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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
hep-ph/9712447
|
Christian Weiss
|
C. Weiss and K. Goeke
|
Self-consistent calculation of parton distributions at low normalization
point in the chiral quark-soliton model
|
14 pages, LaTeX, 4 figures included using epsf
| null | null |
RUB-TPII-12/97
|
hep-ph
| null |
We calculate the isosinglet unpolarized quark-- and antiquark distributions
at a low normalization point in the large--$N_c$ limit. The nucleon is
described as a self-consistent soliton solution of the effective chiral theory.
The ultraviolet cutoff is implemented by a Pauli-Villars subtraction. The quark
and antiquark distributions satisfy the momentum as well as the baryon number
sum rule, corresponding to ``constituent'' quarks whose structure is not yet
resolved at the low scale. Already at this level a sizable number of antiquarks
is present.
|
[
{
"created": "Thu, 18 Dec 1997 23:58:33 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Weiss",
"C.",
""
],
[
"Goeke",
"K.",
""
]
] |
We calculate the isosinglet unpolarized quark-- and antiquark distributions at a low normalization point in the large--$N_c$ limit. The nucleon is described as a self-consistent soliton solution of the effective chiral theory. The ultraviolet cutoff is implemented by a Pauli-Villars subtraction. The quark and antiquark distributions satisfy the momentum as well as the baryon number sum rule, corresponding to ``constituent'' quarks whose structure is not yet resolved at the low scale. Already at this level a sizable number of antiquarks is present.
|
hep-ph/0106273
|
Bodenmueller
|
H. Fritzsch
|
The Breaking of Isospin and the rho-omega-System
|
6 pages, style file appolb.cls included
| null |
10.1142/9789812811240_0020
|
LMU 01/07
|
hep-ph
| null |
Simple quark models for the low lying vector mesons suggest a mixing between
the u- and d-flavors and a violation of the isospin symmetry for the rho-omega
system much stronger than observed. It is shown that the chiral dynamics,
especially the QCD anomaly, is responsible for a restoration of the isospin
symmetry in the rho-omega system.
|
[
{
"created": "Mon, 25 Jun 2001 13:13:17 GMT",
"version": "v1"
}
] |
2016-11-23
|
[
[
"Fritzsch",
"H.",
""
]
] |
Simple quark models for the low lying vector mesons suggest a mixing between the u- and d-flavors and a violation of the isospin symmetry for the rho-omega system much stronger than observed. It is shown that the chiral dynamics, especially the QCD anomaly, is responsible for a restoration of the isospin symmetry in the rho-omega system.
|
1406.3001
|
Gerardo Depaola
|
G. O. Depaola, M. L. Iparraguirre D. Palacios
|
About electrons and position in Triplet Production: some remarks
|
22 pages and 17 figures
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Taking into account the increasing interest in measuring high energy gamma
ray polarization, Boldishev et. at. \cite{[Boldy]} published an extensive and
very comprehensive work on the possibility of using the recoil electrons in the
production of pairs on electrons. However, this work is based on using only 2
Feynmann diagrams of the 8 that the process has. This eliminates the difficulty
of distinguishing, in the theory, which is the recoil electron and which is the
created
In this work we have analyzed the eight Feynman diagrams and we have shown
that for energies lower to $\sim 1000mc^2$, the assumption just described is
not a good approximation, so we propose a different way to work \cite{Marcos}:
we classify the electrons into the less energetic and the most energetic ones
without taking into account their origin. Under these conditions (lower or
higher energy value), we have calculated the contribution of the different
diagrams to the distribution(we compare the sum of them with that obtained by
Haug \cite{Haug_e+}\cite{Haug_e-}, and how these distributions are modified by
introducing a threshold for the momentum detection for electrons.
For the study of polarization we presented on the angular distribution of
particles for high-energy gamma rays (where only Borsellino diagrams
predominate). Our results on the azimuthal distribution show that it is highly
influenced by the orientation (in the plane perpendicular to the direction of
the photon), prior to the interaction, that the polarization vector has with
respect to the position of the electron in whose field the pair will be
generated.
|
[
{
"created": "Wed, 11 Jun 2014 19:22:14 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Dec 2019 14:47:49 GMT",
"version": "v2"
},
{
"created": "Fri, 17 Jul 2020 19:50:34 GMT",
"version": "v3"
}
] |
2020-07-21
|
[
[
"Depaola",
"G. O.",
""
],
[
"Palacios",
"M. L. Iparraguirre D.",
""
]
] |
Taking into account the increasing interest in measuring high energy gamma ray polarization, Boldishev et. at. \cite{[Boldy]} published an extensive and very comprehensive work on the possibility of using the recoil electrons in the production of pairs on electrons. However, this work is based on using only 2 Feynmann diagrams of the 8 that the process has. This eliminates the difficulty of distinguishing, in the theory, which is the recoil electron and which is the created In this work we have analyzed the eight Feynman diagrams and we have shown that for energies lower to $\sim 1000mc^2$, the assumption just described is not a good approximation, so we propose a different way to work \cite{Marcos}: we classify the electrons into the less energetic and the most energetic ones without taking into account their origin. Under these conditions (lower or higher energy value), we have calculated the contribution of the different diagrams to the distribution(we compare the sum of them with that obtained by Haug \cite{Haug_e+}\cite{Haug_e-}, and how these distributions are modified by introducing a threshold for the momentum detection for electrons. For the study of polarization we presented on the angular distribution of particles for high-energy gamma rays (where only Borsellino diagrams predominate). Our results on the azimuthal distribution show that it is highly influenced by the orientation (in the plane perpendicular to the direction of the photon), prior to the interaction, that the polarization vector has with respect to the position of the electron in whose field the pair will be generated.
|
1010.4556
|
Leonard Gamberg
|
Leonard Gamberg, Asmita Mukherjee, and Piet J. Mulders
|
A model independent analysis of gluonic pole matrix elements and
universality of TMD fragmentation functions
|
5 pages, 5 figures, version to appear in Phys. Rev. D
|
Phys.Rev.D83:071503,2011
|
10.1103/PhysRevD.83.071503
| null |
hep-ph hep-ex hep-th nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Gluonic pole matrix elements explain the appearance of single spin
asymmetries (SSA) in high-energy scattering processes. They involve a
combination of operators which are odd under time reversal (T-odd). Such matrix
elements appear in principle both for parton distribution functions and parton
fragmentation functions. We show that for parton fragmentation functions these
gluonic pole matrix elements vanish as a consequence of the analytic structure
of scattering amplitudes in Quantum Chromodynamics. This result is important in
the study of the universality of transverse momentum dependent (TMD)
fragmentation functions.
|
[
{
"created": "Thu, 21 Oct 2010 19:11:48 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Feb 2011 16:26:10 GMT",
"version": "v2"
},
{
"created": "Wed, 23 Mar 2011 17:01:13 GMT",
"version": "v3"
}
] |
2011-05-05
|
[
[
"Gamberg",
"Leonard",
""
],
[
"Mukherjee",
"Asmita",
""
],
[
"Mulders",
"Piet J.",
""
]
] |
Gluonic pole matrix elements explain the appearance of single spin asymmetries (SSA) in high-energy scattering processes. They involve a combination of operators which are odd under time reversal (T-odd). Such matrix elements appear in principle both for parton distribution functions and parton fragmentation functions. We show that for parton fragmentation functions these gluonic pole matrix elements vanish as a consequence of the analytic structure of scattering amplitudes in Quantum Chromodynamics. This result is important in the study of the universality of transverse momentum dependent (TMD) fragmentation functions.
|
1501.01124
|
Abdel Nasser Tawfik
|
Abdel Nasser Tawfik (Egyptian Ctr. Theor. Phys., Cairo and WLCAPP,
Cairo), Niseem Magdy (WLCAPP, Cairo and Brookhaven Natl. Lab)
|
SU(3) Polyakov Linear $\sigma$-Model in Magnetic Field: Thermodynamics,
Higher-Order Moments, Chiral Phase Structure and Meson Masses
|
35 pages and 18 figures with 59 eps-graphs to appear in Phys. Rev. C.
arXiv admin note: text overlap with arXiv:1406.7488
|
Phys. Rev. C 91, 015206 (2015)
|
10.1103/PhysRevC.91.015206
|
ECTP-2014-06, WLCAPP-2014-06
|
hep-ph hep-lat
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Effects of external magnetic field on various properties of the quantum
chromodynamics under extreme conditions of temperature and density have been
analysed. To this end, we use SU(3) Polyakov linear sigma-model and assume that
the external magnetic field eB adds some restrictions to the quarks energy due
to the existence of free charges in the plasma phase. In doing this, we apply
the Landau theory of quantization. This requires an additional temperature to
drive the system through the chiral phase-transition. Accordingly, the
dependence of the critical temperature of chiral and confinement
phase-transitions on the magnetic field is characterized. Based on this, we
have studied the thermal evolution of thermodynamic quantities and the first
four higher-order moment of particle multiplicity. Having all these
calculations, we have studied the effects of magnetic field on chiral
phase-transition. We found that both critical temperature T_c and critical
chemical potential increase with increasing the magnetic field eB. Last but not
least, the magnetic effects of the thermal evolution of four scalar and four
pseudoscalar meson states are studied. We concluded that the meson masses
decrease as the temperature increases till T_c. Then, the vacuum effect becomes
dominant and rapidly increases with the temperature T. At low T, the scalar
meson masses normalized to the lowest Matsubara frequency rapidly decreases as
T increases. Then, starting from T_c, we find that the thermal dependence
almost vanishes. Furthermore, the meson masses increase with increasing
magnetic field. This gives characteristic phase diagram of T vs. external
magnetic field $B. At high T, we find that the masses of almost all meson
states become temperature independent. It is concluded that the various meson
states likely have different T_c's.
|
[
{
"created": "Tue, 6 Jan 2015 10:05:23 GMT",
"version": "v1"
}
] |
2015-01-30
|
[
[
"Tawfik",
"Abdel Nasser",
"",
"Egyptian Ctr. Theor. Phys., Cairo and WLCAPP,\n Cairo"
],
[
"Magdy",
"Niseem",
"",
"WLCAPP, Cairo and Brookhaven Natl. Lab"
]
] |
Effects of external magnetic field on various properties of the quantum chromodynamics under extreme conditions of temperature and density have been analysed. To this end, we use SU(3) Polyakov linear sigma-model and assume that the external magnetic field eB adds some restrictions to the quarks energy due to the existence of free charges in the plasma phase. In doing this, we apply the Landau theory of quantization. This requires an additional temperature to drive the system through the chiral phase-transition. Accordingly, the dependence of the critical temperature of chiral and confinement phase-transitions on the magnetic field is characterized. Based on this, we have studied the thermal evolution of thermodynamic quantities and the first four higher-order moment of particle multiplicity. Having all these calculations, we have studied the effects of magnetic field on chiral phase-transition. We found that both critical temperature T_c and critical chemical potential increase with increasing the magnetic field eB. Last but not least, the magnetic effects of the thermal evolution of four scalar and four pseudoscalar meson states are studied. We concluded that the meson masses decrease as the temperature increases till T_c. Then, the vacuum effect becomes dominant and rapidly increases with the temperature T. At low T, the scalar meson masses normalized to the lowest Matsubara frequency rapidly decreases as T increases. Then, starting from T_c, we find that the thermal dependence almost vanishes. Furthermore, the meson masses increase with increasing magnetic field. This gives characteristic phase diagram of T vs. external magnetic field $B. At high T, we find that the masses of almost all meson states become temperature independent. It is concluded that the various meson states likely have different T_c's.
|
hep-ph/9404296
|
Matthias Neubert
|
M. Neubert
|
Heavy Quark Masses, Mixing Angles, and Spin-Flavour Symmetry
|
(Lectures presented at TASI-93, Boulder, Colorado, 1993), 83 pages,
18 figures available as uu-encoded file, CERN-TH.7225/94
| null |
10.1142/9789814503785_0004
| null |
hep-ph
| null |
In a series of three lectures, I review the theory and phenomenology of heavy
quark masses and mixing angles and the status of their determination. In
addition, I give an introduction to heavy quark symmetry, with the main
emphasis on the development of heavy quark effective field theory and its
application to obtain a model-independent determination of $|V_{cb}|$.
|
[
{
"created": "Tue, 19 Apr 1994 16:51:39 GMT",
"version": "v1"
}
] |
2016-10-26
|
[
[
"Neubert",
"M.",
""
]
] |
In a series of three lectures, I review the theory and phenomenology of heavy quark masses and mixing angles and the status of their determination. In addition, I give an introduction to heavy quark symmetry, with the main emphasis on the development of heavy quark effective field theory and its application to obtain a model-independent determination of $|V_{cb}|$.
|
hep-ph/0010215
|
Xiaojun Wang
|
Xiao-Jun Wang and Mu-Lin Yan
|
Chiral Expansion Theory at Vector Meson Scale
|
revtex file, 36 pages, 10 eps figures
| null | null | null |
hep-ph
| null |
We study physics on $\rho(770)$ and $\omega(782)$ in framework of chiral
constituent quark model. The effective action is derived by proper vertex
method, which can capture all order information of chiral expansion. The
$N_c^{-1}$ expansion is also studied systematically. It is shown that the
momentum expansion at vector meson energy scale converges slowly, and the loop
effects of pseudoscalar meson play an important role at this energy scale. We
provide a method to prove the unitarity of S-matrix in any low-energy effective
theory of QCD. Phenomenologically, we study decays for $\rho\to\pi\pi$,
$\rho\to e^+e^-$, $\omega\to\pi^+\pi^-$, $\rho^\pm\to\gamma\pi^\pm$ and
$\omega\to\gamma\pi^0$, $\rho^0-\omega$ mixing and their mass splitting, pion
form factor, $I=l=1$ phase shift and light quark masses at vector meson energy
scale. These results include all order contribution of vector meson momentum
expansion and is up to next to leading order of $N_c^{-1}$ expansion. All of
these theoretical predictions agree with data very well. The unitarity of
S-matrix yielded by this framework is examined. The Breit-Winger formula for
resonance propagator is derived.
|
[
{
"created": "Thu, 19 Oct 2000 02:34:50 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Dec 2000 10:02:14 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Wang",
"Xiao-Jun",
""
],
[
"Yan",
"Mu-Lin",
""
]
] |
We study physics on $\rho(770)$ and $\omega(782)$ in framework of chiral constituent quark model. The effective action is derived by proper vertex method, which can capture all order information of chiral expansion. The $N_c^{-1}$ expansion is also studied systematically. It is shown that the momentum expansion at vector meson energy scale converges slowly, and the loop effects of pseudoscalar meson play an important role at this energy scale. We provide a method to prove the unitarity of S-matrix in any low-energy effective theory of QCD. Phenomenologically, we study decays for $\rho\to\pi\pi$, $\rho\to e^+e^-$, $\omega\to\pi^+\pi^-$, $\rho^\pm\to\gamma\pi^\pm$ and $\omega\to\gamma\pi^0$, $\rho^0-\omega$ mixing and their mass splitting, pion form factor, $I=l=1$ phase shift and light quark masses at vector meson energy scale. These results include all order contribution of vector meson momentum expansion and is up to next to leading order of $N_c^{-1}$ expansion. All of these theoretical predictions agree with data very well. The unitarity of S-matrix yielded by this framework is examined. The Breit-Winger formula for resonance propagator is derived.
|
0706.3297
|
Mikhail Rogal
|
M. Rogal and S. Moch
|
Higher Mellin moments for charged current DIS
|
Contribution to the proceedings of the conference DIS 2007, Munich,
April 2007
|
PoSACAT2007:086,2007
|
10.3360/dis.2007.48
|
DESY 07-086
|
hep-ph
| null |
We report on our recent results for deep-inelastic neutrino-proton
scattering. We have computed the perturbative QCD corrections to three loops
for the harged current structure functions F_2, F_L and F_3 for the combination
nu P - nubar P. In leading twist approximation we have calculated the first six
odd-integer Mellin moments in the case of F_2 and F_L and the first six
even-integer moments in the case of F_3. As a new result we have obtained the
coefficient functions to O(alpha_s^3) and we have found the corresponding
anomalous dimensions to agree with known results in the literature.
|
[
{
"created": "Fri, 22 Jun 2007 10:10:26 GMT",
"version": "v1"
}
] |
2008-12-18
|
[
[
"Rogal",
"M.",
""
],
[
"Moch",
"S.",
""
]
] |
We report on our recent results for deep-inelastic neutrino-proton scattering. We have computed the perturbative QCD corrections to three loops for the harged current structure functions F_2, F_L and F_3 for the combination nu P - nubar P. In leading twist approximation we have calculated the first six odd-integer Mellin moments in the case of F_2 and F_L and the first six even-integer moments in the case of F_3. As a new result we have obtained the coefficient functions to O(alpha_s^3) and we have found the corresponding anomalous dimensions to agree with known results in the literature.
|
1107.0755
|
Kristian McDonald
|
Damien P. George and Kristian L. McDonald
|
Gravity on a Little Warped Space
|
1+24 pages
|
Phys.Rev.D84:064007,2011
|
10.1103/PhysRevD.84.064007
| null |
hep-ph gr-qc hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the consistent inclusion of 4D Einstein gravity on a truncated
slice of AdS_5 whose bulk-gravity and UV scales are much less than the 4D
Planck scale, M_* << M_{Pl}. Such "Little Warped Spaces" have found
phenomenological utility and can be motivated by string realizations of the
Randall-Sundrum framework. Using the interval approach to brane-world gravity,
we show that the inclusion of a large UV-localized Einstein-Hilbert term allows
one to consistently incorporate 4D Einstein gravity into the low-energy theory.
We detail the spectrum of Kaluza-Klein metric fluctuations and, in particular,
examine the coupling of the little radion to matter. Furthermore, we show that
Goldberger-Wise stabilization can be successfully implemented on such spaces.
Our results demonstrate that realistic low-energy effective theories can be
constructed on these spaces, and have relevance for existing models in the
literature.
|
[
{
"created": "Mon, 4 Jul 2011 23:23:17 GMT",
"version": "v1"
}
] |
2011-11-15
|
[
[
"George",
"Damien P.",
""
],
[
"McDonald",
"Kristian L.",
""
]
] |
We investigate the consistent inclusion of 4D Einstein gravity on a truncated slice of AdS_5 whose bulk-gravity and UV scales are much less than the 4D Planck scale, M_* << M_{Pl}. Such "Little Warped Spaces" have found phenomenological utility and can be motivated by string realizations of the Randall-Sundrum framework. Using the interval approach to brane-world gravity, we show that the inclusion of a large UV-localized Einstein-Hilbert term allows one to consistently incorporate 4D Einstein gravity into the low-energy theory. We detail the spectrum of Kaluza-Klein metric fluctuations and, in particular, examine the coupling of the little radion to matter. Furthermore, we show that Goldberger-Wise stabilization can be successfully implemented on such spaces. Our results demonstrate that realistic low-energy effective theories can be constructed on these spaces, and have relevance for existing models in the literature.
|
2212.04046
|
Jonathan Zuk
|
Jonathan Zuk, Csaba Balazs, Andreas Papaefstathiou and Graham White
|
The Effective Potential in Fermi Gauges Beyond the Standard Model
|
12 pages, 2 figures
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We derive the field-dependent masses in Fermi gauges for arbitrary scalar
extensions of the Standard Model. These masses can be used to construct the
effective potential for various models of new physics. We release a flexible
$\texttt{Mathematica}$ notebook ($\texttt{VefFermi}$) which performs these
calculations and renders large-scale phenomenological studies of various models
possible. Motivated by the debate on the importance of gauge dependence, we
show that, even in relatively simple models, there exist points where the
global minimum is discontinuous in the gauge parameter. Such points require
some care in discovering, indicating that a gauge-dependent treatment might
still give reasonable results when examining the global features of a model.
|
[
{
"created": "Thu, 8 Dec 2022 02:55:18 GMT",
"version": "v1"
}
] |
2022-12-09
|
[
[
"Zuk",
"Jonathan",
""
],
[
"Balazs",
"Csaba",
""
],
[
"Papaefstathiou",
"Andreas",
""
],
[
"White",
"Graham",
""
]
] |
We derive the field-dependent masses in Fermi gauges for arbitrary scalar extensions of the Standard Model. These masses can be used to construct the effective potential for various models of new physics. We release a flexible $\texttt{Mathematica}$ notebook ($\texttt{VefFermi}$) which performs these calculations and renders large-scale phenomenological studies of various models possible. Motivated by the debate on the importance of gauge dependence, we show that, even in relatively simple models, there exist points where the global minimum is discontinuous in the gauge parameter. Such points require some care in discovering, indicating that a gauge-dependent treatment might still give reasonable results when examining the global features of a model.
|
0711.0970
|
Alvaro de Rujula
|
A. De Rujula
|
An introduction to Cosmic Rays and Gamma-Ray Bursts, and to their simple
understanding
|
Contribution to La Thuile Workshop 2007. Brief chapter (13) added,
prompted by recent Auger results on UHECR/AGN correlations
| null | null | null |
hep-ph astro-ph
| null |
I review the subjects of non-solar cosmic rays (CRs) and long-duration
gamma-ray bursts (GRBs). Of the various interpretations of these phenomena, the
one best supported by the data is the following. Accreting compact objects,
such as black holes, are seen to emit relativistic puffs of plasma:
`cannonballs' (CBs). The inner domain of a rotating star whose core has
collapsed resembles such an accreting system. This suggests that core-collapse
supernovae (SNe) emit CBs, as SN1987A did. The fate of a CB as it exits a SN
and travels in space can be studied as a function of the CB's mass and energy,
and of `ambient' properties: the encountered matter- and light- distributions,
the composition of the former, and the location of intelligent observers. The
latter may conclude that the interactions of CBs with ambient matter and light
generate CRs and GRBs, all of whose properties can be described by this `CB
model' with few parameters and simple physics. GRB data are still being taken
in unscrutinized domains of energy and timing. They agree accurately with the
model's predictions. CR data are centenary. Their precision will improve, but
new striking predictions are unlikely. Yet, a one-free-parameter description of
all CR data works very well. This is a bit as if one discovered QED today and
only needed to fit $\alpha$.
|
[
{
"created": "Tue, 6 Nov 2007 15:07:25 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Nov 2007 16:43:47 GMT",
"version": "v2"
},
{
"created": "Mon, 12 Nov 2007 17:58:06 GMT",
"version": "v3"
}
] |
2007-11-12
|
[
[
"De Rujula",
"A.",
""
]
] |
I review the subjects of non-solar cosmic rays (CRs) and long-duration gamma-ray bursts (GRBs). Of the various interpretations of these phenomena, the one best supported by the data is the following. Accreting compact objects, such as black holes, are seen to emit relativistic puffs of plasma: `cannonballs' (CBs). The inner domain of a rotating star whose core has collapsed resembles such an accreting system. This suggests that core-collapse supernovae (SNe) emit CBs, as SN1987A did. The fate of a CB as it exits a SN and travels in space can be studied as a function of the CB's mass and energy, and of `ambient' properties: the encountered matter- and light- distributions, the composition of the former, and the location of intelligent observers. The latter may conclude that the interactions of CBs with ambient matter and light generate CRs and GRBs, all of whose properties can be described by this `CB model' with few parameters and simple physics. GRB data are still being taken in unscrutinized domains of energy and timing. They agree accurately with the model's predictions. CR data are centenary. Their precision will improve, but new striking predictions are unlikely. Yet, a one-free-parameter description of all CR data works very well. This is a bit as if one discovered QED today and only needed to fit $\alpha$.
|
hep-ph/9802436
|
Dr Tsou Sheung Tsun
|
J Bordes (Valencia), HM Chan (Rutherford Appleton Lab), J. Pfaudler
(Oxford), and ST Tsou (Oxford)
|
Features of Quark and Lepton Mixing from Differential Geometry of Curves
on Surfaces
|
10 pages, Latex, 3 figures using eps
|
Phys.Rev. D58 (1998) 053006
|
10.1103/PhysRevD.58.053006
|
RAL-TR-98-022
|
hep-ph hep-th
| null |
It is noted that the CKM matrix elements for both quarks and leptons as
conceived in the Dualized Standard Model (DSM) can be interpreted as direction
cosines obtained by moving the Darboux trihedron (a 3-frame) along a trajectory
on a sphere traced out through changing energy scales by a 3-vector factorized
from the mass matrix. From the `Darboux' analogues of the well-known
Serret--Frenet formulae for space curves, it is seen that the corner elements
($V_{ub}, V_{td}$ for quarks, and $U_{e3}, U_{\tau 1}$ for leptons) are
associated with the (geodesic) torsion, while the other off-diagonal elements
($V_{us}, V_{cd}$ and $V_{cb}, V_{ts}$ for quarks, and $U_{e2}, U_{\mu 1}$ and
$U_{\mu 3}, U_{\tau 2}$ for leptons) with the (respectively geodesic and
normal) curvatures of the trajectory. From this it follows that (i) the corner
elements in both matrices are much smaller than the other elements, (ii) the
$U_{\mu 3}, U_{\tau 2}$ elements for the lepton CKM matrix are much larger than
their counterparts in the quark matrix. Both these conclusions are strongly
borne out by experiment, for quarks in hadron decays and for leptons in
neutrino oscillations, and by previous explicit calculations within the DSM
scheme.
|
[
{
"created": "Thu, 26 Feb 1998 15:52:28 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Bordes",
"J",
"",
"Valencia"
],
[
"Chan",
"HM",
"",
"Rutherford Appleton Lab"
],
[
"Pfaudler",
"J.",
"",
"Oxford"
],
[
"Tsou",
"ST",
"",
"Oxford"
]
] |
It is noted that the CKM matrix elements for both quarks and leptons as conceived in the Dualized Standard Model (DSM) can be interpreted as direction cosines obtained by moving the Darboux trihedron (a 3-frame) along a trajectory on a sphere traced out through changing energy scales by a 3-vector factorized from the mass matrix. From the `Darboux' analogues of the well-known Serret--Frenet formulae for space curves, it is seen that the corner elements ($V_{ub}, V_{td}$ for quarks, and $U_{e3}, U_{\tau 1}$ for leptons) are associated with the (geodesic) torsion, while the other off-diagonal elements ($V_{us}, V_{cd}$ and $V_{cb}, V_{ts}$ for quarks, and $U_{e2}, U_{\mu 1}$ and $U_{\mu 3}, U_{\tau 2}$ for leptons) with the (respectively geodesic and normal) curvatures of the trajectory. From this it follows that (i) the corner elements in both matrices are much smaller than the other elements, (ii) the $U_{\mu 3}, U_{\tau 2}$ elements for the lepton CKM matrix are much larger than their counterparts in the quark matrix. Both these conclusions are strongly borne out by experiment, for quarks in hadron decays and for leptons in neutrino oscillations, and by previous explicit calculations within the DSM scheme.
|
1912.07030
|
Feng-Kun Guo
|
Feng-Kun Guo, Xiao-Hai Liu, Shuntaro Sakai
|
Threshold cusps and triangle singularities in hadronic reactions
|
Version accepted for publication in Prog. Part. Nucl. Phys.; 84
pages, 34 figures
|
Prog. Part. Nucl. Phys. 112 (2020) 103757
|
10.1016/j.ppnp.2020.103757
| null |
hep-ph hep-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The spectrum of hadrons is the manifestation of color confinement of quantum
chromodynamics. Hadronic resonances correspond to poles of the S-matrix. Since
2003, lots of new hadron resonant structures were discovered in the mass
regions from light mesons to hadrons containing a pair of a heavy quark and an
antiquark. Many of them are candidates of exotic hadrons, and they are usually
observed as peaks in invariant mass distributions. However, the S-matrix also
has kinematical singularities due to the on-shellness of intermediate particles
for a process, such as two-body thresholds and triangle singularities, and they
can produce peaks as well. On the one hand, such singularities may be
misidentified as resonances; on the other hand, they can be used as tools for
precision measurements. In this paper, we review the threshold cusps and
various triangle singularities in hadronic reactions, paying attention to their
manifestations in phenomena related to exotic hadron candidates.
|
[
{
"created": "Sun, 15 Dec 2019 12:06:29 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Jan 2020 14:25:28 GMT",
"version": "v2"
}
] |
2020-04-08
|
[
[
"Guo",
"Feng-Kun",
""
],
[
"Liu",
"Xiao-Hai",
""
],
[
"Sakai",
"Shuntaro",
""
]
] |
The spectrum of hadrons is the manifestation of color confinement of quantum chromodynamics. Hadronic resonances correspond to poles of the S-matrix. Since 2003, lots of new hadron resonant structures were discovered in the mass regions from light mesons to hadrons containing a pair of a heavy quark and an antiquark. Many of them are candidates of exotic hadrons, and they are usually observed as peaks in invariant mass distributions. However, the S-matrix also has kinematical singularities due to the on-shellness of intermediate particles for a process, such as two-body thresholds and triangle singularities, and they can produce peaks as well. On the one hand, such singularities may be misidentified as resonances; on the other hand, they can be used as tools for precision measurements. In this paper, we review the threshold cusps and various triangle singularities in hadronic reactions, paying attention to their manifestations in phenomena related to exotic hadron candidates.
|
2406.03940
|
C. J. A. P. Martins
|
F. C. N. Q. Pimenta, C. J. A. P. Martins
|
Scaling solutions for current-carrying cosmic string networks
|
15 pages, 5 figures, 3 tables; to appear in Phys. Rev. D
| null | null | null |
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Cosmic string networks are the best motivated relics of cosmological phase
transitions, being unavoidable in many physically plausible extensions of the
Standard Model. Most studies, including those providing constraints from and
forecasts of their observational signals, rely on assumptions of featureless
networks, neglecting the additional degrees of freedom on the string
worldsheet, e.g. charges and currents, which are all but unavoidable in
physically realistic models. An extension of the canonical velocity-dependent
one-scale model, accounting for all such possible degrees of freedom, has been
recently developed. Here we improve its physical interpretation by studying and
classifying its possible asymptotic scaling solutions, and in particular how
they are affected by the expansion of the Universe and the available energy
loss or transfer mechanisms. We find three classes of solutions. For
sufficiently fast expansion rates the charges and currents decay and one
asymptotes to the Nambu-Goto case, while for slower expansion rates they can
dominate the network dynamics. In between the two there is a third regime in
which the network, including its charge and current, reaches full scaling.
Under specific but plausible assumptions, this intermediate regime corresponds
to the matter-dominated era. Our results agree with, and significantly extend,
those of previous studies.
|
[
{
"created": "Thu, 6 Jun 2024 10:28:05 GMT",
"version": "v1"
}
] |
2024-06-07
|
[
[
"Pimenta",
"F. C. N. Q.",
""
],
[
"Martins",
"C. J. A. P.",
""
]
] |
Cosmic string networks are the best motivated relics of cosmological phase transitions, being unavoidable in many physically plausible extensions of the Standard Model. Most studies, including those providing constraints from and forecasts of their observational signals, rely on assumptions of featureless networks, neglecting the additional degrees of freedom on the string worldsheet, e.g. charges and currents, which are all but unavoidable in physically realistic models. An extension of the canonical velocity-dependent one-scale model, accounting for all such possible degrees of freedom, has been recently developed. Here we improve its physical interpretation by studying and classifying its possible asymptotic scaling solutions, and in particular how they are affected by the expansion of the Universe and the available energy loss or transfer mechanisms. We find three classes of solutions. For sufficiently fast expansion rates the charges and currents decay and one asymptotes to the Nambu-Goto case, while for slower expansion rates they can dominate the network dynamics. In between the two there is a third regime in which the network, including its charge and current, reaches full scaling. Under specific but plausible assumptions, this intermediate regime corresponds to the matter-dominated era. Our results agree with, and significantly extend, those of previous studies.
|
1003.4022
|
Robert Feger
|
Robert Feger (1), Verena Klose (2), Heiko Lacker (2), Thomas Lueck (2)
and Thomas Mannel (1) ((1) Univ. Siegen, (2) HU Berlin)
|
Limit on a Right-Handed Admixture to the Weak $b \to c$ Current from
Semileptonic Decays
|
7 pages, 3 figures, 2 tables
|
Phys.Rev.D82:073002,2010
|
10.1103/PhysRevD.82.073002
|
SI-HEP-2009-19
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We determine an upper bound for a possible right-handed $b{\to}c$ quark
current admixture in semileptonic $\bar{B} \to X_{c} \ell^{-} \bar{\nu}$ decays
from a simulateous fit to moments of the lepton-enery and hadronic-mass
distribution measured as a function of the lower limit on the lepton energy,
using data measured by the \babar\ detector. The right-handed admixture is
parametrized by a new parameter $c_R$ as coefficient of computed moments with
right-handed quark current. For the standard model part we use the prediction
of the heavy-quark expansion (HQE) up to order $1/m_b^3$ and perturbative
corrections and for the right-handed contribution only up to order $1/m_b^2$
and perturbative corrections. We find $\cR=0.05\asympm{+0.33}{-0.50}$ in
agreement with the standard-model prediction of zero. Additionally, we give a
contraint on a possible right-handed admixture from exclusive decays, which is
with a value of $\cR =0.01{\pm}0.03$ more restrictive than our value from the
inclusive fit. The difference in \Vcb between the inclusive and exclusive
extraction is only slightly reduced when allowing for a right-handed admixture
in the range of $\cR=0.01 {\pm} 0.03$.
|
[
{
"created": "Sun, 21 Mar 2010 20:23:07 GMT",
"version": "v1"
}
] |
2014-11-20
|
[
[
"Feger",
"Robert",
"",
"Univ. Siegen"
],
[
"Klose",
"Verena",
"",
"HU Berlin"
],
[
"Lacker",
"Heiko",
"",
"HU Berlin"
],
[
"Lueck",
"Thomas",
"",
"HU Berlin"
],
[
"Mannel",
"Thomas",
"",
"Univ. Siegen"
]
] |
We determine an upper bound for a possible right-handed $b{\to}c$ quark current admixture in semileptonic $\bar{B} \to X_{c} \ell^{-} \bar{\nu}$ decays from a simulateous fit to moments of the lepton-enery and hadronic-mass distribution measured as a function of the lower limit on the lepton energy, using data measured by the \babar\ detector. The right-handed admixture is parametrized by a new parameter $c_R$ as coefficient of computed moments with right-handed quark current. For the standard model part we use the prediction of the heavy-quark expansion (HQE) up to order $1/m_b^3$ and perturbative corrections and for the right-handed contribution only up to order $1/m_b^2$ and perturbative corrections. We find $\cR=0.05\asympm{+0.33}{-0.50}$ in agreement with the standard-model prediction of zero. Additionally, we give a contraint on a possible right-handed admixture from exclusive decays, which is with a value of $\cR =0.01{\pm}0.03$ more restrictive than our value from the inclusive fit. The difference in \Vcb between the inclusive and exclusive extraction is only slightly reduced when allowing for a right-handed admixture in the range of $\cR=0.01 {\pm} 0.03$.
|
1812.05523
|
Diego Restrepo
|
Julian Calle, Diego Restrepo, Carlos E. Yaguna, \'Oscar Zapata
|
Minimal radiative Dirac neutrino mass models
|
10 pages, 6 figures. References added. Version accepted in PRD
|
Phys. Rev. D 99, 075008 (2019)
|
10.1103/PhysRevD.99.075008
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
Neutrinos may be Dirac particles whose masses arise radiatively at one-loop,
naturally explaining their small values. In this work we show that all the
one-loop realizations of the dimension-five operator to effectively generate
Dirac neutrino masses can be implemented by using a single local symmetry:
$U(1)_{B-L}$. Since this symmetry is anomalous, new chiral fermions, charged
under $B-L$, are required. The minimal model consistent with neutrino data
includes three chiral fermions, two of them with the same lepton number. The
next minimal models contain five chiral fermions and their $B-L$ charges can be
fixed by requiring a dark matter candidate in the spectrum. We list the full
particle content as well as the relevant Lagrangian terms for each of these
models. They are new and simple models that can simultaneously accommodate
Dirac neutrino masses (at one-loop) and dark matter without invoking any
discrete symmetries.
|
[
{
"created": "Thu, 13 Dec 2018 17:05:50 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Dec 2018 17:31:46 GMT",
"version": "v2"
},
{
"created": "Wed, 15 May 2019 19:35:52 GMT",
"version": "v3"
}
] |
2019-05-17
|
[
[
"Calle",
"Julian",
""
],
[
"Restrepo",
"Diego",
""
],
[
"Yaguna",
"Carlos E.",
""
],
[
"Zapata",
"Óscar",
""
]
] |
Neutrinos may be Dirac particles whose masses arise radiatively at one-loop, naturally explaining their small values. In this work we show that all the one-loop realizations of the dimension-five operator to effectively generate Dirac neutrino masses can be implemented by using a single local symmetry: $U(1)_{B-L}$. Since this symmetry is anomalous, new chiral fermions, charged under $B-L$, are required. The minimal model consistent with neutrino data includes three chiral fermions, two of them with the same lepton number. The next minimal models contain five chiral fermions and their $B-L$ charges can be fixed by requiring a dark matter candidate in the spectrum. We list the full particle content as well as the relevant Lagrangian terms for each of these models. They are new and simple models that can simultaneously accommodate Dirac neutrino masses (at one-loop) and dark matter without invoking any discrete symmetries.
|
1701.01136
|
Christopher W. Murphy
|
Hooman Davoudiasl, Christopher W. Murphy
|
Fuzzy Dark Matter from Infrared Confining Dynamics
|
v2: 5 pages, 1 figure; references added, wording improved, matches
PRL version
|
Phys. Rev. Lett. 118, 141801 (2017)
|
10.1103/PhysRevLett.118.141801
| null |
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A very light boson of mass $\mathcal{O}(10^{-22})$ eV may potentially be a
viable dark matter (DM) candidate which can avoid phenomenological problems
associated with cold DM. Such "fuzzy DM (FDM)" may naturally be an axion with a
decay constant $f_a \sim 10^{16} \div 10^{18}$ GeV, and a mass $m_a \sim
\mu^2/f_a$ with $\mu\sim 10^2$ eV. Here we propose a concrete model where $\mu$
arises as a dynamical scale from infrared confining dynamics, analogous to QCD.
Our model is an alternative to the usual approach of generating $\mu$ through
string theoretic instanton effects. We outline the features of this scenario
that result from various cosmological constraints. We find that those
constraints are suggestive of a period of mild of inflation, perhaps from a
strong first order phase transition, that reheats the Standard Model (SM)
sector only. A typical prediction of our scenario, broadly speaking, is a
larger effective number of neutrinos compared to the SM value $N_{\text{eff}}
\approx 3$, as inferred from precision measurements of the cosmic microwave
background. Some of the new degrees of freedom may be identified as "sterile
neutrinos," which may be required to explain certain neutrino oscillation
anomalies. Hence, aspects of our scenario could be testable in terrestrial
experiments, which is a novelty of our FDM model.
|
[
{
"created": "Wed, 4 Jan 2017 19:49:31 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Apr 2017 19:24:07 GMT",
"version": "v2"
}
] |
2017-04-12
|
[
[
"Davoudiasl",
"Hooman",
""
],
[
"Murphy",
"Christopher W.",
""
]
] |
A very light boson of mass $\mathcal{O}(10^{-22})$ eV may potentially be a viable dark matter (DM) candidate which can avoid phenomenological problems associated with cold DM. Such "fuzzy DM (FDM)" may naturally be an axion with a decay constant $f_a \sim 10^{16} \div 10^{18}$ GeV, and a mass $m_a \sim \mu^2/f_a$ with $\mu\sim 10^2$ eV. Here we propose a concrete model where $\mu$ arises as a dynamical scale from infrared confining dynamics, analogous to QCD. Our model is an alternative to the usual approach of generating $\mu$ through string theoretic instanton effects. We outline the features of this scenario that result from various cosmological constraints. We find that those constraints are suggestive of a period of mild of inflation, perhaps from a strong first order phase transition, that reheats the Standard Model (SM) sector only. A typical prediction of our scenario, broadly speaking, is a larger effective number of neutrinos compared to the SM value $N_{\text{eff}} \approx 3$, as inferred from precision measurements of the cosmic microwave background. Some of the new degrees of freedom may be identified as "sterile neutrinos," which may be required to explain certain neutrino oscillation anomalies. Hence, aspects of our scenario could be testable in terrestrial experiments, which is a novelty of our FDM model.
|
hep-ph/0011102
|
Vladimir F. Kovalev
|
B. Geyer, V. F. Kovalev
|
Inflationary Brans-Dicke Quantum Universe II: Particular evolutions and
stability analysis
|
24 pages, 9 figures; corrected typos in author's name
| null | null | null |
hep-ph gr-qc hep-th
| null |
We made an analysis of the equations of motion which are obtained from the
one - loop effective action for Brans-Dicke gravity with N dilaton - coupled
massless fermions in a time-dependent conformally flat background. Various
particular solutions, including the well-known stationary one, of the
corresponding set of first-order differential equations are given. Some of
these solutions describe an expanding time-dependent Universe with increasing,
constant or also decreasing dilaton. This is illustrated by a numerical
analysis. For the nonstationary solutions a stability analysis is given.
|
[
{
"created": "Wed, 8 Nov 2000 05:27:43 GMT",
"version": "v1"
},
{
"created": "Fri, 10 Nov 2000 06:58:32 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Geyer",
"B.",
""
],
[
"Kovalev",
"V. F.",
""
]
] |
We made an analysis of the equations of motion which are obtained from the one - loop effective action for Brans-Dicke gravity with N dilaton - coupled massless fermions in a time-dependent conformally flat background. Various particular solutions, including the well-known stationary one, of the corresponding set of first-order differential equations are given. Some of these solutions describe an expanding time-dependent Universe with increasing, constant or also decreasing dilaton. This is illustrated by a numerical analysis. For the nonstationary solutions a stability analysis is given.
|
hep-ph/0511347
|
Giulia Zanderighi
|
G. Zanderighi
|
Unstable particle production near threshold with effective theory
methods
|
Invited talk at 2005 International Linear Collider Physics and
Detector Workshop and Second ILC Accelerator Workshop, Snowmass, CO
(Snowmass05), 3 pages
|
ECONFC0508141:ALCPG0403,2005
| null |
ALCPG0403, FERMILAB-CONF-05-527-T, CERN-PH-TH/2005-238
|
hep-ph
| null |
We illustrate the use of effective theory methods to describe resonant
unstable particles. We outline the necessary ingredients to describe $W$-pair
production close to threshold in $e^-e^+$ collisions.
|
[
{
"created": "Wed, 30 Nov 2005 17:44:31 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Zanderighi",
"G.",
""
]
] |
We illustrate the use of effective theory methods to describe resonant unstable particles. We outline the necessary ingredients to describe $W$-pair production close to threshold in $e^-e^+$ collisions.
|
hep-ph/9210235
| null |
Paul Langacker and Nir Polonsky
|
Uncertainties in Coupling Constant Unification
|
LaTex, 51 pages, 6 figures (available upon request), UPR-0513T
|
Phys.Rev. D47 (1993) 4028-4045
|
10.1103/PhysRevD.47.4028
| null |
hep-ph
| null |
The status of coupling constant unification in the standard model and its
supersymmetric extension are discussed. Uncertainties associated with the input
coupling constants, $m_{t}$, threshold corrections at the low and high scales,
and possible nonrenormalizable operators are parametrized and estimated. A
simple parametrization of a general supersymmetric new particle spectrum is
given. It is shown that an effective scale $M_{SUSY}$ can be defined, but for a
realistic spectrum it may differ considerably from the typical new particle
masses. The implications of the lower (higher) values of $\alpha_{s}(M_{Z})$
suggested by low-energy ($Z$-pole) experiments are discussed.
|
[
{
"created": "Wed, 14 Oct 1992 18:58:00 GMT",
"version": "v1"
}
] |
2009-10-22
|
[
[
"Langacker",
"Paul",
""
],
[
"Polonsky",
"Nir",
""
]
] |
The status of coupling constant unification in the standard model and its supersymmetric extension are discussed. Uncertainties associated with the input coupling constants, $m_{t}$, threshold corrections at the low and high scales, and possible nonrenormalizable operators are parametrized and estimated. A simple parametrization of a general supersymmetric new particle spectrum is given. It is shown that an effective scale $M_{SUSY}$ can be defined, but for a realistic spectrum it may differ considerably from the typical new particle masses. The implications of the lower (higher) values of $\alpha_{s}(M_{Z})$ suggested by low-energy ($Z$-pole) experiments are discussed.
|
hep-ph/0408121
|
Bo-Qiang Ma
|
Bin Wu, Bo-Qiang Ma
|
The 35-plet Baryons from Chiral Soliton Models
|
10 LaTex pages, 1 figure, to appear in PRD
|
Phys.Rev. D70 (2004) 094042
|
10.1103/PhysRevD.70.094042
| null |
hep-ph hep-ex nucl-ex nucl-th
| null |
We investigate the 35-plet baryons from the chiral soliton models. We find
that the coupling constant for the decay of 35-plet baryons with spin 3/2 to
the decuplet baryons is surprisingly small, but that for the decay to 27-plet
baryons with spin 3/2 is larger. We give all the masses and widths of 35-plet
baryons with spin 5/2 and suggest candidates for all nonexotic members from the
available particle listings. We also focus on $\Delta_{5/2}$ and $\Theta_2$,
which are the lightest two baryons of 35-plet with spin 5/2 and with simplest
minimal pentaquark configurations. Calculations show that
$\Gamma_{\Delta_{5/2}}<$380 MeV, compared with the results from SU(2) Skyrme
Model ($\Gamma_{\Delta_{5/2}}>$800 MeV), and $\Gamma_{\Theta_{2}}<100$ MeV if
we assume that their widths are dominated by two-body decay and that $\Theta^+$
has a width $\Gamma_{\Theta^+}<25$ MeV.
|
[
{
"created": "Mon, 9 Aug 2004 23:20:17 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Aug 2004 15:01:36 GMT",
"version": "v2"
}
] |
2009-11-10
|
[
[
"Wu",
"Bin",
""
],
[
"Ma",
"Bo-Qiang",
""
]
] |
We investigate the 35-plet baryons from the chiral soliton models. We find that the coupling constant for the decay of 35-plet baryons with spin 3/2 to the decuplet baryons is surprisingly small, but that for the decay to 27-plet baryons with spin 3/2 is larger. We give all the masses and widths of 35-plet baryons with spin 5/2 and suggest candidates for all nonexotic members from the available particle listings. We also focus on $\Delta_{5/2}$ and $\Theta_2$, which are the lightest two baryons of 35-plet with spin 5/2 and with simplest minimal pentaquark configurations. Calculations show that $\Gamma_{\Delta_{5/2}}<$380 MeV, compared with the results from SU(2) Skyrme Model ($\Gamma_{\Delta_{5/2}}>$800 MeV), and $\Gamma_{\Theta_{2}}<100$ MeV if we assume that their widths are dominated by two-body decay and that $\Theta^+$ has a width $\Gamma_{\Theta^+}<25$ MeV.
|
2107.05590
|
Manjunath Omana Kuttan
|
Manjunath Omana Kuttan, Kai Zhou, Jan Steinheimer, Andreas Redelbach
and Horst Stoecker
|
An equation-of-state-meter for CBM using PointNet
|
12 pages, 7 figures. Matches published version
|
J. High Energ. Phys. 2021, 184 (2021)
|
10.1007/JHEP10(2021)184
| null |
hep-ph nucl-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A novel method for identifying the nature of QCD transitions in heavy-ion
collision experiments is introduced. PointNet based Deep Learning (DL) models
are developed to classify the equation of state (EoS) that drives the
hydrodynamic evolution of the system created in Au-Au collisions at 10 AGeV.
The DL models were trained and evaluated in different hypothetical experimental
situations. A decreased performance is observed when more realistic
experimental effects (acceptance cuts and decreased resolutions) are taken into
account. It is shown that the performance can be improved by combining multiple
events to make predictions. The PointNet based models trained on the
reconstructed tracks of charged particles from the CBM detector simulation
discriminate a crossover transition from a first order phase transition with an
accuracy of up to 99.8%. The models were subjected to several tests to evaluate
the dependence of its performance on the centrality of the collisions and
physical parameters of fluid dynamic simulations. The models are shown to work
in a broad range of centralities (b=0-7 fm). However, the performance is found
to improve for central collisions (b=0-3 fm). There is a drop in the
performance when the model parameters lead to reduced duration of the fluid
dynamic evolution or when less fraction of the medium undergoes the transition.
These effects are due to the limitations of the underlying physics and the DL
models are shown to be superior in its discrimination performance in comparison
to conventional mean observables.
|
[
{
"created": "Mon, 12 Jul 2021 17:11:53 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Oct 2021 11:26:31 GMT",
"version": "v2"
}
] |
2021-10-26
|
[
[
"Kuttan",
"Manjunath Omana",
""
],
[
"Zhou",
"Kai",
""
],
[
"Steinheimer",
"Jan",
""
],
[
"Redelbach",
"Andreas",
""
],
[
"Stoecker",
"Horst",
""
]
] |
A novel method for identifying the nature of QCD transitions in heavy-ion collision experiments is introduced. PointNet based Deep Learning (DL) models are developed to classify the equation of state (EoS) that drives the hydrodynamic evolution of the system created in Au-Au collisions at 10 AGeV. The DL models were trained and evaluated in different hypothetical experimental situations. A decreased performance is observed when more realistic experimental effects (acceptance cuts and decreased resolutions) are taken into account. It is shown that the performance can be improved by combining multiple events to make predictions. The PointNet based models trained on the reconstructed tracks of charged particles from the CBM detector simulation discriminate a crossover transition from a first order phase transition with an accuracy of up to 99.8%. The models were subjected to several tests to evaluate the dependence of its performance on the centrality of the collisions and physical parameters of fluid dynamic simulations. The models are shown to work in a broad range of centralities (b=0-7 fm). However, the performance is found to improve for central collisions (b=0-3 fm). There is a drop in the performance when the model parameters lead to reduced duration of the fluid dynamic evolution or when less fraction of the medium undergoes the transition. These effects are due to the limitations of the underlying physics and the DL models are shown to be superior in its discrimination performance in comparison to conventional mean observables.
|
1612.07057
|
Alexander Millar
|
Alexander J. Millar, Georg G. Raffelt, Javier Redondo, Frank D.
Steffen
|
Dielectric Haloscopes to Search for Axion Dark Matter: Theoretical
Foundations
|
71 pages, 34 figures; v2: minor changes, typo in (4.13) corrected,
matches published version
|
JCAP 1701:061,2017
|
10.1088/1475-7516/2017/01/061
| null |
hep-ph astro-ph.CO astro-ph.HE hep-ex physics.ins-det
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the underlying theory of dielectric haloscopes, a new way to detect
dark matter axions. When an interface between different dielectric media is
inside a magnetic field, the oscillating axion field acts as a source of
electromagnetic waves, which emerge in both directions perpendicular to the
surface. The emission rate can be boosted by multiple layers judiciously placed
to achieve constructive interference and by a large transverse area. Starting
from the axion-modified Maxwell equations, we calculate the efficiency of this
new dielectric haloscope approach. This technique could potentially search the
unexplored high-frequency range of 10--100 GHz (axion mass 40--400 $\mu$eV),
where traditional cavity resonators have difficulties reaching the required
volume.
|
[
{
"created": "Wed, 21 Dec 2016 11:15:57 GMT",
"version": "v1"
},
{
"created": "Tue, 31 Jan 2017 17:36:42 GMT",
"version": "v2"
}
] |
2017-02-01
|
[
[
"Millar",
"Alexander J.",
""
],
[
"Raffelt",
"Georg G.",
""
],
[
"Redondo",
"Javier",
""
],
[
"Steffen",
"Frank D.",
""
]
] |
We study the underlying theory of dielectric haloscopes, a new way to detect dark matter axions. When an interface between different dielectric media is inside a magnetic field, the oscillating axion field acts as a source of electromagnetic waves, which emerge in both directions perpendicular to the surface. The emission rate can be boosted by multiple layers judiciously placed to achieve constructive interference and by a large transverse area. Starting from the axion-modified Maxwell equations, we calculate the efficiency of this new dielectric haloscope approach. This technique could potentially search the unexplored high-frequency range of 10--100 GHz (axion mass 40--400 $\mu$eV), where traditional cavity resonators have difficulties reaching the required volume.
|
1802.07249
|
Jai More Dr.
|
Jai More, Asmita Mukherjee and Sreeraj Nair
|
Three Dimensional Imaging of the Nucleon
|
7 pages, 2 figures, Prepared for Proceedings of Light Cone 2017,
18-22 Sept, University of Mumbai, India. To appear in FBS
| null |
10.1007/s00601-018-1348-0
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the Wigner distributions of quarks and gluons in light-front dressed
quark model using the overlap of light front wave functions (LFWFs). We take
the target to be a dressed quark, this is a composite spin $-1/2$ state of
quark dressed with a gluon. This state allows us to calculate the quark and
gluon Wigner distributions analytically in terms of LFWFs using Hamiltonian
perturbation theory. We analyze numerically the Wigner distributions of quark
and gluon and report their nature in the contour plots. We use an improved
numerical technique to remove the cutoff dependence of the Fourier transformed
integral over ${\bf \Delta}_\perp$.
|
[
{
"created": "Tue, 20 Feb 2018 18:51:53 GMT",
"version": "v1"
}
] |
2018-04-04
|
[
[
"More",
"Jai",
""
],
[
"Mukherjee",
"Asmita",
""
],
[
"Nair",
"Sreeraj",
""
]
] |
We study the Wigner distributions of quarks and gluons in light-front dressed quark model using the overlap of light front wave functions (LFWFs). We take the target to be a dressed quark, this is a composite spin $-1/2$ state of quark dressed with a gluon. This state allows us to calculate the quark and gluon Wigner distributions analytically in terms of LFWFs using Hamiltonian perturbation theory. We analyze numerically the Wigner distributions of quark and gluon and report their nature in the contour plots. We use an improved numerical technique to remove the cutoff dependence of the Fourier transformed integral over ${\bf \Delta}_\perp$.
|
1604.07327
|
Robert Appleby
|
R.B. Appleby, R.J. Barlow, J.G Molson, M. Serluca, A. Toader
|
The Practical Pomeron for High Energy Proton Collimation
|
23 pages, 25 figures
| null |
10.1140/epjc/s10052-016-4363-7
| null |
hep-ph physics.acc-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a model which describes proton scattering data from ISR to
Tevatron energies, and which can be applied to collimation n high energy
accelerators, such as the LHC and FCC. Collimators remove beam halo particles,
so that they do not impinge on vulnerable regions of the machine, such as the
superconducting magnets and the experimental areas. In simulating the effect of
the collimator jaws it is crucial to model the scattering of protons at small
momentum transfer~$t$,as these protons can subsequently survive several turns
of the ring before being lost. At high energies these soft processes are well
described by Pomeron exchange models. We study the behaviour of elastic and
single-diffractive dissociation cross sections over a wide range of energy, and
show that the model can be used as a global description of the wide variety of
high energy elastic and diffractive data presently available. In particular it
models low mass diffraction dissociation, where a rich resonance structure is
present, and thus predicts the differential and integrated cross sections in
the kinematical range appropriate to the LHC.We incorporate the physics of this
model into the beam tracking code MERLIN and use it to simulate the resulting
loss maps of the beam halo lost in the collimators in the LHC.
|
[
{
"created": "Mon, 25 Apr 2016 16:57:25 GMT",
"version": "v1"
}
] |
2016-10-12
|
[
[
"Appleby",
"R. B.",
""
],
[
"Barlow",
"R. J.",
""
],
[
"Molson",
"J. G",
""
],
[
"Serluca",
"M.",
""
],
[
"Toader",
"A.",
""
]
] |
We present a model which describes proton scattering data from ISR to Tevatron energies, and which can be applied to collimation n high energy accelerators, such as the LHC and FCC. Collimators remove beam halo particles, so that they do not impinge on vulnerable regions of the machine, such as the superconducting magnets and the experimental areas. In simulating the effect of the collimator jaws it is crucial to model the scattering of protons at small momentum transfer~$t$,as these protons can subsequently survive several turns of the ring before being lost. At high energies these soft processes are well described by Pomeron exchange models. We study the behaviour of elastic and single-diffractive dissociation cross sections over a wide range of energy, and show that the model can be used as a global description of the wide variety of high energy elastic and diffractive data presently available. In particular it models low mass diffraction dissociation, where a rich resonance structure is present, and thus predicts the differential and integrated cross sections in the kinematical range appropriate to the LHC.We incorporate the physics of this model into the beam tracking code MERLIN and use it to simulate the resulting loss maps of the beam halo lost in the collimators in the LHC.
|
1702.08417
|
Alfonso Ballon Bayona
|
Alfonso Ballon-Bayona, Gastao Krein, Carlisson Miller
|
Strong couplings and form factors of charmed mesons in holographic QCD
|
18 pages, 8 figures. V3: Added 3 new references. Version published in
Phys. Rev. D
|
Phys. Rev. D 96, 014017 (2017)
|
10.1103/PhysRevD.96.014017
| null |
hep-ph hep-lat hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We extend the two-flavor hard-wall holographic model of Erlich, Katz, Son and
Stephanov [Phys.\ Rev.\ Lett.\ {\bf 95}, 261602 (2005)] to four flavors to
incorporate strange and charm quarks. The model incorporates chiral and flavor
symmetry breaking and provides a reasonable description of masses and weak
decay constants of a variety of scalar, pseudoscalar, vector and axial-vector
strange and charmed mesons. In particular, we examine flavor symmetry breaking
in the strong couplings of the $\rho$ meson to the charmed $D$ and $D^{*}$
mesons. We also compute electromagnetic form factors of the $\pi$, $\rho$, $K$,
$K^*$, $D$ and $D^*$ mesons. We compare our results for the $D$ and $D^*$
mesons with lattice QCD data and other nonperturbative approaches.
|
[
{
"created": "Mon, 27 Feb 2017 18:25:45 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Apr 2017 18:36:22 GMT",
"version": "v2"
},
{
"created": "Thu, 31 Aug 2017 17:51:46 GMT",
"version": "v3"
}
] |
2017-09-01
|
[
[
"Ballon-Bayona",
"Alfonso",
""
],
[
"Krein",
"Gastao",
""
],
[
"Miller",
"Carlisson",
""
]
] |
We extend the two-flavor hard-wall holographic model of Erlich, Katz, Son and Stephanov [Phys.\ Rev.\ Lett.\ {\bf 95}, 261602 (2005)] to four flavors to incorporate strange and charm quarks. The model incorporates chiral and flavor symmetry breaking and provides a reasonable description of masses and weak decay constants of a variety of scalar, pseudoscalar, vector and axial-vector strange and charmed mesons. In particular, we examine flavor symmetry breaking in the strong couplings of the $\rho$ meson to the charmed $D$ and $D^{*}$ mesons. We also compute electromagnetic form factors of the $\pi$, $\rho$, $K$, $K^*$, $D$ and $D^*$ mesons. We compare our results for the $D$ and $D^*$ mesons with lattice QCD data and other nonperturbative approaches.
|
1507.00669
|
Denise Vicino Mrs
|
Ferruccio Feruglio, Ketan M. Patel, Denise Vicino
|
A realistic pattern of fermion masses from a five-dimensional SO(10)
model
|
30 pages, 7 figures, 4 tables
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We provide a unified description of fermion masses and mixing angles in the
framework of a supersymmetric grand unified SO(10) model with anarchic Yukawa
couplings of order unity. The space-time is five dimensional and the extra flat
spatial dimension is compactified on the orbifold $S^1/(Z_2 \times Z_2')$,
leading to Pati-Salam gauge symmetry on the boundary where Yukawa interactions
are localised. The gauge symmetry breaking is completed by means of a rather
economic scalar sector, avoiding the doublet-triplet splitting problem. The
matter fields live in the bulk and their massless modes get exponential
profiles, which naturally explain the mass hierarchy of the different fermion
generations. Quarks and leptons properties are naturally reproduced by a
mechanism, first proposed by Kitano and Li, that lifts the SO(10) degeneracy of
bulk masses in terms of a single parameter. The model provides a realistic
pattern of fermion masses and mixing angles for large values of $\tan\beta$. It
favours normally ordered neutrino mass spectrum with the lightest neutrino mass
below 0.01 eV and no preference for leptonic CP violating phases. The right
handed neutrino mass spectrum is very hierarchical and does not allow for
thermal leptogenesis. We analyse several variants of the basic framework and
find that the results concerning the fermion spectrum are remarkably stable.
|
[
{
"created": "Thu, 2 Jul 2015 17:28:11 GMT",
"version": "v1"
}
] |
2015-07-03
|
[
[
"Feruglio",
"Ferruccio",
""
],
[
"Patel",
"Ketan M.",
""
],
[
"Vicino",
"Denise",
""
]
] |
We provide a unified description of fermion masses and mixing angles in the framework of a supersymmetric grand unified SO(10) model with anarchic Yukawa couplings of order unity. The space-time is five dimensional and the extra flat spatial dimension is compactified on the orbifold $S^1/(Z_2 \times Z_2')$, leading to Pati-Salam gauge symmetry on the boundary where Yukawa interactions are localised. The gauge symmetry breaking is completed by means of a rather economic scalar sector, avoiding the doublet-triplet splitting problem. The matter fields live in the bulk and their massless modes get exponential profiles, which naturally explain the mass hierarchy of the different fermion generations. Quarks and leptons properties are naturally reproduced by a mechanism, first proposed by Kitano and Li, that lifts the SO(10) degeneracy of bulk masses in terms of a single parameter. The model provides a realistic pattern of fermion masses and mixing angles for large values of $\tan\beta$. It favours normally ordered neutrino mass spectrum with the lightest neutrino mass below 0.01 eV and no preference for leptonic CP violating phases. The right handed neutrino mass spectrum is very hierarchical and does not allow for thermal leptogenesis. We analyse several variants of the basic framework and find that the results concerning the fermion spectrum are remarkably stable.
|
1503.06827
|
Hai-Yang Cheng
|
Hai-Yang Cheng, Chun-Khiang Chua, Keh-Fei Liu
|
Revisiting Scalar Glueballs
|
21 pages, comments on the f0(1370) meson were made, uncertainties in
the glueball-quarkonium mixing matrix elements included, discussions on the
\eta\eta modes and many new references added. Version to appear in PRD
|
Phys. Rev. D 92, 094006 (2015)
|
10.1103/PhysRevD.92.094006
| null |
hep-ph hep-ex hep-lat nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
It is commonly believed that the lowest-lying scalar glueball lies somewhere
in the isosinglet scalar mesons $f_0(1370), f_0(1500)$ and $f_0(1710)$ denoted
generically by $f_{0}$. In this work we consider lattice calculations and
experimental data to infer the glue and $q\bar q$ components of $f_0$. These
include the calculations of the scalar glueball masses in quenched and
unquenched lattice QCD, measurements of the radiative decays $J/\psi\to\gamma
f_{0}$, the ratio of $f_{0}$ decays to $\pi\pi$ and $K\bar K$, the ratio of
$J/\psi$ decays to $f_0(1710)\omega$ and $f_0(1710)\phi$, the $f_0$
contributions to $B_s\to J/\psi\pi^+\pi^-$, and the near mass degeneracy of
$a_0(1450)$ and $K_0^*(1430)$. All analyses suggest the prominent glueball
nature of $f_0(1710)$ and the flavor octet structure of $f_0(1500)$.
|
[
{
"created": "Mon, 23 Mar 2015 20:45:32 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Mar 2015 08:17:48 GMT",
"version": "v2"
},
{
"created": "Sat, 10 Oct 2015 03:07:47 GMT",
"version": "v3"
}
] |
2015-11-11
|
[
[
"Cheng",
"Hai-Yang",
""
],
[
"Chua",
"Chun-Khiang",
""
],
[
"Liu",
"Keh-Fei",
""
]
] |
It is commonly believed that the lowest-lying scalar glueball lies somewhere in the isosinglet scalar mesons $f_0(1370), f_0(1500)$ and $f_0(1710)$ denoted generically by $f_{0}$. In this work we consider lattice calculations and experimental data to infer the glue and $q\bar q$ components of $f_0$. These include the calculations of the scalar glueball masses in quenched and unquenched lattice QCD, measurements of the radiative decays $J/\psi\to\gamma f_{0}$, the ratio of $f_{0}$ decays to $\pi\pi$ and $K\bar K$, the ratio of $J/\psi$ decays to $f_0(1710)\omega$ and $f_0(1710)\phi$, the $f_0$ contributions to $B_s\to J/\psi\pi^+\pi^-$, and the near mass degeneracy of $a_0(1450)$ and $K_0^*(1430)$. All analyses suggest the prominent glueball nature of $f_0(1710)$ and the flavor octet structure of $f_0(1500)$.
|
hep-ph/0609104
|
Maurizio Piai
|
Maurizio Piai
|
Walking in the third millennium
|
4 pages
| null | null | null |
hep-ph
| null |
Based on recent progress in the study of strong dynamics in conformal field
theories, I construct a simple, one family model of dynamical electro-weak
symmetry breaking. Non-perturbative effects can be computed systematically. The
model does not suffer from the well known, parametrically big, phenomenological
difficulties of traditional technicolor models, is compatible with all present
experimental data and is testable at the LHC.
|
[
{
"created": "Mon, 11 Sep 2006 19:46:02 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Piai",
"Maurizio",
""
]
] |
Based on recent progress in the study of strong dynamics in conformal field theories, I construct a simple, one family model of dynamical electro-weak symmetry breaking. Non-perturbative effects can be computed systematically. The model does not suffer from the well known, parametrically big, phenomenological difficulties of traditional technicolor models, is compatible with all present experimental data and is testable at the LHC.
|
hep-ph/9603418
|
Dandi Wu
|
Dan-di Wu and Yue-liang Wu
|
CP symmetry and fermion masses in O(10) grand unification models
|
17 pages, Latex file
|
Mod.Phys.Lett. A11 (1996) 2703-2714
|
10.1142/S0217732396002708
|
Prairie View A&M, HEP-12-95
|
hep-ph
| null |
O(10) grand unification models which do not necessarily have an extra global
symmetry are discussed, taking the model with one 10-plet in the Yukawa sector
as an example. A strong correlation between mass ratios and CP is found. The
mass relation $m_t/m_b=v_u/v_d$ is recovered when $G_W=0$; and another special
relation $m_t/m_b=G_E/G_W$ appears when $v_d=0$, where $G_{E,W}$ are Yukawa
coupling constants and $v_{u,d}$ are VEVs. To facilitate this discussion, a set
of $O(10)$ $\gamma$- matrices is offered based on a physical representation of
the spinors and that of the vector of the $SO(10)$ group. Flavor changing
neutral currents in such models are also discussed.
|
[
{
"created": "Tue, 26 Mar 1996 20:00:06 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Apr 1996 16:37:22 GMT",
"version": "v2"
},
{
"created": "Mon, 23 Sep 1996 18:16:23 GMT",
"version": "v3"
}
] |
2009-10-28
|
[
[
"Wu",
"Dan-di",
""
],
[
"Wu",
"Yue-liang",
""
]
] |
O(10) grand unification models which do not necessarily have an extra global symmetry are discussed, taking the model with one 10-plet in the Yukawa sector as an example. A strong correlation between mass ratios and CP is found. The mass relation $m_t/m_b=v_u/v_d$ is recovered when $G_W=0$; and another special relation $m_t/m_b=G_E/G_W$ appears when $v_d=0$, where $G_{E,W}$ are Yukawa coupling constants and $v_{u,d}$ are VEVs. To facilitate this discussion, a set of $O(10)$ $\gamma$- matrices is offered based on a physical representation of the spinors and that of the vector of the $SO(10)$ group. Flavor changing neutral currents in such models are also discussed.
|
2307.10367
|
Benjamin Fuks
|
Chiara Arina, Benjamin Fuks, Jan Heisig, Michael Kr\"amer, Luca
Mantani and Luca Panizzi
|
Comprehensive exploration of t-channel simplified models of dark matter
|
20 pages, 6 figures; version accepted by PRD
|
Phys. Rev. D 108 (2023) 115007
|
10.1103/PhysRevD.108.115007
|
TTK-23-19
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We analyse six classes of t-channel dark matter simplified models in which
the Standard Model field content is extended by a coloured mediator and a dark
matter state. The two new states are enforced to be odd under a new parity,
while all Standard Model fields are taken even so that dark matter stability is
guaranteed. We study several possibilities for the spin of the new particles
and the self-conjugate property of the dark matter, and we focus on model
configurations in which the dark matter couples to the right-handed up quark
for simplicity. We investigate how the parameter spaces of the six models can
be constrained by current and future cosmological, astrophysical and collider
searches, and we highlight the strong complementary between those probes. Our
results demonstrate that scenarios featuring a complex (non self-conjugate)
dark matter field are excluded by cosmology and astrophysics alone, the only
possibility to avoid these bounds being to invoke very weak couplings and
mechanisms such as conversion-driven freeze-out. For models with self-conjugate
dark matter, mediator and dark matter masses are pushed deep into the TeV
regime, with the lower limits on the mediator mass reaching 3 to 4 TeV and
those on the dark matter mass 1 to 2 TeV. In large parts of the parameter space
these strong bounds are driven by same-sign mediator pair production, a channel
so far not considered in the experimental analyses embedding t-channel dark
matter model interpretations.
|
[
{
"created": "Wed, 19 Jul 2023 18:00:02 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Nov 2023 08:18:57 GMT",
"version": "v2"
}
] |
2023-12-11
|
[
[
"Arina",
"Chiara",
""
],
[
"Fuks",
"Benjamin",
""
],
[
"Heisig",
"Jan",
""
],
[
"Krämer",
"Michael",
""
],
[
"Mantani",
"Luca",
""
],
[
"Panizzi",
"Luca",
""
]
] |
We analyse six classes of t-channel dark matter simplified models in which the Standard Model field content is extended by a coloured mediator and a dark matter state. The two new states are enforced to be odd under a new parity, while all Standard Model fields are taken even so that dark matter stability is guaranteed. We study several possibilities for the spin of the new particles and the self-conjugate property of the dark matter, and we focus on model configurations in which the dark matter couples to the right-handed up quark for simplicity. We investigate how the parameter spaces of the six models can be constrained by current and future cosmological, astrophysical and collider searches, and we highlight the strong complementary between those probes. Our results demonstrate that scenarios featuring a complex (non self-conjugate) dark matter field are excluded by cosmology and astrophysics alone, the only possibility to avoid these bounds being to invoke very weak couplings and mechanisms such as conversion-driven freeze-out. For models with self-conjugate dark matter, mediator and dark matter masses are pushed deep into the TeV regime, with the lower limits on the mediator mass reaching 3 to 4 TeV and those on the dark matter mass 1 to 2 TeV. In large parts of the parameter space these strong bounds are driven by same-sign mediator pair production, a channel so far not considered in the experimental analyses embedding t-channel dark matter model interpretations.
|
2212.11825
|
Edward Shuryak
|
Edward Shuryak
|
Mesonic "screening masses" in high temperature QCD
| null | null | null | null |
hep-ph hep-lat
|
http://creativecommons.org/licenses/by/4.0/
|
Lattice studies of QCD at high temperature has investigated the so called
``screening masses", corresponding to quark-antiquark states propagating in
$spatial$ (rather than time) direction. Thirty years ago we pointed out that
those should correspond to states of 2+1 dimensional quarkonia, and in this
work we show that this correspondence provide quantitative description of the
lattice data.
|
[
{
"created": "Thu, 22 Dec 2022 16:04:54 GMT",
"version": "v1"
}
] |
2022-12-23
|
[
[
"Shuryak",
"Edward",
""
]
] |
Lattice studies of QCD at high temperature has investigated the so called ``screening masses", corresponding to quark-antiquark states propagating in $spatial$ (rather than time) direction. Thirty years ago we pointed out that those should correspond to states of 2+1 dimensional quarkonia, and in this work we show that this correspondence provide quantitative description of the lattice data.
|
1903.05597
|
Diana C. Rivera-Agudelo
|
Diana C. Rivera-Agudelo, S. L. Tostado, Abdel P\'erez-Lorenzana
|
Deviations to Tri-Bi-Maximal mixing in the limit of $\mu-\tau$ symmetry
|
15 pages, 7 figures
| null |
10.1016/j.physletb.2019.05.017
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In the limit of an approximate $\mu-\tau$ symmetry in the neutrino mass
matrix, we explore deviations to the Tri-Bi-Maximal mixing pattern in the
neutrino sector. We consider two different ansatzes for the corrected pattern
to predict the current values of neutrino mixing parameters. We show that it is
possible to constrain the Majorana $CP$ phases by studying their correlation to
the mixing parameters and we study their effects on neutrinoless double beta
decay observables. These predictions are sharp for the quasi-degenerate
ordering and can be tested in upcoming experiments.
|
[
{
"created": "Wed, 13 Mar 2019 16:54:22 GMT",
"version": "v1"
}
] |
2019-05-22
|
[
[
"Rivera-Agudelo",
"Diana C.",
""
],
[
"Tostado",
"S. L.",
""
],
[
"Pérez-Lorenzana",
"Abdel",
""
]
] |
In the limit of an approximate $\mu-\tau$ symmetry in the neutrino mass matrix, we explore deviations to the Tri-Bi-Maximal mixing pattern in the neutrino sector. We consider two different ansatzes for the corrected pattern to predict the current values of neutrino mixing parameters. We show that it is possible to constrain the Majorana $CP$ phases by studying their correlation to the mixing parameters and we study their effects on neutrinoless double beta decay observables. These predictions are sharp for the quasi-degenerate ordering and can be tested in upcoming experiments.
|
1106.3082
|
Viraf Mehta
|
Alon E. Faraggi and Viraf M. Mehta
|
Proton Stability and Light $Z^\prime$ Inspired by String Derived Models
|
22 Pages
| null |
10.1103/PhysRevD.84.086006
| null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Proton stability is one of the most perplexing puzzles in particle physics.
While the renormalizable Standard Model forbids proton decay mediating
operators due to accidental global symmetries, many of its extensions introduce
such dimension four, five and six operators. Furthermore, it is, in general,
expected that quantum gravity only respects local gauge, or discreet,
symmetries. String theory provides the arena to study particle physics in a
consistent framework of perturbative quantum gravity. An appealing proposition,
in this context, is that the dangerous operators are suppressed by an Abelian
gauge symmetry, which is broken near the TeV scale. A viable U(1) symmetry
should also be anomaly free, be family universal, and allow the generation of
fermion masses via the Higgs mechanism. We discuss such U(1) symmetries that
arise in quasi--realistic free fermionic heterotic--string derived models.
Ensuring that the U(1) symmetry is anomaly free at the low scale requires that
the Standard Model spectrum is augmented by additional states that are
compatible with the charge assignments in the string models. We construct such
string--inspired models and discuss some of their phenomenological
implications.
|
[
{
"created": "Wed, 15 Jun 2011 20:01:19 GMT",
"version": "v1"
}
] |
2013-05-29
|
[
[
"Faraggi",
"Alon E.",
""
],
[
"Mehta",
"Viraf M.",
""
]
] |
Proton stability is one of the most perplexing puzzles in particle physics. While the renormalizable Standard Model forbids proton decay mediating operators due to accidental global symmetries, many of its extensions introduce such dimension four, five and six operators. Furthermore, it is, in general, expected that quantum gravity only respects local gauge, or discreet, symmetries. String theory provides the arena to study particle physics in a consistent framework of perturbative quantum gravity. An appealing proposition, in this context, is that the dangerous operators are suppressed by an Abelian gauge symmetry, which is broken near the TeV scale. A viable U(1) symmetry should also be anomaly free, be family universal, and allow the generation of fermion masses via the Higgs mechanism. We discuss such U(1) symmetries that arise in quasi--realistic free fermionic heterotic--string derived models. Ensuring that the U(1) symmetry is anomaly free at the low scale requires that the Standard Model spectrum is augmented by additional states that are compatible with the charge assignments in the string models. We construct such string--inspired models and discuss some of their phenomenological implications.
|
hep-ph/0203179
|
Alexander Kusenko
|
Graciela Gelmini, Alexander Kusenko, and Shmuel Nussinov
|
Experimental identification of non-pointlike dark-matter candidates
|
4 pages; minor changes, references added
|
Phys.Rev.Lett. 89 (2002) 101302
|
10.1103/PhysRevLett.89.101302
|
UCLA/01/TEP/7
|
hep-ph astro-ph
| null |
We show that direct dark matter detection experiments can distinguish between
pointlike and non-pointlike dark-matter candidates. The shape of the nuclear
recoil energy spectrum from pointlike dark-matter particles, e.g., neutralinos,
is determined by the velocity distribution of dark matter in the galactic halo
and by nuclear form factors. In contrast, typical cross sections of
non-pointlike dark matter, for example, Q-balls, have a new form factor, which
decreases rapidly with the recoil energy. Therefore, a signal from
non-pointlike dark matter is expected to peak near the experimental threshold
and to fall off rapidly at higher energies. Although the width of the signal is
practically independent of the dark matter velocity dispersion, its height is
expected to exhibit an annual modulation due to the changes in the dark matter
flux.
|
[
{
"created": "Tue, 19 Mar 2002 07:24:56 GMT",
"version": "v1"
},
{
"created": "Wed, 3 Apr 2002 00:36:41 GMT",
"version": "v2"
},
{
"created": "Thu, 25 Jul 2002 09:48:27 GMT",
"version": "v3"
}
] |
2009-11-07
|
[
[
"Gelmini",
"Graciela",
""
],
[
"Kusenko",
"Alexander",
""
],
[
"Nussinov",
"Shmuel",
""
]
] |
We show that direct dark matter detection experiments can distinguish between pointlike and non-pointlike dark-matter candidates. The shape of the nuclear recoil energy spectrum from pointlike dark-matter particles, e.g., neutralinos, is determined by the velocity distribution of dark matter in the galactic halo and by nuclear form factors. In contrast, typical cross sections of non-pointlike dark matter, for example, Q-balls, have a new form factor, which decreases rapidly with the recoil energy. Therefore, a signal from non-pointlike dark matter is expected to peak near the experimental threshold and to fall off rapidly at higher energies. Although the width of the signal is practically independent of the dark matter velocity dispersion, its height is expected to exhibit an annual modulation due to the changes in the dark matter flux.
|
1801.03803
|
Tanya Obikhod
|
T.V. Obikhod, I.A. Petrenko
|
Computer modeling of properties of Kaluza-Klein particles and their
searches at the LHC
|
16 pages, 9 figures
|
Advances in High Energy Physics, vol. 2018, Article ID 3471023, 9
pages
|
10.1155/2018/3471023
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The Standard Model problems lead to the new theories of extra dimensions:
Randall-Sundrum model, Arkani-Hamed-Dimopoulos-Dvali model and TeV$^{-1}$
model. In the framework of these models with the help of computer program
Pythia8.2 were calculated the production cross sections for Kaluza-Klein
particles at various energies at the LHC. The generation of monojet events from
scalar graviton emission was considered for number of extra dimensions, n=2, 4,
6, for the energy at the LHC 14 TeV. Also are studied the graviton production
processes through the gluon-gluon, quark-gluon and quark-quark fusion processes
and found some periodicity in the behavior of the graviton mass spectrum.
Within Randall-Sundrum scenario were calculated $\sigma\times$ Br for
production process of massive graviton, gg $\rightarrow$ $G^{*}$, and the most
probable processes of graviton decay at 13 TeV, 14 TeV and 100 TeV.
|
[
{
"created": "Thu, 11 Jan 2018 15:06:43 GMT",
"version": "v1"
}
] |
2020-04-23
|
[
[
"Obikhod",
"T. V.",
""
],
[
"Petrenko",
"I. A.",
""
]
] |
The Standard Model problems lead to the new theories of extra dimensions: Randall-Sundrum model, Arkani-Hamed-Dimopoulos-Dvali model and TeV$^{-1}$ model. In the framework of these models with the help of computer program Pythia8.2 were calculated the production cross sections for Kaluza-Klein particles at various energies at the LHC. The generation of monojet events from scalar graviton emission was considered for number of extra dimensions, n=2, 4, 6, for the energy at the LHC 14 TeV. Also are studied the graviton production processes through the gluon-gluon, quark-gluon and quark-quark fusion processes and found some periodicity in the behavior of the graviton mass spectrum. Within Randall-Sundrum scenario were calculated $\sigma\times$ Br for production process of massive graviton, gg $\rightarrow$ $G^{*}$, and the most probable processes of graviton decay at 13 TeV, 14 TeV and 100 TeV.
|
hep-ph/0502141
|
Dan Pirjol
|
Dan Pirjol
|
Theory of hadronic B decays
|
Contribution to the 3rd Conference on Flavor Physics and CP Violation
(FPCP04), Daegu, Korea; 9 pages, 2 figures
|
Nucl.Phys.Proc.Suppl.156:81-86,2006
|
10.1016/j.nuclphysbps.2006.02.139
| null |
hep-ph
| null |
I give an overview of the theory of hadronic nonleptonic B decays into two
light mesons. Using the soft-collinear effective theory (SCET), a factorization
theorem for these processes has been proven to leading order in 1/mb. The
phenomenological implications of this factorization relation for B-> \pi\pi
decays are discussed, together with the prospects for determining the weak
phase \alpha(\phi_2) from these modes.
|
[
{
"created": "Tue, 15 Feb 2005 19:27:43 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Feb 2005 03:40:18 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Pirjol",
"Dan",
""
]
] |
I give an overview of the theory of hadronic nonleptonic B decays into two light mesons. Using the soft-collinear effective theory (SCET), a factorization theorem for these processes has been proven to leading order in 1/mb. The phenomenological implications of this factorization relation for B-> \pi\pi decays are discussed, together with the prospects for determining the weak phase \alpha(\phi_2) from these modes.
|
1504.00332
|
Adrian Carmona
|
Adrian Carmona and Mikael Chala
|
Composite Dark Sectors
|
20 pages, 5 figures; v2; references added and Figure 4 corrected;
matches published version in JHEP
| null | null | null |
hep-ph astro-ph.CO
|
http://creativecommons.org/licenses/by-nc-sa/3.0/
|
We introduce a new paradigm in Composite Dark Sectors, where the full
Standard Model (including the Higgs boson) is extended with a
strongly-interacting composite sector with global symmetry group $\mathcal{G}$
spontaneously broken to $\mathcal{H}\subset \mathcal{G}$. We show that, under
well-motivated conditions, the lightest neutral pseudo Nambu-Goldstone bosons
are natural dark matter candidates for they are protected by a parity symmetry
not even broken in the electroweak phase. These models are characterized by
only two free parameters, namely the typical coupling $g_D$ and the scale $f_D$
of the composite sector, and are therefore very predictive. We consider in
detail two minimal scenarios, $SU(3)/[SU(2)\times U(1)]$ and $[SU(2)^2\times
U(1)]/[SU(2)\times U(1)]$, which provide a dynamical realization of the Inert
Doublet and Triplet models, respectively. We show that the radiatively-induced
potential can be computed in a five-dimensional description with modified
boundary conditions with respect to Composite Higgs models. Finally, the dark
matter candidates are shown to be compatible, in a large region of the
parameter space, with current bounds from dark matter searches as well as
electroweak and collider constraints on new resonances.
|
[
{
"created": "Wed, 1 Apr 2015 18:30:15 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Jun 2015 14:19:50 GMT",
"version": "v2"
}
] |
2015-06-02
|
[
[
"Carmona",
"Adrian",
""
],
[
"Chala",
"Mikael",
""
]
] |
We introduce a new paradigm in Composite Dark Sectors, where the full Standard Model (including the Higgs boson) is extended with a strongly-interacting composite sector with global symmetry group $\mathcal{G}$ spontaneously broken to $\mathcal{H}\subset \mathcal{G}$. We show that, under well-motivated conditions, the lightest neutral pseudo Nambu-Goldstone bosons are natural dark matter candidates for they are protected by a parity symmetry not even broken in the electroweak phase. These models are characterized by only two free parameters, namely the typical coupling $g_D$ and the scale $f_D$ of the composite sector, and are therefore very predictive. We consider in detail two minimal scenarios, $SU(3)/[SU(2)\times U(1)]$ and $[SU(2)^2\times U(1)]/[SU(2)\times U(1)]$, which provide a dynamical realization of the Inert Doublet and Triplet models, respectively. We show that the radiatively-induced potential can be computed in a five-dimensional description with modified boundary conditions with respect to Composite Higgs models. Finally, the dark matter candidates are shown to be compatible, in a large region of the parameter space, with current bounds from dark matter searches as well as electroweak and collider constraints on new resonances.
|
hep-ph/9308248
|
German Valencia
|
S. Dawson and G. Valencia
|
Signals For Parity Violation in the Electroweak Symmetry Breaking Sector
|
Some sentences were added and others changed to clarify the
discussion, 14 pages LaTeX
|
Phys.Rev. D49 (1994) 2188-2196
|
10.1103/PhysRevD.49.2188
| null |
hep-ph
| null |
We consider the possibility of observing a parity violating but $CP$
conserving interaction in the symmetry breaking sector of the electroweak
theory. We find that the best probe for such an interaction is a
forward-backward asymmetry in $W^+W^-$ production from polarized $e^-_R e^+_L$
collisions. An observable asymmetry would be strong evidence against a
custodial $SU(2)$ symmetry. We also discuss the effects of such an interaction
in future $e^- \gamma$ colliders as well as in rare decays of $K$ and $B$
mesons.
|
[
{
"created": "Mon, 9 Aug 1993 19:08:01 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Feb 1994 22:17:24 GMT",
"version": "v2"
}
] |
2009-10-22
|
[
[
"Dawson",
"S.",
""
],
[
"Valencia",
"G.",
""
]
] |
We consider the possibility of observing a parity violating but $CP$ conserving interaction in the symmetry breaking sector of the electroweak theory. We find that the best probe for such an interaction is a forward-backward asymmetry in $W^+W^-$ production from polarized $e^-_R e^+_L$ collisions. An observable asymmetry would be strong evidence against a custodial $SU(2)$ symmetry. We also discuss the effects of such an interaction in future $e^- \gamma$ colliders as well as in rare decays of $K$ and $B$ mesons.
|
1911.08737
|
HyungJoo Kim
|
HyungJoo Kim, Philipp Gubler
|
The $\phi$ meson with finite momentum in a dense medium
|
8 pages, 4 figures; version accepted for publication on PLB
| null |
10.1016/j.physletb.2020.135412
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The dispersion relation of the $\phi$ meson in nuclear matter is studied in a
QCD sum rule approach. In a dense medium, longitudinal and transverse modes of
vector particles can have independently modified dispersion relations due to
broken Lorentz invariance. Employing the full set of independent operators and
corresponding Wilson coefficients up to operator dimension 6, the $\phi$ meson
QCD sum rules are analyzed with changing densities and momenta. The non-trivial
momentum dependence of the $\phi$ meson mass is found to have opposite signs
for the longitudinal and transverse modes. Specifically, the mass is reduced by
5 MeV for the longitudinal mode, while its increase amounts to 7 Mev for the
transverse mode, both at a momentum scale of 1 GeV. In an experiment which does
not distinguish between longitudinal and transverse polarizations, this could
in principle be seen as two separated peaks at large momenta. Taking however
broadening effects into account, the momentum dependence will most likely be
seen as a small but positive effective mass shift and an increased effective
width for non-zero momenta.
|
[
{
"created": "Wed, 20 Nov 2019 06:56:32 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Apr 2020 05:53:47 GMT",
"version": "v2"
}
] |
2020-04-22
|
[
[
"Kim",
"HyungJoo",
""
],
[
"Gubler",
"Philipp",
""
]
] |
The dispersion relation of the $\phi$ meson in nuclear matter is studied in a QCD sum rule approach. In a dense medium, longitudinal and transverse modes of vector particles can have independently modified dispersion relations due to broken Lorentz invariance. Employing the full set of independent operators and corresponding Wilson coefficients up to operator dimension 6, the $\phi$ meson QCD sum rules are analyzed with changing densities and momenta. The non-trivial momentum dependence of the $\phi$ meson mass is found to have opposite signs for the longitudinal and transverse modes. Specifically, the mass is reduced by 5 MeV for the longitudinal mode, while its increase amounts to 7 Mev for the transverse mode, both at a momentum scale of 1 GeV. In an experiment which does not distinguish between longitudinal and transverse polarizations, this could in principle be seen as two separated peaks at large momenta. Taking however broadening effects into account, the momentum dependence will most likely be seen as a small but positive effective mass shift and an increased effective width for non-zero momenta.
|
1810.00486
|
David Blaschke
|
K. A. Bugaev, A. I. Ivanytskyi, V. V. Sagun, B. E. Grinyuk, D. O.
Savchenko, G. M. Zinovjev, E. G. Nikonov, L. V. Bravina, E. E. Zabrodin, D.
B. Blaschke, A. V. Taranenko, L. Turko
|
Hard-core Radius of Nucleons within the Induced Surface Tension Approach
|
12 pages, 4 figures, references added, typos corrected
|
Universe 5 (2), 63 (2019)
|
10.3390/universe5020063
| null |
hep-ph astro-ph.HE nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this work we discuss a novel approach to model the hadronic and nuclear
matter equations of state using the induced surface tension concept. Since the
obtained equations of state, classical and quantum, are among the most
successful ones in describing the properties of low density phases of strongly
interacting matter, they set strong restrictions on the possible value of the
hard-core radius of nucleons. Therefore, we perform a detailed analysis of its
value which follows from hadronic and nuclear matter properties and find the
most trustworthy range of its values: the hard-core radius of nucleons is
0.30--0.36 fm. A comparison with the phenomenology of neutron stars implies
that the hard-core radius of nucleons has to be temperature and density
dependent.
|
[
{
"created": "Sun, 30 Sep 2018 23:48:32 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Nov 2018 18:49:34 GMT",
"version": "v2"
}
] |
2020-05-19
|
[
[
"Bugaev",
"K. A.",
""
],
[
"Ivanytskyi",
"A. I.",
""
],
[
"Sagun",
"V. V.",
""
],
[
"Grinyuk",
"B. E.",
""
],
[
"Savchenko",
"D. O.",
""
],
[
"Zinovjev",
"G. M.",
""
],
[
"Nikonov",
"E. G.",
""
],
[
"Bravina",
"L. V.",
""
],
[
"Zabrodin",
"E. E.",
""
],
[
"Blaschke",
"D. B.",
""
],
[
"Taranenko",
"A. V.",
""
],
[
"Turko",
"L.",
""
]
] |
In this work we discuss a novel approach to model the hadronic and nuclear matter equations of state using the induced surface tension concept. Since the obtained equations of state, classical and quantum, are among the most successful ones in describing the properties of low density phases of strongly interacting matter, they set strong restrictions on the possible value of the hard-core radius of nucleons. Therefore, we perform a detailed analysis of its value which follows from hadronic and nuclear matter properties and find the most trustworthy range of its values: the hard-core radius of nucleons is 0.30--0.36 fm. A comparison with the phenomenology of neutron stars implies that the hard-core radius of nucleons has to be temperature and density dependent.
|
0805.1540
|
Shmuel Nussinov
|
Shmuel Nussinov
|
Is the Froissart bound relevant for the total pp cross section at s=(14
TeV)^2?
|
17 Pages, 1 Figure
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The Froissart bound limmits the asymptotic s->infinity behavior of
crossections by (\pi/t_0) ln ^2 (s/{(s_0)} where t_0 is the lightest exchanged
particle, or more generally the nearest ssingularity, in the t channel. We
suggest that in comparing this bound with data at energies less than those of
LHC, gluebaall masses raather than the small pion mass should be used for
(t_0)^{1/2}.
|
[
{
"created": "Sun, 11 May 2008 15:53:55 GMT",
"version": "v1"
}
] |
2008-05-13
|
[
[
"Nussinov",
"Shmuel",
""
]
] |
The Froissart bound limmits the asymptotic s->infinity behavior of crossections by (\pi/t_0) ln ^2 (s/{(s_0)} where t_0 is the lightest exchanged particle, or more generally the nearest ssingularity, in the t channel. We suggest that in comparing this bound with data at energies less than those of LHC, gluebaall masses raather than the small pion mass should be used for (t_0)^{1/2}.
|
2106.13534
|
James Ingoldby
|
T. Appelquist, R. C. Brower, K. K. Cushman, G. T. Fleming, A.
Gasbarro, A. Hasenfratz, J. Ingoldby, X. Y. Jin, J. Kiskis, E. T. Neil, J. C.
Osborn, C. Rebbi, E. Rinaldi, D. Schaich, P. Vranas, E. Weinberg, O. Witzel
(for the LSD Collaboration)
|
Goldstone Boson Scattering with a Light Composite Scalar
|
13 pages, 6 figures, 4 tables. References and clarifying comments
added. To match published version
| null |
10.1103/PhysRevD.105.034505
|
RIKEN-iTHEMS-Report-21, LLNL-JRNL-823329, SI-HEP-2021-18
|
hep-ph hep-lat
|
http://creativecommons.org/licenses/by/4.0/
|
The appearance of a light composite $0^+$ scalar resonance in nearly
conformal gauge-fermion theories motivates further study of the low energy
structure of these theories. To this end, we present a nonperturbative lattice
calculation of s-wave scattering of Goldstone bosons in the maximal-isospin
channel in SU(3) gauge theory with $N_f=8$ light, degenerate flavors. The
scattering phase shift is measured both for different values of the underlying
fermion mass and for different values of the scattering momentum. We examine
the effect of a light flavor-singlet scalar (reported in earlier studies) on
Goldstone boson scattering, employing a dilaton effective field theory (EFT) at
the tree level. The EFT gives a good description of the scattering data,
insofar as the magnitude of deviations between EFT and lattice data are no
larger than the expected size of next-to-leading order corrections in the EFT.
|
[
{
"created": "Fri, 25 Jun 2021 09:57:05 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Mar 2022 14:14:08 GMT",
"version": "v2"
}
] |
2022-03-07
|
[
[
"Appelquist",
"T.",
"",
"for the LSD Collaboration"
],
[
"Brower",
"R. C.",
"",
"for the LSD Collaboration"
],
[
"Cushman",
"K. K.",
"",
"for the LSD Collaboration"
],
[
"Fleming",
"G. T.",
"",
"for the LSD Collaboration"
],
[
"Gasbarro",
"A.",
"",
"for the LSD Collaboration"
],
[
"Hasenfratz",
"A.",
"",
"for the LSD Collaboration"
],
[
"Ingoldby",
"J.",
"",
"for the LSD Collaboration"
],
[
"Jin",
"X. Y.",
"",
"for the LSD Collaboration"
],
[
"Kiskis",
"J.",
"",
"for the LSD Collaboration"
],
[
"Neil",
"E. T.",
"",
"for the LSD Collaboration"
],
[
"Osborn",
"J. C.",
"",
"for the LSD Collaboration"
],
[
"Rebbi",
"C.",
"",
"for the LSD Collaboration"
],
[
"Rinaldi",
"E.",
"",
"for the LSD Collaboration"
],
[
"Schaich",
"D.",
"",
"for the LSD Collaboration"
],
[
"Vranas",
"P.",
"",
"for the LSD Collaboration"
],
[
"Weinberg",
"E.",
"",
"for the LSD Collaboration"
],
[
"Witzel",
"O.",
"",
"for the LSD Collaboration"
]
] |
The appearance of a light composite $0^+$ scalar resonance in nearly conformal gauge-fermion theories motivates further study of the low energy structure of these theories. To this end, we present a nonperturbative lattice calculation of s-wave scattering of Goldstone bosons in the maximal-isospin channel in SU(3) gauge theory with $N_f=8$ light, degenerate flavors. The scattering phase shift is measured both for different values of the underlying fermion mass and for different values of the scattering momentum. We examine the effect of a light flavor-singlet scalar (reported in earlier studies) on Goldstone boson scattering, employing a dilaton effective field theory (EFT) at the tree level. The EFT gives a good description of the scattering data, insofar as the magnitude of deviations between EFT and lattice data are no larger than the expected size of next-to-leading order corrections in the EFT.
|
1110.5642
|
Elias Kiritsis
|
Elias Kiritsis, Anastasios Taliotis
|
Mini-Black-Hole production at RHIC and LHC
|
Latex, 10 pages, 2 figures
| null | null |
CCTP-2011-35
|
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We argue that heavy-ion collisions provide the best testing ground for
mini-black hole physics as $M_P\simeq 4 GeV$ for the gravity dual of YM and
give concrete evidence for a new extra dimension, that is visible only to the
strong interactions. We analyse the process of production evolution and decay
of the mini-black-holes by using recent results on gravity duals of YM. There
are several novelties compared with the traditional story of black hole
evaporation, including Bjorken scaling instead of sphericity, evaporation via
bubble nucleation instead of the Hawking mechanism and lepton-poor final
states. Multiplicities are estimated using shock-wave scattering techniques. It
is argued that high-multiplicity/high energy pp collisions will also show
similar characteristics of mini-black-hole production and decay.
|
[
{
"created": "Tue, 25 Oct 2011 20:00:04 GMT",
"version": "v1"
}
] |
2011-10-27
|
[
[
"Kiritsis",
"Elias",
""
],
[
"Taliotis",
"Anastasios",
""
]
] |
We argue that heavy-ion collisions provide the best testing ground for mini-black hole physics as $M_P\simeq 4 GeV$ for the gravity dual of YM and give concrete evidence for a new extra dimension, that is visible only to the strong interactions. We analyse the process of production evolution and decay of the mini-black-holes by using recent results on gravity duals of YM. There are several novelties compared with the traditional story of black hole evaporation, including Bjorken scaling instead of sphericity, evaporation via bubble nucleation instead of the Hawking mechanism and lepton-poor final states. Multiplicities are estimated using shock-wave scattering techniques. It is argued that high-multiplicity/high energy pp collisions will also show similar characteristics of mini-black-hole production and decay.
|
1712.07126
|
Doojin Kim
|
Gian F. Giudice, Doojin Kim, Jong-Chul Park, Seodong Shin
|
Inelastic Boosted Dark Matter at Direct Detection Experiments
|
12 pages, 6 figures, 2 tables
| null |
10.1016/j.physletb.2018.03.043
|
CERN-TH-2017-258, EFI-17-24
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We explore a novel class of multi-particle dark sectors, called Inelastic
Boosted Dark Matter (iBDM). These models are constructed by combining
properties of particles that scatter off matter by making transitions to
heavier states (Inelastic Dark Matter) with properties of particles that are
produced with a large Lorentz boost in annihilation processes in the galactic
halo (Boosted Dark Matter). This combination leads to new signals that can be
observed at ordinary direct detection experiments, but require unconventional
searches for energetic recoil electrons in coincidence with displaced
multi-track events. Related experimental strategies can also be used to probe
MeV-range boosted dark matter via their interactions with electrons inside the
target material.
|
[
{
"created": "Tue, 19 Dec 2017 19:00:01 GMT",
"version": "v1"
}
] |
2018-05-09
|
[
[
"Giudice",
"Gian F.",
""
],
[
"Kim",
"Doojin",
""
],
[
"Park",
"Jong-Chul",
""
],
[
"Shin",
"Seodong",
""
]
] |
We explore a novel class of multi-particle dark sectors, called Inelastic Boosted Dark Matter (iBDM). These models are constructed by combining properties of particles that scatter off matter by making transitions to heavier states (Inelastic Dark Matter) with properties of particles that are produced with a large Lorentz boost in annihilation processes in the galactic halo (Boosted Dark Matter). This combination leads to new signals that can be observed at ordinary direct detection experiments, but require unconventional searches for energetic recoil electrons in coincidence with displaced multi-track events. Related experimental strategies can also be used to probe MeV-range boosted dark matter via their interactions with electrons inside the target material.
|
1112.4568
|
Shinhong Kim
|
Shin-Hong Kim, Ken-ichi Takemasa, Yuji Takeuchi, and Shuji Matsuura
|
Search for Radiative Decays of Cosmic Background Neutrino using Cosmic
Infrared Background Energy Spectrum
| null |
J. Phys. Soc Jpn. , Vol.81, No.2, p.024101 (2012)
|
10.1143/JPSJ.81.024101
| null |
hep-ph astro-ph.CO hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We propose to search for the neutrino radiative decay by fitting a photon
energy spectrum of the cosmic infrared background to a sum of the photon energy
spectrum from the neutrino radiative decay and a continuum. By comparing the
present cosmic infrared background energy spectrum observed by AKARI and
Spitzer to the photon energy spectrum expected from neutrino radiative decay
with a maximum likelihood method, we obatined a lifetime lower limit of $3.1
\times 10^{12}$ to $3.8 \times 10^{12}$ years at 95% confidence level for the
third generation neutrino $\nu_3$ in the $\nu_3$ mass range between 50 \mmev
and 150 \mmev under the present constraints by the neutrino oscillation
measurements. In the left-right symmetric model, the minimum lifetime of
$\nu_3$ is predicted to be $1.5 \times 10^{17}$ years for $m_3$ of 50 \mmev. We
studied the feasibility of the observation of the neutrino radiative decay with
a lifetime of $1.5 \times 10^{17}$ years, by measuring a continuous energy
spectrum of the cosmic infrared background.
|
[
{
"created": "Tue, 20 Dec 2011 04:36:22 GMT",
"version": "v1"
}
] |
2012-01-19
|
[
[
"Kim",
"Shin-Hong",
""
],
[
"Takemasa",
"Ken-ichi",
""
],
[
"Takeuchi",
"Yuji",
""
],
[
"Matsuura",
"Shuji",
""
]
] |
We propose to search for the neutrino radiative decay by fitting a photon energy spectrum of the cosmic infrared background to a sum of the photon energy spectrum from the neutrino radiative decay and a continuum. By comparing the present cosmic infrared background energy spectrum observed by AKARI and Spitzer to the photon energy spectrum expected from neutrino radiative decay with a maximum likelihood method, we obatined a lifetime lower limit of $3.1 \times 10^{12}$ to $3.8 \times 10^{12}$ years at 95% confidence level for the third generation neutrino $\nu_3$ in the $\nu_3$ mass range between 50 \mmev and 150 \mmev under the present constraints by the neutrino oscillation measurements. In the left-right symmetric model, the minimum lifetime of $\nu_3$ is predicted to be $1.5 \times 10^{17}$ years for $m_3$ of 50 \mmev. We studied the feasibility of the observation of the neutrino radiative decay with a lifetime of $1.5 \times 10^{17}$ years, by measuring a continuous energy spectrum of the cosmic infrared background.
|
hep-ph/9412386
|
My Account
|
J. Lopez
|
A survey of phenomenological constraints on supergravity models
|
8 pages, LaTeX, 5 figures (included). To appear in proceedings of the
Beyond the Standard Model IV Conference, Lake Tahoe, CA, Dec 13-18, 1994
| null | null |
CTP-TAMU-68/94
|
hep-ph
| null |
We advocate the study of supergravity models as well motivated few-parameter
low-energy supersymmetric models. In this context we survey a broad range of
phenomenological constraints and future tests, including present and
near-future Tevatron ($\tilde q,\tilde g,\chi^\pm_1,\tilde t_1$) and LEP
($h,\chi^\pm_1$) mass limits, collider indirect tests ($\Gamma_Z^{\rm
inv},R_b,m_t$), rare processes ($b\to s\gamma,(g-2)_\mu$), proton decay, and
dark matter (cosmology, direct and indirect detection).
|
[
{
"created": "Thu, 29 Dec 1994 18:26:14 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Lopez",
"J.",
""
]
] |
We advocate the study of supergravity models as well motivated few-parameter low-energy supersymmetric models. In this context we survey a broad range of phenomenological constraints and future tests, including present and near-future Tevatron ($\tilde q,\tilde g,\chi^\pm_1,\tilde t_1$) and LEP ($h,\chi^\pm_1$) mass limits, collider indirect tests ($\Gamma_Z^{\rm inv},R_b,m_t$), rare processes ($b\to s\gamma,(g-2)_\mu$), proton decay, and dark matter (cosmology, direct and indirect detection).
|
1803.06498
|
Rachid Markazi M
|
R. Markazi and N. El Biaze
|
Insight on confinement using scalar field interactions
| null | null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The scalar field plays an fundamental role in the investigation of
confinement property characterising many particle physics models. This is
achieved by coupling this particle directly with gauge fields at the lagrangian
level. We have adopted the same approach {[}10{]} to determine a potential as a
perturbative series in terms of interquark distance. In order to introduce the
gravitational effects and inspired from bag models, we implement a scalar field
which interacts both with the vacuum and the electron field. In this context
and with presence of the vacuum condensates, it is possible to derive a more
accurate expression of the electron energy.
|
[
{
"created": "Sat, 17 Mar 2018 13:01:10 GMT",
"version": "v1"
}
] |
2018-03-20
|
[
[
"Markazi",
"R.",
""
],
[
"Biaze",
"N. El",
""
]
] |
The scalar field plays an fundamental role in the investigation of confinement property characterising many particle physics models. This is achieved by coupling this particle directly with gauge fields at the lagrangian level. We have adopted the same approach {[}10{]} to determine a potential as a perturbative series in terms of interquark distance. In order to introduce the gravitational effects and inspired from bag models, we implement a scalar field which interacts both with the vacuum and the electron field. In this context and with presence of the vacuum condensates, it is possible to derive a more accurate expression of the electron energy.
|
1307.0708
|
Fedor Bezrukov
|
Fedor Bezrukov
|
The Higgs field as an inflaton
|
21 pages, 4 figures. Journal version -- several clarifications and
improved list of references
|
Class. Quantum Grav. 30 (2013) 214001
|
10.1088/0264-9381/30/21/214001
|
RBRC1042
|
hep-ph gr-qc hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The Higgs field of the pure Standard Model can lead to the inflationary
expansion of the early Universe if it is non-minimally coupled to gravity. The
model predicts Cosmic Microwave Background (CMB) parameters in perfect
agreement with the current observations and has implications for the Higgs
boson mass. We review the model, its predictions, problems arising with its
quantization and some closely related models.
|
[
{
"created": "Tue, 2 Jul 2013 14:08:01 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Oct 2013 19:58:41 GMT",
"version": "v2"
}
] |
2013-10-09
|
[
[
"Bezrukov",
"Fedor",
""
]
] |
The Higgs field of the pure Standard Model can lead to the inflationary expansion of the early Universe if it is non-minimally coupled to gravity. The model predicts Cosmic Microwave Background (CMB) parameters in perfect agreement with the current observations and has implications for the Higgs boson mass. We review the model, its predictions, problems arising with its quantization and some closely related models.
|
hep-ph/9708245
|
Modugno Michele
|
R. Gatto, M. Modugno and G. Pettini
|
Equation of state for the 2+1 dimensional Gross-Neveu model at order 1/N
|
19 pages, RevTeX, 10 figures.ps
|
Phys.Rev. D57 (1998) 4995-5003
|
10.1103/PhysRevD.57.4995
|
UGVA-DPT 1997/07/984
|
hep-ph
| null |
We calculate the equation of state of the Gross-Neveu model in 2+1 dimensions
at order 1/N, where N is the number of fermion species. We make use of a
general formula valid for four-fermion theories, previously applied to the
model in 1+1 dimensions. We consider both the discrete and continuous symmetry
versions of the model. We show that the pion-like excitations give the dominant
contribution at low temperatures. The range of validity for such pion dominance
is analyzed. The complete analysis from low to high temperatures also shows
that in the critical region the role of composite states is relevant, even for
quite large N, and that the free-component behaviour at high T starts at about
twice the mean field critical temperature.
|
[
{
"created": "Tue, 5 Aug 1997 09:10:56 GMT",
"version": "v1"
}
] |
2009-10-30
|
[
[
"Gatto",
"R.",
""
],
[
"Modugno",
"M.",
""
],
[
"Pettini",
"G.",
""
]
] |
We calculate the equation of state of the Gross-Neveu model in 2+1 dimensions at order 1/N, where N is the number of fermion species. We make use of a general formula valid for four-fermion theories, previously applied to the model in 1+1 dimensions. We consider both the discrete and continuous symmetry versions of the model. We show that the pion-like excitations give the dominant contribution at low temperatures. The range of validity for such pion dominance is analyzed. The complete analysis from low to high temperatures also shows that in the critical region the role of composite states is relevant, even for quite large N, and that the free-component behaviour at high T starts at about twice the mean field critical temperature.
|
1802.03005
|
Yang Bai
|
Yang Bai and Bogdan A. Dobrescu
|
Collider Tests of the Renormalizable Coloron Model
|
39 pages, 15 figures, a factor of 2 corrected in Eq. (2.24) for the
coloron width into color-octet scalars, with the calculation given in
appendix B
| null |
10.1007/JHEP04(2018)114
|
Fermilab-PUB-17-555-T
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The coloron, a massive version of the gluon present in gauge extensions of
QCD, has been searched for at the LHC as a dijet or top quark pair resonance.
We point out that in the Renormalizable Coloron Model (ReCoM) with a minimal
field content to break the gauge symmetry, a color-octet scalar and a singlet
scalar are naturally lighter than the coloron because they are pseudo
Nambu-Goldstone bosons. Consequently, the coloron may predominantly decay into
scalar pairs, leading to novel signatures at the LHC. When the color-octet
scalar is lighter than the singlet, or when the singlet mass is above roughly 1
TeV, the signatures consist of multi-jet resonances of multiplicity up to 12,
including topologies with multi-prong jet substructure, slightly displaced
vertices, and sometimes a top quark pair. When the singlet is the lightest
ReCoM boson and lighter than about 1 TeV, its main decays ($W^+W^-$, $\gamma
Z$, $ZZ$) arise at three loops. The LHC signatures then involve two or four
boosted electroweak bosons, often originating from highly displaced vertices,
plus one or two pairs of prompt jets or top quarks.
|
[
{
"created": "Thu, 8 Feb 2018 18:52:29 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Sep 2018 02:44:03 GMT",
"version": "v2"
}
] |
2018-09-10
|
[
[
"Bai",
"Yang",
""
],
[
"Dobrescu",
"Bogdan A.",
""
]
] |
The coloron, a massive version of the gluon present in gauge extensions of QCD, has been searched for at the LHC as a dijet or top quark pair resonance. We point out that in the Renormalizable Coloron Model (ReCoM) with a minimal field content to break the gauge symmetry, a color-octet scalar and a singlet scalar are naturally lighter than the coloron because they are pseudo Nambu-Goldstone bosons. Consequently, the coloron may predominantly decay into scalar pairs, leading to novel signatures at the LHC. When the color-octet scalar is lighter than the singlet, or when the singlet mass is above roughly 1 TeV, the signatures consist of multi-jet resonances of multiplicity up to 12, including topologies with multi-prong jet substructure, slightly displaced vertices, and sometimes a top quark pair. When the singlet is the lightest ReCoM boson and lighter than about 1 TeV, its main decays ($W^+W^-$, $\gamma Z$, $ZZ$) arise at three loops. The LHC signatures then involve two or four boosted electroweak bosons, often originating from highly displaced vertices, plus one or two pairs of prompt jets or top quarks.
|
1808.00805
|
Shashank Bhatnagar Dr.
|
Hluf Negash, Shashank Bhatnagar
|
Double charmonium productions in electron-positron annihilation using
Bethe-Salpeter approach
|
1 figure, 3 tables
|
Adv. in High Energy Physics Vol. 2019, 4029356 (2019)
|
10.1155/2019/4029356
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We calculate the double charmonium production cross section within the
framework of $4\times 4$ Bethe-Salpeter Equation in the electron-positron
annihilation, at center of mass energy $\sqrt{s}= 10.6$GeV, that proceeds
through the exchange of a single virtual photon. In this calculation, we make
use of the full Dirac structure of 4D BS wave functions of these charmonia,
with the incorporation of all the Dirac covariants (both leading and
sub-leading). The calculated cross-sections for the double charmonium
productions for final states, ($J/\Psi, \eta_c$); ($\Psi',\eta_c$) ; ($J/\Psi,
\eta_c'$); and ($\Psi',\eta_c'$) are close to experimental data, and in broad
agreement with results of other theoretical models.
|
[
{
"created": "Thu, 2 Aug 2018 13:33:11 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Aug 2018 13:36:59 GMT",
"version": "v2"
},
{
"created": "Wed, 6 Mar 2019 08:51:20 GMT",
"version": "v3"
}
] |
2019-03-07
|
[
[
"Negash",
"Hluf",
""
],
[
"Bhatnagar",
"Shashank",
""
]
] |
We calculate the double charmonium production cross section within the framework of $4\times 4$ Bethe-Salpeter Equation in the electron-positron annihilation, at center of mass energy $\sqrt{s}= 10.6$GeV, that proceeds through the exchange of a single virtual photon. In this calculation, we make use of the full Dirac structure of 4D BS wave functions of these charmonia, with the incorporation of all the Dirac covariants (both leading and sub-leading). The calculated cross-sections for the double charmonium productions for final states, ($J/\Psi, \eta_c$); ($\Psi',\eta_c$) ; ($J/\Psi, \eta_c'$); and ($\Psi',\eta_c'$) are close to experimental data, and in broad agreement with results of other theoretical models.
|
0711.1916
|
Jos\'e Francisco Zurita
|
Daniel de Florian and Jos\'e Zurita
|
Soft-gluon resummation for pseudoscalar Higgs boson production at hadron
colliders
|
10 pages, 7 figures, accepted by Physics Letters B
|
Phys.Lett.B659:813-820,2008
|
10.1016/j.physletb.2007.11.018
| null |
hep-ph
| null |
We compute the threshold-resummed cross section for pseudo-scalar MSSM Higgs
boson production by gluon fusion at hadron colliders. The calculation is
performed at next-to-next-to leading logarithmic accuracy. We present results
for both the LHC and Tevatron Run II. We analyze the factorization and
renormalization scale dependence of the results, finding that after performing
the resummation the corresponding cross section can be computed with an
accuracy better than 10%.
|
[
{
"created": "Tue, 13 Nov 2007 04:39:16 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"de Florian",
"Daniel",
""
],
[
"Zurita",
"José",
""
]
] |
We compute the threshold-resummed cross section for pseudo-scalar MSSM Higgs boson production by gluon fusion at hadron colliders. The calculation is performed at next-to-next-to leading logarithmic accuracy. We present results for both the LHC and Tevatron Run II. We analyze the factorization and renormalization scale dependence of the results, finding that after performing the resummation the corresponding cross section can be computed with an accuracy better than 10%.
|
1605.03986
|
Stella Riad
|
Claudia Hagedorn, Tommy Ohlsson, Stella Riad and Michael A. Schmidt
|
Unification of Gauge Couplings in Radiative Neutrino Mass Models
|
28 pages, 2 figures. Updated to match journal version
|
JHEP 09 (2016) 111
|
10.1007/JHEP09(2016)111
|
CP3-Origins-2016-024 DNRF90, DIAS-2016-024
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the possibility of gauge coupling unification in various
radiative neutrino mass models, which generate neutrino masses at one- and/or
two-loop level. Renormalization group running of gauge couplings is performed
analytically and numerically at one- and two-loop order, respectively. We study
three different classes of neutrino mass models: (I) minimal ultraviolet
completions of the dimension-7 $\Delta L=2$ operators which generate neutrino
masses at one- and/or two-loop level without and with dark matter candidates,
(II) models with dark matter which lead to neutrino masses at one-loop level
and (III) models with particles in the adjoint representation of
$\mathrm{SU}(3)$. In class (I), gauge couplings unify in a few models and
adding dark matter amplifies the chances for unification. In class (II), about
a quarter of the models admit gauge coupling unification. In class (III), none
of the models leads to gauge coupling unification. Regarding the scale of
unification, we find values between $10^{14}$ GeV and $10^{16}$ GeV for models
belonging to class (I) without dark matter, whereas models in class (I) with
dark matter as well as models of class (II) prefer values in the range $5 \cdot
10^{10}-5 \cdot 10^{14}$ GeV.
|
[
{
"created": "Thu, 12 May 2016 20:51:20 GMT",
"version": "v1"
},
{
"created": "Fri, 9 Sep 2016 14:44:43 GMT",
"version": "v2"
}
] |
2016-09-22
|
[
[
"Hagedorn",
"Claudia",
""
],
[
"Ohlsson",
"Tommy",
""
],
[
"Riad",
"Stella",
""
],
[
"Schmidt",
"Michael A.",
""
]
] |
We investigate the possibility of gauge coupling unification in various radiative neutrino mass models, which generate neutrino masses at one- and/or two-loop level. Renormalization group running of gauge couplings is performed analytically and numerically at one- and two-loop order, respectively. We study three different classes of neutrino mass models: (I) minimal ultraviolet completions of the dimension-7 $\Delta L=2$ operators which generate neutrino masses at one- and/or two-loop level without and with dark matter candidates, (II) models with dark matter which lead to neutrino masses at one-loop level and (III) models with particles in the adjoint representation of $\mathrm{SU}(3)$. In class (I), gauge couplings unify in a few models and adding dark matter amplifies the chances for unification. In class (II), about a quarter of the models admit gauge coupling unification. In class (III), none of the models leads to gauge coupling unification. Regarding the scale of unification, we find values between $10^{14}$ GeV and $10^{16}$ GeV for models belonging to class (I) without dark matter, whereas models in class (I) with dark matter as well as models of class (II) prefer values in the range $5 \cdot 10^{10}-5 \cdot 10^{14}$ GeV.
|
0711.2359
|
Javier Vijande Asenjo
|
J. Vijande, A. Valcarce, F. Fernandez
|
B meson spectroscopy
|
8 pages, 5 tables. Accepted for publication in Physical Review D
|
Phys.Rev.D77:017501,2008
|
10.1103/PhysRevD.77.017501
| null |
hep-ph hep-ex
| null |
We study the $B$ meson spectroscopy allowing the mixture of conventional $P$
wave quark-antiquark states and four-quark components. A similar picture was
used to describe the new $D_J$ and $D_{sJ}$ open charm mesons. The four-quark
components shift the masses of some positive parity $B_{sJ}$ states below their
corresponding isospin preserving two-meson threshold and therefore they are
expected to be narrow. Electromagnetic decay widths are analyzed.
|
[
{
"created": "Thu, 15 Nov 2007 08:15:18 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Vijande",
"J.",
""
],
[
"Valcarce",
"A.",
""
],
[
"Fernandez",
"F.",
""
]
] |
We study the $B$ meson spectroscopy allowing the mixture of conventional $P$ wave quark-antiquark states and four-quark components. A similar picture was used to describe the new $D_J$ and $D_{sJ}$ open charm mesons. The four-quark components shift the masses of some positive parity $B_{sJ}$ states below their corresponding isospin preserving two-meson threshold and therefore they are expected to be narrow. Electromagnetic decay widths are analyzed.
|
hep-ph/0302120
|
Alejandro Gutierrez
|
A. Guti\'errez-Rodr\'iguez (Zacatecas University, Mexico), M. A.
Hern\'andez-Ru\'iz (Zacatecas University, Mexico) and O. A. Sampayo (Mar del
Plata University, Argentina)
|
Higgs Pair-Production in the Standard Model at Next Generation Linear
$e^+e^-$ Colliders
|
8 pages, 4 figures
|
Phys.Rev. D67 (2003) 074018
|
10.1103/PhysRevD.67.074018
| null |
hep-ph
| null |
We study the Higgs pair-production in the Standard Model of the strong and
electroweak interactions at future $e^{+}e^{-}$ collider energies, with the
reaction $e^{+}e^{-}\to t \bar t HH$. We evaluated the total cross section of
$t\bar tHH$ and calculate the number total of events considering the complete
set of Feynman diagrams at tree-level. The numerical computation is done for
the energy which is expected to be available at a possible Next Linear
$e^{+}e^{-}$ Collider: with center-of-mass energy $800, 1600$ $GeV$ and
luminosity 1000 $fb^{-1}$.
|
[
{
"created": "Fri, 14 Feb 2003 20:43:04 GMT",
"version": "v1"
}
] |
2016-08-16
|
[
[
"Gutiérrez-Rodríguez",
"A.",
"",
"Zacatecas University, Mexico"
],
[
"Hernández-Ruíz",
"M. A.",
"",
"Zacatecas University, Mexico"
],
[
"Sampayo",
"O. A.",
"",
"Mar del\n Plata University, Argentina"
]
] |
We study the Higgs pair-production in the Standard Model of the strong and electroweak interactions at future $e^{+}e^{-}$ collider energies, with the reaction $e^{+}e^{-}\to t \bar t HH$. We evaluated the total cross section of $t\bar tHH$ and calculate the number total of events considering the complete set of Feynman diagrams at tree-level. The numerical computation is done for the energy which is expected to be available at a possible Next Linear $e^{+}e^{-}$ Collider: with center-of-mass energy $800, 1600$ $GeV$ and luminosity 1000 $fb^{-1}$.
|
1904.12566
|
Gayatri Ghosh Dr.
|
Gayatri Ghosh
|
Probing new physics in rare decays of b-flavored Hadrons $b\to s \gamma$
in CMSSM/mSUGRA SUSY SO (10) theories
|
13 pages, 5 figures
|
Gradiva,ISSN:0363-8057,87-99, VOLUME-8-ISSUE-6-2022
|
10.37897/GRJ-2021-V7I11-21-49884
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The implications of the latest measurement of the branching fraction of B($
b\rightarrow s \gamma $) of b hadrons, which is another signature of New
Physics beyond Standard Model is presented here. The quark transitions $ b
\rightarrow s $, $ b \rightarrow d $ do not happen at tree level in the
Standard Model as the Z boson does not couple to quarks of different flavour.
In this work the present bounds on the quark transition $ b \rightarrow s $
within the constrained minimal supersymmetric extension of the Standard Model
(CMSSM), in which there are three independent soft SUSY breaking parameters $
m_{0} $, $ m_{1/2} $ and $ A_{0} $ is illustrated. The recent constraint on B($
b\rightarrow s \gamma $), B($ b_{s}\rightarrow \mu^{+}\mu^{-}$), the recently
measured value of Higgs mass at LHC, $ M_{h} $, the value of $\theta_{13}$ from
reactor data and the Higgs branching ratios set very strong constraints on New
Physics models, in particular supersymmetry. A new epoch for this research has
begun since the Large Hadron Collider beauty (LHCb) experiment started
affording data for various observables for these decays. The results presented
here in mSUGRA/CMSSM models may gain access to supersymmetry even at scales
beyond the direct reach of the LHC and the susceptibleness to test these
theories at the next run of LHC is also explored.
|
[
{
"created": "Mon, 29 Apr 2019 11:45:43 GMT",
"version": "v1"
},
{
"created": "Wed, 8 May 2019 07:25:54 GMT",
"version": "v2"
},
{
"created": "Wed, 19 Jun 2019 13:46:34 GMT",
"version": "v3"
}
] |
2022-10-26
|
[
[
"Ghosh",
"Gayatri",
""
]
] |
The implications of the latest measurement of the branching fraction of B($ b\rightarrow s \gamma $) of b hadrons, which is another signature of New Physics beyond Standard Model is presented here. The quark transitions $ b \rightarrow s $, $ b \rightarrow d $ do not happen at tree level in the Standard Model as the Z boson does not couple to quarks of different flavour. In this work the present bounds on the quark transition $ b \rightarrow s $ within the constrained minimal supersymmetric extension of the Standard Model (CMSSM), in which there are three independent soft SUSY breaking parameters $ m_{0} $, $ m_{1/2} $ and $ A_{0} $ is illustrated. The recent constraint on B($ b\rightarrow s \gamma $), B($ b_{s}\rightarrow \mu^{+}\mu^{-}$), the recently measured value of Higgs mass at LHC, $ M_{h} $, the value of $\theta_{13}$ from reactor data and the Higgs branching ratios set very strong constraints on New Physics models, in particular supersymmetry. A new epoch for this research has begun since the Large Hadron Collider beauty (LHCb) experiment started affording data for various observables for these decays. The results presented here in mSUGRA/CMSSM models may gain access to supersymmetry even at scales beyond the direct reach of the LHC and the susceptibleness to test these theories at the next run of LHC is also explored.
|
1711.05921
|
Carlos Arg\"uelles Delgado
|
Zander Moss and Marjon H. Moulai and Carlos A. Arg\"uelles and Janet
M. Conrad
|
Exploring a Non-Minimal Sterile Neutrino Model Involving Decay at
IceCube and Beyond
|
12 pages, 7 figures. Find code at:
https://github.com/arguelles/nuSQUIDSDecay
|
Phys. Rev. D 97, 055017 (2018)
|
10.1103/PhysRevD.97.055017
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the phenomenology of neutrino decay together with neutrino
oscillations in the context of eV-scale sterile neutrinos. We review the
formalism of visible neutrino decay in which one of the decay products is a
neutrino that potentially can be observed. We apply the formalism developed for
decay to the recent sterile neutrino search performed by IceCube with TeV
neutrinos. We show that for $\nu_4$ lifetime $\tau_4/m_4 \lesssim 10^{-16} {\rm
eV^{-1}s}$, the interpretation of the high-energy IceCube analysis can be
significantly changed.
|
[
{
"created": "Thu, 16 Nov 2017 04:27:40 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Nov 2017 19:21:34 GMT",
"version": "v2"
}
] |
2018-03-21
|
[
[
"Moss",
"Zander",
""
],
[
"Moulai",
"Marjon H.",
""
],
[
"Argüelles",
"Carlos A.",
""
],
[
"Conrad",
"Janet M.",
""
]
] |
We study the phenomenology of neutrino decay together with neutrino oscillations in the context of eV-scale sterile neutrinos. We review the formalism of visible neutrino decay in which one of the decay products is a neutrino that potentially can be observed. We apply the formalism developed for decay to the recent sterile neutrino search performed by IceCube with TeV neutrinos. We show that for $\nu_4$ lifetime $\tau_4/m_4 \lesssim 10^{-16} {\rm eV^{-1}s}$, the interpretation of the high-energy IceCube analysis can be significantly changed.
|
2310.07453
|
Wen-long Sang
|
Yu-Dong Zhang, Xiao-Wei Bai, Feng Feng, Wen-Long Sang, Ming-Zhen Zhou
|
Two-Loop QCD Corrections to C even Bottomonium Exclusive Decays to
Double $J/\psi$
|
17 pages, 3 figures, 4 tables; The affiliation and acknowledgement of
the first author are updated
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In the framework of nonrelativistic QCD (NRQCD) factorization, we compute
both the polarized and the unpolarized decay widths for the processes
$\eta_b(\chi_{bJ})\to J/\psi J/\psi$, accurate up to
next-to-next-to-leading-order (NNLO) in $\alpha_s$. For the first time, we
confirm that the NRQCD factorization does hold at NNLO for the process
involving triple quarkonia. We find the radiative corrections are considerable.
In particular for $\chi_{b2}$, both $\mathcal{O}(\alpha_s)$ and
$\mathcal{O}(\alpha_s^2)$ corrections are sizable and negative, and can
significantly reduce the leading order prediction. At NNLO, the branching
fractions are $8.2\times 10^{-7}$, $6.2\times 10^{-6}$, $7.2\times 10^{-7}$ and
$2.7\times 10^{-6}$ for $\eta_b$, $\chi_{b0}$, $\chi_{b1}$ and $\chi_{b2}$
decay, respectively. Our theoretical predictions are consistent with the upper
limits measured by the {\tt Belle} Collaboration. Moreover, we investigate the
dependence of the theoretical predictions on the ratio of the charm quark mass
and the bottom quark mass. By fixing $m_b$ and varying $m_c$ from $1.25$ to
$1.9$ GeV, we find the branching fraction can change a factor of $2$, $3$, and
$6$ for $\eta_b$, $\chi_{b0}$, and $\chi_{b1}$, respectively. In the
phenomenological analysis, with the integrate luminosity $\mathcal{L}=100\,{\rm
fb}^{-1}$, we expect about $(5-10)\times 10^3$ $\eta_b(\chi_{bJ})\to J/\psi
J/\psi\to \ell \bar{\ell}\ell \bar{\ell}$ events produced at the {\tt LHC},
thus it might be hopeful to search for these processes. On the other hand,
there are less than $100$ $\eta_b(\chi_{bJ})\to J/\psi J/\psi$ signal events at
the B factory, so it seems the experimental measurements on these channels are
quite challenging based on current dataset.
|
[
{
"created": "Wed, 11 Oct 2023 12:59:41 GMT",
"version": "v1"
},
{
"created": "Thu, 12 Oct 2023 08:10:40 GMT",
"version": "v2"
}
] |
2023-10-13
|
[
[
"Zhang",
"Yu-Dong",
""
],
[
"Bai",
"Xiao-Wei",
""
],
[
"Feng",
"Feng",
""
],
[
"Sang",
"Wen-Long",
""
],
[
"Zhou",
"Ming-Zhen",
""
]
] |
In the framework of nonrelativistic QCD (NRQCD) factorization, we compute both the polarized and the unpolarized decay widths for the processes $\eta_b(\chi_{bJ})\to J/\psi J/\psi$, accurate up to next-to-next-to-leading-order (NNLO) in $\alpha_s$. For the first time, we confirm that the NRQCD factorization does hold at NNLO for the process involving triple quarkonia. We find the radiative corrections are considerable. In particular for $\chi_{b2}$, both $\mathcal{O}(\alpha_s)$ and $\mathcal{O}(\alpha_s^2)$ corrections are sizable and negative, and can significantly reduce the leading order prediction. At NNLO, the branching fractions are $8.2\times 10^{-7}$, $6.2\times 10^{-6}$, $7.2\times 10^{-7}$ and $2.7\times 10^{-6}$ for $\eta_b$, $\chi_{b0}$, $\chi_{b1}$ and $\chi_{b2}$ decay, respectively. Our theoretical predictions are consistent with the upper limits measured by the {\tt Belle} Collaboration. Moreover, we investigate the dependence of the theoretical predictions on the ratio of the charm quark mass and the bottom quark mass. By fixing $m_b$ and varying $m_c$ from $1.25$ to $1.9$ GeV, we find the branching fraction can change a factor of $2$, $3$, and $6$ for $\eta_b$, $\chi_{b0}$, and $\chi_{b1}$, respectively. In the phenomenological analysis, with the integrate luminosity $\mathcal{L}=100\,{\rm fb}^{-1}$, we expect about $(5-10)\times 10^3$ $\eta_b(\chi_{bJ})\to J/\psi J/\psi\to \ell \bar{\ell}\ell \bar{\ell}$ events produced at the {\tt LHC}, thus it might be hopeful to search for these processes. On the other hand, there are less than $100$ $\eta_b(\chi_{bJ})\to J/\psi J/\psi$ signal events at the B factory, so it seems the experimental measurements on these channels are quite challenging based on current dataset.
|
1409.3227
|
Jiang-Hao Yu
|
Jiang-Hao Yu (Univ. of Texas at Austin)
|
Vector Fermion-Portal Dark Matter: Direct Detection and Galactic Center
Gamma-Ray Excess
|
18 pages, 14 figures, references updated in revised version
|
Phys. Rev. D 90, 095010 (2014)
|
10.1103/PhysRevD.90.095010
|
UTTG-19-14, TCC-021-14
|
hep-ph astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate a neutral gauge boson X originated from a hidden U(1)
extension of the standard model as the particle dark matter candidate. The
vector dark matter interacts with the standard model fermions through heavy
fermion mediators. The interactions give rise to t-channel annihilation cross
section in the XX to ff process, which dominates the thermal relic abundance
during thermal freeze-out and produces measurable gamma-ray flux in the
galactic halo. For a light vector dark matter, if it predominantly couples to
the third generation fermions, this model could explain the excess of gamma
rays from the galactic center. We show that the vector dark matter with a mass
of 20 ~ 40 GeV and that annihilate into the bb and tautau final states provides
an excellent description of the observed gamma-ray excess. The parameter space
aimed at explaining the gamma-ray excess, could also provide the correct
thermal relic density and is compatible with the constraints from electroweak
precision data, Higgs invisible decay, and collider searches. We also show the
dark matter couplings to the nucleon from the fermion portal interactions are
loop-suppressed, and only contribute to the spin-dependent cross section. So
the vector dark matter could easily escape the stringent constraints from the
direct detection experiments.
|
[
{
"created": "Wed, 10 Sep 2014 20:00:14 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Sep 2014 22:26:13 GMT",
"version": "v2"
}
] |
2014-11-19
|
[
[
"Yu",
"Jiang-Hao",
"",
"Univ. of Texas at Austin"
]
] |
We investigate a neutral gauge boson X originated from a hidden U(1) extension of the standard model as the particle dark matter candidate. The vector dark matter interacts with the standard model fermions through heavy fermion mediators. The interactions give rise to t-channel annihilation cross section in the XX to ff process, which dominates the thermal relic abundance during thermal freeze-out and produces measurable gamma-ray flux in the galactic halo. For a light vector dark matter, if it predominantly couples to the third generation fermions, this model could explain the excess of gamma rays from the galactic center. We show that the vector dark matter with a mass of 20 ~ 40 GeV and that annihilate into the bb and tautau final states provides an excellent description of the observed gamma-ray excess. The parameter space aimed at explaining the gamma-ray excess, could also provide the correct thermal relic density and is compatible with the constraints from electroweak precision data, Higgs invisible decay, and collider searches. We also show the dark matter couplings to the nucleon from the fermion portal interactions are loop-suppressed, and only contribute to the spin-dependent cross section. So the vector dark matter could easily escape the stringent constraints from the direct detection experiments.
|
1212.3591
|
Yu Jia
|
Jia Xu, Hai-Rong Dong, Feng Feng, Ying-Jia Gao, Yu Jia
|
Exclusive decay of $\Upsilon$ into $J/\psi+\chi_{c0,1,2}$
|
22 pages, 9 figures, 3 tables
| null |
10.1103/PhysRevD.87.094004
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the $\Upsilon$ exclusive decay into double charmonium, specifically,
the $S$-wave charmonium $ J/\psi$ plus the $P$-wave charmonium $\chi_{c0,1,2}$
in the NRQCD factorization framework. Three distinct decay mechanisms, i.e.,
the strong, electromagnetic and radiative decay channels are included and their
interference effects are investigated. The decay processes
$\Upsilon(1S,2S,3S)\to J/\psi+\chi_{c1,0}$ are predicted to have the branching
fractions of order $10^{-6}$, which should be observed in the prospective Super
$B$ factory.
|
[
{
"created": "Fri, 14 Dec 2012 20:39:51 GMT",
"version": "v1"
}
] |
2013-05-15
|
[
[
"Xu",
"Jia",
""
],
[
"Dong",
"Hai-Rong",
""
],
[
"Feng",
"Feng",
""
],
[
"Gao",
"Ying-Jia",
""
],
[
"Jia",
"Yu",
""
]
] |
We study the $\Upsilon$ exclusive decay into double charmonium, specifically, the $S$-wave charmonium $ J/\psi$ plus the $P$-wave charmonium $\chi_{c0,1,2}$ in the NRQCD factorization framework. Three distinct decay mechanisms, i.e., the strong, electromagnetic and radiative decay channels are included and their interference effects are investigated. The decay processes $\Upsilon(1S,2S,3S)\to J/\psi+\chi_{c1,0}$ are predicted to have the branching fractions of order $10^{-6}$, which should be observed in the prospective Super $B$ factory.
|
hep-ph/9703236
|
Toshiyuki Morii
|
N. I. Kochelev, T. Morii and T. Yamanishi
|
Semi-inclusive Lambda_c^+ Leptoproductions and Polarized Gluon
Distributions
|
9 pages + 4 Postscript figures(2 PS files), LaTeX
|
Phys.Lett. B405 (1997) 168-172
|
10.1016/S0370-2693(97)00593-5
|
KOBE-FHD-97-01
|
hep-ph
| null |
In order to extract the behavior and magnitude of the spin-dependent gluon
distribution, we propose a semi-inclusive $\Lambda_c^+$ production using
unpolarized lepton beams and polarized proton targets. The correlation between
the target proton spin and the spin of $\Lambda_c^+$ produced in the target
fragmentation region might be very effective for testing various models of
polarized gluons.
|
[
{
"created": "Wed, 5 Mar 1997 07:05:01 GMT",
"version": "v1"
}
] |
2009-10-30
|
[
[
"Kochelev",
"N. I.",
""
],
[
"Morii",
"T.",
""
],
[
"Yamanishi",
"T.",
""
]
] |
In order to extract the behavior and magnitude of the spin-dependent gluon distribution, we propose a semi-inclusive $\Lambda_c^+$ production using unpolarized lepton beams and polarized proton targets. The correlation between the target proton spin and the spin of $\Lambda_c^+$ produced in the target fragmentation region might be very effective for testing various models of polarized gluons.
|
1602.02035
|
Alberto Accardi
|
Alberto Accardi
|
PDFs from nucleons to nuclei
|
Pleanary talk delivered at DIS 2015, Dallas, TX (USA), 27 April - May
1 2015
|
PoS DIS2015 (2015) 001
| null |
JLAB-THY-15-2215
|
hep-ph hep-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
I review recent progress in the extraction of unpolarized parton
distributions in the proton and in nuclei from a unified point of view that
highlights how the interplay between high energy particle physics and lower
energy nuclear physics can be of mutual benefit to either field. Areas of
overlap range from the search for physics beyond the standard model at the LHC,
to the study of the non perturbative structure of nucleons and the emergence of
nuclei from quark and gluon degrees of freedom, to the interaction of colored
probes in a cold nuclear medium.
|
[
{
"created": "Fri, 5 Feb 2016 14:24:40 GMT",
"version": "v1"
}
] |
2016-02-10
|
[
[
"Accardi",
"Alberto",
""
]
] |
I review recent progress in the extraction of unpolarized parton distributions in the proton and in nuclei from a unified point of view that highlights how the interplay between high energy particle physics and lower energy nuclear physics can be of mutual benefit to either field. Areas of overlap range from the search for physics beyond the standard model at the LHC, to the study of the non perturbative structure of nucleons and the emergence of nuclei from quark and gluon degrees of freedom, to the interaction of colored probes in a cold nuclear medium.
|
hep-ph/9511239
|
Smirnov A. Y.
|
A. Yu. Smirnov
|
Neutrinos and Structure of the Intermediate Mass Scale
|
19 pages, LaTeX, no figures
|
Nucl.Phys. B466 (1996) 25-40
|
10.1016/0550-3213(96)00084-3
|
YITP-95-6
|
hep-ph
| null |
Neutrino data lead via the see-saw mechanism to masses of the right handed
neutrinos at the intermediate mass scale. Simple formalism is suggested which
incorporates the quark - lepton symmetry and allows one to find properties of
the intermediate scale (masses and mixing) from neutrino data. Averaged mass
scale and the mass hierarchy parameter are introduced and fixed by the data.
They determine natural ranges of masses and mixing at the intermediate scale.
In particular, scenario which includes the MSW solution of the solar neutrino
problem and tau neutrino as the hot component of Dark Matter of the Universe
leads to $M_2 = (2 - 4) \cdot 10^{10}$ GeV and $M_3 = (4 - 8) \cdot 10^{12}$
GeV in agreement with the linear mass hierarchy. Strong deviations from the
natural ranges imply fine tuning of parameters or/and certain symmetry of the
Majorana mass matrix of the right handed neutrinos.
|
[
{
"created": "Sun, 5 Nov 1995 06:38:30 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Smirnov",
"A. Yu.",
""
]
] |
Neutrino data lead via the see-saw mechanism to masses of the right handed neutrinos at the intermediate mass scale. Simple formalism is suggested which incorporates the quark - lepton symmetry and allows one to find properties of the intermediate scale (masses and mixing) from neutrino data. Averaged mass scale and the mass hierarchy parameter are introduced and fixed by the data. They determine natural ranges of masses and mixing at the intermediate scale. In particular, scenario which includes the MSW solution of the solar neutrino problem and tau neutrino as the hot component of Dark Matter of the Universe leads to $M_2 = (2 - 4) \cdot 10^{10}$ GeV and $M_3 = (4 - 8) \cdot 10^{12}$ GeV in agreement with the linear mass hierarchy. Strong deviations from the natural ranges imply fine tuning of parameters or/and certain symmetry of the Majorana mass matrix of the right handed neutrinos.
|
1401.6323
|
Long-Bin Chen
|
Long-Bin Chen and Cong-Feng Qiao
|
NLO corrections to $\chi_{bJ}$ to two-$J/\psi$ exclusive decay processes
|
To appear in PRD
|
Phys. Rev. D 89, 074004 (2014)
|
10.1103/PhysRevD.89.074004
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The next-to-leading order QCD corrections for $\chi_{bJ}$, the p-wave
bottomonium, to $J/\psi$ pair decay processes are evaluated utilizing NRQCD
factorization formalism. The scale dependence of $\chi_{b2}\rightarrow J/\psi
J/\psi$ process is depressed with NLO corrections, and hence the uncertainties
in the leading order results are greatly reduced. The total branch ratios are
found to be the order of $10^{-5}$ for all three $\chi_{bJ}\rightarrow J/\psi
J/\psi$ processes, indicating that they are observable in the LHC and super-B
experiments.
|
[
{
"created": "Fri, 24 Jan 2014 12:05:02 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Mar 2014 01:25:28 GMT",
"version": "v2"
}
] |
2014-04-23
|
[
[
"Chen",
"Long-Bin",
""
],
[
"Qiao",
"Cong-Feng",
""
]
] |
The next-to-leading order QCD corrections for $\chi_{bJ}$, the p-wave bottomonium, to $J/\psi$ pair decay processes are evaluated utilizing NRQCD factorization formalism. The scale dependence of $\chi_{b2}\rightarrow J/\psi J/\psi$ process is depressed with NLO corrections, and hence the uncertainties in the leading order results are greatly reduced. The total branch ratios are found to be the order of $10^{-5}$ for all three $\chi_{bJ}\rightarrow J/\psi J/\psi$ processes, indicating that they are observable in the LHC and super-B experiments.
|
1805.03286
|
Jorgivan Dias Ph.D.
|
J. M. Dias, V. R. Debastiani, J.-Jun Xie, E. Oset
|
Doubly charmed $\Xi_{cc}$ molecular states from meson-baryon interaction
|
22 pages, 2 figures
|
Phys. Rev. D 98, 094017 (2018)
|
10.1103/PhysRevD.98.094017
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Stimulated by the new experimental LHCb findings associated with the
$\Omega_c$ states, some of which we have described in a previous work as being
dynamically generated through meson-baryon interaction, we have extended this
approach to make predictions for new $\Xi_{cc}$ molecular states in the $C=2$,
$S=0$ and $I=1/2$ sector. These states manifest themselves as poles in the
solution of the Bethe-Salpeter equation in coupled channels. The kernels of
this equation were obtained using the Lagrangians coming from the hidden local
gauge symmetry, where the interactions are dominated by the exchange of light
vector mesons. The extension of this approach to the heavy sector stems from
the realization that the dominant interaction corresponds to having the heavy
quarks as spectators, which implies the preservation of the heavy quark
symmetry. As a result, we get several states: two states from the pseudoscalar
meson-baryon interaction with $J^P=1/2^-$, and masses around $4080$ and $4090$
MeV, and one at $4150$ MeV for $J^P=3/2^-$. Furthermore, from the vector
meson-baryon interaction we get three states degenerate with $J^P=1/2^-$ and
$3/2^-$ from $4220$ MeV to $4330$ MeV, and two more states around $4280$ MeV
and $4410$ MeV, degenerate with $J^P=1/2^-,\, 3/2^-$ and $5/2^-$.
|
[
{
"created": "Tue, 8 May 2018 21:03:05 GMT",
"version": "v1"
}
] |
2018-11-28
|
[
[
"Dias",
"J. M.",
""
],
[
"Debastiani",
"V. R.",
""
],
[
"Xie",
"J. -Jun",
""
],
[
"Oset",
"E.",
""
]
] |
Stimulated by the new experimental LHCb findings associated with the $\Omega_c$ states, some of which we have described in a previous work as being dynamically generated through meson-baryon interaction, we have extended this approach to make predictions for new $\Xi_{cc}$ molecular states in the $C=2$, $S=0$ and $I=1/2$ sector. These states manifest themselves as poles in the solution of the Bethe-Salpeter equation in coupled channels. The kernels of this equation were obtained using the Lagrangians coming from the hidden local gauge symmetry, where the interactions are dominated by the exchange of light vector mesons. The extension of this approach to the heavy sector stems from the realization that the dominant interaction corresponds to having the heavy quarks as spectators, which implies the preservation of the heavy quark symmetry. As a result, we get several states: two states from the pseudoscalar meson-baryon interaction with $J^P=1/2^-$, and masses around $4080$ and $4090$ MeV, and one at $4150$ MeV for $J^P=3/2^-$. Furthermore, from the vector meson-baryon interaction we get three states degenerate with $J^P=1/2^-$ and $3/2^-$ from $4220$ MeV to $4330$ MeV, and two more states around $4280$ MeV and $4410$ MeV, degenerate with $J^P=1/2^-,\, 3/2^-$ and $5/2^-$.
|
1105.5935
|
Jialun Ping
|
Youchang Yang, Jialun Ping, Chengrong Deng and Hong-Shi Zong
|
Possible interpretation of the $Z_b$(10610) and $Z_b$(10650) in a chiral
quark model
|
13 pages, 1 figure, title and some arguments in the abstract and
section 5 are revised, results unchanged
| null |
10.1088/0954-3899/39/10/105001
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Motivated by the two charged bottomonium-like resonances $Z_b$(10610) and
$Z_b$(10650) newly observed by the Belle collaboration, the possible molecular
states composed of a pair of heavy mesons, $B\bar{B}, B\bar{B}^*, B^*\bar{B}^*,
B_s\bar{B}$, etc (in S-wave), are investigated in the framework of chiral quark
models by the Gaussian expansion method. The bound states $B\bar{B}^*$ and
$B^*\bar{B}^*$ with quantum numbers $I(J^{PC})=1(1^{+-})$, which are good
candidates for the $Z_b(10610)$ and $Z_b(10650)$ respectively, are obtained.
Other three bound states $B\bar{B}^*$ with $I(J^{PC})=0(1^{++})$,
$B^*\bar{B}^*$ with $I(J^{PC})=1(0^{++}), 0(2^{++})$ are predicted. These
states may be observed in open-bottom or hidden-bottom decay channel of highly
excited $\Upsilon$. When extending directly the quark model to the hidden color
channel of the multi-quark system, more deeply bound states are found. Future
experimental search of those states will cast doubt on the validity of applying
the chiral constituent quark model to the hidden color channel directly.
|
[
{
"created": "Mon, 30 May 2011 10:29:30 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Jun 2011 03:14:20 GMT",
"version": "v2"
},
{
"created": "Thu, 19 Jul 2012 01:55:42 GMT",
"version": "v3"
}
] |
2015-05-28
|
[
[
"Yang",
"Youchang",
""
],
[
"Ping",
"Jialun",
""
],
[
"Deng",
"Chengrong",
""
],
[
"Zong",
"Hong-Shi",
""
]
] |
Motivated by the two charged bottomonium-like resonances $Z_b$(10610) and $Z_b$(10650) newly observed by the Belle collaboration, the possible molecular states composed of a pair of heavy mesons, $B\bar{B}, B\bar{B}^*, B^*\bar{B}^*, B_s\bar{B}$, etc (in S-wave), are investigated in the framework of chiral quark models by the Gaussian expansion method. The bound states $B\bar{B}^*$ and $B^*\bar{B}^*$ with quantum numbers $I(J^{PC})=1(1^{+-})$, which are good candidates for the $Z_b(10610)$ and $Z_b(10650)$ respectively, are obtained. Other three bound states $B\bar{B}^*$ with $I(J^{PC})=0(1^{++})$, $B^*\bar{B}^*$ with $I(J^{PC})=1(0^{++}), 0(2^{++})$ are predicted. These states may be observed in open-bottom or hidden-bottom decay channel of highly excited $\Upsilon$. When extending directly the quark model to the hidden color channel of the multi-quark system, more deeply bound states are found. Future experimental search of those states will cast doubt on the validity of applying the chiral constituent quark model to the hidden color channel directly.
|
hep-ph/9405303
| null |
H. Holtmann, N.N. Nikolaev, J. Speth and A. Szczurek
|
Pion Content of the Nucleon as seen in the NA51 Drell-Yan experiment
|
10 pages + 3 figures, Preprint KFA-IKP(TH)-1994-14 .tex file. After
\enddocument a uu-encodeded Postscript file comprising the figures is
appended
|
Z.Phys.A353:411-414,1996
|
10.1007/BF01285152
| null |
hep-ph
| null |
In a recent CERN Drell-Yan experiment the NA51 group found a strong asymmetry
of $\bar u$ and $\bar d$ densities in the proton at $x\simeq0.18$. We interpret
this result as a decisive confirmation of the pion-induced sea in the nucleon.
|
[
{
"created": "Mon, 16 May 1994 13:31:33 GMT",
"version": "v1"
}
] |
2011-02-01
|
[
[
"Holtmann",
"H.",
""
],
[
"Nikolaev",
"N. N.",
""
],
[
"Speth",
"J.",
""
],
[
"Szczurek",
"A.",
""
]
] |
In a recent CERN Drell-Yan experiment the NA51 group found a strong asymmetry of $\bar u$ and $\bar d$ densities in the proton at $x\simeq0.18$. We interpret this result as a decisive confirmation of the pion-induced sea in the nucleon.
|
hep-ph/0511335
|
Stephen Godfrey
|
Stephen Godfrey, Pat Kalyniak, Alexander Tomkins (Carleton U)
|
Distinguishing Between Models with Extra Gauge Bosons at the ILC
|
Presented at the 2005 International Linear Collider Physics and
Detector Workshop and Second ILC Accelerator Workshop, Snowmass, CO
(Snowmass05), 5 pages, LaTeX, 6 postscript figures
| null | null |
ALCPG0108
|
hep-ph
| null |
Extra neutral gauge bosons arise in many extensions of the Standard Model. If
one were to be discovered it would be necessary to measure its properties so
that we could understand its origins. In this report we find that Z' couplings
can be measured at the ILC precisely enough to distinguish between models up to
a Z' mass of 2-3 TeV. An important ingredient in these measurements is
polarization of the e^- and to a lesser extent e^+ beams. b and c-quark tagging
would also give important additional information.
|
[
{
"created": "Tue, 29 Nov 2005 22:01:34 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Godfrey",
"Stephen",
"",
"Carleton U"
],
[
"Kalyniak",
"Pat",
"",
"Carleton U"
],
[
"Tomkins",
"Alexander",
"",
"Carleton U"
]
] |
Extra neutral gauge bosons arise in many extensions of the Standard Model. If one were to be discovered it would be necessary to measure its properties so that we could understand its origins. In this report we find that Z' couplings can be measured at the ILC precisely enough to distinguish between models up to a Z' mass of 2-3 TeV. An important ingredient in these measurements is polarization of the e^- and to a lesser extent e^+ beams. b and c-quark tagging would also give important additional information.
|
1708.08515
|
Leandro Da Rold
|
Leandro Da Rold
|
Anarchy with linear and bilinear interactions
|
26 pages
| null |
10.1007/JHEP10(2017)120
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Composite Higgs models with anarchic partial compositeness require a scale of
new physics ${\cal O}(10-100)$ TeV, with the bounds being dominated by the
dipole moments and $\epsilon_K$. The presence of anarchic bilinear interactions
can change this picture. We show a solution to the SM flavor puzzle where the
electron and the Right-handed quarks of the first generation have negligible
linear interactions, and the bilinear interactions account for most of their
masses, whereas the other chiral fermions follow a similar pattern to anarchic
partial compositeness. We compute the bounds from flavor and CP violation and
show that neutron and electron dipole moments, as well as $\epsilon_K$ and
$\mu\to e\gamma$, are compatible with a new physics scale below the TeV.
$\Delta F=2$ operators involving Left-handed quarks and $\Delta F=1$ operators
with $d_L$ give the most stringent bounds in this scenario. Their Wilson
coefficients have the same origin as in anarchic partial compositeness,
requiring the masses of the new states to be larger than ${\cal O}(6-7)$ TeV.
|
[
{
"created": "Mon, 28 Aug 2017 20:37:53 GMT",
"version": "v1"
}
] |
2017-11-22
|
[
[
"Da Rold",
"Leandro",
""
]
] |
Composite Higgs models with anarchic partial compositeness require a scale of new physics ${\cal O}(10-100)$ TeV, with the bounds being dominated by the dipole moments and $\epsilon_K$. The presence of anarchic bilinear interactions can change this picture. We show a solution to the SM flavor puzzle where the electron and the Right-handed quarks of the first generation have negligible linear interactions, and the bilinear interactions account for most of their masses, whereas the other chiral fermions follow a similar pattern to anarchic partial compositeness. We compute the bounds from flavor and CP violation and show that neutron and electron dipole moments, as well as $\epsilon_K$ and $\mu\to e\gamma$, are compatible with a new physics scale below the TeV. $\Delta F=2$ operators involving Left-handed quarks and $\Delta F=1$ operators with $d_L$ give the most stringent bounds in this scenario. Their Wilson coefficients have the same origin as in anarchic partial compositeness, requiring the masses of the new states to be larger than ${\cal O}(6-7)$ TeV.
|
hep-ph/9507252
|
Biswarup Mukhopadhyaya
|
Rathin Adhikari and Biswarup Mukhopadhyaya
|
Tau-Universality Violation with Light Neutralinos
|
11 pages, LATEX, 3 figures (hard copies of figures available from the
Authors on request)
|
Phys.Rev. D53 (1996) 1425-1428
|
10.1103/PhysRevD.53.1425
|
MRI-PHY/6/95
|
hep-ph
| null |
In a supersymmetric model with the lightest supersymmetric particle (LSP)
$\chi$ in the range of a few hundred MeV's, the decay $\tau {\longrightarrow}
\mu \chi \chi$ is going to be allowed. We investigate the departure from
tau-universality caused by this decay. It is found that the universality
violation in this way can be greater than both non-universal electroweak
radiative corrections and supersymmetric one-loop corrections over a
considerable region of the parameter space allowed by experiments so far. Thus
it suggests a method of constraining the parameter space with light LSP's using
data from tau-factories.
|
[
{
"created": "Thu, 6 Jul 1995 07:35:09 GMT",
"version": "v1"
},
{
"created": "Sat, 15 Jul 1995 07:12:13 GMT",
"version": "v2"
}
] |
2009-10-28
|
[
[
"Adhikari",
"Rathin",
""
],
[
"Mukhopadhyaya",
"Biswarup",
""
]
] |
In a supersymmetric model with the lightest supersymmetric particle (LSP) $\chi$ in the range of a few hundred MeV's, the decay $\tau {\longrightarrow} \mu \chi \chi$ is going to be allowed. We investigate the departure from tau-universality caused by this decay. It is found that the universality violation in this way can be greater than both non-universal electroweak radiative corrections and supersymmetric one-loop corrections over a considerable region of the parameter space allowed by experiments so far. Thus it suggests a method of constraining the parameter space with light LSP's using data from tau-factories.
|
hep-ph/9911215
|
Singer Paul
|
Paul Singer
|
Rare Decays of Heavy Quarks - Searching Ground for New Physics
|
Presented at the XXXIX Cracow School of Theoretical Physics, May
29-June 8, 1999, Zakopane, Poland
|
Acta Phys.Polon.B30:3861-3873,1999
| null | null |
hep-ph
| null |
The search for new physics beyond the standard model is proceeding nowadays
intensively along experimental and theoretical lines. We review here the sector
of charm radiative decays in this context. The calculation of $D\to V\gamma$,
$D\to \ell^+\ell^-\gamma$ transitions reveals their unequivocal dominance by
long-distance contributions. On the other hand, the beauty-conserving
charm-changing electroweak transition $B_c\to B_u^*\gamma$ is shown to have
unique properties which make it a promising avenue in the search for new
physics. We describe a calculation of short- and long-distance contributions to
this decay which finds them to be of comparable size. The branching ratio of
this decay in the standard model is estimated to be $\simeq 10^{-8}$.
|
[
{
"created": "Wed, 3 Nov 1999 10:49:40 GMT",
"version": "v1"
}
] |
2011-01-25
|
[
[
"Singer",
"Paul",
""
]
] |
The search for new physics beyond the standard model is proceeding nowadays intensively along experimental and theoretical lines. We review here the sector of charm radiative decays in this context. The calculation of $D\to V\gamma$, $D\to \ell^+\ell^-\gamma$ transitions reveals their unequivocal dominance by long-distance contributions. On the other hand, the beauty-conserving charm-changing electroweak transition $B_c\to B_u^*\gamma$ is shown to have unique properties which make it a promising avenue in the search for new physics. We describe a calculation of short- and long-distance contributions to this decay which finds them to be of comparable size. The branching ratio of this decay in the standard model is estimated to be $\simeq 10^{-8}$.
|
0808.3500
|
Federico Urban
|
Cosimo Bambi, Federico R. Urban
|
Gravitational production of KK states
|
10 pages, 1 figure
|
Phys.Rev.D78:103515,2008
|
10.1103/PhysRevD.78.103515
|
WSU-HEP-0810
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Gravitational particle production in the context of braneworlds is considered
from a phenomenological point of view. The production of KK modes for bulk
fields is discussed and their abundances computed. The results have been
applied to some specific fields such as gravitinos and axions, and their
cosmologies have been outlined, exemplifying the constraints on the properties
of the extra dimensional model in each case.
|
[
{
"created": "Tue, 26 Aug 2008 12:44:48 GMT",
"version": "v1"
}
] |
2009-02-23
|
[
[
"Bambi",
"Cosimo",
""
],
[
"Urban",
"Federico R.",
""
]
] |
Gravitational particle production in the context of braneworlds is considered from a phenomenological point of view. The production of KK modes for bulk fields is discussed and their abundances computed. The results have been applied to some specific fields such as gravitinos and axions, and their cosmologies have been outlined, exemplifying the constraints on the properties of the extra dimensional model in each case.
|
1311.2077
|
Juan Ignacio Sanchez Vietto
|
Ezequiel Alvarez, Leandro Da Rold and Juan Ignacio Sanchez Vietto
|
Single production of an exotic bottom partner at LHC
|
27 pages, 9 figures
| null |
10.1007/JHEP02(2014)010
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study single production and detection at the LHC run II of exotic partners
of the bottom quark. For masses larger than 1 TeV single production can
dominate over pair production that is suppressed due to phase space. The
presence of exotic partners of the bottom is motivated in models aiming to
solve the $A_{FB}^b$ anomaly measured at LEP and SLC. Minimal models of this
type with partial compositeness predict, as the lightest bottom partner, a new
fermion V of electric charge -4/3, also called mirror. The relevant coupling
for our study is a WVb vertex, which yields a signal that corresponds to a hard
W, a hard b-jet and a forward light jet. We design a search strategy for the
leptonic decay of the W, which avoids the large QCD multijet background and its
large uncertainties. We find that the main backgrounds are W+jets and ttbar,
and the key variables to enhance the signal over them are a hard b-jet and the
rapidity of the light jet. We determine the discovery reach for the LHC run II,
in particular we predict that, for couplings of order ~g/10, this signal could
be detected at a 95% confidence level with a mass up to 2.4 TeV using the first
100 fb-1.
|
[
{
"created": "Fri, 8 Nov 2013 21:00:11 GMT",
"version": "v1"
}
] |
2015-06-17
|
[
[
"Alvarez",
"Ezequiel",
""
],
[
"Da Rold",
"Leandro",
""
],
[
"Vietto",
"Juan Ignacio Sanchez",
""
]
] |
We study single production and detection at the LHC run II of exotic partners of the bottom quark. For masses larger than 1 TeV single production can dominate over pair production that is suppressed due to phase space. The presence of exotic partners of the bottom is motivated in models aiming to solve the $A_{FB}^b$ anomaly measured at LEP and SLC. Minimal models of this type with partial compositeness predict, as the lightest bottom partner, a new fermion V of electric charge -4/3, also called mirror. The relevant coupling for our study is a WVb vertex, which yields a signal that corresponds to a hard W, a hard b-jet and a forward light jet. We design a search strategy for the leptonic decay of the W, which avoids the large QCD multijet background and its large uncertainties. We find that the main backgrounds are W+jets and ttbar, and the key variables to enhance the signal over them are a hard b-jet and the rapidity of the light jet. We determine the discovery reach for the LHC run II, in particular we predict that, for couplings of order ~g/10, this signal could be detected at a 95% confidence level with a mass up to 2.4 TeV using the first 100 fb-1.
|
hep-ph/9507364
| null |
I.I. Bigi
|
Lifetimes of Heavy-Flavour Hadrons -- Whence and Whither?
|
15 pages, no figures, LATEX, two references added and new information
concerning a lower charm content in B decays incorporated
|
Nuovo Cim.A109:713-726,1996
|
10.1007/BF02731705
|
UND-HEP-95-BIG06
|
hep-ph
| null |
A theoretical treatment for the weak decays of heavy-flavour hadrons has been
developed that is genuinely based on QCD. Its methodology as it applies to
total lifetimes and the underlying theoretical issues are sketched. Predictions
are compared with present data. One discrepancy emerges: the beauty baryon
lifetime appears to be significantly shorter than expected. The ramifications
of those findings are analyzed in detail.
|
[
{
"created": "Fri, 21 Jul 1995 06:30:09 GMT",
"version": "v1"
},
{
"created": "Thu, 27 Jul 1995 06:19:51 GMT",
"version": "v2"
}
] |
2010-11-11
|
[
[
"Bigi",
"I. I.",
""
]
] |
A theoretical treatment for the weak decays of heavy-flavour hadrons has been developed that is genuinely based on QCD. Its methodology as it applies to total lifetimes and the underlying theoretical issues are sketched. Predictions are compared with present data. One discrepancy emerges: the beauty baryon lifetime appears to be significantly shorter than expected. The ramifications of those findings are analyzed in detail.
|
hep-ph/9508294
| null |
I.I. Bigi
|
Quo Vadis, Fascinum?
|
13 pages, LATEX, Invited Lecture given at the Workshop on the
Tau/Charm Factory, Argonne National Laboratory, June 21 - 23, 1995
|
AIP Conf.Proc.349:331-344,1996
|
10.1063/1.49269
|
UND-HEP-95-BIG08
|
hep-ph
| null |
The recent progress in our understanding of heavy-flavour decays allows us to
define more reliably which future measurements on charm decays are needed to
further advance our understanding of QCD and to get our theoretical tools ready
for treating beauty decays. After sketching the theoretical landscape I list
those required measurements. I argue that some -- in particular those
concerning inclusive semileptonic charm decays and their lepton spectra -- can
presumably be performed only at a tau-charm factory.
|
[
{
"created": "Mon, 14 Aug 1995 21:43:12 GMT",
"version": "v1"
}
] |
2015-06-25
|
[
[
"Bigi",
"I. I.",
""
]
] |
The recent progress in our understanding of heavy-flavour decays allows us to define more reliably which future measurements on charm decays are needed to further advance our understanding of QCD and to get our theoretical tools ready for treating beauty decays. After sketching the theoretical landscape I list those required measurements. I argue that some -- in particular those concerning inclusive semileptonic charm decays and their lepton spectra -- can presumably be performed only at a tau-charm factory.
|
hep-ph/9210257
| null |
L. Clavelli
|
Tau Decay Puzzles and Possible Light Gluinos
|
10 pp, conference talk, 2 tables included, 1 figure not incl.
| null | null |
UAHEP216
|
hep-ph
| null |
The relation of the strong coupling constant as measured in tau decay to
other low energy determinations is considered with special attention to its
impact on the question of the possible existence of light gluinos.
|
[
{
"created": "Thu, 22 Oct 1992 15:05:15 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Clavelli",
"L.",
""
]
] |
The relation of the strong coupling constant as measured in tau decay to other low energy determinations is considered with special attention to its impact on the question of the possible existence of light gluinos.
|
1908.11155
|
Rusa Mandal
|
Rusa Mandal and Antonio Pich
|
Constraints on scalar leptoquarks from lepton and kaon physics
|
Bounds updated with the most recent experimental information from
Kaon 2019. Additional references included
|
JHEP 1912 (2019) 089
|
10.1007/JHEP12(2019)089
|
IFIC/19-32
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a comprehensive analysis of low-energy signals of hypothetical
scalar leptoquark interactions in lepton and kaon transitions. We derive the
most general effective four-fermion Lagrangian induced by tree-level scalar
leptoquark exchange and identify the Wilson coefficients predicted by the five
possible types of scalar leptoquarks. The current constraints on the leptoquark
Yukawa couplings arising from lepton and kaon processes are worked out,
including also loop-induced transitions with only leptons (or quarks) as
external states. In the presence of scalar leptoquark interactions, we also
derive the differential distributions for flavour-changing neutral-current
transitions in semileptonic kaon modes, including all known effects within the
Standard Model. Their interference with the new physics contributions could
play a significant role in future improvements of those constraints that are
currently hampered by poorly-determined non-perturbative parameters.
|
[
{
"created": "Thu, 29 Aug 2019 11:22:27 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Oct 2019 09:50:35 GMT",
"version": "v2"
}
] |
2019-12-20
|
[
[
"Mandal",
"Rusa",
""
],
[
"Pich",
"Antonio",
""
]
] |
We present a comprehensive analysis of low-energy signals of hypothetical scalar leptoquark interactions in lepton and kaon transitions. We derive the most general effective four-fermion Lagrangian induced by tree-level scalar leptoquark exchange and identify the Wilson coefficients predicted by the five possible types of scalar leptoquarks. The current constraints on the leptoquark Yukawa couplings arising from lepton and kaon processes are worked out, including also loop-induced transitions with only leptons (or quarks) as external states. In the presence of scalar leptoquark interactions, we also derive the differential distributions for flavour-changing neutral-current transitions in semileptonic kaon modes, including all known effects within the Standard Model. Their interference with the new physics contributions could play a significant role in future improvements of those constraints that are currently hampered by poorly-determined non-perturbative parameters.
|
2304.09255
|
Andreas Ekstedt
|
Andreas Ekstedt
|
Propagation of gauge fields in hot and dense plasmas at higher orders
|
21 pages, 4 figures
| null | null | null |
hep-ph nucl-th
|
http://creativecommons.org/licenses/by/4.0/
|
Thermal field theory is indispensable for describing hot and dense systems.
Yet perturbative calculations are often stymied by a host of energy scales, and
tend to converge slowly. This means that precise results require the apt use of
effective field theories. In this paper we refine the effective description of
slowly varying gauge field known as hard thermal loops. We match this effective
theory to the full theory to two-loops. Our results apply for any
renormalizable model and fermion chemical potential. We also discuss how to
consistently define asymptotic masses at higher orders; and how to treat
spectral functions close to the lightcone. In particular, we demonstrate that
the gluon mass is well-defined to next-to-leading order.
|
[
{
"created": "Tue, 18 Apr 2023 19:35:39 GMT",
"version": "v1"
}
] |
2023-04-20
|
[
[
"Ekstedt",
"Andreas",
""
]
] |
Thermal field theory is indispensable for describing hot and dense systems. Yet perturbative calculations are often stymied by a host of energy scales, and tend to converge slowly. This means that precise results require the apt use of effective field theories. In this paper we refine the effective description of slowly varying gauge field known as hard thermal loops. We match this effective theory to the full theory to two-loops. Our results apply for any renormalizable model and fermion chemical potential. We also discuss how to consistently define asymptotic masses at higher orders; and how to treat spectral functions close to the lightcone. In particular, we demonstrate that the gluon mass is well-defined to next-to-leading order.
|
hep-ph/0702280
|
Sarira Sahu
|
Alberto Bravo Garcia and Sarira Sahu
|
Higher order correction to the neutrino self-energy in a medium and its
astrophysical applications
|
10 pages, revtex style, uses axodraw.sty, 1 figure
|
Mod. Phys. Lett. A, 22 (2007) 213-225
|
10.1142/S0217732307020865
| null |
hep-ph
| null |
We have calculated the 1/M^4 (M the vector boson mass) order correction to
the neutrino self-energy in a medium. The possible application of this higher
order contribution to the neutrino effective potential is considered in the
context of the Early Universe hot plasma and of the cosmological Gamma Ray
Burst fireball. We found that, depending on the medium parameters and on the
neutrino properties (mixing angle and mass square difference) the resonant
oscillation of active to active neutrinos is possible.
|
[
{
"created": "Tue, 27 Feb 2007 17:05:34 GMT",
"version": "v1"
}
] |
2009-11-13
|
[
[
"Garcia",
"Alberto Bravo",
""
],
[
"Sahu",
"Sarira",
""
]
] |
We have calculated the 1/M^4 (M the vector boson mass) order correction to the neutrino self-energy in a medium. The possible application of this higher order contribution to the neutrino effective potential is considered in the context of the Early Universe hot plasma and of the cosmological Gamma Ray Burst fireball. We found that, depending on the medium parameters and on the neutrino properties (mixing angle and mass square difference) the resonant oscillation of active to active neutrinos is possible.
|
0709.0422
|
A. V. Luchinsky
|
A. V. Berezhnoy, S. N. Koshkarev, A. V. Luchinsky, V. I. Nikolaenko
|
Lepton pair production in muon scattering by nucleus
|
15 pages, 12 figures, typos corrected
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Coherent production of lepton pair in muon scattering by nucleus is
considered. With the help of different approaches (equivalent photon
approximation, direct numerical and analytical calculations) we obtain total
cross section of this reaction and distributions over invariant masses of final
leptons. Special attention is paid to influence of final lepton identity on
total and differential cross sections. We also study the role of coherence
condition. Total cross sections of charmonia production in muon interaction
with electromagnetic field of nucleus are also presented.
|
[
{
"created": "Tue, 4 Sep 2007 13:06:07 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Sep 2007 11:56:40 GMT",
"version": "v2"
},
{
"created": "Tue, 16 Oct 2007 09:50:23 GMT",
"version": "v3"
},
{
"created": "Wed, 27 Aug 2008 11:33:45 GMT",
"version": "v4"
}
] |
2008-08-27
|
[
[
"Berezhnoy",
"A. V.",
""
],
[
"Koshkarev",
"S. N.",
""
],
[
"Luchinsky",
"A. V.",
""
],
[
"Nikolaenko",
"V. I.",
""
]
] |
Coherent production of lepton pair in muon scattering by nucleus is considered. With the help of different approaches (equivalent photon approximation, direct numerical and analytical calculations) we obtain total cross section of this reaction and distributions over invariant masses of final leptons. Special attention is paid to influence of final lepton identity on total and differential cross sections. We also study the role of coherence condition. Total cross sections of charmonia production in muon interaction with electromagnetic field of nucleus are also presented.
|
2305.07689
|
Sally Dawson
|
Sally Dawson, Duarte Fontes, Carlos Quezada-Calonge, and Juan Jos\'e
Sanz-Cillero
|
Matching the 2HDM to the HEFT and the SMEFT: Decoupling and
Perturbativity
|
The HEFT matching to the 2HDM is contained in the supplemental
material. Version 2 is version to be published in Phys. Rev. D
| null | null |
IPARCOS-UCM-23-034
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider the 2 Higgs Doublet Model (2HDM) and compare two effective field
theory (EFT) approaches to it, according to whether the heavy degrees of
freedom are integrated out before (SMEFT) or after (HEFT) spontaneous symmetry
breaking. %We show that, in the HEFT, an inconsistent EFT is obtained if one
considers an expansion simply in inverse powers of the heavy masses. %We
consider a HEFT expansion consistent with perturbativity %We show that, if the
HEFT approach is required to comply with perturbativity, it ends up obeying the
same power counting as the SMEFT one. % By requiring decoupling and
perturbativity in the 2HDM, we define a consistent EFT expansion in inverse
powers of the heavy masses which is applied to both the SMEFT and the HEFT
matchings to the 2HDM. We organize this expansion with a dimensionless
parameter $\xi$, and investigate the tree-level scatterings $hh\rightarrow hh$
and $WW\rightarrow hh$ up to $\mathcal{O}(\xi^2)$. We find no differences
between the HEFT and the SMEFT approaches at this order. We show scenarios
where even including dimension-8 operators of the SMEFT is insufficient to
obtain an accurate matching to the 2HDM.
|
[
{
"created": "Fri, 12 May 2023 18:00:00 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Sep 2023 13:10:12 GMT",
"version": "v2"
}
] |
2023-09-12
|
[
[
"Dawson",
"Sally",
""
],
[
"Fontes",
"Duarte",
""
],
[
"Quezada-Calonge",
"Carlos",
""
],
[
"Sanz-Cillero",
"Juan José",
""
]
] |
We consider the 2 Higgs Doublet Model (2HDM) and compare two effective field theory (EFT) approaches to it, according to whether the heavy degrees of freedom are integrated out before (SMEFT) or after (HEFT) spontaneous symmetry breaking. %We show that, in the HEFT, an inconsistent EFT is obtained if one considers an expansion simply in inverse powers of the heavy masses. %We consider a HEFT expansion consistent with perturbativity %We show that, if the HEFT approach is required to comply with perturbativity, it ends up obeying the same power counting as the SMEFT one. % By requiring decoupling and perturbativity in the 2HDM, we define a consistent EFT expansion in inverse powers of the heavy masses which is applied to both the SMEFT and the HEFT matchings to the 2HDM. We organize this expansion with a dimensionless parameter $\xi$, and investigate the tree-level scatterings $hh\rightarrow hh$ and $WW\rightarrow hh$ up to $\mathcal{O}(\xi^2)$. We find no differences between the HEFT and the SMEFT approaches at this order. We show scenarios where even including dimension-8 operators of the SMEFT is insufficient to obtain an accurate matching to the 2HDM.
|
2203.13842
|
Dawid Brzeminski
|
Dawid Brzeminski, Anson Hook and Gustavo Marques-Tavares
|
Precision Early Universe Cosmology from Stochastic Gravitational Waves
|
28 pages, 11 figures
| null |
10.1007/JHEP11(2022)061
| null |
hep-ph astro-ph.CO gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The causal tail of stochastic gravitational waves can be used to probe the
energy density in free streaming relativistic species as well as measure
$g_\star(T)$ and beta functions $\beta(T)$ as a function of temperature. In the
event of the discovery of loud stochastic gravitational waves, we demonstrate
that LISA can measure the free streaming fraction of the universe down to the
the $10^{-3}$ level, 100 times more sensitive than current constraints.
Additionally, it would be sensitive to $\mathcal{O}(1)$ deviations of $g_\star$
and the QCD $\beta$ function from their Standard Model value at temperatures
$\sim 10^5$ GeV. In this case, many motivated models such as split SUSY and
other solutions to the Electroweak Hierarchy problem would be tested. Future
detectors, such as DECIGO, would be 100 times more sensitive than LISA to these
effects and be capable of testing other motivated scenarios such as WIMPs and
axions. The amazing prospect of using precision gravitational wave measurements
to test such well motivated theories provides a benchmark to aim for when
developing a precise understanding of the gravitational wave spectrum both
experimentally and theoretically.
|
[
{
"created": "Fri, 25 Mar 2022 18:16:05 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Jun 2022 18:17:59 GMT",
"version": "v2"
},
{
"created": "Wed, 12 Oct 2022 16:56:36 GMT",
"version": "v3"
}
] |
2022-11-30
|
[
[
"Brzeminski",
"Dawid",
""
],
[
"Hook",
"Anson",
""
],
[
"Marques-Tavares",
"Gustavo",
""
]
] |
The causal tail of stochastic gravitational waves can be used to probe the energy density in free streaming relativistic species as well as measure $g_\star(T)$ and beta functions $\beta(T)$ as a function of temperature. In the event of the discovery of loud stochastic gravitational waves, we demonstrate that LISA can measure the free streaming fraction of the universe down to the the $10^{-3}$ level, 100 times more sensitive than current constraints. Additionally, it would be sensitive to $\mathcal{O}(1)$ deviations of $g_\star$ and the QCD $\beta$ function from their Standard Model value at temperatures $\sim 10^5$ GeV. In this case, many motivated models such as split SUSY and other solutions to the Electroweak Hierarchy problem would be tested. Future detectors, such as DECIGO, would be 100 times more sensitive than LISA to these effects and be capable of testing other motivated scenarios such as WIMPs and axions. The amazing prospect of using precision gravitational wave measurements to test such well motivated theories provides a benchmark to aim for when developing a precise understanding of the gravitational wave spectrum both experimentally and theoretically.
|
1004.2444
|
Jialun Ping
|
Youchang Yang and Jialun Ping
|
Dynamical study of the $X$(3915) as a molecular $D^*\bar{D^*}$ state in
a quark model
|
5 pages, 2 figures
|
Phys.Rev.D81:114025,2010
|
10.1103/PhysRevD.81.114025
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Considering the coupling of color $1 \otimes 1$ and $8 \otimes 8$ structures,
we calculate the energy of the newly observed $X$(3915) as $S-$wave
$D^*\bar{D^*}$ state in the Bhaduri, Cohler, and Nogami quark model by the
Gaussian Expansion Method. Due to the color coupling, the bound state of
$D^*\bar{D^*}$ with $J^{PC}=0^{++}$ is found, which is well consonant with the
experimental data of the $X$(3915). The bound state of $B^*\bar{B^*}$ with
$J^{PC}=0^{++}$ and $2^{++}$ are also predicted in this work.
|
[
{
"created": "Wed, 14 Apr 2010 16:35:11 GMT",
"version": "v1"
}
] |
2014-11-20
|
[
[
"Yang",
"Youchang",
""
],
[
"Ping",
"Jialun",
""
]
] |
Considering the coupling of color $1 \otimes 1$ and $8 \otimes 8$ structures, we calculate the energy of the newly observed $X$(3915) as $S-$wave $D^*\bar{D^*}$ state in the Bhaduri, Cohler, and Nogami quark model by the Gaussian Expansion Method. Due to the color coupling, the bound state of $D^*\bar{D^*}$ with $J^{PC}=0^{++}$ is found, which is well consonant with the experimental data of the $X$(3915). The bound state of $B^*\bar{B^*}$ with $J^{PC}=0^{++}$ and $2^{++}$ are also predicted in this work.
|
hep-ph/0012177
|
Cosmin Macesanu
|
Cosmin Macesanu and Lynne H. Orr (University of Rochester)
|
Gluon Radiation in Top Quark Production and Decay at $e^+e^-$ Colliders
|
16 pages, Latex, 10 postscript figures; added some references
|
Phys.Rev.D65:014004,2002
|
10.1103/PhysRevD.65.014004
|
UR-1623
|
hep-ph
| null |
We study gluon radiation in top quark production above threshold at high
energy $e^+e^-$ colliders. We allow for the top quarks to be off-shell,
considering radiation in both the top production and decay processes
simultaneously. Our calculation includes all top width effects, spin
correlations, and $b$ quark mass effects. We study the effects of gluon
radiation on top mass reconstuction and examine the interference between
production- and decay-stage radiation, which can be sensitive to the value of
the top quark decay width.
|
[
{
"created": "Thu, 14 Dec 2000 19:28:16 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Dec 2000 21:17:17 GMT",
"version": "v2"
}
] |
2011-07-19
|
[
[
"Macesanu",
"Cosmin",
"",
"University of Rochester"
],
[
"Orr",
"Lynne H.",
"",
"University of Rochester"
]
] |
We study gluon radiation in top quark production above threshold at high energy $e^+e^-$ colliders. We allow for the top quarks to be off-shell, considering radiation in both the top production and decay processes simultaneously. Our calculation includes all top width effects, spin correlations, and $b$ quark mass effects. We study the effects of gluon radiation on top mass reconstuction and examine the interference between production- and decay-stage radiation, which can be sensitive to the value of the top quark decay width.
|
2404.06520
|
Buyao Qu
|
Gui-Jun Ding, Si-Yi Jiang, Stephen F. King, Jun-Nan Lu, Bu-Yao Qu
|
Pati-Salam models with $A_4$ modular symmetry
|
33 pages, 10 figures
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The flavor structure of quarks and leptons and quark-lepton unification are
studied in the framework of Pati-Salam models with $A_4$ modular symmetry. The
three generations of the left-handed and right-handed fermions are assigned to
be triplet or singlets of $A_4$. The light neutrino masses are generated
through the type-I seesaw mechanism. We perform a systematic classification of
Pati-Salam models according to the transformations of matter fields under the
$A_4$ modular symmetry, and the general form of the fermion mass matrix is
given. We present four phenomenologically viable benchmark models which provide
excellent descriptions of masses and flavor mixing of quarks and leptons,
including neutrinos. In such models we find that the normal ordered neutrino
mass spectrum is preferred over the inverted case, with neutrinoless double
beta decay predicted to be too small to be observed by the next generation of
experiments.
|
[
{
"created": "Sat, 6 Apr 2024 17:03:02 GMT",
"version": "v1"
}
] |
2024-04-11
|
[
[
"Ding",
"Gui-Jun",
""
],
[
"Jiang",
"Si-Yi",
""
],
[
"King",
"Stephen F.",
""
],
[
"Lu",
"Jun-Nan",
""
],
[
"Qu",
"Bu-Yao",
""
]
] |
The flavor structure of quarks and leptons and quark-lepton unification are studied in the framework of Pati-Salam models with $A_4$ modular symmetry. The three generations of the left-handed and right-handed fermions are assigned to be triplet or singlets of $A_4$. The light neutrino masses are generated through the type-I seesaw mechanism. We perform a systematic classification of Pati-Salam models according to the transformations of matter fields under the $A_4$ modular symmetry, and the general form of the fermion mass matrix is given. We present four phenomenologically viable benchmark models which provide excellent descriptions of masses and flavor mixing of quarks and leptons, including neutrinos. In such models we find that the normal ordered neutrino mass spectrum is preferred over the inverted case, with neutrinoless double beta decay predicted to be too small to be observed by the next generation of experiments.
|
0810.4545
|
Francisco Larios
|
F. Penunuri, F. Larios
|
tbW vertex in the Littlest Higgs Model with T-parity
|
Version published in Phys. Rev. D79, 015013 (2009)
|
Phys.Rev.D79:015013,2009
|
10.1103/PhysRevD.79.015013
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A study of the effective tbW vertex is done in the littlest Higgs model with
T parity that includes the one loop induced weak dipole coefficient f_{2R}. The
top's width, the W-boson helicity in the t-> bW^+ decay as well as the
t-channel and the s-channel modes of single top quark production at the LHC are
then obtained for the tbW coupling. Our calculation is done in the Feynman-'t
Hooft gauge, and we provide details of the analysis, like exact formulas (to
all orders of the expansion variable v/f) of masses and mixing angles of all
the particles involved. Also, a complete and exact diagonalization (and
normalization) of the scalar sector of the model is made.
|
[
{
"created": "Mon, 27 Oct 2008 19:29:01 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Oct 2008 19:44:54 GMT",
"version": "v2"
},
{
"created": "Thu, 12 Feb 2009 21:29:38 GMT",
"version": "v3"
}
] |
2009-02-26
|
[
[
"Penunuri",
"F.",
""
],
[
"Larios",
"F.",
""
]
] |
A study of the effective tbW vertex is done in the littlest Higgs model with T parity that includes the one loop induced weak dipole coefficient f_{2R}. The top's width, the W-boson helicity in the t-> bW^+ decay as well as the t-channel and the s-channel modes of single top quark production at the LHC are then obtained for the tbW coupling. Our calculation is done in the Feynman-'t Hooft gauge, and we provide details of the analysis, like exact formulas (to all orders of the expansion variable v/f) of masses and mixing angles of all the particles involved. Also, a complete and exact diagonalization (and normalization) of the scalar sector of the model is made.
|
hep-ph/0607168
|
Jan Piclum
|
P. Marquard, J. H. Piclum, D. Seidel, M. Steinhauser
|
Fermionic Corrections to the Three-Loop Matching Coefficient of the
Vector Current
|
21 pages
|
Nucl.Phys.B758:144-160,2006
|
10.1016/j.nuclphysb.2006.09.015
|
DESY 06-107, SFB/CPP-06-31, TTP06-22
|
hep-ph
| null |
In this paper we consider the matching coefficient of the vector current
between Quantum Chromodynamics (QCD) and Non-Relativistic QCD (NRQCD) to
three-loop order in perturbation theory. We evaluate the fermionic corrections
containing a closed massless fermion loop. The results are building blocks both
for the bottom and top quark system at threshold. We explain in detail the
methods used for the evaluation of the Feynman diagrams, classify the occurring
master integrals and provide results for the latter. The numerical effects are
significant. They have the tendency to improve the behaviour of the
perturbative series -- both for the bottom and top quark system.
|
[
{
"created": "Fri, 14 Jul 2006 11:49:15 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Marquard",
"P.",
""
],
[
"Piclum",
"J. H.",
""
],
[
"Seidel",
"D.",
""
],
[
"Steinhauser",
"M.",
""
]
] |
In this paper we consider the matching coefficient of the vector current between Quantum Chromodynamics (QCD) and Non-Relativistic QCD (NRQCD) to three-loop order in perturbation theory. We evaluate the fermionic corrections containing a closed massless fermion loop. The results are building blocks both for the bottom and top quark system at threshold. We explain in detail the methods used for the evaluation of the Feynman diagrams, classify the occurring master integrals and provide results for the latter. The numerical effects are significant. They have the tendency to improve the behaviour of the perturbative series -- both for the bottom and top quark system.
|
hep-ph/9911419
|
Guo-Hong Wu
|
Guo-Hong Wu and Amarjit Soni
|
Novel CP-violating Effects in B decays from Charged-Higgs in a Two-Higgs
Doublet Model for the Top Quark
|
32 pages, 5 figures, section V.A revised, version to appear in PRD
|
Phys.Rev.D62:056005,2000
|
10.1103/PhysRevD.62.056005
|
BNL-HET-99/40, OITS-683
|
hep-ph hep-ex
| null |
We explore charged-Higgs cp-violating effects in a specific type III
two-Higgs doublet model which is theoretically attractive as it accommodates
the large mass of the top quark in a natural fashion. Two new CP-violating
phases arise from the right-handed up quark sector. We consider CP violation in
both neutral and charged B decays. Some of the important findings are as
follows. 1) Large direct-CP asymmetry is found to be possible for B+- to psi/J
K+-. 2) Sizable D-anti-D mixing effect at the percent level is found to be
admissible despite the stringent constraints from the data on K-anti-K mixing,
b to s gamma and B to tau nu decays. 3) A simple but distinctive CP asymmetry
pattern emerges in decays of B_d and B_s mesons, including B_d to psi/J K_S, D+
D-, and B_s to D_s+ D_s-, psi eta/eta^prime, psi/J K_S. 4) The effect of
D-anti-D mixing on the CP asymmetry in B+- to D/anti-D K+- and on the
extraction of the angle gamma of the unitarity triangle from such decays can be
significant.
|
[
{
"created": "Fri, 19 Nov 1999 23:37:25 GMT",
"version": "v1"
},
{
"created": "Thu, 27 Jul 2000 18:24:16 GMT",
"version": "v2"
}
] |
2011-03-23
|
[
[
"Wu",
"Guo-Hong",
""
],
[
"Soni",
"Amarjit",
""
]
] |
We explore charged-Higgs cp-violating effects in a specific type III two-Higgs doublet model which is theoretically attractive as it accommodates the large mass of the top quark in a natural fashion. Two new CP-violating phases arise from the right-handed up quark sector. We consider CP violation in both neutral and charged B decays. Some of the important findings are as follows. 1) Large direct-CP asymmetry is found to be possible for B+- to psi/J K+-. 2) Sizable D-anti-D mixing effect at the percent level is found to be admissible despite the stringent constraints from the data on K-anti-K mixing, b to s gamma and B to tau nu decays. 3) A simple but distinctive CP asymmetry pattern emerges in decays of B_d and B_s mesons, including B_d to psi/J K_S, D+ D-, and B_s to D_s+ D_s-, psi eta/eta^prime, psi/J K_S. 4) The effect of D-anti-D mixing on the CP asymmetry in B+- to D/anti-D K+- and on the extraction of the angle gamma of the unitarity triangle from such decays can be significant.
|
1412.3097
|
Siyoung Nam
|
Bum-Hoon Lee, Chanyong Park, and Siyoung Nam
|
Properties of Holographic Mesons on Dense Medium
|
18 pages, 8 Fig. numbers
| null |
10.1007/JHEP05(2015)011
| null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the energy dispersions of holographic light mesons and their decay
constants on dense nuclear medium. As the spatial momenta of mesons along the
boundary direction increase, both observables of the mesons not only increase
but also split according to the isospin charges. The decay constant of the
negative meson is more large than that of the positive meson of the same type
due to the chemical potentials of the background nucleons.
|
[
{
"created": "Tue, 9 Dec 2014 20:48:18 GMT",
"version": "v1"
}
] |
2015-06-11
|
[
[
"Lee",
"Bum-Hoon",
""
],
[
"Park",
"Chanyong",
""
],
[
"Nam",
"Siyoung",
""
]
] |
We study the energy dispersions of holographic light mesons and their decay constants on dense nuclear medium. As the spatial momenta of mesons along the boundary direction increase, both observables of the mesons not only increase but also split according to the isospin charges. The decay constant of the negative meson is more large than that of the positive meson of the same type due to the chemical potentials of the background nucleons.
|
1705.01929
|
Aleksey Rusov
|
Aleksey V. Rusov
|
Higher-Twist Effects in Light-Cone Sum Rule for the $B\to\pi$ Form
Factor
|
14 pages, 2 figures, 1 table
|
Eur.Phys.J. C77 (2017) no.7, 442
|
10.1140/epjc/s10052-017-5000-9
|
SI-HEP-2017-07, QFET-2017-06
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We calculate the higher-twist corrections to the QCD light-cone sum rule for
the $B \to \pi$ transition form factor. The light-cone expansion of the massive
quark propagator in the external gluonic field is extended to include new terms
containing the derivatives of gluon-field strength. The resulting analytical
expressions for the twist-5 and twist-6 contributions to the correlation
function are obtained in a factorized approximation, expressed via the product
of the lower-twist pion distribution amplitudes and the quark-condensate
density. The numerical analysis reveals that new higher-twist effects for the
$B \to \pi$ form factor are strongly suppressed. This result justifies the
conventional truncation of the operator product expansion in the light-cone sum
rules up to twist-4 terms.
|
[
{
"created": "Thu, 4 May 2017 17:49:44 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Aug 2017 10:41:12 GMT",
"version": "v2"
}
] |
2017-08-02
|
[
[
"Rusov",
"Aleksey V.",
""
]
] |
We calculate the higher-twist corrections to the QCD light-cone sum rule for the $B \to \pi$ transition form factor. The light-cone expansion of the massive quark propagator in the external gluonic field is extended to include new terms containing the derivatives of gluon-field strength. The resulting analytical expressions for the twist-5 and twist-6 contributions to the correlation function are obtained in a factorized approximation, expressed via the product of the lower-twist pion distribution amplitudes and the quark-condensate density. The numerical analysis reveals that new higher-twist effects for the $B \to \pi$ form factor are strongly suppressed. This result justifies the conventional truncation of the operator product expansion in the light-cone sum rules up to twist-4 terms.
|
2011.08747
|
Bing-Dong Wan
|
Bing-Dong Wan and Cong-Feng Qiao
|
About the exotic structure of $Z_{cs}$
|
31 pages, 4 figures, a few expressions are amended
| null |
10.1016/j.nuclphysb.2021.115450
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
Very recently a new hadronic structure around $3.98$ GeV was observed in
BESIII experiment. From its decay modes, it is reasonable for people to assign
it to the category of exotic state, say $Z^+_{cs}$, the stranged-parter of
$Z_{c}(3900)$. This finding indicates for the first time the exotic state with
strange quark in charm sector, and hence has a peculiar importance. By virtue
of the QCD Sum Rule technique, we analyze the $Z^+_{cs}$ about its possible
configuration and physical properties, and find it could be configured as a
mixture of two types of structures, $[1_c]_{\bar{c} u}\otimes[1_c]_{\bar{s} c}$
and $[1_c]_{\bar{c} c}\otimes[1_c]_{\bar{s} u}$, or $[3_c]_{\bar{c}
u}\otimes[\bar{3}_c]_{\bar{s} c}$ and $[3_c]_{\bar{c}
c}\otimes[\bar{3}_c]_{\bar{s} u}$, with $J^P=1^+$. Physically, it then appears
to be the emergence of a compound of four possible currents in each
configuration, which tells the single current evaluation of hadron spectroscopy
and their decay properties are sometimes not enough. We find in both cases the
energy spectra may fit well with the experimental observation, i.e. $3.98$ GeV,
within the uncertainties, while noted the former is not favored by vector meson
exchange model. Various $Z^+_{cs}(3980)$ decay modes are evaluated, which are
critical for pinning down its configuration and left for experimental
verification. We also predict the mass of $Z^0_{cs}$, the neutral partner of
$Z^+_{cs}(3980)$, and analyze its dominant decay probabilities.
|
[
{
"created": "Tue, 17 Nov 2020 16:21:48 GMT",
"version": "v1"
},
{
"created": "Thu, 24 Dec 2020 16:20:14 GMT",
"version": "v2"
}
] |
2021-06-30
|
[
[
"Wan",
"Bing-Dong",
""
],
[
"Qiao",
"Cong-Feng",
""
]
] |
Very recently a new hadronic structure around $3.98$ GeV was observed in BESIII experiment. From its decay modes, it is reasonable for people to assign it to the category of exotic state, say $Z^+_{cs}$, the stranged-parter of $Z_{c}(3900)$. This finding indicates for the first time the exotic state with strange quark in charm sector, and hence has a peculiar importance. By virtue of the QCD Sum Rule technique, we analyze the $Z^+_{cs}$ about its possible configuration and physical properties, and find it could be configured as a mixture of two types of structures, $[1_c]_{\bar{c} u}\otimes[1_c]_{\bar{s} c}$ and $[1_c]_{\bar{c} c}\otimes[1_c]_{\bar{s} u}$, or $[3_c]_{\bar{c} u}\otimes[\bar{3}_c]_{\bar{s} c}$ and $[3_c]_{\bar{c} c}\otimes[\bar{3}_c]_{\bar{s} u}$, with $J^P=1^+$. Physically, it then appears to be the emergence of a compound of four possible currents in each configuration, which tells the single current evaluation of hadron spectroscopy and their decay properties are sometimes not enough. We find in both cases the energy spectra may fit well with the experimental observation, i.e. $3.98$ GeV, within the uncertainties, while noted the former is not favored by vector meson exchange model. Various $Z^+_{cs}(3980)$ decay modes are evaluated, which are critical for pinning down its configuration and left for experimental verification. We also predict the mass of $Z^0_{cs}$, the neutral partner of $Z^+_{cs}(3980)$, and analyze its dominant decay probabilities.
|
1810.09393
|
Chao-Hsi Chang
|
Xu-Chang Zheng, Chao-Hsi Chang, Tai-Fu Feng
|
A proposal on complementary determination of the electro-weak mixing
angles ${\rm sin^2\theta_W}$ at a super Z-factory
|
9 pages, 7 figures
|
Sci. China-Phys. Mech. Astron., Aug. 2020 Vol 63, No. 8:281011
|
10.1007/s11433-019-1497-9
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A proposal on determination of the effective electro-weak mixing angle ${\rm
sin^2\theta_{eff}^f\;(f=c,b)}$ at a super Z-factory (an $e^+e^-$ collider
designed with the possible highest luminosity and running around the center
mass energy $\sqrt s=m_Z$) is proposed. It is to determine how the effective
mixing angles depend on the flavors, especially the flavors $c$, $b$ (with the
determined effective ones, the electro-weak mixing angles ${\rm
sin^2\theta_W^f\;(f=c,b)}$ of Standard Model can be derived out precisely). The
key point of the proposal is that at such a super Z-factory, via measuring the
forward-backward ($A_{FB}$), left-right ($A_{LR}$) and combined left-right
forward-backward ($A^{FB}_{LR}$) asymmetries of the produced doubly
heavy-flavored hadrons (such as $B_c$, $B_c^*$ and the baryons $H_{QQ'q}$:
$\Xi_{cc}$, $\Xi_{bc}$ and $\Xi_{bb}$ etc) in the relevant production processes
$e^+e^-\to B_c+\cdots$ and $e^+e^-\to H_{QQ'q}+\cdots$ one may complement the
final determination of the mixing angle ${\rm sin^2\theta_W^f\;(f=c,b)}$ of
Standard Model. The advantage of the proposed way to determine the effective
electro-weak mixing angles is that the doubly heavy flavor(s) and the out-going
direction of the produced doubly-heavy hadron can be experimental determined
precisely, i.e. there are no such errors caused by missing identification of
the heavy flavor(s) and by determining the so-called thrust axis of the
produced jets, which can not be avoided in the early determination at LEP-I and
SLC.
|
[
{
"created": "Mon, 22 Oct 2018 16:30:14 GMT",
"version": "v1"
},
{
"created": "Sun, 29 Dec 2019 07:23:08 GMT",
"version": "v2"
}
] |
2020-06-16
|
[
[
"Zheng",
"Xu-Chang",
""
],
[
"Chang",
"Chao-Hsi",
""
],
[
"Feng",
"Tai-Fu",
""
]
] |
A proposal on determination of the effective electro-weak mixing angle ${\rm sin^2\theta_{eff}^f\;(f=c,b)}$ at a super Z-factory (an $e^+e^-$ collider designed with the possible highest luminosity and running around the center mass energy $\sqrt s=m_Z$) is proposed. It is to determine how the effective mixing angles depend on the flavors, especially the flavors $c$, $b$ (with the determined effective ones, the electro-weak mixing angles ${\rm sin^2\theta_W^f\;(f=c,b)}$ of Standard Model can be derived out precisely). The key point of the proposal is that at such a super Z-factory, via measuring the forward-backward ($A_{FB}$), left-right ($A_{LR}$) and combined left-right forward-backward ($A^{FB}_{LR}$) asymmetries of the produced doubly heavy-flavored hadrons (such as $B_c$, $B_c^*$ and the baryons $H_{QQ'q}$: $\Xi_{cc}$, $\Xi_{bc}$ and $\Xi_{bb}$ etc) in the relevant production processes $e^+e^-\to B_c+\cdots$ and $e^+e^-\to H_{QQ'q}+\cdots$ one may complement the final determination of the mixing angle ${\rm sin^2\theta_W^f\;(f=c,b)}$ of Standard Model. The advantage of the proposed way to determine the effective electro-weak mixing angles is that the doubly heavy flavor(s) and the out-going direction of the produced doubly-heavy hadron can be experimental determined precisely, i.e. there are no such errors caused by missing identification of the heavy flavor(s) and by determining the so-called thrust axis of the produced jets, which can not be avoided in the early determination at LEP-I and SLC.
|
0706.3139
|
Markus Diehl
|
M. Diehl and W. Kugler
|
Exclusive Meson Production at NLO
|
4 pages. Talk given at DIS 2007. v2: corrections in plots, modified
conclusions
| null | null |
DESY 07-093
|
hep-ph
| null |
We report on numerical studies of the NLO corrections to exclusive meson
electroproduction, both in collider and fixed-target kinematics. Corrections
are found to be huge at small xB and sizeable at intermediate or large xB.
|
[
{
"created": "Thu, 21 Jun 2007 12:34:51 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Aug 2007 11:37:01 GMT",
"version": "v2"
}
] |
2007-08-08
|
[
[
"Diehl",
"M.",
""
],
[
"Kugler",
"W.",
""
]
] |
We report on numerical studies of the NLO corrections to exclusive meson electroproduction, both in collider and fixed-target kinematics. Corrections are found to be huge at small xB and sizeable at intermediate or large xB.
|
1312.5666
|
Gudrun Heinrich
|
Johannes Schlenk, Gudrun Heinrich, Jan Winter
|
NLO QCD corrections to WWbb production and top quark observables
|
9 pages, 4 figures, contribution to the 11th International Symposium
on Radiative Corrections (RADCOR 2013), September 2013, Lumley Castle Hotel,
Durham, UK; References updated
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present the NLO QCD corrections to the production of a W+W- pair and two
b-jets, including the leptonic decays of the W bosons. Contributions from
singly resonant and non-resonant top quarks are fully taken into account. We
also discuss observables relevant for top quark mass measurements and top quark
asymmetries.
|
[
{
"created": "Thu, 19 Dec 2013 17:53:23 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Dec 2013 08:54:40 GMT",
"version": "v2"
}
] |
2013-12-25
|
[
[
"Schlenk",
"Johannes",
""
],
[
"Heinrich",
"Gudrun",
""
],
[
"Winter",
"Jan",
""
]
] |
We present the NLO QCD corrections to the production of a W+W- pair and two b-jets, including the leptonic decays of the W bosons. Contributions from singly resonant and non-resonant top quarks are fully taken into account. We also discuss observables relevant for top quark mass measurements and top quark asymmetries.
|
hep-ph/0703026
|
Guang-You Qin
|
Guang-You Qin, Abhijit Majumder, Charles Gale
|
Electromagnetic Radiation from Broken Symmetries in Relativistic Nuclear
Collisions
|
6 pages, 3 figures, Contribution to the Quark Matter 2006 Conference
in Shanghai, Nov 14-20 2006, to be submitted to International Journal of
Modern Physics E (World Scientific)
|
Int.J.Mod.Phys.E16:2350-2355,2007
|
10.1142/S0218301307007921
| null |
hep-ph nucl-ex nucl-th
| null |
A new channel of direct photon production from a quark gluon plasma (QGP) is
explored in the framework of high-temperature QCD. This process appears at
next-to-leading order, in the presence of a charge asymmetry in the excited
matter. The photon production rate from this new mechanism is suppressed
compared to the QCD annihilation and Compton scattering at low baryon density
but assumes importance in baryon-rich matter.
|
[
{
"created": "Fri, 2 Mar 2007 18:12:27 GMT",
"version": "v1"
}
] |
2010-11-26
|
[
[
"Qin",
"Guang-You",
""
],
[
"Majumder",
"Abhijit",
""
],
[
"Gale",
"Charles",
""
]
] |
A new channel of direct photon production from a quark gluon plasma (QGP) is explored in the framework of high-temperature QCD. This process appears at next-to-leading order, in the presence of a charge asymmetry in the excited matter. The photon production rate from this new mechanism is suppressed compared to the QCD annihilation and Compton scattering at low baryon density but assumes importance in baryon-rich matter.
|
1709.00689
|
Ailin Zhang
|
Dan-Dan Ye, Ze Zhao and Ailin Zhang
|
Study of $P$-wave excitations of observed charmed strange baryons
|
10 pages, 1 figure, 11 tables, RevTex, to appear in Phys.Rev.D
|
Phys. Rev. D 96, 114009 (2017)
|
10.1103/PhysRevD.96.114009
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Many excited charmed strange baryons such as $\Xi_c(2790)$, $\Xi_c(2815)$,
$\Xi_c(2930)$, $\Xi_c(2980)$, $\Xi_c(3055)$, $\Xi_c(3080)$ and $\Xi_c(3123)$
have been observed. In order to understand their internal structure and to
determine their spin-parities, the strong decay properties of these baryons as
possible $P$-wave excited $\Xi_c$ candidates have been systematically studied
in a $^3P_0$ model. The configurations and $J^P$ assignments of $\Xi_c(2790)$,
$\Xi_c(2815)$, $\Xi_c(2930)$, $\Xi_c(2980)$, $\Xi_c(3055)$, $\Xi_c(3080)$ and
$\Xi_c(3123)$ have been explored based on recent experimental data. In our
analyses, $\Xi_c(3055)$, $\Xi_c(3080)$ and $\Xi_c(3123)$ seem impossible to be
the $P$-wave excited $\Xi_c$. $\Xi_c(2790)$, $\Xi_c(2815)$, $\Xi_c(2930)$ and
$\Xi_c(2980)$ may be the $P$-wave excited $\Xi_c$. In particular, $\Xi_c(2790)$
and $\Xi_c(2815)$ are very possibly the $P$-wave excited $\Xi_{c1}(1/2^-)$ and
$\Xi_{c1}(3/2^-)$, respectively. $\Xi_c(2980)$ may be the $P$-wave excited
$\Xi_{c1}^{'}(\frac{1}{2}^-)$. $\Xi_c(2930)$ may be the $P$-wave
$\Xi_{c0}^{'}(\frac{1}{2}^-)$, $\tilde{\Xi}_{c0}(\frac{1}{2}^-)$,
$\Xi_{c2}^{'}(\frac{3}{2}^-)$, $\Xi_{c2}^{'}(\frac{5}{2}^-)$,
$\tilde{\Xi}_{c2}(\frac{3}{2}^-)$ or $\tilde{\Xi}_{c2}(\frac{5}{2}^-)$.
Furthermore, some branching fraction ratios related to the internal structure
and quark configuration of $P$-wave $\Xi_c$ have also been computed.
Measurements of these ratios in the future will be helpful to understand these
excited $\Xi_c$.
|
[
{
"created": "Sun, 3 Sep 2017 09:15:53 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Nov 2017 02:40:31 GMT",
"version": "v2"
}
] |
2017-12-20
|
[
[
"Ye",
"Dan-Dan",
""
],
[
"Zhao",
"Ze",
""
],
[
"Zhang",
"Ailin",
""
]
] |
Many excited charmed strange baryons such as $\Xi_c(2790)$, $\Xi_c(2815)$, $\Xi_c(2930)$, $\Xi_c(2980)$, $\Xi_c(3055)$, $\Xi_c(3080)$ and $\Xi_c(3123)$ have been observed. In order to understand their internal structure and to determine their spin-parities, the strong decay properties of these baryons as possible $P$-wave excited $\Xi_c$ candidates have been systematically studied in a $^3P_0$ model. The configurations and $J^P$ assignments of $\Xi_c(2790)$, $\Xi_c(2815)$, $\Xi_c(2930)$, $\Xi_c(2980)$, $\Xi_c(3055)$, $\Xi_c(3080)$ and $\Xi_c(3123)$ have been explored based on recent experimental data. In our analyses, $\Xi_c(3055)$, $\Xi_c(3080)$ and $\Xi_c(3123)$ seem impossible to be the $P$-wave excited $\Xi_c$. $\Xi_c(2790)$, $\Xi_c(2815)$, $\Xi_c(2930)$ and $\Xi_c(2980)$ may be the $P$-wave excited $\Xi_c$. In particular, $\Xi_c(2790)$ and $\Xi_c(2815)$ are very possibly the $P$-wave excited $\Xi_{c1}(1/2^-)$ and $\Xi_{c1}(3/2^-)$, respectively. $\Xi_c(2980)$ may be the $P$-wave excited $\Xi_{c1}^{'}(\frac{1}{2}^-)$. $\Xi_c(2930)$ may be the $P$-wave $\Xi_{c0}^{'}(\frac{1}{2}^-)$, $\tilde{\Xi}_{c0}(\frac{1}{2}^-)$, $\Xi_{c2}^{'}(\frac{3}{2}^-)$, $\Xi_{c2}^{'}(\frac{5}{2}^-)$, $\tilde{\Xi}_{c2}(\frac{3}{2}^-)$ or $\tilde{\Xi}_{c2}(\frac{5}{2}^-)$. Furthermore, some branching fraction ratios related to the internal structure and quark configuration of $P$-wave $\Xi_c$ have also been computed. Measurements of these ratios in the future will be helpful to understand these excited $\Xi_c$.
|
hep-ph/9403327
|
Tom Browder
|
The CLEO Collaboration
|
Precision Measurement of the $D_s^{*+}- D_s^+$ Mass Difference
|
18 pages uuencoded compressed postscript (process with uudecode then
gunzip). hardcopies with figures can be obtained by sending mail to:
preprints@lns62.lns.cornell.edu
|
Phys.Rev.D50:1884-1891,1994
|
10.1103/PhysRevD.50.1884
|
CLNS94-1271, CLEO 94-6
|
hep-ph hep-ex
| null |
We have measured the vector-pseudoscalar mass splitting $M(D_s^{*+})-M(D_s^+)
= 144.22\pm 0.47\pm 0.37 MeV$, significantly more precise than the previous
world average. We minimize the systematic errors by also measuring the
vector-pseudoscalar mass difference $M(D^{*0})-M(D^0)$ using the radiative
decay $D^{*0}\rightarrow D^0\gamma$, obtaining
$[M(D_s^{*+})-M(D_s^+)]-[M(D^{*0})-M(D^0)] = 2.09\pm 0.47\pm 0.37 MeV$. This is
then combined with our previous high-precision measurement of
$M(D^{*0})-M(D^0)$, which used the decay $D^{*0}\rightarrow D^0\pi^0$. We also
measure the mass difference $M(D_s^+)-M(D^+)=99.5\pm 0.6\pm 0.3$ MeV, using the
$\phi\pi^+$ decay modes of the $D_s^+$ and $D^+$ mesons.
|
[
{
"created": "Tue, 22 Mar 1994 02:03:15 GMT",
"version": "v1"
}
] |
2012-08-27
|
[
[
"The CLEO Collaboration",
"",
""
]
] |
We have measured the vector-pseudoscalar mass splitting $M(D_s^{*+})-M(D_s^+) = 144.22\pm 0.47\pm 0.37 MeV$, significantly more precise than the previous world average. We minimize the systematic errors by also measuring the vector-pseudoscalar mass difference $M(D^{*0})-M(D^0)$ using the radiative decay $D^{*0}\rightarrow D^0\gamma$, obtaining $[M(D_s^{*+})-M(D_s^+)]-[M(D^{*0})-M(D^0)] = 2.09\pm 0.47\pm 0.37 MeV$. This is then combined with our previous high-precision measurement of $M(D^{*0})-M(D^0)$, which used the decay $D^{*0}\rightarrow D^0\pi^0$. We also measure the mass difference $M(D_s^+)-M(D^+)=99.5\pm 0.6\pm 0.3$ MeV, using the $\phi\pi^+$ decay modes of the $D_s^+$ and $D^+$ mesons.
|
hep-ph/0411130
|
Ian D. Lawrie
|
Ian D. Lawrie
|
Numerical investigation of friction in inflaton equations of motion
|
13 pages, 7 figures
|
Phys.Rev. D71 (2005) 025021
|
10.1103/PhysRevD.71.025021
| null |
hep-ph astro-ph gr-qc hep-th
| null |
The equation of motion for the expectation value of a scalar quantum field
does not have the local form that is commonly assumed in studies of
inflationary cosmology. We have recently argued that the true, temporally
non-local equation of motion does not possess a time-derivative expansion and
that the conversion of inflaton energy into particles is not, in principle,
described by the friction term estimated from linear response theory. Here, we
use numerical methods to investigate whether this obstacle to deriving a local
equation of motion is purely formal, or of some quantitative importance. Using
a simple scalar-field model, we find that, although the non-equilibrium
evolution can exhibit significant damping, this damping is not well described
by the local equation of motion obtained from linear response theory. It is
possible that linear response theory does not apply to the situation we study
only because thermalization turns out to be slow, but we argue that that the
large discrepancies we observe indicate a failure of the local approximation at
a more fundamental level.
|
[
{
"created": "Tue, 9 Nov 2004 11:14:36 GMT",
"version": "v1"
}
] |
2009-11-10
|
[
[
"Lawrie",
"Ian D.",
""
]
] |
The equation of motion for the expectation value of a scalar quantum field does not have the local form that is commonly assumed in studies of inflationary cosmology. We have recently argued that the true, temporally non-local equation of motion does not possess a time-derivative expansion and that the conversion of inflaton energy into particles is not, in principle, described by the friction term estimated from linear response theory. Here, we use numerical methods to investigate whether this obstacle to deriving a local equation of motion is purely formal, or of some quantitative importance. Using a simple scalar-field model, we find that, although the non-equilibrium evolution can exhibit significant damping, this damping is not well described by the local equation of motion obtained from linear response theory. It is possible that linear response theory does not apply to the situation we study only because thermalization turns out to be slow, but we argue that that the large discrepancies we observe indicate a failure of the local approximation at a more fundamental level.
|
1011.4939
|
Jae-hyeon Park
|
Jae-hyeon Park (DESY Hamburg)
|
Metastability bounds on flavour-violating trilinear soft terms in the
MSSM
|
13 pages, published version
|
Phys.Rev.D83:055015,2011
|
10.1103/PhysRevD.83.055015
|
DESY 10-214
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The vacuum stability bounds on flavour-violating trilinear soft terms are
revisited from the viewpoint that one should not ban a standard-model-like
false vacuum as long as it is long-lived on a cosmological timescale. The
vacuum transition rate is evaluated numerically by searching for the bounce
configuration. Like stability, a metastability bound does not decouple even if
sfermion masses grow. Apart from being more generous than stability, the new
bounds are largely independent of Yukawa couplings except for the stop
trilinears. With vacuum longevity imposed on otherwise arbitrary LR insertions,
it is found that a super flavour factory has the potential to probe sparticle
masses up to a few TeV through B and tau physics whereas the MEG experiment
might cover a far wider range. In the stop sector, metastability is more
restrictive than any existing experimental constraint such as from electroweak
precision data. Also discussed are dependency on other parameters and
reliability under radiative corrections.
|
[
{
"created": "Mon, 22 Nov 2010 21:00:00 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Jan 2011 22:51:14 GMT",
"version": "v2"
},
{
"created": "Wed, 23 Mar 2011 16:19:14 GMT",
"version": "v3"
}
] |
2015-03-17
|
[
[
"Park",
"Jae-hyeon",
"",
"DESY Hamburg"
]
] |
The vacuum stability bounds on flavour-violating trilinear soft terms are revisited from the viewpoint that one should not ban a standard-model-like false vacuum as long as it is long-lived on a cosmological timescale. The vacuum transition rate is evaluated numerically by searching for the bounce configuration. Like stability, a metastability bound does not decouple even if sfermion masses grow. Apart from being more generous than stability, the new bounds are largely independent of Yukawa couplings except for the stop trilinears. With vacuum longevity imposed on otherwise arbitrary LR insertions, it is found that a super flavour factory has the potential to probe sparticle masses up to a few TeV through B and tau physics whereas the MEG experiment might cover a far wider range. In the stop sector, metastability is more restrictive than any existing experimental constraint such as from electroweak precision data. Also discussed are dependency on other parameters and reliability under radiative corrections.
|
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