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hep-ph/9411346
Hadronic Matter with Internal Symmetries and its Consequences: An Expanding Hadronic Gas
We consider an ideal gas of massive hadrons in thermal and chemical equilibrium. The gas expands longitudinally in accordance with Bjorken law. Strangeness and baryon number conservation is taken into account. This gas has different features as compared to the pion gas.
1994-11-21
2009-09-25
[ "hep-ph" ]
Ludwik Turko
hep-ph/9411350
Searching For SUSY Dark Matter
{\tenrm The possibility of detecting supersymmetric dark matter is examined within the framework of the minimal supergravity model (MSGM), where the $\tilde{Z}_{1}$ is the LSP for almost the entire parameter space. A brief discussion is given of experimental strategies for detecting dark matter. The relic density is co...
1994-11-21
2009-09-25
[ "hep-ph" ]
R. Arnowitt and Pran Nath
hep-ph/9411343
Anomalous Cross Section from Perturbation Theory
We present the anomalous cross section for baryon number violation in the standard model from the perturbation of large-order behavior of forward scattering amplitudes to the order $\left(\epsilon /n\right)^{8/3} \ln\left(\epsilon /n\right)$. An improved high energy behavior of the anomalous cross section is observed. ...
1994-11-21
2009-09-25
[ "hep-ph" ]
TAekoon Lee
hep-ph/9411345
Nonperturbative QCD Effects in High Energy Collisions
High energy hadron-hadron collisions are discussed. It is argued that soft collisions should involve in an essential way nonperturbative QCD. A way is outlined how to calculate properties of high energy elastic hadron-hadron scattering using field theoretic methods. The functional integrals occuring there are evaluated...
1994-11-21
2009-09-25
[ "hep-ph", "nucl-th" ]
Otto Nachtmann
hep-ph/9411342
Cosmic strings
The topic of cosmic strings provides a bridge between the physics of the very small and the very large. They are predicted by some unified theories of particle interactions. If they exist, they may help to explain some of the largest-scale structures seen in the Universe today. They are `topological defects' that may h...
1994-11-19
2010-11-01
[ "hep-ph", "astro-ph", "hep-th" ]
M.B. Hindmarsh and T.W.B. Kibble
hep-ph/9411340
Wolfenstein Parametrization Re-examined
The Wolfenstein parametrization of the $3\times 3$ Kobayashi-Maskawa (KM) matrix $V$ is modified by keeping its unitarity up to the accuracy of $O(\lambda^{6})$. This modification can self-consistently lead to the off-diagonal asymmetry of $V$: $|V_{ij}|^{2}-|V_{ji}|^{2}$ = $Z\displaystyle\sum_{k}\epsilon^{~}_{ijk}$ wi...
1994-11-19
2010-11-01
[ "hep-ph" ]
Zhi-zhong Xing
hep-ph/9411338
The Evolution of the Pion Distribution Amplitude in Next-to-Leading Order
The evolution of the pion distribution amplitude in next-to-leading order is studied for a fixed and a running coupling constant. In both cases, the evolution provides a logarithmic modification in the endpoint region. Assuming a simple parameterization of the distribution amplitude at a scale of $Q_0\sim 0.5\ \rm GeV$...
1994-11-19
2016-09-01
[ "hep-ph" ]
Dieter M\"uller
hep-ph/9411339
Solar Neutrinos
The status of the solar neutrino problem is reviewed. Attempts to explain the observed deficit and spectral distortion, both by astrophysical and particle physics methods, are described. It is argued that the comparison of all experiments strongly prefers the particle physics solutions.
1994-11-19
2011-06-02
[ "hep-ph", "astro-ph" ]
Paul Langacker
hep-ph/9411341
The neutrino cross section and upward going muons
The charged current cross section for neutrinos with energy of a few GeV is reanalysed. In this energy range the cross section for the lowest multiplicity exclusive channels is an important fraction of $\sigma_{CC}$ and the approximation of describing the cross section with deep inelastic scattering formulae may be ina...
1994-11-19
2011-07-19
[ "hep-ph" ]
Paolo Lipari, Maurizio Lusignoli and Francesca Sartogo
hep-ph/9411332
Semi-analytical and Monte Carlo results for the production of four fermions in $e^+ e^-$ collisions
In view of the forthcoming experiments at high energy $e^+ e^-$ colliders, LEP2 and beyond, the process $e^+ e^- \to W^+ W^- \to 4f$ has been investigated for {\it off-shell} $W$'s. After deriving the matrix element for the process within the helicity amplitude formalism, QED radiative corrections to the initial state ...
1994-11-18
2009-10-28
[ "hep-ph" ]
G.Montagna, O.Nicrosini, G.Passarino, F.Piccinini
hep-ph/9411330
Vector Dominance Effects in Weak Radiative Decays of the B Mesons
The long distance vector-meson-dominance (VMD) effects on the weak radiative decays $\bb\to\rho\gamma$ and $\bb^0\to D^{*0}\gamma$ are studied. For $\bb\to\rho\gamma$ decays, the VMD contribution is $(10-20)\%$ of the short-distance penguin amplitude. The pole effect is as important as the VMD one in the decay $B^-\to\...
1994-11-18
2009-10-28
[ "hep-ph" ]
Hai-Yang Cheng
hep-ph/9411333
Signatures of Higgs-Triplet Representations at Tev--e+e- Colliders
We investigate the potential of future TeV linear e^+e^- colliders to observe singly-charged Higgs bosons ($H^\pm$) via the coupling $H^\pm W^\mp Z$, which would signal the existence of exotic Higgs representations. In the context of a Higgs-triplet model compatible with the electroweak oblique parameters, we estimate ...
1994-11-18
2009-10-28
[ "hep-ph" ]
Kingman Cheung, Roger J.N. Phillips, and Apostolos Pilaftsis
hep-ph/9411331
Phenomenological Analysis of a Dimension-Two Operator in QCD and its Impact on $\alpha_{s}(M_{\tau})$
Fits to the ARGUS data on hadronic decays of the tau-lepton, which determine the vector and axial-vector spectral functions, are used in order to determine the size of a dimension $d=2$ term in the Operator Product Expansion. Constraints from the first Weinberg sum rule (in the chiral limit) are enforced in order to re...
1994-11-18
2009-10-28
[ "hep-ph" ]
C. A. Dominguez
hep-ph/9411335
CP violation in the time evolution of the decay K0 -> Pi0 e+ e-
We examine the possibility of extracting CP-violating terms in the decay K0 -> Pi0 e+ e- by studying the time evolution of a K0 beam. We focus on the interference region and search for clear effects. We find that experiments which average over the electron and positron momenta can detect CP violation as an oscillation ...
1994-11-18
2010-11-01
[ "hep-ph" ]
Gerhard O. Koehler, Emmanuel A. Paschos
hep-ph/9411334
Phase Structure and Phase Transition of the SU(2) Higgs Model in Three Dimensions
We derive a set of gauge independent gap equations for Higgs boson and vector boson masses for the SU(2) Higgs model in three dimensions. The solutions can be associated with the Higgs phase and the symmetric phase, respectively. In the Higgs phase the calculated masses are in agreement with results from perturbation t...
1994-11-18
2009-10-28
[ "hep-ph" ]
W.Buchmuller and O.Philipsen
hep-ph/9411336
Thermal photon production in heavy ion collisions
Using a three-dimensional hydrodynamic simulation of the collision and an equation of state containing a first order phase transition to the quark-gluon plasma, we study thermal photon production for $Au+Au$ collisions at $E_{lab}=11.5$ AGeV and for $Pb+Pb$ collisions at $160$ AGeV. We obtain surprisingly high rates of...
1994-11-18
2009-10-28
[ "hep-ph", "nucl-th" ]
N. Arbex, U. Ornik, M. Pl\"umer, A. Timmermann, R.M. Weiner
hep-ph/9411337
Parity Violation in Top Quark Pair Production at the Fermilab Tevatron Collider
The leading weak corrections to the production of top quark pairs via $q\bar{q} \to t\bar{t}$ in $p\bar{p}$ collisions are evaluated. The chromo-anapole form factor of the top quark and effects of parity violation are studied in the Standard Model (SM) and the Minimal Supersymmetric Model (MSSM). The parity violation e...
1994-11-18
2009-10-28
[ "hep-ph" ]
Chung Kao
hep-ph/9411322
Vacuum polarization correction to the positronium decay rate
Corrections $\sim \alpha^2 $ to the positronium decay rate, induced by one--loop vacuum polarization diagram, are calculated. Their relative values are $0.4468(3)(\alpha/\pi)^2$ for para- and $0.960(3)(\alpha/\pi)^2$ for orthopositronium.
1994-11-17
2007-05-23
[ "hep-ph" ]
A.P.Burichenko, D.Yu.Ivanov
hep-ph/9411324
Triplet Higgs bosons at $e^+e^-$ colliders
We investigate the possibility of probing the triplet Higgs boson sector via single charged Higgs production in the process $e^+ e^- \to H^+ l \nu_l$, at high energy electron-positron colliders, using the tree level $H^+W^-Z$ coupling which is a unique feature of such models. We find that even LEP-200 can give nontrivi...
1994-11-17
2009-10-28
[ "hep-ph" ]
R.M. Godbole, B. Mukhopadhyaya and M. Nowakowski
hep-ph/9411323
Renormalized sum rules for structure functions of heavy mesons decays
We consider properties of the structure functions of inclusive heavy meson decays $B\to X_c$ and treat the $c$ quark mass as a free parameter. We show that in two extreme cases of heavy and light $c$ quark the structure functions of heavy--heavy and heavy--light transitions are given by a Fourier transform of the matri...
1994-11-17
2014-11-17
[ "hep-ph" ]
A.G.Grozin and G.P.Korchemsky
hep-ph/9411328
Centauro- and anti-Centauro-type events
Assuming that leading particles in high-energy hadronic and nuclear collisions become sources of a classical pion field, we show that the direct production of pions favors Centauro (mainly charged) events and that the production of pions through the $ \rho$-type channel favors anti-Centauro (mainly neutral) events. We ...
1994-11-17
2010-11-01
[ "hep-ph" ]
M. Martinis, V. Mikuta-Martinis, A. \v{S}varc, and J. \v{C}rnugelj
hep-ph/9411320
Physics Prospects at the Hadron Colliders
I start with a brief introduction to the elementary particles and their interactions, Higgs mechanism and supersymmetry. The major physics objectives of the Tevatron and LHC colliders are identified. The status and prospects of the top quark, charged Higgs boson and superparticle searches are discussed in detail, while...
1994-11-17
2009-10-28
[ "hep-ph" ]
D.P. Roy
hep-ph/9411326
Constraints on the Left-Right Symmetric Model from $b\to s\gamma$
The recent observation by the CLEO Collaboration of the inclusive decay $b\to s\gamma$ with a branching fraction consistent with the expectations of the Standard Model is used to constrain the parameter space of the Left-Right Symmetric Model. Two scenarios are considered: ($i$) equal left- and right- handed Cabibbo-Ko...
1994-11-17
2009-09-25
[ "hep-ph" ]
Thomas G. Rizzo
hep-ph/9411327
Chiral Symmetry Breaking From Dyson-Schwinger Equations
I report on recent progress in the study of mass generation in non-abelian gauge theories, and concentrate on the origin of constituent masses in QCD. I argue that a consistent formalism has been developed to describe chiral symmetry breaking via multiplicatively renormalisable Dyson-Schwinger equations. Its main conse...
1994-11-17
2007-05-23
[ "hep-ph" ]
J.R. Cudell
hep-ph/9411321
Complete Initial State Radiation to off-Shell $Z^0$~PAIR Production in $e^+e^-$~ANNIHILATION
A cross-section calculation for the Standard Model reaction $e^+e^- \rightarrow (Z^0Z^0) \rightarrow f_1\bar{f_1}f_2\bar{f_2}$ including the effects of the finite $Z^0$~width and initial state radiative corrections is presented. The angular phase space integrations are performed analytically, leaving the invariant mass...
1994-11-17
2007-05-23
[ "hep-ph" ]
Dima Bardin, Dietrich Lehner and Tord Riemann
hep-ph/9411325
Introduction to the Physics of Higgs Bosons
A basic introduction to the physics of the Standard Model Higgs boson is given. We discuss Higgs boson production in $e^+e^-$ and hadronic collisions and survey search techniques at future accelerators. The Higgs bosons of the minimal SUSY model are briefly considered. Indirect limits from triviality arguments, vacuum ...
1994-11-17
2007-05-23
[ "hep-ph" ]
Sally Dawson (BNL)
hep-ph/9411329
Can pions created in high-energy heavy-ion collisions produce a Centauro-type effect?
We study a Centauro-type phenomenon in high-energy heavy-ion collisions by assuming that pions are produced semiclassically both directly and in pairs through the isovector channel. The leading-particle effect and the factorization property of the scattering amplitude in the impact-parameter space are used to define th...
1994-11-17
2009-09-25
[ "hep-ph" ]
M. Martinis, V. Mikuta-Martinis, and J. \v{C}rnugelj
hep-ph/9411306
Form factors for Charmed Baryon Decays at order 1/m_c in the HQET limit
We study the vector and axial vector form factors in the heavy to light transitions in charmed baryon decays using HQET. We calculate the 1/m_c corrections to the form factors and show that these corrections can be significant. We also consider applications to semi-leptonic and hadronic decays of charmed baryons.
1994-11-16
2009-10-28
[ "hep-ph" ]
Alakabha Datta
hep-ph/9411317
Charm Production in Hadronic and Heavy-Ion Collisions at RHIC and LHC Energies to $O(\alpha_s^3)$
We present results on rapidity and transverse momentum distributions of inclusive charm quark production in hadronic and heavy-ion collisions at RHIC and LHC energies, including the next-to-leading order, $O(\alpha_s^3)$, radiative corrections and the nuclear shadowing effect. We determine the hadronic and the {\it eff...
1994-11-16
2009-09-25
[ "hep-ph", "nucl-th" ]
Ina Sarcevic and Peter Valerio
hep-ph/9411305
Multi-color QCD at High Energies and Exactly Solvable Lattice Theories
We examine the generalized leading-logarithmic approximation (LLA) equations for compound states of n-reggeized gluons. It is shown that in multi-color QCD, when $N_c \rightarrow \infty$, these equations have a sufficient number of conservation laws to be exactly solvable. Holomorphic factorization of the wave function...
1994-11-16
2007-05-23
[ "hep-ph" ]
L. N. Lipatov and A. Berera
hep-ph/9411309
Relativistic Three-Dimensional Two- and Three-Body Equations on a Null Plane and Applications to Meson and Baryon Regge Trtajectories
We start from a field-theoretical model of zero range approximation to derive three-dimensional relativistic two- and three-body equations on a null plane. We generalize those equations to finite range interactions. We propose a three-body null-plane equation whose form is different from the one presented earlier in th...
1994-11-16
2009-09-25
[ "hep-ph" ]
E. Di Salvo, L.A. Kondratyuk and P. Saracco
hep-ph/9411310
Review on Physics of $e^+e^- \to t\bar{t}$ Near Threshold$^*$
We review the recent developments of studies on $e^+ e^- \to t\bar{t}$ in the threshold region. It has been shown that the top threshold cross sections will be able to provide many important and interesting physics. Due to the large mass and the large decay width of top quark, there will appear a number of unique featu...
1994-11-16
2011-03-02
[ "hep-ph" ]
Y. Sumino
hep-ph/9411311
Semileptonic Kaon Decays
We present the matrix elements for the semileptonic kaon decays $K_{l2\gamma}$ , $K_{l2l^+l^-}$, $K_{l2l'^+l'^-}$,$K_{l3}$, $K_{l3\gamma}$ and $K_{l4}$ at next-to-leading order, and $K_{e5}$ at leading order in Chiral Perturbation Theory and compare the predictions with experimental data. For $K_{l4}$ decays we estimat...
1994-11-16
2009-09-25
[ "hep-ph" ]
J. Bijnens, G. Colangelo, G. Ecker and J. Gasser
hep-ph/9411316
Radiative Corrections to the Decay $\tau\to\pi\nu_\tau$
We have calculated the radiative corrections to the decay $\tau\to \pi(K) \nu_\tau$, taking to account internal bremsstrahlung and structure dependent radiation in the radiative decay and point meson, hadronic structure dependent and short distance contributions in the virtual corrections. We display the spectra of the...
1994-11-16
2009-10-28
[ "hep-ph" ]
Roger Decker, Markus Finkemeier
hep-ph/9411319
A Nonperturbative, Schwinger-Dyson-Equation Analysis of Quark Masses and Mixings in a Model with QCD and Higgs Interactions
The Landau gauge Schwinger-Dyson Equation for the quark self-energy is solved in the quenched ladder approximation for several cases of one- and two-quark-generations. The exchanges of Standard Model gluons and Higgs bosons are taken into account. It is found that Higgs boson exchange dominates the quark self-energy fo...
1994-11-16
2011-07-19
[ "hep-ph" ]
Lesley L. Smith, Pankaj Jain, Douglas W. McKay
hep-ph/9411315
Simple Radiative Neutrino Mass Matrix for Solar and Atmospheric Oscillations
A simple 3 X 3 neutrino mass matrix is proposed to accommodate both the solar and atmospheric neutrino deficits. This scenario can be realized naturally by a radiative mechanism for the generation of neutrino masses. It also goes together naturally with electroweak baryogenesis and cold dark matter in a specific model.
1994-11-16
2010-01-06
[ "hep-ph", "astro-ph" ]
Ernest Ma (UC Riverside)
hep-ph/9411313
Electroweak Condensates at Standard Top Mass Values
In the two Higgs doublet model, perturbativity breaks down below the Planck scale: For top mass values 170-180 GeV, the Yukawa coupling reaches the pole below 1000 TeV, if the ratio of vev's v_u/v_d is below 1. We discuss top condensate scenarios for 150 GeV < m_top < 200 GeV, showing that a version with two composite ...
1994-11-16
2007-05-23
[ "hep-ph" ]
R. Bonisch
hep-ph/9411318
Tests for Tau's Charged-Current Structure
The Lorentz structure of the tau lepton's charged-current can almost be completely determined by use of stage-two spin-correlation functions for the $\{\rho ^{-},\rho ^{+}\}$ and $\{a_1^{-},a_1^{+}\}$ decay modes It is possible to test for a ``(V-A) + something'' structure in the ${J^{Charged}}_{Lepton}$ current, so as...
1994-11-16
2015-06-25
[ "hep-ph" ]
Charles A. Nelson
hep-ph/9411314
Higgs and Z boson decays into light gluinos
We calculate the decay rate of scalar and pseudoscalar Higgs bosons into a pair of gluinos, within the Minimal Supersymmetric Standard Model. In the theoretically and experimentally allowed light gluino window, $\mg \sim $ 3--5 GeV, gluino pairs can completely dominate the decays of the light scalar Higgs boson and pla...
1994-11-16
2009-10-28
[ "hep-ph" ]
A. Djouadi and M. Drees
hep-ph/9411312
Infrared Renormalons and Power Corrections in Deep-Inelastic Sum Rules
Infrared renormalons and $1/Q^2$ power corrections in deep-inelastic sum rules are studied. The renormalization of operators with power divergence are discussed. The higher-twist terms in the operator product expansion are shown to account for the residual soft contributions survived from the Kinoshita-Lee-Nauenberg ty...
1994-11-16
2015-06-25
[ "hep-ph" ]
Xiangdong Ji, MIT
hep-ph/9411307
Bose-Einstein Correlations for Systems with Large Halo
Model-independent considerations are presented for the calculation of Bose-Einstein correlation functions and momentum distributions which describe boson-emitting systems containing a central part surrounded by a large halo. If the characteristic geometrical size of the halo is sufficiently large, the contributions of ...
1994-11-16
2015-06-25
[ "hep-ph", "nucl-th" ]
T. Csorgo, B. Lorstad and J. Zimanyi
hep-ph/9411308
Perturbative QCD Analysis of $B$ Meson Decays
Resummation of large QCD radiative corrections, including leading and next-to-leading logarithms, in pion electromagnetic form factor is reviewed. Similar formalism is applied to exclusive processes involving heavy mesons, and leads to Sudakov suppression for the semi-leptonic decay $B\to\pi l\nu$. It is found that, wi...
1994-11-16
2009-09-25
[ "hep-ph" ]
Hsiang-nan Li and Hoi-Lai Yu
hep-ph/9411303
Spin symmetry predictions for heavy quarkonia alignment
We investigate the implications of spin symmetry for heavy quarkonia production and decay. We first compare spin symmetry predictions for charmonia and bottomonia radiative transitions with data and find they agree quite well. We next use spin symmetry along with nonrelativistic QCD power counting to determine the lead...
1994-11-15
2010-11-01
[ "hep-ph" ]
Peter Cho and Mark B. Wise
hep-ph/9411304
CP Violating Metastable States and Baryogenesis in the Hot Standard Model
We discuss a novel form of CP violation in the standard model. It takes place at temperatures of the order of the electroweak transition, when two regions with different values of the Wilson line are juxtaposed. This CP violation is maximal. A sufficient condition is simply the existence of a long-lived metastable stat...
1994-11-15
2010-11-01
[ "hep-ph", "hep-th" ]
C.P. Korthals Altes and N.J. Watson (Marseille)
hep-ph/9411298
Limit on the Color-Triplet Higgs Mass in the Minimum Supersymmetric SU(5) Model
In the minimum supersymmetric SU(5) GUT, we derive the upper limit on the mass of the color-triplet Higgs multiplets as $\mhc\leq 2.4\times 10^{16}~\GEV$ (90 \% C.L.) taking all possible corrections into account in a renormalization group analysis. If the above upper limit is compared with a limit on $\mhc$ from the ne...
1994-11-15
2009-10-28
[ "hep-ph" ]
J. Hisano, T. Moroi, K. Tobe, and T. Yanagida
hep-ph/9411301
The Production and Decay of Hybrid Mesons by Flux-Tube Breaking
An analytic calculation of the breaking of excited chromoelectric flux-tubes is performed in an harmonic oscillator approximation and applied to predict the dynamics of all $J^{PC}$ low-lying gluonic excitations of mesons (hybrids). Widths, branching ratios and production dynamics of some recently discovered $J^{PC} = ...
1994-11-15
2008-11-26
[ "hep-ph" ]
F.E.Close and P.R.Page
hep-ph/9411299
Solar Neutrino Data, Neutrino Magnetic Moments and Flavor Mixing
The results of all currently operating solar neutrino experiments are analyzed in the framework of the resonant neutrino spin--flavor precession scenario including the effects of neutrino mixing. Nine different profiles of the solar magnetic field are used in the calculations. It is shown that the available experimenta...
1994-11-15
2009-09-25
[ "hep-ph", "astro-ph" ]
E.Kh. Akhmedov, A. Lanza, S.T. Petcov
hep-ph/9411297
Four-fermion decay of Higgs bosons
We calculate four-fermion decays of a Higgs boson via $WW$ and/or $ZZ$ intermediate states for Higgs masses below $m_W$. We examine models with a doubly-charged Higgs boson $H^{++}$ and show that the four-fermion decay is the dominant mode for a wide range of parameter space. Existing searches for $H^{++}$ in $Z$ decay...
1994-11-15
2009-09-25
[ "hep-ph" ]
T. Asaka and Ken-ichi Hikasa
hep-ph/9411300
Baryon Chiral Perturbation Theory A.D. 1994
In these lectures, the status of baryon chiral perturbation theory is reviewed. Particular emphasis is put on the two--flavor sector and the physics related to electromagnetic probes. I discuss in some detail the structure of the effective Lagrangian at next--to--leading order, the meaning of low--energy theorems in Co...
1994-11-15
2011-04-15
[ "hep-ph", "nucl-th" ]
Ulf-G. Mei{\ss}ner
hep-ph/9411302
Quark exchange model for charmonium dissociation in hot hadronic matter
A diagrammatic approach to quark exchange processes in meson-meson scattering is applied to the case of inelastic reactions of the type $(Q\barQ)+(q\barq)\rightarrow (Q\barq) + (q\barQ)$, where $Q$ and $q$ refer to heavy and light quarks, respectively. This string-flip process is discussed as a microscopic mechanism fo...
1994-11-15
2009-09-25
[ "hep-ph" ]
K. Martins, D. Blaschke and E. Quack
hep-ph/9411287
Neutral pion photoproduction off nucleons revisited
We investigate threshold pion photoproduction in the framework of heavy baryon chiral perturbation theory. We give the expansion of the electric dipole amplitude $E_{0+}$ to three orders in $\mu$, the ratio of the pion to nucleon mass, and show that it is slowly converging. We argue that this observable is not a good t...
1994-11-14
2009-09-25
[ "hep-ph", "nucl-th" ]
V. Bernard, N. Kaiser, Ulf-G. Mei{\ss}ner
hep-ph/9411288
Jarlskog-like invariants for theories with scalars and fermions
Within the framework of theories where both scalars and fermions are present, we develop a systematic prescription for the construction of CP-violating quantities that are invariant under basis transformations of those matter fields. In theories with Spontaneous Symmetry Breaking, the analysis involves the vevs' transf...
1994-11-14
2010-11-01
[ "hep-ph" ]
F. J. Botella and Joao P. Silva
hep-ph/9411295
The '3-1' model: the minimal model of calculable dynamical sypersymmetry breaking
paper is withdrawn - the model lacks a stable ground state
1994-11-14
2008-02-03
[ "hep-ph", "hep-th" ]
Erich Poppitz and Lisa Randall
hep-ph/9411290
Natural $\mu$-term with Peccei-Quinn Symmetry
The generalized Higgs mass term $NH_1H_2$ of the supersymmetric standard model is used to implement the Peccei-Quinn Symmetry to solve the strong-CP problem. Then supersymmetry breaking can generate the Higgs mass parameter $\mu$ of order $m_{3/2}$ through soft-breaking parameters. This kind of extension contains extra...
1994-11-14
2010-11-01
[ "hep-ph" ]
E. J. Chun
hep-ph/9411285
Light Quark Masses from QCD
We study the value of the light quark masses combination $m_u+m_d$ in QCD using both Finite Energy Sum Rules and Laplace Sum Rules. We have performed a detailed analysis of both the perturbative QCD and the hadronic parametrization inputs needed in these Sum Rules. As main result, we obtain $m_u\left(1~{\rm GeV}^2\righ...
1994-11-14
2008-11-26
[ "hep-ph" ]
Johan Bijnens, Joaquim Prades and Eduardo de Rafael
hep-ph/9411289
The tau weak-magnetic dipole moment
We calculate the prediction for the anomalous weak-magnetic form factor of the tau lepton at $q^2=M_Z^2$ within the Standard Model. With all particles on-shell, this is a electroweak gauge invariant quantity. Its value is $a_\tau^w (M_Z^2)= - \;(2.10 + 0.61\, i) \times 10^{-6}$. We show that the transverse and normal c...
1994-11-14
2016-08-14
[ "hep-ph" ]
J. Bernab\'eu, G.A. Gonz\'alez-Sprinberg, M.Tung and J. Vidal
hep-ph/9411286
Nonleptonic weak decays of charmed mesons
A previous analysis of two-body Cabibbo allowed nonleptonic decays of $D^0$ mesons and of Cabibbo allowed and first-forbidden decays of $D^+$ and $D_s^+$ has been adjourned using more recent experimental data and extended to the Cabibbo forbidden decays of $D^0$. Annihilation and W-exchange contributions as well as fin...
1994-11-14
2008-11-26
[ "hep-ph" ]
F. Buccella, M. Lusignoli, G. Miele, A. Pugliese and P. Santorelli
hep-ph/9411284
Latest Developments on the Bess Model
The idea of a strongly interacting sector as responsible for the electroweak symmetry breaking is tested through an effective lagrangian description, called the BESS model, constructed on the standing point of custodial symmetry and gauge invariance, without specifing any dynamical scheme.
1994-11-14
2007-05-23
[ "hep-ph" ]
Pierre Chiappetta
hep-ph/9411291
The Bess Model at Future Colliders
The BESS model consists of an effective lagrangian parametrization with dynamical symmetry breaking, describing scalar, vector and axial-vector bound states in a rather general framework. After a brief description of the model and its generalizations, predictions for physics at future accelerators are given both for LH...
1994-11-14
2007-05-23
[ "hep-ph" ]
A.Deandrea
hep-ph/9411294
The Dilepton-Production Cross Section in Principal Value Resummation
Using a recent calculation of the perturbative hard part for dilepton production that sums large threshold corrections to all orders in perturbative QCD, we compute the corresponding cross sections. The hard part has been evaluated using principal value resummation and contains all singular momentum-dependent correctio...
1994-11-14
2009-10-28
[ "hep-ph" ]
Lyndon Alvero (ITP, SUNY at Stony Brook; Physics Dept, PSU) and Harry Contopanagos (Argonne National Lab.)
hep-ph/9411292
${1\over m_b}$ and ${1\over m_t}$ Expansion of the Weak Mixing Matrix
We perform a $1/m_b$ and $1/m_t$ expansion of the Cabibbo-Kobayashi- Maskawa mixing matrix. Data suggest that the dominant parts of the Yukawa couplings are factorizable into sets of numbers $\vert r>$, $\vert s>$, and $\vert s'>$, associated, respectively, with the left-handed doublets, the right-handed up singlets, a...
1994-11-14
2010-11-01
[ "hep-ph" ]
York-Peng Yao
hep-ph/9411283
Wave Function Properties in a High Energy Process
A model example is given of how properties of the hadronic light-cone wave function are revealed in a particular high energy process. The meson wave function is derived in scalar quark QCD. We apply it to compute the form of the cross section for lossless diffractive jet-production, an upcoming possiblity at HERA.
1994-11-14
2007-05-23
[ "hep-ph" ]
Arjun Berera
hep-ph/9411296
Moments of lepton spectrum in B decays and the $m_b - m_c$ quark mass difference
It is argued that the quark mass difference $m_b-m_c$ can be extracted with a high accuracy from experimental data on ratia of moments of lepton energy spectrum in semileptonic decays of $B$ mesons. Theoretical expressions for the moments are presented, which include perturbative as well as non-perturbative corrections...
1994-11-14
2011-01-25
[ "hep-ph" ]
Mikhail Voloshin
hep-ph/9411293
The Relevant Scale Parameter in the High Temperature Phase of QCD
We introduce the running coupling constant of QCD in the high temperature phase, $\tilde{g}^2(T)$, through a renormalization scheme where the dimensional reduction is optimal at the one-loop level. We then calculate the relevant scale parameter, $\Lambda_T$, which characterizes the running of $\tilde{g}^2(T)$ with $T$,...
1994-11-14
2010-11-01
[ "hep-ph", "hep-lat", "nucl-th" ]
Suzhou Huang and Marcello Lissia
hep-ph/9411282
Radiative corrections to $b\to c\tau\bat\nu_\tau$
Analytical calculation is presented of the QCD radiative corrections to the rate of the process $b\to c\tau\bar\nu_\tau$ and to the $\tau$ lepton longitudinal polarization in $\tau\bar\nu_\tau$ rest frame. The results are given in the form of one dimensional infrared finite integrals over the invariant mass of the lept...
1994-11-13
2011-01-25
[ "hep-ph" ]
Andrzej Czarnecki, Marek Jezabek and Johann H. Kuhn
hep-ph/9411279
The Baryon Spectrum and Chiral Dynamics
The fine structure of the low energy part of the nucleon and strange hyperon spectra, which are formed of single states without parity doublets, may be understood in terms of an $SU(3)$ flavor-symmetric quark-quark interaction that describes chiral pseudoscalar boson exchange. The model predicts the fine structure spli...
1994-11-12
2011-04-20
[ "hep-ph" ]
L. Ya. Glozman, D.O. Riska
hep-ph/9411277
Probing Anomalous Quartic Vector Boson Couplings in $e^-e^-$ Collisions
We study the incidence of genuine quartic vector boson couplings in the reactions e-e- -> e-e-ZZ, e-\nu ZW, \nu\nu WW. We find that a linear collider operated in the e-e- mode will provide bounds on these couplings which are competitive with those to be obtained in the e+e- mode.
1994-11-12
2009-10-28
[ "hep-ph" ]
Frank Cuypers (MPI Munich) and Karol Kolodziej (University of Munich)
hep-ph/9411280
The Vertex Corrections in Technicolor Model without Exact Custodial Symmetry
We discuss the effects of isospin breaking which appear in the vertex corrections for $Zb \bar{b}$, $Z\tau^+\tau^-$ and $W\nu\tau$ in a one-family technicolor model without exact custodial symmetry. By means of the effective lagrangian approach we compute the vertex corrections for $Zb\bar{b}$, $Z\tau\tau$ and $W\tau\n...
1994-11-12
2015-06-25
[ "hep-ph" ]
Tadashi YOSHIKAWA (Hiroshima)
hep-ph/9411281
The march towards no-scale supergravity
The different steps that led us to the discovery of {\em no-scale supergravity} are discussed from a very personal point of view. No-scale supergravity has been heralded as the most promising effective theory that describes physics below the Planck scale. In its string-derived form it holds the potential for a Dynamica...
1994-11-12
2008-02-03
[ "hep-ph", "hep-th" ]
D. Nanopoulos
hep-ph/9411278
Muon decays with lepton--number violation via vector leptoquark
The decays $\mu \rightarrow e \gamma$, $\mu \rightarrow e \gamma \gamma$, and $\mu \rightarrow e e \bar e$ are analysed in the framework of the Pati-Salam type quark-lepton symmetry $SU(4)_V \otimes SU(2)_L \otimes G_R$ where the effects of mixing in the quark-lepton currents are taken into account. It is shown that th...
1994-11-12
2009-10-28
[ "hep-ph" ]
A.A.Gvozdev, A.V.Kuznetsov, N.V.Mikheev and L.A.Vassilevskaya
hep-ph/9411274
Almost Degenerate Neutrinos with Maximal Mixing
If the upper limit on the effective (Majorana) neutrino mass from neutrinoless double beta decay experiments is confirmed to be much less than an electron-volt, then one way to reconcile it with the degenerate neutrino mass pattern suggested recently to explain the observed deficit of solar and atmospheric neutrinos as...
1994-11-11
2010-11-01
[ "hep-ph" ]
R. N. Mohapatra and S. Nussinov
hep-ph/9411272
Nucleosynthesis and the Time Dependence of Fundamental Couplings
We consider the effects of the time dependence of couplings due to their dependence on a dilaton field, as occurs in superstring theory, as well as in gravity theories of the Jordan-Brans-Dicke type. Because the scale parameters of couplings set by dimensional transmutation depend exponentially on the dilaton vev, we m...
1994-11-11
2009-09-15
[ "hep-ph", "astro-ph" ]
Bruce A. Campbell and Keith A. Olive
hep-ph/9411270
Past-Future Interference in $\Phi$-Decays into Entangled Kaon Pairs
Quantum interference effects between past and future events (neutral kaon transitions, including CP violating decays) are discussed for entangled kaon pairs produced through $\phi \to K^0 \bar{K^0}$ in $\phi$-factories. Contrasting with the exciting conclusions of other recent analyses, we predict the inexistence of su...
1994-11-11
2009-10-28
[ "hep-ph", "quant-ph" ]
B. Ancochea, A. Bramon
hep-ph/9411266
Analytic Structure of the Quark Propagator in a Model with an infrared vanishing Gluon Propagator
The Dyson-Schwinger equation for the quark self energy is solved in rainbow approximation using an infrared (IR) vanishing gluon propagator that introduces an IR mass scale $b$. There exists a $b$ dependent critical coupling indicating the spontaneous breakdown of chiral symmetry. If one chooses realistic QCD coupling ...
1994-11-11
2014-11-17
[ "hep-ph" ]
Axel Bender and Reinhard Alkofer
hep-ph/9411267
Reanalysis of hyperon beta decay data on $F/D$
We reanalyse hyperon beta decay data to extract the corresponding F and D values. We show that flavour symmetry breaking effects lead naturally to a reduction of the $F/D$ ratio. For proton and neutron our analyses suggests $F/D = 0.49 \pm 0.08$ instead of $F/D = 0.575 \pm 0.016$ which is generally used to analyse the ...
1994-11-11
2009-10-28
[ "hep-ph" ]
B.~Ehrnsperger and A.~Sch\"afer
hep-ph/9411268
Probing the Higgs mechanism via $\gamma\gamma\to W^+W^-$
We investigate the sensitivity of the reaction $\gamma\gamma\to W^+W^-$ to the Higgs sector based on the complete one-loop corrections in the minimal Standard Model and the gauged non-linear $\sigma$-model. While this sensitivity is very strong for the suppressed cross-section of equally polarized photons and longitudi...
1994-11-11
2008-11-26
[ "hep-ph" ]
A.Denner, S.Dittmaier and R.Schuster
hep-ph/9411276
Squark and Slepton Mass Relations in Grand Unified Theories
In the minimal supersymmetric standard model, assuming universal scalar masses at large energies, there are four intragenerational relations between the masses of the squarks and sleptons for each light generation. In this paper we study the scalar mass relations which follow only from the assumption that at large ener...
1994-11-11
2009-10-28
[ "hep-ph" ]
H.-C. Cheng and L.J. Hall
hep-ph/9411273
Electric dipole moments as a test of supersymmetric unification
In a class of supersymmetric grand unified theories, including those based on the gauge group $SO(10)$, there are new contributions to the electric dipole moments of the neutron and electron, which arise as a heavy top quark effect. These contributions arise from CKM-like phases, not from phases of the supersymmetry br...
1994-11-11
2010-11-01
[ "hep-ph" ]
S. Dimopoulos and L. J. Hall
hep-ph/9411269
Effective Chiral Lagrangians with an SU(3)-Broken Vector-Meson Sector
The accuracy of effective chiral lagrangians including vector-mesons as (hidden symmetry) gauge fields is shown to be improved by taking into account SU(3)-breaking in the vector-meson sector. The masses, $M_V$, and couplings to the photon field and pseudoscalar pairs, $f_{V\gamma}$ and $g_{VPP}$, are all consistently ...
1994-11-11
2009-10-28
[ "hep-ph" ]
A. Bramon, A. Grau, G. Pancheri
hep-ph/9411271
Standard Model predictions for weak decays of $\eta$ mesons
The branching ratios of weak decays of $\eta$ mesons are estimated in the framework of the Standard Model. To observe such decays, $\eta$ meson sources with $N_{\eta} > 10^{13}$ per year are needed.
1994-11-11
2007-05-23
[ "hep-ph" ]
A. Bramon, E. Shabalin
hep-ph/9411275
An Introduction To The Theory Of Heavy Mesons And Baryons
Introductory lectures (delivered at TASI, June 1994) on heavy quarks and heavy quark effective field theory. Applications to inclusive semileptonic decays and to interactions with light mesons are covered in detail.
1994-11-11
2016-12-15
[ "hep-ph" ]
Benjamin Grinstein
hep-ph/9411260
The Large Quark Mass Expansion of Gamma (Z^0 -> hadrons) and Gamma(tau^- -> nu_tau + hadrons) in the Order alpha_s^3
We present the analytical $\alpha_{s}^3$ correction to the $Z^{0}$ decay rate into hadrons. We calculate this correction up to (and including) terms of the order $(m_Z^2/m_{top}^2)^3$ in the large top quark mass expansion. We rely on the technique of the large mass expansion of individual Feynman diagrams and treat its...
1994-11-10
2009-10-28
[ "hep-ph" ]
S. A. Larin, T. van Ritbergen, J. A. M. Vermaseren
hep-ph/9411259
The $\pi\pi$ Amplitude in Generalized Chiral Perturbation Theory
The $\pi\pi$ interaction is studied at one loop order in the framework of Generalized Chiral Perturbation theory
1994-11-10
2007-05-23
[ "hep-ph" ]
M. Knecht, B. Moussallam and J. Stern
hep-ph/9411265
QCD sum rules for $\Delta$ isobar in nuclear matter
The self-energies of $\Delta$ isobar propagating in nuclear matter are calculated using the finite-density QCD sum-rule methods. The calculations show that the Lorentz vector self-energy for the $\Delta$ is significantly smaller than the nucleon vector self-energy. The magnitude of the $\Delta$ scalar self-energy is la...
1994-11-10
2009-09-25
[ "hep-ph" ]
Xuemin Jin
hep-ph/9411258
A Vector-like Extension of the Standard Model
A vector-like extension of the standard model for heavier quarks and leptons with $SU(2)\times U(1)$ gauge symmetry and only one Higgs doublet is examined. This scheme incorporates infinitely many fermions and avoids the appearance of a strongly interacting sector. The model is perturbatively well controllable, and con...
1994-11-10
2017-02-01
[ "hep-ph" ]
Kazuo Fujikawa
hep-ph/9411263
Massive Schwinger Model for Small Fermion Mass
We examine QED$_{1+1}$ (the massive Schwinger model) to extend existing perturbation results in $m_f/m_b$, and compare our results with lattice and DLCQ calculations. (Based on a talk presented by J.P. Vary at ``Theory of Hadrons and Light-Front QCD'', Polona Zgorzelisko, Poland, August 1994.)
1994-11-10
2007-05-23
[ "hep-ph" ]
J.P. Vary, T.J. Fields, H.J. Pirner
hep-ph/9411262
Probing Anomalous Gauge Boson Couplings at LEP
We bound anomalous gauge boson couplings using LEP data for the $Z\rightarrow {\overline f} f$ partial widths. We use an effective field theory formalism to compute the one-loop corrections resulting from non-standard model three and four gauge boson vertices. We find that measurements at LEP constrain the three gauge ...
1994-11-10
2007-05-23
[ "hep-ph" ]
S. Dawson (BNL) and G. Valencia (Iowa)
hep-ph/9411264
Heavy Quark Theory
Recent progress in the theory of hadrons containing a single heavy quark is reviewed. Particular attention is paid to those aspects that bear on the determination of the magnitudes of the Cabibbo--Kobayashi--Maskawa matrix elements $V_{cb}$ and $V_{ub}$.}
1994-11-10
2007-05-23
[ "hep-ph" ]
Mark B. Wise
hep-ph/9411261
A Catching Trap for All Antiproton Seasons
We describe the origin, development, and status of the Los Alamos antiproton catching trap. Originally designed for the antiproton gravity experiment, it now is clear that this device can be a source of low-energy antiprotons for a wide range of physics, both on site, at CERN, and also off site.
1994-11-10
2009-10-28
[ "hep-ph" ]
Michael Martin Nieto and Michael H. Holzscheiter
hep-ph/9411255
Light thresholds in Grand Unified Theories
In a generic Grand Unified Theory with a relatively small dispersion of the spectrum around the $Z$-boson and the unification masses, a connection is established, exact at one loop level, between $M_Z$, $G_{\rm F}$, $\alpha(M_Z)$ and the strong coupling constant $\alpha_3(M_Z)$. At this level of precision, this avoids ...
1994-11-09
2009-10-09
[ "hep-ph" ]
R. Barbieri, P. Ciafaloni and A. Strumia
hep-ph/9411256
Possible Light U(1) Gauge Boson Coupled to Baryon Number
We discuss the phenomenology of a light U(1) gauge boson, $\gamma_B$, that couples only to baryon number. We assume that the new U(1) gauge symmetry is spontaneously broken and that the $\gamma_B$ mass is smaller than $m_Z$. Nevertheless, we show that the model survives the current experimental constraints. In addition...
1994-11-09
2009-09-29
[ "hep-ph" ]
Christopher D. Carone and Hitoshi Murayama (LBL)
hep-ph/9411251
Finite Energy Instantons in the O(3) Non-Linear Sigma Model
We consider winding number transitions in the two dimensional O(3) non-linear sigma model, modified by a suitable conformal symmetry breaking term. We discuss the general properties of the relevant instanton solutions which dominate the transition amplitudes at finite energy, and find the solutions numerically. The Euc...
1994-11-09
2007-05-23
[ "hep-ph", "hep-th" ]
Peter G. Tinyakov, Emil Mottola, and Salman Habib
hep-ph/9411253
Generalized Chiral Perturbation Theory
The Generalized Chiral Perturbation Theory enlarges the framework of the standard $\chi$PT, relaxing certain assumptions which do not necessarily follow from QCD or from experiment, and which are crucial for the usual formulation of the low energy expansion. In this way, experimental tests of the foundations of the sta...
1994-11-09
2009-10-28
[ "hep-ph" ]
M. Knecht, J. Stern
hep-ph/9411257
The Effective Use of Precision Electroweak Measurements
Several reasonably model-independent formulations of the implications of new physics for precision electroweak measurements have been developed over the past years, most notably by Peskin and Takeuchi, and by Altarelli \etal. These formulations work by identifying a small, but useful, set of parameters through which ne...
1994-11-09
2015-06-25
[ "hep-ph" ]
C.P. Burgess
hep-ph/9411254
Anomalies in Quantum Field Theory: Dispersion Relations and Differential Geometry
We present two different aspects of the anomalies in quantum field theory. One is the dispersion relation aspect, the other is differential geometry where we derive the Stora--Zumino chain of descent equations.
1994-11-09
2009-10-28
[ "hep-ph" ]
R. A. Bertlmann
hep-ph/9411252
Gauge Dependence of the High-Temperature 2-Loop Effective Potential for the Higgs Field
The high-temperature limit of the 2-loop effective potential for the Higgs field is calculated from an effective 3d theory, in a general covariant gauge. It is shown explicitly that a gauge-independent result can be extracted for the equation of state from the gauge-dependent effective potential. The convergence of per...
1994-11-09
2010-11-01
[ "hep-ph" ]
M. Laine
hep-ph/9411243
Tests of gauge boson couplings in polarized $e^-\gamma$ collisions
Single $W$-boson production in $e^-\gamma$ collisions with polarized beams is investigated. Helicity amplitudes for general couplings are derived and their properties are discussed. The results are applied to the Standard Model (SM) and the left-right model. In the framework of SM the updated estimates of the measureme...
1994-11-08
2009-10-28
[ "hep-ph" ]
Martti Raidal
hep-ph/9411246
Direct Instanton Effects in Current-Current Correlators
We compute the effect of small-size instantons on the coefficient function of the chiral condensate in the operator product expansion of current-current correlators. Furthermore, we also compute the instanton corrections associated with four-quark and six-quark operators in the factorization approximation. We discuss t...
1994-11-08
2009-10-28
[ "hep-ph" ]
Paolo Nason and Matteo Palassini
hep-ph/9411240
On the lagrangian of N=1, D=10 dual supergravity
It is shown how one can construct the lagrangian of dual supergravity by means of the equations of motion derived from the superspace approach.
1994-11-08
2009-07-28
[ "hep-ph" ]
K.N.Zyablyuk
hep-ph/9411237
Comparison of Discovery Limits for Extra Z Bosons at Future Colliders
We study and compare the discovery potential for heavy neutral gauge bosons ($Z'$) at various $e^+e^-$ and $p\stackrel{(-)}{p}$ colliders that are planned or have been proposed. Typical discovery limits are for the TEVATRON $\sim 1$ TeV, DI-TEVATRON $\sim 2$ TeV, LHC $\sim 4$ TeV, LSGNA (a 60 TeV $pp$ collider) $\sim 1...
1994-11-08
2011-07-19
[ "hep-ph" ]
Stephen Godfrey (Carleton University)