64,123 research outputs found
Strangeness Chemical Equilibration in QGP at RHIC and LHC
We study, in the dynamically evolving QGP fireball formed in relativistic
heavy ion collisions at RHIC and LHC, the growth of strangeness yield toward
and beyond the chemical equilibrium. We account for the contribution of the
direct strangeness production and evaluate the thermal-QCD strangeness
production mechanisms. The specific yield of strangeness per entropy, s/S, is
the primary target variable. We explore the effect of collision impact
parameter, i.e., fireball size, on kinetic strangeness chemical equilibration
in QGP. Insights gained in study the RHIC data with regard to the dynamics of
the fireball are applied to the study strangeness production at the LHC. We use
these results and consider the strange hadron relative particle yields at RHIC
and LHC in a systematic fashion. We consider both the dependence on s/S and
directly participant number dependence.Comment: 21 pages, 13 figures, PRC in press. Strangeness production recomputed
with K-factor K=1.7. Particle yields recomputed with SHARE 2.
Strangeness Production in Chemically Non-Equilibrated Parton Plasma
Strangeness production was investigated during the equilibration of a gluon
dominated parton plasma produced at RHIC and LHC energies. The time evolution
of parton densities are followed by a set of rate equations in a 1-dimensional
expanding system. The strangeness production will depend on the initial
chemical equilibration level and in our case the parton densities will remain
far from the full equilibrium. We investigate the influence of gluon
fragmentation on final strangeness content.Comment: 12 pages (LaTeX) + 2 postscript figures (tarred, compressed,
uuencoded) included. Review to appear in Proceedings of Strangeness'95,
Tucson, Arizona, Jan. 4--6 1995. (American Institute of Physics
Strangeness Content in the Nucleon
I review recent studies of strangeness content in the nucleon pertaining to
the flavor-singlet , the matrix element and the strangeness
electric and magnetic form factors and , based on
lattice QCD calculations. I shall also discuss the relevance of incorporating
the strangeness content in nuclei in regard to strange baryon-antibaryon
productions from proton-nucleus and nucleus-nucleus collisions at SPS and RHIC
energies.Comment: 11 pages, 4 figures, Invited talk at V Int. Conf. on Strangeness in
Quark Matter, Berkeley, CA, July 20--25, 200
Strangeness Production in Nuclear Matter and Expansion Dynamics
Thermodynamical properties of hot and dense nuclear matter are analyzed and
compared for different equation of state (EoS). It is argued that the softest
point of the equation of state and the strangeness separation on the phase
boundary can manifest themselves in observables. The influence of the EoS and
the order of the phase transition on the expansion dynamics of nuclear matter
and strangeness excitation function is analyzed. It is shown that bulk
properties of strangeness production in A-A collisions depend only weakly on
the particular form of the EoS. The predictions of different models are related
with experimental data on strangeness production.Comment: 38 page
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