Event by Event fluctuation in K/pi ratio at RHIC

Abstract

We present the preliminary results from our analysis of event by event fluctuation in K/pi ratio in Au+Au collision at \sqrt s_{NN} = 200 GeV and at 62.4 GeV using STAR detector at RHIC. Two different methods have been used to extract the strength of dynamical fluctuation and the centrality dependence of that. The results from the study of energy and centrality dependence of the dynamical fluctuation are presented. From the excitation function it is seen that at two RHIC energies the measure of dynamical fluctuation is constant with values very close to that at 12.3 GeV at SPS. The dynamical fluctuation is found to be positive and decreasing with increasing centrality at RHIC. The results are compared with HIJING model calculation with jets. Results from HIJING are found to be very close to data from central collisions whereas it over predicts the data for peripheral events.

arXiv comment4 pages, 3 figures, for ICPAQGP - 2005 (Recalculated the errors shown in Fig 2 and Table 1)

References in corpus (14)

• Signatures of the Tricritical Point in QCD
• Event-by-Event Fluctuations in Heavy Ion Collisions and the QCD Critical Point
• Energy Dependence of Pion and Kaon Production in Central Pb+Pb Collisions
• Fluctuation Probes of Quark Deconfinement
• Charged Particle Ratio Fluctuation as a Signal for QGP
• Methods for the Study of Particle Production Fluctuations
• Event-by-event physics in relativistic heavy ion collisions
• Fluctuations of particle ratios and the abundance of hadronic resonances
• Multiplicity fluctuations in Au+Au collisions at $\sqrt{s_{NN}}=130$ GeV
• Event-by-event fluctuations of the kaon to pion ratio in central Pb+Pb collisions at 158 GeV per Nucleon
• Kaon Production and Kaon to Pion Ratio in Au+Au Collisions at $\snn=130$ GeV
• Anomalous Multiplicity Fluctuations from Phase Transitions in Heavy Ion Collisions
• Event-by-Event Fluctuations of Particle Ratios in Central Pb+Pb Collisions at 20 to 158 AGeV
• Multiplicity and mean transverse momentum fluctuations in Au + Au collisions at RHIC

Cited by in corpus (4)

• Fluctuations of the $K/\pi$ Ratio in Nucleus-Nucleus Collisions: Statistical and Transport Models
• Particle Number Fluctuations and Correlations in Nucleus-Nucleus Collisions
• $K/\pi$, $K/p$ and $p/\pi$ Ratio Fluctuations within the HSD Transport Approach
• Some Considerations concerning the Fluctuation of the Ratios of two Observables