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arXiv · 1408.0495

Baseline for the cumulants of net-proton distributions at STAR

Xiaofeng Luo·Bedangadas Mohanty·Nu Xu
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Abstract

We present a systematic comparison between the recently measured cumulants of the net-proton distributions by STAR for 0-5% central Au+Au collisions at $\sqrt{s_{NN}}$=7.7-200 GeV and two kinds of possible baseline measures, the Poisson and Binomial baselines. These baseline measures are assuming that the proton and anti-proton distributions independently follow Poisson statistics or Binomial statistics. The higher order cumulant net-proton data are observed to deviate from all the baseline measures studied at 19.6 and 27 GeV. We also compare the net-proton with net-baryon fluctuations in UrQMD and AMPT model, and convert the net-proton fluctuations to net-baryon fluctuations in AMPT model by using a set of formula.

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Xiaofeng Luo, Bedangadas Mohanty, Nu Xu. 2014-11-26. Baseline for the cumulants of net-proton distributions at STAR. https://doi.org/10.1016/j.nuclphysa.2014.08.105

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