id stringlengths 9 14 | submitter stringlengths 1 56 ⌀ | authors stringlengths 5 7.68k | title stringlengths 3 299 | comments stringlengths 1 1.15k ⌀ | journal-ref stringlengths 9 298 ⌀ | doi stringlengths 12 97 ⌀ | report-no stringlengths 3 341 ⌀ | categories stringclasses 869 values | license stringclasses 9 values | orig_abstract stringlengths 16 2.44k | versions listlengths 1 39 | update_date stringlengths 10 10 | authors_parsed listlengths 1 565 | abstract stringlengths 13 2.44k |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1409.2627 | Shinji Maedan | Shinji Maedan | Analytically expressed constraint on two Majorana phases in neutrinoless
double beta decay | 36 pages, Latex; revised Figures 1 and 2, added four references [16]
[17] [18] [20] | null | null | TNCT-1401 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We assume that neutrinoless double beta decay is caused by the exchange of
three light Majorana neutrinos. Under this assumption, we obtain, by the method
of perturbation, the equation representing the isocontour of effective Majorana
mass which is the function of two CP-violating Majorana phases. The equation
representing the isocontour (constraint equation between two Majorana phases)
is expressed analytically by six parameters: two lepton mixing angles, two
kinds of neutrino mass squared differences, lightest neutrino mass scale, and
the effective Majorana mass. We discuss how the constraint equation between two
Majorana phases changes when the lightest neutrino mass scale is varied.
| [
{
"created": "Tue, 9 Sep 2014 08:02:21 GMT",
"version": "v1"
},
{
"created": "Fri, 26 Sep 2014 00:53:53 GMT",
"version": "v2"
}
] | 2014-09-29 | [
[
"Maedan",
"Shinji",
""
]
] | We assume that neutrinoless double beta decay is caused by the exchange of three light Majorana neutrinos. Under this assumption, we obtain, by the method of perturbation, the equation representing the isocontour of effective Majorana mass which is the function of two CP-violating Majorana phases. The equation representing the isocontour (constraint equation between two Majorana phases) is expressed analytically by six parameters: two lepton mixing angles, two kinds of neutrino mass squared differences, lightest neutrino mass scale, and the effective Majorana mass. We discuss how the constraint equation between two Majorana phases changes when the lightest neutrino mass scale is varied. |
1901.06352 | Bryan Larios | J. Lorenzo Diaz-Cruz and Bryan O. Larios | Very long-lived Stop NLSP in MSSM scenarios with Gravitino LSP | 21 pages, 9 figures | null | null | CIFFU-19-02 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the calculation of the stop ($\tilde{t}$) lifetime that results
from its decay into gravitinos ($\tilde{\Psi}^{\mu}$) in the final state,
namely $\tilde{t}\to \tilde{\Psi}^{\mu} + X$, where $X=t, bW, b l\nu_l$ for the
two-, three- and four-body decay modes. The full calculation is obtained using
the Feynman rules for massive gravitino, which is compared with the results
obtained employing the equivalence theorem, where the longitudinal component of
the gravitino is replaced by the goldstino. The stop turns out to be very
long-lived in these scenarios, with lifetimes of $\mathcal{O}$($10^8$s,
$10^{14}$s, $10^{20}$s) for the corresponding 2-,3- and 4-body modes under
consideration, and therefore all of them are safe from the big bang
nucleosynthesis problem. However, the lifetime for the four body decay mode
occurs during the epoch of galaxy formation. When the stop is produce at
colliders, in these scenarios, it will hadronize and decay outside of the
detector, even for the lowest values of stop lifetime.
| [
{
"created": "Fri, 18 Jan 2019 17:40:16 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Dec 2019 15:42:16 GMT",
"version": "v2"
}
] | 2019-12-12 | [
[
"Diaz-Cruz",
"J. Lorenzo",
""
],
[
"Larios",
"Bryan O.",
""
]
] | We present the calculation of the stop ($\tilde{t}$) lifetime that results from its decay into gravitinos ($\tilde{\Psi}^{\mu}$) in the final state, namely $\tilde{t}\to \tilde{\Psi}^{\mu} + X$, where $X=t, bW, b l\nu_l$ for the two-, three- and four-body decay modes. The full calculation is obtained using the Feynman rules for massive gravitino, which is compared with the results obtained employing the equivalence theorem, where the longitudinal component of the gravitino is replaced by the goldstino. The stop turns out to be very long-lived in these scenarios, with lifetimes of $\mathcal{O}$($10^8$s, $10^{14}$s, $10^{20}$s) for the corresponding 2-,3- and 4-body modes under consideration, and therefore all of them are safe from the big bang nucleosynthesis problem. However, the lifetime for the four body decay mode occurs during the epoch of galaxy formation. When the stop is produce at colliders, in these scenarios, it will hadronize and decay outside of the detector, even for the lowest values of stop lifetime. |
1606.06670 | Aleksander Filip Zarnecki | Oleksii Turkot, Katarzyna Wichmann, Aleksander Filip Zarnecki | Simplified QCD fit method for BSM analysis of HERA data | 11 pages, 6 figures | null | null | ZEUS-Note 2016-001 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The high-precision HERA data can be used as an input to a QCD analysis within
the DGLAP formalism to obtain the detailed description of the proton structure
in terms of the parton distribution functions (PDFs). However, when searching
for Beyond Standard Model (BSM) contributions in the data one should take into
account the possibility that the PDF set may already have been biased by
partially or totally absorbing previously unrecognised new physics
contributions. The ZEUS Collaboration has proposed a new approach to the BSM
analysis of the inclusive $ep$ data based on the simultaneous QCD fits of
parton distribution functions together with contributions of new physics
processes. Unfortunately, limit setting procedure in the frequentist approach
is very time consuming in this method, as full QCD analysis has to be repeated
for numerous data replicas. We describe a simplified approach, based on the
Taylor expansion of the cross section predictions in terms of PDF parameters,
which allowed us to reduce the calculation time for the BSM limits by almost
two orders of magnitude.
| [
{
"created": "Tue, 21 Jun 2016 17:19:43 GMT",
"version": "v1"
}
] | 2016-06-22 | [
[
"Turkot",
"Oleksii",
""
],
[
"Wichmann",
"Katarzyna",
""
],
[
"Zarnecki",
"Aleksander Filip",
""
]
] | The high-precision HERA data can be used as an input to a QCD analysis within the DGLAP formalism to obtain the detailed description of the proton structure in terms of the parton distribution functions (PDFs). However, when searching for Beyond Standard Model (BSM) contributions in the data one should take into account the possibility that the PDF set may already have been biased by partially or totally absorbing previously unrecognised new physics contributions. The ZEUS Collaboration has proposed a new approach to the BSM analysis of the inclusive $ep$ data based on the simultaneous QCD fits of parton distribution functions together with contributions of new physics processes. Unfortunately, limit setting procedure in the frequentist approach is very time consuming in this method, as full QCD analysis has to be repeated for numerous data replicas. We describe a simplified approach, based on the Taylor expansion of the cross section predictions in terms of PDF parameters, which allowed us to reduce the calculation time for the BSM limits by almost two orders of magnitude. |
1405.5685 | Franz Herzog | Franz Herzog, Bernhard Mistlberger | The Soft-Virtual Higgs Cross-section at N3LO and the Convergence of the
Threshold Expansion | Proceedings of Moriond QCD 2014; contains several interesting plots | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the validity of the soft-virtual approximation and the threshold
expansion for the Higgs boson production cross-section at hadron colliders in
perturbative QCD up to next-to- next-to-next-to-leading order (N3LO).
| [
{
"created": "Thu, 22 May 2014 09:38:24 GMT",
"version": "v1"
}
] | 2014-05-23 | [
[
"Herzog",
"Franz",
""
],
[
"Mistlberger",
"Bernhard",
""
]
] | We discuss the validity of the soft-virtual approximation and the threshold expansion for the Higgs boson production cross-section at hadron colliders in perturbative QCD up to next-to- next-to-next-to-leading order (N3LO). |
1410.2493 | Loredana Bellantuono | Loredana Bellantuono | Hybrid exotic mesons in soft-wall AdS/QCD | LaTex, 5 pages, 2 figures. Poster presented at "QCD@Work 2014",
International Workshop on QCD, Theory and Experiment, Giovinazzo (Bari),
Italy, June 16-19, 2014. One reference added | null | 10.1051/epjconf/20148000014 | BARI-TH/2014-692 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Hybrid mesons with exotic quantum numbers $J^{PC}=1^{-+}$ are examined in
soft-wall AdS/QCD. The predicted mass spectrum is compared to the measured
values of the candidates $\pi_1(1400)$, $\pi_1(1600)$ and $\pi_1(2015)$.
Thermal effects are analysed through the spectral function in the AdS-Black
Hole model, and the differences with the Hawking-Page description are
discussed.
| [
{
"created": "Thu, 9 Oct 2014 14:50:08 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Dec 2014 16:03:54 GMT",
"version": "v2"
}
] | 2015-06-23 | [
[
"Bellantuono",
"Loredana",
""
]
] | Hybrid mesons with exotic quantum numbers $J^{PC}=1^{-+}$ are examined in soft-wall AdS/QCD. The predicted mass spectrum is compared to the measured values of the candidates $\pi_1(1400)$, $\pi_1(1600)$ and $\pi_1(2015)$. Thermal effects are analysed through the spectral function in the AdS-Black Hole model, and the differences with the Hawking-Page description are discussed. |
0905.2205 | Anna Kaminska | Anna Kaminska (Warsaw U.), Pawel Pacholek (Warsaw U.) | Reheating in an early supersymmetric universe | Talk given at 44th Rencontres de Moriond on Electroweak Interactions
and Unified Theories, 7-14 March 2009 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Motivated by a recent discussion about the role of flat directions, a typical
feature of supersymmetric models, in the process of particle production in the
early universe a consistent model of inflation and preheating in supergravity
with MSSM fields has been built. It is based on a model proposed by M.
Kawasaki, M. Yamaguchi and T. Yanagida. In the inflationary stage, the flat
directions acquire large vacuum expectation values (VEVs) without spoiling the
background of slow-roll, high-scale inflation consistent with the latest WMAP5
observational data. In the stage of particle production, naturally following
inflation, the role of flat direction large VEVs depends strongly on effects
connected with the supergravity framework and non-renormalizable terms in the
superpotential, which have been neglected so far in the literature. Such
effects turn out to be very important, changing the previous picture of
preheating in the presence of large flat direction VEVs by allowing for
efficient preheating from the inflaton.
| [
{
"created": "Wed, 13 May 2009 21:53:01 GMT",
"version": "v1"
}
] | 2009-05-15 | [
[
"Kaminska",
"Anna",
"",
"Warsaw U."
],
[
"Pacholek",
"Pawel",
"",
"Warsaw U."
]
] | Motivated by a recent discussion about the role of flat directions, a typical feature of supersymmetric models, in the process of particle production in the early universe a consistent model of inflation and preheating in supergravity with MSSM fields has been built. It is based on a model proposed by M. Kawasaki, M. Yamaguchi and T. Yanagida. In the inflationary stage, the flat directions acquire large vacuum expectation values (VEVs) without spoiling the background of slow-roll, high-scale inflation consistent with the latest WMAP5 observational data. In the stage of particle production, naturally following inflation, the role of flat direction large VEVs depends strongly on effects connected with the supergravity framework and non-renormalizable terms in the superpotential, which have been neglected so far in the literature. Such effects turn out to be very important, changing the previous picture of preheating in the presence of large flat direction VEVs by allowing for efficient preheating from the inflaton. |
2004.02921 | Simone Biondini | Simone Biondini and K. Sravan Kumar | Dark matter and Standard Model reheating from conformal GUT inflation | 38 pages, 9 figures, matches published version | J. High Energ. Phys. 2020, 39 (2020) | 10.1007/JHEP07(2020)039 | null | hep-ph astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Spontaneous breaking of conformal symmetry has been widely exploited in
successful model building of both inflationary cosmology and particle physics
phenomenology. Conformal Grand Unified Theory (CGUT) inflation provides the
same scalar tilt and tensor-to-scalar ratio as of Starobinsky and Higgs
inflation. Moreover, it predicts a proton life time compatible with the current
experimental bound. In this paper, we extend CGUT to account for the production
of dark matter and the reheating of the Standard Model. To this end, we
introduce a hidden sector directly coupled to the inflaton, whereas the
reheating of the visible sector is realized through a portal coupling between
the dark particles and the Higgs boson. The masses and interactions of the dark
particles and the Higgs boson are determined by the form of the conformal
potential and the non-vanishing VEV of the inflaton. We provide benchmark
points in the parameter space of the model that give the observed dark matter
relic density and reheating temperatures compatible with the Big Bang
nucleosynthesis.
| [
{
"created": "Mon, 6 Apr 2020 18:18:36 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Apr 2020 18:57:07 GMT",
"version": "v2"
},
{
"created": "Thu, 9 Jul 2020 11:28:01 GMT",
"version": "v3"
}
] | 2020-07-28 | [
[
"Biondini",
"Simone",
""
],
[
"Kumar",
"K. Sravan",
""
]
] | Spontaneous breaking of conformal symmetry has been widely exploited in successful model building of both inflationary cosmology and particle physics phenomenology. Conformal Grand Unified Theory (CGUT) inflation provides the same scalar tilt and tensor-to-scalar ratio as of Starobinsky and Higgs inflation. Moreover, it predicts a proton life time compatible with the current experimental bound. In this paper, we extend CGUT to account for the production of dark matter and the reheating of the Standard Model. To this end, we introduce a hidden sector directly coupled to the inflaton, whereas the reheating of the visible sector is realized through a portal coupling between the dark particles and the Higgs boson. The masses and interactions of the dark particles and the Higgs boson are determined by the form of the conformal potential and the non-vanishing VEV of the inflaton. We provide benchmark points in the parameter space of the model that give the observed dark matter relic density and reheating temperatures compatible with the Big Bang nucleosynthesis. |
hep-ph/0010060 | Victor Goncalves | V. P. Goncalves (IFM - UFPel) | Searching Saturation in eA Processes | 13 pages, 2 figures, 1 table | Phys.Lett. B495 (2000) 303-308 | 10.1016/S0370-2693(00)01258-2 | null | hep-ph | null | The high density effects should be manifest at small x and/or large nuclei.
In this letter we consider the behavior of nuclear structure function $F_2^A$
slope in the kinematic region which could be explored in the future eA
colliders as a search of these effects. We verify that the high density implies
that the maximum value of the slope occurs at large values of the photon
virtuality, i.e. in a perturbative regime, and is dependent of the number of
nucleons A and energy. Our conclusion is that the measurement of this
observable will allow to explicit the saturation.
| [
{
"created": "Fri, 6 Oct 2000 18:07:23 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Goncalves",
"V. P.",
"",
"IFM - UFPel"
]
] | The high density effects should be manifest at small x and/or large nuclei. In this letter we consider the behavior of nuclear structure function $F_2^A$ slope in the kinematic region which could be explored in the future eA colliders as a search of these effects. We verify that the high density implies that the maximum value of the slope occurs at large values of the photon virtuality, i.e. in a perturbative regime, and is dependent of the number of nucleons A and energy. Our conclusion is that the measurement of this observable will allow to explicit the saturation. |
hep-ph/0311029 | Ricardo Gonzalez Felipe | R. Gonzalez Felipe, F. R. Joaquim, B. M. Nobre | Radiatively induced leptogenesis in a minimal seesaw model | 6 pages, 2 figures, uses RevTeX4, calculations improved, comments
added | Phys.Rev.D70:085009,2004 | 10.1103/PhysRevD.70.085009 | null | hep-ph | null | We study the possibility that the baryon asymmetry of the universe is
generated in a minimal seesaw scenario where two right-handed Majorana
neutrinos with degenerate masses are added to the standard model particle
content. In the usual framework of thermal leptogenesis, a nonzero $CP$
asymmetry can be obtained through the mass splitting induced by the running of
the heavy Majorana neutrino masses from their degeneracy scale down to the
seesaw scale. Although, in the light of the present neutrino oscillation data,
the produced baryon asymmetry turns out to be smaller than the experimental
value, the present mechanism could be viable in simple extensions of the
standard model.
| [
{
"created": "Tue, 4 Nov 2003 19:23:20 GMT",
"version": "v1"
},
{
"created": "Fri, 16 Apr 2004 18:53:55 GMT",
"version": "v2"
},
{
"created": "Wed, 15 Sep 2004 18:00:49 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Felipe",
"R. Gonzalez",
""
],
[
"Joaquim",
"F. R.",
""
],
[
"Nobre",
"B. M.",
""
]
] | We study the possibility that the baryon asymmetry of the universe is generated in a minimal seesaw scenario where two right-handed Majorana neutrinos with degenerate masses are added to the standard model particle content. In the usual framework of thermal leptogenesis, a nonzero $CP$ asymmetry can be obtained through the mass splitting induced by the running of the heavy Majorana neutrino masses from their degeneracy scale down to the seesaw scale. Although, in the light of the present neutrino oscillation data, the produced baryon asymmetry turns out to be smaller than the experimental value, the present mechanism could be viable in simple extensions of the standard model. |
1102.3251 | Ru Peng | R Peng and C B Yang | Productions of Heavy Flavored Mesons in Relativistic Heavy Ion
Collisions in the Recombination Model | 15pages, 14 figures | Int.J.Mod.Phys.E20:1213-1226,2011 | 10.1142/S0218301311018356 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We get the distributions of shower partons initiated by heavy quarks $c$ and
$b$ by studying the fragmentation functions in the framework of the
recombination model. The transverse momentum spectra of heavy flavored mesons
are predicted with these distributions. We find that the contribution from the
recombination of thermal-shower partons is an important part in the total
spectrum for the mesons. We predict the heavy flavored meson productions for
different centralities with the heavy quark fugacities fitted by the
experimental data of $J/\psi$ transverse momentum spectra in Au+Au collisions.
| [
{
"created": "Wed, 16 Feb 2011 06:43:44 GMT",
"version": "v1"
}
] | 2011-06-13 | [
[
"Peng",
"R",
""
],
[
"Yang",
"C B",
""
]
] | We get the distributions of shower partons initiated by heavy quarks $c$ and $b$ by studying the fragmentation functions in the framework of the recombination model. The transverse momentum spectra of heavy flavored mesons are predicted with these distributions. We find that the contribution from the recombination of thermal-shower partons is an important part in the total spectrum for the mesons. We predict the heavy flavored meson productions for different centralities with the heavy quark fugacities fitted by the experimental data of $J/\psi$ transverse momentum spectra in Au+Au collisions. |
hep-ph/9712375 | Ljuba Rasdolskaya | E.Gedalin, A.Moalem and L.Razdolskaja | A Covariant OBE Model for $\eta$ Production in NN Collisions | 40 pages, 15 figures | Nucl.Phys. A634 (1998) 368-392 | 10.1016/S0375-9474(98)00152-3 | BGU PH-97/14 | hep-ph | null | A relativistic covariant one boson exchange model, previously applied to
describe elastic nucleon-nucleon scattering, is extended to study $\eta$
production in NN collisions. The transition amplitude for the elementary
BN->$\eta$N process with B being the meson exchanged (B=$\pi$, $|sigma$,$\eta$,
$\rho$, $\omega$ and $\delta$) are taken to be the sum of four terms
corresponding to s and u-channels with a nucleon or a nucleon isobar
N*(1535MeV) in the intermediate states. Taking the relative phases of the
various exchange amplitudes to be +1, the model reproduces the cross sections
for the $NN\to X\eta$ reactions in a consistent manner. In the limit where all
$\eta$'s are produced via N^* excitations, interference terms between the
overall contributions from the exchange of pseudoscalart and scalar mesons with
that of vector mesons cancel out. Consequently, much of the ambiguities in the
model predictions due to unknown relative phases of different vector
pseudoscalar exchanges are strongly reduced.
| [
{
"created": "Mon, 15 Dec 1997 08:21:09 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Dec 1997 07:38:09 GMT",
"version": "v2"
}
] | 2009-10-30 | [
[
"Gedalin",
"E.",
""
],
[
"Moalem",
"A.",
""
],
[
"Razdolskaja",
"L.",
""
]
] | A relativistic covariant one boson exchange model, previously applied to describe elastic nucleon-nucleon scattering, is extended to study $\eta$ production in NN collisions. The transition amplitude for the elementary BN->$\eta$N process with B being the meson exchanged (B=$\pi$, $|sigma$,$\eta$, $\rho$, $\omega$ and $\delta$) are taken to be the sum of four terms corresponding to s and u-channels with a nucleon or a nucleon isobar N*(1535MeV) in the intermediate states. Taking the relative phases of the various exchange amplitudes to be +1, the model reproduces the cross sections for the $NN\to X\eta$ reactions in a consistent manner. In the limit where all $\eta$'s are produced via N^* excitations, interference terms between the overall contributions from the exchange of pseudoscalart and scalar mesons with that of vector mesons cancel out. Consequently, much of the ambiguities in the model predictions due to unknown relative phases of different vector pseudoscalar exchanges are strongly reduced. |
1504.05979 | Nikolai Zerf | M. Baker, A.A. Penin, D. Seidel, N. Zerf | Bottomonium Hyperfine Splitting on the Lattice and in the Continuum | 6 pages, 2 figures, journal version | Phys. Rev. D 92, 054502 (2015) | 10.1103/PhysRevD.92.054502 | ALBERTA-THY-03-15, QFET-2015-16, SI-HEP-2015-13 | hep-ph hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We revise the analysis of the bottomonium hyperfine splitting within the
lattice nonrelativistic QCD. The Wilson coefficients of the radiatively
improved lattice action are evaluated by a semianalytic approach based on the
asymptotic expansion about the continuum limit. The nonrelativistic
renormalization group is used to estimate the high-order radiative corrections.
Our result for the $1S$ hyperfine splitting is
$M_{\Upsilon(1S)}-M_{\eta_b(1S)}=52.9\pm 5.5~{\rm MeV}$. It reconciles the
predictions of the continuum and lattice QCD and is in very good agreement with
the most accurate experimental measurement by Belle collaboration.
| [
{
"created": "Wed, 22 Apr 2015 20:41:33 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Sep 2015 22:20:11 GMT",
"version": "v2"
}
] | 2015-09-23 | [
[
"Baker",
"M.",
""
],
[
"Penin",
"A. A.",
""
],
[
"Seidel",
"D.",
""
],
[
"Zerf",
"N.",
""
]
] | We revise the analysis of the bottomonium hyperfine splitting within the lattice nonrelativistic QCD. The Wilson coefficients of the radiatively improved lattice action are evaluated by a semianalytic approach based on the asymptotic expansion about the continuum limit. The nonrelativistic renormalization group is used to estimate the high-order radiative corrections. Our result for the $1S$ hyperfine splitting is $M_{\Upsilon(1S)}-M_{\eta_b(1S)}=52.9\pm 5.5~{\rm MeV}$. It reconciles the predictions of the continuum and lattice QCD and is in very good agreement with the most accurate experimental measurement by Belle collaboration. |
2405.13104 | Benjamin Safdi | Nicholas L. Rodd, Benjamin R. Safdi, Weishuang Linda Xu | CTA and SWGO can Discover Higgsino Dark Matter Annihilation | 42 pages, 38 figures, video abstract at https://youtu.be/8VxOuEDm16A | null | null | null | hep-ph astro-ph.CO astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Thermal higgsino dark matter (DM), with a mass near 1.1 TeV, is one of the
most well-motivated and untested DM candidates. Leveraging recent hydrodynamic
cosmological simulations that give DM density profiles in Milky Way analogue
galaxies we show that the line-like gamma-ray signal predicted from higgsino
annihilation in the Galactic Center could be detected at high significance with
the upcoming Cherenkov Telescope Array (CTA) and Southern Wide-field Gamma-ray
Observatory (SWGO) for all but the most pessimistic DM profiles. We perform the
most sensitive search to-date for the line-like signal using 15 years of data
from the Fermi Large Area Telescope, coming within an order one factor of the
necessary sensitivity to detect the higgsino for some Milky Way analogue DM
density profiles. We show that H.E.S.S. has sub-leading sensitivity relative to
Fermi for the higgsino at present. In contrast, we analyze H.E.S.S. inner
Galaxy data for the thermal wino model with a mass near 2.8 TeV; we find no
evidence for a DM signal and exclude the wino by over a factor of two in
cross-section for all DM profiles considered. In the process, we identify and
attempt to correct what appears to be an inconsistency in previous H.E.S.S.
inner Galaxy analyses for DM annihilation related to the analysis effective
area, which may weaken the DM cross-section sensitivity claimed in those works
by around an order of magnitude.
| [
{
"created": "Tue, 21 May 2024 18:00:00 GMT",
"version": "v1"
}
] | 2024-05-24 | [
[
"Rodd",
"Nicholas L.",
""
],
[
"Safdi",
"Benjamin R.",
""
],
[
"Xu",
"Weishuang Linda",
""
]
] | Thermal higgsino dark matter (DM), with a mass near 1.1 TeV, is one of the most well-motivated and untested DM candidates. Leveraging recent hydrodynamic cosmological simulations that give DM density profiles in Milky Way analogue galaxies we show that the line-like gamma-ray signal predicted from higgsino annihilation in the Galactic Center could be detected at high significance with the upcoming Cherenkov Telescope Array (CTA) and Southern Wide-field Gamma-ray Observatory (SWGO) for all but the most pessimistic DM profiles. We perform the most sensitive search to-date for the line-like signal using 15 years of data from the Fermi Large Area Telescope, coming within an order one factor of the necessary sensitivity to detect the higgsino for some Milky Way analogue DM density profiles. We show that H.E.S.S. has sub-leading sensitivity relative to Fermi for the higgsino at present. In contrast, we analyze H.E.S.S. inner Galaxy data for the thermal wino model with a mass near 2.8 TeV; we find no evidence for a DM signal and exclude the wino by over a factor of two in cross-section for all DM profiles considered. In the process, we identify and attempt to correct what appears to be an inconsistency in previous H.E.S.S. inner Galaxy analyses for DM annihilation related to the analysis effective area, which may weaken the DM cross-section sensitivity claimed in those works by around an order of magnitude. |
1507.03419 | Gui-Jun Ding | Peng Chen, Chang-Yuan Yao, Gui-Jun Ding | Neutrino Mixing from CP Symmetry | 18 pages, 2 figures | Phys. Rev. D 92, 073002 (2015) | 10.1103/PhysRevD.92.073002 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The neutrino mass matrix has remnant CP symmetry expressed in terms of the
lepton mixing matrix, and vice versa the remnant CP transformations allow us to
reconstruct the mixing matrix. We study the scenario that all the four remnant
CP transformations are preserved by the neutrino mass matrix. The most general
parameterization of remnant CP transformations is presented. The lepton mixing
matrix is completely fixed by the remnant CP, and its explicit form is derived.
The necessary and sufficient condition for conserved Dirac CP violating phase
is found. If the Klein four flavor symmetry generated by the postulated remnant
CP transformations arises from a finite flavor symmetry group, the
phenomenologically viable lepton flavor mixing would be the trimaximal pattern,
both Dirac CP phase $\delta_{CP}$ and Majorana phase $\alpha_{31}$ are either
$0$ or $\pi$ while another Majorana phase $\alpha_{21}$ is a rational multiple
of $\pi$. These general results are confirmed to be true in the case that the
finite flavor symmetry group is $\Delta(6n^2)$.
| [
{
"created": "Mon, 13 Jul 2015 12:24:28 GMT",
"version": "v1"
}
] | 2015-10-07 | [
[
"Chen",
"Peng",
""
],
[
"Yao",
"Chang-Yuan",
""
],
[
"Ding",
"Gui-Jun",
""
]
] | The neutrino mass matrix has remnant CP symmetry expressed in terms of the lepton mixing matrix, and vice versa the remnant CP transformations allow us to reconstruct the mixing matrix. We study the scenario that all the four remnant CP transformations are preserved by the neutrino mass matrix. The most general parameterization of remnant CP transformations is presented. The lepton mixing matrix is completely fixed by the remnant CP, and its explicit form is derived. The necessary and sufficient condition for conserved Dirac CP violating phase is found. If the Klein four flavor symmetry generated by the postulated remnant CP transformations arises from a finite flavor symmetry group, the phenomenologically viable lepton flavor mixing would be the trimaximal pattern, both Dirac CP phase $\delta_{CP}$ and Majorana phase $\alpha_{31}$ are either $0$ or $\pi$ while another Majorana phase $\alpha_{21}$ is a rational multiple of $\pi$. These general results are confirmed to be true in the case that the finite flavor symmetry group is $\Delta(6n^2)$. |
1111.0182 | Jacqueline A. Bonnet | J. A. Bonnet, C. S. Fischer and R. Williams | Effects of Anisotropy in (2+1)-dimensional QED | 7 pages, 4 figures, contribution to the proceedings of the
International School of Nuclear Physics, Erice 2011 | null | 10.1016/j.ppnp.2011.12.026 | null | hep-ph cond-mat.supr-con | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We summarize our results for the impact of anisotropic fermionic velocities
in (2+1)-dimensional QED on the critical number of fermion flavors, N^c_f, and
dynamical mass generation. We apply different approximation schemes for the
gauge boson vacuum polarization and the fermion-boson vertex to analyze the
according Dyson-Schwinger equations in a finite volume. Our results point
towards large variations of N^c_f away from the isotropic point in agreement
with other approaches.
| [
{
"created": "Tue, 1 Nov 2011 12:08:25 GMT",
"version": "v1"
}
] | 2015-06-03 | [
[
"Bonnet",
"J. A.",
""
],
[
"Fischer",
"C. S.",
""
],
[
"Williams",
"R.",
""
]
] | We summarize our results for the impact of anisotropic fermionic velocities in (2+1)-dimensional QED on the critical number of fermion flavors, N^c_f, and dynamical mass generation. We apply different approximation schemes for the gauge boson vacuum polarization and the fermion-boson vertex to analyze the according Dyson-Schwinger equations in a finite volume. Our results point towards large variations of N^c_f away from the isotropic point in agreement with other approaches. |
1812.01633 | Adarsh Pyarelal | Felix Kling, Honglei Li, Adarsh Pyarelal, Huayang Song, Shufang Su | Exotic Higgs Decays in Type-II 2HDMs at the LHC and Future 100 TeV
Hadron Colliders | null | null | 10.1007/JHEP06(2019)031 | UCI-TR-2018-09 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The exotic decay modes of non-Standard Model (SM) Higgses in models with
extended Higgs sectors have the potential to serve as powerful search channels
to explore the space of Two-Higgs Doublet Models (2HDMs) that cannot be studied
effectively using conventional decay channels. Once kinematically allowed,
heavy Higgses could decay into pairs of light non-SM Higgses, or a non-SM Higgs
and a SM gauge boson, with branching fractions that dominate those of the
conventional decay modes to SM particles. In this study, we focus on the
prospects of probing exotic decay channels at the LHC and a future 100 TeV
\emph{pp} collider in the context of Type-II 2HDMs. We study the three
prominent exotic decay channels, A -> HZ, A -> H^+ W and H^+ -> HW, and find
that a 100-TeV pp collider can probe the entire region of the Type-II 2HDM
parameter space that survives current theoretical and experimental constraints
with exotic decay branching fraction > 20%.
| [
{
"created": "Tue, 4 Dec 2018 19:14:41 GMT",
"version": "v1"
}
] | 2019-06-26 | [
[
"Kling",
"Felix",
""
],
[
"Li",
"Honglei",
""
],
[
"Pyarelal",
"Adarsh",
""
],
[
"Song",
"Huayang",
""
],
[
"Su",
"Shufang",
""
]
] | The exotic decay modes of non-Standard Model (SM) Higgses in models with extended Higgs sectors have the potential to serve as powerful search channels to explore the space of Two-Higgs Doublet Models (2HDMs) that cannot be studied effectively using conventional decay channels. Once kinematically allowed, heavy Higgses could decay into pairs of light non-SM Higgses, or a non-SM Higgs and a SM gauge boson, with branching fractions that dominate those of the conventional decay modes to SM particles. In this study, we focus on the prospects of probing exotic decay channels at the LHC and a future 100 TeV \emph{pp} collider in the context of Type-II 2HDMs. We study the three prominent exotic decay channels, A -> HZ, A -> H^+ W and H^+ -> HW, and find that a 100-TeV pp collider can probe the entire region of the Type-II 2HDM parameter space that survives current theoretical and experimental constraints with exotic decay branching fraction > 20%. |
1807.08401 | Ivan Vitev | Ivan Vitev | Quarkonium tomography of heavy ion collisions at the LHC | 4 pages, 4 figures; proceedings of the XXVIIth International
Conference on Ultrarelativistic Nucleus-Nucleus Collisions (Quark Matter
2018) | null | 10.1016/j.nuclphysa.2018.10.019 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Quarkonium production in high-energy hadronic collisions provides a
fundamental test of QCD. Its modification in a nuclear medium is a sensitive
probe of the space-time temperature profile and transport properties of the
QGP, yielding constraints complementary to the ones obtained from the quenching
of light hadrons and jets, and open heavy flavor. In these proceedings, we
report new results for the suppression of high transverse momentum charmonium
[$J/\psi,\, \psi(2S)$] and bottomonium [$\Upsilon(1S),\, \Upsilon(2S),\,
\Upsilon(3S)$] states in Pb+Pb collisions at the Large Hadron Collider. Our
theoretical formalism combines the collisional dissociation of quarkonia, as
they propagate in the quark-gluon plasma, with the thermal wavefunction effects
due to the screening of the $Q\bar{Q}$ attractive potential in the medium. We
find that a good description of the relative suppression of the ground and
higher excited quarkonium states, transverse momentum and centrality
distributions is achieved, when comparison to measurements at a center-of-mass
energy of 2.76 TeV is performed. Theoretical predictions for the highest Pb+Pb
center-of-mass energy of 5.02 TeV at the LHC, where new experimental results
are being finalized are presented. Preliminary calculations for smaller
systems, such as Xe+Xe are also shown. Last but not least, the potential of jet
substructure to shed light in the mechanisms of heavy flavor production is
discussed.
| [
{
"created": "Mon, 23 Jul 2018 02:05:33 GMT",
"version": "v1"
}
] | 2019-02-20 | [
[
"Vitev",
"Ivan",
""
]
] | Quarkonium production in high-energy hadronic collisions provides a fundamental test of QCD. Its modification in a nuclear medium is a sensitive probe of the space-time temperature profile and transport properties of the QGP, yielding constraints complementary to the ones obtained from the quenching of light hadrons and jets, and open heavy flavor. In these proceedings, we report new results for the suppression of high transverse momentum charmonium [$J/\psi,\, \psi(2S)$] and bottomonium [$\Upsilon(1S),\, \Upsilon(2S),\, \Upsilon(3S)$] states in Pb+Pb collisions at the Large Hadron Collider. Our theoretical formalism combines the collisional dissociation of quarkonia, as they propagate in the quark-gluon plasma, with the thermal wavefunction effects due to the screening of the $Q\bar{Q}$ attractive potential in the medium. We find that a good description of the relative suppression of the ground and higher excited quarkonium states, transverse momentum and centrality distributions is achieved, when comparison to measurements at a center-of-mass energy of 2.76 TeV is performed. Theoretical predictions for the highest Pb+Pb center-of-mass energy of 5.02 TeV at the LHC, where new experimental results are being finalized are presented. Preliminary calculations for smaller systems, such as Xe+Xe are also shown. Last but not least, the potential of jet substructure to shed light in the mechanisms of heavy flavor production is discussed. |
1702.03697 | Oleksandr Novak | O. Novak | Pair production by an electron to excited levels in a magnetic field | 4 pages, 1 figure | 2015 Phys. Scr.90, 085305 | 10.1088/0031-8949/90/8/085305 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The resonant process of electron-positron pairproduction by an electron in a
subcritical magnetic field has been studied when the pair is produced to exited
Landau levels. The spin dependency of the process rate has been analyzed. In
the spin state with the greatest rate the virtual photon is emitted with a flip
of electron spin. This behavior is not suppressed for radiative transitions
from a relativistic initial state to low energy levels.
| [
{
"created": "Mon, 13 Feb 2017 10:12:03 GMT",
"version": "v1"
}
] | 2017-02-14 | [
[
"Novak",
"O.",
""
]
] | The resonant process of electron-positron pairproduction by an electron in a subcritical magnetic field has been studied when the pair is produced to exited Landau levels. The spin dependency of the process rate has been analyzed. In the spin state with the greatest rate the virtual photon is emitted with a flip of electron spin. This behavior is not suppressed for radiative transitions from a relativistic initial state to low energy levels. |
hep-ph/9603217 | Daniel Boyanovsky | D. Boyanovsky, I.D. Lawrie and D.S. Lee | Relaxation and Kinetics in Scalar Field Theories | 28 pages, revtex 3.0, two figures available upon request | Phys.Rev. D54 (1996) 4013-4028 | 10.1103/PhysRevD.54.4013 | PITT-96-172 | hep-ph nucl-th | null | A new approach to the dynamics of relaxation and kinetics of thermalization
in a scalar field theory is presented that incorporates the relevant time
scales through the resummation of hard thermal loops. An alternative derivation
of the kinetic equations for the ``quasiparticle'' distribution functions is
obtained that allows a clear understanding of the different ``coarse graining''
approximations usually involved in a kinetic description. This method leads to
a systematic perturbative expansion to obtain the kinetic equations including
hard-thermal loop resummation and to an improvement including renormalization,
off-shell effects and contributions that change chemical equilibrium on short
time scales. As a byproduct of these methods we establish the relation between
the relaxation time scale in the linearized equation of motion of the
quasiparticles and the thermalization time scale of the quasiparticle
distribution function in the ``relaxation time approximation''. Hard thermal
loop resummation dramatically modifies the scattering rate for long wavelength
modes as compared to the usual (semi) classical estimate. Relaxation and
kinetics are studied both in the unbroken and broken symmetry phases of the
theory. The broken symmetry phase also provides the setting to obtain the
contribution to the kinetic equations from processes that involve decay of a
heavy scalar into light scalar particles in the medium.
| [
{
"created": "Mon, 4 Mar 1996 14:58:09 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Boyanovsky",
"D.",
""
],
[
"Lawrie",
"I. D.",
""
],
[
"Lee",
"D. S.",
""
]
] | A new approach to the dynamics of relaxation and kinetics of thermalization in a scalar field theory is presented that incorporates the relevant time scales through the resummation of hard thermal loops. An alternative derivation of the kinetic equations for the ``quasiparticle'' distribution functions is obtained that allows a clear understanding of the different ``coarse graining'' approximations usually involved in a kinetic description. This method leads to a systematic perturbative expansion to obtain the kinetic equations including hard-thermal loop resummation and to an improvement including renormalization, off-shell effects and contributions that change chemical equilibrium on short time scales. As a byproduct of these methods we establish the relation between the relaxation time scale in the linearized equation of motion of the quasiparticles and the thermalization time scale of the quasiparticle distribution function in the ``relaxation time approximation''. Hard thermal loop resummation dramatically modifies the scattering rate for long wavelength modes as compared to the usual (semi) classical estimate. Relaxation and kinetics are studied both in the unbroken and broken symmetry phases of the theory. The broken symmetry phase also provides the setting to obtain the contribution to the kinetic equations from processes that involve decay of a heavy scalar into light scalar particles in the medium. |
hep-ph/9611207 | null | Pervez Hoodbhoy | Wavefunction corrections and off-forward gluon distributions in
diffractive J/psi electroproduction | 14 pages, 3 figures (Latex) | Phys.Rev. D56 (1997) 388-393 | 10.1103/PhysRevD.56.388 | null | hep-ph | null | Diffractive production of J/Psi particles by virtual photons on a proton
target is studied with a view towards understanding two important corrections
to the leading order result. First, the effect of Fermi motion of the heavy
quarks is studied by performing a systematic expansion in the relative
velocity, and a simple correction factor is derived. This is considerably less
than estimated previously. Second, since the kinematics necessarily requires
that non-zero momentum be transferred to the proton, off-forward gluon
distributions are probed by the scattering process. To estimate the importance
of the off-forwardness, we compute, in leading order perturbation theory, the
extent of deviation from the usual forward gluon distribution in a quark.
| [
{
"created": "Fri, 1 Nov 1996 19:27:07 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Hoodbhoy",
"Pervez",
""
]
] | Diffractive production of J/Psi particles by virtual photons on a proton target is studied with a view towards understanding two important corrections to the leading order result. First, the effect of Fermi motion of the heavy quarks is studied by performing a systematic expansion in the relative velocity, and a simple correction factor is derived. This is considerably less than estimated previously. Second, since the kinematics necessarily requires that non-zero momentum be transferred to the proton, off-forward gluon distributions are probed by the scattering process. To estimate the importance of the off-forwardness, we compute, in leading order perturbation theory, the extent of deviation from the usual forward gluon distribution in a quark. |
hep-ph/0511009 | Anders Tranberg | Anders Tranberg | The 2PI coupling expansion revisited | 5 pages, 4 figures. To appear in the proceedings of XQCD, Swansea,
2-5 August 2005 | null | null | null | hep-ph | null | Recently, out-of-equilibrium field theory has been studied using
approximations based on truncations of the 2PI effective action. Although
results are promising, the convergence of subsequent orders of the
approximation is difficult to get a handle on, mainly because, generically,
only the lowest non-trivial order is currently numerically tractable. We study
one specific case, the broken phase of the phi^4 model, where the existence of
an effective three point vertex makes it possible to compare a lowest and
next-to-lowest non-trivial order.
| [
{
"created": "Tue, 1 Nov 2005 16:10:57 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Tranberg",
"Anders",
""
]
] | Recently, out-of-equilibrium field theory has been studied using approximations based on truncations of the 2PI effective action. Although results are promising, the convergence of subsequent orders of the approximation is difficult to get a handle on, mainly because, generically, only the lowest non-trivial order is currently numerically tractable. We study one specific case, the broken phase of the phi^4 model, where the existence of an effective three point vertex makes it possible to compare a lowest and next-to-lowest non-trivial order. |
hep-ph/9503448 | null | M. H. Friedman, Y. Srivastava and A. Widom | FERMIONS IN AN EXTERNAL SU(2) MAGNETIC FIELD | 7 pages, Latex | J.Phys.G23:1061-1064,1997 | 10.1088/0954-3899/23/9/005 | NUB 3114, March 1995 | hep-ph | null | We consider Fermions in a constant and uniform external $SU(2)$ magnetic
field. We find that the results for the energy levels depend on the choice of
gauge potential. Choosing a Landau type gauge potential yields his results. On
the other hand in another gauge potential, one obtains a different continuous
eigenvalue spectrum.
| [
{
"created": "Mon, 27 Mar 1995 20:07:28 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Friedman",
"M. H.",
""
],
[
"Srivastava",
"Y.",
""
],
[
"Widom",
"A.",
""
]
] | We consider Fermions in a constant and uniform external $SU(2)$ magnetic field. We find that the results for the energy levels depend on the choice of gauge potential. Choosing a Landau type gauge potential yields his results. On the other hand in another gauge potential, one obtains a different continuous eigenvalue spectrum. |
hep-ph/0209108 | Fabian Franke | T. Mayer, C. Bloechinger, F. Franke, H. Fraas | Chargino Production and Decay in Photon-Photon-Collisions | 22 pages, 15 figures, version to be published in Eur. Phys. J. C | Eur.Phys.J.C27:135-143,2003 | 10.1140/epjc/s2002-01095-0 | WUE-ITP-2002-022 | hep-ph | null | We discuss the pair production of charginos in collisions of polarized
photons $\gamma\gamma \to \tilde{\chi}_i^+ \tilde{\chi}_i^-$, ($i=1,2$) and the
subsequent leptonic decay of the lighter chargino $\tilde{\chi}_1^+ \to
\tilde{\chi}_1^0 e^+ \nu_e$ including the complete spin correlations.
Analytical formulae are given for the polarization and the spin-spin
correlations of the charginos. Since the production is a pure QED process the
decay dynamics can be studied separately. For high energy photons from Compton
backscattering of polarized laser pulses off polarized electron beams numerical
results are presented for the cross section, the angular distribution and the
forward-backward asymmetry of the decay positron. Finally we study the
dependence on the gaugino mass parameter $M_1$ and on the sneutrino mass for a
gaugino-like MSSM scenario.
| [
{
"created": "Tue, 10 Sep 2002 19:57:25 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Sep 2002 20:11:42 GMT",
"version": "v2"
},
{
"created": "Mon, 4 Nov 2002 21:34:17 GMT",
"version": "v3"
}
] | 2009-01-07 | [
[
"Mayer",
"T.",
""
],
[
"Bloechinger",
"C.",
""
],
[
"Franke",
"F.",
""
],
[
"Fraas",
"H.",
""
]
] | We discuss the pair production of charginos in collisions of polarized photons $\gamma\gamma \to \tilde{\chi}_i^+ \tilde{\chi}_i^-$, ($i=1,2$) and the subsequent leptonic decay of the lighter chargino $\tilde{\chi}_1^+ \to \tilde{\chi}_1^0 e^+ \nu_e$ including the complete spin correlations. Analytical formulae are given for the polarization and the spin-spin correlations of the charginos. Since the production is a pure QED process the decay dynamics can be studied separately. For high energy photons from Compton backscattering of polarized laser pulses off polarized electron beams numerical results are presented for the cross section, the angular distribution and the forward-backward asymmetry of the decay positron. Finally we study the dependence on the gaugino mass parameter $M_1$ and on the sneutrino mass for a gaugino-like MSSM scenario. |
hep-ph/9301252 | David Bowser-Chao | David Bowser-Chao and Kingman Cheung | Detection of the heavy Higgs boson at $\gamma\gamma$ colliders | 18 pages (in RevTeX) plus Postscript figures (available by email or
FAX), NUHEP-TH-92-29 and DOE-309-CPP-47. (Revised version: NO CHANGES to the
manuscript, simply removed corrupted figure files) | Phys.Rev. D48 (1993) 89-95 | 10.1103/PhysRevD.48.89 | null | hep-ph | null | We consider the possibility of detecting a heavy Higgs boson ($m_H>2m_Z$) in
proposed $\gamma\gamma$ colliders through the semi-leptonic mode $\gamma\gamma
\rightarrow H \rightarrow ZZ \rightarrow q\bar q \ell^+\ell^-$. We show that
due to the non-monochromatic nature of the photon beams produced by the
laser-backscattering method, the resultant cross section for Higgs production
is much smaller than the on-resonance cross section and generally {\it
decreases} with increasing collider energy. Although continuum $ZZ$ production
is expected to be negligible, we demonstrate the presence of and calculate
sizeable backgrounds from $\gamma\gamma\rightarrow \ell^+\ell^-Z,\,q\bar qZ$,
with $Z\rightarrow q\bar q,\,\ell^+\ell^-$, respectively, and
$\gamma\gamma\rightarrow t\bar t\rightarrow b\bar b\ell^+\ell^-\nu\bar\nu$.
This channel may be used to detect a Higgs of mass $m_H$ up to around 350~GeV
at a 0.5~TeV $e^+e^-$ collider, assuming a nominal yearly luminosity of
10--20~fb$^{-1}$.
| [
{
"created": "Wed, 20 Jan 1993 21:13:46 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Jan 1993 16:49:56 GMT",
"version": "v2"
}
] | 2009-10-22 | [
[
"Bowser-Chao",
"David",
""
],
[
"Cheung",
"Kingman",
""
]
] | We consider the possibility of detecting a heavy Higgs boson ($m_H>2m_Z$) in proposed $\gamma\gamma$ colliders through the semi-leptonic mode $\gamma\gamma \rightarrow H \rightarrow ZZ \rightarrow q\bar q \ell^+\ell^-$. We show that due to the non-monochromatic nature of the photon beams produced by the laser-backscattering method, the resultant cross section for Higgs production is much smaller than the on-resonance cross section and generally {\it decreases} with increasing collider energy. Although continuum $ZZ$ production is expected to be negligible, we demonstrate the presence of and calculate sizeable backgrounds from $\gamma\gamma\rightarrow \ell^+\ell^-Z,\,q\bar qZ$, with $Z\rightarrow q\bar q,\,\ell^+\ell^-$, respectively, and $\gamma\gamma\rightarrow t\bar t\rightarrow b\bar b\ell^+\ell^-\nu\bar\nu$. This channel may be used to detect a Higgs of mass $m_H$ up to around 350~GeV at a 0.5~TeV $e^+e^-$ collider, assuming a nominal yearly luminosity of 10--20~fb$^{-1}$. |
1104.4533 | Nodoka Yamanaka | Nodoka Yamanaka, Toru Sato and Takahiro Kubota | Constraint on R-parity violating MSSM at the one-loop level from CP-odd
N-N interaction | To appear in the proceedings of International conference on the
structure of baryons: BARYONS'10, Osaka, Japan, 7-11 Dec 2010 | null | 10.1063/1.3647379 | OU-HET-704 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Minimal supersymmetric standard model with R-parity violation (RPVMSSM)
contributes to the P-, CP-odd four-quark interaction. The P-, CP-odd four-quark
interaction is constrained by the new 199Hg EDM experimental data. It is then
possible to constrain R-parity violating (RPV) couplings from the 199Hg EDM
data. In this talk, we analyze the RPV contribution to the P-, CP-odd four-
quark interaction at the one-loop level to give constraints on RPV parameters.
| [
{
"created": "Sat, 23 Apr 2011 06:15:05 GMT",
"version": "v1"
}
] | 2015-05-27 | [
[
"Yamanaka",
"Nodoka",
""
],
[
"Sato",
"Toru",
""
],
[
"Kubota",
"Takahiro",
""
]
] | Minimal supersymmetric standard model with R-parity violation (RPVMSSM) contributes to the P-, CP-odd four-quark interaction. The P-, CP-odd four-quark interaction is constrained by the new 199Hg EDM experimental data. It is then possible to constrain R-parity violating (RPV) couplings from the 199Hg EDM data. In this talk, we analyze the RPV contribution to the P-, CP-odd four- quark interaction at the one-loop level to give constraints on RPV parameters. |
1106.4545 | Christoph Englert | Christoph Englert, Tuhin S. Roy, Michael Spannowsky | Ditau jets in Higgs searches | 9 pages, 9 figures. References added, typos corrected, published
version | null | 10.1103/PhysRevD.84.075026 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Understanding and identifying ditau jets -- jets consisting of pairs of tau
particles, can be of crucial importance and may even turn out to be a necessity
if the Higgs boson decays dominantly to new light scalars which, on the other
hand, decay to tau pairs. As often seen in various models of BSM such as in the
NMSSM, Higgs portals etc., the lightness of these new states ensures their
large transverse momenta and, as a consequence, the collinearity of their decay
products. We show that the non-standard signatures of these objects, which can
easily be missed by standard analysis techniques, can be superbly exploited in
an analysis based on subjet observables. When combined with additional
selection strategies, this analysis can even facilitate an early discovery of
the Higgs boson. To be specific, a light Higgs can be found with $S/\sqrt{B}
\gtrsim 5$ from $\mathcal {L} \simeq 12 fb^{-1}$ of data. We combine all these
observables into a single discriminating likelihood that can be employed toward
the construction of a realistic and standalone ditau tagger.
| [
{
"created": "Wed, 22 Jun 2011 20:00:01 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Oct 2011 09:29:52 GMT",
"version": "v2"
}
] | 2013-05-29 | [
[
"Englert",
"Christoph",
""
],
[
"Roy",
"Tuhin S.",
""
],
[
"Spannowsky",
"Michael",
""
]
] | Understanding and identifying ditau jets -- jets consisting of pairs of tau particles, can be of crucial importance and may even turn out to be a necessity if the Higgs boson decays dominantly to new light scalars which, on the other hand, decay to tau pairs. As often seen in various models of BSM such as in the NMSSM, Higgs portals etc., the lightness of these new states ensures their large transverse momenta and, as a consequence, the collinearity of their decay products. We show that the non-standard signatures of these objects, which can easily be missed by standard analysis techniques, can be superbly exploited in an analysis based on subjet observables. When combined with additional selection strategies, this analysis can even facilitate an early discovery of the Higgs boson. To be specific, a light Higgs can be found with $S/\sqrt{B} \gtrsim 5$ from $\mathcal {L} \simeq 12 fb^{-1}$ of data. We combine all these observables into a single discriminating likelihood that can be employed toward the construction of a realistic and standalone ditau tagger. |
hep-ph/9608430 | David London | M. Gronau and D. London | New Physics in CP Asymmetries and Rare B Decays | 42 pages, plain TeX (macros included), 1 figure (included). A few
sentences added, references updated. Present manuscript is now identical to
the version accepted for publication in Phys. Rev. D | Phys.Rev.D55:2845-2861,1997 | 10.1103/PhysRevD.55.2845 | TECHNION-PH-96-37, UdeM-GPP-TH-96-39 | hep-ph | null | We review and update the effects of physics beyond the standard model on CP
asymmetries in B decays. These asymmetries can be significantly altered if
there are important new-physics contributions to \bqbqbar mixing. This same new
physics will therefore also contribute to rare, flavor-changing B decays.
Through a study of such decays, we show that it is possible to partially
distinguish the different models of new physics.
| [
{
"created": "Fri, 23 Aug 1996 19:42:35 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Dec 1996 02:46:23 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Gronau",
"M.",
""
],
[
"London",
"D.",
""
]
] | We review and update the effects of physics beyond the standard model on CP asymmetries in B decays. These asymmetries can be significantly altered if there are important new-physics contributions to \bqbqbar mixing. This same new physics will therefore also contribute to rare, flavor-changing B decays. Through a study of such decays, we show that it is possible to partially distinguish the different models of new physics. |
hep-ph/0501281 | Gabor Domokos | S. Kovesi-Domokos, G. Domokos (Johns Hopkins University) | The Mysteries of the Highest Energy Cosmic Rays | LaTeX 2e, 9 pages, no figures. Invited talk given at XIII ISVHECRI,
Pylos, Greece | null | 10.1016/j.nuclphysbps.2005.07.007 | null | hep-ph | null | We give a summary of the theoretical attempts to make sense of the
observational data concerning the highest energy cosmic rays, (E > 3x10^{19}
eV).
| [
{
"created": "Sun, 30 Jan 2005 19:05:43 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Kovesi-Domokos",
"S.",
"",
"Johns Hopkins University"
],
[
"Domokos",
"G.",
"",
"Johns Hopkins University"
]
] | We give a summary of the theoretical attempts to make sense of the observational data concerning the highest energy cosmic rays, (E > 3x10^{19} eV). |
2008.08002 | Zhiguang Xiao | Zhi-Yong Zhou, Zhiguang Xiao | Two-pole structures in a relativistic Friedrichs-Lee-QPC scheme | 9 pages, 4 figure; Major revisions, figures added, more discussions
and references are added; Published version | Eur.Phys.J.C 81 (2021) 6, 551 | 10.1140/epjc/s10052-021-09329-9 | null | hep-ph hep-ex hep-lat nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A general appearance of two-pole structures is exhibited in a relativistic
Friedrichs-Lee model combined with a relativistic quark pair creation model in
a consistent manner. This kind of two-pole structure could be found when a
$q\bar q$ state couples to the open-flavor continuum state in the $S$ partial
wave. We found that many enigmatic states, such as $f_0(500)/\sigma$,
$K_0^*(700)/\kappa$, $a_0(980)$, $f_0(980)$, $D_0^*(2300)$, $D_{s0}^*(2317)$,
and $X(3872)$, together with another higher state for each, all result from
this kind of two-pole structures. Furthermore, an interesting observation is
that this kind of two-pole structure will contribute roughly a total of
180$^\circ$ phase shift for the scattering process in a single channel
approximation. This relativistic scheme may provide more insights into the
understanding of the properties of non-$q\bar q$ state. It is also suggested
that such two-pole structure could be a common phenomenon which deserves
studying both from theoretical and experimental perspectives.
| [
{
"created": "Tue, 18 Aug 2020 16:17:03 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Aug 2020 17:02:43 GMT",
"version": "v2"
},
{
"created": "Tue, 13 Jul 2021 14:16:59 GMT",
"version": "v3"
}
] | 2021-07-21 | [
[
"Zhou",
"Zhi-Yong",
""
],
[
"Xiao",
"Zhiguang",
""
]
] | A general appearance of two-pole structures is exhibited in a relativistic Friedrichs-Lee model combined with a relativistic quark pair creation model in a consistent manner. This kind of two-pole structure could be found when a $q\bar q$ state couples to the open-flavor continuum state in the $S$ partial wave. We found that many enigmatic states, such as $f_0(500)/\sigma$, $K_0^*(700)/\kappa$, $a_0(980)$, $f_0(980)$, $D_0^*(2300)$, $D_{s0}^*(2317)$, and $X(3872)$, together with another higher state for each, all result from this kind of two-pole structures. Furthermore, an interesting observation is that this kind of two-pole structure will contribute roughly a total of 180$^\circ$ phase shift for the scattering process in a single channel approximation. This relativistic scheme may provide more insights into the understanding of the properties of non-$q\bar q$ state. It is also suggested that such two-pole structure could be a common phenomenon which deserves studying both from theoretical and experimental perspectives. |
2306.13900 | Gilberto Ramalho | G. Ramalho and M.T. Pe\~na | Electromagnetic Transition Form Factors of Baryon Resonances | Published in Prog.Part.Nucl.Phys. Version with larger fonts. 124
pages, 41 figures, 6 tables. Small corrections in the text. Updated
bibliography | Prog.Part.Nucl.Phys. 136, 104097 (2024) | 10.1016/j.ppnp.2024.104097 | null | hep-ph hep-ex hep-lat nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent experimental and theoretical advancements have led to significant
progress in our understanding of the electromagnetic structure of nucleons
($N$), nucleon excitations ($N^\ast$), and other baryons. These breakthroughs
have been made possible by the capabilities of modern facilities, enabling the
induction of photo- and electro-excitation of nucleon resonances. Recent
experimental advances have sparked notable developments in theoretical
approaches. New theoretical methods have been tested and proven to be robust,
marking the beginning of a new era in our understanding on baryons. We present
a comprehensive review of progress in experimental data on $\gamma^\ast N \to
N^\ast$ reactions. Additionally, we discuss various analyses and theoretical
results. Some of these methods have matured in their predictive power, offering
new perspectives on exotic hadrons with multiquark components. We place special
emphasis on both the low-$Q^2$ and large-$Q^2$ regions to reinforce crucial
physical constraints on observables that hold in these limits. Furthermore, we
illustrate that the combination of lattice QCD with chiral effective field
theory and quark models, respectively, proves beneficial in interpreting data
and applying constraints within those different regimes. As a practical
contribution and for future reference, we review the formulas for helicity
amplitudes, multipole form factors and the relations between these two sets of
functions for transitions to resonances with general spin $J \geq \frac{1}{2}$.
These formulas are ubiquitous and play a pivotal role in experimental and
theoretical studies on baryon structure. Notably, the multipole transition form
factors for $J \ge \frac{3}{2}$ resonances serve as valuable tools to test
perturbative QCD results in the large-$Q^2$ region, thanks to the correlations
between electric and magnetic transition form factors.
| [
{
"created": "Sat, 24 Jun 2023 08:29:55 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Mar 2024 09:10:19 GMT",
"version": "v2"
}
] | 2024-03-12 | [
[
"Ramalho",
"G.",
""
],
[
"Peña",
"M. T.",
""
]
] | Recent experimental and theoretical advancements have led to significant progress in our understanding of the electromagnetic structure of nucleons ($N$), nucleon excitations ($N^\ast$), and other baryons. These breakthroughs have been made possible by the capabilities of modern facilities, enabling the induction of photo- and electro-excitation of nucleon resonances. Recent experimental advances have sparked notable developments in theoretical approaches. New theoretical methods have been tested and proven to be robust, marking the beginning of a new era in our understanding on baryons. We present a comprehensive review of progress in experimental data on $\gamma^\ast N \to N^\ast$ reactions. Additionally, we discuss various analyses and theoretical results. Some of these methods have matured in their predictive power, offering new perspectives on exotic hadrons with multiquark components. We place special emphasis on both the low-$Q^2$ and large-$Q^2$ regions to reinforce crucial physical constraints on observables that hold in these limits. Furthermore, we illustrate that the combination of lattice QCD with chiral effective field theory and quark models, respectively, proves beneficial in interpreting data and applying constraints within those different regimes. As a practical contribution and for future reference, we review the formulas for helicity amplitudes, multipole form factors and the relations between these two sets of functions for transitions to resonances with general spin $J \geq \frac{1}{2}$. These formulas are ubiquitous and play a pivotal role in experimental and theoretical studies on baryon structure. Notably, the multipole transition form factors for $J \ge \frac{3}{2}$ resonances serve as valuable tools to test perturbative QCD results in the large-$Q^2$ region, thanks to the correlations between electric and magnetic transition form factors. |
hep-ph/9601241 | Hans-Peter Nilles | Hans Peter Nilles | Dynamical Gauge Coupling Constants | Lectures given at the 1995 Trieste Summer School, LaTeX, 24 pages, 3
postscript figures included | null | null | TUM--HEP--234/96, SFB--375/28 | hep-ph hep-th | null | In string theory the coupling parameters are functions of moduli fields. The
actual values of the coupling constants are then dynamically determined through
the vacuum expextation values of these fields. We review the attempts to
connect such theories to low energy effective field theories with realistic
gauge coupling constants. This includes a discussion of supersymmetry
breakdown, the question of a running dilaton, string threshold calculations and
the possibility of string unification.
| [
{
"created": "Thu, 11 Jan 1996 10:06:55 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Nilles",
"Hans Peter",
""
]
] | In string theory the coupling parameters are functions of moduli fields. The actual values of the coupling constants are then dynamically determined through the vacuum expextation values of these fields. We review the attempts to connect such theories to low energy effective field theories with realistic gauge coupling constants. This includes a discussion of supersymmetry breakdown, the question of a running dilaton, string threshold calculations and the possibility of string unification. |
hep-ph/0312147 | Jae-hyeon Park | P. Ko (1), Jungil Lee (2 and 3), Taekoon Lee (4), Jae-hyeon Park (1)
((1) KAIST, (2) KIAS, (3) Argonne, (4) SNU) | Chiral perturbation theory for pentaquark baryons and its applications | 4 pages | Phys.Lett. B611 (2005) 87-92 | 10.1016/j.physletb.2005.02.031 | ANL-HEP-PR-03-102, KAIST-TH 2003/11, KIAS-P03085 | hep-ph hep-ex nucl-th | null | We construct a chiral lagrangian for pentaquark baryons assuming that the
recently found Theta^+ (1540) state belongs to an antidecuplet of SU(3) flavor
symmetry with J^P = (1/2)^(+-). We derive the Gell-Mann-Okubo formulae for the
antidecuplet baryon masses, and a possible mixing between the antidecuplet and
the pentaquark octet. Then we calculate the cross sections for pi^- p -> K^-
Theta^+ and gamma n -> K^- Theta^+ using our chiral lagrangian. The resulting
amplitudes respect the underlying chiral symmetry of QCD correctly. We also
describe how to include the light vector mesons in the chiral lagrangian.
| [
{
"created": "Thu, 11 Dec 2003 03:27:45 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Ko",
"P.",
"",
"KAIST"
],
[
"Lee",
"Jungil",
"",
"2 and 3"
],
[
"Lee",
"Taekoon",
"",
"SNU"
],
[
"Park",
"Jae-hyeon",
"",
"KAIST"
]
] | We construct a chiral lagrangian for pentaquark baryons assuming that the recently found Theta^+ (1540) state belongs to an antidecuplet of SU(3) flavor symmetry with J^P = (1/2)^(+-). We derive the Gell-Mann-Okubo formulae for the antidecuplet baryon masses, and a possible mixing between the antidecuplet and the pentaquark octet. Then we calculate the cross sections for pi^- p -> K^- Theta^+ and gamma n -> K^- Theta^+ using our chiral lagrangian. The resulting amplitudes respect the underlying chiral symmetry of QCD correctly. We also describe how to include the light vector mesons in the chiral lagrangian. |
1607.01701 | C. A. Dominguez | C. A. Dominguez, L. A. Hernandez, K. Schilcher, and H. Spiesberger | Quark-hadron duality: pinched kernel approch | Invited talk given by K. Schilcher at the International Workshop on
Determination of the Fundamental Parameters in QCD. Mainz Institute of
Theoretical Physics, Johannes Gutenberg University of Mainz, Mainz, Germany | null | 10.1142/S0217732316300263 | null | hep-ph hep-ex hep-lat hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Hadronic spectral functions measured by the ALEPH collaboration in the vector
and axial-vector channels are used to study potential quark-hadron duality
violations (DV). This is done entirely in the framework of pinched kernel
finite energy sum rules (FESR), i.e. in a model independent fashion. The
kinematical range of the ALEPH data is effectively extended up to $s = 10\;
{\mbox{GeV}^2}$ by using an appropriate kernel, and assuming that in this
region the spectral functions are given by perturbative QCD. Support for this
assumption is obtained by using $e^+ e^-$ annihilation data in the vector
channel. Results in both channels show a good saturation of the pinched FESR,
without further need of explicit models of DV.
| [
{
"created": "Wed, 6 Jul 2016 16:32:42 GMT",
"version": "v1"
}
] | 2016-09-21 | [
[
"Dominguez",
"C. A.",
""
],
[
"Hernandez",
"L. A.",
""
],
[
"Schilcher",
"K.",
""
],
[
"Spiesberger",
"H.",
""
]
] | Hadronic spectral functions measured by the ALEPH collaboration in the vector and axial-vector channels are used to study potential quark-hadron duality violations (DV). This is done entirely in the framework of pinched kernel finite energy sum rules (FESR), i.e. in a model independent fashion. The kinematical range of the ALEPH data is effectively extended up to $s = 10\; {\mbox{GeV}^2}$ by using an appropriate kernel, and assuming that in this region the spectral functions are given by perturbative QCD. Support for this assumption is obtained by using $e^+ e^-$ annihilation data in the vector channel. Results in both channels show a good saturation of the pinched FESR, without further need of explicit models of DV. |
1109.1282 | Ioannis Iatrakis Mr. | Ioannis Iatrakis, Elias Kiritsis | Vector-axial vector correlators in weak electric field and the
holographic dynamics of the chiral condensate | 17 pages, 5 figures, typos corrected | null | 10.1007/JHEP02(2012)064 | CCTP-2011-28 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The transverse part of the vector-axial vector flavor current correlator in
the presence of weak external electric field is studied using holography. The
correlator is calculated using a bottom-up model arxiv:1003.2377 {proposed
recently}, that includes the non-linear dynamics of the chiral condensate. It
is shown that for low momenta the result agrees with the relation proposed by
arXiv:1010.0718 {Son and Yamamoto} motivated by a simpler holographic model.
For large Euclidean momenta however, the two results diverge. In the process,
the difference of the vector and axial vector two point functions is also
calculated. At large Euclidean momenta it is found that the first
non-perturbative contribution, decreases as $q^{-6}$ as expected from QCD.
| [
{
"created": "Tue, 6 Sep 2011 20:00:01 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Sep 2011 14:22:26 GMT",
"version": "v2"
}
] | 2015-05-30 | [
[
"Iatrakis",
"Ioannis",
""
],
[
"Kiritsis",
"Elias",
""
]
] | The transverse part of the vector-axial vector flavor current correlator in the presence of weak external electric field is studied using holography. The correlator is calculated using a bottom-up model arxiv:1003.2377 {proposed recently}, that includes the non-linear dynamics of the chiral condensate. It is shown that for low momenta the result agrees with the relation proposed by arXiv:1010.0718 {Son and Yamamoto} motivated by a simpler holographic model. For large Euclidean momenta however, the two results diverge. In the process, the difference of the vector and axial vector two point functions is also calculated. At large Euclidean momenta it is found that the first non-perturbative contribution, decreases as $q^{-6}$ as expected from QCD. |
1202.0740 | Philippe Brax | Philippe Brax | Lorentz Invariance Violation in Modified Gravity | 8 pages, extended discussion | null | 10.1016/j.physletb.2012.05.005 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider an environmentally dependent violation of Lorentz invariance in
scalar-tensor models of modified gravity where General Relativity is retrieved
locally thanks to a screening mechanism. We find that fermions have a modified
dispersion relation and would go faster than light in an anisotropic and
space-dependent way along the scalar field lines of force. Phenomenologically,
these models are tightly restricted by the amount of Cerenkov radiation emitted
by the superluminal particles, a constraint which is only satisfied by
chameleons. Measuring the speed of neutrinos emitted radially from the surface
of the earth and observed on the other side of the earth would probe the scalar
field profile of modified gravity models in dense environments. We argue that
the test of the equivalence principle provided by the Lunar ranging experiment
implies that a deviation from the speed of light, for natural values of the
coupling scale between the scalar field and fermions, would be below detectable
levels, unless gravity is modified by camouflaged chameleons where the field
normalisation is environmentally dependent.
| [
{
"created": "Fri, 3 Feb 2012 15:46:50 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Feb 2012 21:08:30 GMT",
"version": "v2"
},
{
"created": "Mon, 27 Feb 2012 13:06:42 GMT",
"version": "v3"
},
{
"created": "Thu, 10 May 2012 12:38:19 GMT",
"version": "v4"
}
] | 2015-06-04 | [
[
"Brax",
"Philippe",
""
]
] | We consider an environmentally dependent violation of Lorentz invariance in scalar-tensor models of modified gravity where General Relativity is retrieved locally thanks to a screening mechanism. We find that fermions have a modified dispersion relation and would go faster than light in an anisotropic and space-dependent way along the scalar field lines of force. Phenomenologically, these models are tightly restricted by the amount of Cerenkov radiation emitted by the superluminal particles, a constraint which is only satisfied by chameleons. Measuring the speed of neutrinos emitted radially from the surface of the earth and observed on the other side of the earth would probe the scalar field profile of modified gravity models in dense environments. We argue that the test of the equivalence principle provided by the Lunar ranging experiment implies that a deviation from the speed of light, for natural values of the coupling scale between the scalar field and fermions, would be below detectable levels, unless gravity is modified by camouflaged chameleons where the field normalisation is environmentally dependent. |
1101.5024 | Barbara Sciascia | B. Sciascia (for the FlaviaNet Kaon Working Group) | Vus and precise Standard Model tests | 5 pages, Proceedings of CKM2010, the 6th International Workshop on
the CKM Unitarity Triangle, University of Warwick, UK, 6-10 September 2010 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The recent significant progress on both the experimental and theoretical
sides on the study of leptonic and semileptonic kaon decays allows to precisely
test the Standard Model. Here we present results for the determination of Vus
from experimental data, the comparison between the values of Vus obtained from
data on semileptonic and leptonic kaon decays, and tests of lepton universality
in semileptonic kaon decays.
| [
{
"created": "Wed, 26 Jan 2011 11:07:49 GMT",
"version": "v1"
}
] | 2019-08-14 | [
[
"Sciascia",
"B.",
"",
"for the FlaviaNet Kaon Working Group"
]
] | The recent significant progress on both the experimental and theoretical sides on the study of leptonic and semileptonic kaon decays allows to precisely test the Standard Model. Here we present results for the determination of Vus from experimental data, the comparison between the values of Vus obtained from data on semileptonic and leptonic kaon decays, and tests of lepton universality in semileptonic kaon decays. |
hep-ph/0307294 | Tancredi Carli | Tancredi Carli | Observation of Events with Isolated Charged Leptons and Large Missing
Tra nsverse Momentum and of Events with Multi-Electrons at HERA | talk given at 38th Recontres de Moriond Electroweak Interactions and
Unified Theories, Les Arc (France) 2003 | null | null | null | hep-ph | null | Striking events with isolated charged leptons, large missing transverse
momentum and large transverse momentum of the hadronic final state (PTX) have
been observed at the electron proton collider HERA. In the full HERA-I data
sample corresponding to an integrated luminosity of about 130 invpb, the H1
experiment observes 10 events with isolated electrons or muons and with PTX >25
GeV. Only 2.9 pm 0.4 events are expected from Standard Model (SM) processes.
Six of these events have PTX >40 GeV, while 1.1 pm 0.2 events are expected. The
ZEUS experiment observes good agreement with the SM. However, in a preliminary
search ZEUS has found two events with a similar event topology, but tau-leptons
instead of electrons or muons in the final state . Only 0.12 pm 0.02 events are
expected from SM processes.
Moreover, six events with two or more electrons forming an invariant mass
bigger than 100 GeV have been observed by the H1 experiment. Three events have
two electrons and three events have three electrons, while only 0.25 events are
expected in each case. The ZEUS measurement is in agreement with the SM
expectation.
| [
{
"created": "Wed, 23 Jul 2003 14:23:42 GMT",
"version": "v1"
},
{
"created": "Thu, 31 Jul 2003 10:32:07 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Carli",
"Tancredi",
""
]
] | Striking events with isolated charged leptons, large missing transverse momentum and large transverse momentum of the hadronic final state (PTX) have been observed at the electron proton collider HERA. In the full HERA-I data sample corresponding to an integrated luminosity of about 130 invpb, the H1 experiment observes 10 events with isolated electrons or muons and with PTX >25 GeV. Only 2.9 pm 0.4 events are expected from Standard Model (SM) processes. Six of these events have PTX >40 GeV, while 1.1 pm 0.2 events are expected. The ZEUS experiment observes good agreement with the SM. However, in a preliminary search ZEUS has found two events with a similar event topology, but tau-leptons instead of electrons or muons in the final state . Only 0.12 pm 0.02 events are expected from SM processes. Moreover, six events with two or more electrons forming an invariant mass bigger than 100 GeV have been observed by the H1 experiment. Three events have two electrons and three events have three electrons, while only 0.25 events are expected in each case. The ZEUS measurement is in agreement with the SM expectation. |
1807.11498 | Kyoungchul Kong | Jeong Han Kim, Kyoungchul Kong, Konstantin T. Matchev, Myeonghun Park | Probing the Triple Higgs Self-Interaction at the Large Hadron Collider | 5 pages, 5 figures, matches the published version | Phys. Rev. Lett. 122, 091801 (2019) | 10.1103/PhysRevLett.122.091801 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a novel kinematic method to expedite the discovery of the double
Higgs ($hh$) production in the $\ell^+\ell^- b \bar{b} + E_T \hspace{-0.52cm}
\big / ~$ final state. We make full use of recently developed kinematic
variables, as well as the variables $\it Topness$ for the dominant background
(top quark pair production) and $\it Higgsness$ for the signal. We obtain a
significant increase in sensitivity compared to the previous analyses which
used sophisticated algorithms like boosted decision trees or neutral networks.
The method can be easily generalized to resonant $hh$ production as well as
other non-resonant channels.
| [
{
"created": "Mon, 30 Jul 2018 18:00:16 GMT",
"version": "v1"
},
{
"created": "Fri, 8 Mar 2019 15:51:59 GMT",
"version": "v2"
}
] | 2019-03-13 | [
[
"Kim",
"Jeong Han",
""
],
[
"Kong",
"Kyoungchul",
""
],
[
"Matchev",
"Konstantin T.",
""
],
[
"Park",
"Myeonghun",
""
]
] | We propose a novel kinematic method to expedite the discovery of the double Higgs ($hh$) production in the $\ell^+\ell^- b \bar{b} + E_T \hspace{-0.52cm} \big / ~$ final state. We make full use of recently developed kinematic variables, as well as the variables $\it Topness$ for the dominant background (top quark pair production) and $\it Higgsness$ for the signal. We obtain a significant increase in sensitivity compared to the previous analyses which used sophisticated algorithms like boosted decision trees or neutral networks. The method can be easily generalized to resonant $hh$ production as well as other non-resonant channels. |
2307.04396 | Raghunath Sahoo | Kangkan Goswami, Kshitish Kumar Pradhan, Dushmanta Sahu, and Raghunath
Sahoo | Diffusion and fluctuations of open charmed hadrons in an interacting
hadronic medium | Same as the published version in Phys. Rev. D | Physical Review D 108, 074011 (2023) | 10.1103/PhysRevD.108.074011 | null | hep-ph hep-ex nucl-ex nucl-th | http://creativecommons.org/licenses/by-sa/4.0/ | Heavy quarks are excellent probes to understand the hot and dense medium
formed in ultra-relativistic collisions. In a hadronic medium, studying the
transport properties, e.g. the drag ($\gamma$), momentum diffusion ($B_{0}$),
and spatial diffusion ($D_{s}$) coefficients of open charmed hadrons can
provide useful information about the medium. Moreover, the fluctuations of
charmed hadrons can help us to locate the onset of their deconfinement. In this
work, we incorporate attractive and repulsive interactions in the
well-established van der Waals hadron resonance gas model (VDWHRG) and study
the diffusion and fluctuations of charmed hadrons. This study helps us
understand the importance of interactions in the system, which affect both the
diffusion and fluctuations of charmed hadrons.
| [
{
"created": "Mon, 10 Jul 2023 07:57:46 GMT",
"version": "v1"
},
{
"created": "Tue, 31 Oct 2023 07:04:30 GMT",
"version": "v2"
}
] | 2023-11-01 | [
[
"Goswami",
"Kangkan",
""
],
[
"Pradhan",
"Kshitish Kumar",
""
],
[
"Sahu",
"Dushmanta",
""
],
[
"Sahoo",
"Raghunath",
""
]
] | Heavy quarks are excellent probes to understand the hot and dense medium formed in ultra-relativistic collisions. In a hadronic medium, studying the transport properties, e.g. the drag ($\gamma$), momentum diffusion ($B_{0}$), and spatial diffusion ($D_{s}$) coefficients of open charmed hadrons can provide useful information about the medium. Moreover, the fluctuations of charmed hadrons can help us to locate the onset of their deconfinement. In this work, we incorporate attractive and repulsive interactions in the well-established van der Waals hadron resonance gas model (VDWHRG) and study the diffusion and fluctuations of charmed hadrons. This study helps us understand the importance of interactions in the system, which affect both the diffusion and fluctuations of charmed hadrons. |
0906.1803 | Michael Spannowsky | Tilman Plehn, Michael Rauch and Michael Spannowsky | Understanding Single Tops using Jets | null | Phys.Rev.D80:114027,2009 | 10.1103/PhysRevD.80.114027 | KA-TP-07-2009; SFB/CPP-09-47 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Top plus jets production at hadron collider allows us to study the couplings
of the top quark. In the Standard Model, two single top processes contribute to
the top-jets final state. Beyond the Standard Model, additional direct top
production can occur. All three processes probe top gauge couplings including
flavor mixing. The structure of accompanying QCD jets allows us to separate the
direct top signal from the QCD backgrounds as well as to disentangle the three
top plus jets production mechanisms orthogonally to the usual bottom tags.
| [
{
"created": "Tue, 9 Jun 2009 19:08:01 GMT",
"version": "v1"
}
] | 2010-01-07 | [
[
"Plehn",
"Tilman",
""
],
[
"Rauch",
"Michael",
""
],
[
"Spannowsky",
"Michael",
""
]
] | Top plus jets production at hadron collider allows us to study the couplings of the top quark. In the Standard Model, two single top processes contribute to the top-jets final state. Beyond the Standard Model, additional direct top production can occur. All three processes probe top gauge couplings including flavor mixing. The structure of accompanying QCD jets allows us to separate the direct top signal from the QCD backgrounds as well as to disentangle the three top plus jets production mechanisms orthogonally to the usual bottom tags. |
1003.3230 | Gilberto Tavares-Velasco | A. Moyotl, G. Tavares-Velasco | On-shell $WW\gamma$ vertex in the T-Parity and non T-Parity Littlest
Higgs model | 19 pages, 8 figures | J.Phys.G37:105012,2010 | 10.1088/0954-3899/37/10/105012 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The static electromagnetic properties of the $W$ boson, $\Delta \kappa$ and
$\Delta Q$, are calculated in the T-parity and non T-parity littlest Higgs
model (LHM) including terms up to the order of $(v/f)^4$, with $v$ the standard
model (SM) vacuum expectation value and $f$ the scale of the global symmetry
breaking. There are contributions from the virtual effects of the new heavy
particles and also from the new corrections to the SM vertices, which depend on
the mixing parameter $c$ and decrease quickly as $f$ increases. Depending on
the value of $c$, the partial contributions to $\Delta \kappa$ and $\Delta Q$
can add constructively or destructively. The terms of the order of $(v/f)^4$
are subdominant but they can add constructively and can enhance the $W$ form
factors for $f < 1$ TeV. In general the size of the $W$ form factors is very
suppressed in the LHM without T-parity as the constraints on the scale $f$ from
electroweak precision measurements are very tight. The LHM with T-parity has no
such constraints and it allows for values of $W$ form factors similar to those
found in other weakly coupled SM extensions, though they are out of the
expected sensitivity of future measurements at the LHC. We also discuss the
possibility that there is some enhancement due to the interactions arising from
the strongly interacting ultraviolet completion of the LHM.
| [
{
"created": "Tue, 16 Mar 2010 19:49:32 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Jun 2010 05:03:17 GMT",
"version": "v2"
}
] | 2015-03-13 | [
[
"Moyotl",
"A.",
""
],
[
"Tavares-Velasco",
"G.",
""
]
] | The static electromagnetic properties of the $W$ boson, $\Delta \kappa$ and $\Delta Q$, are calculated in the T-parity and non T-parity littlest Higgs model (LHM) including terms up to the order of $(v/f)^4$, with $v$ the standard model (SM) vacuum expectation value and $f$ the scale of the global symmetry breaking. There are contributions from the virtual effects of the new heavy particles and also from the new corrections to the SM vertices, which depend on the mixing parameter $c$ and decrease quickly as $f$ increases. Depending on the value of $c$, the partial contributions to $\Delta \kappa$ and $\Delta Q$ can add constructively or destructively. The terms of the order of $(v/f)^4$ are subdominant but they can add constructively and can enhance the $W$ form factors for $f < 1$ TeV. In general the size of the $W$ form factors is very suppressed in the LHM without T-parity as the constraints on the scale $f$ from electroweak precision measurements are very tight. The LHM with T-parity has no such constraints and it allows for values of $W$ form factors similar to those found in other weakly coupled SM extensions, though they are out of the expected sensitivity of future measurements at the LHC. We also discuss the possibility that there is some enhancement due to the interactions arising from the strongly interacting ultraviolet completion of the LHM. |
hep-ph/0612043 | Francois Arleo | Francois Arleo and Vi-Nham Tram | A systematic study of J/psi suppression in cold nuclear matter | 25 pages, 5 figures | Eur.Phys.J.C55:449-461,2008 | 10.1140/epjc/s10052-008-0604-8 | CERN-PH-TH/2006-189, LAPTH-1163/06 | hep-ph nucl-ex nucl-th | null | Based on a Glauber model, a statistical analysis of all mid-rapidity J/psi
hadroproduction and leptoproduction data on nuclear targets is carried out.
This allows us to determine the J/psi-nucleon inelastic cross section, whose
knowledge is crucial to interpret the J/psi suppression observed in heavy-ion
collisions, at SPS and at RHIC. The values of sigma are extracted from each
experiment. A clear tension between the different data sets is reported. The
global fit of all data gives sigma=3.4+/-0.2 mb, which is significantly smaller
than previous estimates. A similar value, sigma=3.5+/-0.2 mb, is obtained when
the nDS nuclear parton densities are included in the analysis, although we
emphasize that the present uncertainties on gluon (anti)shadowing do not allow
for a precise determination of sigma. Finally, no significant energy dependence
of the J/psi-N interaction is observed, unless strong nuclear modifications of
the parton densities are assumed.
| [
{
"created": "Tue, 5 Dec 2006 13:35:18 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Arleo",
"Francois",
""
],
[
"Tram",
"Vi-Nham",
""
]
] | Based on a Glauber model, a statistical analysis of all mid-rapidity J/psi hadroproduction and leptoproduction data on nuclear targets is carried out. This allows us to determine the J/psi-nucleon inelastic cross section, whose knowledge is crucial to interpret the J/psi suppression observed in heavy-ion collisions, at SPS and at RHIC. The values of sigma are extracted from each experiment. A clear tension between the different data sets is reported. The global fit of all data gives sigma=3.4+/-0.2 mb, which is significantly smaller than previous estimates. A similar value, sigma=3.5+/-0.2 mb, is obtained when the nDS nuclear parton densities are included in the analysis, although we emphasize that the present uncertainties on gluon (anti)shadowing do not allow for a precise determination of sigma. Finally, no significant energy dependence of the J/psi-N interaction is observed, unless strong nuclear modifications of the parton densities are assumed. |
1909.13804 | Ken-Ichi Okumura | Ken-ichi Okumura | Hide and Seek with Massive Fields in Modulus Mediation | 17 pages, 2 figures, accepted by Physical Review Letters | Phys. Rev. Lett. 123, 151801 (2019) | 10.1103/PhysRevLett.123.151801 | KYUSHU-RCAPP-2019-01, KYUSHU-HET-195 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the modulus mediation of supersymmetry breaking motivated by
superstring theory. We show that the renormalization group running of the soft
supersymmetry breaking parameters due to the interactions of massive fields is
canceled by the threshold corrections at one-loop order, if their mass is given
by nonperturbative dynamics controlled by the same modulus that mediates
supersymmetry breaking and a sum rule of the modular weights holds for the
Yukawa couplings. As an example, we discuss order reduction of lepton flavor
violation in the supersymmetric seesaw mechanism, which revives the parameter
space already excluded.
| [
{
"created": "Mon, 30 Sep 2019 16:00:03 GMT",
"version": "v1"
}
] | 2019-10-16 | [
[
"Okumura",
"Ken-ichi",
""
]
] | We study the modulus mediation of supersymmetry breaking motivated by superstring theory. We show that the renormalization group running of the soft supersymmetry breaking parameters due to the interactions of massive fields is canceled by the threshold corrections at one-loop order, if their mass is given by nonperturbative dynamics controlled by the same modulus that mediates supersymmetry breaking and a sum rule of the modular weights holds for the Yukawa couplings. As an example, we discuss order reduction of lepton flavor violation in the supersymmetric seesaw mechanism, which revives the parameter space already excluded. |
hep-ph/9805385 | Oleg Kalashnikov | O.K. Kalashnikov | One-particle and collective electron spectra in hot and dense QED and
their gauge dependence | 9 pages, latex, no figures | Mod.Phys.Lett.A13:1719-1728,1998 | 10.1142/S0217732398001790 | null | hep-ph | null | The one-particle electron spectrum is found for hot and dense QED and its
properties are investigated in comparison with the collective spectrum. It is
shown that the one-particle spectrum (in any case its zero momentum limit) is
gauge invariant, but the collective spectrum, being qualitatively different, is
always gauge dependent. The exception is the case $m,\mu=0$ for which the
collective spectrum long wavelength limit demonstrates the gauge invariance as
well.
| [
{
"created": "Wed, 20 May 1998 06:03:32 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Kalashnikov",
"O. K.",
""
]
] | The one-particle electron spectrum is found for hot and dense QED and its properties are investigated in comparison with the collective spectrum. It is shown that the one-particle spectrum (in any case its zero momentum limit) is gauge invariant, but the collective spectrum, being qualitatively different, is always gauge dependent. The exception is the case $m,\mu=0$ for which the collective spectrum long wavelength limit demonstrates the gauge invariance as well. |
0711.2364 | Kenji Fukushima | Kenji Fukushima | Randomness in infinitesimal extent in the McLerran-Venugopalan model | 11 pages, 11 figures, typos corrected; Introduction and Discussion
sections extended | Phys.Rev.D77:074005,2008 | 10.1103/PhysRevD.77.074005 | YITP-07-79 | hep-ph | null | We study discrepancy between the analytical definition and the numerical
implementation of the McLerran-Venugopalan (MV) model. The infinitesimal extent
of a fast-moving nucleus should retain longitudinal randomness in the color
source distribution even when the longitudinal extent approximates zero due to
the Lorentz contraction, which is properly taken into account in the analytical
treatment. We point out that the longitudinal randomness is lost in numerical
simulations because of lack of the path-ordering of the Wilson line along the
longitudinal direction. We quantitatively investigate how much the results with
and without longitudinal randomness differ from each other. We finally mention
that the discrepancy could be absorbed in a choice of the model parameter in
the physical unit, and nevertheless, it is important for a full theory
approach.
| [
{
"created": "Thu, 15 Nov 2007 18:15:08 GMT",
"version": "v1"
},
{
"created": "Sun, 20 Jan 2008 15:00:03 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Fukushima",
"Kenji",
""
]
] | We study discrepancy between the analytical definition and the numerical implementation of the McLerran-Venugopalan (MV) model. The infinitesimal extent of a fast-moving nucleus should retain longitudinal randomness in the color source distribution even when the longitudinal extent approximates zero due to the Lorentz contraction, which is properly taken into account in the analytical treatment. We point out that the longitudinal randomness is lost in numerical simulations because of lack of the path-ordering of the Wilson line along the longitudinal direction. We quantitatively investigate how much the results with and without longitudinal randomness differ from each other. We finally mention that the discrepancy could be absorbed in a choice of the model parameter in the physical unit, and nevertheless, it is important for a full theory approach. |
hep-ph/9712343 | Tony Gherghetta | Tony Gherghetta | The Role of Scalar and Pseudoscalar Fields in Determining
Nucleosynthesis Bounds on the Scale of Supersymmetry Breaking | 12 pages, 1 figure; Version to be published in Phys. Lett. B | Phys.Lett. B423 (1998) 311-318 | 10.1016/S0370-2693(98)00129-4 | CERN-TH/97-361 | hep-ph astro-ph | null | The effect of spin-0 goldstino superpartners is considered on the
nucleosynthesis bounds arising when a superlight gravitino appears as an
effective massless neutrino species. When the scalar and pseudoscalar
superpartners are relativistic they will decouple at much later times than the
goldstino and consequently will be the dominant effect when obtaining a
nucleosynthesis bound on the scale of supersymmetry breaking. Assuming that the
scalar and pseudoscalar fields decouple at a temperature no later than O(100)
MeV, then typically the scale of supersymmetry breaking \sqrt{F} > 60 TeV. This
corresponds to a lower bound on the gravitino mass m_{3/2} > 1 eV.
| [
{
"created": "Thu, 11 Dec 1997 11:23:31 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Feb 1998 14:26:41 GMT",
"version": "v2"
}
] | 2009-10-30 | [
[
"Gherghetta",
"Tony",
""
]
] | The effect of spin-0 goldstino superpartners is considered on the nucleosynthesis bounds arising when a superlight gravitino appears as an effective massless neutrino species. When the scalar and pseudoscalar superpartners are relativistic they will decouple at much later times than the goldstino and consequently will be the dominant effect when obtaining a nucleosynthesis bound on the scale of supersymmetry breaking. Assuming that the scalar and pseudoscalar fields decouple at a temperature no later than O(100) MeV, then typically the scale of supersymmetry breaking \sqrt{F} > 60 TeV. This corresponds to a lower bound on the gravitino mass m_{3/2} > 1 eV. |
hep-ph/0603067 | J. A. R. Cembranos | Jose A. R. Cembranos, Jonathan L. Feng, Arvind Rajaraman, Bryan T.
Smith, Fumihiro Takayama | Collider Signatures of SuperWIMP Warm Dark Matter | Contributed to the 2005 International Linear Collider Physics and
Detector Workshop and 2nd ILC Accelerator Workshop, Snowmass, Colorado, 14-27
Aug 2005. 3 pages, LaTeX, 1 figure | ECONFC0508141:ALCPG0334,2005 | null | UCI-TR-2005-43, SNOWMASS-2005-ALCPG0334 | hep-ph | null | SuperWeakly-Interacting Massive Particles (superWIMPs) produced in the late
decays of other particles are well-motivated dark matter candidates and may be
favored over standard Weakly-Interacting Massive Particles (WIMPs) by small
scale structure observations. Among the most promising frameworks that
incorporate superWIMPs are R-parity conserving supersymmetry models in which
the lightest supersymmetric particle (LSP) is the gravitino or the axino. In
these well-defined particle models, astrophysical observations have direct
implications for possible measurements at future colliders.
| [
{
"created": "Thu, 9 Mar 2006 01:52:45 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Cembranos",
"Jose A. R.",
""
],
[
"Feng",
"Jonathan L.",
""
],
[
"Rajaraman",
"Arvind",
""
],
[
"Smith",
"Bryan T.",
""
],
[
"Takayama",
"Fumihiro",
""
]
] | SuperWeakly-Interacting Massive Particles (superWIMPs) produced in the late decays of other particles are well-motivated dark matter candidates and may be favored over standard Weakly-Interacting Massive Particles (WIMPs) by small scale structure observations. Among the most promising frameworks that incorporate superWIMPs are R-parity conserving supersymmetry models in which the lightest supersymmetric particle (LSP) is the gravitino or the axino. In these well-defined particle models, astrophysical observations have direct implications for possible measurements at future colliders. |
1410.6434 | Daniele Teresi | P.S. Bhupal Dev, Peter Millington, Apostolos Pilaftsis, Daniele Teresi | Kadanoff-Baym Approach to Flavour Mixing and Oscillations in Resonant
Leptogenesis | 35 pages, 4 figures; further discussion added and typos corrected;
final published version | Nucl. Phys. B 891 (2015) 128-158 | 10.1016/j.nuclphysb.2014.12.003 | MAN/HEP/2014/13, TUM-HEP-962-14 | hep-ph astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We describe a loopwise perturbative truncation scheme for quantum transport
equations in the Kadanoff-Baym formalism, which does not necessitate the use of
the so-called Kadanoff-Baym or quasi-particle ansaetze for dressed propagators.
This truncation scheme is used to study flavour effects in the context of
Resonant Leptogenesis (RL), showing explicitly that, in the weakly-resonant
regime, there exist two distinct and pertinent flavour effects in the
heavy-neutrino sector: (i) the resonant mixing and (ii) the oscillations
between different heavy-neutrino flavours. Moreover, we illustrate that
Kadanoff-Baym and quasi-particle ansaetze, whilst appropriate for the
flavour-singlet dressed charged-lepton and Higgs propagators of the RL
scenario, should not be applied to the dressed heavy-neutrino propagators. The
use of these approximations for the latter is shown to capture only flavour
oscillations, whilst discarding the separate phenomenon of flavour mixing.
| [
{
"created": "Thu, 23 Oct 2014 18:01:06 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Dec 2014 16:25:42 GMT",
"version": "v2"
}
] | 2014-12-23 | [
[
"Dev",
"P. S. Bhupal",
""
],
[
"Millington",
"Peter",
""
],
[
"Pilaftsis",
"Apostolos",
""
],
[
"Teresi",
"Daniele",
""
]
] | We describe a loopwise perturbative truncation scheme for quantum transport equations in the Kadanoff-Baym formalism, which does not necessitate the use of the so-called Kadanoff-Baym or quasi-particle ansaetze for dressed propagators. This truncation scheme is used to study flavour effects in the context of Resonant Leptogenesis (RL), showing explicitly that, in the weakly-resonant regime, there exist two distinct and pertinent flavour effects in the heavy-neutrino sector: (i) the resonant mixing and (ii) the oscillations between different heavy-neutrino flavours. Moreover, we illustrate that Kadanoff-Baym and quasi-particle ansaetze, whilst appropriate for the flavour-singlet dressed charged-lepton and Higgs propagators of the RL scenario, should not be applied to the dressed heavy-neutrino propagators. The use of these approximations for the latter is shown to capture only flavour oscillations, whilst discarding the separate phenomenon of flavour mixing. |
1603.08786 | Henry Tsz-King Wong | S. Kerman, V. Sharma, M. Deniz, H.T. Wong, J.-W. Chen, H.B. Li, S.T.
Lin, C.-P. Liu, and Q. Yue (TEXONO Collaboration) | Coherency in Neutrino-Nucleus Elastic Scattering | 5 pages, 4 figures, 3 tables. V2 -- Published Version | Phys. Rev. D 93, 113006 (2016) | 10.1103/PhysRevD.93.113006 | NCTS-ECP/1503 | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Neutrino-nucleus elastic scattering provides a unique laboratory to study the
quantum mechanical coherency effects in electroweak interactions, towards which
several experimental programs are being actively pursued. We report results of
our quantitative studies on the transitions towards decoherency. A parameter
($\alpha$) is identified to describe the degree of coherency, and its
variations with incoming neutrino energy, detector threshold and target nucleus
are studied. The ranges of $\alpha$ which can be probed with realistic neutrino
experiments are derived, indicating complementarity between projects with
different sources and targets. Uncertainties in nuclear physics and in $\alpha$
would constrain sensitivities in probing physics beyond the standard model. The
maximum neutrino energies corresponding to $\alpha$>0.95 are derived.
| [
{
"created": "Tue, 29 Mar 2016 14:25:39 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Jun 2016 08:44:30 GMT",
"version": "v2"
}
] | 2016-06-10 | [
[
"Kerman",
"S.",
"",
"TEXONO Collaboration"
],
[
"Sharma",
"V.",
"",
"TEXONO Collaboration"
],
[
"Deniz",
"M.",
"",
"TEXONO Collaboration"
],
[
"Wong",
"H. T.",
"",
"TEXONO Collaboration"
],
[
"Chen",
"J. -W.",
"",
"TEXONO Collaboration"
],
[
"Li",
"H. B.",
"",
"TEXONO Collaboration"
],
[
"Lin",
"S. T.",
"",
"TEXONO Collaboration"
],
[
"Liu",
"C. -P.",
"",
"TEXONO Collaboration"
],
[
"Yue",
"Q.",
"",
"TEXONO Collaboration"
]
] | Neutrino-nucleus elastic scattering provides a unique laboratory to study the quantum mechanical coherency effects in electroweak interactions, towards which several experimental programs are being actively pursued. We report results of our quantitative studies on the transitions towards decoherency. A parameter ($\alpha$) is identified to describe the degree of coherency, and its variations with incoming neutrino energy, detector threshold and target nucleus are studied. The ranges of $\alpha$ which can be probed with realistic neutrino experiments are derived, indicating complementarity between projects with different sources and targets. Uncertainties in nuclear physics and in $\alpha$ would constrain sensitivities in probing physics beyond the standard model. The maximum neutrino energies corresponding to $\alpha$>0.95 are derived. |
hep-ph/0211278 | Egle Tomasi-Gustafsson | Michail P. Rekalo and Egle Tomasi-Gustafsson | Sensitivity of pQCD deuteron structure to the nucleon form factors | null | Eur.Phys.J. A16 (2003) 563-567 | null | null | hep-ph | null | We discuss the applicability of pQCD to the elastic scattering of electrons
on protons and deuterons. We analyze the $Q^2$-dependence of the reduced
deuteron form factor, taking into account the recent data on the electric
proton form factor and we find that the value of the QCD-scale parameter
$\Lambda$ differs essentially from the value $\Lambda=0.1$ GeV, previously
found using the dipole parametrization of the electromagnetic nucleon form
factors $G_E$ and $G_M$. Moreover the predicted scaling behavior of the reduced
deuteron form factor can not be recovered in the Dirac and Pauli
representations for the nucleon electromagnetic form factors.
| [
{
"created": "Mon, 18 Nov 2002 14:37:30 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Rekalo",
"Michail P.",
""
],
[
"Tomasi-Gustafsson",
"Egle",
""
]
] | We discuss the applicability of pQCD to the elastic scattering of electrons on protons and deuterons. We analyze the $Q^2$-dependence of the reduced deuteron form factor, taking into account the recent data on the electric proton form factor and we find that the value of the QCD-scale parameter $\Lambda$ differs essentially from the value $\Lambda=0.1$ GeV, previously found using the dipole parametrization of the electromagnetic nucleon form factors $G_E$ and $G_M$. Moreover the predicted scaling behavior of the reduced deuteron form factor can not be recovered in the Dirac and Pauli representations for the nucleon electromagnetic form factors. |
1206.4908 | Gudrun Heinrich | Sophia Borowka, Jonathon Carter, Gudrun Heinrich | SecDec: A tool for numerical multi-loop calculations | 9 pages, Based on a talk given at the 14th International Workshop on
Advanced Computing and Analysis Techniques in Physics Research (ACAT),
Uxbridge, London, UK, September 2011 | J. Phys.: Conf. Ser. 368, 012051 (2012) | 10.1088/1742-6596/368/1/012051 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The version 2.0 of the program SecDec is described, which can be used for the
extraction of poles within dimensional regularisation from multi-loop integrals
as well as phase space integrals. The numerical evaluation of the resulting
finite functions is also done by the program in an automated way, with no
restriction on the kinematics in the case of loop integrals.
| [
{
"created": "Thu, 21 Jun 2012 15:07:05 GMT",
"version": "v1"
}
] | 2012-06-25 | [
[
"Borowka",
"Sophia",
""
],
[
"Carter",
"Jonathon",
""
],
[
"Heinrich",
"Gudrun",
""
]
] | The version 2.0 of the program SecDec is described, which can be used for the extraction of poles within dimensional regularisation from multi-loop integrals as well as phase space integrals. The numerical evaluation of the resulting finite functions is also done by the program in an automated way, with no restriction on the kinematics in the case of loop integrals. |
1409.3502 | Zahra Tabrizi | Arman Esmaili, O. L. G. Peres, and Zahra Tabrizi | Probing Large Extra Dimensions With IceCube | v2: 25 pages, 4 figures, matches the published version at JCAP | JCAP 12 (2014) 002 | 10.1088/1475-7516/2014/12/002 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In models with Large Extra Dimensions the smallness of neutrino masses can be
naturally explained by introducing gauge singlet fermions which propagate in
the bulk. The Kaluza-Klein modes of these fermions appear as towers of sterile
neutrino states on the brane. We study the phenomenological consequences of
this picture for the high energy atmospheric neutrinos. For this purpose we
construct a detailed equivalence between a model with large extra dimensions
and a (3 + n) scenario consisting of three active and n extra sterile neutrino
states, which provides a clear intuitive understanding of Kaluza-Klein modes.
Finally, we analyze the collected data of high energy atmospheric neutrinos by
IceCube experiment and obtain bounds on the radius of extra dimensions.
| [
{
"created": "Thu, 11 Sep 2014 17:07:22 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Dec 2014 01:27:07 GMT",
"version": "v2"
}
] | 2014-12-03 | [
[
"Esmaili",
"Arman",
""
],
[
"Peres",
"O. L. G.",
""
],
[
"Tabrizi",
"Zahra",
""
]
] | In models with Large Extra Dimensions the smallness of neutrino masses can be naturally explained by introducing gauge singlet fermions which propagate in the bulk. The Kaluza-Klein modes of these fermions appear as towers of sterile neutrino states on the brane. We study the phenomenological consequences of this picture for the high energy atmospheric neutrinos. For this purpose we construct a detailed equivalence between a model with large extra dimensions and a (3 + n) scenario consisting of three active and n extra sterile neutrino states, which provides a clear intuitive understanding of Kaluza-Klein modes. Finally, we analyze the collected data of high energy atmospheric neutrinos by IceCube experiment and obtain bounds on the radius of extra dimensions. |
2206.09717 | Damir Becirevic | Damir Be\v{c}irevi\'c, Ilja Dor\v{s}ner, Svjetlana Fajfer, Darius A.
Faroughy, Florentin Jaffredo, Nejc Ko\v{s}nik and Olcyr Sumensari | On a model with two scalar leptoquarks -- $R_2$ and $S_3$ | 11pages, 5 figures | null | null | ZU-TH 24/22 | hep-ph hep-ex hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss a model that can accommodate the $B$-physics anomalies, based on
combining two scalar leptoquarks, $R_2$ and $S_3$, of mass
$\mathcal{O}(1\,\mathrm{TeV})$, and that we proposed in our previous paper. We
update the analysis of its parameter space and show that a model remains viable
and consistent with a number of low energy and high energy flavor physics
constraints. Since the model predicts a non-zero New Physics phase, we discuss
the possibility to test its contribution to the neutron electric dipole moment
and to the angular distributions of the exclusive $b\to c\tau \bar \nu$ decays.
We find that the model can provide a significant enhancement to
$\mathcal{B}(B\to K^{(\ast)}\nu\nu)$ and provides both the upper and lower
bounds to $\mathcal{B}(B\to K^{(\ast)}\mu\tau)$.
| [
{
"created": "Mon, 20 Jun 2022 11:25:07 GMT",
"version": "v1"
}
] | 2022-06-22 | [
[
"Bečirević",
"Damir",
""
],
[
"Doršner",
"Ilja",
""
],
[
"Fajfer",
"Svjetlana",
""
],
[
"Faroughy",
"Darius A.",
""
],
[
"Jaffredo",
"Florentin",
""
],
[
"Košnik",
"Nejc",
""
],
[
"Sumensari",
"Olcyr",
""
]
] | We discuss a model that can accommodate the $B$-physics anomalies, based on combining two scalar leptoquarks, $R_2$ and $S_3$, of mass $\mathcal{O}(1\,\mathrm{TeV})$, and that we proposed in our previous paper. We update the analysis of its parameter space and show that a model remains viable and consistent with a number of low energy and high energy flavor physics constraints. Since the model predicts a non-zero New Physics phase, we discuss the possibility to test its contribution to the neutron electric dipole moment and to the angular distributions of the exclusive $b\to c\tau \bar \nu$ decays. We find that the model can provide a significant enhancement to $\mathcal{B}(B\to K^{(\ast)}\nu\nu)$ and provides both the upper and lower bounds to $\mathcal{B}(B\to K^{(\ast)}\mu\tau)$. |
hep-ph/0004043 | Konstantin Matchev | Jonathan L. Feng (IAS, Princeton), Konstantin T. Matchev (Fermilab)
and Frank Wilczek (IAS, Princeton) | Neutralino Dark Matter in Focus Point Supersymmetry | 15 pages, 6 figures, version to appear in Phys. Lett. B. References
added, minor modifications of Figs. 2 and 4 due to a bug (sign error) in
neutdriver | Phys.Lett.B482:388-399,2000 | 10.1016/S0370-2693(00)00512-8 | IASSNS-HEP-00-24, FERMILAB-PUB-00/074-T | hep-ph astro-ph hep-ex | null | In recent work, it has been argued that multi-TeV masses for scalar
superpartners are not unnatural. Indeed, they appear to have significant
phenomenological virtues. Here we explore the implications of such `focus
point' supersymmetry for the dark matter problem. We find that constraints on
relic densities do not place upper bounds on neutralino or scalar masses. We
demonstrate that, in the specific context of minimal supergravity, a
cosmologically stable mixed gaugino-Higgsino state emerges as an excellent,
robust dark matter candidate. We estimate that, over a wide range of the
unknown parameters, the spin-independent proton-neutralino cross sections fall
in the range accessible to planned search experiments.
| [
{
"created": "Thu, 6 Apr 2000 15:29:50 GMT",
"version": "v1"
},
{
"created": "Wed, 3 May 2000 22:33:22 GMT",
"version": "v2"
}
] | 2009-09-25 | [
[
"Feng",
"Jonathan L.",
"",
"IAS, Princeton"
],
[
"Matchev",
"Konstantin T.",
"",
"Fermilab"
],
[
"Wilczek",
"Frank",
"",
"IAS, Princeton"
]
] | In recent work, it has been argued that multi-TeV masses for scalar superpartners are not unnatural. Indeed, they appear to have significant phenomenological virtues. Here we explore the implications of such `focus point' supersymmetry for the dark matter problem. We find that constraints on relic densities do not place upper bounds on neutralino or scalar masses. We demonstrate that, in the specific context of minimal supergravity, a cosmologically stable mixed gaugino-Higgsino state emerges as an excellent, robust dark matter candidate. We estimate that, over a wide range of the unknown parameters, the spin-independent proton-neutralino cross sections fall in the range accessible to planned search experiments. |
hep-ph/0201131 | Bogdan A. Dobrescu | Thomas Appelquist, Bogdan A. Dobrescu, Eduardo Ponton, Ho-Ung Yee
(Yale University) | Neutrinos Vis-a-vis the Six-Dimensional Standard Model | 34 pages, Latex, 2 eps figures. Change in the normalization
convention for the warp factor; other minor changes | Phys.Rev. D65 (2002) 105019 | 10.1103/PhysRevD.65.105019 | YCTP-P1-02 | hep-ph hep-th | null | We examine the origin of neutrino masses and oscillations in the context of
the six-dimensional standard model. The space-time symmetries of this model
explain proton stability and forbid Majorana neutrino masses. The consistency
of the six-dimensional theory requires three right-handed neutrinos, and
therefore Dirac neutrino masses are allowed. We employ the idea that the
smallness of these masses is due to the propagation of the right-handed
neutrinos in a seventh, warped dimension. We argue that this class of theories
is free of gravitational anomalies. Although an exponential hierarchy arises
between the neutrino masses and the electroweak scale, we find that the mass
hierarchy among the three neutrino masses is limited by higher-dimension
operators. All current neutrino oscillation data, except for the LSND result,
are naturally accommodated by our model. In the case of the solar neutrinos,
the model leads to the large mixing angle, MSW solution. The mechanism
employed, involving three right-handed neutrinos coupled to a scalar in an
extra dimension, may explain the features of the neutrino spectrum in a more
general class of theories that forbid Majorana masses.
| [
{
"created": "Tue, 15 Jan 2002 20:17:38 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Mar 2002 22:56:37 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Appelquist",
"Thomas",
"",
"Yale University"
],
[
"Dobrescu",
"Bogdan A.",
"",
"Yale University"
],
[
"Ponton",
"Eduardo",
"",
"Yale University"
],
[
"Yee",
"Ho-Ung",
"",
"Yale University"
]
] | We examine the origin of neutrino masses and oscillations in the context of the six-dimensional standard model. The space-time symmetries of this model explain proton stability and forbid Majorana neutrino masses. The consistency of the six-dimensional theory requires three right-handed neutrinos, and therefore Dirac neutrino masses are allowed. We employ the idea that the smallness of these masses is due to the propagation of the right-handed neutrinos in a seventh, warped dimension. We argue that this class of theories is free of gravitational anomalies. Although an exponential hierarchy arises between the neutrino masses and the electroweak scale, we find that the mass hierarchy among the three neutrino masses is limited by higher-dimension operators. All current neutrino oscillation data, except for the LSND result, are naturally accommodated by our model. In the case of the solar neutrinos, the model leads to the large mixing angle, MSW solution. The mechanism employed, involving three right-handed neutrinos coupled to a scalar in an extra dimension, may explain the features of the neutrino spectrum in a more general class of theories that forbid Majorana masses. |
hep-ph/0310281 | Roelof Bijker | R. Bijker, M.M. Giannini and E. Santopinto | Spectroscopy of pentaquark states | 26 pages, 4 figures, 11 tables, revised version with 2 extra tables,
an updated list of references and expanded discussion of the results.
Accepted for publication in Eur. Phys. J. A | Eur.Phys.J. A22 (2004) 319-329 | 10.1140/epja/i2003-10232-x | null | hep-ph nucl-th | null | We construct a complete classification of pentaquark states in terms of the
spin-flavour SU(6) representations. We find that only some definite SU(3)
representations are allowed, singlets, octets, decuplets, anti-decuplets,
27-plets and 35-plets. The latter three contain exotic states, which cannot be
constructed from three quarks only. This complete classification scheme is
general and model independent and is useful both for model builders and
experimentalists. The mass spectrum is obtained from a Gursey-Radicati type
mass formula, whose coefficients have been determined previously by a study of
qqq baryons. The ground state pentaquark which is identified with the recently
observed Theta(1540) state, is predicted to be an isosinglet anti-decuplet
state. Its parity depends on the interplay between the spin-flavour and orbital
contributions to the mass operator.
| [
{
"created": "Thu, 23 Oct 2003 21:55:14 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Nov 2003 18:00:02 GMT",
"version": "v2"
},
{
"created": "Tue, 18 May 2004 17:23:37 GMT",
"version": "v3"
}
] | 2009-11-10 | [
[
"Bijker",
"R.",
""
],
[
"Giannini",
"M. M.",
""
],
[
"Santopinto",
"E.",
""
]
] | We construct a complete classification of pentaquark states in terms of the spin-flavour SU(6) representations. We find that only some definite SU(3) representations are allowed, singlets, octets, decuplets, anti-decuplets, 27-plets and 35-plets. The latter three contain exotic states, which cannot be constructed from three quarks only. This complete classification scheme is general and model independent and is useful both for model builders and experimentalists. The mass spectrum is obtained from a Gursey-Radicati type mass formula, whose coefficients have been determined previously by a study of qqq baryons. The ground state pentaquark which is identified with the recently observed Theta(1540) state, is predicted to be an isosinglet anti-decuplet state. Its parity depends on the interplay between the spin-flavour and orbital contributions to the mass operator. |
1106.3942 | Axel Maas | Axel Maas | Gauge bosons at zero and finite temperature | v2: 153 pages, 45 figures, revised, updated, and extended version
submitted on invitation to Physics Reports; v3: Intermediate update, 152
pages, 45 figures, minor errors corrected, reference list extended; v3 minor
typographical changes and corrections, added references, version to appear in
Physics Reports | Physics Reports 524 (2013), pp. 203-300 | 10.1016/j.physrep.2012.11.002 | null | hep-ph hep-lat hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gauge theories of the Yang-Mills type are the single most important building
block of the standard model and beyond. Since Yang-Mills theories are gauge
theories their elementary particles, the gauge bosons, cannot be described
without fixing a gauge. Beyond perturbation theory, gauge-fixing in non-Abelian
gauge theories is obstructed by the Gribov-Singer ambiguity. The construction
and implementation of a method-independent gauge-fixing prescription to resolve
this ambiguity is the most important step to describe gauge bosons beyond
perturbation theory. Proposals for such a procedure, generalizing the
perturbative Landau gauge, are described here. Their implementation are
discussed for two example methods, lattice gauge theory and the quantum
equations of motion. The most direct access to the properties of the gauge
bosons is provided by their correlation functions. The corresponding two- and
three-point correlation functions are presented at all energy scales. These
give access to the properties of the gauge bosons, like their absence from the
asymptotic physical state space, the absence of an on-shell mass pole,
particle-like properties at high energies, and their running couplings.
Furthermore, auxiliary degrees of freedom are introduced during gauge-fixing,
and their properties are discussed as well. These results are presented for
two, three, and four dimensions, and for various gauge algebras. Finally, the
modifications of the properties of gauge bosons at finite temperature are
presented. Evidence is provided that these reflect the phase structure of
Yang-Mills theory. However, it is found that the phase transition is not
deconfining the gauge bosons, although the bulk thermodynamical behavior is of
a Stefan-Boltzmann type. The resolution of this apparent contradiction is also
presented. This resolution also provides an explicit and constructive solution
to the Linde problem.
| [
{
"created": "Mon, 20 Jun 2011 15:27:07 GMT",
"version": "v1"
},
{
"created": "Fri, 23 Dec 2011 13:39:34 GMT",
"version": "v2"
},
{
"created": "Mon, 30 Jul 2012 14:21:41 GMT",
"version": "v3"
},
{
"created": "Mon, 3 Dec 2012 17:02:26 GMT",
"version": "v4"
}
] | 2013-03-12 | [
[
"Maas",
"Axel",
""
]
] | Gauge theories of the Yang-Mills type are the single most important building block of the standard model and beyond. Since Yang-Mills theories are gauge theories their elementary particles, the gauge bosons, cannot be described without fixing a gauge. Beyond perturbation theory, gauge-fixing in non-Abelian gauge theories is obstructed by the Gribov-Singer ambiguity. The construction and implementation of a method-independent gauge-fixing prescription to resolve this ambiguity is the most important step to describe gauge bosons beyond perturbation theory. Proposals for such a procedure, generalizing the perturbative Landau gauge, are described here. Their implementation are discussed for two example methods, lattice gauge theory and the quantum equations of motion. The most direct access to the properties of the gauge bosons is provided by their correlation functions. The corresponding two- and three-point correlation functions are presented at all energy scales. These give access to the properties of the gauge bosons, like their absence from the asymptotic physical state space, the absence of an on-shell mass pole, particle-like properties at high energies, and their running couplings. Furthermore, auxiliary degrees of freedom are introduced during gauge-fixing, and their properties are discussed as well. These results are presented for two, three, and four dimensions, and for various gauge algebras. Finally, the modifications of the properties of gauge bosons at finite temperature are presented. Evidence is provided that these reflect the phase structure of Yang-Mills theory. However, it is found that the phase transition is not deconfining the gauge bosons, although the bulk thermodynamical behavior is of a Stefan-Boltzmann type. The resolution of this apparent contradiction is also presented. This resolution also provides an explicit and constructive solution to the Linde problem. |
hep-ph/0003284 | Vicente Pleitez | J. C. Montero, C. A. de S. Pires and V. Pleitez | Neutrinoless double beta decay with and without Majoron-like boson
emission in a 3-3-1 model | Revtex, 10 pages and 8 eps figures. Extended version to be published
in Physical Review D | Phys.Rev. D64 (2001) 096001 | 10.1103/PhysRevD.64.096001 | IFT-P.033/2000 | hep-ph | null | We consider the contributions to the neutrinoless double beta decays in a
$SU(3)_L\otimes U(1)_N$ electroweak model. We show that for a range of the
parameters in the model there are diagrams involving vector-vector-scalar and
trilinear scalar couplings which can be potentially as contributing as the
light massive Majorana neutrino exchange one. We use these contributions to
obtain constraints upon some mass scales of the model, like the masses of the
new charged vector and scalar bosons. We also consider briefly the decay in
which besides the two electrons a Majoron-like boson is emitted.
| [
{
"created": "Wed, 29 Mar 2000 14:06:47 GMT",
"version": "v1"
},
{
"created": "Fri, 15 Dec 2000 18:12:13 GMT",
"version": "v2"
},
{
"created": "Fri, 29 Jun 2001 16:58:54 GMT",
"version": "v3"
}
] | 2009-10-31 | [
[
"Montero",
"J. C.",
""
],
[
"Pires",
"C. A. de S.",
""
],
[
"Pleitez",
"V.",
""
]
] | We consider the contributions to the neutrinoless double beta decays in a $SU(3)_L\otimes U(1)_N$ electroweak model. We show that for a range of the parameters in the model there are diagrams involving vector-vector-scalar and trilinear scalar couplings which can be potentially as contributing as the light massive Majorana neutrino exchange one. We use these contributions to obtain constraints upon some mass scales of the model, like the masses of the new charged vector and scalar bosons. We also consider briefly the decay in which besides the two electrons a Majoron-like boson is emitted. |
2406.14602 | Qinrui Liu | Qinrui Liu, Ningqiang Song, Aaron C. Vincent | Constraints on Heavy Asymmetric and Symmetric Dark Matter from the
Glashow Resonance | 10 pages, 3 figures | null | null | null | hep-ph astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The decay of asymmetric dark matter (ADM) can lead to distinct neutrino
signatures characterized by an asymmetry between neutrinos and antineutrinos.
In the high-energy regime, the Glashow resonant interaction $\bar{\nu}_{e} +
e^{-} \rightarrow W^{-}$ yields an increase in sensitivity to the neutrino
flux, and stands out as the only way of discerning the antineutrino component
in the diffuse high-energy astrophysical neutrino flux. This offers a unique
opportunity in the search for dark matter with masses above the PeV scale. We
examine the neutrino signal stemming from ADM decay and set the first stringent
constraints on ADM lifetime $\tau_X$. For ADM with mass $m_X\gtrsim 10$ PeV, we
find $\tau_X\lesssim 10^{29}$s using the data from the recent IceCube search
for Glashow resonance events. Our projections further show that sensitivities
at the forthcoming IceCube-Gen2 could approach $10^{30}$s, depending on the
decay channel. The current constraints on symmetric dark matter decay to
neutrinos are also improved by up to a factor of 3 thanks to the Glashow
resonance.
| [
{
"created": "Thu, 20 Jun 2024 18:00:00 GMT",
"version": "v1"
}
] | 2024-06-24 | [
[
"Liu",
"Qinrui",
""
],
[
"Song",
"Ningqiang",
""
],
[
"Vincent",
"Aaron C.",
""
]
] | The decay of asymmetric dark matter (ADM) can lead to distinct neutrino signatures characterized by an asymmetry between neutrinos and antineutrinos. In the high-energy regime, the Glashow resonant interaction $\bar{\nu}_{e} + e^{-} \rightarrow W^{-}$ yields an increase in sensitivity to the neutrino flux, and stands out as the only way of discerning the antineutrino component in the diffuse high-energy astrophysical neutrino flux. This offers a unique opportunity in the search for dark matter with masses above the PeV scale. We examine the neutrino signal stemming from ADM decay and set the first stringent constraints on ADM lifetime $\tau_X$. For ADM with mass $m_X\gtrsim 10$ PeV, we find $\tau_X\lesssim 10^{29}$s using the data from the recent IceCube search for Glashow resonance events. Our projections further show that sensitivities at the forthcoming IceCube-Gen2 could approach $10^{30}$s, depending on the decay channel. The current constraints on symmetric dark matter decay to neutrinos are also improved by up to a factor of 3 thanks to the Glashow resonance. |
hep-ph/0005115 | Herbert Weigel | H. Weigel | Hyperon Beta-Decay and Axial Charges of the Lambda in view of Strongly
Distorted Baryon Wave-Functions | 14 pages, minor revisions, paper accepted for publication in Nucl.
Phys. A | Nucl.Phys. A690 (2001) 595 | 10.1016/S0375-9474(01)00347-5 | MIT-CTP-2982 | hep-ph nucl-th | null | Within the collective coordinate approach to chiral soliton models we suggest
that breaking of SU(3) flavor symmetry mainly resides in the baryon
wave-functions while the charge operators maintain a symmetric structure.
Sizable symmetry breaking in the wave-functions is required to reproduce the
observed spacing in the spectrum of the (1/2)^+ baryons. The matrix elements of
the flavor symmetric charge operators nevertheless yield g_A/g_V ratios for
hyperon beta-decay which agree with the empirical data approximately as well as
the successful F&D parameterization of the Cabibbo scheme. Demanding the
strangeness component in the nucleon to vanish in the two flavor limit of the
model, determines the structure of the singlet axial charge operator and yields
the various quark flavor components of the axial charge of the \Lambda-hyperon.
The suggested picture gains support from calculations in a realistic model
using pion and vector meson degrees of freedom to build up the soliton.
| [
{
"created": "Thu, 11 May 2000 22:20:42 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Dec 2000 08:03:52 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Weigel",
"H.",
""
]
] | Within the collective coordinate approach to chiral soliton models we suggest that breaking of SU(3) flavor symmetry mainly resides in the baryon wave-functions while the charge operators maintain a symmetric structure. Sizable symmetry breaking in the wave-functions is required to reproduce the observed spacing in the spectrum of the (1/2)^+ baryons. The matrix elements of the flavor symmetric charge operators nevertheless yield g_A/g_V ratios for hyperon beta-decay which agree with the empirical data approximately as well as the successful F&D parameterization of the Cabibbo scheme. Demanding the strangeness component in the nucleon to vanish in the two flavor limit of the model, determines the structure of the singlet axial charge operator and yields the various quark flavor components of the axial charge of the \Lambda-hyperon. The suggested picture gains support from calculations in a realistic model using pion and vector meson degrees of freedom to build up the soliton. |
2010.04727 | Arushi Bodas | Arushi Bodas, Soubhik Kumar, Raman Sundrum | The Scalar Chemical Potential in Cosmological Collider Physics | 38 pages, 6 figures, v2: text added for clarification, figs. 2 and 3
changed to better represent the conclusions of our analysis, matches
publication in JHEP | JHEP 2021, 79 (2021) | 10.1007/JHEP02(2021)079 | UMD-PP-020-09 | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Non-analyticity in co-moving momenta within the non-Gaussian bispectrum is a
distinctive sign of on-shell particle production during inflation, presenting a
unique opportunity for the "direct detection" of particles with masses as large
as the inflationary Hubble scale ($H$). However, the strength of such
non-analyticity ordinarily drops exponentially by a Boltzmann-like factor as
masses exceed $H$. In this paper, we study an exception provided by a
dimension-5 derivative coupling of the inflaton to heavy-particle currents,
applying it specifically to the case of two real scalars. The operator has a
"chemical potential" form, which harnesses the large kinetic energy scale of
the inflaton, $\dot{\phi}_{0}^{1/2} \approx 60H$, to act as an efficient source
of scalar particle production. Derivative couplings of inflaton ensure
radiative stability of the slow-roll potential, which in turn maintains
(approximate) scale-invariance of the inflationary correlations. We show that a
signal not suffering Boltzmann suppression can be obtained in the bispectrum
with strength $f_{\mathrm{NL}} \sim \mathcal{O}(0.01-10)$ for an extended range
of scalar masses, $M \lesssim \dot{\phi}_{0}^{1/2}$, potentially as high as
$10^{15}$ GeV, within the sensitivity of upcoming LSS and more futuristic 21-cm
experiments. The mechanism does not invoke any particular fine-tuning of
parameters or breakdown of perturbation-theoretic control. The leading
contribution appears at tree-level, which makes the calculation analytically
tractable and removes the loop-suppression as compared to earlier chemical
potential studies of non-zero spins. The steady particle production allows us
to infer the effective mass of the heavy particles and the chemical potential
from the variation in bispectrum oscillations as a function of co-moving
momenta. Our analysis sets the stage for generalization to heavy bosons with
non-zero spin.
| [
{
"created": "Fri, 9 Oct 2020 18:00:01 GMT",
"version": "v1"
},
{
"created": "Sat, 20 Feb 2021 00:04:12 GMT",
"version": "v2"
}
] | 2021-02-23 | [
[
"Bodas",
"Arushi",
""
],
[
"Kumar",
"Soubhik",
""
],
[
"Sundrum",
"Raman",
""
]
] | Non-analyticity in co-moving momenta within the non-Gaussian bispectrum is a distinctive sign of on-shell particle production during inflation, presenting a unique opportunity for the "direct detection" of particles with masses as large as the inflationary Hubble scale ($H$). However, the strength of such non-analyticity ordinarily drops exponentially by a Boltzmann-like factor as masses exceed $H$. In this paper, we study an exception provided by a dimension-5 derivative coupling of the inflaton to heavy-particle currents, applying it specifically to the case of two real scalars. The operator has a "chemical potential" form, which harnesses the large kinetic energy scale of the inflaton, $\dot{\phi}_{0}^{1/2} \approx 60H$, to act as an efficient source of scalar particle production. Derivative couplings of inflaton ensure radiative stability of the slow-roll potential, which in turn maintains (approximate) scale-invariance of the inflationary correlations. We show that a signal not suffering Boltzmann suppression can be obtained in the bispectrum with strength $f_{\mathrm{NL}} \sim \mathcal{O}(0.01-10)$ for an extended range of scalar masses, $M \lesssim \dot{\phi}_{0}^{1/2}$, potentially as high as $10^{15}$ GeV, within the sensitivity of upcoming LSS and more futuristic 21-cm experiments. The mechanism does not invoke any particular fine-tuning of parameters or breakdown of perturbation-theoretic control. The leading contribution appears at tree-level, which makes the calculation analytically tractable and removes the loop-suppression as compared to earlier chemical potential studies of non-zero spins. The steady particle production allows us to infer the effective mass of the heavy particles and the chemical potential from the variation in bispectrum oscillations as a function of co-moving momenta. Our analysis sets the stage for generalization to heavy bosons with non-zero spin. |
1505.06469 | Phung Van Dong | P. V. Dong | Unifying the electroweak and B-L interactions | 25 pages, 2 figures; matches published version in PRD | Phys. Rev. D 92, 055026 (2015) | 10.1103/PhysRevD.92.055026 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We argue that the gauge symmetry which includes SU(3)_L as a higher
weak-isospin symmetry is manifestly given by SU(3)_C\otimes SU(3)_L\otimes
U(1)_X\otimes U(1)_N, where the last two factors determine the electric charge
and B-L, respectively. This theory not only provides a consistent unification
of the electroweak and B-L interactions, but also gives insights in dark
matter, neutrino masses, and inflation. The dark matter belongs to a class of
new particles that have wrong B-L numbers, and is stabilized due to a
newly-realized W-parity as residual gauge symmetry. The B-L breaking field is
important to define the W-parity, seesaw scales, and inflaton. Furthermore, the
number of fermion generations and the electric charge quantization are
explained naturally. We also show that the previous 3-3-1 models are only an
effective theory as the B-L charge and the unitarity argument are violated.
This work substantially generalizes our recently-proposed 3-3-1-1 model.
| [
{
"created": "Sun, 24 May 2015 19:46:17 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Sep 2015 17:09:56 GMT",
"version": "v2"
}
] | 2015-09-22 | [
[
"Dong",
"P. V.",
""
]
] | We argue that the gauge symmetry which includes SU(3)_L as a higher weak-isospin symmetry is manifestly given by SU(3)_C\otimes SU(3)_L\otimes U(1)_X\otimes U(1)_N, where the last two factors determine the electric charge and B-L, respectively. This theory not only provides a consistent unification of the electroweak and B-L interactions, but also gives insights in dark matter, neutrino masses, and inflation. The dark matter belongs to a class of new particles that have wrong B-L numbers, and is stabilized due to a newly-realized W-parity as residual gauge symmetry. The B-L breaking field is important to define the W-parity, seesaw scales, and inflaton. Furthermore, the number of fermion generations and the electric charge quantization are explained naturally. We also show that the previous 3-3-1 models are only an effective theory as the B-L charge and the unitarity argument are violated. This work substantially generalizes our recently-proposed 3-3-1-1 model. |
hep-ph/0402097 | Tim Gershon | Tim Gershon and Masashi Hazumi | Time-Dependent CP Violation in $B^0 \to P^0P^0X^0$ Decays | 13 pages, 3 figures To appear in Physics Letters B | Phys.Lett. B596 (2004) 163-172 | 10.1016/j.physletb.2004.06.095 | null | hep-ph hep-ex | null | We note that in decays of the type $B^0 \to P^0P^0X^0$, where $P^0$ and $X^0$
represent any CP eigenstate spin-0 neutral particles, the final state is a CP
eigenstate. We consider the possibilities for studying time-dependent CP
violation in decays of this type at $B$ factories with high luminosity, with
particular attention to $B^0 \to \ks \ks \ks$. We also comment on some cases
where $X^0$ has non-zero spin, and decays of the type $B^0 \to P^0 Q^0 X^0$,
where the three final state particles are different spin-0 CP eigenstates.
| [
{
"created": "Tue, 10 Feb 2004 01:41:57 GMT",
"version": "v1"
},
{
"created": "Thu, 6 May 2004 04:33:49 GMT",
"version": "v2"
},
{
"created": "Wed, 30 Jun 2004 05:18:46 GMT",
"version": "v3"
}
] | 2009-11-10 | [
[
"Gershon",
"Tim",
""
],
[
"Hazumi",
"Masashi",
""
]
] | We note that in decays of the type $B^0 \to P^0P^0X^0$, where $P^0$ and $X^0$ represent any CP eigenstate spin-0 neutral particles, the final state is a CP eigenstate. We consider the possibilities for studying time-dependent CP violation in decays of this type at $B$ factories with high luminosity, with particular attention to $B^0 \to \ks \ks \ks$. We also comment on some cases where $X^0$ has non-zero spin, and decays of the type $B^0 \to P^0 Q^0 X^0$, where the three final state particles are different spin-0 CP eigenstates. |
1209.2490 | M.I. Vyazovsky | M. A. Braun, M. Yu. Salykin, S. S. Pozdnyakov and M. I. Vyazovsky
(Saint-Petersburg State University, Russia) | Production of a gluon with the exchange of three reggeized gluons in the
Lipatov effective action approach | 22 pages, 9 figures; submitted to Eur.Phys.Jour. C | null | 10.1140/epjc/s10052-012-2223-7 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the Regge kinematics the amplitude for gluon production off three
scattering centers is found in the Lipatov effective action technique. The
vertex for gluon emission with the reggeon splitting in three reggeons is
calculated and its transversality is demonstrated. It is shown that in the sum
of all contributions terms containing principal value singularities are
cancelled and substituted by the standard Feynman poles. These results may be
used for calculation of the inclusive cross-section for gluon production on two
nucleons in the nucleus.
| [
{
"created": "Wed, 12 Sep 2012 04:12:16 GMT",
"version": "v1"
}
] | 2015-06-11 | [
[
"Braun",
"M. A.",
"",
"Saint-Petersburg State University, Russia"
],
[
"Salykin",
"M. Yu.",
"",
"Saint-Petersburg State University, Russia"
],
[
"Pozdnyakov",
"S. S.",
"",
"Saint-Petersburg State University, Russia"
],
[
"Vyazovsky",
"M. I.",
"",
"Saint-Petersburg State University, Russia"
]
] | In the Regge kinematics the amplitude for gluon production off three scattering centers is found in the Lipatov effective action technique. The vertex for gluon emission with the reggeon splitting in three reggeons is calculated and its transversality is demonstrated. It is shown that in the sum of all contributions terms containing principal value singularities are cancelled and substituted by the standard Feynman poles. These results may be used for calculation of the inclusive cross-section for gluon production on two nucleons in the nucleus. |
hep-ph/0009266 | Robert Buras | R. Buras (MPP Munich), D.V. Semikoz (MPP Munich) | Maximum lepton asymmetry from active-sterile neutrino oscillations in
the Early Universe | 14 pp, 4 figures | Phys.Rev. D64 (2001) 017302 | 10.1103/PhysRevD.64.017302 | null | hep-ph | null | A large lepton asymmetry could be generated in the Early Universe by
oscillations of active to sterile neutrinos with a small mixing angle sin 2
\theta < 10^-2. The final order of magnitude of the lepton asymmetry \eta is
mainly determined by its growth in the last stage of evolution when the MSW
resonance dominates the kinetic equations. In this paper we present a simple
way of calculating the maximum possible lepton asymmetry which can be created.
Our results are in good agreement to previous calculations. Furthermore, we
find that the growth of asymmetry does not obey any particular power law. We
find that the maximum possible asymmetry at the freeze-out of the n/p ratio at
T \sim 1 MeV strongly depends on the mass-squared difference \delta m^2: the
asymmetry is negligible for \delta m^2 \ll 1 eV^2 and reaches asymptotically
large values for \delta m^2 \ge 50 eV^2.
| [
{
"created": "Fri, 22 Sep 2000 12:50:49 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Buras",
"R.",
"",
"MPP Munich"
],
[
"Semikoz",
"D. V.",
"",
"MPP Munich"
]
] | A large lepton asymmetry could be generated in the Early Universe by oscillations of active to sterile neutrinos with a small mixing angle sin 2 \theta < 10^-2. The final order of magnitude of the lepton asymmetry \eta is mainly determined by its growth in the last stage of evolution when the MSW resonance dominates the kinetic equations. In this paper we present a simple way of calculating the maximum possible lepton asymmetry which can be created. Our results are in good agreement to previous calculations. Furthermore, we find that the growth of asymmetry does not obey any particular power law. We find that the maximum possible asymmetry at the freeze-out of the n/p ratio at T \sim 1 MeV strongly depends on the mass-squared difference \delta m^2: the asymmetry is negligible for \delta m^2 \ll 1 eV^2 and reaches asymptotically large values for \delta m^2 \ge 50 eV^2. |
1605.05116 | Shaikh Saad | K.S. Babu, Borut Bajc, Shaikh Saad | New Class of SO(10) Models for Flavor | 40 pages, Latex, 1 figure | Phys. Rev. D 94, 015030 (2016) | 10.1103/PhysRevD.94.015030 | OSU-HEP-16-02 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a new class of unified models based on SO(10) symmetry which
provides insights into the masses and mixings of quarks and leptons, including
the neutrinos. The key feature of our proposal is the absence of Higgs boson
10_H belonging to the fundamental representation that is normally employed.
Flavor mixing is induced via vector-like fermions in the 16 + 16-bar
representation. A variety of scenarios, both supersymmetric and otherwise, are
analyzed involving a 126_H along with either a 45_H or a 210_H of Higgs boson
employed for symmetry breaking. It is shown that this framework, with only a
limited number of parameters, provides an excellent fit to the full fermion
spectrum, utilizing either type-I or type-II seesaw mechanism. These flavor
models can be potentially tested and distinguished in their predictions for
proton decay branching ratios, which are analyzed.
| [
{
"created": "Tue, 17 May 2016 11:19:52 GMT",
"version": "v1"
}
] | 2016-08-03 | [
[
"Babu",
"K. S.",
""
],
[
"Bajc",
"Borut",
""
],
[
"Saad",
"Shaikh",
""
]
] | We present a new class of unified models based on SO(10) symmetry which provides insights into the masses and mixings of quarks and leptons, including the neutrinos. The key feature of our proposal is the absence of Higgs boson 10_H belonging to the fundamental representation that is normally employed. Flavor mixing is induced via vector-like fermions in the 16 + 16-bar representation. A variety of scenarios, both supersymmetric and otherwise, are analyzed involving a 126_H along with either a 45_H or a 210_H of Higgs boson employed for symmetry breaking. It is shown that this framework, with only a limited number of parameters, provides an excellent fit to the full fermion spectrum, utilizing either type-I or type-II seesaw mechanism. These flavor models can be potentially tested and distinguished in their predictions for proton decay branching ratios, which are analyzed. |
hep-ph/9705424 | GLin | Guey-Lin Lin | Like Sign Top Pair Production at LHC | 9 pages, use sprocl.sty and psfig.tex; invited talk presented at the
Third International Workshop on Particle Physics Phenomenology, Chinsan,
Taipei, Taiwan, Nov. 14-17, 1996; to appear in the proceedings | null | null | NCTU-TH-97-02 | hep-ph | null | Having a mass comparable to the weak scale, the top quark may have a sizable
flavor changing couplings to Higgs bosons. We show that such couplings can be
probed at the LHC through the parton subprocess $c(\bar c)g \to t (\bar t)A^0$,
where the pseudoscalar $A^0$ subsequently decays into $t \bar c$ or ${\bar t}
c$, giving rise to the intriguing final state of like sign top quark pairs. We
also discuss major backgrounds to the above signal, in particular the QCD-Weak
process $q\bar q' \to W^+(W^-) t \bar t$. The issue of background reduction is
briefly discussed.
| [
{
"created": "Mon, 26 May 1997 10:19:55 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Lin",
"Guey-Lin",
""
]
] | Having a mass comparable to the weak scale, the top quark may have a sizable flavor changing couplings to Higgs bosons. We show that such couplings can be probed at the LHC through the parton subprocess $c(\bar c)g \to t (\bar t)A^0$, where the pseudoscalar $A^0$ subsequently decays into $t \bar c$ or ${\bar t} c$, giving rise to the intriguing final state of like sign top quark pairs. We also discuss major backgrounds to the above signal, in particular the QCD-Weak process $q\bar q' \to W^+(W^-) t \bar t$. The issue of background reduction is briefly discussed. |
1207.3844 | Ian Balitsky | Ian Balitsky and Giovanni A. Chirilli | Photon impact factor and $k_T$-factorization for DIS in the
next-to-leading order | 13 pages, 4 figures, typos corrected. arXiv admin note: substantial
text overlap with arXiv:1009.4729 | null | 10.1103/PhysRevD.87.014013 | JLAB-THY-12-1596; NT-LBL-12-014 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The photon impact factor for the BFKL pomeron is calculated in the
next-to-leading order (NLO) approximation using the operator expansion in
Wilson lines. The result is represented as a NLO $k_T$-factorization formula
for the structure functions of small-$x$ deep inelastic scattering.
| [
{
"created": "Mon, 16 Jul 2012 23:18:21 GMT",
"version": "v1"
},
{
"created": "Sun, 27 Jul 2014 16:56:05 GMT",
"version": "v2"
}
] | 2014-07-29 | [
[
"Balitsky",
"Ian",
""
],
[
"Chirilli",
"Giovanni A.",
""
]
] | The photon impact factor for the BFKL pomeron is calculated in the next-to-leading order (NLO) approximation using the operator expansion in Wilson lines. The result is represented as a NLO $k_T$-factorization formula for the structure functions of small-$x$ deep inelastic scattering. |
hep-ph/0012170 | Altug Ozpineci | T. M. Aliev, A. Ozpineci, M. Savci | Meson-Baryon Couplings and the F/D ratio in Light Cone QCD | 22 pages, 5 figures, LaTeX formatted | Phys.Rev. D64 (2001) 034001 | 10.1103/PhysRevD.64.034001 | metu-phys-hep-00-21 | hep-ph | null | Using the general form of the baryon currents, we calculate the meson-baryon
coupling constants and the F/D ratio within the framework of light cone QCD sum
rules in the SU(3) flavor symmetry limit. The dependence of the results on the
Dirac structure and on the free parameter (b) appearing in the general baryon
current is considered. Comparison of our results on F/D ratio with the existing
results is presented.
| [
{
"created": "Thu, 14 Dec 2000 12:46:17 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Mar 2001 19:48:30 GMT",
"version": "v2"
},
{
"created": "Mon, 10 Mar 2003 11:44:28 GMT",
"version": "v3"
}
] | 2009-10-31 | [
[
"Aliev",
"T. M.",
""
],
[
"Ozpineci",
"A.",
""
],
[
"Savci",
"M.",
""
]
] | Using the general form of the baryon currents, we calculate the meson-baryon coupling constants and the F/D ratio within the framework of light cone QCD sum rules in the SU(3) flavor symmetry limit. The dependence of the results on the Dirac structure and on the free parameter (b) appearing in the general baryon current is considered. Comparison of our results on F/D ratio with the existing results is presented. |
1511.06326 | Leonard S. Kisslinger | Leonard S. Kisslinger, Zhou Li-juan, Ma Wei-xing | $\Psi(2S)$ Decay to $J/\Psi(1S)$ + 2$\pi$ or $J/\Psi(1S)$ +$\sigma$ +
2$\pi$ | 11 pages, 7 figures. arXiv admin note: substantial text overlap with
arXiv:1509.08366 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The BES Collaboration has measured $\Psi(2S)$ decay to $J/\Psi \pi^+\pi^-$.
Using the mixed hybrid theory for the $\Psi(2S)$ we estimate the decay to
$J/\Psi(1S)$ + $\sigma$. Using the known $\sigma \rightarrow 2\pi$ coupling
constant, we estimate the $\Psi(2S)$ to $J/\Psi(1S)$ + $2\pi$ decay rate and
angular distribution. This is an extension of our previous research on
$\Psi(2S)$ Decay to $J/\Psi(1S)$ +$\sigma$ + 2$\pi^o$, without the production
of 2$\pi^o$, and with an estimate of the $\sigma \rightarrow \pi^+ + \pi^-$
transition.
| [
{
"created": "Tue, 17 Nov 2015 21:55:31 GMT",
"version": "v1"
},
{
"created": "Mon, 31 Jul 2017 18:37:24 GMT",
"version": "v2"
},
{
"created": "Mon, 3 Jun 2019 13:54:36 GMT",
"version": "v3"
}
] | 2020-05-15 | [
[
"Kisslinger",
"Leonard S.",
""
],
[
"Li-juan",
"Zhou",
""
],
[
"Wei-xing",
"Ma",
""
]
] | The BES Collaboration has measured $\Psi(2S)$ decay to $J/\Psi \pi^+\pi^-$. Using the mixed hybrid theory for the $\Psi(2S)$ we estimate the decay to $J/\Psi(1S)$ + $\sigma$. Using the known $\sigma \rightarrow 2\pi$ coupling constant, we estimate the $\Psi(2S)$ to $J/\Psi(1S)$ + $2\pi$ decay rate and angular distribution. This is an extension of our previous research on $\Psi(2S)$ Decay to $J/\Psi(1S)$ +$\sigma$ + 2$\pi^o$, without the production of 2$\pi^o$, and with an estimate of the $\sigma \rightarrow \pi^+ + \pi^-$ transition. |
1303.0659 | Asmita Mukherjee | Asmita Mukherjee, Werner Vogelsang | Jet Production in $pp$ Collisions: Dependence on Jet Algorithm | Prepared for the Third Workshop on the QCD Structure of the Nucleon :
QCD N'12, 22-26 October, 2012, Bilbao, Spain | null | 10.1393/ncc/i2013-11589-y | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We report on a recent calculation of single-inclusive high-$p_T$ jet
production in unpolarized and longitudinally polarized $pp$ collisions at RHIC,
investigating the effect of the algorithm adopted to define the jets on the
numerical results for cross sections and spin asymmetries.
| [
{
"created": "Mon, 4 Mar 2013 09:58:28 GMT",
"version": "v1"
}
] | 2022-03-02 | [
[
"Mukherjee",
"Asmita",
""
],
[
"Vogelsang",
"Werner",
""
]
] | We report on a recent calculation of single-inclusive high-$p_T$ jet production in unpolarized and longitudinally polarized $pp$ collisions at RHIC, investigating the effect of the algorithm adopted to define the jets on the numerical results for cross sections and spin asymmetries. |
2312.11320 | Marek Matas | Jan Cepila, Jesus Guillermo Contreras, Marek Matas, Alexandra
Ridzikova | Incoherent ${\rm J}/\psi$ production at large $|t|$ identifies the onset
of saturation at the LHC | 18 pages, 3 figures | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We predict that the onset of gluon saturation can be uniquely identified
using incoherent ${\rm J}/\psi$ production in Pb$\unicode{x2013}$Pb collisions
at currently accessible energies of the LHC. The diffractive incoherent
photo-production of a ${\rm J}/\psi$ vector meson off a hadron provides
information on the partonic structure of the hadron. Within the Good-Walker
approach it specifically measures the variance over possible target
configurations of the hadronic colour field. For this process then, gluon
saturation sets in when the cross section reaches a maximum, as a function of
the centre-of-mass energy of the photon-hadron system ($W$), and then
decreases. We benchmark the energy-dependent hot-spot model against data from
HERA and the LHC and demonstrate a good description of the available data. We
show that the study of the energy dependence of the incoherent production of
${\rm J}/\psi$ allows us to pinpoint the onset of saturation effects by
selecting the region of Mandelstam-$t$ around 1 GeV$^2$ where the contribution
of hot spots is dominant. We predict the onset of saturation in a Pb target to
occur for $W$ around a few hundred GeV. This can be measured with current data
in ultra-peripheral Pb$\unicode{x2013}$Pb collisions at the LHC.
| [
{
"created": "Mon, 18 Dec 2023 16:16:22 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Mar 2024 12:44:21 GMT",
"version": "v2"
}
] | 2024-03-28 | [
[
"Cepila",
"Jan",
""
],
[
"Contreras",
"Jesus Guillermo",
""
],
[
"Matas",
"Marek",
""
],
[
"Ridzikova",
"Alexandra",
""
]
] | We predict that the onset of gluon saturation can be uniquely identified using incoherent ${\rm J}/\psi$ production in Pb$\unicode{x2013}$Pb collisions at currently accessible energies of the LHC. The diffractive incoherent photo-production of a ${\rm J}/\psi$ vector meson off a hadron provides information on the partonic structure of the hadron. Within the Good-Walker approach it specifically measures the variance over possible target configurations of the hadronic colour field. For this process then, gluon saturation sets in when the cross section reaches a maximum, as a function of the centre-of-mass energy of the photon-hadron system ($W$), and then decreases. We benchmark the energy-dependent hot-spot model against data from HERA and the LHC and demonstrate a good description of the available data. We show that the study of the energy dependence of the incoherent production of ${\rm J}/\psi$ allows us to pinpoint the onset of saturation effects by selecting the region of Mandelstam-$t$ around 1 GeV$^2$ where the contribution of hot spots is dominant. We predict the onset of saturation in a Pb target to occur for $W$ around a few hundred GeV. This can be measured with current data in ultra-peripheral Pb$\unicode{x2013}$Pb collisions at the LHC. |
hep-ph/0101085 | Allen Caldwell | Allen C. Caldwell and Mara S. Soares | Vector Meson Production in the Golec-Biernat Wuesthoff Model | null | Nucl.Phys. A696 (2001) 125-137 | 10.1016/S0375-9474(01)01117-4 | null | hep-ph | null | We apply the Golec-Biernat Wuesthoff model in the calculation of vector meson
photo- and electroproduction. Starting from very simple non-relativistic wave
functions we show that the model provides a good description of $J/\Psi$ cross
sections in wide $Q^2$ and $W$ ranges. For the light mesons one obtains the
approximately correct $W$ dependence and ratio of longitudinal to transverse
cross sections, although in this case the normalization, affected mainly by the
wave function employed, is not in good agreement with data.
| [
{
"created": "Tue, 9 Jan 2001 18:00:16 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Caldwell",
"Allen C.",
""
],
[
"Soares",
"Mara S.",
""
]
] | We apply the Golec-Biernat Wuesthoff model in the calculation of vector meson photo- and electroproduction. Starting from very simple non-relativistic wave functions we show that the model provides a good description of $J/\Psi$ cross sections in wide $Q^2$ and $W$ ranges. For the light mesons one obtains the approximately correct $W$ dependence and ratio of longitudinal to transverse cross sections, although in this case the normalization, affected mainly by the wave function employed, is not in good agreement with data. |
hep-ph/0303063 | Igor Ivanov | I.P. Ivanov (IM, Novosibirsk, Russia and IKP; KFA Juelich, Germany) | The hard scale in the exclusive rho-meson production in diffractive DIS | 14 pages, 7 eps figures | Phys.Rev. D68 (2003) 032001 | 10.1103/PhysRevD.68.032001 | FZJ-IKP(Th)-2003-XX | hep-ph hep-ex | null | We re-examine the issue of the pQCD factorization scale in the exclusive rho
production in diffractive DIS from the k_t-factorization point of view. We find
that this scale differs significantly from, and possesses much flatter Q^2
behavior than widely used value (Q^2 + m_\rho^2)/4. With these results in mind,
we discuss the Q^2 shape of the rho meson production cross section. We
introduce rescaled cross sections, which might provide further insight into the
dynamics of rho production. We also comment on the recent ZEUS observation of
energy-independent ratio sigma(gamma* p --> rho p) / sigma_{tot}(gamma*p).
| [
{
"created": "Fri, 7 Mar 2003 18:49:51 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Ivanov",
"I. P.",
"",
"IM, Novosibirsk, Russia and IKP; KFA Juelich, Germany"
]
] | We re-examine the issue of the pQCD factorization scale in the exclusive rho production in diffractive DIS from the k_t-factorization point of view. We find that this scale differs significantly from, and possesses much flatter Q^2 behavior than widely used value (Q^2 + m_\rho^2)/4. With these results in mind, we discuss the Q^2 shape of the rho meson production cross section. We introduce rescaled cross sections, which might provide further insight into the dynamics of rho production. We also comment on the recent ZEUS observation of energy-independent ratio sigma(gamma* p --> rho p) / sigma_{tot}(gamma*p). |
1407.6355 | Yang Bai | Yang Bai and Wai-Yee Keung | Dips at Colliders | changed the conclusion for the existence of dips for the vanishing
mass-on-shell interactions, added a section about dip structures with a zero
in the vertex form factor | Int. J. Mod. Phys. A 30, 1550120 (2015) | 10.1142/S0217751X15501201 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We categorize new physics signatures that manifest themselves as a "dip"
structure at colliders. One potential way to realize a dip is to require
interactions to be zero when all particles are mass on-shell, but not if one or
more are mass off-shell. For three particle interactions, we have found three
interesting cases: one massive gauge boson with two identical scalars; one
massless gauge boson with two different scalars; one massive gauge boson with
two identical massless gauge bosons. For each case, we identify the relevant
effective operators to explore its dip signature at the LHC. Unfortunately, the
unstable particle with a vanishing mass-on-shell interaction has a complex mass
which is coincident with the complex pole in its propagator. As a result, a
contact-like amplitude without a dip is produced. We then point out two other
interesting ways that generate a dip in the cross section. The first way has a
dip signature due to a zero in the vertex form factor of the time-like momentum
in the s-channel. In the second way, the dip plus bump signature appears
because there is destructive interference among processes of exchanging
different s-channel particles.
| [
{
"created": "Wed, 23 Jul 2014 20:00:02 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Aug 2014 15:04:55 GMT",
"version": "v2"
}
] | 2015-07-22 | [
[
"Bai",
"Yang",
""
],
[
"Keung",
"Wai-Yee",
""
]
] | We categorize new physics signatures that manifest themselves as a "dip" structure at colliders. One potential way to realize a dip is to require interactions to be zero when all particles are mass on-shell, but not if one or more are mass off-shell. For three particle interactions, we have found three interesting cases: one massive gauge boson with two identical scalars; one massless gauge boson with two different scalars; one massive gauge boson with two identical massless gauge bosons. For each case, we identify the relevant effective operators to explore its dip signature at the LHC. Unfortunately, the unstable particle with a vanishing mass-on-shell interaction has a complex mass which is coincident with the complex pole in its propagator. As a result, a contact-like amplitude without a dip is produced. We then point out two other interesting ways that generate a dip in the cross section. The first way has a dip signature due to a zero in the vertex form factor of the time-like momentum in the s-channel. In the second way, the dip plus bump signature appears because there is destructive interference among processes of exchanging different s-channel particles. |
1504.06490 | Rafal Maciula | Andreas van Hameren, Rafal Maciula and Antoni Szczurek | Production of two charm quark-antiquark pairs in single-parton
scattering within the $k_t$-factorization approach | 14 pages, 12 figures | null | 10.1016/j.physletb.2015.06.061 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present first results for the $2 \to 4$ single-parton scattering $g g \to
c \bar c c \bar c$ subprocess for the first time fully within the
$k_t$-factorization approach. In this calculation we have used the
Kimber-Martin-Ryskin unintegrated gluon distribution which effectively includes
some class of higher-order gluon emissions, and an off-shell matrix element
squared calculated using recently developed techniques. The results are
compared with our earlier result obtained within the collinear-factorization
approach. Only slightly larger cross sections are obtained than in the case of
the collinear approach. Inclusion of transverse momenta of gluons entering the
hard process leads to a much stronger azimuthal decorrelation between $c c$ and
$\bar c \bar c$ than in the collinear-factorization approach. A comparison to
predictions of double parton scattering (DPS) results and the LHCb data
strongly suggests that the assumption of two fully independent DPS ($g g \to c
\bar c \otimes g g \to c \bar c$) may be too approximate.
| [
{
"created": "Fri, 24 Apr 2015 13:01:29 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Apr 2015 11:01:55 GMT",
"version": "v2"
}
] | 2015-07-01 | [
[
"van Hameren",
"Andreas",
""
],
[
"Maciula",
"Rafal",
""
],
[
"Szczurek",
"Antoni",
""
]
] | We present first results for the $2 \to 4$ single-parton scattering $g g \to c \bar c c \bar c$ subprocess for the first time fully within the $k_t$-factorization approach. In this calculation we have used the Kimber-Martin-Ryskin unintegrated gluon distribution which effectively includes some class of higher-order gluon emissions, and an off-shell matrix element squared calculated using recently developed techniques. The results are compared with our earlier result obtained within the collinear-factorization approach. Only slightly larger cross sections are obtained than in the case of the collinear approach. Inclusion of transverse momenta of gluons entering the hard process leads to a much stronger azimuthal decorrelation between $c c$ and $\bar c \bar c$ than in the collinear-factorization approach. A comparison to predictions of double parton scattering (DPS) results and the LHCb data strongly suggests that the assumption of two fully independent DPS ($g g \to c \bar c \otimes g g \to c \bar c$) may be too approximate. |
hep-ph/9908505 | Joseph D. Lykken | Joseph Lykken and Satyanarayan Nandi | Asymmetrical large extra dimensions | 12 pages, 1 figure, improved discussion of collider signatures | Phys.Lett. B485 (2000) 224-230 | 10.1016/S0370-2693(00)00667-5 | FERMILAB-PUB-99/242-T | hep-ph | null | We study scenarios in which there is a hierarchy of two sets of large
compactified extra dimensions. One particularly interesting case has a single
millimeter size extra dimension and five TeV^{-1} size dimensions. The Standard
Model gauge bosons have Kaluza-Klein excitations with respect to one of the TeV
scale dimensions. We discuss astrophysical constraints on this scenario, as
well as prospects for signals at future high energy colliders.
| [
{
"created": "Mon, 30 Aug 1999 17:05:50 GMT",
"version": "v1"
},
{
"created": "Mon, 22 May 2000 16:22:02 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Lykken",
"Joseph",
""
],
[
"Nandi",
"Satyanarayan",
""
]
] | We study scenarios in which there is a hierarchy of two sets of large compactified extra dimensions. One particularly interesting case has a single millimeter size extra dimension and five TeV^{-1} size dimensions. The Standard Model gauge bosons have Kaluza-Klein excitations with respect to one of the TeV scale dimensions. We discuss astrophysical constraints on this scenario, as well as prospects for signals at future high energy colliders. |
hep-ph/0608126 | Tomo Takahashi | Junji Hisano, Kaiki Taro Inoue and Tomo Takahashi | Constraining SuperWIMPy and Warm Subhalos with Future Submillilensing | 14 pages, 2 figures, revised version accepted for publication in PLB | Phys.Lett.B643:141-146,2006 | 10.1016/j.physletb.2006.10.050 | null | hep-ph | null | We propose to observe QSO-galaxy strong lens systems to give a new constraint
on the damping scale of the initial fluctuations. We find that the future
observation of submilliarc scale astrometric shifts of the multiple lensed
images of QSOs would find \sim 10^{(3-9)} M_{\odot} subhalos inside the
macrolens halo. The superweakly interacting massive particles (superWIMPs)
produced from a WIMP decay and the warm dark matter (WDM) particles that
predict a comoving damping scale larger than \sim 2 kpc can be constrained if
\sim 10^3 M_{\odot} subhalos are detected.
| [
{
"created": "Fri, 11 Aug 2006 05:31:47 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Oct 2006 08:22:44 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Hisano",
"Junji",
""
],
[
"Inoue",
"Kaiki Taro",
""
],
[
"Takahashi",
"Tomo",
""
]
] | We propose to observe QSO-galaxy strong lens systems to give a new constraint on the damping scale of the initial fluctuations. We find that the future observation of submilliarc scale astrometric shifts of the multiple lensed images of QSOs would find \sim 10^{(3-9)} M_{\odot} subhalos inside the macrolens halo. The superweakly interacting massive particles (superWIMPs) produced from a WIMP decay and the warm dark matter (WDM) particles that predict a comoving damping scale larger than \sim 2 kpc can be constrained if \sim 10^3 M_{\odot} subhalos are detected. |
2107.04242 | Ruiyu Zhou | Wei Cheng, Tao Qian, Qing Yu, Hua Zhou, and Rui-Yu Zhou | Gravitational Wave From Axion-like Particle Inflation | 7 pages, 5 figures | null | 10.1103/PhysRevD.104.103502 | null | hep-ph astro-ph.CO astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | In this paper, we investigate the Axion-like Particle inflation by applying
the multi-nature inflation model, where the end of inflation is achieved
through the phase transition (PT). The events of PT should not be less than
$200$, which results in the free parameter $n\geq404$. Under the latest CMB
restrictions, we found that the inflation energy is fixed at $10^{15}
\rm{GeV}$. Then, we deeply discussed the corresponding stochastic background of
the primordial gravitational wave (GW) during inflation. We study the two kinds
of $n$ cases, i.e., $n=404, 2000$. We observe that the magnitude of $n$ is
negligible for the physical observations, such as $n_s$, $r$, $\Lambda$, and
$\Omega_{\rm{GW}}h^2$. In the low-frequency regions, the GW is dominated by the
quantum fluctuations, and this GW can be detected by Decigo at
$10^{-1}~\rm{Hz}$. However, GW generated by PT dominates the high-frequency
regions, which is expected to be detected by future 3DSR detector.
| [
{
"created": "Fri, 9 Jul 2021 06:35:10 GMT",
"version": "v1"
}
] | 2021-11-17 | [
[
"Cheng",
"Wei",
""
],
[
"Qian",
"Tao",
""
],
[
"Yu",
"Qing",
""
],
[
"Zhou",
"Hua",
""
],
[
"Zhou",
"Rui-Yu",
""
]
] | In this paper, we investigate the Axion-like Particle inflation by applying the multi-nature inflation model, where the end of inflation is achieved through the phase transition (PT). The events of PT should not be less than $200$, which results in the free parameter $n\geq404$. Under the latest CMB restrictions, we found that the inflation energy is fixed at $10^{15} \rm{GeV}$. Then, we deeply discussed the corresponding stochastic background of the primordial gravitational wave (GW) during inflation. We study the two kinds of $n$ cases, i.e., $n=404, 2000$. We observe that the magnitude of $n$ is negligible for the physical observations, such as $n_s$, $r$, $\Lambda$, and $\Omega_{\rm{GW}}h^2$. In the low-frequency regions, the GW is dominated by the quantum fluctuations, and this GW can be detected by Decigo at $10^{-1}~\rm{Hz}$. However, GW generated by PT dominates the high-frequency regions, which is expected to be detected by future 3DSR detector. |
2305.17452 | Shubham Mishra | Shubham Mishra, Sourav Pal, Aditya Srivastav, Anurag Tripathi | Multiparton Cwebs at five loops | The current version matches with the accepted JHEP version. The other
details are: 51 pages, 32 figures, 28 tables and 1 ancillary file | null | null | null | hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | Scattering amplitudes involving multiple partons are plagued with infrared
singularities. The soft singularities of the amplitude are captured by the soft
function which is defined as the vacuum expectation value of Wilson line
correlators. Renormalization properties of soft function allows us to write it
as an exponential of the finite soft anomalous dimension. An efficient way to
study the soft function is through a set of Feynman diagrams known as Cwebs
(webs). We present the mixing matrices and exponentiated colour factors (ECFs)
for the Cwebs at five loops that connect six Wilson lines, except those that
are related by relabeling of Wilson lines. Further, we express these ECFs in
terms of 29 basis colour factors. We also find that this basis can be
categorized into two colour structures. Our results are the first key
ingredients for the calculation of the soft anomalous dimension at five loops.
| [
{
"created": "Sat, 27 May 2023 11:40:14 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Jul 2024 05:16:53 GMT",
"version": "v2"
}
] | 2024-07-02 | [
[
"Mishra",
"Shubham",
""
],
[
"Pal",
"Sourav",
""
],
[
"Srivastav",
"Aditya",
""
],
[
"Tripathi",
"Anurag",
""
]
] | Scattering amplitudes involving multiple partons are plagued with infrared singularities. The soft singularities of the amplitude are captured by the soft function which is defined as the vacuum expectation value of Wilson line correlators. Renormalization properties of soft function allows us to write it as an exponential of the finite soft anomalous dimension. An efficient way to study the soft function is through a set of Feynman diagrams known as Cwebs (webs). We present the mixing matrices and exponentiated colour factors (ECFs) for the Cwebs at five loops that connect six Wilson lines, except those that are related by relabeling of Wilson lines. Further, we express these ECFs in terms of 29 basis colour factors. We also find that this basis can be categorized into two colour structures. Our results are the first key ingredients for the calculation of the soft anomalous dimension at five loops. |
hep-ph/9909519 | Stephane Peigne' | Paul Hoyer and Stephane Peigne | Psi' to J/Psi Ratio in Diffractive Photoproduction | 4 pages, revtex | null | 10.1103/PhysRevD.61.031501 | NORDITA-1999/59 HE, LAPTH-749/99 | hep-ph | null | We evaluate the Psi' to J/Psi ratio in diffractive photoproduction in a
light-cone framework, using charmonium wave functions extracted from
non-relativistic potential models. Contrary to current belief, we find that the
best estimate for the ratio is a factor 2 to 5 below the data. The measured
ratio constrains the distribution of the charm quark-antiquark component of the
charmonium light-cone wave function and indicates that it is more compact than
in potential models. We predict that the inelastic photoproduction ratio will
be bigger than the elastic one, and will equal that measured in
hadroproduction.
| [
{
"created": "Mon, 27 Sep 1999 11:54:33 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Hoyer",
"Paul",
""
],
[
"Peigne",
"Stephane",
""
]
] | We evaluate the Psi' to J/Psi ratio in diffractive photoproduction in a light-cone framework, using charmonium wave functions extracted from non-relativistic potential models. Contrary to current belief, we find that the best estimate for the ratio is a factor 2 to 5 below the data. The measured ratio constrains the distribution of the charm quark-antiquark component of the charmonium light-cone wave function and indicates that it is more compact than in potential models. We predict that the inelastic photoproduction ratio will be bigger than the elastic one, and will equal that measured in hadroproduction. |
hep-ph/9809353 | Jun-ichi Kamoshita | Jun-ichi Kamoshita | Impact of Light Higgs Properties on the Determination of $\tan\beta$ and
$m_{susy}$ | 7 pages with 10 figures, to be published in Prog. Theor. Phys | Prog.Theor.Phys. 100 (1998) 773-780 | 10.1143/PTP.100.773 | OCHA-PP-123 | hep-ph hep-ex | null | We examine whether parameters related to the Higgs sector of the minimal
supersymmetric standard model can be determined by detailed study of the
production cross section and decay branching ratios of the Higgs boson.
Assuming that only the light Higgs boson will be observed at a future $e^+e^-$
linear collider with $\sqrt{s}=300\sim500$ GeV, we show that values of
$m_{susy}$ and $\tan\beta$ are restricted within a narrow region in the
$m_{susy}$ versus $\tan\beta$ plane by the combined analysis of the light Higgs
properties. It is also pointed out that, in some case, $\tan\beta$ may be
restricted to a relatively small value, $\tan\beta=1\sim5$.
| [
{
"created": "Sun, 13 Sep 1998 04:29:02 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Kamoshita",
"Jun-ichi",
""
]
] | We examine whether parameters related to the Higgs sector of the minimal supersymmetric standard model can be determined by detailed study of the production cross section and decay branching ratios of the Higgs boson. Assuming that only the light Higgs boson will be observed at a future $e^+e^-$ linear collider with $\sqrt{s}=300\sim500$ GeV, we show that values of $m_{susy}$ and $\tan\beta$ are restricted within a narrow region in the $m_{susy}$ versus $\tan\beta$ plane by the combined analysis of the light Higgs properties. It is also pointed out that, in some case, $\tan\beta$ may be restricted to a relatively small value, $\tan\beta=1\sim5$. |
2308.00741 | Yifan Chen | Yifan Chen, Xiao Xue, Vitor Cardoso | Black Holes as Neutrino Factories | 17 pages, 3 figures | null | null | DESY-23-109 | hep-ph astro-ph.CO astro-ph.HE gr-qc hep-ex | http://creativecommons.org/licenses/by/4.0/ | Ultralight bosons near rotating black holes can grow significantly via
superradiant energy extraction, potentially reaching field values close to the
Planck scale, thereby turning black holes into effective transducers for these
fields. The interaction between a boson field and fermions can initiate a
parametric production of fermions, potentially halting the exponential growth
and leading to a saturated state of the boson cloud. This dynamic offers a
framework for establishing limits on boson-neutrino interactions, which have
traditionally been restricted by neutrino self-interaction considerations. At
the saturation phase, boson clouds have the capacity to propel neutrinos to
TeV-scale energies, generating fluxes that surpass atmospheric neutrino fluxes
from nearby black holes. This mechanism extends to dark sector fermions,
leading to the generation of boosted dark matter. These fluxes open novel
avenues for observation through high-energy neutrino detectors like IceCube, as
well as through dark matter direct detection, by directing observational
efforts towards targeted black holes.
| [
{
"created": "Tue, 1 Aug 2023 18:00:00 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Mar 2024 13:25:27 GMT",
"version": "v2"
}
] | 2024-03-05 | [
[
"Chen",
"Yifan",
""
],
[
"Xue",
"Xiao",
""
],
[
"Cardoso",
"Vitor",
""
]
] | Ultralight bosons near rotating black holes can grow significantly via superradiant energy extraction, potentially reaching field values close to the Planck scale, thereby turning black holes into effective transducers for these fields. The interaction between a boson field and fermions can initiate a parametric production of fermions, potentially halting the exponential growth and leading to a saturated state of the boson cloud. This dynamic offers a framework for establishing limits on boson-neutrino interactions, which have traditionally been restricted by neutrino self-interaction considerations. At the saturation phase, boson clouds have the capacity to propel neutrinos to TeV-scale energies, generating fluxes that surpass atmospheric neutrino fluxes from nearby black holes. This mechanism extends to dark sector fermions, leading to the generation of boosted dark matter. These fluxes open novel avenues for observation through high-energy neutrino detectors like IceCube, as well as through dark matter direct detection, by directing observational efforts towards targeted black holes. |
hep-ph/0410322 | Antonio Pich | A. Pich | Present Status of Chiral Perturbation Theory | 6 pages. Invited talk at the 10th International Symposium on
Meson-Nucleon Physics and the Structure of the Nucleon (MENU 2004), Beijing,
China, August 29 - September 4, 2004 | Int.J.Mod.Phys. A20 (2005) 1613-1618 | 10.1142/S0217751X05023074 | IFIC/04-58, FTUV/04-1024 | hep-ph nucl-th | null | The basic ideas and methods of chiral perturbation theory are briefly
reviewed. I discuss the recent attempts to build an effective Lagrangian in the
resonance region and summarize the known large-N_C constraints on the
low-energy chiral couplings.
| [
{
"created": "Sun, 24 Oct 2004 18:25:27 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Pich",
"A.",
""
]
] | The basic ideas and methods of chiral perturbation theory are briefly reviewed. I discuss the recent attempts to build an effective Lagrangian in the resonance region and summarize the known large-N_C constraints on the low-energy chiral couplings. |
2012.11904 | Zhi-Hui Guo | Zhi-Hui Guo, J. A. Oller | A unified description of the hidden-charm tetraquark states
$Z_{cs}(3985)$, $Z_c(3900)$ and $X(4020)$ | 14 pages. To match the published version in PRD | Phys. Rev. D 103, 054021 (2021) | 10.1103/PhysRevD.103.054021 | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | The newly observed hidden-charm tetraquark state $Z_{cs}(3985)$, together
with $Z_c(3900)$ and $X(4020)$, are studied in the combined theoretical
framework of the effective range expansion, compositeness relation and the
decay width saturation. The elastic effective-range-expansion approach leads to
sensible results for the scattering lengths, effective ranges and the
compositeness coefficients, $i.e.$, the probabilities to find the
two-charm-meson molecule components in the tetraquark states. The
coupled-channel formalism by including the $J/\psi\pi$ and
$D\bar{D}^*/\bar{D}D^*$ to fulfill the constraints of the compositeness
relation and the decay width, confirms the elastic effective-range-expansion
results for the $Z_c(3900)$, by using the experimental inputs for the ratios of
the decay widths between $D\bar{D}^*/\bar{D}D^*$ and $J/\psi\pi$. With the
results from the elastic effective-range-expansion study as input for the
compositeness, we generalize the discussions to the $Z_{cs}(3985)$ by including
the $J/\psi K^{-}$ and $D_s^{-}D^{*0}/D_s^{*-}D^{0}$, and predict the partial
decay widths of the $J/\psi K^{-}$. Similar calculations are also carried out
for the $X(4020)$ by including the $h_c\pi$ and $D^*\bar{D}^*$, and the partial
decay widths of the $h_c\pi$ is predicted. Our results can provide useful
guidelines for future experimental measurements.
| [
{
"created": "Tue, 22 Dec 2020 10:07:43 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Mar 2021 16:16:31 GMT",
"version": "v2"
}
] | 2021-03-26 | [
[
"Guo",
"Zhi-Hui",
""
],
[
"Oller",
"J. A.",
""
]
] | The newly observed hidden-charm tetraquark state $Z_{cs}(3985)$, together with $Z_c(3900)$ and $X(4020)$, are studied in the combined theoretical framework of the effective range expansion, compositeness relation and the decay width saturation. The elastic effective-range-expansion approach leads to sensible results for the scattering lengths, effective ranges and the compositeness coefficients, $i.e.$, the probabilities to find the two-charm-meson molecule components in the tetraquark states. The coupled-channel formalism by including the $J/\psi\pi$ and $D\bar{D}^*/\bar{D}D^*$ to fulfill the constraints of the compositeness relation and the decay width, confirms the elastic effective-range-expansion results for the $Z_c(3900)$, by using the experimental inputs for the ratios of the decay widths between $D\bar{D}^*/\bar{D}D^*$ and $J/\psi\pi$. With the results from the elastic effective-range-expansion study as input for the compositeness, we generalize the discussions to the $Z_{cs}(3985)$ by including the $J/\psi K^{-}$ and $D_s^{-}D^{*0}/D_s^{*-}D^{0}$, and predict the partial decay widths of the $J/\psi K^{-}$. Similar calculations are also carried out for the $X(4020)$ by including the $h_c\pi$ and $D^*\bar{D}^*$, and the partial decay widths of the $h_c\pi$ is predicted. Our results can provide useful guidelines for future experimental measurements. |
2404.10070 | Halil Gams{\i}zkan | Halil Gams{\i}zkan | Microscopic Black Hole Events in Future Hadron Colliders | 12 pages, 10 figures | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Microscopic black hole production at future hadron colliders is a promising
avenue to explore low scale gravity models like ADD. This study investigates
production cross-sections and final state properties of these black holes using
the BlackMax event generator. We analyze scenarios with varying proton-proton
collision energies (27 TeV and 100 TeV), number of extra dimensions (2, 4, and
6), and black hole rotation. Black holes are found to decay to up to seventeen
particles, which have high transverse momentum (up to 30 TeV) and concentrated
in the central region. This unique signature allows them to be distinguished
from background processes. The parameter space explored suggests future
colliders like HE-LHC and FCC-hh have the potential to probe low scale gravity
models.
| [
{
"created": "Mon, 15 Apr 2024 18:19:09 GMT",
"version": "v1"
}
] | 2024-04-17 | [
[
"Gamsızkan",
"Halil",
""
]
] | Microscopic black hole production at future hadron colliders is a promising avenue to explore low scale gravity models like ADD. This study investigates production cross-sections and final state properties of these black holes using the BlackMax event generator. We analyze scenarios with varying proton-proton collision energies (27 TeV and 100 TeV), number of extra dimensions (2, 4, and 6), and black hole rotation. Black holes are found to decay to up to seventeen particles, which have high transverse momentum (up to 30 TeV) and concentrated in the central region. This unique signature allows them to be distinguished from background processes. The parameter space explored suggests future colliders like HE-LHC and FCC-hh have the potential to probe low scale gravity models. |
1212.1281 | Maciej Rybczynski | M. Rybczynski, Z. Wlodarczyk and G. Wilk | Scaling behavior of transverse momenta distributions in hadronic and
nuclear collisions | 6 pages, 8 figures, presented at the 42 International Symposium on
Multiparticle Dynamics (ISMD 2012), Kielce, Poland | Acta Phys.Polon.Supp. 6 (2013) 507-512 | 10.5506/APhysPolBSupp.6.507 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has been recently noticed that transverse momenta ($p_T$) distributions
observed in high energy production processes exhibit remarkably universal
scaling behavior. This is seen when they are in some suitable variable,
replacing the usual $p_T$. On the other hand, it is also known that transverse
momenta distributions in general follow a power-like Tsallis distribution,
rather than an exponential Boltzmann-Gibbs, with a (generally energy dependent)
nonextensivity parameter $q$. We now show that it is possible to choose a
suitable variable such that $p_T$ distributions of particles produced in
proton-proton interactions in a wide energy range can be fitted by the same
Tsallis distribution (with the same, energy independent, value of the
$q$-parameter). Similar scaling behavior in nucleus-nucleus collisions is also
observed. The possible dynamical origin of the q parameter used in these fits
will be discussed.
| [
{
"created": "Thu, 6 Dec 2012 10:40:55 GMT",
"version": "v1"
}
] | 2015-04-03 | [
[
"Rybczynski",
"M.",
""
],
[
"Wlodarczyk",
"Z.",
""
],
[
"Wilk",
"G.",
""
]
] | It has been recently noticed that transverse momenta ($p_T$) distributions observed in high energy production processes exhibit remarkably universal scaling behavior. This is seen when they are in some suitable variable, replacing the usual $p_T$. On the other hand, it is also known that transverse momenta distributions in general follow a power-like Tsallis distribution, rather than an exponential Boltzmann-Gibbs, with a (generally energy dependent) nonextensivity parameter $q$. We now show that it is possible to choose a suitable variable such that $p_T$ distributions of particles produced in proton-proton interactions in a wide energy range can be fitted by the same Tsallis distribution (with the same, energy independent, value of the $q$-parameter). Similar scaling behavior in nucleus-nucleus collisions is also observed. The possible dynamical origin of the q parameter used in these fits will be discussed. |
hep-ph/0109178 | Stefano Forte | Guido Altarelli, Richard D. Ball, Stefano Forte | Factorization and Resummation of Small x Scaling Violations with Running
Coupling | 30 pages, 8 figures, plain TeX with harvmac | Nucl.Phys.B621:359-387,2002 | 10.1016/S0550-3213(01)00563-6 | CERN-TH/2001-206, Edinburgh 2001-10, RM3-TH/01-08 | hep-ph | null | We discuss the inclusion of running coupling effects in perturbative small x
evolution equations. We show that a running coupling BFKL-like x-evolution
equation is fully compatible, up to higher twist corrections, with the standard
factorized perturbative evolution of parton distributions. We then use this
result, combined with the well-known Airy asymptotics, to prove that the
oscillations which are present in the running-coupling BFKL solution do not
affect the associated splitting functions, which instead remain smooth in the
small x limit. This allows us to give a prescription to include
running-coupling corrections in the small-x resummation of scaling violations.
We show that these corrections are small in the HERA region.
| [
{
"created": "Thu, 20 Sep 2001 09:27:22 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Altarelli",
"Guido",
""
],
[
"Ball",
"Richard D.",
""
],
[
"Forte",
"Stefano",
""
]
] | We discuss the inclusion of running coupling effects in perturbative small x evolution equations. We show that a running coupling BFKL-like x-evolution equation is fully compatible, up to higher twist corrections, with the standard factorized perturbative evolution of parton distributions. We then use this result, combined with the well-known Airy asymptotics, to prove that the oscillations which are present in the running-coupling BFKL solution do not affect the associated splitting functions, which instead remain smooth in the small x limit. This allows us to give a prescription to include running-coupling corrections in the small-x resummation of scaling violations. We show that these corrections are small in the HERA region. |
hep-ph/0401092 | Karol Kovarik | K. Kovarik, C. Weber, H. Eberl, W. Majerotto | Complete one--loop corrections to e+e- -> sf_i sf_j | 15 pages, 7 figures, shortened version for publication | Phys.Lett. B591 (2004) 242-254 | 10.1016/j.physletb.2004.04.036 | HEPHY-PUB 784/04 | hep-ph | null | We have calculated the complete one-loop corrections to the sfermion pair
production process e+e- -> sf_i sf_j (f = t, b, tau, tau-neutrino) in the
Minimal Supersymmetric Standard Model. Our results also include the previously
calculated SUSY-QCD corrections. We present the details of the renormalization
scheme used. It is found that the weak corrections are of the same magnitude as
the SUSY-QCD corrections at higher energies (sqrt(s) ~ 1TeV). At these energies
the main part of the weak corrections stems from the box contribution. This is
best seen in sneutrino production.
| [
{
"created": "Tue, 13 Jan 2004 15:01:45 GMT",
"version": "v1"
},
{
"created": "Tue, 25 May 2004 12:25:09 GMT",
"version": "v2"
}
] | 2010-04-05 | [
[
"Kovarik",
"K.",
""
],
[
"Weber",
"C.",
""
],
[
"Eberl",
"H.",
""
],
[
"Majerotto",
"W.",
""
]
] | We have calculated the complete one-loop corrections to the sfermion pair production process e+e- -> sf_i sf_j (f = t, b, tau, tau-neutrino) in the Minimal Supersymmetric Standard Model. Our results also include the previously calculated SUSY-QCD corrections. We present the details of the renormalization scheme used. It is found that the weak corrections are of the same magnitude as the SUSY-QCD corrections at higher energies (sqrt(s) ~ 1TeV). At these energies the main part of the weak corrections stems from the box contribution. This is best seen in sneutrino production. |
1011.1779 | Elena Narynskaya | N.V.Mikheev, E.N.Narynskaya | Neutrino magnetic moment in a magnetized plasma | 7 page, 1 figures, based on the talk presented by E.N.Narynskaya at
the XVI International Seminar Quarks'2010, Kolomna, Moscow Region, June 6-12,
2010, to appear in the Proceedings | Phys.Atom.Nucl.73:2133-2138,2010 | 10.1134/S1063778810120197 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The contribution of a magnetized plasma to the neutrino magnetic moment is
calculated. It is shown that only part of the additional neutrino energy in
magnetized plasma connecting with its spin and magnetic field strength defines
the neutrino magnetic moment. It is found that the presence of magnetized
plasma does not lead to the considerable increase of the neutrino magnetic
moment in contrast to the results presented in literature previously.
| [
{
"created": "Mon, 8 Nov 2010 11:57:11 GMT",
"version": "v1"
}
] | 2011-01-27 | [
[
"Mikheev",
"N. V.",
""
],
[
"Narynskaya",
"E. N.",
""
]
] | The contribution of a magnetized plasma to the neutrino magnetic moment is calculated. It is shown that only part of the additional neutrino energy in magnetized plasma connecting with its spin and magnetic field strength defines the neutrino magnetic moment. It is found that the presence of magnetized plasma does not lead to the considerable increase of the neutrino magnetic moment in contrast to the results presented in literature previously. |
1011.0269 | Yadong Yang | Xin-Qiang Li, Fang Su, Ya-Dong Yang | Determination of the strong coupling $g_{B^* B\pi}$ from semi-leptonic
$B\to \pi \ell \nu$ decay | 19 pages, no figure. Revised | Phys.Rev.D83:054019,2011 | 10.1103/PhysRevD.83.054019 | null | hep-ph | http://creativecommons.org/licenses/by/3.0/ | According to heavy-meson chiral perturbation theory, the vector form factor
$f_+(q^2)$ of exclusive semi-leptonic decay $B\to \pi \ell \nu$ is closely
related, at least in the soft-pion region (i.e., $q^{2} \sim (m_B-m_{\pi})^2$),
to the strong coupling $g_{B^* B\pi}$ or the normalized coupling $\hat g$.
Combining the precisely measured $q^2$ spectrum of $B\to \pi \ell \nu$ decay by
the BaBar and Belle collaborations with several parametrizations of the form
factor $f_+(q^2)$, we can extract these couplings from the residue of the form
factor at the $B^*$ pole, which relies on an extrapolation of the form factor
from the semi-leptonic region to the unphysical point $q^2=m_{B^*}^2$.
Comparing the extracted values with the other experimental and theoretical
estimates, we can test these various form-factor parametrizations, which differ
from each other by the amount of physical information embedded in. It is found
that the extracted values based on the BK, BZ and BCL parametrizations are
consistent with each other and roughly in agreement with the other theoretical
and lattice estimates, while the BGL ansatz, featured by a spurious, unwanted
pole at the threshold of the cut, gives a neatly larger value.
| [
{
"created": "Mon, 1 Nov 2010 08:52:07 GMT",
"version": "v1"
},
{
"created": "Fri, 5 Nov 2010 08:31:33 GMT",
"version": "v2"
},
{
"created": "Tue, 25 Jan 2011 11:34:50 GMT",
"version": "v3"
}
] | 2011-03-22 | [
[
"Li",
"Xin-Qiang",
""
],
[
"Su",
"Fang",
""
],
[
"Yang",
"Ya-Dong",
""
]
] | According to heavy-meson chiral perturbation theory, the vector form factor $f_+(q^2)$ of exclusive semi-leptonic decay $B\to \pi \ell \nu$ is closely related, at least in the soft-pion region (i.e., $q^{2} \sim (m_B-m_{\pi})^2$), to the strong coupling $g_{B^* B\pi}$ or the normalized coupling $\hat g$. Combining the precisely measured $q^2$ spectrum of $B\to \pi \ell \nu$ decay by the BaBar and Belle collaborations with several parametrizations of the form factor $f_+(q^2)$, we can extract these couplings from the residue of the form factor at the $B^*$ pole, which relies on an extrapolation of the form factor from the semi-leptonic region to the unphysical point $q^2=m_{B^*}^2$. Comparing the extracted values with the other experimental and theoretical estimates, we can test these various form-factor parametrizations, which differ from each other by the amount of physical information embedded in. It is found that the extracted values based on the BK, BZ and BCL parametrizations are consistent with each other and roughly in agreement with the other theoretical and lattice estimates, while the BGL ansatz, featured by a spurious, unwanted pole at the threshold of the cut, gives a neatly larger value. |
1604.01189 | Valery Schegelsky A | V.A. Schegelsky and M.G. Ryskin | Multiparticle production: an old-fashioned view | null | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the dynamics of high energy multiparticle production and discuss
how the space-time picture of inelastic interaction may reveal itself in
identical particles Bose-Einstein correlations.
| [
{
"created": "Tue, 5 Apr 2016 09:06:42 GMT",
"version": "v1"
}
] | 2016-04-06 | [
[
"Schegelsky",
"V. A.",
""
],
[
"Ryskin",
"M. G.",
""
]
] | We consider the dynamics of high energy multiparticle production and discuss how the space-time picture of inelastic interaction may reveal itself in identical particles Bose-Einstein correlations. |
2112.05052 | Christoph Englert | Akanksha Bhardwaj, Christoph Englert, Robert Hankache, Andrew D.
Pilkington | Machine-enhanced CP-asymmetries in the Higgs sector | 10 pages, 7 figures, 2 tables, v2: added clarifications, references
updated, v3: version published in PLB | null | 10.1016/j.physletb.2022.137246 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Improving the sensitivity to CP-violation in the Higgs sector is one of the
pillars of the precision Higgs programme at the Large Hadron Collider. We
present a simple method that allows CP-sensitive observables to be directly
constructed from the output of neural networks. We show that these observables
have improved sensitivity to CP-violating effects in the production and decay
of the Higgs boson, when compared to the use of traditional angular observables
alone. The kinematic correlations identified by the neural networks can be used
to design new analyses based on angular observables, with a similar improvement
in sensitivity.
| [
{
"created": "Thu, 9 Dec 2021 17:24:44 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Dec 2021 00:13:02 GMT",
"version": "v2"
},
{
"created": "Mon, 27 Jun 2022 10:09:02 GMT",
"version": "v3"
}
] | 2022-06-28 | [
[
"Bhardwaj",
"Akanksha",
""
],
[
"Englert",
"Christoph",
""
],
[
"Hankache",
"Robert",
""
],
[
"Pilkington",
"Andrew D.",
""
]
] | Improving the sensitivity to CP-violation in the Higgs sector is one of the pillars of the precision Higgs programme at the Large Hadron Collider. We present a simple method that allows CP-sensitive observables to be directly constructed from the output of neural networks. We show that these observables have improved sensitivity to CP-violating effects in the production and decay of the Higgs boson, when compared to the use of traditional angular observables alone. The kinematic correlations identified by the neural networks can be used to design new analyses based on angular observables, with a similar improvement in sensitivity. |
2201.07441 | Utkarsh Patel | Sudhanwa Patra, Utkarsh Patel and Purushottam Sahu | LHC signatures of sterile neutrinos in a minimal radiative extended
seesaw framework | arXiv admin note: text overlap with arXiv:1903.04905,
arXiv:1801.03624 by other authors | International Journal of Modern Physics A (2021) 2150263,
S0217751X21502638 | 10.1142/S0217751X21502638 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | The presence of small neutrino masses and flavour mixings can be accounted
for naturally in various models about extensions of the standard model,
particularly in the seesaw mechanism models. In this work, we present a
minimally extended seesaw framework with two right-handed neutrinos, where the
active neutrino masses are derived in the radiative regime. Using the framework
it can be shown that within certain mass limits, the light neutrino mass term
can approach a form that is similar to its form under the type-I seesaw
mechanism. Apart from this, we show that the decay width of right-handed
neutrinos (produced through the decay of W boson in a particle collider) is
short enough to cause a sufficiently long lifetime for the particles, thus
ensuring an observable displacement in the LHC between the production and decay
vertices. We comment on the fact that these displaced vertex signatures thus
can serve as a means to verify the existence of these right-handed neutrinos in
future experiments. Lastly, we line up the possibility of our future work where
the vertex signatures of particles greater than the mass of W boson can be
worked upon.
| [
{
"created": "Wed, 19 Jan 2022 06:55:47 GMT",
"version": "v1"
}
] | 2022-01-20 | [
[
"Patra",
"Sudhanwa",
""
],
[
"Patel",
"Utkarsh",
""
],
[
"Sahu",
"Purushottam",
""
]
] | The presence of small neutrino masses and flavour mixings can be accounted for naturally in various models about extensions of the standard model, particularly in the seesaw mechanism models. In this work, we present a minimally extended seesaw framework with two right-handed neutrinos, where the active neutrino masses are derived in the radiative regime. Using the framework it can be shown that within certain mass limits, the light neutrino mass term can approach a form that is similar to its form under the type-I seesaw mechanism. Apart from this, we show that the decay width of right-handed neutrinos (produced through the decay of W boson in a particle collider) is short enough to cause a sufficiently long lifetime for the particles, thus ensuring an observable displacement in the LHC between the production and decay vertices. We comment on the fact that these displaced vertex signatures thus can serve as a means to verify the existence of these right-handed neutrinos in future experiments. Lastly, we line up the possibility of our future work where the vertex signatures of particles greater than the mass of W boson can be worked upon. |
hep-ph/9706477 | null | Tiehui (Ted) Liu | An Overview of $D^0\bar{D}^0$ Mixing Search Techniques | 7 pages, talk given at Symposium on Flavor Changing Neutral Currents:
Present and Future Studies, Santa Monica, Feb. 97 | null | null | PRINCETON/HEP/97-5 | hep-ph | null | The search for $D^0\bar{D}^0$ mixing may carry a large discovery potential
for new physics since the $D^0\bar{D}^0$ mixing rate is expected to be small in
the Standard Model. This paper gives a brief review of the experimental
techniques which can be used to search for $D^0\bar{D}^0$ mixing in the future.
Some ideas, applicable to future mixing searches at hadron machines (such as
Tevatron and LHC), and fixed target experiments (such as HEAR-B) are
introduced.
| [
{
"created": "Tue, 24 Jun 1997 00:36:15 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Tiehui",
"",
"",
"Ted"
],
[
"Liu",
"",
""
]
] | The search for $D^0\bar{D}^0$ mixing may carry a large discovery potential for new physics since the $D^0\bar{D}^0$ mixing rate is expected to be small in the Standard Model. This paper gives a brief review of the experimental techniques which can be used to search for $D^0\bar{D}^0$ mixing in the future. Some ideas, applicable to future mixing searches at hadron machines (such as Tevatron and LHC), and fixed target experiments (such as HEAR-B) are introduced. |
hep-ph/0407195 | Ruben Flores | J.J. Torres, Ruben Flores-Mendieta, M. Neri, A. Martinez, A. Garcia | Numerical precision radiative corrections to the Dalitz plot of baryon
semileptonic decays including the spin-momentum correlation of the decaying
and emitted baryons | 34 pages, 4 tables, no figures. Some sections have been shortened.
Conclusions remain unchanged | Phys.Rev.D70:093012,2004; Erratum-ibid.D75:019903,2007 | 10.1103/PhysRevD.70.093012 10.1103/PhysRevD.75.019903 | null | hep-ph | null | We calculate the radiative corrections to the angular correlation between the
polarization of the decaying and the direction of the emitted spin one-half
baryons in the semileptonic decay mode. The final results are presented, first,
with the triple integration of the bremsstrahlung photon ready to be performed
numerically and, second, in an analytical form. A third presentation of our
results in the form of numerical arrays of coefficients to be multiplied by the
quadratic products of form factors is discussed. This latter may be the most
practical one to use in Monte Carlo simulations. A series of crosschecks is
performed. Previous results to order (alpha/pi)(q/M_1) for the decays of
unpolarized baryons are reviewed, too, where q is the momentum transfer and M_1
is the mass of the decaying baryon. This paper is self-contained and organized
to make it accessible and reliable in the analysis of the Dalitz plot of
precision experiments involving heavy quarks and is not compromised to fixing
the form factors at predetermined values. It is assumed that the real photons
are kinematically discriminated. Otherwise, our results have a general
model-independent applicability.
| [
{
"created": "Fri, 16 Jul 2004 20:27:27 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Nov 2004 18:57:48 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Torres",
"J. J.",
""
],
[
"Flores-Mendieta",
"Ruben",
""
],
[
"Neri",
"M.",
""
],
[
"Martinez",
"A.",
""
],
[
"Garcia",
"A.",
""
]
] | We calculate the radiative corrections to the angular correlation between the polarization of the decaying and the direction of the emitted spin one-half baryons in the semileptonic decay mode. The final results are presented, first, with the triple integration of the bremsstrahlung photon ready to be performed numerically and, second, in an analytical form. A third presentation of our results in the form of numerical arrays of coefficients to be multiplied by the quadratic products of form factors is discussed. This latter may be the most practical one to use in Monte Carlo simulations. A series of crosschecks is performed. Previous results to order (alpha/pi)(q/M_1) for the decays of unpolarized baryons are reviewed, too, where q is the momentum transfer and M_1 is the mass of the decaying baryon. This paper is self-contained and organized to make it accessible and reliable in the analysis of the Dalitz plot of precision experiments involving heavy quarks and is not compromised to fixing the form factors at predetermined values. It is assumed that the real photons are kinematically discriminated. Otherwise, our results have a general model-independent applicability. |
1805.11650 | Sergei Chekanov V. | S. V. Chekanov | Imaging particle collision data for event classification using machine
learning | 20 pages, 4 figures | Nuclear Instruments and Methods in Physics Research Section A:
Accelerators, Spectrometers, Detectors and Associated Equipment, 931 (2019)
92-99 | 10.1016/j.nima.2019.04.031 | ANL-HEP-144006 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a method to organize experimental data from particle collision
experiments in a general format which can enable a simple visualisation and
effective classification of collision data using machine learning techniques.
The method is based on sparse fixed-size matrices with single- and two-particle
variables containing information on identified particles and jets. We
illustrate this method using an example of searches for new physics at the LHC
experiments.
| [
{
"created": "Tue, 29 May 2018 18:37:28 GMT",
"version": "v1"
},
{
"created": "Fri, 15 Mar 2019 08:38:06 GMT",
"version": "v2"
}
] | 2019-04-15 | [
[
"Chekanov",
"S. V.",
""
]
] | We propose a method to organize experimental data from particle collision experiments in a general format which can enable a simple visualisation and effective classification of collision data using machine learning techniques. The method is based on sparse fixed-size matrices with single- and two-particle variables containing information on identified particles and jets. We illustrate this method using an example of searches for new physics at the LHC experiments. |
1304.7927 | Paolo Torrielli | Stefano Frixione, Paolo Torrielli and Marco Zaro | Higgs production through vector-boson fusion at the NLO matched with
parton showers | 18 pages, 7 figures | null | 10.1016/j.physletb.2013.08.030 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a study of Higgs hadroproduction through vector-boson fusion at
the NLO in QCD matched with parton showers. We discuss the matching systematics
affecting this process through a comparison of the aMC@NLO predictions with the
POWHEG and the pure-NLO ones.
| [
{
"created": "Tue, 30 Apr 2013 09:13:47 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Sep 2013 06:14:52 GMT",
"version": "v2"
}
] | 2013-09-27 | [
[
"Frixione",
"Stefano",
""
],
[
"Torrielli",
"Paolo",
""
],
[
"Zaro",
"Marco",
""
]
] | We present a study of Higgs hadroproduction through vector-boson fusion at the NLO in QCD matched with parton showers. We discuss the matching systematics affecting this process through a comparison of the aMC@NLO predictions with the POWHEG and the pure-NLO ones. |
1411.5669 | Johannes Bl\"umlein | J. Bl\"umlein, A. De Freitas, and C. Schneider | Higher Order Heavy Quark Corrections to Deep-Inelastic Scattering | 17 pages, 10 figures, 3 style files, Nucl. Phys. (Proc. Suppl.),
Contribution to the Proceedings Final Meeting of DFG SFB-TR-9, to appear | null | null | DESY 14-159, DO--TH 14/22, SFB/CPP--14--73 , LPN 14--113 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The 3-loop heavy flavor corrections to deep-inelastic scattering are
essential for consistent next-to-next-to-leading order QCD analyses. We report
on the present status of the calculation of these corrections at large
virtualities $Q^2$. We also describe a series of mathematical,
computer-algebraic and combinatorial methods and special function spaces,
needed to perform these calculations. Finally, we briefly discuss the status of
measuring $\alpha_s(M_Z)$, the charm quark mass $m_c$, and the parton
distribution functions at next-to-next-to-leading order from the world
precision data on deep-inelastic scattering.
| [
{
"created": "Thu, 20 Nov 2014 20:41:41 GMT",
"version": "v1"
}
] | 2014-11-21 | [
[
"Blümlein",
"J.",
""
],
[
"De Freitas",
"A.",
""
],
[
"Schneider",
"C.",
""
]
] | The 3-loop heavy flavor corrections to deep-inelastic scattering are essential for consistent next-to-next-to-leading order QCD analyses. We report on the present status of the calculation of these corrections at large virtualities $Q^2$. We also describe a series of mathematical, computer-algebraic and combinatorial methods and special function spaces, needed to perform these calculations. Finally, we briefly discuss the status of measuring $\alpha_s(M_Z)$, the charm quark mass $m_c$, and the parton distribution functions at next-to-next-to-leading order from the world precision data on deep-inelastic scattering. |
hep-ph/0205271 | Bei-Lok Hu | E. Calzetta and B. L. Hu | Thermalization of an Interacting Quantum Field in the CTP-2PI
Next-to-leading-order Large N Scheme | Latex 31 pages with 10 figures, uses graphicx | null | null | umdpp02-052 | hep-ph | null | In this paper we use an O(N)-invariant scalar field of unbroken symmetry to
investigate whether an interacting quantum field at the next-to-leading order
Large $N$ approximation may show signs of thermalization. We develop the closed
time-path (CTP) two-particle irreducible (2PI) effective action in powers of
1/N, retaining up to next to leading order (O(1)) terms, and write down the
corresponding (truncated) Schwinger-Dyson equations for its two point function.
We show that in this approximation, the only translation invariant solutions to
the Schwinger - Dyson equations are thermal. This provides a useful temperature
concept without invoking a heat bath. When combined with the familiar
Kadanoff-Baym approach to quantum kinetic theory our result shows that at this
order of approximation thermalization can occur, at least if initial conditions
are smooth enough that a derivative expansion is valid. Our analytic result
provides support for similar claims in recent literature based on numerical
evidence.
| [
{
"created": "Thu, 23 May 2002 22:10:54 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Calzetta",
"E.",
""
],
[
"Hu",
"B. L.",
""
]
] | In this paper we use an O(N)-invariant scalar field of unbroken symmetry to investigate whether an interacting quantum field at the next-to-leading order Large $N$ approximation may show signs of thermalization. We develop the closed time-path (CTP) two-particle irreducible (2PI) effective action in powers of 1/N, retaining up to next to leading order (O(1)) terms, and write down the corresponding (truncated) Schwinger-Dyson equations for its two point function. We show that in this approximation, the only translation invariant solutions to the Schwinger - Dyson equations are thermal. This provides a useful temperature concept without invoking a heat bath. When combined with the familiar Kadanoff-Baym approach to quantum kinetic theory our result shows that at this order of approximation thermalization can occur, at least if initial conditions are smooth enough that a derivative expansion is valid. Our analytic result provides support for similar claims in recent literature based on numerical evidence. |
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