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received from Mon 6 Jan 97 01:00:03 GMT to Tue 7 Jan 97 01:00:01 GMT
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Paper: hep-ph/9701219
From: Mihoko Nojiri <noj...@theory.kek.jp>
Date: Mon, 06 Jan 1997 15:50:20 +0900
Title: Light Higgsino Dark Matter
Authors: M. Drees, M M. Nojiri, D.P. Roy and Y. Yamada
Comments: 21 pages,5 figures. Latex, use equation.sty axodraw.sty. Figures are
not included. The tex file and compressed postscript figures are available at
ftp://ftp.kek.jp/ kek/preprints/TH/TH-505/
Report-no: APCTP 96-06, KEK-TH 505, TIFR/TH/96-62, TU-515
\\
We re-investigate the question whether a light higgsino-like neutralino is
a viable Dark Matter candidate. To this end we compute the dominant one-loop
corrections to the masses of the higgsino-like states in the minimal
Supersymmetric Standard Model (MSSM), due to loops involving heavy quarks and
their superpartners. We also calculate analogous corrections to the couplings
of higgsino-like neutralinos to Z and Higgs bosons. In the region of parameter
space leading to high higgsino purity of the lightest neutralino, these
corrections can change the expected relic density by up to a factor of five in
either direction. We conclude that for favorable choices of soft supersymmetry
breaking parameters, a state with more than 99% higgsino purity could indeed
form all cold Dark Matter in the Universe. In some cases these corrections can
also increase the expected cross section for LSP scattering off spinless nuclei
by up to two orders of magnitude, or reduce it to zero.
\\ (http://xxx.lanl.gov/abs/hep-ph/9701219 , 25kb)
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Paper: hep-ph/9701220
From: yl...@itp.ac.cn (Wu Yue-liang)
Date: Mon, 6 Jan 1997 16:04:35 +0800 (CST)
Title: Nonfactorizable Contributions to Hadronic Matrix Elelments by Use of
Twist Wave Functions
Authors: W.F. Palmer (OSU) and Yue-Liang Wu (ITP)
Comments: 9 pages, Latex, no figures
Report-no: AS-ITP-97-01, DOE/ER/01545
\\
A general approach for evaluating the nonfactorizable contributions to the
hadronic matrix elements is described in terms of the higher twist wave
functions of the mesons. An example is illustrated for the $B^{0} \to
\pi^{+}\pi^{-}$ decays.
\\ (http://xxx.lanl.gov/abs/hep-ph/9701220 , 6kb)
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Paper: hep-ph/9701221
From: i0...@beta.ist.utl.pt
Date: Mon, 06 Jan 1997 09:26:42 EST
Title: A new type of spontaneous CP breaking
Author: L. Lavoura
Comments: plain LATEX, 12 pages, no figures and no tables
Report-no: FISIST/10-96/CFIF
\\
I present a new form of spontaneous CP violation in which, in analogy with
the left-right-symmetric model, CP breaking results from the inequality of two
real vacuum expectation values. In my model there is no scalar-pseudoscalar
mixing, and the smallness of strong CP violation finds a natural explanation.
\\ (http://xxx.lanl.gov/abs/hep-ph/9701221 , 7kb)
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Paper: hep-ph/9701222
From: f...@v2.rl.ac.uk (Frank Close)
Date: Mon, 6 Jan 1997 09:50:25 GMT
Title: A Glueball- $q\bar{q}$ Filter in Central Hadron Production
Authors: Frank Close and Andrew Kirk
Comments: Latex file. 5 figs including 2 from WA102 CERN report "A kinematical
selection of glueball candidates in central production"
Report-no: RAL-96-101; BHAM-HEP/96-04
\\
We have stumbled upon a remarkable empirical feature of central meson
production which separates established $q\bar{q}$ mesons from glueball
candidates. This does not appear to have been noted previously and we have no
simple explanation for it. We suggest that glueballs and $q\bar{q}$ of the same
$J^{PC}$ are distinguishable due to their boson versus fermion internal
structure and that this leads to a different topology for central production of
glueballs and $q\bar{q}$. Upon application of this test to data from the WA102
experiment we find that the $f_0(1500)$ and the $f_{2}(1900)$ show behaviour
consistent with glueballs and opposite to that exhibited by established
$q\bar{q}$ states.
\\ (http://xxx.lanl.gov/abs/hep-ph/9701222 , 31kb)
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Paper: hep-ph/9701223
From: Wojciech Florkowski <flor...@solaris.ifj.edu.pl>
Date: Mon, 6 Jan 1997 12:28:49 +0100
Title: Description of hot compressed hadronic matter based on an effective
chiral lagrangian
Authors: Wojciech Florkowski
Comments: 128 pages (35 figures), Latex, uses psfig
Report-no: INP 1739/PH
\\
A review of the recent results obtained in the Nambu -- Jona-Lasinio model is
given. In particular, the effect of screening of meson fields at finite
temperature or density is analyzed and the formulation of a chirally invariant
transport theory for quark matter is presented.
\\ (http://xxx.lanl.gov/abs/hep-ph/9701223 , 118kb)
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Paper: hep-ph/9701224
From: Mohammad Ahmady <ahm...@blackpepper.phys.ocha.ac.jp>
Date: Mon, 6 Jan 1997 21:52:25 +0900 (JST)
Title: Combined B->X_s\psi and B-> X_s\eta_c decays as a test of factorization
Authors: Mohammad R. Ahmady and Emi Kou (Ochanomizu University)
Comments: 9 pages, latex, no figures
Report-no: OCHA-PP-89
\\
We calculate the inclusive decays $B\to X_s\psi$ and $B\to X_s\eta_c$ using
factorization assumption. To investigate the bound state effect of the decaying
B meson in these inclusive decays we take into account the motion of the $b$
quark using a Gaussian momentum distribution model. The resulting correction to
free quark decay approximation is around 6% at most. Utilizing a potential
model evaluation of the ratio of the decay constants $f^2_{\eta_c}/f^2_\psi$,
it is shown that the ratio $R=\Gamma (B\to X_s\eta_c )/\Gamma (B\to X_s\psi )$
can be used as a possible test of factorization assumption.
\\ (http://xxx.lanl.gov/abs/hep-ph/9701224 , 7kb)
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Paper: hep-ph/9701225
From: golo...@phast.umass.edu
Date: Mon, 06 Jan 1997 09:08:39 -0500
Title: Charm Physics 1996 - A Retrospective
Author: Eugene Golowich
Comments: 11 pages, LaTeX, 5 figures, 7 tables. Invited talk at Fourth KEK
Topical Conference on Flavor Physics, 29-31 October 1996. To be published in
Nucl. Phys. B (Proc. Suppl.)
\\
A pedagogically oriented review is given of progress made over the past year
in our understanding of physics related to the charm quark. Included are
discussions of the R_c deficit, the \psi' anomaly, charm spectroscopy, D
nonleptonic decays, searches for flavor-changing neutral currents, new limits
on D^0 - {\bar D}^0 mixing and prospects for future experimental studies of the
charm sector.
\\ (http://xxx.lanl.gov/abs/hep-ph/9701225 , 47kb)
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Paper: hep-ph/9701226
From: kl...@bnlnth.phy.bnl.gov (Klaus Kinder-Geiger)
Date: Mon, 6 Jan 1997 13:51:29 -0500
Title: VNI-3.1: MC-simulation program to study high-energy particle collisions
in QCD by space-time evolution of parton-cascades and parton-hadron
conversion
Author: Klaus Geiger
Comments: 100 pages including 4 postscript figures
Report-no: BNL-63762
\\
VNI is a general-purpose Monte-Carlo event-generator, which includes the
simulation of lepton-lepton, lepton-hadron, lepton-nucleus, hadron-hadron,
hadron-nucleus, and nucleus-nucleus collisions. On the basis of
renormalization-group improved parton description and quantum-kinetic theory,
it uses the real-time evolution of parton cascades in conjunction with a
self-consistent hadronization scheme that is governed by the dynamics itself.
The causal evolution from a specific initial state (determined by the colliding
beam particles) is followed by the time-development of the phase-space
densities of partons, pre-hadronic parton clusters, and final-state hadrons, in
position-space, momentum-space and color-space. The parton-evolution is
described in terms of a space-time generalization of the familiar
momentum-space description of multipl (semi) hard interactions in QCD,
involving 2 -> 2 parton collisions, 2 -> 1 parton fusion processes, and 1 -> 2
radiation processes. The formation of color-singlet pre-hadronic clusters and
their decays into hadrons, on the other hand, is treated by using a spatial
criterion motivated by confinement and a non-perturbative model for
hadronization. This article gives a brief review of the physics underlying VNI,
which is followed by a detailed description of the program itself. The latter
program description emphasizes easy-to-use pragmatism and explains how to use
the program (including a simple example), annotates input and control
parameters, and discusses output data provided by it.
\\ (http://xxx.lanl.gov/abs/hep-ph/9701226 , 139kb)
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Paper: hep-ph/9701227
From: Xin-Nian Wang <xnw...@nsdssd.lbl.gov>
Date: Mon, 6 Jan 1997 12:06:48 MST
Title: Study Medium-induced Parton Energy Loss in Gamma+jet Events of
High-Energy Heavy-Ion Collisions
Authors: Xin-Nian Wang (LBNL) and Zheng Huang (U. of Arizona)
Comments: RevTex files with 14 embedded psfigures
Report-no: LBNL-39742
\\
The effect of medium-induced parton energy loss on jet fragmentation is
studied in high-energy heavy-ion collisions. It is shown that an effective jet
fragmentation function can be extracted from the inclusive $p_T$ spectrum of
charged particles in the opposite direction of a tagged direct photon with a
fixed transverse energy. We study the modification of the effective jet
fragmentation function due to parton energy loss in AA as compared to pp
collisions, including $E_T$ smearing from initial state radiations for the
photon-tagged jets. The effective fragmentation function at
$z=p_T/E_T^\gamma\sim 1$ in pA collisions is shown to be sensitive to the
additional $E_T$ smearing due to initial multiple parton scatterings whose
effect must be subtracted out in AA collisions in order to extract the
effective parton energy loss. Jet quenching in deeply inelastic lepton-nucleus
scatterings as a measure of the parton energy loss in cold nuclear matter is
also discussed. We also comment on the experimental feasibilities of the
proposed study at the RHIC and LHC energies and some alternative measurements
such as using $Z^0$ as a tag at the LHC energy.
\\ (http://xxx.lanl.gov/abs/hep-ph/9701227 , 124kb)
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Paper: hep-ph/9701228
From: Ed Stoeffhaas <e...@phenxe.physics.wisc.edu>
Date: Mon, 6 Jan 97 14:31:27 -0600
Title: Electroweak Interactions: Loops for Cyclists
Authors: F. Halzen
Comments: Lectures given at the IV Gleb Wataghin School on High Energy
Phenomena, UNICAMP, Brazil, July 1996. 27 pages, Latex, uses epsf.sty. 36
figures (most are small files, simple Feynman diagrams associated with the
equations). Postscript version of complete paper available at
http://phenom.physics.wisc.edu/pub/preprints/1996/madph-96-980.ps.Z or at
ftp://phenom.physics.wisc.edu/pub/preprints/1996/madph-96-980.ps.Z
Report-no: madph-96-980
\\
We review the ideas of renormalizable field theories and the Standard Model
at the Born (neutral currents, the Higgs mechanism and unification) and quantum
level. We subsequently illustrate how high statistics experiments are producing
the first evidence for the validity of the Standard Model as a spontaneously
broken gauge theory.
\\ (http://xxx.lanl.gov/abs/hep-ph/9701228 , 261kb)
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Paper: hep-ph/9701229
From: yu...@cuphyb.phys.columbia.edu (Yuri Kovchegov)
Date: Mon, 6 Jan 97 15:52:52 GMT
Title: Quantum structure of the non-Abelian Weizsacker-Williams field for a
very large nucleus
Authors: Yuri V. Kovchegov (Columbia University)
Comments: 13 pages, REVTeX, 9 figures
Report-no: CU-TP-807
\\
We consider the McLerran-Venugopalan model for calculation of the small-$x$
part of the gluon distribution function for a very large ultrarelativistic
nucleus at weak coupling. We construct the Feynman diagrams which correspond to
the classical Weizs\"{a}cker-Williams field found previously [Yu. V. Kovchegov,
Phys. Rev. D 54, 5463 (1996)] as a solution of the classical equations of
motion for the gluon field in the light-cone gauge. Analyzing these diagrams we
obtain a limit for the McLerran-Venugopalan model. We show that as long as this
limit is not violated a classical field can be used for calculation of
scattering amplitudes.
\\ (http://xxx.lanl.gov/abs/hep-ph/9701229 , 45kb)
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Paper: hep-ph/9701230
From: Xuemin Jin <j...@ctpa02.mit.edu>
Date: Mon, 6 Jan 1997 16:44:18 -0500
Title: Chirality and Reliability of Baryon QCD Sum Rules
Authors: Xuemin Jin and Jian Tang
Comments: 8 pages, ReVTeX, one figure embedded
Report-no: MIT-CTP-2601
\\
The QCD sum-rule method has been widely used in studying various baryon
properties. For a given problem, there are usually more than one sum rules and
they do not work equally well. In this paper, we point out that chirality plays
an important role in determining the reliability of a baryon sum rule. The
contributions of positive- and negative-parity excited baryon states partially
cancel each other in the chiral-odd sum rules, but add up in the chiral-even
sum rules. As such, the chiral-odd sum rules are generally more reliable than
the chiral-even sum rules. This allows one to identify the more reliable sum
rules and use them in extracting the ground-state baryon property of interest.
This is illustrated in an explicit example.
\\ (http://xxx.lanl.gov/abs/hep-ph/9701230 , 21kb)
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Paper: hep-ph/9701231
From: YU...@SLAC.Stanford.EDU
Date: Mon, 06 Jan 1997 14:43:41 -0800
Title: CP Violation Beyond the Standard Model
Authors: Yuval Grossman, Yosef Nir and Riccardo Rattazzi
Comments: 50 pages, harvmac, 1 figure. To appear in the Review Volume "Heavy
Flavours II", eds. A.J. Buras and M. Lindner, Advanced Series on Directions
in High Energy Physics, World Scientific Publishing Co., Singapore
Report-no: SLAC-PUB-7379, WIS-96/49/Dec-PH, CERN-TH/96-368
\\
We review CP violation in various extensions of the electroweak sector of the
Standard Model. A particular emphasis is put on supersymmetric models. We
describe the two CP problems of supersymmetry, concerning $d_N$ and
$\epsilon_K$. We critically review the various mechanisms that have been
suggested to solve these problems: exact universality, approximate CP symmetry,
alignment, approximate universality and heavy squarks. We explain how future
measurements of CP violation will test these mechanisms. We describe extensions
of the quark sector and their implications on CP asymmetries in neutral B
decays, on the $K_L \to \pi \nu \bar\nu$ decay and on $\Delta\Gamma(B_s)$. We
discuss CP violation in charged scalar exchange in models with natural flavor
conservation and explain how transverse lepton polarization in meson decays can
probe such models. CP violation in neutral scalar exchange arises in models of
horizontal symmetries and may be manifest in heavy quark (b and t) physics. We
describe the implications of Left-Right Symmetric models on $d_N$,
$\epsilon_K$, $\epsilon'/\epsilon$ and CP asymmetries in B decays. Finally, we
briefly discuss the potential of future measurements of CP violation to
discover New Physics.
\\ (http://xxx.lanl.gov/abs/hep-ph/9701231 , 47kb)
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Paper (*cross-listing*): astro-ph/9612214
From: Samar Abbas <ab...@iopb.ernet.in>
Date: Sun, 22 Dec 1996 14:57:22 +0500
Title: Volcanogenic Dark Matter and Mass Extinctions
Authors: Samar Abbas and Afsar Abbas
Comments: 6 pages in Latex file
Subj-class: Astrophysics; Geophysics
\\
The passage of the Earth through dense clumps of dark matter, the presence of
which are predicted by certain cosmologies, would produce large quantities of
heat in the interior of this planet through the capture and subsequent
annihilation of dark matter particles. This heat can cause large-scale
volcanism which could in turn have caused the extinction of the dinosaurs and
other mass extinctions. The periodicity of such volcanic outbursts agrees with
the frequency of palaeontological mass extinctions as well as the observed
periodicity in the occurrence of the largest flood basalt provinces on the
globe.
\\ (http://xxx.lanl.gov/abs/astro-ph/9612214 , 6kb)
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Paper (*cross-listing*): nucl-th/9701008
From: Hans Werner Hammer <hamm...@latte.phys.washington.edu>
Date: Fri, 3 Jan 1997 16:42:27 -0800 (PST)
Title: Contributions of strange quarks to the magnetic moment of the proton
Authors: H.-W. Hammer (INT, Seattle & Mainz U), D. Drechsel (Mainz U.) and T.
Mart (Mainz U.)
Comments: Latex, 10 pages, 2 Postscript figures, uses epsf.sty
Report-no: INT #DOE/ER/40561-306-INT96-00-159 & MKPH-T-96-19
\\
Using the Gerasimov-Drell-Hearn sum rule and experimental total cross
sections for photoproduction of $\eta$, $K$ and $\phi$ mesons on the proton, we
obtain upper bounds for the contribution of strange quarks to the anomalous
magnetic moment of the proton, $|\kappa_{s}| \le 0.20 \kappa_{p}$. The
proposed experiments to measure the spin-dependence of the absorption cross
section are expected to lower these bounds considerably. The existing data on
$\eta$ production and phenomenological models for $K$ production agree with a
negative sign for $\kappa_{s}$.
\\ (http://xxx.lanl.gov/abs/nucl-th/9701008 , 28kb)
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Paper: hep-ph/9606311
replaced with revised version Mon, 6 Jan 1997 14:00:00 +0200 (EET)
Title: Doubly charged Higgs at LHC
Authors: K.Huitu, J.Maalampi, A.Pietila and M.Raidal
Comments: Revised version, some results changed, to appear in NPB
Report-no: HU-SEFT R 1996-16
\\ (http://xxx.lanl.gov/abs/hep-ph/9606311 , 97kb)
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Paper: hep-ph/9610222
replaced with revised version Mon, 6 Jan 1997 10:03:10 -0600 (CST)
Title: Top Quark Mass
Author: Jonathan L. Rosner (CERN and University of Chicago)
Comments: 61 pages, latex, 26 figures. Some typos corrected
Report-no: CERN-TH-96/245, EFI-96-34
\\ (http://xxx.lanl.gov/abs/hep-ph/9610222 , 223kb)
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Paper: hep-ph/9610362
replaced with revised version Mon, 6 Jan 1997 10:10:23 +0100 (MET)
Title: Next to Leading Order QCD Corrections to Polarized $\Lambda$ Production
in DIS
Author: D. de Florian (CERN- TH Division) and R. Sassot (UBA, Argentina)
Comments: final version with few corrections, to be published in Nuc. Phys. B
Report-no: CERN-TH/96-261
\\ (http://xxx.lanl.gov/abs/hep-ph/9610362 , 27kb)
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Paper: hep-ph/9610390
replaced with revised version Mon, 6 Jan 1997 14:45:16 +0100 (MET)
Title: Probing the exchanged object(s) in diffractive scattering
Authors: C. Boros, Liang Zuo-tang and Meng Ta-chung
Report-no: FUB-HEP/96-11 (revised version)
\\ (http://xxx.lanl.gov/abs/hep-ph/9610390 , 20kb)
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Paper: hep-ph/9612282
replaced with revised version Mon, 6 Jan 97 16:57:10 PST
Title: Semi-Analytical Approaches to Local Electroweak Baryogenesis
Authors: Arthur Lue (MIT), Krishna Rajagopal (Caltech), Mark Trodden (MIT)
Comments: 31 pages, revtex, one figure, epsf, only change is one new reference
Report-no: MIT-CTP-2590,CALT-68-2089
\\ (http://xxx.lanl.gov/abs/hep-ph/9612282 , 26kb)
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Paper: hep-ph/9612402
replaced with revised version Mon, 6 Jan 1997 09:37:11 MST
Title: New Gauge Interactions and Single Top Quark Production
Authors: E.H. Simmons
Comments: 14 pages, 2 figures, LaTeX; one reference added
Report-no: BUHEP-96-37
\\ (http://xxx.lanl.gov/abs/hep-ph/9612402 , 19kb)
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Paper: hep-ph/9701218
replaced with revised version Mon, 6 Jan 1997 11:07:58 MSK-3MSD
Title: Exclusive nonleptonic decays of B mesons
Authors: D. Ebert, R.N. Faustov, V.O. Galkin
Comments: 20 pages, including 2 Latex and 4 PostScript figures
Report-no: HUB-EP-96/67
\\ (http://xxx.lanl.gov/abs/hep-ph/9701218 , 15kb)
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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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