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hep-ph/9406276
Non-Debye Screening in Finite Temperature QCD
We study the non-abelian, gauge invariant, screening potential between two charges in a quark-gluon plasma. Using Braaten and Pisarski resummed perturbation theory in temporal axial gauge, we find a repulsive power screened potential which behaves as $\sim 1/r^6$ at large distance. This questions either the physical me...
1994-06-10
2009-10-28
[ "hep-ph" ]
S. Peign\'e and S.M.H. Wong
hep-ph/9406285
Classical Transport Theory and Hard Thermal Loops in the Quark-Gluon Plasma
Classical transport theory for colored particles is investigated and employed to derive the hard thermal loops of QCD. A formal construction of phase-space for color degrees of freedom is presented. The gauge invariance of the non-Abelian Vlasov equations is verified and used as a guiding principle in our approximation...
1994-06-10
2011-07-19
[ "hep-ph", "hep-th", "nucl-th" ]
P.F. Kelly, Q. Liu, C. Lucchesi and C. Manuel
hep-ph/9406277
QCD Transport Theory
Because of the long range of the gauge interactions, the collective behaviour of quarks and gluons plays a decisive role in the transport processes. Collective effects, like Debye screening and Landau damping, remove the unphysical infrared divergences of the transport cross-sections and provide finite relaxation rates...
1994-06-10
2009-10-28
[ "hep-ph" ]
Edmond Iancu
hep-ph/9406275
Effective light front quantization of scalar field theories and two-dimensional electrodynamics
We introduce a new method to include condensates in the light-cone Hamiltonian. By using a Gaussian approximation to the ordinary vacuum in a theory close to the light front, we derive an effective Hamiltonian on the light cone, which has new terms reflecting the nontriviality of the vacuum. We demonstrate our method f...
1994-06-10
2009-10-28
[ "hep-ph" ]
E.V. Prokhvatilov, H.W.L. Naus and H.--J. Pirner
hep-ph/9406282
Time-Like Shock Hadronization of a Supercooled Quark-Gluon Plasma
We study the energy-momentum and baryonic number conservation laws for quark-gluon plasma discontinuity transitions into hadron matter states. We find that the time-like shock hadronization of a supercooled quark-gluon plasma (when the normal vector to the discontinuity hypersurface is time-like) should take place. We ...
1994-06-10
2009-10-28
[ "hep-ph", "nucl-th" ]
M.I. Gorenstein, H.G. Miller, R.M. Quick and R.A. Ritchie
hep-ph/9406280
Constraints on Supergravity in the Light Gluino Scenario
Minimal $N=1$ supergravity with a radiatively broken electroweak symmetry group is studied in the light gluino scenario. Constraints from the $b\rightarrow s\gamma$ decay and from the masses of the light CP-even neutral Higgs $m_h$, the lightest chargino $m_{\chi^{\pm}_1}$, and the second lightest neutralino $m_{\chi^0...
1994-06-10
2009-09-25
[ "hep-ph" ]
Marco Aurelio Diaz
hep-ph/9406265
Beyond the black disk limit: antishadow scattering mode
The appearance of the antishadow scattering mode at Tevatron-Collider energies is considered on the basis of unitarity and geometrical notions on hadron interactions
1994-06-09
2007-05-23
[ "hep-ph" ]
S. M. Troshin, N. E. Tyurin
hep-ph/9406264
Phase of the Wilson Line at High Temperature in the Standard Model
We compute the effective potential for the phase of the Wilson line at high temperature in the standard model to one loop order. Besides the trivial vacua, there are metastable states in the direction of $U(1)$ hypercharge. Assuming that the universe starts out in such a metastable state at the Planck scale, it easily ...
1994-06-09
2009-10-28
[ "hep-ph" ]
Chris P. Korthals Altes, Kimyeong Lee, and Robert D. Pisarski
hep-ph/9406263
Quark Masses from Lattice QCD at the Next-to-Leading Order
Using the results of several quenched lattice simulations, we predict the value of the strange and charm quark masses in the continuum at the next-to-leading order, $m^{\overline{MS}}_s(\mu=2\,\, \rm{GeV})= (127 \pm 18)\,\, \rm{MeV}$ and $m^{\overline{MS}}_{ch}(\mu=2 \,\,\rm{GeV})=(1.47 \pm 0.28)\,\, \rm{GeV}$. The err...
1994-06-09
2009-10-28
[ "hep-ph", "hep-lat" ]
C.R. Allton, M. Ciuchini, M. Crisafulli, E. Franco, V. Lubicz and G. Martinelli
hep-ph/9406269
Deep Inelastic Electropion Production
This paper is devoted to a study of possible scaling laws, and their logarithmic corrections, occurring in deep inelastic electropion production. Both the exclusive and semi-exclusive processes are considered. Scaling laws, originally motivated from PCAC and current algebra considerations are examined, first in the fra...
1994-06-09
2007-05-23
[ "hep-ph", "hep-ex", "nucl-th" ]
A. Calogeracos, Norman Dombey, Geoffrey B. West
hep-ph/9406268
The 2-Loop Effective Potential of the 3d SU(2)-Higgs Model in a General Covariant Gauge
To study the convergence of the loop expansion at the high-temperature electroweak phase transition, we calculate the 2-loop effective potential of the 3d SU(2)-Higgs model in a general covariant gauge. We find that the loop expansion definitely breaks down for large $\xi$, but converges rather well for smaller values,...
1994-06-09
2010-11-01
[ "hep-ph" ]
M.Laine
hep-ph/9406267
Charge form factors of pseudoscalar mesons
The elastic charge form factors of the pion, kaon, D- and B-mesons are calculated within a relativistic constituent quark model formulated on the light-cone. Our parameter free predictions agree well with the available data. The results are approximately independent of the assumed form of the light-cone wave function, ...
1994-06-09
2011-04-15
[ "hep-ph" ]
Felix Schlumpf
hep-ph/9406266
Monte Carlo simulation of baryon and lepton number violating processes at high energies
We report results obtained with the first complete event generator for electroweak baryon and lepton number violating interactions at supercolliders. We find that baryon number violation would be very difficult to establish, but lepton number violation can be seen provided at least a few hundred L violating events are ...
1994-06-09
2009-10-28
[ "hep-ph" ]
M.J. Gibbs, A. Ringwald, B.R. Webber and J.T Zadrozny
hep-ph/9406262
Nonfactorizable Contributions to Nonleptonic Weak Decays of Heavy Mesons
Nonfactorizable contributions to exclusive two-body nonleptonic weak decays of heavy mesons arising from color octet currents, characterized by the parameter $r_2$, are extracted from the data. It is found that $r_2$ is equal to $\sim -0.67\,$, $-(0.9\sim 1.1),~-(1.2\sim 1.3)$, $\sim 0.36$ respectively for $D\to \bar{K...
1994-06-09
2009-10-28
[ "hep-ph" ]
Hai-Yang Cheng
hep-ph/9406270
Z Condensation and Standard Model Baryogenesis
The standard model satisfies Sakharov's conditions for baryogenesis but the CP violation in the KM matrix appears too small to account for the observed asymmetry. In this letter we explore a mechanism through which CP violation can be greatly amplified. First CP is {\it spontaneously} broken through dynamical effects...
1994-06-09
2008-02-03
[ "hep-ph", "astro-ph" ]
Salim Nasser and Neil Turok
hep-ph/9406260
The Parton Distribution Functions in the Limit $x_{Bj}\to 1$
We review both the counting rule and the influence of the evolution in $Q^2$ for the large $x_{Bj}$ behaviour of the valance quark distribution functions. Based on a factorization procedure we present a more general perturbative treatment to compute this behaviour. A complete analysis is performed in the scalar $\phi^3...
1994-06-09
2007-05-23
[ "hep-ph" ]
D. M\"uller
hep-ph/9406259
Light-Ray Operators and their Application in QCD
The nonperturbative parton distribution and wave functions are directly related to matrix elements of light-ray (nonlocal) operators. These operators are generalizations of the standard local operators known from the operator product expansion. The renormalization group equation for these operators leads to evolution e...
1994-06-08
2007-05-23
[ "hep-ph", "hep-th" ]
B. Geyer, D. M\"uller, D. Robaschik
hep-ph/9406250
Proton-Proton Elastic Scattering; Landshoff Contributions in the Diquark Model
Independent multiple scattering (`Landshoff') contributions to proton-proton elastic scattering at wide angles are calculated in the quark-diquark model. Results confirm previous observations about the magnitude of these contributions. The use of the quark-diquark model extends the applicability of perturbative QCD cal...
1994-06-08
2009-09-25
[ "hep-ph" ]
Rainer Jakob
hep-ph/9406254
A light stop and its consequences at the Tevatron and LEPII
An interesting prediction of a string-inspired {\em one-parameter} $SU(5)\times U(1)$ supergravity model, is the fact that the lightest member ($\tilde t_1$) of the top-squark doublet $(\tilde t_1,\tilde t_2)$, may be substantially lighter than the top quark. This sparticle ($\tilde t_1$) may be readily pair-produced a...
1994-06-08
2009-08-25
[ "hep-ph", "hep-ex" ]
J. Lopez, D. Nanopoulos, and A. Zichichi
hep-ph/9406256
Towards a dynamical determination of parameters in the Minimal Supersymmetric Standard Model
In the Minimal Supersymmetric Standard Model (MSSM), the scale $M_{SUSY}$ of soft supersymmetry breaking is usually {\em assumed} to be of the order of the electroweak scale. We reconsider here the possibility of treating $M_{SUSY}$ as a dynamical variable. Its expectation value should be determined by minimizing the v...
1994-06-08
2010-04-14
[ "hep-ph", "hep-th" ]
C.Kounnas, I.Pavel and F.Zwirner
hep-ph/9406253
SUSY GUTs without light Higgs bosons
There are two different types of perturbative unification in SUSY GUTs. Perturbative gauge unification is necessary for the extremely successful prediction of $\sin^2\theta_w$. ``Perturbative validity'' requires that {\it all} couplings (not just the gauge couplings) remain small; this assumption is essential to the pr...
1994-06-08
2008-02-03
[ "hep-ph" ]
Marc Sher
hep-ph/9406245
Low-Energy Effective Lagrangian in Unified Theories with Non-Universal Supersymmetry Breaking Terms
Supersymmetric grand unified theories with non-universal soft supersymmetry breaking terms are studied. By integrating out the superheavy fields at an unification scale, we compute their low-energy effective Lagrangian. We find new contributions to the scalar potential specific to the non-universal supersymmetry breaki...
1994-06-08
2009-09-29
[ "hep-ph" ]
Yoshiharu Kawamura, Hitoshi Murayama, and Masahiro Yamaguchi
hep-ph/9406249
Gauge-Coupling Unification and the Minimal SUSY Model: A Fourth Generation Below the Top?
We explore the possibility of a fourth generation in the gauge-coupling-unified, minimal supersymmetric (MSSM) framework. We find that a sequential fourth generation (with a heavy neutrino $\nu'$) can still fit, surviving all present experimental constraints, provided $\lambda_b(M_U)=\lambda_\tau(M_U)$ Yukawa unificati...
1994-06-08
2014-11-17
[ "hep-ph" ]
J.F. Gunion, Douglas W. McKay, and H. Pois
hep-ph/9406255
Measuring Parton Densities in the Pomeron
We present a program to measure the parton densities in the pomeron using diffractive deep inelastic scattering and diffractive photoproduction, and to test the resulting parton densities by applying them to other processes such as the diffractive production of jets in hadron-hadron collisions. Since QCD factorization ...
1994-06-08
2009-12-30
[ "hep-ph" ]
John Collins, Joey Huston, Jon Pumplin, Harry Weerts, and Jim Whitmore
hep-ph/9406258
Gauge independent transverse and longitudinal self-energies and vertices via the pinch technique
In the context of the Standard Model we show how to apply the pinch technique to four-fermion amplitudes with non-conserved external charged currents,in order to construct to one-loop order gauge independent self-energies and vertices. We discuss the technical difficulties arising due to the presence of longitudinal co...
1994-06-08
2009-10-28
[ "hep-ph" ]
Joannis Papavassiliou
hep-ph/9406252
Gluon and Charm Distributions in the Photon
We study systematically the sensitivity of the photon structure function data on the gluon contents of the photon, by using the leading order Altarelli--Parisi (AP) equations. Charm quark contribution is studied in the quark parton model and by using the massive quark AP equations of Gl\"uck, Hoffmann and Reya. The...
1994-06-08
2010-03-25
[ "hep-ph" ]
K. Hagiwara, T. Izubuchi, M. Tanaka and I. Watanabe
hep-ph/9406251
New Approach for Measuring $|V_{ub}|$ at Future $B$-Factories
It is suggested that the measurements of hadronic invariant mass ($m_X$) distributons in the inclusive $B \rightarrow X_{c(u)} l \nu$ decays can be useful in extracting the CKM matrix element $|V_{ub}|$. We investigated hadronic invariant mass distributions within the various theoretical models of HQET, FAC and chiral ...
1994-06-08
2010-11-01
[ "hep-ph" ]
C.S. Kim, Pyungwon Ko, Daesung Hwang and Wuk Namgung
hep-ph/9406261
Quark Pair Production in the Chiral Phase Transition
The production of quarks and antiquarks during a sudden restoration of chiral symmetry, as it might occur in very energetic heavy ion collisions, is considered. If gluons are already present they can assist additively to the overall production: real gluons are partially decaying during such a chiral transition. The tot...
1994-06-08
2009-10-28
[ "hep-ph" ]
Carsten Greiner
hep-ph/9406257
Measurement of the WW-Gamma Vertex Through Single Photon Production at e^+ e^- Colliders
We perform a detailed study of the process $e^+e^-\to\gamma\nu_l\bar\nu_l$ and its sensitivity to anomalous gauge boson couplings of the $\gamma WW$ vertex. We concentrate on LEP II energies, $\sqrt{s}=200$ GeV, and energies appropria- te to the proposed Next Linear Collider (NLC) high energy $e^+e^-$ collider with c.m...
1994-06-08
2014-11-17
[ "hep-ph" ]
G. Couture and S. Godfrey
hep-ph/9406244
Constraints on Four-Point Couplings in Low-Energy Meson Interactions
We investigate from first principles the introduction of isospin-1 vector and axial-vector fields into the nonlinear sigma model. Chiral symmetry is nonlinearly realised and spin-1 fields are assumed to transform homogeneously under chiral rotations. By requiring the Hamiltonian of the theory to be bounded from below w...
1994-06-07
2009-10-28
[ "hep-ph" ]
D. Kalafatis and M. C. Birse
hep-ph/9406246
Comparison of SO(10)-Symmetric Fermion Mass Matrices with and without Degenerate Neutrinos
It has been recently suggested by others that one can simultaneously explain the depletions of solar electron-neutrinos and atmospheric muon-neutrinos along with a 7 eV neutrino component of mixed dark matter by postulating the existence of nearly-degenerate 2 eV neutrinos with the correct mixing parameters. We study t...
1994-06-07
2007-05-23
[ "hep-ph" ]
Carl H. Albright and Satyanarayan Nandi
hep-ph/9406241
The Breaking of Subnuclear Democracy as the Origin of Flavour Mixing
It is shown that the simplest breaking of the subnuclear democracy leads to a successful description of the mixing between the second and third family. In the lepton channel the $\nu _{\mu } - \nu_{\tau }$ oscillations are expected to be described by a mixing angle of $2.65^ {\circ }$ which might be observed soon in ne...
1994-06-07
2009-10-28
[ "hep-ph" ]
Harald Fritzsch, Dirk Holtmannsp\"Otter
hep-ph/9406239
$b \rightarrow s \gamma$ AND $b \rightarrow s g$: A THEORETICAL REAPPRAISAL
We present upgraded theoretical predictions for inclusive and exclusive radiative decays of {\it B} mesons. Our results include those next-to-leading order corrections that have already been computed. Our best estimates in the Standard Model are $BR(B \rightarrow K^* \gamma)=(4.3 \pm 0.9^{ +1.4}_{-1.0}) \times 10^{-5}$...
1994-06-07
2009-10-28
[ "hep-ph" ]
M. Ciuchini, E. Franco, G. Martinelli, L. Reina and L. Silvestrini
hep-ph/9406243
Scaling behaviour of leptonic decay constants for heavy quarkonia and heavy mesons
In the framework of QCD sum rules one uses a scheme, allowing one to apply the conditions of both nonrelativistic heavy quark motion inside mesons and independence of nonsplitting nS-state density on the heavy quark flavours. In the leading order an analitic expression is derived for leptonic constants of both heavy qu...
1994-06-07
2007-05-23
[ "hep-ph" ]
V.V.Kiselev
hep-ph/9406238
Minimal String Unification and Yukawa Couplings in Orbifold Models
We study the minimal supersymmetric standard model derived from $Z_N \times Z_M$ orbifold models. Moduli dependent threshold corrections of the gauge couplings are investigated to explain the measured values of the coupling constants. Also we study Yukawa couplings of the models. We find that the $Z_2 \times Z_6'$, $Z_...
1994-06-07
2015-06-25
[ "hep-ph" ]
T.Kobayashi
hep-ph/9406242
Damping Rate of a Yukawa Fermion at Finite Temperature
The damping of a massless fermion coupled to a massless scalar particle at finite temperature is considered using the Braaten-Pisarski resummation technique. First the hard thermal loop diagrams of this theory are extracted and effective Green's functions are constructed. Using these effective Green's functions the dam...
1994-06-07
2009-10-28
[ "hep-ph" ]
Markus H. Thoma
hep-ph/9406247
Existence and Stability of Spinning Embedded Vortices
I show the existence of a new type of vortex solution which is non-static but stationary and carries angular momentum. This {\it spinning vortex} can be embedded in models with trivial vacuum topology like a model with $SU(2)_{global}\times U(1)_{local} \rightarrow U(1)_{global}$ symmetry breaking. The stability proper...
1994-06-07
2009-09-25
[ "hep-ph", "astro-ph" ]
Leandros Perivolaropoulos
hep-ph/9406248
Supersymmetry at the DiTevatron
We study the signals for supersymmetry at the Tevatron and DiTevatron ($\sqrt{s}=4\TeV$) in various well-motivated supersymmetric models. We consider the trilepton signature in the decay of pair-produced charginos and neutralinos, the missing energy signature in gluino and squark production, and the $b\bar b$ signal in...
1994-06-07
2011-08-17
[ "hep-ph", "hep-ex" ]
T. Kamon, J. Lopez, P. McIntyre, and J. White
hep-ph/9406240
Another Look at the Electroweak Vortex Solution
We discuss the position in configuration space of the electroweak vortex solution. (Talk given at the NATO Advanced Research Workshop "Electroweak Physics and the Early Universe", Sintra, Portugal, March 1994)
1994-06-07
2007-05-23
[ "hep-ph" ]
F. R. Klinkhamer
hep-ph/9406230
The Spectral Density Method Applied to the Hot Quantum Field Theories
The spectral density method being applied to the quantum field theory at finite temperature is revived and its possibilities are briefly discussed.
1994-06-06
2007-05-23
[ "hep-ph" ]
O.K.Kalashnikov
hep-ph/9406237
Pion Wave Function from QCD Sum Rules with Nonlocal Condensates
We investigate a model QCD sum rule for the pion wave function $\varphi_{\pi}(x)$ based on the non-diagonal correlator whose perturbative spectral density vanishes and $\Phi(x,M^2)$, the theoretical side of the sum rule, consists of condensate contributions only. We study the dependence of $\Phi(x,M^2)$ on the Borel pa...
1994-06-06
2007-05-23
[ "hep-ph" ]
Anatoly Radyushkin
hep-ph/9406232
Four fermion production in e+ e- annihilation
Four fermion processes at e+ e- colliders in a range of energy from 100 GeV to 1 TeV are discussed and examples of results obtained with an event generator presented. We also investigate the effects of the inclusion of initial state QED corrections and QCD contributions.
1994-06-06
2009-10-28
[ "hep-ph" ]
F.A. Berends, R. Kleiss and R. Pittau
hep-ph/9406236
Soft Pion Emission in Semileptonic $B$-Meson Decays
An analysis of semileptonic decays of $B$ mesons with the emission of a single soft pion is presented in the framework of the heavy-quark limit using an effective Lagrangian which implements chiral and heavy-quark symmetries. The analysis is performed at leading order of the chiral and inverse heavy mass expansions. In...
1994-06-06
2014-11-17
[ "hep-ph" ]
J. L. Goity and W. Roberts
hep-ph/9406234
Quantum Scattering and Classical Solutions
I discuss a formalism for computing quantum scattering amplitudes using a semiclassical expansion of a functional integral representation for the S-matrix. The classical background for the expansion is determined by solving the equations of motion subject to nontrivial boundary conditions determined by the initial and ...
1994-06-06
2007-05-23
[ "hep-ph", "hep-th" ]
Stephen D.H. Hsu
hep-ph/9406233
Four quark processes at LEP 200
In this paper I investigate the production of four quarks at LEP 200 energies. Effects due to initial state QED corrections and background diagrams, including QCD contributions, are studied and examples of results obtained with an event generator presented.
1994-06-06
2009-10-28
[ "hep-ph" ]
R. Pittau
hep-ph/9406231
Quantum Chromodynamics and Multiplicity Distributions
Quantum chromodymamics (QCD) approach to the problem of multiplicity distributions in high energy particle collisions is described. The solutions of QCD equations for generating functions of the multiplicity distributions in gluon and quark jets are presented for both fixed and running coupling constants. The newly fou...
1994-06-06
2010-12-17
[ "hep-ph" ]
I.M. Dremin (P.N.Lebedev Physical Institute, Moscow, Russia)
hep-ph/9406229
Why more hadronlike photons produce less particles on nuclear targets
In hadron-nucleus interactions, the stronger is nuclear shadowing in the total cross section the higher is the multiplicity of secondary hadrons. In deep inelastic scattering, nuclear shadowing at small $x$ is associated with the hadronlike behaviour of photons as contrasted to the pointlike behaviour in the non-shadow...
1994-06-05
2009-09-25
[ "hep-ph", "nucl-th" ]
N.N.Nikolaev, B.G.Zakharov and V.R.Zoller
hep-ph/9406218
Is the Standard Electroweak Theory Happy with $m_t\sim$ 174 GeV?
Based on the recent CDF report on the top-quark, we have carried out an analysis on the Higgs mass within the minimal standard electroweak theory using the latest data on the $W$-mass. Although this theory is in quite a happy situation now, we wish to point out that more precise measurements of $M_W$ and $m_t$ in the f...
1994-06-03
2015-06-25
[ "hep-ph" ]
Zenr\=o Hioki and Ryuichi Najima
hep-ph/9406220
Effective Meson Lagrangian with Chiral and Heavy Quark Symmetries from Quark Flavor Dynamics
By bosonization of an extended NJL model we derive an effective meson theory which describes the interplay between chiral symmetry and heavy quark dynamics. This effective theory is worked out in the low-energy regime using the gradient expansion. The resulting effective lagrangian describes strong and weak interaction...
1994-06-03
2009-10-28
[ "hep-ph" ]
D.Ebert, T.Feldmann, R.Friedrich, H.Reinhardt
hep-ph/9406221
Wopper, Version 1.1: A Monte Carlo Event Generator for Four Fermion Production at LEP-II and Beyond
We report on the status of the Monte Carlo event generator WOPPER. Version 1.1 of WOPPER describes four fermion production at LEP-II and beyond with leading logarithmic radiative corrections in the double W pole approximation. These approximations are appropriate for almost all practical purposes, but the inclusion of ...
1994-06-03
2010-11-11
[ "hep-ph" ]
Harald Anlauf, Hans D. Dahmen, Angelika Himmler, Panagiotis Manakos, Thomas Mannel and Thorsten Ohl
hep-ph/9406226
Heavy quark limit in the model with confined light quarks and infrared heavy quark propagators
We have studied the weak decay constants and the Isgur-Wise form factor of the B and D mesons in the heavy quark limit, by employing a relativistic quark confinement model. It is an attempt to improve our previous work within the same line of thinking, but by incorporating a couple of novel aspects. First, the infrared...
1994-06-03
2015-06-25
[ "hep-ph" ]
M. A. Ivanov (Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, Moscow, Russia) and T. Mizutani (Department of Physics Virginia Polytechnic Institute and State University Blacksburg, VA)
hep-ph/9406227
Decays of $\ell=1$ Baryons --- Quark Model versus Large-$N_c$
We study nonleptonic decays of the orbitally excited, \su6 \rep{70}-plet baryons in order to test the hypothesis that the successes of the nonrelativistic quark model have a natural explanation in the large-$N_c$ limit of QCD. By working in a Hartree approximation, we isolate a specific set of operators that contribute...
1994-06-03
2009-09-11
[ "hep-ph" ]
Christopher D. Carone, Howard Georgi, Lev Kaplan and David Morin
hep-ph/9406223
Bubble Nucleation in Theories with Symmetry Breaking by Radiative Corrections
A formalism is developed to calculate the bubble nucleation rate in theories where the symmetry breaking is by radiative corrections. Although to leading and next-to-leading order the result can be expressed in terms of the effective action of the theory, this is not true of the higher order corrections. In particular,...
1994-06-03
2009-09-25
[ "hep-ph" ]
Erick J. Weinberg
hep-ph/9406235
Single Leptoquark Production at Hadron Colliders
Leptoquarks can be produced in pairs by gluon--gluon fusion and quark--antiquark annihilation at hadron colliders. While HERA is the proper machine for single production of $(eu)$ and $(ed)$ type leptoquarks, the flavor species of ($\mu u$), ($\mu d$) and ($\tau u$), ($\tau d$) type leptoquarks can be produced at hadro...
1994-06-03
2009-10-28
[ "hep-ph" ]
J. Ohnemus, S. Rudaz, T.F. Walsh, and P.M. Zerwas
hep-ph/9406222
Polarization Rotation Effects due to Parity Violation in Atoms
We present a study of parity (P) violating polarization rotations of atoms in external electric fields. Five different types of rotations are identified and the consequences of time reversal invariance (T) are discussed. The role played by Zeldovich's electric dipole moment of unstable states is elucidated. To calculat...
1994-06-03
2015-06-25
[ "hep-ph", "nucl-th" ]
G.W. Botz, D. Bru{\ss}, O. Nachtmann
hep-ph/9406219
Model for anomalous $\Upsilon'' \to \Upsilon \pi \pi$ transition with account of chiral phase shift in hadron bag of quarkonium
We assume that a rather large bag of the $\Upsilon''(3S b\bar b)$ heavy quarkonium is in the phase of spontaneously broken chiral symmetry, in contrast to the $\Upsilon(1S b \bar b)$ hadron bag, having small size and being in the phase of exact chiral symmetry, so that the shift of the phases in the $\Upsilon'' \to \Up...
1994-06-03
2007-05-23
[ "hep-ph" ]
V.V.Kiselev and A.K.Likhoded
hep-ph/9406224
GUT effects in the soft supersymmetry breaking terms
In minimal supergravity theories the soft supersymmetry breaking (SSB) parameters are universal (flavor blind) near the Planck scale. Nevertheless, one often assumes universality at the grand-unification scale $M_{G} \approx 10^{16}$ GeV instead, and corrections to the SSB parameters arising from their evolution betwee...
1994-06-03
2011-07-19
[ "hep-ph" ]
Nir Polonsky and Alex Pomarol
hep-ph/9406228
Studies of Strong Electroweak Symmetry Breaking at Photon Colliders
It has recently been shown that the studies of strongly-interacting electroweak symmetry breaking (EWSB) at photon colliders, via photon splitting into $W$ pair followed by longitudinal $W$-boson scattering, could be possible. Here we present a signal-background analysis for the scattering channels $W^+_L W^-_L \to Z_L...
1994-06-03
2009-10-28
[ "hep-ph" ]
Kingman Cheung
hep-ph/9406225
An Upper Bound on the Higgs Boson Mass from Yukawa Unification and a Comment on Vacuum Stability Constraints
Only small regions in the $m_{t} - \tan\beta$ plane are allowed when considering simultaneously (assuming the MSSM) coupling constant unification and (minimal) GUT relations among Yukawa couplings (i.e., $h_{b} = h_{\tau}$ at the unification point). In particular, if $m_{t} \simle 175$ GeV we find that only $1 \simle \...
1994-06-03
2007-05-23
[ "hep-ph" ]
Nir Polonsky
hep-ph/9406216
The Photon Structure Function $F_2$ in QCD with Nonlocal Vacuum Quark Condensates
We calculate the contribution from nonlocal vacuum condensates of quark fields to the hadronic part of the photon structure function $F_2(x)$ in the operator product expansion approach to QCD. The result is a smooth function of $x$ and its magnitude is comparable with one of gluon condensate. Extrapolation to the case ...
1994-06-02
2008-02-03
[ "hep-ph" ]
A.P. Bakulev and S.V. Mikhailov
hep-ph/9406215
The Status of Molecules
This report summarizes the experimental and theoretical status of hadronic molecules, which are weakly-bound states of two or more hadrons. We begin with a brief history of the subject and discuss a few good candidates, and then abstract some signatures for molecules which may be of interest in the classification of po...
1994-06-02
2007-05-23
[ "hep-ph" ]
T.Barnes
hep-ph/9406212
Spin-dependent Parton Distributions from Polarized Structure Function Data
In the past year, polarized deep inelastic scattering experiments at CERN and SLAC have obtained structure function measurements off proton, neutron and deuteron targets at a level of precision never before achieved. The measurements can be used to test the Bjorken and Ellis-Jaffe sum rules, and also to obtain informat...
1994-06-02
2010-04-06
[ "hep-ph" ]
T.Gehrmann and W.J.Stirling
hep-ph/9406211
On the Pais--Treiman method to measure $\pi\pi$ phase shifts in $K_{e4}$ decays
We evaluate theoretical uncertainties to the method of Pais and Treiman to measure the $\pi\pi$ phase shifts in $K_{e4}$ decays. We find that they are very small, below $1\%$.
1994-06-02
2009-10-28
[ "hep-ph" ]
G. Colangelo, M. Knecht and J. Stern
hep-ph/9406217
Eikonal Wave Functions and Model Independent Exclusive B Decays
In this letter we investigate the proper normalization for the B meson eikonal valence wave function used in exclusive B decays. The normalization appropriate for a hard scattering process renormalized at the scale $\mu$ is determined by calculating the short distance contribution to the purely leptonic decay.
1994-06-02
2011-07-19
[ "hep-ph" ]
R. Akhoury and I.Z. Rothstein
hep-ph/9406214
Transformations of real-time finite-temperature Feynman rules
We consider transformations of the $2\times2$ propagator matrix in real-time finite-temperature field theory, resulting in transformed $n$--point functions. As special cases of such a transformation we examine the Keldysh basis, the retarded/advanced $RA$ basis, and a Feynman-like $F\bar F$ basis, which differ in this ...
1994-06-02
2009-10-28
[ "hep-ph" ]
M. A. van Eijck, R. Kobes, and Ch. G. van Weert
hep-ph/9406213
Comment on current correlators in QCD at finite temperature
We address some criticisms by Eletsky and Ioffe on the extension of QCD sum rules to finite temperature. We argue that this extension is possible, provided the Operator Product Expansion and QCD-hadron duality remain valid at non-zero temperature. We discuss evidence in support of this from QCD, and from the exactly so...
1994-06-02
2009-10-28
[ "hep-ph" ]
C. A. Dominguez and M. Loewe
hep-ph/9406206
Heavy Quarks from QCD Spectral Sum Rules
This is a short review of the present status of the dynamics of the heavy quarks extracted from QCD spectral sum rules. We discuss the determination of the ``perturbative" quark mass, the decay constants of the $D$ and $B$ mesons, the form factors of the semileptonic and radiative decays of the $B$ mesons, the slope of...
1994-06-01
2008-02-03
[ "hep-ph" ]
S. Narison
hep-ph/9406207
Beauty Quark Fragmentation Into Strange B Mesons
Using the recent measurement of the total production rate for $B_s$ and $B_s^*$ mesons in electron-positron annihilation to determine the strange quark mass parameter in the $\bar b\to B_s,\, B_s^*$ fragmentation functions we calculate the momentum distributions of the $B_s$ and $B_s^*$ mesons.
1994-06-01
2014-11-17
[ "hep-ph" ]
Kingman Cheung and Robert J. Oakes
hep-ph/9405432
Natural explanation for discrete R-symmetry in successful inflation in N=1 supergravity
Recently it was shown that discrete R-invariance in superpotential can lead to a successful flat potential in inflation. We suggest that this discrete R-symmetry arises from an underlying supersymmetric gauge theory, which gives rise to a scalar inflaton as a composite field. This discrete R-symmetry is common to the...
1994-06-01
2008-02-03
[ "hep-ph" ]
Tomohiro Matsuda
hep-ph/9406202
On the Determination of $a_1$ and $a_2$ from Hadronic Two Body $B$ Decays
{}From Class I decays : $B^o \ra \pi^+ ( \rho^+ ) + D^- ( {D^*}^- )$, we determine $a_1$, and from Class III decays : $B^+ \ra \pi^+ ( \rho^+ ) + \ol{D}^o ( {\ol{D}^*}^o )$, we determine an allowed domain in the $( a_1, a_2 )$ plane. We find that within one standard deviation errors, the allowed band of $a_1$ from Clas...
1994-06-01
2016-09-01
[ "hep-ph" ]
M. Gourdin, A.M Kamal, Y.Y.Keum and X.Y.Pham
hep-ph/9406201
Calculation of the Four-Quark Condensates in the QCD Motivated Nambu-Jona- Lasinio Model
The four-quark condensates appearing in QCD sum rule are calculated nonperturbatively in a realistic QCD motivated extended Nambu-Jona-Lasinio model. The calculation is in the framework of the effective potential for local composite operators up to next-to-the-leading order in the 1/N expansion in which the non-factori...
1994-06-01
2009-10-28
[ "hep-ph" ]
Qing Wang, Yu-Ping Kuang, Yu-Ping yi, and Tian-Fang Cai
hep-ph/9406205
Electroweak effective lagrangians
In this paper I review several aspects of the use of effective lagrangians in (mainly) electroweak physics. The conditions under which this approach is reliable and useful, as well as the limitations of the formalism are detailed. Various applications are also presented.
1994-06-01
2015-06-25
[ "hep-ph" ]
Jose Wudka
hep-ph/9406208
Probing quark gluon plasma with jets
We study multiple scatterings of jets on constituents of quark gluon plasma and introduce energy--energy correlations to quantify their effects. The effects from a longitudinally expanding plasma on medium as well as high energy jets are found to be significant at both RHIC and LHC energies. Because jets escape from th...
1994-06-01
2009-10-28
[ "hep-ph", "nucl-th" ]
Jicai Pan and Charles Gale
hep-ph/9406204
Gauge Invariance of Green Functions: Background-Field Method versus Pinch Technique
Application of the background-field method to QCD and the electroweak Standard Model yields gauge-invariant effective actions giving rise to simple Ward identities. Within this method, we calculate the quantities that have been treated in the literature using the pinch technique. Putting the quantum gauge parameter equ...
1994-06-01
2008-11-26
[ "hep-ph" ]
A. Denner, S. Dittmaier and G. Weiglein
hep-ph/9405430
Exponentiation of soft photons in a process involving hard photons
We present a simple method of removing the singularities associated with soft photon emission to all orders in perturbation theory through exponentiation, while keeping a consistent description of hard photon emission. We apply this method to the process e+ e- --> mu+ mu- + n photons where we include both Z^0 and photo...
1994-06-01
2011-07-19
[ "hep-ph" ]
D.J. Summers
hep-ph/9406203
QCD corrections to electroweak processes in an unconventional scheme: application to the b -> s gamma decay
In this work we give a detailed description of a method for the calculation of QCD corrections to electroweak processes in dimensional regularization that does not require any definition of the gamma_5 matrix in d dimensions. This method appears particularly convenient in order to limit the algebraic complexity of high...
1994-06-01
2009-10-28
[ "hep-ph" ]
Giancarlo Cella, Giuseppe Curci, Giulia Ricciardi and Andrea Vicere'
hep-ph/9406209
Baryons in the Large N Limit
The properties of baryons can be computed in a systematic expansion in $1/N_c$, where $N_c$ is the number of colors. Recent results on the axial couplings and masses of baryons (for the case of three flavors) are presented. The results give insight into the structure of flavor $SU(3)$ breaking for baryons. ------------...
1994-06-01
2009-09-25
[ "hep-ph" ]
Aneesh V. Manohar
hep-ph/9405431
Baryon Magnetic Moments in the 1/N Expansion
Relations among the baryon magnetic and transition magnetic moments are derived in the $1/N_c$ expansion. Relations which hold to ALL ORDERS in $SU(3)$ breaking and to leading and first subleading orders in the $1/N_c$ expansion are obtained. Additional relations are found which are valid up to $SU(3)$ breaking at firs...
1994-06-01
2009-09-25
[ "hep-ph" ]
Elizabeth Jenkins and Aneesh V. Manohar
hep-ph/9406210
The Chiral Phase Transition and Instanton Anti-instanton Molecules
We explore the idea that the chiral phase transition in QCD can be described as a transition from a disordered instanton liquid to a strongly correlated phase of polarized instanton anti-instanton molecules. We find a number of non perturbative effects caused by the presence of instantons above T_c, among them the fact...
1994-06-01
2010-11-01
[ "hep-ph", "hep-lat" ]
T. Schaefer, E. Shuryak and J. Verbaarschot
hep-ph/9405425
Radiative Leptonic Decays of Heavy Mesons
We compute the photon spectrum and the rate for the decays $B(D)\to l\nu_l\gamma$ These photonic modes constitute a potentially large background for the purely leptonic decays which are used to extract the heavy meson decay constants. While the rate for $D\to l\n\g$ is small, the radiative decay in the $B$ meson case c...
1994-05-31
2009-09-25
[ "hep-ph", "nucl-th" ]
G. Burdman, T. Goldman and D. Wyler
hep-ph/9405427
Bounding Effective Operators at the One-Loop Level: The Case of Four-Fermion Neutrino Interactions
The contributions of non-standard four-neutrino contact interactions to electroweak observables are considered at the one-loop level by using the effective quantum field theory. The analysis is done in terms of three unknown parameters: the strength of the non-standard neutrino interactions, $\tilde{F}$, an additional ...
1994-05-31
2009-10-28
[ "hep-ph" ]
Mikhail Bilenky and Arcadi Santamaria
hep-ph/9405426
Single spin asymmetry in inclusive pion production, Collins effect and the string model
We calculate the single spin asymmetry in the inclusive pion production in proton-proton collisions. We generate the asymmetry at the level of fragmentation function (Collins effect) by the Lund coloured string mechanism. We compare our results with the Fermilab E704 data from polarized proton-proton collisions at 200 ...
1994-05-31
2009-09-25
[ "hep-ph" ]
X. Artru, J. Czyzewski, H. Yabuki
hep-ph/9405429
Nambu mass hierarchies in strings
We show that a recent proposal by Nambu to generate a hierarchy among Yukawa couplings in the standard model may be easily implemented in superstring models. In such models, two of the main ingredients of the Nambu proposal find a natural explanation: minimising with respect to the Yukawas amounts to a minimisation wit...
1994-05-31
2009-07-22
[ "hep-ph" ]
P. Binetruy and E. Dudas
hep-ph/9405424
Finite Temperature Reduction of the SU(2) Higgs-Model with Complete Static Background
Direct evaluation of the 1-loop fluctuation determinant of non-static degrees of freedom in a complete static background is advocated to be more efficient for the determination of the effective three-dimensional model of the electroweak phase transition than the one-by-one evaluation of Feynman diagrams. The relation o...
1994-05-31
2011-08-11
[ "hep-ph" ]
A. Jakov\'ac and A. Patk\'os
hep-ph/9405421
Standard Model Predictions for Weak Boson Pair Production in E-E- Scattering
We study polarized $e^-e^-$ scattering into $\WW$, $\WZ$ and $\ZZ$ final states within the framework of the standard model of electroweak interactions. These mechanisms for producing pairs of weak gauge bosons are potential backgrounds to new reactions beyond the realm of the standard model. At a centre-of-mass energy ...
1994-05-31
2009-10-28
[ "hep-ph" ]
Frank Cuypers, Karol Kolodziej, Reinhold Rueckl
hep-ph/9405413
An algebraic approach to Z-Factors
We sketch a systematic approach to multiloop calculations. We focus on the Z-factors of a renormalizable theory and show that they can be obtained by purely algebraic methods based on power-counting and the forest structure of the divergent graphs. (submitted contributions to the conference proceedings "Confronting the...
1994-05-31
2007-05-23
[ "hep-ph" ]
Dirk Kreimer
hep-ph/9405423
New representation of two-loop propagator and vertex functions
We present a new method of calculating scalar propagator and vertex functions in the two-loop approximation, for arbitrary masses of particles. It is based on a double integral representation, suitable for numerical evaluation. Real and imaginary parts of the diagrams are calculated separately, so that there is no need...
1994-05-31
2007-05-23
[ "hep-ph" ]
Andrzej Czarnecki, Ulrich Kilian and Dirk Kreimer
hep-ph/9405422
Fermion Scattering off Electroweak Bubble Wall and Baryogenesis
By treating CP-violating interaction as a perturbative term, we solve the Dirac equation in the background of electroweak bubble wall (the distorted wave Born approximation). We obtain the transmission and reflection coefficients for a chiral fermion incident from the symmetric-phase region and for the one from the bro...
1994-05-31
2009-09-25
[ "hep-ph" ]
K.Funakubo, A.Kakuto, S.Otsuki, K.Takenaga and F.Toyoda
hep-ph/9405428
Flavour in supersymmetric Grand Unification: a democratic approach
We consider the flavour problem in a supersymmetric Grand Unified theory with gauged SU(6) group, where the Higgs doublets are understood as pseudo-Goldstone bosons of a larger $\SU(6)\otimes\SU(6)$ global symmetry of the Higgs superpotential. A key element of this work is that we never appeal to any flavour symmetry. ...
1994-05-31
2009-10-09
[ "hep-ph" ]
R. Barbieri, Z. Berezhiani, G. Dvali, L. Hall and A. Strumia
hep-ph/9405420
Minimal String Unification and Constraint on Hidden Sector
We examine whether a minimal string model possessing the same massless spectra as the MSSM can be obtained from $Z_4$, $Z_6$ and $Z_8$ orbifold constructions. Using an anomaly cancellation condition of the target space duality symmetry, we derive allowable values of a level $k_1$ of U(1)$_Y$ for the minimal string mode...
1994-05-31
2011-07-19
[ "hep-ph" ]
H.Kawabe, T.Kobayashi and N.Ohtsubo
hep-ph/9405417
Neutralinos as Dark Matter Candidates
We review some properties of the neutralino as a candidate for dark matter in the Universe. After presentation of evaluations for the neutralino relic abundance, possibilities for its direct and indirect detections are discussed, with emphasis for measurements at neutrino telescopes.
1994-05-30
2007-05-23
[ "hep-ph", "astro-ph" ]
A.Bottino, N.Fornengo, G.Mignola and S.Scopel
hep-ph/9405414
Quarkonium Interactions in Hadronic Matter
The cross section for the \J~and \U~interaction with light hadrons is calculated in short-distance QCD, based on the large heavy quark mass and the resulting large energy gap to open charm or beauty. The low energy form of the cross section is determined by the gluon structure functions at large $ x$; hence it remains ...
1994-05-30
2009-10-28
[ "hep-ph" ]
D. Kharzeev and H. Satz
hep-ph/9405409
Dual solutions of Yang-Mills field theories in Minkowski space
Using spherical ansatz, we construct dual equations for non-abelian gauge fields in Minkowski space. The analytically continued instanton is shown to satisfy the dual equations but assumes a more ansatz. It is not the solution of MIT second order differential equation. The symmetries of the solution function space are ...
1994-05-30
2007-05-23
[ "hep-ph" ]
Liang-Xin Li and Bing-Lin Young
hep-ph/9405419
Is the stop mass below the top mass?
It is shown that a top mass of 174+/-17 GeV, as quoted recently by the CDF Collaboration, constrains the mixing angle between the Higgs doublets in the Minimal Supersymmmetric extension of the Standard Model (MSSM) to: 1.2<tan beta<5.5 at the 90% C.L.. The most probable value corresponds to tan beta = 1.56; such a smal...
1994-05-30
2011-07-19
[ "hep-ph" ]
W. de Boer, R. Ehret and D. I. Kazakov
hep-ph/9405410
Sum Rules for Heavy Flavor Transitions in the SV Limit
We show how sum rules for the weak decays of heavy flavor hadrons can be derived as the moments of spectral distributions in the small velocity (SV) limit. This systematic approach allows us to determine corrections to these sum rules, to obtain new sum rules and it provides us with a transparent physical interpretatio...
1994-05-30
2010-11-01
[ "hep-ph" ]
I.I. Bigi, M. Shifman, N.G. Uraltsev and A. Vainshtein
hep-ph/9405408
On the vacuum theta angle in Yang-Mills field theories
Recently, MIT group found a numerical solution to non-abelian gauge fields which is shown to contain non-integer topological number. Using this fact, V.V.Khoze has argued that the vacuum theta angle is zero. Here, we study this in a complimentary way--its physical respect. The key point is MIT solution has an infinite ...
1994-05-30
2007-05-23
[ "hep-ph" ]
Liang-Xin Li and Bing-Lin Young
hep-ph/9405418
Massive two--loop diagrams: The Higgs propagator
Formulae are provided to express any two-loop scalar integral with arbitrary masses and arbitrary external momenta in terms of an integral of one fairly simple function or of its derivatives. Such integrals can be calculated numerically with high precision. Good agreement is found with known analytical expressions of s...
1994-05-30
2009-10-28
[ "hep-ph" ]
A. Ghinculov and J.J. van der Bij
hep-ph/9405415
Aspects of Standard Models with Two Higgs Doublets
We {works done in collaboration with C.S.Kim, Yonsei Univ., Seoul, Korea} present some properties of the SM with two Higgs doublets. Unlike the minimal SM, the Yukawa couplings (in the usual ``type II'' model) converge with the increasing energy to flavor democracy (FD), i.e.~to common values, in a specific flavor basi...
1994-05-30
2009-09-25
[ "hep-ph" ]
G.Cvetic
hep-ph/9405412
The Equivalence Theorem for the Heavy-Higgs Standard Model and the Gauged Nonlinear Sigma-Model
The equivalence theorem states that the leading part of the amplitude for a process with external longitudinally polarized vector bosons is given by the amplitude in which the longitudinal vector bosons are replaced by the corresponding pseudo-Goldstone bosons. The validity of this theorem within the standard model wit...
1994-05-30
2009-10-28
[ "hep-ph", "hep-th" ]
Carsten Grosse-Knetter (Universitaet Bielefeld)
hep-ph/9405416
Quark-Lepton Flavor Democracy and the Non-Existence of the Fourth Generation
In the Standard Model with two Higgs doublets (type II), which has a consistent trend to a flavor gauge theory and its related flavor democracy in the quark and the leptonic sectors (unlike the minimal Standard Model) when the energy of the probes increases, we impose the mixed quark-lepton flavor democracy at high ``t...
1994-05-30
2009-10-28
[ "hep-ph" ]
G.Cvetic and C.S.Kim