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hep-ph/9310292
Precision Data Parameters and Grand Unification Predictions
When realizing the Minimal Supersymmetric Standard Model (MSSM) within a (simple) Grand Unified Theory (GUT), the predicted ranges for the strong coupling and the ratio of two Higgs doublet expectation values are strongly correlated with the weak angle and the $t$-quark mass. (The latter are extracted from precision da...
1993-10-15
2009-09-25
[ "hep-ph" ]
Nir Polonsky
hep-ph/9310289
The Search for a Light `Intermediate Mass' Higgs Boson
We review recent progress in techniques for searching for the Standard Model light `Intermediate Mass' Higgs Boson ($80 \GeV \lsim M_H \lsim 140\GeV$). We pay particular attention to associated production at the SSC and LHC where we search for the Higgs produced in association with either a $W$ boson or a $t$ quark. Th...
1993-10-14
2007-05-23
[ "hep-ph" ]
David J. Summers
hep-ph/9310290
Detecting Technibaryon Dark Matter
The technibaryon constitutes a possible dark matter candidate. Such a particle with electroweak quantum numbers is already nearly ruled out as the dominant component of the galactic dark matter by nuclear recoil experiments. Here, the scattering of singlet technibaryons, without electroweak quantum numbers, is consider...
1993-10-14
2009-10-22
[ "hep-ph", "astro-ph" ]
John Bagnasco, Michael Dine, and Scott Thomas
hep-ph/9310284
Influence of the Landau-Pomeranchuk Effect on Lepton-Pair Production
An estimate is made of the Landau-Pomeranchuk effect on the production of dileptons in a hadronic gas and in a quark-gluon plasma. For low mass dilepton pairs this effect reduces the production rate for bremsstrahlung by an order of magnitude. For high invariant masses its influence is negligible. This behaviour is of ...
1993-10-14
2009-10-22
[ "hep-ph" ]
J. Cleymans, V.V. Goloviznin and K. Redlich
hep-ph/9310283
The Greening of Quantum Field Theory: George and I
This is a lecture given July 14, 1993, at Nottingham.
1993-10-14
2007-05-23
[ "hep-ph" ]
Julian Schwinger (University of California, Los Angeles)
hep-ph/9310285
Weak Annihilation and the Endpoint Spectrum in Semileptonic B Decays
A general relationship is formulated between the contributions of `Weak Annihilation' (WA) to inclusive semileptonic decays of heavy flavour hadrons and the matrix elements of four fermion operators. We argue that nonperturbative contributions from low energy hadronic final states provide the dominant impact of WA on t...
1993-10-14
2009-10-22
[ "hep-ph" ]
I.I.Bigi and N.G.Uraltsev
hep-ph/9310288
Astrophysical Bounds on Milli-Charged Particles in Models with a Paraphoton
The upper bound on the number of relativistic species present at nucleosynthesis has been used to constrain particles with electric charge $\epsilon e$ ($10^{-8} < \epsilon <1$). We correct the bound previously calculated for milli-charged particles that interact with a shadow photon. We also discuss the additional con...
1993-10-14
2009-10-22
[ "hep-ph" ]
Sacha Davidson and Michael Peskin
hep-ph/9310287
Signatures for Hybrids
In this review talk I summarize theoretical expectations for properties of hybrid mesons and baryons, and discuss the prospects for identifying these states experimentally. This is an expanded version of an Invited Contribution to the Conference on Exclusive Reactions at High Momentum Transfers, Marciana Marina, Elba, ...
1993-10-14
2007-05-23
[ "hep-ph" ]
T.Barnes
hep-ph/9310286
The Decay Rate Asymmetry of the Top Quark
The asymmetries ${\cal A}_k \equiv [\Gamma(\twddec) -\Gamma(\tbwddec)] /[\Gamma(\twddec) + \Gamma(\tbwddec)]$ in the partial widths of the top quark decays are discussed within the Standard Model (SM), the Two-Higgs-Doublet Model (2HDM) and supersymmetric extensions of the SM (SSM). The leading contributions to these a...
1993-10-14
2009-09-01
[ "hep-ph" ]
B. Grzadkowski and W.-Y. Keung
hep-ph/9310282
Poking at the Correspondence Principle with Derivative Couplings
It is shown that quantum mechanical systems obtained from a heuristic path integral quantization of lagrangians of the form $ L= \sum_{n} \frac{1}{n!} f_n(q) \dot{q}^n $ violate in general the correspondence principle, unless $L$ is not more than quadratic in $\dot{q}$. The field theoretic counterpart of this result an...
1993-10-13
2016-09-01
[ "hep-ph" ]
G. Moultaka
hep-ph/9310275
A W--dressed Electroweak String
We give plausibility arguments for the existence of a $W$--dressed electroweak string for the \ws ~model with $\th_W = 0$. This string is a $Z$--string which in the core has a finite energy contribution from $W$--condensation induced by the anomalous magnetic moment in the \ym field. The solution which has minimum ener...
1993-10-13
2007-05-23
[ "hep-ph" ]
P. Olesen
hep-ph/9310279
Color Exchange in Near-forward Hard Elastic Ecattering
We study the large-$t$ small angle behavior of quark-quark elastic scattering. We employ a factorization procedure previously developed for fixed angle scattering, which depends on the color structure of the factorized hard subprocess. We find an evolution in $t$ that (in leading logarithmic approximation) becomes diag...
1993-10-13
2014-11-17
[ "hep-ph" ]
Michael Sotiropoulos and George Sterman
hep-ph/9310271
Hyperon-Nucleon Interaction in a Quark Model
A lecture given at the International School Seminar on {\sl Hadrons and Nuclei from QCD}, Tsuruga-Vladivostok-Sapporo, August-September, 1993. A realistic hyperon ($Y$)-nucleon ($N$) interaction based on the quark model and the one-boson-exchange potential is constructed. The Nijmegen potential model D with the SU(3)...
1993-10-13
2007-05-23
[ "hep-ph", "nucl-th" ]
Makoto Oka (Dept. of Phys., Tokyo Institute of Technology, Oh-Okayama, Tokyo)
hep-ph/9310276
Does the W Mass Reconstruction Survive QCD Effects?
In the hadronic decay mode of a pair of W bosons, $\text{e}~+\text{e}~- \to \text{W}~+ \text{W}~- \to \text{q}_1 \overline{\text{q}}_2 \text{q}_3 \overline{\text{q}}_4$, QCD interference effects can mix up the two colour singlets $\text{q}_1 \overline{\text{q}}_2$ and $\text{q}_3 \overline{\text{q}}_4$, i.e. produce ha...
1993-10-13
2011-02-15
[ "hep-ph" ]
Torbj\"orn Sj\"ostrand, Valery A. Khoze
hep-ph/9310281
QCD Corrections to Higgs Boson Production: Non- Leading Terms in the Heavy Quark Limit
We compute analytic results for the QCD corrections to Higgs boson production via gluon fusion in hadronic collisions in the limit in which the top quark is much heavier than the Higgs boson. The first non-leading corrections of $\O(\alpha_s^3 \mh^2/m_t^2)$ are given and numerical results presented for both LHC and SSC...
1993-10-13
2009-10-22
[ "hep-ph" ]
S. Dawson and R. Kauffman (BNL)
hep-ph/9310280
The Tau Neutrino as the Lightest Supersymmetric Particle
Given the conservation of baryon number as well as electron and muon numbers, all present data can be explained without the need of a conserved quantum number for the tau lepton and its neutrino. A supersymmetric extension of the standard model naturally allows for such a scenario. One consequence is that the tau neutr...
1993-10-13
2007-05-23
[ "hep-ph" ]
Ernest Ma
hep-ph/9310278
Effective Lagrangian with vector mesons : Linear response theory
The soliton breathing mode is investigated in the framework of linear response theory within a Skyrme model vector meson stabilized. The effective Lagrangian considered includes the $\rho$ (introduced following the standard prescription of nonlinear chiral symmetry) and the $\omega$ mesons. The monopole response functi...
1993-10-13
2009-10-22
[ "hep-ph" ]
Abdellatif Abada
hep-ph/9310277
Discovering Supersymmetry with Electron and Photon Beams
Linear collider designs are optimized for \ep\ collisions. However, from the physics point of view, \lc s may also be advantageously operated in an \ee, \eg\ or \pp\ mode. These options, which have not been available up to now, will provide unique tests of the \sm\ and of physics beyond it. As an example, we review the...
1993-10-13
2007-05-23
[ "hep-ph" ]
Frank Cuypers, Geert Jan van Oldenborgh, Reinhold R\"uckl
hep-ph/9310272
Spin Structure Functions
We review the theory and phenomenology of deep inelastic polarized lepton-nucleon scattering in the light of recent data with a deuteron target from the SMC at CERN and a Helium 3 target from the E142 experiment at SLAC. After including higher-order perturbative QCD corrections, mass corrections and updated estimates o...
1993-10-12
2008-02-03
[ "hep-ph" ]
John Ellis and Marek Karliner
hep-ph/9310273
Effects of $e^- e^+ \nu_e$ Decays of Tau Neutrinos Near A Supernova
We revisit the constraints implied by SN 1987 A observations on the decay rate of a multi-MeV $\nu_\tau$ decaying into the visible channel $\nu_\tau \rightarrow e^+ e^- \nu_e$, if its lifetime is more than 10 {\it sec.}. We discuss its implication for the minimal left-right symmetric model with see-saw mechanism for ne...
1993-10-12
2009-10-22
[ "hep-ph" ]
R.N. Mohapatra, S. Nussinov and X. Zhang
hep-ph/9310268
Cosmological Baryon Asymmetry in Supersymmetric Standard Models and Heavy Particle Effects
Cosmological baryon asymmetry B is studied in supersymmetric standard models, assuming the electroweak reprocessing of B and L. Only when the soft supersymmetry breaking is taken into account, B is proportional to the primordial B-L in the supersymmetric standard models. The ratio $B/(B-L)$ is found to be about one per...
1993-10-12
2009-10-22
[ "hep-ph" ]
T. Inui, T. Ichihara, Y. Mimura and N. Sakai
hep-ph/9310269
Comment on ``Neutrino masses and mixing angles in a predictive theory of fermion masses''
In the extension of the Dimopoulos--Hall--Raby model of the fermion mass matrices to the neutrino sector, there is an entry in the up-quark and neutrino Dirac mass matrices which can be assumed to arise from the Yukawa coupling of a {\bf 120}, instead of a {\bf 10} or a {\bf 126}, of SO(10). Although this assumption le...
1993-10-12
2009-10-22
[ "hep-ph" ]
L. Lavoura and Jo\~ao P. Silva (Carnegie-Mellon University)
hep-ph/9310270
Pseudoscalar Mass Effects in Decays of Taus with Three Pseudoscalar Mesons
We study the effects of non-vanishing pseudoscalar masses in $\tau$ decays into three mesons. The hadronic matrix elements are obtained by using the generalized structure of the chiral currents with nonvanishing pseudoscalar masses and implementing the low-lying resonances in the different channels. We demonstrate that...
1993-10-12
2009-10-22
[ "hep-ph" ]
Roger Decker, Markus Finkemeier and Erwin Mirkes
hep-ph/9310274
Spontaneous CP Violation and Natural Flavor Conservation In the $SU(2)_{L}\times U(1)_{Y}$ Gauge Theory with Two Higgs Doublets
The two principles of spontaneous CP violation and natural flavor conservation can be realized in the $SU(2)_{L}\times U(1)_{Y}$ model with two Higgs doublets. In particular, this model provides a consistent application to the CP violating parameters $\epsilon$ and $\epsilon'/\epsilon$ in kaon decay and the neutron ele...
1993-10-12
2007-05-23
[ "hep-ph" ]
Yue-Liang Wu
hep-ph/9310266
Diquark Corrleations in the nucleon structure function
The nucleon structure functions are studied with a special emphasis on diquark correlations inside the nucleon. Assuming a phenomenological diquark-quark model of the nucleon at the low energy hadronic scale, we calculate the leading twist contributions to the nucleon structure functions. We take the Nambu and Jona-Las...
1993-10-12
2015-06-25
[ "hep-ph" ]
K. Suzuki, T. Shigetani and H. Toki
hep-ph/9310267
The Effective Potential of Electroweak Theory with Two Massless Higgs Doublets at Finite Temperature
The effective potential of electroweak theory with two massless Higgs doublets at finite temperature is studied. We investigate phase structure and critical temperature in this model by numerical analysis without high-temperature expansion. The phase transition is found to be of first order. The critical temperature is...
1993-10-12
2017-02-01
[ "hep-ph" ]
K. Funakubo, A. Kakuto and K. Takenaga
hep-ph/9310262
SO(10) Cosmic Strings and SU(3) Color Cheshire Charge
Certain cosmic strings that occur in GUT models such as $SO(10)$ can carry a magnetic flux which acts nontrivially on objects carrying $SU(3)_{color}$ quantum numbers. We show that such strings are non-Abelian Alice strings carrying nonlocalizable colored ``Cheshire" charge. We examine claims made in the literature tha...
1993-10-11
2009-10-22
[ "hep-ph", "hep-th" ]
M. Bucher and A.S. Goldhaber
hep-ph/9310258
Void Analysis and Hierarchical Structure for Single Jets
After a brief review of the theoretical basis of void scaling function properties of hierarchical structure, we analyze the phenomenological consequences at single jet level in Monte Carlo e+e- annihilation events. We find an interesting alternative approach for characterizing quark and gluon jets.
1993-10-11
2009-09-25
[ "hep-ph" ]
R. Ugoccioni, A. Giovannini and S. Lupia
hep-ph/9310263
On the Determination of the $b \rightarrow c$ Handedness Using Nonleptonic $\Lambda_c$-Decays
We consider possibilities to determine the handedness of $b \ra c$ current transitions using semileptonic baryonic $\Lambda_{b} \rightarrow \Lambda_{c}$ transitions. We propose to analyze the longitudinal polarization of the daughter baryon $\Lambda_c$ by using momentum-spin correlation measurements in the form of forw...
1993-10-11
2009-10-22
[ "hep-ph" ]
B.Konig, J.G.Korner, M.Kramer
hep-ph/9310261
Properties of the BFKL equation and structure function predictions for HERA
The general properties of the Lipatov or BFKL equation are reviewed. Modifications to the infrared region are proposed. Numerical predictions for the deep-inelastic electron-proton structure functions at small $x$ are presented and confronted with recent HERA measurements.
1993-10-11
2009-10-22
[ "hep-ph" ]
A.J.Askew, J.Kwiecinski, A.D.Martin, P.J.Sutton
hep-ph/9310265
Minimal SO(10) Grand Unification: Predictions for Proton Decay and Neutrino Masses and Mixings:
Prospects for SO(10) as a minimal grand unification group have recently been heightened by several considerations such as the MSW resolution of the solar neutrino puzzle, baryogenesis, possibility for understanding fermion masses etc. I review the present status of the minimal SO(10) models with special emphasis on the...
1993-10-11
2007-05-23
[ "hep-ph" ]
R.N. Mohapatra
hep-ph/9310264
On the Asymptotics of Nielsen-Olesen Vortices
We investigate analytically and numerically the asymptotic behavior of the Nielsen-Olesen vortex solutions and show that they approach their asymptotic values exponentially but with exponents that differ from the ones quoted in the literature. In particular, it is shown that for values of the Higgs self-coupling that a...
1993-10-11
2009-10-22
[ "hep-ph", "astro-ph" ]
Leandros Perivolaropoulos
hep-ph/9310259
Factorization in graviton interactions
The study of factorization in the linearized gravity is extended to the graviton scattering processes with a massive scalar particle, with a massless vector boson and also with a graviton. Every transition amplitude is shown to be completely factorized and the physical implications of their common factors are discussed...
1993-10-11
2009-12-30
[ "hep-ph", "hep-th" ]
S. Y. Choi, J. S. Shim, and H. S. Song(Seoul National University)
hep-ph/9310257
Diffractive Dissociation and Eikonalization in High Energy pp and p $ {\bar p} $ Collisions
We show that eikonal corrections imposed on diffraction dissociation processes calculated in the triple Regge limit, produce a radical change in the energy dependence of the predicted cross section. The induced correction is shown to be in general agreement with the new experimental data measured at the Tevatron.
1993-10-11
2009-12-30
[ "hep-ph" ]
E. Gotsman, E.M. Levin and U. Maor
hep-ph/9310260
Planck Scale Effects and Axions in Supersymmetry
The effects of possible explicit violation of the Peccei-Quinn symmetry responsible for the solution of the strong CP problem are studied in supersymmetric models. It is shown that automatic models with an abelian $U(1)$ gauge symmetry are easy to construct both in the context of fundamental and composite models of axi...
1993-10-11
2010-11-01
[ "hep-ph" ]
E.A. Dudas
hep-ph/9310256
Some consequences in weak processes of three generations mixing in the leptonic sector
We investigate the sensitivity of some weak processes to a Cabibbo--Kobayashi--Maskawa mixing in the leptonic sector. Values for mixing angles and masses compatible with several experimental accelerator data were found. We discuss in this context neutrino oscillations, cosmological and astrophysical consequences as wel...
1993-10-09
2008-11-26
[ "hep-ph" ]
O.L.G. Peres, V. Pleitez and R. Zukanovich Funchal
hep-ph/9310255
Electroweak Discussion Section Summary
I summarize our work of electroweak discussion section held at the 14th International Workshop on Weak Interactions and Neutrinos. We discussed about a few physics topics related to electroweak interactions, including $B$ and $K$ physics and weak flavor physics.
1993-10-09
2009-09-25
[ "hep-ph" ]
C.S. Kim (Yonsei University, Seoul, Korea)
hep-ph/9310253
Which chiral symmetry is restored in hot QCD?
We review the current status of the problem of chiral symmetry restoration, discussing an open question of whether at the $SU(N_f)_A$ restoration point $T=T_c$ the $U(1)_A$ chiral symmetry is or is not (approximately) restored. New lattice and instanton-based studies are considered, and some new calculations are sugges...
1993-10-08
2007-05-23
[ "hep-ph", "hep-lat" ]
Edward Shuryak (Physics Department, SUNY at Stony Brook, NY and ITP, UCSB, Santa Barbara, CA)
hep-ph/9310252
Radiative corrections to quark-quark-reggeon vertex in QCD
One loop corrections to the coupling of the reggeized gluon to quarks are calculated in QCD. Combining this result with the known corrections to the gluon-gluon-reggeon vertex, we check the self-consistency of the representation of the amplitudes with gluon quantum numbers and negative signature in the $t$-channel in t...
1993-10-08
2009-10-22
[ "hep-ph" ]
V.S. Fadin, R. Fiore and A. Quartarolo
hep-ph/9310250
Strong Decays of $Q \bar Q$ Mesons
We present a detailed study of the two-body strong decays of light mesons. Both the space part and the spin-flavor-color part of the wave functions are generated algebraically and closed forms are obtained for all decays. Experimental deviations from our systematics are seen to be suggestive of both missing mesons and ...
1993-10-08
2009-10-22
[ "hep-ph" ]
C. Gobbi, F. Iachello and D. Kusnezov
hep-ph/9310249
Plasmon Decay: From QED to QCD
Upon using the same theoretical framework, I describe two interesting decay processes: the electromagnetic plasmon decay into neutrinos, which can be the dominant cooling mechanism for red giants and white dwarfs, and the gluonic plasmon decay into quarks, which can be measured in ultra-relativistic heavy-ion collision...
1993-10-08
2007-05-23
[ "hep-ph" ]
Tanguy Altherr
hep-ph/9310254
Energy Distribution of the Leptons in Top Decay to Charged Higgs
We analyze the energy distribution of the leptons coming from the top decay $t\ra b\hc,\ bW^+\ra bl^+\nu$. The correlation between the lepton energy distribution and the top spin may be useful for distinguishing the $\hc$ signature from the $W$ background. Such a correlation can also be useful for disentangling the two...
1993-10-08
2009-09-25
[ "hep-ph" ]
Alex Pomarol and Carl Schmidt
hep-ph/9310251
QCD Calculation of Heavy Meson Semileptonic Transitions
I review the QCD sum rules calculations of the form factors governing the semileptonic decays of charmed and beauty mesons. In particular, I discuss the predicted dependence of the various form factors on $q^2$ and how it can be obtained for the form factors of vector and axial currents. In some cases the $q^2$ depende...
1993-10-08
2007-05-23
[ "hep-ph" ]
P.Colangelo
hep-ph/9310247
From the Deuteron to Deusons, an Analysis of Deuteronlike Meson-Meson Bound States
A systematic study of possible deuteronlike two-meson bound states, {\it deusons}, is presented. Previous arguments that many such bound states may exist are elaborated with detailed arguments and numerical calculations including, in particular, the tensor potential. In the heavy meson sector one-pion exchange alone is...
1993-10-08
2009-07-09
[ "hep-ph" ]
Nils A. T\"ornqvist
hep-ph/9310248
Unstable particle mixing and CP violation in weak decays
We discuss unstable particle mixing in CP-violating weak decays. It is shown that for a completely degenerate system unstable particle mixing does not introduce a CP-violating partial rate difference, and that when the mixings are small only the off-diagonal mixings are relevant. Also, in the absence of mixing, unstabl...
1993-10-08
2010-11-01
[ "hep-ph" ]
Jiang Liu and Gino Segr\`e
hep-ph/9310246
Determining the Gluon Distributions in the Proton and Photon from Two-Jet Production at HERA
Two-jet production from the direct photon contribution at HERA is a sensitive measure of the small-$x$ gluon in the proton. We propose measurements of ratios of the jet cross-sections which will clearly distinguish between gluons with or without singular behaviour at small $x$. Furthermore, we show that analogous ratio...
1993-10-08
2008-11-26
[ "hep-ph" ]
JR Forshaw and RG Roberts
hep-ph/9310244
Higgs Boson Interference in $\gamma \gamma \rightarrow W^+W^-$
We study interference effects between resonant and nonresonant amplitudes for the $\gamma \gamma \rightarrow W^+ W^-$ process at a backscattered photon-photon collider. We show that a Higgs boson with $M_H$ > 200 GeV is manifest as a resonant dip in the $W^+W^-$ invariant mass spectrum and we investigate its statistica...
1993-10-07
2009-10-22
[ "hep-ph" ]
D.A. Morris, T.N. Truong and D. Zappala
hep-ph/9310241
Weak Hyperon Decays: Quark Sea and SU(3) Symmetry Breaking
An explanation of the difference in the values of the apparent $f/d$ ratios for the S- and P- wave amplitudes of nonleptonic hyperon decays is proposed. The argument is formulated in the framework of the standard pole model with $(56,0^{+})$ ground-state and $(70,1^{-})$ excited baryons as intermediate states for the P...
1993-10-07
2009-10-22
[ "hep-ph" ]
P.Zenczykowski
hep-ph/9310243
CP Violation in Fermion Pair Decays of Neutral Boson Particles
We study CP violation in fermion pair decays of neutral boson particles with spin 0 or 1. We study a new asymmetry to measure CP violation in $\eta, K_L \rightarrow \mu^+\mu^-$ decays and discuss the possibility of measuring it experimentally. For the spin-1 particles case, we study CP violation in the decays of $J/\ps...
1993-10-07
2010-11-01
[ "hep-ph" ]
Xiao-Gang He, J.P. Ma and B. McKellar
hep-ph/9310245
Squeezed Quantum State of Disoriented Chiral Condensate
We consider the quantum state describing the Disoriented Chiral Condensate (DCC) which may be produced in high energy collisions. Using the approach suggested by Rajagopal and Wilczek to describe the amplification of the long wavelength classical pion modes, we consider the quantum-mechanical evolution of the initial v...
1993-10-07
2016-09-01
[ "hep-ph", "hep-th", "nucl-th" ]
Ian I. Kogan
hep-ph/9310242
On Colour Rearrangement in Hadronic W$^+$W$^-$ Events
We discuss the possibility of colour rearrangement in $\ee \to \W^+ \W^- \to \q_1 \qbar_2 \q_3 \qbar_4$ events, i.e.\ that the original colour singlets $\q_1 \qbar_2$ and $\q_3 \qbar_4$ may be transmuted, for instance, into new singlets $\q_1 \qbar_4$ and $\q_3 \qbar_2$. The effects on event properties could be quite l...
1993-10-07
2011-02-15
[ "hep-ph" ]
Torbj\"orn Sj\"ostrand and Valery Khoze
hep-ph/9310238
The Light-flavor structure of the nucleon
Recent data on the Gottfried sum and less recent ones on the pion-nucleon sigma term seem to disagree with naive parton-based expectations on the light (i.e., up, down and strange) quark content of the nucleon. We show that these discrepancies are resolved if nonperturbative contributions are included in the analysis o...
1993-10-06
2014-11-17
[ "hep-ph" ]
Stefano Forte
hep-ph/9310239
Initial State Radiation in Resolved Photon Interactions
After a brief review of recent data that confirm qualitative and quantitative predictions for resolved photon processes, a possible problem with the implementation of initial state showering in existing Monte Carlo event generators is pointed out. It is argued that this is responsible for the rather poor description of...
1993-10-06
2007-05-23
[ "hep-ph" ]
M. Drees
hep-ph/9310237
Three Successful Tests of Color Transparency and Nuclear Filtering
We review the theoretical formalism for hard exclusive processes in a nuclear medium. Theory suggests that these processes will show the very interesting phenomena of color transparency and nuclear filtering. The survival probability in nuclear media has also been predicted to show a scaling behavior at large momentum ...
1993-10-06
2009-09-25
[ "hep-ph" ]
Pankaj Jain and John P. Ralston
hep-ph/9310236
Rigourous QCD Evaluation of Spectrum and Ground State Properties of Heavy Quarkonium Systems; with a Precision Determination of the bottom quark mass and of the eta-b mass
We present an evaluation of heavy quarkonium states (bottomium and charmonium) from first principles. We use tree-level QCD (including relativistic corrections) and the full one-loop potential; nonperturbative effects are taken into account at the leading order through the contribution of the gluon condensate <alpha_st...
1993-10-06
2009-10-22
[ "hep-ph" ]
S. Titard and F. F. Yndurain
hep-ph/9310231
Stability Analysis of Sum Rules for Compton Scattering
We perform a stability analysis of a recently proposed sum rule for pion Compton scattering at fixed angle and moderate Mandelstam invariants. The sum rule is found to be sensitive to the parameter $\lambda^2$, the contour radius of a generalized Borel transform. A modified phenomenological model for the continuum cont...
1993-10-06
2009-10-22
[ "hep-ph" ]
Claudio Coriano'(Stockholm and Uppsala Univ.) and Hsiang-nan Li (National Chung Cheng Univ.)
hep-ph/9310235
An Asymptotically Free Phi4 Theory
The Phi4 theory in 4-epsilon dimensions has two fixed points, which coincide in the limit epsilon->0. One is a Gaussian UV fixed point, and the other a non-trivial IR fixed point. They lead to two different continuum field theories. The commonly adopted IR theory is ``trivial,'' behaves like perturbation theory, and su...
1993-10-06
2009-09-25
[ "hep-ph" ]
Kerson Huang
hep-ph/9310234
On the Parton Interpretation of Quark Fragmentation into Hadrons with Different Spins
We calculate the spin density matrix of the hadron $h$ created via quark fragmentation in the process $e^-e^+ \to q\bar q \to h + X$. In the case of $h=\Lambda$ the experimental data could possibly elucidate the problem of $s$-quark contribution to the spin of the $\Lambda$-hyperon, to be compared with the case of the ...
1993-10-06
2007-05-23
[ "hep-ph" ]
A. Anselm, M. Anselmino, F. Murgia and M.G. Ryskin
hep-ph/9310233
Top Quark Production Cross Section
The production rate for top quarks at the Fermilab Tevatron is presented using the exact order $\alpha_s^3$ corrected cross section and the resummation of the leading soft gluon corrections in all orders of perturbation theory.
1993-10-06
2008-11-26
[ "hep-ph" ]
E.Laenen, J.Smith and W.L. van Neerven
hep-ph/9310232
The Fine-Tuning Problem of the Electroweak Symmetry Breaking Mechanism in Minimal SUSY Models
We calculate the region of the MSSM parameter space (i.e. $M_{1/2}$, $m_{0}$, $\mu$, \ldots) compatible with a correct electroweak breaking and a realistic top-quark mass. To do so we have included {\em all} the one-loop corrections to the effective potential $V_{1}$ and checked their importance in order to obtain cons...
1993-10-06
2007-05-23
[ "hep-ph" ]
B. de Carlos and J.A. Casas
hep-ph/9310224
{\it T}--odd Asymmetry in Chargino Pair Production Processes
$T$--violating asymmetry in chargino pair production processes is studied in the Minimal Supersymmetric Standard Model. The asymmetry emerges at the tree level in the production of two different charginos,and could be as large as of order $10^{-2}$ in unpolarized electron beam experiments and $10^{-1}$ in polarized ele...
1993-10-05
2007-05-23
[ "hep-ph" ]
Yoshiki Kizukuri and Noriyuki Oshimo
hep-ph/9310227
Octet-Baryon Form Factors in the Diquark Model
We present an alternative parameterization of the quark-diquark model of baryons which particularly takes care of the most recent proton electric form-factor data from the E136 experiment at SLAC. In addition to electromagnetic form factors of the nucleon, for which good agreement with data is achieved, we discuss the ...
1993-10-05
2009-10-22
[ "hep-ph" ]
R. Jakob, P. Kroll, M. Schuermann and W. Schweiger
hep-ph/9310223
Heavy Charged Lepton Pair Production Through Photon Fusion at Hadron Supercolliders
The pair production of charged heavy leptons via two photon fusion is considered for hadron collisions at SSC and LHC energies. Rates for the inelastic process $pp \rightarrow \gamma \gamma X \rightarrow L^+L^-X$ and the elastic process $pp \rightarrow \gamma \gamma pp \rightarrow L^+L^- pp$ are given in a Weizs\"{a}ck...
1993-10-05
2007-05-23
[ "hep-ph" ]
G. Bhattacharya, P. A. Kalyniak, and K. A. Peterson
hep-ph/9310225
On Deusons or Deuteronlike Meson-Meson Bound States
The systematics of deuteronlike two-meson bound states, {\it deusons}, is discussed. Previous arguments that many of the present non-$q\bar q$ states are such states are elaborated including, in particular, the tensor potential. For pseudoscalar states the important observation is made that the centrifugal barrier from...
1993-10-05
2008-11-26
[ "hep-ph" ]
Nils A. T\"ornqvist
hep-ph/9310230
Radiatively induced electron and electron-neutrino masses
We consider, in the context of a 331 model with a single neutral right-handed singlet, the generation of lepton masses. At zeroth order two neutrinos and one charged lepton are massless, while the other leptons, two neutrinos and two charged leptons, are massive. However the charged ones are still mass degenerate. The ...
1993-10-05
2009-09-25
[ "hep-ph" ]
F. Pisano, V. Pleitez and M.D. Tonasse
hep-ph/9310228
How to Make Large Domains of Disoriented Chiral Condensate
Rajagopal and Wilczek have proposed that relativistic nuclear collisions can generate domains in which the chiral condensate is disoriented. If sufficiently large ({\it i.e.} nucleus sized), such domains can yield measurable fluctuations in the number of neutral and charged pions. However, by numerical simulation of th...
1993-10-05
2009-10-22
[ "hep-ph", "hep-lat", "nucl-th" ]
Sean Gavin, Andreas Gocksch and Robert D. Pisarski
hep-ph/9310229
Flavour Singlet ${\cal O}(\alpha_s^2 m_b^2/m_t^2)$ Corrections to the Partial Decay Rate $\Gamma(Z\rightarrow b\bar{b})$
We analytically compute the flavour singlet ${\cal O}(\alpha_s^2 m_b^2/m_t^2)$ radiative corrections to the partial decay rate $\Gamma(Z\rightarrow b\bar{b})$. These corrections arise from anomalous ``double traingle'' diagrams containing a single $\gamma_5$ matrix inside each of two closed fermion loops. They represen...
1993-10-05
2016-09-01
[ "hep-ph" ]
K.G.Chetyrkin, A.Kwiatkowski
hep-ph/9310226
Aspects of Neutrino Cosmology
Primordial nucleosynthesis constrains the properties of light, stable neutrinos. Apart from the well--known limit on the number of neutrino species, there are also bounds on neutrino masses and magnetic moments. I discuss also sterile neutrinos and neutrino propagation in a primordial magnetic field, such as could be t...
1993-10-05
2007-05-23
[ "hep-ph" ]
Kari Enqvist
hep-ph/9310217
Can $\gamma \gamma \rightarrow Z_L Z_L$ serve as a probe of the electroweak symmetry breaking sector ?
We investigate the feasibility of distinguishing among different models of electroweak symmetry breaking by studying the process $\gamma \gamma \rightarrow Z_L Z_L$ at photon colliders. For models with a low mass Higgs-like scalar resonance, the $s$-channel contribution provides a distinct resonance structure and large...
1993-10-04
2009-10-22
[ "hep-ph" ]
R. Rosenfeld
hep-ph/9310222
Vacuum Misalignment in High Energy Collisions
We study a recent proposal to observe the disoriented chiral condensate in high energy collisions. In order to produce a large fluctuation in pion probability distribution, a large size of the correlated region is essential. We study the role of the intrinsic symmetry breaking and suggest that a negative (mass)^2 of me...
1993-10-04
2009-12-30
[ "hep-ph", "nucl-th" ]
Zheng Huang (LBL)
hep-ph/9310219
Hadron Multiplicities in the Presence of Light Gluinos
We consider the effect of a massless gluino on the evolution of a parton shower. The hadron multiplicity distribution is predicted to evolve as a function of the collider energy in the same way as in the absence of gluinos, except for a slower running of $\alpha_s$. A comparison of the predicted average hadron multipli...
1993-10-04
2009-10-22
[ "hep-ph" ]
Frank Cuypers
hep-ph/9310220
Beauty and the Beast: What Lattice QCD Can Do for $B$ Physics
The role lattice QCD can play in $B$ physics is surveyed. We include results for the decay constant, and discuss upcoming calculations of semileptonic form factors and neutral-meson mixing. Together with experimental measurements, these calculations can determine the unitarity triangle. Plenary talk presented at the Wo...
1993-10-04
2008-02-03
[ "hep-ph", "hep-lat" ]
Andreas S. Kronfeld
hep-ph/9310215
Influence of Light and Heavy Thresholds on SUSY Unification
In this paper we study and compare susy unification using two different approaches in order to take into account the effect of light particle thresholds on the evolution of gauge couplings: the step--function approximation, on the one hand, and a mass dependent procedure, which gives a more accurate description of the ...
1993-10-04
2008-11-26
[ "hep-ph" ]
M. Bastero-Gil and J. Perez-Mercader
hep-ph/9310214
QCD Effects in Particle Production on Nuclei
I discuss some questions related to hard scattering processes in nuclei and corrections to the leading twist approximation. The QCD factorization theorem requires that high energy partons do not lose energy while traversing the nucleus. I explain the physical reason for this. The theorem also states that spectator part...
1993-10-04
2007-05-23
[ "hep-ph" ]
Paul Hoyer
hep-ph/9310211
Squark Mass Determination at the Next Generation of Linear $e^+e^-$ Colliders
Current mass limits allow the possibility that squarks may be produced in large numbers at the next generation of linear $e^+e^-$ colliders. In this paper we investigate the prospects for precision studies of squark masses at such colliders. We assume that squarks are lighter than gluinos, and discuss both direct and c...
1993-10-04
2009-10-22
[ "hep-ph" ]
Jonathan Feng, Donald Finnell
hep-ph/9310213
Electroweak Processes and Precision Tests
Review of the electroweak sector of the minimal standard model, Basic LEP processes at the tree level, 1-loop radiative corrections in the on-shell renormalization scheme, Star scheme and oblique corrections, Introduction to oblique parameters.
1993-10-04
2007-05-23
[ "hep-ph" ]
Probir Roy
hep-ph/9310212
The Decay $b \to s \gamma$ In The Mssm Revisited
We present a re-analysis of the decay $\bsgamma$ in the Minimal Supersymmetric Standard Model with radiatively induced breaking of $SU(2) \times U(1)$. We extend this analysis to regions of the supersymmetric parameter space wider than those previously studied. Results are explicitly presented for $m_t=150\GeV$. We emp...
1993-10-04
2011-07-19
[ "hep-ph" ]
F.M. Borzumati (Institut f\"ur Theoretische Physik)
hep-ph/9310221
Strongly interacting $W$ bosons and supersymmetry
We present arguments in favor of the idea that supersymmetric sigma models with compact symmetric K\"ahler spaces as target manifolds have a second-order phase transition in four dimensions. When applied to electroweak symmetry breaking, these models then do not require a light Higgs boson or techni-resonances but pred...
1993-10-04
2009-10-22
[ "hep-ph" ]
S. Yu. Khlebnikov
hep-ph/9310218
Testing Unified Supersymmetric Models
I define the Standard Supersymmetric Model (SSM) as the minimal supersymmetric extension ofthe Standard Model with gauge coupling unification and universal soft supersymmetry breaking at the unification scale. This well-defined model has a five-dimensional space of unknown parameters ($m_t, \tan\beta, m_{1/2}, m_0, A$)...
1993-10-04
2007-05-23
[ "hep-ph" ]
S. Kelley
hep-ph/9310216
Comparison of 1/mQ^2 Corrections in Mesons and Baryons
We extend our relativistic quark model to the study of the decay Lambda_b -> Lambda_c ell nu and verify that the model satisfies the heavy-quark symmetry constraints at order 1/mQ^2. We isolate a strong dependence on a parameter which measures the relative distortion in the light-quark wave functions of the Lambda_b an...
1993-10-04
2010-11-01
[ "hep-ph" ]
B. Holdom, M. Sutherland and J. Mureika
hep-ph/9310206
Production of CP-Odd Higgs Bosons with Large Transverse Momentum at Hadron Supercolliders
A two Higgs doublet model is employed to study the production of a CP-odd Higgs boson ($A$) associated with a large transverse momentum jet ($j$) at hadron supercolliders. The cross section of $pp \to jA+X$ is evaluated with four subprocesses: $gg \to gA$, $gq \to qA$, $g\bar{q} \to \bar{q}A$ and $q\bar{q} \to gA$. We ...
1993-10-01
2010-11-01
[ "hep-ph" ]
Chung Kao
hep-ph/9310207
Solar Neutrino Decay
We re-examine the neutrino decay solution to the solar neutrino problem in light of the new data from Gallex II and Kamiokande III. We compare the experimental data with the solar models of Bahcall and Pinsonneault and Turck-Chieze and find that neutrino decay is ruled out as a solution to the solar neutrino problem at...
1993-10-01
2009-04-13
[ "hep-ph" ]
Andy Acker and Sandip Pakvasa
hep-ph/9310208
Order m alpha^8 Contributions to the Decay Rate of Orthopositronium
We discuss how contributions to the order ${\cal O} (m \alpha^8)$ orthopositronium decay rate can be separated into two categories, one due to relativistic momenta and calculable in terms of QED scattering amplitudes, the other due to low momenta and calculable in the simpler framework of a low-energy effective theory ...
1993-10-01
2009-10-22
[ "hep-ph" ]
P. Labelle, G.P. Lepage and U. Magnea
hep-ph/9310201
Electroweak Symmetry Breaking at the Supercollider
Invited talk presented at the Workshop on Physics at Current Accelerators and the Supercollider, Argonne, Illinois, and at the 17th Johns Hopkins Workshop on Current Problems in Particle Theory, Budapest, Hungary.
1993-10-01
2007-05-23
[ "hep-ph" ]
Jonathan A. Bagger
hep-ph/9310209
A new signal for scalar top bound state production
We study the production and decay of a scalar \stst\ bound state \sigst\ at hadron supercolliders, where \st\ is the lighter stop eigenstate. If \st\ has no tree--level 2--body decays, the dominant decay modes of \sigst\ are $gg$ or, if $m_h < \mst \ll \mstt$, a pair of light scalar Higgs bosons $h$. Nevertheless the b...
1993-10-01
2009-10-22
[ "hep-ph" ]
M. Drees and M.M. Nojiri
hep-ph/9310205
New perturbative upper bound on M_H from fermionic Higgs decays at two loops
We present the dominant two-loop ${\rm O}\left(G_F^2M_H^4\right)$ electroweak corrections to the fermi\-onic decay widths of a high-mass Higgs boson in the Standard Model. The corrections are negative and quite significant, and are larger in magnitude than the one-loop electroweak corrections for $M_H\gsim 400\ {\rm Ge...
1993-10-01
2009-09-25
[ "hep-ph" ]
Loyal Durand, Bernd Kniehl, and Kurt Riesselmann
hep-ph/9310202
Gauge-independent extraction of the next-to-leading-order Debye mass from the gluon propagator
It is shown that by defining the Debye mass through the relevant pole of the static gluon propagator rather than the zero-momentum limit of the time-time component of the gluon self-energy, a gauge-independent result for the next-to-leading order correction can be derived upon resummation of hard-thermal-loop contribut...
1993-10-01
2008-02-03
[ "hep-ph", "hep-lat", "hep-th" ]
A. K. Rebhan
hep-ph/9310204
Gamma^*, Z^* production in polarised p-p scattering as a probe of the proton spin structure
We present the results of a detailed study of the large transverse momentum Drell-Yan process, pp --> (Gamma^*, Z^*)X --> l^+l^- X at collider energies, with either one or both protons polarised, allowing the study of single- and double-spin asymmetries respectively. We show how these asymmetries obtained from angular ...
1993-10-01
2009-10-22
[ "hep-ph" ]
E. Leader and Sridhar K
hep-ph/9310203
Measuring $\Lambda_{\overline{MS}}$ at LEP
We show that standard next-to-leading order (NLO) perturbative QCD analyses used to extract $\alpha_{s}$ from LEP data do not serve to disentangle the completely unknown renormalization scheme (RS) invariant next-NLO (NNLO) and higher-order uncalculated corrections from those dependent on the renormalization scale in a...
1993-10-01
2007-05-23
[ "hep-ph" ]
D.T. Barclay, C.J. Maxwell and M.T. Reader
hep-ph/9310210
Gauge Invariant Three-Boson Vertices in the Standard Model and the Static Properties of the W
We use the S-matrix pinch technique to derive to one loop-order gauge independent $\gamma W^{+} W^{-} $ and Z $W^{+} W^{-}$ vertices in the context of the Standard Model,with all three incoming momenta off-shell. We show that the $\gamma W^{+} W^{-}$ vertex so constructed is related to the gauge-independent W self-ener...
1993-10-01
2009-10-22
[ "hep-ph" ]
Joannis Papavassiliou and Kostas Philippides
hep-ph/9309336
Effects of the large gluon polarization on $xg_1^d(x)$ and J/$\psi$ productions at polarized ep and pp collisions
The recent SMC data of $xg_1^d(x)$ are reproduced with the large polarized gluons. To study further the polarized gluon distribution in a proton, we calculate the spin--dependent differential cross section for J/$\psi$ leptoproductions and the two--spin asymmetry for J/$\psi$ hadroproductions. Its experimental implicat...
1993-09-30
2009-10-22
[ "hep-ph" ]
T.Morii, S.Tanaka and T.Yamanishi
hep-ph/9309335
Naturalness Versus Supersymmetric Non-renormalization Theorems
We give an intuitive proof of a new non-renormalization theorem in supersymmetric field theories. It applies both perturbatively and non-perturbatively. The superpotential is not renormalized in perturbation theory but receives non-perturbative corrections. However, these non-perturbative corrections are {\it not} gene...
1993-09-30
2008-11-26
[ "hep-ph", "hep-th" ]
N. Seiberg
hep-ph/9309334
The Bess Model at e+ e- Colliders
We consider the possibility of detecting vector resonances from a strong electroweak sector, in the framework of the BESS model, at future $e^+ e^-$ colliders up to the TeV range. If the mass $M_V$ of the new vector boson multiplet is not far above or if it is below the maximum machine energy, such a contribution would...
1993-09-29
2007-05-23
[ "hep-ph" ]
R. Casalbuoni, P. Chiappetta, A. Deandrea, S. De Curtis, D. Dominici and R. Gatto
hep-ph/9309332
Examples of Semiclassical Instanton-Like Scattering: Massless $\phi^4$ and SU(2) Gauge Theories
Two-parameter sets of solutions to the classical field equations in the massless $\phi^4$ model and SU(2) gauge theory are found, each solution presumably describing a multi-particle instanton-like transition at high energy. In the limit of small number of initial particles, the probability of the transition is suppres...
1993-09-29
2010-11-01
[ "hep-ph" ]
D.T.Son and P.G.Tinyakov
hep-ph/9309333
Gluon multiplication in high energy heavy ion collisions
Hot gluons are the dominant components of the QCD plasma to be formed in future high energy heavy ion experiments. In this paper we study the elementary processes in the plasma medium for gluon multiplication based on all orders of the tree-diagrams in perturbative QCD. When applying to the chemical equilibration in th...
1993-09-29
2008-11-26
[ "hep-ph", "nucl-th" ]
L.Xiong and E.Shuryak
hep-ph/9309331
Trying to Catch the Elusive $a^0$ and More. Reactions Initiated by $b$--Quarks the Higgs Sector of ${\cal MSSM}$
We study the cross sections for the production of a neutral, intermediate mass Higgs boson in the processes $pp\rightarrow tq'\Phi$, $pp\rightarrow tW^-\Phi$ and $pp\rightarrow bZ^0\Phi$ in the Minimal Supersymmetric Standard Model ($\Phi=H^0,h^0$ and $A^0$) at Supercollider energies. The additional heavy particles ($t...
1993-09-28
2009-10-22
[ "hep-ph" ]
A. Ballestrero, E. Maina, S. Moretti and C. Pistarino
hep-ph/9309330
Phenomenological Quark Mass Matrix Model with Two Adjustable Parameters
A phenomenological quark mass matrix model which includes only two adjustable parameters is proposed from the point of view of the unification of quark and lepton mass matrices. The model can provide reasonable values of quark mass ratios and Kobayashi-Maskawa matrix parameters.
1993-09-28
2010-11-01
[ "hep-ph" ]
Yoshio Koide
hep-ph/9309327
Energy Levels Of Hydrogen-Like Atomsand Fundamental Constants
The present review includes the description of theoretical methods for the investigations of the spectra of hydrogen-like systems. Various versions of the quasipotential approach and the method of the effective Dirac equation are considered. The new methods, which have been developed in the eighties, are described. The...
1993-09-27
2011-07-19
[ "hep-ph", "hep-th" ]
Valeri V. Dvoeglazov, Rudolf N. Faustov, Yuri N. Tyukhtyaev
hep-ph/9309328
On the $A$ dependence of $R = \sigma_L/\sigma_T$ and the $Q^2$ dependence of Shadowing
A higher--twist nuclear enhancement of $R = \sigma_L/\sigma_T$, as might be expected to arise due to fermi motion and whose magnitude is within the error-bars of recent experiment, is shown to lead to a monotonic {\it decrease} in the ratio of nuclear vs. nucleon cross--sections at small Bjorken $x$ for {\it increasing...
1993-09-27
2008-11-26
[ "hep-ph" ]
J. Milana
hep-ph/9309329
On the $p^4$--corrections to $K \to 3\pi$ decay amplitudes in nonlinear and linear chiral models
The calculations of isotopic amplitudes and their results for the direct $CP$--violating charge asymmetry in $K^\pm \to 3\pi$ decays within the nonlinear and linear ($\sigma$--model) chiral Lagrangian approach are compared with each other. It is shown, that the latter, taking into account intermediate scalar resonances...
1993-09-27
2007-05-23
[ "hep-ph" ]
A.A.Bel'kov, G.Bohm, A.V.Lanyov, A.Schaale