function and the HVP contribution to the anomalous
magnetic moment of the muon, $a_\mu$. We find $a_\mu^{HVP}= 6760\times
10^{-11}$ which deviates about two percent from the value extracted from
experiment. Additionally, we make comparison with a recent lattice
determination of $a_\mu^{HVP}$ and find good agreement within our approach. We
also discuss the implications of our result for a corresponding calculation of
the hadronic light-by-light scattering contribution to $a_\mu$.
| [
{
"created": "Wed, 13 Jul 2011 16:25:50 GMT",
"version": "v1"
}
] | 2011-09-28 | [
[
"Goecke",
"Tobias",
""
],
[
"Fischer",
"Christian S.",
""
],
[
"Williams",
"Richard",
""
]
] | We present a calculation of the hadronic vacuum polarization (HVP) tensor within the framework of Dyson--Schwinger equations. To this end we use a well-established phenomenological model for the quark-gluon interaction with parameters fixed to reproduce hadronic observables. From the HVP tensor we compute both the Adler function and the HVP contribution to the anomalous magnetic moment of the muon, $a_\mu$. We find $a_\mu^{HVP}= 6760\times 10^{-11}$ which deviates about two percent from the value extracted from experiment. Additionally, we make comparison with a recent lattice determination of $a_\mu^{HVP}$ and find good agreement within our approach. We also discuss the implications of our result for a corresponding calculation of the hadronic light-by-light scattering contribution to $a_\mu$. |
1209.1202 | Danning Li | Danning Li, Mei Huang, and Qi-Shu Yan | Accommodate chiral symmetry breaking and linear confinement in a
dynamical holographic QCD model | Proccedings of QCD@Work,International Workshop on QCD, theoretical
and experimental,Lecce(Italy), June 18-21,2012, 7 pages | null | 10.1063/1.4763523 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct a self-consistent holographic QCD model which can realize two
most important phenomena of QCD, i.e. chiral symmetry breaking and confinement.
The model is formulated in the framework of graviton-dilaton-scalar system,
where the dilaton field is of dimension-2 which might be dual to the
dimension-2 gluon condensate and can lead to the linear confinement, while the
scalar field corresponds to the quark anti-quark condensate and can explain the
property of chiral dynamics. Within this framework, both Regge spectra of
hadrons and the linear potential between quarks can be accommodated. It is also
found that the negative dilaton background can be safely excluded in this
framework.
| [
{
"created": "Thu, 6 Sep 2012 07:29:33 GMT",
"version": "v1"
}
] | 2015-06-11 | [
[
"Li",
"Danning",
""
],
[
"Huang",
"Mei",
""
],
[
"Yan",
"Qi-Shu",
""
]
] | We construct a self-consistent holographic QCD model which can realize two most important phenomena of QCD, i.e. chiral symmetry breaking and confinement. The model is formulated in the framework of graviton-dilaton-scalar system, where the dilaton field is of dimension-2 which might be dual to the dimension-2 gluon condensate and can lead to the linear confinement, while the scalar field corresponds to the quark anti-quark condensate and can explain the property of chiral dynamics. Within this framework, both Regge spectra of hadrons and the linear potential between quarks can be accommodated. It is also found that the negative dilaton background can be safely excluded in this framework. |
2312.13582 | Zanpeng Yin | Zanpeng Yin, Daisuke Jido | A Possible Solution to the Difficulty in the Interpretation of Deuteron
Compositeness | 16 pages | null | null | null | hep-ph nucl-th | http://creativecommons.org/licenses/by-nc-nd/4.0/ | We study the theoretical structure of compositeness with explicit energy
dependence, and find a possible explanation for the difficulty in the
interpretation of compositeness of deuteron. Compositeness of deuteron is
calculated as larger than one in many methods like weak-binding limit. Even
though it is widely assumed that the energy dependence in interaction always
comes from other states, which we call surjective interpretation, we find that
the outcome of deuteron may suggest a violation of surjective interpretation.
We directly perform numerical and perturbative calculations of deuteron
compositeness. It is concluded that if the energy dependent part of interaction
contributes to attraction, compositeness is likely to be enhanced from unity.
We discuss the indications of this outcome and the model dependence of
compositeness. We propose a straightforward extension and a thorough revise on
the formalism of compositeness with field theory considerations.
| [
{
"created": "Thu, 21 Dec 2023 05:16:32 GMT",
"version": "v1"
},
{
"created": "Fri, 5 Apr 2024 12:36:12 GMT",
"version": "v2"
}
] | 2024-04-08 | [
[
"Yin",
"Zanpeng",
""
],
[
"Jido",
"Daisuke",
""
]
] | We study the theoretical structure of compositeness with explicit energy dependence, and find a possible explanation for the difficulty in the interpretation of compositeness of deuteron. Compositeness of deuteron is calculated as larger than one in many methods like weak-binding limit. Even though it is widely assumed that the energy dependence in interaction always comes from other states, which we call surjective interpretation, we find that the outcome of deuteron may suggest a violation of surjective interpretation. We directly perform numerical and perturbative calculations of deuteron compositeness. It is concluded that if the energy dependent part of interaction contributes to attraction, compositeness is likely to be enhanced from unity. We discuss the indications of this outcome and the model dependence of compositeness. We propose a straightforward extension and a thorough revise on the formalism of compositeness with field theory considerations. |
1108.0533 | Valery Lyubovitskij | Valery E. Lyubovitskij, Thomas Gutsche, Ivan Schmidt, Alfredo Vega | Mesons and baryons in the holographic soft-wall model | 4 pages, Presented by Valery E. Lyubovitskij at the XIV International
Conference on Hadron Spectroscopy, 13-17 June 2011, Munich, Germany | eConf C110613: 511, 2011 | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Mesons and baryons are considered in soft-wall holographic approach based on
the correspondence of string theory in AdS space and conformal field theory in
physical space-time. The model generates Regge trajectories linear in n and J
(L) for the hadronic mass spectrum. Results obtained for heavy-light meson
masses and decay constants are consistent with predictions of HQET. In the
baryon sector applications to the nucleon electromagnetic form factors and
generalized parton distributions are discussed.
| [
{
"created": "Tue, 2 Aug 2011 10:07:43 GMT",
"version": "v1"
}
] | 2012-04-24 | [
[
"Lyubovitskij",
"Valery E.",
""
],
[
"Gutsche",
"Thomas",
""
],
[
"Schmidt",
"Ivan",
""
],
[
"Vega",
"Alfredo",
""
]
] | Mesons and baryons are considered in soft-wall holographic approach based on the correspondence of string theory in AdS space and conformal field theory in physical space-time. The model generates Regge trajectories linear in n and J (L) for the hadronic mass spectrum. Results obtained for heavy-light meson masses and decay constants are consistent with predictions of HQET. In the baryon sector applications to the nucleon electromagnetic form factors and generalized parton distributions are discussed. |
0809.1073 | Monika Blanke | Monika Blanke, Andrzej J. Buras, Bjoern Duling, Stefania Gori and
Andreas Weiler | Delta F=2 Observables and Fine-Tuning in a Warped Extra Dimension with
Custodial Protection | 51 pages, 14 figures, 4 tables. v2: Discussion of Higgs FCNCs added,
discussion of protection of Z couplings extended, some comments added,
conclusions unchanged. v3: layout problem fixed | JHEP 0903:001,2009 | 10.1088/1126-6708/2009/03/001 | TUM-HEP-698/08, MPP-2008-115 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a complete study of Delta S = 2 and Delta B = 2 processes in a
warped extra dimensional model with a custodial protection of Z b_L bar b_L,
including epsilon_K, Delta M_K, Delta M_s, Delta M_d, A^q_SL, Delta Gamma_q,
A_CP(B_d -> psi K_S) and A_CP(B_s -> psi phi). These processes are affected by
tree level contributions from Kaluza-Klein gluons, the heavy KK photon, new
heavy electroweak gauge bosons Z_H and Z', and in principle by tree level Z
contributions. We confirm recent findings that the fully anarchic approach
where all the hierarchies in quark masses and weak mixing angles are
geometrically explained seems implausible and we confirm that the KK mass scale
M_KK generically has to be at least ~20TeV to satisfy the epsilon_K constraint.
We point out, however, that there exist regions in parameter space with only
modest fine-tuning in the 5D Yukawa couplings which satisfy all existing Delta
F = 2 and electroweak precision constraints for scales M_KK ~3TeV in reach of
the LHC. Simultaneously we find that A_CP(B_s -> psi phi) and A^s_SL can be
much larger than in the SM as indicated by recent results from CDF and D0 data.
We point out that for B_{d,s} physics Delta F = 2 observables the complex
(Z_H,Z') can compete with KK gluons, while the tree level Z and KK photon
contributions are very small. In particular we point out that the Z d^i_L bar
d^j_L couplings are protected by the custodial symmetry. As a by-product we
show the relation of the RS flavour model to the Froggatt-Nielsen mechanism and
we provide analytic formulae for the effective flavour mixing matrices in terms
of the fundamental 5D parameters.
| [
{
"created": "Fri, 5 Sep 2008 16:40:53 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Dec 2008 12:15:10 GMT",
"version": "v2"
},
{
"created": "Tue, 23 Dec 2008 10:38:43 GMT",
"version": "v3"
}
] | 2009-03-27 | [
[
"Blanke",
"Monika",
""
],
[
"Buras",
"Andrzej J.",
""
],
[
"Duling",
"Bjoern",
""
],
[
"Gori",
"Stefania",
""
],
[
"Weiler",
"Andreas",
""
]
] | We present a complete study of Delta S = 2 and Delta B = 2 processes in a warped extra dimensional model with a custodial protection of Z b_L bar b_L, including epsilon_K, Delta M_K, Delta M_s, Delta M_d, A^q_SL, Delta Gamma_q, A_CP(B_d -> psi K_S) and A_CP(B_s -> psi phi). These processes are affected by tree level contributions from Kaluza-Klein gluons, the heavy KK photon, new heavy electroweak gauge bosons Z_H and Z', and in principle by tree level Z contributions. We confirm recent findings that the fully anarchic approach where all the hierarchies in quark masses and weak mixing angles are geometrically explained seems implausible and we confirm that the KK mass scale M_KK generically has to be at least ~20TeV to satisfy the epsilon_K constraint. We point out, however, that there exist regions in parameter space with only modest fine-tuning in the 5D Yukawa couplings which satisfy all existing Delta F = 2 and electroweak precision constraints for scales M_KK ~3TeV in reach of the LHC. Simultaneously we find that A_CP(B_s -> psi phi) and A^s_SL can be much larger than in the SM as indicated by recent results from CDF and D0 data. We point out that for B_{d,s} physics Delta F = 2 observables the complex (Z_H,Z') can compete with KK gluons, while the tree level Z and KK photon contributions are very small. In particular we point out that the Z d^i_L bar d^j_L couplings are protected by the custodial symmetry. As a by-product we show the relation of the RS flavour model to the Froggatt-Nielsen mechanism and we provide analytic formulae for the effective flavour mixing matrices in terms of the fundamental 5D parameters. |
1402.3971 | Volodymyr Magas | V.K. Magas, A. Feijoo, A. Ramos | The $\bar{K} N \rightarrow K \Xi$ reaction in coupled channel chiral
models up to next-to-leading order | 8 pages, 4 figures, presented at the II Russian-Spanish Congress
"Particle and Nuclear Physics at all Scales and Cosmology", Saint-Petersburg,
October 1-4, 2013. arXiv admin note: text overlap with arXiv:1311.5025; and
with arXiv:hep-ph/0505239 by other authors | null | 10.1063/1.4891135 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the meson-baryon interaction in S-wave in the strangeness S=-1
sector using a chiral unitary approach based on a next-to-leading order chiral
SU(3) Lagrangian. We fit our model to the large set of experimental data in
different two-body channels. We pay particular attention to the $\bar{K} N
\rightarrow K \Xi$ reaction, where the effect of the next-to-leading order
terms in the Lagrangian are sufficiently large to be observed, since at tree
level the cross section of this reaction is zero. For these channels we improve
our approach by phenomenologically taking into account effects of the high spin
hyperonic resonances.
| [
{
"created": "Mon, 17 Feb 2014 11:40:00 GMT",
"version": "v1"
}
] | 2015-06-18 | [
[
"Magas",
"V. K.",
""
],
[
"Feijoo",
"A.",
""
],
[
"Ramos",
"A.",
""
]
] | We study the meson-baryon interaction in S-wave in the strangeness S=-1 sector using a chiral unitary approach based on a next-to-leading order chiral SU(3) Lagrangian. We fit our model to the large set of experimental data in different two-body channels. We pay particular attention to the $\bar{K} N \rightarrow K \Xi$ reaction, where the effect of the next-to-leading order terms in the Lagrangian are sufficiently large to be observed, since at tree level the cross section of this reaction is zero. For these channels we improve our approach by phenomenologically taking into account effects of the high spin hyperonic resonances. |
hep-ph/0307081 | Yosef Nir | Yuval Grossman, Tamar Kashti, Yosef Nir and Esteban Roulet | Leptogenesis from Supersymmetry Breaking | 4 pages; An improved discussion of the relevant numerical range of
the soft breaking terms (in agreement with hep-ph/0308031) | Phys.Rev.Lett.91:251801,2003 | 10.1103/PhysRevLett.91.251801 | WIS/17/03-Jul-DPP | hep-ph | null | We show that soft supersymmetry breaking terms involving the heavy sneutrinos
can lead to sneutrino-antisneutrino mixing and to new sources of CP violation,
which are present even if a single generation is considered. These terms are
naturally present in supersymmetric versions of leptogenesis scenarios, and
they induce indirect CP violation in the decays of the heavy sneutrinos,
eventually generating a baryon asymmetry. This new contribution can be
comparable to or even dominate over the asymmetry produced in traditional
leptogenesis scenarios.
| [
{
"created": "Mon, 7 Jul 2003 06:46:22 GMT",
"version": "v1"
},
{
"created": "Sun, 17 Aug 2003 17:54:51 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Grossman",
"Yuval",
""
],
[
"Kashti",
"Tamar",
""
],
[
"Nir",
"Yosef",
""
],
[
"Roulet",
"Esteban",
""
]
] | We show that soft supersymmetry breaking terms involving the heavy sneutrinos can lead to sneutrino-antisneutrino mixing and to new sources of CP violation, which are present even if a single generation is considered. These terms are naturally present in supersymmetric versions of leptogenesis scenarios, and they induce indirect CP violation in the decays of the heavy sneutrinos, eventually generating a baryon asymmetry. This new contribution can be comparable to or even dominate over the asymmetry produced in traditional leptogenesis scenarios. |
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