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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
hep-ph/0611052
|
Jisuke Kubo
|
Etsuko Itou, Yuji Kajiyama and Jisuke Kubo
|
The SUSY Flavor Problem, Proton Decay and Discrete Family Symmetry
|
5 pages, 1 figure, to appear in Proceedings of SUSY06, the 14th
International Conference on Supersymmetry and the Unification of Fundamental
Interactions, UC Irvine, California, 12-17 June 2006
|
AIPConf.Proc.903:389-392,2007
|
10.1063/1.2735206
|
KANAZAWA-06-15
|
hep-ph
| null |
We consider a supersymmetric extension of the standard model, which possess a
family symmetry based on a binary dihedral group Q6, and investigate the
consequences of the family symmetry on the mixing of fermions, FCNCs and the
stability of proton.
|
[
{
"created": "Sat, 4 Nov 2006 13:06:33 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Itou",
"Etsuko",
""
],
[
"Kajiyama",
"Yuji",
""
],
[
"Kubo",
"Jisuke",
""
]
] |
We consider a supersymmetric extension of the standard model, which possess a family symmetry based on a binary dihedral group Q6, and investigate the consequences of the family symmetry on the mixing of fermions, FCNCs and the stability of proton.
|
2212.02218
|
Song Mao
|
Xiao-Hui Mei, Zhuo Yu, Mao Song, Jian-You Guo, Gang Li, Xuan Luo
|
Explanation of Y(4630) as hadronic resonant state
|
8 pages, 9 figures, accepted by Chinese Physics C
| null |
10.1088/1674-1137/aca959
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
After Y(4630) is discovered, theorists have given various explanations. We
find that if Y(4630) is interpreted as the D-wave resonant state of $\Lambda_c
\bar {\Lambda}_c$ system, the particle mass, decay width and all quantum
numbers are consistent with experimental observations. We use the Bonn
approximation to get the interaction potential of one boson exchange model,
then extend the complex scaling method (CSM) to calculate the bound and
resonant states. The results indicate that the $\Lambda_c \bar{\Lambda}_c$
system can form not only the bound state of S wave, but also the resonant state
of the high angular momentum, and the $^3D_1$ wave resonant state can explain
the structure of Y(4630) very well.
|
[
{
"created": "Mon, 5 Dec 2022 12:50:21 GMT",
"version": "v1"
}
] |
2023-02-22
|
[
[
"Mei",
"Xiao-Hui",
""
],
[
"Yu",
"Zhuo",
""
],
[
"Song",
"Mao",
""
],
[
"Guo",
"Jian-You",
""
],
[
"Li",
"Gang",
""
],
[
"Luo",
"Xuan",
""
]
] |
After Y(4630) is discovered, theorists have given various explanations. We find that if Y(4630) is interpreted as the D-wave resonant state of $\Lambda_c \bar {\Lambda}_c$ system, the particle mass, decay width and all quantum numbers are consistent with experimental observations. We use the Bonn approximation to get the interaction potential of one boson exchange model, then extend the complex scaling method (CSM) to calculate the bound and resonant states. The results indicate that the $\Lambda_c \bar{\Lambda}_c$ system can form not only the bound state of S wave, but also the resonant state of the high angular momentum, and the $^3D_1$ wave resonant state can explain the structure of Y(4630) very well.
|
hep-ph/9909306
|
Kenzo Ogure
|
K. Ogure and J. Sato
|
The Auxiliary Mass Method beyond the Local Potential Approximation
|
23 pages, 3 EPS figures
|
Prog.Theor.Phys. 106 (2001) 131-147
|
10.1143/PTP.106.131
|
UT-850
|
hep-ph
| null |
We show that the evolution equation of the effective potential in the
auxiliary mass method corresponds to a leading approximation of a certain
series. This series is derived from an evolution equation of an effective
action using a derivative expansion. We derived an expression of the
next-to-leading approximation of the evolution equation, which is a
simultaneous partial differential equation.
|
[
{
"created": "Thu, 9 Sep 1999 12:59:21 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Sep 1999 10:31:07 GMT",
"version": "v2"
}
] |
2009-10-31
|
[
[
"Ogure",
"K.",
""
],
[
"Sato",
"J.",
""
]
] |
We show that the evolution equation of the effective potential in the auxiliary mass method corresponds to a leading approximation of a certain series. This series is derived from an evolution equation of an effective action using a derivative expansion. We derived an expression of the next-to-leading approximation of the evolution equation, which is a simultaneous partial differential equation.
|
hep-ph/0201138
|
Gottfried Holzwarth
|
G. Holzwarth (Siegen University)
|
Electromagnetic Form Factors of the Nucleon in the Chiral Soliton Model
|
8 pages, 5 figures
| null | null |
SI-TH-02-01
|
hep-ph
| null |
Several years ago it was pointed out that the chiral soliton model allows
naturally for satisfactory agreement with the experimentally well-determined
proton magnetic form factor $G_M^p$. The corresponding result for the proton
electric form factor at that time was in serious disagreement with the data
because the calculated $G_E^p$ showed as a rather stable feature a zero for
$q^2$ near 10 (GeV/c)$^2$ which was hard to avoid for reasonable choices of
parameters, while the data at that time showed no indication for such a
behaviour. Meanwhile, new data have confirmed those $G_E^p$ predictions in a
remarkable way, so it appears worthwhile to have another look at that model,
especially concerning its flexibility with repect to the electric neutron
formfactor $G_E^n$ while trying to maintain the satisfactory results for the
proton form factors.
|
[
{
"created": "Tue, 15 Jan 2002 14:48:25 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Holzwarth",
"G.",
"",
"Siegen University"
]
] |
Several years ago it was pointed out that the chiral soliton model allows naturally for satisfactory agreement with the experimentally well-determined proton magnetic form factor $G_M^p$. The corresponding result for the proton electric form factor at that time was in serious disagreement with the data because the calculated $G_E^p$ showed as a rather stable feature a zero for $q^2$ near 10 (GeV/c)$^2$ which was hard to avoid for reasonable choices of parameters, while the data at that time showed no indication for such a behaviour. Meanwhile, new data have confirmed those $G_E^p$ predictions in a remarkable way, so it appears worthwhile to have another look at that model, especially concerning its flexibility with repect to the electric neutron formfactor $G_E^n$ while trying to maintain the satisfactory results for the proton form factors.
|
hep-ph/0510029
|
Thomas Kernreiter
|
A. Bartl, H. Fraas, S. Hesselbach, K. Hohenwarter-Sodek, T.
Kernreiter, G. Moortgat-Pick
|
CP-odd observables in neutralino production with transverse e+ and e-
beam polarization
|
30 pages, minor changes in the introduction, references added
|
JHEP 0601 (2006) 170
|
10.1088/1126-6708/2006/01/170
| null |
hep-ph
| null |
We consider neutralino production and decay e^+e^ --> chi^0_i chi^0_j,
chi^0_j --> chi^0_1 f \bar{f} at a linear collider with transverse e^+ and e^-
beam polarization. We propose CP asymmetries by means of the azimuthal
distribution of the produced neutralinos and of that of the final leptons,
while taking also into account the subsequent decays of the neutralinos. We
include the complete spin correlations between production and decay. Our
framework is the Minimal Supersymmetric Standard Model with complex parameters.
In a numerical study we show that there are good prospects to observe these CP
asymmetries at the International Linear Collider and estimate the accuracy
expected for the determination of the phases in the neutralino sector.
|
[
{
"created": "Mon, 3 Oct 2005 16:34:02 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Dec 2005 11:44:30 GMT",
"version": "v2"
}
] |
2009-11-11
|
[
[
"Bartl",
"A.",
""
],
[
"Fraas",
"H.",
""
],
[
"Hesselbach",
"S.",
""
],
[
"Hohenwarter-Sodek",
"K.",
""
],
[
"Kernreiter",
"T.",
""
],
[
"Moortgat-Pick",
"G.",
""
]
] |
We consider neutralino production and decay e^+e^ --> chi^0_i chi^0_j, chi^0_j --> chi^0_1 f \bar{f} at a linear collider with transverse e^+ and e^- beam polarization. We propose CP asymmetries by means of the azimuthal distribution of the produced neutralinos and of that of the final leptons, while taking also into account the subsequent decays of the neutralinos. We include the complete spin correlations between production and decay. Our framework is the Minimal Supersymmetric Standard Model with complex parameters. In a numerical study we show that there are good prospects to observe these CP asymmetries at the International Linear Collider and estimate the accuracy expected for the determination of the phases in the neutralino sector.
|
1212.0904
|
Gilberto Tavares-Velasco
|
A. Bola\~nos, A. Fernandez, A. Moyotl, and G. Tavares-Velasco
|
Analysis of mu-tau conversion through \mu N -> \tau X deep inelastic
scattering induced by unparticles
|
13 pages, 8 figures, 1 table, minor corrections to match published
version
|
Phys.Rev. D87 (2013) 016004
|
10.1103/PhysRevD.87.016004
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A study of mu-tau conversion via the deep inelastic scattering process \mu N
-> \tau X, with N a nucleon, is performed taking into account the effects from
both spin-0 and spin-1 unparticles with lepton flavor violating (LFV)
couplings. This process has attracted attention in the past as it may be at the
reach of a future neutrino or muon factory. For the model parameters, we use
the most recent constraints on the unparticle LFV couplings from the
experimental limits on the muon anomalous magnetic moment and the LFV decay
\tau-> 3\mu, whereas for the unparticle scale \Lambda_U and scale dimension d_U
we use the bounds obtained from the search for mono-jets plus missing
transverse energy at the LHC. The \mu N -> \tau X cross section is analyzed
when the target is a proton and it is found that the unparticle effects can be
larger than the contribution from Higgs exchange in the minimal supersymmetric
standard model. We also analyze the behavior of the angular and energy
distributions of the emitted tau lepton, which could be used to disentangle
among distinct new physics contributions. It is found that, for a beam with an
intensity of 10^20 muons with an energy around 50 GeV on a 10^2 gr/cm^2 mass
target annually, there would be about 10^2-10^3 \mu N -> \tau X events per
year. The potential background is discussed briefly.
|
[
{
"created": "Tue, 4 Dec 2012 23:43:01 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Dec 2012 06:12:59 GMT",
"version": "v2"
}
] |
2013-01-07
|
[
[
"Bolaños",
"A.",
""
],
[
"Fernandez",
"A.",
""
],
[
"Moyotl",
"A.",
""
],
[
"Tavares-Velasco",
"G.",
""
]
] |
A study of mu-tau conversion via the deep inelastic scattering process \mu N -> \tau X, with N a nucleon, is performed taking into account the effects from both spin-0 and spin-1 unparticles with lepton flavor violating (LFV) couplings. This process has attracted attention in the past as it may be at the reach of a future neutrino or muon factory. For the model parameters, we use the most recent constraints on the unparticle LFV couplings from the experimental limits on the muon anomalous magnetic moment and the LFV decay \tau-> 3\mu, whereas for the unparticle scale \Lambda_U and scale dimension d_U we use the bounds obtained from the search for mono-jets plus missing transverse energy at the LHC. The \mu N -> \tau X cross section is analyzed when the target is a proton and it is found that the unparticle effects can be larger than the contribution from Higgs exchange in the minimal supersymmetric standard model. We also analyze the behavior of the angular and energy distributions of the emitted tau lepton, which could be used to disentangle among distinct new physics contributions. It is found that, for a beam with an intensity of 10^20 muons with an energy around 50 GeV on a 10^2 gr/cm^2 mass target annually, there would be about 10^2-10^3 \mu N -> \tau X events per year. The potential background is discussed briefly.
|
1303.1356
|
Ben King
|
B. King, H. Ruhl
|
Trident pair production in a constant crossed field
|
16 pages, 12 figures. Updated with published version
| null |
10.1103/PhysRevD.88.013005
| null |
hep-ph hep-th physics.plasm-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We isolate the two-step mechanism involving a real intermediate photon from
the one-step mechanism involving a virtual photon for the trident process in a
constant crossed field. The two-step process is shown to agree with an
integration over polarised sub-processes. At low to moderate quantum
non-linearity parameter, the one-step process is found to be suppressed. When
the parameter is large, the two decay channels are comparable if the field
dimensions are not much greater than the formation length.
|
[
{
"created": "Wed, 6 Mar 2013 15:38:07 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Apr 2013 14:30:38 GMT",
"version": "v2"
},
{
"created": "Tue, 2 Jul 2013 09:14:02 GMT",
"version": "v3"
}
] |
2013-07-11
|
[
[
"King",
"B.",
""
],
[
"Ruhl",
"H.",
""
]
] |
We isolate the two-step mechanism involving a real intermediate photon from the one-step mechanism involving a virtual photon for the trident process in a constant crossed field. The two-step process is shown to agree with an integration over polarised sub-processes. At low to moderate quantum non-linearity parameter, the one-step process is found to be suppressed. When the parameter is large, the two decay channels are comparable if the field dimensions are not much greater than the formation length.
|
1508.07051
|
Mehmet Guclu C
|
M. Y. Sengul, M. C. Guclu, O. Mercan, and N. G. Karakus
|
Electromagnetic Heavy Lepton Pair Production in Relativistic Heavy-Ion
Collisions
|
14 pages, 33 figures
| null | null | null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We calculate the cross sections of electromagnetic productions of muon and
tauon pair productions from the ultra-relativistic heavy ion collisions. Since
the Compton wavelengths of muon and tauon are comparable to the radius of the
colliding ions, nuclear form factors play important roles for calculating the
cross sections. Recent measurement [1] indicates that the neutrons are
differently distributed from the protons therefore this affects the cross
section of the heavy lepton pair production. In order to see the effects of the
neutron distributions in the nucleus, we used analytical expression of the
Fourier transforms of the Wood-Saxon distribution. Cross section calculations
show that Wood-Saxon distribution function is more sensitive to the parameter R
compare to the parameter a.
|
[
{
"created": "Thu, 27 Aug 2015 22:48:17 GMT",
"version": "v1"
}
] |
2015-08-31
|
[
[
"Sengul",
"M. Y.",
""
],
[
"Guclu",
"M. C.",
""
],
[
"Mercan",
"O.",
""
],
[
"Karakus",
"N. G.",
""
]
] |
We calculate the cross sections of electromagnetic productions of muon and tauon pair productions from the ultra-relativistic heavy ion collisions. Since the Compton wavelengths of muon and tauon are comparable to the radius of the colliding ions, nuclear form factors play important roles for calculating the cross sections. Recent measurement [1] indicates that the neutrons are differently distributed from the protons therefore this affects the cross section of the heavy lepton pair production. In order to see the effects of the neutron distributions in the nucleus, we used analytical expression of the Fourier transforms of the Wood-Saxon distribution. Cross section calculations show that Wood-Saxon distribution function is more sensitive to the parameter R compare to the parameter a.
|
0704.0928
|
Luis Anchordoqui
|
Luis Anchordoqui, Haim Goldberg, Satoshi Nawata, Carlos Nunez
|
Cosmology from String Theory
|
Version to be published in Physical Review D
|
Phys.Rev.D76:126005,2007
|
10.1103/PhysRevD.76.126005
| null |
hep-ph astro-ph hep-th
| null |
We explore the cosmological content of Salam-Sezgin six dimensional
supergravity, and find a solution to the field equations in qualitative
agreement with observation of distant supernovae, primordial nucleosynthesis
abundances, and recent measurements of the cosmic microwave background. The
carrier of the acceleration in the present de Sitter epoch is a quintessence
field slowly rolling down its exponential potential. Intrinsic to this model is
a second modulus which is automatically stabilized and acts as a source of cold
dark matter with a mass proportional to an exponential function of the
quintessence field (hence realizing VAMP models within a String context).
However, any attempt to saturate the present cold dark matter component in this
manner leads to unacceptable deviations from cosmological data -- a numerical
study reveals that this source can account for up to about 7% of the total cold
dark matter budget. We also show that (1) the model will support a de Sitter
energy in agreement with observation at the expense of a miniscule breaking of
supersymmetry in the compact space; (2) variations in the fine structure
constant are controlled by the stabilized modulus and are negligible; (3)
``fifth''forces are carried by the stabilized modulus and are short range; (4)
the long time behavior of the model in four dimensions is that of a
Robertson-Walker universe with a constant expansion rate (w = -1/3). Finally,
we present a String theory background by lifting our six dimensional
cosmological solution to ten dimensions.
|
[
{
"created": "Fri, 6 Apr 2007 20:00:10 GMT",
"version": "v1"
},
{
"created": "Wed, 2 May 2007 19:29:10 GMT",
"version": "v2"
},
{
"created": "Fri, 26 Oct 2007 11:18:37 GMT",
"version": "v3"
}
] |
2008-11-26
|
[
[
"Anchordoqui",
"Luis",
""
],
[
"Goldberg",
"Haim",
""
],
[
"Nawata",
"Satoshi",
""
],
[
"Nunez",
"Carlos",
""
]
] |
We explore the cosmological content of Salam-Sezgin six dimensional supergravity, and find a solution to the field equations in qualitative agreement with observation of distant supernovae, primordial nucleosynthesis abundances, and recent measurements of the cosmic microwave background. The carrier of the acceleration in the present de Sitter epoch is a quintessence field slowly rolling down its exponential potential. Intrinsic to this model is a second modulus which is automatically stabilized and acts as a source of cold dark matter with a mass proportional to an exponential function of the quintessence field (hence realizing VAMP models within a String context). However, any attempt to saturate the present cold dark matter component in this manner leads to unacceptable deviations from cosmological data -- a numerical study reveals that this source can account for up to about 7% of the total cold dark matter budget. We also show that (1) the model will support a de Sitter energy in agreement with observation at the expense of a miniscule breaking of supersymmetry in the compact space; (2) variations in the fine structure constant are controlled by the stabilized modulus and are negligible; (3) ``fifth''forces are carried by the stabilized modulus and are short range; (4) the long time behavior of the model in four dimensions is that of a Robertson-Walker universe with a constant expansion rate (w = -1/3). Finally, we present a String theory background by lifting our six dimensional cosmological solution to ten dimensions.
|
1506.01705
|
Gino Isidori
|
Admir Greljo, Gino Isidori, David Marzocca
|
On the breaking of Lepton Flavor Universality in B decays
|
20 pages, 7 figures. v2: discussion on flavor structure clarified;
added discussion on the associated production of the heavy vectors and a few
refs. Published version
| null | null |
ZU-TH-16/15
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In view of recent experimental indications of violations of Lepton Flavor
Universality (LFU) in $B$ decays, we analyze constraints and implications of
LFU interactions, both using an effective theory approach, and an explicit
dynamical model. We show that a simple dynamical model based on a $SU(2)_L$
triplet of massive vector bosons, coupled predominantly to third generation
fermions (both quarks and leptons), can significantly improve the description
of present data. In particular, the model decreases the tension between data
and SM predictions concerning: i) the breaking of $\tau$-$\mu$ universality in
$B\to D^{(*)} \ell \nu$ decays; ii) the breaking of $\mu$-$e$ universality in
$B \to K \ell^+\ell^-$ decays; iii) the difference between exclusive and
inclusive determinations of $|V_{cb}|$ and $|V_{ub}|$. The minimal version of
the model is in tension with ATLAS and CMS direct searches for the new massive
vectors (decaying into $\tau^+\tau^-$ pairs), but this tension can be decreased
with additional non-standard degrees of freedom. Further predictions of the
model both at low- and high-energies, in view of future high-statistics data,
are discussed.
|
[
{
"created": "Thu, 4 Jun 2015 19:56:22 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Jul 2015 07:48:39 GMT",
"version": "v2"
}
] |
2015-07-03
|
[
[
"Greljo",
"Admir",
""
],
[
"Isidori",
"Gino",
""
],
[
"Marzocca",
"David",
""
]
] |
In view of recent experimental indications of violations of Lepton Flavor Universality (LFU) in $B$ decays, we analyze constraints and implications of LFU interactions, both using an effective theory approach, and an explicit dynamical model. We show that a simple dynamical model based on a $SU(2)_L$ triplet of massive vector bosons, coupled predominantly to third generation fermions (both quarks and leptons), can significantly improve the description of present data. In particular, the model decreases the tension between data and SM predictions concerning: i) the breaking of $\tau$-$\mu$ universality in $B\to D^{(*)} \ell \nu$ decays; ii) the breaking of $\mu$-$e$ universality in $B \to K \ell^+\ell^-$ decays; iii) the difference between exclusive and inclusive determinations of $|V_{cb}|$ and $|V_{ub}|$. The minimal version of the model is in tension with ATLAS and CMS direct searches for the new massive vectors (decaying into $\tau^+\tau^-$ pairs), but this tension can be decreased with additional non-standard degrees of freedom. Further predictions of the model both at low- and high-energies, in view of future high-statistics data, are discussed.
|
2305.16431
|
Natsumi Ikeno
|
Natsumi Ikeno, Genaro Toledo, Eulogio Oset
|
Model independent analysis of femtoscopic correlation functions: An
application to the $D_{s0}^*(2317)$
|
8 pages, 2 figures, 2 tables: numerical results are updated and table
II is added
| null | null | null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We face the inverse problem of obtaining the interaction between coupled
channels from the correlation functions of these channels. We apply the method
to the interaction of the $D^0 K^+$, $D^+ K^0$, and $D^+_s \eta$ channels, from
where the $D^*_{s0}(2317)$ state emerges. We use synthetic data extracted from
an interaction model based on the local hidden gauge approach and find that the
inverse problem can determine the existence of a bound state of the system with
a precision of about 20 MeV. At the same time, we can determine the isospin
nature of the bound state and its compositeness in terms of the channels.
Furthermore, we evaluate the scattering length and effective range of all three
channels, as well as the couplings of the bound state found to all the
components. Lastly, the size parameter of the source function, $R$, which in
principle should be a magnitude provided by the experimental teams, can be
obtained from a fit to the data with relatively high accuracy. These findings
show the value of the correlation function to learn about the meson-meson
interaction for systems which are difficult to access in other present
facilities.
|
[
{
"created": "Thu, 25 May 2023 19:11:50 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Jul 2023 17:12:29 GMT",
"version": "v2"
}
] |
2023-07-13
|
[
[
"Ikeno",
"Natsumi",
""
],
[
"Toledo",
"Genaro",
""
],
[
"Oset",
"Eulogio",
""
]
] |
We face the inverse problem of obtaining the interaction between coupled channels from the correlation functions of these channels. We apply the method to the interaction of the $D^0 K^+$, $D^+ K^0$, and $D^+_s \eta$ channels, from where the $D^*_{s0}(2317)$ state emerges. We use synthetic data extracted from an interaction model based on the local hidden gauge approach and find that the inverse problem can determine the existence of a bound state of the system with a precision of about 20 MeV. At the same time, we can determine the isospin nature of the bound state and its compositeness in terms of the channels. Furthermore, we evaluate the scattering length and effective range of all three channels, as well as the couplings of the bound state found to all the components. Lastly, the size parameter of the source function, $R$, which in principle should be a magnitude provided by the experimental teams, can be obtained from a fit to the data with relatively high accuracy. These findings show the value of the correlation function to learn about the meson-meson interaction for systems which are difficult to access in other present facilities.
|
hep-ph/9602402
|
Paolo Gondolo
|
P. Gondolo (Oxford), G. Ingelman, M. Thunman (Uppsala)
|
Atmospheric muons and neutrinos from charm
|
Talk presented by P. Gondolo at TAUP95, Toledo, Sept. 1995. 3 pages,
2 Postscript figures, uses epsf.sty and espcrc2.sty
|
Nucl.Phys.Proc.Suppl. 48 (1996) 472-474
|
10.1016/0920-5632(96)00294-0
| null |
hep-ph
| null |
We have updated our previous investigation of the production of muons and
neutrinos in cosmic ray interactions with the atmosphere, taking account of
recent results from the $ep$ collider HERA in our QCD-based model for hadronic
interactions. Qualitatively, our previous results remain unmodified: our
predictions for the conventional muon and neutrino fluxes agree with earlier
calculations, whereas the charm particle treatment we use gives significantly
lower prompt fluxes compared to earlier estimates. This implies better
prospects for detecting very high energy neutrinos from cosmic sources.
|
[
{
"created": "Mon, 26 Feb 1996 21:28:22 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Gondolo",
"P.",
"",
"Oxford"
],
[
"Ingelman",
"G.",
"",
"Uppsala"
],
[
"Thunman",
"M.",
"",
"Uppsala"
]
] |
We have updated our previous investigation of the production of muons and neutrinos in cosmic ray interactions with the atmosphere, taking account of recent results from the $ep$ collider HERA in our QCD-based model for hadronic interactions. Qualitatively, our previous results remain unmodified: our predictions for the conventional muon and neutrino fluxes agree with earlier calculations, whereas the charm particle treatment we use gives significantly lower prompt fluxes compared to earlier estimates. This implies better prospects for detecting very high energy neutrinos from cosmic sources.
|
1704.07341
|
Frank E. Taylor
|
Frank E. Taylor
|
Radial Scaling in Inclusive Jet Production at Hadron Colliders
|
47 pages, 22 figures, 6 tables. Version 2 - more data added,
references enhanced
|
Phys. Rev. D 97, 054016 (2018)
|
10.1103/PhysRevD.97.054016
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Inclusive jet production in p-p and pbar-p collisions shows many of the same
kinematic systematics as observed in single particle inclusive production at
much lower energies. In an earlier study (1974) a phenomenology, called radial
scaling, was developed for the single particle inclusive cross sections that
attempted to capture the essential underlying physics of point-like parton
scattering and the fragmentation of partons into hadrons suppressed by the
kinematic boundary. The phenomenology was successful in emphasizing the
underlying systematics of the inclusive particle productions. Here we
demonstrate that inclusive jet production at the LHC in high-energy p-p
collisions and at the Tevatron in pbar-p inelastic scattering show similar
behavior. The ATLAS inclusive jet production plotted as a function of this
scaling variable is studied for sqrt(s) of 2.76, 7 and 13 TeV and is compared
to pbar-p inclusive jet production at 1.96 TeV measured at the CDF and D0 at
the Tevatron and p-Pb inclusive jet production at the LHC ATLAS at sqrt(sNN) =
5.02 TeV. Inclusive single particle production at FNAL fixed target and ISR
energies are compared to inclusive J/Psi production at the LHC measured in
ATLAS, CMS and LHCb. Striking common features of the data are discussed.
|
[
{
"created": "Mon, 24 Apr 2017 17:26:50 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Jan 2018 16:25:34 GMT",
"version": "v2"
}
] |
2018-03-21
|
[
[
"Taylor",
"Frank E.",
""
]
] |
Inclusive jet production in p-p and pbar-p collisions shows many of the same kinematic systematics as observed in single particle inclusive production at much lower energies. In an earlier study (1974) a phenomenology, called radial scaling, was developed for the single particle inclusive cross sections that attempted to capture the essential underlying physics of point-like parton scattering and the fragmentation of partons into hadrons suppressed by the kinematic boundary. The phenomenology was successful in emphasizing the underlying systematics of the inclusive particle productions. Here we demonstrate that inclusive jet production at the LHC in high-energy p-p collisions and at the Tevatron in pbar-p inelastic scattering show similar behavior. The ATLAS inclusive jet production plotted as a function of this scaling variable is studied for sqrt(s) of 2.76, 7 and 13 TeV and is compared to pbar-p inclusive jet production at 1.96 TeV measured at the CDF and D0 at the Tevatron and p-Pb inclusive jet production at the LHC ATLAS at sqrt(sNN) = 5.02 TeV. Inclusive single particle production at FNAL fixed target and ISR energies are compared to inclusive J/Psi production at the LHC measured in ATLAS, CMS and LHCb. Striking common features of the data are discussed.
|
hep-ph/0405156
|
Jose Enrique Garcia
|
J. E. Garcia (for the ATLAS Collaboration)
|
Little Higgs searches at LHC
|
8 pages, 8 figures, XXXIXth Rencontres de Moriond, La Thuile(2004)
| null | null | null |
hep-ph
| null |
A new method of solving the hierarchy problem in the SM has been proposed.
This method leads to the so-called "Little Higgs" models. The ATLAS experiment
at LHC has undertaken studies of the new particles predicted by these model: a
heavy top quark, heavy gauge bosons and additional Higgs bosons. Simulations of
their decays have been carried out. The sensitivity of the ATLAS experiment to
discover these new particles is discussed.
|
[
{
"created": "Mon, 17 May 2004 16:03:15 GMT",
"version": "v1"
}
] |
2019-08-14
|
[
[
"Garcia",
"J. E.",
"",
"for the ATLAS Collaboration"
]
] |
A new method of solving the hierarchy problem in the SM has been proposed. This method leads to the so-called "Little Higgs" models. The ATLAS experiment at LHC has undertaken studies of the new particles predicted by these model: a heavy top quark, heavy gauge bosons and additional Higgs bosons. Simulations of their decays have been carried out. The sensitivity of the ATLAS experiment to discover these new particles is discussed.
|
hep-ph/0411347
|
Christian Fischer
|
C. S. Fischer and R. Alkofer
|
Dynamical Chiral Symmetry Breaking in Landau gauge QCD
|
4 pages, 2 figures, talk given by C.F. at 6th Conference on Quark
Confinement and the Hadron Spectrum, Villasimius, Sardinia, Italy, 21-25 Sep
2004
|
AIPConf.Proc.756:275-277,2005
|
10.1063/1.1920965
|
UNITU-THEP-16/2004, IPPP/04/75, DCPT/04/150
|
hep-ph
| null |
We summarise results for the propagators of Landau gauge QCD from the Green's
functions approach and lattice calculations. The nonperturbative solutions for
the ghost, gluon and quark propagators from a coupled set of Dyson-Schwinger
equations agree almost quantitatively with corresponding lattice results.
Similar unquenching effects are found in both approaches. The dynamically
generated quark masses are close to `phenomenological' values. The chiral
condensate is found to be large.
|
[
{
"created": "Fri, 26 Nov 2004 16:57:09 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Fischer",
"C. S.",
""
],
[
"Alkofer",
"R.",
""
]
] |
We summarise results for the propagators of Landau gauge QCD from the Green's functions approach and lattice calculations. The nonperturbative solutions for the ghost, gluon and quark propagators from a coupled set of Dyson-Schwinger equations agree almost quantitatively with corresponding lattice results. Similar unquenching effects are found in both approaches. The dynamically generated quark masses are close to `phenomenological' values. The chiral condensate is found to be large.
|
hep-ph/0210012
|
Alexander S. Sakharov
|
Maxim Yu. Khlopov, Sergei G. Rubin and Alexander S. Sakharov
|
Antimatter regions in the baryon-dominated Universe
|
Talk given at the XIVth Rencontres de Blois 2002 on Matter-Antimatter
Asymmetry, Blois, France, June, 2002, to be published in the proceedings, ed.
J. Tran Thanh Van, 4 latex pages, 2 eps figures
| null | null |
CERN-TH/2002-265
|
hep-ph astro-ph hep-th
| null |
Quantum fluctuations of a complex, baryonic charged scalar field caused by
inflation can generate large domains, which convert later into antimatter
regions. As a result the Universe can become globally matter-dominated, with
minor contribution of antimatter regions. The distribution and evolution of
such antimatter regions could cause every galaxy to be a harbour of an
anti-star globular cluster. At the same time, the scenario does not lead to
large-scale isocuvature perturbations, which would disturb observable CMB
anisotropy. The existence of one of such antistar globular cluster in our
Galaxy does not contradict the observed $\gamma$-ray background, but the
expected fluxes of $\bar{\rm ^4He}$ and $\bar{\rm ^3He}$ from such an
antimatter object are definitely accessible to the sensitivity of the coming
AMS--02 experiment.
|
[
{
"created": "Tue, 1 Oct 2002 17:22:19 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Khlopov",
"Maxim Yu.",
""
],
[
"Rubin",
"Sergei G.",
""
],
[
"Sakharov",
"Alexander S.",
""
]
] |
Quantum fluctuations of a complex, baryonic charged scalar field caused by inflation can generate large domains, which convert later into antimatter regions. As a result the Universe can become globally matter-dominated, with minor contribution of antimatter regions. The distribution and evolution of such antimatter regions could cause every galaxy to be a harbour of an anti-star globular cluster. At the same time, the scenario does not lead to large-scale isocuvature perturbations, which would disturb observable CMB anisotropy. The existence of one of such antistar globular cluster in our Galaxy does not contradict the observed $\gamma$-ray background, but the expected fluxes of $\bar{\rm ^4He}$ and $\bar{\rm ^3He}$ from such an antimatter object are definitely accessible to the sensitivity of the coming AMS--02 experiment.
|
1211.4835
|
Diogo Buarque Franzosi
|
Diogo Buarque Franzosi, Fabio Maltoni, Cen Zhang
|
Effective field theory approach to the Higgs lineshape
|
15 pages, 16 figures
| null |
10.1103/PhysRevD.87.053015
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The phenomenology of unstable particles, including searches and exclusion
limits at the LHC, depends significantly on its lineshape. When the width of
the resonance is large with respect to its mass, off-shell effects become
relevant and the very same definition of width becomes non trivial. Taking a
heavy Higgs boson as an example, we propose a new formulation to describe the
lineshape via an effective field theory approach. Our method leads to
amplitudes that are gauge invariant, respect unitarity and can appropriately
describe the lineshape of broad resonances. The application of the method to
the following relevant processes for the LHC phenomenology have been
considered: gluon fusion, vector boson scattering and $t\bar{t}$ production via
weak boson fusion.
|
[
{
"created": "Tue, 20 Nov 2012 19:24:57 GMT",
"version": "v1"
}
] |
2013-03-27
|
[
[
"Franzosi",
"Diogo Buarque",
""
],
[
"Maltoni",
"Fabio",
""
],
[
"Zhang",
"Cen",
""
]
] |
The phenomenology of unstable particles, including searches and exclusion limits at the LHC, depends significantly on its lineshape. When the width of the resonance is large with respect to its mass, off-shell effects become relevant and the very same definition of width becomes non trivial. Taking a heavy Higgs boson as an example, we propose a new formulation to describe the lineshape via an effective field theory approach. Our method leads to amplitudes that are gauge invariant, respect unitarity and can appropriately describe the lineshape of broad resonances. The application of the method to the following relevant processes for the LHC phenomenology have been considered: gluon fusion, vector boson scattering and $t\bar{t}$ production via weak boson fusion.
|
hep-ph/0307130
|
Alfonso Zerwekh
|
Alfonso R. Zerwekh
|
Effective Description of a Gauge Field and a Tower of Massive Vector
Resonances
| null | null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this work we review an effective description of the interaction of a gauge
field with a tower of massive vector fields by introducing a non-diagonal mass
matrix in a gauge invariant way. Particular cases of the method with only one
vector resonance have been used by the author elsewhere, nevertheless in this
paper the method is developed in a general way and and we proof its main
features for an arbitrary number of vector resonances. Additionally, we show
how to couple the vector resonances with fermions. We find that the method can
be useful in order to describe the low energy phenomenology of scenarios like
Kaluza-Klein resonances of usual gauge bosons or Technicolor vector resonances
and detailed examples are provided.
|
[
{
"created": "Wed, 9 Jul 2003 14:48:36 GMT",
"version": "v1"
},
{
"created": "Sat, 29 Aug 2009 23:58:20 GMT",
"version": "v2"
}
] |
2009-08-30
|
[
[
"Zerwekh",
"Alfonso R.",
""
]
] |
In this work we review an effective description of the interaction of a gauge field with a tower of massive vector fields by introducing a non-diagonal mass matrix in a gauge invariant way. Particular cases of the method with only one vector resonance have been used by the author elsewhere, nevertheless in this paper the method is developed in a general way and and we proof its main features for an arbitrary number of vector resonances. Additionally, we show how to couple the vector resonances with fermions. We find that the method can be useful in order to describe the low energy phenomenology of scenarios like Kaluza-Klein resonances of usual gauge bosons or Technicolor vector resonances and detailed examples are provided.
|
hep-ph/9811316
|
Hsin-Chia Cheng
|
Hsin-Chia Cheng, Bogdan A. Dobrescu and Konstantin T. Matchev
|
Generic and Chiral Extensions of the Supersymmetric Standard Model
|
33 pages, 2 figures, LaTeX
|
Nucl.Phys.B543:47-72,1999
|
10.1016/S0550-3213(99)00012-7
|
Fermilab-PUB-98/357-T
|
hep-ph
| null |
We construct extensions of the Standard Model in which the gauge symmetries
and supersymmetry prevent the dangerously large effects that may potentially be
induced in a supersymmetric standard model by Planck scale physics. These
include baryon number violation, flavor changing neutral currents, the $\mu$
term, and masses for singlet or vector-like fields under the Standard Model
gauge group. For this purpose we introduce an extra non-anomalous $U(1)_\mu$
gauge group. Dynamical supersymmetry breaking in a secluded sector triggers the
breaking of the $U(1)_\mu$ and generates soft masses for the superpartners via
gauge mediation, with the scalars possibly receiving sizable contributions from
the $U(1)_\mu$ D-term. We find several classes of complete and calculable
models, in which the messengers do not present cosmological problems and
neutrino masses can also be accomodated. We derive the sparticle spectrum in
these models and study the phenomenological consequences. We give an exhaustive
list of the potential experimental signatures and discuss their observability
in the upcoming Tevatron runs. One class of models exhibits interesting new
discovery channels, namely $WW \not E_T$, $W\gamma \not E_T$ and $WZ \not E_T$,
which arise when the next-to-lightest supersymmetric particle is a short-lived
$SU(2)_W$ neutralino.
|
[
{
"created": "Thu, 12 Nov 1998 23:34:34 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Cheng",
"Hsin-Chia",
""
],
[
"Dobrescu",
"Bogdan A.",
""
],
[
"Matchev",
"Konstantin T.",
""
]
] |
We construct extensions of the Standard Model in which the gauge symmetries and supersymmetry prevent the dangerously large effects that may potentially be induced in a supersymmetric standard model by Planck scale physics. These include baryon number violation, flavor changing neutral currents, the $\mu$ term, and masses for singlet or vector-like fields under the Standard Model gauge group. For this purpose we introduce an extra non-anomalous $U(1)_\mu$ gauge group. Dynamical supersymmetry breaking in a secluded sector triggers the breaking of the $U(1)_\mu$ and generates soft masses for the superpartners via gauge mediation, with the scalars possibly receiving sizable contributions from the $U(1)_\mu$ D-term. We find several classes of complete and calculable models, in which the messengers do not present cosmological problems and neutrino masses can also be accomodated. We derive the sparticle spectrum in these models and study the phenomenological consequences. We give an exhaustive list of the potential experimental signatures and discuss their observability in the upcoming Tevatron runs. One class of models exhibits interesting new discovery channels, namely $WW \not E_T$, $W\gamma \not E_T$ and $WZ \not E_T$, which arise when the next-to-lightest supersymmetric particle is a short-lived $SU(2)_W$ neutralino.
|
1309.3062
|
Thibault de Boissi\`ere
|
Thibault de Boissi\`ere (for the EDELWEISS experiment)
|
Searches for axions with the EDELWEISS experiment
|
4 pages, 4 figures, to appear in the proceedings of the 25th
"Rencontres de Blois", Blois, France, May 27-31, 2013
| null | null | null |
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The EDELWEISS experiment primarily aims at the direct detection of WIMPs
using germanium bolometers. It is also sensitive to the low-energy electron
recoils that would be induced by axions. We present new constraints on the
couplings of axions using data from the EDELWEISS-II experiment. Using a total
exposure of up to 448~kg.d, we searched for axion-induced electron recoils down
to 2.5~keV within four scenarios involving different hypotheses on the origin
and couplings of axions. We set a 95~\% CL limit on the coupling to photons
$g_{A\gamma}<2.15\times 10^{-9}$~GeV$^{-1}$ in a mass range not fully covered
by axion helioscopes. We constrain the coupling to electrons, $g_{Ae} <
2.59\times 10^{-11}$, similar to the more indirect solar neutrino bound.
Finally we place a limit on $g_{Ae}\times g_{AN}^{\rm eff}<4.82 \times
10^{-17}$, where $g_{AN}^{\rm eff}$ is the effective axion-nucleon coupling for
$^{57}$Fe. Combining these results we fully exclude the mass range $0.91\,{\rm
eV}<m_A<80$~keV for DFSZ axions and $5.73\,{\rm eV}<m_A<40$~keV for KSVZ
axions.
|
[
{
"created": "Thu, 12 Sep 2013 08:54:49 GMT",
"version": "v1"
}
] |
2019-08-14
|
[
[
"de Boissière",
"Thibault",
"",
"for the EDELWEISS experiment"
]
] |
The EDELWEISS experiment primarily aims at the direct detection of WIMPs using germanium bolometers. It is also sensitive to the low-energy electron recoils that would be induced by axions. We present new constraints on the couplings of axions using data from the EDELWEISS-II experiment. Using a total exposure of up to 448~kg.d, we searched for axion-induced electron recoils down to 2.5~keV within four scenarios involving different hypotheses on the origin and couplings of axions. We set a 95~\% CL limit on the coupling to photons $g_{A\gamma}<2.15\times 10^{-9}$~GeV$^{-1}$ in a mass range not fully covered by axion helioscopes. We constrain the coupling to electrons, $g_{Ae} < 2.59\times 10^{-11}$, similar to the more indirect solar neutrino bound. Finally we place a limit on $g_{Ae}\times g_{AN}^{\rm eff}<4.82 \times 10^{-17}$, where $g_{AN}^{\rm eff}$ is the effective axion-nucleon coupling for $^{57}$Fe. Combining these results we fully exclude the mass range $0.91\,{\rm eV}<m_A<80$~keV for DFSZ axions and $5.73\,{\rm eV}<m_A<40$~keV for KSVZ axions.
|
2402.18635
|
Stefano Forte
|
The NNPDF Collaboration: Richard D. Ball, Andrea Barontini, Alessandro
Candido, Stefano Carrazza, Juan Cruz-Martinez, Luigi Del Debbio, Stefano
Forte, Tommaso Giani, Felix Hekhorn, Zahari Kassabov, Niccol\`o Laurenti,
Giacomo Magni, Emanuele R. Nocera, Tanjona R. Rabemananjara, Juan Rojo,
Christopher Schwan, Roy Stegeman and Maria Ubiali
|
The Path to N$^3$LO Parton Distributions
|
63 pages, 41 figures. Final version, as published in EPJC. Various
clarifications added. Fig 2.9 and Tab. 4.6, 5.1 and 5.2 added. In particular,
comparison to approximate YR4 estimate of PDF uncertainties added (Tab 4.1,
4.2 and associate discussion in sect. 5)
| null | null |
Nikhef-2023-020, TIF-UNIMI-2023-23, Edinburgh 2023/29
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We extend the existing leading (LO), next-to-leading (NLO), and
next-to-next-to-leading order (NNLO) NNPDF4.0 sets of parton distribution
functions (PDFs) to approximate next-to-next-to-next-to-leading order
(aN$^3$LO). We construct an approximation to the N$^3$LO splitting functions
that includes all available partial information from both fixed-order
computations and from small and large $x$ resummation, and estimate the
uncertainty on this approximation by varying the set of basis functions used to
construct the approximation. We include known N$^3$LO corrections to
deep-inelastic scattering structure functions and extend the FONLL general-mass
scheme to $\mathcal{O}\left( \alpha_s^3\right)$ accuracy. We determine a set of
aN$^3$LO PDFs by accounting both for the uncertainty on splitting functions due
to the incomplete knowledge of N$^3$LO terms, and to the uncertainty related to
missing higher corrections (MHOU), estimated by scale variation, through a
theory covariance matrix formalism. We assess the perturbative stability of the
resulting PDFs, we study the impact of MHOUs on them, and we compare our
results to the aN$^3$LO PDFs from the MSHT group. We examine the
phenomenological impact of aN$^3$LO corrections on parton luminosities at the
LHC, and give a first assessment of the impact of aN$^3$LO PDFs on the Higgs
and Drell-Yan total production cross-sections. We find that the aN$^3$LO
NNPDF4.0 PDFs are consistent within uncertainties with their NNLO counterparts,
that they improve the description of the global dataset and the perturbative
convergence of Higgs and Drell-Yan cross-sections, and that MHOUs on PDFs
decrease substantially with the increase of perturbative order.
|
[
{
"created": "Wed, 28 Feb 2024 19:00:01 GMT",
"version": "v1"
},
{
"created": "Fri, 5 Jul 2024 09:26:50 GMT",
"version": "v2"
}
] |
2024-07-08
|
[
[
"The NNPDF Collaboration",
"",
""
],
[
"Ball",
"Richard D.",
""
],
[
"Barontini",
"Andrea",
""
],
[
"Candido",
"Alessandro",
""
],
[
"Carrazza",
"Stefano",
""
],
[
"Cruz-Martinez",
"Juan",
""
],
[
"Del Debbio",
"Luigi",
""
],
[
"Forte",
"Stefano",
""
],
[
"Giani",
"Tommaso",
""
],
[
"Hekhorn",
"Felix",
""
],
[
"Kassabov",
"Zahari",
""
],
[
"Laurenti",
"Niccolò",
""
],
[
"Magni",
"Giacomo",
""
],
[
"Nocera",
"Emanuele R.",
""
],
[
"Rabemananjara",
"Tanjona R.",
""
],
[
"Rojo",
"Juan",
""
],
[
"Schwan",
"Christopher",
""
],
[
"Stegeman",
"Roy",
""
],
[
"Ubiali",
"Maria",
""
]
] |
We extend the existing leading (LO), next-to-leading (NLO), and next-to-next-to-leading order (NNLO) NNPDF4.0 sets of parton distribution functions (PDFs) to approximate next-to-next-to-next-to-leading order (aN$^3$LO). We construct an approximation to the N$^3$LO splitting functions that includes all available partial information from both fixed-order computations and from small and large $x$ resummation, and estimate the uncertainty on this approximation by varying the set of basis functions used to construct the approximation. We include known N$^3$LO corrections to deep-inelastic scattering structure functions and extend the FONLL general-mass scheme to $\mathcal{O}\left( \alpha_s^3\right)$ accuracy. We determine a set of aN$^3$LO PDFs by accounting both for the uncertainty on splitting functions due to the incomplete knowledge of N$^3$LO terms, and to the uncertainty related to missing higher corrections (MHOU), estimated by scale variation, through a theory covariance matrix formalism. We assess the perturbative stability of the resulting PDFs, we study the impact of MHOUs on them, and we compare our results to the aN$^3$LO PDFs from the MSHT group. We examine the phenomenological impact of aN$^3$LO corrections on parton luminosities at the LHC, and give a first assessment of the impact of aN$^3$LO PDFs on the Higgs and Drell-Yan total production cross-sections. We find that the aN$^3$LO NNPDF4.0 PDFs are consistent within uncertainties with their NNLO counterparts, that they improve the description of the global dataset and the perturbative convergence of Higgs and Drell-Yan cross-sections, and that MHOUs on PDFs decrease substantially with the increase of perturbative order.
|
2203.08056
|
Cora Dvorkin
|
Cora Dvorkin, Siddharth Mishra-Sharma, Brian Nord, V. Ashley Villar,
Camille Avestruz, Keith Bechtol, Aleksandra \'Ciprijanovi\'c, Andrew J.
Connolly, Lehman H. Garrison, Gautham Narayan, and Francisco
Villaescusa-Navarro
|
Machine Learning and Cosmology
|
Contribution to Snowmass 2021. 32 pages
| null | null | null |
hep-ph astro-ph.CO astro-ph.IM cs.LG stat.ML
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Methods based on machine learning have recently made substantial inroads in
many corners of cosmology. Through this process, new computational tools, new
perspectives on data collection, model development, analysis, and discovery, as
well as new communities and educational pathways have emerged. Despite rapid
progress, substantial potential at the intersection of cosmology and machine
learning remains untapped. In this white paper, we summarize current and
ongoing developments relating to the application of machine learning within
cosmology and provide a set of recommendations aimed at maximizing the
scientific impact of these burgeoning tools over the coming decade through both
technical development as well as the fostering of emerging communities.
|
[
{
"created": "Tue, 15 Mar 2022 16:50:46 GMT",
"version": "v1"
}
] |
2022-03-16
|
[
[
"Dvorkin",
"Cora",
""
],
[
"Mishra-Sharma",
"Siddharth",
""
],
[
"Nord",
"Brian",
""
],
[
"Villar",
"V. Ashley",
""
],
[
"Avestruz",
"Camille",
""
],
[
"Bechtol",
"Keith",
""
],
[
"Ćiprijanović",
"Aleksandra",
""
],
[
"Connolly",
"Andrew J.",
""
],
[
"Garrison",
"Lehman H.",
""
],
[
"Narayan",
"Gautham",
""
],
[
"Villaescusa-Navarro",
"Francisco",
""
]
] |
Methods based on machine learning have recently made substantial inroads in many corners of cosmology. Through this process, new computational tools, new perspectives on data collection, model development, analysis, and discovery, as well as new communities and educational pathways have emerged. Despite rapid progress, substantial potential at the intersection of cosmology and machine learning remains untapped. In this white paper, we summarize current and ongoing developments relating to the application of machine learning within cosmology and provide a set of recommendations aimed at maximizing the scientific impact of these burgeoning tools over the coming decade through both technical development as well as the fostering of emerging communities.
|
hep-ph/0511018
|
Alexandre Kisselev
|
A.V. Kisselev and V.A. Petrov
|
Kaluza-Klein gravitons at the LHC and in extensive air showers
|
8 pages, 4 figures, talk given at the International Conference on
Interconnection between High Energy Physics and Astroparticle Physics: From
Colliders to Cosmic Rays, 7-13 September 2005, Prague, Czech Republic
|
Czech.J.Phys. 56 (2006) A91-A97
|
10.1007/s10582-006-0145-z
| null |
hep-ph astro-ph
| null |
The small curvature option of the Randall-Sundrum model with two branes is
considered which has almost continuous spectrum of low-mass Kaluza-Klein
gravitons. It is shown that gravity effects related with these excitations can
be detected in double diffractive events at the LHC and in inclined air showers
induced by interactions of cosmic neutrinos with atmospheric nucleons at
ultra-high energies.
|
[
{
"created": "Wed, 2 Nov 2005 13:32:21 GMT",
"version": "v1"
}
] |
2015-06-25
|
[
[
"Kisselev",
"A. V.",
""
],
[
"Petrov",
"V. A.",
""
]
] |
The small curvature option of the Randall-Sundrum model with two branes is considered which has almost continuous spectrum of low-mass Kaluza-Klein gravitons. It is shown that gravity effects related with these excitations can be detected in double diffractive events at the LHC and in inclined air showers induced by interactions of cosmic neutrinos with atmospheric nucleons at ultra-high energies.
|
2303.04999
|
Chia-Min Lin
|
Chia-Min Lin
|
Uniform Rate Inflation
|
9 pages, 2 figures, to be published in JCAP
| null |
10.1088/1475-7516/2023/04/037
| null |
hep-ph astro-ph.CO hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this work, I consider an inflation model with a quadratic potential and a
negative cosmological constant. An analytical solution of the equation of
motion for the inflaton field is found without slow-roll approximation. The
result is that the inflation field is rolling at a constant speed. The
prediction for cosmological perturbation is calculated.
|
[
{
"created": "Thu, 9 Mar 2023 02:44:29 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Apr 2023 06:39:09 GMT",
"version": "v2"
}
] |
2023-04-19
|
[
[
"Lin",
"Chia-Min",
""
]
] |
In this work, I consider an inflation model with a quadratic potential and a negative cosmological constant. An analytical solution of the equation of motion for the inflaton field is found without slow-roll approximation. The result is that the inflation field is rolling at a constant speed. The prediction for cosmological perturbation is calculated.
|
1803.09748
|
Jose Manuel Alarc\'on
|
J. M. Alarc\'on, C. Weiss
|
Accurate nucleon electromagnetic form factors from dispersively improved
chiral effective field theory
|
5 pages, 3 figures, 2 tables
| null |
10.1016/j.physletb.2018.07.060
|
JLAB-THY-18-2675
|
hep-ph hep-lat nucl-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a theoretical parametrization of the nucleon electromagnetic form
factors (FFs) based on a combination of chiral effective field theory and
dispersion analysis. The isovector spectral functions on the two-pion cut are
computed using elastic unitarity, chiral pion-nucleon amplitudes, and timelike
pion FF data. Higher-mass isovector and isoscalar t-channel states are
described by effective poles, whose strength is fixed by sum rules (charges,
radii). Excellent agreement with the spacelike proton and neutron FF data is
achieved up to Q^2 \sim 1 GeV^2. Our parametrization provides proper
analyticity and theoretical uncertainty estimates and can be used for low-Q^2
FF studies and proton radius extraction.
|
[
{
"created": "Mon, 26 Mar 2018 18:00:00 GMT",
"version": "v1"
}
] |
2018-08-15
|
[
[
"Alarcón",
"J. M.",
""
],
[
"Weiss",
"C.",
""
]
] |
We present a theoretical parametrization of the nucleon electromagnetic form factors (FFs) based on a combination of chiral effective field theory and dispersion analysis. The isovector spectral functions on the two-pion cut are computed using elastic unitarity, chiral pion-nucleon amplitudes, and timelike pion FF data. Higher-mass isovector and isoscalar t-channel states are described by effective poles, whose strength is fixed by sum rules (charges, radii). Excellent agreement with the spacelike proton and neutron FF data is achieved up to Q^2 \sim 1 GeV^2. Our parametrization provides proper analyticity and theoretical uncertainty estimates and can be used for low-Q^2 FF studies and proton radius extraction.
|
hep-ph/9903435
|
Anjan Joshipura
|
Anjan S. Joshipura and Sudhir K. Vempati
|
Sneutrino Vacuum Expectation Values and Neutrino Anomalies Through
Trilinear R-parity Violation
|
References added and typos corrected
|
Phys.Rev.D60:111303,1999
|
10.1103/PhysRevD.60.111303
|
PRL-TH-99/001
|
hep-ph
| null |
Neutrino mass spectrum is reanalyzed in supersymmetric models with explicit
trilinear $R$ violation. Models in this category are argued to provide
simultaneous solution to the solar and atmospheric neutrino anomalies. It is
shown specifically that large mixing and hierarchical masses needed for the
vacuum solution of neutrino anomalies arise naturally in these models without
requiring any additional symmetries or hierarchies among the trilinear
couplings.
|
[
{
"created": "Mon, 22 Mar 1999 11:15:24 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Apr 1999 11:55:34 GMT",
"version": "v2"
}
] |
2009-12-30
|
[
[
"Joshipura",
"Anjan S.",
""
],
[
"Vempati",
"Sudhir K.",
""
]
] |
Neutrino mass spectrum is reanalyzed in supersymmetric models with explicit trilinear $R$ violation. Models in this category are argued to provide simultaneous solution to the solar and atmospheric neutrino anomalies. It is shown specifically that large mixing and hierarchical masses needed for the vacuum solution of neutrino anomalies arise naturally in these models without requiring any additional symmetries or hierarchies among the trilinear couplings.
|
hep-ph/9811271
|
Johannes Bluemlein
|
Johannes Bl\"umlein, Edward Boos, and Alexander Kryukov
|
Leptoquark Pair Production Cross Sections at Hadron Colliders
|
1 reference changed
| null | null |
DESY 97-067
|
hep-ph
| null |
A compilation is given of the pair production cross sections for scalar and
vector leptoquarks in the kinematic range of the hadron colliders Tevatron and
LHC.
|
[
{
"created": "Sat, 7 Nov 1998 21:54:07 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Nov 1998 15:43:57 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Blümlein",
"Johannes",
""
],
[
"Boos",
"Edward",
""
],
[
"Kryukov",
"Alexander",
""
]
] |
A compilation is given of the pair production cross sections for scalar and vector leptoquarks in the kinematic range of the hadron colliders Tevatron and LHC.
|
hep-ph/0007293
|
Steven D. Bass
|
Steven D. Bass, Stefan Wetzel and Wolfram Weise
|
Axial U(1) dynamics in eta and eta' photoproduction
|
19 pages, 9 figures
|
Nucl.Phys. A686 (2001) 429-446
|
10.1016/S0375-9474(00)00574-1
|
TUM/T39-00-09, ECT-00-006
|
hep-ph
| null |
We discuss the sensitivity of eta and eta' photoproduction near threshold to
the gluonic OZI breaking parameters in the U_A(1)-extended effective chiral
Lagrangian for low-energy QCD. Our coupled-channels analysis hints at a strong
correlation between the gluon-induced contributions to the eta' mass and the
low-energy pp -> pp eta' reaction and the near-threshold behaviour of the gamma
p -> eta p cross-section.
|
[
{
"created": "Wed, 26 Jul 2000 11:59:48 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Bass",
"Steven D.",
""
],
[
"Wetzel",
"Stefan",
""
],
[
"Weise",
"Wolfram",
""
]
] |
We discuss the sensitivity of eta and eta' photoproduction near threshold to the gluonic OZI breaking parameters in the U_A(1)-extended effective chiral Lagrangian for low-energy QCD. Our coupled-channels analysis hints at a strong correlation between the gluon-induced contributions to the eta' mass and the low-energy pp -> pp eta' reaction and the near-threshold behaviour of the gamma p -> eta p cross-section.
|
hep-ph/9410233
|
John Terning
|
John Terning
|
Chiral Technicolor and Precision Electroweak Measurements
|
19 pages, LaTeX, BUHEP-94-27
|
Phys.Lett.B344:279-286,1995
|
10.1016/0370-2693(94)01506-8
| null |
hep-ph
| null |
I consider the possibility that electroweak symmetry is broken by a strongly
interacting chiral gauge theory. I argue that some of the discrepancies between
precision electroweak measurements and the predictions of QCD-like technicolor
models can be resolved if technicolor is a chiral gauge theory. I present a toy
technicolor model which demonstrates this idea, and gives $ m_t \gg m_b$, with
a small value for $\Delta\rho_* \equiv \alpha T $, and small corrections to $Z
\rightarrow b \overline{b}$.
|
[
{
"created": "Thu, 6 Oct 1994 17:35:51 GMT",
"version": "v1"
}
] |
2014-11-17
|
[
[
"Terning",
"John",
""
]
] |
I consider the possibility that electroweak symmetry is broken by a strongly interacting chiral gauge theory. I argue that some of the discrepancies between precision electroweak measurements and the predictions of QCD-like technicolor models can be resolved if technicolor is a chiral gauge theory. I present a toy technicolor model which demonstrates this idea, and gives $ m_t \gg m_b$, with a small value for $\Delta\rho_* \equiv \alpha T $, and small corrections to $Z \rightarrow b \overline{b}$.
|
hep-ph/9502321
| null |
W. Buchmuller, Z. Fodor and A. Hebecker
|
THERMODYNAMICS OF THE ELECTROWEAK PHASE TRANSITION
|
22 pages, 9 figures (as .uu files), ps file available by anonymous
ftp at ftp://x4u2.desy.de/pub/preprints/desy/1995/desy95-028.ps
|
Nucl.Phys.B447:317-339,1995
|
10.1016/0550-3213(95)00254-P
|
DESY 95-028
|
hep-ph hep-lat
| null |
We discuss several general aspects of the free energy of the standard model
at high temperatures. In particular the Clausius-Clapeyron equation is shown to
yield a relation between the latent heat and the jump in the order parameter.
The free energy is calculated as function of temperature in resummed
perturbation theory to two-loop order. A new resummation procedure is proposed
in which the symmetric phase and the Higgs phase are treated differently. A
quantitative description of the phase transition is achieved for Higgs masses
below $\sim 70$ GeV. The results are found to be in agreement with recent
numerical simulations on large lattices. The phase transition provides no
evidence for strong non-perturbative effects in the symmetric phase.
|
[
{
"created": "Thu, 16 Feb 1995 14:10:23 GMT",
"version": "v1"
}
] |
2016-09-01
|
[
[
"Buchmuller",
"W.",
""
],
[
"Fodor",
"Z.",
""
],
[
"Hebecker",
"A.",
""
]
] |
We discuss several general aspects of the free energy of the standard model at high temperatures. In particular the Clausius-Clapeyron equation is shown to yield a relation between the latent heat and the jump in the order parameter. The free energy is calculated as function of temperature in resummed perturbation theory to two-loop order. A new resummation procedure is proposed in which the symmetric phase and the Higgs phase are treated differently. A quantitative description of the phase transition is achieved for Higgs masses below $\sim 70$ GeV. The results are found to be in agreement with recent numerical simulations on large lattices. The phase transition provides no evidence for strong non-perturbative effects in the symmetric phase.
|
2107.01293
|
Johannes Bl\"umlein
|
J. Bl\"umlein and M. Saragnese
|
The N$^3$LO Scheme-invariant QCD Evolution of the Non-singlet Structure
Functions \boldmath $F^{\rm NS}_2(x,Q^2)$ and $g_1^{\rm NS}(x,Q^2)$
|
14 pages Latex, 12 figures
| null |
10.1016/j.physletb.2021.136589
|
DESY 21--096, DO--TH 21/21, SAGEX--21--13--E
|
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
We present the scheme-invariant unpolarized and polarized flavor non-singlet
evolution equation to N$^3$LO for the structure functions $F_2(x,Q^2)$ and
$g_1(x,Q^2)$ including the charm- and bottom quark effects in the asymptotic
representation. The corresponding evolution is based on the experimental
measurement of the non-singlet structure functions at a starting scale $Q_0^2$.
In this way the evolution does only depend on the strong coupling constant
$\alpha_s(M_Z)$ or the QCD scale $\Lambda_{\rm QCD}$ and the charm and bottom
quark masses $m_c$ and $m_b$ and provides one of the cleanest ways to measure
the strong coupling constant in future high luminosity deep-inelastic
scattering experiments. The yet unknown parts of the 4-loop anomalous
dimensions introduce only a marginal error in this analysis.
|
[
{
"created": "Fri, 2 Jul 2021 22:13:55 GMT",
"version": "v1"
}
] |
2021-09-15
|
[
[
"Blümlein",
"J.",
""
],
[
"Saragnese",
"M.",
""
]
] |
We present the scheme-invariant unpolarized and polarized flavor non-singlet evolution equation to N$^3$LO for the structure functions $F_2(x,Q^2)$ and $g_1(x,Q^2)$ including the charm- and bottom quark effects in the asymptotic representation. The corresponding evolution is based on the experimental measurement of the non-singlet structure functions at a starting scale $Q_0^2$. In this way the evolution does only depend on the strong coupling constant $\alpha_s(M_Z)$ or the QCD scale $\Lambda_{\rm QCD}$ and the charm and bottom quark masses $m_c$ and $m_b$ and provides one of the cleanest ways to measure the strong coupling constant in future high luminosity deep-inelastic scattering experiments. The yet unknown parts of the 4-loop anomalous dimensions introduce only a marginal error in this analysis.
|
hep-ph/0306180
|
Asmaa Abada
|
Asmaa Abada and Marta Losada
|
Leptogenesis with four gauge singlets
|
13 pages, 9 PS figures, REVTeX
|
Nucl.Phys. B673 (2003) 319-330
|
10.1016/j.nuclphysb.2003.09.030
|
LPT Orsay/03-40, CI-UAN 02-15T
|
hep-ph
| null |
We consider a generic type of leptogenesis model which can successfully
produce the correct value of the observed baryon number to entropy ratio. The
main feature of this model is that it is a simple TeV scale model, a scale
accessible in near future machines, with a minimal particle content. Both
supersymmetric and non-supersymmetric versions of the model are feasible. This
model also gives left-handed neutrino masses compatible with all current data
from direct and indirect neutrino experiments.
|
[
{
"created": "Thu, 19 Jun 2003 17:16:51 GMT",
"version": "v1"
}
] |
2010-04-05
|
[
[
"Abada",
"Asmaa",
""
],
[
"Losada",
"Marta",
""
]
] |
We consider a generic type of leptogenesis model which can successfully produce the correct value of the observed baryon number to entropy ratio. The main feature of this model is that it is a simple TeV scale model, a scale accessible in near future machines, with a minimal particle content. Both supersymmetric and non-supersymmetric versions of the model are feasible. This model also gives left-handed neutrino masses compatible with all current data from direct and indirect neutrino experiments.
|
2207.05015
|
Francesco Giovanni Celiberto
|
Francesco Giovanni Celiberto, Alessandro Papa
|
Mueller-Navelet jets at the LHC: hunting data with azimuthal
distributions
|
26 pages, 9 figures, 246 references, version published in Phys. Rev.
D
|
Phys. Rev. D 106 (2022) 11, 114004
|
10.1103/PhysRevD.106.114004
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
By making use of the hybrid collinear and high-energy factorization, where
the BFKL resummation of leading and next-to-leading energy logarithms is
combined with the standard description in terms of collinear parton densities,
we compare predictions for Mueller-Navelet jet rapidity and angular
differential rates with data collected by CMS at $\sqrt{s} = 7$ TeV. We provide
an evidence that the study of azimuthal distributions, calculated as a Fourier
sum of correlation moments and embodying the high-energy signal coming from all
conformal-spin modes, permits us to overcome the well-known issues emerging in
the description of Mueller-Navelet final states at natural values of the
renormalization scale. We come out with a clear indication that the
next-to-leading BFKL description of these observables at natural scales is
valid when the rapidity interval between the two jets is large, and it allows
us to catch the core high-energy dynamics emerging from data.
|
[
{
"created": "Mon, 11 Jul 2022 17:06:57 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Dec 2022 18:24:00 GMT",
"version": "v2"
}
] |
2022-12-07
|
[
[
"Celiberto",
"Francesco Giovanni",
""
],
[
"Papa",
"Alessandro",
""
]
] |
By making use of the hybrid collinear and high-energy factorization, where the BFKL resummation of leading and next-to-leading energy logarithms is combined with the standard description in terms of collinear parton densities, we compare predictions for Mueller-Navelet jet rapidity and angular differential rates with data collected by CMS at $\sqrt{s} = 7$ TeV. We provide an evidence that the study of azimuthal distributions, calculated as a Fourier sum of correlation moments and embodying the high-energy signal coming from all conformal-spin modes, permits us to overcome the well-known issues emerging in the description of Mueller-Navelet final states at natural values of the renormalization scale. We come out with a clear indication that the next-to-leading BFKL description of these observables at natural scales is valid when the rapidity interval between the two jets is large, and it allows us to catch the core high-energy dynamics emerging from data.
|
1512.03581
|
Pradipta Ghosh
|
Joydeep Chakrabortty, Pradipta Ghosh, Subhadeep Mondal, Tripurari
Srivastava
|
Reconciling $(g-2)_\mu$ and charged lepton flavour violating processes
through a doubly charged scalar
|
17 pages double column, 8 .pdf figures, pdflatex, matches with the
published version in Physical Review D
|
Phys. Rev. D 93, 115004 (2016)
|
10.1103/PhysRevD.93.115004
|
CPHT-RR054.1115, LPT-Orsay-15-89, HRI-RECAPP-2015-016
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this work, we investigate the phenomenological consequences of a doubly
charged scalar which may belong to different uncoloured scalar multiplets. This
doubly charged scalar couples to the charged leptons as well as gauge bosons,
which we parametrize in a model independent way. Restricting ourselves in the
regime of conserved charged-parity (CP), we assume only a few non-zero Yukawa
couplings ($y_{\mu \ell}$, where $\ell=e,\mu,\tau$) between the doubly charged
scalar and the charged leptons. Our choices allow the doubly charged scalar to
impinge low-energy processes like anomalous magnetic moment of muon and a few
possible charged lepton flavour violating (CLFV) processes. These same Yukawa
couplings are also instrumental in producing same-sign dilepton signatures at
the LHC. In this article we examine the impact of individual contributions from
the diagonal and off-diagonal Yukawa couplings in the light of muon $(g-2)$
excess. Subsequently, we use the derived information to inquire the possible
CLFV processes and finally the collider signals from the decay of a doubly
charged scalar. Our simplified analyses, depending on the mass of doubly
charged scalar, provide a good estimate for the magnitude of the concerned
Yukawa couplings. Our findings would appear resourceful to test the
phenomenological significance of a doubly charged scalar by using complementary
information from muon $(g-2)$, CLFV and the collider experiments.
|
[
{
"created": "Fri, 11 Dec 2015 10:35:02 GMT",
"version": "v1"
},
{
"created": "Mon, 16 May 2016 04:21:51 GMT",
"version": "v2"
},
{
"created": "Sun, 5 Jun 2016 20:52:01 GMT",
"version": "v3"
}
] |
2016-06-07
|
[
[
"Chakrabortty",
"Joydeep",
""
],
[
"Ghosh",
"Pradipta",
""
],
[
"Mondal",
"Subhadeep",
""
],
[
"Srivastava",
"Tripurari",
""
]
] |
In this work, we investigate the phenomenological consequences of a doubly charged scalar which may belong to different uncoloured scalar multiplets. This doubly charged scalar couples to the charged leptons as well as gauge bosons, which we parametrize in a model independent way. Restricting ourselves in the regime of conserved charged-parity (CP), we assume only a few non-zero Yukawa couplings ($y_{\mu \ell}$, where $\ell=e,\mu,\tau$) between the doubly charged scalar and the charged leptons. Our choices allow the doubly charged scalar to impinge low-energy processes like anomalous magnetic moment of muon and a few possible charged lepton flavour violating (CLFV) processes. These same Yukawa couplings are also instrumental in producing same-sign dilepton signatures at the LHC. In this article we examine the impact of individual contributions from the diagonal and off-diagonal Yukawa couplings in the light of muon $(g-2)$ excess. Subsequently, we use the derived information to inquire the possible CLFV processes and finally the collider signals from the decay of a doubly charged scalar. Our simplified analyses, depending on the mass of doubly charged scalar, provide a good estimate for the magnitude of the concerned Yukawa couplings. Our findings would appear resourceful to test the phenomenological significance of a doubly charged scalar by using complementary information from muon $(g-2)$, CLFV and the collider experiments.
|
hep-ph/0112345
|
Hiroshi Nunokawa
|
Takaaki Kajita, Hisakazu Minakata and Hiroshi Nunokawa
|
Method for Determination of $|U_{e3}|$ in Neutrino Oscillation
Appearance Experiments
|
15 pages, 3 figures, minor corrections, final version to appear in
PLB
|
Phys.Lett. B528 (2002) 245-252
|
10.1016/S0370-2693(02)01231-5
|
IFT-P.006/2002
|
hep-ph
| null |
We point out that determination of the MNS matrix element |U_{e3}| = s_{13}
in long-baseline \nu_{\mu} \to \nu_e neutrino oscillation experiments suffers
from large intrinsic uncertainty due to the unknown CP violating phase \delta
and sign of \Delta m^2_{13}. We propose a new strategy for accurate
determination of $\theta_{13}$; tune the beam energy at the oscillation maximum
and do the measurement both in neutrino and antineutrino channels. We show that
it automatically resolves the problem of parameter ambiguities which involves
\delta, \theta_{13}, and the sign of \Delta m^2_{13}.
|
[
{
"created": "Fri, 28 Dec 2001 10:11:11 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Feb 2002 18:09:32 GMT",
"version": "v2"
}
] |
2009-11-07
|
[
[
"Kajita",
"Takaaki",
""
],
[
"Minakata",
"Hisakazu",
""
],
[
"Nunokawa",
"Hiroshi",
""
]
] |
We point out that determination of the MNS matrix element |U_{e3}| = s_{13} in long-baseline \nu_{\mu} \to \nu_e neutrino oscillation experiments suffers from large intrinsic uncertainty due to the unknown CP violating phase \delta and sign of \Delta m^2_{13}. We propose a new strategy for accurate determination of $\theta_{13}$; tune the beam energy at the oscillation maximum and do the measurement both in neutrino and antineutrino channels. We show that it automatically resolves the problem of parameter ambiguities which involves \delta, \theta_{13}, and the sign of \Delta m^2_{13}.
|
0801.0958
|
Kazem Azizi
|
T. M. Aliev, K. Azizi, A. Ozpineci
|
QCD sum rules analysis of the $B_{s}\to D_{sJ}(2460)l\nu $ decay
|
Talk at the International Conference on Hadron Physics TROIA'07, 30
Aug. - 3 Sept. 2007, Canakkale, Turkey
| null | null | null |
hep-ph
| null |
Using three point QCD sum rules method, the form factors relevant to the
semileptonic
$B_{s}\to D_{sJ}(2460)\ell\nu$ decay are calculated. The $q^2$ dependencies
of these form factors are evaluated. The dependence of the asymmetry parameter
$\alpha$, characterizing the polarization of $D_{sJ}$ meson, on $q^2$ is
studied. This study gives useful information about the structure of the
$D_{sJ}$ meson. Finally the branching ratio of this decay is also estimated and
is shown that it can be easily detected at LHC.
|
[
{
"created": "Mon, 7 Jan 2008 12:30:24 GMT",
"version": "v1"
}
] |
2008-01-08
|
[
[
"Aliev",
"T. M.",
""
],
[
"Azizi",
"K.",
""
],
[
"Ozpineci",
"A.",
""
]
] |
Using three point QCD sum rules method, the form factors relevant to the semileptonic $B_{s}\to D_{sJ}(2460)\ell\nu$ decay are calculated. The $q^2$ dependencies of these form factors are evaluated. The dependence of the asymmetry parameter $\alpha$, characterizing the polarization of $D_{sJ}$ meson, on $q^2$ is studied. This study gives useful information about the structure of the $D_{sJ}$ meson. Finally the branching ratio of this decay is also estimated and is shown that it can be easily detected at LHC.
|
1007.4235
|
Kohei Kamada
|
Takeshi Chiba, Kohei Kamada, Shinta Kasuya, and Masahide Yamaguchi
|
Fate of thermal log type Q balls
|
10 pages, 7 figures, Ver.2, published version
|
Phys.Rev.D82:103534,2010
|
10.1103/PhysRevD.82.103534
|
RESCEU-17/10
|
hep-ph astro-ph.CO gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study time evolution of the $Q$ ball in thermal logarithmic potential
using lattice simulations. As the temperature decreases due to the cosmic
expansion, the thermal logarithmic term in the potential is eventually overcome
by a mass term, and we confirm that the $Q$ ball transforms from the thick-wall
type to the thin-wall type for a positive coefficient of radiative corrections
to the mass term, as recently suggested. Moreover, we find that the $Q$ ball
finally "melts down" when the $Q$-ball solution disappears. We also discuss the
effects of this phenomenon on the detectability of gravitational waves from the
$Q$-ball formation.
|
[
{
"created": "Sat, 24 Jul 2010 00:43:00 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Nov 2010 03:53:23 GMT",
"version": "v2"
}
] |
2010-12-23
|
[
[
"Chiba",
"Takeshi",
""
],
[
"Kamada",
"Kohei",
""
],
[
"Kasuya",
"Shinta",
""
],
[
"Yamaguchi",
"Masahide",
""
]
] |
We study time evolution of the $Q$ ball in thermal logarithmic potential using lattice simulations. As the temperature decreases due to the cosmic expansion, the thermal logarithmic term in the potential is eventually overcome by a mass term, and we confirm that the $Q$ ball transforms from the thick-wall type to the thin-wall type for a positive coefficient of radiative corrections to the mass term, as recently suggested. Moreover, we find that the $Q$ ball finally "melts down" when the $Q$-ball solution disappears. We also discuss the effects of this phenomenon on the detectability of gravitational waves from the $Q$-ball formation.
|
hep-ph/9306308
|
Kingman Cheung
|
kingman Cheung
|
Standard Model Higgs Boson at Linear Photon Colliders
|
(Talk given at the "Workshop on Physics and Experiments with Linear
$e^+e^-$ Collider", Waikoloa, Kona, Hawaii), LaTex, 7 pages, 4 figures not
inlcuded, NUHEP-TH-93-15
| null | null | null |
hep-ph
| null |
We will summarize some aspects of the standard model Higgs boson at high
energy $\gamma\gamma$ colliders, where the photon beams are realized by the
laser backscattering method, including the direct Higgs boson production via
$\gamma\gamma\rightarrow H$, and the measurement of the Yukawa coupling via the
channel $\gamma\gamma\rightarrow t\bar tH$.
|
[
{
"created": "Wed, 23 Jun 1993 18:39:21 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Cheung",
"kingman",
""
]
] |
We will summarize some aspects of the standard model Higgs boson at high energy $\gamma\gamma$ colliders, where the photon beams are realized by the laser backscattering method, including the direct Higgs boson production via $\gamma\gamma\rightarrow H$, and the measurement of the Yukawa coupling via the channel $\gamma\gamma\rightarrow t\bar tH$.
|
hep-ph/0102284
|
Maksim L. Nekrasov
|
M. L. Nekrasov
|
Gauge-invariant description of W-pair production in NLO approximation
|
7 pages, latex, 2 eps-figures. Talk presented at the Research
Workshop "Calculations for Modern and Future Colliders" Dubna, July 2000, and
at the XVth International Workshop "High Energy Physics and Quantum Field
Theory", Tver, September 2000
| null | null |
IHEP 2000-63
|
hep-ph
| null |
The processes $e^{+}e^{-} \to 4f(\gamma)$ mediated by W-pair (and single)
production are considered in the framework of the modified perturbation theory,
based on the expansion of probability in powers of the coupling constant
instead of amplitude. A full set of one-loop corrections to cross-section, and
two-loop corrections to self-energy of unstable particles are completely taken
into consideration. It is shown that the manifestly non-factorizable
corrections do not make contributions into the next-to-leading-order
approximation. Moreover, the colour reconnection does not make contributions
within this precision, either. The rest of the corrections together with the
leading-order contribution provide the gauge-invariant description of the
processes.
|
[
{
"created": "Fri, 23 Feb 2001 09:40:01 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Nekrasov",
"M. L.",
""
]
] |
The processes $e^{+}e^{-} \to 4f(\gamma)$ mediated by W-pair (and single) production are considered in the framework of the modified perturbation theory, based on the expansion of probability in powers of the coupling constant instead of amplitude. A full set of one-loop corrections to cross-section, and two-loop corrections to self-energy of unstable particles are completely taken into consideration. It is shown that the manifestly non-factorizable corrections do not make contributions into the next-to-leading-order approximation. Moreover, the colour reconnection does not make contributions within this precision, either. The rest of the corrections together with the leading-order contribution provide the gauge-invariant description of the processes.
|
2011.08415
|
Hisakazu Minakata
|
Hisakazu Minakata
|
Neutrino amplitude decomposition in matter
|
An overall factor $\sin 2 \phi$ lacked in $P(\nu_{e} \rightarrow
\nu_{e})^{(1)}$ recovered
|
Phys. Rev. D 103, 053004 (2021)
|
10.1103/PhysRevD.103.053004
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Observation of the interference between the atmospheric-scale and solar-scale
oscillations is one of the challenging and tantalizing goals of the ongoing and
upcoming neutrino experiments. An inevitable first step required for such
analyses is to establish the way of how the oscillation $S$ matrix can be
decomposed into the atmospheric and solar waves, the procedure dubbed as the
amplitude decomposition. In this paper, with use of the perturbative framework
proposed by Denton et al. (DMP), we establish the prescription for amplitude
decomposition which covers the whole kinematical region of the terrestrial
neutrino experiments. We analyze the limits to the atmospheric- and
solar-resonance regions to argue that the dynamical two modes of the DMP
decomposition can be interpreted as the matter-dressed atmospheric and solar
oscillations. The expressions of the oscillation probability, which are
decomposed into the non-interference and interference terms, are derived for
all the relevant flavor oscillation channels. Through construction of the DMP
decomposition, we reveal the nature of $\psi$ ($\theta_{12}$ in matter)
symmetry as due to the $S$ matrix rephasing invariance. A new picture of the
DMP perturbation theory emerged, a unified perturbative framework for neutrino
oscillation in earth matter.
|
[
{
"created": "Tue, 17 Nov 2020 04:24:17 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Feb 2021 00:26:28 GMT",
"version": "v2"
},
{
"created": "Tue, 22 Jun 2021 03:13:39 GMT",
"version": "v3"
}
] |
2021-06-23
|
[
[
"Minakata",
"Hisakazu",
""
]
] |
Observation of the interference between the atmospheric-scale and solar-scale oscillations is one of the challenging and tantalizing goals of the ongoing and upcoming neutrino experiments. An inevitable first step required for such analyses is to establish the way of how the oscillation $S$ matrix can be decomposed into the atmospheric and solar waves, the procedure dubbed as the amplitude decomposition. In this paper, with use of the perturbative framework proposed by Denton et al. (DMP), we establish the prescription for amplitude decomposition which covers the whole kinematical region of the terrestrial neutrino experiments. We analyze the limits to the atmospheric- and solar-resonance regions to argue that the dynamical two modes of the DMP decomposition can be interpreted as the matter-dressed atmospheric and solar oscillations. The expressions of the oscillation probability, which are decomposed into the non-interference and interference terms, are derived for all the relevant flavor oscillation channels. Through construction of the DMP decomposition, we reveal the nature of $\psi$ ($\theta_{12}$ in matter) symmetry as due to the $S$ matrix rephasing invariance. A new picture of the DMP perturbation theory emerged, a unified perturbative framework for neutrino oscillation in earth matter.
|
0709.1107
|
Steven B. Giddings
|
Steven B. Giddings
|
High-energy black hole production
|
Talk at PASCOS 2007, to appear in the proceedings. v2: minor
improvements, added refs. v3: reference correction. 11 pages, latex
|
AIPConf.Proc.957:69-78,2007
|
10.1063/1.2823829
| null |
hep-ph gr-qc hep-th
| null |
Black hole production in high-energy collisions is briefly surveyed. Included
is a summary of recent developments and open problems relevant to collider
(LHC) production, as well as of some theoretical issues pointing towards
fundamental principles of quantum gravity.
|
[
{
"created": "Fri, 7 Sep 2007 16:05:13 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Sep 2007 22:19:06 GMT",
"version": "v2"
},
{
"created": "Fri, 5 Oct 2007 21:08:51 GMT",
"version": "v3"
}
] |
2008-11-26
|
[
[
"Giddings",
"Steven B.",
""
]
] |
Black hole production in high-energy collisions is briefly surveyed. Included is a summary of recent developments and open problems relevant to collider (LHC) production, as well as of some theoretical issues pointing towards fundamental principles of quantum gravity.
|
hep-ph/0509170
|
Markus Diehl
|
M. Diehl
|
On the distribution of partons in the transverse plane
|
4 pages, 2 figures. Talk given at the International Conference on QCD
and Hadronic Physics, Beijing, China, 2005
|
Int.J.Mod.Phys. A21 (2006) 938-941
|
10.1142/S0217751X06032368
|
DESY-05-159
|
hep-ph
| null |
Elastic nucleon form factors constrain the spatial distribution of quarks in
the impact parameter plane. A recent analysis found that the average impact
parameter of quarks strongly depends on their longitudinal momentum, and
obtained an estimate of the orbital angular momentum carried by valence quarks
in the proton.
|
[
{
"created": "Fri, 16 Sep 2005 13:34:38 GMT",
"version": "v1"
}
] |
2009-11-11
|
[
[
"Diehl",
"M.",
""
]
] |
Elastic nucleon form factors constrain the spatial distribution of quarks in the impact parameter plane. A recent analysis found that the average impact parameter of quarks strongly depends on their longitudinal momentum, and obtained an estimate of the orbital angular momentum carried by valence quarks in the proton.
|
1205.0011
|
Marco Farina
|
Marco Farina, Christophe Grojean, Ennio Salvioni
|
(Dys)Zphilia or a custodial breaking Higgs at the LHC
|
16 pages, 10 figures
| null |
10.1007/JHEP07(2012)012
|
CERN-PH-TH/2012-086
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Electroweak precision measurements established that custodial symmetry is
preserved to a good accuracy in the gauge sector after electroweak symmetry
breaking. However, recent LHC results might be interpreted as pointing towards
Higgs couplings that do not respect such symmetry. Motivated by this
possibility, we reconsider the presence of an explicitly custodial breaking
coupling in a generic Higgs parameterization. After briefly commenting on the
large UV sensitivity of the T parameter to such a coupling, we perform a fit to
results of Higgs searches at LHC and Tevatron, and find that the apparent
enhancement of the ZZ channel with respect to WW can be accommodated. Two
degenerate best-fit points are present, which we label `Zphilic' and
`dysZphilic' depending on the sign of the hZZ coupling. Finally we highlight
some measurements at future linear colliders that may remove such degeneracy.
|
[
{
"created": "Mon, 30 Apr 2012 20:00:04 GMT",
"version": "v1"
}
] |
2015-06-04
|
[
[
"Farina",
"Marco",
""
],
[
"Grojean",
"Christophe",
""
],
[
"Salvioni",
"Ennio",
""
]
] |
Electroweak precision measurements established that custodial symmetry is preserved to a good accuracy in the gauge sector after electroweak symmetry breaking. However, recent LHC results might be interpreted as pointing towards Higgs couplings that do not respect such symmetry. Motivated by this possibility, we reconsider the presence of an explicitly custodial breaking coupling in a generic Higgs parameterization. After briefly commenting on the large UV sensitivity of the T parameter to such a coupling, we perform a fit to results of Higgs searches at LHC and Tevatron, and find that the apparent enhancement of the ZZ channel with respect to WW can be accommodated. Two degenerate best-fit points are present, which we label `Zphilic' and `dysZphilic' depending on the sign of the hZZ coupling. Finally we highlight some measurements at future linear colliders that may remove such degeneracy.
|
1806.02489
|
Jacopo Ferretti
|
J. Ferretti and E. Santopinto
|
Threshold corrections of $\chi_{\rm c}(2P)$ and $\chi_{\rm b}(3P)$
states and $J/\psi \rho$ and $J/\psi \omega$ transitions of the $X(3872)$ in
a coupled-channel model
| null |
Phys. Lett. B 789, 550 (2019)
|
10.1016/j.physletb.2018.12.052
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We calculate the masses of $\chi_{\rm c}(2P)$ and $\chi_{\rm b}(3P)$ states
with threshold corrections in a coupled-channel model. Here, the meson
quarkonium core is augmented by higher Fock components due to pair-creation
effects. According to our results, we interpret the resonances characterized by
very small threshold corrections, like $\chi_{\rm b}(3P)$'s, as almost pure
quarkonia, and those states characterized by non-negligible threshold
corrections, like the $X(3872)$, as quarkonium cores plus meson-meson
components. We also study the $J/\psi \rho$ and $J/\psi \omega$ hidden-flavor
strong decays of the $X(3872)$. The decays are calculated as the dissociation
of one of these components ($D^0 \bar D^{0*}$) into a $c \bar c$ state
($J/\psi$) plus a light meson ($\rho$ or $\omega$) in a potential model. In
particular, our result for the ratio between the $X(3872) \rightarrow J/\psi
\omega$ and $J/\psi \rho$ widths (0.6) is compatible with the present
experimental data ($0.8\pm0.3$) within the experimental error.
|
[
{
"created": "Thu, 7 Jun 2018 02:11:50 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Jun 2018 12:40:50 GMT",
"version": "v2"
},
{
"created": "Thu, 21 Jun 2018 16:56:03 GMT",
"version": "v3"
},
{
"created": "Mon, 8 Oct 2018 21:22:47 GMT",
"version": "v4"
},
{
"created": "Sun, 23 Dec 2018 15:44:08 GMT",
"version": "v5"
},
{
"created": "Sat, 19 Jan 2019 15:53:37 GMT",
"version": "v6"
}
] |
2019-01-23
|
[
[
"Ferretti",
"J.",
""
],
[
"Santopinto",
"E.",
""
]
] |
We calculate the masses of $\chi_{\rm c}(2P)$ and $\chi_{\rm b}(3P)$ states with threshold corrections in a coupled-channel model. Here, the meson quarkonium core is augmented by higher Fock components due to pair-creation effects. According to our results, we interpret the resonances characterized by very small threshold corrections, like $\chi_{\rm b}(3P)$'s, as almost pure quarkonia, and those states characterized by non-negligible threshold corrections, like the $X(3872)$, as quarkonium cores plus meson-meson components. We also study the $J/\psi \rho$ and $J/\psi \omega$ hidden-flavor strong decays of the $X(3872)$. The decays are calculated as the dissociation of one of these components ($D^0 \bar D^{0*}$) into a $c \bar c$ state ($J/\psi$) plus a light meson ($\rho$ or $\omega$) in a potential model. In particular, our result for the ratio between the $X(3872) \rightarrow J/\psi \omega$ and $J/\psi \rho$ widths (0.6) is compatible with the present experimental data ($0.8\pm0.3$) within the experimental error.
|
1712.06784
|
Toshihiko Ota
|
Toshihiko Ota
|
Beyond Standard Neutrino Theory
|
Proceedings of the 19th International Workshop on Neutrinos from
Accelerators (NUFACT 2017). Comments, corrections, and suggestions on
references are welcome
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this talk, we will discuss phenomenology of new physics associated with
neutrinos, in particular, non-standard neutrino interactions, non-unitarity of
the lepton mixing matrix, and secret neutrino interactions mediated by a light
field.
|
[
{
"created": "Tue, 19 Dec 2017 05:15:30 GMT",
"version": "v1"
}
] |
2017-12-20
|
[
[
"Ota",
"Toshihiko",
""
]
] |
In this talk, we will discuss phenomenology of new physics associated with neutrinos, in particular, non-standard neutrino interactions, non-unitarity of the lepton mixing matrix, and secret neutrino interactions mediated by a light field.
|
hep-ph/0105066
|
Ian Low
|
Adam K. Leibovich, Ian Low, and I. Z. Rothstein
|
A Comment on the Extractions of V_{ub} from Radiative Decays
|
10 pages, 3 figures; one figure added, one reference added, expanded
discussions
|
Phys.Lett.B513:83-87,2001
|
10.1016/S0370-2693(01)00667-0
| null |
hep-ph hep-ex
| null |
We present a model independent closed form expression for |V_{ub}|^2/|V_{tb}
V_{ts}^*|^2, which includes the resummation of large endpoint logarithms as
well as the interference effects from the operators $O_2$ and $O_8$. We
demonstrate that the method to extract |V_{ub}| presented by the authors in
hep-ph/9909404, and modified in this letter to include interference effects, is
not just a refinement of the method introduced in hep-ph/9312311. We also
discuss the model dependence of the latter proposal. Furthermore, we show that
the resummation is not negligible and that the Landau pole does not introduce
any significant uncertainties.
|
[
{
"created": "Mon, 7 May 2001 21:56:38 GMT",
"version": "v1"
},
{
"created": "Thu, 10 May 2001 20:20:25 GMT",
"version": "v2"
}
] |
2014-11-17
|
[
[
"Leibovich",
"Adam K.",
""
],
[
"Low",
"Ian",
""
],
[
"Rothstein",
"I. Z.",
""
]
] |
We present a model independent closed form expression for |V_{ub}|^2/|V_{tb} V_{ts}^*|^2, which includes the resummation of large endpoint logarithms as well as the interference effects from the operators $O_2$ and $O_8$. We demonstrate that the method to extract |V_{ub}| presented by the authors in hep-ph/9909404, and modified in this letter to include interference effects, is not just a refinement of the method introduced in hep-ph/9312311. We also discuss the model dependence of the latter proposal. Furthermore, we show that the resummation is not negligible and that the Landau pole does not introduce any significant uncertainties.
|
hep-ph/0501007
|
Tomo Takahashi
|
Takeo Moroi, Tomo Takahashi and Yoshikazu Toyoda
|
Relaxing Constraints on Inflation Models with Curvaton
|
18 pages, 6 figures
|
Phys.Rev. D72 (2005) 023502
|
10.1103/PhysRevD.72.023502
| null |
hep-ph astro-ph
| null |
We consider the effects of the curvaton, late-decaying scalar condensation,
to observational constraints on inflation models. From current observations of
cosmic density fluctuations, severe constraints on some class of inflation
models are obtained, in particular, on the chaotic inflation with higher-power
monomials, the natural inflation, and the new inflation. We study how the
curvaton scenario changes (and relaxes) the constraints on these models.
|
[
{
"created": "Mon, 3 Jan 2005 08:22:12 GMT",
"version": "v1"
}
] |
2009-11-11
|
[
[
"Moroi",
"Takeo",
""
],
[
"Takahashi",
"Tomo",
""
],
[
"Toyoda",
"Yoshikazu",
""
]
] |
We consider the effects of the curvaton, late-decaying scalar condensation, to observational constraints on inflation models. From current observations of cosmic density fluctuations, severe constraints on some class of inflation models are obtained, in particular, on the chaotic inflation with higher-power monomials, the natural inflation, and the new inflation. We study how the curvaton scenario changes (and relaxes) the constraints on these models.
|
hep-ph/0203133
|
Szabolcs Borsanyi
|
Sz. Borsanyi, A. Patkos, D. Sexty
|
Goldstone excitations from spinodal instability
|
10 Latex pages, 8 Figures, version accepted for publication in PRD
|
Phys.Rev. D66 (2002) 025014
|
10.1103/PhysRevD.66.025014
| null |
hep-ph
| null |
The squared mass of a complex scalar field is turned dynamically into
negative by its O(2)-invariant coupling to a real field slowly rolling down in
a quadratic potential. The emergence of gapless excitations is studied in real
time simulations after spinodal instability occurs. Careful tests demonstrate
that the Goldstone modes appear almost instantly after the symmetry breaking is
over, much before thermal equilibrium is established.
|
[
{
"created": "Thu, 14 Mar 2002 13:19:54 GMT",
"version": "v1"
},
{
"created": "Sun, 12 May 2002 21:03:56 GMT",
"version": "v2"
}
] |
2009-11-07
|
[
[
"Borsanyi",
"Sz.",
""
],
[
"Patkos",
"A.",
""
],
[
"Sexty",
"D.",
""
]
] |
The squared mass of a complex scalar field is turned dynamically into negative by its O(2)-invariant coupling to a real field slowly rolling down in a quadratic potential. The emergence of gapless excitations is studied in real time simulations after spinodal instability occurs. Careful tests demonstrate that the Goldstone modes appear almost instantly after the symmetry breaking is over, much before thermal equilibrium is established.
|
hep-ph/9702242
|
Willy van Neerven
|
M.Buza, W.L.van Neerven
|
Order \alpha_s^2 Contributions to charm production in charged-current
deep-inelastic lepton-hadron scattering
|
45 pages LaTeX, 17 Postscript Figures
|
Nucl.Phys. B500 (1997) 301-324
|
10.1016/S0550-3213(97)00327-1
| null |
hep-ph
| null |
The most important part of the order $\alpha_s^2$ corrections to the charm
component of the charged-current structure functions $F_2(x,Q^2)$ and
$F_3(x,Q^2)$ have been calculated. This calculation is based on the asymptotic
form of the heavy-quark coefficient functions corresponding to the higher order
corrections to the W-boson-gluon fusion process. These coefficient functions
which are in principle only valid for $Q^2 \gg m^2$ can be also used to
estimate the order $\alpha_s^2$ contributions at lower $Q^2$ values provided $x
< 0.1$. It turns out that the above corrections are appreciable in the large
$Q^2$-region and they explain the discrepancy found for the structure functions
between the fixed-flavour scheme (FFS) and the variable-flavour-number scheme
(VFNS). These corrections also hamper the extraction of the strange-quark
density from the data obtained for the charged-current and the
electromagnetic-current processes.
|
[
{
"created": "Tue, 4 Feb 1997 10:49:23 GMT",
"version": "v1"
}
] |
2009-10-30
|
[
[
"Buza",
"M.",
""
],
[
"van Neerven",
"W. L.",
""
]
] |
The most important part of the order $\alpha_s^2$ corrections to the charm component of the charged-current structure functions $F_2(x,Q^2)$ and $F_3(x,Q^2)$ have been calculated. This calculation is based on the asymptotic form of the heavy-quark coefficient functions corresponding to the higher order corrections to the W-boson-gluon fusion process. These coefficient functions which are in principle only valid for $Q^2 \gg m^2$ can be also used to estimate the order $\alpha_s^2$ contributions at lower $Q^2$ values provided $x < 0.1$. It turns out that the above corrections are appreciable in the large $Q^2$-region and they explain the discrepancy found for the structure functions between the fixed-flavour scheme (FFS) and the variable-flavour-number scheme (VFNS). These corrections also hamper the extraction of the strange-quark density from the data obtained for the charged-current and the electromagnetic-current processes.
|
1312.1363
|
Itay Yavin
|
Maxim Pospelov, Neal Weiner, and Itay Yavin
|
Dark matter detection in two easy steps
|
14 pages, 14 figures
|
Phys. Rev. D 89, 055008 (2014)
|
10.1103/PhysRevD.89.055008
| null |
hep-ph astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Multi-component dark matter particles may have a more intricate direct
detection signal than simple elastic scattering on nuclei. In a broad class of
well-motivated models the inelastic excitation of dark matter particles is
followed by de-excitation via $\gamma$-decay. In experiments with fine energy
resolution, such as many $0\nu 2\beta$ decay experiments, this motivates a
highly model-independent search for the sidereal daily modulation of an
unexpected $\gamma$ line. Such a signal arises from two-step WIMP interaction:
the WIMP is first excited in the lead shielding and subsequently decays back to
the ground state via the emission of a monochromatic $\gamma$ within the
detector volume. We explore this idea in detail by considering the model of
magnetic inelastic WIMPs, and take a sequence of CUORE-type detectors as an
example. We find that under reasonable assumptions about detector performance
it is possible to efficiently explore mass splittings of up to few hundreds of
keV for a WIMP of weak-scale mass and transitional magnetic moments. The
modulation can be cheaply and easily enhanced by the presence of additional
asymmetric lead shielding. We devise a toy simulation to show that a specially
designed asymmetric shielding may result in up to $30\%$ diurnal modulations of
the two-step WIMP signal, leading to additional strong gains in sensitivity.
|
[
{
"created": "Wed, 4 Dec 2013 21:34:03 GMT",
"version": "v1"
}
] |
2014-03-19
|
[
[
"Pospelov",
"Maxim",
""
],
[
"Weiner",
"Neal",
""
],
[
"Yavin",
"Itay",
""
]
] |
Multi-component dark matter particles may have a more intricate direct detection signal than simple elastic scattering on nuclei. In a broad class of well-motivated models the inelastic excitation of dark matter particles is followed by de-excitation via $\gamma$-decay. In experiments with fine energy resolution, such as many $0\nu 2\beta$ decay experiments, this motivates a highly model-independent search for the sidereal daily modulation of an unexpected $\gamma$ line. Such a signal arises from two-step WIMP interaction: the WIMP is first excited in the lead shielding and subsequently decays back to the ground state via the emission of a monochromatic $\gamma$ within the detector volume. We explore this idea in detail by considering the model of magnetic inelastic WIMPs, and take a sequence of CUORE-type detectors as an example. We find that under reasonable assumptions about detector performance it is possible to efficiently explore mass splittings of up to few hundreds of keV for a WIMP of weak-scale mass and transitional magnetic moments. The modulation can be cheaply and easily enhanced by the presence of additional asymmetric lead shielding. We devise a toy simulation to show that a specially designed asymmetric shielding may result in up to $30\%$ diurnal modulations of the two-step WIMP signal, leading to additional strong gains in sensitivity.
|
1903.08137
|
Gudrun Heinrich
|
G.Heinrich, S.P.Jones, M.Kerner, G.Luisoni, L.Scyboz
|
Probing the trilinear Higgs boson coupling in di-Higgs production at NLO
QCD including parton shower effects
|
20 pages, 7 figures; v2: matches published version
|
J. High Energ. Phys. (2019) 66
|
10.1007/JHEP06(2019)066
|
CERN-TH-2019-028, MPP-2019-50, ZU-TH-09/19
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present results for Higgs boson pair production with variations of the
trilinear Higgs boson self-coupling at next-to-leading order (NLO) in QCD
including the full top quark mass dependence. Differential results at 14 TeV
are presented, and we discuss the implications of anomalous trilinear couplings
as well as differences between the PYTHIA 8.2 and HERWIG 7.1 parton showers in
combination with POWHEG. The implementation of the NLO QCD calculation with
variable Higgs boson self-coupling is made publicly available in the
POWHEG-BOX-V2 Monte Carlo framework. A simple method for using the new
implementation to study also variations of the top quark Yukawa coupling is
described.
|
[
{
"created": "Tue, 19 Mar 2019 17:48:02 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Jun 2019 17:28:52 GMT",
"version": "v2"
}
] |
2019-06-25
|
[
[
"Heinrich",
"G.",
""
],
[
"Jones",
"S. P.",
""
],
[
"Kerner",
"M.",
""
],
[
"Luisoni",
"G.",
""
],
[
"Scyboz",
"L.",
""
]
] |
We present results for Higgs boson pair production with variations of the trilinear Higgs boson self-coupling at next-to-leading order (NLO) in QCD including the full top quark mass dependence. Differential results at 14 TeV are presented, and we discuss the implications of anomalous trilinear couplings as well as differences between the PYTHIA 8.2 and HERWIG 7.1 parton showers in combination with POWHEG. The implementation of the NLO QCD calculation with variable Higgs boson self-coupling is made publicly available in the POWHEG-BOX-V2 Monte Carlo framework. A simple method for using the new implementation to study also variations of the top quark Yukawa coupling is described.
|
1611.05017
|
Mohammadreza Zakeri
|
Corey Kownacki, Ernest Ma, Nicholas Pollard, and Mohammadreza Zakeri
|
Generalized Gauge U(1) Family Symmetry for Quarks and Leptons
|
13 pages
| null |
10.1016/j.physletb.2017.01.013
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
If the standard model of quarks and leptons is extended to include three
singlet right-handed neutrinos, then the resulting fermion structure admits an
infinite number of anomaly-free solutions with just one simple constraint.
Well-known examples satisfying this constraint are $B-L$, $L_{\mu}-L_{\tau}$ ,
$B-3L_{\tau}$ , etc. We derive this simple constraint, and discuss two new
examples which offer some insights to the structure of mixing among quark and
lepton families, together with their possible verification at the Large Hadron
Collider.
|
[
{
"created": "Tue, 15 Nov 2016 20:25:45 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Nov 2016 19:41:25 GMT",
"version": "v2"
}
] |
2017-01-18
|
[
[
"Kownacki",
"Corey",
""
],
[
"Ma",
"Ernest",
""
],
[
"Pollard",
"Nicholas",
""
],
[
"Zakeri",
"Mohammadreza",
""
]
] |
If the standard model of quarks and leptons is extended to include three singlet right-handed neutrinos, then the resulting fermion structure admits an infinite number of anomaly-free solutions with just one simple constraint. Well-known examples satisfying this constraint are $B-L$, $L_{\mu}-L_{\tau}$ , $B-3L_{\tau}$ , etc. We derive this simple constraint, and discuss two new examples which offer some insights to the structure of mixing among quark and lepton families, together with their possible verification at the Large Hadron Collider.
|
1110.1330
|
John W. Moffat
|
J. W. Moffat
|
Bimetric Relativity and the Opera Neutrino Experiment
|
6 pages, 1 figure, typo corrected. Minor corrections
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the possibility of explaining the propagation of neutrinos
measured by the OPERA experiment with $\delta v_\nu=(v_\nu-c_0)/c_0$, where
$c_0$ is the speed of light in vacuum, using a bimetric relativity model. The
geometry of the bimetric model has two metrics in spacetime. One metric
$g_{\mu\nu}$ possesses a null cone along which massless gravitons and photons
travel with the constant speed $c_0$, while the other `matter' metric ${\hat
g}_{\mu\nu}=g_{\mu\nu}+\beta\psi_\mu\psi_\nu$ has a null cone with a bigger
speed $c > c_0$ with $0 < \delta v_\nu\ll c/c_0$. This second cone structure of
spacetime prevents the neutrinos from being superluminal tachyons $v_\nu < c$.
Such superluminal neutrinos would lead to severe depletion of neutrino energy,
refuting the OPERA result. The charge-current source of the background gauge
field $\psi_\mu$ is assumed to be baryon charge and the strength of the field
$\psi_\mu$ is distance dependent, explaining the observation that for supernova
SN1987a $v_\nu\simeq c_0$. Altering the path of the neutrinos through the earth
or performing a space experiment can test the OPERA neutrino experimental
result.
|
[
{
"created": "Thu, 6 Oct 2011 17:30:38 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Oct 2011 19:36:39 GMT",
"version": "v2"
},
{
"created": "Wed, 12 Oct 2011 18:57:40 GMT",
"version": "v3"
}
] |
2011-10-13
|
[
[
"Moffat",
"J. W.",
""
]
] |
We investigate the possibility of explaining the propagation of neutrinos measured by the OPERA experiment with $\delta v_\nu=(v_\nu-c_0)/c_0$, where $c_0$ is the speed of light in vacuum, using a bimetric relativity model. The geometry of the bimetric model has two metrics in spacetime. One metric $g_{\mu\nu}$ possesses a null cone along which massless gravitons and photons travel with the constant speed $c_0$, while the other `matter' metric ${\hat g}_{\mu\nu}=g_{\mu\nu}+\beta\psi_\mu\psi_\nu$ has a null cone with a bigger speed $c > c_0$ with $0 < \delta v_\nu\ll c/c_0$. This second cone structure of spacetime prevents the neutrinos from being superluminal tachyons $v_\nu < c$. Such superluminal neutrinos would lead to severe depletion of neutrino energy, refuting the OPERA result. The charge-current source of the background gauge field $\psi_\mu$ is assumed to be baryon charge and the strength of the field $\psi_\mu$ is distance dependent, explaining the observation that for supernova SN1987a $v_\nu\simeq c_0$. Altering the path of the neutrinos through the earth or performing a space experiment can test the OPERA neutrino experimental result.
|
1510.07319
|
Andrew Fowlie Dr.
|
Andrew Fowlie
|
LHCO_reader: A new code for reading and analyzing detector-level events
stored in LHCO format
|
28 pages, new features of code described, including alpha_T, razor
and mT2
| null | null |
CoEPP-MN-15-10
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a new Python module - LHCO_reader - for reading detector-level
events in LHCO format generated from detector-simulators such as PGS and
Delphes. Emphasis is placed upon ease of use. The module is installed via pip.
Once installed, one can read and scrutinize events, with helpful functions and
classes for cutting, plotting and inspecting events, and manipulating
four-momenta by e.g. boosting. Implementing complicated analyses should be
straight-forward by coding any cuts into Python. Furthermore, common kinematic
variables, including $\alpha_T$ and razor are included out of the box, and
$m_{T2}$ and $m_{T2}^W$ are provided by interfaces with external libraries.
|
[
{
"created": "Sun, 25 Oct 2015 22:52:41 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Feb 2016 23:50:20 GMT",
"version": "v2"
}
] |
2016-02-25
|
[
[
"Fowlie",
"Andrew",
""
]
] |
We present a new Python module - LHCO_reader - for reading detector-level events in LHCO format generated from detector-simulators such as PGS and Delphes. Emphasis is placed upon ease of use. The module is installed via pip. Once installed, one can read and scrutinize events, with helpful functions and classes for cutting, plotting and inspecting events, and manipulating four-momenta by e.g. boosting. Implementing complicated analyses should be straight-forward by coding any cuts into Python. Furthermore, common kinematic variables, including $\alpha_T$ and razor are included out of the box, and $m_{T2}$ and $m_{T2}^W$ are provided by interfaces with external libraries.
|
1505.00550
|
Alka Upadhyay
|
A. Upadhyay, M. Batra
|
Importance of Non-Perturbative QCD Parameters for Bottom Mesons
|
Volume 2014 (2014), Article ID 619783, 4 pages, Advances in High
Energy Physics, 2014. arXiv admin note: text overlap with arXiv:1312.5406
|
Advances in High Energy Physics, 2014,Volume 2014, Article ID
619783, 4 pages
|
10.1155/2014/619783
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The importance of non-perturbative Quantum Chromodynamics [QCD] parameters is
discussed in context to the predicting power for bottom meson masses and
isospin splitting. In the framework of heavy quark effective theory, the work
presented here focuses on the different allowed values of the two non
perturbative QCD parameters used in heavy quark effective theory formula and
using the best fitted parameter, masses of the excited bottom meson states in
JP=(1/2)+ doublet in strange as well as non-strange sector are calculated here.
The calculated masses are found to be matching well with experiments and other
phenomenological models. The mass and hyperfine splitting has also been
analyzed for both strange and non-strange heavy mesons with respect to spin and
flavor symmetries.
|
[
{
"created": "Mon, 4 May 2015 08:20:04 GMT",
"version": "v1"
}
] |
2016-05-13
|
[
[
"Upadhyay",
"A.",
""
],
[
"Batra",
"M.",
""
]
] |
The importance of non-perturbative Quantum Chromodynamics [QCD] parameters is discussed in context to the predicting power for bottom meson masses and isospin splitting. In the framework of heavy quark effective theory, the work presented here focuses on the different allowed values of the two non perturbative QCD parameters used in heavy quark effective theory formula and using the best fitted parameter, masses of the excited bottom meson states in JP=(1/2)+ doublet in strange as well as non-strange sector are calculated here. The calculated masses are found to be matching well with experiments and other phenomenological models. The mass and hyperfine splitting has also been analyzed for both strange and non-strange heavy mesons with respect to spin and flavor symmetries.
|
hep-ph/9211309
|
Mariano Quiros
|
I. Antoniadis, C. Mu\~noz and M. Quir\'os
|
Dynamical supersymmetry breaking with a large internal dimension
|
27 pages, latex, 6 figures available by FAX upon request
|
Nucl.Phys. B397 (1993) 515-538
|
10.1016/0550-3213(93)90184-Q
|
CPTH-A206.1192, FTUAM 92/35, IEM-FT-63/92
|
hep-ph hep-th
| null |
Supersymmetry breaking in string perturbation theory predicts the existence
of a new dimension at the TeV scale. The simplest realization of the minimal
supersymmetric Standard Model in the context of this mechanism has two
important consequences: (i) A natural solution to the $\mu$-problem; (ii) The
absence of quadratic divergences in the cosmological constant, which leads to a
dynamical determination of the supersymmetry breaking and electroweak scale. We
present an explicit example in which the whole particle spectrum is given as a
function of the top quark mass. A generic prediction of this mechanism is the
existence of Kaluza-Klein excitations for gauge bosons and higgses. In
particular the first excitation of the photon could be accessible to future
accelerators and give a clear signal of the proposed mechanism.
|
[
{
"created": "Wed, 25 Nov 1992 17:24:54 GMT",
"version": "v1"
}
] |
2009-10-22
|
[
[
"Antoniadis",
"I.",
""
],
[
"Muñoz",
"C.",
""
],
[
"Quirós",
"M.",
""
]
] |
Supersymmetry breaking in string perturbation theory predicts the existence of a new dimension at the TeV scale. The simplest realization of the minimal supersymmetric Standard Model in the context of this mechanism has two important consequences: (i) A natural solution to the $\mu$-problem; (ii) The absence of quadratic divergences in the cosmological constant, which leads to a dynamical determination of the supersymmetry breaking and electroweak scale. We present an explicit example in which the whole particle spectrum is given as a function of the top quark mass. A generic prediction of this mechanism is the existence of Kaluza-Klein excitations for gauge bosons and higgses. In particular the first excitation of the photon could be accessible to future accelerators and give a clear signal of the proposed mechanism.
|
2112.10337
|
Atsushi Hinata
|
A. Hinata
|
Seesaw mechanism in the R-parity violating supersymmetric standard model
with the gauged flavor $\mathrm{U}(1)_X$ symmetry
|
36 pages, 2 figures. Updated to the revised version with added the
phenomenological discussion and figures
| null | null |
WU-HEP-21-06
|
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We study the seesaw mechanism in the supersymmetric standard model (SSM) with
${\mathbb Z}_3$ symmetry instead of the R-parity, so-called {\it Matter
triality} ($M_3$). This Abelian discrete symmetry prohibits the baryon/lepton
number violation operators at the non-renormalizable level, and the proton
longevity is ensured. The lepton number violation term by the right-handed
neutrino is only allowed under the symmetry, it plays a role of the Majorana
mass after the right-handed sneutrino develops into the vacuum expectation
value. The mass of the active neutrino is generated from the two contributions
from the right-handed neutrino and the neutralino due to the R-parity
violation. In this paper, we realize the neutrino mass and mixing angle in the
SSM with matter triality which is embedded into the gauged flavor
${\mathrm{U}}(1)_X$ symmetry. In addition to the flavor ansatz, we derive the
charge assignment to satisfy the anomaly cancellation conditions. Then, the
model could predict the sterile neutrino with the mass below the soft SUSY
breaking mass scale, and its mass and mixing angle are restricted by the search
for the heavy neutral leptons.
|
[
{
"created": "Mon, 20 Dec 2021 04:54:10 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Mar 2022 04:08:03 GMT",
"version": "v2"
}
] |
2022-03-30
|
[
[
"Hinata",
"A.",
""
]
] |
We study the seesaw mechanism in the supersymmetric standard model (SSM) with ${\mathbb Z}_3$ symmetry instead of the R-parity, so-called {\it Matter triality} ($M_3$). This Abelian discrete symmetry prohibits the baryon/lepton number violation operators at the non-renormalizable level, and the proton longevity is ensured. The lepton number violation term by the right-handed neutrino is only allowed under the symmetry, it plays a role of the Majorana mass after the right-handed sneutrino develops into the vacuum expectation value. The mass of the active neutrino is generated from the two contributions from the right-handed neutrino and the neutralino due to the R-parity violation. In this paper, we realize the neutrino mass and mixing angle in the SSM with matter triality which is embedded into the gauged flavor ${\mathrm{U}}(1)_X$ symmetry. In addition to the flavor ansatz, we derive the charge assignment to satisfy the anomaly cancellation conditions. Then, the model could predict the sterile neutrino with the mass below the soft SUSY breaking mass scale, and its mass and mixing angle are restricted by the search for the heavy neutral leptons.
|
hep-ph/0105001
|
Masahide Yamaguchi
|
Masahide Yamaguchi
|
Density Fluctuations and Primordial Black Hole Formation in Natural
Double Inflation in Supergravity
|
21 pages, 2 figures, to appear in Phys. Rev. D
|
Phys.Rev. D64 (2001) 063503
|
10.1103/PhysRevD.64.063503
| null |
hep-ph astro-ph
| null |
We investigate the recently proposed natural double inflation model in
supergravity. Chaotic inflation first takes place by virtue of the
Nambu-Goldstone-like shift symmetry. During chaotic inflation, an initial value
of second inflation (new inflation) is set, which is adequately far from the
local maximum of the potential due to the small linear term in the K\"ahler
potential. Then, primordial fluctuations within the present horizon scale may
be produced during both inflations. Primordial fluctuations responsible for
anisotropies of the cosmic microwave background radiation and the large scale
structure are produced during chaotic inflation, while fluctuations on smaller
scales are produced during new inflation. Because of the peculiar nature of new
inflation, they can become as large as $10^{-1}$-$10^{-2}$, which may lead to
the formation of primordial black holes.
|
[
{
"created": "Tue, 1 May 2001 03:15:09 GMT",
"version": "v1"
},
{
"created": "Fri, 13 Jul 2001 05:34:33 GMT",
"version": "v2"
}
] |
2009-11-07
|
[
[
"Yamaguchi",
"Masahide",
""
]
] |
We investigate the recently proposed natural double inflation model in supergravity. Chaotic inflation first takes place by virtue of the Nambu-Goldstone-like shift symmetry. During chaotic inflation, an initial value of second inflation (new inflation) is set, which is adequately far from the local maximum of the potential due to the small linear term in the K\"ahler potential. Then, primordial fluctuations within the present horizon scale may be produced during both inflations. Primordial fluctuations responsible for anisotropies of the cosmic microwave background radiation and the large scale structure are produced during chaotic inflation, while fluctuations on smaller scales are produced during new inflation. Because of the peculiar nature of new inflation, they can become as large as $10^{-1}$-$10^{-2}$, which may lead to the formation of primordial black holes.
|
hep-ph/0111447
|
A. I. Milstein
|
R.N.Lee, A.L.Maslennikov, A.I.Milstein, V.M.Strakhovenko, and
Yu.A.Tikhonov
|
Photon splitting in atomic fields
|
45 pages, 24 figures
|
Phys.Rept.373:213,2003
|
10.1016/S0370-1573(02)00030-3
| null |
hep-ph
| null |
Photon splitting due to vacuum polarization in the electric field of an atom
is considered. We survey different theoretical approaches to the description of
this nonlinear QED process and several attempts of its experimental
observation. We present the results of the lowest-order perturbation theory as
well as those obtained within the quasiclassical approximation being exact in
the external field strength. The experiment where photon splitting was really
observed for the first time is discussed in details. The results of this
experiment are compared with recent theoretical estimations.
|
[
{
"created": "Fri, 30 Nov 2001 06:20:27 GMT",
"version": "v1"
}
] |
2009-11-07
|
[
[
"Lee",
"R. N.",
""
],
[
"Maslennikov",
"A. L.",
""
],
[
"Milstein",
"A. I.",
""
],
[
"Strakhovenko",
"V. M.",
""
],
[
"Tikhonov",
"Yu. A.",
""
]
] |
Photon splitting due to vacuum polarization in the electric field of an atom is considered. We survey different theoretical approaches to the description of this nonlinear QED process and several attempts of its experimental observation. We present the results of the lowest-order perturbation theory as well as those obtained within the quasiclassical approximation being exact in the external field strength. The experiment where photon splitting was really observed for the first time is discussed in details. The results of this experiment are compared with recent theoretical estimations.
|
2408.01488
|
Sudip Jana
|
Sudip Jana, Lucas Puetter, Alexei Yu. Smirnov
|
Restricting Sterile Neutrinos by Neutrinoless Double Beta Decay
|
6 pages + references, 4 figures
| null | null | null |
hep-ph hep-ex nucl-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The bounds on parameters of the eV and higher scale sterile neutrinos from
the $0\nu \beta \beta$ decay have been refined and updated. We present a simple
and compact analytic expression for the bound in the $\Delta m^2_{41} - \sin^2
2\theta_{14}$ plane, which includes all relevant parameters. Dependencies of
the bound on unknown CP-phases and the type of mass spectrum of light neutrinos
(mass ordering and level of degeneracy) are studied in detail. We have computed
the bounds using the latest and most stringent data from KamLAND-Zen. The
projected constraints from future experiments are estimated. The obtained
bounds are confronted with positive indications of the presence of sterile
neutrinos as well as with the other existing bounds. The $0\nu \beta \beta$
decay results exclude the regions of parameters implied by BEST and Neutrino-4,
and the regions indicated by LSND and MiniBooNE are in conflict with $0\nu
\beta \beta$ results combined with $\nu_\mu-$ disappearance bounds.
|
[
{
"created": "Fri, 2 Aug 2024 18:00:00 GMT",
"version": "v1"
}
] |
2024-08-07
|
[
[
"Jana",
"Sudip",
""
],
[
"Puetter",
"Lucas",
""
],
[
"Smirnov",
"Alexei Yu.",
""
]
] |
The bounds on parameters of the eV and higher scale sterile neutrinos from the $0\nu \beta \beta$ decay have been refined and updated. We present a simple and compact analytic expression for the bound in the $\Delta m^2_{41} - \sin^2 2\theta_{14}$ plane, which includes all relevant parameters. Dependencies of the bound on unknown CP-phases and the type of mass spectrum of light neutrinos (mass ordering and level of degeneracy) are studied in detail. We have computed the bounds using the latest and most stringent data from KamLAND-Zen. The projected constraints from future experiments are estimated. The obtained bounds are confronted with positive indications of the presence of sterile neutrinos as well as with the other existing bounds. The $0\nu \beta \beta$ decay results exclude the regions of parameters implied by BEST and Neutrino-4, and the regions indicated by LSND and MiniBooNE are in conflict with $0\nu \beta \beta$ results combined with $\nu_\mu-$ disappearance bounds.
|
1702.01189
|
Richard Hill
|
Richard J. Hill
|
Review of experimental and theoretical status of the proton radius
puzzle
|
22 pages, 14 figures, invited plenary talk presented at XII Quark
Confinement and the Hadron Spectrum, Thessaloniki, 2016
| null |
10.1051/epjconf/201713701023
| null |
hep-ph nucl-th physics.atom-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The discrepancy between the measured Lamb shift in muonic hydrogen and
expectations from electron-proton scattering and regular hydrogen spectroscopy
has become known as the proton radius puzzle, whose most "mundane" resolution
requires a $> 5 \sigma$ shift in the value of the fundamental Rydberg constant.
I briefly review the status of spectroscopic and scattering measurements,
recent theoretical developments, and implications for fundamental physics.
|
[
{
"created": "Fri, 3 Feb 2017 22:13:51 GMT",
"version": "v1"
}
] |
2017-04-05
|
[
[
"Hill",
"Richard J.",
""
]
] |
The discrepancy between the measured Lamb shift in muonic hydrogen and expectations from electron-proton scattering and regular hydrogen spectroscopy has become known as the proton radius puzzle, whose most "mundane" resolution requires a $> 5 \sigma$ shift in the value of the fundamental Rydberg constant. I briefly review the status of spectroscopic and scattering measurements, recent theoretical developments, and implications for fundamental physics.
|
hep-ph/0012160
|
Richard F. Lebed
|
Xiangdong Ji and Richard F. Lebed
|
Counting Form Factors of Twist-Two Operators
|
7 pages, LaTeX (revtex)
|
Phys.Rev. D63 (2001) 076005
|
10.1103/PhysRevD.63.076005
|
UMD PP#01-030, DOE/ER/40762-216
|
hep-ph nucl-th
| null |
We present a simple method to count the number of hadronic form factors based
on the partial wave formalism and crossing symmetry. In particular, we show
that the number of independent nucleon form factors of spin-n, twist-2
operators (the vector current and energy-momentum tensor being special
examples) is n+1. These generalized form factors define the generalized
(off-forward) parton distributions that have been studied extensively in the
recent literature. In proving this result, we also show how the J^{PC} rules
for onium states arise in the helicity formalism.
|
[
{
"created": "Wed, 13 Dec 2000 20:57:32 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Ji",
"Xiangdong",
""
],
[
"Lebed",
"Richard F.",
""
]
] |
We present a simple method to count the number of hadronic form factors based on the partial wave formalism and crossing symmetry. In particular, we show that the number of independent nucleon form factors of spin-n, twist-2 operators (the vector current and energy-momentum tensor being special examples) is n+1. These generalized form factors define the generalized (off-forward) parton distributions that have been studied extensively in the recent literature. In proving this result, we also show how the J^{PC} rules for onium states arise in the helicity formalism.
|
1507.01130
|
Yazid Delenda
|
Yazid Delenda, Kamel Khelifa-Kerfa
|
On the resummation of non-global logarithms at finite $\mathbf{N_c}$
|
To appear in the proceedings of the XXIII International Workshop on
Deep-Inelastic Scattering and Related Subjects, April 27 - May 1, 2015,
Dallas, Texas, USA
|
PoS(DIS2015)138
| null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a calculation of non-global logs at finite $\mathrm{N_c}$ for the
hemisphere mass distribution in $e^+e^-\to 2$ jets at single log accuracy up to
fifth order in the strong coupling constant. Our results suggest a possible
all-orders resummation of these large logs into an exponential. Comparing our
results to those at large $\mathrm{N_c}$, recently reported in literature, we
find an agreement. We additionally compare our findings with the numerical
all-orders resummation at large $\mathrm{N_c}$ and discuss the significance of
neglected finite-$\mathrm{N_c}$ corrections on the said distribution.
|
[
{
"created": "Sat, 4 Jul 2015 17:33:59 GMT",
"version": "v1"
}
] |
2015-07-07
|
[
[
"Delenda",
"Yazid",
""
],
[
"Khelifa-Kerfa",
"Kamel",
""
]
] |
We present a calculation of non-global logs at finite $\mathrm{N_c}$ for the hemisphere mass distribution in $e^+e^-\to 2$ jets at single log accuracy up to fifth order in the strong coupling constant. Our results suggest a possible all-orders resummation of these large logs into an exponential. Comparing our results to those at large $\mathrm{N_c}$, recently reported in literature, we find an agreement. We additionally compare our findings with the numerical all-orders resummation at large $\mathrm{N_c}$ and discuss the significance of neglected finite-$\mathrm{N_c}$ corrections on the said distribution.
|
1411.7040
|
Pier Paolo Giardino
|
Giuseppe Degrassi, Paolo Gambino and Pier Paolo Giardino
|
The $m_{\scriptscriptstyle W}-m_{\scriptscriptstyle Z}$ interdependence
in the Standard Model: a new scrutiny
|
21 pages, 1 figure
| null | null |
RM3-TH/14-19
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The $m_{\scriptscriptstyle W}-m_{\scriptscriptstyle Z}$ interdependence in
the Standard Model is studied at $O(\alpha^2) $ in the $\overline{MS}$ scheme.
The relevant radiative parameters, $\Delta \hat{\alpha} (\mu),\, \Delta
\hat{r}_{W},\, \hat{\rho}$ are computed at the full two-loop level augmented by
higher-order QCD contributions and by resummation of reducible contributions.
We obtain $m_{\scriptscriptstyle W} = 80.357 \pm 0.009 \pm 0.003$ GeV where
the errors refer to the parametric and theoretical uncertainties, respectively.
A comparison with the known result in the On-Shell scheme gives a difference of
$ \approx 6$ MeV. As a byproduct of our calculation we also obtain the
$\overline{MS}$ electromagnetic coupling and the Weinberg angle at the top mass
scale, $\hat{\alpha} (M_t) = (127.73)^{-1} \pm 0.0000003$ and
$\sin^{2}\!\hat{\theta}_{W} (M_t) = 0.23462 \pm 0.00012$.
|
[
{
"created": "Tue, 25 Nov 2014 21:00:39 GMT",
"version": "v1"
}
] |
2014-11-28
|
[
[
"Degrassi",
"Giuseppe",
""
],
[
"Gambino",
"Paolo",
""
],
[
"Giardino",
"Pier Paolo",
""
]
] |
The $m_{\scriptscriptstyle W}-m_{\scriptscriptstyle Z}$ interdependence in the Standard Model is studied at $O(\alpha^2) $ in the $\overline{MS}$ scheme. The relevant radiative parameters, $\Delta \hat{\alpha} (\mu),\, \Delta \hat{r}_{W},\, \hat{\rho}$ are computed at the full two-loop level augmented by higher-order QCD contributions and by resummation of reducible contributions. We obtain $m_{\scriptscriptstyle W} = 80.357 \pm 0.009 \pm 0.003$ GeV where the errors refer to the parametric and theoretical uncertainties, respectively. A comparison with the known result in the On-Shell scheme gives a difference of $ \approx 6$ MeV. As a byproduct of our calculation we also obtain the $\overline{MS}$ electromagnetic coupling and the Weinberg angle at the top mass scale, $\hat{\alpha} (M_t) = (127.73)^{-1} \pm 0.0000003$ and $\sin^{2}\!\hat{\theta}_{W} (M_t) = 0.23462 \pm 0.00012$.
|
1602.00923
|
Treleani Daniele
|
Daniele Treleani and Giorgio Calucci
|
A Brief Comment on Multi-Gluon Amplitudes and Double Parton Interactions
|
5 pages, 5 figures. Prepared for the MPI@LHC2015, ICTP Trieste, Italy
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A typical contribution to a color ordered multi-gluon amplitude, which can
split into two weakly correlated two-body gluon scattering amplitudes and may
thus contribute to a Double Parton Interaction, is briefly discussed. We find
that the color ordered amplitude is not enhanced in the typical configuration
generated by a DPI, where the transverse momenta of final state gluons are
compensated pairwise, while a dominant contribution to the multi-gluon
amplitude is due to terms proportional to the fusion amplitude of two initial
state gluons. Which corresponds to an amplitude effectively describing a two
rather than a three-body partonic interaction.
|
[
{
"created": "Tue, 2 Feb 2016 13:52:14 GMT",
"version": "v1"
}
] |
2016-02-03
|
[
[
"Treleani",
"Daniele",
""
],
[
"Calucci",
"Giorgio",
""
]
] |
A typical contribution to a color ordered multi-gluon amplitude, which can split into two weakly correlated two-body gluon scattering amplitudes and may thus contribute to a Double Parton Interaction, is briefly discussed. We find that the color ordered amplitude is not enhanced in the typical configuration generated by a DPI, where the transverse momenta of final state gluons are compensated pairwise, while a dominant contribution to the multi-gluon amplitude is due to terms proportional to the fusion amplitude of two initial state gluons. Which corresponds to an amplitude effectively describing a two rather than a three-body partonic interaction.
|
hep-ph/0410399
|
Mike Whalley
|
M. R. Whalley
|
A New Neutrino Cross Section Database
|
6 pages, 3 figures, To appear in the proceedings of the 3rd
International Workshop on Neutrino Nucleus Interactions in the few GeV region
(NuInt04), Gran Sasso, Assergi, Italy, 17-21 Mar 2004
| null |
10.1016/j.nuclphysbps.2004.11.216
| null |
hep-ph
| null |
We describe a new web based data resource being developed to provide access
to accurate and validated cross sections of low energy neutrino and
antineutrino interactions. The proposed content of this database are outlined
which cover total and differential cross from inclusive, quasi-elastic and
exclusive pion production processes from charged and neutral current
interactions. Efforts to obtain these data, which come mainly from old bubble
chamber experiments, are described as well as the implementation of an
embryonic web site to make the resource generally accessible.
|
[
{
"created": "Fri, 29 Oct 2004 09:37:24 GMT",
"version": "v1"
}
] |
2009-11-10
|
[
[
"Whalley",
"M. R.",
""
]
] |
We describe a new web based data resource being developed to provide access to accurate and validated cross sections of low energy neutrino and antineutrino interactions. The proposed content of this database are outlined which cover total and differential cross from inclusive, quasi-elastic and exclusive pion production processes from charged and neutral current interactions. Efforts to obtain these data, which come mainly from old bubble chamber experiments, are described as well as the implementation of an embryonic web site to make the resource generally accessible.
|
hep-ph/9508354
|
Ulf Meissner
|
B. Borasoy and Ulf-G. Mei{\ss}ner
|
Baryon masses and pion-nucleon $\sigma$-term to second order in the
quark masses
|
11 pp, LaTeX, uses elsart.sty+elsart12.sty, fig. in separate file
|
Phys.Lett. B365 (1996) 285-291
|
10.1016/0370-2693(95)01286-9
|
TK 95 21
|
hep-ph nucl-th
| null |
We analyze the octet baryon masses and the pion--nucleon $\sigma$--term in
the framework of heavy baryon chiral perturbation theory. In contrast to
previous investigations, we include {\it all} terms up-to-and-including
quadratic order in the light quark masses. The pertinent low--energy constants
are fixed from resonance exchange. This leaves as the only free parameter the
baryon mass in the chiral limit, $\krig{m}$. We find $\krig{m} = 749 \pm
125$~MeV together with $\sigma_{\pi N} (0) = 48 \pm 10$ ~MeV. We discuss
various implications of these results.
|
[
{
"created": "Wed, 23 Aug 1995 14:06:06 GMT",
"version": "v1"
},
{
"created": "Thu, 24 Aug 1995 07:33:09 GMT",
"version": "v2"
}
] |
2009-10-28
|
[
[
"Borasoy",
"B.",
""
],
[
"Meißner",
"Ulf-G.",
""
]
] |
We analyze the octet baryon masses and the pion--nucleon $\sigma$--term in the framework of heavy baryon chiral perturbation theory. In contrast to previous investigations, we include {\it all} terms up-to-and-including quadratic order in the light quark masses. The pertinent low--energy constants are fixed from resonance exchange. This leaves as the only free parameter the baryon mass in the chiral limit, $\krig{m}$. We find $\krig{m} = 749 \pm 125$~MeV together with $\sigma_{\pi N} (0) = 48 \pm 10$ ~MeV. We discuss various implications of these results.
|
hep-ph/9211305
|
Francesca Borzumati
|
F.M. Borzumati, B.A. Kniehl, G. Kramer
|
Higher-Order QCD Corrections to Inclusive Particle Production in p
anti-p Collisions
|
28 pages, [12 uuencoded PS figures, 3 available under request].
Preprint DESY 92-135
|
Z.Phys. C57 (1993) 595-604
|
10.1007/BF01561478
| null |
hep-ph
| null |
Inclusive single-particle production cross sections have been calculated
including higher-order QCD corrections. Transverse-momentum and rapidity
distributions are presented and the scale dependence is studied. The results
are compared with experimental data from the CERN S(p anti-p)S Collider and the
Fermilab Tevatron.
|
[
{
"created": "Wed, 25 Nov 1992 17:11:02 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Nov 1992 15:53:13 GMT",
"version": "v2"
},
{
"created": "Sat, 28 Nov 1992 14:07:59 GMT",
"version": "v3"
}
] |
2009-10-22
|
[
[
"Borzumati",
"F. M.",
""
],
[
"Kniehl",
"B. A.",
""
],
[
"Kramer",
"G.",
""
]
] |
Inclusive single-particle production cross sections have been calculated including higher-order QCD corrections. Transverse-momentum and rapidity distributions are presented and the scale dependence is studied. The results are compared with experimental data from the CERN S(p anti-p)S Collider and the Fermilab Tevatron.
|
hep-ph/9907415
| null |
Flavio Pereira and Erasmo Ferreira
|
Zeros, Dips and Signs in pp and p$\rm\bf\bar p$ Elastic Amplitudes
|
LaTex, 9 pages, 5 figures. Submitted to Phys. Rev. D
|
Phys.Rev. D61 (2000) 077507
|
10.1103/PhysRevD.61.077507
| null |
hep-ph
| null |
The dips observed in the differential cross sections of elastic pp and
p$\bar{\rm p}$ scattering are studied in terms of the locations of the zeros of
the real and imaginary parts of the amplitude and of the sign of real part at
large $|t|$. It is confirmed that the differences in shapes of the dips in the
pp and p$\bar{\rm p}$ systems are determined by a change of sign of the real
tail, which seems to be determined by perturbative QCD contributions.
|
[
{
"created": "Mon, 19 Jul 1999 18:10:45 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Pereira",
"Flavio",
""
],
[
"Ferreira",
"Erasmo",
""
]
] |
The dips observed in the differential cross sections of elastic pp and p$\bar{\rm p}$ scattering are studied in terms of the locations of the zeros of the real and imaginary parts of the amplitude and of the sign of real part at large $|t|$. It is confirmed that the differences in shapes of the dips in the pp and p$\bar{\rm p}$ systems are determined by a change of sign of the real tail, which seems to be determined by perturbative QCD contributions.
|
1502.01171
|
R.C. Verma Dr.
|
R.C. Verma, Norikazu Yamada and Kosuke Odagiri
|
The First Estimates of Kinematically Forbidden D Meson Decays
|
11 pages
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The weak hadronic decay D^+ -> K^0\bar a_1^+ is kinematically forbidden at
the peak mass values of the particles involved. However, occurrence of this
decay has been reported with branching fraction (9.1 \plusminus 1.8) \cross
10^{-3} in the analysis of D^+ -> K^\bar0 4 \pi decay data. This is due to
smearing effects on this decay caused mainly by the large width of
a_1-resonance, which extends the phase space and allows this decay. Using a
factorization model to evaluate decay amplitudes for external and internal
W-emission diagrams, and incorporating Breit-Wigner smearing using the total
a_1 width of 400 MeV, we obtain the first estimate for branching fraction of
this decay to be 3.3 \cross 10^{-3} and 7.0 \cross 10^{-3}, for |V_1^{Da1}
(0)|=0.40 and 1.50 respectively corresponding to different theoretical models,
where |V_1^{Da1} (q^2)| is the vector form factor appearing in the D -> a_1
s-wave transition. The estimates are of the desired order of magnitude. We also
predict branching fractions of its counterpart decays D^0 -> K^-\bar a_1^+ and
D^0 -> K^0\bar a_1^0.
|
[
{
"created": "Wed, 4 Feb 2015 12:14:41 GMT",
"version": "v1"
}
] |
2015-02-05
|
[
[
"Verma",
"R. C.",
""
],
[
"Yamada",
"Norikazu",
""
],
[
"Odagiri",
"Kosuke",
""
]
] |
The weak hadronic decay D^+ -> K^0\bar a_1^+ is kinematically forbidden at the peak mass values of the particles involved. However, occurrence of this decay has been reported with branching fraction (9.1 \plusminus 1.8) \cross 10^{-3} in the analysis of D^+ -> K^\bar0 4 \pi decay data. This is due to smearing effects on this decay caused mainly by the large width of a_1-resonance, which extends the phase space and allows this decay. Using a factorization model to evaluate decay amplitudes for external and internal W-emission diagrams, and incorporating Breit-Wigner smearing using the total a_1 width of 400 MeV, we obtain the first estimate for branching fraction of this decay to be 3.3 \cross 10^{-3} and 7.0 \cross 10^{-3}, for |V_1^{Da1} (0)|=0.40 and 1.50 respectively corresponding to different theoretical models, where |V_1^{Da1} (q^2)| is the vector form factor appearing in the D -> a_1 s-wave transition. The estimates are of the desired order of magnitude. We also predict branching fractions of its counterpart decays D^0 -> K^-\bar a_1^+ and D^0 -> K^0\bar a_1^0.
|
2209.10945
|
Olli Koskivaara
|
Kimmo Kainulainen, Olli Koskivaara and Sami Nurmi
|
Tachyonic production of dark relics: a non-perturbative quantum study
|
21 pages, 8 figures
| null |
10.1007/JHEP04(2023)043
| null |
hep-ph astro-ph.CO gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study production of dark relics during reheating after the end of
inflation in a system consisting of a non-minimally coupled spectator scalar
field and the inflaton. We derive a set of renormalized quantum transport
equations for the one-point function and the two-point function of the
spectator field and solve them numerically. We find that our system can embody
both tachyonic and parametric instabilities. The former is an expected result
due to the non-minimal coupling, but the latter displays new features driven by
a novel interplay of the two-point function with the Ricci scalar. We find that
when the parametric instability driven by the two-point function takes place,
it dominates the total particle production. The quantitative results are also
found to be highly sensitive to the model parameters.
|
[
{
"created": "Thu, 22 Sep 2022 11:48:53 GMT",
"version": "v1"
}
] |
2023-05-03
|
[
[
"Kainulainen",
"Kimmo",
""
],
[
"Koskivaara",
"Olli",
""
],
[
"Nurmi",
"Sami",
""
]
] |
We study production of dark relics during reheating after the end of inflation in a system consisting of a non-minimally coupled spectator scalar field and the inflaton. We derive a set of renormalized quantum transport equations for the one-point function and the two-point function of the spectator field and solve them numerically. We find that our system can embody both tachyonic and parametric instabilities. The former is an expected result due to the non-minimal coupling, but the latter displays new features driven by a novel interplay of the two-point function with the Ricci scalar. We find that when the parametric instability driven by the two-point function takes place, it dominates the total particle production. The quantitative results are also found to be highly sensitive to the model parameters.
|
2406.05920
|
Jonathan Rosner
|
Marek Karliner and Jonathan L. Rosner
|
Possible mixing of a diquark-antidiquark with a $p \bar p$ hadronic
molecule
|
7 pages, one figure
| null | null |
EFI 24-4
|
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We discuss the possibility that the two nearby resonances observed by BESIII
partially below the \,$p\bar p$\, threshold might be due to mixing between two
metastable states with the same $J^{PC}=0^{-+}$ quantum numbers, but rather
different internal structure. One is a $p \bar p$ hadronic molecule and the
other a bound state of a light-quark diquark and an antidiquark, both with spin
1 and isospin 0, a composite color antitriplet and triplet, respectively. The
doubling of resonances, one of which may be interpreted as a hadronic molecule,
while the other arises from $q \bar q$ annihilation in a state with vacuum
quantum numbers may be a more general feature than the specific case considered
here.
|
[
{
"created": "Sun, 9 Jun 2024 21:25:09 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Jun 2024 22:31:03 GMT",
"version": "v2"
},
{
"created": "Tue, 13 Aug 2024 18:20:25 GMT",
"version": "v3"
}
] |
2024-08-15
|
[
[
"Karliner",
"Marek",
""
],
[
"Rosner",
"Jonathan L.",
""
]
] |
We discuss the possibility that the two nearby resonances observed by BESIII partially below the \,$p\bar p$\, threshold might be due to mixing between two metastable states with the same $J^{PC}=0^{-+}$ quantum numbers, but rather different internal structure. One is a $p \bar p$ hadronic molecule and the other a bound state of a light-quark diquark and an antidiquark, both with spin 1 and isospin 0, a composite color antitriplet and triplet, respectively. The doubling of resonances, one of which may be interpreted as a hadronic molecule, while the other arises from $q \bar q$ annihilation in a state with vacuum quantum numbers may be a more general feature than the specific case considered here.
|
0704.2798
|
Lance Dixon
|
Zvi Bern, Lance J. Dixon, David A. Kosower
|
On-Shell Methods in Perturbative QCD
|
49 pages, 15 figures. v2: minor typos corrected
|
Annals Phys.322:1587-1634,2007
|
10.1016/j.aop.2007.04.014
|
UCLA/07/TEP/11, SLAC-PUB-12447, SPhT-T07/039
|
hep-ph
| null |
We review on-shell methods for computing multi-parton scattering amplitudes
in perturbative QCD, utilizing their unitarity and factorization properties. We
focus on aspects which are useful for the construction of one-loop amplitudes
needed for phenomenological studies at the Large Hadron Collider.
|
[
{
"created": "Fri, 20 Apr 2007 21:48:53 GMT",
"version": "v1"
},
{
"created": "Wed, 30 May 2007 16:54:54 GMT",
"version": "v2"
}
] |
2010-11-15
|
[
[
"Bern",
"Zvi",
""
],
[
"Dixon",
"Lance J.",
""
],
[
"Kosower",
"David A.",
""
]
] |
We review on-shell methods for computing multi-parton scattering amplitudes in perturbative QCD, utilizing their unitarity and factorization properties. We focus on aspects which are useful for the construction of one-loop amplitudes needed for phenomenological studies at the Large Hadron Collider.
|
hep-ph/9707224
|
Aude Gehrmann
|
A. Gehrmann-De Ridder and E.W.N. Glover (Durham)
|
A complete ${\cal O}(\alpha \alpha_s)$ calculation of the Photon + 1 Jet
rate in $e^+e^-$ annihilation
|
59 pages, LaTeX, 8 Postscript figures included, a few typos
corrected, one reference added, version to appear in Nucl.Phys.B
|
Nucl.Phys.B517:269-323,1998
|
10.1016/S0550-3213(97)00818-3
|
DTP/97/26
|
hep-ph
| null |
We present a complete calculation of the photon +~1 jet rate in $e^+e^-$
annihilation up to ${\cal O}(\alpha \alpha_{s})$. Although formally of
next-to-leading order in perturbation theory, this calculation contains several
ingredients appropriate to a next-to-next-to-leading order calculation of jet
observables. In particular, we describe a generalization of the commonly used
phase space slicing method to isolate the singularities present when more than
one particle is unresolved. Within this approach, we analytically evaluate the
singularities associated with the following double unresolved regions; triple
collinear, soft/collinear and double single collinear configurations as well as
those from the collinear limit of virtual graphs. By comparing the results of
our calculation with the existing data on the photon +~1 jet rate from the
ALEPH Collaboration at CERN, we make a next-to-leading order determination of
the process-independent non-perturbative quark-to-photon fragmentation function
$D_{q \to \gamma}(z,\mu_{F})$ at ${\cal O}(\alpha \alpha_{s})$. As a first
application of this measurement allied with our improved perturbative
calculation, we determine the dependence of the isolated photon +~1 jet cross
section in a democratic clustering approach on the jet resolution parameter
$\ycut$ at next-to-leading order. The next-to-leading order corrections to this
observable are moderate but improve the agreement between theoretical
prediction and experimental data.
|
[
{
"created": "Wed, 2 Jul 1997 16:46:16 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Feb 1998 09:34:04 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Ridder",
"A. Gehrmann-De",
"",
"Durham"
],
[
"Glover",
"E. W. N.",
"",
"Durham"
]
] |
We present a complete calculation of the photon +~1 jet rate in $e^+e^-$ annihilation up to ${\cal O}(\alpha \alpha_{s})$. Although formally of next-to-leading order in perturbation theory, this calculation contains several ingredients appropriate to a next-to-next-to-leading order calculation of jet observables. In particular, we describe a generalization of the commonly used phase space slicing method to isolate the singularities present when more than one particle is unresolved. Within this approach, we analytically evaluate the singularities associated with the following double unresolved regions; triple collinear, soft/collinear and double single collinear configurations as well as those from the collinear limit of virtual graphs. By comparing the results of our calculation with the existing data on the photon +~1 jet rate from the ALEPH Collaboration at CERN, we make a next-to-leading order determination of the process-independent non-perturbative quark-to-photon fragmentation function $D_{q \to \gamma}(z,\mu_{F})$ at ${\cal O}(\alpha \alpha_{s})$. As a first application of this measurement allied with our improved perturbative calculation, we determine the dependence of the isolated photon +~1 jet cross section in a democratic clustering approach on the jet resolution parameter $\ycut$ at next-to-leading order. The next-to-leading order corrections to this observable are moderate but improve the agreement between theoretical prediction and experimental data.
|
1604.03905
|
Daniel G. Figueroa
|
Daniel G. Figueroa, Christian T. Byrnes
|
The Standard Model Higgs as the origin of the hot Big Bang
|
6 pages, 2 figures, minor changes with new figures to match published
version in PLB
| null |
10.1016/j.physletb.2017.01.059
|
CERN-TH-2016-088
|
hep-ph astro-ph.CO hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
If the Standard Model (SM) Higgs is weakly coupled to the inflationary
sector, the Higgs is expected to be universally in the form of a condensate
towards the end of inflation. The Higgs decays rapidly after inflation - via
non-perturbative effects - into an out-of-equilibrium distribution of SM
species, which thermalize soon afterwards. If the post-inflationary equation of
state of the universe is stiff, $w \simeq +1$, the SM species eventually
dominate the total energy budget. This provides a natural origin for the
relativistic thermal plasma of SM species, required for the onset of the `hot
Big Bang' era. The viability of this scenario requires the inflationary Hubble
scale $H_*$ to be lower than the instability scale for Higgs vacuum decay, the
Higgs not to generate too large curvature perturbations at cosmological scales,
and the SM dominance to occur before Big Bang Nucleosynthesis. We show that
successful reheating into the SM can only be obtained in the presence of a
non-minimal coupling to gravity $\xi \gtrsim 1$, with a reheating temperature
of $T_{\rm RH} \gtrsim \mathcal{O}(10^{10})\xi^{3/2}(H_*/10^{14}{\rm
GeV})^2~{\rm GeV}$.
|
[
{
"created": "Wed, 13 Apr 2016 18:32:10 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Jun 2017 16:46:01 GMT",
"version": "v2"
}
] |
2017-06-30
|
[
[
"Figueroa",
"Daniel G.",
""
],
[
"Byrnes",
"Christian T.",
""
]
] |
If the Standard Model (SM) Higgs is weakly coupled to the inflationary sector, the Higgs is expected to be universally in the form of a condensate towards the end of inflation. The Higgs decays rapidly after inflation - via non-perturbative effects - into an out-of-equilibrium distribution of SM species, which thermalize soon afterwards. If the post-inflationary equation of state of the universe is stiff, $w \simeq +1$, the SM species eventually dominate the total energy budget. This provides a natural origin for the relativistic thermal plasma of SM species, required for the onset of the `hot Big Bang' era. The viability of this scenario requires the inflationary Hubble scale $H_*$ to be lower than the instability scale for Higgs vacuum decay, the Higgs not to generate too large curvature perturbations at cosmological scales, and the SM dominance to occur before Big Bang Nucleosynthesis. We show that successful reheating into the SM can only be obtained in the presence of a non-minimal coupling to gravity $\xi \gtrsim 1$, with a reheating temperature of $T_{\rm RH} \gtrsim \mathcal{O}(10^{10})\xi^{3/2}(H_*/10^{14}{\rm GeV})^2~{\rm GeV}$.
|
hep-ph/0301121
|
Andrea Brignole
|
A. Brignole, J.A. Casas, J.R. Espinosa, I. Navarro
|
Low-scale supersymmetry breaking: effective description, electroweak
breaking and phenomenology
|
LaTeX, 47 pages, 5 figures; typos corrected, to appear in Nucl. Phys.
B
|
Nucl.Phys. B666 (2003) 105-143
|
10.1016/S0550-3213(03)00539-X
|
DFPD-02/TH/34
|
hep-ph hep-th
| null |
We consider supersymmetric scenarios in which the scale of SUSY breaking is
low, sqrt{F}=O(TeV). Instead of studying specific models of this type, e.g.
those with extra dimensions and low fundamental scale, we follow a
model-independent approach based on a general effective Lagrangian, in which
the MSSM supermultiplets are effectively coupled to a singlet associated to
SUSY breaking. Our goal is to analyse the interplay bewteen SUSY breaking and
electroweak breaking, generalizing earlier results. The conventional MSSM
picture can be substantially modified, mainly because the Higgs potential
contains additional effective quartic terms and resembles that of
two-Higgs-doublet models, with an additional singlet. Novel opportunities to
achieve electroweak breaking arise, and the electroweak scale may be obtained
in a less fine-tuned way. Also the Higgs spectrum can be strikingly changed,
and the lightest state can be much heavier than in usual supersymmetric
scenarios. Other effects appear in the chargino and neutralino sectors, which
contain the goldstino. Finally, we discuss the role of electroweak breaking in
processes in which two goldstinos could be emitted, such as fermion-antifermion
annihilation and the invisible decay of a Z boson or of neutral Higgs bosons.
|
[
{
"created": "Thu, 16 Jan 2003 19:19:19 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Jul 2003 14:42:12 GMT",
"version": "v2"
}
] |
2010-04-05
|
[
[
"Brignole",
"A.",
""
],
[
"Casas",
"J. A.",
""
],
[
"Espinosa",
"J. R.",
""
],
[
"Navarro",
"I.",
""
]
] |
We consider supersymmetric scenarios in which the scale of SUSY breaking is low, sqrt{F}=O(TeV). Instead of studying specific models of this type, e.g. those with extra dimensions and low fundamental scale, we follow a model-independent approach based on a general effective Lagrangian, in which the MSSM supermultiplets are effectively coupled to a singlet associated to SUSY breaking. Our goal is to analyse the interplay bewteen SUSY breaking and electroweak breaking, generalizing earlier results. The conventional MSSM picture can be substantially modified, mainly because the Higgs potential contains additional effective quartic terms and resembles that of two-Higgs-doublet models, with an additional singlet. Novel opportunities to achieve electroweak breaking arise, and the electroweak scale may be obtained in a less fine-tuned way. Also the Higgs spectrum can be strikingly changed, and the lightest state can be much heavier than in usual supersymmetric scenarios. Other effects appear in the chargino and neutralino sectors, which contain the goldstino. Finally, we discuss the role of electroweak breaking in processes in which two goldstinos could be emitted, such as fermion-antifermion annihilation and the invisible decay of a Z boson or of neutral Higgs bosons.
|
hep-ph/0211132
|
Bennie F. L. Ward
|
B.F.L. Ward (1), S. Jadach (2) and Z. Was (2) ((1) Department of
Physics and Astronomy, University of Tennessee, Knoxville, TN, USA, (2)
Henryk Niewodniczanski Institute of Nuclear Physics, Cracow, Poland)
|
Precision calculation for e+ e- -> 2f: the KK MC project
|
5 pages, 4 figures, 2 diagrams - presented by BFLW at RADCOR02
|
Nucl.Phys.Proc.Suppl. 116 (2003) 73-77
|
10.1016/S0920-5632(03)80147-0
|
UTHEP-02-0901
|
hep-ph
| null |
We present the current status of the coherent exclusive (CEEX) realization of
the YFS theory for the processes in e+ e- -> 2f via the KK MC. We give a brief
summary of the CEEX theory in comparison to the older (EEX) exclusive
exponentiation theory and illustrate recent theoretical results relevant to the
LEP2 and LC physics programs.
|
[
{
"created": "Sat, 9 Nov 2002 15:31:22 GMT",
"version": "v1"
}
] |
2009-11-07
|
[
[
"Ward",
"B. F. L.",
""
],
[
"Jadach",
"S.",
""
],
[
"Was",
"Z.",
""
]
] |
We present the current status of the coherent exclusive (CEEX) realization of the YFS theory for the processes in e+ e- -> 2f via the KK MC. We give a brief summary of the CEEX theory in comparison to the older (EEX) exclusive exponentiation theory and illustrate recent theoretical results relevant to the LEP2 and LC physics programs.
|
1903.08296
|
Lucas Johns
|
Lucas Johns and George M. Fuller
|
Self-interacting sterile neutrino dark matter: the heavy-mediator case
|
10 pages, 6 figures
|
Phys. Rev. D 100, 023533 (2019)
|
10.1103/PhysRevD.100.023533
| null |
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
For active-sterile mixing to be responsible for the full relic abundance of
dark matter additional new physics is needed beyond the keV-scale sterile
neutrino itself. The extra ingredient we consider here is the presence of
self-interactions among the sterile neutrinos. We examine whether
active-to-sterile conversion is amplified enough in this scenario that the
observed abundance of dark matter can be obtained with a subconstraint mixing
angle. This turns out never to be the case in the region we explore: either
self-interactions have too small an impact and cannot escape bounds on the mass
and mixing angle, or they have too great an impact and cause dark matter to be
overproduced. The sharp transition from marginal to excessive effectiveness
occurs because a resonance criterion is met in the effective in-medium mixing
angle. Once the system goes resonant the game is as good as over, as
nonlinearity in the Boltzmann equation leads to runaway production of sterile
neutrinos, beginning at a plasma temperature of a few hundred MeV and typically
ending at a few tens of MeV. The scenario is therefore ruled out largely by its
own dynamics. In this study we focus exclusively on mediators heavier than
$\sim 1$ GeV; future work will extend the analysis to lighter mediators,
allowing for contact to be made with the kinds of scenarios motivated by issues
of small-scale structure.
|
[
{
"created": "Wed, 20 Mar 2019 00:19:46 GMT",
"version": "v1"
},
{
"created": "Sat, 3 Aug 2019 23:05:33 GMT",
"version": "v2"
}
] |
2019-08-06
|
[
[
"Johns",
"Lucas",
""
],
[
"Fuller",
"George M.",
""
]
] |
For active-sterile mixing to be responsible for the full relic abundance of dark matter additional new physics is needed beyond the keV-scale sterile neutrino itself. The extra ingredient we consider here is the presence of self-interactions among the sterile neutrinos. We examine whether active-to-sterile conversion is amplified enough in this scenario that the observed abundance of dark matter can be obtained with a subconstraint mixing angle. This turns out never to be the case in the region we explore: either self-interactions have too small an impact and cannot escape bounds on the mass and mixing angle, or they have too great an impact and cause dark matter to be overproduced. The sharp transition from marginal to excessive effectiveness occurs because a resonance criterion is met in the effective in-medium mixing angle. Once the system goes resonant the game is as good as over, as nonlinearity in the Boltzmann equation leads to runaway production of sterile neutrinos, beginning at a plasma temperature of a few hundred MeV and typically ending at a few tens of MeV. The scenario is therefore ruled out largely by its own dynamics. In this study we focus exclusively on mediators heavier than $\sim 1$ GeV; future work will extend the analysis to lighter mediators, allowing for contact to be made with the kinds of scenarios motivated by issues of small-scale structure.
|
2209.02619
|
Wojciech Broniowski
|
Vanamali Shastry, Wojciech Broniowski, Enrique Ruiz Arriola
|
Generalized quasi, Ioffe-time, and pseudo quark distributions of the
pion in the Nambu--Jona-Lasinio model
|
extended discussion and a reference added, 23 pages, 12 figures
| null |
10.1103/PhysRevD.106.114035
| null |
hep-ph hep-lat
|
http://creativecommons.org/licenses/by/4.0/
|
We analyze the generalized quasi, Ioffe-time, and pseudo distributions of the
valence quarks in the pion at the quark model scale. We use the framework of
the Nambu-Jona-Lasinio model and investigate the basic question of how fast the
pion has to move to effectively reach the infinite momentum limit, where the
approach can provide the information on the generalized parton distribution
functions. We consider both the vector distributions and the transversity
distributions, related to the spin densities. With the developed analytic
expressions, we conclude that to effectively approach the infinite momentum
limit, one roughly needs the pion momenta of the order of $\sim 3$GeV. We also
explore polynomiality of the quasi distributions and study the generalized
quasi form factors. The issue of separability of the transverse and
longitudinal dynamics in the model is studied with the help of the generalized
Ioffe-time distributions, with the conclusion that the breaking is not
substantial, unless the momentum transfer $t$ is large. We also provide an
estimate of the range of the Ioffe-time values needed to obtain the generalized
parton distributions with a reasonable accuracy. Our model results, which are
analytic or semi-analytic, provide a valuable insight into the theoretical
formalism and illustrate the intricate features of the investigated
distributions.
|
[
{
"created": "Tue, 6 Sep 2022 16:18:30 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Nov 2022 20:17:08 GMT",
"version": "v2"
}
] |
2023-01-11
|
[
[
"Shastry",
"Vanamali",
""
],
[
"Broniowski",
"Wojciech",
""
],
[
"Arriola",
"Enrique Ruiz",
""
]
] |
We analyze the generalized quasi, Ioffe-time, and pseudo distributions of the valence quarks in the pion at the quark model scale. We use the framework of the Nambu-Jona-Lasinio model and investigate the basic question of how fast the pion has to move to effectively reach the infinite momentum limit, where the approach can provide the information on the generalized parton distribution functions. We consider both the vector distributions and the transversity distributions, related to the spin densities. With the developed analytic expressions, we conclude that to effectively approach the infinite momentum limit, one roughly needs the pion momenta of the order of $\sim 3$GeV. We also explore polynomiality of the quasi distributions and study the generalized quasi form factors. The issue of separability of the transverse and longitudinal dynamics in the model is studied with the help of the generalized Ioffe-time distributions, with the conclusion that the breaking is not substantial, unless the momentum transfer $t$ is large. We also provide an estimate of the range of the Ioffe-time values needed to obtain the generalized parton distributions with a reasonable accuracy. Our model results, which are analytic or semi-analytic, provide a valuable insight into the theoretical formalism and illustrate the intricate features of the investigated distributions.
|
2107.14300
|
Pierre Sikivie
|
Pierre Sikivie
|
Clean energy from dark matter?
|
5 pages, no figures
| null | null | null |
hep-ph astro-ph.GA physics.app-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A contribution to Frank Wilczek's 70th birthday's festschrift, this brief
note considers how much power can be extracted from dark matter.
|
[
{
"created": "Thu, 29 Jul 2021 19:56:57 GMT",
"version": "v1"
}
] |
2021-08-02
|
[
[
"Sikivie",
"Pierre",
""
]
] |
A contribution to Frank Wilczek's 70th birthday's festschrift, this brief note considers how much power can be extracted from dark matter.
|
1808.04774
|
Bhavesh Chauhan
|
Bhavesh Chauhan, Subhendra Mohanty
|
Signature of light sterile neutrinos at IceCube
|
version to appear in Phys. Rev. D
|
Phys. Rev. D 98, 083021 (2018)
|
10.1103/PhysRevD.98.083021
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The MiniBooNe collaboration has recently reported evidence for a light
sterile neutrino with large mixing angles thus corroborating the measurement by
LSND twenty years ago. Such a state would be directly in conflict with Planck
measurement of BBN $N_{eff}$ unless there is self-interaction in the sterile
sector. Our objective is to investigate if such interactions could result in
resonant absorption in the cosmogenic neutrino spectrum and its consequences
for the IceCube experiment. We show that it is possible to give independent
bounds on sterile neutrino parameter space from IceCube observations with the
dips in the spectrum corresponding to the neutrino masses.
|
[
{
"created": "Tue, 14 Aug 2018 16:12:16 GMT",
"version": "v1"
},
{
"created": "Sun, 21 Oct 2018 15:48:16 GMT",
"version": "v2"
}
] |
2018-10-31
|
[
[
"Chauhan",
"Bhavesh",
""
],
[
"Mohanty",
"Subhendra",
""
]
] |
The MiniBooNe collaboration has recently reported evidence for a light sterile neutrino with large mixing angles thus corroborating the measurement by LSND twenty years ago. Such a state would be directly in conflict with Planck measurement of BBN $N_{eff}$ unless there is self-interaction in the sterile sector. Our objective is to investigate if such interactions could result in resonant absorption in the cosmogenic neutrino spectrum and its consequences for the IceCube experiment. We show that it is possible to give independent bounds on sterile neutrino parameter space from IceCube observations with the dips in the spectrum corresponding to the neutrino masses.
|
hep-ph/9607227
|
Uma Mahanta
|
Uma Mahanta
|
Implications of m_t and R_b on zt\bar{t} couplings in standard ETC
models
|
Revised version submitted with recent LEP data on R_b
|
Phys.Lett. B392 (1997) 145-149
|
10.1016/S0370-2693(96)01535-3
|
MRI-PHY-96-21
|
hep-ph
| null |
In standard ETC models the sideways and diagonal ETC interactions contribute
to $\delta R_b$ with opposite signs. The aim of this article is to study the
implications of the CDF value for m_t and the LEP value for R_b on $zt\bar{t}$
couplings where the LH sideways and diagonal ETC effects interfere
constructively. We find that for m_t=175 Gev, $\delta R_b =.0022$ and
m^2_s=m^2_d, F^t_v and F^t_a are modified by 19% and 7% respectively from their
SM values. The constrains implied by these deviations on diagonal ETC scenarios
and the feasibility of probing them at NLC through polarization and angular
distribution studies in $e^+e^- \to t\bar{t}$ are also considered.
|
[
{
"created": "Wed, 3 Jul 1996 10:16:36 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Nov 1996 21:43:20 GMT",
"version": "v2"
}
] |
2016-09-06
|
[
[
"Mahanta",
"Uma",
""
]
] |
In standard ETC models the sideways and diagonal ETC interactions contribute to $\delta R_b$ with opposite signs. The aim of this article is to study the implications of the CDF value for m_t and the LEP value for R_b on $zt\bar{t}$ couplings where the LH sideways and diagonal ETC effects interfere constructively. We find that for m_t=175 Gev, $\delta R_b =.0022$ and m^2_s=m^2_d, F^t_v and F^t_a are modified by 19% and 7% respectively from their SM values. The constrains implied by these deviations on diagonal ETC scenarios and the feasibility of probing them at NLC through polarization and angular distribution studies in $e^+e^- \to t\bar{t}$ are also considered.
|
hep-ph/9404215
| null |
Hans-Thomas Elze
|
Quantum Decoherence, Entropy and Thermalization in Strong Interactions
at High Energy
|
45 pages, 2 figures
|
Nucl.Phys.B436:213-264,1995
|
10.1016/0550-3213(94)00523-H
| null |
hep-ph
| null |
Entropy is generated in high-multiplying events by a dynamical separation of
strongly interacting systems into partons and unobservable environment modes
(almost constant field configurations) due to confinement.
|
[
{
"created": "Tue, 5 Apr 1994 12:50:36 GMT",
"version": "v1"
}
] |
2011-08-04
|
[
[
"Elze",
"Hans-Thomas",
""
]
] |
Entropy is generated in high-multiplying events by a dynamical separation of strongly interacting systems into partons and unobservable environment modes (almost constant field configurations) due to confinement.
|
1606.01298
|
Li Cheng
|
Li Cheng and German Valencia
|
Two Higgs doublet models augmented by a scalar color octet
|
23 pages, 10 figures; Matched the publication version
| null |
10.1007/JHEP09(2016)079
|
CoEPP-MN-16-15
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The LHC is now studying in detail the couplings of the Higgs boson in order
to determine if there is new physics. Many recent studies have examined the
available fits to Higgs couplings from the perspective of constraining two
Higgs doublet models (2HDM). In this paper we extend those studies to include
constraints on the one loop couplings of the Higgs to gluons and photons. These
couplings are particularly sensitive to the existence of new colored particles
that are hard to detect otherwise and we use them to constrain a 2HDM augmented
with a color-octet scalar, a possibility motivated by minimal flavor violation.
We first study theoretical constraints on this model and then compare them with
LHC measurements.
|
[
{
"created": "Fri, 3 Jun 2016 22:48:26 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Jun 2016 18:30:02 GMT",
"version": "v2"
},
{
"created": "Tue, 13 Sep 2016 21:37:58 GMT",
"version": "v3"
}
] |
2016-10-12
|
[
[
"Cheng",
"Li",
""
],
[
"Valencia",
"German",
""
]
] |
The LHC is now studying in detail the couplings of the Higgs boson in order to determine if there is new physics. Many recent studies have examined the available fits to Higgs couplings from the perspective of constraining two Higgs doublet models (2HDM). In this paper we extend those studies to include constraints on the one loop couplings of the Higgs to gluons and photons. These couplings are particularly sensitive to the existence of new colored particles that are hard to detect otherwise and we use them to constrain a 2HDM augmented with a color-octet scalar, a possibility motivated by minimal flavor violation. We first study theoretical constraints on this model and then compare them with LHC measurements.
|
hep-ph/9307201
| null |
Howard E. Haber and Ralf Hempfling
|
The Renormalization-Group Improved Higgs Sector of the Minimal
Supersymmetric Model
|
51 pages, SCIPP-91/33 (July, 1992; revised June, 1993), PHYZZX
macropackage
|
Phys.Rev. D48 (1993) 4280-4309
|
10.1103/PhysRevD.48.4280
| null |
hep-ph
| null |
In the minimal supersymmetric model (MSSM) all Higgs self-coupling parameters
are related to gauge couplings at tree-level. Leading-logarithmic radiative
corrections to these quantities can be summed using renormalization group
techniques. By this procedure we obtain complete leading-log radiative
corrections to the Higgs masses, the CP-even Higgs mixing angle, and trilinear
Higgs couplings. Additional corrections due to squark mixing can be explicitly
incorporated into this formalism. These results incorporate nearly all
potentially large corrections. Mass shifts to the neutral CP-even Higgs bosons
grow with the fourth power of the top-quark mass and can be significant. The
phenomenological consequences of these results are examined.
|
[
{
"created": "Thu, 1 Jul 1993 08:44:00 GMT",
"version": "v1"
}
] |
2009-10-22
|
[
[
"Haber",
"Howard E.",
""
],
[
"Hempfling",
"Ralf",
""
]
] |
In the minimal supersymmetric model (MSSM) all Higgs self-coupling parameters are related to gauge couplings at tree-level. Leading-logarithmic radiative corrections to these quantities can be summed using renormalization group techniques. By this procedure we obtain complete leading-log radiative corrections to the Higgs masses, the CP-even Higgs mixing angle, and trilinear Higgs couplings. Additional corrections due to squark mixing can be explicitly incorporated into this formalism. These results incorporate nearly all potentially large corrections. Mass shifts to the neutral CP-even Higgs bosons grow with the fourth power of the top-quark mass and can be significant. The phenomenological consequences of these results are examined.
|
0711.1708
|
Jihn E. Kim
|
Jihn E. Kim
|
Axion as a CDM component
|
9 pages with 11 figures. Based on talks at Lepton-Photon 2007 and
APPC10
| null | null |
SNUTP 07-11
|
hep-ph astro-ph hep-th
| null |
I discuss the essential features of the QCD axion: the strong CP solution and
hence its theoretical necessity. I also review the effects of the QCD axion on
astrophysics and cosmology, in particular with emphasis on its role in the dark
matter component together with its supersymmetric partner axino. It is pointed
out that string theory may or may not give a detectable QCD axion.
|
[
{
"created": "Mon, 12 Nov 2007 04:45:32 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Nov 2007 05:02:43 GMT",
"version": "v2"
}
] |
2007-11-20
|
[
[
"Kim",
"Jihn E.",
""
]
] |
I discuss the essential features of the QCD axion: the strong CP solution and hence its theoretical necessity. I also review the effects of the QCD axion on astrophysics and cosmology, in particular with emphasis on its role in the dark matter component together with its supersymmetric partner axino. It is pointed out that string theory may or may not give a detectable QCD axion.
|
2105.03272
|
Yasaman Farzan
|
Yasaman Farzan
|
On the Tau flavor of the cosmic neutrino flux
|
18 pages, 3 figures; v2: matching JHEP version; comment on intrinsic
c quark added
|
JHEP 07 (2021) 174
|
10.1007/JHEP07(2021)174
| null |
hep-ph astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Observation of high energy cosmic neutrinos by ICECUBE has ushered in a new
era in exploring both cosmos and new physics beyond the Standard Model (SM). In
the standard picture, although mostly $\nu_\mu$ and $\nu_e$ are produced in the
source, oscillation will produce $\nu_\tau$ {\it en route}. Certain beyond SM
scenarios, like interaction with ultralight DM can alter this picture. Thus,
the flavor composition of the cosmic neutrino flux can open up the possibility
of exploring certain beyond the SM scenarios that are inaccessible otherwise.
We show that the $\tau$ flavor holds a special place among the neutrino flavors
in elucidating new physics. Interpreting the two anomalous events observed by
ANITA as $\nu_\tau$ events makes the tau flavor even more intriguing. We study
how the detection of the two tau events by ICECUBE constrains the interaction
of the neutrinos with ultralight dark matter and discuss the implications of
this interaction for even higher energy cosmic neutrinos detectable by future
radio telescopes such as ARA, ARIANNA and GRAND. We also revisit the $3+1$
neutrino scheme as a solution to the two anomalous ANITA events and clarify a
misconception that exists in the literature about the evolution of high energy
neutrinos in matter within the $3+1$ scheme with a possibility of scattering
off nuclei. We show that the existing bounds on the flux of $\nu_\tau$ with
energy of EeV rules out this solution for the ANITA events. We show that the
$3+1$ solution can be saved from both this bound and from the bound on the
extra relativistic degrees of freedom in the early universe by turning on the
interaction of neutrinos with ultralight dark matter.
|
[
{
"created": "Fri, 7 May 2021 13:53:15 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Aug 2021 18:09:44 GMT",
"version": "v2"
}
] |
2021-08-20
|
[
[
"Farzan",
"Yasaman",
""
]
] |
Observation of high energy cosmic neutrinos by ICECUBE has ushered in a new era in exploring both cosmos and new physics beyond the Standard Model (SM). In the standard picture, although mostly $\nu_\mu$ and $\nu_e$ are produced in the source, oscillation will produce $\nu_\tau$ {\it en route}. Certain beyond SM scenarios, like interaction with ultralight DM can alter this picture. Thus, the flavor composition of the cosmic neutrino flux can open up the possibility of exploring certain beyond the SM scenarios that are inaccessible otherwise. We show that the $\tau$ flavor holds a special place among the neutrino flavors in elucidating new physics. Interpreting the two anomalous events observed by ANITA as $\nu_\tau$ events makes the tau flavor even more intriguing. We study how the detection of the two tau events by ICECUBE constrains the interaction of the neutrinos with ultralight dark matter and discuss the implications of this interaction for even higher energy cosmic neutrinos detectable by future radio telescopes such as ARA, ARIANNA and GRAND. We also revisit the $3+1$ neutrino scheme as a solution to the two anomalous ANITA events and clarify a misconception that exists in the literature about the evolution of high energy neutrinos in matter within the $3+1$ scheme with a possibility of scattering off nuclei. We show that the existing bounds on the flux of $\nu_\tau$ with energy of EeV rules out this solution for the ANITA events. We show that the $3+1$ solution can be saved from both this bound and from the bound on the extra relativistic degrees of freedom in the early universe by turning on the interaction of neutrinos with ultralight dark matter.
|
hep-ph/0505259
|
Sergey Ostapchenko
|
S. Ostapchenko
|
Non-linear screening effects in high energy hadronic interactions
|
New version; calculation of single diffraction cross section included
|
Phys.Rev.D74:014026,2006
|
10.1103/PhysRevD.74.014026
| null |
hep-ph
| null |
Non-linear effects in hadronic interactions are treated by means of enhanced
pomeron diagrams, assuming that pomeron-pomeron coupling is dominated by soft
partonic processes. It is shown that the approach allows to resolve a seeming
contradiction between realistic parton momentum distributions, measured in deep
inelastic scattering experiments, and the energy behavior of total
proton-proton cross section. Also a general consistency with both ``soft'' and
``hard'' diffraction data is demonstrated. An important feature of the proposed
scheme is that the contribution of semi-hard processes to the interaction
eikonal contains a significant non-factorizable part. On the other hand, the
approach preserves the QCD factorization picture for inclusive high p_t jet
production.
|
[
{
"created": "Mon, 30 May 2005 16:41:27 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Mar 2006 12:03:01 GMT",
"version": "v2"
},
{
"created": "Thu, 22 Jun 2006 18:47:56 GMT",
"version": "v3"
}
] |
2011-07-19
|
[
[
"Ostapchenko",
"S.",
""
]
] |
Non-linear effects in hadronic interactions are treated by means of enhanced pomeron diagrams, assuming that pomeron-pomeron coupling is dominated by soft partonic processes. It is shown that the approach allows to resolve a seeming contradiction between realistic parton momentum distributions, measured in deep inelastic scattering experiments, and the energy behavior of total proton-proton cross section. Also a general consistency with both ``soft'' and ``hard'' diffraction data is demonstrated. An important feature of the proposed scheme is that the contribution of semi-hard processes to the interaction eikonal contains a significant non-factorizable part. On the other hand, the approach preserves the QCD factorization picture for inclusive high p_t jet production.
|
hep-ph/0602021
|
Juan Jose Sanz-Cillero
|
J. J. Sanz-Cillero
|
V+A and V-A Correlators at Large NC: From OPE to Resonance Theory
|
6 pages, 2 figures, proceedings of the talk given at HSQCD 2005, St.
Petersburg, Russia, September 20-24 2005
| null | null | null |
hep-ph
| null |
The spin-1 correlators are analysed in this talk through a large NC resonance
theory. The matching to perturbative QCD and the first terms in the OPE
constrains the hadronic parameters. A further sum-rule analysis shows the wider
range of validity of the resonance description, which can help to discern the
proper structure of the QCD mass spectrum.
|
[
{
"created": "Thu, 2 Feb 2006 11:30:19 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Sanz-Cillero",
"J. J.",
""
]
] |
The spin-1 correlators are analysed in this talk through a large NC resonance theory. The matching to perturbative QCD and the first terms in the OPE constrains the hadronic parameters. A further sum-rule analysis shows the wider range of validity of the resonance description, which can help to discern the proper structure of the QCD mass spectrum.
|
1705.01063
|
Benjamin Fuks
|
Jack Y. Araz, Mariana Frank, Benjamin Fuks
|
Differentiating $U(1)^\prime$ supersymmetric models with right sneutrino
and neutralino dark matter
|
21 pages, 11 figures, version accepted by PRD
|
Phys. Rev. D 96, 015017 (2017)
|
10.1103/PhysRevD.96.015017
|
CUMQ/HEP 194
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We perform a detailed analysis of dark matter signals of supersymmetric
models containing an extra $U(1)^\prime$ gauge group. We investigate scenarios
in which either the right sneutrino or the lightest neutralino are
phenomenologically acceptable dark matter candidates and we explore the
parameter spaces of different supersymmetric realisations featuring an extra
$U(1)^\prime$. We impose consistency with low energy observables, with known
mass limits for the superpartners and $Z^\prime$ bosons, as well as with Higgs
boson signal strengths, and we moreover verify that predictions for the
anomalous magnetic moment of the muon agree with the experimental value and
require that the dark matter candidate satisfies the observed relic density and
direct and indirect dark matter detection constraints. For the case where the
sneutrino is the dark matter candidate, we find distinguishing characteristics
among different $U(1)^\prime$ mixing angles. If the neutralino is the lightest
supersymmetric particle, its mass is heavier than that of the light sneutrino
in scenarios where the latter is a dark matter candidate, the parameter space
is less restricted and differentiation between models is more difficult. We
finally comment on the possible collider tests of these models.
|
[
{
"created": "Tue, 2 May 2017 16:43:58 GMT",
"version": "v1"
},
{
"created": "Tue, 18 Jul 2017 15:43:38 GMT",
"version": "v2"
}
] |
2017-07-26
|
[
[
"Araz",
"Jack Y.",
""
],
[
"Frank",
"Mariana",
""
],
[
"Fuks",
"Benjamin",
""
]
] |
We perform a detailed analysis of dark matter signals of supersymmetric models containing an extra $U(1)^\prime$ gauge group. We investigate scenarios in which either the right sneutrino or the lightest neutralino are phenomenologically acceptable dark matter candidates and we explore the parameter spaces of different supersymmetric realisations featuring an extra $U(1)^\prime$. We impose consistency with low energy observables, with known mass limits for the superpartners and $Z^\prime$ bosons, as well as with Higgs boson signal strengths, and we moreover verify that predictions for the anomalous magnetic moment of the muon agree with the experimental value and require that the dark matter candidate satisfies the observed relic density and direct and indirect dark matter detection constraints. For the case where the sneutrino is the dark matter candidate, we find distinguishing characteristics among different $U(1)^\prime$ mixing angles. If the neutralino is the lightest supersymmetric particle, its mass is heavier than that of the light sneutrino in scenarios where the latter is a dark matter candidate, the parameter space is less restricted and differentiation between models is more difficult. We finally comment on the possible collider tests of these models.
|
hep-ph/9511325
| null |
Wei Lu, Xue Qian Li and Haiming Hu
|
Spin-dependent structure functions $\hat g_1$ and $\hat g_2$ for
inclusive spin-half baryon production in electron-positron annihilation
|
RevTex, four Ps figures, to appear in Phys. Rev. D
|
Phys.Rev. D53 (1996) 131-137
|
10.1103/PhysRevD.53.131
| null |
hep-ph
| null |
Two spin-dependent structure functions $\hat g_1$ and $\hat g_2$ for the
inclusive spin-half baryon production in electron-positron annihilation are
studied in the context of QCD factorization as well as in the naive quark
parton model. As a result, it is found that the sum of $\hat g_1$ and $\hat
g_2$ is related to $\hat h_1$ and $\hat g_T$, two quark fragmentation functions
defined by Jaffe and Ji. In connection with the measurement of quark
fragmentation functions, the possible phenomenological consequences are
discussed.
|
[
{
"created": "Thu, 16 Nov 1995 00:24:53 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Nov 1995 13:06:48 GMT",
"version": "v2"
}
] |
2009-10-28
|
[
[
"Lu",
"Wei",
""
],
[
"Li",
"Xue Qian",
""
],
[
"Hu",
"Haiming",
""
]
] |
Two spin-dependent structure functions $\hat g_1$ and $\hat g_2$ for the inclusive spin-half baryon production in electron-positron annihilation are studied in the context of QCD factorization as well as in the naive quark parton model. As a result, it is found that the sum of $\hat g_1$ and $\hat g_2$ is related to $\hat h_1$ and $\hat g_T$, two quark fragmentation functions defined by Jaffe and Ji. In connection with the measurement of quark fragmentation functions, the possible phenomenological consequences are discussed.
|
1810.09101
|
Ning Yu
|
Ning Yu and Xiaofeng Luo
|
Particle decay from statistical thermal model in high energy
nucleus-nucleus collision
|
15 pages, 9 figures
|
Eur. Phys. J. A (2019) 55:26
|
10.1140/epja/i2019-12691-8
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In high energy nucleus-nucleus collisions, it is difficult to measure the
contributions of resonance strong decay and weak decay to the final measured
hadrons as well as the corresponding effects on some physical observables. To
provide a reference from statistical thermal model, we performed a systematic
analysis for the energy dependence of particle yield and yield ratios in Au +
Au collisions. We found that the primary fraction of final hadrons decreases
with increasing collision energy and somehow saturates around
$\sqrt{s_\textrm{NN}}$ = 10 GeV, indicating a limiting temperature in hadronic
interactions. The fraction of strong or weak decay for final hadrons show a
different energy dependence behavior comparing to the primarily produced
hadrons. These energy dependences of various particle yield and yield ratios
from strong or weak decay can provide us with baselines for many hadronic
observables in high energy nucleus-nucleus collisions.
|
[
{
"created": "Mon, 22 Oct 2018 06:22:45 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Nov 2018 07:59:07 GMT",
"version": "v2"
},
{
"created": "Thu, 21 Feb 2019 12:52:41 GMT",
"version": "v3"
}
] |
2019-02-22
|
[
[
"Yu",
"Ning",
""
],
[
"Luo",
"Xiaofeng",
""
]
] |
In high energy nucleus-nucleus collisions, it is difficult to measure the contributions of resonance strong decay and weak decay to the final measured hadrons as well as the corresponding effects on some physical observables. To provide a reference from statistical thermal model, we performed a systematic analysis for the energy dependence of particle yield and yield ratios in Au + Au collisions. We found that the primary fraction of final hadrons decreases with increasing collision energy and somehow saturates around $\sqrt{s_\textrm{NN}}$ = 10 GeV, indicating a limiting temperature in hadronic interactions. The fraction of strong or weak decay for final hadrons show a different energy dependence behavior comparing to the primarily produced hadrons. These energy dependences of various particle yield and yield ratios from strong or weak decay can provide us with baselines for many hadronic observables in high energy nucleus-nucleus collisions.
|
1806.02177
|
Pok Man Lo
|
C\'esar Fern\'andez-Ram\'irez, Pok Man Lo, Peter Petreczky
|
Thermodynamics of strange baryon system from coupled-channel analysis
and missing states
|
10 pages, 7 figures; version appear in PRC with typos. in Fig.4
corrected
|
Phys. Rev. C 98, 044910 (2018)
|
10.1103/PhysRevC.98.044910
| null |
hep-ph hep-lat
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the thermodynamics of the strange baryon system using an S-matrix
formulation of statistical mechanics. For this purpose, we employ an existing
coupled-channel study involving $\bar{K} N$, $\pi \Lambda$, and $\pi \Sigma$
interactions in the $S=-1$ sector. A novel method is proposed to extract an
effective phase shift due to the interaction, which can subsequently be used to
compute various thermal observables via a relativistic virial expansion. As an
application of the calculation scheme, we compute the correlation of the net
baryon number with strangeness ($\chi_{BS}$) for an interacting hadron gas. We
show that the S-matrix approach, which entails a consistent treatment of
resonances and naturally incorporates the additional hyperon states which are
not listed by the Particle Data Group, leads to an improved description of the
lattice data over the Hadron Resonance Gas model.
|
[
{
"created": "Wed, 6 Jun 2018 13:37:38 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Dec 2018 07:07:46 GMT",
"version": "v2"
}
] |
2018-12-17
|
[
[
"Fernández-Ramírez",
"César",
""
],
[
"Lo",
"Pok Man",
""
],
[
"Petreczky",
"Peter",
""
]
] |
We study the thermodynamics of the strange baryon system using an S-matrix formulation of statistical mechanics. For this purpose, we employ an existing coupled-channel study involving $\bar{K} N$, $\pi \Lambda$, and $\pi \Sigma$ interactions in the $S=-1$ sector. A novel method is proposed to extract an effective phase shift due to the interaction, which can subsequently be used to compute various thermal observables via a relativistic virial expansion. As an application of the calculation scheme, we compute the correlation of the net baryon number with strangeness ($\chi_{BS}$) for an interacting hadron gas. We show that the S-matrix approach, which entails a consistent treatment of resonances and naturally incorporates the additional hyperon states which are not listed by the Particle Data Group, leads to an improved description of the lattice data over the Hadron Resonance Gas model.
|
2204.02649
|
Hua-Xing Chen
|
Hua-Xing Chen, Wei Chen, Xiang Liu, Yan-Rui Liu, Shi-Lin Zhu
|
An updated review of the new hadron states
|
Review accepted by Reports on Progress in Physics, 179 pages, 87
figures, 15 tables
|
Rept. Prog. Phys. 86 (2023) no.2, 026201
|
10.1088/1361-6633/aca3b6
| null |
hep-ph hep-ex hep-lat nucl-ex nucl-th
|
http://creativecommons.org/licenses/by/4.0/
|
The past decades witnessed the golden era of hadron physics. Many excited
open heavy flavor mesons and baryons have been observed since 2017. We shall
provide an updated review of the recent experimental and theoretical progresses
in this active field. Besides the conventional heavy hadrons, we shall also
review the recently observed open heavy flavor tetraquark states $X(2900)$ and
$T_{cc}^+(3875)$ as well as the hidden heavy flavor multiquark states
$X(6900)$, $P_{cs}(4459)^0$, $Z_{cs}(3985)^-$, $Z_{cs}(4000)^+$, and
$Z_{cs}(4220)^+$. We will also cover the recent progresses on the glueballs and
light hybrid mesons, which are the direct manifestations of the non-Abelian
$SU(3)$ gauge interaction of the Quantum Chromodynamics in the low-energy
region.
|
[
{
"created": "Wed, 6 Apr 2022 08:06:01 GMT",
"version": "v1"
},
{
"created": "Sat, 19 Nov 2022 14:39:20 GMT",
"version": "v2"
}
] |
2022-12-23
|
[
[
"Chen",
"Hua-Xing",
""
],
[
"Chen",
"Wei",
""
],
[
"Liu",
"Xiang",
""
],
[
"Liu",
"Yan-Rui",
""
],
[
"Zhu",
"Shi-Lin",
""
]
] |
The past decades witnessed the golden era of hadron physics. Many excited open heavy flavor mesons and baryons have been observed since 2017. We shall provide an updated review of the recent experimental and theoretical progresses in this active field. Besides the conventional heavy hadrons, we shall also review the recently observed open heavy flavor tetraquark states $X(2900)$ and $T_{cc}^+(3875)$ as well as the hidden heavy flavor multiquark states $X(6900)$, $P_{cs}(4459)^0$, $Z_{cs}(3985)^-$, $Z_{cs}(4000)^+$, and $Z_{cs}(4220)^+$. We will also cover the recent progresses on the glueballs and light hybrid mesons, which are the direct manifestations of the non-Abelian $SU(3)$ gauge interaction of the Quantum Chromodynamics in the low-energy region.
|
0808.1847
|
Robert Thorne S
|
R.S. Thorne, A.D. Martin, W.J. Stirling and G. Watt
|
Parton Distributions and QCD at LHCb
|
4 pages, 7 figures. To appear in the proceedings of the 16th
International Workshop on Deep-Inelastic Scattering and Related Subjects (DIS
2008), London, England, 7-11 April 2008
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider the impact that can be made on our understanding of parton
distributions (PDFs) and QCD from early measurements at the LHCb experiment.
The high rapidity values make the experiment uniquely suited to a detailed
study of small-x parton distributions and hence will make a significant
contribution towards the clarification of both experimental and theoretical
uncertainties on PDFs and their applications.
|
[
{
"created": "Wed, 13 Aug 2008 15:11:42 GMT",
"version": "v1"
}
] |
2008-08-14
|
[
[
"Thorne",
"R. S.",
""
],
[
"Martin",
"A. D.",
""
],
[
"Stirling",
"W. J.",
""
],
[
"Watt",
"G.",
""
]
] |
We consider the impact that can be made on our understanding of parton distributions (PDFs) and QCD from early measurements at the LHCb experiment. The high rapidity values make the experiment uniquely suited to a detailed study of small-x parton distributions and hence will make a significant contribution towards the clarification of both experimental and theoretical uncertainties on PDFs and their applications.
|
1212.5939
|
Apostolos Pilaftsis
|
Amon Ilakovac, Apostolos Pilaftsis and Luka Popov
|
Charged Lepton Flavour Violation in Supersymmetric Low-Scale Seesaw
Models
|
28 pages, 11 figures, comment added to conclusions, version as to
appear in Physical Review D
|
Phys. Rev. D87 (2013) 053014
|
10.1103/PhysRevD.87.053014
|
MAN/HEP/2012/22
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study charged lepton flavour violation in low-scale seesaw models of
minimal supergravity, which realize large neutrino Yukawa couplings thanks to
approximate lepton-number symmetries. There are two dominant sources of lepton
flavour violation in such models. The first source originates from the usual
soft supersymmetry-breaking sector, whilst the second one is entirely
supersymmetric and comes from the supersymmetric neutrino Yukawa sector. Within
the framework of minimal supergravity, we consider both sources of lepton
flavour violation, soft and supersymmetric, and calculate a number of possible
lepton-flavour-violating transitions, such as the photonic decays of muons and
taus, mu -> e gamma, tau -> e gamma and tau -> mu gamma, their neutrinoless
three-body decays, mu -> e e e, tau -> e e e, tau -> mu mu mu, tau -> e e mu
and tau -> e mu mu, and the coherent mu -> e conversion in nuclei. After taking
into account the exclusion bounds placed by present experiments of lepton
flavour violation, we derive combined theoretical limits on the universal heavy
Majorana mass scale mN and the light-to-heavy neutrino mixings. Supersymmetric
low-scale seesaw models offer distinct correlated predictions for
lepton-flavour-violating signatures, which might be discovered in current and
projected experiments, such as MEG, COMET/PRISM, Mu2e, super-BELLE and LHCb.
|
[
{
"created": "Mon, 24 Dec 2012 17:19:35 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Jan 2013 09:12:11 GMT",
"version": "v2"
},
{
"created": "Sun, 13 Jan 2013 16:42:00 GMT",
"version": "v3"
},
{
"created": "Thu, 28 Feb 2013 10:50:01 GMT",
"version": "v4"
}
] |
2013-08-01
|
[
[
"Ilakovac",
"Amon",
""
],
[
"Pilaftsis",
"Apostolos",
""
],
[
"Popov",
"Luka",
""
]
] |
We study charged lepton flavour violation in low-scale seesaw models of minimal supergravity, which realize large neutrino Yukawa couplings thanks to approximate lepton-number symmetries. There are two dominant sources of lepton flavour violation in such models. The first source originates from the usual soft supersymmetry-breaking sector, whilst the second one is entirely supersymmetric and comes from the supersymmetric neutrino Yukawa sector. Within the framework of minimal supergravity, we consider both sources of lepton flavour violation, soft and supersymmetric, and calculate a number of possible lepton-flavour-violating transitions, such as the photonic decays of muons and taus, mu -> e gamma, tau -> e gamma and tau -> mu gamma, their neutrinoless three-body decays, mu -> e e e, tau -> e e e, tau -> mu mu mu, tau -> e e mu and tau -> e mu mu, and the coherent mu -> e conversion in nuclei. After taking into account the exclusion bounds placed by present experiments of lepton flavour violation, we derive combined theoretical limits on the universal heavy Majorana mass scale mN and the light-to-heavy neutrino mixings. Supersymmetric low-scale seesaw models offer distinct correlated predictions for lepton-flavour-violating signatures, which might be discovered in current and projected experiments, such as MEG, COMET/PRISM, Mu2e, super-BELLE and LHCb.
|
hep-ph/9409263
| null |
M.Baillargeon, G. Belanger and F. Boudjema
|
Extracting the Intermediate-Mass Higgs Resonance at Photon-Photon
Colliders
|
39 pages, 14 encaps. figures, ENSLAPP-A-485/94, UdeM-GPP-TH-94-9
LaTeX. Full .ps file available via anonymous ftp at LPSVSH.LPS.UMONTREAL.CA
as [ANONYMOUS.THEORIE.BELANGER]HRESONANCE.PS (1.2 Mb, uncompressed)
|
Phys.Rev. D51 (1995) 4712-4730
|
10.1103/PhysRevD.51.4712
| null |
hep-ph
| null |
We address the problem of how to extract the signal of a Higgs within the
intermediate mass range at a photon-photon collider that has a wide energy
spectrum. All backgrounds from two-jets production are included: direct,
so-called resolved and twice-resolved as well as single $Z$ and $W$ production.
Uncertainties in the evaluation of the QCD-initiated processes such as the
choice of structure function and the issue of radiative corrections are
discussed. We consider various combinations of the polarizations and invariant
mass resolutions as well as jet-tagging strategies with different efficiencies.
The analysis is based on an automatized technique that, given a specific
detector and machine configuration, returns the optimal set of cuts
corresponding to the best significance one may hope to achieve for each
particular Higgs mass. We find that at a photon machine obtained from a 500GeV
\epm\ linear collider with $\int\!{\cal L}=10$~fb$^{-1}$ it will be possible to
extract a Higgs signal in the range 110--140~GeV, while with the same
luminosity, a 350~GeV option not only extends the discovery limit down to
90~GeV but gives much better significance levels.
|
[
{
"created": "Thu, 8 Sep 1994 19:34:04 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Baillargeon",
"M.",
""
],
[
"Belanger",
"G.",
""
],
[
"Boudjema",
"F.",
""
]
] |
We address the problem of how to extract the signal of a Higgs within the intermediate mass range at a photon-photon collider that has a wide energy spectrum. All backgrounds from two-jets production are included: direct, so-called resolved and twice-resolved as well as single $Z$ and $W$ production. Uncertainties in the evaluation of the QCD-initiated processes such as the choice of structure function and the issue of radiative corrections are discussed. We consider various combinations of the polarizations and invariant mass resolutions as well as jet-tagging strategies with different efficiencies. The analysis is based on an automatized technique that, given a specific detector and machine configuration, returns the optimal set of cuts corresponding to the best significance one may hope to achieve for each particular Higgs mass. We find that at a photon machine obtained from a 500GeV \epm\ linear collider with $\int\!{\cal L}=10$~fb$^{-1}$ it will be possible to extract a Higgs signal in the range 110--140~GeV, while with the same luminosity, a 350~GeV option not only extends the discovery limit down to 90~GeV but gives much better significance levels.
|
hep-ph/9408275
| null |
D. Choudhury, F. Eberlein, A. K\"onig, J. Louis, S. Pokorski
|
Constraints on non-universal soft terms from flavor changing neutral
currents
|
15 pages (harvmac) and 5 figures (uuencoded), MPI-PhT/94-51
|
Phys.Lett.B342:180-188,1995
|
10.1016/0370-2693(94)01380-U
| null |
hep-ph
| null |
The smallness of flavor changing neutral currents constrains the soft
parameter space of supersymmetric extensions of the Standard Model. These low
energy constraints are translated to the soft parameter space generated at some
high energy scale $\Mgut$. For gaugino masses larger than the scalar masses and
non-universal $A$-terms the constraints are significantly diluted at $\Mgut$
and do allow for the possibility of non-universal scalar masses. The strongest
constraints arise in the slepton sector of the theory.
|
[
{
"created": "Thu, 11 Aug 1994 19:32:23 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Oct 1994 10:38:35 GMT",
"version": "v2"
}
] |
2010-01-28
|
[
[
"Choudhury",
"D.",
""
],
[
"Eberlein",
"F.",
""
],
[
"König",
"A.",
""
],
[
"Louis",
"J.",
""
],
[
"Pokorski",
"S.",
""
]
] |
The smallness of flavor changing neutral currents constrains the soft parameter space of supersymmetric extensions of the Standard Model. These low energy constraints are translated to the soft parameter space generated at some high energy scale $\Mgut$. For gaugino masses larger than the scalar masses and non-universal $A$-terms the constraints are significantly diluted at $\Mgut$ and do allow for the possibility of non-universal scalar masses. The strongest constraints arise in the slepton sector of the theory.
|
2101.00037
|
Andreas Papaefstathiou
|
Andreas Papaefstathiou, Tania Robens, Gilberto Tetlalmatzi-Xolocotzi
|
Triple Higgs Boson Production at the Large Hadron Collider with Two Real
Singlet Scalars
|
29 pages, 2 figures. Matches published version
|
JHEP 05 (2021) 193
|
10.1007/JHEP05(2021)193
|
SI-HEP-2020-34, RBI-ThPhys-2020-53
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the production of three Higgs bosons in the Two Real Singlet
extension of the Standard Model, where the scalar sector is augmented by two
additional real scalar fields which are singlets under the Standard Model gauge
group. The model contains three neutral CP-even scalars, allowing for resonant
production and asymmetric decay chains. We focus on the signature $p
p\,\rightarrow\,h_3\,\rightarrow\,h_1\,h_2\,\rightarrow\,h_1\,h_1\,h_1$, where
we identify $h_3$ as the heaviest scalar state, $h_2$ as the second heaviest
and the lightest, $h_1$, as the Standard Model-like Higgs boson discovered by
the Large Hadron Collider experiments. The dominant final state occurs when all
three Higgs bosons decay to bottom-anti-bottom quark pairs,
$h_1\,\rightarrow\,b\,\bar{b}$, leading to 6 $b$-jets. Taking into account all
current theoretical and experimental constraints, we determine the discovery
prospects for this channel in future runs of the Large Hadron Collider, as well
as in the high-luminosity phase.
|
[
{
"created": "Thu, 31 Dec 2020 19:07:22 GMT",
"version": "v1"
},
{
"created": "Fri, 28 May 2021 20:39:05 GMT",
"version": "v2"
}
] |
2021-06-01
|
[
[
"Papaefstathiou",
"Andreas",
""
],
[
"Robens",
"Tania",
""
],
[
"Tetlalmatzi-Xolocotzi",
"Gilberto",
""
]
] |
We investigate the production of three Higgs bosons in the Two Real Singlet extension of the Standard Model, where the scalar sector is augmented by two additional real scalar fields which are singlets under the Standard Model gauge group. The model contains three neutral CP-even scalars, allowing for resonant production and asymmetric decay chains. We focus on the signature $p p\,\rightarrow\,h_3\,\rightarrow\,h_1\,h_2\,\rightarrow\,h_1\,h_1\,h_1$, where we identify $h_3$ as the heaviest scalar state, $h_2$ as the second heaviest and the lightest, $h_1$, as the Standard Model-like Higgs boson discovered by the Large Hadron Collider experiments. The dominant final state occurs when all three Higgs bosons decay to bottom-anti-bottom quark pairs, $h_1\,\rightarrow\,b\,\bar{b}$, leading to 6 $b$-jets. Taking into account all current theoretical and experimental constraints, we determine the discovery prospects for this channel in future runs of the Large Hadron Collider, as well as in the high-luminosity phase.
|
hep-ph/0310254
|
Carl Shakin
|
Hu Li, C. M. Shakin, Qing Sun
|
Quark Model Calculations of Spectral Functions of Hadronic Current
Correlation Functions at Finite Temperature
|
14 pages, 5 figures, revtex4
| null | null | null |
hep-ph
| null |
We calculate spectral functions associated with hadronic current correlation
functions for vector and pseudoscalar currents at finite temperature. We make
use of the Nambu--Jona--Lasinio (NJL) model with temperature-dependent coupling
constants and temperature-dependent momentum cutoff parameters. At low
energies, good fits are obtained for the spectral functions that were extracted
from lattice data by means of the maximum entropy method (MEM). Our model has
two parameters which are used to fix the magnitude and position of the large
peak seen in the spectral functions. With those two parameters fixed, we obtain
a satisfactory fit to the width of the peak. The model then also reproduces the
energy of a second peak seen in the spectral functions. In the case of the
pseudoscalar spectral function, the calculated peak is about 20 percent higher
than that found for the spectral function obtained from the lattice data.
However, it appears that the second peak is a lattice artifact [ P. Petreczky,
private communication ] and our fit to the second peak may not be meaningful.
We conclude that the NJL model may have a broader range of application than
previously considered to be the case, if one allows for significant temperature
dependence of the parameters of the model, as well as rather large values of
the momentum cutoff parameter. Our treatment of temperature-dependent coupling
constants and cutoff parameters is analogous to the procedure introduced by R.
Casalbuoni, R. Gatto, G. Nardulli, and M. Ruggieri, [ Phys. Rev. D \textbf{68},
034024 (2003) ], who make use of the NJL model at finite density and find that
they need to use the density-dependent coupling constants and density
-dependent cutoff parameters to study matter at high density.
|
[
{
"created": "Tue, 21 Oct 2003 15:21:52 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Li",
"Hu",
""
],
[
"Shakin",
"C. M.",
""
],
[
"Sun",
"Qing",
""
]
] |
We calculate spectral functions associated with hadronic current correlation functions for vector and pseudoscalar currents at finite temperature. We make use of the Nambu--Jona--Lasinio (NJL) model with temperature-dependent coupling constants and temperature-dependent momentum cutoff parameters. At low energies, good fits are obtained for the spectral functions that were extracted from lattice data by means of the maximum entropy method (MEM). Our model has two parameters which are used to fix the magnitude and position of the large peak seen in the spectral functions. With those two parameters fixed, we obtain a satisfactory fit to the width of the peak. The model then also reproduces the energy of a second peak seen in the spectral functions. In the case of the pseudoscalar spectral function, the calculated peak is about 20 percent higher than that found for the spectral function obtained from the lattice data. However, it appears that the second peak is a lattice artifact [ P. Petreczky, private communication ] and our fit to the second peak may not be meaningful. We conclude that the NJL model may have a broader range of application than previously considered to be the case, if one allows for significant temperature dependence of the parameters of the model, as well as rather large values of the momentum cutoff parameter. Our treatment of temperature-dependent coupling constants and cutoff parameters is analogous to the procedure introduced by R. Casalbuoni, R. Gatto, G. Nardulli, and M. Ruggieri, [ Phys. Rev. D \textbf{68}, 034024 (2003) ], who make use of the NJL model at finite density and find that they need to use the density-dependent coupling constants and density -dependent cutoff parameters to study matter at high density.
|
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