id
stringlengths 9
14
| submitter
stringlengths 1
56
⌀ | authors
stringlengths 5
7.68k
| title
stringlengths 3
299
| comments
stringlengths 1
1.15k
⌀ | journal-ref
stringlengths 9
298
⌀ | doi
stringlengths 12
97
⌀ | report-no
stringlengths 3
341
⌀ | categories
stringclasses 869
values | license
stringclasses 9
values | orig_abstract
stringlengths 16
2.44k
| versions
listlengths 1
39
| update_date
stringlengths 10
10
| authors_parsed
listlengths 1
565
| abstract
stringlengths 13
2.44k
|
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
hep-ph/9612420
| null |
T. E. O. Ericson and B. Loiseau
|
Systematic effects in the determination of the piNN Coupling from pbar p
-> nbar n differential cross section
|
14 pages, LaTeX, 4 encapsulated Postscript figures (uses epsf.tex),
to be published in Phys. lett. B
|
Phys.Lett.B393:167-174,1997
|
10.1016/S0370-2693(96)01601-2
|
TSL/ISV-96-057 and IPNO/TH 96-43
|
hep-ph nucl-th
| null |
We show that the $\pi NN$ coupling constant extracted model-independently
from $\bar pp$ charge exchange is subject to a systematic correction, and, more
importantly, that the strong absorption in the critical region prevents a
determination of the coupling constant to high precision using this process.
This attenuates the possible conflict with the value determined from the np
charge exchange cross sections.
|
[
{
"created": "Thu, 19 Dec 1996 18:53:24 GMT",
"version": "v1"
},
{
"created": "Fri, 20 Dec 1996 12:15:54 GMT",
"version": "v2"
}
] |
2009-02-11
|
[
[
"Ericson",
"T. E. O.",
""
],
[
"Loiseau",
"B.",
""
]
] |
We show that the $\pi NN$ coupling constant extracted model-independently from $\bar pp$ charge exchange is subject to a systematic correction, and, more importantly, that the strong absorption in the critical region prevents a determination of the coupling constant to high precision using this process. This attenuates the possible conflict with the value determined from the np charge exchange cross sections.
|
1012.1053
|
Chiu Man Ho
|
Chiu Man Ho
|
Leptogenesis and CPT Violation
|
5 pages, v3: version to appear in PLB with improved discussions
|
Phys.Lett.B702:398-401,2011
|
10.1016/j.physletb.2011.07.035
| null |
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We construct a model in which neutrinos and anti-neutrinos acquire the same
mass but slightly different energy dispersion relations.Despite CPT violation,
spin-statistics is preserved. We find that leptogenesis can be easily explained
within this model, without upsetting the solar, atmospheric and reactor
neutrino data. Leptogenesis occurs without lepton number violation and the
non-equilibrium condition. We consider only three active Dirac neutrinos, and
no new particles or symmetries are introduced.
|
[
{
"created": "Sun, 5 Dec 2010 23:34:36 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Dec 2010 20:51:21 GMT",
"version": "v2"
},
{
"created": "Wed, 13 Jul 2011 01:43:05 GMT",
"version": "v3"
}
] |
2011-09-28
|
[
[
"Ho",
"Chiu Man",
""
]
] |
We construct a model in which neutrinos and anti-neutrinos acquire the same mass but slightly different energy dispersion relations.Despite CPT violation, spin-statistics is preserved. We find that leptogenesis can be easily explained within this model, without upsetting the solar, atmospheric and reactor neutrino data. Leptogenesis occurs without lepton number violation and the non-equilibrium condition. We consider only three active Dirac neutrinos, and no new particles or symmetries are introduced.
|
2102.08954
|
Peter Stoffer
|
Jason Aebischer, Wouter Dekens, Elizabeth E. Jenkins, Aneesh V.
Manohar, Dipan Sengupta, Peter Stoffer
|
Effective field theory interpretation of lepton magnetic and electric
dipole moments
|
34 pages, 7 figures; v2: numbers updated to new experimental value
for g-2; version published in JHEP
|
JHEP 07 (2021) 107
|
10.1007/JHEP07(2021)107
|
UWThPh 2021-2
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We perform a model-independent analysis of the magnetic and electric dipole
moments of the muon and electron. We give expressions for the dipole moments in
terms of operator coefficients of the low-energy effective field theory (LEFT)
and the Standard Model effective field theory (SMEFT). We use one-loop
renormalization group improved perturbation theory, including the one-loop
matching from SMEFT onto LEFT, and one-loop lepton matrix elements of the
effective-theory operators. Semileptonic four-fermion operators involving light
quarks give sizable non-perturbative contributions to the dipole moments, which
are included in our analysis. We find that only a very limited set of the SMEFT
operators is able to generate the current deviation of the magnetic moment of
the muon from its Standard Model expectation.
|
[
{
"created": "Wed, 17 Feb 2021 19:00:00 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Nov 2021 12:37:32 GMT",
"version": "v2"
}
] |
2021-11-12
|
[
[
"Aebischer",
"Jason",
""
],
[
"Dekens",
"Wouter",
""
],
[
"Jenkins",
"Elizabeth E.",
""
],
[
"Manohar",
"Aneesh V.",
""
],
[
"Sengupta",
"Dipan",
""
],
[
"Stoffer",
"Peter",
""
]
] |
We perform a model-independent analysis of the magnetic and electric dipole moments of the muon and electron. We give expressions for the dipole moments in terms of operator coefficients of the low-energy effective field theory (LEFT) and the Standard Model effective field theory (SMEFT). We use one-loop renormalization group improved perturbation theory, including the one-loop matching from SMEFT onto LEFT, and one-loop lepton matrix elements of the effective-theory operators. Semileptonic four-fermion operators involving light quarks give sizable non-perturbative contributions to the dipole moments, which are included in our analysis. We find that only a very limited set of the SMEFT operators is able to generate the current deviation of the magnetic moment of the muon from its Standard Model expectation.
|
1509.06577
|
Poberezhnyuk Roman
|
R. V. Poberezhnyuk, M. I. Gorenstein, M. Gazdzicki
|
Fluctuations in the Statistical Model of the Early Stage of
nucleus-nucleus collisions
|
11 pages, 9 figures
| null |
10.5506/APhysPolB.47.2055
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Predictions on fluctuations of hadron production properties in central heavy
ion collisions are presented. They are based on the Statistical Model of the
Early Stage and extend previously published results by considering the strongly
intensive measures of fluctuations. In several of the considered cases a
significant change in collision energy dependence of calculated quantities as a
result of the phase transition is predicted. This provides an opportunity to
observe new signals of the onset of deconfinement in heavy ion collisions
experiments.
|
[
{
"created": "Tue, 22 Sep 2015 12:50:53 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Sep 2015 13:04:06 GMT",
"version": "v2"
}
] |
2016-09-21
|
[
[
"Poberezhnyuk",
"R. V.",
""
],
[
"Gorenstein",
"M. I.",
""
],
[
"Gazdzicki",
"M.",
""
]
] |
Predictions on fluctuations of hadron production properties in central heavy ion collisions are presented. They are based on the Statistical Model of the Early Stage and extend previously published results by considering the strongly intensive measures of fluctuations. In several of the considered cases a significant change in collision energy dependence of calculated quantities as a result of the phase transition is predicted. This provides an opportunity to observe new signals of the onset of deconfinement in heavy ion collisions experiments.
|
2203.17093
|
Roberta Calabrese
|
Roberta Calabrese, Marco Chianese, Damiano F.G. Fiorillo, Ninetta
Saviano
|
Electron scattering of light new particles from evaporating primordial
black holes
|
11 pages, 3 figures v2: version published in Physical Review D text
typo corrects
| null |
10.1103/PhysRevD.105.103024
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
Primordial black holes are a possible component of dark matter, and a most
promising way of investigating them is through the product of their Hawking
evaporation. As a result of this process, any species lighter than the Hawking
temperature is emitted, including possible new particles beyond the Standard
Model. These can then be detected in lab-based experiments via their
interaction with the Standard Model particles. In a previous work, we have
first proposed and studied this scenario in the presence of an interaction
between the light new species and nucleons. Here we extend this discussion to
include the case of interaction with electrons. We show that the simultaneous
presence of primordial black holes and species lighter than about $100$ MeV can
be constrained by the measurements of direct detection experiments, such as
XENON1T, and water Cherenkov neutrino detectors, such as Super-Kamiokande. Our
results provide a complementary and alternative way of investigation with
respect to cosmological and collider searches.
|
[
{
"created": "Thu, 31 Mar 2022 15:09:54 GMT",
"version": "v1"
},
{
"created": "Tue, 24 May 2022 08:19:02 GMT",
"version": "v2"
},
{
"created": "Wed, 15 Jun 2022 12:23:28 GMT",
"version": "v3"
}
] |
2022-06-16
|
[
[
"Calabrese",
"Roberta",
""
],
[
"Chianese",
"Marco",
""
],
[
"Fiorillo",
"Damiano F. G.",
""
],
[
"Saviano",
"Ninetta",
""
]
] |
Primordial black holes are a possible component of dark matter, and a most promising way of investigating them is through the product of their Hawking evaporation. As a result of this process, any species lighter than the Hawking temperature is emitted, including possible new particles beyond the Standard Model. These can then be detected in lab-based experiments via their interaction with the Standard Model particles. In a previous work, we have first proposed and studied this scenario in the presence of an interaction between the light new species and nucleons. Here we extend this discussion to include the case of interaction with electrons. We show that the simultaneous presence of primordial black holes and species lighter than about $100$ MeV can be constrained by the measurements of direct detection experiments, such as XENON1T, and water Cherenkov neutrino detectors, such as Super-Kamiokande. Our results provide a complementary and alternative way of investigation with respect to cosmological and collider searches.
|
2204.12018
|
Mohamed Krab
|
H. Abouabid, A. Arhrib, R. Benbrik, M. Krab, M. Ouchemhou
|
Is the new CDF $M_W$ measurement consistent with the two higgs doublet
model?
|
11 pages, 6 figures
| null |
10.1016/j.nuclphysb.2023.116143
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Motivated by the new CDF measurement of the $W$ boson mass reported recently
which clearly illustrates a large deviation compared to the Standard Model (SM)
prediction. In the present paper, we study the Two-Higgs Doublet Model (2HDM)
contributions to $M_W$ and its phenomenological implications in the case where
the heavy CP-even $H$ is identified as the observed Higgs boson with a mass of
$125$ GeV. Taking into account theoretical and all the available experimental
constraints as well as the new CDF measurement, we demonstrate that the 2HDM
parameter space can provide a large correction which predicts the W mass close
to the new CDF $M_W$ measurement. It is found that $M_{H\pm}=M_A$ is excluded
and the splitting of the charged Higgs boson with all other states is positive.
We also discuss the consequence on the effective mixing angle
$\sin^2\theta_{\text{eff}}$ as well as the phenomenological implications on the
charged Higgs and CP-odd decays.
|
[
{
"created": "Tue, 26 Apr 2022 01:20:53 GMT",
"version": "v1"
},
{
"created": "Sun, 8 May 2022 15:48:34 GMT",
"version": "v2"
}
] |
2023-04-05
|
[
[
"Abouabid",
"H.",
""
],
[
"Arhrib",
"A.",
""
],
[
"Benbrik",
"R.",
""
],
[
"Krab",
"M.",
""
],
[
"Ouchemhou",
"M.",
""
]
] |
Motivated by the new CDF measurement of the $W$ boson mass reported recently which clearly illustrates a large deviation compared to the Standard Model (SM) prediction. In the present paper, we study the Two-Higgs Doublet Model (2HDM) contributions to $M_W$ and its phenomenological implications in the case where the heavy CP-even $H$ is identified as the observed Higgs boson with a mass of $125$ GeV. Taking into account theoretical and all the available experimental constraints as well as the new CDF measurement, we demonstrate that the 2HDM parameter space can provide a large correction which predicts the W mass close to the new CDF $M_W$ measurement. It is found that $M_{H\pm}=M_A$ is excluded and the splitting of the charged Higgs boson with all other states is positive. We also discuss the consequence on the effective mixing angle $\sin^2\theta_{\text{eff}}$ as well as the phenomenological implications on the charged Higgs and CP-odd decays.
|
2204.11755
|
Mohammed Boukidi
|
Rachid Benbrik (1), Mohammed Boukidi (1), Bouzid Manaut (2) ((1)
Polydisciplinary Faculty, Laboratory of Fundamental and Applied Physics, Cadi
Ayyad University, Sidi Bouzid, Safi, Morocco, (2) Polydisciplinary Faculty,
Laboratory of Research in Physics and Engineering Sciences, Team of Modern
and Applied Physics, Sultan Moulay Slimane University, Beni Mellal, Morocco)
|
Interpreting the $\boldsymbol{W}$-Mass and Muon $\boldsymbol{(g_\mu-2)}$
Anomalies within a 2-Higgs Doublet Model
|
12 pages, 12 figures. A new section on (g-2) has been added and the
discussion has been revised
| null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
In this study, we investigate the anomalous magnetic moment of the muon
$(g_\mu-2)$ as reported by Fermilab (FNAL), along with the recent measurement
of the $W$-boson mass by the CDF-II collaboration. Both findings show
significant deviations from the predictions of the Standard Model (SM), hinting
at the possibility of new physics. Our focus is on the Type III
two-Higgs-doublet model (2HDM), wherein both Higgs doublets couple with all
fermions, leading to the induction of flavour-changing neutral currents (FCNCs)
at the tree level. Within this framework, we investigate a
lepton-flavour-violating (LFV) scenario, aiming to explain both observed
anomalies, while satisfying the up-to-date theoretical and experimental
constraints.
|
[
{
"created": "Mon, 25 Apr 2022 16:16:18 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Apr 2022 17:56:20 GMT",
"version": "v2"
},
{
"created": "Thu, 4 Jan 2024 15:57:25 GMT",
"version": "v3"
}
] |
2024-01-05
|
[
[
"Benbrik",
"Rachid",
""
],
[
"Boukidi",
"Mohammed",
""
],
[
"Manaut",
"Bouzid",
""
]
] |
In this study, we investigate the anomalous magnetic moment of the muon $(g_\mu-2)$ as reported by Fermilab (FNAL), along with the recent measurement of the $W$-boson mass by the CDF-II collaboration. Both findings show significant deviations from the predictions of the Standard Model (SM), hinting at the possibility of new physics. Our focus is on the Type III two-Higgs-doublet model (2HDM), wherein both Higgs doublets couple with all fermions, leading to the induction of flavour-changing neutral currents (FCNCs) at the tree level. Within this framework, we investigate a lepton-flavour-violating (LFV) scenario, aiming to explain both observed anomalies, while satisfying the up-to-date theoretical and experimental constraints.
|
1002.3048
|
Boris Blok
|
B. Blok, L. Frankfurt, M. Strikman
|
DGLAP versus perturbative Pomeron in large momentum transfer hard
diffractive processes at HERA and LHC
|
12 pages, 3 figures
|
Phys.Lett.B690:159-163,2010
|
10.1016/j.physletb.2010.05.015
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We evaluate within the LO DGLAP approximation the dependence on energy of the
cross section of the photo(electro)production of vector meson V
($V=J/\psi,...$) in the hard elastic processes off a parton $\gamma^*+g\to
V=J/\psi+g$ as the function of momentum transfer $t=(q_{\gamma}-p_V)^2$. We
demonstrate that in the limit $-t \ge m_V^2 +Q^2$ the cross section does not
contain double logarithmic terms in any order of the DGLAP approximation
leading to the energy independent cross section. Thus the energy dependence of
cross section $\gamma^*+p\to J/\psi+{\rm rapidity ~gap} +X$ is governed at
large $t$ by the gluon distribution within a proton, i.e. it is unambiguously
predicted within the DGLAP approximation including the stronger $W_{\gamma N}$
dependence at larger $-t$ . This prediction explains recent HERA data. The
calculations which follow perturbative Pomeron logic predict opposite trend of
a weaker $W_{\gamma N}$ dependence at larger $t$. We explain that at the HERA
energies double logarithmic terms characteristic for DGLAP approximation
dominate in the hard processes as the consequence of constraints due to
energy-momentum conservation. We give predictions for ultraperipheral hard
diffractive processes at the LHC and show that these processes are well suited
for looking for the contribution of the single logarithmic terms due to the
gluon emission in the multiRegge kinematics. We also comment on the
interrelation between energy and $t$ dependence of the cross sections of the
hard exclusive processes.
|
[
{
"created": "Tue, 16 Feb 2010 10:48:15 GMT",
"version": "v1"
}
] |
2014-11-20
|
[
[
"Blok",
"B.",
""
],
[
"Frankfurt",
"L.",
""
],
[
"Strikman",
"M.",
""
]
] |
We evaluate within the LO DGLAP approximation the dependence on energy of the cross section of the photo(electro)production of vector meson V ($V=J/\psi,...$) in the hard elastic processes off a parton $\gamma^*+g\to V=J/\psi+g$ as the function of momentum transfer $t=(q_{\gamma}-p_V)^2$. We demonstrate that in the limit $-t \ge m_V^2 +Q^2$ the cross section does not contain double logarithmic terms in any order of the DGLAP approximation leading to the energy independent cross section. Thus the energy dependence of cross section $\gamma^*+p\to J/\psi+{\rm rapidity ~gap} +X$ is governed at large $t$ by the gluon distribution within a proton, i.e. it is unambiguously predicted within the DGLAP approximation including the stronger $W_{\gamma N}$ dependence at larger $-t$ . This prediction explains recent HERA data. The calculations which follow perturbative Pomeron logic predict opposite trend of a weaker $W_{\gamma N}$ dependence at larger $t$. We explain that at the HERA energies double logarithmic terms characteristic for DGLAP approximation dominate in the hard processes as the consequence of constraints due to energy-momentum conservation. We give predictions for ultraperipheral hard diffractive processes at the LHC and show that these processes are well suited for looking for the contribution of the single logarithmic terms due to the gluon emission in the multiRegge kinematics. We also comment on the interrelation between energy and $t$ dependence of the cross sections of the hard exclusive processes.
|
0912.0029
|
Piotr Kotko
|
Piotr Kotko and Michal Praszalowicz
|
Photon Distribution Amplitudes in nonlocal chiral quark model
|
38 pages, 9 figures. Refs. added
|
Phys.Rev.D81:034019,2010
|
10.1103/PhysRevD.81.034019
|
TPJU-3/2009
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Photon distribution amplitudes up to twist four are calculated within the
nonlocal chiral quark model with a simple pole ansatz for momentum dependence
of the constituent quark mass. Calculations are performed using modified
electromagnetic vector current in order to satisfy Ward identities. Quark
condensate and magnetic susceptibility of the QCD vacuum entering definitions
of the distribution amplitudes are computed and compared with existing
phenomenological estimates. Both real and off-shell photons are considered and
relevant form factors are calculated. Our results are analytical up to the
numerical solution of certain algebraic equation.
|
[
{
"created": "Mon, 30 Nov 2009 21:46:24 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Dec 2009 00:23:25 GMT",
"version": "v2"
}
] |
2010-06-23
|
[
[
"Kotko",
"Piotr",
""
],
[
"Praszalowicz",
"Michal",
""
]
] |
Photon distribution amplitudes up to twist four are calculated within the nonlocal chiral quark model with a simple pole ansatz for momentum dependence of the constituent quark mass. Calculations are performed using modified electromagnetic vector current in order to satisfy Ward identities. Quark condensate and magnetic susceptibility of the QCD vacuum entering definitions of the distribution amplitudes are computed and compared with existing phenomenological estimates. Both real and off-shell photons are considered and relevant form factors are calculated. Our results are analytical up to the numerical solution of certain algebraic equation.
|
1610.09814
|
Danning Li
|
Danning Li and Mei Huang
|
Chiral phase transition of QCD with $N_f=2+1$ flavors from holography
|
Regular article, 18 pages
| null |
10.1007/JHEP02(2017)042
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Chiral phase transition for three-flavor $N_f=2+1$ QCD with $m_u=m_d\neq m_s$
is investigated in a modified soft-wall holographic QCD model. Solving
temperature dependent chiral condensates from equations of motion of the
modified soft-wall model, we extract the quark mass dependence of the order of
chiral phase transition in the case of $N_f=2+1$, and the result is in
agreement with the "Colombia Plot", which is summarized from lattice
simulations and other non-perturbative methods. First order phase transition is
observed around the three flavor chiral limit $m_{u/d}=0, m_{s}=0$, while at
sufficient large quark masses it turns to be a crossover phase transition. The
first order and crossover regions are separated by a second order phase
transition line. The second order line is divided into two parts by the
$m_{u/d}=m_s$ line, and the $m_s$ dependence of the transition temperature in
these two parts are totally contrast, which might indicate that the two parts
are governed by different universality classes.
|
[
{
"created": "Mon, 31 Oct 2016 07:54:30 GMT",
"version": "v1"
}
] |
2017-03-08
|
[
[
"Li",
"Danning",
""
],
[
"Huang",
"Mei",
""
]
] |
Chiral phase transition for three-flavor $N_f=2+1$ QCD with $m_u=m_d\neq m_s$ is investigated in a modified soft-wall holographic QCD model. Solving temperature dependent chiral condensates from equations of motion of the modified soft-wall model, we extract the quark mass dependence of the order of chiral phase transition in the case of $N_f=2+1$, and the result is in agreement with the "Colombia Plot", which is summarized from lattice simulations and other non-perturbative methods. First order phase transition is observed around the three flavor chiral limit $m_{u/d}=0, m_{s}=0$, while at sufficient large quark masses it turns to be a crossover phase transition. The first order and crossover regions are separated by a second order phase transition line. The second order line is divided into two parts by the $m_{u/d}=m_s$ line, and the $m_s$ dependence of the transition temperature in these two parts are totally contrast, which might indicate that the two parts are governed by different universality classes.
|
1406.5662
|
Mani Tripathi
|
Andrew Askew, Sushil Chauhan, Bjorn Penning, William Shepherd and Mani
Tripathi
|
Searching for Dark Matter at Hadron Colliders
| null |
International Journal of Modern Physics A, Vol. 29 (2014) 1430041
|
10.1142/S0217751X14300415
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Theoretical and experimental techniques employed in dedicated searches for
dark matter at hadron colliders are reviewed. Bounds from the 7 and 8 TeV
proton-proton collisions at the LHC on dark matter interactions have been
collected and the results interpreted. We review the current status of the
Effective Field Theory picture of dark matter interactions with the Standard
Model. Currently, LHC experiments have stronger bounds on operators leading to
spin-dependent scattering than direct detection experiments, while direct
detection probes are more constraining for spin-independent scattering for WIMP
masses above a few GeV.
|
[
{
"created": "Sun, 22 Jun 2014 02:12:21 GMT",
"version": "v1"
}
] |
2014-06-24
|
[
[
"Askew",
"Andrew",
""
],
[
"Chauhan",
"Sushil",
""
],
[
"Penning",
"Bjorn",
""
],
[
"Shepherd",
"William",
""
],
[
"Tripathi",
"Mani",
""
]
] |
Theoretical and experimental techniques employed in dedicated searches for dark matter at hadron colliders are reviewed. Bounds from the 7 and 8 TeV proton-proton collisions at the LHC on dark matter interactions have been collected and the results interpreted. We review the current status of the Effective Field Theory picture of dark matter interactions with the Standard Model. Currently, LHC experiments have stronger bounds on operators leading to spin-dependent scattering than direct detection experiments, while direct detection probes are more constraining for spin-independent scattering for WIMP masses above a few GeV.
|
hep-ph/9706543
|
Andrew Kirk
|
Frank E. Close and Andrew Kirk
|
Implications of the Glueball-qqbar filter on the 1++ nonet
|
21 pages, Latex, 5 Figures
|
Z.Phys.C76:469-474,1997
|
10.1007/s002880050569
|
RAL-97-029, BHAM-HEP/97-03
|
hep-ph
| null |
The application of our glueball-qqbar filter to the centrally produced
KKbarpi system shows that the f1(1285) and f1(1420) have the same behaviour;
namely consistent with the f1(1420) being the partner to the f1(1285) in the
3P1 nonet of axial mesons. We determine a flavour singlet-octet mixing angle of
approximately 50 degrees for this nonet and highlight that the existence of the
supposed f1(1510) needs confirmation.
|
[
{
"created": "Mon, 30 Jun 1997 10:24:38 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Close",
"Frank E.",
""
],
[
"Kirk",
"Andrew",
""
]
] |
The application of our glueball-qqbar filter to the centrally produced KKbarpi system shows that the f1(1285) and f1(1420) have the same behaviour; namely consistent with the f1(1420) being the partner to the f1(1285) in the 3P1 nonet of axial mesons. We determine a flavour singlet-octet mixing angle of approximately 50 degrees for this nonet and highlight that the existence of the supposed f1(1510) needs confirmation.
|
0812.2457
|
Kim Maltman
|
Kim Maltman and Tzahi Yavin
|
Alpha_s from hadronic tau decay data
|
6 pages, 1 figure. Talk given at the 10th International Workshop on
Tau Lepton Physics, Novosibirsk, Russia, Sep. 22-25, 2008
| null |
10.1016/j.nuclphysbps.2009.03.013
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss the extraction of alpha_s using isovector hadronic tau decay data
and sum rules constructed specifically to suppress contributions associated
with poorly known higher dimension condensates. We show, first, that problems
with the treatment of such contributions affect earlier related analyses and,
second, that these problems can be brought under good theoretical control
through the use of an alternate analysis strategy. Our results, run up to the
n_f=5 regime, correspond to alpha_s(M_Z^2)=0.1187(16), in excellent agreement
with the recently updated global fit to electroweak data at the Z scale and
other high-scale direct determinations.
|
[
{
"created": "Fri, 12 Dec 2008 20:49:59 GMT",
"version": "v1"
}
] |
2015-05-13
|
[
[
"Maltman",
"Kim",
""
],
[
"Yavin",
"Tzahi",
""
]
] |
We discuss the extraction of alpha_s using isovector hadronic tau decay data and sum rules constructed specifically to suppress contributions associated with poorly known higher dimension condensates. We show, first, that problems with the treatment of such contributions affect earlier related analyses and, second, that these problems can be brought under good theoretical control through the use of an alternate analysis strategy. Our results, run up to the n_f=5 regime, correspond to alpha_s(M_Z^2)=0.1187(16), in excellent agreement with the recently updated global fit to electroweak data at the Z scale and other high-scale direct determinations.
|
2209.08914
|
Jorge J. Mart\'inez de Lejarza
|
Jorge J. Mart\'inez de Lejarza, Leandro Cieri, Germ\'an Rodrigo
|
Quantum jet clustering with LHC simulated data
|
6 pages, 1 figure, 1 table, Contribution to 41st International
Conference on High Energy physics - ICHEP 2022, 6-13 July 2022, Bologna,
Italy
|
PoS ICHEP2022 (2022) 241
|
10.22323/1.414.0241
|
IFIC/22-26
|
hep-ph quant-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the case where quantum computing could improve jet clustering by
considering two new quantum algorithms that might speed up classical jet
clustering algorithms. The first one is a quantum subroutine to compute a
Minkowski-based distance between two data points, while the second one consists
of a quantum circuit to track the rough maximum into a list of unsorted data.
When one or both algorithms are implemented in classical versions of well-known
clustering algorithms (K-means, Affinity Propagation and $k_T$-jet) we obtain
efficiencies comparable to those of their classical counterparts. Furthermore,
in the first two algorithms, an exponential speed up in dimensionality and data
length can be achieved when applying the distance or the maximum search
algorithm. In the $k_T$ algorithm, a quantum version of the same order as
FastJet is achieved.
|
[
{
"created": "Mon, 19 Sep 2022 10:51:13 GMT",
"version": "v1"
}
] |
2022-11-23
|
[
[
"de Lejarza",
"Jorge J. Martínez",
""
],
[
"Cieri",
"Leandro",
""
],
[
"Rodrigo",
"Germán",
""
]
] |
We study the case where quantum computing could improve jet clustering by considering two new quantum algorithms that might speed up classical jet clustering algorithms. The first one is a quantum subroutine to compute a Minkowski-based distance between two data points, while the second one consists of a quantum circuit to track the rough maximum into a list of unsorted data. When one or both algorithms are implemented in classical versions of well-known clustering algorithms (K-means, Affinity Propagation and $k_T$-jet) we obtain efficiencies comparable to those of their classical counterparts. Furthermore, in the first two algorithms, an exponential speed up in dimensionality and data length can be achieved when applying the distance or the maximum search algorithm. In the $k_T$ algorithm, a quantum version of the same order as FastJet is achieved.
|
2204.08067
|
Wan-Zhe Feng
|
Kai-Yu Zhang, Wan-Zhe Feng
|
Explaining the $W$ boson mass anomaly and dark matter with a $U(1)$ dark
sector
|
20 pages, 5 figures
|
Chin. Phys. C 47, no.2, 023107 (2023)
|
10.1088/1674-1137/aca585
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The $W$ boson mass recently reported by the CDF collaboration shows a
deviation from the standard model prediction with an excess at $7\sigma$ level.
We investigate two simple extensions of the standard model with an extra $U(1)$
dark sector. One is the $U(1)_x$ extension, where the $U(1)_x$ gauge field
mixes with the standard model through gauge kinetic terms. The other is a
general $U(1)_{\mathbf{A} Y+\mathbf{B} q}$ extension of the standard model.
Fitting various experimental constraints we find the $U(1)_x$ extension with
only kinetic mixing can enhance the $W$ boson mass for at most 10~MeV. While
the $U(1)_{\mathbf{A} Y+\mathbf{B} q}$ extension can easily generate 77~MeV
enhancement of the $W$ boson mass and also offer a viable dark matter candidate
with mass ranging from several hundred GeV to TeV, which may be detected by
future dark matter direct detection experiments with improved sensitivities.
|
[
{
"created": "Sun, 17 Apr 2022 19:00:02 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Apr 2022 17:40:01 GMT",
"version": "v2"
},
{
"created": "Wed, 11 Jan 2023 07:30:00 GMT",
"version": "v3"
}
] |
2023-01-12
|
[
[
"Zhang",
"Kai-Yu",
""
],
[
"Feng",
"Wan-Zhe",
""
]
] |
The $W$ boson mass recently reported by the CDF collaboration shows a deviation from the standard model prediction with an excess at $7\sigma$ level. We investigate two simple extensions of the standard model with an extra $U(1)$ dark sector. One is the $U(1)_x$ extension, where the $U(1)_x$ gauge field mixes with the standard model through gauge kinetic terms. The other is a general $U(1)_{\mathbf{A} Y+\mathbf{B} q}$ extension of the standard model. Fitting various experimental constraints we find the $U(1)_x$ extension with only kinetic mixing can enhance the $W$ boson mass for at most 10~MeV. While the $U(1)_{\mathbf{A} Y+\mathbf{B} q}$ extension can easily generate 77~MeV enhancement of the $W$ boson mass and also offer a viable dark matter candidate with mass ranging from several hundred GeV to TeV, which may be detected by future dark matter direct detection experiments with improved sensitivities.
|
2103.02159
|
Patrick Barry
|
N. Y. Cao, P. C. Barry, N. Sato, W. Melnitchouk
|
Towards the three-dimensional parton structure of the pion: Integrating
transverse momentum data into global QCD analysis
|
40 pages, 16 figures
|
Phys. Rev. D 103, 114014 (2021)
|
10.1103/PhysRevD.103.114014
|
JLAB-THY-21-3328
|
hep-ph hep-ex hep-lat nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We perform a new Monte Carlo QCD analysis of pion parton distribution
functions, including, for the first time, transverse momentum dependent
pion-nucleus Drell-Yan cross sections together with $p_{\rm T}$-integrated
Drell-Yan and leading neutron electroproduction data from HERA. We assess the
sensitivity of the Monte Carlo fits to kinematic cuts, factorization scale, and
parametrization choice, and we discuss the impact of the various datasets on
the pion's quark and gluon distributions. This study provides the necessary
step towards the simultaneous analysis of collinear and transverse momentum
dependent pion distributions and the determination of the pion's
three-dimensional structure.
|
[
{
"created": "Wed, 3 Mar 2021 03:51:26 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Nov 2021 06:15:36 GMT",
"version": "v2"
}
] |
2021-12-01
|
[
[
"Cao",
"N. Y.",
""
],
[
"Barry",
"P. C.",
""
],
[
"Sato",
"N.",
""
],
[
"Melnitchouk",
"W.",
""
]
] |
We perform a new Monte Carlo QCD analysis of pion parton distribution functions, including, for the first time, transverse momentum dependent pion-nucleus Drell-Yan cross sections together with $p_{\rm T}$-integrated Drell-Yan and leading neutron electroproduction data from HERA. We assess the sensitivity of the Monte Carlo fits to kinematic cuts, factorization scale, and parametrization choice, and we discuss the impact of the various datasets on the pion's quark and gluon distributions. This study provides the necessary step towards the simultaneous analysis of collinear and transverse momentum dependent pion distributions and the determination of the pion's three-dimensional structure.
|
1805.12444
|
Ricardo Vazquez
|
X. Feal, C. Pajares, and R.A. Vazquez
|
Thermal behavior and entanglement in Pb-Pb and p-p collisions
|
16 pages, 8 figures
|
Phys. Rev. C 99, 015205 (2019)
|
10.1103/PhysRevC.99.015205
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The thermalization of the particles produced in collisions of small size
objects can be achieved by quantum entanglement of the partons of the initial
state as it was analyzed recently in proton-proton collisions. We extend such
study to Pb-Pb collisions and to different multiplicities of proton-proton
collisions. We observe that, in all cases, the effective temperature is
approximately proportional to the hard scale of the collision. We show that
such relation between the thermalization temperature and the hard scale can be
explained as a consequence of the clustering of the color sources. The
fluctuations on the number of parton states decreases with multiplicity in
Pb-Pb collisions as far as the width of the transverse momentum distributions
decreases, contrary to the p-p case. We relate these fluctuations to the
temperature time fluctuations by means of a Langevin equation for the white
noise due to the quench of a hard parton collision.
|
[
{
"created": "Thu, 31 May 2018 12:50:15 GMT",
"version": "v1"
}
] |
2019-01-30
|
[
[
"Feal",
"X.",
""
],
[
"Pajares",
"C.",
""
],
[
"Vazquez",
"R. A.",
""
]
] |
The thermalization of the particles produced in collisions of small size objects can be achieved by quantum entanglement of the partons of the initial state as it was analyzed recently in proton-proton collisions. We extend such study to Pb-Pb collisions and to different multiplicities of proton-proton collisions. We observe that, in all cases, the effective temperature is approximately proportional to the hard scale of the collision. We show that such relation between the thermalization temperature and the hard scale can be explained as a consequence of the clustering of the color sources. The fluctuations on the number of parton states decreases with multiplicity in Pb-Pb collisions as far as the width of the transverse momentum distributions decreases, contrary to the p-p case. We relate these fluctuations to the temperature time fluctuations by means of a Langevin equation for the white noise due to the quench of a hard parton collision.
|
0707.0618
|
Howard Baer
|
Howard Baer, Andrew Box, Eun-Kyung Park and Xerxes Tata
|
Implications of Compressed Supersymmetry for Collider and Dark Matter
Searches
|
22 pages including 24 eps figures
|
JHEP 0708:060,2007
|
10.1088/1126-6708/2007/08/060
|
FSU-HEP-070704, UH-511-1108-07
|
hep-ph
| null |
Martin has proposed a scenario dubbed ``compressed supersymmetry'' (SUSY)
where the MSSM is the effective field theory between energy scales M_{\rm weak}
and M_{\rm GUT}, but with the GUT scale SU(3) gaugino mass M_3<< M_1 or M_2. As
a result, squark and gluino masses are suppressed relative to slepton, chargino
and neutralino masses, leading to a compressed sparticle mass spectrum, and
where the dark matter relic density in the early universe may be dominantly
governed by neutralino annihilation into ttbar pairs via exchange of a light
top squark. We explore the dark matter and collider signals expected from
compressed SUSY for two distinct model lines with differing assumptions about
GUT scale gaugino mass parameters. For dark matter signals, the compressed
squark spectrum leads to an enhancement in direct detection rates compared to
models with unified gaugino masses. Meanwhile, neutralino halo annihilation
rates to gamma rays and anti-matter are also enhanced relative to related
scenarios with unified gaugino masses but, depending on the halo dark matter
distribution, may yet be below the sensitivity of indirect searches underway.
In the case of collider signals, we compare the rates for the potentially
dominant decay modes of the stop_1 which may be expected to be produced in
cascade decay chains at the LHC: \tst_1\to c\tz_1 and \tst_1\to bW\tz_1. We
examine the extent to which multilepton signal rates are reduced when the
two-body decay mode dominates. For the model lines that we examine here, the
multi-lepton signals, though reduced, still remain observable at the LHC.
|
[
{
"created": "Wed, 4 Jul 2007 14:07:18 GMT",
"version": "v1"
}
] |
2014-11-18
|
[
[
"Baer",
"Howard",
""
],
[
"Box",
"Andrew",
""
],
[
"Park",
"Eun-Kyung",
""
],
[
"Tata",
"Xerxes",
""
]
] |
Martin has proposed a scenario dubbed ``compressed supersymmetry'' (SUSY) where the MSSM is the effective field theory between energy scales M_{\rm weak} and M_{\rm GUT}, but with the GUT scale SU(3) gaugino mass M_3<< M_1 or M_2. As a result, squark and gluino masses are suppressed relative to slepton, chargino and neutralino masses, leading to a compressed sparticle mass spectrum, and where the dark matter relic density in the early universe may be dominantly governed by neutralino annihilation into ttbar pairs via exchange of a light top squark. We explore the dark matter and collider signals expected from compressed SUSY for two distinct model lines with differing assumptions about GUT scale gaugino mass parameters. For dark matter signals, the compressed squark spectrum leads to an enhancement in direct detection rates compared to models with unified gaugino masses. Meanwhile, neutralino halo annihilation rates to gamma rays and anti-matter are also enhanced relative to related scenarios with unified gaugino masses but, depending on the halo dark matter distribution, may yet be below the sensitivity of indirect searches underway. In the case of collider signals, we compare the rates for the potentially dominant decay modes of the stop_1 which may be expected to be produced in cascade decay chains at the LHC: \tst_1\to c\tz_1 and \tst_1\to bW\tz_1. We examine the extent to which multilepton signal rates are reduced when the two-body decay mode dominates. For the model lines that we examine here, the multi-lepton signals, though reduced, still remain observable at the LHC.
|
1912.08797
|
Wen Yin
|
Takehiko Asaka, Hiroyuki Ishida, and Wen Yin
|
Direct baryogenesis in the broken phase
|
20pages, 4 figures, published version
| null |
10.1007/JHEP07(2020)174
|
KEK-TH-2179
|
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We show a new mechanism for baryogenesis where the reheating temperature can
be smaller than the electroweak scale. The baryon number symmetry is violated
by a dimension nine operator which conserves a baryon parity. A high energy
quark from the decay of a heavy particle, $e.g.$ inflaton, modulus or
gravitino, undergoes flavor oscillation, and is thermalized due to the
scatterings with the ambient thermal plasma. We point out that the baryon
asymmetry of our universe can be generated due to the scatterings via the
baryon number violating operator. Our scenario can be tested in
neutron-antineutron oscillation experiments as well as other terrestrial
experiments.
|
[
{
"created": "Wed, 18 Dec 2019 18:51:26 GMT",
"version": "v1"
},
{
"created": "Mon, 17 May 2021 13:09:59 GMT",
"version": "v2"
}
] |
2021-05-18
|
[
[
"Asaka",
"Takehiko",
""
],
[
"Ishida",
"Hiroyuki",
""
],
[
"Yin",
"Wen",
""
]
] |
We show a new mechanism for baryogenesis where the reheating temperature can be smaller than the electroweak scale. The baryon number symmetry is violated by a dimension nine operator which conserves a baryon parity. A high energy quark from the decay of a heavy particle, $e.g.$ inflaton, modulus or gravitino, undergoes flavor oscillation, and is thermalized due to the scatterings with the ambient thermal plasma. We point out that the baryon asymmetry of our universe can be generated due to the scatterings via the baryon number violating operator. Our scenario can be tested in neutron-antineutron oscillation experiments as well as other terrestrial experiments.
|
hep-ph/0510133
|
Mustafa Savci
|
T. M. Aliev, M. Savci
|
P-odd asymmetries in polarized (Lambda_b -> Lambda l^+ l^-) decay
|
25 pages, 11 figures, LaTeX formatted
| null | null |
metu-phys-hep-05-25
|
hep-ph
| null |
We calculate various P-odd asymmetries appearing in the differential decay
width for the cascade decay (Lambda_b -> Lambda(-> a+b) V^* (-> l^+ l^-)) with
polarized and unpolarized heavy baryons including new vector type interactions
and using the helicity amplitudes. It is obtained that the study of P-odd
asymmetries can serve a good test for establishing new physics beyond the SM.
|
[
{
"created": "Tue, 11 Oct 2005 16:08:41 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Aliev",
"T. M.",
""
],
[
"Savci",
"M.",
""
]
] |
We calculate various P-odd asymmetries appearing in the differential decay width for the cascade decay (Lambda_b -> Lambda(-> a+b) V^* (-> l^+ l^-)) with polarized and unpolarized heavy baryons including new vector type interactions and using the helicity amplitudes. It is obtained that the study of P-odd asymmetries can serve a good test for establishing new physics beyond the SM.
|
0907.2533
|
Zhun Lu
|
Sergey Kovalenko, Zhun Lu, Ivan Schmidt
|
Lepton Number Violating Processes Mediated by Majorana Neutrinos at
Hadron Colliders
|
18 pages,6 figures
|
Phys.Rev.D80:073014,2009
|
10.1103/PhysRevD.80.073014
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the Lepton number violating like-sign dilepton processes $h_1 h_2
\to l^\pm l^{\prime \pm} jj X$ and $h_1 h_2 \to l^\pm l^{\prime \pm} W^\pm X$,
mediated by heavy GeV scale Majorana neutrinos. We focus on the resonantly
enhanced contributions with a nearly on-mass-shell Majorana neutrino in the
s-channel. We study the constraints on like-sign dilepton production at the
Tevatron and the LHC on the basis of the existing experimental limits on the
masses of heavy neutrinos and their mixings $U_{\alpha N}$ with $\alpha =
\nu_{e}, \nu_{\mu}, \nu_{\tau}$. Special attention is paid to the constraints
from neutrinoless double beta decay. We note that searches for like-sign
$e^{\pm} e^{\pm}$ events at Tevatron and LHC may shed light on CP-violation in
neutrino sector. We also discuss the conditions under which it is possible to
extract individual constraints on the mixing matrix elements in a model
independent way.
|
[
{
"created": "Wed, 15 Jul 2009 09:42:31 GMT",
"version": "v1"
}
] |
2009-11-05
|
[
[
"Kovalenko",
"Sergey",
""
],
[
"Lu",
"Zhun",
""
],
[
"Schmidt",
"Ivan",
""
]
] |
We study the Lepton number violating like-sign dilepton processes $h_1 h_2 \to l^\pm l^{\prime \pm} jj X$ and $h_1 h_2 \to l^\pm l^{\prime \pm} W^\pm X$, mediated by heavy GeV scale Majorana neutrinos. We focus on the resonantly enhanced contributions with a nearly on-mass-shell Majorana neutrino in the s-channel. We study the constraints on like-sign dilepton production at the Tevatron and the LHC on the basis of the existing experimental limits on the masses of heavy neutrinos and their mixings $U_{\alpha N}$ with $\alpha = \nu_{e}, \nu_{\mu}, \nu_{\tau}$. Special attention is paid to the constraints from neutrinoless double beta decay. We note that searches for like-sign $e^{\pm} e^{\pm}$ events at Tevatron and LHC may shed light on CP-violation in neutrino sector. We also discuss the conditions under which it is possible to extract individual constraints on the mixing matrix elements in a model independent way.
|
hep-ph/0309083
|
Hai-cang Ren
|
Kurt Haller and Hai-cang Ren
|
The Coulomb interaction and the inverse Faddeev-Popov operator in QCD
| null |
Mod.Phys.Lett. A18 (2003) 2749-2754
|
10.1142/S0217732303012416
| null |
hep-ph
| null |
We give a proof of a local relation between the inverse Faddeev-Popov
operator and the non-Abelian Coulomb interaction between color charges.
|
[
{
"created": "Mon, 8 Sep 2003 21:14:30 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Sep 2003 17:51:55 GMT",
"version": "v2"
}
] |
2009-11-10
|
[
[
"Haller",
"Kurt",
""
],
[
"Ren",
"Hai-cang",
""
]
] |
We give a proof of a local relation between the inverse Faddeev-Popov operator and the non-Abelian Coulomb interaction between color charges.
|
2205.13291
|
Manibrata Sen
|
Manibrata Sen
|
Constraining pseudo-Dirac neutrinos from a galactic core-collapse
supernova
|
Contribution to the 2022 Electroweak session of the 56th Rencontres
de Moriond
| null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
Neutrinos can be pseudo-Dirac in nature -- Majorana fermions behaving as
Dirac fermions for all practical purposes. In such a scenario, active and
sterile neutrinos are quasi-degenerate in mass, and hence oscillations between
the two, due to their tiny mass-squared difference $(\delta m^2)$, can develop
only over very long baselines. Under this hypothesis, we analyze the neutrino
data from SN1987A, and find a mild preference for a non-zero mass-squared
difference. The same data can also be used to exclude values of $\delta m^2\sim
10^{-20}{\rm eV}^2$ - the smallest constrained so far. We also discuss how
next-generation experiments like the DUNE and Hyper-Kamiokande can probe this
scenario for a future galactic supernova.
|
[
{
"created": "Thu, 26 May 2022 12:09:25 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Aug 2023 14:35:08 GMT",
"version": "v2"
}
] |
2023-08-17
|
[
[
"Sen",
"Manibrata",
""
]
] |
Neutrinos can be pseudo-Dirac in nature -- Majorana fermions behaving as Dirac fermions for all practical purposes. In such a scenario, active and sterile neutrinos are quasi-degenerate in mass, and hence oscillations between the two, due to their tiny mass-squared difference $(\delta m^2)$, can develop only over very long baselines. Under this hypothesis, we analyze the neutrino data from SN1987A, and find a mild preference for a non-zero mass-squared difference. The same data can also be used to exclude values of $\delta m^2\sim 10^{-20}{\rm eV}^2$ - the smallest constrained so far. We also discuss how next-generation experiments like the DUNE and Hyper-Kamiokande can probe this scenario for a future galactic supernova.
|
1209.5538
|
Giampiero Passarino
|
Giampiero Passarino
|
NLO Inspired Effective Lagrangians for Higgs Physics
|
42 pages
| null |
10.1016/j.nuclphysb.2012.11.018
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Either late autumn this year or latest early next year LHC should have
results with 2-3 times the current data which migth give first clues on the
couplings of the light narrow resonance. A strategy for measuring deviations
from the Standard Model can be based on using the "full" Standard Model,
including all available QCD and electroweak higher-order corrections, and
supplement it with d= 6 local operators. Their Wilson coefficients are assumed
to be small enough that they can be treated at leading order. Examples of the
connection of local operators with BSM Lagrangians are presented as well as a
discussion of Lagrangians with/without decoupling of heavy degrees of freedom.
The whole strategy is critically reviewed in the light of internal consistency.
|
[
{
"created": "Tue, 25 Sep 2012 08:43:12 GMT",
"version": "v1"
}
] |
2015-06-11
|
[
[
"Passarino",
"Giampiero",
""
]
] |
Either late autumn this year or latest early next year LHC should have results with 2-3 times the current data which migth give first clues on the couplings of the light narrow resonance. A strategy for measuring deviations from the Standard Model can be based on using the "full" Standard Model, including all available QCD and electroweak higher-order corrections, and supplement it with d= 6 local operators. Their Wilson coefficients are assumed to be small enough that they can be treated at leading order. Examples of the connection of local operators with BSM Lagrangians are presented as well as a discussion of Lagrangians with/without decoupling of heavy degrees of freedom. The whole strategy is critically reviewed in the light of internal consistency.
|
hep-ph/9811416
| null |
Jia-Sheng Xu and Hong-An Peng (Peking Unv.)
|
Associated jpsi + gamma production through double Pomeron exchange: The
nature of the Pomeron and hard diffractive factorization breaking
|
RevTex, 9 Pages, 2 PS figures
|
Commun.Theor.Phys. 34 (2000) 129-134
| null |
PKU-TP-98-28
|
hep-ph
| null |
We present a study of associated jpsi + gamma production through double
Pomeron exchange at energies reached at the Fermilab Tevatron and CERN LHC
based on the Ingelman-Schlein model for hard diffractive scattering and the
factorization formalism of nonrelativistic QCD for quarkonia production. We
find that this process (p + pbar \to p + pbar + jpsi + gamma + X) can be used
to probe the gluon content of the Pomeron and study the natrue of hard
diffractive factorization breaking.
|
[
{
"created": "Fri, 20 Nov 1998 09:50:42 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Xu",
"Jia-Sheng",
"",
"Peking Unv."
],
[
"Peng",
"Hong-An",
"",
"Peking Unv."
]
] |
We present a study of associated jpsi + gamma production through double Pomeron exchange at energies reached at the Fermilab Tevatron and CERN LHC based on the Ingelman-Schlein model for hard diffractive scattering and the factorization formalism of nonrelativistic QCD for quarkonia production. We find that this process (p + pbar \to p + pbar + jpsi + gamma + X) can be used to probe the gluon content of the Pomeron and study the natrue of hard diffractive factorization breaking.
|
0810.5101
|
Jens Salomon
|
A. Bauer, L. Mihaila, J. Salomon
|
Matching coefficients for alpha_s and m_b to O(alpha_s^2) in the MSSM
|
25 pages, 5 figures
|
JHEP 0902:037,2009
|
10.1088/1126-6708/2009/02/037
|
SFB/CPP-08-75, TTP/08-25
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We compute the exact two-loop matching coefficients for the strong coupling
constant alpha_s and the bottom-quark mass m_b within the Minimal
Supersymmetric Standard Model (MSSM), taking into account
O(alpha_s^2) contributions from Supersymmetric Quantum Chromodynamics (SQCD).
We find that the explicit mass pattern of the supersymmetric particles has a
significant impact on the predictions of alpha_s and m_b at high energies.
Further on, the three-loop corrections exceed the uncertainty due to the
current experimental accuracy. In case of the the running bottom-quark mass,
they can reach in the large tan(beta) regime up to 30% of the tree-level value.
|
[
{
"created": "Tue, 28 Oct 2008 19:33:46 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Feb 2009 14:35:57 GMT",
"version": "v2"
}
] |
2010-04-15
|
[
[
"Bauer",
"A.",
""
],
[
"Mihaila",
"L.",
""
],
[
"Salomon",
"J.",
""
]
] |
We compute the exact two-loop matching coefficients for the strong coupling constant alpha_s and the bottom-quark mass m_b within the Minimal Supersymmetric Standard Model (MSSM), taking into account O(alpha_s^2) contributions from Supersymmetric Quantum Chromodynamics (SQCD). We find that the explicit mass pattern of the supersymmetric particles has a significant impact on the predictions of alpha_s and m_b at high energies. Further on, the three-loop corrections exceed the uncertainty due to the current experimental accuracy. In case of the the running bottom-quark mass, they can reach in the large tan(beta) regime up to 30% of the tree-level value.
|
2108.00253
|
Ngo Phuc Duc Loc
|
Ngo Phuc Duc Loc
|
Sphaleron bound in some nonstandard cosmology scenarios
|
16 pages, 6 figures, 1 table
|
Int. J. Mod. Phys. A 37, 2250153 (2022)
|
10.1142/S0217751X22501536
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
In the first scenario, we revise the upper bound of the cutoff scale of the
dimension-six potential Higgs operator required for a successful electroweak
baryogenesis in the case of a modified expansion history caused by the
existence of a non-interacting scalar field at the time phase transition
happens. The upper bound 860 GeV of the cutoff scale in the conventional case
can be improved to 1 TeV in the modified expansion case under certain
conditions. In the second scenario, we consider the Randall-Sundrum type II
model. We show that the lower bound of the five-dimensional Planck scale in
this model, which is determined from the validity of Newtonian gravitational
potential at small distance, turns out to be crucial in eliminating this model
as a viable candidate to satisfy the sphaleron bound; however, again modifying
the expansion history by including a non-interacting scalar field at the
electroweak scale can then make this model satisfy the sphaleron bound with a
certain parameter space.
|
[
{
"created": "Sat, 31 Jul 2021 14:41:40 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Aug 2021 22:39:00 GMT",
"version": "v2"
},
{
"created": "Fri, 11 Nov 2022 06:48:50 GMT",
"version": "v3"
}
] |
2022-11-14
|
[
[
"Loc",
"Ngo Phuc Duc",
""
]
] |
In the first scenario, we revise the upper bound of the cutoff scale of the dimension-six potential Higgs operator required for a successful electroweak baryogenesis in the case of a modified expansion history caused by the existence of a non-interacting scalar field at the time phase transition happens. The upper bound 860 GeV of the cutoff scale in the conventional case can be improved to 1 TeV in the modified expansion case under certain conditions. In the second scenario, we consider the Randall-Sundrum type II model. We show that the lower bound of the five-dimensional Planck scale in this model, which is determined from the validity of Newtonian gravitational potential at small distance, turns out to be crucial in eliminating this model as a viable candidate to satisfy the sphaleron bound; however, again modifying the expansion history by including a non-interacting scalar field at the electroweak scale can then make this model satisfy the sphaleron bound with a certain parameter space.
|
hep-ph/0309157
|
Hans Volker Klapdor-Kleingrothaus
|
H.V. Klapdor-Kleingrothaus (Spokesman of HEIDELBERG-MOSCOW and GENIUS
Collaborations), O. Chkvorez, I.V. Krivosheina and C. Tomei,
(Max-Planck-Institut fuer Kernphysik, Germany)
|
Measurement of the 214Bi spectrum in the energy region around the
Q-value of 76Ge neutrinoless double-beta decay
|
10 pages, latex2e, 5 figures, see also Home Page of HEIDELBERG
Non-Accelerator Particle Physics Group: http://www.mpi-hd.mpg.de/non_acc/
|
Nucl.Instrum.Meth. A511 (2003) 335-340
|
10.1016/S0168-9002(03)01927-2
| null |
hep-ph
| null |
In this work we present the results obtained measuring the 214Bi spectrum
from a 226Ra source with a high purity germanium detector. Our attention was
mostly focused on the energy region around the Q-value of 76Ge neutrinoless
double-beta decay (2039.006 keV). The results of this measurement are strongly
related to the first indication for the neutrinoless double beta decay of 76Ge,
given by a recent analysis \cite{Evidence,KK02-PN,KK02-Found,KK-BigArt02} of
the data collected during ten years of measurements from the HEIDELBERG-MOSCOW
experiment.
|
[
{
"created": "Sun, 14 Sep 2003 19:27:48 GMT",
"version": "v1"
}
] |
2009-11-10
|
[
[
"Klapdor-Kleingrothaus",
"H. V.",
"",
"Spokesman of HEIDELBERG-MOSCOW and GENIUS\n Collaborations"
],
[
"Chkvorez",
"O.",
""
],
[
"Krivosheina",
"I. V.",
""
],
[
"Tomei",
"C.",
""
]
] |
In this work we present the results obtained measuring the 214Bi spectrum from a 226Ra source with a high purity germanium detector. Our attention was mostly focused on the energy region around the Q-value of 76Ge neutrinoless double-beta decay (2039.006 keV). The results of this measurement are strongly related to the first indication for the neutrinoless double beta decay of 76Ge, given by a recent analysis \cite{Evidence,KK02-PN,KK02-Found,KK-BigArt02} of the data collected during ten years of measurements from the HEIDELBERG-MOSCOW experiment.
|
1712.02263
|
Ruben Sandapen
|
Mohammad Ahmady, Farrukh Chishtie and Ruben Sandapen
|
QCD-constrained dynamical spin effects in the pion holographic
light-front wavefunction
|
5 pages, Proceedings Contribution to the international conference,
Light-cone 2017, held at the University of Mumbai, India. September 18-22,
2017
| null |
10.1007/s00601-018-1337-3
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Using light-front holography, we predict simultaneously the pion decay
constant and the pion charge radius by taking into account (higher twist)
dynamical spin effects whose relative importance is constrained by QCD.
|
[
{
"created": "Wed, 6 Dec 2017 16:25:01 GMT",
"version": "v1"
}
] |
2018-04-04
|
[
[
"Ahmady",
"Mohammad",
""
],
[
"Chishtie",
"Farrukh",
""
],
[
"Sandapen",
"Ruben",
""
]
] |
Using light-front holography, we predict simultaneously the pion decay constant and the pion charge radius by taking into account (higher twist) dynamical spin effects whose relative importance is constrained by QCD.
|
1107.4252
|
Chuwen Xiao
|
Chu-Wen Xiao, Melahat Bayar and Eulogio Oset
|
Baryon bound states of three hadrons with charm and hidden charm
|
Proceeding of Hadron2011 in Munich
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this talk, we show our recent theoretical results for three-body systems
in the charm sector which are made of three hadrons and contain one nucleon,
one $D$ meson and in addition another meson, $\bar{D}$, $K$ or $\bar{K}$.
|
[
{
"created": "Thu, 21 Jul 2011 12:34:53 GMT",
"version": "v1"
}
] |
2011-07-22
|
[
[
"Xiao",
"Chu-Wen",
""
],
[
"Bayar",
"Melahat",
""
],
[
"Oset",
"Eulogio",
""
]
] |
In this talk, we show our recent theoretical results for three-body systems in the charm sector which are made of three hadrons and contain one nucleon, one $D$ meson and in addition another meson, $\bar{D}$, $K$ or $\bar{K}$.
|
hep-ph/0411348
|
V. A. Yerokhin
|
V. A. Yerokhin, P. Indelicato, and V. M. Shabaev
|
Two-loop self-energy contribution to the Lamb shift in H-like ions
| null |
Phys.Rev. A71 (2005) 040101
|
10.1103/PhysRevA.71.040101
| null |
hep-ph
| null |
The two-loop self-energy correction is evaluated to all orders in Z\alpha for
the ground-state Lamb shift of H-like ions with Z >= 10, where Z is the nuclear
charge number and \alpha is the fine structure constant. The results obtained
are compared with the analytical values for the Z\alpha-expansion coefficients.
An extrapolation of the all-order numerical results to Z=1 is presented and
implications of our calculation for the hydrogen Lamb shift are discussed.
|
[
{
"created": "Fri, 26 Nov 2004 17:07:03 GMT",
"version": "v1"
}
] |
2009-11-10
|
[
[
"Yerokhin",
"V. A.",
""
],
[
"Indelicato",
"P.",
""
],
[
"Shabaev",
"V. M.",
""
]
] |
The two-loop self-energy correction is evaluated to all orders in Z\alpha for the ground-state Lamb shift of H-like ions with Z >= 10, where Z is the nuclear charge number and \alpha is the fine structure constant. The results obtained are compared with the analytical values for the Z\alpha-expansion coefficients. An extrapolation of the all-order numerical results to Z=1 is presented and implications of our calculation for the hydrogen Lamb shift are discussed.
|
hep-ph/0511128
|
Bryan Webber
|
Bryan Webber
|
Black Holes at Accelerators
|
14 pages, 15 figures. Invited talk at SLAC Summer Institute 2005
(SSI05-T030). Version 3: minor changes to text and some references added
| null | null |
Cavendish-HEP-05/20
|
hep-ph
| null |
In theories with large extra dimensions and TeV-scale gravity, black holes
are copiously produced in particle collisions at energies well above the Planck
scale. I briefly review some recent work on the phenomenology of this process,
with emphasis on theoretical uncertainties and possible strategies for
measuring the number of extra dimensions.
|
[
{
"created": "Thu, 10 Nov 2005 15:46:57 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Nov 2005 14:28:57 GMT",
"version": "v2"
},
{
"created": "Thu, 6 Apr 2006 16:04:38 GMT",
"version": "v3"
}
] |
2007-05-23
|
[
[
"Webber",
"Bryan",
""
]
] |
In theories with large extra dimensions and TeV-scale gravity, black holes are copiously produced in particle collisions at energies well above the Planck scale. I briefly review some recent work on the phenomenology of this process, with emphasis on theoretical uncertainties and possible strategies for measuring the number of extra dimensions.
|
1307.7924
|
Zong-Gang Mou
|
Zong-Gang Mou, Paul M. Saffin, Anders Tranberg
|
Ensemble fermions for electroweak dynamics and the fermion preheating
temperature
|
19 pages, 10 figures
| null |
10.1007/JHEP11(2013)097
| null |
hep-ph hep-lat hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We refine the implementation of ensemble fermions for the electroweak sector
of the Standard Model, introduced previously. We consider the behavior of
different observables as the size of the ensemble is increased and show that
the dynamics converges for ensemble sizes small enough that simulations of the
entire electroweak sector become numerically tractable. We apply the method to
the computation of the effective preheating temperature during a fast
electroweak transition, relevant for Cold Electroweak Baryogenesis. We find
that this temperature is never below 20 GeV, and this in combination with the
early results convincingly rules out Standard Model CP-violation as the origin
of the baryon asymmetry of the Universe.
|
[
{
"created": "Tue, 30 Jul 2013 11:44:16 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Sep 2013 10:40:13 GMT",
"version": "v2"
}
] |
2015-06-16
|
[
[
"Mou",
"Zong-Gang",
""
],
[
"Saffin",
"Paul M.",
""
],
[
"Tranberg",
"Anders",
""
]
] |
We refine the implementation of ensemble fermions for the electroweak sector of the Standard Model, introduced previously. We consider the behavior of different observables as the size of the ensemble is increased and show that the dynamics converges for ensemble sizes small enough that simulations of the entire electroweak sector become numerically tractable. We apply the method to the computation of the effective preheating temperature during a fast electroweak transition, relevant for Cold Electroweak Baryogenesis. We find that this temperature is never below 20 GeV, and this in combination with the early results convincingly rules out Standard Model CP-violation as the origin of the baryon asymmetry of the Universe.
|
hep-ph/0203035
|
Chris Allton
|
Chris Allton
|
Lattice QCD with Dynamical Quarks from the UKQCD Collaboration
|
Invited paper presented at the International Light-Cone Workshop
"Light-cone Physics: Particles and Strings", September 2001, Trento, Italy. 7
pages
|
Nucl.Phys.Proc.Suppl. 108 (2002) 133-139
|
10.1016/S0920-5632(02)01316-6
|
SWAT/331
|
hep-ph hep-lat
| null |
A brief overview of the lattice technique of studying QCD is presented.
Recent results from the UKQCD Collaboration's simulations with dynamical quarks
are then presented. In this work, the calculations are all at a fixed lattice
spacing and volume, but varying sea quark mass from infinite (corresponding to
the quenched simulation) down to roughly that of the strange quark mass. The
main aim of this work is to uncover dynamical quark effects from these
``matched'' ensembles.
|
[
{
"created": "Tue, 5 Mar 2002 01:49:18 GMT",
"version": "v1"
}
] |
2009-11-07
|
[
[
"Allton",
"Chris",
""
]
] |
A brief overview of the lattice technique of studying QCD is presented. Recent results from the UKQCD Collaboration's simulations with dynamical quarks are then presented. In this work, the calculations are all at a fixed lattice spacing and volume, but varying sea quark mass from infinite (corresponding to the quenched simulation) down to roughly that of the strange quark mass. The main aim of this work is to uncover dynamical quark effects from these ``matched'' ensembles.
|
1103.3649
|
Peter Zeiler Skands
|
Holger Schulz and Peter Skands
|
Energy Scaling of Minimum-Bias Tunes
|
17 pages, 3 figures, 4 tables
| null |
10.1140/epjc/s10052-011-1644-z
|
MCNET-11-07, CERN-TH-2011-036, HU-EP-11/13
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We propose that the flexibility offered by modern event-generator tuning
tools allows for more than just obtaining "best fits" to a collection of data.
In particular, we argue that the universality of the underlying physics model
can be tested by performing several, mutually independent, optimizations of the
generator parameters in different physical regions. For regions in which these
optimizations return similar and self-consistent parameter values, the model
can be considered universal. Deviations from this behavior can be associated
with a breakdown of the modeling, with the nature of the deviations giving
clues as to the nature of the breakdown. We apply this procedure to study the
energy scaling of a class of minimum-bias models based on multiple parton
interactions (MPI) and pT-ordered showers, implemented in the Pythia 6.4
generator. We find that a parameter controlling the strength of color
reconnections in the final state is the most important source of
non-universality in this model.
|
[
{
"created": "Fri, 18 Mar 2011 15:14:01 GMT",
"version": "v1"
}
] |
2015-05-27
|
[
[
"Schulz",
"Holger",
""
],
[
"Skands",
"Peter",
""
]
] |
We propose that the flexibility offered by modern event-generator tuning tools allows for more than just obtaining "best fits" to a collection of data. In particular, we argue that the universality of the underlying physics model can be tested by performing several, mutually independent, optimizations of the generator parameters in different physical regions. For regions in which these optimizations return similar and self-consistent parameter values, the model can be considered universal. Deviations from this behavior can be associated with a breakdown of the modeling, with the nature of the deviations giving clues as to the nature of the breakdown. We apply this procedure to study the energy scaling of a class of minimum-bias models based on multiple parton interactions (MPI) and pT-ordered showers, implemented in the Pythia 6.4 generator. We find that a parameter controlling the strength of color reconnections in the final state is the most important source of non-universality in this model.
|
1512.07233
|
Marc Schlegel
|
Koichi Kanazawa, Yuji Koike, Andreas Metz, Daniel Pitonyak, Marc
Schlegel
|
Operator Constraints for Twist-3 Functions and Lorentz Invariance
Properties of Twist-3 Observables
|
17 pages, 6 figures, minor changes, final version, published in PRD
|
Phys. Rev. D 93, 054024 (2016)
|
10.1103/PhysRevD.93.054024
|
RBRC-1164
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the behavior under Lorentz tranformations of perturbative
coefficient functions in a collinear twist-3 formalism relevant for high-energy
observables including transverse polarization of hadrons. We argue that those
perturbative coefficient functions can, {\it a priori}, acquire quite different
yet Lorentz-invariant forms in various frames. This somewhat surprising
difference can be traced back to a general dependence of the perturbative
coefficient functions on lightcone vectors which are introduced by the twist-3
factorization formulae and which are frame-dependent. One can remove this
spurious frame dependence by invoking so-called Lorentz invariance relations
(LIRs) between twist-3 parton correlation functions. Some of those relations
for twist-3 distribution functions were discussed in the literature before. In
this paper we derive the corresponding LIRs for twist-3 fragmentation
functions. We explicitly demonstrate that these LIRs remove the lightcone
vector dependence by considering transverse spin observables in the
single-inclusive production of hadrons in lepton-nucleon collisions, $\ell N\to
hX$. With the LIRs in hand, we also show that twist-3 observables in general
can be written solely in terms of three-parton correlation functions.
|
[
{
"created": "Tue, 22 Dec 2015 20:32:48 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Mar 2016 11:02:38 GMT",
"version": "v2"
}
] |
2016-03-23
|
[
[
"Kanazawa",
"Koichi",
""
],
[
"Koike",
"Yuji",
""
],
[
"Metz",
"Andreas",
""
],
[
"Pitonyak",
"Daniel",
""
],
[
"Schlegel",
"Marc",
""
]
] |
We investigate the behavior under Lorentz tranformations of perturbative coefficient functions in a collinear twist-3 formalism relevant for high-energy observables including transverse polarization of hadrons. We argue that those perturbative coefficient functions can, {\it a priori}, acquire quite different yet Lorentz-invariant forms in various frames. This somewhat surprising difference can be traced back to a general dependence of the perturbative coefficient functions on lightcone vectors which are introduced by the twist-3 factorization formulae and which are frame-dependent. One can remove this spurious frame dependence by invoking so-called Lorentz invariance relations (LIRs) between twist-3 parton correlation functions. Some of those relations for twist-3 distribution functions were discussed in the literature before. In this paper we derive the corresponding LIRs for twist-3 fragmentation functions. We explicitly demonstrate that these LIRs remove the lightcone vector dependence by considering transverse spin observables in the single-inclusive production of hadrons in lepton-nucleon collisions, $\ell N\to hX$. With the LIRs in hand, we also show that twist-3 observables in general can be written solely in terms of three-parton correlation functions.
|
hep-ph/9909359
|
Robert Peschanski
|
R.Peschanski (SPhT,Saclay)
|
On the QCD dipole content of hard photon and gluon probes
|
Invited talk at the QCD Euroconference 99,Montpellier July 7-13,
1999; 5pages, 1 eps figure
|
Nucl.Phys.Proc.Suppl.86:170-174,2000
|
10.1016/S0920-5632(00)00559-4
|
t99/098
|
hep-ph
| null |
A gluon forward jet playing the role of a deep probe in high energy
scattering, we analyze its infinite momentum QCD wave function in terms of
dipole (color-singlet quark-antiquark) configurations using k_T-factorization
properties. The comparison is made with virtual photon quark-antiquark
configurations. Some implications for hard processes with forward jets at Hera
and Tevatron are suggested.
|
[
{
"created": "Tue, 14 Sep 1999 09:40:52 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Peschanski",
"R.",
"",
"SPhT,Saclay"
]
] |
A gluon forward jet playing the role of a deep probe in high energy scattering, we analyze its infinite momentum QCD wave function in terms of dipole (color-singlet quark-antiquark) configurations using k_T-factorization properties. The comparison is made with virtual photon quark-antiquark configurations. Some implications for hard processes with forward jets at Hera and Tevatron are suggested.
|
hep-ph/9709281
|
Arnd Brandenburg
|
W. Bernreuther, A. Brandenburg, and P. Uwer (RWTH Aachen)
|
Next-to-Leading Order QCD corrections to Three-Jet Rates with Massive
Quarks
|
4 pages, LaTeX, 2 postscript figures, uses espcrc2.sty. Talk given by
W. Bernreuther at the workshop on Standard Model Physics, San Miniato, April
1997
|
Nucl.Phys.Proc.Suppl.65:39-42,1998
|
10.1016/S0920-5632(97)00973-0
|
PITHA 97/35
|
hep-ph
| null |
The reaction $e^+e^-$ annihilation into three jets was recently computed for
massive quarks at next-to-leading order in perturbative QCD. We discuss some
results of our calculation for b jets produced at the Z resonance.
|
[
{
"created": "Mon, 8 Sep 1997 13:29:54 GMT",
"version": "v1"
}
] |
2011-01-25
|
[
[
"Bernreuther",
"W.",
"",
"RWTH Aachen"
],
[
"Brandenburg",
"A.",
"",
"RWTH Aachen"
],
[
"Uwer",
"P.",
"",
"RWTH Aachen"
]
] |
The reaction $e^+e^-$ annihilation into three jets was recently computed for massive quarks at next-to-leading order in perturbative QCD. We discuss some results of our calculation for b jets produced at the Z resonance.
|
0711.1468
|
Ruben Concei\c{c}\~ao
|
J. Alvarez-Muniz, R. Conceicao, J. Dias de Deus, M.C. Espirito Santo,
J. G. Milhano, M. Pimenta
|
Net-Baryon Physics: Basic Mechanisms
| null | null | null | null |
hep-ph
| null |
It is well known that, in nuclear collisions, a sizable fraction of the
available energy is carried away by baryons. As the baryon number is conserved,
the net-baryon $B-\bar{B}$ retains information on the energy-momentum carried
by the incoming nuclei. A simple but consistent model for net-baryon production
in high energy hadron-hadron, hadron-nucleus and nucleus-nucleus collisions is
presented. The basic ingredients of the model are valence string formation
based on standard PDFs with QCD evolution and string fragmentation via the
Schwinger mechanism. The results of the model are presented and compared with
both data and existing models. These results show that a good description of
the main features of net-baryon data is possible on the framework of a
simplistic model, with the advantage of making the fundamental production
mechanisms manifest.
|
[
{
"created": "Fri, 9 Nov 2007 14:29:23 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Nov 2007 11:15:08 GMT",
"version": "v2"
}
] |
2007-11-12
|
[
[
"Alvarez-Muniz",
"J.",
""
],
[
"Conceicao",
"R.",
""
],
[
"de Deus",
"J. Dias",
""
],
[
"Santo",
"M. C. Espirito",
""
],
[
"Milhano",
"J. G.",
""
],
[
"Pimenta",
"M.",
""
]
] |
It is well known that, in nuclear collisions, a sizable fraction of the available energy is carried away by baryons. As the baryon number is conserved, the net-baryon $B-\bar{B}$ retains information on the energy-momentum carried by the incoming nuclei. A simple but consistent model for net-baryon production in high energy hadron-hadron, hadron-nucleus and nucleus-nucleus collisions is presented. The basic ingredients of the model are valence string formation based on standard PDFs with QCD evolution and string fragmentation via the Schwinger mechanism. The results of the model are presented and compared with both data and existing models. These results show that a good description of the main features of net-baryon data is possible on the framework of a simplistic model, with the advantage of making the fundamental production mechanisms manifest.
|
0709.0351
|
Thomas Gehrmann
|
T. Gehrmann
|
Tools for NNLO QCD Calculations
|
8 pages, LaTeX, to appear in the proceedings of the International
Linear Collider Workshop LCWS07, Hamburg, 2007
|
ECONF C0705302:LOOP05,2007
| null |
ZU-TH 22/07
|
hep-ph
| null |
For precision studies with QCD observables at colliders, higher order
perturbative corrections are often mandatory. For exclusive observables, like
jet cross sections or differential distributions, these corrections were until
recently only known to next-to-leading order (NLO) in perturbation theory.
Owing to many new technical developments, first next-to-next-to-leading order
(NNLO) QCD calculations are now becoming available. We review the recent
progress in this field.
|
[
{
"created": "Tue, 4 Sep 2007 07:53:04 GMT",
"version": "v1"
}
] |
2008-12-30
|
[
[
"Gehrmann",
"T.",
""
]
] |
For precision studies with QCD observables at colliders, higher order perturbative corrections are often mandatory. For exclusive observables, like jet cross sections or differential distributions, these corrections were until recently only known to next-to-leading order (NLO) in perturbation theory. Owing to many new technical developments, first next-to-next-to-leading order (NNLO) QCD calculations are now becoming available. We review the recent progress in this field.
|
1506.02443
|
Miloslav Svec
|
Miloslav Svec
|
Consistency of pipi phase shift analyses with rho^0(770)-f_0(980) spin
mixing in pi(-)p->pi(-)pi(+)n
|
29 pages, 20 figures, labels in Figure 2 corrected
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We have performed two analytical pipi phase shift analyses using a Standard
amplitude analysis of the CERN data on pi(-)p->pi(-)pi(+)n on polarized target
at 17.2 GeV/c and a more recent analysis of the same data using Spin Mixing
Mechanism (SMM). There are two solutions for helicity amplitudes labeled (1,1)
and (2,2) in the Standard analysis and SpinMixing and S-Matrix in the SMM
analysis which are related to the pipi scattering amplitudes. Our first phase
shift analysis is an elastic scattering analysis below KKbar threshold. Our
second analysis is a joint pipi phase shift analysis of pi(-)pi(+) and
pi(0)pi(0) data below 1080 MeV. Our elastic Solution (2,2)1 and elastic
Solution SpinMixing 1 for delta^0_S are in a remarkable agreement with the 1997
Cracow Solution Down-flat using the same CERN data on polarized target. Our
joint Solution (2,2) and joint Solution SpinMixing are also in a remarkable
agreement with the 2002 joint Cracow Solution Down-flat. Solutions elastic
(1,1) and joint (1,1) agree with the Cracow Solutions Up-flat and are rejected.
Model independent amplitude analyses of measurements of pi(-)p->pi(-)pi(+)n at
17.2 and 1.78 GeV/c and pi(+)n->pi(+)pi(-)p at 5.98 and 11.85 GeV/c reveal
evidence for rho^0(770)-f_0(980) spin mixing in the S-wave transversity
amplitudes. These transversity amplitudes define single-flip helicity
amplitudes which have been related to pipi scattering amplitudes. Our key
observation is that the presented and the Cracow solutions are consistent with
the evidence for rho^0(770)-f_0(980) spin mixing in the measured transversity
amplitudes from which all these phase shifts ultimately arise.
|
[
{
"created": "Mon, 8 Jun 2015 11:29:49 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Jun 2015 12:07:03 GMT",
"version": "v2"
}
] |
2015-06-26
|
[
[
"Svec",
"Miloslav",
""
]
] |
We have performed two analytical pipi phase shift analyses using a Standard amplitude analysis of the CERN data on pi(-)p->pi(-)pi(+)n on polarized target at 17.2 GeV/c and a more recent analysis of the same data using Spin Mixing Mechanism (SMM). There are two solutions for helicity amplitudes labeled (1,1) and (2,2) in the Standard analysis and SpinMixing and S-Matrix in the SMM analysis which are related to the pipi scattering amplitudes. Our first phase shift analysis is an elastic scattering analysis below KKbar threshold. Our second analysis is a joint pipi phase shift analysis of pi(-)pi(+) and pi(0)pi(0) data below 1080 MeV. Our elastic Solution (2,2)1 and elastic Solution SpinMixing 1 for delta^0_S are in a remarkable agreement with the 1997 Cracow Solution Down-flat using the same CERN data on polarized target. Our joint Solution (2,2) and joint Solution SpinMixing are also in a remarkable agreement with the 2002 joint Cracow Solution Down-flat. Solutions elastic (1,1) and joint (1,1) agree with the Cracow Solutions Up-flat and are rejected. Model independent amplitude analyses of measurements of pi(-)p->pi(-)pi(+)n at 17.2 and 1.78 GeV/c and pi(+)n->pi(+)pi(-)p at 5.98 and 11.85 GeV/c reveal evidence for rho^0(770)-f_0(980) spin mixing in the S-wave transversity amplitudes. These transversity amplitudes define single-flip helicity amplitudes which have been related to pipi scattering amplitudes. Our key observation is that the presented and the Cracow solutions are consistent with the evidence for rho^0(770)-f_0(980) spin mixing in the measured transversity amplitudes from which all these phase shifts ultimately arise.
|
1002.4215
|
Richard Hill
|
Richard J. Hill
|
On the single photon background to nu_e appearance at MiniBooNE
|
5 pages, 5 figures
|
Phys.Rev.D84:017501,2011
|
10.1103/PhysRevD.84.017501
|
EFI Preprint 10-3
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Neglected single photon processes are fit to an excess of electron-like
events observed in a predominantly nu_mu beam at MiniBooNE. Predictions are
given for analogous events in antineutrino mode.
|
[
{
"created": "Mon, 22 Feb 2010 23:49:26 GMT",
"version": "v1"
}
] |
2011-08-08
|
[
[
"Hill",
"Richard J.",
""
]
] |
Neglected single photon processes are fit to an excess of electron-like events observed in a predominantly nu_mu beam at MiniBooNE. Predictions are given for analogous events in antineutrino mode.
|
2312.07923
|
Yuhua Yao
|
Xu-Lin Dong, Yu-Hua Yao, Yi-Qing Guo, Shu-Wang Cui
|
A new understanding of nuclei spectra properties with propagation model
|
8 pages, 8 figures. accepted by PRD
| null | null | null |
hep-ph astro-ph.HE
|
http://creativecommons.org/licenses/by-nc-sa/4.0/
|
The AMS-02 experiment has observed new properties of primary cosmic rays
(CRs) categorized into two groups: He-C-O-Fe and Ne-Mg-Si-S, which are
independent of CR propagation. In this study, we investigate the unexpected
properties of these nuclei using a spatial propagation model. All nuclei
spectra are accurately reproduced and separated into primary and secondary
contributions. Our findings include: 1. Primary CR spectra are identical. 2.
Our calculations align with AMS-02 results for primary-dominated nuclei within
a 10\% difference, but show significant discrepancies for the
secondary-dominated nuclei. 3. The primary element abundance is presented for
the first time. We anticipate that the DAMPE and future HERD experiments will
provide observations of nuclei spectra above TeV energy.
|
[
{
"created": "Wed, 13 Dec 2023 06:43:41 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Mar 2024 09:40:18 GMT",
"version": "v2"
}
] |
2024-03-08
|
[
[
"Dong",
"Xu-Lin",
""
],
[
"Yao",
"Yu-Hua",
""
],
[
"Guo",
"Yi-Qing",
""
],
[
"Cui",
"Shu-Wang",
""
]
] |
The AMS-02 experiment has observed new properties of primary cosmic rays (CRs) categorized into two groups: He-C-O-Fe and Ne-Mg-Si-S, which are independent of CR propagation. In this study, we investigate the unexpected properties of these nuclei using a spatial propagation model. All nuclei spectra are accurately reproduced and separated into primary and secondary contributions. Our findings include: 1. Primary CR spectra are identical. 2. Our calculations align with AMS-02 results for primary-dominated nuclei within a 10\% difference, but show significant discrepancies for the secondary-dominated nuclei. 3. The primary element abundance is presented for the first time. We anticipate that the DAMPE and future HERD experiments will provide observations of nuclei spectra above TeV energy.
|
0807.2211
|
Slava Khruschev
|
S. A. Kononogov, V. N. Melnikov, V. V. Khruschov
|
Constants of extended Standard Model and search for their temporal
variations
|
15 pages
|
Grav.Cosmol.15:158-163,2009
|
10.1134/S020228930902011X
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Some methods for the determination and the most precise values of constants
of an extended Standard Model, which include the gravitation interaction and
massive neutrinos, are presented. Accuracies of constants at different energy
scales are compared and the possible manifestations of temporal variations of
constants are considered. Theoretical estimations and obtained experimental
bounds of variations are listed, that is important as for search of SM
generalizations as to account for possible influence on metrological
characteristics of measurement standards.
|
[
{
"created": "Mon, 14 Jul 2008 17:21:28 GMT",
"version": "v1"
}
] |
2010-04-30
|
[
[
"Kononogov",
"S. A.",
""
],
[
"Melnikov",
"V. N.",
""
],
[
"Khruschov",
"V. V.",
""
]
] |
Some methods for the determination and the most precise values of constants of an extended Standard Model, which include the gravitation interaction and massive neutrinos, are presented. Accuracies of constants at different energy scales are compared and the possible manifestations of temporal variations of constants are considered. Theoretical estimations and obtained experimental bounds of variations are listed, that is important as for search of SM generalizations as to account for possible influence on metrological characteristics of measurement standards.
|
hep-ph/9505225
| null |
Bernd A. Kniehl (FNAL) and M. Spira (University of Hamburg)
|
Low-Energy Theorems in Higgs Physics
|
24 pages, latex, no figures
|
Z.Phys. C69 (1995) 77-88
| null |
DESY 95-041, FERMILAB-PUB-95/081-T, MPI/PhT/95--21
|
hep-ph
| null |
We present low-energy theorems for the calculation of loop amplitudes with
external scalar or pseudoscalar Higgs bosons which are light compared to the
loop particles. Starting from existing lowest-order versions of these theorems,
we show how their applicability may be extended to the two--loop level. To
illustrate the usefulness of these theorems, we discuss a number of
applications to Higgs production and decay at and beyond the one--loop order.
|
[
{
"created": "Wed, 3 May 1995 19:09:26 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Kniehl",
"Bernd A.",
"",
"FNAL"
],
[
"Spira",
"M.",
"",
"University of Hamburg"
]
] |
We present low-energy theorems for the calculation of loop amplitudes with external scalar or pseudoscalar Higgs bosons which are light compared to the loop particles. Starting from existing lowest-order versions of these theorems, we show how their applicability may be extended to the two--loop level. To illustrate the usefulness of these theorems, we discuss a number of applications to Higgs production and decay at and beyond the one--loop order.
|
1812.07424
|
Adil Jueid
|
Simone Amoroso, Sascha Caron, Adil Jueid, Roberto Ruiz de Austri,
Peter Skands
|
Estimating QCD uncertainties in Monte Carlo event generators for
gamma-ray dark matter searches
|
Tables for the particle spectra with their uncertainties can be found
in https://zenodo.org/record/3764809#.XqvK0y-cZQJ; Discussion slightly
improved, and some references are added. Comments are welcome!
|
JCAP 1905 (2019) 007
|
10.1088/1475-7516/2019/05/007
| null |
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Motivated by the recent galactic center gamma-ray excess identified in the
Fermi-LAT data, we perform a detailed study of QCD fragmentation uncertainties
in the modeling of the energy spectra of gamma-rays from Dark-Matter (DM)
annihilation. When Dark-Matter particles annihilate to coloured final states,
either directly or via decays such as $W^{(*)}\to q\bar{q}'$, photons are
produced from a complex sequence of shower, hadronisation and hadron decays. In
phenomenological studies, their energy spectra are typically computed using
Monte Carlo event generators. These results have however intrinsic
uncertainties due to the specific model used and the choice of model
parameters, which are difficult to asses and which are typically neglected. We
derive a new set of hadronisation parameters (tunes) for the
\textsc{Pythia~8.2} Monte Carlo generator from a fit to LEP and SLD data at the
$Z$ peak. For the first time, we also derive a conservative set of
uncertainties on the shower and hadronisation model parameters. Their impact on
the gamma-ray energy spectra is evaluated and discussed for a range of DM
masses and annihilation channels. The spectra and their uncertainties are also
provided in tabulated form for future use. The fragmentation-parameter
uncertainties may be useful for collider studies as well.
|
[
{
"created": "Tue, 18 Dec 2018 15:10:09 GMT",
"version": "v1"
},
{
"created": "Sun, 27 Oct 2019 15:26:34 GMT",
"version": "v2"
},
{
"created": "Fri, 1 May 2020 07:47:13 GMT",
"version": "v3"
}
] |
2020-05-04
|
[
[
"Amoroso",
"Simone",
""
],
[
"Caron",
"Sascha",
""
],
[
"Jueid",
"Adil",
""
],
[
"de Austri",
"Roberto Ruiz",
""
],
[
"Skands",
"Peter",
""
]
] |
Motivated by the recent galactic center gamma-ray excess identified in the Fermi-LAT data, we perform a detailed study of QCD fragmentation uncertainties in the modeling of the energy spectra of gamma-rays from Dark-Matter (DM) annihilation. When Dark-Matter particles annihilate to coloured final states, either directly or via decays such as $W^{(*)}\to q\bar{q}'$, photons are produced from a complex sequence of shower, hadronisation and hadron decays. In phenomenological studies, their energy spectra are typically computed using Monte Carlo event generators. These results have however intrinsic uncertainties due to the specific model used and the choice of model parameters, which are difficult to asses and which are typically neglected. We derive a new set of hadronisation parameters (tunes) for the \textsc{Pythia~8.2} Monte Carlo generator from a fit to LEP and SLD data at the $Z$ peak. For the first time, we also derive a conservative set of uncertainties on the shower and hadronisation model parameters. Their impact on the gamma-ray energy spectra is evaluated and discussed for a range of DM masses and annihilation channels. The spectra and their uncertainties are also provided in tabulated form for future use. The fragmentation-parameter uncertainties may be useful for collider studies as well.
|
hep-ph/9309288
|
Miriam Leurer
|
Miriam Leurer (Weizmann Institute)
|
New Bounds on Leptoquarks
|
6 Pages (LaTeX), including 3 uufiled postscript figures.
WIS-93/89/Sept-PH. (Contributed talk at the 5th International Symposium on
Heavy Flavour Physics, McGill University, July 6-10, 1993.)
| null | null | null |
hep-ph
| null |
We show that FCNC processes are unavoidable for leptoquarks that couple to
left handed quarks, and derive new FCNC bounds from neutral meson mixing.
Despite being induced only at one loop, these processes lead to significant
bounds since the leptoquark contributions do not suffer from GIM cancellations.
Studying the implications of these bounds we find that (i) The D-Dbar mixing
bound is the first significant FCNC bound from the up sector. Combining it with
FCNC bounds from the down sector we arrive at a bound on the first generation
couplings. (ii) The K-Kbar and D-Dbar mixings bound g^2/M while all other
processes bound g/M. The combined neutral meson mixing bound is therefore
dominant for the heavier leptoquarks, and leads to exclusion of large regions
in parameter space which were previously allowed.
|
[
{
"created": "Sun, 19 Sep 1993 17:10:45 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Leurer",
"Miriam",
"",
"Weizmann Institute"
]
] |
We show that FCNC processes are unavoidable for leptoquarks that couple to left handed quarks, and derive new FCNC bounds from neutral meson mixing. Despite being induced only at one loop, these processes lead to significant bounds since the leptoquark contributions do not suffer from GIM cancellations. Studying the implications of these bounds we find that (i) The D-Dbar mixing bound is the first significant FCNC bound from the up sector. Combining it with FCNC bounds from the down sector we arrive at a bound on the first generation couplings. (ii) The K-Kbar and D-Dbar mixings bound g^2/M while all other processes bound g/M. The combined neutral meson mixing bound is therefore dominant for the heavier leptoquarks, and leads to exclusion of large regions in parameter space which were previously allowed.
|
hep-ph/0307384
|
Michael Klasen
|
M. Klasen, B.A. Kniehl
|
Heavy Quarkonium Production with Polarized Hadrons and Photons
|
6 pages, 3 figures, contribution to DIS03
| null | null | null |
hep-ph
| null |
We investigate the inclusive production of prompt J/psi mesons in polarized
hadron-hadron and photon-hadron collisions in the factorization formalism of
NRQCD. Numerical results are presented for BNL RHIC-Spin and the approved SLAC
fixed-target experiment E161 to assess the feasibility to access the
spin-dependent parton distributions in the polarized proton and photon. We
point out that data on J/psi production taken by the PHENIX Collaboration in
unpolarized proton-proton collisions at RHIC tend to favor the NRQCD
factorization hypothesis, while they significantly overshoot the theoretical
prediction of the CSM.
|
[
{
"created": "Thu, 31 Jul 2003 07:38:50 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Klasen",
"M.",
""
],
[
"Kniehl",
"B. A.",
""
]
] |
We investigate the inclusive production of prompt J/psi mesons in polarized hadron-hadron and photon-hadron collisions in the factorization formalism of NRQCD. Numerical results are presented for BNL RHIC-Spin and the approved SLAC fixed-target experiment E161 to assess the feasibility to access the spin-dependent parton distributions in the polarized proton and photon. We point out that data on J/psi production taken by the PHENIX Collaboration in unpolarized proton-proton collisions at RHIC tend to favor the NRQCD factorization hypothesis, while they significantly overshoot the theoretical prediction of the CSM.
|
hep-ph/9402302
|
Jim Ohnemus
|
J. Ohnemus, T.F. Walsh, and P.M. Zerwas
|
$\gamma \gamma$ Production of Non--Strongly Interacting SUSY Particles
at Hadron Colliders
|
6 pages plus 2 postscript figures appended as uuencoded compressed
tar file, DESY 93--173, UCD--93--39
|
Phys.Lett. B328 (1994) 369-373
|
10.1016/0370-2693(94)91492-3
| null |
hep-ph
| null |
Non--strongly interacting supersymmetric particles -- sleptons, charginos,
neutral\-inos, and charged Higgs bosons -- are difficult to detect at the Large
Hadron Collider. We therefore examine the possibility of producing particles of
this type in virtual $\gamma \gamma$ collisions at the LHC. Since photons can
be emitted from protons which do not break up in the radiation process, very
clean events can be generated, compensating to some extent for the small event
numbers. Higher rates are expected, at the expense of stray hadrons, for events
in which one or two protons break up.
|
[
{
"created": "Wed, 16 Feb 1994 20:16:31 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Ohnemus",
"J.",
""
],
[
"Walsh",
"T. F.",
""
],
[
"Zerwas",
"P. M.",
""
]
] |
Non--strongly interacting supersymmetric particles -- sleptons, charginos, neutral\-inos, and charged Higgs bosons -- are difficult to detect at the Large Hadron Collider. We therefore examine the possibility of producing particles of this type in virtual $\gamma \gamma$ collisions at the LHC. Since photons can be emitted from protons which do not break up in the radiation process, very clean events can be generated, compensating to some extent for the small event numbers. Higher rates are expected, at the expense of stray hadrons, for events in which one or two protons break up.
|
hep-ph/9805333
|
Yamaguchi Masahide
|
Masahide Yamaguchi and Jun'ichi Yokoyama
|
Probability Distribution Function of the Coarse-grained Scalar Field at
Finite Temperature
|
15 pages, uuencode, gzipped tar file including LaTeX text and 4
postscript figures. Nuclear Physics B, in press
|
Nucl.Phys. B523 (1998) 363-376
|
10.1016/S0550-3213(98)00100-X
|
UTAP-281, YITP-97-55
|
hep-ph astro-ph
| null |
We present a formalism to calculate the probability distribution function of
a scalar field coarse-grained over some spatial scales with a Gaussian filter
at finite temperature. As an application, we investigate the role of
subcritical fluctuations in the electroweak phase transition in the minimal
standard model. It is concluded that the universe was in a mixed state of true
and false vacua already at the critical temperature.
|
[
{
"created": "Fri, 15 May 1998 05:56:52 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Yamaguchi",
"Masahide",
""
],
[
"Yokoyama",
"Jun'ichi",
""
]
] |
We present a formalism to calculate the probability distribution function of a scalar field coarse-grained over some spatial scales with a Gaussian filter at finite temperature. As an application, we investigate the role of subcritical fluctuations in the electroweak phase transition in the minimal standard model. It is concluded that the universe was in a mixed state of true and false vacua already at the critical temperature.
|
hep-ph/0602072
|
BingAn Li
|
Bing An Li (Univ. of Kentucky)
|
Production of a Q^2\bar{Q}^2 state in J/\psi\to \gamma\omega\phi
|
13 pages
|
Phys.Rev.D74:054017,2006
|
10.1103/PhysRevD.74.054017
| null |
hep-ph
| null |
The resonance X(1810) discovered in $J/\psi\to \gamma\omega\phi$ by BESII is
considered as a candidate of $0^{++}$ $Q^2\bar{Q}^2$ state. This model predicts
that $X\to\omega\phi, K^* K^*$ are the two dominant decay channels and $X\to
KK, \eta\eta, \eta\eta'$ are suppressed. The cross sections of $\gamma\gamma\to
X\to \omega\phi, K^* K^*$ are estimated.
|
[
{
"created": "Wed, 8 Feb 2006 15:50:56 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Feb 2006 13:37:36 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Li",
"Bing An",
"",
"Univ. of Kentucky"
]
] |
The resonance X(1810) discovered in $J/\psi\to \gamma\omega\phi$ by BESII is considered as a candidate of $0^{++}$ $Q^2\bar{Q}^2$ state. This model predicts that $X\to\omega\phi, K^* K^*$ are the two dominant decay channels and $X\to KK, \eta\eta, \eta\eta'$ are suppressed. The cross sections of $\gamma\gamma\to X\to \omega\phi, K^* K^*$ are estimated.
|
1102.0013
|
Rizwan Khalid
|
Ilia Gogoladze, Rizwan Khalid, Shabbar Raza and Qaisar Shafi
|
Higgs and Sparticle Spectroscopy with Gauge-Yukawa Unification
|
23 pages, 10 figures, 1 table; Typos fixed in section 4
|
JHEP 1106:117,2011
|
10.1007/JHEP06(2011)117
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We explore the Higgs and sparticle spectroscopy of supersymmetric SU(4)_c x
SU(2)_L x SU(2)_R models in which the three MSSM gauge couplings and third
family (t-b-tau) Yukawa couplings are all unified at M_GUT. This class of
models can be obtained via compactification of a higher dimensional theory.
Allowing for opposite sign gaugino masses and varying m_t within 1 sigma of its
current central value yields a variety of gauge-Yukawa unification as well as
WMAP compatible neutralino dark matter solutions. They include mixed
bino-Higgsino dark matter, stau and gluino coannihilation scenarios, and the
A-resonance solution.
|
[
{
"created": "Mon, 31 Jan 2011 21:12:32 GMT",
"version": "v1"
},
{
"created": "Sat, 3 Mar 2012 06:16:38 GMT",
"version": "v2"
}
] |
2012-03-06
|
[
[
"Gogoladze",
"Ilia",
""
],
[
"Khalid",
"Rizwan",
""
],
[
"Raza",
"Shabbar",
""
],
[
"Shafi",
"Qaisar",
""
]
] |
We explore the Higgs and sparticle spectroscopy of supersymmetric SU(4)_c x SU(2)_L x SU(2)_R models in which the three MSSM gauge couplings and third family (t-b-tau) Yukawa couplings are all unified at M_GUT. This class of models can be obtained via compactification of a higher dimensional theory. Allowing for opposite sign gaugino masses and varying m_t within 1 sigma of its current central value yields a variety of gauge-Yukawa unification as well as WMAP compatible neutralino dark matter solutions. They include mixed bino-Higgsino dark matter, stau and gluino coannihilation scenarios, and the A-resonance solution.
|
1509.00050
|
Susan Gardner
|
S. Gardner, R. J. Holt, A. S. Tadepalli
|
New Prospects in Fixed Target Searches for Dark Forces with the SeaQuest
Experiment at Fermilab
|
14 pages, 8 figures; improved sensitivity analysis and cross-checks;
small shifts in the expected limits; conclusions unchanged; refs. added
|
Phys. Rev. D 93, 115015 (2016)
|
10.1103/PhysRevD.93.115015
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
An intense, 120 GeV proton beam incident on an extremely long, iron target
generates enormous numbers of light-mass particles that also decay within that
target. If one of these particles decays to a final state with a hidden gauge
boson, or if such a particle is produced as a result of the initial collision,
then that weakly interacting, hidden-sector particle may traverse the remainder
of the target and be detected downstream through its possible decay to an
$e^+e^-$, $\mu^+\mu^-$, or $\pi^+\pi^-$ final state. These conditions can be
realized through an extension of the SeaQuest experiment at Fermilab, and in
this initial investigation we consider how it can serve as an ultrasensitive
probe of hidden vector gauge forces, both Abelian and non-Abelian. A light,
weakly coupled hidden sector may well explain the dark matter established
through astrophysical observations, and the proposed search can provide
tangible evidence for its existence --- or, alternatively, constrain a "sea" of
possibilities.
|
[
{
"created": "Mon, 31 Aug 2015 20:28:21 GMT",
"version": "v1"
},
{
"created": "Sun, 13 Mar 2016 02:15:32 GMT",
"version": "v2"
}
] |
2016-06-15
|
[
[
"Gardner",
"S.",
""
],
[
"Holt",
"R. J.",
""
],
[
"Tadepalli",
"A. S.",
""
]
] |
An intense, 120 GeV proton beam incident on an extremely long, iron target generates enormous numbers of light-mass particles that also decay within that target. If one of these particles decays to a final state with a hidden gauge boson, or if such a particle is produced as a result of the initial collision, then that weakly interacting, hidden-sector particle may traverse the remainder of the target and be detected downstream through its possible decay to an $e^+e^-$, $\mu^+\mu^-$, or $\pi^+\pi^-$ final state. These conditions can be realized through an extension of the SeaQuest experiment at Fermilab, and in this initial investigation we consider how it can serve as an ultrasensitive probe of hidden vector gauge forces, both Abelian and non-Abelian. A light, weakly coupled hidden sector may well explain the dark matter established through astrophysical observations, and the proposed search can provide tangible evidence for its existence --- or, alternatively, constrain a "sea" of possibilities.
|
2002.11077
|
Elena Santopinto
|
C. Becchi, A. Giachino, L. Maiani, E. Santopinto
|
Search for $bb\bar{b}\bar{b}$ tetraquark decays in 4 muons, $B^{+}
B^{-}$, $B^0 \bar{B}^0$ and $B_s^0 \bar{B}_s^0$ channels at LHC
|
11 pages, 1 figure
| null |
10.1016/j.physletb.2020.135495
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We perform a quantitative analysis of the $bb\bar{b}\bar{b}$ tetraquark
decays into hidden- and open-bottom mesons and calculate, for the first time,
the $bb\bar{b}\bar{b}$ tetraquark total decay width. On the basis of our
results, we propose the $bb\bar{b}\bar{b} \to B^{+} B^{-} (B^0 \bar{B}^0)
(B_s^0 \bar{B}_s^0) \to l^{+} l^{-}+\text{X}$ decays as the most suitable
channels to observe the $bb\bar{b}\bar{b}$ tetraquark states, since the
calculated two-lepton cross section upper limit, $\simeq 39 $ fb, is so large
as to be potentially detectable with the 2018 LHCb sensitivity,
paving the way to the observation of the $bb\bar{b}\bar{b}$ tetraquark in the
future LHCb upgrade. The $4\mu$ signal for the ground state, $J^{PC}=0^{++}$,
is likely to be too small even for the upgraded LHCb, but it may not be
hopeless for the $J^{PC}=2^{++}$ fully-bottom state.
|
[
{
"created": "Tue, 25 Feb 2020 18:13:18 GMT",
"version": "v1"
}
] |
2020-06-24
|
[
[
"Becchi",
"C.",
""
],
[
"Giachino",
"A.",
""
],
[
"Maiani",
"L.",
""
],
[
"Santopinto",
"E.",
""
]
] |
We perform a quantitative analysis of the $bb\bar{b}\bar{b}$ tetraquark decays into hidden- and open-bottom mesons and calculate, for the first time, the $bb\bar{b}\bar{b}$ tetraquark total decay width. On the basis of our results, we propose the $bb\bar{b}\bar{b} \to B^{+} B^{-} (B^0 \bar{B}^0) (B_s^0 \bar{B}_s^0) \to l^{+} l^{-}+\text{X}$ decays as the most suitable channels to observe the $bb\bar{b}\bar{b}$ tetraquark states, since the calculated two-lepton cross section upper limit, $\simeq 39 $ fb, is so large as to be potentially detectable with the 2018 LHCb sensitivity, paving the way to the observation of the $bb\bar{b}\bar{b}$ tetraquark in the future LHCb upgrade. The $4\mu$ signal for the ground state, $J^{PC}=0^{++}$, is likely to be too small even for the upgraded LHCb, but it may not be hopeless for the $J^{PC}=2^{++}$ fully-bottom state.
|
1207.1541
|
Roshan Foadi
|
Roshan Foadi and Francesco Sannino
|
S and T Parameters from a Light Nonstandard Higgs versus Near Conformal
Dynamics
|
13 pages, 3 figures
| null |
10.1103/PhysRevD.87.015008
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We determine the contribution to the $S$ and $T$ parameters coming from
extensions of the standard model featuring a light nonstandard-like Higgs
particle. We neatly separate, using the Landau gauge, the contribution from the
purely nonstandard Higgs sector, from the one due to the interplay of this
sector with the standard model. If the nonstandard Higgs sector derives from a
new type of near conformal dynamics, the formalism allows to precisely link the
intrinsic underlying contribution with the experimentally relevant parameters.
|
[
{
"created": "Fri, 6 Jul 2012 07:39:23 GMT",
"version": "v1"
}
] |
2013-05-30
|
[
[
"Foadi",
"Roshan",
""
],
[
"Sannino",
"Francesco",
""
]
] |
We determine the contribution to the $S$ and $T$ parameters coming from extensions of the standard model featuring a light nonstandard-like Higgs particle. We neatly separate, using the Landau gauge, the contribution from the purely nonstandard Higgs sector, from the one due to the interplay of this sector with the standard model. If the nonstandard Higgs sector derives from a new type of near conformal dynamics, the formalism allows to precisely link the intrinsic underlying contribution with the experimentally relevant parameters.
|
hep-ph/0111161
|
E. D. M. Kavoussanaki
|
E.D.M. Kavoussanaki
|
On Topological Defects
|
5 pages
| null | null | null |
hep-ph
| null |
The language and methods of algebraic topology, particularly homotopy theory,
have been extensively used in the study of the identification, the
classification and the evolution of defects. Topological methods provide the
means for the detection of gross features, such as holes in a manifold, and
therefore one would clearly anticipate that the defects, if identifiable by
such means, to be linked with that kind of configurations. In physical media,
however, defects usually manifest themselves in ways which have no distinct and
direct association with patterns of topological value along the lines of our
previous reference. In this paper we will postulate that the defects do not
themselves correspond to topological features. Instead, they are forced to
exist in order to redress the violation of physical rules happening as a result
of the topological nature of our system. We will, thus, assume that the
topology of our system changes with the introduction of defects. Therefore, the
relevent to our study topological methods will be applied to a well defined
physical system only in the absence of defects.
|
[
{
"created": "Tue, 13 Nov 2001 12:26:21 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Kavoussanaki",
"E. D. M.",
""
]
] |
The language and methods of algebraic topology, particularly homotopy theory, have been extensively used in the study of the identification, the classification and the evolution of defects. Topological methods provide the means for the detection of gross features, such as holes in a manifold, and therefore one would clearly anticipate that the defects, if identifiable by such means, to be linked with that kind of configurations. In physical media, however, defects usually manifest themselves in ways which have no distinct and direct association with patterns of topological value along the lines of our previous reference. In this paper we will postulate that the defects do not themselves correspond to topological features. Instead, they are forced to exist in order to redress the violation of physical rules happening as a result of the topological nature of our system. We will, thus, assume that the topology of our system changes with the introduction of defects. Therefore, the relevent to our study topological methods will be applied to a well defined physical system only in the absence of defects.
|
1512.07527
|
Sreerup Raychaudhuri
|
Sabyasachi Chakraborty, Amit Chakraborty, Sreerup Raychaudhuri
|
Diphoton resonance at 750 GeV in the broken MRSSM
|
7 pages, revtex4, 2 eps figures, minor changes made in text and some
references added
|
Phys. Rev. D 94, 035014 (2016)
|
10.1103/PhysRevD.94.035014
|
TIFR-TH/15-47
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Non-observation of superpartners of the Standard Model particles at the early
runs of the LHC provide strong motivation for an $R$-symmetric minimal
supersymmetric Standard Model, or MRSSM. This model also comes with a pair of
extra scalars which couple only to superpartners at the tree level. We
demonstrate that in the limit when the $U(1)_R$ symmetry is broken, one of
these scalars develops all the properties necessary to explain the 750 GeV
diphoton resonance recently observed at the LHC, as well as the non-observation
of associated signals in other channels. Some confirmatory tests in the
upcoming LHC runs are proposed.
|
[
{
"created": "Wed, 23 Dec 2015 15:56:07 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Jan 2016 16:36:54 GMT",
"version": "v2"
}
] |
2016-08-17
|
[
[
"Chakraborty",
"Sabyasachi",
""
],
[
"Chakraborty",
"Amit",
""
],
[
"Raychaudhuri",
"Sreerup",
""
]
] |
Non-observation of superpartners of the Standard Model particles at the early runs of the LHC provide strong motivation for an $R$-symmetric minimal supersymmetric Standard Model, or MRSSM. This model also comes with a pair of extra scalars which couple only to superpartners at the tree level. We demonstrate that in the limit when the $U(1)_R$ symmetry is broken, one of these scalars develops all the properties necessary to explain the 750 GeV diphoton resonance recently observed at the LHC, as well as the non-observation of associated signals in other channels. Some confirmatory tests in the upcoming LHC runs are proposed.
|
hep-ph/0702128
|
Meng Lu
|
Eric Braaten, Meng Lu and Jungil Lee
|
Weakly-bound Hadronic Molecule near a 3-body Threshold
|
37 pages, 13 figures, submitted to Phys.Rev.D
|
Phys.Rev.D76:054010,2007
|
10.1103/PhysRevD.76.054010
| null |
hep-ph
| null |
The X(3872) seems to be a loosely-bound hadronic molecule whose constituents
are two charm mesons. A novel feature of this molecule is that the mass
difference of the constituents is close to the mass of a lighter meson that can
be exchanged between them, namely the pion. We analyze this feature in a simple
model with spin-0 mesons only. Various observables are calculated to
next-to-leading order in the interaction strength of the exchanged meson.
Renormalization requires summing a geometric series of next-to-leading order
corrections. The dependence of observables on the ultraviolet cutoff can be
removed by renormalizations of the mass of the heaviest meson, the coupling
constant for the contact interaction between the heavy mesons, and
short-distance coefficients in the operator product expansion. The
next-to-leading order correction has an unphysical infrared divergence at the
threshold of the two heavier mesons that can be eliminated by a further
resummation that takes into account the nonzero width of the heaviest meson.
|
[
{
"created": "Tue, 13 Feb 2007 05:17:02 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Braaten",
"Eric",
""
],
[
"Lu",
"Meng",
""
],
[
"Lee",
"Jungil",
""
]
] |
The X(3872) seems to be a loosely-bound hadronic molecule whose constituents are two charm mesons. A novel feature of this molecule is that the mass difference of the constituents is close to the mass of a lighter meson that can be exchanged between them, namely the pion. We analyze this feature in a simple model with spin-0 mesons only. Various observables are calculated to next-to-leading order in the interaction strength of the exchanged meson. Renormalization requires summing a geometric series of next-to-leading order corrections. The dependence of observables on the ultraviolet cutoff can be removed by renormalizations of the mass of the heaviest meson, the coupling constant for the contact interaction between the heavy mesons, and short-distance coefficients in the operator product expansion. The next-to-leading order correction has an unphysical infrared divergence at the threshold of the two heavier mesons that can be eliminated by a further resummation that takes into account the nonzero width of the heaviest meson.
|
1203.3825
|
He Zhang
|
Werner Rodejohann, He Zhang
|
Impact of massive neutrinos on the Higgs self-coupling and electroweak
vacuum stability
|
17 pages, 7 figures, minor revisions, version to appear in JHEP
| null |
10.1007/JHEP06(2012)022
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The presence of right-handed neutrinos in the type I seesaw mechanism may
lead to significant corrections to the RG evolution of the Higgs self-coupling.
Compared to the Standard Model case, the Higgs mass window can become narrower,
and the cutoff scale become lower. Naively, these effects decrease with
decreasing right-handed neutrino mass. However, we point out that the unknown
Dirac Yukawa matrix may impact the vacuum stability constraints even in the low
scale seesaw case not far away from the electroweak scale, hence much below the
canonical seesaw scale of 10^15 GeV. This includes situations in which
production of right-handed neutrinos at colliders is possible. We illustrate
this within a particular parametrization of the Dirac Yukawas and with explicit
low scale seesaw models. We also note the effect of massive neutrinos on the
top quark Yukawa coupling, whose high energy value can be increased with
respect to the Standard Model case.
|
[
{
"created": "Fri, 16 Mar 2012 22:21:07 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Jun 2012 14:42:46 GMT",
"version": "v2"
}
] |
2015-06-04
|
[
[
"Rodejohann",
"Werner",
""
],
[
"Zhang",
"He",
""
]
] |
The presence of right-handed neutrinos in the type I seesaw mechanism may lead to significant corrections to the RG evolution of the Higgs self-coupling. Compared to the Standard Model case, the Higgs mass window can become narrower, and the cutoff scale become lower. Naively, these effects decrease with decreasing right-handed neutrino mass. However, we point out that the unknown Dirac Yukawa matrix may impact the vacuum stability constraints even in the low scale seesaw case not far away from the electroweak scale, hence much below the canonical seesaw scale of 10^15 GeV. This includes situations in which production of right-handed neutrinos at colliders is possible. We illustrate this within a particular parametrization of the Dirac Yukawas and with explicit low scale seesaw models. We also note the effect of massive neutrinos on the top quark Yukawa coupling, whose high energy value can be increased with respect to the Standard Model case.
|
1701.00894
|
Xiang Liu
|
Qi Huang, Bo Wang, Xiang Liu, Dian-Yong Chen, and Takayuki Matsuki
|
Exploring the $\Upsilon(6S)\to \chi_{bJ}\phi$ and $\Upsilon(6S)\to
\chi_{bJ}\omega$ hidden-bottom hadronic transitions
|
10 pages, 10 figures and 1 table. Accepted by Eur. Phys. J. C
|
Eur. Phys. J. C, 77 (2017) 165
|
10.1140/epjc/s10052-017-4726-8
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this work, we investigate the hadronic loop contributions to the
$\Upsilon(6S) \to \chi_{bJ} \phi~(J=0,1,2)$ along with $\Upsilon(6S) \to
\chi_{bJ} \omega~(J=0,1,2)$ transitions. We predict that the branching ratios
of $\Upsilon(6S) \to \chi_{b0} \phi$, $\Upsilon(6S) \to \chi_{b1} \phi$ and
$\Upsilon(6S) \to \chi_{b2} \phi$ are $(0.68 \sim 4.62) \times 10^{-6}$, $(0.50
\sim 3.43) \times 10^{-6}$ and $(2.22 \sim 15.18) \times 10^{-6}$, respectively
and those of $\Upsilon(6S) \to \chi_{b0} \omega$, $\Upsilon(6S) \to \chi_{b1}
\omega$ and $\Upsilon(6S) \to \chi_{b2} \omega$ are $(0.15 \sim 2.81) \times
10^{-3}$, $(0.63 \sim 11.68) \times 10^{-3}$ and $(1.08 \sim 20.02) \times
10^{-3}$, respectively. Especially, some typical ratios, which reflect the
relative magnitudes of the predicted branching ratios, are given, i.e., for
$\Upsilon(6S)\to \chi_{bJ}\phi$ transitions,
$\mathcal{R}^\phi_{10}={\mathcal{B}[\Upsilon(6S) \to \chi_{b1}
\phi]}/{\mathcal{B}[\Upsilon(6S) \to \chi_{b0} \phi]} \approx 0.74$,
$\mathcal{R}^\phi_{20}= {\mathcal{B}[\Upsilon(6S) \to \chi_{b2}
\phi]}/{\mathcal{B}[\Upsilon(6S) \to \chi_{b0} \phi]} \approx 3.28$, and
$\mathcal{R}^\phi_{21} = {\mathcal{B}[\Upsilon(6S) \to \chi_{b2}
\phi]}/{\mathcal{B}[\Upsilon(6S) \to \chi_{b1} \phi]} \approx 4.43$, and for
$\Upsilon(6S)\to \chi_{bJ}\omega$ transitions,
$\mathcal{R}^\omega_{10}={\mathcal{B}[\Upsilon(6S) \to \chi_{b1}
\omega]}/{\mathcal{B}[\Upsilon(6S) \to \chi_{b0} \omega]} \approx 4.11$,
$\mathcal{R}^\omega_{20}= {\mathcal{B}[\Upsilon(6S) \to \chi_{b2}
\omega]}/{\mathcal{B}[\Upsilon(6S) \to \chi_{b0} \omega]} \approx 7.06$, and
$\mathcal{R}^\omega_{21} = {\mathcal{B}[\Upsilon(6S) \to \chi_{b2}
\omega]}/{\mathcal{B}[\Upsilon(6S) \to \chi_{b1} \omega]} \approx 1.72$. With
the running of BelleII in the near future, experimental measurement of these
two kinds of transitions will be a potential research issue.
|
[
{
"created": "Wed, 4 Jan 2017 04:03:22 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Feb 2017 00:00:57 GMT",
"version": "v2"
}
] |
2017-03-23
|
[
[
"Huang",
"Qi",
""
],
[
"Wang",
"Bo",
""
],
[
"Liu",
"Xiang",
""
],
[
"Chen",
"Dian-Yong",
""
],
[
"Matsuki",
"Takayuki",
""
]
] |
In this work, we investigate the hadronic loop contributions to the $\Upsilon(6S) \to \chi_{bJ} \phi~(J=0,1,2)$ along with $\Upsilon(6S) \to \chi_{bJ} \omega~(J=0,1,2)$ transitions. We predict that the branching ratios of $\Upsilon(6S) \to \chi_{b0} \phi$, $\Upsilon(6S) \to \chi_{b1} \phi$ and $\Upsilon(6S) \to \chi_{b2} \phi$ are $(0.68 \sim 4.62) \times 10^{-6}$, $(0.50 \sim 3.43) \times 10^{-6}$ and $(2.22 \sim 15.18) \times 10^{-6}$, respectively and those of $\Upsilon(6S) \to \chi_{b0} \omega$, $\Upsilon(6S) \to \chi_{b1} \omega$ and $\Upsilon(6S) \to \chi_{b2} \omega$ are $(0.15 \sim 2.81) \times 10^{-3}$, $(0.63 \sim 11.68) \times 10^{-3}$ and $(1.08 \sim 20.02) \times 10^{-3}$, respectively. Especially, some typical ratios, which reflect the relative magnitudes of the predicted branching ratios, are given, i.e., for $\Upsilon(6S)\to \chi_{bJ}\phi$ transitions, $\mathcal{R}^\phi_{10}={\mathcal{B}[\Upsilon(6S) \to \chi_{b1} \phi]}/{\mathcal{B}[\Upsilon(6S) \to \chi_{b0} \phi]} \approx 0.74$, $\mathcal{R}^\phi_{20}= {\mathcal{B}[\Upsilon(6S) \to \chi_{b2} \phi]}/{\mathcal{B}[\Upsilon(6S) \to \chi_{b0} \phi]} \approx 3.28$, and $\mathcal{R}^\phi_{21} = {\mathcal{B}[\Upsilon(6S) \to \chi_{b2} \phi]}/{\mathcal{B}[\Upsilon(6S) \to \chi_{b1} \phi]} \approx 4.43$, and for $\Upsilon(6S)\to \chi_{bJ}\omega$ transitions, $\mathcal{R}^\omega_{10}={\mathcal{B}[\Upsilon(6S) \to \chi_{b1} \omega]}/{\mathcal{B}[\Upsilon(6S) \to \chi_{b0} \omega]} \approx 4.11$, $\mathcal{R}^\omega_{20}= {\mathcal{B}[\Upsilon(6S) \to \chi_{b2} \omega]}/{\mathcal{B}[\Upsilon(6S) \to \chi_{b0} \omega]} \approx 7.06$, and $\mathcal{R}^\omega_{21} = {\mathcal{B}[\Upsilon(6S) \to \chi_{b2} \omega]}/{\mathcal{B}[\Upsilon(6S) \to \chi_{b1} \omega]} \approx 1.72$. With the running of BelleII in the near future, experimental measurement of these two kinds of transitions will be a potential research issue.
|
hep-ph/0009137
|
Eduard Kuraev
|
E.A.Kuraev (JINR), L.N.Lipatov (PNPI), T.V.Shishkina (BSU)
|
QED radiative corrections to impact factors
|
8 pp, plain LaTeX
|
J.Exp.Theor.Phys. 92 (2001) 203-209; Zh.Eksp.Teor.Fiz. 92 (2001)
236-242
|
10.1134/1.1354677
| null |
hep-ph
| null |
We consider the radiative corrections to the impact factors of electron and
photon. According to a generalized eikonal representation the e\bar e
scattering amplitude at high energies and fixed momentum transfers is
proportional to the electron form factor. But we show that this representation
is violated due to the presence of non-planar diagrams. One loop correction to
the photon impact factor for small virtualities of the exchanged photon is
obtained using the known results for the cross section of the e\bar e
production at photon-nuclei interactions.
|
[
{
"created": "Tue, 12 Sep 2000 06:23:54 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Kuraev",
"E. A.",
"",
"JINR"
],
[
"Lipatov",
"L. N.",
"",
"PNPI"
],
[
"Shishkina",
"T. V.",
"",
"BSU"
]
] |
We consider the radiative corrections to the impact factors of electron and photon. According to a generalized eikonal representation the e\bar e scattering amplitude at high energies and fixed momentum transfers is proportional to the electron form factor. But we show that this representation is violated due to the presence of non-planar diagrams. One loop correction to the photon impact factor for small virtualities of the exchanged photon is obtained using the known results for the cross section of the e\bar e production at photon-nuclei interactions.
|
1708.07956
|
Ozan Sarg{\i}n
|
Durmu\c{s} Demir, Canan Karahan, Beste Korutlu, Ozan Sarg{\i}n
|
Hidden Spin-3/2 Field in the Standard Model
|
8 pages, 8 figures, accepted for publication in Eur. Phys. J. C
|
Eur.Phys.J.C 77 (2017) 9, 593
|
10.1140/epjc/s10052-017-5164-3
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Here we show that a massive spin-3/2 field can hide in the SM spectrum in a
way revealing itself only virtually. We study collider signatures and loop
effects of this field, and determine its role in Higgs inflation and its
potential as Dark Matter. We show that this spin-3/2 field has a rich linear
collider phenomenology and motivates consideration of a neutrino-Higgs
collider. We also show that study of Higgs inflation, dark matter and dark
energy can reveal more about the neutrino and dark sector.
|
[
{
"created": "Sat, 26 Aug 2017 10:44:42 GMT",
"version": "v1"
}
] |
2024-02-08
|
[
[
"Demir",
"Durmuş",
""
],
[
"Karahan",
"Canan",
""
],
[
"Korutlu",
"Beste",
""
],
[
"Sargın",
"Ozan",
""
]
] |
Here we show that a massive spin-3/2 field can hide in the SM spectrum in a way revealing itself only virtually. We study collider signatures and loop effects of this field, and determine its role in Higgs inflation and its potential as Dark Matter. We show that this spin-3/2 field has a rich linear collider phenomenology and motivates consideration of a neutrino-Higgs collider. We also show that study of Higgs inflation, dark matter and dark energy can reveal more about the neutrino and dark sector.
|
hep-ph/9909518
|
Uma Mahanta
|
Uma Mahanta
|
Neutrino masses and mixing angles from leptoquark interactions
|
The expressions for majorana mass matrix of neutrinos have been
corrected so that they are symmetric. Final version to be published in
Physical Review D
|
Phys.Rev. D62 (2000) 073009
|
10.1103/PhysRevD.62.073009
| null |
hep-ph
| null |
In this paper we show that the mixing between leptoquarks (LQ's) from
different $SU(2)_l$ multiplets can generate a non-trivial Majorana mass matrix
for neutrinos through one loop self energy diagrams. Such mixing can arise from
gauge invariant and renormalizable LQ-Higgs interaction terms after EW symmetry
breaking. We use the experimental indication on neutrino oscillation to find
constraints on specific combinations of LQ couplings to quark-lepton pairs and
to the SM higgs boson. These constraints are compared with the ones from
$\pi\to e\bar {\nu}_e$.
|
[
{
"created": "Mon, 27 Sep 1999 11:18:14 GMT",
"version": "v1"
},
{
"created": "Fri, 19 May 2000 13:22:05 GMT",
"version": "v2"
}
] |
2009-10-31
|
[
[
"Mahanta",
"Uma",
""
]
] |
In this paper we show that the mixing between leptoquarks (LQ's) from different $SU(2)_l$ multiplets can generate a non-trivial Majorana mass matrix for neutrinos through one loop self energy diagrams. Such mixing can arise from gauge invariant and renormalizable LQ-Higgs interaction terms after EW symmetry breaking. We use the experimental indication on neutrino oscillation to find constraints on specific combinations of LQ couplings to quark-lepton pairs and to the SM higgs boson. These constraints are compared with the ones from $\pi\to e\bar {\nu}_e$.
|
hep-ph/0410325
|
Zuo-Tang Liang
|
Zuo-Tang Liang (Shandong U.)
|
Spin structure of nucleon and spin transfer in high energy fragmentation
process
|
Invited contribution to the 10th International Symposium on
Meson-Nucleon Physics & the Structure of the Nucleon (MENU2004), 4 pages, 1
figure
|
Int.J.Mod.Phys. A20 (2005) 1998-2001
|
10.1142/S0217751X05023827
| null |
hep-ph
| null |
Spin transfer in high energy fragmentation process is determined by the
hadronization mechanism and spin structure of hadrons.It can be studied by
measuring the polarizations of hyperons and/or vector mesons in e+e-
annihilation, in the current fragmentation region of polarized deeply inelastic
lN-scatterings, and high p_T-jets in polarized pp-collisions.Theoretical
calculations have been made using different models.In this talk, I will briefly
summarize the main features of the models, the results obtained and the
comparison with available data. They can be used for future tests by
experiments.
|
[
{
"created": "Mon, 25 Oct 2004 06:21:24 GMT",
"version": "v1"
}
] |
2009-11-10
|
[
[
"Liang",
"Zuo-Tang",
"",
"Shandong U."
]
] |
Spin transfer in high energy fragmentation process is determined by the hadronization mechanism and spin structure of hadrons.It can be studied by measuring the polarizations of hyperons and/or vector mesons in e+e- annihilation, in the current fragmentation region of polarized deeply inelastic lN-scatterings, and high p_T-jets in polarized pp-collisions.Theoretical calculations have been made using different models.In this talk, I will briefly summarize the main features of the models, the results obtained and the comparison with available data. They can be used for future tests by experiments.
|
1607.01468
|
Jayden Newstead
|
James B. Dent, Bhaskar Dutta, Jayden L. Newstead and Louis E. Strigari
|
Dark matter, light mediators, and the neutrino floor
|
4 pages, 2 figures
|
Phys. Rev. D 95, 051701 (2017)
|
10.1103/PhysRevD.95.051701
| null |
hep-ph astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We analyze future direct data matter detection experiments using Effective
Field Theory (EFT) operators with light, $\lesssim 100$ MeV mass mediators. We
compare the nuclear recoil energy spectra from these operators to the predicted
high energy solar neutrino spectrum. A set of operators that generate spectra
similar to the neutrino background is identified, however this set is distinct
from those that mimic the neutrino background for heavy, $\gtrsim 100$ MeV mass
mediators. We outline a general classification scheme based on momentum
dependence of the dark matter-nucleus interaction to determine how strong the
discovery limit for a given operator saturates in the presence of the neutrino
background. Our results highlight the benefit of considering a general
theoretical framework regarding dark matter, and motivate continued
experimental progress towards lower nuclear recoil energy thresholds.
|
[
{
"created": "Wed, 6 Jul 2016 03:13:07 GMT",
"version": "v1"
}
] |
2017-03-29
|
[
[
"Dent",
"James B.",
""
],
[
"Dutta",
"Bhaskar",
""
],
[
"Newstead",
"Jayden L.",
""
],
[
"Strigari",
"Louis E.",
""
]
] |
We analyze future direct data matter detection experiments using Effective Field Theory (EFT) operators with light, $\lesssim 100$ MeV mass mediators. We compare the nuclear recoil energy spectra from these operators to the predicted high energy solar neutrino spectrum. A set of operators that generate spectra similar to the neutrino background is identified, however this set is distinct from those that mimic the neutrino background for heavy, $\gtrsim 100$ MeV mass mediators. We outline a general classification scheme based on momentum dependence of the dark matter-nucleus interaction to determine how strong the discovery limit for a given operator saturates in the presence of the neutrino background. Our results highlight the benefit of considering a general theoretical framework regarding dark matter, and motivate continued experimental progress towards lower nuclear recoil energy thresholds.
|
hep-ph/9504357
|
Kotikov Anatoly
|
A.V.Kotikov (Lab. Phys. Theor. ENSLAPP LAPP, Annecy-le-Vieux, France)
|
Small $x$ Behaviour of Parton Distributions in Proton
|
11 pages, Latex without figures
|
Mod.Phys.Lett.A11:103-118,1996
|
10.1142/S0217732396000138
| null |
hep-ph
| null |
The paper presents the $QCD$ description of the hard and semihard processes
in the framework of the Wilson operator product expansion. The smooth
transition between the cases of the soft and hard Pomerons is obtained.
|
[
{
"created": "Fri, 21 Apr 1995 09:07:08 GMT",
"version": "v1"
}
] |
2014-11-17
|
[
[
"Kotikov",
"A. V.",
"",
"Lab. Phys. Theor. ENSLAPP LAPP, Annecy-le-Vieux, France"
]
] |
The paper presents the $QCD$ description of the hard and semihard processes in the framework of the Wilson operator product expansion. The smooth transition between the cases of the soft and hard Pomerons is obtained.
|
1801.04729
|
Peiwen Wu
|
Takaaki Nomura, Hiroshi Okada, Peiwen Wu
|
A radiative neutrino mass model in light of DAMPE excess with hidden
gauged $U(1)$ symmetry
|
14 pages, 5 figures, 1 table
| null |
10.1088/1475-7516/2018/05/053
| null |
hep-ph astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We propose a one-loop induced neutrino mass model with hidden $U(1)$ gauge
symmetry, in which we successfully involve a bosonic dark matter (DM) candidate
propagating inside a loop diagram in neutrino mass generation to explain the
$e^+e^-$ excess recently reported by the DArk Matter Particle Explorer (DAMPE)
experiment. In our scenario dark matter annihilates into four leptons through
$Z'$ boson as DM DM $\to Z' Z' (Z' \to \ell^+ \ell^-)$ and $Z'$ decays into
leptons via one-loop effect. We then investigate branching ratios of $Z'$
taking into account lepton flavor violations and neutrino oscillation data.
|
[
{
"created": "Mon, 15 Jan 2018 10:44:16 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Feb 2018 07:56:47 GMT",
"version": "v2"
}
] |
2018-06-06
|
[
[
"Nomura",
"Takaaki",
""
],
[
"Okada",
"Hiroshi",
""
],
[
"Wu",
"Peiwen",
""
]
] |
We propose a one-loop induced neutrino mass model with hidden $U(1)$ gauge symmetry, in which we successfully involve a bosonic dark matter (DM) candidate propagating inside a loop diagram in neutrino mass generation to explain the $e^+e^-$ excess recently reported by the DArk Matter Particle Explorer (DAMPE) experiment. In our scenario dark matter annihilates into four leptons through $Z'$ boson as DM DM $\to Z' Z' (Z' \to \ell^+ \ell^-)$ and $Z'$ decays into leptons via one-loop effect. We then investigate branching ratios of $Z'$ taking into account lepton flavor violations and neutrino oscillation data.
|
hep-ph/0202194
|
Lorenz von Smekal
|
Christoph Lerche (1,2) and Lorenz von Smekal (1) ((1) Universitaet
Erlangen-Nuernberg, (2) Instituto de Fisica Corpuscular, Valencia)
|
On the Infrared Exponent for Gluon and Ghost Propagation in Landau Gauge
QCD
|
22 Pages, 10 Figures, LaTeX2e, revtex4, some notes and references
added in response to communications
|
Phys.Rev. D65 (2002) 125006
|
10.1103/PhysRevD.65.125006
|
FAU-TP3-01/11
|
hep-ph hep-th
| null |
In the covariant description of confinement, one expects the ghost
correlations to be infrared enhanced. Assuming ghost dominance, the long-range
behavior of gluon and ghost correlations in Landau gauge QCD is determined by
one exponent kappa. The gluon propagator is infrared finite (vanishing) for
kappa =1/2 (kappa > 1/2) which is still under debate. Here, we study critical
exponent and coupling for the infrared conformal behavior from the asymptotic
form of the solutions to the Dyson-Schwinger equations in an ultraviolet finite
expansion scheme. The value for kappa is directly related to the ghost-gluon
vertex. Assuming that it is regular in the infrared, one obtains kappa = 0.595.
This value maximizes the critical coupling alpha_c(kappa), yielding alpha_c^max
= (4 Pi/Nc) 0.709 approx. 2.97 for Nc=3. For larger kappa the vertex acquires
an infrared singularity in the gluon momentum, smaller ones imply infrared
singular ghost legs. Variations in alpha_c remain within 5% from kappa = 0.5 to
0.7. Above this range, alpha_c decreases more rapidly with alpha_c -> 0 as
kappa -> 1 which sets the upper bound on kappa.
|
[
{
"created": "Wed, 20 Feb 2002 15:52:48 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Feb 2002 11:58:37 GMT",
"version": "v2"
}
] |
2009-11-07
|
[
[
"Lerche",
"Christoph",
""
],
[
"von Smekal",
"Lorenz",
""
]
] |
In the covariant description of confinement, one expects the ghost correlations to be infrared enhanced. Assuming ghost dominance, the long-range behavior of gluon and ghost correlations in Landau gauge QCD is determined by one exponent kappa. The gluon propagator is infrared finite (vanishing) for kappa =1/2 (kappa > 1/2) which is still under debate. Here, we study critical exponent and coupling for the infrared conformal behavior from the asymptotic form of the solutions to the Dyson-Schwinger equations in an ultraviolet finite expansion scheme. The value for kappa is directly related to the ghost-gluon vertex. Assuming that it is regular in the infrared, one obtains kappa = 0.595. This value maximizes the critical coupling alpha_c(kappa), yielding alpha_c^max = (4 Pi/Nc) 0.709 approx. 2.97 for Nc=3. For larger kappa the vertex acquires an infrared singularity in the gluon momentum, smaller ones imply infrared singular ghost legs. Variations in alpha_c remain within 5% from kappa = 0.5 to 0.7. Above this range, alpha_c decreases more rapidly with alpha_c -> 0 as kappa -> 1 which sets the upper bound on kappa.
|
1908.11741
|
Wei Liu
|
Frank F. Deppisch, Suchita Kulkarni, Wei Liu
|
Searching for a light $Z'$ through Higgs production at the LHC
|
26 pages, 9 figures, 9 references added, matches published version
|
Phys. Rev. D 100, 115023 (2019)
|
10.1103/PhysRevD.100.115023
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the potential of LHC resonance searches in leptonic final
states to probe the $Z'$ in the minimal $U(1)_{B-L}$ model. Considering the
current constraints on the $Z'$ in terms of its mass $m_{Z'}$ and the
associated gauge coupling $g_{B-L}$ as well as constraints in the Higgs sector,
we analyse the potential of dilepton and four lepton final states for $Z'$
production. This includes Drell-Yan production, Higgs mediated decays and final
state radiation processes concentrating only on the ATLAS and CMS detectors at
the LHC. We show that the four-lepton final state is sensitive to $m_{Z'}$ as
low as 0.25 GeV. Furthermore, setting the Higgs mixing to $\sin\alpha = 0.3$,
this final state has a strong sensitivity and it probes regions of parameter
space where the $Z'$ is long-lived. We demonstrate the sensitivity at the High
Luminosity LHC and comment on the potential of probing displaced vertices due
to long-lived $Z'$. Finally, we also comment on the strength of $Z'$ and Higgs
mediated heavy neutrino processes by taking into account the constraints
derived.
|
[
{
"created": "Fri, 30 Aug 2019 13:54:42 GMT",
"version": "v1"
},
{
"created": "Thu, 12 Dec 2019 11:00:34 GMT",
"version": "v2"
}
] |
2019-12-18
|
[
[
"Deppisch",
"Frank F.",
""
],
[
"Kulkarni",
"Suchita",
""
],
[
"Liu",
"Wei",
""
]
] |
We investigate the potential of LHC resonance searches in leptonic final states to probe the $Z'$ in the minimal $U(1)_{B-L}$ model. Considering the current constraints on the $Z'$ in terms of its mass $m_{Z'}$ and the associated gauge coupling $g_{B-L}$ as well as constraints in the Higgs sector, we analyse the potential of dilepton and four lepton final states for $Z'$ production. This includes Drell-Yan production, Higgs mediated decays and final state radiation processes concentrating only on the ATLAS and CMS detectors at the LHC. We show that the four-lepton final state is sensitive to $m_{Z'}$ as low as 0.25 GeV. Furthermore, setting the Higgs mixing to $\sin\alpha = 0.3$, this final state has a strong sensitivity and it probes regions of parameter space where the $Z'$ is long-lived. We demonstrate the sensitivity at the High Luminosity LHC and comment on the potential of probing displaced vertices due to long-lived $Z'$. Finally, we also comment on the strength of $Z'$ and Higgs mediated heavy neutrino processes by taking into account the constraints derived.
|
1201.2673
|
Angelo Raffaele Fazio
|
A. R. Fazio, S. C. Vargas
|
Helicity Spinor Methods and Tree Level QCD Corrections in Higgs
Production via Weak Boson Fusion
|
Results presented by the authors in the poster session of The 29th
Jerusalem Winter School in Theoretical Physics
| null | null | null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We calculate analytically tree level amplitudes for Higgs production via Weak
Bosons Fusion (WBF) and QCD corrections to the Standard Model prediction (SM)
by using the helicity spinor formalism. We provide the explicit expression for
the amplitude with two gluons emission in the final state together with
massless final two quarks. The massive generalization of the
Britto-Cachazo-Feng-Witten (BCFW) recursion scheme is applied successfully
obtaining compact results which agree with, and overcome in simplicity, the
conventional Feynman diagrams approach.
|
[
{
"created": "Thu, 12 Jan 2012 20:55:27 GMT",
"version": "v1"
}
] |
2012-01-13
|
[
[
"Fazio",
"A. R.",
""
],
[
"Vargas",
"S. C.",
""
]
] |
We calculate analytically tree level amplitudes for Higgs production via Weak Bosons Fusion (WBF) and QCD corrections to the Standard Model prediction (SM) by using the helicity spinor formalism. We provide the explicit expression for the amplitude with two gluons emission in the final state together with massless final two quarks. The massive generalization of the Britto-Cachazo-Feng-Witten (BCFW) recursion scheme is applied successfully obtaining compact results which agree with, and overcome in simplicity, the conventional Feynman diagrams approach.
|
1807.06388
|
Giuliano Giacalone
|
Giuliano Giacalone and Cyrille Marquet
|
Signature of gluon saturation in forward di-hadron correlations at the
Large Hadron Collider
|
4 pages; 2 figures
| null |
10.1016/j.nuclphysa.2018.10.009
| null |
hep-ph hep-ex nucl-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We argue that gluon saturation effects may be visible in Large Hadron
Collider (LHC) data. We look at the centrality dependence of the away-side peak
of two-particle correlations measured in p-Pb collisions, using both ALICE data
at midrapidity, and LHCb data at forward rapidity. Once the collective
flow-like signal measured at the near-side peak is removed from the correlation
function, the centrality dependence of the away-side peak turns out to be much
stronger in the forward region than at midrapidity. We argue that this is a
very specific prediction of the saturation framework, and we compare LHCb data
to a state-of-the-art calculation within the Color Glass Condensate theory.
|
[
{
"created": "Tue, 17 Jul 2018 12:46:38 GMT",
"version": "v1"
}
] |
2019-02-20
|
[
[
"Giacalone",
"Giuliano",
""
],
[
"Marquet",
"Cyrille",
""
]
] |
We argue that gluon saturation effects may be visible in Large Hadron Collider (LHC) data. We look at the centrality dependence of the away-side peak of two-particle correlations measured in p-Pb collisions, using both ALICE data at midrapidity, and LHCb data at forward rapidity. Once the collective flow-like signal measured at the near-side peak is removed from the correlation function, the centrality dependence of the away-side peak turns out to be much stronger in the forward region than at midrapidity. We argue that this is a very specific prediction of the saturation framework, and we compare LHCb data to a state-of-the-art calculation within the Color Glass Condensate theory.
|
1701.05890
|
Gaurav Kumar Tomar
|
Gaurav Tomar
|
Lorentz invariance violation as an explanation of muon excess in Auger
data
|
10 pages, 2 figures. v2: version accepted for publication in PRD
| null |
10.1103/PhysRevD.95.095035
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The Auger collaboration has observed the number of muons which is higher than
its prediction by existing hadronic interaction models. We explain this excess
of muons by using Lorentz invariance violation (LIV) in photon sector. As an
outcome of Lorentz invariance violation, the dispersion relation of photon gets
modified, which we use for the calculation of $\pi^0$ decay width. In the Auger
data of primary energy $10^{9.8}<E(\mbox{GeV})<10^{10.2}$, we find that the
neutral pion decay width is suppressed in comparison to its standard model (SM)
counterpart. As a result, we get a large number of muons explaining the
observed muon excess. We consider Planck suppressed LIV at order
$\mathcal{O}(p^2/M^2_{\tiny \mbox{Pl}})$ for studying the photon sector, which
is in agreement with the current bounds, and not as tightly constrained as LIV
at order $\mathcal{O}(p/M_{\tiny \mbox{Pl}})$.
|
[
{
"created": "Fri, 20 Jan 2017 18:45:20 GMT",
"version": "v1"
},
{
"created": "Tue, 16 May 2017 09:02:15 GMT",
"version": "v2"
}
] |
2017-06-28
|
[
[
"Tomar",
"Gaurav",
""
]
] |
The Auger collaboration has observed the number of muons which is higher than its prediction by existing hadronic interaction models. We explain this excess of muons by using Lorentz invariance violation (LIV) in photon sector. As an outcome of Lorentz invariance violation, the dispersion relation of photon gets modified, which we use for the calculation of $\pi^0$ decay width. In the Auger data of primary energy $10^{9.8}<E(\mbox{GeV})<10^{10.2}$, we find that the neutral pion decay width is suppressed in comparison to its standard model (SM) counterpart. As a result, we get a large number of muons explaining the observed muon excess. We consider Planck suppressed LIV at order $\mathcal{O}(p^2/M^2_{\tiny \mbox{Pl}})$ for studying the photon sector, which is in agreement with the current bounds, and not as tightly constrained as LIV at order $\mathcal{O}(p/M_{\tiny \mbox{Pl}})$.
|
hep-ph/9712510
|
Stuart Raby
|
Stuart Raby (The Ohio State University)
|
Lepton Flavor Violation and Fermion Masses
|
11 pages, Latex, talk presented at the Workshop on Physics at the
First Muon Collider and at the Front End of a Muon Collider, November
6-9,1997, FNAL
| null |
10.1063/1.56251
|
OHSTPY-HEP-T-97-025
|
hep-ph
| null |
Lepton flavor violation may be a signature of "GUT scale" physics, if the
messenger scale for SUSY breaking is above the "GUT scale." We elaborate on the
details of this simple statement in the following talk.
|
[
{
"created": "Tue, 23 Dec 1997 18:03:42 GMT",
"version": "v1"
}
] |
2009-10-30
|
[
[
"Raby",
"Stuart",
"",
"The Ohio State University"
]
] |
Lepton flavor violation may be a signature of "GUT scale" physics, if the messenger scale for SUSY breaking is above the "GUT scale." We elaborate on the details of this simple statement in the following talk.
|
2206.06933
|
Deepesh Bhamre
|
Deepesh Bhamre, Anuradha Misra
|
Infrared Divergences in $e^{+}e^{-}\rightarrow 2\; jets$ in the Light
Front Coherent State Formalism
|
23 pages, 5 figures. Published version. Minor additions and changes
compared to v2
|
Phys. Rev. D 107, 014001 (2023)
|
10.1103/PhysRevD.107.014001
| null |
hep-ph hep-th
|
http://creativecommons.org/licenses/by/4.0/
|
We study infrared (IR) divergences in light front quantum chromodynamics
using a coherent state basis in light front time-ordered Hamiltonian
perturbation theory. In computation of the S-matrix elements in Hamiltonian
formalism, the IR divergences appear in the form of vanishing energy
denominators. We consider the process $e^{+}e^{-}\rightarrow 2\; jets$ at
$\mathcal{O}(g^{2})$ in strong coupling, construct the coherent state
representing the outgoing particles, and explicitly show that the `true' IR
divergences cancel to this order when the matrix elements are calculated
between coherent states instead of Fock states.
|
[
{
"created": "Tue, 14 Jun 2022 15:53:05 GMT",
"version": "v1"
},
{
"created": "Sun, 30 Oct 2022 18:21:01 GMT",
"version": "v2"
},
{
"created": "Mon, 30 Jan 2023 06:47:13 GMT",
"version": "v3"
}
] |
2023-01-31
|
[
[
"Bhamre",
"Deepesh",
""
],
[
"Misra",
"Anuradha",
""
]
] |
We study infrared (IR) divergences in light front quantum chromodynamics using a coherent state basis in light front time-ordered Hamiltonian perturbation theory. In computation of the S-matrix elements in Hamiltonian formalism, the IR divergences appear in the form of vanishing energy denominators. We consider the process $e^{+}e^{-}\rightarrow 2\; jets$ at $\mathcal{O}(g^{2})$ in strong coupling, construct the coherent state representing the outgoing particles, and explicitly show that the `true' IR divergences cancel to this order when the matrix elements are calculated between coherent states instead of Fock states.
|
1903.02017
|
Koji Nagano
|
Koji Nagano, Tomohiro Fujita, Yuta Michimura, Ippei Obata
|
Axion Dark Matter Search with Interferometric Gravitational Wave
Detectors
|
7 pages, 2 figures
|
Phys. Rev. Lett. 123, 111301 (2019)
|
10.1103/PhysRevLett.123.111301
| null |
hep-ph astro-ph.CO astro-ph.IM physics.ins-det physics.optics
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Axion dark matter differentiates the phase velocities of the
circular-polarized photons. In this Letter, a scheme to measure the phase
difference by using a linear optical cavity is proposed. If the scheme is
applied to the Fabry-P\'erot arm of Advanced LIGO-like (Cosmic-Explorer-like)
gravitational wave detector, the potential sensitivity to the axion-photon
coupling constant, $g_{\text{a}\gamma}$, reaches $g_{\text{a}\gamma} \simeq
8\times10^{-13}$ GeV$^{-1}\, (4 \times 10^{-14}$ GeV$^{-1})$ at the axion mass
$m \simeq 3\times 10^{-13}$ eV ($2\times10^{-15}$ eV) and remains at around
this sensitivity for 3 orders of magnitude in mass. Furthermore, its
sensitivity has a sharp peak reaching $g_{\text{a}\gamma} \simeq 10^{-14}$
GeV$^{-1}$ $(8\times10^{-17}$ GeV$^{-1})$ at $m = 1.563\times10^{-10}$ eV
($1.563\times10^{-11}$ eV). This sensitivity can be achieved without loosing
any sensitivity to gravitational waves.
|
[
{
"created": "Tue, 5 Mar 2019 19:07:55 GMT",
"version": "v1"
},
{
"created": "Thu, 31 Oct 2019 07:09:08 GMT",
"version": "v2"
}
] |
2019-11-01
|
[
[
"Nagano",
"Koji",
""
],
[
"Fujita",
"Tomohiro",
""
],
[
"Michimura",
"Yuta",
""
],
[
"Obata",
"Ippei",
""
]
] |
Axion dark matter differentiates the phase velocities of the circular-polarized photons. In this Letter, a scheme to measure the phase difference by using a linear optical cavity is proposed. If the scheme is applied to the Fabry-P\'erot arm of Advanced LIGO-like (Cosmic-Explorer-like) gravitational wave detector, the potential sensitivity to the axion-photon coupling constant, $g_{\text{a}\gamma}$, reaches $g_{\text{a}\gamma} \simeq 8\times10^{-13}$ GeV$^{-1}\, (4 \times 10^{-14}$ GeV$^{-1})$ at the axion mass $m \simeq 3\times 10^{-13}$ eV ($2\times10^{-15}$ eV) and remains at around this sensitivity for 3 orders of magnitude in mass. Furthermore, its sensitivity has a sharp peak reaching $g_{\text{a}\gamma} \simeq 10^{-14}$ GeV$^{-1}$ $(8\times10^{-17}$ GeV$^{-1})$ at $m = 1.563\times10^{-10}$ eV ($1.563\times10^{-11}$ eV). This sensitivity can be achieved without loosing any sensitivity to gravitational waves.
|
0907.5540
|
Pablo Roig
|
P. Roig
|
Hadronic tau decays into two and three meson modes within Resonance
Chiral Theory
|
6 pages, no figures. Talk given at the Young Researchers Workshop:
"Physics Challenges in the LHC Era" held in Frascati, May 11 and 14, 2009.
Published in the Proceedings of the Workshop in the Frascati Physics Series
|
Volume XLVIII First Young Researchers Workshop "Physics Challenges
in the LHC Era" 2009 Ed. E. Nardi Frascati, May 11th and May 14th, 2009 ISBN
978-88-86409-57-5
| null |
IFIC/09-38
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study two and three meson decays of the tau lepton within the framework of
the Resonance Chiral Theory, that is based on the following properties of QCD:
its chiral symmetry in the massless case, its large-N_C limit, and the
asymptotic behaviour it demands to the relevant form factors. Most of the
couplings in the Lagrangian are determined this way rendering the theory
predictive. Our outcomes can be tested thanks to the combination of a very good
experimental effort (current and forthcoming, at B- and tau-charm-factories)
and the very accurate devoted Monte Carlo generators.
|
[
{
"created": "Fri, 31 Jul 2009 14:17:24 GMT",
"version": "v1"
}
] |
2009-08-04
|
[
[
"Roig",
"P.",
""
]
] |
We study two and three meson decays of the tau lepton within the framework of the Resonance Chiral Theory, that is based on the following properties of QCD: its chiral symmetry in the massless case, its large-N_C limit, and the asymptotic behaviour it demands to the relevant form factors. Most of the couplings in the Lagrangian are determined this way rendering the theory predictive. Our outcomes can be tested thanks to the combination of a very good experimental effort (current and forthcoming, at B- and tau-charm-factories) and the very accurate devoted Monte Carlo generators.
|
1006.2309
|
Felix Riek
|
F. Riek (1) and J\"orn Knoll (2), ((1) Texas A&M University, (2) GSI
Darmstadt)
|
Selfconsistent descriptions of vector-mesons in hot matter revisited
|
10 pages, 3 figure
|
Phys.Rev.C82:025207,2010
|
10.1103/PhysRevC.82.025207
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Technical concepts are presented that improve the selfconsistent treatment of
vector-mesons in a hot and dense medium. First applications concern an
interacting gas of pions and rho mesons. As an extension of earlier studies we
thereby include RPA-type vertex corrections and further use dispersion
relations in order to calculate the real part of the vector-meson selfenergy.
An improved projection method preserves the four transversality of the
vector-meson polarisation tensor throughout the selfconsistent calculations,
thereby keeping the scheme void of kinematical singularities.
|
[
{
"created": "Fri, 11 Jun 2010 13:39:29 GMT",
"version": "v1"
}
] |
2014-11-21
|
[
[
"Riek",
"F.",
""
],
[
"Knoll",
"Jörn",
""
]
] |
Technical concepts are presented that improve the selfconsistent treatment of vector-mesons in a hot and dense medium. First applications concern an interacting gas of pions and rho mesons. As an extension of earlier studies we thereby include RPA-type vertex corrections and further use dispersion relations in order to calculate the real part of the vector-meson selfenergy. An improved projection method preserves the four transversality of the vector-meson polarisation tensor throughout the selfconsistent calculations, thereby keeping the scheme void of kinematical singularities.
|
1402.4412
|
Andrea Quadri
|
A. Quadri
|
High-energy QCD evolution from Slavnov-Taylor identity
|
7 pages, contributed to QCD-TNT-III - From quarks and gluons to
hadronic matter: A bridge too far?, 2-6 September, 2013, European Centre for
Theoretical Studies in Nuclear Physics and Related Areas (ECT*), Villazzano,
Trento (Italy)
|
PoS(QCD-TNT-III)032, 2013
| null | null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We clarify the derivation of high-energy QCD evolution equations from the
fundamental gauge symmetry of QCD. The gauge-fixed classical action of the
Color Glass Condensate (CGC) is shown to be invariant under a suitable BRST
symmetry, that holds after the separation of the gluon modes into their fast
classical (background) part, the soft component and the semifast one, over
which the one-step quantum evolution is carried out. The resulting
Slavnov-Taylor (ST) identity holds to all orders in perturbation theory and
strongly constrains the CGC effective field theory (EFT) arising from the
integration of the soft modes. We show that the ST identity guarantees
gauge-invariance of the EFT. It also allows to control the dependence on the
gauge-fixing choice for the semifast modes (usually the lightcone gauge in
explicit computations). The formal properties of the evolution equations valid
in different regimes (BKFL, JIMWLK, ...) can be all derived in a unified
setting within this algebraic approach.
|
[
{
"created": "Tue, 18 Feb 2014 17:38:12 GMT",
"version": "v1"
}
] |
2014-02-19
|
[
[
"Quadri",
"A.",
""
]
] |
We clarify the derivation of high-energy QCD evolution equations from the fundamental gauge symmetry of QCD. The gauge-fixed classical action of the Color Glass Condensate (CGC) is shown to be invariant under a suitable BRST symmetry, that holds after the separation of the gluon modes into their fast classical (background) part, the soft component and the semifast one, over which the one-step quantum evolution is carried out. The resulting Slavnov-Taylor (ST) identity holds to all orders in perturbation theory and strongly constrains the CGC effective field theory (EFT) arising from the integration of the soft modes. We show that the ST identity guarantees gauge-invariance of the EFT. It also allows to control the dependence on the gauge-fixing choice for the semifast modes (usually the lightcone gauge in explicit computations). The formal properties of the evolution equations valid in different regimes (BKFL, JIMWLK, ...) can be all derived in a unified setting within this algebraic approach.
|
0804.4158
|
Nestor Armesto
|
N. Armesto
|
Predictions for the LHC: an Overview
|
8 pages, 3 eps figures included using graphicx; proceedings of Quark
Matter 2008 (Jaipur, India, february 4th-10th 2008)
|
J.Phys.G35:104042,2008
|
10.1088/0954-3899/35/10/104042
| null |
hep-ph nucl-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
I present an overview of predictions for the heavy ion program at the Large
Hadron Collider. It is mainly based on the material presented during the
workshop 'Heavy Ion Collisions at the LHC - Last Call for Predictions', held in
the frame of the CERN Theory Institute from May 14th to June 10th 2007.
Predictions on both bulk properties and hard probes are reviewed.
|
[
{
"created": "Fri, 25 Apr 2008 17:55:55 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Armesto",
"N.",
""
]
] |
I present an overview of predictions for the heavy ion program at the Large Hadron Collider. It is mainly based on the material presented during the workshop 'Heavy Ion Collisions at the LHC - Last Call for Predictions', held in the frame of the CERN Theory Institute from May 14th to June 10th 2007. Predictions on both bulk properties and hard probes are reviewed.
|
2211.16513
|
Jan Sch\"utte-Engel
|
Jacopo Ghiglieri, Jan Sch\"utte-Engel, Enrico Speranza
|
Freezing-In Gravitational Waves
|
18 pages, 6 figures (matches version published in Phys. Rev. D)
| null |
10.1103/PhysRevD.109.023538
| null |
hep-ph astro-ph.CO gr-qc hep-th nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The thermal plasma in the early universe produced a stochastic gravitational
wave (GW) background, which peaks today in the microwave regime and was dubbed
the cosmic gravitational microwave background (CGMB). In previous works only
single graviton production processes that contribute to the CGMB have been
considered. Here we also investigate graviton pair production processes and
show that these can lead to a significant contribution if the ratio between the
maximum temperature and the Planck mass, $T_{\rm max}/m_{\rm p}$, divided by
the internal coupling in the heat bath is large enough. As the dark matter
freeze-in production mechanism is conceptually very similar to the GW
production mechanism from the primordial thermal plasma, we refer to the latter
as ``GW freeze-in production''. We show that quantum gravity effects appear in
single graviton production and are smaller by a factor $(T_{\rm max}/m_{\rm
p})^2$ than the leading order contribution. In our work we explicitly compute
the CGMB spectrum within a scalar model with quartic interaction.
|
[
{
"created": "Tue, 29 Nov 2022 19:00:00 GMT",
"version": "v1"
},
{
"created": "Fri, 9 Feb 2024 19:38:37 GMT",
"version": "v2"
}
] |
2024-02-13
|
[
[
"Ghiglieri",
"Jacopo",
""
],
[
"Schütte-Engel",
"Jan",
""
],
[
"Speranza",
"Enrico",
""
]
] |
The thermal plasma in the early universe produced a stochastic gravitational wave (GW) background, which peaks today in the microwave regime and was dubbed the cosmic gravitational microwave background (CGMB). In previous works only single graviton production processes that contribute to the CGMB have been considered. Here we also investigate graviton pair production processes and show that these can lead to a significant contribution if the ratio between the maximum temperature and the Planck mass, $T_{\rm max}/m_{\rm p}$, divided by the internal coupling in the heat bath is large enough. As the dark matter freeze-in production mechanism is conceptually very similar to the GW production mechanism from the primordial thermal plasma, we refer to the latter as ``GW freeze-in production''. We show that quantum gravity effects appear in single graviton production and are smaller by a factor $(T_{\rm max}/m_{\rm p})^2$ than the leading order contribution. In our work we explicitly compute the CGMB spectrum within a scalar model with quartic interaction.
|
0907.2662
|
Elizabeth H. Simmons
|
Alexander S. Belyaev (Southampton U.), R. Sekhar Chivukula, Neil D.
Christensen, Elizabeth H. Simmons (Michigan State U.), Hong-Jian He (Tsinghua
U., Beijing), Masafumi Kurachi (LANL), and Masaharu Tanabashi (Nagoya U.)
|
W_L W_L Scattering in Higgsless Models: Identifying Better Effective
Theories
|
35 pages, 11 figures. References added
|
Phys.Rev.D80:055022,2009
|
10.1103/PhysRevD.80.055022
|
SHEP-09-15, MSUHEP-090715, LA-UR-09-01080, NTLP 2009-01
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The three-site model has been offered as a benchmark for studying the
collider phenomenology of Higgsless models. In this paper we analyze how well
the three-site model performs as a general exemplar of Higgsless models in
describing W_L W_L scattering, and which modifications can make it more
representative. We employ general sum rules relating the masses and couplings
of the Kaluza-Klein (KK) modes of the gauge fields in continuum and
deconstructed Higgsless models as a way to compare the different theories. We
show that the size of the four-point vertex for the (unphysical)
Nambu-Goldstone modes and the degree to which the sum rules are saturated by
contributions from the lowest-lying KK resonances both provide good measures of
the extent to which a highly-deconstructed theory can accurately describe the
low-energy physics of a continuum 5d Higgsless model. After comparing the
three-site model to flat and warped continuum models, we analyze extensions of
the three-site model to a longer open linear moose with an additional U(1)
group and to a ring ("BESS' or "hidden local symmetry") model with three sites
and three links. Both cases may be readily analyzed in the framework of the
general sum rules. We demonstrate that W_L W_L scattering in the ring model can
very closely approximate scattering in the continuum models, provided that the
hidden local symmetry parameter `a' is chosen to mimic rho-meson dominance of
pion-pion scattering in QCD. The hadron and lepton collider phenomenology of
both extended models is briefly discussed, with a focus on the complementary
information to be gained from precision measurements of the Z' line shape and
ZWW coupling at a high-energy lepton collider.
|
[
{
"created": "Wed, 15 Jul 2009 17:24:51 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Jul 2009 15:47:10 GMT",
"version": "v2"
},
{
"created": "Mon, 10 Aug 2009 19:34:14 GMT",
"version": "v3"
}
] |
2010-05-27
|
[
[
"Belyaev",
"Alexander S.",
"",
"Southampton U."
],
[
"Chivukula",
"R. Sekhar",
"",
"Michigan State U."
],
[
"Christensen",
"Neil D.",
"",
"Michigan State U."
],
[
"Simmons",
"Elizabeth H.",
"",
"Michigan State U."
],
[
"He",
"Hong-Jian",
"",
"Tsinghua\n U., Beijing"
],
[
"Kurachi",
"Masafumi",
"",
"LANL"
],
[
"Tanabashi",
"Masaharu",
"",
"Nagoya U."
]
] |
The three-site model has been offered as a benchmark for studying the collider phenomenology of Higgsless models. In this paper we analyze how well the three-site model performs as a general exemplar of Higgsless models in describing W_L W_L scattering, and which modifications can make it more representative. We employ general sum rules relating the masses and couplings of the Kaluza-Klein (KK) modes of the gauge fields in continuum and deconstructed Higgsless models as a way to compare the different theories. We show that the size of the four-point vertex for the (unphysical) Nambu-Goldstone modes and the degree to which the sum rules are saturated by contributions from the lowest-lying KK resonances both provide good measures of the extent to which a highly-deconstructed theory can accurately describe the low-energy physics of a continuum 5d Higgsless model. After comparing the three-site model to flat and warped continuum models, we analyze extensions of the three-site model to a longer open linear moose with an additional U(1) group and to a ring ("BESS' or "hidden local symmetry") model with three sites and three links. Both cases may be readily analyzed in the framework of the general sum rules. We demonstrate that W_L W_L scattering in the ring model can very closely approximate scattering in the continuum models, provided that the hidden local symmetry parameter `a' is chosen to mimic rho-meson dominance of pion-pion scattering in QCD. The hadron and lepton collider phenomenology of both extended models is briefly discussed, with a focus on the complementary information to be gained from precision measurements of the Z' line shape and ZWW coupling at a high-energy lepton collider.
|
hep-ph/9411389
|
Gino Isidori
|
G. D'Ambrosio, G. Isidori and A. Pugliese
|
CP and CPT measurements at DAFNE
|
28 pages, latex file, 7 figures added in a separate uufile
| null | null |
Rome preprint 1071, CERN-TH-7504. Contribution to the 2nd. edition
of the DAFNE Physics Handbook, eds. L. Maiani, G. Pancheri and N. Paver
|
hep-ph
| null |
Starting from the time evolution of the C-odd $\bar{K}^0 K^0$ system, we
analyze the asymmetries measurable at DAFNE and their implications on CP
violation and on the possible tests of T and CPT symmetries. In particular the
ratio $\epsilon'/\epsilon$ can be measured with high precision (up to about
$10^{-4}$ for the real part). The CP-, T- and CPT-violating parameters can be
explored in $K_S$ semileptonic decays with an accuracy of the order of
$10^{-3}$. The possibility to detect $K_S \to 3 \pi$ and $K_L \to \pi \pi
\gamma$ decays is also discussed.
|
[
{
"created": "Thu, 24 Nov 1994 17:34:13 GMT",
"version": "v1"
},
{
"created": "Fri, 25 Nov 1994 08:40:10 GMT",
"version": "v2"
}
] |
2008-02-03
|
[
[
"D'Ambrosio",
"G.",
""
],
[
"Isidori",
"G.",
""
],
[
"Pugliese",
"A.",
""
]
] |
Starting from the time evolution of the C-odd $\bar{K}^0 K^0$ system, we analyze the asymmetries measurable at DAFNE and their implications on CP violation and on the possible tests of T and CPT symmetries. In particular the ratio $\epsilon'/\epsilon$ can be measured with high precision (up to about $10^{-4}$ for the real part). The CP-, T- and CPT-violating parameters can be explored in $K_S$ semileptonic decays with an accuracy of the order of $10^{-3}$. The possibility to detect $K_S \to 3 \pi$ and $K_L \to \pi \pi \gamma$ decays is also discussed.
|
hep-ph/0106257
|
Luis Bettencourt
|
Luis M.A. Bettencourt, Krishna Rajagopal and James V. Steele
|
Langevin Evolution of Disoriented Chiral Condensate
|
19 pages, 7 figures, uses RevTex; v2 very small change to the caption
of Fig.7. Version to appear in Nucl. phys. A
|
Nucl.Phys. A693 (2001) 825-843
|
10.1016/S0375-9474(01)01242-8
|
MIT-CTP-3150
|
hep-ph hep-lat nucl-th
| null |
As the matter produced in a relativistic heavy ion collision cools through
the QCD phase transition, the dynamical evolution of the chiral condensate will
be driven out of thermal equilibrium. As a prelude to analyzing this evolution,
and in particular as a prelude to learning how rapid the cooling must be in
order for significant deviations from equilibrium to develop, we present a
detailed analysis of the time-evolution of an idealized region of disoriented
chiral condensate. We set up a Langevin field equation which can describe the
evolution of these (or more realistic) linear sigma model configurations in
contact with a heat bath representing the presence of other shorter wavelength
degrees of freedom. We first analyze the model in equilibrium, paying
particular attention to subtracting ultraviolet divergent classical terms and
replacing them by their finite quantum counterparts. We use known results from
lattice gauge theory and chiral perturbation theory to fix nonuniversal
constants. The result is a theory which is ultraviolet cutoff independent and
that reproduces quantitatively the expected equilibrium behavior of the quantum
field theory of pions and sigma fields over a wide range of temperatures.
Finally, we estimate the viscosity $\eta(T)$, which controls the dynamical
timescale in the Langevin equation, by requiring that the timescale for DCC
decay agrees with previous calculations. The resulting $\eta(T)$ is larger than
that found perturbatively. We also determine the temperature below which the
classical field Langevin equation ceases to be a good model for the quantum
field dynamics.
|
[
{
"created": "Fri, 22 Jun 2001 21:50:34 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Jul 2001 18:16:28 GMT",
"version": "v2"
}
] |
2009-11-07
|
[
[
"Bettencourt",
"Luis M. A.",
""
],
[
"Rajagopal",
"Krishna",
""
],
[
"Steele",
"James V.",
""
]
] |
As the matter produced in a relativistic heavy ion collision cools through the QCD phase transition, the dynamical evolution of the chiral condensate will be driven out of thermal equilibrium. As a prelude to analyzing this evolution, and in particular as a prelude to learning how rapid the cooling must be in order for significant deviations from equilibrium to develop, we present a detailed analysis of the time-evolution of an idealized region of disoriented chiral condensate. We set up a Langevin field equation which can describe the evolution of these (or more realistic) linear sigma model configurations in contact with a heat bath representing the presence of other shorter wavelength degrees of freedom. We first analyze the model in equilibrium, paying particular attention to subtracting ultraviolet divergent classical terms and replacing them by their finite quantum counterparts. We use known results from lattice gauge theory and chiral perturbation theory to fix nonuniversal constants. The result is a theory which is ultraviolet cutoff independent and that reproduces quantitatively the expected equilibrium behavior of the quantum field theory of pions and sigma fields over a wide range of temperatures. Finally, we estimate the viscosity $\eta(T)$, which controls the dynamical timescale in the Langevin equation, by requiring that the timescale for DCC decay agrees with previous calculations. The resulting $\eta(T)$ is larger than that found perturbatively. We also determine the temperature below which the classical field Langevin equation ceases to be a good model for the quantum field dynamics.
|
hep-ph/0603083
|
Stefano Moretti Dr
|
S. Moretti, M.R. Nolten and D.A. Ross (Southampton University)
|
Weak corrections to gluon-induced top-antitop hadro-production
|
12 pages, 4 figures, LaTeX, one figure corrected, some text changes,
conclusions unchanged, version to appear in PLB, Erratum added
|
Phys.Lett.B639:513-519,2006; Erratum-ibid.B660:607-609,2008
|
10.1016/j.physletb.2006.06.078 10.1016/j.physletb.2007.10.039
|
SHEP-06-04
|
hep-ph
| null |
We calculate purely weak virtual one-loop corrections to the production cross
section of top-antitop pairs at the Large Hadron Collider via the gluon-gluon
fusion subprocess. We find very small negative corrections to the total cross
section, of order -0.6%, but significantly larger effects to the differential
one, particularly in the transverse momentum distribution, of order -5% to -10%
(in observable regions). In case of parity-conserving spin-asymmetries of the
final state, $\alpha_{\mathrm{S}}^2\alpha_{\mathrm{W}}$ corrections are
typically of a few negative percent, with the exception of positive and
negative peaks at $+12%$ and -5%, respectively (near where the tree-level
predictions change sign), while those arising in parity-violating asymmetries
(which are identically zero in QCD) are typically at a level of a few permille.
|
[
{
"created": "Fri, 10 Mar 2006 19:29:28 GMT",
"version": "v1"
},
{
"created": "Fri, 30 Jun 2006 08:31:48 GMT",
"version": "v2"
},
{
"created": "Thu, 8 Nov 2007 18:57:46 GMT",
"version": "v3"
}
] |
2008-11-26
|
[
[
"Moretti",
"S.",
"",
"Southampton University"
],
[
"Nolten",
"M. R.",
"",
"Southampton University"
],
[
"Ross",
"D. A.",
"",
"Southampton University"
]
] |
We calculate purely weak virtual one-loop corrections to the production cross section of top-antitop pairs at the Large Hadron Collider via the gluon-gluon fusion subprocess. We find very small negative corrections to the total cross section, of order -0.6%, but significantly larger effects to the differential one, particularly in the transverse momentum distribution, of order -5% to -10% (in observable regions). In case of parity-conserving spin-asymmetries of the final state, $\alpha_{\mathrm{S}}^2\alpha_{\mathrm{W}}$ corrections are typically of a few negative percent, with the exception of positive and negative peaks at $+12%$ and -5%, respectively (near where the tree-level predictions change sign), while those arising in parity-violating asymmetries (which are identically zero in QCD) are typically at a level of a few permille.
|
1209.2214
|
YaJin Zhou
|
Hao Sun and Ya-Jin Zhou
|
Neutral Triple Gauge Boson production in the large extra dimensions
model at linear colliders
|
17 pages,8 figures, accepted by Phys. Rev. D
| null |
10.1103/PhysRevD.86.075003
| null |
hep-ph
|
http://creativecommons.org/licenses/by/3.0/
|
We consider the neutral triple gauge boson production process in the context
of large extra dimensions (LED) model including the Kaluza-Klein (KK) excited
gravitons at future linear colliders, say ILC(CLIC). We consider
$\gamma\gamma\gamma, \gamma\gamma Z, \gamma Z Z$ and $ZZZ$ production
processes, and analyse their impacts on both the total cross section and some
key distributions. These processes are important for new physics searches at
linear colliders. Our results show that KK graviton exchange has the most
significant effect on \eerzz among the four processes with relatively small
$M_S$, while it has the largest effect on \eerrr with larger $M_S$. By using
the neutral triple gauge boson production we could set the discovery limit on
the fundamental Plank scale $M_S$ up to around 6-9 TeV for $\delta$ = 4 at the
3 TeV CLIC.
|
[
{
"created": "Tue, 11 Sep 2012 03:42:25 GMT",
"version": "v1"
}
] |
2015-06-11
|
[
[
"Sun",
"Hao",
""
],
[
"Zhou",
"Ya-Jin",
""
]
] |
We consider the neutral triple gauge boson production process in the context of large extra dimensions (LED) model including the Kaluza-Klein (KK) excited gravitons at future linear colliders, say ILC(CLIC). We consider $\gamma\gamma\gamma, \gamma\gamma Z, \gamma Z Z$ and $ZZZ$ production processes, and analyse their impacts on both the total cross section and some key distributions. These processes are important for new physics searches at linear colliders. Our results show that KK graviton exchange has the most significant effect on \eerzz among the four processes with relatively small $M_S$, while it has the largest effect on \eerrr with larger $M_S$. By using the neutral triple gauge boson production we could set the discovery limit on the fundamental Plank scale $M_S$ up to around 6-9 TeV for $\delta$ = 4 at the 3 TeV CLIC.
|
2101.00047
|
Sabya Sachi Chatterjee
|
Francesco Capozzi, Sabya Sachi Chatterjee, and Antonio Palazzo
|
Neutrino mass ordering obfuscated by the NSI
|
Contribution to ICHEP2020, accepted for publication on PoS
| null | null | null |
hep-ph hep-ex hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Determination of the neutrino mass ordering (NMO) is one of the biggest
priorities in the intensity frontier of high energy particle physics. To
accomplish that goal a lot of efforts are being put together with the
atmospheric, solar, reactor, and accelerator neutrinos. In the standard
3-flavor framework, NMO is defined to be normal if $m_1<m_2<m_3$, and inverted
if $m_3<m_1<m_2$, where $m_1$, $m_2$, and $m_3$ are the masses of the three
neutrino mass eigenstates $\nu_1$, $\nu_2$, and $\nu_3$ respectively.
Interestingly, two long-baseline experiments T2K and NO$\nu$A are playing a
leading role in this direction and provide a $\sim2.4\sigma$ indication in
favor of normal ordering (NO) which we find in this work. In addition, we
examine how the situation looks like in presence of non-standard interactions
(NSI) of neutrinos with a special focus on the non-diagonal flavor changing
type $\varepsilon_{e\tau}$ and $\varepsilon_{e\mu}$. We find that the present
indication of NO in the standard 3-flavor framework gets completely vanished in
the presence of NSI of the flavor changing type involving the $e-\tau$ flavors.
|
[
{
"created": "Thu, 31 Dec 2020 19:25:16 GMT",
"version": "v1"
}
] |
2021-01-05
|
[
[
"Capozzi",
"Francesco",
""
],
[
"Chatterjee",
"Sabya Sachi",
""
],
[
"Palazzo",
"Antonio",
""
]
] |
Determination of the neutrino mass ordering (NMO) is one of the biggest priorities in the intensity frontier of high energy particle physics. To accomplish that goal a lot of efforts are being put together with the atmospheric, solar, reactor, and accelerator neutrinos. In the standard 3-flavor framework, NMO is defined to be normal if $m_1<m_2<m_3$, and inverted if $m_3<m_1<m_2$, where $m_1$, $m_2$, and $m_3$ are the masses of the three neutrino mass eigenstates $\nu_1$, $\nu_2$, and $\nu_3$ respectively. Interestingly, two long-baseline experiments T2K and NO$\nu$A are playing a leading role in this direction and provide a $\sim2.4\sigma$ indication in favor of normal ordering (NO) which we find in this work. In addition, we examine how the situation looks like in presence of non-standard interactions (NSI) of neutrinos with a special focus on the non-diagonal flavor changing type $\varepsilon_{e\tau}$ and $\varepsilon_{e\mu}$. We find that the present indication of NO in the standard 3-flavor framework gets completely vanished in the presence of NSI of the flavor changing type involving the $e-\tau$ flavors.
|
hep-ph/9912450
| null |
Alakabha Datta and Xinmin Zhang
|
Vacuum Stability Higgs Mass Bound Revisited with Implications for Extra
Dimension Theories
|
Latex, 14 pages, 1 figure. Added references. To appear in Phys. Rev.
D
|
Phys.Rev. D61 (2000) 074033
|
10.1103/PhysRevD.61.074033
|
UT-PT-99-18
|
hep-ph hep-ex
| null |
We take the standard model to be an effective theory including higher
dimensional operators suppressed by scale $\Lambda$ and re-examine the higgs
mass bounds from the requirements of vacuum stability. Our results show that
the effects of the higher dimensional operators on the higgs mass limits are
significant. As an implication of our results, we study the vacuum stability
higgs mass bounds in theories with extra dimensions.
|
[
{
"created": "Tue, 21 Dec 1999 18:56:28 GMT",
"version": "v1"
},
{
"created": "Sat, 8 Jan 2000 18:34:07 GMT",
"version": "v2"
}
] |
2009-10-31
|
[
[
"Datta",
"Alakabha",
""
],
[
"Zhang",
"Xinmin",
""
]
] |
We take the standard model to be an effective theory including higher dimensional operators suppressed by scale $\Lambda$ and re-examine the higgs mass bounds from the requirements of vacuum stability. Our results show that the effects of the higher dimensional operators on the higgs mass limits are significant. As an implication of our results, we study the vacuum stability higgs mass bounds in theories with extra dimensions.
|
2304.00908
|
Ke-Pan Xie
|
Xiao-Rui Wang and Ke-Pan Xie
|
Freeze-in of WIMP dark matter
|
5 pages + 3 figures + appendix + references
| null | null | null |
hep-ph astro-ph.CO
|
http://creativecommons.org/licenses/by/4.0/
|
The nature of dark matter (DM) remains one of the most important unanswered
questions in particle physics. Here, we propose a novel scenario for DM in
which weakly interacting massive particles (WIMPs) can freeze-in due to a
first-order phase transition (FOPT) in the early Universe. The FOPT dilutes the
pre-existing DM density to zero and leads to a sudden change in DM mass,
preventing WIMPs from re-equilibrating due to their large mass-to-temperature
ratio. Following the FOPT, WIMPs are produced via a freeze-in process, even
though their interactions are NOT feeble. We demonstrate this concept using a
simplified model and then apply it to a realistic model with a delayed
electroweak phase transition. Our work presents a promising new direction for
the freeze-in mechanism, and also extends the category of WIMP DM.
|
[
{
"created": "Mon, 3 Apr 2023 11:55:39 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Apr 2023 13:01:02 GMT",
"version": "v2"
},
{
"created": "Thu, 14 Sep 2023 06:13:06 GMT",
"version": "v3"
}
] |
2023-09-15
|
[
[
"Wang",
"Xiao-Rui",
""
],
[
"Xie",
"Ke-Pan",
""
]
] |
The nature of dark matter (DM) remains one of the most important unanswered questions in particle physics. Here, we propose a novel scenario for DM in which weakly interacting massive particles (WIMPs) can freeze-in due to a first-order phase transition (FOPT) in the early Universe. The FOPT dilutes the pre-existing DM density to zero and leads to a sudden change in DM mass, preventing WIMPs from re-equilibrating due to their large mass-to-temperature ratio. Following the FOPT, WIMPs are produced via a freeze-in process, even though their interactions are NOT feeble. We demonstrate this concept using a simplified model and then apply it to a realistic model with a delayed electroweak phase transition. Our work presents a promising new direction for the freeze-in mechanism, and also extends the category of WIMP DM.
|
hep-ph/0007104
|
Roberto Casalbuoni
|
Roberto Casalbuoni
|
The impact of atomic precision measurements in high energy physics
|
Talk given at the XVII International Conference on Atomic Physics,
ICAP 2000, Florence, June 4-9, 2000. LaTeX, p.16. A sentence and a reference
have been modified
| null |
10.1063/1.1354353
| null |
hep-ph physics.atom-ph
| null |
In this talk I discuss the relevance of atomic physics in understanding some
important questions about elementary particle physics. A particular attention
is devoted to atomic parity violation measurements which seem to suggest new
physics beyond the Standard Model. Atomic physics might also be relevant in
discovering possible violations of the CPT symmetry.
|
[
{
"created": "Tue, 11 Jul 2000 14:55:53 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Jul 2000 07:34:51 GMT",
"version": "v2"
}
] |
2009-10-31
|
[
[
"Casalbuoni",
"Roberto",
""
]
] |
In this talk I discuss the relevance of atomic physics in understanding some important questions about elementary particle physics. A particular attention is devoted to atomic parity violation measurements which seem to suggest new physics beyond the Standard Model. Atomic physics might also be relevant in discovering possible violations of the CPT symmetry.
|
2005.07047
|
Kensuke Akita
|
Kensuke Akita, Masahide Yamaguchi
|
A precision calculation of relic neutrino decoupling
|
31 pages, 5 figures and 4 tables, accepted JCAP version
| null |
10.1088/1475-7516/2020/08/012
| null |
hep-ph astro-ph.CO
|
http://creativecommons.org/licenses/by/4.0/
|
We study the distortions of equilibrium spectra of relic neutrinos due to the
interactions with electrons, positrons, and neutrinos in the early Universe. We
solve the integro-differential kinetic equations for the neutrino density
matrix, including three-flavor oscillations and finite temperature corrections
from QED up to the next-to-leading order $\mathcal{O}(e^3)$ for the first time.
In addition, the equivalent kinetic equations in the mass basis of neutrinos
are directly solved, and we numerically evaluate the distortions of the
neutrino spectra in the mass basis as well, which can be easily extrapolated
into those for non-relativistic neutrinos in the current Universe. In both
bases, we find the same value of the effective number of neutrinos, $N_{\rm
eff} = 3.044$, which parameterizes the total neutrino energy density. The
estimated error for the value of $N_{\rm eff}$ due to the numerical
calculations and the choice of neutrino mixing parameters would be at most
0.0005.
|
[
{
"created": "Thu, 14 May 2020 14:56:02 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Aug 2020 15:42:22 GMT",
"version": "v2"
}
] |
2020-08-19
|
[
[
"Akita",
"Kensuke",
""
],
[
"Yamaguchi",
"Masahide",
""
]
] |
We study the distortions of equilibrium spectra of relic neutrinos due to the interactions with electrons, positrons, and neutrinos in the early Universe. We solve the integro-differential kinetic equations for the neutrino density matrix, including three-flavor oscillations and finite temperature corrections from QED up to the next-to-leading order $\mathcal{O}(e^3)$ for the first time. In addition, the equivalent kinetic equations in the mass basis of neutrinos are directly solved, and we numerically evaluate the distortions of the neutrino spectra in the mass basis as well, which can be easily extrapolated into those for non-relativistic neutrinos in the current Universe. In both bases, we find the same value of the effective number of neutrinos, $N_{\rm eff} = 3.044$, which parameterizes the total neutrino energy density. The estimated error for the value of $N_{\rm eff}$ due to the numerical calculations and the choice of neutrino mixing parameters would be at most 0.0005.
|
hep-ph/0111074
|
Katsumi Ohwa
|
K. Ohwa (Tokyo Metropolitan University)
|
Crystalline ground state in chiral Gross-Neveu and Cooper pair models at
finite densities
|
18 pages, REVTeX, 3 eps figures
|
Phys.Rev. D65 (2002) 085040
|
10.1103/PhysRevD.65.085040
| null |
hep-ph
| null |
We study the possibility of spatially non-uniform ground state in
(1+1)-dimensional models with quartic fermi interactions at finite fermion
densities by introducing chemical potential \mu. We examine the chiral
Gross-Neveu model and the Cooper pair model as toy models of the chiral
symmetry breaking and the difermion pair condensates which are presumed to
exist in QCD. We confirm in the chiral Gross-Neveu model that the ground state
has a crystalline structure in which the chiral condensate oscillates in space
with wave number 2\mu. Whereas in the Cooper pair model we find that the vacuum
structure is spatially uniform. Some discussions are given to explain this
difference.
|
[
{
"created": "Wed, 7 Nov 2001 13:44:21 GMT",
"version": "v1"
},
{
"created": "Sat, 19 Jan 2002 07:49:56 GMT",
"version": "v2"
}
] |
2009-11-07
|
[
[
"Ohwa",
"K.",
"",
"Tokyo Metropolitan University"
]
] |
We study the possibility of spatially non-uniform ground state in (1+1)-dimensional models with quartic fermi interactions at finite fermion densities by introducing chemical potential \mu. We examine the chiral Gross-Neveu model and the Cooper pair model as toy models of the chiral symmetry breaking and the difermion pair condensates which are presumed to exist in QCD. We confirm in the chiral Gross-Neveu model that the ground state has a crystalline structure in which the chiral condensate oscillates in space with wave number 2\mu. Whereas in the Cooper pair model we find that the vacuum structure is spatially uniform. Some discussions are given to explain this difference.
|
hep-ph/0407133
|
Kazunori Itakura
|
K.Naito, S.Maedan, and K.Itakura
|
Light Mesons on the Light Front
|
34 pages, 5 figures, minor modification, to appear in Phys. Rev. D
|
Phys.Rev. D70 (2004) 096008
|
10.1103/PhysRevD.70.096008
|
SACLAY-T04/096
|
hep-ph
| null |
We study the properties of light mesons in the scalar, pseudo-scalar, and
vector channels within the light-front quantization, by using the (one flavor)
Nambu--Jona-Lasinio model with vector interaction. After taking into account
the effects of chiral symmetry breaking, we derive the bound-state equation in
each channel in the large N limit (N is the number of colors), which means that
we consider the lowest q\bar{q} Fock state with the constituent quark and
antiquark. By solving the bound-state equation, we simultaneously obtain a mass
and a light-cone (LC) wavefunction of the meson. While we reproduce the
previous results for the scalar and pseudo-scalar mesons, we find that, for a
vector meson, the bound-state equations for the transverse and longitudinal
polarizations look different from each other. However, eventually after
imposing a cutoff which is invariant under the parity and boost
transformations, one finds these two are identical, giving the same mass and
the same (spin-independent) LC wavefunction. When the vector interaction
becomes larger than a critical value, the vector state forms a bound state,
whose mass decreases as the interaction becomes stronger. While the LC
wavefunction of the pseudo-scalar meson is broadly distributed in longitudinal
momentum (x) space, that of the vector meson is squeezed around x=1/2.
|
[
{
"created": "Mon, 12 Jul 2004 12:33:14 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Oct 2004 17:24:03 GMT",
"version": "v2"
}
] |
2009-11-10
|
[
[
"Naito",
"K.",
""
],
[
"Maedan",
"S.",
""
],
[
"Itakura",
"K.",
""
]
] |
We study the properties of light mesons in the scalar, pseudo-scalar, and vector channels within the light-front quantization, by using the (one flavor) Nambu--Jona-Lasinio model with vector interaction. After taking into account the effects of chiral symmetry breaking, we derive the bound-state equation in each channel in the large N limit (N is the number of colors), which means that we consider the lowest q\bar{q} Fock state with the constituent quark and antiquark. By solving the bound-state equation, we simultaneously obtain a mass and a light-cone (LC) wavefunction of the meson. While we reproduce the previous results for the scalar and pseudo-scalar mesons, we find that, for a vector meson, the bound-state equations for the transverse and longitudinal polarizations look different from each other. However, eventually after imposing a cutoff which is invariant under the parity and boost transformations, one finds these two are identical, giving the same mass and the same (spin-independent) LC wavefunction. When the vector interaction becomes larger than a critical value, the vector state forms a bound state, whose mass decreases as the interaction becomes stronger. While the LC wavefunction of the pseudo-scalar meson is broadly distributed in longitudinal momentum (x) space, that of the vector meson is squeezed around x=1/2.
|
2209.06047
|
Alexander Korchin
|
Sw. Banerjee, A.Yu. Korchin, Z. Was
|
Spin correlations in $\tau$-lepton pair production due to anomalous
magnetic and electric dipole moments
|
17 pages, 2 figures
| null |
10.1103/PhysRevD.106.113010
|
IFJ-PAN-IV-2022-12
|
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We present a simple algorithm for the calculation of event weights embedding
the effects of anomalous electric and magnetic dipole moments in simulation of
$e^-e^+\to \tau^-\tau^+ (n\gamma)$ events, and the subsequent decay of the
$\tau$ leptons produced. The impact of these weights on the spin-correlation
matrix and the total cross-section is taken into account. The algorithm is
prepared to work in-situ the {\tt KKMC} Monte Carlo, without the need for
introducing any external change to the generator libraries.
As an example, $e^-e^+ \to \tau^-\tau^+ (n\gamma), \; \tau^- \to \rho^-
\nu_\tau \to \pi^- \pi^0 \nu_\tau, \ \tau^+ \to \rho^+ \bar{\nu}_\tau \to \pi^+
\pi^0 \bar{\nu}_\tau$ events were simulated at a center-of-mass energy of 10.58
GeV. The distributions of the acoplanarity angle between the planes spanned by
the $\pi^- \pi^0$ and the $\pi^+ \pi^0$ momenta of respectively $\rho^-$ and
$\rho^+$ decays and in the rest-frame of the entirely visible $\rho^-\rho^+$
system, are presented for different values of the coupling constants
incorporating anomalous electric and magnetic dipole moments in the $\tau^-
\tau^+ \gamma$ vertex.
|
[
{
"created": "Tue, 13 Sep 2022 14:55:58 GMT",
"version": "v1"
}
] |
2023-01-11
|
[
[
"Banerjee",
"Sw.",
""
],
[
"Korchin",
"A. Yu.",
""
],
[
"Was",
"Z.",
""
]
] |
We present a simple algorithm for the calculation of event weights embedding the effects of anomalous electric and magnetic dipole moments in simulation of $e^-e^+\to \tau^-\tau^+ (n\gamma)$ events, and the subsequent decay of the $\tau$ leptons produced. The impact of these weights on the spin-correlation matrix and the total cross-section is taken into account. The algorithm is prepared to work in-situ the {\tt KKMC} Monte Carlo, without the need for introducing any external change to the generator libraries. As an example, $e^-e^+ \to \tau^-\tau^+ (n\gamma), \; \tau^- \to \rho^- \nu_\tau \to \pi^- \pi^0 \nu_\tau, \ \tau^+ \to \rho^+ \bar{\nu}_\tau \to \pi^+ \pi^0 \bar{\nu}_\tau$ events were simulated at a center-of-mass energy of 10.58 GeV. The distributions of the acoplanarity angle between the planes spanned by the $\pi^- \pi^0$ and the $\pi^+ \pi^0$ momenta of respectively $\rho^-$ and $\rho^+$ decays and in the rest-frame of the entirely visible $\rho^-\rho^+$ system, are presented for different values of the coupling constants incorporating anomalous electric and magnetic dipole moments in the $\tau^- \tau^+ \gamma$ vertex.
|
hep-ph/9209291
| null |
Howard Georgi
|
$D$-$\bar D$ Mixing in Heavy Quark Effective Field Theory
|
10 pages (big mode), #HUTP-92/A049
|
Phys.Lett.B297:353-357,1992
|
10.1016/0370-2693(92)91274-D
| null |
hep-ph
| null |
I analyze $D$-$\ol D$ mixing using the techniques of heavy quark effect field
theory. The analysis suggests that the there may be important cancellations
among the dispersive effects of different kinds of final states, so that the
total mixing may be considerably smaller than previous estimates.
|
[
{
"created": "Tue, 29 Sep 1992 22:30:03 GMT",
"version": "v1"
}
] |
2009-09-11
|
[
[
"Georgi",
"Howard",
""
]
] |
I analyze $D$-$\ol D$ mixing using the techniques of heavy quark effect field theory. The analysis suggests that the there may be important cancellations among the dispersive effects of different kinds of final states, so that the total mixing may be considerably smaller than previous estimates.
|
2311.04751
|
Xu-Dong Huang
|
Xu-Dong Huang, Bin Gong, Rui-Chang Niu, Huai-Min Yu, Jian-Xiong Wang
|
Next-to-next-to-leading-order QCD corrections to double $J/\psi$
production at the $B$ factories
|
15 pages, 3 figures, matches published version
|
JHEP 02 (2024) 055
|
10.1007/JHEP02(2024)055
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper, we study the next-to-next-to-leading-order (NNLO) QCD
corrections for the process $e^+e^- \to J/\psi+J/\psi$ at the $B$ factories. By
including the NNLO corrections, the cross section turns negative due to the
poor convergence of perturbative expansion. Consequently, to obtain a
reasonable estimation for the cross section, the square of the amplitude up to
NNLO is used. In addition, the contributions from the bottom quark and the
light-by-light part, which are usually neglected, are also included. The final
cross section is obtained as $1.76^{+2.42}_{-1.66} ~{\rm fb}$ at a
center-of-mass energy of $\sqrt{s}=10.58$ GeV. Our result for total cross
section and differential cross section could be compared with precise
experimental measurement in future at the $B$ factories.
|
[
{
"created": "Wed, 8 Nov 2023 15:21:23 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Feb 2024 03:27:34 GMT",
"version": "v2"
}
] |
2024-02-13
|
[
[
"Huang",
"Xu-Dong",
""
],
[
"Gong",
"Bin",
""
],
[
"Niu",
"Rui-Chang",
""
],
[
"Yu",
"Huai-Min",
""
],
[
"Wang",
"Jian-Xiong",
""
]
] |
In this paper, we study the next-to-next-to-leading-order (NNLO) QCD corrections for the process $e^+e^- \to J/\psi+J/\psi$ at the $B$ factories. By including the NNLO corrections, the cross section turns negative due to the poor convergence of perturbative expansion. Consequently, to obtain a reasonable estimation for the cross section, the square of the amplitude up to NNLO is used. In addition, the contributions from the bottom quark and the light-by-light part, which are usually neglected, are also included. The final cross section is obtained as $1.76^{+2.42}_{-1.66} ~{\rm fb}$ at a center-of-mass energy of $\sqrt{s}=10.58$ GeV. Our result for total cross section and differential cross section could be compared with precise experimental measurement in future at the $B$ factories.
|
0706.2276
|
Sebastian Sapeta
|
S. Sapeta
|
Heavy Flavor Production in DGLAP improved Saturation Model
|
4 pages, 3 figures; Talk presented at the International Workshop on
Deep-Inelastic Scattering and Related Subjects, Munich, Germany, April 16-20,
2007
| null | null |
CERN-PH-TH/2007-101
|
hep-ph
| null |
The saturation model with DGLAP evolution is shown to give good description
of the production of the charm and beauty quarks in deep inelastic scattering.
The modifications of saturation properties caused by the presence of heavy
quarks are also discussed.
|
[
{
"created": "Fri, 15 Jun 2007 11:51:29 GMT",
"version": "v1"
}
] |
2007-06-18
|
[
[
"Sapeta",
"S.",
""
]
] |
The saturation model with DGLAP evolution is shown to give good description of the production of the charm and beauty quarks in deep inelastic scattering. The modifications of saturation properties caused by the presence of heavy quarks are also discussed.
|
1911.10956
|
Dmitry Borisyuk
|
Dmitry Borisyuk, Alexander Kobushkin
|
Two photon exchange in elastic electron scattering off hadronic systems
|
28 pages, 12 figures
|
Ukr.J.Phys. 66, No. 1, 3 (2021)
|
10.15407/ujpe66.1.3
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In the present review we discuss different aspects of the two-photon exchange
(TPE) physics in elastic $ep$ scattering, at high $Q^2$ as well as at low
$Q^2$. The imaginary part of the TPE amplitude gives rise to beam and target
single-spin asymmetries. Different theoretical approaches to calculation of
these observables are considered. The real part of the TPE amplitude influence
unpolarized cross section and double-spin observables and is, most likely,
responsible for discrepancy between two methods of proton form factors
measurements. We review different methods of calculations of the TPE amplitudes
the framework of "hadron" and "quark-gluon" approaches. We discuss the
dispersion approach suitable for low and intermediate $Q^2$, which includes
elastic and inelastic intermediate hadronic states, as well as connection of
TPE to proton radius puzzle. The present situation with direct experimental
searches for the TPE amplitude in $e^+p/e^-p$ charge asymmetry is also
discussed, as well as attempts to extract the TPE amplitudes from existing
experimental data obtained by the Rosenbluth and double polarization
techniques. The TPE physics in other processes, such as elastic $\mu p$,
$e$-nucleus and $e\pi$ scattering is also reviewed.
|
[
{
"created": "Mon, 25 Nov 2019 14:57:10 GMT",
"version": "v1"
}
] |
2021-03-29
|
[
[
"Borisyuk",
"Dmitry",
""
],
[
"Kobushkin",
"Alexander",
""
]
] |
In the present review we discuss different aspects of the two-photon exchange (TPE) physics in elastic $ep$ scattering, at high $Q^2$ as well as at low $Q^2$. The imaginary part of the TPE amplitude gives rise to beam and target single-spin asymmetries. Different theoretical approaches to calculation of these observables are considered. The real part of the TPE amplitude influence unpolarized cross section and double-spin observables and is, most likely, responsible for discrepancy between two methods of proton form factors measurements. We review different methods of calculations of the TPE amplitudes the framework of "hadron" and "quark-gluon" approaches. We discuss the dispersion approach suitable for low and intermediate $Q^2$, which includes elastic and inelastic intermediate hadronic states, as well as connection of TPE to proton radius puzzle. The present situation with direct experimental searches for the TPE amplitude in $e^+p/e^-p$ charge asymmetry is also discussed, as well as attempts to extract the TPE amplitudes from existing experimental data obtained by the Rosenbluth and double polarization techniques. The TPE physics in other processes, such as elastic $\mu p$, $e$-nucleus and $e\pi$ scattering is also reviewed.
|
1110.3805
|
Michael E. Peskin
|
Michael E. Peskin
|
Summary of Lepton Photon 2011
|
56 pages, 37 figures; v2: minor corrections to references
| null |
10.1007/s12043-012-0424-0
|
SLAC-PUB-14612
|
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this lecture, I summarize developments presented at the Lepton Photon 2011
conference and give my perspective on the current situation in high-energy
physics.
|
[
{
"created": "Mon, 17 Oct 2011 20:13:40 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Nov 2011 19:18:44 GMT",
"version": "v2"
}
] |
2015-05-30
|
[
[
"Peskin",
"Michael E.",
""
]
] |
In this lecture, I summarize developments presented at the Lepton Photon 2011 conference and give my perspective on the current situation in high-energy physics.
|
1705.00929
|
Paride Paradisi
|
Ferruccio Feruglio, Paride Paradisi, Andrea Pattori
|
On the Importance of Electroweak Corrections for B Anomalies
|
38 pages, 7 figures. V2: Text improvments. Published version
| null |
10.1007/JHEP09(2017)061
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The growing experimental indication of Lepton Flavour Universality Violation
(LFUV) both in charged- and neutral-current semileptonic B-decays, has
triggered many theoretical interpretations of such non-standard phenomena.
Focusing on popular scenarios where the explanation of these anomalies requires
New Physics at the TeV scale, we emphasise the importance of including
electroweak corrections to obtain trustable predictions for the models in
question. We find that the most important quantum effects are the modifications
of the leptonic couplings of the W and Z vector bosons and the generation of a
purely leptonic effective Lagrangian. As a result, the tight experimental
bounds on Z-pole observables and tau decays challenge an explanation of the
current non-standard data. We illustrate how these effects arise, by providing
a detailed discussion of the running and matching procedure which is necessary
to derive the low-energy effective Lagrangian.
|
[
{
"created": "Tue, 2 May 2017 12:02:18 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Nov 2017 13:20:39 GMT",
"version": "v2"
}
] |
2017-11-27
|
[
[
"Feruglio",
"Ferruccio",
""
],
[
"Paradisi",
"Paride",
""
],
[
"Pattori",
"Andrea",
""
]
] |
The growing experimental indication of Lepton Flavour Universality Violation (LFUV) both in charged- and neutral-current semileptonic B-decays, has triggered many theoretical interpretations of such non-standard phenomena. Focusing on popular scenarios where the explanation of these anomalies requires New Physics at the TeV scale, we emphasise the importance of including electroweak corrections to obtain trustable predictions for the models in question. We find that the most important quantum effects are the modifications of the leptonic couplings of the W and Z vector bosons and the generation of a purely leptonic effective Lagrangian. As a result, the tight experimental bounds on Z-pole observables and tau decays challenge an explanation of the current non-standard data. We illustrate how these effects arise, by providing a detailed discussion of the running and matching procedure which is necessary to derive the low-energy effective Lagrangian.
|
hep-ph/0703065
|
Gabor Papp
|
Gabor Papp, Peter Levai, George Fai
|
Intrinsic transverse momentum in di-hadron correlations
|
6 pages, 4 figures, QM2006 proceeding
| null | null | null |
hep-ph
| null |
We study di-hadron correlations in proton-proton collisions at $\sqrt{s} =
200$ GeV and interpret experimental data in terms of a fragmentation width and
a momentum imbalance. A fragmentation width of $580 \pm 50$ GeV/c is obtained,
and the measured momentum imbalance gives an `intrinsic' transverse momentum
width of partons in the proton of $2.6 \pm 0.2$ GeV/c. Consequences to heavy
ion collisions are discussed.
|
[
{
"created": "Tue, 6 Mar 2007 09:45:25 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Papp",
"Gabor",
""
],
[
"Levai",
"Peter",
""
],
[
"Fai",
"George",
""
]
] |
We study di-hadron correlations in proton-proton collisions at $\sqrt{s} = 200$ GeV and interpret experimental data in terms of a fragmentation width and a momentum imbalance. A fragmentation width of $580 \pm 50$ GeV/c is obtained, and the measured momentum imbalance gives an `intrinsic' transverse momentum width of partons in the proton of $2.6 \pm 0.2$ GeV/c. Consequences to heavy ion collisions are discussed.
|
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.