hep-ph daily 9701207 -- 9701218 received (over 2598 served) 1626
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received from Fri 3 Jan 97 01:00:02 GMT to Mon 6 Jan 97 01:00:03 GMT
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Paper: hep-ph/9701207
From: Yao Xiaoxia <y...@hptc1.ihep.ac.cn>
Date: Fri, 3 Jan 1997 11:52:51 +0800 (EAT)
Title: A New Approach of J/psi suppression in pA and AA Collisions
Authors: Tai An, Chao Wei Qin and Yao Xiao Xia
Comments: 8 pages, latex, 2 figures
Report-no: BTHEP-TH-96-42
\\
When the cross section of J/psi production is considered varying with the
energy of the nucleon-nucleon interaction the production of J/psi in pA and
AA collisions has been studied using FRITIOF Model. The calculation shows that
the cross section of J/psi production "per nucleon-nucleon collision"
decreases with increasing mass number and centrality as a consequence of
continuous energy loss of the projectile nucleons to the target nucleons in
their successive binary nucleon-nucleon collisions . We have compared our model
predictions with the experimental data of J/psi production.
\\ (http://xxx.lanl.gov/abs/hep-ph/9701207 , 14kb)
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Paper: hep-ph/9701208
From: Lee Jungil <jun...@phya.snu.ac.kr>
Date: Fri, 3 Jan 1997 20:35:26 +0900 (KST)
Title: Color-octet mechanism and J/psi polarization at LEP
Authors: Seungwon Baek (Seoul National Univ.), P. Ko (Hong-Ik Univ.), Jungil
Lee and H.S. Song (Seoul National Univ.)
Comments: 15 pages, LaTeX, use epsfig.sty
Report-no: SNUTP-97-001
\\
Polarized heavy quarkonium productions in the Z^0 decays are considered. We
find that the polarizations of the produced quarkonia are independent of that
of the parent Z^0 provided that one considers the energy distribution or the
total production rate. Produced J/psi's via color-octet and color- singlet
mechanisms are expected to be 19% and 29% longitudinally polarized,
respectively. The energy dependence of eta_{1,8}(x)\equiv{dGamma_{1,8}^L/dx}
\over{d\Gamma_{1,8}/dx} is very sensitive to the production mechanism, and
therefore the measurement of eta(x)_{exp} will be an independent probe of the
color-octet mechanism.
\\ (http://xxx.lanl.gov/abs/hep-ph/9701208 , 21kb)
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Paper: hep-ph/9701209
From: Wojciech Florkowski <flor...@solaris.ifj.edu.pl>
Date: Fri, 3 Jan 1997 10:12:26 +0100
Title: Deep inelastic scattering of leptons from nuclear targets and the BFKL
pomeron
Authors: Andrzej Bialas, Wieslaw Czyz and Wojciech Florkowski
Comments: 13 pages (3 figures), RevTex, uses epsf
Report-no: TPJU - 25/96
\\
We calculate shadowing in the process of deep inelastic interactions of
leptons with nuclei in the perturbative regime of QCD. We find appreciable
shadowing for heavy nuclei (e.g. Pb) in the region of small Bjorken scaling
variable $10^{-5}\leq x \leq 10^{-3}$. This shadowing depends weakly on $Q^2$,
but it may be strongly influenced, especially at $x \geq 10^{-3}$, by the
existence of real parts of the forward scattering amplitudes.
\\ (http://xxx.lanl.gov/abs/hep-ph/9701209 , 21kb)
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Paper: hep-ph/9701210
From: m...@evalvx.ific.uv.es (Miguel Angel Sanchis-Lozano; IFIC (VALENCIA))
Date: Fri, 3 Jan 1997 10:59:07 +0200
Title: J/psi Production at the LHC
Authors: Miguel A. Sanchis-Lozano, Beatriz Cano-Coloma
Comments: 7 pages, LaTex, 4 Figures included in the text
Report-no: IFIC/97-1; FTUV/97-1
\\
We firstly re-examine hadroproduction of prompt J/psi's at the Fermilab
Tevatron finding that those colour-octet matrix elements presented in
literature are systematically overestimated due to the overlooking of the
effective primordial transverse momentum of partons (i.e. dynamically generated
via initial-state radiation). We estimate the size of these effects using
different parton distribution functions in a Monte Carlo framework. Finally, we
extrapolate up to LHC energies making a prediction on the expected pt
differential cross-section for charmonium.
\\ (http://xxx.lanl.gov/abs/hep-ph/9701210 , 16kb)
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Paper: hep-ph/9701211
From: Janusz Gluza <gl...@Server.Phys.US.edu.PL>
Date: Fri, 3 Jan 1997 16:40:19 +0100 (MET)
Title: Heavy neutrinos detection in the Next Linear Collider
Authors: J. Gluza (University of Silesia)
Comments: Ph.D. thesis, 80 pages
\\
The possibility of detecting heavy neutrinos (M_N>M_Z) in the NLC is
examined.
\\ (http://xxx.lanl.gov/abs/hep-ph/9701211 , 166kb)
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Paper: hep-ph/9701212
From: KOE...@dipmza.physik.Uni-Mainz.DE
Date: Fri, 03 Jan 1997 12:03:12 +0100
Title: Infinite Momentum Frame Calculation of Semileptonic Heavy
$\Lambda_b \to \Lambda_c$ Transitions Including HQET Improvements
Authors: B. K\"onig, J.G. K\"orner, M. Kr\"amer, P. Kroll
Comments: 24 pages, LaTeX, 6 figures are included in PostScript format.
Thoroughly revised version resubmitted to Phys.Rev.D
Report-no: DESY 93-011
\\
We calculate the transition form factors that occur in heavy $\Lambda$-type
baryon semileptonic decays as e.g. in $\Lambda_{b} \to \Lambda_{c}^{+} +
l^{-} + \overline{\nu}_{l}$. We use Bauer-Stech-Wirbel type infinite momentum
frame wave functions for the heavy $\Lambda$-type baryons which we assume to
consist of a heavy quark and a light spin-isospin zero diquark system. The
form factors at $q^{2} = 0$ are calculated from the overlap integrals of the
initial and final $\Lambda$-type baryon states. To leading order in the heavy
mass scale the structure of the form factors agrees with the HQET predictions
including the normalization at zero recoil. The leading order
$\omega$-dependence of the form factors is extracted by scaling arguments. By
comparing the model form factors with the HQET predictions at O(1/m_Q) we
obtain a consistent set of model form factors up to O(1/m_Q). With our
preferred choice of parameter values we find that the contribution of the
non-leading form factor is practically negligible. We use our form factor
predictions to compute rates, spectra and various asymmetry parameters for
the semi-leptonic decay $\Lambda_{b} \to \Lambda_{c}^{+} + l^{-} +
\overline{\nu}_{l}$.
\\ (http://xxx.lanl.gov/abs/hep-ph/9701212 , 69kb)
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Paper: hep-ph/9701213
From: crew...@butp.unibe.ch (Rod Crewther)
Date: Fri, 3 Jan 1997 15:43:56 +0100
Title: Measuring anomalous ``spin'' in elastic e-p or \nu-p and deep inelastic
e-p scattering
Authors: S. D. Bass (1), R. J. Crewther (2 and 3), F. M. Steffens (3 and 4), A.
W. Thomas (3) ((1) ITKP Bonn, (2) ITP Berne, (3) Adelaide, (4) Sao Paulo)
Comments: 11 pages, LaTeX 2.09, no figures
Report-no: TK-96-27, BUTP-96/30, ADP-96-46/T240
\\
We obtain a general rule that the O(1/log m_h) term due to the current
\bar{h}\gamma_\mu\gamma_5h of a mass-m_h quark h in f-flavour theory is
-3\bar{g}^2_f(m_h)/{2\pi^2(33-2f)} times the flavour singlet current of the
residual (f-1)-flavour theory, where \bar{g}_f is the f-flavour running
coupling constant in a mass-independent renormalization scheme. The rule is
applied to the Ellis-Jaffe moment below and well above charm threshold, and to
low-energy Z^0-exchange amplitudes. The singlet axial charge of the proton
common to these experiments is both scale and gauge invariant, but is related
to the axial anomaly and the ``gluon spin'' by a non-perturbative
renormalization factor.
\\ (http://xxx.lanl.gov/abs/hep-ph/9701213 , 12kb)
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Paper: hep-ph/9701214
From: Charles J. Horowitz <cha...@proteus.iucf.indiana.edu>
Date: Fri, 3 Jan 1997 12:27:13 MST
Title: Macroscopic Parity Violation and Supernova Asymmetries
Authors: C. J. Horowitz and J. Piekarewicz
Comments: Nine pages Revtex, two postscript figures (included)
Report-no: IU/NTC 96-18
\\
Core collapse supernovae are dominated by weakly interacting neutrinos. This
provides a unique opportunity for macroscopic parity violation. We speculate
that parity violation in a strong magnetic field can lead to an asymmetry in
the explosion and a recoil of the newly formed neutron star. We estimate the
asymmetry from neutrino-polarized-neutron elastic scattering, polarized
electron capture and neutrino-nucleus elastic scattering in a (partially)
polarized electron gas.
\\ (http://xxx.lanl.gov/abs/hep-ph/9701214 , 20kb)
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Paper: hep-ph/9701215
From: afa...@cebaf.gov (Andrei Afanas'ev)
Date: Fri, 3 Jan 1997 15:32:09 -0500
Title: Probing Polarized Parton Distributions with Meson Photoproduction
Author: Andrei Afanasev (Jefferson Lab and Hampton U.), Carl E. Carlson and
Christian Wahlquist (College of William and Mary)
Comments: RevTeX, 5 pages, 5 postscript figures
Report-no: JLab-THY-96-18
\\
Polarization asymmetries in photoproduction of high transverse momentum
mesons are a flavor sensitive way to measure the polarized quark distributions.
We calculate the expected asymmetries in several models, and find that the
asymmetries are significant and also significantly different from model to
model. Suitable data may come as a by-product of deep inelastic experiments to
measure $g_1$ or from dedicated experiments.
\\ (http://xxx.lanl.gov/abs/hep-ph/9701215 , 91kb)
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Paper: hep-ph/9701216
From: Steen Hannestad <s...@obs.aau.dk>
Date: Sat, 4 Jan 97 20:33:10 MET
Title: Can Neutrinos be Majorana Particles
Authors: Steen Hannestad
Comments: 2 pages, RevTex
\\
It was recently claimed that the observed physical neutrinos cannot be of
Majorana type because such particles lack vector interactions. Contrary to this
claim we show that if the Majorana neutrino is massless it is indistinguishable
from the Dirac neutrino so that observed physical neutrinos may equally well be
of Majorana or Dirac type.
\\ (http://xxx.lanl.gov/abs/hep-ph/9701216 , 3kb)
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Paper: hep-ph/9701217
From: Kiwoon CHOI <kc...@chep6.kaist.ac.kr>
Date: Sun, 5 Jan 97 4:54:38 EST
Title: Cosmology of Radiatively Generated Axion Scale
Authors: Kiwoon Choi (KAIST)
Comments: Talk given at the 2nd RESCEU International Symposium on "Dark Matter
in the Universe and its Direct Detection", Tokyo, Japan, 25-28 Nov., 1996,
LaTeX file, 6 pages
\\
We discuss some cosmological aspects of supersymmetric axion models in which
the axion scale is radiatively generated in terms of the weak scale and the
Planck scale. They include thermal inflation, axions produced by the decay of
oscillating Peccei-Quinn flatons, late time baryogenesis, and finally the
possibility to raise up the cosmological upper bound on the axion scale in
thermal inflation scenario.
\\ (http://xxx.lanl.gov/abs/hep-ph/9701217 , 5kb)
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Paper: hep-ph/9701218
From: "Vladimir Galkin" <V...@srdlan.npi.msu.su>
Date: Sun, 5 Jan 1997 13:58:44 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
\\
The energetic exclusive two-body nonleptonic decays of B mesons are
investigated in the framework of the relativistic quark model within the
factorization approximation. The heavy quark expansion is used for the
calculation of form factors. The obtained results are in agrement with
available experimental data.
\\ (http://xxx.lanl.gov/abs/hep-ph/9701218 , 15kb)
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Paper (*cross-listing*): astro-ph/9607013
From: John Bahcall <j...@IAS.EDU>
Date: Tue, 02 Jul 1996 14:14:10 EDT
Date (revised): Tue, 30 Jul 1996 17:02:06 EDT
Title: What Can Be Learned by Measuring the Fluxes of the 7-Be and the pep
Solar Neutrino Lines?
Authors: J. N. Bahcall and P. I. Krastev
Comments: 34 pages, RevTeX file. New and better quality figures. Figures are
available as one gziped uucompressed file (Lines.uu) from
ftp://ftp.sns.ias.edu/pub/krastev/Lines . Submitted to Physical Review D
\\
Measurements of the interaction rates of the solar neutrino lines of $^7$Be
and $pep$ can be used, independent of solar models, to test whether electron
flavor is conserved, to determine survival probabilities of electron-type
neutrinos at specific energies, and to test for the existence of sterile
neutrinos. We present analytic descriptions of these tests. We also illustrate
by numerical simulations, assuming matter-enhanced and vacuum neutrino
oscillations, what measurements of solar neutrino lines can teach us about
neutrino masses and mixing angles.
\\ (http://xxx.lanl.gov/abs/astro-ph/9607013 , 132kb)
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Paper: hep-ph/9610296
replaced with revised version Fri, 3 Jan 1997 17:13:45 +0000 (GMT)
Title: The Quasi-Infra-Red Fixed Point at Higher Loops
Authors: P.M. Ferreira, I. Jack and D.R.T. Jones
Comments: 12 pages, including 3 figures. Final version, to be published in
Phys. Lett. B, with minor typos corrected. Plain TeX. Uses Harvmac and epsf
Report-no: LTH 386
\\ (http://xxx.lanl.gov/abs/hep-ph/9610296 , 15kb)
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Paper: hep-ph/9612401
replaced with revised version Fri, 3 Jan 97 14:46:05 -0700
Title: Direct CP Violation Asymmetries in Exclusive B Decays in a
Bethe-Salpeter Approach
Authors: A.N.Kamal and C.W.Luo
Comments: 15 pages, Latex, 2 eps-figures. Signs of CP asymmetry in Tables 2 and
3 are reverse
Report-no: Alberta-Thy-43-96
\\ (http://xxx.lanl.gov/abs/hep-ph/9612401 , 29kb)
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Report-no: EFI-96-40
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