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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1110.5471
|
Oleg Kharlanov
|
S. S. Aleshin, O. G. Kharlanov, and A. E. Lobanov
|
Does the Borexino experiment have enough resolution to detect the
neutrino flavor day-night asymmetry?
|
16 pages, 3 figures; Talk given at the 17th International Seminar on
High Energy Physics "QUARKS'2012" (Yaroslavl, Russia, June 4-10, 2012); to
appear in the Proceedings volume
| null |
10.1103/PhysRevD.87.045025
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The Earth's density distribution can be approximately considered piecewise
continuous at the scale of two-flavor oscillations of neutrinos with energies
about 1 MeV. This quite general assumption appears to be enough to analytically
calculate the day-night asymmetry factor. Using the explicit time averaging
procedure, we show that, within the leading-order approximation, this factor is
determined by the electron density immediately before the detector, i.e. in the
Earth's crust. Within the approximation chosen, the resulting asymmetry factor
does not depend either on the properties of the inner Earth's layers or on the
substance and the dimensions of the detector. For beryllium neutrinos, we
arrive at the asymmetry factor estimation of about $-4 \times 10^{-4}$, which
is at least one order of magnitude beyond the present experimental resolution,
including that of the Borexino experiment.
|
[
{
"created": "Tue, 25 Oct 2011 11:34:26 GMT",
"version": "v1"
},
{
"created": "Sat, 12 May 2012 12:20:02 GMT",
"version": "v2"
},
{
"created": "Thu, 28 Feb 2013 11:35:42 GMT",
"version": "v3"
}
] |
2013-03-14
|
[
[
"Aleshin",
"S. S.",
""
],
[
"Kharlanov",
"O. G.",
""
],
[
"Lobanov",
"A. E.",
""
]
] |
The Earth's density distribution can be approximately considered piecewise continuous at the scale of two-flavor oscillations of neutrinos with energies about 1 MeV. This quite general assumption appears to be enough to analytically calculate the day-night asymmetry factor. Using the explicit time averaging procedure, we show that, within the leading-order approximation, this factor is determined by the electron density immediately before the detector, i.e. in the Earth's crust. Within the approximation chosen, the resulting asymmetry factor does not depend either on the properties of the inner Earth's layers or on the substance and the dimensions of the detector. For beryllium neutrinos, we arrive at the asymmetry factor estimation of about $-4 \times 10^{-4}$, which is at least one order of magnitude beyond the present experimental resolution, including that of the Borexino experiment.
|
1003.0289
|
Sannino Francesco
|
Francesco Sannino (CP3-Origins)
|
Phase Diagrams of Strongly Interacting Theories
|
Contribution prepared for the proceedings for the SCGT09 meeting. 17
pages
|
Int.J.Mod.Phys.A25:5145-5161,2010
|
10.1142/S0217751X10050925
|
CP3-Origins:2010-7
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We summarize the phase diagrams of SU, SO and Sp gauge theories as function
of the number of flavors, colors, and matter representation as well as the ones
of phenomenologically relevant chiral gauge theories such as the
Bars-Yankielowicz and the generalized Georgi-Glashow models. We finally report
on the intriguing possibility of the existence of gauge-duals for
nonsupersymmetric gauge theories and the impact on their conformal window.
|
[
{
"created": "Mon, 1 Mar 2010 10:17:04 GMT",
"version": "v1"
}
] |
2010-12-09
|
[
[
"Sannino",
"Francesco",
"",
"CP3-Origins"
]
] |
We summarize the phase diagrams of SU, SO and Sp gauge theories as function of the number of flavors, colors, and matter representation as well as the ones of phenomenologically relevant chiral gauge theories such as the Bars-Yankielowicz and the generalized Georgi-Glashow models. We finally report on the intriguing possibility of the existence of gauge-duals for nonsupersymmetric gauge theories and the impact on their conformal window.
|
hep-ph/0105005
|
Tomas Blazek
|
T.Blazek and S.F.King
|
Muon Anomalous Magnetic Moment and $\tau \to \mu \gamma$ in a Realistic
String-Inspired Model of Neutrino Masses
|
16 pages, 3 figures
|
Phys.Lett.B518:109-116,2001
|
10.1016/S0370-2693(01)00860-7
| null |
hep-ph
| null |
We discuss the lepton sector of a realistic string-inspired model based on
the Pati-Salam $SU(4)\times SU(2)_L \times SU(2)_R$ gauge group supplemented by
a U(1) family symmetry. The model involves third family Yukawa unification,
predicts large $\tan \beta\sim 50$, and describes all fermion masses and mixing
angles, including approximate bi-maximal mixing in the neutrino sector.
Atmospheric neutrino mixing is achieved via a large 23 entry in the neutrino
Yukawa matrix which can have important phenomenological effects. We find that
the recent BNL result on the muon ($g-2$) can be easily accommodated in a large
portion of the SUSY parameter space of this model. Over this region of
parameter space the model predicts a CP-even Higgs mass near 115 GeV, and a
rate for $\tau\to \mu\gamma$ which is close to its current experimental limit.
|
[
{
"created": "Tue, 1 May 2001 18:49:12 GMT",
"version": "v1"
},
{
"created": "Wed, 2 May 2001 19:10:32 GMT",
"version": "v2"
},
{
"created": "Wed, 23 May 2001 14:47:57 GMT",
"version": "v3"
}
] |
2011-03-23
|
[
[
"Blazek",
"T.",
""
],
[
"King",
"S. F.",
""
]
] |
We discuss the lepton sector of a realistic string-inspired model based on the Pati-Salam $SU(4)\times SU(2)_L \times SU(2)_R$ gauge group supplemented by a U(1) family symmetry. The model involves third family Yukawa unification, predicts large $\tan \beta\sim 50$, and describes all fermion masses and mixing angles, including approximate bi-maximal mixing in the neutrino sector. Atmospheric neutrino mixing is achieved via a large 23 entry in the neutrino Yukawa matrix which can have important phenomenological effects. We find that the recent BNL result on the muon ($g-2$) can be easily accommodated in a large portion of the SUSY parameter space of this model. Over this region of parameter space the model predicts a CP-even Higgs mass near 115 GeV, and a rate for $\tau\to \mu\gamma$ which is close to its current experimental limit.
|
hep-ph/0412304
|
Graciela B. Gelmini
|
Graciela B. Gelmini
|
Cosmology of "Visible" Sterile Neutrinos
|
Talk given at the ``8th Workshop on Non-Perturbative Quantum
Chromodynamics", June 7-11, 2004, Paris, France; 7 pages, 2 figures
|
Int.J.Mod.Phys. A20 (2005) 4670-4675
|
10.1142/S0217751X05028363
|
UCLA/04/TEP/52
|
hep-ph
| null |
We point out that in scenarios with a low reheating temperature $T_R << 100$
MeV at the end of (the last episode of) inflation or entropy production, the
abundance of sterile neutrinos becomes largely independent of their coupling to
active neutrinos. Thus, cosmological bounds become less stringent than usually
assumed, allowing sterile neutrinos to be ``visible'' in future experiments.
For example, the sterile neutrino required by the LSND result does not have any
cosmological problem within these scenarios.
|
[
{
"created": "Tue, 21 Dec 2004 04:54:14 GMT",
"version": "v1"
}
] |
2009-11-10
|
[
[
"Gelmini",
"Graciela B.",
""
]
] |
We point out that in scenarios with a low reheating temperature $T_R << 100$ MeV at the end of (the last episode of) inflation or entropy production, the abundance of sterile neutrinos becomes largely independent of their coupling to active neutrinos. Thus, cosmological bounds become less stringent than usually assumed, allowing sterile neutrinos to be ``visible'' in future experiments. For example, the sterile neutrino required by the LSND result does not have any cosmological problem within these scenarios.
|
1805.06378
|
Danny van Dyk
|
Marcin Chrzaszcz, Andrea Mauri, Nicola Serra, Rafael Silva Coutinho,
Danny van Dyk
|
Prospects for disentangling long- and short-distance effects in the
decays $B\to K^* \mu^+\mu^-$
|
14 pages, 7 figures
| null |
10.1007/JHEP10(2019)236
|
TUM-HEP-1108/17, ZU-TH 25/17
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Theory uncertainties on non-local hadronic effects limit the New Physics
discovery potential of the rare decays $B\to K^*\mu^+\mu^-$. We investigate
prospects to disentangle New Physics effects in the short-distance coefficients
from these effects. Our approach makes use of an event-by-event amplitude
analysis, and relies on the state of the art parametrisation of the non-local
contributions. We find that non-standard effects in the short-distance
coefficients can be successfully disentangled from non-local hadronic effects.
The impact of the truncation on the parametrisation of non-local contributions
to the Wilson coefficients are for the first time systematically examined and
prospects for its precise determination are discussed. We find that physical
observables are unaffected by these uncertainties. Compared to other methods,
our approach provides for a more precise extraction of the angular observables
from data.
|
[
{
"created": "Wed, 16 May 2018 15:48:05 GMT",
"version": "v1"
}
] |
2020-01-08
|
[
[
"Chrzaszcz",
"Marcin",
""
],
[
"Mauri",
"Andrea",
""
],
[
"Serra",
"Nicola",
""
],
[
"Coutinho",
"Rafael Silva",
""
],
[
"van Dyk",
"Danny",
""
]
] |
Theory uncertainties on non-local hadronic effects limit the New Physics discovery potential of the rare decays $B\to K^*\mu^+\mu^-$. We investigate prospects to disentangle New Physics effects in the short-distance coefficients from these effects. Our approach makes use of an event-by-event amplitude analysis, and relies on the state of the art parametrisation of the non-local contributions. We find that non-standard effects in the short-distance coefficients can be successfully disentangled from non-local hadronic effects. The impact of the truncation on the parametrisation of non-local contributions to the Wilson coefficients are for the first time systematically examined and prospects for its precise determination are discussed. We find that physical observables are unaffected by these uncertainties. Compared to other methods, our approach provides for a more precise extraction of the angular observables from data.
|
hep-ph/0402032
|
Thomas Schaefer
|
Thomas Schaefer (North Carolina State University and Riken-BNL
Research Center)
|
Effective Theory of Superfluid Quark Matter
|
15 pages, to appear in the proceedings of the KIAS-APCTP Symposium on
Astro-Hadron Physics "Compact Stars: Quest for New States of Dense Matter",
World Scientific, in press
| null |
10.1142/9789812702524_0026
| null |
hep-ph
| null |
We provide a brief introduction to the high density effective theory of QCD.
As an application, we consider the instanton correction to the perturbatively
generated gap in the color superconducting phase. We show that the instanton
correction becomes large for mu = 1.25 GeV in N_f=2 QCD, and for mu = 750 MeV
in N_f=3 QCD with a massive strange quark. We also study some other numerical
issues related to the magnitude of the gap. We find, in particular, that a
renormalization group improved gap equation does not give results that are
substantially different from a gap equation with a fixed coupling.
|
[
{
"created": "Tue, 3 Feb 2004 17:41:09 GMT",
"version": "v1"
}
] |
2017-08-23
|
[
[
"Schaefer",
"Thomas",
"",
"North Carolina State University and Riken-BNL\n Research Center"
]
] |
We provide a brief introduction to the high density effective theory of QCD. As an application, we consider the instanton correction to the perturbatively generated gap in the color superconducting phase. We show that the instanton correction becomes large for mu = 1.25 GeV in N_f=2 QCD, and for mu = 750 MeV in N_f=3 QCD with a massive strange quark. We also study some other numerical issues related to the magnitude of the gap. We find, in particular, that a renormalization group improved gap equation does not give results that are substantially different from a gap equation with a fixed coupling.
|
hep-ph/9502374
| null |
P. Colangelo, C.A. Dominguez and N. Paver,
|
TESTS OF FACTORIZATION IN COLOR SUPPRESSED NONLEPTONIC B DECAY MODES,
|
LaTex, 20 pages, 6 figures (not included, available upon request)
|
Phys.Lett. B352 (1995) 134-143
|
10.1016/0370-2693(95)00459-X
|
BARI-TH/95-191, UCT-TP-222/95
|
hep-ph
| null |
We propose a number of tests of factorization for the color-suppressed
nonleptonic decay channels: $B \to K^{(*)} \; \eta_c$ and $B \to K^{(*)} \;
\eta^\prime_c$. The relevant leptonic constants and form factors are calculated
within the QCD sum rules approach.
|
[
{
"created": "Thu, 23 Feb 1995 09:45:51 GMT",
"version": "v1"
}
] |
2016-09-01
|
[
[
"Colangelo",
"P.",
""
],
[
"Dominguez",
"C. A.",
""
],
[
"Paver",
"N.",
""
]
] |
We propose a number of tests of factorization for the color-suppressed nonleptonic decay channels: $B \to K^{(*)} \; \eta_c$ and $B \to K^{(*)} \; \eta^\prime_c$. The relevant leptonic constants and form factors are calculated within the QCD sum rules approach.
|
hep-ph/0510257
|
Heather E. Logan
|
Vernon Barger, Wai-Yee Keung, Heather E. Logan, Gabe Shaughnessy, and
Adam Tregre
|
Neutralino annihilation beyond leading order
|
17 pages, 7 figures. v2: added refs and discussion of present-day
neutralino annihilation. v3: PLB version
|
Phys.Lett.B633:98-105,2006
|
10.1016/j.physletb.2005.11.062
|
MADPH-05-1443
|
hep-ph
| null |
High-precision measurements of the relic dark matter density and the
calculation of dark matter annihilation branching fractions in the sun or the
galactic halo today motivate the computation of the neutralino annihilation
cross section beyond leading order. We consider neutralino annihilation via
squark exchange and parameterize the effective annihilation vertex as a
dimension-six operator suppressed by two powers of the squark mass and related
to the divergence of the axial vector current of the final-state quarks. Since
the axial vector current is conserved at tree level in the limit of massless
quarks, this dimension-six operator contains a suppression by the quark mass.
The quark mass suppression can be lifted in two ways: (1) by corrections to the
dimension-six operator involving the anomalous triangle diagram, and (2) by
going to dimension-eight. We address the first of these possibilities by
evaluating the anomalous triangle diagram, which contributes to neutralino
annihilation to gluon pairs. We relate the triangle diagram via the anomaly
equation to the decay of a pseudoscalar into two gluons and use the
Adler-Bardeen theorem to extract the next-to-leading order (NLO) QCD
corrections to chi chi --> gg from the known corrections to pseudoscalar decay.
The strong dependence of the dominant chi chi --> q qbar cross section on the
relative velocity of the neutralinos makes these NLO corrections unimportant at
chi decoupling but significant today.
|
[
{
"created": "Wed, 19 Oct 2005 20:02:02 GMT",
"version": "v1"
},
{
"created": "Mon, 31 Oct 2005 18:28:23 GMT",
"version": "v2"
},
{
"created": "Fri, 18 Nov 2005 20:12:34 GMT",
"version": "v3"
}
] |
2009-09-01
|
[
[
"Barger",
"Vernon",
""
],
[
"Keung",
"Wai-Yee",
""
],
[
"Logan",
"Heather E.",
""
],
[
"Shaughnessy",
"Gabe",
""
],
[
"Tregre",
"Adam",
""
]
] |
High-precision measurements of the relic dark matter density and the calculation of dark matter annihilation branching fractions in the sun or the galactic halo today motivate the computation of the neutralino annihilation cross section beyond leading order. We consider neutralino annihilation via squark exchange and parameterize the effective annihilation vertex as a dimension-six operator suppressed by two powers of the squark mass and related to the divergence of the axial vector current of the final-state quarks. Since the axial vector current is conserved at tree level in the limit of massless quarks, this dimension-six operator contains a suppression by the quark mass. The quark mass suppression can be lifted in two ways: (1) by corrections to the dimension-six operator involving the anomalous triangle diagram, and (2) by going to dimension-eight. We address the first of these possibilities by evaluating the anomalous triangle diagram, which contributes to neutralino annihilation to gluon pairs. We relate the triangle diagram via the anomaly equation to the decay of a pseudoscalar into two gluons and use the Adler-Bardeen theorem to extract the next-to-leading order (NLO) QCD corrections to chi chi --> gg from the known corrections to pseudoscalar decay. The strong dependence of the dominant chi chi --> q qbar cross section on the relative velocity of the neutralinos makes these NLO corrections unimportant at chi decoupling but significant today.
|
0805.2799
|
Eugene Levin
|
E. Gotsman, E. Levin, U.Maor and J.S.Miller (Tel Aviv Un.)
|
A QCD motivated model for soft interactions at high energies
|
33pp,20 figures in eps files
|
Eur.Phys.J.C57:689-709,2008
|
10.1140/epjc/s10052-008-0704-5
|
TAUP -2878-08
|
hep-ph
|
http://creativecommons.org/licenses/by/3.0/
|
In this paper we develop an approach to soft scattering processes at high
energies,which is based on two mechanisms: Good-Walker mechanism for low mass
diffractionand multi-Pomeron interactions for high mass diffraction. The
pricipal idea, that allows us to specify the theory for Pomeron interactions,
is that the so called soft processes occur at rather short distances
($r^2 \propto 1 /<p_t>^2 \propto \alpha'_\pom \approx 0.01 GeV^{-2}$), where
perturbative QCD is valid. The value of the Pomeron slope $\alpha'_\pom $ was
obtained from the fit to experimental data. Using this theoretical approach we
suggest a model that fits all soft data in the ISR-Tevatron energy range, the
total, elastic, single and double diffractive cross sections, including $t$
dependence of the differential elastic cross section, and the mass dependence
of single diffraction. In this model we calculate the survival probability of
diffractive Higgs production, and obtained a value for this observable, which
is smaller than 1% at the LHC energy range.
|
[
{
"created": "Mon, 19 May 2008 07:13:30 GMT",
"version": "v1"
},
{
"created": "Sun, 25 May 2008 08:34:10 GMT",
"version": "v2"
}
] |
2008-12-18
|
[
[
"Gotsman",
"E.",
"",
"Tel Aviv Un."
],
[
"Levin",
"E.",
"",
"Tel Aviv Un."
],
[
"Maor",
"U.",
"",
"Tel Aviv Un."
],
[
"Miller",
"J. S.",
"",
"Tel Aviv Un."
]
] |
In this paper we develop an approach to soft scattering processes at high energies,which is based on two mechanisms: Good-Walker mechanism for low mass diffractionand multi-Pomeron interactions for high mass diffraction. The pricipal idea, that allows us to specify the theory for Pomeron interactions, is that the so called soft processes occur at rather short distances ($r^2 \propto 1 /<p_t>^2 \propto \alpha'_\pom \approx 0.01 GeV^{-2}$), where perturbative QCD is valid. The value of the Pomeron slope $\alpha'_\pom $ was obtained from the fit to experimental data. Using this theoretical approach we suggest a model that fits all soft data in the ISR-Tevatron energy range, the total, elastic, single and double diffractive cross sections, including $t$ dependence of the differential elastic cross section, and the mass dependence of single diffraction. In this model we calculate the survival probability of diffractive Higgs production, and obtained a value for this observable, which is smaller than 1% at the LHC energy range.
|
hep-ph/9809368
|
Carlo Giunti
|
S.M. Bilenky, C. Giunti, W. Grimus
|
On the neutrino mass spectrum and neutrino mixing from oscillation data
|
7 pages. Talk presented by S.M. Bilenky at Neutrino '98, Takayama,
Japan, June 1998
| null |
10.1016/S0920-5632(99)00411-9
|
TUM-HEP-327/98, SFB 375-307, UWThPh-1998-50, DFTT 52/98
|
hep-ph
| null |
Two schemes of mixing of four massive neutrinos with two couples of close
neutrino masses separated by a gap of the order of 1 eV can accommodate solar,
atmospheric and LSND neutrino oscillation data. It is shown that long-baseline
nu(e)->nu(e) and nu(mu)->nu(e) transitions are strongly suppressed in these
schemes. The scheme of mixing of three neutrino masses with a mass hierarchy
that can describe solar and atmospheric neutrino data is also discussed. It is
shown that in this scheme the effective Majorana mass |<m>| that characterizes
the matrix element of neutrinoless double-beta decay is less than 10^{-2} eV.
|
[
{
"created": "Mon, 14 Sep 1998 09:54:33 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Bilenky",
"S. M.",
""
],
[
"Giunti",
"C.",
""
],
[
"Grimus",
"W.",
""
]
] |
Two schemes of mixing of four massive neutrinos with two couples of close neutrino masses separated by a gap of the order of 1 eV can accommodate solar, atmospheric and LSND neutrino oscillation data. It is shown that long-baseline nu(e)->nu(e) and nu(mu)->nu(e) transitions are strongly suppressed in these schemes. The scheme of mixing of three neutrino masses with a mass hierarchy that can describe solar and atmospheric neutrino data is also discussed. It is shown that in this scheme the effective Majorana mass |<m>| that characterizes the matrix element of neutrinoless double-beta decay is less than 10^{-2} eV.
|
hep-ph/0402121
|
Stefan Antusch
|
Stefan Antusch, Steve F. King
|
From Hierarchical to Partially Degenerate Neutrinos via Type II Upgrade
of Type I See-Saw Models
|
35 pages, 10 figures; minor corrections; version published in Nucl.
Phys. B
|
Nucl.Phys. B705 (2005) 239-268
|
10.1016/j.nuclphysb.2004.10.049
|
SHEP/0403
|
hep-ph
| null |
We propose a type II upgrade of type I see-saw models leading to new classes
of models where partially degenerate neutrinos are as natural as hierarchical
ones. The additional type II contribution to the neutrino mass matrix, which
determines the neutrino mass scale, is forced to be proportional to the unit
matrix by a SO(3) flavour symmetry. The type I see-saw part of the neutrino
mass matrix, which controls the mass squared differences and mixing angles, may
be governed by sequential right-handed neutrino dominance and a natural
alignment for the SO(3)-breaking vacuum. We focus on classes of models with
bi-large mixing originating from the neutrino mass matrix although we also
briefly discuss other classes of models where large mixing stems from the
charged lepton mass matrix. We study renormalization group corrections to the
neutrino mass squared differences and mixings and find that the low energy
values do not depend sensitively on the high energy values for partially
degenerate neutrinos with a mass scale up to about 0.15 eV. Our scenario
predicts the effective mass for neutrinoless double beta decay to be
approximately equal to the neutrino mass scale and therefore neutrinoless
double beta decay will be observable if the neutrino mass spectrum is partially
degenerate. We also find that all observable CP phases as well as $\theta_{13}$
become small as the neutrino mass scale increases.
|
[
{
"created": "Wed, 11 Feb 2004 17:51:20 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Mar 2004 15:27:46 GMT",
"version": "v2"
},
{
"created": "Wed, 30 Mar 2005 09:43:29 GMT",
"version": "v3"
}
] |
2010-04-05
|
[
[
"Antusch",
"Stefan",
""
],
[
"King",
"Steve F.",
""
]
] |
We propose a type II upgrade of type I see-saw models leading to new classes of models where partially degenerate neutrinos are as natural as hierarchical ones. The additional type II contribution to the neutrino mass matrix, which determines the neutrino mass scale, is forced to be proportional to the unit matrix by a SO(3) flavour symmetry. The type I see-saw part of the neutrino mass matrix, which controls the mass squared differences and mixing angles, may be governed by sequential right-handed neutrino dominance and a natural alignment for the SO(3)-breaking vacuum. We focus on classes of models with bi-large mixing originating from the neutrino mass matrix although we also briefly discuss other classes of models where large mixing stems from the charged lepton mass matrix. We study renormalization group corrections to the neutrino mass squared differences and mixings and find that the low energy values do not depend sensitively on the high energy values for partially degenerate neutrinos with a mass scale up to about 0.15 eV. Our scenario predicts the effective mass for neutrinoless double beta decay to be approximately equal to the neutrino mass scale and therefore neutrinoless double beta decay will be observable if the neutrino mass spectrum is partially degenerate. We also find that all observable CP phases as well as $\theta_{13}$ become small as the neutrino mass scale increases.
|
hep-ph/9909438
|
Wojciech Broniowski
|
Wojciech Broniowski (INP, Cracow)
|
Gauging non-local quark models
|
13 pages, talk presented at Hadrons as Solitons, Bled, Slovenia, 6-17
July 1999
| null | null |
INP 1828/PH
|
hep-ph
| null |
Gauging of effective chiral quark models with non-local regulators is
discussed in the context of solitons. In particular, we show that with the
P-exponent method the current algebra is satisfied and the charges are properly
quantized.
|
[
{
"created": "Mon, 20 Sep 1999 16:23:45 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Sep 1999 08:31:30 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Broniowski",
"Wojciech",
"",
"INP, Cracow"
]
] |
Gauging of effective chiral quark models with non-local regulators is discussed in the context of solitons. In particular, we show that with the P-exponent method the current algebra is satisfied and the charges are properly quantized.
|
hep-ph/0205177
|
Michal Praszalowicz
|
Michal Praszalowicz and Andrzej Rostworowski
|
Pion Generalized Parton Distributions in the Non-Local NJL Model
|
4 pages, 3 figures, uses mp.sty, talk presented at the XXXVIIth
Rencontres de Moriond `QCD and high energy hadronic interactions', Les Arcs,
France; v2: one acknowledgement added
| null | null |
TPJU-10/2002
|
hep-ph
| null |
We calculate skewed parton distributions $H^I$ of a pion within a non-local
NJL model with momentum dependent constituent quark mass $M(k)$. In the forward
limit $H^I$ correspond to parton distributions, whereas for $t<0$, $H^I$ is
related to the pion electromagnetic form-factor
|
[
{
"created": "Thu, 16 May 2002 07:35:11 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Feb 2003 14:05:57 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Praszalowicz",
"Michal",
""
],
[
"Rostworowski",
"Andrzej",
""
]
] |
We calculate skewed parton distributions $H^I$ of a pion within a non-local NJL model with momentum dependent constituent quark mass $M(k)$. In the forward limit $H^I$ correspond to parton distributions, whereas for $t<0$, $H^I$ is related to the pion electromagnetic form-factor
|
hep-ph/0606205
|
Joe Polchinski
|
Joseph Polchinski and Jorge V. Rocha
|
Analytic Study of Small Scale Structure on Cosmic Strings
|
28 pages, 4 figures. v3: various small clarifications in calculations
(secs. 2 and 4) v4: ref. added
|
Phys.Rev.D74:083504,2006
|
10.1103/PhysRevD.74.083504
| null |
hep-ph astro-ph gr-qc hep-th
| null |
The properties of string networks at scales well below the horizon are poorly
understood, but they enter critically into many observables. We argue that in
some regimes, stretching will be the only relevant process governing the
evolution. In this case, the string two-point function is determined up to
normalization: the fractal dimension approaches one at short distance, but the
rate of approach is characterized by an exponent that plays an essential role
in network properties. The smoothness at short distance implies, for example,
that cosmic string lensing images are little distorted. We then add in loop
production as a perturbation and find that it diverges at small scales. This
need not invalidate the stretching model, since the loop production occurs in
localized regions, but it implies a complicated fragmentation process. Our
ability to model this process is limited, but we argue that loop production
peaks a few orders of magnitude below the horizon scale, without the inclusion
of gravitational radiation. We find agreement with some features of
simulations, and interesting discrepancies that must be resolved by future
work.
|
[
{
"created": "Mon, 19 Jun 2006 17:58:00 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Jun 2006 21:57:44 GMT",
"version": "v2"
},
{
"created": "Thu, 31 Aug 2006 19:50:50 GMT",
"version": "v3"
},
{
"created": "Wed, 7 Nov 2007 01:57:51 GMT",
"version": "v4"
}
] |
2008-11-26
|
[
[
"Polchinski",
"Joseph",
""
],
[
"Rocha",
"Jorge V.",
""
]
] |
The properties of string networks at scales well below the horizon are poorly understood, but they enter critically into many observables. We argue that in some regimes, stretching will be the only relevant process governing the evolution. In this case, the string two-point function is determined up to normalization: the fractal dimension approaches one at short distance, but the rate of approach is characterized by an exponent that plays an essential role in network properties. The smoothness at short distance implies, for example, that cosmic string lensing images are little distorted. We then add in loop production as a perturbation and find that it diverges at small scales. This need not invalidate the stretching model, since the loop production occurs in localized regions, but it implies a complicated fragmentation process. Our ability to model this process is limited, but we argue that loop production peaks a few orders of magnitude below the horizon scale, without the inclusion of gravitational radiation. We find agreement with some features of simulations, and interesting discrepancies that must be resolved by future work.
|
hep-ph/0409350
|
Sabine Hossenfelder
|
Sabine Hossenfelder
|
Large Extra Dimensions and the Minimal Length
|
9 Pages, 2 Figures, to appear in the Proceedings of the conference
Physics at LHC, Vienna, Austria, July 2004
|
Czech.J.Phys.55:B809-B817,2005
| null | null |
hep-ph
| null |
Large extra dimensions lower the Planck scale to values soon accessible.
Motivated by String Theory, the models of large extra dimensions predict a vast
number of new effects in the energy range of the lowered Planck scale, among
them the production of TeV-mass black holes and gravitons. But not only is the
Planck scale the energy scale at which effects of modified gravity become
important. String Theory as well as non-commutative quantum mechanics suggest
that the Planck length acts as a minimal length in nature, providing a natural
ultraviolet cutoff and a limit to the possible resolution of spacetime. Within
the extra dimensional scenario, the minimal length effects thus become
important in the same energy range in which the effective extra dimensional
models predict new physics. We examine a model which includes the minimal
length into the extra dimensional extension of the Standard Model.
To appear in the Proceedings of the conference Physics at LHC, Vienna,
Austria, July 2004.
|
[
{
"created": "Wed, 29 Sep 2004 19:57:42 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Sep 2004 20:27:05 GMT",
"version": "v2"
}
] |
2014-11-18
|
[
[
"Hossenfelder",
"Sabine",
""
]
] |
Large extra dimensions lower the Planck scale to values soon accessible. Motivated by String Theory, the models of large extra dimensions predict a vast number of new effects in the energy range of the lowered Planck scale, among them the production of TeV-mass black holes and gravitons. But not only is the Planck scale the energy scale at which effects of modified gravity become important. String Theory as well as non-commutative quantum mechanics suggest that the Planck length acts as a minimal length in nature, providing a natural ultraviolet cutoff and a limit to the possible resolution of spacetime. Within the extra dimensional scenario, the minimal length effects thus become important in the same energy range in which the effective extra dimensional models predict new physics. We examine a model which includes the minimal length into the extra dimensional extension of the Standard Model. To appear in the Proceedings of the conference Physics at LHC, Vienna, Austria, July 2004.
|
hep-ph/0301072
|
A. B. Balantekin
|
A.B. Balantekin and H. Yuksel (Wisconsin U., Madison)
|
Global Analysis of Solar Neutrino and KamLAND Data
|
17 pages of REVTEX, 6 figures; several typos are corrected
|
J.Phys.G29:665-682,2003
|
10.1088/0954-3899/29/4/305
| null |
hep-ph nucl-th
| null |
A global analysis of the data from all the solar neutrino experiments
combined with the recent KamLAND data is presented. A formula frequently used
in the literature gives survival probability for three active solar neutrino
flavors in terms of a suitably-modified two-flavor survival probability.
Corrections to this formula, which depend on $\theta_{13}$ and $\delta
m_{31}^2$, are calculated. For the mass scale suggested by the atmospheric
neutrino experiments the contributions of $\delta m_{31}^2$ to these
corrections is found to be negligible. The role of $\theta_{13}$ in solar
neutrino physics is elaborated. For electron neutrino oscillations into another
active flavor, we find best fit values of $\tan^2 \theta_{12} \sim 0.46$,
$\tan^2 \theta_{13} \sim 0$, and $\delta m_{21}^2 \sim 7.1 \times 10^{-5}$
eV$^2$. It is found that the combined solar neutrino and KamLAND date provide
the limit $\cos^4 \theta_{13} < 0.8$ at the 90 % confidence level.
|
[
{
"created": "Fri, 10 Jan 2003 20:17:38 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Jan 2003 21:58:01 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Balantekin",
"A. B.",
"",
"Wisconsin U., Madison"
],
[
"Yuksel",
"H.",
"",
"Wisconsin U., Madison"
]
] |
A global analysis of the data from all the solar neutrino experiments combined with the recent KamLAND data is presented. A formula frequently used in the literature gives survival probability for three active solar neutrino flavors in terms of a suitably-modified two-flavor survival probability. Corrections to this formula, which depend on $\theta_{13}$ and $\delta m_{31}^2$, are calculated. For the mass scale suggested by the atmospheric neutrino experiments the contributions of $\delta m_{31}^2$ to these corrections is found to be negligible. The role of $\theta_{13}$ in solar neutrino physics is elaborated. For electron neutrino oscillations into another active flavor, we find best fit values of $\tan^2 \theta_{12} \sim 0.46$, $\tan^2 \theta_{13} \sim 0$, and $\delta m_{21}^2 \sim 7.1 \times 10^{-5}$ eV$^2$. It is found that the combined solar neutrino and KamLAND date provide the limit $\cos^4 \theta_{13} < 0.8$ at the 90 % confidence level.
|
1704.02692
|
Hiroyuki Ishida
|
Takehiko Asaka, Shintaro Eijima, Hiroyuki Ishida, Kosuke Minogawa,
Tomoya Yoshii
|
Initial condition for baryogenesis via neutrino oscillation
|
24 pages, 35 figures, v2; correspond to published version
|
Phys. Rev. D 96, 083010 (2017)
|
10.1103/PhysRevD.96.083010
| null |
hep-ph astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider a baryogenesis scenario via the oscillation of right-handed
neutrinos with Majorana masses of the order of GeV, which are also responsible
for neutrino masses by the seesaw mechanism. We study how the initial condition
alters the prediction of the present baryon asymmetry by this mechanism. It is
usually assumed that the abundance of right-handed neutrinos is zero after the
reheating of the inflationary universe and they are produced in scattering
processes by the renomalizable Yukawa interaction. However, the
higher-dimensional operator with right-handed neutrinos may provide an
additional production which is most effective at the reheating epoch. It is
shown that such an initial abundance of right-handed neutrinos can
significantly modify the prediction when the strong washout of the asymmetry is
absent. This leads to the parameter space of the model for the successful
baryogenesis being enlarged.
|
[
{
"created": "Mon, 10 Apr 2017 03:19:47 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Oct 2017 06:23:19 GMT",
"version": "v2"
}
] |
2017-10-27
|
[
[
"Asaka",
"Takehiko",
""
],
[
"Eijima",
"Shintaro",
""
],
[
"Ishida",
"Hiroyuki",
""
],
[
"Minogawa",
"Kosuke",
""
],
[
"Yoshii",
"Tomoya",
""
]
] |
We consider a baryogenesis scenario via the oscillation of right-handed neutrinos with Majorana masses of the order of GeV, which are also responsible for neutrino masses by the seesaw mechanism. We study how the initial condition alters the prediction of the present baryon asymmetry by this mechanism. It is usually assumed that the abundance of right-handed neutrinos is zero after the reheating of the inflationary universe and they are produced in scattering processes by the renomalizable Yukawa interaction. However, the higher-dimensional operator with right-handed neutrinos may provide an additional production which is most effective at the reheating epoch. It is shown that such an initial abundance of right-handed neutrinos can significantly modify the prediction when the strong washout of the asymmetry is absent. This leads to the parameter space of the model for the successful baryogenesis being enlarged.
|
2012.00635
|
Grzegorz Wilk
|
Grzegorz Wilk and Zbigniew W{\l}odarczyk
|
Counting distributions from the perspective of combinants
|
Revisewd version, 3 figures, 16 pages; accepted for publication in
Int. J. Mod. Phys. A
|
Int. J. Mod. Phys. A 36 (13) (2021) 2150072
|
10.1142/S0217751X2150072X
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a comprehensive insight into counting distributions from the
perspective of the combinants extracted from them. In particular, we focus on
cases where these combinants exhibit oscillatory behavior that can provide an
invaluable new source of information about the dynamics of the process under
study. We show that such behavior can be described only by specific
combinations of compound distributions based on the Binomial Distribution and
provide their analytical forms which can be used in further investigations and
which can be helpful in the analysis of all other types of counting
distributions.
|
[
{
"created": "Tue, 1 Dec 2020 16:58:17 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Dec 2020 15:07:24 GMT",
"version": "v2"
},
{
"created": "Tue, 23 Feb 2021 14:30:51 GMT",
"version": "v3"
}
] |
2021-05-26
|
[
[
"Wilk",
"Grzegorz",
""
],
[
"Włodarczyk",
"Zbigniew",
""
]
] |
We present a comprehensive insight into counting distributions from the perspective of the combinants extracted from them. In particular, we focus on cases where these combinants exhibit oscillatory behavior that can provide an invaluable new source of information about the dynamics of the process under study. We show that such behavior can be described only by specific combinations of compound distributions based on the Binomial Distribution and provide their analytical forms which can be used in further investigations and which can be helpful in the analysis of all other types of counting distributions.
|
1906.06116
|
Volodymyr Magas
|
Martin Cleven, Volodymyr K. Magas, Angels Ramos
|
X(3872) in a hot pion bath
|
6 pages, 3 figures
| null |
10.1016/j.physletb.2019.135050
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Right since its discovery in 2003 by the Belle collaboration, establishing
the nature of the $X(3872)$ meson has been one of the main priorities in the
field of quarkonium physics. Not qualifying as a conventional $c\bar{c}$ state,
the multiquark structure of this exotic meson has received very different
interpretations, ranging from a compact tetraquark configuration to an extended
$D\bar D^*+c.c.$ molecule. In this work we explore the effect that a hot pion
bath may have in the properties of the $X(3872)$, assuming this state to be a
$D\bar D^*+c.c.$ molecule. We derive the finite temperature effects on the
$X(3872)$ from a coupled channels unitarized amplitude, obtained including the
properties of the charmed mesons under such conditions. We find that the
$X(3872)$ develops a subtantial width, of the order of a few tens of MeV, in
hot pionic environments at temperatures $100-150$ MeV, and its nominal mass
moves above the $D D^*$ threshold. The fact that the $X(3872)$ in a hot pion
gas may no longer be a narrow resonance needs to be considered in the
estimation of production yields in relativistic heavy-ion collisions.
|
[
{
"created": "Fri, 14 Jun 2019 10:34:25 GMT",
"version": "v1"
}
] |
2019-10-30
|
[
[
"Cleven",
"Martin",
""
],
[
"Magas",
"Volodymyr K.",
""
],
[
"Ramos",
"Angels",
""
]
] |
Right since its discovery in 2003 by the Belle collaboration, establishing the nature of the $X(3872)$ meson has been one of the main priorities in the field of quarkonium physics. Not qualifying as a conventional $c\bar{c}$ state, the multiquark structure of this exotic meson has received very different interpretations, ranging from a compact tetraquark configuration to an extended $D\bar D^*+c.c.$ molecule. In this work we explore the effect that a hot pion bath may have in the properties of the $X(3872)$, assuming this state to be a $D\bar D^*+c.c.$ molecule. We derive the finite temperature effects on the $X(3872)$ from a coupled channels unitarized amplitude, obtained including the properties of the charmed mesons under such conditions. We find that the $X(3872)$ develops a subtantial width, of the order of a few tens of MeV, in hot pionic environments at temperatures $100-150$ MeV, and its nominal mass moves above the $D D^*$ threshold. The fact that the $X(3872)$ in a hot pion gas may no longer be a narrow resonance needs to be considered in the estimation of production yields in relativistic heavy-ion collisions.
|
hep-ph/9907429
|
Sergey Goloskokov
|
S.V.Goloskokov
|
Study of polarized gluon distributions in diffractive reactions at HERA
|
4 pages, latex, 4 figures, to be published in Proc. of the Workshop
"Polarized Protons at High Energies - Accelerator Challenges and Physics
Opportunities", 17-20 May 1999, DESY, Hamburg
| null | null | null |
hep-ph
| null |
We consider the dependencies of spin asymmetries in the diffractive $J/\Psi$
and $Q \bar Q$ leptoproduction at HERA energies on the structure of the
pomeron-proton coupling. It is shown that it is difficult to study the spin
structure of the pomeron coupling with the proton from the $A_{ll}$ asymmetry.
The $A_{lT}$ asymmetry is an appropriate object for this investigation.
|
[
{
"created": "Tue, 20 Jul 1999 13:56:12 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Goloskokov",
"S. V.",
""
]
] |
We consider the dependencies of spin asymmetries in the diffractive $J/\Psi$ and $Q \bar Q$ leptoproduction at HERA energies on the structure of the pomeron-proton coupling. It is shown that it is difficult to study the spin structure of the pomeron coupling with the proton from the $A_{ll}$ asymmetry. The $A_{lT}$ asymmetry is an appropriate object for this investigation.
|
1403.1536
|
Jong-Chul Park
|
Kyoungchul Kong, Jong-Chul Park, Seong Chan Park
|
X-ray line signal from 7 keV axino dark matter decay
|
9 pages, 1 figure; discussion on BICEP2 result and references added,
typos corrected; published in PLB
|
Phys. Lett. B 733 (2014) 217-220
|
10.1016/j.physletb.2014.04.037
| null |
hep-ph astro-ph.CO astro-ph.GA astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Recently a weak X-ray emission around E ~ 3.5 keV was detected in the
Andromeda galaxy and various galaxy clusters including the Perseus galaxy
cluster but its source has been unidentified. Axino, the superpartner of axion,
with a mass 2E is suggested as a possible origin of the line with R-parity
violating decay into photon and neutrino. Moreover, most of parameter space is
consistent with recent observation by the BICEP2 experiment.
|
[
{
"created": "Thu, 6 Mar 2014 19:25:56 GMT",
"version": "v1"
},
{
"created": "Mon, 19 May 2014 17:09:52 GMT",
"version": "v2"
}
] |
2018-01-17
|
[
[
"Kong",
"Kyoungchul",
""
],
[
"Park",
"Jong-Chul",
""
],
[
"Park",
"Seong Chan",
""
]
] |
Recently a weak X-ray emission around E ~ 3.5 keV was detected in the Andromeda galaxy and various galaxy clusters including the Perseus galaxy cluster but its source has been unidentified. Axino, the superpartner of axion, with a mass 2E is suggested as a possible origin of the line with R-parity violating decay into photon and neutrino. Moreover, most of parameter space is consistent with recent observation by the BICEP2 experiment.
|
hep-ph/0010325
|
Sacha Davidson
|
Sacha Davidson, Marta Losada
|
Basis independent neutrino masses in the $R_p$ violating MSSM
|
appendix added about avoiding scale dependent loops; a few sign
changes
|
Phys.Rev. D65 (2002) 075025
|
10.1103/PhysRevD.65.075025
|
OUTP-00-45P
|
hep-ph
| null |
We calculate the neutrino mass matrix up to one loop order in the MSSM
without R-parity, including the bilinears in the mass insertion approximation.
This introduces additional diagrams usually neglected in the literature. We
systematically consider the possible new diagrams, and find a few missing from
our previous work. We provide analytic expressions for the mass matrix elements
in the neutrino flavour basis, which are independent of the $H_d - L_i$ basis
choice in the Lagrangian. We compare the contributions from different diagrams,
and make ``Lagrangian-basis-independent'' estimates of when the new diagrams
need to be included. We briefly discuss the phenomenology of a toy model of
bilinear R-parity violation.
|
[
{
"created": "Fri, 27 Oct 2000 21:55:26 GMT",
"version": "v1"
},
{
"created": "Sun, 11 Mar 2001 17:54:21 GMT",
"version": "v2"
}
] |
2009-10-31
|
[
[
"Davidson",
"Sacha",
""
],
[
"Losada",
"Marta",
""
]
] |
We calculate the neutrino mass matrix up to one loop order in the MSSM without R-parity, including the bilinears in the mass insertion approximation. This introduces additional diagrams usually neglected in the literature. We systematically consider the possible new diagrams, and find a few missing from our previous work. We provide analytic expressions for the mass matrix elements in the neutrino flavour basis, which are independent of the $H_d - L_i$ basis choice in the Lagrangian. We compare the contributions from different diagrams, and make ``Lagrangian-basis-independent'' estimates of when the new diagrams need to be included. We briefly discuss the phenomenology of a toy model of bilinear R-parity violation.
|
0803.1787
|
Yuval Grossman
|
Yuval Grossman, Itay Nachshon
|
Hadronization, spin, and lifetimes
|
Version to appear in JHEP
|
JHEP 0807:016,2008
|
10.1088/1126-6708/2008/07/016
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Measurements of lifetimes can be done in two ways. For very short lived
particles, the width can be measured. For long lived ones, the lifetime can be
directly measured, for example, using a displaced vertex. Practically, the
lifetime cannot be extracted for particles with intermediate lifetimes. We show
that for such cases information about the lifetime can be extracted for heavy
colored particles that can be produced with known polarization. For example, a
$t$-like particle with intermediate lifetime hadronizes into a superposition of
the lowest two hadronic states, $T^*$ and $T$ (the equivalent of $B^*$ and
$B$). Depolarization effects are governed by time scales that are much longer
than the hadronization time scale, $\lqcd^{-1}$. After a time of order
$1/\Delta m$, with $\Delta m \equiv m(T^*)-m(T)$, half of the initial
polarization is lost. The polarization is totally lost after a time of order
$1/\Gamma_{\gamma}$, with $\Gamma_{\gamma}= \Gamma(T^*\to T\gamma)$. Thus, by
comparing the initial and final polarization, we get information on the
particle's lifetime.
|
[
{
"created": "Wed, 12 Mar 2008 17:27:50 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Apr 2008 15:33:52 GMT",
"version": "v2"
},
{
"created": "Tue, 1 Jul 2008 14:29:32 GMT",
"version": "v3"
}
] |
2009-01-06
|
[
[
"Grossman",
"Yuval",
""
],
[
"Nachshon",
"Itay",
""
]
] |
Measurements of lifetimes can be done in two ways. For very short lived particles, the width can be measured. For long lived ones, the lifetime can be directly measured, for example, using a displaced vertex. Practically, the lifetime cannot be extracted for particles with intermediate lifetimes. We show that for such cases information about the lifetime can be extracted for heavy colored particles that can be produced with known polarization. For example, a $t$-like particle with intermediate lifetime hadronizes into a superposition of the lowest two hadronic states, $T^*$ and $T$ (the equivalent of $B^*$ and $B$). Depolarization effects are governed by time scales that are much longer than the hadronization time scale, $\lqcd^{-1}$. After a time of order $1/\Delta m$, with $\Delta m \equiv m(T^*)-m(T)$, half of the initial polarization is lost. The polarization is totally lost after a time of order $1/\Gamma_{\gamma}$, with $\Gamma_{\gamma}= \Gamma(T^*\to T\gamma)$. Thus, by comparing the initial and final polarization, we get information on the particle's lifetime.
|
hep-ph/9406286
| null |
H. Anlauf
|
On the QCD corrections to $b \to s \gamma$ in supersymmetric models
|
LaTeX, 43 pages + 4 embedded Postscript figures (requires epsf.sty),
SLAC-PUB-6525, June 1994
|
Nucl.Phys. B430 (1994) 245-277
|
10.1016/0550-3213(94)00417-X
| null |
hep-ph
| null |
We reinvestigate the leading QCD corrections to the radiative decay $b \to s
\gamma for supersymmetric extensions of the Standard Model. Although the major
contributions to the corrections originate from the running of the effective
Lagrangian from the W scale down to the $b$ scale, additional corrections are
expected from large mass splittings between the particles running in the loops,
as well as from integrating out heavy particles at scales different from the W
mass. The calculation is performed in the framework of effective field
theories.
|
[
{
"created": "Sat, 11 Jun 1994 00:00:39 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Anlauf",
"H.",
""
]
] |
We reinvestigate the leading QCD corrections to the radiative decay $b \to s \gamma for supersymmetric extensions of the Standard Model. Although the major contributions to the corrections originate from the running of the effective Lagrangian from the W scale down to the $b$ scale, additional corrections are expected from large mass splittings between the particles running in the loops, as well as from integrating out heavy particles at scales different from the W mass. The calculation is performed in the framework of effective field theories.
|
1402.5084
|
Sergey Ostapchenko
|
Sergey Ostapchenko
|
LHC data on inelastic diffraction and uncertainties in the predictions
for longitudinal EAS development
| null |
Phys. Rev. D 89, 074009 (2014)
|
10.1103/PhysRevD.89.074009
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Present status of experimental studies of inelastic diffraction at the Large
Hadron Collider is analysed. Impact of the current uncertainties concerning the
diffraction rate on the predicted extensive air shower development is
investigated. Relation to studies of the primary composition of ultrahigh
energy cosmic rays is illustrated by comparing numerical simulation results to
the data of the Telescope Array experiment on the distributions of the shower
maximum position.
|
[
{
"created": "Thu, 20 Feb 2014 17:33:09 GMT",
"version": "v1"
}
] |
2014-04-23
|
[
[
"Ostapchenko",
"Sergey",
""
]
] |
Present status of experimental studies of inelastic diffraction at the Large Hadron Collider is analysed. Impact of the current uncertainties concerning the diffraction rate on the predicted extensive air shower development is investigated. Relation to studies of the primary composition of ultrahigh energy cosmic rays is illustrated by comparing numerical simulation results to the data of the Telescope Array experiment on the distributions of the shower maximum position.
|
0705.0921
|
Debottam Das
|
Utpal Chattopadhyay, Debottam Das, Amitava Datta and Sujoy Poddar
|
Non-zero trilinear parameter in the mSUGRA model - dark matter and
collider signals at Tevatron and LHC
|
Some minor changes made in the text. To appear in Phys Rev D
|
Phys.Rev.D76:055008,2007
|
10.1103/PhysRevD.76.055008
| null |
hep-ph
| null |
Phenomenologically viable and interesting regions of parameter space in the
minimal super-gravity (mSUGRA) model with small $m_0$ and small $m_{1/2}$
consistent with the WMAP data on dark matter relic density and the bound on the
mass of the lightest Higgs scalar $ m_h>$ 114 GeV from LEP2 open up if the
rather adhoc assumption $A_0$=0, where $A_0$ is the common trilinear soft
breaking parameter, employed in most of the existing analyses is relaxed. Since
this region corresponds to relatively light squarks and gluinos which are
likely to be probed extensively in the very early stages of the LHC
experiments, the consequences of moderate or large negative values of $A_0$ are
examined in detail. We find that in this region several processes including
lightest supersymmetric particle (LSP) pair annihilation, LSP - lighter tau
slepton (${\tilde \tau}_1$) coannihilation and LSP - lighter top squark
(${\tilde t}_1$) coannihilation contribute to the observed dark matter relic
density. %\sout{The possibility that a relic density producing ${\tilde t}_1$
can be %observed at the current experiments at the Tevatron is wide open.} The
possibility that a ${\tilde t}_1$ that can participate in coannihilation with
the lightest neutralino to satisfy the WMAP bound on relic density and at the
same time be observed at the current experiments at the Tevatron is wide open.
At the LHC a large number of squark - gluino events lead to a very distinctive
semi-inclusive signature $\tau^\pm$+X$_\tau$ (anything without a tau lepton)
with a characteristic size much larger than $e^\pm$+X$_e$ or $\mu^\pm$+X$_\mu$
events.
|
[
{
"created": "Mon, 7 May 2007 14:46:34 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Aug 2007 14:03:09 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Chattopadhyay",
"Utpal",
""
],
[
"Das",
"Debottam",
""
],
[
"Datta",
"Amitava",
""
],
[
"Poddar",
"Sujoy",
""
]
] |
Phenomenologically viable and interesting regions of parameter space in the minimal super-gravity (mSUGRA) model with small $m_0$ and small $m_{1/2}$ consistent with the WMAP data on dark matter relic density and the bound on the mass of the lightest Higgs scalar $ m_h>$ 114 GeV from LEP2 open up if the rather adhoc assumption $A_0$=0, where $A_0$ is the common trilinear soft breaking parameter, employed in most of the existing analyses is relaxed. Since this region corresponds to relatively light squarks and gluinos which are likely to be probed extensively in the very early stages of the LHC experiments, the consequences of moderate or large negative values of $A_0$ are examined in detail. We find that in this region several processes including lightest supersymmetric particle (LSP) pair annihilation, LSP - lighter tau slepton (${\tilde \tau}_1$) coannihilation and LSP - lighter top squark (${\tilde t}_1$) coannihilation contribute to the observed dark matter relic density. %\sout{The possibility that a relic density producing ${\tilde t}_1$ can be %observed at the current experiments at the Tevatron is wide open.} The possibility that a ${\tilde t}_1$ that can participate in coannihilation with the lightest neutralino to satisfy the WMAP bound on relic density and at the same time be observed at the current experiments at the Tevatron is wide open. At the LHC a large number of squark - gluino events lead to a very distinctive semi-inclusive signature $\tau^\pm$+X$_\tau$ (anything without a tau lepton) with a characteristic size much larger than $e^\pm$+X$_e$ or $\mu^\pm$+X$_\mu$ events.
|
1103.1186
|
Stanley J. Brodsky
|
Stanley J. Brodsky and Guy F. de Teramond
|
Applications of AdS/QCD and Light-Front Holography to Baryon Physics
|
Presented by SJB at the International Conference on the Structure of
Baryons, BARYONS'10, December 7-11, 2010, Osaka, Japan
| null |
10.1063/1.3647346
|
SLAC-PUB-14381
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The correspondence between theories in anti-de Sitter space and field
theories in physical space-time leads to an analytic, semiclassical model for
strongly-coupled QCD which has scale invariance at short distances and color
confinement at large distances. These equations, for both mesons and baryons,
give a very good representation of the observed hadronic spectrum, including a
zero mass pion. Light-front holography allows hadronic amplitudes in the AdS
fifth dimension to be mapped to frame-independent light-front wavefunctions of
hadrons in physical space-time, thus providing a relativistic description of
hadrons at the amplitude level. The meson and baryon wavefunctions derived from
light-front holography and AdS/QCD also have remarkable phenomenological
features, including predictions for the electromagnetic form factors and decay
constants. The approach can be systematically improved using light-front
Hamiltonian methods. Some novel features of QCD for baryon physics are also
discussed.
|
[
{
"created": "Mon, 7 Mar 2011 02:39:24 GMT",
"version": "v1"
}
] |
2015-05-27
|
[
[
"Brodsky",
"Stanley J.",
""
],
[
"de Teramond",
"Guy F.",
""
]
] |
The correspondence between theories in anti-de Sitter space and field theories in physical space-time leads to an analytic, semiclassical model for strongly-coupled QCD which has scale invariance at short distances and color confinement at large distances. These equations, for both mesons and baryons, give a very good representation of the observed hadronic spectrum, including a zero mass pion. Light-front holography allows hadronic amplitudes in the AdS fifth dimension to be mapped to frame-independent light-front wavefunctions of hadrons in physical space-time, thus providing a relativistic description of hadrons at the amplitude level. The meson and baryon wavefunctions derived from light-front holography and AdS/QCD also have remarkable phenomenological features, including predictions for the electromagnetic form factors and decay constants. The approach can be systematically improved using light-front Hamiltonian methods. Some novel features of QCD for baryon physics are also discussed.
|
hep-ph/9508236
|
Steve King
|
B. C. Allanach and S. F. King
|
Fermion Masses in SUSY GUTs
|
12 pages, latex, no macros, no figures
| null | null |
SHEP 95-26
|
hep-ph
| null |
We discuss the fermion mass problem in SUSY GUTs, including such ideas as
texture zeroes, and Georgi-Jarlskog textures. We focus on a specific
supersymmetric model based on the gauge group $SU(4)\otimes SU(2)_L \otimes
SU(2)_R$. In this model the gauge group is broken to that of the standard model
at $10^{16}$ GeV, and supersymmetry is broken at low-energy. The model may be
regarded as a ``surrogate SUSY GUT'', and has several advantages over the
$SU(5)$ and $SO(10)$ SUSY GUTs, such as the absence of the doublet-triplet
splitting problem, and a simpler Higgs sector which does not involve any large
Higgs representations. The model predicts full quadruple Yukawa unification
(top-bottom-tau-tau neutrino), leading to the prediction of large top mass and
$\tan \beta$. An operator analysis leads to schemes where the strange and down
mass are predicted, and $|V_{ub}|>0.004$.
|
[
{
"created": "Fri, 4 Aug 1995 14:37:12 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Allanach",
"B. C.",
""
],
[
"King",
"S. F.",
""
]
] |
We discuss the fermion mass problem in SUSY GUTs, including such ideas as texture zeroes, and Georgi-Jarlskog textures. We focus on a specific supersymmetric model based on the gauge group $SU(4)\otimes SU(2)_L \otimes SU(2)_R$. In this model the gauge group is broken to that of the standard model at $10^{16}$ GeV, and supersymmetry is broken at low-energy. The model may be regarded as a ``surrogate SUSY GUT'', and has several advantages over the $SU(5)$ and $SO(10)$ SUSY GUTs, such as the absence of the doublet-triplet splitting problem, and a simpler Higgs sector which does not involve any large Higgs representations. The model predicts full quadruple Yukawa unification (top-bottom-tau-tau neutrino), leading to the prediction of large top mass and $\tan \beta$. An operator analysis leads to schemes where the strange and down mass are predicted, and $|V_{ub}|>0.004$.
|
hep-ph/9606298
|
Yakov Shnir
|
Per Osland and Ya. M. Shnir
|
Dyon mass bounds from electric dipole moments
|
LaTeX + 1 figure as uuencoded PostScript file
| null | null |
University of Bergen, Scientific/Technical Report No.1996-04
|
hep-ph atom-ph
| null |
Dyon loops give a contribution to the matrix element for light-by-light
scattering that violates parity and time-reversal symmetry. This effect induces
an electric dipole moment for the electron, of order $M^{-2}$, where $M$ is the
dyon mass. The current limit on the electric dipole moment of the electron
yields the lower mass bound $M>{\cal O}(1)~\mbox{TeV}$.
|
[
{
"created": "Tue, 11 Jun 1996 16:24:51 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Osland",
"Per",
""
],
[
"Shnir",
"Ya. M.",
""
]
] |
Dyon loops give a contribution to the matrix element for light-by-light scattering that violates parity and time-reversal symmetry. This effect induces an electric dipole moment for the electron, of order $M^{-2}$, where $M$ is the dyon mass. The current limit on the electric dipole moment of the electron yields the lower mass bound $M>{\cal O}(1)~\mbox{TeV}$.
|
0801.3470
|
Kalliopi Petraki
|
Kalliopi Petraki
|
Small-scale structure formation properties of chilled sterile neutrinos
as dark matter
|
6 pages, 3 figures
|
Phys.Rev.D77:105004,2008
|
10.1103/PhysRevD.77.105004
|
UCLA/08/TEP/02
|
hep-ph
| null |
We calculate the free-streaming length and the phase space density of
dark-matter sterile neutrinos produced from decays, at the electroweak scale,
of a gauge singlet in the Higgs sector. These quantities, which depend on the
dark-matter production mechanism, are relevant to the study of small-scale
structure formation and may be used to constrain or rule out dark-matter
candidates.
|
[
{
"created": "Tue, 22 Jan 2008 21:55:12 GMT",
"version": "v1"
},
{
"created": "Tue, 6 May 2008 07:47:01 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Petraki",
"Kalliopi",
""
]
] |
We calculate the free-streaming length and the phase space density of dark-matter sterile neutrinos produced from decays, at the electroweak scale, of a gauge singlet in the Higgs sector. These quantities, which depend on the dark-matter production mechanism, are relevant to the study of small-scale structure formation and may be used to constrain or rule out dark-matter candidates.
|
hep-ph/0608322
|
David Rainwater
|
V. Buescher, M. Carena, B. Dobrescu, S. Mrenna, D. Rainwater, M.
Schmitt (convenors); S. Abdullin, D. Acosta, S. Asai, O. Atramentov, H. Baer,
C. Balazs, P. Bartalini, A. Belyaev, R. Bernhard, A. Birkedal, R. Cavanaugh,
M.-C. Chen, C. Clement, A. Datta, Y. de Boer, A. DeRoeck, A. Drozdetskiy, Y.
Gershtein, D. Glenzinski, C. Group, S. Heinemeyer, M. Heldmann, J. Hubisz, M.
Karlsson, K. Kong, A. Korytov, S. Kraml, T. Krupovnickas, R. Lafaye, K. Lane,
F. Ledroit, F. Lehner, C.-J. Lin, C. Macesanu, K. Matchev, A. Menon, D.
Milstead, G. Mitselmakher, J. Morel, D. Morrissey, J. O'Farrill, Y. Pakhotin,
M. Perelstein, T. Plehn, A. Raklev, B. Scurlock, A. Sherstnev, P. Skands, Z.
Sullivan, T. Tait, X. Tata, I. Torchiani, B. Trocme, C. Wagner, G. Weiglein,
D. Zerwas
|
Tevatron-for-LHC Report: Preparations for Discoveries
|
222 pp., additional contribution added, typos/layout corrected
| null | null |
FERMILAB-CONF-06-284-T
|
hep-ph hep-ex
| null |
This is the "TeV4LHC" report of the "Physics Landscapes" Working Group,
focused on facilitating the start-up of physics explorations at the LHC by
using the experience gained at the Tevatron. We present experimental and
theoretical results that can be employed to probe various scenarios for physics
beyond the Standard Model.
|
[
{
"created": "Wed, 30 Aug 2006 14:29:24 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Oct 2006 21:33:06 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Buescher",
"V.",
"",
"convenors"
],
[
"Carena",
"M.",
"",
"convenors"
],
[
"Dobrescu",
"B.",
"",
"convenors"
],
[
"Mrenna",
"S.",
"",
"convenors"
],
[
"Rainwater",
"D.",
"",
"convenors"
],
[
"Schmitt",
"M.",
"",
"convenors"
],
[
"Abdullin",
"; S.",
""
],
[
"Acosta",
"D.",
""
],
[
"Asai",
"S.",
""
],
[
"Atramentov",
"O.",
""
],
[
"Baer",
"H.",
""
],
[
"Balazs",
"C.",
""
],
[
"Bartalini",
"P.",
""
],
[
"Belyaev",
"A.",
""
],
[
"Bernhard",
"R.",
""
],
[
"Birkedal",
"A.",
""
],
[
"Cavanaugh",
"R.",
""
],
[
"Chen",
"M. -C.",
""
],
[
"Clement",
"C.",
""
],
[
"Datta",
"A.",
""
],
[
"de Boer",
"Y.",
""
],
[
"DeRoeck",
"A.",
""
],
[
"Drozdetskiy",
"A.",
""
],
[
"Gershtein",
"Y.",
""
],
[
"Glenzinski",
"D.",
""
],
[
"Group",
"C.",
""
],
[
"Heinemeyer",
"S.",
""
],
[
"Heldmann",
"M.",
""
],
[
"Hubisz",
"J.",
""
],
[
"Karlsson",
"M.",
""
],
[
"Kong",
"K.",
""
],
[
"Korytov",
"A.",
""
],
[
"Kraml",
"S.",
""
],
[
"Krupovnickas",
"T.",
""
],
[
"Lafaye",
"R.",
""
],
[
"Lane",
"K.",
""
],
[
"Ledroit",
"F.",
""
],
[
"Lehner",
"F.",
""
],
[
"Lin",
"C. -J.",
""
],
[
"Macesanu",
"C.",
""
],
[
"Matchev",
"K.",
""
],
[
"Menon",
"A.",
""
],
[
"Milstead",
"D.",
""
],
[
"Mitselmakher",
"G.",
""
],
[
"Morel",
"J.",
""
],
[
"Morrissey",
"D.",
""
],
[
"O'Farrill",
"J.",
""
],
[
"Pakhotin",
"Y.",
""
],
[
"Perelstein",
"M.",
""
],
[
"Plehn",
"T.",
""
],
[
"Raklev",
"A.",
""
],
[
"Scurlock",
"B.",
""
],
[
"Sherstnev",
"A.",
""
],
[
"Skands",
"P.",
""
],
[
"Sullivan",
"Z.",
""
],
[
"Tait",
"T.",
""
],
[
"Tata",
"X.",
""
],
[
"Torchiani",
"I.",
""
],
[
"Trocme",
"B.",
""
],
[
"Wagner",
"C.",
""
],
[
"Weiglein",
"G.",
""
],
[
"Zerwas",
"D.",
""
]
] |
This is the "TeV4LHC" report of the "Physics Landscapes" Working Group, focused on facilitating the start-up of physics explorations at the LHC by using the experience gained at the Tevatron. We present experimental and theoretical results that can be employed to probe various scenarios for physics beyond the Standard Model.
|
hep-ph/0203269
|
Michael Spira
|
Kai-Peer O. Diener, Christian Schwanenberger, Michael Spira
|
Photoproduction of W Bosons at HERA: QCD Corrections
|
15 pages, latex, 9 figures, published version
|
Eur.Phys.J.C25:405-411,2002
|
10.1007/s10052-002-1023-x
|
DESY 02-035, KA-TP-34-2001, PSI-PR-01-15
|
hep-ph hep-ex
| null |
W bosons can be produced in the channels e+- p -> W+- + X at HERA thus
allowing to probe for anomalous trilinear couplings among the gauge bosons. We
discuss the NLO QCD corrections to the photoproduction of W bosons with finite
transverse momentum at HERA. The higher-order QCD corrections reduce the
factorization scale dependence significantly and modify the leading order cross
sections by +-O(10%).
|
[
{
"created": "Thu, 28 Mar 2002 16:10:03 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Apr 2002 07:47:25 GMT",
"version": "v2"
},
{
"created": "Fri, 3 May 2002 15:30:53 GMT",
"version": "v3"
},
{
"created": "Fri, 13 Sep 2002 16:15:48 GMT",
"version": "v4"
}
] |
2011-09-13
|
[
[
"Diener",
"Kai-Peer O.",
""
],
[
"Schwanenberger",
"Christian",
""
],
[
"Spira",
"Michael",
""
]
] |
W bosons can be produced in the channels e+- p -> W+- + X at HERA thus allowing to probe for anomalous trilinear couplings among the gauge bosons. We discuss the NLO QCD corrections to the photoproduction of W bosons with finite transverse momentum at HERA. The higher-order QCD corrections reduce the factorization scale dependence significantly and modify the leading order cross sections by +-O(10%).
|
1507.00332
|
Alexander Ochirov Dr.
|
Henrik Johansson and Alexander Ochirov
|
Color-Kinematics Duality for QCD Amplitudes
|
33 pages + refs, 7 figures, 4 tables; v3 minor corrections, journal
version
|
JHEP 1601 (2016) 170
|
10.1007/JHEP01(2016)170
|
CERN-PH-TH-2015-149, UUITP-13/15, NORDITA-2015-79, Edinburgh 2015/11
|
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We show that color-kinematics duality is present in tree-level amplitudes of
quantum chromodynamics with massive flavored quarks. Starting with the color
structure of QCD, we work out a new color decomposition for n-point tree
amplitudes in a reduced basis of primitive amplitudes. These primitives, with k
quark-antiquark pairs and (n-2k) gluons, are taken in the (n-2)!/k! Melia
basis, and are independent under the color-algebra Kleiss-Kuijf relations. This
generalizes the color decomposition of Del Duca, Dixon, and Maltoni to an
arbitrary number of quarks. The color coefficients in the new decomposition are
given by compact expressions valid for arbitrary gauge group and
representation. Considering the kinematic structure, we show through explicit
calculations that color-kinematics duality holds for amplitudes with general
configurations of gluons and massive quarks. The new (massive) amplitude
relations that follow from the duality can be mapped to a well-defined subset
of the familiar BCJ relations for gluons. They restrict the amplitude basis
further down to (n-3)!(2k-2)/k! primitives, for two or more quark lines. We
give a decomposition of the full amplitude in that basis. The presented results
provide strong evidence that QCD obeys the color-kinematics duality, at least
at tree level. The results are also applicable to supersymmetric and
D-dimensional extensions of QCD.
|
[
{
"created": "Wed, 1 Jul 2015 19:58:06 GMT",
"version": "v1"
},
{
"created": "Sat, 11 Jul 2015 12:47:28 GMT",
"version": "v2"
},
{
"created": "Mon, 7 Dec 2015 11:52:15 GMT",
"version": "v3"
}
] |
2016-01-29
|
[
[
"Johansson",
"Henrik",
""
],
[
"Ochirov",
"Alexander",
""
]
] |
We show that color-kinematics duality is present in tree-level amplitudes of quantum chromodynamics with massive flavored quarks. Starting with the color structure of QCD, we work out a new color decomposition for n-point tree amplitudes in a reduced basis of primitive amplitudes. These primitives, with k quark-antiquark pairs and (n-2k) gluons, are taken in the (n-2)!/k! Melia basis, and are independent under the color-algebra Kleiss-Kuijf relations. This generalizes the color decomposition of Del Duca, Dixon, and Maltoni to an arbitrary number of quarks. The color coefficients in the new decomposition are given by compact expressions valid for arbitrary gauge group and representation. Considering the kinematic structure, we show through explicit calculations that color-kinematics duality holds for amplitudes with general configurations of gluons and massive quarks. The new (massive) amplitude relations that follow from the duality can be mapped to a well-defined subset of the familiar BCJ relations for gluons. They restrict the amplitude basis further down to (n-3)!(2k-2)/k! primitives, for two or more quark lines. We give a decomposition of the full amplitude in that basis. The presented results provide strong evidence that QCD obeys the color-kinematics duality, at least at tree level. The results are also applicable to supersymmetric and D-dimensional extensions of QCD.
|
hep-ph/0605305
|
Sebastian Mendizabal
|
M. Loewe, S. Mendizabal, J. C. Rojas
|
Skyrmions, Hadrons and isospin chemical potential
|
10 pages, 5 figures
|
Phys.Lett. B638 (2006) 464-467
|
10.1016/j.physletb.2006.06.011
| null |
hep-ph hep-th
| null |
Using the Hamiltonian formulation, in terms of collective variables, we
explore the evolution of different skyrmionic parameters as function of the
isospin chemical potential ($\mu$), such as the energy density, the charge
density, the isoscalar radius and the isoscalar magnetic radius. We found that
the radii start to grow very fast for $\mu \gtrsim 140$ MeV, suggesting the
occurrence of a phase transition.
|
[
{
"created": "Sat, 27 May 2006 22:46:15 GMT",
"version": "v1"
}
] |
2009-11-11
|
[
[
"Loewe",
"M.",
""
],
[
"Mendizabal",
"S.",
""
],
[
"Rojas",
"J. C.",
""
]
] |
Using the Hamiltonian formulation, in terms of collective variables, we explore the evolution of different skyrmionic parameters as function of the isospin chemical potential ($\mu$), such as the energy density, the charge density, the isoscalar radius and the isoscalar magnetic radius. We found that the radii start to grow very fast for $\mu \gtrsim 140$ MeV, suggesting the occurrence of a phase transition.
|
hep-ph/9806326
|
Tom Steele
|
V. Elias, T. G. Steele
|
Pade Approximants and the Fixed-Points of the three-flavour QCD
beta-Function
|
latex, 4 pages, 2 figures
| null | null | null |
hep-ph
| null |
The positive zeros of [2|1], [1|2] and the most general possible [2|2] Pade
approximants whose Maclaurin series reproduce the presently known terms in the
three-flavour QCD beta-function are all shown to correspond to ultraviolet
fixed points.
|
[
{
"created": "Tue, 9 Jun 1998 20:24:51 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Elias",
"V.",
""
],
[
"Steele",
"T. G.",
""
]
] |
The positive zeros of [2|1], [1|2] and the most general possible [2|2] Pade approximants whose Maclaurin series reproduce the presently known terms in the three-flavour QCD beta-function are all shown to correspond to ultraviolet fixed points.
|
2109.00677
|
Christopher Cocuzza
|
C. Cocuzza, W. Melnitchouk, A. Metz, N. Sato
|
Bayesian Monte Carlo extraction of sea asymmetry with SeaQuest and STAR
data
|
10 pages, 8 figures
|
Phys. Rev. D 104, 074031 (2021)
|
10.1103/PhysRevD.104.074031
|
JLAB-THY-21-3491
|
hep-ph hep-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We perform a global QCD analysis of unpolarized parton distributions within a
Bayesian Monte Carlo framework, including the new $W$-lepton production data
from the STAR Collaboration at RHIC and Drell-Yan di-muon data from the
SeaQuest experiment at Fermilab. We assess the impact of these two new
measurements on the light antiquark sea in the proton, and the
$\bar{d}-\bar{u}$ asymmetry in particular. The SeaQuest data are found to
significantly reduce the uncertainty on the $\bar{d}/\bar{u}$ ratio at large
parton momentum fractions $x$, strongly favoring an enhanced $\bar{d}$ sea up
to $x \approx 0.4$, in general agreement with nonperturbative calculations
based on chiral symmetry breaking in QCD.
|
[
{
"created": "Thu, 2 Sep 2021 02:43:33 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Oct 2021 20:34:19 GMT",
"version": "v2"
}
] |
2021-10-29
|
[
[
"Cocuzza",
"C.",
""
],
[
"Melnitchouk",
"W.",
""
],
[
"Metz",
"A.",
""
],
[
"Sato",
"N.",
""
]
] |
We perform a global QCD analysis of unpolarized parton distributions within a Bayesian Monte Carlo framework, including the new $W$-lepton production data from the STAR Collaboration at RHIC and Drell-Yan di-muon data from the SeaQuest experiment at Fermilab. We assess the impact of these two new measurements on the light antiquark sea in the proton, and the $\bar{d}-\bar{u}$ asymmetry in particular. The SeaQuest data are found to significantly reduce the uncertainty on the $\bar{d}/\bar{u}$ ratio at large parton momentum fractions $x$, strongly favoring an enhanced $\bar{d}$ sea up to $x \approx 0.4$, in general agreement with nonperturbative calculations based on chiral symmetry breaking in QCD.
|
hep-ph/0506013
|
Robert Brandenberger
|
K.R.S. Balaji, Tirthabir Biswas, Robert H. Brandenberger and David
London
|
Dynamical CP Violation in the Early Universe and Leptogenesis
|
9 pages, 3 figures
|
Phys.Rev.D72:056005,2005
|
10.1103/PhysRevD.72.056005
|
UdeM-GPP-TH-05-134
|
hep-ph
| null |
In a recent publication, we suggested a mechanism for obtaining dynamical CP
violation in the early Universe based on the out-of-equilibrium evolution of
complex scalar fields. In this paper, we suggest several ways of transferring
the CP asymmetry from the scalar sector to the leptonic sector. In particular,
we point out how a ``transient MNS(P) matrix'' can generate an asymmetry
between fermions and anti-fermions directly.
|
[
{
"created": "Thu, 2 Jun 2005 14:54:55 GMT",
"version": "v1"
}
] |
2014-11-18
|
[
[
"Balaji",
"K. R. S.",
""
],
[
"Biswas",
"Tirthabir",
""
],
[
"Brandenberger",
"Robert H.",
""
],
[
"London",
"David",
""
]
] |
In a recent publication, we suggested a mechanism for obtaining dynamical CP violation in the early Universe based on the out-of-equilibrium evolution of complex scalar fields. In this paper, we suggest several ways of transferring the CP asymmetry from the scalar sector to the leptonic sector. In particular, we point out how a ``transient MNS(P) matrix'' can generate an asymmetry between fermions and anti-fermions directly.
|
2210.08354
|
Jose R. Pel\'aez
|
R. Alvarez Garrote (1), J. Cuervo (2), P. C. Magalh\~aes (2) and J. R.
Pel\'aez (2). ((1). CIEMAT, Madrid, (2) U. Complutense and IPARCOS, Madrid,
SPAIN)
|
Dispersive $\pi\pi\rightarrow K\bar K$ amplitude and giant CP violation
in B to three light-meson decays at LHCb
|
9 pages, 6 figures. Minor corrections and discussions were added.
Extended appendix with an additional improved model of the S-wave. Final
version as published in Phys.Rev.Lett., where the appendix became
supplemental material. Updated final values in the appendix
| null |
10.1103/PhysRevLett.130.201901
|
IPARCOS-UCM-23-033
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The LHCb collaboration has recently reported the largest CP violation effect
from a single amplitude, as well as other giant CP asymmetries in several
$B$-meson decays into three charmless light mesons. It is also claimed that
this is predominantly due to $\pi\pi\rightarrow K\bar K$ rescattering in the
final state, particularly in the 1 to 1.5 GeV region. In these analyses the
$\pi\pi\rightarrow K\bar K$ amplitude is by default estimated from the $\pi\pi$
elastic scattering amplitude and does not describe the existing
$\pi\pi\rightarrow K\bar K$ scattering data. Here we show how the recent
model-independent dispersive analysis of $\pi\pi\rightarrow K\bar K$ data can
be easily implemented in the LHCb formalism. This leads to a more accurate
description of the asymmetry, while being consistent with the measured
scattering amplitude and confirming the prominent role of hadronic final state
interactions, paving the way for more elaborated analyses.
|
[
{
"created": "Sat, 15 Oct 2022 18:25:30 GMT",
"version": "v1"
},
{
"created": "Tue, 9 May 2023 13:26:28 GMT",
"version": "v2"
},
{
"created": "Mon, 26 Jun 2023 14:46:59 GMT",
"version": "v3"
}
] |
2023-06-27
|
[
[
"Garrote",
"R. Alvarez",
""
],
[
"Cuervo",
"J.",
""
],
[
"Magalhães",
"P. C.",
""
],
[
"Peláez",
"J. R.",
""
],
[
".",
"",
""
]
] |
The LHCb collaboration has recently reported the largest CP violation effect from a single amplitude, as well as other giant CP asymmetries in several $B$-meson decays into three charmless light mesons. It is also claimed that this is predominantly due to $\pi\pi\rightarrow K\bar K$ rescattering in the final state, particularly in the 1 to 1.5 GeV region. In these analyses the $\pi\pi\rightarrow K\bar K$ amplitude is by default estimated from the $\pi\pi$ elastic scattering amplitude and does not describe the existing $\pi\pi\rightarrow K\bar K$ scattering data. Here we show how the recent model-independent dispersive analysis of $\pi\pi\rightarrow K\bar K$ data can be easily implemented in the LHCb formalism. This leads to a more accurate description of the asymmetry, while being consistent with the measured scattering amplitude and confirming the prominent role of hadronic final state interactions, paving the way for more elaborated analyses.
|
0709.0098
|
Sven Heinemeyer
|
J. Ellis, T. Hahn, S. Heinemeyer, K.A. Olive, G. Weiglein
|
WMAP-Compliant Benchmark Surfaces for MSSM Higgs Bosons
|
Minor corrections, references added. 43 pages, 10 figures. Version to
appear in JHEP
|
JHEP 0710:092,2007
|
10.1088/1126-6708/2007/10/092
|
CERN-PH-TH/2007-138, DCPT/07/102, IPPP/07/51, MPP-2007-117,
UMN-TH-2615/07, FTPI-MINN-07/25
|
hep-ph
| null |
We explore `benchmark surfaces' suitable for studying the phenomenology of
Higgs bosons in the minimal supersymmetric extension of the Standard Model
(MSSM), which are chosen so that the supersymmetric relic density is generally
compatible with the range of cold dark matter density preferred by WMAP and
other observations. These benchmark surfaces are specified assuming that
gaugino masses m_{1/2}, soft trilinear supersymmetry-breaking parameters A_0
and the soft supersymmetry-breaking contributions m_0 to the squark and slepton
masses are universal, but not those associated with the Higgs multiplets (the
NUHM framework). The benchmark surfaces may be presented as M_A-tan_beta planes
with fixed or systematically varying values of the other NUHM parameters, such
as m_0, m_{1/2}, A_0 and the Higgs mixing parameter mu. We discuss the
prospects for probing experimentally these benchmark surfaces at the Tevatron
collider, the LHC, the ILC, in B physics and in direct dark-matter detection
experiments. An Appendix documents developments in the FeynHiggs code that
enable the user to explore for her/himself the WMAP-compliant benchmark
surfaces.
|
[
{
"created": "Sun, 2 Sep 2007 10:07:46 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Oct 2007 09:50:55 GMT",
"version": "v2"
}
] |
2009-09-15
|
[
[
"Ellis",
"J.",
""
],
[
"Hahn",
"T.",
""
],
[
"Heinemeyer",
"S.",
""
],
[
"Olive",
"K. A.",
""
],
[
"Weiglein",
"G.",
""
]
] |
We explore `benchmark surfaces' suitable for studying the phenomenology of Higgs bosons in the minimal supersymmetric extension of the Standard Model (MSSM), which are chosen so that the supersymmetric relic density is generally compatible with the range of cold dark matter density preferred by WMAP and other observations. These benchmark surfaces are specified assuming that gaugino masses m_{1/2}, soft trilinear supersymmetry-breaking parameters A_0 and the soft supersymmetry-breaking contributions m_0 to the squark and slepton masses are universal, but not those associated with the Higgs multiplets (the NUHM framework). The benchmark surfaces may be presented as M_A-tan_beta planes with fixed or systematically varying values of the other NUHM parameters, such as m_0, m_{1/2}, A_0 and the Higgs mixing parameter mu. We discuss the prospects for probing experimentally these benchmark surfaces at the Tevatron collider, the LHC, the ILC, in B physics and in direct dark-matter detection experiments. An Appendix documents developments in the FeynHiggs code that enable the user to explore for her/himself the WMAP-compliant benchmark surfaces.
|
1411.6924
|
Pedro David Ruiz-Femenia
|
M. Beneke, C. Hellmann, P. Ruiz-Femenia
|
Non-relativistic pair annihilation of nearly mass degenerate neutralinos
and charginos III. Computation of the Sommerfeld enhancements
|
59 pages, 7 figures, 2 tables
| null | null |
TUM-HEP-954/14, SFB/CPP-14-69, TTK-14-21, IFIC/14-58
|
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This paper concludes the presentation of the non-relativistic effective field
theory formalism designed to calculate the radiative corrections that enhance
the pair-annihilation cross sections of slowly moving neutralinos and charginos
within the general minimal supersymmetric standard model (MSSM). While papers I
and II focused on the computation of the tree-level annihilation rates that
feed into the short-distance part, here we describe in detail the method to
obtain the Sommerfeld factors that contain the enhanced long-distance
corrections. This includes the computation of the potential interactions in the
MSSM, which are provided in compact analytic form, and a novel solution of the
multi-state Schr\"odinger equation that is free from the numerical
instabilities generated by large mass splittings between the scattering states.
Our results allow for a precise computation of the MSSM neutralino dark matter
relic abundance and pair-annihilation rates in the present Universe, when
Sommerfeld enhancements are important.
|
[
{
"created": "Tue, 25 Nov 2014 17:14:33 GMT",
"version": "v1"
}
] |
2014-11-26
|
[
[
"Beneke",
"M.",
""
],
[
"Hellmann",
"C.",
""
],
[
"Ruiz-Femenia",
"P.",
""
]
] |
This paper concludes the presentation of the non-relativistic effective field theory formalism designed to calculate the radiative corrections that enhance the pair-annihilation cross sections of slowly moving neutralinos and charginos within the general minimal supersymmetric standard model (MSSM). While papers I and II focused on the computation of the tree-level annihilation rates that feed into the short-distance part, here we describe in detail the method to obtain the Sommerfeld factors that contain the enhanced long-distance corrections. This includes the computation of the potential interactions in the MSSM, which are provided in compact analytic form, and a novel solution of the multi-state Schr\"odinger equation that is free from the numerical instabilities generated by large mass splittings between the scattering states. Our results allow for a precise computation of the MSSM neutralino dark matter relic abundance and pair-annihilation rates in the present Universe, when Sommerfeld enhancements are important.
|
hep-ph/9212221
| null |
Beth Basista and Peter Suranyi (University of Cincinnati, Cincinnati,
OH, USA)
|
Hamiltonian Effective Potential
|
21 pages
|
Phys.Rev. D48 (1993) 3826-3835
|
10.1103/PhysRevD.48.3826
| null |
hep-ph
| null |
A Hamiltonian effective potential (the logarithm of the square of the wave
functional) is defined and calculated at the tree and one loop levels in a
$\phi^4$ scalar field theory. The loop expansion for eigenfunctionals is
equivalent to the combination of WKB expansion and an expansion around constant
field configurations. The results are compared with those obtained from the
Lagrangian effective potential. While at tree level the results from the two
methods coincide, at one loop level they differ. Our result at one loop level
is that the reflection symmetry is not broken at $m^2\geq0$.
|
[
{
"created": "Thu, 3 Dec 1992 20:55:08 GMT",
"version": "v1"
}
] |
2009-10-22
|
[
[
"Basista",
"Beth",
"",
"University of Cincinnati, Cincinnati,\n OH, USA"
],
[
"Suranyi",
"Peter",
"",
"University of Cincinnati, Cincinnati,\n OH, USA"
]
] |
A Hamiltonian effective potential (the logarithm of the square of the wave functional) is defined and calculated at the tree and one loop levels in a $\phi^4$ scalar field theory. The loop expansion for eigenfunctionals is equivalent to the combination of WKB expansion and an expansion around constant field configurations. The results are compared with those obtained from the Lagrangian effective potential. While at tree level the results from the two methods coincide, at one loop level they differ. Our result at one loop level is that the reflection symmetry is not broken at $m^2\geq0$.
|
hep-ph/9905478
|
Michael Chanowitz
|
Michael S. Chanowitz
|
The Z -> bb decay asymmetry and flavor changing neutral currents
|
10 pages, 1 figure. Revision includes additional predictions for rare
K and B decays with new treatment of errors, additional references, some
other changes in presentation
| null | null |
LBNL-43248
|
hep-ph hep-ex
| null |
The measured value of A_b, the Z \bar bb asymmetry parameter, disagrees with
the Standard Model at 99% confidence level. If genuine the discrepancy could
indicate new interactions unique to third generation quarks, implying enhanced
Z penguin amplitudes. Enhanced rates are predicted for rare K and B decays,
such as K^{+} --> pi^{+}\bar nu nu, K_{L} --> pi^{0}\bar nu nu, B --> X_{s}\bar
nu nu, and B_{s} --> \bar mu mu. Measurements of epsilon^{\prime}/epsilon then
imply QCD penguin amplitudes must also be similarly enhanced. The Higgs sector
of an SU(2)_L x SU(2)_R gauge theory has some of the features needed to explain
these phenomena and would also imply right-handed penguin amplitudes.
|
[
{
"created": "Tue, 25 May 1999 20:30:09 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Jul 1999 18:56:15 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Chanowitz",
"Michael S.",
""
]
] |
The measured value of A_b, the Z \bar bb asymmetry parameter, disagrees with the Standard Model at 99% confidence level. If genuine the discrepancy could indicate new interactions unique to third generation quarks, implying enhanced Z penguin amplitudes. Enhanced rates are predicted for rare K and B decays, such as K^{+} --> pi^{+}\bar nu nu, K_{L} --> pi^{0}\bar nu nu, B --> X_{s}\bar nu nu, and B_{s} --> \bar mu mu. Measurements of epsilon^{\prime}/epsilon then imply QCD penguin amplitudes must also be similarly enhanced. The Higgs sector of an SU(2)_L x SU(2)_R gauge theory has some of the features needed to explain these phenomena and would also imply right-handed penguin amplitudes.
|
2011.10374
|
Hiroshi Okada
|
Yasuhiro Daikoku, Hiroshi Okada
|
Lepton Anomalous Magnetic Moments in an $S_4$ Flavor-Symmetric Extra
U(1) Model
|
41 pages, two figures, two tables; updated the experimental result
for muon g-2, and added references
| null | null |
APCTP Pre2020 - 032
|
hep-ph
|
http://creativecommons.org/publicdomain/zero/1.0/
|
We study supersymmetric extra U(1) model with $S_4$ flavor symmetry. The
flavor symmetry not only stabilizes proton but also suppresses the flavor
changing processes without raising the supersymmetry breaking scale. After the
flavor symmetry is broken, the Yukawa hierarchy is realized by the
Froggatt-Nielsen mechanism. The relevant Peccei-Quinn scale for axion dark
matter: $\frac{f_a}{M_P}\sim 10^{-5}$ accounts for small up quark mass. The
muon mass scale: $\frac{m_\mu}{M_W}\sim 10^{-3}$ is related to the $O(10^{-6})$
mass degeneracy of right-handed neutrinos, from which we can identify the
relevant scale of right-handed neutrino mass for baryon asymmetry of the
Universe as TeV. Due to the existence of the extra higgsinos, the discrepancies
of the anomalous magnetic moments of the muon and the electron between the
standard model predictions and the observations are explained by the
chargino-sneutrino contributions simultaneously.
|
[
{
"created": "Fri, 20 Nov 2020 12:27:47 GMT",
"version": "v1"
},
{
"created": "Sat, 28 Nov 2020 03:34:04 GMT",
"version": "v2"
}
] |
2020-12-01
|
[
[
"Daikoku",
"Yasuhiro",
""
],
[
"Okada",
"Hiroshi",
""
]
] |
We study supersymmetric extra U(1) model with $S_4$ flavor symmetry. The flavor symmetry not only stabilizes proton but also suppresses the flavor changing processes without raising the supersymmetry breaking scale. After the flavor symmetry is broken, the Yukawa hierarchy is realized by the Froggatt-Nielsen mechanism. The relevant Peccei-Quinn scale for axion dark matter: $\frac{f_a}{M_P}\sim 10^{-5}$ accounts for small up quark mass. The muon mass scale: $\frac{m_\mu}{M_W}\sim 10^{-3}$ is related to the $O(10^{-6})$ mass degeneracy of right-handed neutrinos, from which we can identify the relevant scale of right-handed neutrino mass for baryon asymmetry of the Universe as TeV. Due to the existence of the extra higgsinos, the discrepancies of the anomalous magnetic moments of the muon and the electron between the standard model predictions and the observations are explained by the chargino-sneutrino contributions simultaneously.
|
1007.2581
|
Frithjof Karsch
|
Frithjof Karsch and Krzysztof Redlich
|
Probing freeze-out conditions in heavy ion collisions with moments of
charge fluctuations
|
20 pages, 11 EPS-files
|
Phys.Lett.B695:136-142,2011
|
10.1016/j.physletb.2010.10.046
|
CERN-PH-TH-2010-161
|
hep-ph hep-lat
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We calculate the first four moments of baryon number, electric charge and
strangeness fluctuations within the hadron resonance gas model. Different
moments and their ratios as well as skewness and kurtosis are evaluated on the
phenomenologically determined freeze-out curve in the temperature, baryon
chemical potential plane. The model results and its predictions as well as
relations between different moments are compared with the first data on net
proton fluctuations in Au-Au collisions obtained at RHIC by the STAR
Collaboration. We find good agreement between the model calculations and
experimental results. We also point out that higher order moments should be
more sensitive to critical behavior and will also distinguish hadron resonance
gas model calculations from results obtained from lattice QCD.
|
[
{
"created": "Thu, 15 Jul 2010 14:56:41 GMT",
"version": "v1"
}
] |
2011-06-27
|
[
[
"Karsch",
"Frithjof",
""
],
[
"Redlich",
"Krzysztof",
""
]
] |
We calculate the first four moments of baryon number, electric charge and strangeness fluctuations within the hadron resonance gas model. Different moments and their ratios as well as skewness and kurtosis are evaluated on the phenomenologically determined freeze-out curve in the temperature, baryon chemical potential plane. The model results and its predictions as well as relations between different moments are compared with the first data on net proton fluctuations in Au-Au collisions obtained at RHIC by the STAR Collaboration. We find good agreement between the model calculations and experimental results. We also point out that higher order moments should be more sensitive to critical behavior and will also distinguish hadron resonance gas model calculations from results obtained from lattice QCD.
|
hep-ph/9407239
| null |
Riccardo Barbieri, Gia Dvali and Alessandro Strumia
|
Fermion masses and mixings in a flavour symmetric GUT
|
10 pages, no figures, preprint IFUP - TH 32/94
|
Nucl.Phys.B435:102-114,1995
|
10.1016/0550-3213(94)00510-L
| null |
hep-ph
| null |
We describe a supersymmetric Grand Unified Theory based on the gauge group
$\SU(5)^3$, or $\SO(10)^3$, invariant under the interchange of any~SU(5),
or~SO(10), with each family multiplet transforming non trivially under one
different individual group factor. A realistic pattern of fermion masses and
mixings is obtained as a result of an appropriate choice out of the many
possible discretely degenerate vacua of the theory. In the~SO(10) case, we
predict the three neutrino masses in terms of an overall scale and, within
factors of order unity, their mixing angles. A $\nu_e$-$\nu_\mu$ oscillation is
suggested as a solution of the solar neutrino problem, implying a visible
$\nu_\mu$-$\nu_\tau$ oscillation in the forthcoming experiments. Grand unified
theories of this type could be obtainable in a string theory framework.
|
[
{
"created": "Wed, 6 Jul 1994 13:49:50 GMT",
"version": "v1"
}
] |
2009-10-09
|
[
[
"Barbieri",
"Riccardo",
""
],
[
"Dvali",
"Gia",
""
],
[
"Strumia",
"Alessandro",
""
]
] |
We describe a supersymmetric Grand Unified Theory based on the gauge group $\SU(5)^3$, or $\SO(10)^3$, invariant under the interchange of any~SU(5), or~SO(10), with each family multiplet transforming non trivially under one different individual group factor. A realistic pattern of fermion masses and mixings is obtained as a result of an appropriate choice out of the many possible discretely degenerate vacua of the theory. In the~SO(10) case, we predict the three neutrino masses in terms of an overall scale and, within factors of order unity, their mixing angles. A $\nu_e$-$\nu_\mu$ oscillation is suggested as a solution of the solar neutrino problem, implying a visible $\nu_\mu$-$\nu_\tau$ oscillation in the forthcoming experiments. Grand unified theories of this type could be obtainable in a string theory framework.
|
0807.1068
|
Marco Guzzi
|
Claudio Coriano, Alon E. Faraggi, Marco Guzzi
|
Z-prime Searches at the LHC: Some QCD Precision Studies in Drell-Yan
|
Talk given at IFAE (Incontri di Fisica delle Alte Energie), Bologna
Italy, 26-28 March 2008, 4 pages, 1 Table
|
Nuovo Cim.B123:781-783,2008; Nuovo Cim.123B:781-783,2008
|
10.1393/ncb/i2008-10573-y
| null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Discovery potentials for extra neutral interactions at the Large Hadron
Collider in forthcoming experiments are analyzed in Drell-Yan. For this purpose
we use high precision next-to-next-to-leading order (NNLO) determination of the
mass invarian distributions and of the total cross sections in the kinematic
region around 1 TeV. In this region we explore the possibility to make a
preliminary distinction between different anomaly-free extentions of the
Standard Model.
|
[
{
"created": "Mon, 7 Jul 2008 16:52:36 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Jul 2008 17:18:48 GMT",
"version": "v2"
},
{
"created": "Wed, 9 Jul 2008 07:37:39 GMT",
"version": "v3"
}
] |
2010-11-15
|
[
[
"Coriano",
"Claudio",
""
],
[
"Faraggi",
"Alon E.",
""
],
[
"Guzzi",
"Marco",
""
]
] |
Discovery potentials for extra neutral interactions at the Large Hadron Collider in forthcoming experiments are analyzed in Drell-Yan. For this purpose we use high precision next-to-next-to-leading order (NNLO) determination of the mass invarian distributions and of the total cross sections in the kinematic region around 1 TeV. In this region we explore the possibility to make a preliminary distinction between different anomaly-free extentions of the Standard Model.
|
hep-ph/9805381
|
Markus Diehl
|
M. Diehl and T. Gousset
|
Non-diagonal parton distribution functions
|
4 pages, 2 figures, LaTeX2e. Talk given at the International Workshop
on Deep Inelastic Scattering and QCD (DIS 98), Brussels, Belgium
| null | null |
DAPNIA-SPHN-98-35
|
hep-ph
| null |
We explain why the time ordering in the definition of non-diagonal parton
distributions can be omitted and discuss the physics implications.
|
[
{
"created": "Tue, 19 May 1998 17:30:03 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Diehl",
"M.",
""
],
[
"Gousset",
"T.",
""
]
] |
We explain why the time ordering in the definition of non-diagonal parton distributions can be omitted and discuss the physics implications.
|
1907.06429
|
Dr. Rukmani Mohanta
|
Subhasmita Mishra, Mitesh Kumar Behera, Rukmani Mohanta, Sudhanwa
Patra, Shivaramakrishna Singirala
|
Neutrino Phenomenology and Dark matter in an $A_4$ flavour extended B-L
model
|
29 pages, 13 figures, version to appear in EPJC
| null |
10.1140/epjc/s10052-020-7968-9
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present an $A_4$ flavor extended $\rm B-L$ model for realization of eV
scale sterile neutrinos, motivated by the recent experimental hints from both
particle physics and cosmology. The framework considered here is a gauged $\rm
B-L$ extension of standard model without the introduction of right-handed
neutrinos, where the gauge triangle anomalies are canceled with the inclusion
of three exotic neutral fermions $N_{i}$ ($i=1,2,3$) with $\rm B-L$ charges
$-4,-4$ and $5$. The usual Dirac Yukawa couplings between the SM neutrinos and
the exotic fermions are absent and thus, the model allows natural realization
of eV scale sterile-like neutrino and its mixing with standard model neutrinos
by invoking $\rm A_4$ flavor symmetry. We demonstrate how the exact
tri-bimaximal mixing pattern is perturbed due to active-sterile mixing by
analyzing $1+3$ case in detail. We also show the implication of eV scale
sterile-like neutrino on various observables in neutrino oscillation
experiments and the effective mass in neutrinoless double beta decay. Another
interesting feature of the model is that one of three exotic fermions is
required to explain eV scale phenomena, while other two fermions form stable
dark matter candidates and their total relic density satisfy the observed
$3\sigma$ limit of Planck data. We constrain the gauge parameters associated
with $U(1)$ gauge extension, using relic density and collider bounds.
|
[
{
"created": "Mon, 15 Jul 2019 10:58:07 GMT",
"version": "v1"
},
{
"created": "Sat, 25 Apr 2020 08:21:59 GMT",
"version": "v2"
}
] |
2020-06-24
|
[
[
"Mishra",
"Subhasmita",
""
],
[
"Behera",
"Mitesh Kumar",
""
],
[
"Mohanta",
"Rukmani",
""
],
[
"Patra",
"Sudhanwa",
""
],
[
"Singirala",
"Shivaramakrishna",
""
]
] |
We present an $A_4$ flavor extended $\rm B-L$ model for realization of eV scale sterile neutrinos, motivated by the recent experimental hints from both particle physics and cosmology. The framework considered here is a gauged $\rm B-L$ extension of standard model without the introduction of right-handed neutrinos, where the gauge triangle anomalies are canceled with the inclusion of three exotic neutral fermions $N_{i}$ ($i=1,2,3$) with $\rm B-L$ charges $-4,-4$ and $5$. The usual Dirac Yukawa couplings between the SM neutrinos and the exotic fermions are absent and thus, the model allows natural realization of eV scale sterile-like neutrino and its mixing with standard model neutrinos by invoking $\rm A_4$ flavor symmetry. We demonstrate how the exact tri-bimaximal mixing pattern is perturbed due to active-sterile mixing by analyzing $1+3$ case in detail. We also show the implication of eV scale sterile-like neutrino on various observables in neutrino oscillation experiments and the effective mass in neutrinoless double beta decay. Another interesting feature of the model is that one of three exotic fermions is required to explain eV scale phenomena, while other two fermions form stable dark matter candidates and their total relic density satisfy the observed $3\sigma$ limit of Planck data. We constrain the gauge parameters associated with $U(1)$ gauge extension, using relic density and collider bounds.
|
1508.06682
|
C. Pallis
|
G. Lazarides and C. Pallis
|
Shift Symmetry and Higgs Inflation in Supergravity with Observable
Gravitational Waves
|
Final version with some typos corrected
| null |
10.1007/JHEP11(2015)114
| null |
hep-ph astro-ph.CO hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We demonstrate how to realize within supergravity a novel chaotic-type
inflationary scenario driven by the radial parts of a conjugate pair of Higgs
superfields causing the spontaneous breaking of a grand unified gauge symmetry
at a scale assuming the value of the supersymmetric grand unification scale.
The superpotential is uniquely determined at the renormalizable level by the
gauge symmetry and a continuous R symmetry. We select two types of Kahler
potentials, which respect these symmetries as well as an approximate shift
symmetry. In particular, they include in a logarithm a dominant shift-symmetric
term proportional to a parameter c- together with a small term violating this
symmetry and characterized by a parameter c+. In both cases, imposing a lower
bound on c-, inflation can be attained with subplanckian values of the original
inflaton, while the corresponding effective theory respects perturbative
unitarity for r+-=c+/c-<1. These inflationary models do not lead to
overproduction of cosmic defects, are largely independent of the one-loop
radiative corrections and accommodate, for natural values of r+-, observable
gravitational waves consistently with all the current observational data. The
inflaton mass is mostly confined in the range (3.7-8.1)x10^10 GeV.
|
[
{
"created": "Wed, 26 Aug 2015 23:06:25 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Oct 2015 11:31:16 GMT",
"version": "v2"
},
{
"created": "Thu, 3 Dec 2015 16:05:41 GMT",
"version": "v3"
},
{
"created": "Thu, 7 Jul 2016 13:05:20 GMT",
"version": "v4"
}
] |
2016-07-08
|
[
[
"Lazarides",
"G.",
""
],
[
"Pallis",
"C.",
""
]
] |
We demonstrate how to realize within supergravity a novel chaotic-type inflationary scenario driven by the radial parts of a conjugate pair of Higgs superfields causing the spontaneous breaking of a grand unified gauge symmetry at a scale assuming the value of the supersymmetric grand unification scale. The superpotential is uniquely determined at the renormalizable level by the gauge symmetry and a continuous R symmetry. We select two types of Kahler potentials, which respect these symmetries as well as an approximate shift symmetry. In particular, they include in a logarithm a dominant shift-symmetric term proportional to a parameter c- together with a small term violating this symmetry and characterized by a parameter c+. In both cases, imposing a lower bound on c-, inflation can be attained with subplanckian values of the original inflaton, while the corresponding effective theory respects perturbative unitarity for r+-=c+/c-<1. These inflationary models do not lead to overproduction of cosmic defects, are largely independent of the one-loop radiative corrections and accommodate, for natural values of r+-, observable gravitational waves consistently with all the current observational data. The inflaton mass is mostly confined in the range (3.7-8.1)x10^10 GeV.
|
1504.04533
|
Abhijit Bhattacharyya Prof.
|
Abhijit Bhattacharyya, Sanjay K. Ghosh, Rajarshi Ray and Subhasis
Samanta
|
Exploring effects of magnetic field on the Hadron Resonance Gas
| null |
EPL, 115 (2016) 62003
|
10.1209/0295-5075/115/62003
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a study of the effects of magnetic fields on fluctuations and
correlations in hadron resonance gas model. We find significant changes in the
fluctuations of net baryon number, electric charge and strangeness. This is
also reflected in various fluctuation ratios along the freezeout curve.
|
[
{
"created": "Fri, 17 Apr 2015 15:21:02 GMT",
"version": "v1"
},
{
"created": "Sat, 14 Nov 2015 09:18:21 GMT",
"version": "v2"
},
{
"created": "Sat, 5 Nov 2016 07:55:11 GMT",
"version": "v3"
}
] |
2016-11-08
|
[
[
"Bhattacharyya",
"Abhijit",
""
],
[
"Ghosh",
"Sanjay K.",
""
],
[
"Ray",
"Rajarshi",
""
],
[
"Samanta",
"Subhasis",
""
]
] |
We present a study of the effects of magnetic fields on fluctuations and correlations in hadron resonance gas model. We find significant changes in the fluctuations of net baryon number, electric charge and strangeness. This is also reflected in various fluctuation ratios along the freezeout curve.
|
hep-ph/9512356
|
Stefano Bertolini
|
S. Bertolini, J.O. Eeg, and M. Fabbrichesi
|
A New Estimate of $\varepsilon '/\varepsilon$
|
40 pages, uuencoded LATEX2e file including 13 eps figures, revised
version to appear in Nucl. Phys. B
|
Nucl.Phys.B476:225-254,1996
|
10.1016/0550-3213(96)00335-5
|
SISSA 103/95/EP
|
hep-ph
| null |
We discuss direct $CP$ violation in the standard model by giving a new
estimate of $\varepsilon'/\varepsilon$ in kaon decays. Our analysis is based on
the evaluation of the hadronic matrix elements of the \mbox{$\Delta S =1$}
effective quark lagrangian by means of the chiral quark model, with the
inclusion of meson one-loop renormalization and NLO Wilson coefficients. Our
estimate is fully consistent with the $\Delta I =1/2$ selection rule in $K\to
\pi\pi$ decays which is well reproduced within the same framework. By varying
all parameters in the allowed ranges and, in particular, taking the quark
condensate---which is the major source of uncertainty---between $(-200\ {\rm
MeV})^3$ and $(-280\ {\rm MeV})^3$ we find $$ -5.0 \times 10^{-3}\
<\varepsilon'/\varepsilon <\ 1.4 \times 10^{-3}\ .$$ Assuming for the quark
condensate the improved PCAC result \mbox{$\vev{\bar qq} = -(221\: \pm 17\ {\rm
MeV})^3$} and fixing $\Lambda_{\rm QCD}^{(4)}$ to its central value, we find
the more restrictive prediction $$\varepsilon '/\varepsilon = ( 4 \pm 5 )
\,\times \,10^{-4}\ , $$ where the central value is defined as the average over
the allowed values of Im $\lambda_t$ in the first and second quadrants. In
these estimates the relevant mixing parameter Im $\lambda_t$ is
self-consistently obtained from $\varepsilon$ and we take $m_t^{\rm pole} = 180
\pm 12$ GeV. Our result is, to a very good approximation, renormalization-scale
and $\gamma_5$-scheme independent.
|
[
{
"created": "Tue, 19 Dec 1995 22:34:13 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Jun 1996 09:35:51 GMT",
"version": "v2"
}
] |
2014-11-17
|
[
[
"Bertolini",
"S.",
""
],
[
"Eeg",
"J. O.",
""
],
[
"Fabbrichesi",
"M.",
""
]
] |
We discuss direct $CP$ violation in the standard model by giving a new estimate of $\varepsilon'/\varepsilon$ in kaon decays. Our analysis is based on the evaluation of the hadronic matrix elements of the \mbox{$\Delta S =1$} effective quark lagrangian by means of the chiral quark model, with the inclusion of meson one-loop renormalization and NLO Wilson coefficients. Our estimate is fully consistent with the $\Delta I =1/2$ selection rule in $K\to \pi\pi$ decays which is well reproduced within the same framework. By varying all parameters in the allowed ranges and, in particular, taking the quark condensate---which is the major source of uncertainty---between $(-200\ {\rm MeV})^3$ and $(-280\ {\rm MeV})^3$ we find $$ -5.0 \times 10^{-3}\ <\varepsilon'/\varepsilon <\ 1.4 \times 10^{-3}\ .$$ Assuming for the quark condensate the improved PCAC result \mbox{$\vev{\bar qq} = -(221\: \pm 17\ {\rm MeV})^3$} and fixing $\Lambda_{\rm QCD}^{(4)}$ to its central value, we find the more restrictive prediction $$\varepsilon '/\varepsilon = ( 4 \pm 5 ) \,\times \,10^{-4}\ , $$ where the central value is defined as the average over the allowed values of Im $\lambda_t$ in the first and second quadrants. In these estimates the relevant mixing parameter Im $\lambda_t$ is self-consistently obtained from $\varepsilon$ and we take $m_t^{\rm pole} = 180 \pm 12$ GeV. Our result is, to a very good approximation, renormalization-scale and $\gamma_5$-scheme independent.
|
hep-ph/9911324
|
Taizan Watari
|
Yasunori Nomura, T. Watari, and T. Yanagida
|
Mass Generation for an Ultralight Axion
|
11 pages, Latex
|
Phys.Rev.D61:105007,2000
|
10.1103/PhysRevD.61.105007
|
UT-862
|
hep-ph astro-ph
| null |
If a global chiral symmetry is explicitly broken by anomalies in nonabelian
gauge theories, a pseudo Nambu-Goldstone boson (axion) associated with a
spontaneous breakdown of such a global symmetry acquires a mass through
nonperturbative instanton effects. We calculate the axion mass assuming a
supersymmetric SU(2) gauge theory and show that the axion obtains an extremely
small mass when the SU(2) gauge symmetry is broken down at very high energy,
say at the Planck scale. We identify the axion with a hypothetical ultralight
boson field proposed to account for a small but nonzero cosmological constant
suggested from recent cosmological observations.
|
[
{
"created": "Fri, 12 Nov 1999 05:51:37 GMT",
"version": "v1"
}
] |
2009-09-29
|
[
[
"Nomura",
"Yasunori",
""
],
[
"Watari",
"T.",
""
],
[
"Yanagida",
"T.",
""
]
] |
If a global chiral symmetry is explicitly broken by anomalies in nonabelian gauge theories, a pseudo Nambu-Goldstone boson (axion) associated with a spontaneous breakdown of such a global symmetry acquires a mass through nonperturbative instanton effects. We calculate the axion mass assuming a supersymmetric SU(2) gauge theory and show that the axion obtains an extremely small mass when the SU(2) gauge symmetry is broken down at very high energy, say at the Planck scale. We identify the axion with a hypothetical ultralight boson field proposed to account for a small but nonzero cosmological constant suggested from recent cosmological observations.
|
2009.14642
|
Till Martini
|
Till Martini, Manfred Kraus, Sascha Peitzsch, and Peter Uwer
|
The Matrix Element Method as a tool for precision and accuracy
|
9 pages, 4 figures, proccedings to European Physical Society
Conference on High Energy Physics - EPS-HEP2019 - 10-17 July, 2019, Ghent,
Belgium
|
PoS(EPS-HEP2019)673
| null |
HU-EP-20/25
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The Matrix Element Method is a promising multi-variate analysis tool which
offers an optimal approach to compare theory and experiment according to the
Neyman-Pearson lemma. However, until recently its usage has been limited by the
fact that only leading-order predictions could be employed. The imperfect
approximation of the underlying probability distribution can introduce a
significant bias into the analysis which requires a major calibration for the
method when applied to parameter determination. Moreover, estimating
theoretical uncertainties by scale variation may yield unreliable results. We
present the extension of the Matrix Element Method to next-to-leading order in
QCD applicable to LHC data defined by common jet algorithms. The accuracy gain
is illustrated by simulating a top-quark mass determination from single
top-quark events generated with POWHEG+PYTHIA. Additionally, the method's
potential for BSM parameter determination is demonstrated by simulating the
extraction of a CP-violating Top-Yukawa coupling from events of single
top-quarks in association with a Higgs boson.
|
[
{
"created": "Wed, 30 Sep 2020 12:50:52 GMT",
"version": "v1"
}
] |
2020-10-01
|
[
[
"Martini",
"Till",
""
],
[
"Kraus",
"Manfred",
""
],
[
"Peitzsch",
"Sascha",
""
],
[
"Uwer",
"Peter",
""
]
] |
The Matrix Element Method is a promising multi-variate analysis tool which offers an optimal approach to compare theory and experiment according to the Neyman-Pearson lemma. However, until recently its usage has been limited by the fact that only leading-order predictions could be employed. The imperfect approximation of the underlying probability distribution can introduce a significant bias into the analysis which requires a major calibration for the method when applied to parameter determination. Moreover, estimating theoretical uncertainties by scale variation may yield unreliable results. We present the extension of the Matrix Element Method to next-to-leading order in QCD applicable to LHC data defined by common jet algorithms. The accuracy gain is illustrated by simulating a top-quark mass determination from single top-quark events generated with POWHEG+PYTHIA. Additionally, the method's potential for BSM parameter determination is demonstrated by simulating the extraction of a CP-violating Top-Yukawa coupling from events of single top-quarks in association with a Higgs boson.
|
hep-ph/9604362
|
Naoyuki Haba
|
Naoyuki Haba
|
Large Majorana Mass from the Anomalous U(1) Gauge Symmetry
|
11 pages, LaTex
|
Prog.Theor.Phys.97:293-300,1997
|
10.1143/PTP.97.293
|
DPNU-96-22
|
hep-ph
| null |
We show a new and simple model which induces large Majorana masses of
right-handed neutrinos. It is based on U(1)_X anomalous gauge symmetry, which
is cancelled by the Green-Schwarz mechanism. These Majorana masses can solve
the solar neutrino problem by the vacuum oscillation mechanism. The
superpotential of this model is scale invariant. The field contents are simple
extensions of the MSSM, which have four standard gauge singlet fields, two
extra vector-like fields, and right-handed neutrinos in addition to the MSSM.
|
[
{
"created": "Fri, 19 Apr 1996 12:39:04 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Sep 1996 11:47:13 GMT",
"version": "v2"
}
] |
2011-07-19
|
[
[
"Haba",
"Naoyuki",
""
]
] |
We show a new and simple model which induces large Majorana masses of right-handed neutrinos. It is based on U(1)_X anomalous gauge symmetry, which is cancelled by the Green-Schwarz mechanism. These Majorana masses can solve the solar neutrino problem by the vacuum oscillation mechanism. The superpotential of this model is scale invariant. The field contents are simple extensions of the MSSM, which have four standard gauge singlet fields, two extra vector-like fields, and right-handed neutrinos in addition to the MSSM.
|
hep-ph/0205199
|
Yosuke Uehara
|
Yosuke Uehara
|
New Potential of Black Holes : Quest for TeV-Scale Physics by Measuring
Top Quark Sector using Black Holes
|
18 pages, 2 figures
| null | null |
UT-02-30
|
hep-ph hep-ex
| null |
If TeV-scale gravity models are correct, the production of black holes will
be the first signal of new physics. Once black holes are produced, they will
give us much information about TeV-scale new physics directly. But such black
holes can also be used for the precision measurements of the Standard Model
(SM). The SM is nothing but a theory which can describe weak-scale, and
TeV-scale physics will affect it. So if some experimental results which cannot
be explained in the SM are found, they will be attributed to TeV-scale physics
and we can obtain ``bottom-up'' type information about new physics. In this
paper, we consider the precision measurements of the top sector at the LHC by
using black holes. The stringent trigger conditions to confirm the black hole
production vanish almost all of the QCD background, and we can examine the top
quark emitted from black holes very precisely. The error of the top quark mass
and the top Yukawa coupling are drastically reduced, leading to a very accurate
test of the Higgs mechanism. We can directly measure the CKM matrix element
|V_{ts}|, and we will understand the property of the CKM matrix and the origin
of CP-violation deeply. The very precise measurements of such properties in the
SM, enabled by black holes, can become treasures in the quest for TeV-scale
physics because there exists a possibility that TeV-scale physics affects them
and destroys the predictions of the SM. By combining the direct information of
new physics obtained from black holes themselves and the indirect information
obtained from the limitations of the SM, we will be able to identify TeV-scale
physics correctly.
|
[
{
"created": "Mon, 20 May 2002 05:30:40 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Uehara",
"Yosuke",
""
]
] |
If TeV-scale gravity models are correct, the production of black holes will be the first signal of new physics. Once black holes are produced, they will give us much information about TeV-scale new physics directly. But such black holes can also be used for the precision measurements of the Standard Model (SM). The SM is nothing but a theory which can describe weak-scale, and TeV-scale physics will affect it. So if some experimental results which cannot be explained in the SM are found, they will be attributed to TeV-scale physics and we can obtain ``bottom-up'' type information about new physics. In this paper, we consider the precision measurements of the top sector at the LHC by using black holes. The stringent trigger conditions to confirm the black hole production vanish almost all of the QCD background, and we can examine the top quark emitted from black holes very precisely. The error of the top quark mass and the top Yukawa coupling are drastically reduced, leading to a very accurate test of the Higgs mechanism. We can directly measure the CKM matrix element |V_{ts}|, and we will understand the property of the CKM matrix and the origin of CP-violation deeply. The very precise measurements of such properties in the SM, enabled by black holes, can become treasures in the quest for TeV-scale physics because there exists a possibility that TeV-scale physics affects them and destroys the predictions of the SM. By combining the direct information of new physics obtained from black holes themselves and the indirect information obtained from the limitations of the SM, we will be able to identify TeV-scale physics correctly.
|
hep-ph/0409112
|
Alexei Nefediev
|
A.V.Nefediev (ITEP, Moscow), J.E.F.T.Ribeiro (IST, Lisbon)
|
Mesonic states and vacuum replicas in potential quark models for QCD
|
RevTeX4, 37 pages, 5 Postscript figures, uses epsfig.sty, to appear
in Phys.Rev.D
|
Phys.Rev. D70 (2004) 094020
|
10.1103/PhysRevD.70.094020
| null |
hep-ph
| null |
In this paper, we study generic non-local NJL models for four-dimensional QCD
in the limit of a large number of colours. We diagonalise, through a
Bogoliubov-type transformation, the Hamiltonian of the model completely in
terms of the compound operators creating/annihilating mesons - bound states of
dressed quarks and antiquarks - and demonstrate a one-to-one correspondence
between the Bogoliubov diagonalisation condition and the Bethe-Salpeter
equation for bound states. We conclude that, in the leading order in N_C, the
nontrivial contents of the theory is entirely encoded in the chiral angle - the
solution to the mass-gap equation for dressed quarks. As a consequence, we
extend the statement of existence of excited solutions to the mass-gap
equation, called vacuum replicas, beyond the BCS level and prescribe a new
index to the mesonic operators - the label of the vacuum state in which the
corresponding meson is created.
|
[
{
"created": "Thu, 9 Sep 2004 13:18:28 GMT",
"version": "v1"
}
] |
2009-11-10
|
[
[
"Nefediev",
"A. V.",
"",
"ITEP, Moscow"
],
[
"Ribeiro",
"J. E. F. T.",
"",
"IST, Lisbon"
]
] |
In this paper, we study generic non-local NJL models for four-dimensional QCD in the limit of a large number of colours. We diagonalise, through a Bogoliubov-type transformation, the Hamiltonian of the model completely in terms of the compound operators creating/annihilating mesons - bound states of dressed quarks and antiquarks - and demonstrate a one-to-one correspondence between the Bogoliubov diagonalisation condition and the Bethe-Salpeter equation for bound states. We conclude that, in the leading order in N_C, the nontrivial contents of the theory is entirely encoded in the chiral angle - the solution to the mass-gap equation for dressed quarks. As a consequence, we extend the statement of existence of excited solutions to the mass-gap equation, called vacuum replicas, beyond the BCS level and prescribe a new index to the mesonic operators - the label of the vacuum state in which the corresponding meson is created.
|
2405.00281
|
Zhi-Gang Wang
|
Xiu-Wu Wang, Zhi-Gang Wang
|
Doubly-Charm and Doubly-Bottom Pentaquark molecular States via the QCD
sum rules
|
12 pages, 10 figures
|
Int. J. Mod. Phys. A39 (2024) 2450067
|
10.1142/S0217751X24500672
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
In the present work, the doubly-charm and doubly-bottom pentaquark molecular
states $D^{(*)}\Sigma_c^{(*)}$ and $B^{(*)}\Sigma_b^{(*)}$ are studied via the
QCD sum rules. Sixteen color singlet-singlet type currents with the definite
isospin-spin-parity $IJ^P$ are constructed to interpolate the corresponding
hadronic states with the same quantum numbers. The masses and pole residues of
those doubly-heavy pentaquark molecular states are calculated, the results show
that their masses are all below the corresponding meson-baryon thresholds,
which means that they are possible bound states, not resonant states, moreover,
the possible decay channels for the doubly-charm molecular states are given.
|
[
{
"created": "Wed, 1 May 2024 02:16:19 GMT",
"version": "v1"
}
] |
2024-07-30
|
[
[
"Wang",
"Xiu-Wu",
""
],
[
"Wang",
"Zhi-Gang",
""
]
] |
In the present work, the doubly-charm and doubly-bottom pentaquark molecular states $D^{(*)}\Sigma_c^{(*)}$ and $B^{(*)}\Sigma_b^{(*)}$ are studied via the QCD sum rules. Sixteen color singlet-singlet type currents with the definite isospin-spin-parity $IJ^P$ are constructed to interpolate the corresponding hadronic states with the same quantum numbers. The masses and pole residues of those doubly-heavy pentaquark molecular states are calculated, the results show that their masses are all below the corresponding meson-baryon thresholds, which means that they are possible bound states, not resonant states, moreover, the possible decay channels for the doubly-charm molecular states are given.
|
1704.04529
|
Ulrich Nierste
|
Ulrich Nierste
|
Penguin pollution in $\beta$ and $\beta_s$
|
Talk at CKM2016, 28 November - 3 December 2016 Tata Institute for
Fundamental Research (TIFR), Mumbai, India
| null | null |
TTP17-020
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The mixing-induced CP asymmetries in $B_d \to J/\psi K_S$ and $B_s \to J/\psi
\phi$ are essential to detect or constrain new physics in the $B_d\! -
\overline{\!B}{}_d$ and $B_s\! - \overline{\!B}{}_s$ mixing amplitudes,
respectively. To this end one must control the penguin contributions to the
decay amplitudes, which affect the extraction of fundamental CP phases from the
measured CP asymmetries. Although the "penguin pollution" is doubly
Cabibbo-suppressed, it could compete in size with current experimental errors.
In this talk I present a calculation of the penguin contributions treating QCD
effects with soft-collinear factorisation and compare method and results with
the alternative approach employing flavour-SU(3) symmetry. As a novel feature,
I present results for the penguin pollution in $b\to c\overline c d$ modes.
|
[
{
"created": "Fri, 14 Apr 2017 20:00:59 GMT",
"version": "v1"
}
] |
2017-04-18
|
[
[
"Nierste",
"Ulrich",
""
]
] |
The mixing-induced CP asymmetries in $B_d \to J/\psi K_S$ and $B_s \to J/\psi \phi$ are essential to detect or constrain new physics in the $B_d\! - \overline{\!B}{}_d$ and $B_s\! - \overline{\!B}{}_s$ mixing amplitudes, respectively. To this end one must control the penguin contributions to the decay amplitudes, which affect the extraction of fundamental CP phases from the measured CP asymmetries. Although the "penguin pollution" is doubly Cabibbo-suppressed, it could compete in size with current experimental errors. In this talk I present a calculation of the penguin contributions treating QCD effects with soft-collinear factorisation and compare method and results with the alternative approach employing flavour-SU(3) symmetry. As a novel feature, I present results for the penguin pollution in $b\to c\overline c d$ modes.
|
1504.05414
|
Tri-Nang Pham
|
T. N. Pham
|
$\eta-\eta^{\prime}$ mixing
|
LaTeX, 11 pages, v2, text and references added, to appear in PRD
|
Phys. Rev. D 92, 054021 (2015)
|
10.1103/PhysRevD.92.054021
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The $\eta -\eta^{\prime}$ mixing mass term due to the derivative coupling
$SU(3)\times SU(3)$ symmetry breaking term, produces an additional
momentum-dependent pole term for processes with $\eta^{\prime}$, but is
suppressed in the $\eta$ amplitude by a factor
$m_{\eta}^{2}/m_{\eta^{\prime}}^{2}$. This seems to be the origin of the
two-angle description of the pseudo-scalar decay constants used in the
literature. In this paper, by diagonalizing both the mixing mass term and the
momentum-dependent mixing term, we show that the $\eta -\eta^{\prime}$ system
could be described by a meson field renormalization and a new mixing angle
$\theta$ which differs from the usual mixing angle $\theta_{P}$ by a small
momentum-dependent mixing $d$ term. This new mixing scheme with exact treatment
of the momentum-dependent mixing term, is actually simpler than the
perturbation treatment and should be used in any determination of the $\eta
-\eta^{\prime}$ mixing angle and the momentum-dependent mixing term. Assuming
nonet symmetry for the $\eta_{0}$ singlet amplitude, from the sum rules
relating $\theta$ and $d$ to the measured vector meson radiative decays
amplitudes, we obtain consistent solutions with $\theta=-(13.99\pm
3.1)^{\circ}$, $d=0.12\pm 0.03$ from $\rho\to\eta\gamma$ and
$\eta^{\prime}\to\rho\gamma$ decays, for $\omega$ , $\theta=-(15.47\pm
3.1)^{\circ}$, $d=0.11\pm 0.03$, and for $\phi$, $\theta=-(12.66\pm
2.1)^{\circ}$, $d=0.10\pm 0.03$. It seems that vector meson radiative decays
would favor a small $\eta-\eta^{\prime}$ mixing angle and a small
momentum-dependent mixing term.
|
[
{
"created": "Tue, 21 Apr 2015 13:08:58 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Sep 2015 09:15:29 GMT",
"version": "v2"
}
] |
2015-09-23
|
[
[
"Pham",
"T. N.",
""
]
] |
The $\eta -\eta^{\prime}$ mixing mass term due to the derivative coupling $SU(3)\times SU(3)$ symmetry breaking term, produces an additional momentum-dependent pole term for processes with $\eta^{\prime}$, but is suppressed in the $\eta$ amplitude by a factor $m_{\eta}^{2}/m_{\eta^{\prime}}^{2}$. This seems to be the origin of the two-angle description of the pseudo-scalar decay constants used in the literature. In this paper, by diagonalizing both the mixing mass term and the momentum-dependent mixing term, we show that the $\eta -\eta^{\prime}$ system could be described by a meson field renormalization and a new mixing angle $\theta$ which differs from the usual mixing angle $\theta_{P}$ by a small momentum-dependent mixing $d$ term. This new mixing scheme with exact treatment of the momentum-dependent mixing term, is actually simpler than the perturbation treatment and should be used in any determination of the $\eta -\eta^{\prime}$ mixing angle and the momentum-dependent mixing term. Assuming nonet symmetry for the $\eta_{0}$ singlet amplitude, from the sum rules relating $\theta$ and $d$ to the measured vector meson radiative decays amplitudes, we obtain consistent solutions with $\theta=-(13.99\pm 3.1)^{\circ}$, $d=0.12\pm 0.03$ from $\rho\to\eta\gamma$ and $\eta^{\prime}\to\rho\gamma$ decays, for $\omega$ , $\theta=-(15.47\pm 3.1)^{\circ}$, $d=0.11\pm 0.03$, and for $\phi$, $\theta=-(12.66\pm 2.1)^{\circ}$, $d=0.10\pm 0.03$. It seems that vector meson radiative decays would favor a small $\eta-\eta^{\prime}$ mixing angle and a small momentum-dependent mixing term.
|
2202.06007
|
Pravin Kumar Natwariya Mr.
|
Pravin Kumar Natwariya and Alekha C. Nayak
|
Bounds on sterile neutrino lifetime and mixing angle with active
neutrinos by global 21 cm signal
|
Published in Physics Letters B
|
Physics Letters B 827, 136955 (2022)
|
10.1016/j.physletb.2022.136955
| null |
hep-ph astro-ph.CO
|
http://creativecommons.org/licenses/by/4.0/
|
Sterile neutrinos can be a possible candidate for dark matter. Sterile
neutrinos are radiatively unstable and can inject photon energy into the
intergalactic medium (IGM). The injection of photon energy into IGM can modify
the temperature and ionization history of IGM gas during cosmic dawn.
Theoretical models based on the {\Lambda}CDM framework predict an absorption
profile in the 21 cm line during the cosmic dawn era. Recently, the Experiment
to Detect the Global Epoch of Reionization Signature (EDGES) collaboration
confirmed such an adsorption signal. Injection of energy into IGM can modify
the absorption amplitude in the 21 cm signal. Considering the 21 cm absorption
signal at cosmic dawn, we constrain the lifetime of sterile neutrinos and the
mixing angle of sterile neutrinos with active neutrinos. We also compare these
bounds with other astrophysical observational bounds.
|
[
{
"created": "Sat, 12 Feb 2022 07:45:36 GMT",
"version": "v1"
}
] |
2022-04-01
|
[
[
"Natwariya",
"Pravin Kumar",
""
],
[
"Nayak",
"Alekha C.",
""
]
] |
Sterile neutrinos can be a possible candidate for dark matter. Sterile neutrinos are radiatively unstable and can inject photon energy into the intergalactic medium (IGM). The injection of photon energy into IGM can modify the temperature and ionization history of IGM gas during cosmic dawn. Theoretical models based on the {\Lambda}CDM framework predict an absorption profile in the 21 cm line during the cosmic dawn era. Recently, the Experiment to Detect the Global Epoch of Reionization Signature (EDGES) collaboration confirmed such an adsorption signal. Injection of energy into IGM can modify the absorption amplitude in the 21 cm signal. Considering the 21 cm absorption signal at cosmic dawn, we constrain the lifetime of sterile neutrinos and the mixing angle of sterile neutrinos with active neutrinos. We also compare these bounds with other astrophysical observational bounds.
|
2103.14637
|
Antonino Di Piazza
|
T. Podszus and A. Di Piazza
|
First-order strong-field QED processes including the damping of
particles states
|
31 pages, 5 figures
|
Phys. Rev. D 104, 016014 (2021)
|
10.1103/PhysRevD.104.016014
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Volkov states are exact solutions of the Dirac equation in the presence of an
arbitrary plane wave. Volkov states, as well as free photon states, are not
stable in the presence of the background plane-wave field but "decay" as
electrons/positrons can emit photons and photons can transform into
electron-positron pairs. By using the solutions of the corresponding
Schwinger-Dyson equations within the locally-constant field approximation, we
compute the probabilities of nonlinear single Compton scattering and nonlinear
Breit-Wheeler pair production by including the effects of the decay of
electron, positron, and photon states. As a result, we find that the
probabilities of these processes can be expressed as the integral over the
light-cone time of the known probabilities valid for stable states per unit of
light-cone time times a light-cone time-dependent exponential damping function
for each interacting particle. The exponential function for an incoming
(outgoing) either electron/positron or photon at each light-cone time
corresponds to the total probability that either the electron/positron emits a
photon via nonlinear Compton scattering or the photon transforms into an
electron-positron pair via nonlinear Breit-Wheeler pair production until that
light-cone time (from that light-cone time on). It is interesting that the
exponential damping terms depend not only on the particles momentum but also on
their spin (for electrons/positrons) and polarization (for photons). This
additional dependence on the discrete quantum numbers prevents the application
of the electron/positron spin and photon polarization sum-rules, which
significantly simplify the computations in the perturbative regime.
|
[
{
"created": "Fri, 26 Mar 2021 17:54:49 GMT",
"version": "v1"
}
] |
2021-07-28
|
[
[
"Podszus",
"T.",
""
],
[
"Di Piazza",
"A.",
""
]
] |
Volkov states are exact solutions of the Dirac equation in the presence of an arbitrary plane wave. Volkov states, as well as free photon states, are not stable in the presence of the background plane-wave field but "decay" as electrons/positrons can emit photons and photons can transform into electron-positron pairs. By using the solutions of the corresponding Schwinger-Dyson equations within the locally-constant field approximation, we compute the probabilities of nonlinear single Compton scattering and nonlinear Breit-Wheeler pair production by including the effects of the decay of electron, positron, and photon states. As a result, we find that the probabilities of these processes can be expressed as the integral over the light-cone time of the known probabilities valid for stable states per unit of light-cone time times a light-cone time-dependent exponential damping function for each interacting particle. The exponential function for an incoming (outgoing) either electron/positron or photon at each light-cone time corresponds to the total probability that either the electron/positron emits a photon via nonlinear Compton scattering or the photon transforms into an electron-positron pair via nonlinear Breit-Wheeler pair production until that light-cone time (from that light-cone time on). It is interesting that the exponential damping terms depend not only on the particles momentum but also on their spin (for electrons/positrons) and polarization (for photons). This additional dependence on the discrete quantum numbers prevents the application of the electron/positron spin and photon polarization sum-rules, which significantly simplify the computations in the perturbative regime.
|
0908.4184
|
Eliecer Hernandez-Gajate
|
J.E. Amaro, E. Hern\'andez, J. Nieves, M. Valverde, M.J. Vicente-Vacas
|
Neutrino induced weak pion production off the nucleon and coherent pion
production in nuclei at low energies
|
Talk given at the NUINT09 Conference. 6 latex pages, 4 figures
|
AIP Conf.Proc.1189:224-229,2009
|
10.1063/1.3274160
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a microscopic model for neutrino induced one-pion production off
the nucleon and its implementation for the purpose of calculating coherent pion
production in nuclei.
We further criticize the use of the Rein--Sehgal model for coherent pion
production by low energy neutrinos. In particular, we show how the
approximations in that model give rise to a much flatter differential cross
section in the $\eta=E_\pi(1-\cos\theta_\pi)$ variable. We discuss the
limitations intrinsic to any approach based on the partial conservation of the
axial current hypothesis and the inability of such models to properly determine
the angular distribution of the outgoing pion with respect to the direction of
the incoming neutrino. We show the effects of those limitation for the case of
the $\frac{d\sigma}{d\eta}$ differential cross section.
|
[
{
"created": "Fri, 28 Aug 2009 10:33:03 GMT",
"version": "v1"
}
] |
2009-12-07
|
[
[
"Amaro",
"J. E.",
""
],
[
"Hernández",
"E.",
""
],
[
"Nieves",
"J.",
""
],
[
"Valverde",
"M.",
""
],
[
"Vicente-Vacas",
"M. J.",
""
]
] |
We present a microscopic model for neutrino induced one-pion production off the nucleon and its implementation for the purpose of calculating coherent pion production in nuclei. We further criticize the use of the Rein--Sehgal model for coherent pion production by low energy neutrinos. In particular, we show how the approximations in that model give rise to a much flatter differential cross section in the $\eta=E_\pi(1-\cos\theta_\pi)$ variable. We discuss the limitations intrinsic to any approach based on the partial conservation of the axial current hypothesis and the inability of such models to properly determine the angular distribution of the outgoing pion with respect to the direction of the incoming neutrino. We show the effects of those limitation for the case of the $\frac{d\sigma}{d\eta}$ differential cross section.
|
1803.05913
|
Taiki Morinaga
|
Taiki Morinaga and Shoichi Yamada
|
Linear stability analysis of collective neutrino oscillations without
spurious modes
|
17 pages, 16 figures, minor revisions to match published version in
PRD
|
Phys. Rev. D 97, 023024 (2018)
|
10.1103/PhysRevD.97.023024
| null |
hep-ph astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Collective neutrino oscillations are induced by the presence of neutrinos
themselves. As such they are intrinsically nonlinear phenomena and are much
more complex than linear counterparts such as the vacuum or MSW oscillations.
They obey integro-differential equations, numerical solutions of which are also
very challenging. If one focuses on the onset of the collective oscillations,
on the other hand, the equations can be linearized and the technique of linear
analysis can be employed. Unfortunately, however, it is well known that such an
analysis, when applied with discretizations of continuous angular
distributions, suffers from the appearance of so-called spurious modes,
unphysical eigenmodes of the discretized linear equations. In this paper, we
analyze in detail the origin of these unphysical modes and present a simple
solution to this annoying problem. We have found that the spurious modes
originate from the artificial production of pole singularities instead of a
branch cut in the Riemann surface by the discretizations. The branching point
singularities in the Riemann surface for the original undiscretized equations
can be recovered by approximating the angular distributions with polynomials
and then performing the integrals analytically. We demonstrate for some
examples that this simple prescription removes the spurious modes indeed. We
also propose an even simpler method: a piecewise linear approximation to the
angular distribution. It is shown that the same methodology is applicable to
the multi-energy case as well as to the dispersion relation approach that was
proposed very recently.
|
[
{
"created": "Thu, 15 Mar 2018 18:00:01 GMT",
"version": "v1"
}
] |
2018-03-19
|
[
[
"Morinaga",
"Taiki",
""
],
[
"Yamada",
"Shoichi",
""
]
] |
Collective neutrino oscillations are induced by the presence of neutrinos themselves. As such they are intrinsically nonlinear phenomena and are much more complex than linear counterparts such as the vacuum or MSW oscillations. They obey integro-differential equations, numerical solutions of which are also very challenging. If one focuses on the onset of the collective oscillations, on the other hand, the equations can be linearized and the technique of linear analysis can be employed. Unfortunately, however, it is well known that such an analysis, when applied with discretizations of continuous angular distributions, suffers from the appearance of so-called spurious modes, unphysical eigenmodes of the discretized linear equations. In this paper, we analyze in detail the origin of these unphysical modes and present a simple solution to this annoying problem. We have found that the spurious modes originate from the artificial production of pole singularities instead of a branch cut in the Riemann surface by the discretizations. The branching point singularities in the Riemann surface for the original undiscretized equations can be recovered by approximating the angular distributions with polynomials and then performing the integrals analytically. We demonstrate for some examples that this simple prescription removes the spurious modes indeed. We also propose an even simpler method: a piecewise linear approximation to the angular distribution. It is shown that the same methodology is applicable to the multi-energy case as well as to the dispersion relation approach that was proposed very recently.
|
hep-ph/0308030
|
Eef van Beveren
|
Eef van Beveren and George Rupp
|
W-boson unitarity effects and oscillations in the neutral Kaon system
|
10 pages plain LaTeX; table in v1 contains two errors; corrected in
v2 v3 conclusions rephrased
| null | null | null |
hep-ph
| null |
We study the effects on oscillations in the neutral-Kaon system from lepton
and hadron self-energy loops in the W-boson propagators. The corresponding W
box diagrams are evaluated by attaching the external quark lines to covariant
vertex functions for the composite Kaons, integrating over all off-shell
momenta. We find that the ratio of the imaginary and real parts of the
amplitude is of the same size as with the experimental value of the modulus of
the CP-violating parameter epsilon.
|
[
{
"created": "Mon, 4 Aug 2003 14:57:48 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Aug 2003 16:32:50 GMT",
"version": "v2"
},
{
"created": "Mon, 18 Aug 2003 16:33:15 GMT",
"version": "v3"
}
] |
2007-05-23
|
[
[
"van Beveren",
"Eef",
""
],
[
"Rupp",
"George",
""
]
] |
We study the effects on oscillations in the neutral-Kaon system from lepton and hadron self-energy loops in the W-boson propagators. The corresponding W box diagrams are evaluated by attaching the external quark lines to covariant vertex functions for the composite Kaons, integrating over all off-shell momenta. We find that the ratio of the imaginary and real parts of the amplitude is of the same size as with the experimental value of the modulus of the CP-violating parameter epsilon.
|
2312.13411
|
Mark Goodsell
|
Alon E. Faraggi, Mark D. Goodsell
|
$M_W$ in String Derived $Z'$ Models
|
17 pages, update to BSMArt available at
https://goodsell.pages.in2p3.fr/bsmart/
| null | null | null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We introduce a phenomenological model for a string-derived $Z'$ scenario, and
study its predictions for the mass of the W boson. In the process, we compare
it to collider constraints for both pair-produced particles, Higgs boson
properties, and $Z'$ searches. We also describe the implementation of new tools
in the scanning code BSMArt.
|
[
{
"created": "Wed, 20 Dec 2023 20:29:49 GMT",
"version": "v1"
}
] |
2024-01-01
|
[
[
"Faraggi",
"Alon E.",
""
],
[
"Goodsell",
"Mark D.",
""
]
] |
We introduce a phenomenological model for a string-derived $Z'$ scenario, and study its predictions for the mass of the W boson. In the process, we compare it to collider constraints for both pair-produced particles, Higgs boson properties, and $Z'$ searches. We also describe the implementation of new tools in the scanning code BSMArt.
|
1501.04909
|
S. V. Troitsky
|
Ivan Karpikov, Maxim Piskunov, Anton Sokolov and Sergey Troitsky
|
Constraining spacetime variations of nuclear decay rates from light
curves of type Ia supernovae
|
11 pages, 2 figures. V2: larger data set used, constraints improved
significantly; text revised considerably
|
Phys. Rev. D 91, 127301 (2015)
|
10.1103/PhysRevD.91.127301
|
INR-TH/2015-005
|
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The luminosity of fading type Ia supernovae is governed by radioactive decays
of 56Ni and 56Co. The decay rates are proportional to the Fermi coupling
constant G_F and, therefore, are determined by the vacuum expectation value v
of the Brout-Englert-Higgs field. We use publicly available sets of light
curves of type Ia supernova at various redshifts to constrain possible
spacetime variations of the 56Ni decay rate. The resulting constraint is not
very tight; however, it is the only direct bound on the variation of the decay
rate for redshifts up to z~1. We discuss potential applications of the result
to searches for non-constancy of G_F and v.
|
[
{
"created": "Tue, 20 Jan 2015 18:32:40 GMT",
"version": "v1"
},
{
"created": "Tue, 12 May 2015 18:34:43 GMT",
"version": "v2"
}
] |
2015-06-10
|
[
[
"Karpikov",
"Ivan",
""
],
[
"Piskunov",
"Maxim",
""
],
[
"Sokolov",
"Anton",
""
],
[
"Troitsky",
"Sergey",
""
]
] |
The luminosity of fading type Ia supernovae is governed by radioactive decays of 56Ni and 56Co. The decay rates are proportional to the Fermi coupling constant G_F and, therefore, are determined by the vacuum expectation value v of the Brout-Englert-Higgs field. We use publicly available sets of light curves of type Ia supernova at various redshifts to constrain possible spacetime variations of the 56Ni decay rate. The resulting constraint is not very tight; however, it is the only direct bound on the variation of the decay rate for redshifts up to z~1. We discuss potential applications of the result to searches for non-constancy of G_F and v.
|
hep-ph/9404287
|
Erwin Mirkes
|
T. Brodkorb and E. Mirkes
|
DISJET 1.2: A Monte Carlo Program for Jet Cross Section Calculations in
Deep Inelastic Scattering
|
An error in the finite part of the O(alphas^2) virtual corrections to
the quark initiated (2+1)-jet subprocess is corrected. An error in the
labelling of the O(alphas^2) (3+1)-jet subprocesses is corrected. An
additional kinematical cut has been implemented
| null | null |
MADPH-94-821;
|
hep-ph
| null |
We present a new parton level Monte Carlo program for the calculation of jet
cross sections in Deep Inelastic Scattering based on Born and next-to-leading
order matrix elements. Using a class of invariant jet definition schemes, the
program allows for the calculation of differential distributions of jet cross
sections in the basic kinematical variables (like s, x, y, W^2, Q^2...) as well
as for total jet cross sections. Various kinematical cuts can be chosen from an
input file.
|
[
{
"created": "Tue, 19 Apr 1994 01:35:44 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Apr 1995 02:14:34 GMT",
"version": "v2"
}
] |
2008-02-03
|
[
[
"Brodkorb",
"T.",
""
],
[
"Mirkes",
"E.",
""
]
] |
We present a new parton level Monte Carlo program for the calculation of jet cross sections in Deep Inelastic Scattering based on Born and next-to-leading order matrix elements. Using a class of invariant jet definition schemes, the program allows for the calculation of differential distributions of jet cross sections in the basic kinematical variables (like s, x, y, W^2, Q^2...) as well as for total jet cross sections. Various kinematical cuts can be chosen from an input file.
|
hep-ph/0701182
|
Georg Raffelt
|
G.G.Raffelt (MPI Physik) G.Sigl (APC Paris)
|
Self-induced decoherence in dense neutrino gases
|
Revtex, 16 pages, 12 figures
|
Phys.Rev.D75:083002,2007
|
10.1103/PhysRevD.75.083002
|
MPP-2007-6
|
hep-ph astro-ph
| null |
Dense neutrino gases exhibit collective oscillations where "self-maintained
coherence" is a characteristic feature, i.e., neutrinos of different energies
oscillate with the same frequency. In a non-isotropic gas, however, the flux
term of the neutrino-neutrino interaction has the opposite effect of causing
kinematical decoherence of neutrinos propagating in different directions, an
effect that is at the origin of the "multi-angle behavior" of neutrinos
streaming off a supernova core. We cast the equations of motion in a form where
the role of the flux term is manifest. We study in detail the symmetric case of
equal neutrino and antineutrino densities where the evolution consists of
collective pair conversions ("bipolar oscillations"). A gas of this sort is
unstable in that an infinitesimal anisotropy is enough to trigger a run-away
towards flavor equipartition. The "self-maintained coherence" of a perfectly
isotropic gas gives way to "self-induced decoherence."
|
[
{
"created": "Mon, 22 Jan 2007 14:37:57 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Raffelt",
"G. G.",
"",
"MPI Physik"
],
[
"Sigl",
"G.",
"",
"APC Paris"
]
] |
Dense neutrino gases exhibit collective oscillations where "self-maintained coherence" is a characteristic feature, i.e., neutrinos of different energies oscillate with the same frequency. In a non-isotropic gas, however, the flux term of the neutrino-neutrino interaction has the opposite effect of causing kinematical decoherence of neutrinos propagating in different directions, an effect that is at the origin of the "multi-angle behavior" of neutrinos streaming off a supernova core. We cast the equations of motion in a form where the role of the flux term is manifest. We study in detail the symmetric case of equal neutrino and antineutrino densities where the evolution consists of collective pair conversions ("bipolar oscillations"). A gas of this sort is unstable in that an infinitesimal anisotropy is enough to trigger a run-away towards flavor equipartition. The "self-maintained coherence" of a perfectly isotropic gas gives way to "self-induced decoherence."
|
hep-ph/0409148
|
Eberhard Klempt
|
Eberhard Klempt
|
The Glueball Candidate \eta(1440) as \eta Radial Excitation
|
8 pages, 3 figures, contribution to ICHEP04, Beijing, 2004
| null |
10.1142/9789812702227_0217
| null |
hep-ph
| null |
The Particle Data Group decided to split the $\eta(1440)$ into two states,
called $\eta_L$ and $\eta_H$. The $\eta(1295)$ and the $\eta_H$ are supposed to
be the radial excitations of the $\eta$ and $\eta'$, respectively. The $\eta_L$
state cannot be accomodated in a quark model; it cannot be a $q\bar q$ state,
however, it might be a glueball. In this contribution it is shown that that the
$\eta(1295)$ does not have the properties which must be expected for a radially
excited state. The splitting of the $\eta(1440)$ is traced to a node in the
wave function of a radial excitation. Hence the two peaks, $\eta_L$ and
$\eta_H$, originate from one resonance which is interpreted here as first
radial excitation of the $\eta$.
|
[
{
"created": "Tue, 14 Sep 2004 19:56:10 GMT",
"version": "v1"
}
] |
2017-08-23
|
[
[
"Klempt",
"Eberhard",
""
]
] |
The Particle Data Group decided to split the $\eta(1440)$ into two states, called $\eta_L$ and $\eta_H$. The $\eta(1295)$ and the $\eta_H$ are supposed to be the radial excitations of the $\eta$ and $\eta'$, respectively. The $\eta_L$ state cannot be accomodated in a quark model; it cannot be a $q\bar q$ state, however, it might be a glueball. In this contribution it is shown that that the $\eta(1295)$ does not have the properties which must be expected for a radially excited state. The splitting of the $\eta(1440)$ is traced to a node in the wave function of a radial excitation. Hence the two peaks, $\eta_L$ and $\eta_H$, originate from one resonance which is interpreted here as first radial excitation of the $\eta$.
|
hep-ph/0207193
|
Piotr Zenczykowski
|
P. Zenczykowski (Institute of Nuclear Physics, Krakow, Poland)
|
Weak radiative hyperon decays
|
5 pages, uses espcrc2.sty; invited talk at the 5th International
Conference on Hyperons, Charm and Beauty Hadrons (BEACH2002), University of
british Columbia, Vancouver, June 25-29,2002
|
Nucl.Phys.Proc.Suppl. 115 (2003) 24-28
|
10.1016/S0920-5632(02)01946-1
| null |
hep-ph
| null |
The problem of weak radiative hyperon decays (WRHD) is reviewed. With the
recent measurement of the $\Xi ^0 \to \Lambda \gamma$ asymmetry confirming
Hara's theorem, implications from its violation in low-energy theoretical
approaches are discussed. It is shown how an underlying symmetry link should be
formulated for a successful description of both nonleptonic and radiative weak
hyperon decays. The sign of the $\Xi ^0 \to \Lambda \gamma$ asymmetry and the
overall size of parity-violating WRHD amplitudes together lead to the
resolution of the old S:P problem in nonleptonic decays.
|
[
{
"created": "Tue, 16 Jul 2002 13:24:26 GMT",
"version": "v1"
}
] |
2009-11-07
|
[
[
"Zenczykowski",
"P.",
"",
"Institute of Nuclear Physics, Krakow, Poland"
]
] |
The problem of weak radiative hyperon decays (WRHD) is reviewed. With the recent measurement of the $\Xi ^0 \to \Lambda \gamma$ asymmetry confirming Hara's theorem, implications from its violation in low-energy theoretical approaches are discussed. It is shown how an underlying symmetry link should be formulated for a successful description of both nonleptonic and radiative weak hyperon decays. The sign of the $\Xi ^0 \to \Lambda \gamma$ asymmetry and the overall size of parity-violating WRHD amplitudes together lead to the resolution of the old S:P problem in nonleptonic decays.
|
0710.2214
|
Satoru Kaneko
|
Satoru Kaneko
|
Decay of Charged Higgs boson in TeV scale supersymmetric seesaw model
|
Submitted for the SUSY07 proceedings, 4 pages, LaTeX, 4 figures
| null | null | null |
hep-ph
| null |
We discuss phenomenological consequences of some class of supersymmetric
seesaw models in which the right-handed (s)neutrino mass is given to be TeV
scale. In this scenario, scalar trilinear interaction of
Higgs-slepton-(right-handed) sneutrino is enhanced. We show that the 1-loop
correction by sneutrino exchange to the lightest Higgs boson mass destructively
interferes with top-stop contributions in the minimal SUSY Standard Model. We
find that a decay of charged Higgs boson into sneutrino and charged slepton is
sizably enhanced and hence it gives rise to a distinctive signal at future
collider experiments in some parameter space.
|
[
{
"created": "Thu, 11 Oct 2007 11:07:31 GMT",
"version": "v1"
}
] |
2007-10-12
|
[
[
"Kaneko",
"Satoru",
""
]
] |
We discuss phenomenological consequences of some class of supersymmetric seesaw models in which the right-handed (s)neutrino mass is given to be TeV scale. In this scenario, scalar trilinear interaction of Higgs-slepton-(right-handed) sneutrino is enhanced. We show that the 1-loop correction by sneutrino exchange to the lightest Higgs boson mass destructively interferes with top-stop contributions in the minimal SUSY Standard Model. We find that a decay of charged Higgs boson into sneutrino and charged slepton is sizably enhanced and hence it gives rise to a distinctive signal at future collider experiments in some parameter space.
|
hep-ph/0011189
|
Grzegorz Wilk
|
G.Wilk and Z.Wlodarczyk
|
Imprints of Nonextensivity in Multiparticle Production
|
LaTeX, 2 PS files with figures, 14 pages altogether. Invited talk
presented by G.Wilk at 6th International Workshop on Relativistic Aspects of
Nuclear Physics (RANP2000), Caraguatatuba, Tabatinga Beach, Sao Paulo,
Brazil, October 17-20, 2000. To be published in the proceedings (World
Scientific, Singapore). Minor changes, references updated
| null |
10.1142/9789812799814_0006
| null |
hep-ph cond-mat nucl-th
| null |
The statistical methods based on the classical Boltzmann-Gibbs (BG) approach
are at heart of essentially all descriptions of multiparticle production
processes. In many cases, however, one observes some deviations from the
expected behaviour. It is also known that conditions necessary for the BG
statistics to apply are usually satisfied only approximately. Two attitudes are
possible in such situations: either to abandon statistical approach trying some
other model or to generalise it to the so called nonextensive statistics
(widely used in the similar circumstances in many other branches of physics).
We shall provide here an overview of possible imprints of non-extensitivity
existing both in high energy cosmic ray physics and in multiparticle production
processes in hadronic collisions, in particular in heavy ion collisions.
|
[
{
"created": "Wed, 15 Nov 2000 08:29:28 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Nov 2000 17:38:50 GMT",
"version": "v2"
}
] |
2017-08-23
|
[
[
"Wilk",
"G.",
""
],
[
"Wlodarczyk",
"Z.",
""
]
] |
The statistical methods based on the classical Boltzmann-Gibbs (BG) approach are at heart of essentially all descriptions of multiparticle production processes. In many cases, however, one observes some deviations from the expected behaviour. It is also known that conditions necessary for the BG statistics to apply are usually satisfied only approximately. Two attitudes are possible in such situations: either to abandon statistical approach trying some other model or to generalise it to the so called nonextensive statistics (widely used in the similar circumstances in many other branches of physics). We shall provide here an overview of possible imprints of non-extensitivity existing both in high energy cosmic ray physics and in multiparticle production processes in hadronic collisions, in particular in heavy ion collisions.
|
hep-ph/0109116
|
Boris Krippa
|
B. Krippa
|
A note on the Georgi vector limit at finite temperature/density
|
11 pages, Latex. Abstract and address are corrected, typos removed
| null | null |
UMIST-01-97
|
hep-ph
| null |
The mechanism of chiral symmetry restoration in the context of the Georgi
Vector Limit (GVL) at finite temperature/density is discussed.
It is suggested that, whereas the system may be driven to the GVL, the fact
of reaching the point of restoration does not neceserily mean the complete
realization of the GVL since the other mechanisms of restoration may contribute
at lower temperatures/densities.
|
[
{
"created": "Thu, 13 Sep 2001 15:42:18 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Sep 2001 18:11:21 GMT",
"version": "v2"
},
{
"created": "Mon, 17 Sep 2001 16:30:30 GMT",
"version": "v3"
}
] |
2016-09-06
|
[
[
"Krippa",
"B.",
""
]
] |
The mechanism of chiral symmetry restoration in the context of the Georgi Vector Limit (GVL) at finite temperature/density is discussed. It is suggested that, whereas the system may be driven to the GVL, the fact of reaching the point of restoration does not neceserily mean the complete realization of the GVL since the other mechanisms of restoration may contribute at lower temperatures/densities.
|
hep-ph/0012235
|
Narison
|
Stephan Narison (CNRS-Montpellier)
|
Scalar Mesons in QCD
|
Two-column latex files, 8 pages
|
Nucl.Phys.Proc.Suppl.96:244-251,2001
|
10.1016/S0920-5632(01)01137-9
| null |
hep-ph
| null |
We review the analysis of the quark and gluon substructures of the scalar
mesons from QCD spectral sum rules and some low-energy theorems applied to the
scalar QCD anomaly current. The present data favour equal components of \bar
uu+ \bar dd and of gg in the wave functions of the low-mass (below 1 GeV)
scalar mesons, which make the wide \sigma and the narrow f_0(980) as \eta'-like
particles, which can have strong couplings to meson pairs through OZI
violations. A coherent picture of the other I=0 scalar mesons spectra within
this mixing scheme is shortly discussed. We also expect the a_0(980) to be the
lowest isovector \bar ud state, and the K^*_0(1430) its \bar ds partner.
|
[
{
"created": "Mon, 18 Dec 2000 18:46:41 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Narison",
"Stephan",
"",
"CNRS-Montpellier"
]
] |
We review the analysis of the quark and gluon substructures of the scalar mesons from QCD spectral sum rules and some low-energy theorems applied to the scalar QCD anomaly current. The present data favour equal components of \bar uu+ \bar dd and of gg in the wave functions of the low-mass (below 1 GeV) scalar mesons, which make the wide \sigma and the narrow f_0(980) as \eta'-like particles, which can have strong couplings to meson pairs through OZI violations. A coherent picture of the other I=0 scalar mesons spectra within this mixing scheme is shortly discussed. We also expect the a_0(980) to be the lowest isovector \bar ud state, and the K^*_0(1430) its \bar ds partner.
|
1403.7804
|
Martin Schumacher
|
Martin Schumacher
|
Nambu's Nobel Prize, the $\sigma$ meson and the mass of visible matter
|
19 pages, 2 figures, topical review
|
Ann. Phys. (Berlin) 526, 215 (2014)
|
10.1002/andp.201400077
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The electroweak Higgs boson has been discovered in ongoing experiments at the
LHC, leading to a mass of this particle of 126 GeV. This Higgs boson mediates
the generation of mass for elementary particles, including the mass of
elementary (current) quarks. These current-quark masses leave 98% of the mass
of the atom unexplained. This large fraction is mediated by strong interaction,
where instead of the Higgs boson the $\sigma$ meson is the mediating particle.
Though already discovered in 1957 by Schwinger, the $\sigma$ meson has been
integrated out in many theories of hadron properties because it had not been
observed and was doubted to exist. With the observation of the $\sigma$ meson
in recent experiments on Compton scattering by the nucleon at MAMI (Mainz) it
has become timely to review the status of experimental and theoretical
researches on this topic.
|
[
{
"created": "Sun, 30 Mar 2014 19:33:27 GMT",
"version": "v1"
},
{
"created": "Fri, 27 Jun 2014 14:28:40 GMT",
"version": "v2"
},
{
"created": "Wed, 5 Nov 2014 09:26:47 GMT",
"version": "v3"
}
] |
2015-06-19
|
[
[
"Schumacher",
"Martin",
""
]
] |
The electroweak Higgs boson has been discovered in ongoing experiments at the LHC, leading to a mass of this particle of 126 GeV. This Higgs boson mediates the generation of mass for elementary particles, including the mass of elementary (current) quarks. These current-quark masses leave 98% of the mass of the atom unexplained. This large fraction is mediated by strong interaction, where instead of the Higgs boson the $\sigma$ meson is the mediating particle. Though already discovered in 1957 by Schwinger, the $\sigma$ meson has been integrated out in many theories of hadron properties because it had not been observed and was doubted to exist. With the observation of the $\sigma$ meson in recent experiments on Compton scattering by the nucleon at MAMI (Mainz) it has become timely to review the status of experimental and theoretical researches on this topic.
|
hep-ph/0009039
|
Yurii Surovtsev
|
Yu.S.Surovtsev, D.Krupa and M.Nagy
|
Model-Independent Confirmation of the $\sigma$-Meson below 1 GeV and
Indication for the $f_0(1500)$ Glueball
|
15 pages, 5 figures, LaTex; Talk given at the Sixth International
Workshop on Production, Properties and Interaction oh Mesons "MESON'2000"
(Cracow, Poland, 19-23 May 2000)
|
Acta Phys.Polon. B31 (2000) 2697-2701
| null | null |
hep-ph
| null |
In the model-independent approach consisting in the immediate application to
the analysis of experimental data of such general principles as analyticity and
unitarity, a confirmation of the $\sigma$-meson at $\sim$ 665 MeV and an
indication for the glueball nature of the $f_0(1500)$ state are obtained on the
basis of a simultaneous description of the isoscalar s-wave channel of the
$\pi\pi$ scattering (from the threshold up to 1.9 GeV) and of the $\pi\pi\to
K\bar{K}$ process (from the threshold to $\sim$ 1.4 GeV where the 2-channel
unitarity is valid). A parameterless description of the $\pi\pi$ background is
first given by allowance for the left-hand branch-point in the proper
uniformizing variable. It is shown that the large $\pi\pi$-background, usually
obtained, combines, in reality, the influence of the left-hand branch-point and
the contribution of a very wide resonance at $\sim$ 665 MeV. The coupling
constants of the observed states with the $\pi\pi$ and $K\bar{K}$ systems and
lengths of the $\pi\pi$ and $K\bar{K}$ scattering are obtained.
|
[
{
"created": "Mon, 4 Sep 2000 16:14:39 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Surovtsev",
"Yu. S.",
""
],
[
"Krupa",
"D.",
""
],
[
"Nagy",
"M.",
""
]
] |
In the model-independent approach consisting in the immediate application to the analysis of experimental data of such general principles as analyticity and unitarity, a confirmation of the $\sigma$-meson at $\sim$ 665 MeV and an indication for the glueball nature of the $f_0(1500)$ state are obtained on the basis of a simultaneous description of the isoscalar s-wave channel of the $\pi\pi$ scattering (from the threshold up to 1.9 GeV) and of the $\pi\pi\to K\bar{K}$ process (from the threshold to $\sim$ 1.4 GeV where the 2-channel unitarity is valid). A parameterless description of the $\pi\pi$ background is first given by allowance for the left-hand branch-point in the proper uniformizing variable. It is shown that the large $\pi\pi$-background, usually obtained, combines, in reality, the influence of the left-hand branch-point and the contribution of a very wide resonance at $\sim$ 665 MeV. The coupling constants of the observed states with the $\pi\pi$ and $K\bar{K}$ systems and lengths of the $\pi\pi$ and $K\bar{K}$ scattering are obtained.
|
1007.4841
|
Elizabeth Rodriguez Querts
|
H. Perez Rojas and E. Rodriguez Querts
|
The photon magnetic moment has not a perpendicular component and is
fully paramagnetic
| null | null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Our paper Phys. Rev. D \textbf{79}, 093002 (2009), in which it was shown the
paramagnetic behavior of photons propagating in magnetized vacuum, is
criticized in Phys. Rev. D \textbf{81}, 105019, (2010) and even claimed that
the photon has a diamagnetic component. Here it is shown that such criticism is
inadequate and that the alleged "perpendicular component" is due to a mistake
in differentiating a vanishing term with regard to the magnetic field $B$, or
either by mistaking the derivative of a scalar product as that of a dyadic
product. A discussion on the physical side of the problem is also made.
|
[
{
"created": "Tue, 27 Jul 2010 23:03:28 GMT",
"version": "v1"
},
{
"created": "Tue, 31 Aug 2010 20:32:08 GMT",
"version": "v2"
}
] |
2010-09-02
|
[
[
"Rojas",
"H. Perez",
""
],
[
"Querts",
"E. Rodriguez",
""
]
] |
Our paper Phys. Rev. D \textbf{79}, 093002 (2009), in which it was shown the paramagnetic behavior of photons propagating in magnetized vacuum, is criticized in Phys. Rev. D \textbf{81}, 105019, (2010) and even claimed that the photon has a diamagnetic component. Here it is shown that such criticism is inadequate and that the alleged "perpendicular component" is due to a mistake in differentiating a vanishing term with regard to the magnetic field $B$, or either by mistaking the derivative of a scalar product as that of a dyadic product. A discussion on the physical side of the problem is also made.
|
2012.13291
|
Christopher W. Murphy
|
Christopher W. Murphy
|
Low-Energy Effective Field Theory below the Electroweak Scale:
Dimension-8 Operators
|
29 pages, 20 tables; v3: minor typos corrected
| null |
10.1007/JHEP04(2021)101
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We construct a complete basis of dimension-8 operators in the Low-Energy
Effective Field Theory below the Electroweak Scale (LEFT). We find there are
35058 dimension-8 operators in the LEFT for two generations of up-type quarks
and three generations of down-type quarks, charged leptons, and left-handed
neutrinos. The existence of this operator basis is a necessary prerequisite for
matching to the Standard Model Effective Field Theory at the dimension-8 level.
|
[
{
"created": "Thu, 24 Dec 2020 15:22:13 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Apr 2021 17:48:02 GMT",
"version": "v2"
},
{
"created": "Sun, 19 Dec 2021 14:01:09 GMT",
"version": "v3"
}
] |
2021-12-21
|
[
[
"Murphy",
"Christopher W.",
""
]
] |
We construct a complete basis of dimension-8 operators in the Low-Energy Effective Field Theory below the Electroweak Scale (LEFT). We find there are 35058 dimension-8 operators in the LEFT for two generations of up-type quarks and three generations of down-type quarks, charged leptons, and left-handed neutrinos. The existence of this operator basis is a necessary prerequisite for matching to the Standard Model Effective Field Theory at the dimension-8 level.
|
2004.01359
|
Weihua Yang
|
Kai-bao Chen, Wei-hua Yang
|
Parity violating semi-inclusive deeply inelastic scattering at the
Electron-Ion Collider
|
14 pages, 1 figures
| null |
10.1103/PhysRevD.101.096017
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a systematic calculation of the current jet production
semi-inclusive deeply inelastic scattering process at the Electron-Ion Collider
energy. Contributions from weak interactions are considered which give rise to
parity violating effects. We consider the general form of the polarized
electron beam scattering off the polarized target which has spin 1. The
calculations are carried out up to twist-3 level in the quantum chromodynamics
parton model by applying the collinear expansion where multiple gluon
scattering is taken into account and gauge links are obtained automatically. We
present complete results for structure functions and spin/azimuthal asymmetries
in terms of the gauge invariant transverse momentum dependent parton
distribution functions. Both the unpolarized and the polarized electron beam
cases correspond to 24 azimuthal asymmetries, in which 6 of them appear at the
leading twist, while 18 of them contribute at twist-3 level. In addition we
also calculate the parity-violating asymmetries which arise from the
interference of the electromagnetic and weak interactions.
|
[
{
"created": "Fri, 3 Apr 2020 03:32:40 GMT",
"version": "v1"
},
{
"created": "Sun, 12 Jul 2020 02:56:15 GMT",
"version": "v2"
}
] |
2020-07-14
|
[
[
"Chen",
"Kai-bao",
""
],
[
"Yang",
"Wei-hua",
""
]
] |
We present a systematic calculation of the current jet production semi-inclusive deeply inelastic scattering process at the Electron-Ion Collider energy. Contributions from weak interactions are considered which give rise to parity violating effects. We consider the general form of the polarized electron beam scattering off the polarized target which has spin 1. The calculations are carried out up to twist-3 level in the quantum chromodynamics parton model by applying the collinear expansion where multiple gluon scattering is taken into account and gauge links are obtained automatically. We present complete results for structure functions and spin/azimuthal asymmetries in terms of the gauge invariant transverse momentum dependent parton distribution functions. Both the unpolarized and the polarized electron beam cases correspond to 24 azimuthal asymmetries, in which 6 of them appear at the leading twist, while 18 of them contribute at twist-3 level. In addition we also calculate the parity-violating asymmetries which arise from the interference of the electromagnetic and weak interactions.
|
hep-ph/0308215
|
Johan Rathsman
|
S. Moretti (Southampton) and J. Rathsman (Uppsala)
|
Pair production of charged Higgs bosons in association with bottom quark
pairs at the Large Hadron Collider
|
27 pages, 8 figures, references added; substantial revision
(additional unitarity contraints, tau-decay effects, improved selection),
conclusions unchanged, accepted for publication in EPJC
|
Eur.Phys.J. C33 (2004) 41-52
|
10.1140/epjc/s2003-01529-1
|
SHEP-03-07, TSL/ISV-2003-0271
|
hep-ph
| null |
We study the process gg -> b bbar H+ H- at large tan(beta), where it
represents the dominant production mode of charged Higgs boson pairs in a Type
II 2-Higgs Doublet Model, including the Minimal Supersymmetric Standard Model.
The ability to select this signal would in principle enable the measurements of
some triple-Higgs couplings, which in turn would help understanding the
structure of the extended Higgs sector. We outline a selection procedure that
should aid in disentangling the Higgs signal from the main irreducible
background. This exploits a signature made up by `four b-quark jets, two
light-quark jets, a tau-lepton and missing energy'. While, for tan(beta) \gsim
30 and over a significant M_H+/- range above the top mass, a small signal
emerges already at the Large Hadron Collider after 100 fb^{-1}, ten times as
much luminosity would be needed to perform accurate measurements of Higgs
parameters in the above final state, rendering this channel a primary candidate
to benefit from the so-called `Super' Large Hadron Collider option, for which a
tenfold increase in instantaneous luminosity is currently being considered.
|
[
{
"created": "Thu, 21 Aug 2003 07:28:35 GMT",
"version": "v1"
},
{
"created": "Fri, 22 Aug 2003 14:12:42 GMT",
"version": "v2"
},
{
"created": "Wed, 3 Sep 2003 11:09:09 GMT",
"version": "v3"
},
{
"created": "Thu, 4 Dec 2003 14:48:21 GMT",
"version": "v4"
}
] |
2009-11-10
|
[
[
"Moretti",
"S.",
"",
"Southampton"
],
[
"Rathsman",
"J.",
"",
"Uppsala"
]
] |
We study the process gg -> b bbar H+ H- at large tan(beta), where it represents the dominant production mode of charged Higgs boson pairs in a Type II 2-Higgs Doublet Model, including the Minimal Supersymmetric Standard Model. The ability to select this signal would in principle enable the measurements of some triple-Higgs couplings, which in turn would help understanding the structure of the extended Higgs sector. We outline a selection procedure that should aid in disentangling the Higgs signal from the main irreducible background. This exploits a signature made up by `four b-quark jets, two light-quark jets, a tau-lepton and missing energy'. While, for tan(beta) \gsim 30 and over a significant M_H+/- range above the top mass, a small signal emerges already at the Large Hadron Collider after 100 fb^{-1}, ten times as much luminosity would be needed to perform accurate measurements of Higgs parameters in the above final state, rendering this channel a primary candidate to benefit from the so-called `Super' Large Hadron Collider option, for which a tenfold increase in instantaneous luminosity is currently being considered.
|
hep-ph/9806461
|
Sakellariadou Mairi
|
Mairi Sakellariadou and Nikos Tetradis
|
Spectrum of Cosmological Perturbations from Multiple-Stage Inflation
|
LaTeX file (24 pages), 4 figures and a style file. Revised version.
Submitted to Physical Review D
| null | null | null |
hep-ph astro-ph
| null |
Within the context of supersymmetric hybrid inflation, we study a
multiple-stage inflationary scenario that can generate a primordial spectrum of
adiabatic density perturbations with a break at $k_b \simeq 0.05 h Mpc^{-1}$.
The presence of such a break is supported by the APM galaxy survey data. We
consider a specific model within this scenario and confront it with
observational data. We reproduce the angular power spectrum of CMB
anisotropies, and also account for the break in the power spectrum of galaxy
clustering. In addition, we find a value for $\sigma_8$ in agreement with the
one deduced from observations. A characteristic property of the spectrum is a
drop of the spectral index from $n \simeq 1$ to $n \sim 0.6$ at $k \sim k_b$.
|
[
{
"created": "Wed, 24 Jun 1998 10:39:28 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Jun 1999 15:02:54 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Sakellariadou",
"Mairi",
""
],
[
"Tetradis",
"Nikos",
""
]
] |
Within the context of supersymmetric hybrid inflation, we study a multiple-stage inflationary scenario that can generate a primordial spectrum of adiabatic density perturbations with a break at $k_b \simeq 0.05 h Mpc^{-1}$. The presence of such a break is supported by the APM galaxy survey data. We consider a specific model within this scenario and confront it with observational data. We reproduce the angular power spectrum of CMB anisotropies, and also account for the break in the power spectrum of galaxy clustering. In addition, we find a value for $\sigma_8$ in agreement with the one deduced from observations. A characteristic property of the spectrum is a drop of the spectral index from $n \simeq 1$ to $n \sim 0.6$ at $k \sim k_b$.
|
2112.14201
|
Sanjib Kumar Agarwalla
|
Anuj Kumar Upadhyay, Anil Kumar, Sanjib Kumar Agarwalla, Amol Dighe
|
Probing dark matter inside Earth using atmospheric neutrino oscillations
at INO-ICAL
|
10 pages, 6 figures, 1 table, and 1 appendix. Title and abstract
modified. Table 1, Figure 5, and an Appendix added. Text has been added and
rearranged for clarification. This version has the same contents as in the
article published in Physical Review D
| null | null |
IP/BBSR/2021-12, TIFR/TH/21-22
|
hep-ph hep-ex physics.ins-det
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The interior of Earth's core can be explored using weak interactions of
atmospheric neutrinos. This would complement gravitational and seismic
measurements, paving the way for multimessenger tomography of Earth.
Oscillations of atmospheric neutrinos passing through Earth are affected by the
ambient electron density. We demonstrate that atmospheric neutrinos can probe
the possible existence of dark matter inside Earth's core in a unique way - by
measuring the amount of baryonic matter using neutrino oscillations. We find
that a detector like ICAL at INO with muon charge identification capability can
be sensitive to dark matter with $\sim5\%-6\%$ mass of Earth, at 1$\sigma$
level with 500 kt$\cdot$yr exposure. We show that while it will not be possible
to identify the dark matter profile using neutrino oscillation experiments, the
baryonic matter profile inside the core can be probed with atmospheric
neutrinos.
|
[
{
"created": "Tue, 28 Dec 2021 16:03:16 GMT",
"version": "v1"
},
{
"created": "Thu, 24 Aug 2023 19:58:04 GMT",
"version": "v2"
}
] |
2023-08-28
|
[
[
"Upadhyay",
"Anuj Kumar",
""
],
[
"Kumar",
"Anil",
""
],
[
"Agarwalla",
"Sanjib Kumar",
""
],
[
"Dighe",
"Amol",
""
]
] |
The interior of Earth's core can be explored using weak interactions of atmospheric neutrinos. This would complement gravitational and seismic measurements, paving the way for multimessenger tomography of Earth. Oscillations of atmospheric neutrinos passing through Earth are affected by the ambient electron density. We demonstrate that atmospheric neutrinos can probe the possible existence of dark matter inside Earth's core in a unique way - by measuring the amount of baryonic matter using neutrino oscillations. We find that a detector like ICAL at INO with muon charge identification capability can be sensitive to dark matter with $\sim5\%-6\%$ mass of Earth, at 1$\sigma$ level with 500 kt$\cdot$yr exposure. We show that while it will not be possible to identify the dark matter profile using neutrino oscillation experiments, the baryonic matter profile inside the core can be probed with atmospheric neutrinos.
|
hep-ph/0408099
|
Gi-Chol Cho
|
Gi-Chol Cho and Aya Omote (Ochanomizu University)
|
Search for a light extra gauge boson in Littlest Higgs model at a linear
collider
|
5 pages, 3 figures, version to appear in Phys.Rev.D
|
Phys.Rev. D70 (2004) 057701
|
10.1103/PhysRevD.70.057701
|
OCHA-PP-231
|
hep-ph hep-ex
| null |
Littlest Higgs model predicts some extra particles beyond the Standard Model.
Among them, an extra neutral gauge boson A_H is lightest and its mass could be
a few hundred GeV. We study production and decay of A_H at future e^+ e^- inear
collider and compare them with those of Z' bosons in supersymmetric (SUSY) E_6
models. We find that, if the extra gauge boson mass is smaller than \sqrt{s} of
the linear collider, the forward-backward asymmetries of b- and c-quarks at the
A_H pole differ significantly from those given by the Z' bosons, and are useful
to test the littlest Higgs model and SUSY E_6 models.
|
[
{
"created": "Fri, 6 Aug 2004 23:31:31 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Aug 2004 06:06:17 GMT",
"version": "v2"
}
] |
2009-11-10
|
[
[
"Cho",
"Gi-Chol",
"",
"Ochanomizu University"
],
[
"Omote",
"Aya",
"",
"Ochanomizu University"
]
] |
Littlest Higgs model predicts some extra particles beyond the Standard Model. Among them, an extra neutral gauge boson A_H is lightest and its mass could be a few hundred GeV. We study production and decay of A_H at future e^+ e^- inear collider and compare them with those of Z' bosons in supersymmetric (SUSY) E_6 models. We find that, if the extra gauge boson mass is smaller than \sqrt{s} of the linear collider, the forward-backward asymmetries of b- and c-quarks at the A_H pole differ significantly from those given by the Z' bosons, and are useful to test the littlest Higgs model and SUSY E_6 models.
|
hep-ph/0011292
|
Hans C. Eggers
|
B. Buschbeck and H.C. Eggers
|
Multiplicity dependence of Bose-Einstein correlations in
antiproton-proton reactions: a discussion of possible origins
|
9th Workshop on Multiparticle Production (Torino), 12 pages latex,
incl 7 figs and espcrc2.sty
|
Nucl.Phys.Proc.Suppl.92:235-246,2001
|
10.1016/S0920-5632(00)01038-0
|
HEPHY--PUB 732/2000, STPHY 46/00
|
hep-ph
| null |
The observed pronounced multiplicity dependence of correlation functions in
hadron-hadron reactions and in particular of Bose-Einstein correlations
provides information about underlying physics. We discuss in this contribution
several interpretations, giving special attention to the string model for
Bose-Einstein correlations of Andersson and Hofmann, as well as the core-halo
picture of Csorgo, Lorstad and Zimanyi.
|
[
{
"created": "Thu, 23 Nov 2000 10:38:45 GMT",
"version": "v1"
}
] |
2011-08-17
|
[
[
"Buschbeck",
"B.",
""
],
[
"Eggers",
"H. C.",
""
]
] |
The observed pronounced multiplicity dependence of correlation functions in hadron-hadron reactions and in particular of Bose-Einstein correlations provides information about underlying physics. We discuss in this contribution several interpretations, giving special attention to the string model for Bose-Einstein correlations of Andersson and Hofmann, as well as the core-halo picture of Csorgo, Lorstad and Zimanyi.
|
1003.3461
|
David McKeen
|
Qing-Hong Cao, David McKeen, Jonathan L. Rosner, Gabe Shaughnessy, and
Carlos E. M. Wagner
|
Forward-Backward Asymmetry of Top Quark Pair Production
|
46 pages, 20 figures
|
Phys.Rev.D81:114004,2010
|
10.1103/PhysRevD.81.114004
|
ANL-HEP-PR-09-113, EFI-09-37, NUHEP-TH/10-01
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We adopt a Markov Chain Monte Carlo method to examine various new physics
models which can generate the forward-backward asymmetry in top quark pair
production observed at the Tevatron by the CDF Collaboration. We study the
following new physics models: (1) exotic gluon $G^\prime$, (2) extra $Z^\prime$
boson with flavor-conserving interaction, (3) extra $Z^\prime$ with
flavor-violating $u$-$t$-$Z^\prime$ interaction, (4) extra $W^\prime$ with
flavor-violating $d$-$t$-$W^\prime$ interaction, and (5) extra scalars $S$ and
$S^\pm$ with flavor-violating $u$-$t$-$S$ and $d$-$t$-$S^\pm$ interactions.
After combining the forward-backward asymmetry with the measurement of the top
pair production cross section and the $t\bar{t}$ invariant mass distribution at
the Tevatron, we find that an axial vector exotic gluon $G^\prime$ of mass
about $1 {\rm TeV}$ or $2 {\rm TeV}$ or a $W^\prime$ of mass about $2 {\rm
TeV}$ offer an improvement over the Standard Model. The other models considered
do not fit the data significantly better than the Standard Model. We also
emphasize a few points which have been long ignored in the literature for new
physics searches: (1) heavy resonance width effects, (2) renormalization scale
dependence, and (3) NLO corrections to the $t\bar{t}$ invariant mass spectrum.
We argue that these three effects are crucial to test or exclude new physics
effects in the top quark pair asymmetry.
|
[
{
"created": "Wed, 17 Mar 2010 20:22:32 GMT",
"version": "v1"
}
] |
2014-11-20
|
[
[
"Cao",
"Qing-Hong",
""
],
[
"McKeen",
"David",
""
],
[
"Rosner",
"Jonathan L.",
""
],
[
"Shaughnessy",
"Gabe",
""
],
[
"Wagner",
"Carlos E. M.",
""
]
] |
We adopt a Markov Chain Monte Carlo method to examine various new physics models which can generate the forward-backward asymmetry in top quark pair production observed at the Tevatron by the CDF Collaboration. We study the following new physics models: (1) exotic gluon $G^\prime$, (2) extra $Z^\prime$ boson with flavor-conserving interaction, (3) extra $Z^\prime$ with flavor-violating $u$-$t$-$Z^\prime$ interaction, (4) extra $W^\prime$ with flavor-violating $d$-$t$-$W^\prime$ interaction, and (5) extra scalars $S$ and $S^\pm$ with flavor-violating $u$-$t$-$S$ and $d$-$t$-$S^\pm$ interactions. After combining the forward-backward asymmetry with the measurement of the top pair production cross section and the $t\bar{t}$ invariant mass distribution at the Tevatron, we find that an axial vector exotic gluon $G^\prime$ of mass about $1 {\rm TeV}$ or $2 {\rm TeV}$ or a $W^\prime$ of mass about $2 {\rm TeV}$ offer an improvement over the Standard Model. The other models considered do not fit the data significantly better than the Standard Model. We also emphasize a few points which have been long ignored in the literature for new physics searches: (1) heavy resonance width effects, (2) renormalization scale dependence, and (3) NLO corrections to the $t\bar{t}$ invariant mass spectrum. We argue that these three effects are crucial to test or exclude new physics effects in the top quark pair asymmetry.
|
1507.06848
|
Alessandro Strumia
|
Giulio Maria Pelaggi, Alessandro Strumia, Saverio Vignali
|
Totally asymptotically free trinification
|
15 pages. The ancillary Mathematica file shows a sample of results.
v2: final version accepted by JHEP
| null | null |
IFUP-TH/2015
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Motivated by new ideas about the Higgs mass naturalness problem, we present
realistic TeV-scale extensions of the Standard Model, into the gauge group
SU(3)_L x SU(3)_R x SU(3)_c, such that all gauge, Yukawa and quartic couplings
can be extrapolated up to infinite energy. Three generations of chiral fermions
and Higgses are needed, as well as some extra fermion.
|
[
{
"created": "Fri, 24 Jul 2015 14:13:31 GMT",
"version": "v1"
},
{
"created": "Mon, 31 Aug 2015 11:14:40 GMT",
"version": "v2"
}
] |
2015-09-01
|
[
[
"Pelaggi",
"Giulio Maria",
""
],
[
"Strumia",
"Alessandro",
""
],
[
"Vignali",
"Saverio",
""
]
] |
Motivated by new ideas about the Higgs mass naturalness problem, we present realistic TeV-scale extensions of the Standard Model, into the gauge group SU(3)_L x SU(3)_R x SU(3)_c, such that all gauge, Yukawa and quartic couplings can be extrapolated up to infinite energy. Three generations of chiral fermions and Higgses are needed, as well as some extra fermion.
|
1311.0126
|
Amit Dutta Banik
|
Amit Dutta Banik, Debasish Majumdar
|
Extension of Minimal Fermionic Dark Matter Model : A Study with Two
Higgs Doublet Model
|
22 pages, 17 new png figures, Title changed, new references added,
major revision
| null |
10.1140/epjc/s10052-015-3589-0
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We explore a fermionic dark matter model with a possible extension of
Standard Model (SM) of particle physics into two Higgs doublet model. Higgs
doublets couple to the singlet fermionic dark matter (FDM) through a non
renormalisable coupling providing a new physics scale. We explore the viability
of such dark matter candidate and constrain the model parameter space by
collider serach, relic density of DM, direct detection measurements of
DM-nucleon scattreing cross-section and with the experimentally obtained
results from indirect search of dark matter.
|
[
{
"created": "Fri, 1 Nov 2013 09:27:14 GMT",
"version": "v1"
},
{
"created": "Thu, 28 May 2015 12:31:09 GMT",
"version": "v2"
}
] |
2022-12-14
|
[
[
"Banik",
"Amit Dutta",
""
],
[
"Majumdar",
"Debasish",
""
]
] |
We explore a fermionic dark matter model with a possible extension of Standard Model (SM) of particle physics into two Higgs doublet model. Higgs doublets couple to the singlet fermionic dark matter (FDM) through a non renormalisable coupling providing a new physics scale. We explore the viability of such dark matter candidate and constrain the model parameter space by collider serach, relic density of DM, direct detection measurements of DM-nucleon scattreing cross-section and with the experimentally obtained results from indirect search of dark matter.
|
1909.06150
|
Kazumasa Ohkuma
|
Zenro Hioki (U. Tokushima), Kazumasa Ohkuma (Okayama U. Science),
Akira Uejima (Okayama U. Science)
|
Effective Lagrangian Approach to Top Decay via Flavor Changing Neutral
Current
|
4 pages, 1 figure, 2 tables, Contribution to the Proceedings of the
XXIX International Symposium on Lepton Photon Interactions at High Energies -
LeptonPhoton2019, 5-10 August 2019, Toronto, Canada
| null | null | null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study possible non-standard $tuZ$ and $tcZ$ couplings, which induce
flavor-changing neutral-current decays of the top quark, in the
effective-Lagrangian framework. The corresponding interaction Lagrangian comes
from several $SU(3) \times SU(2) \times U(1)$ invariant dimension-6 effective
operators, and it includes four independent complex-number coupling constants.
Constraints on those non-standard coupling constants in each interaction are
derived by using the present experimental limits of the branching fractions for
$t \to u Z$ and $t \to c Z$ processes. Expected improvements of the constraints
at future facilities are discussed as well. It is also pointed out that some
correlations hold among those constrained coupling constants.
|
[
{
"created": "Fri, 13 Sep 2019 11:23:35 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Sep 2019 03:16:15 GMT",
"version": "v2"
}
] |
2019-09-17
|
[
[
"Hioki",
"Zenro",
"",
"U. Tokushima"
],
[
"Ohkuma",
"Kazumasa",
"",
"Okayama U. Science"
],
[
"Uejima",
"Akira",
"",
"Okayama U. Science"
]
] |
We study possible non-standard $tuZ$ and $tcZ$ couplings, which induce flavor-changing neutral-current decays of the top quark, in the effective-Lagrangian framework. The corresponding interaction Lagrangian comes from several $SU(3) \times SU(2) \times U(1)$ invariant dimension-6 effective operators, and it includes four independent complex-number coupling constants. Constraints on those non-standard coupling constants in each interaction are derived by using the present experimental limits of the branching fractions for $t \to u Z$ and $t \to c Z$ processes. Expected improvements of the constraints at future facilities are discussed as well. It is also pointed out that some correlations hold among those constrained coupling constants.
|
hep-ph/0011070
|
Yoshio Koide
|
Yoshio Koide and Hideo Fusaoka
|
Evolution of the Yukawa coupling constants and seesaw operators in the
universal seesaw model
|
21 pages, RevTex, 10 figures
|
Phys.Rev.D64:053014,2001
|
10.1103/PhysRevD.64.053014
|
US-00-10 and AMU-00-10
|
hep-ph
| null |
The general features of the evolution of the Yukawa coupling constants and
seesaw operators in the universal seesaw model with det M_F=0 are investigated.
Especially, it is checked whether the model causes bursts of Yukawa coupling
constants, because in the model not only the magnitude of the Yukawa coupling
constant (Y_L^u)_{33} in the up-quark sector but also that of (Y_L^d)_{33} in
the down-quark sector is of the order of one, i.e., (Y_L^u)_{33} \sim
(Y_L^d)_{33} \sim 1. The requirement that the model should be calculable
perturbatively puts some constraints on the values of the intermediate mass
scales and tan\beta (in the SUSY model).
|
[
{
"created": "Mon, 6 Nov 2000 11:55:19 GMT",
"version": "v1"
},
{
"created": "Fri, 18 May 2001 11:55:49 GMT",
"version": "v2"
}
] |
2014-11-17
|
[
[
"Koide",
"Yoshio",
""
],
[
"Fusaoka",
"Hideo",
""
]
] |
The general features of the evolution of the Yukawa coupling constants and seesaw operators in the universal seesaw model with det M_F=0 are investigated. Especially, it is checked whether the model causes bursts of Yukawa coupling constants, because in the model not only the magnitude of the Yukawa coupling constant (Y_L^u)_{33} in the up-quark sector but also that of (Y_L^d)_{33} in the down-quark sector is of the order of one, i.e., (Y_L^u)_{33} \sim (Y_L^d)_{33} \sim 1. The requirement that the model should be calculable perturbatively puts some constraints on the values of the intermediate mass scales and tan\beta (in the SUSY model).
|
1601.01666
|
Nikolaos Kidonakis
|
Nikolaos Kidonakis
|
Three-loop cusp anomalous dimension and a conjecture for $n$ loops
|
16 pages, 5 figures; a new section has been added and several other
additions/changes made in v2
|
Int. J. Mod. Phys. A 31, 1650076 (2016)
|
10.1142/S0217751X16500767
| null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
I present analytical expressions for the cusp anomalous dimension in QCD
through three loops in terms of elementary functions and ordinary
polylogarithms. I observe interesting relations between the results at
different loops and provide a conjecture for the $n$-loop cusp anomalous
dimension in terms of the lower-loop results. I also present numerical results
and simple approximate formulas for the cusp anomalous dimension relevant to
top-quark production.
|
[
{
"created": "Thu, 7 Jan 2016 20:56:44 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Feb 2016 20:46:43 GMT",
"version": "v2"
}
] |
2016-05-25
|
[
[
"Kidonakis",
"Nikolaos",
""
]
] |
I present analytical expressions for the cusp anomalous dimension in QCD through three loops in terms of elementary functions and ordinary polylogarithms. I observe interesting relations between the results at different loops and provide a conjecture for the $n$-loop cusp anomalous dimension in terms of the lower-loop results. I also present numerical results and simple approximate formulas for the cusp anomalous dimension relevant to top-quark production.
|
1205.2695
|
Vincenzo Cirigliano
|
Vincenzo Cirigliano, Michael L. Graesser, Grigory Ovanesyan
|
WIMP-nucleus scattering in chiral effective theory
|
23 pages, 6 figures, 1 table
| null |
10.1007/JHEP10(2012)025
| null |
hep-ph astro-ph.CO nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss long-distance QCD corrections to the WIMP-nucleon(s) interactions
in the framework of chiral effective theory. For scalar-mediated WIMP-quark
interactions, we calculate all the next-to-leading-order corrections to the
WIMP-nucleus elastic cross-section, including two-nucleon amplitudes and
recoil-energy dependent shifts to the single-nucleon scalar form factors. As a
consequence, the scalar-mediated WIMP-nucleus cross-section cannot be
parameterized in terms of just two quantities, namely the neutron and proton
scalar form factors at zero momentum transfer, but additional parameters
appear, depending on the short-distance WIMP-quark interaction. Moreover,
multiplicative factorization of the cross-section into particle, nuclear and
astro-particle parts is violated. In practice, while the new effects are of the
natural size expected by chiral power counting, they become very important in
those regions of parameter space where the leading order WIMP-nucleus amplitude
is suppressed, including the so-called "isospin-violating dark matter" regime.
In these regions of parameter space we find order-of-magnitude corrections to
the total scattering rates and qualitative changes to the shape of recoil
spectra.
|
[
{
"created": "Fri, 11 May 2012 20:00:01 GMT",
"version": "v1"
}
] |
2015-06-05
|
[
[
"Cirigliano",
"Vincenzo",
""
],
[
"Graesser",
"Michael L.",
""
],
[
"Ovanesyan",
"Grigory",
""
]
] |
We discuss long-distance QCD corrections to the WIMP-nucleon(s) interactions in the framework of chiral effective theory. For scalar-mediated WIMP-quark interactions, we calculate all the next-to-leading-order corrections to the WIMP-nucleus elastic cross-section, including two-nucleon amplitudes and recoil-energy dependent shifts to the single-nucleon scalar form factors. As a consequence, the scalar-mediated WIMP-nucleus cross-section cannot be parameterized in terms of just two quantities, namely the neutron and proton scalar form factors at zero momentum transfer, but additional parameters appear, depending on the short-distance WIMP-quark interaction. Moreover, multiplicative factorization of the cross-section into particle, nuclear and astro-particle parts is violated. In practice, while the new effects are of the natural size expected by chiral power counting, they become very important in those regions of parameter space where the leading order WIMP-nucleus amplitude is suppressed, including the so-called "isospin-violating dark matter" regime. In these regions of parameter space we find order-of-magnitude corrections to the total scattering rates and qualitative changes to the shape of recoil spectra.
|
1806.10996
|
Sergei Demidov
|
S.V. Demidov, B.R. Farkhtdinov
|
Numerical study of multiparticle scattering in $\lambda\phi^4$ theory
|
32 pages, 18 figures, journal version
| null |
10.1007/JHEP11(2018)068
|
INR-TH-2018-016
|
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study numerically classical collisions of waves in $\lambda\phi^4$ theory.
These processes correspond to multiparticle scattering in the semiclassical
regime. Parametrizing initial and final wavepackets by energy $E$ and particle
numbers $N_{i}$, $N_{f}$ we find classically allowed region in the parameter
space. We describe properties of the scattering solutions at the boundary of
the classically allowed region. We comment on the implications of our results
for multiparticle production in the quantum regime.
|
[
{
"created": "Thu, 28 Jun 2018 14:18:51 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Dec 2018 12:24:50 GMT",
"version": "v2"
}
] |
2018-12-10
|
[
[
"Demidov",
"S. V.",
""
],
[
"Farkhtdinov",
"B. R.",
""
]
] |
We study numerically classical collisions of waves in $\lambda\phi^4$ theory. These processes correspond to multiparticle scattering in the semiclassical regime. Parametrizing initial and final wavepackets by energy $E$ and particle numbers $N_{i}$, $N_{f}$ we find classically allowed region in the parameter space. We describe properties of the scattering solutions at the boundary of the classically allowed region. We comment on the implications of our results for multiparticle production in the quantum regime.
|
hep-ph/0305319
|
Fuminobu Takahashi
|
Masahiro Kawasaki and Fuminobu Takahashi
|
Inflation model with lower multipoles of the CMB suppressed
|
4 pages, 1 figure. Some references and 1 figure are added
|
Phys.Lett. B570 (2003) 151-153
|
10.1016/j.physletb.2003.08.005
|
RESCEU-18/03
|
hep-ph astro-ph
| null |
The recent observation of the cosmic microwave background anisotropy by the
WMAP confirmed that the lower multipoles are considerably suppressed. From the
standpoint of the cosmic variance, it is nothing but a statistical accident.
Alternatively, one can attribute the deficit of fluctuation on the large scale
to the cosmic history, which might be explained in the context of the
inflationary physics. In this paper, we show that it is possible to explain the
suppressed lower multipoles in the hybrid new inflation model.
|
[
{
"created": "Thu, 29 May 2003 10:53:34 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Jul 2003 05:31:57 GMT",
"version": "v2"
}
] |
2009-11-10
|
[
[
"Kawasaki",
"Masahiro",
""
],
[
"Takahashi",
"Fuminobu",
""
]
] |
The recent observation of the cosmic microwave background anisotropy by the WMAP confirmed that the lower multipoles are considerably suppressed. From the standpoint of the cosmic variance, it is nothing but a statistical accident. Alternatively, one can attribute the deficit of fluctuation on the large scale to the cosmic history, which might be explained in the context of the inflationary physics. In this paper, we show that it is possible to explain the suppressed lower multipoles in the hybrid new inflation model.
|
1604.04627
|
Ethan Neil
|
Graham D. Kribs and Ethan T. Neil
|
Review of strongly-coupled composite dark matter models and lattice
simulations
|
34 pages, 3 figures. Invited review for IJMPA special issue "Lattice
gauge theories beyond QCD."
| null |
10.1142/S0217751X16430041
| null |
hep-ph astro-ph.CO hep-lat
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We review models of new physics in which dark matter arises as a composite
bound state from a confining strongly-coupled non-Abelian gauge theory. We
discuss several qualitatively distinct classes of composite candidates,
including dark mesons, dark baryons, and dark glueballs. We highlight some of
the promising strategies for direct detection, especially through dark moments,
using the symmetries and properties of the composite description to identify
the operators that dominate the interactions of dark matter with matter, as
well as dark matter self-interactions. We briefly discuss the implications of
these theories at colliders, especially the (potentially novel) phenomenology
of dark mesons in various regimes of the models. Throughout the review, we
highlight the use of lattice calculations in the study of these
strongly-coupled theories, to obtain precise quantitative predictions and new
insights into the dynamics.
|
[
{
"created": "Fri, 15 Apr 2016 20:00:01 GMT",
"version": "v1"
}
] |
2016-08-24
|
[
[
"Kribs",
"Graham D.",
""
],
[
"Neil",
"Ethan T.",
""
]
] |
We review models of new physics in which dark matter arises as a composite bound state from a confining strongly-coupled non-Abelian gauge theory. We discuss several qualitatively distinct classes of composite candidates, including dark mesons, dark baryons, and dark glueballs. We highlight some of the promising strategies for direct detection, especially through dark moments, using the symmetries and properties of the composite description to identify the operators that dominate the interactions of dark matter with matter, as well as dark matter self-interactions. We briefly discuss the implications of these theories at colliders, especially the (potentially novel) phenomenology of dark mesons in various regimes of the models. Throughout the review, we highlight the use of lattice calculations in the study of these strongly-coupled theories, to obtain precise quantitative predictions and new insights into the dynamics.
|
hep-ph/9907395
|
Thomas G. Rizzo
|
Thomas G. Rizzo
|
Polarization Asymmetries in $\gamma e$ Collisions and Triple Gauge Boson
Couplings Revisited
|
5 pages, 4 figs, LaTex, Talk given at the World-Wide Study of Physics
and Detectors for Future Linear Colliders(LCWS99}, Sitges, Barcelona, Spain,
28 April-5 May 1999
| null | null |
SLAC-PUB-8192
|
hep-ph
| null |
The capability of the NLC run in the $\gamma e$ collision mode to probe the
CP-conserving $\gamma WW$ and $\gamma ZZ$ anomalous couplings through the use
of the polarization asymmetry is reviewed. When combined with other
measurements, very strong constraints on both varieties of anomalous couplings
can be obtained. We show that these bounds are complementary to those that can
be extracted from data taken at the LHC.
|
[
{
"created": "Fri, 16 Jul 1999 16:57:43 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Rizzo",
"Thomas G.",
""
]
] |
The capability of the NLC run in the $\gamma e$ collision mode to probe the CP-conserving $\gamma WW$ and $\gamma ZZ$ anomalous couplings through the use of the polarization asymmetry is reviewed. When combined with other measurements, very strong constraints on both varieties of anomalous couplings can be obtained. We show that these bounds are complementary to those that can be extracted from data taken at the LHC.
|
2008.05462
|
Wolfgang Sch\"afer
|
Izabela Babiarz, Roman Pasechnik, Wolfgang Sch\"afer, Antoni Szczurek
|
Central exclusive production of scalar and pseudoscalar charmonia in the
light-front $k_T$-factorization approach
|
21 pages, 11 figures, to appear in Phys. Rev. D, Sudakov form factor
corrected, additional model for unintegrated glue included
|
Phys. Rev. D 102, 114028 (2020)
|
10.1103/PhysRevD.102.114028
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study exclusive production of scalar $\chi_{c0}\equiv \chi_c(0^{++})$ and
pseudoscalar $\eta_c$ charmonia states in proton-proton collisions at the LHC
energies. The amplitudes for $gg \to \chi_{c0}$ as well as for $gg \to \eta_c$
mechanisms are derived in the $k_{T}$-factorization approach. The $p p \to p p
\eta_c$ reaction is discussed for the first time. We have calculated rapidity,
transverse momentum distributions as well as such correlation observables as
the distribution in relative azimuthal angle and $(t_1,t_2)$ distributions. The
latter two observables are very different for $\chi_{c0}$ and $\eta_c$ cases.
In contrast to the inclusive production of these mesons considered very
recently in the literature, in the exclusive case the cross section for
$\eta_c$ is much lower than that for $\chi_{c0}$ which is due to a special
interplay of the corresponding vertices and off-diagonal UGDFs used to
calculate the cross sections. We present the numerical results for the key
observables in the framework of potential models for the light-front quarkonia
wave functions. We also discuss how different are the absorptive corrections
for both considered cases.
|
[
{
"created": "Wed, 12 Aug 2020 17:54:55 GMT",
"version": "v1"
},
{
"created": "Sun, 8 Nov 2020 18:05:00 GMT",
"version": "v2"
}
] |
2021-01-04
|
[
[
"Babiarz",
"Izabela",
""
],
[
"Pasechnik",
"Roman",
""
],
[
"Schäfer",
"Wolfgang",
""
],
[
"Szczurek",
"Antoni",
""
]
] |
We study exclusive production of scalar $\chi_{c0}\equiv \chi_c(0^{++})$ and pseudoscalar $\eta_c$ charmonia states in proton-proton collisions at the LHC energies. The amplitudes for $gg \to \chi_{c0}$ as well as for $gg \to \eta_c$ mechanisms are derived in the $k_{T}$-factorization approach. The $p p \to p p \eta_c$ reaction is discussed for the first time. We have calculated rapidity, transverse momentum distributions as well as such correlation observables as the distribution in relative azimuthal angle and $(t_1,t_2)$ distributions. The latter two observables are very different for $\chi_{c0}$ and $\eta_c$ cases. In contrast to the inclusive production of these mesons considered very recently in the literature, in the exclusive case the cross section for $\eta_c$ is much lower than that for $\chi_{c0}$ which is due to a special interplay of the corresponding vertices and off-diagonal UGDFs used to calculate the cross sections. We present the numerical results for the key observables in the framework of potential models for the light-front quarkonia wave functions. We also discuss how different are the absorptive corrections for both considered cases.
|
hep-ph/9904308
|
A. F. W. van Hameren
|
A. van Hameren, R. Kleiss and C.G. Papadopoulos
|
Quantum field theory for discrepancies II: 1/N corrections using
fermions
|
16 pages
|
Nucl.Phys. B558 (1999) 604-620
|
10.1016/S0550-3213(99)00409-5
| null |
hep-ph hep-th
| null |
We calculate the 1/N corrections to the probability distributions of
quadratic discrepancies for sets of N random points. This is achieved by the
introduction of fermionic variables. We give the diagrammatic expansion up to
and including the second order in 1/N. For some discrepancies, we give the
explicit expansion to first order.
|
[
{
"created": "Mon, 12 Apr 1999 18:27:59 GMT",
"version": "v1"
}
] |
2016-09-06
|
[
[
"van Hameren",
"A.",
""
],
[
"Kleiss",
"R.",
""
],
[
"Papadopoulos",
"C. G.",
""
]
] |
We calculate the 1/N corrections to the probability distributions of quadratic discrepancies for sets of N random points. This is achieved by the introduction of fermionic variables. We give the diagrammatic expansion up to and including the second order in 1/N. For some discrepancies, we give the explicit expansion to first order.
|
hep-ph/9211298
| null |
Steven Weinberg
|
Conference Summary
|
40 pages
|
AIP Conf.Proc.272:346-366,1993
|
10.1063/1.43503
|
UTTG-25-92
|
hep-ph
| null |
Talk presented at the XXVI International Conference on High Energy Physics,
Dallas, Texas, August, 12, 1992.
|
[
{
"created": "Tue, 24 Nov 1992 01:51:09 GMT",
"version": "v1"
}
] |
2010-11-01
|
[
[
"Weinberg",
"Steven",
""
]
] |
Talk presented at the XXVI International Conference on High Energy Physics, Dallas, Texas, August, 12, 1992.
|
1004.2347
|
Alexander Merle
|
Alexander Merle
|
The GSI oscillation mystery
|
3 pages, 1 figure; part of the proceedings of the "International
School of Nuclear Physics, 31st Course, 'Neutrinos in Cosmology, in Astro-,
Particle- and Nuclear Physics' " in Erice, Italy, 16 - 24 September 2009
|
Prog.Part.Nucl.Phys.64:445-447,2010
|
10.1016/j.ppnp.2009.12.071
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this talk, a short discussion of the GSI anomaly is given. We discuss the
physics involved using a comparison with pion decay, and explain why the
observed oscillations cannot be caused by standard neutrino mixing.
|
[
{
"created": "Wed, 14 Apr 2010 08:12:06 GMT",
"version": "v1"
}
] |
2014-11-20
|
[
[
"Merle",
"Alexander",
""
]
] |
In this talk, a short discussion of the GSI anomaly is given. We discuss the physics involved using a comparison with pion decay, and explain why the observed oscillations cannot be caused by standard neutrino mixing.
|
1401.5948
|
Ying Li
|
Ying Li
|
Branching Fractions and Direct CP Asymmetries of $\bar B_s ^0 \to K^0
h^+h^{\prime -}(h^{(\prime)}=K,\pi)$ Decays
|
16 pages. arXiv admin note: substantial text overlap with
arXiv:1308.5139, arXiv:0704.1049 by other authors
| null |
10.1007/s11433-014-5581-3
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Motivated by the recent LHCb collaboration measurements of charmless
three-body decays of $\bar B_s^0$ meson, we calculate the branching fractions
of $\bar B_s ^0 \to K^0 \pi^+\pi^-$, $\bar B_s ^0 \to K^0 K^+K^-$, $\bar B_s ^0
\to K^0 \pi^+K^-$ and $\bar B_s ^0 \to \bar K^0 K^+\pi^-$ decay modes using the
factorization approach. Both the resonant and nonresonant contributions are
studied in detail. For the decays $\bar B_s ^0 \to K^0 \pi^+\pi^-$ and $\bar
B_s ^0 \to K^0 K^+K^-$, our results agree well with experimental data, and the
former is dominated by the $K^*$, while the latter one is dominated by the
nonresonant contribution. Considering the flavor SU(3) symmetry violation, the
sum of branching fractions of $\bar B_s ^0 \to K^0 \pi^+K^-$ and $\bar B_s ^0
\to \bar K^0 K^+\pi^-$ could accommodate the data well too. It should be noted
that both branching fractions are sensitive to the scalar density $< K\pi| \bar
s q|0>$. Furthermore, the resonant contributions are dominated by the scalar
$K_0^*(1430)$. We hope that these branching fractions could be measured
individually in the experiments so as to test the factorization approach and
the flavor SU(3) asymmetry. Moreover, the direct CP asymmetries of these decays
are also investigated, which could be measured in the running LHCb experiment
and Super-b factory in the future.
|
[
{
"created": "Thu, 23 Jan 2014 12:03:09 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Sep 2014 12:39:37 GMT",
"version": "v2"
}
] |
2014-09-23
|
[
[
"Li",
"Ying",
""
]
] |
Motivated by the recent LHCb collaboration measurements of charmless three-body decays of $\bar B_s^0$ meson, we calculate the branching fractions of $\bar B_s ^0 \to K^0 \pi^+\pi^-$, $\bar B_s ^0 \to K^0 K^+K^-$, $\bar B_s ^0 \to K^0 \pi^+K^-$ and $\bar B_s ^0 \to \bar K^0 K^+\pi^-$ decay modes using the factorization approach. Both the resonant and nonresonant contributions are studied in detail. For the decays $\bar B_s ^0 \to K^0 \pi^+\pi^-$ and $\bar B_s ^0 \to K^0 K^+K^-$, our results agree well with experimental data, and the former is dominated by the $K^*$, while the latter one is dominated by the nonresonant contribution. Considering the flavor SU(3) symmetry violation, the sum of branching fractions of $\bar B_s ^0 \to K^0 \pi^+K^-$ and $\bar B_s ^0 \to \bar K^0 K^+\pi^-$ could accommodate the data well too. It should be noted that both branching fractions are sensitive to the scalar density $< K\pi| \bar s q|0>$. Furthermore, the resonant contributions are dominated by the scalar $K_0^*(1430)$. We hope that these branching fractions could be measured individually in the experiments so as to test the factorization approach and the flavor SU(3) asymmetry. Moreover, the direct CP asymmetries of these decays are also investigated, which could be measured in the running LHCb experiment and Super-b factory in the future.
|
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