# Quark Matter 2012

12-18 August 2012
US/Eastern timezone

## Incident Energy Dependence of Transverse Momentum Correlations in Au+Au collisions at $\sqrt{s_{NN}}$ = 7.7 -­ 200 GeV in STAR

16 Aug 2012, 16:00
2h

Poster Correlations and fluctuations

John Novak (M)

### Description

It has been proposed that one signal of the critical point could be a non-­monotonic change in the value of transverse momentum ( $p_t$ ) correlations as a function of centrality and/or incident energy [1]. Accordingly, we present results for two-­particle $p_t$ correlations as a function of event centrality for Au+Au collisions at $\sqrt{s_{NN}}$ = 7.7, 11.5, 19.6, 27, 39, 62.4 and 200 GeV at RHIC, extending our previous work [2] to lower incident energies. The $p_t$ correlations will be calculated as a function of centrality and collision energy. We will study the energy dependence of the square root of the correlations ( $\sqrt{\Delta p_{t,i}\Delta p_{t,j}}$ ) divided by the event-­‐wise average transverse momentum per event ( $<<p_t>>$ ). These results will be compared to measurements from other experiments as well as UrQMD model calculations. [1] H. Heiselberg, Phy. Rep. 351, 161 (2001) [2] STAR: Phys. Rev. C 72, 044902 (2005) [3] ALICE data: Stefan Heckel, Quark Matter 2011 [4] D. Adamova et al. [CERES Collaboration], Nucl. Phys. A727, 97 (2003)

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