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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1602.07234
|
Jacopo Fumagalli
|
Jacopo Fumagalli and Marieke Postma
|
UV (in)sensitivity of Higgs inflation
|
30 pages, 3 figures
| null |
10.1007/JHEP05(2016)049
| null |
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The predictions of Standard Model Higgs inflation are in excellent agreement
with the Planck data, without the need for new fields. However, consistency of
the theory requires the presence of (unknown) threshold corrections. These
modify the running of the couplings, and thereby change the shape of the
inflationary potential. This raises the question how sensitive the CMB
parameters are to the UV completion. We show that, due to a precise
cancellation, the inflationary predictions are almost unaffected. This implies
in general that one cannot relate the spectral index and tensor-to-scalar ratio
to the precise top and Higgs mass measurements at the LHC, nor can one probe
effects of UV physics on the running.
|
[
{
"created": "Tue, 23 Feb 2016 17:00:15 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Apr 2016 02:01:13 GMT",
"version": "v2"
}
] |
2017-03-15
|
[
[
"Fumagalli",
"Jacopo",
""
],
[
"Postma",
"Marieke",
""
]
] |
The predictions of Standard Model Higgs inflation are in excellent agreement with the Planck data, without the need for new fields. However, consistency of the theory requires the presence of (unknown) threshold corrections. These modify the running of the couplings, and thereby change the shape of the inflationary potential. This raises the question how sensitive the CMB parameters are to the UV completion. We show that, due to a precise cancellation, the inflationary predictions are almost unaffected. This implies in general that one cannot relate the spectral index and tensor-to-scalar ratio to the precise top and Higgs mass measurements at the LHC, nor can one probe effects of UV physics on the running.
|
hep-ph/0508202
|
John F. Beacom
|
John F. Beacom, Louis E. Strigari (Ohio State University)
|
New Test of Supernova Electron Neutrino Emission using Sudbury Neutrino
Observatory Sensitivity to the Diffuse Supernova Neutrino Background
|
10 pages, 3 figures
|
Phys.Rev. C73 (2006) 035807
|
10.1103/PhysRevC.73.035807
| null |
hep-ph astro-ph nucl-th
| null |
Supernovae are rare nearby, but they are not rare in the Universe, and all
past core-collapse supernovae contributed to the Diffuse Supernova Neutrino
Background (DSNB), for which the near-term detection prospects are very good.
The Super-Kamiokande limit on the DSNB electron {\it antineutrino} flux,
$\phi(E_\nu > 19.3 {\rm MeV}) < 1.2$ cm$^{-2}$ s$^{-1}$, is just above the
range of recent theoretical predictions based on the measured star formation
rate history. We show that the Sudbury Neutrino Observatory should be able to
test the corresponding DSNB electron {\it neutrino} flux with a sensitivity as
low as $\phi(22.5 < E_\nu < 32.5 {\rm MeV}) \simeq 6 $ cm$^{-2}$ s$^{-1}$,
improving the existing Mont Blanc limit by about three orders of magnitude.
While conventional supernova models predict comparable electron neutrino and
antineutrino fluxes, it is often considered that the first (and
forward-directed) SN 1987A event in the Kamiokande-II detector should be
attributed to electron-neutrino scattering with an electron, which would
require a substantially enhanced electron neutrino flux. We show that with the
required enhancements in either the burst or thermal phase $\nu_e$ fluxes, the
DSNB electron neutrino flux would generally be detectable in the Sudbury
Neutrino Observatory. A direct experimental test could then resolve one of the
enduring mysteries of SN 1987A: whether the first Kamiokande-II event reveals a
serious misunderstanding of supernova physics, or was simply an unlikely
statistical fluctuation. Thus the electron neutrino sensitivity of the Sudbury
Neutrino Observatory is an important complement to the electron antineutrino
sensitivity of Super-Kamiokande in the quest to understand the DSNB.
|
[
{
"created": "Thu, 18 Aug 2005 20:03:21 GMT",
"version": "v1"
}
] |
2009-11-11
|
[
[
"Beacom",
"John F.",
"",
"Ohio State University"
],
[
"Strigari",
"Louis E.",
"",
"Ohio State University"
]
] |
Supernovae are rare nearby, but they are not rare in the Universe, and all past core-collapse supernovae contributed to the Diffuse Supernova Neutrino Background (DSNB), for which the near-term detection prospects are very good. The Super-Kamiokande limit on the DSNB electron {\it antineutrino} flux, $\phi(E_\nu > 19.3 {\rm MeV}) < 1.2$ cm$^{-2}$ s$^{-1}$, is just above the range of recent theoretical predictions based on the measured star formation rate history. We show that the Sudbury Neutrino Observatory should be able to test the corresponding DSNB electron {\it neutrino} flux with a sensitivity as low as $\phi(22.5 < E_\nu < 32.5 {\rm MeV}) \simeq 6 $ cm$^{-2}$ s$^{-1}$, improving the existing Mont Blanc limit by about three orders of magnitude. While conventional supernova models predict comparable electron neutrino and antineutrino fluxes, it is often considered that the first (and forward-directed) SN 1987A event in the Kamiokande-II detector should be attributed to electron-neutrino scattering with an electron, which would require a substantially enhanced electron neutrino flux. We show that with the required enhancements in either the burst or thermal phase $\nu_e$ fluxes, the DSNB electron neutrino flux would generally be detectable in the Sudbury Neutrino Observatory. A direct experimental test could then resolve one of the enduring mysteries of SN 1987A: whether the first Kamiokande-II event reveals a serious misunderstanding of supernova physics, or was simply an unlikely statistical fluctuation. Thus the electron neutrino sensitivity of the Sudbury Neutrino Observatory is an important complement to the electron antineutrino sensitivity of Super-Kamiokande in the quest to understand the DSNB.
|
1308.0533
|
Zhi-Gang Wang
|
Zhi-Gang Wang
|
Analysis of strong decays of the charmed mesons $D_J(2580)$,
$D_J^*(2650)$, $D_J(2740)$, $D^*_J(2760)$, $D_J(3000)$, $D_J^*(3000)$
|
16 pages
|
Phys.Rev.D88 (2013) 114003
|
10.1103/PhysRevD.88.114003
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this article, we tentatively identify the charmed mesons $D_J(2580)$,
$D_J^*(2650)$, $D_J(2740)$, $D^*_J(2760)$, $D_J(3000)$, $D_J^*(3000)$ observed
by the LHCb collaboration according to their spin, parity and masses, then
study their strong decays to the ground state charmed mesons plus light
pseudoscalar mesons with the heavy meson effective theory in the leading order
approximation, and obtain explicit expressions of the decay widths. The ratios
among the decay widths can be used to confirm or reject the assignments of the
newly observed charmed mesons. The strong coupling constants in the decay
widths can be fitted to the experimental data in the future at the LHCb,
BESIII, KEK-B and $\rm{\bar{P}ANDA}$.
|
[
{
"created": "Fri, 2 Aug 2013 15:24:58 GMT",
"version": "v1"
},
{
"created": "Sat, 14 Sep 2013 02:38:43 GMT",
"version": "v2"
}
] |
2013-12-10
|
[
[
"Wang",
"Zhi-Gang",
""
]
] |
In this article, we tentatively identify the charmed mesons $D_J(2580)$, $D_J^*(2650)$, $D_J(2740)$, $D^*_J(2760)$, $D_J(3000)$, $D_J^*(3000)$ observed by the LHCb collaboration according to their spin, parity and masses, then study their strong decays to the ground state charmed mesons plus light pseudoscalar mesons with the heavy meson effective theory in the leading order approximation, and obtain explicit expressions of the decay widths. The ratios among the decay widths can be used to confirm or reject the assignments of the newly observed charmed mesons. The strong coupling constants in the decay widths can be fitted to the experimental data in the future at the LHCb, BESIII, KEK-B and $\rm{\bar{P}ANDA}$.
|
1908.11734
|
Nicolas Chanon
|
N. Chanon, A. Carle, and S. Perries
|
Prospects for Lorentz-Violation Searches at the LHC and Future Colliders
|
Presented at the Eighth Meeting on CPT and Lorentz Symmetry,
Bloomington, Indiana, May 12-16, 2019
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Hadron colliders are providing a unique opportunity for testing Lorentz
invariance and CPT symmetry at high energy and in a laboratory. A first
measurement in the top-quark sector was performed at the Tevatron. We present
here prospective studies for testing Lorentz invariance in top-quark pair
production at the LHC and future colliders. The b-quark sector was investigated
recently at LHCb. Eventually, new bounds on photon parameters can be extracted
from the observation of TeV photons at the LHC. We will conclude by
highlighting other opportunities provided by hadron colliders.
|
[
{
"created": "Fri, 30 Aug 2019 13:40:57 GMT",
"version": "v1"
}
] |
2019-09-02
|
[
[
"Chanon",
"N.",
""
],
[
"Carle",
"A.",
""
],
[
"Perries",
"S.",
""
]
] |
Hadron colliders are providing a unique opportunity for testing Lorentz invariance and CPT symmetry at high energy and in a laboratory. A first measurement in the top-quark sector was performed at the Tevatron. We present here prospective studies for testing Lorentz invariance in top-quark pair production at the LHC and future colliders. The b-quark sector was investigated recently at LHCb. Eventually, new bounds on photon parameters can be extracted from the observation of TeV photons at the LHC. We will conclude by highlighting other opportunities provided by hadron colliders.
|
hep-ph/0612251
|
Jose W. F. Valle
|
Jose W. F. Valle
|
Concluding talk at NOW 2006
|
10 pages, 13 figures, Concluding talk at Neutrino Oscillation
Workshop, Conca Specchiulla (Otranto, Lecce, Italy) September 9-16, 2006. To
appear in proceedings
|
Nucl.Phys.Proc.Suppl.168:413-422,2007
|
10.1016/j.nuclphysbps.2007.02.096
|
IFIC/06-XX
|
hep-ph
| null |
This writeup summarizes the status of neutrino oscillations, including recent
fluxes and experimental data, as of summer 2006. A discussion is given on the
current status of absolute scale of neutrino mass from tritium, neutrinoless
double beta decay and cosmological observations, as well as the prospects for
the next generation of experiments, including lepton flavor violation searches,
and their theoretical significance.
|
[
{
"created": "Wed, 20 Dec 2006 19:11:58 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Valle",
"Jose W. F.",
""
]
] |
This writeup summarizes the status of neutrino oscillations, including recent fluxes and experimental data, as of summer 2006. A discussion is given on the current status of absolute scale of neutrino mass from tritium, neutrinoless double beta decay and cosmological observations, as well as the prospects for the next generation of experiments, including lepton flavor violation searches, and their theoretical significance.
|
2202.13153
|
Vasileios Vatellis
|
Pedro M. Ferreira, Felipe F. Freitas, Jo\~ao Gon\c{c}alves, Ant\'onio
P. Morais, Roman Pasechnik, Vasileios Vatellis
|
Phenomenology of a flavoured multiscalar BGL-like model with three
generations of massive neutrinos
|
32 pages, 9 Figures and 7 tables. Matches version to be published in
PRD
| null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
In this paper, we present several possible anomaly-free implementations of
the Branco-Grimus-Lavoura (BGL) model with two Higgs doublets and one singlet
scalar. The model also includes three generations of massive neutrinos that get
their mass via a type-I seesaw mechanism. A particular anomaly-free
realization, which we dub $\nu$BGL-1 scenario, is subjected to an extensive
phenomenological analysis, from the perspective of flavour physics and collider
phenomenology.
|
[
{
"created": "Sat, 26 Feb 2022 14:56:45 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Sep 2022 13:53:43 GMT",
"version": "v2"
}
] |
2022-09-29
|
[
[
"Ferreira",
"Pedro M.",
""
],
[
"Freitas",
"Felipe F.",
""
],
[
"Gonçalves",
"João",
""
],
[
"Morais",
"António P.",
""
],
[
"Pasechnik",
"Roman",
""
],
[
"Vatellis",
"Vasileios",
""
]
] |
In this paper, we present several possible anomaly-free implementations of the Branco-Grimus-Lavoura (BGL) model with two Higgs doublets and one singlet scalar. The model also includes three generations of massive neutrinos that get their mass via a type-I seesaw mechanism. A particular anomaly-free realization, which we dub $\nu$BGL-1 scenario, is subjected to an extensive phenomenological analysis, from the perspective of flavour physics and collider phenomenology.
|
hep-ph/0305092
|
Ricardo Gonzalez Felipe
|
G.C. Branco, J.-M. Gerard, R. Gonzalez Felipe, B.M. Nobre
|
Polychromatic Grand Unification
|
4 pages, 2 figures
| null | null |
UCL-IPT-03-09
|
hep-ph hep-th
| null |
The possibility of achieving a gauge coupling grand unification by increasing
the QCD degrees of freedom at higher energies is investigated. When confronted
with precision low-energy data, the generic weak-mixing angle relation
sin^2(theta_W) = N/2(N+1) requires N=7 colors at the GUT scale M_U ~ 10^17 GeV.
With the exclusive addition of light Higgs doublets to the standard model
particle content, such a unification may also occur if N=5 at M_U ~ 10^16 GeV.
|
[
{
"created": "Thu, 8 May 2003 19:06:12 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Branco",
"G. C.",
""
],
[
"Gerard",
"J. -M.",
""
],
[
"Felipe",
"R. Gonzalez",
""
],
[
"Nobre",
"B. M.",
""
]
] |
The possibility of achieving a gauge coupling grand unification by increasing the QCD degrees of freedom at higher energies is investigated. When confronted with precision low-energy data, the generic weak-mixing angle relation sin^2(theta_W) = N/2(N+1) requires N=7 colors at the GUT scale M_U ~ 10^17 GeV. With the exclusive addition of light Higgs doublets to the standard model particle content, such a unification may also occur if N=5 at M_U ~ 10^16 GeV.
|
hep-ph/0601094
|
Paride Paradisi
|
G.Isidori, P.Paradisi
|
Higgs--mediated K -> pi nu nu-bar in the MSSM at large tan(beta)
|
9 pages, 2 figures
|
Phys.Rev. D73 (2006) 055017
|
10.1103/PhysRevD.73.055017
| null |
hep-ph
| null |
We analyze the impact of Higgs-mediated amplitudes on the rare decays KL ->
pi0 nu nu-bar and K+ -> pi+ nu nu-bar in the MSSM with large tan(beta) and
general flavour mixing. We point out that, going beyond the minimal flavour
violation hypothesis, Z-penguin amplitudes generated by charged-Higgs exchange
can induce sizable modifications of K -> pi nu nu-bar rates. Interestingly,
these effects scale as tan^4(beta) at the amplitude level. For large values of
tan(beta), this mechanism allows deviations from the SM expectations even for
tiny (CKM-type) off-diagonal mixing terms in the right-handed squark sector.
|
[
{
"created": "Thu, 12 Jan 2006 10:51:14 GMT",
"version": "v1"
}
] |
2009-11-11
|
[
[
"Isidori",
"G.",
""
],
[
"Paradisi",
"P.",
""
]
] |
We analyze the impact of Higgs-mediated amplitudes on the rare decays KL -> pi0 nu nu-bar and K+ -> pi+ nu nu-bar in the MSSM with large tan(beta) and general flavour mixing. We point out that, going beyond the minimal flavour violation hypothesis, Z-penguin amplitudes generated by charged-Higgs exchange can induce sizable modifications of K -> pi nu nu-bar rates. Interestingly, these effects scale as tan^4(beta) at the amplitude level. For large values of tan(beta), this mechanism allows deviations from the SM expectations even for tiny (CKM-type) off-diagonal mixing terms in the right-handed squark sector.
|
hep-ph/9910205
|
H. V.-Klapdor-Kleingrothaus
|
H. V. Klapdor-Kleingrothaus, L. Baudis, G. Heusser, B. Majorovits, H.
Paes
|
GENIUS - a Supersensitive Germanium Detector System for Rare Events
|
102 pages, 62 figures (colour versions of some of the pictures can be
obtained from the authors), minor changes
| null | null |
MPI-Report MPI-H-V26-1999
|
hep-ph hep-ex
| null |
To increase by a major step the present sensitivity for dark matter and
double beta decay search, a new project is suggested, which would operate
'naked' GErmanium detectors in liquid NItrogen as shielding in an Underground
Setup (GENIUS). In a first step using 100 kg of natural Ge a large part of the
MSSM parameter space for prediction of neutralinos as cold dark matter will be
covered making the experiment complementary to LHC in the search for
supersymmetry. In the second step use of one ton of enriched 76Ge would yield a
sensitivity for double beta decay for the effective Majorana neutrino mass of
\0.01 eV. This would be a breakthrough for neutrino physics. GENIUS would also
be a breakthrough into the multi-TeV range for many other beyond standard
models currently discussed, and the sensitivity would be comparable or even
superior to LHC or NLC for various quantities such as right-handed W boson
mass, R-parity violation, leptoquark or compositeness searches, or left-handed
heavy neutrinos.
|
[
{
"created": "Fri, 1 Oct 1999 17:20:41 GMT",
"version": "v1"
},
{
"created": "Wed, 3 Nov 1999 01:18:12 GMT",
"version": "v2"
},
{
"created": "Fri, 31 Mar 2000 16:31:40 GMT",
"version": "v3"
},
{
"created": "Thu, 29 Jun 2000 16:52:06 GMT",
"version": "v4"
}
] |
2007-05-23
|
[
[
"Klapdor-Kleingrothaus",
"H. V.",
""
],
[
"Baudis",
"L.",
""
],
[
"Heusser",
"G.",
""
],
[
"Majorovits",
"B.",
""
],
[
"Paes",
"H.",
""
]
] |
To increase by a major step the present sensitivity for dark matter and double beta decay search, a new project is suggested, which would operate 'naked' GErmanium detectors in liquid NItrogen as shielding in an Underground Setup (GENIUS). In a first step using 100 kg of natural Ge a large part of the MSSM parameter space for prediction of neutralinos as cold dark matter will be covered making the experiment complementary to LHC in the search for supersymmetry. In the second step use of one ton of enriched 76Ge would yield a sensitivity for double beta decay for the effective Majorana neutrino mass of \0.01 eV. This would be a breakthrough for neutrino physics. GENIUS would also be a breakthrough into the multi-TeV range for many other beyond standard models currently discussed, and the sensitivity would be comparable or even superior to LHC or NLC for various quantities such as right-handed W boson mass, R-parity violation, leptoquark or compositeness searches, or left-handed heavy neutrinos.
|
1912.11795
|
Ya-Juan Zheng
|
Vernon Barger, Kaoru Hagiwara and Ya-Juan Zheng
|
Probing the top Yukawa coupling at the LHC via associated production of
single top and Higgs
|
31 pages, 19 figures and 2 tables; references added
| null |
10.1007/JHEP09(2020)101
|
KEK-TH-2175
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study Higgs boson production associated with single top or anti-top via
$t$-channel weak boson exchange at the LHC. The process is an ideal probe of
the top quark Yukawa coupling, because we can measure the relative phase of
$htt$ and $hWW$ couplings, thanks to the significant interference between the
two amplitudes. By choosing the emitted $W$ momentum along the polar axis in
the $th\,(\bar{t}h)$ rest frame, we obtain the helicity amplitudes for all the
contributing subprocesses analytically, with possible CP phase of the Yukawa
coupling. We study the azimuthal asymmetry between the $W$ emission and the
$Wb\,(\bar{b})\to t(\bar{t})\,h$ scattering planes, as well as several $t$ and
$\bar{t}$ polarization asymmetries as a signal of CP violating phase in the
$htt$ coupling. Both the azimuthal asymmetry and the polarization perpendicular
to the scattering plane are found to have the opposite sign between the top and
anti-top events. We identify the origin of the sign of asymmetries, and propose
the possibility of direct CP violation test in $pp$ collisions by comparing the
top and anti-top polarization at the LHC.
|
[
{
"created": "Thu, 26 Dec 2019 07:49:08 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Jan 2020 18:24:06 GMT",
"version": "v2"
}
] |
2020-10-28
|
[
[
"Barger",
"Vernon",
""
],
[
"Hagiwara",
"Kaoru",
""
],
[
"Zheng",
"Ya-Juan",
""
]
] |
We study Higgs boson production associated with single top or anti-top via $t$-channel weak boson exchange at the LHC. The process is an ideal probe of the top quark Yukawa coupling, because we can measure the relative phase of $htt$ and $hWW$ couplings, thanks to the significant interference between the two amplitudes. By choosing the emitted $W$ momentum along the polar axis in the $th\,(\bar{t}h)$ rest frame, we obtain the helicity amplitudes for all the contributing subprocesses analytically, with possible CP phase of the Yukawa coupling. We study the azimuthal asymmetry between the $W$ emission and the $Wb\,(\bar{b})\to t(\bar{t})\,h$ scattering planes, as well as several $t$ and $\bar{t}$ polarization asymmetries as a signal of CP violating phase in the $htt$ coupling. Both the azimuthal asymmetry and the polarization perpendicular to the scattering plane are found to have the opposite sign between the top and anti-top events. We identify the origin of the sign of asymmetries, and propose the possibility of direct CP violation test in $pp$ collisions by comparing the top and anti-top polarization at the LHC.
|
hep-ph/9409385
| null |
Ulf-G. Mei{\ss}ner
|
Applied Chiral Perturbation Theory
|
19 pp, TeX, Invited lecture, Summer School on "Hadronic Aspects of
Collider Physics", Zuoz, Switzerland, August 1994. 3 figs. available upon
request. CRN--94/53
| null | null | null |
hep-ph nucl-th
| null |
I consider some selected topics in chiral perturbation theory (CHPT) as
probed at colliders such as DA$\Phi$NE. Emphasis is put on processes involving
pions in the isospin zero S-wave which require multi-loop calculations. These
include the scalar form factor of the pion, two--photon fusion into pion pairs
and $K_{\ell 4}$--decays. The physics of the chiral anomaly is briefly touched
upon
|
[
{
"created": "Thu, 22 Sep 1994 07:50:35 GMT",
"version": "v1"
}
] |
2009-09-25
|
[
[
"Meißner",
"Ulf-G.",
""
]
] |
I consider some selected topics in chiral perturbation theory (CHPT) as probed at colliders such as DA$\Phi$NE. Emphasis is put on processes involving pions in the isospin zero S-wave which require multi-loop calculations. These include the scalar form factor of the pion, two--photon fusion into pion pairs and $K_{\ell 4}$--decays. The physics of the chiral anomaly is briefly touched upon
|
hep-ph/9905318
|
Richard Rittel
|
C. Boros, Meng Ta-chung, R. Rittel, K. Tabelow, and Zhang Yang
|
Formation of color-singlet gluon-clusters and inelastic diffractive
scattering
|
67 pages, including 11 figures
|
Phys.Rev. D61 (2000) 094010
|
10.1103/PhysRevD.61.094010
| null |
hep-ph
| null |
This is the extensive follow-up report of a recent Letter in which the
existence of self-organized criticality (SOC) in systems of interacting soft
gluons is proposed, and its consequences for inelastic diffractive scattering
processes are discussed. It is pointed out, that color-singlet gluon-clusters
can be formed in hadrons as a consequence of SOC in systems of interacting soft
gluons, and that the properties of such spatiotemporal complexities can be
probed experimentally by examing inelastic diffractive scattering. Theoretical
arguments and experimental evidences supporting the proposed picture are
presented --- together with the result of a systematic analysis of the existing
data for inelastic diffractive scattering processes performed at different
incident energies, and/or by using different beam-particles. It is shown in
particular that the size- and the lifetime-distributions of such gluon-clusters
can be directly extracted from the data, and the obtained results exhibit
universal power-law behaviors --- in accordance with the expected
SOC-fingerprints. As further consequences of SOC in systems of interacting soft
gluons, the $t$-dependence and the $(M_x^2/s)$-dependence of the double
differential cross-sections for inelastic diffractive scattering off
proton-target are discussed. Here $t$ stands for the four-momentum-transfer
squared, $M_x$ for the missing mass, and $\sqrt{s}$ for the total c.m.s.
energy. It is shown, that the space-time properties of the color-singlet
gluon-clusters due to SOC, discussed above, lead to simple analytical formulae
for $d^2\sigma/dt d(M_x^2/s)$ and for $d\sigma/dt$, and that the obtained
results are in good agreement with the existing data. Further experiments are
suggested.
|
[
{
"created": "Wed, 12 May 1999 12:11:22 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Dec 1999 19:02:23 GMT",
"version": "v2"
}
] |
2009-10-31
|
[
[
"Boros",
"C.",
""
],
[
"Ta-chung",
"Meng",
""
],
[
"Rittel",
"R.",
""
],
[
"Tabelow",
"K.",
""
],
[
"Yang",
"Zhang",
""
]
] |
This is the extensive follow-up report of a recent Letter in which the existence of self-organized criticality (SOC) in systems of interacting soft gluons is proposed, and its consequences for inelastic diffractive scattering processes are discussed. It is pointed out, that color-singlet gluon-clusters can be formed in hadrons as a consequence of SOC in systems of interacting soft gluons, and that the properties of such spatiotemporal complexities can be probed experimentally by examing inelastic diffractive scattering. Theoretical arguments and experimental evidences supporting the proposed picture are presented --- together with the result of a systematic analysis of the existing data for inelastic diffractive scattering processes performed at different incident energies, and/or by using different beam-particles. It is shown in particular that the size- and the lifetime-distributions of such gluon-clusters can be directly extracted from the data, and the obtained results exhibit universal power-law behaviors --- in accordance with the expected SOC-fingerprints. As further consequences of SOC in systems of interacting soft gluons, the $t$-dependence and the $(M_x^2/s)$-dependence of the double differential cross-sections for inelastic diffractive scattering off proton-target are discussed. Here $t$ stands for the four-momentum-transfer squared, $M_x$ for the missing mass, and $\sqrt{s}$ for the total c.m.s. energy. It is shown, that the space-time properties of the color-singlet gluon-clusters due to SOC, discussed above, lead to simple analytical formulae for $d^2\sigma/dt d(M_x^2/s)$ and for $d\sigma/dt$, and that the obtained results are in good agreement with the existing data. Further experiments are suggested.
|
hep-ph/0312173
|
Geoffrey T. Bodwin
|
Geoffrey T. Bodwin
|
Inclusive quarkonium production and the NRQCD factorization approach
|
6 pages, RevTeX, 7 Postscript figures, talk presented at the Second
International Conference on Flavor Physics, Seoul, South Korea, 6--11
October, 2003, minor corrections
|
J.Korean Phys.Soc.45:S306-S312,2004
| null |
ANL-HEP-CP-03-113
|
hep-ph
| null |
I discuss the current status of the comparison between quarkonium-production
measurements and the predictions of the NRQCD factorization formalism.
|
[
{
"created": "Sun, 14 Dec 2003 19:13:55 GMT",
"version": "v1"
},
{
"created": "Wed, 1 Dec 2004 22:49:41 GMT",
"version": "v2"
}
] |
2014-11-17
|
[
[
"Bodwin",
"Geoffrey T.",
""
]
] |
I discuss the current status of the comparison between quarkonium-production measurements and the predictions of the NRQCD factorization formalism.
|
hep-ph/9407385
|
Masahiro Yamaguchi
|
Izumi Joichi, Yoshiharu Kawamura and Masahiro Yamaguchi
|
Stability of Gauge Hierarchy in Einstein Supergravity
| null | null | null | null |
hep-ph
| null |
In supersymmetric grand unified theories, the gauge hierarchy achieved by a
fine-tuning in the superpotential can be violated in the presence of soft
breaking terms. We examine this problem in Einstein supergravity with
hidden-sector supersymmetry breaking. We show that the hierarchy is preserved
if couplings of the hidden sector to visible-sector fields in the
superpotential satisfy a certain requirement.
|
[
{
"created": "Wed, 27 Jul 1994 04:58:30 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Joichi",
"Izumi",
""
],
[
"Kawamura",
"Yoshiharu",
""
],
[
"Yamaguchi",
"Masahiro",
""
]
] |
In supersymmetric grand unified theories, the gauge hierarchy achieved by a fine-tuning in the superpotential can be violated in the presence of soft breaking terms. We examine this problem in Einstein supergravity with hidden-sector supersymmetry breaking. We show that the hierarchy is preserved if couplings of the hidden sector to visible-sector fields in the superpotential satisfy a certain requirement.
|
2208.03329
|
Jo\~ao Tiago Neves Penedo
|
J. T. Penedo, Yakefu Reyimuaji, Xinyi Zhang
|
Axionic Dirac seesaw and electroweak vacuum stability
|
25 pages, 4 figures, 2 tables
| null |
10.1103/PhysRevD.106.115035
|
CFTP/22-005
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We explore the connection between tree-level Dirac neutrino masses and axion
physics in a scenario where the PQ symmetry enforces lepton number conservation
perturbatively. Requiring that the PQ scale $f_a$ is the only heavy scale to
play a role in neutrino mass generation, we are led to the construction of a
KSVZ-type model where Dirac neutrino masses are inversely proportional to
$f_a$, provided a real scalar triplet (zero hypercharge) is added to the SM
scalar sector. We analyse this extended scalar sector, focusing on the
stabilisation of the electroweak vacuum. The contribution of the triplet VEV to
the $W$ mass may also be responsible for the recent hint of beyond-the-SM
physics by the CDF collaboration.
|
[
{
"created": "Fri, 5 Aug 2022 18:00:01 GMT",
"version": "v1"
}
] |
2023-01-11
|
[
[
"Penedo",
"J. T.",
""
],
[
"Reyimuaji",
"Yakefu",
""
],
[
"Zhang",
"Xinyi",
""
]
] |
We explore the connection between tree-level Dirac neutrino masses and axion physics in a scenario where the PQ symmetry enforces lepton number conservation perturbatively. Requiring that the PQ scale $f_a$ is the only heavy scale to play a role in neutrino mass generation, we are led to the construction of a KSVZ-type model where Dirac neutrino masses are inversely proportional to $f_a$, provided a real scalar triplet (zero hypercharge) is added to the SM scalar sector. We analyse this extended scalar sector, focusing on the stabilisation of the electroweak vacuum. The contribution of the triplet VEV to the $W$ mass may also be responsible for the recent hint of beyond-the-SM physics by the CDF collaboration.
|
0808.0497
|
Luis Anchordoqui
|
Luis A Anchordoqui, Haim Goldberg, Dieter Lust, Satoshi Nawata,
Stephan Stieberger, and Tomasz R. Taylor
|
Dijet signals for low mass strings at the LHC
|
v2 contains discussion on dijet angular distributions. To be
published in Physical Review Letters; v3 typographical error in equations
(8), (9), (10), and (11) has been corrected
|
Phys.Rev.Lett.101:241803,2008
|
10.1103/PhysRevLett.101.241803
|
MPP-2008-86, LMU-ASC 42/08, NUB-3262-Th-08
|
hep-ph hep-ex hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider extensions of the standard model based on open strings ending on
D-branes, with gauge bosons due to strings attached to stacks of D-branes and
chiral matter due to strings stretching between intersecting D-branes. Assuming
that the fundamental string mass scale is in the TeV range and the theory is
weakly coupled, we discuss possible signals of string physics at the Large
Hadron Collider (LHC). In such D-brane constructions, the dominant
contributions to full-fledged string amplitudes for all the common QCD parton
subprocesses leading to dijets are completely independent of the details of
compactification, and can be evaluated in a parameter-free manner. We make use
of these amplitudes evaluated near the first resonant pole to determine the
discovery potential of LHC for the first Regge excitations of the quark and
gluon. Remarkably, the reach of LHC after a few years of running can be as high
as 6.8 TeV. Even after the first 100 pb^{-1} of integrated luminosity, string
scales as high as 4.0 TeV can be discovered. For string scales as high as 5.0
TeV, observations of resonant structures in pp \to {\rm direct} \gamma + jet
can provide interesting corroboration for string physics at the TeV-scale.
|
[
{
"created": "Mon, 4 Aug 2008 20:55:07 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Nov 2008 21:28:00 GMT",
"version": "v2"
},
{
"created": "Wed, 30 Jun 2010 14:16:43 GMT",
"version": "v3"
}
] |
2010-07-01
|
[
[
"Anchordoqui",
"Luis A",
""
],
[
"Goldberg",
"Haim",
""
],
[
"Lust",
"Dieter",
""
],
[
"Nawata",
"Satoshi",
""
],
[
"Stieberger",
"Stephan",
""
],
[
"Taylor",
"Tomasz R.",
""
]
] |
We consider extensions of the standard model based on open strings ending on D-branes, with gauge bosons due to strings attached to stacks of D-branes and chiral matter due to strings stretching between intersecting D-branes. Assuming that the fundamental string mass scale is in the TeV range and the theory is weakly coupled, we discuss possible signals of string physics at the Large Hadron Collider (LHC). In such D-brane constructions, the dominant contributions to full-fledged string amplitudes for all the common QCD parton subprocesses leading to dijets are completely independent of the details of compactification, and can be evaluated in a parameter-free manner. We make use of these amplitudes evaluated near the first resonant pole to determine the discovery potential of LHC for the first Regge excitations of the quark and gluon. Remarkably, the reach of LHC after a few years of running can be as high as 6.8 TeV. Even after the first 100 pb^{-1} of integrated luminosity, string scales as high as 4.0 TeV can be discovered. For string scales as high as 5.0 TeV, observations of resonant structures in pp \to {\rm direct} \gamma + jet can provide interesting corroboration for string physics at the TeV-scale.
|
2305.01685
|
Benoit Assi
|
Beno\^it Assi and Michael L. Wagman
|
Baryons, multi-hadron systems, and composite dark matter in
non-relativistic QCD
|
39 pages, 24 figures
| null |
10.1103/PhysRevD.108.096004
|
FERMILAB-PUB-23-127-T
|
hep-ph hep-lat nucl-th
|
http://creativecommons.org/licenses/by/4.0/
|
We provide a formulation of potential non-relativistic quantum chromodynamics
(pNRQCD) suitable for calculating binding energies and matrix elements of
generic hadron and multi-hadron states made of heavy quarks in $SU(N_c)$ gauge
theory using quantum Monte Carlo techniques. We compute masses of quarkonium
and triply-heavy baryons in order to study the perturbative convergence of
pNRQCD and validate our numerical methods. Further, we study $SU(N_c)$ models
of composite dark matter and provide simple power series fits to our pNRQCD
results that can be used to relate dark meson and baryon masses to the
fundamental parameters of these models. For many systems comprised entirely of
heavy quarks, the quantum Monte Carlo methods employed here are less
computationally demanding than lattice field theory methods, although they
introduce additional perturbative approximations. The formalism presented here
may therefore be particularly useful for predicting composite dark matter
properties for a wide range of $N_c$ and heavy fermion masses.
|
[
{
"created": "Tue, 2 May 2023 18:00:05 GMT",
"version": "v1"
},
{
"created": "Fri, 3 Nov 2023 15:08:06 GMT",
"version": "v2"
}
] |
2023-11-06
|
[
[
"Assi",
"Benoît",
""
],
[
"Wagman",
"Michael L.",
""
]
] |
We provide a formulation of potential non-relativistic quantum chromodynamics (pNRQCD) suitable for calculating binding energies and matrix elements of generic hadron and multi-hadron states made of heavy quarks in $SU(N_c)$ gauge theory using quantum Monte Carlo techniques. We compute masses of quarkonium and triply-heavy baryons in order to study the perturbative convergence of pNRQCD and validate our numerical methods. Further, we study $SU(N_c)$ models of composite dark matter and provide simple power series fits to our pNRQCD results that can be used to relate dark meson and baryon masses to the fundamental parameters of these models. For many systems comprised entirely of heavy quarks, the quantum Monte Carlo methods employed here are less computationally demanding than lattice field theory methods, although they introduce additional perturbative approximations. The formalism presented here may therefore be particularly useful for predicting composite dark matter properties for a wide range of $N_c$ and heavy fermion masses.
|
hep-ph/0210046
|
Krutov A. F.
|
A.F. Krutov (Samara State University), V.E. Troitsky (D.V. Skobeltsyn
Institute of Nuclear Physics, Moscow State University)
|
Relativistic Instant--Form Approach to the Structure of Two-Body
Composite Systems. II. Nonzero Spin
|
20 pages, 4 figures, 1 table. This is the second part of the paper
published in Phys.Rev.C 65, 045501 (2002)
|
Phys.Rev. C65 (2002) 045501
|
10.1103/PhysRevC.68.018501
| null |
hep-ph
| null |
The relativistic approach to electroweak properties of two-particle composite
systems developed in previous work is generalized here to the case of nonzero
spin. This approach is based on the use of the instant form of relativistic
Hamiltonian dynamics. The generalization makes use of a special mathematical
technique for the parametrization of matrix elements of electroweak current
operators in terms of form factors. In this technique the parametrization is a
realization of theWigner--Eckart theorem on the Poincar\'e group and form
factors are reduced matrix elements. As in the case of zero spin the
electroweak current matrix element satisfies the relativistic covariance
conditions and in the case of electromagnetic current it also automatically
satisfies the conservation law. Physical approximations such as, for example,
the relativistic impulse approximation, are formulated in terms of reduced
matrix elements. The electromagnetic structure of $\rho$ meson is calculated as
an example of realization of the technique proposed.
|
[
{
"created": "Thu, 3 Oct 2002 07:11:48 GMT",
"version": "v1"
}
] |
2013-05-29
|
[
[
"Krutov",
"A. F.",
"",
"Samara State University"
],
[
"Troitsky",
"V. E.",
"",
"D.V. Skobeltsyn\n Institute of Nuclear Physics, Moscow State University"
]
] |
The relativistic approach to electroweak properties of two-particle composite systems developed in previous work is generalized here to the case of nonzero spin. This approach is based on the use of the instant form of relativistic Hamiltonian dynamics. The generalization makes use of a special mathematical technique for the parametrization of matrix elements of electroweak current operators in terms of form factors. In this technique the parametrization is a realization of theWigner--Eckart theorem on the Poincar\'e group and form factors are reduced matrix elements. As in the case of zero spin the electroweak current matrix element satisfies the relativistic covariance conditions and in the case of electromagnetic current it also automatically satisfies the conservation law. Physical approximations such as, for example, the relativistic impulse approximation, are formulated in terms of reduced matrix elements. The electromagnetic structure of $\rho$ meson is calculated as an example of realization of the technique proposed.
|
0906.3695
|
Matthew Lake Mr
|
Matthew Lake, Steven Thomas, John Ward
|
String Necklaces and Primordial Black Holes from Type IIB Strings
|
45 pages, 9 figures, LaTeX; published version
|
JHEP 0912:033,2009
|
10.1088/1126-6708/2009/12/033
|
QMUL-PH-09-15, UVIC-TH-09-09
|
hep-ph astro-ph.CO hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider a model of static cosmic string loops in type IIB string theory,
where the strings wrap cycles within the internal space. The strings are not
topologically stabilised, however the presence of a lifting potential traps the
windings giving rise to kinky cycloops. We find that PBH formation occurs at
early times in a small window, whilst at late times we observe the formation of
dark matter relics in the scaling regime. This is in stark contrast to previous
predictions based on field theoretic models. We also consider the PBH
contribution to the mass density of the universe, and use the experimental data
to impose bounds on the string theory parameters.
|
[
{
"created": "Fri, 19 Jun 2009 18:14:03 GMT",
"version": "v1"
},
{
"created": "Fri, 5 Feb 2010 16:42:32 GMT",
"version": "v2"
}
] |
2010-02-05
|
[
[
"Lake",
"Matthew",
""
],
[
"Thomas",
"Steven",
""
],
[
"Ward",
"John",
""
]
] |
We consider a model of static cosmic string loops in type IIB string theory, where the strings wrap cycles within the internal space. The strings are not topologically stabilised, however the presence of a lifting potential traps the windings giving rise to kinky cycloops. We find that PBH formation occurs at early times in a small window, whilst at late times we observe the formation of dark matter relics in the scaling regime. This is in stark contrast to previous predictions based on field theoretic models. We also consider the PBH contribution to the mass density of the universe, and use the experimental data to impose bounds on the string theory parameters.
|
hep-ph/9912330
|
Jae Sik Lee
|
S.Y. Choi and Jae Sik Lee
|
Probing MSSM Higgs Sector with Explicit CP Violation at a Photon Linear
Collider
|
18 pages, 5 figures. Some comments added and typos corrected. To
appear in Phys. Rev. D
|
Phys.Rev.D62:036005,2000
|
10.1103/PhysRevD.62.036005
|
KIAS-P99110
|
hep-ph
| null |
The CP properties of Higgs bosons can be probed through their s-channel
resonance productions via photon-photon collisions by use of circularly and/or
linearly polarized backscattered laser photons at a TeV-scale linear e^+ e^-
collider. Exploiting this powerful tool, we investigate in detail the Higgs
sector of the minimal supersymmetric Standard Model with explicit CP violation.
|
[
{
"created": "Tue, 14 Dec 1999 10:09:10 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Feb 2000 03:30:09 GMT",
"version": "v2"
}
] |
2014-11-17
|
[
[
"Choi",
"S. Y.",
""
],
[
"Lee",
"Jae Sik",
""
]
] |
The CP properties of Higgs bosons can be probed through their s-channel resonance productions via photon-photon collisions by use of circularly and/or linearly polarized backscattered laser photons at a TeV-scale linear e^+ e^- collider. Exploiting this powerful tool, we investigate in detail the Higgs sector of the minimal supersymmetric Standard Model with explicit CP violation.
|
1607.02932
|
Mikhail Ivanov
|
Mikhail A. Ivanov, J\"urgen G. K\"orner, Chien-Thang Tran
|
Analyzing new physics in the decays $\bar{B}^0 \to
D^{(\ast)}\tau^-\bar\nu_{\tau}$ with form factors obtained from the covariant
quark model
|
31 pages, 10 figures, some corrections made, discussions extended,
figures updated, references added; a version to appear in PRD
|
Phys. Rev. D 94, 094028 (2016)
|
10.1103/PhysRevD.94.094028
|
MITP/16-073
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study possible New Physics (NP) effects in the exclusive decays $\bar{B}^0
\to D^{(\ast)} \tau^- \bar{\nu}_{\tau}$. We extend the Standard Model (SM) by
taking into account right-handed vector (axial), left- and right-handed
(pseudo)scalar, and tensor current contributions. The $\bar{B}^0 \to
D^{(\ast)}$ transition form factors are calculated in the full kinematic $q^2$
range by employing a covariant quark model developed by us. We provide
constraints on NP operators based on measurements of the ratios of branching
fractions $R(D^{(\ast)}) \equiv \mathcal{B}(\bar{B}^0 \to D^{(\ast)} \tau^-
\bar{\nu}_{\tau})/ \mathcal{B}(\bar{B}^0 \to D^{(\ast)} \mu^- \bar{\nu}_{\mu})$
and consider the effects of these operators on physical observables in
different NP scenarios. We also derive the four-fold angular distribution for
the cascade decay $\bar {B}^0\to D^{\ast\,+}(\to D^0\pi^+)\tau^-\bar\nu_\tau$
which allows one to analyze the polarization of the $D^{\ast}$ meson in the
presence of NP effects. We discuss several strategies to distinguish between
various NP contributions.
|
[
{
"created": "Mon, 11 Jul 2016 13:04:27 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Nov 2016 10:00:22 GMT",
"version": "v2"
}
] |
2016-11-30
|
[
[
"Ivanov",
"Mikhail A.",
""
],
[
"Körner",
"Jürgen G.",
""
],
[
"Tran",
"Chien-Thang",
""
]
] |
We study possible New Physics (NP) effects in the exclusive decays $\bar{B}^0 \to D^{(\ast)} \tau^- \bar{\nu}_{\tau}$. We extend the Standard Model (SM) by taking into account right-handed vector (axial), left- and right-handed (pseudo)scalar, and tensor current contributions. The $\bar{B}^0 \to D^{(\ast)}$ transition form factors are calculated in the full kinematic $q^2$ range by employing a covariant quark model developed by us. We provide constraints on NP operators based on measurements of the ratios of branching fractions $R(D^{(\ast)}) \equiv \mathcal{B}(\bar{B}^0 \to D^{(\ast)} \tau^- \bar{\nu}_{\tau})/ \mathcal{B}(\bar{B}^0 \to D^{(\ast)} \mu^- \bar{\nu}_{\mu})$ and consider the effects of these operators on physical observables in different NP scenarios. We also derive the four-fold angular distribution for the cascade decay $\bar {B}^0\to D^{\ast\,+}(\to D^0\pi^+)\tau^-\bar\nu_\tau$ which allows one to analyze the polarization of the $D^{\ast}$ meson in the presence of NP effects. We discuss several strategies to distinguish between various NP contributions.
|
hep-ph/0603068
|
Borut Paul Kersevan
|
B. P. Kersevan I. Hinchliffe
|
A Consistent Prescription for the Production Involving Massive Quarks in
Hadron Collisions
| null |
JHEP 0609:033,2006
|
10.1088/1126-6708/2006/09/033
| null |
hep-ph
| null |
This paper addresses the issue of production of charm or bottom quarks in
association with a high pT process in hadron hadron collision. These quarks can
be produced either as part of the hard scattering process or as a remnant from
the structure functions. The latter sums terms of the type (alpha_s
log(pT/mq))^n. If structure functions of charm or bottom quarks are used
together with a hard process which also allows production of these quarks
double counting occurs. This paper describes the correct procedure and provides
two examples of its implimentation in single top and Drell-Yan at the LHC.
|
[
{
"created": "Thu, 9 Mar 2006 06:58:08 GMT",
"version": "v1"
}
] |
2010-02-03
|
[
[
"Hinchliffe",
"B. P. Kersevan I.",
""
]
] |
This paper addresses the issue of production of charm or bottom quarks in association with a high pT process in hadron hadron collision. These quarks can be produced either as part of the hard scattering process or as a remnant from the structure functions. The latter sums terms of the type (alpha_s log(pT/mq))^n. If structure functions of charm or bottom quarks are used together with a hard process which also allows production of these quarks double counting occurs. This paper describes the correct procedure and provides two examples of its implimentation in single top and Drell-Yan at the LHC.
|
2102.00440
|
Mais Suleymanov
|
Mais Suleymanov
|
Energy and mass dependencies for the characteristics of $p_T$ regions
observed at LHC energies
|
15 pages,12 figures,4 tables
| null |
10.1134/S1063779623040305
| null |
hep-ph nucl-ex
|
http://creativecommons.org/licenses/by/4.0/
|
The $p_T$ distributions of the $K^0$- and $\phi$ - mesons produced in the
$pp$ collisions at $\sqrt{s}=2.76 TeV$ have been analyzed by fitting them using
the exponential function. It was observed that the distributions contain
several $p_T$ regions similar to the cases with the charged particles, $\pi^0$-
and $\eta$- mesons produced in the same events. These regions could be
characterized using three variables: the length of the region $L^{c}_K $ and
free fitting parameters $a^{c}_K $ and $b^{c}_K $. It was observed that the
values of the parameters as a function of energy grouped around certain lines
and there are jump-like changes. These observations together with the effect of
existing the several $p_T$ regions can say on discrete energy dependencies for
the $L^{c}_K $ , $a^{c}_K $ and $b^{c}_K $. The lengths of the regions increase
with the mass of the particles. This increase gets stronger with energy. The
mass dependencies of the parameters $a^{c}_K $ and $b^{c}_K $ show a regime
change at a mass $\simeq 500 MeV/c^2$. According to the phenomenology of string
theory, these results could be explained by two processes occurring
simultaneously: string hadronization and string breaking. In the experiment we
can only measure the spectrum of the hadronized particles, since we cannot
access the spectrum of the strings themselves. The string breaking effect could
be a signal of string formations and the reason behind the observation of
several $p_T$ regions and the jump-like changes for the characteristics of the
regions.
|
[
{
"created": "Sun, 31 Jan 2021 12:41:14 GMT",
"version": "v1"
}
] |
2023-08-16
|
[
[
"Suleymanov",
"Mais",
""
]
] |
The $p_T$ distributions of the $K^0$- and $\phi$ - mesons produced in the $pp$ collisions at $\sqrt{s}=2.76 TeV$ have been analyzed by fitting them using the exponential function. It was observed that the distributions contain several $p_T$ regions similar to the cases with the charged particles, $\pi^0$- and $\eta$- mesons produced in the same events. These regions could be characterized using three variables: the length of the region $L^{c}_K $ and free fitting parameters $a^{c}_K $ and $b^{c}_K $. It was observed that the values of the parameters as a function of energy grouped around certain lines and there are jump-like changes. These observations together with the effect of existing the several $p_T$ regions can say on discrete energy dependencies for the $L^{c}_K $ , $a^{c}_K $ and $b^{c}_K $. The lengths of the regions increase with the mass of the particles. This increase gets stronger with energy. The mass dependencies of the parameters $a^{c}_K $ and $b^{c}_K $ show a regime change at a mass $\simeq 500 MeV/c^2$. According to the phenomenology of string theory, these results could be explained by two processes occurring simultaneously: string hadronization and string breaking. In the experiment we can only measure the spectrum of the hadronized particles, since we cannot access the spectrum of the strings themselves. The string breaking effect could be a signal of string formations and the reason behind the observation of several $p_T$ regions and the jump-like changes for the characteristics of the regions.
|
0809.2060
|
Michael Sarrazin
|
Michael Sarrazin, Fabrice Petit
|
Laser frequency combs and ultracold neutrons to probe braneworlds
through induced matter swapping between branes
|
14 pages, 4 figures. Published version. Published in Phys. Rev. D
|
Phys.Rev.D83:035009,2011
|
10.1103/PhysRevD.83.035009
| null |
hep-ph gr-qc hep-th physics.atom-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This paper investigates a new experimental framework to test the braneworld
hypothesis. Recent theoretical results have shown the possibility of matter
exchange between branes under the influence of suitable magnetic vector
potentials. It is shown that the required conditions might be achieved with
present-day technology. The experiment uses a source of pulsed and coherent
electromagnetic radiation and relies on the Hansch frequency comb technique
well-known in ultrahigh-precision spectroscopy. A good matter candidate for
testing the hypothesis is a polarized ultracold neutron gas for which the
number of swapped neutrons is measured.
|
[
{
"created": "Thu, 11 Sep 2008 17:11:37 GMT",
"version": "v1"
},
{
"created": "Sun, 27 Jun 2010 08:48:40 GMT",
"version": "v2"
},
{
"created": "Mon, 24 Jan 2011 22:27:42 GMT",
"version": "v3"
},
{
"created": "Tue, 15 Feb 2011 20:56:12 GMT",
"version": "v4"
}
] |
2011-02-22
|
[
[
"Sarrazin",
"Michael",
""
],
[
"Petit",
"Fabrice",
""
]
] |
This paper investigates a new experimental framework to test the braneworld hypothesis. Recent theoretical results have shown the possibility of matter exchange between branes under the influence of suitable magnetic vector potentials. It is shown that the required conditions might be achieved with present-day technology. The experiment uses a source of pulsed and coherent electromagnetic radiation and relies on the Hansch frequency comb technique well-known in ultrahigh-precision spectroscopy. A good matter candidate for testing the hypothesis is a polarized ultracold neutron gas for which the number of swapped neutrons is measured.
|
1007.4513
|
Boris Kopeliovich
|
B. Z. Kopeliovich
|
Puzzles of J/Psi production off nuclei
|
15 pages, 8 figures, Invited talk at the Workshop "Saturation, the
Color Glass Condensate and Glasma: What Have we Learned from RHIC?", BNL, May
10-12, 2010
|
Nucl.Phys.A854:187-197,2011
|
10.1016/j.nuclphysa.2010.08.015
|
USM-TH-270
|
hep-ph nucl-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Nuclear effects for J/Psi production in pA collisions are controlled by the
coherence and color transparency effects. Color transparency onsets when the
time of formation of the charmonium wave function becomes longer than the
inter-nucleon spacing. In this energy regime the effective break-up cross
section for a c-cbar dipole depends on energy and nuclear path length, and
agrees well with data from fixed target experiments, both in magnitude and
energy dependence. At higher energies of RHIC and LHC coherence in c-cbar pair
production leads to charm quark shadowing which is a complement to the high
twist break up cross section. These two effects explain well with no adjusted
parameters the magnitude and rapidity dependence of nuclear suppression of
J/Psi observed at RHIC in dAu collisions, while the contribution of leading
twist gluon shadowing is found to be vanishingly small. A novel mechanism of
double color filtering for c-cbar dipoles makes nuclei significantly more
transparent in AA compared to pA collisions. This is one of the mechanisms
which make impossible a model independent "data driven" extrapolation from pA
to AA. This effect also explains the enhancement of nuclear suppression
observed at forward rapidities in AA collisions at RHIC, what hardly can be
related to the produced dense medium. J/Psi is found to be a clean and
sensitive tool measuring the transport coefficient characterizing the dense
matter created in AA collisions. RHIC data for pT dependence of J/Psi
production in nuclear collisions are well explained with the low value of the
transport coefficient q_0-hat<0.5 GeV^2/fm.
|
[
{
"created": "Mon, 26 Jul 2010 17:36:06 GMT",
"version": "v1"
},
{
"created": "Fri, 27 Aug 2010 11:43:00 GMT",
"version": "v2"
}
] |
2011-03-15
|
[
[
"Kopeliovich",
"B. Z.",
""
]
] |
Nuclear effects for J/Psi production in pA collisions are controlled by the coherence and color transparency effects. Color transparency onsets when the time of formation of the charmonium wave function becomes longer than the inter-nucleon spacing. In this energy regime the effective break-up cross section for a c-cbar dipole depends on energy and nuclear path length, and agrees well with data from fixed target experiments, both in magnitude and energy dependence. At higher energies of RHIC and LHC coherence in c-cbar pair production leads to charm quark shadowing which is a complement to the high twist break up cross section. These two effects explain well with no adjusted parameters the magnitude and rapidity dependence of nuclear suppression of J/Psi observed at RHIC in dAu collisions, while the contribution of leading twist gluon shadowing is found to be vanishingly small. A novel mechanism of double color filtering for c-cbar dipoles makes nuclei significantly more transparent in AA compared to pA collisions. This is one of the mechanisms which make impossible a model independent "data driven" extrapolation from pA to AA. This effect also explains the enhancement of nuclear suppression observed at forward rapidities in AA collisions at RHIC, what hardly can be related to the produced dense medium. J/Psi is found to be a clean and sensitive tool measuring the transport coefficient characterizing the dense matter created in AA collisions. RHIC data for pT dependence of J/Psi production in nuclear collisions are well explained with the low value of the transport coefficient q_0-hat<0.5 GeV^2/fm.
|
1903.10823
|
Kenji Nishiwaki
|
Shinya Matsuzaki, Kenji Nishiwaki, Kei Yamamoto
|
Simultaneous explanation of $K$ and $B$ anomalies in vectorlike
compositeness
|
13 pages, 4 figures (v2, some references added); Contribution to the
Proceedings of the Corfu Summer Institute 2018 "School and Workshops on
Elementary Particle Physics and Gravity" (CORFU2018), 31 August - 28
September, 2018, Corfu, Greece
| null | null | null |
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
We address the presently reported significant flavor anomalies in the $K$ and
$B$ meson systems such as the CP violating Kaon decay ($\epsilon'/\epsilon$)
and lepton-flavor universality violation in $B$ meson decays ($R_{K^{(*)}},$
and also commenting ${R_{D^{(*)}}}$), by proposing flavorful and chiral vector
bosons as the new physics constitution at $\sim 1\,\mathrm{TeV}$.
Interestingly, if the new (composite) vector bosons are quite heavier than
$\sim 1\,\mathrm{TeV}$, we face a difficulty in addressing the anomaly in
$\epsilon'/\epsilon$ consistently with the constraint from the
$K^0$-$\overline{K^0}$ mixing. Both of the anomalies can be addressed within
$1\sigma$ confidence levels individually, where the relevant parameter space
will be investigated by the NA62 and KOTO experiments, in addition to direct
searches at the large hadron collider.
|
[
{
"created": "Tue, 26 Mar 2019 12:11:39 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Apr 2019 08:49:02 GMT",
"version": "v2"
}
] |
2019-04-03
|
[
[
"Matsuzaki",
"Shinya",
""
],
[
"Nishiwaki",
"Kenji",
""
],
[
"Yamamoto",
"Kei",
""
]
] |
We address the presently reported significant flavor anomalies in the $K$ and $B$ meson systems such as the CP violating Kaon decay ($\epsilon'/\epsilon$) and lepton-flavor universality violation in $B$ meson decays ($R_{K^{(*)}},$ and also commenting ${R_{D^{(*)}}}$), by proposing flavorful and chiral vector bosons as the new physics constitution at $\sim 1\,\mathrm{TeV}$. Interestingly, if the new (composite) vector bosons are quite heavier than $\sim 1\,\mathrm{TeV}$, we face a difficulty in addressing the anomaly in $\epsilon'/\epsilon$ consistently with the constraint from the $K^0$-$\overline{K^0}$ mixing. Both of the anomalies can be addressed within $1\sigma$ confidence levels individually, where the relevant parameter space will be investigated by the NA62 and KOTO experiments, in addition to direct searches at the large hadron collider.
|
1207.0234
|
Clifford Cheung
|
Clifford Cheung and Hannes L. Roberts
|
Higgs Mass from D-Terms: a Litmus Test
|
7 pages, 9 figures
| null |
10.1007/JHEP12(2013)018
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We explore supersymmetric theories in which the Higgs mass is boosted by the
non-decoupling D-terms of an extended $U(1)_X$ gauge symmetry, defined here to
be a general linear combination of hypercharge, baryon number, and lepton
number. Crucially, the gauge coupling, $g_X$, is bounded from below to
accommodate the Higgs mass, while the quarks and leptons are required by gauge
invariance to carry non-zero charge under $U(1)_X$. This induces an irreducible
rate, $\sigma$BR, for $pp \rightarrow X \rightarrow \ell\ell$ relevant to
existing and future resonance searches, and gives rise to higher dimension
operators that are stringently constrained by precision electroweak
measurements. Combined, these bounds define a maximally allowed region in the
space of observables, ($\sigma$BR, $m_X$), outside of which is excluded by
naturalness and experimental limits. If natural supersymmetry utilizes
non-decoupling D-terms, then the associated $X$ boson can only be observed
within this window, providing a model independent `litmus test' for this broad
class of scenarios at the LHC. Comparing limits, we find that current LHC
results only exclude regions in parameter space which were already disfavored
by precision electroweak data.
|
[
{
"created": "Sun, 1 Jul 2012 18:46:52 GMT",
"version": "v1"
}
] |
2015-06-05
|
[
[
"Cheung",
"Clifford",
""
],
[
"Roberts",
"Hannes L.",
""
]
] |
We explore supersymmetric theories in which the Higgs mass is boosted by the non-decoupling D-terms of an extended $U(1)_X$ gauge symmetry, defined here to be a general linear combination of hypercharge, baryon number, and lepton number. Crucially, the gauge coupling, $g_X$, is bounded from below to accommodate the Higgs mass, while the quarks and leptons are required by gauge invariance to carry non-zero charge under $U(1)_X$. This induces an irreducible rate, $\sigma$BR, for $pp \rightarrow X \rightarrow \ell\ell$ relevant to existing and future resonance searches, and gives rise to higher dimension operators that are stringently constrained by precision electroweak measurements. Combined, these bounds define a maximally allowed region in the space of observables, ($\sigma$BR, $m_X$), outside of which is excluded by naturalness and experimental limits. If natural supersymmetry utilizes non-decoupling D-terms, then the associated $X$ boson can only be observed within this window, providing a model independent `litmus test' for this broad class of scenarios at the LHC. Comparing limits, we find that current LHC results only exclude regions in parameter space which were already disfavored by precision electroweak data.
|
hep-ph/0107160
|
Robert Brandenberger
|
Mingzhe Li, Wenbin Lin, Xinmin Zhang (IHEP, Beijing) and Robert
Brandenberger (Brown Univ.)
|
Termination of the Phase of Quintessence by Gravitational Back-Reaction
|
7 pages a few clarifying comments added
|
Phys.Rev. D65 (2002) 023519
|
10.1103/PhysRevD.65.023519
| null |
hep-ph astro-ph gr-qc hep-th
| null |
We study the effects of gravitational back-reaction in models of
Quintessence. The effective energy-momentum tensor with which cosmological
fluctuations back-react on the background metric will in some cases lead to a
termination of the phase of acceleration. The fluctuations we make use of are
the perturbations in our present Universe. Their amplitude is normalized by
recent measurements of anisotropies in the cosmic microwave background, their
slope is taken to be either scale-invariant, or characterized by a slightly
blue tilt. In the latter case, we find that the back-reaction effect of
fluctuations whose present wavelength is smaller than the Hubble radius but
which are stretched beyond the Hubble radius by the accelerated expansion
during the era of Quintessence domination can become large. Since the
back-reaction effects of these modes oppose the acceleration, back-reaction
will lead to a truncation of the period of Quintessence domination. This result
impacts on the recent discussions of the potential incompatibility between
string theory and Quintessence.
|
[
{
"created": "Sat, 14 Jul 2001 21:24:47 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Sep 2001 09:39:33 GMT",
"version": "v2"
}
] |
2009-11-07
|
[
[
"Li",
"Mingzhe",
"",
"IHEP, Beijing"
],
[
"Lin",
"Wenbin",
"",
"IHEP, Beijing"
],
[
"Zhang",
"Xinmin",
"",
"IHEP, Beijing"
],
[
"Brandenberger",
"Robert",
"",
"Brown Univ."
]
] |
We study the effects of gravitational back-reaction in models of Quintessence. The effective energy-momentum tensor with which cosmological fluctuations back-react on the background metric will in some cases lead to a termination of the phase of acceleration. The fluctuations we make use of are the perturbations in our present Universe. Their amplitude is normalized by recent measurements of anisotropies in the cosmic microwave background, their slope is taken to be either scale-invariant, or characterized by a slightly blue tilt. In the latter case, we find that the back-reaction effect of fluctuations whose present wavelength is smaller than the Hubble radius but which are stretched beyond the Hubble radius by the accelerated expansion during the era of Quintessence domination can become large. Since the back-reaction effects of these modes oppose the acceleration, back-reaction will lead to a truncation of the period of Quintessence domination. This result impacts on the recent discussions of the potential incompatibility between string theory and Quintessence.
|
2403.09343
|
Igor Reis
|
Igor Reis, Emmanuel Moulin, Aion Viana and Victor P. Goncalves
|
Sensitivity to sub-GeV dark matter from cosmic-ray scattering with
very-high-energy gamma-ray observatories
|
21 pages, 8 figures. Accepted for publication in JCAP
| null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
Huge efforts have been deployed to detect dark matter (DM) in the GeV-TeV
mass range involving various detection techniques, and led to strong
constraints in the available parameter space. We compute here the sensitivity
to sub-GeV DM that can be probed from the inevitable cosmic-ray scattering onto
DM particles populating the Milky Way halo. Inelastic scattering of energetic
cosmic rays off DM would produce high-energy gamma rays in the final state,
providing a new avenue to probe the poorly-constrained so far sub-GeV dark
matter mass range. In this work we derive sensitivity forecasts for the
inelastic cosmic-ray proton - DM cross section for current and future
very-high-energy gamma-ray observatories such as H.E.S.S., LHAASO, CTA and SWGO
in the 100 eV to 100 MeV mass range. These inelastic cross section constraints
are converted to the elastic proton - DM cross section to highlight further
complementarity with cosmological, collider and direct detection searches. The
sensitivity computed at 95\% confidence level on the elastic cross section
reaches $\sim$2$\times$ 10$^{-32}$ cm$^2$ for a 100 keV DM mass for
H.E.S.S.-like and $\sim$7$\times$ 10$^{-34}$ cm$^2$ for a $\sim$1 keV DM mass
for LHAASO. The sensitivity prospects for CTA and a strawman SWGO model reach
$\sim$6$\times$ 10$^{-34}$ cm$^2$ and $\sim$4$\times$ 10$^{-35}$ cm$^2$, for DM
masses of 10 keV and 1 keV, respectively. The sensitivity reach of the
gamma-ray observatories considered here enables to probe an uncharted region of
the DM mass - cross section parameter space.
|
[
{
"created": "Thu, 14 Mar 2024 12:45:40 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Jun 2024 12:37:29 GMT",
"version": "v2"
}
] |
2024-06-12
|
[
[
"Reis",
"Igor",
""
],
[
"Moulin",
"Emmanuel",
""
],
[
"Viana",
"Aion",
""
],
[
"Goncalves",
"Victor P.",
""
]
] |
Huge efforts have been deployed to detect dark matter (DM) in the GeV-TeV mass range involving various detection techniques, and led to strong constraints in the available parameter space. We compute here the sensitivity to sub-GeV DM that can be probed from the inevitable cosmic-ray scattering onto DM particles populating the Milky Way halo. Inelastic scattering of energetic cosmic rays off DM would produce high-energy gamma rays in the final state, providing a new avenue to probe the poorly-constrained so far sub-GeV dark matter mass range. In this work we derive sensitivity forecasts for the inelastic cosmic-ray proton - DM cross section for current and future very-high-energy gamma-ray observatories such as H.E.S.S., LHAASO, CTA and SWGO in the 100 eV to 100 MeV mass range. These inelastic cross section constraints are converted to the elastic proton - DM cross section to highlight further complementarity with cosmological, collider and direct detection searches. The sensitivity computed at 95\% confidence level on the elastic cross section reaches $\sim$2$\times$ 10$^{-32}$ cm$^2$ for a 100 keV DM mass for H.E.S.S.-like and $\sim$7$\times$ 10$^{-34}$ cm$^2$ for a $\sim$1 keV DM mass for LHAASO. The sensitivity prospects for CTA and a strawman SWGO model reach $\sim$6$\times$ 10$^{-34}$ cm$^2$ and $\sim$4$\times$ 10$^{-35}$ cm$^2$, for DM masses of 10 keV and 1 keV, respectively. The sensitivity reach of the gamma-ray observatories considered here enables to probe an uncharted region of the DM mass - cross section parameter space.
|
2402.03301
|
Gudrun Heinrich
|
Bakul Agarwal, Gudrun Heinrich, Stephen P. Jones, Matthias Kerner,
Sven Yannick Klein, Jannis Lang, Vitaly Magerya, Anton Olsson
|
Two-loop amplitudes for ttH production: the quark-initiated Nf-part
|
Correction of LO event distribution in Fig.2
|
J. High Energ. Phys. 2024, 13
|
10.1007/JHEP05(2024)013
|
IPPP/24/03, KA-TP-02-2024, P3H-24-007, TTK-24-03
|
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We present numerical results for the two-loop virtual amplitude entering the
NNLO corrections to Higgs boson production in association with a top quark pair
at the LHC, focusing, as a proof of concept of our method, on the part of the
quark-initiated channel containing loops of massless or massive quarks. Results
for the UV renormalised and IR subtracted two-loop amplitude for each colour
structure are given at selected phase-space points and visualised in terms of
surfaces as a function of two-dimensional slices of the full phase space.
|
[
{
"created": "Mon, 5 Feb 2024 18:57:58 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Apr 2024 14:09:00 GMT",
"version": "v2"
},
{
"created": "Thu, 30 May 2024 13:23:02 GMT",
"version": "v3"
}
] |
2024-05-31
|
[
[
"Agarwal",
"Bakul",
""
],
[
"Heinrich",
"Gudrun",
""
],
[
"Jones",
"Stephen P.",
""
],
[
"Kerner",
"Matthias",
""
],
[
"Klein",
"Sven Yannick",
""
],
[
"Lang",
"Jannis",
""
],
[
"Magerya",
"Vitaly",
""
],
[
"Olsson",
"Anton",
""
]
] |
We present numerical results for the two-loop virtual amplitude entering the NNLO corrections to Higgs boson production in association with a top quark pair at the LHC, focusing, as a proof of concept of our method, on the part of the quark-initiated channel containing loops of massless or massive quarks. Results for the UV renormalised and IR subtracted two-loop amplitude for each colour structure are given at selected phase-space points and visualised in terms of surfaces as a function of two-dimensional slices of the full phase space.
|
hep-ph/0212391
|
Arcadi Santamaria
|
J.F. Oliver, J. Papavassiliou and A. Santamaria
|
Universal extra dimensions and Z->b bar-b
|
16 pages, 4 figures, revtex4
|
Phys.Rev. D67 (2003) 056002
|
10.1103/PhysRevD.67.056002
|
FTUV-02-1230, IFIC/02-65
|
hep-ph
| null |
We study, at the one loop level, the dominant contributions from a single
universal extra dimension to the process (Z\to b\bar{b}). By resorting to the
gaugeless limit of the theory we explain why the result is expected to display
a strong dependence on the mass of the top-quark, not identified in the early
literature. A detailed calculation corroborates this expectation, giving rise
to a lower bound for the compactification scale which is comparable to that
obtained from the $\rho$ parameter. An estimate of the subleading corrections
is furnished, together with a qualitative discussion on the difference between
the present results and those derived previously for the non-universal case.
|
[
{
"created": "Mon, 30 Dec 2002 12:07:54 GMT",
"version": "v1"
}
] |
2009-11-07
|
[
[
"Oliver",
"J. F.",
""
],
[
"Papavassiliou",
"J.",
""
],
[
"Santamaria",
"A.",
""
]
] |
We study, at the one loop level, the dominant contributions from a single universal extra dimension to the process (Z\to b\bar{b}). By resorting to the gaugeless limit of the theory we explain why the result is expected to display a strong dependence on the mass of the top-quark, not identified in the early literature. A detailed calculation corroborates this expectation, giving rise to a lower bound for the compactification scale which is comparable to that obtained from the $\rho$ parameter. An estimate of the subleading corrections is furnished, together with a qualitative discussion on the difference between the present results and those derived previously for the non-universal case.
|
hep-ph/0405127
|
Sabine Hossenfelder
|
Sabine Hossenfelder
|
Running Coupling with Minimal Length
|
26 pages, 5 figures, typos corrected, replaced with published version
|
Phys.Rev. D70 (2004) 105003
|
10.1103/PhysRevD.70.105003
| null |
hep-ph hep-th
| null |
In models with large additional dimensions, the GUT scale can be lowered to
values accessible by future colliders. Due to modification of the loop
corrections from particles propagating into the extra dimensions, the
logarithmic running of the couplings of the Standard Model is turned into a
power law. These loop-correction are divergent and the standard way to achieve
finiteness is the introduction of a cut-off. The question remains, whether the
results are reliable as they depend on an unphysical parameter.
In this paper, we show that this running of the coupling can be calculated
within a model including the existence of a minimal length scale. The minimal
length acts as a natural regulator and allows us to confirm cut-off
computations.
|
[
{
"created": "Fri, 14 May 2004 01:01:54 GMT",
"version": "v1"
},
{
"created": "Sat, 6 Nov 2004 01:10:24 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Hossenfelder",
"Sabine",
""
]
] |
In models with large additional dimensions, the GUT scale can be lowered to values accessible by future colliders. Due to modification of the loop corrections from particles propagating into the extra dimensions, the logarithmic running of the couplings of the Standard Model is turned into a power law. These loop-correction are divergent and the standard way to achieve finiteness is the introduction of a cut-off. The question remains, whether the results are reliable as they depend on an unphysical parameter. In this paper, we show that this running of the coupling can be calculated within a model including the existence of a minimal length scale. The minimal length acts as a natural regulator and allows us to confirm cut-off computations.
|
1205.6648
|
Robert Lang
|
Robert Lang, Norbert Kaiser, and Wolfram Weise
|
Shear Viscosity of a Hot Pion Gas
|
12 pages, 7 figures. Revision includes additional Appendix B. Matches
published version
|
Eur. Phys. J. A 48 (2012) 109
|
10.1140/epja/i2012-12109-3
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The shear viscosity of an interacting pion gas is studied using the Kubo
formalism as a microscopic description of thermal systems close to global
equilibrium. We implement the skeleton expansion in order to approximate the
retarded correlator of the viscous part of the energy-momentum tensor. After
exploring this in $g\phi^4$ theory we show how the skeleton expansion can be
consistently applied to pions in chiral perturbation theory. The shear
viscosity $\eta$ is determined by the spectral width, or equivalently, the mean
free path of pions in the heat bath. We derive a new analytical result for the
mean free path which is well-conditioned for numerical evaluation and discuss
the temperature and pion-mass dependence of the mean free path and the shear
viscosity. The ratio $\eta/s$ of the interacting pion gas exceeds the lower
bound $1/4\pi$ from AdS/CFT correspondence.
|
[
{
"created": "Wed, 30 May 2012 12:47:14 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Sep 2012 12:17:09 GMT",
"version": "v2"
}
] |
2012-09-05
|
[
[
"Lang",
"Robert",
""
],
[
"Kaiser",
"Norbert",
""
],
[
"Weise",
"Wolfram",
""
]
] |
The shear viscosity of an interacting pion gas is studied using the Kubo formalism as a microscopic description of thermal systems close to global equilibrium. We implement the skeleton expansion in order to approximate the retarded correlator of the viscous part of the energy-momentum tensor. After exploring this in $g\phi^4$ theory we show how the skeleton expansion can be consistently applied to pions in chiral perturbation theory. The shear viscosity $\eta$ is determined by the spectral width, or equivalently, the mean free path of pions in the heat bath. We derive a new analytical result for the mean free path which is well-conditioned for numerical evaluation and discuss the temperature and pion-mass dependence of the mean free path and the shear viscosity. The ratio $\eta/s$ of the interacting pion gas exceeds the lower bound $1/4\pi$ from AdS/CFT correspondence.
|
1108.3390
|
Jay G. Wacker
|
Daniele S. M. Alves, Eder Izaguirre, Jay G. Wacker
|
Higgs, Binos and Gluinos: Split Susy Within Reach
|
30 pages, 7 figures
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Recent evidence from the LHC for the Higgs boson with mass between 142 GeV <
m_h < 147GeV points to PeV-scale Split Supersymmetry. This article explores the
consequences of a Higgs mass in this range and possible discovery modes for
Split Susy. Moderate lifetime gluinos, with decay lengths in the 25 microns to
10 years range, are its imminent smoking gun signature. The 7 TeV LHC will be
sensitive to the moderately lived gluinos and trilepton signatures from direct
electroweakino production. Moreover, the dark matter abundance may be obtained
from annihilation through an s-channel Higgs resonance, with the LSP almost
purely bino and mass m_chi = 70 GeV. The Higgs resonance region of Split Susy
has visible signatures in dark matter direct and indirect detection and
electric dipole moment experiments. If the anomalies go away, the majority of
Split Susy parameter space will be excluded.
|
[
{
"created": "Wed, 17 Aug 2011 04:03:22 GMT",
"version": "v1"
}
] |
2011-08-18
|
[
[
"Alves",
"Daniele S. M.",
""
],
[
"Izaguirre",
"Eder",
""
],
[
"Wacker",
"Jay G.",
""
]
] |
Recent evidence from the LHC for the Higgs boson with mass between 142 GeV < m_h < 147GeV points to PeV-scale Split Supersymmetry. This article explores the consequences of a Higgs mass in this range and possible discovery modes for Split Susy. Moderate lifetime gluinos, with decay lengths in the 25 microns to 10 years range, are its imminent smoking gun signature. The 7 TeV LHC will be sensitive to the moderately lived gluinos and trilepton signatures from direct electroweakino production. Moreover, the dark matter abundance may be obtained from annihilation through an s-channel Higgs resonance, with the LSP almost purely bino and mass m_chi = 70 GeV. The Higgs resonance region of Split Susy has visible signatures in dark matter direct and indirect detection and electric dipole moment experiments. If the anomalies go away, the majority of Split Susy parameter space will be excluded.
|
hep-ph/0108098
|
Subir Sarkar
|
Subir Sarkar & Ramon Toldra (Oxford)
|
The high energy cosmic ray spectrum from relic particle decay
|
30 pages (revtex), 12 figures (eps); Small revisions; Accepted for
publication
|
Nucl.Phys.B621:495-520,2002
|
10.1016/S0550-3213(01)00565-X
|
OUTP-01-20-P
|
hep-ph astro-ph
| null |
It has been speculated that the recently detected ultra-high energy cosmic
rays may originate from the decays of relic particles with mass of order
$10^{12}$ GeV clustered in the halo of our Galaxy. This hypothesis can be
tested through forthcoming measurements of the spectra of both high energy
cosmic nucleons and neutrinos, which are determined in this model by the
physics of QCD fragmentation, with no astrophysical uncertainties. We evolve
fragmentation spectra measured at LEP energies up to the scale of the decaying
particle mass by numerical solution of the DGLAP equations. This enables
incorporation of the effects of supersymmetry on the development of the cascade
and we also allow for decays into many-particle states. The calculated spectral
shape agrees well with present cosmic ray data beyond the
Greisen-Zatsepin-Kuzmin energy.
|
[
{
"created": "Fri, 10 Aug 2001 16:36:42 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Nov 2001 17:45:13 GMT",
"version": "v2"
}
] |
2014-11-17
|
[
[
"Sarkar",
"Subir",
"",
"Oxford"
],
[
"Toldra",
"Ramon",
"",
"Oxford"
]
] |
It has been speculated that the recently detected ultra-high energy cosmic rays may originate from the decays of relic particles with mass of order $10^{12}$ GeV clustered in the halo of our Galaxy. This hypothesis can be tested through forthcoming measurements of the spectra of both high energy cosmic nucleons and neutrinos, which are determined in this model by the physics of QCD fragmentation, with no astrophysical uncertainties. We evolve fragmentation spectra measured at LEP energies up to the scale of the decaying particle mass by numerical solution of the DGLAP equations. This enables incorporation of the effects of supersymmetry on the development of the cascade and we also allow for decays into many-particle states. The calculated spectral shape agrees well with present cosmic ray data beyond the Greisen-Zatsepin-Kuzmin energy.
|
1301.7282
|
Stefan Lanz
|
Stefan Lanz
|
Eta --> 3 pi and quark masses
|
15 pages, 5 figures, plenary talk presented at The 7th International
Workshop on Chiral Dynamics, August 6 -10, 2012, Jefferson Lab, Newport News,
Virginia, USA
|
PoS CD12:007,2013
| null |
LU TP 13-02
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In recent years, the decay eta --> 3 pi has received considerable attention
from experimental and theoretical side. It is of particular theoretical
interest because it allows for the determination of (m_u - m_d). In addition,
for many years now theory has had difficulties to understand the slope of the
neutral channel Dalitz plot distribution, which in contrast is very well
measured. I discuss here the relation of the decay to the masses of the light
quarks and review a number of theoretical and experimental works that are
concerned with these questions.
|
[
{
"created": "Wed, 30 Jan 2013 16:49:56 GMT",
"version": "v1"
}
] |
2013-08-26
|
[
[
"Lanz",
"Stefan",
""
]
] |
In recent years, the decay eta --> 3 pi has received considerable attention from experimental and theoretical side. It is of particular theoretical interest because it allows for the determination of (m_u - m_d). In addition, for many years now theory has had difficulties to understand the slope of the neutral channel Dalitz plot distribution, which in contrast is very well measured. I discuss here the relation of the decay to the masses of the light quarks and review a number of theoretical and experimental works that are concerned with these questions.
|
1907.01488
|
Gui-Jun Ding
|
Xiang-Gan Liu, Gui-Jun Ding
|
Neutrino Masses and Mixing from Double Covering of Finite Modular Groups
|
19 pages
| null |
10.1007/JHEP08(2019)134
|
USTC-ICTS-19-17
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We extend the even weight modular forms of modular invariant approach to
general integral weight modular forms. We find that the modular forms of
integral weights and level $N$ can be arranged into irreducible representations
of the homogeneous finite modular group $\Gamma'_N$ which is the double
covering of $\Gamma_N$. The lowest weight 1 modular forms of level 3 are
constructed in terms of Dedekind eta-function, and they transform as a doublet
of $\Gamma'_3 \cong T'$. The modular forms of weights 2, 3, 4, 5 and 6 are
presented. We build a model of lepton masses and mixing based on $T'$ modular
symmetry.
|
[
{
"created": "Tue, 2 Jul 2019 16:50:46 GMT",
"version": "v1"
}
] |
2019-10-02
|
[
[
"Liu",
"Xiang-Gan",
""
],
[
"Ding",
"Gui-Jun",
""
]
] |
We extend the even weight modular forms of modular invariant approach to general integral weight modular forms. We find that the modular forms of integral weights and level $N$ can be arranged into irreducible representations of the homogeneous finite modular group $\Gamma'_N$ which is the double covering of $\Gamma_N$. The lowest weight 1 modular forms of level 3 are constructed in terms of Dedekind eta-function, and they transform as a doublet of $\Gamma'_3 \cong T'$. The modular forms of weights 2, 3, 4, 5 and 6 are presented. We build a model of lepton masses and mixing based on $T'$ modular symmetry.
|
hep-ph/0610269
|
Manuel Drees
|
Christian Alig (Bonn U.), Manuel Drees (Bonn U.) and Kin-ya Oda
(RIKEN)
|
QCD Effects in the Decays of TeV Black Holes
|
LaTeX with equation.sty (included), 26 pages, 4 figures. Added a few
references and one footnote
|
JHEP0612:049,2006
|
10.1088/1126-6708/2006/12/049
|
RIKEN-TH 86
|
hep-ph hep-ex hep-th
| null |
In models with ``large'' and/or warped extra dimensions, the
higher-dimensional Planck scale may be as low as a TeV. In that case black
holes with masses of a few TeV are expected to be produced copiously in
multi-TeV collisions, in particular at the LHC. These black holes decay through
Hawking radiation into typically O(20) Standard Model particles. Most of these
particles would be strongly interacting. Naively this would lead to a final
state containing 10 or so hadronic jets. However, it has been argued that the
density of strongly interacting particles would be so large that they
thermalize, forming a ``chromosphere'' rather than well-defined jets. In order
to investigate this, we perform a QCD simulation which includes parton-parton
scattering in addition to parton showering. We find the effects of parton
scattering to remain small for all cases we studied, leading to the conclusion
that the decays of black holes with masses within the reach of the LHC will not
lead to the formation of chromospheres.
|
[
{
"created": "Fri, 20 Oct 2006 13:15:49 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Oct 2006 10:07:57 GMT",
"version": "v2"
}
] |
2009-11-11
|
[
[
"Alig",
"Christian",
"",
"Bonn U."
],
[
"Drees",
"Manuel",
"",
"Bonn U."
],
[
"Oda",
"Kin-ya",
"",
"RIKEN"
]
] |
In models with ``large'' and/or warped extra dimensions, the higher-dimensional Planck scale may be as low as a TeV. In that case black holes with masses of a few TeV are expected to be produced copiously in multi-TeV collisions, in particular at the LHC. These black holes decay through Hawking radiation into typically O(20) Standard Model particles. Most of these particles would be strongly interacting. Naively this would lead to a final state containing 10 or so hadronic jets. However, it has been argued that the density of strongly interacting particles would be so large that they thermalize, forming a ``chromosphere'' rather than well-defined jets. In order to investigate this, we perform a QCD simulation which includes parton-parton scattering in addition to parton showering. We find the effects of parton scattering to remain small for all cases we studied, leading to the conclusion that the decays of black holes with masses within the reach of the LHC will not lead to the formation of chromospheres.
|
2405.04568
|
Alessandro Granelli
|
Andrea Giovanni De Marchi, Alessandro Granelli, Jacopo Nava, Filippo
Sala
|
Relic Neutrino Background from Cosmic-Ray Reservoirs
|
5 pages + appendices, 5 figures, 1 table
| null | null | null |
hep-ph astro-ph.CO astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We compute the flux of relic neutrino background (R$\nu$B) up-scattered by
ultra-high-energy (UHE) cosmic rays (CRs) in clusters that act as
CR-reservoirs. The long trapping times of UHECRs make this flux larger than
that of R$\nu$B up-scattered by UHECRs on their way to Earth, which we also
compute. We find that IceCube excludes R$\nu$B weighted overdensities larger
than $10^{10}$ in clusters, and that PUEO, RNO-G, GRAND and IceCube-Gen2 will
test values down to $10^{8}$. Our treatment incorporates the momentum transfer
dependence of the neutrino-nucleus cross section, deep inelastic scattering, a
mixed UHECR composition, and flavour information on the up-scattered R$\nu$B
fluxes for both cases of neutrino mass spectrum with normal and inverted
ordering, providing new handles to possibly disentangle the up-scattered
R$\nu$B from cosmogenic neutrinos.
|
[
{
"created": "Tue, 7 May 2024 18:00:00 GMT",
"version": "v1"
}
] |
2024-05-09
|
[
[
"De Marchi",
"Andrea Giovanni",
""
],
[
"Granelli",
"Alessandro",
""
],
[
"Nava",
"Jacopo",
""
],
[
"Sala",
"Filippo",
""
]
] |
We compute the flux of relic neutrino background (R$\nu$B) up-scattered by ultra-high-energy (UHE) cosmic rays (CRs) in clusters that act as CR-reservoirs. The long trapping times of UHECRs make this flux larger than that of R$\nu$B up-scattered by UHECRs on their way to Earth, which we also compute. We find that IceCube excludes R$\nu$B weighted overdensities larger than $10^{10}$ in clusters, and that PUEO, RNO-G, GRAND and IceCube-Gen2 will test values down to $10^{8}$. Our treatment incorporates the momentum transfer dependence of the neutrino-nucleus cross section, deep inelastic scattering, a mixed UHECR composition, and flavour information on the up-scattered R$\nu$B fluxes for both cases of neutrino mass spectrum with normal and inverted ordering, providing new handles to possibly disentangle the up-scattered R$\nu$B from cosmogenic neutrinos.
|
1208.5136
|
Shou-Shan Bao
|
Shou-Shan Bao, Hong-Lei Li, Zong-Guo Si, Yi-Bo Yang
|
Search for Majorana Neutrino Signal in $B_c$ Meson Rare Decay
|
14 pages, 6 figures
|
Commun. Theor. Phys. 59(2013) 472
|
10.1088/0253-6102/59/4/15
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the $B_C$ meson rare decay in order to search for the Majorana
neutrino signal. It is found that the the corresponding decay rate is sensitive
to the Majorana neutrino mass and mixing angles. The signal of $B_C^\pm\to
l_1^\pm l_2^\pm M^\mp $ induced by the Majorana neutrino within the mass region
$m_\pi<m_n<m_B$ may be observed at LHCb.
|
[
{
"created": "Sat, 25 Aug 2012 14:12:59 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Oct 2012 06:41:04 GMT",
"version": "v2"
},
{
"created": "Wed, 27 Mar 2013 05:45:25 GMT",
"version": "v3"
}
] |
2015-06-11
|
[
[
"Bao",
"Shou-Shan",
""
],
[
"Li",
"Hong-Lei",
""
],
[
"Si",
"Zong-Guo",
""
],
[
"Yang",
"Yi-Bo",
""
]
] |
We study the $B_C$ meson rare decay in order to search for the Majorana neutrino signal. It is found that the the corresponding decay rate is sensitive to the Majorana neutrino mass and mixing angles. The signal of $B_C^\pm\to l_1^\pm l_2^\pm M^\mp $ induced by the Majorana neutrino within the mass region $m_\pi<m_n<m_B$ may be observed at LHCb.
|
hep-ph/9701331
|
Alexander L. Bondarev
|
Alexander L. Bondarev (NC PHEP, Minsk, Belarus)
|
Method of Covariant Calculation of the Amplitudes of Processes with
Polarized Dirac Particles
|
9 pages, LaTex; talk presented at the Joint International Workshop:
VIII Workshop on High Energy Physics and Quantum Field Theory & III Workshop
on Physics at VLEPP. Zvenigorod, Russia, September 15-21, 1993
|
Proceedings of the Joint International Workshop: VIII Workshop on
High Energy Physics and Quantum Field Theory & III Workshop on Physics at
VLEPP. Zvenigorod, Russia, September 15-21, 1993. MSU Publishing Office,
Moscow, 1994, p.181-185
| null | null |
hep-ph
| null |
General scheme for covariant calculation of the amplitudes of processes with
the polarized Dirac particles is considered. It is so concretized that the
obtained expressions can be used for calculation of the amplitudes of processes
with interfering diagrams. As an illustration the expressions for the
amplitudes of processes with massless particles are presented.
|
[
{
"created": "Mon, 20 Jan 1997 18:10:35 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Bondarev",
"Alexander L.",
"",
"NC PHEP, Minsk, Belarus"
]
] |
General scheme for covariant calculation of the amplitudes of processes with the polarized Dirac particles is considered. It is so concretized that the obtained expressions can be used for calculation of the amplitudes of processes with interfering diagrams. As an illustration the expressions for the amplitudes of processes with massless particles are presented.
|
1902.07726
|
David Dunsky
|
David Dunsky, Lawrence J. Hall, Keisuke Harigaya
|
Higgs Parity, Strong CP, and Dark Matter
|
29 pages, 5 figures. Matches published version. Added references and
clarifications
|
JHEP 07 (2019) 016
|
10.1007/JHEP07(2019)016
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
An exact spacetime parity replicates the $SU(2) \times U(1)$ electroweak
interaction, the Higgs boson $H$, and the matter of the Standard Model. This
"Higgs Parity" and the mirror electroweak symmetry are spontaneously broken at
scale $v' = \left\langle{H'} \right\rangle \gg \left\langle{H}\right\rangle$,
yielding the Standard Model below $v'$ with a quartic coupling that essentially
vanishes at $v'$: $\lambda_{SM}(v') \sim 10^{-3}$. The strong CP problem is
solved as Higgs parity forces the masses of mirror quarks and ordinary quarks
to have opposite phases. Dark matter is composed of mirror electrons, $e'$,
stabilized by unbroken mirror electromagnetism. These interact with Standard
Model particles via kinetic mixing between the photon and the mirror photon,
which arises at four-loop level and is a firm prediction of the theory. Physics
below $v'$, including the mass and interaction of $e'$ dark matter, is
described by $\textit{one fewer parameter}$ than in the Standard Model. The
allowed range of $m_{e'}$ is determined by uncertainties in $(\alpha_s, m_t,
m_h)$, so that future precision measurements of these will be correlated with
the direct detection rate of $e'$ dark matter, which, together with the neutron
electric dipole moment, will probe the entire parameter space.
|
[
{
"created": "Wed, 20 Feb 2019 19:00:07 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Jul 2019 18:38:17 GMT",
"version": "v2"
}
] |
2019-07-12
|
[
[
"Dunsky",
"David",
""
],
[
"Hall",
"Lawrence J.",
""
],
[
"Harigaya",
"Keisuke",
""
]
] |
An exact spacetime parity replicates the $SU(2) \times U(1)$ electroweak interaction, the Higgs boson $H$, and the matter of the Standard Model. This "Higgs Parity" and the mirror electroweak symmetry are spontaneously broken at scale $v' = \left\langle{H'} \right\rangle \gg \left\langle{H}\right\rangle$, yielding the Standard Model below $v'$ with a quartic coupling that essentially vanishes at $v'$: $\lambda_{SM}(v') \sim 10^{-3}$. The strong CP problem is solved as Higgs parity forces the masses of mirror quarks and ordinary quarks to have opposite phases. Dark matter is composed of mirror electrons, $e'$, stabilized by unbroken mirror electromagnetism. These interact with Standard Model particles via kinetic mixing between the photon and the mirror photon, which arises at four-loop level and is a firm prediction of the theory. Physics below $v'$, including the mass and interaction of $e'$ dark matter, is described by $\textit{one fewer parameter}$ than in the Standard Model. The allowed range of $m_{e'}$ is determined by uncertainties in $(\alpha_s, m_t, m_h)$, so that future precision measurements of these will be correlated with the direct detection rate of $e'$ dark matter, which, together with the neutron electric dipole moment, will probe the entire parameter space.
|
1310.0413
|
S. Weinzierl
|
Christian Reuschle and Stefan Weinzierl
|
Decomposition of one-loop QCD amplitudes into primitive amplitudes based
on shuffle relations
|
46 pages, version to be published, v3: eq. 39 corrected
|
Phys. Rev. D 88, 105020 (2013)
|
10.1103/PhysRevD.88.105020
| null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present the decomposition of QCD partial amplitudes into primitive
amplitudes at one-loop level and tree level for arbitrary numbers of quarks and
gluons. Our method is based on shuffle relations. This method is purely
combinatorial and does not require the inversion of a system of linear
equations.
|
[
{
"created": "Tue, 1 Oct 2013 18:09:34 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Oct 2013 16:30:14 GMT",
"version": "v2"
},
{
"created": "Tue, 8 Jul 2014 11:28:49 GMT",
"version": "v3"
}
] |
2014-07-09
|
[
[
"Reuschle",
"Christian",
""
],
[
"Weinzierl",
"Stefan",
""
]
] |
We present the decomposition of QCD partial amplitudes into primitive amplitudes at one-loop level and tree level for arbitrary numbers of quarks and gluons. Our method is based on shuffle relations. This method is purely combinatorial and does not require the inversion of a system of linear equations.
|
2012.03441
|
Jean-Fran\c{c}ois Paquet
|
Tianyu Dai, Jean-Fran\c{c}ois Paquet, Derek Teaney, Steffen A. Bass
|
Parton energy loss in a hard-soft factorized approach
|
25 pages, 21 figures, match published version
|
Physical Review C 105, no.3, 034905 (2022)
|
10.1103/PhysRevC.105.034905
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
An energetic parton travelling through a quark-gluon plasma loses energy via
occasional hard scatterings and frequent softer interactions. Whether or not
these interactions admit a perturbative description, the effect of the soft
interactions can be factorized and encoded in a small number of transport
coefficients. In this work, we present a hard-soft factorized parton energy
loss model which combines a stochastic description of soft interactions and
rate-based modelling of hard scatterings. We introduce a scale to estimate the
regime of validity of the stochastic description, allowing for a better
understanding of the model's applicability at small and large coupling. We
study the energy and fermion-number cascade of energetic partons as an
application of the model.
|
[
{
"created": "Mon, 7 Dec 2020 03:57:28 GMT",
"version": "v1"
},
{
"created": "Thu, 6 May 2021 16:49:06 GMT",
"version": "v2"
},
{
"created": "Thu, 21 Apr 2022 20:00:25 GMT",
"version": "v3"
}
] |
2022-04-25
|
[
[
"Dai",
"Tianyu",
""
],
[
"Paquet",
"Jean-François",
""
],
[
"Teaney",
"Derek",
""
],
[
"Bass",
"Steffen A.",
""
]
] |
An energetic parton travelling through a quark-gluon plasma loses energy via occasional hard scatterings and frequent softer interactions. Whether or not these interactions admit a perturbative description, the effect of the soft interactions can be factorized and encoded in a small number of transport coefficients. In this work, we present a hard-soft factorized parton energy loss model which combines a stochastic description of soft interactions and rate-based modelling of hard scatterings. We introduce a scale to estimate the regime of validity of the stochastic description, allowing for a better understanding of the model's applicability at small and large coupling. We study the energy and fermion-number cascade of energetic partons as an application of the model.
|
hep-ph/0509367
|
Alejandro Lorca
|
A. Lorca
|
Fully automated calculation in fermion scattering
|
5 pages, 2 tables, 2 figures. Contribution to the X International
Workshop on Advanced Computing and Analysis Techniques in Physics Research,
ACAT 2005, May 22-27, 2005, Zeuthen (Germany)
|
Nucl.Instrum.Meth. A559 (2006) 249-252
|
10.1016/j.nima.2005.11.144
| null |
hep-ph
| null |
The package aITALC has been developed for fully automated calculations of two
fermion production at e+ e- collider and other similar reactions. We emphasize
the connection and interoperability between the different modules required for
the calculation and the external tools Diana, Form and LoopTools. Results for
e+ e- -> f anti-f, e+ e- are presented.
|
[
{
"created": "Fri, 30 Sep 2005 15:09:31 GMT",
"version": "v1"
}
] |
2009-11-11
|
[
[
"Lorca",
"A.",
""
]
] |
The package aITALC has been developed for fully automated calculations of two fermion production at e+ e- collider and other similar reactions. We emphasize the connection and interoperability between the different modules required for the calculation and the external tools Diana, Form and LoopTools. Results for e+ e- -> f anti-f, e+ e- are presented.
|
1005.3505
|
Alexander Lenz
|
Otto Eberhardt, Alexander Lenz and J\"urgen Rohrwild
|
Less space for a new family of fermions
|
38 pages, 26 figures; version identical to PRD
|
Phys.Rev.D82:095006,2010
|
10.1103/PhysRevD.82.095006
|
DO-TH 10/09, TTK-10-32
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the experimentally allowed parameter space of an extension of
the standard model (SM3) by one additional family of fermions. Therefore we
extend our previous study of the CKM like mixing constraints of a fourth
generation of quarks. In addition to the bounds from tree-level determinations
of the 3$\times$3 CKM elements and FCNC processes ($K$-, $D$-, $B_d$-,
$B_s$-mixing and the decay $b \to s \gamma$) we also investigate the
electroweak $S$, $T$, $U$ parameters, the angle $\gamma$ of the unitarity
triangle and the rare decay $B_s \to \mu^+ \mu^-$. Moreover we improve our
treatment of the QCD corrections compared to our previous analysis. We also
take leptonic contributions into account, but we neglect the mixing among
leptons. As a result we find that typically small mixing with the fourth family
is favored, but still some sizeable deviations from the SM3 results are not yet
excluded. The minimal possible value of $V_{tb}$ is 0.93. Also very large
CP-violating effects in $B_s$ mixing seem to be impossible within an extension
of the SM3 that consists of an additional fermion family alone. We find a
delicate interplay of electroweak and flavor observables, which strongly
suggests that a separate treatment of the two sectors is not feasible. In
particular we show that the inclusion of the full CKM dependence of the $S$ and
$T$ parameters in principle allows the existence of a degenerate fourth
generation of quarks.
|
[
{
"created": "Wed, 19 May 2010 17:54:48 GMT",
"version": "v1"
},
{
"created": "Fri, 21 May 2010 18:55:21 GMT",
"version": "v2"
},
{
"created": "Thu, 25 Nov 2010 11:56:19 GMT",
"version": "v3"
}
] |
2010-12-13
|
[
[
"Eberhardt",
"Otto",
""
],
[
"Lenz",
"Alexander",
""
],
[
"Rohrwild",
"Jürgen",
""
]
] |
We investigate the experimentally allowed parameter space of an extension of the standard model (SM3) by one additional family of fermions. Therefore we extend our previous study of the CKM like mixing constraints of a fourth generation of quarks. In addition to the bounds from tree-level determinations of the 3$\times$3 CKM elements and FCNC processes ($K$-, $D$-, $B_d$-, $B_s$-mixing and the decay $b \to s \gamma$) we also investigate the electroweak $S$, $T$, $U$ parameters, the angle $\gamma$ of the unitarity triangle and the rare decay $B_s \to \mu^+ \mu^-$. Moreover we improve our treatment of the QCD corrections compared to our previous analysis. We also take leptonic contributions into account, but we neglect the mixing among leptons. As a result we find that typically small mixing with the fourth family is favored, but still some sizeable deviations from the SM3 results are not yet excluded. The minimal possible value of $V_{tb}$ is 0.93. Also very large CP-violating effects in $B_s$ mixing seem to be impossible within an extension of the SM3 that consists of an additional fermion family alone. We find a delicate interplay of electroweak and flavor observables, which strongly suggests that a separate treatment of the two sectors is not feasible. In particular we show that the inclusion of the full CKM dependence of the $S$ and $T$ parameters in principle allows the existence of a degenerate fourth generation of quarks.
|
1903.09603
|
Peter Millington
|
Peter Millington
|
Fifth forces and discrete symmetry breaking
|
7 pages, JPCS format. Prepared for the proceedings of DISCRETE2018:
the Sixth Symposium on Prospects in the Physics of Discrete Symmetries, 26 -
30 November 2018, Austrian Academy of Sciences, Vienna, to appear in the
Journal of Physics: Conference Series
|
2020 J. Phys.: Conf. Ser. 1586 012024
|
10.1088/1742-6596/1586/1/012024
| null |
hep-ph astro-ph.CO astro-ph.GA gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Modifications of general relativity often involve coupling additional scalar
fields to the Ricci scalar, leading to scalar-tensor theories of Brans-Dicke
type. If the additional scalar fields are light, they can give rise to
long-range fifth forces, which are subject to stringent constraints from local
tests of gravity. In this talk, we show that Yukawa-like fifth forces only
arise for the Standard Model (SM) due to a mass mixing of the additional scalar
with the Higgs field, and we emphasise the pivotal role played by discrete and
continuous symmetry breaking. Quite remarkably, if one assumes that
sufficiently light, non-minimally coupled scalar fields exist in nature, the
non-observation of fifth forces has the potential to tell us about the
structure of the SM Higgs sector and the origin of its symmetry breaking.
Moreover, with these observations, we argue that certain classes of
scalar-tensor theories are, up to and including their dimension-four operators,
equivalent to Higgs-portal theories. In this way, ultra-light dark matter
models may also exhibit fifth-force phenomenology, and we consider the impact
on the dynamics of disk galaxies as an example.
|
[
{
"created": "Fri, 22 Mar 2019 17:00:11 GMT",
"version": "v1"
}
] |
2020-09-15
|
[
[
"Millington",
"Peter",
""
]
] |
Modifications of general relativity often involve coupling additional scalar fields to the Ricci scalar, leading to scalar-tensor theories of Brans-Dicke type. If the additional scalar fields are light, they can give rise to long-range fifth forces, which are subject to stringent constraints from local tests of gravity. In this talk, we show that Yukawa-like fifth forces only arise for the Standard Model (SM) due to a mass mixing of the additional scalar with the Higgs field, and we emphasise the pivotal role played by discrete and continuous symmetry breaking. Quite remarkably, if one assumes that sufficiently light, non-minimally coupled scalar fields exist in nature, the non-observation of fifth forces has the potential to tell us about the structure of the SM Higgs sector and the origin of its symmetry breaking. Moreover, with these observations, we argue that certain classes of scalar-tensor theories are, up to and including their dimension-four operators, equivalent to Higgs-portal theories. In this way, ultra-light dark matter models may also exhibit fifth-force phenomenology, and we consider the impact on the dynamics of disk galaxies as an example.
|
1710.08430
|
Luc Darm\'e
|
Luc Darm\'e, Soumya Rao, Leszek Roszkowski
|
Light dark Higgs boson in minimal sub-GeV dark matter scenarios
|
32 pages, 10 figures, 4 tables. An error in the estimation of the
dark matter annihilation rates has been corrected and all figures as well as
section 3.2 have been accordingly updated. References updated, typos
corrected, matches version published in JHEP
| null |
10.1007/JHEP03(2018)084
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Minimal scenarios with light (sub-GeV) dark matter whose relic density is
obtained from thermal freeze-out must include new light mediators. In
particular, a very well-motivated case is that of a new "dark" massive vector
gauge boson mediator. The mass term for such mediator is most naturally
obtained by a "dark Higgs mechanism" which leads to the presence of an often
long-lived dark Higgs boson whose mass scale is the same as that of the
mediator. We study the phenomenology and experimental constraints on two
minimal, self-consistent dark sectors that include such a light dark Higgs
boson. In one the dark matter is a pseudo-Dirac fermion, in the other a complex
scalar. We find that the constraints from BBN and CMB are considerably relaxed
in the framework of such minimal dark sectors. We present detection prospects
for the dark Higgs boson in existing and projected proton beam-dump
experiments. We show that future searches at experiments like Xenon1T or LDMX
can probe all the relevant parameter space, complementing the various upcoming
indirect constraints from astrophysical observations.
|
[
{
"created": "Mon, 23 Oct 2017 18:00:06 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Mar 2018 09:47:15 GMT",
"version": "v2"
}
] |
2018-04-18
|
[
[
"Darmé",
"Luc",
""
],
[
"Rao",
"Soumya",
""
],
[
"Roszkowski",
"Leszek",
""
]
] |
Minimal scenarios with light (sub-GeV) dark matter whose relic density is obtained from thermal freeze-out must include new light mediators. In particular, a very well-motivated case is that of a new "dark" massive vector gauge boson mediator. The mass term for such mediator is most naturally obtained by a "dark Higgs mechanism" which leads to the presence of an often long-lived dark Higgs boson whose mass scale is the same as that of the mediator. We study the phenomenology and experimental constraints on two minimal, self-consistent dark sectors that include such a light dark Higgs boson. In one the dark matter is a pseudo-Dirac fermion, in the other a complex scalar. We find that the constraints from BBN and CMB are considerably relaxed in the framework of such minimal dark sectors. We present detection prospects for the dark Higgs boson in existing and projected proton beam-dump experiments. We show that future searches at experiments like Xenon1T or LDMX can probe all the relevant parameter space, complementing the various upcoming indirect constraints from astrophysical observations.
|
1902.08768
|
Thupil Govindarajan Dr
|
T.R. Govindarajan and Nikhil Kalyanapuram
|
Stueckelberg Bosons as an Ultralight Dark Matter Candidate
|
11 pages, 4 figures, changes in presentation, additional references
|
Mod. Phys. Lett. A Vol. 33 (2019) 1950330
|
10.1142/S0217732319503309
| null |
hep-ph gr-qc hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this letter, we propose a new model of fuzzy dark matter based on
Stueckelberg theory. Dark matter is treated as a Bose-Einstein condensate of
Stueckelberg particles and the resulting cosmological effects are analyzed.
Fits are understood for the density and halo sizes of such particles and
comparison with existing models is made. Certain attractive properties of the
model are demonstrated and lines for future work are laid out.
|
[
{
"created": "Sat, 23 Feb 2019 10:03:29 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Jul 2019 04:19:14 GMT",
"version": "v2"
}
] |
2019-10-15
|
[
[
"Govindarajan",
"T. R.",
""
],
[
"Kalyanapuram",
"Nikhil",
""
]
] |
In this letter, we propose a new model of fuzzy dark matter based on Stueckelberg theory. Dark matter is treated as a Bose-Einstein condensate of Stueckelberg particles and the resulting cosmological effects are analyzed. Fits are understood for the density and halo sizes of such particles and comparison with existing models is made. Certain attractive properties of the model are demonstrated and lines for future work are laid out.
|
hep-ph/0102141
|
Pedro Miguel Martins Ferreira
|
P.M. Ferreira
|
Minimisation of a one-loop charge breaking effective potential
|
12 pages, 3 figures. One figure added and conclusions made clearer
|
Phys.Lett. B512 (2001) 379-391; Erratum-ibid. B518 (2001) 334
|
10.1016/S0370-2693(01)00716-X
|
DIAS-STP-01-03
|
hep-ph
| null |
We compute the field derivatives of a one-loop charge breaking effective
potential and analyse their effect in its minimisation. The impact on charge
breaking bounds on the MSSM parameters is discussed.
|
[
{
"created": "Mon, 12 Feb 2001 19:42:05 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Mar 2001 17:14:20 GMT",
"version": "v2"
},
{
"created": "Fri, 6 Apr 2001 16:30:36 GMT",
"version": "v3"
},
{
"created": "Mon, 25 Jun 2001 15:29:32 GMT",
"version": "v4"
}
] |
2009-11-07
|
[
[
"Ferreira",
"P. M.",
""
]
] |
We compute the field derivatives of a one-loop charge breaking effective potential and analyse their effect in its minimisation. The impact on charge breaking bounds on the MSSM parameters is discussed.
|
1110.0016
|
Iain W. Stewart
|
S. Bethke, A.H. Hoang, S. Kluth, J. Schieck, I.W. Stewart, S. Aoki, M.
Beneke, J. Blumlein, N. Brambilla, S. Brodsky, S. Descotes-Genon, J. Erler,
S. Forte, T. Gehrmann, C. Glasman, M. Golterman, S. Hashimoto, A. Kronfeld,
J. Kuhn, P. Lepage, A. Martin, V. Mateu, S. Menke, Y. Nomura, C. Pahl, F.
Petriello, A. Pich, K. Rabbertz, G. Salam, H. Schulz, R. Sommer, M.
Steinhauser, B. Webber, CP. Yuan, G. Zanderighi
|
Workshop on Precision Measurements of alphas
|
Proceedings of the "Workshop on Precision Measurements of alphas",
Feb. 9-11, 2011. v1: 75 pages; v3: 78 pages
| null | null |
MIT-CTP 4301
|
hep-ph hep-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
These are the proceedings of the "Workshop on Precision Measurements of
alphas" held at the Max-Planck-Institute for Physics, Munich, February 9-11,
2011. The workshop explored in depth the determination of alphas(mZ) in the
MS-bar scheme from the key categories where high precision measurements are
currently being made, including DIS and global PDF fits, tau-decays,
electroweak precision observables and Z-decays, event-shapes, and lattice QCD.
These proceedings contain a short summary contribution from the speakers, as
well as the lists of authors, conveners, participants, and talks.
|
[
{
"created": "Fri, 30 Sep 2011 20:35:12 GMT",
"version": "v1"
},
{
"created": "Mon, 17 Oct 2011 03:43:19 GMT",
"version": "v2"
},
{
"created": "Sat, 22 Oct 2011 16:04:37 GMT",
"version": "v3"
}
] |
2015-03-19
|
[
[
"Bethke",
"S.",
""
],
[
"Hoang",
"A. H.",
""
],
[
"Kluth",
"S.",
""
],
[
"Schieck",
"J.",
""
],
[
"Stewart",
"I. W.",
""
],
[
"Aoki",
"S.",
""
],
[
"Beneke",
"M.",
""
],
[
"Blumlein",
"J.",
""
],
[
"Brambilla",
"N.",
""
],
[
"Brodsky",
"S.",
""
],
[
"Descotes-Genon",
"S.",
""
],
[
"Erler",
"J.",
""
],
[
"Forte",
"S.",
""
],
[
"Gehrmann",
"T.",
""
],
[
"Glasman",
"C.",
""
],
[
"Golterman",
"M.",
""
],
[
"Hashimoto",
"S.",
""
],
[
"Kronfeld",
"A.",
""
],
[
"Kuhn",
"J.",
""
],
[
"Lepage",
"P.",
""
],
[
"Martin",
"A.",
""
],
[
"Mateu",
"V.",
""
],
[
"Menke",
"S.",
""
],
[
"Nomura",
"Y.",
""
],
[
"Pahl",
"C.",
""
],
[
"Petriello",
"F.",
""
],
[
"Pich",
"A.",
""
],
[
"Rabbertz",
"K.",
""
],
[
"Salam",
"G.",
""
],
[
"Schulz",
"H.",
""
],
[
"Sommer",
"R.",
""
],
[
"Steinhauser",
"M.",
""
],
[
"Webber",
"B.",
""
],
[
"Yuan",
"CP.",
""
],
[
"Zanderighi",
"G.",
""
]
] |
These are the proceedings of the "Workshop on Precision Measurements of alphas" held at the Max-Planck-Institute for Physics, Munich, February 9-11, 2011. The workshop explored in depth the determination of alphas(mZ) in the MS-bar scheme from the key categories where high precision measurements are currently being made, including DIS and global PDF fits, tau-decays, electroweak precision observables and Z-decays, event-shapes, and lattice QCD. These proceedings contain a short summary contribution from the speakers, as well as the lists of authors, conveners, participants, and talks.
|
hep-ph/0603220
|
Stefan Groote
|
S. Groote, J.G. K\"orner and A.A. Pivovarov
|
Large next-to-leading order QCD corrections to pentaquark sum rules
|
4 pages, including 3 encapsulated PostScript figures
|
Phys.Rev. D74 (2006) 017503
|
10.1103/PhysRevD.74.017503
|
MZ-TH/06-06
|
hep-ph
| null |
Using configuration space techniques, we calculate next-to-leading order
(NLO) five-loop QCD corrections to the correlators of interpolating pentaquark
currents in the limit of massless quarks. We obtain very large NLO corrections
to the spectral density which makes a standard sum rule analysis problematic.
However, the NLO corrections to the correlator in configuration space are
reasonable. We discuss the implications of our results for the phenomenological
sum rule analysis of pentaquark states.
|
[
{
"created": "Mon, 27 Mar 2006 08:25:09 GMT",
"version": "v1"
},
{
"created": "Tue, 18 Jul 2006 10:08:00 GMT",
"version": "v2"
}
] |
2009-11-11
|
[
[
"Groote",
"S.",
""
],
[
"Körner",
"J. G.",
""
],
[
"Pivovarov",
"A. A.",
""
]
] |
Using configuration space techniques, we calculate next-to-leading order (NLO) five-loop QCD corrections to the correlators of interpolating pentaquark currents in the limit of massless quarks. We obtain very large NLO corrections to the spectral density which makes a standard sum rule analysis problematic. However, the NLO corrections to the correlator in configuration space are reasonable. We discuss the implications of our results for the phenomenological sum rule analysis of pentaquark states.
|
hep-ph/0508315
|
F. Krauss
|
T. Gleisberg, S.Hoeche, F. Krauss, A. Schaelicke, S.Schumann, J.Winter
|
Event generator for the LHC
|
Talk given at ACAT05, 5 pages, three figures
|
Nucl.Instrum.Meth.A559:242-245,2006
|
10.1016/j.nima.2005.11.205
| null |
hep-ph
| null |
In this contribution the new event generation framework Sherpa will be
presented. It aims at the full simulation of events at current and future
high-energy experiments, in particular the LHC. Some results related to the
production of jets at the Tevatron will be discussed.
|
[
{
"created": "Wed, 31 Aug 2005 12:41:35 GMT",
"version": "v1"
}
] |
2008-12-18
|
[
[
"Gleisberg",
"T.",
""
],
[
"Hoeche",
"S.",
""
],
[
"Krauss",
"F.",
""
],
[
"Schaelicke",
"A.",
""
],
[
"Schumann",
"S.",
""
],
[
"Winter",
"J.",
""
]
] |
In this contribution the new event generation framework Sherpa will be presented. It aims at the full simulation of events at current and future high-energy experiments, in particular the LHC. Some results related to the production of jets at the Tevatron will be discussed.
|
2104.14112
|
Snigdha Ghosh
|
Snigdha Ghosh, Nilanjan Chaudhuri, Pradip Roy and Sourav Sarkar
|
Thermomagnetic modification of the anomalous magnetic moment of quarks
using the NJL model
|
Version published in Physical Review D
|
Phys. Rev. D 103, 116008 (2021)
|
10.1103/PhysRevD.103.116008
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The effective photon-quark-antiquark ($\gamma q \overline{q}$) vertex
function is evaluated at finite temperature in the presence of an arbitrary
external magnetic field using the two-flavor gauged Nambu--Jona-Lasinio (NJL)
model in the mean field approximation. The lowest order diagram contributing to
the magnetic form factor and the anomalous magnetic moment (AMM) of the quarks
is calculated at finite temperature and external magnetic field using the
imaginary time formalism of finite temperature field theory and the Schwinger
proper time formalism. The Schwinger propagator including all the Landau levels
with non-zero AMM of the dressed quarks is considered while calculating the
loop diagram. Using sharp as well as smooth three momentum cutoff, we
regularize the UV divergences arising from the vertex function and the
parameters of our model are chosen to reproduce the well known phenomenological
quantities at zero temperature and zero magnetic field, such as pion-decay
constant ($f_\pi$), vacuum quark condensate, vacuum pion mass ($m_\pi$) as well
as the magnetic moments of proton and neutron. We then study the temperature
and magnetic field dependence of the AMM and constituent mass of the quark. We
found that, the AMM as well as the constituent quark mass are large at the
chiral symmetry broken phase in the low temperature region. Around the
pseudo-chiral phase transition they decrease rapidly and at high temperatures
both of them approach vanishingly small values in the symmetry restored phase.
|
[
{
"created": "Thu, 29 Apr 2021 05:10:12 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Jun 2021 07:39:52 GMT",
"version": "v2"
}
] |
2021-06-16
|
[
[
"Ghosh",
"Snigdha",
""
],
[
"Chaudhuri",
"Nilanjan",
""
],
[
"Roy",
"Pradip",
""
],
[
"Sarkar",
"Sourav",
""
]
] |
The effective photon-quark-antiquark ($\gamma q \overline{q}$) vertex function is evaluated at finite temperature in the presence of an arbitrary external magnetic field using the two-flavor gauged Nambu--Jona-Lasinio (NJL) model in the mean field approximation. The lowest order diagram contributing to the magnetic form factor and the anomalous magnetic moment (AMM) of the quarks is calculated at finite temperature and external magnetic field using the imaginary time formalism of finite temperature field theory and the Schwinger proper time formalism. The Schwinger propagator including all the Landau levels with non-zero AMM of the dressed quarks is considered while calculating the loop diagram. Using sharp as well as smooth three momentum cutoff, we regularize the UV divergences arising from the vertex function and the parameters of our model are chosen to reproduce the well known phenomenological quantities at zero temperature and zero magnetic field, such as pion-decay constant ($f_\pi$), vacuum quark condensate, vacuum pion mass ($m_\pi$) as well as the magnetic moments of proton and neutron. We then study the temperature and magnetic field dependence of the AMM and constituent mass of the quark. We found that, the AMM as well as the constituent quark mass are large at the chiral symmetry broken phase in the low temperature region. Around the pseudo-chiral phase transition they decrease rapidly and at high temperatures both of them approach vanishingly small values in the symmetry restored phase.
|
hep-ph/0407337
|
Thorsten Ohl
|
Thorsten Ohl (Wuerzburg University), Jurgen Reuter (Karlsruhe
University, TTP)
|
Tests of the Noncommutative Standard Model at a Future Photon Collider
|
LaTeX, 5 pages, 5 figures (included), to appear in the proceeding of
the International Conference on Linear Colliders (LCWS 2004), April 2004,
Paris, France
| null | null |
TTP-04-11, WUE-ITP-2004-015
|
hep-ph
| null |
Extensions of the Standard Model of elementary particle physics to
noncommutative geometries are proposed by string models. Independent of this
motivation, one may consider such a model as an effective field theory with
higher-dimensional operators containing an antisymmetric rank-2 background
field. We study the signals of such a Noncommutative Standard Model (NCSM) and
analyze the discovery potential of fermion pair production at a future photon
collider.
|
[
{
"created": "Thu, 29 Jul 2004 11:42:31 GMT",
"version": "v1"
},
{
"created": "Wed, 28 May 2008 16:03:57 GMT",
"version": "v2"
}
] |
2008-05-28
|
[
[
"Ohl",
"Thorsten",
"",
"Wuerzburg University"
],
[
"Reuter",
"Jurgen",
"",
"Karlsruhe\n University, TTP"
]
] |
Extensions of the Standard Model of elementary particle physics to noncommutative geometries are proposed by string models. Independent of this motivation, one may consider such a model as an effective field theory with higher-dimensional operators containing an antisymmetric rank-2 background field. We study the signals of such a Noncommutative Standard Model (NCSM) and analyze the discovery potential of fermion pair production at a future photon collider.
|
2207.05767
|
Shuailiang Ge
|
Haipeng An, Shuailiang Ge, Wen-Qing Guo, Xiaoyuan Huang, Jia Liu,
Zhiyao Lu
|
Direct detection of dark photon dark matter using radio telescopes
|
5 pages, 3 figures + appendix. Match the accepted version (PRL)
|
Physical Review Letters 130 (2023) 181001
|
10.1103/PhysRevLett.130.181001
| null |
hep-ph astro-ph.CO astro-ph.HE hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Dark photons can be the ultralight dark matter candidate, interacting with
Standard Model particles via kinetic mixing. We propose to search for
ultralight dark photon dark matter (DPDM) through the local absorption at
different radio telescopes. The local DPDM can induce harmonic oscillations of
electrons inside the antenna of radio telescopes. It leads to a monochromatic
radio signal and can be recorded by telescope receivers. Using the observation
data from the FAST telescope, the upper limit on the kinetic mixing can already
reach $10^{-12}$ for DPDM oscillation frequencies at $1-1.5$ GHz, which is
stronger than the cosmic microwave background constraint by about one order of
magnitude. Furthermore, large-scale interferometric arrays like LOFAR and SKA1
telescopes can achieve extraordinary sensitivities for direct DPDM search from
10 MHz to 10 GHz.
|
[
{
"created": "Tue, 12 Jul 2022 18:00:05 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Mar 2023 14:07:04 GMT",
"version": "v2"
}
] |
2023-05-12
|
[
[
"An",
"Haipeng",
""
],
[
"Ge",
"Shuailiang",
""
],
[
"Guo",
"Wen-Qing",
""
],
[
"Huang",
"Xiaoyuan",
""
],
[
"Liu",
"Jia",
""
],
[
"Lu",
"Zhiyao",
""
]
] |
Dark photons can be the ultralight dark matter candidate, interacting with Standard Model particles via kinetic mixing. We propose to search for ultralight dark photon dark matter (DPDM) through the local absorption at different radio telescopes. The local DPDM can induce harmonic oscillations of electrons inside the antenna of radio telescopes. It leads to a monochromatic radio signal and can be recorded by telescope receivers. Using the observation data from the FAST telescope, the upper limit on the kinetic mixing can already reach $10^{-12}$ for DPDM oscillation frequencies at $1-1.5$ GHz, which is stronger than the cosmic microwave background constraint by about one order of magnitude. Furthermore, large-scale interferometric arrays like LOFAR and SKA1 telescopes can achieve extraordinary sensitivities for direct DPDM search from 10 MHz to 10 GHz.
|
hep-ph/9705279
|
Zhang Chen
|
Zhang Chen (Columbia University)
|
Non-Forward and Unequal Mass Virtual Compton Scattering
|
11 pages, RevTex, 3 figures
|
Nucl.Phys. B525 (1998) 369-383
|
10.1016/S0550-3213(98)00226-0
|
CU-TP-835
|
hep-ph
| null |
We discuss the general operator product expansion of a non-forward unequal
mass virtual compton scattering scattering amplitude. We find that the
expansion now should be done in double moments with new moment variables. There
are in the expansion new sets of leading twist operators which have overall
derivatives, and they mix under renormalization. We compute the evolution
kernels from which the anomalous dimensions for these operators can be
extracted. We also obtain the lowest order Wilson Coefficients. In the high
energy limit we find the explicit form of the dominant contributing anomalous
dimensions and solve the resulting renormalization group equation. We find the
same high energy behavior as indicated by the conventional double leading
logarithmic analysis.
|
[
{
"created": "Fri, 9 May 1997 20:07:45 GMT",
"version": "v1"
}
] |
2009-10-30
|
[
[
"Chen",
"Zhang",
"",
"Columbia University"
]
] |
We discuss the general operator product expansion of a non-forward unequal mass virtual compton scattering scattering amplitude. We find that the expansion now should be done in double moments with new moment variables. There are in the expansion new sets of leading twist operators which have overall derivatives, and they mix under renormalization. We compute the evolution kernels from which the anomalous dimensions for these operators can be extracted. We also obtain the lowest order Wilson Coefficients. In the high energy limit we find the explicit form of the dominant contributing anomalous dimensions and solve the resulting renormalization group equation. We find the same high energy behavior as indicated by the conventional double leading logarithmic analysis.
|
1110.4895
|
Linda Carpenter
|
Linda M. Carpenter
|
Higgs Search Constraints on Fourth Generation Scenarios with General
Lepton Sectors
|
7 pages 5 figures
| null | null |
UCI-TR-2011-23
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
I present a general exclusion bound for the Higgs in fourth generation
scenarios with a general lepton sector. Recent Higgs searches in fourth
generation scenarios rule out the entire Higgs mass region between 120 and 600
GeV. That such a large range of Higgs masses are excluded is due to the
presence of extra heavy flavors of quarks, which substantially increase Higgs
production from gluon fusion over the Standard Model rate. However, if heavy
fourth generation neutrinos are less than half of the Higgs mass, they can
dominate the Higgs decay branching fraction, overtaking the standard Higgs to
WW* decay rate. The Higgs mass exclusion in a fourth generation scenario is
shown most generally to be 155-600 GeV, and is highly dependent on the fourth
generation neutrino mixing parameter.
|
[
{
"created": "Fri, 21 Oct 2011 20:09:36 GMT",
"version": "v1"
}
] |
2011-10-25
|
[
[
"Carpenter",
"Linda M.",
""
]
] |
I present a general exclusion bound for the Higgs in fourth generation scenarios with a general lepton sector. Recent Higgs searches in fourth generation scenarios rule out the entire Higgs mass region between 120 and 600 GeV. That such a large range of Higgs masses are excluded is due to the presence of extra heavy flavors of quarks, which substantially increase Higgs production from gluon fusion over the Standard Model rate. However, if heavy fourth generation neutrinos are less than half of the Higgs mass, they can dominate the Higgs decay branching fraction, overtaking the standard Higgs to WW* decay rate. The Higgs mass exclusion in a fourth generation scenario is shown most generally to be 155-600 GeV, and is highly dependent on the fourth generation neutrino mixing parameter.
|
1909.00017
|
Igor Anikin
|
I.V. Anikin, L. Szymanowski
|
Inverse Radon transform and the transverse-momentum dependent functions
|
11 pages, 2 figures, the present version matches the Journal variant
|
Phys. Rev. D 100, 094034 (2019)
|
10.1103/PhysRevD.100.094034
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We revisit the standard representation of the (inverse) Radon transform which
is well-known in the mathematical literature. We extend this representation to
the case involving the parton distributions. We have found the new additional
contribution which is essentially related to the generalized
transverse-momentum dependent parton distribution and double-distribution
functions. We discuss the possible relationship of this term with the Sivers
function.
|
[
{
"created": "Fri, 30 Aug 2019 18:10:41 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Sep 2019 20:12:37 GMT",
"version": "v2"
},
{
"created": "Fri, 15 Nov 2019 13:42:15 GMT",
"version": "v3"
}
] |
2019-12-04
|
[
[
"Anikin",
"I. V.",
""
],
[
"Szymanowski",
"L.",
""
]
] |
We revisit the standard representation of the (inverse) Radon transform which is well-known in the mathematical literature. We extend this representation to the case involving the parton distributions. We have found the new additional contribution which is essentially related to the generalized transverse-momentum dependent parton distribution and double-distribution functions. We discuss the possible relationship of this term with the Sivers function.
|
1109.6014
|
Brooks Thomas
|
Joseph Bramante, Jason Kumar, Brooks Thomas
|
Large Jet Multiplicities and New Physics at the LHC
|
22 pages, ReVTeX, 6 figures, 2 tables. Replaced to match published
version
|
Phys. Rev. D86 (2012) 015014
|
10.1103/PhysRevD.86.015014
|
UH-511-1178-11
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A broad class of scenarios for new physics involving additional
strongly-interacting fields generically predicts signatures at hadron colliders
which consist solely of large numbers of jets and substantial missing
transverse energy. In this work, we investigate the prospects for discovery in
such scenarios using a search strategy in which jet multiplicity and missing
transverse energy are employed as the primary criteria for distinguishing
signal from background. We examine the discovery reach this strategy affords in
an example theory (a simplified supersymmetric model whose low-energy spectrum
consists of a gluino, a light stop, and a light neutralino) and demonstrate
that it frequently exceeds the reach obtained via other, alternative
strategies.
|
[
{
"created": "Tue, 27 Sep 2011 20:00:10 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Oct 2012 19:33:07 GMT",
"version": "v2"
}
] |
2013-05-30
|
[
[
"Bramante",
"Joseph",
""
],
[
"Kumar",
"Jason",
""
],
[
"Thomas",
"Brooks",
""
]
] |
A broad class of scenarios for new physics involving additional strongly-interacting fields generically predicts signatures at hadron colliders which consist solely of large numbers of jets and substantial missing transverse energy. In this work, we investigate the prospects for discovery in such scenarios using a search strategy in which jet multiplicity and missing transverse energy are employed as the primary criteria for distinguishing signal from background. We examine the discovery reach this strategy affords in an example theory (a simplified supersymmetric model whose low-energy spectrum consists of a gluino, a light stop, and a light neutralino) and demonstrate that it frequently exceeds the reach obtained via other, alternative strategies.
|
hep-ph/9905526
|
Sirois
|
Yves Sirois
|
Searches For New Bosons Coupling To e-q Pairs At HERA And Other
Colliders
|
27 pages, 16 figures. Proceedings of the WEIN'98 Symposium (June
1998)
| null | null | null |
hep-ph
| null |
The early observation at HERA of an excess of events compared to the
expectation from the Standard Model in very short distance $e^+p$
deep-inelastic scattering processes has renewed the interest in the search for
new physics which could manifest in electroweak-like interactions. New
preliminary results from the H1 and ZEUS experiments making use of all
available $e^+p$ data are reviewed here, with an emphasis on the search for new
bosons possessing Yukawa couplings to lepton-quark pairs. The sensitivity of
HERA to leptoquarks, and to squarks of R-parity violating supersymmetry, is
confronted to existing indirect constraints from rare and forbidden
semi-leptonic decays, atomic parity violation and neutrinoless double-beta
decay, as well as to direct constraints from LEP and Tevatron colliders. The
HERA and Tevatron colliders are found to offer exciting prospects for new
physics, accessing yet unexplored domains of the mass-coupling plane. Possible
striking manifestation of explicit lepton flavour violation is also discussed.
|
[
{
"created": "Thu, 27 May 1999 23:21:03 GMT",
"version": "v1"
}
] |
2016-09-06
|
[
[
"Sirois",
"Yves",
""
]
] |
The early observation at HERA of an excess of events compared to the expectation from the Standard Model in very short distance $e^+p$ deep-inelastic scattering processes has renewed the interest in the search for new physics which could manifest in electroweak-like interactions. New preliminary results from the H1 and ZEUS experiments making use of all available $e^+p$ data are reviewed here, with an emphasis on the search for new bosons possessing Yukawa couplings to lepton-quark pairs. The sensitivity of HERA to leptoquarks, and to squarks of R-parity violating supersymmetry, is confronted to existing indirect constraints from rare and forbidden semi-leptonic decays, atomic parity violation and neutrinoless double-beta decay, as well as to direct constraints from LEP and Tevatron colliders. The HERA and Tevatron colliders are found to offer exciting prospects for new physics, accessing yet unexplored domains of the mass-coupling plane. Possible striking manifestation of explicit lepton flavour violation is also discussed.
|
hep-ph/9711467
|
Matthias Steinhauser
|
M. Steinhauser (MPI Munich)
|
O(\alpha_s^2) Corrections to Current Correlators
|
3 pages (Latex), 2 figures (Postscript), to appear in the Proceedings
of the International Europhysics Conference on High Energy Physics,
Jerusalem, Israel, 19 - 26 August 1997
| null | null |
MPI/PhT/97-80
|
hep-ph
| null |
In this contribution three-loop QCD corrections to current correlators are
considered. The application of the large momentum procedure, which provides a
systematic expansion in $(m^2/q^2)^n$, allows the computation of terms up to
$n=6$ for the vector and axial-vector correlator and up to $n=4$ for the scalar
and pseudo-scalar correlator. Some physical applications are discussed.
|
[
{
"created": "Tue, 25 Nov 1997 14:06:48 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Steinhauser",
"M.",
"",
"MPI Munich"
]
] |
In this contribution three-loop QCD corrections to current correlators are considered. The application of the large momentum procedure, which provides a systematic expansion in $(m^2/q^2)^n$, allows the computation of terms up to $n=6$ for the vector and axial-vector correlator and up to $n=4$ for the scalar and pseudo-scalar correlator. Some physical applications are discussed.
|
hep-ph/9805383
|
Xuelei Chen
|
Xuelei Chen and Marc Kamionkowski (Physics Department, Columbia
University)
|
Three-Body Annihilation of Neutralinos Below Two-Body Thresholds
|
19 pages, 8 postscript figures, use JHEP.cls
|
JHEP 9807 (1998) 001
|
10.1088/1126-6708/1998/07/001
|
CU-TP-897, CAL-661
|
hep-ph astro-ph hep-ex
| null |
We calculate the cross section for s-wave neutralino annihilation to
three-body final states below the W^+ W^- and t-bar t thresholds. Such
three-body channels may dominate the annihilation cross section if the
neutralino mass is not too much less than m_t and m_W respectively.
Furthermore, because neutrinos produced in these channels are much more
energetic than those from the $b\bar{b}$ or tau^+ tau^- channels, they can
dominate the energetic-neutrino fluxes from neutralino annihilation in the Sun
or Earth far below these thresholds and significantly enhance the neutrino
signal in certain regions of the supersymmetric parameter space.
|
[
{
"created": "Tue, 19 May 1998 23:58:47 GMT",
"version": "v1"
},
{
"created": "Wed, 20 May 1998 00:17:45 GMT",
"version": "v2"
},
{
"created": "Fri, 14 Aug 1998 17:56:21 GMT",
"version": "v3"
}
] |
2009-10-31
|
[
[
"Chen",
"Xuelei",
"",
"Physics Department, Columbia\n University"
],
[
"Kamionkowski",
"Marc",
"",
"Physics Department, Columbia\n University"
]
] |
We calculate the cross section for s-wave neutralino annihilation to three-body final states below the W^+ W^- and t-bar t thresholds. Such three-body channels may dominate the annihilation cross section if the neutralino mass is not too much less than m_t and m_W respectively. Furthermore, because neutrinos produced in these channels are much more energetic than those from the $b\bar{b}$ or tau^+ tau^- channels, they can dominate the energetic-neutrino fluxes from neutralino annihilation in the Sun or Earth far below these thresholds and significantly enhance the neutrino signal in certain regions of the supersymmetric parameter space.
|
0805.2141
|
Ulrich Haisch
|
Ulrich Haisch
|
Anti-B --> X(s) gamma: Standard Model and Beyond
|
8 pages, 2 figures, 1 table, based on talks given at XLIIIrd
Rencontres de Moriond, Electroweak Session, La Thuile, Italy, March 1--8,
2008 and Flavor Physics & CP Violation (FPCP) 2008, National Taiwan
University, Taipei, Taiwan, May 5--9, 2008, v2: minor modifications, typos
corrected, and references updated
| null | null |
MZ-TH/08-14
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a concise review of the recent theoretical progress concerning the
standard model calculation of the inclusive radiative anti-B --> X(s) gamma
decay. Particular attention is thereby devoted to the calculations of the
next-to-next-to-leading order fixed-order O(alpha_s^2) contributions, non-local
O(alpha_s Lambda/m_b) power corrections, and logarithmic-enhanced O(alpha_s^2)
cut-effects to the decay rate. The current status of various beyond the
standard model calculations of the inclusive b --> s gamma mode is also
summarized.
|
[
{
"created": "Wed, 14 May 2008 19:11:14 GMT",
"version": "v1"
},
{
"created": "Sun, 13 Jul 2008 19:36:47 GMT",
"version": "v2"
}
] |
2008-07-13
|
[
[
"Haisch",
"Ulrich",
""
]
] |
We present a concise review of the recent theoretical progress concerning the standard model calculation of the inclusive radiative anti-B --> X(s) gamma decay. Particular attention is thereby devoted to the calculations of the next-to-next-to-leading order fixed-order O(alpha_s^2) contributions, non-local O(alpha_s Lambda/m_b) power corrections, and logarithmic-enhanced O(alpha_s^2) cut-effects to the decay rate. The current status of various beyond the standard model calculations of the inclusive b --> s gamma mode is also summarized.
|
hep-ph/0003152
|
Wayne W. Repko
|
Duane A. Dicus, Kristin Kovner and Wayne W. Repko
|
Photons, neutrinos and large compact space dimensions
|
8 pages, 3 figures LaTeX. Typos corrected
|
Phys.Rev. D62 (2000) 053013
|
10.1103/PhysRevD.62.053013
|
UTEXAS-HEP-00-2, MSUHEP-00310
|
hep-ph
| null |
We compute the contribution of Kaluza-Klein graviton exchange to the cross
section for photon-neutrino scattering. Unlike the usual situation where the
virtual graviton exchange represents a small correction to a leading order
electroweak or strong amplitude, in this case the graviton contribution is of
the same order as the electroweak amplitude, or somewhat larger. Inclusion of
the graviton contribution is not sufficient to allow high energy neutrinos to
scatter from relic neutrinos in processes such as
$\nu\bar{\nu}\to\gamma\gamma$, but the photon-neutrino decoupling temperature
is substantially reduced.
|
[
{
"created": "Wed, 15 Mar 2000 20:59:47 GMT",
"version": "v1"
},
{
"created": "Sat, 6 May 2000 17:15:44 GMT",
"version": "v2"
}
] |
2009-10-31
|
[
[
"Dicus",
"Duane A.",
""
],
[
"Kovner",
"Kristin",
""
],
[
"Repko",
"Wayne W.",
""
]
] |
We compute the contribution of Kaluza-Klein graviton exchange to the cross section for photon-neutrino scattering. Unlike the usual situation where the virtual graviton exchange represents a small correction to a leading order electroweak or strong amplitude, in this case the graviton contribution is of the same order as the electroweak amplitude, or somewhat larger. Inclusion of the graviton contribution is not sufficient to allow high energy neutrinos to scatter from relic neutrinos in processes such as $\nu\bar{\nu}\to\gamma\gamma$, but the photon-neutrino decoupling temperature is substantially reduced.
|
2207.02691
|
Yuming Wang
|
Qin Qin, Yue-Long Shen, Chao Wang, Yu-Ming Wang
|
Deciphering the long-distance penguin contribution to $\bar B_{d, s} \to
\gamma \gamma$ decays
|
7 pages, 2 figures
| null | null | null |
hep-ph hep-ex hep-lat
|
http://creativecommons.org/licenses/by/4.0/
|
We compute for the first time the long-distance penguin contribution to the
double radiative $B$-meson decays due to the purely hadronic operators acting
with the electromagnetic current in the background soft-gluon field from first
field-theoretical principles by introducing a novel subleading $B$-meson
distribution amplitude. The numerically dominant penguin amplitude arises from
the soft-gluon radiation off the light up-quark loop rather than the
counterpart charm-loop effect on account of the peculiar analytical behaviour
of the short-distance hard-collinear function. Importantly the long-distance
up-quark penguin contribution brings about the substantial cancellation of the
known factorizable power correction possessing the same multiplication CKM
parameters, thus enabling $B_{d, \, s} \to \gamma \gamma$ to become new
benchmark probes of physics beyond the Standard Model.
|
[
{
"created": "Wed, 6 Jul 2022 13:55:14 GMT",
"version": "v1"
}
] |
2022-07-07
|
[
[
"Qin",
"Qin",
""
],
[
"Shen",
"Yue-Long",
""
],
[
"Wang",
"Chao",
""
],
[
"Wang",
"Yu-Ming",
""
]
] |
We compute for the first time the long-distance penguin contribution to the double radiative $B$-meson decays due to the purely hadronic operators acting with the electromagnetic current in the background soft-gluon field from first field-theoretical principles by introducing a novel subleading $B$-meson distribution amplitude. The numerically dominant penguin amplitude arises from the soft-gluon radiation off the light up-quark loop rather than the counterpart charm-loop effect on account of the peculiar analytical behaviour of the short-distance hard-collinear function. Importantly the long-distance up-quark penguin contribution brings about the substantial cancellation of the known factorizable power correction possessing the same multiplication CKM parameters, thus enabling $B_{d, \, s} \to \gamma \gamma$ to become new benchmark probes of physics beyond the Standard Model.
|
1404.7839
|
Thomas A. Ryttov
|
Thomas A. Ryttov
|
Vacuum Alignment with more Flavors
|
Coincides with published version. Several new results for an
arbitrary number of flavors. New plot added
|
Phys.Rev. D89 (2014) 116003
|
10.1103/PhysRevD.89.116003
|
CP3-Origins-2014-017 DNRF 90 & DIAS-2014-17
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the alignment of the vacuum in gauge theories with $N_f$ Dirac
fermions transforming according to a complex representation of the gauge group.
The alignment of the vacuum is produced by adding a small mass perturbation to
the theory. We study in detail the $N_f=2,3$ and $4$ case. For $N_f=2$ and
$N_f=3$ we reproduce earlier known results including the Dashen phase with
spontaneous violation of the combined charge conjugation and parity symmetry,
CP. For $N_f=4$ we find regions with and without spontaneous CP violation.
We then generalize to an arbitrary number of flavors. Here it is shown that
at the point where $N_f-1$ flavors are degenerate with positive mass $m>0$ and
the mass of the $N_f$'th flavor becomes negative and equal to $-m$ CP breaks
spontaneously.
|
[
{
"created": "Wed, 30 Apr 2014 19:16:43 GMT",
"version": "v1"
},
{
"created": "Fri, 30 May 2014 13:28:35 GMT",
"version": "v2"
}
] |
2014-06-06
|
[
[
"Ryttov",
"Thomas A.",
""
]
] |
We study the alignment of the vacuum in gauge theories with $N_f$ Dirac fermions transforming according to a complex representation of the gauge group. The alignment of the vacuum is produced by adding a small mass perturbation to the theory. We study in detail the $N_f=2,3$ and $4$ case. For $N_f=2$ and $N_f=3$ we reproduce earlier known results including the Dashen phase with spontaneous violation of the combined charge conjugation and parity symmetry, CP. For $N_f=4$ we find regions with and without spontaneous CP violation. We then generalize to an arbitrary number of flavors. Here it is shown that at the point where $N_f-1$ flavors are degenerate with positive mass $m>0$ and the mass of the $N_f$'th flavor becomes negative and equal to $-m$ CP breaks spontaneously.
|
1012.5501
|
Norimi Yokozaki
|
Motoi Endo and Norimi Yokozaki
|
Large CP Violation in B_s Meson Mixing with EDM constraint in
Supersymmetry
|
20 pages, 5 figures
|
JHEP 1103:130,2011
|
10.1007/JHEP03(2011)130
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Motivated by the recent measurement of the like-sign dimuon charge asymmetry,
we investigate anomalous CP violation in the B_s- bar{B}_s mixing within the
supersymmetry. We show that when gluino diagrams dominate supersymmetry
contributions, it is very difficult to realize a large B_s- bar{B}_s mixing
phase under the constraint from electric dipole moments barring cancellations.
This constraint can be ameliorated by supposing superparticles decoupled. In
this limit, we find that it is possible to achieve the large CP asymmetry, and
the branching ratio of B_s -> mu^+ mu^- tends to become sizable.
|
[
{
"created": "Sun, 26 Dec 2010 08:44:38 GMT",
"version": "v1"
}
] |
2011-03-31
|
[
[
"Endo",
"Motoi",
""
],
[
"Yokozaki",
"Norimi",
""
]
] |
Motivated by the recent measurement of the like-sign dimuon charge asymmetry, we investigate anomalous CP violation in the B_s- bar{B}_s mixing within the supersymmetry. We show that when gluino diagrams dominate supersymmetry contributions, it is very difficult to realize a large B_s- bar{B}_s mixing phase under the constraint from electric dipole moments barring cancellations. This constraint can be ameliorated by supposing superparticles decoupled. In this limit, we find that it is possible to achieve the large CP asymmetry, and the branching ratio of B_s -> mu^+ mu^- tends to become sizable.
|
hep-ph/9509410
|
Carlos Savoy
|
E. Dudas, S. Pokorski and C.A. Savoy
|
Soft scalar masses in supergravity with horizontal U(1)_X gauge symmetry
|
15 pages, LaTeX, Eq.(16) corrected
|
Phys.Lett.B369:255-261,1996
|
10.1016/0370-2693(95)01536-1
|
Saclay T95/094, MPI-PTh 95-89
|
hep-ph
| null |
In supergravity with modular invariance and horizontal $U(1)_X$ gauge
symmetry there is a relation between modular weights and $U(1)_X$ charges. The
soft scalar masses are then strongly correlated with Yukawa matrices. The
implications for FCNC are discussed.
|
[
{
"created": "Thu, 28 Sep 1995 14:17:37 GMT",
"version": "v1"
},
{
"created": "Fri, 29 Sep 1995 18:43:44 GMT",
"version": "v2"
}
] |
2010-04-21
|
[
[
"Dudas",
"E.",
""
],
[
"Pokorski",
"S.",
""
],
[
"Savoy",
"C. A.",
""
]
] |
In supergravity with modular invariance and horizontal $U(1)_X$ gauge symmetry there is a relation between modular weights and $U(1)_X$ charges. The soft scalar masses are then strongly correlated with Yukawa matrices. The implications for FCNC are discussed.
|
2004.02255
|
Marek Gazdzicki
|
Marek Gazdzicki, Mark Gorenstein, Peter Seyboth
|
Brief history of the search for critical structures in heavy-ion
collisions
|
38 pages, 17 figures
| null |
10.5506/APhysPolB.51.1033
| null |
hep-ph nucl-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The paper briefly presents history, status, and plans of the search for the
critical structures - the onset of fireball, the onset of deconfinement, and
the deconfinement critical point - in high energy nucleus-nucleus collisions.
First, the basic ideas are introduced, the history of the observation of
strongly interacting matter in heavy ion collisions is reviewed, and the path
towards the quark-gluon plasma discovery is sketched. Then the status of the
search for critical structures is discussed - the discovery of the onset of
deconfinement, indications for the onset of fireball, and still inconclusive
results concerning the deconfinement critical point. Finally, an attempt to
formulate priorities for future measurements - charm quarks vs the onset of
deconfinement and detailed study of the onset of fireball - closes the paper.
|
[
{
"created": "Sun, 5 Apr 2020 17:02:59 GMT",
"version": "v1"
}
] |
2020-07-15
|
[
[
"Gazdzicki",
"Marek",
""
],
[
"Gorenstein",
"Mark",
""
],
[
"Seyboth",
"Peter",
""
]
] |
The paper briefly presents history, status, and plans of the search for the critical structures - the onset of fireball, the onset of deconfinement, and the deconfinement critical point - in high energy nucleus-nucleus collisions. First, the basic ideas are introduced, the history of the observation of strongly interacting matter in heavy ion collisions is reviewed, and the path towards the quark-gluon plasma discovery is sketched. Then the status of the search for critical structures is discussed - the discovery of the onset of deconfinement, indications for the onset of fireball, and still inconclusive results concerning the deconfinement critical point. Finally, an attempt to formulate priorities for future measurements - charm quarks vs the onset of deconfinement and detailed study of the onset of fireball - closes the paper.
|
2003.13929
|
Eibun Senaha
|
Koichi Funakubo, Eibun Senaha
|
Magnetic mass effect on the sphaleron energy
|
5 pages, 2 figures; v2: some clarifications and references added,
version accepted for publication as a Rapid Communication in PRD
|
Phys. Rev. D 102, 041701 (2020)
|
10.1103/PhysRevD.102.041701
| null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We elucidate a magnetic mass effect on a sphaleron energy that is crucial for
baryon number preservation needed for successful electroweak baryogenesis. It
is found that the sphaleron energy increases in response to the magnetic mass.
As an application, we study the sphaleron energy and electroweak phase
transition with the magnetic mass in a two-Higgs-doublet model. Although the
magnetic mass can screen the gauge boson loops, it relaxes a baryon number
preservation criterion more effectively, broadening the baryogenesis-possible
region. Our findings would be universal in any new physics models as long as
the gauge sector is common to the standard model.
|
[
{
"created": "Tue, 31 Mar 2020 03:07:21 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Aug 2020 03:03:21 GMT",
"version": "v2"
}
] |
2020-08-26
|
[
[
"Funakubo",
"Koichi",
""
],
[
"Senaha",
"Eibun",
""
]
] |
We elucidate a magnetic mass effect on a sphaleron energy that is crucial for baryon number preservation needed for successful electroweak baryogenesis. It is found that the sphaleron energy increases in response to the magnetic mass. As an application, we study the sphaleron energy and electroweak phase transition with the magnetic mass in a two-Higgs-doublet model. Although the magnetic mass can screen the gauge boson loops, it relaxes a baryon number preservation criterion more effectively, broadening the baryogenesis-possible region. Our findings would be universal in any new physics models as long as the gauge sector is common to the standard model.
|
hep-ph/0406201
|
Andrea Dainese
|
A. Dainese (Padova U. and INFN), C. Loizides (Frankfurt U., Inst.
Kernphys.), G. Paic (Mexico City U., ICN)
|
Leading-particle suppression in high energy nucleus-nucleus collisions
|
28 pages, 14 figures, final version, accepted by Eur. Phys. J. C
|
Eur.Phys.J.C38:461-474,2005
|
10.1140/epjc/s2004-02077-x
| null |
hep-ph nucl-ex nucl-th
| null |
Parton energy loss effects in heavy-ion collisions are studied with the Monte
Carlo program PQM (Parton Quenching Model) constructed using the BDMPS
quenching weights and a realistic collision geometry. The merit of the approach
is that it contains only one free parameter that is tuned to the high-pt
nuclear modification factor measured in central Au-Au collisions at sqrt{s_NN}
= 200 GeV. Once tuned, the model is coherently applied to all the high-pt
observables at 200 GeV: the centrality evolution of the nuclear modification
factor, the suppression of the away-side jet-like correlations, and the
azimuthal anisotropies for these observables. Predictions for the
leading-particle suppression at nucleon-nucleon centre-of-mass energies of 62.4
and 5500 GeV are calculated. The limits of the eikonal approximation in the
BDMPS approach, when applied to finite-energy partons, are discussed.
|
[
{
"created": "Fri, 18 Jun 2004 09:36:12 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Jul 2004 11:22:41 GMT",
"version": "v2"
},
{
"created": "Thu, 4 Nov 2004 09:21:43 GMT",
"version": "v3"
}
] |
2008-11-26
|
[
[
"Dainese",
"A.",
"",
"Padova U. and INFN"
],
[
"Loizides",
"C.",
"",
"Frankfurt U., Inst.\n Kernphys."
],
[
"Paic",
"G.",
"",
"Mexico City U., ICN"
]
] |
Parton energy loss effects in heavy-ion collisions are studied with the Monte Carlo program PQM (Parton Quenching Model) constructed using the BDMPS quenching weights and a realistic collision geometry. The merit of the approach is that it contains only one free parameter that is tuned to the high-pt nuclear modification factor measured in central Au-Au collisions at sqrt{s_NN} = 200 GeV. Once tuned, the model is coherently applied to all the high-pt observables at 200 GeV: the centrality evolution of the nuclear modification factor, the suppression of the away-side jet-like correlations, and the azimuthal anisotropies for these observables. Predictions for the leading-particle suppression at nucleon-nucleon centre-of-mass energies of 62.4 and 5500 GeV are calculated. The limits of the eikonal approximation in the BDMPS approach, when applied to finite-energy partons, are discussed.
|
hep-ph/0512032
|
Stefan Recksiegel
|
Andrzej J. Buras, Robert Fleischer, Stefan Recksiegel, Felix Schwab
|
New Aspects of B -> pi pi, pi K and their Implications for Rare Decays
|
Two references added, to appear in the European Physical Journal C
|
Eur.Phys.J.C45:701-710,2006
|
10.1140/epjc/s2005-02469-4
|
CERN-PH-TH/2005-241, TUM-HEP-610/05, MPP-2005-156
|
hep-ph
| null |
We analyse the B -> pi pi, pi K modes in the light of the most recent
B-factory data, and obtain the following new results: (i) the B0 -> pi+ pi-,
pi- K+ modes prefer gamma=(74+-6)deg, which - together with |V_ub/V_cb| -
allows us to determine the ``true'' unitarity triangle and to search for
CP-violating new-physics contributions to B0_d-\bar B0_d mixing; (ii) the B ->
pi K puzzle reflected in particular by the low experimental value of the ratio
R_n of the neutral B -> pi K rates persists and still favours new physics in
the electroweak penguin sector with a new CP-violating phase phi ~ -90deg,
although now also phi ~ +90deg can bring us rather close to the data; (iii) the
mixing-induced B0 -> pi0 K_S CP asymmetry is a sensitive probe of the sign of
this phase, and would currently favour phi ~ +90deg, as well as the direct CP
asymmetry of B+- -> pi0 K+-, which suffers, however, from large hadronic
uncertainties; (iv) we investigate the sensitivity of our B -> pi K analysis to
large non-factorizable SU(3)-breaking effects and find that their impact is
surprisingly small so that it is indeed exciting to speculate on new physics;
(v) assuming that new physics enters through Z0 penguins, we study the
interplay between B -> pi K and rare B, K decays and point out that the most
recent B-factory constraints for the latter have interesting implications,
bringing us to a few scenarios for the future evolution of the data, where also
the mixing-induced CP violation in B0 -> pi0 K_S plays a prominent role.
|
[
{
"created": "Fri, 2 Dec 2005 13:18:04 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Dec 2005 14:52:11 GMT",
"version": "v2"
}
] |
2009-01-07
|
[
[
"Buras",
"Andrzej J.",
""
],
[
"Fleischer",
"Robert",
""
],
[
"Recksiegel",
"Stefan",
""
],
[
"Schwab",
"Felix",
""
]
] |
We analyse the B -> pi pi, pi K modes in the light of the most recent B-factory data, and obtain the following new results: (i) the B0 -> pi+ pi-, pi- K+ modes prefer gamma=(74+-6)deg, which - together with |V_ub/V_cb| - allows us to determine the ``true'' unitarity triangle and to search for CP-violating new-physics contributions to B0_d-\bar B0_d mixing; (ii) the B -> pi K puzzle reflected in particular by the low experimental value of the ratio R_n of the neutral B -> pi K rates persists and still favours new physics in the electroweak penguin sector with a new CP-violating phase phi ~ -90deg, although now also phi ~ +90deg can bring us rather close to the data; (iii) the mixing-induced B0 -> pi0 K_S CP asymmetry is a sensitive probe of the sign of this phase, and would currently favour phi ~ +90deg, as well as the direct CP asymmetry of B+- -> pi0 K+-, which suffers, however, from large hadronic uncertainties; (iv) we investigate the sensitivity of our B -> pi K analysis to large non-factorizable SU(3)-breaking effects and find that their impact is surprisingly small so that it is indeed exciting to speculate on new physics; (v) assuming that new physics enters through Z0 penguins, we study the interplay between B -> pi K and rare B, K decays and point out that the most recent B-factory constraints for the latter have interesting implications, bringing us to a few scenarios for the future evolution of the data, where also the mixing-induced CP violation in B0 -> pi0 K_S plays a prominent role.
|
hep-ph/9601275
|
Erwin Mirkes
|
Markus Finkemeier and Erwin Mirkes
|
The Scalar Contribution to $\tau \to K \pi \nu_\tau$
|
16 pages, Latex, uses epsfig.sty, 4 figures The complete paper,
including figures, is also available via anonymous ftp at
ftp://www-ttp.physik.uni-karlsruhe.de/ , or via www at
http://www-ttp.physik.uni-karlsruhe.de/cgi-bin/preprints/
|
Z.Phys. C72 (1996) 619-626
|
10.1007/BF02909193
|
TTP95-44, HUTP-95/A050
|
hep-ph
| null |
We consider the scalar form factor in $\tau \to K\pi \nu_\tau$ decays. It
receives contributions both from the scalar resonance $K_0^*(1430)$ and from
the scalar projection of off-shell vector resonances. We construct a model for
the hadronic current which includes the vector resonances $K^*(892)$ and
$K^*(1410)$ and the scalar resonance $K_0^*(1430)$. The parameters of the model
are fixed by matching to the $O(p^4)$ predictions of chiral perturbation
theory. Suitable angular correlations of the $K\pi$ system allow for a model
independent separation of the vector and scalar form factor. Numerical results
for the relevant structure functions are presented.
|
[
{
"created": "Tue, 16 Jan 1996 10:27:11 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Finkemeier",
"Markus",
""
],
[
"Mirkes",
"Erwin",
""
]
] |
We consider the scalar form factor in $\tau \to K\pi \nu_\tau$ decays. It receives contributions both from the scalar resonance $K_0^*(1430)$ and from the scalar projection of off-shell vector resonances. We construct a model for the hadronic current which includes the vector resonances $K^*(892)$ and $K^*(1410)$ and the scalar resonance $K_0^*(1430)$. The parameters of the model are fixed by matching to the $O(p^4)$ predictions of chiral perturbation theory. Suitable angular correlations of the $K\pi$ system allow for a model independent separation of the vector and scalar form factor. Numerical results for the relevant structure functions are presented.
|
2005.06080
|
Hai-Yang Cheng
|
Hai-Yang Cheng
|
CP Violation in $B^\pm\to \rho^0\pi^\pm$ and $B^\pm\to \sigma\pi^\pm$
Decays
|
11 pages
| null | null | null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The decay amplitude of $B^+\to \pi^+\pi^-\pi^+$ in the Dalitz plot has been
analyzed by the LHCb using three different approaches for the $S$-wave
component. It was found that the mode with $\sigma$ (or $f_0(500)$) exhibited a
CP asymmetry of 15\% in the isobar model, whereas the $f_2(1270)$ mode had a
40\% asymmetry. On the contrary, CP asymmetry for the dominant quasi-two-body
decay $B^-\to\rho^0\pi^-$ was found to be consistent with zero in all three
approaches, while all the existing theoretical predictions lead to a negative
CP asymmetry ranging from $-7\%$ to $-45\%$. We show that the nearly vanishing
CP violation in $B^-\to\rho^0\pi^-$ is understandable in the framework of QCD
factorization (QCDF). It arises from the $1/m_b$ power corrections to the
penguin amplitudes due to penguin annihilations and to the color-suppressed
tree amplitude due to hard spectator interactions. Penguin annihilation and
hard spectator interactions contribute destructively to
$A_{CP}(B^-\to\rho^0\pi^-)$ to render it consistent with zero. The branching
fraction and CP asymmetry in $B^-\to\sigma/f_0(500)\pi^-$ are investigated in
QCDF with results in agreement with experiment.
|
[
{
"created": "Tue, 12 May 2020 22:40:33 GMT",
"version": "v1"
}
] |
2020-05-14
|
[
[
"Cheng",
"Hai-Yang",
""
]
] |
The decay amplitude of $B^+\to \pi^+\pi^-\pi^+$ in the Dalitz plot has been analyzed by the LHCb using three different approaches for the $S$-wave component. It was found that the mode with $\sigma$ (or $f_0(500)$) exhibited a CP asymmetry of 15\% in the isobar model, whereas the $f_2(1270)$ mode had a 40\% asymmetry. On the contrary, CP asymmetry for the dominant quasi-two-body decay $B^-\to\rho^0\pi^-$ was found to be consistent with zero in all three approaches, while all the existing theoretical predictions lead to a negative CP asymmetry ranging from $-7\%$ to $-45\%$. We show that the nearly vanishing CP violation in $B^-\to\rho^0\pi^-$ is understandable in the framework of QCD factorization (QCDF). It arises from the $1/m_b$ power corrections to the penguin amplitudes due to penguin annihilations and to the color-suppressed tree amplitude due to hard spectator interactions. Penguin annihilation and hard spectator interactions contribute destructively to $A_{CP}(B^-\to\rho^0\pi^-)$ to render it consistent with zero. The branching fraction and CP asymmetry in $B^-\to\sigma/f_0(500)\pi^-$ are investigated in QCDF with results in agreement with experiment.
|
hep-ph/0210387
|
Carl Shakin
|
Bing He, Hu Li, C. M. Shakin, and Qing Sun
|
Calculation of the Pseudoscalar-Isoscalar Hadronic Current Correlation
Functions of the Quark-Gluon Plasma
|
20 pages, 10 figures, Revtex4
|
Phys.Rev. D67 (2003) 014022
|
10.1103/PhysRevD.67.014022
|
BCCNT: 10/01/316
|
hep-ph hep-lat
| null |
We report the results of calculations of pseudoscalar-isoscalar hadronic
current correlators using the Nambu--Jona-Lasinio model and the real-time
finite-temperature formalism. Results are presented for the temperatures range
1.2 $\leq T/T_c\leq$ 6.0, where $T_c$ is the temperature of the
confinement-deconfinement transition, which we take to be $T_c=170$ MeV. Two
important resonant features are seen in our calculations. In order to
understand the origin of these resonances, we have performed relativistic
random phase approximation (RPA)calculations of the temperature-dependent
spectrum of the $\eta$ mesons for $T<T_c$. For the RPA calculations, use is
made of a simple model in which we introduce temperature- dependent constituent
quark masses calculated in a mean-field approximation and a
temperature-dependent confining interaction whose form is motivated by recent
studies made using lattice simulations of QCD with dynamical quarks. We also
introduce temperature-dependent coupling constants in our generalized NJL
model. Our motivation in the latter case is the simulation of the approach to a
weakly interacting system at high temperatures. We present some evidence that
supports our use of temperature-dependent coupling constants for the NJL model.
We suggest that our results may be of interest to researchers who use lattice
simulations of QCD to obtain temperature dependent spectral functions for
various hadronic current correlation functions.
|
[
{
"created": "Mon, 28 Oct 2002 18:37:06 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Nov 2002 17:13:21 GMT",
"version": "v2"
}
] |
2009-11-07
|
[
[
"He",
"Bing",
""
],
[
"Li",
"Hu",
""
],
[
"Shakin",
"C. M.",
""
],
[
"Sun",
"Qing",
""
]
] |
We report the results of calculations of pseudoscalar-isoscalar hadronic current correlators using the Nambu--Jona-Lasinio model and the real-time finite-temperature formalism. Results are presented for the temperatures range 1.2 $\leq T/T_c\leq$ 6.0, where $T_c$ is the temperature of the confinement-deconfinement transition, which we take to be $T_c=170$ MeV. Two important resonant features are seen in our calculations. In order to understand the origin of these resonances, we have performed relativistic random phase approximation (RPA)calculations of the temperature-dependent spectrum of the $\eta$ mesons for $T<T_c$. For the RPA calculations, use is made of a simple model in which we introduce temperature- dependent constituent quark masses calculated in a mean-field approximation and a temperature-dependent confining interaction whose form is motivated by recent studies made using lattice simulations of QCD with dynamical quarks. We also introduce temperature-dependent coupling constants in our generalized NJL model. Our motivation in the latter case is the simulation of the approach to a weakly interacting system at high temperatures. We present some evidence that supports our use of temperature-dependent coupling constants for the NJL model. We suggest that our results may be of interest to researchers who use lattice simulations of QCD to obtain temperature dependent spectral functions for various hadronic current correlation functions.
|
1606.04084
|
Kirtiman Ghosh
|
Debajyoti Choudhury and Kirtiman Ghosh
|
Bounds on Universal Extra Dimension from LHC Run I and II data
|
6 pages, 3 figures
| null |
10.1016/j.physletb.2016.10.010
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss the collider bounds on minimal Universal Extra Dimension (mUED)
model from LHC Run-I and II data. The phenomenology of mUED is determined by
only two parameters namely, the compactification scale ($R^{-1}$) of the extra
dimension and cutoff scale ($\Lambda$) of the theory. The characteristic
feature of mUED is the occurrence of nearly degenerate mass spectrum for the
Kaluza-Klein (KK) particles and hence, soft leptons, soft jets at the collider
experiments. The degree of degeneracy of KK-mass spectrum crucially depends on
$\Lambda$. The strongest direct bound on $R^{-1}$ ($\sim $950 GeV for large
$\Lambda$) arises from a search for a pair of soft dimuons at the Large Hadron
Collider (LHC) experiment with 8 TeV center-of-mass energy and $20~{\rm
fb}^{-1}$ integrated luminosity. However, for small $\Lambda$ and hence, small
splitting within the first KK-level, the bounds from the dimuon channel is
rather weak. On the other hand, the discovery of 126 GeV Higgs boson demands
small $\Lambda$ to prevent the scalar potential form being unbounded from
below. We discuss LHC monojet searches as a probe of low $\Lambda$ region of
mUED parameter space. We also compute bounds on the mUED parameter space from
13 TeV multijets results.
|
[
{
"created": "Mon, 13 Jun 2016 19:54:03 GMT",
"version": "v1"
}
] |
2016-11-23
|
[
[
"Choudhury",
"Debajyoti",
""
],
[
"Ghosh",
"Kirtiman",
""
]
] |
We discuss the collider bounds on minimal Universal Extra Dimension (mUED) model from LHC Run-I and II data. The phenomenology of mUED is determined by only two parameters namely, the compactification scale ($R^{-1}$) of the extra dimension and cutoff scale ($\Lambda$) of the theory. The characteristic feature of mUED is the occurrence of nearly degenerate mass spectrum for the Kaluza-Klein (KK) particles and hence, soft leptons, soft jets at the collider experiments. The degree of degeneracy of KK-mass spectrum crucially depends on $\Lambda$. The strongest direct bound on $R^{-1}$ ($\sim $950 GeV for large $\Lambda$) arises from a search for a pair of soft dimuons at the Large Hadron Collider (LHC) experiment with 8 TeV center-of-mass energy and $20~{\rm fb}^{-1}$ integrated luminosity. However, for small $\Lambda$ and hence, small splitting within the first KK-level, the bounds from the dimuon channel is rather weak. On the other hand, the discovery of 126 GeV Higgs boson demands small $\Lambda$ to prevent the scalar potential form being unbounded from below. We discuss LHC monojet searches as a probe of low $\Lambda$ region of mUED parameter space. We also compute bounds on the mUED parameter space from 13 TeV multijets results.
|
2304.11142
|
Yingsheng Huang
|
Feng Feng, Yingsheng Huang, Yu Jia, Wen-Long Sang, De-Shan Yang and
Jia-Yue Zhang
|
Inclusive production of fully-charmed tetraquarks at LHC
|
12 pages, 5 figures, 2 tables. SDCs in .m attachment
| null | null | null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The $X(6900)$ resonance, originally discovered by the \texttt{LHCb}
collaboration and later confirmed by both \texttt{ATLAS} and \texttt{CMS}
experiments, has sparked broad interests in the fully-charmed tetraquark
states. Relative to the mass spectra and decay properties of fully-heavy
tetraquarks, our knowledge on their production mechanism is still rather
limited. In this work we investigate the inclusive production of fully-charmed
$S$-wave tetraquarks at \texttt{LHC} within the nonrelativistic QCD (NRQCD)
factorization framework. The partonic cross sections are computed at lowest
order in $\alpha_s$ and velocity, while the long-distance NRQCD matrix elements
are estimated from phenomenological potential models. We predict the
differential $p_T$ spectra of various fully-charmed $S$-wave tetraquarks at the
\texttt{LHC}, and compare with the results predicted from the fragmentation
mechanism at large $p_T$ end.
|
[
{
"created": "Fri, 21 Apr 2023 17:32:39 GMT",
"version": "v1"
}
] |
2023-04-25
|
[
[
"Feng",
"Feng",
""
],
[
"Huang",
"Yingsheng",
""
],
[
"Jia",
"Yu",
""
],
[
"Sang",
"Wen-Long",
""
],
[
"Yang",
"De-Shan",
""
],
[
"Zhang",
"Jia-Yue",
""
]
] |
The $X(6900)$ resonance, originally discovered by the \texttt{LHCb} collaboration and later confirmed by both \texttt{ATLAS} and \texttt{CMS} experiments, has sparked broad interests in the fully-charmed tetraquark states. Relative to the mass spectra and decay properties of fully-heavy tetraquarks, our knowledge on their production mechanism is still rather limited. In this work we investigate the inclusive production of fully-charmed $S$-wave tetraquarks at \texttt{LHC} within the nonrelativistic QCD (NRQCD) factorization framework. The partonic cross sections are computed at lowest order in $\alpha_s$ and velocity, while the long-distance NRQCD matrix elements are estimated from phenomenological potential models. We predict the differential $p_T$ spectra of various fully-charmed $S$-wave tetraquarks at the \texttt{LHC}, and compare with the results predicted from the fragmentation mechanism at large $p_T$ end.
|
hep-ph/0612098
|
Andreas Ringwald
|
Markus Ahlers, Holger Gies, Joerg Jaeckel, Andreas Ringwald
|
On the Particle Interpretation of the PVLAS Data: Neutral versus Charged
Particles
|
14 pages, 6 figures, revtex4
|
Phys.Rev.D75:035011,2007
|
10.1103/PhysRevD.75.035011
|
DESY 06-221, DCPT/06/182, IPPP/06/91
|
hep-ph
| null |
Recently the PVLAS collaboration reported the observation of a rotation of
linearly polarized laser light induced by a transverse magnetic field - a
signal being unexpected within standard QED. Two mechanisms have been proposed
to explain this result: production of a single (pseudo-)scalar particle coupled
to two photons or pair production of light millicharged particles. In this
work, we study how the different scenarios can be distinguished. We summarize
the expected signals for vacuum magnetic dichroism (rotation) and birefringence
(ellipticity) for the different types of particles - including new results for
the case of millicharged scalars. The sign of the rotation and ellipticity
signals as well as their dependencies on experimental parameters, such as the
strength of the magnetic field and the wavelength of the laser, can be used to
obtain information about the quantum numbers of the particle candidates and to
discriminate between the different scenarios. We perform a statistical analysis
of all available data resulting in strongly restricted regions in the parameter
space of all scenarios. These regions suggest clear target regions for upcoming
experimental tests. As an illustration, we use preliminary PVLAS data to
demonstrate that near future data may already rule out some of these scenarios.
|
[
{
"created": "Fri, 8 Dec 2006 16:28:33 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Ahlers",
"Markus",
""
],
[
"Gies",
"Holger",
""
],
[
"Jaeckel",
"Joerg",
""
],
[
"Ringwald",
"Andreas",
""
]
] |
Recently the PVLAS collaboration reported the observation of a rotation of linearly polarized laser light induced by a transverse magnetic field - a signal being unexpected within standard QED. Two mechanisms have been proposed to explain this result: production of a single (pseudo-)scalar particle coupled to two photons or pair production of light millicharged particles. In this work, we study how the different scenarios can be distinguished. We summarize the expected signals for vacuum magnetic dichroism (rotation) and birefringence (ellipticity) for the different types of particles - including new results for the case of millicharged scalars. The sign of the rotation and ellipticity signals as well as their dependencies on experimental parameters, such as the strength of the magnetic field and the wavelength of the laser, can be used to obtain information about the quantum numbers of the particle candidates and to discriminate between the different scenarios. We perform a statistical analysis of all available data resulting in strongly restricted regions in the parameter space of all scenarios. These regions suggest clear target regions for upcoming experimental tests. As an illustration, we use preliminary PVLAS data to demonstrate that near future data may already rule out some of these scenarios.
|
1409.4311
|
Vladimir Braun M
|
S.S. Agaev, V.M. Braun, N. Offen, F.A. Porkert, A. Sch\"afer
|
Transition form factors $\gamma^*\gamma\to\eta$ and
$\gamma^*\gamma\to\eta'$ in QCD
|
23 pages, 6 figures
|
Phys. Rev. D 90, 074019 (2014)
|
10.1103/PhysRevD.90.074019
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We update the theoretical framework for the QCD calculation of transition
form factors $\gamma^*\gamma\to\eta$ and $\gamma^*\gamma\to\eta'$ at large
photon virtualities including full next-to-leading order analysis of
perturbative corrections, the charm quark contribution, and taking into account
SU(3)-flavor breaking effects and the axial anomaly contributions to the
power-suppressed twist-four distribution amplitudes. The numerical analysis of
the existing experimental data is performed with these improvements.
|
[
{
"created": "Mon, 15 Sep 2014 16:24:15 GMT",
"version": "v1"
}
] |
2014-10-22
|
[
[
"Agaev",
"S. S.",
""
],
[
"Braun",
"V. M.",
""
],
[
"Offen",
"N.",
""
],
[
"Porkert",
"F. A.",
""
],
[
"Schäfer",
"A.",
""
]
] |
We update the theoretical framework for the QCD calculation of transition form factors $\gamma^*\gamma\to\eta$ and $\gamma^*\gamma\to\eta'$ at large photon virtualities including full next-to-leading order analysis of perturbative corrections, the charm quark contribution, and taking into account SU(3)-flavor breaking effects and the axial anomaly contributions to the power-suppressed twist-four distribution amplitudes. The numerical analysis of the existing experimental data is performed with these improvements.
|
2304.07259
|
Manash Dey
|
Manash Dey and Subhankar Roy
|
A Realistic Neutrino mixing scheme arising from $A_4$ symmetry
| null |
Europhysics Letters, Volume 147, Number 1 (2024) 14002
|
10.1209/0295-5075/ad57eb
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We propose a unique lepton mixing scheme and its association with an exact
hierarchy-philic neutrino mass matrix texture in the light of Type-I+Type-II
seesaw mechanism under the framework of $A_4 \times Z_{10}$ discrete flavour
symmetry. The proposed model successfully predicts the normal ordering of
neutrino masses and the two Majorana phases. Additionally, the analysis extends
to the effective Majorana neutrino mass, in the context of neutrinoless double
beta\,($0\nu\beta\beta$)-decay.
|
[
{
"created": "Fri, 14 Apr 2023 17:12:28 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Nov 2023 09:26:17 GMT",
"version": "v2"
},
{
"created": "Tue, 23 Jul 2024 08:26:41 GMT",
"version": "v3"
}
] |
2024-07-24
|
[
[
"Dey",
"Manash",
""
],
[
"Roy",
"Subhankar",
""
]
] |
We propose a unique lepton mixing scheme and its association with an exact hierarchy-philic neutrino mass matrix texture in the light of Type-I+Type-II seesaw mechanism under the framework of $A_4 \times Z_{10}$ discrete flavour symmetry. The proposed model successfully predicts the normal ordering of neutrino masses and the two Majorana phases. Additionally, the analysis extends to the effective Majorana neutrino mass, in the context of neutrinoless double beta\,($0\nu\beta\beta$)-decay.
|
1209.0755
|
Peter Stoffer
|
Gilberto Colangelo, Emilie Passemar, Peter Stoffer
|
A Dispersive Treatment of $K_{\ell4}$ Decays
|
4 pages, talk given by PS at MESON2012 - 12th International Workshop
on Meson Production, Properties and Interaction, Krak\'ow, Poland, 31 May - 5
June 2012
| null |
10.1051/epjconf/20123705006
|
LA-UR-12-23703
|
hep-ph hep-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
$K_{\ell4}$ are for several reasons an especially interesting decay channel
of $K$ mesons: $K_{\ell4}$ decays allow an accurate measurement of a
combination of $S$-wave $\pi\pi$ scattering lengths, one form factor of the
decay is connected to the chiral anomaly and the decay is the best source for
the determination of some low energy constants of ChPT. We present a dispersive
approach to $K_{\ell4}$ decays, which takes rescattering effects fully into
account. Some fits to NA48/2 and E865 measurements and results of the matching
to ChPT are shown.
|
[
{
"created": "Tue, 4 Sep 2012 19:49:58 GMT",
"version": "v1"
}
] |
2017-08-23
|
[
[
"Colangelo",
"Gilberto",
""
],
[
"Passemar",
"Emilie",
""
],
[
"Stoffer",
"Peter",
""
]
] |
$K_{\ell4}$ are for several reasons an especially interesting decay channel of $K$ mesons: $K_{\ell4}$ decays allow an accurate measurement of a combination of $S$-wave $\pi\pi$ scattering lengths, one form factor of the decay is connected to the chiral anomaly and the decay is the best source for the determination of some low energy constants of ChPT. We present a dispersive approach to $K_{\ell4}$ decays, which takes rescattering effects fully into account. Some fits to NA48/2 and E865 measurements and results of the matching to ChPT are shown.
|
hep-ph/9210258
|
Ken-ichiro Aoki
|
Kenichiro Aoki, Santiago Peris
|
Non--perturbative evidence for non--decoupling of heavy fermions
|
10pp, harvmac, figures not included, /UCLA/92/TEP/34,UAB--FT--291
|
Phys.Rev.Lett.70:1743-1746,1993
|
10.1103/PhysRevLett.70.1743
| null |
hep-ph
| null |
We investigate, using a $1/N$ expansion, the behavior of a parameter in the
scalar--fermion sector of the standard model that shows perturbative
non--decoupling as the fermion becomes heavy. This low energy parameter is
related to the $S$ parameter defined through the $W_3-B$ vacuum polarization
tensor. We obtain the leading $1/N$ contribution to this parameter that, if
expanded perturbatively, collapses to its constant one--loop result; remarkably
all the higher--order terms in the series vanish. Non--perturbatively, however,
we find that as the mass of the fermion approaches the built--in cutoff scale
of the theory --- the triviality scale --- the parameter is highly dependent on
the implementation of the cutoff; it is non--universal, and shows
non--decoupling.
|
[
{
"created": "Fri, 23 Oct 1992 00:40:30 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Aoki",
"Kenichiro",
""
],
[
"Peris",
"Santiago",
""
]
] |
We investigate, using a $1/N$ expansion, the behavior of a parameter in the scalar--fermion sector of the standard model that shows perturbative non--decoupling as the fermion becomes heavy. This low energy parameter is related to the $S$ parameter defined through the $W_3-B$ vacuum polarization tensor. We obtain the leading $1/N$ contribution to this parameter that, if expanded perturbatively, collapses to its constant one--loop result; remarkably all the higher--order terms in the series vanish. Non--perturbatively, however, we find that as the mass of the fermion approaches the built--in cutoff scale of the theory --- the triviality scale --- the parameter is highly dependent on the implementation of the cutoff; it is non--universal, and shows non--decoupling.
|
1705.00915
|
Cesar Bonilla
|
Cesar Bonilla, Tanmoy Modak, Rahul Srivastava, Jose W.F. Valle
|
$U(1)_{B_3-3L_\mu}$ gauge symmetry as a simple description of $b\to s$
anomalies
|
13 pages, 1 figure; Phenomenologically realistic version with some
changes in particle assignment; Version to be published in PRD
|
Phys. Rev. D 98, 095002 (2018)
|
10.1103/PhysRevD.98.095002
|
IFIC/17-XX
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a simple $U(1)_{B_3-3L_\mu}$ gauge Standard Model extension that
can easily account for the anomalies in $R(K)$ and $R(K^*)$ reported by LHCb.
The model is economical in its setup and particle content. Among the Standard
Model fermions, only the third generation quark family and the second
generation leptons transform non-trivially under the new $U(1)_{B_3-3L_\mu}$
symmetry. This leads to lepton non-universality and flavor changing neutral
currents involving the second and third quark families. We discuss the relevant
experimental constraints and some implications.
|
[
{
"created": "Tue, 2 May 2017 11:21:05 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Oct 2018 07:26:53 GMT",
"version": "v2"
}
] |
2018-11-07
|
[
[
"Bonilla",
"Cesar",
""
],
[
"Modak",
"Tanmoy",
""
],
[
"Srivastava",
"Rahul",
""
],
[
"Valle",
"Jose W. F.",
""
]
] |
We present a simple $U(1)_{B_3-3L_\mu}$ gauge Standard Model extension that can easily account for the anomalies in $R(K)$ and $R(K^*)$ reported by LHCb. The model is economical in its setup and particle content. Among the Standard Model fermions, only the third generation quark family and the second generation leptons transform non-trivially under the new $U(1)_{B_3-3L_\mu}$ symmetry. This leads to lepton non-universality and flavor changing neutral currents involving the second and third quark families. We discuss the relevant experimental constraints and some implications.
|
1505.01097
|
Francisco Escrihuela
|
F. J. Escrihuela, D. V. Forero, O. G. Miranda, M. Tortola and J. W. F.
Valle
|
Constraining right-handed neutrinos
|
6 pages, 4 figures, based on ICHEP14 conference talk
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Several models of neutrino masses predict the existence of neutral heavy
leptons. Here, we review current constraints on heavy neutrinos and apply a new
formalism separating new physics from Standard Model. We discuss also the
indirect effect of extra heavy neutrinos in oscillation experiments.
|
[
{
"created": "Tue, 5 May 2015 18:00:39 GMT",
"version": "v1"
}
] |
2015-05-06
|
[
[
"Escrihuela",
"F. J.",
""
],
[
"Forero",
"D. V.",
""
],
[
"Miranda",
"O. G.",
""
],
[
"Tortola",
"M.",
""
],
[
"Valle",
"J. W. F.",
""
]
] |
Several models of neutrino masses predict the existence of neutral heavy leptons. Here, we review current constraints on heavy neutrinos and apply a new formalism separating new physics from Standard Model. We discuss also the indirect effect of extra heavy neutrinos in oscillation experiments.
|
1906.04506
|
Boris Ermolaev
|
B.I. Ermolaev, S.I. Troyan
|
Combining the small-x evolution and DGLAP for description of inclusive
photon induced processes
|
17 pp, 2 figures, multiple drawbacks of the previous version are
corrected
|
Published in: Eur. Phys.J.C 20(2020)98
|
10.1140/epjc/s10052-020-7630-6
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Interest in studying the inclusive photon induced processes of Deep-Inelastic
Scattering (DIS) and Diffractive DIS (DDIS) at high energies includes their
experimental investigation and thorough theoretical description. The
conventional instrument for theoretical investigation of DIS at large x is
DGLAP. It describes the Q^2-evolution. Description of DIS in the small-x region
requires accounting for the both Q^2 and x -evolution at the same time.
Combining DGLAP with total resummation of double logarithms of x and Q^2, we
present a description of structure function F_1 at large Q^2 and arbitrary x.
Making use of the necessity of the shift of Q^2 in order to regulate infrared
singularities, we obtain an expression for F_1 valid at arbitrary x and Q^2.
The obtained expressions coincide with the DLA expressions at small x and at
the same time coincides with the DGLAP result at large x and large Q^2.
Accounting for virtualities k^2 of the external partons allows us to obtain
expressions for F_1 in K_T-Factorization, which are valid at arbitrary Q^2 and
arbitrary relations between Q^2 and k^2. Expressions for F_1 in all types of
QCD factorization exhibit the small-x asymptotics of the Pomeron type. This
Pomeron is generated by the high-energy asymptotics of amplitudes of the 2 -> 2
parton-parton forward scattering. These amplitudes are calculated in DLA, so
their asymptotics have nothing to do with the BFKL Pomeron. We demonstrate that
the parton-parton amplitudes can be used in the DDIS models instead of BFKL
Pomeron or combinations of hard and soft Pomerons at non-asymptotic energies.
On the other hand, this modification automatically ensures the Pomerons
asymptotics, which simplifies and makes more consistent theory of DDIS.
|
[
{
"created": "Tue, 11 Jun 2019 11:55:17 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Feb 2020 09:41:28 GMT",
"version": "v2"
},
{
"created": "Fri, 12 Nov 2021 10:00:16 GMT",
"version": "v3"
}
] |
2021-11-15
|
[
[
"Ermolaev",
"B. I.",
""
],
[
"Troyan",
"S. I.",
""
]
] |
Interest in studying the inclusive photon induced processes of Deep-Inelastic Scattering (DIS) and Diffractive DIS (DDIS) at high energies includes their experimental investigation and thorough theoretical description. The conventional instrument for theoretical investigation of DIS at large x is DGLAP. It describes the Q^2-evolution. Description of DIS in the small-x region requires accounting for the both Q^2 and x -evolution at the same time. Combining DGLAP with total resummation of double logarithms of x and Q^2, we present a description of structure function F_1 at large Q^2 and arbitrary x. Making use of the necessity of the shift of Q^2 in order to regulate infrared singularities, we obtain an expression for F_1 valid at arbitrary x and Q^2. The obtained expressions coincide with the DLA expressions at small x and at the same time coincides with the DGLAP result at large x and large Q^2. Accounting for virtualities k^2 of the external partons allows us to obtain expressions for F_1 in K_T-Factorization, which are valid at arbitrary Q^2 and arbitrary relations between Q^2 and k^2. Expressions for F_1 in all types of QCD factorization exhibit the small-x asymptotics of the Pomeron type. This Pomeron is generated by the high-energy asymptotics of amplitudes of the 2 -> 2 parton-parton forward scattering. These amplitudes are calculated in DLA, so their asymptotics have nothing to do with the BFKL Pomeron. We demonstrate that the parton-parton amplitudes can be used in the DDIS models instead of BFKL Pomeron or combinations of hard and soft Pomerons at non-asymptotic energies. On the other hand, this modification automatically ensures the Pomerons asymptotics, which simplifies and makes more consistent theory of DDIS.
|
hep-ph/0512375
|
Yoshimasa Hidaka
|
Yoshimasa Hidaka, Osamu Morimatsu and Munehisa Ohtani
|
Renormalization group equations in a model of generalized hidden local
symmetry and restoration of chiral symmetry
| null |
Phys.Rev. D73 (2006) 036004
|
10.1103/PhysRevD.73.036004
|
KEK-TH-1061
|
hep-ph
| null |
We study possible restoration patterns of chiral symmetry in a generalized
hidden local symmetry model, which is a low energy effective theory of QCD
including pseudo-scalar, vector and axial-vector mesons. We derive Wilsonian
renormalization group equations and analyze the running couplings and their
fixed points at the chiral restoration point. We find three types of the chiral
restoration, which are classified as the standard, vector manifestation and
intermediate scenarios, respectively. It turns out that the rho and A_1 meson
become massless and their decay into pion is suppressed in all the restoration
patterns. The each restoration scenario violates or fulfills the vector meson
dominance at the critical point in a different manner, which may reflect on the
contributions from the pion to the dilepton spectrum.
|
[
{
"created": "Fri, 30 Dec 2005 18:43:07 GMT",
"version": "v1"
}
] |
2009-11-11
|
[
[
"Hidaka",
"Yoshimasa",
""
],
[
"Morimatsu",
"Osamu",
""
],
[
"Ohtani",
"Munehisa",
""
]
] |
We study possible restoration patterns of chiral symmetry in a generalized hidden local symmetry model, which is a low energy effective theory of QCD including pseudo-scalar, vector and axial-vector mesons. We derive Wilsonian renormalization group equations and analyze the running couplings and their fixed points at the chiral restoration point. We find three types of the chiral restoration, which are classified as the standard, vector manifestation and intermediate scenarios, respectively. It turns out that the rho and A_1 meson become massless and their decay into pion is suppressed in all the restoration patterns. The each restoration scenario violates or fulfills the vector meson dominance at the critical point in a different manner, which may reflect on the contributions from the pion to the dilepton spectrum.
|
1211.2099
|
Malin Sjodahl
|
Malin Sj\"odahl
|
ColorMath - A package for color summed calculations in SU(Nc)
|
14 pages, published in EPJC, new package version tested also with
Mathematica 9, minor typo corrections
|
Eur. Phys. J. C. 73, (2013), 2310
|
10.1140/epjc/s10052-013-2310-4
|
LU TP 12-40, MCnet-13-04
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A Mathematica package for color summed calculations in QCD (SU(Nc)) is
presented. Color contractions of any color amplitude appearing in QCD may be
performed, and the package uses a syntax which is very similar to how color
structure is written on paper. It also supports the definition of color vectors
and bases, and special functions such as scalar products are defined for such
color tensors.
|
[
{
"created": "Fri, 9 Nov 2012 11:03:45 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Apr 2013 10:47:59 GMT",
"version": "v2"
}
] |
2013-04-12
|
[
[
"Sjödahl",
"Malin",
""
]
] |
A Mathematica package for color summed calculations in QCD (SU(Nc)) is presented. Color contractions of any color amplitude appearing in QCD may be performed, and the package uses a syntax which is very similar to how color structure is written on paper. It also supports the definition of color vectors and bases, and special functions such as scalar products are defined for such color tensors.
|
1204.2503
|
Patrick Motylinski
|
Rahul Basu, Eric Laenen, Anuradha Misra, Patrick Motylinski
|
Soft-collinear effects for prompt photon production via fragmentation
|
17 pages, 4 figures
| null | null |
NIKHEF/2012-007; ITP-UU-12/12; IMSc 2012/4/6; FR-PHENO-2012-006
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the impact of leading soft-collinear effects on threshold and
joint-resummed calculations for the production of prompt photons via parton
fragmentation, complementing a previous study for direct production. We assess
these effects for both fixed-target and collider kinematics. We find them to be
small, but noticeable and comparable to the direct case.
|
[
{
"created": "Wed, 11 Apr 2012 17:24:56 GMT",
"version": "v1"
}
] |
2012-04-12
|
[
[
"Basu",
"Rahul",
""
],
[
"Laenen",
"Eric",
""
],
[
"Misra",
"Anuradha",
""
],
[
"Motylinski",
"Patrick",
""
]
] |
We study the impact of leading soft-collinear effects on threshold and joint-resummed calculations for the production of prompt photons via parton fragmentation, complementing a previous study for direct production. We assess these effects for both fixed-target and collider kinematics. We find them to be small, but noticeable and comparable to the direct case.
|
2203.00392
|
Keyun Wu
|
Ke-Yun Wu, Zhao-Hua Xiong
|
Spin-Dependent Scattering of Scalar and Vector Dark Matter and an
Electron
|
10 pages, 4 figures
| null | null | null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The property of dark matter is unknown so far. However, a model-independent
classification of dark matter candidates can be achieved by using various
symmetries, as done in the Standard Model. Fermionic dark matter has been
researched extremely, one favored candidate is the neutralino in the Minimal
Supersymmetric Standard Model, which are required by fermion-boson symmetry and
preservation of R-parity. Bosonic dark matter has not been studied
sufficiently, especially the scenario of dark matter with mass of sub-GeV. In
this paper, we consider the effect of spin-dependent (SD) on scalar and vector
dark matter, which are mediated by pseudo-scalar and axial-vector, and evaluate
effect on the dark matter-electron scattering cross section. We list all the
interaction and form factor of dark matter-electron SD scattering, and use
XENON10/100/1T experiment data to derive the exclude limit of SD cross section.
We find that the SD scattering of scalar and vector dark matter can be three
orders of magnitude stronger than spin-independent (SI) scattering, due to the
$p$-wave scattering.
|
[
{
"created": "Tue, 1 Mar 2022 12:27:42 GMT",
"version": "v1"
},
{
"created": "Fri, 22 Apr 2022 03:19:25 GMT",
"version": "v2"
}
] |
2022-04-25
|
[
[
"Wu",
"Ke-Yun",
""
],
[
"Xiong",
"Zhao-Hua",
""
]
] |
The property of dark matter is unknown so far. However, a model-independent classification of dark matter candidates can be achieved by using various symmetries, as done in the Standard Model. Fermionic dark matter has been researched extremely, one favored candidate is the neutralino in the Minimal Supersymmetric Standard Model, which are required by fermion-boson symmetry and preservation of R-parity. Bosonic dark matter has not been studied sufficiently, especially the scenario of dark matter with mass of sub-GeV. In this paper, we consider the effect of spin-dependent (SD) on scalar and vector dark matter, which are mediated by pseudo-scalar and axial-vector, and evaluate effect on the dark matter-electron scattering cross section. We list all the interaction and form factor of dark matter-electron SD scattering, and use XENON10/100/1T experiment data to derive the exclude limit of SD cross section. We find that the SD scattering of scalar and vector dark matter can be three orders of magnitude stronger than spin-independent (SI) scattering, due to the $p$-wave scattering.
|
1104.2151
|
Hana Hlucha
|
H. Hlucha, H. Eberl, W. Frisch
|
SFOLD - a program package for calculating two-body sfermion decays at
full one-loop level in the MSSM
|
17 pages, 3 figures
| null |
10.1016/j.cpc.2012.05.022
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
SFOLD (Sfermion Full One Loop Decays) is a Fortran program package for
calculating all sfermion two-body decay widths and the corresponding branching
ratios at full one-loop level within the MSSM. The package adopts the SUSY
Parameter Analysis convention and supports the SUSY Les Houches Accord input
and output format. With the SFOLD package we found non-negligible electroweak
corrections in bosonic decays of sbottom, stop and stau.
|
[
{
"created": "Tue, 12 Apr 2011 09:37:55 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Apr 2011 17:34:06 GMT",
"version": "v2"
}
] |
2015-05-27
|
[
[
"Hlucha",
"H.",
""
],
[
"Eberl",
"H.",
""
],
[
"Frisch",
"W.",
""
]
] |
SFOLD (Sfermion Full One Loop Decays) is a Fortran program package for calculating all sfermion two-body decay widths and the corresponding branching ratios at full one-loop level within the MSSM. The package adopts the SUSY Parameter Analysis convention and supports the SUSY Les Houches Accord input and output format. With the SFOLD package we found non-negligible electroweak corrections in bosonic decays of sbottom, stop and stau.
|
hep-ph/0505070
|
Yukio Nemoto
|
Masakiyo Kitazawa, Teiji Kunihiro, Yukio Nemoto
|
Non-Fermi Liquid Behavior Induced by Resonant Diquark-pair Scattering in
Heated Quark Matter
|
6 pages, 10 eps figures, version to appear in Phys. Lett. B. typos
corrected
|
Phys.Lett. B631 (2005) 157-163
|
10.1016/j.physletb.2005.09.055
| null |
hep-ph cond-mat.supr-con nucl-th
| null |
We show how the quasiparticle picture of quarks changes near but above the
critical temperature T_c of the color-superconducting phase transition in the
heated quark matter. We demonstrate that a non-Fermi liquid behavior of the
matter develops drastically when the diquark coupling constant is increased
owing to the coupling of the quark with the pairing soft mode: We clarify that
the depression and eventually the appearance of a gap structure in the spectral
function as well as the anomalous quark dispersion relation of the quark can be
understood in terms of the resonant scattering between the incident quark and a
particle near the Fermi surface to make the pairing soft mode.
|
[
{
"created": "Tue, 10 May 2005 00:31:26 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Aug 2005 15:49:07 GMT",
"version": "v2"
},
{
"created": "Wed, 2 Nov 2005 14:25:19 GMT",
"version": "v3"
}
] |
2009-11-11
|
[
[
"Kitazawa",
"Masakiyo",
""
],
[
"Kunihiro",
"Teiji",
""
],
[
"Nemoto",
"Yukio",
""
]
] |
We show how the quasiparticle picture of quarks changes near but above the critical temperature T_c of the color-superconducting phase transition in the heated quark matter. We demonstrate that a non-Fermi liquid behavior of the matter develops drastically when the diquark coupling constant is increased owing to the coupling of the quark with the pairing soft mode: We clarify that the depression and eventually the appearance of a gap structure in the spectral function as well as the anomalous quark dispersion relation of the quark can be understood in terms of the resonant scattering between the incident quark and a particle near the Fermi surface to make the pairing soft mode.
|
hep-ph/0611198
|
Kochelev Nikolai Innokentevich
|
Nikolai Kochelev
|
Topological charge screening and the infrared behavior of the instanton
density
|
6 pages,1 figure, references added
| null | null | null |
hep-ph hep-lat hep-th
| null |
A new mechanism for suppression of the instanton density in the infrared is
considered. This mechanism is based on the phenomenon of topological charge
screening, which leads to an effective cutoff in the contribution of large
instantons.
|
[
{
"created": "Wed, 15 Nov 2006 00:01:25 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Nov 2006 23:24:59 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Kochelev",
"Nikolai",
""
]
] |
A new mechanism for suppression of the instanton density in the infrared is considered. This mechanism is based on the phenomenon of topological charge screening, which leads to an effective cutoff in the contribution of large instantons.
|
0709.1893
|
Klaus Moenig
|
Abdelhak Djouadi, Joseph Lykken, Klaus M\"onig, Yasuhiro Okada, Mark
Oreglia, Satoru Yamashita, et al
|
International Linear Collider Reference Design Report Volume 2: PHYSICS
AT THE ILC
|
The full author list is inside the paper
| null | null | null |
hep-ph
| null |
This article reviews the physics case for the ILC. Baseline running at 500
GeV as well as possible upgrades and options are discussed. The opportunities
on Standard Model physics, Higgs physics, Supersymmetry and alternative
theories beyond the Standard Model are described.
|
[
{
"created": "Wed, 12 Sep 2007 14:44:26 GMT",
"version": "v1"
}
] |
2009-09-29
|
[
[
"Djouadi",
"Abdelhak",
""
],
[
"Lykken",
"Joseph",
""
],
[
"Mönig",
"Klaus",
""
],
[
"Okada",
"Yasuhiro",
""
],
[
"Oreglia",
"Mark",
""
],
[
"Yamashita",
"Satoru",
""
]
] |
This article reviews the physics case for the ILC. Baseline running at 500 GeV as well as possible upgrades and options are discussed. The opportunities on Standard Model physics, Higgs physics, Supersymmetry and alternative theories beyond the Standard Model are described.
|
1209.1955
|
Hyun Min Lee
|
Hyun Min Lee, Myeonghun Park, Wan-Il Park
|
Axion-mediated dark matter and Higgs diphoton signal
|
29 pages, 6 figures, references added
| null |
10.1007/JHEP12(2012)037
| null |
hep-ph astro-ph.HE hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider axion-mediated dark matter models motivated by Fermi gamma ray
line at 130 GeV, where anomaly interactions of an axion-like scalar mediate a
singlet Dirac fermion dark matter (DM) to electroweak gauge bosons. In these
models, extra vector-like leptons generate anomaly interactions for the axion
and can also couple to the SM Higgs boson to modify the Higgs-to-diphoton rate.
We can distinguish models by the branching fraction of the DM annihilation into
a photon pair, favoring the model with a triplet fermion. From the condition
that the lighter charged extra lepton must be heavier than dark matter for no
tree-level DM annihilations, we also show that the ratio of Higgs-to-diphoton
rate to the SM value is constrained by vacuum stability to 1.4(1.5) for the
cutoff scale of 10(1) TeV.
|
[
{
"created": "Mon, 10 Sep 2012 12:00:52 GMT",
"version": "v1"
},
{
"created": "Mon, 17 Sep 2012 00:55:45 GMT",
"version": "v2"
}
] |
2015-06-11
|
[
[
"Lee",
"Hyun Min",
""
],
[
"Park",
"Myeonghun",
""
],
[
"Park",
"Wan-Il",
""
]
] |
We consider axion-mediated dark matter models motivated by Fermi gamma ray line at 130 GeV, where anomaly interactions of an axion-like scalar mediate a singlet Dirac fermion dark matter (DM) to electroweak gauge bosons. In these models, extra vector-like leptons generate anomaly interactions for the axion and can also couple to the SM Higgs boson to modify the Higgs-to-diphoton rate. We can distinguish models by the branching fraction of the DM annihilation into a photon pair, favoring the model with a triplet fermion. From the condition that the lighter charged extra lepton must be heavier than dark matter for no tree-level DM annihilations, we also show that the ratio of Higgs-to-diphoton rate to the SM value is constrained by vacuum stability to 1.4(1.5) for the cutoff scale of 10(1) TeV.
|
hep-ph/0304209
|
Gouranga C. Nayak
|
Michael C. Birse, Chung-Wen Kao (U. Manchester) and Gouranga C. Nayak
(LANL)
|
Screening and antiscreening in anisotropic QED and QCD plasmas
|
14 pages latex
|
Phys.Lett. B570 (2003) 171-179
|
10.1016/j.physletb.2003.08.007
| null |
hep-ph cond-mat hep-lat hep-th nucl-th
| null |
We use a transport-theory approach to construct the static propagator of a
gauge boson in a plasma with a general axially- and reflection-symmetric
momentum distribution. Non-zero magnetic screening is found if the distribution
is anisotropic, confirming the results of a closed-time-path-integral approach.
We find that the electric and magnetic screening effects depend on both the
orientation of the momentum carried by the boson and the orientation of its
polarization. In some orientations there can be antiscreening, reflecting the
instabilities of such a medium. We present some fairly general conditions on
the dependence of these effects on the anisotropy.
|
[
{
"created": "Wed, 23 Apr 2003 17:40:04 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Jul 2003 13:21:38 GMT",
"version": "v2"
},
{
"created": "Thu, 7 Aug 2003 16:26:59 GMT",
"version": "v3"
}
] |
2009-11-10
|
[
[
"Birse",
"Michael C.",
"",
"U. Manchester"
],
[
"Kao",
"Chung-Wen",
"",
"U. Manchester"
],
[
"Nayak",
"Gouranga C.",
"",
"LANL"
]
] |
We use a transport-theory approach to construct the static propagator of a gauge boson in a plasma with a general axially- and reflection-symmetric momentum distribution. Non-zero magnetic screening is found if the distribution is anisotropic, confirming the results of a closed-time-path-integral approach. We find that the electric and magnetic screening effects depend on both the orientation of the momentum carried by the boson and the orientation of its polarization. In some orientations there can be antiscreening, reflecting the instabilities of such a medium. We present some fairly general conditions on the dependence of these effects on the anisotropy.
|
1509.01715
|
Reza Khosravi
|
R. Khosravi and M. Janbazi
|
Vertices of the $D_s^{(*)}D^{(*)}K^*$
|
23 pages, 5 figures
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Taking into account the contributions of the quark-quark, quark-gluon, and
gluon-gluon condensate corrections, the strong form factors and coupling
constants of $D^*_{s0}D^*_0K^*$, $D_sDK^*$, $D^*_sD^*K^*$, $D_{s1}D_1K^*$,
$D_sD^*K^*$, and $D_{s0}D_1K^*$ vertices are investigated within the
three-point QCD sum rules method, without and with the $SU_{f}(3)$ symmetry.
|
[
{
"created": "Sat, 5 Sep 2015 16:23:56 GMT",
"version": "v1"
}
] |
2015-09-08
|
[
[
"Khosravi",
"R.",
""
],
[
"Janbazi",
"M.",
""
]
] |
Taking into account the contributions of the quark-quark, quark-gluon, and gluon-gluon condensate corrections, the strong form factors and coupling constants of $D^*_{s0}D^*_0K^*$, $D_sDK^*$, $D^*_sD^*K^*$, $D_{s1}D_1K^*$, $D_sD^*K^*$, and $D_{s0}D_1K^*$ vertices are investigated within the three-point QCD sum rules method, without and with the $SU_{f}(3)$ symmetry.
|
1210.8366
|
Georg Wolschin
|
Felix Nendzig and Georg Wolschin
|
Upsilon suppression in PbPb collisions at the LHC
|
8 pages, 8 figures; Text and Refs. updated; accepted by Phys. Rev. C
|
Phys. Rev. C 87, 024911 (2013)
|
10.1103/PhysRevC.87.024911
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We suggest that the combined effect of screening, gluon-induced dissociation,
collisional damping, and reduced feed-down explains most of the sequential
suppression of Upsilon(nS) states that has been observed in PbPb relative to pp
collisions at sqrt(s_NN) = 2.76 TeV. The suppression is thus a clear, albeit
indirect, indication for the presence of a QGP. The Upsilon(1S) ground state
suppression is essentially due to reduced feed-down, collisional damping and
gluodissociation, whereas screening prevails for the suppression of the excited
states.
|
[
{
"created": "Wed, 31 Oct 2012 15:31:50 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Feb 2013 13:30:01 GMT",
"version": "v2"
}
] |
2013-02-27
|
[
[
"Nendzig",
"Felix",
""
],
[
"Wolschin",
"Georg",
""
]
] |
We suggest that the combined effect of screening, gluon-induced dissociation, collisional damping, and reduced feed-down explains most of the sequential suppression of Upsilon(nS) states that has been observed in PbPb relative to pp collisions at sqrt(s_NN) = 2.76 TeV. The suppression is thus a clear, albeit indirect, indication for the presence of a QGP. The Upsilon(1S) ground state suppression is essentially due to reduced feed-down, collisional damping and gluodissociation, whereas screening prevails for the suppression of the excited states.
|
2301.11345
|
Yong Xu
|
Basabendu Barman, Nicol\'as Bernal, Yong Xu, and \'Oscar Zapata
|
Gravitational Wave from Graviton Bremsstrahlung during Reheating
|
v1:10+8 pages, 5 figures, comments welcome; V2: minor modifications,
version accepted for publication in JCAP; V3: typos corrected in (B.11) and
(B.25)
| null |
10.1088/1475-7516/2023/05/019
| null |
hep-ph astro-ph.CO hep-th
|
http://creativecommons.org/licenses/by/4.0/
|
We revisit graviton production via Bremsstrahlung from the decay of the
inflaton during inflationary reheating. Using two complementary computational
techniques, we first show that such 3-body differential decay rates differ from
previously reported results in the literature. We then compute the stochastic
gravitational wave (GW) background that forms during the period of reheating,
when the inflaton perturbatively decays with the radiative emission of
gravitons. By computing the number of relativistic degrees of freedom in terms
of $\Delta N_\text{eff}$, we constrain the resulting GW energy density from BBN
and CMB. Finally, we project current and future GW detector sensitivities in
probing such a stochastic GW background, which typically peaks in the GHz to
THz ballpark, opening up the opportunity to be detected with microwave cavities
and space-based GW detectors.
|
[
{
"created": "Thu, 26 Jan 2023 19:00:04 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Apr 2023 12:22:59 GMT",
"version": "v2"
},
{
"created": "Sat, 23 Sep 2023 22:18:10 GMT",
"version": "v3"
}
] |
2023-09-26
|
[
[
"Barman",
"Basabendu",
""
],
[
"Bernal",
"Nicolás",
""
],
[
"Xu",
"Yong",
""
],
[
"Zapata",
"Óscar",
""
]
] |
We revisit graviton production via Bremsstrahlung from the decay of the inflaton during inflationary reheating. Using two complementary computational techniques, we first show that such 3-body differential decay rates differ from previously reported results in the literature. We then compute the stochastic gravitational wave (GW) background that forms during the period of reheating, when the inflaton perturbatively decays with the radiative emission of gravitons. By computing the number of relativistic degrees of freedom in terms of $\Delta N_\text{eff}$, we constrain the resulting GW energy density from BBN and CMB. Finally, we project current and future GW detector sensitivities in probing such a stochastic GW background, which typically peaks in the GHz to THz ballpark, opening up the opportunity to be detected with microwave cavities and space-based GW detectors.
|
1708.07666
|
Yueling Yang
|
Junfeng Sun, Haiyan Li, Yueling Yang, Na Wang, Qin Chang, Gongru Lu
|
$B^{\ast}$ ${\to}$ $\bar{D}D$ decays with perturbative QCD approach
|
22 pages, 2 figures
|
J. Phys. G. 44, 075007 (2017)
|
10.1088/1361-6471/aa7294
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
The nonleptonic two-body $B^{\ast}$ ${\to}$ $\bar{D}D$ weak decays are
studied phenomenologically with the perturbative QCD factorization approach. It
is found that the $B_{s}^{{\ast}0}$ ${\to}$ $D_{s}^{-}D_{s}^{+}$,
$B_{d}^{{\ast}0}$ ${\to}$ $D_{d}^{-}D_{s}^{+}$, and $B_{u}^{{\ast}+}$ ${\to}$
$\bar{D}_{u}^{0}D_{s}^{+}$ decays have branching ratios ${\gtrsim}$ $10^{-9}$,
and might be promisingly measurable at the running LHC and forthcoming
SuperKEKB experiments in the future.
|
[
{
"created": "Fri, 25 Aug 2017 09:32:12 GMT",
"version": "v1"
}
] |
2017-08-28
|
[
[
"Sun",
"Junfeng",
""
],
[
"Li",
"Haiyan",
""
],
[
"Yang",
"Yueling",
""
],
[
"Wang",
"Na",
""
],
[
"Chang",
"Qin",
""
],
[
"Lu",
"Gongru",
""
]
] |
The nonleptonic two-body $B^{\ast}$ ${\to}$ $\bar{D}D$ weak decays are studied phenomenologically with the perturbative QCD factorization approach. It is found that the $B_{s}^{{\ast}0}$ ${\to}$ $D_{s}^{-}D_{s}^{+}$, $B_{d}^{{\ast}0}$ ${\to}$ $D_{d}^{-}D_{s}^{+}$, and $B_{u}^{{\ast}+}$ ${\to}$ $\bar{D}_{u}^{0}D_{s}^{+}$ decays have branching ratios ${\gtrsim}$ $10^{-9}$, and might be promisingly measurable at the running LHC and forthcoming SuperKEKB experiments in the future.
|
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