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hep-ph/9405309
Damping Rate of a Hard Photon in a Relativistic Plasma
The damping rate of a hard photon in a hot relativistic QED and QCD plasma is calculated using the resummation technique by Braaten and Pisarski.
1994-05-17
2009-10-28
[ "hep-ph" ]
Markus H. Thoma
hep-ph/9405305
Phase Transition in Extended Electroweak Theory
The phase transition in the Weinberg-Salam-Glashow (GSW) electroweak theory extended by the majoron and dilaton field is considered. The possibility of the boson condensation in the extreme conditions in the standard electroweak theory is shown. The first order phase transition induces by the radiative corrections (the...
1994-05-16
2007-05-23
[ "hep-ph", "astro-ph" ]
R. Ma'nka
hep-ph/9405302
Model-independent determination of $Z'$ couplings at LEP 200
All couplings of a new heavy gauge boson to ordinary fermions can be determined in a model-independent way at a large $e^+e^-$ collider for large enough statistics. No such determination is possible at LEP 200, however, because its design integrated luminosity is too low for existing and forthcoming limits on $Z'$ inte...
1994-05-16
2011-01-25
[ "hep-ph" ]
F. del Aguila
hep-ph/9405300
Search for the QCD Ground State
Within the Euclidean effective action approach we propose criteria for the ground state of QCD. Despite a nonvanishing field strength the ground state should be invariant with respect to modified Poincar\'e transformations consisting of a combination of translations and rotations with suitable gauge transformations. We...
1994-05-16
2011-07-19
[ "hep-ph" ]
M. Reuter, C. Wetterich
hep-ph/9405304
Bloch-Nordsieck cancellations beyond logarithms in heavy particle decays
We investigate the one-loop radiative corrections to the semileptonic decay of a charged particle at finite gauge boson mass. Extending the Bloch-Nordsieck cancellation of infrared logarithms, the subsequent non-analytic terms are also found to vanish after eliminating the pole mass in favor of a mass defined at short ...
1994-05-16
2009-10-28
[ "hep-ph" ]
M.Beneke, V.M.Braun and V.I.Zakharov
hep-ph/9405307
Signatures of discrete symmetries in the scalar sector
I discuss methods to identify the presence of dicrete symmetries in the two-Higgs-doublet model by observing the masses and the cubic and quartic interactions of the scalars. The symmetries considered are a $ Z_2 $ symmetry under which $ \phi_2 \rightarrow - \phi_2 $, and a CP symmetry which enforces real coupling cons...
1994-05-16
2010-11-01
[ "hep-ph" ]
L. Lavoura
hep-ph/9405306
Relativistic Quark-Antiquark Bound State Problem with Spin-dependent Interactions in Momentum Space
The work described in this paper is the first step toward a relativistic three-quark bound-state calculation using a Hamiltonian consistent with the Wigner-Bargmann theorem and macroscopic locality. We give an explicit demonstration that we can solve the two-body problem in momentum space with spin-dependent interactio...
1994-05-16
2010-03-04
[ "hep-ph", "nucl-th" ]
H.-C. Jean, D. Robson and A. G. Williams
hep-ph/9405301
Threshold Effects in Two--Photon Decays of Higgs Particles
The couplings of Higgs particles to two photons are analyzed in the threshold region, where the Higgs mass is about twice the loop--particle mass leading to possible bound state formation. The amplitude of the pseudoscalar decay $A\to \gamma\gamma$ for pseudoscalar masses in the range of $(t\bar t)$--bound state masses...
1994-05-16
2009-10-28
[ "hep-ph" ]
Kirill Melnikov, Michael Spira, Oleg Yakovlev
hep-ph/9405297
Pentaquark Exotic Baryons in the Skyrme Model
We investigate the pentaquark($P$) exotic baryons as soliton-antiflavored heavy mesons bound states in the limit of infinitely heavy meson mass. Our approach respects the chiral symmetry as well as the heavy quark symmetry. The results reveal a possibility for the loosely bound non-strange $P$-baryon(s).
1994-05-16
2009-10-28
[ "hep-ph" ]
Yongseok Oh, Byung-Yoon Park and Dong-Pil Min
hep-ph/9405298
Static Quantities of the W-Boson in the MSSM
We systematically analyze the anomalous dipole $\Delta k_{\gamma}$ and quadrupole $\Delta Q_{\gamma}$ moments of the W gauge bosons in the context of the minimal supersymmetric standard model as functions of the soft SUSY breaking parameters $A_0,m_0,M_{1/2}$ and the top quark mass. The severe constraints imposed by th...
1994-05-16
2009-09-25
[ "hep-ph" ]
A.B.Lahanas and V.C.Spanos
hep-ph/9405299
Two-Loop ${\cal O}(\alpha_sG_Fm_t^2)$ Corrections to the Fermionic Decay Rates of the Standard-Model Higgs Boson
Low- and intermediate mass Higgs bosons decay preferably into fermion pairs. The one-loop electroweak corrections to the respective decay rates are dominated by a flavour-independent term of ${\cal O}(G_Fm_t^2)$. We calculate the two-loop gluon correction to this term. It turns out that this correction screens the lead...
1994-05-16
2009-10-28
[ "hep-ph" ]
Bernd A. Kniehl
hep-ph/9405303
Pion Content of the Nucleon as seen in the NA51 Drell-Yan experiment
In a recent CERN Drell-Yan experiment the NA51 group found a strong asymmetry of $\bar u$ and $\bar d$ densities in the proton at $x\simeq0.18$. We interpret this result as a decisive confirmation of the pion-induced sea in the nucleon.
1994-05-16
2011-02-01
[ "hep-ph" ]
H. Holtmann, N.N. Nikolaev, J. Speth and A. Szczurek
hep-ph/9405296
Detecting Nutau Oscillations as PeV Energies
It is suggested that a large deep underocean neutrino detector, given the presence of significant numbers of neutrinos in the PeV range as predicted by various models of Active Galactic Nuclei, can make unique measurements of the properties of neutrinos. It will be possible to observe the existence of the nu_tau, measu...
1994-05-16
2010-11-01
[ "hep-ph", "astro-ph" ]
John G. Learned and Sandip Pakvasa (Department of Physics and Astronomy, Univerity of Hawaii)
hep-ph/9405295
The Transition to Perturbative QCD in Compton Scattering
We investigate the transition to perturbative QCD in Compton processes, by concentrating on the specific reactions $\pi \gamma \to \pi \gamma$ and pion photoproduction at moderate energy scales. New sum rules for each of the helicities involved in the scattering and the cross section are given, together with a detailed...
1994-05-16
2011-08-17
[ "hep-ph" ]
Claudio Coriano'(Argonne Natl. Lab.) and Hsiang-nan Li (Nat. Chung-Cheng Univ.)
hep-ph/9405294
Estimates of the O(alpha_s^4) corrections to sigma_{tot}(e^+e^- \rightarrow hadrons), Gamma(\tau\rightarrow \nu_{\tau} +hadrons) and deep inelastic scattering sum rules
We present the estimates of the order $O(\alpha^{4}_{s})$ QCD corrections to $R(s)$, $R_{\tau}$ and to the deep-inelastic scattering sum rules, namely to the non-polarized and polarized Bjorken sum rules and to the Gross-Llewellyn Smith sum rule. The estimates are obtained in the $\overline{MS}$-scheme using the princi...
1994-05-15
2008-02-03
[ "hep-ph" ]
A.L.Kataev and V.V.Starshenko
hep-ph/9405293
Neutrino Magnetic Moments and the Solar Neutrino Problem
Present status of the neutrino magnetic moment solutions of the solar neutrino problem is reviewed. In particular, we discuss a possibility of reconciling different degrees of suppression and time variation of the signal (or lack of such a variation) observed in different solar neutrino experiments. It is shown that th...
1994-05-15
2012-03-24
[ "hep-ph" ]
E.Kh. Akhmedov
hep-ph/9405289
The Convergence Radius of the Chiral Expansion in the Dyson-Schwinger Approach
We determine the convergence radius $m_{conv}$ for the expansion in the current quark mass using the Dyson-Schwinger (DS) equation of QCD in the rainbow approximation. Within a Gaussian form for the gluon propagator $D_{\mu\nu} ({\bf p}) \sim \delta_{\mu\nu} \chi^2 e^{- {{p^2} \over \Delta}}$ we find that $m_{conv}$ in...
1994-05-14
2009-10-28
[ "hep-ph", "nucl-th" ]
Th.Meissner
hep-ph/9405290
Next-to-Next-to-Leading Order QCD Analysis of DIS Structure Functions
It is performed for the first time a next-to-next-to-leading order analysis of deep inelastic structure functions $F_2$ and $F_L$ using the recently determined first moments of the non-singlet anomalous dimensions and the corresponding Wilson coefficients. {}From a comparison to BCDMS data we found a slight decrease in...
1994-05-14
2009-10-28
[ "hep-ph" ]
A.V. Kotikov, V.G. Krivokhizhin and G. Parente
hep-ph/9405291
Pseudo Dirac Neutrinos in Seesaw Model
Specific class of textures for the Dirac and Majorana mass matrices in the seesaw model leading to a pair of almost degenerate neutrinos is discussed. These textures can be obtained by imposing a horizontal $U(1)$ symmetry. A specific model is discussed in which: (1) All three neutrino masses are similar in magnitude a...
1994-05-13
2009-10-28
[ "hep-ph" ]
Gautam Dutta and Anjan S. Joshipura
hep-ph/9405282
Structure Functions and Small X Physics
We review recent developments in the determination of parton densities from deep inelastic and related data. We show how the asymmetries observed in the W+- rapidity distributions and in pp/pn Drell-Yan production further constrain the partons at moderate x. We compare the GLAP and BFKL descriptions of the recent measu...
1994-05-13
2009-09-25
[ "hep-ph" ]
A.D. Martin (Physics Department, Durham University, England)
hep-ph/9405292
Leptonic Flavor Violations in the Presence of an Extra Z
Gauged extensions [$SU(2)_L\otimes U(1)_Y\otimes U(1)_X$] of the standard $SU(2)_L\otimes U(1)_Y$ model obtained without extending the fermion content of the model are studied. Models that are possible when $U(1)_X$ is identified with some combination of the family lepton numbers are systematically classified. Most of ...
1994-05-13
2009-10-28
[ "hep-ph" ]
Gautam Dutta, K. B. Vijaykumar and Anjan S. Joshipura
hep-ph/9405285
Electroweak Dyons
We consider dyon configurations in the standard electroweak model. In the presence of a $\theta$ term and no fermions, the usual result $q = (n+\theta /2\pi ) e$ is obtained for the electric charge spectrum. The effect of including standard model fermions is discussed qualitatively.
1994-05-13
2009-10-28
[ "hep-ph", "hep-th" ]
Tanmay Vachaspati
hep-ph/9405284
The Form Factors of the Nucleons
We demonstrate that a relativistic constituent quark model can give nucleon form factors that agree well with recent, accurate measurements. The relativistic features of the model and the specific form of the wave function are essential for the result. (Talk given at 14th International Conference on Few-Body Problems i...
1994-05-13
2009-09-25
[ "hep-ph" ]
Felix Schlumpf
hep-ph/9405281
$\tau - \mu - e$ Universality in $\tau$ Decays and Constraints on the Slepton Masses
The leptonic $\tau$ decays are calculated at the 1-loop level in the Minimal Supersymmetric Standard Model. The deviation from the $\tau - \mu - e$ universality is studied as a function of the supersymmetric parameters and discussed in the context of the expected improvement of the experimental accuracy.
1994-05-13
2009-10-28
[ "hep-ph" ]
P.H. Chankowski, R. Hempfling and S. Pokorski
hep-ph/9405288
$\epsilon'/\epsilon$ And Anomalous Gauge Boson Couplings
We study $\epsilon'/\epsilon$ in the Standard Model and $\epsilon'/\epsilon$ due to anomalous $WW\gamma$ and $WWZ$ interactions %using recent result on the top quark mass from CDF. as a function of the top quark mass. In the Standard Model, $\epsilon'/\epsilon$ is in the range $10^{-3} \sim 10^{-4}$ for the central val...
1994-05-13
2010-11-01
[ "hep-ph" ]
Xiao-Gang He and B.H.J. McKellar
hep-ph/9405287
QCD sum rules vs. chiral perturbation theory
QCD sum rules are useful tools for studying the spectral properties of hadrons; however, assumptions underlying standard sum-rule analyses can lead to inconsistencies with known results of chiral perturbation theory. This possibility is demonstrated with QCD sum-rule extractions of the nucleon mass and $\sigma$ term. I...
1994-05-13
2009-10-28
[ "hep-ph" ]
David K. Griegel and Thomas D. Cohen
hep-ph/9405286
Electroweak Strings, Sphalerons and Magnetic Fields
We describe electroweak strings and their ability to carry Chern-Simons number. Certain string configurations, for any $\theta_W$, carry Chern-Simons number equal to that of the sphaleron and we conjecture that such strings are ``extended sphalerons''. The production of electroweak strings during the phase transition i...
1994-05-13
2007-05-23
[ "hep-ph" ]
Tanmay Vachaspati
hep-ph/9405283
Implications of the Top Quark Mass Measurements for the CKM Parameters, $\xs$ and CP Asymmetries
Motivated by the recent determination of the top quark mass by the CDF collaboration, $\mt =174 \pm 10 ^{+13}_{-12}$ GeV, we review and update constraints on the parameters of the quark flavour mixing matrix $V_{CKM}$ in the standard model. In performing these fits, we use inputs from the measurements of $\abseps$, the...
1994-05-13
2009-09-25
[ "hep-ph" ]
A. Ali and D. London
hep-ph/9405274
Parameter free calculation of non-resonant three body decays of charmed mesons in a weak gauged U(4)_L x U(4)_R Chiral Lagrangian Model
Non--resonant decays of charmed mesons into three pseudoscalars are analyzed in a weak gauged $U(4)_L \otimes U(4)_R$ chiral lagrangian model. The calculation is free of unknown parameters and only requires the masses of pseudoscalar mesons as hadronic inputs. When comparison with experimental data is possible we find ...
1994-05-12
2009-10-28
[ "hep-ph" ]
F.J. Botella (Valencia U.), S. Noguera (Valencia U.), J. Portoles (Durham U.)
hep-ph/9405271
Baryons with Many Colors and Flavors
Using recently-developed diagrammatic techniques, I derive some general results concerning baryons in the $1/N$ expansion, where $N$ is the number of QCD colors. I show that the spin-flavor relations which hold for baryons in the large-$N$ limit, as well as the form of the corrections to these relations at higher order...
1994-05-12
2009-10-28
[ "hep-ph", "hep-th" ]
Markus A. Luty
hep-ph/9405280
Testing CPT and Quantum Mechanics in the K_0-Kbar_0 System
I report a recent study done in collaboration with M.E. Peskin, on the time dependence of a kaon beam propagating according to a generalization of quantum mechanics due to Ellis, Hagelin, Nanopoulos and Srednicki, in which CP- and CPT-violating signatures arise from the evolution of pure states to mixed states. Constra...
1994-05-12
2009-09-25
[ "hep-ph" ]
Patrick Huet
hep-ph/9405278
String and string-inspired phenomenology
In these lectures I review the progress made over the last few years in the subject of string and string-inspired phenomenology. I take a practical approach, thereby concentrating more on explicit examples rather than on formal developments. Topics covered include: introduction to string theory, the free-fermionic form...
1994-05-12
2015-06-25
[ "hep-ph", "hep-th" ]
J. Lopez
hep-ph/9405279
Non-equilibrium evolution of the disoriented chiral condensate in heavy-ion collisions
We study the dynamics of the chiral phase transition expected during the expansion of the quark-gluon plasma produced in a high energy hadron or heavy ion collision in the $O(4)$ linear sigma model to leading order in a large $N$ expansion for strong coupling constants. Starting from an approximate equilibrium configur...
1994-05-12
2007-05-23
[ "hep-ph" ]
Yuval Kluger
hep-ph/9405277
Probing the Couplings of the Top Quark to Gauge Bosons
We parameterize the non-universal couplings of t-t-Z and t-b-W in the electroweak chiral lagrangian approach, and examine the constraints on these parameters from the LEP data. We also study how the SLC, Tevatron, LHC and NLC can improve the measurement of these couplings. Different symmetry breaking scenarios imply di...
1994-05-12
2009-10-28
[ "hep-ph" ]
Douglas O. Carlson, Ehab Malkawi and C.--P. Yuan
hep-ph/9405272
Baryon Magnetic Moments in a Simultaneous Expansion in $1/N$ and $m_s$
We consider the baryon octet and decuplet magnetic moments in a simultaneous expansion in $m_s$ and $1/N$ taking $N_F / N \sim 1$, where $N$ is the number of QCD colors and $N_F$ is the number of light quark flavors. At leading order in this expansion, the magnetic moments obey the non-relativistic quark-model relation...
1994-05-12
2009-09-25
[ "hep-ph", "hep-th" ]
Markus A. Luty, John March-Russell, and Martin White
hep-ph/9405275
When is a Higgs THE Higgs?
The one-Higgs-doublet standard model is necessarily incomplete because of the triviality of the scalar symmetry-breaking sector. If the Higgs mass is approximately 600 GeV or higher, there must be additional dynamics at a scale $\Lambda$ which is less than a few TeV. In this case the properties of the Higgs resonance c...
1994-05-12
2007-05-23
[ "hep-ph" ]
R. Sekhar Chivukula and Vassillis Koulovassilopoulos
hep-ph/9405276
CP-Like Symmetry, Family Replication, Charge Quantization
We propose that the physics beyond the standard Weinberg-Salam model is such that matter and the CP conjugate anti-matter fields have the same set of charges with respect to the various force groups (upto ordering). We show that this CP-like symmetry leads to an understanding of family replication. We use anomaly const...
1994-05-12
2007-05-23
[ "hep-ph" ]
Ravi Kuchimanchi
hep-ph/9405273
Constraints on the momentum dependence of rho-omega mixing
Within a broad class of models we show that the amplitude for rho^0-omega mixing must vanish at the transition from timelike to spacelike four momentum. Hence in such models the mixing is either zero everywhere or is necessarily momentum-dependent. This lends support to the conclusions of other studies of rho-omega mix...
1994-05-12
2008-11-26
[ "hep-ph", "nucl-th" ]
H.B. O'Connell, B.C. Pearce, A.W. Thomas and A.G. Williams
hep-ph/9405270
An Alternative Method of Extracting $V_{bu}$ from Semi-leptonic B Decay
We propose a new method of extracting $V_{bu}$ from measurements of Semi-leptonic B decay which has much less theoretical uncertainties than conventional methods.
1994-05-12
2010-11-01
[ "hep-ph" ]
Jin Dai (Department of Physics, Univ. of California, San Diego, CA)
hep-ph/9405267
Electric Quadrupole Moments of the Decuplet and the Strangeness Content of the Proton
In the SU3 Skyrme model the electric quadrupole moments of $\frac{3}{2}^+$ baryons show a strong sensitivity with respect to flavor distortions in baryon wavefunctions. SU3 symmetric wavefunctions lead to quadrupole moments proportional to the charge of the baryon whereas for strongly broken flavor symmetry a proportio...
1994-05-11
2008-11-26
[ "hep-ph" ]
J. Kroll and B. Schwesinger
hep-ph/9405263
Infrared Properties of the Hot Gauge Theory after Symmetry Breaking
It is shown that the fictitious infrared pole is eliminated from the hot gauge theory which acquires a new vacuum after the global gauge symmetry spontaneously breaking. The nonzero W-condensate is generated and leads to the screening of the chromomagnetic forces through the scenario with the standard magnetic mass.
1994-05-11
2010-11-01
[ "hep-ph" ]
O.K.Kalashnikov
hep-ph/9405264
Recalculation of W and Z radiative corrections and a top quark mass estimate
The newly published top mass prediction of 85.1 GeV conflicts with indirect limits on the top mass, based on precision measurements interpreted by calculations using dimensional regularization. The top quark contribution to part of the electroweak W and Z vacuum polarization tensor is recomputed using the symmetrical t...
1994-05-11
2008-02-03
[ "hep-ph" ]
J. J. Lodder and H. J. de Blank
hep-ph/9405265
Quantum-Electrodynamics without renormalization V. Bosonic contributions to the photon mass
The bosonic contributions to the photon mass are shown to be of the same form as the fermionic contributions, but of opposite sign. A mass sum rule for bosons and fermions follows from gauge invariance. Assuming completeness of the standard model the top quark mass can be predicted. Effectively only the W-bosons contri...
1994-05-11
2007-05-23
[ "hep-ph" ]
J. J. Lodder
hep-ph/9405269
On the Strength of First Order Phase Transitions
Electroweak baryogenesis may solve one of the most fundamental questions we can ask about the universe, that of the origin of matter. It has become clear in the past few years that it also poses a multi-faceted challenge. In order to compute the tiny primordial baryonic excess, we probably must invoke physics beyond th...
1994-05-11
2009-09-25
[ "hep-ph", "cond-mat" ]
Marcelo Gleiser
hep-ph/9405268
Cluster Growth in Two-Dimensional Quark-Hadron Phase Transition
The problem of hadronic cluster production in heavy-ion collisions is studied in search for an observable signature of first-order quark-hadron phase transition. The study is carried out by cellular automata in a two-dimensional model of the mixed phase at midrapidity. The clusters are allowed to grow as well as to coa...
1994-05-11
2009-09-25
[ "hep-ph" ]
Rudolph C. Hwa and Jicai Pan
hep-ph/9405266
Experimental Evidence for Electroweak Corrections Beyond Fermion Loops
We reemphasize the importance of discriminating fermion-loop and bosonic electroweak corrections in the analysis of electroweak precision data. Most recent data are indeed precise enough to require corrections beyond (trivial) fermion loops. An analysis of these data in terms of the observables $\Delta x \equiv \epsilo...
1994-05-11
2007-05-23
[ "hep-ph" ]
Dieter Schildknecht (University of Bielefeld, Department of Theoretical Physics)
hep-ph/9405262
Catalysis of Dynamical Flavor Symmetry Breaking by a Magnetic Field in $2+1$ Dimensions
It is shown that in $2+1$ dimensions, a constant magnetic field is a strong catalyst of dynamical flavor symmetry breaking, leading to generating a fermion dynamical mass even at the weakest attractive interaction between fermions. The effect is illustrated in the Nambu-Jona-Lasinio model in a magnetic field. The low-e...
1994-05-10
2009-10-28
[ "hep-ph", "hep-th" ]
V.P.Gusynin, V.A.Miransky, and I.A.Shovkovy
hep-ph/9405259
$\sin 2\beta$ from $K\to\pi\nu\bar\nu$
We point out that the measurement of just the two branching fractions \linebreak $B(K^+\to\pi^+\nu\bar\nu)$ and $B(K_L\to\pi^0\nu\bar\nu)$ can in a theoretically clean manner determine $\sin 2\beta$ almost independently of $m_t$ and $V_{cb}$. This allows to obtain an interesting relation between the CP asymmetry $A_{CP...
1994-05-10
2009-10-09
[ "hep-ph" ]
Gerhard Buchalla and Andrzej J. Buras
hep-ph/9405261
Spin Alignment in the Production of Vector Mesons with Charm and/or Beauty via Heavy Quark Fragmentation
We calculate the process-independent fragmentation functions for a $\bar b$ antiquark to fragment into longitudinally and transversely polarized $B_c^*$ ($^3S_1$) mesons to leading order in the QCD strong coupling constant. In the special case of equal quark mass we recover previous results for the fragmentation of $c\...
1994-05-10
2011-01-27
[ "hep-ph" ]
Kingman Cheung and Tzu Chiang Yuan
hep-ph/9405260
The Physics of the Chiral Fermions
We review the aspects of chiral gauge theories related to the violation of the decoupling property. The case of the top quark is worked out in detail. The mechanism of anomaly cancellation in the low-energy effective theory is illustrated in a simple model.
1994-05-10
2014-11-17
[ "hep-ph" ]
Ferruccio Feruglio
hep-ph/9405258
Monoslepton production in hadronic collisions
Single sparticle creation in high energy collisions as a consequence explicit $R$-parity breaking, could be a rich source of highly spectacular signals at future colliders. One particular process, which could lead to a highly exotic leptonic signal at the LHC, is monoslepton production. In this paper we qualitatively d...
1994-05-10
2007-05-23
[ "hep-ph" ]
J. McCurry
hep-ph/9405257
Weight optimization in multichannel Monte Carlo
We discuss the improvement in the accuracy of a Monte Carlo integration that can be obtained by optimization of the `a-priori weights' of the various channels. These channels may be either the strata in a stratified-sampling approach, or the several `approximate' distributions such as are used in event generators for p...
1994-05-10
2009-10-28
[ "hep-ph" ]
R.Kleiss and R.Pittau
hep-ph/9405255
Spin, Mass, and Symmetry
This is a broad-brush introduction to the theory of spin in quantum field theory, presented at the 1993 SLAC Summer Institute. It may be useful for beginning students.
1994-05-09
2007-05-23
[ "hep-ph" ]
Michael E. Peskin
hep-ph/9405253
Signals for Supersymmetry at HERA
We consider the baryon parity signals at HERA for the case of the MSSM production mechanisms and the decays via the lepton number violating couplings $L_iQ{\bar D}$. We can probe very small Yukawa couplings $\lam' \gsim 3\cdot 10^{-6}$, limited only by the decay length of the LSP. We assume the LSP to be the lightest n...
1994-05-09
2009-10-28
[ "hep-ph" ]
Herbi Dreiner and Peter Morawitz
hep-ph/9405250
Parton Distributions from W+- and Z Production in Polarized pp and pn Collisions at RHIC
We study the production of $W^{\pm}$ and $Z$ gauge bosons in proton-proton and proton-neutron collisions up to a center-of-mass energy $\sqrt s=0.5\ TeV$, in connection with the realistic possibility of having proton-deuteron collisions at RHIC with a high luminosity. We stress the importance of measuring unpolarized c...
1994-05-09
2019-08-17
[ "hep-ph" ]
Claude Bourrely, Jacques Soffer
hep-ph/9405251
Introduction to Strong Higgs Sector
A brief introduction to strong Higgs sector i.e. the possibility of breaking electroweak symmetry without an elementary Higgs is given. Constraints from present LEP data are studied and the discovery potential of future colliders investigated.
1994-05-09
2007-05-23
[ "hep-ph" ]
Pierre Chiappetta
hep-ph/9405254
The Gross--Llewellyn Smith Sum Rule: Theory vs Experiment
We describe the results of our recent work on the determination of the value of the parameter $\Lambda_{\overline{MS}}^{(4)}$ and of the $Q^2$-dependence of the Gross--Llewellyn Smith (GLS) sum rule from the experimental data of the CCFR collaboration on neutrino--nucleon deep-inelastic scattering, using the Jacobi pol...
1994-05-09
2009-09-25
[ "hep-ph" ]
Andrei L. Kataev and Aleksander V. Sidorov
hep-ph/9405256
Yukawa textures from an extra {\bf U(1)} symmetry?
The observed hierarchy of the quark and lepton masses and mixing angles has led to the parametrisation of the mass matrices in powers of the Cabibbo angle and a certain number of zeros. The origin of these ``textures'' may lie in symmetries present at the GUT/string unification scale. We discuss the case of an extra $U...
1994-05-09
2011-07-19
[ "hep-ph" ]
E. Papageorgiu
hep-ph/9405248
One-Loop Gauge Theory Amplitudes with an Arbitrary Number of External Legs
We review recent progress in calculations of one-loop QCD amplitudes. By imposing the consistency requirements of unitarity and correct behavior as the momenta of two legs become collinear, we construct ansatze for one-loop amplitudes with an arbitrary number of external legs. For supersymmetric amplitudes, which can b...
1994-05-09
2008-02-03
[ "hep-ph", "hep-th" ]
Z. Bern, L. Dixon, D. Dunbar, and D.A. Kosower
hep-ph/9405252
On the fine-tuning problem in minimal SO(10) SUSY-GUT
In grand unified theories (GUT) based on SO(10) all fermions of one generation are embedded in a single representation. As a result, the top quark, the bottom quark, and the $\tau$ lepton have a universal Yukawa coupling at the GUT scale. This implies a very large ratio of Higgs vacuum expectation values, $\tanb \simeq...
1994-05-09
2011-07-19
[ "hep-ph" ]
Ralf Hempfling
hep-ph/9405243
Gluon Radiation and Energy Losses in Top Quark Production
The emission of energetic gluons in $\tt$ production in $\ee$ annihilation can have important experimental consequences, in particular on top quark mass measurements. We present compact, analytical expressions for the gluon energy distribution and its average value at first order in QCD perturbation theory. Our results...
1994-05-06
2014-11-17
[ "hep-ph" ]
Yu.L. Dokshitzer, V.A. Khoze and W.J. Stirling
hep-ph/9405249
On a Possible Explanation of the Origin of the Quark Mass Spectrum
Contrary to the usual case when the quark mass spectrum is defined by that of the quark Yukawa couplings while the vacuum expectation value of the Higgs field remains universal, we suggest to consider the opposite situation. Each generation of quarks and leptons is associated with its own Higgs doublet, while the Yukaw...
1994-05-06
2007-05-23
[ "hep-ph" ]
D.I.Kazakov
hep-ph/9405247
Approximate flavor symmetries
We discuss the idea of approximate flavor symmetries. Relations between approximate flavor symmetries and natural flavor conservation and democracy models is explored. Implications for neutrino physics are also discussed.
1994-05-06
2007-05-23
[ "hep-ph" ]
Andrija Ra\v{s}in
hep-ph/9405241
J/psi Production via Fragmentation at the Tevatron
The production of $\jpsi$ at large transverse momenta ($\pt > M_\jpsi$) in $p\bar p$ collisions is considered by including the mechanism of fragmentation. Both contributions of fragmentation to $\jpsi$ and of fragmentation to $\chi$ states followed by radiative decay to $\jpsi$ are taken into account. The latter is fou...
1994-05-06
2009-10-28
[ "hep-ph" ]
M. Cacciari and M. Greco
hep-ph/9405244
Disoriented Chiral Condensates
The idea that a bubble of misaligned vacuum is sometimes produced in high-energy collisions is reviewed.
1994-05-06
2007-05-23
[ "hep-ph" ]
Andre Krzywicki, LPTHE Orsay
hep-ph/9405242
Test of $CP$ Violating Neutral Gauge Boson Vertices in $ e^+ e^- \rightarrow \gamma Z $
Forward-backward asymmetry in the process $e^+ e^- \rightarrow \gamma Z$ is proposed as a test for $CP$--violating anomalous $\gamma \gamma Z$ and $ \gamma Z Z$ couplings. Longitudinally polarized electron beams may be used to disentangle the effects of these couplings. We estimate possible limits that can be obtained ...
1994-05-06
2010-11-01
[ "hep-ph" ]
Debajyoti Choudhury and Saurabh D. Rindani
hep-ph/9405239
Testing the Principle of Equivalence by Solar Neutrinos
We discuss the possibility of testing the principle of equivalence with solar neutrinos. If there exists a violation of the equivalence principle quarks and leptons with different flavors may not universally couple with gravity. The method we discuss employs a quantum mechanical phenomenon of neutrino oscillation to pr...
1994-05-06
2009-10-28
[ "hep-ph" ]
Hisakazu Minakata and Hiroshi Nunokawa
hep-ph/9405246
Theory of Pre-Asymptotic Effects in Weak Inclusive Decays
I give an introduction to the theory of preasymptotic effects based on the systematic OPE/HQET expansion in $1/m_Q$ where $m_Q$ is the heavy quark mass. The general idea is explained in two most instructive examples, with an emphasis on pedagogical aspects. Some important results of the last year are reviewed. In discu...
1994-05-06
2009-09-25
[ "hep-ph", "hep-th" ]
M.A. Shifman
hep-ph/9405240
Gauge Structure and Semi-Classical Aspects of Hard Thermal Loops
Hard thermal loops play a central role in the theory of long wavelength excitations of a quark-gluon plasma. We show in this paper how our recent derivation of their generating functional from the Dyson-Schwinger equations sheds light on their semi-classical nature and their remarkable gauge structure. In particular, w...
1994-05-06
2010-11-01
[ "hep-ph" ]
Jean-Paul Blaizot and Edmond Iancu
hep-ph/9405245
Multilepton SUSY signals from R-parity violation at the Tevatron
The expected trilepton signals from $p \bar p \to \chi^\pm_1\chi^0_2 \to (\chi^0_1\ell^\pm\nu) (\chi^0_1\ell'^+\ell'^-) $ will be converted into hadronically quiet multilepton signals, if the two final $\chi^0_1$ have leptonic $R$-parity-violating (RPV) decays $\chi^0_1 \to \ell \ell' \nu$. We make illustrative calcula...
1994-05-06
2009-09-25
[ "hep-ph" ]
V.Barger, M.S.Berger, P.Ohmann and R.J.N.Phillips
hep-ph/9405227
Stretching Wiggly Strings
How does the amplitude of a wiggle on a string change when the string is stretched? We answer this question for both longitudinal and transverse wiggles and for arbitrary equation of state, {\it i.e.}, for arbitrary relation between the tension $\tau$ and the energy per unit length $\epsilon$ of the string. This comple...
1994-05-05
2009-10-28
[ "hep-ph", "astro-ph", "hep-th" ]
Jaewan Kim and Pierre Sikivie
hep-ph/9405231
Feasibility of Beauty Baryon Polarization Measurement in Lambda0 J/psi Decay Channel by Atlas-LHC
The possibility of beauty baryon polarization measurement by cascade decay angular distribution analysis in the channel Lambda0 J/psi --> p pi- l+ l- is demonstrated. The error analysis shows that in the proposed LHC experiment ATLAS at the luminosity $10^{4} pb^{-1}$ the polarization can be measured with the statistic...
1994-05-05
2009-10-28
[ "hep-ph" ]
J.Hrivnac, R.Lednicky and M.Smizanska
hep-ph/9405236
QCD and Intrinsic Heavy Quark Predictions for Leading Charm and Beauty Hadroproduction
Recent experiments at Fermilab and CERN have observed a strong asymmetry between the hadroproduction cross sections of leading $D$ mesons, containing projectile valence quarks, and nonleading charmed mesons, without projectile valence quarks. The observed correlations of the $\pi^{\pm} N \to D^\pm X$ cross section with...
1994-05-05
2009-09-25
[ "hep-ph", "nucl-th" ]
R. Vogt and S. J. Brodsky
hep-ph/9405233
Soft supersymmetry breaking and finiteness
We calculate the two-loop $\beta$-functions for soft supersymmetry-breaking interactions in a general supersymmetric gauge theory, emphasising the role of the evanescent couplings and masses that are generic to a non-supersymmetric theory. We also show that a simple set of conditions sufficient for one-loop finiteness ...
1994-05-05
2011-07-19
[ "hep-ph" ]
I. Jack and D. R. T. Jones
hep-ph/9405229
Conformal Properties of Chern-Simons Vortices in External Fields
The construction and the symmetries of Chern-Simons vortices in harmonic and uniform magnetic force backgrounds found by Ezawa, Hotta and Iwazaki, and by Jackiw and Pi are generalized using the non-relativistic Kaluza-Klein-type framework presented in our previous paper. All Schrodinger-symmetric backgrounds are determ...
1994-05-05
2019-08-17
[ "hep-ph" ]
C. Duval, P.A. Horvathy, L. Palla
hep-ph/9405230
Atomic Alchemy
We consider the transitions between electromagnetic bound states, such as the exclusive weak decay of a muonic atom into an electronic atom: $(\mu^- Z) \to (e^- Z) {\bar \nu_e }\nu_\mu . $ We show that relativistic effects in the atomic wavefunctions are crucial for determining the rate. In the case of heavy atoms, the...
1994-05-05
2009-09-25
[ "hep-ph" ]
C. Greub, D. Wyler, S. Brodsky and C. Munger
hep-ph/9405228
On the $G_2$ Manifestation for Longitudinally Polarized
The contribution of the $G_2$ structure function to polarized deep inelastic scattering is slightly redefined in order to avoid kinematical zeros. Its strong $Q^2$-dependence implied by the Burkhardt-Cottingham (BC) sum rule naturally explains the sign change of the generalized Gerasimov-Drell-Hearn (GDH) sum rule. The...
1994-05-05
2009-12-30
[ "hep-ph" ]
Soffer and O.V.Teryaev
hep-ph/9405237
Non-Perturbative QCD Treatment of High-Energy Hadron-Hadron Scattering
Total cross-sections and logarithmic slopes of the elastic scattering cross-sections for different hadronic processes are calculated in the framework of the model of the stochastic vacuum. The relevant parameters of this model, a correlation length and the gluon condensate, are determined from scattering data, and foun...
1994-05-05
2009-09-25
[ "hep-ph" ]
H.G. Dosch, Erasmo Ferreira, A. Kr\"amer
hep-ph/9405234
The Electroweak Phase Transition at $m_H \simeq m_W$
We study the finite temperature electroweak transition with non-perturbative lattice Monte Carlo simulations. We find that it is of first order, at least for Higgs masses up to 80 GeV. The critical temperature of the phase transition is found to be smaller than that determined by a 2-loop renormalization group improved...
1994-05-05
2009-10-28
[ "hep-ph" ]
K. Farakos, K. Kajantie, K. Rummukainen and M. Shaposhnikov
hep-ph/9405235
Chasing the light-gluino scenario through $b\rightarrow s \gamma$
We investigate the impact of a light gluino, which might have escaped detection at colliders, on inclusive radiative $B$-decays mediated through penguin-like diagrams. We find that the viability of the scenario depends largely on the magnitude of the flavour-violating $c$-parameter. Some previously allowed regions of p...
1994-05-05
2009-10-28
[ "hep-ph" ]
Gautam Bhattacharyya and Amitava Raychaudhuri
hep-ph/9405238
Distinguishing Among Strong Decay Models
Two competing models for strong hadronic decays, the $^3P_0$ and $^3S_1$ models, are currently in use. Attempts to rule out one or the other have been hindered by a poor understanding of final state interactions and by ambiguities in the treatment of relativistic effects. In this article we study meson decays in bo...
1994-05-05
2009-10-28
[ "hep-ph" ]
P. Geiger and E.S. Swanson
hep-ph/9405232
Photon Interferometry of Quark-Gluon Dynamics Revisited
The Bose-Einstein correlations of photons emitted {}from a longitudinally expanding system of excited matter produced in ultrarelativistic heavy ion collision are studied. Two effects found in recent calculations -- that the correlation function in longitudinal direction exhibits oscillations, and that it takes values ...
1994-05-05
2009-09-25
[ "hep-ph" ]
A.Timmermann, M.Pluemer, L.V.Razumov and R.M. Weiner
hep-ph/9405226
Form Factors for $B\to\pi$ and $D\to\pi$ Transitions
Armed with the information on the form factor $\fdpi(0)$ inferred from recent CLEO measurements of SU(3)-breaking effects in charmed meson decays, we have studied the form factor $\fbpi$. In the heavy quark limit, $\fbpi(q^2)$ is related to $\fdpi(q^2)$ in the kinematic region close to zero recoil. Assuming pole domina...
1994-05-05
2007-05-23
[ "hep-ph" ]
Hai-Yang Cheng
hep-ph/9405217
Using Heavy Quark Fragmentation into Heavy Hadrons to Determine QCD Parameters and Test Heavy Quark Symmetry
We present a detailed analysis of the use of heavy quark fragmentation into heavy hadrons for testing the heavy quark effective theory through comparison of the measured fragmentation parameters of the $c$ and $b$ quarks. Our analysis is entirely model independent. We interpret the known perturbative evolution in a way...
1994-05-04
2009-09-25
[ "hep-ph" ]
L. Randall and N. Rius
hep-ph/9405223
Hierarchical Supersymmetry Breaking in Superstring Derived Standard--like Models
We examine the problem of supersymmetry breaking in realistic superstring standard--like models which are constructed in the free fermionic formulation. We impose a supersymmetric vacuum at the Planck scale by requiring vanishing F and D constraints at the cubic level of the superpotential. We then study possible scena...
1994-05-04
2011-07-19
[ "hep-ph", "hep-th" ]
Alon E. Faraggi and Edi Halyo
hep-ph/9405222
Interactions between $U(1)$ Cosmic Strings: An Analytical Study
We derive analytic expressions for the interaction energy between two general $U(1)$ cosmic strings as the function of their relative orientation and the ratio of the coupling constants in the model. The results are relevant to the statistic description of strings away from critical coupling and shed some light on the ...
1994-05-04
2009-10-28
[ "hep-ph" ]
L. M. A. Bettencourt and R. J. Rivers
hep-ph/9405221
Non Intercommuting Configurations in the Collisions of Type-I $U(1)$ Cosmic Strings
It is shown that for small relative angle and kinetic energy two type I $U(1)$ strings can form bound states upon collision instead of the more familiar intercommuting configuration. The velocity below which this may happen is estimated as function of the ratio of the coupling constants in the theory, crossing angle an...
1994-05-04
2009-10-28
[ "hep-ph" ]
L. M. A. Bettencourt and T. W. B. Kibble
hep-ph/9405219
Electroweak corrections to the $H\to t\bar{t}$ decay rate
The electroweak corrections at one-loop level to the process $H\rightarrow t{\bar t}$ are calculated, especially the fresh top mass value announced recently by CDF is concerned. For $M_H < 1. TeV$ where a perturbative calculation is valid, the corrections themselves would gain a few to 20 percent increment in the decay...
1994-05-04
2015-06-25
[ "hep-ph" ]
Xiao-Xi Chen, Wen-Gan Ma, Yao-Yang Liu, La-Zhen Sun and Chao-Hsi Chang
hep-ph/9405220
Dynamical Stability of Witten Rings
The dynamical stability of cosmic rings, or vortons, is investigated for the particular equation of state given by the Witten bosonic model. It is found that there exists a finite range of the state parameter for which the vorton states are actually stable against dynamical perturbations. Inclusion of the electromagnet...
1994-05-04
2009-10-28
[ "hep-ph" ]
X. Martin and P. Peter
hep-ph/9405224
Singlet quarks beyond the top at the Tevatron?
The first evidence for the top quark at the Tevatron may indicate a cross section higher than the QCD expectation. We consider the possibility that isosinglet heavy quarks may be contributing to the signal and discuss ways of testing this possibility. For example, a charge $\case2/3$ singlet quark, approximately degene...
1994-05-04
2009-09-15
[ "hep-ph" ]
V.Barger and R.J.N.Phillips
hep-ph/9405225
Critical Bubbles and Fluctuations at the Electroweak Phase Transition
We discuss the critical bubbles of the electroweak phase transition using an effective high-temperature 3-dimensional action for the Higgs field $\varphi$. The separate integration of gauge and Goldstone boson degrees of freedom is conveniently described in the 't Hooft-Feynman covariant background gauge. The effective...
1994-05-04
2009-10-28
[ "hep-ph" ]
J.Kripfganz, A.Laser and M.G.Schmidt
hep-ph/9405216
Bounding the Tau Neutrino Magnetic Moment from Single Photon Searches at LEP
We show that single photon searches at LEP constrain the tau neutrino magnetic moment to be less than ${\cal O}(10^{-6})~\mu_B$. This bound is competitive with low energy ($s\simeq (30~GeV)^2$) single photon searches.
1994-05-04
2008-11-26
[ "hep-ph" ]
Thomas M. Gould and I.Z Rothstein
hep-ph/9405218
Commensurate Scale Relations in Quantum Chromodynamics
We use the BLM method to show that perturbatively-calculable observables in QCD can be related to each other without renormalization scale or scheme ambiguity. We define and study the commensurate scale relations. We show that the commensurate scales satisfy the renormalization group transitivity rule which ensures tha...
1994-05-04
2009-09-25
[ "hep-ph" ]
Stanley J. Brodsky and Hung Jung Lu
hep-ph/9405209
Dominance of the light-quark condensate in the heavy-to-light exclusive decays
Using the QCD {\it hybrid} (moments-Laplace) sum rule, we show $semi$-$analytically$ that, in the limit $M_b \rar \infty$, the $q^2$ and $M_b$ behaviours of the heavy-to-light exclusive ($\bar B\rar \rho~(\pi)$ semileptonic as well as the $ B\rar \rho\gamma$ rare) decay--form factors are $universally$ dominated by the ...
1994-05-03
2009-10-28
[ "hep-ph" ]
S. Narison
hep-ph/9405208
$A_0$ condensate in QCD
A survey devoted to $A_0$-condensate in gauge theories at high temperature is presented. Both the theoretical foundations of the spontaneously generated condensate and known methods of its calculation are discussed. As most important consequence the SU(N) global symmetry breakdown is investigated in details. Influence ...
1994-05-03
2010-11-01
[ "hep-ph" ]
O.A.Borisenko, J.Boh\`a\v{c}ik, V.V.Skalozub
hep-ph/9405212
Electron-Electron Scattering as a Probe of Anomalous Gauge Couplings
The effect of anomalous gauge couplings on polarized $e^- e^-$ scattering cross sections is examined. It turns out that different combinations of beam polarizations provide constraints that are complementary to each other and to those obtained from other experiments, such as $e^+ e^-$, $e^- \gamma$ and $\gamma \gamma$ ...
1994-05-03
2009-10-28
[ "hep-ph" ]
Debajyoti Choudhury and Frank Cuypers
hep-ph/9405211
The Three-Jet Rate in \(e^{+}e^{-}\) Annihilation
Progress has been made on the calculation of \(R_{3}\), the three-jet rate in \(e^{+}e^{-}\) annihilation, in the \(k_\bot \) (Durham) scheme. Using the coherent branching formalism \cite{b,c,d}, an explicit expression for \(R_{3}\) is calculated. In this, leading and next-to-leading large logarithms (LL and NLL) are r...
1994-05-03
2009-10-28
[ "hep-ph" ]
C.N.Lovett-Turner (Centre for Particle Theory, University of Durham, South Road, Durham, DH1 3LE, England)
hep-ph/9405214
Patterns of Deviation from the Standard Model
Effective Lagrangians can be used to parametrize the effects of physics beyond the standard model. Assuming the complete theory is a gauge theory, we determine which effective operators may be generated at tree level, and which are only generated at loop level. The latter are be suppressed by factors of $1/ 16\pi^2$ an...
1994-05-03
2009-10-28
[ "hep-ph" ]
C. Arzt, M.B. Einhorn, and J. Wudka
hep-ph/9405215
Protecting the Baryon Asymmetry with Thermal Masses
We consider the evolution of baryon number $B$ in the early universe under the influence of rapid sphaleron interactions and show that $B$ will remain nonzero at all times even in the case of $B-L = 0$. This result arises due to thermal Yukawa interactions that cause nonidentical dispersion relations (thermal masses) f...
1994-05-03
2009-09-15
[ "hep-ph" ]
S. Davidson, K. Kainulainen and K.A. Olive
hep-ph/9405210
Minijets at Small x
Nonperturbative pomeron exchange at high energy includes minijet production. At moderate $Q^2$ it is responsible for the small-$x$ behaviour of $\nu W_2$. Hence minijet production should be a feature of deep inelastic scattering at small $x$.
1994-05-03
2007-05-23
[ "hep-ph" ]
P V Landshoff