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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1206.2124 | Alan D. Martin | A. D. Martin, H. Hoeth, V. A. Khoze, F. Krauss, M. G. Ryskin and K.
Zapp | Diffractive Physics | 9 pages, 4 figures, Plenary talk at 6th International Conference on
Quarks and Nuclear Physics, Ecole Polytechnique, Palaiseau, Paris, April 2012 | null | null | IPPP/12/39; DCPT/12/78 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | `Soft' high-energy interactions are clearly important in pp collisions.
Indeed, these events are dominant by many orders of magnitude, and about 40%
are of diffractive origin; that is, due to elastic scattering or proton
dissociation. Moreover, soft interactions unavoidably give an underlying
component to the rare `hard' events, from which we hope to extract new physics.
Here, we discuss how to quantify this contamination. First we present a brief
introduction to diffraction. We emphasize the different treatment required for
proton dissociation into low- and high-mass systems; the former requiring a
multichannel eikonal approach, and the latter the computation of triple-Pomeron
diagrams with multi-Pomeron corrections. Then we give an overview of the
Pomeron, and explain how the QCD (BFKL-type) Pomeron is the natural object to
continue from the `hard' to the `soft' domain. In this way we can obtain a
partonic description of soft interactions. We introduce the so-called KMR
model, based on this partonic approach, which includes absorptive multi-Pomeron
corrections that become increasingly important as we proceed further into the
soft domain. This model is able to describe total, elastic and proton
dissociation data, and to predict the survival probability of large rapidity
gaps to soft rescattering --- in terms of a few physically-motivated
parameters. However, more differential phenomena, such as single particle p_t
distributions, can only be satisfactorily described if hadronization effects
are included. This is achieved by incorporating the KMR analytic approach into
the SHERPA Monte Carlo framework. It allows a description of soft physics and
diffraction, together with jet physics, in a coherent, self-consistent way. We
outline the structure, and show a few results, of this Monte Carlo, which we
call SHRiMPS, for reasons which will become clear.
| [
{
"created": "Mon, 11 Jun 2012 08:31:50 GMT",
"version": "v1"
}
] | 2012-06-12 | [
[
"Martin",
"A. D.",
""
],
[
"Hoeth",
"H.",
""
],
[
"Khoze",
"V. A.",
""
],
[
"Krauss",
"F.",
""
],
[
"Ryskin",
"M. G.",
""
],
[
"Zapp",
"K.",
""
]
] | `Soft' high-energy interactions are clearly important in pp collisions. Indeed, these events are dominant by many orders of magnitude, and about 40% are of diffractive origin; that is, due to elastic scattering or proton dissociation. Moreover, soft interactions unavoidably give an underlying component to the rare `hard' events, from which we hope to extract new physics. Here, we discuss how to quantify this contamination. First we present a brief introduction to diffraction. We emphasize the different treatment required for proton dissociation into low- and high-mass systems; the former requiring a multichannel eikonal approach, and the latter the computation of triple-Pomeron diagrams with multi-Pomeron corrections. Then we give an overview of the Pomeron, and explain how the QCD (BFKL-type) Pomeron is the natural object to continue from the `hard' to the `soft' domain. In this way we can obtain a partonic description of soft interactions. We introduce the so-called KMR model, based on this partonic approach, which includes absorptive multi-Pomeron corrections that become increasingly important as we proceed further into the soft domain. This model is able to describe total, elastic and proton dissociation data, and to predict the survival probability of large rapidity gaps to soft rescattering --- in terms of a few physically-motivated parameters. However, more differential phenomena, such as single particle p_t distributions, can only be satisfactorily described if hadronization effects are included. This is achieved by incorporating the KMR analytic approach into the SHERPA Monte Carlo framework. It allows a description of soft physics and diffraction, together with jet physics, in a coherent, self-consistent way. We outline the structure, and show a few results, of this Monte Carlo, which we call SHRiMPS, for reasons which will become clear. |
1209.2394 | Katarzyna Krajewska | K. Krajewska and J. Z. Kaminski | Breit-Wheeler Process in Intense Short Laser Pulses | 13 pages, 8 figures | Phys. Rev A 86, 052104 (2012) | 10.1103/PhysRevA.86.052104 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Energy-angular distributions of electron-positron pair creation in collisions
of a laser beam and a nonlaser photon are calculated using the $S$-matrix
formalism. The laser field is modeled as a finite pulse, similar to the
formulation introduced in our recent paper in the context of Compton scattering
[Phys. Rev. A {\bf 85}, 062102 (2012)]. The nonperturbative regime of pair
creation is considered here. The energy spectra of created particles are
compared with the corresponding spectra obtained using the modulated plane wave
approximation for the driving laser field. A very good agreement in these two
cases is observed, provided that the laser pulse is sufficiently long. For
short pulse durations, this agreement breaks down. The sensitivity of pair
production to the polarization of a driving pulse is also investigated. We show
that in the nonperturbative regime, the pair creation yields depend on the
polarization of the pulse, reaching their maximal values for the linear
polarization. Therefore, we focus on this case. Specifically, we analyze the
dependence of pair creation on the relative configuration of linear
polarizations of the laser pulse and the nonlaser photon. Lastly, we
investigate the carrier-envelope phase effect on angular distributions of
created particles, suggesting the possibility of phase control in relation to
the pair creation processes.
| [
{
"created": "Tue, 11 Sep 2012 18:48:21 GMT",
"version": "v1"
}
] | 2015-06-11 | [
[
"Krajewska",
"K.",
""
],
[
"Kaminski",
"J. Z.",
""
]
] | Energy-angular distributions of electron-positron pair creation in collisions of a laser beam and a nonlaser photon are calculated using the $S$-matrix formalism. The laser field is modeled as a finite pulse, similar to the formulation introduced in our recent paper in the context of Compton scattering [Phys. Rev. A {\bf 85}, 062102 (2012)]. The nonperturbative regime of pair creation is considered here. The energy spectra of created particles are compared with the corresponding spectra obtained using the modulated plane wave approximation for the driving laser field. A very good agreement in these two cases is observed, provided that the laser pulse is sufficiently long. For short pulse durations, this agreement breaks down. The sensitivity of pair production to the polarization of a driving pulse is also investigated. We show that in the nonperturbative regime, the pair creation yields depend on the polarization of the pulse, reaching their maximal values for the linear polarization. Therefore, we focus on this case. Specifically, we analyze the dependence of pair creation on the relative configuration of linear polarizations of the laser pulse and the nonlaser photon. Lastly, we investigate the carrier-envelope phase effect on angular distributions of created particles, suggesting the possibility of phase control in relation to the pair creation processes. |
1702.06558 | Ignazio Scimemi | Daniel Gutierrez-Reyes, Ignazio Scimemi, Alexey A. Vladimirov | Twist-2 matching of transverse momentum dependent distributions | 7 pages; In v2 we correct a sign typo. Conclusions are unchanged | null | 10.1016/j.physletb.2017.03.031 | null | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We systematically study the large-$q_T$ (or small-$b$) matching of transverse
momentum dependent (TMD) distributions to the twist-2 integrated parton
distributions. Performing operator product expansion for a generic TMD operator
at the next-to-leading order (NLO) we found the complete set of TMD
distributions that match twist-2. These are unpolarized, helicity,
transversity, pretzelosity and linearly polarized gluon distributions. The NLO
matching coefficients for these distributions are presented. The pretzelosity
matching coefficient is zero at the presented order, however, it is evident
that it is non-zero in the following orders. This result offers a natural
explanation of the small value of pretzelosity found in phenomenological fits.
We also demonstrate that the cancellation of rapidity divergences by the
leading order soft factor imposes the necessary requirement on the Lorentz
structure of TMD operators, which is supported only by the TMD distributions of
leading dynamical twist. Additionally, this requirement puts restrictions on
the $\gamma_5$-definition in the dimensional regularization.
| [
{
"created": "Tue, 21 Feb 2017 19:26:05 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Aug 2017 11:51:25 GMT",
"version": "v2"
}
] | 2017-08-15 | [
[
"Gutierrez-Reyes",
"Daniel",
""
],
[
"Scimemi",
"Ignazio",
""
],
[
"Vladimirov",
"Alexey A.",
""
]
] | We systematically study the large-$q_T$ (or small-$b$) matching of transverse momentum dependent (TMD) distributions to the twist-2 integrated parton distributions. Performing operator product expansion for a generic TMD operator at the next-to-leading order (NLO) we found the complete set of TMD distributions that match twist-2. These are unpolarized, helicity, transversity, pretzelosity and linearly polarized gluon distributions. The NLO matching coefficients for these distributions are presented. The pretzelosity matching coefficient is zero at the presented order, however, it is evident that it is non-zero in the following orders. This result offers a natural explanation of the small value of pretzelosity found in phenomenological fits. We also demonstrate that the cancellation of rapidity divergences by the leading order soft factor imposes the necessary requirement on the Lorentz structure of TMD operators, which is supported only by the TMD distributions of leading dynamical twist. Additionally, this requirement puts restrictions on the $\gamma_5$-definition in the dimensional regularization. |
2304.12401 | D.N. Triantafyllopoulos | E. Iancu, A.H. Mueller, D.N. Triantafyllopoulos, S.Y. Wei | Probing gluon saturation via diffractive jets in ultra-peripheral
nucleus-nucleus collisions | 23 pages, 9 figures | null | null | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We argue that semi-inclusive photo-production of a pair of hard jets via
coherent diffraction in nucleus-nucleus ultra-peripheral collisions at high
energy is a golden channel to study gluon saturation. The dominant contribution
is the diffractive production of three jets in an asymmetric configuration. Two
of the jets are hard and propagate at nearly central pseudo-rapidities. The
third jet is semi-hard, with transverse momentum comparable to the nuclear
saturation momentum, and is well separated in pseudo-rapidity from the hard
dijets. The emission of the semi-hard jet allows for strong scattering, thus
avoiding the "higher-twist" suppression of the exclusive dijet production due
to colour transparency. We compute the trijet cross-section using the
diffractive TMD factorisation which emerges from the CGC effective theory at
high energy. The cross-section is controlled by gluon saturation, which leaves
its imprints on the structure of the final state, notably on the rapidity
distribution.
| [
{
"created": "Mon, 24 Apr 2023 19:17:41 GMT",
"version": "v1"
}
] | 2023-04-26 | [
[
"Iancu",
"E.",
""
],
[
"Mueller",
"A. H.",
""
],
[
"Triantafyllopoulos",
"D. N.",
""
],
[
"Wei",
"S. Y.",
""
]
] | We argue that semi-inclusive photo-production of a pair of hard jets via coherent diffraction in nucleus-nucleus ultra-peripheral collisions at high energy is a golden channel to study gluon saturation. The dominant contribution is the diffractive production of three jets in an asymmetric configuration. Two of the jets are hard and propagate at nearly central pseudo-rapidities. The third jet is semi-hard, with transverse momentum comparable to the nuclear saturation momentum, and is well separated in pseudo-rapidity from the hard dijets. The emission of the semi-hard jet allows for strong scattering, thus avoiding the "higher-twist" suppression of the exclusive dijet production due to colour transparency. We compute the trijet cross-section using the diffractive TMD factorisation which emerges from the CGC effective theory at high energy. The cross-section is controlled by gluon saturation, which leaves its imprints on the structure of the final state, notably on the rapidity distribution. |
hep-ph/9612334 | Carlos Wagner | M. Carena, G.F. Giudice, S. Lola and C.E.M. Wagner | Four-jet Signal at LEP2 and Supersymmetry | 15 pages, LateX, 5 figures. A few typos were corrected. A reference
was added | Phys.Lett.B395:225-233,1997 | 10.1016/S0370-2693(97)00063-4 | CERN-TH/96-352 | hep-ph | null | ALEPH has reported a significant excess of four-jet events in the LEP runs
above the Z^0 resonance, which however has not been confirmed by the other LEP
collaborations. We assume here that this excess corresponds to a physics signal
and try to interpret it in the context of supersymmetric models with R-parity
violation. Associated production of a left and right selectron can explain all
the distinctive features of the ALEPH data: the value of the cross section, the
di-jet mass difference, the absence of bottom quarks in the final state, and
the di-jet charge content. Our proposed scenario makes definite predictions
which can be tested at future LEP runs at higher energies.
| [
{
"created": "Thu, 12 Dec 1996 00:59:01 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Dec 1996 16:39:02 GMT",
"version": "v2"
}
] | 2016-09-06 | [
[
"Carena",
"M.",
""
],
[
"Giudice",
"G. F.",
""
],
[
"Lola",
"S.",
""
],
[
"Wagner",
"C. E. M.",
""
]
] | ALEPH has reported a significant excess of four-jet events in the LEP runs above the Z^0 resonance, which however has not been confirmed by the other LEP collaborations. We assume here that this excess corresponds to a physics signal and try to interpret it in the context of supersymmetric models with R-parity violation. Associated production of a left and right selectron can explain all the distinctive features of the ALEPH data: the value of the cross section, the di-jet mass difference, the absence of bottom quarks in the final state, and the di-jet charge content. Our proposed scenario makes definite predictions which can be tested at future LEP runs at higher energies. |
hep-ph/9611263 | Hooman Davoudiasl | Hooman Davoudiasl | Non-linear Sigma Model Solutions for the Disoriented Chiral Condensate
at O(p^4) | 14 pages, 6 postscript figures, RevTex | Phys.Lett. B397 (1997) 234-240 | 10.1016/S0370-2693(97)00175-5 | CALT-68-2084 | hep-ph | null | Boost-invariant (1+1) dimensional solutions for the Disoriented Chiral
Condensate (DCC) are obtained numerically, in the context of the $SU(2)_L
\otimes SU(2)_R$ non-linear sigma model at O(p^4) in the momentum expansion. We
ignore the mass terms in the Lagrangian, as we are mainly interested in the
behavior of the solutions for small values of proper time $\tau$. The solutions
obtained at O(p^4) are matched to those of O(p^2) at a late proper time $\tau
\gg 1/m_\pi$, where $m_\pi = 140$ MeV is the mass of the pion. We find that at
O(p^4) the solutions for the DCC do not have singular behavior at early proper
times $\tau \ll 1/m_\pi$. The solutions indicate that for $\tau \lsim
(0.5-0.8)$ fm the O(p^4) corrections become important. We take the sizes of the
field derivatives to be indicators of the validity of the momentum expansion.
Thus, we deduce that the O(p^4) solutions can be used to represent the
qualitative behavior of the DCC down to proper times of about 0.2 fm. Since
below $\sim 0.2$ fm the formalism is not reliable, we conclude that the
inclusion of higher order terms beyond O(p^4) is not needed to extend the
validity of the solutions to earlier proper times.
| [
{
"created": "Thu, 7 Nov 1996 11:04:13 GMT",
"version": "v1"
}
] | 2016-09-06 | [
[
"Davoudiasl",
"Hooman",
""
]
] | Boost-invariant (1+1) dimensional solutions for the Disoriented Chiral Condensate (DCC) are obtained numerically, in the context of the $SU(2)_L \otimes SU(2)_R$ non-linear sigma model at O(p^4) in the momentum expansion. We ignore the mass terms in the Lagrangian, as we are mainly interested in the behavior of the solutions for small values of proper time $\tau$. The solutions obtained at O(p^4) are matched to those of O(p^2) at a late proper time $\tau \gg 1/m_\pi$, where $m_\pi = 140$ MeV is the mass of the pion. We find that at O(p^4) the solutions for the DCC do not have singular behavior at early proper times $\tau \ll 1/m_\pi$. The solutions indicate that for $\tau \lsim (0.5-0.8)$ fm the O(p^4) corrections become important. We take the sizes of the field derivatives to be indicators of the validity of the momentum expansion. Thus, we deduce that the O(p^4) solutions can be used to represent the qualitative behavior of the DCC down to proper times of about 0.2 fm. Since below $\sim 0.2$ fm the formalism is not reliable, we conclude that the inclusion of higher order terms beyond O(p^4) is not needed to extend the validity of the solutions to earlier proper times. |
hep-ph/9411371 | Thomas Teubner | R. Harlander, M. Je\.zabek, J.H. K\"uhn and T. Teubner | Polarization in Top Quark Production and Decay near Threshold | 6 pages, LaTex (uses epsf.sty, 2 figures appended as uuencoded ps
files). The complete paper, including figures, is also available via
anonymous ftp at ttpux2.physik.uni-karlsruhe.de (129.13.102.139) as
/ttp94-24/ttp94-24.ps, or via www at
http://ttpux2.physik.uni-karlsruhe.de/preprints.html/ | null | 10.1063/1.48895 | TTP94-24 | hep-ph | null | Theoretical results are presented for top quarks produced in annihilation of
polarized electrons on positrons. Polarization studies for $t\bar t$ pairs near
threshold are free from hadronization ambiguities. This is due to the short
lifetime of the top quark. Semileptonic decays are discussed as well as their
applications in studying polarization dependent processes involving top quarks.
The Green function formalism is applied to $t\bar t$ production at future
$e^+e^-$ colliders with polarized beams. Lippmann--Schwinger equation is solved
numerically for the QCD chromostatic potential given by the two-loop formula at
large momentum transfers and Richardson ansatz at intermediate and small ones.
The polarization dependent momentum distributions of top quarks and their decay
products are calculated.
| [
{
"created": "Wed, 23 Nov 1994 14:14:45 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Harlander",
"R.",
""
],
[
"Jeżabek",
"M.",
""
],
[
"Kühn",
"J. H.",
""
],
[
"Teubner",
"T.",
""
]
] | Theoretical results are presented for top quarks produced in annihilation of polarized electrons on positrons. Polarization studies for $t\bar t$ pairs near threshold are free from hadronization ambiguities. This is due to the short lifetime of the top quark. Semileptonic decays are discussed as well as their applications in studying polarization dependent processes involving top quarks. The Green function formalism is applied to $t\bar t$ production at future $e^+e^-$ colliders with polarized beams. Lippmann--Schwinger equation is solved numerically for the QCD chromostatic potential given by the two-loop formula at large momentum transfers and Richardson ansatz at intermediate and small ones. The polarization dependent momentum distributions of top quarks and their decay products are calculated. |
hep-ph/0304284 | Johan Bijnens | Johan Bijnens (Lund) | Chiral Perturbation Theory at Two Loops and the Measurement of $V_{us}$ | 4 pages, talk given at 38th Rencontres de Moriond on QCD and
High-Energy Hadronic Interactions, Les Arcs, Savoie, France, 22-29 Mar 2003 | null | null | LU TP 03-19 | hep-ph | null | I give an overview of the calculations done in three-flavour Chiral
perturbation theory at next-to-next-to-leading order with an emphasis on those
relevant for an improvement in the accuracy of the measurement of $V_{us}$. It
is pointed out that all needed low energy constants can be obtained from
experiment via the scalar form-factor in $K_{\ell3}$ decays
| [
{
"created": "Wed, 30 Apr 2003 07:24:55 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Bijnens",
"Johan",
"",
"Lund"
]
] | I give an overview of the calculations done in three-flavour Chiral perturbation theory at next-to-next-to-leading order with an emphasis on those relevant for an improvement in the accuracy of the measurement of $V_{us}$. It is pointed out that all needed low energy constants can be obtained from experiment via the scalar form-factor in $K_{\ell3}$ decays |
1412.6394 | Ulrich Ellwanger | Ulrich Ellwanger and Ana M. Teixeira | Excessive Higgs pair production with little MET from squarks and gluinos
in the NMSSM | 16 pages, 10 figures | null | 10.1007/JHEP04(2015)172 | LPT Orsay 14-91, PCCF RI 14-09 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the presence of a light singlino-like LSP in the NMSSM, the missing
transverse energy - MET - signature of squark/gluino production can be
considerably reduced. Instead, a pair of Higgs bosons is produced in each
event. We propose benchmark points for such scenarios, which differ in the
squark and gluino masses, and in their decay cascades. Events for these points
are simulated for the run II of the LHC at 13 TeV centre of mass energy. After
cuts on the transverse momenta of at least four jets, and requiring two
tau-leptons from one Higgs decay, we find that the invariant mass of two b-jets
from the other Higgs decay shows clear peaks above the background. Despite the
reduced MET, this search strategy allows to see signals for sufficiently large
integrated luminosities, depending on the squark/gluino masses.
| [
{
"created": "Fri, 19 Dec 2014 15:50:40 GMT",
"version": "v1"
}
] | 2015-05-20 | [
[
"Ellwanger",
"Ulrich",
""
],
[
"Teixeira",
"Ana M.",
""
]
] | In the presence of a light singlino-like LSP in the NMSSM, the missing transverse energy - MET - signature of squark/gluino production can be considerably reduced. Instead, a pair of Higgs bosons is produced in each event. We propose benchmark points for such scenarios, which differ in the squark and gluino masses, and in their decay cascades. Events for these points are simulated for the run II of the LHC at 13 TeV centre of mass energy. After cuts on the transverse momenta of at least four jets, and requiring two tau-leptons from one Higgs decay, we find that the invariant mass of two b-jets from the other Higgs decay shows clear peaks above the background. Despite the reduced MET, this search strategy allows to see signals for sufficiently large integrated luminosities, depending on the squark/gluino masses. |
hep-ph/0603120 | Zhenjun Xiao | Zhenjun Xiao, Fengying Li and Wenjuan Zou | B\to X_s\gamma, X_s l^+ l^- decays and constraints on the mass insertion
parameters in the MSSM | 16 pages, 5 eps figure files, typos removed | Commun.Theor.Phys.46:687-696,2006 | 10.1088/0253-6102/46/4/026 | NJNU-TH-2006-03 | hep-ph hep-ex | null | In this paper, we study the upper bounds on the mass insertion parameters
$(\delta^{q}_{AB})_{ij}$ in the minimal supersymmetric standard model (MSSM).
We found that the information from the measured branching ratio of $B \to X_s
l^+ l^-$ decay can help us to improve the upper bounds on the mass insertions
parameters $\left (\delta^{u,d}_{AB})_{3j,i3}$. Some regions allowed by the
data of $Br(B \to X_s \gamma) $ are excluded by the requirement of a SM-like
$C_{7\gamma}(m_b)$ imposed by the data of $Br(B \to X_s l^+ l^-)$.
| [
{
"created": "Thu, 16 Mar 2006 13:39:22 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Jun 2006 02:22:29 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Xiao",
"Zhenjun",
""
],
[
"Li",
"Fengying",
""
],
[
"Zou",
"Wenjuan",
""
]
] | In this paper, we study the upper bounds on the mass insertion parameters $(\delta^{q}_{AB})_{ij}$ in the minimal supersymmetric standard model (MSSM). We found that the information from the measured branching ratio of $B \to X_s l^+ l^-$ decay can help us to improve the upper bounds on the mass insertions parameters $\left (\delta^{u,d}_{AB})_{3j,i3}$. Some regions allowed by the data of $Br(B \to X_s \gamma) $ are excluded by the requirement of a SM-like $C_{7\gamma}(m_b)$ imposed by the data of $Br(B \to X_s l^+ l^-)$. |
hep-ph/0212080 | Frederic Pauquay | F. Pauquay | Infrared problems with dimensional regularisation at finite temperature | 16 pages, 3 figures | null | null | DAMTP-2002-153 | hep-ph | null | We address the question whether we have to perform the analytic continuation
to 4 space-time dimensions before or after the perturbative expansion has been
made. Using the simple model of large-N scalar field theory, we show how this
affects quantities like the thermal mass and the pressure, why the two
procedures give different results, and how this relates to the infrared
behaviour of the theory. We conclude that the correct procedure is to take the
limit d -> 4 before performing the perturbative expansion. Infrared divergences
arise if one makes the perturbative expansion before going to the physical
space-time dimension and they correspond to logarithms of the coupling in the
exact (nonperturbative or resummed) expression. Finally, we outline how this
may be relevant to the infrared problems encountered in thermal QCD.
| [
{
"created": "Thu, 5 Dec 2002 11:45:13 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Pauquay",
"F.",
""
]
] | We address the question whether we have to perform the analytic continuation to 4 space-time dimensions before or after the perturbative expansion has been made. Using the simple model of large-N scalar field theory, we show how this affects quantities like the thermal mass and the pressure, why the two procedures give different results, and how this relates to the infrared behaviour of the theory. We conclude that the correct procedure is to take the limit d -> 4 before performing the perturbative expansion. Infrared divergences arise if one makes the perturbative expansion before going to the physical space-time dimension and they correspond to logarithms of the coupling in the exact (nonperturbative or resummed) expression. Finally, we outline how this may be relevant to the infrared problems encountered in thermal QCD. |
hep-ph/0311218 | Stanley J. Brodsky | S. J. Brodsky, J. R. Hiller, D. S. Hwang, V. A. Karmanov | The covariant structure of light-front wave functions and the behavior
of hadronic form factors | LaTex, 29 pages | Phys.Rev.D69:076001,2004 | 10.1103/PhysRevD.69.076001 | SLAC-PUB-10068, JLAB-THY-03-35, UMN-D-03-4 | hep-ph | null | We study the analytic structure of light-front wave functions (LFWFs) and its
consequences for hadron form factors using an explicitly Lorentz-invariant
formulation of the front form. The normal to the light front is specified by a
general null vector $\omega^\mu.$ The LFWFs with definite total angular
momentum are eigenstates of a {\it kinematic} angular momentum operator and
satisfy all Lorentz symmetries. They are analytic functions of the invariant
mass squared of the constituents $M^2_0= (\sum k^\mu)^2$ and the light-cone
momentum fractions $x_i= {k_i\cd \omega / p \cd \omega}$ multiplied by
invariants constructed from the spin matrices, polarization vectors, and
$\omega^\mu.$ These properties are illustrated using known nonperturbative
eigensolutions of the Wick--Cutkosky model. We analyze the LFWFs introduced by
Chung and Coester to describe static and low momentum properties of the
nucleons. They correspond to the spin-locking of a quark with the spin of its
parent nucleon, together with a positive-energy projection constraint. These
extra constraints lead to anomalous dependence of form factors on $Q$ rather
than $Q^2.$ In contrast, the dependence of LFWFs on $M^2_0$ implies that hadron
form factors are analytic functions of $Q^2$ in agreement with dispersion
theory and perturbative QCD. We show that a model incorporating the
leading-twist perturbative QCD prediction is consistent with recent data for
the ratio of proton Pauli and Dirac form factors.
| [
{
"created": "Mon, 17 Nov 2003 22:05:32 GMT",
"version": "v1"
}
] | 2009-09-11 | [
[
"Brodsky",
"S. J.",
""
],
[
"Hiller",
"J. R.",
""
],
[
"Hwang",
"D. S.",
""
],
[
"Karmanov",
"V. A.",
""
]
] | We study the analytic structure of light-front wave functions (LFWFs) and its consequences for hadron form factors using an explicitly Lorentz-invariant formulation of the front form. The normal to the light front is specified by a general null vector $\omega^\mu.$ The LFWFs with definite total angular momentum are eigenstates of a {\it kinematic} angular momentum operator and satisfy all Lorentz symmetries. They are analytic functions of the invariant mass squared of the constituents $M^2_0= (\sum k^\mu)^2$ and the light-cone momentum fractions $x_i= {k_i\cd \omega / p \cd \omega}$ multiplied by invariants constructed from the spin matrices, polarization vectors, and $\omega^\mu.$ These properties are illustrated using known nonperturbative eigensolutions of the Wick--Cutkosky model. We analyze the LFWFs introduced by Chung and Coester to describe static and low momentum properties of the nucleons. They correspond to the spin-locking of a quark with the spin of its parent nucleon, together with a positive-energy projection constraint. These extra constraints lead to anomalous dependence of form factors on $Q$ rather than $Q^2.$ In contrast, the dependence of LFWFs on $M^2_0$ implies that hadron form factors are analytic functions of $Q^2$ in agreement with dispersion theory and perturbative QCD. We show that a model incorporating the leading-twist perturbative QCD prediction is consistent with recent data for the ratio of proton Pauli and Dirac form factors. |
hep-ph/9809508 | James M. Gelb | James M. Gelb and S. P. Rosen | Another Look at Just-So Solar Neutrino Oscillations | 3 pages, 3 figures; accepted as Phys Rev D, Rapid Communication. Name
change, trivial typographical changes. Remove the incorrect statement that
our results are inconsistent with model-independent analyses of solar
neutrino capture rates | Phys.Rev.D60:011301,1999 | 10.1103/PhysRevD.60.011301 | null | hep-ph | null | We take another look at ``Just-So'' solar neutrino oscillations,
characterizing them by the energy $E_{\pi/2}$ at which the distance-varying
angle is $\pi/2$, instead of the usual $\Delta m^2$. The rising spectrum
recently observed by SuperKamiokande is consistent with $E_{\pi/2}\sim$ 6-9 MeV
and marginally with 48 MeV. The pp neutrinos must then be reduced to one-half
the standard solar model prediction, and $^7$Be neutrinos must make up a
significant part of the SAGE and GALLEX gallium signal. For $E_{\pi/2}$ close
to 9 and 48 MeV, the $^7$Be neutrinos will also show a large seasonal
variation, emphasizing the importance of direct measurements of the $^7$Be
neutrinos.
| [
{
"created": "Wed, 23 Sep 1998 20:37:26 GMT",
"version": "v1"
},
{
"created": "Thu, 24 Dec 1998 12:59:23 GMT",
"version": "v2"
},
{
"created": "Thu, 1 Apr 1999 05:33:16 GMT",
"version": "v3"
}
] | 2010-01-06 | [
[
"Gelb",
"James M.",
""
],
[
"Rosen",
"S. P.",
""
]
] | We take another look at ``Just-So'' solar neutrino oscillations, characterizing them by the energy $E_{\pi/2}$ at which the distance-varying angle is $\pi/2$, instead of the usual $\Delta m^2$. The rising spectrum recently observed by SuperKamiokande is consistent with $E_{\pi/2}\sim$ 6-9 MeV and marginally with 48 MeV. The pp neutrinos must then be reduced to one-half the standard solar model prediction, and $^7$Be neutrinos must make up a significant part of the SAGE and GALLEX gallium signal. For $E_{\pi/2}$ close to 9 and 48 MeV, the $^7$Be neutrinos will also show a large seasonal variation, emphasizing the importance of direct measurements of the $^7$Be neutrinos. |
hep-ph/9911225 | Carlo Ewerz | Carlo Ewerz | New Representation for the 2-to-4 Gluon Vertex in High Energy QCD | 10 pages | Phys.Lett. B472 (2000) 135-142 | 10.1016/S0370-2693(99)01345-3 | Cavendish-HEP-99/10, DAMTP-1999-147 | hep-ph | null | A new representation for the two-to-four gluon vertex arising in the context
of unitarity corrections is derived which involves only BFKL kernels. We
discuss possible implications of this representation, including the possibility
of finding the NLO corrections to the vertex.
| [
{
"created": "Wed, 3 Nov 1999 18:29:43 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Ewerz",
"Carlo",
""
]
] | A new representation for the two-to-four gluon vertex arising in the context of unitarity corrections is derived which involves only BFKL kernels. We discuss possible implications of this representation, including the possibility of finding the NLO corrections to the vertex. |
1910.05051 | Ankit Beniwal | Ankit Beniwal (for the GAMBIT Collaboration) | Global study of effective Higgs portal dark matter models using GAMBIT | 8 pages, 4 figures. Contribution to the proceeding of EPS-HEP 2019
(10-17 July, Ghent, Belgium). Based on arXiv:1808.10465 | PoS(EPS-HEP2019)078 | null | CP3-19-46, gambit-proceedings-2019 | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this proceeding, we present frequentist and Bayesian results from a global
fit of effective vector and Majorana fermion Higgs portal dark matter (DM)
models using the $\mathsf{GAMBIT}$ software. We systematically explore the
parameter space of these models using advanced sampling techniques to
simultaneously satisfy the observed DM abundance, Higgs invisible decay, and
indirect and direct detection limits. In addition, we take account of a set of
nuisance parameters arising from Standard Model, nuclear physics, DM halo and
velocity distribution. For the vector DM model viable solutions are found at
low and high vector masses. The Majorana fermion model requires a strong
preference for a CP-odd, parity-violating coupling which leads to a
momentum-suppression of the DM-nucleon cross-section. All of our results,
samples and input files are publicly available via
$\href{https://www.zenodo.org/communities/gambit-official/}{\textsf{Zenodo}}$.
| [
{
"created": "Fri, 11 Oct 2019 09:47:28 GMT",
"version": "v1"
},
{
"created": "Fri, 31 Jul 2020 09:35:17 GMT",
"version": "v2"
}
] | 2020-08-03 | [
[
"Beniwal",
"Ankit",
"",
"for the GAMBIT Collaboration"
]
] | In this proceeding, we present frequentist and Bayesian results from a global fit of effective vector and Majorana fermion Higgs portal dark matter (DM) models using the $\mathsf{GAMBIT}$ software. We systematically explore the parameter space of these models using advanced sampling techniques to simultaneously satisfy the observed DM abundance, Higgs invisible decay, and indirect and direct detection limits. In addition, we take account of a set of nuisance parameters arising from Standard Model, nuclear physics, DM halo and velocity distribution. For the vector DM model viable solutions are found at low and high vector masses. The Majorana fermion model requires a strong preference for a CP-odd, parity-violating coupling which leads to a momentum-suppression of the DM-nucleon cross-section. All of our results, samples and input files are publicly available via $\href{https://www.zenodo.org/communities/gambit-official/}{\textsf{Zenodo}}$. |
hep-ph/0602062 | Amol Dighe | Amol Dighe (Tata Inst.), Srubabati Goswami (Harish-Chandra Res. Inst.
and Munich, Tech. U.) and Probir Roy (Tata Inst.) | Quark-lepton complementarity with quasidegenerate Majorana neutrinos | 4 pages, 2 eps figures, revtex4 format. Minor changes in text,
references added. Final version to be published in PRD, Rapid Communications | Phys.Rev. D73 (2006) 071301 | 10.1103/PhysRevD.73.071301 | TIFR/TH/05-33, TUM-HEP-627/06 | hep-ph | null | A basis independent formulation of quark-lepton complementarity is
implemented at a high scale for quasidegenerate Majorana neutrinos. It is shown
that even with the renormalization group evolution in the minimal
supersymmetric standard model, the scenario can be consistent with the data
provided a nontrivial role is played by the Majorana phases. Correlated
constraints are found on these phases and the neutrino mass scale using the
current data. We also indicate how future accurate measurements of the mixing
angles can serve as tests of this scenario and restrict the values of the
Majorana phases.
| [
{
"created": "Tue, 7 Feb 2006 15:24:10 GMT",
"version": "v1"
},
{
"created": "Mon, 17 Apr 2006 10:53:09 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Dighe",
"Amol",
"",
"Tata Inst."
],
[
"Goswami",
"Srubabati",
"",
"Harish-Chandra Res. Inst.\n and Munich, Tech. U."
],
[
"Roy",
"Probir",
"",
"Tata Inst."
]
] | A basis independent formulation of quark-lepton complementarity is implemented at a high scale for quasidegenerate Majorana neutrinos. It is shown that even with the renormalization group evolution in the minimal supersymmetric standard model, the scenario can be consistent with the data provided a nontrivial role is played by the Majorana phases. Correlated constraints are found on these phases and the neutrino mass scale using the current data. We also indicate how future accurate measurements of the mixing angles can serve as tests of this scenario and restrict the values of the Majorana phases. |
hep-ph/0101141 | Ilya Narodetskii | I.D'Souza, C.S. Kalman (Concordia University, Montreal), P.Yu.
Kulikov, I.M. Narodetskii (ITEP, Moscow) | The Kalman-Tran-D'Souza Model and the Semileptonic Decay Rates of Heavy
Baryons | 6 pages, latex, espcrc2.sty (included), 3 figures. The invited talk
presented by C.S.K. at the 4-th International Conference on Hyperons, Charm
and Beauty Hadrons, Valencia, June 27-30, 2000 | Nucl.Phys.Proc.Suppl.93:3-8,2001 | 10.1016/S0920-5632(00)01047-1 | null | hep-ph | null | We present an investigation of the inclusive semileptonic decay widths of the
heavy baryons Lambda_Q and Xi_Q, (Q=b,c) performed within a relativistic
constituent quark model, formulated on the light-front. In a way conceptually
similar to the deep-inelastic scattering case, the H_Q baryon inclusive width
is expressed as the integral of the free Q-quark partial width multiplied by a
bound-state factor related to the Q-quark distribution function in the H_Q. The
non-perturbative meson structure is described through the quark-model wave
functions, constructed via the Hamiltonian light-front formalism using as input
the Kalman-Tran-D'Souza equal time wave functions. A link between spectroscopic
quark models and the H_Q decay physics is obtained in this way. It is shown
that the bound-state effects and the Fermi motion of the b-quark remarkably
reduce the decay rate with respect to the free-quark result. Our predictions
for the BR(Lambda_c ->X_s e nu_e) and BR(Lambda_b->X_c e nu_e) decays are in
good agreement with existing data.
| [
{
"created": "Sat, 13 Jan 2001 15:49:18 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"D'Souza",
"I.",
"",
"Concordia University, Montreal"
],
[
"Kalman",
"C. S.",
"",
"Concordia University, Montreal"
],
[
"Kulikov",
"P. Yu.",
"",
"ITEP, Moscow"
],
[
"Narodetskii",
"I. M.",
"",
"ITEP, Moscow"
]
] | We present an investigation of the inclusive semileptonic decay widths of the heavy baryons Lambda_Q and Xi_Q, (Q=b,c) performed within a relativistic constituent quark model, formulated on the light-front. In a way conceptually similar to the deep-inelastic scattering case, the H_Q baryon inclusive width is expressed as the integral of the free Q-quark partial width multiplied by a bound-state factor related to the Q-quark distribution function in the H_Q. The non-perturbative meson structure is described through the quark-model wave functions, constructed via the Hamiltonian light-front formalism using as input the Kalman-Tran-D'Souza equal time wave functions. A link between spectroscopic quark models and the H_Q decay physics is obtained in this way. It is shown that the bound-state effects and the Fermi motion of the b-quark remarkably reduce the decay rate with respect to the free-quark result. Our predictions for the BR(Lambda_c ->X_s e nu_e) and BR(Lambda_b->X_c e nu_e) decays are in good agreement with existing data. |
hep-ph/9608366 | Andrzej Czarnecki | Andrzej Czarnecki and Johann H. K\"uhn | Nonfactorizable QCD and Electroweak Corrections to the Hadronic Z Boson
Decay Rate | 9 pages, Revtex | Phys.Rev.Lett. 77 (1996) 3955-3958 | 10.1103/PhysRevLett.77.3955 | TTP96-28 | hep-ph | null | We present an analysis of two-loop mixed QCD and electroweak corrections to
the decay of the Z boson into light quarks. We find that the naive
factorization of QCD and electroweak corrections does not describe correctly
the two-loop effects. The nonfactorizable corrections shift the width of the Z
boson by approximately -0.55(3) MeV and increase the central value of the
strong coupling constant determined at LEP by 0.001.
| [
{
"created": "Mon, 19 Aug 1996 14:52:58 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Nov 1997 23:58:35 GMT",
"version": "v2"
}
] | 2009-10-28 | [
[
"Czarnecki",
"Andrzej",
""
],
[
"Kühn",
"Johann H.",
""
]
] | We present an analysis of two-loop mixed QCD and electroweak corrections to the decay of the Z boson into light quarks. We find that the naive factorization of QCD and electroweak corrections does not describe correctly the two-loop effects. The nonfactorizable corrections shift the width of the Z boson by approximately -0.55(3) MeV and increase the central value of the strong coupling constant determined at LEP by 0.001. |
1301.7072 | Ariel Zhitnitsky | Ariel R. Zhitnitsky | QCD as a topologically ordered system | matches the published version | Annals of Physics 336 (2013), pp. 462-481 | 10.1016/j.aop.2013.05.020 | null | hep-ph cond-mat.str-el hep-lat hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We argue that QCD belongs to a topologically ordered phase similar to many
well-known condensed matter systems with a gap such as topological insulators
or superconductors. Our arguments are based on an analysis of the so-called
"deformed QCD" which is a weakly coupled gauge theory, but nevertheless
preserves all the crucial elements of strongly interacting QCD, including
confinement, nontrivial $\theta$ dependence, degeneracy of the topological
sectors, etc. Specifically, we construct the so-called topological "BF" action
which reproduces the well known infrared features of the theory such as
non-dispersive contribution to the topological susceptibility which can not be
associated with any propagating degrees of freedom. Furthermore, we interpret
the well known resolution of the celebrated $U(1)_A$ problem where the would be
$\eta'$ Goldstone boson generates its mass as a result of mixing of the
Goldstone field with a topological auxiliary field characterizing the system.
We then identify the non-propagating auxiliary topological field of the BF
formulation in deformed QCD with the Veneziano ghost (which plays the crucial
role in resolution of the $U(1)_A$ problem). Finally, we elaborate on relation
between "string -net" condensation in topologically ordered condensed matter
systems and long range coherent configurations, the "skeletons", studied in QCD
lattice simulations.
| [
{
"created": "Tue, 29 Jan 2013 21:01:03 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Feb 2013 21:02:02 GMT",
"version": "v2"
},
{
"created": "Mon, 1 Jul 2013 18:47:48 GMT",
"version": "v3"
}
] | 2013-07-02 | [
[
"Zhitnitsky",
"Ariel R.",
""
]
] | We argue that QCD belongs to a topologically ordered phase similar to many well-known condensed matter systems with a gap such as topological insulators or superconductors. Our arguments are based on an analysis of the so-called "deformed QCD" which is a weakly coupled gauge theory, but nevertheless preserves all the crucial elements of strongly interacting QCD, including confinement, nontrivial $\theta$ dependence, degeneracy of the topological sectors, etc. Specifically, we construct the so-called topological "BF" action which reproduces the well known infrared features of the theory such as non-dispersive contribution to the topological susceptibility which can not be associated with any propagating degrees of freedom. Furthermore, we interpret the well known resolution of the celebrated $U(1)_A$ problem where the would be $\eta'$ Goldstone boson generates its mass as a result of mixing of the Goldstone field with a topological auxiliary field characterizing the system. We then identify the non-propagating auxiliary topological field of the BF formulation in deformed QCD with the Veneziano ghost (which plays the crucial role in resolution of the $U(1)_A$ problem). Finally, we elaborate on relation between "string -net" condensation in topologically ordered condensed matter systems and long range coherent configurations, the "skeletons", studied in QCD lattice simulations. |
1106.3916 | Lei Wang | Lei Wang, Jin Min Yang | The LHC di-photon Higgs signal predicted by little Higgs models | 17 pages, 4 figures, 1 table | null | 10.1103/PhysRevD.84.075024 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Little Higgs theory naturally predicts a light Higgs boson whose most
important discovery channel at the LHC is the di-photon signal $pp\to h\to
\gamma\gamma$. In this work we perform a comparative study for this signal in
some typical little Higgs models, namely the littlest Higgs model (LH), two
littlest Higgs models with T-parity (named LHT-I and LHT-II) and the simplest
little Higgs modes (SLH). We find that compared with the Standard Model
prediction, the di-photon signal rate is always suppressed and the suppression
extent can be quite different for different models. The suppression is mild
($\lsim 10%$) in the LH model but can be quite severe ($\simeq 90%$) in other
three models. This means that discovering the light Higgs boson predicted by
the little Higgs theory through the di-photon channel at the LHC will be more
difficult than discovering the SM Higgs boson.
| [
{
"created": "Mon, 20 Jun 2011 14:27:02 GMT",
"version": "v1"
}
] | 2013-05-29 | [
[
"Wang",
"Lei",
""
],
[
"Yang",
"Jin Min",
""
]
] | Little Higgs theory naturally predicts a light Higgs boson whose most important discovery channel at the LHC is the di-photon signal $pp\to h\to \gamma\gamma$. In this work we perform a comparative study for this signal in some typical little Higgs models, namely the littlest Higgs model (LH), two littlest Higgs models with T-parity (named LHT-I and LHT-II) and the simplest little Higgs modes (SLH). We find that compared with the Standard Model prediction, the di-photon signal rate is always suppressed and the suppression extent can be quite different for different models. The suppression is mild ($\lsim 10%$) in the LH model but can be quite severe ($\simeq 90%$) in other three models. This means that discovering the light Higgs boson predicted by the little Higgs theory through the di-photon channel at the LHC will be more difficult than discovering the SM Higgs boson. |
1002.4794 | Alexander Lenz | M. Bobrowski, A. Lenz, J. Riedl and J. Rohrwild | How large can the SM contribution to CP violation in $D^0-\bar D^0$
mixing be? | 14 pages, considerably extended version of 0904.3971 with completely
new main aspect; text (except title and abstract) identical to the version
accepted by JHEP | JHEP 03(2010)009 | 10.1007/JHEP03(2010)009 | DO-TH 10/04,TTK-10-2 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the maximum size of CP violating effects in $D$-mixing within
the Standard Model (SM), using Heavy Quark Expansion (HQE) as theoretical
working tool. For this purpose we determine the leading HQE contributions and
also $\alpha_s$ corrections as well as subleading $1/m_c$ corrections to the
absorptive part of the mixing amplitude of neutral $D$ mesons. It turns out
that these contributions to $\Gamma_{12}$ do not vanish in the exact
SU$(3)_\mathrm{F}$ limit. Moreover, while the leading HQE terms give a result
for $\Gamma_{12}$ orders of magnitude lower than the current experimental
value, we do find a sizeable phase. In the literature it was suggested that
higher order terms in the HQE might be much less affected by the severe GIM
cancellations of the leading terms; it is even not excluded that these higher
order terms can reproduce the experimental value of $y$. If such an enhancement
is realized in nature, the phase discovered in the leading HQE terms can have a
sizeable effect. Therefore, we think that statements like: {\it "CP violating
effects in $D$-mixing of the order of $10^{-3}$ to $10^{-2}$ are an unambigous
sign of new physics"}--given our limited knowlegde of the SM prediction--are
premature. Finally, we give an example of a new physics model that can enhance
the leading HQE terms to $\Gamma_{12}$ by one to two orders of magnitude.
| [
{
"created": "Thu, 25 Feb 2010 14:27:00 GMT",
"version": "v1"
}
] | 2015-05-18 | [
[
"Bobrowski",
"M.",
""
],
[
"Lenz",
"A.",
""
],
[
"Riedl",
"J.",
""
],
[
"Rohrwild",
"J.",
""
]
] | We investigate the maximum size of CP violating effects in $D$-mixing within the Standard Model (SM), using Heavy Quark Expansion (HQE) as theoretical working tool. For this purpose we determine the leading HQE contributions and also $\alpha_s$ corrections as well as subleading $1/m_c$ corrections to the absorptive part of the mixing amplitude of neutral $D$ mesons. It turns out that these contributions to $\Gamma_{12}$ do not vanish in the exact SU$(3)_\mathrm{F}$ limit. Moreover, while the leading HQE terms give a result for $\Gamma_{12}$ orders of magnitude lower than the current experimental value, we do find a sizeable phase. In the literature it was suggested that higher order terms in the HQE might be much less affected by the severe GIM cancellations of the leading terms; it is even not excluded that these higher order terms can reproduce the experimental value of $y$. If such an enhancement is realized in nature, the phase discovered in the leading HQE terms can have a sizeable effect. Therefore, we think that statements like: {\it "CP violating effects in $D$-mixing of the order of $10^{-3}$ to $10^{-2}$ are an unambigous sign of new physics"}--given our limited knowlegde of the SM prediction--are premature. Finally, we give an example of a new physics model that can enhance the leading HQE terms to $\Gamma_{12}$ by one to two orders of magnitude. |
1708.08361 | Abhishek Dey | Jyotiranjan Beuria and Abhishek Dey | Exploring Charge and Color Breaking vacuum in Non-Holomorphic MSSM | 29 pages, 10 figures, Results section elaborated, conclusion
unchanged, published in JHEP | JHEP 10 (2017) 154 | 10.1007/JHEP10(2017)154 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Non-Holomorphic MSSM (NHSSM) shows various promising features that are not
easily obtained in MSSM. However, the additional Non-Holomorphic (NH) trilinear
interactions that attribute to the interesting phenomenological features, also
modify the effective scalar potential of the model significantly. We derive
analytic constraints involving trilinear parameters $A_t'$ and $A_b'$ that
exclude global charge and color breaking minima (CCB). Since the analytic
constraints are obtained considering specific directions in the
multi-dimensional field space, we further probe the applicability of these
constraints by exhaustive scan over NH parameter space with two different
regimes of $\tan\beta$ and delineate the nature of metastability by considering
vacuum expectation values for third generation squarks. We adhere to a natural
scenario by fixing Higgsino mass parameter ($\mu$) to a low value and estimate
the allowed ranges of NH trilinear parameters by considering vacuum stability
and observed properties of Higgs as the determining criteria.
| [
{
"created": "Mon, 28 Aug 2017 15:04:23 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Nov 2017 14:10:10 GMT",
"version": "v2"
}
] | 2017-11-15 | [
[
"Beuria",
"Jyotiranjan",
""
],
[
"Dey",
"Abhishek",
""
]
] | Non-Holomorphic MSSM (NHSSM) shows various promising features that are not easily obtained in MSSM. However, the additional Non-Holomorphic (NH) trilinear interactions that attribute to the interesting phenomenological features, also modify the effective scalar potential of the model significantly. We derive analytic constraints involving trilinear parameters $A_t'$ and $A_b'$ that exclude global charge and color breaking minima (CCB). Since the analytic constraints are obtained considering specific directions in the multi-dimensional field space, we further probe the applicability of these constraints by exhaustive scan over NH parameter space with two different regimes of $\tan\beta$ and delineate the nature of metastability by considering vacuum expectation values for third generation squarks. We adhere to a natural scenario by fixing Higgsino mass parameter ($\mu$) to a low value and estimate the allowed ranges of NH trilinear parameters by considering vacuum stability and observed properties of Higgs as the determining criteria. |
hep-ph/9809290 | Katya Christova | Ekaterina Christova | CP violating asymmetries of b quarks and leptons in e^+e^- \to t\bar t
and supersymmetry (review) | 27 pages Latex and 2 figures.ps, a paper written for the review
section of Int. J. of Mod. Phys. A, the title page and eqs. 44, 82
(previously 81) and 85 (previously 84) are changed, eq. 67 added, misprints
removed | Int.J.Mod.Phys. A14 (1999) 1-24 | 10.1142/S0217751X99002451 | INRNE-TH-98/33 | hep-ph | null | The distributions of the single decay b-quarks and leptons from e^+e^- \to
t\bar t assuming CP violation are reviewed. Different asymmetries, sensitive
independently to CP violation in the production and in the decay, and sensitive
to the real and imaginary parts of d^\gamma and d^Z are defined. The analytic
expressions are general and independent on the model of CP violation. In most
of them all phase space integrations are fulfilled analytically. Numerical
results in the MSSM with complex couplings are presented.
| [
{
"created": "Mon, 7 Sep 1998 16:35:25 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Oct 1998 15:24:24 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Christova",
"Ekaterina",
""
]
] | The distributions of the single decay b-quarks and leptons from e^+e^- \to t\bar t assuming CP violation are reviewed. Different asymmetries, sensitive independently to CP violation in the production and in the decay, and sensitive to the real and imaginary parts of d^\gamma and d^Z are defined. The analytic expressions are general and independent on the model of CP violation. In most of them all phase space integrations are fulfilled analytically. Numerical results in the MSSM with complex couplings are presented. |
hep-ph/0404280 | Vladimir Galkin | D. Ebert, R. N. Faustov, V. O. Galkin, A. P. Martynenko | Semileptonic decays of doubly heavy baryons in the relativistic quark
model | 20 pages, 5 figures | Phys.Rev.D70:014018,2004; Erratum-ibid.D77:079903,2008 | 10.1103/PhysRevD.70.014018 10.1103/PhysRevD.77.079903 | HU-EP-04/24 | hep-ph | null | Semileptonic decays of doubly heavy baryons are studied in the framework of
the relativistic quark model. The doubly heavy baryons are treated in the
quark-diquark approximation. The transition amplitudes of heavy diquarks bb and
bc going respectively to bc and cc are explicitly expressed through the overlap
integrals of the diquark wave functions in the whole accessible kinematic
range. The relativistic baryon wave functions of the quark-diquark bound system
are used for the calculation of the transition matrix elements, the Isgur-Wise
function and decay rates in the heavy quark limit.
| [
{
"created": "Fri, 30 Apr 2004 07:57:53 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Ebert",
"D.",
""
],
[
"Faustov",
"R. N.",
""
],
[
"Galkin",
"V. O.",
""
],
[
"Martynenko",
"A. P.",
""
]
] | Semileptonic decays of doubly heavy baryons are studied in the framework of the relativistic quark model. The doubly heavy baryons are treated in the quark-diquark approximation. The transition amplitudes of heavy diquarks bb and bc going respectively to bc and cc are explicitly expressed through the overlap integrals of the diquark wave functions in the whole accessible kinematic range. The relativistic baryon wave functions of the quark-diquark bound system are used for the calculation of the transition matrix elements, the Isgur-Wise function and decay rates in the heavy quark limit. |
1312.5325 | Prateek Agrawal | Prateek Agrawal and Vikram Rentala | Identifying dark matter interactions in monojet searches | 24 pages, 8 figures | null | 10.1007/JHEP05(2014)098 | FERMILAB-PUB-13-556-T, MSU-16122013 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the discrimination of quark-initiated jets from gluon-initiated jets
in monojet searches for dark matter using the technique of averaged jet energy
profiles. We demonstrate our results in the context of effective field theories
of dark matter interactions with quarks and gluons, but our methods apply more
generally to a wide class of models. Different effective theories of dark
matter and the standard model backgrounds each have a characteristic
quark/gluon fraction for the leading jet. When used in conjunction with the
traditional cut-and-count monojet search, the jet energy profile can be used to
set stronger bounds on contact interactions of dark matter. In the event of a
discovery of a monojet excess at the 14 TeV LHC, contact interactions between
dark matter with quarks or with gluons can be differentiated at the 95%
confidence level. For a given rate at the LHC, signal predictions at direct
detection experiments for different dark matter interactions can span five
orders of magnitude. The ability to identify these interactions allows us to
make a tighter connection between LHC searches and direct detection
experiments.
| [
{
"created": "Wed, 18 Dec 2013 21:00:11 GMT",
"version": "v1"
}
] | 2015-06-18 | [
[
"Agrawal",
"Prateek",
""
],
[
"Rentala",
"Vikram",
""
]
] | We study the discrimination of quark-initiated jets from gluon-initiated jets in monojet searches for dark matter using the technique of averaged jet energy profiles. We demonstrate our results in the context of effective field theories of dark matter interactions with quarks and gluons, but our methods apply more generally to a wide class of models. Different effective theories of dark matter and the standard model backgrounds each have a characteristic quark/gluon fraction for the leading jet. When used in conjunction with the traditional cut-and-count monojet search, the jet energy profile can be used to set stronger bounds on contact interactions of dark matter. In the event of a discovery of a monojet excess at the 14 TeV LHC, contact interactions between dark matter with quarks or with gluons can be differentiated at the 95% confidence level. For a given rate at the LHC, signal predictions at direct detection experiments for different dark matter interactions can span five orders of magnitude. The ability to identify these interactions allows us to make a tighter connection between LHC searches and direct detection experiments. |
2104.03542 | Jin-Lei Yang | Jin-Lei Yang, Hai-Bin Zhang, Chang-Xin Liu, Xing-Xing Dong, Tai-Fu
Feng | Muon $(g-2)$ in the B-LSSM | 22pages, 8figures | JHEP08(2021)086 | 10.1007/JHEP08(2021)086 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | The difference between the updated experimental result on the muon anomalous
magnetic dipole moment and the corresponding theoretical prediction of the
standard model on that is about $4.2$ standard deviations. In this work, we
calculate the muon anomalous MDM at the two-loop level in the supersymmetric
$B-L$ extension of the standard model. Considering the experimental constraints
on the lightest Higgs boson mass, Higgs boson decay modes $h\rightarrow
\gamma\gamma,\;WW,\;ZZ,\; b\bar b,\;\tau\bar\tau$, B rare decay $\bar
B\rightarrow X_s\gamma$, and the transition magnetic moments of Majorana
neutrinos, we analyze the theoretical predictions of the muon anomalous
magnetic dipole moment in the $B-L$ supersymmetric model. The numerical
analyses indicate that the tension between the experimental measurement and the
standard model prediction is remedied in the $B-L$ supersymmetric model.
| [
{
"created": "Thu, 8 Apr 2021 06:48:11 GMT",
"version": "v1"
},
{
"created": "Fri, 23 Apr 2021 01:58:23 GMT",
"version": "v2"
},
{
"created": "Mon, 7 Jun 2021 11:25:22 GMT",
"version": "v3"
},
{
"created": "Thu, 24 Jun 2021 08:48:55 GMT",
"version": "v4"
},
{
"cre... | 2021-08-31 | [
[
"Yang",
"Jin-Lei",
""
],
[
"Zhang",
"Hai-Bin",
""
],
[
"Liu",
"Chang-Xin",
""
],
[
"Dong",
"Xing-Xing",
""
],
[
"Feng",
"Tai-Fu",
""
]
] | The difference between the updated experimental result on the muon anomalous magnetic dipole moment and the corresponding theoretical prediction of the standard model on that is about $4.2$ standard deviations. In this work, we calculate the muon anomalous MDM at the two-loop level in the supersymmetric $B-L$ extension of the standard model. Considering the experimental constraints on the lightest Higgs boson mass, Higgs boson decay modes $h\rightarrow \gamma\gamma,\;WW,\;ZZ,\; b\bar b,\;\tau\bar\tau$, B rare decay $\bar B\rightarrow X_s\gamma$, and the transition magnetic moments of Majorana neutrinos, we analyze the theoretical predictions of the muon anomalous magnetic dipole moment in the $B-L$ supersymmetric model. The numerical analyses indicate that the tension between the experimental measurement and the standard model prediction is remedied in the $B-L$ supersymmetric model. |
1510.02332 | Lucian Harland-Lang | L. A. Harland-Lang, A. D. Martin, P. Motylinski, R.S. Thorne | Charm and beauty quark masses in the MMHT2014 global PDF analysis | 20 pages, 12 figures. Version accepted for publication in EPJC.
Please note certain LHAPDF files available prior to 4 December 2015 were not
formatted correctly | Eur. Phys. J. C (2016) 76:10 | 10.1140/epjc/s10052-015-3843-5 | LCTS/2015-30, IPPP/15/60, DCPT/15/120 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the variation in the MMHT2014 PDFs when we allow the heavy
quark masses $m_c$ and $m_b$ to vary away from their default values. We make
PDF sets available in steps of $\Delta m_c =0.05~{\rm GeV}$ and $\Delta m_b
=0.25~{\rm GeV}$, and present the variation in the PDFs and in the predictions.
We examine the comparison to the HERA data on charm and beauty structure
functions and note that in each case the heavy quark data, and the inclusive
data, have a slight preference for lower masses than our default values. We
provide PDF sets with 3 and 4 active quark flavours, as well as the standard
value of 5 flavours. We use the pole mass definition of the quark masses, as in
the default MMHT2014 analysis, but briefly comment on the $\overline{\rm MS}$
definition.
| [
{
"created": "Thu, 8 Oct 2015 14:13:33 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Jan 2016 11:22:14 GMT",
"version": "v2"
}
] | 2016-01-26 | [
[
"Harland-Lang",
"L. A.",
""
],
[
"Martin",
"A. D.",
""
],
[
"Motylinski",
"P.",
""
],
[
"Thorne",
"R. S.",
""
]
] | We investigate the variation in the MMHT2014 PDFs when we allow the heavy quark masses $m_c$ and $m_b$ to vary away from their default values. We make PDF sets available in steps of $\Delta m_c =0.05~{\rm GeV}$ and $\Delta m_b =0.25~{\rm GeV}$, and present the variation in the PDFs and in the predictions. We examine the comparison to the HERA data on charm and beauty structure functions and note that in each case the heavy quark data, and the inclusive data, have a slight preference for lower masses than our default values. We provide PDF sets with 3 and 4 active quark flavours, as well as the standard value of 5 flavours. We use the pole mass definition of the quark masses, as in the default MMHT2014 analysis, but briefly comment on the $\overline{\rm MS}$ definition. |
hep-ph/0111171 | Tao Huang | Tao Huang and Huifang Wu | A Phenomenological Analysis of Higher Fock State Contributions to the
$\chi_{cJ}$ Decays | null | null | 10.1088/0253-6102/36/5/573 | null | hep-ph | null | We present a phenomenological analysis of higher Fack state contributions to
the $\chi_{cJ}$ decays by using the recent BES experimental data. It is found
that the higher Fock state $\mid (c\bar{c})_{8}g>$ makes an important
contributions to the inclusive and exclusive processes with respect to that
from the valence Fock state $\mid c\bar{c} >$ of the $\chi_{cJ}$ and some
constraints of these contributions are obtained for the $\chi_{c0}$ and
$\chi_{c2}$ states in order to fit the experimental data.
| [
{
"created": "Wed, 14 Nov 2001 09:01:16 GMT",
"version": "v1"
}
] | 2018-01-17 | [
[
"Huang",
"Tao",
""
],
[
"Wu",
"Huifang",
""
]
] | We present a phenomenological analysis of higher Fack state contributions to the $\chi_{cJ}$ decays by using the recent BES experimental data. It is found that the higher Fock state $\mid (c\bar{c})_{8}g>$ makes an important contributions to the inclusive and exclusive processes with respect to that from the valence Fock state $\mid c\bar{c} >$ of the $\chi_{cJ}$ and some constraints of these contributions are obtained for the $\chi_{c0}$ and $\chi_{c2}$ states in order to fit the experimental data. |
0912.0674 | Oleg Antipin A | Oleg Antipin, Kimmo Tuominen | Constraints on Conformal Windows from Holographic Duals | Fig. 5b is corrected to match the discussion in the text | Mod.Phys.Lett.A26:2227-2246,2011 | 10.1142/S0217732311036747 | CP3-Origins-2009-25 | hep-ph hep-lat hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze a beta function with the analytic form of
Novikov-Shifman-Vainshtein-Zakharov result in the five dimensional
gravity-dilaton environment. We show how dilaton inherits poles and fixed
points of such beta function through the zeros and points of extremum in its
potential. Super Yang-Mills and supersymmetric QCD are studied in detail and
Seiberg's electric-magnetic duality in the dilaton potential is explicitly
demonstrated. Non-supersymmetric proposals of similar functional form are
tested and new insights into the conformal window as well as determinations of
scheme-independent value of the anomalous dimension at the fixed point are
presented.
| [
{
"created": "Thu, 3 Dec 2009 15:01:19 GMT",
"version": "v1"
},
{
"created": "Sat, 5 Dec 2009 13:02:12 GMT",
"version": "v2"
}
] | 2011-10-10 | [
[
"Antipin",
"Oleg",
""
],
[
"Tuominen",
"Kimmo",
""
]
] | We analyze a beta function with the analytic form of Novikov-Shifman-Vainshtein-Zakharov result in the five dimensional gravity-dilaton environment. We show how dilaton inherits poles and fixed points of such beta function through the zeros and points of extremum in its potential. Super Yang-Mills and supersymmetric QCD are studied in detail and Seiberg's electric-magnetic duality in the dilaton potential is explicitly demonstrated. Non-supersymmetric proposals of similar functional form are tested and new insights into the conformal window as well as determinations of scheme-independent value of the anomalous dimension at the fixed point are presented. |
1103.3708 | Daniel Green | Nathaniel Craig, Daniel Green, Andrey Katz | (De)Constructing a Natural and Flavorful Supersymmetric Standard Model | 36 pages, 4 figures ; v2: references added, expanded discussion of
FCNCs | null | 10.1007/JHEP07(2011)045 | UMD-PP-11-002, RUNHETC-2011-06 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using the framework of deconstruction, we construct simple, weakly-coupled
supersymmetric models that explain the Standard Model flavor hierarchy and
produce a flavorful soft spectrum compatible with precision limits. Electroweak
symmetry breaking is fully natural; the mu-term is dynamically generated with
no B mu-problem and the Higgs mass is easily raised above LEP limits without
reliance on large radiative corrections. These models possess the distinctive
spectrum of superpartners characteristic of "effective supersymmetry": the
third generation superpartners tend to be light, while the rest of the scalars
are heavy.
| [
{
"created": "Fri, 18 Mar 2011 20:01:25 GMT",
"version": "v1"
},
{
"created": "Fri, 29 Apr 2011 21:04:55 GMT",
"version": "v2"
}
] | 2015-05-27 | [
[
"Craig",
"Nathaniel",
""
],
[
"Green",
"Daniel",
""
],
[
"Katz",
"Andrey",
""
]
] | Using the framework of deconstruction, we construct simple, weakly-coupled supersymmetric models that explain the Standard Model flavor hierarchy and produce a flavorful soft spectrum compatible with precision limits. Electroweak symmetry breaking is fully natural; the mu-term is dynamically generated with no B mu-problem and the Higgs mass is easily raised above LEP limits without reliance on large radiative corrections. These models possess the distinctive spectrum of superpartners characteristic of "effective supersymmetry": the third generation superpartners tend to be light, while the rest of the scalars are heavy. |
1404.6082 | Jordy Vries de | W. Dekens, J. de Vries, J. Bsaisou, W. Bernreuther, C. Hanhart, Ulf-G.
Mei{\ss}ner, A. Nogga, A. Wirzba | Unraveling models of CP violation through electric dipole moments of
light nuclei | Published version | JHEP 07 (2014) 069 | 10.1007/JHEP07(2014)069 | null | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the proposed measurements of the electric dipole moments of
light nuclei in storage rings would put strong constraints on models of
flavor-diagonal CP violation. Our analysis is exemplified by a comparison of
the Standard Model including the QCD theta term, the minimal left-right
symmetric model, a specific version of the so-called aligned two-Higgs doublet
model, and briefly the minimal supersymmetric extension of the Standard Model.
By using effective field theory techniques we demonstrate to what extend
measurements of the electric dipole moments of the nucleons, the deuteron, and
helion could discriminate between these scenarios. We discuss how measurements
of electric dipole moments of other systems relate to the light-nuclear
measurements.
| [
{
"created": "Thu, 24 Apr 2014 10:47:57 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Jul 2014 11:22:40 GMT",
"version": "v2"
}
] | 2014-07-22 | [
[
"Dekens",
"W.",
""
],
[
"de Vries",
"J.",
""
],
[
"Bsaisou",
"J.",
""
],
[
"Bernreuther",
"W.",
""
],
[
"Hanhart",
"C.",
""
],
[
"Meißner",
"Ulf-G.",
""
],
[
"Nogga",
"A.",
""
],
[
"Wirzba",
"A.... | We show that the proposed measurements of the electric dipole moments of light nuclei in storage rings would put strong constraints on models of flavor-diagonal CP violation. Our analysis is exemplified by a comparison of the Standard Model including the QCD theta term, the minimal left-right symmetric model, a specific version of the so-called aligned two-Higgs doublet model, and briefly the minimal supersymmetric extension of the Standard Model. By using effective field theory techniques we demonstrate to what extend measurements of the electric dipole moments of the nucleons, the deuteron, and helion could discriminate between these scenarios. We discuss how measurements of electric dipole moments of other systems relate to the light-nuclear measurements. |
hep-ph/0403230 | Max Metlitski A. | Kirk B. W. Buckley, Max A. Metlitski, and Ariel R. Zhitnitsky
(University of British Columbia) | Vortices and type-I superconductivity in neutron stars | 10 pages, 1 figure | Phys.Rev. C69 (2004) 055803 | 10.1103/PhysRevC.69.055803 | null | hep-ph astro-ph nucl-th | null | In a recent paper by Link, it was pointed out that the the standard picture
of the neutron star core, composed of a mixture of a neutron superfluid and a
proton type-II superconductor, is inconsistent with observations of long period
precession in isolated pulsars. In the following we will show that intervortex
force between the magnetic flux tubes may be attractive resulting in a type-I
(rather than type-II) superconductor. In this case the magnetic field cannot
exist in the form of magnetic flux tubes, supporting Link's observation. This
behavior of the system is due to the strong interaction between the
proton-neutron Cooper pairs, which was previously ignored. We also calculate
the critical magnetic fields H_c and H_c2 for type-I/II superconductors. These
results also support our claim of type-I superconductivity in the cores of
neutron stars.
| [
{
"created": "Mon, 22 Mar 2004 04:49:46 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Buckley",
"Kirk B. W.",
"",
"University of British Columbia"
],
[
"Metlitski",
"Max A.",
"",
"University of British Columbia"
],
[
"Zhitnitsky",
"Ariel R.",
"",
"University of British Columbia"
]
] | In a recent paper by Link, it was pointed out that the the standard picture of the neutron star core, composed of a mixture of a neutron superfluid and a proton type-II superconductor, is inconsistent with observations of long period precession in isolated pulsars. In the following we will show that intervortex force between the magnetic flux tubes may be attractive resulting in a type-I (rather than type-II) superconductor. In this case the magnetic field cannot exist in the form of magnetic flux tubes, supporting Link's observation. This behavior of the system is due to the strong interaction between the proton-neutron Cooper pairs, which was previously ignored. We also calculate the critical magnetic fields H_c and H_c2 for type-I/II superconductors. These results also support our claim of type-I superconductivity in the cores of neutron stars. |
2108.04099 | Aron Mees Van Kampen | Aron Mees van Kampen | Drell-Yan transverse spectra at the LHC: a comparison of parton
branching and analytical resummation approaches | 7 pages, 1 figure, Submission to SciPost. Contribution at the XXVIII
International Workshop on Deep-Inelastic Scattering and Related Subjects | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I report on precision comparisons of theoretical predictions for Drell-Yan
(DY) transverse momentum spectra from two approaches: the analytical
resummation approach based on Collins-Soper-Sterman (CSS) formalism and the
parton branching (PB) approach to the evolution of transverse momentum
dependent (TMD) parton distributions.
| [
{
"created": "Mon, 9 Aug 2021 14:57:40 GMT",
"version": "v1"
}
] | 2021-08-10 | [
[
"van Kampen",
"Aron Mees",
""
]
] | I report on precision comparisons of theoretical predictions for Drell-Yan (DY) transverse momentum spectra from two approaches: the analytical resummation approach based on Collins-Soper-Sterman (CSS) formalism and the parton branching (PB) approach to the evolution of transverse momentum dependent (TMD) parton distributions. |
hep-ph/9912528 | Alan Kostelecky | Alan Kostelecky | Lorentz- and CPT-violating extension of the standard model | 13 pages, invited talk at the conference `Beyond the Standard Model,'
Tegernsee, Germany, June 1999 | null | null | IUNET 413, August 1999 | hep-ph | null | The formulation and some experimental implications of a general
Lorentz-violating extension of the standard model are reviewed. The theory
incorporates both CPT-preserving and CPT-breaking terms. It is otherwise a
conventional quantum field theory, obtained under the assumption that Lorentz
symmetry is spontaneously broken in an underlying model. The theory contains
the usual standard-model gauge structure, and it is power-counting
renormalizable. Energy and momentum are conserved. Despite the violation of
Lorentz symmetry, the theory exhibits covariance under Lorentz transformations
of the observer inertial frame. A general Lorentz-violating extension of
quantum electrodynamics can be extracted. The standard-model extension implies
potentially observable effects in a wide variety of experiments, including
among others measurements on neutral-meson oscillations, comparative studies in
Penning traps, spectroscopy of hydrogen and antihydrogen, bounds on
cosmological birefringence, measurements of muon properties, clock-comparison
tests, and observations of the baryon asymmetry.
| [
{
"created": "Tue, 28 Dec 1999 19:48:09 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kostelecky",
"Alan",
""
]
] | The formulation and some experimental implications of a general Lorentz-violating extension of the standard model are reviewed. The theory incorporates both CPT-preserving and CPT-breaking terms. It is otherwise a conventional quantum field theory, obtained under the assumption that Lorentz symmetry is spontaneously broken in an underlying model. The theory contains the usual standard-model gauge structure, and it is power-counting renormalizable. Energy and momentum are conserved. Despite the violation of Lorentz symmetry, the theory exhibits covariance under Lorentz transformations of the observer inertial frame. A general Lorentz-violating extension of quantum electrodynamics can be extracted. The standard-model extension implies potentially observable effects in a wide variety of experiments, including among others measurements on neutral-meson oscillations, comparative studies in Penning traps, spectroscopy of hydrogen and antihydrogen, bounds on cosmological birefringence, measurements of muon properties, clock-comparison tests, and observations of the baryon asymmetry. |
hep-ph/0204143 | Pavol Domin | P. Domin, F. Simkovic, S. V. Semenov, Yu. V. Gaponov | Phenomenological Study of Solar-Neutrino Induced Double Beta Decay of
Mo100 | 8 pages, LaTeX, 2 postscript figures, Talk presented by P. Domin on
the workshop MEDEX'01 (Prague, June, 2001), to appear in Czech. J. Phys. 52
(2002) | Czech.J.Phys. 52 (2002) 451 | 10.1023/A:1015344907452 | null | hep-ph | null | The detection of solar-neutrinos of different origin via induced beta beta
process of Mo100 is investigated. The particular counting rates and energy
distributions of emitted electrons are presented. A discussion in respect to
solar-neutrino detector consisting of 10 tones of Mo100 is included. Both the
cases of the standard solar model and neutrino oscillation scenarios are
analyzed. Moreover, new beta^- beta^+ and beta^-/EC channels of the double-beta
process are introduced and possibilities of their experimental observation are
addressed.
| [
{
"created": "Fri, 12 Apr 2002 18:41:56 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Domin",
"P.",
""
],
[
"Simkovic",
"F.",
""
],
[
"Semenov",
"S. V.",
""
],
[
"Gaponov",
"Yu. V.",
""
]
] | The detection of solar-neutrinos of different origin via induced beta beta process of Mo100 is investigated. The particular counting rates and energy distributions of emitted electrons are presented. A discussion in respect to solar-neutrino detector consisting of 10 tones of Mo100 is included. Both the cases of the standard solar model and neutrino oscillation scenarios are analyzed. Moreover, new beta^- beta^+ and beta^-/EC channels of the double-beta process are introduced and possibilities of their experimental observation are addressed. |
hep-ph/9802331 | Tatsuo Kobayashi | Yoshiharu Kawamura, Tatsuo Kobayashi and Manabu Watanabe | Bottom-up approach to B-parameter in minimal supersymmetric standard
model | 35 pages, latex, 13 figures | Int.J.Mod.Phys.A15:81-104,2000 | 10.1142/S0217751X00000057 | HIP-1998-04/TH, TUM-HEP-306/98, DPSU-98-1 | hep-ph hep-th | null | We study $\mu$ and $B$-parameters in the minimal supersymmetric standard
model (MSSM) based on the radiative electroweak symmetry breaking scenario
using $\lq\lq$bottom-up" approach and show how useful our approach is to select
a phenomenologically viable model beyond the MSSM under the assumption that the
underlying theory is a string model or a gauge-Yukawa unified gauge model.
| [
{
"created": "Mon, 16 Feb 1998 09:31:44 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Kawamura",
"Yoshiharu",
""
],
[
"Kobayashi",
"Tatsuo",
""
],
[
"Watanabe",
"Manabu",
""
]
] | We study $\mu$ and $B$-parameters in the minimal supersymmetric standard model (MSSM) based on the radiative electroweak symmetry breaking scenario using $\lq\lq$bottom-up" approach and show how useful our approach is to select a phenomenologically viable model beyond the MSSM under the assumption that the underlying theory is a string model or a gauge-Yukawa unified gauge model. |
hep-ph/9505333 | Yoshio Koide | Yoshio Koide and Morimitu Tanimoto | U(3)-Family Nonet Higgs Boson and its Phenomenology | 31 pages, LaTex with figure | Z.Phys.C72:333-344,1996 | 10.1007/s002880050253 | US-95-04 & EHU-95-03 | hep-ph | null | In a model where quark and lepton masses and family-mixings are caused not by
a variety of Yukawa couplings $y_{ij}$ ($i,j=1,2,3$: family indices) with one
vacuum expectation value (VEV) $v=\langle\phi_L^0\rangle_0$, but by a variety
of VEV's of a U(3)-family nonet Higgs boson $\phi_L$, $v_{i}^j=\langle\phi_{L
i}^{0j}\rangle_0$, with a single coupling constant, the following problems are
investigated: what constraints on the Higgs potential are imposed in order to
provide realistic quark and lepton mass spectra and mixings and what
constraints on the Higgs boson masses are required in order to suppress
unwelcome flavor-changing neutral current effects. Lower bounds of the physical
Higgs boson masses of $\phi_L$ are deduced from the present experimental data
and new physics from the present scenario is speculated.
| [
{
"created": "Thu, 18 May 1995 13:16:19 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Jan 1996 09:46:18 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Koide",
"Yoshio",
""
],
[
"Tanimoto",
"Morimitu",
""
]
] | In a model where quark and lepton masses and family-mixings are caused not by a variety of Yukawa couplings $y_{ij}$ ($i,j=1,2,3$: family indices) with one vacuum expectation value (VEV) $v=\langle\phi_L^0\rangle_0$, but by a variety of VEV's of a U(3)-family nonet Higgs boson $\phi_L$, $v_{i}^j=\langle\phi_{L i}^{0j}\rangle_0$, with a single coupling constant, the following problems are investigated: what constraints on the Higgs potential are imposed in order to provide realistic quark and lepton mass spectra and mixings and what constraints on the Higgs boson masses are required in order to suppress unwelcome flavor-changing neutral current effects. Lower bounds of the physical Higgs boson masses of $\phi_L$ are deduced from the present experimental data and new physics from the present scenario is speculated. |
hep-ph/0208025 | Tom Steele | M.R. Ahmady, F.A. Chishtie, V. Elias, A.H. Fariborz, D.G.C. McKeon,
T.N. Sherry, A. Squires, T.G. Steele | Optimal Renormalization-Group Improvement of the Perturbative Series for
the e^+ e^- -Annihilation Cross-Section | 7 pages, revtex, 3 eps figures embedded in manuscript. Revised
version includes additional references and corrects equation (16) | Phys.Rev. D67 (2003) 034017 | 10.1103/PhysRevD.67.034017 | null | hep-ph | null | Using renormalization-group methods, we derive differential equations for the
all-orders summation of logarithmic corrections to the QCD series for R(s) =
sigma(e^+ e^- --> hadrons)/sigma(e^+ e^- --> mu^+ mu^-), as obtained from the
imaginary part of the purely-perturbative vector-current correlation function.
We present explicit solutions for the summation of leading and up to three
subsequent subleading orders of logarithms. The summations accessible from the
four-loop vector-correlator not only lead to a substantial reduction in
sensitivity to the renormalization scale, but necessarily impose a common
infrared bound on perturbative approximations to R(s), regardless of the
infrared behaviour of the true QCD couplant.
| [
{
"created": "Fri, 2 Aug 2002 16:35:26 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Aug 2002 14:59:05 GMT",
"version": "v2"
},
{
"created": "Sun, 5 Jan 2003 18:23:45 GMT",
"version": "v3"
}
] | 2009-11-07 | [
[
"Ahmady",
"M. R.",
""
],
[
"Chishtie",
"F. A.",
""
],
[
"Elias",
"V.",
""
],
[
"Fariborz",
"A. H.",
""
],
[
"McKeon",
"D. G. C.",
""
],
[
"Sherry",
"T. N.",
""
],
[
"Squires",
"A.",
""
],
[
"Steele"... | Using renormalization-group methods, we derive differential equations for the all-orders summation of logarithmic corrections to the QCD series for R(s) = sigma(e^+ e^- --> hadrons)/sigma(e^+ e^- --> mu^+ mu^-), as obtained from the imaginary part of the purely-perturbative vector-current correlation function. We present explicit solutions for the summation of leading and up to three subsequent subleading orders of logarithms. The summations accessible from the four-loop vector-correlator not only lead to a substantial reduction in sensitivity to the renormalization scale, but necessarily impose a common infrared bound on perturbative approximations to R(s), regardless of the infrared behaviour of the true QCD couplant. |
1005.4550 | Yong-Jun Zhang | Yong-Jun Zhang, Bin Zhang | Proton Sea Quark Flavour Asymmetry and Roper Resonance | null | null | 10.1088/1674-1137/36/3/001 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the proton and the Roper resonance together with the meson cloud
model, by constructing a Hamiltonian matrix and solving the eigenvalue
equation. The proton sea quark flavour asymmetry and some properties of the
Roper resonance are thus reproduced in one scheme.
| [
{
"created": "Tue, 25 May 2010 12:32:54 GMT",
"version": "v1"
},
{
"created": "Fri, 16 Dec 2011 06:55:19 GMT",
"version": "v2"
}
] | 2015-05-19 | [
[
"Zhang",
"Yong-Jun",
""
],
[
"Zhang",
"Bin",
""
]
] | We study the proton and the Roper resonance together with the meson cloud model, by constructing a Hamiltonian matrix and solving the eigenvalue equation. The proton sea quark flavour asymmetry and some properties of the Roper resonance are thus reproduced in one scheme. |
1907.12060 | Margarete Muhlleitner | Julien Baglio, Thi Nhung Dao, Margarete Muhlleitner | One-Loop Corrections to the Two-Body Decays of the Neutral Higgs Bosons
in the Complex NMSSM | 59 pages, 24 figures | null | 10.1140/epjc/s10052-020-08520-8 | IFIRSE-TH-2019-3, KA-TP-15-2019 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Since no direct signs of new physics have been observed so far indirect
searches in the Higgs sector have become increasingly important. With the
discovered Higgs boson behaving very Standard Model (SM)-like, however,
indirect new physics manifestations are in general expected to be small. On the
theory side, this makes precision predictions for the Higgs parameters and
observables indispensable. In this paper, we provide in the framework of the
CP-violating Next-to-Minimal Supersymmetric extension of the SM (NMSSM) the
complete next-to-leading order (SUSY-)electroweak corrections to the
neutralHiggs boson decays that are on-shell and non-loop induced. Together with
the also provided SUSY-QCD corrections to colored final states, they are
implemented in the Fortran code NMSSMCALC which already includes the
state-of-the art QCD corrections. The new code is called NMSSMCALCEW. This way
we provide the NMSSM Higgs boson decays and branching ratios at presently
highest possible precision and thereby contribute to the endeavor of searching
for New Physics at present and future colliders.
| [
{
"created": "Sun, 28 Jul 2019 09:59:48 GMT",
"version": "v1"
}
] | 2020-12-02 | [
[
"Baglio",
"Julien",
""
],
[
"Dao",
"Thi Nhung",
""
],
[
"Muhlleitner",
"Margarete",
""
]
] | Since no direct signs of new physics have been observed so far indirect searches in the Higgs sector have become increasingly important. With the discovered Higgs boson behaving very Standard Model (SM)-like, however, indirect new physics manifestations are in general expected to be small. On the theory side, this makes precision predictions for the Higgs parameters and observables indispensable. In this paper, we provide in the framework of the CP-violating Next-to-Minimal Supersymmetric extension of the SM (NMSSM) the complete next-to-leading order (SUSY-)electroweak corrections to the neutralHiggs boson decays that are on-shell and non-loop induced. Together with the also provided SUSY-QCD corrections to colored final states, they are implemented in the Fortran code NMSSMCALC which already includes the state-of-the art QCD corrections. The new code is called NMSSMCALCEW. This way we provide the NMSSM Higgs boson decays and branching ratios at presently highest possible precision and thereby contribute to the endeavor of searching for New Physics at present and future colliders. |
hep-ph/0003215 | Deog Ki Hong | Deog Ki Hong | Color Superconductivity in High Density Effective Theory | 13 pages, no figures, latex, contribution to TMU-Yale Symposium on
Dynamics of Gauge Fields - an external activity of APCTP | null | null | null | hep-ph | null | In this talk, I discuss the recent development in color superconductivity in
terms of effective field theory. By investigating the Cooper pair gap equations
at high density, we see that the effective theory simplifies the gap analysis
very much, especially in finding the ground state, the precise form of the gap,
and the critical temperature. Furthermore, the effective theory enables us to
estimate the critical density for color superconductivity, which is found to be
around $230~{\rm MeV}$ in the hard-dense-loop approximation. Finally, I briefly
mention the low-lying spectra of color superconductor at high density.
| [
{
"created": "Wed, 22 Mar 2000 07:35:46 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Hong",
"Deog Ki",
""
]
] | In this talk, I discuss the recent development in color superconductivity in terms of effective field theory. By investigating the Cooper pair gap equations at high density, we see that the effective theory simplifies the gap analysis very much, especially in finding the ground state, the precise form of the gap, and the critical temperature. Furthermore, the effective theory enables us to estimate the critical density for color superconductivity, which is found to be around $230~{\rm MeV}$ in the hard-dense-loop approximation. Finally, I briefly mention the low-lying spectra of color superconductor at high density. |
1903.11087 | Massimiliano Procura | Ankita Budhraja, Ambar Jain, Massimiliano Procura | One-loop Angularity Distributions with Recoil using Soft-Collinear
Effective Theory | 45 pages, 7 figures, v2: improved discussion, version accepted for
publication in JHEP | null | 10.1007/JHEP08(2019)144 | UWThPh 2019-5 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Angularities are event shapes whose sensitivity to the splitting angle of a
collinear emission is controlled by a continuous parameter $b$, with $ -1 < b <
\infty$. When measured with respect to the thrust axis, this class of QCD
observables includes thrust ($b=1$) and jet broadening ($b=0$), the former
being insensitive to the recoil of soft against collinear radiation, while the
latter being maximally sensitive to it. Presently available analytic results
for angularity distributions with $b \neq 0$ can be applied only close to the
thrust limit since recoil effects have so far been neglected. As a first step
to establish a comprehensive theoretical framework based on Soft-Collinear
Effective Theory valid for all recoil-sensitive angularities, we compute for
the first time angularity distributions at one-loop order in $\alpha_s$ for all
values of $b$ taking into account recoil effects. In the differential cross
section, these amount to novel sub-leading singular contributions and/or power
corrections, where the former are characterized by fractional powers of the
angularity and contribute appreciably close to the peak region, also for $b
\gtrsim 0.5$. Our calculations are checked against various limits known in the
literature and agree with the numerical output of the Event2 generator.
| [
{
"created": "Tue, 26 Mar 2019 18:00:11 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Jun 2020 08:05:07 GMT",
"version": "v2"
}
] | 2020-06-10 | [
[
"Budhraja",
"Ankita",
""
],
[
"Jain",
"Ambar",
""
],
[
"Procura",
"Massimiliano",
""
]
] | Angularities are event shapes whose sensitivity to the splitting angle of a collinear emission is controlled by a continuous parameter $b$, with $ -1 < b < \infty$. When measured with respect to the thrust axis, this class of QCD observables includes thrust ($b=1$) and jet broadening ($b=0$), the former being insensitive to the recoil of soft against collinear radiation, while the latter being maximally sensitive to it. Presently available analytic results for angularity distributions with $b \neq 0$ can be applied only close to the thrust limit since recoil effects have so far been neglected. As a first step to establish a comprehensive theoretical framework based on Soft-Collinear Effective Theory valid for all recoil-sensitive angularities, we compute for the first time angularity distributions at one-loop order in $\alpha_s$ for all values of $b$ taking into account recoil effects. In the differential cross section, these amount to novel sub-leading singular contributions and/or power corrections, where the former are characterized by fractional powers of the angularity and contribute appreciably close to the peak region, also for $b \gtrsim 0.5$. Our calculations are checked against various limits known in the literature and agree with the numerical output of the Event2 generator. |
1006.4636 | Christiana Athanasiou | Christiana Athanasiou, Krishna Rajagopal and Misha Stephanov | Using Higher Moments of Fluctuations and their Ratios in the Search for
the QCD Critical Point | 16 pages, 5 figures. Version to appear in PRD. Footnote and reference
added | Phys.Rev.D82:074008,2010 | 10.1103/PhysRevD.82.074008 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The QCD critical point can be found in heavy ion collision experiments via
the non-monotonic behavior of many fluctuation observables as a function of the
collision energy. The event-by-event fluctuations of various particle
multiplicities are enhanced in those collisions that freeze out near the
critical point. Higher, non-Gaussian, moments of the event-by-event
distributions of such observables are particularly sensitive to critical
fluctuations, since their magnitude depends on the critical correlation length
to a high power. We present quantitative estimates of the contribution of
critical fluctuations to the third and fourth moments of the pion, proton and
net proton multiplicities, as well as estimates of various measures of
pion-proton correlations, all as a function of the same five non-universal
parameters, one of which is the correlation length that parametrizes proximity
to the critical point. We show how to use nontrivial but parameter independent
ratios among these more than a dozen fluctuation observables to discover the
critical point. We also construct ratios that, if the critical point is found,
can be used to overconstrain the values of the non-universal parameters.
| [
{
"created": "Wed, 23 Jun 2010 20:03:54 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Sep 2010 15:30:48 GMT",
"version": "v2"
}
] | 2014-11-21 | [
[
"Athanasiou",
"Christiana",
""
],
[
"Rajagopal",
"Krishna",
""
],
[
"Stephanov",
"Misha",
""
]
] | The QCD critical point can be found in heavy ion collision experiments via the non-monotonic behavior of many fluctuation observables as a function of the collision energy. The event-by-event fluctuations of various particle multiplicities are enhanced in those collisions that freeze out near the critical point. Higher, non-Gaussian, moments of the event-by-event distributions of such observables are particularly sensitive to critical fluctuations, since their magnitude depends on the critical correlation length to a high power. We present quantitative estimates of the contribution of critical fluctuations to the third and fourth moments of the pion, proton and net proton multiplicities, as well as estimates of various measures of pion-proton correlations, all as a function of the same five non-universal parameters, one of which is the correlation length that parametrizes proximity to the critical point. We show how to use nontrivial but parameter independent ratios among these more than a dozen fluctuation observables to discover the critical point. We also construct ratios that, if the critical point is found, can be used to overconstrain the values of the non-universal parameters. |
hep-ph/0610345 | Kristian McDonald | A. Coulthurst, K. L. McDonald and B. H. J. McKellar | Suppressing Proton Decay By Separating Quarks And Leptons | 4 pages, references added to match published version | Phys.Rev.D74:127701,2006 | 10.1103/PhysRevD.74.127701 | null | hep-ph | null | Arkani-Hamed and Schmaltz (AS) have shown that proton stability need not
originate from symmetries in a high energy theory. Instead the proton decay
rate is suppressed if quarks and leptons are spatially separated in a compact
extra dimension. This separation may be achieved by coupling five dimensional
fermions to a bulk scalar field with a non-trivial vacuum profile and requires
relationships between the associated quark and lepton Yukawa couplings. We
hypothesise that these relationships are the manifestation of an underlying
symmetry. We further show that the AS proposal may suggest that proton
stability \emph{is} the result of an underlying symmetry, though not
necessarily the traditional baryon number symmetry.
| [
{
"created": "Thu, 26 Oct 2006 06:36:42 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Feb 2007 00:09:13 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Coulthurst",
"A.",
""
],
[
"McDonald",
"K. L.",
""
],
[
"McKellar",
"B. H. J.",
""
]
] | Arkani-Hamed and Schmaltz (AS) have shown that proton stability need not originate from symmetries in a high energy theory. Instead the proton decay rate is suppressed if quarks and leptons are spatially separated in a compact extra dimension. This separation may be achieved by coupling five dimensional fermions to a bulk scalar field with a non-trivial vacuum profile and requires relationships between the associated quark and lepton Yukawa couplings. We hypothesise that these relationships are the manifestation of an underlying symmetry. We further show that the AS proposal may suggest that proton stability \emph{is} the result of an underlying symmetry, though not necessarily the traditional baryon number symmetry. |
2204.11606 | Mohammed Maher Abdelrahim Mohammed | Mohammed Maher Abdelrahim Mohammed | Hunting stabilization effects of the high-energy resummation at the LHC | 92 pages, 30 figures, PhD thesis | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Studying semi-hard processes in the large center-of-mass energy limit gives
us an opportunity to further test perturbative QCD in an unexplored kinematical
configuration, contributing to a better understanding of the dynamics of strong
interactions. For semi-hard reactions in kinematics at large center-of-mass
energy $\sqrt{s}$, the BFKL resummation of energy logarithms comes into play,
since large energy logarithms compensate the smallness of QCD coupling
$\alpha_s$ and must therefore be accounted for to all perturbative orders.
Tracing the path toward performing precision calculations via BFKL resummation
of high-energy logarithms, in this thesis we present phenomenological analyses
for distinct inclusive processes, highlighting the recognized problem of
instabilities under higher-order corrections and energy-scales variations, that
would abort any possibility to investigate semi-hard reactions with
high-precision at natural energy-scales. At the same time, we present new
reactions that seem to act as fair stabilizers of the high-energy series.
First, the inclusive production at the LHC of a charged light hadron and of a
jet, featuring a wide separation in rapidity, is presented making use of
optimization methods to fix energy-scale. We report some predictions, tailored
on the CMS and CASTOR acceptances. Then, we propose as a novel probe channel
for the manifestation of the BFKL dynamics, the inclusive hadroproduction of a
Higgs boson and of a jet, featuring large transverse momenta and well separated
in rapidity. Finlay, we propose the inclusive semi-hard production of two
bottom-flavored hadrons, as well as of a single bottom-flavored hadron
accompanied by a light jet, as novel channels for targeting stabilization
effects of the high-energy resummation under higher-order corrections.
| [
{
"created": "Mon, 25 Apr 2022 12:38:59 GMT",
"version": "v1"
}
] | 2022-04-26 | [
[
"Mohammed",
"Mohammed Maher Abdelrahim",
""
]
] | Studying semi-hard processes in the large center-of-mass energy limit gives us an opportunity to further test perturbative QCD in an unexplored kinematical configuration, contributing to a better understanding of the dynamics of strong interactions. For semi-hard reactions in kinematics at large center-of-mass energy $\sqrt{s}$, the BFKL resummation of energy logarithms comes into play, since large energy logarithms compensate the smallness of QCD coupling $\alpha_s$ and must therefore be accounted for to all perturbative orders. Tracing the path toward performing precision calculations via BFKL resummation of high-energy logarithms, in this thesis we present phenomenological analyses for distinct inclusive processes, highlighting the recognized problem of instabilities under higher-order corrections and energy-scales variations, that would abort any possibility to investigate semi-hard reactions with high-precision at natural energy-scales. At the same time, we present new reactions that seem to act as fair stabilizers of the high-energy series. First, the inclusive production at the LHC of a charged light hadron and of a jet, featuring a wide separation in rapidity, is presented making use of optimization methods to fix energy-scale. We report some predictions, tailored on the CMS and CASTOR acceptances. Then, we propose as a novel probe channel for the manifestation of the BFKL dynamics, the inclusive hadroproduction of a Higgs boson and of a jet, featuring large transverse momenta and well separated in rapidity. Finlay, we propose the inclusive semi-hard production of two bottom-flavored hadrons, as well as of a single bottom-flavored hadron accompanied by a light jet, as novel channels for targeting stabilization effects of the high-energy resummation under higher-order corrections. |
hep-ph/9908405 | Kingman Cheung | Kingman Cheung (UC-Davis) | $B_c$ meson production at the Tevatron Revisited | minor changes in text and figure | Phys.Lett.B472:408-411,2000 | 10.1016/S0370-2693(99)01402-1 | UCD-HEP-99-15 | hep-ph | null | CDF recently measured the quantity $\frac{\sigma(B_c^+)}{\sigma(B^+)}
\frac{{\rm BR}(B_c^+ \to J/\psi \ell^+ \nu)}{{\rm BR}(B^+ \to J/\psi K^+)}$,
{}from which we determine the ratio $\frac{\sigma(B_c^+)}{\sigma(\bar b)}$ to
be $(2.08\err{1.06}{0.95})\times 10^{-3}$. In this note, we show that the ratio
$\frac{\sigma(B_c^+)}{\sigma(\bar b)}$ obtained by dividing the $\sigma(B_c^+)$
by the leading order $\sigma(\bar b)$ is consistent with this derived CDF
measurement. We calculate the cross section $\sigma(B_c^+)$ using the
perturbative QCD fragmentation functions of Braaten, Cheung, and Yuan and the
corresponding induced gluon fragmentation functions, with the charm-quark mass
$m_c$ as a parameter. We also estimate the parameter $m_c$ from the CDF data
and then predict the production rate at RunII.
| [
{
"created": "Wed, 18 Aug 1999 22:30:57 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Sep 1999 20:53:22 GMT",
"version": "v2"
},
{
"created": "Mon, 15 Nov 1999 21:22:54 GMT",
"version": "v3"
}
] | 2014-11-17 | [
[
"Cheung",
"Kingman",
"",
"UC-Davis"
]
] | CDF recently measured the quantity $\frac{\sigma(B_c^+)}{\sigma(B^+)} \frac{{\rm BR}(B_c^+ \to J/\psi \ell^+ \nu)}{{\rm BR}(B^+ \to J/\psi K^+)}$, {}from which we determine the ratio $\frac{\sigma(B_c^+)}{\sigma(\bar b)}$ to be $(2.08\err{1.06}{0.95})\times 10^{-3}$. In this note, we show that the ratio $\frac{\sigma(B_c^+)}{\sigma(\bar b)}$ obtained by dividing the $\sigma(B_c^+)$ by the leading order $\sigma(\bar b)$ is consistent with this derived CDF measurement. We calculate the cross section $\sigma(B_c^+)$ using the perturbative QCD fragmentation functions of Braaten, Cheung, and Yuan and the corresponding induced gluon fragmentation functions, with the charm-quark mass $m_c$ as a parameter. We also estimate the parameter $m_c$ from the CDF data and then predict the production rate at RunII. |
0811.2727 | P\'eter Kov\'acs Dr. | T. Herpay, P. Kov\'acs | Pion condensation in the two--flavor chiral quark model at finite
baryochemical potential | 12 pages, 5 figures, submitted to PRD | Phys.Rev.D78:116008,2008 | 10.1103/PhysRevD.78.116008 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Pion condensation is studied at one--loop level and nonzero baryochemical
potential in the framework of two flavor constituent quark model using the
one--loop level optimized perturbation theory for the resummation of the
perturbative series. A Landau type of analysis is presented for the
investigation of the phase boundary between the pion condensed/non-condensed
phases. The statement that the condensation starts at $\muI = m_{\pi}$ is
slightly modified by one--loop corrections. The second order critical surface
is determined and analysed in the $\muI-\muB-T$ space. The $\muI$ dependence of
the one--loop level charged pion pole masses is also studied.
| [
{
"created": "Mon, 17 Nov 2008 20:13:45 GMT",
"version": "v1"
}
] | 2010-04-28 | [
[
"Herpay",
"T.",
""
],
[
"Kovács",
"P.",
""
]
] | Pion condensation is studied at one--loop level and nonzero baryochemical potential in the framework of two flavor constituent quark model using the one--loop level optimized perturbation theory for the resummation of the perturbative series. A Landau type of analysis is presented for the investigation of the phase boundary between the pion condensed/non-condensed phases. The statement that the condensation starts at $\muI = m_{\pi}$ is slightly modified by one--loop corrections. The second order critical surface is determined and analysed in the $\muI-\muB-T$ space. The $\muI$ dependence of the one--loop level charged pion pole masses is also studied. |
1412.5986 | Joel Walker | Bhaskar Dutta, Tianjun Li, James A. Maxin, Dimitri V. Nanopoulos,
Kuver Sinha, and Joel W. Walker | Third Generation in Cascade Decays | 12 pages, 18 figures | Phys. Rev. D 91, 115021 (2015) | 10.1103/PhysRevD.91.115021 | MIFPA-14-36; ACT-12-14 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In supersymmetric models with gluinos around 1000-2000 GeV, new physics
searches based on cascade decay products of the gluino are viable at the next
run of the LHC. We investigate a scenario where the light stop is lighter than
the gluino and both are lighter than all other squarks, and show that its
signal can be established using multi b-jet, multi W and/or multi lepton final
state topologies. We then utilize both boosted and conventional jet topologies
in the final state in conjunction with di-tau production as a probe of the
stau-neutralino co-annihilation region responsible for the model's dark matter
content. This study is performed in the specific context of one such
phenomenologically viable model named No-Scale F-SU(5).
| [
{
"created": "Thu, 18 Dec 2014 18:24:23 GMT",
"version": "v1"
}
] | 2015-07-01 | [
[
"Dutta",
"Bhaskar",
""
],
[
"Li",
"Tianjun",
""
],
[
"Maxin",
"James A.",
""
],
[
"Nanopoulos",
"Dimitri V.",
""
],
[
"Sinha",
"Kuver",
""
],
[
"Walker",
"Joel W.",
""
]
] | In supersymmetric models with gluinos around 1000-2000 GeV, new physics searches based on cascade decay products of the gluino are viable at the next run of the LHC. We investigate a scenario where the light stop is lighter than the gluino and both are lighter than all other squarks, and show that its signal can be established using multi b-jet, multi W and/or multi lepton final state topologies. We then utilize both boosted and conventional jet topologies in the final state in conjunction with di-tau production as a probe of the stau-neutralino co-annihilation region responsible for the model's dark matter content. This study is performed in the specific context of one such phenomenologically viable model named No-Scale F-SU(5). |
hep-ph/0507224 | Pedro Miguel Martins Ferreira | A. Barroso, P.M. Ferreira and R. Santos | Charge and CP symmetry breaking in two Higgs doublet models | null | Phys.Lett. B632 (2006) 684-687 | 10.1016/j.physletb.2005.11.031 | null | hep-ph | null | We show that, for the most generic model with two Higgs doublets possessing a
minimum that preserves the $U(1)_{em}$ symmetry, charge breaking (CB) cannot
occur. If CB does not occur, the potential could have two different minima, and
there is in principle no general argument to show which one is the deepest. The
depth of the potential at a stationary point that breaks CB or CP, relative to
the $U(1)_{em}$ preserving minimum, is proportional to the squared mass of the
charged or pseudoscalar Higgs, respectively.
| [
{
"created": "Tue, 19 Jul 2005 13:19:41 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Jul 2005 13:17:23 GMT",
"version": "v2"
},
{
"created": "Mon, 7 Nov 2005 12:16:25 GMT",
"version": "v3"
}
] | 2009-11-11 | [
[
"Barroso",
"A.",
""
],
[
"Ferreira",
"P. M.",
""
],
[
"Santos",
"R.",
""
]
] | We show that, for the most generic model with two Higgs doublets possessing a minimum that preserves the $U(1)_{em}$ symmetry, charge breaking (CB) cannot occur. If CB does not occur, the potential could have two different minima, and there is in principle no general argument to show which one is the deepest. The depth of the potential at a stationary point that breaks CB or CP, relative to the $U(1)_{em}$ preserving minimum, is proportional to the squared mass of the charged or pseudoscalar Higgs, respectively. |
1608.00583 | Andrey Katz | Andrey Katz and Antonio Riotto | Baryogenesis and Gravitational Waves from Runaway Bubble Collisions | 30 pages, 8 figures. v2: typos fixed and references added v3:
discussion regarding the lifetime of the dark Z's fixed and the discussion on
their relic abundance is removed, minor corrections, and references added.
Conclusions are intact. Accepted to JCAP | null | 10.1088/1475-7516/2016/11/011 | CERN-TH-2016-173 | hep-ph astro-ph.CO gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a novel mechanism for production of baryonic asymmetry in the
early Universe. The mechanism takes advantage of the strong first order phase
transition that produces runaway bubbles in the hidden sector that propagate
almost without friction with ultra-relativistic velocities. Collisions of such
bubbles can non-thermally produce heavy particles that further decay
out-of-equilibrium into the SM and produce the observed baryonic asymmetry.
This process can proceed at the very low temperatures, providing a new
mechanism of post-sphaleron baryogenesis. In this paper we present a fully
calculable model which produces the baryonic asymmetry along these lines as
well as evades all the existing cosmological constraints. We emphasize that the
Gravitational Waves signal from the first order phase transition is completely
generic and can potentially be detected by the future eLISA interferometer. We
also discuss other potential signals, which are more model dependent, and point
out the unresolved theoretical questions related to our proposal.
| [
{
"created": "Mon, 1 Aug 2016 20:00:06 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Aug 2016 21:15:09 GMT",
"version": "v2"
},
{
"created": "Thu, 27 Oct 2016 10:32:32 GMT",
"version": "v3"
}
] | 2016-11-15 | [
[
"Katz",
"Andrey",
""
],
[
"Riotto",
"Antonio",
""
]
] | We propose a novel mechanism for production of baryonic asymmetry in the early Universe. The mechanism takes advantage of the strong first order phase transition that produces runaway bubbles in the hidden sector that propagate almost without friction with ultra-relativistic velocities. Collisions of such bubbles can non-thermally produce heavy particles that further decay out-of-equilibrium into the SM and produce the observed baryonic asymmetry. This process can proceed at the very low temperatures, providing a new mechanism of post-sphaleron baryogenesis. In this paper we present a fully calculable model which produces the baryonic asymmetry along these lines as well as evades all the existing cosmological constraints. We emphasize that the Gravitational Waves signal from the first order phase transition is completely generic and can potentially be detected by the future eLISA interferometer. We also discuss other potential signals, which are more model dependent, and point out the unresolved theoretical questions related to our proposal. |
hep-ph/0408262 | R. Sekhar Chivukula | R. Sekhar Chivukula, Hong-Jian He, Masafumi Kurachi, Elizabeth H.
Simmons, and Masaharu Tanabashi | Universal Non-Oblique Corrections in Higgsless Models and Beyond | 13 pages, 2 eps figures | Phys.Lett. B603 (2004) 210-218 | 10.1016/j.physletb.2004.10.026 | MSUHEP-040824, DPNU-04-15, TU-728 | hep-ph hep-ex | null | Recently Barbieri, et al. have introduced a formalism to express the
deviations of electroweak interactions from their standard model forms in
"universal" theories, i.e. theories in which the corrections due to new physics
can be expressed solely by modifications to the two-point correlation function
of electroweak gauge currents of fermions. The parameters introduced by these
authors are defined by the properties of the correlation functions at zero
momentum, and differ from the quantities calculated by examining the on-shell
properties of the electroweak gauge bosons. In this letter we discuss the
relationship between the zero-momentum and on-shell parameters. In addition, we
present the results of a calculation of these zero-momentum parameters in an
arbitrary Higgsless model in which the low-energy rho parameter is one and
which can be deconstructed to a linear chain of SU(2) groups adjacent to a
chain of U(1) groups. Our results demonstrate the importance of the universal
"non-oblique" corrections which are present and elucidate the relationships
among various calculations of electroweak quantities in these models. Our
expressions for these zero-momentum parameters depend only on the spectrum of
heavy vector-boson masses; therefore, the minimum size of the deviations
present in these models is related to the upper bound on the heavy vector-boson
masses derived from unitarity. We find that these models are disfavored by
precision electroweak data, independent of any assumptions about the background
metric or the behavior of the bulk coupling.
| [
{
"created": "Tue, 24 Aug 2004 20:31:38 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Oct 2004 15:08:18 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Chivukula",
"R. Sekhar",
""
],
[
"He",
"Hong-Jian",
""
],
[
"Kurachi",
"Masafumi",
""
],
[
"Simmons",
"Elizabeth H.",
""
],
[
"Tanabashi",
"Masaharu",
""
]
] | Recently Barbieri, et al. have introduced a formalism to express the deviations of electroweak interactions from their standard model forms in "universal" theories, i.e. theories in which the corrections due to new physics can be expressed solely by modifications to the two-point correlation function of electroweak gauge currents of fermions. The parameters introduced by these authors are defined by the properties of the correlation functions at zero momentum, and differ from the quantities calculated by examining the on-shell properties of the electroweak gauge bosons. In this letter we discuss the relationship between the zero-momentum and on-shell parameters. In addition, we present the results of a calculation of these zero-momentum parameters in an arbitrary Higgsless model in which the low-energy rho parameter is one and which can be deconstructed to a linear chain of SU(2) groups adjacent to a chain of U(1) groups. Our results demonstrate the importance of the universal "non-oblique" corrections which are present and elucidate the relationships among various calculations of electroweak quantities in these models. Our expressions for these zero-momentum parameters depend only on the spectrum of heavy vector-boson masses; therefore, the minimum size of the deviations present in these models is related to the upper bound on the heavy vector-boson masses derived from unitarity. We find that these models are disfavored by precision electroweak data, independent of any assumptions about the background metric or the behavior of the bulk coupling. |
1805.02637 | Prasanna Kumar Dhani | Pulak Banerjee, Prasanna K. Dhani and V. Ravindran | Gluon jet function at three loops in QCD | 7 pages | Phys. Rev. D 98, 094016 (2018) | 10.1103/PhysRevD.98.094016 | IMSc/2018/05/04 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present here the first result on the three-loop gluon jet function in
perturbative QCD. Using the three-loop coefficient functions [1,2] for
deep-inelastic scattering via the exchange of a virtual photon that couples to
quarks or a scalar that couples to gluons and employing the KG equation,
renormalization group invariance and factorization theorem, we obtain both the
quark and the gluon jet functions up to the three-loop level. The former agrees
with the recent result [3]. These jet functions being universal ingredients for
many collider and decay processes, will play an important role in the
phenomenological studies at the Large Hadron Collider.
| [
{
"created": "Mon, 7 May 2018 17:46:44 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Nov 2018 11:12:20 GMT",
"version": "v2"
}
] | 2018-11-28 | [
[
"Banerjee",
"Pulak",
""
],
[
"Dhani",
"Prasanna K.",
""
],
[
"Ravindran",
"V.",
""
]
] | We present here the first result on the three-loop gluon jet function in perturbative QCD. Using the three-loop coefficient functions [1,2] for deep-inelastic scattering via the exchange of a virtual photon that couples to quarks or a scalar that couples to gluons and employing the KG equation, renormalization group invariance and factorization theorem, we obtain both the quark and the gluon jet functions up to the three-loop level. The former agrees with the recent result [3]. These jet functions being universal ingredients for many collider and decay processes, will play an important role in the phenomenological studies at the Large Hadron Collider. |
2406.05584 | Mikhail Lukashov | M.S. Lukashov, Yu.A. Simonov | New ideas in nonperturbative QCD -- I | v2: LaTeX, 26 pages, 2 figures, 2 tables; some typos corrected | null | null | null | hep-ph hep-ex hep-lat hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The recent development of the Field Correlator Method (FCM) is discussed,
with applications to the most interesting areas of QCD physics obtained in the
lattice data and experiment. These areas include: a) the connection of
colorelectric confinement with the basic quark and gluon condensates; b) the
explicit form of the colorelectric deconfinement at a growing temperature $T$;
c) the theory of the colormagnetic confinement at all temperatures; d) the
theory of strong decays, the theory of pdf and jets in the instantaneous
formalism with confinement. We demonstrate that the FCM with instantaneous
formalism and confinement (instead of the light cone formalism and pure
perturbation theory) can provide the way to the theory of QCD, which helps to
describe world data without phenomenological parameters.
| [
{
"created": "Sat, 8 Jun 2024 21:57:22 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Jul 2024 23:39:18 GMT",
"version": "v2"
}
] | 2024-07-16 | [
[
"Lukashov",
"M. S.",
""
],
[
"Simonov",
"Yu. A.",
""
]
] | The recent development of the Field Correlator Method (FCM) is discussed, with applications to the most interesting areas of QCD physics obtained in the lattice data and experiment. These areas include: a) the connection of colorelectric confinement with the basic quark and gluon condensates; b) the explicit form of the colorelectric deconfinement at a growing temperature $T$; c) the theory of the colormagnetic confinement at all temperatures; d) the theory of strong decays, the theory of pdf and jets in the instantaneous formalism with confinement. We demonstrate that the FCM with instantaneous formalism and confinement (instead of the light cone formalism and pure perturbation theory) can provide the way to the theory of QCD, which helps to describe world data without phenomenological parameters. |
2308.12850 | Chris White | Melissa van Beekveld, Abhinava Danish, Eric Laenen, Sourav Pal, Anurag
Tripathi and Chris D. White | Next-to-soft radiation from a different angle | 26 pages, 6 figures | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Soft and collinear radiation in collider processes can be described in a
universal way, that is independent of the underlying process. Recent years have
seen a number of approaches for probing whether radiation beyond the leading
soft approximation can also be systematically classified. In this paper, we
study a formula that captures the leading next-to-soft QCD radiation affecting
processes with both final- and initial-state partons, by shifting the momenta
in the non-radiative squared amplitude. We first examine W+jet production, and
show that a previously derived formula of this type indeed holds in the case in
which massive colour singlet particles are present in the final state. Next, we
develop a physical understanding of the momentum shifts, showing precisely how
they disrupt the well-known angular ordering property of leading soft
radiation.
| [
{
"created": "Thu, 24 Aug 2023 15:16:20 GMT",
"version": "v1"
}
] | 2023-08-25 | [
[
"van Beekveld",
"Melissa",
""
],
[
"Danish",
"Abhinava",
""
],
[
"Laenen",
"Eric",
""
],
[
"Pal",
"Sourav",
""
],
[
"Tripathi",
"Anurag",
""
],
[
"White",
"Chris D.",
""
]
] | Soft and collinear radiation in collider processes can be described in a universal way, that is independent of the underlying process. Recent years have seen a number of approaches for probing whether radiation beyond the leading soft approximation can also be systematically classified. In this paper, we study a formula that captures the leading next-to-soft QCD radiation affecting processes with both final- and initial-state partons, by shifting the momenta in the non-radiative squared amplitude. We first examine W+jet production, and show that a previously derived formula of this type indeed holds in the case in which massive colour singlet particles are present in the final state. Next, we develop a physical understanding of the momentum shifts, showing precisely how they disrupt the well-known angular ordering property of leading soft radiation. |
hep-ph/0412323 | Robert L. Thews | R. L. Thews | Heavy Flavor Probes of Quark Matter | Based on invited plenary talk at Strange Quark Matter 2004, Cape
Town, South Africa, September 15-20, 2004, references completed, published in
J. Phys. G: Nucl. Part. Phys. 31 (2005) S641-S649 | J.Phys. G31 (2005) S641-S650 | 10.1088/0954-3899/31/6/003 | null | hep-ph | null | A brief survey of the role of heavy flavors as a probe of the state of matter
produced by high energy heavy ion collisions is presented. Specific examples
include energy loss, initial state gluon saturation, thermalization and flow.
The formation of quarkonium bound states from interactions in which multiple
heavy quark-antiquark pairs are initially produced is examined in general.
Results from statistical hadronization and kinetic models are summarized. New
predictions from the kinetic model for J/Psi at RHIC are presented.
| [
{
"created": "Tue, 21 Dec 2004 22:25:37 GMT",
"version": "v1"
},
{
"created": "Thu, 26 May 2005 16:45:57 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Thews",
"R. L.",
""
]
] | A brief survey of the role of heavy flavors as a probe of the state of matter produced by high energy heavy ion collisions is presented. Specific examples include energy loss, initial state gluon saturation, thermalization and flow. The formation of quarkonium bound states from interactions in which multiple heavy quark-antiquark pairs are initially produced is examined in general. Results from statistical hadronization and kinetic models are summarized. New predictions from the kinetic model for J/Psi at RHIC are presented. |
1611.04117 | Rauf Mukhamedshin A. | Rauf Mukhamedshin (Institute for Nuclear Research, Russian Academy of
Sciences) | LHC data and cosmic ray coplanarity at superhigh energies | 8 pages, 21 PostScript figures, will be published in EPJ WoC (Proc.
ISVHECRI 2016) | null | 10.1051/epjconf/201714513003 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A new phenomenological model FANSY 2.0 is designed, which makes it possible
to simulate hadron interactions via traditional QGSM-type particle generation
as well as coplanar generation of most energetic particles, observed in cosmic
ray experiments. FANSY 2.0 reproduces a lot of LHC (ALICE, ATLAS, CMS, TOTEM,
LHCf) data. Results of model simulations are compared with LHC data. Problems
of coplanarity are considered and a testing experiment is proposed.
| [
{
"created": "Sun, 13 Nov 2016 11:34:01 GMT",
"version": "v1"
}
] | 2018-08-29 | [
[
"Mukhamedshin",
"Rauf",
"",
"Institute for Nuclear Research, Russian Academy of\n Sciences"
]
] | A new phenomenological model FANSY 2.0 is designed, which makes it possible to simulate hadron interactions via traditional QGSM-type particle generation as well as coplanar generation of most energetic particles, observed in cosmic ray experiments. FANSY 2.0 reproduces a lot of LHC (ALICE, ATLAS, CMS, TOTEM, LHCf) data. Results of model simulations are compared with LHC data. Problems of coplanarity are considered and a testing experiment is proposed. |
2306.06676 | Arjun Berera | Arjun Berera, Jaime Calder\'on-Figueroa, Liang Chen, and Thomas W.
Kephart | Astrophysically sourced quantum coherent photonic signals | 5 pages | Phys. Rev. D 108, 043033 (2023) | 10.1103/PhysRevD.108.043033 | null | hep-ph astro-ph.SR quant-ph | http://creativecommons.org/licenses/by/4.0/ | Stimulated emission is shown to be robust in stars. Through Bose enhancement
this produces quantum states of aligned, monochromatic photons similar to a
laser. The probability of creating such states is computed. We show that from
the solar corona such quantum states would propagate outside of the solar
region and through the Solar System without decoherence. For a $1 {\rm m}^2$
detector at the distance of the Earth from the Sun we estimate rates of such
quantum states in the few per second thus potentially detectable. The same
process should lead to such quantum states also arriving from stars at
interstellar distances.
| [
{
"created": "Sun, 11 Jun 2023 13:25:06 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Sep 2023 12:00:18 GMT",
"version": "v2"
}
] | 2023-09-06 | [
[
"Berera",
"Arjun",
""
],
[
"Calderón-Figueroa",
"Jaime",
""
],
[
"Chen",
"Liang",
""
],
[
"Kephart",
"Thomas W.",
""
]
] | Stimulated emission is shown to be robust in stars. Through Bose enhancement this produces quantum states of aligned, monochromatic photons similar to a laser. The probability of creating such states is computed. We show that from the solar corona such quantum states would propagate outside of the solar region and through the Solar System without decoherence. For a $1 {\rm m}^2$ detector at the distance of the Earth from the Sun we estimate rates of such quantum states in the few per second thus potentially detectable. The same process should lead to such quantum states also arriving from stars at interstellar distances. |
hep-ph/0608183 | Stuart Raby | Stuart Raby | Grand Unified Theories | 22 pages, 18 figures, Invited talk given at the 2nd World Summit on
Physics Beyond the Standard Model, Galapagos Islands, Ecuador, June 22-25,
2006 | null | null | null | hep-ph | null | In this talk I briefly review the status of SUSY GUTs in 4, 5, 6 and 10
dimensions, focusing on the issue of gauge coupling unification and proton
decay. I then discuss the predictions of the minimal SO(10) SUSY model
[MSO$_{10}$SM].
| [
{
"created": "Wed, 16 Aug 2006 18:15:23 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Raby",
"Stuart",
""
]
] | In this talk I briefly review the status of SUSY GUTs in 4, 5, 6 and 10 dimensions, focusing on the issue of gauge coupling unification and proton decay. I then discuss the predictions of the minimal SO(10) SUSY model [MSO$_{10}$SM]. |
0904.2266 | V. Gogokhia | V. Gogokhia | Nonlinear iteration solution for the full gluon propagator as a function
of the mass gap | 16 pages, no figures, no tables, a few new references are added | Int. J. Theor. Phys. 48 (2009) 3470 | 10.1007/s10773-009-1051-6 | null | hep-ph hep-th | http://creativecommons.org/licenses/by/3.0/ | We have explicitly shown that QCD is the color gauge invariant theory at
non-zero mass gap as well. It has been defined as the value of the regularized
full gluon self-energy at some finite point. The mass gap is mainly generated
by the nonlinear interaction of massless gluon modes. All this allows one to
establish the structure of the full gluon propagator in the explicit presence
of the mass gap. In this case, the two independent general types of formal
solutions for the full gluon propagator as a function of the regularized mass
gap have been found. The nonlinear iteration solution at which the gluons
remain massless is explicitly present. The existence of the solution with an
effective gluon mass is also demonstrated.
| [
{
"created": "Wed, 15 Apr 2009 09:21:43 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Jul 2009 12:07:49 GMT",
"version": "v2"
},
{
"created": "Mon, 28 Sep 2009 12:34:05 GMT",
"version": "v3"
}
] | 2009-12-07 | [
[
"Gogokhia",
"V.",
""
]
] | We have explicitly shown that QCD is the color gauge invariant theory at non-zero mass gap as well. It has been defined as the value of the regularized full gluon self-energy at some finite point. The mass gap is mainly generated by the nonlinear interaction of massless gluon modes. All this allows one to establish the structure of the full gluon propagator in the explicit presence of the mass gap. In this case, the two independent general types of formal solutions for the full gluon propagator as a function of the regularized mass gap have been found. The nonlinear iteration solution at which the gluons remain massless is explicitly present. The existence of the solution with an effective gluon mass is also demonstrated. |
hep-ph/0602230 | Graciela B. Gelmini | Graciela B. Gelmini and Paolo Gondolo | Neutralino with the Right Cold Dark Matter Abundance in (Almost) Any
Supersymmetric Model | 4 pages, 1 figure | Phys.Rev. D74 (2006) 023510 | 10.1103/PhysRevD.74.023510 | UCLA/06/TEP/07 | hep-ph | null | We consider non-standard cosmological models in which the late decay of a
scalar field $\phi$ reheats the Universe to a low reheating temperature,
between 5 MeV and the standard freeze-out temperature of neutralinos of mass
$m_{\chi}$. We point out that in these models all neutralinos with standard
density $\Omega_{\rm std} \gtrsim 10^{-5} (100 {\rm GeV}/m_\chi)$ can have the
density of cold dark matter, provided the right combination of the following
two parameters can be achieved in the high energy theory: the reheating
temperature, and the ratio of the number of neutralinos produced per $\phi$
decay over the $\phi$ field mass. We present the ranges of these parameters
where a combination of thermal and non-thermal neutralino production leads to
the desired density, as functions of $\Omega_{\rm std}$ and $m_{\chi}$.
| [
{
"created": "Fri, 24 Feb 2006 23:59:01 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Gelmini",
"Graciela B.",
""
],
[
"Gondolo",
"Paolo",
""
]
] | We consider non-standard cosmological models in which the late decay of a scalar field $\phi$ reheats the Universe to a low reheating temperature, between 5 MeV and the standard freeze-out temperature of neutralinos of mass $m_{\chi}$. We point out that in these models all neutralinos with standard density $\Omega_{\rm std} \gtrsim 10^{-5} (100 {\rm GeV}/m_\chi)$ can have the density of cold dark matter, provided the right combination of the following two parameters can be achieved in the high energy theory: the reheating temperature, and the ratio of the number of neutralinos produced per $\phi$ decay over the $\phi$ field mass. We present the ranges of these parameters where a combination of thermal and non-thermal neutralino production leads to the desired density, as functions of $\Omega_{\rm std}$ and $m_{\chi}$. |
0901.0997 | Pedro Brogueira | P. Brogueira, J. Dias de Deus and C. Pajares | Long range forward-backward rapiditiy correlations in proton-proton
collisions at LHC | 9 pages, 4 figures (eps), latex | Phys.Lett.B675:308-311,2009 | 10.1016/j.physletb.2009.04.025 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We argue that string percolation is in the origin of i) an approximately flat
rapidity distribution and of ii) an approximately constant forward-backward
correlation parameter $b$ over a substantial fraction of the available
rapidity. Predictions are given for $pp$ collisions at LHC, $\sqrt{s}=14$TeV
and $\sqrt{s}=5.5$TeV.
| [
{
"created": "Thu, 8 Jan 2009 09:48:00 GMT",
"version": "v1"
}
] | 2014-11-18 | [
[
"Brogueira",
"P.",
""
],
[
"de Deus",
"J. Dias",
""
],
[
"Pajares",
"C.",
""
]
] | We argue that string percolation is in the origin of i) an approximately flat rapidity distribution and of ii) an approximately constant forward-backward correlation parameter $b$ over a substantial fraction of the available rapidity. Predictions are given for $pp$ collisions at LHC, $\sqrt{s}=14$TeV and $\sqrt{s}=5.5$TeV. |
1611.08081 | Ning Chen | Ning Chen | The LHC searches for heavy neutral Higgs bosons by jet substructure
analysis | 17 pages, 9 figures, proceedings of Hong Kong IAS conference 2016,
based on two previous published papers of: 1410.4447, 1509.03848 | IJMPA's Volume No.31, Issue No. 33, 2016 | 10.1142/S0217751X16440097 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The two-Higgs-doublet model contains extra Higgs bosons, with mass ranges
spanning from several hundred GeV to about 1 TeV. We study the possible
experimental searches for the neutral Higgs bosons of $A$ and $H$ at the future
high-luminosity LHC runs. Besides of the conventional search modes that are
inspired by the supersymmetric models, we discuss two search modes which were
not quite addressed previously. They are the decay modes of $A\to hZ$ and $A/H
\to t \bar t$. Thanks to the technique of tagging boosted objects of SM-like
Higgs bosons and top quarks, we show the improved mass reaches for heavy
neutral Higgs bosons with masses up to $\sim{\cal O}(1)\,\TeV$. The modes
proposed here are complementary to the conventional experimental searches
motivated by the MSSM.
| [
{
"created": "Thu, 24 Nov 2016 06:57:52 GMT",
"version": "v1"
}
] | 2016-11-28 | [
[
"Chen",
"Ning",
""
]
] | The two-Higgs-doublet model contains extra Higgs bosons, with mass ranges spanning from several hundred GeV to about 1 TeV. We study the possible experimental searches for the neutral Higgs bosons of $A$ and $H$ at the future high-luminosity LHC runs. Besides of the conventional search modes that are inspired by the supersymmetric models, we discuss two search modes which were not quite addressed previously. They are the decay modes of $A\to hZ$ and $A/H \to t \bar t$. Thanks to the technique of tagging boosted objects of SM-like Higgs bosons and top quarks, we show the improved mass reaches for heavy neutral Higgs bosons with masses up to $\sim{\cal O}(1)\,\TeV$. The modes proposed here are complementary to the conventional experimental searches motivated by the MSSM. |
hep-ph/9912540 | Per Osland | Per Osland (Bergen), Tai Tsun Wu (Harvard, CERN) | Solar Mikheyev-Smirnov-Wolfenstein Effect with Three Generations of
Neutrinos | 22 pages, LaTeX, including 2 figures | Phys.Rev. D62 (2000) 013008 | 10.1103/PhysRevD.62.013008 | CERN-TH/99-286 | hep-ph | null | Under the assumption that the density variation of the electrons can be
approximated by an exponential function, the solar Mikheyev-Smirnov-Wolfenstein
effect is treated for three generations of neutrinos. The generalized
hypergeometric functions that result from the exact solution of this problem
are studied in detail, and a method for their numerical evaluation is
presented. This analysis plays a central role in the determination of neutrino
masses, not only the differences of their squares, under the assumption of
universal quark-lepton mixing.
| [
{
"created": "Wed, 29 Dec 1999 18:13:19 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Osland",
"Per",
"",
"Bergen"
],
[
"Wu",
"Tai Tsun",
"",
"Harvard, CERN"
]
] | Under the assumption that the density variation of the electrons can be approximated by an exponential function, the solar Mikheyev-Smirnov-Wolfenstein effect is treated for three generations of neutrinos. The generalized hypergeometric functions that result from the exact solution of this problem are studied in detail, and a method for their numerical evaluation is presented. This analysis plays a central role in the determination of neutrino masses, not only the differences of their squares, under the assumption of universal quark-lepton mixing. |
1310.3045 | Tim Stefaniak | Philip Bechtle, Klaus Desch, Herbert K. Dreiner, Matthias Hamer,
Michael Kr\"amer, Ben O'Leary, Werner Porod, Xavier Prudent, Bj\"orn
Sarrazin, Tim Stefaniak, Mathias Uhlenbrock, Peter Wienemann | Constrained Supersymmetry after the Higgs Boson Discovery: A global
analysis with Fittino | 6 pages, 6 figures; To appear in the Proceedings of The European
Physical Society Conference on High Energy Physics (EPS-HEP2013), 18-24 July
2013, Stockholm, Sweden | null | null | BONN-TH-2013-19 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present preliminary results from the latest global fit analysis of the
constrained minimal supersymmetric standard model (CMSSM) performed within the
Fittino framework. The fit includes low-energy and astrophysical observables as
well as collider constraints from the non-observation of new physics in
supersymmetric searches at the LHC. Furthermore, the Higgs boson mass and
signal rate measurements from both the LHC and Tevatron experiments are
included via the program HiggsSignals. Although the LHC exclusion limits and
the Higgs mass measurements put tight constraints on the viable parameter
space, we find an acceptable fit quality once the Higgs signal rates are
included.
| [
{
"created": "Fri, 11 Oct 2013 08:22:07 GMT",
"version": "v1"
}
] | 2013-10-14 | [
[
"Bechtle",
"Philip",
""
],
[
"Desch",
"Klaus",
""
],
[
"Dreiner",
"Herbert K.",
""
],
[
"Hamer",
"Matthias",
""
],
[
"Krämer",
"Michael",
""
],
[
"O'Leary",
"Ben",
""
],
[
"Porod",
"Werner",
""
],
[
... | We present preliminary results from the latest global fit analysis of the constrained minimal supersymmetric standard model (CMSSM) performed within the Fittino framework. The fit includes low-energy and astrophysical observables as well as collider constraints from the non-observation of new physics in supersymmetric searches at the LHC. Furthermore, the Higgs boson mass and signal rate measurements from both the LHC and Tevatron experiments are included via the program HiggsSignals. Although the LHC exclusion limits and the Higgs mass measurements put tight constraints on the viable parameter space, we find an acceptable fit quality once the Higgs signal rates are included. |
1802.06229 | Alex Keshavarzi | Alexander Keshavarzi, Daisuke Nomura, Thomas Teubner | The hadronic vacuum polarisation contributions to the muon $g-2$ | Presented at Old and New Strong Interactions from LHC to Future
Colliders (LFC17), C17-09-11.6 | null | null | LTH 1154, C17-09-11.6 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The hadronic vacuum polarisation contributions to the anomalous magnetic
moment of the muon, $a_{\mu}^{\rm had, VP}$ have been re-evaluated from the
combination of $e^+e^-\rightarrow {\rm hadrons}$ cross section data. Focus has
been placed on the development of a new data combination method, which fully
incorporates all correlated statistical and systematic uncertainties in a bias
free approach. Using these combined data have resulted in estimates of the
hadronic vacuum polarisation contributions to $g-2$ of the muon of
$a_{\mu}^{\rm had, \, LO \, VP} = (693.27 \pm 2.46)\times 10^{-10}$ and
$a_{\mu}^{\rm had, \, NLO \, VP} = (-9.82 \pm 0.04)\times 10^{-10}$. The new
estimate for the Standard Model prediction is found to be $a_{\mu}^{\rm SM} =
(11\ 659 \ 182.05 \pm 3.56) \times 10^{-10}$, which is $3.7\sigma$ below the
current experimental measurement. In addition, the prediction for the hadronic
contribution to the QED coupling at the $Z$ boson mass has been calculated to
be $\Delta\alpha_{\rm had}^{(5)}(M_Z^2)= (276.11 \pm 1.11)\times 10^{-4}$,
resulting in $\alpha^{-1}(M_Z^2) = 128.946 \pm 0.015$.
| [
{
"created": "Sat, 17 Feb 2018 11:59:14 GMT",
"version": "v1"
}
] | 2018-02-21 | [
[
"Keshavarzi",
"Alexander",
""
],
[
"Nomura",
"Daisuke",
""
],
[
"Teubner",
"Thomas",
""
]
] | The hadronic vacuum polarisation contributions to the anomalous magnetic moment of the muon, $a_{\mu}^{\rm had, VP}$ have been re-evaluated from the combination of $e^+e^-\rightarrow {\rm hadrons}$ cross section data. Focus has been placed on the development of a new data combination method, which fully incorporates all correlated statistical and systematic uncertainties in a bias free approach. Using these combined data have resulted in estimates of the hadronic vacuum polarisation contributions to $g-2$ of the muon of $a_{\mu}^{\rm had, \, LO \, VP} = (693.27 \pm 2.46)\times 10^{-10}$ and $a_{\mu}^{\rm had, \, NLO \, VP} = (-9.82 \pm 0.04)\times 10^{-10}$. The new estimate for the Standard Model prediction is found to be $a_{\mu}^{\rm SM} = (11\ 659 \ 182.05 \pm 3.56) \times 10^{-10}$, which is $3.7\sigma$ below the current experimental measurement. In addition, the prediction for the hadronic contribution to the QED coupling at the $Z$ boson mass has been calculated to be $\Delta\alpha_{\rm had}^{(5)}(M_Z^2)= (276.11 \pm 1.11)\times 10^{-4}$, resulting in $\alpha^{-1}(M_Z^2) = 128.946 \pm 0.015$. |
hep-ph/0310094 | Mingxing Luo | Mingxing Luo | S-Matrix Elements in General Renormalization Schemes | Final version appears in Phys. Lett. B | Phys.Lett. B579 (2004) 391-395 | 10.1016/j.physletb.2003.11.025 | null | hep-ph | null | Starting from the Lehmann-Symanzik-Zimmermann reduction theorem, we provide a
general procedure to extract S-matrix elements from Green functions in
arbitrary renormalization schemes.
| [
{
"created": "Wed, 8 Oct 2003 01:53:38 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Dec 2003 02:34:41 GMT",
"version": "v2"
}
] | 2015-06-25 | [
[
"Luo",
"Mingxing",
""
]
] | Starting from the Lehmann-Symanzik-Zimmermann reduction theorem, we provide a general procedure to extract S-matrix elements from Green functions in arbitrary renormalization schemes. |
hep-ph/9301262 | null | S. Kumano (Indiana U., present address: U. of Mainz) | Nuclear Gluon Distributions in a Parton Model | TEX file (10 pages); Figs.1-3 (TOPDRAWER) can be obtained from the
author upon request; preprint IU/NTC 92-21 (PL,B298,171(1993)) | Phys.Lett. B298 (1993) 171-175 | 10.1016/0370-2693(93)91725-3 | null | hep-ph nucl-th | null | Gluon distributions in the carbon and tin nuclei are investigated by using a
$Q^2$ rescaling model with parton recombination effects. We obtain strong
shadowings in the small $x$ region due to the recombinations. The ratio
$G_A(x)/G_N(x)$ in the medium $x$ region is typically 0.9 for medium size
nuclei. At large $x$, the ratio becomes large due to gluon fusions from
different nucleons. Comparisons with recent New Muon Collaboration data for
$G_{Sn} (x)/ G_C (x)$ indicate that more accurate experimental data are needed
for testing the model.
| [
{
"created": "Fri, 22 Jan 1993 16:31:00 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Kumano",
"S.",
"",
"Indiana U., present address: U. of Mainz"
]
] | Gluon distributions in the carbon and tin nuclei are investigated by using a $Q^2$ rescaling model with parton recombination effects. We obtain strong shadowings in the small $x$ region due to the recombinations. The ratio $G_A(x)/G_N(x)$ in the medium $x$ region is typically 0.9 for medium size nuclei. At large $x$, the ratio becomes large due to gluon fusions from different nucleons. Comparisons with recent New Muon Collaboration data for $G_{Sn} (x)/ G_C (x)$ indicate that more accurate experimental data are needed for testing the model. |
1711.03797 | Maciej Trzebinski | Maciej Trzebinski | GenEx - Exclusive Meson Generator | Proceeding from talk presented at EDS Blois 2017, Prague, Czech
Republic, June 26-30, 2017 | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Exclusive light meson production processes possible to be measured at RHIC
and LHC accelerators are briefly described. This includes Pomeron and photon
induced continuum of pions and kaons as well as $f_0$ and $\rho^0$ resonant
production. Next, GenEx, a new Monte Carlo generator recently developed in
Cracow, is presented. Its purpose is to generate resonant and non-resonant pion
and kaon production and diffractive Bremsstrahlung. Its future development will
take into account spin (polarization) effects and simulate corrections due to
absorption and re-scattering.
| [
{
"created": "Fri, 10 Nov 2017 12:57:48 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Nov 2017 11:56:29 GMT",
"version": "v2"
}
] | 2017-11-15 | [
[
"Trzebinski",
"Maciej",
""
]
] | Exclusive light meson production processes possible to be measured at RHIC and LHC accelerators are briefly described. This includes Pomeron and photon induced continuum of pions and kaons as well as $f_0$ and $\rho^0$ resonant production. Next, GenEx, a new Monte Carlo generator recently developed in Cracow, is presented. Its purpose is to generate resonant and non-resonant pion and kaon production and diffractive Bremsstrahlung. Its future development will take into account spin (polarization) effects and simulate corrections due to absorption and re-scattering. |
hep-ph/9308208 | null | A. Lleida and C. Munoz | Non-universal soft scalar masses in supersymmetric theories | Latex, 13 pages + 3 figs.(avalaible upon request) | Phys.Lett. B317 (1993) 82-91 | 10.1016/0370-2693(93)91574-7 | null | hep-ph | null | The existence of non--universal soft masses is the most general situation in
supersymmetric theories. We study the consecuences that this situation has for
the low--energy sparticle spectrum. In particular, we analize in detail the
contribution to the scalar mass renormalization group equations of the $U(1)_Y$
D--term. We obtain analytic expressions for the evolution of masses of the
three generations and these allow us to show that such a contribution can
produce important modifications on the spectrum. The necessity to avoid flavour
changing neutral currents does not constrain this result. Finally, we discuss a
realistic example in the context of string theory where the departure from
universality is large.
| [
{
"created": "Mon, 2 Aug 1993 23:34:00 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Lleida",
"A.",
""
],
[
"Munoz",
"C.",
""
]
] | The existence of non--universal soft masses is the most general situation in supersymmetric theories. We study the consecuences that this situation has for the low--energy sparticle spectrum. In particular, we analize in detail the contribution to the scalar mass renormalization group equations of the $U(1)_Y$ D--term. We obtain analytic expressions for the evolution of masses of the three generations and these allow us to show that such a contribution can produce important modifications on the spectrum. The necessity to avoid flavour changing neutral currents does not constrain this result. Finally, we discuss a realistic example in the context of string theory where the departure from universality is large. |
1006.0279 | Lei Guo | Su Ji-Juan, Ma Wen-Gan, Zhang Ren-You, and Guo Lei | Next-to-leading order QCD predictions for the hadronic $WH$+jet
production | 26 pages, 27 figures, accepted by Phys. Rev. D | Phys.Rev.D81:114037,2010 | 10.1103/PhysRevD.81.114037 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the next-to-leading order(NLO) QCD corrections to the $WH^0$
production in association with a jet at hadron colliders. We study the impacts
of the complete NLO QCD radiative corrections to the integrated cross sections,
the scale dependence of the cross sections, and the differential cross sections
($\frac{d \sigma}{d\cos\theta}$, $\frac{d \sigma}{dp_T}$) of the final $W$-,
Higgs-boson and jet. We find that the corrections significantly modify the
physical observables, and reduce the scale uncertainty of the LO cross section.
Our results show that by applying the inclusive scheme with $p_{T,j}^{cut}=20
GeV$ and taking $m_H=120 GeV$, $\mu=\mu_0\equiv\frac{1}{2}(m_W+m_H)$, the
K-factor is 1.15 for the process $p\bar p \to W^{\pm}H^0j+X$ at the Tevatron,
while the K-factors for the processes $pp \to W^-H^0j+X$ and $pp \to W^+H^0j+X$
at the LHC are 1.12 and 1.08 respectively. We conclude that to understand the
hadronic associated $WH^0$ production, it is necessary to study the NLO QCD
corrections to $WH^0j$ production process which is part of the inclusive $WH^0$
production.
| [
{
"created": "Wed, 2 Jun 2010 02:12:58 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Jun 2010 03:59:53 GMT",
"version": "v2"
}
] | 2015-03-17 | [
[
"Ji-Juan",
"Su",
""
],
[
"Wen-Gan",
"Ma",
""
],
[
"Ren-You",
"Zhang",
""
],
[
"Lei",
"Guo",
""
]
] | We calculate the next-to-leading order(NLO) QCD corrections to the $WH^0$ production in association with a jet at hadron colliders. We study the impacts of the complete NLO QCD radiative corrections to the integrated cross sections, the scale dependence of the cross sections, and the differential cross sections ($\frac{d \sigma}{d\cos\theta}$, $\frac{d \sigma}{dp_T}$) of the final $W$-, Higgs-boson and jet. We find that the corrections significantly modify the physical observables, and reduce the scale uncertainty of the LO cross section. Our results show that by applying the inclusive scheme with $p_{T,j}^{cut}=20 GeV$ and taking $m_H=120 GeV$, $\mu=\mu_0\equiv\frac{1}{2}(m_W+m_H)$, the K-factor is 1.15 for the process $p\bar p \to W^{\pm}H^0j+X$ at the Tevatron, while the K-factors for the processes $pp \to W^-H^0j+X$ and $pp \to W^+H^0j+X$ at the LHC are 1.12 and 1.08 respectively. We conclude that to understand the hadronic associated $WH^0$ production, it is necessary to study the NLO QCD corrections to $WH^0j$ production process which is part of the inclusive $WH^0$ production. |
2104.07509 | Luca Rottoli | Emanuele Re, Luca Rottoli, and Paolo Torrielli | Fiducial Higgs and Drell-Yan distributions at N$^3$LL$^\prime$+NNLO with
RadISH | 35 pages, 9 figures. Journal version | null | 10.1007/JHEP09(2021)108 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present state-of-the-art predictions for transverse observables relevant
to colour-singlet production at the LHC, in particular the transverse momentum
of the colour singlet in gluon-fusion Higgs production and in neutral Drell-Yan
lepton-pair production, as well as the $\phi^*_\eta$ observable in Drell Yan.
We perform a next-to-next-to-next-to-leading logarithmic (N$^3$LL) resummation
of such observables in momentum space according to the RadISH formalism,
consistently including in our prediction all constant terms of relative order
$\alpha_s^3$ with respect to the Born, thereby achieving N$^3$LL$^\prime$
accuracy. The calculation is fully exclusive with respect to the Born
kinematics, which allows the application of arbitrary fiducial selection cuts
on the decay products of the colour singlet. We supplement our results with a
transverse-recoil prescription, accounting for dominant classes of
subleading-power corrections in a fiducial setup. The resummed predictions are
matched with fixed-order differential spectra at next-to-next-to-leading order
(NNLO) accuracy. A phenomenological comparison is carried out with 13 TeV LHC
data relevant to the Higgs to di-photon channel, as well as to neutral
Drell-Yan lepton-pair production. Overall, the inclusion of ${\cal
O}(\alpha_s^3)$ constant terms, and to a lesser extent of transverse-recoil
effects, proves beneficial for the comparison of theoretical predictions to
data, leaving a residual theoretical uncertainty in the resummation region at
the 2-5% level for Drell-Yan observables, and 5-7% in Higgs production.
| [
{
"created": "Thu, 15 Apr 2021 15:06:26 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Aug 2021 09:53:38 GMT",
"version": "v2"
}
] | 2021-10-13 | [
[
"Re",
"Emanuele",
""
],
[
"Rottoli",
"Luca",
""
],
[
"Torrielli",
"Paolo",
""
]
] | We present state-of-the-art predictions for transverse observables relevant to colour-singlet production at the LHC, in particular the transverse momentum of the colour singlet in gluon-fusion Higgs production and in neutral Drell-Yan lepton-pair production, as well as the $\phi^*_\eta$ observable in Drell Yan. We perform a next-to-next-to-next-to-leading logarithmic (N$^3$LL) resummation of such observables in momentum space according to the RadISH formalism, consistently including in our prediction all constant terms of relative order $\alpha_s^3$ with respect to the Born, thereby achieving N$^3$LL$^\prime$ accuracy. The calculation is fully exclusive with respect to the Born kinematics, which allows the application of arbitrary fiducial selection cuts on the decay products of the colour singlet. We supplement our results with a transverse-recoil prescription, accounting for dominant classes of subleading-power corrections in a fiducial setup. The resummed predictions are matched with fixed-order differential spectra at next-to-next-to-leading order (NNLO) accuracy. A phenomenological comparison is carried out with 13 TeV LHC data relevant to the Higgs to di-photon channel, as well as to neutral Drell-Yan lepton-pair production. Overall, the inclusion of ${\cal O}(\alpha_s^3)$ constant terms, and to a lesser extent of transverse-recoil effects, proves beneficial for the comparison of theoretical predictions to data, leaving a residual theoretical uncertainty in the resummation region at the 2-5% level for Drell-Yan observables, and 5-7% in Higgs production. |
hep-ph/0204196 | Kazuhiro Tobe | Kazuhiro Tobe and James D. Wells | Higgs boson mass limits in perturbative unification theories | 20 pages, latex, 6 figures, references added | Phys.Rev.D66:013010,2002 | 10.1103/PhysRevD.66.013010 | null | hep-ph | null | Motivated in part by recent demonstrations that electroweak unification into
a simple group may occur at a low scale, we detail the requirements on the
Higgs mass if the unification is to be perturbative. We do this for the
Standard Model effective theory, minimal supersymmetry, and next-to-minimal
supersymmetry with an additional singlet field. Within the Standard Model
framework, we find that perturbative unification with sin2(thetaW)=1/4 occurs
at Lambda=3.8 TeV and requires mh<460 GeV, whereas perturbative unification
with sin2(thetaW)=3/8 requires mh<200 GeV. In supersymmetry, the presentation
of the Higgs mass predictions can be significantly simplified, yet remain
meaningful, by using a single supersymmetry breaking parameter Delta_S. We
present Higgs mass limits in terms of Delta_S for the minimal supersymmetric
model and the next-to-minimal supersymmetric model. We show that in
next-to-minimal supersymmetry, the Higgs mass upper limit can be as large as
500 GeV even for moderate supersymmetry masses if the perturbative unification
scale is low (e.g., Lambda=10 TeV).
| [
{
"created": "Tue, 16 Apr 2002 22:41:30 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Apr 2002 19:14:16 GMT",
"version": "v2"
}
] | 2009-11-19 | [
[
"Tobe",
"Kazuhiro",
""
],
[
"Wells",
"James D.",
""
]
] | Motivated in part by recent demonstrations that electroweak unification into a simple group may occur at a low scale, we detail the requirements on the Higgs mass if the unification is to be perturbative. We do this for the Standard Model effective theory, minimal supersymmetry, and next-to-minimal supersymmetry with an additional singlet field. Within the Standard Model framework, we find that perturbative unification with sin2(thetaW)=1/4 occurs at Lambda=3.8 TeV and requires mh<460 GeV, whereas perturbative unification with sin2(thetaW)=3/8 requires mh<200 GeV. In supersymmetry, the presentation of the Higgs mass predictions can be significantly simplified, yet remain meaningful, by using a single supersymmetry breaking parameter Delta_S. We present Higgs mass limits in terms of Delta_S for the minimal supersymmetric model and the next-to-minimal supersymmetric model. We show that in next-to-minimal supersymmetry, the Higgs mass upper limit can be as large as 500 GeV even for moderate supersymmetry masses if the perturbative unification scale is low (e.g., Lambda=10 TeV). |
1701.06737 | Jugal Lahkar | Jugal Lahkar, D.K.Choudhury, S.Roy and N.S.Bordoloi | A model of mesons in finite extra-dimension | null | null | 10.1139/cjp-2017-0658 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently,problem of stability of H-atom has been reported in extra-finite
dimension,and found out that it is stable in extra-finite dimension of
size,$R\leq\frac{a_0}{4}$,where,$a_0$ is the Bohr radius.Assuming that,the
heavy flavoured mesons have also such stability controlled by the scale of
coupling constant,we obtain corresponding QCD Bohr radius and it is found to be
well within the present theoretical and experimental limit of higher
dimension.We then study its consequences in their masses using effective string
inspired potential model in higher dimension pursued by us.Within the
uncertainty of masses of known Heavy Flavoured mesons the allowed range of
extra dimension is $L\leq10^{-16}m$,which is well below the present theoretical
and experimental limit,and far above the Planck length
$\simeq1.5\times10^{-35}$ m.
| [
{
"created": "Tue, 24 Jan 2017 05:58:14 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Feb 2019 09:24:49 GMT",
"version": "v2"
}
] | 2019-02-07 | [
[
"Lahkar",
"Jugal",
""
],
[
"Choudhury",
"D. K.",
""
],
[
"Roy",
"S.",
""
],
[
"Bordoloi",
"N. S.",
""
]
] | Recently,problem of stability of H-atom has been reported in extra-finite dimension,and found out that it is stable in extra-finite dimension of size,$R\leq\frac{a_0}{4}$,where,$a_0$ is the Bohr radius.Assuming that,the heavy flavoured mesons have also such stability controlled by the scale of coupling constant,we obtain corresponding QCD Bohr radius and it is found to be well within the present theoretical and experimental limit of higher dimension.We then study its consequences in their masses using effective string inspired potential model in higher dimension pursued by us.Within the uncertainty of masses of known Heavy Flavoured mesons the allowed range of extra dimension is $L\leq10^{-16}m$,which is well below the present theoretical and experimental limit,and far above the Planck length $\simeq1.5\times10^{-35}$ m. |
1511.07301 | Keith Thrasher | Aria R. Johansen, Marc Sher, Keith Thrasher | The Lee-Wick Extension of the Two-Higgs Doublet Model | 13 pages, 5 figures, Version to be published in Physical Review D | Phys. Rev. D 93, 015019 (2016) | 10.1103/PhysRevD.93.015019 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Lee-Wick Standard Model is a highly constrained model which solves the
gauge hierarchy problem at the expense of including states with negative norm.
It appears to be macroscopically causal and consistent. This model is extended
by considering the two-Higgs doublet extension of the Lee-Wick model. Rewriting
the Lagrangian using auxiliary fields introduces two additional doublets of
Lee-Wick partners. The model is highly constrained, with only one or two
additional parameters beyond that of the usual two-Higgs doublet model, and yet
there are four doublets. Mass relations are established by diagonalizing the
mass matrices and further constraints are established by studying results from
B --> tau nu, neutral B-meson mixing, and B --> X_s gamma. The prospects of
detecting evidence for this model at the LHC are discussed.
| [
{
"created": "Mon, 23 Nov 2015 16:30:00 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Dec 2015 17:00:03 GMT",
"version": "v2"
},
{
"created": "Fri, 8 Jan 2016 00:53:06 GMT",
"version": "v3"
}
] | 2016-02-03 | [
[
"Johansen",
"Aria R.",
""
],
[
"Sher",
"Marc",
""
],
[
"Thrasher",
"Keith",
""
]
] | The Lee-Wick Standard Model is a highly constrained model which solves the gauge hierarchy problem at the expense of including states with negative norm. It appears to be macroscopically causal and consistent. This model is extended by considering the two-Higgs doublet extension of the Lee-Wick model. Rewriting the Lagrangian using auxiliary fields introduces two additional doublets of Lee-Wick partners. The model is highly constrained, with only one or two additional parameters beyond that of the usual two-Higgs doublet model, and yet there are four doublets. Mass relations are established by diagonalizing the mass matrices and further constraints are established by studying results from B --> tau nu, neutral B-meson mixing, and B --> X_s gamma. The prospects of detecting evidence for this model at the LHC are discussed. |
1208.2203 | Kazem Azizi | K. Azizi, S. Kartal, A. T. Olgun, Z. Tavukoglu | Comparative analysis of the semileptonic $\Lambda_b \rightarrow \Lambda
\ell^+ \ell^-$ transition in SM and different SUSY scenarios using form
factors from full QCD | 23 Pages, 8 Figures and 11 Tables | null | 10.1007/JHEP10(2012)118 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We work out the semileptonic $\Lambda_b\rightarrow \Lambda \ell^+ \ell^-$
transition in standard as well as different supersymmetric models. In
particular, considering the parametrization of the matrix elements entered the
low energy effective Hamiltonian in terms of form factors in full QCD, we
calculate the amplitude and differential decay rate responsible for this decay
channel in supersymmetric models. We then use the form factors calculated via
light cone QCD sum rules in full theory to analyze the differential branching
ratio and lepton forward-backward asymmetry of this decay channel in different
supersymmetric models and compare the obtained results with those of the
standard model. We also discuss how the results of different supersymmetric
models deviate from the standard model predictions and which SUSY scenarios are
favored.
| [
{
"created": "Fri, 10 Aug 2012 15:22:53 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Sep 2012 15:55:07 GMT",
"version": "v2"
}
] | 2015-06-11 | [
[
"Azizi",
"K.",
""
],
[
"Kartal",
"S.",
""
],
[
"Olgun",
"A. T.",
""
],
[
"Tavukoglu",
"Z.",
""
]
] | We work out the semileptonic $\Lambda_b\rightarrow \Lambda \ell^+ \ell^-$ transition in standard as well as different supersymmetric models. In particular, considering the parametrization of the matrix elements entered the low energy effective Hamiltonian in terms of form factors in full QCD, we calculate the amplitude and differential decay rate responsible for this decay channel in supersymmetric models. We then use the form factors calculated via light cone QCD sum rules in full theory to analyze the differential branching ratio and lepton forward-backward asymmetry of this decay channel in different supersymmetric models and compare the obtained results with those of the standard model. We also discuss how the results of different supersymmetric models deviate from the standard model predictions and which SUSY scenarios are favored. |
1609.00297 | Toshinori Matsui | Katsuya Hashino, Mitsuru Kakizaki, Shinya Kanemura, Pyungwon Ko,
Toshinori Matsui | Gravitational waves and Higgs boson couplings for exploring first order
phase transition in the model with a singlet scalar field | 15 pages, 2 figures | null | 10.1016/j.physletb.2016.12.052 | UT-HET-117, KIAS-P16065 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the spectrum of gravitational waves originated from strongly
first order electroweak phase transition in the extended Higgs model with a
real singlet field. In order to calculate the bubble nucleation rate, we
perform a two-field analysis to evaluate bounce solutions connecting the true
and the false vacua using the one-loop effective potential at finite
temperatures. Imposing the Sakharov condition of the departure from thermal
equilibrium for baryogenesis, we survey allowed regions of parameters of the
model. We then investigate the gravitational waves produced at electroweak
bubble collisions in the early Universe, such as the sound wave, the bubble
wall collision and the plasma turbulence. We find that the strength at the peak
frequency can be large enough to be detected at future space-based
gravitational interferometers such as eLISA, DECIGO and BBO. Predicted
deviations in the various Higgs boson couplings are also evaluated at the zero
temperature, and are shown to be large enough too. Therefore, in this model
strongly first order electroweak phase transition can be tested by the
combination of the precision study of various Higgs boson couplings at LHC, the
measurement of the triple Higgs boson coupling at future lepton colliders and
the shape of the spectrum of gravitational wave detectable at future
gravitational interferometers.
| [
{
"created": "Thu, 1 Sep 2016 16:06:40 GMT",
"version": "v1"
}
] | 2017-01-04 | [
[
"Hashino",
"Katsuya",
""
],
[
"Kakizaki",
"Mitsuru",
""
],
[
"Kanemura",
"Shinya",
""
],
[
"Ko",
"Pyungwon",
""
],
[
"Matsui",
"Toshinori",
""
]
] | We calculate the spectrum of gravitational waves originated from strongly first order electroweak phase transition in the extended Higgs model with a real singlet field. In order to calculate the bubble nucleation rate, we perform a two-field analysis to evaluate bounce solutions connecting the true and the false vacua using the one-loop effective potential at finite temperatures. Imposing the Sakharov condition of the departure from thermal equilibrium for baryogenesis, we survey allowed regions of parameters of the model. We then investigate the gravitational waves produced at electroweak bubble collisions in the early Universe, such as the sound wave, the bubble wall collision and the plasma turbulence. We find that the strength at the peak frequency can be large enough to be detected at future space-based gravitational interferometers such as eLISA, DECIGO and BBO. Predicted deviations in the various Higgs boson couplings are also evaluated at the zero temperature, and are shown to be large enough too. Therefore, in this model strongly first order electroweak phase transition can be tested by the combination of the precision study of various Higgs boson couplings at LHC, the measurement of the triple Higgs boson coupling at future lepton colliders and the shape of the spectrum of gravitational wave detectable at future gravitational interferometers. |
1905.03311 | David Shih | Pouya Asadi and David Shih | Maximizing the Impact of New Physics in $b\rightarrow c \tau \nu$
Anomalies | 18 pages, 3 figures | Phys. Rev. D 100, 115013 (2019) | 10.1103/PhysRevD.100.115013 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We develop a rigorous, semi-analytical method for maximizing any $b\to
c\tau\nu$ observable in the full 20-real-dimensional parameter space of the
dimension 6 effective Hamiltonian, given some fixed values of $R_{D^{(*)}}$. We
apply our method to find the maximum allowed values of $F^L_{D^*}$ and
$R_{J/\psi}$, two observables which have both come out higher than their SM
predictions in recent measurements by the Belle and LHCb collaborations. While
the measurements still have large error bars, they add to the existing
$R_{D^{(*)}}$ anomaly, and it is worthwhile to consider NP explanations. It has
been shown that none of the existing, minimal models in the literature can
explain the observed values of $F^L_{D^*}$ and $R_{J/\psi}$. Using our method,
we will generalize beyond the minimal models and show that there is no
combination of dimension 6 Wilson operators that can come within $1\sigma$ of
the observed $R_{J/\psi}$ value. By contrast, we will show that the observed
value of $F^L_{D^*}$ can be achieved, but only with sizable contributions from
tensor and mixed-chirality vector Wilson coefficients.
| [
{
"created": "Wed, 8 May 2019 19:59:44 GMT",
"version": "v1"
}
] | 2019-12-11 | [
[
"Asadi",
"Pouya",
""
],
[
"Shih",
"David",
""
]
] | We develop a rigorous, semi-analytical method for maximizing any $b\to c\tau\nu$ observable in the full 20-real-dimensional parameter space of the dimension 6 effective Hamiltonian, given some fixed values of $R_{D^{(*)}}$. We apply our method to find the maximum allowed values of $F^L_{D^*}$ and $R_{J/\psi}$, two observables which have both come out higher than their SM predictions in recent measurements by the Belle and LHCb collaborations. While the measurements still have large error bars, they add to the existing $R_{D^{(*)}}$ anomaly, and it is worthwhile to consider NP explanations. It has been shown that none of the existing, minimal models in the literature can explain the observed values of $F^L_{D^*}$ and $R_{J/\psi}$. Using our method, we will generalize beyond the minimal models and show that there is no combination of dimension 6 Wilson operators that can come within $1\sigma$ of the observed $R_{J/\psi}$ value. By contrast, we will show that the observed value of $F^L_{D^*}$ can be achieved, but only with sizable contributions from tensor and mixed-chirality vector Wilson coefficients. |
hep-ph/0105093 | Konstantin Chetyrkin | K.G. Chetyrkin and A.A. Pivovarov (Institute for Nuclear Research of
the Academy of Sciences of Russian Federation) | Vacuum Saturation Hypothesis and QCD Sum Rules | submitted to make it easier accessible for an interested reader | Nuovo Cim.A100:899-906,1988 | 10.1007/BF02789008 | null | hep-ph | null | The accuracy of the vacuum saturation hypothesis is discussed using the
examples of vacuum expectation values of four-quark operators and the parameter
$B$, which determines the short-distance contribution to the $K^0 - \bar K^0$
mixing. Note added: The approach based on sum rules in position (x-)space as
elaborated in the paper is relevant and useful tool for the current
phenomenology. In particular, it provides the unique possibility of direct
non-perturbative estimation of the VEV's of four-quark operators renormalized
in any scheme, including the MSbar one.
| [
{
"created": "Thu, 10 May 2001 16:23:55 GMT",
"version": "v1"
}
] | 2010-11-01 | [
[
"Chetyrkin",
"K. G.",
"",
"Institute for Nuclear Research of\n the Academy of Sciences of Russian Federation"
],
[
"Pivovarov",
"A. A.",
"",
"Institute for Nuclear Research of\n the Academy of Sciences of Russian Federation"
]
] | The accuracy of the vacuum saturation hypothesis is discussed using the examples of vacuum expectation values of four-quark operators and the parameter $B$, which determines the short-distance contribution to the $K^0 - \bar K^0$ mixing. Note added: The approach based on sum rules in position (x-)space as elaborated in the paper is relevant and useful tool for the current phenomenology. In particular, it provides the unique possibility of direct non-perturbative estimation of the VEV's of four-quark operators renormalized in any scheme, including the MSbar one. |
1112.2190 | Enrico Bertuzzo Dr | Enrico Bertuzzo, Marco Farina | Detecting the Higgs boson(s) in LambdaSUSY | 9 pages, 2 figures | null | 10.1140/epjc/s10052-012-2054-6 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We reconsider the Higgs bosons discovery potential in the LambdaSUSY
framework, in which the masses of the scalar particles are increased already at
tree level via a largish supersymmetric coupling between the usual Higgs
doublets and a Singlet. We analyze in particular the interplay between the
discovery potential of the lightest and of the next-to-lightest scalar, finding
that the decay modes of the latter should be more easily detected at the LHC.
| [
{
"created": "Fri, 9 Dec 2011 19:39:05 GMT",
"version": "v1"
}
] | 2012-06-28 | [
[
"Bertuzzo",
"Enrico",
""
],
[
"Farina",
"Marco",
""
]
] | We reconsider the Higgs bosons discovery potential in the LambdaSUSY framework, in which the masses of the scalar particles are increased already at tree level via a largish supersymmetric coupling between the usual Higgs doublets and a Singlet. We analyze in particular the interplay between the discovery potential of the lightest and of the next-to-lightest scalar, finding that the decay modes of the latter should be more easily detected at the LHC. |
hep-ph/0512062 | Norma Mankoc Borstnik | Anamarija Borstnik Bracic, Norma Susana Mankoc Borstnik | On the origin of families of fermions and their mass matrices | 34 pages, Revtex 4 | Phys.Rev. D74 (2006) 073013 | 10.1103/PhysRevD.74.073013 | null | hep-ph | null | We are proposing a new way of describing families of quarks and leptons,
using the approach unifying all the internal degrees of freedom, proposed by
one of us. Spinors, living in d(=1+13)-dimensional space, carry in this
approach only the spin and interact with only the gravity through vielbeins and
two kinds of the spin connection fields - the gauge fields of the Poincare
group and the second kind of the Clifford algebra objects. All the quarks and
the leptons of one family appear in one Weyl representation of a chosen
handedness of the Lorentz group, if analyzed with respect to the Standard model
gauge groups: the right handed (with respect to SO(1,3)) weak chargeless quarks
and leptons and the left handed weak charged quark and leptons. A part of the
starting Lagrange density of a Weyl spinor in d=1+13 transforms right handed
quarks and leptons into left handed quarks and leptons manifesting as the
Yukawa couplings of the Standard model. The second kind of Clifford algebra
objects generates families and contributes to diagonal and off diagonal Yukawa
couplings. The approach predicts an even number of families, treating leptons
and quarks equivalently. In this paper we investigate within this approach the
appearance of the Yukawa couplings within one family of quarks and leptons as
well as among the families (without assuming any Higgs fields). We present the
mass matrices for four families and investigate whether our way of generating
families might explain the origin of families of quarks and leptons as well as
their observed properties - the masses and the mixing matrices. Numerical
results are presented in the paper following this one.
| [
{
"created": "Mon, 5 Dec 2005 10:45:11 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Jun 2006 13:47:45 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Bracic",
"Anamarija Borstnik",
""
],
[
"Borstnik",
"Norma Susana Mankoc",
""
]
] | We are proposing a new way of describing families of quarks and leptons, using the approach unifying all the internal degrees of freedom, proposed by one of us. Spinors, living in d(=1+13)-dimensional space, carry in this approach only the spin and interact with only the gravity through vielbeins and two kinds of the spin connection fields - the gauge fields of the Poincare group and the second kind of the Clifford algebra objects. All the quarks and the leptons of one family appear in one Weyl representation of a chosen handedness of the Lorentz group, if analyzed with respect to the Standard model gauge groups: the right handed (with respect to SO(1,3)) weak chargeless quarks and leptons and the left handed weak charged quark and leptons. A part of the starting Lagrange density of a Weyl spinor in d=1+13 transforms right handed quarks and leptons into left handed quarks and leptons manifesting as the Yukawa couplings of the Standard model. The second kind of Clifford algebra objects generates families and contributes to diagonal and off diagonal Yukawa couplings. The approach predicts an even number of families, treating leptons and quarks equivalently. In this paper we investigate within this approach the appearance of the Yukawa couplings within one family of quarks and leptons as well as among the families (without assuming any Higgs fields). We present the mass matrices for four families and investigate whether our way of generating families might explain the origin of families of quarks and leptons as well as their observed properties - the masses and the mixing matrices. Numerical results are presented in the paper following this one. |
hep-ph/9210270 | Daniel Ng | Paul H. Frampton, Daniel Ng, Marc Sher and Yao Yuan | Search for Heavy Leptons at Hadron Colliders | 17 pages(8 figures are not included),TRI-PP-92-97 | Phys.Rev.D48:3128-3135,1993 | 10.1103/PhysRevD.48.3128 | null | hep-ph | null | Four models are considered which contain heavy leptons beyond the three
families of the standard model. Two are fourth-generation extensions of the
standard model in which the right-handed heavy leptons are either isosinglets
or in an isodoublet; the other two are motivated by the aspon model of CP
violation. In all these models, the heavy neutrino can either be heavier than,
or comparable in mass to, the charged lepton leading to the possibility that
the charged lepton is very long-lived. Production cross section and signatures
for the heavy leptons are computed for the SSC and LHC.
| [
{
"created": "Wed, 28 Oct 1992 19:08:53 GMT",
"version": "v1"
}
] | 2010-11-01 | [
[
"Frampton",
"Paul H.",
""
],
[
"Ng",
"Daniel",
""
],
[
"Sher",
"Marc",
""
],
[
"Yuan",
"Yao",
""
]
] | Four models are considered which contain heavy leptons beyond the three families of the standard model. Two are fourth-generation extensions of the standard model in which the right-handed heavy leptons are either isosinglets or in an isodoublet; the other two are motivated by the aspon model of CP violation. In all these models, the heavy neutrino can either be heavier than, or comparable in mass to, the charged lepton leading to the possibility that the charged lepton is very long-lived. Production cross section and signatures for the heavy leptons are computed for the SSC and LHC. |
hep-ph/0412071 | Vladimir Dzhunushaliev | Vladimir Dzhunushaliev, Douglas Singleton and Tatyana Nikulicheva | Nonperturbative calculations in SU(3) gauge theory | 3 pages, 2 figs, talk given at "Quark Confinement and Hadron
Spectrum-2004" | null | 10.1063/1.1920976 | null | hep-ph | null | An approximate technique for performing nonperturbative calculations in
quantum SU(3) gauge theory is presented. One aspect of this nonperturbative
method is the breaking down $SU(3) \to SU(2) + coset$. The procedure also uses
some aspects of an old method by Heisenberg to calculate the n-point Green's
function of strongly interacting, non-linear fields. Using these ideas we give
approximate calculations of the 2 and 4-points Green's functions.
| [
{
"created": "Mon, 6 Dec 2004 04:28:02 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Dzhunushaliev",
"Vladimir",
""
],
[
"Singleton",
"Douglas",
""
],
[
"Nikulicheva",
"Tatyana",
""
]
] | An approximate technique for performing nonperturbative calculations in quantum SU(3) gauge theory is presented. One aspect of this nonperturbative method is the breaking down $SU(3) \to SU(2) + coset$. The procedure also uses some aspects of an old method by Heisenberg to calculate the n-point Green's function of strongly interacting, non-linear fields. Using these ideas we give approximate calculations of the 2 and 4-points Green's functions. |
1411.6456 | A. Tureanu | L.V. Laperashvili, H.B. Nielsen and A. Tureanu | Standard Model and Graviweak Unification with (Super)Renormalizable
Gravity. Part I: Visible and Invisible Sectors of the Universe | 27 pages | null | 10.1142/S0217751X1550044X | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We develop a self-consistent $Spin(4,4)$-invariant model of the unification
of gravity with weak $SU(2)$ gauge and Higgs fields in the visible and
invisible sectors of our Universe. We consider a general case of the graviweak
unification, including the higher-derivative super-renormalizable theory of
gravity, which is a unitary, asymptotically-free and perturbatively consistent
theory of the quantum gravity.
| [
{
"created": "Mon, 24 Nov 2014 14:13:03 GMT",
"version": "v1"
}
] | 2015-06-23 | [
[
"Laperashvili",
"L. V.",
""
],
[
"Nielsen",
"H. B.",
""
],
[
"Tureanu",
"A.",
""
]
] | We develop a self-consistent $Spin(4,4)$-invariant model of the unification of gravity with weak $SU(2)$ gauge and Higgs fields in the visible and invisible sectors of our Universe. We consider a general case of the graviweak unification, including the higher-derivative super-renormalizable theory of gravity, which is a unitary, asymptotically-free and perturbatively consistent theory of the quantum gravity. |
1510.01999 | Ursula Laa | Ursula Laa | Interpreting LHC searches for new physics with SModelS | 6 pages, 5 figures. To appear in the proceedings of the European
Physical Society Conference on High Energy Physics 2015 (EPS-HEP 2015),
Vienna, Austria, 22nd to 29th of July 2015 | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | ATLAS and CMS have performed a large number of searches for physics beyond
the Standard Model (BSM). The results are typically presented in the context of
Simplified Model Spectra (SMS), containing only a few new particles with fixed
decay branching ratios, yielding generic upper limits on the cross section as a
function of particle masses. The interpretation of these limits within
realistic BSM scenarios is non-trivial and best done by automated computational
tools. To this end we have developed SModelS, a public tool that can test any
given BSM model with a $\mathbb{Z}_2$ symmetry by decomposing it into its SMS
components and confronting them with a large database of SMS results. This
allows to easily evaluate the main LHC constraints on the model. Additionally,
SModelS returns information on important signatures that are not covered by the
existing SMS results. This may be used to improve the coverage of BSM searches
and SMS interpretations. We present the working principle of SModelS, in
particular the decomposition procedure, the database and matching of applicable
experimental results. Moreover, we present applications of SModelS to different
models: the MSSM, a model with a sneutrino as the lightest supersymmetric
particle and the UMSSM. These results illustrate how SModelS can be used to
identify important constraints, untested regions and interesting new
signatures.
| [
{
"created": "Wed, 7 Oct 2015 15:59:23 GMT",
"version": "v1"
}
] | 2015-10-08 | [
[
"Laa",
"Ursula",
""
]
] | ATLAS and CMS have performed a large number of searches for physics beyond the Standard Model (BSM). The results are typically presented in the context of Simplified Model Spectra (SMS), containing only a few new particles with fixed decay branching ratios, yielding generic upper limits on the cross section as a function of particle masses. The interpretation of these limits within realistic BSM scenarios is non-trivial and best done by automated computational tools. To this end we have developed SModelS, a public tool that can test any given BSM model with a $\mathbb{Z}_2$ symmetry by decomposing it into its SMS components and confronting them with a large database of SMS results. This allows to easily evaluate the main LHC constraints on the model. Additionally, SModelS returns information on important signatures that are not covered by the existing SMS results. This may be used to improve the coverage of BSM searches and SMS interpretations. We present the working principle of SModelS, in particular the decomposition procedure, the database and matching of applicable experimental results. Moreover, we present applications of SModelS to different models: the MSSM, a model with a sneutrino as the lightest supersymmetric particle and the UMSSM. These results illustrate how SModelS can be used to identify important constraints, untested regions and interesting new signatures. |
hep-ph/0503041 | Mikhail Braun | M.A.Braun | On the initial condition for evolution of the perturbative QCD Pomeron
in the nucleus | 5 pages in LaTex | Theor.Math.Phys. 148 (2006) 923-927; Teor.Mat.Fiz. 148 (2006)
57-63 | 10.1007/s11232-006-0088-3 | null | hep-ph | null | It is shown that subdominant terms found in the reggeized gluon diagram
technique, to be added to Pomeron fan diagrams with the 3P interaction, can be
exactly taken into account by taking the initial condition for evolution in the
Glauber form. This demonstrates complete equivalence of the dipole picture and
the reggeized gluon approach not only on the leading level but also on the
subleading level.
| [
{
"created": "Fri, 4 Mar 2005 07:11:56 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Braun",
"M. A.",
""
]
] | It is shown that subdominant terms found in the reggeized gluon diagram technique, to be added to Pomeron fan diagrams with the 3P interaction, can be exactly taken into account by taking the initial condition for evolution in the Glauber form. This demonstrates complete equivalence of the dipole picture and the reggeized gluon approach not only on the leading level but also on the subleading level. |
2207.00754 | Mohd Siddique Akbar Alam Khan | B. Ananthanarayan, Diganta Das and M. S. A. Alam Khan | Renormalization group improved $m_s$ and $\vert V_{us}\vert$
determination from hadronic $\tau$ decays | References added, tables corrected. Versin published in PhysRevD | null | 10.1103/PhysRevD.106.114036 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We determine the strange quark mass ($m_s$) and quark mixing element $\vert
V_{us}\vert $, and their joint determination from the Cabibbo suppressed
hadronic $\tau$ decays in various perturbative schemes. Compared to the
previous analysis based on the optimal renormalization or the renormalization
group summed perturbation theory (RGSPT) scheme, we have improved this analysis
by replacing the theoretical longitudinal contributions with phenomenological
parametrization, and the RGSPT coefficients are used for the dimension-4 Adler
functions. The improved analysis results in the extraction of
$m_s(2\,\mathrm{GeV})=98\pm19\,\mathrm{MeV}$ and $\vert
V_{us}\vert=0.2191\pm0.0043$ from the RGSPT scheme.
| [
{
"created": "Sat, 2 Jul 2022 06:41:52 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Jul 2022 17:07:01 GMT",
"version": "v2"
},
{
"created": "Sat, 16 Sep 2023 05:06:36 GMT",
"version": "v3"
}
] | 2023-09-19 | [
[
"Ananthanarayan",
"B.",
""
],
[
"Das",
"Diganta",
""
],
[
"Khan",
"M. S. A. Alam",
""
]
] | We determine the strange quark mass ($m_s$) and quark mixing element $\vert V_{us}\vert $, and their joint determination from the Cabibbo suppressed hadronic $\tau$ decays in various perturbative schemes. Compared to the previous analysis based on the optimal renormalization or the renormalization group summed perturbation theory (RGSPT) scheme, we have improved this analysis by replacing the theoretical longitudinal contributions with phenomenological parametrization, and the RGSPT coefficients are used for the dimension-4 Adler functions. The improved analysis results in the extraction of $m_s(2\,\mathrm{GeV})=98\pm19\,\mathrm{MeV}$ and $\vert V_{us}\vert=0.2191\pm0.0043$ from the RGSPT scheme. |
2207.06898 | Brian Batell | Brian Batell, Joshua Berger, Vedran Brdar, Alan D. Bross, Janet M.
Conrad, Patrick deNiverville, Valentina De Romeri, Bhaskar Dutta, Saeid
Foroughi-Abari, Matheus Hostert, Joshua Isaacson, Ahmed Ismail, Sudip Jana,
Wooyoung Jang, Nicholas W. Kamp, Kevin J. Kelly, Doojin Kim, Felix Kling,
Mathieu Lamoureux, David McKeen, Jong-Chul Park, Gianluca Petrillo, Adam
Ritz, Seodong Shin, Tyler B. Smith, Sebastian Trojanowski, Yu-Dai Tsai,
Yun-Tse Tsai, Richard Van de Water, Jason Wyenberg, Guang Yang, Jaehoon Yu | Dark Sector Studies with Neutrino Beams | 66 pages, 24 figures, 6 tables; Contribution to Snowmass 2021; v2:
minor changes, references added | null | null | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | An array of powerful neutrino-beam experiments will study the fundamental
properties of neutrinos with unprecedented precision in the coming years. Along
with their primary neutrino-physics motivations, there has been growing
recognition that these experiments can carry out a rich program of searches for
new, light, weakly-coupled particles that are part of a dark sector. In this
white paper, we review the diverse theoretical motivations for dark sectors and
the capabilities of neutrino beam experiments to probe a wide range of models
and signatures. We also examine the potential obstacles that could limit these
prospects and identify concrete steps needed to realize an impactful dark
sector search program in this and coming decades.
| [
{
"created": "Thu, 14 Jul 2022 13:26:45 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Sep 2022 16:00:12 GMT",
"version": "v2"
}
] | 2022-09-07 | [
[
"Batell",
"Brian",
""
],
[
"Berger",
"Joshua",
""
],
[
"Brdar",
"Vedran",
""
],
[
"Bross",
"Alan D.",
""
],
[
"Conrad",
"Janet M.",
""
],
[
"deNiverville",
"Patrick",
""
],
[
"De Romeri",
"Valentina",
""
... | An array of powerful neutrino-beam experiments will study the fundamental properties of neutrinos with unprecedented precision in the coming years. Along with their primary neutrino-physics motivations, there has been growing recognition that these experiments can carry out a rich program of searches for new, light, weakly-coupled particles that are part of a dark sector. In this white paper, we review the diverse theoretical motivations for dark sectors and the capabilities of neutrino beam experiments to probe a wide range of models and signatures. We also examine the potential obstacles that could limit these prospects and identify concrete steps needed to realize an impactful dark sector search program in this and coming decades. |
1307.2880 | Phongpichit Channuie | Phongpichit Channuie (Walailak U.) and Khamphee Karwan (IF & THEP) | Composite Inflation confronts BICEP2 and PLANCK | v4. title changed reflecting the recent BICEP2 results, 25 pages, 7
figures, references added | JCAP 1406 (2014) 045 | 10.1088/1475-7516/2014/06/045 | null | hep-ph astro-ph.CO gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine observational constraints on single-field inflation in which the
inflaton is a composite field stemming from a four-dimensional strongly
interacting field theory. We confront the predictions with the Planck and very
recent BICEP2 data. In the large non-minimal coupling regions, we discover for
MCI model that the predictions lie well inside the joint $68\%$ CL for the
Planck data, but is in tension with the recent BICEP2 observations. In the case
of the GI model, the predictions satisfy the Planck results. However, this
model can produce a large tensor-to-scalar ratio consistent with the recent
BICEP2 observations if the number of e-foldings is slightly smaller than the
range commonly used. For a super Yang-Mills paradigm, we discover that the
predictions satisfy the Planck data, and surprisingly a large tensor-to-scalar
ratio consistent with the BICEP2 results can also be produced for an acceptable
range of the number of e-foldings and of the confining scale. In the small
non-minimal coupling regions, all of the models can satisfy the BICEP2 results.
However, the predictions of GI and SgbI models cannot satisfy the observational
bound on the amplitude of the curvature perturbation launched by Planck, and
the techni-inflaton self-coupling in the MCI model is constrained to be
extremely small.
| [
{
"created": "Wed, 10 Jul 2013 19:02:24 GMT",
"version": "v1"
},
{
"created": "Sun, 4 Aug 2013 09:39:57 GMT",
"version": "v2"
},
{
"created": "Thu, 3 Oct 2013 16:23:25 GMT",
"version": "v3"
},
{
"created": "Sat, 5 Apr 2014 12:30:54 GMT",
"version": "v4"
}
] | 2014-07-08 | [
[
"Channuie",
"Phongpichit",
"",
"Walailak U."
],
[
"Karwan",
"Khamphee",
"",
"IF & THEP"
]
] | We examine observational constraints on single-field inflation in which the inflaton is a composite field stemming from a four-dimensional strongly interacting field theory. We confront the predictions with the Planck and very recent BICEP2 data. In the large non-minimal coupling regions, we discover for MCI model that the predictions lie well inside the joint $68\%$ CL for the Planck data, but is in tension with the recent BICEP2 observations. In the case of the GI model, the predictions satisfy the Planck results. However, this model can produce a large tensor-to-scalar ratio consistent with the recent BICEP2 observations if the number of e-foldings is slightly smaller than the range commonly used. For a super Yang-Mills paradigm, we discover that the predictions satisfy the Planck data, and surprisingly a large tensor-to-scalar ratio consistent with the BICEP2 results can also be produced for an acceptable range of the number of e-foldings and of the confining scale. In the small non-minimal coupling regions, all of the models can satisfy the BICEP2 results. However, the predictions of GI and SgbI models cannot satisfy the observational bound on the amplitude of the curvature perturbation launched by Planck, and the techni-inflaton self-coupling in the MCI model is constrained to be extremely small. |
1306.1193 | Francesco Giacosa | Florian Divotgey, Lisa Olbrich, and Francesco Giacosa | Phenomenology of axial-vector and pseudovector mesons: decays and mixing
in the kaonic sector | 14 pages, 4 tables; to appear in EPJA | null | 10.1140/epja/i2013-13135-3 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the decays of the lightest axial-vector and pseudovector mesons,
interpreted as quark-antiquark states, into a vector and a pseudoscalar meson.
We show that the quarkonium assignment delivers a good description of the
decays and allows also to make further testable predictions. In the kaonic
sector, the physical resonances $K_{1}(1270)$ and $K_{1}(1400)$ emerge as mixed
objects of an axial vector state $K_{1,A}$ and a pseudovector state $K_{1,B}$.
We determine the mixing angle as $\left\vert
\theta_{K}\right\vert=\left(33.6\pm4.3\right) ^{\circ}$, a value compatible
with previous studies but with a smaller uncertainty. This result may be
helpful for testing models beyond the Standard Model of particle physics in
which decays into the kaonic resonances $K_{1}(1270)$ and $K_{1}(1400)$ are
investigated.
| [
{
"created": "Wed, 5 Jun 2013 18:02:20 GMT",
"version": "v1"
},
{
"created": "Sat, 19 Oct 2013 07:47:15 GMT",
"version": "v2"
}
] | 2015-06-16 | [
[
"Divotgey",
"Florian",
""
],
[
"Olbrich",
"Lisa",
""
],
[
"Giacosa",
"Francesco",
""
]
] | We study the decays of the lightest axial-vector and pseudovector mesons, interpreted as quark-antiquark states, into a vector and a pseudoscalar meson. We show that the quarkonium assignment delivers a good description of the decays and allows also to make further testable predictions. In the kaonic sector, the physical resonances $K_{1}(1270)$ and $K_{1}(1400)$ emerge as mixed objects of an axial vector state $K_{1,A}$ and a pseudovector state $K_{1,B}$. We determine the mixing angle as $\left\vert \theta_{K}\right\vert=\left(33.6\pm4.3\right) ^{\circ}$, a value compatible with previous studies but with a smaller uncertainty. This result may be helpful for testing models beyond the Standard Model of particle physics in which decays into the kaonic resonances $K_{1}(1270)$ and $K_{1}(1400)$ are investigated. |
1001.2799 | Huaiyu Duan | Huaiyu Duan (LANL), George M. Fuller (UCSD) and Yong-Zhong Qian (UMN) | Collective Neutrino Oscillations | Submitted to Annual Review of Nuclear and Particle Science | Ann. Rev. Nucl. Part. Sci. 60:569 (2010) | 10.1146/annurev.nucl.012809.104524 | LA-UR 09-08309, INT-PUB 10-001 | hep-ph astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review the rich phenomena associated with neutrino flavor transformation
in the presence of neutrino self-coupling. Our exposition centers on three
collective neutrino oscillation scenarios: a simple bipolar neutrino system
that initially consists of mono-energetic electron neutrinos and antineutrinos;
a homogeneous and isotropic neutrino gas with multiple neutrino/antineutrino
species and continuous energy spectra; and a generic neutrino gas in an
anisotropic environment. We use each of these scenarios to illustrate key
facets of collective neutrino oscillations. We discuss the implications of
collective neutrino flavor oscillations for core collapse supernova physics and
for the prospects of obtaining fundamental neutrino properties, e.g., the
neutrino mass hierarchy and $\theta_{13}$ from a future observed supernova
neutrino signal.
| [
{
"created": "Sat, 16 Jan 2010 01:44:53 GMT",
"version": "v1"
}
] | 2011-02-02 | [
[
"Duan",
"Huaiyu",
"",
"LANL"
],
[
"Fuller",
"George M.",
"",
"UCSD"
],
[
"Qian",
"Yong-Zhong",
"",
"UMN"
]
] | We review the rich phenomena associated with neutrino flavor transformation in the presence of neutrino self-coupling. Our exposition centers on three collective neutrino oscillation scenarios: a simple bipolar neutrino system that initially consists of mono-energetic electron neutrinos and antineutrinos; a homogeneous and isotropic neutrino gas with multiple neutrino/antineutrino species and continuous energy spectra; and a generic neutrino gas in an anisotropic environment. We use each of these scenarios to illustrate key facets of collective neutrino oscillations. We discuss the implications of collective neutrino flavor oscillations for core collapse supernova physics and for the prospects of obtaining fundamental neutrino properties, e.g., the neutrino mass hierarchy and $\theta_{13}$ from a future observed supernova neutrino signal. |
1702.02726 | Ajay Kumar Rai | Zalak Shah and Ajay Kumar Rai | Excited state mass spectra of doubly heavy $\Xi$ baryons | 10 pages, 5 figures | Eur. Phys. J. C (2017) 77: 129 | 10.1140/epjc/s10052-017-4688-x | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, the mass spectra are obtained for doubly heavy $\Xi$ baryons,
namely, $\Xi_{cc}^{+}$, $\Xi_{cc}^{++}$, $\Xi_{bb}^{-}$, $\Xi_{bb}^{0}$,
$\Xi_{bc}^{0}$ and $\Xi_{bc}^{+}$. These baryons are consist of two heavy
quarks($cc$, $bb$ and $bc$) with a light($d$ or $u$) quark. The ground, radial
and orbital states are calculated in framework of Hypercentral constituent
quark model with coul- omb plus linear potential. Our outcomes are also
compared with other predictions, thus, the average possible range of excited
states masses of these $\Xi$ baryons can be determined. The study of the Regge
trajectories are performed in (n, $M^{2}$) and (J, $M^{2}$) planes and their
slopes and intercepts are also determined. Lastly, the ground state magnetic
moments of these doubly heavy baryons are also calculated.
| [
{
"created": "Thu, 9 Feb 2017 07:13:32 GMT",
"version": "v1"
}
] | 2017-03-01 | [
[
"Shah",
"Zalak",
""
],
[
"Rai",
"Ajay Kumar",
""
]
] | In this paper, the mass spectra are obtained for doubly heavy $\Xi$ baryons, namely, $\Xi_{cc}^{+}$, $\Xi_{cc}^{++}$, $\Xi_{bb}^{-}$, $\Xi_{bb}^{0}$, $\Xi_{bc}^{0}$ and $\Xi_{bc}^{+}$. These baryons are consist of two heavy quarks($cc$, $bb$ and $bc$) with a light($d$ or $u$) quark. The ground, radial and orbital states are calculated in framework of Hypercentral constituent quark model with coul- omb plus linear potential. Our outcomes are also compared with other predictions, thus, the average possible range of excited states masses of these $\Xi$ baryons can be determined. The study of the Regge trajectories are performed in (n, $M^{2}$) and (J, $M^{2}$) planes and their slopes and intercepts are also determined. Lastly, the ground state magnetic moments of these doubly heavy baryons are also calculated. |
hep-ph/0205197 | Rohini M. Godbole | R. M. Godbole, A. Grau and G. Pancheri | Total Cross-sections | 5 pages, LaTeX, 2 figures, talk presented by G. Pancheri at Photon -
2001, The International Conference on Structure and Interactions of Photons,
Ascona, Sept. 2-7,2001. To appear in the proceedings | null | 10.1142/9789812777157_0041 | IISc/CTS/04-02 | hep-ph | null | We examine the energy dependence of total cross-sections for photon processes
and discuss the QCD contribution to the rising behaviour
| [
{
"created": "Fri, 17 May 2002 15:58:55 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Godbole",
"R. M.",
""
],
[
"Grau",
"A.",
""
],
[
"Pancheri",
"G.",
""
]
] | We examine the energy dependence of total cross-sections for photon processes and discuss the QCD contribution to the rising behaviour |
hep-ph/9707354 | Alex Kagan | Alexander L. Kagan and Alexey A. Petrov | $\eta'$ production in B-decays: Standard Model vs. New Physics | 34 pgs, 4 tables, 9 figures | null | null | null | hep-ph | null | Standard model factorization can account for the large rate for $B^\pm \to
\eta' K^\pm$. The large rate for $B \to \eta' X_s$ is more problematic and
requires a ``cocktail'' solution. Individual contributions from factorization,
$b \to \eta' s g$, and ``intrinsic charm'' fall significantly short of the
observed rate. In contrast, the observed $\eta'$ yields are easily explained in
models with $B(b \to sg) \sim 15%$. Factorization can account for the entire
semi-inclusive $\eta'$ yield without violating rare decay constraints.
Implications for CP violation are discussed.
| [
{
"created": "Tue, 15 Jul 1997 23:39:43 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Jul 1997 03:45:33 GMT",
"version": "v2"
}
] | 2008-02-03 | [
[
"Kagan",
"Alexander L.",
""
],
[
"Petrov",
"Alexey A.",
""
]
] | Standard model factorization can account for the large rate for $B^\pm \to \eta' K^\pm$. The large rate for $B \to \eta' X_s$ is more problematic and requires a ``cocktail'' solution. Individual contributions from factorization, $b \to \eta' s g$, and ``intrinsic charm'' fall significantly short of the observed rate. In contrast, the observed $\eta'$ yields are easily explained in models with $B(b \to sg) \sim 15%$. Factorization can account for the entire semi-inclusive $\eta'$ yield without violating rare decay constraints. Implications for CP violation are discussed. |
1505.04645 | Anna Kaminska | Anna Kaminska | Improving LHC searches for strong EW symmetry breaking resonances | Talk presented at Rencontres de Moriond 2015 (EW interactions and
unified theories) | null | null | MITP/15-035 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Composite Higgs models generically predict the existence of heavy spin-1
resonances with the same quantum numbers as electroweak gauge bosons. The
effective lagrangian description of these resonances is presented, pointing out
the origin of their interactions with SM matter fields and the resulting LHC
phenomenology. Search strategies for spin-1 resonances are discussed,
mentioning possible advantages offered by boosted decay products. The impact of
interactions between spin-1 resonances and fermion resonances, crucial for the
proper interpretation of LHC searches, is pointed out.
| [
{
"created": "Mon, 18 May 2015 13:59:27 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Sep 2016 09:40:39 GMT",
"version": "v2"
}
] | 2016-09-06 | [
[
"Kaminska",
"Anna",
""
]
] | Composite Higgs models generically predict the existence of heavy spin-1 resonances with the same quantum numbers as electroweak gauge bosons. The effective lagrangian description of these resonances is presented, pointing out the origin of their interactions with SM matter fields and the resulting LHC phenomenology. Search strategies for spin-1 resonances are discussed, mentioning possible advantages offered by boosted decay products. The impact of interactions between spin-1 resonances and fermion resonances, crucial for the proper interpretation of LHC searches, is pointed out. |
hep-ph/0001183 | Michael R. Pennington | M.R. Pennington (Centre for Particle Theory, University of Durham,
U.K.) | Low Energy Hadron Physics | Invited introductory talk at the Workshop on Physics and Detectors
for DA$\Phi$NE, Frascati, November 16-19, 1999 | null | null | DTP-00/04 | hep-ph | null | Ask a group of particle theorists about low energy hadron physics and they
will say that this is a subject that belongs to the age of the dinosaurs.
However, it is GeV physics that controls the outcome of every hadronic
interaction at almost every energy. Confinement of quarks and gluons (and any
other super-constituents) means that it is the femto-universe that determines
what experiments detect.
What we have to learn at the start of the 21st century is discussed.
| [
{
"created": "Tue, 18 Jan 2000 15:04:48 GMT",
"version": "v1"
}
] | 2016-09-06 | [
[
"Pennington",
"M. R.",
"",
"Centre for Particle Theory, University of Durham,\n U.K."
]
] | Ask a group of particle theorists about low energy hadron physics and they will say that this is a subject that belongs to the age of the dinosaurs. However, it is GeV physics that controls the outcome of every hadronic interaction at almost every energy. Confinement of quarks and gluons (and any other super-constituents) means that it is the femto-universe that determines what experiments detect. What we have to learn at the start of the 21st century is discussed. |
2303.01652 | Parada Hutauruk T. P. | Parada T. P. Hutauruk, Seung-il Nam | Parton Distribution Functions for Pseudoscalar Mesons in the COnfining
Effective Chiral Quark Theory | 9 pages, 7 figures | Makara Journal of Science, 26/4 (2022), 296-303 | 10.7454/mss.v26i4.1402 | null | hep-ph nucl-th | http://creativecommons.org/licenses/by/4.0/ | This review paper presents the gluon, sea, and valence quark distributions of
the pseudoscalar (PS) mesons. The calculations of the parton structure of PS
mesons are performed using the Bethe-Salpeter equation-Nambu--Jona-Lasinio
(BSE-NJL) model, which offers a clear description of the dynamical chiral
symmetry breaking (D$\chi$SB) of the low-energy nonperturbative quantum
chromodynamics (QCD), with the help of the Schwinger proper-time regularization
scheme that simulates the color QCD confinement. Our results for the dynamical
quark mass -- which emerged from the spontaneous chiral symmetry breaking
(S$\chi$SB) -- are generated via the chiral condensate in the chiral limit and
beyond. Results for the valence parton distribution functions for the PS meson
at the factorization scale $Q = 2$ GeV are in excellent agreement with
experimental data and the gluon distribution for the pion fitted well with the
lattice QCD and Jefferson Lab Angular Momentum (JAM) QCD global fit analysis.
| [
{
"created": "Fri, 3 Mar 2023 00:53:07 GMT",
"version": "v1"
}
] | 2023-03-06 | [
[
"Hutauruk",
"Parada T. P.",
""
],
[
"Nam",
"Seung-il",
""
]
] | This review paper presents the gluon, sea, and valence quark distributions of the pseudoscalar (PS) mesons. The calculations of the parton structure of PS mesons are performed using the Bethe-Salpeter equation-Nambu--Jona-Lasinio (BSE-NJL) model, which offers a clear description of the dynamical chiral symmetry breaking (D$\chi$SB) of the low-energy nonperturbative quantum chromodynamics (QCD), with the help of the Schwinger proper-time regularization scheme that simulates the color QCD confinement. Our results for the dynamical quark mass -- which emerged from the spontaneous chiral symmetry breaking (S$\chi$SB) -- are generated via the chiral condensate in the chiral limit and beyond. Results for the valence parton distribution functions for the PS meson at the factorization scale $Q = 2$ GeV are in excellent agreement with experimental data and the gluon distribution for the pion fitted well with the lattice QCD and Jefferson Lab Angular Momentum (JAM) QCD global fit analysis. |
hep-ph/9210221 | Lawrence Krauss | Lawrence M. Krauss, Evalyn Gates, and Martin White | Solar Neutrino Data, Solar Model Uncertainties and Neutrino Oscillations | 10 pages, latex, 3 figures (not included) | Phys.Lett.B299:94-98,1993 | 10.1016/0370-2693(93)90888-O | YCTP-P38-92 | hep-ph astro-ph | null | We incorporate all existing solar neutrino flux measurements and take solar
model flux uncertainties into account in deriving global fits to parameter
space for the MSW and vacuum solutions of the solar neutrino problem.
| [
{
"created": "Thu, 8 Oct 1992 18:26:05 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Krauss",
"Lawrence M.",
""
],
[
"Gates",
"Evalyn",
""
],
[
"White",
"Martin",
""
]
] | We incorporate all existing solar neutrino flux measurements and take solar model flux uncertainties into account in deriving global fits to parameter space for the MSW and vacuum solutions of the solar neutrino problem. |
hep-ph/0701018 | Yoshio Koide | Yoshio Koide | A_4 Symmetry and Lepton Masses and Mixing | 13 pages including 1 table, errors in Sec.7 corrected | Eur.Phys.J.C52:617-623,2007 | 10.1140/epjc/s10052-007-0433-1 | US-07-01R | hep-ph | null | Stimulated by Ma's idea which explains the tribimaximal neutrino mixing by
assuming an A_4 flavor symmetry, a lepton mass matrix model is investigated. A
Frogatt-Nielsen type model is assumed, and the flavor structures of the masses
and mixing are caused by the VEVs of SU(2)_L-singlet scalars \phi_i^u and
\phi_i^d (i=1,2,3), which are assigned to {\bf 3} and ({\bf 1}, {\bf 1}',{\bf
1}'') of A_4, respectively.
| [
{
"created": "Wed, 3 Jan 2007 06:10:35 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Mar 2007 10:59:52 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Koide",
"Yoshio",
""
]
] | Stimulated by Ma's idea which explains the tribimaximal neutrino mixing by assuming an A_4 flavor symmetry, a lepton mass matrix model is investigated. A Frogatt-Nielsen type model is assumed, and the flavor structures of the masses and mixing are caused by the VEVs of SU(2)_L-singlet scalars \phi_i^u and \phi_i^d (i=1,2,3), which are assigned to {\bf 3} and ({\bf 1}, {\bf 1}',{\bf 1}'') of A_4, respectively. |
2109.05041 | Marco Frasca | Marco Frasca, Anish Ghoshal and Stefan Groote | On a novel evalutation of the hadronic contribution to the muon's $g-2$
from QCD | 15 pages, no figure. Aligned with the published version | Phys. Rev. D 104, 114036 (2021) | 10.1103/PhysRevD.104.114036 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We evaluate the hadronic contribution to the $g-2$ of the muon by deriving
the low-energy limit of quantum chromodynamics (QCD) and computing in this way
the hadronic vacuum polarization. The low-energy limit is a non-local
Nambu--Jona-Lasinio (NJL) model that has all the parameters fixed from QCD, and
the only experimental input used is the confinement scale that is known from
measurements of hadronic physics. Our estimations provide a novel analytical
alternative to the current lattice computations and we find that our result is
close to the similar computation performed from experimental data. We also
comment on how this analytical approach technique, in general, may provide
prospective estimates for hadronic computations from dark sectors and its
implication in BSM model-building in future.
| [
{
"created": "Fri, 10 Sep 2021 18:03:14 GMT",
"version": "v1"
},
{
"created": "Fri, 3 Dec 2021 15:11:25 GMT",
"version": "v2"
},
{
"created": "Thu, 30 Dec 2021 15:05:20 GMT",
"version": "v3"
}
] | 2022-01-03 | [
[
"Frasca",
"Marco",
""
],
[
"Ghoshal",
"Anish",
""
],
[
"Groote",
"Stefan",
""
]
] | We evaluate the hadronic contribution to the $g-2$ of the muon by deriving the low-energy limit of quantum chromodynamics (QCD) and computing in this way the hadronic vacuum polarization. The low-energy limit is a non-local Nambu--Jona-Lasinio (NJL) model that has all the parameters fixed from QCD, and the only experimental input used is the confinement scale that is known from measurements of hadronic physics. Our estimations provide a novel analytical alternative to the current lattice computations and we find that our result is close to the similar computation performed from experimental data. We also comment on how this analytical approach technique, in general, may provide prospective estimates for hadronic computations from dark sectors and its implication in BSM model-building in future. |
1108.4768 | J.D. Vergados | J. D. Vergados (CERN, Theory Division, Geneva, Switzerland and
Theoretical Physics Division, University of Ioannina, Ioannina, Greece) | Predicted modulated differential rates for direct WIMP searches at low
energy transfers | 16 pages, 22 figures; references added | null | 10.1088/0253-6102/57/3/28 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The differential event rate for direct detection of dark matter, both the
time averaged and the modulated one due to the motion of the Earth, are
discussed. The calculations focus on relatively light cold dark matter
candidates (WIMP) and low energy transfers. It is shown that for sufficiently
light WIMPs the extraction of relatively large nucleon cross sections is
possible. Furthermore for some WIMP masses the modulation amplitude may change
sign, meaning that, in such a case, the maximum rate may occur six months later
than naively expected. This effect can be exploited to yield information about
the mass of the dark matter candidate, if and when the observation of the
modulation of the event rate is established.
| [
{
"created": "Wed, 24 Aug 2011 07:30:49 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Sep 2011 11:46:03 GMT",
"version": "v2"
}
] | 2015-05-30 | [
[
"Vergados",
"J. D.",
"",
"CERN, Theory Division, Geneva, Switzerland and\n Theoretical Physics Division, University of Ioannina, Ioannina, Greece"
]
] | The differential event rate for direct detection of dark matter, both the time averaged and the modulated one due to the motion of the Earth, are discussed. The calculations focus on relatively light cold dark matter candidates (WIMP) and low energy transfers. It is shown that for sufficiently light WIMPs the extraction of relatively large nucleon cross sections is possible. Furthermore for some WIMP masses the modulation amplitude may change sign, meaning that, in such a case, the maximum rate may occur six months later than naively expected. This effect can be exploited to yield information about the mass of the dark matter candidate, if and when the observation of the modulation of the event rate is established. |
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