3,716 research outputs found
Statistical Model and the mesonic-baryonic transition region
The statistical model assuming chemical equilibriumand local strangeness
conservation describes most of the observed features of strange particle
production from SIS up to RHIC. Deviations are found as the maximum in the
measured K+/pi+ ratio is much sharper than in the model calculations. At the
incident energy of the maximum, the statistical model shows that freeze out
changes regime from one being dominated by baryons at the lower energies toward
one being dominated by mesons. It will be shown how deviations from the usual
freeze-out curve influence the various particle ratios. Furthermore, other
observables exhibit also changes just in this energy regime.Comment: 9 pages, 7 figures, CPOD conference proceeding
Density fluctuations and a first-order chiral phase transition in non-equilibrium
The thermodynamics of a first-order chiral phase transition is considered in
the presence of spinodal phase separation using the Nambu-Jona-Lasinio model in
the mean field approximation. We focus on the behavior of conserved charge
fluctuations. We show that in non-equilibrium the specific heat and charge
susceptibilities diverge as the system crosses the isothermal spinodal lines.Comment: 4 pages, 1 figure, to appear in the proceedings of Chiral07, November
13-16 2007, Osaka, Japa
Statistical Model Predictions for p+p and Pb+Pb Collisions at LHC
Particle production in p+p and central Pb+Pb collisions at LHC is discussed
in the context of the statistical thermal model. For heavy-ion collisions,
predictions of various particle ratios are presented. 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. Considering
elementary interactions on the other hand, we focus on strangeness production
and its possible suppression. Extrapolating the thermal parameters to LHC
energy, we present predictions of the statistical model for particle yields in
p+p collisions. We quantify the strangeness suppression by the correlation
volume parameter and discuss its influence on particle production. We propose
observables that can provide deeper insight into the mechanism of strangeness
production and suppression at LHC.Comment: 7 pages, 5 figures, conference contribution to "International school
of nuclear physics", Erice, Sicily, 16 - 24 September 2008; Progress in
Particle and Nuclear Physics, 2009, in pres
Thermodynamic limit and semi--intensive quantities
The properties of statistical ensembles with abelian charges close to the
thermodynamic limit are discussed. The finite volume corrections to the
probability distributions and particle density moments are calculated. Results
are obtained for statistical ensembles with both exact and average charge
conservation. A new class of variables (semi--intensive variables) which differ
in the thermodynamic limit depending on how charge conservation is implemented
in the system is introduced. The thermodynamic limit behavior of these
variables is calculated through the next to leading order finite volume
corrections to the corresponding probability density distributions.Comment: 11 pages, 2 figures In v2 figures are added and corresponding
editorial changes are done. Paper will be published in Journal of Physics
Remarks on combinatorial aspects of the KP Equation
Accepted for publication: AIP Conference Proceedings, 2nd International Workshop on Nonlinear and Modern Mathematical Physics, March 9-11, 2013. v2: Several clarifications made, references added, typos corrected; 16 pages, 1 figureAccepted for publication: AIP Conference Proceedings, 2nd International Workshop on Nonlinear and Modern Mathematical Physics, March 9-11, 2013. v2: Several clarifications made, references added, typos corrected; 16 pages, 1 figureAccepted for publication: AIP Conference Proceedings, 2nd International Workshop on Nonlinear and Modern Mathematical Physics, March 9-11, 2013. v2: Several clarifications made, references added, typos corrected; 16 pages, 1 figureAccepted for publication: AIP Conference Proceedings, 2nd International Workshop on Nonlinear and Modern Mathematical Physics, March 9-11, 2013. v2: Several clarifications made, references added, typos corrected; 16 pages, 1 figureNSF through grant DMS-0807705; AR is supported by the NSF under grant DMS-100438
Statistical Model Predictions for Pb-Pb Collisions at LHC
The systematics of Statistical Model parameters extracted from heavy-ion
collisions at lower energies are exploited to extrapolate in the LHC regime.
Predictions of various particle ratios are presented and particle production in
central Pb-Pb collisions at LHC is discussed in the context of the Statistical
Model. 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. The impact of feed-down contributions from
resonances, especially to light hadrons, is illustrated.Comment: 5 pages, 2 figures, 1 table, SQM 2006 conference proceedings,
accepted for publication in J. Phys.
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
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