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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1312.2837 | Elaine Fortes | Elaine C. F. S. Fortes and M. D. Tonasse | Low Mass Pseudoscalar Dark Matter in an Extended B - L Model | Version submitted and accepted for publication in PRD | null | 10.1103/PhysRevD.89.016015 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study an extended B-L model, which has in its structure four neutral
scalars. In this model, a representative set of parameters enable us to
conclude that one of these scalars is a promising candidate for low-mass dark
matter. We introduce an Z_2 symmetry, which ensure the stability of the dark
matter. The dominant annihilation process will be through $s$-channel exchange
of a scalar in $b\overline{b}$. So, this is also a Higgs portal dark matter
model, but the Higgs decay to dark matter is suppressed and meets the
constraints from invisible decays of Higgs boson. The model is also in
agreement with the constraints established by XENON100, CoGeNT and CDMS
experiments, maching the relic abundance and the cross section with nucleon.
| [
{
"created": "Tue, 10 Dec 2013 15:43:45 GMT",
"version": "v1"
}
] | 2015-06-18 | [
[
"Fortes",
"Elaine C. F. S.",
""
],
[
"Tonasse",
"M. D.",
""
]
] | We study an extended B-L model, which has in its structure four neutral scalars. In this model, a representative set of parameters enable us to conclude that one of these scalars is a promising candidate for low-mass dark matter. We introduce an Z_2 symmetry, which ensure the stability of the dark matter. The dominant annihilation process will be through $s$-channel exchange of a scalar in $b\overline{b}$. So, this is also a Higgs portal dark matter model, but the Higgs decay to dark matter is suppressed and meets the constraints from invisible decays of Higgs boson. The model is also in agreement with the constraints established by XENON100, CoGeNT and CDMS experiments, maching the relic abundance and the cross section with nucleon. |
0903.5228 | Paul Frampton | Paul H. Frampton | T' and the Cabibbo Angle | 8 pages, Talk at 75 Years Since Solvay. Singapore. November 2008 | Int.J.Mod.Phys.A24:3359-3365,2009 | 10.1142/S0217751X09046953 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The use of the binary tetrahedral group ($T^{'}$) as flavor symmetry is
discussed. I emphasize the CKM quark and PMNS neutrino mixings. I present a
novel formula for the Cabibbo angle.
| [
{
"created": "Mon, 30 Mar 2009 14:12:52 GMT",
"version": "v1"
}
] | 2009-08-20 | [
[
"Frampton",
"Paul H.",
""
]
] | The use of the binary tetrahedral group ($T^{'}$) as flavor symmetry is discussed. I emphasize the CKM quark and PMNS neutrino mixings. I present a novel formula for the Cabibbo angle. |
1303.3752 | Alka Upadhyay | M. Batra, A. Upadhyay | Sea Quark and Gluon contributions to Strange Baryons and their
Properties | 4 pages, IOP Proceedings(2013) | Journal of Physics: Conference Series 481 (2014) 012024 | 10.1088/1742-6596/481/1/012024 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We treat the hadrons as an ensemble of quark-gluon Fock states where
contributions from sea-quarks and gluons can be studied in detail for the
properties of low lying baryons. Statistical model is applied to calculate
individual probabilities from various scalar, vector and tensor sea components
in flavor, spin and color subspaces for each quark-gluon Fock state. The mass
of strange quark is imposed in terms of constraints to the availability of
strange quarks in the sea and free energy of gluons in conformity with
experimental indications. We calculate multiplicities for different sets of
Fock states to compute the role of strange sea for cascade doublet {\Xi}+, and
{\Xi}-.The low energy properties like magnetic moment, weak decay matrix
elements and axial coupling constant ratios have been studied. The
incorporation of strange quark gluon sea is discussed and they found to affect
the results by almost 46% . The results provide deeper understanding for baryon
structure thereby motivating experiments for further inspection, especially the
spin distribution among the quarks and gluons.
| [
{
"created": "Fri, 15 Mar 2013 12:18:24 GMT",
"version": "v1"
},
{
"created": "Sat, 16 Nov 2013 03:46:48 GMT",
"version": "v2"
}
] | 2014-03-07 | [
[
"Batra",
"M.",
""
],
[
"Upadhyay",
"A.",
""
]
] | We treat the hadrons as an ensemble of quark-gluon Fock states where contributions from sea-quarks and gluons can be studied in detail for the properties of low lying baryons. Statistical model is applied to calculate individual probabilities from various scalar, vector and tensor sea components in flavor, spin and color subspaces for each quark-gluon Fock state. The mass of strange quark is imposed in terms of constraints to the availability of strange quarks in the sea and free energy of gluons in conformity with experimental indications. We calculate multiplicities for different sets of Fock states to compute the role of strange sea for cascade doublet {\Xi}+, and {\Xi}-.The low energy properties like magnetic moment, weak decay matrix elements and axial coupling constant ratios have been studied. The incorporation of strange quark gluon sea is discussed and they found to affect the results by almost 46% . The results provide deeper understanding for baryon structure thereby motivating experiments for further inspection, especially the spin distribution among the quarks and gluons. |
1108.1206 | Daniel Almeida Fagundes | D. A. Fagundes, E. G. S. Luna, M. J. Menon, A. A. Natale | Testing parameters in an eikonalized dynamical gluon mass model | misprints corrected, one reference updated and minor changes | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the framework of a dynamical gluon mass model recently developed, we
investigate the effects of two essential parameters in the description of
elastic $pp$ and $\bar{p}p$ data at high energies: the soft Pomeron intercept
and the dynamical gluon mass. By considering relevant numerical intervals for
both parameters and fits to the experimental data up to 1.8 TeV, with good
statistical results, we discuss the predictions of the physical quantities at
the LHC energies (7 and 14 TeV). We conclude that these quantities are
sensitive to those variations and the predictions are correlated with the
intervals considered for both parameters. This conclusion puts limits on the
reliability of QCD inspired models predictions at the LHC energies, mainly
those models with ad hoc fixed values for the mass scale and the Pomeron
intercept.
| [
{
"created": "Thu, 4 Aug 2011 20:10:18 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Aug 2011 15:52:00 GMT",
"version": "v2"
},
{
"created": "Tue, 17 Jan 2012 15:15:43 GMT",
"version": "v3"
}
] | 2012-01-18 | [
[
"Fagundes",
"D. A.",
""
],
[
"Luna",
"E. G. S.",
""
],
[
"Menon",
"M. J.",
""
],
[
"Natale",
"A. A.",
""
]
] | In the framework of a dynamical gluon mass model recently developed, we investigate the effects of two essential parameters in the description of elastic $pp$ and $\bar{p}p$ data at high energies: the soft Pomeron intercept and the dynamical gluon mass. By considering relevant numerical intervals for both parameters and fits to the experimental data up to 1.8 TeV, with good statistical results, we discuss the predictions of the physical quantities at the LHC energies (7 and 14 TeV). We conclude that these quantities are sensitive to those variations and the predictions are correlated with the intervals considered for both parameters. This conclusion puts limits on the reliability of QCD inspired models predictions at the LHC energies, mainly those models with ad hoc fixed values for the mass scale and the Pomeron intercept. |
2102.03598 | Sourav Pal | Neelima Agarwal, Lorenzo Magnea, Sourav Pal, Anurag Tripathi | Cwebs beyond three loops in multiparton amplitudes | 51 pages, 37 figures, Published version, published in JHEP | null | 10.1007/JHEP03(2021)188 | null | hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | Correlators of Wilson-line operators in non-abelian gauge theories are known
to exponentiate, and their logarithms can be organised in terms of collections
of Feynman diagrams called webs. In [1] we introduced the concept of Cweb, or
correlator web, which is a set of skeleton diagrams built with connected gluon
correlators, and we computed the mixing matrices for all Cwebs connecting four
or five Wilson lines at four loops. Here we complete the evaluation of
four-loop mixing matrices, presenting the results for all Cwebs connecting two
and three Wilson lines. We observe that the conjuctured column sum rule is
obeyed by all the mixing matrices that appear at four-loops. We also show how
low-dimensional mixing matrices can be uniquely determined from their known
combinatorial properties, and provide some all-order results for selected
classes of mixing matrices. Our results complete the required colour building
blocks for the calculation of the soft anomalous dimension matrix at four-loop
order.
| [
{
"created": "Sat, 6 Feb 2021 15:31:54 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Jun 2021 06:57:35 GMT",
"version": "v2"
}
] | 2021-06-22 | [
[
"Agarwal",
"Neelima",
""
],
[
"Magnea",
"Lorenzo",
""
],
[
"Pal",
"Sourav",
""
],
[
"Tripathi",
"Anurag",
""
]
] | Correlators of Wilson-line operators in non-abelian gauge theories are known to exponentiate, and their logarithms can be organised in terms of collections of Feynman diagrams called webs. In [1] we introduced the concept of Cweb, or correlator web, which is a set of skeleton diagrams built with connected gluon correlators, and we computed the mixing matrices for all Cwebs connecting four or five Wilson lines at four loops. Here we complete the evaluation of four-loop mixing matrices, presenting the results for all Cwebs connecting two and three Wilson lines. We observe that the conjuctured column sum rule is obeyed by all the mixing matrices that appear at four-loops. We also show how low-dimensional mixing matrices can be uniquely determined from their known combinatorial properties, and provide some all-order results for selected classes of mixing matrices. Our results complete the required colour building blocks for the calculation of the soft anomalous dimension matrix at four-loop order. |
hep-ph/0401009 | BingAn Li | Bing An Li | Correction of the low energy theorem of \gamma\to2\pi anomaly | 14 pages | null | null | null | hep-ph | null | A correction of the low energy theorem of the \gamma\to3\pi anomaly has been
found. A_{3\pi}(0,0,0) and the cross section are calculated. Theory agrees with
data. There is no new adjustable parameter.
| [
{
"created": "Fri, 2 Jan 2004 17:19:30 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Li",
"Bing An",
""
]
] | A correction of the low energy theorem of the \gamma\to3\pi anomaly has been found. A_{3\pi}(0,0,0) and the cross section are calculated. Theory agrees with data. There is no new adjustable parameter. |
2309.16755 | Manuel Reichert | Roman Pasechnik, Manuel Reichert, Francesco Sannino, Zhi-Wei Wang | Gravitational Waves from Composite Dark Sectors | 19 pages, 8 figures | null | null | null | hep-ph astro-ph.CO hep-lat hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study under which conditions a first-order phase transition in a composite
dark sector can yield an observable stochastic gravitational-wave signal. To
this end, we employ the Linear-Sigma model featuring $N_f=3,4,5$ flavours and
perform a Cornwall-Jackiw-Tomboulis computation also accounting for the effects
of the Polyakov loop. The model allows us to investigate the chiral phase
transition in regimes that can mimic QCD-like theories incorporating in
addition composite dynamics associated with the effects of
confinement-deconfinement phase transition. A further benefit of this approach
is that it allows to study the limit in which the effective interactions are
weak. We show that strong first-order phase transitions occur for weak
effective couplings of the composite sector leading to gravitational-wave
signals potentially detectable at future experimental facilities.
| [
{
"created": "Thu, 28 Sep 2023 18:00:04 GMT",
"version": "v1"
}
] | 2023-10-02 | [
[
"Pasechnik",
"Roman",
""
],
[
"Reichert",
"Manuel",
""
],
[
"Sannino",
"Francesco",
""
],
[
"Wang",
"Zhi-Wei",
""
]
] | We study under which conditions a first-order phase transition in a composite dark sector can yield an observable stochastic gravitational-wave signal. To this end, we employ the Linear-Sigma model featuring $N_f=3,4,5$ flavours and perform a Cornwall-Jackiw-Tomboulis computation also accounting for the effects of the Polyakov loop. The model allows us to investigate the chiral phase transition in regimes that can mimic QCD-like theories incorporating in addition composite dynamics associated with the effects of confinement-deconfinement phase transition. A further benefit of this approach is that it allows to study the limit in which the effective interactions are weak. We show that strong first-order phase transitions occur for weak effective couplings of the composite sector leading to gravitational-wave signals potentially detectable at future experimental facilities. |
1903.12177 | Xing-Gang Wu | Xing-Gang Wu, Jian-Ming Shen, Bo-Lun Du, Xu-Dong Huang, Sheng-Quan
Wang and Stanley J. Brodsky | The QCD Renormalization Group Equation and the Elimination of
Fixed-Order Scheme-and-Scale Ambiguities Using the Principle of Maximum
Conformality | 67 pages, 26 figures. Updated version which has been published as an
invited review for Prog.Part.Nucl.Phys. arXiv admin note: text overlap with
arXiv:1802.09154 | Prog. Part. Nucl. Phys. 108, 103706 (2019) | 10.1016/j.ppnp.2019.05.003 | SLAC-PUB-17403 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The conventional approach to fixed-order perturbative QCD predictions is
based on an arbitrary choice of the renormalization scale, together with an
arbitrary range. This {\it ad hoc} assignment of the renormalization scale
causes the coefficients of the QCD running coupling at each perturbative order
to be strongly dependent on the choice of both the renormalization scale and
the renormalization scheme. However, such ambiguities are not necessary, since
as a basic requirement of renormalization group invariance (RGI), any physical
observable must be independent of the choice of both the renormalization scheme
and the renormalization scale. In fact, if one uses the {\it Principle of
Maximum Conformality} (PMC) to fix the renormalization scale, the coefficients
of the pQCD series match the series of conformal theory, and they are thus
scheme independent. It has been found that the elimination of the scale and
scheme ambiguities at all orders relies heavily on how precisely we know the
analytic form of the QCD running coupling $\alpha_s$. In this review, we
summarize the known properties of the QCD running coupling and its recent
progresses, especially for its behavior within the asymptotic region. We also
summarize the current progress on the PMC and some of its typical applications,
showing to what degree the conventional renormalization scheme-and-scale
ambiguities can be eliminated after applying the PMC. We also compare the PA
approach for the conventional scale-dependent pQCD series and the PMC
scale-independent conformal series. We observe that by using the conformal
series, the PA approach can provide a more reliable estimate of the magnitude
of the uncalculated terms. And if the conformal series for an observable has
been calculated up to $n_{\rm th}$-order level, then the $[N/M]=[0/n-1]$-type
PA series provides an important estimate for the higher-order terms.
| [
{
"created": "Wed, 27 Mar 2019 12:21:35 GMT",
"version": "v1"
},
{
"created": "Sat, 25 May 2019 09:42:17 GMT",
"version": "v2"
},
{
"created": "Wed, 6 Nov 2019 09:37:17 GMT",
"version": "v3"
}
] | 2019-12-19 | [
[
"Wu",
"Xing-Gang",
""
],
[
"Shen",
"Jian-Ming",
""
],
[
"Du",
"Bo-Lun",
""
],
[
"Huang",
"Xu-Dong",
""
],
[
"Wang",
"Sheng-Quan",
""
],
[
"Brodsky",
"Stanley J.",
""
]
] | The conventional approach to fixed-order perturbative QCD predictions is based on an arbitrary choice of the renormalization scale, together with an arbitrary range. This {\it ad hoc} assignment of the renormalization scale causes the coefficients of the QCD running coupling at each perturbative order to be strongly dependent on the choice of both the renormalization scale and the renormalization scheme. However, such ambiguities are not necessary, since as a basic requirement of renormalization group invariance (RGI), any physical observable must be independent of the choice of both the renormalization scheme and the renormalization scale. In fact, if one uses the {\it Principle of Maximum Conformality} (PMC) to fix the renormalization scale, the coefficients of the pQCD series match the series of conformal theory, and they are thus scheme independent. It has been found that the elimination of the scale and scheme ambiguities at all orders relies heavily on how precisely we know the analytic form of the QCD running coupling $\alpha_s$. In this review, we summarize the known properties of the QCD running coupling and its recent progresses, especially for its behavior within the asymptotic region. We also summarize the current progress on the PMC and some of its typical applications, showing to what degree the conventional renormalization scheme-and-scale ambiguities can be eliminated after applying the PMC. We also compare the PA approach for the conventional scale-dependent pQCD series and the PMC scale-independent conformal series. We observe that by using the conformal series, the PA approach can provide a more reliable estimate of the magnitude of the uncalculated terms. And if the conformal series for an observable has been calculated up to $n_{\rm th}$-order level, then the $[N/M]=[0/n-1]$-type PA series provides an important estimate for the higher-order terms. |
hep-ph/0410092 | Roberto Bonciani | R. Bonciani | Two-loop QCD corrections to the vector form factors for the heavy-quark
photo-production | Talk presented at the 11th International QCD Conference: QCD04,
Montpellier, France, 5-10 July 2004; 4 pages, 4 figures | null | 10.1016/j.nuclphysbps.2005.08.032 | null | hep-ph | null | We review on the calculation of the heavy-quark photo-production vector form
factors, with the full dependence on the mass of the heavy-quark. The Feynman
diagrams are evaluated within the dimensional regularization scheme and
expressed in Laurent series of $\epsilon=(4-D)/2$, where $D$ is the space-time
dimension. The coefficients of the expansion are expressed in terms of harmonic
polylogarithms. The numerical evaluation of the analytical formulas and the
threshold limit of our results are presented.
| [
{
"created": "Wed, 6 Oct 2004 14:55:44 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Bonciani",
"R.",
""
]
] | We review on the calculation of the heavy-quark photo-production vector form factors, with the full dependence on the mass of the heavy-quark. The Feynman diagrams are evaluated within the dimensional regularization scheme and expressed in Laurent series of $\epsilon=(4-D)/2$, where $D$ is the space-time dimension. The coefficients of the expansion are expressed in terms of harmonic polylogarithms. The numerical evaluation of the analytical formulas and the threshold limit of our results are presented. |
hep-ph/0110057 | Nikolai Achasov | N.N. Achasov (Sobolev Institute for Mathematics SB RAS, Novosibirsk) | Relative phase between the three-gluon and one-photon amplitudes of the
J/psi decays | Parallel session talk at HADRON 2001, Protvino, Russia, August 30, 4
pages, revtex, tightlines | AIP Conf.Proc. 619 (2002) 649-652 | 10.1063/1.1482510 | null | hep-ph hep-ex nucl-th | null | It is shown that the study of the \omega-\rho interference pattern in the
J/psi -> (rho+omega)eta -> pi+pi-eta decay provides evidence for the large
(nearly 90 degrees) relative phase between the isovector one-photon and
three-gluon decay amplitudes.
| [
{
"created": "Thu, 4 Oct 2001 09:51:33 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Achasov",
"N. N.",
"",
"Sobolev Institute for Mathematics SB RAS, Novosibirsk"
]
] | It is shown that the study of the \omega-\rho interference pattern in the J/psi -> (rho+omega)eta -> pi+pi-eta decay provides evidence for the large (nearly 90 degrees) relative phase between the isovector one-photon and three-gluon decay amplitudes. |
2110.02234 | Cristian Gaidau | Cristian Gaidau and Jessie Shelton | Singularities in the Gravitational Capture of Dark Matter through
Long-Range Interactions | v2: version accepted for publication in JCAP; 30 pages, 5 figures | null | 10.1088/1475-7516/2022/01/016 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We re-examine the gravitational capture of dark matter (DM) through
long-range interactions. We demonstrate that neglecting the thermal motion of
target particles, which is often a good approximation for short-range capture,
results in parametrically inaccurate results for long-range capture. When the
particle mediating the scattering process has a mass that is small in
comparison to the momentum transfer in scattering events, correctly
incorporating the thermal motion of target particles results in a quadratic,
rather than logarithmic, sensitivity to the mediator mass, which substantially
enhances the capture rate. We quantitatively assess the impact of this finite
temperature effect on the captured DM population in the Sun as a function of
mediator mass. We find that capture of DM through light dark photons, as in
e.g. mirror DM, can be powerfully enhanced, with self-capture attaining a
geometric limit over much of parameter space. For visibly-decaying dark
photons, thermal corrections are not large in the Sun, but may be important in
understanding long-range DM capture in more massive bodies such as Population
III stars. We additionally provide the first calculation of the long-range DM
self-evaporation rate.
| [
{
"created": "Tue, 5 Oct 2021 18:00:03 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Dec 2021 04:15:37 GMT",
"version": "v2"
}
] | 2022-01-19 | [
[
"Gaidau",
"Cristian",
""
],
[
"Shelton",
"Jessie",
""
]
] | We re-examine the gravitational capture of dark matter (DM) through long-range interactions. We demonstrate that neglecting the thermal motion of target particles, which is often a good approximation for short-range capture, results in parametrically inaccurate results for long-range capture. When the particle mediating the scattering process has a mass that is small in comparison to the momentum transfer in scattering events, correctly incorporating the thermal motion of target particles results in a quadratic, rather than logarithmic, sensitivity to the mediator mass, which substantially enhances the capture rate. We quantitatively assess the impact of this finite temperature effect on the captured DM population in the Sun as a function of mediator mass. We find that capture of DM through light dark photons, as in e.g. mirror DM, can be powerfully enhanced, with self-capture attaining a geometric limit over much of parameter space. For visibly-decaying dark photons, thermal corrections are not large in the Sun, but may be important in understanding long-range DM capture in more massive bodies such as Population III stars. We additionally provide the first calculation of the long-range DM self-evaporation rate. |
2401.13896 | Sarira Sahu | Jos\'e F. Nieves and Sarira Sahu | Photon propagation in a charged Bose-Einstein condensate | 19 pages, 7 figures | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We consider the propagation of photons in a model of a charged scalar
Bose-Einstein (BE) condensate. We determine the dispersion relations of the
collective modes, as well as the photon polarization tensor and the dielectric
constant in the model. Two modes correspond to the transverse photon
polarizations, with dispersion relations of the usual form for transverse
photons in a plasma. The other two modes, denoted as the $(\pm)$ modes, are
combinations of the longitudinal photon and the massive scalar field. Their
dispersion relations behave very differently as functions of momentum. The
$(+)$ mode dispersion relation increases steadily and remains greater than the
momentum as the momentum increases. The dispersion relation of the $(-)$ mode
decreases in a given momentum range, with the group velocity being negative in
that range, while in another range it increases steadily but remains smaller
than the momentum, akin to the situation in a medium with an index of
refraction greater than 1. We consider the non-relativistic limit of the
$(\pm)$ dispersion relations and discuss some aspects of the results. We also
determine the wavefunctions of the $(\pm)$ modes, which are useful to obtain
the corrections to the dispersion relations, e.g., imaginary parts due to the
damping effects and/or the effects of scattering, due to the interactions with
the excitations of the system. The results can be useful in various physical
contexts that have been considered in the literature involving the
electrodynamics of a charged scalar BE condensate.
| [
{
"created": "Thu, 25 Jan 2024 02:23:50 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Jul 2024 18:52:27 GMT",
"version": "v2"
}
] | 2024-08-01 | [
[
"Nieves",
"José F.",
""
],
[
"Sahu",
"Sarira",
""
]
] | We consider the propagation of photons in a model of a charged scalar Bose-Einstein (BE) condensate. We determine the dispersion relations of the collective modes, as well as the photon polarization tensor and the dielectric constant in the model. Two modes correspond to the transverse photon polarizations, with dispersion relations of the usual form for transverse photons in a plasma. The other two modes, denoted as the $(\pm)$ modes, are combinations of the longitudinal photon and the massive scalar field. Their dispersion relations behave very differently as functions of momentum. The $(+)$ mode dispersion relation increases steadily and remains greater than the momentum as the momentum increases. The dispersion relation of the $(-)$ mode decreases in a given momentum range, with the group velocity being negative in that range, while in another range it increases steadily but remains smaller than the momentum, akin to the situation in a medium with an index of refraction greater than 1. We consider the non-relativistic limit of the $(\pm)$ dispersion relations and discuss some aspects of the results. We also determine the wavefunctions of the $(\pm)$ modes, which are useful to obtain the corrections to the dispersion relations, e.g., imaginary parts due to the damping effects and/or the effects of scattering, due to the interactions with the excitations of the system. The results can be useful in various physical contexts that have been considered in the literature involving the electrodynamics of a charged scalar BE condensate. |
2110.07517 | Chun-Wei Su | Chuan-Hung Chen, Cheng-Wei Chiang, Chun-Wei Su | Ultra-high-energy neutrino scattering in an anomalous U(1) effective
field theory | 18 pages, 6 figures, version published in Physics Letters B | null | 10.1016/j.physletb.2022.136988 | null | hep-ph astro-ph.HE hep-ex | http://creativecommons.org/licenses/by-sa/4.0/ | A unique characteristic of exponentially growing scattering amplitude arises
in an anomalous Abelian effective field theory when an extremely light Dirac
neutrino mass is introduced to break the symmetry. We show that the low energy
effective Lagrangian can be made explicitly gauge invariant with the help of a
nonlinear representation of the Goldstone or Stueckelberg field. We study the
peculiar feature of exponential growth in the ultra-high-energy
neutrino-nucleon inelastic scattering. It is found that the inelastic
scattering cross section is highly sensitive to the ratio of gauge coupling to
the gauge boson mass, $g_X/m_X$. When the IceCube measurement of
ultra-high-energy neutrinos, which is consistent with the standard model
prediction up to $E_\nu \sim 6$ PeV, is taken into account, the inferred
constraint on $g_X/m_X$ is more severe than that obtained from the events of
mono-lepton$+$missing transverse energy at the LHC. A muon collider with a
collision energy of $10$ TeV can be a good environment other than hadron
colliders to probe the novel effect.
| [
{
"created": "Thu, 14 Oct 2021 16:40:32 GMT",
"version": "v1"
},
{
"created": "Fri, 22 Oct 2021 16:00:57 GMT",
"version": "v2"
},
{
"created": "Mon, 21 Feb 2022 17:09:45 GMT",
"version": "v3"
},
{
"created": "Wed, 5 Oct 2022 15:39:39 GMT",
"version": "v4"
}
] | 2022-10-06 | [
[
"Chen",
"Chuan-Hung",
""
],
[
"Chiang",
"Cheng-Wei",
""
],
[
"Su",
"Chun-Wei",
""
]
] | A unique characteristic of exponentially growing scattering amplitude arises in an anomalous Abelian effective field theory when an extremely light Dirac neutrino mass is introduced to break the symmetry. We show that the low energy effective Lagrangian can be made explicitly gauge invariant with the help of a nonlinear representation of the Goldstone or Stueckelberg field. We study the peculiar feature of exponential growth in the ultra-high-energy neutrino-nucleon inelastic scattering. It is found that the inelastic scattering cross section is highly sensitive to the ratio of gauge coupling to the gauge boson mass, $g_X/m_X$. When the IceCube measurement of ultra-high-energy neutrinos, which is consistent with the standard model prediction up to $E_\nu \sim 6$ PeV, is taken into account, the inferred constraint on $g_X/m_X$ is more severe than that obtained from the events of mono-lepton$+$missing transverse energy at the LHC. A muon collider with a collision energy of $10$ TeV can be a good environment other than hadron colliders to probe the novel effect. |
1805.09182 | Herschel A. Chawdhry | Herschel A. Chawdhry, Matthew A. Lim and Alexander Mitov | Two-loop five-point massless QCD amplitudes within the IBP approach | 6 pages, 1 ancillary file, results available from
"http://www.precision.hep.phy.cam.ac.uk/results/amplitudes/". v2 (published
version): added references | Phys. Rev. D 99, 076011 (2019) | 10.1103/PhysRevD.99.076011 | Cavendish-HEP-18/11 | hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | We solve the integration-by-parts (IBP) identities needed for the computation
of any planar two-loop five-point massless amplitude in QCD. We also derive
some new results for the most complicated non-planar topology with irreducible
numerators of power as high as six. We do this by applying a new strategy for
solving the IBP identities which scales better for problems with a large number
of scales and/or master integrals. Our results are a proof of principle that
the remaining non-planar contributions for all two-loop five-point massless QCD
amplitudes can be computed in analytic form.
| [
{
"created": "Wed, 23 May 2018 14:01:45 GMT",
"version": "v1"
},
{
"created": "Sun, 11 Aug 2019 17:24:02 GMT",
"version": "v2"
}
] | 2019-08-13 | [
[
"Chawdhry",
"Herschel A.",
""
],
[
"Lim",
"Matthew A.",
""
],
[
"Mitov",
"Alexander",
""
]
] | We solve the integration-by-parts (IBP) identities needed for the computation of any planar two-loop five-point massless amplitude in QCD. We also derive some new results for the most complicated non-planar topology with irreducible numerators of power as high as six. We do this by applying a new strategy for solving the IBP identities which scales better for problems with a large number of scales and/or master integrals. Our results are a proof of principle that the remaining non-planar contributions for all two-loop five-point massless QCD amplitudes can be computed in analytic form. |
2001.09487 | Helen Matskevich | S.M. Gerasyuta and E.E. Matskevich | Baryonia with open and hidden strange | 9 pages. arXiv admin note: substantial text overlap with
arXiv:1009.3365, arXiv:1105.0824, arXiv:1105.0817, arXiv:1109.2338,
arXiv:1211.0667, arXiv:1212.0444 | null | 10.1142/S0218301320500354 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The relativistic six-quark equations are found in the framework of the
dispersion relation technique. The strange baryonia are constructed without the
mixing of the quarks and antiquarks. The relativistic six-quark amplitudes of
the strange baryonia with the open and hidden strange are calculated. The poles
of these amplitudes determine the masses of strange baryonia. 17 masses of
baryonia are predicted.
| [
{
"created": "Sun, 26 Jan 2020 17:14:42 GMT",
"version": "v1"
}
] | 2020-08-26 | [
[
"Gerasyuta",
"S. M.",
""
],
[
"Matskevich",
"E. E.",
""
]
] | The relativistic six-quark equations are found in the framework of the dispersion relation technique. The strange baryonia are constructed without the mixing of the quarks and antiquarks. The relativistic six-quark amplitudes of the strange baryonia with the open and hidden strange are calculated. The poles of these amplitudes determine the masses of strange baryonia. 17 masses of baryonia are predicted. |
hep-ph/0307119 | M. N. Rebelo | G. C. Branco, P. A. Parada and M. N. Rebelo | A Common Origin for all CP Violations | 4 pages, no figures, uses revtex4 | null | null | CERN-TH/2003-153 | hep-ph | null | We put forward the conjecture that all CP violating phenomena may have a
common origin. In order to illustrate our idea, we present a minimal model
where CP is spontaneously broken at a high energy scale, through the phase in
the vacuum expectation value of a complex scalar singlet. This single phase is
the origin of both low energy CP violation in the quark and leptonic sectors,
as well as leptogenesis. We also show that in this framework the strong CP
problem may be solved in a simple way through the introduction of a Z_4
symmetry which allows for the implementation of the Nelson-Barr mechanism.
| [
{
"created": "Tue, 8 Jul 2003 18:59:57 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Branco",
"G. C.",
""
],
[
"Parada",
"P. A.",
""
],
[
"Rebelo",
"M. N.",
""
]
] | We put forward the conjecture that all CP violating phenomena may have a common origin. In order to illustrate our idea, we present a minimal model where CP is spontaneously broken at a high energy scale, through the phase in the vacuum expectation value of a complex scalar singlet. This single phase is the origin of both low energy CP violation in the quark and leptonic sectors, as well as leptogenesis. We also show that in this framework the strong CP problem may be solved in a simple way through the introduction of a Z_4 symmetry which allows for the implementation of the Nelson-Barr mechanism. |
1902.05614 | Istv\'an Szanyi | L\'aszl\'o Jenkovszky, Rainer Schicker, Istv\'an Szanyi | Elastic and diffractive scattering in the LHC era | 45 pages, 38 figures, 2 tables | International Journal of Modern Physics E Vol. 27, No. 08, 1830005
(2018) | 10.1142/S0218301318300059 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review elastic and diffractive scattering of protons (called also "forward
physics") with emphasis on the LHC data, especially those deviating from the
expectations based on extrapolations from earlier measurements at the ISR,
Fermilab and thus triggering searches for new ideas, models and theories. We
list these new data and provide a brief introduction of available theoretical
approaches, mainly those based on analyticity, crossing symmetry and unitarity,
particularly the Regge-pole model realizing these concepts. Fits to the data
are presented and tensions between theoretical predictions and the data that
may indicate the way to further progress are in the focus of our paper.
| [
{
"created": "Thu, 14 Feb 2019 21:47:27 GMT",
"version": "v1"
}
] | 2019-02-18 | [
[
"Jenkovszky",
"László",
""
],
[
"Schicker",
"Rainer",
""
],
[
"Szanyi",
"István",
""
]
] | We review elastic and diffractive scattering of protons (called also "forward physics") with emphasis on the LHC data, especially those deviating from the expectations based on extrapolations from earlier measurements at the ISR, Fermilab and thus triggering searches for new ideas, models and theories. We list these new data and provide a brief introduction of available theoretical approaches, mainly those based on analyticity, crossing symmetry and unitarity, particularly the Regge-pole model realizing these concepts. Fits to the data are presented and tensions between theoretical predictions and the data that may indicate the way to further progress are in the focus of our paper. |
1905.10537 | Yi-Peng Wu | Yi-Peng Wu, Louis Yang, Alexander Kusenko | Leptogenesis from spontaneous symmetry breaking during inflation | 21 + 2 pages, 13 + 1 figures; added discussion on non-perturbative
Higgs decay; references updated; version matched with publication | null | 10.1007/JHEP12(2019)088 | RESCEU 6/19, IPMU19-0079 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Symmetry breaking in the Higgs field via a non-minimal coupling to gravity or
higher-dimensional interactions with the inflaton can lead to condensation at a
large vacuum expectation value (VEV) during inflation. After inflation is over,
the Higgs field must relax to the minimum of its effective potential, creating
an era in which the CPT is effectively broken by the time-depended VEV. We show
that the matter-antimatter asymmetry can be generated during this relaxation
epoch.
| [
{
"created": "Sat, 25 May 2019 07:05:06 GMT",
"version": "v1"
},
{
"created": "Fri, 26 Jul 2019 07:09:13 GMT",
"version": "v2"
},
{
"created": "Fri, 17 Jan 2020 16:59:53 GMT",
"version": "v3"
}
] | 2020-01-20 | [
[
"Wu",
"Yi-Peng",
""
],
[
"Yang",
"Louis",
""
],
[
"Kusenko",
"Alexander",
""
]
] | Symmetry breaking in the Higgs field via a non-minimal coupling to gravity or higher-dimensional interactions with the inflaton can lead to condensation at a large vacuum expectation value (VEV) during inflation. After inflation is over, the Higgs field must relax to the minimum of its effective potential, creating an era in which the CPT is effectively broken by the time-depended VEV. We show that the matter-antimatter asymmetry can be generated during this relaxation epoch. |
0808.3977 | Brian Batell | Brian Batell, Tony Gherghetta, Daniel Sword | The Soft-Wall Standard Model | 32 pages, 3 figures | Phys.Rev.D78:116011,2008 | 10.1103/PhysRevD.78.116011 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore the possibility of modeling electroweak physics in a warped extra
dimension with a soft wall. The infrared boundary is replaced with a smoothly
varying dilaton field that provides a dynamical spacetime cutoff. We analyze
gravity, gauge fields, and fermions in the soft-wall background and obtain a
discrete spectrum of Kaluza-Klein states which can exhibit linear Regge-like
behavior. Bulk Yukawa interactions give rise to nonconstant fermion mass terms,
leading to fermion localization in the soft-wall background and a possible
explanation of the Standard Model flavor structure. Furthermore we construct
electroweak models with custodial symmetry, where the gauge symmetry is broken
with a bulk Higgs condensate. The electroweak constraints are not as stringent
as in hard-wall models, allowing Kaluza-Klein masses of order the TeV scale.
| [
{
"created": "Thu, 28 Aug 2008 19:38:26 GMT",
"version": "v1"
}
] | 2008-12-30 | [
[
"Batell",
"Brian",
""
],
[
"Gherghetta",
"Tony",
""
],
[
"Sword",
"Daniel",
""
]
] | We explore the possibility of modeling electroweak physics in a warped extra dimension with a soft wall. The infrared boundary is replaced with a smoothly varying dilaton field that provides a dynamical spacetime cutoff. We analyze gravity, gauge fields, and fermions in the soft-wall background and obtain a discrete spectrum of Kaluza-Klein states which can exhibit linear Regge-like behavior. Bulk Yukawa interactions give rise to nonconstant fermion mass terms, leading to fermion localization in the soft-wall background and a possible explanation of the Standard Model flavor structure. Furthermore we construct electroweak models with custodial symmetry, where the gauge symmetry is broken with a bulk Higgs condensate. The electroweak constraints are not as stringent as in hard-wall models, allowing Kaluza-Klein masses of order the TeV scale. |
hep-ph/0612334 | Hirotaka Sugawara | Hirotaka Sugawara | Space-Time Duality and Vacuum Energy | 23 pages total with 2 figures | null | null | null | hep-ph astro-ph hep-th | null | The concept of Euclidean time is proposed which is dual to the usual
Minkowski time. The De Sitter solution is shown to be dual to the anti-De
Sitter solution under the dual transformation in which Euclidean time and
Minkowski time are interchanged. This observation enables us to make a proposal
in which supersymmetry is broken, but the four dimensional cosmological
constant remains zero. An explicit model is proposed in which we calculate the
cosmological constant. The phenomenology based on this model is presented,
including the issue of the quark-lepton-Higgs mass matrix.
| [
{
"created": "Wed, 27 Dec 2006 03:54:55 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Sugawara",
"Hirotaka",
""
]
] | The concept of Euclidean time is proposed which is dual to the usual Minkowski time. The De Sitter solution is shown to be dual to the anti-De Sitter solution under the dual transformation in which Euclidean time and Minkowski time are interchanged. This observation enables us to make a proposal in which supersymmetry is broken, but the four dimensional cosmological constant remains zero. An explicit model is proposed in which we calculate the cosmological constant. The phenomenology based on this model is presented, including the issue of the quark-lepton-Higgs mass matrix. |
1112.2659 | Isabella Masina | Isabella Masina, Alessio Notari | The Higgs mass range from Standard Model false vacuum Inflation in
scalar-tensor gravity | v1: 14 pages, 4 figures; v2: 18 pages, 8 figures, text improved, new
section and figures added | null | 10.1103/PhysRevD.85.123506 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | If the Standard Model is valid up to very high energies it is known that the
Higgs potential can develop a local minimum at field values around
$10^{15}-10^{17}$ GeV, for a narrow band of values of the top quark and Higgs
masses. We show that in a scalar-tensor theory of gravity such Higgs false
vacuum can give rise to viable inflation if the potential barrier is very
shallow, allowing for tunneling and relaxation into the electroweak scale true
vacuum. The amplitude of cosmological density perturbations from inflation is
directly linked to the value of the Higgs potential at the false minimum.
Requiring the top quark mass, the amplitude and spectral index of density
perturbations to be compatible with observations, selects a narrow range of
values for the Higgs mass, $m_H=126.0\pm 3.5$ GeV, where the error is mostly
due to the theoretical uncertainty of the 2-loop RGE. This prediction could be
soon tested at the Large Hadron Collider. Our inflationary scenario could also
be further checked by better constraining the spectral index and the
tensor-to-scalar ratio.
| [
{
"created": "Mon, 12 Dec 2011 19:19:19 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Mar 2012 18:41:21 GMT",
"version": "v2"
}
] | 2013-05-30 | [
[
"Masina",
"Isabella",
""
],
[
"Notari",
"Alessio",
""
]
] | If the Standard Model is valid up to very high energies it is known that the Higgs potential can develop a local minimum at field values around $10^{15}-10^{17}$ GeV, for a narrow band of values of the top quark and Higgs masses. We show that in a scalar-tensor theory of gravity such Higgs false vacuum can give rise to viable inflation if the potential barrier is very shallow, allowing for tunneling and relaxation into the electroweak scale true vacuum. The amplitude of cosmological density perturbations from inflation is directly linked to the value of the Higgs potential at the false minimum. Requiring the top quark mass, the amplitude and spectral index of density perturbations to be compatible with observations, selects a narrow range of values for the Higgs mass, $m_H=126.0\pm 3.5$ GeV, where the error is mostly due to the theoretical uncertainty of the 2-loop RGE. This prediction could be soon tested at the Large Hadron Collider. Our inflationary scenario could also be further checked by better constraining the spectral index and the tensor-to-scalar ratio. |
2303.13979 | Piotr Lebiedowicz | Piotr Lebiedowicz, Otto Nachtmann, Antoni Szczurek | Exclusive diffractive bremsstrahlung of one and two photons at forward
rapidities: Possibilities for experimental studies in $pp$ collisions at the
LHC | 18 pages, 9 figures. In v2 we discussed the role of the $p p \to p p
\pi^0$ background for single photon production | Phys.Lett.B 843 (2023) 138053 | 10.1016/j.physletb.2023.138053 | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | We evaluate the cross section for diffractive bremsstrahlung of a single
photon in the $pp \to pp \gamma$ reaction at high energies and at forward
photon rapidities. Several differential distributions, for instance, in $y$,
$k_{\perp}$ and $\omega$, the rapidity, the absolute value of the transverse
momentum, and the energy of the photon, respectively, are presented. We compare
the results for our standard approach, based on QFT and the tensor-pomeron
model, with two versions of soft-photon-approximations, SPA1 and SPA2, where
the radiative amplitudes contain only the leading terms proportional to
$\omega^{-1}$. The SPA1, which does not have the correct energy-momentum
relations, performs surprisingly well in the kinematic range considered. We
discuss also azimuthal correlations between outgoing particles. The azimuthal
distributions are not isotropic and are different for our standard model and
SPAs. We discuss also the possibility of a measurement of
two-photon-bremsstrahlung in the $pp \to pp \gamma \gamma$ reaction. In our
calculations we impose a cut on the relative energy loss ($0.02 < \xi_{i} <
0.1$, $i = 1,2$) of the protons where measurements by the ATLAS Forward Proton
(AFP) detectors are possible. The AFP requirement for both diffractively
scattered protons and one forward photon (measured at LHCf) reduces the cross
section for $p p \to p p \gamma$ almost to zero. On the other hand, much less
cross-section reduction occurs for $pp \to pp \gamma \gamma$ when photons are
emitted in opposite sides of the ATLAS interaction point and can be measured by
two different arms of LHCf. For the SPA1 ansatz we find $\sigma(pp \to pp
\gamma \gamma) \simeq 0.03$ nb at $\sqrt{s} = 13$ TeV and with the cuts $0.02 <
\xi_{i} < 0.1$, $8.5 < y_{3} < 9$, $-9 < y_{4} < -8.5$. Our predictions can be
verified by ATLAS and LHCf combined experiments.
| [
{
"created": "Fri, 24 Mar 2023 13:05:53 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Jul 2023 05:56:57 GMT",
"version": "v2"
}
] | 2023-07-11 | [
[
"Lebiedowicz",
"Piotr",
""
],
[
"Nachtmann",
"Otto",
""
],
[
"Szczurek",
"Antoni",
""
]
] | We evaluate the cross section for diffractive bremsstrahlung of a single photon in the $pp \to pp \gamma$ reaction at high energies and at forward photon rapidities. Several differential distributions, for instance, in $y$, $k_{\perp}$ and $\omega$, the rapidity, the absolute value of the transverse momentum, and the energy of the photon, respectively, are presented. We compare the results for our standard approach, based on QFT and the tensor-pomeron model, with two versions of soft-photon-approximations, SPA1 and SPA2, where the radiative amplitudes contain only the leading terms proportional to $\omega^{-1}$. The SPA1, which does not have the correct energy-momentum relations, performs surprisingly well in the kinematic range considered. We discuss also azimuthal correlations between outgoing particles. The azimuthal distributions are not isotropic and are different for our standard model and SPAs. We discuss also the possibility of a measurement of two-photon-bremsstrahlung in the $pp \to pp \gamma \gamma$ reaction. In our calculations we impose a cut on the relative energy loss ($0.02 < \xi_{i} < 0.1$, $i = 1,2$) of the protons where measurements by the ATLAS Forward Proton (AFP) detectors are possible. The AFP requirement for both diffractively scattered protons and one forward photon (measured at LHCf) reduces the cross section for $p p \to p p \gamma$ almost to zero. On the other hand, much less cross-section reduction occurs for $pp \to pp \gamma \gamma$ when photons are emitted in opposite sides of the ATLAS interaction point and can be measured by two different arms of LHCf. For the SPA1 ansatz we find $\sigma(pp \to pp \gamma \gamma) \simeq 0.03$ nb at $\sqrt{s} = 13$ TeV and with the cuts $0.02 < \xi_{i} < 0.1$, $8.5 < y_{3} < 9$, $-9 < y_{4} < -8.5$. Our predictions can be verified by ATLAS and LHCf combined experiments. |
1805.03475 | Abdulkadir Senol | A. Senol, H. Denizli, A. Yilmaz, I. Turk Cakir, K.Y. Oyulmaz, O.
Karadeniz and O. Cakir | Probing the Effects of Dimension-eight Operators Describing Anomalous
Neutral Triple Gauge Boson Interactions at FCC-hh | 16 pages, 9 figures, 8 Tables, accepted for publication in Nuclear
Physics B | Nucl. Phys. B935 (2018) 365-376 | 10.1016/j.nuclphysb.2018.08.018 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The effects of dimension-eight operators giving rise to anomalous neutral
triple gauge boson interactions of $Z\gamma\gamma$ and $Z\gamma Z$ vertices in
$pp\to l^-l^+\gamma$ and $pp\to \nu\bar \nu \gamma$ are investigated at 100 TeV
centre of mass energy of future circular hadron collider (FCC-hh). The
transverse momentum of photon, invariant mass of $l^-l^+\gamma$ and angular
distribution of charged lepton in the rest frame of $l^-l^+$ and Missing Energy
Transverse (MET) are considered in the analysis. The realistic detector effects
are also included with Delphes simulation. Sensitivity limits obtained at 95\%
C.L. for $C_{\widetilde B W}/\Lambda^4$ and $C_{B B}/\Lambda^4$ couplings are
$[-0.52;0.52] ([-0.40;0.40])$ TeV$^{-4}$, $[-0.43;0.43] ([-0.33;0.33])$
TeV$^{-4}$ in the dilepton+photon channel and $[-0.11;0.11] ([-0.084;0.084])$
TeV$^{-4}$, $[-0.092;0.092] ([-0.072;0.072])$ TeV$^{-4}$ in the MET+photon
channel with $L_{int}$=1 (3) ab$^{-1}$, respectively.
| [
{
"created": "Wed, 9 May 2018 12:27:39 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Sep 2018 14:15:53 GMT",
"version": "v2"
}
] | 2018-09-12 | [
[
"Senol",
"A.",
""
],
[
"Denizli",
"H.",
""
],
[
"Yilmaz",
"A.",
""
],
[
"Cakir",
"I. Turk",
""
],
[
"Oyulmaz",
"K. Y.",
""
],
[
"Karadeniz",
"O.",
""
],
[
"Cakir",
"O.",
""
]
] | The effects of dimension-eight operators giving rise to anomalous neutral triple gauge boson interactions of $Z\gamma\gamma$ and $Z\gamma Z$ vertices in $pp\to l^-l^+\gamma$ and $pp\to \nu\bar \nu \gamma$ are investigated at 100 TeV centre of mass energy of future circular hadron collider (FCC-hh). The transverse momentum of photon, invariant mass of $l^-l^+\gamma$ and angular distribution of charged lepton in the rest frame of $l^-l^+$ and Missing Energy Transverse (MET) are considered in the analysis. The realistic detector effects are also included with Delphes simulation. Sensitivity limits obtained at 95\% C.L. for $C_{\widetilde B W}/\Lambda^4$ and $C_{B B}/\Lambda^4$ couplings are $[-0.52;0.52] ([-0.40;0.40])$ TeV$^{-4}$, $[-0.43;0.43] ([-0.33;0.33])$ TeV$^{-4}$ in the dilepton+photon channel and $[-0.11;0.11] ([-0.084;0.084])$ TeV$^{-4}$, $[-0.092;0.092] ([-0.072;0.072])$ TeV$^{-4}$ in the MET+photon channel with $L_{int}$=1 (3) ab$^{-1}$, respectively. |
1901.05213 | Maximilian Delto | Maximilian Delto, Kirill Melnikov | Integrated triple-collinear counter-terms for the nested soft-collinear
subtraction scheme | published version | null | 10.1007/JHEP05(2019)148 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We obtain analytic results for integrated triple-collinear splitting
functions that emerge as collinear counter-terms in the context of the nested
soft-collinear subtraction scheme arXiv:1702.01352 . With these results, all
integrated subtraction terms required for NNLO QCD computations within this
scheme are known analytically. In addition to improving efficiency and
numerical stability of practical computations, the availability of these
results will contribute towards establishing a general NNLO QCD subtraction
formula for generic hard scattering processes in hadron collisions, similar to
Catani-Seymour and FKS subtractions at NLO.
| [
{
"created": "Wed, 16 Jan 2019 10:26:06 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Jan 2019 18:17:10 GMT",
"version": "v2"
},
{
"created": "Fri, 16 Aug 2019 09:25:24 GMT",
"version": "v3"
}
] | 2019-08-19 | [
[
"Delto",
"Maximilian",
""
],
[
"Melnikov",
"Kirill",
""
]
] | We obtain analytic results for integrated triple-collinear splitting functions that emerge as collinear counter-terms in the context of the nested soft-collinear subtraction scheme arXiv:1702.01352 . With these results, all integrated subtraction terms required for NNLO QCD computations within this scheme are known analytically. In addition to improving efficiency and numerical stability of practical computations, the availability of these results will contribute towards establishing a general NNLO QCD subtraction formula for generic hard scattering processes in hadron collisions, similar to Catani-Seymour and FKS subtractions at NLO. |
1206.6537 | Kyle Huggins | Kyle Huggins, Ralf Rapp | A T-Matrix Calculation for in-Medium Heavy-Quark Gluon Scattering | null | null | 10.1016/j.nuclphysa.2012.09.008 | null | hep-ph nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The interactions of charm and bottom quarks in a Quark-Gluon Plasma (QGP) are
evaluated using a thermodynamic 2-body T-matrix. We specifically focus on
heavy-quark (HQ) interactions with thermal gluons with an input potential
motivated by lattice-QCD computations of the HQ free energy. The latter is
implemented into a field-theoretic ansatz for color-Coulomb and (remnants of)
confining interactions. This, in particular, enables to discuss corrections to
the potential approach, specifically hard-thermal-loop corrections to the
vertices, relativistic corrections deduced from pertinent Feynman diagrams, and
a suitable projection on transverse thermal gluons. The resulting potentials
are applied to compute scattering amplitudes in different color channels and
utilized for a calculation of the corresponding HQ drag coefficient in the QGP.
A factor of ~2-3 enhancement over perturbative results is obtained, mainly
driven by the resummation in the attractive color-channels.
| [
{
"created": "Wed, 27 Jun 2012 23:03:53 GMT",
"version": "v1"
}
] | 2015-06-05 | [
[
"Huggins",
"Kyle",
""
],
[
"Rapp",
"Ralf",
""
]
] | The interactions of charm and bottom quarks in a Quark-Gluon Plasma (QGP) are evaluated using a thermodynamic 2-body T-matrix. We specifically focus on heavy-quark (HQ) interactions with thermal gluons with an input potential motivated by lattice-QCD computations of the HQ free energy. The latter is implemented into a field-theoretic ansatz for color-Coulomb and (remnants of) confining interactions. This, in particular, enables to discuss corrections to the potential approach, specifically hard-thermal-loop corrections to the vertices, relativistic corrections deduced from pertinent Feynman diagrams, and a suitable projection on transverse thermal gluons. The resulting potentials are applied to compute scattering amplitudes in different color channels and utilized for a calculation of the corresponding HQ drag coefficient in the QGP. A factor of ~2-3 enhancement over perturbative results is obtained, mainly driven by the resummation in the attractive color-channels. |
1102.4562 | Sacha Davidson | Sacha Davidson, Patrice Verdier | Leptoquarks decaying to a top quark and a charged lepton at hadron
colliders | 13 pages, 6 figures, minor changes (typos) | Phys.Rev.D83:115016,2011 | 10.1103/PhysRevD.83.115016 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the sensitivity of the Tevatron and the 7 TeV LHC to a leptoquark S
coupling to a top quark and a charged lepton L (= e, mu, or tau). For the
Tevatron, we focus on the case m_S < m_t, where the leptoquark pair production
cross section is large, and the decay is three-body: S --> W b L^{\pm}. We
argue that existing Tevatron observations could exclude m_S \lsim 160 GeV. For
m_S > m_t, we show that the LHC experiments with low integrated luminosity
could be sensitive to such leptoquarks decaying to tl^{\pm} with l= mu or tau.
| [
{
"created": "Tue, 22 Feb 2011 17:22:46 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Mar 2011 14:05:53 GMT",
"version": "v2"
}
] | 2011-07-04 | [
[
"Davidson",
"Sacha",
""
],
[
"Verdier",
"Patrice",
""
]
] | We study the sensitivity of the Tevatron and the 7 TeV LHC to a leptoquark S coupling to a top quark and a charged lepton L (= e, mu, or tau). For the Tevatron, we focus on the case m_S < m_t, where the leptoquark pair production cross section is large, and the decay is three-body: S --> W b L^{\pm}. We argue that existing Tevatron observations could exclude m_S \lsim 160 GeV. For m_S > m_t, we show that the LHC experiments with low integrated luminosity could be sensitive to such leptoquarks decaying to tl^{\pm} with l= mu or tau. |
2005.12493 | Robert Shrock | Shmuel Nussinov and Robert Shrock | Using $\bar p p$ and $e^+e^-$ Annihilation Data to Refine Bounds on the
Baryon-Number-Violating Dinucleon Decays $nn \to e^+e^-$ and $nn \to
\mu^+\mu^-$ | 5 pages, latex | Phys. Rev. D 102, 035003 (2020) | 10.1103/PhysRevD.102.035003 | Tel Aviv - Stony Brook preprint YITP-SB-2020-10 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use $\bar p p$ and $e^+e^-$ annihilation data to further strengthen lower
bounds on the partial lifetimes for the baryon-number-violating dinucleon
decays $nn \to e^+ e^-$ and $nn \to \mu^+\mu^-$.
| [
{
"created": "Tue, 26 May 2020 03:01:42 GMT",
"version": "v1"
}
] | 2020-08-07 | [
[
"Nussinov",
"Shmuel",
""
],
[
"Shrock",
"Robert",
""
]
] | We use $\bar p p$ and $e^+e^-$ annihilation data to further strengthen lower bounds on the partial lifetimes for the baryon-number-violating dinucleon decays $nn \to e^+ e^-$ and $nn \to \mu^+\mu^-$. |
2101.11160 | Wen-Chen Chang | Wen-Chen Chang, Randall Evan McClellan, Jen-Chieh Peng and Oleg
Teryaev | QCD effects in lepton angular distributions of Drell-Yan/$Z$ production
and jet discrimination | 7 pages, 2 figures; contribution to the proceedings of 40th
International Conference on High Energy physics (ICHEP2020), 28 July - 6
August 2020, Prague, Czech. arXiv admin note: text overlap with
arXiv:1907.11356 | null | 10.22323/1.390.0465 | null | hep-ph hep-ex nucl-ex | http://creativecommons.org/licenses/by/4.0/ | We present a comparison of data of lepton angular distributions of
Drell-Yan/$Z$ production with the fixed-order pQCD calculations by which the
baseline of pQCD effects is illustrated. As for the $Z$ production, we predict
that $A_0$ and $A_2$ for $Z$ plus single gluon-jet events are very different
from that of $Z$ plus single quark-jet events, allowing a new experimental tool
for checking various algorithms which attempt to discriminate quark jets from
gluon jets. Using an intuitive geometric approach, we show that the violation
of the Lam-Tung relation, appearing at large transverse-momentum region, is
attributed to the presence of a non-coplanarity effect. This interpretation is
consistent with the appearance of violation beyond LO-QCD effect.
| [
{
"created": "Wed, 27 Jan 2021 01:37:51 GMT",
"version": "v1"
}
] | 2022-09-21 | [
[
"Chang",
"Wen-Chen",
""
],
[
"McClellan",
"Randall Evan",
""
],
[
"Peng",
"Jen-Chieh",
""
],
[
"Teryaev",
"Oleg",
""
]
] | We present a comparison of data of lepton angular distributions of Drell-Yan/$Z$ production with the fixed-order pQCD calculations by which the baseline of pQCD effects is illustrated. As for the $Z$ production, we predict that $A_0$ and $A_2$ for $Z$ plus single gluon-jet events are very different from that of $Z$ plus single quark-jet events, allowing a new experimental tool for checking various algorithms which attempt to discriminate quark jets from gluon jets. Using an intuitive geometric approach, we show that the violation of the Lam-Tung relation, appearing at large transverse-momentum region, is attributed to the presence of a non-coplanarity effect. This interpretation is consistent with the appearance of violation beyond LO-QCD effect. |
1002.0410 | Kenji Yamada | Kenji Yamada | A Novel View of Exotic Hadrons and the Covariant ~U(12)-Classification
Scheme | 5 pages, To appear in proceedings of the XIII International
Conference on Hadron Spectroscopy, Nov. 29 - Dec. 4, 2009, Florida State
University | null | 10.1063/1.3483369 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I classify exotic hadrons into two types, "genuine" and "hidden" exotics, and
propose that the "hidden" exotics would be interpreted as "chiralons" in the
~U(12)_SF times O(3,1)_L-classification scheme of hadrons. Based upon this
conjecture I investigate the mass spectrum of 1S, 1P, and 2S states for the
ccbar system by use of a phenomenological mass formula with the spin-dependent
interactions and present possible assignments for exotic neutral
charmonium-like states which were recently discovered. It is also mentioned
that some J^PC-exotic states predicted in this scheme might correspond to those
found in a recent lattice QCD calculation of the charmonium spectrum.
| [
{
"created": "Tue, 2 Feb 2010 07:53:42 GMT",
"version": "v1"
}
] | 2015-05-18 | [
[
"Yamada",
"Kenji",
""
]
] | I classify exotic hadrons into two types, "genuine" and "hidden" exotics, and propose that the "hidden" exotics would be interpreted as "chiralons" in the ~U(12)_SF times O(3,1)_L-classification scheme of hadrons. Based upon this conjecture I investigate the mass spectrum of 1S, 1P, and 2S states for the ccbar system by use of a phenomenological mass formula with the spin-dependent interactions and present possible assignments for exotic neutral charmonium-like states which were recently discovered. It is also mentioned that some J^PC-exotic states predicted in this scheme might correspond to those found in a recent lattice QCD calculation of the charmonium spectrum. |
hep-ph/0106163 | Kawamura | Tetsuaki Kawamoto and Yoshiharu Kawamura | Symmetry Reduction, Gauge Transformation and Orbifold | 11 pages, Latex | null | null | null | hep-ph | null | We study a mechanism of symmetry reduction in a higher-dimensional field
theory upon orbifold compactification. Split multiplets appear unless all
components in a multiplet of a symmetry group have a common parity on an
orbifold. A gauge transformation property is also examined.
| [
{
"created": "Fri, 15 Jun 2001 08:17:51 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Jun 2001 06:00:27 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Kawamoto",
"Tetsuaki",
""
],
[
"Kawamura",
"Yoshiharu",
""
]
] | We study a mechanism of symmetry reduction in a higher-dimensional field theory upon orbifold compactification. Split multiplets appear unless all components in a multiplet of a symmetry group have a common parity on an orbifold. A gauge transformation property is also examined. |
0903.0356 | Roberto Pittau | P. Draggiotis, M.V. Garzelli, C.G. Papadopoulos, R. Pittau | Feynman Rules for the Rational Part of the QCD 1-loop amplitudes | 18 pages, 11 figures. Misprints corrected in Appendix A. Version to
be published in JHEP | JHEP 0904:072,2009 | 10.1088/1126-6708/2009/04/072 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute the complete set of Feynman Rules producing the Rational Terms of
kind R_2 needed to perform any QCD 1-loop calculation. We also explicitly check
that in order to account for the entire R_2 contribution, even in case of
processes with more than four external legs, only up to four-point vertices are
needed. Our results are expressed both in the 't Hooft Veltman regularization
scheme and in the Four Dimensional Helicity scheme, using explicit color
configurations as well as the color connection language.
| [
{
"created": "Mon, 2 Mar 2009 18:57:08 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Apr 2009 09:22:40 GMT",
"version": "v2"
}
] | 2009-11-25 | [
[
"Draggiotis",
"P.",
""
],
[
"Garzelli",
"M. V.",
""
],
[
"Papadopoulos",
"C. G.",
""
],
[
"Pittau",
"R.",
""
]
] | We compute the complete set of Feynman Rules producing the Rational Terms of kind R_2 needed to perform any QCD 1-loop calculation. We also explicitly check that in order to account for the entire R_2 contribution, even in case of processes with more than four external legs, only up to four-point vertices are needed. Our results are expressed both in the 't Hooft Veltman regularization scheme and in the Four Dimensional Helicity scheme, using explicit color configurations as well as the color connection language. |
hep-ph/9602229 | H. Holtmann | H. Holtmann, G. Levman, N.N. Nikolaev, A. Szczurek and J. Speth | How to measure the pion structure function at HERA | 12 pages written in ReVTeX and 4 Postscript figures | Phys.Lett.B338:393,1995 | null | KFA-IKP-(TH)-12-1995 | hep-ph | null | We suggest a method of determination of the pion structure function down to x
\simeq 10^{-4} based on semi-exclusive deep inelastic scattering off protons.
The idea is to exploit the nonperturbative \pi N$ and \pi\Delta Fock components
of the nucleon, which contribute significantly to deep inelastic scattering and
dominate the fragmentation of protons into fast neutrons and deltas. The
intrinsic factorization properties of the semi-exclusive cross section give a
good test for the validity of this approach.
| [
{
"created": "Tue, 6 Feb 1996 11:12:50 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Holtmann",
"H.",
""
],
[
"Levman",
"G.",
""
],
[
"Nikolaev",
"N. N.",
""
],
[
"Szczurek",
"A.",
""
],
[
"Speth",
"J.",
""
]
] | We suggest a method of determination of the pion structure function down to x \simeq 10^{-4} based on semi-exclusive deep inelastic scattering off protons. The idea is to exploit the nonperturbative \pi N$ and \pi\Delta Fock components of the nucleon, which contribute significantly to deep inelastic scattering and dominate the fragmentation of protons into fast neutrons and deltas. The intrinsic factorization properties of the semi-exclusive cross section give a good test for the validity of this approach. |
1306.6372 | Cristina Volpe | D. V\"a\"an\"anen, C. Volpe | Linearizing neutrino evolution equations including neutrino-antineutrino
pairing correlations | 16 pages, 1 figure, minor corrections | null | 10.1103/PhysRevD.88.065003 | null | hep-ph astro-ph.SR nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We linearize the neutrino mean-field evolution equations describing the
neutrino propagation in a background of matter and of neutrinos, using
techniques from many-body microscopic approaches. The procedure leads to an
eigenvalue equation that allows to identify instabilities in the evolution,
associated with a change of the curvature of the neutrino energy-density
surface. Our result includes all contributions from the neutrino Hamiltonian
and is generalizable to linearize the equations of motion at an arbitrary point
of the evolution. We then consider the extended equations that comprise the
normal mean field as well as the abnormal mean field that is associated with
neutrino-antineutrino pairing correlations. We first re-derive the extended
neutrino Hamiltonian and show that such a Hamiltonian can be diagonalized by
introducing a generalized Bogoliubov-Valatin transformation with quasi-particle
operators that mix neutrinos and antineutrinos. We give the eigenvalue
equations that determine the energies of the quasi-particles eigenstates.
Finally we derive the eigenvalue equation of the extended equations of motion,
valid in the small amplitude approximation. Our results apply to an arbitrary
number of neutrino families.
| [
{
"created": "Wed, 26 Jun 2013 22:37:04 GMT",
"version": "v1"
},
{
"created": "Fri, 29 Nov 2013 23:01:31 GMT",
"version": "v2"
}
] | 2015-06-16 | [
[
"Väänänen",
"D.",
""
],
[
"Volpe",
"C.",
""
]
] | We linearize the neutrino mean-field evolution equations describing the neutrino propagation in a background of matter and of neutrinos, using techniques from many-body microscopic approaches. The procedure leads to an eigenvalue equation that allows to identify instabilities in the evolution, associated with a change of the curvature of the neutrino energy-density surface. Our result includes all contributions from the neutrino Hamiltonian and is generalizable to linearize the equations of motion at an arbitrary point of the evolution. We then consider the extended equations that comprise the normal mean field as well as the abnormal mean field that is associated with neutrino-antineutrino pairing correlations. We first re-derive the extended neutrino Hamiltonian and show that such a Hamiltonian can be diagonalized by introducing a generalized Bogoliubov-Valatin transformation with quasi-particle operators that mix neutrinos and antineutrinos. We give the eigenvalue equations that determine the energies of the quasi-particles eigenstates. Finally we derive the eigenvalue equation of the extended equations of motion, valid in the small amplitude approximation. Our results apply to an arbitrary number of neutrino families. |
2010.11222 | Arkaitz Rodas | J.R. Pel\'aez, A. Rodas | Dispersive $\pi K\to \pi K$ and $\pi \pi \to K \bar{K}$ amplitudes from
scattering data, threshold parameters and the lightest strange resonance
$\kappa$ or $K^*_0(700)$ | 148 pages, 53 figures. Further clarifications, discussions and
references added. Version published in Physics Reports | Phys.Rept. 969 (2022) 1-126 | 10.1016/j.physrep.2022.03.004 | JLAB-THY-20-3276 | hep-ph hep-ex hep-lat nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the simultaneous dispersive analyses of $\pi K\to \pi K$ and $\pi
\pi \to K \bar{K}$ scattering data and the $\kappa/K^*_0(700)$ resonance. The
unprecedented statistics of present and future Hadron Experiments, modern
Lattice QCD calculations, and the wealth of new states and decays, require such
precise and model-independent analyses to describe final state interactions. We
review the existing and often conflicting data and explain in detail the
derivation of the relevant dispersion relations, maximizing their applicability
range. Next, we review and extend the caveats on some data, showing their
inconsistency with dispersion relations. Our main result is the derivation and
compilation of precise amplitude parameterizations constrained by several $\pi
K\to \pi K$ and $\pi \pi \to K \bar{K}$ dispersion relations. These constrained
parameterizations are easily implementable and provide the rigor and accuracy
needed for modern experimental and phenomenological Hadron Physics. As
applications, after reviewing their status and interest, we will provide new
precise threshold and subthreshold parameters and review our dispersive
determination of the controversial $\kappa/K^*_0(700)$ resonance and other
light-strange resonances.
| [
{
"created": "Wed, 21 Oct 2020 18:04:07 GMT",
"version": "v1"
},
{
"created": "Fri, 10 Jun 2022 23:36:34 GMT",
"version": "v2"
}
] | 2022-06-14 | [
[
"Peláez",
"J. R.",
""
],
[
"Rodas",
"A.",
""
]
] | We discuss the simultaneous dispersive analyses of $\pi K\to \pi K$ and $\pi \pi \to K \bar{K}$ scattering data and the $\kappa/K^*_0(700)$ resonance. The unprecedented statistics of present and future Hadron Experiments, modern Lattice QCD calculations, and the wealth of new states and decays, require such precise and model-independent analyses to describe final state interactions. We review the existing and often conflicting data and explain in detail the derivation of the relevant dispersion relations, maximizing their applicability range. Next, we review and extend the caveats on some data, showing their inconsistency with dispersion relations. Our main result is the derivation and compilation of precise amplitude parameterizations constrained by several $\pi K\to \pi K$ and $\pi \pi \to K \bar{K}$ dispersion relations. These constrained parameterizations are easily implementable and provide the rigor and accuracy needed for modern experimental and phenomenological Hadron Physics. As applications, after reviewing their status and interest, we will provide new precise threshold and subthreshold parameters and review our dispersive determination of the controversial $\kappa/K^*_0(700)$ resonance and other light-strange resonances. |
1601.04284 | Flavio Pereira | F. I. M. Pereira | On the anomalous mass defect of strange stars in the Field Correlator
Method | 24 pages, 6 figures | null | 10.1016/j.nuclphysa.2016.04.020 | null | hep-ph astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate general aspects of the mass defects of strange stars in the
context of the Field Correlator Method, without magnetic field. The main
parameters of the model that enter the corresponding nonperturbative equation
of state of the quark gluon plasma are the gluon condensate $G_2$ and the large
distance static $Q{\bar Q}$ potential $V_1$. We calculate mass defects of
stellar configurations in the central density range $11<\log\rho_c<18$. In
general, the mass defects are strongly dependent on the model parameters. For a
large range of values of $G_2$ and $V_1$, we obtain anomalous mass defects with
magnitudes around $10^{53}\,$erg\,, of the same order of the observed energies
of gamma-ray bursts and neutrino emissions in SN1987A, and of the theoretically
predicted energies of the quark-novae explosions.
| [
{
"created": "Sun, 17 Jan 2016 12:35:44 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Apr 2016 17:50:22 GMT",
"version": "v2"
}
] | 2023-05-17 | [
[
"Pereira",
"F. I. M.",
""
]
] | We investigate general aspects of the mass defects of strange stars in the context of the Field Correlator Method, without magnetic field. The main parameters of the model that enter the corresponding nonperturbative equation of state of the quark gluon plasma are the gluon condensate $G_2$ and the large distance static $Q{\bar Q}$ potential $V_1$. We calculate mass defects of stellar configurations in the central density range $11<\log\rho_c<18$. In general, the mass defects are strongly dependent on the model parameters. For a large range of values of $G_2$ and $V_1$, we obtain anomalous mass defects with magnitudes around $10^{53}\,$erg\,, of the same order of the observed energies of gamma-ray bursts and neutrino emissions in SN1987A, and of the theoretically predicted energies of the quark-novae explosions. |
hep-ph/9907514 | Johan Bijnens | Johan Bijnens (Lund) | I : Chiral Perturbation for Kaons II: The $\Delta I=1/2$-rule in the
Chiral Limit | Talk presented at Kaon99, Chicago, June 20-27, 1999, 11 pages | null | null | LU TP 99-19 | hep-ph | null | I : Chiral Perturbation Theory is introduced and its applications to
semileptonic and nonleptonic kaon decays are discussed.
II: The method of large $N_c$ is used to calculate $K\to\pi\pi$ nonleptonic
matrix elements, in particular the matching procedure between long and
short-distance evolution that takes all scheme dependence correctly into
account is discussed. Numerical results reproduce the $\Delta I=1/2$ rule
without the introduction of any free parameters.
| [
{
"created": "Tue, 27 Jul 1999 14:39:22 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Bijnens",
"Johan",
"",
"Lund"
]
] | I : Chiral Perturbation Theory is introduced and its applications to semileptonic and nonleptonic kaon decays are discussed. II: The method of large $N_c$ is used to calculate $K\to\pi\pi$ nonleptonic matrix elements, in particular the matching procedure between long and short-distance evolution that takes all scheme dependence correctly into account is discussed. Numerical results reproduce the $\Delta I=1/2$ rule without the introduction of any free parameters. |
hep-ph/9811222 | Dmitri Kharzeev | John Ellis and Dmitri Kharzeev | The Glueball Filter in Central Production and Broken Scale Invariance | 9 pages, 2 figures, LaTeX2e | null | null | CERN-TH/98-349 | hep-ph | null | We propose a possible explanation of the kinematical dependence of the
central production of the scalar glueball candidate observed recently by the
WA91 and WA102 Collaborations, and discussed by Close and Kirk, in the context
of the broken scale invariance of QCD. The dependences of glueball production
on the transverse momenta and azimuthal angles of the final-state protons may
be related to the structure of the trace anomaly in QCD.
| [
{
"created": "Mon, 2 Nov 1998 20:31:00 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Dec 1998 21:34:00 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Ellis",
"John",
""
],
[
"Kharzeev",
"Dmitri",
""
]
] | We propose a possible explanation of the kinematical dependence of the central production of the scalar glueball candidate observed recently by the WA91 and WA102 Collaborations, and discussed by Close and Kirk, in the context of the broken scale invariance of QCD. The dependences of glueball production on the transverse momenta and azimuthal angles of the final-state protons may be related to the structure of the trace anomaly in QCD. |
2310.19881 | So Chigusa | Christian W. Bauer, So Chigusa, Masahito Yamazaki | Quantum Parton Shower with Kinematics | 14 pages, 8 figures | null | null | null | hep-ph quant-ph | http://creativecommons.org/licenses/by/4.0/ | Parton showers which can efficiently incorporate quantum interference effects
have been shown to be run efficiently on quantum computers. However, so far
these quantum parton showers did not include the full kinematical information
required to reconstruct an event, which in classical parton showers requires
the use of a veto algorithm. In this work, we show that adding one extra
assumption about the discretization of the evolution variable allows to
construct a quantum veto algorithm, which reproduces the full quantum
interference in the event, and allows to include kinematical effects. We
finally show that for certain initial states the quantum interference effects
generated in this veto algorithm are classically tractable, such that an
efficient classical algorithm can be devised.
| [
{
"created": "Mon, 30 Oct 2023 18:00:03 GMT",
"version": "v1"
}
] | 2023-11-01 | [
[
"Bauer",
"Christian W.",
""
],
[
"Chigusa",
"So",
""
],
[
"Yamazaki",
"Masahito",
""
]
] | Parton showers which can efficiently incorporate quantum interference effects have been shown to be run efficiently on quantum computers. However, so far these quantum parton showers did not include the full kinematical information required to reconstruct an event, which in classical parton showers requires the use of a veto algorithm. In this work, we show that adding one extra assumption about the discretization of the evolution variable allows to construct a quantum veto algorithm, which reproduces the full quantum interference in the event, and allows to include kinematical effects. We finally show that for certain initial states the quantum interference effects generated in this veto algorithm are classically tractable, such that an efficient classical algorithm can be devised. |
hep-ph/9607332 | Hai-Yang Cheng | Hai-Yang Cheng, Chi-Yee Cheung, Chien-Wen Hwang | Mesonic Form Factors and the Isgur-Wise Function on the Light-Front | 49 pages, 11 figures | Phys.Rev. D55 (1997) 1559-1577 | 10.1103/PhysRevD.55.1559 | IP-ASTP-04-96 | hep-ph | null | Within the light-front framework, form factors for $P\to P$ and $P\to V$
transitions ($P$: pseudoscalar meson, $V$: vector meson) due to the
valence-quark configuration are calculated directly in the entire physical
range of momentum transfer. The behavior of form factors in the infinite quark
mass limit are examined to see if the requirements of heavy-quark symmetry are
fulfilled. We find that the Bauer-Stech-Wirbel type of light-front wave
function fails to give a correct normalization for the Isgur-Wise function at
zero recoil in $P\to V$ transition. Some of the $P\to V$ form factors are found
to depend on the recoiling direction of the daughter mesons relative to their
parents. Thus, the inclusion of the non-valence configuration arising from
quark-pair creation is mandatory in order to ensure that the physical form
factors are independent of the recoiling direction. The main feature of the
non-valence contribution is discussed.
| [
{
"created": "Tue, 16 Jul 1996 20:24:11 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Cheng",
"Hai-Yang",
""
],
[
"Cheung",
"Chi-Yee",
""
],
[
"Hwang",
"Chien-Wen",
""
]
] | Within the light-front framework, form factors for $P\to P$ and $P\to V$ transitions ($P$: pseudoscalar meson, $V$: vector meson) due to the valence-quark configuration are calculated directly in the entire physical range of momentum transfer. The behavior of form factors in the infinite quark mass limit are examined to see if the requirements of heavy-quark symmetry are fulfilled. We find that the Bauer-Stech-Wirbel type of light-front wave function fails to give a correct normalization for the Isgur-Wise function at zero recoil in $P\to V$ transition. Some of the $P\to V$ form factors are found to depend on the recoiling direction of the daughter mesons relative to their parents. Thus, the inclusion of the non-valence configuration arising from quark-pair creation is mandatory in order to ensure that the physical form factors are independent of the recoiling direction. The main feature of the non-valence contribution is discussed. |
2106.12582 | Marco Fedele | Luc Darm\'e, Marco Fedele, Kamila Kowalska, Enrico Maria Sessolo | Flavour anomalies and the muon $g-2$ from feebly interacting particles | 32 pages, 4 figures. Typos corrected, published version | JHEP 03 (2022) 085 | 10.1007/JHEP03(2022)085 | TTP21-020, P3H-21-047 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We perform a phenomenological analysis of simplified models of light, feebly
interacting particles~(FIPs)that can provide a combined explanation of the
anomalies in $b\to s l^+ l ^-$ transitions at LHCb and the anomalous magnetic
moment of the muon. Different scenarios are categorised according to the
explicit momentum dependence of the FIP coupling to the $b-s$ and $\mu-\mu$
vector currents and they are subject to several constraints from flavour and
precision physics. We show that viable combined solutions to the muon $g-2$ and
flavour anomalies exist with the exchange of a vector FIP with mass larger than
$4 \,\textrm{GeV}$. Interestingly, the LHC has the potential to probe this
region of the parameter space by increasing the precision of the $Z\to 4\mu$
cross-section measurement. Conversely, we find that solutions based on the
exchange of a lighter vector, in the $m_V < 1\,\textrm{GeV}$ range, are
essentially excluded by a combination of $B\to K +\textrm{invisible}$ and
$W$-decay precision bounds.
| [
{
"created": "Wed, 23 Jun 2021 18:00:00 GMT",
"version": "v1"
},
{
"created": "Fri, 26 Nov 2021 10:58:18 GMT",
"version": "v2"
},
{
"created": "Sun, 20 Mar 2022 16:51:57 GMT",
"version": "v3"
}
] | 2022-03-22 | [
[
"Darmé",
"Luc",
""
],
[
"Fedele",
"Marco",
""
],
[
"Kowalska",
"Kamila",
""
],
[
"Sessolo",
"Enrico Maria",
""
]
] | We perform a phenomenological analysis of simplified models of light, feebly interacting particles~(FIPs)that can provide a combined explanation of the anomalies in $b\to s l^+ l ^-$ transitions at LHCb and the anomalous magnetic moment of the muon. Different scenarios are categorised according to the explicit momentum dependence of the FIP coupling to the $b-s$ and $\mu-\mu$ vector currents and they are subject to several constraints from flavour and precision physics. We show that viable combined solutions to the muon $g-2$ and flavour anomalies exist with the exchange of a vector FIP with mass larger than $4 \,\textrm{GeV}$. Interestingly, the LHC has the potential to probe this region of the parameter space by increasing the precision of the $Z\to 4\mu$ cross-section measurement. Conversely, we find that solutions based on the exchange of a lighter vector, in the $m_V < 1\,\textrm{GeV}$ range, are essentially excluded by a combination of $B\to K +\textrm{invisible}$ and $W$-decay precision bounds. |
hep-ph/9711508 | Andrzej Bialas | A. Bialas, W. Czyz (Jagellonian University) | Shadowing of Virtual Photons in Nuclei at Small $x_{Bj}$ in the QCD
Dipole Picture | 17 pages Latex2e file, To be published in Acta Physica Polonica B,
no. 3 (1998) | Acta Phys.Polon. B29 (1998) 651-666 | null | TPJU-10/97 | hep-ph | null | Compact and well defined formulae for the shadow of the virtual photon
interacting with a large nucleus at small $x_{Bj}$ are given in the QCD dipole
picture. Two classes of contributions are considered: (a) quasi-elastic
interaction of the $q\bar{q}$ dipole and (b) multi-pomeron coupling.
| [
{
"created": "Fri, 28 Nov 1997 12:00:51 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Bialas",
"A.",
"",
"Jagellonian University"
],
[
"Czyz",
"W.",
"",
"Jagellonian University"
]
] | Compact and well defined formulae for the shadow of the virtual photon interacting with a large nucleus at small $x_{Bj}$ are given in the QCD dipole picture. Two classes of contributions are considered: (a) quasi-elastic interaction of the $q\bar{q}$ dipole and (b) multi-pomeron coupling. |
2109.13779 | Hiroshi Okada | Hiroshi Okada, Yong-hui Qi | Zee-Babu model in modular $A_4$ symmetry | 22 pages, 4 tables, 3 figures. arXiv admin note: text overlap with
arXiv:2012.11156 | null | null | APCTP Pre2021-022 | hep-ph | http://creativecommons.org/publicdomain/zero/1.0/ | We study a Zee-Babu model in a modular $A_4$ flavor symmetry, in which we
search for several predictions such as phases, sum of neutrino masses, and
neutrinoless double beta decay, satisfying neutrino oscillation data in a
minimum framework of the charge assignments of modular weight. We perform
$\Delta \chi^2$ analysis to get our results and find $\tau$ is localized nearby
at one of the fixed points of $i\times \infty$ for both of normal and inverted
mass hierarchies.
| [
{
"created": "Tue, 28 Sep 2021 14:58:10 GMT",
"version": "v1"
},
{
"created": "Sat, 16 Oct 2021 06:34:22 GMT",
"version": "v2"
}
] | 2022-01-18 | [
[
"Okada",
"Hiroshi",
""
],
[
"Qi",
"Yong-hui",
""
]
] | We study a Zee-Babu model in a modular $A_4$ flavor symmetry, in which we search for several predictions such as phases, sum of neutrino masses, and neutrinoless double beta decay, satisfying neutrino oscillation data in a minimum framework of the charge assignments of modular weight. We perform $\Delta \chi^2$ analysis to get our results and find $\tau$ is localized nearby at one of the fixed points of $i\times \infty$ for both of normal and inverted mass hierarchies. |
hep-ph/9905564 | Sergey Troshin | S. M. Troshin, N. E. Tyurin | Unitarity and nonperturbative effects in the spin structure functions at
small $x$ | 4 pages, 1 figure, talk given by S. Troshin at the DESY Workshop:
Polarized Protons at High Energies - Accelerator Challenges and Physics
Opportunities, Hamburg 17-20 May 1999 | null | null | null | hep-ph | null | We consider low-$x$ behavior of the spin structure functions $g_1(x)$ and
$h_1(x)$ in the unitarized chiral quark model that combines the ideas on
constituent quark structure of hadrons with a geometrical scattering picture
and unitarity. A nondiffractive singular low-$x$ dependence of $g^p_1(x)$ and
$g_1^n(x)$ is obtained and a diffractive type smooth behavior of $h_1(x)$ is
predicted at small $x$.
| [
{
"created": "Mon, 31 May 1999 12:36:09 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Troshin",
"S. M.",
""
],
[
"Tyurin",
"N. E.",
""
]
] | We consider low-$x$ behavior of the spin structure functions $g_1(x)$ and $h_1(x)$ in the unitarized chiral quark model that combines the ideas on constituent quark structure of hadrons with a geometrical scattering picture and unitarity. A nondiffractive singular low-$x$ dependence of $g^p_1(x)$ and $g_1^n(x)$ is obtained and a diffractive type smooth behavior of $h_1(x)$ is predicted at small $x$. |
0906.4052 | Gizo Nanava | G. Nanava (1), Qingjun Xu (2) and Z. Was (2 and 3) ((1) Bonn U., (2)
Cracow, INP, (3) CERN) | Matching NLO parton shower matrix element with exact phase space: case
of W -> l nu (gamma) and gamma^* -> pi^+pi^-(gamma) | 24 pages | Eur.Phys.J.C70:673-688,2010 | 10.1140/epjc/s10052-010-1454-8 | IFJPAN-IV-2009-1, CERN-PH-TH/2009-092 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The PHOTOS Monte Carlo is often used for simulation of QED effects in decay
of intermediate particles and resonances. Momenta are generated in such a way
that samples of events cover the whole bremsstrahlung phase space. With the
help of selection cuts, experimental acceptance can be then taken into account.
The program is based on an exact multiphoton phase space. Crude matrix element
is obtained by iteration of a universal multidimensional kernel. It ensures
exact distribution in the soft photon region. Algorithm is compatible with
exclusive exponentiation. To evaluate the program's precision, it is necessary
to control the kernel with the help of perturbative results. If available,
kernel is constructed from the exact first order matrix element. This ensures
that all terms necessary for non-leading logarithms are taken into account. In
the present paper we will focus on the W -> l nu and gamma^* -> pi^+ pi^-
decays. The Born level cross sections for both processes approach zero in some
points of the phase space. A process dependent compensating weight is
constructed to incorporate the exact matrix element, but is recommended for use
in tests only. In the hard photon region, where scalar QED is not expected to
be reliable, the compensating weight for gamma^* decay can be large. With
respect to the total rate, the effect remains at the permille level. It is
nonetheless of interest. The terms leading to the effect are analogous to some
terms appearing in QCD. The present paper can be understood either as a
contribution to discussion on how to match two collinear emission chains
resulting from charged sources in a way compatible with the exact and complete
phase space, exclusive exponentiation and the first order matrix element of QED
(scalar QED), or as the practical study of predictions for accelerator
experiments.
| [
{
"created": "Mon, 22 Jun 2009 16:33:44 GMT",
"version": "v1"
},
{
"created": "Sun, 30 May 2010 16:31:08 GMT",
"version": "v2"
}
] | 2010-12-15 | [
[
"Nanava",
"G.",
"",
"2 and 3"
],
[
"Xu",
"Qingjun",
"",
"2 and 3"
],
[
"Was",
"Z.",
"",
"2 and 3"
]
] | The PHOTOS Monte Carlo is often used for simulation of QED effects in decay of intermediate particles and resonances. Momenta are generated in such a way that samples of events cover the whole bremsstrahlung phase space. With the help of selection cuts, experimental acceptance can be then taken into account. The program is based on an exact multiphoton phase space. Crude matrix element is obtained by iteration of a universal multidimensional kernel. It ensures exact distribution in the soft photon region. Algorithm is compatible with exclusive exponentiation. To evaluate the program's precision, it is necessary to control the kernel with the help of perturbative results. If available, kernel is constructed from the exact first order matrix element. This ensures that all terms necessary for non-leading logarithms are taken into account. In the present paper we will focus on the W -> l nu and gamma^* -> pi^+ pi^- decays. The Born level cross sections for both processes approach zero in some points of the phase space. A process dependent compensating weight is constructed to incorporate the exact matrix element, but is recommended for use in tests only. In the hard photon region, where scalar QED is not expected to be reliable, the compensating weight for gamma^* decay can be large. With respect to the total rate, the effect remains at the permille level. It is nonetheless of interest. The terms leading to the effect are analogous to some terms appearing in QCD. The present paper can be understood either as a contribution to discussion on how to match two collinear emission chains resulting from charged sources in a way compatible with the exact and complete phase space, exclusive exponentiation and the first order matrix element of QED (scalar QED), or as the practical study of predictions for accelerator experiments. |
hep-ph/0201262 | Danny Marfatia | V. Barger, S.L. Glashow, D. Marfatia and K. Whisnant | Neutrinoless double beta decay can constrain neutrino dark matter | Version to appear in PLB | Phys.Lett.B532:15-18,2002 | 10.1016/S0370-2693(02)01531-9 | MADPH-02-1254, AMES-HET-02-01 | hep-ph astro-ph hep-ex | null | We examine how constraints can be placed on the neutrino component of dark
matter by an accurate measurement of neutrinoless double beta
($0\nu\beta\beta$) decay and the solar oscillation amplitude. We comment on the
alleged evidence for $0\nu\beta\beta$ decay.
| [
{
"created": "Mon, 28 Jan 2002 22:49:34 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Feb 2002 19:35:23 GMT",
"version": "v2"
}
] | 2017-08-23 | [
[
"Barger",
"V.",
""
],
[
"Glashow",
"S. L.",
""
],
[
"Marfatia",
"D.",
""
],
[
"Whisnant",
"K.",
""
]
] | We examine how constraints can be placed on the neutrino component of dark matter by an accurate measurement of neutrinoless double beta ($0\nu\beta\beta$) decay and the solar oscillation amplitude. We comment on the alleged evidence for $0\nu\beta\beta$ decay. |
0807.1008 | Bernd Kniehl | Joachim Brod, Frank Fugel, Bernd A. Kniehl | Two-Loop Electroweak Corrections to the A^0 gamma gamma and A^0 g g
Couplings of the CP-Odd Higgs Boson | 27 pages, 11 figures | Nucl.Phys.B807:188-209,2009 | 10.1016/j.nuclphysb.2008.08.021 | DESY 08-071, TTP 08-20 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using the asymptotic-expansion technique, we compute the dominant two-loop
electroweak corrections, of O(G_F m_t^2), to production and decay via a pair of
photons or gluons of the CP-odd Higgs boson A^0 in a two-Higgs-doublet model
with low- to intermediate values of the Higgs-boson masses and ratio
tan(beta)=v_2/v_1 of the vacuum expectation values. We also study the influence
of a sequential heavy-fermion generation. The appearance of three gamma_5
matrices in closed fermion loops requires special care in the dimensional
regularisation of ultraviolet divergences. The finite renormalisation constant
for the pseudoscalar current effectively restoring the anticommutativity of the
gamma_5 matrix, familiar from perturbative quantum chromodynamics, is found not
to receive a correction in this order. We also revisit the dominant two-loop
electroweak correction to the H -> gamma gamma decay width in the standard
model with a fourth fermion generation.
| [
{
"created": "Mon, 7 Jul 2008 13:05:26 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Brod",
"Joachim",
""
],
[
"Fugel",
"Frank",
""
],
[
"Kniehl",
"Bernd A.",
""
]
] | Using the asymptotic-expansion technique, we compute the dominant two-loop electroweak corrections, of O(G_F m_t^2), to production and decay via a pair of photons or gluons of the CP-odd Higgs boson A^0 in a two-Higgs-doublet model with low- to intermediate values of the Higgs-boson masses and ratio tan(beta)=v_2/v_1 of the vacuum expectation values. We also study the influence of a sequential heavy-fermion generation. The appearance of three gamma_5 matrices in closed fermion loops requires special care in the dimensional regularisation of ultraviolet divergences. The finite renormalisation constant for the pseudoscalar current effectively restoring the anticommutativity of the gamma_5 matrix, familiar from perturbative quantum chromodynamics, is found not to receive a correction in this order. We also revisit the dominant two-loop electroweak correction to the H -> gamma gamma decay width in the standard model with a fourth fermion generation. |
2009.14295 | Avi Friedlander | Avi Friedlander, Ian Banta, James M. Cline, David Tucker-Smith | Wall speed and shape in singlet-assisted strong electroweak phase
transitions | 19 pages, 15 figures | Phys. Rev. D 103, 055020 (2021) | 10.1103/PhysRevD.103.055020 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Models with singlet fields coupling to the Higgs can enable a strongly first
order electroweak phase transition, of interest for baryogenesis and gravity
waves. We improve on previous attempts to self-consistently solve for the
bubble wall properties -- wall speed $v_w$ and shape -- in a highly predictive
class of models with $Z_2$-symmetric singlet potentials. A new algorithm is
implemented to determine $v_w$ and the wall profiles throughout the singlet
parameter space in the case of subsonic walls, focusing on models with strong
enough phase transitions to satisfy the sphaleron washout constraint for
electroweak baryogenesis. We find speeds as low as $v_w \cong 0.1$ in our scan
over parameter space, and the singlet must be relatively light to have a
subsonic wall, $m_s \lesssim 135$ GeV.
| [
{
"created": "Tue, 29 Sep 2020 20:36:01 GMT",
"version": "v1"
},
{
"created": "Sun, 28 Feb 2021 17:36:09 GMT",
"version": "v2"
}
] | 2021-03-31 | [
[
"Friedlander",
"Avi",
""
],
[
"Banta",
"Ian",
""
],
[
"Cline",
"James M.",
""
],
[
"Tucker-Smith",
"David",
""
]
] | Models with singlet fields coupling to the Higgs can enable a strongly first order electroweak phase transition, of interest for baryogenesis and gravity waves. We improve on previous attempts to self-consistently solve for the bubble wall properties -- wall speed $v_w$ and shape -- in a highly predictive class of models with $Z_2$-symmetric singlet potentials. A new algorithm is implemented to determine $v_w$ and the wall profiles throughout the singlet parameter space in the case of subsonic walls, focusing on models with strong enough phase transitions to satisfy the sphaleron washout constraint for electroweak baryogenesis. We find speeds as low as $v_w \cong 0.1$ in our scan over parameter space, and the singlet must be relatively light to have a subsonic wall, $m_s \lesssim 135$ GeV. |
hep-ph/0103044 | Frank Daniel Steffen | Frank D. Steffen and Markus H. Thoma | Hard Thermal Photon Production in Relativistic Heavy Ion Collisions | 20 pages with 8 figures. v3: Erratum to [Phys. Lett. B 510 (2001) 98]
with correctly labeled Figs. 2, 4, and 5 added | Phys.Lett.B510:98-106,2001; Erratum-ibid.B660:604-606,2008 | 10.1016/S0370-2693(01)00525-1 10.1016/j.physletb.2007.11.020 | CERN-TH/2001-080, HD-THEP-01-13, MPP-2007-113 | hep-ph nucl-th | null | The recent status of hard thermal photon production in relativistic heavy ion
collisions is reviewed and the current rates are presented with emphasis on
corrected bremsstrahlung processes in the quark-gluon plasma (QGP) and
quark-hadron duality. Employing Bjorken hydrodynamics with an EOS supporting
the phase transition from QGP to hot hadron gas (HHG), thermal photon spectra
are computed. For SPS 158 GeV Pb+Pb collisions, comparison with other
theoretical results and the WA98 direct photon data indicates significant
contributions due to prompt photons. Extrapolating the presented approach to
RHIC and LHC experiments, predictions of the thermal photon spectrum show a QGP
outshining the HHG in the high-pT-region.
| [
{
"created": "Sun, 4 Mar 2001 22:54:24 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Mar 2001 10:34:00 GMT",
"version": "v2"
},
{
"created": "Mon, 27 Aug 2007 16:39:05 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Steffen",
"Frank D.",
""
],
[
"Thoma",
"Markus H.",
""
]
] | The recent status of hard thermal photon production in relativistic heavy ion collisions is reviewed and the current rates are presented with emphasis on corrected bremsstrahlung processes in the quark-gluon plasma (QGP) and quark-hadron duality. Employing Bjorken hydrodynamics with an EOS supporting the phase transition from QGP to hot hadron gas (HHG), thermal photon spectra are computed. For SPS 158 GeV Pb+Pb collisions, comparison with other theoretical results and the WA98 direct photon data indicates significant contributions due to prompt photons. Extrapolating the presented approach to RHIC and LHC experiments, predictions of the thermal photon spectrum show a QGP outshining the HHG in the high-pT-region. |
1205.1438 | Rahul Sinha | Diganta Das, Rahul Sinha | New Physics Effects and Hadronic Form Factor Uncertainties in B -> K^*
l^+ l^- | 26 pages, 9 figures (20 pdf figure files). Several typos corrected | null | 10.1103/PhysRevD.86.056006 | IMSc-2012-5-10 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is well known that New Physics can contribute to weak decays of heavy
mesons via virtual processes during its decays. The discovery of New Physics,
using such decays is made difficult due to intractable strong interaction
effects needed to describe it. Modes such as B -> K^* l^+ l^- offer an
advantage as they provide a multitude of observables via angular analysis. We
show how the multitude of "related observables" obtained from B -> K^* l^+ l^-,
can provide many new "clean tests" of the Standard Model. The hallmark of these
tests is that several of them are independent of the unknown universal form
factors in heavy quark effective theory. We derive a relation between
observables that is free of form factors and Wilson coefficients, the violation
of which will be an unambiguous signal of New Physics. We also derive relations
between observables and form factors that are independent of Wilson
coefficients and enable verification of hadronic estimates. We show how form
factor ratios can be measured directly from helicity fraction with out any
assumptions what so ever. We find that the allowed parameter space for
observables is very tightly constrained in Standard Model, thereby providing
clean signals of New Physics. We examine both the large-recoil and low-recoil
regions of the K^* meson and point out special features and derive relations
between observables valid in the two limits. In the large-recoil regions
several of the relations are unaffected by corrections to all orders in
\alpha_s. We present yet another new relation involving only observables that
would verify the validity of the relations between form-factors assumed in the
low-recoil region. The several relations and constraints derived will provide
unambiguous signals of New Physics if it contributes to these decays.
| [
{
"created": "Mon, 7 May 2012 15:54:12 GMT",
"version": "v1"
},
{
"created": "Tue, 15 May 2012 09:38:12 GMT",
"version": "v2"
}
] | 2013-05-30 | [
[
"Das",
"Diganta",
""
],
[
"Sinha",
"Rahul",
""
]
] | It is well known that New Physics can contribute to weak decays of heavy mesons via virtual processes during its decays. The discovery of New Physics, using such decays is made difficult due to intractable strong interaction effects needed to describe it. Modes such as B -> K^* l^+ l^- offer an advantage as they provide a multitude of observables via angular analysis. We show how the multitude of "related observables" obtained from B -> K^* l^+ l^-, can provide many new "clean tests" of the Standard Model. The hallmark of these tests is that several of them are independent of the unknown universal form factors in heavy quark effective theory. We derive a relation between observables that is free of form factors and Wilson coefficients, the violation of which will be an unambiguous signal of New Physics. We also derive relations between observables and form factors that are independent of Wilson coefficients and enable verification of hadronic estimates. We show how form factor ratios can be measured directly from helicity fraction with out any assumptions what so ever. We find that the allowed parameter space for observables is very tightly constrained in Standard Model, thereby providing clean signals of New Physics. We examine both the large-recoil and low-recoil regions of the K^* meson and point out special features and derive relations between observables valid in the two limits. In the large-recoil regions several of the relations are unaffected by corrections to all orders in \alpha_s. We present yet another new relation involving only observables that would verify the validity of the relations between form-factors assumed in the low-recoil region. The several relations and constraints derived will provide unambiguous signals of New Physics if it contributes to these decays. |
1704.08158 | Peter Cox | Rodrigo Alonso, Peter Cox, Chengcheng Han, Tsutomu T. Yanagida | Anomaly-free local horizontal symmetry and anomaly-full rare B-decays | 7 pages, 2 figures; v2: version published in PRD | Phys. Rev. D 96, 071701 (2017) | 10.1103/PhysRevD.96.071701 | IPMU17-0068, CERN-TH-2017-094 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The largest global symmetry that can be made local in the Standard Model +
3$\nu_R$ while being compatible with Pati-Salam unification is $SU(3)_H\times
U(1)_{B-L}$. The gauge bosons of this theory would induce flavour effects
involving both quarks and leptons, and are a potential candidate to explain the
recent reports of lepton universality violation in rare B meson decays. In this
letter we characterise this type of models and show how they can accommodate
the data and naturally be within reach of direct searches.
| [
{
"created": "Wed, 26 Apr 2017 15:14:27 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Oct 2017 04:09:39 GMT",
"version": "v2"
}
] | 2017-10-25 | [
[
"Alonso",
"Rodrigo",
""
],
[
"Cox",
"Peter",
""
],
[
"Han",
"Chengcheng",
""
],
[
"Yanagida",
"Tsutomu T.",
""
]
] | The largest global symmetry that can be made local in the Standard Model + 3$\nu_R$ while being compatible with Pati-Salam unification is $SU(3)_H\times U(1)_{B-L}$. The gauge bosons of this theory would induce flavour effects involving both quarks and leptons, and are a potential candidate to explain the recent reports of lepton universality violation in rare B meson decays. In this letter we characterise this type of models and show how they can accommodate the data and naturally be within reach of direct searches. |
1110.1451 | Riazuddin Riazuddin | Riazuddin, Sidra Shafiq | Spin-orbit splittings in heavy-light mesons and Dirac equation | 9 pages, 1 fig | null | 10.1140/epjc/s10052-012-1925-1 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The spin-orbit splitting in heavy-light mesons is seen to be suppressed
experimentally. It is shown that it can be understood qualitatively in the
frame work of Dirac theory. An alternative derivation of a relativistic
dynamical symmetry for the Dirac Hamiltonian, which suppresses spin orbit
splitting, is also given. However it is shown that such a symmetry is not
needed since the spin-orbit splitting in Dirac theory with Coulomb like
potential (as is the case for the one gluon exchange potential in pQCD) is
small anyway.
| [
{
"created": "Fri, 7 Oct 2011 08:04:35 GMT",
"version": "v1"
}
] | 2015-05-30 | [
[
"Riazuddin",
"",
""
],
[
"Shafiq",
"Sidra",
""
]
] | The spin-orbit splitting in heavy-light mesons is seen to be suppressed experimentally. It is shown that it can be understood qualitatively in the frame work of Dirac theory. An alternative derivation of a relativistic dynamical symmetry for the Dirac Hamiltonian, which suppresses spin orbit splitting, is also given. However it is shown that such a symmetry is not needed since the spin-orbit splitting in Dirac theory with Coulomb like potential (as is the case for the one gluon exchange potential in pQCD) is small anyway. |
1904.10543 | Ping-Han Chu | P.-H. Chu and Y. J. Kim and I. Savukov | Comment on "Search for an axion-induced oscillating electric dipole
moment for electrons using atomic magnetometers" | null | null | null | LA-UR-19-23854 | hep-ph nucl-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the recent work arXiv:1809.02446, the authors proposed a new method
measuring the electron oscillating electric dipole moment (eOEDM) using atomic
magnetomaters. This eOEDM is induced by the interaction between the electron
magnetic dipole moment, electric field and axion field. The result is sensitive
to the axion-photon coupling according to [Hill, PRD 91, 111702 (2015)]. Here
we want to describe that the same experimental method can be also sensitive to
the axion-electron coupling according to [Alexander and Sims, PRD 98, 015011
(2018)]. In this article, we will show the corresponding sensitivity plot and
compare with other constraints.
| [
{
"created": "Tue, 23 Apr 2019 21:35:13 GMT",
"version": "v1"
}
] | 2019-04-30 | [
[
"Chu",
"P. -H.",
""
],
[
"Kim",
"Y. J.",
""
],
[
"Savukov",
"I.",
""
]
] | In the recent work arXiv:1809.02446, the authors proposed a new method measuring the electron oscillating electric dipole moment (eOEDM) using atomic magnetomaters. This eOEDM is induced by the interaction between the electron magnetic dipole moment, electric field and axion field. The result is sensitive to the axion-photon coupling according to [Hill, PRD 91, 111702 (2015)]. Here we want to describe that the same experimental method can be also sensitive to the axion-electron coupling according to [Alexander and Sims, PRD 98, 015011 (2018)]. In this article, we will show the corresponding sensitivity plot and compare with other constraints. |
hep-ph/0505209 | Ernest Ma | Ernest Ma (UC Riverside) | Aspects of the Tetrahedral Neutrino Mass Matrix | 5 pages, no figure, important new equations added | Phys.Rev.D72:037301,2005 | 10.1103/PhysRevD.72.037301 | UCRHEP-T390 (May 2005) | hep-ph | null | The four-parameter tetrahedral neutrino mass matrix introduced earlier by the
author is studied in two specific limits, both having only two parameters and
resulting in theta_13=0, theta_23=pi/4, and tan^2 theta_12=1/2. One limit
corresponds to a recent proposal which predicts a normal ordering of neutrino
masses; the other is new and allows both inverted and normal ordering.
| [
{
"created": "Tue, 24 May 2005 19:39:28 GMT",
"version": "v1"
},
{
"created": "Wed, 25 May 2005 18:22:08 GMT",
"version": "v2"
}
] | 2010-04-06 | [
[
"Ma",
"Ernest",
"",
"UC Riverside"
]
] | The four-parameter tetrahedral neutrino mass matrix introduced earlier by the author is studied in two specific limits, both having only two parameters and resulting in theta_13=0, theta_23=pi/4, and tan^2 theta_12=1/2. One limit corresponds to a recent proposal which predicts a normal ordering of neutrino masses; the other is new and allows both inverted and normal ordering. |
2107.02302 | Lipei Du | Lipei Du (Ohio State U.), Xin An (North Carolina U.), Ulrich Heinz
(Ohio State U.) | Baryon transport and the QCD critical point | 26 pages, 17 figures; v2: Fig.14 moved to Fig.1, Sec.IIIC included
more clarifications; published on PRC | null | 10.1103/PhysRevC.104.064904 | null | hep-ph nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Fireballs created in relativistic heavy-ion collisions at different beam
energies have been argued to follow different trajectories in the QCD phase
diagram in which the QCD critical point serves as a landmark. Using a
(1+1)-dimensional model setting with transverse homogeneity, we study the
complexities introduced by the fact that the evolution history of each fireball
cannot be characterized by a single trajectory but rather covers an entire
swath of the phase diagram, with the finally emitted hadron spectra integrating
over contributions from many different trajectories. Studying the phase diagram
trajectories of fluid cells at different space-time rapidities, we explore how
baryon diffusion shuffles them around, and how they are affected by critical
dynamics near the QCD critical point. We find a striking insensitivity of
baryon diffusion to critical effects. Its origins are analyzed and possible
implications discussed.
| [
{
"created": "Mon, 5 Jul 2021 22:28:13 GMT",
"version": "v1"
},
{
"created": "Sun, 16 Jan 2022 16:46:51 GMT",
"version": "v2"
}
] | 2022-01-19 | [
[
"Du",
"Lipei",
"",
"Ohio State U."
],
[
"An",
"Xin",
"",
"North Carolina U."
],
[
"Heinz",
"Ulrich",
"",
"Ohio State U."
]
] | Fireballs created in relativistic heavy-ion collisions at different beam energies have been argued to follow different trajectories in the QCD phase diagram in which the QCD critical point serves as a landmark. Using a (1+1)-dimensional model setting with transverse homogeneity, we study the complexities introduced by the fact that the evolution history of each fireball cannot be characterized by a single trajectory but rather covers an entire swath of the phase diagram, with the finally emitted hadron spectra integrating over contributions from many different trajectories. Studying the phase diagram trajectories of fluid cells at different space-time rapidities, we explore how baryon diffusion shuffles them around, and how they are affected by critical dynamics near the QCD critical point. We find a striking insensitivity of baryon diffusion to critical effects. Its origins are analyzed and possible implications discussed. |
2209.04753 | Nestor Quintero | Cristian H. Garc\'ia-Duque, J. M. Cabarcas, J. H. Mu\~noz, N\'estor
Quintero, and Eduardo Rojas | Singlet vector leptoquark model facing recent LHCb and BABAR
measurements | 15 pages, 3 figures. V2: Typos fixed. New References added. Recent
LHCb result on the LFV decay B^0 to K^{*0} mu^{+} tau^- (mu^{-} tau^+)
included. Phenomenology analysis improved. Overall conclusions unchanged | Nuclear Physics B 988 (2023) 116115 | 10.1016/j.nuclphysb.2023.116115 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Very recently the LHCb experiment released the first measurement of the ratio
$R(\Lambda_c) = {\rm BR}(\Lambda_b \to \Lambda_c\tau\bar{\nu}_\tau)/{\rm
BR}(\Lambda_b \to \Lambda_c\mu\bar{\nu}_\mu)$. Moreover, the BABAR experiment
reported a new result of the leptonic decay ratio of Upsilon meson
$\Upsilon(3S)$, namely, $R_{\Upsilon(3S)} = {\rm BR}(\Upsilon(3S) \to
\tau^+\tau^-)/{\rm BR}(\Upsilon(3S) \to \mu^+\mu^-)$. Both measurements are
below their corresponding Standard Model predictions (deficit), deviating by
$\sim 1.1\sigma$ and $\sim 1.8\sigma$, respectively. Moreover, the LHCb
recently presented the first search of the lepton flavor violating decay $B^0
\to K^{\ast 0}\mu^\pm\tau^\mp$. Motivated by these new data, in this work we
study their impact on the phenomenology of the singlet vector leptoquark
($U_1$) model addressing the hints of lepton flavor universality violation in
the semileptonic decays of $B$ mesons ($B$ meson anomalies), by carrying out a
global fit analysis. In general, we found that a minimal version of the $U_1$
model with a mass of 1.8 TeV can successfully explain the $B$ meson anomalies,
while being compatible with all other flavor observables and LHC bounds.
Interestingly, our study shows that the new observables $R(\Lambda_c)$ and
$R_{\Upsilon(3S)}$ generate strong tension, leading to non-trivial effects on
the global fit. Future improvements at the LHCb and Belle II experiments would
help to understand their complementarity. Moreover, we also analyze the impact
of the expected sensitivity on flavor observables at Belle II to provide a
further test of the $U_1$ model. Finally, we study the minimal assumptions
under which the $U_1$ model could, in addition, provide a combined explanation
of the anomalous magnetic moment of the muon.
| [
{
"created": "Sat, 10 Sep 2022 22:22:42 GMT",
"version": "v1"
},
{
"created": "Sun, 25 Sep 2022 21:28:47 GMT",
"version": "v2"
}
] | 2023-02-21 | [
[
"García-Duque",
"Cristian H.",
""
],
[
"Cabarcas",
"J. M.",
""
],
[
"Muñoz",
"J. H.",
""
],
[
"Quintero",
"Néstor",
""
],
[
"Rojas",
"Eduardo",
""
]
] | Very recently the LHCb experiment released the first measurement of the ratio $R(\Lambda_c) = {\rm BR}(\Lambda_b \to \Lambda_c\tau\bar{\nu}_\tau)/{\rm BR}(\Lambda_b \to \Lambda_c\mu\bar{\nu}_\mu)$. Moreover, the BABAR experiment reported a new result of the leptonic decay ratio of Upsilon meson $\Upsilon(3S)$, namely, $R_{\Upsilon(3S)} = {\rm BR}(\Upsilon(3S) \to \tau^+\tau^-)/{\rm BR}(\Upsilon(3S) \to \mu^+\mu^-)$. Both measurements are below their corresponding Standard Model predictions (deficit), deviating by $\sim 1.1\sigma$ and $\sim 1.8\sigma$, respectively. Moreover, the LHCb recently presented the first search of the lepton flavor violating decay $B^0 \to K^{\ast 0}\mu^\pm\tau^\mp$. Motivated by these new data, in this work we study their impact on the phenomenology of the singlet vector leptoquark ($U_1$) model addressing the hints of lepton flavor universality violation in the semileptonic decays of $B$ mesons ($B$ meson anomalies), by carrying out a global fit analysis. In general, we found that a minimal version of the $U_1$ model with a mass of 1.8 TeV can successfully explain the $B$ meson anomalies, while being compatible with all other flavor observables and LHC bounds. Interestingly, our study shows that the new observables $R(\Lambda_c)$ and $R_{\Upsilon(3S)}$ generate strong tension, leading to non-trivial effects on the global fit. Future improvements at the LHCb and Belle II experiments would help to understand their complementarity. Moreover, we also analyze the impact of the expected sensitivity on flavor observables at Belle II to provide a further test of the $U_1$ model. Finally, we study the minimal assumptions under which the $U_1$ model could, in addition, provide a combined explanation of the anomalous magnetic moment of the muon. |
hep-ph/0211394 | Boris Kayser | Andre de Gouvea, Boris Kayser and Rabindra Mohapatra | Manifest CP Violation from Majorana Phases | 16 pages, 3 eps figures | Phys.Rev. D67 (2003) 053004 | 10.1103/PhysRevD.67.053004 | Fermilab-Pub-02/298-T, UMD-PP-03-027 | hep-ph | null | We hunt for and discuss manifestly CP-violating effects which are mediated by
Majorana phases. These phases are present if the Standard Model neutrinos are
Majorana particles. We argue that while Majorana phases do affect the strength
of neutrinoless double beta decay (a well known fact), they do so in a way that
involves no manifest violation of CP. The conditions for manifestly
CP-violating phenomena -- differences between the rates for CP-mirror-image
processes -- are presented, and three examples are discussed: (i)
neutrino-antineutrino oscillation; (ii) rare decays of K and B mesons and their
antiparticles and (iii) the lepton asymmetry generated by the decay of
hypothetical very heavy right-handed "see-saw" neutrinos. We also find that,
for the case of degenerate light neutrinos, manifestly CP-violating effects in
neutrino-antineutrino oscillation vanish, although flavor-changing transitions
do not. Finally, we comment on leptogenesis with degenerate right-handed
neutrinos, and contrast it to the neutrino-antineutrino oscillation case.
| [
{
"created": "Tue, 26 Nov 2002 20:21:32 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"de Gouvea",
"Andre",
""
],
[
"Kayser",
"Boris",
""
],
[
"Mohapatra",
"Rabindra",
""
]
] | We hunt for and discuss manifestly CP-violating effects which are mediated by Majorana phases. These phases are present if the Standard Model neutrinos are Majorana particles. We argue that while Majorana phases do affect the strength of neutrinoless double beta decay (a well known fact), they do so in a way that involves no manifest violation of CP. The conditions for manifestly CP-violating phenomena -- differences between the rates for CP-mirror-image processes -- are presented, and three examples are discussed: (i) neutrino-antineutrino oscillation; (ii) rare decays of K and B mesons and their antiparticles and (iii) the lepton asymmetry generated by the decay of hypothetical very heavy right-handed "see-saw" neutrinos. We also find that, for the case of degenerate light neutrinos, manifestly CP-violating effects in neutrino-antineutrino oscillation vanish, although flavor-changing transitions do not. Finally, we comment on leptogenesis with degenerate right-handed neutrinos, and contrast it to the neutrino-antineutrino oscillation case. |
hep-ph/0102110 | Dr. Alex Finch | A.Finch | Tests of QCD in Two Photon PHysics | Contribution to ISMD 2000, Tihany, Hungary | null | null | null | hep-ph | null | Recent developments in the field of Two Photon Physics at LEP, and their
contribution to QCD are reviewed.
| [
{
"created": "Fri, 9 Feb 2001 10:18:32 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Finch",
"A.",
""
]
] | Recent developments in the field of Two Photon Physics at LEP, and their contribution to QCD are reviewed. |
hep-ph/0409253 | Edward Shuryak | Dmitry Ostrovsky and Edward Shuryak | Instanton-induced Azimuthal Spin Asymmetry in Deep Inelastic Scattering | version 2 includes few refs and new fig.5 which contains comparison
to recent data | Phys.Rev.D71:014037,2005 | 10.1103/PhysRevD.71.014037 | null | hep-ph | null | It is by now well understood that spin asymmetry in deep inelastic scattering
(DIS) can appear if two things are both present: (i) a chirality flip of the
struck quark; (ii) a nonzero T-odd phase due to its final state interaction. So
far (i) was attributed to a new structure/wave function of the nucleon and (ii)
to some gluon exchanges. We propose a new mechanism utilizing strong vacuum
fluctuations of the gluon field described semiclasically by instantons, and
show that both (i) and (ii) are present. The magnitude of the effect is
estimated using known parameters of the instanton ensemble in the QCD vacuum
and known structure and fragmentation functions, without any new free
parameters. The result agrees in sign and (roughly) in magnitude with the
available data on single particle inclusive DIS. Furthermore, our predictions
uniquely relate effects for longitudinally and transversely polarized targets.
| [
{
"created": "Tue, 21 Sep 2004 21:26:01 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Sep 2004 14:45:24 GMT",
"version": "v2"
}
] | 2011-02-01 | [
[
"Ostrovsky",
"Dmitry",
""
],
[
"Shuryak",
"Edward",
""
]
] | It is by now well understood that spin asymmetry in deep inelastic scattering (DIS) can appear if two things are both present: (i) a chirality flip of the struck quark; (ii) a nonzero T-odd phase due to its final state interaction. So far (i) was attributed to a new structure/wave function of the nucleon and (ii) to some gluon exchanges. We propose a new mechanism utilizing strong vacuum fluctuations of the gluon field described semiclasically by instantons, and show that both (i) and (ii) are present. The magnitude of the effect is estimated using known parameters of the instanton ensemble in the QCD vacuum and known structure and fragmentation functions, without any new free parameters. The result agrees in sign and (roughly) in magnitude with the available data on single particle inclusive DIS. Furthermore, our predictions uniquely relate effects for longitudinally and transversely polarized targets. |
hep-ph/0211384 | Sven Heinemeyer | T. Hahn, S. Heinemeyer, G. Weiglein | Very Heavy MSSM Higgs-Boson Production at the Linear Collider | 6 pages, 7 figures, invited talk at the RADCOR 2002 - Loops & Legs
2002, Kloster Banz, Germany, Sept. 2002 | Nucl.Phys.Proc.Suppl. 116 (2003) 336-340 | 10.1016/S0920-5632(03)80195-0 | DCPT/02/124, IPPP/02/62, LMU 13/02, MPI-PhT/2002-72 | hep-ph | null | In the Minimal Supersymmetric Standard Model (MSSM) we present the
corrections to the heavy neutral CP-even Higgs-boson production in the
WW-fusion and Higgs-strahlung channel, e+e- -> \bar nu nu H, taking into
account all O(\alpha) corrections arising from loops of fermions and sfermions.
While the H boson shows decoupling behavior at the tree-level, we find
non-negligible loop corrections that can enhance the cross section
considerably. At a center-of-mass energy of \sqrt{s} = 1000 GeV, masses of up
to M_H <= 750 GeV are accessible at the LC in favorable regions of the MSSM
parameter space.
| [
{
"created": "Mon, 25 Nov 2002 13:41:19 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Hahn",
"T.",
""
],
[
"Heinemeyer",
"S.",
""
],
[
"Weiglein",
"G.",
""
]
] | In the Minimal Supersymmetric Standard Model (MSSM) we present the corrections to the heavy neutral CP-even Higgs-boson production in the WW-fusion and Higgs-strahlung channel, e+e- -> \bar nu nu H, taking into account all O(\alpha) corrections arising from loops of fermions and sfermions. While the H boson shows decoupling behavior at the tree-level, we find non-negligible loop corrections that can enhance the cross section considerably. At a center-of-mass energy of \sqrt{s} = 1000 GeV, masses of up to M_H <= 750 GeV are accessible at the LC in favorable regions of the MSSM parameter space. |
hep-ph/0202244 | Liliana Micu | L. Micu | A stationary relativistic representation of the bound state | 12 pages | null | null | null | hep-ph | null | We show that a bound system in momentum space can be treated like a gas of
free elementary constituents and a collective excitation of a background field
which represents the countless quantum fluctuations generating the binding
potential. The distribution function of the internal momenta in the bound
system at rest is given by the projection of the solution of a relativistic
bound state equation on the free wave functions of the elementary constituents.
The 4-momentum carried by the collective excitation is the difference between
the bound state 4-momentum and the sum of the free 4-momenta. This definiton
ensures the explicit fulfilment of Lorentz covariance, mass-shell constraints
and single particle normalizability of the bound state function. The discussion
is made for a two particle bound state and can be easily generalized to the
case of three or more particles.
| [
{
"created": "Tue, 26 Feb 2002 13:19:46 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Micu",
"L.",
""
]
] | We show that a bound system in momentum space can be treated like a gas of free elementary constituents and a collective excitation of a background field which represents the countless quantum fluctuations generating the binding potential. The distribution function of the internal momenta in the bound system at rest is given by the projection of the solution of a relativistic bound state equation on the free wave functions of the elementary constituents. The 4-momentum carried by the collective excitation is the difference between the bound state 4-momentum and the sum of the free 4-momenta. This definiton ensures the explicit fulfilment of Lorentz covariance, mass-shell constraints and single particle normalizability of the bound state function. The discussion is made for a two particle bound state and can be easily generalized to the case of three or more particles. |
hep-ph/9505335 | Hussain Faheem | F. Hussain, J.G. K\"orner, J. Landgraf and Salam Tawfiq | $SU(2N_{f})\otimes O(3)$ light diquark symmetry and current-induced
heavy baryon transition form factors | Corrected spelling mistake in title, 19 pages, latex, no figures | Z.Phys.C69:655-662,1996 | 10.1007/s002880050069 | IC/95/45, MZ-TH/95-15 | hep-ph | null | We study the current-induced bottom baryon to charm baryon transitions in the
Heavy Quark Symmetry limit as $m_{q}\rightarrow \infty$. Our discussion
involves $s$-wave to $s$-wave as well as $s$-wave to $p$-wave transitions.
Using a constituent quark model picture for the light diquark system with an
underlying $SU(2N_{f})\otimes O(3)$ symmetry and the heavy quark symmetry we
arrive at a number of new predictions for the reduced form factors that
describe these transitions.
| [
{
"created": "Thu, 18 May 1995 14:55:27 GMT",
"version": "v1"
},
{
"created": "Fri, 19 May 1995 10:14:23 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Hussain",
"F.",
""
],
[
"Körner",
"J. G.",
""
],
[
"Landgraf",
"J.",
""
],
[
"Tawfiq",
"Salam",
""
]
] | We study the current-induced bottom baryon to charm baryon transitions in the Heavy Quark Symmetry limit as $m_{q}\rightarrow \infty$. Our discussion involves $s$-wave to $s$-wave as well as $s$-wave to $p$-wave transitions. Using a constituent quark model picture for the light diquark system with an underlying $SU(2N_{f})\otimes O(3)$ symmetry and the heavy quark symmetry we arrive at a number of new predictions for the reduced form factors that describe these transitions. |
1603.07739 | Matthew Buckley | James Brooke, Matthew R. Buckley, Patrick Dunne, Bjoern Penning, John
Tamanas, and Miha Zgubic | Vector Boson Fusion Searches for Dark Matter at the LHC | 16 pages, 2 tables, 12 figures | Phys. Rev. D 93, 113013 (2016) | 10.1103/PhysRevD.93.113013 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The vector boson fusion (VBF) event topology at the Large Hadron Collider
(LHC) allows efficient suppression of dijet backgrounds and is therefore a
promising target for new physics searches. We consider dark matter models which
interact with the Standard Model through the electroweak sector: either through
new scalar and pseudoscalar mediators which can be embedded into the Higgs
sector, or via effective operators suppressed by some higher scale, and
therefore have significant VBF production cross-sections. Using realistic
simulations of the ATLAS and CMS analysis chain, including estimates of major
error sources, we project the discovery and exclusion potential of the LHC for
these models over the next decade.
| [
{
"created": "Thu, 24 Mar 2016 20:11:57 GMT",
"version": "v1"
}
] | 2016-06-29 | [
[
"Brooke",
"James",
""
],
[
"Buckley",
"Matthew R.",
""
],
[
"Dunne",
"Patrick",
""
],
[
"Penning",
"Bjoern",
""
],
[
"Tamanas",
"John",
""
],
[
"Zgubic",
"Miha",
""
]
] | The vector boson fusion (VBF) event topology at the Large Hadron Collider (LHC) allows efficient suppression of dijet backgrounds and is therefore a promising target for new physics searches. We consider dark matter models which interact with the Standard Model through the electroweak sector: either through new scalar and pseudoscalar mediators which can be embedded into the Higgs sector, or via effective operators suppressed by some higher scale, and therefore have significant VBF production cross-sections. Using realistic simulations of the ATLAS and CMS analysis chain, including estimates of major error sources, we project the discovery and exclusion potential of the LHC for these models over the next decade. |
2103.08586 | Hua-Xing Chen | Hua-Xing Chen | Hadronic molecules in B decays | 30 pages, 5 figures, 4 tables, accepted by PRD. arXiv admin note:
text overlap with arXiv:2011.07187 | Phys. Rev. D 105, 094003 (2022) | 10.1103/PhysRevD.105.094003 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | There are eighteen possibly existing $D^{(*)} \bar D^{(*)}$, $D^{(*)} \bar
K^{(*)}$, and $D^{(*)} D_s^{(*)-}$ hadronic molecular states. We construct
their corresponding interpolating currents, and calculate their masses and
decay constants using QCD sum rules. Based on these results, we calculate their
relative production rates in $B$ and $B^*$ decays through the current algebra,
and calculate their relative branching ratios through the Fierz rearrangement,
as summarized in Table III. Our results support the interpretations of the
$X(3872)$, $Z_c(3900)$, $Z_c(4020)$, and $X_0(2900)$ as the molecular states $D
\bar D^*$ of $J^{PC} = 1^{++}$, $D \bar D^*$ of $J^{PC} = 1^{+-}$, $D^* \bar
D^*$ of $J^{PC} = 1^{+-}$, and $D^* \bar K^*$ of $J^P = 0^{+}$, respectively.
Our results also suggest that the $Z_{cs}(3985)$, $Z_{cs}(4000)$, and
$Z_{cs}(4220)$ are strange partners of the $X(3872)$, $Z_c(3900)$, and
$Z_c(4020)$, respectively. In the calculations we estimate the lifetime of a
weakly-coupled composite particle $A = |BC\rangle$ to be $1/t_A \approx 1/t_B +
1/t_C + \Gamma_{A \to BC} + \cdots$, with $\cdots$ partial widths of other
possible decay channels.
| [
{
"created": "Mon, 15 Mar 2021 17:56:19 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Apr 2022 01:39:18 GMT",
"version": "v2"
}
] | 2022-05-09 | [
[
"Chen",
"Hua-Xing",
""
]
] | There are eighteen possibly existing $D^{(*)} \bar D^{(*)}$, $D^{(*)} \bar K^{(*)}$, and $D^{(*)} D_s^{(*)-}$ hadronic molecular states. We construct their corresponding interpolating currents, and calculate their masses and decay constants using QCD sum rules. Based on these results, we calculate their relative production rates in $B$ and $B^*$ decays through the current algebra, and calculate their relative branching ratios through the Fierz rearrangement, as summarized in Table III. Our results support the interpretations of the $X(3872)$, $Z_c(3900)$, $Z_c(4020)$, and $X_0(2900)$ as the molecular states $D \bar D^*$ of $J^{PC} = 1^{++}$, $D \bar D^*$ of $J^{PC} = 1^{+-}$, $D^* \bar D^*$ of $J^{PC} = 1^{+-}$, and $D^* \bar K^*$ of $J^P = 0^{+}$, respectively. Our results also suggest that the $Z_{cs}(3985)$, $Z_{cs}(4000)$, and $Z_{cs}(4220)$ are strange partners of the $X(3872)$, $Z_c(3900)$, and $Z_c(4020)$, respectively. In the calculations we estimate the lifetime of a weakly-coupled composite particle $A = |BC\rangle$ to be $1/t_A \approx 1/t_B + 1/t_C + \Gamma_{A \to BC} + \cdots$, with $\cdots$ partial widths of other possible decay channels. |
2403.15387 | Fernando Arias-Arag\'on | Fernando Arias-Arag\'on, Luc Darm\'e, Giovanni Grilli di Cortona,
Enrico Nardi | Production of dark sector particles via resonant positron annihilation
on atomic electrons | 11 pages, 3 figures | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Resonant positron annihilation on atomic electrons provides a powerful method
to search for light new particles coupled to $e^+e^-$. Reliable estimates of
production rates require a detailed characterization of electron momentum
distributions. We describe a general method that harnesses the target material
Compton profile to properly include electron velocity effects in resonant
annihilation cross-sections. We additionally find that high $Z$ atoms can
efficiently act as particle physics accelerators, providing a density of
relativistic electrons that allows to extend by several times the experimental
mass reach.
| [
{
"created": "Fri, 22 Mar 2024 17:59:43 GMT",
"version": "v1"
}
] | 2024-03-25 | [
[
"Arias-Aragón",
"Fernando",
""
],
[
"Darmé",
"Luc",
""
],
[
"di Cortona",
"Giovanni Grilli",
""
],
[
"Nardi",
"Enrico",
""
]
] | Resonant positron annihilation on atomic electrons provides a powerful method to search for light new particles coupled to $e^+e^-$. Reliable estimates of production rates require a detailed characterization of electron momentum distributions. We describe a general method that harnesses the target material Compton profile to properly include electron velocity effects in resonant annihilation cross-sections. We additionally find that high $Z$ atoms can efficiently act as particle physics accelerators, providing a density of relativistic electrons that allows to extend by several times the experimental mass reach. |
hep-ph/9211214 | Jim Pantaleone | J. Pantaleone, A. Halprin, C.N. Leung | Neutrino Mixing due to a Violation of the Equivalence Principle | 13 pages | Phys.Rev.D47:4199-4202,1993 | 10.1103/PhysRevD.47.R4199 | null | hep-ph | null | Massless neutrinos will mix if their couplings to gravity are flavor
dependent, i.e., violate the principle of equivalence. Because the
gravitational interaction grows with neutrino energy, the solar neutrino
problem and the recent atmospheric neutrino data may be simultaneously
explained by violations at the level of 1E-14 to 1E-17 or smaller. This
possibility is severely constrained by present accelerator neutrino experiments
and will be preeminently tested in proposed long baseline accelerator neutrino
experiments.
| [
{
"created": "Thu, 5 Nov 1992 21:04:50 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Pantaleone",
"J.",
""
],
[
"Halprin",
"A.",
""
],
[
"Leung",
"C. N.",
""
]
] | Massless neutrinos will mix if their couplings to gravity are flavor dependent, i.e., violate the principle of equivalence. Because the gravitational interaction grows with neutrino energy, the solar neutrino problem and the recent atmospheric neutrino data may be simultaneously explained by violations at the level of 1E-14 to 1E-17 or smaller. This possibility is severely constrained by present accelerator neutrino experiments and will be preeminently tested in proposed long baseline accelerator neutrino experiments. |
1810.04689 | Yongcheng Wu | Ning Chen, Chun Du, Yongcheng Wu, Xun-Jie Xu | Further study of the global minimum constraint on the two-Higgs-doublet
models: LHC searches for heavy Higgs bosons | 19 pages, 9 figures, 2 tables; v2: Refs added, one-loop level results
added, conclusion doesn't change, matches to published version | Phys. Rev. D 99, 035011 (2019) | 10.1103/PhysRevD.99.035011 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The usually considered vacuum of the two-Higgs-doublet model (2HDM) could be
unstable if it locates at a local but not global minimum (GM) of the scalar
potential. By requiring the vacuum to be a GM, we obtain an additional
constraint, namely the GM constraint, on the scalar potential. In this work, we
explore the GM constraint on the $CP$-conserving general 2HDM. This constraint
is found to put limits on the soft $\mathbb{Z}_2$ breaking mass parameter
$m_{12}^2$ and also squeeze the heavy $CP$-even Higgs boson mass into larger
values for the $m_{12}^2< 0$ case. Combined with the current global signal fits
from the LHC measurements of the 125 GeV Higgs boson, we discuss the
phenomenological implications for the heavy Higgs boson searches at the LHC.
| [
{
"created": "Wed, 10 Oct 2018 18:01:53 GMT",
"version": "v1"
},
{
"created": "Sun, 17 Feb 2019 14:08:07 GMT",
"version": "v2"
}
] | 2019-02-20 | [
[
"Chen",
"Ning",
""
],
[
"Du",
"Chun",
""
],
[
"Wu",
"Yongcheng",
""
],
[
"Xu",
"Xun-Jie",
""
]
] | The usually considered vacuum of the two-Higgs-doublet model (2HDM) could be unstable if it locates at a local but not global minimum (GM) of the scalar potential. By requiring the vacuum to be a GM, we obtain an additional constraint, namely the GM constraint, on the scalar potential. In this work, we explore the GM constraint on the $CP$-conserving general 2HDM. This constraint is found to put limits on the soft $\mathbb{Z}_2$ breaking mass parameter $m_{12}^2$ and also squeeze the heavy $CP$-even Higgs boson mass into larger values for the $m_{12}^2< 0$ case. Combined with the current global signal fits from the LHC measurements of the 125 GeV Higgs boson, we discuss the phenomenological implications for the heavy Higgs boson searches at the LHC. |
1206.1923 | Mikhail Mikhasenko | Mikhail Mikhasenko | A proton-pentaquark mixing and the~intrinsic charm model | 5 pages, 1 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A new interpretation of intrinsic charm phenomenon based on the assumption of
pentaquark $\left| u u d c\bar{c} \right>$ mixing with a proton is offered. The
structure function of the $c$-quark in the pentaquark is constructed. Mixing
different states is considered theoretically and using experiment data on
$D$-meson production and inclusive production of the hidden charm particles.
| [
{
"created": "Sat, 9 Jun 2012 09:36:33 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Nov 2013 11:26:39 GMT",
"version": "v2"
}
] | 2013-11-27 | [
[
"Mikhasenko",
"Mikhail",
""
]
] | A new interpretation of intrinsic charm phenomenon based on the assumption of pentaquark $\left| u u d c\bar{c} \right>$ mixing with a proton is offered. The structure function of the $c$-quark in the pentaquark is constructed. Mixing different states is considered theoretically and using experiment data on $D$-meson production and inclusive production of the hidden charm particles. |
1503.02597 | Wei Chen | Hua-Xing Chen, Er-Liang Cui, Wei Chen, T. G. Steele, Xiang Liu and
Shi-Lin Zhu | $a_1(1420)$ resonance as a tetraquark state and its isospin partner | 15 pages, 8 figures. Accepted by Phys. Rev. D | Phys. Rev. D 91, 094022 (2015) | 10.1103/PhysRevD.91.094022 | null | hep-ph hep-ex nucl-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We systematically construct tetraquark currents of $I^GJ^{PC}=1^-1^{++}$ and
classify them into types $\mathbf{A}$ (antisymmetric), $\mathbf{S}$ (symmetric)
and $\mathbf{M}$ (mixed), based on flavor symmetries of diquarks and
antidiquarks composing the tetra quark currents. We use tetraquark currents of
type $\mathbf{M}$ to perform QCD sum rule analyses, and find a tetraquark
current $\eta^M_{5\mu}$ with quark contents $q s\bar q \bar s$($q=u$ or $d$)
leading to a mass of $1.44 \pm 0.08$ GeV consistent with the $a_1(1420)$ state
recently observed by the COMPASS collaboration. Our results support tetraquark
explanations for both $a_1(1420)$ and $f_1(1420)$, assuming that they are
isospin partners. We also study their possible decay patterns. As tetraquark
candidates, the possible decay modes of $a_1(1420)$ are $S$-wave $a_1(1420)
\rightarrow K^*(892)K$ and $P$-wave $a_1(1420)\rightarrow f_0(980) \pi$ while
the possible decay patterns of $f_1(1420)$ are $S$-wave $f_1(1420) \rightarrow
K^*(892)K$ and $P$-wave $f_1(1420) \rightarrow a_0(980) \pi$. We speculate that
$a_1(1420)$ is partly responsible for the large isospin violation in the
$\eta(1405)\to f_0(980)\pi_0$ decay mode which is reported by BESIII
collaboration in the $J/\psi\to\gamma 3\pi$ process.
| [
{
"created": "Mon, 9 Mar 2015 18:14:30 GMT",
"version": "v1"
},
{
"created": "Thu, 21 May 2015 18:19:32 GMT",
"version": "v2"
}
] | 2015-05-25 | [
[
"Chen",
"Hua-Xing",
""
],
[
"Cui",
"Er-Liang",
""
],
[
"Chen",
"Wei",
""
],
[
"Steele",
"T. G.",
""
],
[
"Liu",
"Xiang",
""
],
[
"Zhu",
"Shi-Lin",
""
]
] | We systematically construct tetraquark currents of $I^GJ^{PC}=1^-1^{++}$ and classify them into types $\mathbf{A}$ (antisymmetric), $\mathbf{S}$ (symmetric) and $\mathbf{M}$ (mixed), based on flavor symmetries of diquarks and antidiquarks composing the tetra quark currents. We use tetraquark currents of type $\mathbf{M}$ to perform QCD sum rule analyses, and find a tetraquark current $\eta^M_{5\mu}$ with quark contents $q s\bar q \bar s$($q=u$ or $d$) leading to a mass of $1.44 \pm 0.08$ GeV consistent with the $a_1(1420)$ state recently observed by the COMPASS collaboration. Our results support tetraquark explanations for both $a_1(1420)$ and $f_1(1420)$, assuming that they are isospin partners. We also study their possible decay patterns. As tetraquark candidates, the possible decay modes of $a_1(1420)$ are $S$-wave $a_1(1420) \rightarrow K^*(892)K$ and $P$-wave $a_1(1420)\rightarrow f_0(980) \pi$ while the possible decay patterns of $f_1(1420)$ are $S$-wave $f_1(1420) \rightarrow K^*(892)K$ and $P$-wave $f_1(1420) \rightarrow a_0(980) \pi$. We speculate that $a_1(1420)$ is partly responsible for the large isospin violation in the $\eta(1405)\to f_0(980)\pi_0$ decay mode which is reported by BESIII collaboration in the $J/\psi\to\gamma 3\pi$ process. |
2304.07682 | Xiao-Yun Wang | Xiao-Yun Wang, Chen Dong, Xiang Liu | Analysis of strong coupling constant with machine learning and its
application | 10 pages, 7 figures | Chin.Phys.Lett. 41 (2023) 031201 | 10.1088/0256-307X/41/3/031201 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | In this work, we investigate the nature of the strong coupling constant and
related physics. Through the analysis of accumulated experimental data from
around the world, we employ the ability of machine learning to unravel its
physical laws. The result of our efforts is a formula that captures the
expansive panorama of the distribution of the strong coupling constant across
the entire energy range. Importantly, this newly derived expression is very
similar to the formula derived from the Dyson-Schwinger equations based on the
framework of Yang-Mills theory. By introducing the Euler number, $e$, into the
functional formula of the strong coupling constant at high energies, we have
successfully solved the puzzle of the infrared divergence, which allows for a
seamless transition of the strong coupling constant from the perturbative to
the non-perturbative energy regime. Moreover, the obtained ghost and gluon
dressing function distribution results confirm that the obtained strong
coupling constant formula can well describe the physical properties of the
non-perturbed regime. In addition, we investigate the QCD strong coupling
constant result of the Bjorken sum rule $\Gamma_1^{p-n}$ and the quark-quark
static energy $E_0(r)$, and find that the global energy scale can effectively
interpret the experimental data. The results presented in this work shed light
on the puzzling properties of quantum chromodynamics and the intricate
interplay of strong coupling constants at both low and high energy scales.
| [
{
"created": "Sun, 16 Apr 2023 03:23:33 GMT",
"version": "v1"
},
{
"created": "Sun, 28 May 2023 03:41:55 GMT",
"version": "v2"
},
{
"created": "Fri, 6 Oct 2023 05:59:57 GMT",
"version": "v3"
},
{
"created": "Thu, 29 Feb 2024 02:06:29 GMT",
"version": "v4"
}
] | 2024-03-06 | [
[
"Wang",
"Xiao-Yun",
""
],
[
"Dong",
"Chen",
""
],
[
"Liu",
"Xiang",
""
]
] | In this work, we investigate the nature of the strong coupling constant and related physics. Through the analysis of accumulated experimental data from around the world, we employ the ability of machine learning to unravel its physical laws. The result of our efforts is a formula that captures the expansive panorama of the distribution of the strong coupling constant across the entire energy range. Importantly, this newly derived expression is very similar to the formula derived from the Dyson-Schwinger equations based on the framework of Yang-Mills theory. By introducing the Euler number, $e$, into the functional formula of the strong coupling constant at high energies, we have successfully solved the puzzle of the infrared divergence, which allows for a seamless transition of the strong coupling constant from the perturbative to the non-perturbative energy regime. Moreover, the obtained ghost and gluon dressing function distribution results confirm that the obtained strong coupling constant formula can well describe the physical properties of the non-perturbed regime. In addition, we investigate the QCD strong coupling constant result of the Bjorken sum rule $\Gamma_1^{p-n}$ and the quark-quark static energy $E_0(r)$, and find that the global energy scale can effectively interpret the experimental data. The results presented in this work shed light on the puzzling properties of quantum chromodynamics and the intricate interplay of strong coupling constants at both low and high energy scales. |
hep-ph/0009050 | Lev Leinson | L. B. Leinson | Neutrino emission due to Cooper pairing of protons in cooling neutron
stars: Collective effects | 11 pages, 2 figures | Phys.Lett. B473 (2000) 318 | 10.1016/S0370-2693(99)01473-2 | null | hep-ph | null | The process of neutrino-pair radiation due to formation and breaking of
Cooper pairs of protons in superconducting cores of neutron stars is considered
with taking into account of the electromagnetic coupling of protons to ambient
electrons. It is shown that plasma polarization strongly modifies the effective
vector weak current of protons. Collective response of ambient electrons to the
proton quantum transition contributes coherently to the complete interaction
with the neutrino field and enhances the rate of neutrino-pair production by
two orders of magnitude.
| [
{
"created": "Tue, 5 Sep 2000 10:22:29 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Sep 2000 08:08:52 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Leinson",
"L. B.",
""
]
] | The process of neutrino-pair radiation due to formation and breaking of Cooper pairs of protons in superconducting cores of neutron stars is considered with taking into account of the electromagnetic coupling of protons to ambient electrons. It is shown that plasma polarization strongly modifies the effective vector weak current of protons. Collective response of ambient electrons to the proton quantum transition contributes coherently to the complete interaction with the neutrino field and enhances the rate of neutrino-pair production by two orders of magnitude. |
1707.02517 | Zhou Rui | Zhou Rui, Ya Li, and Zhen-Jun Xiao | Branching ratios, $CP$ asymmetries and polarizations of $B\rightarrow
\psi(2S) V$ decays | 14 pages, 1 figure, 6 tables | Eur. Phys. J. C (2017) 77:610 | 10.1140/epjc/s10052-017-5193-y | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyzed the nonleptonic decays $B/B_s\to \psi(2S) V $ with $V=(\rho,
\omega, K^{*}, \phi)$ by employing the perturbative QCD (PQCD) factorization
approach. Here the branching ratios, the $CP$ asymmetries and the complete set
of polarization observables are investigated systematically. Besides the
traditional contributions from the factorizable and nonfactorizable diagrams at
the leading order, the next-to-leading order (NLO) vertex corrections could
also provide considerable contributions. The PQCD predictions for the branching
ratios of the $B_{(s)}\to \psi(2S)K^{*}, \psi(2S) \phi$ decays are consistent
with the measured values within errors. As for $B\to \psi(2S) \rho, \psi(2S)
\omega$ decays, the branching ratios can reach the order of $10^{-5}$ and could
be measured in the LHCb and Belle-II experiments. The numerical results show
that the direct $CP$ asymmetries of the considered decays are very small. Thus
the observation of any large direct $CP$ asymmetry for these decays will be a
signal for new physics. The mixing induced $CP$ asymmetries in the neutral
modes are very close to $\sin 2\beta_{(s)}$, which suggests that these channels
can give a cross-check on the measurement of the Cabbibo-Kobayashi-Maskawa
(CKM) angle $\beta$ and $\beta_s$. We found that the longitudinal polarization
fractions $f_0$ are suppressed to $\sim 50\%$ due to the large nonfactorizable
contributions. The magnitudes and phases of the two transverse amplitudes
$\mathcal {A}_{\parallel}$ and $\mathcal {A}_{\perp}$ are roughly equal, which
is an indication for the approximate light quark helicity conservation in these
decays. The overall polarization observables of $B\to \psi(2S) K^{*0}$ and
$B_s\to \psi(2S) \phi$ channels are also in good agreement with the
experimental measurements as reported by LHCb and BaBar. Other results can also
be tested by the LHCb and Belle-II experiments.
| [
{
"created": "Sun, 9 Jul 2017 02:09:16 GMT",
"version": "v1"
}
] | 2017-09-18 | [
[
"Rui",
"Zhou",
""
],
[
"Li",
"Ya",
""
],
[
"Xiao",
"Zhen-Jun",
""
]
] | We analyzed the nonleptonic decays $B/B_s\to \psi(2S) V $ with $V=(\rho, \omega, K^{*}, \phi)$ by employing the perturbative QCD (PQCD) factorization approach. Here the branching ratios, the $CP$ asymmetries and the complete set of polarization observables are investigated systematically. Besides the traditional contributions from the factorizable and nonfactorizable diagrams at the leading order, the next-to-leading order (NLO) vertex corrections could also provide considerable contributions. The PQCD predictions for the branching ratios of the $B_{(s)}\to \psi(2S)K^{*}, \psi(2S) \phi$ decays are consistent with the measured values within errors. As for $B\to \psi(2S) \rho, \psi(2S) \omega$ decays, the branching ratios can reach the order of $10^{-5}$ and could be measured in the LHCb and Belle-II experiments. The numerical results show that the direct $CP$ asymmetries of the considered decays are very small. Thus the observation of any large direct $CP$ asymmetry for these decays will be a signal for new physics. The mixing induced $CP$ asymmetries in the neutral modes are very close to $\sin 2\beta_{(s)}$, which suggests that these channels can give a cross-check on the measurement of the Cabbibo-Kobayashi-Maskawa (CKM) angle $\beta$ and $\beta_s$. We found that the longitudinal polarization fractions $f_0$ are suppressed to $\sim 50\%$ due to the large nonfactorizable contributions. The magnitudes and phases of the two transverse amplitudes $\mathcal {A}_{\parallel}$ and $\mathcal {A}_{\perp}$ are roughly equal, which is an indication for the approximate light quark helicity conservation in these decays. The overall polarization observables of $B\to \psi(2S) K^{*0}$ and $B_s\to \psi(2S) \phi$ channels are also in good agreement with the experimental measurements as reported by LHCb and BaBar. Other results can also be tested by the LHCb and Belle-II experiments. |
0911.1942 | Riccardo Torre | Riccardo Barbieri, Antonio E. Carcamo, Gennaro Corcella, Riccardo
Torre, Enrico Trincherini | Composite Vectors at the Large Hadron Collider | 17 pages, 4 figures, 2 tables | JHEP 1003:068,2010 | 10.1007/JHEP03(2010)068 | IFUP-TH/2009-24 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An unspecified strong dynamics may give rise to composite vectors
sufficiently light that their interactions, among themselves or with the
electroweak gauge bosons, be approximately described by an effective Lagrangian
invariant under $SU(2)_L\times SU(2)_R/ SU(2)_{L+R}$. We study the production
at the LHC of two such states by vector boson fusion or by the Drell--Yan
process in this general framework and we compare it with the case of gauge
vectors from a $SU(2)_L\times SU(2)_R\times SU(2)^N$ gauge model spontaneously
broken to the diagonal SU(2) subgroup by a generic $\sigma$-model. Special
attention is payed to the asymptotic behaviour of the different amplitudes in
both cases. The expected rates of multi-lepton events from the decay of the
composite vectors are also given. A thorough phenomenological analysis and the
evaluation of the backgrounds to such signals, aiming at assessing the
visibility of composite-vector pairs at the LHC, is instead deferred to future
work.
| [
{
"created": "Tue, 10 Nov 2009 16:36:29 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Mar 2010 18:01:36 GMT",
"version": "v2"
},
{
"created": "Wed, 31 Mar 2010 12:20:16 GMT",
"version": "v3"
}
] | 2015-03-13 | [
[
"Barbieri",
"Riccardo",
""
],
[
"Carcamo",
"Antonio E.",
""
],
[
"Corcella",
"Gennaro",
""
],
[
"Torre",
"Riccardo",
""
],
[
"Trincherini",
"Enrico",
""
]
] | An unspecified strong dynamics may give rise to composite vectors sufficiently light that their interactions, among themselves or with the electroweak gauge bosons, be approximately described by an effective Lagrangian invariant under $SU(2)_L\times SU(2)_R/ SU(2)_{L+R}$. We study the production at the LHC of two such states by vector boson fusion or by the Drell--Yan process in this general framework and we compare it with the case of gauge vectors from a $SU(2)_L\times SU(2)_R\times SU(2)^N$ gauge model spontaneously broken to the diagonal SU(2) subgroup by a generic $\sigma$-model. Special attention is payed to the asymptotic behaviour of the different amplitudes in both cases. The expected rates of multi-lepton events from the decay of the composite vectors are also given. A thorough phenomenological analysis and the evaluation of the backgrounds to such signals, aiming at assessing the visibility of composite-vector pairs at the LHC, is instead deferred to future work. |
1901.03256 | Renato Zamora | M. Loewe, L. Monje, E. Mu\~noz, A. Raya and R. Zamora | A new perspective for the magnetic corrections to $\pi$-$\pi$ Scattering
Lengths in the Linear Sigma Model | 7 pages, 3 figures | Phys. Rev. D 99, 056002 (2019) | 10.1103/PhysRevD.99.056002 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article, a new perspective for obtaining the magnetic evolution of
$\pi-\pi $ scattering lengths in the frame of the linear sigma model is
presented. When computing the relevant one-loop diagrams that contribute to
these parameters, the sum over Landau levels --emerging from the expansion of
the Schwinger propagator-- is handled in a novel way that could also be applied
to the calculation of other magnetic-type corrections. Essentially, we have
obtained an expansion in terms of Hurwitz Zeta functions. It is necessary to
regularize our expressions by an appropriate physical subtraction when $|qB|
\rightarrow 0$ ($q$ the meson charge and $B$ the magnetic field strength). In
this way, we are able to interpolate between the very high magnetic field
strength region, usually handled in terms of the Lowest Landau Level (LLA)
approximation, and the weak field region, discussed in a previous paper by some
of us, which is based on an appropriate expansion of the Schwinger propagator
up to order $|qB|^{2}$. Our results for the scattering lengths parameters
produce a soft evolution in a wide region of magnetic field strengths, reducing
to the previously found expressions in both limits.
| [
{
"created": "Thu, 10 Jan 2019 16:34:14 GMT",
"version": "v1"
}
] | 2019-03-13 | [
[
"Loewe",
"M.",
""
],
[
"Monje",
"L.",
""
],
[
"Muñoz",
"E.",
""
],
[
"Raya",
"A.",
""
],
[
"Zamora",
"R.",
""
]
] | In this article, a new perspective for obtaining the magnetic evolution of $\pi-\pi $ scattering lengths in the frame of the linear sigma model is presented. When computing the relevant one-loop diagrams that contribute to these parameters, the sum over Landau levels --emerging from the expansion of the Schwinger propagator-- is handled in a novel way that could also be applied to the calculation of other magnetic-type corrections. Essentially, we have obtained an expansion in terms of Hurwitz Zeta functions. It is necessary to regularize our expressions by an appropriate physical subtraction when $|qB| \rightarrow 0$ ($q$ the meson charge and $B$ the magnetic field strength). In this way, we are able to interpolate between the very high magnetic field strength region, usually handled in terms of the Lowest Landau Level (LLA) approximation, and the weak field region, discussed in a previous paper by some of us, which is based on an appropriate expansion of the Schwinger propagator up to order $|qB|^{2}$. Our results for the scattering lengths parameters produce a soft evolution in a wide region of magnetic field strengths, reducing to the previously found expressions in both limits. |
hep-ph/9705470 | Wojciech Florkowski | A. Bialas, W. Czyz, W. Florkowski | Total $\gamma^{\star}\gamma^{\star}$ cross section and the BFKL pomeron | 16 pages, latex, uses psfig, 2 figures | Eur.Phys.J.C2:683-689,1998 | 10.1007/s100520050171 | TPJU - 6/97 | hep-ph | null | In the framework of the dipole picture of the BFKL pomeron we discuss a few
possibilities of calculating the total $\gamma^{\star}\gamma^{\star}$ cross
section of the virtual photons. We argue that the existing successful fits of
the dipole picture formulae to the measured structure functions $F_2(Q^2,x)$
favor one of the possible extensions of the dipole picture of the BFKL pomeron
formulated recently by one of us.
| [
{
"created": "Fri, 30 May 1997 08:10:49 GMT",
"version": "v1"
}
] | 2011-09-13 | [
[
"Bialas",
"A.",
""
],
[
"Czyz",
"W.",
""
],
[
"Florkowski",
"W.",
""
]
] | In the framework of the dipole picture of the BFKL pomeron we discuss a few possibilities of calculating the total $\gamma^{\star}\gamma^{\star}$ cross section of the virtual photons. We argue that the existing successful fits of the dipole picture formulae to the measured structure functions $F_2(Q^2,x)$ favor one of the possible extensions of the dipole picture of the BFKL pomeron formulated recently by one of us. |
hep-ph/9301274 | Claudio Coriano | Claudio Coriano', Anatoly Radyushkin and George Sterman | QCD Sum Rules and Compton Scattering | 30 pages in Latex, 6 figures not included, available upon request
(send email to: claudio@max.physics.sunysb.edu), ITP-SB-92-70, CEBAF-TH-92-32 | Nucl.Phys.B405:481-506,1993 | 10.1016/0550-3213(93)90556-5 | null | hep-ph | null | We extend QCD sum rule analysis to moderate energy fixed angle Compton
scattering. In this kinematic region there is a strong similarity to the sum
rule treatment of electromagnetic form factors, although the four-point
amplitude requires a modification of the Borel transform. To illustrate our
method, we derive the sum rules for helicity amplitudes in pion Compton
scattering and estimate their large-$t$ behavior in the local duality
approximation.
| [
{
"created": "Tue, 26 Jan 1993 15:48:11 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Coriano'",
"Claudio",
""
],
[
"Radyushkin",
"Anatoly",
""
],
[
"Sterman",
"George",
""
]
] | We extend QCD sum rule analysis to moderate energy fixed angle Compton scattering. In this kinematic region there is a strong similarity to the sum rule treatment of electromagnetic form factors, although the four-point amplitude requires a modification of the Borel transform. To illustrate our method, we derive the sum rules for helicity amplitudes in pion Compton scattering and estimate their large-$t$ behavior in the local duality approximation. |
1410.5274 | Zhenjun Xiao | Zhen-Jun Xiao, Ya Li, Dong-Ting Lin, Ying-Ying Fan and Ai-Jun Ma | $\bar{B}^0_s \to (\pi^0 \eta^{(*)}, \eta^{(*)}\eta^{(*)})$ decays and
the effects of next-to-leading order contributions in the perturbative QCD
approach | 12 pages, 2figures and 3 tables | Phys. Rev. D 90, 114028 (2014) | 10.1103/PhysRevD.90.114028 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we calculate the branching ratios and CP violating asymmetries
of the five $\bar{B}^0_s \to (\pi^0\eta^{(*)},\eta^{(*)}\eta^{(*)})$ decays, by
employing the perturbative QCD (pQCD) factorization approach and with the
inclusion of all currently known next-to-leading order (NLO) contributions. We
find that (a) the NLO contributions can provide about 100% enhancements to the
LO pQCD predictions for the decay rates of $\bar{B}_s^0 \to \eta\eta^\prime$
and $\eta^\prime \eta^\prime$ decays, but result in small changes to
$Br(\bar{B}_s \to \pi^0 \eta^{(*)})$ and $Br(\bar{B}_s \to \eta\eta)$; (b) the
newly known NLO twist-2 and twist-3 contributions to the relevant form factors
can provide about 10% enhancements to the decay rates of the considered decays;
(c) for $\bar{B}_s \to \pi^0 \eta^{(*)}$ decays, their direct CP-violating
asymmetries $\cala_f^{dir}$ could be enhanced significantly by the inclusion of
the NLO contributions; and (d) the pQCD predictions for $Br(\bar{B}_s \to \eta
\eta^{(*)})$ and $Br(\bar{B}_s \to \eta^\prime \eta^\prime)$ can be as large as
$4\times 10^{-5}$, which may be measurable at LHCb or the forthcoming super-B
experiments.
| [
{
"created": "Mon, 20 Oct 2014 13:44:57 GMT",
"version": "v1"
}
] | 2014-12-31 | [
[
"Xiao",
"Zhen-Jun",
""
],
[
"Li",
"Ya",
""
],
[
"Lin",
"Dong-Ting",
""
],
[
"Fan",
"Ying-Ying",
""
],
[
"Ma",
"Ai-Jun",
""
]
] | In this paper, we calculate the branching ratios and CP violating asymmetries of the five $\bar{B}^0_s \to (\pi^0\eta^{(*)},\eta^{(*)}\eta^{(*)})$ decays, by employing the perturbative QCD (pQCD) factorization approach and with the inclusion of all currently known next-to-leading order (NLO) contributions. We find that (a) the NLO contributions can provide about 100% enhancements to the LO pQCD predictions for the decay rates of $\bar{B}_s^0 \to \eta\eta^\prime$ and $\eta^\prime \eta^\prime$ decays, but result in small changes to $Br(\bar{B}_s \to \pi^0 \eta^{(*)})$ and $Br(\bar{B}_s \to \eta\eta)$; (b) the newly known NLO twist-2 and twist-3 contributions to the relevant form factors can provide about 10% enhancements to the decay rates of the considered decays; (c) for $\bar{B}_s \to \pi^0 \eta^{(*)}$ decays, their direct CP-violating asymmetries $\cala_f^{dir}$ could be enhanced significantly by the inclusion of the NLO contributions; and (d) the pQCD predictions for $Br(\bar{B}_s \to \eta \eta^{(*)})$ and $Br(\bar{B}_s \to \eta^\prime \eta^\prime)$ can be as large as $4\times 10^{-5}$, which may be measurable at LHCb or the forthcoming super-B experiments. |
hep-ph/9811451 | Takehiko Asaka | T. Asaka and Masahiro Yamaguchi | Hadronic Axion Model in Gauge-Mediated Supersymmetry Breaking and
Cosmology of Saxion | 24 pages, 3 figures | Phys.Rev. D59 (1999) 125003 | 10.1103/PhysRevD.59.125003 | null | hep-ph | null | Recently we have proposed a simple hadronic axion model within gauge-mediated
supersymmetry breaking. In this paper we discuss various cosmological
consequences of the model in great detail. A particular attention is paid to a
saxion, a scalar partner of an axion, which is produced as a coherent
oscillation in the early universe. We show that our model is cosmologically
viable, if the reheating temperature of inflation is sufficiently low. We also
discuss the late decay of the saxion which gives a preferable power spectrum of
the density fluctuation in the standard cold dark matter model when compared
with the observation.
| [
{
"created": "Tue, 24 Nov 1998 08:50:08 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Asaka",
"T.",
""
],
[
"Yamaguchi",
"Masahiro",
""
]
] | Recently we have proposed a simple hadronic axion model within gauge-mediated supersymmetry breaking. In this paper we discuss various cosmological consequences of the model in great detail. A particular attention is paid to a saxion, a scalar partner of an axion, which is produced as a coherent oscillation in the early universe. We show that our model is cosmologically viable, if the reheating temperature of inflation is sufficiently low. We also discuss the late decay of the saxion which gives a preferable power spectrum of the density fluctuation in the standard cold dark matter model when compared with the observation. |
hep-ph/9607450 | Thomas | Savas Dimopoulos, Michael Dine, Stuart Raby, Scott Thomas, James D.
Wells | Phenomenological Implications of Low Energy Supersymmetry Breaking | 5 pages, Latex, requires espcrc2.sty, to appear in the proceedings of
SUSY96 | Nucl.Phys.Proc.Suppl. 52A (1997) 38-42 | 10.1016/S0920-5632(96)00530-0 | SLAC-PUB-7236 | hep-ph hep-ex | null | The experimental signatures for low energy supersymmetry breaking are
presented. The lightest standard model superpartner is unstable and decays to
its partner plus a Goldstino, $G$. For a supersymmetry breaking scale below a
few 1000 TeV this decay can take place within a detector, leading to very
distinctive signatures. If a neutralino is the lightest standard model
superpartner it decays by $\chi_1^0 \to \gamma + G$, and if kinematically
accessible by $\chi_1^0 \to (Z^0, h^0, H^0, A^0) + G$. These decays can give
rise to displaced vertices. Alternately, if a slepton is the lightest standard
model superpartner it decays by $\tilde{l} \to l + G$. This can be seen as a
greater than minimum ionizing charged particle track, possibly with a kink to a
minimum ionizing track.
| [
{
"created": "Sat, 27 Jul 1996 18:45:42 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Dimopoulos",
"Savas",
""
],
[
"Dine",
"Michael",
""
],
[
"Raby",
"Stuart",
""
],
[
"Thomas",
"Scott",
""
],
[
"Wells",
"James D.",
""
]
] | The experimental signatures for low energy supersymmetry breaking are presented. The lightest standard model superpartner is unstable and decays to its partner plus a Goldstino, $G$. For a supersymmetry breaking scale below a few 1000 TeV this decay can take place within a detector, leading to very distinctive signatures. If a neutralino is the lightest standard model superpartner it decays by $\chi_1^0 \to \gamma + G$, and if kinematically accessible by $\chi_1^0 \to (Z^0, h^0, H^0, A^0) + G$. These decays can give rise to displaced vertices. Alternately, if a slepton is the lightest standard model superpartner it decays by $\tilde{l} \to l + G$. This can be seen as a greater than minimum ionizing charged particle track, possibly with a kink to a minimum ionizing track. |
hep-ph/0405291 | Roberto Sghedoni | Roberto Sghedoni | Transverse Momentum Distribution in B Decays | Ph.D. Thesis, 141pp | null | null | null | hep-ph | null | We derive the strange quark transverse momentum distribution for the $% b\to
s\gamma $ decay. A resummed formula is presented showing the singularity
structure in the impact parameter $b$. We observe the appearance of a new
next-to-leading soft singularity. The first term of the coefficient function is
calculated to complete the evaluation of the distribution with next-to-leading
accuracy and the constant term. The connection with the shape function for the
mass spectrum is briefly discussed. The extension of the shape function
interpretation to the transverse momentum distribution seems not to be longer
possible. The complete perturbative $O(\alpha)$ transverse momentum
distribution formula for the $b \to s \gamma$ process is given. The coefficient
function, the double and single logarithmic terms together with the remainder
function are explicitely evaluated and presented in analytic form. A resummed
expression is also shown.
| [
{
"created": "Fri, 28 May 2004 21:17:46 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Sghedoni",
"Roberto",
""
]
] | We derive the strange quark transverse momentum distribution for the $% b\to s\gamma $ decay. A resummed formula is presented showing the singularity structure in the impact parameter $b$. We observe the appearance of a new next-to-leading soft singularity. The first term of the coefficient function is calculated to complete the evaluation of the distribution with next-to-leading accuracy and the constant term. The connection with the shape function for the mass spectrum is briefly discussed. The extension of the shape function interpretation to the transverse momentum distribution seems not to be longer possible. The complete perturbative $O(\alpha)$ transverse momentum distribution formula for the $b \to s \gamma$ process is given. The coefficient function, the double and single logarithmic terms together with the remainder function are explicitely evaluated and presented in analytic form. A resummed expression is also shown. |
hep-ph/9301257 | Slava Belyaev | V.M.Belyaev | Delta-Isobar Magnetic Form Factor in QCD | 13 pages, CEBAF-TH-93-02, Latex, 1 Figure | null | null | null | hep-ph | null | We consider the QCD sum rules approach for Delta-isobar magnetic form factor
in the infra-red region $0<Q^2<1GeV^2$. The QCD sum rules in external variable
field are used. The obtained formfactor is in agreement with quark model
predictions for the Delta-isobar magnetic moment.
| [
{
"created": "Thu, 21 Jan 1993 16:59:46 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Belyaev",
"V. M.",
""
]
] | We consider the QCD sum rules approach for Delta-isobar magnetic form factor in the infra-red region $0<Q^2<1GeV^2$. The QCD sum rules in external variable field are used. The obtained formfactor is in agreement with quark model predictions for the Delta-isobar magnetic moment. |
1207.2199 | Christian Sturm | P. A. Baikov, K. G. Chetyrkin, J. H. Kuhn, C. Sturm | The relation between the QED charge renormalized in MSbar and on-shell
schemes at four loops, the QED on-shell beta-function at five loops and
asymptotic contributions to the muon anomaly at five and six loops | 25 pages, 6 figures; v2: final published version | Nucl.Phys.B 867 (2013) 182-202 | 10.1016/j.nuclphysb.2012.09.018 | MPP-2012-105; SFB/CPP-12-40; TTP12--12-021 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we compute the four-loop corrections to the QED photon
self-energy Pi(Q^2) in the two limits of q=0 and Q^2->infinity. These results
are used to explicitly construct the conversion relations between the QED
charge renormalized in on-shell(OS) and MSbar scheme. Using these relations and
results of Baikov et al. [1] we construct the momentum dependent part of
Pi(Q^2,m,alpha) at large Q^2 at five loops in both MSbar and OS schemes. As a
direct consequence we arrive at the full result for the QED beta-function in
the OS scheme at five loops. These results are applied, in turn, to
analytically evaluate a class of asymptotic contributions to the muon anomaly
at five and six loops.
| [
{
"created": "Tue, 10 Jul 2012 00:15:40 GMT",
"version": "v1"
},
{
"created": "Fri, 9 Nov 2012 22:28:35 GMT",
"version": "v2"
}
] | 2012-11-13 | [
[
"Baikov",
"P. A.",
""
],
[
"Chetyrkin",
"K. G.",
""
],
[
"Kuhn",
"J. H.",
""
],
[
"Sturm",
"C.",
""
]
] | In this paper we compute the four-loop corrections to the QED photon self-energy Pi(Q^2) in the two limits of q=0 and Q^2->infinity. These results are used to explicitly construct the conversion relations between the QED charge renormalized in on-shell(OS) and MSbar scheme. Using these relations and results of Baikov et al. [1] we construct the momentum dependent part of Pi(Q^2,m,alpha) at large Q^2 at five loops in both MSbar and OS schemes. As a direct consequence we arrive at the full result for the QED beta-function in the OS scheme at five loops. These results are applied, in turn, to analytically evaluate a class of asymptotic contributions to the muon anomaly at five and six loops. |
hep-ph/0312043 | Peschanski | R. B. Peschanski | Beyond BFKL | 12 pages, 6 figures, Invited Talk at the Ringberg Workshop ``New
Trends in HERA Physics 2003''September 28 - October 3, 2003 | null | 10.1142/9789812702722_0022 | Publication SPhT-T03/188 (Saclay) | hep-ph | null | The Balitsky-Fadin-Kuraev-Lipatov (BFKL) evolution equation is known to be
``unstable'' with respect to fluctuations in gluon virtuality, transverse
momentum and energy requiring to go beyond the leading order BFKL. Still, these
instabilities point to fruitful improvements of our deep understanding of QCD.
Recent applications to next-leading order and to saturation problems are
outlined.
| [
{
"created": "Wed, 3 Dec 2003 09:28:34 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Peschanski",
"R. B.",
""
]
] | The Balitsky-Fadin-Kuraev-Lipatov (BFKL) evolution equation is known to be ``unstable'' with respect to fluctuations in gluon virtuality, transverse momentum and energy requiring to go beyond the leading order BFKL. Still, these instabilities point to fruitful improvements of our deep understanding of QCD. Recent applications to next-leading order and to saturation problems are outlined. |
1004.5250 | David Ireland | D. G. Ireland | Information Content of Polarization Measurements | 19 pages, 4 figures; figures updated, minor textual corrections | Phys.Rev.C82:025204,2010 | 10.1103/PhysRevC.82.025204 | null | hep-ph hep-ex physics.data-an | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Information entropy is applied to the state of knowledge of reaction
amplitudes in pseudoscalar meson photoproduction, and a scheme is developed
that quantifies the information content of a measured set of polarization
observables. It is shown that this definition of information is a more
practical measure of the quality of a set of measured observables than whether
the combination is a mathematically complete set. It is also shown that when
experimental uncertainty is introduced, complete sets of measurements do not
necessarily remove ambiguities, and that experiments should strive to measure
as many observables as practical in order to extract amplitudes.
| [
{
"created": "Thu, 29 Apr 2010 11:23:38 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Jul 2010 10:46:46 GMT",
"version": "v2"
}
] | 2010-09-02 | [
[
"Ireland",
"D. G.",
""
]
] | Information entropy is applied to the state of knowledge of reaction amplitudes in pseudoscalar meson photoproduction, and a scheme is developed that quantifies the information content of a measured set of polarization observables. It is shown that this definition of information is a more practical measure of the quality of a set of measured observables than whether the combination is a mathematically complete set. It is also shown that when experimental uncertainty is introduced, complete sets of measurements do not necessarily remove ambiguities, and that experiments should strive to measure as many observables as practical in order to extract amplitudes. |
1108.1391 | James Cline | James M. Cline, Andrew R. Frey | Minimal hidden sector models for CoGeNT/DAMA events | 15 pages, 1 figure; v4: published version; added references on PAMELA
constraint and discussion of gauge boson mixing; v3: clarified role of
inelastic couplings, added discussion of astrophysical constraints, added
references; v2: added references and corrected analysis of exothermic dark
matter | null | 10.1103/PhysRevD.84.075003 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Motivated by recent attempts to reconcile hints of direct dark matter
detection by the CoGeNT and DAMA experiments, we construct simple particle
physics models that can accommodate the constraints. We point out challenges
for building reasonable models and identify the most promising scenarios for
getting isospin violation and inelasticity, as indicated by some
phenomenological studies. If inelastic scattering is demanded, we need two new
light gauge bosons, one of which kinetically mixes with the standard model
hypercharge and has mass < 2 GeV, and another which couples to baryon number
and has mass 6.8 +/- 0.2 GeV. Their interference gives the desired amount of
isospin violation. The dark matter is nearly Dirac, but with small Majorana
masses induced by spontaneous symmetry breaking, so that the gauge boson
couplings become exactly off-diagonal in the mass basis, and the small mass
splitting needed for inelasticity is simultaneously produced. If only elastic
scattering is demanded, then an alternative model, with interference between
the kinetically mixed gauge boson and a hidden sector scalar Higgs, is adequate
to give the required isospin violation. In both cases, the light kinetically
mixed gauge boson is in the range of interest for currently running fixed
target experiments.
| [
{
"created": "Fri, 5 Aug 2011 19:59:56 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Aug 2011 15:58:40 GMT",
"version": "v2"
},
{
"created": "Sat, 3 Sep 2011 03:12:33 GMT",
"version": "v3"
},
{
"created": "Mon, 19 Sep 2011 16:03:42 GMT",
"version": "v4"
}
] | 2013-05-29 | [
[
"Cline",
"James M.",
""
],
[
"Frey",
"Andrew R.",
""
]
] | Motivated by recent attempts to reconcile hints of direct dark matter detection by the CoGeNT and DAMA experiments, we construct simple particle physics models that can accommodate the constraints. We point out challenges for building reasonable models and identify the most promising scenarios for getting isospin violation and inelasticity, as indicated by some phenomenological studies. If inelastic scattering is demanded, we need two new light gauge bosons, one of which kinetically mixes with the standard model hypercharge and has mass < 2 GeV, and another which couples to baryon number and has mass 6.8 +/- 0.2 GeV. Their interference gives the desired amount of isospin violation. The dark matter is nearly Dirac, but with small Majorana masses induced by spontaneous symmetry breaking, so that the gauge boson couplings become exactly off-diagonal in the mass basis, and the small mass splitting needed for inelasticity is simultaneously produced. If only elastic scattering is demanded, then an alternative model, with interference between the kinetically mixed gauge boson and a hidden sector scalar Higgs, is adequate to give the required isospin violation. In both cases, the light kinetically mixed gauge boson is in the range of interest for currently running fixed target experiments. |
hep-ph/0612223 | Thomas Schwetz | Thomas Schwetz | What is the probability that $\theta_{13}$ and CP violation will be
discovered in future neutrino oscillation experiments? | 11 pages, 5 figures | Phys.Lett.B648:54-59,2007 | 10.1016/j.physletb.2007.02.053 | CERN-PH-TH/2006-266 | hep-ph hep-ex | null | The sensitivity of future neutrino oscillation experiments is determined
within a frequentist framework by using a statistical procedure based on Monte
Carlo simulations. I consider the search for a non-zero value of the mixing
angle $\theta_{13}$ at the T2K and Double-Chooz experiments, as well as the
discovery of CP violation at the example of the T2HK experiment. The
probability that a discovery will be made at a given confidence level is
calculated as a function of the true parameter values by generating large
ensembles of artificial experiments. The interpretation of the commonly used
sensitivity limits is clarified.
| [
{
"created": "Tue, 19 Dec 2006 10:31:25 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Schwetz",
"Thomas",
""
]
] | The sensitivity of future neutrino oscillation experiments is determined within a frequentist framework by using a statistical procedure based on Monte Carlo simulations. I consider the search for a non-zero value of the mixing angle $\theta_{13}$ at the T2K and Double-Chooz experiments, as well as the discovery of CP violation at the example of the T2HK experiment. The probability that a discovery will be made at a given confidence level is calculated as a function of the true parameter values by generating large ensembles of artificial experiments. The interpretation of the commonly used sensitivity limits is clarified. |
hep-ph/9608272 | Nikolaos Tetradis | N. Tetradis (CERN) | The Electroweak Phase Transition through the Renormalization Group | 48 pages, 17 figures (some additions to the labels included in the
captions), LaTeX file | Nucl.Phys. B488 (1997) 92-140 | 10.1016/S0550-3213(97)00037-0 | CERN-TH/96-190 | hep-ph hep-lat hep-th | null | We study the high-temperature phase transitions for the Abelian and $SU(2)$
Higgs models, using the exact renormalization group. The evolution equation for
a properly-defined coarse-grained free energy is solved. The phase diagram of
the Abelian Higgs model has a region of second-order phase transitions governed
by fixed points, for which we calculate critical exponents and crossover
curves. It also has a region of first-order phase transitions, which we discuss
in terms of the coarse-grained free energy. The $SU(2)$ Higgs model for small
Higgs field masses has only first-order phase transitions. We derive their
properties and compare with lattice and perturbative results. For larger Higgs
field masses the strength of the first-order phase transitions diminishes. For
masses larger than 80-100 GeV we find evidence that they are replaced by
analytical crossovers.
| [
{
"created": "Thu, 8 Aug 1996 16:51:32 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Tetradis",
"N.",
"",
"CERN"
]
] | We study the high-temperature phase transitions for the Abelian and $SU(2)$ Higgs models, using the exact renormalization group. The evolution equation for a properly-defined coarse-grained free energy is solved. The phase diagram of the Abelian Higgs model has a region of second-order phase transitions governed by fixed points, for which we calculate critical exponents and crossover curves. It also has a region of first-order phase transitions, which we discuss in terms of the coarse-grained free energy. The $SU(2)$ Higgs model for small Higgs field masses has only first-order phase transitions. We derive their properties and compare with lattice and perturbative results. For larger Higgs field masses the strength of the first-order phase transitions diminishes. For masses larger than 80-100 GeV we find evidence that they are replaced by analytical crossovers. |
hep-ph/0209153 | Yakov Azimov | Ya. I. Azimov | Mixing and decays of rho- and omega-mesons | 22 pages, 1 eps fig | Eur.Phys.J.A16:209-219,2003 | 10.1140/epja/i2002-10084-x | null | hep-ph hep-ex nucl-th | null | Isospin violating mixing of \rho- and \omega-mesons is reconsidered in terms
of propagators. Its influence on various pairs of (\rho^0,\omega)-decays to the
same final states is demonstrated. Some of them, (\rho^0,\omega)\to\pi^+\pi^-
and (\rho^0,\omega)\to\pi^0\gamma, have been earlier discussed in the
literature, others (e.g., (\rho^0,\omega)\to\eta\gamma and (\rho^0,\omega)\to
e^+e^-) are new in this context. Changes in partial widths for all the decay
pairs are shown to be correlated. The set of present experimental data, though
yet inconclusive, provides some limits for the direct (\rho\omega)-coupling and
indirectly supports enhancement of \rho^0\to\pi^0\gamma in comparison with
\rho^{\pm}\to\pi^{\pm}\gamma, though not so large as in some previous
estimates.
| [
{
"created": "Fri, 13 Sep 2002 16:20:19 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Azimov",
"Ya. I.",
""
]
] | Isospin violating mixing of \rho- and \omega-mesons is reconsidered in terms of propagators. Its influence on various pairs of (\rho^0,\omega)-decays to the same final states is demonstrated. Some of them, (\rho^0,\omega)\to\pi^+\pi^- and (\rho^0,\omega)\to\pi^0\gamma, have been earlier discussed in the literature, others (e.g., (\rho^0,\omega)\to\eta\gamma and (\rho^0,\omega)\to e^+e^-) are new in this context. Changes in partial widths for all the decay pairs are shown to be correlated. The set of present experimental data, though yet inconclusive, provides some limits for the direct (\rho\omega)-coupling and indirectly supports enhancement of \rho^0\to\pi^0\gamma in comparison with \rho^{\pm}\to\pi^{\pm}\gamma, though not so large as in some previous estimates. |
hep-ph/0509338 | Jamal Jalilian-Marian | Jamal Jalilian-Marian | Photon $+$ Hadron Production in High Energy Deuteron (Proton)-Nucleus
Collisions | 10 pages, 5 figures | Nucl.Phys.A770:210-220,2006 | 10.1016/j.nuclphysa.2006.02.013 | INT-PUB 05-21 | hep-ph nucl-ex nucl-th | null | We apply the Color Glass Condensate formalism to photon $+$ hadron production
cross section in high energy deuteron (proton)-gold collisions at RHIC. We
investigate the dependence of the production cross section on the angle between
the produced hadron and photon for various rapidities and transverse momenta.
It is shown that the angular correlation between the produced hadron and photon
is a sensitive probe of the saturation dynamics.
| [
{
"created": "Thu, 29 Sep 2005 01:34:41 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Jalilian-Marian",
"Jamal",
""
]
] | We apply the Color Glass Condensate formalism to photon $+$ hadron production cross section in high energy deuteron (proton)-gold collisions at RHIC. We investigate the dependence of the production cross section on the angle between the produced hadron and photon for various rapidities and transverse momenta. It is shown that the angular correlation between the produced hadron and photon is a sensitive probe of the saturation dynamics. |
1305.2641 | Kirtiman Ghosh | Shreyashi Chakdar, Kirtiman Ghosh, S. Nandi and Santosh Kumar Rai | Collider signatures of mirror fermions in the framework of Left Right
Mirror Model | 26 pages, 11 figures | Phys. Rev. D 88,095005(2013) | 10.1103/PhysRevD.88.095005 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The idea of left-right symmetry with mirror fermions is very appealing from
the symmetry point of view. In this picture, unlike the Standard Model, the
symmetry is not only left-right symmetric, but each left handed fermion
multiplet is accompanied by new right handed fermion multiplet of opposite
chirality. In this work, we consider a gauge symmetry, $SU(3)_c \otimes
SU(2)_L\otimes SU(2)_R \otimes U(1)_{Y^\prime}$ supplemented by a discrete
$Z_2$ symmetry. Instead of having right handed multiplets for each left handed
multiplets of the same fermions as in the usual left-right model, the mirror
model include right handed doublets involving new fermions (called mirrors),
and similarly for each right handed singlet, there are corresponding mirror
singlets. Thus the gauge anomaly is naturally absent in this model, and the
model also provide a solution for the strong CP problem because of parity
conservation. The first stage of symmetry breaking is achieved by a doublet
mirror Higgs with a vacuum expectation value $\simeq 10^7$ GeV, needed to
explain the neutrino mass $\simeq 10^{-11}$ GeV. The mirror fermions can mix
with the ordinary fermions via a scalar which is singlet under the gauge
symmetry. In this model, only light mirror particles, having masses in the few
hundred GeV range are $\hat{e}, \hat{u}, \hat{d}$ with well-defined spectrum.
$\hat{u}$ and $\hat{d}$ can be pair produced at the LHC, and can be detected as
($u Z$) and ($d Z$) resonances. We discuss the signals of these mirror fermions
at the LHC, and find that the reach at the LHC can be as large as $m_{\hat
q}\simeq 800$ GeV.
| [
{
"created": "Sun, 12 May 2013 22:31:03 GMT",
"version": "v1"
}
] | 2013-11-20 | [
[
"Chakdar",
"Shreyashi",
""
],
[
"Ghosh",
"Kirtiman",
""
],
[
"Nandi",
"S.",
""
],
[
"Rai",
"Santosh Kumar",
""
]
] | The idea of left-right symmetry with mirror fermions is very appealing from the symmetry point of view. In this picture, unlike the Standard Model, the symmetry is not only left-right symmetric, but each left handed fermion multiplet is accompanied by new right handed fermion multiplet of opposite chirality. In this work, we consider a gauge symmetry, $SU(3)_c \otimes SU(2)_L\otimes SU(2)_R \otimes U(1)_{Y^\prime}$ supplemented by a discrete $Z_2$ symmetry. Instead of having right handed multiplets for each left handed multiplets of the same fermions as in the usual left-right model, the mirror model include right handed doublets involving new fermions (called mirrors), and similarly for each right handed singlet, there are corresponding mirror singlets. Thus the gauge anomaly is naturally absent in this model, and the model also provide a solution for the strong CP problem because of parity conservation. The first stage of symmetry breaking is achieved by a doublet mirror Higgs with a vacuum expectation value $\simeq 10^7$ GeV, needed to explain the neutrino mass $\simeq 10^{-11}$ GeV. The mirror fermions can mix with the ordinary fermions via a scalar which is singlet under the gauge symmetry. In this model, only light mirror particles, having masses in the few hundred GeV range are $\hat{e}, \hat{u}, \hat{d}$ with well-defined spectrum. $\hat{u}$ and $\hat{d}$ can be pair produced at the LHC, and can be detected as ($u Z$) and ($d Z$) resonances. We discuss the signals of these mirror fermions at the LHC, and find that the reach at the LHC can be as large as $m_{\hat q}\simeq 800$ GeV. |
hep-ph/9312272 | Christopher Kolda | G. L. Kane, Chris Kolda, Leszek Roszkowski and James D. Wells | Study of Constrained Minimal Supersymmetry | Michigan preprint UM-TH-93-24, LaTeX, 60 pages without figures.
Complete paper with inline figures available by anonymous ftp to
williams.physics.lsa.umich.edu in /pub/preprints/UM-TH-93-24.ps.Z
(uncompresses to 10MB / 77 pages), or by e-mailing request | Phys.Rev.D49:6173-6210,1994 | 10.1103/PhysRevD.49.6173 | null | hep-ph | null | Taking seriously phenomenological indications for supersymmetry, we have made
a detailed study of unified minimal SUSY, including effects at the few percent
level in a consistent fashion. We report here a general analysis without
choosing a particular unification gauge group. We find that the encouraging
SUSY unification results of recent years do survive the challenge of a more
complete and accurate analysis. Taking into account effects at the 5-10% level
leads to several improvements of previous results, and allows us to sharpen our
predictions for SUSY in the light of unification. We perform a thorough study
of the parameter space. The results form a well-defined basis for comparing the
physics potential of different facilities. Very little of the acceptable
parameter space has been excluded by LEP or FNAL so far, but a significant
fraction can be covered when these accelerators are upgraded. A number of
initial applications to the understanding of the SUSY spectrum, detectability
of SUSY at LEP II or FNAL, BR($b\to s\gamma$), Width($Z\to b\bar b$), dark
matter, etc, are included in a separate section. We formulate an approach to
extracting SUSY parameters from data when superpartners are detected. For small
tan(beta) or large $m_top$ both $M_half$ and $M_0$ are entirely bounded from
above at O(1 tev) without having to use a fine-tuning constraint.
| [
{
"created": "Mon, 13 Dec 1993 19:41:22 GMT",
"version": "v1"
}
] | 2009-09-15 | [
[
"Kane",
"G. L.",
""
],
[
"Kolda",
"Chris",
""
],
[
"Roszkowski",
"Leszek",
""
],
[
"Wells",
"James D.",
""
]
] | Taking seriously phenomenological indications for supersymmetry, we have made a detailed study of unified minimal SUSY, including effects at the few percent level in a consistent fashion. We report here a general analysis without choosing a particular unification gauge group. We find that the encouraging SUSY unification results of recent years do survive the challenge of a more complete and accurate analysis. Taking into account effects at the 5-10% level leads to several improvements of previous results, and allows us to sharpen our predictions for SUSY in the light of unification. We perform a thorough study of the parameter space. The results form a well-defined basis for comparing the physics potential of different facilities. Very little of the acceptable parameter space has been excluded by LEP or FNAL so far, but a significant fraction can be covered when these accelerators are upgraded. A number of initial applications to the understanding of the SUSY spectrum, detectability of SUSY at LEP II or FNAL, BR($b\to s\gamma$), Width($Z\to b\bar b$), dark matter, etc, are included in a separate section. We formulate an approach to extracting SUSY parameters from data when superpartners are detected. For small tan(beta) or large $m_top$ both $M_half$ and $M_0$ are entirely bounded from above at O(1 tev) without having to use a fine-tuning constraint. |
hep-ph/9511422 | Eric S. Swanson | Adam Szczepaniak, Eric S. Swanson, Chueng-Ryong Ji, and Stephen R.
Cotanch | Glueball Spectroscopy in a Relativistic Many-Body Approach to Hadron
Structure | 12 pages, 1 uuencoded ps figure, RevTex | Phys.Rev.Lett. 76 (1996) 2011-2014 | 10.1103/PhysRevLett.76.2011 | null | hep-ph hep-lat | null | A comprehensive, relativistic many-body approach to hadron structure is
advanced based on the Coulomb gauge QCD Hamiltonian. Our method incorporates
standard many-body techniques which render the approximations amenable to
systematic improvement. Using BCS variational methods, dynamic chiral symmetry
breaking naturally emerges and both quarks and gluons acquire constituent
masses. Gluonia are studied both in the valence and in the collective, random
phase approximations. Using representative values for the strong coupling
constant and string tension, calculated quenched glueball masses are found to
be in remarkable agreement with lattice gauge theory.
| [
{
"created": "Mon, 27 Nov 1995 15:34:32 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Szczepaniak",
"Adam",
""
],
[
"Swanson",
"Eric S.",
""
],
[
"Ji",
"Chueng-Ryong",
""
],
[
"Cotanch",
"Stephen R.",
""
]
] | A comprehensive, relativistic many-body approach to hadron structure is advanced based on the Coulomb gauge QCD Hamiltonian. Our method incorporates standard many-body techniques which render the approximations amenable to systematic improvement. Using BCS variational methods, dynamic chiral symmetry breaking naturally emerges and both quarks and gluons acquire constituent masses. Gluonia are studied both in the valence and in the collective, random phase approximations. Using representative values for the strong coupling constant and string tension, calculated quenched glueball masses are found to be in remarkable agreement with lattice gauge theory. |
1201.2281 | Bodo Lampe | Bodo Lampe | Chirality and Symmetry Breaking in a discrete internal Space | 42 pages, 3 tables | null | 10.1007/s10773-012-1190-y | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In previous papers the permutation group S_4 has been suggested as an
ordering scheme for elementary particles, and the appearance of this finite
symmetry group was taken as indication for the existence of a discrete inner
symmetry space underlying elementary particle interactions. Here it is pointed
out that a more suitable choice than the tetrahedral group S_4 is the
pyritohedral group A_4 x Z_2 because its vibrational spectrum exhibits exactly
the mass multiplet structure of the 3 fermion generations. Furthermore it is
noted that the same structure can also be obtained from a primordial symmetry
breaking S_4 --> A_4. Since A_4 is a chiral group, while S_4 is achiral, an
argument can be given why the chirality of the inner pyritohedral symmetry
leads to parity violation of the weak interactions.
| [
{
"created": "Wed, 11 Jan 2012 11:16:27 GMT",
"version": "v1"
}
] | 2015-06-03 | [
[
"Lampe",
"Bodo",
""
]
] | In previous papers the permutation group S_4 has been suggested as an ordering scheme for elementary particles, and the appearance of this finite symmetry group was taken as indication for the existence of a discrete inner symmetry space underlying elementary particle interactions. Here it is pointed out that a more suitable choice than the tetrahedral group S_4 is the pyritohedral group A_4 x Z_2 because its vibrational spectrum exhibits exactly the mass multiplet structure of the 3 fermion generations. Furthermore it is noted that the same structure can also be obtained from a primordial symmetry breaking S_4 --> A_4. Since A_4 is a chiral group, while S_4 is achiral, an argument can be given why the chirality of the inner pyritohedral symmetry leads to parity violation of the weak interactions. |
hep-ph/9609506 | Haim Goldberg | Haim Goldberg | Thermodynamics of Hidden Sector Gaugino Condensation in the Expanding
Universe | 13 pages LaTex, no figures | Phys.Lett. B394 (1997) 43-48 | 10.1016/S0370-2693(96)01678-4 | NUB-3144/96-Th | hep-ph | null | This work examines the confining-deconfining phase transition in a hidden
Yang Mills sector with scale $\Lambda \sim 10^{14}$ GeV appropriate to dilaton
stabilization and SUSY-breaking via formation of a gaugino consensate. If the
transition is assumed to take place through homogenous nucleation, then under
reasonable assumptions it is found that a critical bubble, formed at a
temperature which provides enough supercooling, is not large enough to
accommodate an adequate number $(\gsim 100)$ of quanta of the confined phase
(`hidden hadrons') to allow a consistent thermodynamic description. Thus, a
first order transition in the hidden sector may not be possible in the
expanding universe.
| [
{
"created": "Fri, 27 Sep 1996 16:45:47 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Goldberg",
"Haim",
""
]
] | This work examines the confining-deconfining phase transition in a hidden Yang Mills sector with scale $\Lambda \sim 10^{14}$ GeV appropriate to dilaton stabilization and SUSY-breaking via formation of a gaugino consensate. If the transition is assumed to take place through homogenous nucleation, then under reasonable assumptions it is found that a critical bubble, formed at a temperature which provides enough supercooling, is not large enough to accommodate an adequate number $(\gsim 100)$ of quanta of the confined phase (`hidden hadrons') to allow a consistent thermodynamic description. Thus, a first order transition in the hidden sector may not be possible in the expanding universe. |
1904.12882 | Ted Rogers | M. Boglione, A. Dotson, L. Gamberg, S. Gordon, J. O.
Gonzalez-Hernandez, A. Prokudin, T. C. Rogers, N. Sato | Mapping the Kinematical Regimes of Semi-Inclusive Deep Inelastic
Scattering | 37 pages, 11 Figures | JHEP10(2019)122 | 10.1007/JHEP10(2019)122 | null | hep-ph nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct a language for identifying kinematical regions of transversely
differential semi-inclusive deep inelastic scattering cross sections with
particular underlying partonic pictures, especially in regions of moderate to
low $Q$ where sensitivity to kinematical effects outside the usual very high
energy limit becomes non-trivial. The partonic pictures map to power law
expansions whose leading contributions ultimately lead to well-known QCD
factorization theorems. We propose methods for estimating the consistency of
any particular region of overall hadronic kinematics with the kinematics of a
given underlying partonic picture. The basic setup of kinematics of
semi-inclusive deep inelastic scattering is also reviewed in some detail.
| [
{
"created": "Mon, 29 Apr 2019 18:01:44 GMT",
"version": "v1"
}
] | 2019-11-01 | [
[
"Boglione",
"M.",
""
],
[
"Dotson",
"A.",
""
],
[
"Gamberg",
"L.",
""
],
[
"Gordon",
"S.",
""
],
[
"Gonzalez-Hernandez",
"J. O.",
""
],
[
"Prokudin",
"A.",
""
],
[
"Rogers",
"T. C.",
""
],
[
"Sato",... | We construct a language for identifying kinematical regions of transversely differential semi-inclusive deep inelastic scattering cross sections with particular underlying partonic pictures, especially in regions of moderate to low $Q$ where sensitivity to kinematical effects outside the usual very high energy limit becomes non-trivial. The partonic pictures map to power law expansions whose leading contributions ultimately lead to well-known QCD factorization theorems. We propose methods for estimating the consistency of any particular region of overall hadronic kinematics with the kinematics of a given underlying partonic picture. The basic setup of kinematics of semi-inclusive deep inelastic scattering is also reviewed in some detail. |
0803.0497 | Ben Gripaios | Ben Gripaios | Anomaly Holography, the Wess-Zumino-Witten Term, and Electroweak
Symmetry Breaking | 7 pp | Phys.Lett.B663:419-423,2008 | 10.1016/j.physletb.2008.04.046 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I consider anomalies in effective field theories (EFTs) of gauge fields
coupled to fermions on an interval in AdS_5, and their holographic duals. The
anomalies give rise to constraints on the consistent EFT description, which are
stronger than the usual four-dimensional anomaly cancellation condition for the
zero modes. Even though the anomalies occur on both boundaries of the interval,
corresponding to both the UV and the IR of the holographic dual, they are
nevertheless consistent with the non-renormalization of the anomaly and the 't
Hooft matching condition. They give rise, in general, to a Wess-Zumino-Witten
(WZW) term in the four-dimensional, low-energy effective action, whose form I
compute. Finally I discuss the relevance to holographic models of electroweak
symmetry breaking. I show that the so-called `minimal composite Higgs models'
have a consistent EFT description without a WZW term. In contrast, a variant of
an earlier model of Contino, Nomura, and Pomarol does have a WZW term.
| [
{
"created": "Tue, 4 Mar 2008 17:02:07 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Gripaios",
"Ben",
""
]
] | I consider anomalies in effective field theories (EFTs) of gauge fields coupled to fermions on an interval in AdS_5, and their holographic duals. The anomalies give rise to constraints on the consistent EFT description, which are stronger than the usual four-dimensional anomaly cancellation condition for the zero modes. Even though the anomalies occur on both boundaries of the interval, corresponding to both the UV and the IR of the holographic dual, they are nevertheless consistent with the non-renormalization of the anomaly and the 't Hooft matching condition. They give rise, in general, to a Wess-Zumino-Witten (WZW) term in the four-dimensional, low-energy effective action, whose form I compute. Finally I discuss the relevance to holographic models of electroweak symmetry breaking. I show that the so-called `minimal composite Higgs models' have a consistent EFT description without a WZW term. In contrast, a variant of an earlier model of Contino, Nomura, and Pomarol does have a WZW term. |
hep-ph/0209159 | Iain W. Stewart | Iain W. Stewart | Factorization, Effective Field Theory, and B-> D^(*) X Decays | 7 pages, 3 figs, Invited plenary talk at the 5th International
Conference on Hyperons, Charm, and Beauty Hadrons, Vancouver, June 2002 | Nucl.Phys.Proc.Suppl. 115 (2003) 107-113 | 10.1016/S0920-5632(02)01964-3 | INT-PUB 02-45 | hep-ph | null | In this proceedings I review the soft-collinear effective theory (SCET), an
effective theory for energetic particles. I also discuss factorization in
exclusive and inclusive B-> D^(*)X decays, and tests which can help distinguish
whether factorization is a result of a large energy limit, the large N_c limit,
or a combination of the two.
| [
{
"created": "Sat, 14 Sep 2002 02:37:42 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Nov 2002 01:02:05 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Stewart",
"Iain W.",
""
]
] | In this proceedings I review the soft-collinear effective theory (SCET), an effective theory for energetic particles. I also discuss factorization in exclusive and inclusive B-> D^(*)X decays, and tests which can help distinguish whether factorization is a result of a large energy limit, the large N_c limit, or a combination of the two. |
hep-ph/9602206 | Nir Polonsky | Nir Polonsky | On Supersymmetric b-tau Unification, Gauge Unification, and Fixed Points | 17 pages + 7 postscript figures (packaged as a .uu file), LaTex +
RevTex 3 | Phys.Rev. D54 (1996) 4537-4547 | 10.1103/PhysRevD.54.4537 | LMU-TPW-96-04 | hep-ph | null | The equality assumption of the b and tau Yukawa couplings at the
grand-unification scale can strongly constrain the allowed parameter space of
supersymmetric models. We examine the constraints in the case that there is a
discrepancy > 10% in the gauge coupling unification assumption (which
necessarily implies large perturbations at the grand scale). The constraints
are shown to diminish in that case [most significantly so if alpha_{s}(M_{Z})
\approx 0.11]. In particular, the requirement that the t Yukawa coupling,
h_{t}, is near its quasi-fixed point may not be necessary. We discuss the
colored-triplet threshold as a simple example of a source for the
discrepancies, and comment on its possible implications. In addition, we point
out that supersymmetric (as well as unification-scale) threshold corrections to
h_{t} shift the fixed-point curve in the m_{t} - \tan\beta plane. The
implications for the prediction of the Higgs boson mass are briefly discussed.
| [
{
"created": "Thu, 1 Feb 1996 19:32:49 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Polonsky",
"Nir",
""
]
] | The equality assumption of the b and tau Yukawa couplings at the grand-unification scale can strongly constrain the allowed parameter space of supersymmetric models. We examine the constraints in the case that there is a discrepancy > 10% in the gauge coupling unification assumption (which necessarily implies large perturbations at the grand scale). The constraints are shown to diminish in that case [most significantly so if alpha_{s}(M_{Z}) \approx 0.11]. In particular, the requirement that the t Yukawa coupling, h_{t}, is near its quasi-fixed point may not be necessary. We discuss the colored-triplet threshold as a simple example of a source for the discrepancies, and comment on its possible implications. In addition, we point out that supersymmetric (as well as unification-scale) threshold corrections to h_{t} shift the fixed-point curve in the m_{t} - \tan\beta plane. The implications for the prediction of the Higgs boson mass are briefly discussed. |
1405.6050 | A. Tolga Tasci | A. Senol, A. T. Tasci, I. T. Cakir and O. Cakir | Anomalous $HZ\gamma$ couplings in photon-induced collisions at the LHC | 10 pages, 7 figures, 3 tables | Mod. Phys. Lett. A, Vol. 29, No. 36 (2014) 1450186 | 10.1142/S0217732314501867 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have examined $HZ\gamma$ vertex to obtain the limits on anomalous
$a_\gamma$, $b_\gamma$ and $\tilde b_\gamma$ couplings in a model independent
way through the $\gamma p$ collisions via the process $pp\to p \gamma p\to
pHqX$. The sensitivities to the anomalous couplings can be obtained as
$|b_\gamma|$, $|\tilde{b}_\gamma|\sim 10^{-3}$ for the integrated luminosity of
$L_{int}=100 ~\mathrm{fb}^{-1}$ at the LHC with $\sqrt{s}=14$ TeV.
| [
{
"created": "Fri, 23 May 2014 12:57:24 GMT",
"version": "v1"
}
] | 2014-11-14 | [
[
"Senol",
"A.",
""
],
[
"Tasci",
"A. T.",
""
],
[
"Cakir",
"I. T.",
""
],
[
"Cakir",
"O.",
""
]
] | We have examined $HZ\gamma$ vertex to obtain the limits on anomalous $a_\gamma$, $b_\gamma$ and $\tilde b_\gamma$ couplings in a model independent way through the $\gamma p$ collisions via the process $pp\to p \gamma p\to pHqX$. The sensitivities to the anomalous couplings can be obtained as $|b_\gamma|$, $|\tilde{b}_\gamma|\sim 10^{-3}$ for the integrated luminosity of $L_{int}=100 ~\mathrm{fb}^{-1}$ at the LHC with $\sqrt{s}=14$ TeV. |
1809.01063 | Maria Manuela Saez | M.M. Saez and M.E. Mosquera and O. Civitarese | Effects of neutrino mixing upon electron fraction in core collapse
supernovae | null | Boletin de la Asociacion Argentina de Astronomia. Volumen 60. 2018 | null | ISSN 1669-9521 | hep-ph astro-ph.SR nucl-th physics.space-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The inclusion of massive neutrinos affects the cross sections involved in the
formation of heavy nuclei, modifying their abundances. Rapid neutron capture
processes (r-process) are often associated with explosive events such as
core-collapse supernovae. In this work we study the effects of active and
sterile neutrino oscillations and interactions, upon the calculation of
neutrino fluxes, the baryonic density and the electron fraction of the
material. We have considered two different initial distribution functions of
the neutrinos and different combinations of mixing parameters (including
{\theta} 34 = 0). We use the formalism of density matrices for the calculations
and included the effects of neutrino oscillations, interactions with matter and
self-neutrino interactions. We found that the interactions of the neutrinos
with matter and with themselves change the electron fraction, affecting the
onset of the r-process.
| [
{
"created": "Tue, 4 Sep 2018 16:12:10 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Sep 2018 22:07:46 GMT",
"version": "v2"
}
] | 2018-09-10 | [
[
"Saez",
"M. M.",
""
],
[
"Mosquera",
"M. E.",
""
],
[
"Civitarese",
"O.",
""
]
] | The inclusion of massive neutrinos affects the cross sections involved in the formation of heavy nuclei, modifying their abundances. Rapid neutron capture processes (r-process) are often associated with explosive events such as core-collapse supernovae. In this work we study the effects of active and sterile neutrino oscillations and interactions, upon the calculation of neutrino fluxes, the baryonic density and the electron fraction of the material. We have considered two different initial distribution functions of the neutrinos and different combinations of mixing parameters (including {\theta} 34 = 0). We use the formalism of density matrices for the calculations and included the effects of neutrino oscillations, interactions with matter and self-neutrino interactions. We found that the interactions of the neutrinos with matter and with themselves change the electron fraction, affecting the onset of the r-process. |
hep-ph/0204094 | Fernando Monti Steffens | F. M. Steffens | A Constraint on the x Dependence of the Light Antiquarks Ratio | no figures | Phys.Lett.B541:346-349,2002 | 10.1016/S0370-2693(02)02273-6 | null | hep-ph hep-ex | null | We perform a careful study on the effect of the Pauli blocking to the light
antiquark structure of the proton sea. We develop the formal expressions for
the antiquark distributions, highlighting the role played by quark statistics
and the vacuum structure. Ratios involving the antiquarks are calculated. In
particular, it is found that $\Delta\bar{d}(x)/\Delta\bar{u}(x)$ should be
negative and x independent.
| [
{
"created": "Tue, 9 Apr 2002 11:20:55 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Steffens",
"F. M.",
""
]
] | We perform a careful study on the effect of the Pauli blocking to the light antiquark structure of the proton sea. We develop the formal expressions for the antiquark distributions, highlighting the role played by quark statistics and the vacuum structure. Ratios involving the antiquarks are calculated. In particular, it is found that $\Delta\bar{d}(x)/\Delta\bar{u}(x)$ should be negative and x independent. |
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