hep-ph daily 9612491 -- 9612495 received (over 2605 served) 1626

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received from Tue 31 Dec 96 01:00:02 GMT to Wed 1 Jan 97 01:00:03 GMT
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Paper: hep-ph/9612491
From: Tom Browder <t...@uhheph.phys.hawaii.edu>
Date: Mon, 30 Dec 1996 16:23:46 -1000 (HST)

Title: Hadronic Decays of B Mesons
Authors: T.E. Browder (University of Hawaii at Manoa)
Comments: 13 pages, LATEX format. University of Hawaii preprint UH-511-863-96.
To appear in the Proceedings of the Third International Symposium on
Radiative Corrections in Cracow, Poland and in Acta Polonica
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We review recent experimental results on hadronic decays and lifetimes of
hadrons containing $b$ and $c$ quarks. We discuss charm counting and the
semileptonic branching fraction in B decays, the color suppressed amplitude in
B decay, and the search for gluonic penguins in B decay.
\\ (http://xxx.lanl.gov/abs/hep-ph/9612491 , 31kb)
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Paper: hep-ph/9612492
From: "Dr.Peter Henning" <P.He...@gsi.de>
Date: Tue, 31 Dec 1996 08:18:43 +0100

Title: Thermalization of a Quark-Gluon Plasma
Authors: P.A.Henning, M.Blasone, R.Fauser and P.Zhuang
Comments: 19 pages, latex (revtex), 4 figures, also available at
ftp://tpri6c.gsi.de/pub/phenning/hbfz96/
Report-no: GSI-96-57
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The thermalization time for a Quark-Gluon-Plasma is estimated from a quantum
transport model beyond the quasi-particle approach (or kinetic gas theory).
While our ansatz is crude concerning the properties of ''real'' quarks and
gluons, it nevertheless takes very serious the basic principles of quantum
field theory for non-equilibrium states. It is found, that the thermalization
time obtained from quantum transport theory is substantially longer than from
kinetic theory. In our view this casts some doubts on scenarios which a priori
assume a thermalized quark gluon plasma.
\\ (http://xxx.lanl.gov/abs/hep-ph/9612492 , 77kb)
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Paper: hep-ph/9612493
From: on...@theo.phys.sci.hiroshima-u.ac.jp (Tetsuya Onogi)
Date: Tue, 31 Dec 96 19:28:13 JST

Title: Predictions of $m_b/m_{\tau}$ and $m_t$ in an Asymptotically Non-Free
Theory
Authors: Masako Bando, Joe Sato, Tetsuya Onogi, Tatsu Takeuchi
Comments: 20 pgs. 6 figures. Latex2e. othersym.sty, subeqn.sty included
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We discuss an extention of the Minimal Supersymmetric Standard Model (MSSM)
with the 4th and anti-4th generations which have $SU(2)_L\times U(1)_Y$
invariant masses. Due to the the extra generations, all three running gauge
couplings become asymptotically non-free while preserving gauge coupling
unification at the GUT scale. We show that due to the asymptotically non-free
character of the gauge couplings: (1) the top and bottom Yukawa couplings are
strongly focused onto infrared fixed points as they are evolved down in scale
making their values at $\mu=\mz$ insensitive to their initial values at
$\mu=\mgut$; (2) the model predicts $\R(\mz) \equiv Y_b/Y_\tau |_{\mu
=\mz}\approx 1.8$, which is consistent with the experimental value provided we
take the ratio of Yukawa couplings at the GUT scale to be $\R(\mgut) =
Y_b/Y_\tau |_{\mu = \mgut} = 1/3$; (3) the $t$ mass prediction comes out to be
$\mt\approx 180 \GeV$ which is also consistent with experiment.
\\ (http://xxx.lanl.gov/abs/hep-ph/9612493 , 114kb)
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Paper: hep-ph/9612494
From: cris...@sophia.ecm.ub.es (cristina manuel)
Date: Tue, 31 Dec 1996 03:58:20 -0800

Title: Magnetic Screening at Finite Temperature
Author: Cristina Manuel
Comments: 21 pages, RevTex
Report-no: ECM-UB-PF-96/24
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It is shown that at finite temperature and in the presence of magnetic
sources magnetic fields are screened. This is proven within the framework of
classical transport theory both for the Abelian and non-Abelian plasmas.
Magnetic screening arises in this formalism as a consequence of polarization
effects occurring in the plasmas, and it is non-perturbative in the gauge
coupling constant. It is then discussed whether this mechanism could be
relevant in realistic quantum gauge field theories, such as QCD.
\\ (http://xxx.lanl.gov/abs/hep-ph/9612494 , 18kb)
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Paper: hep-ph/9612495
From: zha...@phys1.technion.ac.il (Zhang Daxin)
Date: Tue, 31 Dec 1996 14:20:33 +0200

Title: The Long Distance Contribution to $D\to\pi l^+l^-$
Authors: Paul Singer, Da-Xin Zhang
Comments: Latex file, 10 pages, no figure
Report-no: TECHNION-PH-96-10
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We calculate the long distance contribution to $D^{+,0}\to\pi^{+,0}l^+l^-$
decays by the use of a vector meson dominance model, in which the $\phi$-meson
plays the central role. The branching ratios obtained are $10^{-6}$ and a few
times $10^{-7}$ for the resonance and non-resonance regions respectively. The
analysis includes a calculation of $D^+\to\pi^+\phi$, consistent with the
experimental value.
\\ (http://xxx.lanl.gov/abs/hep-ph/9612495 , 7kb)
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Title: Recent Seminal Results
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Comments: 3 pages, latex, no figures, mpeg simulations available at
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Report-no: EFI-96-40
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