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Paper: hep-ph/9701276
From: bran...@black-hole.physics.ubc.ca (Robert Brandenberger)
Date: Sun, 12 Jan 1997 18:19:15 -0800
Title: Particle Physics Aspects of Modern Cosmology
Author: Robert H. Brandenberger (Brown Univ.)
Comments: 70 pages, 17 figures, 1 table, uses LATEX and epsf; invited lectures
at the 15th Symposium on Theoretical Physics, Aug. 22 - 28 1996, Seoul,
Korea, to be publ. in "Field Theoretical Methods in Fundamental Physics"
Report-no: BROWN-HET-1067
\\
Modern cosmology has created a tight link between particle physics / field
theory and a wealth of new observational data on the structure of the Universe.
These lecture notes focus on some of the most important aspects concerning the
connection between theory and observations. The lectures begin with an overview
of some recent progress and problems in inflationary cosmology. In particular,
a pedagogical discussion of the theory of reheating is presented. The second
topic is a survey of the theory of cosmological perturbations, the cornerstone
of modern cosmology. The focus is on the gauge-invariant classical and quantum
theory of fluctuations. The third topic concerns the role of topological
defects in cosmology. Reviews of the cosmic string theory of galaxy formation
and of defect-mediated GUT and electroweak baryogenesis are given.
\\ (http://xxx.lanl.gov/abs/hep-ph/9701276 , 217kb)
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Paper: hep-ph/9701277
From: Bernd Kniehl <kni...@vms.mppmu.mpg.de>
Date: Mon, 13 Jan 1997 11:36:01 +0100
Title: Three-Loop O(alpha_s^2 G_F M_t^2) Corrections to Hadronic Higgs Decays
Authors: K.G. Chetyrkin, B.A. Kniehl, M. Steinhauser (MPI Munich)
Comments: 23 pages (Latex), 9 figures (Postscript), accepted for publication in
Nuclear Physics B
Report-no: MPI/PhT/96-110
\\
We calculate the top-quark-induced three-loop corrections of O(alpha_s^2 G_F
M_t^2) to the Yukawa couplings of the first five quark flavours in the
framework of the minimal standard model with an intermediate-mass Higgs boson,
with mass M_H << 2M_t. The calculation is performed using an
effective-Lagrangian approach implemented with the hard-mass procedure. As an
application, we derive the O(alpha_s^2 G_F M_t^2) corrections to the H -> q
q-bar partial decay widths, including the case q=b. The couplings of the Higgs
boson to pairs of leptons and intermediate bosons being known to O(alpha_s^2
G_F M_t^2), this completes the knowledge of such corrections in the Higgs
sector. We express the results both in the MS-bar and on-shell schemes of mass
renormalization. We recover the notion that the QCD perturbation expansions
exhibit a worse convergence behaviour in the on-shell scheme than they do in
the MS-bar scheme.
\\ (http://xxx.lanl.gov/abs/hep-ph/9701277 , 30kb)
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Paper: hep-ph/9701278
From: Marco Ciuchini <Marco.C...@cern.ch>
Date: Mon, 13 Jan 1997 12:13:43 +0100 (MET)
Title: $\epsilon'/\epsilon$: three years later
Authors: Marco Ciuchini (CERN and INFN)
Comments: 15 pages, 3 EPS figures, uses epsfig.sty. Invited talk to the 4th KEK
Topical Conference on "Flavor Physics", KEK, Japan, 29-31 October 1996
Report-no: CERN-TH/97-2
\\
Three years after the completion of the next-to-leading order calculation,
the status of the theoretical estimates of $\epsilon'/\epsilon$ is reviewed.
In spite of the theoretical progress, the prediction of $\epsilon'/\epsilon$
is still affected by a 100% theoretical error. In this paper the different
sources of uncertainty are critically analysed and an updated estimate of
$\epsilon'/\epsilon$ is presented. Some theoretical implications of a value
of $\epsilon'/\epsilon$ definitely larger than $10^{-3}$ are also discussed.
\\ (http://xxx.lanl.gov/abs/hep-ph/9701278 , 33kb)
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Paper: hep-ph/9701279
From: UN02...@wvnvaxa.wvnet.edu
Date: Mon, 13 Jan 1997 08:47:06 -0500 (EST)
Title: Structure of the Gluon Propagator at Finite Temperature
Author: H. Arthur Weldon
Comments: 21 pages, latex, no figures
\\
The thermal self-energy of gluons generally depends on four Lorentz-invariant
functions. Only two of these occur in the hard thermal loop approximation of
Braaten and Pisarski because of the abelian Ward identity
$K_{\mu}\Pi^{\mu\nu}_{\rm htl}=0$. However, for the exact self-energy
$K_{\mu}\Pi^{\mu\nu}\neq 0$. In linear gauges the Slavnov-Taylor identity is
shown to require a non-linear relation among three of the Lorentz-invariant
self-energy function: $(\Pi_{C})^{2}=(K^{2}-\Pi_{L})\Pi_{D}$. This reduces the
exact gluon propagator to a simple form containing only two types of poles: one
that determines the behavior of transverse electric and magnetic gluons and one
that controls the longitudinally polarized electric gluons.
\\ (http://xxx.lanl.gov/abs/hep-ph/9701279 , 11kb)
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Paper: hep-ph/9701280
From: "u.meissner" <kph...@ikp187.ikp.kfa-juelich.de>
Date: Mon, 13 Jan 1997 15:36:04 +0100
Title: Recent developments in heavy baryon chiral perturbation theory: Selected
topics
Author: Ulf-G. Mei{\ss}ner
Comments: 13 pp, LaTeX, uses epsf, 4 figures, review talk, YITP International
Workshop on ``Recent Developments in QCD and Hadron Physics'', Kyoto, Japan,
December 16-18, 1996, to appear in the proceedings
Report-no: KFA-IKP(TH)-1997-03
\\
I review recent results in baryon chiral perturbation theory, in particular
related to pion-nucleon scattering and first systematic attempts to go beyond
next-to-leading order in the case of three flavors. New insight into the chiral
expansion of the baryon masses and magnetic moments is presented.
\\ (http://xxx.lanl.gov/abs/hep-ph/9701280 , 39kb)
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Paper: hep-ph/9701281
From: p...@dxnhd4.mpi-hd.mpg.de (Pirner)
Date: Mon, 13 Jan 97 17:26:31 +0100
Title: Thermodynamics of Constituent Quarks
Authors: H.J. Pirner, M. Wachs (Heidelberg)
Comments: 24 pages, 5 Postscript figures, uses article.sty, epsf.sty,
epsfig.sty
\\
We investigate the thermal behavior of quarks and antiquarks interacting via
a temperature-dependent linear potential. The quarks are constituent quarks
with dynamically generated masses from the background linear $\sigma$-model.We
find a transition from a system of bound mesons to a correlated quark gas at
the same temperature as the chiral transition temperature.
\\ (http://xxx.lanl.gov/abs/hep-ph/9701281 , 19kb)
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Paper: hep-ph/9701282
From: Elizabeth H. Simmons <sim...@smyrd.bu.edu>
Date: Mon, 13 Jan 1997 09:48:06 MST
Title: Colorons: Theory and Phenomenology
Authors: E. H. Simmons
Comments: 7 pages. Talk presented at the 1996 International Workshop on
Perspectives of Strong Coupling Gauge Theories (SCGT 96), Nagoya, Japan
Report-no: BUHEP-97-1
\\
We briefly describe the structure and phenomenology of a flavor-universal
extension of the strong interactions, focusing on the color-octet of massive
gauge bosons (`colorons') present in the low-energy spectrum. We discuss
current limits on the colorons and what future measurements may reveal.
\\ (http://xxx.lanl.gov/abs/hep-ph/9701282 , 19kb)
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Paper: hep-ph/9701283
From: Lee Jae Sik <js...@supy.kaist.ac.kr>
Date: Sat, 15 Jun 1996 01:43:55 +0900 (KST)
Title: Constraints on the R-parity and Lepton Flavor Violating Couplings from
B0 Decays to Two Charged Leptons
Authors: Ji-Ho Jang, Jae Kwan Kim and Jae Sik Lee
Comments: 8 pages, no figure
Report-no: KAIST-TH 97/01
\\
We derive the constraints on some products of R-parity and lepton flavor
violating constants from the decays of neutral $B$ meson into two charged
leptons. We find that some of these constraints are new and stronger than the
previous results.
\\ (http://xxx.lanl.gov/abs/hep-ph/9701283 , 7kb)
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Paper: hep-ph/9701284
From: Alex Kovner <kov...@mnhepw.hep.umn.edu>
Date: Mon, 13 Jan 1997 14:10:38 -0600
Title: The BFKL Equation from the Wilson Renormalization Group
Author: Jamal Jalilian-Marian, Alex Kovner, Andrei Leonidov and Heribert
Weigert
Comments: 23 pages, latex, requires axodraw.sty
Report-no: TPI--MINN--96--28/T, NUC--MINN--96--22/T, HEP--MINN--96--1524
\\
We discuss the Wilson renormalization group approach to the effective action
for low $x$ physics. It is shown that in the linearized, weak field regime the
RG equation reduces to the BFKL equation for the evolution of the unintegrated
gluon density. We discuss the relation of this approach with that of Lipatov.
\\ (http://xxx.lanl.gov/abs/hep-ph/9701284 , 16kb)
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Paper: hep-ph/9701285
From: Luc Marleau <lmar...@phy.ulaval.ca>
Date: Mon, 13 Jan 1997 17:04:03 -0500
Title: Scalar Leptoquark Pair Production at the CERN LHC: Signal and
Backgrounds
Authors: B. Dion, M. de Montigny, L. Marleau, and G. Simon
Comments: 10 pages, 10 figures, latex (revtex)
Report-no: LAVAL-PHY-9617, ALBERTA-THY-39-96
\\
We present the results of an analysis for the pair production of scalar
leptoquarks at the CERN Large Hadron Collider (LHC) with $\sqrt{s}=14$ TeV and
${\cal L}=10$ fb$^{-1}$ which includes the dominant sources of Standard Model
background associated to this process: $Z^{*}jj$ and $t {\bar t}$ production.
We consider leptoquarks introduced in the framework of a supersymmetric grand
unified $E_6$ model. The leptoquark production is found to be dominant in most
regions of parameter space, except near the $Z$ pole where the Drell-Yan
background is peaked. Otherwise the $t {\bar t}$ process provides the main
source of background. We establish the discovery reach of the leptoquarks at
750 GeV (1 TeV) for a branching ratio of $BR(LQ \rightarrow eq)=0.5$
($BR=1$).
\\ (http://xxx.lanl.gov/abs/hep-ph/9701285 , 37kb)
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Paper: hep-ph/9701286
From: ARK...@theor3.lbl.gov
Date: Mon, 13 Jan 1997 16:10:47 -0800
Title: Building Models Of Gauge Mediated Supersymmetry Breaking Without A
Messenger Sector
Authors: Nima Arkani-Hamed, John March-Russell, and Hitoshi Murayama
Comments: 33 pages, LaTeX. Report number: LBNL-39865, UCB-PTH-96/55,
IASSNS-HEP-96/106
\\
We propose a general scheme for constructing models in which the Standard
Model (SM) gauge interactions are the mediators of supersymmetry breaking to
the fields in the supersymmetric SM, but where the SM gauge groups couple
directly to the sector which breaks supersymmetry dynamically. Despite the
direct coupling, the models preserve perturbative unification of the SM gauge
coupling constants. Furthermore, the supergravity contributions to the squark
and slepton masses can be naturally small, typically being much less than 1%
of the gauge mediated contributions. Both of these goals can be achieved
without need of a fine-tuning or a very small coupling constant. This scheme
requires run-away directions at the renormalizable level which are only lifted
by non-renormalizable terms in the superpotential. To study the proposed scheme
in practice, we develop a modified class of models based on $SU(N)\times
SU(N-1)$ which allows us to gauge a $SU(N-2)$ global symmetry. However, we
point out a new problem which can exist in models where the dynamical
supersymmetry breaking sector and the ordinary sector are directly coupled --
the two-loop renormalization group has contributions which can induce negative
$(mass)^2$ for the squarks and sleptons. We clarify the origin of the
problem and argue that it is likely to be surmountable. We give a recipe for a
successful model.
\\ (http://xxx.lanl.gov/abs/hep-ph/9701286 , 33kb)
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Paper (*cross-listing*): astro-ph/9701056
From: Michael Kachelriess <mi...@phoenix.tp1.ruhr-uni-bochum.de>
Date: Sun, 12 Jan 1997 07:59:59 MST
Title: Axion cyclotron emissivity of magnetized white dwarfs and neutron stars
Authors: M. Kachelriess, C. Wilke and G. Wunner
Comments: 11 pages, 4 ps figures, revtex
\\
The energy loss rate of a magnetized electron gas emitting axions a due to
the process $e^- \to e^- +a$ is derived for arbitrary magnetic field strength
B. Requiring that for a strongly magnetized neutron star the axion luminosity
is smaller than the neutrino luminosity we obtain the bound $g_{ae}\lsim
10^{-10}$ for the axion electron coupling constant. This limit is considerably
weaker than the bound derived earlier by Borisov and Grishina using the same
method. Applying a similar argument to magnetic white dwarf stars results in
the more stringent bound $g_{ae}\lsim 5x10^{-13} (T/10^7 K)^{5/4} (B/10^{10}
G)^{-2}$ where T is the internal temperature of the white dwarf.
\\ (http://xxx.lanl.gov/abs/astro-ph/9701056 , 40kb)
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Paper (*cross-listing*): nucl-th/9701017
From: Carlos A. da Rocha <car...@nucthy.phys.washington.edu>
Date: Wed, 8 Jan 1997 19:47:42 MST
Title: Ghost poles in the nucleon propagator in the linear-sigma model approach
and its role in pion-nucleon low-energy theorems
Authors: C.A. da Rocha, G. Krein, and L. Wilets
Comments: 13 pages, 5 embedded figures, Latex 2.09, Revtex.sty, epsf.sty. To be
published in Nucl. Phys. A
Report-no: DOE/ER/40427-26-N96
\\
Complex mass poles, or ghost poles, are present in the Hartree-Fock solution
of the Schwinger-Dyson equation for the nucleon propagator in renormalizable
models with Yukawa-type meson-nucleon couplings, as shown many years ago by
Brown, Puff, and Wilets (BPW). These ghosts violate basic theorems of quantum
field theory and their origin is related to the ultraviolet behavior of the
model interactions. Recently, Krein et.al, proved that the ghosts disappear
when vertex corrections are included in a self-consistent way, softening the
interaction sufficiently in the ultraviolet region. In previous studies of
pion-nucleon scattering using "dressed" nucleon propagator and bare vertices,
did by Nutt and Wilets in the 70's (NW), it was found that if these poles are
explicitly included, the value of the isospin-even amplitude A+ is satisfied
within 20% at threshold. The absence of a theoretical explanation for the
ghosts and the lack of chiral symmetry in these previous studies led us to
re-investigate the subject using the approach of the linear-sigma model and
study the interplay of low-energy theorems for pion-nucleon scattering and
ghost poles. For bare interaction vertices we find that ghosts are present in
this model as well and that the A+ value is badly described. As a first
approach to remove these complex poles, we dress the vertices with
phenomenological form factors and a reasonable agreement with experiment is
achieved. In order to fix the two cutoff parameters, we use the A+ value for
the chiral limit (m_pion -> 0) and the experimental value of the isoscalar
scattering length. Finally, we test our model by calculating the phase shifts
for the S waves and we find a good agreement at threshold.
\\ (http://xxx.lanl.gov/abs/nucl-th/9701017 , 95kb)
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Paper (*cross-listing*): physics/9701008
From: BA...@bnlarm.bnl.gov
Date: Fri, 10 Jan 1997 11:47:25 -0500
Title: Exact Dirac equation calculation of ionization and pair production
induced by ultrarelativistic heavy ions
Author: A. J. Baltz (Brookhaven National Laboratory)
Comments: 13 pages, latex, revtex source, one postscript figure
Report-no: BNL-63494
Subj-class: Atomic Physics
\\
An exact solution of the time-dependent Dirac equation for ionization and
pair production induced by ultrarelativistic heavy ion collisions is presented.
Exact transition probabilities, equivalent to those that would be obtained in
an untruncated basis coupled channels calculation, are presented. Exact
bound-electron positron pair production probabilities are calculated to be
mostly smaller than those calculated with the same potential in perturbation
theory at impact parameters small enough for differences to occur.
\\ (http://xxx.lanl.gov/abs/physics/9701008 , 12kb)
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Paper: hep-ph/9608383
replaced with revised version Mon, 13 Jan 1997 13:35:08 -0500 (EST)
Title: Parity Violation in Bottom Quark Pair Production at Polarized Hadron
Colliders
Authors: Chung Kao, David Atwood and Amarjit Soni
Comments: To be published in Physics Letters B, 3 references added
Report-no: UR-1384, MADPH-96-968
\\ (http://xxx.lanl.gov/abs/hep-ph/9608383 , 84kb)
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Paper: hep-ph/9610380
replaced with revised version Mon, 13 Jan 1997 16:41:20 GMT
Title: Theory of Small $x$ Deep Inelastic Scattering NLO Evaluations, and low
$Q^2$ Analysis
Authors: K. Adel, F. Barreiro and F. J. Yndur\'ain
Comments: Tex file plus .ps figures. This paper includes the results from FTUAM
96-39 [hep-ph/9610380] and FTUAM 96-44 [hep-ph/9612469]
Report-no: FTUAM96-39
\\ (http://xxx.lanl.gov/abs/hep-ph/9610380 , 533kb)
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Paper: hep-ph/9612272
replaced with revised version Mon, 13 Jan 1997 18:32:59 +0100 (MET)
Title: CP in R-parity Violating Models
Authors: S. A. Abel
Comments: 11 pages requires axodraw.sty, Comments and references added
Report-no: ULB-TH-96/21
\\ (http://xxx.lanl.gov/abs/hep-ph/9612272 , 12kb)
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Paper (*cross-listing*): astro-ph/9610252
replaced with revised version Mon, 13 Jan 1997 16:04:48 +0200 (IST)
Title: Hadronic Production of TeV Gamma Ray Flares from Blazars
Authors: Arnon Dar and Ari Laor
Comments: Accepted for Publication in ApJL with minor changes
\\ (http://xxx.lanl.gov/abs/astro-ph/9610252 , 9kb)
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Paper (*cross-listing*): hep-th/9605027
replaced with revised version Mon, 13 Jan 1997 13:32:42 EST
Title: The Gross-Neveu Model and the Supersymmetric and Non-Supersymmetric
Nambu-Jona-Lasinio Model in a Magnetic Field
Authors: V.Elias, D.G.C.McKeon, V.A.Miransky, and I.A.Shovkovy
Comments: ReVTeX file, 14 pages including 1 figure. The final version that was
published in Phys.Rev
Journal-ref: Phys.Rev. D54 (1996) 7884
\\ (http://xxx.lanl.gov/abs/hep-th/9605027 , 19kb)
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Paper (*cross-listing*): hep-th/9606174
replaced with revised version Mon, 13 Jan 1997 13:28:00 -0500 (EST)
Title: Invariant Regularization of Anomaly-Free Chiral Theories
Authors: Lay Nam Chang and Chopin Soo
Comments: 28pgs, LaTeX. Typos corrected. Further remarks on singlet currents
Report-no: VPI-IPPAP-96-3
\\ (http://xxx.lanl.gov/abs/hep-th/9606174 , 20kb)
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Title: Recent Seminal Results
Authors: Author One and Author Two
Comments: 3 pages, latex, no figures, mpeg simulations available at
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Report-no: EFI-96-40
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