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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0706.1521
|
Kalpana Bora
|
Kalpana Bora
|
$\nu$ masses in a SUSY SO(10) theory with spontaneous CP violation
|
4 pages
|
Indian Jr. of Phys, vol 82(6), p 753-59 (2008)
| null | null |
hep-ph
| null |
We propose a possibility of spontaneous CP-violation (SCPV) at high scale in
a SUSY SO(10) theory. The model is L-R symmetric SUSY SO(10) with
\textbf{\noun{10}} and \textbf{126} dimensional Higgs generating fermion
masses, and the CP phase is generated through complex VEV of B-L breaking
\textbf{126} Higgs . The model can have potential application in explaining
$\nu$ masses and leptogenesis as well.
|
[
{
"created": "Mon, 11 Jun 2007 17:23:26 GMT",
"version": "v1"
}
] |
2014-07-28
|
[
[
"Bora",
"Kalpana",
""
]
] |
We propose a possibility of spontaneous CP-violation (SCPV) at high scale in a SUSY SO(10) theory. The model is L-R symmetric SUSY SO(10) with \textbf{\noun{10}} and \textbf{126} dimensional Higgs generating fermion masses, and the CP phase is generated through complex VEV of B-L breaking \textbf{126} Higgs . The model can have potential application in explaining $\nu$ masses and leptogenesis as well.
|
2107.12310
|
Xin-Qiang Li
|
Feng-Zhi Chen, Xin-Qiang Li, Shi-Can Peng, Ya-Dong Yang, and Hong-Hao
Zhang
|
$CP$ asymmetry in the angular distributions of $\tau\to K_S\pi\nu_\tau$
decays -- II: general effective field theory analysis
|
36 pages, 2 tables, and 6 figures; bounds on the NP parameters from
other processes together with more discussions and references added, final
version to be published in JHEP
| null |
10.1007/JHEP01(2022)108
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We proceed to study the $CP$ asymmetry in the angular distributions of
$\tau\to K_S\pi\nu_\tau$ decays within a general effective field theory
framework including four-fermion operators up to dimension-six. It is found
that, besides the commonly considered scalar-vector interference, the
tensor-scalar interference can also produce a non-zero $CP$ asymmetry in the
angular distributions. Bounds on the effective couplings of the non-standard
scalar and tensor interactions are obtained under the combined constraints from
the measured $CP$ asymmetries and the branching ratio of $\tau^-\to
K_S\pi^-\nu_\tau$ decay, with $\mathrm{Im}[\hat{\epsilon}_S]=-0.008\pm0.027$
and $\mathrm{Im}[\hat{\epsilon}_T]=0.03\pm0.12$, at the scale
$\mu_\tau=2~\mathrm{GeV}$ in the $\mathrm{\overline{MS}}$ scheme. Using the
best-fit values, we also find that the distributions of the $CP$ asymmetries
can deviate significantly from the SM expectation in almost the whole $K\pi$
invariant-mass region. Nevertheless, the current bounds are still plagued by
large experimental uncertainties, but will be improved with more precise
measurements from Belle II as well as the proposed Tera-Z and STCF facilities.
Assuming further that the non-standard scalar and tensor interactions originate
from a weakly-coupled heavy new physics well above the electroweak scale, the
$SU(2)_L$ invariance of the resulting SMEFT Lagrangian would indicate that very
strong limits on $\mathrm{Im}[\hat{\epsilon}_S]$ and
$\mathrm{Im}[\hat{\epsilon}_T]$ could also be obtained from the neutron
electric dipole moment and the $D^0-\bar{D}^0$ mixing. With the bounds from
these processes taken into account, it is then found that, unless there exist
extraordinary cancellations between the new physics contributions, neither the
scalar nor the tensor interaction can produce any significant effects on the
$CP$ asymmetries in the processes considered.
|
[
{
"created": "Mon, 26 Jul 2021 16:31:34 GMT",
"version": "v1"
},
{
"created": "Mon, 17 Jan 2022 11:33:50 GMT",
"version": "v2"
}
] |
2022-02-09
|
[
[
"Chen",
"Feng-Zhi",
""
],
[
"Li",
"Xin-Qiang",
""
],
[
"Peng",
"Shi-Can",
""
],
[
"Yang",
"Ya-Dong",
""
],
[
"Zhang",
"Hong-Hao",
""
]
] |
We proceed to study the $CP$ asymmetry in the angular distributions of $\tau\to K_S\pi\nu_\tau$ decays within a general effective field theory framework including four-fermion operators up to dimension-six. It is found that, besides the commonly considered scalar-vector interference, the tensor-scalar interference can also produce a non-zero $CP$ asymmetry in the angular distributions. Bounds on the effective couplings of the non-standard scalar and tensor interactions are obtained under the combined constraints from the measured $CP$ asymmetries and the branching ratio of $\tau^-\to K_S\pi^-\nu_\tau$ decay, with $\mathrm{Im}[\hat{\epsilon}_S]=-0.008\pm0.027$ and $\mathrm{Im}[\hat{\epsilon}_T]=0.03\pm0.12$, at the scale $\mu_\tau=2~\mathrm{GeV}$ in the $\mathrm{\overline{MS}}$ scheme. Using the best-fit values, we also find that the distributions of the $CP$ asymmetries can deviate significantly from the SM expectation in almost the whole $K\pi$ invariant-mass region. Nevertheless, the current bounds are still plagued by large experimental uncertainties, but will be improved with more precise measurements from Belle II as well as the proposed Tera-Z and STCF facilities. Assuming further that the non-standard scalar and tensor interactions originate from a weakly-coupled heavy new physics well above the electroweak scale, the $SU(2)_L$ invariance of the resulting SMEFT Lagrangian would indicate that very strong limits on $\mathrm{Im}[\hat{\epsilon}_S]$ and $\mathrm{Im}[\hat{\epsilon}_T]$ could also be obtained from the neutron electric dipole moment and the $D^0-\bar{D}^0$ mixing. With the bounds from these processes taken into account, it is then found that, unless there exist extraordinary cancellations between the new physics contributions, neither the scalar nor the tensor interaction can produce any significant effects on the $CP$ asymmetries in the processes considered.
|
hep-ph/9703214
|
Kari Enqvist
|
Per Elmfors (Stockholm), Kari Enqvist (Helsinki), Georg Raffelt
(M\"unich), G\"unter Sigl (Chicago)
|
Neutrinos with Magnetic Moment: Depolarization Rate in Plasma
|
22 pages, LaTeX, 1 ps figure included; updated version, with a few
new references added
|
Nucl.Phys.B503:3-23,1997
|
10.1016/S0550-3213(97)00382-9
| null |
hep-ph astro-ph
| null |
Neutrinos with a magnetic moment $\mu$ change their helicity when interacting
with an electromagnetic field. Various aspects of this effect have been
described as spin precession, spin-flip scattering, and magnetic Cherenkov
radiation. These perspectives are unified in an expression for the
$\nu_L\to\nu_R$ transition rate which involves the correlators of the
electromagnetic field distribution. Our general formula corrects a previous
result and generalizes it to the case where the fields cannot be viewed as
classical and where the momentum transfers need not be small. We evaluate our
result explicitly for a relativistic QED plasma and determine the
depolarization rate to leading order in the fine structure constant. Assuming
that big-bang nucleosynthesis constraints do not allow a right-handed neutrino
in equilibrium we derive the limit $\mu<6.2\EE{-11}\mu_B$ on the neutrino
magnetic moment. Bounds on $\mu$ from a possible large scale magnetic fields
are found to be more stringent even for very weak fields
|
[
{
"created": "Mon, 3 Mar 1997 09:20:53 GMT",
"version": "v1"
},
{
"created": "Fri, 25 Jul 1997 08:24:11 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Elmfors",
"Per",
"",
"Stockholm"
],
[
"Enqvist",
"Kari",
"",
"Helsinki"
],
[
"Raffelt",
"Georg",
"",
"Münich"
],
[
"Sigl",
"Günter",
"",
"Chicago"
]
] |
Neutrinos with a magnetic moment $\mu$ change their helicity when interacting with an electromagnetic field. Various aspects of this effect have been described as spin precession, spin-flip scattering, and magnetic Cherenkov radiation. These perspectives are unified in an expression for the $\nu_L\to\nu_R$ transition rate which involves the correlators of the electromagnetic field distribution. Our general formula corrects a previous result and generalizes it to the case where the fields cannot be viewed as classical and where the momentum transfers need not be small. We evaluate our result explicitly for a relativistic QED plasma and determine the depolarization rate to leading order in the fine structure constant. Assuming that big-bang nucleosynthesis constraints do not allow a right-handed neutrino in equilibrium we derive the limit $\mu<6.2\EE{-11}\mu_B$ on the neutrino magnetic moment. Bounds on $\mu$ from a possible large scale magnetic fields are found to be more stringent even for very weak fields
|
hep-ph/0304052
|
Marek Gazdzicki
|
M. Gazdzicki, M. I. Gorenstein and St Mrowczynski
|
Fluctuations and Deconfinement Phase Transition in Nucleus-Nucleus
Collisions
|
revised version to be published in Phys. Lett. B
|
Phys.Lett. B585 (2004) 115-121
|
10.1016/j.physletb.2004.01.077
| null |
hep-ph
| null |
We propose a method to experimentally study the equation of state of strongly
interacting matter created at the early stage of nucleus--nucleus collisions.
The method exploits the relation between relative entropy and energy
fluctuations and equation of state. As a measurable quantity, the ratio of
properly filtered multiplicity to energy fluctuations is proposed. Within a
statistical approach to the early stage of nucleus-nucleus collisions, the
fluctuation ratio manifests a non--monotonic collision energy dependence with a
maximum in the domain where the onset of deconfinement occurs.
|
[
{
"created": "Fri, 4 Apr 2003 16:33:07 GMT",
"version": "v1"
},
{
"created": "Fri, 9 May 2003 14:50:33 GMT",
"version": "v2"
},
{
"created": "Thu, 16 Oct 2003 10:39:14 GMT",
"version": "v3"
},
{
"created": "Mon, 16 Feb 2004 13:47:32 GMT",
"version": "v4"
}
] |
2009-11-10
|
[
[
"Gazdzicki",
"M.",
""
],
[
"Gorenstein",
"M. I.",
""
],
[
"Mrowczynski",
"St",
""
]
] |
We propose a method to experimentally study the equation of state of strongly interacting matter created at the early stage of nucleus--nucleus collisions. The method exploits the relation between relative entropy and energy fluctuations and equation of state. As a measurable quantity, the ratio of properly filtered multiplicity to energy fluctuations is proposed. Within a statistical approach to the early stage of nucleus-nucleus collisions, the fluctuation ratio manifests a non--monotonic collision energy dependence with a maximum in the domain where the onset of deconfinement occurs.
|
2212.08447
|
Bo Wang
|
Bo Wang, Lu Meng
|
Revisiting the $DD^\ast$ chiral interactions with the local
momentum-space regularization up to the third order and the nature of
$T_{cc}^+$
|
15 pages, 6 figures, and 2 tables
|
Phys. Rev. D 107, 094002 (2023)
|
10.1103/PhysRevD.107.094002
| null |
hep-ph nucl-th
|
http://creativecommons.org/licenses/by/4.0/
|
We revisit the $DD^\ast$ interactions in chiral effective field theory up to
the third order for the first time. We deal with the pion-exchanged
interactions via local momentum-space regularization, in which we focus on
their long-range behaviors through demanding their contributions vanish at the
origin in the coordinate space. The short-range contact interactions and
subleading pion-charmed meson couplings are estimated with the phenomenological
resonance saturation model. The subleading pion-charmed meson couplings are
much weaker than those in the pion-nucleon system, thus the $DD^\ast$ binding
mechanism is very different with that of the $NN$ system. We also obtain the
analytic structure of the two-pion exchange interactions in the coordinate
space, and we find that its asymptotic behavior at long distance is similar to
but slightly different with the $NN$ interactions. We get the same asymptotic
behavior of the two-pion exchange interaction with that from HAL QCD method but
appearing in the longer distance rather than $1 <r<2\text{ fm}$. The binding
solution only exists in the isoscalar channel. Our calculation supports the
molecular interpretation of $T_{cc}^+$.
|
[
{
"created": "Fri, 16 Dec 2022 12:45:47 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Apr 2023 02:10:33 GMT",
"version": "v2"
}
] |
2023-05-05
|
[
[
"Wang",
"Bo",
""
],
[
"Meng",
"Lu",
""
]
] |
We revisit the $DD^\ast$ interactions in chiral effective field theory up to the third order for the first time. We deal with the pion-exchanged interactions via local momentum-space regularization, in which we focus on their long-range behaviors through demanding their contributions vanish at the origin in the coordinate space. The short-range contact interactions and subleading pion-charmed meson couplings are estimated with the phenomenological resonance saturation model. The subleading pion-charmed meson couplings are much weaker than those in the pion-nucleon system, thus the $DD^\ast$ binding mechanism is very different with that of the $NN$ system. We also obtain the analytic structure of the two-pion exchange interactions in the coordinate space, and we find that its asymptotic behavior at long distance is similar to but slightly different with the $NN$ interactions. We get the same asymptotic behavior of the two-pion exchange interaction with that from HAL QCD method but appearing in the longer distance rather than $1 <r<2\text{ fm}$. The binding solution only exists in the isoscalar channel. Our calculation supports the molecular interpretation of $T_{cc}^+$.
|
2204.06496
|
Jorge J. Mart\'inez de Lejarza
|
Jorge J. Mart\'inez de Lejarza, Leandro Cieri, Germ\'an Rodrigo
|
Quantum clustering and jet reconstruction at the LHC
|
24 pages, 17 figures, 2 tables
|
Physical Review D 106, 036021 (2022)
|
10.1103/PhysRevD.106.036021
|
IFIC/22-14 FTUV-22-0413.2034
|
hep-ph hep-ex quant-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Clustering is one of the most frequent problems in many domains, in
particular, in particle physics where jet reconstruction is central in
experimental analyses. Jet clustering at the CERN's Large Hadron Collider (LHC)
is computationally expensive and the difficulty of this task will increase with
the upcoming High-Luminosity LHC (HL-LHC). In this paper, we study the case in
which quantum computing algorithms might improve jet clustering by considering
two novel quantum algorithms which may speed up the classical jet clustering
algorithms. The first one is a quantum subroutine to compute a Minkowski-based
distance between two data points, whereas the second one consists of a quantum
circuit to track the maximum into a list of unsorted data. The latter algorithm
could be of value beyond particle physics, for instance in statistics. When one
or both of these algorithms are implemented into the classical versions of
well-known clustering algorithms (K-means, Affinity Propagation and $k_T$-jet)
we obtain efficiencies comparable to those of their classical counterparts.
Even more, exponential speed-up could be achieved, in the first two algorithms,
in data dimensionality and data length when the distance algorithm or the
maximum searching algorithm are applied.
|
[
{
"created": "Wed, 13 Apr 2022 16:27:04 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Apr 2022 15:13:47 GMT",
"version": "v2"
},
{
"created": "Fri, 13 May 2022 14:01:14 GMT",
"version": "v3"
},
{
"created": "Mon, 29 Aug 2022 09:09:14 GMT",
"version": "v4"
}
] |
2022-08-30
|
[
[
"de Lejarza",
"Jorge J. Martínez",
""
],
[
"Cieri",
"Leandro",
""
],
[
"Rodrigo",
"Germán",
""
]
] |
Clustering is one of the most frequent problems in many domains, in particular, in particle physics where jet reconstruction is central in experimental analyses. Jet clustering at the CERN's Large Hadron Collider (LHC) is computationally expensive and the difficulty of this task will increase with the upcoming High-Luminosity LHC (HL-LHC). In this paper, we study the case in which quantum computing algorithms might improve jet clustering by considering two novel quantum algorithms which may speed up the classical jet clustering algorithms. The first one is a quantum subroutine to compute a Minkowski-based distance between two data points, whereas the second one consists of a quantum circuit to track the maximum into a list of unsorted data. The latter algorithm could be of value beyond particle physics, for instance in statistics. When one or both of these algorithms are implemented into the classical versions of well-known clustering algorithms (K-means, Affinity Propagation and $k_T$-jet) we obtain efficiencies comparable to those of their classical counterparts. Even more, exponential speed-up could be achieved, in the first two algorithms, in data dimensionality and data length when the distance algorithm or the maximum searching algorithm are applied.
|
hep-ph/9511367
|
Masaharu Tanabashi
|
Masaharu Tanabashi (KEK)
|
Formulations of spin 1 resonances in the chiral lagrangian
|
14 pages, latex
|
Phys.Lett. B384 (1996) 218
|
10.1016/0370-2693(96)00827-1
|
KEK-TH 438
|
hep-ph
| null |
Equivalence of the hidden local symmetry formulation with non-minimal
interactions and the anti-symmetric tensor field method of $\rho$ and $a_1$
mesons in the chiral lagrangian is shown by using the auxiliary field method.
Violation of the KSRF I relation, which becomes important in the application of
chiral lagrangian to {\em non QCD-like} technicolor models can be parametrized
by non-minimal coupling in the hidden local symmetry formalism keeping low
energy theorem of hidden local symmetry. We also obtain explicit correspondence
of parameters in both formulations.
|
[
{
"created": "Mon, 20 Nov 1995 02:40:53 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Tanabashi",
"Masaharu",
"",
"KEK"
]
] |
Equivalence of the hidden local symmetry formulation with non-minimal interactions and the anti-symmetric tensor field method of $\rho$ and $a_1$ mesons in the chiral lagrangian is shown by using the auxiliary field method. Violation of the KSRF I relation, which becomes important in the application of chiral lagrangian to {\em non QCD-like} technicolor models can be parametrized by non-minimal coupling in the hidden local symmetry formalism keeping low energy theorem of hidden local symmetry. We also obtain explicit correspondence of parameters in both formulations.
|
1012.0629
|
Chun-Fu Ren
|
Xiao-Bing Zhang, Chun-Fu Ren and Yi Zhang
|
Bose-Einstein condensation in strong-coupling quark color superconductor
near flavor SU(3) limit
|
15 pages, 5 figures; 2nd version
|
Commun.Theor.Phys.55:1065-1072,2011
|
10.1088/0253-6102/55/6/22
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Near the flavor SU(3) limit, we propose an analytical description for
color-flavor-locked-type Bardeen-Cooper-Schrieffer (BCS) phase in the Nambu
Jona-Lasinio (NJL) model. The diquark behaviors in light-flavor and
strange-flavor-involved channels and Bose-Einstein condensation (BEC) of bound
diquark states are studied. When the attractive interaction between quarks is
strong enough, a BCS-BEC crossover is predicted in the environment with
color-flavor-locked pairing pattern. The resulting Bose-Einstein condensed
phase is found to be an intergrade phase before the emergence of the
previous-predicted BEC phase in two-flavor quark superconductor.
|
[
{
"created": "Fri, 3 Dec 2010 03:33:18 GMT",
"version": "v1"
},
{
"created": "Sun, 23 Jan 2011 03:13:10 GMT",
"version": "v2"
}
] |
2015-03-17
|
[
[
"Zhang",
"Xiao-Bing",
""
],
[
"Ren",
"Chun-Fu",
""
],
[
"Zhang",
"Yi",
""
]
] |
Near the flavor SU(3) limit, we propose an analytical description for color-flavor-locked-type Bardeen-Cooper-Schrieffer (BCS) phase in the Nambu Jona-Lasinio (NJL) model. The diquark behaviors in light-flavor and strange-flavor-involved channels and Bose-Einstein condensation (BEC) of bound diquark states are studied. When the attractive interaction between quarks is strong enough, a BCS-BEC crossover is predicted in the environment with color-flavor-locked pairing pattern. The resulting Bose-Einstein condensed phase is found to be an intergrade phase before the emergence of the previous-predicted BEC phase in two-flavor quark superconductor.
|
2304.10264
|
Noureddine Bekheddouma Abdi
|
N. Bekheddouma Abdi, R. Bouamrane and K. Khelifa-Kerfa
|
The effects of the widths on the one-loop electroweak corrections to the
$pp \to WW$ process
|
21 pages, 12 figures
| null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
In this paper, we study the effects of the widths of unstable particles on
the one-loop electroweak corrections for the $pp \to WW$ process at the TeV
scale within the framework of the complex mass scheme. We also investigate, for
this same process, the unitarity of the theory at high energies.
|
[
{
"created": "Thu, 20 Apr 2023 12:41:13 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Apr 2023 10:46:43 GMT",
"version": "v2"
},
{
"created": "Wed, 26 Apr 2023 19:54:10 GMT",
"version": "v3"
}
] |
2023-04-28
|
[
[
"Abdi",
"N. Bekheddouma",
""
],
[
"Bouamrane",
"R.",
""
],
[
"Khelifa-Kerfa",
"K.",
""
]
] |
In this paper, we study the effects of the widths of unstable particles on the one-loop electroweak corrections for the $pp \to WW$ process at the TeV scale within the framework of the complex mass scheme. We also investigate, for this same process, the unitarity of the theory at high energies.
|
2211.00011
|
Syuhei Iguro
|
Syuhei Iguro, Teppei Kitahara, Yuji Omura, and Hantian Zhang
|
Chasing the two-Higgs doublet model in the di-Higgs production
|
26 pages, 5 figures, supplemental material is available in
https://www.ttp.kit.edu/preprints/2022/ttp22-061/
|
Phys. Rev. D 107, 075017 (2023)
|
10.1103/PhysRevD.107.075017
|
P3H-22-102, TTP22-061, KEK-TH-2468
|
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
We investigate the di-Higgs production at the Large Hadron Collider in the
two-Higgs doublet model (2HDM). In particular, we study the production of an
extra neutral Higgs boson $\phi$ in association with the Standard Model (SM)
Higgs boson $h$ in the Higgs alignment limit. We analyze two scenarios where
the additional Higgs $\phi$ is CP-even or -odd state with a large top-Yukawa
interaction. The leading contribution of this production comes from the
top-quark loop-induced gluon-fusion channel $gg \to h\phi$. The measurement of
the $h\phi$ production can probe the quartic couplings in the Higgs potential
as well as the top-Yukawa couplings. Imposing both theoretical constraints
(from the perturbative unitarity and the vacuum stability bounds) and
experimental bounds (from the SM Higgs and flavor physics measurements) on the
2HDM parameter space, we calculate the production cross-section of $gg \to
h\phi$. Furthermore, we scrutinize these processes in the parameter spaces
where the CMS di-tau and di-photon excesses around 100$\,$GeV, and/or the muon
$g-2$ anomaly can be accommodated.
|
[
{
"created": "Mon, 31 Oct 2022 18:00:00 GMT",
"version": "v1"
},
{
"created": "Sun, 12 Mar 2023 18:14:00 GMT",
"version": "v2"
},
{
"created": "Wed, 19 Apr 2023 09:13:51 GMT",
"version": "v3"
}
] |
2023-04-20
|
[
[
"Iguro",
"Syuhei",
""
],
[
"Kitahara",
"Teppei",
""
],
[
"Omura",
"Yuji",
""
],
[
"Zhang",
"Hantian",
""
]
] |
We investigate the di-Higgs production at the Large Hadron Collider in the two-Higgs doublet model (2HDM). In particular, we study the production of an extra neutral Higgs boson $\phi$ in association with the Standard Model (SM) Higgs boson $h$ in the Higgs alignment limit. We analyze two scenarios where the additional Higgs $\phi$ is CP-even or -odd state with a large top-Yukawa interaction. The leading contribution of this production comes from the top-quark loop-induced gluon-fusion channel $gg \to h\phi$. The measurement of the $h\phi$ production can probe the quartic couplings in the Higgs potential as well as the top-Yukawa couplings. Imposing both theoretical constraints (from the perturbative unitarity and the vacuum stability bounds) and experimental bounds (from the SM Higgs and flavor physics measurements) on the 2HDM parameter space, we calculate the production cross-section of $gg \to h\phi$. Furthermore, we scrutinize these processes in the parameter spaces where the CMS di-tau and di-photon excesses around 100$\,$GeV, and/or the muon $g-2$ anomaly can be accommodated.
|
hep-ph/9404330
| null |
B. Grzadkowski
|
CP Violation in {\boldmath $H \ra t \overline{t}$} Decays at {\boldmath
$\epem$} Colliders
|
13 pages + 5 appended ps files with 5 figures, LaTex, Institute of
Theoretical Physics at Warsaw University, IFT 07/94 (a few misprints
corrected and numerical analysis modified, a new CP violating asymmetry
defined, all conclusions stay unchanged)
|
Phys.Lett.B338:71-79,1994
|
10.1016/0370-2693(94)91346-3
| null |
hep-ph
| null |
A helicity asymmetry for top quarks originating from Higgs boson decays is
investigated within the 2-Higgs Doublet Model. The asymmetry is sensitive to CP
violation in the scalar sector of the model, whereas it vanishes in the
Standard Model. It has been checked that without any fine tuning of parameters
the asymmetry can reach $50\%$. Standard decay patterns $\twbdec$ and
$\tbwbdec$ are utilized as spin analyzers to measure the asymmetry. The Higgs
production mechanism considered here is $\hprod$. It has been shown that signal
from the asymmetry can easy overcome the noise for Higgs bosons produced in
future linear $\epem$ colliders at energy $\sqrt{s}=500\gev$ operating with
integrated luminosity $L=2.0\times10^4\lumun$.
|
[
{
"created": "Sun, 24 Apr 1994 18:30:35 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Jun 1994 11:40:24 GMT",
"version": "v2"
}
] |
2010-11-01
|
[
[
"Grzadkowski",
"B.",
""
]
] |
A helicity asymmetry for top quarks originating from Higgs boson decays is investigated within the 2-Higgs Doublet Model. The asymmetry is sensitive to CP violation in the scalar sector of the model, whereas it vanishes in the Standard Model. It has been checked that without any fine tuning of parameters the asymmetry can reach $50\%$. Standard decay patterns $\twbdec$ and $\tbwbdec$ are utilized as spin analyzers to measure the asymmetry. The Higgs production mechanism considered here is $\hprod$. It has been shown that signal from the asymmetry can easy overcome the noise for Higgs bosons produced in future linear $\epem$ colliders at energy $\sqrt{s}=500\gev$ operating with integrated luminosity $L=2.0\times10^4\lumun$.
|
1011.2612
|
Giovanni Marco Pruna Mr
|
Lorenzo Basso, Stefano Moretti and Giovanni Marco Pruna
|
Phenomenology of the minimal $B-L$ extension of the Standard Model: the
Higgs sector
|
26 pages, 10 figures, corrected scaling in figures and related
discussions, conclusions unchanged, updated acknowledgement; updated
correction after PRD revision
|
Phys.Rev.D83:055014,2011
|
10.1103/PhysRevD.83.055014
|
SHEP-10-23
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the phenomenology of the Higgs sector of the minimal $B-L$
extension of the Standard Model. We present results for both the foreseen
energy stages of the Large Hadron Collider ($\sqrt s=7$ and 14 TeV). We show
that in such a scenario several novel production and decay channels involving
the two physical Higgs states could be accessed at such a machine. Amongst
these, several Higgs signatures have very distinctive features with respect to
those of other models with enlarged Higgs sector, as they involve interactions
of Higgs bosons between themselves, with $Z'$ bosons as well as with heavy
neutrinos.
|
[
{
"created": "Thu, 11 Nov 2010 11:05:59 GMT",
"version": "v1"
},
{
"created": "Sun, 28 Nov 2010 18:46:00 GMT",
"version": "v2"
},
{
"created": "Mon, 7 Feb 2011 17:29:37 GMT",
"version": "v3"
},
{
"created": "Fri, 18 Mar 2011 10:55:57 GMT",
"version": "v4"
}
] |
2015-03-17
|
[
[
"Basso",
"Lorenzo",
""
],
[
"Moretti",
"Stefano",
""
],
[
"Pruna",
"Giovanni Marco",
""
]
] |
We investigate the phenomenology of the Higgs sector of the minimal $B-L$ extension of the Standard Model. We present results for both the foreseen energy stages of the Large Hadron Collider ($\sqrt s=7$ and 14 TeV). We show that in such a scenario several novel production and decay channels involving the two physical Higgs states could be accessed at such a machine. Amongst these, several Higgs signatures have very distinctive features with respect to those of other models with enlarged Higgs sector, as they involve interactions of Higgs bosons between themselves, with $Z'$ bosons as well as with heavy neutrinos.
|
hep-ph/0208162
|
Zurab Tavartkiladze
|
Qaisar Shafi, Zurab Tavartkiladze
|
Democratic Approach To Atmospheric And Solar Neutrino Oscillations
|
Version to appear in Physics Letters B
|
Phys.Lett.B550:172-177,2002
|
10.1016/S0370-2693(02)02972-6
| null |
hep-ph
| null |
Working with a ${\cal U}(1)$ flavor symmetry, we show how the hierarchical
structure in the charged fermion sector and a democratic approach for neutrinos
that yields large solar and atmospheric neutrino mixings can be simultaneously
realized in the MSSM framework. However, in SU(5) due to the unified multiplets
we encounter difficulties. Namely, democracy for the neutrinos leads to a wrong
hierarchical pattern for charged fermion masses and mixings. We discuss how
this is overcome in flipped SU(5).
|
[
{
"created": "Fri, 16 Aug 2002 18:25:31 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Nov 2002 14:53:02 GMT",
"version": "v2"
}
] |
2011-05-12
|
[
[
"Shafi",
"Qaisar",
""
],
[
"Tavartkiladze",
"Zurab",
""
]
] |
Working with a ${\cal U}(1)$ flavor symmetry, we show how the hierarchical structure in the charged fermion sector and a democratic approach for neutrinos that yields large solar and atmospheric neutrino mixings can be simultaneously realized in the MSSM framework. However, in SU(5) due to the unified multiplets we encounter difficulties. Namely, democracy for the neutrinos leads to a wrong hierarchical pattern for charged fermion masses and mixings. We discuss how this is overcome in flipped SU(5).
|
hep-ph/0602109
|
Seong Youl Choi
|
S.Y. Choi and Y.G. Kim
|
Heavy Higgs Resonances for the Neutralino Relic Density in the Higgs
Decoupling Limit of the CP--noninvariant Minimal Supersymmetric Standard
Model
|
10 pages, 2 figures
|
Phys.Lett. B637 (2006) 27-31
|
10.1016/j.physletb.2006.04.029
|
DESY 06-011, KAIST-TH 2006/02
|
hep-ph
| null |
The lightest neutralino is a compelling candidate to account for cold dark
matter in the universe in supersymmetric theories with $R$--parity. In the
CP-invariant theory, the neutralino relic density can be found in accord with
recent WMAP data if neutralino annihilation in the early universe occurs via
the s-channel $A$ funnel. In contrast, in the CP-noninvariant theory two heavy
neutral Higgs bosons can contribute to the Higgs funnel mechanism significantly
due to a CP-violating {\it complex} mixing between two heavy states, in
particular, when they are almost degenerate. With a simple analytic and
numerical analysis, we demonstrate that the CP-violating Higgs mixing can
modify the profile of the neutralino relic density {\it considerably} in the
heavy Higgs funnel with the neutralino mass close to half of the heavy Higgs
masses.
|
[
{
"created": "Mon, 13 Feb 2006 10:25:53 GMT",
"version": "v1"
}
] |
2010-04-05
|
[
[
"Choi",
"S. Y.",
""
],
[
"Kim",
"Y. G.",
""
]
] |
The lightest neutralino is a compelling candidate to account for cold dark matter in the universe in supersymmetric theories with $R$--parity. In the CP-invariant theory, the neutralino relic density can be found in accord with recent WMAP data if neutralino annihilation in the early universe occurs via the s-channel $A$ funnel. In contrast, in the CP-noninvariant theory two heavy neutral Higgs bosons can contribute to the Higgs funnel mechanism significantly due to a CP-violating {\it complex} mixing between two heavy states, in particular, when they are almost degenerate. With a simple analytic and numerical analysis, we demonstrate that the CP-violating Higgs mixing can modify the profile of the neutralino relic density {\it considerably} in the heavy Higgs funnel with the neutralino mass close to half of the heavy Higgs masses.
|
hep-ph/9708458
|
James Amundson
|
James Amundson, Jon Pumplin and Carl Schmidt
|
Partonometry in W + jet production
|
LaTeX2e, style file included
|
Phys.Rev. D57 (1998) 527-533
|
10.1103/PhysRevD.57.527
|
MSU-HEP-70822
|
hep-ph
| null |
QCD predicts soft radiation patterns that are particularly simple for $W+
{jet}$ production. We demonstrate how these patterns can be used to distinguish
between the parton-level subprocesses probabilistically on an event-by-event
basis. As a test of our method we demonstrate correlations between the soft
radiation and the radiation inside the outgoing jet.
|
[
{
"created": "Tue, 26 Aug 1997 02:50:00 GMT",
"version": "v1"
}
] |
2009-10-30
|
[
[
"Amundson",
"James",
""
],
[
"Pumplin",
"Jon",
""
],
[
"Schmidt",
"Carl",
""
]
] |
QCD predicts soft radiation patterns that are particularly simple for $W+ {jet}$ production. We demonstrate how these patterns can be used to distinguish between the parton-level subprocesses probabilistically on an event-by-event basis. As a test of our method we demonstrate correlations between the soft radiation and the radiation inside the outgoing jet.
|
hep-ph/9410267
|
Aaron Keith Grant
|
Aaron K. Grant
|
The heavy top quark in the two Higgs doublet model
|
26 pages
|
Phys.Rev.D51:207-217,1995
|
10.1103/PhysRevD.51.207
|
EFI 94-24
|
hep-ph
| null |
Constraints on the two Higgs doublet model are presented, assuming a top mass
of 174 $\pm$ 17 GeV. We concentrate primarily on the ``type II'' model, where
up--type quarks receive their mass from one Higgs doublet, and down--type
quarks receive their mass from the second doublet. High energy constraints
derived from the $W$ mass, the full width of the $Z$ and the $b \bar b$ partial
width of the $Z$ are combined with low energy constraints from $\Gamma(b\to s
\gamma)$, $\Gamma(b \to c \tau \bar\nu_\tau)$ and $B^0$-$\bar B^0$ mixing to
determine the experimentally favored configurations of the model. This
combination of observables rules out small charged Higgs masses and small
values of $\tan\beta$, and provides some information about the neutral Higgs
masses and the mixing angle $\alpha$. In particular, constraints derived from
the $\rho$ parameter rule out configurations where the charged Higgs is much
heavier or much lighter than the neutral Higgses. We discuss a scenario where
$\Gamma(Z\to b \bar b)$ is enhanced relative to the standard model result,
which unfortunately is on the verge of being ruled out by the combination of
$\Gamma(b\to s \gamma)$ and $\rho$ parameter constraints. Implications for
various extensions of the standard model are briefly discussed.
|
[
{
"created": "Wed, 12 Oct 1994 03:42:30 GMT",
"version": "v1"
}
] |
2010-11-01
|
[
[
"Grant",
"Aaron K.",
""
]
] |
Constraints on the two Higgs doublet model are presented, assuming a top mass of 174 $\pm$ 17 GeV. We concentrate primarily on the ``type II'' model, where up--type quarks receive their mass from one Higgs doublet, and down--type quarks receive their mass from the second doublet. High energy constraints derived from the $W$ mass, the full width of the $Z$ and the $b \bar b$ partial width of the $Z$ are combined with low energy constraints from $\Gamma(b\to s \gamma)$, $\Gamma(b \to c \tau \bar\nu_\tau)$ and $B^0$-$\bar B^0$ mixing to determine the experimentally favored configurations of the model. This combination of observables rules out small charged Higgs masses and small values of $\tan\beta$, and provides some information about the neutral Higgs masses and the mixing angle $\alpha$. In particular, constraints derived from the $\rho$ parameter rule out configurations where the charged Higgs is much heavier or much lighter than the neutral Higgses. We discuss a scenario where $\Gamma(Z\to b \bar b)$ is enhanced relative to the standard model result, which unfortunately is on the verge of being ruled out by the combination of $\Gamma(b\to s \gamma)$ and $\rho$ parameter constraints. Implications for various extensions of the standard model are briefly discussed.
|
hep-ph/9808295
|
Dr. Burkhard Kleihaus
|
B. Kleihaus (NUI Maynooth, Ireland)
|
Energy barrier in the two-Higgs model
|
19 pages, including 4 eps figures, LaTex format, new results included
|
Mod.Phys.Lett. A14 (1999) 1431-1444
|
10.1142/S021773239900153X
| null |
hep-ph hep-th
| null |
The electroweak model is extended by a second Higgs doublet and a numerical
investigation of static, finite energy classical solutions is performed. The
results indicate that for a large domain of the parameters of the Higgs
potential, the energy barrier between topologically distinct vacua of the
Lagrangian is constituted by a bisphaleron.
|
[
{
"created": "Tue, 11 Aug 1998 15:55:29 GMT",
"version": "v1"
},
{
"created": "Thu, 24 Jun 1999 11:55:33 GMT",
"version": "v2"
}
] |
2009-10-31
|
[
[
"Kleihaus",
"B.",
"",
"NUI Maynooth, Ireland"
]
] |
The electroweak model is extended by a second Higgs doublet and a numerical investigation of static, finite energy classical solutions is performed. The results indicate that for a large domain of the parameters of the Higgs potential, the energy barrier between topologically distinct vacua of the Lagrangian is constituted by a bisphaleron.
|
hep-ph/0609256
|
Ulf-G. Mei{\ss}ner
|
Matthias Frink, Ulf-G. Mei{\ss}ner
|
On the chiral effective meson-baryon Lagrangian at third order
|
6 pp, accepted for publication in Eur. Phys. J. A
|
Eur.Phys.J.A29:255-260,2006
|
10.1140/epja/i2006-10105-x
|
HISKP-TH-06/29
|
hep-ph
| null |
We show that the recently constructed complete and ``minimal'' third order
meson-baryon effective chiral Lagrangian can be further reduced from 84 to 78
independent operators.
|
[
{
"created": "Mon, 25 Sep 2006 15:49:39 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Sep 2006 10:50:30 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Frink",
"Matthias",
""
],
[
"Meißner",
"Ulf-G.",
""
]
] |
We show that the recently constructed complete and ``minimal'' third order meson-baryon effective chiral Lagrangian can be further reduced from 84 to 78 independent operators.
|
0903.1776
|
Alejandro Ibarra
|
Alejandro Ibarra and Cristoforo Simonetto
|
Probing Supersymmetric Leptogenesis with mu --> e gamma
|
24 pages, 1 figure. Flavour effects included. Version accepted in
JHEP
|
JHEP 0908:113,2009
|
10.1088/1126-6708/2009/08/113
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Extending the Minimal Supersymmetric Standard Model with three right-handed
neutrino superfields is one of the best motivated scenarios for physics beyond
the Standard Model. However, very little is known from observations about the
high energy parameters of this model. In this paper we show, under the
plausible assumptions that the neutrino Yukawa eigenvalues are hierarchical and
the absence of cancellations, that there exists an upper bound on the smallest
Yukawa eigenvalue stemming from the non-observation of the rare lepton decay mu
--> e gamma. Furthermore, we show that this bound implies an upper bound on the
lightest right-handed neutrino mass of approximately 5x10^12 GeV for typical
supersymmetric parameters. We also discuss the implications of this upper bound
for the minimal leptogenesis scenario based on the decay of the lightest
right-handed neutrino and we argue that an improvement of sensitivity of six
orders of magnitude to the process mu --> e gamma could rule out this mechanism
as the origin of the observed baryon asymmetry, unless the neutrino parameters
take very specific values.
|
[
{
"created": "Tue, 10 Mar 2009 14:22:29 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Sep 2009 12:55:56 GMT",
"version": "v2"
}
] |
2009-10-02
|
[
[
"Ibarra",
"Alejandro",
""
],
[
"Simonetto",
"Cristoforo",
""
]
] |
Extending the Minimal Supersymmetric Standard Model with three right-handed neutrino superfields is one of the best motivated scenarios for physics beyond the Standard Model. However, very little is known from observations about the high energy parameters of this model. In this paper we show, under the plausible assumptions that the neutrino Yukawa eigenvalues are hierarchical and the absence of cancellations, that there exists an upper bound on the smallest Yukawa eigenvalue stemming from the non-observation of the rare lepton decay mu --> e gamma. Furthermore, we show that this bound implies an upper bound on the lightest right-handed neutrino mass of approximately 5x10^12 GeV for typical supersymmetric parameters. We also discuss the implications of this upper bound for the minimal leptogenesis scenario based on the decay of the lightest right-handed neutrino and we argue that an improvement of sensitivity of six orders of magnitude to the process mu --> e gamma could rule out this mechanism as the origin of the observed baryon asymmetry, unless the neutrino parameters take very specific values.
|
hep-ph/9611264
| null |
Miguel A. Sanchis-Lozano, Beatriz Cano-Coloma
|
J/psi Production at the LHC
|
4 pages, LaTex, 3 Figures included in the text, Contribution to the
2nd Int. Conference on Hyperons, charm and beauty hadrons (Montreal, Aug
27-30, 1996)
|
Nucl.Phys.Proc.Suppl. 55A (1997) 277-280
|
10.1016/S0920-5632(97)00187-4
| null |
hep-ph
| null |
We firstly examine hadroproduction of prompt J/psi's at the Fermilab Tevatron
in a Monte Carlo Framework by means of the event generator PYTHIA 5.7 in which
those colour-octet matrix elements processes relevant for charmonium production
have been implemented accordingly. We find that colour-octet matrix elements
presented in literature from p-pbar collider data are systematically
overestimated due to overlooking of the effective primordial transverse
momentum of partons (i.e. including higher-order QCD effects). We estimate the
size of these effects using different parton distribution functions. Finally,
after normalization to Tevatron data, we extrapolate up to LHC energies making
a prediction on the expected pt differential cross-section for charmonium.
|
[
{
"created": "Thu, 7 Nov 1996 13:16:49 GMT",
"version": "v1"
}
] |
2009-10-30
|
[
[
"Sanchis-Lozano",
"Miguel A.",
""
],
[
"Cano-Coloma",
"Beatriz",
""
]
] |
We firstly examine hadroproduction of prompt J/psi's at the Fermilab Tevatron in a Monte Carlo Framework by means of the event generator PYTHIA 5.7 in which those colour-octet matrix elements processes relevant for charmonium production have been implemented accordingly. We find that colour-octet matrix elements presented in literature from p-pbar collider data are systematically overestimated due to overlooking of the effective primordial transverse momentum of partons (i.e. including higher-order QCD effects). We estimate the size of these effects using different parton distribution functions. Finally, after normalization to Tevatron data, we extrapolate up to LHC energies making a prediction on the expected pt differential cross-section for charmonium.
|
hep-ph/0409344
|
Matthew Mewes
|
Matthew Mewes
|
Lorentz violation and neutrinos
|
Presented at 3rd Meeting on CPT and Lorentz Symmetry (CPT 04),
Bloomington, Indiana, 4-7 Aug 2004
| null |
10.1142/9789812702173_0004
| null |
hep-ph
| null |
Neutrino oscillations provide an opportunity for sensitive tests of Lorentz
invariance. This talk reviews some aspects of Lorentz violation in neutrinos
and the prospect of testing Lorentz invariance in neutrino-oscillation
experiments. A general Lorentz-violating theory for neutrinos is discussed, and
some signals of Lorentz violation are identified.
|
[
{
"created": "Wed, 29 Sep 2004 15:51:35 GMT",
"version": "v1"
}
] |
2016-11-03
|
[
[
"Mewes",
"Matthew",
""
]
] |
Neutrino oscillations provide an opportunity for sensitive tests of Lorentz invariance. This talk reviews some aspects of Lorentz violation in neutrinos and the prospect of testing Lorentz invariance in neutrino-oscillation experiments. A general Lorentz-violating theory for neutrinos is discussed, and some signals of Lorentz violation are identified.
|
2207.03503
|
Amlan Chakraborty
|
Fabrizio Caola, Amlan Chakraborty, Giulio Gambuti, Andreas von
Manteuffel, Lorenzo Tancredi
|
Three-loop helicity amplitudes for quark-gluon scattering in QCD
|
32 Pages, 4 figures, ancillary files with analytical results
| null |
10.1007/JHEP12(2022)082
|
OUTP-22-09P, MSUHEP-22-023, TUM-HEP-1404/22
|
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We compute the three-loop helicity amplitudes for $q\bar{q} \to gg$ and its
crossed partonic channels, in massless QCD. Our analytical results provide a
non-trivial check of the color quadrupole contribution to the infrared poles
for external states in different color representations. At high energies, the
$qg \to qg$ amplitude shows the predicted factorized form from Regge theory and
confirms previous results for the gluon Regge trajectory extracted from $qq'
\to qq'$ and $gg \to gg$ scattering.
|
[
{
"created": "Thu, 7 Jul 2022 18:00:04 GMT",
"version": "v1"
}
] |
2023-01-04
|
[
[
"Caola",
"Fabrizio",
""
],
[
"Chakraborty",
"Amlan",
""
],
[
"Gambuti",
"Giulio",
""
],
[
"von Manteuffel",
"Andreas",
""
],
[
"Tancredi",
"Lorenzo",
""
]
] |
We compute the three-loop helicity amplitudes for $q\bar{q} \to gg$ and its crossed partonic channels, in massless QCD. Our analytical results provide a non-trivial check of the color quadrupole contribution to the infrared poles for external states in different color representations. At high energies, the $qg \to qg$ amplitude shows the predicted factorized form from Regge theory and confirms previous results for the gluon Regge trajectory extracted from $qq' \to qq'$ and $gg \to gg$ scattering.
|
hep-ph/0103006
|
Nicola Fabiano
|
Nicola Fabiano
|
Estimates of threshold cross section for stoponium production at e+e-
colliders
|
To appear in EPJ. 13 pages, 5 figures, latex2e
|
Eur.Phys.J.C19:547-551,2001
|
10.1007/s100520100638
| null |
hep-ph
| null |
We estimate the total ee to stoponium cross section near threshold for a
Coulombic potential and compare it to the Born approximation. The effect of the
beam energy spread for present and future ee colliders is discussed.
|
[
{
"created": "Thu, 1 Mar 2001 12:09:24 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Mar 2001 13:28:49 GMT",
"version": "v2"
}
] |
2009-01-07
|
[
[
"Fabiano",
"Nicola",
""
]
] |
We estimate the total ee to stoponium cross section near threshold for a Coulombic potential and compare it to the Born approximation. The effect of the beam energy spread for present and future ee colliders is discussed.
|
hep-ph/9403240
|
Damien Pierce
|
Damien Pierce and Aris Papadopoulos
|
The complete radiative corrections to the gaugino and Higgsino masses in
the Minimal Supersymmetric Model
|
16 pages, JHU-TIPAC-940001, PURD-TH-94-04. 6 uuencoded postscript
figures included. Uncomment the line "%\input epsf" to embed the figures in
the text
|
Nucl.Phys. B430 (1994) 278-294
|
10.1016/0550-3213(94)00303-3
| null |
hep-ph
| null |
We determine the radiative corrections to the masses of the gauginos and
Higgsinos in the MSSM, including all sectors of the theory in a one-loop
calculation in the on-mass-shell renormalization scheme. We find that a gluino
which is massless at tree level receives a mass of between 0 and 3 GeV,
primarily due to the top/stop contribution. This radiatively generated mass
depends directly on the off-diagonal element of the squark mass matrix. In the
case of a massive gluino, its mass receives typically large corrections, as
large as 40\% for a 125 GeV gluino. We find that the contributions to the
neutralino and chargino mass corrections from the gauge/Higgs/gaugino/Higgsino
sector are typically +-1%. The lightest neutralino, which can receive
corrections larger than 25%, receives 5% corrections over most of the parameter
space. We combine our results with the results of LEP and CDF searches to
obtain the lower bounds on the neutralino and chargino masses at one-loop. We
also demonstrate how the radiative corrections affect the presently excluded
region of parameter space.
|
[
{
"created": "Mon, 7 Mar 1994 22:21:49 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Pierce",
"Damien",
""
],
[
"Papadopoulos",
"Aris",
""
]
] |
We determine the radiative corrections to the masses of the gauginos and Higgsinos in the MSSM, including all sectors of the theory in a one-loop calculation in the on-mass-shell renormalization scheme. We find that a gluino which is massless at tree level receives a mass of between 0 and 3 GeV, primarily due to the top/stop contribution. This radiatively generated mass depends directly on the off-diagonal element of the squark mass matrix. In the case of a massive gluino, its mass receives typically large corrections, as large as 40\% for a 125 GeV gluino. We find that the contributions to the neutralino and chargino mass corrections from the gauge/Higgs/gaugino/Higgsino sector are typically +-1%. The lightest neutralino, which can receive corrections larger than 25%, receives 5% corrections over most of the parameter space. We combine our results with the results of LEP and CDF searches to obtain the lower bounds on the neutralino and chargino masses at one-loop. We also demonstrate how the radiative corrections affect the presently excluded region of parameter space.
|
1310.3634
|
Xiao-ping Wang
|
Jia Liu, Xiao-Ping Wang and Shou-hua Zhu
|
Discovering extra Higgs boson via pair production of the SM-like Higgs
bosons
|
32pages, 16 figures, and 17 tables
| null | null | null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In the standard model (SM), pair production rate of Higgs boson at the Large
Hadron Collider (LHC) is quite low. One usually think that it is extremely
important for the measurement of triple Higgs coupling at the high luminosity
LHC. In this paper, we propose to search for the extra Higgs boson (denoted as
$S$) utilizing pair production of the SM-like Higgs boson ($H$) which was
discovered in July, 2012.The pair production of $H$ can be huge due to the
resonant production of heavy scalar $S$, namely $PP \rightarrow S \rightarrow
HH$. The couplings of $H$ with weak gauge boson are similar to ones in the SM
and it implies that the couplings between $S$ and gauge bosons are likely
suppressed. Provided that $S$ is heavy enough, the decay into weak gauge bosons
may not be the dominant modes. Instead $S$ can decay into a pair of $H$ and
offer the promising channel to discover it. In this paper, we studied the 5
promising decay modes of $H$, i.e. $b\bar{b}$, $WW^*$, $ZZ^*$, $\gamma\gamma$
and $\tau^+\tau^-$, and simulated the signals and backgrounds for the 15
combination modes for $HH$ at the LHC with $\sqrt{s}= 14$ TeV and integrated
luminosity $\mathcal{L}=1000fb^{-1}$. We found that with the help of suitable
selection rules, very good signal to background ratio $S/B$ can be archived in
many decay channels, for example $b\bar b+ (WW^*, ZZ^*, \gamma\gamma,
\tau^+\tau^-)$, $WW^*+(WW^*, ZZ^*, \gamma\gamma, \tau^+\tau^-)$ and
$\tau^+\tau^- +(\gamma\gamma, \tau^+\tau^-)$. For the detailed results please
refer to Table \ref{tab:discovery} in the text. On the contrary, $b\bar b b\bar
b$ mode is less important due to the huge QCD background. However if one has
excellent control on light jet mis-tagging, the $b\bar b b\bar b$ mode can be
promising to discover the extra Higgs boson due to its the largest branching
ratio compared to other modes.
|
[
{
"created": "Mon, 14 Oct 2013 11:28:35 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Nov 2013 02:19:12 GMT",
"version": "v2"
}
] |
2013-11-05
|
[
[
"Liu",
"Jia",
""
],
[
"Wang",
"Xiao-Ping",
""
],
[
"Zhu",
"Shou-hua",
""
]
] |
In the standard model (SM), pair production rate of Higgs boson at the Large Hadron Collider (LHC) is quite low. One usually think that it is extremely important for the measurement of triple Higgs coupling at the high luminosity LHC. In this paper, we propose to search for the extra Higgs boson (denoted as $S$) utilizing pair production of the SM-like Higgs boson ($H$) which was discovered in July, 2012.The pair production of $H$ can be huge due to the resonant production of heavy scalar $S$, namely $PP \rightarrow S \rightarrow HH$. The couplings of $H$ with weak gauge boson are similar to ones in the SM and it implies that the couplings between $S$ and gauge bosons are likely suppressed. Provided that $S$ is heavy enough, the decay into weak gauge bosons may not be the dominant modes. Instead $S$ can decay into a pair of $H$ and offer the promising channel to discover it. In this paper, we studied the 5 promising decay modes of $H$, i.e. $b\bar{b}$, $WW^*$, $ZZ^*$, $\gamma\gamma$ and $\tau^+\tau^-$, and simulated the signals and backgrounds for the 15 combination modes for $HH$ at the LHC with $\sqrt{s}= 14$ TeV and integrated luminosity $\mathcal{L}=1000fb^{-1}$. We found that with the help of suitable selection rules, very good signal to background ratio $S/B$ can be archived in many decay channels, for example $b\bar b+ (WW^*, ZZ^*, \gamma\gamma, \tau^+\tau^-)$, $WW^*+(WW^*, ZZ^*, \gamma\gamma, \tau^+\tau^-)$ and $\tau^+\tau^- +(\gamma\gamma, \tau^+\tau^-)$. For the detailed results please refer to Table \ref{tab:discovery} in the text. On the contrary, $b\bar b b\bar b$ mode is less important due to the huge QCD background. However if one has excellent control on light jet mis-tagging, the $b\bar b b\bar b$ mode can be promising to discover the extra Higgs boson due to its the largest branching ratio compared to other modes.
|
hep-ph/0701269
|
Johann Haidenbauer
|
A. Sibirtsev, J. Haidenbauer, H.-W. Hammer, Ulf-G. Mei{\ss}ner
|
The pp -> K^+Sigma^+n cross section from missing mass spectra
|
12 pages, 8 figures
|
Eur.Phys.J.A32:229-241,2007
|
10.1140/epja/i2007-10370-1
|
FZJ-IKP(TH)-2007-07
|
hep-ph nucl-th
| null |
We utilize existing inclusive data on K^+ meson momentum spectra of the
reaction pp -> K^+X at T_p = 2.3 - 2.85 GeV to deduce total cross sections for
pp -> K^+\Sigma^+n. The method used to extract those cross sections is
explained and discussed in detail. Our result for T_p = 2.85 GeV is consistent
with the data point from a direct measurement at the same beam energy. The
cross section obtained for T_p = 2.3 GeV is with 13.7\pm2.3 \mu b considerably
smaller than the value found in a recent experiment by the COSY-11
Collaboration at a somewhat lower beam energy, indicating that the pp ->
K^+\Sigma^+n reaction cross section could exhibit a rather unusual energy
dependence.
|
[
{
"created": "Wed, 31 Jan 2007 13:48:07 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Sibirtsev",
"A.",
""
],
[
"Haidenbauer",
"J.",
""
],
[
"Hammer",
"H. -W.",
""
],
[
"Meißner",
"Ulf-G.",
""
]
] |
We utilize existing inclusive data on K^+ meson momentum spectra of the reaction pp -> K^+X at T_p = 2.3 - 2.85 GeV to deduce total cross sections for pp -> K^+\Sigma^+n. The method used to extract those cross sections is explained and discussed in detail. Our result for T_p = 2.85 GeV is consistent with the data point from a direct measurement at the same beam energy. The cross section obtained for T_p = 2.3 GeV is with 13.7\pm2.3 \mu b considerably smaller than the value found in a recent experiment by the COSY-11 Collaboration at a somewhat lower beam energy, indicating that the pp -> K^+\Sigma^+n reaction cross section could exhibit a rather unusual energy dependence.
|
hep-ph/9906307
|
Utpal Sarkar
|
Yong Liu and Utpal Sarkar
|
CP violation in neutrino mixing matrix and leptogenesis
|
11 pages with one eps figure
|
Mod.Phys.Lett.A16:603,2001
|
10.1142/S0217732301003528
| null |
hep-ph
| null |
The CP violation required in leptogenesis may have different origin, but in
an effective theory they all are related to the rephasing invariant CP
violating measure in the mixing matrix of the leptonic sector. We point out
that the maximum amount of CP violation in some models can be estimated with
our present knowledge of the neutrino mixing angles, which can help us
understand the CP violation in the generation of the lepton asymmetry of the
universe. For example, the possibility of leptogenesis may be ruled out in some
models from an knowledge of the effective neutrino mass matrix.
|
[
{
"created": "Wed, 9 Jun 1999 17:14:08 GMT",
"version": "v1"
}
] |
2011-09-16
|
[
[
"Liu",
"Yong",
""
],
[
"Sarkar",
"Utpal",
""
]
] |
The CP violation required in leptogenesis may have different origin, but in an effective theory they all are related to the rephasing invariant CP violating measure in the mixing matrix of the leptonic sector. We point out that the maximum amount of CP violation in some models can be estimated with our present knowledge of the neutrino mixing angles, which can help us understand the CP violation in the generation of the lepton asymmetry of the universe. For example, the possibility of leptogenesis may be ruled out in some models from an knowledge of the effective neutrino mass matrix.
|
1207.5859
|
Lei Guo
|
Duan Peng-Fei, Zhang Ren-You, Ma Wen-Gan, Guo Lei and Zhang Yu
|
QCD correction to gluino decay to $t\bar{t}\tilde{\chi}^0_1$ in the MSSM
|
23 pages, 10 figures
|
J. Phys. G: Nucl. Part. Phys. 39 (2012) 105002
|
10.1088/0954-3899/39/10/105002
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We calculate the complete next-to-leading order QCD corrections to the
three-body decay of gluino into top-pair associated with a lightest neutralino
in the minimal supersymmetric standard model. We obtain that the LO and NLO QCD
corrected decay widths of $\tilde{g} \to t \bar{t} \tilde{\chi}_1^0$ at the
${\rm SPS 6}$ benchmark point are $0.1490 GeV$ and 0.1069 GeV respectively, and
the relative correction is -28.2%. We investigate the dependence of the QCD
correction to $\tilde{g} \to t \bar{t} \tilde{\chi}_1^0$ on $\tan\beta$ and the
masses of gluino, scalar top quarks and the lightest neutralino around the
${\rm SPS6}$ benchmark point, separately. We find that the NLO QCD corrections
suppress the LO decay width, and the absolute relative correction can exceed
30% in some parameter space. Therefore, the QCD corrections to the three-body
decay $\tilde{g} \to t\bar{t}\tilde{\chi}^0_1$ should be taken into account for
the precise experimental measurement at future colliders. Moreover, we study
the distributions of the top-pair invariant mass ($M_{t\bar t}$) and the
missing energy ($E^{miss}$), and find that the line shapes of the LO
distributions of $M_{t\bar t}$ and $E^{miss}$ are not obviously distorted by
the NLO QCD corrections.
|
[
{
"created": "Wed, 25 Jul 2012 01:12:00 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Aug 2012 06:28:51 GMT",
"version": "v2"
}
] |
2012-08-28
|
[
[
"Peng-Fei",
"Duan",
""
],
[
"Ren-You",
"Zhang",
""
],
[
"Wen-Gan",
"Ma",
""
],
[
"Lei",
"Guo",
""
],
[
"Yu",
"Zhang",
""
]
] |
We calculate the complete next-to-leading order QCD corrections to the three-body decay of gluino into top-pair associated with a lightest neutralino in the minimal supersymmetric standard model. We obtain that the LO and NLO QCD corrected decay widths of $\tilde{g} \to t \bar{t} \tilde{\chi}_1^0$ at the ${\rm SPS 6}$ benchmark point are $0.1490 GeV$ and 0.1069 GeV respectively, and the relative correction is -28.2%. We investigate the dependence of the QCD correction to $\tilde{g} \to t \bar{t} \tilde{\chi}_1^0$ on $\tan\beta$ and the masses of gluino, scalar top quarks and the lightest neutralino around the ${\rm SPS6}$ benchmark point, separately. We find that the NLO QCD corrections suppress the LO decay width, and the absolute relative correction can exceed 30% in some parameter space. Therefore, the QCD corrections to the three-body decay $\tilde{g} \to t\bar{t}\tilde{\chi}^0_1$ should be taken into account for the precise experimental measurement at future colliders. Moreover, we study the distributions of the top-pair invariant mass ($M_{t\bar t}$) and the missing energy ($E^{miss}$), and find that the line shapes of the LO distributions of $M_{t\bar t}$ and $E^{miss}$ are not obviously distorted by the NLO QCD corrections.
|
hep-ph/0409328
|
T. Lappi
|
T. Lappi
|
Rapidity distribution of gluons in the classical field model for heavy
ion collisions
|
REVTeX 4, 6 pages, 4 figures
|
Phys.Rev. C70 (2004) 054905
|
10.1103/PhysRevC.70.054905
|
HIP-2004-49/TH
|
hep-ph nucl-th
| null |
The rapidity distribution of gluons produced in heavy ion collisions is
studied by a numerical computation in 2+1-dimensional classical Yang-Mills
theory. By assuming that the classical source strength g^2 mu depends on
rapidity as g^4 mu^2 ~ exp(+- lambda y) and studying collisions of two nuclei
with different g^2 mu we find that the rapidity distribution of produced gluons
at central rapidities is very broad. The transverse energy is seen to decrease
even more slowly as a function of y than the multiplicity. We discuss these
results and the range in y and sqrt(s) where they are applicable in the light
of experimental results and other theoretical calculations.
|
[
{
"created": "Tue, 28 Sep 2004 19:25:46 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Lappi",
"T.",
""
]
] |
The rapidity distribution of gluons produced in heavy ion collisions is studied by a numerical computation in 2+1-dimensional classical Yang-Mills theory. By assuming that the classical source strength g^2 mu depends on rapidity as g^4 mu^2 ~ exp(+- lambda y) and studying collisions of two nuclei with different g^2 mu we find that the rapidity distribution of produced gluons at central rapidities is very broad. The transverse energy is seen to decrease even more slowly as a function of y than the multiplicity. We discuss these results and the range in y and sqrt(s) where they are applicable in the light of experimental results and other theoretical calculations.
|
2103.16859
|
Rahul Ramachandran Nair
|
Rahul Ramachandran Nair
|
Light front analysis towards the study of thermalisation in pp
collisions at $\sqrt{s}= 13$ TeV
|
9 pages, 4 figures, 2 tables
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
An analysis involving the light front variables of inclusively produced
hadrons in proton-proton (pp) collisions to study the thermalisation and
formation of a QGP-like medium is presented in this paper. Two schemes of
analysis are discussed and performed with inclusively produced $\pi^{\pm}$,
$K^{\pm}$ and $p(\bar{p})$ in the central pp collisions at $\sqrt{s} = 13$ TeV
simulated using the PYTHIA 8 event generator. It is shown that a group of
$\pi^{\pm}$ and $K^{\pm}$ falling inside a paraboloid defined by a certain
constant value of the light front variable in their respective phase space
follows the Bose-Einstein statistics while the $p(\bar{p})$ inside the similar
paraboloid in its phase space follows the Fermi-Dirac statistics. It is also
shown that for the $\pi^{\pm}$, $K^{\pm}$ and $p(\bar{p})$ with transverse
momentum $p_{T} < 1$ GeV in these collisions, a polynomial in $p_T$ can be
constructed for a specific light front variable of the particle $\zeta_c (p_T)$
such that the $\pi^{\pm}$ and $K^{\pm}$ with their light front variable
$\zeta^{\pm} > \zeta_c (p_T)$ follows Bose-Einstein statistics while the
$p(\bar{p})$ with $\zeta^{\pm} > \zeta_c (p_T)$ follows the Fermi-Dirac
statistics. The analysis can serve as a baseline for an investigation towards
the QGP formation and thermalisation in the pp collisions at LHC.
|
[
{
"created": "Wed, 31 Mar 2021 07:20:00 GMT",
"version": "v1"
}
] |
2021-04-01
|
[
[
"Nair",
"Rahul Ramachandran",
""
]
] |
An analysis involving the light front variables of inclusively produced hadrons in proton-proton (pp) collisions to study the thermalisation and formation of a QGP-like medium is presented in this paper. Two schemes of analysis are discussed and performed with inclusively produced $\pi^{\pm}$, $K^{\pm}$ and $p(\bar{p})$ in the central pp collisions at $\sqrt{s} = 13$ TeV simulated using the PYTHIA 8 event generator. It is shown that a group of $\pi^{\pm}$ and $K^{\pm}$ falling inside a paraboloid defined by a certain constant value of the light front variable in their respective phase space follows the Bose-Einstein statistics while the $p(\bar{p})$ inside the similar paraboloid in its phase space follows the Fermi-Dirac statistics. It is also shown that for the $\pi^{\pm}$, $K^{\pm}$ and $p(\bar{p})$ with transverse momentum $p_{T} < 1$ GeV in these collisions, a polynomial in $p_T$ can be constructed for a specific light front variable of the particle $\zeta_c (p_T)$ such that the $\pi^{\pm}$ and $K^{\pm}$ with their light front variable $\zeta^{\pm} > \zeta_c (p_T)$ follows Bose-Einstein statistics while the $p(\bar{p})$ with $\zeta^{\pm} > \zeta_c (p_T)$ follows the Fermi-Dirac statistics. The analysis can serve as a baseline for an investigation towards the QGP formation and thermalisation in the pp collisions at LHC.
|
2312.00382
|
Huiwen Zheng
|
Hui-wen Zheng, Yi Lu, Fei Gao, Si-xue Qin, Yu-xin Liu
|
The effective potential of composite operator in the first order region
of QCD phase transition
| null | null | null | null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We propose a method to determine the effective potential of QCD from the gap
equation, by introducing the homotopy method between the solutions of the
equation of motion. Via this method, the effective potential beyond the bare
vertex approximation is obtained, which then generalizes the Cornwall, Jackiw
and Tomboulis (CJT) effective potential for the bilocal composite operators.
Moreover, the extended effective potential is set to be a function of self
energy instead of the propagator, which is the key point for the potential to
be bounded from below. We then investigate the extended effective potential in
the cases of phase transition of the QCD vacuum with a small current quark
mass, and the first-order phase transition of QCD at finite temperature and
high baryon chemical potential. In the former case, the effective potential
shows as an inflection point at the critical mass where the multiple solutions
of the Dyson-Schwinger equation (DSE) vanishes, which is consistent with that
obtained by solving the DSE directly. For the latter case, the in-medium
properties, such as the latent heat and the difference of trace anomaly, of QCD
is obtained.
|
[
{
"created": "Fri, 1 Dec 2023 07:12:58 GMT",
"version": "v1"
},
{
"created": "Fri, 3 May 2024 02:54:39 GMT",
"version": "v2"
}
] |
2024-05-06
|
[
[
"Zheng",
"Hui-wen",
""
],
[
"Lu",
"Yi",
""
],
[
"Gao",
"Fei",
""
],
[
"Qin",
"Si-xue",
""
],
[
"Liu",
"Yu-xin",
""
]
] |
We propose a method to determine the effective potential of QCD from the gap equation, by introducing the homotopy method between the solutions of the equation of motion. Via this method, the effective potential beyond the bare vertex approximation is obtained, which then generalizes the Cornwall, Jackiw and Tomboulis (CJT) effective potential for the bilocal composite operators. Moreover, the extended effective potential is set to be a function of self energy instead of the propagator, which is the key point for the potential to be bounded from below. We then investigate the extended effective potential in the cases of phase transition of the QCD vacuum with a small current quark mass, and the first-order phase transition of QCD at finite temperature and high baryon chemical potential. In the former case, the effective potential shows as an inflection point at the critical mass where the multiple solutions of the Dyson-Schwinger equation (DSE) vanishes, which is consistent with that obtained by solving the DSE directly. For the latter case, the in-medium properties, such as the latent heat and the difference of trace anomaly, of QCD is obtained.
|
2002.03547
|
Andre Veiga Giannini
|
Andre V. Giannini and Yasushi Nara
|
Non-perturbative renormalization of the average color charge and
multi-point correlators of color charge from a non-Gaussian small-$x$ action
|
v4: The right panel of figure 5 now shows the leading order result in
the Z->0 region, in agreement with Eqs. (52) - (54) (now written for an
arbitrary number of colors, Nc). Matches the published version
| null |
10.1016/j.nuclphysa.2021.122178
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The McLerran-Venugopalan (MV) model is a Gaussian effective theory of color
charge fluctuations at small-$x$ in the limit of large valence charge density,
{\it i}.{\it e}., a large nucleus made of uncorrelated color charges. In this
work, we explore the effects of the first non-trivial (even C-parity)
non-Gaussian correction on the color charge density to the MV model ("quartic"
term) in SU(2) and SU(3) color group in the non-perturbative regime. We compare
our (numerical) non-perturbative results to (analytical) perturbative ones in
the limit of small or large non-Gaussian fluctuations. The couplings in the
non-Gaussian action, $\bar\mu$ for the quadratic and $\kappa_4$ for the quartic
term, need to be renormalized in order to match the two-point function in the
Gaussian theory. We investigate three different choices for the renormalization
of these couplings: i) $\kappa_{4}$ is proportional to a power of $\bar\mu$;
ii) $\kappa_4$ is kept constant and iii) $\bar\mu$ is kept constant. We find
that the first two choices lead to a scenario where the small-$x$ action
evolves towards a theory dominated by large non-Gaussian fluctuations,
regardless of the system size, while the last one allows for controlling the
deviations from the MV model.
|
[
{
"created": "Mon, 10 Feb 2020 05:08:11 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Jul 2020 20:04:46 GMT",
"version": "v2"
},
{
"created": "Fri, 18 Dec 2020 19:22:50 GMT",
"version": "v3"
},
{
"created": "Wed, 10 Mar 2021 13:26:20 GMT",
"version": "v4"
}
] |
2021-03-11
|
[
[
"Giannini",
"Andre V.",
""
],
[
"Nara",
"Yasushi",
""
]
] |
The McLerran-Venugopalan (MV) model is a Gaussian effective theory of color charge fluctuations at small-$x$ in the limit of large valence charge density, {\it i}.{\it e}., a large nucleus made of uncorrelated color charges. In this work, we explore the effects of the first non-trivial (even C-parity) non-Gaussian correction on the color charge density to the MV model ("quartic" term) in SU(2) and SU(3) color group in the non-perturbative regime. We compare our (numerical) non-perturbative results to (analytical) perturbative ones in the limit of small or large non-Gaussian fluctuations. The couplings in the non-Gaussian action, $\bar\mu$ for the quadratic and $\kappa_4$ for the quartic term, need to be renormalized in order to match the two-point function in the Gaussian theory. We investigate three different choices for the renormalization of these couplings: i) $\kappa_{4}$ is proportional to a power of $\bar\mu$; ii) $\kappa_4$ is kept constant and iii) $\bar\mu$ is kept constant. We find that the first two choices lead to a scenario where the small-$x$ action evolves towards a theory dominated by large non-Gaussian fluctuations, regardless of the system size, while the last one allows for controlling the deviations from the MV model.
|
2207.10956
|
Felix Wilsch
|
Felix Wilsch
|
Towards matching effective theories efficiently
|
Contribution to the proceedings of "La Thuile 2022, Les Rencontres de
Physique de la Vall\'ee d'Aoste", 6-12 March 2022
| null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
Separation of scales in quantum field theories is essential when studying the
low-energy phenomenology of a given UV model. To this end, it is necessary to
construct an effective field theory containing only the light degrees of
freedom and matching it to the full theory, ensuring that both describe the
same low-energy dynamics. Performing this matching beyond the leading order is
crucial, as a great number of observables, like FCNC, only appear at the loop
level in the Standard Model and in many new physics scenarios. One possibility
to obtain the low-energy theory is by integrating out the heavy particles from
the full theory using path integral techniques. We review this functional
matching procedure at the one-loop level and discuss common challenges involved
in determining the matching conditions for effective theories. Due to the great
diversity of beyond the Standard Model theories and the complexity of the
matching computations, an automation of this procedure is desirable. On this
matter, we present the ongoing effort to develop the Mathematica package
Matchete facilitating the fully automatic matching for a broad range of
theories. When completed, this will significantly simplify the analysis of the
low-energy phenomenology of beyond the Standard Model physics. These
proceedings are based on arXiv:2012.08506 and work in progress.
|
[
{
"created": "Fri, 22 Jul 2022 09:11:38 GMT",
"version": "v1"
}
] |
2022-07-25
|
[
[
"Wilsch",
"Felix",
""
]
] |
Separation of scales in quantum field theories is essential when studying the low-energy phenomenology of a given UV model. To this end, it is necessary to construct an effective field theory containing only the light degrees of freedom and matching it to the full theory, ensuring that both describe the same low-energy dynamics. Performing this matching beyond the leading order is crucial, as a great number of observables, like FCNC, only appear at the loop level in the Standard Model and in many new physics scenarios. One possibility to obtain the low-energy theory is by integrating out the heavy particles from the full theory using path integral techniques. We review this functional matching procedure at the one-loop level and discuss common challenges involved in determining the matching conditions for effective theories. Due to the great diversity of beyond the Standard Model theories and the complexity of the matching computations, an automation of this procedure is desirable. On this matter, we present the ongoing effort to develop the Mathematica package Matchete facilitating the fully automatic matching for a broad range of theories. When completed, this will significantly simplify the analysis of the low-energy phenomenology of beyond the Standard Model physics. These proceedings are based on arXiv:2012.08506 and work in progress.
|
hep-ph/0005009
|
Koichi Yoshioka
|
Tatsuo Kobayashi and Koichi Yoshioka
|
Infrared alignment of SUSY flavor structures
|
18 pages, 1 figure
|
Phys.Rev.D62:115003,2000
|
10.1103/PhysRevD.62.115003
|
KUNS-1659, YITP-00-19
|
hep-ph
| null |
The various experimental bounds on flavor-changing interactions severely
restrict the low-energy flavor structures of soft supersymmetry breaking
parameters. In this work, we show that with a particular assumption of Yukawa
couplings, the fermion mass and sfermion soft mass matrices are simultaneously
diagonalized by common mixing matrices and we then obtain an alignment solution
for the flavor problems. The required condition is generated by renormalization
group evolutions and achieved at low-energy scale independently of high-energy
structures of couplings. In this case, the diagonal entries of the soft scalar
mass matrices are determined by gaugino and Higgs soft masses. We also discuss
possible realizations of this scenario and the characteristic sparticle
spectrum in the models.
|
[
{
"created": "Mon, 1 May 2000 11:54:30 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Aug 2000 06:14:31 GMT",
"version": "v2"
}
] |
2014-11-17
|
[
[
"Kobayashi",
"Tatsuo",
""
],
[
"Yoshioka",
"Koichi",
""
]
] |
The various experimental bounds on flavor-changing interactions severely restrict the low-energy flavor structures of soft supersymmetry breaking parameters. In this work, we show that with a particular assumption of Yukawa couplings, the fermion mass and sfermion soft mass matrices are simultaneously diagonalized by common mixing matrices and we then obtain an alignment solution for the flavor problems. The required condition is generated by renormalization group evolutions and achieved at low-energy scale independently of high-energy structures of couplings. In this case, the diagonal entries of the soft scalar mass matrices are determined by gaugino and Higgs soft masses. We also discuss possible realizations of this scenario and the characteristic sparticle spectrum in the models.
|
hep-ph/0011034
|
Jiri Hosek
|
Jiri Hosek
|
Anisotropic color superconductor
|
5 pages, talk given at ICHEP 2000 in parallel session "High Energy
Heavy Ion Collisions", July 27 - August 2, 2000, Osaka, Japan
| null | null | null |
hep-ph
| null |
We argue that the QCD matter not far above a critical
confinement-deconfinement baryon density and low temperatures can develop
spontaneously the condensates of spin-one quark Cooper pairs. Depending upon
their color these condensates characterize two distinct anisotropic
color-superconducting phases. For them we derive the generic form of the
quasiquark dispersion laws and the gap equation. We also visualize the soft
Nambu-Goldstone modes of spontaneously broken global symmetries, and
demonstrate an unusual form of the Meissner effect.}]
|
[
{
"created": "Thu, 2 Nov 2000 14:30:33 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Hosek",
"Jiri",
""
]
] |
We argue that the QCD matter not far above a critical confinement-deconfinement baryon density and low temperatures can develop spontaneously the condensates of spin-one quark Cooper pairs. Depending upon their color these condensates characterize two distinct anisotropic color-superconducting phases. For them we derive the generic form of the quasiquark dispersion laws and the gap equation. We also visualize the soft Nambu-Goldstone modes of spontaneously broken global symmetries, and demonstrate an unusual form of the Meissner effect.}]
|
1003.3943
|
Viacheslav Kudryavtsev
|
V.A.Kudryavtsev (Petersburg Nuclear Physics Institute)
|
Hadron vertices in composite superstring model
|
15 pages, 2 figures, report at HS09 conference (Tatranska Strba,
Slovakia)
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Hadron vertices for u, d, s quark flavours are formulated in terms of
interacting composite strings. The vertices for emission of pi, K mesons and
nucleons are presented.
|
[
{
"created": "Sat, 20 Mar 2010 17:52:24 GMT",
"version": "v1"
}
] |
2010-03-23
|
[
[
"Kudryavtsev",
"V. A.",
"",
"Petersburg Nuclear Physics Institute"
]
] |
Hadron vertices for u, d, s quark flavours are formulated in terms of interacting composite strings. The vertices for emission of pi, K mesons and nucleons are presented.
|
1905.13116
|
Mario Reig
|
Andrea Caputo, Mario Reig
|
Cosmic implications of a low-scale solution to the axion domain wall
problem
|
12 pages, 4 figures; matches published version
|
Phys. Rev. D 100, 063530 (2019)
|
10.1103/PhysRevD.100.063530
|
IFIC/19-29
|
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The post-inflationary breaking of Peccei-Quinn (PQ) symmetry can lead to the
cosmic domain wall catastrophe. In this Letter we show how to avoid domain
walls implementing the Instanton Interference Effect (IIE) with a new
interaction which itself breaks PQ symmetry and confines at an energy scale
smaller than $\Lambda_{QCD}$. We give a general description of the mechanism
and consider its cosmological implications and constraints within a minimal
model. Contrary to other mechanisms we do not require an inverse phase
transition neither fine-tuned bias terms. Incidentally, the mechanism leads to
the introduction of new self-interacting dark matter candidates and the
possibility of producing gravitational waves in the frequency range of SKA.
Unless a fine-tuned hidden sector is introduced, the mechanism predicts a QCD
axion in the mass range $1\text{ meV}-15\text{ meV}$.
|
[
{
"created": "Thu, 30 May 2019 15:46:31 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Sep 2019 00:33:13 GMT",
"version": "v2"
}
] |
2019-10-02
|
[
[
"Caputo",
"Andrea",
""
],
[
"Reig",
"Mario",
""
]
] |
The post-inflationary breaking of Peccei-Quinn (PQ) symmetry can lead to the cosmic domain wall catastrophe. In this Letter we show how to avoid domain walls implementing the Instanton Interference Effect (IIE) with a new interaction which itself breaks PQ symmetry and confines at an energy scale smaller than $\Lambda_{QCD}$. We give a general description of the mechanism and consider its cosmological implications and constraints within a minimal model. Contrary to other mechanisms we do not require an inverse phase transition neither fine-tuned bias terms. Incidentally, the mechanism leads to the introduction of new self-interacting dark matter candidates and the possibility of producing gravitational waves in the frequency range of SKA. Unless a fine-tuned hidden sector is introduced, the mechanism predicts a QCD axion in the mass range $1\text{ meV}-15\text{ meV}$.
|
2007.11493
|
Marco Cirelli
|
Marco Cirelli, Nicolao Fornengo, Bradley J. Kavanagh, Elena Pinetti
|
Integral X-ray constraints on sub-GeV Dark Matter
|
16 pp+refs, 7 figs. v2: added comments on radiative decays and
positron in-flight annihilation. Results unchanged. v3: comments added, on
astrophysical uncertainties, on more aggressive bounds including background
and on justifying adopted approximations. Results unchanged. v4: figure on
astrophysical uncertainties added. Matches PRD version. v5: typo in the units
of plots in fig. 2 and 3 fixed
|
Phys. Rev. D 103, 063022 (2021)
|
10.1103/PhysRevD.103.063022
| null |
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Light Dark Matter (DM), defined here as having a mass between 1 MeV and about
1 GeV, is an interesting possibility both theoretically and phenomenologically,
at one of the frontiers of current progress in the field of DM searches. Its
indirect detection via gamma-rays is challenged by the scarcity of experiments
in the MeV-GeV region. We look therefore at lower-energy X-ray data from the
Integral telescope, and compare them with the predicted DM flux. We derive
bounds which are competitive with existing ones from other techniques.
Crucially, we include the contribution from inverse Compton scattering on
galactic radiation fields and the CMB, which leads to much stronger constraints
than in previous studies for DM masses above 20 MeV.
|
[
{
"created": "Wed, 22 Jul 2020 15:33:34 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Sep 2020 08:59:13 GMT",
"version": "v2"
},
{
"created": "Wed, 23 Dec 2020 13:31:10 GMT",
"version": "v3"
},
{
"created": "Wed, 2 Jun 2021 12:56:37 GMT",
"version": "v4"
},
{
"created": "Tue, 5 Jul 2022 08:06:13 GMT",
"version": "v5"
}
] |
2022-07-06
|
[
[
"Cirelli",
"Marco",
""
],
[
"Fornengo",
"Nicolao",
""
],
[
"Kavanagh",
"Bradley J.",
""
],
[
"Pinetti",
"Elena",
""
]
] |
Light Dark Matter (DM), defined here as having a mass between 1 MeV and about 1 GeV, is an interesting possibility both theoretically and phenomenologically, at one of the frontiers of current progress in the field of DM searches. Its indirect detection via gamma-rays is challenged by the scarcity of experiments in the MeV-GeV region. We look therefore at lower-energy X-ray data from the Integral telescope, and compare them with the predicted DM flux. We derive bounds which are competitive with existing ones from other techniques. Crucially, we include the contribution from inverse Compton scattering on galactic radiation fields and the CMB, which leads to much stronger constraints than in previous studies for DM masses above 20 MeV.
|
1010.1552
|
Carlos Louren\c{c}o
|
Pietro Faccioli, Carlos Lourenco, Joao Seixas and Hermine K. Woehri
|
Rotation-invariant observables in parity-violating decays of vector
particles to fermion pairs
|
To be published in Phys. Rev. D
|
Phys.Rev.D82:096002,2010
|
10.1103/PhysRevD.82.096002
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The di-fermion angular distribution observed in decays of inclusively
produced vector particles is characterized by two frame-independent
observables, reflecting the average spin-alignment of the produced particle and
the magnitude of parity violation in the decay. The existence of these
observables derives from the rotational properties of angular momentum
eigenstates and is a completely general result, valid for any J=1 state and
independent of the production process. Rotation-invariant formulations of
polarization and of the decay parity-asymmetry can provide more significant
measurements than the commonly used frame-dependent definitions, also improving
the quality of the comparisons between the measurements and the theoretical
calculations.
|
[
{
"created": "Thu, 7 Oct 2010 21:33:08 GMT",
"version": "v1"
}
] |
2010-11-11
|
[
[
"Faccioli",
"Pietro",
""
],
[
"Lourenco",
"Carlos",
""
],
[
"Seixas",
"Joao",
""
],
[
"Woehri",
"Hermine K.",
""
]
] |
The di-fermion angular distribution observed in decays of inclusively produced vector particles is characterized by two frame-independent observables, reflecting the average spin-alignment of the produced particle and the magnitude of parity violation in the decay. The existence of these observables derives from the rotational properties of angular momentum eigenstates and is a completely general result, valid for any J=1 state and independent of the production process. Rotation-invariant formulations of polarization and of the decay parity-asymmetry can provide more significant measurements than the commonly used frame-dependent definitions, also improving the quality of the comparisons between the measurements and the theoretical calculations.
|
2402.09535
|
Zoltan Ligeti
|
Zoltan Ligeti
|
On magnitudes of some CKM matrix elements
|
12 pages, Talk given at the KM50 Symposium, KEK, Tsukuba, February
2023 (https://www-conf.kek.jp/KM50/), published version
| null | null | null |
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
This writeup follows the presentation at the Symposium, with emphasis on
topics and ideas discussed there. It is purposefully informal, not a review of
the field, and neither does it include a complete list of references. However,
I hope that readers might find some comments useful or amusing, and may
appreciate the challenges and reasons for excitement about recent progress and
future opportunities in flavor physics.
|
[
{
"created": "Wed, 14 Feb 2024 19:25:00 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Apr 2024 06:37:44 GMT",
"version": "v2"
}
] |
2024-04-12
|
[
[
"Ligeti",
"Zoltan",
""
]
] |
This writeup follows the presentation at the Symposium, with emphasis on topics and ideas discussed there. It is purposefully informal, not a review of the field, and neither does it include a complete list of references. However, I hope that readers might find some comments useful or amusing, and may appreciate the challenges and reasons for excitement about recent progress and future opportunities in flavor physics.
|
hep-ph/0112363
|
Vladimir Zoller
|
V. R. Zoller (ITEP, Moscow)
|
Coherent Coulomb excitation of relativistic nuclei in aligned crystal
targets
|
7 pages
|
JETP Lett. 75 (2002) 119-122; Pisma Zh.Eksp.Teor.Fiz. 75 (2002)
147-150
|
10.1134/1.1469495
|
FZ IKP(TH)-2001-25
|
hep-ph hep-ex nucl-ex nucl-th
| null |
We study coherent Coulomb excitation of ultrarelativistic nuclei passing
through the aligned crystal target. We develop multiple scattering theory
description of this process which consistently incorporates both the specific
resonant properties of particle-crystal interactions and the shadowing effect
typical of the diffractive scattering. We emphasise that the effect of quantum
mechanical diffraction makes the physics of ultrarelativistic nuclear
excitations entirely different from the physics of non-relativistic atomic
excitations experimentally studied so far. It is found that at small transverse
momenta $q_{\perp}$ the shadowing effect drastically changes the dependence of
coherent amplitudes on the crystal thickness $L$, from the widely discussed
growth $\propto L$ typical of the Born approximation to the inverse thickness
attenuation law. At relatively large $q_{\perp}$ no attenuation effect is found
but the coherency condition is shown to put stringent constrain on the growth
of the transition rate with growing $L$.
|
[
{
"created": "Mon, 31 Dec 2001 13:25:18 GMT",
"version": "v1"
},
{
"created": "Sun, 6 Jan 2002 14:36:49 GMT",
"version": "v2"
}
] |
2009-11-07
|
[
[
"Zoller",
"V. R.",
"",
"ITEP, Moscow"
]
] |
We study coherent Coulomb excitation of ultrarelativistic nuclei passing through the aligned crystal target. We develop multiple scattering theory description of this process which consistently incorporates both the specific resonant properties of particle-crystal interactions and the shadowing effect typical of the diffractive scattering. We emphasise that the effect of quantum mechanical diffraction makes the physics of ultrarelativistic nuclear excitations entirely different from the physics of non-relativistic atomic excitations experimentally studied so far. It is found that at small transverse momenta $q_{\perp}$ the shadowing effect drastically changes the dependence of coherent amplitudes on the crystal thickness $L$, from the widely discussed growth $\propto L$ typical of the Born approximation to the inverse thickness attenuation law. At relatively large $q_{\perp}$ no attenuation effect is found but the coherency condition is shown to put stringent constrain on the growth of the transition rate with growing $L$.
|
1107.4461
|
Lei Guo
|
Wei Hong-Tang, Zhang Ren-You, Guo Lei, Han Liang, Ma Wen-Gan, Li
Xiao-Peng and Wang Ting-Ting
|
Probe R-parity violating stop resonance at the LHeC
|
9 pages, 8 figures
|
JHEP 1107:003,2011
|
10.1007/JHEP07(2011)003
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the possibility of detecting single sqaurk production at the
proposed LHeC collider, in the framework of R-parity violating supersymmetry.
Taking advantage of the enhancement of the direct resonance production of
squark and the distinctive kinematics distributions of $\tilde{q}\rightarrow l
q$ two body decay final states, the LHeC provides excellent opportunities of
probing R-violating $\hat{L}\hat{Q}\hat{D}$ interactions at unprecedented level
compared to all the knowledge derived from indirect low energy nucleon
measurements. If no apparent deviation from SM predictions on high invariant
mass of muon and b-quark final states at the LHeC with 1$fb^{-1}$ data, the
sensitivities on $\hat{L}\hat{Q}\hat{D}$ coupling constant $\lambda^{'}_{131}
\times \lambda^{'}_{233}$ can be improved by nearly four orders, at energy
scale about 100 GeV.
|
[
{
"created": "Fri, 22 Jul 2011 09:22:37 GMT",
"version": "v1"
},
{
"created": "Sun, 13 Jan 2013 08:46:57 GMT",
"version": "v2"
}
] |
2013-01-15
|
[
[
"Hong-Tang",
"Wei",
""
],
[
"Ren-You",
"Zhang",
""
],
[
"Lei",
"Guo",
""
],
[
"Liang",
"Han",
""
],
[
"Wen-Gan",
"Ma",
""
],
[
"Xiao-Peng",
"Li",
""
],
[
"Ting-Ting",
"Wang",
""
]
] |
We investigate the possibility of detecting single sqaurk production at the proposed LHeC collider, in the framework of R-parity violating supersymmetry. Taking advantage of the enhancement of the direct resonance production of squark and the distinctive kinematics distributions of $\tilde{q}\rightarrow l q$ two body decay final states, the LHeC provides excellent opportunities of probing R-violating $\hat{L}\hat{Q}\hat{D}$ interactions at unprecedented level compared to all the knowledge derived from indirect low energy nucleon measurements. If no apparent deviation from SM predictions on high invariant mass of muon and b-quark final states at the LHeC with 1$fb^{-1}$ data, the sensitivities on $\hat{L}\hat{Q}\hat{D}$ coupling constant $\lambda^{'}_{131} \times \lambda^{'}_{233}$ can be improved by nearly four orders, at energy scale about 100 GeV.
|
hep-ph/9408349
| null |
J. Rosner (University of Chicago)
|
Status of the Standard Model
|
27 Pages, LaTeX, uses file world_sci.sty (appended); 10 PostScript
figures (uuencoded) in separate file. August, 1994, Enrico Fermi Institute
report EFI 94-38
| null | null | null |
hep-ph
| null |
The standard model of electroweak interactions is reviewed, stressing the top
quark's impact on precision tests and on determination of parameters of the
Cabibbo-Kobayashi-Maskawa (CKM) matrix. Some opportunities for the study of CP
violation in the decays of $b$-flavored mesons are mentioned, and the
possibility of a new ``standard model'' sector involving neutrino masses is
discussed.
|
[
{
"created": "Mon, 22 Aug 1994 21:28:19 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Aug 1994 11:34:45 GMT",
"version": "v2"
}
] |
2009-09-25
|
[
[
"Rosner",
"J.",
"",
"University of Chicago"
]
] |
The standard model of electroweak interactions is reviewed, stressing the top quark's impact on precision tests and on determination of parameters of the Cabibbo-Kobayashi-Maskawa (CKM) matrix. Some opportunities for the study of CP violation in the decays of $b$-flavored mesons are mentioned, and the possibility of a new ``standard model'' sector involving neutrino masses is discussed.
|
1102.2582
|
Vladimir Vechernin
|
V. V. Vechernin and H. S. Nguyen
|
Fluctuations of the number of participants and binary collisions in AA
interactions at fixed centrality in the Glauber approach
|
updated version; as published by Phys. Rev. C
|
Phys.Rev.C84:054909,2011
|
10.1103/PhysRevC.84.054909
|
SPbU-IP-09-06
|
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In the framework of the classical Glauber approach, the analytical
expressions for the variance of the number of wounded nucleons and binary
collisions in AA interactions at a given centrality are presented. Along with
the optical approximation term, they contain additional contact terms arising
only in the case of nucleus-nucleus collisions. The magnitude of the additional
contributions, e.g., for PbPb collisions at SPS energies, is larger than the
contribution of the optical approximation at some values of the impact
parameter. The sum of the additional contributions is in good agreement with
the results of independent Monte Carlo simulations of this process. Due to
these additional terms, the variance of the total number of participants for
peripheral PbPb collisions and the variance of the number of collisions at all
values of the impact parameter exceed several multiples of the Poisson
variances. The correlator between the numbers of participants in colliding
nuclei at fixed centrality is also analytically calculated.
|
[
{
"created": "Sun, 13 Feb 2011 11:55:55 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Mar 2012 09:12:24 GMT",
"version": "v2"
}
] |
2012-03-14
|
[
[
"Vechernin",
"V. V.",
""
],
[
"Nguyen",
"H. S.",
""
]
] |
In the framework of the classical Glauber approach, the analytical expressions for the variance of the number of wounded nucleons and binary collisions in AA interactions at a given centrality are presented. Along with the optical approximation term, they contain additional contact terms arising only in the case of nucleus-nucleus collisions. The magnitude of the additional contributions, e.g., for PbPb collisions at SPS energies, is larger than the contribution of the optical approximation at some values of the impact parameter. The sum of the additional contributions is in good agreement with the results of independent Monte Carlo simulations of this process. Due to these additional terms, the variance of the total number of participants for peripheral PbPb collisions and the variance of the number of collisions at all values of the impact parameter exceed several multiples of the Poisson variances. The correlator between the numbers of participants in colliding nuclei at fixed centrality is also analytically calculated.
|
hep-ph/9606304
|
Kim Jeongdae
|
J.D. Kim, C.W. Kim, Jewan Kim and Dae-Gyu Lee
|
Medium Effects on the CP phases and Dynamical Mixing Angles in the
Neutrino Mixing Matrix
|
17 pages with 4 figures included, ReVTeX
| null | null |
SNUTP 96-059, KAIST-TP 96/10
|
hep-ph
| null |
The concepts of effective and dynamical neutrino mixing matrices are
introduced in order to describe the behavior of neutrinos in matter. The former
relates weak eigenstates to mass eigenstates, whereas the latter relates weak
eigenstates to energy eigenstates in matter. It is shown that the dynamical
mixing angles enable us to express the neutrino survival probability in the Sun
without any resort to the Landau-Zener transition probability for the
non-adiabatic process. Also discussed are effective CP violating phases that
appear in the effective and dynamical mixing matrices in matter. Both two and
three generation cases are discussed using the solar neutrinos as an example.
|
[
{
"created": "Wed, 12 Jun 1996 11:39:08 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Kim",
"J. D.",
""
],
[
"Kim",
"C. W.",
""
],
[
"Kim",
"Jewan",
""
],
[
"Lee",
"Dae-Gyu",
""
]
] |
The concepts of effective and dynamical neutrino mixing matrices are introduced in order to describe the behavior of neutrinos in matter. The former relates weak eigenstates to mass eigenstates, whereas the latter relates weak eigenstates to energy eigenstates in matter. It is shown that the dynamical mixing angles enable us to express the neutrino survival probability in the Sun without any resort to the Landau-Zener transition probability for the non-adiabatic process. Also discussed are effective CP violating phases that appear in the effective and dynamical mixing matrices in matter. Both two and three generation cases are discussed using the solar neutrinos as an example.
|
1809.07765
|
Seung-il Nam
|
Jung Keun Ahn, Seung-il Nam
|
$\Xi(1690)^-$ production in the $K^-p\to K^+K^-\Lambda$ reaction process
near threshold
|
8 pages, 8 figures, Accepted for publication via Phys.Rev.D
|
Phys. Rev. D 98, 114012 (2018)
|
10.1103/PhysRevD.98.114012
| null |
hep-ph hep-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate $\Xi(1690)^-$ production from the $K^-p\to K^+K^-\Lambda$
reaction within the effective Lagrangian approach at the tree-level Born
approximation. We consider the $s$- and $u$-channel $\Sigma/\Lambda$ ground
states and resonances for the $\Xi$-pole contributions, in addition to the
$s$-channel $\Lambda$, $u$-channel nucleon pole, and $t$-channel $K^-$-exchange
for the $\phi$-pole contributions. The $\Xi$-pole includes $\Xi(1320)$,
$\Xi(1535)$, $\Xi(1690)(J^p=1/2^-)$,and $\Xi(1820)(J^p=3/2^-)$. We calculate
the Dalitz plot density of $(d^2\sigma/dM_{K^+K^-}dM_{K^-\Lambda}$ at 4.2
GeV$/c$) and the total cross sections for the $K^-p\to K^+K^-\Lambda$ reaction
near the threshold. The calculation results are in good agreement with
previously acquired experimental data. Using the parameters from the fit, we
present the total and differential cross sections for the two-body $K^-p\to
K^+\Xi(1690)^-$ reaction near the threshold. In our calculation, a strong
enhancement at backward $K^+$ angles is predicted because of the dominant
$u$-channel contribution. We also demonstrate that the Dalitz plot analysis for
$p_{K^-}=1.915 -- 2.065$ GeV/c enables us to access direct information
regarding $\Xi(1690)^-$ production, which can be tested by future $K^-$ beam
experiments. The possible spin-parity states of $\Xi(1690)^-$ are briefly
discussed as well.
|
[
{
"created": "Thu, 20 Sep 2018 12:31:04 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Nov 2018 01:54:35 GMT",
"version": "v2"
}
] |
2018-12-19
|
[
[
"Ahn",
"Jung Keun",
""
],
[
"Nam",
"Seung-il",
""
]
] |
We investigate $\Xi(1690)^-$ production from the $K^-p\to K^+K^-\Lambda$ reaction within the effective Lagrangian approach at the tree-level Born approximation. We consider the $s$- and $u$-channel $\Sigma/\Lambda$ ground states and resonances for the $\Xi$-pole contributions, in addition to the $s$-channel $\Lambda$, $u$-channel nucleon pole, and $t$-channel $K^-$-exchange for the $\phi$-pole contributions. The $\Xi$-pole includes $\Xi(1320)$, $\Xi(1535)$, $\Xi(1690)(J^p=1/2^-)$,and $\Xi(1820)(J^p=3/2^-)$. We calculate the Dalitz plot density of $(d^2\sigma/dM_{K^+K^-}dM_{K^-\Lambda}$ at 4.2 GeV$/c$) and the total cross sections for the $K^-p\to K^+K^-\Lambda$ reaction near the threshold. The calculation results are in good agreement with previously acquired experimental data. Using the parameters from the fit, we present the total and differential cross sections for the two-body $K^-p\to K^+\Xi(1690)^-$ reaction near the threshold. In our calculation, a strong enhancement at backward $K^+$ angles is predicted because of the dominant $u$-channel contribution. We also demonstrate that the Dalitz plot analysis for $p_{K^-}=1.915 -- 2.065$ GeV/c enables us to access direct information regarding $\Xi(1690)^-$ production, which can be tested by future $K^-$ beam experiments. The possible spin-parity states of $\Xi(1690)^-$ are briefly discussed as well.
|
hep-ph/0510287
|
Elzbieta Nowak-Kubat
|
Henryk Czyz, Elzbieta Nowak-Kubat
|
Radiative return via electron pair production: Monte Carlo simulation of
the process e+ e- --> pi+ pi- e+ e-
| null |
Acta Phys.Polon. B36 (2005) 3425-3434
| null | null |
hep-ph
| null |
Contributions from the reaction e+e- --> pi+pi- e+e- to the pion form factor
measurement via radiative return method are discussed basing on the results of
a Monte Carlo generator (EKHARA). The generator contains contributions from the
initial and final state emission of a e+e- pair from e+e- --> pi+pi- production
diagrams and the pi+pi- pair production from space-like and time-like Bhabha
diagrams. A detailed study is performed for the Phi- factory energy. Tests of
the generation procedure are also presented.
|
[
{
"created": "Fri, 21 Oct 2005 13:19:41 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Czyz",
"Henryk",
""
],
[
"Nowak-Kubat",
"Elzbieta",
""
]
] |
Contributions from the reaction e+e- --> pi+pi- e+e- to the pion form factor measurement via radiative return method are discussed basing on the results of a Monte Carlo generator (EKHARA). The generator contains contributions from the initial and final state emission of a e+e- pair from e+e- --> pi+pi- production diagrams and the pi+pi- pair production from space-like and time-like Bhabha diagrams. A detailed study is performed for the Phi- factory energy. Tests of the generation procedure are also presented.
|
1809.01183
|
Raymond F. Sawyer
|
R. F. Sawyer
|
Axion, photon-pair mixing in models of axion dark matter
|
6 pages. Additional material on red shift and on inhomogeneities
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A system of light axions comprising a classical axion field, one candidate
for dark matter, has an instability that would rapidly mix in photon pairs in a
coherent fashion if the system were initially seeded by some tiny amount of
such mixing. We develop equations that contain the mixing and at the same time
incorporate enough quantum mechanics to eliminate the need for seeds. Extending
to many modes brings many interesting issues to the fore. For example, the
argument of the inevitable logarithmic factor in the mixing time becomes
reduced by many orders of magnitude; concerns concerning red-shifts are laid to
rest, as are those related to lumpiness of the original axion state. We further
see that even the fully developed states of the electromagnetic field are
completely non-classical in our solutions.
|
[
{
"created": "Tue, 4 Sep 2018 18:18:40 GMT",
"version": "v1"
},
{
"created": "Tue, 18 Sep 2018 14:26:28 GMT",
"version": "v2"
},
{
"created": "Fri, 12 Oct 2018 21:21:23 GMT",
"version": "v3"
},
{
"created": "Sun, 18 Nov 2018 20:36:43 GMT",
"version": "v4"
},
{
"created": "Mon, 28 Jan 2019 20:35:23 GMT",
"version": "v5"
}
] |
2019-01-30
|
[
[
"Sawyer",
"R. F.",
""
]
] |
A system of light axions comprising a classical axion field, one candidate for dark matter, has an instability that would rapidly mix in photon pairs in a coherent fashion if the system were initially seeded by some tiny amount of such mixing. We develop equations that contain the mixing and at the same time incorporate enough quantum mechanics to eliminate the need for seeds. Extending to many modes brings many interesting issues to the fore. For example, the argument of the inevitable logarithmic factor in the mixing time becomes reduced by many orders of magnitude; concerns concerning red-shifts are laid to rest, as are those related to lumpiness of the original axion state. We further see that even the fully developed states of the electromagnetic field are completely non-classical in our solutions.
|
1811.11722
|
Stephan Jahn
|
Stephan Jahn
|
Numerical evaluation of multi-loop integrals
|
10 pages, 5 figures, contribution to the proceedings of Loops and
Legs 2018, St. Goar, Germany
| null |
10.22323/1.303.0019
|
MPP-2018-285
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present updates on the development of pySecDec, a toolbox to numerically
evaluate parameter integrals in the context of dimensional regularization. We
discuss difficulties with loop integrals in the special kinematic condition
where the squared momentum of a leg is equal to the squared mass of a
propagator. We further discuss some features of a Quasi Monte Carlo (QMC)
integrator that can optionally run on Graphics Processing Units (GPUs).
|
[
{
"created": "Wed, 28 Nov 2018 18:23:53 GMT",
"version": "v1"
}
] |
2022-09-21
|
[
[
"Jahn",
"Stephan",
""
]
] |
We present updates on the development of pySecDec, a toolbox to numerically evaluate parameter integrals in the context of dimensional regularization. We discuss difficulties with loop integrals in the special kinematic condition where the squared momentum of a leg is equal to the squared mass of a propagator. We further discuss some features of a Quasi Monte Carlo (QMC) integrator that can optionally run on Graphics Processing Units (GPUs).
|
hep-ph/0312375
|
Sannino Francesco
|
Francesco Sannino
|
Effective Lagrangians for QCD, Duality and Exact Results
|
Invited review talk for the the NATO Advanced Research Workshop,
"Superdense QCD Matter and Compact Stars", Armenia 2003
| null | null | null |
hep-ph
| null |
I briefly discuss effective Lagrangians for strong interactions while
concentrating on two specific lagrangians for QCD at large matter density. I
then introduce spectral duality in QCD a la Montonen and Olive. The latter is
already present in QCD in the hadronic phase. However it becomes transparent at
large chemical potential. Finally I show the relevance of having exact non
perturbative constraints such as t'Hooft anomaly conditions at zero and nonzero
quark chemical potential on the possible phases of strongly interacting matter.
An important outcome is that for three massless quarks at any chemical
potential the only non trivial solution of the constraints is chiral symmetry
breaking. This also shows that for three massless flavors at large quark
chemical potential CFL is the ground state.
|
[
{
"created": "Tue, 30 Dec 2003 11:58:47 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Sannino",
"Francesco",
""
]
] |
I briefly discuss effective Lagrangians for strong interactions while concentrating on two specific lagrangians for QCD at large matter density. I then introduce spectral duality in QCD a la Montonen and Olive. The latter is already present in QCD in the hadronic phase. However it becomes transparent at large chemical potential. Finally I show the relevance of having exact non perturbative constraints such as t'Hooft anomaly conditions at zero and nonzero quark chemical potential on the possible phases of strongly interacting matter. An important outcome is that for three massless quarks at any chemical potential the only non trivial solution of the constraints is chiral symmetry breaking. This also shows that for three massless flavors at large quark chemical potential CFL is the ground state.
|
2110.12992
|
Rhorry Gauld
|
R. Gauld, A. Gehrmann-De Ridder, E. W. N. Glover, A. Huss, I. Majer
|
$VH+\text{jet}$ production in hadron-hadron collisions up to order
$\alpha_s^3$ in perturbative QCD
|
33 pages, 10 figures. v2: includes some minor clarifications, updated
citations, and matches JHEP version
| null |
10.1007/JHEP03(2022)008
|
NIKHEF 2021-026, BONN-TH-2021-09, IPPP/21/26, ZU-TH 49/21,
CERN-TH-2021-159
|
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
We present precise predictions for the hadronic production of an on-shell
Higgs boson in association with a leptonically decaying gauge boson and a jet
up to order $\alpha_s^3$. We include the complete set of NNLO QCD corrections
to both charged- and neutral-current Drell-Yan type contributions, as well as
the previously known leading heavy quark loop induced contributions which
involve a direct Higgs-quark coupling. As an application, we study a range of
differential observables in proton-proton collisions at $\sqrt{s} =
13~\text{TeV}$ for both the charged- and neutral-current production modes. For
each Higgs production process, we assess the improvement in the theoretical
uncertainty for both the exclusive ($n_{\text{jet}} = 1$) and inclusive
($n_{\text{jet}} \geq 1$) jet categories. We find that the inclusion of the
NNLO corrections to the Drell-Yan type contributions is essential in
stabilising the predictions and in reducing the theoretical uncertainty for
both inclusive and exclusive jet production for all three modes. This is
particularly true in the kinematical regimes associated with low to medium
values of the transverse momentum of the produced vector boson and where the
differential cross sections are the largest. For the neutral-current process,
we find that the heavy quark loop induced contributions have their largest
phenomenological impact (an increase in the size of the NNLO corrections, a
distortion of the distribution shape and an enlargement of the left over
remaining uncertainties) in kinematical regions associated to large values of
$p_{T,Z}$ (typically above $150~\text{GeV}$) where the cross sections are
smaller.
|
[
{
"created": "Mon, 25 Oct 2021 14:34:30 GMT",
"version": "v1"
},
{
"created": "Fri, 25 Mar 2022 10:22:27 GMT",
"version": "v2"
}
] |
2022-03-28
|
[
[
"Gauld",
"R.",
""
],
[
"Ridder",
"A. Gehrmann-De",
""
],
[
"Glover",
"E. W. N.",
""
],
[
"Huss",
"A.",
""
],
[
"Majer",
"I.",
""
]
] |
We present precise predictions for the hadronic production of an on-shell Higgs boson in association with a leptonically decaying gauge boson and a jet up to order $\alpha_s^3$. We include the complete set of NNLO QCD corrections to both charged- and neutral-current Drell-Yan type contributions, as well as the previously known leading heavy quark loop induced contributions which involve a direct Higgs-quark coupling. As an application, we study a range of differential observables in proton-proton collisions at $\sqrt{s} = 13~\text{TeV}$ for both the charged- and neutral-current production modes. For each Higgs production process, we assess the improvement in the theoretical uncertainty for both the exclusive ($n_{\text{jet}} = 1$) and inclusive ($n_{\text{jet}} \geq 1$) jet categories. We find that the inclusion of the NNLO corrections to the Drell-Yan type contributions is essential in stabilising the predictions and in reducing the theoretical uncertainty for both inclusive and exclusive jet production for all three modes. This is particularly true in the kinematical regimes associated with low to medium values of the transverse momentum of the produced vector boson and where the differential cross sections are the largest. For the neutral-current process, we find that the heavy quark loop induced contributions have their largest phenomenological impact (an increase in the size of the NNLO corrections, a distortion of the distribution shape and an enlargement of the left over remaining uncertainties) in kinematical regions associated to large values of $p_{T,Z}$ (typically above $150~\text{GeV}$) where the cross sections are smaller.
|
1011.6124
|
Weizhen Deng
|
Chun Yang, Bao-Fei Li, Xiao-Lin Chen and Wei-Zhen Deng
|
Fine Splitting in Charmonium Spectrum with Channel Coupling Effect
|
Submitted to Chinese Physics C
|
Chin.Phys.C35:797-803,2011
|
10.1088/1674-1137/35/9/001
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the fine splitting in charmonium spectrum in quark model with the
channel coupling effect, including $DD$, $DD^*$, $D^*D^*$ and $D_sD_s$,
$D_sD_s^*$, $D_s^*D_s^*$ channels. The interaction for channel coupling is
constructed from the current-current Lagrangian related to the color
confinement and the one-gluon exchange potentials. By adopting the massive
gluon propagator from the lattice calculation in the nonperturbative region,
the coupling interaction is further simplified to the four-fermion interaction.
The numerical calculation still prefers the assignment $1^{++}$ of X(3872).
|
[
{
"created": "Mon, 29 Nov 2010 03:42:37 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Dec 2010 09:17:20 GMT",
"version": "v2"
}
] |
2011-09-23
|
[
[
"Yang",
"Chun",
""
],
[
"Li",
"Bao-Fei",
""
],
[
"Chen",
"Xiao-Lin",
""
],
[
"Deng",
"Wei-Zhen",
""
]
] |
We study the fine splitting in charmonium spectrum in quark model with the channel coupling effect, including $DD$, $DD^*$, $D^*D^*$ and $D_sD_s$, $D_sD_s^*$, $D_s^*D_s^*$ channels. The interaction for channel coupling is constructed from the current-current Lagrangian related to the color confinement and the one-gluon exchange potentials. By adopting the massive gluon propagator from the lattice calculation in the nonperturbative region, the coupling interaction is further simplified to the four-fermion interaction. The numerical calculation still prefers the assignment $1^{++}$ of X(3872).
|
hep-ph/9711375
|
Chi-Keung Chow
|
Chi-Keung Chow (Cornell)
|
Aspects of Quenched Chiral Perturbation Theory for Matter Fields
|
22 pages in REVTeX, 4 figures
|
Phys.Rev. D57 (1998) 6762-6770
|
10.1103/PhysRevD.57.6762
|
CLNS 97/1525
|
hep-ph hep-lat
| null |
Three topics about the application of quenched chiral perturbation theory to
matter fields are studied. It is proved that the hairpin axial current
couplings in quenched chiral perturbation theories do not contribute to the
quenched chiral singularities for one chiral loop renormalization of matter
field properties. The modification of mass corrections in the chiral limit due
to nonzero mass splittings are studied, and selection rules for hadron decays
in quenched QCD are obtained.
|
[
{
"created": "Tue, 18 Nov 1997 20:41:32 GMT",
"version": "v1"
}
] |
2009-10-30
|
[
[
"Chow",
"Chi-Keung",
"",
"Cornell"
]
] |
Three topics about the application of quenched chiral perturbation theory to matter fields are studied. It is proved that the hairpin axial current couplings in quenched chiral perturbation theories do not contribute to the quenched chiral singularities for one chiral loop renormalization of matter field properties. The modification of mass corrections in the chiral limit due to nonzero mass splittings are studied, and selection rules for hadron decays in quenched QCD are obtained.
|
1611.05065
|
Jonathan Cornell
|
Jonathan M. Cornell (for the GAMBIT collaboration)
|
Global fits of scalar singlet dark matter with GAMBIT
|
7 pages, 2 figures. Contribution to proceedings of ICHEP 2016. v2:
References added
| null |
10.22323/1.282.0118
|
gambit-proceedings-2016
|
hep-ph astro-ph.HE hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The wide range of probes of physics beyond the standard model leads to the
need for tools that combine experimental results to make the most robust
possible statements about the validity of theories and the preferred regions of
their parameter space. Here we introduce a new code for such analyses: GAMBIT,
the Global and Modular BSM Inference Tool. GAMBIT is a flexible and extensible
framework for global fits of essentially any BSM theory. The code currently
incorporates direct and indirect searches for dark matter, limits on production
of new particles from the LHC and LEP, complete flavor constraints from LHCb,
LHC Higgs production and decay measurements, and various electroweak precision
observables. Here we present an overview of the code's capabilities, followed
by preliminary results from scans of the scalar singlet dark matter model.
|
[
{
"created": "Tue, 15 Nov 2016 21:28:05 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Dec 2016 01:27:49 GMT",
"version": "v2"
}
] |
2022-09-21
|
[
[
"Cornell",
"Jonathan M.",
"",
"for the GAMBIT collaboration"
]
] |
The wide range of probes of physics beyond the standard model leads to the need for tools that combine experimental results to make the most robust possible statements about the validity of theories and the preferred regions of their parameter space. Here we introduce a new code for such analyses: GAMBIT, the Global and Modular BSM Inference Tool. GAMBIT is a flexible and extensible framework for global fits of essentially any BSM theory. The code currently incorporates direct and indirect searches for dark matter, limits on production of new particles from the LHC and LEP, complete flavor constraints from LHCb, LHC Higgs production and decay measurements, and various electroweak precision observables. Here we present an overview of the code's capabilities, followed by preliminary results from scans of the scalar singlet dark matter model.
|
hep-ph/0007109
|
Mikko Laine
|
K. Kajantie, M. Laine, K. Rummukainen, Y. Schroder
|
How to resum long-distance contributions to the QCD pressure?
|
4 pages; small clarifications added; to appear in PRL
|
Phys.Rev.Lett. 86 (2001) 10-13
|
10.1103/PhysRevLett.86.10
| null |
hep-ph hep-lat
| null |
The strict coupling constant expansion for the free energy of hot QCD plasma
shows bad convergence at all reasonable temperatures, and does not agree well
with its 4d lattice determination. This has recently lead to various refined
resummations, whereby the agreement with the lattice result should improve, at
the cost of a loss of a formal agreement with the coupling constant expansion
and particularly with its large infrared sensitive ``long-distance''
contributions. We show here how to resum the dominant long-distance effects by
using a 3d effective field theory, and determine their magnitude by simple
lattice Monte Carlo simulations.
|
[
{
"created": "Wed, 12 Jul 2000 15:05:46 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Nov 2000 11:42:32 GMT",
"version": "v2"
}
] |
2009-10-31
|
[
[
"Kajantie",
"K.",
""
],
[
"Laine",
"M.",
""
],
[
"Rummukainen",
"K.",
""
],
[
"Schroder",
"Y.",
""
]
] |
The strict coupling constant expansion for the free energy of hot QCD plasma shows bad convergence at all reasonable temperatures, and does not agree well with its 4d lattice determination. This has recently lead to various refined resummations, whereby the agreement with the lattice result should improve, at the cost of a loss of a formal agreement with the coupling constant expansion and particularly with its large infrared sensitive ``long-distance'' contributions. We show here how to resum the dominant long-distance effects by using a 3d effective field theory, and determine their magnitude by simple lattice Monte Carlo simulations.
|
1306.6879
|
Vinzenz Maurer
|
Stefan Antusch, Vinzenz Maurer
|
Running quark and lepton parameters at various scales
|
16 pages, 6 figures; data tables with the GUT scale results and an
example Mathematica notebook are provided at
http://particlesandcosmology.unibas.ch/RunningParameters.tar.gz ; v2: version
to appear in JHEP, updated data including higher MSUSY
|
JHEP 1311 (2013) 115
|
10.1007/JHEP11(2013)115
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We calculate the values and 1 sigma ranges of the running quark and lepton
Yukawa couplings as well as of the quark mixing parameters at various energy
scales, i.e. at M_Z, 1 TeV, 3 TeV, 10 TeV and at the GUT scale, to provide
useful input for model building. Above TeV energies, we assume the minimal
supersymmetric extension of the Standard Model, and include the
tan(beta)-enhanced one-loop supersymmetric threshold corrections which arise
when matching the SM to its SUSY extension. We calculate the GUT scale values
of the running parameters as well as their 1 sigma ranges, with the
supersymmetric threshold corrections included and with their effects
parametrised in a simple way.
|
[
{
"created": "Fri, 28 Jun 2013 15:38:40 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Oct 2013 10:43:45 GMT",
"version": "v2"
}
] |
2013-12-02
|
[
[
"Antusch",
"Stefan",
""
],
[
"Maurer",
"Vinzenz",
""
]
] |
We calculate the values and 1 sigma ranges of the running quark and lepton Yukawa couplings as well as of the quark mixing parameters at various energy scales, i.e. at M_Z, 1 TeV, 3 TeV, 10 TeV and at the GUT scale, to provide useful input for model building. Above TeV energies, we assume the minimal supersymmetric extension of the Standard Model, and include the tan(beta)-enhanced one-loop supersymmetric threshold corrections which arise when matching the SM to its SUSY extension. We calculate the GUT scale values of the running parameters as well as their 1 sigma ranges, with the supersymmetric threshold corrections included and with their effects parametrised in a simple way.
|
2403.07701
|
Xiao Yu
|
Chao-Qiang Geng, Chia-Wei Liu, Xiao Yu, Ao-Wen Zhou
|
Categorizing $SU(3)_f$ representations of scalar mesons by $J/\psi$
decays
|
12 pages, 7 figures, 7 tables
| null | null | null |
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
We explore the possibilities of categorizing $SU(3)_f$ representations of
scalar mesons through $J/\psi\to SV$ and $\gamma S$, with $S$ ($V$) being the
scalar(vector) mesons. We find that $f_0(500)$ and $f_0(980)$ are singlet and
octet states, respectively; which both belong to a nonet of the $SU(3)_f$
flavor symmetry. In addition, we determine the singlet-octet mixing angle of
$\theta = (84.2\pm13.9)^{\circ}$ between $f_0(500)$ and $f_0(980)$, which
supports the quark-antiquark ($q\bar{q}$) hypothesis. For the scalar mesons in
the range of 1-2 GeV, containing two of $f_0(1370,\ 1500,\ 1700)$, we discuss
the mixings between $q\bar{q}$ and glueballs. Our numerical results suggest
that $f_0(1370 (1500))$ has the a significant component of $n\bar{n}$
($s\bar{s}$), while $f_0(1710)$ is likely composed of the scalar glueball.
|
[
{
"created": "Tue, 12 Mar 2024 14:48:44 GMT",
"version": "v1"
}
] |
2024-03-13
|
[
[
"Geng",
"Chao-Qiang",
""
],
[
"Liu",
"Chia-Wei",
""
],
[
"Yu",
"Xiao",
""
],
[
"Zhou",
"Ao-Wen",
""
]
] |
We explore the possibilities of categorizing $SU(3)_f$ representations of scalar mesons through $J/\psi\to SV$ and $\gamma S$, with $S$ ($V$) being the scalar(vector) mesons. We find that $f_0(500)$ and $f_0(980)$ are singlet and octet states, respectively; which both belong to a nonet of the $SU(3)_f$ flavor symmetry. In addition, we determine the singlet-octet mixing angle of $\theta = (84.2\pm13.9)^{\circ}$ between $f_0(500)$ and $f_0(980)$, which supports the quark-antiquark ($q\bar{q}$) hypothesis. For the scalar mesons in the range of 1-2 GeV, containing two of $f_0(1370,\ 1500,\ 1700)$, we discuss the mixings between $q\bar{q}$ and glueballs. Our numerical results suggest that $f_0(1370 (1500))$ has the a significant component of $n\bar{n}$ ($s\bar{s}$), while $f_0(1710)$ is likely composed of the scalar glueball.
|
hep-ph/0108102
|
Roberto Contino
|
R.Contino, L.Pilo, R.Rattazzi, E.Trincherini
|
Running and Matching from 5 to 4 Dimensions
|
15 pages, 3 figures
|
Nucl.Phys. B622 (2002) 227-239
|
10.1016/S0550-3213(01)00602-2
| null |
hep-ph
| null |
We study 5 dimensional grand-unified theories in an orbifold geometry by the
method of effective field theory: we match the low and high energy theories by
integrating out at 1-loop the massive Kaluza-Klein states. In the
supersymmetric case the radius dependence of threshold effects is fixed by the
rescaling anomalies of the low energy theory. We focus on a recently proposed
SU(5) model on $M^4 \times S^1/(Z_2\times Z_2^\prime)$. Even though the
spectrum of the heavy modes is completely known, there still are corrections to
gauge unification originating from boundary couplings. In order to control
these effects one has to rely on extra assumptions. We argue that, as far as
gauge couplings are concerned, the predictive power of these models is similar
to conventional GUTs.
|
[
{
"created": "Fri, 10 Aug 2001 19:19:36 GMT",
"version": "v1"
}
] |
2009-11-07
|
[
[
"Contino",
"R.",
""
],
[
"Pilo",
"L.",
""
],
[
"Rattazzi",
"R.",
""
],
[
"Trincherini",
"E.",
""
]
] |
We study 5 dimensional grand-unified theories in an orbifold geometry by the method of effective field theory: we match the low and high energy theories by integrating out at 1-loop the massive Kaluza-Klein states. In the supersymmetric case the radius dependence of threshold effects is fixed by the rescaling anomalies of the low energy theory. We focus on a recently proposed SU(5) model on $M^4 \times S^1/(Z_2\times Z_2^\prime)$. Even though the spectrum of the heavy modes is completely known, there still are corrections to gauge unification originating from boundary couplings. In order to control these effects one has to rely on extra assumptions. We argue that, as far as gauge couplings are concerned, the predictive power of these models is similar to conventional GUTs.
|
1801.04808
|
Hai-Bing Fu
|
Hai-Bing Fu, Xing-Gang Wu, Wei Cheng, Tao Zhong and Zhan Sun
|
The asymmetries of the $B \to K^* \mu^+ \mu^-$ decay and the search of
new physics beyond the Standard Model
|
11 pages, 6 figures, references updated and revised version to be
published in Phys. Rev. D
|
Phys. Rev. D 97, 055037 (2018)
|
10.1103/PhysRevD.97.055037
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper, we compute the forward-backward asymmetry and the isospin
asymmetry of the $B \to K^* \mu^+ \mu^-$ decay. The $B \to K^*$ transition form
factors (TFFs) are key components of the decay. To achieve a more accurate QCD
prediction, we adopt a chiral correlator for calculating the QCD light-cone sum
rules for those TFFs with the purpose of suppressing the uncertain high-twist
distribution amplitudes. Our predictions show that the asymmetries under the
Standard Model and the Minimal Supersymmetric Standard Model with minimal
flavor violation are close in shape for $q^2 \ge 6~{\rm GeV}^2$ and are
consistent with the Belle, LHCb and CDF data within errors. When $q^2 < 2~{\rm
GeV}^2$, their predictions behave quite differently. Thus a careful study on
the $B \to K^* \mu^+ \mu^-$ decay within small $q^2$-region could be helpful
for searching new physics beyond the Standard Model. As a further application,
we also apply the $B \to K^*$ TFFs to the branching ratio and longitudinal
polarization fraction of the $B\to K^*\nu\bar\nu$ decay within different
models.
|
[
{
"created": "Mon, 15 Jan 2018 14:05:45 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Jan 2018 03:50:19 GMT",
"version": "v2"
}
] |
2018-03-28
|
[
[
"Fu",
"Hai-Bing",
""
],
[
"Wu",
"Xing-Gang",
""
],
[
"Cheng",
"Wei",
""
],
[
"Zhong",
"Tao",
""
],
[
"Sun",
"Zhan",
""
]
] |
In this paper, we compute the forward-backward asymmetry and the isospin asymmetry of the $B \to K^* \mu^+ \mu^-$ decay. The $B \to K^*$ transition form factors (TFFs) are key components of the decay. To achieve a more accurate QCD prediction, we adopt a chiral correlator for calculating the QCD light-cone sum rules for those TFFs with the purpose of suppressing the uncertain high-twist distribution amplitudes. Our predictions show that the asymmetries under the Standard Model and the Minimal Supersymmetric Standard Model with minimal flavor violation are close in shape for $q^2 \ge 6~{\rm GeV}^2$ and are consistent with the Belle, LHCb and CDF data within errors. When $q^2 < 2~{\rm GeV}^2$, their predictions behave quite differently. Thus a careful study on the $B \to K^* \mu^+ \mu^-$ decay within small $q^2$-region could be helpful for searching new physics beyond the Standard Model. As a further application, we also apply the $B \to K^*$ TFFs to the branching ratio and longitudinal polarization fraction of the $B\to K^*\nu\bar\nu$ decay within different models.
|
2203.04276
|
Maximilian Berbig
|
Maximilian Berbig
|
Freeze-In of radiative keV-scale neutrino dark matter from a new
$\text{U}(1)_\text{B-L}$
|
v2: Typos fixed, references added, two short estimates about Higgs
mediated annihilations added, conclusions unchanged; v3: Added projections on
Higgs to Inv. decays, matches published version
|
J. High Energ. Phys. 2022, 101 (2022)
|
10.1007/JHEP09(2022)101
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We extend the Dirac Scotogenic model with the aim of realizing neutrino
masses together with the mass of a keV-scale dark matter (DM) candidate via the
same one-loop topology. Two of the Standard Model (SM) neutrinos become massive
Dirac fermions while the third one remains massless. Our particle content is
motivated by an anomaly free $\text{U}(1)_\text{B-L}$ gauge symmetry with
exotic irrational charges and we need to enforce an additional $\mathcal{Z}_5$
symmetry. The dark matter candidate does not mix with the active neutrinos and
does not have any decay modes to SM particles. DM is produced together with
dark radiation in the form of right handed neutrinos via out of equilibrium
annihilations of the SM fermions mediated by the heavy B-L gauge boson. In
order to avoid DM over-production from Higgs decays and to comply with
Lyman-$\alpha$ bounds we work in a low temperature reheating scenario with
$4\;\text{MeV}\lesssim T_\text{RH}\lesssim 5\;\text{GeV}$. Our setup predicts a
contribution to $\Delta N_\text{eff.}$ that decreases for larger DM masses and
is below the sensitivity of upcoming precision measurements such as CMB-S4. A
future observation of a signal with $\Delta N_\text{eff.}\gtrsim 0.012$ would
exclude our scenario. We further sketch how inflation, reheating and
Affleck-Dine baryogenesis can also be potentially realized in this unified
framework.
|
[
{
"created": "Tue, 8 Mar 2022 18:50:30 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Jun 2022 08:51:05 GMT",
"version": "v2"
},
{
"created": "Thu, 22 Sep 2022 18:22:08 GMT",
"version": "v3"
}
] |
2022-09-26
|
[
[
"Berbig",
"Maximilian",
""
]
] |
We extend the Dirac Scotogenic model with the aim of realizing neutrino masses together with the mass of a keV-scale dark matter (DM) candidate via the same one-loop topology. Two of the Standard Model (SM) neutrinos become massive Dirac fermions while the third one remains massless. Our particle content is motivated by an anomaly free $\text{U}(1)_\text{B-L}$ gauge symmetry with exotic irrational charges and we need to enforce an additional $\mathcal{Z}_5$ symmetry. The dark matter candidate does not mix with the active neutrinos and does not have any decay modes to SM particles. DM is produced together with dark radiation in the form of right handed neutrinos via out of equilibrium annihilations of the SM fermions mediated by the heavy B-L gauge boson. In order to avoid DM over-production from Higgs decays and to comply with Lyman-$\alpha$ bounds we work in a low temperature reheating scenario with $4\;\text{MeV}\lesssim T_\text{RH}\lesssim 5\;\text{GeV}$. Our setup predicts a contribution to $\Delta N_\text{eff.}$ that decreases for larger DM masses and is below the sensitivity of upcoming precision measurements such as CMB-S4. A future observation of a signal with $\Delta N_\text{eff.}\gtrsim 0.012$ would exclude our scenario. We further sketch how inflation, reheating and Affleck-Dine baryogenesis can also be potentially realized in this unified framework.
|
2103.06151
|
Kazem Azizi
|
S. S. Agaev, K. Azizi, H. Sundu
|
Vector resonance $X_1(2900)$ and its structure
|
8 Pages, 1 Figure and 1 Table
| null |
10.1016/j.nuclphysa.2021.122202
| null |
hep-ph hep-ex hep-lat
|
http://creativecommons.org/licenses/by/4.0/
|
The new vector resonance $X_1(2900)$ observed recently by LHCb in the $
D^{-}K^{+}$ invariant mass distribution in the decay $B^{+} \to
D^{+}D^{-}K^{+}$ is studied to uncover internal structure of this state, and
calculate its physical parameters. In the present paper, the resonance $
X_1(2900)$ is modeled as an exotic vector state, $ J^P=1^- $, built of the
light diquark $u^{T}C\gamma_5d$ and heavy antidiquark $\overline{c}
\gamma_{\mu}\gamma_5C\overline{s}^{T}$. The mass and current coupling of $
X_1(2900)$ are computed using the QCD two-point sum rule approach by taking
into account various vacuum condensates up to dimension $10$. The width of the
resonance $X_1(2900)$ is saturated by two decay channels $X_1 \to D^{-}K^{+}$
and $X_1 \to \overline{D}^{0}K^{0}$. The strong couplings $g_1$ and $g_2$
corresponding to the vertices $X_1D^{-}K^{+}$ and $X_1\overline{D} ^{0}K^{0}$
are evaluated in the context of the QCD light-cone sum rule method and
technical tools of the soft-meson approximation. Results for the mass of the
resonance $X_1(2900)$ $m=(2890~\pm 122)~\mathrm{MeV}$, and for its full width
$\Gamma _{\mathrm{full}}=(93\pm 13)~\mathrm{MeV}$ are smaller than their
experimental values reported by the LHCb collaboration. Nevertheless, by taking
into account theoretical and experimental errors of investigations,
interpretation of the state $X_1(2900)$ as the vector tetraquark does not
contradict to the LHCb data. We also point out that analysis of the invariant
mass distribution $D^{+}K^{+}$ in the same decay $ B^{+} \to D^{+}D^{-}K^{+}$
may reveal doubly charged four-quark structures $
[uc][\overline{s}\overline{d}]$.
|
[
{
"created": "Wed, 10 Mar 2021 16:05:29 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Apr 2021 09:10:56 GMT",
"version": "v2"
}
] |
2021-05-19
|
[
[
"Agaev",
"S. S.",
""
],
[
"Azizi",
"K.",
""
],
[
"Sundu",
"H.",
""
]
] |
The new vector resonance $X_1(2900)$ observed recently by LHCb in the $ D^{-}K^{+}$ invariant mass distribution in the decay $B^{+} \to D^{+}D^{-}K^{+}$ is studied to uncover internal structure of this state, and calculate its physical parameters. In the present paper, the resonance $ X_1(2900)$ is modeled as an exotic vector state, $ J^P=1^- $, built of the light diquark $u^{T}C\gamma_5d$ and heavy antidiquark $\overline{c} \gamma_{\mu}\gamma_5C\overline{s}^{T}$. The mass and current coupling of $ X_1(2900)$ are computed using the QCD two-point sum rule approach by taking into account various vacuum condensates up to dimension $10$. The width of the resonance $X_1(2900)$ is saturated by two decay channels $X_1 \to D^{-}K^{+}$ and $X_1 \to \overline{D}^{0}K^{0}$. The strong couplings $g_1$ and $g_2$ corresponding to the vertices $X_1D^{-}K^{+}$ and $X_1\overline{D} ^{0}K^{0}$ are evaluated in the context of the QCD light-cone sum rule method and technical tools of the soft-meson approximation. Results for the mass of the resonance $X_1(2900)$ $m=(2890~\pm 122)~\mathrm{MeV}$, and for its full width $\Gamma _{\mathrm{full}}=(93\pm 13)~\mathrm{MeV}$ are smaller than their experimental values reported by the LHCb collaboration. Nevertheless, by taking into account theoretical and experimental errors of investigations, interpretation of the state $X_1(2900)$ as the vector tetraquark does not contradict to the LHCb data. We also point out that analysis of the invariant mass distribution $D^{+}K^{+}$ in the same decay $ B^{+} \to D^{+}D^{-}K^{+}$ may reveal doubly charged four-quark structures $ [uc][\overline{s}\overline{d}]$.
|
hep-ph/0411004
|
Bogdan A. Dobrescu
|
Bogdan A. Dobrescu
|
Massless Gauge Bosons other than the Photon
|
5 pages
|
Phys.Rev.Lett.94:151802,2005
|
10.1103/PhysRevLett.94.151802
|
FERMILAB-PUB-04-289-T
|
hep-ph astro-ph
| null |
Gauge bosons associated with unbroken gauge symmetries, under which all
standard model fields are singlets, may interact with ordinary matter via
higher-dimensional operators. A complete set of dimension-six operators
involving a massless U(1) field, gamma-prime, and standard model fields is
presented. The mu to e gamma-prime decay, primordial nucleosynthesis, star
cooling and other phenomena set lower limits on the scale of chirality-flip
operators in the 1 - 15 TeV range, if the operators have coefficients given by
the corresponding Yukawa couplings. Simple renormalizable models induce
gamma-prime interactions with leptons or quarks at two loops, and may provide a
cold dark matter candidate.
|
[
{
"created": "Mon, 1 Nov 2004 19:52:44 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Dobrescu",
"Bogdan A.",
""
]
] |
Gauge bosons associated with unbroken gauge symmetries, under which all standard model fields are singlets, may interact with ordinary matter via higher-dimensional operators. A complete set of dimension-six operators involving a massless U(1) field, gamma-prime, and standard model fields is presented. The mu to e gamma-prime decay, primordial nucleosynthesis, star cooling and other phenomena set lower limits on the scale of chirality-flip operators in the 1 - 15 TeV range, if the operators have coefficients given by the corresponding Yukawa couplings. Simple renormalizable models induce gamma-prime interactions with leptons or quarks at two loops, and may provide a cold dark matter candidate.
|
hep-ph/0608319
|
Joan Rojo
|
M. C. Gonzalez-Garcia, M. Maltoni and J. Rojo
|
Extraction of the atmospheric neutrino fluxes from experimental event
rate data
|
6 pages, 2 figs, to appear in the proceedings of the 2nd
International Conference on Quantum Theories and Renormalization Group in
Gravity and Cosmology, Barcelona, July 2006
|
J.Phys.A40:7093-7098,2007
|
10.1088/1751-8113/40/25/S67
| null |
hep-ph
| null |
The precise knowledge of the atmospheric neutrino fluxes is a key ingredient
in the interpretation of the results from any atmospheric neutrino experiment.
In the standard atmospheric neutrino data analysis, these fluxes are
theoretical inputs obtained from sophisticated numerical calculations. In this
contribution we present an alternative approach to the determination of the
atmospheric neutrino fluxes based on the direct extraction from the
experimental data on neutrino event rates. The extraction is achieved by means
of a combination of artificial neural networks as interpolants and Monte Carlo
methods.
|
[
{
"created": "Wed, 30 Aug 2006 11:19:21 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Gonzalez-Garcia",
"M. C.",
""
],
[
"Maltoni",
"M.",
""
],
[
"Rojo",
"J.",
""
]
] |
The precise knowledge of the atmospheric neutrino fluxes is a key ingredient in the interpretation of the results from any atmospheric neutrino experiment. In the standard atmospheric neutrino data analysis, these fluxes are theoretical inputs obtained from sophisticated numerical calculations. In this contribution we present an alternative approach to the determination of the atmospheric neutrino fluxes based on the direct extraction from the experimental data on neutrino event rates. The extraction is achieved by means of a combination of artificial neural networks as interpolants and Monte Carlo methods.
|
0905.2144
|
Timur Delahaye
|
Timur Delahaye, Pierre Brun, Fiorenza Donato, Nicolao Fornengo, Julien
Lavalle, Roberto Lineros, Richard Taillet and Pierre Salati
|
Anti-Matter in Cosmic Rays : Backgrounds and Signals
|
Proceedings for XLIVemes rencontres de Moriond, Electroweak
Interactions And Unified Theories session
| null | null |
LAPTH-Conf-1321/09
|
hep-ph astro-ph.CO astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Recent PAMELA and ATIC data seem to indicate an excess in positron cosmic
rays above approximately 10 GeV which might be due to galactic Dark Matter
particle annihilation. However the background of this signal suffers many
uncertainties that make our task difficult in constraining Dark Matter or any
other astrophysical explanation for these recent surprising data.
|
[
{
"created": "Wed, 13 May 2009 16:45:29 GMT",
"version": "v1"
},
{
"created": "Wed, 20 May 2009 17:13:41 GMT",
"version": "v2"
}
] |
2009-05-20
|
[
[
"Delahaye",
"Timur",
""
],
[
"Brun",
"Pierre",
""
],
[
"Donato",
"Fiorenza",
""
],
[
"Fornengo",
"Nicolao",
""
],
[
"Lavalle",
"Julien",
""
],
[
"Lineros",
"Roberto",
""
],
[
"Taillet",
"Richard",
""
],
[
"Salati",
"Pierre",
""
]
] |
Recent PAMELA and ATIC data seem to indicate an excess in positron cosmic rays above approximately 10 GeV which might be due to galactic Dark Matter particle annihilation. However the background of this signal suffers many uncertainties that make our task difficult in constraining Dark Matter or any other astrophysical explanation for these recent surprising data.
|
hep-ph/9306275
|
Ulf Meissner
|
Ulf-G. Mei{\ss}ner
|
Thermal Pions
|
7 pp, LaTeX, uses espcrc1.sty from North-Holland Publishing,
BUTP-93/16
|
Nucl.Phys. A566 (1994) 141c-147c
|
10.1016/0375-9474(94)90618-1
| null |
hep-ph nucl-th
| null |
I discuss the absorption and dispersion of pions in hot matter. A two-loop
calculation in the framework of chiral perturbation theory is presented and its
result is compactly written in terms of the two- and three-particle forward
$\pi \pi$ scattering amplitudes. At modest temperatures, $T \le 100$ MeV, the
change in the pion mass is small and its dispersion law closely resembles the
free space one. At these temperatures, all quantities of interest are given to
a good degree of accuracy by the first term in the virial expansion which is
linear in the density. (BUTP-93/16, uses espcrc1.sty from North-Holland
Publishing)
|
[
{
"created": "Tue, 15 Jun 1993 09:02:23 GMT",
"version": "v1"
}
] |
2009-10-22
|
[
[
"Meißner",
"Ulf-G.",
""
]
] |
I discuss the absorption and dispersion of pions in hot matter. A two-loop calculation in the framework of chiral perturbation theory is presented and its result is compactly written in terms of the two- and three-particle forward $\pi \pi$ scattering amplitudes. At modest temperatures, $T \le 100$ MeV, the change in the pion mass is small and its dispersion law closely resembles the free space one. At these temperatures, all quantities of interest are given to a good degree of accuracy by the first term in the virial expansion which is linear in the density. (BUTP-93/16, uses espcrc1.sty from North-Holland Publishing)
|
2103.05048
|
Prabal Adhikari
|
Prabal Adhikari
|
Topological Susceptibility in a Uniform Magnetic Field
|
7 pages, expanded introduction and discussion
| null |
10.1016/j.physletb.2021.136826
| null |
hep-ph hep-lat hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the topological susceptibility and the fourth cumulant of the QCD
vacuum in the presence of a uniform, background magnetic field in two-and-three
flavor QCD finding novel, model-independent sum rules relating the shift in the
topological susceptibility due to the background field to the shift in the
quark condensates, and the shift in the fourth cumulant to the shifts in the
quark condensates and susceptibilities
|
[
{
"created": "Mon, 8 Mar 2021 20:05:56 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Nov 2021 02:06:26 GMT",
"version": "v2"
}
] |
2021-12-15
|
[
[
"Adhikari",
"Prabal",
""
]
] |
We study the topological susceptibility and the fourth cumulant of the QCD vacuum in the presence of a uniform, background magnetic field in two-and-three flavor QCD finding novel, model-independent sum rules relating the shift in the topological susceptibility due to the background field to the shift in the quark condensates, and the shift in the fourth cumulant to the shifts in the quark condensates and susceptibilities
|
hep-ph/9708203
|
Kiselev
|
V.V.Kiselev
|
Model for two generations of fermions
|
8 pages, some explanations and references are added
| null | null | null |
hep-ph hep-th
| null |
In the model with the spontaneous breaking of chiral gauge symmetry, the
vacuum structure for the pair of Higgs fields can provide the introduction of
two generations of fermions. The mixing matrix of charged currents is
determined.
|
[
{
"created": "Fri, 1 Aug 1997 09:16:12 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Sep 1997 20:42:48 GMT",
"version": "v2"
},
{
"created": "Tue, 16 Dec 1997 07:16:39 GMT",
"version": "v3"
},
{
"created": "Fri, 27 Feb 1998 05:57:59 GMT",
"version": "v4"
}
] |
2008-02-03
|
[
[
"Kiselev",
"V. V.",
""
]
] |
In the model with the spontaneous breaking of chiral gauge symmetry, the vacuum structure for the pair of Higgs fields can provide the introduction of two generations of fermions. The mixing matrix of charged currents is determined.
|
1412.0893
|
Eugene Levin
|
Eugene Levin (Tel Aviv Un./UTFSM)
|
Large $\mathbf{b}$ behaviour in the CGC/saturation approach: BFKL
equation with pion loops
|
10pages, 6 figures in eps filers
| null |
10.1103/PhysRevD.91.054007
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper we proposed a solution to the longstanding problem of the
CGC/saturation approach: the power-like fall of the scattering amplitudes at
large $b$. This decrease leads to the violation of the Froissart theorem and
makes the approach theoretically inconsistent. We showed in the paper that sum
of the pion loops results in the exponential fall of the scattering amplitude
at large impact parameters and in the restoration of the Froissart theorem.
|
[
{
"created": "Tue, 2 Dec 2014 12:41:19 GMT",
"version": "v1"
}
] |
2015-06-23
|
[
[
"Levin",
"Eugene",
"",
"Tel Aviv Un./UTFSM"
]
] |
In this paper we proposed a solution to the longstanding problem of the CGC/saturation approach: the power-like fall of the scattering amplitudes at large $b$. This decrease leads to the violation of the Froissart theorem and makes the approach theoretically inconsistent. We showed in the paper that sum of the pion loops results in the exponential fall of the scattering amplitude at large impact parameters and in the restoration of the Froissart theorem.
|
hep-ph/0109017
|
D. P. Roy
|
Sandhya Choubey, Srubabati Goswami, D.P. Roy
|
Energy Independent Solution to the Solar Neutrino Anomaly including the
SNO data
|
18 pages, latex, 3 figures
|
Phys.Rev. D65 (2002) 073001
|
10.1103/PhysRevD.65.073001
|
TIFR/TH/01-34,SINP/TNP/01-20
|
hep-ph
| null |
The global data on solar neutrino rates and spectrum, including the SNO
charged current rate, can be explained by LMA, LOW or the energy independent
solution -- corresponding to near-maximal mixing. All the three favour a mild
upward renormalisation of the Cl rate. A mild downward shift of the $B$
neutrino flux is favoured by the energy independent and to a lesser extent the
LOW solution, but not by LMA. Comparison with the ratio of SK elastic and SNO
charged current scattering rates favours the LMA over the other two solutions,
but by no more than $1.5\sigma$.
|
[
{
"created": "Mon, 3 Sep 2001 12:41:48 GMT",
"version": "v1"
}
] |
2009-11-07
|
[
[
"Choubey",
"Sandhya",
""
],
[
"Goswami",
"Srubabati",
""
],
[
"Roy",
"D. P.",
""
]
] |
The global data on solar neutrino rates and spectrum, including the SNO charged current rate, can be explained by LMA, LOW or the energy independent solution -- corresponding to near-maximal mixing. All the three favour a mild upward renormalisation of the Cl rate. A mild downward shift of the $B$ neutrino flux is favoured by the energy independent and to a lesser extent the LOW solution, but not by LMA. Comparison with the ratio of SK elastic and SNO charged current scattering rates favours the LMA over the other two solutions, but by no more than $1.5\sigma$.
|
hep-ph/0104015
|
Rohini M. Godbole
|
Rohini M. Godbole, A. Grau, G. Pancheri and Y. Srivastava
|
Total Cross Sections
|
15 pages, 9 figures, LaTeX, uses hsproc.sty and art10.sty. Talk given
by G. Pancheri at 'International Hadron Structure-2000', October 1-6,
Staralesna
| null | null |
IISc-CTS/09/01, LNF-01-009 (P), UG-FT-129/01
|
hep-ph
| null |
A unified approach to total cross-sections, based on the QCD contribution to
the rise with energy, is presented for the processes $pp$, $p{\bar p}$, $\gamma
p, \gamma \gamma, e^+e^- \to hadrons$. For proton processes, a discussion of
the role played by soft gluon summation in taming the fast rise due to
mini-jets is presented. For photon-photon processes, a comparison with other
models indicates the need for precision measurements in both the low and high
energy region, likely only with measurements at future Linear Colliders.
|
[
{
"created": "Mon, 2 Apr 2001 12:27:30 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Godbole",
"Rohini M.",
""
],
[
"Grau",
"A.",
""
],
[
"Pancheri",
"G.",
""
],
[
"Srivastava",
"Y.",
""
]
] |
A unified approach to total cross-sections, based on the QCD contribution to the rise with energy, is presented for the processes $pp$, $p{\bar p}$, $\gamma p, \gamma \gamma, e^+e^- \to hadrons$. For proton processes, a discussion of the role played by soft gluon summation in taming the fast rise due to mini-jets is presented. For photon-photon processes, a comparison with other models indicates the need for precision measurements in both the low and high energy region, likely only with measurements at future Linear Colliders.
|
1101.2140
|
Laslo Reichert
|
Martin Hirsch, Laslo Reichert, Werner Porod
|
Supersymmetric mass spectra and the seesaw scale
|
31 pages, 49 figures
|
JHEP 1105:086,2011
|
10.1007/JHEP05(2011)086
|
IFIC/10-52
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Supersymmetric mass spectra within two variants of the seesaw mechanism,
commonly known as type-II and type-III seesaw, are calculated using full 2-loop
RGEs and minimal Supergravity boundary conditions. The type-II seesaw is
realized using one pair of 15 and $\bar{15}$ superfields, while the type-III is
realized using three copies of $24_M$ superfields. Using published, estimated
errors on SUSY mass observables attainable at the LHC and in a combined LHC+ILC
analysis, we calculate expected errors for the parameters of the models, most
notably the seesaw scale. If SUSY particles are within the reach of the ILC,
pure mSugra can be distinguished from mSugra plus type-II or type-III seesaw
for nearly all relevant values of the seesaw scale. Even in the case when only
the much less accurate LHC measurements are used, we find that indications for
the seesaw can be found in favourable parts of the parameter space. Since our
conclusions crucially depend on the reliability of the theoretically forecasted
error bars, we discuss in some detail the accuracies which need to be achieved
for the most important LHC and ILC observables before an analysis, such as the
one presented here, can find any hints for type-II or type-III seesaw in SUSY
spectra.
|
[
{
"created": "Tue, 11 Jan 2011 15:07:36 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Apr 2011 10:40:39 GMT",
"version": "v2"
}
] |
2015-03-17
|
[
[
"Hirsch",
"Martin",
""
],
[
"Reichert",
"Laslo",
""
],
[
"Porod",
"Werner",
""
]
] |
Supersymmetric mass spectra within two variants of the seesaw mechanism, commonly known as type-II and type-III seesaw, are calculated using full 2-loop RGEs and minimal Supergravity boundary conditions. The type-II seesaw is realized using one pair of 15 and $\bar{15}$ superfields, while the type-III is realized using three copies of $24_M$ superfields. Using published, estimated errors on SUSY mass observables attainable at the LHC and in a combined LHC+ILC analysis, we calculate expected errors for the parameters of the models, most notably the seesaw scale. If SUSY particles are within the reach of the ILC, pure mSugra can be distinguished from mSugra plus type-II or type-III seesaw for nearly all relevant values of the seesaw scale. Even in the case when only the much less accurate LHC measurements are used, we find that indications for the seesaw can be found in favourable parts of the parameter space. Since our conclusions crucially depend on the reliability of the theoretically forecasted error bars, we discuss in some detail the accuracies which need to be achieved for the most important LHC and ILC observables before an analysis, such as the one presented here, can find any hints for type-II or type-III seesaw in SUSY spectra.
|
hep-ph/9908384
|
Joao Pacheco Bicudo Cabral de Melo
|
J. P. B. C de Melo (Division de Physique Theorique, IPN, Orsay, France
and Universite Pierre & Marie Curie, Paris, France), T. Frederico
(Departamento de Fisica,ITA, Centro Tecnico Aeroespacial, Sao Jose dos
Campos, Brazil), H. W. L. Naus (TNO Physics and Eletronis Laboratory, The
Hague, The Netherlands) and P. U. Sauer (Institute for Theoretical Physics,
Hannover, Germany)
|
Covariance of Light-Front Models: Pair Current
|
17 pages,include 5 figures (lfcxx.eps, lfczx.eps,lfczz.eps,
lfcagg.eps and lfcaqq.eps), use latex,epsf,elsart, e-mail:
pacheco@lpnp66.in2p3.fr, tobias@fis.ita.cta.br, naus1@fel.tno.nl,
sauer@itp.uni-hannover.de, Accepted in Nucl.Phys. A (1999)
|
Nucl.Phys. A660 (1999) 219-231
|
10.1016/S0375-9474(99)00371-1
| null |
hep-ph nucl-th
| null |
We compute the "+" component of the electromagnetic current of a composite
spin-one two-fermion system for vanishing momentum transfer component
$q^+=q^0+q^3$. In particular, we extract the nonvanishing pair production
amplitude on the light-front. It is a consequence of the longitudinal zero
momentum mode, contributing to the light-front current in the Breit-frame. The
covariance of the current is violated, if such pair terms are not included in
its matrix elements. We illustrate our discussion with some numerical examples.
|
[
{
"created": "Tue, 17 Aug 1999 15:00:54 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"de Melo",
"J. P. B. C",
"",
"Division de Physique Theorique, IPN, Orsay, France\n and Universite Pierre & Marie Curie, Paris, France"
],
[
"Frederico",
"T.",
"",
"Departamento de Fisica,ITA, Centro Tecnico Aeroespacial, Sao Jose dos\n Campos, Brazil"
],
[
"Naus",
"H. W. L.",
"",
"TNO Physics and Eletronis Laboratory, The\n Hague, The Netherlands"
],
[
"Sauer",
"P. U.",
"",
"Institute for Theoretical Physics,\n Hannover, Germany"
]
] |
We compute the "+" component of the electromagnetic current of a composite spin-one two-fermion system for vanishing momentum transfer component $q^+=q^0+q^3$. In particular, we extract the nonvanishing pair production amplitude on the light-front. It is a consequence of the longitudinal zero momentum mode, contributing to the light-front current in the Breit-frame. The covariance of the current is violated, if such pair terms are not included in its matrix elements. We illustrate our discussion with some numerical examples.
|
2401.14120
|
Yuji Shi
|
Yu-Ji Shi, Ye Xing and Zhi-Peng Xing
|
Heavy baryon decays into light meson and dark baryon within LCSR
|
21 pages, 9 figures, 3 tables
| null | null | null |
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
We studied the decays of Heavy baryon into a pseudoscalar meson and a dark
baryon in the recently developed $B$-Mesogenesis scenario, where the two types
of effective Lagrangians proposed by the scenario are both considered. The
decay amplitudes of $\Lambda_b^0$ are calculated by light-cone sum rules using
its light-cone distribution amplitudes. The decay amplitudes of $\Xi_b^{0,\pm}$
are related with those of $\Lambda_b^0$ through a flavor SU(3) analysis. The
uncertainties of threshold parameter and the Borel parameter are both
considered in the numerical calculation. The values of effective coupling
constants in the $B$-Mesogenesis are taken as their upper limits that obtained
from our previous study on the inclusive decay. The upper limits of the decay
branching fractions are presented as functions of the dark baryon mass.
|
[
{
"created": "Thu, 25 Jan 2024 11:58:47 GMT",
"version": "v1"
}
] |
2024-01-26
|
[
[
"Shi",
"Yu-Ji",
""
],
[
"Xing",
"Ye",
""
],
[
"Xing",
"Zhi-Peng",
""
]
] |
We studied the decays of Heavy baryon into a pseudoscalar meson and a dark baryon in the recently developed $B$-Mesogenesis scenario, where the two types of effective Lagrangians proposed by the scenario are both considered. The decay amplitudes of $\Lambda_b^0$ are calculated by light-cone sum rules using its light-cone distribution amplitudes. The decay amplitudes of $\Xi_b^{0,\pm}$ are related with those of $\Lambda_b^0$ through a flavor SU(3) analysis. The uncertainties of threshold parameter and the Borel parameter are both considered in the numerical calculation. The values of effective coupling constants in the $B$-Mesogenesis are taken as their upper limits that obtained from our previous study on the inclusive decay. The upper limits of the decay branching fractions are presented as functions of the dark baryon mass.
|
2107.00768
|
Arlene Cristina Aguilar
|
A. C. Aguilar, C. O. Ambr\'osio, F. De Soto, M. N. Ferreira, B. M.
Oliveira, J. Papavassiliou, J. Rodr\'iguez-Quintero
|
Ghost dynamics in the soft gluon limit
|
34 pages, 12 figures
|
Phys. Rev. D 104, 054028 (2021)
|
10.1103/PhysRevD.104.054028
| null |
hep-ph hep-lat hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a detailed study of the dynamics associated with the ghost sector
of quenched QCD in the Landau gauge, where the relevant dynamical equations are
supplemented with key inputs originating from large-volume lattice simulations.
In particular, we solve the coupled system of Schwinger-Dyson equations that
governs the evolution of the ghost dressing function and the ghost-gluon
vertex, using as input for the gluon propagator lattice data that have been
cured from volume and discretization artifacts. In addition, we explore the
soft gluon limit of the same system, employing recent lattice data for the
three-gluon vertex that enters in one of the diagrams defining the
Schwinger-Dyson equation of the ghost-gluon vertex. The results obtained from
the numerical treatment of these equations are in excellent agreement with
lattice data for the ghost dressing function, once the latter have undergone
the appropriate scale-setting and artifact elimination refinements. Moreover,
the coincidence observed between the ghost-gluon vertex in general kinematics
and in the soft gluon limit reveals an outstanding consistency of physical
concepts and computational schemes.
|
[
{
"created": "Thu, 1 Jul 2021 22:43:49 GMT",
"version": "v1"
}
] |
2021-09-29
|
[
[
"Aguilar",
"A. C.",
""
],
[
"Ambrósio",
"C. O.",
""
],
[
"De Soto",
"F.",
""
],
[
"Ferreira",
"M. N.",
""
],
[
"Oliveira",
"B. M.",
""
],
[
"Papavassiliou",
"J.",
""
],
[
"Rodríguez-Quintero",
"J.",
""
]
] |
We present a detailed study of the dynamics associated with the ghost sector of quenched QCD in the Landau gauge, where the relevant dynamical equations are supplemented with key inputs originating from large-volume lattice simulations. In particular, we solve the coupled system of Schwinger-Dyson equations that governs the evolution of the ghost dressing function and the ghost-gluon vertex, using as input for the gluon propagator lattice data that have been cured from volume and discretization artifacts. In addition, we explore the soft gluon limit of the same system, employing recent lattice data for the three-gluon vertex that enters in one of the diagrams defining the Schwinger-Dyson equation of the ghost-gluon vertex. The results obtained from the numerical treatment of these equations are in excellent agreement with lattice data for the ghost dressing function, once the latter have undergone the appropriate scale-setting and artifact elimination refinements. Moreover, the coincidence observed between the ghost-gluon vertex in general kinematics and in the soft gluon limit reveals an outstanding consistency of physical concepts and computational schemes.
|
hep-ph/0009114
|
Kacper Zalewski
|
Kacper Zalewski
|
A very brief review of Bose-Einstein correlations
|
Report at the conference QCD00 Montpellier 7-12 July 2000. 15 pages,
no figures
|
Nucl.Phys.Proc.Suppl. 96 (2001) 23-30
|
10.1016/S0920-5632(01)01102-1
|
TPJU 11/2000
|
hep-ph
| null |
The GGLP approach to Bose-Einstein correlations, a hydrodynamic model and a
string model are briefly reviewed. The implications of the two models for the
Bose-Einstein correlations among the decay products of a pair of W bosons are
presented.
|
[
{
"created": "Mon, 11 Sep 2000 06:54:05 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Zalewski",
"Kacper",
""
]
] |
The GGLP approach to Bose-Einstein correlations, a hydrodynamic model and a string model are briefly reviewed. The implications of the two models for the Bose-Einstein correlations among the decay products of a pair of W bosons are presented.
|
1009.5685
|
Mikolaj Misiak
|
Mikolaj Misiak and Michal Poradzinski
|
Completing the Calculation of BLM corrections to B -> Xs gamma
|
5 pages, 2 ps figures
|
Phys.Rev.D83:014024,2011
|
10.1103/PhysRevD.83.014024
|
IFT-13/2010, TTP10-40, SFB/CPP-10-87
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Perturbative O(alpha_s^2) corrections to BR(B -> Xs gamma) in the BLM
approximation receive contributions from two-, three- and four-body final
states. While all the two-body results are well established by now, the other
ones have remained incomplete for several years. Here, we calculate the last
contribution that has been missing to date, namely the one originating from
interference of the current-current and gluonic dipole operators
(K_18^{(2)beta_0} and K_{28}^{(2)beta_0}). Moreover, we confirm all the
previously known results for BLM corrections to the photon energy spectrum that
involve the current-current operators (e.g., K_{22}^{(2)beta_0} and
K_{27}^{(2)beta_0}). Finally, we also confirm the recent findings of Ferroglia
and Haisch on self-interference of the gluonic dipole operator
(K_{88}^{(2)beta_0}).
|
[
{
"created": "Tue, 28 Sep 2010 20:25:07 GMT",
"version": "v1"
}
] |
2011-02-15
|
[
[
"Misiak",
"Mikolaj",
""
],
[
"Poradzinski",
"Michal",
""
]
] |
Perturbative O(alpha_s^2) corrections to BR(B -> Xs gamma) in the BLM approximation receive contributions from two-, three- and four-body final states. While all the two-body results are well established by now, the other ones have remained incomplete for several years. Here, we calculate the last contribution that has been missing to date, namely the one originating from interference of the current-current and gluonic dipole operators (K_18^{(2)beta_0} and K_{28}^{(2)beta_0}). Moreover, we confirm all the previously known results for BLM corrections to the photon energy spectrum that involve the current-current operators (e.g., K_{22}^{(2)beta_0} and K_{27}^{(2)beta_0}). Finally, we also confirm the recent findings of Ferroglia and Haisch on self-interference of the gluonic dipole operator (K_{88}^{(2)beta_0}).
|
hep-ph/0106249
|
John McDonald
|
John McDonald (CERN)
|
Thermally Generated Gauge Singlet Scalars as Self-Interacting Dark
Matter
|
11 pages LaTeX; considerably shortened and evolved final version, to
be published in Phys.Rev.Lett
|
Phys.Rev.Lett. 88 (2002) 091304
|
10.1103/PhysRevLett.88.091304
| null |
hep-ph astro-ph
| null |
We show that a gauge singlet scalar S, with a coupling to the Higgs doublet
of the form lambda_{S} S^{\dagger}S H^{\dagger}H and with the S mass entirely
generated by the Higgs expectation value, has a thermally generated relic
density Omega_{S} \approx 0.3 if m_{S} \approx
(2.9-10.5)(Omega_{S}/0.3)^{1/5}(h/0.7)^{2/5} MeV for Higgs boson masses in the
range 115 GeV to 1 TeV. Remarkably, this is very similar to the range (m_{S} =
(6.6-15.4)\eta^{2/3} MeV) required in order for the self-interaction
(\eta/4)(S^{\dagger}S)^{2} to account for self-interacting dark matter when
\eta is not much smaller than 1. The corresponding coupling is lambda_{S}
\approx (2.7 \times 10^{-10} - 3.6 \times
10^{-9})(Omega_{S}/0.3)^{2/5}(h/0.7)^{4/5}, implying that such scalars are very
weakly coupled to the Standard Model sector.
|
[
{
"created": "Thu, 21 Jun 2001 20:23:35 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Jun 2001 23:24:50 GMT",
"version": "v2"
},
{
"created": "Thu, 5 Jul 2001 13:26:24 GMT",
"version": "v3"
},
{
"created": "Fri, 20 Jul 2001 19:37:21 GMT",
"version": "v4"
},
{
"created": "Sun, 22 Jul 2001 15:32:29 GMT",
"version": "v5"
},
{
"created": "Sun, 20 Jan 2002 15:07:58 GMT",
"version": "v6"
}
] |
2009-11-07
|
[
[
"McDonald",
"John",
"",
"CERN"
]
] |
We show that a gauge singlet scalar S, with a coupling to the Higgs doublet of the form lambda_{S} S^{\dagger}S H^{\dagger}H and with the S mass entirely generated by the Higgs expectation value, has a thermally generated relic density Omega_{S} \approx 0.3 if m_{S} \approx (2.9-10.5)(Omega_{S}/0.3)^{1/5}(h/0.7)^{2/5} MeV for Higgs boson masses in the range 115 GeV to 1 TeV. Remarkably, this is very similar to the range (m_{S} = (6.6-15.4)\eta^{2/3} MeV) required in order for the self-interaction (\eta/4)(S^{\dagger}S)^{2} to account for self-interacting dark matter when \eta is not much smaller than 1. The corresponding coupling is lambda_{S} \approx (2.7 \times 10^{-10} - 3.6 \times 10^{-9})(Omega_{S}/0.3)^{2/5}(h/0.7)^{4/5}, implying that such scalars are very weakly coupled to the Standard Model sector.
|
2311.00378
|
Mindaugas Kar\v{c}iauskas Dr.
|
Jose A. R. Cembranos and Mindaugas Kar\v{c}iauskas
|
Constraining the General Oscillatory Inflaton Potential with Freeze-in
Dark Matter and Gravitational Waves
|
Rewritten version to include the time dependence of the inflaton
decay rate
| null | null |
IPARCOS-UCM-23-124
|
hep-ph astro-ph.CO gr-qc
|
http://creativecommons.org/licenses/by/4.0/
|
The reheating phase after inflation is one of the least observationally
constrained epochs in the evolution of the Universe. The forthcoming
gravitational wave observatories will enable us to constrain at least some of
the non-standard scenarios. For example, models where the radiation bath is
produced by the perturbative inflaton decay that oscillates around the minimum
of the potential of the form $V\propto\phi^{2n}$, with $n>2$. In such scenarios
a part of the inflationary gravitational wave spectrum becomes blue tilted,
making it observable, depending on the inflation energy scale and the reheating
temperature. The degeneracy between the latter two parameters can be broken if
dark matter in the Universe is produced via the freeze-in mechanism. The
combination of the independent measurement of dark matter mass with
gravitational wave observations makes it possible to constrain the reheating
temperature and the energy scale at the end of inflation, at least within some
parameter ranges.
|
[
{
"created": "Wed, 1 Nov 2023 09:11:07 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Jun 2024 08:52:58 GMT",
"version": "v2"
}
] |
2024-06-24
|
[
[
"Cembranos",
"Jose A. R.",
""
],
[
"Karčiauskas",
"Mindaugas",
""
]
] |
The reheating phase after inflation is one of the least observationally constrained epochs in the evolution of the Universe. The forthcoming gravitational wave observatories will enable us to constrain at least some of the non-standard scenarios. For example, models where the radiation bath is produced by the perturbative inflaton decay that oscillates around the minimum of the potential of the form $V\propto\phi^{2n}$, with $n>2$. In such scenarios a part of the inflationary gravitational wave spectrum becomes blue tilted, making it observable, depending on the inflation energy scale and the reheating temperature. The degeneracy between the latter two parameters can be broken if dark matter in the Universe is produced via the freeze-in mechanism. The combination of the independent measurement of dark matter mass with gravitational wave observations makes it possible to constrain the reheating temperature and the energy scale at the end of inflation, at least within some parameter ranges.
|
hep-ph/9210259
| null |
B. Margolis, J. Ng, M. Phipps, and H. D. Trottier
|
Quark model calculation of $\eta \to l^+ l^-$ to all orders in the bound
state relative momentum
|
17 pages REVTEX. Postscript figures appended
|
Phys.Rev. D47 (1993) 1942-1950
|
10.1103/PhysRevD.47.1942
| null |
hep-ph
| null |
The electromagnetic box diagram for the leptonic decays of pseudoscalar
mesons in the quark model is evaluated to all orders in ${\bf p} / m_q$, where
${\bf p}$ is the relative three-momentum of the quark-antiquark pair and $m_q$
is the quark mass. We compute $B_P \equiv \Gamma(\eta \to l^+ l^-) /
\Gamma(\eta \to \gamma\gamma)$ using a popular nonrelativistic (NR) harmonic
oscillator wave function, and with a relativistic momentum space wave function
that we derive from the MIT bag model. We also compare with a calculation in
the limit of extreme NR binding due to Bergstr\"om. Numerical calculations of
$B_P$ using these three parameterizations of the wave function agree to within
a few percent over a wide kinematical range. We find that the quark model leads
in a natural way to a negligible value for the ratio of dispersive to
absorptive parts of the electromagnetic amplitude for $\eta \to \mu^+ \mu^-$
(unitary bound). However we find substantial deviations from the unitary bound
in other kinematical regions, such as $\eta,\pi^0 \to e^+ e^-$. These quark
models yield $B(\eta \to \mu^+\mu^-) \approx 4.3 \times 10^{-6}$, within errors
of the recent SATURNE measurement of $5.1 \pm 0.8 \times 10^{-6}$, $B(\eta \to
e^+ e^-) \approx 6.3 \times 10^{-9}$, and $B(\pi^0 \to e^+ e^-) \approx 1.0
\times 10^{-7}$.
|
[
{
"created": "Fri, 23 Oct 1992 01:51:03 GMT",
"version": "v1"
}
] |
2009-10-22
|
[
[
"Margolis",
"B.",
""
],
[
"Ng",
"J.",
""
],
[
"Phipps",
"M.",
""
],
[
"Trottier",
"H. D.",
""
]
] |
The electromagnetic box diagram for the leptonic decays of pseudoscalar mesons in the quark model is evaluated to all orders in ${\bf p} / m_q$, where ${\bf p}$ is the relative three-momentum of the quark-antiquark pair and $m_q$ is the quark mass. We compute $B_P \equiv \Gamma(\eta \to l^+ l^-) / \Gamma(\eta \to \gamma\gamma)$ using a popular nonrelativistic (NR) harmonic oscillator wave function, and with a relativistic momentum space wave function that we derive from the MIT bag model. We also compare with a calculation in the limit of extreme NR binding due to Bergstr\"om. Numerical calculations of $B_P$ using these three parameterizations of the wave function agree to within a few percent over a wide kinematical range. We find that the quark model leads in a natural way to a negligible value for the ratio of dispersive to absorptive parts of the electromagnetic amplitude for $\eta \to \mu^+ \mu^-$ (unitary bound). However we find substantial deviations from the unitary bound in other kinematical regions, such as $\eta,\pi^0 \to e^+ e^-$. These quark models yield $B(\eta \to \mu^+\mu^-) \approx 4.3 \times 10^{-6}$, within errors of the recent SATURNE measurement of $5.1 \pm 0.8 \times 10^{-6}$, $B(\eta \to e^+ e^-) \approx 6.3 \times 10^{-9}$, and $B(\pi^0 \to e^+ e^-) \approx 1.0 \times 10^{-7}$.
|
hep-ph/0703127
|
Claudio Coriano
|
Claudio Coriano, Nikos Irges and Simone Morelli
|
Stuckelberg Axions and the Effective Action of Anomalous Abelian Models
2. A SU(3)_C x SU(2)_W x U(1)_Y x U(1)_B model and its signature at the LHC
|
50 pages, 16 figures, replaced with revised final version
|
Nucl.Phys.B789:133-174,2008
|
10.1016/j.nuclphysb.2007.07.027
| null |
hep-ph
| null |
We elaborate on an extension of the Standard Model with a gauge structure
enlarged by a single anomalous U(1), where the presence of a Wess-Zumino term
is motivated by the Green-Schwarz mechanism of string theory. The additional
gauge interaction is anomalous and requires an axion for anomaly cancelation.
The pseudoscalar implements the St\"{u}ckelberg mechanism and undergoes mixing
with the standard Higgs sector to render the additional U(1) massive. We
consider a 2-Higgs doublet model. We show that the anomalous effective vertices
involving neutral currents are potentially observable. We clarify their role in
the case of simple processes such as $Z^*\to \gamma \gamma$, which are at
variance with respect to the Standard Model. A brief discussion of the
implications of these studies for the LHC is included.
|
[
{
"created": "Mon, 12 Mar 2007 17:31:36 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Mar 2007 16:55:19 GMT",
"version": "v2"
},
{
"created": "Mon, 27 Aug 2007 19:32:29 GMT",
"version": "v3"
}
] |
2009-09-29
|
[
[
"Coriano",
"Claudio",
""
],
[
"Irges",
"Nikos",
""
],
[
"Morelli",
"Simone",
""
]
] |
We elaborate on an extension of the Standard Model with a gauge structure enlarged by a single anomalous U(1), where the presence of a Wess-Zumino term is motivated by the Green-Schwarz mechanism of string theory. The additional gauge interaction is anomalous and requires an axion for anomaly cancelation. The pseudoscalar implements the St\"{u}ckelberg mechanism and undergoes mixing with the standard Higgs sector to render the additional U(1) massive. We consider a 2-Higgs doublet model. We show that the anomalous effective vertices involving neutral currents are potentially observable. We clarify their role in the case of simple processes such as $Z^*\to \gamma \gamma$, which are at variance with respect to the Standard Model. A brief discussion of the implications of these studies for the LHC is included.
|
hep-ph/9507440
|
Christo Valiotis
|
Dan Karmgard, Subhash Rajpoot
|
Flavor Mixing, CP Violation and a Heavy Top
|
4 pages, Latex, no figures
| null | null | null |
hep-ph
| null |
The recent analysis of the electroweak data at CDF indicates that the
constraint on the top quark mass is $m_t=174\pm 17 $GeV. We accommodate this
result in a new scheme of quark mass matrices in which two elements along the
the leading diagonal are non-vanishing and the other non-vanishing elements are
those due to nearest neighbour interactions. By comparing the quark mixing
matrix elements of our scheme with the experimentally determined Kobayashi-
Maskawa matrix elememts in the standard electroweak model, we find that the CP
violating phases ($\delta_1$ and $\delta_2$) in our model violate the CP
symmetry maximally.
|
[
{
"created": "Fri, 28 Jul 1995 00:59:41 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Karmgard",
"Dan",
""
],
[
"Rajpoot",
"Subhash",
""
]
] |
The recent analysis of the electroweak data at CDF indicates that the constraint on the top quark mass is $m_t=174\pm 17 $GeV. We accommodate this result in a new scheme of quark mass matrices in which two elements along the the leading diagonal are non-vanishing and the other non-vanishing elements are those due to nearest neighbour interactions. By comparing the quark mixing matrix elements of our scheme with the experimentally determined Kobayashi- Maskawa matrix elememts in the standard electroweak model, we find that the CP violating phases ($\delta_1$ and $\delta_2$) in our model violate the CP symmetry maximally.
|
hep-ph/9406355
|
Mark Trodden
|
A.C. Davis (DAMTP, Cambridge), R. Brandenberger and M. Trodden (Brown
University)
|
Electroweak Baryogenesis with Topological Defects
|
13 pages, 1 figure (available from the authors), uses phyzzx,
BROWN-HET-950, DAMTP 94-46
| null | null | null |
hep-ph astro-ph
| null |
Electroweak baryogenesis has become a topic of much recent activity [1]. Here
we discuss a new scenario which has the advantage of being insensitive to the
order of the electroweak phase transition. We briefly review a mechanism [2]
using unstable electroweak strings [3] and discuss in detail a mechanism [4]
using topological defects (in particular cosmic strings) left behind after a
previous phase transition.
|
[
{
"created": "Tue, 21 Jun 1994 17:28:06 GMT",
"version": "v1"
}
] |
2009-09-25
|
[
[
"Davis",
"A. C.",
"",
"DAMTP, Cambridge"
],
[
"Brandenberger",
"R.",
"",
"Brown\n University"
],
[
"Trodden",
"M.",
"",
"Brown\n University"
]
] |
Electroweak baryogenesis has become a topic of much recent activity [1]. Here we discuss a new scenario which has the advantage of being insensitive to the order of the electroweak phase transition. We briefly review a mechanism [2] using unstable electroweak strings [3] and discuss in detail a mechanism [4] using topological defects (in particular cosmic strings) left behind after a previous phase transition.
|
1106.0592
|
Naohiro Kanda
|
Naohiro Kanda
|
Light-Light Scattering
|
9 pages, 3 figures
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
For a long time, it is believed that the light by light scattering is
described properly by the Lagrangian density obtained by Heisenberg and Euler.
Here, we present a new calculation which is based on the modern field theory
technique. It is found that the light-light scattering is completely different
from the old expression. The reason is basically due to the unphysical
condition (gauge condition) which was employed by the QED calcualtion of
Karplus and Neumann. The correct cross section of light-light scattering at low
energy of $(\frac{\omega}{m} \ll 1)$ can be written as $
\displaystyle{\frac{d\sigma}{d\Omega}=\frac{1}{(6\pi)^2}\frac{\alpha^4}
{(2\omega)^2}(3+2\cos^2\theta +\cos^4\theta)}$.
|
[
{
"created": "Fri, 3 Jun 2011 09:06:45 GMT",
"version": "v1"
}
] |
2015-03-19
|
[
[
"Kanda",
"Naohiro",
""
]
] |
For a long time, it is believed that the light by light scattering is described properly by the Lagrangian density obtained by Heisenberg and Euler. Here, we present a new calculation which is based on the modern field theory technique. It is found that the light-light scattering is completely different from the old expression. The reason is basically due to the unphysical condition (gauge condition) which was employed by the QED calcualtion of Karplus and Neumann. The correct cross section of light-light scattering at low energy of $(\frac{\omega}{m} \ll 1)$ can be written as $ \displaystyle{\frac{d\sigma}{d\Omega}=\frac{1}{(6\pi)^2}\frac{\alpha^4} {(2\omega)^2}(3+2\cos^2\theta +\cos^4\theta)}$.
|
hep-ph/9906408
|
Akushevich Igor
|
I.Akushevich, H.Boettcher, D.Ryckbosch
|
RADGEN 1.0. Monte Carlo Generator for Radiative Events in DIS on
Polarized and Unpolarized Targets
|
12 pages, 4 figures. A talk given at the Workshop "Monte Carlo
Generators for HERA Physics", Hamburg, 1998/99
| null | null | null |
hep-ph
| null |
A new Monte-Carlo generator including real radiated photons in DIS on
polarized and unpolarized targets is presented. Analytical and numerical tests
are performed and discussed in details.
|
[
{
"created": "Thu, 17 Jun 1999 10:50:49 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Akushevich",
"I.",
""
],
[
"Boettcher",
"H.",
""
],
[
"Ryckbosch",
"D.",
""
]
] |
A new Monte-Carlo generator including real radiated photons in DIS on polarized and unpolarized targets is presented. Analytical and numerical tests are performed and discussed in details.
|
hep-ph/9910348
|
Daniel Litim
|
Daniel F. Litim, Cristina Manuel
|
Fluctuations from dissipation in a hot non-Abelian plasma
|
9 pages, revtex, no figures, identical to published version
|
Phys.Rev. D61 (2000) 125004
|
10.1103/PhysRevD.61.125004
|
CERN-TH-99-309, HD-THEP-99-47
|
hep-ph cond-mat nucl-th
| null |
We consider a transport equation of the Boltzmann-Langevin type for
non-Abelian plasmas close to equilibrium to derive the spectral functions of
the underlying microscopic fluctuations from the entropy. The correlator of the
stochastic source is obtained from the dissipative processes in the plasma.
This approach, based on classical transport theory, exploits the well-known
link between a linearized collision integral, the entropy and the spectral
functions. Applied to the ultra-soft modes of a hot non-Abelian (classical or
quantum) plasma, the resulting spectral functions agree with earlier findings
obtained from the microscopic theory. As a by-product, it follows that
B\"odeker's effective theory is consistent with the fluctuation-dissipation
theorem.
|
[
{
"created": "Thu, 14 Oct 1999 22:39:28 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Oct 1999 23:17:11 GMT",
"version": "v2"
},
{
"created": "Wed, 8 Mar 2000 12:47:32 GMT",
"version": "v3"
},
{
"created": "Thu, 25 May 2000 13:14:55 GMT",
"version": "v4"
}
] |
2009-10-31
|
[
[
"Litim",
"Daniel F.",
""
],
[
"Manuel",
"Cristina",
""
]
] |
We consider a transport equation of the Boltzmann-Langevin type for non-Abelian plasmas close to equilibrium to derive the spectral functions of the underlying microscopic fluctuations from the entropy. The correlator of the stochastic source is obtained from the dissipative processes in the plasma. This approach, based on classical transport theory, exploits the well-known link between a linearized collision integral, the entropy and the spectral functions. Applied to the ultra-soft modes of a hot non-Abelian (classical or quantum) plasma, the resulting spectral functions agree with earlier findings obtained from the microscopic theory. As a by-product, it follows that B\"odeker's effective theory is consistent with the fluctuation-dissipation theorem.
|
hep-ph/9907301
|
Peter Kroll
|
Peter Kroll
|
Probing the nucleon at large momentum tramsfer
|
11 pages, 12 Postscript figures, fleqn, espcrc1, epsfig
|
Nucl.Phys. A666 (2000) 3-13
|
10.1016/S0375-9474(00)00002-6
|
WU B 99-18
|
hep-ph
| null |
The central role of soft nucleon matrix elements in reactions of high energy
electrons or real photons with nucleons is emphasized. These soft matrix
elements are described in terms of skewed parton distributions. Their
connections to ordinary parton distributions, form factors, Compton scattering
and hard meson electroproduction is discussed.
|
[
{
"created": "Mon, 12 Jul 1999 11:39:48 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Kroll",
"Peter",
""
]
] |
The central role of soft nucleon matrix elements in reactions of high energy electrons or real photons with nucleons is emphasized. These soft matrix elements are described in terms of skewed parton distributions. Their connections to ordinary parton distributions, form factors, Compton scattering and hard meson electroproduction is discussed.
|
hep-ph/0510385
|
Sally Dawson
|
S. Dawson
|
Electroweak Symmetry Breaking Circa 2005
|
12 pages, To be published in the Proceedings of Lepton Photon 2005,
XXII International Symposium on Lepton-Photon Interactions at High Energy,
July, 2005, Uppsala, Sweden
|
Int.J.Mod.Phys. A21 (2006) 1629-1641
|
10.1142/S0217751X06032630
| null |
hep-ph
| null |
Recent progress in both the theoretical and experimental explorations of
electroweak symmetry breaking is surveyed.
|
[
{
"created": "Fri, 28 Oct 2005 17:40:05 GMT",
"version": "v1"
}
] |
2009-11-11
|
[
[
"Dawson",
"S.",
""
]
] |
Recent progress in both the theoretical and experimental explorations of electroweak symmetry breaking is surveyed.
|
1906.11971
|
C. Hanhart
|
Christoph Hanhart and Eberhard Klempt
|
Are the XYZ states unconventional states or conventional states with
unconventional properties?
|
15 pages, 5 figures
| null |
10.1142/S0217751X20500190
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss three possible scenarios for the interpretation of mesons
containing a heavy quark and its antiquark near and above the first threshold
for a decay into a pair of heavy mesons in a relative $S$--wave. View I assumes
that these thresholds force the quark potential to flatten which implies that
while in these energy ranges molecular states may be formed there should not be
any quark--anti-quark states above these thresholds. View II assumes that the
main part of the interaction between two mesons is due to the poles which
originate from the $Q\bar Q$ interaction. The properties of the $Q\bar Q$
mesons are strongly influenced by opening thresholds but the number of states
is given by the quark model. In View III, both types of mesons are admitted
also near and above the open flavor thresholds: $Q\bar Q$ mesons and
dynamically generated mesons. Experimental consequences of these different
views are discussed.
|
[
{
"created": "Thu, 27 Jun 2019 21:28:04 GMT",
"version": "v1"
}
] |
2020-04-22
|
[
[
"Hanhart",
"Christoph",
""
],
[
"Klempt",
"Eberhard",
""
]
] |
We discuss three possible scenarios for the interpretation of mesons containing a heavy quark and its antiquark near and above the first threshold for a decay into a pair of heavy mesons in a relative $S$--wave. View I assumes that these thresholds force the quark potential to flatten which implies that while in these energy ranges molecular states may be formed there should not be any quark--anti-quark states above these thresholds. View II assumes that the main part of the interaction between two mesons is due to the poles which originate from the $Q\bar Q$ interaction. The properties of the $Q\bar Q$ mesons are strongly influenced by opening thresholds but the number of states is given by the quark model. In View III, both types of mesons are admitted also near and above the open flavor thresholds: $Q\bar Q$ mesons and dynamically generated mesons. Experimental consequences of these different views are discussed.
|
hep-ph/9905353
|
Chaehyun Yu
|
Dong-Won Jung, Kang Young Lee, H. S. Song and Chaehyun Yu
|
Polarization effects on W boson pair productions with the extra neutral
gauge boson at the e^+ e^- Linear Collider
|
24 pages, 8 figures, ReVTeX
|
J.Korean Phys.Soc.36:258-264,2000
| null |
SNUTP 99-026
|
hep-ph
| null |
We perform the comprehensive analysis of the polarization effects on the
e^+e^- -> W^+W^- process in the presence of the extra neutral gauge boson at
the LC energies. Consideration of the polarizations of the produced W bosons
and the beam polarizations provides substantial enhancements of the sensitivity
to the Z-Z' mixing angles in various models and the asymmetry variables also
give the strict constraints on the mixing angles. We find that the \chi-model
and the left-right model get the strict constraint from \sigma_{LL}^{unpol}
while the \psi-model and the \eta-model from the beam polarization asymmetry.
|
[
{
"created": "Sat, 15 May 1999 05:04:48 GMT",
"version": "v1"
}
] |
2011-03-23
|
[
[
"Jung",
"Dong-Won",
""
],
[
"Lee",
"Kang Young",
""
],
[
"Song",
"H. S.",
""
],
[
"Yu",
"Chaehyun",
""
]
] |
We perform the comprehensive analysis of the polarization effects on the e^+e^- -> W^+W^- process in the presence of the extra neutral gauge boson at the LC energies. Consideration of the polarizations of the produced W bosons and the beam polarizations provides substantial enhancements of the sensitivity to the Z-Z' mixing angles in various models and the asymmetry variables also give the strict constraints on the mixing angles. We find that the \chi-model and the left-right model get the strict constraint from \sigma_{LL}^{unpol} while the \psi-model and the \eta-model from the beam polarization asymmetry.
|
0907.0082
|
V. Gogokhia
|
V. Gogokhia
|
Renormalization of the mass gap
|
16 pages, no figures, no tables, some minor changes are introduced
|
Int.J.Theor.Phys.48:3449-3469,2009
|
10.1007/s10773-009-0150-7
| null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The full gluon propagator relevant for the description of the truly
non-perturbative QCD dynamics, the so-called intrinsically non-perturbative
gluon propagator has been derived in our previous work. It explicitly depends
on the regularized mass gap, which dominates its structure at small gluon
momentum. It is automatically transversal in a gauge invariant way. It is
characterized by the presence of severe infrared singularities at small gluon
momentum, so the gluons remain massless, and this does not depend on the gauge
choice. In this paper we have shown how precisely the renormalization program
for the regularized mass gap should be performed. We have also shown how
precisely severe infrared singularities should be correctly treated. This
allowed to analytically formulate the exact and gauge-invariant criteria of
gluon and quark confinement. After the renormalization program is completed,
one can derive the gluon propagator applicable for the calculation of physical
observables processes, etc., in low-energy QCD from first principles.
|
[
{
"created": "Wed, 1 Jul 2009 08:14:38 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Oct 2009 12:19:38 GMT",
"version": "v2"
}
] |
2009-12-15
|
[
[
"Gogokhia",
"V.",
""
]
] |
The full gluon propagator relevant for the description of the truly non-perturbative QCD dynamics, the so-called intrinsically non-perturbative gluon propagator has been derived in our previous work. It explicitly depends on the regularized mass gap, which dominates its structure at small gluon momentum. It is automatically transversal in a gauge invariant way. It is characterized by the presence of severe infrared singularities at small gluon momentum, so the gluons remain massless, and this does not depend on the gauge choice. In this paper we have shown how precisely the renormalization program for the regularized mass gap should be performed. We have also shown how precisely severe infrared singularities should be correctly treated. This allowed to analytically formulate the exact and gauge-invariant criteria of gluon and quark confinement. After the renormalization program is completed, one can derive the gluon propagator applicable for the calculation of physical observables processes, etc., in low-energy QCD from first principles.
|
hep-ph/0111056
|
Pasquale Di Bari
|
P. Di Bari
|
The cosmological information on neutrino mixing
|
5 pages, LaTeX, JHEP style, talk given at EPS HEP 2001, Budapest,
Hungary, 12 - 18 July 2001
| null | null | null |
hep-ph astro-ph
| null |
Cosmology provides interesting information on neutrino mixing models with
sterile neutrinos. In this case non standard BBN effects can be relevant. We
show how the recent measurement of the baryon content from the observations of
CMB anisotropies together with the primordial nuclear abundances measurements
can be used to constrain them. In particular four neutrino mixing models are
potentially at variance with the cosmological observations. We also discuss the
possible scenarios from future experiments.
|
[
{
"created": "Tue, 6 Nov 2001 15:06:06 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Di Bari",
"P.",
""
]
] |
Cosmology provides interesting information on neutrino mixing models with sterile neutrinos. In this case non standard BBN effects can be relevant. We show how the recent measurement of the baryon content from the observations of CMB anisotropies together with the primordial nuclear abundances measurements can be used to constrain them. In particular four neutrino mixing models are potentially at variance with the cosmological observations. We also discuss the possible scenarios from future experiments.
|
hep-ph/0604018
|
A. D. Polosa
|
L. Maiani, F. Piccinini, A.D. Polosa, V. Riquer
|
Positive Parity Scalar Mesons in the 1-2 GeV Mass Range
|
12 pages, 9 figures. Extended version. References added. Results and
conclusions unchanged
|
Eur.Phys.J.C50:609-616,2007
|
10.1140/epjc/s10052-007-0219-5
| null |
hep-ph
| null |
Based on the observation that K_0(1430) is lighter than its SU_3 counterpart,
a_0(1450), we examine the possibility that these particles, together with
f_0(1370), f_0(1500) and f_0(1710), fill a tetraquark recurrence of the sub-GeV
0^{++} nonet mixed with a glueball state. We find the picture to be consistent
with the known data about the three f_0 resonances, more than the q-qbar
hypothesis. Conventional spin-orbit coupling suggests the q-qbar, P-wave, nonet
to lie around 1200 MeV. We review possible experimental indications of a scalar
isovector resonance at 1.29 GeV, first observed by OBELIX in p-pbar
annihilation.
|
[
{
"created": "Mon, 3 Apr 2006 14:58:13 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Sep 2006 13:35:33 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Maiani",
"L.",
""
],
[
"Piccinini",
"F.",
""
],
[
"Polosa",
"A. D.",
""
],
[
"Riquer",
"V.",
""
]
] |
Based on the observation that K_0(1430) is lighter than its SU_3 counterpart, a_0(1450), we examine the possibility that these particles, together with f_0(1370), f_0(1500) and f_0(1710), fill a tetraquark recurrence of the sub-GeV 0^{++} nonet mixed with a glueball state. We find the picture to be consistent with the known data about the three f_0 resonances, more than the q-qbar hypothesis. Conventional spin-orbit coupling suggests the q-qbar, P-wave, nonet to lie around 1200 MeV. We review possible experimental indications of a scalar isovector resonance at 1.29 GeV, first observed by OBELIX in p-pbar annihilation.
|
hep-ph/0212206
|
Leonard S. Kisslinger
|
Leonard S. Kisslinger (Carnegie Mellon University)
|
Magnetic Wall From Chiral Phase Transition and CMBR Correlations
|
Eight pages, one figure, revtex. In revised version details of the
derivation of the magnetic wall is given, and a comparison with inflationary
models is given in the figure
|
Phys.Rev. D68 (2003) 043516
|
10.1103/PhysRevD.68.043516
| null |
hep-ph
| null |
Possible CMBR correlations are estimated with a model in which a Hubble-size
magnetic wall is formed during the QCD chiral phase transition. Measurable
polarization correlations are found for l greater than 1000. Metric
perturbations from the wall were found to give rise to observable correlations.
|
[
{
"created": "Sat, 14 Dec 2002 21:26:41 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Mar 2003 19:35:56 GMT",
"version": "v2"
}
] |
2009-11-07
|
[
[
"Kisslinger",
"Leonard S.",
"",
"Carnegie Mellon University"
]
] |
Possible CMBR correlations are estimated with a model in which a Hubble-size magnetic wall is formed during the QCD chiral phase transition. Measurable polarization correlations are found for l greater than 1000. Metric perturbations from the wall were found to give rise to observable correlations.
|
1605.02498
|
William Klemm
|
Rikard Enberg, William Klemm, Stefano Moretti, Shoaib Munir
|
Electroweak production of light scalar-pseudoscalar pairs from extended
Higgs sectors
|
5 pages, 3 figures. v2: References added, typos corrected, discussion
slightly expanded. Main conclusions unchanged. Published in Physics Letters B
|
Phys.Lett. B764 (2017) 121-125
|
10.1016/j.physletb.2016.11.012
|
KIAS-P16034
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In models with extended Higgs sectors, it is possible that the Higgs boson
discovered at the LHC is not the lightest one. We show that in a realistic
model (the Type I 2-Higgs Doublet Model), when the sum of the masses of a light
scalar and a pseudoscalar ($h$ and $A$) is smaller than the $Z$ boson mass, the
Electroweak (EW) production of an $hA$ pair can dominate over QCD production by
orders of magnitude, a fact not previously highlighted. This is because in the
$gg$-initiated process, $hA$ production via a resonant $Z$ in the $s$-channel
is prohibited according to the Landau-Yang theorem, which is not the case for
the $q\bar{q}$-initiated process. We explore the parameter space of the model
to highlight regions giving such $hA$ solutions while being consistent with all
constraints from collider searches, $b$-physics and EW precision data. We also
single out a few benchmark points to discuss their salient features, including
the $hA$ search channels that can be exploited at Run II of the LHC.
|
[
{
"created": "Mon, 9 May 2016 09:52:03 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Dec 2016 10:51:01 GMT",
"version": "v2"
}
] |
2016-12-08
|
[
[
"Enberg",
"Rikard",
""
],
[
"Klemm",
"William",
""
],
[
"Moretti",
"Stefano",
""
],
[
"Munir",
"Shoaib",
""
]
] |
In models with extended Higgs sectors, it is possible that the Higgs boson discovered at the LHC is not the lightest one. We show that in a realistic model (the Type I 2-Higgs Doublet Model), when the sum of the masses of a light scalar and a pseudoscalar ($h$ and $A$) is smaller than the $Z$ boson mass, the Electroweak (EW) production of an $hA$ pair can dominate over QCD production by orders of magnitude, a fact not previously highlighted. This is because in the $gg$-initiated process, $hA$ production via a resonant $Z$ in the $s$-channel is prohibited according to the Landau-Yang theorem, which is not the case for the $q\bar{q}$-initiated process. We explore the parameter space of the model to highlight regions giving such $hA$ solutions while being consistent with all constraints from collider searches, $b$-physics and EW precision data. We also single out a few benchmark points to discuss their salient features, including the $hA$ search channels that can be exploited at Run II of the LHC.
|
hep-ph/9311277
|
Gye Park
|
J.L.Lopez, D.V.Nanopoulos, G.T.Park, and A.Zichichi
|
New Precision Electroweak Tests of SU(5) x U(1) Supergravity
|
LaTeX, 11 Pages+4 Figures(not included), the figures available upon
request as an uuencoded file(0.4MB) or 4 PS files from park@tac.harc.edu,
CERN-TH.7078/93, CTP-TAMU-68/93, ACT-24/93
|
Phys.Rev.D49:4835-4841,1994
|
10.1103/PhysRevD.49.4835
| null |
hep-ph
| null |
We explore the one-loop electroweak radiative corrections in $SU(5)\times
U(1)$ supergravity via explicit calculation of vacuum-polarization and
vertex-correction contributions to the $\epsilon_1$ and $\epsilon_b$
parameters. Experimentally, these parameters are obtained from a global fit to
the set of observables $\Gamma_{l}, \Gamma_{b}, A^{l}_{FB}$, and $M_W/M_Z$. We
include $q^2$-dependent effects, which induce a large systematic negative shift
on $\epsilon_{1}$ for light chargino masses ($m_{\chi^\pm_1}\lsim70\GeV$). The
(non-oblique) supersymmetric vertex corrections to $\Zbb$, which define the
$\epsilon_b$ parameter, show a significant positive shift for light chargino
masses, which for $\tan\beta\approx2$ can be nearly compensated by a negative
shift from the charged Higgs contribution. We conclude that at the 90\%CL, for
$m_t\lsim160\GeV$ the present experimental values of $\epsilon_1$ and
$\epsilon_b$ do not constrain in any way $SU(5)\times U(1)$ supergravity in
both no-scale and dilaton scenarios. On the other hand, for $m_t\gsim160\GeV$
the constraints on the parameter space become increasingly stricter. We
demonstrate this trend with a study of the $m_t=170\GeV$ case, where only a
small region of parameter space, with $\tan\beta\gsim4$, remains allowed and
corresponds to light chargino masses ($m_{\chi^\pm_1}\lsim70\GeV$). Thus
$SU(5)\times U(1)$ supergravity combined with high-precision LEP data would
suggest the presence of light charginos if the top quark is not detected at the
Tevatron.
|
[
{
"created": "Thu, 11 Nov 1993 17:32:22 GMT",
"version": "v1"
}
] |
2009-08-25
|
[
[
"Lopez",
"J. L.",
""
],
[
"Nanopoulos",
"D. V.",
""
],
[
"Park",
"G. T.",
""
],
[
"Zichichi",
"A.",
""
]
] |
We explore the one-loop electroweak radiative corrections in $SU(5)\times U(1)$ supergravity via explicit calculation of vacuum-polarization and vertex-correction contributions to the $\epsilon_1$ and $\epsilon_b$ parameters. Experimentally, these parameters are obtained from a global fit to the set of observables $\Gamma_{l}, \Gamma_{b}, A^{l}_{FB}$, and $M_W/M_Z$. We include $q^2$-dependent effects, which induce a large systematic negative shift on $\epsilon_{1}$ for light chargino masses ($m_{\chi^\pm_1}\lsim70\GeV$). The (non-oblique) supersymmetric vertex corrections to $\Zbb$, which define the $\epsilon_b$ parameter, show a significant positive shift for light chargino masses, which for $\tan\beta\approx2$ can be nearly compensated by a negative shift from the charged Higgs contribution. We conclude that at the 90\%CL, for $m_t\lsim160\GeV$ the present experimental values of $\epsilon_1$ and $\epsilon_b$ do not constrain in any way $SU(5)\times U(1)$ supergravity in both no-scale and dilaton scenarios. On the other hand, for $m_t\gsim160\GeV$ the constraints on the parameter space become increasingly stricter. We demonstrate this trend with a study of the $m_t=170\GeV$ case, where only a small region of parameter space, with $\tan\beta\gsim4$, remains allowed and corresponds to light chargino masses ($m_{\chi^\pm_1}\lsim70\GeV$). Thus $SU(5)\times U(1)$ supergravity combined with high-precision LEP data would suggest the presence of light charginos if the top quark is not detected at the Tevatron.
|
2212.07435
|
Joshua Foster
|
Joshua W. Foster, Yujin Park, Benjamin R. Safdi, Yotam Soreq,
Weishuang Linda Xu
|
A Search for Dark Matter Lines at the Galactic Center with 14 Years of
Fermi Data
|
29 pages, 37 figures, video abstract at https://youtu.be/MWy5zHtu18A
| null |
10.1103/PhysRevD.107.103047
|
MIT-CTP/5505
|
hep-ph astro-ph.CO astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Dark matter (DM) in the Milky Way halo may annihilate or decay to photons,
producing monochromatic gamma rays. We search for DM-induced spectral lines
using 14 years of data from the Large Area Telescope onboard the Fermi
Gamma-ray Space Telescope ($\textit{Fermi}$-LAT) between $10\,\mathrm{GeV}$ and
$2\,\mathrm{TeV}$ in the inner Milky Way leveraging both the spatial and
spectral morphology of an expected signal. We present new constraints as strong
as $\langle \sigma v \rangle \lesssim 6\times 10^{-30}\,
\mathrm{cm}^3/\mathrm{s}$ for the two-to-two annihilations and $\tau \gtrsim
10^{30}\,\mathrm{s}$ for one-to-two decays, representing leading sensitivity
between $10\,\mathrm{GeV}$ and $\sim$$500\,\mathrm{GeV}$. We consider the
implications of our line-constraints on the Galactic Center Excess (GCE), which
is a previously-observed excess of continuum $\sim$GeV gamma-rays that may be
explained by DM annihilation. The Higgs portal and neutralino-like DM
scenarios, which have been extensively discussed as possible origins of the
GCE, are constrained by our work because of the lack of observed one-loop
decays to two photons. More generally, we interpret our null results in a
variety of annihilating and decaying DM models, such as neutralinos,
gravitinos, and glueballs, showing that in many cases the line search is more
powerful than the continuum, despite the continuum annihilation being at tree
level.
|
[
{
"created": "Wed, 14 Dec 2022 19:00:00 GMT",
"version": "v1"
}
] |
2023-06-07
|
[
[
"Foster",
"Joshua W.",
""
],
[
"Park",
"Yujin",
""
],
[
"Safdi",
"Benjamin R.",
""
],
[
"Soreq",
"Yotam",
""
],
[
"Xu",
"Weishuang Linda",
""
]
] |
Dark matter (DM) in the Milky Way halo may annihilate or decay to photons, producing monochromatic gamma rays. We search for DM-induced spectral lines using 14 years of data from the Large Area Telescope onboard the Fermi Gamma-ray Space Telescope ($\textit{Fermi}$-LAT) between $10\,\mathrm{GeV}$ and $2\,\mathrm{TeV}$ in the inner Milky Way leveraging both the spatial and spectral morphology of an expected signal. We present new constraints as strong as $\langle \sigma v \rangle \lesssim 6\times 10^{-30}\, \mathrm{cm}^3/\mathrm{s}$ for the two-to-two annihilations and $\tau \gtrsim 10^{30}\,\mathrm{s}$ for one-to-two decays, representing leading sensitivity between $10\,\mathrm{GeV}$ and $\sim$$500\,\mathrm{GeV}$. We consider the implications of our line-constraints on the Galactic Center Excess (GCE), which is a previously-observed excess of continuum $\sim$GeV gamma-rays that may be explained by DM annihilation. The Higgs portal and neutralino-like DM scenarios, which have been extensively discussed as possible origins of the GCE, are constrained by our work because of the lack of observed one-loop decays to two photons. More generally, we interpret our null results in a variety of annihilating and decaying DM models, such as neutralinos, gravitinos, and glueballs, showing that in many cases the line search is more powerful than the continuum, despite the continuum annihilation being at tree level.
|
hep-ph/0612250
|
Norma Mankoc Borstnik
|
S. Ansoldi, D.L. Bennett, M. Breskvar, E.I. Guendelman, M.Yu. Khlopov,
L.V. Laperashvili, D. Lukman, N.S. Mankoc Borstnik, R. Mirman, H.B. Nielsen,
M. Ninomiya, K. Petrov
|
Proceedings to the 9th Workshop 'What Comes Beyond the Standard Models',
Bled, September 16. - 26., 2006, Slovenia
|
Contains articles by different authors presented at the 9th Workshop
'What Comes Beyond the Standard Models', 16. - 26. September 2006, Bled,
Slovenia. Editors were N. Mankoc Borstnik, H. Bech Nielsen, C.D. Froggatt, D.
Lukman. vii+128pp
|
Bled workshops in physics, Vol.7, No. 2,DMFA-Zaloznistvo,
Ljubljana, Dec. 2006
| null | null |
hep-ph
| null |
Contents: 1. Child Universes in the Laboratory (S. Ansoldi and E.I.
Guendelman) 2. Relation between Finestructure Constants at the Planck Scale
from Multiple Point Principle (D.L. Bennett, L.V. Laperashvili and H.B.
Nielsen) 3. On the Origin of Families of Fermions and Their Mass Matrices --
Approximate Analyses of Properties of Four Families Within Approach Unifying
Spins and Charges (M. Breskvar, D. Lukman and N.S. Mankoc Borstnik) 4.
Cosmoparticle Physics: Cross-disciplinary Study of Physics Beyond the Standard
Model (M.Yu. Khlopov) 5. Discussion Section on 4th Generation (M.Yu. Khlopov)
6. Involution Requirement on a Boundary Makes Massless Fermions Compactified on
a Finite Flat Disk Mass Protected (N.S. Mankoc Borstnik and H.B. Nielsen) 7.
How Can Group Theory be Generalized so Perhaps Providing Further Information
About Our Universe? (R. Mirman) 8. FutureDependent Initial Conditions from
Imaginary Part in Lagrangian (H.B. Nielsen and M. Ninomiya) 9. Coupling
Self-tuning to Critical Lines From Highly Compact Extra Dimensions (K. Petrov)
|
[
{
"created": "Wed, 20 Dec 2006 10:05:04 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Ansoldi",
"S.",
""
],
[
"Bennett",
"D. L.",
""
],
[
"Breskvar",
"M.",
""
],
[
"Guendelman",
"E. I.",
""
],
[
"Khlopov",
"M. Yu.",
""
],
[
"Laperashvili",
"L. V.",
""
],
[
"Lukman",
"D.",
""
],
[
"Borstnik",
"N. S. Mankoc",
""
],
[
"Mirman",
"R.",
""
],
[
"Nielsen",
"H. B.",
""
],
[
"Ninomiya",
"M.",
""
],
[
"Petrov",
"K.",
""
]
] |
Contents: 1. Child Universes in the Laboratory (S. Ansoldi and E.I. Guendelman) 2. Relation between Finestructure Constants at the Planck Scale from Multiple Point Principle (D.L. Bennett, L.V. Laperashvili and H.B. Nielsen) 3. On the Origin of Families of Fermions and Their Mass Matrices -- Approximate Analyses of Properties of Four Families Within Approach Unifying Spins and Charges (M. Breskvar, D. Lukman and N.S. Mankoc Borstnik) 4. Cosmoparticle Physics: Cross-disciplinary Study of Physics Beyond the Standard Model (M.Yu. Khlopov) 5. Discussion Section on 4th Generation (M.Yu. Khlopov) 6. Involution Requirement on a Boundary Makes Massless Fermions Compactified on a Finite Flat Disk Mass Protected (N.S. Mankoc Borstnik and H.B. Nielsen) 7. How Can Group Theory be Generalized so Perhaps Providing Further Information About Our Universe? (R. Mirman) 8. FutureDependent Initial Conditions from Imaginary Part in Lagrangian (H.B. Nielsen and M. Ninomiya) 9. Coupling Self-tuning to Critical Lines From Highly Compact Extra Dimensions (K. Petrov)
|
1605.03886
|
Andrey Grozin
|
Andrey Grozin
|
Leading and next to leading large $n_f$ terms in the cusp anomalous
dimension and the quark-antiquark potential
|
Talk at Loops and Legs 2016, Leipzig, 24-29 April 2016; V2: 1
reference updated
| null | null |
MITP/16-044
|
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
I discuss 3 related quantities: the cusp anomalous dimension, the HQET
heavy-quark field anomalous dimension, and the quark-antiquark potential.
Leading large $n_f$ terms can be calculated to all orders in $\alpha_s$. Next
to leading terms with the abelian color structure $C_F^2$ also can be found to
all orders (but not non-abelian $C_F C_A$ terms). This talk is based on
Appendices C and D in [arXiv:1510.07803].
|
[
{
"created": "Thu, 12 May 2016 16:45:43 GMT",
"version": "v1"
},
{
"created": "Mon, 30 May 2016 00:43:26 GMT",
"version": "v2"
}
] |
2016-05-31
|
[
[
"Grozin",
"Andrey",
""
]
] |
I discuss 3 related quantities: the cusp anomalous dimension, the HQET heavy-quark field anomalous dimension, and the quark-antiquark potential. Leading large $n_f$ terms can be calculated to all orders in $\alpha_s$. Next to leading terms with the abelian color structure $C_F^2$ also can be found to all orders (but not non-abelian $C_F C_A$ terms). This talk is based on Appendices C and D in [arXiv:1510.07803].
|
hep-ph/0607226
|
Weizhen Deng
|
Ying Cui, Xiao-Lin Chen, Wei-Zhen Deng, Shi-Lin Zhu
|
The Possible Heavy Tetraquarks $qQ\bar q \bar Q$, $qq\bar Q \bar Q$ and
$qQ\bar Q \bar Q$
|
submitted for publication on June 13, 2006 revised on July 20, 2006
|
HighEnergyPhys.Nucl.Phys.31:7-13,2007
| null | null |
hep-ph
| null |
Assuming X(3872) is a $qc \bar q \bar c$ tetraquark and using its mass as
input, we perform a schematic study of the masses of possible heavy tetraquarks
using the color-magnetic interaction with the flavor symmetry breaking
corrections.
|
[
{
"created": "Thu, 20 Jul 2006 12:31:07 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Cui",
"Ying",
""
],
[
"Chen",
"Xiao-Lin",
""
],
[
"Deng",
"Wei-Zhen",
""
],
[
"Zhu",
"Shi-Lin",
""
]
] |
Assuming X(3872) is a $qc \bar q \bar c$ tetraquark and using its mass as input, we perform a schematic study of the masses of possible heavy tetraquarks using the color-magnetic interaction with the flavor symmetry breaking corrections.
|
2109.02769
|
Francisco Larios
|
Antonio O. Bouzas and F. Larios
|
Two-to-two processes at an electron-muon collider
|
15 pages, 3 figures. To appear in Advances in High Energy Physics
| null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
Based on a recent proposal to build an electron-muon collider, we study
two-to-two production processes e^- mu^+ --> f bar-f, gamma gamma that
originate from dimension 6 and 8 operators. We compare the sensitivity to those
effective couplings obtained at the collider with that of low energy
measurements of mu --> e gamma, mu --> e bar-e e and mu --> e conversion that
have recently been reported in the literature. Whereas for the production of
first family fermions the sensitivity of the collider processes is much weaker,
for the second and third family fermions it is similar or stronger than that of
low-energy processes. In the case of e^- mu^+ --> gamma gamma, the sensitivity
to a dimension 8 contact operator turns out to be the strongest in comparison.
|
[
{
"created": "Mon, 6 Sep 2021 23:04:17 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Sep 2021 01:59:36 GMT",
"version": "v2"
},
{
"created": "Sat, 11 Dec 2021 18:32:27 GMT",
"version": "v3"
}
] |
2021-12-14
|
[
[
"Bouzas",
"Antonio O.",
""
],
[
"Larios",
"F.",
""
]
] |
Based on a recent proposal to build an electron-muon collider, we study two-to-two production processes e^- mu^+ --> f bar-f, gamma gamma that originate from dimension 6 and 8 operators. We compare the sensitivity to those effective couplings obtained at the collider with that of low energy measurements of mu --> e gamma, mu --> e bar-e e and mu --> e conversion that have recently been reported in the literature. Whereas for the production of first family fermions the sensitivity of the collider processes is much weaker, for the second and third family fermions it is similar or stronger than that of low-energy processes. In the case of e^- mu^+ --> gamma gamma, the sensitivity to a dimension 8 contact operator turns out to be the strongest in comparison.
|
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