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hep-ph/9404270
Measurement of the Spin-Dependent Structure Function $g_1(x)$ of the Proton
We have measured the spin-dependent structure function $g_1^p$ of the proton in deep inelastic scattering of polarized muons off polarized protons, in the kinematic range $0.003<x<0.7$ and $1\,\mbox{GeV}^2<Q^2<60\,\mbox{GeV}^2$. Its first moment, $\int_0^1 g_1^p(x) dx $, is found to be $0.136 \pm 0.011\,(\mbox{stat.})\...
1994-04-15
2010-01-15
[ "hep-ph", "hep-ex" ]
the SMC
hep-ph/9404271
Origin and Mechanisms of CP Violation
It is shown that the mechanism of spontaneous symmetry breaking provides not only a mechanism for giving mass to the bosons and the fermions, but also a mechanism for generating CP-phase of the bosons and the fermions. A two-Higgs doublet model with Vacuum CP Violation and Approximate Global $U(1)$ Family Symmetries (A...
1994-04-15
2008-02-03
[ "hep-ph" ]
Yue-Liang Wu
hep-ph/9404269
The Threshold Pion-Photoproduction of Nucleons In The Chiral Quark Model
In this paper, we show that the low energy theorem (LET) of the threshold pion-photoproduction can be fully recovered in the quark model. An essential result of this investigation is that the quark-pion operators are obtained from the effective chiral Lagrangian, and the low energy theorem does not require the constrai...
1994-04-14
2009-10-28
[ "hep-ph", "nucl-th" ]
Zhenping Li
hep-ph/9404268
Vacuum stability in the singlet Majoron model
We study the vacuum stability of the singlet Majoron model using full renormalization group improved scalar potential and Monte Carlo techniques. We show that in the perturbative regime of the various free parameters, the vacuum stability requirement together with LEP limits is passed by 18% of the parameter space if t...
1994-04-14
2009-10-28
[ "hep-ph" ]
J. Sirkka and I. Vilja
hep-ph/9404265
Possible Extension of the Chiral Perturbation Theory Program
After a brief discussion of how chiral dynamics has evolved from the ``universal V-A theory of weak interactions'', we present some evidence that symmetry breaking for the vector meson multiplet is not simpler than but rather analogous to that for the pseudoscalar multiplet. This provides a motivation for speculating o...
1994-04-13
2016-11-03
[ "hep-ph" ]
J. Schechter
hep-ph/9404263
Implications of a Heavy Top in Supersymmetric Theories
In the context of the radiative electroweak symmetry breaking scenario, we investigate the implications of a heavy top quark mass, close to its infrared fixed point, on the low energy parameters of the minimal supersymmetric standard model. We use analytic expressions to calculate the Higgs masses as well as the supers...
1994-04-13
2011-07-19
[ "hep-ph" ]
G.K. Leontaris and N.D. Tracas
hep-ph/9404261
CKM Matrix from Leptoquark-Quark Mixing in a String Model
We investigate a scenario in which the CKM matrix arises from leptoquark--down quark mixing in a particular standard--like superstring model. We find that for some choices of F and D flat directions realistic quark mixing can be obtained without any phenomenological problems. This scenario predicts a symmetric (in abso...
1994-04-13
2010-11-01
[ "hep-ph" ]
Edi Halyo
hep-ph/9404260
On collinearization of quarks in the quark-gluon decays of heavy orthoquarkonia
The decay of heavy orthoquarkonium into quark-antiquark pair and two gluons is considered. The differential probability of the decay in the tree approximation is calculated and the probability distributions of quarks and gluons are obtained. The collinear enhancement of the bottomonium decay is shown to take place at t...
1994-04-13
2015-06-25
[ "hep-ph" ]
A.Ya.Parkhomenko and A.D.Smirnov
hep-ph/9404264
Breaking Electroweak Symmetry Strongly
The problem of electroweak symmetry breaking is reviewed with discussion of future relevant experimentation at LHC and $e^+e^-$ linear colliders. The possibility of strong electroweak symmetry breaking is examined in more detail, using the BESS (Breaking Electroweak Symmetry Strongly) model as a basis for the discussio...
1994-04-13
2016-11-03
[ "hep-ph" ]
N.Di Bartolomeo and R.Gatto
hep-ph/9404262
What is being calculated with Thermal Field Theory?
Thermal field theory is reviewed briefly. It is noted that, until recently, it was not known what type of real-time Green function is being calculated in the Euclidean approach. The formal answer to this question is then given and the unexpectedly complicated answer is discussed. The physical implications of the result...
1994-04-13
2011-08-01
[ "hep-ph" ]
T.S. Evans
hep-ph/9404267
From Multiloop Spinor Helicity Technique to String Reorganization
The success of the spinor helicity technique for tree processes is reviewed. To apply it to multiloop diagrams one is naturally led to the Schwinger proper-time representation, whose properties are discussed. This representation also serves as a useful link between field theories and string theories.
1994-04-13
2009-09-25
[ "hep-ph", "hep-th" ]
C.S. Lam
hep-ph/9404266
SUSY Magnetic Moments Sum Rules and Supersymmetry Breaking
It was recently shown that unbroken N=1 Susy relates, in a model independent way, the magnetic transitions between states of different spin within a given charged massive supermultiplet. We verify explicitly these sum rules for a vector multiplet in the case of massless and massive fermions. The purpose of this analysi...
1994-04-13
2009-10-28
[ "hep-ph" ]
A. Culatti
hep-ph/9404256
Summary Talk at the 3rd KEK Topical Conference on CP Violation
A summary of the contributions to this topical conference is presented. The topics discussed ranged from detailing what we know about CP violation, to what we hope to learn in the future, to still unsolved mysteries in the subject.
1994-04-12
2015-06-25
[ "hep-ph" ]
R. D. Peccei
hep-ph/9404257
Can the Supersymmetric $\mu$ parameter be generated dynamically without a light Singlet?
It is generally assumed that the dynamical generation of the Higgs mass parameter of the superpotential, $\mu$, implies the existence of a light singlet at or below the supersymmetry breaking scale, $\msusy$. We present a counter-example in which the singlet field can receive an arbitrarily heavy mass (\eg, of the orde...
1994-04-12
2009-10-28
[ "hep-ph" ]
Ralf Hempfling
hep-ph/9404259
$W^+-H^+$ Interference and Partial Width Asymmetry in Top and Antitop Decays
We re-examine the question of a possible difference in the partial decay widths of $t$ and $\overline t$, induced by an intermediate scalar boson $H^+$ with $CP$-violating couplings. The interference of $W^+$ and $H^+$ exchanges is analysed by constructing the $2\times 2$ propagator matrix of the $W^+-H^+$ system, and ...
1994-04-12
2010-11-01
[ "hep-ph" ]
T. Arens and L.M. Sehgal
hep-ph/9404258
The forward-backward asymmetry with $Z'$ effects in the process $e^{+}$ $e^{-}$ $\rightarrow$ $\mu^{+}$ $\mu^{-}$
Having taken the QED radiative correction and one-loop weak corrections into account, we have computed the unpolarized forward-backward asymmetry in the process $e^+e^- -> \mu^+\mu^-$ at a very reasonable accuracy. Special attention to the effects around the LEP 200 energy, induced by the possible $Z'$ boson of the lef...
1994-04-12
2009-10-28
[ "hep-ph" ]
Ma Wen-Gan, Sun La-Zhen, Liu Yao-Yang, Jiang Yi and Chao-Hsi Chang
hep-ph/9404254
Fragmentation Function Method for Charge Asymmetry Measurements in $\e^+e^-$ Collisions
We propose a method for measuring the hadron charge asymmetry in $\ee$ collisions which is based upon the fragmentation function formalism, and is largely independent of modelling of fragmentation effects. Furthermore, in this method, QCD radiative corrections can be accounted for in a systematic way.
1994-04-11
2009-10-28
[ "hep-ph" ]
P. Nason and B.W. Webber
hep-ph/9404251
Curvature energy effects on strange quark matter nucleation at finite density
We consider the effects of the curvature energy term on thermal strange quark matter nucleation in dense neutron matter. Lower bounds on the temperature at which this process can take place are given and compared to those without the curvature term.
1994-04-11
2009-10-28
[ "hep-ph", "astro-ph" ]
J.E.Horvath
hep-ph/9404253
Predictions for Constrained Minimal Supersymmetry with Bottom-Tau Mass Unification
We examine the Constrained Minimal Supersymmetric Standard Model (CMSSM) with an additional requirement of strict b - tau unification in the region of small tan(beta). We find that the parameter space becomes completely limited below about 1 TeV by physical constraints alone, without a fine-tuning constraint. We study ...
1994-04-11
2011-01-27
[ "hep-ph" ]
Chris Kolda, Leszek Roszkowski, James D. Wells, and G.L. Kane
hep-ph/9404248
Ultraviolet-Renormalon Reexamined
We consider large-order perturbative expansions in QED and QCD. The coefficients of the expansions are known to be dominated by the so called ultraviolet (UV) renormalons which arise from inserting a chain of vacuum-polarization graphs into photonic (gluonic) lines. In large orders the contribution is associated with v...
1994-04-11
2019-08-15
[ "hep-ph", "hep-th" ]
A.I. Vainshtein, V.I. Zakharov
hep-ph/9404255
Vacuum Structure in QCD with Quark and Gluon Condensates
We consider here the vacuum structure in QCD with both quark and gluon condensates and a variational ansatz for the ground state. The method is nonperturbative using only equal time algebra for the field operators. We then find that a constrained energy minimisation of the Hamiltonian leads to a QCD vacuum with both qu...
1994-04-11
2015-06-25
[ "hep-ph", "nucl-th" ]
A. Mishra, H. Mishra, Varun Sheel, S.P. Misra and P.K. Panda
hep-ph/9404249
Residual long-range pseudoscalar forces between unpolarised macroscopic bodies
In this paper we survey the effects of residual long-range forces associated to $\gamma_5$-spin dependent-couplings of fermions to massless bosons exerted by unpolarised bulk matter over macroscopic distances. We establish that such forces with behaviour proportional to $R^{-6}$ do indeed exist. They arise as a quantum...
1994-04-11
2010-11-01
[ "hep-ph" ]
J.A. Grifols and S. Tortosa (IFAE Institut de Fisica d'Altes Energies Grup de Fisica Teorica Universitat Autonoma de Barcelona Bellaterra, Barcelona, Catalonia, Spain)
hep-ph/9404252
The Indirect Detection of Halo Dark Matter
High energy particles are produced by the annihilation of dark matter particles in our galaxy. These are presently searched for using balloon-borne antiproton and positron detectors and large area, deep underground neutrino telescopes. Dark matter particles, trapped inside the sun, are an abundant source of such neutri...
1994-04-11
2016-09-01
[ "hep-ph", "astro-ph" ]
F. Halzen and J.E Jacobsen
hep-ph/9404250
Heavy quark potential and the phase transitions in the continuum theory at finite temperature
Heavy quark potential in the continuum theory at finite temperature is calculated in different phases by using the Polyakov loop as the order parameter. We find the linearly rising potential in the confinement phase, the Debye screened potential in the deconfinement phase and the perturbative $r^{-2}$ dependence at ver...
1994-04-11
2009-10-28
[ "hep-ph", "hep-lat" ]
J. Bohacik and P. Presnajder
hep-ph/9404247
Associated Production of Higgs and Weak Bosons, with H -> b\bar b, at Hadron Colliders
We consider the search for the Higgs boson at a high-luminosity Fermilab Tevatron, an upgraded Tevatron of energy 3.5 TeV, and the CERN Large Hadron Collider, via $WH/ZH$ production followed by H -> bb~ and leptonic decay of the weak vector bosons. We show that each of these colliders can potentially observe the standa...
1994-04-10
2009-10-28
[ "hep-ph" ]
A. Stange, W. Marciano and S. Willenbrock
hep-ph/9404246
`Natural Masslessness Conservation' for neutrinos in two Higgs-doublet models
We present a model which supplements the Standard Electroweak Model with three right-handed neutrinos and one extra scalar doublet which does not develop a vacuum expectation value. With the aid of a discrete symmetry the neutrinos are kept strictly massless. This model has several interesting features. It has unsuppre...
1994-04-10
2011-07-19
[ "hep-ph" ]
A. Barroso and Joao P. Silva
hep-ph/9404244
Standard Model Higgs Physics at a 4 TeV Upgraded Tevatron
We compute an array of Standard Model Higgs boson ($\hsm$) signals and backgrounds for a possible upgrade of the Tevatron to $E_{\rm cm}=4\tev$. Taking $\mt\geq 140\gev$, and assuming a total accumulated luminosity of $L=30\fbi$, we find that a Standard Model Higgs boson with $\mhsm\lsim 110\gev$ could almost certainly...
1994-04-09
2009-10-28
[ "hep-ph" ]
J.F. Gunion and T. Han
hep-ph/9404245
Polarization observables of the $\vec{d} \vec{p} \rightarrow \vec{p}d$ reaction and one-neutron-exchange approximation
The polarization observables in the elastic scattering of polarized deuterons on a polarized hydrogen target, with measurement of the recoil proton polarization, are considered. The observables are calculated in the one-neutron exchange approximation, for the special case of backward scattering ($\theta_{c.m.} = 180^{\...
1994-04-09
2007-05-23
[ "hep-ph" ]
A. P. Kobushkin, A. I. Syamtomov, C. F. Perdrisat, V. Punjabi
hep-ph/9404242
The Rho-Meson as a Collective Excitation
A model of the rho-meson as a collective excitation of $q\bar{q}$ pairs in a system that obeys the modified Nambu--Jona-Lasinio Lagrangian is proposed. The rho emerges as a dormant Goldstone boson. The origin of the rho-meson mass is understood as a result of spontaneous chiral symmetry breaking. The low-energy dynamic...
1994-04-08
2009-10-28
[ "hep-ph", "hep-th" ]
A.A.Osipov (Joint Institute for Nuclear Research, Dubna)
hep-ph/9404237
Multiplicities for LHC Nuclear Collisions Using HERA Structure Functions
We compute in QCD perturbation theory the transverse energy carried by gluons, quarks and antiquarks with $p_T\ge p_0\approx 2$ GeV in Pb+Pb collisions at $\sqrt{s}=5500$ $A$GeV by using structure functions compatible with the small-$x$ increase observed at HERA. This gives a perturbative estimate for the energy and en...
1994-04-08
2009-10-28
[ "hep-ph", "nucl-th" ]
K.J. Eskola, K. Kajantie and P.V. Ruuskanen
hep-ph/9404241
A Model of CP Violation
It is shown that a two-Higgs doublet model with Vacuum CP Violation and Approximate Global $U(1)$ Family Symmetries (AGUFS) may provide one of the simplest and attractive models in understanding origin and mechanisms of CP violation at the weak scale. The whole new interactions of the model are explicitly presented her...
1994-04-08
2008-02-03
[ "hep-ph" ]
Yue-Liang Wu
hep-ph/9404238
Predictions for Proton Lifetime in Minimal Non-Supersymmetric SO(10) Models: An Update
We present our best estimates of the uncertainties due to heavy particle threshold corrections on the unification scale $M_U$, intermediate scale $M_I$ and coupling constant Alpha_U in the minimal non-supersymmetric SO(10) models. Using these , we update the predictions for proton life-time in these models.
1994-04-08
2009-10-28
[ "hep-ph" ]
D.G.Lee, R.N.Mohapatra, M.K.Parida and M.Rani
hep-ph/9404239
The Equivalence Theorem for Chiral Lagrangians
In this work we derive the version of the Equivalence Theorem that applies when the symmetry breaking sector of the Standard Model is described by a general chiral lagrangian. The demonstration is valid for renormalized fields for any value of the gauge parameter (in $R_{\xi}$ gauges) and any parametrization of the cos...
1994-04-08
2019-08-17
[ "hep-ph" ]
A.Dobado, J.R.Pelaez (Departamento de Fisica Teorica, Universidad Complutense de Madrid)
hep-ph/9404236
The Reaction $\pi N \to \pi \pi N$ at Threshold
We consider the chiral expansion for the reaction $\pi N \to \pi \pi N$ in heavy baryon chiral perturbation theory. To order $M_\pi$ we derive novel low--energy theorems that compare favorably with recent determinations of the total cross sections for $\pi^+ p \to \pi^+ \pi^+ n$ and $\pi^- p \to \pi^0 \pi^0 n$.
1994-04-08
2009-10-28
[ "hep-ph", "nucl-th" ]
V. Bernard, N. Kaiser and Ulf-G. Mei{\ss}ner
hep-ph/9404240
Remark on Charm Quark Fragmentation to $D^{**}$ Mesons
The observed $D^{**}$ mesons have $c\bar q$ flavor quantum numbers and spin-parity of the light degrees of freedom $s_\ell^{\pi_{\ell}} = 3/2^+$. In the $m_c \rightarrow \infty$ limit the spin of the charm quark is conserved and the $c \rightarrow D^{**}$ fragmentation process is characterized by the probability for th...
1994-04-08
2009-10-28
[ "hep-ph" ]
Yu-Qi Chen and Mark B. Wise
hep-ph/9404243
Proton Life-Time Problem In Finite Grand Unified Theories
We study proton decay in finite supersymmetric SU(5) grand unified theories. We find that the dimension-five operators due to color triplet higgsino induce too rapid a proton decay. This behaviour can be traced to the large Yukawa couplings to the first generation that are necessary for finiteness.
1994-04-08
2011-07-19
[ "hep-ph" ]
N. Deshpande, Xiao-Gang He and E. Keith
hep-ph/9404235
Transverse Polarization of Top Quarks Produced at a Photon-Photon Collider
At future $\gamma \gamma$ colliders copious production of $t \bar{t}$ pairs is possible. This would allow a detailed investigation of the interactions involving the top quark. We propose some orrelations which are sensitive to $t \bar{t}$ final state interactions and we compute the QCD and standard model Higgs boson co...
1994-04-08
2014-11-17
[ "hep-ph" ]
W. Bernreuther, J.P. Ma and B.H.J. McKellar
hep-ph/9404230
A Light Scalar Top Quark in MSGUT
We reexamine a possibility for the existence of a light supersymmetric partner of the top quark (stop) with mass 15$\sim$16GeV in the framework of the minimal supergravity GUT model (MSGUT). Such a stop could explain the slight excess of the high $p_{T}$ cross section of the $D^{*\pm}$-meson production in the two-photo...
1994-04-07
2009-09-25
[ "hep-ph" ]
Tadashi Kon and Toshihiko Nonaka
hep-ph/9404232
Muon Number Violating Processes in Single Particle Extensions of the Standard Model
We study the one-loop induced muon number processes when the standard model is minimally extended to include a $\rm SU(2)$ singlet of a charged scalar $h^+$ and a neutral fermion $N$. We find that $\mu \rightarrow e \gamma$ is more sensitive for the former model whereas $\mu-e$ conversion in nuclei for the latter. Effe...
1994-04-07
2009-10-28
[ "hep-ph" ]
Daniel Ng and John N. Ng
hep-ph/9404234
Closing the Light Gluino Window in Supersymmetric Grand Unified Models
We study the light gluino scenario giving special attention to constraints from the masses of the light CP-even neutral Higgs $m_h$, the lightest chargino $m_{\chi^{\pm}_1}$, and the second lightest neutralino $m_{\chi^0_2}$, and from the $b\rightarrow s\gamma$ decay. We find that minimal $N=1$ supergravity, with a rad...
1994-04-07
2014-11-17
[ "hep-ph" ]
Marco Aurelio Diaz
hep-ph/9404233
An improved effective potential for electroweak phase transitions
It is shown that improved potentials and corrected mass terms can be introduced by using a quadratic source term in the path integral construction for the effective action. The advantage of doing things this way is that we avoid ever having to deal with complex propagators in the loop expansion. The resulting effective...
1994-04-07
2009-10-28
[ "hep-ph" ]
Janaki Balakrishnan and Ian G. Moss
hep-ph/9404227
A Simple Way of Calculating Cosmological Relic Density
A simple procedure is presented which leads to a dramatic simplification in the calculation of the relic density of stable particles in the Universe.
1994-04-07
2013-11-13
[ "hep-ph", "astro-ph" ]
Leszek Roszkowski
hep-ph/9404229
Impact Picture Model for Pbar-P Elastic Scattering
The predictions of an impact-picture model for proton-antiproton elastic scattering are compared with the new UA4 experimental data in the Coulomb interference region at the center-of-mass energy of $541 GeV$. The predicted differential cross section, the parameter $\rho$ and the forward slope are in very good agreemen...
1994-04-07
2009-09-25
[ "hep-ph" ]
C. Bourrely
hep-ph/9404231
Finite temperature effective actions for double wells
The problem of calculating the effective potential for a real scalar field with a double--well potential is a possible preliminary to understanding symmetry breaking phase transitions in the early universe. It is argued here that it is necessary to include multiple saddle points in the path integral formalism and that ...
1994-04-07
2007-05-23
[ "hep-ph" ]
Ian G. Moss
hep-ph/9404228
Inclusive particle photoproduction to next-to-leading order
We study the inclusive photoproduction of neutral and charged pions and $\eta$ at HERA, via the resolved photon mechanism, in QCD to next-to-leading order. We present various distributions of phenomenological interest and study the theoretical uncertainties due to the mass scales, and to photon and proton sets of struc...
1994-04-06
2009-09-25
[ "hep-ph" ]
M. Greco, S. Rolli, A. Vicini
hep-ph/9404221
H dibaryon in the QCD sum rule
The QCD sum rule is applied to the H dibaryon and is compared to the flavor non-singlet di-nucleon. We find that the H dibaryon is almost degenerate to the di-nucleon in the $SU(3)_{flavor}$ limit and therefore is not deeply bound as far as th\ e threshold parameter is adjusted not to have a di-nucleon bound state. Aft...
1994-04-06
2016-09-01
[ "hep-ph", "nucl-th" ]
N. Kodama, M. Oka and T. Hatsuda
hep-ph/9404219
Annihilation Cross Sections for Relic Densities in the Low Velocity Limit
A simple method to calculate the total annihilation cross section of massive cold relics is presented. Exact expressions for $\arel$, $\brel$, and $\crel$ of $\sigma \vrel=\arel+\brel \vrel^2+\crel \vrel^4$ are obtained from simple derivatives of the squared annihilation amplitude. Three examples are given. In one exam...
1994-04-06
2016-09-01
[ "hep-ph" ]
James D. Wells
hep-ph/9404225
Single $W_R$ Production in $e^-e^-$ Collisions at the NLC
Single $W_R$ production in $e^-e^-$ collisions at the NLC can be used to probe the Majorana nature of the heavy neutrinos present in the Left-Right Symmetric Model below the kinematic threshold for their direct production. For colliders in the $\sqrt {s}=1-1.5$ TeV range, typical cross sections of order $1-10 fb$ are o...
1994-04-06
2009-10-28
[ "hep-ph" ]
Thomas G. Rizzo
hep-ph/9404226
Top-Down Approach to Unified Supergravity Models
We introduce a new approach for studying unified supergravity models. In this approach all the parameters of the grand unified theory (GUT) are fixed by imposing the corresponding number of low energy observables. This determines the remaining particle spectrum whose dependence on the low energy observables can now be ...
1994-04-06
2009-10-28
[ "hep-ph" ]
Ralf Hempfling
hep-ph/9404223
A New Method for Computing Helicity Amplitudes
An helicity formalism for perturbative calculations is presented. It is based on the formal insertion in spinor lines of a complete set of states built up with unphysical spinors. It is particularly convenient when massive spinors are present. Its application to $e^+\,e^-\,\rightarrow b\,\bar b\,W^+W^-$ is briefly disc...
1994-04-06
2007-05-23
[ "hep-ph" ]
A. Ballestrero and E. Maina
hep-ph/9404220
Production and decay of the Standard Model Higgs Bososn at LEP200
We collect and update theoretical predictions for the production rate and decay branching fractions of the Standard Model Higgs boson that will be relevant for the Higgs search at LEP200. We make full use of the present knowledge of radiative corrections. We estimate the systematics arising from theoretical and experim...
1994-04-06
2009-10-28
[ "hep-ph" ]
Eilam Gross, Bernd A. Kniehl and Gustavo Wolf
hep-ph/9404222
Topologically non--trivial chiral transformations and their representations in a finite model space
The role of chiral transformations in effective theories modeling Quantum Chromo Dynamics is reviewed. In the context of the Nambu--Jona--Lasinio model the hidden gauge and massive Yang--Mills approaches to vector mesons are demonstrated to be linked by a special chiral transformation which removes the chiral field fro...
1994-04-06
2007-05-23
[ "hep-ph" ]
R. Alkofer, H. Reinhardt, J. Schlienz and H. Weigel
hep-ph/9404224
Roles of Diquarks in the Nucleon for the Deep Inelastic Scattering and the Non-leptonic Weak Transitions
We study roles of quark-quark correlations in the baryons for the deep inelastic structure function and the ${\Delta}I=1/2$ rule of the non-leptonic weak hyperon decay. The quark-quark correlation is incorporated phenomenologically as diquarks within the Nambu and Jona-Lasinio model. The strong diquark correlations in ...
1994-04-06
2009-10-28
[ "hep-ph" ]
Katsuhiko Suzuki
hep-ph/9404216
A Note on QED with Magnetic Field and Chemical Potentia
Using a generalized proper-time method, we obtain expressions for the fermion density and the QED effective Lagrangian for an external magnetic field at finite chemical potential. The effective Lagrangian and the density are here written in terms of elementary functions, summed over a finite number of filled Landau lev...
1994-04-05
2009-10-28
[ "hep-ph" ]
D.Persson and Vad.Zeitlin
hep-ph/9404212
Trileptons from Chargino-Neutralino Production at the CERN Large Hadron Collider
We study direct production of charginos and neutralinos at the CERN Large Hadron Collider. We simulate all channels of chargino and neutralino production using ISAJET 7.07. The best mode for observing such processes appears to be $pp\to\tw_1\tz_2\to 3\ell +\eslt$. We evaluate signal expectations and background levels, ...
1994-04-05
2009-10-28
[ "hep-ph" ]
H. Baer, C. H. Chen, F. Paige and X. Tata
hep-ph/9404214
Instanton Contribution to $B \rightarrow X_u e \bar \nu $ Decay
We study instanton effects on inclusive semileptonic $b \rightarrow u$ decay using the heavy quark effective field theory and the operator product expansion. The effect contributes not only to the hadronic matrix element but also to the coefficient functions in the operator product expansion. We find that the coefficie...
1994-04-05
2015-06-25
[ "hep-ph" ]
Junegone Chay and Soo-Jong Rey
hep-ph/9404213
Large relativistic corrections to the positronium decay rate
Relativistic corrections to the positronium decay rate are calculated. They are close to $40(\alpha /\pi)^2$ and $46(\alpha /\pi)^2$ for singlet and triplet states respectively.
1994-04-05
2007-05-23
[ "hep-ph" ]
I.B. Khriplovich and A.I. Milstein
hep-ph/9404215
Quantum Decoherence, Entropy and Thermalization in Strong Interactions at High Energy
Entropy is generated in high-multiplying events by a dynamical separation of strongly interacting systems into partons and unobservable environment modes (almost constant field configurations) due to confinement.
1994-04-05
2011-08-04
[ "hep-ph" ]
Hans-Thomas Elze
hep-ph/9404218
Large scale structure from biased non-equilibrium phase transitions - percolation theory picture
We give an analytical description of the spatial distribution of domain walls produced during a biased nonequilibrium phase transition in the vacuum state of a light scalar field. We discuss in detail the spectrum of the associated cosmological energy density perturbations. It is shown that the contribution coming from...
1994-04-05
2009-10-28
[ "hep-ph" ]
Z. Lalak, S. Lola, B. A. Ovrut and G. G. Ross
hep-ph/9404217
Yukawa Coupling Thresholds: Application to the MSSM and the Minimal Supersymmetric SU(5) GUT
We consider a particular class of threshold corrections to Yukawa couplings and mass relations in the MSSM and supersymmetric grand unified models. We give a complete treatment of Yukawa coupling thresholds at the unification scale $\Mx$ and the effective supersymmetry scale $\Ms$ and apply them to corrections to the t...
1994-04-05
2009-09-25
[ "hep-ph" ]
Brian D. Wright
hep-ph/9404210
Deriving The Standard Model From Superstring Theory
I outline a program to derive the Standard Model directly from superstring theory. I present a class of three generation superstring standard--like models in the free fermionic formulation. I discuss some phenomenological properties of these models. In particular these models suggest an explanation for the top quark ma...
1994-04-04
2007-05-23
[ "hep-ph", "hep-th" ]
Alon E. Faraggi
hep-ph/9404211
Simple But Efficient Tests of QCD from Tau Decays$^{*)}$
We review the determinations of the QCD coupling $\alpha_s$ from the inclusive and exclusive modes of $\tau$-decays. The most recent $\tau$-data provide the average value $ \alpha_ s \left(M^2_\tau \right)\simeq 0.347\pm 0.030 $ corresponding to $ \alpha_ s \left(M^2_Z \right) \simeq 0.121\pm 0.003 \pm 0.001.$ The valu...
1994-04-04
2012-08-27
[ "hep-ph" ]
S. Narison:
hep-ph/9404209
A Heavy Top Quark and the $Zb\bar{b}$ Vertex in Non-Commuting Extended Technicolor
We explore corrections to electroweak parameters in the context of Extended Technicolor (ETC) models in which the ETC gauge-boson which generates the top-quark mass carries weak $SU(2)$ charge. For $m_t \sim 150$ GeV there exist potentially large corrections to the $Z$ decay width to $b$-quarks. Interestingly, in contr...
1994-04-04
2008-11-26
[ "hep-ph" ]
R.S. Chivukula, E.H. Simmons, and J. Terning
hep-ph/9404208
Top Quark As A Topological Color Soliton
In this paper I propose an scenario for the top quark as a topological color soliton. I illustrate some features of the top quark as a soliton in a toy model based on nonlinear realization of the $SU(3)_L \times SU(3)_R / SU(3)_{L+R}$, with $SU(3)_{L+R}$ being the color gauge group.
1994-04-03
2011-01-13
[ "hep-ph" ]
Xinmin Zhang
hep-ph/9404207
SU(3) Breaking Effects in Charmed Meson Decays
The decay rates of $D^+\to\pi^+\pi^0$ and $D^0\to K^+\pi^-$ recently measured by CLEO give the ratios $R_1=2|V_{cs}/V_{cd}|^2\Gamma(D^+\to \pi^+\pi^0)/\Gamma(D^+\to\bar{K}^0 \pi^+)=3.29\pm 1.16$ and $R_2=|V_{cs}^*V_{ud}/(V_{cd}^*V_{us})|^2\Gamma(D^0\to K^+\pi^-)/\Gamma(D^0\to K^-\pi^+)=2.92\pm 1.34\,$. Both are about...
1994-04-02
2009-10-28
[ "hep-ph" ]
Ling-Lie Chau and Hai-Yang Cheng
hep-ph/9404204
Analytical and Numerical Contributions of Some Tenth-Order Graphs Containing Vacuum Polarization Insertions to the Muon (G-2) in QED
The contributions to the g-2 of the muon from some tenth-order (five-loop) graphs containing one-loop and two-loop vacuum polarization insertions have been evaluated analytically in QED perturbation theory, expanding the results in the ratio of the electron to muon mass (m_e /m_\mu). Some results contain also terms kno...
1994-04-01
2009-10-28
[ "hep-ph" ]
S.Laporta
hep-ph/9404202
Clan Properties in Parton Showers
By considering clans as genuine elementary subprocesses, i.e., intermediate parton sources in the Simplified Parton Shower model, a generalized version of this model is defined. It predicts analytically clan properties at parton level in agreement with the general trends observed experimentally at hadronic level and in...
1994-04-01
2009-09-25
[ "hep-ph" ]
R. Ugoccioni, A. Giovannini and S. Lupia
hep-ph/9404206
Chiral Symmetry and the Constituent Quark Model: A Null-Plane Point of View
In order to clarify the connection between {\it current} and {\it constituent} quarks (of u,d,s flavors), several authors have used the lightlike chiral $SU(3)\otimes SU(3)$ algebra as a central concept. This literature is reviewed here with the goal of offering an introduction to the subject within a convenient, unifi...
1994-04-01
2007-05-23
[ "hep-ph" ]
D. Mustaki
hep-ph/9404201
3D Physics and the Electroweak Phase Transition: Perturbation Theory
We develop a method for the construction of the effective potential at high temperatures based on the effective field theory approach and renormalization group. It allows one to sum up the leading logarithms in all orders of perturbation theory. The method reproduces the known one-loop and two-loop results in a very si...
1994-04-01
2009-10-28
[ "hep-ph" ]
K. Farakos, K. Kajantie, K. Rummukainen and M. Shaposhnikov
hep-ph/9404205
Understanding the Standard Model
We explore to what extent the various assumptions behind the standard model as well as the observed quantization of electric charges of quarks and leptons can be understood using the Adler-Bell-Jackiw anomalies. The effect of including a non-zero neutrino mass on these considerations is also discussed.
1994-04-01
2016-11-03
[ "hep-ph" ]
R. N. Mohapatra (University of Maryland)
hep-ph/9403411
Physics Beyond the Standard Model
In these lectures I describe some of the open questions in the standard model relating to the nature and origin of mass, forces and matter and discuss some of the speculative theoretical ideas put forth in this regard. Some of the topics touched upon include supsersymmetry, dynamical symmetry breaking, composite models...
1994-04-01
2007-05-23
[ "hep-ph" ]
Roberto Peccei
hep-ph/9404203
Hyperspherical Integration and the Triple-Cross Vertex Graphs
We have extended the hyperspherical variables method to the analytical calculation of the angular integral of the box graph. We discuss the applications of our results to the analytical calculation of the QED contribution to the electron g-2 of the set of three-loop triple-cross vertex graphs.
1994-04-01
2009-09-25
[ "hep-ph" ]
S.Laporta
hep-ph/9403408
Comment on Transverse Mass Dependence of Partonic Dilepton Production in Ultra-Relativistic Heavy Ion Collisions
Comment on scale breaking effects in dilepton emission from partons during the early stage of ultra-relativistic heavy ion collisions
1994-03-31
2009-10-28
[ "hep-ph" ]
K. Geiger
hep-ph/9403410
Jet Production in Polarized Lepton-Hadron Scattering
We calculate exact analytical expressions for \oas 3-jet and \oasz \\ 4-jet cross sections in polarized deep inelastic lepton nucleon scattering. Introducing an invariant jet definition scheme, we present differential distributions of 3- and 4-jet cross sections in the basic kinematical variables $x$ and $W^2$ as well ...
1994-03-31
2009-10-28
[ "hep-ph" ]
E. Mirkes and C. Ziegler
hep-ph/9403409
Analytic Solutions of QCD Evolution Equations for Parton Cascades Inside Nuclear Matter at Small X
An analytical method is presented to solve generalized QCD evolution equations for the time development of parton cascades in a nuclear environment. Closed solutions for the spectra of produced partons with respect to the variables time, longitudinal momentum and virtuality are obtained under some idealizing assumption...
1994-03-31
2011-07-19
[ "hep-ph" ]
K. Geiger
hep-ph/9403407
The Mass Definition in Hqet and a New Determination of V$_{\text{cb}}$
Positive powers of the mass parameter in a physical quantity calculated with the help of heavy quark effective theory originate from a Wilson coefficient in the matching of QCD and HQET Green function. We show that this mass parameter enters the calculation as a well--defined running current mass. We further argue that...
1994-03-31
2010-11-01
[ "hep-ph" ]
P. Ball, U. Nierste
hep-ph/9403405
Isospin Symmetry Breaking in Hadrons and Nuclei
A brief review of the isospin symmetry breaking in hadrons and nuclei is given with emphasis on the $u-d$ quark mass difference. The off-shell $\rho^0-\omega$ mixing is studied as a typical example of the symmetry breaking, and its relevance to the nuclear force and nuclei is discussed.
1994-03-31
2009-10-28
[ "hep-ph", "nucl-th" ]
Tetsuo Hatsuda
hep-ph/9403406
Electroweak Radiative Corrections, Born Approximation, and Precision Tests of the Standard Model at LEP
We have examined the evidence for the electroweak radiative corrections in the LEP precision data along with the intriguing possibility that the QED corrections only may be sufficient to fit the data. We find that the situation is very sensitive to the precise value of $M_W$. While the world average value of $M_W$ stro...
1994-03-31
2009-09-25
[ "hep-ph" ]
Kyungsik Kang and Sin Kyu Kang
hep-ph/9403403
Deriving the Hard Thermal Loops of QCD from Classical Transport Theory
Classical transport theory is employed to analyze the hot quark-gluon plasma at the leading order in the coupling constant. A condition on the (covariantly conserved) color current is obtained. {}From this condition, the generating functional of hard thermal loops with an arbitrary number of soft external bosonic legs ...
1994-03-31
2011-05-05
[ "hep-ph", "hep-th" ]
P.F. Kelly, Q. Liu, C. Lucchesi and C. Manuel
hep-ph/9403398
Flavour-Violating Charged Lepton Decays in Seesaw-Type Models
Analytic expressions of lepton-flavour- and lepton-number-violating decays of charged leptons are derived in the context of general $SU(2)_L\otimes U(1)_Y$ seesaw scenarios that are motivated by grand unified theories (GUT's) or superstring models, in which left-handed and/or right-handed neutral singlets are present. ...
1994-03-30
2009-10-28
[ "hep-ph" ]
A. Ilakovac and A. Pilaftsis
hep-ph/9403391
Gauge Invariant Treatment of the Electroweak Phase Transition
We evaluate the gauge invariant effective potential for the composite field $\sigma=2\Phi^{\dagger}\Phi$ in the SU(2)-Higgs model at finite temperature. Symmetric and broken phases correspond to the domains $\sigma\leq T^2/3$ and $\sigma > T^2/3$, respectively. The effective potential increases very steeply at small va...
1994-03-30
2009-09-25
[ "hep-ph" ]
W. Buchmuller, Z. Fodor and A. Hebecker
hep-ph/9403392
On Axially Symmetric Solutions in the Electroweak Theory
We present the general ansatz, the energy density and the Chern-Simons charge for static axially symmetric configurations in the bosonic sector of the electroweak theory. Containing the sphaleron, the multisphalerons and the sphaleron-antisphaleron pair at finite mixing angle, the ansatz further allows the construction...
1994-03-30
2010-11-19
[ "hep-ph" ]
Yves Brihaye and Jutta Kunz
hep-ph/9403390
$K_{l4}$ - Decays Beyond One Loop
The matrix elements for $K\rightarrow \pi \pi \l \nu$ decays are described by four form factors $F,G,H$ and $R$. We complete previous calculations by evaluating $R$ at next-to-leading order in the low-energy expansion. We then estimate higher order contributions using dispersion relations and determine the low-energy c...
1994-03-30
2009-09-25
[ "hep-ph" ]
J. Bijnens, G. Colangelo and J. Gasser
hep-ph/9403404
Structural Vertices of Extended SU(3)-Chiral Lagrangians in the Large-N_c Approach
The main goal of this paper is to elaborate the model-framework parametrization of effective coupling constants of the extended chiral lagrangian which is suitable for the description of the low-energy matrix elements of vector, axial-vector, scalar and pseudoscalar currents as well as of the matrix elements of the pse...
1994-03-30
2009-10-28
[ "hep-ph" ]
A. Andrianov, V. Andrianov and V. Yudichev
hep-ph/9403396
J/Psi Production from Electromagnetic Fragmentation in Z decay
The rate for $ Z^{0}\to J/ \psi + \ell^{+}\ell^{-} $ is suprisingly large with about one event for every million $Z^{0}$ decays. The reason for this is that there is a fragmentation contribution that is not suppressed by a factor of $M^{2}_{\psi}/M^{2}_{Z}$. In the fragmentation limit $ M_{Z}\to\infty$ with $E_{\psi}/M...
1994-03-30
2009-10-28
[ "hep-ph" ]
Sean Fleming
hep-ph/9403402
Structure of the Chiral Scalar Superfield in Ten Dimensions
We describe the tensors and spinor-tensors included in the $\theta$-expansion of the ten-dimensional chiral scalar superfield. The product decompositions of all the irreducible structures with $\theta$ and the $\theta^2$ tensor are provided as a first step towards the obtention of a full tensor calculus for the superfi...
1994-03-30
2009-10-28
[ "hep-ph" ]
P. S. Kwon and M. Villasante
hep-ph/9403397
Supersymmetric predictions for the inclusive $b\to s\gamma$ decay
We study the penguin induced transition $b\to s\ \gamma$ in the minimal N=1 supersymmetric extension of the Standard Model with radiative breaking of the electroweak group. We include the effects of one-loop corrections to the Higgs potential and scalar masses. We show that the present upper and lower experimental limi...
1994-03-30
2009-10-28
[ "hep-ph" ]
Stefano Bertolini and Francesco Vissani
hep-ph/9403395
Cosmic Rays From Cosmic Strings
It has been speculated that cosmic string networks could produce ultra-high energy cosmic rays as a by-product of their evolution. By making use of recent work on the evolution of such networks, it will be shown that the flux of cosmic rays from cosmologically useful, that is GUT scale strings, is too small to be used ...
1994-03-30
2014-11-17
[ "hep-ph", "astro-ph" ]
A.J. Gill and T.W.B. Kibble
hep-ph/9403394
Colour Correlations and Multiplicities in Top Events
In events of the type e+ e- -> t tbar -> b W+ bbar W-, particle production could depend in a non-trivial way on the kinematics of the process. Energetic perturbative gluon radiation can be generated (when kinematically allowed) by the original t tbar system and by the t -> b W+ and tbar -> bbar W- decays, with negligib...
1994-03-30
2011-02-15
[ "hep-ph" ]
Valery A. Khoze and Torbjorn Sjostrand
hep-ph/9403401
Gluon Fragmentation into P-wave Heavy Quarkonium
The fragmentation functions for gluons to split into P-wave heavy quarkonium states are calculated to leading order in the QCD coupling constant. Long-distance effects are factored into two nonperturbative parameters: the derivative of the radial wavefunction at the origin and a second parameter related to the probabil...
1994-03-30
2013-11-13
[ "hep-ph" ]
Eric Braaten and Tzu Chiang Yuan
hep-ph/9403389
CP violating polarizations in semileptonic heavy meson decays
We study the $T$-violating lepton transverse polarization ($P^\perp_l$) in three body semileptonic heavy meson decays to pseudoscalar mesons and to vector mesons. We calculate these polarizations in the heavy quark effective limit, which simplifies the expressions considerably. After examining constraints from $CP$ con...
1994-03-30
2010-11-01
[ "hep-ph" ]
Robert Garisto
hep-ph/9403399
Gauge invariance of massless QED
A simple general proof of gauge invariance in QED is given in the framework of causal perturbation theory. It illustrates a method which can also be used in non-abelian gauge theories.
1994-03-30
2009-10-28
[ "hep-ph", "hep-th" ]
Michael Duetsch, Tobias Hurth, Guenter Scharf
hep-ph/9403400
Rigourous QCD Evaluation of Spectrum and Other Properties of Heavy Quarkonium Systems; II Bottomium with n=2, l=0,1
We calculate the Lamb, fine and hyperfine shifts in $b\bar b$ with $n=2$, $l=0,1$. Radiative corrections as well as leading nonperturbative corrections (known to be due to the gluon condensate) are taken into account. The calculation is parameter-free, as we take $\Lambda$, ${\langle \alpha_s G^2 \rangle}$ from indepen...
1994-03-30
2009-10-28
[ "hep-ph" ]
S. Titard and F. J. Yndurain
hep-ph/9403393
gamma-gamma and gamma-p Events at High Energies
A real photon has a complicated nature, whereby it may remain unresolved or fluctuate into a vector meson or a perturbative q-qbar pair. Based on this picture, we previously presented a model for gamma-p events that is based on the presence of three main event classes: direct, VMD and anomalous. In gamma-gamma events, ...
1994-03-30
2007-05-23
[ "hep-ph" ]
Gerhard A. Schuler and Torbjorn Sjostrand
hep-ph/9403382
Measurement of the Branching Fraction for D^+ \to K^- \pi^+ \pi^+
Using the CLEO-II detector at CESR we have measured the ratio of branching fractions, ${\cal B}(D^+\rightarrow K^- \pi^+ \pi^+)/{\cal B}(D^0 \rightarrow K^-\pi^+) = 2.35 \pm 0.16 \pm 0.16$. Our recent measurement of ${\cal B}(D^0 \rightarrow K^-\pi^+)$ then gives ${\cal B}(D^+\rightarrow K^- \pi^+ \pi^+) = (9.3 \pm 0.6...
1994-03-29
2012-08-27
[ "hep-ph", "hep-ex" ]
The CLEO collaboration
hep-ph/9403388
Confinement in Three Dimensions and the Electroweak Phase Transition
The infrared behaviour of the standard model at finite temperature is determined by the confining phase of the SU(2)-Higgs model in three dimensions. Due to the Landau singularity of the three-dimensional gauge theory the perturbative treatment of the electroweak phase transition breaks down for Higgs masses above a cr...
1994-03-29
2009-10-28
[ "hep-ph" ]
W. Buchmuller and Z. Fodor
hep-ph/9403386
Dependence of Electroweak Parameters on the Definition of the Top-Quark Mass
The QCD corrections to electroweak parameters depend on the renormalization scheme and scales used to define the top-quark mass. We analyze these dependences for the W-boson mass predicted via Delta r to O(alpha alpha_s) and O(alpha alpha_s^2) in the on-shell and MS-bar schemes. These variations provide us with a hint ...
1994-03-29
2015-06-25
[ "hep-ph" ]
B.A. Kniehl (FNAL)
hep-ph/9403383
The next-to-leading QCD approximation to the Ellis-Jaffe sum rule
The \alpha_s^2 correction to the Ellis-Jaffe sum rule for the structure function g_1 of polarized deep inelastic lepton-nucleon scattering is calculated.
1994-03-29
2009-10-28
[ "hep-ph" ]
S.A. Larin
hep-ph/9403385
Short and Long Distance Effects in the Decay $\tau \to \pi \nu_\tau (\gamma)$
We calculate the radiative corrections to the decays $\tau\to M \nu_\tau$ and $\pi \to l \nu_\l$, where the meson $M$ is $M=\pi$ or $K$ and the lepton $l$ is $l = e$ or $\mu$. We perform a complete calculation, which includes internal bremsstrahlung and structure dependent radiation in the radiative decays and point me...
1994-03-29
2009-10-28
[ "hep-ph" ]
Roger Decker and Markus Finkemeier
hep-ph/9403384
Waiting for the Top Quark Mass, K^+ --> \pi^+ \nu \bar\nu, B_s^0-\bar{B}_s^0 Mixing and CP Asymmetries in B-Decays
Anticipating improved determinations of m_t, |V_ub/V_cb|, B_K and F_B \sqrt{B_B} in the next five years we make an excursion in the future in order to find a possible picture of the unitarity triangle, of quark mixing and of CP-violation around the year 2000. We then analyse what impact on this picture will have the me...
1994-03-29
2008-11-26
[ "hep-ph" ]
A.J. Buras, M.E. Lautenbacher and G. Ostermaier