Resonances and fluctuations of strange particle in 200 GeV Au-Au collisions

Abstract

We perform an analysis of preliminary data on strange particles yields and fluctuations within the Statistical hadronization model. We begin by describing the theoretical disagreements between different statistical models currently on the market. We then show how the simultaneous analysis of yields and fluctuations can be used to differentiate between the different models, and determine if one of them can be connected to underlying physics. We perform a study on a RHIC 200 GeV data sample that includes stable particles, resonances, and the event-by-event fluctuation of the $K/\pi$ ratio. We show that the equilibrium statistical model can not describe the fluctuation, unless an unrealistically small volume is assumed. Such small volume then makes it impossible to describe the total particle multiplicity. The non-equilibrium model,on the other hand, describes both the $K/\pi$ fluctuation and yields acceptably due to the extra boost to the $\pi$ fluctuation provided by the high pion chemical potential. $\Lambda (1520)$ and $K^{\ast }$ abundance is described within error bars, but the ${\Sigma }^{\ast }$ is under-predicted to $\sim$ 1.5 standard deviations. We suggest further measurements that have the potential to test the non-equilibrium model, as well as gauge the effect of re-interactions between hadronization and freeze-out.

arXiv commentReferences added, equations corrected. As accepted for publication by Journal of Physics G

References in corpus (29)

• Experimental and Theoretical Challenges in the Search for the Quark Gluon Plasma: The STAR Collaboration's Critical Assessment of the Evidence from RHIC Collisions
• Hadron production in Au-Au collisions at RHIC
• Fluctuation Probes of Quark Deconfinement
• Identified particle distributions in pp and Au+Au collisions at sqrt{s_NN}=200 GeV
• Charged Particle Ratio Fluctuation as a Signal for QGP
• Chemical and Thermal Freeze-Out Parameters from 1 to 200 A.GeV
• First Measurement of the rho Spectral Function in High-Energy Nuclear Collisions
• Chemical equilibrium study in nucleus-nucleus collisions at relativistic energies
• Methods for the Study of Particle Production Fluctuations
• SHARE: Statistical Hadronization with Resonances
• Phi meson production in Au+Au and p+p collisions at sqrt (s)=200 GeV
• Canonical Description of Strangeness Enhancement from p-A to Pb-Pb Collisions
• Fluctuations of particle ratios and the abundance of hadronic resonances
• rho^0 Production and Possible Modification in Au+Au and p+p Collisions at sqrt(s_NN) = 200 GeV
• Strange hadron resonances as a signature of freeze-out dynamics
• Particle Number Fluctuations in Canonical Ensemble
• Multiplicity fluctuations in Au+Au collisions at $\sqrt{s_{NN}}=130$ GeV
• Hadron Production and Phase Changes in Relativistic Heavy Ion Collisions
• Strangeness Enhancement in Heavy Ion Collisions - Evidence for Quark-Gluon-Matter ?
• Dynamics and freeze-out of hadron resonances at RHIC
• Net Charge Fluctuations in Au + Au Interactions at sqrt(s_NN) = 130 GeV
• Centrality Dependence of Bulk Fireball Properties at RHIC
• Particle Number Fluctuations in High Energy Nucleus-Nucleus Collisions from Microscopic Transport Approaches
• Probing hadronization and freeze-out with multiple strange hadrons and strange resonances
• Search for QGP and Thermal Freeze-out of Strange Hadrons
• Probing collision dynamics at RHIC
• A comparison of statistical hadronization models
• Fluctuations and NA49
• Indications for the onset of deconfinement in nucleus nucleus collisions

Cited by in corpus (6)

• Bulk Viscosity driven clusterization of quark-gluon plasma and early freeze-out in relativistic heavy-ion collisions
• Multiplicity Distributions in Canonical and Microcanonical Statistical Ensembles
• Effects of a non-zero strangeness-chemical potential in strong interaction models
• Phenomenology of Strangeness enhancement in heavy ion collisions
• Fluctuations of particle ratios as a freeze-out probe
• What can we learn from fluctuations of particle ratios?