Study of Dynamical $K/\pi$ and $p/\pi$ Fluctuations in $\sqrt{s_{NN}}$ = 22.4 GeV Cu+Cu Collisions from the STAR Experiment

Abstract

Results from the measurement of dynamical $K/\pi$ and $p/\pi$ ratio fluctuations are presented. Dynamical fluctuations in global conserved quantities such as baryon number, strangeness, or charge may be observed near a QCD critical point. The first measurement of results of $K/\pi$ and $p/\pi$ fluctuations from Cu+Cu collisions at an energy $\sqrt{s_{NN}}$ = 22.4 GeV are shown. This energy range is close to the top SPS energy and has garnered additional interest due to the proposed QCD critical point search at RHIC. The new Cu+Cu data is compared to previous results from Au+Au collisions at the energies $\sqrt{s_{NN}}$ = 19.6, 62.4, 130, and 200 GeV, and to measurements from the NA49 experiment. The dynamical $K/\pi$ fluctuation results from Cu+Cu at $\sqrt{s_{NN}}$ = 22.4 GeV are in good agreement with previous measurements from the STAR and NA49 experiments near that energy. Results are compared to theoretical predictions from several models including the HIJING and UrQMD models.

7 pages, 3 figures. Proceedings of the International Conference on Strangeness in Quark Matter 2009 (SQM2009), Buzios, Brazil, September 27 - October 2, 2009

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Cited by in corpus (1)

• Some Considerations concerning the Fluctuation of the Ratios of two Observables