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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
hep-ph/9507242
|
Andre Likhoded
|
A.V.Berezhnoy, V.V.Kiselev, A.K.Likhoded
|
Hadronic production of baryons, containing two heavy quarks
|
7 pages, LATEX file and tar-compressed uuencoded figures
|
Phys.Atom.Nucl. 59 (1996) 870-874; Yad.Fiz. 59 (1996) 909-913
| null |
IHEP 95-87, Protvino, Russia
|
hep-ph
| null |
In the framework of QCD perturbation theory, total and differential cross
sections of the $\Xi_{bc}'$, $\Xi_{bc}^{(*)}$ and $\Xi_{cc}^{(*)}$ baryons
production in gluon collisions are calculated in the leading order over
$\alpha_s$ for the doubly heavy ($b c$) and ($ c c$) diquarks. At both small
and large transverse momenta of the baryons, a use of the mechanism of the
heavy quark fragmentation into the heavy diquark is shown to underestimate the
cross section values in comparison with the exact numerical calculations of
complete set of diagrams. The expected in Tevatron experiments yield of baryons
with two heavy quarks is evaluated as $(1.3\pm 0.3) \cdot 10^5 \,\,
bcq$-baryons and $(1.6\pm 0.3) \cdot 10^4 \,\, ccq$-baryons at $p_T>5$ GeV and
$|y|<1$ of the baryon momentum and rapidity cuts, with account for the
antiparticle yields.
|
[
{
"created": "Thu, 6 Jul 1995 12:12:27 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Berezhnoy",
"A. V.",
""
],
[
"Kiselev",
"V. V.",
""
],
[
"Likhoded",
"A. K.",
""
]
] |
In the framework of QCD perturbation theory, total and differential cross sections of the $\Xi_{bc}'$, $\Xi_{bc}^{(*)}$ and $\Xi_{cc}^{(*)}$ baryons production in gluon collisions are calculated in the leading order over $\alpha_s$ for the doubly heavy ($b c$) and ($ c c$) diquarks. At both small and large transverse momenta of the baryons, a use of the mechanism of the heavy quark fragmentation into the heavy diquark is shown to underestimate the cross section values in comparison with the exact numerical calculations of complete set of diagrams. The expected in Tevatron experiments yield of baryons with two heavy quarks is evaluated as $(1.3\pm 0.3) \cdot 10^5 \,\, bcq$-baryons and $(1.6\pm 0.3) \cdot 10^4 \,\, ccq$-baryons at $p_T>5$ GeV and $|y|<1$ of the baryon momentum and rapidity cuts, with account for the antiparticle yields.
|
0911.4634
|
B. L. G. Bakker
|
A.M. Badalian, B.L.G. Bakker, I.V. Danilkin
|
The Hyperfine Splittings in Bottomonium and the $B_q (q=n,s,c)$ Mesons
|
5 pages revtex4
|
Phys.Rev.D81:071502,2010; Erratum-ibid.D81:099902,2010
|
10.1103/PhysRevD.81.071502 10.1103/PhysRevD.81.099902
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A universal description of the hyperfine splittings (HFS) in bottomonium and
the $B_q (q=n,s,c)$ mesons is obtained with a universal strong coupling
constant $\alpha_s(\mu)=0.305(2)$ in a spin-spin potential. Other
characteristics are calculated within the Field Correlator Method, taking the
freezing value of the strong coupling independent of $n_f$. The HFS $M(B^*)-
M(B)=45.3(3)$ MeV, $M(B_s^*) - M(B_s)=46.5(3)$ MeV are obtained in full
agreement with experiment both for $n_f=3$ and $n_f=4$. In bottomonium,
$M(\Upsilon(9460))- M(\eta_b)=70.0(4)$ MeV for $n_f=5$ agrees with the BaBar
data, while a smaller HFS, equal to 64(1) MeV, is obtained for $n_f=4$. We
predict HFS $M(\Upsilon(2S))-M(\eta_b(2S))=36(1)$ MeV, $M(\Upsilon(3S))-
M(\eta(3S))=27(1)$ MeV, and $M(B_c^*) - M(B_c)= 57.5(10)$ MeV, which gives
$M(B_c^*)=6334(1)$ MeV, $M(B_c(2 {}^1S_0))=6865(5)$ MeV, and $M(B_c^*(2S
{}^3S_1))=6901(5)$ MeV.
|
[
{
"created": "Tue, 24 Nov 2009 14:00:56 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Mar 2010 13:19:39 GMT",
"version": "v2"
}
] |
2014-11-20
|
[
[
"Badalian",
"A. M.",
""
],
[
"Bakker",
"B. L. G.",
""
],
[
"Danilkin",
"I. V.",
""
]
] |
A universal description of the hyperfine splittings (HFS) in bottomonium and the $B_q (q=n,s,c)$ mesons is obtained with a universal strong coupling constant $\alpha_s(\mu)=0.305(2)$ in a spin-spin potential. Other characteristics are calculated within the Field Correlator Method, taking the freezing value of the strong coupling independent of $n_f$. The HFS $M(B^*)- M(B)=45.3(3)$ MeV, $M(B_s^*) - M(B_s)=46.5(3)$ MeV are obtained in full agreement with experiment both for $n_f=3$ and $n_f=4$. In bottomonium, $M(\Upsilon(9460))- M(\eta_b)=70.0(4)$ MeV for $n_f=5$ agrees with the BaBar data, while a smaller HFS, equal to 64(1) MeV, is obtained for $n_f=4$. We predict HFS $M(\Upsilon(2S))-M(\eta_b(2S))=36(1)$ MeV, $M(\Upsilon(3S))- M(\eta(3S))=27(1)$ MeV, and $M(B_c^*) - M(B_c)= 57.5(10)$ MeV, which gives $M(B_c^*)=6334(1)$ MeV, $M(B_c(2 {}^1S_0))=6865(5)$ MeV, and $M(B_c^*(2S {}^3S_1))=6901(5)$ MeV.
|
hep-ph/9509412
|
Yuping Kuang
|
Chong-Xing Yue, Yu-Ping Kuang, Gong-Ru Lu
|
Multiscale Technicolor and the Zbb-bar Vertex
|
9-page LaTex file
|
J.Phys.G23:163-168,1997
|
10.1088/0954-3899/23/2/004
|
TUIMP-TH-95/72
|
hep-ph
| null |
We estimate the correction to the Zbb-bar vertex arising from the exchanges
of the sideways extended technicolor (ETC) boson and the flavor-diagonal ETC
boson in the multiscale walking technicolor model. The obtained result is too
large to explain the present data. However, if we introduce a new self-
interaction for the top quark to induce the top quark condensate serving as the
origin of the large top quark mass, the corrected R_b=Gamma_b/Gamma_h can be
consistent with the recent LEP data. The corresponding correction to
R_c=Gamma_c/Gamma_h is shown to be negligibly small.
|
[
{
"created": "Thu, 28 Sep 1995 09:03:00 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Yue",
"Chong-Xing",
""
],
[
"Kuang",
"Yu-Ping",
""
],
[
"Lu",
"Gong-Ru",
""
]
] |
We estimate the correction to the Zbb-bar vertex arising from the exchanges of the sideways extended technicolor (ETC) boson and the flavor-diagonal ETC boson in the multiscale walking technicolor model. The obtained result is too large to explain the present data. However, if we introduce a new self- interaction for the top quark to induce the top quark condensate serving as the origin of the large top quark mass, the corrected R_b=Gamma_b/Gamma_h can be consistent with the recent LEP data. The corresponding correction to R_c=Gamma_c/Gamma_h is shown to be negligibly small.
|
hep-ph/0501060
|
Gilberto Tavares-Velasco
|
A. Cordero-Cid, J. L. Garcia-Luna, F. Ramirez-Zavaleta, G.
Tavares-Velasco, J.J. Toscano
|
Rare three-body decay t -> c h gamma in the standard model and the
two-Higgs doublet model
|
Updated to match published version
|
J.Phys. G32 (2006) 529-546
|
10.1088/0954-3899/32/4/010
| null |
hep-ph
| null |
A complete calculation of the rare three-body decay t --> c h gamma is
presented in the framework of the standard model. In the unitary gauge, such a
calculation involves about 20 Feynman diagrams. We also calculate this decay in
the general two-Higgs doublet model (model III), in which it arises at the
tree-level. While in the standard model the decay t --> c h gamma is extremely
suppressed, with a branching fraction of the order of $10^{-15}$ for a Higgs
boson mass of the order of 115 GeV, in the model III it may have a branching
ratio up to $10^{-5}$. We also discuss the crossed decay h --> b \bar{s} gamma.
|
[
{
"created": "Sun, 9 Jan 2005 04:34:36 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Jan 2005 17:24:01 GMT",
"version": "v2"
},
{
"created": "Tue, 28 Feb 2006 06:57:20 GMT",
"version": "v3"
}
] |
2007-05-23
|
[
[
"Cordero-Cid",
"A.",
""
],
[
"Garcia-Luna",
"J. L.",
""
],
[
"Ramirez-Zavaleta",
"F.",
""
],
[
"Tavares-Velasco",
"G.",
""
],
[
"Toscano",
"J. J.",
""
]
] |
A complete calculation of the rare three-body decay t --> c h gamma is presented in the framework of the standard model. In the unitary gauge, such a calculation involves about 20 Feynman diagrams. We also calculate this decay in the general two-Higgs doublet model (model III), in which it arises at the tree-level. While in the standard model the decay t --> c h gamma is extremely suppressed, with a branching fraction of the order of $10^{-15}$ for a Higgs boson mass of the order of 115 GeV, in the model III it may have a branching ratio up to $10^{-5}$. We also discuss the crossed decay h --> b \bar{s} gamma.
|
1302.1060
|
Antonio Delgado
|
Alfredo Aranda, Cesar Bonilla, Francisco de Anda, Antonio Delgado and
Jaime Hern\'andez-S\'anchez
|
Higgs decay into two photons from a 3HDM with flavor symmetry
|
4 pages, 3 figures, version to be published in PLB
|
Phys.Lett.B725:97-100 (2013)
|
10.1016/j.physletb.2013.06.047
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this short letter we show that the excess of events in the decay of Higgs
to two photons reported by ATLAS and CMS can be easily accommodated in a flavor
renormalizable three Higgs doublet model (3HDM). The model is consistent with
all fermion masses, mixing angles, and flavor changing neutral current
constraints.
|
[
{
"created": "Tue, 5 Feb 2013 15:12:10 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Jun 2013 04:44:20 GMT",
"version": "v2"
}
] |
2014-01-24
|
[
[
"Aranda",
"Alfredo",
""
],
[
"Bonilla",
"Cesar",
""
],
[
"de Anda",
"Francisco",
""
],
[
"Delgado",
"Antonio",
""
],
[
"Hernández-Sánchez",
"Jaime",
""
]
] |
In this short letter we show that the excess of events in the decay of Higgs to two photons reported by ATLAS and CMS can be easily accommodated in a flavor renormalizable three Higgs doublet model (3HDM). The model is consistent with all fermion masses, mixing angles, and flavor changing neutral current constraints.
|
hep-ph/9801300
|
Gaby Raedel
|
A. De Roeck (DESY,CERN), A. Deshpande (Yale), V. W. Hughes (Yale), J.
Lichtenstadt (Tel Aviv), G. Radel (CERN)
|
A Study of the Polarized Structure Function g_1^p(x,Q^2) and the
Polarized Gluon Distribution Delta g(x,Q^2) at HERA
|
20 pages including 7 figures, references added, discussion on
systematic errors expanded, version to appear in Eur.Phys.J.C
|
Eur.Phys.J.C6:121-131,1999
|
10.1007/s100520050325
|
DESY 97-249
|
hep-ph
| null |
We present estimates of possible data on spin-dependent asymmetries in
inclusive scattering of high energy polarized electrons by high energy
polarized protons at HERA with their statistical errors and discuss systematic
errors. We show that these data will provide important information on the low-x
behavior of the polarized structure function g_1, and will reduce the
uncertainty in the determination of the first moment of the polarized gluon
distribution Delta g(x,Q^2) obtained from the QCD analysis of g_1 in NLO.
Furthermore, using asymmetries for di-jet events from a polarized HERA would
substantially reduce the uncertainty in the shape of Delta g(x,Q^2). Using the
information on Delta g(x,Q^2) from the di-jet analysis in conjunction with the
NLO QCD analysis of g_1 will provide an accurate determination of Delta
g(x,Q^2) and its first moment.
|
[
{
"created": "Wed, 14 Jan 1998 15:04:02 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Apr 1998 14:08:09 GMT",
"version": "v2"
}
] |
2011-09-13
|
[
[
"De Roeck",
"A.",
"",
"DESY,CERN"
],
[
"Deshpande",
"A.",
"",
"Yale"
],
[
"Hughes",
"V. W.",
"",
"Yale"
],
[
"Lichtenstadt",
"J.",
"",
"Tel Aviv"
],
[
"Radel",
"G.",
"",
"CERN"
]
] |
We present estimates of possible data on spin-dependent asymmetries in inclusive scattering of high energy polarized electrons by high energy polarized protons at HERA with their statistical errors and discuss systematic errors. We show that these data will provide important information on the low-x behavior of the polarized structure function g_1, and will reduce the uncertainty in the determination of the first moment of the polarized gluon distribution Delta g(x,Q^2) obtained from the QCD analysis of g_1 in NLO. Furthermore, using asymmetries for di-jet events from a polarized HERA would substantially reduce the uncertainty in the shape of Delta g(x,Q^2). Using the information on Delta g(x,Q^2) from the di-jet analysis in conjunction with the NLO QCD analysis of g_1 will provide an accurate determination of Delta g(x,Q^2) and its first moment.
|
hep-ph/9606219
| null |
P.Colangelo, F.De Fazio, G.Nardulli
|
On the Decay Mode $B^- \to \mu^- \bar \nu_\mu \gamma$
|
LaTex, 9 pages, 2 uuencoded postscript figures
|
Phys.Lett.B386:328-334,1996
|
10.1016/0370-2693(96)00955-0
|
BARI-TH/96-235
|
hep-ph
| null |
A QCD relativistic potential model is employed to compute the decay rate and
the photon spectrum of the process $B^- \to \mu^- {\bar \nu}_\mu \gamma$. The
result ${\cal B}(B^- \to \mu^- {\bar \nu}_\mu \gamma) \simeq 1 \times 10^{-6}$
confirms the enhancement of this decay channel with respect to the purely
leptonic mode, and supports the proposal of using this process to access
relevant hadronic quantities such as the $B$-meson leptonic decay constant and
the CKM matrix element $V_{ub}$.
|
[
{
"created": "Tue, 4 Jun 1996 11:29:46 GMT",
"version": "v1"
}
] |
2010-11-23
|
[
[
"Colangelo",
"P.",
""
],
[
"De Fazio",
"F.",
""
],
[
"Nardulli",
"G.",
""
]
] |
A QCD relativistic potential model is employed to compute the decay rate and the photon spectrum of the process $B^- \to \mu^- {\bar \nu}_\mu \gamma$. The result ${\cal B}(B^- \to \mu^- {\bar \nu}_\mu \gamma) \simeq 1 \times 10^{-6}$ confirms the enhancement of this decay channel with respect to the purely leptonic mode, and supports the proposal of using this process to access relevant hadronic quantities such as the $B$-meson leptonic decay constant and the CKM matrix element $V_{ub}$.
|
2205.00942
|
Valerie Fiona Domcke
|
Valerie Domcke, Keisuke Harigaya and Kyohei Mukaida
|
Charge transfer between rotating complex scalar fields
|
31 pages, 7 figures
| null |
10.1007/JHEP08(2022)234
|
CERN-TH-2022-075, KEK-TH-2422
|
hep-ph astro-ph.CO
|
http://creativecommons.org/licenses/by/4.0/
|
We consider the transfer of a U(1) charge density between Bose-Einstein
condensates of complex scalar fields coupled to a thermal bath, focusing on the
case of a homogeneous Affleck-Dine field transmitting the charge stored in its
angular motion to an axion field. We demonstrate that in the absence of
additional symmetries this charge transfer, aided by cosmic expansion as well
as the thermal effective potential of the Affleck-Dine field, can be very
efficient. The charge redistribution between the scalar fields becomes possible
if the interactions with the thermal bath break the original U(1) x U(1)
symmetry down to a single U(1) symmetry; the charge distribution between the
two fields is then determined by minimizing the free energy. We discuss
implications for cosmological setups involving complex scalars, with
applications to axion dark matter, baryogenesis, kination domination, and
gravitational wave production.
|
[
{
"created": "Mon, 2 May 2022 14:41:12 GMT",
"version": "v1"
}
] |
2022-09-07
|
[
[
"Domcke",
"Valerie",
""
],
[
"Harigaya",
"Keisuke",
""
],
[
"Mukaida",
"Kyohei",
""
]
] |
We consider the transfer of a U(1) charge density between Bose-Einstein condensates of complex scalar fields coupled to a thermal bath, focusing on the case of a homogeneous Affleck-Dine field transmitting the charge stored in its angular motion to an axion field. We demonstrate that in the absence of additional symmetries this charge transfer, aided by cosmic expansion as well as the thermal effective potential of the Affleck-Dine field, can be very efficient. The charge redistribution between the scalar fields becomes possible if the interactions with the thermal bath break the original U(1) x U(1) symmetry down to a single U(1) symmetry; the charge distribution between the two fields is then determined by minimizing the free energy. We discuss implications for cosmological setups involving complex scalars, with applications to axion dark matter, baryogenesis, kination domination, and gravitational wave production.
|
hep-ph/0106007
|
Fulvia De Fazio
|
Fulvia De Fazio
|
Highlights in the analysis of exclusive B decays
|
LaTex, 5 pages. Invited talk at the XIII Italian meeting on the
Physics at LEP "LEPTRE", Rome April 18-20 2001, to appear in the proceedings.
One reference added
| null | null |
BARI-TH/417-2001
|
hep-ph
| null |
I briefly describe recent developments in the theoretical analysis of non
leptonic and semileptonic B decays. For non leptonic transitions, I focus on
factorization, from the naive formulation to the most recent achievements. As
for semileptonic decays, I mainly consider B transitions to excited charmed
states.
|
[
{
"created": "Fri, 1 Jun 2001 11:03:57 GMT",
"version": "v1"
},
{
"created": "Tue, 31 Jul 2001 13:23:25 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"De Fazio",
"Fulvia",
""
]
] |
I briefly describe recent developments in the theoretical analysis of non leptonic and semileptonic B decays. For non leptonic transitions, I focus on factorization, from the naive formulation to the most recent achievements. As for semileptonic decays, I mainly consider B transitions to excited charmed states.
|
2210.11489
|
Yifeng Huang
|
Jack H. Collins, Yifeng Huang, Simon Knapen, Benjamin Nachman, Daniel
Whiteson
|
Machine-Learning Compression for Particle Physics Discoveries
|
9 pages, 3 figures
| null | null |
SLAC-PUB-17704
|
hep-ph cs.LG hep-ex physics.data-an
|
http://creativecommons.org/licenses/by/4.0/
|
In collider-based particle and nuclear physics experiments, data are produced
at such extreme rates that only a subset can be recorded for later analysis.
Typically, algorithms select individual collision events for preservation and
store the complete experimental response. A relatively new alternative strategy
is to additionally save a partial record for a larger subset of events,
allowing for later specific analysis of a larger fraction of events. We propose
a strategy that bridges these paradigms by compressing entire events for
generic offline analysis but at a lower fidelity. An optimal-transport-based
$\beta$ Variational Autoencoder (VAE) is used to automate the compression and
the hyperparameter $\beta$ controls the compression fidelity. We introduce a
new approach for multi-objective learning functions by simultaneously learning
a VAE appropriate for all values of $\beta$ through parameterization. We
present an example use case, a di-muon resonance search at the Large Hadron
Collider (LHC), where we show that simulated data compressed by our $\beta$-VAE
has enough fidelity to distinguish distinct signal morphologies.
|
[
{
"created": "Thu, 20 Oct 2022 18:00:04 GMT",
"version": "v1"
},
{
"created": "Sun, 18 Dec 2022 22:33:13 GMT",
"version": "v2"
}
] |
2022-12-20
|
[
[
"Collins",
"Jack H.",
""
],
[
"Huang",
"Yifeng",
""
],
[
"Knapen",
"Simon",
""
],
[
"Nachman",
"Benjamin",
""
],
[
"Whiteson",
"Daniel",
""
]
] |
In collider-based particle and nuclear physics experiments, data are produced at such extreme rates that only a subset can be recorded for later analysis. Typically, algorithms select individual collision events for preservation and store the complete experimental response. A relatively new alternative strategy is to additionally save a partial record for a larger subset of events, allowing for later specific analysis of a larger fraction of events. We propose a strategy that bridges these paradigms by compressing entire events for generic offline analysis but at a lower fidelity. An optimal-transport-based $\beta$ Variational Autoencoder (VAE) is used to automate the compression and the hyperparameter $\beta$ controls the compression fidelity. We introduce a new approach for multi-objective learning functions by simultaneously learning a VAE appropriate for all values of $\beta$ through parameterization. We present an example use case, a di-muon resonance search at the Large Hadron Collider (LHC), where we show that simulated data compressed by our $\beta$-VAE has enough fidelity to distinguish distinct signal morphologies.
|
1306.5352
|
Ruben Sandapen
|
Ruben Sandapen and Mohammad Ahmady
|
Predicting radiative B decays to vector mesons in holographic QCD
|
5 pages, 3 figures. Proceedings contribution for the XXI
International Workshop on Deep-Inelastic Scattering and Related Subjects,
22-26 April 2013, Marseilles, France
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We predict observables in radiative B decays to vector mesons using
holographic AdS/QCD Distribution Amplitudes for the vector mesons. We find that
end-point divergences can be avoided when computing power-suppressed
contributions in the heavy quark limit. The results reported here can be found
in references [1] and [2].
|
[
{
"created": "Sat, 22 Jun 2013 19:50:41 GMT",
"version": "v1"
}
] |
2013-06-25
|
[
[
"Sandapen",
"Ruben",
""
],
[
"Ahmady",
"Mohammad",
""
]
] |
We predict observables in radiative B decays to vector mesons using holographic AdS/QCD Distribution Amplitudes for the vector mesons. We find that end-point divergences can be avoided when computing power-suppressed contributions in the heavy quark limit. The results reported here can be found in references [1] and [2].
|
1005.3370
|
Oleg Andreev
|
Oleg Andreev
|
Renormalized Field Strength Correlators in SU(N) Gauge Theory and
Gauge/String Duality
|
9 pages, 2 figures; v2: new prediction added, discussion improved, to
appear in Phys.Lett.B
|
Phys.Lett.B695:247-251,2011
|
10.1016/j.physletb.2010.11.029
|
LMU-ASC 31/10
|
hep-ph hep-lat hep-th nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We use gauge/string duality to analytically evaluate correlation lengths of
the renormalized field strength correlators in pure Yang-Mills theories at zero
and finite temperature.
|
[
{
"created": "Wed, 19 May 2010 07:23:39 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Nov 2010 09:09:21 GMT",
"version": "v2"
}
] |
2011-02-25
|
[
[
"Andreev",
"Oleg",
""
]
] |
We use gauge/string duality to analytically evaluate correlation lengths of the renormalized field strength correlators in pure Yang-Mills theories at zero and finite temperature.
|
hep-ph/0405027
|
Egle Tomasi-Gustafsson
|
Michail P. Rekalo and Egle Tomasi-Gustafsson
|
$P$-parity of charm and strange particles in electroproduction
processes, in collinear regime
|
4 pages
|
Phys.Lett. B599 (2004) 247-252
|
10.1016/j.physletb.2004.08.037
| null |
hep-ph
| null |
We show that definite polarization observables for the simplest
electroproduction processes, $\ell+N\to \ell+B(1/2^\pm)+M(0^\pm)$,
$B=Y(\Lambda, \Sigma$ or $Y_c$-hyperon, $\Theta^+$-pentaquark) and $M=K$,
$\bar{K}$ or $D$, are sensitive to the relative P-parity $\pi(B)$ of the
NBM-system. The interference of the longitudinal and transversal amplitudes for
the collinear regime of the processes $\gamma^*+N\to B+M $($\gamma^*$ is the
virtual photon) - at any value of momentum transfer squared and excitation
energy of the $BM$-system - generates model independent relations between
analyzing powers (in unpolarized lepton scattering by polarized target), from
one side, and the components of the produced baryon $B$ polarization. It is
important to stress that these relations depend on the above mentioned
P-parity, and constitute a model independent method for the determination of
unknown parities of strange and charm particles.
|
[
{
"created": "Tue, 4 May 2004 13:19:27 GMT",
"version": "v1"
}
] |
2009-11-10
|
[
[
"Rekalo",
"Michail P.",
""
],
[
"Tomasi-Gustafsson",
"Egle",
""
]
] |
We show that definite polarization observables for the simplest electroproduction processes, $\ell+N\to \ell+B(1/2^\pm)+M(0^\pm)$, $B=Y(\Lambda, \Sigma$ or $Y_c$-hyperon, $\Theta^+$-pentaquark) and $M=K$, $\bar{K}$ or $D$, are sensitive to the relative P-parity $\pi(B)$ of the NBM-system. The interference of the longitudinal and transversal amplitudes for the collinear regime of the processes $\gamma^*+N\to B+M $($\gamma^*$ is the virtual photon) - at any value of momentum transfer squared and excitation energy of the $BM$-system - generates model independent relations between analyzing powers (in unpolarized lepton scattering by polarized target), from one side, and the components of the produced baryon $B$ polarization. It is important to stress that these relations depend on the above mentioned P-parity, and constitute a model independent method for the determination of unknown parities of strange and charm particles.
|
hep-ph/0010110
|
Herbert Weigel
|
H. Weigel
|
Strongly Distorted Baryon Wave-Functions: Hyperon Beta-Decay and the
Spin of the Lambda and the Nucleon
|
Talk presented at the international conference `Symmetry and Spin'
Prague, July 2000. To appear in the Proceedings. 6 pages LaTeX
| null | null |
MIT-CTP-3017
|
hep-ph
| null |
Within the collective coordinate approach to chiral soliton models we suggest
that breaking of SU(3) flavor symmetry mainly resides in the baryon
wave-functions while the charge operators have no (or only small) symmetry
breaking components. In this framework we study the $g_A/g_V$ ratios for
hyperon beta-decay as well as the various quark flavor components of the axial
charge of the nucleon and the $\Lambda$-hyperon.
|
[
{
"created": "Wed, 11 Oct 2000 11:59:07 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Weigel",
"H.",
""
]
] |
Within the collective coordinate approach to chiral soliton models we suggest that breaking of SU(3) flavor symmetry mainly resides in the baryon wave-functions while the charge operators have no (or only small) symmetry breaking components. In this framework we study the $g_A/g_V$ ratios for hyperon beta-decay as well as the various quark flavor components of the axial charge of the nucleon and the $\Lambda$-hyperon.
|
1809.02539
|
A. B. Balantekin
|
A.B. Balantekin
|
Symmetries and Algebraic Methods in Neutrino Physics
|
19 pages of latex
| null | null | null |
hep-ph astro-ph.SR nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Symmetry properties associated with neutrino propagation with or without a
background of other particles, including neutrinos, is reviewed. The utility of
symmetries is illustrated with examples chosen from the see-saw mechanism and
both matter-enhanced and collective neutrino oscillations. The role of
symmetries in neutrino astrophysics is highlighted.
|
[
{
"created": "Fri, 7 Sep 2018 15:29:38 GMT",
"version": "v1"
}
] |
2018-09-10
|
[
[
"Balantekin",
"A. B.",
""
]
] |
Symmetry properties associated with neutrino propagation with or without a background of other particles, including neutrinos, is reviewed. The utility of symmetries is illustrated with examples chosen from the see-saw mechanism and both matter-enhanced and collective neutrino oscillations. The role of symmetries in neutrino astrophysics is highlighted.
|
0809.3210
|
Leonard Lesniak
|
L. Lesniak
|
New parameterization of the resonant production amplitudes near an
inelastic threshold
|
4 pages, 1 figure, contribution to MESON 2008, Tenth International
Workshop on Meson Production, Properties and Interaction, 6-10 June, Krakow,
Poland, to be published in International Journal of Modern Physics A
| null |
10.1142/S0217751X09044048
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
New formulae for the resonant scattering and the production amplitudes near
an inelastic threshold are derived. It is shown that the Flatte formula,
frequently used in experimental analyses, is not sufficiently accurate. Its
application to data analysis can lead to a substantial distortion of the
effective mass spectra and of the resonance pole positions.
A unitary parameterization, satisfying a generalized Watson theorem for the
production amplitudes, is proposed. It can be easily applied to study
production processes, multichannel meson-meson interactions and the resonance
properties, including among others the scalar resonances a0(980) and f_0(980).
|
[
{
"created": "Thu, 18 Sep 2008 17:18:32 GMT",
"version": "v1"
}
] |
2009-11-13
|
[
[
"Lesniak",
"L.",
""
]
] |
New formulae for the resonant scattering and the production amplitudes near an inelastic threshold are derived. It is shown that the Flatte formula, frequently used in experimental analyses, is not sufficiently accurate. Its application to data analysis can lead to a substantial distortion of the effective mass spectra and of the resonance pole positions. A unitary parameterization, satisfying a generalized Watson theorem for the production amplitudes, is proposed. It can be easily applied to study production processes, multichannel meson-meson interactions and the resonance properties, including among others the scalar resonances a0(980) and f_0(980).
|
hep-ph/9603313
|
Andre Hoang
|
K.G. Chetyrkin (MPI f\"ur Physik, Munich, Germany), A.H. Hoang, J.H.
Kuehn, M. Steinhauser (Uni. Karlsruhe, Germany), T. Teubner (Durham Uni., UK)
|
Double Bubble Corrections to Heavy Quark Production
|
9 pages, latex, 17 figures, the complete postscript file of this
preprint, including figures, is available via anonymous ftp at
ftp://www-ttp.physik.uni-karlsruhe.de/ttp96-04/ttp96-04.ps (129.13.102.139)
or via www at http://www-ttp.physik.uni-karlsruhe.de/cgi-bin/preprints/
|
Phys.Lett. B384 (1996) 233-240
|
10.1016/0370-2693(96)00789-7
|
TTP96-04, MPI/PhT/96-10, DPT/96/12
|
hep-ph
| null |
Second order ${\cal O}(\alpha_s^2)$ corrections to the heavy quark production
cross-section due to massless quarks and coloured scalars are calculated for
all energies above threshold. Based on the method introduced in this letter
also the gauge non-invariant second order corrections due to the pure gluonic
selfenergy insertion and a certain class of ${\cal{O}}(\alpha_s^3)$ and
${\cal{O}}(\alpha_s^4)$ corrections are determined. For the special choice of
the gauge parameter, $\xi=4$, the leading threshold and high energy behaviour
of the pure second order gluonic corrections to the cross-section are governed
by the gluonic self energy insertion.
|
[
{
"created": "Thu, 14 Mar 1996 16:09:23 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Chetyrkin",
"K. G.",
"",
"MPI für Physik, Munich, Germany"
],
[
"Hoang",
"A. H.",
"",
"Uni. Karlsruhe, Germany"
],
[
"Kuehn",
"J. H.",
"",
"Uni. Karlsruhe, Germany"
],
[
"Steinhauser",
"M.",
"",
"Uni. Karlsruhe, Germany"
],
[
"Teubner",
"T.",
"",
"Durham Uni., UK"
]
] |
Second order ${\cal O}(\alpha_s^2)$ corrections to the heavy quark production cross-section due to massless quarks and coloured scalars are calculated for all energies above threshold. Based on the method introduced in this letter also the gauge non-invariant second order corrections due to the pure gluonic selfenergy insertion and a certain class of ${\cal{O}}(\alpha_s^3)$ and ${\cal{O}}(\alpha_s^4)$ corrections are determined. For the special choice of the gauge parameter, $\xi=4$, the leading threshold and high energy behaviour of the pure second order gluonic corrections to the cross-section are governed by the gluonic self energy insertion.
|
2401.04137
|
Ashok Kapoor
|
A. K. Kapoor
|
Parisi-Wu Quantization, CP violation and Beyond the Standard Model
|
6 pages; accepted for publication in Mod. Phys. Letters A
| null | null | null |
hep-ph hep-th
|
http://creativecommons.org/licenses/by/4.0/
|
The Parisi-Wu scheme of quantization opens up the possibility of using
anomalous fermionic gauge theories. An analysis of ultra-violet divergences
reveals that the structure of counter terms is different from what is expected
in conventional quantization schemes. In this letter it is argued that there
exists a possible mechanism of CP violation that requires at least three
generations of quarks, a result well known from a phenomenological analysis of
mass mixing of quarks. A few observations on possible ways of going beyond the
standard model are included.
|
[
{
"created": "Sun, 7 Jan 2024 11:08:01 GMT",
"version": "v1"
}
] |
2024-01-10
|
[
[
"Kapoor",
"A. K.",
""
]
] |
The Parisi-Wu scheme of quantization opens up the possibility of using anomalous fermionic gauge theories. An analysis of ultra-violet divergences reveals that the structure of counter terms is different from what is expected in conventional quantization schemes. In this letter it is argued that there exists a possible mechanism of CP violation that requires at least three generations of quarks, a result well known from a phenomenological analysis of mass mixing of quarks. A few observations on possible ways of going beyond the standard model are included.
|
hep-ph/9603255
|
Gabriel Sanchez Colon
|
A. Garcia (1), R. Huerta (2), G. Sanchez-Colon (2) ((1) CINVESTAV-IPN
Mexico, (2) CINVESTAV-IPN Unidad Merida)
|
A Priori Mixed Baryons and Weak Radiative Decays
|
Final version
|
Rev.Mex.Fis. 43 (1996) 232-239
| null |
SMF1522
|
hep-ph
| null |
A priori mixings of eigenstates in physical states are quantum mechanical
effects well known in several realms of physics. The possibility that such
effects are also present in particle physics, in the form of flavor and parity
mixings, is studied. An application to weak radiative decays of hyperons is
discussed. It is suggested that this scheme may also be present in non-leptonic
and rare mode decays as the enhancement phenomenon.
|
[
{
"created": "Sat, 9 Mar 1996 04:37:05 GMT",
"version": "v1"
},
{
"created": "Thu, 12 Feb 1998 21:57:53 GMT",
"version": "v2"
}
] |
2008-02-03
|
[
[
"Garcia",
"A.",
""
],
[
"Huerta",
"R.",
""
],
[
"Sanchez-Colon",
"G.",
""
]
] |
A priori mixings of eigenstates in physical states are quantum mechanical effects well known in several realms of physics. The possibility that such effects are also present in particle physics, in the form of flavor and parity mixings, is studied. An application to weak radiative decays of hyperons is discussed. It is suggested that this scheme may also be present in non-leptonic and rare mode decays as the enhancement phenomenon.
|
1802.08253
|
Denis Bernard
|
Denis Bernard
|
A 5D, polarised, Bethe-Heitler event generator for $\gamma \to e^+e^-$
conversion
|
Submitted to Nucl. Instrum. Meth. A
|
Nucl. Instrum. Meth., A 899 (2018) 85
|
10.1016/j.nima.2018.05.021
| null |
hep-ph astro-ph.IM physics.data-an physics.ins-det
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We describe a new version of the 5D, exact, polarised, Bethe-Heitler event
generator of $\gamma$-ray conversions to $e^+e^-$, developed in the context of
the HARPO project, that is able to simulate successive events with different
photon energies and on different atomic targets without any substantial CPU
overhead. The strong correlation between kinematic variables in the divergence
of the five-dimensional differential cross section are mitigated by performing
each step of the conversion in the appropriate Lorentz frame. We extend the
verification range down to 1 keV above threshold and up to 1 EeV. This work
could pave the way to the precise simulation of the high-performance
$\gamma$-ray telescopes and polarimeters of the post-Fermi-LAT area.
|
[
{
"created": "Thu, 22 Feb 2018 16:04:36 GMT",
"version": "v1"
},
{
"created": "Thu, 3 May 2018 17:35:56 GMT",
"version": "v2"
}
] |
2018-06-05
|
[
[
"Bernard",
"Denis",
""
]
] |
We describe a new version of the 5D, exact, polarised, Bethe-Heitler event generator of $\gamma$-ray conversions to $e^+e^-$, developed in the context of the HARPO project, that is able to simulate successive events with different photon energies and on different atomic targets without any substantial CPU overhead. The strong correlation between kinematic variables in the divergence of the five-dimensional differential cross section are mitigated by performing each step of the conversion in the appropriate Lorentz frame. We extend the verification range down to 1 keV above threshold and up to 1 EeV. This work could pave the way to the precise simulation of the high-performance $\gamma$-ray telescopes and polarimeters of the post-Fermi-LAT area.
|
0901.0426
|
Gui-Jun Ding
|
Gui-Jun Ding, Jia-Feng Liu and Mu-Lin Yan
|
Dynamics of Hadronic Molecule in One-Boson Exchange Approach and
Possible Heavy Flavor Molecules
|
21 pages, 11 figures, 8 tables
|
Phys.Rev.D79:054005,2009
|
10.1103/PhysRevD.79.054005
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We extend the one pion exchange model at quark level to include the short
distance contributions coming from $\eta$, $\sigma$, $\rho$ and $\omega$
exchange. This formalism is applied to discuss the possible molecular states of
$D\bar{D}^{*}/\bar{D}D^{*}$, $B\bar{B}^{*}/\bar{B}B^{*}$, $DD^{*}$, $BB^{*}$,
the pseudoscalar-vector systems with $C=B=1$ and $C=-B=1$ respectively. The
"$\delta$ function" term contribution and the S-D mixing effects have been
taken into account. We find the conclusions reached after including the heavier
mesons exchange are qualitatively the same as those in the one pion exchange
model. The previous suggestion that $1^{++}$ $B\bar{B}^{*}/\bar{B}B^{*}$
molecule should exist, is confirmed in the one boson exchange model, whereas
$DD^{*}$ bound state should not exist. The $D\bar{D}^{*}/\bar{D}D^{*}$ system
can accomodate a $1^{++}$ molecule close to the threshold, the mixing between
the molecule and the conventional charmonium has to be considered to identify
this state with X(3872). For the $BB^{*}$ system, the pseudoscalar-vector
systems with $C=B=1$ and $C=-B=1$, near threshold molecular states may exist.
These bound states should be rather narrow, isospin is violated and the I=0
component is dominant. Experimental search channels for these states are
suggested.
|
[
{
"created": "Mon, 5 Jan 2009 07:34:35 GMT",
"version": "v1"
},
{
"created": "Sat, 11 Apr 2009 07:33:23 GMT",
"version": "v2"
}
] |
2009-04-13
|
[
[
"Ding",
"Gui-Jun",
""
],
[
"Liu",
"Jia-Feng",
""
],
[
"Yan",
"Mu-Lin",
""
]
] |
We extend the one pion exchange model at quark level to include the short distance contributions coming from $\eta$, $\sigma$, $\rho$ and $\omega$ exchange. This formalism is applied to discuss the possible molecular states of $D\bar{D}^{*}/\bar{D}D^{*}$, $B\bar{B}^{*}/\bar{B}B^{*}$, $DD^{*}$, $BB^{*}$, the pseudoscalar-vector systems with $C=B=1$ and $C=-B=1$ respectively. The "$\delta$ function" term contribution and the S-D mixing effects have been taken into account. We find the conclusions reached after including the heavier mesons exchange are qualitatively the same as those in the one pion exchange model. The previous suggestion that $1^{++}$ $B\bar{B}^{*}/\bar{B}B^{*}$ molecule should exist, is confirmed in the one boson exchange model, whereas $DD^{*}$ bound state should not exist. The $D\bar{D}^{*}/\bar{D}D^{*}$ system can accomodate a $1^{++}$ molecule close to the threshold, the mixing between the molecule and the conventional charmonium has to be considered to identify this state with X(3872). For the $BB^{*}$ system, the pseudoscalar-vector systems with $C=B=1$ and $C=-B=1$, near threshold molecular states may exist. These bound states should be rather narrow, isospin is violated and the I=0 component is dominant. Experimental search channels for these states are suggested.
|
hep-ph/9803401
|
Steven Abel
|
S. A. Abel, W. N. Cottingham, I. B. Whittingham
|
Gluon and gluino penguins and the charmless decays of the b quark
|
30 Pages plain latex; includes 8 eps figures
|
Phys.Rev.D58:073006,1998
|
10.1103/PhysRevD.58.073006
|
CERN-TH 98/87
|
hep-ph
| null |
Gluon mediated exclusive hadronic decays of b quarks are studied within the
standard model (SM) and the constrained minimally supersymmetric standard model
(MSSM). For all allowed regions of the MSSM parameter space (A, tan beta, m_0,
m_{1/2}) the penguin magnetic dipole form factor F^R_2 is dominant over the
electric dipole and can be larger than the magnetic dipole form factor of the
SM. However, overall the SM electric dipole decay amplitude F^L_1 dominates the
decay rate. The MSSM penguin contributions to the free quark decay rate
approach the 10% level for those regions of parameter space close to the
highest allowed values of tan beta (~55) for which the gluino is light
(m_{\tilde{g}} \approx 360 GeV) and lies within the range of the six d-squark
masses. In these regions the supersymmetric box amplitudes are negligible. The
MSSM phases change very little over the allowed parameter space and can lead to
significant interference with the SM amplitudes.
|
[
{
"created": "Fri, 20 Mar 1998 13:17:30 GMT",
"version": "v1"
}
] |
2011-01-25
|
[
[
"Abel",
"S. A.",
""
],
[
"Cottingham",
"W. N.",
""
],
[
"Whittingham",
"I. B.",
""
]
] |
Gluon mediated exclusive hadronic decays of b quarks are studied within the standard model (SM) and the constrained minimally supersymmetric standard model (MSSM). For all allowed regions of the MSSM parameter space (A, tan beta, m_0, m_{1/2}) the penguin magnetic dipole form factor F^R_2 is dominant over the electric dipole and can be larger than the magnetic dipole form factor of the SM. However, overall the SM electric dipole decay amplitude F^L_1 dominates the decay rate. The MSSM penguin contributions to the free quark decay rate approach the 10% level for those regions of parameter space close to the highest allowed values of tan beta (~55) for which the gluino is light (m_{\tilde{g}} \approx 360 GeV) and lies within the range of the six d-squark masses. In these regions the supersymmetric box amplitudes are negligible. The MSSM phases change very little over the allowed parameter space and can lead to significant interference with the SM amplitudes.
|
hep-ph/0104302
|
Fayet
|
Pierre Fayet
|
About Superpartners and the Origins of the Supersymmetric Standard Model
|
15 pages. Contribution to ``The Supersymmetric World'' - The
Beginnings of the Theory'', G. Kane and M. Shifman eds. (World Scientific,
2000), p. 120
| null | null |
LPTENS-00/
|
hep-ph
| null |
We recall the obstacles which seemed, long ago, to prevent supersymmetry from
possibly being a fundamental symmetry of Nature. Which bosons and fermions
could be related? Is spontaneous supersymmetry breaking possible? Where is the
spin-1/2 Goldstone fermion of supersymmetry? Can one define conserved baryon
and lepton numbers in such theories, although they systematically involve
self-conjugate Majorana fermions? etc.. We then recall how an early attempt to
relate the photon with a ``neutrino'' led to the definition of R-invariance,
but that this ``neutrino'' had to be reinterpreted as a new particle, the
photino. This led us to the Supersymmetric Standard Model, involving the SU(3)
x SU(2) x U(1) gauge interactions of chiral quark and lepton superfields, and
of two doublet Higgs superfields responsible for the electroweak breaking and
the generation of quark and lepton masses. The original continuous R-invariance
was then abandoned in favor of its discrete version, R-parity -- reexpressed as
(-1)^2S (-1)^(3B+L) -- so that the gravitino and gluinos can acquire masses. We
also comment about supersymmetry breaking.
|
[
{
"created": "Sun, 29 Apr 2001 21:25:53 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Fayet",
"Pierre",
""
]
] |
We recall the obstacles which seemed, long ago, to prevent supersymmetry from possibly being a fundamental symmetry of Nature. Which bosons and fermions could be related? Is spontaneous supersymmetry breaking possible? Where is the spin-1/2 Goldstone fermion of supersymmetry? Can one define conserved baryon and lepton numbers in such theories, although they systematically involve self-conjugate Majorana fermions? etc.. We then recall how an early attempt to relate the photon with a ``neutrino'' led to the definition of R-invariance, but that this ``neutrino'' had to be reinterpreted as a new particle, the photino. This led us to the Supersymmetric Standard Model, involving the SU(3) x SU(2) x U(1) gauge interactions of chiral quark and lepton superfields, and of two doublet Higgs superfields responsible for the electroweak breaking and the generation of quark and lepton masses. The original continuous R-invariance was then abandoned in favor of its discrete version, R-parity -- reexpressed as (-1)^2S (-1)^(3B+L) -- so that the gravitino and gluinos can acquire masses. We also comment about supersymmetry breaking.
|
2109.12041
|
Paul Caucal
|
Paul Caucal, Yacine Mehtar-Tani
|
Anomalous diffusion in QCD matter
|
10 pages, 3 figures, 3 supplemental materials
| null |
10.1103/PhysRevD.106.L051501
| null |
hep-ph cond-mat.stat-mech nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the effects of quantum corrections on transverse momentum broadening
of a fast parton passing through dense QCD matter. We show that, at leading
logarithmic accuracy the broadening distribution tends at late times or
equivalently for large system sizes $L$ to a universal distribution that only
depends on a single scaling variable $k^2_\perp/Q^2_s$ where the typical
transverse momentum scale increases with time as $\ln Q_s^2 \simeq (1+2 \beta )
\ln L - \frac{3}{2}(1+\beta )\,\ln\ln L$ up to non-universal terms, with an
anomalous dimension $\beta \sim \sqrt{\alpha_s} $. This property is analogous
to geometric scaling of gluon distributions in the saturation regime and
traveling waves solutions to reaction-diffusion processes. We note that since
$\beta >0$ the process is super-diffusive, which is also reflected at large
transverse momentum where the scaling distribution exhibits a heavy tail
$k_\perp^{4-2\beta }$ akin to L\'{e}vy random walks.
|
[
{
"created": "Fri, 24 Sep 2021 15:54:14 GMT",
"version": "v1"
}
] |
2022-10-05
|
[
[
"Caucal",
"Paul",
""
],
[
"Mehtar-Tani",
"Yacine",
""
]
] |
We study the effects of quantum corrections on transverse momentum broadening of a fast parton passing through dense QCD matter. We show that, at leading logarithmic accuracy the broadening distribution tends at late times or equivalently for large system sizes $L$ to a universal distribution that only depends on a single scaling variable $k^2_\perp/Q^2_s$ where the typical transverse momentum scale increases with time as $\ln Q_s^2 \simeq (1+2 \beta ) \ln L - \frac{3}{2}(1+\beta )\,\ln\ln L$ up to non-universal terms, with an anomalous dimension $\beta \sim \sqrt{\alpha_s} $. This property is analogous to geometric scaling of gluon distributions in the saturation regime and traveling waves solutions to reaction-diffusion processes. We note that since $\beta >0$ the process is super-diffusive, which is also reflected at large transverse momentum where the scaling distribution exhibits a heavy tail $k_\perp^{4-2\beta }$ akin to L\'{e}vy random walks.
|
1310.6611
|
Michal Deak Dr.
|
Grigorios Chachamis, Michal Deak, German Rodrigo
|
Heavy quark impact factor in kT-factorization
|
15 pages, 3 figures
| null |
10.1007/JHEP12(2013)066
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present the calculation of the finite part of the heavy quark impact
factor at next-to-leading logarithmic accuracy in a form suitable for
phenomenological studies such as the calculation of the cross-section for
single bottom quark production at the LHC within the kT-factorization scheme.
|
[
{
"created": "Thu, 24 Oct 2013 13:34:50 GMT",
"version": "v1"
}
] |
2015-06-17
|
[
[
"Chachamis",
"Grigorios",
""
],
[
"Deak",
"Michal",
""
],
[
"Rodrigo",
"German",
""
]
] |
We present the calculation of the finite part of the heavy quark impact factor at next-to-leading logarithmic accuracy in a form suitable for phenomenological studies such as the calculation of the cross-section for single bottom quark production at the LHC within the kT-factorization scheme.
|
1404.6493
|
Gabriel Abelof
|
Gabriel Abelof, Aude Gehrmann-De Ridder, Philipp Maierh\"ofer, Stefano
Pozzorini
|
NNLO QCD subtraction for top-antitop production in the $q\bar{q}$
channel
|
54 pages, 10 figures
| null |
10.1007/JHEP08(2014)035
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present the computation of the double real and real-virtual contributions
to top-antitop pair production in the quark-antiquark channel at leading
colour. The $q \bar q \to t \bar{t} g$ amplitudes contributing to the
real-virtual part are computed with OpenLoops, and their numerical stability in
the soft and collinear regions is found to be sufficiently high to perform a
realistic NNLO calculation in double precision. The subtraction terms required
at real-real and real-virtual levels are constructed within the antenna
subtraction formalism extended to deal with the presence of coloured massive
final state particles. We show that those subtraction terms approximate the
real-real and real-virtual matrix elements in all their singular limits.
|
[
{
"created": "Fri, 25 Apr 2014 18:13:51 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Aug 2014 19:32:47 GMT",
"version": "v2"
}
] |
2015-06-19
|
[
[
"Abelof",
"Gabriel",
""
],
[
"Ridder",
"Aude Gehrmann-De",
""
],
[
"Maierhöfer",
"Philipp",
""
],
[
"Pozzorini",
"Stefano",
""
]
] |
We present the computation of the double real and real-virtual contributions to top-antitop pair production in the quark-antiquark channel at leading colour. The $q \bar q \to t \bar{t} g$ amplitudes contributing to the real-virtual part are computed with OpenLoops, and their numerical stability in the soft and collinear regions is found to be sufficiently high to perform a realistic NNLO calculation in double precision. The subtraction terms required at real-real and real-virtual levels are constructed within the antenna subtraction formalism extended to deal with the presence of coloured massive final state particles. We show that those subtraction terms approximate the real-real and real-virtual matrix elements in all their singular limits.
|
1609.04605
|
Hiroaki Abuki
|
H. Abuki
|
Chiral spiral induced by a strong magnetic field
|
6 pages, 6 eps figures. Presented at QCD@Work 2016: International
Workshop on QCD - Theory and Experiment, June 27-30, Martina-Franca (Italy)
| null |
10.1051/epjconf/201612900036
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the modification of the chiral phase structure of QCD due to an
external magnetic field. We first demonstrate how the effect of magnetic field
can systematically be incorporated into a generalized Ginzburg-Landau
framework. We then analyze the phase structure in the vicinity of the chiral
critical point. In the chiral limit, the effect is found to be so drastic that
it totally washes the tricritical point out of the phase diagram, bringing the
continent for the chiral spiral. This is the case no matter how small is the
intensity of the magnetic field. On the other hand, the current quark mass
protects the chiral critical point from a weak magnetic field. However the
critical point will eventually be covered by the chiral spiral phase as the
magnetic field grows.
|
[
{
"created": "Thu, 15 Sep 2016 12:42:27 GMT",
"version": "v1"
}
] |
2018-09-19
|
[
[
"Abuki",
"H.",
""
]
] |
We study the modification of the chiral phase structure of QCD due to an external magnetic field. We first demonstrate how the effect of magnetic field can systematically be incorporated into a generalized Ginzburg-Landau framework. We then analyze the phase structure in the vicinity of the chiral critical point. In the chiral limit, the effect is found to be so drastic that it totally washes the tricritical point out of the phase diagram, bringing the continent for the chiral spiral. This is the case no matter how small is the intensity of the magnetic field. On the other hand, the current quark mass protects the chiral critical point from a weak magnetic field. However the critical point will eventually be covered by the chiral spiral phase as the magnetic field grows.
|
2309.07838
|
Ulrich Ellwanger
|
Ulrich Ellwanger, Cyril Hugonie
|
Additional Higgs Bosons near 95 and 650 GeV in the NMSSM
|
17 pages, 13 figures, added properties of charged Higgs bosons and
references, modified constraints from couplings of H_SM
| null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
Hints for an additional Higgs boson with a mass of about 95 GeV originate
from LEP and searches in the diphoton channel by CMS and ATLAS. A search for
resonant production of SM plus BSM Higgs bosons in the diphoton plus bb channel
by CMS showed some excess for a 650 GeV resonance decaying into the SM Higgs
plus a 95 GeV Higgs boson. We investigate whether these phenomena can be
interpreted simultaneously within the NMSSM subject to the latest constraints
on couplings of the SM Higgs boson, on extra Higgs bosons from the LHC, and on
dark matter direct detection cross sections. We find that the hints for a 95
GeV Higgs boson in the diphoton channel by CMS and ATLAS and in the diphoton
plus bb channel by CMS can be fitted simultaneously within the 2 sigma level.
|
[
{
"created": "Thu, 14 Sep 2023 16:32:00 GMT",
"version": "v1"
},
{
"created": "Fri, 1 Dec 2023 16:53:55 GMT",
"version": "v2"
}
] |
2023-12-04
|
[
[
"Ellwanger",
"Ulrich",
""
],
[
"Hugonie",
"Cyril",
""
]
] |
Hints for an additional Higgs boson with a mass of about 95 GeV originate from LEP and searches in the diphoton channel by CMS and ATLAS. A search for resonant production of SM plus BSM Higgs bosons in the diphoton plus bb channel by CMS showed some excess for a 650 GeV resonance decaying into the SM Higgs plus a 95 GeV Higgs boson. We investigate whether these phenomena can be interpreted simultaneously within the NMSSM subject to the latest constraints on couplings of the SM Higgs boson, on extra Higgs bosons from the LHC, and on dark matter direct detection cross sections. We find that the hints for a 95 GeV Higgs boson in the diphoton channel by CMS and ATLAS and in the diphoton plus bb channel by CMS can be fitted simultaneously within the 2 sigma level.
|
2304.10753
|
Werner Porod
|
Werner Porod
|
Hunting scalar partners of the Higgs boson at the LHC
|
Contribution to the Corfu Summer Institute 2022 "School and Workshops
on Elementary Particle Physics and Gravity"
| null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
Composite Higgs models with a fermionic ultraviolet completion predict in
general additional pseudo Nambu Goldstone bosons beside the Higgs multiplet. In
this contribution we discuss their LHC signatures and present first bounds in
simplified models which can also be applied to generic models like multi-Higgs
models. We then demonstrate how these can be combined taking a concrete model
based on the SU(5)/SO(5) coset as an example. We use this to show how a proper
combination of different channels can lead to an improved bound compared to a
single channel analysis.
|
[
{
"created": "Fri, 21 Apr 2023 05:51:07 GMT",
"version": "v1"
}
] |
2023-04-24
|
[
[
"Porod",
"Werner",
""
]
] |
Composite Higgs models with a fermionic ultraviolet completion predict in general additional pseudo Nambu Goldstone bosons beside the Higgs multiplet. In this contribution we discuss their LHC signatures and present first bounds in simplified models which can also be applied to generic models like multi-Higgs models. We then demonstrate how these can be combined taking a concrete model based on the SU(5)/SO(5) coset as an example. We use this to show how a proper combination of different channels can lead to an improved bound compared to a single channel analysis.
|
1202.0284
|
John Kearney
|
John Kearney and Aaron Pierce
|
Neutrinos from Off-Shell Final States and the Indirect Detection of Dark
Matter
|
22 pages, 5 figures
| null |
10.1103/PhysRevD.86.043527
|
MCTP-12-02
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We revisit the annihilation of dark matter to neutrinos in the Sun near the
WW and tt kinematic thresholds. We investigate the potential importance of
annihilation to WW* in a minimal dark matter model in which a Majorana singlet
is mixed with a vector-like electroweak doublet, but many results generalize to
other models of weakly-interacting dark matter. We re-evaluate the indirect
detection constraints on this model and find that, once all annihilation
channels are properly taken into account, the most stringent constraints on
spin-dependent scattering for dark matter mass 60 GeV < mX < mt are derived
from the results of the Super-Kamiokande experiment. Moreover, we establish the
model-independent statement that Majorana dark matter whose thermal relic
abundance and neutrino signals are both controlled by annihilation via an
s-channel Z boson is excluded for 70 GeV < mX < mW. In some models,
annihilation to tt* can affect indirect detection, notably by competing with
annihilation to gauge boson final states and thereby weakening neutrino
signals. However, in the minimal model, this final state is largely negligible,
only allowing dark matter with mass a few GeV below the top quark mass to evade
exclusion.
|
[
{
"created": "Wed, 1 Feb 2012 21:00:02 GMT",
"version": "v1"
}
] |
2013-05-30
|
[
[
"Kearney",
"John",
""
],
[
"Pierce",
"Aaron",
""
]
] |
We revisit the annihilation of dark matter to neutrinos in the Sun near the WW and tt kinematic thresholds. We investigate the potential importance of annihilation to WW* in a minimal dark matter model in which a Majorana singlet is mixed with a vector-like electroweak doublet, but many results generalize to other models of weakly-interacting dark matter. We re-evaluate the indirect detection constraints on this model and find that, once all annihilation channels are properly taken into account, the most stringent constraints on spin-dependent scattering for dark matter mass 60 GeV < mX < mt are derived from the results of the Super-Kamiokande experiment. Moreover, we establish the model-independent statement that Majorana dark matter whose thermal relic abundance and neutrino signals are both controlled by annihilation via an s-channel Z boson is excluded for 70 GeV < mX < mW. In some models, annihilation to tt* can affect indirect detection, notably by competing with annihilation to gauge boson final states and thereby weakening neutrino signals. However, in the minimal model, this final state is largely negligible, only allowing dark matter with mass a few GeV below the top quark mass to evade exclusion.
|
2309.05474
|
Peter Athron
|
Peter Athron, Lachlan Morris, Zhongxiu Xu
|
How robust are gravitational wave predictions from cosmological phase
transitions?
|
14 pages, 5 figures, 3 tables; matches version published in JCAP
|
JCAP 05 (2024) 075
| null | null |
hep-ph astro-ph.CO
|
http://creativecommons.org/licenses/by/4.0/
|
Gravitational wave (GW) predictions of cosmological phase transitions are
almost invariably evaluated at either the nucleation or percolation
temperature. We investigate the effect of the transition temperature choice on
GW predictions, for phase transitions with weak, intermediate and strong
supercooling. We find that the peak amplitude of the GW signal varies by a
factor of a few for weakly supercooled phase transitions, and by an order of
magnitude for strongly supercooled phase transitions. The variation in
amplitude for even weakly supercooled phase transitions can be several orders
of magnitude if one uses the mean bubble separation, while the variation is
milder if one uses the mean bubble radius instead. We also investigate the
impact of various approximations used in GW predictions. Many of these
approximations introduce at least a 10% error in the GW signal, with others
introducing an error of over an order of magnitude.
|
[
{
"created": "Mon, 11 Sep 2023 14:15:08 GMT",
"version": "v1"
},
{
"created": "Tue, 21 May 2024 08:46:57 GMT",
"version": "v2"
}
] |
2024-05-22
|
[
[
"Athron",
"Peter",
""
],
[
"Morris",
"Lachlan",
""
],
[
"Xu",
"Zhongxiu",
""
]
] |
Gravitational wave (GW) predictions of cosmological phase transitions are almost invariably evaluated at either the nucleation or percolation temperature. We investigate the effect of the transition temperature choice on GW predictions, for phase transitions with weak, intermediate and strong supercooling. We find that the peak amplitude of the GW signal varies by a factor of a few for weakly supercooled phase transitions, and by an order of magnitude for strongly supercooled phase transitions. The variation in amplitude for even weakly supercooled phase transitions can be several orders of magnitude if one uses the mean bubble separation, while the variation is milder if one uses the mean bubble radius instead. We also investigate the impact of various approximations used in GW predictions. Many of these approximations introduce at least a 10% error in the GW signal, with others introducing an error of over an order of magnitude.
|
0806.2817
|
Vladimir Sauli
|
V. Sauli, Z. Batiz
|
Quark Schwinger-Dyson equation in temporal Euclidean space
|
11 pages, grammar and typos corrected
|
J.Phys.G36:035002,2009
|
10.1088/0954-3899/36/3/035002
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present an elementary nonperturbative method to obtain Green's functions
(GFs) for timelike momenta. We assume there are no singularities in the first
and third quadrants of the complex plane of space momentum components and
perform a 3d analogue of Wick rotation. This procedure defines Greens functions
in a timelike Euclidean space. As an example we consider the quark propagator
in QCD. While for weak coupling, this method is obviously equivalent to
perturbation theory, for a realistic QCD coupling a complex part of the quark
mass and renormalization wave function has been spontaneously generated even
below the standard perturbative threshold. Therefore, our method favors a
confinement mechanism based on the lack of real poles.
|
[
{
"created": "Tue, 17 Jun 2008 15:14:25 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Dec 2008 15:53:23 GMT",
"version": "v2"
}
] |
2009-02-02
|
[
[
"Sauli",
"V.",
""
],
[
"Batiz",
"Z.",
""
]
] |
We present an elementary nonperturbative method to obtain Green's functions (GFs) for timelike momenta. We assume there are no singularities in the first and third quadrants of the complex plane of space momentum components and perform a 3d analogue of Wick rotation. This procedure defines Greens functions in a timelike Euclidean space. As an example we consider the quark propagator in QCD. While for weak coupling, this method is obviously equivalent to perturbation theory, for a realistic QCD coupling a complex part of the quark mass and renormalization wave function has been spontaneously generated even below the standard perturbative threshold. Therefore, our method favors a confinement mechanism based on the lack of real poles.
|
hep-ph/0007176
|
Wilfried Buchmuller
|
W. Buchm\"uller and M. Pl\"umacher
|
Neutrino masses and the baryon asymmetry
|
45 pages, 12 figures
|
Int.J.Mod.Phys.A15:5047-5086,2000
|
10.1016/S0217-751X(00)00293-5
|
DESY 99-187, UPR-892-T
|
hep-ph
| null |
Due to sphaleron processes in the high-temperature symmetric phase of the
standard model the cosmological baryon asymmetry is related to neutrino
properties. For hierarchical neutrino masses, with $B-L$ broken at the
unification scale $\Lambda_{GUT}\sim 10^{16} $GeV, the observed baryon
asymmetry $n_B/s \sim 10^{-10}$ can be naturally explained by the decay of
heavy Majorana neutrinos. We illustrate this mechanism with two models of
neutrino masses, consistent with the solar and atmospheric neutrino anomalies,
which are based on the two symmetry groups $SU(5)\times U(1)_F$ and
$SU(3)_c\times SU(3)_L\times SU(3)_R\times U(1)_F$.
We also review related cosmological bounds on Majorana neutrino masses and
the use of Boltzmann equations.
|
[
{
"created": "Mon, 17 Jul 2000 19:50:43 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Buchmüller",
"W.",
""
],
[
"Plümacher",
"M.",
""
]
] |
Due to sphaleron processes in the high-temperature symmetric phase of the standard model the cosmological baryon asymmetry is related to neutrino properties. For hierarchical neutrino masses, with $B-L$ broken at the unification scale $\Lambda_{GUT}\sim 10^{16} $GeV, the observed baryon asymmetry $n_B/s \sim 10^{-10}$ can be naturally explained by the decay of heavy Majorana neutrinos. We illustrate this mechanism with two models of neutrino masses, consistent with the solar and atmospheric neutrino anomalies, which are based on the two symmetry groups $SU(5)\times U(1)_F$ and $SU(3)_c\times SU(3)_L\times SU(3)_R\times U(1)_F$. We also review related cosmological bounds on Majorana neutrino masses and the use of Boltzmann equations.
|
1708.00010
|
Chanda Prescod-Weinstein
|
Ann Nelson and Chanda Prescod-Weinstein
|
Relaxion: A Landscape Without Anthropics
|
updated with new section; similar to version to be published in
Physical Review D
|
Phys. Rev. D 96, 113007 (2017)
|
10.1103/PhysRevD.96.113007
| null |
hep-ph astro-ph.CO hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The relaxion mechanism provides a potentially elegant solution to the
hierarchy problem without resorting to anthropic or other fine-tuning
arguments. This mechanism introduces an axion-like field, dubbed the relaxion,
whose expectation value determines the electroweak hierarchy as well as the QCD
strong CP violating $\bar{\theta}$ parameter. During an inflationary period,
the Higgs mass squared is selected to be negative and hierarchically small in a
theory which is consistent with 't Hooft's technical naturalness criteria.
However, in the original model proposed by Graham, Kaplan and Rajendran (2015),
the relaxion does not solve the strong CP problem, and in fact contributes to
it, as the coupling of the relaxion to the Higgs field and the introduction of
a linear potential for the relaxion produces large strong CP violation. We
resolve this tension by considering inflation with a Hubble scale which is
above the QCD scale but below the weak scale, and estimating the Hubble
temperature dependence of the axion mass. The relaxion potential is thus very
different during inflation than it is today. We find that provided the
inflationary Hubble scale is between the weak scale and about 3 GeV, the
relaxion resolves the hierarchy, strong CP, and dark matter problems in a way
that is technically natural.
|
[
{
"created": "Mon, 31 Jul 2017 18:00:07 GMT",
"version": "v1"
},
{
"created": "Fri, 15 Dec 2017 16:18:53 GMT",
"version": "v2"
}
] |
2017-12-27
|
[
[
"Nelson",
"Ann",
""
],
[
"Prescod-Weinstein",
"Chanda",
""
]
] |
The relaxion mechanism provides a potentially elegant solution to the hierarchy problem without resorting to anthropic or other fine-tuning arguments. This mechanism introduces an axion-like field, dubbed the relaxion, whose expectation value determines the electroweak hierarchy as well as the QCD strong CP violating $\bar{\theta}$ parameter. During an inflationary period, the Higgs mass squared is selected to be negative and hierarchically small in a theory which is consistent with 't Hooft's technical naturalness criteria. However, in the original model proposed by Graham, Kaplan and Rajendran (2015), the relaxion does not solve the strong CP problem, and in fact contributes to it, as the coupling of the relaxion to the Higgs field and the introduction of a linear potential for the relaxion produces large strong CP violation. We resolve this tension by considering inflation with a Hubble scale which is above the QCD scale but below the weak scale, and estimating the Hubble temperature dependence of the axion mass. The relaxion potential is thus very different during inflation than it is today. We find that provided the inflationary Hubble scale is between the weak scale and about 3 GeV, the relaxion resolves the hierarchy, strong CP, and dark matter problems in a way that is technically natural.
|
2004.01111
|
Marta Luszczak Mrs
|
Marta {\L}uszczak and Antoni Szczurek
|
Production of heavy particle pairs via photon-photon processes at the
LHC
|
11 pages, 9 figures, a talk presented by Marta {\L}uszczak at XXVI
Cracow EPIPHANY Conference, LHC Physics: Standard Model and Beyond, 7-10
January 2020
| null |
10.5506/APhysPolB.51.1449
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss production of $W^+ W^-$ pairs and $t \bar t$ quark-antiquark pairs
in proton-proton collisions induced by two-photon fusion including transverse
momenta of incoming photons. The unintegrated inelastic fluxes (related to
proton dissociation) of photons are calculated based on modern parametrizations
of deep inelastic structure functions in a broad range of $x$ and $Q^2$. We
focus on processes with single and double proton dissociation. Highly excited
remnant systems hadronise producing particles that can be vetoed in the
calorimeter. We calculate associated gap survival factors. The gap survival
factors depend on the process, mass of the remnant system and collision energy.
The rapidity gap survival factor due to remnant fragmentation for double
dissociative (DD) collisions is smaller than that for single dissociative (SD)
process. We observe approximate factorisation: $S_{R,DD} \approx S_{R,SD}^2$
when imposing rapidity veto. For the $W^+W^-$ final state, the remnant
fragmentation leads to a taming of the cross section when the rapidity gap
requirement is imposed. Also for $t \bar t$ quark-antiquark pairs such a
condition reverses the hierarchy observed for the case when such condition is
taken into account. Our results imply that for the production of such heavy
objects as $t$ quark and $\bar t$ antiquark the virtuality of the photons
attached to the dissociative system are very large ($Q^2 <$ 10$^{4}$ GeV$^2$).
A similar effect is observed for the $W^+ W^-$ system.
|
[
{
"created": "Thu, 2 Apr 2020 16:22:03 GMT",
"version": "v1"
}
] |
2020-08-26
|
[
[
"Łuszczak",
"Marta",
""
],
[
"Szczurek",
"Antoni",
""
]
] |
We discuss production of $W^+ W^-$ pairs and $t \bar t$ quark-antiquark pairs in proton-proton collisions induced by two-photon fusion including transverse momenta of incoming photons. The unintegrated inelastic fluxes (related to proton dissociation) of photons are calculated based on modern parametrizations of deep inelastic structure functions in a broad range of $x$ and $Q^2$. We focus on processes with single and double proton dissociation. Highly excited remnant systems hadronise producing particles that can be vetoed in the calorimeter. We calculate associated gap survival factors. The gap survival factors depend on the process, mass of the remnant system and collision energy. The rapidity gap survival factor due to remnant fragmentation for double dissociative (DD) collisions is smaller than that for single dissociative (SD) process. We observe approximate factorisation: $S_{R,DD} \approx S_{R,SD}^2$ when imposing rapidity veto. For the $W^+W^-$ final state, the remnant fragmentation leads to a taming of the cross section when the rapidity gap requirement is imposed. Also for $t \bar t$ quark-antiquark pairs such a condition reverses the hierarchy observed for the case when such condition is taken into account. Our results imply that for the production of such heavy objects as $t$ quark and $\bar t$ antiquark the virtuality of the photons attached to the dissociative system are very large ($Q^2 <$ 10$^{4}$ GeV$^2$). A similar effect is observed for the $W^+ W^-$ system.
|
2107.12934
|
Najimuddin Khan
|
Shreyashi Chakdar, Dilip Kumar Ghosh, P. Q. Hung, Najimuddin Khan,
Dibyendu Nanda
|
A model of light pseudoscalar dark matter
|
48 pages and 12 figures
| null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
The EW-$\nu_R$ model was constructed in order to provide a seesaw scenario
operating at the Electroweak scale $\Lambda_{EW} \sim 246$ GeV, keeping the
same SM gauge structure. In this model, right-handed neutrinos are non-sterile
and have masses of the order of $\Lambda_{EW}$. They can be searched for at the
LHC along with heavy mirror quarks and leptons, the lightest of which have
large decay lengths. The seesaw mechanism requires the existence of a complex
scalar which is singlet under the SM gauge group. The imaginary part of this
complex scalar denoted by $A^{0}_s$ is proposed to be the sub-MeV dark matter
candidate in this manuscript. We find that the sub-MeV scalar can serve as a
viable non-thermal feebly interacting massive particle (FIMP)-DM candidate.
This $A_s^0$ can be a naturally light sub-MeV DM candidate due to its nature as
a pseudo-Nambu-Goldstone (PNG) boson in the model. We show that the
well-studied freeze out mechanism falls short in this particular framework
producing DM overabundance. We identify that the freeze in mechanism produce
the correct order of relic density for the sub-MeV DM candidate satisfying all
applicable constraints. We then discuss the DM parameter space allowed by the
current bounds from the direct and indirect searches for this sub-MeV DM. This
model has a very rich scalar sector, consistent with various experimental
constraints, predicts a $\sim 125$ GeV scalar with the SM Higgs characteristics
satisfying the current LHC Higgs boson data.
|
[
{
"created": "Tue, 27 Jul 2021 16:43:22 GMT",
"version": "v1"
}
] |
2021-07-28
|
[
[
"Chakdar",
"Shreyashi",
""
],
[
"Ghosh",
"Dilip Kumar",
""
],
[
"Hung",
"P. Q.",
""
],
[
"Khan",
"Najimuddin",
""
],
[
"Nanda",
"Dibyendu",
""
]
] |
The EW-$\nu_R$ model was constructed in order to provide a seesaw scenario operating at the Electroweak scale $\Lambda_{EW} \sim 246$ GeV, keeping the same SM gauge structure. In this model, right-handed neutrinos are non-sterile and have masses of the order of $\Lambda_{EW}$. They can be searched for at the LHC along with heavy mirror quarks and leptons, the lightest of which have large decay lengths. The seesaw mechanism requires the existence of a complex scalar which is singlet under the SM gauge group. The imaginary part of this complex scalar denoted by $A^{0}_s$ is proposed to be the sub-MeV dark matter candidate in this manuscript. We find that the sub-MeV scalar can serve as a viable non-thermal feebly interacting massive particle (FIMP)-DM candidate. This $A_s^0$ can be a naturally light sub-MeV DM candidate due to its nature as a pseudo-Nambu-Goldstone (PNG) boson in the model. We show that the well-studied freeze out mechanism falls short in this particular framework producing DM overabundance. We identify that the freeze in mechanism produce the correct order of relic density for the sub-MeV DM candidate satisfying all applicable constraints. We then discuss the DM parameter space allowed by the current bounds from the direct and indirect searches for this sub-MeV DM. This model has a very rich scalar sector, consistent with various experimental constraints, predicts a $\sim 125$ GeV scalar with the SM Higgs characteristics satisfying the current LHC Higgs boson data.
|
2202.01504
|
Kazem Azizi
|
N. Er, K. Azizi
|
Spectroscopic parameters and electromagnetic form factor of kaon in
vacuum and a dense medium
|
10 Pages, 13 Figures and 3 Tables
| null |
10.1140/epjc/s10052-022-10333-w
| null |
hep-ph hep-ex hep-lat
|
http://creativecommons.org/licenses/by/4.0/
|
The spectroscopic parameters as well as electromagnetic form factor of the
strange particle kaon are investigated in vacuum and a medium with finite
density. The obtained vacuum mass and decay constant, which are consistent with
the existing experimental results, are used to extract the $ Q^2 $ dependence
of the kaon electromagnetic form factor in the interval $Q^2\in [0,10]$ GeV$^2$
in vacuum. The obtained results at lower and intermediate values of $ Q^2 $ are
consistent with the existing experimental data within the presented
uncertainties. The $ Q^2 $ behavior of the electromagnetic form factor of kaon
in vacuum and in the interval $Q^2\in [0,6]$ GeV$^2$ is in a nice agreement
with the existing predictions of the Lattice QCD and the solution of the
Bethe-Salpeter equation for the model of Nambu and Jona-Lasinio (NJL) with
proper-time regularization, as well. The obtained vacuum radius for kaon is
also in a nice agreement with the world's average experimental result. We
extend the analyses to a medium with higher densities and obtain the behavior
of the mass, decay constant, electromagnetic form factor and radius with
respect to density. The obtained results for some of the parameters are
compared with the existing predictions of other models and approaches. The
results obtained in the present study can be useful for future experimental and
theoretical studies both in vacuum and a dense medium.
|
[
{
"created": "Thu, 3 Feb 2022 10:27:05 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Apr 2022 19:28:43 GMT",
"version": "v2"
}
] |
2022-05-18
|
[
[
"Er",
"N.",
""
],
[
"Azizi",
"K.",
""
]
] |
The spectroscopic parameters as well as electromagnetic form factor of the strange particle kaon are investigated in vacuum and a medium with finite density. The obtained vacuum mass and decay constant, which are consistent with the existing experimental results, are used to extract the $ Q^2 $ dependence of the kaon electromagnetic form factor in the interval $Q^2\in [0,10]$ GeV$^2$ in vacuum. The obtained results at lower and intermediate values of $ Q^2 $ are consistent with the existing experimental data within the presented uncertainties. The $ Q^2 $ behavior of the electromagnetic form factor of kaon in vacuum and in the interval $Q^2\in [0,6]$ GeV$^2$ is in a nice agreement with the existing predictions of the Lattice QCD and the solution of the Bethe-Salpeter equation for the model of Nambu and Jona-Lasinio (NJL) with proper-time regularization, as well. The obtained vacuum radius for kaon is also in a nice agreement with the world's average experimental result. We extend the analyses to a medium with higher densities and obtain the behavior of the mass, decay constant, electromagnetic form factor and radius with respect to density. The obtained results for some of the parameters are compared with the existing predictions of other models and approaches. The results obtained in the present study can be useful for future experimental and theoretical studies both in vacuum and a dense medium.
|
hep-ph/9607373
|
Claudio Parrinello
|
D.S. Henty, C. Parrinello, D.G. Richards, J.I. Skullerud
|
Soft Pomeron Physics on the Lattice
|
8 pages, Latex, 2 PostScript figures and 2 style files included, to
appear in the Proceedings of DIS96
| null | null |
Univ. of Liverpool LTH-378, Univ of Edinburgh 96/15
|
hep-ph
| null |
We discuss strategies for using lattice QCD to investigate some topics in
strong interaction phenomenology which are usually related to soft pomeron
exchange. These include hadronic cross-sections at high energies and
diffractive scattering at HERA. Some numerical results are presented in the
framework of the Landshoff-Nachtmann pomeron model.
|
[
{
"created": "Fri, 19 Jul 1996 10:30:07 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Henty",
"D. S.",
""
],
[
"Parrinello",
"C.",
""
],
[
"Richards",
"D. G.",
""
],
[
"Skullerud",
"J. I.",
""
]
] |
We discuss strategies for using lattice QCD to investigate some topics in strong interaction phenomenology which are usually related to soft pomeron exchange. These include hadronic cross-sections at high energies and diffractive scattering at HERA. Some numerical results are presented in the framework of the Landshoff-Nachtmann pomeron model.
|
1401.6397
|
Ketan Patel
|
Anjan S. Joshipura, Ketan M. Patel
|
A massless neutrino and lepton mixing patterns from finite discrete
subgroups of U(3)
|
22 pages, minor changes, version accepted for publication in JHEP
|
JHEP 1404 (2014) 009
|
10.1007/JHEP04(2014)009
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Finite discrete subgroups of $U(3)$ as possible flavour symmetries $G_f$ for
a massless neutrinos with predictive mixing angles are studied. This is done by
assuming that a residual symmetry $S_\nu$ appropriate for describing a massless
neutrino is contained in $G_f$. It is shown that all the groups $G_f$ admitting
three dimensional faithful irreducible representation and generated from a
specific set of $3\times 3$ matrices imply only one of the three flavour
compositions for the massless state namely, unmixed, maximally mixed with equal
probabilities and bimaximally mixed with probabilities (0,1/2,1/2) and their
permutations. This result holds irrespective of the order of $G_f$ and the
choice of $S_{\nu}$ within it. All of these lead to unfavourable leading order
prediction for the solar mixing angle. Neutrino mixing pattern is then
numerically investigated in case of subgroups of $U(3)$ with order less than
512 and it is found that only one of these can lead to a massless neutrino and
leading order predictions for all the mixing angles close to their experimental
values. Ways to correct for the solar angle prediction are proposed and two
concrete examples giving the observed mixing pattern are discussed.
|
[
{
"created": "Fri, 24 Jan 2014 16:46:27 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Mar 2014 07:10:21 GMT",
"version": "v2"
}
] |
2014-04-07
|
[
[
"Joshipura",
"Anjan S.",
""
],
[
"Patel",
"Ketan M.",
""
]
] |
Finite discrete subgroups of $U(3)$ as possible flavour symmetries $G_f$ for a massless neutrinos with predictive mixing angles are studied. This is done by assuming that a residual symmetry $S_\nu$ appropriate for describing a massless neutrino is contained in $G_f$. It is shown that all the groups $G_f$ admitting three dimensional faithful irreducible representation and generated from a specific set of $3\times 3$ matrices imply only one of the three flavour compositions for the massless state namely, unmixed, maximally mixed with equal probabilities and bimaximally mixed with probabilities (0,1/2,1/2) and their permutations. This result holds irrespective of the order of $G_f$ and the choice of $S_{\nu}$ within it. All of these lead to unfavourable leading order prediction for the solar mixing angle. Neutrino mixing pattern is then numerically investigated in case of subgroups of $U(3)$ with order less than 512 and it is found that only one of these can lead to a massless neutrino and leading order predictions for all the mixing angles close to their experimental values. Ways to correct for the solar angle prediction are proposed and two concrete examples giving the observed mixing pattern are discussed.
|
1805.06726
|
Sergey Afonin
|
S. S. Afonin and T. D. Solomko
|
The large-Nc masses of light scalar mesons from QCD sum rules for linear
radial spectrum
|
6 pages, 2 figures, presented at Excited QCD 2018
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss a calculation of large-Nc masses of light scalar mesons from the
QCD sum rules. Two methods based on the use of linear radial Regge trajectories
are presented. We put a special emphasis on the appearance of pole near 0.5 GeV
in the scalar isoscalar channel which emerges in both methods and presumably
corresponds to the scalar sigma-meson.
|
[
{
"created": "Thu, 17 May 2018 12:36:13 GMT",
"version": "v1"
},
{
"created": "Tue, 29 May 2018 12:30:31 GMT",
"version": "v2"
}
] |
2018-05-30
|
[
[
"Afonin",
"S. S.",
""
],
[
"Solomko",
"T. D.",
""
]
] |
We discuss a calculation of large-Nc masses of light scalar mesons from the QCD sum rules. Two methods based on the use of linear radial Regge trajectories are presented. We put a special emphasis on the appearance of pole near 0.5 GeV in the scalar isoscalar channel which emerges in both methods and presumably corresponds to the scalar sigma-meson.
|
hep-ph/0408047
|
Andre Sopczak
|
Andre Sopczak (Lancaster University)
|
Searches for Higgs Bosons Beyond the Standard Model
|
6 pages, 10 figures. Contribution to the XII Workshop on Deep
Inelastic Scattering, DIS'2004, High Tatras, Slovakia, 14-18 April 2004
| null | null | null |
hep-ph
| null |
Latest results from the combined data of the four LEP experiments ALEPH,
DELPHI, L3 and OPAL on Higgs boson searches in extensions of the Standard Model
(SM) are presented.
|
[
{
"created": "Tue, 3 Aug 2004 19:33:14 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Sopczak",
"Andre",
"",
"Lancaster University"
]
] |
Latest results from the combined data of the four LEP experiments ALEPH, DELPHI, L3 and OPAL on Higgs boson searches in extensions of the Standard Model (SM) are presented.
|
2208.13719
|
Ingo Schienbein
|
Lohan Sartore, Markos Maniatis, Ingo Schienbein, Bjoern Herrmann
|
The general Two-Higgs Doublet Model in a gauge-invariant form
|
40 pages
| null |
10.1007/JHEP12(2022)051
|
LAPTH-045/22
|
hep-ph hep-th
|
http://creativecommons.org/licenses/by/4.0/
|
In the general Two-Higgs Doublet Model it has been shown that the Higgs
potential can be expressed in terms of gauge-independent quantities. In
particular, stability, electroweak symmetry breaking, and CP symmetry can be
understood in a concise way, avoiding unphysical gauge degrees of freedom. We
complete this program and show how all the masses, the trilinear and quartic
scalar interactions, the gauge-boson-Higgs interactions, as well as the Yukawa
couplings in the general THDM can be expressed in a gauge-invariant way.
|
[
{
"created": "Mon, 29 Aug 2022 16:59:33 GMT",
"version": "v1"
}
] |
2022-12-28
|
[
[
"Sartore",
"Lohan",
""
],
[
"Maniatis",
"Markos",
""
],
[
"Schienbein",
"Ingo",
""
],
[
"Herrmann",
"Bjoern",
""
]
] |
In the general Two-Higgs Doublet Model it has been shown that the Higgs potential can be expressed in terms of gauge-independent quantities. In particular, stability, electroweak symmetry breaking, and CP symmetry can be understood in a concise way, avoiding unphysical gauge degrees of freedom. We complete this program and show how all the masses, the trilinear and quartic scalar interactions, the gauge-boson-Higgs interactions, as well as the Yukawa couplings in the general THDM can be expressed in a gauge-invariant way.
|
2405.02254
|
Javad Shahrzad
|
Javad Shahrzad, Ali Khorramian
|
QCD analysis of valence structure functions using deep inelastic
lepton-nucleon scattering
|
26 pages, 15 figures, 4 tables
|
Phys. Rev. D 109, 114002 (2024)
|
10.1103/PhysRevD.109.114002
| null |
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
A new ''$\mathtt{SK24}$'' non-singlet QCD analysis of the structure functions
at the NNLO approximation is performed, utilizing the global fit of the data
from various charged lepton scattering experiments. We extract the valence
parton distribution functions (PDFs) and provide a parametrization of them,
along with the correlated errors for a wide range of $x$ and $Q^2$. We compare
valence PDFs and their uncertainties with those from different PDF sets
provided by various groups. We also obtain valence PDFs and the strong coupling
constant $\alpha_{s}(M_Z^2)$, taking into account the nuclear correction
concerning large $x$ as well as the target mass correction (TMC) and higher
twist (HT) effects at the NNLO. In the large $x$ region, we extract the higher
twist contributions of $xF_3(x,Q^2)$, $F_2^p (x,Q^2)$, and $F_2^d(x,Q^2)$. We
determine $\alpha_{s}(M_Z^2)$ without and with considering the TMC and HT
corrections and perform a comparison with the world average of
$\alpha_{s}(M_Z^2)$ and other reported results. The extracted results
concerning valence PDFs with their uncertainties and $\alpha_{s}(M_Z^2)$ value
agree with available theoretical models.
|
[
{
"created": "Fri, 3 May 2024 17:12:59 GMT",
"version": "v1"
}
] |
2024-06-07
|
[
[
"Shahrzad",
"Javad",
""
],
[
"Khorramian",
"Ali",
""
]
] |
A new ''$\mathtt{SK24}$'' non-singlet QCD analysis of the structure functions at the NNLO approximation is performed, utilizing the global fit of the data from various charged lepton scattering experiments. We extract the valence parton distribution functions (PDFs) and provide a parametrization of them, along with the correlated errors for a wide range of $x$ and $Q^2$. We compare valence PDFs and their uncertainties with those from different PDF sets provided by various groups. We also obtain valence PDFs and the strong coupling constant $\alpha_{s}(M_Z^2)$, taking into account the nuclear correction concerning large $x$ as well as the target mass correction (TMC) and higher twist (HT) effects at the NNLO. In the large $x$ region, we extract the higher twist contributions of $xF_3(x,Q^2)$, $F_2^p (x,Q^2)$, and $F_2^d(x,Q^2)$. We determine $\alpha_{s}(M_Z^2)$ without and with considering the TMC and HT corrections and perform a comparison with the world average of $\alpha_{s}(M_Z^2)$ and other reported results. The extracted results concerning valence PDFs with their uncertainties and $\alpha_{s}(M_Z^2)$ value agree with available theoretical models.
|
1004.1880
|
Song He
|
Song He, Mei Huang, Qi-Shu Yan
|
Logarithmic correction in the deformed ${\rm AdS}_5$ model to produce
the heavy quark potential and QCD beta function
|
24 pages, 16 figures
|
Phys.Rev.D83:045034,2011
|
10.1103/PhysRevD.83.045034
| null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We stude the \textit{holographic} QCD model which contains a quadratic term $
-\sigma z^2$ and a logarithmic term $-c_0\log[(z_{IR}-z)/z_{IR}]$ with an
explicit infrared cut-off $z_{IR}$ in the deformed ${\rm AdS}_5$ warp factor.
We investigate the heavy quark potential for three cases, i.e, with only
quadratic correction, with both quadratic and logarithmic corrections and with
only logarithmic correction. We solve the dilaton field and dilation potential
from the Einstein equation, and investigate the corresponding beta function in
the G{\"u}rsoy -Kiritsis-Nitti (GKN) framework. Our studies show that in the
case with only quadratic correction, a negative $\sigma$ or the
Andreev-Zakharov model is favored to fit the heavy quark potential and to
produce the QCD beta-function at 2-loop level, however, the dilaton potential
is unbounded in infrared regime. One interesting observing for the case of
positive $\sigma$, or the soft-wall ${\rm AdS}_5$ model is that the
corresponding beta-function exists an infrared fixed point. In the case with
only logarithmic correction, the heavy quark Cornell potential can be fitted
very well, the corresponding beta-function agrees with the QCD beta-function at
2-loop level reasonably well, and the dilaton potential is bounded from below
in infrared. At the end, we propose a more compact model which has only
logarithmic correction in the deformed warp factor and has less free
parameters.
|
[
{
"created": "Mon, 12 Apr 2010 07:08:27 GMT",
"version": "v1"
}
] |
2011-03-23
|
[
[
"He",
"Song",
""
],
[
"Huang",
"Mei",
""
],
[
"Yan",
"Qi-Shu",
""
]
] |
We stude the \textit{holographic} QCD model which contains a quadratic term $ -\sigma z^2$ and a logarithmic term $-c_0\log[(z_{IR}-z)/z_{IR}]$ with an explicit infrared cut-off $z_{IR}$ in the deformed ${\rm AdS}_5$ warp factor. We investigate the heavy quark potential for three cases, i.e, with only quadratic correction, with both quadratic and logarithmic corrections and with only logarithmic correction. We solve the dilaton field and dilation potential from the Einstein equation, and investigate the corresponding beta function in the G{\"u}rsoy -Kiritsis-Nitti (GKN) framework. Our studies show that in the case with only quadratic correction, a negative $\sigma$ or the Andreev-Zakharov model is favored to fit the heavy quark potential and to produce the QCD beta-function at 2-loop level, however, the dilaton potential is unbounded in infrared regime. One interesting observing for the case of positive $\sigma$, or the soft-wall ${\rm AdS}_5$ model is that the corresponding beta-function exists an infrared fixed point. In the case with only logarithmic correction, the heavy quark Cornell potential can be fitted very well, the corresponding beta-function agrees with the QCD beta-function at 2-loop level reasonably well, and the dilaton potential is bounded from below in infrared. At the end, we propose a more compact model which has only logarithmic correction in the deformed warp factor and has less free parameters.
|
hep-ph/9807363
|
Photis Moulatsiotis
|
Mark Hindmarsh and Photis Moulatsiotis (Sussex)
|
Constraints on Axion Models from $K^+\to\pi^+ a$
|
15pp RevTeX, 1 eps fig, uses graphics style. Expanded discussion on
massive scalars and pseudoscalars, typos. To appear in Physical Review D
|
Phys. Rev. D 59, 055015 (1999)
|
10.1103/PhysRevD.59.055015
|
SUSX-TH-98-017
|
hep-ph
| null |
We explore a new class of axion models in which some, but not all, of the
left-handed quarks have a Peccei-Quinn symmetry. These models are potentially
afflicted by flavour changing neutral currents. We derive the bounds on the
Peccei-Quinn symmetry-breaking scale from bounds on the $K^+\to \pi^+ a$
branching ratio, showing that in some cases they are even stronger than the
astrophysical ones, but still not strong enough to kill off the models.
|
[
{
"created": "Mon, 13 Jul 1998 18:48:12 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Dec 1998 11:13:51 GMT",
"version": "v2"
}
] |
2016-08-25
|
[
[
"Hindmarsh",
"Mark",
"",
"Sussex"
],
[
"Moulatsiotis",
"Photis",
"",
"Sussex"
]
] |
We explore a new class of axion models in which some, but not all, of the left-handed quarks have a Peccei-Quinn symmetry. These models are potentially afflicted by flavour changing neutral currents. We derive the bounds on the Peccei-Quinn symmetry-breaking scale from bounds on the $K^+\to \pi^+ a$ branching ratio, showing that in some cases they are even stronger than the astrophysical ones, but still not strong enough to kill off the models.
|
hep-ph/0312354
|
Leonid Glozman
|
L. Ya. Glozman
|
Chiral multiplets of excited mesons
|
14 pages, discussion and conclusion section is largely extended
|
Phys.Lett.B587:69-77,2004
|
10.1016/j.physletb.2004.02.066
| null |
hep-ph hep-ex hep-lat nucl-th
| null |
It is shown that experimental meson states with spins J=0,1,2,3 in the energy
range 1.9 - 2.4 GeV obtained in recent partial wave analysis of
proton-antiproton annihilation at LEAR remarkably confirm all predictions of
chiral symmetry restoration. Classification of excited $\bar q q$ mesons
according to the representations of chiral $U(2)_L \times U(2)_R$ group is
performed. There are two important predictions of chiral symmetry restoration
in highly excited mesons: (i) physical states must fill out approximately
degenerate parity-chiral multiplets; (ii) some of the physical states with the
given $I,J^{PC}$ are members of one parity-chiral multiplet, while the other
states with the same $I,J^{PC}$ are members of the other parity-chiral
multiplet. For example, while some of the excited $\rho(1,1^{--})$ states are
systematically degenerate with $a_1(1,1^{++})$ states forming (0,1)+(1,0)
chiral multiplets, the other excited $\rho(1,1^{--})$ states are degenerate
with $h_1(0,1^{+-})$ states ((1/2,1/2) chiral multiplets). Hence, one of the
predictions of chiral symmetry restoration is that the combined amount of
$a_1(1,1^{++})$ and $h_1(0,1^{+-})$ states must coincide with the amount of
$\rho(1,1^{--})$ states in the chirally restored regime. It is shown that the
same rule applies (and experimentally confirmed) to many other meson states.
|
[
{
"created": "Mon, 29 Dec 2003 14:06:57 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Feb 2004 11:37:39 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Glozman",
"L. Ya.",
""
]
] |
It is shown that experimental meson states with spins J=0,1,2,3 in the energy range 1.9 - 2.4 GeV obtained in recent partial wave analysis of proton-antiproton annihilation at LEAR remarkably confirm all predictions of chiral symmetry restoration. Classification of excited $\bar q q$ mesons according to the representations of chiral $U(2)_L \times U(2)_R$ group is performed. There are two important predictions of chiral symmetry restoration in highly excited mesons: (i) physical states must fill out approximately degenerate parity-chiral multiplets; (ii) some of the physical states with the given $I,J^{PC}$ are members of one parity-chiral multiplet, while the other states with the same $I,J^{PC}$ are members of the other parity-chiral multiplet. For example, while some of the excited $\rho(1,1^{--})$ states are systematically degenerate with $a_1(1,1^{++})$ states forming (0,1)+(1,0) chiral multiplets, the other excited $\rho(1,1^{--})$ states are degenerate with $h_1(0,1^{+-})$ states ((1/2,1/2) chiral multiplets). Hence, one of the predictions of chiral symmetry restoration is that the combined amount of $a_1(1,1^{++})$ and $h_1(0,1^{+-})$ states must coincide with the amount of $\rho(1,1^{--})$ states in the chirally restored regime. It is shown that the same rule applies (and experimentally confirmed) to many other meson states.
|
2001.05884
|
Feng-Kun Guo
|
Feng-Kun Guo
|
Triangle Singularities and Charmonium-like $XYZ$ States
|
15 pages, 5 figures; conference proceedings for the 17th Chinese
Nuclear Physics Conference; published version
|
Nucl. Phys. Rev. 37 (2020) 406-413
|
10.11804/NuclPhysRev.37.2019CNPC52
| null |
hep-ph hep-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The spectrum of hadrons is important for understanding the confinement of
quantum chromodynamics. Many new puzzles arose since 2003 due to the abundance
of experimental discoveries with the $XYZ$ structures in the heavy quarkonium
mass region being the outstanding examples. Hadronic resonances correspond to
poles of the $S$-matrix, which has other types of singularities such as the
triangle singularity due to the simultaneous on-shellness of three intermediate
particles. Here we briefly discuss a few possible manifestations of triangle
singularities in the $XYZ$ physics, paying particular attention to the
formalism that can be used to analyze the data for charged $Z_c$ structures in
the $\psi\pi$ distributions of the reaction $e^+e^-\to \psi\pi^+\pi^-$.
|
[
{
"created": "Thu, 16 Jan 2020 15:19:27 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Mar 2021 01:12:29 GMT",
"version": "v2"
}
] |
2021-03-02
|
[
[
"Guo",
"Feng-Kun",
""
]
] |
The spectrum of hadrons is important for understanding the confinement of quantum chromodynamics. Many new puzzles arose since 2003 due to the abundance of experimental discoveries with the $XYZ$ structures in the heavy quarkonium mass region being the outstanding examples. Hadronic resonances correspond to poles of the $S$-matrix, which has other types of singularities such as the triangle singularity due to the simultaneous on-shellness of three intermediate particles. Here we briefly discuss a few possible manifestations of triangle singularities in the $XYZ$ physics, paying particular attention to the formalism that can be used to analyze the data for charged $Z_c$ structures in the $\psi\pi$ distributions of the reaction $e^+e^-\to \psi\pi^+\pi^-$.
|
1703.00912
|
Matthew Low
|
Marco Farina, Matthew Low
|
Constraining Quirky Tracks with Conventional Searches
|
7 pages, 3 figures, 2 tables
|
Phys. Rev. Lett. 119, 111801 (2017)
|
10.1103/PhysRevLett.119.111801
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Quirks are particles that are both charged under the standard model and under
a new confining group. The quirk setup assumes there are no light flavors of
the new confining group so that while the theory is in a confining phase, the
distance between quirk-antiquirk pairs can be macroscopic. In this work, we
reinterpret existing collider limits, those from monojet and heavy stable
charged particle searches, as limits on quirks. Additionally, we propose a new
search in the magnetic-field-less CMS data for quirks and estimate the
sensitivity. We focus on the region where the confinement scale is roughly
between 1 eV and 100 eV and find mass constraints in the TeV-range, depending
on the quirk's quantum numbers.
|
[
{
"created": "Thu, 2 Mar 2017 19:00:04 GMT",
"version": "v1"
}
] |
2017-09-20
|
[
[
"Farina",
"Marco",
""
],
[
"Low",
"Matthew",
""
]
] |
Quirks are particles that are both charged under the standard model and under a new confining group. The quirk setup assumes there are no light flavors of the new confining group so that while the theory is in a confining phase, the distance between quirk-antiquirk pairs can be macroscopic. In this work, we reinterpret existing collider limits, those from monojet and heavy stable charged particle searches, as limits on quirks. Additionally, we propose a new search in the magnetic-field-less CMS data for quirks and estimate the sensitivity. We focus on the region where the confinement scale is roughly between 1 eV and 100 eV and find mass constraints in the TeV-range, depending on the quirk's quantum numbers.
|
hep-ph/9803277
|
Georg Weiglein
|
S. Heinemeyer, W. Hollik and G. Weiglein
|
QCD Corrections to the Masses of the neutral CP-even Higgs Bosons in the
MSSM
|
9 pages, 4 figures, more detailed discussion about comparison with
other approaches, minor further changes, version to appear in Phys. Rev. D
Rapid Comm
|
Phys.Rev.D58:091701,1998
|
10.1103/PhysRevD.58.091701
|
KA-TP-2-1998
|
hep-ph
| null |
We perform a diagrammatic calculation of the leading two-loop QCD corrections
to the masses of the neutral CP-even Higgs bosons in the Minimal Supersymmetric
Standard Model (MSSM). The results are valid for arbitrary values of the
parameters of the Higgs and scalar top sector of the MSSM. The two-loop
corrections are found to reduce the mass of the lightest Higgs boson
considerably compared to its one-loop value. The numerical results are analyzed
in the GUT favored regions of small and large \tan \beta. Their impact on a
precise prediction for the mass of the lightest Higgs boson is briefly
discussed.
|
[
{
"created": "Sun, 8 Mar 1998 14:29:48 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Aug 1998 16:18:07 GMT",
"version": "v2"
}
] |
2009-12-30
|
[
[
"Heinemeyer",
"S.",
""
],
[
"Hollik",
"W.",
""
],
[
"Weiglein",
"G.",
""
]
] |
We perform a diagrammatic calculation of the leading two-loop QCD corrections to the masses of the neutral CP-even Higgs bosons in the Minimal Supersymmetric Standard Model (MSSM). The results are valid for arbitrary values of the parameters of the Higgs and scalar top sector of the MSSM. The two-loop corrections are found to reduce the mass of the lightest Higgs boson considerably compared to its one-loop value. The numerical results are analyzed in the GUT favored regions of small and large \tan \beta. Their impact on a precise prediction for the mass of the lightest Higgs boson is briefly discussed.
|
1202.2632
|
Azad Inshalla oglu Ahmadov
|
A. I. Ahmadov, C. Aydin, F. Keskin
|
Pion wave functions from holographic QCD and the role of infrared
renormalons in photon-photon collisions
|
21 pages, 15 figures. arXiv admin note: text overlap with
arXiv:0709.2072 by other authors
|
Phys. Rev. D85, 034009, 2012
|
10.1103/PhysRevD.85.034009
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this article, we calculate the contribution of the higher-twist Feynman
diagrams to the large-$p_T$ inclusive single pion production cross section in
photon-photon collisions in case of the running coupling and frozen coupling
approaches within holographic QCD. We compare the resummed higher-twist cross
sections with the ones obtained in the framework of the frozen coupling
approach and leading-twist cross section. Also, we show that in the context of
frozen coupling approach a higher-twist contribution to the photon-photon
collisions cross section is normalized in terms of the pion electromagnetic
form factor.
|
[
{
"created": "Mon, 13 Feb 2012 05:49:30 GMT",
"version": "v1"
}
] |
2015-06-04
|
[
[
"Ahmadov",
"A. I.",
""
],
[
"Aydin",
"C.",
""
],
[
"Keskin",
"F.",
""
]
] |
In this article, we calculate the contribution of the higher-twist Feynman diagrams to the large-$p_T$ inclusive single pion production cross section in photon-photon collisions in case of the running coupling and frozen coupling approaches within holographic QCD. We compare the resummed higher-twist cross sections with the ones obtained in the framework of the frozen coupling approach and leading-twist cross section. Also, we show that in the context of frozen coupling approach a higher-twist contribution to the photon-photon collisions cross section is normalized in terms of the pion electromagnetic form factor.
|
hep-ph/0208240
|
Roy Sourov
|
Debajyoti Choudhury (HRI, India), Dilip Kumar Ghosh (NCTS, Taiwan),
Sourov Roy (Technion, Israel)
|
Signals of anomaly mediated supersymmetry breaking in an e^- gamma
collider
|
25 pages, LaTex, 7 PS figures and 1 table (included)
|
Nucl.Phys. B646 (2002) 3-23
|
10.1016/S0550-3213(02)00902-1
|
MRI-P-020802
|
hep-ph
| null |
We study the signatures of minimal anomaly mediated supersymmetry breaking in
an e^- gamma collider. We demonstrate that the associated production of a
sneutrino with the lightest chargino leads to a substantially large signal
size. The background is negligibly small, though. Even more interestingly, a
measurement of the fundamental supersymmetry breaking parameters could be
possible.
|
[
{
"created": "Mon, 26 Aug 2002 18:09:19 GMT",
"version": "v1"
}
] |
2010-04-05
|
[
[
"Choudhury",
"Debajyoti",
"",
"HRI, India"
],
[
"Ghosh",
"Dilip Kumar",
"",
"NCTS, Taiwan"
],
[
"Roy",
"Sourov",
"",
"Technion, Israel"
]
] |
We study the signatures of minimal anomaly mediated supersymmetry breaking in an e^- gamma collider. We demonstrate that the associated production of a sneutrino with the lightest chargino leads to a substantially large signal size. The background is negligibly small, though. Even more interestingly, a measurement of the fundamental supersymmetry breaking parameters could be possible.
|
hep-ph/0304144
|
Wolfgang Ochs
|
Peter Minkowski (Uni Bern) and Wolfgang Ochs (MPI Munich)
|
Scalar mesons and glueball in B-decays and gluon jets
|
13 pages
| null | null |
BUTP-03/10, MPI-PhT/2003-16
|
hep-ph
| null |
We discuss the recent observation of f_0(980) in charmless B-decays and in
gluon jets which hints toward a gluonic coupling of this meson similar to eta'.
Further predictions on B-decays into scalar particles are presented. Charmless
B decays also show a broad K Kbar (and possibly pi pi) S-wave enhancement which
we relate to the 0^{++} glueball. These gluonic mesons represent a sizable
fraction of the theoretically derived decay rate for b -> sg.
|
[
{
"created": "Tue, 15 Apr 2003 17:32:08 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Minkowski",
"Peter",
"",
"Uni Bern"
],
[
"Ochs",
"Wolfgang",
"",
"MPI Munich"
]
] |
We discuss the recent observation of f_0(980) in charmless B-decays and in gluon jets which hints toward a gluonic coupling of this meson similar to eta'. Further predictions on B-decays into scalar particles are presented. Charmless B decays also show a broad K Kbar (and possibly pi pi) S-wave enhancement which we relate to the 0^{++} glueball. These gluonic mesons represent a sizable fraction of the theoretically derived decay rate for b -> sg.
|
hep-ph/9411255
|
Alessandro Strumia
|
R. Barbieri, P. Ciafaloni and A. Strumia
|
Light thresholds in Grand Unified Theories
|
8 pages; all figures are now included in a uuencoded file
|
Nucl.Phys.B442:461-471,1995
|
10.1016/0550-3213(95)00127-E
|
IFUP -- TH 47/94
|
hep-ph
| null |
In a generic Grand Unified Theory with a relatively small dispersion of the
spectrum around the $Z$-boson and the unification masses, a connection is
established, exact at one loop level, between $M_Z$, $G_{\rm F}$, $\alpha(M_Z)$
and the strong coupling constant $\alpha_3(M_Z)$. At this level of precision,
this avoids the logical and phenomenological inconsistency of predicting
$\alpha_3(M_Z)$ by means of the electroweak couplings as extracted from the
data in the Standard Model rather than in the complete theory. Attention is
paid to the independence of the physical results from regularization and/or
renormalization schemes. As a particularly relevant example, the analysis is
specialized to the case of the Minimal Supersymmetric Standard Model, with
emphasis on light charginos and neutralinos.
|
[
{
"created": "Wed, 9 Nov 1994 16:43:11 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Aug 1995 10:59:33 GMT",
"version": "v2"
}
] |
2009-10-09
|
[
[
"Barbieri",
"R.",
""
],
[
"Ciafaloni",
"P.",
""
],
[
"Strumia",
"A.",
""
]
] |
In a generic Grand Unified Theory with a relatively small dispersion of the spectrum around the $Z$-boson and the unification masses, a connection is established, exact at one loop level, between $M_Z$, $G_{\rm F}$, $\alpha(M_Z)$ and the strong coupling constant $\alpha_3(M_Z)$. At this level of precision, this avoids the logical and phenomenological inconsistency of predicting $\alpha_3(M_Z)$ by means of the electroweak couplings as extracted from the data in the Standard Model rather than in the complete theory. Attention is paid to the independence of the physical results from regularization and/or renormalization schemes. As a particularly relevant example, the analysis is specialized to the case of the Minimal Supersymmetric Standard Model, with emphasis on light charginos and neutralinos.
|
1412.1247
|
Marc Knecht
|
V\'eronique Bernard, S\'ebastien Descotes-Genon, Marc Knecht
|
Isospin breaking in pion and $K_{e4}$ form factors
|
15 pages, 3 figures, prepared for the proceedings of the XIth
Confinement and Hadron Spectrum Conference, Saint-Petersburg, Sept. 8-12,
2014
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Isospin breaking in the $K_{\ell 4}$ form factors induced by the difference
between charged and neutral pion masses is discussed within a framework built
on suitably subtracted dispersion representations. The $K_{\ell 4}$ form
factors are constructed in an iterative way up to two loops in the low-energy
expansion by implementing analyticity, crossing, and unitarity due to two-meson
intermediate states. Analytical expressions for the phases of the two-loop form
factors of the $K^\pm\to\pi^+\pi^- e^\pm \nu_e$ channel are presented, allowing
one to connect the difference of form-factor phase shifts measured
experimentally (out of the isospin limit) and the difference of $S$- and
$P$-wave $\pi\pi$ phase shifts studied theoretically (in the isospin limit).
The dependence with respect to the two $S$-wave scattering lengths $a_0^0$ and
$a_0^2$ in the isospin limit is worked out in a general way, in contrast to
previous analyses based on one-loop chiral perturbation theory. The results on
the phases of the $K^\pm\to\pi^+\pi^- e^\pm \nu_e$ form factors obtained by the
NA48/2 collaboration at the CERN SPS are reanalysed including isospin-breaking
correction to extract values for the scattering lengths $a_0^0$ and $a_0^2$.
|
[
{
"created": "Wed, 3 Dec 2014 09:35:54 GMT",
"version": "v1"
}
] |
2014-12-04
|
[
[
"Bernard",
"Véronique",
""
],
[
"Descotes-Genon",
"Sébastien",
""
],
[
"Knecht",
"Marc",
""
]
] |
Isospin breaking in the $K_{\ell 4}$ form factors induced by the difference between charged and neutral pion masses is discussed within a framework built on suitably subtracted dispersion representations. The $K_{\ell 4}$ form factors are constructed in an iterative way up to two loops in the low-energy expansion by implementing analyticity, crossing, and unitarity due to two-meson intermediate states. Analytical expressions for the phases of the two-loop form factors of the $K^\pm\to\pi^+\pi^- e^\pm \nu_e$ channel are presented, allowing one to connect the difference of form-factor phase shifts measured experimentally (out of the isospin limit) and the difference of $S$- and $P$-wave $\pi\pi$ phase shifts studied theoretically (in the isospin limit). The dependence with respect to the two $S$-wave scattering lengths $a_0^0$ and $a_0^2$ in the isospin limit is worked out in a general way, in contrast to previous analyses based on one-loop chiral perturbation theory. The results on the phases of the $K^\pm\to\pi^+\pi^- e^\pm \nu_e$ form factors obtained by the NA48/2 collaboration at the CERN SPS are reanalysed including isospin-breaking correction to extract values for the scattering lengths $a_0^0$ and $a_0^2$.
|
1208.5636
|
Aurore Courtoy
|
A. Courtoy, Simonetta Liuti
|
The Strong Coupling Constant from Hadron Structure Phenomenology
|
To appear in the proceedings of the QCD Evolution Workshop, JLab, May
14-17, 2012. Includes ws-ijmpcs.cls
| null |
10.1142/S2010194512009312
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present recent developments on the role of the running coupling constant
at the intersection of perturbative and nonperturbative QCD. A number of
experiments show a smooth transition from small to large scales given by the
four-momentum transfer in the reactions. This is at variance with perturbative
QCD where the running coupling constant becomes infinite when the scale equals
$\Lambda_{{\tiny QCD}}$. Approaches using an effective coupling constant could
help interpret the opposite trend of data as compared to standard perturbative
QCD predictions. We give an overview of the role of the coupling constant in
the procedure to match nonperturbative hadronic model to perturbative QCD and
we propose an extraction of an effective coupling constant from inclusive
electron proton scattering data at large Bjorken x.
|
[
{
"created": "Tue, 28 Aug 2012 12:12:45 GMT",
"version": "v1"
}
] |
2015-06-11
|
[
[
"Courtoy",
"A.",
""
],
[
"Liuti",
"Simonetta",
""
]
] |
We present recent developments on the role of the running coupling constant at the intersection of perturbative and nonperturbative QCD. A number of experiments show a smooth transition from small to large scales given by the four-momentum transfer in the reactions. This is at variance with perturbative QCD where the running coupling constant becomes infinite when the scale equals $\Lambda_{{\tiny QCD}}$. Approaches using an effective coupling constant could help interpret the opposite trend of data as compared to standard perturbative QCD predictions. We give an overview of the role of the coupling constant in the procedure to match nonperturbative hadronic model to perturbative QCD and we propose an extraction of an effective coupling constant from inclusive electron proton scattering data at large Bjorken x.
|
hep-ph/9410347
|
Chao-Qiang GengT
|
C.Q. Geng and S.K. Lee
|
Analysis of Transverse Muon Polarization in $K^+\to \pi^0\mu^+\nu$ and
$K^+\to \mu^+\nu\gamma$ Decays with Tensor Interactions
|
13 pages (LaTex), 3 figures (not included), NHCU-HEP-94-03
|
Phys.Rev. D51 (1995) 99-102
|
10.1103/PhysRevD.51.99
| null |
hep-ph
| null |
The T violating transverse muon polarizations in $K^+\to \pi^0\mu^+\nu$ and
$K^+\to \mu^+\nu\gamma$ decays due to tensor interactions are studied. The
magnitudes of these polarizations over the allowed phase space are presented.
|
[
{
"created": "Sat, 22 Oct 1994 13:35:21 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Geng",
"C. Q.",
""
],
[
"Lee",
"S. K.",
""
]
] |
The T violating transverse muon polarizations in $K^+\to \pi^0\mu^+\nu$ and $K^+\to \mu^+\nu\gamma$ decays due to tensor interactions are studied. The magnitudes of these polarizations over the allowed phase space are presented.
|
2103.12099
|
Andrea Caputo
|
Jos\'e Luis Bernal, Andrea Caputo, Francisco Villaescusa-Navarro, Marc
Kamionkowski
|
Detecting the radiative decay of the cosmic neutrino background with
line-intensity mapping
|
Version published in PRL
|
Phys. Rev. Lett. 127, 131102 (2021)
|
10.1103/PhysRevLett.127.131102
| null |
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the possibility to use line-intensity mapping (LIM) to seek photons
from the radiative decay of neutrinos in the cosmic neutrino background. The
Standard Model prediction for the rate for these decays is extremely small, but
it can be enhanced if new physics increases the neutrino electromagnetic
moments. The decay photons will appear as an interloper of astrophysical
spectral lines. We propose that the neutrino-decay line can be identified with
anisotropies in LIM clustering and also with the voxel intensity distribution.
Ongoing and future LIM experiments will have -- depending on the neutrino
hierarchy, transition and experiment considered -- a sensitivity to an
effective electromagnetic transition moment $\sim 10^{-12}\, -\,10^{-8}\,
(m_ic^2/{0.1 \rm eV})^{3/2}\mu_{\rm B}$, where $m_i$ is the mass of the
decaying neutrino and $\mu_{\rm B}$ is the Bohr magneton. This will be
significantly more sensitive than cosmic microwave background spectral
distortions, and it will be competitive with stellar cooling studies. As a
byproduct, we also report an analytic form of the one-point probability
distribution function for neutrino-density fluctuations, obtained from the
Quijote simulations using symbolic regression.
|
[
{
"created": "Mon, 22 Mar 2021 18:01:41 GMT",
"version": "v1"
},
{
"created": "Fri, 22 Oct 2021 14:43:50 GMT",
"version": "v2"
}
] |
2021-10-25
|
[
[
"Bernal",
"José Luis",
""
],
[
"Caputo",
"Andrea",
""
],
[
"Villaescusa-Navarro",
"Francisco",
""
],
[
"Kamionkowski",
"Marc",
""
]
] |
We study the possibility to use line-intensity mapping (LIM) to seek photons from the radiative decay of neutrinos in the cosmic neutrino background. The Standard Model prediction for the rate for these decays is extremely small, but it can be enhanced if new physics increases the neutrino electromagnetic moments. The decay photons will appear as an interloper of astrophysical spectral lines. We propose that the neutrino-decay line can be identified with anisotropies in LIM clustering and also with the voxel intensity distribution. Ongoing and future LIM experiments will have -- depending on the neutrino hierarchy, transition and experiment considered -- a sensitivity to an effective electromagnetic transition moment $\sim 10^{-12}\, -\,10^{-8}\, (m_ic^2/{0.1 \rm eV})^{3/2}\mu_{\rm B}$, where $m_i$ is the mass of the decaying neutrino and $\mu_{\rm B}$ is the Bohr magneton. This will be significantly more sensitive than cosmic microwave background spectral distortions, and it will be competitive with stellar cooling studies. As a byproduct, we also report an analytic form of the one-point probability distribution function for neutrino-density fluctuations, obtained from the Quijote simulations using symbolic regression.
|
hep-ph/9606247
|
Isi Dunietz
|
Isard Dunietz (Fermilab)
|
On the Necessity of Recalibrating Heavy Flavor Decays and its Impact on
Apparent Puzzles in High Energy Physics
|
60 pages, RevTex
| null | null |
FERMILAB--PUB--96/104--T
|
hep-ph
| null |
It is demonstrated that charm is systematically undercounted in various
experiments. Via a process of elimination, $B(D^0 \rightarrow K^- \pi^+ )$ is
identified as the culprit. It calibrates essentially all charmed meson
production and decay properties, and thus is central to the physics of heavy
flavors. We predict it to decrease significantly below currently accepted
values. We suggest several novel methods for precise measurements of $B(D^0
\rightarrow K^- \pi^+ )$. The $B(\Lambda_c \rightarrow pK^-\pi^+)$, on the
other hand, calibrates heavy-flavored baryons. Its world average relies heavily
on a model of baryon production in $B$ decays, which would be invalidated if
$\overline B\rightarrow D^{(*)} \stackrel{(-)}{N} X$ processes were found to be
significant. A Dalitz-plot analysis explains naturally the soft inclusive
$\Lambda_c$ momentum spectrum in $\overline B$ decays, and predicts sizable
$\overline B\rightarrow D^{(*)}\stackrel{(-)}{N} X$ processes. Consistently
carrying through these modifications to charmed meson and baryon yields has the
potential to resolve the heavy-flavor puzzles at $Z^0$-factories [$R_c,\;
R_b$], the number of charm per $B$-decay puzzle, and the semi-leptonic $B$
decay puzzles. We emphasize that state of the art theoretical calculations are
consistent with precise experimental measurements regarding $B(\overline
B\rightarrow X\ell\bar\nu )$. Recent CLEO measurements are interpreted as newly
available cross-checks that any inclusive theoretical investigation must
satisfy. Another topic of this report concerns the $b\rightarrow c + \overline
D^{(*)}\overline K$ transitions, which were predicted to be sizable and
subsequently confirmed by CLEO. This report discusses the underlying dynamics
of those processes and quantifies the necessary modifications in existing
|
[
{
"created": "Wed, 5 Jun 1996 20:45:05 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Dunietz",
"Isard",
"",
"Fermilab"
]
] |
It is demonstrated that charm is systematically undercounted in various experiments. Via a process of elimination, $B(D^0 \rightarrow K^- \pi^+ )$ is identified as the culprit. It calibrates essentially all charmed meson production and decay properties, and thus is central to the physics of heavy flavors. We predict it to decrease significantly below currently accepted values. We suggest several novel methods for precise measurements of $B(D^0 \rightarrow K^- \pi^+ )$. The $B(\Lambda_c \rightarrow pK^-\pi^+)$, on the other hand, calibrates heavy-flavored baryons. Its world average relies heavily on a model of baryon production in $B$ decays, which would be invalidated if $\overline B\rightarrow D^{(*)} \stackrel{(-)}{N} X$ processes were found to be significant. A Dalitz-plot analysis explains naturally the soft inclusive $\Lambda_c$ momentum spectrum in $\overline B$ decays, and predicts sizable $\overline B\rightarrow D^{(*)}\stackrel{(-)}{N} X$ processes. Consistently carrying through these modifications to charmed meson and baryon yields has the potential to resolve the heavy-flavor puzzles at $Z^0$-factories [$R_c,\; R_b$], the number of charm per $B$-decay puzzle, and the semi-leptonic $B$ decay puzzles. We emphasize that state of the art theoretical calculations are consistent with precise experimental measurements regarding $B(\overline B\rightarrow X\ell\bar\nu )$. Recent CLEO measurements are interpreted as newly available cross-checks that any inclusive theoretical investigation must satisfy. Another topic of this report concerns the $b\rightarrow c + \overline D^{(*)}\overline K$ transitions, which were predicted to be sizable and subsequently confirmed by CLEO. This report discusses the underlying dynamics of those processes and quantifies the necessary modifications in existing
|
hep-ph/9804292
|
Fumiaki Araki Quark Nuclear Physics Group
|
Fumiaki Araki, Hideo Suganuma, Hiroshi Toki (RCNP, Osaka Univ.)
|
Behavior of monopole trajectories in the instanton and anti-instanton
system at finite temperature
|
Talk presented by F. Araki at ``INNOCOM '97'', XVII RCNP the
International Symposium on Innovative Computational Methods in Nuclear
Many-Body Problems, Osaka, Japan, 10 - 15 November 1997. LaTeX, uses
epsbox.sty and sprocl.sty, 3 pages, 2 figures included
| null | null | null |
hep-ph
| null |
We study the connection between monopoles and instantons in the Polyakov-like
gauge, and the behavior of the monopole trajectories generated by instantons at
finite temperature. The monopole trajectories become long and complicated at
the zero-temperature which can be regarded as monopole condensation. On the
other hand, they tend to become simple at finite temperature. It is suggested
that such a change is related to the confinement-deconfinement phase
transition.
|
[
{
"created": "Wed, 15 Apr 1998 07:54:04 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Araki",
"Fumiaki",
"",
"RCNP, Osaka Univ."
],
[
"Suganuma",
"Hideo",
"",
"RCNP, Osaka Univ."
],
[
"Toki",
"Hiroshi",
"",
"RCNP, Osaka Univ."
]
] |
We study the connection between monopoles and instantons in the Polyakov-like gauge, and the behavior of the monopole trajectories generated by instantons at finite temperature. The monopole trajectories become long and complicated at the zero-temperature which can be regarded as monopole condensation. On the other hand, they tend to become simple at finite temperature. It is suggested that such a change is related to the confinement-deconfinement phase transition.
|
hep-ph/0510097
|
Dan Hooper
|
Dan Hooper
|
Probing Exotic Physics With Cosmic Neutrinos
|
11 pages, 6 figures; For the proceedings of From Colliders To Cosmic
Rays, Prague, Czech Republic, September 7-13, 2005
|
Czech.J.Phys.56:A337-A347,2006
|
10.1007/s10582-006-0167-6
|
FERMILAB-CONF-05-421-A
|
hep-ph astro-ph
| null |
Traditionally, collider experiments have been the primary tool used in
searching for particle physics beyond the Standard Model. In this talk, I will
discuss alternative approaches for exploring exotic physics scenarios using
high energy and ultra-high energy cosmic neutrinos. Such neutrinos can be used
to study interactions at energies higher, and over baselines longer, than those
accessible to colliders. In this way, neutrino astronomy can provide a window
into fundamental physics which is highly complementary to collider techniques.
I will discuss the role of neutrino astronomy in fundamental physics,
considering the use of such techniques in studying several specific scenarios
including low scale gravity models, Standard Model electroweak instanton
induced interactions, decaying neutrinos and quantum decoherence.
|
[
{
"created": "Fri, 7 Oct 2005 16:24:11 GMT",
"version": "v1"
}
] |
2014-11-18
|
[
[
"Hooper",
"Dan",
""
]
] |
Traditionally, collider experiments have been the primary tool used in searching for particle physics beyond the Standard Model. In this talk, I will discuss alternative approaches for exploring exotic physics scenarios using high energy and ultra-high energy cosmic neutrinos. Such neutrinos can be used to study interactions at energies higher, and over baselines longer, than those accessible to colliders. In this way, neutrino astronomy can provide a window into fundamental physics which is highly complementary to collider techniques. I will discuss the role of neutrino astronomy in fundamental physics, considering the use of such techniques in studying several specific scenarios including low scale gravity models, Standard Model electroweak instanton induced interactions, decaying neutrinos and quantum decoherence.
|
hep-ph/9503326
| null |
M. Gourdin, Y. Y. Keum, and X. Y. Pham
|
A Model for the decay of the $D_s^{+}$ meson into three pions,
|
23 pages (Latex) including 7 figures (Postscript file).
|
Phys.Rev. D53 (1996) 3687-3699
|
10.1103/PhysRevD.53.3687
|
Preprint PAR/LPTHE/95-09
|
hep-ph
| null |
We propose a phenomenological two component model describing the decay
amplitude of the process $D_s^{+} \ra 3 \pi$, whose rate has been found
surprisingly large. The first component is a constant background $F_{NR}$, and
the second one is a Breit-Wigner type amplitude associated to a quasi two body
$f_0(980)$ $\pi^{+}$ state. We show that it is possible to reproduce the
observed rate for $D_s^{+} \ra \pi^{+}\pi^{+}\pi^{-}$ as well as the two other
measured branching ratios for the non resonant part and the resonant
$f_0\pi^{+}$ one, with a common parameter $F_{NR}$. Predictions are given for
the $D_s^{+} \ra \pi^{0}\pi^{0}\pi^{+}$ rates, as well as for the various
$\pi^{+}$ and $\pi^{-}$, or $\pi^{0}$ and $\pi^{+}$ energy distributions for
the two possible final states.
|
[
{
"created": "Tue, 14 Mar 1995 14:38:49 GMT",
"version": "v1"
}
] |
2015-06-25
|
[
[
"Gourdin",
"M.",
""
],
[
"Keum",
"Y. Y.",
""
],
[
"Pham",
"X. Y.",
""
]
] |
We propose a phenomenological two component model describing the decay amplitude of the process $D_s^{+} \ra 3 \pi$, whose rate has been found surprisingly large. The first component is a constant background $F_{NR}$, and the second one is a Breit-Wigner type amplitude associated to a quasi two body $f_0(980)$ $\pi^{+}$ state. We show that it is possible to reproduce the observed rate for $D_s^{+} \ra \pi^{+}\pi^{+}\pi^{-}$ as well as the two other measured branching ratios for the non resonant part and the resonant $f_0\pi^{+}$ one, with a common parameter $F_{NR}$. Predictions are given for the $D_s^{+} \ra \pi^{0}\pi^{0}\pi^{+}$ rates, as well as for the various $\pi^{+}$ and $\pi^{-}$, or $\pi^{0}$ and $\pi^{+}$ energy distributions for the two possible final states.
|
1906.09229
|
Jose Bordes
|
Jos\'e BORDES (1), CHAN Hong-Mo (2) and TSOU Sheung Tsun (3) ((1)
Departament Fisica Teorica and IFIC, CSIC-Universitat de Valencia, Spain, (2)
Rutherford Appleton Laboratory, United Kingdom, (3) Mathematical Institute,
University of Oxford, United Kingdom)
|
Accommodating three low-scale anomalies (g-2, Lamb shift, and Atomki) in
the framed standard model
| null | null |
10.1142/S0217751X19501409
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The framed standard model (FSM) predicts a $0^+$ boson with mass around 20
MeV in the "hidden sector", which mixes at tree level with the standard Higgs
$h_W$ and hence acquires small couplings to quarks and leptons which can be
calculated in the FSM apart from the mixing parameter $\rho_{Uh}$. The exchange
of this mixed state $U$ will contribute to $g - 2$ and to the Lamb shift. By
adjusting $\rho_{Uh}$ alone, it is found that the FSM can satisfy all present
experimental bounds on the $g - 2$ and Lamb shift anomalies for $\mu$ and $e$,
and for the latter for both hydrogen and deuterium.
The FSM predicts also a $1^-$ boson in the "hidden sector" with a mass of 17
MeV, that is, right on top of the Atomki anomaly $X$. This mixes with the
photon at 1-loop level and couples thereby like a dark photon to quarks and
leptons. It is however a compound state and is thought likely to possess
additional compound couplings to hadrons. By adjusting the mixing parameter and
the $X$'s compound coupling to nucleons, the FSM can reproduce the production
rate of the $X$ in beryllium decay as well as satisfy all the bounds on $X$
listed so far in the literature.
The above two results are consistent in that the $U$, being $0^+$, does not
contribute to the Atomki anomaly if parity and angular momentum are conserved,
while $X$, though contributing to $g - 2$ and Lamb shift, has smaller couplings
than $U$ and can, at first instance, be neglected there.
Despite the tentative nature of the 3 anomalies in experiment and of the FSM
as theory, the accommodation of the former in the latter has strengthened the
credibility of both. If this FSM interpretation were correct, it would change
the whole aspect of the anomalies from just curiosities to windows into a vast
hitherto hidden sector comprising at least in part the dark matter which makes
up the bulk of our universe.
|
[
{
"created": "Fri, 21 Jun 2019 16:31:20 GMT",
"version": "v1"
}
] |
2019-09-25
|
[
[
"BORDES",
"José",
""
],
[
"Hong-Mo",
"CHAN",
""
],
[
"Tsun",
"TSOU Sheung",
""
]
] |
The framed standard model (FSM) predicts a $0^+$ boson with mass around 20 MeV in the "hidden sector", which mixes at tree level with the standard Higgs $h_W$ and hence acquires small couplings to quarks and leptons which can be calculated in the FSM apart from the mixing parameter $\rho_{Uh}$. The exchange of this mixed state $U$ will contribute to $g - 2$ and to the Lamb shift. By adjusting $\rho_{Uh}$ alone, it is found that the FSM can satisfy all present experimental bounds on the $g - 2$ and Lamb shift anomalies for $\mu$ and $e$, and for the latter for both hydrogen and deuterium. The FSM predicts also a $1^-$ boson in the "hidden sector" with a mass of 17 MeV, that is, right on top of the Atomki anomaly $X$. This mixes with the photon at 1-loop level and couples thereby like a dark photon to quarks and leptons. It is however a compound state and is thought likely to possess additional compound couplings to hadrons. By adjusting the mixing parameter and the $X$'s compound coupling to nucleons, the FSM can reproduce the production rate of the $X$ in beryllium decay as well as satisfy all the bounds on $X$ listed so far in the literature. The above two results are consistent in that the $U$, being $0^+$, does not contribute to the Atomki anomaly if parity and angular momentum are conserved, while $X$, though contributing to $g - 2$ and Lamb shift, has smaller couplings than $U$ and can, at first instance, be neglected there. Despite the tentative nature of the 3 anomalies in experiment and of the FSM as theory, the accommodation of the former in the latter has strengthened the credibility of both. If this FSM interpretation were correct, it would change the whole aspect of the anomalies from just curiosities to windows into a vast hitherto hidden sector comprising at least in part the dark matter which makes up the bulk of our universe.
|
2111.11117
|
Massimo Mannarelli
|
Massimo Mannarelli, Fabrizio Canfora, Stefano Carignano, Marcela Lagos
and Aldo Vera
|
Inhomogeneous pion condensed phase hosting topologically stable baryons
|
8 pages, 4 figures, contribution to the proceedings of "A Virtual
Tribute to Quark Confinement and the Hadron Spectrum" August 2nd-6th 2021
(online)
| null |
10.1051/epjconf/202225807003
| null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss the inhomogeneous pion condensed phase within the framework of
chiral perturbation theory. We show how the general expression of the
condensate can be obtained solving three coupled differential equations,
expressing how the pion fields are modulated in space. Upon using some
simplifying assumptions, we determine an analytic solution in (3+1)-dimensions.
The obtained inhomogeneous condensate is characterized by a non-vanishing
topological charge, which can be identified with the baryonic number. In this
way, we obtain an inhomogeneous system of pions hosting an arbitrary number of
baryons at fixed positions in space.
|
[
{
"created": "Mon, 22 Nov 2021 11:18:02 GMT",
"version": "v1"
}
] |
2022-02-16
|
[
[
"Mannarelli",
"Massimo",
""
],
[
"Canfora",
"Fabrizio",
""
],
[
"Carignano",
"Stefano",
""
],
[
"Lagos",
"Marcela",
""
],
[
"Vera",
"Aldo",
""
]
] |
We discuss the inhomogeneous pion condensed phase within the framework of chiral perturbation theory. We show how the general expression of the condensate can be obtained solving three coupled differential equations, expressing how the pion fields are modulated in space. Upon using some simplifying assumptions, we determine an analytic solution in (3+1)-dimensions. The obtained inhomogeneous condensate is characterized by a non-vanishing topological charge, which can be identified with the baryonic number. In this way, we obtain an inhomogeneous system of pions hosting an arbitrary number of baryons at fixed positions in space.
|
2404.14091
|
Farid Taghinavaz
|
Roya Heydari, Farid Taghinavaz
|
Local univalence versus stability and causality in hydrodynamic models
|
24 pages, 10 figures, comments are welcome
| null | null | null |
hep-ph hep-th math-ph math.MP nucl-th
|
http://creativecommons.org/licenses/by/4.0/
|
Our main objective is to compare the analytic properties of hydrodynamic
series with the stability and causality conditions applied to hydrodynamic
modes. Analyticity, in this context, implies that the hydrodynamic series
behaves as a univalent or single-valued function. Stability and causality
adhere to physical constraints where hydrodynamic modes neither exhibit
exponential growth nor travel faster than the speed of light. Through an
examination of various hydrodynamic models, such as the Muller-Israel-Stewart
(MIS) and the first-order hydro models like the BDNK
(Bemfica-Disconzi-Noronha-Kovtun) model, we observe no new restrictions
stemming from the analyticity limits in the shear channel of these models.
However, local univalence is maintained in the sound channel of these models
despite the global divergence of the hydrodynamic series. Notably, differences
in the sound equations between the MIS and BDNK models lead to distinct
analyticity limits. The MIS model's sound mode remains univalent at high
momenta within a specific transport range. Conversely, in the BDNK model, the
univalence of the sound mode extends to intermediate momenta across all stable
and causal regions. Generally, the convergence radius is independent of
univalence and the given dispersion relation predominantly influences their
correlation. For second-order frequency dispersions, the relationship is
precise, i.e. within the convergence radius, the hydro series demonstrates
univalence. However, with higher-order dispersions, the hydro series is locally
univalent within certain transport regions, which may fall within or outside
the stable and causal zones.
|
[
{
"created": "Mon, 22 Apr 2024 11:22:02 GMT",
"version": "v1"
}
] |
2024-04-23
|
[
[
"Heydari",
"Roya",
""
],
[
"Taghinavaz",
"Farid",
""
]
] |
Our main objective is to compare the analytic properties of hydrodynamic series with the stability and causality conditions applied to hydrodynamic modes. Analyticity, in this context, implies that the hydrodynamic series behaves as a univalent or single-valued function. Stability and causality adhere to physical constraints where hydrodynamic modes neither exhibit exponential growth nor travel faster than the speed of light. Through an examination of various hydrodynamic models, such as the Muller-Israel-Stewart (MIS) and the first-order hydro models like the BDNK (Bemfica-Disconzi-Noronha-Kovtun) model, we observe no new restrictions stemming from the analyticity limits in the shear channel of these models. However, local univalence is maintained in the sound channel of these models despite the global divergence of the hydrodynamic series. Notably, differences in the sound equations between the MIS and BDNK models lead to distinct analyticity limits. The MIS model's sound mode remains univalent at high momenta within a specific transport range. Conversely, in the BDNK model, the univalence of the sound mode extends to intermediate momenta across all stable and causal regions. Generally, the convergence radius is independent of univalence and the given dispersion relation predominantly influences their correlation. For second-order frequency dispersions, the relationship is precise, i.e. within the convergence radius, the hydro series demonstrates univalence. However, with higher-order dispersions, the hydro series is locally univalent within certain transport regions, which may fall within or outside the stable and causal zones.
|
hep-ph/9810270
|
Bodo Lampe
|
Bodo Lampe and Ewald Reya
|
Spin Physics and Polarized Structure Functions
|
134 pages (latex) and 64 figures (eps)
|
Phys.Rept.332:1-163,2000
|
10.1016/S0370-1573(99)00100-3
|
MPI-PhT/98-23,DO-TH 98/02
|
hep-ph
| null |
A review on the theoretical aspects and the experimental results of polarized
deep inelastic scattering and of other hard scattering processes is presented.
The following items are discussed: longitudinally polarized structure
functions, results from the SLAC and CERN polarization experiments, the QCD
interpretation and the LO and NLO Q2-evolution of g1, the role of the polarized
gluon density, the expectations for x-->0, sum rules, the first moment of the
polarized structure function, the parametrizations of polarized parton
densities, polarized jet, heavy quark and direct photon production, DIS
semi-inclusive asymmetries and elastic neutrino-proton scattering, single and
double spin asymmetries, structure functions for higher spin hadrons and
nuclei, nonperturbative approaches, the transverse structure function g2,
chiral-odd 'transversity' distributions.
|
[
{
"created": "Wed, 7 Oct 1998 10:12:54 GMT",
"version": "v1"
}
] |
2011-01-25
|
[
[
"Lampe",
"Bodo",
""
],
[
"Reya",
"Ewald",
""
]
] |
A review on the theoretical aspects and the experimental results of polarized deep inelastic scattering and of other hard scattering processes is presented. The following items are discussed: longitudinally polarized structure functions, results from the SLAC and CERN polarization experiments, the QCD interpretation and the LO and NLO Q2-evolution of g1, the role of the polarized gluon density, the expectations for x-->0, sum rules, the first moment of the polarized structure function, the parametrizations of polarized parton densities, polarized jet, heavy quark and direct photon production, DIS semi-inclusive asymmetries and elastic neutrino-proton scattering, single and double spin asymmetries, structure functions for higher spin hadrons and nuclei, nonperturbative approaches, the transverse structure function g2, chiral-odd 'transversity' distributions.
|
2306.10828
|
Xing-Yu Yang
|
Kenji Kadota, Jeong Han Kim, Pyungwon Ko, Xing-Yu Yang
|
Gravitational wave probes on self-interacting dark matter surrounding an
intermediate mass black hole
|
12 pages, 7 figures, 1 table; matches the published version
|
Phys. Rev. D 109, 015022 (2024)
|
10.1103/PhysRevD.109.015022
| null |
hep-ph astro-ph.CO gr-qc hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The presence of dark matter overdensities surrounding a black hole can
influence the evolution of a binary system. The gravitational wave signals
emitted by a black hole binary offer a promising means to probe the dark matter
environments near a black hole. The dense region of dark matter can lead to the
dephasing of gravitational waveforms, which can be detected by upcoming
experiments such as the Laser Interferometer Space Antenna (LISA). The dark
matter density profile around the black hole can vary for different dark matter
models. Our study specifically investigates the impact of the ultralight
self-interacting scalar dark matter (SIDM) on the gravitational wave signals
emitted by black hole binaries. A distinctive characteristic of SIDM
surrounding a black hole, as opposed to collisionless dark matter, is the
formation of a soliton core. We perform a Fisher matrix analysis to estimate
the size of the soliton and the corresponding SIDM parameter space that future
LISA-like gravitational wave experiments can explore.
|
[
{
"created": "Mon, 19 Jun 2023 10:19:00 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Jan 2024 01:09:07 GMT",
"version": "v2"
}
] |
2024-01-24
|
[
[
"Kadota",
"Kenji",
""
],
[
"Kim",
"Jeong Han",
""
],
[
"Ko",
"Pyungwon",
""
],
[
"Yang",
"Xing-Yu",
""
]
] |
The presence of dark matter overdensities surrounding a black hole can influence the evolution of a binary system. The gravitational wave signals emitted by a black hole binary offer a promising means to probe the dark matter environments near a black hole. The dense region of dark matter can lead to the dephasing of gravitational waveforms, which can be detected by upcoming experiments such as the Laser Interferometer Space Antenna (LISA). The dark matter density profile around the black hole can vary for different dark matter models. Our study specifically investigates the impact of the ultralight self-interacting scalar dark matter (SIDM) on the gravitational wave signals emitted by black hole binaries. A distinctive characteristic of SIDM surrounding a black hole, as opposed to collisionless dark matter, is the formation of a soliton core. We perform a Fisher matrix analysis to estimate the size of the soliton and the corresponding SIDM parameter space that future LISA-like gravitational wave experiments can explore.
|
hep-ph/9209219
|
Geert Jan van Oldenborgh
|
J. Bl\"umlein, G. J. van Oldenborgh and R. R\"uckl
|
QCD and QED Corrections to Higgs Boson Production in Charged Current
$ep$ Scattering
|
latex, 16 pages + 9 pages figures in PostScript (included)
|
Nucl.Phys. B395 (1993) 35-59
|
10.1016/0550-3213(93)90207-6
|
CERN-TH.6581/92, MPI-Ph/91-46, LMU-92/06
|
hep-ph
| null |
First order QCD and leading QED corrections to Higgs boson production in the
channel $e^-p \to \nu H^0 X; H^0 \to b\bar{b}$ are calculated for the
kinematical conditions at LEP $\otimes$ LHC ($\sqrt{s} = 1360 \GeV$) and the
interesting mass range $80 < M_H < 150 \GeV$. In the DIS scheme the QCD
corrections (not including the corrections to the branching ratio, which are
well-known) are found to be about 1\% for the total cross section and $-13\%$
to $-10\%$ for the observable cross section as defined by appropriate cuts. The
latter results depend on the definition of these cuts. The QED corrections
amount to about $-5\%$. Also obtainable with anonymous ftp from
gluon.hep.physik.uni-muenchen.de.
|
[
{
"created": "Mon, 7 Sep 1992 13:33:56 GMT",
"version": "v1"
}
] |
2009-10-22
|
[
[
"Blümlein",
"J.",
""
],
[
"van Oldenborgh",
"G. J.",
""
],
[
"Rückl",
"R.",
""
]
] |
First order QCD and leading QED corrections to Higgs boson production in the channel $e^-p \to \nu H^0 X; H^0 \to b\bar{b}$ are calculated for the kinematical conditions at LEP $\otimes$ LHC ($\sqrt{s} = 1360 \GeV$) and the interesting mass range $80 < M_H < 150 \GeV$. In the DIS scheme the QCD corrections (not including the corrections to the branching ratio, which are well-known) are found to be about 1\% for the total cross section and $-13\%$ to $-10\%$ for the observable cross section as defined by appropriate cuts. The latter results depend on the definition of these cuts. The QED corrections amount to about $-5\%$. Also obtainable with anonymous ftp from gluon.hep.physik.uni-muenchen.de.
|
0902.4501
|
Yoshio Koide
|
Yoshio Koide
|
Can Massless and Light Yukawaons be Harmless?
|
version accepted by IJMPA, 14 pages, no figure, title and
presentation changed
| null |
10.1142/S0217751X10048068
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In the so-called yukawaon model, where the effective Yukawa coupling
constants Y_f^{eff} (f=e,\nu,u,d) are given by vacuum expectation values (VEVs)
of gauge singlet scalars (yukawaons) Y_f with 3\times 3 components, i.e.
Y_f^{eff}= y_f < Y_f>/\Lambda, massless (and light) scalars appear because a
global flavor symmetry is assumed. In order to demonstrate whether such
massless scalars in the yukawaon model are harmless or not, yukawaon masses are
explicitly estimated, as an example, in the charged lepton sector.
|
[
{
"created": "Thu, 26 Feb 2009 02:57:37 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Nov 2009 09:56:46 GMT",
"version": "v2"
}
] |
2015-05-13
|
[
[
"Koide",
"Yoshio",
""
]
] |
In the so-called yukawaon model, where the effective Yukawa coupling constants Y_f^{eff} (f=e,\nu,u,d) are given by vacuum expectation values (VEVs) of gauge singlet scalars (yukawaons) Y_f with 3\times 3 components, i.e. Y_f^{eff}= y_f < Y_f>/\Lambda, massless (and light) scalars appear because a global flavor symmetry is assumed. In order to demonstrate whether such massless scalars in the yukawaon model are harmless or not, yukawaon masses are explicitly estimated, as an example, in the charged lepton sector.
|
hep-ph/0102157
|
Utpal Chattopadhyay
|
Utpal Chattopadhyay and Pran Nath
|
Upper Limits on Sparticle Masses from g-2 and the Possibility for
Discovery of Supersymmetry at Colliders and in Dark Matter Searches
|
4 pages. Large tan\beta cases included. To appear in Phys. Rev. Lett
|
Phys.Rev.Lett. 86 (2001) 5854-5857
|
10.1103/PhysRevLett.86.5854
|
TIFR/TH/01-05, CERN-TH/2001-043
|
hep-ph hep-th
| null |
We analyze the implications of the new physics effect seen in the $g-2$
Brookhaven measurement and show that if the effect arises from supersymmetry,
then the sign of the Higgs mixing parameter $\mu$ is determined to be positive
in the standard sign convention. Further, analyses within the minimal
supergravity model show that the Brookhaven result leads to upper limits on the
universal gaugino and scalar masses of $m_{1/2}\leq 800$ GeV and $m_0\leq 1.5$
TeV for $\tan\beta\leq 55$. Our analysis strongly suggests that supersymmetry
via production of sparticles must be found at the Large Hadron Collider.
Further, sign($\mu$) positive is favorable for the discovery of supersymmetric
cold dark matter.
|
[
{
"created": "Tue, 13 Feb 2001 22:57:50 GMT",
"version": "v1"
},
{
"created": "Tue, 29 May 2001 19:58:23 GMT",
"version": "v2"
}
] |
2009-11-07
|
[
[
"Chattopadhyay",
"Utpal",
""
],
[
"Nath",
"Pran",
""
]
] |
We analyze the implications of the new physics effect seen in the $g-2$ Brookhaven measurement and show that if the effect arises from supersymmetry, then the sign of the Higgs mixing parameter $\mu$ is determined to be positive in the standard sign convention. Further, analyses within the minimal supergravity model show that the Brookhaven result leads to upper limits on the universal gaugino and scalar masses of $m_{1/2}\leq 800$ GeV and $m_0\leq 1.5$ TeV for $\tan\beta\leq 55$. Our analysis strongly suggests that supersymmetry via production of sparticles must be found at the Large Hadron Collider. Further, sign($\mu$) positive is favorable for the discovery of supersymmetric cold dark matter.
|
1504.01740
|
Sunghoon Jung
|
Brian Batell, Sunghoon Jung
|
Probing Light Stops with Stoponium
|
35 pages, 33 figures. v2: references added
| null | null | null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We derive new limits on light stops from diboson resonance searches in the
$\gamma\gamma$, $Z \gamma$, $ZZ$, $WW$ and $hh$ channels from the first run of
the LHC. If the two-body decays of the light stop are mildly suppressed or
kinematically forbidden, stoponium bound states will form in $pp$ collisions
and subsequently decay via the pair annihilation of the constituent stops to
diboson final states, yielding striking resonance signatures. Remarkably, we
find that stoponium searches are highly complementary to direct collider
searches and indirect probes of light stops such as Higgs coupling
measurements. Using an empirical quarkonia potential model and including the
first two $S$-wave stoponium states, we find that in the decoupling limit
$m_{\widetilde t_1} \lesssim 130$ GeV is excluded for any value of the stop
mixing angle and heavy stop mass by the combination of the latest resonance
searches and the indirect constraints. The $\gamma \gamma$ searches are the
most complementary to the indirect constraints, probing the stop "blind spot"
parameter region in which the $h^0 \tilde t_1 \tilde t_1^*$ trilinear coupling
is small. Interestingly, we also find that the $Z\gamma$ searches give a
stronger constraint, $m_{\widetilde t_1} \lesssim 170$ GeV, if the stop is
primarily left-handed. For a scenario with a bino LSP and stop NLSP, several
gaps in the direct collider searches for stops can unambiguously be filled with
the next run of the LHC. For a stop LSP decaying through an R-parity violating
$UDD$ coupling, the stoponium searches can fill the gap 100 GeV $\lesssim
m_{\tilde t_1} \lesssim 200$ GeV in the direct searches for couplings $\lambda"
\lesssim 10^{-2}$.
|
[
{
"created": "Tue, 7 Apr 2015 20:00:53 GMT",
"version": "v1"
},
{
"created": "Wed, 3 Jun 2015 06:23:41 GMT",
"version": "v2"
}
] |
2015-06-04
|
[
[
"Batell",
"Brian",
""
],
[
"Jung",
"Sunghoon",
""
]
] |
We derive new limits on light stops from diboson resonance searches in the $\gamma\gamma$, $Z \gamma$, $ZZ$, $WW$ and $hh$ channels from the first run of the LHC. If the two-body decays of the light stop are mildly suppressed or kinematically forbidden, stoponium bound states will form in $pp$ collisions and subsequently decay via the pair annihilation of the constituent stops to diboson final states, yielding striking resonance signatures. Remarkably, we find that stoponium searches are highly complementary to direct collider searches and indirect probes of light stops such as Higgs coupling measurements. Using an empirical quarkonia potential model and including the first two $S$-wave stoponium states, we find that in the decoupling limit $m_{\widetilde t_1} \lesssim 130$ GeV is excluded for any value of the stop mixing angle and heavy stop mass by the combination of the latest resonance searches and the indirect constraints. The $\gamma \gamma$ searches are the most complementary to the indirect constraints, probing the stop "blind spot" parameter region in which the $h^0 \tilde t_1 \tilde t_1^*$ trilinear coupling is small. Interestingly, we also find that the $Z\gamma$ searches give a stronger constraint, $m_{\widetilde t_1} \lesssim 170$ GeV, if the stop is primarily left-handed. For a scenario with a bino LSP and stop NLSP, several gaps in the direct collider searches for stops can unambiguously be filled with the next run of the LHC. For a stop LSP decaying through an R-parity violating $UDD$ coupling, the stoponium searches can fill the gap 100 GeV $\lesssim m_{\tilde t_1} \lesssim 200$ GeV in the direct searches for couplings $\lambda" \lesssim 10^{-2}$.
|
0808.0022
|
Elena Bratkovskaya
|
W. Cassing (U. Giessen) and E.L. Bratkovskaya (FIAS, U. Frankfurt)
|
Parton transport and hadronization from the dynamical quasiparticle
point of view
|
9 pages, 8 figures, to be published in Phys. Rev. C
|
Phys.Rev.C78:034919,2008
|
10.1103/PhysRevC.78.034919
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The hadronization of an expanding partonic fireball is studied within the
Parton-Hadron-Strings Dynamics (PHSD) approach which is based on a dynamical
quasiparticle model (DQPM) matched to reproduce lattice QCD results in
thermodynamic equilibrium. Apart from strong parton interactions the expansion
and development of collective flow is driven by strong gradients in the parton
mean-fields. An analysis of the elliptic flow $v_2$ demonstrates a linear
correlation with the spatial eccentricity $\epsilon$ as in case of ideal
hydrodynamics. The hadronization occurs by quark-antiquark fusion or 3 quark/3
antiquark recombination which is described by covariant transition rates. Since
the dynamical quarks become very massive, the formed resonant 'pre-hadronic'
color-dipole states ($q\bar{q}$ or $qqq$) are of high invariant mass, too, and
sequentially decay to the groundstate meson and baryon octets increasing the
total entropy. This solves the entropy problem in hadronization in a natural
way. The resulting particle ratios turn out to be in line with those from a
grandcanonical partition function at temperature $T \approx 170$ MeV rather
independent from the initial temperature and indicate an approximate
strangeness equilibration.
|
[
{
"created": "Thu, 31 Jul 2008 21:10:38 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Sep 2008 00:43:31 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Cassing",
"W.",
"",
"U. Giessen"
],
[
"Bratkovskaya",
"E. L.",
"",
"FIAS, U. Frankfurt"
]
] |
The hadronization of an expanding partonic fireball is studied within the Parton-Hadron-Strings Dynamics (PHSD) approach which is based on a dynamical quasiparticle model (DQPM) matched to reproduce lattice QCD results in thermodynamic equilibrium. Apart from strong parton interactions the expansion and development of collective flow is driven by strong gradients in the parton mean-fields. An analysis of the elliptic flow $v_2$ demonstrates a linear correlation with the spatial eccentricity $\epsilon$ as in case of ideal hydrodynamics. The hadronization occurs by quark-antiquark fusion or 3 quark/3 antiquark recombination which is described by covariant transition rates. Since the dynamical quarks become very massive, the formed resonant 'pre-hadronic' color-dipole states ($q\bar{q}$ or $qqq$) are of high invariant mass, too, and sequentially decay to the groundstate meson and baryon octets increasing the total entropy. This solves the entropy problem in hadronization in a natural way. The resulting particle ratios turn out to be in line with those from a grandcanonical partition function at temperature $T \approx 170$ MeV rather independent from the initial temperature and indicate an approximate strangeness equilibration.
|
1103.1095
|
Qiang Zhao
|
Qian Wang, Xiao-Hai Liu, and Qiang Zhao
|
Open charm effects in $e^+e^-\to J/\psi \eta$, $J/\psi \pi^0$ and
$\phi\eta_c$
|
Revised version to appear in PRD; An error corrected; Slight changes
to the numerical results; Conclusion intact
|
Phys.Rev.D84:014007,2011
|
10.1103/PhysRevD.84.014007
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We propose to study the open charm effects in $e^+ e^-\to J/\psi\eta$,
$J/\psi\pi^0$ and $\phi\eta_c$. We show that the exclusive cross section
lineshapes of these processes would be strongly affected by the open charm
effects. Since the final state light meson productions are through soft gluon
radiations, we assume a recognition of this soft process via charmed meson
loops at hadronic level. A unique feature among these three reactions is that
the $D\bar{D^*}+c.c.$ open channel is located in a relatively isolated energy,
i.e. $\sim 3.876$ GeV, which is sufficiently far away from the known charmonia
$\psi(3770)$ and $\psi(4040)$. Therefore, the cross section lineshapes of these
reactions may provide an opportunity for singling out the open charm effects
with relatively well-defined charmonium contributions. In particular, we find
that reaction $e^+ e^-\to J/\psi\pi^0$ is sensitive to the open charm
$D\bar{D^*}+c.c.$ Due to the dominance of the isospin-0 component at the
charmonium energy region, we predict an enhanced model-independent cusp effect
between the thresholds of $D^0\bar{D}^0+c.c.$ and $D^+ D^{*-}+c.c.$ This study
can also help us to understand the X(3900) enhancement recently observed by
Belle Collaboration in $e^+ e^-\to D\bar{D}+c.c.$
|
[
{
"created": "Sun, 6 Mar 2011 03:10:54 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Jun 2011 06:45:57 GMT",
"version": "v2"
}
] |
2011-08-08
|
[
[
"Wang",
"Qian",
""
],
[
"Liu",
"Xiao-Hai",
""
],
[
"Zhao",
"Qiang",
""
]
] |
We propose to study the open charm effects in $e^+ e^-\to J/\psi\eta$, $J/\psi\pi^0$ and $\phi\eta_c$. We show that the exclusive cross section lineshapes of these processes would be strongly affected by the open charm effects. Since the final state light meson productions are through soft gluon radiations, we assume a recognition of this soft process via charmed meson loops at hadronic level. A unique feature among these three reactions is that the $D\bar{D^*}+c.c.$ open channel is located in a relatively isolated energy, i.e. $\sim 3.876$ GeV, which is sufficiently far away from the known charmonia $\psi(3770)$ and $\psi(4040)$. Therefore, the cross section lineshapes of these reactions may provide an opportunity for singling out the open charm effects with relatively well-defined charmonium contributions. In particular, we find that reaction $e^+ e^-\to J/\psi\pi^0$ is sensitive to the open charm $D\bar{D^*}+c.c.$ Due to the dominance of the isospin-0 component at the charmonium energy region, we predict an enhanced model-independent cusp effect between the thresholds of $D^0\bar{D}^0+c.c.$ and $D^+ D^{*-}+c.c.$ This study can also help us to understand the X(3900) enhancement recently observed by Belle Collaboration in $e^+ e^-\to D\bar{D}+c.c.$
|
0709.1996
|
Manmohan Gupta
|
Harleen Dahiya and Manmohan Gupta
|
$x-$dependence of the quark distribution functions in the
$\chi$CQM$_{{\rm config}}$
|
20 pages, 7 figures. To appear in Eur. Phys. J. C
|
Eur.Phys.J.C52:571-579,2007
|
10.1140/epjc/s10052-007-0419-z
| null |
hep-ph
| null |
Chiral constituent quark model with configuration mixing (\chiCQM_{{\rm
config}}) is known to provide a satisfactory explanation of the ``proton spin
problem'' and related issues. In order to enlarge the scope of \chiCQM_{{\rm
config}}, we have attempted to phenomenologically incorporate x-dependence in
the quark distribution functions. In particular, apart from calculating valence
and sea quark distributions q_{{\rm val}}(x) and \bar q(x), we have carried out
a detailed analysis to estimate the sea quark asymmetries \bar d(x)-\bar u(x),
\bar d(x)/\bar u(x) and \frac{\bar d(x)-\bar u(x)}{u(x)-d(x)} as well as spin
independent structure functions F_2^p(x)-F_2^n(x) and $F_2^n(x)/F_2^p(x)$ as
functions of $x$. We are able to achieve a satisfactory fit for all the above
mentioned quantities simultaneously. The inclusion of effects due to
configuration mixing have also been examined in the case F_2^p(x)-F_2^n(x) and
F_2^n(x)/F_2^p(x) where the valence quark distributions dominate and it is
found that it leads to considerable improvement in the results. Further, the
valence quark structure has also be tested by extrapolating the predictions of
our model in the limit x \to 1 where data is not available.
|
[
{
"created": "Thu, 13 Sep 2007 06:45:11 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Dahiya",
"Harleen",
""
],
[
"Gupta",
"Manmohan",
""
]
] |
Chiral constituent quark model with configuration mixing (\chiCQM_{{\rm config}}) is known to provide a satisfactory explanation of the ``proton spin problem'' and related issues. In order to enlarge the scope of \chiCQM_{{\rm config}}, we have attempted to phenomenologically incorporate x-dependence in the quark distribution functions. In particular, apart from calculating valence and sea quark distributions q_{{\rm val}}(x) and \bar q(x), we have carried out a detailed analysis to estimate the sea quark asymmetries \bar d(x)-\bar u(x), \bar d(x)/\bar u(x) and \frac{\bar d(x)-\bar u(x)}{u(x)-d(x)} as well as spin independent structure functions F_2^p(x)-F_2^n(x) and $F_2^n(x)/F_2^p(x)$ as functions of $x$. We are able to achieve a satisfactory fit for all the above mentioned quantities simultaneously. The inclusion of effects due to configuration mixing have also been examined in the case F_2^p(x)-F_2^n(x) and F_2^n(x)/F_2^p(x) where the valence quark distributions dominate and it is found that it leads to considerable improvement in the results. Further, the valence quark structure has also be tested by extrapolating the predictions of our model in the limit x \to 1 where data is not available.
|
hep-ph/9910390
|
Antonio Pich
|
A. Pich
|
Electroweak Precision Tests
|
11 pages, 9 figures. Invited talk at the International Workshop
``Particles in Astrophysics and Cosmology: from Theory to Observation''
(Valencia, 3-8 May 1999)
|
Nucl.Phys.Proc.Suppl.81:183-193,2000
|
10.1016/S0920-5632(99)00873-7
|
FTUV/99-69, IFIC/99-72
|
hep-ph
| null |
Precision measurements of electroweak observables provide stringent tests of
the Standard Model structure and an accurate determination of its parameters.
An overview of the present experimental status is presented.
|
[
{
"created": "Mon, 18 Oct 1999 16:16:19 GMT",
"version": "v1"
}
] |
2011-01-25
|
[
[
"Pich",
"A.",
""
]
] |
Precision measurements of electroweak observables provide stringent tests of the Standard Model structure and an accurate determination of its parameters. An overview of the present experimental status is presented.
|
hep-ph/9704312
|
Min Seok Baek
|
M.S. Baek, S.Y. Choi and C.S. Kim
|
CP Violation in the Top-Quark Pair Production at a Next Linear Collider
|
45 pages(LaTeX), 10 eps figures, uses epsfig.sty
|
Phys.Rev.D56:6835-6855,1997
|
10.1103/PhysRevD.56.6835
|
YUMS 97-7, SNUTP 97-035
|
hep-ph
| null |
We provide a detailed, model-independent, study for CP violation effects due
to the T-odd top-quark electric dipole moment (EDM) and weak dipole moment
(WDM) in the top-quark pair production via $e^+e^-$ and two-photon annihilation
at a next $e^+e^-$ linear collider (NLC). There are two methods in detecting CP
violation effects in these processes. One method makes use of measurements of
various spin correlations in the final decay products of the produced top-quark
pair, while the other is to measure various CP-odd polarization asymmetry
effects of the initial states. In the $e^+e^-$ case only the first method can
be used, and in the $\gamma\gamma$ case both methods can be employed. We
provide a complete classification of angular correlations of the $t$ and
$\bar{t}$ decay products under CP and CP\tilde{T} which greatly faciliate CP
tests in the $e^+e^-$ mode. Concentrating on the second method with the Compton
back-scattered high-energetic laser light off the electron or positron beam in
the two-photon mode, we construct two CP-odd and CP\tilde{T}-even initial
polarization configurations and apply them to investigating CP-violating
effects due to the top-quark EDM. With a typical set of experimental parameters
at the NLC, we compare the 1-\sigma sensitivities to the top-quark EDM and WDM
in the $e^+e^-$ mode and the two-photon mode. Some model expectation values of
the T-odd parameters are compared with the results.
|
[
{
"created": "Mon, 14 Apr 1997 05:47:14 GMT",
"version": "v1"
}
] |
2016-09-06
|
[
[
"Baek",
"M. S.",
""
],
[
"Choi",
"S. Y.",
""
],
[
"Kim",
"C. S.",
""
]
] |
We provide a detailed, model-independent, study for CP violation effects due to the T-odd top-quark electric dipole moment (EDM) and weak dipole moment (WDM) in the top-quark pair production via $e^+e^-$ and two-photon annihilation at a next $e^+e^-$ linear collider (NLC). There are two methods in detecting CP violation effects in these processes. One method makes use of measurements of various spin correlations in the final decay products of the produced top-quark pair, while the other is to measure various CP-odd polarization asymmetry effects of the initial states. In the $e^+e^-$ case only the first method can be used, and in the $\gamma\gamma$ case both methods can be employed. We provide a complete classification of angular correlations of the $t$ and $\bar{t}$ decay products under CP and CP\tilde{T} which greatly faciliate CP tests in the $e^+e^-$ mode. Concentrating on the second method with the Compton back-scattered high-energetic laser light off the electron or positron beam in the two-photon mode, we construct two CP-odd and CP\tilde{T}-even initial polarization configurations and apply them to investigating CP-violating effects due to the top-quark EDM. With a typical set of experimental parameters at the NLC, we compare the 1-\sigma sensitivities to the top-quark EDM and WDM in the $e^+e^-$ mode and the two-photon mode. Some model expectation values of the T-odd parameters are compared with the results.
|
1906.07659
|
Takashi Toma
|
Giorgio Arcadi, Oleg Lebedev, Stefan Pokorski, Takashi Toma
|
Real Scalar Dark Matter: Relativistic Treatment
|
27 pages, 10 figures, correction to the caption of fig.9
|
JHEP 08 (2019) 050
|
10.1007/JHEP08(2019)050
| null |
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A stable real scalar provides one of the simplest possibilities to account
for dark matter. We consider the regime where its coupling to the Standard
Model fields is negligibly small. Due to self-coupling, the scalar field can
reach thermal or at least kinetic equilibrium, in which case the system is
characterized by its temperature and effective chemical potential. We perform a
fully relativistic analysis of dark matter evolution, thermalization conditions
and different freeze-out regimes, including the chemical potential effects. To
this end, we derive a relativistic Bose-Einstein analog of the Gelmini-Gondolo
formula for a thermal averaged cross section. Finally, we perform a
comprehensive parameter space analysis to determine regions consistent with
observational constraints. Dark matter can be both warm and cold in this model.
|
[
{
"created": "Tue, 18 Jun 2019 15:53:10 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Jun 2019 15:53:10 GMT",
"version": "v2"
}
] |
2019-08-13
|
[
[
"Arcadi",
"Giorgio",
""
],
[
"Lebedev",
"Oleg",
""
],
[
"Pokorski",
"Stefan",
""
],
[
"Toma",
"Takashi",
""
]
] |
A stable real scalar provides one of the simplest possibilities to account for dark matter. We consider the regime where its coupling to the Standard Model fields is negligibly small. Due to self-coupling, the scalar field can reach thermal or at least kinetic equilibrium, in which case the system is characterized by its temperature and effective chemical potential. We perform a fully relativistic analysis of dark matter evolution, thermalization conditions and different freeze-out regimes, including the chemical potential effects. To this end, we derive a relativistic Bose-Einstein analog of the Gelmini-Gondolo formula for a thermal averaged cross section. Finally, we perform a comprehensive parameter space analysis to determine regions consistent with observational constraints. Dark matter can be both warm and cold in this model.
|
2207.02043
|
Zhi-Qing Zhang
|
Zhi-Qing Zhang, Yan-Chao Zhao, Zhi-Lin Guan, Zhi-Jie Sun, Zi-Yu Zhang,
Ke-Yi He
|
Quasi-two-body decays $B_{(s)}\to K^*\gamma\to K\pi\gamma$ in
perturbative QCD approach
|
10 pages, 6 figures
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this work we study the quasi-two-body decays $B\to K^*\gamma\to
K\pi\gamma$ in the perturbative QCD (PQCD) approach. The two-meson distribution
amplitudes (DAs) are introduced to describe the final state interactions of the
$K\pi$ pair, which involve the time-like form factors and the Gegenbauer
polynomials. We calculate the CP averaged branching ratios for the decays
$B_{(s)}\to K^*\gamma\to K\pi\gamma$. Our results are in agreement with the new
update data measured by Belle II, which suggests these quasi-two-body decays
are more appropriate to be analyzed in three-body framework than in the
two-body one. We also predict the direct CP-violation asymmetries for the
considered decay modes and find that $A_{CP}(B_{u,d}\to K^*\gamma\to
K\pi\gamma)$ is small and less than $1\%$ in magnitude, while $A_{CP}(B_{s}\to
K^*\gamma\to K\pi\gamma)$ is larger and can arrive at a few percent. Our
predictions can be tested by the future B meson experiments.
|
[
{
"created": "Tue, 5 Jul 2022 13:38:19 GMT",
"version": "v1"
}
] |
2022-07-06
|
[
[
"Zhang",
"Zhi-Qing",
""
],
[
"Zhao",
"Yan-Chao",
""
],
[
"Guan",
"Zhi-Lin",
""
],
[
"Sun",
"Zhi-Jie",
""
],
[
"Zhang",
"Zi-Yu",
""
],
[
"He",
"Ke-Yi",
""
]
] |
In this work we study the quasi-two-body decays $B\to K^*\gamma\to K\pi\gamma$ in the perturbative QCD (PQCD) approach. The two-meson distribution amplitudes (DAs) are introduced to describe the final state interactions of the $K\pi$ pair, which involve the time-like form factors and the Gegenbauer polynomials. We calculate the CP averaged branching ratios for the decays $B_{(s)}\to K^*\gamma\to K\pi\gamma$. Our results are in agreement with the new update data measured by Belle II, which suggests these quasi-two-body decays are more appropriate to be analyzed in three-body framework than in the two-body one. We also predict the direct CP-violation asymmetries for the considered decay modes and find that $A_{CP}(B_{u,d}\to K^*\gamma\to K\pi\gamma)$ is small and less than $1\%$ in magnitude, while $A_{CP}(B_{s}\to K^*\gamma\to K\pi\gamma)$ is larger and can arrive at a few percent. Our predictions can be tested by the future B meson experiments.
|
1912.10625
|
Martin White Dr
|
Anna Mullin, Stuart Nicholls, Holly Pacey, Michael Parker, Martin
White and Sarah Williams
|
Does SUSY have friends? A new approach for LHC event analysis
|
Version accepted by JHEP
|
Journal of High Energy Physics volume 2021, Article number: 160
(2021)
| null |
ADP-20-1/T1111
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a novel technique for the analysis of proton-proton collision
events from the ATLAS and CMS experiments at the Large Hadron Collider. For a
given final state and choice of kinematic variables, we build a graph network
in which the individual events appear as weighted nodes, with edges between
events defined by their distance in kinematic space. We then show that it is
possible to calculate local metrics of the network that serve as event-by-event
variables for separating signal and background processes, and we evaluate these
for a number of different networks that are derived from different distance
metrics. Using a supersymmetric electroweakino and stop production as examples,
we construct prototype analyses that take account of the fact that the number
of simulated Monte Carlo events used in an LHC analysis may differ from the
number of events expected in the LHC dataset, allowing an accurate background
estimate for a particle search at the LHC to be derived. For the electroweakino
example, we show that the use of network variables outperforms both
cut-and-count analyses that use the original variables and a boosted decision
tree trained on the original variables. The stop example, deliberately chosen
to be difficult to exclude due its kinematic similarity with the top
background, demonstrates that network variables are not automatically sensitive
to BSM physics. Nevertheless, we identify local network metrics that show
promise if their robustness under certain assumptions of node-weighted networks
can be confirmed.
|
[
{
"created": "Mon, 23 Dec 2019 05:26:49 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Jan 2020 16:56:14 GMT",
"version": "v2"
},
{
"created": "Wed, 24 Feb 2021 02:20:47 GMT",
"version": "v3"
}
] |
2021-02-25
|
[
[
"Mullin",
"Anna",
""
],
[
"Nicholls",
"Stuart",
""
],
[
"Pacey",
"Holly",
""
],
[
"Parker",
"Michael",
""
],
[
"White",
"Martin",
""
],
[
"Williams",
"Sarah",
""
]
] |
We present a novel technique for the analysis of proton-proton collision events from the ATLAS and CMS experiments at the Large Hadron Collider. For a given final state and choice of kinematic variables, we build a graph network in which the individual events appear as weighted nodes, with edges between events defined by their distance in kinematic space. We then show that it is possible to calculate local metrics of the network that serve as event-by-event variables for separating signal and background processes, and we evaluate these for a number of different networks that are derived from different distance metrics. Using a supersymmetric electroweakino and stop production as examples, we construct prototype analyses that take account of the fact that the number of simulated Monte Carlo events used in an LHC analysis may differ from the number of events expected in the LHC dataset, allowing an accurate background estimate for a particle search at the LHC to be derived. For the electroweakino example, we show that the use of network variables outperforms both cut-and-count analyses that use the original variables and a boosted decision tree trained on the original variables. The stop example, deliberately chosen to be difficult to exclude due its kinematic similarity with the top background, demonstrates that network variables are not automatically sensitive to BSM physics. Nevertheless, we identify local network metrics that show promise if their robustness under certain assumptions of node-weighted networks can be confirmed.
|
1210.6141
|
Alka Upadhyay
|
Alka Upadhyay, Meenakshi Batra, Pallavi Gupta
|
Heavy-light charm mesons spectroscopy and decay widths
|
16 pages and 12 figures. arXiv admin note: text overlap with
arXiv:hep-ph/0503134 by other authors
|
Prog. Theor. Exp. Phys. 2016 , 053B02
|
10.1093/ptep/ptw036
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present the mass formula for heavy-light charm meson for one loop, using
heavy quark effective theory. Formulating an effective Lagrangian, the masses
of the ground state heavy mesons have been studied in the heavy quark limit
including leading corrections from finite heavy quark masses and nonzero light
quark masses using a constrained fit for the eight equation having eleven
parameters including three coupling constants g, h and g'. Masses determined
from this approach is fitted to the experimentally known decay widths to
estimate the strong coupling constants, showing a better match with available
theoretical and experimental data
|
[
{
"created": "Tue, 23 Oct 2012 06:49:17 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Feb 2016 10:50:49 GMT",
"version": "v2"
}
] |
2016-06-27
|
[
[
"Upadhyay",
"Alka",
""
],
[
"Batra",
"Meenakshi",
""
],
[
"Gupta",
"Pallavi",
""
]
] |
We present the mass formula for heavy-light charm meson for one loop, using heavy quark effective theory. Formulating an effective Lagrangian, the masses of the ground state heavy mesons have been studied in the heavy quark limit including leading corrections from finite heavy quark masses and nonzero light quark masses using a constrained fit for the eight equation having eleven parameters including three coupling constants g, h and g'. Masses determined from this approach is fitted to the experimentally known decay widths to estimate the strong coupling constants, showing a better match with available theoretical and experimental data
|
hep-ph/9807291
|
Yuri Shtanov
|
O.V.Barabash (Shevchenko University, Kiev) and Yu.V.Shtanov
(Bogolyubov Institute, Kiev)
|
Collapse of topological texture
|
23 pages, LaTeX, to be published in Phys. Rev. D
|
Phys.Rev. D58 (1998) 085015
|
10.1103/PhysRevD.58.085015
|
ITP-98-2E
|
hep-ph gr-qc
| null |
We study analytically the process of a topological texture collapse in the
approximation of a scaling ansatz in the nonlinear sigma-model. In this
approximation we show that in flat space-time topological texture eventually
collapses while in the case of spatially flat expanding universe its fate
depends on the rate of expansion. If the universe is inflationary, then there
is a possibility that texture will expand eternally; in the case of exponential
inflation the texture may also shrink or expand eternally to a finite limiting
size, although this behavior is degenerate. In the case of power law
noninflationary expansion topological texture eventually collapses. In a cold
matter dominated universe we find that texture which is formed comoving with
the universe expansion starts collapsing when its spatial size becomes
comparable to the Hubble size, which result is in agreement with the previous
considerations. In the nonlinear sigma-model approximation we consider also the
final stage of the collapsing ellipsoidal topological texture. We show that
during collapse of such a texture at least two of its principal dimensions
shrink to zero in a similar way, so that their ratio remains finite. The third
dimension may remain finite (collapse of cigar type), or it may also shrink to
zero similar to the other two dimensions (collapse of scaling type), or shrink
to zero similar to the product of the remaining two dimensions (collapse of
pancake type).
|
[
{
"created": "Wed, 8 Jul 1998 14:26:00 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Barabash",
"O. V.",
"",
"Shevchenko University, Kiev"
],
[
"Shtanov",
"Yu. V.",
"",
"Bogolyubov Institute, Kiev"
]
] |
We study analytically the process of a topological texture collapse in the approximation of a scaling ansatz in the nonlinear sigma-model. In this approximation we show that in flat space-time topological texture eventually collapses while in the case of spatially flat expanding universe its fate depends on the rate of expansion. If the universe is inflationary, then there is a possibility that texture will expand eternally; in the case of exponential inflation the texture may also shrink or expand eternally to a finite limiting size, although this behavior is degenerate. In the case of power law noninflationary expansion topological texture eventually collapses. In a cold matter dominated universe we find that texture which is formed comoving with the universe expansion starts collapsing when its spatial size becomes comparable to the Hubble size, which result is in agreement with the previous considerations. In the nonlinear sigma-model approximation we consider also the final stage of the collapsing ellipsoidal topological texture. We show that during collapse of such a texture at least two of its principal dimensions shrink to zero in a similar way, so that their ratio remains finite. The third dimension may remain finite (collapse of cigar type), or it may also shrink to zero similar to the other two dimensions (collapse of scaling type), or shrink to zero similar to the product of the remaining two dimensions (collapse of pancake type).
|
1403.7323
|
David H. Lyth
|
David H. Lyth
|
BICEP2, the curvature perturbation and supersymmetry
| null | null |
10.1088/1475-7516/2014/11/003
| null |
hep-ph astro-ph.CO hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The tensor fraction $r\simeq 0.16$ found by BICEP2 corresponds to a Hubble
parameter $H\simeq 1.0\times 10^{14}\GeV$ during inflation.
This has two implications for the (single-field) slow-roll inflation
hypothesis. First, the inflaton perturbation must account for much more than
$10\%$ of the curvature perturbation $\zeta$, which barring fine-tuning means
that it accounts for practically all of it. It follows that a curvaton-like
mechanism for generating $\zeta$ requires an alternative to slow roll such as
k-inflation. Second, accepting slow-roll inflation, the excursion of the
inflaton field is at least of order Planck scale. As a result, the flatness of
the inflaton presumably requires a shift symmetry.
I point out that if such is the case, the resulting potential is likely to
have at least approximately the quadratic form suggested in 1983 by Linde,
which is known to be compatible with the observed $r$ as well as the observed
spectral index $\ns$. The shift symmetry does not require supersymmetry. Also,
the big $H$ may rule out a GUT by restoring the symmetry and producing fatal
cosmic strings. The absence of a GUT would correspond to the absence of
superpartners for the Standard Model particles, which indeed have yet to be
found at the LHC.
It therefore seems quite possible that the quantum field theory chosen by
Nature is not supersymmetric.
|
[
{
"created": "Fri, 28 Mar 2014 10:03:43 GMT",
"version": "v1"
},
{
"created": "Thu, 8 May 2014 14:36:52 GMT",
"version": "v2"
},
{
"created": "Fri, 9 May 2014 14:12:30 GMT",
"version": "v3"
},
{
"created": "Sun, 3 Aug 2014 08:13:39 GMT",
"version": "v4"
}
] |
2015-06-19
|
[
[
"Lyth",
"David H.",
""
]
] |
The tensor fraction $r\simeq 0.16$ found by BICEP2 corresponds to a Hubble parameter $H\simeq 1.0\times 10^{14}\GeV$ during inflation. This has two implications for the (single-field) slow-roll inflation hypothesis. First, the inflaton perturbation must account for much more than $10\%$ of the curvature perturbation $\zeta$, which barring fine-tuning means that it accounts for practically all of it. It follows that a curvaton-like mechanism for generating $\zeta$ requires an alternative to slow roll such as k-inflation. Second, accepting slow-roll inflation, the excursion of the inflaton field is at least of order Planck scale. As a result, the flatness of the inflaton presumably requires a shift symmetry. I point out that if such is the case, the resulting potential is likely to have at least approximately the quadratic form suggested in 1983 by Linde, which is known to be compatible with the observed $r$ as well as the observed spectral index $\ns$. The shift symmetry does not require supersymmetry. Also, the big $H$ may rule out a GUT by restoring the symmetry and producing fatal cosmic strings. The absence of a GUT would correspond to the absence of superpartners for the Standard Model particles, which indeed have yet to be found at the LHC. It therefore seems quite possible that the quantum field theory chosen by Nature is not supersymmetric.
|
2006.04233
|
S Mohan Lakshmi Dr.
|
Lakshmi.S.Mohan
|
Probing the sensitivity to leptonic $\delta_{CP}$ in presence of
invisible decay of $\nu_3$ using atmospheric neutrinos
|
updated reference list
| null |
10.1088/1361-6471/abacd9
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
One of the main neutrino oscillation parameters whose value has not been
determined very precisely is the leptonic $\delta_{CP}$ phase. Since neutrinos
have a tiny but finite mass they can undergo decay both visibly and invisibly.
The effect of invisible decay of the third mass eigen state $\nu_3$ on the
sensitivity to $\delta_{CP}$ is analysed here using atmospheric neutrino and
anti-neutrino events. Effects of detector resolutions and systematic
uncertainties are studied to identify the optimum resolutions and efficiencies
required by a detector to obtain a significant sensitivity even in presence of
decay.
|
[
{
"created": "Sun, 7 Jun 2020 18:55:29 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Jun 2020 12:35:07 GMT",
"version": "v2"
}
] |
2020-10-28
|
[
[
"Mohan",
"Lakshmi. S.",
""
]
] |
One of the main neutrino oscillation parameters whose value has not been determined very precisely is the leptonic $\delta_{CP}$ phase. Since neutrinos have a tiny but finite mass they can undergo decay both visibly and invisibly. The effect of invisible decay of the third mass eigen state $\nu_3$ on the sensitivity to $\delta_{CP}$ is analysed here using atmospheric neutrino and anti-neutrino events. Effects of detector resolutions and systematic uncertainties are studied to identify the optimum resolutions and efficiencies required by a detector to obtain a significant sensitivity even in presence of decay.
|
hep-ph/9512345
| null |
B. Ananthanarayan and Q. Shafi
|
Radiative Electroweak Breaking with Pseudogoldstone Higgs Doublets
|
18 pages plain LaTeX (to be run twice) and 11 figures available
separately from uuencoded files
|
Phys.Rev.D54:3488-3496,1996
|
10.1103/PhysRevD.54.3488
|
UNIL-TP-5/95, BA-95-17
|
hep-ph
| null |
We consider a realistic example of supersymmetric grand unification based on
$SU(3)_c \times SU(3)_L \times SU(3)_R$ in which the electroweak (EW) higgs
doublets are `light' as a consequence of the `pseudogoldstone' mechanism. We
discuss radiative EW breaking in this model, exploring in particular the
`small' (order unity) and `large' $(\approx m_t/m_b)$ $\tan \beta$ regions by
studying the variations of $r (\equiv \sqrt{\mu^2_{1,2}/\mu^2_3})$, where
$\mu^2_{1,2,3}$ are the well known MSSM parameters evaluated at the GUT scale.
For $r$ sufficiently close to unity the quantity $\tan \beta$ can be of order
unity, but the converse is not always true.
|
[
{
"created": "Tue, 19 Dec 1995 09:23:08 GMT",
"version": "v1"
}
] |
2011-05-12
|
[
[
"Ananthanarayan",
"B.",
""
],
[
"Shafi",
"Q.",
""
]
] |
We consider a realistic example of supersymmetric grand unification based on $SU(3)_c \times SU(3)_L \times SU(3)_R$ in which the electroweak (EW) higgs doublets are `light' as a consequence of the `pseudogoldstone' mechanism. We discuss radiative EW breaking in this model, exploring in particular the `small' (order unity) and `large' $(\approx m_t/m_b)$ $\tan \beta$ regions by studying the variations of $r (\equiv \sqrt{\mu^2_{1,2}/\mu^2_3})$, where $\mu^2_{1,2,3}$ are the well known MSSM parameters evaluated at the GUT scale. For $r$ sufficiently close to unity the quantity $\tan \beta$ can be of order unity, but the converse is not always true.
|
hep-ph/0101083
|
Michael Spira
|
M.M. M\"uhlleitner, M. Kr\"amer, M. Spira and P.M. Zerwas
|
Production of MSSM Higgs Bosons in Photon-Photon Collisions
|
9 pages, latex, 3 figures
|
Phys.Lett.B508:311-316,2001
|
10.1016/S0370-2693(01)00321-5
|
DESY 00-192, Edinburgh 2000/31, PM/00-45, PSI-PR-00-19
|
hep-ph
| null |
The heavy neutral Higgs bosons H, A in the minimal supersymmetric extension
of the Standard Model can be produced as single resonances at high-energy gamma
gamma colliders. We have studied the prospects of the search for these
particles in b\bar b and neutralino-pair final states. The Higgs bosons can be
found with masses up to 70-80% of the initial e^\pm e^- collider energy for
medium values of tan(beta), i.e. in areas of the supersymmetric parameter space
not accessible at other colliders.
|
[
{
"created": "Tue, 9 Jan 2001 17:14:28 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Mühlleitner",
"M. M.",
""
],
[
"Krämer",
"M.",
""
],
[
"Spira",
"M.",
""
],
[
"Zerwas",
"P. M.",
""
]
] |
The heavy neutral Higgs bosons H, A in the minimal supersymmetric extension of the Standard Model can be produced as single resonances at high-energy gamma gamma colliders. We have studied the prospects of the search for these particles in b\bar b and neutralino-pair final states. The Higgs bosons can be found with masses up to 70-80% of the initial e^\pm e^- collider energy for medium values of tan(beta), i.e. in areas of the supersymmetric parameter space not accessible at other colliders.
|
1306.6171
|
Vladimir Lomov
|
A.E. Kaloshin, E.A. Kobeleva, V.P. Lomov
|
Opposite parity fermion mixing and baryons $1/2^{\pm}$
|
11 pages, 8 figures
|
Mod. Phys. Lett. A, Vol. 28, No. 34 (2013) 1350156
|
10.1142/S0217732313501563
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We develop a variant of $K$-matrix, which includes the effect of opposite
parity fermions (OPF) mixing, and apply it for description of $\pi N$ partial
waves $S_{11}$ and $P_{11}$. OPF-mixing leads to appearance of negative energy
poles in $K$-matrix and restoration of MacDowell symmetry, relating two partial
waves. Joint analysis of PWA results for $S_{11}$ and $P_{11}$ confirms
significance of this effect.
|
[
{
"created": "Wed, 26 Jun 2013 09:03:53 GMT",
"version": "v1"
}
] |
2013-10-09
|
[
[
"Kaloshin",
"A. E.",
""
],
[
"Kobeleva",
"E. A.",
""
],
[
"Lomov",
"V. P.",
""
]
] |
We develop a variant of $K$-matrix, which includes the effect of opposite parity fermions (OPF) mixing, and apply it for description of $\pi N$ partial waves $S_{11}$ and $P_{11}$. OPF-mixing leads to appearance of negative energy poles in $K$-matrix and restoration of MacDowell symmetry, relating two partial waves. Joint analysis of PWA results for $S_{11}$ and $P_{11}$ confirms significance of this effect.
|
2210.14334
|
Daniel Pitonyak
|
Brandon Bauer, Daniel Pitonyak, and Cody Shay
|
Numerical study of the twist-3 asymmetry $A_{LT}$ in single-inclusive
electron-nucleon and proton-proton collisions
|
21 pages, 14 figures, very minor changes, version to appear in PRD
| null | null | null |
hep-ph hep-ex nucl-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We provide the first rigorous numerical analysis of the
longitudinal-transverse double-spin asymmetry $A_{LT}$ in electron-nucleon and
proton-proton collisions for the case where only a single pion, jet, or photon
is detected in the final state. Given recent extractions of certain, previously
unknown, non-perturbative functions, we are able to compute contributions from
all terms relevant for $A_{LT}$ and make realistic predictions for the
observable at Jefferson Lab (JLab) 12 GeV, COMPASS, the future Electron-Ion
Collider, and the Relativistic Heavy Ion Collider. We also compare our results
to a JLab 6 GeV measurement, which are the only data available for this type of
reaction. The twist-3 nature of $A_{LT}$ makes it a potentially fruitful avenue
to probe quark-gluon-quark correlations in hadrons as well as provide insights
into dynamical quark mass generation in QCD.
|
[
{
"created": "Tue, 25 Oct 2022 21:01:54 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Jan 2023 14:46:00 GMT",
"version": "v2"
}
] |
2023-01-05
|
[
[
"Bauer",
"Brandon",
""
],
[
"Pitonyak",
"Daniel",
""
],
[
"Shay",
"Cody",
""
]
] |
We provide the first rigorous numerical analysis of the longitudinal-transverse double-spin asymmetry $A_{LT}$ in electron-nucleon and proton-proton collisions for the case where only a single pion, jet, or photon is detected in the final state. Given recent extractions of certain, previously unknown, non-perturbative functions, we are able to compute contributions from all terms relevant for $A_{LT}$ and make realistic predictions for the observable at Jefferson Lab (JLab) 12 GeV, COMPASS, the future Electron-Ion Collider, and the Relativistic Heavy Ion Collider. We also compare our results to a JLab 6 GeV measurement, which are the only data available for this type of reaction. The twist-3 nature of $A_{LT}$ makes it a potentially fruitful avenue to probe quark-gluon-quark correlations in hadrons as well as provide insights into dynamical quark mass generation in QCD.
|
2104.06572
|
Xin Liu
|
Yutong Chen, Zewen Jiang, Xin Liu
|
Pure annihilation decays of $B_s^0 \to a_0^+ a_0^-$ and $B_d^0 \to
K_0^{*+} K_0^{*-}$ in the PQCD approach
|
12 pages, 1 figure
|
Communications in Theoretical Physics 73 (2021) 045201
|
10.1088/1572-9494/abe0c1
|
JSNU-PHY-HEP-01/21
|
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We study the {\it CP}-averaged branching fractions and the {\it CP}-violating
asymmetries in the pure annihilation decays of $B_s^0 \to a_0^+ a_0^-$ and
$B_d^0 \to K_0^{*+} K_0^{*-}$, where $a_0\;[K_0^*]$ denotes the scalar
$a_0(980)$ and $a_0(1450)$ [$K_0^*(800) ( {\rm or}\; \kappa)$ and
$K_0^*(1430)$], with the perturbative QCD factorization approach under the
assumption of two-quark structure for the $a_0$ and $K_0^*$ states. The
numerical results show that the branching ratios of the $B_d^0 \to K_0^{*+}
K_0^{*-}$ decays are in the order of $10^{-6}$, while the decay rates of the
$B_s^0 \to a_0^+ a_0^-$ modes are in the order of $10^{-5}$. In light of the
measured modes with the same quark components in the pseudoscalar sector,
namely, $B_d^0 \to K^+ K^-$ and $B_s^0 \to \pi^+ \pi^-$, the predictions for
the considered decay modes in this work are expected to be measured at the
Large Hadron Collider beauty and/or Belle-II experiments in the (near) future.
Meanwhile, it is of great interest to find that the twist-3 distribution
amplitudes $\phi^{S}$ and $\phi^{T}$ with inclusion of the Gegenbauer
polynomials for the scalar $a_0(1450)$ and $K_0^*(1430)$ states in scenario 2
contribute slightly to the branching ratios while significantly to the {\it CP}
violations in the $B_d^0 \to {K_0^*}(1430)^+ {K_0^*}(1430)^-$ and $B_s^0 \to
a_0(1450)^+ a_0(1450)^-$ decays, which indicates that, compared to the
asymptotic $\phi^S$ and $\phi^T$, these Gegenbauer polynomials could change the
strong phases evidently in these pure annihilation decay channels. These
predictions await for the future confirmation experimentally, which could
further provide useful information to help explore the inner structure of the
scalars and shed light on the annihilation decay mechanism.
|
[
{
"created": "Wed, 14 Apr 2021 01:26:23 GMT",
"version": "v1"
}
] |
2021-04-15
|
[
[
"Chen",
"Yutong",
""
],
[
"Jiang",
"Zewen",
""
],
[
"Liu",
"Xin",
""
]
] |
We study the {\it CP}-averaged branching fractions and the {\it CP}-violating asymmetries in the pure annihilation decays of $B_s^0 \to a_0^+ a_0^-$ and $B_d^0 \to K_0^{*+} K_0^{*-}$, where $a_0\;[K_0^*]$ denotes the scalar $a_0(980)$ and $a_0(1450)$ [$K_0^*(800) ( {\rm or}\; \kappa)$ and $K_0^*(1430)$], with the perturbative QCD factorization approach under the assumption of two-quark structure for the $a_0$ and $K_0^*$ states. The numerical results show that the branching ratios of the $B_d^0 \to K_0^{*+} K_0^{*-}$ decays are in the order of $10^{-6}$, while the decay rates of the $B_s^0 \to a_0^+ a_0^-$ modes are in the order of $10^{-5}$. In light of the measured modes with the same quark components in the pseudoscalar sector, namely, $B_d^0 \to K^+ K^-$ and $B_s^0 \to \pi^+ \pi^-$, the predictions for the considered decay modes in this work are expected to be measured at the Large Hadron Collider beauty and/or Belle-II experiments in the (near) future. Meanwhile, it is of great interest to find that the twist-3 distribution amplitudes $\phi^{S}$ and $\phi^{T}$ with inclusion of the Gegenbauer polynomials for the scalar $a_0(1450)$ and $K_0^*(1430)$ states in scenario 2 contribute slightly to the branching ratios while significantly to the {\it CP} violations in the $B_d^0 \to {K_0^*}(1430)^+ {K_0^*}(1430)^-$ and $B_s^0 \to a_0(1450)^+ a_0(1450)^-$ decays, which indicates that, compared to the asymptotic $\phi^S$ and $\phi^T$, these Gegenbauer polynomials could change the strong phases evidently in these pure annihilation decay channels. These predictions await for the future confirmation experimentally, which could further provide useful information to help explore the inner structure of the scalars and shed light on the annihilation decay mechanism.
|
2301.05249
|
Pablo Escribano
|
Diego Portillo-S\'anchez, Pablo Escribano, Avelino Vicente
|
Ultraviolet extensions of the Scotogenic model
|
35 pages, 5 figures, 10 tables; v2: added new topology
| null | null |
IFIC/23-01
|
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
The Scotogenic model is a popular scenario that induces radiative Majorana
neutrino masses and includes a weakly-interacting dark matter candidate. We
classify all possible ultraviolet extensions of the Scotogenic model in which
(i) the dark $\mathbb{Z}_2$ parity emerges at low energies after the
spontaneous breaking of a global $\rm U(1)_L$ lepton number symmetry, and (ii)
the low-energy effective theory contains a naturally small lepton number
breaking parameter, suppressed by the mass of a heavy mediator integrated out
at tree-level. We find $50$ such models and discuss two of them in detail to
illustrate our setup. We also discuss some general aspects of the phenomenology
of the models in our classification, exploring possible lepton flavor violating
signals, collider signatures and implications for dark matter. The
phenomenological prospects of these scenarios are very rich due to the presence
of additional scalar states, including a massless Goldstone boson.
|
[
{
"created": "Thu, 12 Jan 2023 19:01:43 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Mar 2023 12:46:07 GMT",
"version": "v2"
}
] |
2023-03-10
|
[
[
"Portillo-Sánchez",
"Diego",
""
],
[
"Escribano",
"Pablo",
""
],
[
"Vicente",
"Avelino",
""
]
] |
The Scotogenic model is a popular scenario that induces radiative Majorana neutrino masses and includes a weakly-interacting dark matter candidate. We classify all possible ultraviolet extensions of the Scotogenic model in which (i) the dark $\mathbb{Z}_2$ parity emerges at low energies after the spontaneous breaking of a global $\rm U(1)_L$ lepton number symmetry, and (ii) the low-energy effective theory contains a naturally small lepton number breaking parameter, suppressed by the mass of a heavy mediator integrated out at tree-level. We find $50$ such models and discuss two of them in detail to illustrate our setup. We also discuss some general aspects of the phenomenology of the models in our classification, exploring possible lepton flavor violating signals, collider signatures and implications for dark matter. The phenomenological prospects of these scenarios are very rich due to the presence of additional scalar states, including a massless Goldstone boson.
|
hep-ph/0304300
|
Hoang Ngoc Long
|
D. V. Soa, T. Inami and H. N. Long
|
Bilepton production in electron-gamma collisions
|
11 pages, Latex, 6 figures, axodraw.sty used
|
Eur.Phys.J.C34:285-289,2004
|
10.1140/epjc/s2004-01725-5
| null |
hep-ph
| null |
We study the production of bileptons, new gauge boson of lepton number two,
in the minimal 3 - 3 - 1 model in high energy electron - photon collisions. If
the bilepton masses are in the range of 300 GeV the reaction will give
observable cross-sections in the future colliders.
|
[
{
"created": "Wed, 30 Apr 2003 17:41:15 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Soa",
"D. V.",
""
],
[
"Inami",
"T.",
""
],
[
"Long",
"H. N.",
""
]
] |
We study the production of bileptons, new gauge boson of lepton number two, in the minimal 3 - 3 - 1 model in high energy electron - photon collisions. If the bilepton masses are in the range of 300 GeV the reaction will give observable cross-sections in the future colliders.
|
hep-ph/0309263
|
Zuxiang Dai
|
Zuxiang Dai
|
Neutrino in Astrophysics and Cosmology
|
35 pages; paper also available at
http://www.slac.stanford.edu/spires/find/hep/www?irn=5513251
| null | null | null |
hep-ph
| null |
At first we introduce the Neutrino in the standard Model, then the Dirac and
Majorana Masses. After introducing the See-Saw Mechanism, we discuss the
neutrino oscillations and the neutrino in astrophysics and cosmology. We finish
this paper with a brief summary of the neutrino experiments.
|
[
{
"created": "Tue, 23 Sep 2003 14:09:01 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Dai",
"Zuxiang",
""
]
] |
At first we introduce the Neutrino in the standard Model, then the Dirac and Majorana Masses. After introducing the See-Saw Mechanism, we discuss the neutrino oscillations and the neutrino in astrophysics and cosmology. We finish this paper with a brief summary of the neutrino experiments.
|
2012.01960
|
Alessio Maiezza
|
Alessio Maiezza
|
Quark mixing with soft breaking of the parity in the minimal Left-Right
model
|
18 pages, 1 figure
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the possibility of soft breaking effects of the generalized parity
within the minimal Left-Right model. One aim of the paper is to elaborate on
the potentiality, the limit, and the predictivity of a restored parity at high
scale. While revisiting the issue of strong CP in the Left-Right theories, we
motivate the possibility of explicit-parity-breaking, that we then parameterize
in the right-handed quark mixing matrix. The strong CP parameter $\bar{\theta}$
is also parameterized in terms of the breaking. We discuss some possible
phenomenological consequences in this scenario. In particular, the constraint
provided by $\bar{\theta}$ enables us to quantify the maximal deviation of the
right-handed quark mixings from the standard case with exact parity in term of
a single parameter. This deviation has a direct impact on flavor physics.
|
[
{
"created": "Thu, 3 Dec 2020 14:35:22 GMT",
"version": "v1"
}
] |
2020-12-04
|
[
[
"Maiezza",
"Alessio",
""
]
] |
We study the possibility of soft breaking effects of the generalized parity within the minimal Left-Right model. One aim of the paper is to elaborate on the potentiality, the limit, and the predictivity of a restored parity at high scale. While revisiting the issue of strong CP in the Left-Right theories, we motivate the possibility of explicit-parity-breaking, that we then parameterize in the right-handed quark mixing matrix. The strong CP parameter $\bar{\theta}$ is also parameterized in terms of the breaking. We discuss some possible phenomenological consequences in this scenario. In particular, the constraint provided by $\bar{\theta}$ enables us to quantify the maximal deviation of the right-handed quark mixings from the standard case with exact parity in term of a single parameter. This deviation has a direct impact on flavor physics.
|
1105.1672
|
Xiang Liu
|
Dian-Yong Chen, Jun He, Xue-Qian Li and Xiang Liu
|
Dipion invariant mass distribution of the anomalous $\Upsilon(1S)
\pi^{+} \pi^{-}$ and $\Upsilon(2S) \pi^{+} \pi^{-}$ production near the peak
of $\Upsilon(10860)$
|
5 pages, 4 figures, 3 tables. More references added and typos
corrected. Matches version accepted for publication in PRD
|
Phys.Rev.D84:074006,2011
|
10.1103/PhysRevD.84.074006
| null |
hep-ph hep-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Considering the defects of the previous work for estimating the anomalous
production rates of $e^+e^-\to \Upsilon(1S)\pi^+\pi^-,\,\Upsilon(2S)\pi^+\pi^-$
near the peak of the $\Upsilon(5S)$ resonance at $\sqrt s=10.87$ GeV [K.F. Chen
{\it et al}. (Belle Collaboration), Phys. Rev. Lett. {\bf 100}, 112001 (2008)],
we suggest a new scenario where the contributions from the direct dipion
transition and the final state interactions interfere to result in not only the
anomalously large production rates, but also the lineshapes of the differential
widths consistent with the experimental measurement when assuming the reactions
are due to the dipion emission of $\Upsilon(5S)$. At the end, we raise a new
puzzle that the predicted differential width
$d\Gamma(\Upsilon(5S)\to\Upsilon(2S)\pi^+\pi^-)/d\cos\theta$ has a discrepant
trend from the data while other predictions are well in accord with the data.
It should be further clarified by more accurate measurements carried by future
experiments.
|
[
{
"created": "Mon, 9 May 2011 13:59:17 GMT",
"version": "v1"
},
{
"created": "Thu, 26 May 2011 05:48:07 GMT",
"version": "v2"
},
{
"created": "Thu, 25 Aug 2011 21:34:41 GMT",
"version": "v3"
},
{
"created": "Wed, 14 Sep 2011 03:55:05 GMT",
"version": "v4"
}
] |
2011-10-05
|
[
[
"Chen",
"Dian-Yong",
""
],
[
"He",
"Jun",
""
],
[
"Li",
"Xue-Qian",
""
],
[
"Liu",
"Xiang",
""
]
] |
Considering the defects of the previous work for estimating the anomalous production rates of $e^+e^-\to \Upsilon(1S)\pi^+\pi^-,\,\Upsilon(2S)\pi^+\pi^-$ near the peak of the $\Upsilon(5S)$ resonance at $\sqrt s=10.87$ GeV [K.F. Chen {\it et al}. (Belle Collaboration), Phys. Rev. Lett. {\bf 100}, 112001 (2008)], we suggest a new scenario where the contributions from the direct dipion transition and the final state interactions interfere to result in not only the anomalously large production rates, but also the lineshapes of the differential widths consistent with the experimental measurement when assuming the reactions are due to the dipion emission of $\Upsilon(5S)$. At the end, we raise a new puzzle that the predicted differential width $d\Gamma(\Upsilon(5S)\to\Upsilon(2S)\pi^+\pi^-)/d\cos\theta$ has a discrepant trend from the data while other predictions are well in accord with the data. It should be further clarified by more accurate measurements carried by future experiments.
|
0802.4430
|
Rouzbeh Allahverdi
|
Rouzbeh Allahverdi, Anupam Mazumdar
|
Affleck-Dine condensate, late thermalization and the gravitino problem
|
10 pages. Clarifying comments added, final version accepted for
publication in Phys. Rev. D
|
Phys.Rev.D78:043511,2008
|
10.1103/PhysRevD.78.043511
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this clarifying note we discuss the late decay of an Affleck-Dine
condensate by providing a no-go theorem that attributes to conserved global
charges which are identified by the net particle number in fields which are
included in the flat direction(s). For a rotating condensate, this implies
that: (1) the net baryon/lepton number density stored in the condensate is
always conserved, and (2) the total particle number density in the condensate
cannot decrease. This reiterates that, irrespective of possible
non-perturbative particle production due to $D$-terms in a multiple flat
direction case, the prime decay mode of an Affleck-Dine condensate will be
perturbative as originally envisaged. As a result, cosmological consequences of
flat directions such as delayed thermalization as a novel solution to the
gravitino overproduction problem will remain virtually intact.
|
[
{
"created": "Fri, 29 Feb 2008 16:59:21 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Jun 2008 05:42:05 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Allahverdi",
"Rouzbeh",
""
],
[
"Mazumdar",
"Anupam",
""
]
] |
In this clarifying note we discuss the late decay of an Affleck-Dine condensate by providing a no-go theorem that attributes to conserved global charges which are identified by the net particle number in fields which are included in the flat direction(s). For a rotating condensate, this implies that: (1) the net baryon/lepton number density stored in the condensate is always conserved, and (2) the total particle number density in the condensate cannot decrease. This reiterates that, irrespective of possible non-perturbative particle production due to $D$-terms in a multiple flat direction case, the prime decay mode of an Affleck-Dine condensate will be perturbative as originally envisaged. As a result, cosmological consequences of flat directions such as delayed thermalization as a novel solution to the gravitino overproduction problem will remain virtually intact.
|
hep-ph/0209122
|
Rodolfo A. Diaz
|
Rodolfo A. Diaz, R. Martinez, and Nicanor Poveda
|
The process $\mu \to \nu_{e}e\bar{\nu}_{\mu} $in the 2HDM with flavor
changing neutral currents
|
2 pages, no figures
|
Braz.J.Phys.33:831-833,2003
|
10.1590/S0103-97332003000400038
| null |
hep-ph
| null |
We consider the process $\mu \to \nu_{e}e\bar{\nu}_{\mu} $in the framework of
a two Higgs doublet model with flavor changing neutral currents (FCNC). Since
FCNC generates in turn flavor changing charged currents in the lepton sector,
this process appears at tree level mediated by a charged Higgs boson exchange.
From the experimental upper limit for this decay, we obtain the bound $|
\xi_{\mu e}/m_{H^{\pm}}| \leq 3.8\times 10^{-3}$ where$ \xi_{\mu e} $refers to
the mixing between the first and second lepton generations, and $m_{H^{\pm}}
$denotes the mass of the charged Higgs boson. This bound is independent on the
other free parameters of the model. In particular, for $m_{H^{\pm}}\simeq
100$GeV we get $| \xi_{e\mu}| $ $\lesssim 0.38$
|
[
{
"created": "Wed, 11 Sep 2002 18:42:05 GMT",
"version": "v1"
}
] |
2015-06-25
|
[
[
"Diaz",
"Rodolfo A.",
""
],
[
"Martinez",
"R.",
""
],
[
"Poveda",
"Nicanor",
""
]
] |
We consider the process $\mu \to \nu_{e}e\bar{\nu}_{\mu} $in the framework of a two Higgs doublet model with flavor changing neutral currents (FCNC). Since FCNC generates in turn flavor changing charged currents in the lepton sector, this process appears at tree level mediated by a charged Higgs boson exchange. From the experimental upper limit for this decay, we obtain the bound $| \xi_{\mu e}/m_{H^{\pm}}| \leq 3.8\times 10^{-3}$ where$ \xi_{\mu e} $refers to the mixing between the first and second lepton generations, and $m_{H^{\pm}} $denotes the mass of the charged Higgs boson. This bound is independent on the other free parameters of the model. In particular, for $m_{H^{\pm}}\simeq 100$GeV we get $| \xi_{e\mu}| $ $\lesssim 0.38$
|
hep-ph/0102170
|
Marco Battaglia
|
Marco Battaglia
|
Semileptonic B Decays - Recent Results from LEP and Comparison with
Upsilon(4S) Data
|
15 pages, 6 figures, to apper in the Proceedings of the 5th Workshop
on Heavy Quarks at Fixed Target, Rio de Janeiro, October 2000
| null | null | null |
hep-ph
| null |
Recent analyses of the LEP and Upsilon(4S) data have better outlined the
picture of semileptonic B decays. Results on inclusive and exclusive decay
branching fractions and on the extraction of the |Vub| and |Vcb| elements of
the CKM mixing matrix are discussed, together with some of the still open
questions and the sources of model systematics.
|
[
{
"created": "Wed, 14 Feb 2001 13:39:50 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Battaglia",
"Marco",
""
]
] |
Recent analyses of the LEP and Upsilon(4S) data have better outlined the picture of semileptonic B decays. Results on inclusive and exclusive decay branching fractions and on the extraction of the |Vub| and |Vcb| elements of the CKM mixing matrix are discussed, together with some of the still open questions and the sources of model systematics.
|
0905.2772
|
Anosh Joseph
|
Anosh Joseph and S. G. Rajeev
|
Topological Dark Matter in the Little Higgs Models
|
4 pages, 1 figure; minor numerical error fixed
|
Phys.Rev.D80:074009,2009
|
10.1103/PhysRevD.80.074009
|
SU-4252-893
|
hep-ph astro-ph.CO hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We show that certain little Higgs models with symmetry breaking SU(N) ->
SO(N) for N >= 4 admit topologically stable solitons that may contribute to
cosmological dark matter. We have constructed a spherically symmetric soliton
and estimated its mass in the case of SU(5) -> SO(5). Its lower bound is found
to be around 10.3 TeV. Whether this particle is a fermion or a boson depends on
the value of an integer-valued parameter of the underlying theory, analogous to
the number of colors of QCD. In either case, the particle is neutral. If it is
a fermion, it is a Majorana particle, which could take part in a seesaw
mechanism for neutrino masses.
|
[
{
"created": "Sun, 17 May 2009 21:53:01 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Sep 2009 20:31:53 GMT",
"version": "v2"
}
] |
2009-11-06
|
[
[
"Joseph",
"Anosh",
""
],
[
"Rajeev",
"S. G.",
""
]
] |
We show that certain little Higgs models with symmetry breaking SU(N) -> SO(N) for N >= 4 admit topologically stable solitons that may contribute to cosmological dark matter. We have constructed a spherically symmetric soliton and estimated its mass in the case of SU(5) -> SO(5). Its lower bound is found to be around 10.3 TeV. Whether this particle is a fermion or a boson depends on the value of an integer-valued parameter of the underlying theory, analogous to the number of colors of QCD. In either case, the particle is neutral. If it is a fermion, it is a Majorana particle, which could take part in a seesaw mechanism for neutrino masses.
|
2110.13159
|
Jasmine Brewer
|
Jasmine Brewer, Quinn Brodsky, Krishna Rajagopal
|
Disentangling Jet Modification in Jet Simulations and in Z+Jet Data
|
16 pages, 8 figures
| null |
10.1007/JHEP02(2022)175
|
CERN-TH-2021-163, MIT-CTP/5344
|
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the impact of selection biases on jet structure and substructure
observables and separate these effects from effects caused by jet quenching. We
use the angular separation $\Delta R$ of the hardest splitting in a jet as the
primary example observable. We first conduct a simplified Monte Carlo study in
which it is possible to identify the same jet after quenching in a heavy ion
collision and as it would have been if it had formed in vacuum. We select a
sample of jets by placing a cut on their quenched $p_T$ and, as is possible
only in a Monte Carlo study, compare to the same jets unquenched, and see that
the $\Delta R$ distribution seems to be unmodified. However, if we select a
sample of jets formed in vacuum by placing a cut on their unquenched $p_T$ and
compare to those same jets after quenching, we see a significant enhancement in
the number of jets with large $\Delta R$, primarily due to the soft particles
in the jet that originate from the wake in the droplet of quark-gluon plasma
excited by the parton shower. We confirm that the jets contributing to this
enhancement are those jets which lost the most energy, which were not included
in the sample selected after quenching; jets selected after quenching are those
which lose a small fraction of their energy. Next, we employ a method that is
available to experimentalists: in a sample of jets with a recoiling $Z$ boson,
we show that selecting jets based on the jet $p_T$ after quenching yields a
$\Delta R$ distribution that appears unmodified while selecting a sample of
jets produced in association with a $Z$ boson whose (unmodified) $p_T$ is above
some cut yields a significant enhancement in the number of jets with large
$\Delta R$. We again confirm that this is due to particles from the wake, and
that the jets contributing to this enhancement are those which have lost a
significant fraction of their energy.
|
[
{
"created": "Mon, 25 Oct 2021 18:00:02 GMT",
"version": "v1"
}
] |
2022-03-09
|
[
[
"Brewer",
"Jasmine",
""
],
[
"Brodsky",
"Quinn",
""
],
[
"Rajagopal",
"Krishna",
""
]
] |
We study the impact of selection biases on jet structure and substructure observables and separate these effects from effects caused by jet quenching. We use the angular separation $\Delta R$ of the hardest splitting in a jet as the primary example observable. We first conduct a simplified Monte Carlo study in which it is possible to identify the same jet after quenching in a heavy ion collision and as it would have been if it had formed in vacuum. We select a sample of jets by placing a cut on their quenched $p_T$ and, as is possible only in a Monte Carlo study, compare to the same jets unquenched, and see that the $\Delta R$ distribution seems to be unmodified. However, if we select a sample of jets formed in vacuum by placing a cut on their unquenched $p_T$ and compare to those same jets after quenching, we see a significant enhancement in the number of jets with large $\Delta R$, primarily due to the soft particles in the jet that originate from the wake in the droplet of quark-gluon plasma excited by the parton shower. We confirm that the jets contributing to this enhancement are those jets which lost the most energy, which were not included in the sample selected after quenching; jets selected after quenching are those which lose a small fraction of their energy. Next, we employ a method that is available to experimentalists: in a sample of jets with a recoiling $Z$ boson, we show that selecting jets based on the jet $p_T$ after quenching yields a $\Delta R$ distribution that appears unmodified while selecting a sample of jets produced in association with a $Z$ boson whose (unmodified) $p_T$ is above some cut yields a significant enhancement in the number of jets with large $\Delta R$. We again confirm that this is due to particles from the wake, and that the jets contributing to this enhancement are those which have lost a significant fraction of their energy.
|
1611.07334
|
Wei-Hong Liang
|
Wei-Hong Liang, Eulogio Oset, Zhu-Sheng Xie
|
Semileptonic $\Lambda_b \to \bar \nu_l l \Lambda_c(2595)$ and $\Lambda_b
\to \bar \nu_l l \Lambda_c(2625)$ decays in the molecular picture of
$\Lambda_c(2595)$ and $\Lambda_c(2625)$
|
7 pages, 3 figures
|
Phys. Rev. D 95, 014015 (2017)
|
10.1103/PhysRevD.95.014015
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We evaluate the partial decay widths for the semileptonic $\Lambda_b \to \bar
\nu_l l \Lambda_c(2595)$ and $\Lambda_b \to \bar \nu_l l \Lambda_c(2625)$
decays from the perspective that these two $\Lambda^*_c$ resonances are
dynamically generated from the $DN$ and $D^*N$ interaction with coupled
channels. We find that the ratio of the rates obtained for these two reactions
is compatible with present experimental data and is very sensitive to the $D^*
N$ coupling, which becomes essential to obtain agreement with experiment.
Together with the results obtained for the $\Lambda_b \to \pi^- \Lambda^*_c$
reactions, it gives strong support to the molecular picture of the two
$\Lambda^*_c$ resonances and the important role of the $D^*N$ component
neglected in prior studies of the $\Lambda_c(2595)$ from the molecular
perspective.
|
[
{
"created": "Tue, 22 Nov 2016 14:52:48 GMT",
"version": "v1"
}
] |
2017-01-25
|
[
[
"Liang",
"Wei-Hong",
""
],
[
"Oset",
"Eulogio",
""
],
[
"Xie",
"Zhu-Sheng",
""
]
] |
We evaluate the partial decay widths for the semileptonic $\Lambda_b \to \bar \nu_l l \Lambda_c(2595)$ and $\Lambda_b \to \bar \nu_l l \Lambda_c(2625)$ decays from the perspective that these two $\Lambda^*_c$ resonances are dynamically generated from the $DN$ and $D^*N$ interaction with coupled channels. We find that the ratio of the rates obtained for these two reactions is compatible with present experimental data and is very sensitive to the $D^* N$ coupling, which becomes essential to obtain agreement with experiment. Together with the results obtained for the $\Lambda_b \to \pi^- \Lambda^*_c$ reactions, it gives strong support to the molecular picture of the two $\Lambda^*_c$ resonances and the important role of the $D^*N$ component neglected in prior studies of the $\Lambda_c(2595)$ from the molecular perspective.
|
hep-ph/9611307
| null |
Torben Hannah
|
Unitarity, Chiral Perturbation Theory, and Meson Form Factors
|
15 pages, 5 figs, uses REVTeX and epsfig.sty
|
Phys.Rev.D54:4648-4653,1996
|
10.1103/PhysRevD.54.4648
|
IFA-96/40
|
hep-ph
| null |
The inverse-amplitude method is applied to the one-loop chiral expansion of
the pion, kaon, and $K_{l3}$ form factors. Since these form factors are
determined by the same chiral low-energy constants, it is possible to obtain
finite predictions for the inverse-amplitude method. It is shown that this
method clearly improves one-loop chiral perturbation theory, and a very good
agreement between the inverse-amplitude method and the experimental information
is obtained. This suggests that the inverse-amplitude method is a rather
systematic way of improving chiral perturbation theory.
|
[
{
"created": "Tue, 12 Nov 1996 20:31:33 GMT",
"version": "v1"
}
] |
2014-11-17
|
[
[
"Hannah",
"Torben",
""
]
] |
The inverse-amplitude method is applied to the one-loop chiral expansion of the pion, kaon, and $K_{l3}$ form factors. Since these form factors are determined by the same chiral low-energy constants, it is possible to obtain finite predictions for the inverse-amplitude method. It is shown that this method clearly improves one-loop chiral perturbation theory, and a very good agreement between the inverse-amplitude method and the experimental information is obtained. This suggests that the inverse-amplitude method is a rather systematic way of improving chiral perturbation theory.
|
1408.4605
|
Daniel Busbridge
|
Daniel Busbridge
|
Constrained Dirac gluino mediation
|
29 pages plus appendices, 31 figures, 5 tables, references added,
typos corrected
| null | null |
IPPP/14/23, DCPT/14/46
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We perform a comparison study of the Constrained Minimal Supersymmetric
Standard Model and Constrained General Gauge Mediation with and without a heavy
Dirac gluino. These extremely simple models have very few free parameters and
exhibit the characteristic features of supersoftness and supersafeness. We
determine the characteristic low energy spectra, the production cross sections
of key processes at the Large Hadron Collider and the degree of fine tuning for
a representative range of parameters for each model.
|
[
{
"created": "Wed, 20 Aug 2014 11:00:55 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Aug 2014 12:09:34 GMT",
"version": "v2"
}
] |
2014-08-28
|
[
[
"Busbridge",
"Daniel",
""
]
] |
We perform a comparison study of the Constrained Minimal Supersymmetric Standard Model and Constrained General Gauge Mediation with and without a heavy Dirac gluino. These extremely simple models have very few free parameters and exhibit the characteristic features of supersoftness and supersafeness. We determine the characteristic low energy spectra, the production cross sections of key processes at the Large Hadron Collider and the degree of fine tuning for a representative range of parameters for each model.
|
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