945 research outputs found
Enhancement of low- kaons in AGS heavy-ion collisions
In the relativistic transport model, we show that the recently observed
enhancement of low- kaons ( and ) in Si+Pb collisions at AGS can
be explained if a density isomer is introduced in the nuclear
equation-of-state.Comment: 12 pages, RevTex, 6 figs on request to [email protected]
Stereotyping based on voice in the presence of individuating information:Vocal femininity affects perceived competence but not warmth
Low-mass dileptons and dropping rho meson mass
Using the transport model, we have studied dilepton production from heavy-ion
collisions at Bevalac energies. It is found that the enhanced production of
low-mass dileptons observed in the experiment by the DLS collaboration cannot
be explained by the dropping of hadron masses, in particular the -meson
mass, in dense matter.Comment: 9 pages, LaTeX, including 1 postscript figure, to appear in Phys.
Lett.
Charm meson scattering cross sections by pion and rho meson
Using the local flavor SU(4) gauge invariance in the limit of vanishing
vector meson masses, we extend our previous study of charm meson scattering
cross sections by pion and rho meson, which is based only on the
pseudoscalar-pseudoscalar-vector meson couplings, to include also contributions
from the couplings among three vector mesons and among four particles. We find
that diagrams with light meson exchanges usually dominate the cross sections.
For the processes considered previously, the additional interactions lead only
to diagrams involving charm meson exchanges and contact interactions, and the
cross sections for these processes are thus not much affected. Nevertheless,
these additional interactions introduce new processes with light meson
exchanges and increase significantly the total scattering cross sections of
charm mesons by pion and rho meson.Comment: 14 pages, revtex, 6 figures, added a figure on the effects of
on-shell divergence, final version to appear in Nucl. Phys.
Hadron widths in mixed-phase matter
We derive classically an expression for a hadron width in a two-phase region
of hadron gas and quark-gluon plasma (QGP). The presence of QGP gives hadrons
larger widths than they would have in a pure hadron gas. We find that the
width observed in a central Au+Au collision at
GeV/nucleon is a few MeV greater than the width in a pure hadron gas. The part
of observed hadron widths due to QGP is approximately proportional to
.Comment: 8 pages, latex, no figures, KSUCNR-002-9
Thermal photon production in high-energy nuclear collisions
We use a boost-invariant one-dimensional (cylindrically symmetric) fluid
dynamics code to calculate thermal photon production in the central rapidity
region of S+Au and Pb+Pb collisions at SPS energy ( GeV/nucleon).
We assume that the hot matter is in thermal equilibrium throughout the
expansion, but consider deviations from chemical equilibrium in the high
temperature (deconfined) phase. We use equations of state with a first-order
phase transition between a massless pion gas and quark gluon plasma, with
transition temperatures in the range MeV.Comment: revised, now includes a_1 contribution. revtex, 10 pages plus 4
figures (uuencoded postscript
Excitation Functions of Stopping Power and Flow in Relativistic Heavy-Ion Collisions
Using a relativistic transport (ART) model, we study the stopping power, the
formation of superdense hadronic matter as well as the strength of transverse
and radial flow in central Au+Au collisions at beam momentum from 2 to 12 GeV/c
per nucleon. We find that complete stopping is achieved in the whole beam
momentum range. In particular, the proton rapidity distribution scaled by the
beam rapidity is independent of the beam momentum, and this is in agreement
with the experimental findings. Also, a large volume of superdense hadronic
matter with a local energy density exceeding that expected for the transition
of a hadronic matter to the quark-gluon plasma is formed in collisions at beam
momenta greater than 8 GeV/c per nucleon. Furthermore, it is found that the
transverse flow in these collisions is sensitive to the nuclear equation of
state and decreases with increasing beam momentum. On the other hand, the
radial flow is insensitive to the equation of state, and its strength increases
with beam momentum.Comment: Talk given at NN97, Gatlinburg, Tennessee June 2-6,1997. To appear in
the proc. in Nucl. Phys.
Can dileptons reveal the in-medium properties of vector mesons?
Dilepton production from both pion-pion and kaon-antikaon annihilation in
heavy-ion collisions is studied using the relativistic transport model. The
formation of a rho meson from pion-pion annihilation and a phi meson from
kaon-antikaon annihilation, their propagation in the medium, and their decay
into dileptons are explicitly treated. Including the medium modifications of
the masses and widths of vector mesons as predicted by the QCD sum-rule
calculations, we study their effects on the dilepton invariant mass spectra
from heavy-ion collisions at SIS/GSI energies.Comment: 22 pages, 11 figures available upon request to [email protected]
Phi meson production in relativistic heavy ion collisions
Within a multiphase transport model we study phi meson production in
relativistic heavy ion collisions from both superposition of initial multiple
proton-proton interactions and the secondary collisions in the produced
hadronic matter. The yield of phi mesons is then reconstructed from their
decaying product of either the kaon-antikaon pairs or the dimuon pairs. Since
the kaon-antikaon pairs at midrapidity with low transverse momenta are
predominantly rescattered or absorbed in the hadronic medium, they can not be
used to reconstruct the phi meson and lead thus to a smaller reconstructed phi
meson yield than that reconstructed from the dimuon channel. With in-medium
mass modifications of kaons and phi mesons, the phi yield from dimuons is
further enhanced compared to that from the kaon-antikaon pairs. The model
result is compared with the experimental data at the CERN/SPS and RHIC energies
and its implications to quark-gluon plasma formation are discussed.Comment: Revised version, to appear in Nucl. Phys.
Electromagnetic probes of dense matter in heavy-ion collisions
Dilepton and photon production in heavy-ion collisions at SPS energies are
studied in the relativistic transport model that incorporates self-consistently
the change of hadron masses in dense matter. It is found that the dilepton
spectra in proton-nucleus reactions can be well described by the conventional
mechanism of Dalitz decay and direct vector meson decay. However, to provide a
quantitative explanation of the observed dilepton spectra in central heavy-ion
collisions requires contributions other than these direct decays and also
various medium effects. Introducing a decrease of vector meson masses in hot
dense medium, we find that these heavy-ion data can be satisfactorily
explained. Furthermore, the single photon spectra in our calculations with
either free or in-medium meson masses do not exceed the upper bound deduced
from the experiments by the WA80 Collaboration.Comment: 8 pages, including 4 postscript figures. Talk presented at Sixth
International Conference on Nucleus-Nucleus Collisions (NN97), Gatlinburg,
June, 1997, to appear in the proceeding
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