2,617 research outputs found
Production of Strange Clusters and Strange Matter in Nucleus-Nucleus Collisions at the AGS
Production probabilities for strange clusters and strange matter in Au+Au
collisions at AGS energy are obtained in the thermal fireball model. The only
parameters of the model, the baryon chemical potential and temperature, were
determined from a description of the rather complete set of hadron yields from
Si+nucleus collisions at the AGS. For the production of light nuclear fragments
and strange clusters the results are similar to recent coalescence model
calculations. Strange matter production with baryon number larger than 10 is
predicted to be much smaller than any current experimental sensitivities.Comment: 9 Pages (no figures
Production of light nuclei, hypernuclei and their antiparticles in relativistic nuclear collisions
We present, using the statistical model, an analysis of the production of
light nuclei, hypernuclei and their antiparticles in central collisions of
heavy nuclei. Based on these studies we provide predictions for the production
yields of multiply-strange light nuclei.Comment: 9 pages, 6 figues; v2: final versions accepted for publication (Phys.
Lett. B
The thermal model on the verge of the ultimate test: particle production in Pb-Pb collisions at the LHC
We investigate the production of hadrons in nuclear collisions within the
framework of the thermal (or statistical hadronization) model. We discuss both
the ligh-quark hadrons as well as charmonium and provide predictions for the
LHC energy. Even as its exact magnitude is dependent on the charm production
cross section, not yet measured in Pb-Pb collisions, we can confidently predict
that at the LHC the nuclear modification factor of charmonium as a function of
centrality is larger than that observed at RHIC and compare the experimental
results to these predictions.Comment: 4 pages, 3 figures; proceedings of QM201
Centrality and Energy Dependence of Proton, Light Fragment and Hyperon Production
Recent results of the NA49 collaboration are discussed. These include the
energy dependence of stopping and the production of the light fragments t and
3He. New data on the system size dependence of hyperon production at 40A and
158AGeV are also presented.Comment: 4 pages, Quark Matter 2006 proceeding
Statistical Model Predictions for Particle Ratios at sqrt(s_NN) = 5.5 TeV
Particle production in central Pb-Pb collisions at LHC is discussed in the
context of the Statistical Model. Predictions of various particle ratios are
presented with the corresponding choice of model parameters made according to
the systematics extracted from heavy-ion collisions at lower energies. The
sensitivity of several ratios on the temperature and the baryon chemical
potential is studied in detail, and some of them, which are particularly
appropriate to determine the chemical freeze-out point experimentally, are
indicated. We show that the anti-p / p ratio is most suitable to determine the
baryon chemical potential while the Omega / K and Omega / pi ratios are best to
determine the temperature at chemical freeze-out.Comment: Submitted to Phys. Rev. C, 7 pages, 4 figure
Strange Particle Production from SIS to LHC
>1A review of meson emission in heavy ion collisions at incident energies
from SIS up to collider energies is presented. A statistical model assuming
chemical equilibrium and local strangeness conservation (i.e. strangeness
conservation per collision) explains most of the observed features.
Emphasis is put onto the study of and emission at low incident
energies. In the framework of this statistical model it is shown that the
experimentally observed equality of and rates at
``threshold-corrected'' energies is due to a
crossing of two excitation functions. Furthermore, the independence of the
to ratio on the number of participating nucleons observed between
SIS and RHIC is consistent with this model.
It is demonstrated that the production at SIS energies occurs
predominantly via strangeness exchange and this channel is approaching chemical
equilibrium. The observed maximum in the excitation function is
also seen in the ratio of strange to non-strange particle production. The
appearance of this maximum around 30 GeV is due to the energy
dependence of the chemical freeze-out parameters and .Comment: Presented at the International Workshop "On the Physics of the
Quark-Gluon Plasma", Palaiseau, France, September 2001. 10 pages, 8 figure
Heavy quark(onium) at LHC: the statistical hadronization case
We discuss the production of charmonium in nuclear collisions within the
framework of the statistical hadronization model. We demonstrate that the model
reproduces very well the availble data at RHIC. We provide predictions for the
LHC energy where, dependently on the charm production cross section, a
dramatically different behaviour of charmonium production as a function of
centrality might be expected. We discuss also the case in elementary
collisions, where clearly the statistical model does not reproduce the
measurements.Comment: 8 pages, 5 figures; proceeding of SQM09, Buzios, Brazil, to be
published in J. Phys.
Chemical Equilibrium in Collisions of Small Systems
The system-size dependence of particle production in heavy-ion collisions at
the top SPS energy is analyzed in terms of the statistical model. A systematic
comparison is made of two suppression mechanisms that quantify strange particle
yields in ultra-relativistic heavy-ion collisions: the canonical model with
strangeness correlation radius determined from the data and the model
formulated in the canonical ensemble using chemical off-equilibrium strangeness
suppression factor. The system-size dependence of the correlation radius and
the thermal parameters are obtained for p-p, C-C, Si-Si and Pb-Pb collisions at
sqrt(s_NN) = 17.3 AGeV. It is shown that on the basis of a consistent set of
data there is no clear difference between the two suppression patterns. In the
present study the strangeness correlation radius was found to exhibit a rather
weak dependence on the system size.Comment: 9 pages, 8 figures, submitted to Physical Review
Particle production in p-p collisions and prediction for LHC energy
We analyze recent data on particle production yields obtained in p-p
collisions at SPS and RHIC energies within the statistical model. We apply the
model formulated in the canonical ensemble and focus on strange particle
production. We introduce different methods to account for strangeness
suppression effects and discuss their phenomenological verification. We show
that at RHIC the midrapidity data on strange and multistrange particle
multiplicity can be successfully described by the canonical statistical model
with and without an extra suppression effects. On the other hand, SPS data
integrated over the full phase-space require an additional strangeness
suppression factor that is beyond the conventional canonical model. This factor
is quantified by the strangeness saturation parameter or strangeness
correlation volume. Extrapolating all relevant thermal parameters from SPS and
RHIC to LHC energy we present predictions of the statistical model for particle
yields in p-p collisions at sqrt(s) = 14TeV. We discuss the role and the
influence of a strangeness correlation volume on particle production in p-p
collisions at LHC.Comment: 6 pages, 6 figures, 4 tables, submitted to Phys. Rev.
Strangeness in ultrarelativistic nucleus-nucleus collisions
I discuss strangeness production in nucleus-nucleus reactions at
ultrarelativistic energies (up to 200 AGeV). In these reactions matter may be
created with densities and temperatures in the transition region between
quark-gluon plasma (QGP) and hadron gas. Strange anti-baryon enhancement at 200
AGeV and probably even more so at 10 AGeV signals importance of interactions
beyond hadron gas dynamics. The systematics of strangeness production indicates
that energy and baryon density are key variables while the size of the
production volume plays no visible role. Analysis of strangeness appears useful
to explore thermalization, flow and the post-equilibrium stage in
ultrarelativistic nucleus-nucleus collisions.Comment: 13 pages LaTeX including 6 postscript figures; needs style files
espcrc1,floatfig,epsfig. Invited talk presented at 6th International
Conference on Nucleus-Nucleus Collisions at Gatlinburg, June 2-6, 1997. To be
published in Proceedings in Nuclear Physics
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