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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1904.01296 | Juan Nieves Dr. | C. W. Xiao, J. Nieves, E. Oset | Heavy quark spin symmetric molecular states from ${\bar
D}^{(*)}\Sigma_c^{(*)}$ and other coupled channels in the light of the recent
LHCb pentaquarks | 8 pages | Phys. Rev. D 100, 014021 (2019) | 10.1103/PhysRevD.100.014021 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the ${\bar D}^{(*)}\Sigma_c^{(*)}$ states, together with $J/\psi
N$ and other coupled channels, and take an interaction consistent with heavy
quark spin symmetry, with the dynamical input obtained from an extension of the
local hidden gauge approach. By fitting only one parameter to the recent three
pentaquark states reported by the LHCb collaboration, we can reproduce the
three of them in base to the mass and the width, providing for them the quantum
numbers and approximate molecular structure as $1/2^-$ $\bar{D} \Sigma_c$,
$1/2^-$ $\bar{D}^* \Sigma_c$, and $3/2^-$ $\bar{D}^* \Sigma_c$, and isospin
$I=1/2$. We find another state around 4374 MeV, of $3/2^-$ $\bar{D} \Sigma_c^*$
structure, for which indications appear in the experimental spectrum. Two other
near degenerate states of $1/2^-$ $\bar{D}^* \Sigma_c^*$ and $3/2^-$ $\bar{D}^*
\Sigma_c^*$ nature are also found around 4520 MeV, which although less clear,
are not incompatible with the observed spectrum. In addition, a $5/2^-$ $\bar
D^* \Sigma_c^*$ state at the same energy appears, which however does not couple
to $J/\psi p$ in $S-$wave, and hence it is not expected to show up in the LHCb
experiment.
| [
{
"created": "Tue, 2 Apr 2019 08:52:33 GMT",
"version": "v1"
}
] | 2019-07-24 | [
[
"Xiao",
"C. W.",
""
],
[
"Nieves",
"J.",
""
],
[
"Oset",
"E.",
""
]
] | We consider the ${\bar D}^{(*)}\Sigma_c^{(*)}$ states, together with $J/\psi N$ and other coupled channels, and take an interaction consistent with heavy quark spin symmetry, with the dynamical input obtained from an extension of the local hidden gauge approach. By fitting only one parameter to the recent three pentaquark states reported by the LHCb collaboration, we can reproduce the three of them in base to the mass and the width, providing for them the quantum numbers and approximate molecular structure as $1/2^-$ $\bar{D} \Sigma_c$, $1/2^-$ $\bar{D}^* \Sigma_c$, and $3/2^-$ $\bar{D}^* \Sigma_c$, and isospin $I=1/2$. We find another state around 4374 MeV, of $3/2^-$ $\bar{D} \Sigma_c^*$ structure, for which indications appear in the experimental spectrum. Two other near degenerate states of $1/2^-$ $\bar{D}^* \Sigma_c^*$ and $3/2^-$ $\bar{D}^* \Sigma_c^*$ nature are also found around 4520 MeV, which although less clear, are not incompatible with the observed spectrum. In addition, a $5/2^-$ $\bar D^* \Sigma_c^*$ state at the same energy appears, which however does not couple to $J/\psi p$ in $S-$wave, and hence it is not expected to show up in the LHCb experiment. |
1311.1511 | William Shepherd | Alexey A. Petrov and William Shepherd | Searching for dark matter at LHC with Mono-Higgs production | 13 pages, 5 figures | null | 10.1016/j.physletb.2014.01.051 | WSU-HEP-1308 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider LHC searches for dark matter in the mono-Higgs channel using the
tools of effective field theory. This channel takes unique advantage of the
presence of $SU(2)_L$ breaking in those operators to avoid the need for any
initial-state radiation, usually necessary to tag the production of invisible
particles. We find that sensitivities to parameters describing dark matter
interactions with standard model particles are comparable to those from monojet
searches for a subset of the usually-considered operators, and we present for
the first time bounds from collider searches on operators which couple DM to
only the Higgs field or its covariant derivatives.
| [
{
"created": "Wed, 6 Nov 2013 21:00:02 GMT",
"version": "v1"
}
] | 2015-06-17 | [
[
"Petrov",
"Alexey A.",
""
],
[
"Shepherd",
"William",
""
]
] | We consider LHC searches for dark matter in the mono-Higgs channel using the tools of effective field theory. This channel takes unique advantage of the presence of $SU(2)_L$ breaking in those operators to avoid the need for any initial-state radiation, usually necessary to tag the production of invisible particles. We find that sensitivities to parameters describing dark matter interactions with standard model particles are comparable to those from monojet searches for a subset of the usually-considered operators, and we present for the first time bounds from collider searches on operators which couple DM to only the Higgs field or its covariant derivatives. |
2107.06753 | Emanuele Re | Emanuele Re | MiNNLO$_{\rm PS}$: a new method to match NNLO QCD with parton showers | 5 pages, 2 figures. Contribution to the proceedings of the 55th
Rencontres de Moriond on QCD and High Energy Interactions, 27 March-3 April
2021 | null | null | LAPTH-Conf-026/21 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I describe MiNNLO$_{\rm PS}$, a novel method to match NNLO QCD computations
with Parton Showers, and present a selection of results for color-singlet
production at the LHC.
| [
{
"created": "Wed, 14 Jul 2021 15:04:09 GMT",
"version": "v1"
}
] | 2021-07-15 | [
[
"Re",
"Emanuele",
""
]
] | I describe MiNNLO$_{\rm PS}$, a novel method to match NNLO QCD computations with Parton Showers, and present a selection of results for color-singlet production at the LHC. |
2310.00609 | Zhun Lu | Huachao liu, Xiupeng xie, Zhun Lu | Gluon TMDs from J/$\psi$ production in longitudinally polarized deeply
inelastic scattering | 8 pages, 2 figures | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We investigate the feasibility of exploring the gluon
transverse-momentum-dependent distribution functions (TMDs) inside a
longitudinally polarized nucleon. We utilize quarkonium production via the
color-octet mechanism combined with TMD formalism in semi-inclusive deeply
inelastic scattering (SIDIS) at low transverse momentum as a tool to access
polarized gluon TMDs. The corresponding cross-section of the process is
expressed in terms of gluon TMDs and non-relativistic QCD matrix elements. We
provide the expressions for the $\sin2\phi$ azimuthal asymmetries of $J/\psi$
production in SIDIS with a unpolarized beam colliding on longitudinally
polarized nucleon. The asymmetry is contributed by the time-reversal-odd gluon
TMD $h_{1L}^{\perp \,g}(x,\boldsymbol{p}_T^2)$. The maximum possible asymmetry
deduced from the positivity bound is sizable and could be measured. We also
estimate the double longitudinal spin asymmetry $A_{LL}$ of $J/\psi$ production
using a spectator model result for $g_{1L}^g(x,\boldsymbol{p}_T^2)$.
| [
{
"created": "Sun, 1 Oct 2023 08:09:03 GMT",
"version": "v1"
}
] | 2023-10-03 | [
[
"liu",
"Huachao",
""
],
[
"xie",
"Xiupeng",
""
],
[
"Lu",
"Zhun",
""
]
] | We investigate the feasibility of exploring the gluon transverse-momentum-dependent distribution functions (TMDs) inside a longitudinally polarized nucleon. We utilize quarkonium production via the color-octet mechanism combined with TMD formalism in semi-inclusive deeply inelastic scattering (SIDIS) at low transverse momentum as a tool to access polarized gluon TMDs. The corresponding cross-section of the process is expressed in terms of gluon TMDs and non-relativistic QCD matrix elements. We provide the expressions for the $\sin2\phi$ azimuthal asymmetries of $J/\psi$ production in SIDIS with a unpolarized beam colliding on longitudinally polarized nucleon. The asymmetry is contributed by the time-reversal-odd gluon TMD $h_{1L}^{\perp \,g}(x,\boldsymbol{p}_T^2)$. The maximum possible asymmetry deduced from the positivity bound is sizable and could be measured. We also estimate the double longitudinal spin asymmetry $A_{LL}$ of $J/\psi$ production using a spectator model result for $g_{1L}^g(x,\boldsymbol{p}_T^2)$. |
2402.13983 | Stephan Narison | Stephan Narison (LUPM CNRS/IN2P3, Univ. Montpellier, and iHEPMAD,
Univ. Antananarivo - MG) | QCD parameters and SM-high precision from $e^+e^-$ to Hadrons: Updated | Latex sources, 19 pages, 8 figures, 3 tables. Some preliminaries
results have been presented at the alphas2024 workshop (5-9th february
2024-ECT*-Trento-IT). Section 9 on the determination of alpha_s from
tau-decay has been corrected. Version published in Nucl. Phys. A +
Corrigendum (to appear in Nucl. Phys. A) | null | 10.1016/j.nuclphysa.2024.122873 | null | hep-ph hep-ex hep-lat | http://creativecommons.org/publicdomain/zero/1.0/ | 1. I update my previous comparison of the theoretical value of the muon
anomaly with the new measurement and found $\Delta a_\mu\equiv
a_\mu^{exp}-a_\mu^{th} = (143\pm 42_{th}\pm 22_{exp})\times 10^{-11}$ which is
about 3$\sigma$ discrepancy between the SM predictions and experiment. 2. I
improve the estimate of QCD power corrections up to dimension D=12 and provide
a new estimate of the ones up to D=20 within the SVZ expansion by combining the
ratio of the Laplace sum rules (LSR) with the BNP $\tau$-like decay moments for
the I=1 vector current. The results in Table 1 confirm a violation of the
factorization of the four-quark condensates and the value of the gluon one $
<\alpha_s G^2>$ from some other sources. Up to D=20, I there is not any
factorial nor exponential growth of the size of these power corrections. 3. I
use these new values of power corrections to extract $\alpha_s$ from the BNP
lowest moment. To order $\alpha_s^4$, I find within the SVZ expansion:
$\alpha_s(M_\tau)= 0.3081(50)_{fit}(71)_{\alpha_s^5}$ [resp. $0.3260
(47)_{fit}(62)_{\alpha_s^5}]$ implying $\alpha_s(M_Z)= 0.1170(6)(3)_{evol}$
[resp. $0.1192(6)(3)_{evol}$] for Fixed Order (FO) [resp. Contour Improved
(CI)] PT series. They lead to the mean: $
\alpha_s(M_\tau)\vert_{SVZ}=0.3179(58)_{fit}(81)_{syst}$ and $
\alpha_s(M_Z)\vert_{SVZ}= 0.1182(12)(3)_{evol}$ where the systematic
error(syst) takes into account the discrepancy between FO and CI. Using the
lowest BNP moment, we also obtain from the vector (V) component of $\tau$-decay
the mean: $ \alpha_s(M_\tau)\vert_{\tau,V}=0.3219(52)(91)_{syst}$ giving:
$\alpha_s(M_Z)\vert_{\tau,V}=0.1187(13)(3)_{evol}$. The average of the two
determinations leads to: $ \alpha_s(M_\tau)=0.3198(72)$ and $\alpha_s(M_Z)=
0.1185(9)(3)_{evol}$. 4. Some contributions beyond the SVZ expansion ($1/Q^2$,
instantons and duality violation) expected to be small are discussed in
Sections 10,11.
| [
{
"created": "Wed, 21 Feb 2024 18:11:14 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Feb 2024 16:43:55 GMT",
"version": "v2"
},
{
"created": "Tue, 16 Apr 2024 13:56:55 GMT",
"version": "v3"
},
{
"created": "Thu, 18 Apr 2024 05:02:51 GMT",
"version": "v4"
},
{
"c... | 2024-04-26 | [
[
"Narison",
"Stephan",
"",
"LUPM CNRS/IN2P3, Univ. Montpellier, and iHEPMAD,\n Univ. Antananarivo - MG"
]
] | 1. I update my previous comparison of the theoretical value of the muon anomaly with the new measurement and found $\Delta a_\mu\equiv a_\mu^{exp}-a_\mu^{th} = (143\pm 42_{th}\pm 22_{exp})\times 10^{-11}$ which is about 3$\sigma$ discrepancy between the SM predictions and experiment. 2. I improve the estimate of QCD power corrections up to dimension D=12 and provide a new estimate of the ones up to D=20 within the SVZ expansion by combining the ratio of the Laplace sum rules (LSR) with the BNP $\tau$-like decay moments for the I=1 vector current. The results in Table 1 confirm a violation of the factorization of the four-quark condensates and the value of the gluon one $ <\alpha_s G^2>$ from some other sources. Up to D=20, I there is not any factorial nor exponential growth of the size of these power corrections. 3. I use these new values of power corrections to extract $\alpha_s$ from the BNP lowest moment. To order $\alpha_s^4$, I find within the SVZ expansion: $\alpha_s(M_\tau)= 0.3081(50)_{fit}(71)_{\alpha_s^5}$ [resp. $0.3260 (47)_{fit}(62)_{\alpha_s^5}]$ implying $\alpha_s(M_Z)= 0.1170(6)(3)_{evol}$ [resp. $0.1192(6)(3)_{evol}$] for Fixed Order (FO) [resp. Contour Improved (CI)] PT series. They lead to the mean: $ \alpha_s(M_\tau)\vert_{SVZ}=0.3179(58)_{fit}(81)_{syst}$ and $ \alpha_s(M_Z)\vert_{SVZ}= 0.1182(12)(3)_{evol}$ where the systematic error(syst) takes into account the discrepancy between FO and CI. Using the lowest BNP moment, we also obtain from the vector (V) component of $\tau$-decay the mean: $ \alpha_s(M_\tau)\vert_{\tau,V}=0.3219(52)(91)_{syst}$ giving: $\alpha_s(M_Z)\vert_{\tau,V}=0.1187(13)(3)_{evol}$. The average of the two determinations leads to: $ \alpha_s(M_\tau)=0.3198(72)$ and $\alpha_s(M_Z)= 0.1185(9)(3)_{evol}$. 4. Some contributions beyond the SVZ expansion ($1/Q^2$, instantons and duality violation) expected to be small are discussed in Sections 10,11. |
hep-ph/0008150 | Christof Wetterich | C. Wetterich | Spontaneously broken color | 67 pages | Phys.Rev. D64 (2001) 036003 | 10.1103/PhysRevD.64.036003 | HD-THEP-00-35 | hep-ph nucl-th | null | The vacuum of QCD is characterized by the Higgs mechanism. Color is
``spontaneously broken'' by a quark-antiquark condensate in the octet
representation. The massive gluons carry integer electric charges and are
identified with the vector mesons. The fermionic excitations consist of the low
mass baryon octet and a singlet. The interactions between these particles and
the light pseudoscalar octet are largely determined by chiral symmetry and a
nonlinear local symmetry. A consistent phenomenological picture of strong
interactions at long distances arises from a simple effective action.
| [
{
"created": "Tue, 15 Aug 2000 10:00:50 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Wetterich",
"C.",
""
]
] | The vacuum of QCD is characterized by the Higgs mechanism. Color is ``spontaneously broken'' by a quark-antiquark condensate in the octet representation. The massive gluons carry integer electric charges and are identified with the vector mesons. The fermionic excitations consist of the low mass baryon octet and a singlet. The interactions between these particles and the light pseudoscalar octet are largely determined by chiral symmetry and a nonlinear local symmetry. A consistent phenomenological picture of strong interactions at long distances arises from a simple effective action. |
1902.09266 | Ivo de Medeiros Varzielas | Ivo de Medeiros Varzielas and Stephen F. King | Origin of Yukawa couplings for Higgs and leptoquarks | 20 pages, 7 figures. v2: references added | Phys. Rev. D 99, 095029 (2019) | 10.1103/PhysRevD.99.095029 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a model in which the Yukawa couplings of Higgs doublets are
related to the couplings of the chiral fermions to a scalar leptoquark triplet.
This is due to their common origin via mixing with a vector-like family
distinguished by a discrete $Z_5$ symmetry, under which only the three chiral
families are neutral. The model predicts lepton non-universality in $B$ to $K$
decays, depending on the leptoquark mass, $V_{ts}$ and $m_\mu/m_\tau$. The
model can only consistently explain the anomalies in $R_{K^{(*)}}$ for a
leptoquark mass close to the collider lower bound of about $1~\text{TeV}$.
Constraints from $B_s - \bar{B}_s$ mixing and eventually $\tau \to \mu \gamma$
become relevant for low leptoquark masses and large couplings, while $\mu \to e
\gamma$ remains automatically under control due to the absence of leptoquark
couplings to the electron in this model.
| [
{
"created": "Thu, 21 Feb 2019 19:00:00 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Feb 2019 16:20:00 GMT",
"version": "v2"
}
] | 2019-05-29 | [
[
"Varzielas",
"Ivo de Medeiros",
""
],
[
"King",
"Stephen F.",
""
]
] | We propose a model in which the Yukawa couplings of Higgs doublets are related to the couplings of the chiral fermions to a scalar leptoquark triplet. This is due to their common origin via mixing with a vector-like family distinguished by a discrete $Z_5$ symmetry, under which only the three chiral families are neutral. The model predicts lepton non-universality in $B$ to $K$ decays, depending on the leptoquark mass, $V_{ts}$ and $m_\mu/m_\tau$. The model can only consistently explain the anomalies in $R_{K^{(*)}}$ for a leptoquark mass close to the collider lower bound of about $1~\text{TeV}$. Constraints from $B_s - \bar{B}_s$ mixing and eventually $\tau \to \mu \gamma$ become relevant for low leptoquark masses and large couplings, while $\mu \to e \gamma$ remains automatically under control due to the absence of leptoquark couplings to the electron in this model. |
0712.3782 | Ricardo Gaitan | J. L. Diaz-Cruz, R. Gaitan-Lozano, G. Lopez-Castro and C. E.
Pagliarone | CKM-suppressed top quark decays t -> q + W in the SM and beyond | 11 pages | Phys.Rev.D77:094010,2008 | 10.1103/PhysRevD.77.094010 | null | hep-ph | null | Top quark decays are of particular interest as a mean to test the standard
model (SM) predictions, both for dominant (t -> b + W) and rare decays (t -> q
+ W, cV, cVV, c phi^{0}, bWZ). As the latter are highly suppressed, they become
an excellent window to probe the predictions of thories beyond the SM. In
particular, we evaluate the corrections from new physics to the CKM-suppressed
SM top quark decay t -> q + W (q = d, s), both within the an effective model
with right-handed currents and the MSSM. We also discuss the perspectives to
probe those predictions at the ILC.
| [
{
"created": "Fri, 21 Dec 2007 19:44:02 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Diaz-Cruz",
"J. L.",
""
],
[
"Gaitan-Lozano",
"R.",
""
],
[
"Lopez-Castro",
"G.",
""
],
[
"Pagliarone",
"C. E.",
""
]
] | Top quark decays are of particular interest as a mean to test the standard model (SM) predictions, both for dominant (t -> b + W) and rare decays (t -> q + W, cV, cVV, c phi^{0}, bWZ). As the latter are highly suppressed, they become an excellent window to probe the predictions of thories beyond the SM. In particular, we evaluate the corrections from new physics to the CKM-suppressed SM top quark decay t -> q + W (q = d, s), both within the an effective model with right-handed currents and the MSSM. We also discuss the perspectives to probe those predictions at the ILC. |
1210.6239 | Ivo de Medeiros Varzielas | I. de Medeiros Varzielas, C. Hambrock, G. Hiller, M. Jung, P. Leser,
H. P\"as, S. Schacht, M. Aoki, J. Barry, G. Bhattacharyya, G. Blankenburg, A.
J. Buras, L. Calibbi, L. Covi, D. Das, F. F. Deppisch, S. Descotes-Genon,
G.-J. Ding, M. Duerr, T. Feldmann, M. Freytsis, J. Girrbach, F. Gonz\'alez
Canales, F. Hartmann, J. Heeck, J. C. Helo, M. Hirsch, C. M. Ho, M.
Holthausen, A. Kadosh, J. F. Kamenik, W. Kilian, S. F. King, P. Ko, S.
Kovalenko, M. B. Krauss, M. Kreps, J. Kubo, Z. Ligeti, P. O. Ludl, E. Ma, J.
Matias, A. Merle, A. Meroni, A. Mondrag\'on, M. Mondrag\'on, S. Morisi, S.
Nandi, Y. Omura, E. Peinado, F. Sala, U. Salda\~na Salazar, D. Schmidt, K.
Schnitter, H. Ser\^odio, C. Sim\~oes, M. Spinrath, H. Takano, M. Tanimoto, M.
T\'ortola, S. Turczyk, A. Vicente, J. Virto, Y.-M. Wang, T. Weiler, K.
Yamamoto, M. J. S. Yang, C. Yu, R. Zwicky | Proceedings of the 2nd Workshop on Flavor Symmetries and Consequences in
Accelerators and Cosmology (FLASY12) | Order 400 pages, several figures including the group picture v2:
corrected author list and contribution | null | null | DO-TH 12/33 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | These are the proceedings of the 2nd Workshop on Flavor Symmetries and
Consequences in Accelerators and Cosmology, held 30 June 2012 - 4 July 2012,
Dortmund, Germany.
| [
{
"created": "Tue, 23 Oct 2012 14:10:00 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Oct 2012 13:37:00 GMT",
"version": "v2"
}
] | 2012-10-26 | [
[
"Varzielas",
"I. de Medeiros",
""
],
[
"Hambrock",
"C.",
""
],
[
"Hiller",
"G.",
""
],
[
"Jung",
"M.",
""
],
[
"Leser",
"P.",
""
],
[
"Päs",
"H.",
""
],
[
"Schacht",
"S.",
""
],
[
"Aoki",
"M.",
... | These are the proceedings of the 2nd Workshop on Flavor Symmetries and Consequences in Accelerators and Cosmology, held 30 June 2012 - 4 July 2012, Dortmund, Germany. |
1709.05991 | Ralf-Arno Tripolt | Ralf-Arno Tripolt, Bernd-Jochen Schaefer, Lorenz von Smekal, Jochen
Wambach | The low-temperature behavior of the quark-meson model | 7 pages, 7 figures, v2 corresponds to published version | Phys. Rev. D 97, 034022 (2018) | 10.1103/PhysRevD.97.034022 | null | hep-ph hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We revisit the phase diagram of strong-interaction matter for the two-flavor
quark-meson model using the Functional Renormalization Group. In contrast to
standard mean-field calculations, an unusual phase structure is encountered at
low temperatures and large quark chemical potentials. In particular, we
identify a regime where the pressure decreases with increasing temperature and
discuss possible reasons for this unphysical behavior.
| [
{
"created": "Mon, 18 Sep 2017 15:03:53 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Feb 2018 10:37:12 GMT",
"version": "v2"
}
] | 2018-02-28 | [
[
"Tripolt",
"Ralf-Arno",
""
],
[
"Schaefer",
"Bernd-Jochen",
""
],
[
"von Smekal",
"Lorenz",
""
],
[
"Wambach",
"Jochen",
""
]
] | We revisit the phase diagram of strong-interaction matter for the two-flavor quark-meson model using the Functional Renormalization Group. In contrast to standard mean-field calculations, an unusual phase structure is encountered at low temperatures and large quark chemical potentials. In particular, we identify a regime where the pressure decreases with increasing temperature and discuss possible reasons for this unphysical behavior. |
1205.3769 | Jiang-Hao Yu | Qing-Hong Cao, Zhao Li, Jiang-Hao Yu, C.-P. Yuan | Discovery and Identification of W' and Z' in SU(2) x SU(2) x U(1) Models
at the LHC | 29 pages, including 11 figures, 3 tables, added references for
introduction | Phys. Rev. D 86, 095010 (2012) | 10.1103/PhysRevD.86.095010 | MSUHEP-110802 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore the discovery potential of W' and Z' boson searches for various
SU(2) x SU(2) x U(1) models at the Large Hadron Collider (LHC), after taking
into account the constraints from low energy precision measurements and direct
searches at both the Tevatron (1.96 TeV) and the LHC (7 TeV). In such models,
the W' and Z' bosons emerge after the electroweak symmetry is spontaneously
broken. Two patterns of the symmetry breaking are considered in this work: one
is SU(2)_L x SU(2)_2 x U(1)_X to SU(2)_L x U(1)_Y (BP-I), another is SU(2)_1 x
SU(2)_2 x U(1)_Y to SU(2)_L x U(1)_Y (BP-II). Examining the single production
channel of W' and Z' with their subsequent leptonic decays, we find that the
probability of detecting W' and Z' bosons in the considered models at the LHC
(with 14 TeV) is highly limited by the low energy precision data constraints.
We show that observing Z' alone, without seeing a W', does not rule out new
physics models with non-Abelian gauge extension, such as the phobic models in
BP-I. Models in BP-II would predict the discovery of degenerate W' and Z'
bosons at the LHC.
| [
{
"created": "Wed, 16 May 2012 19:23:35 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Jul 2012 20:01:17 GMT",
"version": "v2"
}
] | 2012-11-14 | [
[
"Cao",
"Qing-Hong",
""
],
[
"Li",
"Zhao",
""
],
[
"Yu",
"Jiang-Hao",
""
],
[
"Yuan",
"C. -P.",
""
]
] | We explore the discovery potential of W' and Z' boson searches for various SU(2) x SU(2) x U(1) models at the Large Hadron Collider (LHC), after taking into account the constraints from low energy precision measurements and direct searches at both the Tevatron (1.96 TeV) and the LHC (7 TeV). In such models, the W' and Z' bosons emerge after the electroweak symmetry is spontaneously broken. Two patterns of the symmetry breaking are considered in this work: one is SU(2)_L x SU(2)_2 x U(1)_X to SU(2)_L x U(1)_Y (BP-I), another is SU(2)_1 x SU(2)_2 x U(1)_Y to SU(2)_L x U(1)_Y (BP-II). Examining the single production channel of W' and Z' with their subsequent leptonic decays, we find that the probability of detecting W' and Z' bosons in the considered models at the LHC (with 14 TeV) is highly limited by the low energy precision data constraints. We show that observing Z' alone, without seeing a W', does not rule out new physics models with non-Abelian gauge extension, such as the phobic models in BP-I. Models in BP-II would predict the discovery of degenerate W' and Z' bosons at the LHC. |
hep-ph/0403197 | Stefan Braunewell | Stefan Braunewell, Carlo Ewerz | The Perturbative Odderon in Quasidiffractive Photon-Photon Scattering | 27 pages, 9 figures | Phys.Rev.D70:014021,2004 | 10.1103/PhysRevD.70.014021 | HD-THEP-04-09 | hep-ph | null | We study the perturbative Odderon in the quasidiffractive process gamma(*)
gamma(*) to eta_c eta_c. At high energies this process is dominated by Odderon
exchange and can be viewed as the theoretically cleanest test of the
perturbative Odderon. We calculate the differential and total cross section, as
well as the dependence on the energy and on the photon virtualities taking into
account the effects of resummation of logarithms of the energy. The results are
compared with those obtained with a simple exchange of three noninteracting
gluons. We present the expected cross section for this process at a future
Linear Collider and discuss implications for other processes involving the
perturbative Odderon.
| [
{
"created": "Wed, 17 Mar 2004 20:36:30 GMT",
"version": "v1"
}
] | 2011-07-19 | [
[
"Braunewell",
"Stefan",
""
],
[
"Ewerz",
"Carlo",
""
]
] | We study the perturbative Odderon in the quasidiffractive process gamma(*) gamma(*) to eta_c eta_c. At high energies this process is dominated by Odderon exchange and can be viewed as the theoretically cleanest test of the perturbative Odderon. We calculate the differential and total cross section, as well as the dependence on the energy and on the photon virtualities taking into account the effects of resummation of logarithms of the energy. The results are compared with those obtained with a simple exchange of three noninteracting gluons. We present the expected cross section for this process at a future Linear Collider and discuss implications for other processes involving the perturbative Odderon. |
1505.07584 | Ismail Turan | Soner Albayrak and Ismail Turan (METU, Ankara) | CPT-odd Photon in Vacuum-Orthogonal Model | 21 pages, 6 tables, some clarifications in the text | null | null | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Lorentz and CPT violation in the photon sector with the operators of
arbitrary mass dimension has been proposed in the context of Standard-Model
Extension. The CPT-odd subset of this enlarged model is investigated from a
quantum-field theoretical point of view. The generic forms of dispersion
relations, polarization vectors and the propagators are obtained for this
special subset. Particularly, the general vacuum-orthogonal model is analyzed
and it is demonstrated that the vacuum orthogonal model remains vacuum
orthogonal at all orders. Although the model has birefringent solutions, they
are shown to be spurious. Furthermore, the relevant polarization vectors are
shown to be conventional. Leading order model is explicitly analyzed and it is
demonstrated that there exists a nontrivial coefficient space satisfying above
properties.
| [
{
"created": "Thu, 28 May 2015 08:11:01 GMT",
"version": "v1"
},
{
"created": "Wed, 3 Aug 2016 13:38:50 GMT",
"version": "v2"
}
] | 2016-08-04 | [
[
"Albayrak",
"Soner",
"",
"METU, Ankara"
],
[
"Turan",
"Ismail",
"",
"METU, Ankara"
]
] | Lorentz and CPT violation in the photon sector with the operators of arbitrary mass dimension has been proposed in the context of Standard-Model Extension. The CPT-odd subset of this enlarged model is investigated from a quantum-field theoretical point of view. The generic forms of dispersion relations, polarization vectors and the propagators are obtained for this special subset. Particularly, the general vacuum-orthogonal model is analyzed and it is demonstrated that the vacuum orthogonal model remains vacuum orthogonal at all orders. Although the model has birefringent solutions, they are shown to be spurious. Furthermore, the relevant polarization vectors are shown to be conventional. Leading order model is explicitly analyzed and it is demonstrated that there exists a nontrivial coefficient space satisfying above properties. |
1402.5372 | Michael Eides | Michael I. Eides and Valery A. Shelyuto | Muon Loop Light-by-Light Contribution to Hyperfine Splitting in Muonium | 6 pages, 1 figure | Phys. Rev. Lett. 112, 173004 (2014) | 10.1103/PhysRevLett.112.173004 | UK/14-01 | hep-ph physics.atom-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Three-loop corrections to hyperfine splitting in muonium generated by the
gauge invariant sets of diagrams with muon and tauon loop light-by-light
scattering blocks are calculated. These results complete calculations of all
light-by-light scattering contributions to hyperfine splitting in muonium.
| [
{
"created": "Fri, 21 Feb 2014 17:57:55 GMT",
"version": "v1"
}
] | 2014-05-07 | [
[
"Eides",
"Michael I.",
""
],
[
"Shelyuto",
"Valery A.",
""
]
] | Three-loop corrections to hyperfine splitting in muonium generated by the gauge invariant sets of diagrams with muon and tauon loop light-by-light scattering blocks are calculated. These results complete calculations of all light-by-light scattering contributions to hyperfine splitting in muonium. |
1508.07413 | Sannino Francesco | Francesco Sannino | Large N Scalars: From Glueballs to Dynamical Higgs Models | 15 pages ReVTeX, 3 figures | Phys. Rev. D 93, 105011 (2016) | 10.1103/PhysRevD.93.105011 | CP3-Origins-2015-35 DNRF90, DIAS-2015-35 | hep-ph hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct effective Lagrangians, and corresponding counting schemes, valid
to describe the dynamics of the lowest lying large N stable massive composite
state emerging in strongly coupled theories. The large N counting rules can now
be employed when computing quantum corrections via an effective Lagrangian
description. The framework allows for systematic investigations of composite
dynamics of non-Goldstone nature. Relevant examples are the lightest glueball
states emerging in any Yang-Mills theory. We further apply the effective
approach and associated counting scheme to composite models at the electroweak
scale. To illustrate the formalism we consider the possibility that the Higgs
emerges as: the lightest glueball of a new composite theory; the large N scalar
meson in models of dynamical electroweak symmetry breaking; the large N
pseudodilaton useful also for models of near-conformal dynamics. For each of
these realisations we determine the leading N corrections to the electroweak
precision parameters. The results nicely elucidate the underlying large N
dynamics and can be used to confront first principle lattice results featuring
composite scalars with a systematic effective approach.
| [
{
"created": "Sat, 29 Aug 2015 06:52:30 GMT",
"version": "v1"
}
] | 2016-05-18 | [
[
"Sannino",
"Francesco",
""
]
] | We construct effective Lagrangians, and corresponding counting schemes, valid to describe the dynamics of the lowest lying large N stable massive composite state emerging in strongly coupled theories. The large N counting rules can now be employed when computing quantum corrections via an effective Lagrangian description. The framework allows for systematic investigations of composite dynamics of non-Goldstone nature. Relevant examples are the lightest glueball states emerging in any Yang-Mills theory. We further apply the effective approach and associated counting scheme to composite models at the electroweak scale. To illustrate the formalism we consider the possibility that the Higgs emerges as: the lightest glueball of a new composite theory; the large N scalar meson in models of dynamical electroweak symmetry breaking; the large N pseudodilaton useful also for models of near-conformal dynamics. For each of these realisations we determine the leading N corrections to the electroweak precision parameters. The results nicely elucidate the underlying large N dynamics and can be used to confront first principle lattice results featuring composite scalars with a systematic effective approach. |
1610.09924 | Avirup Shaw | Anindya Datta (University of Calcutta) and Avirup Shaw (Indian
Association for the Cultivation of Science) | Effects of non-minimal Universal Extra Dimension on $B\rightarrow
X_s\gamma$ | Typos corrected, published version | Phys. Rev. D 95, 015033 (2017) | 10.1103/PhysRevD.95.015033 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We estimate contributions from Kaluza-Klein excitations of third generation
quarks and gauge bosons to the branching ratio of $B\rightarrow X_s\gamma$
decay process in 5-Dimensional Universal Extra Dimensional scenario with
non-vanishing boundary localised terms. This model is conventionally known as
non-minimal Universal Extra Dimensional model. We have derived the lower limit
on the size of the extra dimension by comparing our theoretical estimation of
the branching ratio which includes next-to-next-to leading order QCD
corrections with its experimentally measured value. Coefficients of the
boundary localised terms have also been constrained. 95 \% C.L. lower limit on
inverse of radius of compactification ($R^{-1}$) can be as large as 670 GeV for
some choice of the value of coefficients of boundary localised terms.
| [
{
"created": "Mon, 31 Oct 2016 13:52:07 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Feb 2017 08:16:03 GMT",
"version": "v2"
}
] | 2017-02-03 | [
[
"Datta",
"Anindya",
"",
"University of Calcutta"
],
[
"Shaw",
"Avirup",
"",
"Indian\n Association for the Cultivation of Science"
]
] | We estimate contributions from Kaluza-Klein excitations of third generation quarks and gauge bosons to the branching ratio of $B\rightarrow X_s\gamma$ decay process in 5-Dimensional Universal Extra Dimensional scenario with non-vanishing boundary localised terms. This model is conventionally known as non-minimal Universal Extra Dimensional model. We have derived the lower limit on the size of the extra dimension by comparing our theoretical estimation of the branching ratio which includes next-to-next-to leading order QCD corrections with its experimentally measured value. Coefficients of the boundary localised terms have also been constrained. 95 \% C.L. lower limit on inverse of radius of compactification ($R^{-1}$) can be as large as 670 GeV for some choice of the value of coefficients of boundary localised terms. |
hep-ph/9912508 | Kevin E. Cahill | Kevin Cahill | B-L Neutrinos | 13 pages, 2 figures; CP phase fixed; new figure | null | null | null | hep-ph | null | Neutrino masses and mixings are analyzed in terms of left-handed fields and a
6x6 complex symmetric mass matrix whose singular values are the neutrino
masses. An angle theta_nu characterizes the kind of the neutrinos, with
theta_nu=0 for Dirac neutrinos and theta_nu=pi/2 for Majorana neutrinos. At
theta_nu = 0 baryon-minus-lepton number is conserved. If theta_nu is
approximately zero, the six neutrino masses coalesce into three nearly
degenerate pairs. Thus the tiny mass differences exhibited in the solar and
atmospheric neutrino experiments are naturally explained by the approximate
conservation of B-L. Neutrinos are nearly Dirac fermions.
This B-L model leads to these predictions: neutrinos oscillate mainly between
flavor eigenfields and sterile eigenfields, and so the appearance of neutrinos
and antineutrinos is suppressed; neutrinos may well be of cosmological
importance; in principle the disappearance of the tau neutrino should be
observable; and neutrinoless double-beta decay is suppressed by an extra factor
of 10^(-5) and so will not be seen in the Heidelberg/Moscow, IGEX, GENIUS, or
CUORE experiments.
| [
{
"created": "Sun, 26 Dec 1999 12:19:27 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Jan 2000 07:11:32 GMT",
"version": "v2"
},
{
"created": "Mon, 19 Jun 2000 23:40:26 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Cahill",
"Kevin",
""
]
] | Neutrino masses and mixings are analyzed in terms of left-handed fields and a 6x6 complex symmetric mass matrix whose singular values are the neutrino masses. An angle theta_nu characterizes the kind of the neutrinos, with theta_nu=0 for Dirac neutrinos and theta_nu=pi/2 for Majorana neutrinos. At theta_nu = 0 baryon-minus-lepton number is conserved. If theta_nu is approximately zero, the six neutrino masses coalesce into three nearly degenerate pairs. Thus the tiny mass differences exhibited in the solar and atmospheric neutrino experiments are naturally explained by the approximate conservation of B-L. Neutrinos are nearly Dirac fermions. This B-L model leads to these predictions: neutrinos oscillate mainly between flavor eigenfields and sterile eigenfields, and so the appearance of neutrinos and antineutrinos is suppressed; neutrinos may well be of cosmological importance; in principle the disappearance of the tau neutrino should be observable; and neutrinoless double-beta decay is suppressed by an extra factor of 10^(-5) and so will not be seen in the Heidelberg/Moscow, IGEX, GENIUS, or CUORE experiments. |
1501.07370 | Martin Beneke | M. Beneke (TU Munich) | Unstable-particle effective field theory | 14 pages, LaTeX, 12 figures, to appear in Nucl. Phys. (Proc. Suppl.)
,"Advances in Computational Particle Physics", Proceedings of the Final
Meeting of the Collaborative Research Centre / Transregio 9 "Computational
Particle Physics", Durbach, Germany, September 2014 | null | null | TUM-HEP 975/15, SFB/CPP-14-118 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Unstable particles are notorious in perturbative quantum field theory for
producing singular propagators in scattering amplitudes that require
regularization by the finite width. In this review I discuss the construction
of an effective field theory for unstable particles, based on the hierarchy of
scales between the mass, M, and the width,Gamma, of the unstable particle that
allows resonant processes to be systematically expanded in powers of the
coupling alpha and Gamma/M, thereby providing gauge-invariant approximations at
every order. I illustrate the method with the next-to-leading order line-shape
of a scalar resonance in an abelian gauge-Yukawa model, and results on NLO and
dominant NNLO corrections to (resonant and non-resonant) pair production of
W-bosons and top quarks.
| [
{
"created": "Thu, 29 Jan 2015 08:12:18 GMT",
"version": "v1"
}
] | 2015-01-30 | [
[
"Beneke",
"M.",
"",
"TU Munich"
]
] | Unstable particles are notorious in perturbative quantum field theory for producing singular propagators in scattering amplitudes that require regularization by the finite width. In this review I discuss the construction of an effective field theory for unstable particles, based on the hierarchy of scales between the mass, M, and the width,Gamma, of the unstable particle that allows resonant processes to be systematically expanded in powers of the coupling alpha and Gamma/M, thereby providing gauge-invariant approximations at every order. I illustrate the method with the next-to-leading order line-shape of a scalar resonance in an abelian gauge-Yukawa model, and results on NLO and dominant NNLO corrections to (resonant and non-resonant) pair production of W-bosons and top quarks. |
hep-ph/0611030 | Werner Rodejohann | Kathrin A. Hochmuth, Werner Rodejohann | On Symmetric Lepton Mixing Matrices | 9 pages, 1 figure. Comments added, to appear in PLB | Phys.Lett.B644:147-152,2007 | 10.1016/j.physletb.2006.11.042 | MPP-2006-140 | hep-ph | null | Contrary to the quark mixing matrix, the lepton mixing matrix could be
symmetric. We study the phenomenological consequences of this possibility. In
particular, we find that symmetry would imply that |U_{e3}| is larger than
0.16, i.e., above its current 2 sigma limit. The other mixing angles are also
constrained and CP violating effects in neutrino oscillations are suppressed,
even though |U_{e3}| is sizable. Maximal atmospheric mixing is only allowed if
the other observables are outside their current 3 sigma ranges, and sin^2
theta_{23} lies typically below 0.5. The Majorana phases are not affected, but
the implied values of the solar neutrino mixing angle have some effect on the
predictions for neutrinoless double beta decay. We further discuss some formal
properties of a symmetric mixing matrix.
| [
{
"created": "Thu, 2 Nov 2006 16:47:55 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Nov 2006 12:07:31 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Hochmuth",
"Kathrin A.",
""
],
[
"Rodejohann",
"Werner",
""
]
] | Contrary to the quark mixing matrix, the lepton mixing matrix could be symmetric. We study the phenomenological consequences of this possibility. In particular, we find that symmetry would imply that |U_{e3}| is larger than 0.16, i.e., above its current 2 sigma limit. The other mixing angles are also constrained and CP violating effects in neutrino oscillations are suppressed, even though |U_{e3}| is sizable. Maximal atmospheric mixing is only allowed if the other observables are outside their current 3 sigma ranges, and sin^2 theta_{23} lies typically below 0.5. The Majorana phases are not affected, but the implied values of the solar neutrino mixing angle have some effect on the predictions for neutrinoless double beta decay. We further discuss some formal properties of a symmetric mixing matrix. |
1711.00102 | Diogo Buarque Franzosi | Diogo Buarque Franzosi, Federica Fabbri, Steffen Schumann | Constraining scalar resonances with top-quark pair production at the LHC | 34 pages, 17 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Constraints on models which predict resonant top-quark pair production at the
LHC are provided via a reinterpretation of the Standard Model (SM) particle
level measurement of the top-anti-top invariant mass distribution,
$m(t\bar{t})$. We make use of state-of-the-art Monte Carlo event simulation to
perform a direct comparison with measurements of $m(t\bar{t})$ in the
semi-leptonic channels, considering both the boosted and the resolved regime of
the hadronic top decays. A simplified model to describe various scalar
resonances decaying into top-quarks is considered, including CP-even and
CP-odd, color-singlet and color-octet states, and the excluded regions in the
respective parameter spaces are provided.
| [
{
"created": "Tue, 31 Oct 2017 20:43:32 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Feb 2018 09:51:51 GMT",
"version": "v2"
}
] | 2018-02-28 | [
[
"Franzosi",
"Diogo Buarque",
""
],
[
"Fabbri",
"Federica",
""
],
[
"Schumann",
"Steffen",
""
]
] | Constraints on models which predict resonant top-quark pair production at the LHC are provided via a reinterpretation of the Standard Model (SM) particle level measurement of the top-anti-top invariant mass distribution, $m(t\bar{t})$. We make use of state-of-the-art Monte Carlo event simulation to perform a direct comparison with measurements of $m(t\bar{t})$ in the semi-leptonic channels, considering both the boosted and the resolved regime of the hadronic top decays. A simplified model to describe various scalar resonances decaying into top-quarks is considered, including CP-even and CP-odd, color-singlet and color-octet states, and the excluded regions in the respective parameter spaces are provided. |
2006.14596 | Arsenii Titov | Mikael Chala and Arsenii Titov | One-loop running of dimension-six Higgs-neutrino operators and
implications of a large neutrino dipole moment | 27 pages, 7 figures, 2 tables, 1 matrix; Feynman diagrams made nicer;
typos corrected; matches version published in JHEP | JHEP 09 (2020) 188 | 10.1007/JHEP09(2020)188 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute the one-loop running of the dimension-six CP-even Higgs operators
in the Standard Model effective field theory involving the right-handed
component of the would-be Dirac neutrinos. We discuss the implications of a
large Dirac neutrino magnetic dipole moment. In particular, we demonstrate that
a neutrino magnetic moment explaining the recent XENON1T excess induces Higgs
and $Z$ invisible decays with branching ratios in the range $[10^{-18},
10^{-12}]$. These numbers are unfortunately beyond the reach of current and
near future facilities.
| [
{
"created": "Thu, 25 Jun 2020 17:41:35 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Sep 2020 21:59:43 GMT",
"version": "v2"
}
] | 2020-10-02 | [
[
"Chala",
"Mikael",
""
],
[
"Titov",
"Arsenii",
""
]
] | We compute the one-loop running of the dimension-six CP-even Higgs operators in the Standard Model effective field theory involving the right-handed component of the would-be Dirac neutrinos. We discuss the implications of a large Dirac neutrino magnetic dipole moment. In particular, we demonstrate that a neutrino magnetic moment explaining the recent XENON1T excess induces Higgs and $Z$ invisible decays with branching ratios in the range $[10^{-18}, 10^{-12}]$. These numbers are unfortunately beyond the reach of current and near future facilities. |
hep-ph/9704369 | Yuri Kovchegov | Yuri V. Kovchegov, A.H. Mueller (Columbia University), Samuel Wallon
(Universitat Hamburg) | Unitarity Corrections and High Field Strengths in High Energy Hard
Collisions | 16 pages, LaTeX, 1 figure | Nucl.Phys. B507 (1997) 367-378 | 10.1016/S0550-3213(97)00567-1 | CU-TP-825, DESY 97-072 | hep-ph | null | Unitarity corrections to the BFKL description of high energy hard scattering
are viewed in large $N_c$ QCD in light-cone quantization. In a center of mass
frame unitarity corrections to high energy hard scattering are manifestly
perturbatively calculable and unrelated to questions of parton saturation. In a
frame where one of the hadrons is initially at rest unitarity corrections are
related to parton saturation effects and involve potential strengths $A_\mu
\sim 1/g.$ In such a frame we describe the high energy scattering in terms of
the expectation value of a Wilson loop. The large potentials $A_\mu \sim 1/g$
are shown to be pure gauge terms allowing perturbation theory to again describe
unitarity corrections and parton saturation effects. Genuine nonperturbative
effects only come in at energies well beyond those energies where unitarity
constraints first become important.
| [
{
"created": "Mon, 21 Apr 1997 17:39:46 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Kovchegov",
"Yuri V.",
"",
"Columbia University"
],
[
"Mueller",
"A. H.",
"",
"Columbia University"
],
[
"Wallon",
"Samuel",
"",
"Universitat Hamburg"
]
] | Unitarity corrections to the BFKL description of high energy hard scattering are viewed in large $N_c$ QCD in light-cone quantization. In a center of mass frame unitarity corrections to high energy hard scattering are manifestly perturbatively calculable and unrelated to questions of parton saturation. In a frame where one of the hadrons is initially at rest unitarity corrections are related to parton saturation effects and involve potential strengths $A_\mu \sim 1/g.$ In such a frame we describe the high energy scattering in terms of the expectation value of a Wilson loop. The large potentials $A_\mu \sim 1/g$ are shown to be pure gauge terms allowing perturbation theory to again describe unitarity corrections and parton saturation effects. Genuine nonperturbative effects only come in at energies well beyond those energies where unitarity constraints first become important. |
2009.11798 | Stefano Carrazza | Stefano Carrazza, Juan M. Cruz-Martinez, Christopher Schwan | Constructing PineAPPL grids on hardware accelerators | 5 pages, 2 figures, LHCP2020 proceedings | null | null | null | hep-ph hep-ex physics.comp-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this proceedings we demonstrate how to implement and construct the
PineAPPL grids, designed for fast-interpolation of Monte Carlo simulation with
electroweak and QCD corrections, using the VegasFlow framework for Monte Carlo
simulation on hardware accelerators. We provide an example of synchronous and
asynchronous filling operations of PineAPPL grids from Monte Carlo events
generated by VegasFlow. We compare the performance of this procedure on
multithreading CPU and GPU.
| [
{
"created": "Thu, 24 Sep 2020 16:39:30 GMT",
"version": "v1"
}
] | 2020-09-25 | [
[
"Carrazza",
"Stefano",
""
],
[
"Cruz-Martinez",
"Juan M.",
""
],
[
"Schwan",
"Christopher",
""
]
] | In this proceedings we demonstrate how to implement and construct the PineAPPL grids, designed for fast-interpolation of Monte Carlo simulation with electroweak and QCD corrections, using the VegasFlow framework for Monte Carlo simulation on hardware accelerators. We provide an example of synchronous and asynchronous filling operations of PineAPPL grids from Monte Carlo events generated by VegasFlow. We compare the performance of this procedure on multithreading CPU and GPU. |
1001.1978 | Guy F. de T\'eramond | Stanley J. Brodsky and Guy de Teramond | AdS/QCD and Light Front Holography: A New Approximation to QCD | Invited talk, presented by SJB at the Fifth International Conference
On Quarks and Nuclear Physics (QNP09), 21-26 Sep 2009, Beijing, China. Figure
updated | Chin.Phys.C34:1-8,2010 | null | SLAC-PUB-13876 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The combination of Anti-de Sitter space (AdS) methods with light-front
holography leads to a semi-classical first approximation to the spectrum and
wavefunctions of meson and baryon light-quark bound states. Starting from the
bound-state Hamiltonian equation of motion in QCD, we derive relativistic
light-front wave equations in terms of an invariant impact variable zeta which
measures the separation of the quark and gluonic constituents within the hadron
at equal light-front time. These equations of motion in physical space-time are
equivalent to the equations of motion which describe the propagation of spin-J
modes in anti--de Sitter (AdS) space. Its eigenvalues give the hadronic
spectrum, and its eigenmodes represent the probability distributions of the
hadronic constituents at a given scale. Applications to the light meson and
baryon spectra are presented. The predicted meson spectrum has a string-theory
Regge form ${\cal M}^2 = 4 \kappa^2(n+L+S/2)$; i.e., the square of the
eigenmass is linear in both L and n, where n counts the number of nodes of the
wavefunction in the radial variable zeta. The space-like pion and nucleon form
factors are also well reproduced. One thus obtains a remarkable connection
between the description of hadronic modes in AdS space and the Hamiltonian
formulation of QCD in physical space-time quantized on the light-front at fixed
light-front time. The model can be systematically improved by using its
complete orthonormal solutions to diagonalize the full QCD light-front
Hamiltonian or by applying the Lippmann-Schwinger method in order to
systematically include the QCD interaction terms.
| [
{
"created": "Tue, 12 Jan 2010 18:47:12 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Jul 2010 23:52:51 GMT",
"version": "v2"
}
] | 2014-11-20 | [
[
"Brodsky",
"Stanley J.",
""
],
[
"de Teramond",
"Guy",
""
]
] | The combination of Anti-de Sitter space (AdS) methods with light-front holography leads to a semi-classical first approximation to the spectrum and wavefunctions of meson and baryon light-quark bound states. Starting from the bound-state Hamiltonian equation of motion in QCD, we derive relativistic light-front wave equations in terms of an invariant impact variable zeta which measures the separation of the quark and gluonic constituents within the hadron at equal light-front time. These equations of motion in physical space-time are equivalent to the equations of motion which describe the propagation of spin-J modes in anti--de Sitter (AdS) space. Its eigenvalues give the hadronic spectrum, and its eigenmodes represent the probability distributions of the hadronic constituents at a given scale. Applications to the light meson and baryon spectra are presented. The predicted meson spectrum has a string-theory Regge form ${\cal M}^2 = 4 \kappa^2(n+L+S/2)$; i.e., the square of the eigenmass is linear in both L and n, where n counts the number of nodes of the wavefunction in the radial variable zeta. The space-like pion and nucleon form factors are also well reproduced. One thus obtains a remarkable connection between the description of hadronic modes in AdS space and the Hamiltonian formulation of QCD in physical space-time quantized on the light-front at fixed light-front time. The model can be systematically improved by using its complete orthonormal solutions to diagonalize the full QCD light-front Hamiltonian or by applying the Lippmann-Schwinger method in order to systematically include the QCD interaction terms. |
1905.04195 | Soumya Sadhukhan | Akanksha Bhardwaj, Partha Konar, Tanumoy Mandal and Soumya Sadhukhan | Probing the inert doublet model using jet substructure with a
multivariate analysis | 21 pages, 11 figures, Text updated, Figure added, matches published
PRD version | Phys. Rev. D 100, 055040 (2019) | 10.1103/PhysRevD.100.055040 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore the challenging but phenomenologically interesting hierarchical
mass spectrum of the Inert Doublet Model where relatively light dark matter
along with much heavier scalar states can fully satisfy the constraints on the
relic abundance and also fulfill other theoretical as well as collider and
astrophysical bounds. To probe this region of parameter space at the LHC, we
propose a signal process that combines up to two large radius boosted jets
along with substantial missing transverse momentum. Aided by our intuitive
signal selection, we capture a hybrid process where the di-fatjet signal is
significantly enhanced by the mono-fatjet contribution with minimal effects on
the SM di-fatjet background. Substantiated by the sizable mass difference
between the scalars, these boosted jets, originally produced from the hadronic
decay of massive vector bosons, still carry the inherent footprint of their
root. These features implanted inside the jet substructure can provide
additional handles to deal with a large background involving QCD jets. We adopt
a multivariate analysis using boosted decision tree to provide a robust
mechanism to explore the hierarchical scenario, which would bring almost the
entire available parameter space well within reach of the 14 TeV LHC runs with
high luminosity.
| [
{
"created": "Fri, 10 May 2019 14:32:46 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Oct 2019 08:00:46 GMT",
"version": "v2"
}
] | 2019-10-16 | [
[
"Bhardwaj",
"Akanksha",
""
],
[
"Konar",
"Partha",
""
],
[
"Mandal",
"Tanumoy",
""
],
[
"Sadhukhan",
"Soumya",
""
]
] | We explore the challenging but phenomenologically interesting hierarchical mass spectrum of the Inert Doublet Model where relatively light dark matter along with much heavier scalar states can fully satisfy the constraints on the relic abundance and also fulfill other theoretical as well as collider and astrophysical bounds. To probe this region of parameter space at the LHC, we propose a signal process that combines up to two large radius boosted jets along with substantial missing transverse momentum. Aided by our intuitive signal selection, we capture a hybrid process where the di-fatjet signal is significantly enhanced by the mono-fatjet contribution with minimal effects on the SM di-fatjet background. Substantiated by the sizable mass difference between the scalars, these boosted jets, originally produced from the hadronic decay of massive vector bosons, still carry the inherent footprint of their root. These features implanted inside the jet substructure can provide additional handles to deal with a large background involving QCD jets. We adopt a multivariate analysis using boosted decision tree to provide a robust mechanism to explore the hierarchical scenario, which would bring almost the entire available parameter space well within reach of the 14 TeV LHC runs with high luminosity. |
1504.02606 | Zi-qiang Zhang | Zi-qiang Zhang, Yan Wu, De-fu Hou | Melting temperature of heavy quarkonium with a holographic potential up
to sub-leading order | 4 pages, 1 figure | Chinese Physics C Vol. 40, No. 6 (2016) 064101 | 10.1088/1674-1137/40/6/064101 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A calculation of the melting temperatures of heavy quarkonium states with the
holographic potential was introduced in a previous work. In this paper, we
consider the holographic potential at sub-leading order, which permits finite
coupling corrections to be taken into account. It is found that this correction
lowers the dissociation temperatures of heavy quarkonium.
| [
{
"created": "Fri, 10 Apr 2015 09:34:29 GMT",
"version": "v1"
},
{
"created": "Thu, 31 Dec 2015 12:42:23 GMT",
"version": "v2"
}
] | 2016-07-15 | [
[
"Zhang",
"Zi-qiang",
""
],
[
"Wu",
"Yan",
""
],
[
"Hou",
"De-fu",
""
]
] | A calculation of the melting temperatures of heavy quarkonium states with the holographic potential was introduced in a previous work. In this paper, we consider the holographic potential at sub-leading order, which permits finite coupling corrections to be taken into account. It is found that this correction lowers the dissociation temperatures of heavy quarkonium. |
hep-ph/0106006 | Simone Pacetti | R. Baldini, E. Pasqualucci (INFN Laboratori Nazionali Frascati), S.
Dubni\v{c}ka (Ist. of Physics of Bratislava), P. Gauzzi (U. and INFN of Roma)
S. Pacetti (U. and INFN of Perugia), Y. Srivastava (U. and INFN of Perugia,
Northeastern U. of Boston) | The Inverse Problem: Extracting Time-Like from Space-Like Data | 4 pages, 8 figures, e^+e^- Physics at Intermediate Energies Workshop
- Contribution T20 | eConf C010430:T20,2001 | null | null | hep-ph | null | A practical strategy is presented and successfully implemented to determine
form factors in the time-like but unphysical (below threshold) region using
dispersion relations, in a model independent way without any bias towards
expected resonances. Space and time-like data have been employed along with a
regularization scheme to unfold and solve the integral equations. Remarkably,
resonance structures with peaks for the $\rho(770)$, $\rho'(1600)$ and a
structure near the $N\bar N$ threshold are automatically generated. The $\Phi$
peak is invisible thus refuting suggestions about any sizeable $s\bar s$
content in the nucleon.
| [
{
"created": "Fri, 1 Jun 2001 09:17:46 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Baldini",
"R.",
"",
"INFN Laboratori Nazionali Frascati"
],
[
"Pasqualucci",
"E.",
"",
"INFN Laboratori Nazionali Frascati"
],
[
"Dubnička",
"S.",
"",
"Ist. of Physics of Bratislava"
],
[
"Gauzzi",
"P.",
"",
"U. and INFN of Roma"
],
... | A practical strategy is presented and successfully implemented to determine form factors in the time-like but unphysical (below threshold) region using dispersion relations, in a model independent way without any bias towards expected resonances. Space and time-like data have been employed along with a regularization scheme to unfold and solve the integral equations. Remarkably, resonance structures with peaks for the $\rho(770)$, $\rho'(1600)$ and a structure near the $N\bar N$ threshold are automatically generated. The $\Phi$ peak is invisible thus refuting suggestions about any sizeable $s\bar s$ content in the nucleon. |
hep-ph/9803266 | U. Meissner | Nadia Fettes, Ulf-G. Mei{\ss}ner and Sven Steininger | Pion-nucleon scattering in chiral perturbation theory I:
Isospin-symmetric case | 38 pp, LaTeX, uses epsf, 7 figs, additional remarks, one figure
added, version to be published in Nucl.Phys.A | Nucl.Phys. A640 (1998) 199-234 | 10.1016/S0375-9474(98)00452-7 | FZJ-IKP(TH)-1998-03 | hep-ph nucl-th | null | We construct the complete effective chiral pion-nucleon Lagrangian to third
order in small momenta based on relativistic chiral perturbation theory. We
then perform the so-called heavy baryon limit and construct all terms
up-to-and-including order $1/m^2$ with fixed and free coefficients. As an
application, we discuss in detail pion-nucleon scattering. In particular, we
show that the $1/m$ expansion of the Born graphs calculated relativistically
can be recovered exactly in the heavy baryon approach without any additional
momentum-dependent wave function renormalization. We fit various empirical
phase shifts for pion laboratory momenta between 50 and 100 MeV. This leads to
a satisfactory description of the phase shifts up to momenta of about 200 MeV.
We also predict the threshold parameters, which turn out to be in good
agreement with the dispersive analysis. In particular, we can sharpen the
prediction for the isovector S-wave scattering length, $0.083 M_\pi^{-1} \leq
a_{0+}^- \leq 0.093 M_\pi^{-1}$. We also consider the subthreshold parameters
and give a short comparison to other calculations of $\pi N$ scattering in
chiral perturbation theory or modifications thereof.
| [
{
"created": "Fri, 6 Mar 1998 09:17:53 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Aug 1998 11:39:10 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Fettes",
"Nadia",
""
],
[
"Meißner",
"Ulf-G.",
""
],
[
"Steininger",
"Sven",
""
]
] | We construct the complete effective chiral pion-nucleon Lagrangian to third order in small momenta based on relativistic chiral perturbation theory. We then perform the so-called heavy baryon limit and construct all terms up-to-and-including order $1/m^2$ with fixed and free coefficients. As an application, we discuss in detail pion-nucleon scattering. In particular, we show that the $1/m$ expansion of the Born graphs calculated relativistically can be recovered exactly in the heavy baryon approach without any additional momentum-dependent wave function renormalization. We fit various empirical phase shifts for pion laboratory momenta between 50 and 100 MeV. This leads to a satisfactory description of the phase shifts up to momenta of about 200 MeV. We also predict the threshold parameters, which turn out to be in good agreement with the dispersive analysis. In particular, we can sharpen the prediction for the isovector S-wave scattering length, $0.083 M_\pi^{-1} \leq a_{0+}^- \leq 0.093 M_\pi^{-1}$. We also consider the subthreshold parameters and give a short comparison to other calculations of $\pi N$ scattering in chiral perturbation theory or modifications thereof. |
2212.06186 | Shufang Su | Shuailong Li, Huayang Song, Shufang Su, and Wei Su | Light Scalars at FASER | 37 pages, 6 figures | null | 10.1007/JHEP08(2023)001 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | FASER, the ForwArd Search ExpeRiment, is a currently operating experiment at
the Large Hadron Collider (LHC) that can detect light long-lived particles
produced in the forward region of the LHC interacting point. In this paper, we
study the prospect of detecting light CP-even and CP-odd scalars at FASER and
FASER 2. Considering a model-independent framework describing the most general
interactions between a CP-even or CP-odd scalar and SM particles using the
notation of coupling modifiers in the effective Lagrangian, we develop the
general formalism for the scalar production and decay. We then analyze the
FASER and FASER 2 reaches of light scalars in the large $\tan\beta$ region of
the Type-I two Higgs double model as a case study, in which light scalars with
relatively long lifetime could be accommodated. In the two benchmark scenarios
we considered, the light (pseudo)scalar decay length varies in $(10^{-8},
10^5)$ meters. Both FASER and FASER 2 can probe a large part of the parameter
space in the large $\tan\beta$ region up to $10^5$, extending beyond the
constraints of the other existing experiments.
| [
{
"created": "Mon, 12 Dec 2022 19:01:17 GMT",
"version": "v1"
}
] | 2023-08-16 | [
[
"Li",
"Shuailong",
""
],
[
"Song",
"Huayang",
""
],
[
"Su",
"Shufang",
""
],
[
"Su",
"Wei",
""
]
] | FASER, the ForwArd Search ExpeRiment, is a currently operating experiment at the Large Hadron Collider (LHC) that can detect light long-lived particles produced in the forward region of the LHC interacting point. In this paper, we study the prospect of detecting light CP-even and CP-odd scalars at FASER and FASER 2. Considering a model-independent framework describing the most general interactions between a CP-even or CP-odd scalar and SM particles using the notation of coupling modifiers in the effective Lagrangian, we develop the general formalism for the scalar production and decay. We then analyze the FASER and FASER 2 reaches of light scalars in the large $\tan\beta$ region of the Type-I two Higgs double model as a case study, in which light scalars with relatively long lifetime could be accommodated. In the two benchmark scenarios we considered, the light (pseudo)scalar decay length varies in $(10^{-8}, 10^5)$ meters. Both FASER and FASER 2 can probe a large part of the parameter space in the large $\tan\beta$ region up to $10^5$, extending beyond the constraints of the other existing experiments. |
hep-ph/0308196 | Ignacio Navarro | Ignacio Navarro | Phenomenology of low-scale supersymmetry breaking models | 18 pages, 4 figures, invited brief review for Modern Physics Letters
A | Mod.Phys.Lett.A18:2227-2242,2003 | 10.1142/S0217732303011897 | null | hep-ph | null | In this letter we consider the distinctive phenomenology of supersymmetric
models in which the scale of SUSY breaking is very low, \sqrt{F}= O(TeV),
focusing on the Higgs sector and the process of electroweak breaking. Using an
effective Lagrangian description of the interactions between the observable
fields and the SUSY breaking sector, it is shown how the conventional MSSM
picture can be substantially modified. For instance, the Higgs potential has
non-negligible SUSY breaking quartic couplings that can modify completely the
pattern of electroweak breaking and the Higgs spectrum with respect to that of
conventional MSSM-like models.
| [
{
"created": "Tue, 19 Aug 2003 14:22:56 GMT",
"version": "v1"
}
] | 2016-09-26 | [
[
"Navarro",
"Ignacio",
""
]
] | In this letter we consider the distinctive phenomenology of supersymmetric models in which the scale of SUSY breaking is very low, \sqrt{F}= O(TeV), focusing on the Higgs sector and the process of electroweak breaking. Using an effective Lagrangian description of the interactions between the observable fields and the SUSY breaking sector, it is shown how the conventional MSSM picture can be substantially modified. For instance, the Higgs potential has non-negligible SUSY breaking quartic couplings that can modify completely the pattern of electroweak breaking and the Higgs spectrum with respect to that of conventional MSSM-like models. |
hep-ph/0602035 | Arhrib Abdesslam | Abdesslam Arhrib and Wei-Shu Hou | Flavor Changing Neutral Currents involving Heavy Quarks with Four
Generations | 31 pages, 15 eps figures, version to appear in JHEP | JHEP 0607:009,2006 | 10.1088/1126-6708/2006/07/009 | null | hep-ph | null | We study various FCNC involving heavy quarks in the Standard Model (SM) with
a sequential fourth generation. After imposing $B\to X_s\gamma$, $B\to
X_sl^+l^-$ and $Z\to b\bar{b}$ constraints, we find ${\cal B}(Z\to
s\bar{b}+\bar{s}b)$ can be enhanced by an order of magnitude to $10^{-7}$,
while $t\to cZ, cH$ decays can reach $10^{-6}$, which are orders of magnitude
higher than in SM. However,these rates are still not observable for the near
future.With the era of LHC approaching, we focus on FCNC decays involving
fourth generation $b^\prime$ and $t^\prime$ quarks. We calculate the rates for
loop induced FCNC decays $b^\prime\to bZ, bH, bg, b\gamma$, as well as
$t^\prime\to tZ,\tH, tg, t\gamma$. If $|V_{cb'}|$ is of order $|V_{cb}| \simeq
0.04$, tree level $b^\prime\to cW$ decay would dominate, posing a challenge
since $b$-tagging is less effective. For $|V_{cb'}| \ll |V_{cb}|$, $b'\to tW$
would tend to dominate, while $b'\to t^\prime W^*$ could also open for heavier
$b'$, leading to thepossibility of quadruple-$W$ signals via $b'\bar b'\to
b\bar b W^+W^-W^+W^-$. The FCNC $b'\to bZ, bH$ decays could still dominate if
$m_{b'}$ is just above 200 GeV. For the case of $t'$, ingeneral $t^\prime\to
bW$ would be dominant, hence it behaves like a heavy top. For both $b'$ and
$t'$, except for the intriguing light $b'$ case, FCNC decays are in the
$10^{-4} -10^{-2}$ range, and are quite detectable at the LHC.For a possible
future ILC, we find the associated production of FCNC $e^+e^-\to b\bar s$,
$t\bar c$ are below sensitivity, while $e^+e^-\to b^\prime\bar b$
and$t^\prime\bar t$ can be better probed.Tevatron Run-II can still probe the
lighter $b'$ or $t'$ scenario. LHC would either discover the fourth generation
and measure the FCNC rates, or rule out the fourth generation conclusively.
| [
{
"created": "Fri, 3 Feb 2006 12:48:50 GMT",
"version": "v1"
},
{
"created": "Sun, 5 Feb 2006 06:05:56 GMT",
"version": "v2"
},
{
"created": "Mon, 10 Jul 2006 15:38:03 GMT",
"version": "v3"
}
] | 2010-02-03 | [
[
"Arhrib",
"Abdesslam",
""
],
[
"Hou",
"Wei-Shu",
""
]
] | We study various FCNC involving heavy quarks in the Standard Model (SM) with a sequential fourth generation. After imposing $B\to X_s\gamma$, $B\to X_sl^+l^-$ and $Z\to b\bar{b}$ constraints, we find ${\cal B}(Z\to s\bar{b}+\bar{s}b)$ can be enhanced by an order of magnitude to $10^{-7}$, while $t\to cZ, cH$ decays can reach $10^{-6}$, which are orders of magnitude higher than in SM. However,these rates are still not observable for the near future.With the era of LHC approaching, we focus on FCNC decays involving fourth generation $b^\prime$ and $t^\prime$ quarks. We calculate the rates for loop induced FCNC decays $b^\prime\to bZ, bH, bg, b\gamma$, as well as $t^\prime\to tZ,\tH, tg, t\gamma$. If $|V_{cb'}|$ is of order $|V_{cb}| \simeq 0.04$, tree level $b^\prime\to cW$ decay would dominate, posing a challenge since $b$-tagging is less effective. For $|V_{cb'}| \ll |V_{cb}|$, $b'\to tW$ would tend to dominate, while $b'\to t^\prime W^*$ could also open for heavier $b'$, leading to thepossibility of quadruple-$W$ signals via $b'\bar b'\to b\bar b W^+W^-W^+W^-$. The FCNC $b'\to bZ, bH$ decays could still dominate if $m_{b'}$ is just above 200 GeV. For the case of $t'$, ingeneral $t^\prime\to bW$ would be dominant, hence it behaves like a heavy top. For both $b'$ and $t'$, except for the intriguing light $b'$ case, FCNC decays are in the $10^{-4} -10^{-2}$ range, and are quite detectable at the LHC.For a possible future ILC, we find the associated production of FCNC $e^+e^-\to b\bar s$, $t\bar c$ are below sensitivity, while $e^+e^-\to b^\prime\bar b$ and$t^\prime\bar t$ can be better probed.Tevatron Run-II can still probe the lighter $b'$ or $t'$ scenario. LHC would either discover the fourth generation and measure the FCNC rates, or rule out the fourth generation conclusively. |
hep-ph/9705354 | John F. Dawson | Bogdan Mihaila, John F. Dawson, and Fred Cooper | Order 1/N corrections to the time-dependent Hartree approximation for a
system of N+1 oscillators | 14 pages, 11 figures. Submitted to Phys. Rev. D | Phys.Rev.D56:5400-5412,1997 | 10.1103/PhysRevD.56.5400 | LA-UR-97-1673 | hep-ph | null | We solve numerically to order 1/N the time evolution of a quantum dynamical
system of N oscillators of mass m coupled quadratically to a massless dynamic
variable. We use Schwinger's closed time path (CTP) formalism to derive the
equations. We compare two methods which differ by terms of order 1/N^2. The
first method is a direct perturbation theory in 1/N using the path integral.
The second solves exactly the theory defined by the effective action to order
1/N. We compare the results of both methods as a function of N. At N=1, where
we expect the expansion to be quite innacurate, we compare our results to an
exact numerical solution of the Schroedinger equation. In this case we find
that when the two methods disagree they also diverge from the exact answer. We
also find at N=1 that the 1/N corrected evolutions track the exact answer for
the expectation values much longer than the mean field (N= \infty) result.
| [
{
"created": "Mon, 19 May 1997 15:23:52 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Mihaila",
"Bogdan",
""
],
[
"Dawson",
"John F.",
""
],
[
"Cooper",
"Fred",
""
]
] | We solve numerically to order 1/N the time evolution of a quantum dynamical system of N oscillators of mass m coupled quadratically to a massless dynamic variable. We use Schwinger's closed time path (CTP) formalism to derive the equations. We compare two methods which differ by terms of order 1/N^2. The first method is a direct perturbation theory in 1/N using the path integral. The second solves exactly the theory defined by the effective action to order 1/N. We compare the results of both methods as a function of N. At N=1, where we expect the expansion to be quite innacurate, we compare our results to an exact numerical solution of the Schroedinger equation. In this case we find that when the two methods disagree they also diverge from the exact answer. We also find at N=1 that the 1/N corrected evolutions track the exact answer for the expectation values much longer than the mean field (N= \infty) result. |
hep-ph/9810294 | null | S.I. Bityukov (IHEP, Protvino), N.V. Krasnikov (INR, Moscow) | Gaugino pair production at LHC (CMS) | 1 latex file (5 pages). To be published in Proceedings of PQFT98
Conference, Dubna, 13-17 July, 1998 | null | null | null | hep-ph | null | We investigate \chi^{+/-}_1 \chi^0_2 pair production at LHC (CMS) with
subsequent decays into leptons for the case of nonuniversal gaugino masses.
Visibility of signal by an excess over SM background in 3l + no jets +
E^{miss}_T events depends rather strongly on the relation between LSP mass
\chi^0_1 and \chi^{+/-}_1 mass.
| [
{
"created": "Thu, 8 Oct 1998 17:35:05 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Bityukov",
"S. I.",
"",
"IHEP, Protvino"
],
[
"Krasnikov",
"N. V.",
"",
"INR, Moscow"
]
] | We investigate \chi^{+/-}_1 \chi^0_2 pair production at LHC (CMS) with subsequent decays into leptons for the case of nonuniversal gaugino masses. Visibility of signal by an excess over SM background in 3l + no jets + E^{miss}_T events depends rather strongly on the relation between LSP mass \chi^0_1 and \chi^{+/-}_1 mass. |
1805.05249 | Paolo Parotto | Paolo Parotto, Marcus Bluhm, Debora Mroczek, Marlene Nahrgang,
Jacquelyn Noronha-Hostler, Krishna Rajagopal, Claudia Ratti, Thomas Schaefer,
Mikhail Stephanov | QCD equation of state matched to lattice data and exhibiting a critical
point singularity | 39 pages, 18 figures, 2 tables, version published in Phys.Rev.C | Phys. Rev. C 101, 034901 (2020) | 10.1103/PhysRevC.101.034901 | MIT-CTP-5015 | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct a family of equations of state for QCD in the temperature range
30 MeV $\leq T\leq$ 800 MeV and in the chemical potential range $0\leq \mu_B
\leq$ 450 MeV. These equations of state match available lattice QCD results up
to $\mathcal{O}(\mu_B^4)$ and in each of them we place a critical point in the
3D Ising model universality class. The position of this critical point can be
chosen in the range of chemical potentials covered by the second Beam Energy
Scan at RHIC. We discuss possible choices for the free parameters, which arise
from mapping the Ising model onto QCD. Our results for the pressure, entropy
density, baryon density, energy density and speed of sound can be used as
inputs in the hydrodynamical simulations of the fireball created in heavy ion
collisions. We also show our result for the second cumulant of the baryon
number in thermal equilibrium, displaying its divergence at the critical point.
In the future, comparisons between RHIC data and the output of the hydrodynamic
simulations, including calculations of fluctuation observables, built upon the
model equations of state that we have constructed may be used to locate the
critical point in the QCD phase diagram, if there is one to be found.
| [
{
"created": "Mon, 14 May 2018 15:53:43 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Mar 2020 17:30:25 GMT",
"version": "v2"
}
] | 2020-03-11 | [
[
"Parotto",
"Paolo",
""
],
[
"Bluhm",
"Marcus",
""
],
[
"Mroczek",
"Debora",
""
],
[
"Nahrgang",
"Marlene",
""
],
[
"Noronha-Hostler",
"Jacquelyn",
""
],
[
"Rajagopal",
"Krishna",
""
],
[
"Ratti",
"Claudia",
... | We construct a family of equations of state for QCD in the temperature range 30 MeV $\leq T\leq$ 800 MeV and in the chemical potential range $0\leq \mu_B \leq$ 450 MeV. These equations of state match available lattice QCD results up to $\mathcal{O}(\mu_B^4)$ and in each of them we place a critical point in the 3D Ising model universality class. The position of this critical point can be chosen in the range of chemical potentials covered by the second Beam Energy Scan at RHIC. We discuss possible choices for the free parameters, which arise from mapping the Ising model onto QCD. Our results for the pressure, entropy density, baryon density, energy density and speed of sound can be used as inputs in the hydrodynamical simulations of the fireball created in heavy ion collisions. We also show our result for the second cumulant of the baryon number in thermal equilibrium, displaying its divergence at the critical point. In the future, comparisons between RHIC data and the output of the hydrodynamic simulations, including calculations of fluctuation observables, built upon the model equations of state that we have constructed may be used to locate the critical point in the QCD phase diagram, if there is one to be found. |
1610.08397 | Lorenzo Tancredi | Amedeo Primo and Lorenzo Tancredi | On the maximal cut of Feynman integrals and the solution of their
differential equations | 25 pages, v2 minor typos fixed and references added, version accepted
for publication on NPB | null | 10.1016/j.nuclphysb.2016.12.021 | TTP16-046 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The standard procedure for computing scalar multi-loop Feynman integrals
consists in reducing them to a basis of so-called master integrals, derive
differential equations in the external invariants satisfied by the latter and,
finally, try to solve them as a Laurent series in $\epsilon = (4-d)/2$, where
$d$ are the space-time dimensions. The differential equations are, in general,
coupled and can be solved using Euler's variation of constants, provided that a
set of homogeneous solutions is known. Given an arbitrary differential equation
of order higher than one, there exist no general method for finding its
homogeneous solutions. In this paper we show that the maximal cut of the
integrals under consideration provides one set of homogeneous solutions,
simplifying substantially the solution of the differential equations.
| [
{
"created": "Wed, 26 Oct 2016 16:20:30 GMT",
"version": "v1"
},
{
"created": "Fri, 20 Jan 2017 10:38:43 GMT",
"version": "v2"
}
] | 2017-04-05 | [
[
"Primo",
"Amedeo",
""
],
[
"Tancredi",
"Lorenzo",
""
]
] | The standard procedure for computing scalar multi-loop Feynman integrals consists in reducing them to a basis of so-called master integrals, derive differential equations in the external invariants satisfied by the latter and, finally, try to solve them as a Laurent series in $\epsilon = (4-d)/2$, where $d$ are the space-time dimensions. The differential equations are, in general, coupled and can be solved using Euler's variation of constants, provided that a set of homogeneous solutions is known. Given an arbitrary differential equation of order higher than one, there exist no general method for finding its homogeneous solutions. In this paper we show that the maximal cut of the integrals under consideration provides one set of homogeneous solutions, simplifying substantially the solution of the differential equations. |
0706.0454 | Alexei Smirnov Yu | S. P. Mikheev and A. Yu. Smirnov | Neutrino oscillations in a variable-density medium and $\nu-$ bursts due
to the gravitational collapse of stars | latex, 5 pages, 2 figures, comments (June 2007) added | Sov.Phys.JETP64:4-7,1986; Zh.Eksp.Teor.Fiz.91:7-13,1986 | null | null | hep-ph | null | Under certain conditions, the propagation of a beam of oscillating neutrinos
in a variable-density medium takes the form of an almost complete
transformation of the initial type of neutrino into another type. The depth of
oscillations is then negligible. The transformation can occur in the cores and
envelopes of collapsing stars.
| [
{
"created": "Mon, 4 Jun 2007 15:32:59 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Mikheev",
"S. P.",
""
],
[
"Smirnov",
"A. Yu.",
""
]
] | Under certain conditions, the propagation of a beam of oscillating neutrinos in a variable-density medium takes the form of an almost complete transformation of the initial type of neutrino into another type. The depth of oscillations is then negligible. The transformation can occur in the cores and envelopes of collapsing stars. |
2105.13210 | Hua Zhou | Hua Zhou, Qing Yu, Xu-Dong Huang, Xu-Chang Zheng, Xing-Gang Wu
(Chongqing University) | The $P$-wave charmonium annihilation into two photons $\chi_{c0,
c2}\rightarrow \gamma\gamma$ with high-order QCD corrections | null | null | 10.1140/epjc/s10052-021-09424-x | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we present a new analysis on the $P$-wave charmonium
annihilation into two photons up to next-to-next-to-leading order (NNLO) QCD
corrections by using the principle of maximum conformality (PMC). The
conventional perturbative QCD prediction shows strong scale dependence and
deviates largely from the BESIII measurements. After applying the PMC, we
obtain a more precise scale-invariant pQCD prediction, which also agrees with
the BESIII measurements within errors, i.e.
$R={\Gamma_{\gamma\gamma}(\chi_{c2})}
/{\Gamma_{\gamma\gamma}(\chi_{c0})}=0.246\pm0.013$, where the error is for
$\Delta\alpha_s(M_\tau)=\pm0.016$. By further considering the color-octet
contributions, even the central value can be in agreement with the data. This
shows the importance of a correct scale-setting approach. We also give a
prediction for the ratio involving $\chi_{b0, b2} \to\gamma\gamma$, which could
be tested in future Belle II experiment.
| [
{
"created": "Thu, 27 May 2021 14:55:57 GMT",
"version": "v1"
}
] | 2021-07-28 | [
[
"Zhou",
"Hua",
"",
"Chongqing University"
],
[
"Yu",
"Qing",
"",
"Chongqing University"
],
[
"Huang",
"Xu-Dong",
"",
"Chongqing University"
],
[
"Zheng",
"Xu-Chang",
"",
"Chongqing University"
],
[
"Wu",
"Xing-Gang",
"",
... | In this paper, we present a new analysis on the $P$-wave charmonium annihilation into two photons up to next-to-next-to-leading order (NNLO) QCD corrections by using the principle of maximum conformality (PMC). The conventional perturbative QCD prediction shows strong scale dependence and deviates largely from the BESIII measurements. After applying the PMC, we obtain a more precise scale-invariant pQCD prediction, which also agrees with the BESIII measurements within errors, i.e. $R={\Gamma_{\gamma\gamma}(\chi_{c2})} /{\Gamma_{\gamma\gamma}(\chi_{c0})}=0.246\pm0.013$, where the error is for $\Delta\alpha_s(M_\tau)=\pm0.016$. By further considering the color-octet contributions, even the central value can be in agreement with the data. This shows the importance of a correct scale-setting approach. We also give a prediction for the ratio involving $\chi_{b0, b2} \to\gamma\gamma$, which could be tested in future Belle II experiment. |
hep-ph/0508261 | Sandy Donnachie | A Donnachie | A Comprehensive Approach to Structure Functions | Summary of talk given at the XIth International Conference on Elastic
and Diffractive Scattering, Chateau de Blois, France, May 15-20, 2005 | null | null | null | hep-ph | null | A model is presented based on a dipole picture with a hard and a soft
pomeron. It is assumed that large dipoles couple to the soft pomeron and small
dipoels couple to the hard pomeron. Most of the parameters of the model are
predetermined from proton-proton scattering and the only free parameter is the
radius Rc, defining the transition from small to large dipoles. This is fixed
by the proton structure function. The model then successfully predicts the
proton charm and longitudinal structure functions, J/psi photoproduction, the
DVCS cross section, the total gamma-p and gamma-gamma cross sections and the
photon structure function.
| [
{
"created": "Thu, 25 Aug 2005 08:38:31 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Donnachie",
"A",
""
]
] | A model is presented based on a dipole picture with a hard and a soft pomeron. It is assumed that large dipoles couple to the soft pomeron and small dipoels couple to the hard pomeron. Most of the parameters of the model are predetermined from proton-proton scattering and the only free parameter is the radius Rc, defining the transition from small to large dipoles. This is fixed by the proton structure function. The model then successfully predicts the proton charm and longitudinal structure functions, J/psi photoproduction, the DVCS cross section, the total gamma-p and gamma-gamma cross sections and the photon structure function. |
2312.09189 | Innes Bigaran | Innes Bigaran, Bogdan A. Dobrescu, Alessandro Russo | Mutually elusive: vectorlike antileptons and leptoquarks | 11 pages, 10 figures. B -> K nu nubar constraint included in Figure
4, three new footnotes added, other minor revisions. Version accepted by PRD | null | 10.1103/PhysRevD.109.055033 | FERMILAB-PUB-23-661-T | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | We study the properties of vectorlike fermions that have the same gauge
charges as the Standard Model lepton doublets, but opposite lepton number.
These antileptons undergo decays mediated by heavier scalar leptoquarks, while
the symmetries of this renormalizable model protect the vectorlike fermions and
the leptoquarks from standard decays probed so far at colliders. If the new
particles couple predominantly to second-generation quarks, then their collider
probes involve multiple jets and two taus or neutrinos, and are hampered by
large backgrounds. If couplings to third-generation quarks are large, then the
collider signals involve top quarks, and can be probed more efficiently at the
LHC. Even in that case, both the vectorlike fermion doublet and the leptoquarks
remain more elusive than in models with standard decays.
| [
{
"created": "Thu, 14 Dec 2023 18:11:30 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Mar 2024 22:10:05 GMT",
"version": "v2"
}
] | 2024-03-25 | [
[
"Bigaran",
"Innes",
""
],
[
"Dobrescu",
"Bogdan A.",
""
],
[
"Russo",
"Alessandro",
""
]
] | We study the properties of vectorlike fermions that have the same gauge charges as the Standard Model lepton doublets, but opposite lepton number. These antileptons undergo decays mediated by heavier scalar leptoquarks, while the symmetries of this renormalizable model protect the vectorlike fermions and the leptoquarks from standard decays probed so far at colliders. If the new particles couple predominantly to second-generation quarks, then their collider probes involve multiple jets and two taus or neutrinos, and are hampered by large backgrounds. If couplings to third-generation quarks are large, then the collider signals involve top quarks, and can be probed more efficiently at the LHC. Even in that case, both the vectorlike fermion doublet and the leptoquarks remain more elusive than in models with standard decays. |
hep-ph/0504121 | Jose L. Goity | J. L. Goity | 1/Nc Countings in Baryons: Mixings and Decays | 12 pages, 1 figure, 2 tables | null | 10.1142/9789812701725_0014 | JLAB-THY-05-314} | hep-ph | null | Based on a valence-quark picture of large Nc baryons, I describe in some
detail the 1/Nc power counting for decays and spin-flavor configuration mixings
in baryons.
| [
{
"created": "Fri, 15 Apr 2005 02:44:18 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Goity",
"J. L.",
""
]
] | Based on a valence-quark picture of large Nc baryons, I describe in some detail the 1/Nc power counting for decays and spin-flavor configuration mixings in baryons. |
2105.07210 | Cyrin Neeraj | Arvind Bhaskar, Tanumoy Mandal, Subhadip Mitra, Cyrin Neeraj, Swapnil
Raz | LHC Bounds on $R_{D^{(*)}}$ motivated Leptoquark Models | 4 pages, 1 figure, Contribution to the proceedings of XXIV DAE-BRNS
High Energy Physics Symposium 2020, NISER, Bhubaneswar, India, 14-18 December
2020 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Most of the popular explanations of the observed anomalies in the
semileptonic $B$-meson decays involve TeV scale Leptoquarks (LQs). Among the
various possible LQ models, two particular LQs -- $S_{1}(3, 1, 1/3)$ and
$U_{1}(3, 1, 2/3)$ seem to be most promising. Here, we use current LHC data to
constrain the $S_{1}(3, 1, 1/3)$ and $U_{1}(3, 1, 2/3)$ parameter spaces
relevant for the $R_{D^{(*)}}$ observables. We recast the latest ATLAS
$\tau\tau$ resonance search data to obtain new exclusion limits. For this
purpose, we consider both resonant (pair and single productions) and
non-resonant ($t$-channel LQ exchange) productions of these LQs at the LHC. For
the limits, the most dominant contribution comes from the (destructive)
interference of the non-resonant production with Standard Model backgrounds.
The combined contribution from the pair and inclusive single production
processes is less prominent but non-negligible. The limits we get are
independent and competitive to other known bounds. For both the models, we set
limits on $R_{D^{(*)}}$ motivated couplings.
| [
{
"created": "Sat, 15 May 2021 12:09:37 GMT",
"version": "v1"
}
] | 2021-05-18 | [
[
"Bhaskar",
"Arvind",
""
],
[
"Mandal",
"Tanumoy",
""
],
[
"Mitra",
"Subhadip",
""
],
[
"Neeraj",
"Cyrin",
""
],
[
"Raz",
"Swapnil",
""
]
] | Most of the popular explanations of the observed anomalies in the semileptonic $B$-meson decays involve TeV scale Leptoquarks (LQs). Among the various possible LQ models, two particular LQs -- $S_{1}(3, 1, 1/3)$ and $U_{1}(3, 1, 2/3)$ seem to be most promising. Here, we use current LHC data to constrain the $S_{1}(3, 1, 1/3)$ and $U_{1}(3, 1, 2/3)$ parameter spaces relevant for the $R_{D^{(*)}}$ observables. We recast the latest ATLAS $\tau\tau$ resonance search data to obtain new exclusion limits. For this purpose, we consider both resonant (pair and single productions) and non-resonant ($t$-channel LQ exchange) productions of these LQs at the LHC. For the limits, the most dominant contribution comes from the (destructive) interference of the non-resonant production with Standard Model backgrounds. The combined contribution from the pair and inclusive single production processes is less prominent but non-negligible. The limits we get are independent and competitive to other known bounds. For both the models, we set limits on $R_{D^{(*)}}$ motivated couplings. |
0910.5554 | Nobuhiro Uekusa | Nobuhiro Uekusa | Mass ratio of W and Z bosons in SU(5) gauge-Higgs unification | 22 pages | Mod.Phys.Lett.A25:1071-1097,2010 | 10.1142/S0217732310032950 | OU-HET 646/2009 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the mass ratio of W and Z bosons in an SU(5) gauge-Higgs unification
model with the left-right symmetry remaining locally for boundary conditions
and with no scalar fields except for the extra-dimensional component of gauge
bosons. We find that there are a variety of boundary conditions to yield
distinct values of the mass ratio.
| [
{
"created": "Thu, 29 Oct 2009 06:20:47 GMT",
"version": "v1"
}
] | 2010-04-28 | [
[
"Uekusa",
"Nobuhiro",
""
]
] | We study the mass ratio of W and Z bosons in an SU(5) gauge-Higgs unification model with the left-right symmetry remaining locally for boundary conditions and with no scalar fields except for the extra-dimensional component of gauge bosons. We find that there are a variety of boundary conditions to yield distinct values of the mass ratio. |
0711.3137 | Peter Richardson | M. Bahr, S. Gieseke, M. Gigg, D. Grellscheid, K. Hamilton, O.
Latunde-Dada, S. Platzer, P. Richardson, M. H. Seymour, A. Sherstnev and B.
R. Webber | Herwig++ 2.1 Release Note | Program available at http://projects.hepforge.org/herwig/ | null | null | Cavendish-HEP-07/10, CERN-PH-TH/226, CP3-07-30, IPPP/07/89,
DCPT/07/178, KA-TP-30 | hep-ph | null | A new release of the Monte Carlo program Herwig++ (version 2.1) is now
available. This version includes a number of significant improvements
including: an eikonal multiple parton-parton scattering model of the underlying
event; the inclusion of Beyond the Standard Model physics; and a new hadronic
decay model tuned to LEP data. This version of the program is now fully ready
for the simulation of events in hadron-hadron collisions.
| [
{
"created": "Tue, 20 Nov 2007 15:09:18 GMT",
"version": "v1"
}
] | 2007-11-21 | [
[
"Bahr",
"M.",
""
],
[
"Gieseke",
"S.",
""
],
[
"Gigg",
"M.",
""
],
[
"Grellscheid",
"D.",
""
],
[
"Hamilton",
"K.",
""
],
[
"Latunde-Dada",
"O.",
""
],
[
"Platzer",
"S.",
""
],
[
"Richardson",
"... | A new release of the Monte Carlo program Herwig++ (version 2.1) is now available. This version includes a number of significant improvements including: an eikonal multiple parton-parton scattering model of the underlying event; the inclusion of Beyond the Standard Model physics; and a new hadronic decay model tuned to LEP data. This version of the program is now fully ready for the simulation of events in hadron-hadron collisions. |
hep-ph/9606364 | Peter Morawitz | H.Dreiner, S.Lola, P.Morawitz | Chargino Pair Production at LEP2 with Broken R-Parity: 4-jet Final
States | null | Phys.Lett. B389 (1996) 62-72 | 10.1016/S0370-2693(96)01236-1 | null | hep-ph | null | We study the pair production of charginos in e+e- collisions followed by the
decay via R-parity violating LQD operators. We determine the complete matrix
element squared for chargino decays via LQD or LLE operators. We find regions
in MSSM parameter space where the chargino mass is 52.5GeV and the R-parity
violating decays of the charginos dominate the gauge decays to neutralinos. At
LEP2 this then leads to additional 4 jet events which could explain the excess
recently observed by ALEPH.
| [
{
"created": "Tue, 18 Jun 1996 23:01:25 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Jun 1996 09:07:32 GMT",
"version": "v2"
}
] | 2019-08-17 | [
[
"Dreiner",
"H.",
""
],
[
"Lola",
"S.",
""
],
[
"Morawitz",
"P.",
""
]
] | We study the pair production of charginos in e+e- collisions followed by the decay via R-parity violating LQD operators. We determine the complete matrix element squared for chargino decays via LQD or LLE operators. We find regions in MSSM parameter space where the chargino mass is 52.5GeV and the R-parity violating decays of the charginos dominate the gauge decays to neutralinos. At LEP2 this then leads to additional 4 jet events which could explain the excess recently observed by ALEPH. |
hep-ph/9402236 | Christian Weiss | Yu. L. Kalinovsky and C. Weiss | Heavy--light mesons in a bilocal effective theory | (34 p., standard LaTeX, 7 PostScript figures appended)
UNITUE-THEP-17/93 | Z.Phys. C63 (1994) 275-290 | 10.1007/BF01411021 | null | hep-ph | null | Heavy--light mesons are described in an effective quark theory with a
two--body vector--type interaction. The bilocal interaction is taken to be
instantaneous in the rest frame of the bound state, but formulated covariantly
through the use of a boost vector. The chiral symmetry of the light flavor is
broken spontaneously at mean field level. The framework for our discussion of
bound states is the effective bilocal meson action obtained by bosonization of
the quark theory. Mesons are described by 3--dimensional wave functions
satisfying Salpeter equations, which exhibit both Goldstone solutions in the
chiral limit and heavy--quark symmetry for $m_Q\rightarrow\infty$. We present
numerical solutions for pseudoscalar $D$-- and $B$--mesons. Heavy--light meson
spectra and decay constants are seen to be sensitive to the description of
chiral symmetry breaking (dynamically generated vs.\ constant quark mass).
| [
{
"created": "Mon, 7 Feb 1994 18:27:56 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Kalinovsky",
"Yu. L.",
""
],
[
"Weiss",
"C.",
""
]
] | Heavy--light mesons are described in an effective quark theory with a two--body vector--type interaction. The bilocal interaction is taken to be instantaneous in the rest frame of the bound state, but formulated covariantly through the use of a boost vector. The chiral symmetry of the light flavor is broken spontaneously at mean field level. The framework for our discussion of bound states is the effective bilocal meson action obtained by bosonization of the quark theory. Mesons are described by 3--dimensional wave functions satisfying Salpeter equations, which exhibit both Goldstone solutions in the chiral limit and heavy--quark symmetry for $m_Q\rightarrow\infty$. We present numerical solutions for pseudoscalar $D$-- and $B$--mesons. Heavy--light meson spectra and decay constants are seen to be sensitive to the description of chiral symmetry breaking (dynamically generated vs.\ constant quark mass). |
hep-ph/0002041 | Michael E. Peskin | Michael E. Peskin | Theoretical Summary Lecture for EPS HEP99 | latex, 41 pages, 15 figures, 2 tables, to appear in the proceedings
of the 1999 EPS High Energy Physics conference; minor corrections and 3 added
references | null | null | SLAC-PUB-8351 | hep-ph hep-ex | null | This is the proceedings article for the concluding lecture of the 1999 High
Energy Physics Conference of the European Physical Society. In this article, I
review a number of topics that were highlighted at the meeting and have more
general importance in high energy physics. The major topics discussed include:
(1) precision electroweak physics, (2) CP violation, (3) new directions in QCD,
(4) supersymmetry spectroscopy, (5) the experimental physics of extra
dimensions.
| [
{
"created": "Thu, 3 Feb 2000 17:15:01 GMT",
"version": "v1"
},
{
"created": "Wed, 31 May 2000 23:48:53 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Peskin",
"Michael E.",
""
]
] | This is the proceedings article for the concluding lecture of the 1999 High Energy Physics Conference of the European Physical Society. In this article, I review a number of topics that were highlighted at the meeting and have more general importance in high energy physics. The major topics discussed include: (1) precision electroweak physics, (2) CP violation, (3) new directions in QCD, (4) supersymmetry spectroscopy, (5) the experimental physics of extra dimensions. |
hep-ph/0512365 | Jaroslaw Nowak | Cezary Juszczak, Jaroslaw A. Nowak, Jan T. Sobczyk | Simulations from a new neutrino event generator | To appear in the proceedings of 4th International Workshop on
Neutrino Nucleus Interactions in the Few GeV Region (NuInt05), Okayama,
Japan, 26-29 September, 2005 | null | 10.1016/j.nuclphysbps.2006.08.069 | null | hep-ph | null | We construct a new Monte Carlo generator of events for neutrino interactions.
The dynamical models for quasi-elastic reactions, $\Delta$ excitation and more
inelastic events described by the DIS formalism with the PDFs modified
according to recent JLab data are used. We describe in detail single pion
production channels, which combine the $\Delta$ excitation and DIS
contribution. Many comparisons of the outcome of simulations with experimental
data are presented.
| [
{
"created": "Thu, 29 Dec 2005 21:47:57 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Juszczak",
"Cezary",
""
],
[
"Nowak",
"Jaroslaw A.",
""
],
[
"Sobczyk",
"Jan T.",
""
]
] | We construct a new Monte Carlo generator of events for neutrino interactions. The dynamical models for quasi-elastic reactions, $\Delta$ excitation and more inelastic events described by the DIS formalism with the PDFs modified according to recent JLab data are used. We describe in detail single pion production channels, which combine the $\Delta$ excitation and DIS contribution. Many comparisons of the outcome of simulations with experimental data are presented. |
hep-ph/0609047 | Andrea Romanino | Luca Ferretti, Stephen F. King, Andrea Romanino | Flavour from accidental symmetries | 15 pages, 1 eps figure, references added | JHEP0611:078,2006 | 10.1088/1126-6708/2006/11/078 | null | hep-ph | null | We consider a new approach to fermion masses and mixings in which no special
"horizontal" dynamics is invoked to account for the hierarchical pattern of
charged fermion masses and for the peculiar features of neutrino masses. The
hierarchy follows from the vertical, family-independent structure of the model,
in particular from the breaking pattern of the Pati-Salam group. The lightness
of the first two fermion families can be related to two family symmetries
emerging in this context as accidental symmetries.
| [
{
"created": "Tue, 5 Sep 2006 14:32:33 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Nov 2006 09:49:40 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Ferretti",
"Luca",
""
],
[
"King",
"Stephen F.",
""
],
[
"Romanino",
"Andrea",
""
]
] | We consider a new approach to fermion masses and mixings in which no special "horizontal" dynamics is invoked to account for the hierarchical pattern of charged fermion masses and for the peculiar features of neutrino masses. The hierarchy follows from the vertical, family-independent structure of the model, in particular from the breaking pattern of the Pati-Salam group. The lightness of the first two fermion families can be related to two family symmetries emerging in this context as accidental symmetries. |
2212.06057 | Christian Kohlf\"urst | Christian Kohlf\"urst | The Heisenberg-Wigner formalism for transverse fields | 25 pages | null | null | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the Heisenberg-Wigner phase-space formalism in quantum
electrodynamics as well as scalar quantum electrodynamics with respect to
transverse fields. In regard to the special characteristics of such field types
we derive modified transport equations such that particle momenta perpendicular
to the propagation direction of the waves show up as external parameters only.
In case of spatially oscillating fields we further demonstrate how to transform
momentum derivative operators of infinite order into simple coupling terms.
| [
{
"created": "Mon, 12 Dec 2022 17:26:45 GMT",
"version": "v1"
}
] | 2022-12-13 | [
[
"Kohlfürst",
"Christian",
""
]
] | We discuss the Heisenberg-Wigner phase-space formalism in quantum electrodynamics as well as scalar quantum electrodynamics with respect to transverse fields. In regard to the special characteristics of such field types we derive modified transport equations such that particle momenta perpendicular to the propagation direction of the waves show up as external parameters only. In case of spatially oscillating fields we further demonstrate how to transform momentum derivative operators of infinite order into simple coupling terms. |
2401.05644 | Pijushpani Bhattacharjee | Pijushpani Bhattacharjee, Kamales Kar | Elastic scattering of supernova neutrinos with electrons in xenon | Replaced with revised version; References added; minor changes in
text; 12 pages Latex, 3 Figures | null | null | null | hep-ph astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | Neutrinos from a Galactic core collapse supernova can undergo elastic
scattering with electrons in xenon atoms in liquid xenon based dark matter
detectors giving rise to electrons of kinetic energy up to a few MeV. We
calculate the scattered electron spectrum and the number of such elastic
scattering events expected for a typical Galactic core collapse supernova in a
xenon target. Although the expected number of events is small (compared to, for
example, inelastic neutrino-nucleus charged current interaction with xenon
nuclei, that also gives rise to final state electrons), the distinct spectral
shape of the scattered electrons may allow identification of the elastic
scattering events. Further, while the process is dominated by neutrinos and
antineutrinos of electron flavor, it receives contributions from all the six
neutrino species. Identification of the electron scattering events may,
therefore, allow an estimation of the relative fractions of the total supernova
explosion energy going into electron flavored and non-electron flavored
neutrinos.
| [
{
"created": "Thu, 11 Jan 2024 03:38:54 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Jan 2024 03:41:17 GMT",
"version": "v2"
}
] | 2024-01-22 | [
[
"Bhattacharjee",
"Pijushpani",
""
],
[
"Kar",
"Kamales",
""
]
] | Neutrinos from a Galactic core collapse supernova can undergo elastic scattering with electrons in xenon atoms in liquid xenon based dark matter detectors giving rise to electrons of kinetic energy up to a few MeV. We calculate the scattered electron spectrum and the number of such elastic scattering events expected for a typical Galactic core collapse supernova in a xenon target. Although the expected number of events is small (compared to, for example, inelastic neutrino-nucleus charged current interaction with xenon nuclei, that also gives rise to final state electrons), the distinct spectral shape of the scattered electrons may allow identification of the elastic scattering events. Further, while the process is dominated by neutrinos and antineutrinos of electron flavor, it receives contributions from all the six neutrino species. Identification of the electron scattering events may, therefore, allow an estimation of the relative fractions of the total supernova explosion energy going into electron flavored and non-electron flavored neutrinos. |
2302.11906 | Sudeep Saha Mr. | Jai More, Asmita Mukherjee, Sreeraj Nair and Sudeep Saha | Gluon contribution to the mechanical properties of a dressed quark in
light-front Hamiltonian QCD | 17 pages, 8 figures | null | 10.1103/PhysRevD.107.116005 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the contribution to the gravitational form factors (GFFs) from
the gluon part of the energy-momentum tensor in QCD. We take a simple spin
$1/2$ composite state, namely a quark dressed with a gluon. We use the
light-front Hamiltonian QCD approach in the light-front gauge. We also present
the effect of the gluon on the mechanical properties like the pressure, shear
and energy distributions of the dressed quark state.
| [
{
"created": "Thu, 23 Feb 2023 10:27:35 GMT",
"version": "v1"
}
] | 2023-06-21 | [
[
"More",
"Jai",
""
],
[
"Mukherjee",
"Asmita",
""
],
[
"Nair",
"Sreeraj",
""
],
[
"Saha",
"Sudeep",
""
]
] | We calculate the contribution to the gravitational form factors (GFFs) from the gluon part of the energy-momentum tensor in QCD. We take a simple spin $1/2$ composite state, namely a quark dressed with a gluon. We use the light-front Hamiltonian QCD approach in the light-front gauge. We also present the effect of the gluon on the mechanical properties like the pressure, shear and energy distributions of the dressed quark state. |
hep-ph/9506364 | null | Jonathan L. Rosner | Present and Future Aspects of CP Violation | 58 pages, latex, 14 uuencoded figures sent separately | null | null | EFI-95-36 | hep-ph | null | This series of five lectures describes aspects of CP violation, emphasizing
its description within the standard electroweak model. After discussing the
kaon system, the only place in which CP violation has been seen so far, we turn
to the leading contender for the effect, complex phases in the
Cabibbo-Kobayashi-Maskawa (CKM) matrix. A number of suggestions are made for
improved tests of the standard picture. Hadrons containing $b$ quarks play a
key role in this program, and are discussed separately. We also mention a
number of non-standard and speculative aspects of CP violation, including
alternatives to the CKM description, direct tests of time reversal invariance,
and baryogenesis.
| [
{
"created": "Mon, 19 Jun 1995 18:53:59 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Rosner",
"Jonathan L.",
""
]
] | This series of five lectures describes aspects of CP violation, emphasizing its description within the standard electroweak model. After discussing the kaon system, the only place in which CP violation has been seen so far, we turn to the leading contender for the effect, complex phases in the Cabibbo-Kobayashi-Maskawa (CKM) matrix. A number of suggestions are made for improved tests of the standard picture. Hadrons containing $b$ quarks play a key role in this program, and are discussed separately. We also mention a number of non-standard and speculative aspects of CP violation, including alternatives to the CKM description, direct tests of time reversal invariance, and baryogenesis. |
1009.3423 | Alexei Prokudin | Vincenzo Barone, Stefano Melis, Alexei Prokudin | Azimuthal asymmetries in unpolarized Drell-Yan processes and the
Boer-Mulders distributions of antiquarks | 7 pages, 3 figures | Phys.Rev.D82:114025,2010 | 10.1103/PhysRevD.82.114025 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using a previous extraction of the quark Boer-Mulders distributions from
semiinclusive deep inelastic scattering data, we fit the unpolarized Drell-Yan
data on the $\cos 2 \phi$ asymmetry, determining the antiquark Boer-Mulders
distributions. A good agreement with the data is found in the region of low
$q_T$, where the transverse-momentum factorization approach applies.
| [
{
"created": "Fri, 17 Sep 2010 13:35:23 GMT",
"version": "v1"
}
] | 2011-01-20 | [
[
"Barone",
"Vincenzo",
""
],
[
"Melis",
"Stefano",
""
],
[
"Prokudin",
"Alexei",
""
]
] | Using a previous extraction of the quark Boer-Mulders distributions from semiinclusive deep inelastic scattering data, we fit the unpolarized Drell-Yan data on the $\cos 2 \phi$ asymmetry, determining the antiquark Boer-Mulders distributions. A good agreement with the data is found in the region of low $q_T$, where the transverse-momentum factorization approach applies. |
0807.1038 | Jorge Noronha | Jorge Noronha, Miklos Gyulassy, and Giorgio Torrieri | Di-Jet Conical Correlations Associated with Heavy Quark Jets in anti--de
Sitter Space/Conformal Field Theory Correspondence | 4 pages, 2 figures, version published in Physical Review Letters | Phys.Rev.Lett.102:102301,2009 | 10.1103/PhysRevLett.102.102301 | null | hep-ph hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that far zone Mach and diffusion wake ``holograms'' produced by
supersonic strings in anti--de Sitter space/conformal field theory (AdS/CFT)
correspondence do not lead to observable conical angular correlations in the
strict $N_c\to\infty$ supergravity limit if Cooper-Frye hadronization is
assumed. However, a special {\em nonequilibrium} ``neck'' zone near the jet is
shown to produce an apparent sonic boom azimuthal angle distribution that is
roughly independent of the heavy quark's velocity. Our results indicate that a
measurement of the dependence of the away-side correlations on the velocity of
associated identified heavy quark jets at the BNL Relativistic Heavy Ion
Collider and CERN LHC will provide a direct test of the nonperturbative
dynamics involved in the coupling between jets and the strongly-coupled
Quark-Gluon Plasma (sQGP) implied by AdS/CFT correspondence.
| [
{
"created": "Mon, 7 Jul 2008 15:25:26 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Mar 2009 14:46:49 GMT",
"version": "v2"
}
] | 2009-04-08 | [
[
"Noronha",
"Jorge",
""
],
[
"Gyulassy",
"Miklos",
""
],
[
"Torrieri",
"Giorgio",
""
]
] | We show that far zone Mach and diffusion wake ``holograms'' produced by supersonic strings in anti--de Sitter space/conformal field theory (AdS/CFT) correspondence do not lead to observable conical angular correlations in the strict $N_c\to\infty$ supergravity limit if Cooper-Frye hadronization is assumed. However, a special {\em nonequilibrium} ``neck'' zone near the jet is shown to produce an apparent sonic boom azimuthal angle distribution that is roughly independent of the heavy quark's velocity. Our results indicate that a measurement of the dependence of the away-side correlations on the velocity of associated identified heavy quark jets at the BNL Relativistic Heavy Ion Collider and CERN LHC will provide a direct test of the nonperturbative dynamics involved in the coupling between jets and the strongly-coupled Quark-Gluon Plasma (sQGP) implied by AdS/CFT correspondence. |
hep-ph/0408259 | Edmond Berger | Edmond L. Berger | Determination of the HWW and HZZ Couplings at the LHC | 5 pages, 1 figure. To be published in the Proceedings of the 12th
International Conference on Supersymmetry and Unification of Fundamental
Interactions (SUSY 2004) June 17-23, 2004, Tsukuba, Japan | null | null | ANL-HEP-CP-04-79 | hep-ph | null | The weak boson fusion process for neutral Higgs boson production is
investigated with particular attention to the accuracy with which the Higgs
boson couplings to weak bosons can be determined in final states that contain a
Higgs boson plus at least two jets at CERN Large Hadron Collider energies. We
determine that an accuracy of \delta g/g ~ 10% on the effective coupling g may
be possible after the accumulation of ~ 200 inverse fb of integrated
luminosity.
| [
{
"created": "Tue, 24 Aug 2004 17:46:56 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Berger",
"Edmond L.",
""
]
] | The weak boson fusion process for neutral Higgs boson production is investigated with particular attention to the accuracy with which the Higgs boson couplings to weak bosons can be determined in final states that contain a Higgs boson plus at least two jets at CERN Large Hadron Collider energies. We determine that an accuracy of \delta g/g ~ 10% on the effective coupling g may be possible after the accumulation of ~ 200 inverse fb of integrated luminosity. |
2304.07782 | ChunHao Fu | ChunHao Fu and Jun Gao | Constraint for a light charged Higgs boson and its neutral partners from
top quark pairs at the LHC | 10 pages, 9 figures; v2 matches the published version | Phys. Rev. D, 108, 035007 (2023) | 10.1103/PhysRevD.108.035007 | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | The charged Higgs boson plays an essential role in distinguishing between a
wide variety of standard model extensions with multiple Higgs doublets, and has
been searched for in various collider experiments. This paper expands our
previous work to a broader Higgs mass space with discussions on subsequent
issues. We study the prospect of a light charged Higgs boson, produced by top
quark pairs at the Large Hadron Collider (LHC), and decaying into a $W$ boson
(can be off shell) and a pair of bottom quarks via on-shell production of an
intermediate neutral Higgs boson. We reinterpret the cross sections of
$WWbb\bar{b}\bar{b}$ final states measured by the ATLAS collaboration at LHC 13
TeV in the presence of the decay chain: $t \rightarrow H^+ b, H^+ \rightarrow
W^+ H_i, H_i \rightarrow b \bar{b}$, and H.c., where $H_i$ is a neutral Higgs
boson variably lighter than the charged Higgs boson. We find improved
agreements with the data and obtain limits on the total branching ratio of the
aforementioned decay chain. The limits impose the strongest constraints on the
parameter space of type-I two-Higgs-doublet model for most Higgs masses sampled
when $H_i$ is the $CP$-odd Higgs boson $A$. We also calculate potential
constraints with pseudodata in high-luminosity runs of the LHC.
| [
{
"created": "Sun, 16 Apr 2023 13:31:34 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Aug 2023 14:56:13 GMT",
"version": "v2"
}
] | 2023-09-12 | [
[
"Fu",
"ChunHao",
""
],
[
"Gao",
"Jun",
""
]
] | The charged Higgs boson plays an essential role in distinguishing between a wide variety of standard model extensions with multiple Higgs doublets, and has been searched for in various collider experiments. This paper expands our previous work to a broader Higgs mass space with discussions on subsequent issues. We study the prospect of a light charged Higgs boson, produced by top quark pairs at the Large Hadron Collider (LHC), and decaying into a $W$ boson (can be off shell) and a pair of bottom quarks via on-shell production of an intermediate neutral Higgs boson. We reinterpret the cross sections of $WWbb\bar{b}\bar{b}$ final states measured by the ATLAS collaboration at LHC 13 TeV in the presence of the decay chain: $t \rightarrow H^+ b, H^+ \rightarrow W^+ H_i, H_i \rightarrow b \bar{b}$, and H.c., where $H_i$ is a neutral Higgs boson variably lighter than the charged Higgs boson. We find improved agreements with the data and obtain limits on the total branching ratio of the aforementioned decay chain. The limits impose the strongest constraints on the parameter space of type-I two-Higgs-doublet model for most Higgs masses sampled when $H_i$ is the $CP$-odd Higgs boson $A$. We also calculate potential constraints with pseudodata in high-luminosity runs of the LHC. |
1901.06426 | Renato Zamora | M. Correa, M. Loewe, D. Valenzuela and R. Zamora | Magnetic renormalons in a scalar self interacting $\lambda \phi^{4}$
theory | 7 pages, 4 figures. Typos and misprints have been corrected. Explicit
calculations have also been given, the conclusions remain the same as in the
first version. Accepted for publication in Phys. Rev. D | Phys. Rev. D 99, 096024 (2019) | 10.1103/PhysRevD.99.096024 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present an analysis about the influence of an external magnetic field on
renormalons in a self interacting theory $\lambda \phi ^{4}$. In the weak
magnetic field region, using an appropriate expansion for the Schwinger
propagator's, we find new renormalons as poles on the real axis of the Borel
plane, whose position do not depend on the magnetic field, but where the
residues acquire in fact a magnetic dependence. In the strong magnetic limit,
working in the lowest Landau level approximation (LLLA), these new poles are
not longer present. We compare the magnetic scenario with previous results in
the literature concerning thermal effects on renormalons in this theory.
| [
{
"created": "Fri, 18 Jan 2019 21:56:37 GMT",
"version": "v1"
},
{
"created": "Sat, 4 May 2019 00:05:20 GMT",
"version": "v2"
}
] | 2019-06-05 | [
[
"Correa",
"M.",
""
],
[
"Loewe",
"M.",
""
],
[
"Valenzuela",
"D.",
""
],
[
"Zamora",
"R.",
""
]
] | We present an analysis about the influence of an external magnetic field on renormalons in a self interacting theory $\lambda \phi ^{4}$. In the weak magnetic field region, using an appropriate expansion for the Schwinger propagator's, we find new renormalons as poles on the real axis of the Borel plane, whose position do not depend on the magnetic field, but where the residues acquire in fact a magnetic dependence. In the strong magnetic limit, working in the lowest Landau level approximation (LLLA), these new poles are not longer present. We compare the magnetic scenario with previous results in the literature concerning thermal effects on renormalons in this theory. |
1405.4868 | Felix Br\"ummer | Felix Brummer, Valerie Domcke and Veronica Sanz | GUT-scale inflation with sizeable tensor modes | 15 pages, 3 figures; v2: matches journal version | JCAP08 (2014) 066 | 10.1088/1475-7516/2014/08/066 | SISSA-21/2014/FISI | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A sizeable tensor-to-scalar ratio, such as recently claimed by BICEP2, would
imply a scale of inflation at the typical scale of supersymmetric grand
unification. This could be an accident, or strong support for supersymmetric
theories. Models of F-term hybrid inflation naturally connect the GUT scale
with the inflationary scale, but they also predict the tensor-to-scalar ratio
to be unmeasurably small. In this work we analyze a general UV embedding of
F-term hybrid inflation into a supergravity theory with a general Kahler
potential. The CMB observables are generated during the early phase of
inflation, at large inflaton values, where the potential is dominated by
Planck-suppressed operators. Tuning the leading higher-order terms can give an
inflaton potential with sizeable tensor fluctuations and a field excursion
which is still sub-Planckian but close to the Planck scale, as expected from
the Lyth bound.
| [
{
"created": "Mon, 19 May 2014 20:00:27 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Sep 2014 08:03:48 GMT",
"version": "v2"
}
] | 2015-06-19 | [
[
"Brummer",
"Felix",
""
],
[
"Domcke",
"Valerie",
""
],
[
"Sanz",
"Veronica",
""
]
] | A sizeable tensor-to-scalar ratio, such as recently claimed by BICEP2, would imply a scale of inflation at the typical scale of supersymmetric grand unification. This could be an accident, or strong support for supersymmetric theories. Models of F-term hybrid inflation naturally connect the GUT scale with the inflationary scale, but they also predict the tensor-to-scalar ratio to be unmeasurably small. In this work we analyze a general UV embedding of F-term hybrid inflation into a supergravity theory with a general Kahler potential. The CMB observables are generated during the early phase of inflation, at large inflaton values, where the potential is dominated by Planck-suppressed operators. Tuning the leading higher-order terms can give an inflaton potential with sizeable tensor fluctuations and a field excursion which is still sub-Planckian but close to the Planck scale, as expected from the Lyth bound. |
hep-ph/0606130 | Sechul Oh | Richard Arnowitt, Bhaskar Dutta, Bo Hu and Sechul Oh | $B_s - \bar B_s$ Mixing and Its Implication for $b \to s$ Transitions in
Supersymmetry | 13 pages, 5 figures | Phys.Lett.B641:305-309,2006 | 10.1016/j.physletb.2006.08.065 | null | hep-ph | null | We investigate the effect of the current measurement of the neutral $B_s$
meson mass difference, $\Delta M_{B_s}$, on SUGRA models which have non-zero
values of the soft breaking terms $(m^2_{LL,RR})_{23}$ and $A^{u,d}_{23}$ at
the GUT scale. We use non-zero values of these parameter to explain the $B\to
K\pi$ puzzle and find that even after satisfying the experimental result on
$\Delta M_{B_s}$ and the branching ratio (BR) of $b\to s\gamma$ we still can
explain the puzzle. Further we show that in this parameter space it is possible
to accommodate the large BR of $B\to \eta' K$ and the current experimental data
for CP asymmetries of $B\to \eta' K^0$ and $B\to \phi K^0$. The predicted value
of $\sin (2\beta^{\rm eff})_{\eta' K^0}$ is about $0.52-0.67$.
| [
{
"created": "Sun, 11 Jun 2006 20:01:41 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Arnowitt",
"Richard",
""
],
[
"Dutta",
"Bhaskar",
""
],
[
"Hu",
"Bo",
""
],
[
"Oh",
"Sechul",
""
]
] | We investigate the effect of the current measurement of the neutral $B_s$ meson mass difference, $\Delta M_{B_s}$, on SUGRA models which have non-zero values of the soft breaking terms $(m^2_{LL,RR})_{23}$ and $A^{u,d}_{23}$ at the GUT scale. We use non-zero values of these parameter to explain the $B\to K\pi$ puzzle and find that even after satisfying the experimental result on $\Delta M_{B_s}$ and the branching ratio (BR) of $b\to s\gamma$ we still can explain the puzzle. Further we show that in this parameter space it is possible to accommodate the large BR of $B\to \eta' K$ and the current experimental data for CP asymmetries of $B\to \eta' K^0$ and $B\to \phi K^0$. The predicted value of $\sin (2\beta^{\rm eff})_{\eta' K^0}$ is about $0.52-0.67$. |
0709.4039 | Gabriel Lopez-Castro | A. Flores-Tlalpa and G. Lopez Castro | (\omega, \phi) P^- decays of tau leptons | 15 pages, 3 figures | Phys.Rev.D77:113011,2008 | 10.1103/PhysRevD.77.113011 | null | hep-ph | null | The \tau -> (\omega, \phi)P^-\nu decays, where P^-=\pi^-, K^-, are considered
within a phenomenological model with dominance of meson intermediate states. We
assume SU(3) flavor symmetry to fix some of the unknown strong interaction
couplings. Our predictions for the \tau -> \phi (\pi^-, K^-)\nu branching
fractions are in good agreement with recent measurements of the BABAR and BELLE
Collaborations.
| [
{
"created": "Tue, 25 Sep 2007 20:59:47 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Flores-Tlalpa",
"A.",
""
],
[
"Castro",
"G. Lopez",
""
]
] | The \tau -> (\omega, \phi)P^-\nu decays, where P^-=\pi^-, K^-, are considered within a phenomenological model with dominance of meson intermediate states. We assume SU(3) flavor symmetry to fix some of the unknown strong interaction couplings. Our predictions for the \tau -> \phi (\pi^-, K^-)\nu branching fractions are in good agreement with recent measurements of the BABAR and BELLE Collaborations. |
hep-ph/0511204 | Manuel Valverde | J. Nieves, M. Valverde, M. J. Vicente Vacas | Inclusive Nucleon Emission Induced by Quasi--Elastic Neutrino--Nucleus
Interactions | 23 pages, 17 figures; Version 2: few typos corrected | Phys.Rev.C73:025504,2006 | 10.1103/PhysRevC.73.025504 | null | hep-ph nucl-th | null | We study the quasi--elastic contribution to the inclusive $(\nu_l,\nu_l N)$,
$(\nu_l,l^- N)$, $({\bar \nu}_l,{\bar \nu}_l N)$ and $({\bar \nu}_l,l^+ N)$
reactions in nuclei using a Monte Carlo simulation method to account for the
rescattering of the outgoing nucleon. As input, we take the reaction
probability from the microscopical many body framework developed in Phys. Rev.
{\bf C70} (2004) 055503 for charged-current induced reactions, while for
neutral currents we use results from a natural extension of the model described
in that reference. The nucleon emission process studied here is a clear signal
for neutral--current neutrino driven reactions, that can be used in the
analysis of future neutrino experiments.
| [
{
"created": "Wed, 16 Nov 2005 19:40:21 GMT",
"version": "v1"
},
{
"created": "Fri, 5 May 2006 15:12:18 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Nieves",
"J.",
""
],
[
"Valverde",
"M.",
""
],
[
"Vacas",
"M. J. Vicente",
""
]
] | We study the quasi--elastic contribution to the inclusive $(\nu_l,\nu_l N)$, $(\nu_l,l^- N)$, $({\bar \nu}_l,{\bar \nu}_l N)$ and $({\bar \nu}_l,l^+ N)$ reactions in nuclei using a Monte Carlo simulation method to account for the rescattering of the outgoing nucleon. As input, we take the reaction probability from the microscopical many body framework developed in Phys. Rev. {\bf C70} (2004) 055503 for charged-current induced reactions, while for neutral currents we use results from a natural extension of the model described in that reference. The nucleon emission process studied here is a clear signal for neutral--current neutrino driven reactions, that can be used in the analysis of future neutrino experiments. |
hep-ph/9705292 | Matthias Neubert | Matthias Neubert (CERN), Berthold Stech (Heidelberg) | Non-Leptonic Weak Decays of B Mesons | two references added and one entry in Table 9 corrected; to appear in
the Second Edition of "Heavy Flavours", edited by A.J. Buras and M. Lindner
(World Scientific, Singapore) | Adv.Ser.Direct.High Energy Phys.15:294-344,1998 | 10.1142/9789812812667_0004 | CERN-TH/97-99, HD-THEP-97-23 | hep-ph | null | We present a detailed study of non-leptonic two-body decays of B mesons based
on a generalized factorization hypothesis. We discuss the structure of
non-factorizable corrections and present arguments in favour of a simple
phenomenological description of their effects. To evaluate the relevant
transition form factors in the factorized decay amplitudes, we use information
extracted from semileptonic decays and incorporate constraints imposed by
heavy-quark symmetry. We discuss tests of the factorization hypothesis and show
how unknown decay constants may be determined from non-leptonic decays. In
particular, we find f_{Ds}=(234+-25) MeV and f_{Ds*}=(271+-33) MeV.
| [
{
"created": "Mon, 12 May 1997 13:04:43 GMT",
"version": "v1"
},
{
"created": "Thu, 22 May 1997 12:52:57 GMT",
"version": "v2"
}
] | 2016-11-03 | [
[
"Neubert",
"Matthias",
"",
"CERN"
],
[
"Stech",
"Berthold",
"",
"Heidelberg"
]
] | We present a detailed study of non-leptonic two-body decays of B mesons based on a generalized factorization hypothesis. We discuss the structure of non-factorizable corrections and present arguments in favour of a simple phenomenological description of their effects. To evaluate the relevant transition form factors in the factorized decay amplitudes, we use information extracted from semileptonic decays and incorporate constraints imposed by heavy-quark symmetry. We discuss tests of the factorization hypothesis and show how unknown decay constants may be determined from non-leptonic decays. In particular, we find f_{Ds}=(234+-25) MeV and f_{Ds*}=(271+-33) MeV. |
1508.03051 | Enrique Fernandez-Martinez | Enrique Fernandez-Martinez, Josu Hernandez-Garcia, Jacobo Lopez-Pavon
and Michele Lucente | Loop level constraints on Seesaw neutrino mixing | 29 pages, 9 eps figures. References added. Accepted in JHEP | JHEP 1510 (2015) 130 | 10.1007/JHEP10(2015)130 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We perform a detailed study of the importance of loop corrections when
deriving bounds on heavy-active neutrino mixing in the context of general
Seesaw mechanisms with extra heavy right-handed neutrinos. We find that, for
low-scale Seesaws with an approximate $B-L$ symmetry characterized by
electroweak scale Majorana masses and large Yukawas, loop corrections could
indeed become relevant in a small part of the parameter space. Previous results
in the literature showed that a partial cancellation between these important
loop corrections and the tree level contributions could relax some constraints
and lead to qualitatively different results upon their inclusion. However, we
find that this cancellation can only take place in presence of large violations
of the $B-L$ symmetry, that lead to unacceptably large contributions to the
light neutrino masses at loop level. Thus, when we restrict our analysis of the
key observables to an approximate $B-L$ symmetry so as to recover the correct
values for neutrino masses, we always find loop corrections to be negligible in
the regions of the parameter space preferred by data.
| [
{
"created": "Wed, 12 Aug 2015 20:08:40 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Oct 2015 15:29:22 GMT",
"version": "v2"
}
] | 2015-10-30 | [
[
"Fernandez-Martinez",
"Enrique",
""
],
[
"Hernandez-Garcia",
"Josu",
""
],
[
"Lopez-Pavon",
"Jacobo",
""
],
[
"Lucente",
"Michele",
""
]
] | We perform a detailed study of the importance of loop corrections when deriving bounds on heavy-active neutrino mixing in the context of general Seesaw mechanisms with extra heavy right-handed neutrinos. We find that, for low-scale Seesaws with an approximate $B-L$ symmetry characterized by electroweak scale Majorana masses and large Yukawas, loop corrections could indeed become relevant in a small part of the parameter space. Previous results in the literature showed that a partial cancellation between these important loop corrections and the tree level contributions could relax some constraints and lead to qualitatively different results upon their inclusion. However, we find that this cancellation can only take place in presence of large violations of the $B-L$ symmetry, that lead to unacceptably large contributions to the light neutrino masses at loop level. Thus, when we restrict our analysis of the key observables to an approximate $B-L$ symmetry so as to recover the correct values for neutrino masses, we always find loop corrections to be negligible in the regions of the parameter space preferred by data. |
1606.00574 | Grigorios Chachamis | F. Caporale, F. G. Celiberto, G. Chachamis, D. Gordo Gomez, A. Sabio
Vera | Inclusive Four-jet Production at 7 and 13 TeV: Azimuthal Profile in
Multi-Regge Kinematics | 19 pages, 8 figures; v2: published version | null | 10.1140/epjc/s10052-016-4557-z | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, new observables in LHC inclusive events with three tagged jets were
proposed. Here, we extend that proposal to events with four tagged jets. The
events are characterised by one jet in the forward direction, one in the
backward direction with a large rapidity distance $Y$ from the first one and
two more jets tagged in more central regions of the detector. In our setup,
non-tagged associated mini-jet multiplicity is present and needs to be
accounted for by the inclusion of BFKL gluon Green functions. The projection of
the cross section on azimuthal-angle components opens up the opportunity for
defining new ratios of correlation functions of the azimuthal angle differences
among the tagged jets that can be used as probes of the BFKL dynamics.
| [
{
"created": "Thu, 2 Jun 2016 08:09:19 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Apr 2017 18:38:33 GMT",
"version": "v2"
}
] | 2017-04-05 | [
[
"Caporale",
"F.",
""
],
[
"Celiberto",
"F. G.",
""
],
[
"Chachamis",
"G.",
""
],
[
"Gomez",
"D. Gordo",
""
],
[
"Vera",
"A. Sabio",
""
]
] | Recently, new observables in LHC inclusive events with three tagged jets were proposed. Here, we extend that proposal to events with four tagged jets. The events are characterised by one jet in the forward direction, one in the backward direction with a large rapidity distance $Y$ from the first one and two more jets tagged in more central regions of the detector. In our setup, non-tagged associated mini-jet multiplicity is present and needs to be accounted for by the inclusion of BFKL gluon Green functions. The projection of the cross section on azimuthal-angle components opens up the opportunity for defining new ratios of correlation functions of the azimuthal angle differences among the tagged jets that can be used as probes of the BFKL dynamics. |
2303.12983 | Shu Tian Eu | George N. Wojcik, Lisa L. Everett, Shu Tian Eu and Ricardo Ximenes | Lepton Flavor Portal Matter | 48 pages, 20 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The paradigm of portal matter represents a well-motivated extension to models
with kinetic mixing/vector portal dark matter. In previous work, we constructed
a simple leptonic portal matter model in which the portal matter fields could
mediate a new physics correction to the anomalous magnetic moment of the muon
consistent with the observed discrepancy between the measured value for this
quantity and the SM prediction. Here, we present a version of this mechanism by
constructing a model with an extended dark gauge sector in which SM and portal
matter fields exist as members of the same dark gauge multiplets, which
provides a natural extension of simple portal matter models. We find a rich
phenomenology in this extended model, including nontrivial novel
characteristics that do not appear in our earlier minimal construction, and
discuss current experimental constraints and future prospects for this model.
We find that a multi-TeV muon collider has excellent prospects for constraining
or measuring the crucial parameters of this model.
| [
{
"created": "Thu, 23 Mar 2023 01:20:26 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Jul 2023 13:21:12 GMT",
"version": "v2"
}
] | 2023-07-12 | [
[
"Wojcik",
"George N.",
""
],
[
"Everett",
"Lisa L.",
""
],
[
"Eu",
"Shu Tian",
""
],
[
"Ximenes",
"Ricardo",
""
]
] | The paradigm of portal matter represents a well-motivated extension to models with kinetic mixing/vector portal dark matter. In previous work, we constructed a simple leptonic portal matter model in which the portal matter fields could mediate a new physics correction to the anomalous magnetic moment of the muon consistent with the observed discrepancy between the measured value for this quantity and the SM prediction. Here, we present a version of this mechanism by constructing a model with an extended dark gauge sector in which SM and portal matter fields exist as members of the same dark gauge multiplets, which provides a natural extension of simple portal matter models. We find a rich phenomenology in this extended model, including nontrivial novel characteristics that do not appear in our earlier minimal construction, and discuss current experimental constraints and future prospects for this model. We find that a multi-TeV muon collider has excellent prospects for constraining or measuring the crucial parameters of this model. |
1906.09002 | Zhenyang Wang | Zhen-Yang Wang, Jing-Juan Qi, Qi-Xin Yu, Xin-Heng Guo | $B_{s1}(5778)$ as a $B^*\bar{K}$ molecule in the Bethe-Salpeter equation
approach | null | Phys. Rev. D 100, 096009 (2019) | 10.1103/PhysRevD.100.096009 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We interpret the $B_{s1}(5778)$ as an $S$-wave $B^\ast\bar{K}$ molecular
state in the Bethe-Salpeter equation approach. In the ladder and instantaneous
approximations, and with the kernel containing one-particle-exchange diagrams
and introducing three different form factors (monopole, dipole, and exponential
form factors) in the vertex, we find the bound state exists. We also study the
decay widths of the decay $B_{s1}(5778)\rightarrow B_s^\ast\pi$ and the
radiative decays $B_{s1}(5778)\rightarrow B_s\gamma$ and
$B_{s1}(5778)\rightarrow B_s^{\ast}\gamma$, which will be instructive for the
forthcoming experiments.
| [
{
"created": "Fri, 21 Jun 2019 08:23:19 GMT",
"version": "v1"
},
{
"created": "Fri, 25 Oct 2019 01:21:14 GMT",
"version": "v2"
}
] | 2019-11-20 | [
[
"Wang",
"Zhen-Yang",
""
],
[
"Qi",
"Jing-Juan",
""
],
[
"Yu",
"Qi-Xin",
""
],
[
"Guo",
"Xin-Heng",
""
]
] | We interpret the $B_{s1}(5778)$ as an $S$-wave $B^\ast\bar{K}$ molecular state in the Bethe-Salpeter equation approach. In the ladder and instantaneous approximations, and with the kernel containing one-particle-exchange diagrams and introducing three different form factors (monopole, dipole, and exponential form factors) in the vertex, we find the bound state exists. We also study the decay widths of the decay $B_{s1}(5778)\rightarrow B_s^\ast\pi$ and the radiative decays $B_{s1}(5778)\rightarrow B_s\gamma$ and $B_{s1}(5778)\rightarrow B_s^{\ast}\gamma$, which will be instructive for the forthcoming experiments. |
hep-ph/0212289 | Holger Mueller | Holger Mueller, Claus Braxmaier, Sven Herrmann, Achim Peters, and
Claus Laemmerzahl | Electromagnetic cavities and Lorentz invariance violation | 7 pages, 2 figures, 1 table | Phys.Rev. D67 (2003) 056006 | 10.1103/PhysRevD.67.056006 | null | hep-ph | null | Within the model of a Lorentz violating extension of the Maxwell sector of
the standard model, modified light propagation leads to a change of the
resonance frequency of an electromagnetic cavity, allowing cavity tests of
Lorentz violation. However, the frequency is also affected by a
material-dependent length change of the cavity due to a modified Coulomb
potential arising from the same Lorentz violation as well. We derive the
frequency change of the cavity taking both into account. The new effects
derived are negligible for present experiments, but will be more pronounced in
future tests using novel resonator materials.
| [
{
"created": "Thu, 19 Dec 2002 14:06:09 GMT",
"version": "v1"
},
{
"created": "Sat, 29 Mar 2003 17:00:20 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Mueller",
"Holger",
""
],
[
"Braxmaier",
"Claus",
""
],
[
"Herrmann",
"Sven",
""
],
[
"Peters",
"Achim",
""
],
[
"Laemmerzahl",
"Claus",
""
]
] | Within the model of a Lorentz violating extension of the Maxwell sector of the standard model, modified light propagation leads to a change of the resonance frequency of an electromagnetic cavity, allowing cavity tests of Lorentz violation. However, the frequency is also affected by a material-dependent length change of the cavity due to a modified Coulomb potential arising from the same Lorentz violation as well. We derive the frequency change of the cavity taking both into account. The new effects derived are negligible for present experiments, but will be more pronounced in future tests using novel resonator materials. |
2110.08274 | Stefano Forte | Richard D. Ball, Stefano Forte and Roy Stegeman | Correlation and Combination of Sets of Parton Distributions | 21 pages, 9 figures. Final version published in EPJC: clarifications
on data replicas and functional uncertainties added, typos corrected,
references updated | null | null | Edinburgh 2021/19, TIF-UNIMI-2021-5 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the correlation between different sets of parton distributions
(PDFs). Specifically, viewing different PDF sets as distinct determinations,
generally correlated, of the same underlying physical quantity, we examine the
extent to which the correlation between them is due to the underlying data. We
do this both for pairs of PDF sets determined using a given fixed methodology,
and between sets determined using different methodologies. We show that
correlations have a sizable component that is not due to the underlying data,
because the data do not determine the PDF uniquely. We show that the
data-driven correlations can be used to assess the efficiency of methodologies
used for PDF determination. We also show that the use of data-driven
correlations for the combination of different PDFs into a joint set can lead to
inconsistent results, and thus that the statistical combination used in
constructing the widely used PDF4LHC15 PDF set remains the most reliable
method.
| [
{
"created": "Fri, 15 Oct 2021 18:00:00 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Dec 2021 11:39:31 GMT",
"version": "v2"
}
] | 2021-12-09 | [
[
"Ball",
"Richard D.",
""
],
[
"Forte",
"Stefano",
""
],
[
"Stegeman",
"Roy",
""
]
] | We study the correlation between different sets of parton distributions (PDFs). Specifically, viewing different PDF sets as distinct determinations, generally correlated, of the same underlying physical quantity, we examine the extent to which the correlation between them is due to the underlying data. We do this both for pairs of PDF sets determined using a given fixed methodology, and between sets determined using different methodologies. We show that correlations have a sizable component that is not due to the underlying data, because the data do not determine the PDF uniquely. We show that the data-driven correlations can be used to assess the efficiency of methodologies used for PDF determination. We also show that the use of data-driven correlations for the combination of different PDFs into a joint set can lead to inconsistent results, and thus that the statistical combination used in constructing the widely used PDF4LHC15 PDF set remains the most reliable method. |
0711.2635 | Elizabeth Werbos | Elizabeth S. Werbos | The chiral condensate in a constant electromagnetic field at O(p^6) | 7 pages, 4 figures | Phys.Rev.C77:065202,2008 | 10.1103/PhysRevC.77.065202 | null | hep-ph | null | We examine the shift in the chiral condensate due to a constant
electromagnetic field at ${\cal O}(p^6)$ using SU(2) chiral perturbation theory
and a realistic $M_\pi = 140 \textrm{MeV}$. We find that this value differs
significantly from the value calculated using $M_\pi = 0$, while the magnitude
of the two-loop correction is unclear due to the uncertainty in the
experimentally determined value of the relevant ${\cal L}_6$ LEC.
| [
{
"created": "Fri, 16 Nov 2007 15:16:34 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Werbos",
"Elizabeth S.",
""
]
] | We examine the shift in the chiral condensate due to a constant electromagnetic field at ${\cal O}(p^6)$ using SU(2) chiral perturbation theory and a realistic $M_\pi = 140 \textrm{MeV}$. We find that this value differs significantly from the value calculated using $M_\pi = 0$, while the magnitude of the two-loop correction is unclear due to the uncertainty in the experimentally determined value of the relevant ${\cal L}_6$ LEC. |
hep-ph/9508273 | null | H. M. Asatrian, A. N. Ioannisian | The Neutrino Masses in SUSY GUT | Latex file, 14 pages | Phys.Atom.Nucl. 59 (1996) 1768-1773; Yad.Fiz. 59N10 (1996)
1831-1836 | null | YerPhI 1450(20)-95 | hep-ph | null | The neutrino mass problem in $SU(4) \times SU(2)_{L} \times SU(2)_{R}$ SUSY
GUT obtained from the compactification of $E_{8} \times E_{8}$ heterotic string
is analyzed. The estimated values of the neutrino masses and mixing angles can
explain the experimental data on solar neutrino flux.
| [
{
"created": "Wed, 9 Aug 1995 15:33:52 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Asatrian",
"H. M.",
""
],
[
"Ioannisian",
"A. N.",
""
]
] | The neutrino mass problem in $SU(4) \times SU(2)_{L} \times SU(2)_{R}$ SUSY GUT obtained from the compactification of $E_{8} \times E_{8}$ heterotic string is analyzed. The estimated values of the neutrino masses and mixing angles can explain the experimental data on solar neutrino flux. |
hep-ph/9507386 | null | U. Chattopadhyay, Pran Nath (Northeastern University, Boston) | Probing Supergravity Grand Unification in the Brookhaven g-2 Experiment | 27 pages, Latex, uuencoded figure file to be obtained and processed
separately for two figures. Figures may also be sent on request by mail | Phys.Rev.D53:1648-1657,1996 | 10.1103/PhysRevD.53.1648 | NSF-ITP-95-64, NUB-TH-3125/95 | hep-ph | null | A quantitative analysis of $\amu\equiv{1\over 2}(g-2)_\mu$ within the
framework of Supergravity Grand Unification and radiative breaking of the
electro-weak symmetry is given. It is found that $a_{\mu}^{SUSY}$ is dominated
by the chiral interference term from the light chargino exchange, and that this
term carries a signature which correlates strongly with the sign of $\mu$. Thus
as a rule $a_{\mu}^{SUSY}>0$ for $\mu>0$ and $a_{\mu}^{SUSY}<0$ for $\mu<0$
with very few exceptions when tan$\beta\sim 1$. At the quantitative level it is
shown that if the E821 BNL experiment can reach the expected sensitivity of
$4\times 10^{-10}$ and there is a reduction in the hadronic error by a factor
of four or more, then the experiment will explore a majority of the parameter
space in $ m_0-m_{\tilde g}$ plane in the region $m_0\lsim 400$ GeV, $m_{\tilde
g}\lsim 700$ GeV for $\tanbeta \gsim 10$ assuming the experiment will not
discard the Standard Model result within its $2\sigma$ uncertainty limit. For
smaller $\tanbeta$, the SUSY reach of E821 will still be considerable. Further,
if no effect within $2 \sigma$ limit of the Standard Model value is seen, then
large $\tanbeta$ scenarios will be severely constrained within the current
naturalness criterion, ie., $m_0, m_{\tilde g}\lsim 1$ TeV.
| [
{
"created": "Sun, 23 Jul 1995 22:30:17 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Jul 1995 05:03:05 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Chattopadhyay",
"U.",
"",
"Northeastern University, Boston"
],
[
"Nath",
"Pran",
"",
"Northeastern University, Boston"
]
] | A quantitative analysis of $\amu\equiv{1\over 2}(g-2)_\mu$ within the framework of Supergravity Grand Unification and radiative breaking of the electro-weak symmetry is given. It is found that $a_{\mu}^{SUSY}$ is dominated by the chiral interference term from the light chargino exchange, and that this term carries a signature which correlates strongly with the sign of $\mu$. Thus as a rule $a_{\mu}^{SUSY}>0$ for $\mu>0$ and $a_{\mu}^{SUSY}<0$ for $\mu<0$ with very few exceptions when tan$\beta\sim 1$. At the quantitative level it is shown that if the E821 BNL experiment can reach the expected sensitivity of $4\times 10^{-10}$ and there is a reduction in the hadronic error by a factor of four or more, then the experiment will explore a majority of the parameter space in $ m_0-m_{\tilde g}$ plane in the region $m_0\lsim 400$ GeV, $m_{\tilde g}\lsim 700$ GeV for $\tanbeta \gsim 10$ assuming the experiment will not discard the Standard Model result within its $2\sigma$ uncertainty limit. For smaller $\tanbeta$, the SUSY reach of E821 will still be considerable. Further, if no effect within $2 \sigma$ limit of the Standard Model value is seen, then large $\tanbeta$ scenarios will be severely constrained within the current naturalness criterion, ie., $m_0, m_{\tilde g}\lsim 1$ TeV. |
1601.06761 | Ufuk Aydemir | Ufuk Aydemir, Tanumoy Mandal | LHC probes of TeV-scale scalars in $\mathrm{SO}(10)$ grand unification | 12 pages, 7 figures, 2 tables. Improved draft by adding new figures
and discussions. Accepted version in Advances in High Energy Physics | Adv.High Energy Phys. 2017 (2017) 7498795 | 10.1155/2017/7498795 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the possibility of TeV-scale scalars as low energy remnants
arising in the non-supersymmetric $\mathrm{SO}(10)$ grand unification framework
where the field content is minimal. We consider a scenario where the
$\mathrm{SO}(10)$ gauge symmetry is broken into the gauge symmetry of the
Standard Model (SM) through multiple stages of symmetry breaking, and a colored
and hypercharged scalar $\chi$ picks a TeV-scale mass in the process. The last
stage of the symmetry breaking occurs at the TeV scale where the left-right
symmetry, i.e. $\mathrm{SU}(2)_L\otimes \mathrm{SU}(2)_R\otimes
\mathrm{U}(1)_{B-L}\otimes \mathrm{SU}(3)_C$, is broken into that of the SM by
a singlet scalar field $\mathcal{S}$ of mass $M_{\mathcal{S}}\sim 1$ TeV, which
is a component of an $\mathrm{SU}(2)_R$-triplet scalar field, acquiring a
TeV-scale vacuum expectation value. For the LHC phenomenology, we consider a
scenario where $\mathcal{S}$ is produced via gluon-gluon fusion through loop
interactions with $\chi$ and also decays to a pair of SM gauge bosons through
$\chi$ in the loop. We find that the parameter space is heavily constrained
from the latest LHC data. We use a multivariate analysis to estimate the LHC
discovery reach of $\mathcal{S}$ into the diphoton channel.
| [
{
"created": "Mon, 25 Jan 2016 20:37:10 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Feb 2016 13:57:29 GMT",
"version": "v2"
},
{
"created": "Mon, 24 Oct 2016 12:39:19 GMT",
"version": "v3"
},
{
"created": "Mon, 24 Apr 2017 18:24:45 GMT",
"version": "v4"
}
] | 2017-06-01 | [
[
"Aydemir",
"Ufuk",
""
],
[
"Mandal",
"Tanumoy",
""
]
] | We investigate the possibility of TeV-scale scalars as low energy remnants arising in the non-supersymmetric $\mathrm{SO}(10)$ grand unification framework where the field content is minimal. We consider a scenario where the $\mathrm{SO}(10)$ gauge symmetry is broken into the gauge symmetry of the Standard Model (SM) through multiple stages of symmetry breaking, and a colored and hypercharged scalar $\chi$ picks a TeV-scale mass in the process. The last stage of the symmetry breaking occurs at the TeV scale where the left-right symmetry, i.e. $\mathrm{SU}(2)_L\otimes \mathrm{SU}(2)_R\otimes \mathrm{U}(1)_{B-L}\otimes \mathrm{SU}(3)_C$, is broken into that of the SM by a singlet scalar field $\mathcal{S}$ of mass $M_{\mathcal{S}}\sim 1$ TeV, which is a component of an $\mathrm{SU}(2)_R$-triplet scalar field, acquiring a TeV-scale vacuum expectation value. For the LHC phenomenology, we consider a scenario where $\mathcal{S}$ is produced via gluon-gluon fusion through loop interactions with $\chi$ and also decays to a pair of SM gauge bosons through $\chi$ in the loop. We find that the parameter space is heavily constrained from the latest LHC data. We use a multivariate analysis to estimate the LHC discovery reach of $\mathcal{S}$ into the diphoton channel. |
1007.1321 | Dirk Zerwas | Dirk Zerwas | Measuring Supersymmetry | 84 pages, 44 Figures (reduced resolution), Habilitation Dec 11, 2009 | null | null | LAL 09-218 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Supersymmetry is an attractive extension of the standard model of particle
physics. It associates to every bosonic degree of freedom a fermionic one and
vice versa. Supersymmetry unifies the coupling constants of the
electromagnetic, weak and strong forces at a high scale and provides a
candidate for the elusive dark matter. Supersymmetry could be discovered at the
LHC, the proton--proton collider at CERN which has started operations in 2008.
The LHC is foreseen to have a center--of--mass energy of 14~TeV, opening up a
new mass range to be explored to search for supersymmetric particles with the
ATLAS and CMS experiments. The development and production of electronics for
these detectors has been a challenge, e.g. for the readout board for the
electromagnetic calorimeter. Reconstructing the physics events with the best
precision, in particular the reconstruction and identification of electrons and
photons in the large QCD background has been prepared in extensive test beam
studies and Monte Carlo simulations. If the Higgs boson and supersymmetry are
discovered, the properties of the (s)particles such as the masses, branching
ratios must be measured precisely, either at the LHC or at a future e+e- linear
collider. The SFitter project aims to determine the underlying theoretical
model parameters from the correlated experimental measurements including
theoretical errors. The methods are applied to the extraction of the
fundamental parameters of supersymmetry as well the measurement of the Higgs
boson couplings at the LHC. The extrapolation of the supersymmetric parameters
from the weak scale to the Grand Unification Scale could provide the basis
towards the inclusion of gravity.
| [
{
"created": "Thu, 8 Jul 2010 09:26:13 GMT",
"version": "v1"
}
] | 2010-07-09 | [
[
"Zerwas",
"Dirk",
""
]
] | Supersymmetry is an attractive extension of the standard model of particle physics. It associates to every bosonic degree of freedom a fermionic one and vice versa. Supersymmetry unifies the coupling constants of the electromagnetic, weak and strong forces at a high scale and provides a candidate for the elusive dark matter. Supersymmetry could be discovered at the LHC, the proton--proton collider at CERN which has started operations in 2008. The LHC is foreseen to have a center--of--mass energy of 14~TeV, opening up a new mass range to be explored to search for supersymmetric particles with the ATLAS and CMS experiments. The development and production of electronics for these detectors has been a challenge, e.g. for the readout board for the electromagnetic calorimeter. Reconstructing the physics events with the best precision, in particular the reconstruction and identification of electrons and photons in the large QCD background has been prepared in extensive test beam studies and Monte Carlo simulations. If the Higgs boson and supersymmetry are discovered, the properties of the (s)particles such as the masses, branching ratios must be measured precisely, either at the LHC or at a future e+e- linear collider. The SFitter project aims to determine the underlying theoretical model parameters from the correlated experimental measurements including theoretical errors. The methods are applied to the extraction of the fundamental parameters of supersymmetry as well the measurement of the Higgs boson couplings at the LHC. The extrapolation of the supersymmetric parameters from the weak scale to the Grand Unification Scale could provide the basis towards the inclusion of gravity. |
1803.08506 | Vedran Brdar | Jeffrey M. Berryman, Vedran Brdar, Patrick Huber | Particle physics origin of the 5 MeV bump in the reactor antineutrino
spectrum? | 13 pages, 5 figures, matches published version | Phys. Rev. D 99, 055045 (2019) | 10.1103/PhysRevD.99.055045 | null | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | One of the most puzzling questions in neutrino physics is the origin of the
excess at 5 MeV in the reactor antineutrino spectrum. In this paper, we explore
the excess via the reaction $^{13}$C$(\overline{\nu}, \overline{\nu}^\prime
n)^{12}$C$^*$ in organic scintillator detectors. The de-excitation of
$^{12}$C$^*$ yields a prompt $4.4$ MeV photon, while the thermalization of the
product neutron causes proton recoils, which in turn yield an additional prompt
energy contribution with finite width. Together, these effects can mimic an
inverse beta decay event with around 5 MeV energy. We consider several
non-standard neutrino interactions to produce such a process and find that the
parameter space preferred by Daya Bay is disfavored by measurements of
neutrino-induced deuteron disintegration and coherent elastic neutrino-nucleus
scattering. While non-minimal particle physics scenarios may be viable, a
nuclear physics solution to this anomaly appears more appealing.
| [
{
"created": "Thu, 22 Mar 2018 18:00:01 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Mar 2019 20:45:39 GMT",
"version": "v2"
}
] | 2019-04-01 | [
[
"Berryman",
"Jeffrey M.",
""
],
[
"Brdar",
"Vedran",
""
],
[
"Huber",
"Patrick",
""
]
] | One of the most puzzling questions in neutrino physics is the origin of the excess at 5 MeV in the reactor antineutrino spectrum. In this paper, we explore the excess via the reaction $^{13}$C$(\overline{\nu}, \overline{\nu}^\prime n)^{12}$C$^*$ in organic scintillator detectors. The de-excitation of $^{12}$C$^*$ yields a prompt $4.4$ MeV photon, while the thermalization of the product neutron causes proton recoils, which in turn yield an additional prompt energy contribution with finite width. Together, these effects can mimic an inverse beta decay event with around 5 MeV energy. We consider several non-standard neutrino interactions to produce such a process and find that the parameter space preferred by Daya Bay is disfavored by measurements of neutrino-induced deuteron disintegration and coherent elastic neutrino-nucleus scattering. While non-minimal particle physics scenarios may be viable, a nuclear physics solution to this anomaly appears more appealing. |
hep-ph/9901399 | null | Harry J. Lipkin (Weizmann, Tel Aviv, Argonne) | Quantum Mechanics of Neutrino Oscillations - Hand Waving for Pedestrians | 46 pages | null | null | WIS-98/31/Dec-DPP, TAUP 2537-98, ANL-HEP-CP-98-126 | hep-ph | null | Why Hand Waving? All calculations in books describe oscillations in time. But
real experiments don't measure time. Hand waving is used to convert the results
of a "gedanken time experiment" to the result of a real experiment measuring
oscillations in space. Right hand waving gives the right answer; wrong hand
waving gives the wrong answer. Many papers use wrong handwaving to get wrong
answers. This talk explains how to do it right and also answers the following
questions:
1. A neutrino which is a mixture of two mass eigenstates is emitted with muon
in the decay of a pion at rest. This is a a "missing mass experiment" where the
muon energy determines the neutrino mass. Why are the two mass states coherent?
2. A neutrino which is a mixture of two mass eigenstates is emitted at time
t=0. The two mass eigenstates move with different velocities and arrive at the
detector at different times. Why are the two mass states coherent?
3. A neutrino is a mixture of two overlapping wave packets with different
masses moving with different velocities. Will the wave packets eventually
separate? If yes, when?
| [
{
"created": "Mon, 25 Jan 1999 10:27:04 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Lipkin",
"Harry J.",
"",
"Weizmann, Tel Aviv, Argonne"
]
] | Why Hand Waving? All calculations in books describe oscillations in time. But real experiments don't measure time. Hand waving is used to convert the results of a "gedanken time experiment" to the result of a real experiment measuring oscillations in space. Right hand waving gives the right answer; wrong hand waving gives the wrong answer. Many papers use wrong handwaving to get wrong answers. This talk explains how to do it right and also answers the following questions: 1. A neutrino which is a mixture of two mass eigenstates is emitted with muon in the decay of a pion at rest. This is a a "missing mass experiment" where the muon energy determines the neutrino mass. Why are the two mass states coherent? 2. A neutrino which is a mixture of two mass eigenstates is emitted at time t=0. The two mass eigenstates move with different velocities and arrive at the detector at different times. Why are the two mass states coherent? 3. A neutrino is a mixture of two overlapping wave packets with different masses moving with different velocities. Will the wave packets eventually separate? If yes, when? |
0812.1460 | Laura Tolos | Laura Tolos, Daniel Cabrera, Daniel Gamermann, Tetsuro Mizutani,
Raquel Molina, Eulogio Oset and Angels Ramos | Strangeness and charm at FAIR | 5 pages, 4 figures, to appear in Proceedings of Quark Confinement and
the Hadron Spectrum 8 Conference (Confinement8), Mainz (Germany), September
1-6, 2008 | PoS Confinement8:107,2008 | null | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the properties of strange and charm mesons in hot and dense matter
within a self-consistent coupled-channel approach for the experimental
conditions of density and temperature expected for the CBM experiment at
FAIR/GSI. The in-medium solution at finite temperature accounts for Pauli
blocking effects, mean-field binding on all the baryons involved, and meson
self-energies. In the strange sector, the $\bar K$ spectral function spreads
over a wide range of energies, reflecting the melting of the $\Lambda (1405)$
resonance and the contribution of $(\Lambda,\Sigma,\Sigma^*)N^{-1}$ components
at finite temperature. In the case of charm mesons, the dynamically-generated
$\Lambda_c(2593)$ and $\Sigma_c(2880)$ resonances remain close to their
free-space position while acquiring a remarkable width. As a result, the $D$
meson spectral density shows a single pronounced peak for energies close to the
$D$ meson free-space mass that broadens with increasing matter density with an
extended tail particularly towards lower energies. We also discuss the
implications for the $D_{s0}(2317)$, $D_0(2400)$ and the predicted X(3700)
resonances at FAIR energies.
| [
{
"created": "Mon, 8 Dec 2008 12:13:56 GMT",
"version": "v1"
}
] | 2009-06-25 | [
[
"Tolos",
"Laura",
""
],
[
"Cabrera",
"Daniel",
""
],
[
"Gamermann",
"Daniel",
""
],
[
"Mizutani",
"Tetsuro",
""
],
[
"Molina",
"Raquel",
""
],
[
"Oset",
"Eulogio",
""
],
[
"Ramos",
"Angels",
""
]
] | We study the properties of strange and charm mesons in hot and dense matter within a self-consistent coupled-channel approach for the experimental conditions of density and temperature expected for the CBM experiment at FAIR/GSI. The in-medium solution at finite temperature accounts for Pauli blocking effects, mean-field binding on all the baryons involved, and meson self-energies. In the strange sector, the $\bar K$ spectral function spreads over a wide range of energies, reflecting the melting of the $\Lambda (1405)$ resonance and the contribution of $(\Lambda,\Sigma,\Sigma^*)N^{-1}$ components at finite temperature. In the case of charm mesons, the dynamically-generated $\Lambda_c(2593)$ and $\Sigma_c(2880)$ resonances remain close to their free-space position while acquiring a remarkable width. As a result, the $D$ meson spectral density shows a single pronounced peak for energies close to the $D$ meson free-space mass that broadens with increasing matter density with an extended tail particularly towards lower energies. We also discuss the implications for the $D_{s0}(2317)$, $D_0(2400)$ and the predicted X(3700) resonances at FAIR energies. |
hep-ph/0410264 | BingAn Li | Bing An Li | Is X(3872) a possible candidate of hybrid meson | 13 pages | Phys.Lett.B605:306-310,2005 | 10.1016/j.physletb.2004.11.062 | null | hep-ph | null | The associate productions of X(3872) and J/\psi in hadron collisions and
flavor independence of hadrons in ee^+\to X(3872)+hadrons and the decays
X(3872)\to \gamma+hadrons are discussed. It is pointed out X(3872)\to
J/\psi+\sigma could be a significant decay channel.
| [
{
"created": "Tue, 19 Oct 2004 15:03:11 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Li",
"Bing An",
""
]
] | The associate productions of X(3872) and J/\psi in hadron collisions and flavor independence of hadrons in ee^+\to X(3872)+hadrons and the decays X(3872)\to \gamma+hadrons are discussed. It is pointed out X(3872)\to J/\psi+\sigma could be a significant decay channel. |
1912.00422 | Zuowei Liu | Mingxuan Du, Zuowei Liu, Van Que Tran | Enhanced Long-Lived Dark Photon Signals at the LHC | 10 pages, 11 figures; v2: JHEP version | null | 10.1007/JHEP05(2020)055 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct a model in which the standard model is extended by a hidden
sector with two gauge $U(1)$ bosons. A Dirac fermion $\psi$ charged under both
$U(1)$ fields is introduced in the hidden sector which can be a subcomponent of
the dark matter in the Universe. Stueckelberg mass terms between the two new
gauge $U(1)$ fields and the hypercharge gauge boson mediate the interactions
between the standard model sector and the hidden sector. A remarkable collider
signature of this model is the enhanced long-lived dark photon events at the
LHC than the conventional dark photon models; the long-lived dark photons in
the model can be discriminated from the background by measuring the time delay
signal in the precision timing detectors which are proposed to be installed in
the LHC upgrades and have an ${\cal O} (10)$ pico-second detection efficiency.
Searches with current LHCb data are also investigated. Various experimental
constraints on the model including collider constraints and cosmological
constraints are also discussed.
| [
{
"created": "Sun, 1 Dec 2019 15:03:42 GMT",
"version": "v1"
},
{
"created": "Fri, 22 Dec 2023 23:57:05 GMT",
"version": "v2"
}
] | 2023-12-27 | [
[
"Du",
"Mingxuan",
""
],
[
"Liu",
"Zuowei",
""
],
[
"Tran",
"Van Que",
""
]
] | We construct a model in which the standard model is extended by a hidden sector with two gauge $U(1)$ bosons. A Dirac fermion $\psi$ charged under both $U(1)$ fields is introduced in the hidden sector which can be a subcomponent of the dark matter in the Universe. Stueckelberg mass terms between the two new gauge $U(1)$ fields and the hypercharge gauge boson mediate the interactions between the standard model sector and the hidden sector. A remarkable collider signature of this model is the enhanced long-lived dark photon events at the LHC than the conventional dark photon models; the long-lived dark photons in the model can be discriminated from the background by measuring the time delay signal in the precision timing detectors which are proposed to be installed in the LHC upgrades and have an ${\cal O} (10)$ pico-second detection efficiency. Searches with current LHCb data are also investigated. Various experimental constraints on the model including collider constraints and cosmological constraints are also discussed. |
hep-ph/9912425 | Andrey Onishenko | A.K. Likhoded (IHEP), A.I. Onishchenko (ITEP) | Lifetimes of doubly heavy baryons | 21 pages, 9 figures | null | null | null | hep-ph | null | We perform a detailed investigation of total lifetimes for the doubly heavy
baryons $\Xi_{QQ'}$, $\Omega_{QQ'}$ in the framework of operator product
expansion over the inverse heavy quark mass, whereas, to estimate matrix
elements of operators obtained in OPE, approximations of nonrelativistic QCD
are used.
| [
{
"created": "Mon, 20 Dec 1999 14:03:24 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Likhoded",
"A. K.",
"",
"IHEP"
],
[
"Onishchenko",
"A. I.",
"",
"ITEP"
]
] | We perform a detailed investigation of total lifetimes for the doubly heavy baryons $\Xi_{QQ'}$, $\Omega_{QQ'}$ in the framework of operator product expansion over the inverse heavy quark mass, whereas, to estimate matrix elements of operators obtained in OPE, approximations of nonrelativistic QCD are used. |
hep-ph/0603028 | Gabriela Barenboim | G.Barenboim, N.E.mavromatos, S.Sarkar and A.Waldron-Lauda | Quantum decoherence and neutrino data | 27 pages, 2 figures | Nucl.Phys. B758 (2006) 90-111 | 10.1016/j.nuclphysb.2006.09.012 | null | hep-ph | null | In this work we perform global fits of microscopic decoherence models of
neutrinos to all available current data, including LSND and KamLAND spectral
distortion results. In previous works on related issues the models used were
supposed to explain LSND results by means of quantum gravity induced
decoherence. However those models were purely phenomenological without any
underlying microscopic basis. It is one of the main purposes of this article to
use detailed microscopic decoherence models with complete positivity, to fit
the data.The decoherence in these models has contributions not only from
stochastic quantum gravity vacua operating as a medium, but also from
conventional uncertainties in the energy of the (anti)neutrino beam. All these
contributions lead to oscillation-length independent damping factors modulating
the oscillatory terms from which one obtains an excellent fit to all available
neutrino data, including LSND and Kamland spectral distortion.
| [
{
"created": "Fri, 3 Mar 2006 13:34:22 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Barenboim",
"G.",
""
],
[
"mavromatos",
"N. E.",
""
],
[
"Sarkar",
"S.",
""
],
[
"Waldron-Lauda",
"A.",
""
]
] | In this work we perform global fits of microscopic decoherence models of neutrinos to all available current data, including LSND and KamLAND spectral distortion results. In previous works on related issues the models used were supposed to explain LSND results by means of quantum gravity induced decoherence. However those models were purely phenomenological without any underlying microscopic basis. It is one of the main purposes of this article to use detailed microscopic decoherence models with complete positivity, to fit the data.The decoherence in these models has contributions not only from stochastic quantum gravity vacua operating as a medium, but also from conventional uncertainties in the energy of the (anti)neutrino beam. All these contributions lead to oscillation-length independent damping factors modulating the oscillatory terms from which one obtains an excellent fit to all available neutrino data, including LSND and Kamland spectral distortion. |
1712.09146 | Jens Erler | Jens Erler and Rodolfo Ferro-Hern\'andez | Weak Mixing Angle in the Thomson Limit | 22 pages, 3 figures; one formula extended with corresponding very
small numerical changes; one table and four references added | null | 10.1007/JHEP03(2018)196 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a calculation of the weak mixing angle in the $\overline{\rm\small
MS}$ renormalization scheme which is relevant for experiments performed at very
low energies or momentum transfers. We include higher orders in the
perturbative QCD expansion, as well as updated phenomenological and theoretical
input, and obtain the result $\sin^{2}{\theta}_W(0) = 0.23868(5)(2)$ for the
reference values $\alpha_s(M_Z) = 0.1182$ and $m_c(m_c) = 1.272$ GeV. The first
quoted error is from the current Standard Model evaluation of the mixing angle
at the $Z$ boson mass scale. The second error represents the theoretical and
parametric uncertainties induced by the evolution to the Thomson limit and is
discussed in detail.
| [
{
"created": "Mon, 25 Dec 2017 23:55:59 GMT",
"version": "v1"
},
{
"created": "Thu, 15 Mar 2018 23:35:33 GMT",
"version": "v2"
}
] | 2020-05-20 | [
[
"Erler",
"Jens",
""
],
[
"Ferro-Hernández",
"Rodolfo",
""
]
] | We present a calculation of the weak mixing angle in the $\overline{\rm\small MS}$ renormalization scheme which is relevant for experiments performed at very low energies or momentum transfers. We include higher orders in the perturbative QCD expansion, as well as updated phenomenological and theoretical input, and obtain the result $\sin^{2}{\theta}_W(0) = 0.23868(5)(2)$ for the reference values $\alpha_s(M_Z) = 0.1182$ and $m_c(m_c) = 1.272$ GeV. The first quoted error is from the current Standard Model evaluation of the mixing angle at the $Z$ boson mass scale. The second error represents the theoretical and parametric uncertainties induced by the evolution to the Thomson limit and is discussed in detail. |
1704.08911 | James Cline | James M. Cline | Is electroweak baryogenesis dead? | 10 pages, 7 figures. Talk presented at Moriond Electroweak (24 Mar.
2017) and Higgs Cosmology workshop, Kavli Royal Society Centre, Chichley
Hall, UK (28 Mar. 2017); v2: added discussion of bubble wall shape and
velocity and references; published version | null | 10.1098/rsta.2017.0116 | CERN-TH-2017-096 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Electroweak baryogenesis is severely challenged in its traditional settings:
the Minimal Supersymmetric Standard Model, and in more general two Higgs
doublet models. Fine tuning of parameters is required, or large couplings
leading to a Landau pole at scales just above the new physics introduced. The
situation is somewhat better in models with a singlet scalar coupling to the
Higgs so as to give a strongly first order phase transition due to a tree-level
barrier, but even in this case no UV complete models had been demonstrated to
give successful baryogenesis. Here we point out some directions that overcome
this limitation, by introducing a new source of CP violation in the couplings
of the singlet field. A model of electroweak baryogenesis requiring no fine
tuning and consistent to scales far above 1 TeV is demonstrated, in which dark
matter plays the leading role in creating a CP asymmetry that is the source of
the baryon asymmetry.
| [
{
"created": "Fri, 28 Apr 2017 13:03:19 GMT",
"version": "v1"
},
{
"created": "Mon, 17 Jul 2017 17:10:26 GMT",
"version": "v2"
}
] | 2017-07-18 | [
[
"Cline",
"James M.",
""
]
] | Electroweak baryogenesis is severely challenged in its traditional settings: the Minimal Supersymmetric Standard Model, and in more general two Higgs doublet models. Fine tuning of parameters is required, or large couplings leading to a Landau pole at scales just above the new physics introduced. The situation is somewhat better in models with a singlet scalar coupling to the Higgs so as to give a strongly first order phase transition due to a tree-level barrier, but even in this case no UV complete models had been demonstrated to give successful baryogenesis. Here we point out some directions that overcome this limitation, by introducing a new source of CP violation in the couplings of the singlet field. A model of electroweak baryogenesis requiring no fine tuning and consistent to scales far above 1 TeV is demonstrated, in which dark matter plays the leading role in creating a CP asymmetry that is the source of the baryon asymmetry. |
0910.3327 | Jacques Soffer | Jacques Soffer | Summary on Theoretical Aspects | 7 pages,Invited talk at the "13th Blois Workshop", CERN, Geneva, June
29 - July 3, 2009 To be published in the DESY Proceedings | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | During the five days of this conference a very dense scientific program has
enlighted our research fields, with the presentation of large number of
interesting lectures. I will try to summarize the theoretical aspects of some
of these new results.
| [
{
"created": "Sat, 17 Oct 2009 19:41:40 GMT",
"version": "v1"
}
] | 2009-10-20 | [
[
"Soffer",
"Jacques",
""
]
] | During the five days of this conference a very dense scientific program has enlighted our research fields, with the presentation of large number of interesting lectures. I will try to summarize the theoretical aspects of some of these new results. |
hep-ph/9708292 | Kataev | A.L.Kataev (INR, Moscow) | The order $O(\bar{\alpha}~\bar{\alpha}_s)$ and $O(\bar{\alpha}^2)$
corrections to the decay width of the neutral Higgs boson to the $\bar{b}b$
pair | LaTeX 5 pages, accepted for publication in Pisma Zh. Eksp. Teor. Fiz.
v 66, N5 (1997) | JETP Lett. 66 (1997) 327-330 | 10.1134/1.567516 | null | hep-ph | null | We present the analytical expressions for the contributions of the order
$O(\bar{\alpha}~\bar{\alpha}_s)$ and $O(\bar{\alpha}^2)$ corrections to the
decay width of the Standard Model Higgs boson into the $\bar{b}b$-pair. The
numerical value of the mixed QED and QCD correction of order
$O(\bar{\alpha}~\bar{\alpha}_s)$ is comparable with the previously calculated
terms in the perturbative series for $\Gamma(H^0\to\bar{b}b)$.
| [
{
"created": "Fri, 8 Aug 1997 15:31:17 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Kataev",
"A. L.",
"",
"INR, Moscow"
]
] | We present the analytical expressions for the contributions of the order $O(\bar{\alpha}~\bar{\alpha}_s)$ and $O(\bar{\alpha}^2)$ corrections to the decay width of the Standard Model Higgs boson into the $\bar{b}b$-pair. The numerical value of the mixed QED and QCD correction of order $O(\bar{\alpha}~\bar{\alpha}_s)$ is comparable with the previously calculated terms in the perturbative series for $\Gamma(H^0\to\bar{b}b)$. |
1609.01085 | Hideko Nagahiro | Hideko Nagahiro, Shigehiro Yasui, Atsushi Hosaka, Makoto Oka, Hiroyuki
Noumi | Structure of charmed baryons studied by pionic decays | 20 pages, 5 figures, 11 tables | Phys. Rev. D 95, 014023 (2017) | 10.1103/PhysRevD.95.014023 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the decays of the charmed baryons aiming at the systematic
understanding of hadron internal structures based on the quark model by paying
attention to heavy quark symmetry. We evaluate the decay widths from the one
pion emission for the known excited states, \Lambda_c^*(2595),
\Lambda_c^*(2625), \Lambda_c^*(2765), \Lambda_c^*(2880) and \Lambda_c^*(2940),
as well as for the ground states \Sigma_c(2455) and \Sigma_c^*(2520). The decay
properties of the lower excited charmed baryons are well explained, and several
important predictions for higher excited baryons are given. We find that the
axial-vector type coupling of the pion to the light quarks is essential, which
is expected from chiral symmetry, to reproduce the decay widths especially of
the low lying \Lambda_c^* baryons. We emphasize the importance of the branching
ratios of \Gamma(\Sigma_c^*\pi)/\Gamma(\Sigma_c\pi) for the study of the nature
of higher excited \Lambda_c^* baryons.
| [
{
"created": "Mon, 5 Sep 2016 10:31:04 GMT",
"version": "v1"
}
] | 2017-02-01 | [
[
"Nagahiro",
"Hideko",
""
],
[
"Yasui",
"Shigehiro",
""
],
[
"Hosaka",
"Atsushi",
""
],
[
"Oka",
"Makoto",
""
],
[
"Noumi",
"Hiroyuki",
""
]
] | We investigate the decays of the charmed baryons aiming at the systematic understanding of hadron internal structures based on the quark model by paying attention to heavy quark symmetry. We evaluate the decay widths from the one pion emission for the known excited states, \Lambda_c^*(2595), \Lambda_c^*(2625), \Lambda_c^*(2765), \Lambda_c^*(2880) and \Lambda_c^*(2940), as well as for the ground states \Sigma_c(2455) and \Sigma_c^*(2520). The decay properties of the lower excited charmed baryons are well explained, and several important predictions for higher excited baryons are given. We find that the axial-vector type coupling of the pion to the light quarks is essential, which is expected from chiral symmetry, to reproduce the decay widths especially of the low lying \Lambda_c^* baryons. We emphasize the importance of the branching ratios of \Gamma(\Sigma_c^*\pi)/\Gamma(\Sigma_c\pi) for the study of the nature of higher excited \Lambda_c^* baryons. |
1904.05520 | Mikl\'os Horv\'ath | Miklos Horvath, Defu Hou, Hai-cang Ren | Non-static Analysis of the Anomalous Chiral Conductivities | 5 pages, 2 figures; contribution to the proceedings of the 8th
International Conference on Quarks and Nuclear Physics (QNP2018), Tsukuba,
November 13-17, 2018 | null | 10.7566/JPSCP.26.024026 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Given the intrinsic nonequilibrium nature of high-energy collisions the
investigation of the dynamical properties of transport phenomena is important.
The study of the real-time behavior of various conductivities and
susceptibilities help refine the simulation tools we use to compare the
theories and the experimental findings. In this contribution we take steps to
give the chiral magnetic conductivity in case of magnetic field and chiral
imbalance are both space-time dependent. Using linear response approximation we
present the general 1-loop resummed expression for the electric current. We
also suggest simple limiting cases in hope for possible implementation into a
hydrodynamical framework.
| [
{
"created": "Thu, 11 Apr 2019 03:56:50 GMT",
"version": "v1"
},
{
"created": "Wed, 3 Jul 2019 02:28:50 GMT",
"version": "v2"
}
] | 2020-01-08 | [
[
"Horvath",
"Miklos",
""
],
[
"Hou",
"Defu",
""
],
[
"Ren",
"Hai-cang",
""
]
] | Given the intrinsic nonequilibrium nature of high-energy collisions the investigation of the dynamical properties of transport phenomena is important. The study of the real-time behavior of various conductivities and susceptibilities help refine the simulation tools we use to compare the theories and the experimental findings. In this contribution we take steps to give the chiral magnetic conductivity in case of magnetic field and chiral imbalance are both space-time dependent. Using linear response approximation we present the general 1-loop resummed expression for the electric current. We also suggest simple limiting cases in hope for possible implementation into a hydrodynamical framework. |
hep-ph/9907490 | Chi-Sing Lam | C.S. Lam | Time Ordering, Energy Ordering, and Factorization | 16 pages in revtex | J.Math.Phys. 41 (2000) 4497-4507 | 10.1063/1.533356 | null | hep-ph math-ph math.MP | null | Relations between integrals of time-ordered product of operators, and their
representation in terms of energy-ordered products are studied. Both can be
decomposed into irreducible factors and these relations are discussed as well.
The energy-ordered representation was invented to separate various infrared
contributions in gauge theories. It is shown that the irreducible time-ordered
expressions can be used to accomplish the same purpose. Besides, it has the
added advantage of being factorizable.
| [
{
"created": "Mon, 26 Jul 1999 14:15:48 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Lam",
"C. S.",
""
]
] | Relations between integrals of time-ordered product of operators, and their representation in terms of energy-ordered products are studied. Both can be decomposed into irreducible factors and these relations are discussed as well. The energy-ordered representation was invented to separate various infrared contributions in gauge theories. It is shown that the irreducible time-ordered expressions can be used to accomplish the same purpose. Besides, it has the added advantage of being factorizable. |
2308.08275 | Bolang Lin | Bolang Lin, Sreeraj Nair, Siqi Xu, Zhi Hu, Chandan Mondal, Xingbo
Zhao, James P.Vary | Generalized parton distributions of gluon in proton: a light-front
quantization approach | 10 pages, 4 figures | null | null | null | hep-ph nucl-th | http://creativecommons.org/licenses/by/4.0/ | We solve for the gluon generalized parton distributions (GPDs) inside the
proton, focusing specifically on leading twist chiral-even GPDs. We obtain and
employ the light-front wavefunctions (LFWFs) of the proton from a light-front
quantized Hamiltonian with Quantum Chromodynamics input using basis light-front
quantization (BLFQ). Our investigation incorporates the valence Fock sector
with three constituent quarks and an additional Fock sector, encompassing three
quarks and a dynamical gluon. We examine the GPDs within impact parameter space
and evaluate the $x$-dependence of the transverse square radius. We find that
the transverse size of the gluon at lower-$x$ is larger than that of the quark,
while it exhibits opposite behavior at large-$x$. Using the proton spin sum
rule, we also determine the relative contributions of quarks and the gluon to
the total angular momentum of the proton.
| [
{
"created": "Wed, 16 Aug 2023 10:31:11 GMT",
"version": "v1"
}
] | 2023-08-17 | [
[
"Lin",
"Bolang",
""
],
[
"Nair",
"Sreeraj",
""
],
[
"Xu",
"Siqi",
""
],
[
"Hu",
"Zhi",
""
],
[
"Mondal",
"Chandan",
""
],
[
"Zhao",
"Xingbo",
""
],
[
"Vary",
"James P.",
""
]
] | We solve for the gluon generalized parton distributions (GPDs) inside the proton, focusing specifically on leading twist chiral-even GPDs. We obtain and employ the light-front wavefunctions (LFWFs) of the proton from a light-front quantized Hamiltonian with Quantum Chromodynamics input using basis light-front quantization (BLFQ). Our investigation incorporates the valence Fock sector with three constituent quarks and an additional Fock sector, encompassing three quarks and a dynamical gluon. We examine the GPDs within impact parameter space and evaluate the $x$-dependence of the transverse square radius. We find that the transverse size of the gluon at lower-$x$ is larger than that of the quark, while it exhibits opposite behavior at large-$x$. Using the proton spin sum rule, we also determine the relative contributions of quarks and the gluon to the total angular momentum of the proton. |
1707.07206 | Gilberto Ramalho | G. Ramalho | Holographic estimate of the meson cloud contribution to nucleon axial
form factor | 14 pages, 5 figures. Published version. Extension of the first
version | Phys. Rev. D 97, 073002 (2018) | 10.1103/PhysRevD.97.073002 | LFTC-18-7/28 | hep-ph hep-ex hep-lat nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use light-front Holography to estimate the valence quark and the meson
cloud contributions to the nucleon axial form factor. The free couplings of the
holographic model are determined by the empirical data and by the information
extracted from lattice QCD. The holographic model provides a good description
of the empirical data when we consider a meson cloud mixture of about 30\% in
the physical nucleon state. The estimate of the valence quark contribution to
the nucleon axial form factor compares well with the lattice QCD data for small
pion masses. Our estimate of the meson cloud contribution to the nucleon axial
form factor has a slower falloff with the square momentum transfer compared to
typical estimates from quark models with meson cloud dressing.
| [
{
"created": "Sat, 22 Jul 2017 19:46:30 GMT",
"version": "v1"
},
{
"created": "Thu, 12 Apr 2018 18:41:06 GMT",
"version": "v2"
}
] | 2018-04-16 | [
[
"Ramalho",
"G.",
""
]
] | We use light-front Holography to estimate the valence quark and the meson cloud contributions to the nucleon axial form factor. The free couplings of the holographic model are determined by the empirical data and by the information extracted from lattice QCD. The holographic model provides a good description of the empirical data when we consider a meson cloud mixture of about 30\% in the physical nucleon state. The estimate of the valence quark contribution to the nucleon axial form factor compares well with the lattice QCD data for small pion masses. Our estimate of the meson cloud contribution to the nucleon axial form factor has a slower falloff with the square momentum transfer compared to typical estimates from quark models with meson cloud dressing. |
1803.10940 | Arindam Das | Arindam Das | Searching for the minimal Seesaw models at the LHC and beyond | Accepted article for the special issue "Search for New Physics beyond
the Standard Model at the Hadron Colliders" in Adv. High Energy Physics | Adv. High Energy Phys. 2018, 9785318 (2018) | 10.1155/2018/9785318 | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | The existence of the tiny neutrino mass and the flavor mixing can be
naturally explained by type-I Seesaw model which is probably the simplest
extension of the Standard Model (SM) using Majorana type SM gauge singlet heavy
Right Handed Neutrinos (RHNs). If the RHNs are around the Electroweak(EW)-scale
having sizable mixings with the SM light neutrinos, they can be produced at the
high energy colliders such as Large Hadron Collider (LHC) and future $100$ TeV
proton-proton (pp) collider through the characteristic signatures with same
sign di-lepton introducing lepton number violations(LNV). On the other hand
Seesaw models, namely inverse Seesaw, with small LNV parameter can accommodate
EW-scale pseudo-Dirac neutrinos with sizable mixings with SM light neutrinos
while satisfying the neutrino oscillation data. Due to the smallness of the LNV
parameter of such models, the `smoking-gun' signature of same-sign di-lepton is
suppressed where as the RHNs in the model will manifest at the LHC and future
$100$ TeV pp collider dominantly through the Lepton number conserving (LNC)
trilepton final state with Missing Transverse Energy (MET). Studying various
production channels of such RHNs we give an updated upper bound on the mixing
parameters of the light-heavy neutrinos at the 13 TeV LHC and future 100 TeV pp
collider.
| [
{
"created": "Thu, 29 Mar 2018 07:13:51 GMT",
"version": "v1"
}
] | 2018-04-25 | [
[
"Das",
"Arindam",
""
]
] | The existence of the tiny neutrino mass and the flavor mixing can be naturally explained by type-I Seesaw model which is probably the simplest extension of the Standard Model (SM) using Majorana type SM gauge singlet heavy Right Handed Neutrinos (RHNs). If the RHNs are around the Electroweak(EW)-scale having sizable mixings with the SM light neutrinos, they can be produced at the high energy colliders such as Large Hadron Collider (LHC) and future $100$ TeV proton-proton (pp) collider through the characteristic signatures with same sign di-lepton introducing lepton number violations(LNV). On the other hand Seesaw models, namely inverse Seesaw, with small LNV parameter can accommodate EW-scale pseudo-Dirac neutrinos with sizable mixings with SM light neutrinos while satisfying the neutrino oscillation data. Due to the smallness of the LNV parameter of such models, the `smoking-gun' signature of same-sign di-lepton is suppressed where as the RHNs in the model will manifest at the LHC and future $100$ TeV pp collider dominantly through the Lepton number conserving (LNC) trilepton final state with Missing Transverse Energy (MET). Studying various production channels of such RHNs we give an updated upper bound on the mixing parameters of the light-heavy neutrinos at the 13 TeV LHC and future 100 TeV pp collider. |
2204.08390 | Anil Thapa | Talal Ahmed Chowdhury, Julian Heeck, Shaikh Saad, Anil Thapa | $W$ boson mass shift and muon magnetic moment in the Zee model | 5 pages + references, expanded LFV, added references, matches
published version | null | 10.1103/PhysRevD.106.035004 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | The CDF collaboration at Fermilab has recently reported a new precision
measurement of the $W$~boson mass showing a substantial $7\sigma$ deviation
from the Standard Model prediction. Moreover, Fermilab has recently confirmed
the longstanding tension in the $(g-2)_\mu$ measurement. We propose a unified
solution to these deviations within the simplest radiative neutrino mass model:
the Zee model. Our analysis establishes non-trivial links between the origin of
neutrino mass, the $(g-2)_\mu$ anomaly, and the $W$~boson mass shift while
being consistent with lepton flavor violation and all other experimental
constraints. We find that the mass spectrum of the physical scalars must be
hierarchical to be consistent with the $W$~boson mass shift; remarkably, this
is also the key to resolving the $(g-2)_\mu$ tension. Furthermore, this mass
splitting offers a unique same-sign dimuon signal through which our model can
be tested at the LHC.
| [
{
"created": "Mon, 18 Apr 2022 16:34:26 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Aug 2022 17:25:35 GMT",
"version": "v2"
}
] | 2022-08-17 | [
[
"Chowdhury",
"Talal Ahmed",
""
],
[
"Heeck",
"Julian",
""
],
[
"Saad",
"Shaikh",
""
],
[
"Thapa",
"Anil",
""
]
] | The CDF collaboration at Fermilab has recently reported a new precision measurement of the $W$~boson mass showing a substantial $7\sigma$ deviation from the Standard Model prediction. Moreover, Fermilab has recently confirmed the longstanding tension in the $(g-2)_\mu$ measurement. We propose a unified solution to these deviations within the simplest radiative neutrino mass model: the Zee model. Our analysis establishes non-trivial links between the origin of neutrino mass, the $(g-2)_\mu$ anomaly, and the $W$~boson mass shift while being consistent with lepton flavor violation and all other experimental constraints. We find that the mass spectrum of the physical scalars must be hierarchical to be consistent with the $W$~boson mass shift; remarkably, this is also the key to resolving the $(g-2)_\mu$ tension. Furthermore, this mass splitting offers a unique same-sign dimuon signal through which our model can be tested at the LHC. |
hep-ph/0312390 | Alexandre Gavrilik | L.V. Adamska, A.M. Gavrilik (BITP, Kiev) | Multi-particle correlations in qp-Bose gas model | 10 pages, latex; v2: minor corrections; v3: minor improvement mainly
to match referee's remark | J.Phys.A37:4787-4796,2004 | 10.1088/0305-4470/37/17/009 | null | hep-ph cond-mat.stat-mech hep-th nucl-th quant-ph | null | The approach based on multimode system of q-deformed oscillators and the
related picture of ideal gas of q-bosons enables to effectively describe the
observed non-Bose type behaviour, in experiments on heavy-ion collisions, of
the intercept (or the "strength") $\lambda$ of the two-particle correlation
function of identical pions or kaons. In this paper we extend main results of
that approach in the two aspects: first, we derive in explicit form the
intercepts of n-particle correlation functions in the case of q-Bose gas model
and, second, provide their explicit two-parameter (or qp-) generalization.
| [
{
"created": "Wed, 31 Dec 2003 19:19:29 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Jan 2004 19:53:40 GMT",
"version": "v2"
},
{
"created": "Thu, 4 Mar 2004 20:35:06 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Adamska",
"L. V.",
"",
"BITP, Kiev"
],
[
"Gavrilik",
"A. M.",
"",
"BITP, Kiev"
]
] | The approach based on multimode system of q-deformed oscillators and the related picture of ideal gas of q-bosons enables to effectively describe the observed non-Bose type behaviour, in experiments on heavy-ion collisions, of the intercept (or the "strength") $\lambda$ of the two-particle correlation function of identical pions or kaons. In this paper we extend main results of that approach in the two aspects: first, we derive in explicit form the intercepts of n-particle correlation functions in the case of q-Bose gas model and, second, provide their explicit two-parameter (or qp-) generalization. |
hep-ph/0109158 | George Rupp | Frieder Kleefeld (CFIF, IST, Lisbon, Portugal), Eef van Beveren
(University of Coimbra, Portugal), George Rupp (CFIF, IST, Lisbon, Portugal),
Michael D. Scadron (Physics Department, University of Arizona, Tucson, USA) | Identifying the quark content of the isoscalar scalar mesons f_0(980),
f_0(1370), and f_0(1500) from weak and electromagnetic processes | v1, 15 pages, plain LaTeX, 1 eps figure. v2, 18 pages, plain LaTeX
(figure included). More discussion, especially on the f0(1370) and its
empirical two-photon width | Phys.Rev.D66:034007,2002 | 10.1103/PhysRevD.66.034007 | null | hep-ph | null | The assignments of the isoscalar scalar mesons f0(980), f0(1370), and
f0(1500) in terms of their qqbar substructure is still a matter of heated
dispute. Here we employ the weak and electromagnetic decays D(s)(+) to f0+pi(+)
and f0 two-photon decays, respectively, to identify the f0(980) and f0(1500) as
mostly ssbar, and the f0(1370) as dominantly nonstrange, in agreement with
previous work. The two-photon decays can be satisfactorily described with quark
as well as with meson loops, though the latter ones provide a less
model-dependent and more quantitative description.
| [
{
"created": "Tue, 18 Sep 2001 22:49:16 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Nov 2001 09:41:54 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Kleefeld",
"Frieder",
"",
"CFIF, IST, Lisbon, Portugal"
],
[
"van Beveren",
"Eef",
"",
"University of Coimbra, Portugal"
],
[
"Rupp",
"George",
"",
"CFIF, IST, Lisbon, Portugal"
],
[
"Scadron",
"Michael D.",
"",
"Physics Department, Univ... | The assignments of the isoscalar scalar mesons f0(980), f0(1370), and f0(1500) in terms of their qqbar substructure is still a matter of heated dispute. Here we employ the weak and electromagnetic decays D(s)(+) to f0+pi(+) and f0 two-photon decays, respectively, to identify the f0(980) and f0(1500) as mostly ssbar, and the f0(1370) as dominantly nonstrange, in agreement with previous work. The two-photon decays can be satisfactorily described with quark as well as with meson loops, though the latter ones provide a less model-dependent and more quantitative description. |
1311.0877 | Martin Spinrath | Stefan Antusch, Stephen F. King, Martin Spinrath | GUT predictions for quark-lepton Yukawa coupling ratios with messenger
masses from non-singlets | 18 pages, 4 figures; missing numbers in table 3 added | Phys. Rev. D 89, 055027 (2014) | 10.1103/PhysRevD.89.055027 | MPP-2013-282, SISSA 49/2013/FISI, TTP13-035 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose new predictions from Grand Unified Theories (GUTs) (applicable to
both supersymmetric (SUSY) and non-SUSY models) for the ratios of quark and
lepton Yukawa couplings. These new predictions arise from splitting the masses
of the messenger fields for the GUT scale Yukawa operators by Clebsch-Gordan
factors from GUT symmetry breaking. This has the effect that these factors
enter inversely in the predicted quark-lepton Yukawa coupling ratios, leading
to new possible GUT predictions. We systematically construct the new
predictions that can be realised in this way in SU(5) GUTs and Pati-Salam
unified theories and discuss model building applications.
| [
{
"created": "Mon, 4 Nov 2013 21:00:04 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Mar 2014 12:28:36 GMT",
"version": "v2"
},
{
"created": "Tue, 24 Mar 2015 09:36:20 GMT",
"version": "v3"
}
] | 2015-03-25 | [
[
"Antusch",
"Stefan",
""
],
[
"King",
"Stephen F.",
""
],
[
"Spinrath",
"Martin",
""
]
] | We propose new predictions from Grand Unified Theories (GUTs) (applicable to both supersymmetric (SUSY) and non-SUSY models) for the ratios of quark and lepton Yukawa couplings. These new predictions arise from splitting the masses of the messenger fields for the GUT scale Yukawa operators by Clebsch-Gordan factors from GUT symmetry breaking. This has the effect that these factors enter inversely in the predicted quark-lepton Yukawa coupling ratios, leading to new possible GUT predictions. We systematically construct the new predictions that can be realised in this way in SU(5) GUTs and Pati-Salam unified theories and discuss model building applications. |
1310.4097 | Benjamin Callen | Benjamin D. Callen, Raymond R. Volkas | A Clash-of-Symmetries Mechanism from Intersecting Domain-Wall Branes | 36 pages, 2 figures, one reference added. This version has been
accepted for publication in Physical Review D | Phys. Rev. D 89, 056004 (2014) | 10.1103/PhysRevD.89.056004 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a new Clash-of-Symmetries mechanism in the context of an
intersecting domain-wall brane model in 5+1-dimensional Minkowskian spacetime
recently proposed by the authors. This new application of the Dvali-Shifman
idea is designed for localizing gauge fields on a domain-wall intersection and
we employ it by adding a gauge group $G$ and giving the scalar fields which
form lump-like profiles gauge charges. These fields in turn break $G$ to two
different subgroups $H_{1}$ and $H_{2}$ on each domain wall, and the gauge
fields of these subgroups are taken to be localized to the respective walls by
the confinement dynamics of $G$. There is then a further breaking on the
domain-wall intersection to $H_{1}\cap{}H_{2}$ and gauge fields of this overlap
group can then be localized to the intersection if they belong inside
non-Abelian subgroups of both $H_{1}$ and $H_{2}$ which are spontaneously
broken on the intersection and confining in the 4+1D bulks of the respective
domain-wall branes. This mechanism has some similarities to the
Clash-of-Symmetries mechanism on a single domain wall except that in this case
$H_{1}$ and $H_{2}$ need not be isomorphic. We then give some interesting
examples of the mechanism in an SU(7) gauge theory, several of which result in
the localization of the Standard Model gauge group.
| [
{
"created": "Tue, 15 Oct 2013 16:06:20 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Dec 2013 18:16:16 GMT",
"version": "v2"
}
] | 2014-03-26 | [
[
"Callen",
"Benjamin D.",
""
],
[
"Volkas",
"Raymond R.",
""
]
] | We present a new Clash-of-Symmetries mechanism in the context of an intersecting domain-wall brane model in 5+1-dimensional Minkowskian spacetime recently proposed by the authors. This new application of the Dvali-Shifman idea is designed for localizing gauge fields on a domain-wall intersection and we employ it by adding a gauge group $G$ and giving the scalar fields which form lump-like profiles gauge charges. These fields in turn break $G$ to two different subgroups $H_{1}$ and $H_{2}$ on each domain wall, and the gauge fields of these subgroups are taken to be localized to the respective walls by the confinement dynamics of $G$. There is then a further breaking on the domain-wall intersection to $H_{1}\cap{}H_{2}$ and gauge fields of this overlap group can then be localized to the intersection if they belong inside non-Abelian subgroups of both $H_{1}$ and $H_{2}$ which are spontaneously broken on the intersection and confining in the 4+1D bulks of the respective domain-wall branes. This mechanism has some similarities to the Clash-of-Symmetries mechanism on a single domain wall except that in this case $H_{1}$ and $H_{2}$ need not be isomorphic. We then give some interesting examples of the mechanism in an SU(7) gauge theory, several of which result in the localization of the Standard Model gauge group. |
1902.06793 | David Kaplan | Peter W. Graham, David E. Kaplan, Surjeet Rajendran | Relaxation of the Cosmological Constant | 13 pages, 3 figures | Phys. Rev. D 100, 015048 (2019) | 10.1103/PhysRevD.100.015048 | null | hep-ph gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a model that naturally tunes a large positive cosmological
constant to a small cosmological constant. A slowly rolling scalar field
decreases the cosmological constant to a small negative value, causing the
universe to contract, thus reheating it. An expanding universe with a small
positive cosmological constant can be obtained, respectively, by coupling this
solution to any model of a cosmological bounce and coupling the scalar field to
a sector that undergoes a technically natural phase transition at the meV
scale. A robust prediction of this model is a rolling scalar field today with
some coupling to the standard model. This can potentially be experimentally
probed in a variety of cosmological and terrestrial experiments, such as probes
of the equation of state of dark energy, birefringence in the cosmic microwave
background and terrestrial tests of Lorentz violation.
| [
{
"created": "Mon, 18 Feb 2019 20:50:32 GMT",
"version": "v1"
}
] | 2019-08-07 | [
[
"Graham",
"Peter W.",
""
],
[
"Kaplan",
"David E.",
""
],
[
"Rajendran",
"Surjeet",
""
]
] | We present a model that naturally tunes a large positive cosmological constant to a small cosmological constant. A slowly rolling scalar field decreases the cosmological constant to a small negative value, causing the universe to contract, thus reheating it. An expanding universe with a small positive cosmological constant can be obtained, respectively, by coupling this solution to any model of a cosmological bounce and coupling the scalar field to a sector that undergoes a technically natural phase transition at the meV scale. A robust prediction of this model is a rolling scalar field today with some coupling to the standard model. This can potentially be experimentally probed in a variety of cosmological and terrestrial experiments, such as probes of the equation of state of dark energy, birefringence in the cosmic microwave background and terrestrial tests of Lorentz violation. |
2004.04789 | Jihn E. Kim | Jihn E. Kim, Se-Jin Kim | On the progenitor quark mass matrix | 7 pages, 1 figure | J. Korean Phys. Soc. 77, 10-16 (2020) | 10.3938/jkps.77.10 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We determined the quark mass matrix in terms of a small expansion parameter
$\sqrt{\varepsilon}$, which gives correctly all the quark masses and the CKM
matrix elements at the electroweak (EW) scale, and obtain a progenitor form at
the GUT scale by running the EW scale mass matrix. Finally, a possible texture
form for the progenitor quark mass matrix is suggested.
| [
{
"created": "Thu, 9 Apr 2020 20:07:08 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Apr 2020 01:08:34 GMT",
"version": "v2"
}
] | 2020-07-16 | [
[
"Kim",
"Jihn E.",
""
],
[
"Kim",
"Se-Jin",
""
]
] | We determined the quark mass matrix in terms of a small expansion parameter $\sqrt{\varepsilon}$, which gives correctly all the quark masses and the CKM matrix elements at the electroweak (EW) scale, and obtain a progenitor form at the GUT scale by running the EW scale mass matrix. Finally, a possible texture form for the progenitor quark mass matrix is suggested. |
1609.00899 | Nobuo Sato | N. Sato, J.J. Ethier, W. Melnitchouk, M. Hirai, S. Kumano, A. Accardi | First Monte Carlo analysis of fragmentation functions from
single-inclusive $e^+ e^-$ annihilation | 44 pages, 11 figures | Phys. Rev. D 94, 114004 (2016) | 10.1103/PhysRevD.94.114004 | JLAB-THY-16-2327, KEK-TH-1920, J-PARC-TH-0060 | hep-ph hep-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We perform the first iterative Monte Carlo (IMC) analysis of fragmentation
functions constrained by all available data from single-inclusive $e^+ e^-$
annihilation into pions and kaons. The IMC method eliminates potential bias in
traditional analyses based on single fits introduced by fixing parameters not
well contrained by the data and provides a statistically rigorous determination
of uncertainties. Our analysis reveals specific features of fragmentation
functions using the new IMC methodology and those obtained from previous
analyses, especially for light quarks and for strange quark fragmentation to
kaons.
| [
{
"created": "Sun, 4 Sep 2016 07:01:47 GMT",
"version": "v1"
}
] | 2016-12-07 | [
[
"Sato",
"N.",
""
],
[
"Ethier",
"J. J.",
""
],
[
"Melnitchouk",
"W.",
""
],
[
"Hirai",
"M.",
""
],
[
"Kumano",
"S.",
""
],
[
"Accardi",
"A.",
""
]
] | We perform the first iterative Monte Carlo (IMC) analysis of fragmentation functions constrained by all available data from single-inclusive $e^+ e^-$ annihilation into pions and kaons. The IMC method eliminates potential bias in traditional analyses based on single fits introduced by fixing parameters not well contrained by the data and provides a statistically rigorous determination of uncertainties. Our analysis reveals specific features of fragmentation functions using the new IMC methodology and those obtained from previous analyses, especially for light quarks and for strange quark fragmentation to kaons. |
0808.1221 | Shri Singh krishna | M. Sajjad Athar, S. Chauhan and S. K. Singh | Neutral Current induced $\pi^0$ production and neutrino magnetic moment | 6 pages, 5 figures | Phys.Rev.D78:037301,2008 | 10.1103/PhysRevD.78.037301 | null | hep-ph | http://creativecommons.org/licenses/by/3.0/ | We have studied the total cross section, $Q^2$, momentum and angular
distributions for pions in the $\nu$($\bar \nu$) induced $\pi^0$ production
from nucleons. The calculations have been done for the weak production induced
by the neutral current in the standard model and the electromagnetic production
induced by neutrino magnetic moment. It has been found that with the present
experimental limits on the muon neutrino magnetic moment $\mu_{\nu_\mu}$, the
electromagnetic contribution to the cross section for the $\pi^0$ production is
small. The neutrino induced neutral current production of $\pi^{0}$, while
giving an alternative method to study the magnetic moment of neutrino
$\mu_{\nu_\mu}$, does not provide any improvement over the present experimental
limit on $\mu_{\nu_\mu}$ from the observation of this process in future
experiments at T2K and NO$\nu$A.
| [
{
"created": "Fri, 8 Aug 2008 14:31:34 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Athar",
"M. Sajjad",
""
],
[
"Chauhan",
"S.",
""
],
[
"Singh",
"S. K.",
""
]
] | We have studied the total cross section, $Q^2$, momentum and angular distributions for pions in the $\nu$($\bar \nu$) induced $\pi^0$ production from nucleons. The calculations have been done for the weak production induced by the neutral current in the standard model and the electromagnetic production induced by neutrino magnetic moment. It has been found that with the present experimental limits on the muon neutrino magnetic moment $\mu_{\nu_\mu}$, the electromagnetic contribution to the cross section for the $\pi^0$ production is small. The neutrino induced neutral current production of $\pi^{0}$, while giving an alternative method to study the magnetic moment of neutrino $\mu_{\nu_\mu}$, does not provide any improvement over the present experimental limit on $\mu_{\nu_\mu}$ from the observation of this process in future experiments at T2K and NO$\nu$A. |
1111.7279 | Peter Watson | Peter Watson, Hugo Reinhardt | Leading order QCD in Coulomb gauge | 12 pages, 2 figures, talk given at the "II International Workshop on
QCD Green's Functions, Confinement and Phenomenology", Trento, Italy,
September 2011 | null | null | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Coulomb gauge QCD in the first order formalism can be written in terms of a
ghost-free, nonlocal action that ensures total color charge conservation via
Gauss' law. Making an Ansatz whereby the nonlocal term (the Coulomb kernel) is
replaced by its expectation value, the resulting Dyson-Schwinger equations can
be derived. With a leading order truncation, these equations reduce to the gap
equations for the static gluon and quark propagators obtained from a
quasi-particle approximation to the canonical Hamiltonian approach. Moreover a
connection to the heavy quark limit can be established, allowing an intuitive
explanation for the charge constraint and infrared divergences.
| [
{
"created": "Wed, 30 Nov 2011 19:26:49 GMT",
"version": "v1"
}
] | 2011-12-01 | [
[
"Watson",
"Peter",
""
],
[
"Reinhardt",
"Hugo",
""
]
] | Coulomb gauge QCD in the first order formalism can be written in terms of a ghost-free, nonlocal action that ensures total color charge conservation via Gauss' law. Making an Ansatz whereby the nonlocal term (the Coulomb kernel) is replaced by its expectation value, the resulting Dyson-Schwinger equations can be derived. With a leading order truncation, these equations reduce to the gap equations for the static gluon and quark propagators obtained from a quasi-particle approximation to the canonical Hamiltonian approach. Moreover a connection to the heavy quark limit can be established, allowing an intuitive explanation for the charge constraint and infrared divergences. |
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