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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1005.4664
|
Shi-Yuan Li
|
Yi Jin, Shi-Yuan Li, Zong-Guo Si and Tao Yao
|
Unitarity and Entropy Change in Exclusive Quark Combination Models
|
4 pages in revtex, 1 figure, a ref. added
| null | null | null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Entropy change in exclusive quark combination models is not an isolated
problem. Contrary to adding and tuning some parameters to the relevant model(s)
to fix the entropy, we show that it relates to the most general principles.
Unitarity of the combination model is demonstrated to play the central r\^{o}le
that guarantees the non-decrease of the entropy in the exclusive combination
process.
|
[
{
"created": "Tue, 25 May 2010 19:19:45 GMT",
"version": "v1"
},
{
"created": "Thu, 24 Jun 2010 08:31:33 GMT",
"version": "v2"
}
] |
2010-06-25
|
[
[
"Jin",
"Yi",
""
],
[
"Li",
"Shi-Yuan",
""
],
[
"Si",
"Zong-Guo",
""
],
[
"Yao",
"Tao",
""
]
] |
Entropy change in exclusive quark combination models is not an isolated problem. Contrary to adding and tuning some parameters to the relevant model(s) to fix the entropy, we show that it relates to the most general principles. Unitarity of the combination model is demonstrated to play the central r\^{o}le that guarantees the non-decrease of the entropy in the exclusive combination process.
|
1111.6299
|
Shabbar Raza
|
Ilia Gogoladze, Shabbar Raza, Qaisar Shafi
|
Neutralino-Sbottom Coannihilation in SU(5)
|
15 pages, 4 figures and 1 table
| null |
10.1007/JHEP03(2012)054
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We identify within the SU(5) framework the minimum number of soft
supersymmetry breaking parameters which can yield a bottom squrak (sbottom) as
the next to lightest supersymmetric particle. We focus in particular on the
neutralino-sbottom coannihilation scenario which gives rise to the desired
neutralino dark matter relic density. We find solutions in which the sbottom
mass is greater than or of order 210 GeV, while the gluino and the first two
family squarks are heavier than 1 TeV. Some benchmark points which can be
tested at the LHC are presented.
|
[
{
"created": "Sun, 27 Nov 2011 21:31:05 GMT",
"version": "v1"
}
] |
2015-06-03
|
[
[
"Gogoladze",
"Ilia",
""
],
[
"Raza",
"Shabbar",
""
],
[
"Shafi",
"Qaisar",
""
]
] |
We identify within the SU(5) framework the minimum number of soft supersymmetry breaking parameters which can yield a bottom squrak (sbottom) as the next to lightest supersymmetric particle. We focus in particular on the neutralino-sbottom coannihilation scenario which gives rise to the desired neutralino dark matter relic density. We find solutions in which the sbottom mass is greater than or of order 210 GeV, while the gluino and the first two family squarks are heavier than 1 TeV. Some benchmark points which can be tested at the LHC are presented.
|
0805.3597
|
Cristina Manuel
|
Massimo Mannarelli and Cristina Manuel
|
Jet-induced gauge field instabilities in the quark-gluon plasma
|
7 pages; invited talk at the YITP symposium on "Fundamental Problems
in Hot and/or dense QCD", Kyoto, Japan, 3-6 March 2008
|
Prog.Theor.Phys.Suppl.174:122-128,2008
|
10.1143/PTPS.174.122
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss the properties of the collective modes of a system composed by a
thermalized quark-gluon plasma traversed by a relativistic jet of partons. The
transport equations obeyed by the components of the plasma and of the jet are
studied in the Vlasov approximation. Assuming that the partons in the jet can
be described with a tsunami-like distribution function we derive the
expressions of the dispersion law of the collective modes. Then the behavior of
the unstable gauge modes of the system is analyzed for various values of the
velocity of the jet, of the momentum of the collective modes and of the angle
between these two quantities. We find that the most unstable modes are those
with momentum orthogonal to the velocity of the jet, and the effect is stronger
for ultrarelativistic jet velocities. Our results suggest a new possible
collective mechanism for the description of the jet quenching phenomena in
heavy ion collisions.
|
[
{
"created": "Fri, 23 May 2008 08:54:35 GMT",
"version": "v1"
}
] |
2009-01-14
|
[
[
"Mannarelli",
"Massimo",
""
],
[
"Manuel",
"Cristina",
""
]
] |
We discuss the properties of the collective modes of a system composed by a thermalized quark-gluon plasma traversed by a relativistic jet of partons. The transport equations obeyed by the components of the plasma and of the jet are studied in the Vlasov approximation. Assuming that the partons in the jet can be described with a tsunami-like distribution function we derive the expressions of the dispersion law of the collective modes. Then the behavior of the unstable gauge modes of the system is analyzed for various values of the velocity of the jet, of the momentum of the collective modes and of the angle between these two quantities. We find that the most unstable modes are those with momentum orthogonal to the velocity of the jet, and the effect is stronger for ultrarelativistic jet velocities. Our results suggest a new possible collective mechanism for the description of the jet quenching phenomena in heavy ion collisions.
|
hep-ph/9707249
|
Nir Polonsky
|
Hans Peter Nilles and Nir Polonsky
|
Gravitational divergences as a mediator of supersymmetry breaking
|
12 pages. LaTex + RevTex
|
Phys.Lett. B412 (1997) 69-76
|
10.1016/S0370-2693(97)01042-3
|
TUM-HEP-278/97, RU--97--47
|
hep-ph
| null |
Gravitational divergences associated with singlet fields in supersymmetric
theories are reexamined, and their possible contributions to the low-energy
effective theory are pointed out. We demonstrate that such divergences are not
necessarily harmful and that Planck-scale physics could play an important role
in models of low-energy supersymmetry breaking via a radiatively induced
tadpole term in the scalar potential. In this case, gravitational divergences
play the role of the supersymmetry breaking mediator, leading to a simple
realization of the so-called messenger model. We also point out a new mechanism
for the generation of mass terms for the Higgs fields in models of low-energy
supersymmetry breaking, as well as a horizontal messenger mechanism in which
the horizontally charged scalars are rendered heavy. Implications to the flavor
problem in supersymmetric models are also discussed.
|
[
{
"created": "Fri, 4 Jul 1997 15:01:56 GMT",
"version": "v1"
}
] |
2009-10-30
|
[
[
"Nilles",
"Hans Peter",
""
],
[
"Polonsky",
"Nir",
""
]
] |
Gravitational divergences associated with singlet fields in supersymmetric theories are reexamined, and their possible contributions to the low-energy effective theory are pointed out. We demonstrate that such divergences are not necessarily harmful and that Planck-scale physics could play an important role in models of low-energy supersymmetry breaking via a radiatively induced tadpole term in the scalar potential. In this case, gravitational divergences play the role of the supersymmetry breaking mediator, leading to a simple realization of the so-called messenger model. We also point out a new mechanism for the generation of mass terms for the Higgs fields in models of low-energy supersymmetry breaking, as well as a horizontal messenger mechanism in which the horizontally charged scalars are rendered heavy. Implications to the flavor problem in supersymmetric models are also discussed.
|
1402.5690
|
Kirill Melnikov
|
Kirill Melnikov, Arkady Vainshtein and Mikhail Voloshin
|
Remarks on the effect of bound states and threshold in g-2
|
3 pages, v.2 mistake in the derivation corrected, discussion
expanded, conclusions unchanged
|
Phys. Rev. D 90, 017301 (2014)
|
10.1103/PhysRevD.90.017301
|
NSF-KITP-14-011, FTPI-MINN-14/6, UMN-TH-3327/14
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Recently, the contribution of positronium bound states to the electron
anomalous magnetic moment was computed in Refs.[1,2]. It was argued there that
this O(alpha^5) contribution is missed if electron g-2 is calculated within
conventional perturbative QED and, as such, it must be added to the
perturbative five-loop result. We show that this conclusion is flawed and that
no additional contributions to g-2 are generated in QED beyond the perturbation
theory.
|
[
{
"created": "Sun, 23 Feb 2014 23:31:07 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Mar 2014 16:19:54 GMT",
"version": "v2"
}
] |
2014-07-23
|
[
[
"Melnikov",
"Kirill",
""
],
[
"Vainshtein",
"Arkady",
""
],
[
"Voloshin",
"Mikhail",
""
]
] |
Recently, the contribution of positronium bound states to the electron anomalous magnetic moment was computed in Refs.[1,2]. It was argued there that this O(alpha^5) contribution is missed if electron g-2 is calculated within conventional perturbative QED and, as such, it must be added to the perturbative five-loop result. We show that this conclusion is flawed and that no additional contributions to g-2 are generated in QED beyond the perturbation theory.
|
1007.2502
|
Ho-Meoyng Choi
|
Ho-Meoyng Choi (Kyungpook National University) and Chueng-Ryong Ji
(North Carolina State University)
|
Light-front dynamic analysis of transition form factors in the process
of $P\to V\ell\nu_{\ell}$
|
23 pages, 2 figures, version to appear in Nuclear Physics A
|
Nucl.Phys.A856:95-111,2011
|
10.1016/j.nuclphysa.2011.03.001
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the light-front zero-mode contribution to the weak transition
form factors between pseudoscalar and vector mesons using a covariant fermion
field theory model in $(3+1)$ dimensions. In particular, we discuss the form
factors $a_-(q^2)$ and $f(q^2)$ which have been suspected to have the zero-mode
contribution in the $q^+=0$ frame. While the zero-mode contribution in
principle depends on the form of the vector meson vertex $\Gamma^\mu=\gamma^\mu
- (2k-P_V)^\mu/D$, the form factor $f(q^2)$ is found to be free from the zero
mode if the denominator $D$ contains the term proportional to the light-front
longitudinal momentum fraction factor $(1/x)^n$ of the struck quark with the
power $n>0$. Although the form factor $a_-(q^2)$ is not free from the zero
mode, the zero-mode contribution comes only either from the simple vertex
$\Gamma^\mu=\gamma^\mu$ term or from the other term just with a constant $D$
(i.e. $n=0$), but not with the momentum-dependent denominator (i.e. $D\sim
(1/x)^n$ with $n>0$). We identify the zero-mode contribution to $a_-(q^2)$ and
incorporate it as a convolution of the zero-mode operator with the initial and
final state light-front wave functions. The covariance (i.e. frame
independence) of our model has been checked by performing the light-front
calculations both in the $q^+=0$ and $q^+\neq 0$ frames. We present our
numerical result for the $B\to\rho$ transition for an explicit demonstration of
our findings.
|
[
{
"created": "Thu, 15 Jul 2010 08:26:00 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Mar 2011 15:05:25 GMT",
"version": "v2"
}
] |
2011-04-20
|
[
[
"Choi",
"Ho-Meoyng",
"",
"Kyungpook National University"
],
[
"Ji",
"Chueng-Ryong",
"",
"North Carolina State University"
]
] |
We investigate the light-front zero-mode contribution to the weak transition form factors between pseudoscalar and vector mesons using a covariant fermion field theory model in $(3+1)$ dimensions. In particular, we discuss the form factors $a_-(q^2)$ and $f(q^2)$ which have been suspected to have the zero-mode contribution in the $q^+=0$ frame. While the zero-mode contribution in principle depends on the form of the vector meson vertex $\Gamma^\mu=\gamma^\mu - (2k-P_V)^\mu/D$, the form factor $f(q^2)$ is found to be free from the zero mode if the denominator $D$ contains the term proportional to the light-front longitudinal momentum fraction factor $(1/x)^n$ of the struck quark with the power $n>0$. Although the form factor $a_-(q^2)$ is not free from the zero mode, the zero-mode contribution comes only either from the simple vertex $\Gamma^\mu=\gamma^\mu$ term or from the other term just with a constant $D$ (i.e. $n=0$), but not with the momentum-dependent denominator (i.e. $D\sim (1/x)^n$ with $n>0$). We identify the zero-mode contribution to $a_-(q^2)$ and incorporate it as a convolution of the zero-mode operator with the initial and final state light-front wave functions. The covariance (i.e. frame independence) of our model has been checked by performing the light-front calculations both in the $q^+=0$ and $q^+\neq 0$ frames. We present our numerical result for the $B\to\rho$ transition for an explicit demonstration of our findings.
|
1601.02607
|
Ian Moult
|
Daniel W. Kolodrubetz, Ian Moult, Iain W. Stewart
|
Building Blocks for Subleading Helicity Operators
|
22 pages without references, 2 figures v2. Updated minor typo in
Table 1
| null |
10.1007/JHEP05(2016)139
|
MIT-CTP 4748
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
On-shell helicity methods provide powerful tools for determining scattering
amplitudes, which have a one-to-one correspondence with leading power helicity
operators in the Soft-Collinear Effective Theory (SCET) away from singular
regions of phase space. We show that helicity based operators are also useful
for enumerating power suppressed SCET operators, which encode subleading
amplitude information about singular limits. In particular, we present a
complete set of scalar helicity building blocks that are valid for constructing
operators at any order in the SCET power expansion. We also describe an
interesting angular momentum selection rule that restricts how these building
blocks can be assembled.
|
[
{
"created": "Mon, 11 Jan 2016 21:00:00 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Oct 2016 08:30:39 GMT",
"version": "v2"
}
] |
2016-10-12
|
[
[
"Kolodrubetz",
"Daniel W.",
""
],
[
"Moult",
"Ian",
""
],
[
"Stewart",
"Iain W.",
""
]
] |
On-shell helicity methods provide powerful tools for determining scattering amplitudes, which have a one-to-one correspondence with leading power helicity operators in the Soft-Collinear Effective Theory (SCET) away from singular regions of phase space. We show that helicity based operators are also useful for enumerating power suppressed SCET operators, which encode subleading amplitude information about singular limits. In particular, we present a complete set of scalar helicity building blocks that are valid for constructing operators at any order in the SCET power expansion. We also describe an interesting angular momentum selection rule that restricts how these building blocks can be assembled.
|
hep-ph/9507392
|
Tran Tuan
|
Hoang Ngoc Long, Dang Van Soa, and Tuan A. Tran
|
Electromagnetic detection of axions
|
7 pages, latex, no figures, to appear in Phys. Lett. B
|
Phys.Lett.B357:469-474,1995
|
10.1016/0370-2693(95)00907-3
|
IC/95/117
|
hep-ph
| null |
Photon-to-axion conversions in the static electromagnetic fields are
reconsidered in detail by using the Feynman diagram techniques. The
differential cross sections are presented for the conversions in the presence
of the electric field of the flat condenser as well as in the magnetic field of
the solenoid. Based on our results a laboratory experiment for the production
and the detection of the axions is described. This experiment will exploit the
axion decay constant as well as the axion mass.
|
[
{
"created": "Mon, 24 Jul 1995 12:32:10 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Long",
"Hoang Ngoc",
""
],
[
"Van Soa",
"Dang",
""
],
[
"Tran",
"Tuan A.",
""
]
] |
Photon-to-axion conversions in the static electromagnetic fields are reconsidered in detail by using the Feynman diagram techniques. The differential cross sections are presented for the conversions in the presence of the electric field of the flat condenser as well as in the magnetic field of the solenoid. Based on our results a laboratory experiment for the production and the detection of the axions is described. This experiment will exploit the axion decay constant as well as the axion mass.
|
1705.06092
|
Madhurjya Lalung
|
P. Phukan and M. Lalung and J. K. Sarma
|
NNLO solution of nonlinear GLR-MQ evolution equation to determine gluon
distribution function using Regge like ansatz
|
15 pages, 14 figures, the language is slightly changed
|
Nucl. Phys. A 968 , 275-286 (2017)
|
10.1016/j.nuclphysa.2017.09.003
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this work we have suggested a solution of the
Gribov-Levin-Ryskin-Mueller-Qiu (GLR-MQ) nonlinear evolution equation at
next-to-next-to-leading order (NNLO). The range of $Q^2$ in which we have
solved the GLR-MQ equation is Regge region of the range $5 GeV^2 \leq Q^2 \leq
25 GeV^2$ and so we have incorporated the Regge like behavior to obtain $Q^2$
evolution of gluon distribution function $G(x, Q^2)$. We have also checked the
sensitivity of our results for different values of correlation radius (R)
between two interacting gluons, viz. $R=2 GeV^{-1}$ and $R= 5 GeV^{-1}$ as well
as for different values of Regge intercept $\lambda_G$. Our computed results
are compared with those obtained by the most recent global DGLAP fits to the
parton distribution functions viz. PDF4LHC15, NNPDF3.0, HERAPDF15, CT14 and
ABM12.
|
[
{
"created": "Wed, 17 May 2017 11:12:54 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Jul 2017 05:11:02 GMT",
"version": "v2"
}
] |
2018-01-22
|
[
[
"Phukan",
"P.",
""
],
[
"Lalung",
"M.",
""
],
[
"Sarma",
"J. K.",
""
]
] |
In this work we have suggested a solution of the Gribov-Levin-Ryskin-Mueller-Qiu (GLR-MQ) nonlinear evolution equation at next-to-next-to-leading order (NNLO). The range of $Q^2$ in which we have solved the GLR-MQ equation is Regge region of the range $5 GeV^2 \leq Q^2 \leq 25 GeV^2$ and so we have incorporated the Regge like behavior to obtain $Q^2$ evolution of gluon distribution function $G(x, Q^2)$. We have also checked the sensitivity of our results for different values of correlation radius (R) between two interacting gluons, viz. $R=2 GeV^{-1}$ and $R= 5 GeV^{-1}$ as well as for different values of Regge intercept $\lambda_G$. Our computed results are compared with those obtained by the most recent global DGLAP fits to the parton distribution functions viz. PDF4LHC15, NNPDF3.0, HERAPDF15, CT14 and ABM12.
|
hep-ph/0702110
|
Zhenjun Xiao
|
Dong-Qin Guo, Xin-Fen Chen and Zhen-Jun Xiao
|
$B^0 \to \omega\eta^{(\prime)}$ and $\phi\eta^{(\prime)}$ decays in the
perturbative QCD approach
|
23 pages, 4 ps/eps figures, RevTex, typos removed, minor corrections
|
Phys.Rev.D75:054033,2007
|
10.1103/PhysRevD.75.054033
|
NJNU-TH-07-03
|
hep-ph
| null |
We calculate the branching ratios and CP-violating asymmetries for $B^0
\to\omega \eta $, $\omega \eta^\prime$, $\phi \eta$ and $\phi \eta^\prime$
decays in the perturbative QCD (pQCD) factorization approach. The pQCD
predictions for the CP-averaged branching ratios are $Br(B^0 \to \omega\eta) =
\left (2.7 ^{+1.1}_{-1.0})\times 10^{-7}$,
$Br(B^0 \to \omega \eta^\prime) = \left (0.75 ^{+0.37}_{-0.33}) \times
10^{-7}$, and
$Br(B^0 \to \phi\eta) = \left (6.3 ^{+3.3}_{-1.9}) \times 10^{-9}$,
$Br(B^0 \to \phi\eta^{\prime}) = \left (7.3^{+3.5}_{-2.6}) \times 10^{-9}$
which are consistent with currently available experimental upper limits. The
inclusion of the gluonic contribution can change the branching ratios of $B \to
\omega(\phi) \eta^\prime$ decays by about 10%. The direct CP-violating
asymmetries for $B^0 \to \omega \eta$ and $\omega \eta^\prime$ decays are
generally large in size.
|
[
{
"created": "Sun, 11 Feb 2007 08:06:54 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Mar 2007 04:28:44 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Guo",
"Dong-Qin",
""
],
[
"Chen",
"Xin-Fen",
""
],
[
"Xiao",
"Zhen-Jun",
""
]
] |
We calculate the branching ratios and CP-violating asymmetries for $B^0 \to\omega \eta $, $\omega \eta^\prime$, $\phi \eta$ and $\phi \eta^\prime$ decays in the perturbative QCD (pQCD) factorization approach. The pQCD predictions for the CP-averaged branching ratios are $Br(B^0 \to \omega\eta) = \left (2.7 ^{+1.1}_{-1.0})\times 10^{-7}$, $Br(B^0 \to \omega \eta^\prime) = \left (0.75 ^{+0.37}_{-0.33}) \times 10^{-7}$, and $Br(B^0 \to \phi\eta) = \left (6.3 ^{+3.3}_{-1.9}) \times 10^{-9}$, $Br(B^0 \to \phi\eta^{\prime}) = \left (7.3^{+3.5}_{-2.6}) \times 10^{-9}$ which are consistent with currently available experimental upper limits. The inclusion of the gluonic contribution can change the branching ratios of $B \to \omega(\phi) \eta^\prime$ decays by about 10%. The direct CP-violating asymmetries for $B^0 \to \omega \eta$ and $\omega \eta^\prime$ decays are generally large in size.
|
hep-ph/9804371
|
Tuomas P. Multamaki
|
Tuomas Multamaki, Iiro Vilja
|
Spontaneous R-Parity Violation and Electroweak Baryogenesis
|
9 pages, 1 figure
|
Phys.Lett. B433 (1998) 67-73
|
10.1016/S0370-2693(98)00660-1
|
TURKU-FL-P28-98
|
hep-ph
| null |
The possibility of baryogenesis at the electroweak phase transition is
considered within the context of a minimal supersymmetric standard model with
spontaneous R-parity violation. Provided that at least one of the sneutrino
fields acquires a large enough vacuum expectation value, a sufficient baryon
asymmetry can be created. Compared to R-parity conserving models the choice of
soft supersymmetry breaking parameters is less restricted. The observed baryon
asymmetry, n_B/s ~ 10^(-10), can be explained by this scenario and the produced
baryon-to-entropy ratio may easily be as high as n_B/s ~ 10^(-9).
|
[
{
"created": "Thu, 23 Apr 1998 12:16:08 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Multamaki",
"Tuomas",
""
],
[
"Vilja",
"Iiro",
""
]
] |
The possibility of baryogenesis at the electroweak phase transition is considered within the context of a minimal supersymmetric standard model with spontaneous R-parity violation. Provided that at least one of the sneutrino fields acquires a large enough vacuum expectation value, a sufficient baryon asymmetry can be created. Compared to R-parity conserving models the choice of soft supersymmetry breaking parameters is less restricted. The observed baryon asymmetry, n_B/s ~ 10^(-10), can be explained by this scenario and the produced baryon-to-entropy ratio may easily be as high as n_B/s ~ 10^(-9).
|
hep-ph/0601168
|
Kaushik Bhattacharya
|
Dilip Angom, Kaushik Bhattacharya, Saurabh D. Rindani
|
Decay of Spin-One Particle into Two Photons in Presence of Uniform
External Magnetic Field
|
Tex file
|
Int.J.Mod.Phys. A22 (2007) 707-720
|
10.1142/S0217751X07034416
| null |
hep-ph
| null |
Yang's theorem states that an initial J=1 state cannot decay into two
photons. Because of this result some reactions relating to elementary particles
or atomic transitions can be ruled out. The theorem is not valid in the
presence of background electric or magnetic fields. In this work we show that
the decay of a J=1 particle into two photons is permitted by Bose symmetry and
rotational invariance when the background of the decay process is not pure
vacuum but contains an external classical magnetic/electric field. We also
discuss constraints on these amplitudes from {\bf CP} invariance.
|
[
{
"created": "Fri, 20 Jan 2006 11:43:52 GMT",
"version": "v1"
}
] |
2015-06-25
|
[
[
"Angom",
"Dilip",
""
],
[
"Bhattacharya",
"Kaushik",
""
],
[
"Rindani",
"Saurabh D.",
""
]
] |
Yang's theorem states that an initial J=1 state cannot decay into two photons. Because of this result some reactions relating to elementary particles or atomic transitions can be ruled out. The theorem is not valid in the presence of background electric or magnetic fields. In this work we show that the decay of a J=1 particle into two photons is permitted by Bose symmetry and rotational invariance when the background of the decay process is not pure vacuum but contains an external classical magnetic/electric field. We also discuss constraints on these amplitudes from {\bf CP} invariance.
|
1208.5434
|
Hiroaki Abuki
|
Hiroaki Abuki, Katsuhiko Suzuki
|
Ginzburg-Landau approach to inhomogeneous chiral phases of QCD
|
5 pages, 5 eps figures. Talk presented at QCD@Work 2012:
International Workshop on QCD - Theory and Experiment, June 18-21, Lecce,
Italy
| null |
10.1063/1.4763533
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the inhomogeneous chiral condensates in the proximity of the chiral
tricritical point (TCP) of two-flavor QCD. Deriving the Ginzburg-Landau (GL)
functional up to the eighth order in the order parameter and its spatial
derivative, we explore off the TCP and find that critical curves are bent by
non-linear effects. In the newly extend GL coupling space, we find the TCP
being realized as a multicritical point where five independent critical lines
meet up. We also present general analyses for the energies associated with
several higher dimensional crystal structures.
|
[
{
"created": "Mon, 27 Aug 2012 16:26:20 GMT",
"version": "v1"
}
] |
2015-06-11
|
[
[
"Abuki",
"Hiroaki",
""
],
[
"Suzuki",
"Katsuhiko",
""
]
] |
We study the inhomogeneous chiral condensates in the proximity of the chiral tricritical point (TCP) of two-flavor QCD. Deriving the Ginzburg-Landau (GL) functional up to the eighth order in the order parameter and its spatial derivative, we explore off the TCP and find that critical curves are bent by non-linear effects. In the newly extend GL coupling space, we find the TCP being realized as a multicritical point where five independent critical lines meet up. We also present general analyses for the energies associated with several higher dimensional crystal structures.
|
hep-ph/9411250
|
Anna Jadczyk
|
Dariusz Prorok and Ludwik Turko
|
Properties of an equilibrium hadron gas subjected to the adiabatic
longitudinal expansion
|
7pages, 7 figures-- uucoded file of figures appended at the end,
separated from the paper by lines with many dashes
|
Z.Phys. C68 (1995) 315-318
|
10.1007/BF01566677
| null |
hep-ph
| null |
We consider an ideal gas of massive hadrons in thermal and chemical
equilibrium. The gas expands longitudinally in an adiabatic way. This evolution
for a baryonless gas reduces to a hydrodynamic expansion. Cooling process is
parametrized by the sound velocity. The sound velocity is temperature dependent
and is strongly influenced by hadron mass spectrum.
|
[
{
"created": "Tue, 8 Nov 1994 19:49:17 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Nov 1994 15:35:06 GMT",
"version": "v2"
}
] |
2009-10-28
|
[
[
"Prorok",
"Dariusz",
""
],
[
"Turko",
"Ludwik",
""
]
] |
We consider an ideal gas of massive hadrons in thermal and chemical equilibrium. The gas expands longitudinally in an adiabatic way. This evolution for a baryonless gas reduces to a hydrodynamic expansion. Cooling process is parametrized by the sound velocity. The sound velocity is temperature dependent and is strongly influenced by hadron mass spectrum.
|
hep-ph/9804299
|
Kim Maltman
|
Kim Maltman
|
Isospin Breaking and the Extraction of $m_s$ from the $\tau$-Decay-Like
Vector Current Sum Rule
|
6 pages, Latex, to appear in Phys. Lett. B
|
Phys.Lett. B428 (1998) 179-185
|
10.1016/S0370-2693(98)00367-0
|
YU-PP-K/M-97-10
|
hep-ph
| null |
Narison's $\tau$-decay-like sum rule for determining the strange quark mass
is re-investigated, taking into account isospin-breaking corrections in the
extraction of the input spectral functions from $e^+e^-\to hadrons$ data. The
corrections, estimated using experimental data on vector meson electromagnetic
decay constants and a QCD sum rule analysis of the 38 vector current
correlator, are shown to be especially large for the isoscalar case. The reason
such large corrections are natural is also explained. Due to the high degree of
cancellation in the original sum rule, the effect of these corrections on the
determination of $m_s$ is significant. A new central value $m_s=113-138 MeV$ is
found, in the $\bar{MS}$ scheme at 1 GeV$^2$, with significant (asymmetric)
errors associated with errors in the input experimental data.
|
[
{
"created": "Wed, 15 Apr 1998 15:39:13 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Maltman",
"Kim",
""
]
] |
Narison's $\tau$-decay-like sum rule for determining the strange quark mass is re-investigated, taking into account isospin-breaking corrections in the extraction of the input spectral functions from $e^+e^-\to hadrons$ data. The corrections, estimated using experimental data on vector meson electromagnetic decay constants and a QCD sum rule analysis of the 38 vector current correlator, are shown to be especially large for the isoscalar case. The reason such large corrections are natural is also explained. Due to the high degree of cancellation in the original sum rule, the effect of these corrections on the determination of $m_s$ is significant. A new central value $m_s=113-138 MeV$ is found, in the $\bar{MS}$ scheme at 1 GeV$^2$, with significant (asymmetric) errors associated with errors in the input experimental data.
|
1503.02183
|
Alexei Smirnov Yu
|
A. N. Ioannisian, A. Yu. Smirnov, D. Wyler
|
Oscillations of the $^7$Be solar neutrinos inside the Earth
|
14 pages, 6 figures, LaTeX
|
Phys. Rev. D 92, 013014 (2015)
|
10.1103/PhysRevD.92.013014
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We explore in detail oscillations of the solar $^7$Be neutrinos in the matter
of the Earth. The depth of oscillations is about $(0.1 - 0.2)\%$ and the length
$\approx 30$ km. The period of the oscillatory modulations in the energy scale
is comparable with the width of the line determined by the temperature in the
center of the Sun. The latter means that depending on the length of trajectory
(nadir angle) one obtains different degree of averaging of oscillations.
Exploring these oscillations it is possible to measure the width of the $^7$Be
line and therefore the temperature of the Sun, determine precisely $\Delta
m^2_{21}$, perform tomography of the Earth, in particular, measure the
deviation of its form from sphere, and detect small structures. Studies of the
Be neutrinos open up a possibility to test quantum mechanics of neutrino
oscillations and search for the sterile neutrinos. Accuracy of these
measurements with future scintillator (or scintillator uploaded) detectors of
the $\sim 100$ kton mass scale is estimated.
|
[
{
"created": "Sat, 7 Mar 2015 14:57:47 GMT",
"version": "v1"
}
] |
2015-08-05
|
[
[
"Ioannisian",
"A. N.",
""
],
[
"Smirnov",
"A. Yu.",
""
],
[
"Wyler",
"D.",
""
]
] |
We explore in detail oscillations of the solar $^7$Be neutrinos in the matter of the Earth. The depth of oscillations is about $(0.1 - 0.2)\%$ and the length $\approx 30$ km. The period of the oscillatory modulations in the energy scale is comparable with the width of the line determined by the temperature in the center of the Sun. The latter means that depending on the length of trajectory (nadir angle) one obtains different degree of averaging of oscillations. Exploring these oscillations it is possible to measure the width of the $^7$Be line and therefore the temperature of the Sun, determine precisely $\Delta m^2_{21}$, perform tomography of the Earth, in particular, measure the deviation of its form from sphere, and detect small structures. Studies of the Be neutrinos open up a possibility to test quantum mechanics of neutrino oscillations and search for the sterile neutrinos. Accuracy of these measurements with future scintillator (or scintillator uploaded) detectors of the $\sim 100$ kton mass scale is estimated.
|
1808.02789
|
Arpan Das
|
Jitesh R. Bhatt, Arpan Das, Hiranmaya Mishra
|
Thermoelectric effect and Seebeck coefficient for hot and dense hadronic
matter
|
13 pages, 4 figures, Introduction and result section are updated for
better presentation, accepted as a regular article in Physics Review D
|
Phys. Rev. D 99, 014015 (2019)
|
10.1103/PhysRevD.99.014015
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the thermoelectric effect for baryon rich plasma produced in
heavy ion collision experiments. We estimate the associated Seebeck coefficient
for the hadronic matter. Using kinetic theory within relaxation time
approximation we calculate the Seebeck coefficient of a hadronic medium with a
temperature gradient. The calculation is performed for hadronic matter modeled
by hadron resonance gas model with hadrons and resonance states up to a cutoff
in the mass as 2.25 GeV. We argue that the thermoelectric current produced by
such effect can produce magnetic field in heavy ion collision experiments.
|
[
{
"created": "Wed, 8 Aug 2018 14:14:28 GMT",
"version": "v1"
},
{
"created": "Sun, 26 Aug 2018 17:40:06 GMT",
"version": "v2"
},
{
"created": "Fri, 11 Jan 2019 05:53:20 GMT",
"version": "v3"
}
] |
2019-01-16
|
[
[
"Bhatt",
"Jitesh R.",
""
],
[
"Das",
"Arpan",
""
],
[
"Mishra",
"Hiranmaya",
""
]
] |
We investigate the thermoelectric effect for baryon rich plasma produced in heavy ion collision experiments. We estimate the associated Seebeck coefficient for the hadronic matter. Using kinetic theory within relaxation time approximation we calculate the Seebeck coefficient of a hadronic medium with a temperature gradient. The calculation is performed for hadronic matter modeled by hadron resonance gas model with hadrons and resonance states up to a cutoff in the mass as 2.25 GeV. We argue that the thermoelectric current produced by such effect can produce magnetic field in heavy ion collision experiments.
|
1105.0530
|
Werner Bernreuther
|
Werner Bernreuther, Christian Bogner, Oliver Dekkers
|
The real radiation antenna function for $S \to Q {\bar Q} q {\bar q}$ at
NNLO QCD
|
Latex, 32 pages
| null |
10.1007/JHEP06(2011)032
|
TTK-11-13
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
As a first step towards the application of the antenna subtraction formalism
to NNLO QCD reactions with massive quarks, we determine the real radiation
antenna function and its integrated counterpart for reactions of the type $S
\to Q{\bar Q} q {\bar q}$, where $S$ denotes an uncolored initial state and
$Q$, $q$ a massive and massless quark, respectively. We compute the
corresponding integrated antenna function in terms of harmonic polylogarithms.
As an application and check of our results we calculate the contribution
proportional to $\alpha_s^2 e^2_Q N_f$ to the inclusive heavy-quark pair
production cross ection in $e^+e^-$ annihilation.
|
[
{
"created": "Tue, 3 May 2011 10:04:55 GMT",
"version": "v1"
}
] |
2015-05-28
|
[
[
"Bernreuther",
"Werner",
""
],
[
"Bogner",
"Christian",
""
],
[
"Dekkers",
"Oliver",
""
]
] |
As a first step towards the application of the antenna subtraction formalism to NNLO QCD reactions with massive quarks, we determine the real radiation antenna function and its integrated counterpart for reactions of the type $S \to Q{\bar Q} q {\bar q}$, where $S$ denotes an uncolored initial state and $Q$, $q$ a massive and massless quark, respectively. We compute the corresponding integrated antenna function in terms of harmonic polylogarithms. As an application and check of our results we calculate the contribution proportional to $\alpha_s^2 e^2_Q N_f$ to the inclusive heavy-quark pair production cross ection in $e^+e^-$ annihilation.
|
hep-ph/9604386
|
Martina Brisudova
|
Martina Brisudova
|
Bound state studies in light-front QCD of mesons containing at least one
heavy quark
|
5 pages. Contribution to the proceedings of Hadron Structure 96,
Slovakia, Feb. 1996. Companion paper to hep-ph/9604318 by Robert Perry
| null | null | null |
hep-ph
| null |
We present a QCD bound-state calculation based on a renormalization
group-improved light-front Hamiltonian formalism. The QCD Hamiltonian is
determined to second order in the coupling, and it includes two-body confining
interactions. We make a momentum expansion, obtaining an equal-time-like
Schrodinger equation. This is solved for quark-antiquark constituent states,
and we obtain a set of self-consistent parameters by fitting B mesons. Applying
the approach to charmonium spectra leads to a prediction of the hyperfine
splitting between J/$\psi$(1S) and $\eta_c$(1S) which is in good agreement with
experiment.
|
[
{
"created": "Mon, 22 Apr 1996 19:36:12 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Brisudova",
"Martina",
""
]
] |
We present a QCD bound-state calculation based on a renormalization group-improved light-front Hamiltonian formalism. The QCD Hamiltonian is determined to second order in the coupling, and it includes two-body confining interactions. We make a momentum expansion, obtaining an equal-time-like Schrodinger equation. This is solved for quark-antiquark constituent states, and we obtain a set of self-consistent parameters by fitting B mesons. Applying the approach to charmonium spectra leads to a prediction of the hyperfine splitting between J/$\psi$(1S) and $\eta_c$(1S) which is in good agreement with experiment.
|
2007.02087
|
Alexander Ilyichev Dr.
|
A. Afanasev, A. Ilyichev
|
Contribution of hard photon emission to charge asymmetry in elastic
(anti)lepton-proton scattering
|
7 pages, 4 figures
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The influence of the hard photon emission on the charge asymmetry in the
(anti)lepton-proton elastic scattering was evaluated for the first time beyond
the ultrarelativistic limit, while retaining the lepton mass at all steps of
the calculation. This contribution - responsible for the charge asymmetry - is
induced by interference between real photon emission from the lepton and
proton. During the calculation any excited states of the intermediated proton
are not considered, allowing us to use the standard fermionic propagator for
this particle. The infrared divergence extracted using Lorenz-invariant
approach of Bardin-Shumeiko is canceled by the corresponding soft part of the
two-photon exchange contribution. Numerical analysis was performed within
kinematic conditions of Jefferson Lab measurements and MUSE experiment in PSI.
|
[
{
"created": "Sat, 4 Jul 2020 12:39:00 GMT",
"version": "v1"
},
{
"created": "Sat, 6 Feb 2021 09:47:08 GMT",
"version": "v2"
}
] |
2021-02-09
|
[
[
"Afanasev",
"A.",
""
],
[
"Ilyichev",
"A.",
""
]
] |
The influence of the hard photon emission on the charge asymmetry in the (anti)lepton-proton elastic scattering was evaluated for the first time beyond the ultrarelativistic limit, while retaining the lepton mass at all steps of the calculation. This contribution - responsible for the charge asymmetry - is induced by interference between real photon emission from the lepton and proton. During the calculation any excited states of the intermediated proton are not considered, allowing us to use the standard fermionic propagator for this particle. The infrared divergence extracted using Lorenz-invariant approach of Bardin-Shumeiko is canceled by the corresponding soft part of the two-photon exchange contribution. Numerical analysis was performed within kinematic conditions of Jefferson Lab measurements and MUSE experiment in PSI.
|
2311.08457
|
Mohamed Younes Sassi
|
Mohamed Younes Sassi, Gudrid Moortgat-Pick
|
SM fermion scattering off electric charge and CP-violating domain walls
in the 2HDM
|
7 pages, 3 figures, Contribution to the proceedings of the European
Physical Society Conference on High Energy Physics (EPS-HEP2023), 21-25
August 2023, Hamburg, Germany
| null | null |
DESY-23-173
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In several models of beyond Standard Model physics (BSM) discrete symmetries
play an important role. For instance, in order to avoid flavor changing neutral
currents (FCNC), a discrete $Z_2$ symmetry is imposed on
Two-Higgs-Doublet-Models (2HDM). This can lead to the formation of domain walls
(DW) as the $Z_2$ symmetry gets spontaneously broken during electroweak
symmetry breaking (EWSB) in the early universe. Due to this simultaneous
spontaneous breaking of both the discrete symmetry and the electroweak
symmetry, the vacuum manifold has the structure of two disconnected 3-spheres
and the formed domain walls can exhibit several special properties in contrast
to standard domain walls. We focus on some of these properties such as CP and
electric charge violating vacua localized inside the domain walls. The breaking
of $U(1)_{em}$ inside the wall leads to the known phenomenon of
"clash-of-symmetries" mechanism, meaning that the symmetry group inside the
wall is smaller than the symmetry group far from the wall. We also discuss the
scattering of top quarks off such types of domain walls and show, for example,
that they can be reflected or transmitted off the wall as a bottom quark.
|
[
{
"created": "Tue, 14 Nov 2023 19:00:02 GMT",
"version": "v1"
}
] |
2023-11-16
|
[
[
"Sassi",
"Mohamed Younes",
""
],
[
"Moortgat-Pick",
"Gudrid",
""
]
] |
In several models of beyond Standard Model physics (BSM) discrete symmetries play an important role. For instance, in order to avoid flavor changing neutral currents (FCNC), a discrete $Z_2$ symmetry is imposed on Two-Higgs-Doublet-Models (2HDM). This can lead to the formation of domain walls (DW) as the $Z_2$ symmetry gets spontaneously broken during electroweak symmetry breaking (EWSB) in the early universe. Due to this simultaneous spontaneous breaking of both the discrete symmetry and the electroweak symmetry, the vacuum manifold has the structure of two disconnected 3-spheres and the formed domain walls can exhibit several special properties in contrast to standard domain walls. We focus on some of these properties such as CP and electric charge violating vacua localized inside the domain walls. The breaking of $U(1)_{em}$ inside the wall leads to the known phenomenon of "clash-of-symmetries" mechanism, meaning that the symmetry group inside the wall is smaller than the symmetry group far from the wall. We also discuss the scattering of top quarks off such types of domain walls and show, for example, that they can be reflected or transmitted off the wall as a bottom quark.
|
hep-ph/0312292
|
Harry Lipkin J.
|
Harry J. Lipkin (Weizmann Institute, Tel Aviv University, Argonne)
|
Quantum Mechanics of Neutrino Detectors Determine Coherence and Phases
in Oscillation Experiments
|
4 pages
| null | null | null |
hep-ph
| null |
The apparent symmetry between energy and momentum found in all covariant
descriptions of neutrino oscillations is destroyed in the neutrino detector, a
quantum mechanical system described by a density matrix diagonal in energy but
not in momentum. The off diagonal matrix elements between states of different
momenta and the same energy produce the coherence and interference between mass
eigenstates having the same energy and different momenta that produce
oscillations.
|
[
{
"created": "Sat, 20 Dec 2003 09:23:26 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Lipkin",
"Harry J.",
"",
"Weizmann Institute, Tel Aviv University, Argonne"
]
] |
The apparent symmetry between energy and momentum found in all covariant descriptions of neutrino oscillations is destroyed in the neutrino detector, a quantum mechanical system described by a density matrix diagonal in energy but not in momentum. The off diagonal matrix elements between states of different momenta and the same energy produce the coherence and interference between mass eigenstates having the same energy and different momenta that produce oscillations.
|
0711.2956
|
Ronny Thomas
|
R. Thomas, T. Hilger, B. Kampfer
|
Role of Four-Quark Condensates in QCD Sum Rules
|
Invited talk at International School of Nuclear Physics, 29th Course,
Quarks in Hadrons and Nuclei, Erice, Sicily, 16 - 24 Sep 2007
|
Prog.Part.Nucl.Phys.61:297-303,2008
|
10.1016/j.ppnp.2007.12.028
| null |
hep-ph nucl-th
| null |
The QCD sum rule approach to the in-medium behavior of hadrons is discussed
for omega meson, nucleon and D meson. Emphasis is devoted to the impact of
four-quark condensates and to order parameters of spontaneous symmetry
breaking.
|
[
{
"created": "Mon, 19 Nov 2007 15:33:34 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Thomas",
"R.",
""
],
[
"Hilger",
"T.",
""
],
[
"Kampfer",
"B.",
""
]
] |
The QCD sum rule approach to the in-medium behavior of hadrons is discussed for omega meson, nucleon and D meson. Emphasis is devoted to the impact of four-quark condensates and to order parameters of spontaneous symmetry breaking.
|
1612.01679
|
Qiang Fu
|
Qiang Fu, Xurong Chen
|
Coherent photoproductions of $J/\Psi$ and $\Upsilon$ mesons in pp and
PbPb ultraperipheral collisions from dynamical gluon distribution
|
5 pages, 8 figures
| null |
10.1088/1674-1137/41/11/114105
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present calculations of coherent photoproduction of vector mesons
($J/\Psi$ and $\Upsilon$) with leading-order parton distribution functions to
check new kinds of corrections of the DGLAP equations and nuclear
modifications. The input gluon distribution of the proton is the dynamical
parton model from the DGLAP equations with GLR-MQ-ZRS (Gribov-Levin-Ryskin,
Mueller-Qiu, Zhu-Ruan-Shen) modifications. From comparison between several
other gluon distribution models, we find that the dynamical gluon distribution
fits with the results of meson photoproduction experiments in the high energy
region. The calculation of the differential cross sections using dynamical and
other gluon distributions is compared with the experimental data from the HERA,
ZEUS and LHCb Collaborations. Although there is little data for the rapidity
distribution of vector meson photoproduction near zero rapidity, the dynamical
gluon distribution works well with the data in the large rapidity region.
|
[
{
"created": "Tue, 6 Dec 2016 06:17:30 GMT",
"version": "v1"
},
{
"created": "Thu, 15 Dec 2016 10:13:17 GMT",
"version": "v2"
},
{
"created": "Mon, 19 Dec 2016 02:31:15 GMT",
"version": "v3"
},
{
"created": "Wed, 14 Jun 2017 08:49:02 GMT",
"version": "v4"
},
{
"created": "Wed, 6 Sep 2017 06:03:50 GMT",
"version": "v5"
},
{
"created": "Mon, 2 Oct 2017 16:00:24 GMT",
"version": "v6"
}
] |
2017-10-03
|
[
[
"Fu",
"Qiang",
""
],
[
"Chen",
"Xurong",
""
]
] |
We present calculations of coherent photoproduction of vector mesons ($J/\Psi$ and $\Upsilon$) with leading-order parton distribution functions to check new kinds of corrections of the DGLAP equations and nuclear modifications. The input gluon distribution of the proton is the dynamical parton model from the DGLAP equations with GLR-MQ-ZRS (Gribov-Levin-Ryskin, Mueller-Qiu, Zhu-Ruan-Shen) modifications. From comparison between several other gluon distribution models, we find that the dynamical gluon distribution fits with the results of meson photoproduction experiments in the high energy region. The calculation of the differential cross sections using dynamical and other gluon distributions is compared with the experimental data from the HERA, ZEUS and LHCb Collaborations. Although there is little data for the rapidity distribution of vector meson photoproduction near zero rapidity, the dynamical gluon distribution works well with the data in the large rapidity region.
|
2211.10683
|
Aidos Issadykov
|
Aidos Issadykov and Mikhail A. Ivanov
|
$B \to K^{(\ast)} \nu \bar{\nu}$ in covariant confined quark model
|
12 pages, 9 figures
| null |
10.1142/S0217732323500062
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the $B \to K^{(\ast)} \nu \bar{\nu}$ decays within the Standard
Model (SM) by using the relevant transition form factors obtained from the
covariant confined quark model (CCQM) developed by us. The $B \to K$ and $B\to
K^\ast$ transition form factors are calculated in the full kinematic $q^2$
range. The branching fractions are then calculated. It is shown that our
results are in an agreement with those obtained in other theoretical
approaches. Currently, the Babar and Belle collaborations provide us by the
upper limits at 90\% confidence limit. The obtained bounds are roughly an order
of magnitude larger than the SM predictions. This should stimulate experimental
collaborations to set up experiments that allow one to obtain more accurate
branching values, which is quite achievable on the updated LHCb and Belle
machines. If the discrepancies between theory and experiment are confirmed,
this will open up opportunities for constructing models with new particles and
interactions leading to an extension of the SM.
|
[
{
"created": "Sat, 19 Nov 2022 12:44:53 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Dec 2022 22:00:54 GMT",
"version": "v2"
}
] |
2023-05-17
|
[
[
"Issadykov",
"Aidos",
""
],
[
"Ivanov",
"Mikhail A.",
""
]
] |
We study the $B \to K^{(\ast)} \nu \bar{\nu}$ decays within the Standard Model (SM) by using the relevant transition form factors obtained from the covariant confined quark model (CCQM) developed by us. The $B \to K$ and $B\to K^\ast$ transition form factors are calculated in the full kinematic $q^2$ range. The branching fractions are then calculated. It is shown that our results are in an agreement with those obtained in other theoretical approaches. Currently, the Babar and Belle collaborations provide us by the upper limits at 90\% confidence limit. The obtained bounds are roughly an order of magnitude larger than the SM predictions. This should stimulate experimental collaborations to set up experiments that allow one to obtain more accurate branching values, which is quite achievable on the updated LHCb and Belle machines. If the discrepancies between theory and experiment are confirmed, this will open up opportunities for constructing models with new particles and interactions leading to an extension of the SM.
|
hep-ph/0008203
|
Chi-Sing Lam
|
C.S. Lam (McGill University)
|
Consequences of a Z_2 Symmetry for Neutrino Oscillation
|
7 pages, no figures
| null | null | null |
hep-ph
| null |
A $Z_{2L}\times Z_{2R}$ generation symmetry in the neutrino sector predicts
the atmospheric neutrino mixing to be maximal, and the MNS matrix element
$U_{e3}$ to be zero, consistent with observations. Solar neutrino mixing may be
maximal but is not required by the symmetry. Neutrino masses of the first two
generations are predicted to vanish, providing a first approximation to the
oscillation data. The consequence of a smaller $Z_2$ symmetry is also
discussed. In that case, deviation from the $Z_{2L}\times Z_{2R}$ result is of
the order of the neutrino mass ratio between the first two generations and the
third generation.
|
[
{
"created": "Fri, 18 Aug 2000 15:44:08 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Lam",
"C. S.",
"",
"McGill University"
]
] |
A $Z_{2L}\times Z_{2R}$ generation symmetry in the neutrino sector predicts the atmospheric neutrino mixing to be maximal, and the MNS matrix element $U_{e3}$ to be zero, consistent with observations. Solar neutrino mixing may be maximal but is not required by the symmetry. Neutrino masses of the first two generations are predicted to vanish, providing a first approximation to the oscillation data. The consequence of a smaller $Z_2$ symmetry is also discussed. In that case, deviation from the $Z_{2L}\times Z_{2R}$ result is of the order of the neutrino mass ratio between the first two generations and the third generation.
|
1904.06641
|
Yin Huang
|
HongQiang Zhu, Yin Huang
|
Production of the $D_{s0}(2317)$ and $D_{s1}(2460)$ by kaon-induced
reactions on a proton target
| null |
Phys. Rev. D 100, 054031 (2019)
|
10.1103/PhysRevD.100.054031
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the possibility to study the charmed-strange mesons
$D_{s0}(2317)$ and $D_{s1}(2460)$ by kaon-induced reactions on a proton target
in an effective Lagrangian approach. The production process is described by the
$t$-channel $D^{0}$ and $D^{*0}$ exchanges, respectively. Our theoretical
approach is based on the chiral unitary theory where the $D_{s0}(2317)$ and
$D_{s1}(2460)$ resonances are dynamically generated. Within the coupling
constants of the $D_{s0}(2317)$ to $KD$ and $D_{s1}(2460)$ to $KD^{*}$ channels
obtained from the chiral unitary theory, the total and differential cross
sections of the $K^{-}p\to{}\Lambda_cD_{s0}(2317)$ and
$K^{-}p\to{}\Lambda_cD_{s1}(2460)$ are evaluated. The $\bar{K}p$ initial state
interaction mediated by Pomeron and Reggeon exchanges is also included, which
reduces the production cross sections of the $D_{s0}(2317)$ and $D_{s1}(2460)$.
If measured in future experiments, the predicted total cross sections and
specific features of the angular distributions can be used to test the
(molecular) nature of the $D_{s0}(2317)$ and $D_{s1}(2460)$.
|
[
{
"created": "Sun, 14 Apr 2019 07:15:04 GMT",
"version": "v1"
}
] |
2019-10-02
|
[
[
"Zhu",
"HongQiang",
""
],
[
"Huang",
"Yin",
""
]
] |
We investigate the possibility to study the charmed-strange mesons $D_{s0}(2317)$ and $D_{s1}(2460)$ by kaon-induced reactions on a proton target in an effective Lagrangian approach. The production process is described by the $t$-channel $D^{0}$ and $D^{*0}$ exchanges, respectively. Our theoretical approach is based on the chiral unitary theory where the $D_{s0}(2317)$ and $D_{s1}(2460)$ resonances are dynamically generated. Within the coupling constants of the $D_{s0}(2317)$ to $KD$ and $D_{s1}(2460)$ to $KD^{*}$ channels obtained from the chiral unitary theory, the total and differential cross sections of the $K^{-}p\to{}\Lambda_cD_{s0}(2317)$ and $K^{-}p\to{}\Lambda_cD_{s1}(2460)$ are evaluated. The $\bar{K}p$ initial state interaction mediated by Pomeron and Reggeon exchanges is also included, which reduces the production cross sections of the $D_{s0}(2317)$ and $D_{s1}(2460)$. If measured in future experiments, the predicted total cross sections and specific features of the angular distributions can be used to test the (molecular) nature of the $D_{s0}(2317)$ and $D_{s1}(2460)$.
|
2107.00030
|
Tomas Gonzalo
|
Sanjay Bloor, Tom\'as E. Gonzalo, Pat Scott, Christopher Chang, Are
Raklev, Jos\'e Eliel Camargo-Molina, Anders Kvellestad, Janina J. Renk, Peter
Athron, Csaba Bal\'azs
|
The GAMBIT Universal Model Machine: from Lagrangians to Likelihoods
|
32 pages, 6 figures, 3 tables
|
Eur. Phys. J. C 81, 1103 (2021)
|
10.1140/epjc/s10052-021-09828-9
|
TTK-21-24, gambit-code-2021
|
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We introduce the GAMBIT Universal Model Machine (GUM), a tool for
automatically generating code for the global fitting software framework GAMBIT,
based on Lagrangian-level inputs. GUM accepts models written symbolically in
FeynRules and SARAH formats, and can use either tool along with MadGraph and
CalcHEP to generate GAMBIT model, collider, dark matter, decay and spectrum
code, as well as GAMBIT interfaces to corresponding versions of SPheno,
micrOMEGAs, Pythia and Vevacious (C++). In this paper we describe the features,
methods, usage, pathways, assumptions and current limitations of GUM. We also
give a fully worked example, consisting of the addition of a Majorana fermion
simplified dark matter model with a scalar mediator to GAMBIT via GUM, and
carry out a corresponding fit.
|
[
{
"created": "Wed, 30 Jun 2021 18:00:22 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Jul 2021 09:57:53 GMT",
"version": "v2"
},
{
"created": "Wed, 15 Dec 2021 10:13:23 GMT",
"version": "v3"
}
] |
2022-05-13
|
[
[
"Bloor",
"Sanjay",
""
],
[
"Gonzalo",
"Tomás E.",
""
],
[
"Scott",
"Pat",
""
],
[
"Chang",
"Christopher",
""
],
[
"Raklev",
"Are",
""
],
[
"Camargo-Molina",
"José Eliel",
""
],
[
"Kvellestad",
"Anders",
""
],
[
"Renk",
"Janina J.",
""
],
[
"Athron",
"Peter",
""
],
[
"Balázs",
"Csaba",
""
]
] |
We introduce the GAMBIT Universal Model Machine (GUM), a tool for automatically generating code for the global fitting software framework GAMBIT, based on Lagrangian-level inputs. GUM accepts models written symbolically in FeynRules and SARAH formats, and can use either tool along with MadGraph and CalcHEP to generate GAMBIT model, collider, dark matter, decay and spectrum code, as well as GAMBIT interfaces to corresponding versions of SPheno, micrOMEGAs, Pythia and Vevacious (C++). In this paper we describe the features, methods, usage, pathways, assumptions and current limitations of GUM. We also give a fully worked example, consisting of the addition of a Majorana fermion simplified dark matter model with a scalar mediator to GAMBIT via GUM, and carry out a corresponding fit.
|
2211.13423
|
Derek Leinweber
|
Derek B. Leinweber and Anthony W. Thomas (CSSM, University of
Adelaide)
|
Sea-quark loop contributions to the $\bar d$-$\bar u$ asymmetry in the
proton
|
6 pages, 1 four-panel figure. Manuscript accepted for publication in
Phys. Rev. D Letters
| null | null |
ADP-22-33/T1204
|
hep-ph hep-lat nucl-th
|
http://creativecommons.org/licenses/by-sa/4.0/
|
QCD interactions for equal-mass fermion flavors are flavor blind. This fact
is often used to state that disconnected sea-quark loop contributions are equal
for $u$ and $d$ quarks in the mass symmetric case and therefore these
disconnected sea-quark loop contributions cannot contribute to the well-known
$\bar d - \bar u$ asymmetry in the proton. Instead, it is argued that one must
look to the connected sector of lattice QCD correlation functions to find this
difference. In this presentation, we note that these statements are true
provided unphysical contributions in the sea-quark loop sector are included,
contributions from baryons that do not appear in the physical spectrum. To
respect the Pauli principle, these unphysical contributions from the
disconnected sea-quark loop sector must cancel equally unphysical contributions
in the connected sector. The remaining disconnected sea-quark loop
contributions no longer have a balance between $\bar d$ and $\bar u$. Upon
considering only physically observed baryons in the loop contributions, we
illustrate an important contribution from the sea-quark loop sector to $\bar d
- \bar u$ that enhances the leading connected contribution by 12\%.
|
[
{
"created": "Thu, 24 Nov 2022 05:36:45 GMT",
"version": "v1"
},
{
"created": "Sat, 3 Feb 2024 04:54:50 GMT",
"version": "v2"
}
] |
2024-02-06
|
[
[
"Leinweber",
"Derek B.",
"",
"CSSM, University of\n Adelaide"
],
[
"Thomas",
"Anthony W.",
"",
"CSSM, University of\n Adelaide"
]
] |
QCD interactions for equal-mass fermion flavors are flavor blind. This fact is often used to state that disconnected sea-quark loop contributions are equal for $u$ and $d$ quarks in the mass symmetric case and therefore these disconnected sea-quark loop contributions cannot contribute to the well-known $\bar d - \bar u$ asymmetry in the proton. Instead, it is argued that one must look to the connected sector of lattice QCD correlation functions to find this difference. In this presentation, we note that these statements are true provided unphysical contributions in the sea-quark loop sector are included, contributions from baryons that do not appear in the physical spectrum. To respect the Pauli principle, these unphysical contributions from the disconnected sea-quark loop sector must cancel equally unphysical contributions in the connected sector. The remaining disconnected sea-quark loop contributions no longer have a balance between $\bar d$ and $\bar u$. Upon considering only physically observed baryons in the loop contributions, we illustrate an important contribution from the sea-quark loop sector to $\bar d - \bar u$ that enhances the leading connected contribution by 12\%.
|
hep-ph/0210077
|
D. J. Miller
|
S. Y. Choi, D. J. Miller, M. M. Muhlleitner, P. M. Zerwas
|
Identifying the Higgs Spin and Parity in Decays to Z Pairs
|
14 pages, 2 postscript figures
|
Phys.Lett.B553:61-71,2003
|
10.1016/S0370-2693(02)03191-X
|
CERN-TH/2002-231, DESY 02-150, PM/02-26
|
hep-ph hep-ex
| null |
Higgs decays to Z boson pairs may be exploited to determine spin and parity
of the Higgs boson, a method complementary to spin-parity measurements in
Higgs-strahlung. For a Higgs mass above the on-shell ZZ decay threshold, a
model-independent analysis can be performed, but only by making use of
additional angular correlation effects in gluon-gluon fusion at the LHC and
gamma-gamma fusion at linear colliders. In the intermediate mass range, in
which the Higgs boson decays into pairs of real and virtual Z bosons, threshold
effects and angular correlations, parallel to Higgs-strahlung, may be adopted
to determine spin and parity, though high event rates will be required for the
analysis in practice.
|
[
{
"created": "Fri, 4 Oct 2002 13:40:47 GMT",
"version": "v1"
}
] |
2009-04-13
|
[
[
"Choi",
"S. Y.",
""
],
[
"Miller",
"D. J.",
""
],
[
"Muhlleitner",
"M. M.",
""
],
[
"Zerwas",
"P. M.",
""
]
] |
Higgs decays to Z boson pairs may be exploited to determine spin and parity of the Higgs boson, a method complementary to spin-parity measurements in Higgs-strahlung. For a Higgs mass above the on-shell ZZ decay threshold, a model-independent analysis can be performed, but only by making use of additional angular correlation effects in gluon-gluon fusion at the LHC and gamma-gamma fusion at linear colliders. In the intermediate mass range, in which the Higgs boson decays into pairs of real and virtual Z bosons, threshold effects and angular correlations, parallel to Higgs-strahlung, may be adopted to determine spin and parity, though high event rates will be required for the analysis in practice.
|
2203.06508
|
Daniel Carney
|
Daniel Carney, Nirmal Raj, Yang Bai, Joshua Berger, Carlos Blanco,
Joseph Bramante, Christopher Cappiello, Ma\'ira Dutra, Reza Ebadi, Kristi
Engel, Edward Kolb, J. Patrick Harding, Jason Kumar, Gordan Krnjaic, Rafael
F. Lang, Rebecca K. Leane, Benjamin V. Lehmann, Shengchao Li, Andrew J. Long,
Gopolang Mohlabeng, Ibles Olcina, Elisa Pueschel, Nicholas L. Rodd, Carsten
Rott, Dipan Sengupta, Bibhushan Shakya, Ronald L. Walsworth, and Shawn
Westerdale
|
Snowmass2021 Cosmic Frontier White Paper: Ultraheavy particle dark
matter
|
Solicited community whitepaper for the Snowmass2021 process (Cosmic
frontier, particle dark matter working group). 10 pages, 3 figures, many
references. Comments welcome. v2: minor revisions based on comments
|
SciPost Phys. Core 6, 075 (2023), published 6 November 2023
|
10.21468/SciPostPhysCore.6.4.075
| null |
hep-ph astro-ph.CO hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
We outline the unique opportunities and challenges in the search for
"ultraheavy" dark matter candidates with masses between roughly $10~{\rm TeV}$
and the Planck scale $m_{\rm pl} \approx 10^{16}~{\rm TeV}$. This mass range
presents a wide and relatively unexplored dark matter parameter space, with a
rich space of possible models and cosmic histories. We emphasize that both
current detectors and new, targeted search techniques, via both direct and
indirect detection, are poised to contribute to searches for ultraheavy
particle dark matter in the coming decade. We highlight the need for new
developments in this space, including new analyses of current and imminent
direct and indirect experiments targeting ultraheavy dark matter and
development of new, ultra-sensitive detector technologies like next-generation
liquid noble detectors, neutrino experiments, and specialized quantum sensing
techniques.
|
[
{
"created": "Sat, 12 Mar 2022 20:09:53 GMT",
"version": "v1"
},
{
"created": "Thu, 27 Apr 2023 10:37:37 GMT",
"version": "v2"
}
] |
2023-11-14
|
[
[
"Carney",
"Daniel",
""
],
[
"Raj",
"Nirmal",
""
],
[
"Bai",
"Yang",
""
],
[
"Berger",
"Joshua",
""
],
[
"Blanco",
"Carlos",
""
],
[
"Bramante",
"Joseph",
""
],
[
"Cappiello",
"Christopher",
""
],
[
"Dutra",
"Maíra",
""
],
[
"Ebadi",
"Reza",
""
],
[
"Engel",
"Kristi",
""
],
[
"Kolb",
"Edward",
""
],
[
"Harding",
"J. Patrick",
""
],
[
"Kumar",
"Jason",
""
],
[
"Krnjaic",
"Gordan",
""
],
[
"Lang",
"Rafael F.",
""
],
[
"Leane",
"Rebecca K.",
""
],
[
"Lehmann",
"Benjamin V.",
""
],
[
"Li",
"Shengchao",
""
],
[
"Long",
"Andrew J.",
""
],
[
"Mohlabeng",
"Gopolang",
""
],
[
"Olcina",
"Ibles",
""
],
[
"Pueschel",
"Elisa",
""
],
[
"Rodd",
"Nicholas L.",
""
],
[
"Rott",
"Carsten",
""
],
[
"Sengupta",
"Dipan",
""
],
[
"Shakya",
"Bibhushan",
""
],
[
"Walsworth",
"Ronald L.",
""
],
[
"Westerdale",
"Shawn",
""
]
] |
We outline the unique opportunities and challenges in the search for "ultraheavy" dark matter candidates with masses between roughly $10~{\rm TeV}$ and the Planck scale $m_{\rm pl} \approx 10^{16}~{\rm TeV}$. This mass range presents a wide and relatively unexplored dark matter parameter space, with a rich space of possible models and cosmic histories. We emphasize that both current detectors and new, targeted search techniques, via both direct and indirect detection, are poised to contribute to searches for ultraheavy particle dark matter in the coming decade. We highlight the need for new developments in this space, including new analyses of current and imminent direct and indirect experiments targeting ultraheavy dark matter and development of new, ultra-sensitive detector technologies like next-generation liquid noble detectors, neutrino experiments, and specialized quantum sensing techniques.
|
hep-ph/0312203
|
Alessandro Strumia
|
Thomas Hambye, Yin Lin, Alessio Notari, Michele Papucci, Alessandro
Strumia
|
Constraints on neutrino masses from leptogenesis models
|
16 pages, 6 figures
|
Nucl.Phys.B695:169-191,2004
|
10.1016/j.nuclphysb.2004.06.027
|
IFUP-TH/2003-48
|
hep-ph
| null |
Upper bounds on the CP asymmetry relevant for leptogenesis are reexamined and
found weaker than in previous literature, both for hierarchical and for
quasi-degenerate right-handed neutrinos. Successful leptogenesis implies the
usual lower bound on right-handed neutrino masses, and an upper bound on
left-handed neutrino masses (which we obtain to be 0.15eV at 3sigma) only if
right-handed neutrinos are assumed to be much more hierarchical than
left-handed neutrinos. Otherwise both bounds can be considerably relaxed. The
constraint on light neutrino masses varies assuming different interpretations
of why neutrinos should be quasi-degenerate. With conservative assumptions, we
find that a mild quasi-degeneracy allows neutrinos heavier than an eV
compatibly with leptogenesis.
We also extend computations of thermal leptogenesis to an alternative model
of neutrino mass mediated by fermion triplets which was never considered so far
for leptogenesis. Leptogenesis can be successful despite the effect of gauge
interactions, resulting in only slightly stronger constraints on neutrino
masses.
|
[
{
"created": "Tue, 16 Dec 2003 19:23:12 GMT",
"version": "v1"
},
{
"created": "Sat, 17 Apr 2004 17:00:14 GMT",
"version": "v2"
}
] |
2009-10-09
|
[
[
"Hambye",
"Thomas",
""
],
[
"Lin",
"Yin",
""
],
[
"Notari",
"Alessio",
""
],
[
"Papucci",
"Michele",
""
],
[
"Strumia",
"Alessandro",
""
]
] |
Upper bounds on the CP asymmetry relevant for leptogenesis are reexamined and found weaker than in previous literature, both for hierarchical and for quasi-degenerate right-handed neutrinos. Successful leptogenesis implies the usual lower bound on right-handed neutrino masses, and an upper bound on left-handed neutrino masses (which we obtain to be 0.15eV at 3sigma) only if right-handed neutrinos are assumed to be much more hierarchical than left-handed neutrinos. Otherwise both bounds can be considerably relaxed. The constraint on light neutrino masses varies assuming different interpretations of why neutrinos should be quasi-degenerate. With conservative assumptions, we find that a mild quasi-degeneracy allows neutrinos heavier than an eV compatibly with leptogenesis. We also extend computations of thermal leptogenesis to an alternative model of neutrino mass mediated by fermion triplets which was never considered so far for leptogenesis. Leptogenesis can be successful despite the effect of gauge interactions, resulting in only slightly stronger constraints on neutrino masses.
|
hep-ph/0006092
|
D. V. Ahluwalia
|
D. V. Ahluwalia, C. A. Ortiz, G. Z. Adunas
|
Robust flavor equalization of cosmic neutrino flux by quasi bi-maximal
mixing
|
8 pages [This preprint is no longer being pursued for publication.
Its essential contents are now published as part of D. V. Ahluwalia,
Ambiguity in source flux of cosmic/astrophysical neutrinos: Effects of
bi-maximal mixing and quantum-gravity induced decoherence, Mod. Phys. Lett. A
16 (2001) 917-926]
| null | null |
EdeFUAZ/ISGBG-07
|
hep-ph astro-ph hep-ex
| null |
For high energy cosmic neutrinos Athar, Jezabek, and Yasuda (AJY) have
recently shown that the existing data on neutrino oscillations suggests that
cosmic neutrino flux at the AGN/GRB source, F(nu_e):F(nu_mu):F(nu_tau) approx
1:2:0, oscillates to F(nu_e):F(nu_mu):F(nu_tau) approx 1:1:1. These results can
be confirmed at AMANDA, Baikal, ANTARES and NESTOR, and other neutrino
detectors with a good flavor resolution. Here, we re-derive the AJY result from
quasi bi-maximal mixing, and show that observation of
F(nu_e):F(nu_\mu):F(nu_tau) approx 1:1:1 does not necessarily establish cosmic
neutrino flux at the AGN/GRB source to be F(nu_e):F(nu_mu):F(nu_tau) approx
1:2:0.
|
[
{
"created": "Fri, 9 Jun 2000 21:37:28 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Jun 2000 20:54:07 GMT",
"version": "v2"
},
{
"created": "Thu, 11 Aug 2005 01:39:37 GMT",
"version": "v3"
}
] |
2007-05-23
|
[
[
"Ahluwalia",
"D. V.",
""
],
[
"Ortiz",
"C. A.",
""
],
[
"Adunas",
"G. Z.",
""
]
] |
For high energy cosmic neutrinos Athar, Jezabek, and Yasuda (AJY) have recently shown that the existing data on neutrino oscillations suggests that cosmic neutrino flux at the AGN/GRB source, F(nu_e):F(nu_mu):F(nu_tau) approx 1:2:0, oscillates to F(nu_e):F(nu_mu):F(nu_tau) approx 1:1:1. These results can be confirmed at AMANDA, Baikal, ANTARES and NESTOR, and other neutrino detectors with a good flavor resolution. Here, we re-derive the AJY result from quasi bi-maximal mixing, and show that observation of F(nu_e):F(nu_\mu):F(nu_tau) approx 1:1:1 does not necessarily establish cosmic neutrino flux at the AGN/GRB source to be F(nu_e):F(nu_mu):F(nu_tau) approx 1:2:0.
|
hep-ph/9702373
|
Arthur Hebecker
|
A. Hebecker
|
Diffractive Parton Distributions in the Semiclassical Approach
|
19 pages LaTeX, 2 figures included, uses psfig
|
Nucl.Phys.B505:349-365,1997
|
10.1016/S0550-3213(97)00512-9
|
DAMTP-97-10
|
hep-ph
| null |
Recently, a semiclassical approach to diffraction has been proposed, which
treats the proton as a classical colour field. The present paper demonstrates
that this approach is consistent with the concept of diffractive parton
distributions. The diffractive quark and gluon distributions are expressed
through integrals of non-Abelian eikonal factors in the fundamental and adjoint
representation respectively. As a by-product, previously calculated diffractive
cross sections for processes with a final state gluon are rederived in a
simpler way.
|
[
{
"created": "Thu, 20 Feb 1997 10:24:12 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Hebecker",
"A.",
""
]
] |
Recently, a semiclassical approach to diffraction has been proposed, which treats the proton as a classical colour field. The present paper demonstrates that this approach is consistent with the concept of diffractive parton distributions. The diffractive quark and gluon distributions are expressed through integrals of non-Abelian eikonal factors in the fundamental and adjoint representation respectively. As a by-product, previously calculated diffractive cross sections for processes with a final state gluon are rederived in a simpler way.
|
2012.08595
|
Camilo Garcia-Cely
|
Michael Duerr, Torben Ferber, Camilo Garcia-Cely, Christopher Hearty
and Kai Schmidt-Hoberg
|
Long-lived Dark Higgs and Inelastic Dark Matter at Belle II
|
Minor correction to Fig. 7
| null |
10.1007/JHEP04(2021)146
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Inelastic dark matter is an interesting scenario for light thermal dark
matter which is fully consistent with all cosmological probes as well as direct
and indirect dark matter detection. The required mass splitting between dark
matter $\chi_1$ and its heavier twin $\chi_2$ is naturally induced by a dark
Higgs field which also provides a simple mechanism to give mass to the dark
photon $A'$ present in the setup. The corresponding dark Higgs boson $h'$ is
naturally the lightest dark sector state and therefore decays into Standard
Model particles via Higgs mixing. In this work we study signatures with
displaced vertices and missing momentum at Belle II, arising from dark Higgs
particles produced in association with dark matter. We find that Belle II can
be very sensitive to this scenario, in particular if a displaced vertex trigger
is available in the near future.
|
[
{
"created": "Tue, 15 Dec 2020 20:12:28 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Apr 2021 10:22:45 GMT",
"version": "v2"
},
{
"created": "Thu, 16 Sep 2021 11:32:29 GMT",
"version": "v3"
}
] |
2021-09-17
|
[
[
"Duerr",
"Michael",
""
],
[
"Ferber",
"Torben",
""
],
[
"Garcia-Cely",
"Camilo",
""
],
[
"Hearty",
"Christopher",
""
],
[
"Schmidt-Hoberg",
"Kai",
""
]
] |
Inelastic dark matter is an interesting scenario for light thermal dark matter which is fully consistent with all cosmological probes as well as direct and indirect dark matter detection. The required mass splitting between dark matter $\chi_1$ and its heavier twin $\chi_2$ is naturally induced by a dark Higgs field which also provides a simple mechanism to give mass to the dark photon $A'$ present in the setup. The corresponding dark Higgs boson $h'$ is naturally the lightest dark sector state and therefore decays into Standard Model particles via Higgs mixing. In this work we study signatures with displaced vertices and missing momentum at Belle II, arising from dark Higgs particles produced in association with dark matter. We find that Belle II can be very sensitive to this scenario, in particular if a displaced vertex trigger is available in the near future.
|
1602.01377
|
James Maxin
|
Tianjun Li, James A. Maxin, Van E. Mayes, and Dimitri V. Nanopoulos
|
A Flippon Related Singlet at the LHC II
|
16 Pages, 3 Tables; JHEP Version
|
Journal of High Energy Physics, 2016(6), 1-20
|
10.1007/JHEP06(2016)167
|
ACT-01-16
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider the 750 GeV diphoton resonance at the 13 TeV LHC in the ${\cal
F}$-$SU(5)$ model with a Standard Model (SM) singlet field which couples to
TeV-scale vector-like particles, dubbed $flippons$. This singlet field assumes
the role of the 750 GeV resonance, with production via gluon fusion and
subsequent decay to a diphoton via the vector-like particle loops. We present a
numerical analysis showing that the observed 8 TeV and 13 TeV diphoton
production cross-sections can be generated in the model space with realistic
electric charges and Yukawa couplings for light vector-like masses. We further
discuss the experimental viability of light vector-like masses in a General
No-Scale ${\cal F}$-$SU(5)$ model, offering a few benchmark scenarios in this
consistent GUT that can satisfy all experimental constraints imposed by the LHC
and other essential experiments.
|
[
{
"created": "Wed, 3 Feb 2016 17:23:43 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Feb 2016 14:19:09 GMT",
"version": "v2"
},
{
"created": "Tue, 5 Jul 2016 14:35:10 GMT",
"version": "v3"
}
] |
2016-07-06
|
[
[
"Li",
"Tianjun",
""
],
[
"Maxin",
"James A.",
""
],
[
"Mayes",
"Van E.",
""
],
[
"Nanopoulos",
"Dimitri V.",
""
]
] |
We consider the 750 GeV diphoton resonance at the 13 TeV LHC in the ${\cal F}$-$SU(5)$ model with a Standard Model (SM) singlet field which couples to TeV-scale vector-like particles, dubbed $flippons$. This singlet field assumes the role of the 750 GeV resonance, with production via gluon fusion and subsequent decay to a diphoton via the vector-like particle loops. We present a numerical analysis showing that the observed 8 TeV and 13 TeV diphoton production cross-sections can be generated in the model space with realistic electric charges and Yukawa couplings for light vector-like masses. We further discuss the experimental viability of light vector-like masses in a General No-Scale ${\cal F}$-$SU(5)$ model, offering a few benchmark scenarios in this consistent GUT that can satisfy all experimental constraints imposed by the LHC and other essential experiments.
|
1902.06513
|
Nora Weickgenannt
|
Nora Weickgenannt, Xin-li Sheng, Enrico Speranza, Qun Wang, Dirk H.
Rischke
|
Kinetic theory for massive spin-1/2 particles from the Wigner-function
formalism
|
16 pages, no figure
|
Phys. Rev. D 100, 056018 (2019)
|
10.1103/PhysRevD.100.056018
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We calculate the Wigner function for massive spin-1/2 particles in an
inhomogeneous electromagnetic field to leading order in the Planck constant
$\hbar$. Going beyond leading order in $\hbar$ we then derive a generalized
Boltzmann equation in which the force exerted by an inhomogeneous
electromagnetic field on the particle dipole moment arises naturally. Carefully
taking the massless limit we find agreement with previous results. The case of
global equilibrium with rotation is also studied. Finally, we outline the
derivation of fluid-dynamical equations from the components of the Wigner
function. The conservation of total angular momentum is promoted as an
additional fluid-dynamical equation of motion. Our framework can be used to
study polarization effects induced by vorticity and magnetic field in
relativistic heavy-ion collisions.
|
[
{
"created": "Mon, 18 Feb 2019 11:08:23 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Aug 2019 09:27:46 GMT",
"version": "v2"
}
] |
2019-10-02
|
[
[
"Weickgenannt",
"Nora",
""
],
[
"Sheng",
"Xin-li",
""
],
[
"Speranza",
"Enrico",
""
],
[
"Wang",
"Qun",
""
],
[
"Rischke",
"Dirk H.",
""
]
] |
We calculate the Wigner function for massive spin-1/2 particles in an inhomogeneous electromagnetic field to leading order in the Planck constant $\hbar$. Going beyond leading order in $\hbar$ we then derive a generalized Boltzmann equation in which the force exerted by an inhomogeneous electromagnetic field on the particle dipole moment arises naturally. Carefully taking the massless limit we find agreement with previous results. The case of global equilibrium with rotation is also studied. Finally, we outline the derivation of fluid-dynamical equations from the components of the Wigner function. The conservation of total angular momentum is promoted as an additional fluid-dynamical equation of motion. Our framework can be used to study polarization effects induced by vorticity and magnetic field in relativistic heavy-ion collisions.
|
hep-ph/9909491
|
Thomas Hadig
|
Thomas Hadig and Gavin McCance
|
A common scheme for running NLO ep event generators
|
19 pages, Proceedings of Workshop on Monte Carlo Generators for HERA
Physics 1998/99
| null | null | null |
hep-ph
| null |
In this article we present a generic interface to several next-to-leading
order cross-section programs. This enables the user to implement his/her code
once and make cross-checks with different programs.
|
[
{
"created": "Thu, 23 Sep 1999 16:35:02 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Hadig",
"Thomas",
""
],
[
"McCance",
"Gavin",
""
]
] |
In this article we present a generic interface to several next-to-leading order cross-section programs. This enables the user to implement his/her code once and make cross-checks with different programs.
|
0909.2257
|
Sanjib Kumar Agarwalla
|
Sanjib Kumar Agarwalla and Patrick Huber
|
Exploring neutrino parameters with a beta-beam experiment from FNAL to
DUSEL
|
17 pages, 9 eps figures, updated background estimates for detectors
and reduced size of LArTPC to 50kt. Added discussion of 730km baseline.
Conclusion slightly modified.
|
Phys.Lett.B693:114-121,2010
|
10.1016/j.physletb.2010.08.009
|
VPI-IPNAS-09-11
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss in detail the physics reach of an experimental set-up where
electron neutrinos (anti-neutrinos) produced in a beta-beam facility at Fermi
National Accelerator Laboratory (FNAL) are sent, over a distance of L~1300km,
to the Deep Underground Science and Engineering Laboratory (DUSEL). A 300kt
Water Cherenkov (WC) detector and a 50kt Liquid Argon Time Projection Chamber
(LArTPC) are considered as possible detector choices. We propose to use 18Ne
and 6He as source ions for electron neutrino and electron anti-neutrino beams,
respectively. The maximum Lorentz boost factor, gamma, available for these ions
using the Tevatron are gamma_Ne=585 and gamma_He=350. This particular set-up
provides the opportunity to probe the first oscillation maximum using the
neutrino beam and the second oscillation maximum using the anti-neutrino beam
which helps to evade some parameter degeneracies. The resulting physics
sensitivities for theta_13, CP violation and the mass hierarchy are compared to
those of a conventional superbeam from FNAL to DUSEL.
|
[
{
"created": "Fri, 11 Sep 2009 20:03:40 GMT",
"version": "v1"
},
{
"created": "Fri, 30 Apr 2010 13:32:22 GMT",
"version": "v2"
},
{
"created": "Mon, 3 May 2010 16:31:15 GMT",
"version": "v3"
}
] |
2015-03-13
|
[
[
"Agarwalla",
"Sanjib Kumar",
""
],
[
"Huber",
"Patrick",
""
]
] |
We discuss in detail the physics reach of an experimental set-up where electron neutrinos (anti-neutrinos) produced in a beta-beam facility at Fermi National Accelerator Laboratory (FNAL) are sent, over a distance of L~1300km, to the Deep Underground Science and Engineering Laboratory (DUSEL). A 300kt Water Cherenkov (WC) detector and a 50kt Liquid Argon Time Projection Chamber (LArTPC) are considered as possible detector choices. We propose to use 18Ne and 6He as source ions for electron neutrino and electron anti-neutrino beams, respectively. The maximum Lorentz boost factor, gamma, available for these ions using the Tevatron are gamma_Ne=585 and gamma_He=350. This particular set-up provides the opportunity to probe the first oscillation maximum using the neutrino beam and the second oscillation maximum using the anti-neutrino beam which helps to evade some parameter degeneracies. The resulting physics sensitivities for theta_13, CP violation and the mass hierarchy are compared to those of a conventional superbeam from FNAL to DUSEL.
|
1307.2448
|
George Wei-Shu Hou
|
George W.S. Hou
|
Enhanced Bd --> mu+ mu- Decay: What if?
|
4 pages, 5 figures, talk presented at LHCP2013, Barcelona, May 2013
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
If the very rare $B_d^0 \to \mu^+\mu^-$ decay is enhanced to (3--4) $\times
10^{-10}$ level or higher, it can be discovered with existing 2011-2012 LHC
data. It might then cast some doubt on the Higgs boson nature of the 126 GeV
boson, since the likely explanation would be due to the fourth generation
$t^\prime$ quark. There is a mild motivation from the known tension in
$\sin2\beta/\phi_1$. If discovery is made before the 13 TeV run, then the $b
\to d$ quadrangle (modulo $m_{t'}$) would suddenly fall into our lap. Continued
pursuit in future runs can probe below $3 \times 10^{-10}$.
|
[
{
"created": "Tue, 9 Jul 2013 13:31:34 GMT",
"version": "v1"
}
] |
2013-07-10
|
[
[
"Hou",
"George W. S.",
""
]
] |
If the very rare $B_d^0 \to \mu^+\mu^-$ decay is enhanced to (3--4) $\times 10^{-10}$ level or higher, it can be discovered with existing 2011-2012 LHC data. It might then cast some doubt on the Higgs boson nature of the 126 GeV boson, since the likely explanation would be due to the fourth generation $t^\prime$ quark. There is a mild motivation from the known tension in $\sin2\beta/\phi_1$. If discovery is made before the 13 TeV run, then the $b \to d$ quadrangle (modulo $m_{t'}$) would suddenly fall into our lap. Continued pursuit in future runs can probe below $3 \times 10^{-10}$.
|
1109.1401
|
Boglione Mariaelena
|
M. Boglione
|
Transverse Momentum Dependent Partonic Distribution and Fragmentation
Functions
|
5 pages, two figures. To appear in the Proceedings of the 19th
Particles & Nuclei International Conference (PANIC 2011), July 24th--29th,
2011, Massachusetts Institute of Technology, Cambridge, MA, USA
| null |
10.1063/1.3700517
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Our knowledge on the three-dimensional momentum structure of hadrons is
encoded in the Transverse Momentum Dependent partonic distribution and
fragmentation functions (TMDs). A brief and updated review of the TMDs and of
the processes in which they might play a role is presented.
|
[
{
"created": "Wed, 7 Sep 2011 09:46:03 GMT",
"version": "v1"
}
] |
2015-05-30
|
[
[
"Boglione",
"M.",
""
]
] |
Our knowledge on the three-dimensional momentum structure of hadrons is encoded in the Transverse Momentum Dependent partonic distribution and fragmentation functions (TMDs). A brief and updated review of the TMDs and of the processes in which they might play a role is presented.
|
1610.03372
|
Peng-fei Yin
|
Qian-Fei Xiang, Xiao-Jun Bi, Qi-Shu Yan, Peng-Fei Yin, and Zhao-Huan
Yu
|
Measuring Masses in Semi-Invisible Final States at Electron-Positron
Colliders
|
23 pages, 15 figures, 2 tables. V2, method improved, figures and
discussions added
|
Phys. Rev. D 95, 075037 (2017)
|
10.1103/PhysRevD.95.075037
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Mass measurement of a particle whose decay products including invisible
particles is a challenging task at colliders. For a new physics model involving
a dark matter candidate $N$ and a $Z_2$ symmetry that stabilizes it, a typical
new process at $e^+e^-$ colliders is the pair production $e^+e^- \to Y\bar{Y}$
followed by decay processes $Y\to aN$ and $\bar{Y}\to b\bar{N}$, where $a$ and
$b$ are visible but $N$ is invisible. In this work, we propose a new method to
measure the physical masses in this topology by making use of the kinematic
equations given by momentum-energy conservation and on-shell conditions. For
each event, the solvability of these equations determines a limited region on
the trial $m_Y$-$m_N$ plane. The edge of this region can be used to define two
variables, $m_Y^\mathrm{edge}$ and $m_N^\mathrm{edge}$, whose distributions are
utilized to derive the measurement values of $m_Y$ and $m_N$. The measurement
deviations and uncertainties are also estimated after including detector
effects and background contamination.
|
[
{
"created": "Tue, 11 Oct 2016 14:44:48 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Jun 2017 15:18:02 GMT",
"version": "v2"
}
] |
2017-06-13
|
[
[
"Xiang",
"Qian-Fei",
""
],
[
"Bi",
"Xiao-Jun",
""
],
[
"Yan",
"Qi-Shu",
""
],
[
"Yin",
"Peng-Fei",
""
],
[
"Yu",
"Zhao-Huan",
""
]
] |
Mass measurement of a particle whose decay products including invisible particles is a challenging task at colliders. For a new physics model involving a dark matter candidate $N$ and a $Z_2$ symmetry that stabilizes it, a typical new process at $e^+e^-$ colliders is the pair production $e^+e^- \to Y\bar{Y}$ followed by decay processes $Y\to aN$ and $\bar{Y}\to b\bar{N}$, where $a$ and $b$ are visible but $N$ is invisible. In this work, we propose a new method to measure the physical masses in this topology by making use of the kinematic equations given by momentum-energy conservation and on-shell conditions. For each event, the solvability of these equations determines a limited region on the trial $m_Y$-$m_N$ plane. The edge of this region can be used to define two variables, $m_Y^\mathrm{edge}$ and $m_N^\mathrm{edge}$, whose distributions are utilized to derive the measurement values of $m_Y$ and $m_N$. The measurement deviations and uncertainties are also estimated after including detector effects and background contamination.
|
hep-ph/0012303
|
Kaladi Babu
|
K.S. Babu (Oklahoma State University), S.M. Barr (Bartol Research
Institute), and Ilja Dorsner (Bartol Research Institute)
|
The scaling of lepton dipole moments with lepton mass
|
19 pages with 5 figures
|
Phys.Rev.D64:053009,2001
|
10.1103/PhysRevD.64.053009
|
OSU-HEP-00-07, BA-00-66
|
hep-ph
| null |
The dipole moments of the leptons and quarks are matrices in flavor space,
which can potentially reveal as much about the flavor structure of the theory
as do the mass matrices. The off-diagonal elements of the dipole matrices lead
to flavor-changing decays such as \mu -> e \gamma, while the imaginary parts of
the diagonal elements give rise to electric dipole moments. We analyze the
scaling of the leptonic dipole moments with the lepton masses in theories
beyond the standard model. While in many models the dipole moments scale
roughly as lepton mass, it is shown that simple models exist in which the
dipoles scale as the cube of the mass or in other ways. An explicit example
with cubic scaling is presented, which is motivated on independent grounds from
large angle neutrino oscillation data. Our results have great significance for
the observability of the electric dipole moments of e, \mu and \tau, and the
rare decays \mu -> e \gamma, and \tau -> \mu \gamma and will be tested in
several forthcoming experiments.
|
[
{
"created": "Fri, 22 Dec 2000 00:40:14 GMT",
"version": "v1"
}
] |
2014-11-17
|
[
[
"Babu",
"K. S.",
"",
"Oklahoma State University"
],
[
"Barr",
"S. M.",
"",
"Bartol Research\n Institute"
],
[
"Dorsner",
"Ilja",
"",
"Bartol Research Institute"
]
] |
The dipole moments of the leptons and quarks are matrices in flavor space, which can potentially reveal as much about the flavor structure of the theory as do the mass matrices. The off-diagonal elements of the dipole matrices lead to flavor-changing decays such as \mu -> e \gamma, while the imaginary parts of the diagonal elements give rise to electric dipole moments. We analyze the scaling of the leptonic dipole moments with the lepton masses in theories beyond the standard model. While in many models the dipole moments scale roughly as lepton mass, it is shown that simple models exist in which the dipoles scale as the cube of the mass or in other ways. An explicit example with cubic scaling is presented, which is motivated on independent grounds from large angle neutrino oscillation data. Our results have great significance for the observability of the electric dipole moments of e, \mu and \tau, and the rare decays \mu -> e \gamma, and \tau -> \mu \gamma and will be tested in several forthcoming experiments.
|
hep-ph/0006205
|
Robert D. Pisarski
|
Robert D. Pisarski
|
Quark-Gluon Plasma as a Condensate of Z(3) Wilson Lines
|
5 pages, LaTeX
|
Phys.Rev.D62:111501,2000
|
10.1103/PhysRevD.62.111501
| null |
hep-ph
| null |
Effective theories for the thermal Wilson line are constructed in an SU(N)
gauge theory at nonzero temperature. I propose that the order of the
deconfining phase transition for Z(N) Wilson lines is governed by the behavior
of SU(N) Wilson lines. In a mean field theory, the free energy in the
deconfined phase is controlled by the condensate for Z(N) Wilson lines.
Numerical simulations on the lattice, and the mean field theory for Z(3) Wilson
lines, suggest that about any finite temperature transition in QCD, the
dominant correlation length increases by a large, uniform factor, of order
five.
|
[
{
"created": "Sat, 17 Jun 2000 14:22:53 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Oct 2000 21:59:27 GMT",
"version": "v2"
}
] |
2009-12-30
|
[
[
"Pisarski",
"Robert D.",
""
]
] |
Effective theories for the thermal Wilson line are constructed in an SU(N) gauge theory at nonzero temperature. I propose that the order of the deconfining phase transition for Z(N) Wilson lines is governed by the behavior of SU(N) Wilson lines. In a mean field theory, the free energy in the deconfined phase is controlled by the condensate for Z(N) Wilson lines. Numerical simulations on the lattice, and the mean field theory for Z(3) Wilson lines, suggest that about any finite temperature transition in QCD, the dominant correlation length increases by a large, uniform factor, of order five.
|
2012.10979
|
Phung Van Dong
|
Duong Van Loi, Cao H. Nam, Phung Van Dong
|
Dark matter in the fully flipped 3-3-1-1 model
|
34 pages, 9 figures, 12 tables; substantially improved, published in
EPJC
|
Eur. Phys. J. C 81, 591 (2021)
|
10.1140/epjc/s10052-021-09374-4
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present the features of the fully flipped 3-3-1-1 model and show that this
model leads to dark matter candidates naturally. We study two dark matter
scenarios corresponding to the triplet fermion and singlet scalar candidates,
and we determine the viable parameter regimes constrained from the observed
relic density and direct detection experiments.
|
[
{
"created": "Sun, 20 Dec 2020 17:24:19 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Jul 2021 11:39:37 GMT",
"version": "v2"
}
] |
2021-07-20
|
[
[
"Van Loi",
"Duong",
""
],
[
"Nam",
"Cao H.",
""
],
[
"Van Dong",
"Phung",
""
]
] |
We present the features of the fully flipped 3-3-1-1 model and show that this model leads to dark matter candidates naturally. We study two dark matter scenarios corresponding to the triplet fermion and singlet scalar candidates, and we determine the viable parameter regimes constrained from the observed relic density and direct detection experiments.
|
hep-ph/0305309
|
Walter Grimus
|
W. Grimus, L. Lavoura
|
A non-standard CP transformation leading to maximal atmospheric neutrino
mixing
|
13 pages, plain LaTeX, no figures; minor modifications, final version
for Phys. Lett. B
|
Phys.Lett. B579 (2004) 113-122
|
10.1016/j.physletb.2003.10.075
|
UWThPh-2003-9
|
hep-ph
| null |
We discuss a neutrino mass matrix $\mathcal{M}_\nu$ originally found by Babu,
Ma, and Valle (BMV) and show that this mass matrix can be characterized by a
simple algebraic relation. From this relation it follows that atmospheric
neutrino mixing is exactly maximal while at the same time an arbitrary mixing
angle $\theta_{13}$ of the lepton mixing matrix $U$ is allowed and--in the
usual phase convention--CP violation in mixing is maximal; moreover, neither
the neutrino mass spectrum nor the solar mixing angle are restricted. We put
forward a simple seesaw extension of the Standard Model where the family lepton
numbers are softly broken by the Majorana mass terms of the right-handed
neutrino singlets and the BMV mass matrix results from a non-standard $CP$
symmetry.
|
[
{
"created": "Wed, 28 May 2003 13:52:09 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Sep 2003 10:12:25 GMT",
"version": "v2"
},
{
"created": "Fri, 24 Oct 2003 14:08:24 GMT",
"version": "v3"
}
] |
2015-06-25
|
[
[
"Grimus",
"W.",
""
],
[
"Lavoura",
"L.",
""
]
] |
We discuss a neutrino mass matrix $\mathcal{M}_\nu$ originally found by Babu, Ma, and Valle (BMV) and show that this mass matrix can be characterized by a simple algebraic relation. From this relation it follows that atmospheric neutrino mixing is exactly maximal while at the same time an arbitrary mixing angle $\theta_{13}$ of the lepton mixing matrix $U$ is allowed and--in the usual phase convention--CP violation in mixing is maximal; moreover, neither the neutrino mass spectrum nor the solar mixing angle are restricted. We put forward a simple seesaw extension of the Standard Model where the family lepton numbers are softly broken by the Majorana mass terms of the right-handed neutrino singlets and the BMV mass matrix results from a non-standard $CP$ symmetry.
|
hep-ph/0004188
|
Juan Garcia-Bellido
|
Juan Garcia-Bellido
|
Astrophysics and Cosmology
|
Invited Lectures at 1999 European School of High Energy Physics,
Casta-Papiernicka, Slovak Republic, 22 August - 4 September 1999 78 pages, 42
figures, uses cernrep.cls
| null | null | null |
hep-ph
| null |
These notes are intended as an introductory course for experimental particle
physicists interested in the recent developments in astrophysics and cosmology.
I will describe the standard Big Bang theory of the evolution of the universe,
with its successes and shortcomings, which will lead to inflationary cosmology
as the paradigm for the origin of the global structure of the universe as well
as the origin of the spectrum of density perturbations responsible for
structure in our local patch. I will present a review of the very rich
phenomenology that we have in cosmology today, as well as evidence for the
observational revolution that this field is going through, which will provide
us, in the next few years, with an accurate determination of the parameters of
our standard cosmological model.
|
[
{
"created": "Wed, 19 Apr 2000 17:09:53 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Garcia-Bellido",
"Juan",
""
]
] |
These notes are intended as an introductory course for experimental particle physicists interested in the recent developments in astrophysics and cosmology. I will describe the standard Big Bang theory of the evolution of the universe, with its successes and shortcomings, which will lead to inflationary cosmology as the paradigm for the origin of the global structure of the universe as well as the origin of the spectrum of density perturbations responsible for structure in our local patch. I will present a review of the very rich phenomenology that we have in cosmology today, as well as evidence for the observational revolution that this field is going through, which will provide us, in the next few years, with an accurate determination of the parameters of our standard cosmological model.
|
hep-ph/9409267
|
Sang Jin Sin
|
S.U. Ji and S.J. Sin (Hanyang University)
|
Late-time Phase transition and the Galactic halo as a Bose Liquid: (II)
the Effect of Visible Matter
|
10 pages, 10 figures included, to appear in Phys. Rev. D50,p3655
|
Phys.Rev.D50:3655-3659,1994
|
10.1103/PhysRevD.50.3655
| null |
hep-ph
| null |
In the previous work, we investigated the rotation curves of galaxies
assuming that the dark matter consists of ultra light boson appearing in
$'$late time phase transition' theory. Generalizing this work, we consider the
effect of visible matter and classify the types of rotation curves as we vary
the fraction of the mass and extention of visible matter. We show that visible
matter, in galaxies with flat rotation curves, has mass fraction $ 2\% \sim
10\% $ and it is confined within the distance fraction $ 10\% \sim 20\%$.
|
[
{
"created": "Sat, 10 Sep 1994 00:37:34 GMT",
"version": "v1"
}
] |
2010-11-30
|
[
[
"Ji",
"S. U.",
"",
"Hanyang University"
],
[
"Sin",
"S. J.",
"",
"Hanyang University"
]
] |
In the previous work, we investigated the rotation curves of galaxies assuming that the dark matter consists of ultra light boson appearing in $'$late time phase transition' theory. Generalizing this work, we consider the effect of visible matter and classify the types of rotation curves as we vary the fraction of the mass and extention of visible matter. We show that visible matter, in galaxies with flat rotation curves, has mass fraction $ 2\% \sim 10\% $ and it is confined within the distance fraction $ 10\% \sim 20\%$.
|
hep-ph/9601239
|
Reyes
|
R. D. Peccei (Department of Physics and Astronomy, UCLA)
|
Summary of the International Symposium on Heavy Flavor and Electroweak
Theory
|
14 pages, latex file
| null | null |
UCLA/95/TEP/30
|
hep-ph
| null |
This summary discusses some of the topics which were of overarching interest
at the Symposium. These included, corrections to perturbative QCD predictions;
heavy quark physics; electroweak symmetry breaking; and physics of the top
quark.
|
[
{
"created": "Thu, 11 Jan 1996 01:00:50 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Peccei",
"R. D.",
"",
"Department of Physics and Astronomy, UCLA"
]
] |
This summary discusses some of the topics which were of overarching interest at the Symposium. These included, corrections to perturbative QCD predictions; heavy quark physics; electroweak symmetry breaking; and physics of the top quark.
|
hep-ph/9609377
|
Pieter Rijken
|
P.J. Rijken, W.L. van Neerven
|
Higher order QCD corrections to the transverse and longitudinal
fragmentation functions in electron-positron annihilation
|
69 pages, latex2e, uses mcite, amsfonts. PostScript version available
at http://rulgm4.leidenuniv.nl/preprints/transfrag.ps
|
Nucl.Phys.B487:233-282,1997
|
10.1016/S0550-3213(96)00669-4
|
INLO-PUB-09/96
|
hep-ph
| null |
We present the calculation of the order $\alpha_s^2$ corrections to the
coefficient functions contributing to the longitudinal ($F_L(x,Q^2)$) and
transverse fragmentation functions ($F_T(x,Q^2)$) measured in electron-positron
annihilation. The effect of these higher order QCD corrections on the behaviour
of the fragmentation functions and the corresponding longitudinal
($d\sigma_L(x,Q^2)/dx$) and transverse cross sections ($d\sigma_T(x,Q^2)/dx$)
are studied. In particular we investigate the dependence of the above
quantities on the mass factorization scale ($M$) and the various
parameterizations chosen for the parton fragmentation densities $D_p^H(x,M^2)$
($p=q,g$; $H=\pi^\pm, K^\pm, P, \bar{P}$). Our analysis reveals that the order
\alpha_s^2 contributions to $F_L(x,Q^2)$ are large whereas these contributions
to $F_T(x,Q^2)$ are small. From the above fragmentation functions one can also
compute the integrated cross sections $\sigma_L$ and $\sigma_T$ in an
independent way. The sum $\sigma_{tot} = \sigma_L + \sigma_T$, corrected up to
order \alphastwo, agrees with the well known result in the literature providing
us with an independent check an our calculations.
|
[
{
"created": "Tue, 17 Sep 1996 15:44:23 GMT",
"version": "v1"
}
] |
2009-09-25
|
[
[
"Rijken",
"P. J.",
""
],
[
"van Neerven",
"W. L.",
""
]
] |
We present the calculation of the order $\alpha_s^2$ corrections to the coefficient functions contributing to the longitudinal ($F_L(x,Q^2)$) and transverse fragmentation functions ($F_T(x,Q^2)$) measured in electron-positron annihilation. The effect of these higher order QCD corrections on the behaviour of the fragmentation functions and the corresponding longitudinal ($d\sigma_L(x,Q^2)/dx$) and transverse cross sections ($d\sigma_T(x,Q^2)/dx$) are studied. In particular we investigate the dependence of the above quantities on the mass factorization scale ($M$) and the various parameterizations chosen for the parton fragmentation densities $D_p^H(x,M^2)$ ($p=q,g$; $H=\pi^\pm, K^\pm, P, \bar{P}$). Our analysis reveals that the order \alpha_s^2 contributions to $F_L(x,Q^2)$ are large whereas these contributions to $F_T(x,Q^2)$ are small. From the above fragmentation functions one can also compute the integrated cross sections $\sigma_L$ and $\sigma_T$ in an independent way. The sum $\sigma_{tot} = \sigma_L + \sigma_T$, corrected up to order \alphastwo, agrees with the well known result in the literature providing us with an independent check an our calculations.
|
1904.08206
|
Xue Gong
|
Xue Gong, Chong-Xing Yue, Yu-Chen Guo
|
Search for vector-like bottom quark via $Zb$ production at the LHC
|
11 pages, 10 figures, references added, version accepted by PLB
| null |
10.1016/j.physletb.2019.04.051
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Vector-like quarks (VLQs) are predicted in many new physics scenarios beyond
the standard model (SM). We consider a search strategy for vector-like bottom
quark (VLQ-$B$) at the LHC in a model independent fashion. Our analysis is
based on single production of VLQ-$B$ with decaying to the $ Zb$ mode. The
production cross sections and the signal significance $SS$ are calculated, and
the observability of the VLQ-$B$ signal is investigated. Our numerical results
show that the possible signals of the VLQ-$B$ with electric charge of $Q_B=
-1/3$, which is the $SU(2)$ singlet, might be detected via the process $pp \to
B \to Z~(\to l^+ l^-) b$ at the upgraded LHC.
|
[
{
"created": "Wed, 17 Apr 2019 11:52:30 GMT",
"version": "v1"
},
{
"created": "Mon, 6 May 2019 12:47:57 GMT",
"version": "v2"
}
] |
2019-05-22
|
[
[
"Gong",
"Xue",
""
],
[
"Yue",
"Chong-Xing",
""
],
[
"Guo",
"Yu-Chen",
""
]
] |
Vector-like quarks (VLQs) are predicted in many new physics scenarios beyond the standard model (SM). We consider a search strategy for vector-like bottom quark (VLQ-$B$) at the LHC in a model independent fashion. Our analysis is based on single production of VLQ-$B$ with decaying to the $ Zb$ mode. The production cross sections and the signal significance $SS$ are calculated, and the observability of the VLQ-$B$ signal is investigated. Our numerical results show that the possible signals of the VLQ-$B$ with electric charge of $Q_B= -1/3$, which is the $SU(2)$ singlet, might be detected via the process $pp \to B \to Z~(\to l^+ l^-) b$ at the upgraded LHC.
|
1305.0248
|
Takeshi Araki
|
Takeshi Araki
|
Is \theta_{13}^{PMNS} correlated with \theta_{23}^{PMNS} or not?
|
v1: 22 pages, 14 figures; v2: references added, minor changes; v3:
compressed to be 17 pages, Sec. V-A modified, final version
| null |
10.1093/ptep/ptt082
|
MISC-2013-03
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
By postulating the relation \theta_{23} \simeq 45^\circ + \eta\theta_{13}, we
seek preferable correction terms to tri-bi-maximal mixing and discuss their
origins. Global analyses of the neutrino oscillation parameters favor \eta=\pm
1/\sqrt{2}; this corresponds to the relation found by Edy, Frampton, and
Matsuzaki some years ago in the context of a T^\prime flavor symmetry. In
contrast, the results of the \nu_\mu disappearance mode reported by the T2K and
Super-Kamiokande collaborations seem to prefer \eta=0, which gives an almost
maximal \theta_{23}. We derive a general condition for ensuring \theta_{23}
\simeq 45^\circ + \eta\theta_{13} and find that the condition is complicated by
the neutrino masses and CP violating phases. We investigate the condition under
simplified environments and arrive at several correction terms to the mass
matrices. It is found that the obtained correction terms can arise from flavor
symmetries or one-loop radiative corrections.
|
[
{
"created": "Wed, 1 May 2013 19:17:25 GMT",
"version": "v1"
},
{
"created": "Wed, 8 May 2013 08:18:25 GMT",
"version": "v2"
},
{
"created": "Wed, 11 Sep 2013 04:54:09 GMT",
"version": "v3"
}
] |
2014-05-07
|
[
[
"Araki",
"Takeshi",
""
]
] |
By postulating the relation \theta_{23} \simeq 45^\circ + \eta\theta_{13}, we seek preferable correction terms to tri-bi-maximal mixing and discuss their origins. Global analyses of the neutrino oscillation parameters favor \eta=\pm 1/\sqrt{2}; this corresponds to the relation found by Edy, Frampton, and Matsuzaki some years ago in the context of a T^\prime flavor symmetry. In contrast, the results of the \nu_\mu disappearance mode reported by the T2K and Super-Kamiokande collaborations seem to prefer \eta=0, which gives an almost maximal \theta_{23}. We derive a general condition for ensuring \theta_{23} \simeq 45^\circ + \eta\theta_{13} and find that the condition is complicated by the neutrino masses and CP violating phases. We investigate the condition under simplified environments and arrive at several correction terms to the mass matrices. It is found that the obtained correction terms can arise from flavor symmetries or one-loop radiative corrections.
|
hep-ph/0610100
|
Jonathan Rosner
|
Jonathan L. Rosner
|
Uncovering the Nature of the Weak Interaction
|
Invited talk presented at Jim Cronin's 75th birthday celebration,
Chicago, September 8-9, 2006. To be published in the Proceedings
| null | null |
EFI 06-21
|
hep-ph hep-ex
| null |
This brief review traces the development of our understanding of the weak
interactions, highlighting Jim Cronin's contributions through his studies of
strange particle decays and the developments to which they led.
|
[
{
"created": "Mon, 9 Oct 2006 15:07:28 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Rosner",
"Jonathan L.",
""
]
] |
This brief review traces the development of our understanding of the weak interactions, highlighting Jim Cronin's contributions through his studies of strange particle decays and the developments to which they led.
|
1804.01638
|
Volodymyr Takhistov
|
Graciela B. Gelmini, Volodymyr Takhistov, Samuel J. Witte
|
Casting a Wide Signal Net with Future Direct Dark Matter Detection
Experiments
|
65 pages, 16 figures, 16 tables; v3: added erratum, main results and
conclusions unchanged
|
JCAP (2018) no.07, 009; Erratum: JCAP (2019) no.02, E02
|
10.1088/1475-7516/2018/07/009 10.1088/1475-7516/2019/02/E02/meta
| null |
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
As dark matter (DM) direct detection experiments continue to improve their
sensitivity they will inevitably encounter an irreducible background arising
from coherent neutrino scattering. This so-called "neutrino floor" may
significantly reduce the sensitivity of an experiment to DM-nuclei
interactions, particularly if the recoil spectrum of the neutrino background is
approximately degenerate with the DM signal. This occurs for the conventionally
considered spin-independent (SI) or spin-dependent (SD) interactions. In such
case, an increase in the experiment's exposure by multiple orders of magnitude
may not yield any significant increase in sensitivity. The typically considered
SI and SD interactions, however, do not adequately reflect the whole landscape
of the well-motivated DM models, which includes other interactions. Since
particle DM has not been detected yet in laboratories, it is essential to
understand and maximize the detection capabilities for a broad variety of
possible models and signatures. In this work we explore the impact of the
background arising from various neutrino sources on the discovery potential of
a DM signal for a large class of viable DM-nucleus interactions and several
potential futuristic experimental settings, with different target elements. For
some momentum suppressed cross sections, large DM particle masses and heavier
targets, we find that there is no suppression of the discovery limits due to
neutrino backgrounds. Further, we explicitly demonstrate that inelastic
scattering, which could appear in models with multicomponent dark sectors,
would help to lift the signal degeneracy associated with the neutrino floor.
This study could assist with mapping out the optimal DM detection strategy for
the next generation of experiments.
|
[
{
"created": "Thu, 5 Apr 2018 00:56:40 GMT",
"version": "v1"
},
{
"created": "Sat, 30 Jun 2018 20:20:53 GMT",
"version": "v2"
},
{
"created": "Wed, 27 Feb 2019 21:29:12 GMT",
"version": "v3"
}
] |
2019-03-01
|
[
[
"Gelmini",
"Graciela B.",
""
],
[
"Takhistov",
"Volodymyr",
""
],
[
"Witte",
"Samuel J.",
""
]
] |
As dark matter (DM) direct detection experiments continue to improve their sensitivity they will inevitably encounter an irreducible background arising from coherent neutrino scattering. This so-called "neutrino floor" may significantly reduce the sensitivity of an experiment to DM-nuclei interactions, particularly if the recoil spectrum of the neutrino background is approximately degenerate with the DM signal. This occurs for the conventionally considered spin-independent (SI) or spin-dependent (SD) interactions. In such case, an increase in the experiment's exposure by multiple orders of magnitude may not yield any significant increase in sensitivity. The typically considered SI and SD interactions, however, do not adequately reflect the whole landscape of the well-motivated DM models, which includes other interactions. Since particle DM has not been detected yet in laboratories, it is essential to understand and maximize the detection capabilities for a broad variety of possible models and signatures. In this work we explore the impact of the background arising from various neutrino sources on the discovery potential of a DM signal for a large class of viable DM-nucleus interactions and several potential futuristic experimental settings, with different target elements. For some momentum suppressed cross sections, large DM particle masses and heavier targets, we find that there is no suppression of the discovery limits due to neutrino backgrounds. Further, we explicitly demonstrate that inelastic scattering, which could appear in models with multicomponent dark sectors, would help to lift the signal degeneracy associated with the neutrino floor. This study could assist with mapping out the optimal DM detection strategy for the next generation of experiments.
|
0804.3714
|
Yury Bystritskiy
|
Yu.M. Bystritskiy, E.A. Kuraev, M. Se\v{c}ansk\'y, M.K. Volkov
|
Radiative decays of pseudoscalar (P) and vector (V) mesons and the
process e^+e^- \to \eta' \rho
|
7 pages, 4 figures, 1 table
|
Nucl.Phys.Proc.Suppl.181-182:210-214,2008
|
10.1016/j.nuclphysbps.2008.09.038
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Radiative decays of pseudoscalar and vector mesons are calculated in the
framework of the chiral Nambu-Jona-Lasinio (NJL) model. We use the amplitude
for triangle quark loops of anomalous type. In evaluating these loop integrals
we use two methods. In the first one, we neglect the dependence of external
momenta by reproducing the Wess-Zumino-Witten terms of effective chiral meson
Lagrangian. In the second method, we take into account the momentum dependence
of loop integrals omitting their imaginary part. This makes it possible to
allow for quark confinement. As applied both the methods is in qualitative
agreement with each other and with experimental data. The second method allows
us to describe the electron-positron annihilation with production of $\eta'$
and $\rho$ mesons in the center of mass energy range from 1.6 to 3.5$\GeV$. The
comparison with the recent experimental data is presented.
|
[
{
"created": "Wed, 23 Apr 2008 13:33:35 GMT",
"version": "v1"
},
{
"created": "Sat, 3 May 2008 11:57:48 GMT",
"version": "v2"
},
{
"created": "Tue, 27 May 2008 13:31:08 GMT",
"version": "v3"
},
{
"created": "Tue, 23 Sep 2008 10:22:31 GMT",
"version": "v4"
}
] |
2008-11-07
|
[
[
"Bystritskiy",
"Yu. M.",
""
],
[
"Kuraev",
"E. A.",
""
],
[
"Sečanský",
"M.",
""
],
[
"Volkov",
"M. K.",
""
]
] |
Radiative decays of pseudoscalar and vector mesons are calculated in the framework of the chiral Nambu-Jona-Lasinio (NJL) model. We use the amplitude for triangle quark loops of anomalous type. In evaluating these loop integrals we use two methods. In the first one, we neglect the dependence of external momenta by reproducing the Wess-Zumino-Witten terms of effective chiral meson Lagrangian. In the second method, we take into account the momentum dependence of loop integrals omitting their imaginary part. This makes it possible to allow for quark confinement. As applied both the methods is in qualitative agreement with each other and with experimental data. The second method allows us to describe the electron-positron annihilation with production of $\eta'$ and $\rho$ mesons in the center of mass energy range from 1.6 to 3.5$\GeV$. The comparison with the recent experimental data is presented.
|
2306.07767
|
Hyun Min Lee
|
Simon Cl\'ery, Hyun Min Lee, Adriana G. Menkara
|
Higgs Inflation at the Pole
|
25 pages, 3 figures, version to be published in JHEP
| null | null | null |
hep-ph astro-ph.CO hep-th
|
http://creativecommons.org/licenses/by-nc-sa/4.0/
|
We propose a novel possibility for Higgs inflation where the perturbative
unitarity below the Planck scale is ensured by construction and the successful
predictions for inflation are accommodated. The conformal gravity coupling for
the Higgs field leads to the proximity of the effective Planck mass to zero in
the Jordan frame during inflation, corresponding to a pole in the Higgs kinetic
term in the Einstein frame. Requiring the Higgs potential to vanish at the
conformal pole in the effective theory in the Jordan frame, we make a robust
prediction of the successful Higgs inflation. For a successful Higgs inflation
at the pole, we take the running quartic coupling for the Higgs field to be
small enough at the inflation scale, being consistent with the low-energy data,
but we need a nontrivial extension of the SM with extra scalar or gauge fields
in order to keep the running Higgs quartic coupling small during inflation.
Performing the perturbative analysis of reheating with the known couplings of
the SM particles to the Higgs boson, we show that a concrete realization of the
Higgs pole inflation can be pinned down by the reheating processes with a
general equation of state for the Higgs inflaton. We illustrate some extensions
of the simple Higgs pole inflation to the general pole expansions, the running
Higgs quartic coupling in the Standard Model and its extension with a singlet
scalar field, a supergravity embedding of the Higgs pole inflation.
|
[
{
"created": "Tue, 13 Jun 2023 13:32:20 GMT",
"version": "v1"
},
{
"created": "Fri, 13 Oct 2023 23:18:56 GMT",
"version": "v2"
}
] |
2023-10-17
|
[
[
"Cléry",
"Simon",
""
],
[
"Lee",
"Hyun Min",
""
],
[
"Menkara",
"Adriana G.",
""
]
] |
We propose a novel possibility for Higgs inflation where the perturbative unitarity below the Planck scale is ensured by construction and the successful predictions for inflation are accommodated. The conformal gravity coupling for the Higgs field leads to the proximity of the effective Planck mass to zero in the Jordan frame during inflation, corresponding to a pole in the Higgs kinetic term in the Einstein frame. Requiring the Higgs potential to vanish at the conformal pole in the effective theory in the Jordan frame, we make a robust prediction of the successful Higgs inflation. For a successful Higgs inflation at the pole, we take the running quartic coupling for the Higgs field to be small enough at the inflation scale, being consistent with the low-energy data, but we need a nontrivial extension of the SM with extra scalar or gauge fields in order to keep the running Higgs quartic coupling small during inflation. Performing the perturbative analysis of reheating with the known couplings of the SM particles to the Higgs boson, we show that a concrete realization of the Higgs pole inflation can be pinned down by the reheating processes with a general equation of state for the Higgs inflaton. We illustrate some extensions of the simple Higgs pole inflation to the general pole expansions, the running Higgs quartic coupling in the Standard Model and its extension with a singlet scalar field, a supergravity embedding of the Higgs pole inflation.
|
1312.7854
|
Natsumi Nagata
|
Natsumi Nagata and Satoshi Shirai
|
Sfermion Flavor and Proton Decay in High-Scale Supersymmetry
|
39 pages, 15 figures. Version accepted for publication in JHEP
|
JHEP 1403 (2014) 049
|
10.1007/JHEP03(2014)049
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The discovery of the Higgs boson with a mass of around 125 GeV gives a strong
motivation for further study of a high-scale supersymmetry (SUSY) breaking
model. In this framework, the minimal SUSY SU(5) grand unification model may be
viable since heavy sfermions suppress the proton decay via color-triplet Higgs
exchanges. At the same time, sizable flavor violation in sfermion masses is
still allowed by low-energy precision experiments when the mass scale is as
high as O(100) TeV, which naturally explains the 125 GeV Higgs mass. In the
presence of the sfermon flavor violation, however, the rates and branching
fractions of proton decay can be drastically changed. In this paper, we study
the effects of sfermion flavor structure on proton decay and discuss the
experimental constraints on sfermion flavor violation. We find that
proton-decay experiments may give us a valuable knowledge on sfermon flavor
violation, and by combining it with the results from other low-energy precision
experiments, we can extract insights to the structure of sfermion sector as
well as the underlying grand unification model.
|
[
{
"created": "Mon, 30 Dec 2013 20:23:55 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Mar 2014 20:29:11 GMT",
"version": "v2"
}
] |
2014-03-18
|
[
[
"Nagata",
"Natsumi",
""
],
[
"Shirai",
"Satoshi",
""
]
] |
The discovery of the Higgs boson with a mass of around 125 GeV gives a strong motivation for further study of a high-scale supersymmetry (SUSY) breaking model. In this framework, the minimal SUSY SU(5) grand unification model may be viable since heavy sfermions suppress the proton decay via color-triplet Higgs exchanges. At the same time, sizable flavor violation in sfermion masses is still allowed by low-energy precision experiments when the mass scale is as high as O(100) TeV, which naturally explains the 125 GeV Higgs mass. In the presence of the sfermon flavor violation, however, the rates and branching fractions of proton decay can be drastically changed. In this paper, we study the effects of sfermion flavor structure on proton decay and discuss the experimental constraints on sfermion flavor violation. We find that proton-decay experiments may give us a valuable knowledge on sfermon flavor violation, and by combining it with the results from other low-energy precision experiments, we can extract insights to the structure of sfermion sector as well as the underlying grand unification model.
|
1408.5325
|
Matthieu Jaquier
|
X. Chen, T. Gehrmann, E.W.N. Glover, M. Jaquier
|
Precise QCD predictions for the production of Higgs+jet final states
| null | null |
10.1016/j.physletb.2014.11.021
|
IPPP/14/64, ZU-TH 27/14
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We compute the cross section and differential distributions for the
production of a Standard Model Higgs boson in association with a hadronic jet
to next-to-next-to-leading order in quantum chromodynamics (QCD). In Higgs
boson studies at the LHC, final states containing one jet are a dominant
contribution to the total event rate, and their understanding is crucial for
improved determinations of the Higgs boson properties. We observe substantial
higher order corrections to transverse momentum spectra and rapidity
distributions in Higgs-plus-one-jet final states. Their inclusion stabilises
the residual theoretical uncertainty of the predictions around 9\%, thereby
providing important input to precision studies of the Higgs boson.
|
[
{
"created": "Fri, 22 Aug 2014 15:25:24 GMT",
"version": "v1"
}
] |
2015-06-22
|
[
[
"Chen",
"X.",
""
],
[
"Gehrmann",
"T.",
""
],
[
"Glover",
"E. W. N.",
""
],
[
"Jaquier",
"M.",
""
]
] |
We compute the cross section and differential distributions for the production of a Standard Model Higgs boson in association with a hadronic jet to next-to-next-to-leading order in quantum chromodynamics (QCD). In Higgs boson studies at the LHC, final states containing one jet are a dominant contribution to the total event rate, and their understanding is crucial for improved determinations of the Higgs boson properties. We observe substantial higher order corrections to transverse momentum spectra and rapidity distributions in Higgs-plus-one-jet final states. Their inclusion stabilises the residual theoretical uncertainty of the predictions around 9\%, thereby providing important input to precision studies of the Higgs boson.
|
hep-ph/0507154
|
Yann Mambrini
|
Y. Mambrini
|
Astroparticle and Collider Physics as complementary sources for the
study of string motivated supergravity models
|
4 pages, 1 figure, to appear in the proceedings of International
Conference on Linear Colliders (LCWS 05), Stanford, USA, 18-22 Mar 2005
| null | null | null |
hep-ph
| null |
We provide a study of the phenomenology of heterotic orbifold
compactifications scenarii within the context of supergravity effective
theories. Our investigation focuses on those models where the soft Lagrangian
is dominated by loop contributions to the various soft supersymmetry breaking
parameters, giving a mixed anomaly-gravity mediation model. We consider the
pattern of masses that are governed by these soft terms and investigate the
implications of certain indirect constraints on supersymmetric models. In this
framework, we point out how the complementarity between direct and indirect
detection of a neutralino Dark Matter, and futur accelerator prospects can
reduce considerably the parameter space of such models
|
[
{
"created": "Wed, 13 Jul 2005 12:37:47 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Mambrini",
"Y.",
""
]
] |
We provide a study of the phenomenology of heterotic orbifold compactifications scenarii within the context of supergravity effective theories. Our investigation focuses on those models where the soft Lagrangian is dominated by loop contributions to the various soft supersymmetry breaking parameters, giving a mixed anomaly-gravity mediation model. We consider the pattern of masses that are governed by these soft terms and investigate the implications of certain indirect constraints on supersymmetric models. In this framework, we point out how the complementarity between direct and indirect detection of a neutralino Dark Matter, and futur accelerator prospects can reduce considerably the parameter space of such models
|
1201.5064
|
C. J. A. P. Martins
|
M. F. Oliveira, A. Avgoustidis and C. J. A. P. Martins
|
Cosmic string evolution with a conserved charge
|
12 pages, 4 figures; submitted to Phys. Rev. D
| null |
10.1103/PhysRevD.85.083515
| null |
hep-ph astro-ph.CO gr-qc hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Cosmic strings with degrees of freedom beyond the standard
Abrikosov-Nielsen-Olesen or Nambu-Goto strings are ubiquitous in field theory
as well as in models with extra dimensions, such as string theoretic brane
inflation scenarios. Here we carry out an analytic study of a simplified
version of one such cosmic string model. Specifically, we extend the
velocity-dependent one-scale (VOS) string evolution model to the case where
there is a conserved microscopic charge on the string worldsheet. We find that
whether the standard scale-invariant evolution of the network is preserved or
destroyed due to the presence of the charge will crucially depend on the amount
of damping and energy losses experienced by the network. This suggests, among
other things, that results derived in Minkowski space (field theory)
simulations may not extend to the case of an expanding universe.
|
[
{
"created": "Tue, 24 Jan 2012 17:50:15 GMT",
"version": "v1"
}
] |
2015-06-03
|
[
[
"Oliveira",
"M. F.",
""
],
[
"Avgoustidis",
"A.",
""
],
[
"Martins",
"C. J. A. P.",
""
]
] |
Cosmic strings with degrees of freedom beyond the standard Abrikosov-Nielsen-Olesen or Nambu-Goto strings are ubiquitous in field theory as well as in models with extra dimensions, such as string theoretic brane inflation scenarios. Here we carry out an analytic study of a simplified version of one such cosmic string model. Specifically, we extend the velocity-dependent one-scale (VOS) string evolution model to the case where there is a conserved microscopic charge on the string worldsheet. We find that whether the standard scale-invariant evolution of the network is preserved or destroyed due to the presence of the charge will crucially depend on the amount of damping and energy losses experienced by the network. This suggests, among other things, that results derived in Minkowski space (field theory) simulations may not extend to the case of an expanding universe.
|
2007.09158
|
Alberto Tonero Dr.
|
C. S. Fong, T. Gregoire, A. Tonero
|
Testing quasi-Dirac leptogenesis through neutrino oscillations
|
14 pages, 1 figure, PLB version
| null |
10.1016/j.physletb.2021.136175
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The lightness of the Standard Model (SM) neutrinos could be understood if
their masses were to be generated by new physics at a high scale, through the
so-called seesaw mechanism involving heavy fermion singlets. If new physics
violates baryon minus lepton number by only a small amount, the heavy fermion
singlets as well as the SM neutrinos split into pairs of quasi-Dirac states. At
the scale of the fermion singlets, this quasi-Diracness allows to enhance CP
violation in their decays and the cosmic matter-antimatter asymmetry can be
successfully generated through resonant leptogenesis. At lower scale, this
quasi-Diracness results in small SM neutrino mass splitting which can be probed
in oscillation experiments. Remarkably, the parameter space for viable
leptogenesis spans over the regime relevant for solar and atmospheric neutrino
oscillations.
|
[
{
"created": "Fri, 17 Jul 2020 18:00:07 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Jun 2021 02:28:22 GMT",
"version": "v2"
}
] |
2021-06-09
|
[
[
"Fong",
"C. S.",
""
],
[
"Gregoire",
"T.",
""
],
[
"Tonero",
"A.",
""
]
] |
The lightness of the Standard Model (SM) neutrinos could be understood if their masses were to be generated by new physics at a high scale, through the so-called seesaw mechanism involving heavy fermion singlets. If new physics violates baryon minus lepton number by only a small amount, the heavy fermion singlets as well as the SM neutrinos split into pairs of quasi-Dirac states. At the scale of the fermion singlets, this quasi-Diracness allows to enhance CP violation in their decays and the cosmic matter-antimatter asymmetry can be successfully generated through resonant leptogenesis. At lower scale, this quasi-Diracness results in small SM neutrino mass splitting which can be probed in oscillation experiments. Remarkably, the parameter space for viable leptogenesis spans over the regime relevant for solar and atmospheric neutrino oscillations.
|
hep-ph/0201161
|
Lance Dixon
|
Zvi Bern, Abilio De Freitas, and Lance Dixon
|
Two-Loop Helicity Amplitudes for Gluon-Gluon Scattering in QCD and
Supersymmetric Yang-Mills Theory
|
55 pages, 3 figures, corrected remark below eq. (4.33), other minor
changes, version appearing in JHEP
|
JHEP 0203:018,2002
|
10.1088/1126-6708/2002/03/018
|
SLAC-PUB-9103, UCLA/02/TEP/1
|
hep-ph
| null |
We present the two-loop helicity amplitudes for the scattering of two gluons
into two gluons in QCD, which are relevant for next-to-next-to-leading order
corrections to jet production at hadron colliders. We give the results in the
`t Hooft-Veltman and four-dimensional helicity variants of dimensional
regularization. Summing our expressions over helicities and colors, and
converting to conventional dimensional regularization, gives results in
complete agreement with those of Glover, Oleari and Tejeda-Yeomans. We also
present the amplitudes for 2 to 2 scattering in pure N=1 supersymmetric
Yang-Mills theory.
|
[
{
"created": "Thu, 17 Jan 2002 20:11:23 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Mar 2002 11:40:34 GMT",
"version": "v2"
}
] |
2010-04-06
|
[
[
"Bern",
"Zvi",
""
],
[
"De Freitas",
"Abilio",
""
],
[
"Dixon",
"Lance",
""
]
] |
We present the two-loop helicity amplitudes for the scattering of two gluons into two gluons in QCD, which are relevant for next-to-next-to-leading order corrections to jet production at hadron colliders. We give the results in the `t Hooft-Veltman and four-dimensional helicity variants of dimensional regularization. Summing our expressions over helicities and colors, and converting to conventional dimensional regularization, gives results in complete agreement with those of Glover, Oleari and Tejeda-Yeomans. We also present the amplitudes for 2 to 2 scattering in pure N=1 supersymmetric Yang-Mills theory.
|
2212.02905
|
Admir Greljo
|
Sally Dawson, Admir Greljo, Kristin Lohwasser, Jason Aebischer,
Supratim Das Bakshi, Adri\'an Carmona, Joydeep Chakrabortty, Timothy Cohen,
Juan Carlos Criado, Javier Fuentes-Mart\'in, Achilleas Lazopoulos, Xiaochuan
Lu, Stefano Di Noi, Pablo Olgoso, Sunando Kumar Patra, Jos\'e Santiago, Luca
Silvestrini, Anders Eller Thomsen, Zhengkang Zhang
|
LHC EFT WG Note: Precision matching of microscopic physics to the
Standard Model Effective Field Theory (SMEFT)
|
23 pages, 2 figures
| null | null |
CERN-LHCEFTWG-2022-002, CERN-LPCC-2022-07
|
hep-ph hep-ex hep-th
|
http://creativecommons.org/licenses/by/4.0/
|
This note gives an overview of the tools for the precision matching of
ultraviolet theories to the Standard Model effective field theory (SMEFT) at
the tree level and one loop. Several semi- and fully automated codes are
presented, as well as some supplementary codes for the basis conversion and the
subsequent running and matching at low energies. A suggestion to collect
information for cross-validations of current and future codes is made.
|
[
{
"created": "Tue, 6 Dec 2022 12:00:43 GMT",
"version": "v1"
}
] |
2022-12-07
|
[
[
"Dawson",
"Sally",
""
],
[
"Greljo",
"Admir",
""
],
[
"Lohwasser",
"Kristin",
""
],
[
"Aebischer",
"Jason",
""
],
[
"Bakshi",
"Supratim Das",
""
],
[
"Carmona",
"Adrián",
""
],
[
"Chakrabortty",
"Joydeep",
""
],
[
"Cohen",
"Timothy",
""
],
[
"Criado",
"Juan Carlos",
""
],
[
"Fuentes-Martín",
"Javier",
""
],
[
"Lazopoulos",
"Achilleas",
""
],
[
"Lu",
"Xiaochuan",
""
],
[
"Di Noi",
"Stefano",
""
],
[
"Olgoso",
"Pablo",
""
],
[
"Patra",
"Sunando Kumar",
""
],
[
"Santiago",
"José",
""
],
[
"Silvestrini",
"Luca",
""
],
[
"Thomsen",
"Anders Eller",
""
],
[
"Zhang",
"Zhengkang",
""
]
] |
This note gives an overview of the tools for the precision matching of ultraviolet theories to the Standard Model effective field theory (SMEFT) at the tree level and one loop. Several semi- and fully automated codes are presented, as well as some supplementary codes for the basis conversion and the subsequent running and matching at low energies. A suggestion to collect information for cross-validations of current and future codes is made.
|
1401.1235
|
Adam Martin
|
Zhenyu Han, Graham D. Kribs, Adam Martin, Arjun Menon
|
Hunting Quasi-Degenerate Higgsinos
|
25 pages, 12 figures, 3 tables
|
Phys. Rev. D 89, 075007 (2014)
|
10.1103/PhysRevD.89.075007
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a new strategy to uncover light, quasi-degenerate Higgsinos, a
likely ingredient in a natural supersymmetric model. Our strategy focuses on
Higgsinos with inter-state splittings of O(5-50) GeV that are produced in
association with a hard, initial state jet and decay via off-shell gauge bosons
to two or more leptons and missing energy, $pp \to j + \text{MET}\, + 2^+\,
\ell$. The additional jet is used for triggering, allowing us to significantly
loosen the lepton requirements and gain sensitivity to small inter-Higgsino
splittings. Focusing on the two-lepton signal, we find the seemingly large
backgrounds from diboson plus jet, $\bar tt$ and $Z/\gamma^* + j$ can be
reduced with careful cuts, and that fake backgrounds appear minor. For Higgsino
masses $m_{\chi}$ just above the current LEP II bound ($\mu \simeq 110\,$) GeV
we find the significance can be as high as 3 sigma at the LHC using the
existing 20 fb$^{-1}$ of 8 TeV data. Extrapolating to LHC at 14 TeV with 100
fb$^{-1}$ data, and as one example $M_1 = M_2 = 500$ GeV, we find 5 sigma
evidence for $m_{\chi} \lesssim\, 140\,$ GeV and 2 sigma evidence for $m_{\chi}
\lesssim\, 200\,$ GeV . We also present a reinterpretation of ATLAS/CMS monojet
bounds in terms of degenerate Higgsino ($\delta m_{\chi} \ll 5\,$) GeV plus jet
production. We find the current monojet bounds on $m_{\chi}$ are no better than
the chargino bounds from LEP II.
|
[
{
"created": "Mon, 6 Jan 2014 23:08:13 GMT",
"version": "v1"
}
] |
2014-04-23
|
[
[
"Han",
"Zhenyu",
""
],
[
"Kribs",
"Graham D.",
""
],
[
"Martin",
"Adam",
""
],
[
"Menon",
"Arjun",
""
]
] |
We present a new strategy to uncover light, quasi-degenerate Higgsinos, a likely ingredient in a natural supersymmetric model. Our strategy focuses on Higgsinos with inter-state splittings of O(5-50) GeV that are produced in association with a hard, initial state jet and decay via off-shell gauge bosons to two or more leptons and missing energy, $pp \to j + \text{MET}\, + 2^+\, \ell$. The additional jet is used for triggering, allowing us to significantly loosen the lepton requirements and gain sensitivity to small inter-Higgsino splittings. Focusing on the two-lepton signal, we find the seemingly large backgrounds from diboson plus jet, $\bar tt$ and $Z/\gamma^* + j$ can be reduced with careful cuts, and that fake backgrounds appear minor. For Higgsino masses $m_{\chi}$ just above the current LEP II bound ($\mu \simeq 110\,$) GeV we find the significance can be as high as 3 sigma at the LHC using the existing 20 fb$^{-1}$ of 8 TeV data. Extrapolating to LHC at 14 TeV with 100 fb$^{-1}$ data, and as one example $M_1 = M_2 = 500$ GeV, we find 5 sigma evidence for $m_{\chi} \lesssim\, 140\,$ GeV and 2 sigma evidence for $m_{\chi} \lesssim\, 200\,$ GeV . We also present a reinterpretation of ATLAS/CMS monojet bounds in terms of degenerate Higgsino ($\delta m_{\chi} \ll 5\,$) GeV plus jet production. We find the current monojet bounds on $m_{\chi}$ are no better than the chargino bounds from LEP II.
|
1808.01601
|
Abdullatif \c{C}al{\i}\c{s}kan <
|
A. Caliskan
|
Single production of composite electrons at the future SPPC-based
lepton-hadron colliders
|
21 pages, 9 figures, 6 tables
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider the production of excited electrons with spin-1/2 at the future
SPPC-based electron-proton colliders with center-of-mass energies of $8.4$,
$11.6$, $26.6$ and $36.8$ TeV. These exotic particles are predicted in the
composite models. We calculate the production cross-sections and concentrate on
the photon decay channel of the excited electrons with the process of
$ep\rightarrow e^{\star}X\rightarrow e\gamma X$ . The pseudorapidity and
transverse momentum distributions of the electrons and photons in the
final-state have been plotted in order to determine the kinematical cuts best
suited for discovery of the excited electrons. By applying these cuts we
compute $2\sigma$, $3\sigma$ and $5\sigma$ contour plots of the statistical
significance of the expected signal in the parameter space ($L$, $m^{\star}$),
where $L$ denotes the integrated luminosity of the collider and $m^{\star}$ is
the mass of the composite electrons.
|
[
{
"created": "Sun, 5 Aug 2018 11:56:07 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Apr 2019 12:55:28 GMT",
"version": "v2"
}
] |
2019-04-17
|
[
[
"Caliskan",
"A.",
""
]
] |
We consider the production of excited electrons with spin-1/2 at the future SPPC-based electron-proton colliders with center-of-mass energies of $8.4$, $11.6$, $26.6$ and $36.8$ TeV. These exotic particles are predicted in the composite models. We calculate the production cross-sections and concentrate on the photon decay channel of the excited electrons with the process of $ep\rightarrow e^{\star}X\rightarrow e\gamma X$ . The pseudorapidity and transverse momentum distributions of the electrons and photons in the final-state have been plotted in order to determine the kinematical cuts best suited for discovery of the excited electrons. By applying these cuts we compute $2\sigma$, $3\sigma$ and $5\sigma$ contour plots of the statistical significance of the expected signal in the parameter space ($L$, $m^{\star}$), where $L$ denotes the integrated luminosity of the collider and $m^{\star}$ is the mass of the composite electrons.
|
1303.1087
|
Luca Merlo Dr.
|
Laura Lopez-Honorez and Luca Merlo
|
Dark matter within the minimal flavour violation ansatz
|
11 pages, 2 figures; v2: references added, version published on
Phys.Lett.B
| null |
10.1016/j.physletb.2013.04.015
|
FTUAM-13-129, IFT-UAM/CSIC-13-018, CERN-PH-TH/2013-034
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Minimal Flavour Violation hypothesis can provide an attractive framework for
Dark Matter (DM). We consider scalar DM candidates carrying flavour quantum
numbers and whose representation under the flavour group guarantees DM
stability. They interact with the Standard Model fields through Higgs portal at
renormalisable level and also to quarks through dimension-6 operators. We
provide a systematic analysis of the viable parameter space for the DM fields,
which are triplet of the flavour group, considering several DM-quark
interactions. In this framework, we analyse in which cases the viable parameter
space differs from Higgs portal models thanks to the underlying flavour
structure. In contrast to minimal Higgs portal scenarios, we find that light DM
in the GeV mass range as well as heavier candidates above Higgs resonance could
be allowed by colliders, direct and indirect DM detection searches as well as
flavour constraints. The large mass regime above the top mass could even be
beyond the reach of future experiments such as Xenon 1T.
|
[
{
"created": "Tue, 5 Mar 2013 16:29:49 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Apr 2013 08:53:46 GMT",
"version": "v2"
}
] |
2015-06-15
|
[
[
"Lopez-Honorez",
"Laura",
""
],
[
"Merlo",
"Luca",
""
]
] |
Minimal Flavour Violation hypothesis can provide an attractive framework for Dark Matter (DM). We consider scalar DM candidates carrying flavour quantum numbers and whose representation under the flavour group guarantees DM stability. They interact with the Standard Model fields through Higgs portal at renormalisable level and also to quarks through dimension-6 operators. We provide a systematic analysis of the viable parameter space for the DM fields, which are triplet of the flavour group, considering several DM-quark interactions. In this framework, we analyse in which cases the viable parameter space differs from Higgs portal models thanks to the underlying flavour structure. In contrast to minimal Higgs portal scenarios, we find that light DM in the GeV mass range as well as heavier candidates above Higgs resonance could be allowed by colliders, direct and indirect DM detection searches as well as flavour constraints. The large mass regime above the top mass could even be beyond the reach of future experiments such as Xenon 1T.
|
1406.0061
|
G.R. Boroun
|
G.R.Boroun
|
The ratio of the beauty structure functions $R^b = F^b_L/F^b_2$ at low x
|
12 pages, 5 figurs, 1 table. arXiv admin note: text overlap with
arXiv:hep-ph/0603017 by other authors
|
Nucl.Phys.B 884(2014)684
|
10.1016/j.nuclphysb.2014.05.010
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the structure functions $F_{k}^{b}(x,Q^{2})$ ($k=2, L$) and the
reduced cross section $\sigma_{r}^{b}(x,Q^{2})$ for small values of
Bjorken$^{,}$s $x$ variable with respect to the hard (Lipatov) pomeron for the
gluon distribution and provide a compact formula for the ratio $R^{b}$ that is
useful to extract the beauty structure function from the beauty reduced cross
section, in particular at DESY HERA. Also we show that the effects of the
nonlinear corrections to the gluon distribution tame the behavior of the beauty
structure function and the beauty reduced cross section at low $x$.
|
[
{
"created": "Sat, 31 May 2014 09:56:12 GMT",
"version": "v1"
}
] |
2014-06-03
|
[
[
"Boroun",
"G. R.",
""
]
] |
We study the structure functions $F_{k}^{b}(x,Q^{2})$ ($k=2, L$) and the reduced cross section $\sigma_{r}^{b}(x,Q^{2})$ for small values of Bjorken$^{,}$s $x$ variable with respect to the hard (Lipatov) pomeron for the gluon distribution and provide a compact formula for the ratio $R^{b}$ that is useful to extract the beauty structure function from the beauty reduced cross section, in particular at DESY HERA. Also we show that the effects of the nonlinear corrections to the gluon distribution tame the behavior of the beauty structure function and the beauty reduced cross section at low $x$.
|
2403.18696
|
Wei Chen
|
Ding-Kun Lian, Qi-Nan Wang, Xu-Liang Chen, Peng-Fei Yang, Wei Chen and
Hua-Xing Chen
|
Revisit the heavy quarkonium double-gluon hybrid mesons with exotic
quantum numbers
|
34 pages, 6 figures. Version to appear in JHEP
|
JHEP06(2024)173
|
10.1007/JHEP06(2024)173
| null |
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
We revisit the masses of heavy quarkonium double-gluon hybrid mesons with
exotic quantum numbers $J^{PC}=1^{-+}$ and $2^{+-}$ in the framework of the QCD
sum rules. Considering the double-gluon hybrid meson operators in the
octet-octet color structure, we have constructed two independent interpolating
currents with $J^{PC}=1^{-+}$ and five independent currents with
$J^{PC}=2^{+-}$. For the interpolating currents with antisymmetric glueball
operator, there exist non-local divergences in one kind of additional Feynman
diagrams of the tri-gluon condensate, which will give important contributions
to the sum rule stabilities and mass predictions. We use the diagrammatic
renormalization to cancel out such divergences. At the leading order of
$\alpha_s$, the two-point correlation functions and spectral densities can be
expressed in the analytic form of the generalized hypergeometric functions and
Meijer's G-functions. After performing the numerical analysis, we predict the
masses of the $1^{-+}$ and $2^{+-}$ charmonium double-gluon hybrid mesons to be
around $6.1-7.2$ GeV and $6.3-6.4$ GeV, respectively. For the bottomonium
systems, their masses are predicted to be $13.7-14.3$ GeV and $12.6-13.3$ GeV
for the $1^{-+}$ and $2^{+-}$ channels, respectively. Besides, it is possible
to hunt for these charmonium hybrids in the radiative decays of bottomonium
mesons in BelleII experiment. Further investigations on these hybrid states in
various theoretical and phenomenological methods are also anticipated in the
future.
|
[
{
"created": "Wed, 27 Mar 2024 15:46:01 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Mar 2024 16:39:54 GMT",
"version": "v2"
},
{
"created": "Fri, 28 Jun 2024 01:59:04 GMT",
"version": "v3"
}
] |
2024-07-01
|
[
[
"Lian",
"Ding-Kun",
""
],
[
"Wang",
"Qi-Nan",
""
],
[
"Chen",
"Xu-Liang",
""
],
[
"Yang",
"Peng-Fei",
""
],
[
"Chen",
"Wei",
""
],
[
"Chen",
"Hua-Xing",
""
]
] |
We revisit the masses of heavy quarkonium double-gluon hybrid mesons with exotic quantum numbers $J^{PC}=1^{-+}$ and $2^{+-}$ in the framework of the QCD sum rules. Considering the double-gluon hybrid meson operators in the octet-octet color structure, we have constructed two independent interpolating currents with $J^{PC}=1^{-+}$ and five independent currents with $J^{PC}=2^{+-}$. For the interpolating currents with antisymmetric glueball operator, there exist non-local divergences in one kind of additional Feynman diagrams of the tri-gluon condensate, which will give important contributions to the sum rule stabilities and mass predictions. We use the diagrammatic renormalization to cancel out such divergences. At the leading order of $\alpha_s$, the two-point correlation functions and spectral densities can be expressed in the analytic form of the generalized hypergeometric functions and Meijer's G-functions. After performing the numerical analysis, we predict the masses of the $1^{-+}$ and $2^{+-}$ charmonium double-gluon hybrid mesons to be around $6.1-7.2$ GeV and $6.3-6.4$ GeV, respectively. For the bottomonium systems, their masses are predicted to be $13.7-14.3$ GeV and $12.6-13.3$ GeV for the $1^{-+}$ and $2^{+-}$ channels, respectively. Besides, it is possible to hunt for these charmonium hybrids in the radiative decays of bottomonium mesons in BelleII experiment. Further investigations on these hybrid states in various theoretical and phenomenological methods are also anticipated in the future.
|
hep-ph/9407277
| null |
Marc Baillargeon, Paula Franzini
|
Accuracies of K_{e4} Parameters at Daphne
|
11 pages, PSI-PR-94-25
| null | null | null |
hep-ph
| null |
We estimate the experimental accuracies to which the Ke4 parameters will be
measured at DAPHNE. We consider the accuracies obtainable using asymmetries,
and the maximum likelihood method. We find the current determinations of the
relevant parameters will be improved by a factor of five to ten after a year of
running at the anticipated luminosity of DAPHNE.
|
[
{
"created": "Tue, 12 Jul 1994 10:46:38 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Baillargeon",
"Marc",
""
],
[
"Franzini",
"Paula",
""
]
] |
We estimate the experimental accuracies to which the Ke4 parameters will be measured at DAPHNE. We consider the accuracies obtainable using asymmetries, and the maximum likelihood method. We find the current determinations of the relevant parameters will be improved by a factor of five to ten after a year of running at the anticipated luminosity of DAPHNE.
|
1203.1022
|
Vitaly Velizhanin
|
V. N. Velizhanin
|
Three loop anomalous dimension of the non-singlet transversity operator
in QCD
|
30 pages, 4 figures, file with results, minor changes in the text,
references added, confirmation from the recent calculation of N=16
(arXiv:1206.2890) added
| null |
10.1016/j.nuclphysb.2012.06.010
| null |
hep-ph hep-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We calculate the three-loop anomalous dimension of the non-singlet transverse
operator from N=1 to N=15. Using some guess we have reconstructed a general
form of three-loop anomalous dimension for arbitrary Mellin moment N. Obtained
result is transformed into Bjorken-x space by an inverse Mellin transformation.
The final expressions are presented in both Mellin-N and Bjorken-x space.
|
[
{
"created": "Mon, 5 Mar 2012 19:46:01 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Aug 2012 21:41:31 GMT",
"version": "v2"
}
] |
2012-08-22
|
[
[
"Velizhanin",
"V. N.",
""
]
] |
We calculate the three-loop anomalous dimension of the non-singlet transverse operator from N=1 to N=15. Using some guess we have reconstructed a general form of three-loop anomalous dimension for arbitrary Mellin moment N. Obtained result is transformed into Bjorken-x space by an inverse Mellin transformation. The final expressions are presented in both Mellin-N and Bjorken-x space.
|
hep-ph/0206247
|
Hanqing Zheng
|
Zhiguang Xiao and Hanqing Zheng
|
Further remarks on $\pi\pi$ scattering dispersion relations
|
replace with revised version to appear in Chinese Physics Letters.
Numerical calculation improved. $M_\sigma\simeq 483 {\rm
MeV}$,$\Gamma_\sigma\simeq 705 {\rm MeV}$
|
CHIN. PHYS. LETT. 20 (2003)342
|
10.1088/0256-307X/20/3/308
| null |
hep-ph
| null |
The naive use of higher order perturbation theory leads the left--hand cut
integrals in $\pi\pi$ dispersion relations~\cite{hjy,Xiao01} divergent. This
problem is discussed and solved. Also we point out that the Adler zero
condition imposes three constraints on the dispersion relations. The $\sigma $
pole position is determined using the improved method, $M_\sigma= 483\pm 13
{\rm MeV}$,$\Gamma_\sigma=
705 \pm 50{\rm MeV}$. The scattering length parameter is found to be in
excellent agreement with the experimental result.
|
[
{
"created": "Tue, 25 Jun 2002 06:20:14 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Jan 2003 07:30:26 GMT",
"version": "v2"
}
] |
2009-11-07
|
[
[
"Xiao",
"Zhiguang",
""
],
[
"Zheng",
"Hanqing",
""
]
] |
The naive use of higher order perturbation theory leads the left--hand cut integrals in $\pi\pi$ dispersion relations~\cite{hjy,Xiao01} divergent. This problem is discussed and solved. Also we point out that the Adler zero condition imposes three constraints on the dispersion relations. The $\sigma $ pole position is determined using the improved method, $M_\sigma= 483\pm 13 {\rm MeV}$,$\Gamma_\sigma= 705 \pm 50{\rm MeV}$. The scattering length parameter is found to be in excellent agreement with the experimental result.
|
1505.04226
|
Yoshitaka Hatta
|
Yoshitaka Hatta, Akihiko Monnai, Bo-Wen Xiao
|
Flow harmonics $v_n$ at finite density
|
30 pages, 5 figures; v2: figures revised, discussion added, to be
published in PRD
|
Phys. Rev. D 92, 114010 (2015)
|
10.1103/PhysRevD.92.114010
|
YITP-15-39
|
hep-ph nucl-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We generalize the Gubser solution of viscous hydrodynamics by including the
finite density effect and analytically compute the flow harmonics $v_n$. We
explicitly show how $v_n$ and their viscous corrections depend on the chemical
potential. The difference in $v_n$ between particles and antiparticles is also
analytically computed and shown to be proportional to various chemical
potentials and the viscosity. Excellent agreement is obtained between the
results and the available experimental data from the SPS, RHIC and the LHC.
|
[
{
"created": "Sat, 16 May 2015 01:22:54 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Nov 2015 06:04:14 GMT",
"version": "v2"
}
] |
2015-12-09
|
[
[
"Hatta",
"Yoshitaka",
""
],
[
"Monnai",
"Akihiko",
""
],
[
"Xiao",
"Bo-Wen",
""
]
] |
We generalize the Gubser solution of viscous hydrodynamics by including the finite density effect and analytically compute the flow harmonics $v_n$. We explicitly show how $v_n$ and their viscous corrections depend on the chemical potential. The difference in $v_n$ between particles and antiparticles is also analytically computed and shown to be proportional to various chemical potentials and the viscosity. Excellent agreement is obtained between the results and the available experimental data from the SPS, RHIC and the LHC.
|
hep-ph/9909331
|
Stefan Kretzer
|
S. Kretzer (Dortmund U.)
|
Massless Parton Asymptotics within Variable Flavour Number Schemes
|
9 pages, 2 figures, minor modifications for publication in PLB
|
Phys.Lett. B471 (1999) 227-232
| null |
DO-TH 99/18
|
hep-ph
| null |
In this note we formulate and investigate theoretical uncertainties for high
Q^2 deep inelastic heavy quark (charm, etc.) production rates which arise
within collinear resummation techniques from variations of the a priori unknown
charm input scale Q_0 of O(alpha_s) variable flavour number schemes. We show
that Q_0 variations constitute a source of considerable theoretical uncertainty
of present O(alpha_s) calculations within such schemes and we suggest to
consider a scale optimization from higher order corrections. We also outline
how the stability of the fixed order and collinearly resummed perturbation
series for heavy quark production can be comparatively investigated by
variation of Q_0.
|
[
{
"created": "Sun, 12 Sep 1999 17:46:45 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Nov 1999 09:55:31 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Kretzer",
"S.",
"",
"Dortmund U."
]
] |
In this note we formulate and investigate theoretical uncertainties for high Q^2 deep inelastic heavy quark (charm, etc.) production rates which arise within collinear resummation techniques from variations of the a priori unknown charm input scale Q_0 of O(alpha_s) variable flavour number schemes. We show that Q_0 variations constitute a source of considerable theoretical uncertainty of present O(alpha_s) calculations within such schemes and we suggest to consider a scale optimization from higher order corrections. We also outline how the stability of the fixed order and collinearly resummed perturbation series for heavy quark production can be comparatively investigated by variation of Q_0.
|
1301.3493
|
Maximilian Stahlhofen
|
Maximilian Stahlhofen
|
Bottom Mass from Nonrelativistic Sum Rules at NNLL
|
9 pages, 3 figures, to appear in the proceedings of Xth Quark
Confinement and the Hadron Spectrum; minor changes, references added
| null | null |
DESY 13-008; UWThPh-2013-3
|
hep-ph hep-ex hep-lat
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We report on a recent determination of the bottom quark mass from
nonrelativistic (large-n) Upsilon sum rules with renormalization group
improvement (RGI) at next-to-next-to-leading logarithmic (NNLL) order. The
comparison to previous fixed-order analyses shows that the RGI computed in the
vNRQCD framework leads to a substantial stabilization of the theoretical sum
rule moments with respect to scale variations. A single moment fit (n=10) to
the available experimental data yields M_b^{1S}=4.755 +- 0.057(pert) +-
0.009(alpha_s) +- 0.003(exp) GeV for the bottom 1S mass and m_b(m_b)= 4.235 +-
0.055(pert) +- 0.003(exp) GeV for the bottom MSbar mass. The quoted
uncertainties refer to the perturbative error and the uncertainties associated
with the strong coupling and the experimental input.
|
[
{
"created": "Tue, 15 Jan 2013 21:00:02 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Jan 2013 19:17:56 GMT",
"version": "v2"
},
{
"created": "Thu, 24 Jan 2013 15:32:56 GMT",
"version": "v3"
}
] |
2013-01-25
|
[
[
"Stahlhofen",
"Maximilian",
""
]
] |
We report on a recent determination of the bottom quark mass from nonrelativistic (large-n) Upsilon sum rules with renormalization group improvement (RGI) at next-to-next-to-leading logarithmic (NNLL) order. The comparison to previous fixed-order analyses shows that the RGI computed in the vNRQCD framework leads to a substantial stabilization of the theoretical sum rule moments with respect to scale variations. A single moment fit (n=10) to the available experimental data yields M_b^{1S}=4.755 +- 0.057(pert) +- 0.009(alpha_s) +- 0.003(exp) GeV for the bottom 1S mass and m_b(m_b)= 4.235 +- 0.055(pert) +- 0.003(exp) GeV for the bottom MSbar mass. The quoted uncertainties refer to the perturbative error and the uncertainties associated with the strong coupling and the experimental input.
|
0705.4224
|
Antonio Pineda
|
Antonio Pineda
|
Non-relativistic Quantum Mechanics versus Quantum Field Theories
|
4 pages, 6 figures. Invited talk given at 42nd Rencontres de Moriond
on QCD and High-Energy Hadronic Interactions, La Thuile, March 2007
| null | null | null |
hep-ph
| null |
We briefly review the derivation of a non-relativistic quantum mechanics
description of a weakly bound non-relativistic system from the underlying
quantum field theory. We highlight the main techniques used.
|
[
{
"created": "Tue, 29 May 2007 14:15:28 GMT",
"version": "v1"
}
] |
2007-05-30
|
[
[
"Pineda",
"Antonio",
""
]
] |
We briefly review the derivation of a non-relativistic quantum mechanics description of a weakly bound non-relativistic system from the underlying quantum field theory. We highlight the main techniques used.
|
hep-ph/0601255
|
Stefan Michalski
|
Stefan Michalski
|
Chiral and U(1) axial symmetry restoration in linear sigma models with
two quark flavors
|
23 pages, 19 figures. RevTex style. Text restructured, references
added. New results and figures for chiral limit added
| null | null |
DO-TH 06/01
|
hep-ph nucl-th
| null |
We study the restoration of chiral symmetry in linear sigma models with two
quark flavors. The models taken into consideration have a U(2)_L x U(2)_R and
an O(4) internal symmetry. The physical mesons of these models are sigma, pion,
eta and a_0 where the latter two are not present in the O(4) model. Including
two-loop contributions through sunset graphs we calculate the temperature
behavior of the order parameter and the masses for explicit chiral symmetry
breaking and in the chiral limit. Decay threshold effects introduced by the
sunset graphs alter the temperature dependence of the condensate and
consequently that of the masses as well. This correctly reproduces a
second-order phase transition for the O(4) model and for the U(2)_L x U(2)_R
model with an axial U(1) anomaly as expected from universality class arguments.
Chiral symmetry tends to be restored at higher temperatures in the two-loop
approximation than in the Hartree-Fock approximation. To model a restoration of
the axial U(1) symmetry we imply a temperature-dependent anomaly parameter that
sharply drops at about 175 MeV. This triggers the restoration of chiral
symmetry before the full symmetry is restored and lowers the transition
temperatures significantly below 200 MeV.
|
[
{
"created": "Mon, 30 Jan 2006 20:54:00 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Jan 2006 22:25:31 GMT",
"version": "v2"
},
{
"created": "Fri, 7 Apr 2006 12:24:15 GMT",
"version": "v3"
}
] |
2007-05-23
|
[
[
"Michalski",
"Stefan",
""
]
] |
We study the restoration of chiral symmetry in linear sigma models with two quark flavors. The models taken into consideration have a U(2)_L x U(2)_R and an O(4) internal symmetry. The physical mesons of these models are sigma, pion, eta and a_0 where the latter two are not present in the O(4) model. Including two-loop contributions through sunset graphs we calculate the temperature behavior of the order parameter and the masses for explicit chiral symmetry breaking and in the chiral limit. Decay threshold effects introduced by the sunset graphs alter the temperature dependence of the condensate and consequently that of the masses as well. This correctly reproduces a second-order phase transition for the O(4) model and for the U(2)_L x U(2)_R model with an axial U(1) anomaly as expected from universality class arguments. Chiral symmetry tends to be restored at higher temperatures in the two-loop approximation than in the Hartree-Fock approximation. To model a restoration of the axial U(1) symmetry we imply a temperature-dependent anomaly parameter that sharply drops at about 175 MeV. This triggers the restoration of chiral symmetry before the full symmetry is restored and lowers the transition temperatures significantly below 200 MeV.
|
1608.05201
|
Zhi-Hui Wang
|
Zhi-Hui Wang, Yi Zhang, Libo Jiang, Tian-Hong Wang, Yue Jiang, Guo-Li
Wang
|
The Strong Decays of X(3940) and X(4160)
|
14 pages, 4 figures. arXiv admin note: text overlap with
arXiv:1605.09091
| null |
10.1140/epjc/s10052-017-4596-0
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The new mesons $X(3940)$ and $X(4160)$ have been found by Belle Collaboration
in the processes $e^+e^-\to J/\psi D^{(*)}\bar D^{(*)}$. Considering $X(3940)$
and $X(4160)$ as $\eta_c(3S)$ and $\eta_c(4S)$ states, the two-body open charm
OZI-allowed strong decay of $\eta_c(3S)$ and $\eta_c(4S)$ are studied by the
improved Bethe-Salpeter method combine with the $^3P_0$ model. The strong decay
width of $\eta_c(3S)$ is $\Gamma_{\eta_c(3S)}=(33.5^{+18.4}_{-15.3})$ MeV,
which is closed to the result of $X(3940)$, therefore, $\eta_c(3S)$ is a good
candidate of $X(3940)$. The strong decay width of $\eta_c(4S)$ is
$\Gamma_{\eta_c(4S)}=(69.9^{+22.4}_{-21.1})$ MeV, considering the errors of the
results, it's closed to the lower limit of $X(4160)$. But the ratio of the
decay width $\frac{\Gamma(D\bar D^*)}{\Gamma (D^*\bar D^*)}$ of $\eta_c(4S)$ is
larger than the experimental data of $X(4160)$. According to the above
analysis, $\eta_c(4S)$ is not the candidate of $X(4160)$, and more
investigations of $X(4160)$ is needed.
|
[
{
"created": "Thu, 18 Aug 2016 08:01:04 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Dec 2016 09:34:37 GMT",
"version": "v2"
}
] |
2017-03-08
|
[
[
"Wang",
"Zhi-Hui",
""
],
[
"Zhang",
"Yi",
""
],
[
"Jiang",
"Libo",
""
],
[
"Wang",
"Tian-Hong",
""
],
[
"Jiang",
"Yue",
""
],
[
"Wang",
"Guo-Li",
""
]
] |
The new mesons $X(3940)$ and $X(4160)$ have been found by Belle Collaboration in the processes $e^+e^-\to J/\psi D^{(*)}\bar D^{(*)}$. Considering $X(3940)$ and $X(4160)$ as $\eta_c(3S)$ and $\eta_c(4S)$ states, the two-body open charm OZI-allowed strong decay of $\eta_c(3S)$ and $\eta_c(4S)$ are studied by the improved Bethe-Salpeter method combine with the $^3P_0$ model. The strong decay width of $\eta_c(3S)$ is $\Gamma_{\eta_c(3S)}=(33.5^{+18.4}_{-15.3})$ MeV, which is closed to the result of $X(3940)$, therefore, $\eta_c(3S)$ is a good candidate of $X(3940)$. The strong decay width of $\eta_c(4S)$ is $\Gamma_{\eta_c(4S)}=(69.9^{+22.4}_{-21.1})$ MeV, considering the errors of the results, it's closed to the lower limit of $X(4160)$. But the ratio of the decay width $\frac{\Gamma(D\bar D^*)}{\Gamma (D^*\bar D^*)}$ of $\eta_c(4S)$ is larger than the experimental data of $X(4160)$. According to the above analysis, $\eta_c(4S)$ is not the candidate of $X(4160)$, and more investigations of $X(4160)$ is needed.
|
1204.3029
|
David Greynat
|
David Greynat and Eduardo de Rafael
|
Hadronic Contributions to the Muon Anomaly in the Constituent Chiral
Quark Model
|
Several misprints corrected and a clarifying sentence added. Three
figures superposed and two references added. Version to appear in JHEP
| null |
10.1007/JHEP07(2012)020
| null |
hep-ph hep-lat
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The hadronic contributions to the anomalous magnetic moment of the muon which
are relevant for the confrontation between theory and experiment at the present
level of accuracy, are evaluated within the same framework: the constituent
chiral quark model. This includes the contributions from the dominant hadronic
vacuum polarization as well as from the next--to--leading order hadronic vacuum
polarization, the contributions from the hadronic light-by-light scattering,
and the contributions from the electroweak hadronic $Z\gamma\gamma$ vertex.
They are all evaluated as a function of only one free parameter: the
constituent quark mass. We also comment on the comparison between our results
and other phenomenological evaluations.
|
[
{
"created": "Fri, 13 Apr 2012 15:29:40 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Jul 2012 11:33:52 GMT",
"version": "v2"
}
] |
2015-06-04
|
[
[
"Greynat",
"David",
""
],
[
"de Rafael",
"Eduardo",
""
]
] |
The hadronic contributions to the anomalous magnetic moment of the muon which are relevant for the confrontation between theory and experiment at the present level of accuracy, are evaluated within the same framework: the constituent chiral quark model. This includes the contributions from the dominant hadronic vacuum polarization as well as from the next--to--leading order hadronic vacuum polarization, the contributions from the hadronic light-by-light scattering, and the contributions from the electroweak hadronic $Z\gamma\gamma$ vertex. They are all evaluated as a function of only one free parameter: the constituent quark mass. We also comment on the comparison between our results and other phenomenological evaluations.
|
hep-ph/9304257
| null |
M. Ciuchini, E. Franco, G. Martinelli, L. Reina
|
The $\Delta S=1$ Effective Hamiltonian Including Next-to-Leading Order
QCD and QED Corrections
|
59, LaTeX, ENS 93/11, ROME prep. 92/913, ULB-TH 93/03
|
Nucl.Phys. B415 (1994) 403-462
|
10.1016/0550-3213(94)90118-X
| null |
hep-ph
| null |
In this paper we present a calculation of the $\Delta S=1$ effective weak
Hamiltonian including next-to-leading order QCD and QED corrections. At a scale
$\mu$ of the order of few GeV, the Wilson coefficients of the operators are
given in terms of the renormalization group evolution matrix and of the
coefficients computed at a large scale $\sim M_W$. The expression of the
evolution matrix is derived from the two-loop anomalous dimension matrix which
governs the mixing of the relevant current-current and penguin operators,
renormalized in some given regularization scheme. We have computed the
anomalous dimension matrix up to and including order $\alphas^2$ and $\alphae
\alphas$ in two different renormalization schemes, NDR and HV, with consistent
results. We give many details on the calculation of the anomalous dimension
matrix at two loops, on the determination of the Wilson coefficients at the
scale $M_W$ and of their evolution from $M_W$ to $\mu$. We also discuss the
dependence of the Wilson coefficients/operators on the regularization scheme.
|
[
{
"created": "Thu, 15 Apr 1993 16:31:44 GMT",
"version": "v1"
}
] |
2009-10-22
|
[
[
"Ciuchini",
"M.",
""
],
[
"Franco",
"E.",
""
],
[
"Martinelli",
"G.",
""
],
[
"Reina",
"L.",
""
]
] |
In this paper we present a calculation of the $\Delta S=1$ effective weak Hamiltonian including next-to-leading order QCD and QED corrections. At a scale $\mu$ of the order of few GeV, the Wilson coefficients of the operators are given in terms of the renormalization group evolution matrix and of the coefficients computed at a large scale $\sim M_W$. The expression of the evolution matrix is derived from the two-loop anomalous dimension matrix which governs the mixing of the relevant current-current and penguin operators, renormalized in some given regularization scheme. We have computed the anomalous dimension matrix up to and including order $\alphas^2$ and $\alphae \alphas$ in two different renormalization schemes, NDR and HV, with consistent results. We give many details on the calculation of the anomalous dimension matrix at two loops, on the determination of the Wilson coefficients at the scale $M_W$ and of their evolution from $M_W$ to $\mu$. We also discuss the dependence of the Wilson coefficients/operators on the regularization scheme.
|
1811.04214
|
Duojie Jia
|
Duojie Jia and Wen-Chao Dong
|
Regge-like spectra of excited singly heavy mesons
|
This file is created by LateX, with four figures and seven tables
|
Euro. Phys. J. Plus 134(2019)123
|
10.1140/epjp/i2019-12474-8
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this work, we study the Regge-like spectra of excited singly heavy mesons
by proposing a general Regge-like mass relations in which the slope ratio
$\alpha ^{\prime }/\beta ^{\prime }$ between the radial and angular-momentum
Regge trajectories is $\pi /2$ and the hadron mass undergoes a shift including
the heavy quark mass and an extra binding energy between heavy quark and
strange anti-quark. The relation is successfully tested against the observed
spin-averaged data of the singly heavy mesons in their radially and angularly
excited states. Some new predictions are made for more excited excitations and
the discussion is given associated with the QCD string (flux tube) picture.
|
[
{
"created": "Sat, 10 Nov 2018 08:16:46 GMT",
"version": "v1"
},
{
"created": "Sun, 7 Jul 2019 01:15:54 GMT",
"version": "v2"
}
] |
2019-07-09
|
[
[
"Jia",
"Duojie",
""
],
[
"Dong",
"Wen-Chao",
""
]
] |
In this work, we study the Regge-like spectra of excited singly heavy mesons by proposing a general Regge-like mass relations in which the slope ratio $\alpha ^{\prime }/\beta ^{\prime }$ between the radial and angular-momentum Regge trajectories is $\pi /2$ and the hadron mass undergoes a shift including the heavy quark mass and an extra binding energy between heavy quark and strange anti-quark. The relation is successfully tested against the observed spin-averaged data of the singly heavy mesons in their radially and angularly excited states. Some new predictions are made for more excited excitations and the discussion is given associated with the QCD string (flux tube) picture.
|
0710.4205
|
Andre Hoang
|
Sean Fleming, Andre H. Hoang, Sonny Mantry, Iain W. Stewart
|
Factorization Approach for Top Mass Reconstruction at High Energies
|
Talk given at 2007 International Linear Collider Workshop (LCWS07 and
ILC07), Hamburg, Germany, 30 May - 3 Jun 2007, 7 pages, 4 figures, title
modified
|
ECONF C0705302:LOOP06,2007
| null |
MPP-2007-151, MIT-CTP 3866
|
hep-ph
| null |
Using effective theories for jets and heavy quarks it is possible to prove
that the double differential top-antitop invariant mass distribution for the
process $e^+e^-\to t\bar t$ in the resonance region for c.m. energies $Q$ much
larger than the top mass can factorized into perturbatively computable hard
coefficients and jet functions and a non-perturbative soft function. For
invariant mass prescriptions based on hemispheres defined with respect to the
thrust axis the soft function can be extracted from massless jet event shape
distributions. This approach allows in principle for top mass determinations
without uncertainties from hadronization using the reconstruction method and to
quantify the top mass scheme dependence of the measured top quark mass value.
|
[
{
"created": "Tue, 23 Oct 2007 08:27:01 GMT",
"version": "v1"
}
] |
2009-02-16
|
[
[
"Fleming",
"Sean",
""
],
[
"Hoang",
"Andre H.",
""
],
[
"Mantry",
"Sonny",
""
],
[
"Stewart",
"Iain W.",
""
]
] |
Using effective theories for jets and heavy quarks it is possible to prove that the double differential top-antitop invariant mass distribution for the process $e^+e^-\to t\bar t$ in the resonance region for c.m. energies $Q$ much larger than the top mass can factorized into perturbatively computable hard coefficients and jet functions and a non-perturbative soft function. For invariant mass prescriptions based on hemispheres defined with respect to the thrust axis the soft function can be extracted from massless jet event shape distributions. This approach allows in principle for top mass determinations without uncertainties from hadronization using the reconstruction method and to quantify the top mass scheme dependence of the measured top quark mass value.
|
1410.6498
|
John D. Swain
|
A. Widom, J. Swain and Y. N. Srivastava
|
Concerning the Nature of the Cosmic Ray Power Law Exponents
| null | null | null | null |
hep-ph astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We have recently shown that the cosmic ray energy distributions as detected
on earthbound, low flying balloon or high flying satellite detectors can be
computed by employing the heats of evaporation of high energy particles from
astrophysical sources. In this manner, the experimentally well known power law
exponents of the cosmic ray energy distribution have been theoretically
computed as 2.701178 for the case of ideal Bose statistics, 3.000000 for the
case of ideal Boltzmann statistics and 3.151374 for the case of ideal Fermi
statistics. By "ideal" we mean virtually zero mass (i.e. ultra-relativistic)
and noninteracting. These results are in excellent agreement with the
experimental indices of 2.7 with a shift to 3.1 at the high energy ~ PeV "knee"
in the energy distribution. Our purpose here is to discuss the nature of cosmic
ray power law exponents obtained by employing conventional thermal quantum
field theoretical models such as quantum chromodynamics to the cosmic ray
sources in a thermodynamic scheme wherein gamma and zeta function regulation is
employed. The key reason for the surprising accuracy of the ideal boson and
ideal fermion cases resides in the asymptotic freedom or equivalently the
Feynman "parton" structure of the ultra-high energy tails of spectral
functions.
|
[
{
"created": "Wed, 15 Oct 2014 19:04:43 GMT",
"version": "v1"
},
{
"created": "Sat, 7 Feb 2015 23:50:39 GMT",
"version": "v2"
}
] |
2015-02-10
|
[
[
"Widom",
"A.",
""
],
[
"Swain",
"J.",
""
],
[
"Srivastava",
"Y. N.",
""
]
] |
We have recently shown that the cosmic ray energy distributions as detected on earthbound, low flying balloon or high flying satellite detectors can be computed by employing the heats of evaporation of high energy particles from astrophysical sources. In this manner, the experimentally well known power law exponents of the cosmic ray energy distribution have been theoretically computed as 2.701178 for the case of ideal Bose statistics, 3.000000 for the case of ideal Boltzmann statistics and 3.151374 for the case of ideal Fermi statistics. By "ideal" we mean virtually zero mass (i.e. ultra-relativistic) and noninteracting. These results are in excellent agreement with the experimental indices of 2.7 with a shift to 3.1 at the high energy ~ PeV "knee" in the energy distribution. Our purpose here is to discuss the nature of cosmic ray power law exponents obtained by employing conventional thermal quantum field theoretical models such as quantum chromodynamics to the cosmic ray sources in a thermodynamic scheme wherein gamma and zeta function regulation is employed. The key reason for the surprising accuracy of the ideal boson and ideal fermion cases resides in the asymptotic freedom or equivalently the Feynman "parton" structure of the ultra-high energy tails of spectral functions.
|
hep-ph/0511227
|
Bilenky Samoil
|
S. M. Bilenky
|
Majorana Neutrino Mixing
| null |
J.Phys. G32 (2006) R127
|
10.1088/0954-3899/32/5/R01
| null |
hep-ph
| null |
The most plausible see-saw explanation of the smallness of the neutrino
masses is based on the assumption that total lepton number is violated at a
large scale and neutrinos with definite masses are Majorana particles. In this
review we consider in details difference between Dirac and Majorana neutrino
mixing and possibilities of revealing Majorana nature of neutrinos with
definite masses.
|
[
{
"created": "Fri, 18 Nov 2005 14:14:48 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Feb 2006 10:00:07 GMT",
"version": "v2"
}
] |
2009-11-11
|
[
[
"Bilenky",
"S. M.",
""
]
] |
The most plausible see-saw explanation of the smallness of the neutrino masses is based on the assumption that total lepton number is violated at a large scale and neutrinos with definite masses are Majorana particles. In this review we consider in details difference between Dirac and Majorana neutrino mixing and possibilities of revealing Majorana nature of neutrinos with definite masses.
|
hep-ph/0005104
| null |
H. Athar (1), M. Jezabek (2), O. Yasuda (1) ((1) Tokyo Metropolitan
University, Japan, (2) Institute of Nuclear Physics, Poland)
|
Effects of neutrino mixing on high-energy cosmic neutrino flux
|
22 pages, Revtex, 5 figures included with epsfig, remarks added in
section II and section IV, some references updated, to appear in Phys. Rev. D
|
Phys.Rev.D62:103007,2000
|
10.1103/PhysRevD.62.103007
|
TMUP-HEL-0006
|
hep-ph astro-ph
| null |
Several cosmologically distant astrophysical sources may produce high-energy
cosmic neutrinos (E \geq 10^6 GeV) of all flavors above the atmospheric
neutrino background. We study the effects of vacuum neutrino mixing in three
flavor framework on this cosmic neutrino flux. We also consider the effects of
possible mixing between the three active neutrinos and the (fourth) sterile
neutrino with or without Big-Bang nucleosynthesis constraints and estimate the
resulting final high-energy cosmic neutrino flux ratios on earth compatible
with currently existing different neutrino oscillation hints in a model
independent way. Further, we discuss the case where the intrinsic cosmic
neutrino flux does not have the standard ratio.
|
[
{
"created": "Thu, 11 May 2000 06:30:16 GMT",
"version": "v1"
},
{
"created": "Fri, 18 Aug 2000 08:47:55 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Athar",
"H.",
""
],
[
"Jezabek",
"M.",
""
],
[
"Yasuda",
"O.",
""
]
] |
Several cosmologically distant astrophysical sources may produce high-energy cosmic neutrinos (E \geq 10^6 GeV) of all flavors above the atmospheric neutrino background. We study the effects of vacuum neutrino mixing in three flavor framework on this cosmic neutrino flux. We also consider the effects of possible mixing between the three active neutrinos and the (fourth) sterile neutrino with or without Big-Bang nucleosynthesis constraints and estimate the resulting final high-energy cosmic neutrino flux ratios on earth compatible with currently existing different neutrino oscillation hints in a model independent way. Further, we discuss the case where the intrinsic cosmic neutrino flux does not have the standard ratio.
|
1603.01638
|
Matthias Schlaffer
|
Matthias Schlaffer, Michael Spannowsky, Andreas Weiler
|
Searching for supersymmetry scalelessly
|
25 pages, 12 figures. v2: Minor changes, references added. Version
accepted by EPJC
| null |
10.1140/epjc/s10052-016-4299-y
|
DESY 15-252, IPPP/15/77, DCPT/15/154
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper we propose a scale invariant search strategy for hadronic top
or bottom plus missing energy final states. We present a method which shows
flat efficiencies and background rejection factors over broad ranges of
parameters and masses. The resulting search can be easily recast into a limit
on alternative models. We show the strength of the method in a natural SUSY
setup where stop and sbottom squarks are pair produced and decay into
hadronically decaying top quarks or bottom quarks and higgsinos.
|
[
{
"created": "Fri, 4 Mar 2016 21:36:43 GMT",
"version": "v1"
},
{
"created": "Sun, 25 Sep 2016 13:39:31 GMT",
"version": "v2"
}
] |
2016-09-27
|
[
[
"Schlaffer",
"Matthias",
""
],
[
"Spannowsky",
"Michael",
""
],
[
"Weiler",
"Andreas",
""
]
] |
In this paper we propose a scale invariant search strategy for hadronic top or bottom plus missing energy final states. We present a method which shows flat efficiencies and background rejection factors over broad ranges of parameters and masses. The resulting search can be easily recast into a limit on alternative models. We show the strength of the method in a natural SUSY setup where stop and sbottom squarks are pair produced and decay into hadronically decaying top quarks or bottom quarks and higgsinos.
|
hep-ph/0405094
|
Thomas G. Rizzo
|
Thomas G. Rizzo
|
Phenomenology of Higgsless Electroweak Symmetry Breaking
|
6 pages, 4 figures; talk given at the International Linear Collider
Workshop, Paris, France, April 2004
| null | null |
SLAC-PUB-10431
|
hep-ph
| null |
It is possible to construct models based on warped extra dimensions in which
electroweak symmetry breaking takes place without the introduction of any Higgs
fields. This breaking can occur through the judiciuous choice of boundary
conditions applied to gauge fields living in the bulk. One then finds that the
fifth components of these bulk fields act as the Goldstone bosons, even for the
would-be zero modes of the Kaluza-Klein tower. In this talk I will discuss the
phenomenology of such scenarios, in particular, the problems associated with
the construction of realistic models due to the simultaneous constraints
imposed by precision electroweak data, present collider search limits and the
requirement of perturabtive unitarity in $W_L^+W_L^-$ elastic scattering.
Future collider signatures for such scenarios are also discussed.
|
[
{
"created": "Tue, 11 May 2004 18:11:22 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Rizzo",
"Thomas G.",
""
]
] |
It is possible to construct models based on warped extra dimensions in which electroweak symmetry breaking takes place without the introduction of any Higgs fields. This breaking can occur through the judiciuous choice of boundary conditions applied to gauge fields living in the bulk. One then finds that the fifth components of these bulk fields act as the Goldstone bosons, even for the would-be zero modes of the Kaluza-Klein tower. In this talk I will discuss the phenomenology of such scenarios, in particular, the problems associated with the construction of realistic models due to the simultaneous constraints imposed by precision electroweak data, present collider search limits and the requirement of perturabtive unitarity in $W_L^+W_L^-$ elastic scattering. Future collider signatures for such scenarios are also discussed.
|
hep-ph/0406072
|
Jun'ichi Yokoyama
|
Jun'ichi Yokoyama
|
Fate of oscillating scalar fields in the thermal bath and their
cosmological implications
|
47 pages, 1 figure
|
Phys.Rev. D70 (2004) 103511
|
10.1103/PhysRevD.70.103511
|
OU-TAP-232
|
hep-ph
| null |
Relaxation process of a coherent scalar field oscillation in the thermal bath
is investigated using nonequilibrium quantum field theory. The Langevin-type
equation of motion is obtained which has a memory term and both additive and
multiplicative noise terms. The dissipation rate of the oscillating scalar
field is calculated for various interactions such as Yukawa coupling,
three-body scalar interaction, and biquadratic interaction. When the background
temperature is larger than the oscillation frequency, the dissipation rate
arising from the interactions with fermions is suppressed due to the Pauli
blocking, while it is enhanced for interactions with bosons due to the induced
effect. In both cases, we find that the microphysical detailed balance relation
drives the oscillating field to a thermal equilibrium state. That is, for
low-momentum modes, the classical fluctuation-dissipation theorem holds and
they relax to a state the equipartition law is satisfied, while higher-momentum
modes reach the state the number density of each quanta consists of the thermal
boson distribution function and zero-point vacuum contribution. The
temperature-dependent dissipation rates obtained here are applied to the late
reheating phase of inflationary universe. It is found that in some cases the
reheat temperature may take somewhat different value from the conventional
estimates, and in an extreme case the inflaton can dissipate its energy without
linear interactions that leads to its decay. Furthermore the evaporation rate
of the Affleck-Dine field at the onset of its oscillation is calculated.
|
[
{
"created": "Mon, 7 Jun 2004 06:14:14 GMT",
"version": "v1"
}
] |
2009-11-10
|
[
[
"Yokoyama",
"Jun'ichi",
""
]
] |
Relaxation process of a coherent scalar field oscillation in the thermal bath is investigated using nonequilibrium quantum field theory. The Langevin-type equation of motion is obtained which has a memory term and both additive and multiplicative noise terms. The dissipation rate of the oscillating scalar field is calculated for various interactions such as Yukawa coupling, three-body scalar interaction, and biquadratic interaction. When the background temperature is larger than the oscillation frequency, the dissipation rate arising from the interactions with fermions is suppressed due to the Pauli blocking, while it is enhanced for interactions with bosons due to the induced effect. In both cases, we find that the microphysical detailed balance relation drives the oscillating field to a thermal equilibrium state. That is, for low-momentum modes, the classical fluctuation-dissipation theorem holds and they relax to a state the equipartition law is satisfied, while higher-momentum modes reach the state the number density of each quanta consists of the thermal boson distribution function and zero-point vacuum contribution. The temperature-dependent dissipation rates obtained here are applied to the late reheating phase of inflationary universe. It is found that in some cases the reheat temperature may take somewhat different value from the conventional estimates, and in an extreme case the inflaton can dissipate its energy without linear interactions that leads to its decay. Furthermore the evaporation rate of the Affleck-Dine field at the onset of its oscillation is calculated.
|
hep-ph/0609222
|
Yuli Shabelski
|
M. G. Ryskin and Yu. M. Shabelski
|
Tetraquarks and Pentaquarks in String Models
|
7 pages, 2 figures
|
Eur.Phys.J.C50:81-83,2007
|
10.1140/epjc/s10052-006-0207-1
| null |
hep-ph
| null |
We consider the production and decay of multiquark systems in the framework
of string models where the hadron structure is determined by valence quarks
together with string junctions. We show that the low mass multiquark resonances
can be very narrow.
|
[
{
"created": "Thu, 21 Sep 2006 10:42:04 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Ryskin",
"M. G.",
""
],
[
"Shabelski",
"Yu. M.",
""
]
] |
We consider the production and decay of multiquark systems in the framework of string models where the hadron structure is determined by valence quarks together with string junctions. We show that the low mass multiquark resonances can be very narrow.
|
hep-ph/9706215
|
Michael Sotiropoulos
|
K.D. Anderson, D.A. Ross (U. Southampton) and M.G. Sotiropoulos (U.
Michigan)
|
Borel singularities at small x
|
5 pages, Latex (Talk presented at DIS'97, Chicago, IL)
| null |
10.1063/1.53698
|
SHEP 97-10, UM-TH-97-13
|
hep-ph
| null |
D.I.S. at small Bjorken $x$ is considered within the dipole cascade
formalism. The running coupling in impact parameter space is introduced in
order to parametrize effects that arise from emission of large size dipoles.
This results in a new evolution equation for the dipole cascade. Strong
coupling effects are analyzed after transforming the evolution equation in
Borel ($b$) space. The Borel singularities of the solution are discussed first
for the universal part of the dipole cascade and then for the specific process
of D.I.S. at small $x$. In the latter case the leading infrared renormalon is
at $b=1/\beta_0$ indicating the presence of $1/Q^2$ power corrections for the
small-$x$ structure functions.
|
[
{
"created": "Mon, 2 Jun 1997 16:43:59 GMT",
"version": "v1"
}
] |
2009-10-30
|
[
[
"Anderson",
"K. D.",
"",
"U. Southampton"
],
[
"Ross",
"D. A.",
"",
"U. Southampton"
],
[
"Sotiropoulos",
"M. G.",
"",
"U.\n Michigan"
]
] |
D.I.S. at small Bjorken $x$ is considered within the dipole cascade formalism. The running coupling in impact parameter space is introduced in order to parametrize effects that arise from emission of large size dipoles. This results in a new evolution equation for the dipole cascade. Strong coupling effects are analyzed after transforming the evolution equation in Borel ($b$) space. The Borel singularities of the solution are discussed first for the universal part of the dipole cascade and then for the specific process of D.I.S. at small $x$. In the latter case the leading infrared renormalon is at $b=1/\beta_0$ indicating the presence of $1/Q^2$ power corrections for the small-$x$ structure functions.
|
hep-ph/0606253
|
Edmond Iancu
|
J.-P. Blaizot, E. Iancu and D.N. Triantafyllopoulos
|
A zero-dimensional model for high-energy scattering in QCD
|
34 pages, 9 figures. Some explanations added on the frame-dependence
of the relevant configurations (new section 3.3)
|
Nucl.Phys.A784:227-258,2007
|
10.1016/j.nuclphysa.2006.11.127
|
ECT*-06-09, SACLAY-T06/067
|
hep-ph
| null |
We investigate a zero-dimensional toy model originally introduced by Mueller
and Salam which mimics high-energy scattering in QCD in the presence of both
gluon saturation and gluon number fluctuations, and hence of Pomeron loops.
Unlike other toy models of the reaction-diffusion type, the model studied in
this paper is consistent with boost invariance and, related to that, it
exhibits a mechanism for particle saturation close to that of the JIMWLK
equation in QCD, namely the saturation of the emission rate due to high-density
effects. Within this model, we establish the dominant high-energy behaviour of
the S-matrix element <S^n> for the scattering between a target obtained by
evolving one particle and a projectile made with exactly n particles.
Remarkably, we find that all such matrix elements approach the black disk limit
S=0 at high rapidity Y, with the same exponential law: <S^n> ~ exp(-Y) for all
values of n. This is so because the S-matrix is dominated by rare target
configurations which involve only few particles. We also find that the bulk
distribution for a saturated system is of the Poisson type.
|
[
{
"created": "Fri, 23 Jun 2006 17:51:37 GMT",
"version": "v1"
},
{
"created": "Sat, 24 Jun 2006 15:13:17 GMT",
"version": "v2"
},
{
"created": "Wed, 2 Aug 2006 07:59:07 GMT",
"version": "v3"
}
] |
2008-11-26
|
[
[
"Blaizot",
"J. -P.",
""
],
[
"Iancu",
"E.",
""
],
[
"Triantafyllopoulos",
"D. N.",
""
]
] |
We investigate a zero-dimensional toy model originally introduced by Mueller and Salam which mimics high-energy scattering in QCD in the presence of both gluon saturation and gluon number fluctuations, and hence of Pomeron loops. Unlike other toy models of the reaction-diffusion type, the model studied in this paper is consistent with boost invariance and, related to that, it exhibits a mechanism for particle saturation close to that of the JIMWLK equation in QCD, namely the saturation of the emission rate due to high-density effects. Within this model, we establish the dominant high-energy behaviour of the S-matrix element <S^n> for the scattering between a target obtained by evolving one particle and a projectile made with exactly n particles. Remarkably, we find that all such matrix elements approach the black disk limit S=0 at high rapidity Y, with the same exponential law: <S^n> ~ exp(-Y) for all values of n. This is so because the S-matrix is dominated by rare target configurations which involve only few particles. We also find that the bulk distribution for a saturated system is of the Poisson type.
|
1412.0813
|
Frigyes Nemes Mr.
|
F. Nemes, T. Cs\"org\H{o}, M. Csan\'ad
|
Excitation function of elastic $pp$ scattering from a unitarily extended
Bialas-Bzdak model
|
Talk by T. Csorgo presented at the WPCF 2014 conference, Gyongyos,
Hungary, August 25-29 2014
| null |
10.1142/S0217751X15500761
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The Bialas-Bzdak model of elastic proton-proton scattering assumes a purely
imaginary forward scattering amplitude, which consequently vanishes at the
diffractive minima. We extended the model to arbitrarily large real parts in a
way that constraints from unitarity are satisfied. The resulting model is able
to describe elastic $pp$ scattering not only at the lower ISR energies but also
at $\sqrt{s}=$7 TeV in a statistically acceptable manner, both in the
diffractive cone and in the region of the first diffractive minimum. The total
cross-section as well as the differential cross-section of elastic
proton-proton scattering is predicted for the future LHC energies of
$\sqrt{s}=$8, 13, 14, 15 TeV and also to 28 TeV. A non-trivial, significantly
non-exponential feature of the differential cross-section of elastic
proton-proton scattering is analyzed and the excitation function of the
non-exponential behavior is predicted. The excitation function of the shadow
profiles is discussed and related to saturation at small impact parameters.
|
[
{
"created": "Tue, 2 Dec 2014 08:52:52 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Mar 2015 14:18:11 GMT",
"version": "v2"
},
{
"created": "Tue, 7 Apr 2015 13:15:10 GMT",
"version": "v3"
}
] |
2015-06-11
|
[
[
"Nemes",
"F.",
""
],
[
"Csörgő",
"T.",
""
],
[
"Csanád",
"M.",
""
]
] |
The Bialas-Bzdak model of elastic proton-proton scattering assumes a purely imaginary forward scattering amplitude, which consequently vanishes at the diffractive minima. We extended the model to arbitrarily large real parts in a way that constraints from unitarity are satisfied. The resulting model is able to describe elastic $pp$ scattering not only at the lower ISR energies but also at $\sqrt{s}=$7 TeV in a statistically acceptable manner, both in the diffractive cone and in the region of the first diffractive minimum. The total cross-section as well as the differential cross-section of elastic proton-proton scattering is predicted for the future LHC energies of $\sqrt{s}=$8, 13, 14, 15 TeV and also to 28 TeV. A non-trivial, significantly non-exponential feature of the differential cross-section of elastic proton-proton scattering is analyzed and the excitation function of the non-exponential behavior is predicted. The excitation function of the shadow profiles is discussed and related to saturation at small impact parameters.
|
1107.3814
|
Wolfgang Altmannshofer
|
Wolfgang Altmannshofer, Marcela Carena, Stefania Gori and Alejandro de
la Puente
|
Signals of CP Violation Beyond the MSSM in Higgs and Flavor Physics
|
58 pages, 15 figures, 2 tables, v2 matches published version
| null |
10.1103/PhysRevD.84.095027
|
FERMILAB-PUB-11-330-T
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study an extension of the Higgs sector of the Minimal Supersymmetric
Standard Model (MSSM), considering the effects of new degrees of freedom at the
TeV scale, and allowing for sources of CP violation beyond the MSSM (BMSSM). We
analyze the impact of the BMSSM sources of CP violation on the Higgs collider
phenomenology and on low energy flavor and CP violating observables. We
identify distinct Higgs collider signatures that cannot be realized, either in
the case without CP violating phases or in the CP violating MSSM, and
investigate the prospects to probe them at the Tevatron and the LHC. The most
striking benchmark scenario has three neutral Higgs bosons that all decay
dominantly into W boson pairs and that are well within the reach of the 7 TeV
LHC run. On the other hand, we also present scenarios with three Higgs bosons
that have masses M_Hi > 150 GeV and decay dominantly into b bbar. Such
scenarios are much more challenging to probe and can even lie completely
outside the reach of the 7 TeV LHC run. We explore complementary scenarios with
standard MSSM Higgs signals that allow to accommodate a sizable B_s mixing
phase as indicated by D0, as well as the excess in B_s --> mu+ mu- candidates
recently reported by CDF. We find that, in contrast to the MSSM, a minimal
flavor violating soft sector is sufficient to generate significant corrections
to CP violating observables in meson mixing, compatible with EDM constraints.
In particular, a sizable B_s mixing phase, S_psiphi < 0.4, can be achieved for
specific regions of parameter space. Such a large B_s mixing phase would
unambiguously imply a sizable suppression of S_psiKs with respect to the SM
prediction and a BR(B_s --> mu+ mu-) close to the 95% C.L. upper bound reported
by CDF.
|
[
{
"created": "Tue, 19 Jul 2011 19:29:12 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Nov 2011 17:57:49 GMT",
"version": "v2"
}
] |
2011-11-22
|
[
[
"Altmannshofer",
"Wolfgang",
""
],
[
"Carena",
"Marcela",
""
],
[
"Gori",
"Stefania",
""
],
[
"de la Puente",
"Alejandro",
""
]
] |
We study an extension of the Higgs sector of the Minimal Supersymmetric Standard Model (MSSM), considering the effects of new degrees of freedom at the TeV scale, and allowing for sources of CP violation beyond the MSSM (BMSSM). We analyze the impact of the BMSSM sources of CP violation on the Higgs collider phenomenology and on low energy flavor and CP violating observables. We identify distinct Higgs collider signatures that cannot be realized, either in the case without CP violating phases or in the CP violating MSSM, and investigate the prospects to probe them at the Tevatron and the LHC. The most striking benchmark scenario has three neutral Higgs bosons that all decay dominantly into W boson pairs and that are well within the reach of the 7 TeV LHC run. On the other hand, we also present scenarios with three Higgs bosons that have masses M_Hi > 150 GeV and decay dominantly into b bbar. Such scenarios are much more challenging to probe and can even lie completely outside the reach of the 7 TeV LHC run. We explore complementary scenarios with standard MSSM Higgs signals that allow to accommodate a sizable B_s mixing phase as indicated by D0, as well as the excess in B_s --> mu+ mu- candidates recently reported by CDF. We find that, in contrast to the MSSM, a minimal flavor violating soft sector is sufficient to generate significant corrections to CP violating observables in meson mixing, compatible with EDM constraints. In particular, a sizable B_s mixing phase, S_psiphi < 0.4, can be achieved for specific regions of parameter space. Such a large B_s mixing phase would unambiguously imply a sizable suppression of S_psiKs with respect to the SM prediction and a BR(B_s --> mu+ mu-) close to the 95% C.L. upper bound reported by CDF.
|
1302.4653
|
Anton Ilderton
|
A. Gonoskov, I. Gonoskov, C. Harvey, A. Ilderton, A. Kim, M. Marklund,
G. Mourou, A.M. Sergeev
|
Probing nonperturbative QED with optimally focused laser pulses
|
5 pages, 2 pdf figures. Version 2: extended discussion of cascades,
references updated. To appear in PRL
| null |
10.1103/PhysRevLett.111.060404
| null |
hep-ph physics.plasm-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study nonperturbative pair production in intense, focused laser fields
called e-dipole pulses. We address the conditions required, such as the quality
of the vacuum, for reaching high intensities without initiating beam-depleting
cascades, the number of pairs which can be created, and experimental detection
of the created pairs. We find that e-dipole pulses offer an optimal method of
investigating nonperturbative QED.
|
[
{
"created": "Tue, 19 Feb 2013 15:58:40 GMT",
"version": "v1"
},
{
"created": "Fri, 26 Jul 2013 12:40:57 GMT",
"version": "v2"
}
] |
2013-08-14
|
[
[
"Gonoskov",
"A.",
""
],
[
"Gonoskov",
"I.",
""
],
[
"Harvey",
"C.",
""
],
[
"Ilderton",
"A.",
""
],
[
"Kim",
"A.",
""
],
[
"Marklund",
"M.",
""
],
[
"Mourou",
"G.",
""
],
[
"Sergeev",
"A. M.",
""
]
] |
We study nonperturbative pair production in intense, focused laser fields called e-dipole pulses. We address the conditions required, such as the quality of the vacuum, for reaching high intensities without initiating beam-depleting cascades, the number of pairs which can be created, and experimental detection of the created pairs. We find that e-dipole pulses offer an optimal method of investigating nonperturbative QED.
|
1505.06593
|
Liliana Apolin\'ario
|
Liliana Apolin\'ario, N\'estor Armesto, Guilherme Milhano, Carlos A.
Salgado
|
Towards a consistent description of in-medium parton branching
|
Proceedings Exited QCD 2015 (6 pages)
| null | null | null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Ultra-relativistic heavy-ion collisions are a window of opportunity to study
QCD matter under extreme conditions of temperature and density, such as the
quark-gluon plasma. Among the several possibilities, the study of jet quenching
- generic name given to in-medium energy loss modifications of the parton
branching - is a powerful tool to assess the properties of this new state of
matter. The description of the parton shower is very well understood in vacuum
(controlled reference) and medium-induced modifications of this process can be
experimentally accessed through jet measurements. Current experimental data,
however, cannot be entirely described only with energy loss phenomena.
Transverse momentum broadening and decoherence effects, both theoretically
established by now, and their interplay are essential to build a consistent
picture of the medium-modifications of the parton branching and to achieve a
correct description of the current experimental data. In this write-up, we will
present the latest developments that address such unified description.
|
[
{
"created": "Mon, 25 May 2015 10:54:07 GMT",
"version": "v1"
}
] |
2015-05-26
|
[
[
"Apolinário",
"Liliana",
""
],
[
"Armesto",
"Néstor",
""
],
[
"Milhano",
"Guilherme",
""
],
[
"Salgado",
"Carlos A.",
""
]
] |
Ultra-relativistic heavy-ion collisions are a window of opportunity to study QCD matter under extreme conditions of temperature and density, such as the quark-gluon plasma. Among the several possibilities, the study of jet quenching - generic name given to in-medium energy loss modifications of the parton branching - is a powerful tool to assess the properties of this new state of matter. The description of the parton shower is very well understood in vacuum (controlled reference) and medium-induced modifications of this process can be experimentally accessed through jet measurements. Current experimental data, however, cannot be entirely described only with energy loss phenomena. Transverse momentum broadening and decoherence effects, both theoretically established by now, and their interplay are essential to build a consistent picture of the medium-modifications of the parton branching and to achieve a correct description of the current experimental data. In this write-up, we will present the latest developments that address such unified description.
|
hep-ph/0402293
|
Bugra Borasoy
|
B.Borasoy, E.Marco, S.Wetzel
|
eta, eta-prime photoproduction and electroproduction off protons
|
Presented at the Hirschegg 2004 conference, Jan. 11-17
| null | null | null |
hep-ph nucl-th
| null |
Photo- and electroproduction of eta, eta-prime mesons on protons are
investigated within a relativistic chiral unitary approach based on coupled
channels. The s wave potentials for electroproduction and meson-baryon
scattering are derived from a chiral effective Lagrangian which includes the
eta-prime as an explicit degree of freedom and incorporates important features
of the underlying QCD Lagrangian such as the axial U(1) anomaly. The effective
potentials are iterated in a Bethe-Salpeter equation and cross sections for
eta, eta-prime photo- and electroproduction from protons are obtained. The
results for the eta-prime photoproduction cross section reproduce the
appearance of an S_(11) resonance around 1.9 GeV observed at ELSA. The
inclusion of electromagnetic form factors increases the predicted eta
electroproduction cross sections, providing a qualitative explanation for the
hard form factor of the photocoupling amplitude observed at CLAS.
|
[
{
"created": "Fri, 27 Feb 2004 13:52:34 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Borasoy",
"B.",
""
],
[
"Marco",
"E.",
""
],
[
"Wetzel",
"S.",
""
]
] |
Photo- and electroproduction of eta, eta-prime mesons on protons are investigated within a relativistic chiral unitary approach based on coupled channels. The s wave potentials for electroproduction and meson-baryon scattering are derived from a chiral effective Lagrangian which includes the eta-prime as an explicit degree of freedom and incorporates important features of the underlying QCD Lagrangian such as the axial U(1) anomaly. The effective potentials are iterated in a Bethe-Salpeter equation and cross sections for eta, eta-prime photo- and electroproduction from protons are obtained. The results for the eta-prime photoproduction cross section reproduce the appearance of an S_(11) resonance around 1.9 GeV observed at ELSA. The inclusion of electromagnetic form factors increases the predicted eta electroproduction cross sections, providing a qualitative explanation for the hard form factor of the photocoupling amplitude observed at CLAS.
|
hep-ph/9309225
|
Jose
|
J. C. D'Olivo and Jose F. Nieves
|
Damping Rate of a Fermion in a Medium
|
Version to appear in Phys. Rev. D
|
Phys.Rev.D52:2987-2993,1995
|
10.1103/PhysRevD.52.2987
| null |
hep-ph
| null |
We examine the relation between the damping rate of a massless, chiral
fermion that propagates in a medium, and the rate $\Gamma$ of approach to
equilibrium. It is proven that these quantities are equal, by showing that they
are given by the same formula in terms of the imaginary part of the self-energy
evaluated at the energy of the propagating fermion mode. This result is valid
provided $\Gamma$ is defined by using the appropriate wave functions of the
mode.
|
[
{
"created": "Fri, 3 Sep 1993 23:00:00 GMT",
"version": "v1"
},
{
"created": "Fri, 19 May 1995 14:02:00 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"D'Olivo",
"J. C.",
""
],
[
"Nieves",
"Jose F.",
""
]
] |
We examine the relation between the damping rate of a massless, chiral fermion that propagates in a medium, and the rate $\Gamma$ of approach to equilibrium. It is proven that these quantities are equal, by showing that they are given by the same formula in terms of the imaginary part of the self-energy evaluated at the energy of the propagating fermion mode. This result is valid provided $\Gamma$ is defined by using the appropriate wave functions of the mode.
|
hep-ph/0505196
|
Alexander E. Dorokhov
|
A.E. Dorokhov
|
Singlet VA \tilde V correlator within the instanton vacuum model
|
9 pages, 4 figures
|
JETP Lett. 82 (2005) 1-6; Pisma Zh.Eksp.Teor.Fiz. 82 (2005) 3-7
|
10.1134/1.2045328
| null |
hep-ph
| null |
The correlator of singlet axial-vector and vector currents in the external
electromagnetic field is studied within the instanton liquid model of QCD
vacuum. In the chiral limit we calculate the longitudinal w_L^0 and transversal
w_T^0 with respect to axial-vector index invariant amplitudes at arbitrary
momentum transfer q. It is demonstrated how the anomalous longitudinal part of
the correlator is renormalized at low momenta due to the presence of the U_A(1)
anomaly.
|
[
{
"created": "Mon, 23 May 2005 14:44:20 GMT",
"version": "v1"
}
] |
2009-11-11
|
[
[
"Dorokhov",
"A. E.",
""
]
] |
The correlator of singlet axial-vector and vector currents in the external electromagnetic field is studied within the instanton liquid model of QCD vacuum. In the chiral limit we calculate the longitudinal w_L^0 and transversal w_T^0 with respect to axial-vector index invariant amplitudes at arbitrary momentum transfer q. It is demonstrated how the anomalous longitudinal part of the correlator is renormalized at low momenta due to the presence of the U_A(1) anomaly.
|
1011.3403
|
Michal Praszalowicz
|
Larry McLerran and Michal Praszalowicz
|
Saturation and Scaling of Multiplicity, Mean p_T and p_T Distributions
from 200 GeV < sqrt{s} < 7 TeV - Addendum
|
5 pages, 3 figures, addendum to the paper arXiv:1006.4293 [hep-ph]
published in Acta Phys. Polon. B41:1917-1926, 2010. In v2 plots with UA1 data
added, in v3 a typo in eq.(2) corrected
|
Acta Phys.Polon.B42:99-103,2011
|
10.5506/APhysPolB.42.99
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In the previous paper we have argued that the LHC data on multiplicity,
average transverse momentum, and charged particle transverse momentum
distributions are well described with minimal modeling in terms of a saturation
scale Q_sat(s). As a consequence, the p_T spectra should exhibit geometric
scaling. In this short note we show that recently released CMS data at
sqrt{s}=0.9, 2.36 and 7 TeV fall on a universal curve when plotted in terms of
suitably defined scaling variable \tau.
|
[
{
"created": "Mon, 15 Nov 2010 14:34:00 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Nov 2010 14:54:38 GMT",
"version": "v2"
},
{
"created": "Thu, 9 Dec 2010 07:15:22 GMT",
"version": "v3"
}
] |
2011-06-28
|
[
[
"McLerran",
"Larry",
""
],
[
"Praszalowicz",
"Michal",
""
]
] |
In the previous paper we have argued that the LHC data on multiplicity, average transverse momentum, and charged particle transverse momentum distributions are well described with minimal modeling in terms of a saturation scale Q_sat(s). As a consequence, the p_T spectra should exhibit geometric scaling. In this short note we show that recently released CMS data at sqrt{s}=0.9, 2.36 and 7 TeV fall on a universal curve when plotted in terms of suitably defined scaling variable \tau.
|
hep-ph/0106334
|
Leszek Roszkowski
|
Leszek Roszkowski, Roberto Ruiz de Austri and Takeshi Nihei
|
New Cosmological and Experimental Constraints on the CMSSM
|
LaTex, 21 pages, 4 PS figures. Version published in JHEP, for updates
see hep-ph/0206178
|
JHEP0108:024,2001
|
10.1088/1126-6708/2001/08/024
| null |
hep-ph
| null |
We analyze the implications of several recent cosmological and experimental
measurements for the mass spectra of the Constrained MSSM (CMSSM). We compute
the relic abundance of the neutralino and compare the new cosmologically
expected and excluded mass ranges with those ruled out by the final LEP bounds
on the lightest chargino and Higgs masses, with those excluded by current
experimental values of $\br(B\to X_s \gamma)$, and with those favored by the
recent measurement of the anomalous magnetic moment of the muon. We find that
for $tan\beta\lsim 45$ there remains relatively little room for the mass
spectra to be consistent with the interplay of the several constraints. On the
other hand, at larger values of $tan\beta\$ the decreasing mass of the
pseudoscalar Higgs gives rise to a wide resonance in the neutralino WIMP
pair-annihilation, whose position depends on the ratio of top and bottom quark
masses. As a consequence, the cosmologically expected regions consistent with
other constraints often grow significantly and generally shift towards
superpartner masses in the $\tev$ range.
|
[
{
"created": "Thu, 28 Jun 2001 22:24:15 GMT",
"version": "v1"
},
{
"created": "Sun, 30 Jun 2002 22:04:19 GMT",
"version": "v2"
}
] |
2009-11-07
|
[
[
"Roszkowski",
"Leszek",
""
],
[
"de Austri",
"Roberto Ruiz",
""
],
[
"Nihei",
"Takeshi",
""
]
] |
We analyze the implications of several recent cosmological and experimental measurements for the mass spectra of the Constrained MSSM (CMSSM). We compute the relic abundance of the neutralino and compare the new cosmologically expected and excluded mass ranges with those ruled out by the final LEP bounds on the lightest chargino and Higgs masses, with those excluded by current experimental values of $\br(B\to X_s \gamma)$, and with those favored by the recent measurement of the anomalous magnetic moment of the muon. We find that for $tan\beta\lsim 45$ there remains relatively little room for the mass spectra to be consistent with the interplay of the several constraints. On the other hand, at larger values of $tan\beta\$ the decreasing mass of the pseudoscalar Higgs gives rise to a wide resonance in the neutralino WIMP pair-annihilation, whose position depends on the ratio of top and bottom quark masses. As a consequence, the cosmologically expected regions consistent with other constraints often grow significantly and generally shift towards superpartner masses in the $\tev$ range.
|
1104.0889
|
Rikard Enberg
|
Rikard Enberg, Roman Pasechnik
|
Associated central exclusive production of charged Higgs bosons
|
9 pages, 5 figures. Minor changes, references added. Version to
appear in PRD
|
Phys.Rev.D83:095020,2011
|
10.1103/PhysRevD.83.095020
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We propose central exclusive production of a charged Higgs boson in
association with a W boson as a possible signature of certain types of extended
Higgs sectors. We calculate the cross section and find that the rate at the LHC
could be large enough to allow observation in some models with two Higgs
doublets, where the charged Higgs and at least one of the neutral scalars can
be light enough. We use the two-Higgs doublet model as a prototype and consider
two distinct regions of parameter space, but we also briefly discuss the
prospects for the next-to-minimal supersymmetric standard model, where the
charged Higgs may very well be quite light.
|
[
{
"created": "Tue, 5 Apr 2011 16:52:35 GMT",
"version": "v1"
},
{
"created": "Fri, 20 May 2011 16:57:48 GMT",
"version": "v2"
}
] |
2015-03-19
|
[
[
"Enberg",
"Rikard",
""
],
[
"Pasechnik",
"Roman",
""
]
] |
We propose central exclusive production of a charged Higgs boson in association with a W boson as a possible signature of certain types of extended Higgs sectors. We calculate the cross section and find that the rate at the LHC could be large enough to allow observation in some models with two Higgs doublets, where the charged Higgs and at least one of the neutral scalars can be light enough. We use the two-Higgs doublet model as a prototype and consider two distinct regions of parameter space, but we also briefly discuss the prospects for the next-to-minimal supersymmetric standard model, where the charged Higgs may very well be quite light.
|
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