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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
hep-ph/9905246
|
Carlo Giunti
|
S.M. Bilenky and C. Giunti
|
Sterile neutrinos?
|
8 pages. Talk presented by S.M. Bilenky at the VIII International
Workshop on "Neutrino Telescopes", February 23-26, 1999, Venice
| null | null |
UWThPh-1999-32, DFTT 25/99
|
hep-ph
| null |
The notion of sterile neutrinos is discussed. The schemes of mixing of four
massive neutrinos, which imply the existence of sterile neutrinos, are briefly
considered. Several model independent methods that allow to reveal possible
transitions of solar neutrinos into sterile states are presented.
|
[
{
"created": "Wed, 5 May 1999 09:28:59 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Bilenky",
"S. M.",
""
],
[
"Giunti",
"C.",
""
]
] |
The notion of sterile neutrinos is discussed. The schemes of mixing of four massive neutrinos, which imply the existence of sterile neutrinos, are briefly considered. Several model independent methods that allow to reveal possible transitions of solar neutrinos into sterile states are presented.
|
2201.00376
|
Yongchao Zhang
|
Yongchao Zhang
|
Charged Lepton Flavor Violation at the High-Energy Colliders: Neutrino
Mass Relevant Particles
|
22 pages, 14 figures, more figures and references, version published
in special issue of Universe on cLFV
|
Universe 2022, 8, 164
|
10.3390/universe8030164
| null |
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
We summarize the potential charged lepton flavor violation (LFV) from
neutrino mass relevant models, for instance the seesaw mechanisms. In
particular, we study, in a model-dependent way, the LFV signals at the
high-energy hadron and lepton colliders originating from the beyond standard
model (BSM) neutral scalar $H$, doubly charged scalar $H^{\pm\pm}$, heavy
neutrino $N$, heavy $W_R$ boson, and the $Z'$ boson. For the neutral scalar,
doubly charged scalar and $Z'$ boson, the LFV signals originate from the
(effective) LFV couplings of these particles to the charged leptons, while for
the heavy neutrino $N$ and $W_R$ boson, the LFV effects are from flavor mixing
in the neutrino sector. We consider current limits on these BSM particles and
estimate their prospects at future high-energy hadron and lepton colliders.
|
[
{
"created": "Sun, 2 Jan 2022 16:44:12 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Mar 2022 13:54:15 GMT",
"version": "v2"
}
] |
2022-03-17
|
[
[
"Zhang",
"Yongchao",
""
]
] |
We summarize the potential charged lepton flavor violation (LFV) from neutrino mass relevant models, for instance the seesaw mechanisms. In particular, we study, in a model-dependent way, the LFV signals at the high-energy hadron and lepton colliders originating from the beyond standard model (BSM) neutral scalar $H$, doubly charged scalar $H^{\pm\pm}$, heavy neutrino $N$, heavy $W_R$ boson, and the $Z'$ boson. For the neutral scalar, doubly charged scalar and $Z'$ boson, the LFV signals originate from the (effective) LFV couplings of these particles to the charged leptons, while for the heavy neutrino $N$ and $W_R$ boson, the LFV effects are from flavor mixing in the neutrino sector. We consider current limits on these BSM particles and estimate their prospects at future high-energy hadron and lepton colliders.
|
hep-ph/9405246
| null |
M.A. Shifman
|
Theory of Pre-Asymptotic Effects in Weak Inclusive Decays
|
Talk at the Workshop ``Continuous Advances in QCD", 32 pages, 14
figures, plain LaTeX, TPI-MINN-94/17-T, figures available from the author
upon request
| null | null | null |
hep-ph hep-th
| null |
I give an introduction to the theory of preasymptotic effects based on the
systematic OPE/HQET expansion in $1/m_Q$ where $m_Q$ is the heavy quark mass.
The general idea is explained in two most instructive examples, with an
emphasis on pedagogical aspects. Some important results of the last year are
reviewed. In discussing the issue of the quark-hadron duality, one of the basic
ingredients of the theory, I prove that the operator product expansion {\em per
se} is an asymptotic expansion. The behavior of the high order terms in this
expansion determines the onset of duality and the accuracy of the duality
relations. The factorial divergence of the high-order terms in OPE implies a
sophisticated analytical structure in the $\alpha_s$ plane, with terms of the
type $\exp [-\exp (1/\alpha_s )]$.
|
[
{
"created": "Fri, 6 May 1994 21:43:13 GMT",
"version": "v1"
}
] |
2009-09-25
|
[
[
"Shifman",
"M. A.",
""
]
] |
I give an introduction to the theory of preasymptotic effects based on the systematic OPE/HQET expansion in $1/m_Q$ where $m_Q$ is the heavy quark mass. The general idea is explained in two most instructive examples, with an emphasis on pedagogical aspects. Some important results of the last year are reviewed. In discussing the issue of the quark-hadron duality, one of the basic ingredients of the theory, I prove that the operator product expansion {\em per se} is an asymptotic expansion. The behavior of the high order terms in this expansion determines the onset of duality and the accuracy of the duality relations. The factorial divergence of the high-order terms in OPE implies a sophisticated analytical structure in the $\alpha_s$ plane, with terms of the type $\exp [-\exp (1/\alpha_s )]$.
|
hep-ph/0303113
|
Andrey Grozin
|
K. G. Chetyrkin, A. G. Grozin
|
Three-loop anomalous dimension of the heavy-light quark current in HQET
|
16 pages, 7 eps figures. Typos in the discussion of fB/fD corrected.
Paper is also available at http://www-ttp.physik.uni-karlsruhe.de/Preprints/
Results and REDUCE programs are available at
http://www-ttp.physik.uni-karlsruhe.de/Progdata/ttp03/ttp03-10/
|
Nucl.Phys. B666 (2003) 289-302
|
10.1016/S0550-3213(03)00490-5
|
TTP03-10, SFB/CPP-03-05, THEP 03/05
|
hep-ph
| null |
The anomalous dimension of the heavy-light quark current in HQET is
calculated with three-loop accuracy, as well as the renormalized heavy-quark
propagator. The NNL perturbative correction to f_B/f_D is obtained.
|
[
{
"created": "Thu, 13 Mar 2003 19:28:46 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Mar 2003 15:40:31 GMT",
"version": "v2"
},
{
"created": "Wed, 26 Mar 2003 19:19:49 GMT",
"version": "v3"
}
] |
2010-04-05
|
[
[
"Chetyrkin",
"K. G.",
""
],
[
"Grozin",
"A. G.",
""
]
] |
The anomalous dimension of the heavy-light quark current in HQET is calculated with three-loop accuracy, as well as the renormalized heavy-quark propagator. The NNL perturbative correction to f_B/f_D is obtained.
|
1505.04144
|
C. Pallis
|
N. Karagiannakis, G. Lazarides, C. Pallis
|
CMSSM With Generalized Yukawa Quasi-Unification: An Update
|
Final version with updated references. arXiv admin note: substantial
text overlap with arXiv:1503.06186
|
PoS CORFU2014 (2015) 115
| null | null |
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We analyze the parametric space of the constrained minimal supersymmetric
standard model (CMSSM) with mu>0 supplemented by a generalized asymptotic
Yukawa coupling quasi-unification condition which yields acceptable masses for
the fermions of the third family. We impose constraints from the cold dark
matter abundance in the universe and its direct detection experiments, the
B-physics, as well as the masses of the sparticles and the lightest neutral
CP-even Higgs boson, m_h. We identify two distinct allowed regions with
M_{1/2}>m_0 and m_0>>M_{1/2} classified in the hyperbolic branch of the
radiative electroweak symmetry breaking. In the first region we obtain,
approximately, 44<=tan beta<=52, -3<=A_0/M_{1/2}<=0.1, 122<=m_h/GeV<=127, and
mass of the lightest sparticle in the range (0.75-1.43) TeV. Such heavy
lightest sparticle masses can become consistent with the cold dark matter
requirement on the lightest sparticle relic density thanks to neutralino-stau
coannihilations. In the latter region, fixing m_h to its central value from the
LHC, we find a wider allowed parameter space with milder
electroweak-symmetry-breaking fine-tuning, 40<=tanbeta<=50,
-11<=A_0/M_{1/2}<=15 and mass of the lightest sparticle in the range (0.09-1.1)
TeV. This sparticle is possibly detectable by the present cold dark matter
direct search experiments.
|
[
{
"created": "Fri, 15 May 2015 18:07:04 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Sep 2015 16:32:05 GMT",
"version": "v2"
}
] |
2015-09-02
|
[
[
"Karagiannakis",
"N.",
""
],
[
"Lazarides",
"G.",
""
],
[
"Pallis",
"C.",
""
]
] |
We analyze the parametric space of the constrained minimal supersymmetric standard model (CMSSM) with mu>0 supplemented by a generalized asymptotic Yukawa coupling quasi-unification condition which yields acceptable masses for the fermions of the third family. We impose constraints from the cold dark matter abundance in the universe and its direct detection experiments, the B-physics, as well as the masses of the sparticles and the lightest neutral CP-even Higgs boson, m_h. We identify two distinct allowed regions with M_{1/2}>m_0 and m_0>>M_{1/2} classified in the hyperbolic branch of the radiative electroweak symmetry breaking. In the first region we obtain, approximately, 44<=tan beta<=52, -3<=A_0/M_{1/2}<=0.1, 122<=m_h/GeV<=127, and mass of the lightest sparticle in the range (0.75-1.43) TeV. Such heavy lightest sparticle masses can become consistent with the cold dark matter requirement on the lightest sparticle relic density thanks to neutralino-stau coannihilations. In the latter region, fixing m_h to its central value from the LHC, we find a wider allowed parameter space with milder electroweak-symmetry-breaking fine-tuning, 40<=tanbeta<=50, -11<=A_0/M_{1/2}<=15 and mass of the lightest sparticle in the range (0.09-1.1) TeV. This sparticle is possibly detectable by the present cold dark matter direct search experiments.
|
hep-ph/9909246
|
Gabor Papp
|
G. Papp, B.-J. Schaefer, H.-J. Pirner and J. Wambach
|
On the Convergence of the Expansion of Renormalization Group Flow
Equation
|
12 pages with 10 EPS figures included; revised version
|
Phys.Rev. D61 (2000) 096002
|
10.1103/PhysRevD.61.096002
| null |
hep-ph cond-mat hep-th nucl-th
| null |
We compare and discuss the dependence of a polynomial truncation of the
effective potential used to solve exact renormalization group flow equation for
a model with fermionic interaction (linear sigma model) with a grid solution.
The sensitivity of the results on the underlying cutoff function is discussed.
We explore the validity of the expansion method for second and first-order
phase transitions.
|
[
{
"created": "Fri, 3 Sep 1999 16:58:24 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Sep 1999 18:41:57 GMT",
"version": "v2"
},
{
"created": "Fri, 12 Nov 1999 19:39:21 GMT",
"version": "v3"
}
] |
2009-10-31
|
[
[
"Papp",
"G.",
""
],
[
"Schaefer",
"B. -J.",
""
],
[
"Pirner",
"H. -J.",
""
],
[
"Wambach",
"J.",
""
]
] |
We compare and discuss the dependence of a polynomial truncation of the effective potential used to solve exact renormalization group flow equation for a model with fermionic interaction (linear sigma model) with a grid solution. The sensitivity of the results on the underlying cutoff function is discussed. We explore the validity of the expansion method for second and first-order phase transitions.
|
1911.05670
|
V. M. Mostepanenko
|
V. M. Mostepanenko
|
Some remarks on axion dark matter, dark energy and energy of the quantum
vacuum
|
8 pages, 1 figure; to appear in Int. J. Mod. Phys. A; based on the
talk presented at the "10th Alexander Friedmann International Seminar on
Gravitation and Cosmology and 4th Symposium on the Casimir Effect" (Saint
Petersburg, Russia, June 2019)
|
Int. J. Mod. Phys. A v.35, 2040036-(1-9) (2020)
|
10.1142/S0217751X20400369
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In connection with the problem of dark matter, we discuss recent results on
constraining the parameters of axion-to-nucleon interaction following from the
experiment on measuring the difference of Casimir forces. It is shown that this
experiment not only leads to competitive constraints, but provides stronger
support to other constraints obtained in Casimir physics so far. The
description of dark energy by means of cosmological constant originated from
the quantum vacuum is considered in terms of the renormalization procedures in
quantum field theory. It is argued that only the renormalized value of
cosmological constant directly connected with the observed density of dark
energy is of physical significance, so that some statements in the literature
concerning the vacuum catastrophe may be considered as an exaggeration.
|
[
{
"created": "Wed, 13 Nov 2019 17:50:36 GMT",
"version": "v1"
}
] |
2020-05-26
|
[
[
"Mostepanenko",
"V. M.",
""
]
] |
In connection with the problem of dark matter, we discuss recent results on constraining the parameters of axion-to-nucleon interaction following from the experiment on measuring the difference of Casimir forces. It is shown that this experiment not only leads to competitive constraints, but provides stronger support to other constraints obtained in Casimir physics so far. The description of dark energy by means of cosmological constant originated from the quantum vacuum is considered in terms of the renormalization procedures in quantum field theory. It is argued that only the renormalized value of cosmological constant directly connected with the observed density of dark energy is of physical significance, so that some statements in the literature concerning the vacuum catastrophe may be considered as an exaggeration.
|
1001.3075
|
Vicente Vento
|
S. Noguera and V. Vento (Universidad de Valencia - IFIC)
|
The pion transition form factor and the pion distribution amplitude
|
11 pages, 5 postscript figures, uses epsfig.sty and 1 appendix
|
Eur.Phys.J.A46:197-205,2010
|
10.1140/epja/i2010-11029-6
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Recent BaBaR data on the pion transition form factor, whose Q^2 dependence is
much steeper then predicted by asymptotic Quantum Chromodynamics (QCD), have
caused a renewed interest in its theoretical description. We present here a
formalism based on a model independent low energy description and a high energy
description based on QCD, which match at a scale Q_0. The high energy
description incorporates a flat pion distribution amplitude, phi(x)=1, at the
matching scale Q_0 and QCD evolution from Q_0 to Q>Q_0. The flat pion
distribution is connected, through soft pion theorems and chiral symmetry, to
the pion valance parton distribution at the same low scale Q_0. The procedure
leads to a good description of the data, and incorporating additional twist
three effects, to an excellent description of the data.
|
[
{
"created": "Mon, 18 Jan 2010 14:28:05 GMT",
"version": "v1"
}
] |
2010-12-09
|
[
[
"Noguera",
"S.",
"",
"Universidad de Valencia - IFIC"
],
[
"Vento",
"V.",
"",
"Universidad de Valencia - IFIC"
]
] |
Recent BaBaR data on the pion transition form factor, whose Q^2 dependence is much steeper then predicted by asymptotic Quantum Chromodynamics (QCD), have caused a renewed interest in its theoretical description. We present here a formalism based on a model independent low energy description and a high energy description based on QCD, which match at a scale Q_0. The high energy description incorporates a flat pion distribution amplitude, phi(x)=1, at the matching scale Q_0 and QCD evolution from Q_0 to Q>Q_0. The flat pion distribution is connected, through soft pion theorems and chiral symmetry, to the pion valance parton distribution at the same low scale Q_0. The procedure leads to a good description of the data, and incorporating additional twist three effects, to an excellent description of the data.
|
1004.3469
|
Y.H Ahn
|
Y. H. Ahn, Sin Kyu Kang, C. S. Kim and T. Phong Nguyen
|
A direct link between neutrinoless double beta decay and leptogenesis in
a seesaw model with $S_4$ symmetry
|
9 pages, 6 figures, references added, accepted in Phy.Rev.D
|
Phys.Rev.D82:093005,2010
|
10.1103/PhysRevD.82.093005
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study how leptogenesis can be implemented in a seesaw model with $S_4$
flavor symmetry, which leads to the neutrino tri-bimaximal mixing matrix and
degenerate right-handed (RH) neutrino spectrum. Introducing a tiny soft $S_4$
symmetry breaking term in the RH neutrino mass matrix, we show that the
flavored resonant leptogenesis can be successfully realized, which can lower
the seesaw scale much so as to make it possible to probe in colliders. Even
though such a tiny soft breaking term is essential for leptogenesis, it does
not significantly affect the low energy observables. We also investigate how
the effective light neutrino mass $|<m_{ee}> |$ associated with neutrinoless
double beta decay can be predicted along with the neutrino mass hierarchies by
imposing experimental data of low-energy observables. We find a direct link
between leptogenesis and neutrinoless double beta decay characterized by
$|<m_{ee}>|$ through a high energy CP phase $\phi$, which is correlated with
low energy Majorana CP phases. It is shown that our predictions of $|<m_{ee}>|$
for some fixed parameters of high energy physics can be constrained by the
current observation of baryon asymmetry.
|
[
{
"created": "Tue, 20 Apr 2010 14:45:14 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Oct 2010 11:51:55 GMT",
"version": "v2"
}
] |
2010-12-13
|
[
[
"Ahn",
"Y. H.",
""
],
[
"Kang",
"Sin Kyu",
""
],
[
"Kim",
"C. S.",
""
],
[
"Nguyen",
"T. Phong",
""
]
] |
We study how leptogenesis can be implemented in a seesaw model with $S_4$ flavor symmetry, which leads to the neutrino tri-bimaximal mixing matrix and degenerate right-handed (RH) neutrino spectrum. Introducing a tiny soft $S_4$ symmetry breaking term in the RH neutrino mass matrix, we show that the flavored resonant leptogenesis can be successfully realized, which can lower the seesaw scale much so as to make it possible to probe in colliders. Even though such a tiny soft breaking term is essential for leptogenesis, it does not significantly affect the low energy observables. We also investigate how the effective light neutrino mass $|<m_{ee}> |$ associated with neutrinoless double beta decay can be predicted along with the neutrino mass hierarchies by imposing experimental data of low-energy observables. We find a direct link between leptogenesis and neutrinoless double beta decay characterized by $|<m_{ee}>|$ through a high energy CP phase $\phi$, which is correlated with low energy Majorana CP phases. It is shown that our predictions of $|<m_{ee}>|$ for some fixed parameters of high energy physics can be constrained by the current observation of baryon asymmetry.
|
2406.16352
|
Jinwei Wang
|
Yu-Cheng Qiu, Jin-Wei Wang, Tsutomu T. Yanagida
|
Large CP Violation from the Minimum Seesaw Model
|
6 pages, 6 figures,1 table
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The minimum seesaw model with two right-handed neutrinos is considered, where
the lightest neutrino is naturally massless. Instead of adopting texture zeros
in the lepton Yukawa matrices, which cause both theoretical and experimental
troubles, here we propose two-$\boldsymbol\epsilon$ textures, where
$\boldsymbol\epsilon$ is a small number. Combined with neutrino oscillation
experimental data, we find that a large CP angle is preferred for the normal
neutrino mass order. In contrast, the CP angle almost vanishes for the inverted
order. This can be well-tested in near-future experiments, such as
Hyper-Kamiokande. Besides, the predicted effective Majorana neutrino mass
$m_{ee}$ and the total neutrino mass $\sum m^\nu_i$ are also within reach of
ongoing or future experiments.
|
[
{
"created": "Mon, 24 Jun 2024 06:50:19 GMT",
"version": "v1"
}
] |
2024-06-25
|
[
[
"Qiu",
"Yu-Cheng",
""
],
[
"Wang",
"Jin-Wei",
""
],
[
"Yanagida",
"Tsutomu T.",
""
]
] |
The minimum seesaw model with two right-handed neutrinos is considered, where the lightest neutrino is naturally massless. Instead of adopting texture zeros in the lepton Yukawa matrices, which cause both theoretical and experimental troubles, here we propose two-$\boldsymbol\epsilon$ textures, where $\boldsymbol\epsilon$ is a small number. Combined with neutrino oscillation experimental data, we find that a large CP angle is preferred for the normal neutrino mass order. In contrast, the CP angle almost vanishes for the inverted order. This can be well-tested in near-future experiments, such as Hyper-Kamiokande. Besides, the predicted effective Majorana neutrino mass $m_{ee}$ and the total neutrino mass $\sum m^\nu_i$ are also within reach of ongoing or future experiments.
|
hep-ph/0512256
|
Stephan Narison
|
Stephan Narison, CNRS-Montpellier (FR)
|
QCD Tests of the Puzzling Scalar Mesons
|
Version to appear in Phys. Rev. D (one previous figure corrupted)
|
Phys.Rev.D73:114024,2006
|
10.1103/PhysRevD.73.114024
| null |
hep-ph hep-ex hep-lat nucl-th
| null |
Motivated by several recent data, we test the QCD spectral sum rules (QSSR)
predictions based on different proposals (\bar qq, \bar q\bar q qq, and
gluonium) for the nature of scalar mesons. In the I=1 and 1/2 channels, the
unusual (wrong) splitting between the a_0(980) and \kappa(900) and the a_0(980)
width can be understood from QSSR within a \bar qq assignement. However, none
of the \bar qq and \bar q\bar q qq results can explain the large \kappa width,
which may suggest that it can result from a strong interference with
non-resonant backgrounds. In the I=0 channel, QSSR and some low-energy theorems
(LET) require the existence of a low mass gluonium \sigma_B(1 GeV) coupled
strongly to Goldstone boson pairs which plays in the U(1)_V channel, a similar
role than the \eta' for the value of the U(1)_A topological charge. The
observed \sigma(600) and f_0(980) mesons result from a maximal mixing between
the gluonium \sigma_B and \bar qq(1 GeV) mesons, a mixing scheme which passes
several experimental tests. OZI violating J/\psi--> \phi\pi^+\pi^-, D_s--> 3\pi
decays and J/\psi--> \gamma S glueball filter processes may indicate that most
of the I=0 mesons above 1 GeV have important gluonium in their wave functions.
We expect that the f_0(1500), f_0(1710) and f_0(1790) have significant gluonium
component in their wave functions, while the f_0(1370) is mostly \bar qq. Tests
of these results can be provided by the measurements of the pure gluonium
\eta'\eta and 4\pi specific U(1)_A decay channels.
|
[
{
"created": "Tue, 20 Dec 2005 15:03:51 GMT",
"version": "v1"
},
{
"created": "Sat, 27 May 2006 07:15:53 GMT",
"version": "v2"
},
{
"created": "Thu, 1 Jun 2006 07:45:50 GMT",
"version": "v3"
}
] |
2008-11-26
|
[
[
"Narison",
"Stephan",
"",
"FR"
],
[
"CNRS-Montpellier",
"",
"",
"FR"
]
] |
Motivated by several recent data, we test the QCD spectral sum rules (QSSR) predictions based on different proposals (\bar qq, \bar q\bar q qq, and gluonium) for the nature of scalar mesons. In the I=1 and 1/2 channels, the unusual (wrong) splitting between the a_0(980) and \kappa(900) and the a_0(980) width can be understood from QSSR within a \bar qq assignement. However, none of the \bar qq and \bar q\bar q qq results can explain the large \kappa width, which may suggest that it can result from a strong interference with non-resonant backgrounds. In the I=0 channel, QSSR and some low-energy theorems (LET) require the existence of a low mass gluonium \sigma_B(1 GeV) coupled strongly to Goldstone boson pairs which plays in the U(1)_V channel, a similar role than the \eta' for the value of the U(1)_A topological charge. The observed \sigma(600) and f_0(980) mesons result from a maximal mixing between the gluonium \sigma_B and \bar qq(1 GeV) mesons, a mixing scheme which passes several experimental tests. OZI violating J/\psi--> \phi\pi^+\pi^-, D_s--> 3\pi decays and J/\psi--> \gamma S glueball filter processes may indicate that most of the I=0 mesons above 1 GeV have important gluonium in their wave functions. We expect that the f_0(1500), f_0(1710) and f_0(1790) have significant gluonium component in their wave functions, while the f_0(1370) is mostly \bar qq. Tests of these results can be provided by the measurements of the pure gluonium \eta'\eta and 4\pi specific U(1)_A decay channels.
|
2209.03814
|
Fernando Navarra
|
L. M. Abreu, F. S. Navarra and H. P. L. Vieira
|
The $D^*/D$ ratio in heavy ion collisions
|
11 pages, 8 figures
| null |
10.1103/PhysRevD.106.074028
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
In this work we study the $D^*$ and $D$ multiplicities and how they change
during the hadron gas phase of heavy ion collisions. With the help of an
effective Lagrangian formalism, we calculate the production and absorption
cross sections of the $D^*$ and $D$ mesons in a hadronic medium. We compute the
time evolution of the abundances and the ratio $D^* /D$. They are approximately
constant in time. Also, assuming a Bjorken type cooling and using an empirical
relation between the freeze-out temperature and the central multiplicity
density, we estimate $D^* /D$ as a function of $ dN /d \eta (\eta =0)$, which
represents the system size. We find that, while the number of $D^*$'s and $D$'s
grows significantly with the system size, their ratio remains approximately
constant. This prediction can be compared with future experimental data. Our
results suggest that the charm meson interactions in the hadron gas do not
change their multiplicities and consequently these mesons are close to chemical
equilibrium.
|
[
{
"created": "Thu, 8 Sep 2022 13:34:25 GMT",
"version": "v1"
}
] |
2022-11-09
|
[
[
"Abreu",
"L. M.",
""
],
[
"Navarra",
"F. S.",
""
],
[
"Vieira",
"H. P. L.",
""
]
] |
In this work we study the $D^*$ and $D$ multiplicities and how they change during the hadron gas phase of heavy ion collisions. With the help of an effective Lagrangian formalism, we calculate the production and absorption cross sections of the $D^*$ and $D$ mesons in a hadronic medium. We compute the time evolution of the abundances and the ratio $D^* /D$. They are approximately constant in time. Also, assuming a Bjorken type cooling and using an empirical relation between the freeze-out temperature and the central multiplicity density, we estimate $D^* /D$ as a function of $ dN /d \eta (\eta =0)$, which represents the system size. We find that, while the number of $D^*$'s and $D$'s grows significantly with the system size, their ratio remains approximately constant. This prediction can be compared with future experimental data. Our results suggest that the charm meson interactions in the hadron gas do not change their multiplicities and consequently these mesons are close to chemical equilibrium.
|
2201.00216
|
Chung-I Tan
|
Chung-I Tan
|
The Pomeron -- A Bootstrap Story
|
To be published in "Geoff Chew: Architect of the Bootstrap", ed. by
Brink, Brower, DeTar, Tan, Phua, (to be published by World Scientific)
| null | null | null |
hep-ph hep-th physics.hist-ph
|
http://creativecommons.org/publicdomain/zero/1.0/
|
In a contribution to the volume {\it A Passion for Physics}, a collection of
essays in honor of Geoffrey Chew's sixtieth birthday, I wrote, together with A.
Capella, Uday Sukhatme, and Tran Thanh Van {\it The Pomeron Story.} This is a
follow-up to that contribution. This sequel also serves as an opportunity to
acknowledge my gratitude to Geoff as a PhD student under his tutelage.
|
[
{
"created": "Sat, 1 Jan 2022 16:29:39 GMT",
"version": "v1"
}
] |
2022-01-04
|
[
[
"Tan",
"Chung-I",
""
]
] |
In a contribution to the volume {\it A Passion for Physics}, a collection of essays in honor of Geoffrey Chew's sixtieth birthday, I wrote, together with A. Capella, Uday Sukhatme, and Tran Thanh Van {\it The Pomeron Story.} This is a follow-up to that contribution. This sequel also serves as an opportunity to acknowledge my gratitude to Geoff as a PhD student under his tutelage.
|
1203.5213
|
Sadataka Furui
|
Sadataka Furui
|
The flavor symmetry in the standard model and the triality symmetry
|
16 pages 8 figures, To be published in International Journal of
Modern Physics A
| null |
10.1142/S0217751X12501588
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A Dirac fermion is expressed by a 4 component spinor which is a combination
of two quaternions and which can be treated as an octonion. The octonion
possesses the triality symmetry, which defines symmetry of fermion spinors and
bosonic vector fields.
The triality symmetry relates three sets of spinors and two sets of vectors,
which are transformed among themselves via transformations $G_{23}, G_{12},
G_{13}$, $G_{123}$ and $G_{132}$. If the electromagnetic (EM) interaction is
sensitive to the triality symmetry, i.e. EM probe selects one triality sector,
EM signals from the 5 transformed world would not be detected, and be treated
as the dark matter. According to an astrophysical measurement, the ratio of the
dark to ordinary matter in the universe as a whole is almost exactly 5. We
expect quarks are insensitive to the triality, and triality will appear as
three times larger flavor degrees of freedom in the lattice simulation.
|
[
{
"created": "Fri, 23 Mar 2012 11:18:29 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Jul 2012 13:29:51 GMT",
"version": "v2"
},
{
"created": "Tue, 23 Oct 2012 04:46:54 GMT",
"version": "v3"
}
] |
2015-06-04
|
[
[
"Furui",
"Sadataka",
""
]
] |
A Dirac fermion is expressed by a 4 component spinor which is a combination of two quaternions and which can be treated as an octonion. The octonion possesses the triality symmetry, which defines symmetry of fermion spinors and bosonic vector fields. The triality symmetry relates three sets of spinors and two sets of vectors, which are transformed among themselves via transformations $G_{23}, G_{12}, G_{13}$, $G_{123}$ and $G_{132}$. If the electromagnetic (EM) interaction is sensitive to the triality symmetry, i.e. EM probe selects one triality sector, EM signals from the 5 transformed world would not be detected, and be treated as the dark matter. According to an astrophysical measurement, the ratio of the dark to ordinary matter in the universe as a whole is almost exactly 5. We expect quarks are insensitive to the triality, and triality will appear as three times larger flavor degrees of freedom in the lattice simulation.
|
1106.1036
|
Elena G. Ferreiro
|
E. G. Ferreiro, F. Fleuret, J.P Lansberg, N. Matagne, A.
Rakotozafindrabe
|
Quarkonium as a tool: cold nuclear matter effects
|
Contribution to the proceedings of QUARKONIUM 2010: Three Days Of
Quarkonium Production in pp and pA Collisions, 29-31 July 2010, Palaiseau,
France. 4 pages, 4 figures
|
Nucl.Phys.Proc.Suppl.214:143-146,2011
|
10.1016/j.nuclphysbps.2011.03.074
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss the quarkonium production as a tool for the study of the Quark
Gluon Plasma. In particular, we concentrate on the Cold Nuclear Matter effetcs.
We show that quarkonium production is also useful for the study of Quantum
Chromodynamics first principles and the nuclear Parton Distribution Functions.
|
[
{
"created": "Mon, 6 Jun 2011 11:57:43 GMT",
"version": "v1"
}
] |
2011-06-21
|
[
[
"Ferreiro",
"E. G.",
""
],
[
"Fleuret",
"F.",
""
],
[
"Lansberg",
"J. P",
""
],
[
"Matagne",
"N.",
""
],
[
"Rakotozafindrabe",
"A.",
""
]
] |
We discuss the quarkonium production as a tool for the study of the Quark Gluon Plasma. In particular, we concentrate on the Cold Nuclear Matter effetcs. We show that quarkonium production is also useful for the study of Quantum Chromodynamics first principles and the nuclear Parton Distribution Functions.
|
hep-ph/0210352
|
Angela Yerks
|
G. L. Kane (Michigan Center for Theoretical Physics, Randall
Laboratory, University of Michigan)
|
Connecting String Theory and Phenomenology
|
Invited Plenary talk, SUSY02, Hamburg, June 2002
| null | null | null |
hep-ph astro-ph hep-ex hep-th
| null |
To make progress in learning the underlying fundamental theory, it will be
necessary to combine bottom-up phenomenology and top-down analysis -- in
particular, top-down is unlikely to succeed alone. Here I elaborate on the role
of both, and describe obstacles that need to be overcome to help data point
toward the underlying theory, as well as approaches that might help to bypass
full systematic treatments. I also summarize arguments that superpartners are
probably being produced at the Tevatron Collider.
|
[
{
"created": "Fri, 25 Oct 2002 14:49:38 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Oct 2002 18:31:47 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Kane",
"G. L.",
"",
"Michigan Center for Theoretical Physics, Randall\n Laboratory, University of Michigan"
]
] |
To make progress in learning the underlying fundamental theory, it will be necessary to combine bottom-up phenomenology and top-down analysis -- in particular, top-down is unlikely to succeed alone. Here I elaborate on the role of both, and describe obstacles that need to be overcome to help data point toward the underlying theory, as well as approaches that might help to bypass full systematic treatments. I also summarize arguments that superpartners are probably being produced at the Tevatron Collider.
|
1512.00869
|
Oliver Fischer Dr.
|
Ivo de Medeiros Varzielas and Oliver Fischer
|
Non-Abelian family symmetries as portals to dark matter
|
16 pages plus references
| null |
10.1007/JHEP01(2016)160
| null |
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Non-Abelian family symmetries offer a very promising explanation for the
flavour structure in the Standard Model and its extensions. We explore the
possibility that dark matter consists in fermions that transform under a family
symmetry, such that the visible and dark sector are linked by the familons -
Standard Model gauge singlet scalars, responsible for spontaneously breaking
the family symmetry. We study three representative models with non-Abelian
family symmetries that have been shown capable to explain the masses and mixing
of the Standard Model fermions. One of our central results is the possibility
to have dark matter fermions and at least one familon with masses on and even
below the experimentally accessible TeV scale. In particular we discuss the
characteristic signatures in collider experiments from light familon Fields
with a non-Abelian family symmetry, and we show that run I of the LHC is
already testing this class of models.
|
[
{
"created": "Wed, 2 Dec 2015 21:11:18 GMT",
"version": "v1"
}
] |
2016-03-23
|
[
[
"Varzielas",
"Ivo de Medeiros",
""
],
[
"Fischer",
"Oliver",
""
]
] |
Non-Abelian family symmetries offer a very promising explanation for the flavour structure in the Standard Model and its extensions. We explore the possibility that dark matter consists in fermions that transform under a family symmetry, such that the visible and dark sector are linked by the familons - Standard Model gauge singlet scalars, responsible for spontaneously breaking the family symmetry. We study three representative models with non-Abelian family symmetries that have been shown capable to explain the masses and mixing of the Standard Model fermions. One of our central results is the possibility to have dark matter fermions and at least one familon with masses on and even below the experimentally accessible TeV scale. In particular we discuss the characteristic signatures in collider experiments from light familon Fields with a non-Abelian family symmetry, and we show that run I of the LHC is already testing this class of models.
|
0707.4545
|
Tatsu Takeuchi
|
Minako Honda, Yee Kao, Naotoshi Okamura, Alexey Pronin, and Tatsu
Takeuchi
|
Constraints on New Physics from Long Baseline Neutrino Oscillation
Experiments
|
47 pages RevTeX4, 8 eps figures, uses axodraw, updated bibliography
| null | null |
OCHA-PP-273, KEK-TH-1149, VPI-IPNAS-07-06
|
hep-ph
| null |
New physics beyond the Standard Model can lead to extra matter effects on
neutrino oscillation if the new interactions distinguish among the three
flavors of neutrino. In a previous paper, we argued that a long-baseline
neutrino oscillation experiment in which the Fermilab-NUMI beam in its
high-energy mode is aimed at the planned Hyper-Kamiokande detector would be
capable of constraining the size of those extra effects, provided the vacuum
value of \sin^2 2\theta_{23} is not too close to one. In this paper, we discuss
how such a constraint would translate into limits on the coupling constants and
masses of new particles in various models. The models we consider are: models
with generation distinguishing Z's such as topcolor assisted technicolor,
models containing various types of leptoquarks, R-parity violating SUSY, and
extended Higgs sector models. In several cases, we find that the limits thus
obtained could be competitive with those expected from direct searches at the
LHC. In the event that any of the particles discussed here are discovered at
the LHC, then the observation, or non-observation, of their matter effects
could help in identifying what type of particle had been observed.
|
[
{
"created": "Tue, 31 Jul 2007 07:02:51 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Aug 2007 03:08:54 GMT",
"version": "v2"
}
] |
2007-08-07
|
[
[
"Honda",
"Minako",
""
],
[
"Kao",
"Yee",
""
],
[
"Okamura",
"Naotoshi",
""
],
[
"Pronin",
"Alexey",
""
],
[
"Takeuchi",
"Tatsu",
""
]
] |
New physics beyond the Standard Model can lead to extra matter effects on neutrino oscillation if the new interactions distinguish among the three flavors of neutrino. In a previous paper, we argued that a long-baseline neutrino oscillation experiment in which the Fermilab-NUMI beam in its high-energy mode is aimed at the planned Hyper-Kamiokande detector would be capable of constraining the size of those extra effects, provided the vacuum value of \sin^2 2\theta_{23} is not too close to one. In this paper, we discuss how such a constraint would translate into limits on the coupling constants and masses of new particles in various models. The models we consider are: models with generation distinguishing Z's such as topcolor assisted technicolor, models containing various types of leptoquarks, R-parity violating SUSY, and extended Higgs sector models. In several cases, we find that the limits thus obtained could be competitive with those expected from direct searches at the LHC. In the event that any of the particles discussed here are discovered at the LHC, then the observation, or non-observation, of their matter effects could help in identifying what type of particle had been observed.
|
0807.2364
|
Toru Kojo
|
Toru Kojo and Daisuke Jido
|
Dynamical study of bare $\sigma$ pole with $1/N_c$ classifications
|
5 pages, 4 figures
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Systematic $1/N_c$ counting of correlators is performed to directly relate
quark-gluon dynamics to qualitatively different hadronic states order by order.
Both 2q and 4q correlators of $\sigma$ quanta are analyzed with $1/N_c$
separation of the instanton, glueball, and in particular, two meson scattering
states. The {\it bare} resonance pole with no mixing effects are studied with
the QCD sum rules (QSR). The bare mass relation for large $N_c$ mesons,
$m_{\rho}<m_{4q}^{I=J=0}<m_{2q}^{I=J=0}$, is derived. The firm theoretical
ground of the QSR at the leading $1/N_{c}$ analyses is also emphasized.
|
[
{
"created": "Tue, 15 Jul 2008 13:59:08 GMT",
"version": "v1"
}
] |
2008-07-16
|
[
[
"Kojo",
"Toru",
""
],
[
"Jido",
"Daisuke",
""
]
] |
Systematic $1/N_c$ counting of correlators is performed to directly relate quark-gluon dynamics to qualitatively different hadronic states order by order. Both 2q and 4q correlators of $\sigma$ quanta are analyzed with $1/N_c$ separation of the instanton, glueball, and in particular, two meson scattering states. The {\it bare} resonance pole with no mixing effects are studied with the QCD sum rules (QSR). The bare mass relation for large $N_c$ mesons, $m_{\rho}<m_{4q}^{I=J=0}<m_{2q}^{I=J=0}$, is derived. The firm theoretical ground of the QSR at the leading $1/N_{c}$ analyses is also emphasized.
|
1911.13298
|
Triparno Bandyopadhyay
|
Triparno Bandyopadhyay, Rinku Maji
|
The E6 route to multicomponent dark matter
|
Minor changes, typos fixed. 32 pages, 4 figures
| null | null |
TIFR/TH/19-39
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a framework of dark- and visible-sector unification in the E6
embedding of the standard model. The demand for consistently getting the
standard model leads to the existence of the dark-sector. We show that the
hierarchy of vevs typifying unified models leads to multicomponent dark matter
at the IR. The symmetry breaking itself categorises the matter content into
dark- and visible-sector particles, the categorisation being uniform across
different breaking chains. We discuss the stability of the dark matter
particles and compare them to existing phenomenological models of dark matter.
The central results follow from symmetry and hierarchy arguments. We present an
indicative set of models of gauge coupling unification, to show that the
framework can be embedded in realistic models of E6.
|
[
{
"created": "Fri, 29 Nov 2019 18:56:42 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Oct 2020 19:35:05 GMT",
"version": "v2"
},
{
"created": "Wed, 25 Nov 2020 09:21:16 GMT",
"version": "v3"
}
] |
2020-11-26
|
[
[
"Bandyopadhyay",
"Triparno",
""
],
[
"Maji",
"Rinku",
""
]
] |
We present a framework of dark- and visible-sector unification in the E6 embedding of the standard model. The demand for consistently getting the standard model leads to the existence of the dark-sector. We show that the hierarchy of vevs typifying unified models leads to multicomponent dark matter at the IR. The symmetry breaking itself categorises the matter content into dark- and visible-sector particles, the categorisation being uniform across different breaking chains. We discuss the stability of the dark matter particles and compare them to existing phenomenological models of dark matter. The central results follow from symmetry and hierarchy arguments. We present an indicative set of models of gauge coupling unification, to show that the framework can be embedded in realistic models of E6.
|
hep-ph/0007164
|
National Center for Physics
|
Riazuddin, T.A. Al-Aithan and Amjad Hussain Shah Gilani
|
Form factors for $B-->\pi l\nu$ decay in a model constrained by chiral
symmetry and quark model
|
7 pages, Revtex, 5 figure, fig 3 is replaced and some text is added
|
Int.J.Mod.Phys. A17 (2002) 4927-4938
|
10.1142/S0217751X02012326
|
NCP-QAU/0007-15
|
hep-ph
| null |
The form factors for the $B-->\pi$ transition are evaluated in the entire
momentum transfer range by using the constraints obtained in the framework
combining the heavy quark expansion and chiral symmetry for light quarks and
the quark model. In particular, we calculate the valence quark contributions
and show that it together with the equal time commutator contribution simulate
a B-meson pole q^2-dependence of form factors in addition to the usual vector
meson B^{*}-pole diagram for $B --> \pi l\nu$ in the above framework. We
discuss the predictions in our model, which provide an estimate of |V_{ub}|^2.
|
[
{
"created": "Sat, 15 Jul 2000 20:56:18 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Sep 2000 17:11:29 GMT",
"version": "v2"
}
] |
2009-10-31
|
[
[
"Riazuddin",
"",
""
],
[
"Al-Aithan",
"T. A.",
""
],
[
"Gilani",
"Amjad Hussain Shah",
""
]
] |
The form factors for the $B-->\pi$ transition are evaluated in the entire momentum transfer range by using the constraints obtained in the framework combining the heavy quark expansion and chiral symmetry for light quarks and the quark model. In particular, we calculate the valence quark contributions and show that it together with the equal time commutator contribution simulate a B-meson pole q^2-dependence of form factors in addition to the usual vector meson B^{*}-pole diagram for $B --> \pi l\nu$ in the above framework. We discuss the predictions in our model, which provide an estimate of |V_{ub}|^2.
|
hep-ph/9907463
|
Jf Yang
|
Jifeng Yang (Fudan Univ., Shanghai, P. R. China)
|
Confinement of Higgs bosons from hidden symmetry and convexity
|
15 pages, LaTex, no figure
| null | null | null |
hep-ph
| null |
In the full effective potential (EFP) approach, we find that spontaneous
symmetry breaking (SSB) can, with the convexity of the full EFP, lead to the
prediction of the IR confinement of Higgs particles, adding difficulty to the
experimental identification of Higgs particles. The short distance behaviors
remain intact. The whole presentation is given in the understanding that any
QFT becomes UV well defined in a more complete underyling theory according to a
recently proposed strategy.
|
[
{
"created": "Fri, 23 Jul 1999 08:38:55 GMT",
"version": "v1"
},
{
"created": "Fri, 15 Oct 1999 12:06:51 GMT",
"version": "v2"
},
{
"created": "Mon, 25 Oct 1999 09:17:57 GMT",
"version": "v3"
}
] |
2007-05-23
|
[
[
"Yang",
"Jifeng",
"",
"Fudan Univ., Shanghai, P. R. China"
]
] |
In the full effective potential (EFP) approach, we find that spontaneous symmetry breaking (SSB) can, with the convexity of the full EFP, lead to the prediction of the IR confinement of Higgs particles, adding difficulty to the experimental identification of Higgs particles. The short distance behaviors remain intact. The whole presentation is given in the understanding that any QFT becomes UV well defined in a more complete underyling theory according to a recently proposed strategy.
|
2204.05631
|
Zolt\'an Nagy
|
Zoltan Nagy and Davison E. Soper
|
Multivariable evolution in parton showers with initial state partons
|
43 pages, 13 figures
| null |
10.1103/PhysRevD.106.014024
|
DESY-22-049
|
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
One can use more than one scale variable to define the family of surfaces in
the space of parton splitting parameters that define the evolution of a parton
shower. In an earlier paper, we developed this idea for electron-positron
annihilation. Here, we use multiple scale variables for a parton shower with
initial state partons. Then we need a more sophisticated analysis because the
evolution of parton distribution functions must be coordinated with the parton
shower evolution. We make the needed connections more precise than in our
earlier work, even for the case of just one scale variable. Then we develop an
example with three scale variables, which leads to advantages compared to the
usual shower formulation with only one scale variable. We provide results for
Drell-Yan muon pair production.
|
[
{
"created": "Tue, 12 Apr 2022 08:47:07 GMT",
"version": "v1"
}
] |
2022-08-17
|
[
[
"Nagy",
"Zoltan",
""
],
[
"Soper",
"Davison E.",
""
]
] |
One can use more than one scale variable to define the family of surfaces in the space of parton splitting parameters that define the evolution of a parton shower. In an earlier paper, we developed this idea for electron-positron annihilation. Here, we use multiple scale variables for a parton shower with initial state partons. Then we need a more sophisticated analysis because the evolution of parton distribution functions must be coordinated with the parton shower evolution. We make the needed connections more precise than in our earlier work, even for the case of just one scale variable. Then we develop an example with three scale variables, which leads to advantages compared to the usual shower formulation with only one scale variable. We provide results for Drell-Yan muon pair production.
|
0801.0895
|
Yeo Woong Yoon
|
Chuan-Hung Chen, C. S. Kim, Yeo Woong Yoon
|
Investigation of $B_{u,d}\to (\pi, K) \pi$ decays within unparticle
physics
|
Analysis on mixing part is revised
|
Phys.Lett.B671:250-255,2009
|
10.1016/j.physletb.2008.12.007
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the implication of unparticle physics on the B_{u,d}\to (\pi,
K) \pi decays under the constraints of the B_{d,s}-\bar B_{d,s} mixing. We
found that not only the unparticle parameters that belong to the flavor
changing neutral current (FCNC) processes but also scaling dimension d_{\UP}
could be constrained by the B_{d,s}-\bar B_{d,s} mixing phenomenology.
Employing the minimum \chi^2 analysis to the B_{u,d}\to (\pi, K) \pi decays
with the constraints of B_{d,s} mixing, we find that the puzzle of large
branching ratio for B_{d}\to \pi^0 \pi^0 and the discrepancy between the
standard model estimation and data for the direct CP asymmetry of B^+ \to K^+
\pi^0 and B_d \to \pi^+\pi^- can be resolved well. However, the mixing induced
CP asymmetry of B_d\to K_S \pi^0 could not be well accommodated by the
unparticle contributions.
|
[
{
"created": "Mon, 7 Jan 2008 01:07:18 GMT",
"version": "v1"
},
{
"created": "Fri, 18 Jan 2008 08:44:29 GMT",
"version": "v2"
},
{
"created": "Mon, 15 Dec 2008 00:25:14 GMT",
"version": "v3"
}
] |
2009-01-14
|
[
[
"Chen",
"Chuan-Hung",
""
],
[
"Kim",
"C. S.",
""
],
[
"Yoon",
"Yeo Woong",
""
]
] |
We investigate the implication of unparticle physics on the B_{u,d}\to (\pi, K) \pi decays under the constraints of the B_{d,s}-\bar B_{d,s} mixing. We found that not only the unparticle parameters that belong to the flavor changing neutral current (FCNC) processes but also scaling dimension d_{\UP} could be constrained by the B_{d,s}-\bar B_{d,s} mixing phenomenology. Employing the minimum \chi^2 analysis to the B_{u,d}\to (\pi, K) \pi decays with the constraints of B_{d,s} mixing, we find that the puzzle of large branching ratio for B_{d}\to \pi^0 \pi^0 and the discrepancy between the standard model estimation and data for the direct CP asymmetry of B^+ \to K^+ \pi^0 and B_d \to \pi^+\pi^- can be resolved well. However, the mixing induced CP asymmetry of B_d\to K_S \pi^0 could not be well accommodated by the unparticle contributions.
|
1810.01197
|
Wolfgang Lucha
|
Thomas Hilger, Mar\'ia G\'omez-Rocha, Andreas Krassnigg, Wolfgang
Lucha
|
Open-Flavour Mesons from the Angle of Bethe, Dyson, Salpeter, Schwinger,
et al
|
8 pages, 6 figures, contributed to "XIII Quark Confinement and the
Hadron Spectrum - Confinement2018" (31 July - 6 August 2018, Maynooth
University, Ireland)
|
PoS Confinement2018 (2019) 252
| null |
HEPHY-PUB 1008/18 (2018)
|
hep-ph hep-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Recently, we completed a comprehensive investigation of a huge part of the
entire meson spectrum by considering both quarkonia and open-flavour mesons by
means of a single common framework which unites the homogeneous Bethe-Salpeter
equation that describes mesons as quark-antiquark bound states and the
Dyson-Schwinger equation that governs the full quark propagator: Adopting two
(as a matter of fact, not extremely diverse) models that attempt to grasp all
principal aspects of the effective strong interactions entering identically in
both these equations, we derived within this unique setup, for all mesons
analysed, their masses and leptonic decay constants as well as, for the
pseudoscalar ones among these mesons, their in-hadron condensates. Here, as a
kind of promotion or teaser, we give but a few examples of the resulting
collections of data, laying the main emphasis on the dependence of our insights
on the effective-interaction model underlying all such outcomes.
|
[
{
"created": "Tue, 2 Oct 2018 12:15:45 GMT",
"version": "v1"
}
] |
2019-06-20
|
[
[
"Hilger",
"Thomas",
""
],
[
"Gómez-Rocha",
"María",
""
],
[
"Krassnigg",
"Andreas",
""
],
[
"Lucha",
"Wolfgang",
""
]
] |
Recently, we completed a comprehensive investigation of a huge part of the entire meson spectrum by considering both quarkonia and open-flavour mesons by means of a single common framework which unites the homogeneous Bethe-Salpeter equation that describes mesons as quark-antiquark bound states and the Dyson-Schwinger equation that governs the full quark propagator: Adopting two (as a matter of fact, not extremely diverse) models that attempt to grasp all principal aspects of the effective strong interactions entering identically in both these equations, we derived within this unique setup, for all mesons analysed, their masses and leptonic decay constants as well as, for the pseudoscalar ones among these mesons, their in-hadron condensates. Here, as a kind of promotion or teaser, we give but a few examples of the resulting collections of data, laying the main emphasis on the dependence of our insights on the effective-interaction model underlying all such outcomes.
|
0911.3072
|
Klaus Rabbertz
|
Klaus Rabbertz
|
QCD Physics Potential of CMS
|
Institut fuer Experimentelle Kernphysik, University of Karlsruhe,
Germany. On behalf of the CMS Collaboration, in proceedings of "1st IPM
Meeting on LHC Physics, Isfahan, Iran, 20.-24. April 2009". 10 pages, 16
figures
| null | null |
CMS CR 2009/189
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In view of the approaching LHC operation the feasibility and accuracy of QCD
measurements with the CMS experiment at the Large Hadron Collider (LHC)
involving hadrons and jets are discussed. This summary is based on analyses
performed at CMS for center-of-mass energies of 10 as well as 14 TeV assuming
event numbers ranging from some days of data taking up to 100/pb of integrated
luminosity with proton-proton collisions.
|
[
{
"created": "Mon, 16 Nov 2009 16:41:37 GMT",
"version": "v1"
}
] |
2009-11-17
|
[
[
"Rabbertz",
"Klaus",
""
]
] |
In view of the approaching LHC operation the feasibility and accuracy of QCD measurements with the CMS experiment at the Large Hadron Collider (LHC) involving hadrons and jets are discussed. This summary is based on analyses performed at CMS for center-of-mass energies of 10 as well as 14 TeV assuming event numbers ranging from some days of data taking up to 100/pb of integrated luminosity with proton-proton collisions.
|
2112.14579
|
J\"urgen Eser
|
J\"urgen Eser and Jean-Paul Blaizot
|
S-wave pion-pion scattering lengths from nucleon-meson fluctuations
| null | null | null | null |
hep-ph nucl-th
|
http://creativecommons.org/licenses/by/4.0/
|
We present calculations of the $S$-wave isospin-zero and isospin-two
pion-pion scattering lengths within a nucleon-meson model with parity doubling.
Both scattering lengths are computed in various approximations, ranging from a
mean-field (MF) calculation towards the inclusion of loop corrections by means
of the functional renormalization group (FRG). The bosonic part of the
investigated nucleon-meson model is formulated in terms of stereographic
projections as a "natural" set of coordinates on the respective vacuum
manifold. We thereby elucidate subtleties concerning the truncation of the
effective action w.r.t. higher-derivative pion interactions and the
"successful" computation of the scattering lengths. As the main result, we find
simultaneous agreement for the isospin-zero and isospin-two scattering lengths
with experimental data within the $\mathrm{LPA}^{\prime}$-truncation of the
FRG, together with chiral symmetry breaking (roughly) occurring at the
characteristic scale of $4\pi f_{\pi}$. The isoscalar $\sigma$-mass is
dynamically generated by the FRG integration of momentum modes, and is a
prediction of the model. It ends being of the order of $500\ \mathrm{MeV}$,
i.e., much lower than the value ($> 1\ \mathrm{GeV}$) found in MF or one-loop
treatment of this or related models. Finally, the convergence of the
corresponding low-energy expansion of the quantum effective action in terms of
pion momenta is discussed.
|
[
{
"created": "Wed, 29 Dec 2021 14:37:29 GMT",
"version": "v1"
}
] |
2021-12-30
|
[
[
"Eser",
"Jürgen",
""
],
[
"Blaizot",
"Jean-Paul",
""
]
] |
We present calculations of the $S$-wave isospin-zero and isospin-two pion-pion scattering lengths within a nucleon-meson model with parity doubling. Both scattering lengths are computed in various approximations, ranging from a mean-field (MF) calculation towards the inclusion of loop corrections by means of the functional renormalization group (FRG). The bosonic part of the investigated nucleon-meson model is formulated in terms of stereographic projections as a "natural" set of coordinates on the respective vacuum manifold. We thereby elucidate subtleties concerning the truncation of the effective action w.r.t. higher-derivative pion interactions and the "successful" computation of the scattering lengths. As the main result, we find simultaneous agreement for the isospin-zero and isospin-two scattering lengths with experimental data within the $\mathrm{LPA}^{\prime}$-truncation of the FRG, together with chiral symmetry breaking (roughly) occurring at the characteristic scale of $4\pi f_{\pi}$. The isoscalar $\sigma$-mass is dynamically generated by the FRG integration of momentum modes, and is a prediction of the model. It ends being of the order of $500\ \mathrm{MeV}$, i.e., much lower than the value ($> 1\ \mathrm{GeV}$) found in MF or one-loop treatment of this or related models. Finally, the convergence of the corresponding low-energy expansion of the quantum effective action in terms of pion momenta is discussed.
|
2407.14961
|
Kazem Azizi
|
S. S. Agaev, K. Azizi, H. Sundu
|
Heavy four-quark mesons $bc\overline{b}\overline{c}$: Scalar particle
|
11 Pages, 4 Figures and 1 Table
| null | null | null |
hep-ph hep-ex hep-lat
|
http://creativecommons.org/licenses/by/4.0/
|
Parameters of the heavy four-quark scalar meson $T_{\mathrm{2bc}}=bc
\overline{b}\overline{c}$ are calculated by means of the sum rule method. This
structure is considered as a diquark-antidiquark state built of scalar diquark
and antidiquark components. The mass and current coupling of $T_{
\mathrm{2bc}}$ are evaluated in the context of the two-point sum rule approach.
The full width of this tetraquark is estimated by taking into account two types
of its possible strong decay channels. First class includes dissociation of
$T_{\mathrm{2bc}}$ to mesons $\eta_c\eta_{b}$, $ B_{c}^{+}B_{c}^{-}$,
$B_{c}^{\ast +}B_{c}^{\ast -}$ and $ B_{c}^{+}(1^3P_{0})B_{c}^{\ast-}$. Another
type of processes are generated by annihilations $\overline{b}b \to
\overline{q}q$ of constituent $b$-quarks which produces the final-state charmed
meson pairs $D^{+}D^{-}$, $D^{0} \overline{D}^{0}$, $D^{*+}D^{*-}$, and
$D^{*0}\overline{D}^{*0}$. Partial width all of these decays are found using
the three-point sum rule method which is required to calculate strong couplings
at corresponding meson-meson-tetraquark vertices. Predictions obtained for the
mass $m=(12697 \pm 90)~\mathrm{MeV}$ and width $\Gamma[T_{\mathrm{2bc}}]=(142.4
\pm 16.9)~ \mathrm{MeV}$ of the state $T_{\mathrm{2bc}}$ are compared with
alternative results, and are useful for further experimental investigations of
fully heavy resonances.
|
[
{
"created": "Sat, 20 Jul 2024 18:46:22 GMT",
"version": "v1"
}
] |
2024-07-23
|
[
[
"Agaev",
"S. S.",
""
],
[
"Azizi",
"K.",
""
],
[
"Sundu",
"H.",
""
]
] |
Parameters of the heavy four-quark scalar meson $T_{\mathrm{2bc}}=bc \overline{b}\overline{c}$ are calculated by means of the sum rule method. This structure is considered as a diquark-antidiquark state built of scalar diquark and antidiquark components. The mass and current coupling of $T_{ \mathrm{2bc}}$ are evaluated in the context of the two-point sum rule approach. The full width of this tetraquark is estimated by taking into account two types of its possible strong decay channels. First class includes dissociation of $T_{\mathrm{2bc}}$ to mesons $\eta_c\eta_{b}$, $ B_{c}^{+}B_{c}^{-}$, $B_{c}^{\ast +}B_{c}^{\ast -}$ and $ B_{c}^{+}(1^3P_{0})B_{c}^{\ast-}$. Another type of processes are generated by annihilations $\overline{b}b \to \overline{q}q$ of constituent $b$-quarks which produces the final-state charmed meson pairs $D^{+}D^{-}$, $D^{0} \overline{D}^{0}$, $D^{*+}D^{*-}$, and $D^{*0}\overline{D}^{*0}$. Partial width all of these decays are found using the three-point sum rule method which is required to calculate strong couplings at corresponding meson-meson-tetraquark vertices. Predictions obtained for the mass $m=(12697 \pm 90)~\mathrm{MeV}$ and width $\Gamma[T_{\mathrm{2bc}}]=(142.4 \pm 16.9)~ \mathrm{MeV}$ of the state $T_{\mathrm{2bc}}$ are compared with alternative results, and are useful for further experimental investigations of fully heavy resonances.
|
hep-ph/0703192
|
Ara Ioannisian Dr.
|
N. A. Kazarian and M. A. Nalbandyan
|
Neutrino oscillations in medium with periodic square potential
|
LaTeX, 6 pages with 1 figure
| null | null | null |
hep-ph
| null |
We have investigated two flavor neutrino oscillations in medium with periodic
step electron number density profile. An approximate analytical solution have
been found when the length of the density fluctuation is smaller then the
neutrino oscillation length.
|
[
{
"created": "Sun, 18 Mar 2007 23:18:38 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Mar 2007 20:46:49 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Kazarian",
"N. A.",
""
],
[
"Nalbandyan",
"M. A.",
""
]
] |
We have investigated two flavor neutrino oscillations in medium with periodic step electron number density profile. An approximate analytical solution have been found when the length of the density fluctuation is smaller then the neutrino oscillation length.
|
1303.3463
|
Kei Yagyu
|
Yuji Kajiyama, Hiroshi Okada, Kei Yagyu
|
Two Loop Radiative Seesaw Model with Inert Triplet Scalar Field
|
Reference [41] is added
| null |
10.1016/j.nuclphysb.2013.05.020
|
KIAS-P13013
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We propose a radiative seesaw model with an inert triplet scalar field in
which Majorana neutrino masses are generated at the two loop level. There are
fermionic or bosonic dark matter candidates in the model. We find that each
candidate can satisfy the WMAP data when its mass is taken to be around the
half of the mass of the standard model like Higgs boson. We also discuss
phenomenology of the inert triplet scalar bosons, especially focusing on the
doubly-charged scalar bosons at Large Hadron Collider in parameter regions
constrained by the electroweak precision data and WMAP data. We study how we
can distinguish our model from the minimal Higgs triplet model.
|
[
{
"created": "Thu, 14 Mar 2013 14:40:48 GMT",
"version": "v1"
},
{
"created": "Sun, 17 Mar 2013 14:20:42 GMT",
"version": "v2"
},
{
"created": "Wed, 29 May 2013 15:18:41 GMT",
"version": "v3"
},
{
"created": "Thu, 30 May 2013 17:49:18 GMT",
"version": "v4"
}
] |
2015-06-15
|
[
[
"Kajiyama",
"Yuji",
""
],
[
"Okada",
"Hiroshi",
""
],
[
"Yagyu",
"Kei",
""
]
] |
We propose a radiative seesaw model with an inert triplet scalar field in which Majorana neutrino masses are generated at the two loop level. There are fermionic or bosonic dark matter candidates in the model. We find that each candidate can satisfy the WMAP data when its mass is taken to be around the half of the mass of the standard model like Higgs boson. We also discuss phenomenology of the inert triplet scalar bosons, especially focusing on the doubly-charged scalar bosons at Large Hadron Collider in parameter regions constrained by the electroweak precision data and WMAP data. We study how we can distinguish our model from the minimal Higgs triplet model.
|
hep-ph/0112306
|
Fredrick Olness
|
S. Kretzer, D. Mason, F. Olness
|
Differential Distributions for NLO Neutrino-Production of Charm
|
3 pages, 1 figures. Contribution to Snowmass 2001 workshop, P5 group
|
eConf C010630 (2001) P507
| null | null |
hep-ph
| null |
Charged current DIS charm production measures the strange-quark PDF. A
complete analysis requires both a fully differential theoretical calculation,
and a Monte Carlo detector simulation. We present analytic and numeric results
at NLO suitable for experimental analysis.
|
[
{
"created": "Fri, 21 Dec 2001 20:42:57 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Kretzer",
"S.",
""
],
[
"Mason",
"D.",
""
],
[
"Olness",
"F.",
""
]
] |
Charged current DIS charm production measures the strange-quark PDF. A complete analysis requires both a fully differential theoretical calculation, and a Monte Carlo detector simulation. We present analytic and numeric results at NLO suitable for experimental analysis.
|
hep-ph/9510361
| null |
M.Pitk\"anen (Helsinki,Finland)
|
About the construction of p-adic QFT limit of TGD
|
82 pages, Tex lplain, no figures
| null | null | null |
hep-ph
| null |
The p-adic description of Higgs mechanism provides excellent predictions for
elementary particle and hadron masses. In this work the construction of p-adic
field theory limit of Quantum TGD is considered. Topological condensate defined
as a manifold obtained by gluing together p-adic spacetime regions with
different values of $p$ is identified as 'quantum average' space time defined
as absolute minimum of effective action $S_e$ associated with K\"ahler Dirac
action defining configuration space geometry. p-Adic spacetime topology is
ultrametric in accordance with the analogy with spin glass phase implied by the
vacuum degenerary of K\"ahler action. Symmetry arguments suggest that $S_e$ in
presence of fermion fields is just the super symmetrized K\"ahler Dirac action.
Super symmetrization motivated by $N=1$ super symmetry generated by right
handed neutrino replaces H-coordinates with their super counterparts and
requires color singletness of physical states appears as consistency condition.
p-Adic $Diff(M^4)$ and canonical transformations of $CP_2$ localized with
respect to $M^4$ are approximate symmetries of the effective action and broken
only by the nonflatness of the induced metric. Super gauge invariances in
interior allow only massless many boson states with vanishing electroweak and
color quantum numbers including graviton in accordance with the hypothesis that
elementary particle quantum numbers reside on boundaries. Boundary components
are idealized with world lines and Kac Moody Dirac spinors used in mass
calculations describe the conformal degrees of freedom of the boundary
component. Perturbation theory in powers of $p$ converges extremely rapidly: UV
divergences are absent but natural infrared cutoff is present.
|
[
{
"created": "Fri, 20 Oct 1995 10:02:28 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Pitkänen",
"M.",
"",
"Helsinki,Finland"
]
] |
The p-adic description of Higgs mechanism provides excellent predictions for elementary particle and hadron masses. In this work the construction of p-adic field theory limit of Quantum TGD is considered. Topological condensate defined as a manifold obtained by gluing together p-adic spacetime regions with different values of $p$ is identified as 'quantum average' space time defined as absolute minimum of effective action $S_e$ associated with K\"ahler Dirac action defining configuration space geometry. p-Adic spacetime topology is ultrametric in accordance with the analogy with spin glass phase implied by the vacuum degenerary of K\"ahler action. Symmetry arguments suggest that $S_e$ in presence of fermion fields is just the super symmetrized K\"ahler Dirac action. Super symmetrization motivated by $N=1$ super symmetry generated by right handed neutrino replaces H-coordinates with their super counterparts and requires color singletness of physical states appears as consistency condition. p-Adic $Diff(M^4)$ and canonical transformations of $CP_2$ localized with respect to $M^4$ are approximate symmetries of the effective action and broken only by the nonflatness of the induced metric. Super gauge invariances in interior allow only massless many boson states with vanishing electroweak and color quantum numbers including graviton in accordance with the hypothesis that elementary particle quantum numbers reside on boundaries. Boundary components are idealized with world lines and Kac Moody Dirac spinors used in mass calculations describe the conformal degrees of freedom of the boundary component. Perturbation theory in powers of $p$ converges extremely rapidly: UV divergences are absent but natural infrared cutoff is present.
|
hep-ph/0305086
|
Thomas G. Rizzo
|
H. Davoudiasl, J.L. Hewett, and T.G. Rizzo
|
Brane Localized Curvature for Warped Gravitons
|
20 pages, 11 figures, LaTex, minor revisions
|
JHEP 0308 (2003) 034
|
10.1088/1126-6708/2003/08/034
|
SLAC-PUB-9734
|
hep-ph hep-ex hep-th
| null |
We study the effects of including brane localized curvature terms in the
Randall-Sundrum (RS) model of the hierarchy. This leads to the existence of
brane localized kinetic terms for the graviton. Such terms can be induced by
brane and bulk quantum effects as well as Higgs-curvature mixing on the brane.
We derive the modified spectrum of Kaluza-Klein (KK) gravitons and their
couplings to 4-dimensional fields in the presence of these terms. We find that
the masses and couplings of the KK gravitons have considerable dependence on
the size of the brane localized terms; the weak-scale phenomenology of the
model is consequently modified . In particular, the weak-scale spin-2 graviton
resonances which generically appear in the RS model may be significantly
lighter than previously assumed. However, they may avoid detection as their
widths may be too narrow to be observable at colliders. In the contact
interaction limit, for a certain range of parameters, the experimental reach
for the scale of the theory is independent of the size of the boundary terms.
|
[
{
"created": "Thu, 8 May 2003 16:12:52 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Aug 2003 17:25:13 GMT",
"version": "v2"
},
{
"created": "Fri, 12 Sep 2003 16:20:20 GMT",
"version": "v3"
}
] |
2009-11-10
|
[
[
"Davoudiasl",
"H.",
""
],
[
"Hewett",
"J. L.",
""
],
[
"Rizzo",
"T. G.",
""
]
] |
We study the effects of including brane localized curvature terms in the Randall-Sundrum (RS) model of the hierarchy. This leads to the existence of brane localized kinetic terms for the graviton. Such terms can be induced by brane and bulk quantum effects as well as Higgs-curvature mixing on the brane. We derive the modified spectrum of Kaluza-Klein (KK) gravitons and their couplings to 4-dimensional fields in the presence of these terms. We find that the masses and couplings of the KK gravitons have considerable dependence on the size of the brane localized terms; the weak-scale phenomenology of the model is consequently modified . In particular, the weak-scale spin-2 graviton resonances which generically appear in the RS model may be significantly lighter than previously assumed. However, they may avoid detection as their widths may be too narrow to be observable at colliders. In the contact interaction limit, for a certain range of parameters, the experimental reach for the scale of the theory is independent of the size of the boundary terms.
|
1007.1920
|
Lianyi He
|
Lianyi He
|
Nambu-Jona-Lasinio model description of weakly interacting Bose
condensate and BEC-BCS crossover in dense QCD-like theories
|
29 pages + 9 figures. Published version in PRD
|
Phys.Rev.D82:096003,2010
|
10.1103/PhysRevD.82.096003
| null |
hep-ph cond-mat.supr-con nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
QCD-like theories possess a positively definite fermion determinant at finite
baryon chemical potential $\mu_{\text B}$ and the lattice simulation can be
successfully performed. While the chiral perturbation theories are sufficient
to describe the Bose condensate at low density, to describe the crossover from
Bose-Einstein condensation (BEC) to BCS superfluidity at moderate density we
should use some fermionic effective model of QCD, such as the
Nambu-Jona-Lasinio model. In this paper, using two-color two-flavor QCD as an
example, we examine how the Nambu-Jona-Lasinio model describes the weakly
interacting Bose condensate at low density and the BEC-BCS crossover at
moderate density. Near the quantum phase transition point $\mu_{\text B}=m_\pi$
($m_\pi$ is the mass of pion/diquark multiplet), the Ginzburg-Landau free
energy at the mean-field level can be reduced to the Gross-Pitaevskii free
energy describing a weakly repulsive Bose condensate with a diquark-diquark
scattering length identical to that predicted by the chiral perturbation
theories. The Goldstone mode recovers the Bogoliubov excitation in weakly
interacting Bose condensates. The results of in-medium chiral and diquark
condensates predicted by chiral perturbation theories are analytically
recovered. The BEC-BCS crossover and meson Mott transition at moderate baryon
chemical potential as well as the beyond-mean-field corrections are studied.
Part of our results can also be applied to real QCD at finite baryon or isospin
chemical potential.
|
[
{
"created": "Mon, 12 Jul 2010 14:49:11 GMT",
"version": "v1"
},
{
"created": "Sat, 24 Jul 2010 22:44:09 GMT",
"version": "v2"
},
{
"created": "Fri, 24 Sep 2010 18:56:30 GMT",
"version": "v3"
},
{
"created": "Mon, 4 Oct 2010 17:01:27 GMT",
"version": "v4"
},
{
"created": "Wed, 10 Nov 2010 15:37:01 GMT",
"version": "v5"
}
] |
2010-11-19
|
[
[
"He",
"Lianyi",
""
]
] |
QCD-like theories possess a positively definite fermion determinant at finite baryon chemical potential $\mu_{\text B}$ and the lattice simulation can be successfully performed. While the chiral perturbation theories are sufficient to describe the Bose condensate at low density, to describe the crossover from Bose-Einstein condensation (BEC) to BCS superfluidity at moderate density we should use some fermionic effective model of QCD, such as the Nambu-Jona-Lasinio model. In this paper, using two-color two-flavor QCD as an example, we examine how the Nambu-Jona-Lasinio model describes the weakly interacting Bose condensate at low density and the BEC-BCS crossover at moderate density. Near the quantum phase transition point $\mu_{\text B}=m_\pi$ ($m_\pi$ is the mass of pion/diquark multiplet), the Ginzburg-Landau free energy at the mean-field level can be reduced to the Gross-Pitaevskii free energy describing a weakly repulsive Bose condensate with a diquark-diquark scattering length identical to that predicted by the chiral perturbation theories. The Goldstone mode recovers the Bogoliubov excitation in weakly interacting Bose condensates. The results of in-medium chiral and diquark condensates predicted by chiral perturbation theories are analytically recovered. The BEC-BCS crossover and meson Mott transition at moderate baryon chemical potential as well as the beyond-mean-field corrections are studied. Part of our results can also be applied to real QCD at finite baryon or isospin chemical potential.
|
2006.06029
|
Konstantinos Dimopoulos
|
Konstantinos Dimopoulos
|
An analytic treatment of Quartic Hilltop Inflation
|
8 pages, 3 figures, added reference
| null |
10.1016/j.physletb.2020.135688
| null |
hep-ph astro-ph.CO gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Quartic hilltop inflation remains one of the most successful inflationary
models. Yet, the expectations of early treatments of hilltop inflation would
contradict the observations and render the model excluded. However, recent
numerical treatment has demonstrated that quartic hilltop inflation actually
fares well with observations. In this work, a fully analytic treatment of the
model aims to dispel the mystery surrounding the behaviour of quartic hilltop
inflation. The results obtained are in excellent agreement with numerical works
on the subject, yet offer simple analytic formulas to calculate observables and
easily test thereby quartic hilltop inflation, hopefully revealing information
on the theoretical background.
|
[
{
"created": "Wed, 10 Jun 2020 18:50:59 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Jun 2020 11:46:19 GMT",
"version": "v2"
}
] |
2020-08-12
|
[
[
"Dimopoulos",
"Konstantinos",
""
]
] |
Quartic hilltop inflation remains one of the most successful inflationary models. Yet, the expectations of early treatments of hilltop inflation would contradict the observations and render the model excluded. However, recent numerical treatment has demonstrated that quartic hilltop inflation actually fares well with observations. In this work, a fully analytic treatment of the model aims to dispel the mystery surrounding the behaviour of quartic hilltop inflation. The results obtained are in excellent agreement with numerical works on the subject, yet offer simple analytic formulas to calculate observables and easily test thereby quartic hilltop inflation, hopefully revealing information on the theoretical background.
|
0808.3982
|
Peter Schweitzer
|
H.Avakian, A.V.Efremov, P.Schweitzer, F.Yuan
|
Pretzelosity distribution function
|
contribution to Transversity 2008, 28-31 May 2008, Ferrara, Italy
| null |
10.1142/9789814277785_0026
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The 'pretzelosity' distribution is discussed. Theoretical properties, model
results, and perspectives to access experimental information on this leading
twist, transverse momentum dependent parton distribution function are reviewed.
Its relation to helicity and transversity distributions is highlighted.
|
[
{
"created": "Thu, 28 Aug 2008 20:11:15 GMT",
"version": "v1"
}
] |
2017-08-23
|
[
[
"Avakian",
"H.",
""
],
[
"Efremov",
"A. V.",
""
],
[
"Schweitzer",
"P.",
""
],
[
"Yuan",
"F.",
""
]
] |
The 'pretzelosity' distribution is discussed. Theoretical properties, model results, and perspectives to access experimental information on this leading twist, transverse momentum dependent parton distribution function are reviewed. Its relation to helicity and transversity distributions is highlighted.
|
hep-ph/0512201
|
Markus Diehl
|
M. Diehl
|
Generalized parton distributions: recent results
|
9 pages, 5 figures. To appear in the proceedings of the Particles and
Nuclei International Conference (PANIC 05), Santa Fe, NM, USA, 24-28 Oct 2005
| null |
10.1063/1.2220251
|
DESY-05-256
|
hep-ph
| null |
I review progress on selected issues connected with generalized parton
distributions. Topics range from the description of hard exclusive reactions to
the spatial distribution of quarks in the nucleon and the contribution of their
orbital angular momentum to the nucleon spin.
|
[
{
"created": "Thu, 15 Dec 2005 12:20:45 GMT",
"version": "v1"
}
] |
2009-11-11
|
[
[
"Diehl",
"M.",
""
]
] |
I review progress on selected issues connected with generalized parton distributions. Topics range from the description of hard exclusive reactions to the spatial distribution of quarks in the nucleon and the contribution of their orbital angular momentum to the nucleon spin.
|
hep-ph/0409234
|
Werner Vogelsang
|
George Sterman (Stony Brook), Werner Vogelsang (BNL)
|
Recoil and Power Corrections in High-x_T Direct-Photon Production
|
22 pages, 4 figures as epsi, one reference added
|
Phys.Rev.D71:014013,2005
|
10.1103/PhysRevD.71.014013
|
BNL-NT-04/28, RBRC-432, YITP-SB-04-44
|
hep-ph
| null |
We study a class of nonperturbative corrections to single-inclusive photon
cross sections at measured transverse momentum p_T, in the large-x_T limit. We
develop an extension of the joint (threshold and transverse momentum)
resummation formalism, appropriate for large x_T, in which there are no
kinematic singularities associated with recoil, and for which matching to fixed
order and to threshold resummation at next-to-leading logarithm (NLL) is
straightforward. Beyond NLL, we find contributions that can be attributed to
recoil from initial state radiation. Associated power corrections occur as
inverse powers of p_T^2 and are identified from the infrared structure of
integrals over the running coupling. They have significant energy dependence
and decrease from typical fixed-target to collider energies. Energy
conservation, which is incorporated into joint resummation, moderates the
effects of perturbative recoil and power corrections for large x_T.
|
[
{
"created": "Mon, 20 Sep 2004 18:54:49 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Sep 2004 15:08:56 GMT",
"version": "v2"
}
] |
2014-11-18
|
[
[
"Sterman",
"George",
"",
"Stony Brook"
],
[
"Vogelsang",
"Werner",
"",
"BNL"
]
] |
We study a class of nonperturbative corrections to single-inclusive photon cross sections at measured transverse momentum p_T, in the large-x_T limit. We develop an extension of the joint (threshold and transverse momentum) resummation formalism, appropriate for large x_T, in which there are no kinematic singularities associated with recoil, and for which matching to fixed order and to threshold resummation at next-to-leading logarithm (NLL) is straightforward. Beyond NLL, we find contributions that can be attributed to recoil from initial state radiation. Associated power corrections occur as inverse powers of p_T^2 and are identified from the infrared structure of integrals over the running coupling. They have significant energy dependence and decrease from typical fixed-target to collider energies. Energy conservation, which is incorporated into joint resummation, moderates the effects of perturbative recoil and power corrections for large x_T.
|
hep-ph/0612053
|
Arif Shoshi
|
Misha Kozlov, Arif I. Shoshi and Bo-Wen Xiao
|
Total gluon shadowing due to fluctuation effects
|
12 pages, 1 figure; two plots and further explanations added; matches
version accepted for publication
|
Nucl.Phys.A792:170-186,2007
|
10.1016/j.nuclphysa.2007.04.023
|
BI-TP 2006/42, CU-TP 1168
|
hep-ph
| null |
We show a new physical phenomenon expected for the ratio R_{pA} of the
unintegrated gluon distribution of a nucleus over the unintegrated gluon
distribution of a proton scaled up by the atomic factor A^{1/3} in the
fluctuation-dominated (diffusive scaling) region at high energy. We calculate
the dependence of R_{pA} on the atomic number A, the rapidity Y and the
transverse gluon momentum k_{\perp}. We find that R_{pA} exhibits an increasing
gluon shadowing with growing rapidity, approaching 1/A^{1/3} at asymptotic
rapidities which means total gluon shadowing, due to the effect of gluon number
fluctuations or Pomeron loops. The increase of R_{pA} with rising gluon
momentum decreases as the rapidity grows. In contrast, in the geometric scaling
region where the effect of fluctuations is negligible, the ratio R_{pA} shows
only partial gluon shadowing in the fixed-coupling case, basically independent
on the rapidity and the gluon momentum.
|
[
{
"created": "Tue, 5 Dec 2006 17:40:36 GMT",
"version": "v1"
},
{
"created": "Wed, 2 May 2007 16:04:50 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Kozlov",
"Misha",
""
],
[
"Shoshi",
"Arif I.",
""
],
[
"Xiao",
"Bo-Wen",
""
]
] |
We show a new physical phenomenon expected for the ratio R_{pA} of the unintegrated gluon distribution of a nucleus over the unintegrated gluon distribution of a proton scaled up by the atomic factor A^{1/3} in the fluctuation-dominated (diffusive scaling) region at high energy. We calculate the dependence of R_{pA} on the atomic number A, the rapidity Y and the transverse gluon momentum k_{\perp}. We find that R_{pA} exhibits an increasing gluon shadowing with growing rapidity, approaching 1/A^{1/3} at asymptotic rapidities which means total gluon shadowing, due to the effect of gluon number fluctuations or Pomeron loops. The increase of R_{pA} with rising gluon momentum decreases as the rapidity grows. In contrast, in the geometric scaling region where the effect of fluctuations is negligible, the ratio R_{pA} shows only partial gluon shadowing in the fixed-coupling case, basically independent on the rapidity and the gluon momentum.
|
1607.07092
|
Joshua C. Long
|
J. Long
|
Search for Lorentz Violation using Short-Range Tests of Gravity
|
Presented at the Seventh Meeting on CPT and Lorentz Symmetry,
Bloomington, Indiana, June 20-24, 2016
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Experimental tests of the newtonian inverse square law at short range, one at
Indiana University and the other at the Huazhong University of Science and
Technology, have been used to set limits on Lorentz violation in the pure
gravity sector of the nonminimal Standard-Model Extension. In the
nonrelativistic limit, the constraints derived for the 14 independent SME
coefficients for Lorentz violation acting simultaneously are of order $10^{-9}$
m$^{2}$.
|
[
{
"created": "Sun, 24 Jul 2016 21:18:45 GMT",
"version": "v1"
}
] |
2016-07-26
|
[
[
"Long",
"J.",
""
]
] |
Experimental tests of the newtonian inverse square law at short range, one at Indiana University and the other at the Huazhong University of Science and Technology, have been used to set limits on Lorentz violation in the pure gravity sector of the nonminimal Standard-Model Extension. In the nonrelativistic limit, the constraints derived for the 14 independent SME coefficients for Lorentz violation acting simultaneously are of order $10^{-9}$ m$^{2}$.
|
hep-ph/0605075
|
J. P. Ma
|
J.P. Ma and Q. Wang
|
On Transverse-Momentum Dependent Light-Cone Wave Functions of Light
Mesons
|
add more discussions and references
|
Phys.Lett.B642:232-237,2006
|
10.1016/j.physletb.2006.09.029
| null |
hep-ph
| null |
Transverse-momentum dependent (TMD) light-cone wave functions of a light
meson are important ingredients in the TMD QCD factorization of exclusive
processes. This factorization allows one conveniently resum Sudakov logarithms
appearing in collinear factorization. The TMD light-cone wave functions are not
simply related to the standard light-cone wave functions in collinear
factorization by integrating them over the transverse momentum. We explore
relations between TMD light-cone wave functions and those in the collinear
factorization. Two factorized relations can be found. One is helpful for
constructing models for TMD light-cone wave functions, and the other can be
used for resummation. These relations will be useful to establish a link
between two types of factorization.
|
[
{
"created": "Mon, 8 May 2006 04:50:41 GMT",
"version": "v1"
},
{
"created": "Mon, 15 May 2006 01:24:43 GMT",
"version": "v2"
},
{
"created": "Mon, 14 Aug 2006 05:58:00 GMT",
"version": "v3"
},
{
"created": "Mon, 4 Sep 2006 01:37:13 GMT",
"version": "v4"
}
] |
2008-11-26
|
[
[
"Ma",
"J. P.",
""
],
[
"Wang",
"Q.",
""
]
] |
Transverse-momentum dependent (TMD) light-cone wave functions of a light meson are important ingredients in the TMD QCD factorization of exclusive processes. This factorization allows one conveniently resum Sudakov logarithms appearing in collinear factorization. The TMD light-cone wave functions are not simply related to the standard light-cone wave functions in collinear factorization by integrating them over the transverse momentum. We explore relations between TMD light-cone wave functions and those in the collinear factorization. Two factorized relations can be found. One is helpful for constructing models for TMD light-cone wave functions, and the other can be used for resummation. These relations will be useful to establish a link between two types of factorization.
|
1703.00017
|
David M\"uller
|
Andreas Ipp, David M\"uller
|
Broken boost invariance in the Glasma via finite nuclei thickness
|
6 pages, 4 figures
|
Phys.Lett.B 771 (2017) 74-79
|
10.1016/j.physletb.2017.05.032
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We simulate the creation and evolution of non-boost-invariant Glasma in the
early stages of heavy ion collisions within the color glass condensate
framework. This is accomplished by extending the McLerran-Venugopalan model to
include a parameter for the Lorentz-contracted but finite width of the nucleus
in the beam direction. We determine the rapidity profile of the Glasma energy
density, which shows deviations from the boost-invariant result. Varying the
parameters both broad and narrow profiles can be produced. We compare our
results to experimental data from RHIC and find surprising agreement.
|
[
{
"created": "Tue, 28 Feb 2017 19:00:02 GMT",
"version": "v1"
}
] |
2020-10-08
|
[
[
"Ipp",
"Andreas",
""
],
[
"Müller",
"David",
""
]
] |
We simulate the creation and evolution of non-boost-invariant Glasma in the early stages of heavy ion collisions within the color glass condensate framework. This is accomplished by extending the McLerran-Venugopalan model to include a parameter for the Lorentz-contracted but finite width of the nucleus in the beam direction. We determine the rapidity profile of the Glasma energy density, which shows deviations from the boost-invariant result. Varying the parameters both broad and narrow profiles can be produced. We compare our results to experimental data from RHIC and find surprising agreement.
|
hep-ph/9208253
| null |
Thomas D. Cohen and Wojciech Broniowski
|
The role of the Delta isobar in chiral perturbation theory and hedgehog
soliton models
|
12 pages, report DOE/ER/40322-154, U. of MD PP \#92-191
|
Phys.Lett. B292 (1992) 5-9
|
10.1016/0370-2693(92)90599-Y
| null |
hep-ph
| null |
Hedgehog model predictions for the leading nonanalytic behavior (in
$m^{2}_{\pi }$) of certain observables are shown to agree with the predictions
of chiral perturbation theory up to an overall factor which depends on the
operator. This factor can be understood in terms of contributions of the
$\Delta$ isobar in chiral loops. These physically motivated contributions are
analyzed in an expansion in which both $m_{\pi}$ and $M_{\Delta}-M_N$ are taken
as small parameters, and are shown to yield large corrections to both hedgehog
models and chiral perturbation theory.
|
[
{
"created": "Wed, 26 Aug 1992 17:38:15 GMT",
"version": "v1"
}
] |
2009-10-22
|
[
[
"Cohen",
"Thomas D.",
""
],
[
"Broniowski",
"Wojciech",
""
]
] |
Hedgehog model predictions for the leading nonanalytic behavior (in $m^{2}_{\pi }$) of certain observables are shown to agree with the predictions of chiral perturbation theory up to an overall factor which depends on the operator. This factor can be understood in terms of contributions of the $\Delta$ isobar in chiral loops. These physically motivated contributions are analyzed in an expansion in which both $m_{\pi}$ and $M_{\Delta}-M_N$ are taken as small parameters, and are shown to yield large corrections to both hedgehog models and chiral perturbation theory.
|
2110.05496
|
Florian Herren
|
Joshua Davies, Florian Herren and Anders Eller Thomsen
|
General Gauge-Yukawa-Quartic $\beta$-Functions at 4-3-2--Loop Order
|
27 pages, 519 tensor structures and coefficients
| null |
10.1007/JHEP01(2022)051
|
FERMILAB-PUB-21-471-T
|
hep-ph hep-th
|
http://creativecommons.org/licenses/by/4.0/
|
We determine the full set of coefficients for the completely general 4-loop
gauge and 3-loop Yukawa $ \beta $-functions for the most general renormalizable
four-dimensional theories. Using a complete parametrization of the $ \beta
$-functions, we compare the general form to the specific $ \beta $-functions of
known theories to constrain the unknown coefficients. The Weyl consistency
conditions provide additional constraints, completing the determination.
|
[
{
"created": "Mon, 11 Oct 2021 18:00:01 GMT",
"version": "v1"
}
] |
2022-01-26
|
[
[
"Davies",
"Joshua",
""
],
[
"Herren",
"Florian",
""
],
[
"Thomsen",
"Anders Eller",
""
]
] |
We determine the full set of coefficients for the completely general 4-loop gauge and 3-loop Yukawa $ \beta $-functions for the most general renormalizable four-dimensional theories. Using a complete parametrization of the $ \beta $-functions, we compare the general form to the specific $ \beta $-functions of known theories to constrain the unknown coefficients. The Weyl consistency conditions provide additional constraints, completing the determination.
|
2303.04537
|
Hai-Jun Li
|
Hai-Jun Li
|
QCD axion bubbles from the hidden SU(N) gauge symmetry breaking
|
8 pages, 2 figures. Comments are welcome
| null | null |
BNU-23-028
|
hep-ph astro-ph.CO
|
http://creativecommons.org/licenses/by/4.0/
|
The QCD axion bubbles can be formed due to an extra Peccei-Quinn (PQ)
symmetry breaking in the early Universe. In this paper, we investigate the QCD
axion bubbles formation from the PQ symmetry broken by hidden $SU(N)_H$ gauge
interactions after inflation, which leads to the multiple vacua. The axion
acquires a light mass and then settles down into different vacua. The QCD axion
bubbles are formed when the conventional QCD axion arises during the QCD phase
transition. In our scenario, the QCD axions that start to oscillate at the
large values $\sim2\pi/3$ can lead to the high density axion bubbles with
$N=2$. The cosmological implications of the QCD axion bubbles are also
discussed, such as the primordial black holes (PBHs) and the axion
miniclusters. We find that the PBH mass is lager than
$\sim\mathcal{O}(5\times10^5)M_\odot$ for the axion scale
$f_a\sim\mathcal{O}(10^{16})\, \rm GeV$.
|
[
{
"created": "Wed, 8 Mar 2023 12:18:58 GMT",
"version": "v1"
}
] |
2023-03-09
|
[
[
"Li",
"Hai-Jun",
""
]
] |
The QCD axion bubbles can be formed due to an extra Peccei-Quinn (PQ) symmetry breaking in the early Universe. In this paper, we investigate the QCD axion bubbles formation from the PQ symmetry broken by hidden $SU(N)_H$ gauge interactions after inflation, which leads to the multiple vacua. The axion acquires a light mass and then settles down into different vacua. The QCD axion bubbles are formed when the conventional QCD axion arises during the QCD phase transition. In our scenario, the QCD axions that start to oscillate at the large values $\sim2\pi/3$ can lead to the high density axion bubbles with $N=2$. The cosmological implications of the QCD axion bubbles are also discussed, such as the primordial black holes (PBHs) and the axion miniclusters. We find that the PBH mass is lager than $\sim\mathcal{O}(5\times10^5)M_\odot$ for the axion scale $f_a\sim\mathcal{O}(10^{16})\, \rm GeV$.
|
hep-ph/9601310
|
Masashi Hayakawa
|
M. Hayakawa, T. Kinoshita and A. I. Sanda
|
Hadronic Light-by-light Scattering Contribution to Muon $ g - 2 $
|
42 pages, Revtex 4 figures
|
Phys.Rev. D54 (1996) 3137-3153
|
10.1103/PhysRevD.54.3137
|
DPNU-95-30
|
hep-ph
| null |
The hadronic light-by-light scattering contribution to muon $g-2$ is examined
based on the low energy effective theories of QCD, the Nambu-Jona-Lasinio model
and hidden local symmetry approach, supplemented by a general information
concerning the asymptotic behavior of QCD.
Our result is $- 52 \times 10^{-11}$ with an uncertainty of $\pm 18 \times
10^{-11}$, which includes our best estimate of model dependence. This is within
the expected measurement uncertainty of $40\times 10^{-11}$ in the forthcoming
experiment at Brookhaven National Laboratory. Our result removes one of the
main theoretical obstacles in verifying the existence of the weak contribution
to the muon $g-2$.
|
[
{
"created": "Tue, 23 Jan 1996 02:38:53 GMT",
"version": "v1"
}
] |
2016-09-01
|
[
[
"Hayakawa",
"M.",
""
],
[
"Kinoshita",
"T.",
""
],
[
"Sanda",
"A. I.",
""
]
] |
The hadronic light-by-light scattering contribution to muon $g-2$ is examined based on the low energy effective theories of QCD, the Nambu-Jona-Lasinio model and hidden local symmetry approach, supplemented by a general information concerning the asymptotic behavior of QCD. Our result is $- 52 \times 10^{-11}$ with an uncertainty of $\pm 18 \times 10^{-11}$, which includes our best estimate of model dependence. This is within the expected measurement uncertainty of $40\times 10^{-11}$ in the forthcoming experiment at Brookhaven National Laboratory. Our result removes one of the main theoretical obstacles in verifying the existence of the weak contribution to the muon $g-2$.
|
hep-ph/0501201
|
Koichi Matsuda
|
Koichi Matsuda and Hiroyuki Nishiura
|
Prediction for Quark Mixing from Universal Quark and Lepton Mass
Matrices with Flavor 2 <-> 3 Symmetry
|
25 pages, 5 figures
|
Phys.Rev. D71 (2005) 073001
|
10.1103/PhysRevD.71.073001
| null |
hep-ph
| null |
We propose a mass matrix model that gives a unified description of quark and
lepton with the same texture form based on a flavor 2 <-> 3 symmetry. The model
is in contrast with the conventional picture that the mass matrix forms in the
quark sector will take somewhat different structures from those in the lepton
sector. By investigating possible types of assignment for masses, we find that
our quark mass matrices can lead to small CKM quark mixings which are
consistent with experimental values. We also find some
phase-parameter-independent relations among CKM quark mixing matrix elements.
|
[
{
"created": "Fri, 21 Jan 2005 04:47:23 GMT",
"version": "v1"
}
] |
2009-11-11
|
[
[
"Matsuda",
"Koichi",
""
],
[
"Nishiura",
"Hiroyuki",
""
]
] |
We propose a mass matrix model that gives a unified description of quark and lepton with the same texture form based on a flavor 2 <-> 3 symmetry. The model is in contrast with the conventional picture that the mass matrix forms in the quark sector will take somewhat different structures from those in the lepton sector. By investigating possible types of assignment for masses, we find that our quark mass matrices can lead to small CKM quark mixings which are consistent with experimental values. We also find some phase-parameter-independent relations among CKM quark mixing matrix elements.
|
hep-ph/0202215
|
Nora Brambilla
|
Nora Brambilla (U. Milano)
|
Heavy Quarkonium and QCD Non Relativistic Effective field Theories
|
9 pages, revtex4 style, Invited talk given at the "Workshop on
Charmonium Spectroscopy: Past and Future", Genova, June 2001, to appear in
the proceedings of the workshop
| null | null |
IFUM-701-FT
|
hep-ph
| null |
QCD nonrelativistic effective field theories (NREFT) are the modern and most
suitable frame to describe heavy quarkonium properties. In this talk I
summarize few relevant concepts and some interesting physical applications of
NREFT.
|
[
{
"created": "Fri, 22 Feb 2002 17:10:55 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Brambilla",
"Nora",
"",
"U. Milano"
]
] |
QCD nonrelativistic effective field theories (NREFT) are the modern and most suitable frame to describe heavy quarkonium properties. In this talk I summarize few relevant concepts and some interesting physical applications of NREFT.
|
hep-ph/0103073
|
Wolfgang Cassing
|
W. Cassing (Univ. of Giessen), L.A. Kondratyuk (ITEP Moscow), G.I.
Lykasov and M.V. Rzjanin (JINR Dubna)
|
Open charm enhancement by secondary interactions in relativistic
nucleus-nucleus collisions?
|
14 pages, LaTeX, including 5 postscript figures, submitted to Phys.
Lett. B
|
Phys.Lett. B513 (2001) 1-8
|
10.1016/S0370-2693(01)00744-4
| null |
hep-ph
| null |
We calculate open charm production in $Pb+Pb$ reactions at SPS energies
within the HSD transport approach - which is based on string, quark, diquark
($q, \bar{q}, qq, \bar{q}\bar{q}$) and hadronic degrees of freedom - including
the production of open charm pairs from secondary 'meson'-'baryon' (or
quark-diquark and antiquark-diquark) collisions. It is argued that at collision
energies close to the $c\bar{c}$ pair threshold the dominant production
mechanism is related to the two body (or quasi two body) reactions $\pi N \to
\bar{D} (\bar{D^*}) \Lambda_c, (\Sigma_c)$. Estimates within the framework of
the Quark-Gluon String model suggest cross sections of a few $\mu b$ for $\pi N
\to \bar{D} \Lambda_c$ in the region of 1 GeV above threshold. The dynamical
transport calculations for $Pb + Pb$ at 160 A$\cdot$GeV indicate that the open
charm enhancement reported by the NA50 Collaboration might be due to such
secondary reaction mechanisms.
|
[
{
"created": "Wed, 7 Mar 2001 15:26:30 GMT",
"version": "v1"
}
] |
2009-11-07
|
[
[
"Cassing",
"W.",
"",
"Univ. of Giessen"
],
[
"Kondratyuk",
"L. A.",
"",
"ITEP Moscow"
],
[
"Lykasov",
"G. I.",
"",
"JINR Dubna"
],
[
"Rzjanin",
"M. V.",
"",
"JINR Dubna"
]
] |
We calculate open charm production in $Pb+Pb$ reactions at SPS energies within the HSD transport approach - which is based on string, quark, diquark ($q, \bar{q}, qq, \bar{q}\bar{q}$) and hadronic degrees of freedom - including the production of open charm pairs from secondary 'meson'-'baryon' (or quark-diquark and antiquark-diquark) collisions. It is argued that at collision energies close to the $c\bar{c}$ pair threshold the dominant production mechanism is related to the two body (or quasi two body) reactions $\pi N \to \bar{D} (\bar{D^*}) \Lambda_c, (\Sigma_c)$. Estimates within the framework of the Quark-Gluon String model suggest cross sections of a few $\mu b$ for $\pi N \to \bar{D} \Lambda_c$ in the region of 1 GeV above threshold. The dynamical transport calculations for $Pb + Pb$ at 160 A$\cdot$GeV indicate that the open charm enhancement reported by the NA50 Collaboration might be due to such secondary reaction mechanisms.
|
2311.10360
|
Shuai Xu
|
Xinyue Yin, Shuai Xu and Sibo Zheng
|
Self-interacting dark matter to freeze-in via vector portal
|
18 pages, 6 figures. A refined version to eliminate errors in the
previous version, with new model realization and numerical analysis
| null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
It is challenging to resolve the small-scale problem for dark matter being a
weakly-interacting massive particle. We attempt to address this issue by
proposing a self-interacting freeze-in dark matter via dark photon. In this
model, the dark matter obtains the observed relic abundance via Standard Model
$\gamma$ and $Z$ boson induced freeze-in processes, whereas the dark matter
force mediator has a negligible relic abundance and a lifetime larger than the
age of Universe. We place constraints in classical and resonant regime
resolving the small-scale problem from CMB, $X/\gamma$-ray, Supernova 1987A and
out-of-equilibrium condition. It turns out that the CMB constraint on dark
matter annihilations is satisfied despite large Sommerfeld effect taking place,
while the other constraints are trivially accommodated due to various
millicharge induced suppressions. Finally we briefly discuss future
cosmological tests on such freeze-in dark matter model.
|
[
{
"created": "Fri, 17 Nov 2023 07:28:09 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Nov 2023 02:55:59 GMT",
"version": "v2"
},
{
"created": "Thu, 9 May 2024 03:20:37 GMT",
"version": "v3"
}
] |
2024-05-10
|
[
[
"Yin",
"Xinyue",
""
],
[
"Xu",
"Shuai",
""
],
[
"Zheng",
"Sibo",
""
]
] |
It is challenging to resolve the small-scale problem for dark matter being a weakly-interacting massive particle. We attempt to address this issue by proposing a self-interacting freeze-in dark matter via dark photon. In this model, the dark matter obtains the observed relic abundance via Standard Model $\gamma$ and $Z$ boson induced freeze-in processes, whereas the dark matter force mediator has a negligible relic abundance and a lifetime larger than the age of Universe. We place constraints in classical and resonant regime resolving the small-scale problem from CMB, $X/\gamma$-ray, Supernova 1987A and out-of-equilibrium condition. It turns out that the CMB constraint on dark matter annihilations is satisfied despite large Sommerfeld effect taking place, while the other constraints are trivially accommodated due to various millicharge induced suppressions. Finally we briefly discuss future cosmological tests on such freeze-in dark matter model.
|
2010.03259
|
Per Grafstrom
|
P. Grafstrom and M.G. Ryskin
|
Bethe phase variation due to a non-exponential nuclear amplitude and the
possibility of using a $t$-dependent phase to determine the $\rho$-parameter
from elastic scattering data
|
7 pages, 3 figures
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We evaluate the possible deviation (from the conventional Cahn's result) of
the phase between the one-photon-exchange and the `nuclear' high energy $pp$
scattering amplitudes in a small $t\to 0$ region caused by a more complicated
(not just $exp(Bt)$) behaviour of the nuclear amplitude. Furthermore we look at
the possible role of the $t$-dependence of the $\rho(t) \equiv$ Real/Imaginary
amplitude ratio. It turns out that both effects are rather small - much smaller
than to have any influence on the experimental accuracy of $\rho(t=0)$
extracted from the elastic proton-proton scattering data.
|
[
{
"created": "Wed, 7 Oct 2020 08:22:32 GMT",
"version": "v1"
}
] |
2020-10-08
|
[
[
"Grafstrom",
"P.",
""
],
[
"Ryskin",
"M. G.",
""
]
] |
We evaluate the possible deviation (from the conventional Cahn's result) of the phase between the one-photon-exchange and the `nuclear' high energy $pp$ scattering amplitudes in a small $t\to 0$ region caused by a more complicated (not just $exp(Bt)$) behaviour of the nuclear amplitude. Furthermore we look at the possible role of the $t$-dependence of the $\rho(t) \equiv$ Real/Imaginary amplitude ratio. It turns out that both effects are rather small - much smaller than to have any influence on the experimental accuracy of $\rho(t=0)$ extracted from the elastic proton-proton scattering data.
|
2209.01995
|
Giancarlo Rossi
|
Giancarlo Rossi
|
Elementary particle non-perturbative mass generation. A step towards a
beyond-the-Standard-Model model
|
6 pages, 5 figures, Conference contribution
| null | null | null |
hep-ph hep-th
|
http://creativecommons.org/licenses/by/4.0/
|
We show that a recently discovered non-perturbative field-theoretical
mechanism giving mass to elementary fermions, is also capable of generating a
mass for the electro-weak bosons and can thus be used as a viable alternative
to the Higgs scenario. A detailed analysis of this remarkable feature shows
that the non-perturbatively generated fermion and $W$ masses have the
parametric form $m_{f}\sim C_f(\alpha)\Lambda_{RGI}$ and $M_W\sim g_w
c_w(\alpha)\Lambda_{RGI}$, respectively, where the coefficients $C_f(\alpha)$
and $c_w(\alpha)$ are functions of the gauge couplings, $g_w$ is the weak
coupling and $\Lambda_{\rm RGI}$ is the RGI scale of the theory. In view of
these expressions, we see that to match the experimental values of the top
quark and $W$ masses, we are led to conjecture the existence of a yet
unobserved sector of massive fermions (that we denote Tera-fermions) subjected,
besides ordinary Standard Model interactions, to some kind of super-strong
gauge interactions (Tera-interactions), so that the full theory (SM plus
Tera-particles) will have an RGI scale $\Lambda_{\rm RGI}\equiv \Lambda_T$ in
the TeV region. This approach offers a solution of the mass naturalness problem
(there is no fundamental Higgs), an understanding of the fermion mass hierarchy
and a physical interpretation of the electro-weak scale as a fraction of
$\Lambda_T$.
|
[
{
"created": "Mon, 5 Sep 2022 14:50:57 GMT",
"version": "v1"
}
] |
2022-09-07
|
[
[
"Rossi",
"Giancarlo",
""
]
] |
We show that a recently discovered non-perturbative field-theoretical mechanism giving mass to elementary fermions, is also capable of generating a mass for the electro-weak bosons and can thus be used as a viable alternative to the Higgs scenario. A detailed analysis of this remarkable feature shows that the non-perturbatively generated fermion and $W$ masses have the parametric form $m_{f}\sim C_f(\alpha)\Lambda_{RGI}$ and $M_W\sim g_w c_w(\alpha)\Lambda_{RGI}$, respectively, where the coefficients $C_f(\alpha)$ and $c_w(\alpha)$ are functions of the gauge couplings, $g_w$ is the weak coupling and $\Lambda_{\rm RGI}$ is the RGI scale of the theory. In view of these expressions, we see that to match the experimental values of the top quark and $W$ masses, we are led to conjecture the existence of a yet unobserved sector of massive fermions (that we denote Tera-fermions) subjected, besides ordinary Standard Model interactions, to some kind of super-strong gauge interactions (Tera-interactions), so that the full theory (SM plus Tera-particles) will have an RGI scale $\Lambda_{\rm RGI}\equiv \Lambda_T$ in the TeV region. This approach offers a solution of the mass naturalness problem (there is no fundamental Higgs), an understanding of the fermion mass hierarchy and a physical interpretation of the electro-weak scale as a fraction of $\Lambda_T$.
|
hep-ph/9410333
|
Thomas Mannel
|
Thomas Mannel and Gerhard A. Schuler
|
Heavy Quarkonium Effective Theory
|
52 pages, LaTeX, 3 uuencoded and compressed figures, uses epsf.sty,
CERN-TH.7468/94
|
Z.Phys. C67 (1995) 159-180
|
10.1007/BF01564831
| null |
hep-ph
| null |
We formulate a QCD-based effective theory approach to heavy quarkonia-like
systems as $\bar{c} c$ and $\bar{b} b$ resonances and $B_c$ states. We apply
the method to inclusive decays, working out a few examples in detail.
|
[
{
"created": "Thu, 20 Oct 1994 13:50:54 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Mannel",
"Thomas",
""
],
[
"Schuler",
"Gerhard A.",
""
]
] |
We formulate a QCD-based effective theory approach to heavy quarkonia-like systems as $\bar{c} c$ and $\bar{b} b$ resonances and $B_c$ states. We apply the method to inclusive decays, working out a few examples in detail.
|
hep-ph/9810246
|
Haitham Zaraket
|
Haitham Zaraket
|
Soft dilepton production and hard thermal loops
|
Revtex, postscript figures included with epsf, 6 pages. Talk
presented at the 5th International Workshop on Thermal Field Theories and
their Applications, Regensburg, Germany, August 1998
| null | null |
LAPTH-98/702
|
hep-ph
| null |
The Hard Thermal Loop expansion, is an attractive theory, but it reveals
difficulties when one uses it as a perturbative scheme. To illustrate this we
use the HTL expansion to calculate the two loop corrections for soft virtual
photons. The resulting corrections are of the same order as the 1-loop
correction.
|
[
{
"created": "Mon, 5 Oct 1998 16:30:27 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Oct 1998 14:39:34 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Zaraket",
"Haitham",
""
]
] |
The Hard Thermal Loop expansion, is an attractive theory, but it reveals difficulties when one uses it as a perturbative scheme. To illustrate this we use the HTL expansion to calculate the two loop corrections for soft virtual photons. The resulting corrections are of the same order as the 1-loop correction.
|
hep-ph/0011191
|
Viktor Nikonov
|
A. V. Anisovich, V. V. Anisovich, V. A. Nikonov
|
Quark structure of f0(980) from the radiative decays phi(1020)->gamma
f0(980), gamma eta, gamma eta', gamma pi0 and f0(980)->gamma gamma
|
some typos corrected, Fig 4. presented in more suitable form, some
references are changed
| null | null | null |
hep-ph
| null |
Partial widths of the radiative decays $\phi(1020)\to\gamma f_0(980)$,
$\gamma\eta$, $\gamma\eta'$, $\gamma\pi^0$ and $f_0(980)\to\gamma\gamma$ are
calculated assuming all mesons under consideration to be $q\bar q$ states:
$\phi(1020)$ is dominantly an $s\bar s$ state ($n\bar n$ component $\lesssim
1%$), $\eta$, $\eta'$ and $\pi^0$ are standard $q\bar q$ states, $\eta = n\bar
n\cos\theta - s\bar s\sin\theta$ and $\eta'=n\bar n\sin\theta + s\bar
s\cos\theta$ with $\theta\simeq 37^\circ$, and $f_0(980)$ is the $q\bar q$
meson with the flavour wave function $n\bar n\cos\phi + s\bar s \sin\phi$.
Calculated partial widths for the decays $\phi\to\gamma \eta$, $\gamma\eta'$,
$\gamma\pi^0$ are in a reasonable agreement with experiment. The measured value
of the branching ratio $BR(\phi\to\gamma f_0(980))$ requires $25^\circ\le
|\phi|\le 90^\circ$; for the decay $f_0(980)\to\gamma\gamma$ the agreement with
data is reached at either $77^\circ\le\phi\le 93^\circ$ or
$(-54^\circ)\le\phi\le (-38^\circ)$. Simultaneous analysis of the decays
$\phi(1020)\to\gamma f_0(980)$ and $f_0(980)\to\gamma\gamma$ provides arguments
in favour of the solution with negative mixing angle $\phi =-48^\circ\pm
6^\circ$.
|
[
{
"created": "Wed, 15 Nov 2000 12:52:58 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Nov 2000 13:45:40 GMT",
"version": "v2"
},
{
"created": "Fri, 8 Dec 2000 13:57:38 GMT",
"version": "v3"
},
{
"created": "Tue, 27 Mar 2001 10:05:39 GMT",
"version": "v4"
}
] |
2007-05-23
|
[
[
"Anisovich",
"A. V.",
""
],
[
"Anisovich",
"V. V.",
""
],
[
"Nikonov",
"V. A.",
""
]
] |
Partial widths of the radiative decays $\phi(1020)\to\gamma f_0(980)$, $\gamma\eta$, $\gamma\eta'$, $\gamma\pi^0$ and $f_0(980)\to\gamma\gamma$ are calculated assuming all mesons under consideration to be $q\bar q$ states: $\phi(1020)$ is dominantly an $s\bar s$ state ($n\bar n$ component $\lesssim 1%$), $\eta$, $\eta'$ and $\pi^0$ are standard $q\bar q$ states, $\eta = n\bar n\cos\theta - s\bar s\sin\theta$ and $\eta'=n\bar n\sin\theta + s\bar s\cos\theta$ with $\theta\simeq 37^\circ$, and $f_0(980)$ is the $q\bar q$ meson with the flavour wave function $n\bar n\cos\phi + s\bar s \sin\phi$. Calculated partial widths for the decays $\phi\to\gamma \eta$, $\gamma\eta'$, $\gamma\pi^0$ are in a reasonable agreement with experiment. The measured value of the branching ratio $BR(\phi\to\gamma f_0(980))$ requires $25^\circ\le |\phi|\le 90^\circ$; for the decay $f_0(980)\to\gamma\gamma$ the agreement with data is reached at either $77^\circ\le\phi\le 93^\circ$ or $(-54^\circ)\le\phi\le (-38^\circ)$. Simultaneous analysis of the decays $\phi(1020)\to\gamma f_0(980)$ and $f_0(980)\to\gamma\gamma$ provides arguments in favour of the solution with negative mixing angle $\phi =-48^\circ\pm 6^\circ$.
|
2407.01993
|
Qi-Fang L\"u
|
Qi-Fang L\"u, Yu-Bing Dong, Peng-Nian Shen, Zong-Ye Zhang
|
Analysis of short range interactions between $u/d$ quarks in the $NN$,
$D_{03}$, and $D_{30}$ systems
|
8 pages, 2 figures, comments and suggestions are welcome
| null | null | null |
hep-ph hep-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The dynamic mechanism of short range interaction between $u/d$ quarks is
still an open and challenging problem. In order to reveal this quark dynamics,
we perform a systematic analysis of $NN$, $D_{03}$, and $D_{30}$ systems in the
(extended) chiral SU(3) constituent quark models. By comparing results
calculated with different models and different parameter sets, the effects of
one gluon exchange and vector meson exchange terms are carefully examined. The
results indicate that the vector meson exchange interactions dominate the short
range interactions between $u/d$ quarks, while the small residual one gluon
exchange coupling strength is also allowed.
|
[
{
"created": "Tue, 2 Jul 2024 07:07:10 GMT",
"version": "v1"
}
] |
2024-07-03
|
[
[
"Lü",
"Qi-Fang",
""
],
[
"Dong",
"Yu-Bing",
""
],
[
"Shen",
"Peng-Nian",
""
],
[
"Zhang",
"Zong-Ye",
""
]
] |
The dynamic mechanism of short range interaction between $u/d$ quarks is still an open and challenging problem. In order to reveal this quark dynamics, we perform a systematic analysis of $NN$, $D_{03}$, and $D_{30}$ systems in the (extended) chiral SU(3) constituent quark models. By comparing results calculated with different models and different parameter sets, the effects of one gluon exchange and vector meson exchange terms are carefully examined. The results indicate that the vector meson exchange interactions dominate the short range interactions between $u/d$ quarks, while the small residual one gluon exchange coupling strength is also allowed.
|
0808.1523
|
Paramita Dey
|
Paramita Dey, Anirban Kundu, Biswarup Mukhopadhyaya, Soumitra Nandi
|
Two-loop neutrino masses with large R-parity violating interactions in
supersymmetry
|
Revised version, 25 pages, 16 figures
|
JHEP 0812:100,2008
|
10.1088/1126-6708/2008/12/100
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We attempt to reconcile large trilinear R-parity violating interactions in a
supersymmetric (SUSY) theory with the observed pattern of neutrino masses and
mixing. We show that, with a restricted number of such interaction terms with
the $\lambda'$-type couplings in the range (0.1-1.0), it is possible to forbid
one-loop contributions to the neutrino mass matrix. This is illustrated with
the help of a `working example' where an econnomic choice of SUSY parameters is
made, with three non-vanishing and `large' R-parity violating terms in the
superpotential. The two-loop contributions in such a case can not only generate
the masses in the requisite order but can also lead us to specific allowed
regions of the parameter space.
|
[
{
"created": "Mon, 11 Aug 2008 14:50:46 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Dec 2008 12:22:33 GMT",
"version": "v2"
}
] |
2009-01-16
|
[
[
"Dey",
"Paramita",
""
],
[
"Kundu",
"Anirban",
""
],
[
"Mukhopadhyaya",
"Biswarup",
""
],
[
"Nandi",
"Soumitra",
""
]
] |
We attempt to reconcile large trilinear R-parity violating interactions in a supersymmetric (SUSY) theory with the observed pattern of neutrino masses and mixing. We show that, with a restricted number of such interaction terms with the $\lambda'$-type couplings in the range (0.1-1.0), it is possible to forbid one-loop contributions to the neutrino mass matrix. This is illustrated with the help of a `working example' where an econnomic choice of SUSY parameters is made, with three non-vanishing and `large' R-parity violating terms in the superpotential. The two-loop contributions in such a case can not only generate the masses in the requisite order but can also lead us to specific allowed regions of the parameter space.
|
hep-ph/0311345
|
Matthias Neubert
|
Bjorn O. Lange and Matthias Neubert (Cornell University)
|
Factorization and the Soft Overlap Contribution to Heavy-to-Light Form
Factors
|
30 pages, 6 figures. Erratum added
|
Nucl.Phys. B690 (2004) 249-278; Erratum-ibid. B723 (2005) 201-202
|
10.1016/j.nuclphysb.2004.04.025
|
CLNS-03/1849
|
hep-ph
| null |
Using the formalism of soft-collinear effective theory, a complete separation
of short- and long-distance contributions to heavy-to-light transition form
factors at large recoil is performed. The universal functions $\zeta_M(E)$
parameterizing the ``soft overlap'' contribution to the form factors are
defined in terms of matrix elements in the effective theory. Endpoint
configurations corresponding to kinematic situations where one of the valence
partons in the external mesons carries very small momentum are accounted for in
terms of operators involving soft-collinear messenger fields. They contribute
at leading order in $\Lambda_{\rm QCD}/E$ and spoil factorization. An analysis
of operator mixing and renormalization-group evolution in the effective theory
reveals that the intermediate scale $\sqrt{E\Lambda}$ is without significance
to the soft functions $\zeta_M(E)$, and that the soft overlap contribution does
not receive a significant perturbative (Sudakov) suppression.
|
[
{
"created": "Wed, 26 Nov 2003 20:55:30 GMT",
"version": "v1"
},
{
"created": "Wed, 19 May 2004 19:56:44 GMT",
"version": "v2"
},
{
"created": "Thu, 9 Jun 2005 13:54:03 GMT",
"version": "v3"
}
] |
2010-04-05
|
[
[
"Lange",
"Bjorn O.",
"",
"Cornell University"
],
[
"Neubert",
"Matthias",
"",
"Cornell University"
]
] |
Using the formalism of soft-collinear effective theory, a complete separation of short- and long-distance contributions to heavy-to-light transition form factors at large recoil is performed. The universal functions $\zeta_M(E)$ parameterizing the ``soft overlap'' contribution to the form factors are defined in terms of matrix elements in the effective theory. Endpoint configurations corresponding to kinematic situations where one of the valence partons in the external mesons carries very small momentum are accounted for in terms of operators involving soft-collinear messenger fields. They contribute at leading order in $\Lambda_{\rm QCD}/E$ and spoil factorization. An analysis of operator mixing and renormalization-group evolution in the effective theory reveals that the intermediate scale $\sqrt{E\Lambda}$ is without significance to the soft functions $\zeta_M(E)$, and that the soft overlap contribution does not receive a significant perturbative (Sudakov) suppression.
|
1305.7216
|
Paolo Lipari
|
Paolo Lipari and Maurizio Lusignoli
|
Interpretation of the measurements of total, elastic and diffractive
cross sections at LHC
|
24 pages, 11 figures
|
Eur.Phys.J. C (2013) 73:2630
|
10.1140/epjc/s10052-013-2630-4
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Recently at LHC one has obtained measurements of the total, elastic and
diffractive cross sections in pp collisions at very high energy. The total
cross section is in good agreement with predictions based on a leading behavior
\sigma_{tot} (s) \propto (\ln s/s_0)^2, on the other hand the elastic cross
section is lower than most expectations and the diffractive cross section is
higher. It is remarkable that the ratio
(\sigma_{el} + \sigma_{diff})/\sigma_{tot} calculated combining the results
of the TOTEM and ALICE detectors is 0.495^{+0.05}_{-0.06}, very close to the
maximum theoretically allowed value of 1/2 known as the Miettinen Pumplin
bound. In this work we discuss these results using the frameworks of single and
multi--channel eikonal models, and outline the main difficulties for a
consistent interpretation of the data.
|
[
{
"created": "Thu, 30 May 2013 19:39:37 GMT",
"version": "v1"
},
{
"created": "Sun, 30 Jun 2013 10:24:23 GMT",
"version": "v2"
}
] |
2013-12-17
|
[
[
"Lipari",
"Paolo",
""
],
[
"Lusignoli",
"Maurizio",
""
]
] |
Recently at LHC one has obtained measurements of the total, elastic and diffractive cross sections in pp collisions at very high energy. The total cross section is in good agreement with predictions based on a leading behavior \sigma_{tot} (s) \propto (\ln s/s_0)^2, on the other hand the elastic cross section is lower than most expectations and the diffractive cross section is higher. It is remarkable that the ratio (\sigma_{el} + \sigma_{diff})/\sigma_{tot} calculated combining the results of the TOTEM and ALICE detectors is 0.495^{+0.05}_{-0.06}, very close to the maximum theoretically allowed value of 1/2 known as the Miettinen Pumplin bound. In this work we discuss these results using the frameworks of single and multi--channel eikonal models, and outline the main difficulties for a consistent interpretation of the data.
|
1810.10916
|
Pablo Fern\'andez de Salas
|
P.F. de Salas, S. Pastor, C.A. Ternes, T. Thakore, M. T\'ortola
|
Constraining the invisible neutrino decay with KM3NeT-ORCA
|
23 pages, 5 figures, 3 tables, version published in Physics Letters B
| null |
10.1016/j.physletb.2018.12.066
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Several theories of particle physics beyond the Standard Model consider that
neutrinos can decay. In this work we assume that the standard mechanism of
neutrino oscillations is altered by the decay of the heaviest neutrino mass
state into a sterile neutrino and, depending on the model, a scalar or a
Majoron. We study the sensitivity of the forthcoming KM3NeT-ORCA experiment to
this scenario and find that it could improve the current bounds coming from
oscillation experiments, where three-neutrino oscillations have been
considered, by roughly two orders of magnitude. We also study how the presence
of this neutrino decay can affect the determination of the atmospheric
oscillation parameters $\sin^2\theta_{23}$ and $\Delta m_{31}^2$, as well as
the sensitivity to the neutrino mass ordering.
|
[
{
"created": "Thu, 25 Oct 2018 15:03:32 GMT",
"version": "v1"
},
{
"created": "Sat, 12 Jan 2019 15:00:12 GMT",
"version": "v2"
}
] |
2019-01-15
|
[
[
"de Salas",
"P. F.",
""
],
[
"Pastor",
"S.",
""
],
[
"Ternes",
"C. A.",
""
],
[
"Thakore",
"T.",
""
],
[
"Tórtola",
"M.",
""
]
] |
Several theories of particle physics beyond the Standard Model consider that neutrinos can decay. In this work we assume that the standard mechanism of neutrino oscillations is altered by the decay of the heaviest neutrino mass state into a sterile neutrino and, depending on the model, a scalar or a Majoron. We study the sensitivity of the forthcoming KM3NeT-ORCA experiment to this scenario and find that it could improve the current bounds coming from oscillation experiments, where three-neutrino oscillations have been considered, by roughly two orders of magnitude. We also study how the presence of this neutrino decay can affect the determination of the atmospheric oscillation parameters $\sin^2\theta_{23}$ and $\Delta m_{31}^2$, as well as the sensitivity to the neutrino mass ordering.
|
hep-ph/9808267
|
Jianwei Qiu
|
Jianwei Qiu (Brookhaven National Lab/Iowa State)
|
Probing Multiparton Correlations at CEBAF
|
Latex, 10 pages, plenary talk presented at the workshop on "Physics
and Instrumentation with 6-12 GeV Beams", held at JLab on June 15-18, 1998
| null | null | null |
hep-ph
| null |
In this talk, I explore the possibilities of probing the multiparton
correlation functions at CEBAF at its current energy and the energies with its
future upgrades.
|
[
{
"created": "Sat, 8 Aug 1998 19:40:38 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Qiu",
"Jianwei",
"",
"Brookhaven National Lab/Iowa State"
]
] |
In this talk, I explore the possibilities of probing the multiparton correlation functions at CEBAF at its current energy and the energies with its future upgrades.
|
1604.06267
|
Marco Cirelli
|
Marco Cirelli, Marco Taoso
|
Updated galactic radio constraints on Dark Matter
|
20 pages, 10 figures. v2: some small additions, matches journal
version
| null |
10.1088/1475-7516/2016/07/041
|
IFT-UAM/CSIC-16-035
|
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We perform a detailed analysis of the synchrotron signals produced by Dark
Matter annihilations and decays. We consider different set-ups for the
propagation of electrons and positrons, the galactic magnetic field and Dark
Matter properties. We then confront these signals with radio and microwave
maps, including Planck measurements, from a frequency of 22 MHz up to 70 GHz.
We derive two sets of constraints: conservative and progressive, the latter
based on a modeling of the astrophysical emission. Radio and microwave
constraints are complementary to those obtained with other indirect detection
methods, especially for dark matter annihilating into leptonic channels.
|
[
{
"created": "Thu, 21 Apr 2016 12:00:13 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Aug 2016 06:48:39 GMT",
"version": "v2"
}
] |
2016-08-03
|
[
[
"Cirelli",
"Marco",
""
],
[
"Taoso",
"Marco",
""
]
] |
We perform a detailed analysis of the synchrotron signals produced by Dark Matter annihilations and decays. We consider different set-ups for the propagation of electrons and positrons, the galactic magnetic field and Dark Matter properties. We then confront these signals with radio and microwave maps, including Planck measurements, from a frequency of 22 MHz up to 70 GHz. We derive two sets of constraints: conservative and progressive, the latter based on a modeling of the astrophysical emission. Radio and microwave constraints are complementary to those obtained with other indirect detection methods, especially for dark matter annihilating into leptonic channels.
|
1109.1310
|
Markus Wobisch
|
M. Wobisch, D. Britzger, T. Kluge, K. Rabbertz, F. Stober (fastNLO
Collaboration)
|
Theory-Data Comparisons for Jet Measurements in Hadron-Induced Processes
|
17 pages, 8 figures
| null | null |
DESY 11-150, FERMILAB-PUB-11-418-PPD
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a comprehensive overview of theory-data comparisons for inclusive
jet production. Theory predictions are derived for recent parton distribution
functions and compared with jet data from different hadron-induced processes at
various center-of-mass energies sqrt(s). The comparisons are presented as a
function of jet transverse momentum pT or, alternatively, of the scaling
variable xT = 2pT/sqrt(s).
|
[
{
"created": "Tue, 6 Sep 2011 21:56:46 GMT",
"version": "v1"
}
] |
2011-09-08
|
[
[
"Wobisch",
"M.",
"",
"fastNLO\n Collaboration"
],
[
"Britzger",
"D.",
"",
"fastNLO\n Collaboration"
],
[
"Kluge",
"T.",
"",
"fastNLO\n Collaboration"
],
[
"Rabbertz",
"K.",
"",
"fastNLO\n Collaboration"
],
[
"Stober",
"F.",
"",
"fastNLO\n Collaboration"
]
] |
We present a comprehensive overview of theory-data comparisons for inclusive jet production. Theory predictions are derived for recent parton distribution functions and compared with jet data from different hadron-induced processes at various center-of-mass energies sqrt(s). The comparisons are presented as a function of jet transverse momentum pT or, alternatively, of the scaling variable xT = 2pT/sqrt(s).
|
2201.03779
|
Raghavendra Srikanth Hundi
|
Raghavendra Srikanth Hundi
|
Lepton flavor violating $Z$ and Higgs decays in the scotogenic model
|
25 pages, 8 figures, minor changes; published in EPJC
| null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
In this work, we have studied lepton flavor violating (LFV) decays of $Z$
gauge boson and Higgs boson ($H$) in the scotogenic model. We have computed
branching ratios for the decays $Z\to\ell_\alpha\ell_\beta$ and
$H\to\ell_\alpha\ell_\beta$ in this model. Here, $\ell_\alpha$ and $\ell_\beta$
are different charged lepton fields. After fitting to the neutrino oscillation
observables in the scotogenic model, we have found that the branching ratios
for the LFV decays of $Z$ and $H$ can be as large as $\sim10^{-8}$ and
$\sim10^{-3}$ respectively. However, after satisfying the constraints due to
non-observation of $\ell_\alpha\to\ell_\beta\gamma$ decays, the above mentioned
branching ratio results are found to be suppressed by a factor of
$\sim10^{-7}$.
|
[
{
"created": "Tue, 11 Jan 2022 04:50:11 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Jun 2022 08:05:40 GMT",
"version": "v2"
}
] |
2022-06-07
|
[
[
"Hundi",
"Raghavendra Srikanth",
""
]
] |
In this work, we have studied lepton flavor violating (LFV) decays of $Z$ gauge boson and Higgs boson ($H$) in the scotogenic model. We have computed branching ratios for the decays $Z\to\ell_\alpha\ell_\beta$ and $H\to\ell_\alpha\ell_\beta$ in this model. Here, $\ell_\alpha$ and $\ell_\beta$ are different charged lepton fields. After fitting to the neutrino oscillation observables in the scotogenic model, we have found that the branching ratios for the LFV decays of $Z$ and $H$ can be as large as $\sim10^{-8}$ and $\sim10^{-3}$ respectively. However, after satisfying the constraints due to non-observation of $\ell_\alpha\to\ell_\beta\gamma$ decays, the above mentioned branching ratio results are found to be suppressed by a factor of $\sim10^{-7}$.
|
hep-ph/0012241
|
Fridger Schrempp
|
A. Ringwald (DESY) and F. Schrempp (DESY)
|
Zooming-in on Instantons at HERA
|
13 pages, 12 figures
|
Phys.Lett. B503 (2001) 331-340
|
10.1016/S0370-2693(01)00216-7
|
DESY 00-172
|
hep-ph hep-ex hep-lat
| null |
In view of the intriguing, preliminary search results for instanton-induced
events at HERA from the H1 collaboration, some important remaining theoretical
issues are discussed. Notably, the question is addressed, to which extent the
H1 analysis may be directly compared to our original predictions from
instanton-perturbation theory, since certain fiducial cuts are lacking in the
H1 data. Various theoretical uncertainties are evaluated and their impact on
the observed excess is discussed. An improved understanding of the experimental
findings along with an encouraging over-all agreement with our original
predictions seems to emerge.
|
[
{
"created": "Tue, 19 Dec 2000 11:34:26 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Ringwald",
"A.",
"",
"DESY"
],
[
"Schrempp",
"F.",
"",
"DESY"
]
] |
In view of the intriguing, preliminary search results for instanton-induced events at HERA from the H1 collaboration, some important remaining theoretical issues are discussed. Notably, the question is addressed, to which extent the H1 analysis may be directly compared to our original predictions from instanton-perturbation theory, since certain fiducial cuts are lacking in the H1 data. Various theoretical uncertainties are evaluated and their impact on the observed excess is discussed. An improved understanding of the experimental findings along with an encouraging over-all agreement with our original predictions seems to emerge.
|
hep-ph/0403070
|
Wai-Yee Keung
|
Darwin Chang and Wai-Yee Keung
|
Natural Kobayashi-Maskawa Model of CP Violation and Flavor Physics
|
6 pages and 2 figures, Contribution to ICFP2003, KIAS, Seoul, Korea,
to appear in Korean Journal of Physics
|
J.Korean Phys.Soc.45:S262-S267,2004
| null | null |
hep-ph
| null |
We explore the possible tie between the naturalness of having a very small
strong CP $\theta$ parameter in the Kobayashi-Maskawa Model and the flavor
symmetry. We provide many examples in which the flavor symmetry group at high
energy can naturally give rise to Kobayashi-Maskawa Model at low energy with a
naturally small theta.
|
[
{
"created": "Fri, 5 Mar 2004 21:23:14 GMT",
"version": "v1"
}
] |
2009-09-01
|
[
[
"Chang",
"Darwin",
""
],
[
"Keung",
"Wai-Yee",
""
]
] |
We explore the possible tie between the naturalness of having a very small strong CP $\theta$ parameter in the Kobayashi-Maskawa Model and the flavor symmetry. We provide many examples in which the flavor symmetry group at high energy can naturally give rise to Kobayashi-Maskawa Model at low energy with a naturally small theta.
|
0911.2279
|
Hiroyuki Nishiura
|
Yoshio Koide and Hiroyuki Nishiura
|
How can CP violation in the neutrino sector be large in a
$2\leftrightarrow 3$ symmetric model?
|
15 pages, 7 figures
|
Int.J.Mod.Phys.A25:3661-3673,2010
|
10.1142/S0217751X10049694
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Based on a neutrino mass matrix model in which a 2-3 symmetry is only broken
by a phase parameter, it is investigated how the lepton mixing matrix can
deviate from the so-called tribimaximal mixing under a condition that CP is
maximally violated.
|
[
{
"created": "Thu, 12 Nov 2009 00:20:35 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Dec 2009 06:01:21 GMT",
"version": "v2"
}
] |
2014-11-20
|
[
[
"Koide",
"Yoshio",
""
],
[
"Nishiura",
"Hiroyuki",
""
]
] |
Based on a neutrino mass matrix model in which a 2-3 symmetry is only broken by a phase parameter, it is investigated how the lepton mixing matrix can deviate from the so-called tribimaximal mixing under a condition that CP is maximally violated.
|
hep-ph/0209126
|
Kiyoshi Shiraishi
|
Kiyoshi Shiraishi, Kenji Sakamoto and Nahomi Kan (Yamaguchi
University)
|
Shape of Deconstruction
|
10 pages, 2 figures, RevTeX4. a citation added
|
J.Phys.G29:595-602,2003
|
10.1088/0954-3899/29/4/301
|
Guchi-TP-12
|
hep-ph hep-th
| null |
We construct a six-dimensional Maxwell theory using a latticized extra space,
the continuum limit of which is a shifted torus recently discussed by Dienes.
This toy model exhibits the correspondence between continuum theory and
discrete theory, and give a geometrical insight to theory-space model building.
|
[
{
"created": "Thu, 12 Sep 2002 05:24:40 GMT",
"version": "v1"
},
{
"created": "Fri, 20 Sep 2002 12:03:54 GMT",
"version": "v2"
},
{
"created": "Sun, 19 Jan 2003 10:02:33 GMT",
"version": "v3"
}
] |
2016-09-06
|
[
[
"Shiraishi",
"Kiyoshi",
"",
"Yamaguchi\n University"
],
[
"Sakamoto",
"Kenji",
"",
"Yamaguchi\n University"
],
[
"Kan",
"Nahomi",
"",
"Yamaguchi\n University"
]
] |
We construct a six-dimensional Maxwell theory using a latticized extra space, the continuum limit of which is a shifted torus recently discussed by Dienes. This toy model exhibits the correspondence between continuum theory and discrete theory, and give a geometrical insight to theory-space model building.
|
hep-ph/9612323
|
Oleg Kalashnikov
|
O.K. Kalashnikov
|
Fermi Excitations in Hot and Dense Quark-Gluon Plasma
|
14 pages, latex, no figures
|
Mod.Phys.Lett. A12 (1997) 347-356
|
10.1142/S0217732397000352
|
BI-TP 96/55 (November 1996)
|
hep-ph
| null |
The Fermi excitations in hot and dense quark-gluon plasma are studied in the
Feynman gauge using the temperature Green function technique. We find the four
well-separated branches for the case $m=0$ and establish the additional
splitting between them (the four different masses) when $m\ne 0$. The long
wavelength limit of these excitations is found in the general case of the
massive fermions at finite temperature and densities to give the exact one-loop
spectrum. Simultaneously the many known results are reproduces as its different
limits.
|
[
{
"created": "Wed, 11 Dec 1996 12:21:07 GMT",
"version": "v1"
}
] |
2015-06-25
|
[
[
"Kalashnikov",
"O. K.",
""
]
] |
The Fermi excitations in hot and dense quark-gluon plasma are studied in the Feynman gauge using the temperature Green function technique. We find the four well-separated branches for the case $m=0$ and establish the additional splitting between them (the four different masses) when $m\ne 0$. The long wavelength limit of these excitations is found in the general case of the massive fermions at finite temperature and densities to give the exact one-loop spectrum. Simultaneously the many known results are reproduces as its different limits.
|
1508.07014
|
Giacomo Cacciapaglia
|
Teng Ma and Giacomo Cacciapaglia
|
Fundamental Composite 2HDM: SU(N) with 4 flavours
|
34 pages, 2 figures
| null |
10.1007/JHEP03(2016)211
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a new model of composite Higgs based on a gauged SU(N) group with
4 Dirac fermions in the fundamental representation. At low energy, the model
has a global symmetry SU(4)$\times$SU(4) broken to the diagonal SU(4),
containing 2 Higgs doublets in the coset. We study in detail the generation of
the top mass via 4-fermion interactions, and the issue of the vacuum alignment.
In particular, we prove that, without loss of generality, the vacuum can always
be aligned with one doublet. Under certain conditions on the top pre-Yukawas,
the second doublet, together with the additional triplets, is stable and can
thus play the role of Dark Matter. This model can therefore be an example of
composite inert-2HDM model.
|
[
{
"created": "Thu, 27 Aug 2015 20:14:02 GMT",
"version": "v1"
}
] |
2016-05-04
|
[
[
"Ma",
"Teng",
""
],
[
"Cacciapaglia",
"Giacomo",
""
]
] |
We present a new model of composite Higgs based on a gauged SU(N) group with 4 Dirac fermions in the fundamental representation. At low energy, the model has a global symmetry SU(4)$\times$SU(4) broken to the diagonal SU(4), containing 2 Higgs doublets in the coset. We study in detail the generation of the top mass via 4-fermion interactions, and the issue of the vacuum alignment. In particular, we prove that, without loss of generality, the vacuum can always be aligned with one doublet. Under certain conditions on the top pre-Yukawas, the second doublet, together with the additional triplets, is stable and can thus play the role of Dark Matter. This model can therefore be an example of composite inert-2HDM model.
|
hep-ph/9901340
|
Prabahan K. Kabir
|
P. K. Kabir
|
Observed Asymmetry in $\bar{p}p \to \pi^+ K^- K^0 / \pi^- K^+ \bar{K}^0$
and Relation to Reciprocity
|
8 pages, Latex
|
Phys.Lett.B459:335-340,1999
|
10.1016/S0370-2693(99)00676-0
|
UVA/99-137
|
hep-ph
| null |
The charge-asymmetry observed in a recent CPLEAR experiment was interpreted
by the authors as a direct observation of T-noninvariance. While this is the
simplest and most natural inference, and the observed effect agrees in sign and
magnitude with theoretical expectation, adherents of T-invariance may argue
that other interpretations are also possible. If K^0 and \bar{K}^0 are produced
equally in \bar{p} p annihilation, and T-invariance is assumed to hold, the
asymmetry observed in CPLEAR must be attributed to TCP-noninvariance of kaon
beta-decays. If that were the case, the charge-asymmetry in K_S^0 \to \pi l\nu
decays should be three times larger than the one observed for K_L^0 decays.
|
[
{
"created": "Mon, 18 Jan 1999 17:35:56 GMT",
"version": "v1"
}
] |
2014-11-17
|
[
[
"Kabir",
"P. K.",
""
]
] |
The charge-asymmetry observed in a recent CPLEAR experiment was interpreted by the authors as a direct observation of T-noninvariance. While this is the simplest and most natural inference, and the observed effect agrees in sign and magnitude with theoretical expectation, adherents of T-invariance may argue that other interpretations are also possible. If K^0 and \bar{K}^0 are produced equally in \bar{p} p annihilation, and T-invariance is assumed to hold, the asymmetry observed in CPLEAR must be attributed to TCP-noninvariance of kaon beta-decays. If that were the case, the charge-asymmetry in K_S^0 \to \pi l\nu decays should be three times larger than the one observed for K_L^0 decays.
|
hep-ph/0305164
|
Elvira Gamiz
|
Elvira Gamiz, Joaquim Prades (Granada) and Ignazio Scimemi (Bern)
|
CP-Violating Asymmetries in K^+ -> 3 pi in the Standard Model
|
Invited talk given by J.P. at the 38th Rencontres de Moriond on
Electroweak Interactions and Unified Theories, Les Arcs, France, March 15-22
2003
| null | null |
BUTP-2003-11 CAFPE-18-03 UGFT-148-03
|
hep-ph
| null |
We update the CP-violating asymmetries in K^+ -> 3 pi. In particular we study
Delta g_C and Delta g_N -the asymmetries in the slope g. We emphasize its
complementarity to the direct CP-violation parameter epsilon_K' and the large
sensitivity to the size of the imaginary part of the octet coupling Im G_8 at
lowest order in CHPT. We also give the prospects of a full calculation at
next-to-leading order of this and other CP-violating asymmetries which will be
presented elsewhere.
|
[
{
"created": "Thu, 15 May 2003 17:33:17 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Gamiz",
"Elvira",
"",
"Granada"
],
[
"Prades",
"Joaquim",
"",
"Granada"
],
[
"Scimemi",
"Ignazio",
"",
"Bern"
]
] |
We update the CP-violating asymmetries in K^+ -> 3 pi. In particular we study Delta g_C and Delta g_N -the asymmetries in the slope g. We emphasize its complementarity to the direct CP-violation parameter epsilon_K' and the large sensitivity to the size of the imaginary part of the octet coupling Im G_8 at lowest order in CHPT. We also give the prospects of a full calculation at next-to-leading order of this and other CP-violating asymmetries which will be presented elsewhere.
|
1006.4680
|
Andrea Ferroglia
|
A. Ferroglia, M. Neubert, B. D. Pecjak, and L. L. Yang
|
Infrared Singularities and Soft Gluon Resummation with Massive Partons
|
Talk presented at Loops and Legs in Quantum Field Theory 2010,
Woerlitz, Germany, April 25-30, 2010
|
Nucl.Phys.Proc.Suppl.205-206:98-103,2010
|
10.1016/j.nuclphysbps.2010.08.026
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Infrared divergences of QCD scattering amplitudes can be derived from an
anomalous dimension matrix, which is also an essential ingredient for the
resummation of large logarithms due to soft gluon emissions. We report a recent
analytical calculation of the anomalous dimension matrix with both massless and
massive partons at two-loop level, which describes the two-loop infrared
singularities of any scattering amplitudes with an arbitrary number of massless
and massive partons, and also enables soft gluon resummation at
next-to-next-to-leading-logarithmic order. As an application, we calculate the
infrared poles in the q qbar -> t tbar and gg -> t tbar scattering amplitudes
at two-loop order.
|
[
{
"created": "Thu, 24 Jun 2010 03:33:39 GMT",
"version": "v1"
}
] |
2010-12-13
|
[
[
"Ferroglia",
"A.",
""
],
[
"Neubert",
"M.",
""
],
[
"Pecjak",
"B. D.",
""
],
[
"Yang",
"L. L.",
""
]
] |
Infrared divergences of QCD scattering amplitudes can be derived from an anomalous dimension matrix, which is also an essential ingredient for the resummation of large logarithms due to soft gluon emissions. We report a recent analytical calculation of the anomalous dimension matrix with both massless and massive partons at two-loop level, which describes the two-loop infrared singularities of any scattering amplitudes with an arbitrary number of massless and massive partons, and also enables soft gluon resummation at next-to-next-to-leading-logarithmic order. As an application, we calculate the infrared poles in the q qbar -> t tbar and gg -> t tbar scattering amplitudes at two-loop order.
|
hep-ph/9302318
| null |
P. Nath and R. Arnowitt
|
Predictions in SU(5) Supergravity Grand Unification with Proton
Stability and Relic Density Constraints
|
(An error in the reheating factor is corrected, strengthening the
conclusions, i.e. the region in parameter space where the relic density
constraints are satisfied is enlarged.)
|
Phys.Rev.Lett.70:3696-3699,1993
|
10.1103/PhysRevLett.70.3696
| null |
hep-ph
| null |
It is shown that in the physically interesting domain of the parameter space
of SU(5) supergravity GUT, the Higgs and the Z poles dominate the LSP
annihilation. Here the naive analyses on thermal averaging breaks down and
formulae are derived which give a rigorous treatment over the poles. These
results are then used to show that there exist significant domains in the
parameter space where the constraints of proton stability and cosmology are
simultaneously satisfied. New upper limits on light particle masses are
obtained.
|
[
{
"created": "Fri, 26 Feb 1993 21:43:08 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Apr 1993 22:32:37 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Nath",
"P.",
""
],
[
"Arnowitt",
"R.",
""
]
] |
It is shown that in the physically interesting domain of the parameter space of SU(5) supergravity GUT, the Higgs and the Z poles dominate the LSP annihilation. Here the naive analyses on thermal averaging breaks down and formulae are derived which give a rigorous treatment over the poles. These results are then used to show that there exist significant domains in the parameter space where the constraints of proton stability and cosmology are simultaneously satisfied. New upper limits on light particle masses are obtained.
|
1412.4223
|
Hidekazu Tanaka
|
Hidekazu Tanaka
|
TMD Parton Distributions based on Three-Body Decay Functions in NLL
Order of QCD
|
11 pages, 4 figures
| null |
10.1093/ptep/ptv035
|
RUP-14-19
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Three-body decay functions in space-like parton branches are implemented to
evaluate transverse-momentum-dependent (TMD) parton distribution functions in
the next-to-leading logarithmic (NLL) order of quantum chromodynamics (QCD).
Interference contributions due to the next-to-leading order contribution are
taken into account for the evaluation of the transverse momenta in initial
state parton radiations. Some properties of the decay functions are also
examined. As an example, we compare our results with an algorithm proposed in
Ref.1), in which a transverse momentum distributions are evaluated at the last
step of parton evolutions.
|
[
{
"created": "Sat, 13 Dec 2014 10:36:32 GMT",
"version": "v1"
}
] |
2015-04-08
|
[
[
"Tanaka",
"Hidekazu",
""
]
] |
Three-body decay functions in space-like parton branches are implemented to evaluate transverse-momentum-dependent (TMD) parton distribution functions in the next-to-leading logarithmic (NLL) order of quantum chromodynamics (QCD). Interference contributions due to the next-to-leading order contribution are taken into account for the evaluation of the transverse momenta in initial state parton radiations. Some properties of the decay functions are also examined. As an example, we compare our results with an algorithm proposed in Ref.1), in which a transverse momentum distributions are evaluated at the last step of parton evolutions.
|
1109.1406
|
Xiang Liu
|
Dian-Yong Chen, Xiang Liu and Xue-Qian Li
|
Anomalous dipion invariant mass distribution of the $\Upsilon(4S)$
decays into $\Upsilon(1S) \pi^{+} \pi^{-}$ and $\Upsilon(2S) \pi^{+} \pi^{-}$
|
5 pages, 3 tables and 4 figures. Accepted by Eur. Phys. J. C
|
Eur.Phys.J.C71:1808,2011
|
10.1140/epjc/s10052-011-1808-x
| null |
hep-ph hep-ex nucl-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
To solve the discrepancy between the experimental data on the partial widths
and lineshapes of the dipion emission of $\Upsilon(4S)$ and the theoretical
predictions, we suggest that there is an additional contribution which was not
taken into account in previous calculations. Noticing that the mass of
$\Upsilon(4S)$ is above the production threshold of $B\bar B$, the contribution
of the sequential process $\Upsilon(4S)\to B\bar B\to \Upsilon(nS)+S\to
\Upsilon(nS)+\pi^+\pi^-$ ($n=1,2$) may be sizable, and its interference with
that from the direct production would be important. The goal of this work is to
investigate if a sum of the two contributions with a relative phase indeed
reproduces the data. Our numerical results on the partial widths and the
lineshapes $d\Gamma(\Upsilon(4S)\to
\Upsilon(2S,1S)\pi^+\pi^-)/d(m_{\pi^+\pi^-})$ are satisfactorily consistent
with the measurements, thus the role of this mechanism is confirmed. Moreover,
with the parameters obtained by fitting the data of the Belle and Babar
collaborations, we predict the distributions $d\Gamma(\Upsilon(4S)\to
\Upsilon(2S,1S)\pi^+\pi^-)/d\cos\theta$ which have not been measured yet.
|
[
{
"created": "Wed, 7 Sep 2011 09:59:01 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Nov 2011 12:49:03 GMT",
"version": "v2"
}
] |
2011-12-06
|
[
[
"Chen",
"Dian-Yong",
""
],
[
"Liu",
"Xiang",
""
],
[
"Li",
"Xue-Qian",
""
]
] |
To solve the discrepancy between the experimental data on the partial widths and lineshapes of the dipion emission of $\Upsilon(4S)$ and the theoretical predictions, we suggest that there is an additional contribution which was not taken into account in previous calculations. Noticing that the mass of $\Upsilon(4S)$ is above the production threshold of $B\bar B$, the contribution of the sequential process $\Upsilon(4S)\to B\bar B\to \Upsilon(nS)+S\to \Upsilon(nS)+\pi^+\pi^-$ ($n=1,2$) may be sizable, and its interference with that from the direct production would be important. The goal of this work is to investigate if a sum of the two contributions with a relative phase indeed reproduces the data. Our numerical results on the partial widths and the lineshapes $d\Gamma(\Upsilon(4S)\to \Upsilon(2S,1S)\pi^+\pi^-)/d(m_{\pi^+\pi^-})$ are satisfactorily consistent with the measurements, thus the role of this mechanism is confirmed. Moreover, with the parameters obtained by fitting the data of the Belle and Babar collaborations, we predict the distributions $d\Gamma(\Upsilon(4S)\to \Upsilon(2S,1S)\pi^+\pi^-)/d\cos\theta$ which have not been measured yet.
|
hep-ph/0103080
|
Patricia Ball
|
Patricia Ball and Markus Lazar
|
A Note on Wandzura-Wilczek Relations
|
4 pages RevTex
|
Phys.Lett. B515 (2001) 131-136
|
10.1016/S0370-2693(01)00831-0
|
CERN-TH/2001-55
|
hep-ph
| null |
Wandzura-Wilczek (WW) relations between matrix-elements of bilocal light-ray
operators have recently regained interest in connection with off-forward
scattering processes. Originally derived for matrix elements over leading-twist
operators, their generalization to off-forward and exclusive processes gets
complicated by the presence of higher-twist operators that are total
derivatives of leading-twist ones and do not contribute to forward-scattering.
We demonstrate that, for exclusive matrix-elements, the inclusion of these
operators into WW-relations is essential for fulfilling constraints imposed by
the conformal symmetry of massless QCD.
|
[
{
"created": "Wed, 7 Mar 2001 21:29:08 GMT",
"version": "v1"
}
] |
2009-11-07
|
[
[
"Ball",
"Patricia",
""
],
[
"Lazar",
"Markus",
""
]
] |
Wandzura-Wilczek (WW) relations between matrix-elements of bilocal light-ray operators have recently regained interest in connection with off-forward scattering processes. Originally derived for matrix elements over leading-twist operators, their generalization to off-forward and exclusive processes gets complicated by the presence of higher-twist operators that are total derivatives of leading-twist ones and do not contribute to forward-scattering. We demonstrate that, for exclusive matrix-elements, the inclusion of these operators into WW-relations is essential for fulfilling constraints imposed by the conformal symmetry of massless QCD.
|
hep-ph/0007256
|
Martin Beneke
|
M. Beneke (Aachen), G. Buchalla (CERN), M. Neubert (Cornell) and C.T.
Sachrajda (Southampton)
|
QCD factorization for $B\to\pi K$ decays
|
4 pages, LaTeX, Contribution to ICHEP2000, July 27 - August 2, Osaka,
Japan, to appear in the Proceedings
| null | null |
PITHA 00/13
|
hep-ph
| null |
We examine some consequences of the QCD factorization approach to
non-leptonic B decays into $\pi K$ and $\pi \pi$ final states, including a set
of enhanced power corrections. Among the robust predictions of the approach we
find small strong-interaction phases (with one notable exception) and a pattern
of CP-averaged branching fractions, which in some cases differ significantly
from the current central values reported by the CLEO Collaboration.
|
[
{
"created": "Mon, 24 Jul 2000 11:12:26 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Beneke",
"M.",
"",
"Aachen"
],
[
"Buchalla",
"G.",
"",
"CERN"
],
[
"Neubert",
"M.",
"",
"Cornell"
],
[
"Sachrajda",
"C. T.",
"",
"Southampton"
]
] |
We examine some consequences of the QCD factorization approach to non-leptonic B decays into $\pi K$ and $\pi \pi$ final states, including a set of enhanced power corrections. Among the robust predictions of the approach we find small strong-interaction phases (with one notable exception) and a pattern of CP-averaged branching fractions, which in some cases differ significantly from the current central values reported by the CLEO Collaboration.
|
1002.0623
|
Rasna Rajkhowa
|
R. Rajkhowa
|
Spin-Dependent Dokshitzer-Gribov-Lipatov- Altarelli-Parisi equations and
t-evolution of structure functions in leading order at small-x
|
14 pages, 3 figures
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper the spin-dependent singlet and nonsinglet structure functions
have been obtained by solving Dokshitzer-Gribov-Lipatov-Altarelli-Parisi
evolution equations in leading order in the small x limit. Here we have used
Taylor series expansion and then the particular and unique solution to solve
the evolution equations. We have also calculated t evolutions of deuteron,
proton and neutron structure functions and the results are compared with the
SLAC E-143 Collaboration data.
|
[
{
"created": "Wed, 3 Feb 2010 03:54:40 GMT",
"version": "v1"
}
] |
2010-02-04
|
[
[
"Rajkhowa",
"R.",
""
]
] |
In this paper the spin-dependent singlet and nonsinglet structure functions have been obtained by solving Dokshitzer-Gribov-Lipatov-Altarelli-Parisi evolution equations in leading order in the small x limit. Here we have used Taylor series expansion and then the particular and unique solution to solve the evolution equations. We have also calculated t evolutions of deuteron, proton and neutron structure functions and the results are compared with the SLAC E-143 Collaboration data.
|
1310.1873
|
Maxime Imbeault
|
Bhubanjyoti Bhattacharya, Maxime Imbeault and David London
|
Measurement of $\gamma$ from three-body B decays
|
7 pages, 2 figures, talk presented at EPS-HEP 2013, Stockholm,
Sweden, July 18-24, 2013
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Using the BaBar measurements of the Dalitz plots for the decays $B^0 \to
K^+\pi^0\pi^-$, $B^0 \to K^0\pi^+\pi^-$, $B^+ \to K^+\pi^+\pi^-$, $B^0 \to K^+
K^0 K^-$, and $B^0 \to K^0 K^0 \bar K^0$, we demonstrate that it is possible to
cleanly extract the weak phase $\gamma$. An advantage of this Dalitz-plot
method is that one can obtain many independent measurements of $\gamma$,
thereby reducing its statistical error. An accurate determination of the
errors, however, requires detailed knowledge of the data. Hopefully, an
experimental group will repeat the analysis, and obtain precise values of the
errors.
|
[
{
"created": "Mon, 7 Oct 2013 18:00:42 GMT",
"version": "v1"
}
] |
2013-10-08
|
[
[
"Bhattacharya",
"Bhubanjyoti",
""
],
[
"Imbeault",
"Maxime",
""
],
[
"London",
"David",
""
]
] |
Using the BaBar measurements of the Dalitz plots for the decays $B^0 \to K^+\pi^0\pi^-$, $B^0 \to K^0\pi^+\pi^-$, $B^+ \to K^+\pi^+\pi^-$, $B^0 \to K^+ K^0 K^-$, and $B^0 \to K^0 K^0 \bar K^0$, we demonstrate that it is possible to cleanly extract the weak phase $\gamma$. An advantage of this Dalitz-plot method is that one can obtain many independent measurements of $\gamma$, thereby reducing its statistical error. An accurate determination of the errors, however, requires detailed knowledge of the data. Hopefully, an experimental group will repeat the analysis, and obtain precise values of the errors.
|
2211.10727
|
Yang Ma
|
Tao Han, Adam K. Leibovich, Yang Ma, Xiao-Ze Tan
|
Higgs decay to charmonia and the charm-quark Yukawa coupling
|
6 pages, 5 figures, contribution to proceedings of 41st International
Conference on High Energy physics - ICHEP2022
|
PoS(ICHEP2022)517
|
10.22323/1.414.0517
|
PITT-PACC 2215
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
After the great triumph of the Higgs discovery in 2012, the next target at
the energy frontier will be to study the Higgs properties and to search for the
next scale beyond the SM. Experimentally, the $H\to c \bar{c}$ channel would be
extremely difficult to dig out because of both the weak Yukawa coupling and the
daunting SM di-jet background. We propose to test the charm-quark Yukawa
coupling at the LHC and future hadron colliders with the Higgs boson decay to
$J/\psi$ via the charm-quark fragmentation. Using the non-relativistic quantum
chromodynamics (NRQCD), we study the charmonia production via the Higgs boson
decay channel $ H \to c \ \bar{c} + J/\psi $(or $ \eta_c $), where both the
color-singlet and color-octet contributions are considered. Our result opens
another door to improve determinations at the LHC of the Higgs Yukawa
couplings: the final state from this decay mode is quite distinctive with
$J/\psi\to e^+e^-,\, \mu^+\mu^-$ and the branching fraction is enhanced by the
charm-quark fragmentation mechanism.
|
[
{
"created": "Sat, 19 Nov 2022 15:46:52 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Dec 2022 15:49:04 GMT",
"version": "v2"
}
] |
2022-12-27
|
[
[
"Han",
"Tao",
""
],
[
"Leibovich",
"Adam K.",
""
],
[
"Ma",
"Yang",
""
],
[
"Tan",
"Xiao-Ze",
""
]
] |
After the great triumph of the Higgs discovery in 2012, the next target at the energy frontier will be to study the Higgs properties and to search for the next scale beyond the SM. Experimentally, the $H\to c \bar{c}$ channel would be extremely difficult to dig out because of both the weak Yukawa coupling and the daunting SM di-jet background. We propose to test the charm-quark Yukawa coupling at the LHC and future hadron colliders with the Higgs boson decay to $J/\psi$ via the charm-quark fragmentation. Using the non-relativistic quantum chromodynamics (NRQCD), we study the charmonia production via the Higgs boson decay channel $ H \to c \ \bar{c} + J/\psi $(or $ \eta_c $), where both the color-singlet and color-octet contributions are considered. Our result opens another door to improve determinations at the LHC of the Higgs Yukawa couplings: the final state from this decay mode is quite distinctive with $J/\psi\to e^+e^-,\, \mu^+\mu^-$ and the branching fraction is enhanced by the charm-quark fragmentation mechanism.
|
hep-ph/0310364
|
Stefan Dittmaier
|
K.-P.O.Diener, S.Dittmaier and W.Hollik
|
Electroweak radiative corrections to deep-inelastic neutrino scattering
- implications for NuTeV ?
|
19 pages latex
|
Phys.Rev. D69 (2004) 073005
|
10.1103/PhysRevD.69.073005
|
MPP-2003-48, PSI-PR-03-16
|
hep-ph
| null |
We calculate the O(alpha) electroweak corrections to charged- and
neutral-current deep-inelastic neutrino scattering off an isoscalar target. The
full one-loop-corrected cross sections, including hard photonic corrections,
are evaluated and compared to an earlier result which was used in the NuTeV
analysis. In particular, we compare results that differ in input-parameter
scheme, treatment of real photon radiation and factorization scheme. The
associated shifts in the theoretical prediction for the ratio of neutral- and
charged-current cross sections can be larger than the experimental accuracy of
the NuTeV result.
|
[
{
"created": "Fri, 31 Oct 2003 14:10:39 GMT",
"version": "v1"
}
] |
2009-11-10
|
[
[
"Diener",
"K. -P. O.",
""
],
[
"Dittmaier",
"S.",
""
],
[
"Hollik",
"W.",
""
]
] |
We calculate the O(alpha) electroweak corrections to charged- and neutral-current deep-inelastic neutrino scattering off an isoscalar target. The full one-loop-corrected cross sections, including hard photonic corrections, are evaluated and compared to an earlier result which was used in the NuTeV analysis. In particular, we compare results that differ in input-parameter scheme, treatment of real photon radiation and factorization scheme. The associated shifts in the theoretical prediction for the ratio of neutral- and charged-current cross sections can be larger than the experimental accuracy of the NuTeV result.
|
hep-ph/0107038
|
John R. Hiller
|
S.J. Brodsky, J.R. Hiller, G. McCartor
|
Application of Pauli-Villars regularization and discretized light-cone
quantization to a single-fermion truncation of Yukawa theory
|
21 pages, 7 figures, RevTeX; published version: more extensive data
in the tables of v1
|
Phys.Rev.D64:114023,2001
|
10.1103/PhysRevD.64.114023
|
SLAC-PUB-8890, UMN-D-01-4, SMUHEP/01-07
|
hep-ph
| null |
We apply Pauli-Villars regularization and discretized light-cone quantization
to the nonperturbative solution of (3+1)-dimensional Yukawa theory in a
single-fermion truncation. Three heavy scalars, including two with negative
norm, are used to regulate the theory. The matrix eigenvalue problem is solved
for the lowest-mass state with use of a new, indefinite-metric Lanczos
algorithm. Various observables are extracted from the wave functions, including
average multiplicities and average momenta of constituents, structure
functions, and a form factor slope.
|
[
{
"created": "Wed, 4 Jul 2001 19:40:44 GMT",
"version": "v1"
},
{
"created": "Fri, 26 Oct 2001 19:34:09 GMT",
"version": "v2"
}
] |
2009-09-11
|
[
[
"Brodsky",
"S. J.",
""
],
[
"Hiller",
"J. R.",
""
],
[
"McCartor",
"G.",
""
]
] |
We apply Pauli-Villars regularization and discretized light-cone quantization to the nonperturbative solution of (3+1)-dimensional Yukawa theory in a single-fermion truncation. Three heavy scalars, including two with negative norm, are used to regulate the theory. The matrix eigenvalue problem is solved for the lowest-mass state with use of a new, indefinite-metric Lanczos algorithm. Various observables are extracted from the wave functions, including average multiplicities and average momenta of constituents, structure functions, and a form factor slope.
|
2307.10357
|
Hannah Sch\"afer
|
Hannah Sch\"afer, Marvin Zanke, Yannis Korte, Bastian Kubis
|
The semileptonic decays $\eta^{(\prime)} \to \pi^0 \ell^+ \ell^-$ and
$\eta' \to \eta \ell^+ \ell^-$ in the standard model
|
21 pages, 9 figures, 13 tables; C++ interface for Collier and
Passarino-Veltman decompositions as ancillary files; v2 as published in Phys.
Rev. D
|
Phys. Rev. D 108, 074025 (2023)
|
10.1103/PhysRevD.108.074025
| null |
hep-ph hep-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We perform a theoretical analysis of the semileptonic decays $\eta^{(\prime)}
\to \pi^0 \ell^+ \ell^-$ and $\eta' \to \eta \ell^+ \ell^-$, where $\ell = e,
\mu$, via a charge-conjugation-conserving two-photon mechanism. The underlying
form factors are modeled using vector-meson dominance, phenomenological input,
and $\mathrm{U}(3)$ flavor symmetry. We consider both a monopole and a dipole
model, the latter tailored such that the expected high-energy behavior is
ensured. Furthermore, we benchmark the effect of $S$-wave rescattering
contributions to the decays. We infer significant effects of the form factors
neglected in the literature so far, still finding branching ratios of the
various decays well below the current experimental upper limits.
|
[
{
"created": "Wed, 19 Jul 2023 18:00:00 GMT",
"version": "v1"
},
{
"created": "Tue, 31 Oct 2023 10:22:05 GMT",
"version": "v2"
}
] |
2023-11-01
|
[
[
"Schäfer",
"Hannah",
""
],
[
"Zanke",
"Marvin",
""
],
[
"Korte",
"Yannis",
""
],
[
"Kubis",
"Bastian",
""
]
] |
We perform a theoretical analysis of the semileptonic decays $\eta^{(\prime)} \to \pi^0 \ell^+ \ell^-$ and $\eta' \to \eta \ell^+ \ell^-$, where $\ell = e, \mu$, via a charge-conjugation-conserving two-photon mechanism. The underlying form factors are modeled using vector-meson dominance, phenomenological input, and $\mathrm{U}(3)$ flavor symmetry. We consider both a monopole and a dipole model, the latter tailored such that the expected high-energy behavior is ensured. Furthermore, we benchmark the effect of $S$-wave rescattering contributions to the decays. We infer significant effects of the form factors neglected in the literature so far, still finding branching ratios of the various decays well below the current experimental upper limits.
|
1604.00009
|
Seyda Ipek
|
Seyda Ipek and John March-Russell
|
Baryogenesis via Particle-Antiparticle Oscillations
|
17 pages, 11 figures, refs added, typos fixed
|
Phys. Rev. D 93, 123528 2016
|
10.1103/PhysRevD.93.123528
|
FERMILAB-PUB-16-092-T
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
CP violation, which is crucial for producing the baryon asymmetry of the
Universe, is enhanced in particle-antiparticle oscillations. We study
particle-antiparticle oscillations (of a particle with mass O(100 GeV)) with CP
violation in the early Universe in the presence of interactions with O(ab-fb)
cross-sections. We show that, if baryon-number-violating interactions exist, a
baryon asymmetry can be produced via out-of-equilibrium decays of oscillating
particles. As a concrete example we study a $U(1)_R$-symmetric,
R-parity-violating SUSY model with pseudo-Dirac gauginos, which undergo
particle-antiparticle oscillations. Taking bino to be the lightest
$U(1)_R$-symmetric particle, and assuming it decays via baryon-number-violating
interactions, we show that bino-antibino oscillations can produce the baryon
asymmetry of the Universe.
|
[
{
"created": "Thu, 31 Mar 2016 20:00:01 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Jun 2016 00:09:55 GMT",
"version": "v2"
}
] |
2016-07-01
|
[
[
"Ipek",
"Seyda",
""
],
[
"March-Russell",
"John",
""
]
] |
CP violation, which is crucial for producing the baryon asymmetry of the Universe, is enhanced in particle-antiparticle oscillations. We study particle-antiparticle oscillations (of a particle with mass O(100 GeV)) with CP violation in the early Universe in the presence of interactions with O(ab-fb) cross-sections. We show that, if baryon-number-violating interactions exist, a baryon asymmetry can be produced via out-of-equilibrium decays of oscillating particles. As a concrete example we study a $U(1)_R$-symmetric, R-parity-violating SUSY model with pseudo-Dirac gauginos, which undergo particle-antiparticle oscillations. Taking bino to be the lightest $U(1)_R$-symmetric particle, and assuming it decays via baryon-number-violating interactions, we show that bino-antibino oscillations can produce the baryon asymmetry of the Universe.
|
2210.17396
|
Anatoly Kotikov Vassilievich
|
N.A. Abdulov, A.V. Kotikov, A.V.Lipatov
|
Parametrizations of collinear and k_T-dependent parton densities in a
proton
|
28 pages, 8 figures
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A new type of parametrization for parton distribution functions in a proton,
based on their $Q^2$-evolution at large and small $x$ values, is constructed.
In our analysis, the valence and nonsinglet parts obey the
Gross-Llewellyn-Smith and Gottfried sum rules, respectively. For the singlet
quark and gluon densities momentum conservation is taken into account. Then,
using the Kimber-Martin-Ryskin prescription, we extend the consideration to
Transverse Momentum Dependent (TMD, or unintegrated) gluon and quark
distributions in a proton, which currently plays an important role in a number
of phenomenological applications. The analytical expressions for the latter,
valid for both low and large $x$, are derived for the first time.
|
[
{
"created": "Mon, 31 Oct 2022 15:24:51 GMT",
"version": "v1"
}
] |
2022-11-01
|
[
[
"Abdulov",
"N. A.",
""
],
[
"Kotikov",
"A. V.",
""
],
[
"Lipatov",
"A. V.",
""
]
] |
A new type of parametrization for parton distribution functions in a proton, based on their $Q^2$-evolution at large and small $x$ values, is constructed. In our analysis, the valence and nonsinglet parts obey the Gross-Llewellyn-Smith and Gottfried sum rules, respectively. For the singlet quark and gluon densities momentum conservation is taken into account. Then, using the Kimber-Martin-Ryskin prescription, we extend the consideration to Transverse Momentum Dependent (TMD, or unintegrated) gluon and quark distributions in a proton, which currently plays an important role in a number of phenomenological applications. The analytical expressions for the latter, valid for both low and large $x$, are derived for the first time.
|
hep-ph/9509236
|
Marco Stratmann
|
M. Stratmann, A. Weber (Univ. Dortmund), W. Vogelsang (Rutherford)
|
Spin-dependent non-singlet structure functions in next-to-leading order
|
27 pages, LaTeX, 3 figures
|
Phys.Rev. D53 (1996) 138-149
|
10.1103/PhysRevD.53.138
|
DO-TH 95/15, RAL-TR-95-043
|
hep-ph
| null |
We study in detail the flavor-non-singlet component of polarized structure
functions in the framework of a consistent and complete next-to-leading order
(${\cal O}(\alpha_s))$ analysis. In this context, we discuss some important
features of the calculation of the next-to-leading order corrections.
Particular emphasis is put on the $Q^2$-evolution of sum-rules for the first
moments of the non-singlet structure functions which, as we show, could serve
to explore $SU(2)$ and $SU(3)$ breaking effects in relations between baryonic
$\beta$-decay matrix elements and in the proton's polarized sea. Furthermore we
make predictions for polarized non-singlet structure functions measurable in a
conceivable $\vec{e}\vec{p}$ collider mode of HERA.
|
[
{
"created": "Wed, 6 Sep 1995 14:05:41 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Stratmann",
"M.",
"",
"Univ. Dortmund"
],
[
"Weber",
"A.",
"",
"Univ. Dortmund"
],
[
"Vogelsang",
"W.",
"",
"Rutherford"
]
] |
We study in detail the flavor-non-singlet component of polarized structure functions in the framework of a consistent and complete next-to-leading order (${\cal O}(\alpha_s))$ analysis. In this context, we discuss some important features of the calculation of the next-to-leading order corrections. Particular emphasis is put on the $Q^2$-evolution of sum-rules for the first moments of the non-singlet structure functions which, as we show, could serve to explore $SU(2)$ and $SU(3)$ breaking effects in relations between baryonic $\beta$-decay matrix elements and in the proton's polarized sea. Furthermore we make predictions for polarized non-singlet structure functions measurable in a conceivable $\vec{e}\vec{p}$ collider mode of HERA.
|
1904.06961
|
Raghunath Sahoo
|
Pragati Sahoo, Raghunath Sahoo and Swatantra Kumar Tiwari
|
Wiedemann-Franz Law For Hot QCD Matter in a Color String Percolation
Scenario
|
No change in the MS. arXiv admin note: text overlap with
arXiv:1804.07980
|
Phys. Rev. D 100, 051503 (2019)
|
10.1103/PhysRevD.100.051503
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Transport coefficients serve as important probes in characterizing the QCD
matter created in high-energy heavy-ion collisions. Thermal and electrical
conductivities as transport coefficients have got special significance in
studying the time evolution of the created matter. We have adopted color string
percolation approach for the estimation of thermal conductivity ($\kappa$),
electrical conductivity ($\sigma_{el}$) and their ratio, which is popularly
known as Wiedemann-Franz law in condensed matter physics. The ratio
$\kappa/\sigma_{el}T$, which is also known as Lorenz number ($\mathbb{L}$) is
studied as a function of temperature and is compared with various theoretical
calculations. We observe that the thermal conductivity for hot QCD medium is
almost temperature independent in the present formalism and matches with the
results obtained in ideal equation of state (EOS) for quark-gluon plasma with
fixed coupling constant ($\alpha_s$). The obtained Lorenz number is compared
with the Stefan-Boltzmann limit for an ideal gas. We observe that a hot QCD
medium with color degrees of freedom behaves like a free electron gas.
|
[
{
"created": "Mon, 15 Apr 2019 11:00:37 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Sep 2019 15:32:17 GMT",
"version": "v2"
}
] |
2019-09-25
|
[
[
"Sahoo",
"Pragati",
""
],
[
"Sahoo",
"Raghunath",
""
],
[
"Tiwari",
"Swatantra Kumar",
""
]
] |
Transport coefficients serve as important probes in characterizing the QCD matter created in high-energy heavy-ion collisions. Thermal and electrical conductivities as transport coefficients have got special significance in studying the time evolution of the created matter. We have adopted color string percolation approach for the estimation of thermal conductivity ($\kappa$), electrical conductivity ($\sigma_{el}$) and their ratio, which is popularly known as Wiedemann-Franz law in condensed matter physics. The ratio $\kappa/\sigma_{el}T$, which is also known as Lorenz number ($\mathbb{L}$) is studied as a function of temperature and is compared with various theoretical calculations. We observe that the thermal conductivity for hot QCD medium is almost temperature independent in the present formalism and matches with the results obtained in ideal equation of state (EOS) for quark-gluon plasma with fixed coupling constant ($\alpha_s$). The obtained Lorenz number is compared with the Stefan-Boltzmann limit for an ideal gas. We observe that a hot QCD medium with color degrees of freedom behaves like a free electron gas.
|
hep-ph/0107220
|
Isabella Masina
|
Isabella Masina
|
The problem of neutrino masses in extensions of the Standard Model
|
140 pages, 6 figures; based on PhD thesis work; accepted by Int.
Jour. of Mod. Phys. A
|
Int.J.Mod.Phys.A16:5101-5200,2001
|
10.1142/S0217751X01005456
|
DFPD 01/TH/30
|
hep-ph
| null |
We review the problem of neutrino masses and mixings in the context of Grand
Unified Theories. After a brief summary of the present experimental status of
neutrino physics, we describe how the see-saw mechanism can automatically
account for the large atmospheric mixing angle. We provide two specific
examples where this possibility is realized by means of a flavour symmetry. We
then review in some detail the various severe problems which plague minimal GUT
models (like the doublet-triplet splitting and proton-decay) and which force to
investigate the possibility of constructing more elaborate but realistic
models. We then show an example of a quasi-realistic SUSY SU(5) model which, by
exploiting the crucial presence of an abelian flavour symmetry, does not
require any fine-tuning and predicts a satisfactory phenomenology with respect
to coupling unification, fermion masses and mixings and bounds from proton
decay.
|
[
{
"created": "Fri, 20 Jul 2001 11:56:20 GMT",
"version": "v1"
}
] |
2009-02-23
|
[
[
"Masina",
"Isabella",
""
]
] |
We review the problem of neutrino masses and mixings in the context of Grand Unified Theories. After a brief summary of the present experimental status of neutrino physics, we describe how the see-saw mechanism can automatically account for the large atmospheric mixing angle. We provide two specific examples where this possibility is realized by means of a flavour symmetry. We then review in some detail the various severe problems which plague minimal GUT models (like the doublet-triplet splitting and proton-decay) and which force to investigate the possibility of constructing more elaborate but realistic models. We then show an example of a quasi-realistic SUSY SU(5) model which, by exploiting the crucial presence of an abelian flavour symmetry, does not require any fine-tuning and predicts a satisfactory phenomenology with respect to coupling unification, fermion masses and mixings and bounds from proton decay.
|
0907.1667
|
Yuval Grossman
|
Itzhak Goldman, Yuval Grossman, Shmuel Nussinov
|
QCD effects on "stable" micro black holes at the LHC
|
10 pages
|
JHEP 0912:058,2009
|
10.1088/1126-6708/2009/12/058
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
If Micro Black Holes (MBHs) can be produced at the LHC, they will decay very
fast. We study hypothetical MBHs that do not decay; in particular, QCD effects
on accretion by MBHs that are produced at rest. We explain why accretion of a
nucleon by such MBHs is associated with pion emission. This pion emission
results in a kick to the MBHs, such that their velocities are large enough to
escape the Earth. Our study provides an extra assurance that MBHs which might
be produced at the LHC are not dangerous.
|
[
{
"created": "Thu, 9 Jul 2009 20:16:26 GMT",
"version": "v1"
}
] |
2010-01-07
|
[
[
"Goldman",
"Itzhak",
""
],
[
"Grossman",
"Yuval",
""
],
[
"Nussinov",
"Shmuel",
""
]
] |
If Micro Black Holes (MBHs) can be produced at the LHC, they will decay very fast. We study hypothetical MBHs that do not decay; in particular, QCD effects on accretion by MBHs that are produced at rest. We explain why accretion of a nucleon by such MBHs is associated with pion emission. This pion emission results in a kick to the MBHs, such that their velocities are large enough to escape the Earth. Our study provides an extra assurance that MBHs which might be produced at the LHC are not dangerous.
|
2012.08179
|
Yoshio Koide
|
Yoshio Koide
|
Rare kaon decay $K^+ \rightarrow \pi^- \mu^+ \mu^+$ as the key event for
the right-handed weak interaction effects
|
6 pages, 2 figures
| null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We discuss on the search for the right-handed weak interaction effects in the
SU(2)$_L \times$SU(2)$_R$ model with lepton doublets $(\nu_\ell, \ell^-)_L$ and
$(N_\ell, \ell^-)_R$ ($\ell = e, \mu, \tau)$. We will point out that only the
chance of the observation of the right-handed weak interaction effect will be
in the rare decay $K^+ \rightarrow \pi^- \mu^+ \mu^+$.
|
[
{
"created": "Tue, 15 Dec 2020 09:56:39 GMT",
"version": "v1"
}
] |
2020-12-16
|
[
[
"Koide",
"Yoshio",
""
]
] |
We discuss on the search for the right-handed weak interaction effects in the SU(2)$_L \times$SU(2)$_R$ model with lepton doublets $(\nu_\ell, \ell^-)_L$ and $(N_\ell, \ell^-)_R$ ($\ell = e, \mu, \tau)$. We will point out that only the chance of the observation of the right-handed weak interaction effect will be in the rare decay $K^+ \rightarrow \pi^- \mu^+ \mu^+$.
|
hep-ph/0107269
|
Alessandro Papa
|
A. Papa
|
Recent results in the BFKL theory
|
Talk given at the IX "Blois Workshop", Pruhonice near Prague, June
9-15, 2001; LaTeX, 8 pages, 4 eps figures
| null | null |
DFCAL-TH 01/3
|
hep-ph
| null |
The Balitsky-Fadin-Kuraev-Lipatov (BFKL) approach for the cross sections at
high energy $\sqrt s$ in perturbative QCD is briefly reviewed. The role of
gluon Reggeization in the derivation of the BFKL equation and its compatibility
with $s$-channel unitarity (``bootstrap'') are discussed.
|
[
{
"created": "Thu, 26 Jul 2001 09:57:32 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Papa",
"A.",
""
]
] |
The Balitsky-Fadin-Kuraev-Lipatov (BFKL) approach for the cross sections at high energy $\sqrt s$ in perturbative QCD is briefly reviewed. The role of gluon Reggeization in the derivation of the BFKL equation and its compatibility with $s$-channel unitarity (``bootstrap'') are discussed.
|
hep-ph/0107309
|
Ed Berger
|
Edmond L. Berger (Argonne), Jianwei Qiu, Xiaofei Zhang (Iowa State)
|
QCD Factorized Drell-Yan Cross Section at Large Transverse Momentum
|
36 pages, latex, including 16 figures
|
Phys.Rev. D65 (2002) 034006
|
10.1103/PhysRevD.65.034006
|
ANL-HEP-01-057
|
hep-ph hep-ex nucl-th
| null |
We derive a new factorization formula in perturbative quantum chromodynamics
for the Drell-Yan massive lepton-pair cross section as a function of the
transverse momentum $Q_T$ of the pair. When $Q_T$ is much larger than the
pair's invariant mass $Q$, this factorization formula systematically resums the
logarithmic contributions of the type $\alpha_s^m \ln^m(Q_T^2/Q^2)$ to all
orders in the strong coupling $\alpha_s$. When $Q_T\sim Q$, our formula yields
the same Drell-Yan cross section as conventional fixed order QCD perturbation
theory. We show that resummation is important when the collision energy
$\sqrt{S}$ is large enough and $Q_T\gg Q$, and we argue that perturbative
expansions are more stable and reliable in terms of the modified factorization
formula.
|
[
{
"created": "Mon, 30 Jul 2001 20:08:00 GMT",
"version": "v1"
}
] |
2009-11-07
|
[
[
"Berger",
"Edmond L.",
"",
"Argonne"
],
[
"Qiu",
"Jianwei",
"",
"Iowa State"
],
[
"Zhang",
"Xiaofei",
"",
"Iowa State"
]
] |
We derive a new factorization formula in perturbative quantum chromodynamics for the Drell-Yan massive lepton-pair cross section as a function of the transverse momentum $Q_T$ of the pair. When $Q_T$ is much larger than the pair's invariant mass $Q$, this factorization formula systematically resums the logarithmic contributions of the type $\alpha_s^m \ln^m(Q_T^2/Q^2)$ to all orders in the strong coupling $\alpha_s$. When $Q_T\sim Q$, our formula yields the same Drell-Yan cross section as conventional fixed order QCD perturbation theory. We show that resummation is important when the collision energy $\sqrt{S}$ is large enough and $Q_T\gg Q$, and we argue that perturbative expansions are more stable and reliable in terms of the modified factorization formula.
|
hep-ph/9703405
|
Csaba Balazs
|
C. Balazs and C.-P. Yuan
|
Testing Multiple Gluon Dynamics at the Tevatron
|
9 pages, LaTeX, REVTeX, one EPS figure and epsf.tex included
|
Phys.Rev.Lett. 79 (1997) 2398-2401
|
10.1103/PhysRevLett.79.2398
|
MSUHEP-70317, CTEQ-703
|
hep-ph
| null |
We propose the measurement of the ratio $R_{CSS}(Q_T^{\min}) \equiv
\frac{\sigma (Q_T>Q_T^{\min})}{\sigma _{Total}}$ to study the effects of the
multiple soft gluon radiation, predicted by QCD, on the transverse momentum
($Q_T$) distribution of the weak gauge bosons $W^{\pm }$ and $Z^0$ produced at
the Tevatron. We compare the prediction of the extended Collins-Soper-Sterman
resummation formalism with the next-to-leading and next-to-next-to-leading
order calculations. We show that both the rich dynamics of the QCD multiple
soft gluon radiation and the non-perturbative sector of QCD can be tested by
measuring $R_{CSS}$.
|
[
{
"created": "Tue, 25 Mar 1997 00:25:55 GMT",
"version": "v1"
}
] |
2009-10-30
|
[
[
"Balazs",
"C.",
""
],
[
"Yuan",
"C. -P.",
""
]
] |
We propose the measurement of the ratio $R_{CSS}(Q_T^{\min}) \equiv \frac{\sigma (Q_T>Q_T^{\min})}{\sigma _{Total}}$ to study the effects of the multiple soft gluon radiation, predicted by QCD, on the transverse momentum ($Q_T$) distribution of the weak gauge bosons $W^{\pm }$ and $Z^0$ produced at the Tevatron. We compare the prediction of the extended Collins-Soper-Sterman resummation formalism with the next-to-leading and next-to-next-to-leading order calculations. We show that both the rich dynamics of the QCD multiple soft gluon radiation and the non-perturbative sector of QCD can be tested by measuring $R_{CSS}$.
|
hep-ph/9808250
|
G. V. Vlasov
|
G.V. Vlasov (Landau)
|
The shock waves in relativistic superfluid
|
14 pages, Latex, 1 table; broadn. abstr. in rev. vers
| null | null | null |
hep-ph
| null |
We consider the discontinuities in a two-constituent relativistic superfluid.
In the acoustic limit they degenerate into the first and second sound which are
independent up to the second-order linear approximation. Inclusion of the
quadratic deviations relates to the small-amplitude shock. Particularly we
consider a plane shock at low temperature when the phonon excitations
contribute to the normal constituent. So we found the generalization of the
temperature increment and acoustic wave velocity in relativistic superfluid.
The fourth sound speed is also calculated.
|
[
{
"created": "Thu, 6 Aug 1998 15:49:24 GMT",
"version": "v1"
},
{
"created": "Thu, 6 May 1999 07:54:58 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Vlasov",
"G. V.",
"",
"Landau"
]
] |
We consider the discontinuities in a two-constituent relativistic superfluid. In the acoustic limit they degenerate into the first and second sound which are independent up to the second-order linear approximation. Inclusion of the quadratic deviations relates to the small-amplitude shock. Particularly we consider a plane shock at low temperature when the phonon excitations contribute to the normal constituent. So we found the generalization of the temperature increment and acoustic wave velocity in relativistic superfluid. The fourth sound speed is also calculated.
|
1601.04678
|
Wei Chao
|
Wei Chao
|
The Diphoton Excess Inspired Electroweak Baryogenesis
|
7 pages, 5 figures
| null | null |
ACFI-T16-03
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A resonance in the diphoton channel with invariant mass $m_{\gamma \gamma} =
750$ GeV was claimed by the ATLAS and CMS collaborations at the run-2 LHC with
$\sqrt{s}=13$ TeV. In this paper, we explain this diphoton excess as a
pseudo-scalar singlet, which is produced at the LHC through gluon fusion with
exotic scalar quarks running in the loop. We point out the scalar singlet might
trigger a two-step electroweak phase transition, which can be strongly first
oder. By assuming there are CP violations associated with interactions of the
scalar quarks, the model is found to be able to generate adequate baryon
asymmetry of the Universe through the electroweak baryogenesis mechanism.
Constraints on the model are studied.
|
[
{
"created": "Mon, 18 Jan 2016 20:08:41 GMT",
"version": "v1"
}
] |
2016-01-19
|
[
[
"Chao",
"Wei",
""
]
] |
A resonance in the diphoton channel with invariant mass $m_{\gamma \gamma} = 750$ GeV was claimed by the ATLAS and CMS collaborations at the run-2 LHC with $\sqrt{s}=13$ TeV. In this paper, we explain this diphoton excess as a pseudo-scalar singlet, which is produced at the LHC through gluon fusion with exotic scalar quarks running in the loop. We point out the scalar singlet might trigger a two-step electroweak phase transition, which can be strongly first oder. By assuming there are CP violations associated with interactions of the scalar quarks, the model is found to be able to generate adequate baryon asymmetry of the Universe through the electroweak baryogenesis mechanism. Constraints on the model are studied.
|
1708.05020
|
Thomas Mehen
|
Thomas Mehen (Duke U.)
|
Implications of Heavy Quark-Diquark Symmetry for Excited Doubly Heavy
Baryons and Tetraquarks
|
10 pages, version accepted in PRD
|
Phys. Rev. D 96, 094028 (2017)
|
10.1103/PhysRevD.96.094028
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We give heavy quark-diquark symmetry predictions for doubly heavy baryons and
tetraquarks in light of the recent discovery of the $\Xi_{cc}^{++}$ by LHCb.
For five excited doubly charm baryons that are predicted to lie below the
$\Lambda_c D$ threshold, we give predictions for their electromagnetic and
strong decays using a previously developed chiral Lagrangian with heavy
quark-diquark symmetry. Based on the mass of the $\Xi_{cc}^{++}$, the existence
of a doubly heavy bottom $I=0$ tetraquark that is stable to the strong and
electromagnetic decays has been predicted. If the mass of this state is below
10405 MeV, as predicted in some models, we argue using heavy quark-diquark
symmetry that the $J^P=1^+$ $I=1$ doubly bottom tetraquark state will lie just
below the open bottom threshold and likely be a narrow state as well. In this
scenario, we compute strong decay width for this state using a new Lagrangian
for tetraquarks which is related to the singly heavy baryon Lagrangian by heavy
quark-diquark symmetry.
|
[
{
"created": "Wed, 16 Aug 2017 18:04:41 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Aug 2017 02:43:05 GMT",
"version": "v2"
},
{
"created": "Tue, 24 Oct 2017 18:19:49 GMT",
"version": "v3"
}
] |
2017-12-06
|
[
[
"Mehen",
"Thomas",
"",
"Duke U."
]
] |
We give heavy quark-diquark symmetry predictions for doubly heavy baryons and tetraquarks in light of the recent discovery of the $\Xi_{cc}^{++}$ by LHCb. For five excited doubly charm baryons that are predicted to lie below the $\Lambda_c D$ threshold, we give predictions for their electromagnetic and strong decays using a previously developed chiral Lagrangian with heavy quark-diquark symmetry. Based on the mass of the $\Xi_{cc}^{++}$, the existence of a doubly heavy bottom $I=0$ tetraquark that is stable to the strong and electromagnetic decays has been predicted. If the mass of this state is below 10405 MeV, as predicted in some models, we argue using heavy quark-diquark symmetry that the $J^P=1^+$ $I=1$ doubly bottom tetraquark state will lie just below the open bottom threshold and likely be a narrow state as well. In this scenario, we compute strong decay width for this state using a new Lagrangian for tetraquarks which is related to the singly heavy baryon Lagrangian by heavy quark-diquark symmetry.
|
2312.00822
|
Mrinal Kumar Das
|
Ankita Kakoti, Mrinal Kumar Das
|
$M_{W_R}$ dependence of leptogenesis in Minimal Left-Right Symmetric
Model with different strengths of Type-II seesaw mass
|
43 pages, added more figures and references. To appear in Journal of
High Energy Physics (JHEP)
| null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by-sa/4.0/
|
Left Right Symmetric Model (LRSM) being an extension of the Standard model of
particle physics incorporates within itself Type-I and Type-II seesaw mass
terms naturally. Both the mass terms can have significant amount of
contribution to the resulting light neutrino mass within the model and hence on
the different phenomenology associated within. In this paper, we have
thoroughly analyzed and discussed the implications of specifying different
weightages to the type-I and type-II mass terms and also the study has been
carried out for different values of $M_{W_R}$ which is mass of the right-handed
gauge boson. This paper also gives a deeper insight into the new physics
contributions of Neutrinoless Double Beta Decay $(0\nu\beta\beta)$ and their
variations with the net baryon asymmetry arising out of the model. Therefore,
the main objective of the present paper rests on investigating the implications
of imposing different weightage to the type-I and type-II seesaw terms and
different values of $M_{W_R}$ on the new physics contributions of
$0\nu\beta\beta$ and net baryon asymmetry arising out as a result of resonant
leptogenesis. LRSM in this work has been realized using modular group of level
3, $\Gamma(3)$ which is isomorphic to non-abelian discrete symmetry group
$A_4$, the advantage being the non-requirement of flavons within the model and
hence maintaining the minimality of the model.
|
[
{
"created": "Thu, 30 Nov 2023 09:38:58 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Mar 2024 04:32:29 GMT",
"version": "v2"
}
] |
2024-03-05
|
[
[
"Kakoti",
"Ankita",
""
],
[
"Das",
"Mrinal Kumar",
""
]
] |
Left Right Symmetric Model (LRSM) being an extension of the Standard model of particle physics incorporates within itself Type-I and Type-II seesaw mass terms naturally. Both the mass terms can have significant amount of contribution to the resulting light neutrino mass within the model and hence on the different phenomenology associated within. In this paper, we have thoroughly analyzed and discussed the implications of specifying different weightages to the type-I and type-II mass terms and also the study has been carried out for different values of $M_{W_R}$ which is mass of the right-handed gauge boson. This paper also gives a deeper insight into the new physics contributions of Neutrinoless Double Beta Decay $(0\nu\beta\beta)$ and their variations with the net baryon asymmetry arising out of the model. Therefore, the main objective of the present paper rests on investigating the implications of imposing different weightage to the type-I and type-II seesaw terms and different values of $M_{W_R}$ on the new physics contributions of $0\nu\beta\beta$ and net baryon asymmetry arising out as a result of resonant leptogenesis. LRSM in this work has been realized using modular group of level 3, $\Gamma(3)$ which is isomorphic to non-abelian discrete symmetry group $A_4$, the advantage being the non-requirement of flavons within the model and hence maintaining the minimality of the model.
|
hep-ph/9806394
|
Agustin Sabio Vera
|
J.R.Forshaw and A.Sabio Vera
|
QCD coherence and jet rates in small x deep inelastic scattering
|
14 pages. Extensively rewritten. To be published in Physics Letters B
|
Phys.Lett.B440:141-150,1998
|
10.1016/S0370-2693(98)01090-9
|
MC-TH-98-10
|
hep-ph
| null |
The contributions to the deep inelastic scattering structure function which
arise from emission of zero, one, two or three resolvable gluons and any number
of unresolvable ones are computed to order ${\bar \alpha}_{S}^{3}$. Coherence
effects are taken into account via angular ordering and are demonstrated to
yield (at the leading logarithm level) the identical results to those obtained
assuming the multi-Regge kinematics of BFKL.
|
[
{
"created": "Wed, 17 Jun 1998 13:42:02 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Aug 1998 14:04:05 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Forshaw",
"J. R.",
""
],
[
"Vera",
"A. Sabio",
""
]
] |
The contributions to the deep inelastic scattering structure function which arise from emission of zero, one, two or three resolvable gluons and any number of unresolvable ones are computed to order ${\bar \alpha}_{S}^{3}$. Coherence effects are taken into account via angular ordering and are demonstrated to yield (at the leading logarithm level) the identical results to those obtained assuming the multi-Regge kinematics of BFKL.
|
2309.06482
|
Katarina Bleau
|
Katarina Bleau, Joseph Bramante, Christopher Cappiello
|
How Effective is $N_{eff}$ at Discovering Dark Radiation in a Cosmology
with Heavy Particle Decay?
|
Main text 15 pages and 6 figures, Appendix 3 pages
| null | null | null |
hep-ph astro-ph.CO hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Any light relic which was in thermal equilibrium with the Standard Model
before it freezes out results in a shift in the effective number of neutrino
species, $N_{eff}$. This quantity is being measured with increasing precision,
and planned experiments would seemingly rule out light particles beyond the
Standard Model, even for rather high temperature light particle freeze out.
Here we explore how these bounds are loosened if the energy density of the
light particles is diluted with respect to that of Standard Model radiation,
which can happen if a heavy particle decays into the Standard Model bath after
the light particle freezes out. After calculating how heavy state decays alter
$N_{eff}$ for light particles beyond the Standard Model, we focus in particular
on the case that the heavy decaying particle is a gravitino, and use current
bounds on $N_{eff}$ to place constraints on the gravitino mass and the
branching ratio into light particles for different values of the reheating
temperature of the Universe.
|
[
{
"created": "Tue, 12 Sep 2023 18:00:11 GMT",
"version": "v1"
}
] |
2023-09-14
|
[
[
"Bleau",
"Katarina",
""
],
[
"Bramante",
"Joseph",
""
],
[
"Cappiello",
"Christopher",
""
]
] |
Any light relic which was in thermal equilibrium with the Standard Model before it freezes out results in a shift in the effective number of neutrino species, $N_{eff}$. This quantity is being measured with increasing precision, and planned experiments would seemingly rule out light particles beyond the Standard Model, even for rather high temperature light particle freeze out. Here we explore how these bounds are loosened if the energy density of the light particles is diluted with respect to that of Standard Model radiation, which can happen if a heavy particle decays into the Standard Model bath after the light particle freezes out. After calculating how heavy state decays alter $N_{eff}$ for light particles beyond the Standard Model, we focus in particular on the case that the heavy decaying particle is a gravitino, and use current bounds on $N_{eff}$ to place constraints on the gravitino mass and the branching ratio into light particles for different values of the reheating temperature of the Universe.
|
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