### Session DA: Ultrarelativistic Heavy Ions I

10:30 AM–12:30 PM, Thursday, October 27, 2011
Room: 62

Chair: Fuqian Wang, Purdue University

Abstract ID: BAPS.2011.DNP.DA.5

### Abstract: DA.00005 : Dynamical $K/\pi$, $p/\pi$, and $K/p$ Fluctuations in $\sqrt{s_{NN}}$ = 7.7-200 GeV Au+Au Collisions

11:18 AM–11:30 AM

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#### Author:

Terence Tarnowsky
(Michigan State University)

Dynamical fluctuations in global conserved quantities such as baryon number, strangeness, or charge may be observed near a QCD critical point. Results from new measurements of dynamical $K/\pi$, $p/\pi$, and $K/p$ ratio fluctuations are presented. The commencing of a QCD critical point search at RHIC has extended the reach of possible measurements of dynamical $K/\pi$, $p/\pi$, and $K/p$ ratio fluctuations from Au+Au collisions to lower energies. The STAR experiment has performed a comprehensive study of the energy dependence of these dynamical fluctuations in Au+Au collisions at the energies $\sqrt{s_{NN}}$ = 7.7, 11.5, 39, 62.4, and 200 GeV. New results are compared to previous measurements and to theoretical predictions from several models. The measured dynamical $K/\pi$ fluctuations are found be independent of collision energy, while dynamical $p/\pi$ and $K/p$ fluctuations have a negative value that increases toward zero at top RHIC energy.

To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2011.DNP.DA.5