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hep-lat/9401006
Spherically-Symmetric Random Walks in Noninteger Dimension
A previous paper (hep-lat/9311011) proposed a new kind of random walk on a spherically-symmetric lattice in arbitrary noninteger dimension $D$. Such a lattice avoids the problems associated with a hypercubic lattice in noninteger dimension. This paper examines the nature of spherically-symmetric random walks in detail....
1994-01-09
2009-10-22
[ "hep-lat" ]
C. M. Bender, S. Boettcher, M. Moshe
hep-lat/9401005
A Few Points on Point-to-Point Correlation Functions
The short-time regime of QCD two-point correlation functions is examined through a QCD-Sum-Rule-inspired continuum model. QCD Sum Rule techniques are tested and alternate nucleon interpolating fields are discussed. The techniques presented here may be of practical use in determining heavy-light meson decay constants.
1994-01-07
2009-10-22
[ "hep-lat", "hep-ph" ]
Derek B. Leinweber
hep-lat/9401004
Computing the Slope of the Isgur-Wise Function
We propose a method for evaluating the slope (and higher derivatives) of the Isgur-Wise function at the zero recoil point using lattice simulations. These derivatives are required for the extrapolation of the experimental data for $B\rightarrow D^*l\bar\nu$ decays to the zero recoil point, from which the $V_{cb}$ eleme...
1994-01-06
2009-10-09
[ "hep-lat" ]
U.Aglietti, G.Martinelli and C.T.Sachrajda
hep-lat/9401003
The Nambu-Jona-Lasinio model with staggered fermions
We investigate the neighbourhood of the chiral phase transition in a lattice Nambu--Jona-Lasinio model, using both Monte Carlo methods and lattice Schwinger-Dyson equations.
1994-01-06
2008-11-26
[ "hep-lat" ]
A. Ali Khan, M. Goeckeler, R. Horsley, P.E.L. Rakow, G. Schierholz and H. Stueben
hep-lat/9401002
Ising-link Quantum Gravity
We define a simplified version of Regge quantum gravity where the link lengths can take on only two possible values, both always compatible with the triangle inequalities. This is therefore equivalent to a model of Ising spins living on the links of a regular lattice with somewhat complicated, yet local interactions. T...
1994-01-04
2009-10-22
[ "hep-lat" ]
Tom Fleming, Mark Gross and Ray Renken
hep-lat/9401001
Hadronic coupling constants in lattice QCD
We report on calculations of the hadronic coupling constants $g_{\rho\pi\pi}$ and $g_{nn\pi}$ based on lattice QCD with four flavors of dynamical staggered fermions. By computing 2--point and 3--point Green's functions we have been able to determine these coupling constants ab initio from QCD; the results are compatibl...
1994-01-03
2009-10-22
[ "hep-lat" ]
R. Altmeyer, M. Goeckeler, R. Horsley, E. Laermann, G. Schierholz and P.M. Zerwas
hep-ph/9412390
Perspective on Quark Mass and Mixing Relations
Recent data indicate that $V_{ub}\cong \lambda^4 \cong (0.22)^4$, while $m_t$ seems to be $174$ GeV. The relations $m_d/m_s\sim m_s/m_b \sim \delta \sim \lambda^2 \simeq \vert V_{cb}\vert$ and $m_u/m_c\sim m_c/m_t \sim \delta^2 \sim \lambda^4 \sim \vert V_{ub}\vert$ suggest that %a plausible clean separation of the %or...
1994-12-31
2010-11-01
[ "hep-ph" ]
Wei-Shu Hou and Gwo-Guang Wong
hep-ph/9412396
Field Theoretic Description of High Energy Neutrino Interactions
In this paper we begin the development of a formalism for the description of high energy neutrino interactions. It is based upon field theory quantized on a null plane. We set up the general formalism as well as some techniques needed to perform phenomenological calculations. We show that the formalism developed by W...
1994-12-31
2007-05-23
[ "hep-ph" ]
G. Domokos and S. Kovesi-Domokos (Johns Hopkins Univ)
hep-ph/9412395
Hyperintermittency ?
The analogy between the intermittency and scaling in statistical physics is extended to the case of more variables. It is shown that the inclusive densities predicted by the perturbative QCD obey generalized homogeneity principle which leads to many consequences in statistical physics. In particular the hyperscaling ma...
1994-12-31
2007-05-23
[ "hep-ph" ]
J. Wosiek (Jagellonian University, Cracow)
hep-ph/9412394
Heavy Quark Effective Theory on the Light Front
The light-front heavy quark effective theory is derived to all orders in $1/m_Q$. In the limit $m_Q\rightarrow \infty$, the theory exhibits the familiar heavy quark spin-flavor symmetry. This new formalism permits a straightforward canonical quantization to all orders in $1/m_Q$; moreover, higher order terms have rathe...
1994-12-31
2015-06-25
[ "hep-ph" ]
Wei-Min Zhang, Guey-Lin Lin and Chi-Yee Cheung
hep-ph/9412391
Violation of the Energy Conservation Law in Lorentz-Dirac Equations for More Than One Charge
An exact solution of Lorentz-Dirac equations where the energy conservation law is violated, is described herein for the case of two charges.
1994-12-30
2009-09-25
[ "hep-ph" ]
Danilo Villarroel and Rodrigo Rivera
hep-ph/9412389
Interference Rate of Radiation of 2 Charges in Circular Motion
We present an exact formula for the computation of the interference rate of radiation in the case of two charges revolving with constant angular velocity at opposite ends of a diameter in a fixed circle. The formula is valid for arbitrary velocities of the charges, and can be easily studied by numerical methods, even f...
1994-12-30
2009-09-25
[ "hep-ph" ]
Danilo Villarroel and Rodrigo Rivera
hep-ph/9412392
The $\pi\pi$ scattering amplitude in chiral perturbation theory
We discuss $\pi\pi$ scattering in the framework of chiral perturbation theory. In particular, we recall the predictions made some time ago for the threshold parameters and for the phase shift difference $\delta_0^0-\delta_1^1$.
1994-12-30
2007-05-23
[ "hep-ph" ]
J. Gasser
hep-ph/9412393
CP asymmetry Relations Between $\bar B^0\rightarrow \pi\pi$ and $\bar B^0\rightarrow \pi K$ Rates
We prove that CP violating rate difference $\Delta (\bar B^0 \rightarrow \pi^+\pi^-) = \Gamma (\bar B^0 \rightarrow \pi^+\pi^-) - \Gamma ( B^0 \rightarrow \pi^-\pi^+)$ is related to $\Delta (\bar B^0 \rightarrow \pi^+ K^-) = \Gamma (\bar B^0 \rightarrow \pi^+K^-) - \Gamma (B^0 \rightarrow \pi^-K^+)$ in the three genera...
1994-12-30
2008-11-26
[ "hep-ph" ]
N.G. Deshpande and Xiao-Gang He (University of Oregon)
hep-ph/9412385
Yukawa Textures and Anomalies
We augment the Minimal Supersymmetric Standard Model with a gauged family-dependent $U(1)$ to reproduce Yukawa textures compatible with experiment. In the simplest model with one extra chiral electroweak singlet field, acceptable textures require this $U(1)$ to be anomalous. The cancellation of its anomalies by a gener...
1994-12-29
2009-10-28
[ "hep-ph", "hep-th" ]
Pierre Binetruy (Orsay) and Pierre Ramond (Univ Florida, Gainesville)
hep-ph/9412386
A survey of phenomenological constraints on supergravity models
We advocate the study of supergravity models as well motivated few-parameter low-energy supersymmetric models. In this context we survey a broad range of phenomenological constraints and future tests, including present and near-future Tevatron ($\tilde q,\tilde g,\chi^\pm_1,\tilde t_1$) and LEP ($h,\chi^\pm_1$) mass li...
1994-12-29
2007-05-23
[ "hep-ph" ]
J. Lopez
hep-ph/9412387
Superstrings:The View from Below
We review the Standard Model in a form conducive to formulating its possible short distance extensions. This depends on the value of the Higgs mass, the only unknown parameter of the model. We suggest methods to reproduce many of the small numbers in the model in terms of scale ratios, applying see-saw like ideas to th...
1994-12-29
2015-06-25
[ "hep-ph" ]
P. Ramond (Univ Florida, Gainesville)
hep-ph/9412384
Angular structure of QCD jets
We derive the angular correlation functions between an arbitary number of partons inside a quark or gluon jet emerging from a high energy hard collision. As an application results for the correlation in the relative angle between two partons as well as the multiplicity moments of any order for partons in a sidewise ang...
1994-12-29
2009-10-28
[ "hep-ph" ]
Wolfgang Ochs (Max-Planck-Institute fur Physik, Munich) and Jacek Wosiek (Jagellonian University, Cracow)
hep-ph/9412388
The Concept of Potential in Quantum Field Theory
In quantum field theory the concept of a Lagrangian interaction density, expressed in terms of fields, is primary. Forces between two particles are regarded as arising primarily from the exchange of quanta of the bosonic fields. Thus, in contrast to nonrelativistic quantum mechanics, the concept of a two-body poten tia...
1994-12-29
2008-02-03
[ "hep-ph", "nucl-th" ]
J. Sucher
hep-ph/9412383
Selection Rule for Generation Numbers and Gauge Anomalies for Unification Groups
The possibilities of global (non-perturbative) gauge anomalies for a class of gauge groups are investigated. Intimately connected to branching rules and topological aspect of gauge groups, the results are applied to the study of unification gauge groups such as SO(10), SU(5), $E_6$, $E_8$ etc. Especially, we discuss ex...
1994-12-29
2014-11-17
[ "hep-ph" ]
Huazhong Zhang
hep-ph/9412378
Four-Quark States and Nucleon-Antinucleon Annihilation within the Quark Model with Instanton Induced Interaction
The spectrum of $q^2\bar q^2, J^p=0^+,2^+$ mesons is discussed. We have shown that due to instanton - induced forces the physical states are strong mixtures of the $SU_f(3)$ group basis states. The cross-sections for annihilation of the $N\bar N$ system into $(q^2\bar q^2)(q\bar q)$ mesons are obtained. The $a_0(980)$ ...
1994-12-28
2011-07-19
[ "hep-ph" ]
A. E. Dorokhov, N. I. Kochelev, Yu. A. Zubov
hep-ph/9412382
QCD corrections to scalar quark pair production in e+e- annihilation
We calculate the QCD radiative corrections to the production of supersymmetric scalar partners of quarks in e+e- annihilation. We include both the standard gluonic corrections and the genuine supersymmetric QCD corrections due to quark--gluino loops, and allow for mixing between left-- and right--handed scalar quarks w...
1994-12-28
2009-10-28
[ "hep-ph" ]
A. Arhrib, M. Capdequi-Peyranere and A. Djouadi
hep-ph/9412380
Two-loop electroweak top corrections: are they under control?
The assumption that two-loop top corrections are well approximated by the $O(G_mu^2 mt^4)$ contribution is investigated. It is shown that in the case of the ratio neutral-to-charged current amplitudes at zero momentum transfer the $O(G_mu^2 mt^2 M_Z^2)$ terms are numerically comparable to the $m_t^4$ contribution for r...
1994-12-28
2009-10-28
[ "hep-ph" ]
G. Degrassi, S. Fanchiotti, F. Feruglio, P.Gambino, A.Vicini
hep-ph/9412377
Fermi motion parameter $p_{_F}$ of $B$ meson from relativistic quark model
The Fermi motion parameter $p_{_F}$ is the most important parameter of ACCMM model, and the value $p_{_F} \sim 0.3$ GeV has been used without clear theoretical or experimental evidence. So, we attempted to calculate the value for $p_{_F}$ theoretically in the relativistic quark model using quantum mechanical variationa...
1994-12-28
2009-09-25
[ "hep-ph" ]
D.S. Hwang, C.S. Kim and W. Namgung
hep-ph/9412381
Two Gluon Exchange Model Predictions for Double Pomeron Jet Production
I extend the two gluon exchange picture of elastic scattering, known as the Low-Nussinov or Subtractive Quark Model, to predict cross sections for double pomeron exchange processes. In particular, I calculate p p-bar to p p-bar q q-bar where the q q-bar partons appear as jets separated from the final p and p-bar by lar...
1994-12-28
2009-10-28
[ "hep-ph" ]
Jon Pumplin (Michigan State University)
hep-ph/9412379
Constraints on the Minimal SUSY SO(10) Model from Cosmology and the $b\to s \gamma$ Decay
It is shown that the minimal supersymmetric SO(10) model with electroweak radiative breaking and universal soft mass terms at the GUT scale is strongly disfavoured by the combination of constraints from the $b\to s \gamma$ decay and the condition $\Omega h^2 < 1$ for the lightest (stable) neutralino. The constraints ar...
1994-12-28
2011-01-27
[ "hep-ph" ]
F.M. Borzumati, M. Olechowski and S. Pokorski
hep-ph/9412376
Measuring~~$|V_{ub}|$~~at~~the~~LEP/SLC
We show that the observation of energetic charged leptons from semileptonic $B$-meson decays at the LEP and SLC $Z$--boson factories offers a unique opportunity to measure the quark mixing matrix element $|V_{ub}|$. We present various distributions of the $B$ decay products to show that the $b \to u$ decays can be clea...
1994-12-28
2009-09-25
[ "hep-ph" ]
C.S. Kim and A.D. Martin
hep-ph/9412374
Polarization of $\tau$ lepton from scalar tau decay as a probe of neutralino mixing
The $\tau$ lepton arising from the scalar tau ($\st$) decay is naturally polarized. $\ptau$ depends on the left--right mixing of the $\st$ and the gaugino--higgsino mixing of the neutralino. The polarization $\ptau$ could be measured from the energy distribution of the decay products of $\tau$ at future $\epem$ collide...
1994-12-27
2009-10-28
[ "hep-ph" ]
Mihoko M. Nojiri
hep-ph/9412375
Evanescent Operators, Scheme Dependences and Double Insertions
The anomalous dimension matrix of dimensionally regularized four-quark operators is known to be affected by evanescent operators, which vanish in $D=4$ dimensions. Their definition, however, is not unique, as one can always redefine them by adding a term proportional to $(D-4)$ times a physical operator. In the present...
1994-12-27
2015-06-25
[ "hep-ph", "hep-th" ]
Stefan Herrlich, Ulrich Nierste
hep-ph/9412373
From Effective Lagrangians, to Chiral Bags, to Skyrmions with the Large-N_c Renormalization Group
We explicitly relate effective meson-baryon Lagrangian models, chiral bags, and Skyrmions in the following way. First, effective Lagrangians are constructed in a manner consistent with an underlying large-N_c QCD. An infinite set of graphs dress the bare Yukawa couplings at *leading* order in 1/N_c, and are summed usin...
1994-12-26
2010-11-01
[ "hep-ph", "hep-lat", "nucl-th" ]
Nicholas Dorey and Michael Mattis
hep-ph/9412372
Solving SUSY GUT Problems: Gauge Hierarchy and Fermion Masses
The supersymmetric $SU(6)$ model accompanied by the flavour-blind discrete symmetry $Z_3$ can succesfully deal with such key problems of SUSY GUTs, as are the gauge hierarchy/doublet-triplet splitting, $\mu$-problem and flavour problem. The Higgs doublets arise as Goldstone modes of the spontaneously broken {\em accide...
1994-12-26
2008-02-03
[ "hep-ph" ]
Zurab Berezhiani
hep-ph/9412370
Top Quark Signature in Extended Color Theories
We consider the implications of an extended color group, $SU\left( 3\right) _I\times SU\left( 3\right) _{II}$, spontaneously broken to $SU\left( 3\right) _c$ at a TeV or lower scale, for the hadronic colliders. The associated massive color octet gauge bosons (the colorons) can enhance the $t \overline{t}$ pair producti...
1994-12-26
2009-10-28
[ "hep-ph" ]
D.A.Dicus, B.Dutta and S.Nandi
hep-ph/9412371
${\bar p} p$ Annihilation: Manifestations of Instanton Induced Quark Pair Production ?
Production of strangeness in the low-energy ${\bar p} p$ annihilation is analyzed as a manifestation of the instanton induced multiquark vertex. Approach based on the {\it qualitative} properties of the 't Hooft mechanism provides a unified description of available experimental data on $K$- and $\phi$-meson production....
1994-12-26
2007-05-23
[ "hep-ph" ]
M. Polyakov and M. Shmatikov
hep-ph/9412369
Nonperturbative Evaluation of the Sphaleron Transition Rate
We review nonperturbative calculations of the rate of sphaleron transitions on the lattice in $1+1$-dimensional field theories and introduce a way to perform the gauge-invariant Gibbs averages in the classical non-Abelian Higgs theories.
1994-12-24
2009-09-25
[ "hep-ph" ]
A. Bochkarev
hep-ph/9412365
Multi-Majoron Modes for Neutrinoless Double-Beta Decay
We construct two new classes of models for double beta decay, each of which leads to an electron spectrum which differs from the decays which are usually considered. One of the classes has a spectrum which has not been considered to date, and which is softer than the usual two-neutrino decay of the Standard Model. We c...
1994-12-23
2009-10-28
[ "hep-ph" ]
P. Bamert, C.P. Burgess and R.N. Mohapatra
hep-ph/9412366
QCD Sum Rules For Pion Wave Function Revisited
We analyze new QCD sum rules for the pion wave function $\phi_{\pi}(x)$, obtained recently by A.V. Radyushkin in the framework of the non-local vacuum condensates method for non-diagonal correlators, and suggest a new approach for extracting wave functions of the $\pi$-meson and of its first resonances. As a result we ...
1994-12-23
2016-09-01
[ "hep-ph" ]
A.P. Bakulev and S.V. Mikhailov
hep-ph/9412368
Electroweak Physics at LEP
We have examined the evidence for the electroweak radiative corrections in the LEP precision data sets of 1993 and 1994 along with the intriguing possibility that the QED corrections only may be sufficient to fit the data within the framework of the minimal standard model. We find that the situation is very sensitive t...
1994-12-23
2009-09-25
[ "hep-ph" ]
Kyungsik Kang (Brown University) and Sin Kyu Kang (Seoul National U.)
hep-ph/9412367
Models of Fermion Mass Matrices Based on a Flavor- and Generation-Dependent U(1) Gauge Symmetry
We study models of fermion mass matrices based on a flavor- and generation-dependent string-motivated U(1)$_A$ gauge symmetry and report two new classes of solutions to the requisite consistency conditions. In particular, we propose that the fundamental reason underlying the striking feature $m_b, \ m_\tau << m_t$ is t...
1994-12-23
2009-10-28
[ "hep-ph" ]
Vidyut Jain and Robert Shrock
hep-ph/9412352
Open Charm Production in an Equilibrating Parton Plasma
Open charm production during the equilibration of a gluon dominated parton plasma is calculated, with both the time-dependent temperature and parton densities given by a set of rate equations. Including pre-thermal production, the total enhancement of open charm production over the initial gluon fusion depends sensitiv...
1994-12-22
2008-11-26
[ "hep-ph", "nucl-th" ]
Peter Levai, Berndt Muller, and Xin-Nian Wang
hep-ph/9412359
Boson Interferometry after SPS and before RHIC
We re--examine the connection between interferometry and the Wigner representation for source freeze--out, and continuous emission. At the operator level, two equivalent representations of the two--particle spectrum are found, which contradict the standard expression of kinetic theory. The discrepancy is resolved using...
1994-12-22
2009-09-25
[ "hep-ph", "nucl-th" ]
A. Makhlin, E. Surdutovich, G. Welke
hep-ph/9412364
Study of Chiral Invariance Using Pions
We review two manifestations of chiral symmetry breaking in the pion sector. First, we examine the $\pi\pi$ scattering amplitude at threshold, which is completely determined by the chiral symmetry breaking part of the strong interaction, and, thus, directly constrains the form of the low energy effective lagrangians. W...
1994-12-22
2007-05-23
[ "hep-ph" ]
Dinko Pocanic (University of Virginia)
hep-ph/9412362
Quantum Field Kinetics
Using the general framework of quantum field theory, we derive basic equations of quantum field kinetics. The main goal of this approach is to compute the observables associated with a quark-gluon plasma at different stages of its evolution. We start by rewriting the integral equations for the field correlators in diff...
1994-12-22
2009-09-25
[ "hep-ph" ]
A.Makhlin
hep-ph/9412361
Tests of the Standard Model and Searches for New Physics
The implications of precision $Z$ and $W$-pole and neutral current data for testing the standard electroweak model, determining its parameters, and searching for new physics, are described.
1994-12-22
2016-11-03
[ "hep-ph" ]
Paul Langacker
hep-ph/9412353
$1/N_c$ Rotational Corrections to $g_A$ in the NJL Model and Charge Conjugation
We show that the $1/N_c$ rotational corrections to $g_A$, derived using the semiclassical quantization scheme in the NJL model, possess correct properties under charge conjugation.
1994-12-22
2008-11-26
[ "hep-ph" ]
Chr.V.Christov, K.Goeke and P.V.Pobylitsa
hep-ph/9412357
Schwinger Particle-Production Mechanism for a Finite-Length Flux Tube with Transverse Confinement
Previous results for the pair production probability in a strong electric field with a finite longitudinal separation are generalized to the case of a finite-length flux tube with transverse confinement. The threshold length of the flux tube, below which pair production cannot occur, increases as a result of transverse...
1994-12-22
2009-10-28
[ "hep-ph" ]
Cheuk-Yin Wong, Ren-Chuan Wang, and Jian-Shi Wu
hep-ph/9412354
Baryon Chiral Perturbation Theory up to Next-to-Leading Order
We examine the general lagrangian for baryon chiral perturbation theory with SU(3) flavor symmetry, up to the next-to-leading order. We consider both the strong and the weak interaction. The inverse of the baryon mass is treated as an additional small expansion parameter, and heavy fermion effective field theory techni...
1994-12-22
2009-10-28
[ "hep-ph" ]
J.W. Bos, D.W. Chang, S.C. Lee, Y.C. Lin, and H.H. Shih
hep-ph/9412342
Triply Differential Jet Cross Sections for Hadron Collisions at Order alpha_s^3 in QCD
We discuss cross sections for hadron + hadron to 2 jets + anything in which three jet variables are measured. Such cross sections are useful especially for determining parton distributions. We define a new cross section d sigma/dX_A dX_B d eta_* for which the perturbation theory is nicely behaved even in the kinematic ...
1994-12-22
2009-10-28
[ "hep-ph" ]
Stephen D. Ellis and Davison E. Soper
hep-ph/9412355
Weak Decays of Heavy Mesons in the Instantaneous Bethe Salpeter Approach
In the framework of the instantaneous Bethe Salpeter equation we investigate weak decays of B and D mesons. Mesons are described as q-bar q states interacting via a mixture of a scalar and a vector confining kernel and a one gluon exchange. The model parameters are fixed by a fit to the meson mass spectrum including al...
1994-12-22
2010-11-01
[ "hep-ph" ]
G. Zoeller, S. Hainzl, C.R. Muenz (ITKP, Uni Bonn) M. Beyer (MPG-AG, Uni Rostock)
hep-ph/9412360
Hydrodynamics near the QCD Phase Transition: Looking for the Longest-Lived Fireball
We propose a new strategy for the experimental search of the QCD phase transition in heavy ion collisions: One may tune collision energy around the point where the lifetime of the fireball is expected to be longest. We demonstrate that the hydrodynamic evolution of excited nuclear matter does change dramatically as the...
1994-12-22
2009-10-28
[ "hep-ph", "nucl-ex", "nucl-th" ]
C.M.Hung and E.V.Shuryak (SUNY at Stony Brook)
hep-ph/9412356
Two-loop three-point diagrams with irreducible numerators
We study the problem of calculating two-loop three-point diagrams with irreducible numerators (i.e. numerators which cannot be expressed in terms of the denominators). For the case of massless internal particles and arbitrary (off-shell) external momenta, exact results are obtained in terms of polylogarithms. We also c...
1994-12-22
2014-11-17
[ "hep-ph", "hep-th" ]
Natalia I. Ussyukina and Andrei I. Davydychev
hep-ph/9412358
The Worldline Path Integral Approach to Feynman Graphs
The worldline path integral approach to the Bern-Kosower formalism is reviewed, which offers an alternative to Feynman diagram calculations in quantum field theory. Recent progress in constructing a multiloop generalization of this formalism is reported.
1994-12-22
2008-02-03
[ "hep-ph", "hep-th" ]
M.G. Schmidt and C. Schubert
hep-ph/9412363
Quark and gluon distributions at the earliest stage of heavy ion collision
Using the general framework of quantum field kinetics we consider new principles to compute initial distribution of quarks and gluons after the first hard interaction of heavy ions. We start by rewriting the integral equations of QCD in the form which is generalizations of the familiar QCD evolution equations. These eq...
1994-12-22
2010-03-25
[ "hep-ph" ]
A.Makhlin
hep-ph/9412343
On the large-$N_c$ behavior of the $L_7$ coupling in $\chi$PT
It is shown that the usual large-$N_c$ counting of the coupling constant $L_{7}$ of the ${\cal O}(p^4)$ low-energy chiral $SU(3)$ Lagrangian \cite{GL85} is in conflict with general properties of QCD in the large-$N_c$ limit. The solution of this conflict within the framework of a chiral $U(3)$ Lagrangian is explained.
1994-12-21
2009-10-28
[ "hep-ph" ]
Santiago Peris and Eduardo de Rafael
hep-ph/9412349
Correction Factors for Reactions involving Quark-Antiquark Annihilation or Production
In reactions with $q \bar q$ production or $q\bar q$ annihilation, initial- and final-state interactions give rise to large corrections to the lowest-order cross sections. We evaluate the correction factor first for low relative kinetic energies by studying the distortion of the relative wave function. We then follow t...
1994-12-21
2009-09-25
[ "hep-ph" ]
Lali Chatterjee and Cheuk-Yin Wong
hep-ph/9412351
Heavy Baryons: Current, Pion and Photon Transtions
We discuss the structure of current-induced bottom baryon to charm baryon transitions, and the structure of pion and photon transitions between heavy charm or bottom baryons in the Heavy Quark Symmetry limit as ${\scriptstyle m_Q\rightarrow \infty}$. Our discussion involves the ground state $s$-wave heavy baryons as we...
1994-12-21
2009-09-25
[ "hep-ph" ]
J.G. Koerner, J. Landgraf
hep-ph/9412350
Use of Recursion Relations to Compute One-Loop Helicity Amplitudes
We illustrate the use of recursion relations in the computation of certain one-loop helicity amplitudes containing an arbitrary number of gauge bosons. After a brief review of the recursion relations themselves, we discuss the resolution of the apparent conflict between the spinor helicity method used to solve the recu...
1994-12-21
2007-05-23
[ "hep-ph" ]
Gregory Mahlon
hep-ph/9412347
The effect of the vertical part of the path on the real time Feynman rules in finite temperature field theory
The effect of the contribution of the vertical part of the real time path is studied completely in the case of two points functions. Indeed, this vertical part generally contributes in the calculation of a given graph. Moreover, this contribution is essential in order to have a consistent equilibrium theory: thanks to ...
1994-12-21
2007-05-23
[ "hep-ph" ]
Fran\c{c}ois Gelis
hep-ph/9412345
Renormalons at Low x
The role of infrared and ultraviolet renormalons are discussed in context of leading log(1/x) approximation of perturbative QCD. We generalize the BFKL equation for the case of running coupling QCD constant and show that the uncertainties related to the contribution of infrared renormalons turn out to be smaller than t...
1994-12-21
2009-10-28
[ "hep-ph" ]
Eugene Levin
hep-ph/9412346
Supersymmetry dileptons and trileptons at the Tevatron
We consider the production of supersymmetry neutralinos and charginos in $p\bar p$ collisions at the Tevatron, and their subsequent decay via hadronically quiet dileptons and trileptons. We perform our computations in the context of a variety of supergravity models, including generic four-parameter supergravity models,...
1994-12-21
2009-09-25
[ "hep-ph" ]
J. Lopez, D. Nanopoulos, X. Wang, and A. Zichichi
hep-ph/9412340
Applicability of Perturbative QCD to $B\to D$ Decays
We examine the applicability of perturbative QCD to $B$ meson decays into $D$ mesons. We find that the perturbative QCD formalism, which includes Sudakov effects at intermediate energy scales, is applicable to the semi-leptonic decay $B\to D l\nu$, when the $D$ meson recoils fast. Following this conclusion, we analyze ...
1994-12-21
2010-11-01
[ "hep-ph" ]
Hsiang-nan Li
hep-ph/9412348
Total Cross Sections for Heavy Flavour Production at HERA
We compute total cross sections for charm and bottom photoproduction at HERA energies, and discuss the relevant theoretical uncertainties. In particular we discuss the problems arising from the small-$x$ region, the uncertainties in the gluon parton density, and the uncertainties in the hadronic component of the cross ...
1994-12-21
2008-11-26
[ "hep-ph" ]
S. Frixione, M. L. Mangano, P. Nason and G. Ridolfi
hep-ph/9412341
Numerical Solution of Altarelli-Parisi Equations
We discuss numerical solution of Altarelli-Parisi equations in a Laguerre-polynomial method and in a brute-force method. In the Laguerre method, we get good accuracy by taking about twenty Laguerre polynomials in the flavor-nonsinglet case. Excellent evolution results are obtained in the singlet case by taking only ten...
1994-12-21
2010-03-25
[ "hep-ph", "nucl-th" ]
R. Kobayashi, M. Konuma, S. Kumano, and M. Miyama
hep-ph/9412344
Quantum coherence in heavy-flavor production on nuclei
We describe a light-cone wave function formalism for hadroproduction of heavy-flavors via gluon-gluon fusion. The developed approach is well suited to address coherence effects in heavy-quark production on nuclei at small $x_{2} \lsim 0.1\cdot A^{-1/3}$. Nuclear attenuation in hadroproduction of heavy-flavors is found ...
1994-12-21
2010-11-01
[ "hep-ph" ]
N.N.Nikolaev, G.Piller and B.G.Zakharov
hep-ph/9412323
Rapidity-Dependent Low-pt Enhancement
The rapidity dependence of the low-$p_t$ enhancement is shown to be a sensitive measure of the longitudinal source size for longitudinally expanding finite systems.
1994-12-20
2007-05-23
[ "hep-ph", "nucl-th" ]
T. Csorgo
hep-ph/9412329
Like-sign dilepton signature for gluino production at LHC including top quark and higgs boson effects
A systematic analysis of the like-sign dipleton signature for gluino production at LHC is performed in the $R$-conserving minimal supersymmetric standard model, taking into account the top quark and Higgs boson effects in the cascade decay. We consider two representative values of the gluino mass, 300 and 800 GeV, alon...
1994-12-20
2009-09-25
[ "hep-ph" ]
Manoranjan Guchait and D.P. Roy
hep-ph/9412338
The Inclusive Two Jet Triply Differential Cross Section
We study the inclusive two jet triply differential cross section $d^3\sigma/dE_Td\eta_1d\eta_2$ at Fermilab energies. Different $\eta_1$ and $\eta_2$ pseudorapidity regions are directly related to both the parton level matrix elements and the parton densities at leading order. We present the next-to-leading order [${\c...
1994-12-20
2008-11-26
[ "hep-ph" ]
W.T. Giele, E.W.N. Glover and David A. Kosower
hep-ph/9412336
On dynamics of pseudorapidity fluctuations in central C--Cu collisions at 4.5~A GeV/c
Results on dynamical fluctuations of charged particles in the pseudorapidity space of central C--Cu interactions at 4.5 $A$ GeV/$c$ are performed in the transformed variables and using higher order scaled factorial moments modifyied to remove the bias of infinite statistics in the normalization. The intermittency behav...
1994-12-20
2009-10-28
[ "hep-ph" ]
E.K.Sarkisyan, L.K.Gelovani, G.L.Gogiberidze (Inst. of Phys., Tbilisi, Georgia), G.G. Taran (Lebedev Inst., Moskow, Russia)
hep-ph/9412331
Adiabatic matter effect with three generation neutrinos and the solar neutrino problem
We find an exact analytic solution for the time evolution of a three Dirac neutrino system adiabatically oscillating in matter, constructing explicitly the relevant $3\times 3$ mixing matrix in matter. Using this result we investigate the solar neutrino data in a scenario where the neutrino masses are such that $m_1\al...
1994-12-20
2009-09-25
[ "hep-ph" ]
M. M. Guzzo, O. L. G. Peres, V. Pleitez and R. Zukanovich Funchal
hep-ph/9412322
Naturalness and superpartner masses or when to give up on weak scale supersymmetry
Superpartner masses cannot be arbitrarily heavy if supersymmetric extensions of the standard model explain the stability of the gauge hierarchy. This ancient and hallowed motivation for weak scale supersymmetry is often quoted, yet no reliable determination of this upper limit on superpartner masses exists. In this pap...
1994-12-20
2008-11-26
[ "hep-ph" ]
Greg Anderson and Diego Castano (MIT)
hep-ph/9412335
Nonperturbative Corrections to the Dilepton Cross Section
We study the sensitivity of the dilepton production cross section to higher twist terms. A method for calculating the resummed cross section is introduced in moment space, where the leading higher twist terms can be easily parametrized and calculated. We find that a $1/Q$ power correction may significantly affect the c...
1994-12-20
2009-09-25
[ "hep-ph" ]
Lyndon Alvero (ITP, SUNY at Stony Brook)
hep-ph/9412328
Deconfinement of Constituent Quarks and the Hagedorn Temperature
The double phase transition of hadronic matter, $H$, first, to the gas of deconfined constituent quarks (for brevity called {\it valons}), $Q$, and then, secondly, the phase transition from $Q$ to quark-gluon plasma, $QGP$, is considered within bag model ideology. In distinction from previous double phase transition in...
1994-12-20
2009-09-25
[ "hep-ph" ]
O.D. Chernavskaya, E.L. Feinberg (P.N.Lebedev Physical Institute, Russia)
hep-ph/9412330
Baryogenesis and damping in nonminimal electroweak models
We study the effect of damping on the generation of baryon asymmetry of the Universe in the standard model of the eletroweak theory with simple extensions of the Higgs sector. The propagation of quarks of masses up to about 5 GeV are considered, taking into account their markedly different dispersion relations due to i...
1994-12-20
2007-05-23
[ "hep-ph" ]
A. Kundu and S. Mallik
hep-ph/9412325
The Two Loop Long Range Effect on the Proton Decay Effective Lagrangian
We calculate the two loop long range effect on the proton decay effective Lagrangian. Numerical calculation for suppression factor gives $ A_L($2-loop$) = 0.321$ for the value of the strong coupling constant $ \alpha_s(m_Z) = 0.116 $. Two loop effect to more general effective Lagrangian is also given.
1994-12-20
2017-02-01
[ "hep-ph" ]
Takeshi Nihei and Jiro Arafune
hep-ph/9412334
Abundant phi-Meson Production in pbar-p Annihilation at Rest and Strangeness in the Nucleon
A large apparent violation of the OZI rule has recently been found in many channels in pbar-p annihilation LEAR. An interpretation of these data in terms of the "shake-out" and "rearrangement" of an intrinsic sbar-s component of the nucleon wave function is proposed. This gives a channel-dependent, non-universal modifi...
1994-12-20
2009-09-11
[ "hep-ph" ]
J. Ellis, M. Karliner, D.E. Kharzeev and M.G. Sapozhnikov
hep-ph/9412332
String no-scale supergravity
We explore the postulates of string no-scale supergravity in the context of free-fermionic string models. The requirements of vanishing vacuum energy, flat directions of the scalar potential, and stable no-scale mechanism impose strong restrictions on possible string no-scale models, which must possess only two or thre...
1994-12-20
2009-10-28
[ "hep-ph", "hep-th" ]
J. Lopez and D. Nanopoulos
hep-ph/9412327
QCD coherence in the structure function and associated distributions at small $x$
We recall the origin of angular ordering of soft parton emission in the region of small $x$ and show that this coherent structure can be detected in associated distributions. For structure functions at small $x$ and at fixed transverse momentum the angular ordering is masked because of the complete inclusive cancellati...
1994-12-20
2009-10-28
[ "hep-ph" ]
Giuseppe Marchesini
hep-ph/9412339
Summary of $\pi$--$\pi$ Scattering Experiments
Present status of the study of the low energy $\pi\pi$ interaction is reviewed, including the recent results on reactions $\pi N \to\pi\pi N$ near threshold. Current experimental values of s-wave $\pi\pi$ scattering lengths are compared with predictions of various theoretical models. Required experimental and theoretic...
1994-12-20
2009-10-28
[ "hep-ph" ]
Dinko Pocanic (University of Virginia)
hep-ph/9412326
Strong Interactions at Low Energy
This is a revised version of a talk given at the Chiral Dynamics Workshop at M.I.T., July 25, 1994. It reports results in three areas: (1) The isospin-violating interactions between one non-relativistic nucleon and any number of soft pions can be summarized in a single term in the effective chiral Lagrangian, with no u...
1994-12-20
2009-10-28
[ "hep-ph" ]
Steven Weinberg
hep-ph/9412333
Test of universality hypothesis for scalar potential between quarks
The universality hypothesis for scalar confining potential between quark and antiquark with different flavours is confirmed within 0.05 level of relativity errors.
1994-12-20
2019-08-17
[ "hep-ph" ]
S.V.Semenov, V.V.Khruschev
hep-ph/9412337
HQQET: An Effective Theory Approach to Heavy Quarkonia Decays
We discuss systems containing a heavy quark and a heavy antiquark in the infinite mass limit of QCD. Studying the limit of equal velocities for both heavy particles, we formulate an effective theory approach to heavy quarkonia-like systems. The method is well suited to processes in which the two heavy quarks annihilate...
1994-12-20
2009-10-28
[ "hep-ph" ]
Thomas Mannel and Gerhard Schuler
hep-ph/9412321
On the interaction of spin 3/2 particles
Lagrangian of a massive particle with spin 3/2 is considered in the Rarita-Schwinger formalism. We discuss implications of the contact- and the gauge-transformation on the physical content of free and interacting theories. It is shown that the ``contact-invariance'' is trivial and has no physical relevance. The require...
1994-12-19
2016-09-01
[ "hep-ph" ]
V. Pascalutsa
hep-ph/9412317
The electroweak chiral Lagrangian as an effective field theory of the standard model with a heavy Higgs
Using effective field theory methods, we integrate out the standard model Higgs boson to one loop and represent its non-decoupling effects by a set of gauge invariant effective operators of the electroweak chiral Lagrangian. We briefly discuss the relation between the renormalization of both the standard model and the ...
1994-12-19
2007-05-23
[ "hep-ph" ]
M.J. Herrero and E. Ruiz Morales
hep-ph/9412320
Absence of Species Doubling in Finite-Element Quantum Electrodynamics
In this letter it will be demonstrated explicitly that the finite-element formulation of quantum electrodynamics is free from fermion doubling. We do this by (1) examining the lattice fermion propagator and using it to compute the one-loop vacuum polarization on the lattice, and (2) by an explict computation of vector ...
1994-12-19
2009-10-28
[ "hep-ph", "hep-lat" ]
Kimball A. Milton
hep-ph/9412315
Equivalence of Light-Front and Covariant Field Theory
In this paper we discuss the relation between the standard covariant quantum field theory and light-front field theory. We define covariant theory by its Feynman diagrams, whereas light-front field theory is defined in terms of light-cone time-ordered diagrams. A general algorithm is proposed that produces the latter f...
1994-12-19
2009-10-28
[ "hep-ph", "nucl-th" ]
N.E. Ligterink and B.L.G. Bakker (Vrije Universiteit, Amsterdam, The Netherlands)
hep-ph/9412314
QCD_{1+1} at large N_F and N_C
QCD in 1+1 dimensions is examined in the limit of a large number of colors and flavors. The Hamiltonian matrix is given in a Fock space spanned by 't Hooft meson states and, for the case of zero fermion mass, a submatrix is diagonalized numerically to give the low-lying spectrum as a function of $N_F /N_C $. Pair creat...
1994-12-19
2010-11-01
[ "hep-ph" ]
Michael Engelhardt
hep-ph/9412318
Baryon masses from QCD current correlators at $T\neq 0$
Correlation functions of QCD currents with quantum numbers of nucleon and $\Delta$-isobar are considered at finite temperatures. Corrections of order $T^4$ to the correlators are calculated and interpreted in terms of thermal mass shifts using a QCD sum rules type of argument. In both cases the masses decrease with $T$...
1994-12-19
2009-10-28
[ "hep-ph" ]
V.L. Eletsky
hep-ph/9412324
Constraints on Form Factors For Exclusive Semileptonic Heavy to Light Meson Decays
We use rigorous QCD dispersion relations to derive model-independent bounds on the B -> pi l nu, D -> pi l nu and D -> K l nu form factors. These bounds are particularly restrictive when the value of the observable form factor at one or more kinematic points is assumed. With reasonable assumptions we find f_B < 195 MeV...
1994-12-19
2010-11-01
[ "hep-ph" ]
C. Glenn Boyd, Benjamin Grinstein and Richard F. Lebed
hep-ph/9412319
Universality of the Pinch Technique Gauge Boson Self-Energies
It is shown how the S-matrix pinch technique may be extended to the cases of external scalar and gauge boson fields. Using this extension, the universality of the pinch technique gauge-independent one-loop gauge boson self-energy in a general unbroken SU($N$) gauge theory is demonstrated explicitly.
1994-12-19
2016-09-01
[ "hep-ph" ]
Jay Watson
hep-ph/9412316
Physics of Strangelets
After a brief introduction to the physics of bulk strange quark matter (SQM) this review focuses on the properties of low baryon number strangelets presently searched for in ultra-relativistic heavy-ion experiments at CERN and Brookhaven. Shell-model calculations reveal interesting (meta)stability properties in the exp...
1994-12-19
2007-05-23
[ "hep-ph", "nucl-th" ]
Jes Madsen (Institute of Physics and Astronomy, Univ. of Aarhus)
hep-ph/9412313
Spin effects in strong interactions at high energy
Spin effects in strong interaction high energy processes are subtle phenomena which involve both short and long distance physics and test perturbative and non perturbative aspects of QCD. Moreover, depending on quantities like interferences between different amplitudes and relative phases, spin observables always test ...
1994-12-17
2008-11-26
[ "hep-ph" ]
Mauro Anselmino
hep-ph/9412310
Q^2-Evolution of Nucleon's Chiral-Odd Twist-3 Structure Function: h_L(x,Q^2)
We investigate the $Q^{2}$-evolution of the chiral-odd spin-dependent parton distribution $h_{L}(x, Q^{2})$ relevant for the polarized Drell-Yan processes. The results are obtained in the leading logarithmic order in the framework of the renormalization group and the standard QCD perturbation theory. We calculate the a...
1994-12-16
2009-09-25
[ "hep-ph" ]
Y. Koike and K. Tanaka
hep-ph/9412311
Two-loop ${\rm O}\left(G_F^2M_H^4\right)$ corrections to the fermionic decay rates of the Higgs boson
We calculate the dominant ${\rm O}\left(G_F^2M_H^4\right)$ two-loop electroweak corrections to the fermi\-onic decay widths of a heavy Higgs boson in the Standard Model. Use of the Goldstone-boson equivalence theorem reduces the problem to one involving only the physical Higgs boson $H$ and the Goldstone bosons $w^\pm$...
1994-12-16
2011-01-27
[ "hep-ph" ]
Loyal Durand, Bernd A. Kniehl, and Kurt Riesselmann
hep-ph/9412312
Suppression of dilepton production in hot hadronic matter
The pion electromagnetic form factor at finite temperature is studied using an effective chiral lagrangian that includes explicitly vector mesons. We find that in the time-like region around the rho meson resonance it decreases with increasing temperature and leads to a suppression of dilepton production from pion-pion...
1994-12-16
2009-09-25
[ "hep-ph" ]
Chungsik Song, Su Houng Lee, and Che Ming Ko
hep-ph/9412303
Coherent Bremsstrahlung Emission in the Early Stage of Relativistic Heavy Ion Collisions
We present a model of coherent Bremsstrahlung emission from the compression phase of relativistic heavy ion collisions based on a hydrodynamical description of the collision process. The decceleration of the matter through a shock front, calculated in 1-D relativistic dissipative hydrodynamics, is at the origin of a co...
1994-12-15
2007-05-23
[ "hep-ph" ]
C. Bertulani, L. Mornas, U. Ornik
hep-ph/9412308
A Test of the Standard Model, Using Da$\Phi$ne
Both the light hypernucleus ${}_\Lambda {\rm H}^4$ and the nucleus ${\rm He}^4$ have spin 0. The ratio $R$ of the electron to muon rates for the pure Fermi transitions \begin{equation} R=\frac{\Gamma\left({}_\Lambda {\rm H}^4\rightarrow {\rm e}^- + \bar \nu +{\rm He}^4\right)} {\Gamma\left({}_\Lambda {\rm H}^4\rightarr...
1994-12-15
2007-05-23
[ "hep-ph" ]
M. Block (Northwestern Univ.)
hep-ph/9412307
The b->s +\gamma Decay in Supergravity
The $b\rightarrow s+ \gamma$ decay is a powerful tool for testing models of new physics because the new physics diagrams enter in the same loop order as the Standard Model ones. The current experimental and theoretical status of this decay is reviewed. Predictions based on the minimal supergravity model (MSGM) in the l...
1994-12-15
2007-05-23
[ "hep-ph" ]
R. Arnowitt and Pran Nath
hep-ph/9412305
The renormalization group inspired approaches and estimates of the tenth-order corrections to the muon anomaly in QED
We present the estimates of the five-loop QED corrections to the muon anomaly using the scheme-invariant approaches and demonstrate that they are in good agreement with the results of exact calculations of the corresponding tenth-order diagrams supplemented by the additional guess about the values of the non-calculated...
1994-12-15
2016-08-24
[ "hep-ph" ]
Andrei L. Kataev and Valery V. Starshenko
hep-ph/9412306
The High Energy Behavior of the Forward Scattering Parameters \sigma total $\rho$, and $B$
Utilizing the most recent experimental data, we reanalyze high energy \pbar p and pp data, using two distinct (and {\em dissimilar}) analysis techniques: (1) asymptotic amplitude analysis, under the assumption that we have reached `asymptopia', and (2) an eikonal model whose amplitudes are designed to mimic real QCD am...
1994-12-15
2007-05-23
[ "hep-ph" ]
M.M. Block (Northwest), F. Halzen (Madison), B. Margolis (Mc Gill) and A.R. White (Argonne)
hep-ph/9412301
The Photoproduction of Hybrid Mesons from Cebaf to HERA
Decay widths, branching ratios and production dynamics of some recently discovered $J^{PC} = 1^{-+}, 0^{-+}$,$1^{--}$ and $2^{-+}$ mesons are found to be in remarkable agreement with the predicted properties of hybrid mesons. We propose tests for this new dynamics, emphasise the critical role of $\pi b_1$ or $\pi h_1$ ...
1994-12-15
2009-10-28
[ "hep-ph" ]
F.E.Close and P.R.Page
hep-ph/9412302
Heavy-Quark Symmetry and Skyrmions
We review recent development on combining heavy-quark symmetry and chiral symmetry in the skyrmion structure of the baryons containing one or more heavy quarks, c (charmed) and b (bottom). We describe two approaches: One going from the chiral symmetry regime of light quarks to the heavy-quark symmetry regime which will...
1994-12-15
2010-11-01
[ "hep-ph", "nucl-th" ]
Dong-Pil Min, Yongseok Oh, Byung-Yoon Park, Mannque Rho