Title: Unification of Gauge and Yukawa Couplings without Symmetry
Authors: Jisuke Kubo, Myriam Mondragon, Marek Olechowski, George Zoupanos
Comments: 23 pages
Report-no: Kanazawa University Report KANAZAWA-96-09
\\
A natural gradual extension of the idea of Grand Unification is to attempt to
relate the gauge and Yukawa couplings; Gauge-Yukawa Unification (GYU). However,
within the framework of renormalizable field theories, there exists no
realistic symmetry that leads to a GYU. Here we propose an approach to GYU
which is based on the principle of the reduction of couplings and finiteness in
supersymmetric Grand Unified Theories. We elucidate how the observed top-bottom
mass hierarchy can be explained in terms of supersymmetric GYU by considering
an example of the $SU(5)$ Finite Unified Theory. It is expected that, when more
accurate measurements of the top and bottom quark masses are available, it will
be possible to discriminate among the various GYU models.
\\ (http://xxx.lanl.gov/abs/hep-ph/9606434 , 18kb)
------------------------------------------------------------------------------
\\
Paper: hep-ph/9606435
From: Renard Fernand Michel <ren...@LPM.univ-montp2.fr>
Date: Wed, 26 Jun 1996 08:54:30 +0200 (MET DST)
Title: Effective lagrangian description of top production and decay
Authors: G.J. Gounaris, M. Kuroda, F.M. Renard
Comments: 36 pages (9 figures available through email in .uu form)
Report-no: PM/96-22, THES-TP 96/06
\\
We propose a rather general description of residual New Physics (NP) effects
on the top quark couplings. These effects are described in terms of 20 gauge
invariant $dim=6$ operators involving gauge and Higgs bosons as well as quarks
of the third family. We compute their implications for the $\gamma t\bar t$, $Z
t \bar t$ and $tbW$ vertices and study their observability in the process
$e^-e^+ \to t\bar t$ with $t\to bW \to b\ell^+\nu_\ell$. We present results for
the integrated cross section, the angular distribution and various decay
distribution and polarization asymmetries for NLC energies of $0.5-2~TeV$.
Observability limits are discussed and interpreted in terms of the NP scales
associated to each operator through the unitarity constraints. The general
landscape of the residual NP effects in the heavy quark and bosonic sectors is
also presented.
\\ (http://xxx.lanl.gov/abs/hep-ph/9606435 , 32kb)
------------------------------------------------------------------------------
\\
Paper: hep-ph/9606436
From: h...@phys.sinica.edu.tw (Hsien-chung Kao)
Date: Wed, 26 Jun 96 15:50:49 CST
Title: $Zb\bar{b}$ Loop Correction with Charge 2/3 Singlet Quarks
Authors: Wei-Shu Hou and Hsien-chung Kao
Comments: 11 pages, uses latex. Three figures included
\\
We calculate the non-universal correction to the $Zb\bar{b}$ vertex in a
simple extension of the Standard Model, where a charge $+2/3$ isosinglet quark
is added to the standard spectrum. Comparison is made with other solutions to
$R_b$ (and $R_c$) that demand particles lighter than $M_W$.
\\ (http://xxx.lanl.gov/abs/hep-ph/9606436 , 33kb)
------------------------------------------------------------------------------
\\
Paper: hep-ph/9606437
From: Bodo Lampe <b...@MPPMU.MPG.DE>
Date: Wed, 26 Jun 1996 10:04:04 +0200 (MDT)
Title: Directions in High Energy Physics
Authors: Bodo Lampe
Comments: Tex source file and figures in tar.gz format
Report-no: MPI-Ph/94-76
\\
The future goals of particle physics are classified from a theorist's point
of view. The prospects of mass and mixing angle determination and of the top
quark and Higgs boson discovery are discussed. It is shown that the most
important progress will come from LHC and NLC. These machines should be planned
and developed as quickly as possible.
\\ (http://xxx.lanl.gov/abs/hep-ph/9606437 , 52kb)
------------------------------------------------------------------------------
\\
Paper: hep-ph/9606438
From: Jose Ramon Espinosa <espi...@x4u2.desy.de>
Date: Wed, 26 Jun 1996 12:36:36 +0200 (MST)
Title: Bosonic Thermal Masses in Supersymmetry
Authors: D. Comelli (Valencia) and J.R. Espinosa (DESY)
Comments: 20 pages, LaTeX, plus one postscript figure
Report-no: DESY 96-114,FTUV/96-37,IFIC/96-45,IEM-FT-134/96
\\
Effective thermal masses of bosonic particles in a plasma play an important
role in many different phenomena. We compute them in general supersymmetric
models at leading order. The origin of different corrections is explicitly
shown for the formulas to be applicable when some particles decouple. The
correct treatment of Boltzmann decoupling in the presence of trilinear
couplings and mass mixing is also discussed. As a relevant example, we present
results for the Minimal Supersymmetric Standard Model.
\\ (http://xxx.lanl.gov/abs/hep-ph/9606438 , 31kb)
------------------------------------------------------------------------------
\\
Paper: hep-ph/9606439
From: Tomoko Uesugi <tom...@phys.ocha.ac.jp>
Date: Wed, 26 Jun 1996 21:20:06 +0900
Title: Quantum Subcritical Bubbles
Authors: Tomoko Uesugi, Masahiro Morikawa and Tetsuya Shiromizu
Comments: Latex file, 9pp, to be published in Progress of Theoretical Physics
Report-no: UTAP-234,OCHA-PP-80,RESCEU-21/96
\\
We quantize subcritical bubbles which are formed in the weakly first order
phase transition. We find that the typical size of the thermal fluctuation
reduces in the quantum-statistical physics. We estimate the typical size and
the amplitude of thermal fluctuations near the critical temperature in the
electroweak phase transition using quantum statistical average. Furthermore
based on our study, we give implication on the dynamics of phase transition.
\\ (http://xxx.lanl.gov/abs/hep-ph/9606439 , 8kb)
------------------------------------------------------------------------------
\\
Paper: hep-ph/9606440
From: k...@hadron.tp2.ruhr-uni-bochum.de (Hyun-Chul Kim)
Date: Wed, 26 Jun 1996 14:41:38 +0200 (DFT)
Title: Strange vector form factors of the nucleon in the SU(3) chiral
quark-soliton model with the proper kaonic cloud
Authors: Hyun-Chul Kim, Teruaki Watabe, and Klaus Goeke
Comments: 27 pages with 8 figures. RevTeX and epsfig.sty are used. Submitted to
Nucl. Phys. A
Report-no: RUB-TPII-11/95
\\
The strange vector form factors are evaluated in the range between $Q^2=0$
and $Q^2=1\ \mbox{GeV}^2$ in the framework of the SU(3) chiral quark-soliton
model (or semi-bosonized SU(3) Nambu-Jona-Lasinio model). The rotational
$1/N_c$ and $m_s$ corrections are taken into account up to linear order. Taking
care of a proper Yukawa-tail of the kaonic cloud, we get $\langle
r^{2}\rangle^{\rm Sachs}_{s}=-0.095\; \mbox{fm}^2$ and $\mu_s = -0.68\;\mu_N$.
The results are compared with several different models.
\\ (http://xxx.lanl.gov/abs/hep-ph/9606440 , 115kb)
------------------------------------------------------------------------------
\\
Paper: hep-ph/9606441
From: ho...@qcd.th.u-psud.fr (hong)
Date: Wed, 26 Jun 1996 14:45:06 +0100
Title: Regge Behaviour and Regge Trajectory for Ladder Graphs in Scalar phi^3
Field Theory
Author: R. Hong Tuan
Comments: Plain TeX, 10 pages, 2 PostScript figures included
Report-no: LPTHE Orsay 96/46
\\
Using the gaussian representation for propagators (which can be proved to be
exact in the infinite number of loops limit) we are able to derive the Regge
behaviour for ladder graphs of $\phi^3$ field theory in a completely new way.
An analytic expression for the Regge trajectory $\alpha (t/m^2)$ is found in
terms of the mean-values of the Feynman $\alpha$-parameters. $\alpha(t/m^2)$ is
calculated in the range $- 1.8 < t/m^2 < 0.4$. The intercept $\alpha (0)$
agrees with that obtained from earlier calculations using the Bethe-Salpeter
approach for $\alpha (0) \gsim 0.3$.
\\ (http://xxx.lanl.gov/abs/hep-ph/9606441 , 12kb)
------------------------------------------------------------------------------
\\
Paper: hep-ph/9606442
From: mr...@ibmna35.fuw.edu.pl (Stanislaw Mrowczynski)
Date: Wed, 26 Jun 1996 14:56:09 +0200
Title: Color filamentation in ultrarelativistic heavy-ion collisions
Author: Stanislaw Mrowczynski
Comments: 4 pages, no macros
\\
We study color fluctuations in the quark-gluon plasma produced at the early
stage of nucleus-nucleus collision at RHIC or LHC. The fluctuating color
current, which flows along the beam, can be very {\it large} due to the strong
anisotropy of the parton momentum distribution. A specific fluctuation, which
splits the parton system into the current filaments parallel to the beam
direction, is argued to grow exponentially. The physical mechanism responsible
for the phenomenon, which is known as a filamentation instability, is
discussed.
\\ (http://xxx.lanl.gov/abs/hep-ph/9606442 , 6kb)
------------------------------------------------------------------------------
\\
Paper: hep-ph/9606443
From: Thomas Teubner <Thomas....@durham.ac.uk>
Date: Wed, 26 Jun 1996 15:15:44 BST
Title: Diffractive open charm production at HERA
Authors: E. M. Levin (LAFEX, Brazil), A. D. Martin (Centre for Particle Theory,
Durham), M. G. Ryskin (Nucl. Phys. Inst., Petersburg) and T. Teubner (CPT,
Durham)
Comments: 34 pages, LaTeX, 15 Postscript figures included using epsf. The
complete paper, including figures, is also available via anonymous ftp at
ftp://cpt1.dur.ac.uk/pub/preprints/dtp96/dtp9650/
Report-no: DTP/96/50
\\
We use perturbative QCD to calculate the cross sections $\sigma^{L,T}$ for
the diffractive production of open charm $(c\overline{c})$ from longitudinally
and transversely polarised photons (of virtuality $Q^2$) incident at high
energy $(\sqrt{s})$ on a proton target. We study both the $Q^2$ and $M^2$
dependence of the cross sections, where $M$ is the invariant mass of the
$c\overline{c}$ pair. Surprisingly, the result for $\sigma^T$, as well as for
$\sigma^L$, is perturbatively stable. We estimate higher-order corrections and
find a sizeable enhancement of the cross sections. The cross sections depend on
the {\it square} of the gluon density $g (x, K^2)$, and we show that the
observation of open charm at the HERA electron-proton collider can act as a
sensitive probe of the gluon distribution for $x = (Q^2 + M^2)/s$ and scale
$K^2 = (m_c^2 + \langle k_T^2 \rangle) (1 + Q^2/M^2)$ where the average quark
transverse momentum squared $\langle k_T^2 \rangle \sim m_c^2$. As compared to
diffractive $J/\psi$ production, open charm has the advantage that it is
independent of the non-perturbative ambiguities arising from the $J/\psi$ wave
function. We estimate the fraction of diffractive events that arise from
$c\overline{c}$ production.
\\ (http://xxx.lanl.gov/abs/hep-ph/9606443 , 91kb)
------------------------------------------------------------------------------
\\
Paper: hep-ph/9606444
From: lu...@phys4.technion.ac.il (Cai-dian Lu)
Date: Thu, 27 Jun 1996 00:29:45 +0300
Title: Radiative Dileptonic Decays of B Mesons
Authors: Gad Eilam, Cai-Dian Lu and Da-Xin Zhang
Comments: 11 pages latex file, including 3 figures
Report-no: TECHNION-PH-96-12
\\
We investigate the radiative dileptonic decays $B_s(B_d)\to\gamma l^+l^-$
within the standard model. Using the constituent quark model, the branching
ratios turn out to be around $5\times 10^{-9}$ for $B_s\to \gamma \mu^+\mu^- $
and around $6\times 10^{-10}$ for $B_d \to \gamma \mu^+\mu^- $, with slightly
larger values for $B_s(B_d) \to \gamma e^+e^- $. Differential spectrums over
the dilepton invariant mass are given. The possibility of using these processes
to determine the decay constants of $B_s$ or $B_d$ is discussed.
\\ (http://xxx.lanl.gov/abs/hep-ph/9606444 , 15kb)
------------------------------------------------------------------------------
\\
Paper: hep-ph/9606445
From: va...@flamenco.ific.uv.es
Date: Wed, 26 Jun 1996 17:31:09 +0200 (METDST)
Title: Supernova Bounds on Supersymmetric $R$-parity Violating Interactions
Authors: H. Nunokawa, A. Rossi and J. W. F. Valle
Comments: latex file, 19 pages, including 5 figures
Report-no: FTUV/96-33; IFIC/96-39
\\
We re-examine resonant massless-neutrino conversions in a dense medium
induced by flavour changing neutral current (FCNC) interactions. We show how
the observed $\bar\nu_e$ energy spectra from SN1987a and the supernova
$r$-process nucleosynthesis provide constraints on supersymmetric models with
$R$ parity violation, which are much more stringent than those obtained from
the laboratory. We also suggest that resonant massless-neutrino conversions may
play a positive role in supernova shock reheating. Finally, we examine the
constraints on explicit $R$-parity-violating FCNCs in the presence of non-zero
neutrino masses in the eV range, as indicated by present hot dark matter
observations.
\\ (http://xxx.lanl.gov/abs/hep-ph/9606445 , 55kb)
------------------------------------------------------------------------------
\\
Paper: hep-ph/9606446
From: "Haim Goldberg, (617)373-2957" <GOLD...@hex.neu.edu>
Date: Wed, 26 Jun 1996 14:11:08 -0400 (EDT)
Title: How Georgi-Jarlskog and SUSY-SO(10) imply a measurable rate for mu->e
gamma
Authors: Haim Goldberg, Mario Gomez (Northeastern University)
Comments: 4 pages, LaTex, uses espcrc2.sty and axodraw.sty (both attached),
epsfig.sty. Talk given (by HG) at SUSY-96 Conference on Supersymmetry,
University of Maryland, to be published in Proceedings of the conference
Report-no: NUB-3133/96-Th
\\
Slepton mass matrices have been analyzed in an SO(10) SUSY-GUT, with
soft-breaking terms generated at Planck scale. Higher dimensional operators
consistent with 4-d string constructions are used in order to generate a
Georgi-Jarlskog (G-J) Yukawa texture at \mgut. Radiative corrections between
\mpl\ and \mgut\ generate a substantial non-universality in the
$\tilde\mu-\tilde e$ sector. This non-universality originates in the flavor
dependence of the Higgs assignments required for the G-J texture, and is
unrelated to the large top Yukawa. The resulting branching ratio for mu->e
could make this process observable for large sectors of the MSSM parameter
space, with a factor of 10 improvement in statistics.
\\ (http://xxx.lanl.gov/abs/hep-ph/9606446 , 21kb)
------------------------------------------------------------------------------
\\
Paper: hep-ph/9606447
From: BISWA <bisw...@ictp.trieste.it>
Date: Wed, 26 Jun 1996 21:19:55 +0200 (MET DST)
Title: Magnitude of R-parity violation in String Inspired GUTs
Authors: M. Bastero-Gil (SISSA), B. Brahmachari (ICTP) and R. N. Mohapatra (U.
Maryland)
Comments: 16 pages, two figures
\\
The nature of R-parity violating interactions in two classes of string
inspired supersymmetric grand unified theories (SISUSY GUT), based on the gauge
groups $SO(10)$ (and its subgroup $SU(2)_L\times SU(2)_R\times SU(4)_c\equiv
G_{224}$) as well as $[SU(3)]^3$, are discussed and their strengths are related
to the ratio of symmetry breaking scales present in the model. We first argue
that for the R-parity violating couplings $\lambda_{R\!\!\!/}$ to be suppressed
to the desired level, the $B-L$ local symmetry must break at an intermediate
scale $M_{B-L}$ since $\lambda_{R\!\!\!/} =M_{B-L}/M_{GUT}$. We then construct
scenarios where such intermediate scales arise being consistent with gauge
coupling unification in a two-loop renormalization group study. In the
resulting $SO(10)$ models, higher-dimensional-operator-induced R-parity
violating couplings are potentially large (except in one case), and are
therefore inconsistent with limits on the proton life time unless the couplings
associated with the higher dimensional terms are fine tuned to very small
values. However, the $[SU(3)]^3$ and $G_{224}$ models can be consistent if a
certain class of quark-lepton coupling in the superpotential is forbidden by a
discrete summetry (unrelated to R-parity). An interesting prediction of these
models is neutron-anti-neutron oscillation with observable strength.
\\ (http://xxx.lanl.gov/abs/hep-ph/9606447 , 14kb)
------------------------------------------------------------------------------
\\
Paper: hep-ph/9606448
From: Arjun Berera <ber...@phys.psu.edu>
Date: Wed, 26 Jun 1996 17:25:48 -0400
Title: Diffractive Factorization - a Simple Field Theory Model for
$F_2^{diff}(\beta x_{\pom}, Q^2; x_{\pom},t)$
Author: Arjun Berera
Comments: 5 pages, talk at DIS-96, Rome, Italy
Report-no: PSU/TH/169
\\
Operator definitions of diffractive parton distribution functions are given.
A distinction is made between the special case of ``Regge factorization'' to
the general case of ``diffractive factorization'' with explicit expressions for
$F_2^{diff}(\beta x_{\pom}, Q^2;x_{\pom},t)$ in both cases. A calculation from
a simple field theory model is presented in the style of ``constituent counting
rules'' for the behavior of the diffractive parton distribution functions when
$\beta \rightarrow 1$, which corresponds to when the detected parton carries
almost all of the longitudinal momentum transferred from the scattered hadron.
A comment is made about the consistency of the model with the observed
flattening of $n(\beta)$ as $\beta \rightarrow 1$, which recently was reported
by the H1-collaboration from their preliminary 1994 data.
\\ (http://xxx.lanl.gov/abs/hep-ph/9606448 , 5kb)
------------------------------------------------------------------------------
\\
Paper: hep-ph/9606449
From: Hitoshi Murayama (Berkeley) <MURA...@theorm.lbl.gov>
Date: Wed, 26 Jun 1996 17:05:42 -0700 (PDT)
Title: Excluding Light Gluinos from $Z$ decays
Authors: Andr\'e de Gouv\^ea and Hitoshi Murayama (LBNL,UCB)
Comments: 12 pages, LaTeX, uses psfig, four EPS figures
Report-no: LBL-39030
\\
We reanalyze the constraints on light gluinos ($m_{\tilde{g}}\leq
5$~GeV$/c^2$) from the hadronic $Z$ decays into four jets. We find that the
published OPAL data from the 1991 and 1992 runs exclude a light gluino with
mass $\lesssim 1.5$~GeV$/c^2$ at more than 90\% confidence level. This limit
depends little on assumptions about the gluino fragmentation and the definition
of the gluino mass. The exclusion confidence level is shown as a function of
the mass. A future projection is briefly discussed. We also discuss
quantitatively how the distributions in the Bengtsson--Zerwas and the modified
Nachtmann--Reiter angles change due to the finite bottom quark or gluino mass.
\\ (http://xxx.lanl.gov/abs/hep-ph/9606449 , 73kb)
%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-
------------------------------------------------------------------------------
\\
Paper (*cross-listing*): hep-th/9606149
From: C...@bari.infn.it
Date: Mon, 24 Jun 1996 14:33:37 +0100 (WET-DST)
Title: Vacuum Stability for Dirac Fermions in Three Dimensions
Author: Paolo Cea
Comments: RevTex, 9 pages, uuencoded, gzip'ed file
Report-no: Bari-Th 238/96
\\
I investigate three dimensional abelian and non-abelian gauge theories
interacting with Dirac fermions. Using a variational method I evaluate the
vacuum energy density in the one-loop approximation. It turns out that the
states with a constant magnetic condensate lie below the perturbative ground
state only in the case of three dimensional quantum electrodynamics with
massive fermions.
\\ ( (*cross-listing*): hep-th/9606149 )
------------------------------------------------------------------------------
\\
Paper (*cross-listing*): hep-th/9606167
From: Yutaka Hosotani <yut...@mnhepw.hep.umn.edu>
Date: Tue, 25 Jun 1996 16:30:36 -0500 (CDT)
Title: Gauge Theory Model -- quark dynamics and anti-ferromagnets
Author: Yutaka Hosotani
Comments: 5 pages. 1 ps file and sprocl.sty attached. To appear in the
Proceedings of the 2nd Sakharov Conference, Moscow, May 1996
Report-no: UMN-TH-1431/96
\\
Two-dimensional QED with N-flavor fermions serves as a model of quark
dynamics in QCD as well as an effective theory of an anti-ferromagnetic spin
chain. It is reduced to N-degree quantum mechanics in which a potential is
self-consistently determined by the Schr\"odinger equation itself.
\\ ( (*cross-listing*): hep-th/9606167 )
%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%
------------------------------------------------------------------------------
\\
Paper: hep-ph/9604208
replaced with revised version Wed, 26 Jun 1996 09:59:30 -0400
Title: Charm and Bottom Semileptonic Decays
Authors: Patrick J. O'Donnell and Gursevil Turan
Comments: Latex, 19 pages, two figures are attached, a minor change in the
manuscript related to this
Report-no: UTPT--96--06
\\
------------------------------------------------------------------------------
\\
Paper: hep-ph/9604237
replaced with revised version Wed, 26 Jun 1996 22:15:29 -0500 (CDT)
Title: Helicity Decomposition for Inclusive $J/\psi$ Production
Authors: Eric Braaten, Yu-Qi Chen
Comments: 29 pages, Latex file. a version with minor modifications
Report-no: OHSTPY-HEP-T-96-010, NUHEP-TH-96-2
\\
------------------------------------------------------------------------------
\\
Paper: hep-ph/9606404
replaced with revised version Wed, 26 Jun 1996 12:52:56
Title: Heavy-to-light form factors in the quark model with heavy
infrapropagators
Authors: M.A. Ivanov and Yu.M. Valit
Comments: 19 pages, 3 Postscript figures available upon request from
iva...@thsun1.jinr.dubna.su . References corrected
\\
------------------------------------------------------------------------------
\\
Paper: hep-ph/9606429
replaced with revised version Wed, 26 Jun 1996 15:03:40 +0200
Title: Gauge Invariant YFS Exponentiation of (Un)stable $W^+W^-$ Production At
and Beyond LEP2 Energies
Authors: S. Jadach (Institute of Nuclear Physics, Krakow, Poland and CERN,
Theory Division, Geneva, Switzerland), W. Placzek (Department of Physics and
Astronomy, The University of Tennessee, Knoxville, Tennessee), M. Skrzypek
(Institute of Nuclear Physics, Krakow, Poland) and B.F.L. Ward (Department of
Physics and Astronomy, The University of Tennessee, Knoxville, Tennessee and
SLAC, Stanford University, Stanford, California)
Comments: Latex replaces postscript, 17 pages
Report-no: UTHEP-95-0801
\\
------------------------------------------------------------------------------
\\
Paper (*cross-listing*): hep-th/9511073
replaced with revised version Wed, 26 Jun 1996 20:06:43 -0400
Title: Wilson Renormalization Group Study of Inverse Symmetry Breaking
Author: Thomas G. Roos
Comments: 39 pages REVTeX, 13 Postscript figures. An appendix briefly
discussing the critical behavior has been added. Several typos have been
corrected and two additional references are included
Report-no: CLNS 95/1373
\\
%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---
-----------------------------------------------------------------------------
for e-mail address database, send To: e-m...@xxx.lanl.gov Subject: help
for european users, the database is duplicated as e-m...@babbage.sissa.it
-----------------------------------------------------------------------------
-----------------------------------------------------------------------------
********** N.B. these are "archives", not "bulletin boards" **********
(persons using the latter terminology will be excluded further access).
Third-party submissions (secretaries, ...) cause excessive problems.
Author self-submissions are exceedingly preferred. Format:
\\
Title: Recent Seminal Results
Authors: Author One and Author Two
Comments: 3 pages, latex, no figures, mpeg simulations available at
ftp://myhost.mydomain/path/file.mpg or at http://myhost.mydomain/RSR/file.mpg
Report-no: EFI-96-13
\\
text of abstract (you do not need Abstract: ...)
\\
body of paper