hep-ph daily 9701302 -- 9701315 received (over 2587 served) 1601

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Paper: hep-ph/9701302
From: ka...@hetsun1.phys.kobe-u.ac.jp
Date: Thu, 16 Jan 97 19:29:37 JST

Title: Unitarity of Neutral Kaon System
Author: Tsukasa Kawanishi (Kobe univ.)
Comments: 8 pages, LaTeX file
Report-no: KOBE-TH-96-04
\\
In neutral kaon system, we always use non-hermitian Hamiltonian for
convenience of treating decay process, unitarity seems to be lost. If we take
decay channels (\pi\pi, \pi\pi\pi, \pi\ell\nu etc.) into
account, however, Hamiltonian of the whole system must be hermitian. We attempt
to derive an effective Hamiltonian with respect to only K^0, $\bar{K}^0$
states, starting from the hermitian Hamiltonian. For brevity, we take only a
\pi\pi state into account as the decay channel in this paper. We can not
avoid an oscillation between K^0, $\bar{K}^0$ and \pi\pi states if we start
from a hermitian Hamiltonian whose states all have discrete energy levels. We
therefore treat the \pi\pi state more appropriately to have a continuous
energy spectrum to achieve the decay of K^0, $\bar{K}^0$ into \pi\pi. As
the consequence, we find a different time evolution from what we expect in the
conventional method immediately after the decay starts, though it recovers
Fermi's golden rule for long enough time scale.
\\ (http://xxx.lanl.gov/abs/hep-ph/9701302 , 6kb)
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Paper: hep-ph/9701303
From: CAM...@fi.infn.it
Date: Thu, 16 Jan 1997 11:56:34 +0100

Title: k-Factorization and Small-x Anomalous Dimensions
Author: G. Camici and M. Ciafaloni
Comments: Latex2e, 44 pages including 7 PostScript figures
Report-no: DFF 264/01/97
\\
We investigate the consistency requirements of the next-to leading BFKL
equation with the renormalization group, with particular emphasis on running
coupling effects and NL anomalous dimensions. We show that, despite some model
dependence of the bare hard Pomeron, such consistency holds at leading twist
level, provided the effective variable $\alpha_s(t) log(1/x)$ is not too large.
We give a unified view of resummation formulas for coefficient functions and
anomalous dimensions in the Q_0-scheme and we discuss in detail the new one for
the $q\bar{q}$ contributions to the gluon channel.
\\ (http://xxx.lanl.gov/abs/hep-ph/9701303 , 56kb)
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Paper: hep-ph/9701304
From: dev...@lpthe.jussieu.fr (Hector DE VEGA)
Date: Thu, 16 Jan 1997 12:11:52 +0100 (MET)

Title: Erice Lectures on Inflationary Reheating
Authors: D. Boyanovsky, H. J. de Vega and R. Holman
Comments: Latex file, 59 pages and 30 figures in .ps files. To appear in the
Proceedings of the 5th. Erice Chalonge School on Astrofundamental Physics, N.
S\'anchez and A. Zichichi eds., World Scientific, 1997
\\
At the end of the inflationary stage of the early universe, profuse particle
production leads to the reheating of the universe. Such explosive particle
production is due to parametric amplification of quantum fluctuations for the
unbroken symmetry case (appropriate for chaotic inflation), or spinodal
instabilities in the broken symmetry phase(which is the case in new inflation).
The self-consistent methods presented in these lectures are the only
approaches, so far, that lead to reliable quantitative results on the reheating
mechanism in the inflationary universe. They fully use the field theoretical
Schwinger-Keldysh out of equilibrium method in a non-perturbative way. These
approaches take into account the non-linear interaction between the quantum
modes and exactly conserve energy (covariantly). Simplified analysis that do
not include the full backreaction and do not conserve energy, result in unbound
particle production and lead to quantitatively erroneous results. For
spontaneously broken theories the issue of whether the symmetry may be restored
or not by the quantum fluctuations is analyzed. The precise criterion for
symmetry restoration is presented. The field dynamics is symmetric when the
energy density in the initial state is larger than the top of the tree level
potential. When the initial energy density is below the top of the tree level
potential, the symmetry is broken.
\\ (http://xxx.lanl.gov/abs/hep-ph/9701304 , 205kb)
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Paper: hep-ph/9701305
From: Antonio PICH <pi...@papageno.ific.uv.es>
Date: Thu, 16 Jan 1997 12:41:31 +0100

Title: QCD Tests from Tau Decays
Authors: A. Pich
Comments: 16 pages, latex, 3 Postscript figures, uses sprocl.sty, Invited Talk
at the 20th Johns Hopkins Workshop --Non Perturbative Particle Theory &
Experimental tests-- (Heidelberg, 27-29 June 1996)
Report-no: FTUV/97-03, IFIC/97-03
\\
The total $\tau$ hadronic width can be accurately calculated using
analyticity and the operator product expansion. The theoretical analysis of
this observable is updated to include all available perturbative and
non-perturbative corrections. The experimental determination of
$\alpha_s(M_\tau^2)$ and its actual uncertainties are discussed.
\\ (http://xxx.lanl.gov/abs/hep-ph/9701305 , 54kb)
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Paper: hep-ph/9701306
From: Joe Sato <j...@icrhp3.icrr.u-tokyo.ac.jp>
Date: Thu, 16 Jan 1997 20:39:15 +0900

Title: CP and T violation test in neutrino oscillation
Authors: Joe Sato
Comments: 10 pages,1 ps figure, LaTeX. Talk given at Fourth KEK Topical
Conference on Flavor Physics, 29-31 October 1996. To be published in Nucl.
Phys. B (Proc. Suppl.)
Report-no: ICRR-Report-380-97-3
\\
I examine how large violation of CP and T is allowed in long base line
neutrino experiments. When we attribute both the atmospheric neutrino anomaly
and the solar neutrino deficit to neutrino oscillation we may have a sizable T
violation effect proportional to the ratio of two mass differences; it is
difficult to see CP violation since we can't ignore the matter effect. I give a
simple expression for T violation in the presence of matter.
\\ (http://xxx.lanl.gov/abs/hep-ph/9701306 , 15kb)
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Paper: hep-ph/9701307
From: "Evgenii Feinberg" <fein...@td.lpi.ac.ru>
Date: Thu, 16 Jan 1997 15:17:25 +0300 (MSK)

Title: Transformation of the hadronic and subhadronic substances under extreme
conditions
Authors: E.L.Feinberg (Lebedev Physics Institute, Moscow)
Comments: 8 pages, 4 Postscript figures, 2 Tex figures; uses sprocl.sty
\\
Very dense and/or hot hadronic substance (e.g. the one with energy density
greatly exceeding that of a normal nucleus) transforms itself into a
subhadronic substance which obeys macroscopic classical physics, in particular
suffers phase transitions. The most popular Single Phase Transition Model
(SPTM) assumes that the new phase is the Quark Gluon Plasma (QGP) consisting of
deconfined, chiral symmetric, pointlike "current" quarks q and gluons g of
Quantum Chromodynamics (QCD). This paper is devoted to another, {\em Double}
Phase Transition Model (DPTM) according to which hadronic substance (H) and QGP
transform one into another via an intermediate phase consisting of deconfined
{\em constituent} massive quarks Q which for brevity sake we call also
equivalently valons (Q, valonic phase) with broken chiral symmetry (plus pions
as Goldstone particles). I. e. we consider the phase transformation chain
H-Q-QGP instead of usually assumed H-QGP. The phase transition H-Q is the
Hagedorn one and corresponds to the Hagedorn temperature. Connection with the
relativistic heavy ion collision is discussed. H-Q transformation may take
place even at low (e.g. Dubna) energies.
\\ (http://xxx.lanl.gov/abs/hep-ph/9701307 , 48kb)
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Paper: hep-ph/9701308
From: "Mikhail Kalmykov" <kalm...@thsun1.jinr.dubna.su>
Date: Thu, 16 Jan 1997 18:17:52

Title: Pole masses of quarks in dimensional reduction
Authors: L. V. Avdeev, M. Yu. Kalmykov
Comments: LaTeX, 18 pages, including 1 eps-figure
\\
Pole masses of quarks in quantum chromodynamics are calculated to the
two-loop order in the framework of the regularization by dimensional reduction.
For the diagram with a light quark loop, the non-Euclidean asymptotic expansion
is constructed with the external momentum on the mass shell of a heavy quark.
\\ (http://xxx.lanl.gov/abs/hep-ph/9701308 , 22kb)
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Paper: hep-ph/9701309
From: Martin Beneke <Martin...@cern.ch>
Date: Thu, 16 Jan 1997 18:18:15 +0100 (MET)

Title: Phenomenology of Power Corrections in Fragmentation Processes in e^+
e^- Annihilation
Authors: M. Beneke (CERN), V.M. Braun and L. Magnea (NORDITA)
Comments: 39 pages, LaTeX, 9 figures included via epsf.sty
Report-no: CERN-TH/96-362
\\
We analyse power corrections to longitudinal and transverse fragmentation
processes in e^+ e^- annihilation, based on the assumption of ultraviolet
dominance of power corrections. Under this assumption, we determine the
dependence of power corrections on the scaling variable x from the infrared
renormalon asymptotics of leading power coefficient functions. Our results
suggest that the longitudinal and transverse gluon fragmentation coefficient
functions receive corrections of order 1/(x Q)^2. The power expansion breaks
down at x<\Lambda/Q and has to be resummed. This resummation leads to 1/Q
corrections to the longitudinal and transverse cross section, which cancel for
the total cross section. We provide a simple parametrization of the x
dependence of 1/Q^2 corrections to fragmentation processes and investigate
perturbative corrections to the longitudinal cross section in higher orders, in
view of a determination of the strong coupling.
\\ (http://xxx.lanl.gov/abs/hep-ph/9701309 , 58kb)
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Paper: hep-ph/9701310
From: MAURO DONIZETI TONASSE <ton...@axp.ift.unesp.br>
Date: Thu, 16 Jan 1997 15:31:51 EST

Title: A vanishing cosmological constant in elementary particle theory
Author: F. Pisano and M. D. Tonasse
Comments: 15 pages, Revtex 3.0, no figures
Report-no: IFT-P.008/97
\\
The quest of a vanishing cosmological constant is considered in the simplest
anomaly-free chiral gauge extension of the electroweak standard model where the
new physics is limited to a well defined additional flavordynamics above the
Fermi scale, namely up to a few TeVs by matching the gauge coupling constants
at the electroweak scale, and with an extended scalarland. In contrast to the
electroweak standard model, it is shown how the extended scalar sector of the
theory allows a vanishing or a very small cosmological constant. The details of
the cancellation mechanism are presented. At accessible energies the theory is
indistinguishable from the standard model of elementary particles and it is in
agreement with all existing data.
\\ (http://xxx.lanl.gov/abs/hep-ph/9701310 , 12kb)
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Paper: hep-ph/9701311
From: Alexander Kusenko <alexande...@cern.ch>
Date: Thu, 16 Jan 1997 11:56:48 MST

Title: Neutral current induced neutrino oscillations in a supernova
Authors: Alexander Kusenko (CERN) and Gino Segre (University of Pennsilvania)
Comments: 6 pages, latex, postscript file is also available at
ftp://dept.physics.upenn.edu/pub/Kusenko/UPR729T.ps
Report-no: CERN-TH/97-5, UPR-729-T
\\
Neutral currents induced matter oscillations of electroweak-active
(anti-)neutrinos to sterile neutrinos can explain the observed motion of
pulsars. In contrast to a recently proposed explanation of the pulsar birth
velocities based on the electron to tau (muon) neutrino oscillations
[hep-ph/9606428], the heaviest neutrino (either active or sterile) would have
to have mass of order several keV.
\\ (http://xxx.lanl.gov/abs/hep-ph/9701311 , 7kb)
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Paper: hep-ph/9701312
From: ka...@mail.het.brown.edu (Kyungsik Kang)
Date: Thu, 16 Jan 1997 19:18:36 GMT

Title: Simple Model for Total Cross Sections
Authors: J.-H. Cudell, Kyungsik Kang, and Sung Ku Kim
Comments: 12 pages, postscript file. Presented at ``The State
of Physics at the End of the 20th Century" CARRUTHERS61(talk)
\\
Adopting the philosophy \`a la Donnachie and Landshoff that simple pole
exchanges could account for all data of total, elastic and diffractive
scattering cross sections to present energies, we show that such simple pole
fits to $pp$ and ${\bar p}p$ total cross sections are indeed very successful.
We assess the uncertainties of the various parameters by making careful
statistical analysis of the data and their correlations. In particular, the
pomeron intercept which controls total cross sections and the real part of the
elastic amplitude at high energies is shown to lie anywhere between 1.07 and
1.11, with a preferred value 1.096.
\\ (http://xxx.lanl.gov/abs/hep-ph/9701312 , 113kb)
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Paper: hep-ph/9701313
From: YU...@SLAC.Stanford.EDU
Date: Thu, 16 Jan 1997 11:45:49 -0800

Title: $K_L \to \pi^0 \nu \bar \nu$ Beyond the Standard Model
Authors: Yuval Grossman and Yosef Nir
Comments: 12 pages, revtex, no figures
Report-no: SLAC-PUB-7380, WIS-97/3/Jan-PH
\\
We analyze the decay $K_L \to \pi^0 \nu \bar \nu$ in a model independent way.
If lepton flavor is conserved the final state is (to a good approximation)
purely CP even. In that case this decay mode goes mainly through CP violating
interference between mixing and decay. Consequently, a theoretically clean
relation between the measured rate and electroweak parameters holds in any
given model. Specifically, $\Gamma(K_L \to \pi^0 \nu \bar \nu)/\Gamma(K^+ \to
\pi^+ \nu \bar \nu)= \sin^2\theta$ (up to known isospin corrections), where
$\theta$ is the relative CP violating phase between the $K-\bar K$ mixing
amplitude and the $s\to d\nu\bar\nu$ decay amplitude. The experimental bound on
$BR(K^+ \to \pi^+ \nu \bar \nu)$ provides a model independent upper bound:
$BR(K_L \to \pi^0 \nu \bar \nu) < 1.1 \times 10^{-8}$. In models with lepton
flavor violation, the final state is not necessarily a CP eigenstate. Then CP
conserving contributions can dominate the decay rate.
\\ (http://xxx.lanl.gov/abs/hep-ph/9701313 , 10kb)
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Paper: hep-ph/9701314
From: Andrea Erdas <er...@bohr.pha.jhu.edu>
Date: Thu, 16 Jan 97 17:43:17 -0500

Title: Magnetic properties of neutrinos in high temperature SU(2)XU(1) gauge
theory
Authors: A. Erdas, C. W. Kim, T. H. Lee
Comments: 13 pp, RevTeX, no figures
Report-no: JHU-TIPAC-97001 , KIAS-P97001
\\
We calculate the finite temperature self-energy for neutrinos in the presence
of a constant magnetic field in a medium in the unbroken $SU(2) \otimes U(1)$
model. We obtain the exact dispersion relation for such neutrinos and find that
the thermal effective mass is modified by the magnetic field. We also find a
simple analytic expression for the dispersion relation and obtain the index of
refraction for large neutrino momentum.
\\ (http://xxx.lanl.gov/abs/hep-ph/9701314 , 8kb)
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Paper: hep-ph/9701315
From: bhal...@theory.tifr.res.in (Rajeev Bhalerao)
Date: Thu, 16 Jan 97 10:10:33 -2359

Title: Apparent and Actual Shifts in Mass and Width of Phi Mesons Produced in
Heavy-Ion Collisions
Authors: R. S. Bhalerao and S. K. Gupta
Comments: 11 pages, latex, revtex; 3 Postscript figures; to appear in Modern
Phys. Lett. (A)
\\
We present a method of analyzing invariant-mass spectra of kaon pairs
resulting from decay of $\phi$ mesons produced in high-energy heavy-ion
collisions. It can be used to extract the shifts in the mass and the width
($\Delta M$ and $\Delta \Gamma$) of the $\phi$ mesons when they are inside the
dense matter formed in these collisions. We illustrate our method with the help
of available preliminary data. Extracted values of $\Delta M$ and $\Delta
\Gamma$ are significantly larger than those obtained with an earlier method.
Our results are consistent with the experimentally observed $p_T$ dependence of
the mass shift. Finally, we present a phenomenological relation between $\Delta
M$ and $\Delta \Gamma$. It provides a useful constraint on theories which
predict the values of these two quantities.
\\ (http://xxx.lanl.gov/abs/hep-ph/9701315 , 12kb)
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Paper (*cross-listing*): cond-mat/9612235
From: Motohiko Yoshimura <yos...@tuhep.phys.tohoku.ac.jp>
Date: Sat, 28 Dec 1996 14:12:46 +0900

Title: Quantum Dissipation in Open Harmonic Systems: Operator Solution
Authors: I. Joichi, Sh. Matsumoto, and M. Yoshimura
Comments: 15 pages, LATEX file with 2 PS figures.Figures also available at
ftp://tuhep.phys.tohoku.ac.jp/preprints/operator
Report-no: TU/96/514
Subj-class: Statistical Mechanics
\\
A finite number of harmonic oscillators coupled to infinitely many
environment oscillators is fundamental to the problem of understanding quantum
dissipation of a small system immersed in a large environment. Exact operator
solution as a function of time is given to this problem, by using diagonalized
dynamical variable of the entire system, the small system plus the environment.
The decay law of prepared initial configuration is worked out in greatest
detail. A clear separation of the exponential- and the power-law decay period
is made possible by our method. Behavior of physical quantities at
asymptotically late times can be understood in terms of the overlap probability
of the system variable with the diagonal variable of the entire system.
\\ (http://xxx.lanl.gov/abs/cond-mat/9612235 , 58kb)
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Paper (*cross-listing*): hep-th/9701005
From: Detlev Buchholz <buch...@kurims.kyoto-u.ac.jp>
Date: Fri, 3 Jan 1997 11:08:51 +0900 (JST)
Date (revised): Thu, 16 Jan 1997 07:46:50 +0900 (JST)
Date (revised): Thu, 16 Jan 1997 10:26:08 +0900 (JST)

Title: Spontaneous Collapse of Supersymmetry
Authors: Detlev Buchholz and Izumi Ojima
Comments: 22 pages, amslatex, minor changes in text, two references added
\\
It is shown that, if generators of supersymmetry transformations
(supercharges) can be defined in a spatially homogeneous physical state, then
this state describes the vacuum. Thus, supersymmetry is broken in any thermal
state and it is impossible to proceed from it by ``symmetrization'' to states
on which an action of supercharges can be defined. So, unlike the familiar
spontaneous breakdown of bosonic symmetries, there is a complete collapse of
supersymmetry in thermal states. It is also shown that spatially homogeneous
superthermal ensembles are never supersymmetric.
\\ (http://xxx.lanl.gov/abs/hep-th/9701005 , 16kb)
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Paper (*cross-listing*): hep-th/9701012
From: Reinhard Oehme <oe...@yukawa.uchicago.edu>
Date: Sun, 5 Jan 1997 10:14:18 -0600 (CST)

Title: Duality, Superconvergence and the Phases of Gauge Theories
Author: Reinhard Oehme
Comments: 20 pages, Latex
Report-no: EFI 96-42, MPI-Ph/96/82
\\
Results about the phase structure of certain N=1 supersymmetric gauge
theories, which have been obtained as a consequence of holomorphy and
`electric-magnetic' duality, are shown to be in quantitative agreement
with corresponding consequences of analyticity and superconvergence of the
gauge field propagator. This connection is of interest, because the
superconvergence arguments for confinement are not restricted to theories
with supersymmetry. The method of reduction in the space of coupling parameters
is used in order to define, beyond the matching conditions, an asymptotically
free, dual magnetic theory involving Yukawa couplings.
\\ (http://xxx.lanl.gov/abs/hep-th/9701012 , 12kb)
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Paper (*cross-listing*): nucl-th/9701026
From: Jochen Edelmann <Jochen_...@Physik.TU-Muenchen.DE>
Date: Wed, 15 Jan 1997 12:07:04 +0100

Title: Polarized deuteron structure functions at small x
Authors: J. Edelmann, G. Piller and W. Weise
Comments: 8 pages, Latex, 2 figures, to be published in Z. Phys. A
Report-no: TUM-T39-96-30
\\
We investigate shadowing corrections to the polarized deuteron structure
functions g_1^d and b_1. In the kinematic domain of current fixed target
experiments we observe that shadowing effects in g_1^d are approximately twice
as large as for the unpolarized structure function F_2^d. Furthermore, we find
that b_1 is surprisingly large at x < 0.1 and receives dominant contributions
from coherent double scattering.
\\ (http://xxx.lanl.gov/abs/nucl-th/9701026 , 14kb)
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Paper: hep-ph/9610275
replaced with revised version Thu, 16 Jan 97 08:08:07 +0100

Title: Renormalization of the three flavor Lagrangian in heavy baryon chiral
perturbation theory
Authors: G. M\"uller, Ulf-G. Mei{\ss}ner
Comments: 40 pp, LaTeX, 3 figs, uses epsf, slight changes in some equations and
phrasing, table 1 in more compact form, accepted for publication in Nucl.
Phys. B
Report-no: TK 96 24 and KFA-IKP(TH)-1996-07
\\ (http://xxx.lanl.gov/abs/hep-ph/9610275 , 37kb)
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Paper (*cross-listing*): hep-th/9610106
replaced with revised version Wed, 15 Jan 97 20:16:22 -0500

Title: A Classification of 3-Family Grand Unification in String Theory I. The
SO(10) and E_6 Models
Authors: Zurab Kakushadze and S.-H. Henry Tye
Comments: 35 pages, Revtex 3.0, one ps figure, the number of pages in this line
was incorrectly indicated in the previous version (to appear in Phys.Rev. D)
Report-no: Cornell preprint CLNS 96/1433, Harvard preprint HUTP-96/A048,
Northeastern preprint NUB 3145
\\ (http://xxx.lanl.gov/abs/hep-th/9610106 , 32kb)
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Paper (*cross-listing*): hep-th/9701057
replaced with revised version Wed, 15 Jan 97 20:03:19 -0500

Title: A Classification of 3-Family Grand Unification in String Theory II. The
SU(5) and SU(6) Models
Authors: Zurab Kakushadze and S.-H. Henry Tye
Comments: 29 pages, Revtex 3.0, one ps figure, the number of pages in this line
was incorrectly indicated in the previous version
Report-no: Cornell preprint CLNS 96/1458, Harvard preprint HUTP-96/A056,
Northeastern preprint NUB 3150
\\ (http://xxx.lanl.gov/abs/hep-th/9701057 , 25kb)
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Report-no: EFI-96-40
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