9 research outputs found
Importance of reaction volume in hadronic collisions: Canonical enhancement
We study the canonical flavor enhancement arising from exact conservation of
strangeness, and charm flavor. Both the theoretical motivation, and the
practical consequences are explored. We argue using qualitative theoretical
arguments and quantitative evaluation, that this proposal to reevaluate
strangeness signature of quark--gluon plasma is not able to explain the
majority of available experimental results.Comment: 14 pages including 6 figures, submitted to Journal of Physics G
Presented at: Strange Quark Matter, September 2001, Frankfur
Strangeness Report
The paper provides a short report on strangeness production in
ultrarelativistic nucleus-nucleus collision, with the main stress on strange
particle abundances.Comment: Proceedings of Quark Matter 200
Rapidity distributions around mid-rapidity of strange particles in Pb-Pb collisions at 158 GeV/c
The production at central rapidity of K0s, Lambda, Xi and Omega particles in
Pb-Pb collisions at 158 A GeV/c has been measured by the NA57 experiment over a
centrality range corresponding to the most central 53% of the inelastic Pb-Pb
cross section. In this paper we present the rapidity distribution of each
particle in the central rapidity unit as a function of the event centrality.
The distributions are analyzed based on hydrodynamical models of the
collisions.Comment: 15 pages, 10 figure
Study of the transverse mass spectra of strange particles in Pb-Pb collisions at 158 A GeV/c
The NA57 experiment has collected high statistics, high purity samples of
\PKzS and \PgL, and hyperons produced in Pb-Pb collisions at 158
GeV/. In this paper we present a study of the transverse mass spectra of
these particles for a sample of events corresponding to the most central 53% of
the inelastic Pb-Pb cross-section. We analyse the transverse mass distributions
in the framework of the blast-wave model for the full sample and, for the first
time at the SPS, as a function of the event centrality.Comment: 22 pages, 14 figures, submitted to J. Phys. G: Nucl. Phy
Multiplicity of charged particles in Pb-Pb collisions at SPS energies
The multiplicity of charged particles in the central rapidity region has
been measured by the NA57 experiment in Pb-Pb collisions at the CERN SPS
at two beam momenta: 158 A GeV/c and 40 A GeV/c. The value of dN(ch)/d
eta at the maximum has been determined and its behaviour as a function
of centrality has been studied in the centrality range covered by NA57
(about 50% of the inelastic cross section). The multiplicity increase
is compatible with a logarithmic dependence on the centre of mass
energy. The results are compared with those from other experiments and
with the VENUS and RQMD models
Multiplicity of charged particles in Pb-Pb collisions at SPS energies
The multiplicity of charged particles in the central rapidity region has
been measured by the NA57 experiment in Pb-Pb collisions at the CERN SPS
at two beam momenta: 158 A GeV/c and 40 A GeV/c. The value of dN(ch)/d
eta at the maximum has been determined and studied as a function of
centrality within the range covered by NA57 (about 55% most central
part of the inelastic cross section). The central rapidity multiplicity
varies roughly linearly with the number of wounded nucleons
(participants) and increases approximately logarithmically with the
centre of mass energy