id large_stringlengths 9 16 | title large_stringlengths 1 382 | abstract large_stringlengths 3 6.09k | publish_date date32 | update_date date32 | categories large listlengths 1 13 | authors large_stringlengths 3 62.8k |
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hep-ph/9312232 | Natural Conservation of R Parity in Supersymmetry | Since baryon number B and lepton number L are no longer automatically
conserved once the standard model is extended to include supersymmetry, the
usually assumed conservation of R parity is an imposed condition. For a more
satisfactory realization of supersymmetry, we propose here a new model which
conserves R automati... | 1993-12-06 | 2009-09-15 | [
"hep-ph"
] | V. Barger and Ernest Ma |
hep-ph/9312225 | Heavy meson effective thoery with 1/M_Q correction | We construct an effective Lagrangian of heavy and light mesons with $1/M_Q$
correction. The Lagrangian is constructed model independent way by using only
the information of the symmetry of QCD. Reparameterisation invariance at the
meson level is taken into account for the consistency of the theory. The
partial decay wi... | 1993-12-06 | 2009-10-22 | [
"hep-ph"
] | N.Kitazawa and T.Kurimoto |
hep-ph/9312227 | Heavy Quark S- to P-Wave Transitions in a Consistent Quark Model | In Heavy Quark Effective Theory the calculation of form-factors of higher
excited states in a non-relativistic framework suffers severe inconsistencies
due to frame dependencies. We show how careful inclusion of the Wigner-rotation
of the spin of the light quark and a covariant description of the meson
wave-function re... | 1993-12-06 | 2016-09-01 | [
"hep-ph"
] | A. Wambach |
hep-ph/9312229 | The Semileptonic Decay Fraction of B Mesons in the Light of Interfering
Amplitudes | Consequences of the interference between spectator amplitudes for the
lifetimes and semileptonic decay fractions of B^0 and B^+ mesons are discussed.
Assuming duality and constructive interference between spectator amplitudes we
are able to explain the low experimental value for the semileptonic decay
fraction of $B$ m... | 1993-12-06 | 2016-09-01 | [
"hep-ph"
] | K. Honscheid, R. Waldi, K. Schubert |
hep-ph/9312234 | Cancellation of power enhancements in non-spectator decays | Exclusive non-spectator decay rates of beauty hadrons contain power
enhancements of the form (m_b/m)^2 and m_b/m, where m_b is the b-quark mass and
m is a light quark mass. An implicit argument has been recently given according
to which these singularities cancel in the totally inclusive decay width. We
present in this... | 1993-12-06 | 2009-10-22 | [
"hep-ph"
] | U. Aglietti |
hep-ph/9312226 | Real-Time Thermal Propagators and the QED Effective Action for an
External Magnetic Field | The thermal averaged real-time propagator of a Dirac fermion in a static
uniform magnetic field $B$ is derived. At non-zero chemical potential and
temperature we find explicitly the effective action for the magnetic field,
which is shown to be closely related to the Helmholz free energy of a
relativistic fermion gas, a... | 1993-12-06 | 2011-05-23 | [
"hep-ph"
] | P. Elmfors, D. Persson and B.-S. Skagerstam |
hep-ph/9312222 | Grand Unification of Fermion Masses | After a brief review of the flavour problem we present a new predictive
framework based on SUSY $SO(10)$ theory, where the first family plays a role of
the mass unification point. The inter-family hierarchy is first generated in a
sector of superheavy fermions and then transfered in an inverse way to ordinary
quarks an... | 1993-12-06 | 2009-09-25 | [
"hep-ph"
] | Zurab G. Berezhiani |
hep-ph/9312230 | Partial Derivation of Transformation Properties of Quarks and Leptons | Under the assumptions that $SU(3)_c\times U(1)_Y \times G^{\prime}$ with
$G^{\prime}$ simple is a local symmetry group at high energies, that color is
parity-conserving, and the Y-charges are irreducible, we show that anomaly
constraints imply the minimal set of fermions is fifteen in number. Given this
minimal set, we... | 1993-12-06 | 2009-10-22 | [
"hep-ph"
] | Paul H. Frampton and Rabindra N. Mohapatra |
hep-ph/9312228 | Photon-Photon Scattering at the Photon Linear Collider | Photon-photon scattering at the Photon Linear Collider is considered.
Explicit formulas for helicity amplitudes due to $W$ boson loops are presented.
It is shown that photon-photon scattering should be easily observable at PLC
and separation of the $W$ loop contribution (which dominates at high energies)
will be possib... | 1993-12-06 | 2009-10-22 | [
"hep-ph"
] | G. Jikia and A. Tkabladze |
hep-ph/9312233 | Direct CP violation in b -> d J/\psi decays | We investigate the possibility of observing direct CP violation in
self-tagging B-meson decays of the type b -> d J/\psi. The CP asymmetry can be
generated due to strong or electromagnetic scattering in the final state, or
due to long distance effects. The first two contributions give asymmetries of a
few 10^(-3), in t... | 1993-12-06 | 2010-11-01 | [
"hep-ph"
] | Isard Dunietz and Joao M. Soares |
hep-ph/9312224 | $1/m_b$ Corrections in the ACCMM Model for Inclusive Semileptonic B
Decay | We re-examine the model of Altarelli, Cabibbo, Corb\`{o}, Maiani and
Martinelli for inclusive semileptonic B decay, in the light of recent
calculations in heavy quark effective theory. The model can be shown to have
no~$1/m_b$ corrections, with a suitable definition of the b quark mass~$m_b$.
However, we find that the ... | 1993-12-06 | 2011-01-27 | [
"hep-ph"
] | Grant Baillie |
hep-ph/9312221 | The $\epsilon$-expansion and the electroweak phase transition | Standard perturbative (or mean field theory) techniques are not adequate for
studying the finite-temperature electroweak phase transition in some cases of
interest to scenarios for electroweak baryogenesis. We instead study the
properties of this transition using the renormalization group and the
$\epsilon$-expansion. ... | 1993-12-05 | 2014-11-17 | [
"hep-ph"
] | Peter Arnold and Laurence G. Yaffe |
hep-ph/9312220 | Inclusive Semileptonic Decays in QCD Including Lepton Mass Effects | Starting from an Operator Product Expansion in the Heavy Quark Effective
Theory up to order 1/m_b^2 we calculate the inclusive semileptonic decays of
unpolarized bottom hadrons including lepton mass effects. We calculate the
differential decay spectra d\Gamma/(dE_\tau ), and the total decay rate for B
meson decays to f... | 1993-12-05 | 2011-01-27 | [
"hep-ph"
] | S.Balk, J.G.Korner, D.Pirjol and K.Schilcher |
hep-ph/9312219 | Electric Polarizability of the Nucleon in the Nambu--Jona-Lasinio Model | The electric polarizability of the nucleon is calculated in the soliton
approach to the Nambu--Jona-Lasinio model. We analyze the leading-$N_c$
contributions, as well as the effects of rotational $1/N_c$ corrections and
$\Delta$-$N$ mass splitting. Our model prediction is substantially reduced
compared to other soliton... | 1993-12-04 | 2009-10-22 | [
"hep-ph"
] | E. Nikolov, W. Broniowski and K. Goeke |
hep-ph/9312217 | Lepton Flavor Non-Conservation | In the present work we review the most prominent lepton flavor violating
processes ($\mu \ra e\gamma$, $\mu \ra 3e$, $(\mu , e)$ conversion, $M-\bar M$
oscillations etc), in the context of unified gauge theories. Many currently
fashionable extensions of the standard model are considered, such as: {\it i)}
extensions of... | 1993-12-03 | 2011-07-19 | [
"hep-ph"
] | T. S. Kosmas, G. K. Leontaris and J. D. Vergados |
hep-ph/9312218 | Supersymmetry Relations Between Contributions To One-Loop Gauge Boson
Amplitudes | We apply ideas motivated by string theory to improve the calculational
efficiency of one-loop weak interaction processes with massive external gauge
bosons. In certain cases ``supersymmetry'' relations between diagrams with a
fermion loop and with a gauge boson loop hold. This is explicitly illustrated
for a particular... | 1993-12-03 | 2009-10-22 | [
"hep-ph"
] | Z. Bern and A. G. Morgan |
hep-ph/9312216 | Weak $\Lam N\to NN$ Transition in the Direct Quark Mechanism | The weak $\Lam N\to NN$ transition is studied in the valence quark model
approach. The momentum transfer for this transition is so large that the
short-distance two baryon dynamics must be taken into account. The two baryon
system is described in the quark cluster model and the weak transition
amplitude is calculated b... | 1993-12-03 | 2007-05-23 | [
"hep-ph",
"nucl-th"
] | Takashi Inoue, Sachiko Takeuchi, and Makoto Oka |
hep-ph/9312212 | Unstable particles in One Loop Calculations | We present a gauge invariant way to compute one loop corrections to processes
involving the production and decay of unstable particles. | 1993-12-02 | 2009-10-22 | [
"hep-ph"
] | Andre Aeppli, Geert Jan van Oldenborgh and Daniel Wyler |
hep-ph/9312214 | Light Fermion Masses in Superstring Derived Standard--like Models | I discuss the suppression of the lightest generation fermion mass terms in
realistic superstring standard--like models in the free fermionic formulation.
The suppression of the mass terms is a consequence of horizontal symmetries
that arise due to the $Z_2\times Z_2$ orbifold compactification. In a specific
model I inv... | 1993-12-02 | 2009-10-22 | [
"hep-ph",
"hep-th"
] | Alon E. Faraggi |
hep-ph/9312210 | Tracing CP violation in the production of top quark pairs by multiple
TeV proton-proton collisions | We investigate the possibilities of searching for non-standard CP violation
in $pp\to t\bar{t}X$ at multiple TeV collision energies. A general kinematic
analysis of the underlying partonic production processes $gg\to t\bar{t}$ and
$q\bar{q}\to t\bar{t}$ in terms of their density matrices is given. We evaluate
the CP-vi... | 1993-12-02 | 2014-11-17 | [
"hep-ph"
] | W. Bernreuther and A. Brandenburg |
hep-ph/9312209 | General relations of heavy quark-antiquark potentials induced by
reparameterization invariance | A set of general relations between the spin-independent and spin-dependent
potentials of heavy quark and anti-quark interactions are derived from
reparameterization invariance in the Heavy Quark Effective Theory. It covers
the Gromes relation and includes some new interesting relations which are
useful in understanding... | 1993-12-02 | 2009-10-22 | [
"hep-ph"
] | Yu-Qi Chen and Yu-Ping Kuang |
hep-ph/9312213 | Production and Decay of Scalar Stoponium Bound States | In this paper we discuss possible signatures for the production of scalar
\stst\ (stoponium) bound states \sigst\ at hadron colliders, where \st\ is the
lighter scalar top eigenstate. We first study the decay of \sigst; explicit
expressions are given for all potentially important decay modes. If \st\ has
unsuppressed t... | 1993-12-02 | 2009-10-22 | [
"hep-ph"
] | M. Drees (Madison) and M.M. Nojiri (KEK) |
hep-ph/9312211 | Future Solar Neutrino Experiments and Neutrino Spin-Flavour Precession | The main features of the observables in the SNO and Super-Kamiokande solar
neutrino experiments in the case of neutrino spin and/or spin-flavour
precession in the magnetic field of the sun are discussed. It is shown without
any model dependent assumption that in the case of Majorana transition magnetic
moments the NC e... | 1993-12-02 | 2007-05-23 | [
"hep-ph",
"astro-ph"
] | S.M. Bilenky and C. Giunti |
hep-ph/9312215 | Standard Model CP-violation and Baryon asymmetry | Simply based on CP arguments, we argue against a Standard Model explanation
of the baryon asymmetry of the universe in the presence of a first order phase
transition. A CP-asymmetry is found in the reflection coefficients of quarks
hitting the phase boundary created during the electroweak transition. The
problem is ana... | 1993-12-02 | 2008-11-26 | [
"hep-ph"
] | M.B. Gavela, P.Hern\'andez, J. Orloff, O.P\`ene |
hep-ph/9312205 | Heavy Quarkonium Potential Model and the ${}^1P_1$ State of Charmonium | A theoretical explanation of the observed splittings among the P~states of
charmonium is given with the use of a nonsingular potential model for heavy
quarkonia. We also show that the recently observed mass difference between the
center of gravity of the ${}^3P_J$ states and the ${}^1P_1$ state of $c\bar{c}$
does not p... | 1993-12-01 | 2009-10-22 | [
"hep-ph"
] | Suraj N. Gupta, James M. Johnson, Wayne W. Repko and Casimir J.
Suchyta III |
hep-ph/9312207 | Equivalence Theorem and Dynamical Symmetry Breaking: | The equivalence theorem, between the longitudinal gauge bosons and the states
eaten up by them in the process of symmetry breaking, is shown to be valid in a
class of models where the details of dynamical symmetry breaking makes it
obscure. | 1993-12-01 | 2009-10-22 | [
"hep-ph",
"hep-th"
] | Palash B. Pal (Center for Particle Physics, University of Texas,
Austin, TX, USA) |
hep-ph/9312202 | The Potential of a New Linear Collider for the Measurement of the
Trilinear Couplings among the Electroweak Vector Bosons | We study the accuracy to be obtained in measuring trilinear $Z^0W^+W^-$ and
$\gamma W^+W^-$ couplings in the reaction $e^+e^- \to W^+W^-$ at "New Linear
Collider" energies of $500GeV$ to $1000GeV$. We derive simple scaling laws for
the sensitivity in the measurement of these couplings. For most couplings the
sensitivit... | 1993-12-01 | 2011-07-19 | [
"hep-ph"
] | M. Bilenky, J.-L. Kneur, F.M. Renard and D. Schildknecht |
hep-ph/9312201 | Detecting the $tb$ Decays of a Charged Higgs Boson at a Hadron
Supercollider | We demonstrate that detection of a charged Higgs boson decaying via $\hpm\rta
t b$ will be possible at the LHC in $gg\rta \hm t \anti b+\hp b\anti t$ events,
provided the $\hp\rta t\anti b$ coupling is substantial, $\mt\gsim 110\gev$,
and reasonably efficient and pure $b$-tagging can be performed. | 1993-12-01 | 2011-08-11 | [
"hep-ph"
] | J.F. Gunion |
hep-ph/9312203 | The Momentum--Space Bosonization of the Nambu--Jona-Lasinio Model with
Vector and Axial-Vector Mesons | The momentum-space bosonization method is extended to the case of a
Nambu--Jona-Lasinio type model with vector and axial-vector mesons. The method
presented gives the possibility of deriving any meson vertex function to all
orders in momenta and to the leading order in $1/N_c$. Two-point functions,
which describe one-p... | 1993-12-01 | 2016-08-16 | [
"hep-ph",
"nucl-th"
] | V\'eronique Bernard, Ulf-G. Mei{\ss}ner and A.A. Osipov |
hep-ph/9312208 | BARYOGENESIS. byvited talk at TAUP 93, LNGS, Italy, September 1993 | A review of the present state of the baryogenesis is given with an emphasis
on electroweak baryogenesis. Technical details of the numerous models cosidered
in the literature are not elaborated but unresolved problems of the issue are
considered. Different logically possible alternatives of the electroweak
scenarios are... | 1993-12-01 | 2010-11-01 | [
"hep-ph"
] | A. D. Dolgov |
hep-ph/9312206 | First Constraints on SU(5)xU(1) Supergravity from Trilepton Searches at
the Tevatron | We present the first constraints on the parameter space of $SU(5)\times U(1)$
supergravity (in both no-scale and dilaton scenarios) which arise from the
recently announced limits on trilepton searches at the Tevatron. The trilepton
rate has been calculated for those points in parameter space which satisfy not
only the ... | 1993-12-01 | 2007-05-23 | [
"hep-ph"
] | J. Lopez, D. Nanopoulos, G. Park, X. Wang, and A. Zichichi |
hep-ph/9312204 | The Electric Charge of Neutrinos and Plasmon Decay | By using both thermal field theory and a somewhat more intuitive method, we
define the electric charge as well as the charge radius of neutrinos
propagating inside a plasma. We show that electron neutrinos acquire a charge
radius of order $\sim 6.5 \times 10^{-16}$ cm, regardless of the properties of
the medium. Then, ... | 1993-12-01 | 2009-10-22 | [
"hep-ph",
"astro-ph"
] | T. Altherr and P. Salati |
hep-ph/9311375 | V,W and X in Technicolour Models | Light techni-fermions and pseudo Goldstone bosons that contribute to the
electroweak radiative correction parameters V,W and X may relax the constraints
on technicolour models from the experimental values of the parameters S and T.
Order of magnitude estimates of the contributions to V,W and X from light
techni-leptons... | 1993-11-30 | 2009-10-22 | [
"hep-ph"
] | Nick Evans |
hep-ph/9311376 | Implications of Scaling Violations of F2 at HERA for Perturbative QCD | We critically examine the QCD predictions for the $Q^2$ dependence of the
electron-proton deep-inelastic structure function $F_2(x,Q^2)$ in the small $x$
region, which is being probed at HERA. The standard results based on
next-to-leading order Altarelli-Parisi evolution are compared with those that
follow from the BFK... | 1993-11-30 | 2010-03-25 | [
"hep-ph"
] | A.J. Askew, K. Golec, J. Kwiecinski, A.D. Martin and P.J. Sutton |
hep-ph/9311379 | Anomalous Condensates and the Equivalence Theorem | A recently published report has called into question the validity of the
equivalence theorem in dynamically broken gauge theories in which the fermions
making up the symmetry breaking condensate lie in an anomalous representation
of the broken gauge group. Such a situation can occur if the gauge anomaly is
cancelled by... | 1993-11-30 | 2009-10-22 | [
"hep-ph"
] | William B. Kilgore |
hep-ph/9311377 | Singular defects with fractional topological charge\\ in $\sigma$ models
and gauge theories | A novel class of self-dual solutions in $\sigma$ models and gauge theories is
considered. The contribution of the corresponding fluctuations to the chiral
condensate is calculated. We discuss the few tightly connected problems, such
as the $U(1)$ problem, the $\theta$ dependence and the chiral symmetry breaking
within ... | 1993-11-30 | 2009-10-22 | [
"hep-ph",
"hep-lat"
] | A.R.Zhitnitsky |
hep-ph/9311378 | Recent Progress in the Theory of Heavy Flavor Production | We review some recent results on heavy quark production in high energy
hadronic collisions. We will discuss in particular the status of production
cross sections for bottom quarks and charmonium states and will present some
studies on the production of bottom and charm jets, at the inclusive level and
in association wi... | 1993-11-30 | 2009-09-25 | [
"hep-ph"
] | Michelangelo MANGANO |
hep-ph/9311374 | Fermion sea along the sphaleron barrier | In this revised version we have improved the treatment of the top and bottom
quark mass. This leads to slight changes of the numerical results, especially
of those presented in Fig.4. The discussion of the numerical procedure and
accuracy has been extended. | 1993-11-30 | 2009-10-22 | [
"hep-ph"
] | Dmitri Diakonov, Maxim Polyakov, Peter Sieber, Joerg Schaldach and
Klaus Goeke |
hep-ph/9311371 | Discrete Symmetries, Strong CP Problem and Gravity | Spontaneous breaking of parity or time reversal invariance offers a solution
to the strong CP problem, the stability of which under quantum gravitational
effects provides an upper limit on the scale of symmetry breaking. Even more
important, these Planck scale effects may provide a simple and natural way out
of the res... | 1993-11-29 | 2007-05-23 | [
"hep-ph"
] | G.Senjanovic |
hep-ph/9311373 | Parameterisation (and Gauge) Invariance of the Transition Temperature | The so-called Unitary Gauge Puzzle is re-examined in the light of a set of
gauge dependence identities discovered by Kobes, Kunstatter and Rebhan. The
``puzzle'' is discovered to arise as an artifact of the gauge-variant and
off-shell nature of the Effective Potential. An explicit analysis of the scalar
sector of the A... | 1993-11-29 | 2007-05-23 | [
"hep-ph"
] | P.F. Kelly |
hep-ph/9311370 | Unitarity Constraints for Transverse Gauge Bosons at LEP and
Supercolliders | Using asymptotic helicity amplitudes for Vector-Vector, Vector-Higgs and
Higgs-Higgs scattering, we establish the unitarity constraints on the $SU(2)_c$
conserving and $W_\mu$ depending interactions, which at sufficiently high
energies may create strong forces among the transverse vector boson and Higgs
states. We then... | 1993-11-29 | 2019-08-17 | [
"hep-ph"
] | J. Layssac, F.M. Renard, G. Gounaris |
hep-ph/9311369 | Evaluation of the One-loop Effective Action at Zero and Finite
Temperature | A method for determining the leading quantum contributions to the effective
action for both zero and finite temperatures is presented. While it is
described in the context of a scalar field theory, it can be straight-forwardly
extended to include fermions. An extrapolation procedure which can
significantly enhance the ... | 1993-11-29 | 2010-11-01 | [
"hep-ph"
] | Clarence L. Lee |
hep-ph/9311372 | Heavy Charged Higgs Signals at the LHC | We discuss the viability of $gb \to tH \to ttb$ charged-Higgs signals at the
proposed LHC $pp$ supercollider, in the decay channel $tt \to (bq \bar q')(b
\ell \nu)$. Here one top quark decays hadronically and one semileptonically,
with all three $b$-quarks giving flavor-tagged jets. The principal backgrounds
come from ... | 1993-11-29 | 2009-09-25 | [
"hep-ph"
] | V. Barger, R.J.N. Phillip and D.P. Roy |
hep-ph/9311368 | Monte Carlo Approach to Radiative Corrections in Bhabha Scattering | A new Monte Carlo model is proposed for radiative corrections to Bhabha
scattering by extending QEDPS developed for multi-photon emission in muon pair
production in $e^+e^-$ annihilation. This is the QED version of the model known
as parton shower in QCD. The main difference between muon pair production and
Bhabha scat... | 1993-11-29 | 2017-02-01 | [
"hep-ph"
] | J.Fujimoto, Y.Shimizu and T.Munehisa |
hep-ph/9311367 | Strong Sphalerons and Electroweak Baryogenesis | We analyze the spontaneous baryogenesis and charge transport mechanisms
suggested by Cohen, Kaplan and Nelson for baryon asymmetry generation in
extended versions of electroweak theory. We find that accounting for
non-perturbative chirality-breaking transitions due to strong sphalerons
reduces the baryonic asymmetry by... | 1993-11-26 | 2009-10-22 | [
"hep-ph"
] | G. Giudice and M. Shaposhnikov |
hep-ph/9311366 | The Mass of the Lightest Supersymmetric Higgs Boson beyond the Leading
Logarithm Approximation | We examine the radiative corrections to the mass of the lightest Higgs boson
in the minimal supersymmetric extension of the standard model. We use the
renormalization-group improved effective potential which includes the
next-to-leading-order contributions. We find that, contrary to the result of
Espinosa and Quir\'os,... | 1993-11-26 | 2009-10-22 | [
"hep-ph"
] | Jiro Kodaira, Yoshiaki Yasui and Ken Sasaki |
hep-ph/9311363 | Full O(alpha) Radiative Corrections to High-Energy Compton Scattering | Using computer-algebraic methods we derive compact analytical expressions for
the virtual electroweak radiative corrections to polarized Compton scattering.
Moreover the helicity amplitudes for double Compton scattering, which prove to
be extremely simple in terms of Weyl-van der Waerden spinor products, are
presented ... | 1993-11-25 | 2009-10-22 | [
"hep-ph"
] | S.Dittmaier |
hep-ph/9311364 | The Retarded-Advanced basis in the Real Time formalism | A review of the properties of this alternate basis is presented. To appear in
the proceedings of the 3rd Workshop on Thermal Field Theory, Banff, August
1993. | 1993-11-25 | 2007-05-23 | [
"hep-ph"
] | F.Guerin |
hep-ph/9311365 | An Instanton-Induced Contribution to the Decay of the Eta_c into P-Pbar | We compute the decay rate for the process $\eta_c\to p\bar p$ using an
effective helicity-flipping proton-antiproton-gluon vertex which incorporates
nonperturbative chiral symmetry breaking effects induced by instantons. We fix
the strength of the vertex by requiring it to account for the screening of the
proton's axia... | 1993-11-25 | 2009-10-22 | [
"hep-ph"
] | Mauro Anselmino and Stefano Forte |
hep-ph/9311361 | Anomalies without Massless Particles | Baryon and lepton number in the standard model are violated by anomalies,
even though the fermions are massive. This problem is studied in the context of
a two dimensional model. In a uniform background field, fermion production
arise from non-adiabatic behavior that compensates for the absence of massless
modes. On th... | 1993-11-24 | 2009-10-22 | [
"hep-ph"
] | Zachary Gurlanik |
hep-ph/9311357 | Leading Order QCD Corrections to $b\rightarrow s \, \gamma$ and $b
\rightarrow s \, g$ Decays in Three Regularization Schemes | We discuss in detail the calculation of the leading order QCD corrections to
the Effective Hamiltonian which governs $b \rightarrow s\, \gamma$ and $b
\rightarrow s \, g$ transitions in three different regularization schemes (HV,
NDR and DRED). We show that intermediate stages of the calculation do depend on
the regula... | 1993-11-24 | 2009-10-22 | [
"hep-ph"
] | M. Ciuchini, E. Franco, L. Reina and L. Silvestrini |
hep-ph/9311359 | Results from Neutrino Experiments | Recent (first or/and the best) results from the neutrino experiments are
reviewed and their implications for the theory are discussed. The sense of the
experiments is the searching for neutrino masses, mixing and interactions
beyond the standard model. Present laboratory experiments give upper bounds on
the masses and ... | 1993-11-24 | 2009-09-25 | [
"hep-ph"
] | Alexei Yu. Smirnov |
hep-ph/9311362 | Supergravity Models | Theoretical and experimental motivations behind supergravity grand unified
models are described. The basic ideas of supergravity, and the origin of the
soft breaking terms are reviewed. Effects of GUT thresholds and predictions
arising from models possessing proton decay are discussed. Speculations as to
which aspects ... | 1993-11-24 | 2009-09-25 | [
"hep-ph"
] | R. Arnowitt and Pran Nath |
hep-ph/9311355 | New classes of summable Skyrmions | We introduce two new classes of summable Skyrmions. The Lagrangians they
originate from are explicitely constructed. We also analyse how some models
could be solve. Exact solutions are found for Skyrme-like toy models. | 1993-11-24 | 2015-06-25 | [
"hep-ph"
] | L. Marleau |
hep-ph/9311354 | Aspects of Nucleon Compton Scattering | We consider the spin-averaged nucleon forward Compton scattering amplitude in
heavy baryon chiral perturbation theory including all terms to order ${\cal O}
(q^4)$. The chiral prediction for the spin-averaged forward Compton scattering
amplitude is in good agreement with the data for photon energies $\omega \le
110$ Me... | 1993-11-24 | 2015-06-25 | [
"hep-ph",
"nucl-th"
] | V. Bernard, N. Kaiser, Ulf-G. Mei{\ss}ner and A. Schmidt |
hep-ph/9311350 | QCD and the Chiral Critical Point | As an extension of $QCD$, consider a theory with ``$2+1$'' flavors, where the
current quark masses are held in a fixed ratio as the overall scale of the
quark masses is varied. At nonzero temperature and baryon density it is
expected that in the chiral limit the chiral phase transition is of first
order. Increasing the... | 1993-11-24 | 2009-12-30 | [
"hep-ph",
"hep-lat",
"nucl-th"
] | S. Gavin, A. Gocksch, & R. D. Pisarski |
hep-ph/9311353 | The Exact Critical Bubble Free Energy and the Effectiveness of Effective
Potential Approximations | To calculate the temperature at which a first-order cosmological phase
transition occurs, one must calculate $F_c(T)$, the free energy of a critical
bubble configuration. $F_c(T)$ is often approximated by the classical energy
plus an integral over the bubble of the effective potential; one must choose a
method for calc... | 1993-11-24 | 2009-10-22 | [
"hep-ph"
] | David Brahm and Clarence L.Y. Lee |
hep-ph/9311360 | Neutrino properties from maximally-predictive GUT models and the
structure of the heavy Majorana sector | Starting from a complete set of possible parametrisations of the quark-mass
matrices that have the maximum number of texture zeros at the grand unification
scale, and the Georgi-Jarlskog mass relations, we classify the neutrino spectra
with respect to the unknown structure of the heavy Majorana sector. The results
can ... | 1993-11-24 | 2015-06-25 | [
"hep-ph"
] | E. Papageorgiu |
hep-ph/9311351 | The Phenomenology of a Hidden Symmetry Breaking Sector at
Electron-Positron Colliders | We calculate the production rate of gauge-boson pairs at $e^+e^-$ colliders
in a model with a ``hidden'' electroweak symmetry breaking sector - i.e. one in
which there are a large number of particles in the symmetry breaking sector
other than the $W^{\pm}$ \thinspace and the $Z^0$. In such a model, the elastic
$W^{\pm}... | 1993-11-24 | 2007-05-23 | [
"hep-ph"
] | M. V. Ramana |
hep-ph/9311356 | Model Independent $Z'$ Constraints at Future $e^+e^-$ Colliders} | Model independent constraints on the mass of extra neutral gauge bosons and
their couplings to charged leptons are given for LEP~II and a 500\,GeV $e^+e^-$
collider. Analytical exclusion limits are derived in the Born approximation.
The $Z'$ limits obtained with radiative corrections are always worse than those
calcula... | 1993-11-24 | 2009-10-22 | [
"hep-ph"
] | Arnd Leike |
hep-ph/9311352 | Small SUSY phases in string-inspired supergravity | In supersymmetric models, there are new CP violating phases which, if
unsuppressed, would give a too large neutron electric dipole moment. We examine
the possibility of small SUSY phases in string-inspired supergravity models in
which supersymmetry is broken by the auxiliary components of the dilaton and
moduli superfi... | 1993-11-24 | 2010-11-01 | [
"hep-ph"
] | Kiwoon Choi |
hep-ph/9311358 | Thermal Background Corrections to the Neutrino Electromagnetic Vertex in
Models with Charged Scalar Bosons | We calculate the correction to the neutrino electromagnetic vertex due to
background of electrons in a large class of models, as the supersymmetric model
with explicit breaking of R-parity, where charged scalar bosons couple to
leptons and which are able to provide an astrophysically interesting value for
the neutrino ... | 1993-11-24 | 2011-07-19 | [
"hep-ph"
] | Antonio Riotto |
hep-ph/9311339 | The Baffling Semileptonic Branching Ratio of $B$ Mesons | The apparent gap between the measured and the expected value for the
semileptonic branching ratio of $B$ mesons has become more serious over the
last year. This is due to the improved quality of the data and to the
increasing maturity of the theoretical treatment of non-perturbative
corrections. We discuss various theo... | 1993-11-23 | 2009-10-22 | [
"hep-ph"
] | I.Bigi, B.Blok, M.Shifman, A.Vainshtein |
hep-ph/9311344 | The QCD String with Quarks. I.Spinless Quarks | Starting from the QCD Lagrangian we derive the effective action for massive
quark and antiquark at large distances, corresponding to the minimal area low
of the Wilson loop. The path integral method is used to quantize the system and
the spectrum is obtained with asymptotically linear Regge trajectories. Two
dynamical ... | 1993-11-23 | 2009-07-28 | [
"hep-ph"
] | A.Yu.Dubin, A.B.Kaidalov and Yu.A.Simonov |
hep-ph/9311341 | The Nonperturbative Regime in QCD Resummation for Gauge Boson Production
at Hadron Colliders | We study the nonperturbative functions in the Collins--Soper--Sterman
resummation formalism by examing Drell--Yan data in both fixed target and
collider experiments and then predict the transverse momentum distributions of
the $W^\pm$ and $Z^0$ bosons at the Tevatron. Our results differ from that in
the literature and ... | 1993-11-23 | 2010-01-06 | [
"hep-ph"
] | G.A. Ladinsky and C.--P. Yuan |
hep-ph/9311348 | Two Heavy Quark Effective Theories | We point out that there exist two different formulations of the Heavy Quark
Effective Theory (HQET). One formulation of HQET was mostly developed at
Harvard and involves the use of the equation of motion to eliminate the small
components of the heavy quark field. The second formulation, developed in
Mainz, involves a s... | 1993-11-23 | 2009-09-25 | [
"hep-ph"
] | S.Balk, A.Ilakovac, J.G.Korner and D.Pirjol |
hep-ph/9311346 | Aspects of the Cosmological Electroweak Phase Transition | We study the decay of the metastable symmetric phase in the standard model at
finite temperature. For the SU(2)-Higgs model the two wave function correction
terms $Z_{\vp}(\vp^2,T)$ and $Z_{\chi}(\vp^2,T)$ of Higgs and Goldstone boson
fields are calculated to one-loop order. We find that the derivative expansion
of the... | 1993-11-23 | 2009-10-22 | [
"hep-ph"
] | D. B\"odeker, W. Buchm\"uller, Z. Fodor and T. Helbig |
hep-ph/9311345 | Theoretical Uncertainties and Phenomenological Aspects of $B \rightarrow
X_s \gamma$ Decay | We analyze uncertainties in the theoretical prediction for the inclusive
branching ratio $BR[B \rightarrow X_s \gamma]$. We find that the dominant
uncertainty in the leading order expression comes from its $\mu$-dependence. We
discuss a next-to-leading order calculation of $B \rightarrow X_s \gamma$ in
general terms an... | 1993-11-23 | 2011-07-19 | [
"hep-ph"
] | A. J. Buras, M. Misiak, M. Muenz and S. Pokorski |
hep-ph/9311334 | On the Nature of the Abelian Higgs Model Phase Transition | The nature of the Abelian Higgs Model phase transition is investigated. A
variational approximation is used in the evaluation of the relevant finite
temperature effective potential. Some of the results presented are valid not
only in the Abelian Higgs Model, but also in more complex theories. | 1993-11-23 | 2007-05-23 | [
"hep-ph"
] | G. Amelino-Camelia |
hep-ph/9311342 | On Top Quark Polarization and Proposed Techniques for Measuring $m_t$ at
Hadron Colliders | Measuring the top quark mass in its semileptonic decay mode, $t ->be^+\nu$
($b -> \mu^- + X$), through the mass distribution of the $e^+$--$\mu^-$ pair
has been shown to provide a good measurement of the top quark mass with an
uncertainty of $1.6\%$ for $m_t=150,250\,$GeV at the SSC. Here it is
demonstrated that an unc... | 1993-11-23 | 2007-05-23 | [
"hep-ph"
] | G.A. Ladinsky |
hep-ph/9311343 | Perturbative Hot Gauge Theories - Recent Results | Current results in high temperature gauge theories obtained in the context of
the perturbative method of resumming hard thermal loops are reviewed. Beyond
leading order properties of the gluon excitation, and the recent
(controversial) calculations of the damping rates are discussed. QCD
predictions on plasma signature... | 1993-11-23 | 2007-05-23 | [
"hep-ph"
] | R. Baier |
hep-ph/9311347 | Gluonium as Bound State of Massive Gluons Described by the Joos-Weinberg
Wave Functions | On the basis of the Kadyshevsky equal-time (quasipotential) approach, a set
of partial-wave equations is derived for the wave function of a gluonium, a
bound state of two gluons. The field operators of constituent gluons are
considered as six component quantities according to the Joos-Weinberg
$2(2S+1)$- component appr... | 1993-11-23 | 2010-11-01 | [
"hep-ph"
] | Valeri V. Dvoeglazov and Sergei V. Khudyakov |
hep-ph/9311349 | What do heavy-light ($ Q\bar{q} $) quark systems tell us about QCD
vacuum properties? | Arguments in favor of a large magnitude ( at least two- three times bigger
than its factorized value) of the mixed vacuum condensate $ \la
\bar{q}G_{\mu\nu}^a G_{\mu\nu}^a q \ra$ are given. The analysis is based on the
strict inequalities which follow from the QCD sum rules method and on very
plausible phenomenological... | 1993-11-23 | 2010-11-01 | [
"hep-ph"
] | Ariel R. Zhitnitsky |
hep-ph/9311340 | Two-Loop Renormalization Group Equations for Soft Supersymmetry-Breaking
Couplings | We compute the two-loop renormalization group equations for all soft
supersymmetry-breaking couplings in a general softly broken N=1 supersymmetric
model. We also specialize these results to the Minimal Supersymmetric Standard
Model. | 1993-11-23 | 2014-11-17 | [
"hep-ph"
] | Stephen P. Martin and Michael T. Vaughn |
hep-ph/9311328 | Quark Flavors as Entropy Ordered States of QCD | We discuss a natural notion of entropy in quantum field theory and apply it
to asymptotically free theories in their perturbative regimes. We then
specialize to QCD and find that quark flavor states can be described as
entropy--ordered states of QCD, and that the masses for the $s\bar{s}$--state,
charm, $c\bar{c}$--sta... | 1993-11-22 | 2007-05-23 | [
"hep-ph",
"cond-mat",
"hep-th"
] | J. Perez-Mercader |
hep-ph/9311330 | Flavor symmetry breaking in quark magnetic moments | We discuss the magnetic moments of the baryons allowing for flavor symmetry
breaking in the quark magnetic moments. We show that there is a correlation
between isospin symmetry breaking and data for the nucleon spin structure
obtained from deep inelastic scattering. For small values of the isospin
symmetry breaking, of... | 1993-11-22 | 2011-02-01 | [
"hep-ph"
] | Johan Linde and H{\aa}kan Snellman |
hep-ph/9311329 | Soft Photon Production Rate in Resummed Perturbation Theory of High
Temperature QCD | We calculate the production rate of soft real photons from a hot quark --
gluon plasma using Braaten -- Pisarski's perturbative resummation method. To
leading order in the QCD coupling constant $g$ we find a logarithmically
divergent result for photon energies of order $gT$, where $T$ is the plasma
temperature. This di... | 1993-11-22 | 2009-10-22 | [
"hep-ph"
] | R. Baier, S. Peign\'e and D. Schiff |
hep-ph/9311335 | Non-Leptonic B Decays into K-Resonances | We estimate the non-leptonic B decays $B \rightarrow (\psi ,\psi^\prime ,
\chi_{1c})+K^i$, where $K^i$ are various K-meson resonances. We use the model
of Isgur, Wise, Scora and Grinstein in the context of heavy quark effective
theory, to calculate the hadronic matrix elements. Our estimates show that a
substantial fra... | 1993-11-22 | 2010-11-01 | [
"hep-ph"
] | Mohammad R. Ahmady and Dongsheng Liu |
hep-ph/9311332 | One-Loop QCD Mass Effects in the Production of Polarized Bottom and Top
Quarks | The analytic expressions for the production cross sections of polarized
bottom and top quarks in $e^+e^-$ annihilation are explicitly derived at the
one-loop order of strong interactions. Chirality-violating mass effects will
reduce the longitudinal spin polarization for the light quark pairs by an
amount of $3\%$, whe... | 1993-11-22 | 2015-06-25 | [
"hep-ph"
] | J.G. K"orner, A. Pilaftsis and M.M. Tung |
hep-ph/9311333 | Finite Temperature Effective Potential in the Hartree-Fock Approximation | In order to investigate the nature of the phase transition, we study the
finite temperature effective potential for the $\lambda \Phi^4$ theory in the
Hartree-Fock approximation, which sums up all the daisy and superdaisy
diagrams. | 1993-11-22 | 2007-05-23 | [
"hep-ph"
] | G. Amelino-Camelia and So-Young Pi |
hep-ph/9311336 | Complementarity of Resonant and Nonresonant Strong $WW$ Scattering at
the LHC | We exhibit a complementary relationship between resonant $WZ$ and nonresonant
$W^+W^+$ scattering in a chiral Lagrangian model of the electroweak symmetry
breaking sector with a dominant ``$\rho$'' meson. We use the model to estimate
the minimum luminosity for the LHC to ensure a ``no-lose'' capability to
observe the s... | 1993-11-22 | 2009-10-22 | [
"hep-ph"
] | Michael S. Chanowitz and William Kilgore |
hep-ph/9311338 | Dynamical Generation of Fermion Mass Hierarchy | We describe a simple mechanism to break electroweak symmetry dynamically as
well as to generate a large fermion mass hierarchy. The mechanism is displayed
within the framework of a simple left-right symmetric model.
The model has exact horizontal symmetry which is broken dynamically giving
rise to the mixing angles a... | 1993-11-22 | 2009-09-25 | [
"hep-ph"
] | P. Jain and D. W. McKay |
hep-ph/9311327 | Subleading Corrections to Semileptonic Lambda_c Decays | The semileptonic decay $\Lambda_c \to \Lambda \ell \nu$ is considered in the
framework of heavy quark effective theory beyond the leading order in the
$1/m_c$ expansion. According to our estimate the polarization variable will
receive only very small corrections such that $\alpha_{\Lambda_c} \le -0.95$. | 1993-11-22 | 2009-10-22 | [
"hep-ph"
] | Guey-Lin Lin and Thomas Mannel |
hep-ph/9311337 | Anathematizing the Guralnik and Manohar Inequality for \bar{\Lambda} | There is a recent claim by Guralnik and Manohar \cite{GM} to have established
a rigorous lower bound on $\bar \Lambda$, the asymptotic difference between the
mass of a heavy flavour {\em hadron} and that of the heavy flavour {\em quark}.
We point out the flaw in their reasoning and discuss the underlying physical
probl... | 1993-11-22 | 2010-11-01 | [
"hep-ph"
] | I.I.Bigi, N.G.Uraltsev |
hep-ph/9311331 | Lifetimes of Charmed Hadrons Revisited. Facts and fancy | The problem of the hierarchy of lifetimes of charmed hadrons is reviewed. The
QCD-based theory of preasymptotic effects in inclusive weak decays dating back
to the beginning of the eighties is now entering its mature phase. Combining
recent and old results we argue that the observed hierarchy reflects most
intimate fea... | 1993-11-22 | 2007-05-23 | [
"hep-ph"
] | Boris Blok and Michael Shifman |
hep-ph/9311325 | QCD-Based Interpretation of the Lepton Spectrum in Inclusive $\bar B\to
X_u\,\ell\,\bar\nu$ Decays | We present a QCD-based approach to the endpoint region of the lepton spectrum
in $\bar B\to X_u\,\ell\,\bar\nu$ decays. We introduce a genuinely
nonperturbative form factor, the shape function, which describes the fall-off
of the spectrum close to the endpoint. The moments of this function are related
to forward scatte... | 1993-11-21 | 2010-11-01 | [
"hep-ph"
] | Matthias Neubert |
hep-ph/9311326 | Chaotic Inflation and Baryogenesis in Supergravity | We propose a K\"ahler potential in supergravity which successfully
accommodates chaotic inflation. This model can have a large gravitino mass
without giving a large mass to squarks and sleptons, and thus is free from both
the gravitino problem and entropy crisis. In this model baryogenesis takes
place naturally, identi... | 1993-11-21 | 2009-09-29 | [
"hep-ph"
] | Hitoshi Murayama (LBL), Hiroshi Suzuki (Genova), T. Yanagida (Tohoku),
and Jun'ichi Yokoyama (YITP, Kyoto) |
hep-ph/9311324 | Field Theoretical Background for Thermal Physics | Techniques of zero-temperature field theory that have found application in
the analysis of field theory at finite temperature are revisited. Specifically,
several of the results that are discussed are relevant to the study of
symmetry-changing phase transitions and high temperature QCD, which today are
among the most a... | 1993-11-20 | 2008-02-03 | [
"hep-ph"
] | R. Jackiw and notes by G. Amelino-Camelia |
hep-ph/9311322 | Charmonium Production via Fragmentation | We present the preliminary results of a calculation of the fragmentation
contribution to charmonium production at large transverse momentum in
$p\bar{p}$ colliders. The fragmentation of gluons and charm quarks is the
dominant direct production mechanism for sufficiently large $p_{\perp}$. We
find that for both $J/\psi$... | 1993-11-20 | 2009-09-25 | [
"hep-ph"
] | Michael A. Doncheski, Sean Fleming, and Michelangelo L. Mangano |
hep-ph/9311323 | On the Evaluation of Threshold Effects in Processes Involving Heavy
Quarks | A detailed evaluation is presented of production of heavy fermions
(particularly ttbar quarks) by a vector current, in the region around
threshold. This includes bound states as well as the region above threshold, to
the same degree of accuracy; in both cases radiative and nonperturbative
corrections are included. The ... | 1993-11-20 | 2010-11-01 | [
"hep-ph"
] | F. J. Yndurain |
hep-ph/9311319 | The Cutoff $\lambda \phi^4$ O(N) Model in the Large N Limit | A cutoff version of the $\lambda \phi^4$ O(N) model is considered to leading
order in 1/N with particular attention to the effective potential, which is
surprisingly rich in structure. With suitable restriction on a background
classical field, one finds a phenomenologically viable model with spontaneously
broken symmet... | 1993-11-19 | 2009-10-22 | [
"hep-ph",
"hep-th"
] | Joao P. Nunes and Howard J. Schnitzer |
hep-ph/9311318 | Kaon decay interferometry as meson dynamics probes | We discuss the time dependent interferences between $K_L$ and $K_S$ in the
decays in $3\pi$ and $\pi\pi\gamma$, to be studied at interferometry machines
such as the $\phi$-factory and LEAR. We emphasize the possibilities and the
advantages of using interferences, in comparison with width measurements, to
obtain informa... | 1993-11-19 | 2010-11-01 | [
"hep-ph"
] | G. D'Ambrosio and N. Paver |
hep-ph/9311317 | Maximally-Mixed Three Generations of Neutrinos and the Solar and
Atmospheric Neutrino Problems | Motivated by the indication that both the Solar and the atmospheric neutrino
puzzles may simultaneously be solved by (vacuum as well as matter-induced
resonant) oscillations of two generations of neutrinos with large mixing, we
have analyzed the data on the Solar and atmospheric neutrinos assuming that all
{\it three} ... | 1993-11-19 | 2007-05-23 | [
"hep-ph"
] | C. W. Kim and J. A. Lee |
hep-ph/9311320 | An Extended Technicolor Model | An extended technicolor model is constructed. Quark and lepton masses,
spontaneous CP violation, and precision electroweak measurements are discussed.
Dynamical symmetry breaking is analyzed using the concept of the BIG MAC. | 1993-11-19 | 2010-11-01 | [
"hep-ph"
] | Thomas Appelquist and John Terning |
hep-ph/9311314 | Prediction of beauty particle masses with the heavy quark effective
theory (II) | The effective theory for heavy quarks has additional symmetries with respect
to QCD, which relate charm and beauty hadron masses. Assuming the spectrum of
charmed particles, we predicted in a previous work the masses of some beauty
particles. The predictions of the Lambda_b mass, M(Lambda_b)=5630 MeV, and of
the B_s ma... | 1993-11-19 | 2015-06-25 | [
"hep-ph"
] | Ugo Aglietti |
hep-ph/9311315 | Dimensional Continuation of Gauge-Invariant Quantities in Yang-Mills
Theory | Consideration of some perturbatively calculated gauge-invariant expectation
values of local noncomposite operators in pure Yang-Mills theory indicates that
those expectation values which are not dimension specific, and which are well
defined near $D=4$ dimensions, have some {\it finite} limit as the evaluated
expressio... | 1993-11-19 | 2007-05-23 | [
"hep-ph"
] | Rajesh R. Parwani |
hep-ph/9311316 | Hadronic Contributions to the Muon $g-2$ and Low-Energy QCD | The contributions to the muon anomalous magnetic moment from hadronic vacuum
polarization and from hadronic light-by-light scattering are reexamined within
the frame work of chiral perturbation theory; the $1/N_c$-expansion; and the
extended Nambu Jona-Lasinio model of low-energy QCD. | 1993-11-19 | 2009-10-22 | [
"hep-ph"
] | Eduardo de Rafael |
hep-ph/9311321 | Prediction for Nonabelian Fine Structure Constants from Multicriticality | In developing a model for predicting the nonabelian gauge coupling constants
we argue for the phenomenological validity of a ``principle of multiple point
criticality''. This is supplemented with the assumption of an ``(grand)
anti-unified'' gauge group $SMG^{N_{gen.}}\sim U(1)^{N_{gen.}}\times
SU(2)^{N_{gen.}}\times S... | 1993-11-19 | 2015-06-25 | [
"hep-ph"
] | D.L.Bennett H.B.Nielsen |
hep-ph/9311310 | The Neutrino Mass Spectrum in the Supersymmetric Flipped SU(5)xU(1) GUT
Model | In the context of the supersymmetric flipped $SU(5)\otimes U(1)$ GUT model,
we have studied in detail the neutrino mass spectrum, obtaining an approximate
formula for the corresponding effective three-generation mass matrix. It is
found that at least two neutrinos are expected to have extremely small masses
of no parti... | 1993-11-18 | 2009-10-22 | [
"hep-ph"
] | Stefano Ranfone |
hep-ph/9311307 | General Determination of Phases in Leptonic Mass Matrices | We construct new invariants and give several theorems which determine in
general (i) the number of physically meaningful phases in charged lepton and
neutrino mass matrices and (ii) which elements of these matrices can be
rendered real by rephasings. We illustrate our results with simple models. | 1993-11-18 | 2009-10-22 | [
"hep-ph"
] | A. Kusenko and R. Shrock |
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