期刊
NUCLEAR PHYSICS A
卷 931, 期 -, 页码 808-813出版社
ELSEVIER
DOI: 10.1016/j.nuclphysa.2014.08.105
关键词
QCD critical point; Higher moments; Net-proton; Heavy-ion collision; Quantum chromodynamics
资金
- National Key Basic Research Program [2015CB856900]
- NSFC [11205067, 11221504, 11228513]
- China Post-doctoral Science Foundation [2012M511237, 2013T60732]
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 root S-NN = 7.7-200 GeV and two kinds of possible baseline measure, 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. (C) 2014 Elsevier B.V. All rights reserved.
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