Speaker
Mr
Zhiming Li
(Institute of Particle Physics, CCNU, Wuhan, China)
Description
Higher cumulants of baryon number are suggested to be good
probe of Critical Point of QCD phase transition in
relativistic heavy ion collisions [1]. However, since the
number of produced protons is still small at RHIC, it is
pointed out [2] that the statistical fluctuation is not
negligible, and should be subtracted from directly measured
cumulants. So the dynamical cumulant ratios are suggested.
Moreover, it is addressed that the sign of the dynamical net
proton kurtosis will change to be negative when the critical
point is approached from the crossover side of the phase
transition [3].
In this poster, we present the energy and centrality
dependence of dynamical net and total proton kurtosis
for Au + Au collisions at $\sqrt{s_{NN}}$ = 7.7,
11.5, 19.6, 27, 39, 62.4 and 200 GeV at RHIC. The sign of
dynamical kurtosis of net proton is discussed and compared
to those of total proton. The results are also compared with
AMPT model calculations.
References
[1] M. A. Stephanov, Phys. Rev. Lett. 102, 032301 (2009); R.
V. Gavai and S. Gupta, Phys. Lett. B 696 (2011) 459; C.
Athanasiou, et al., Phys. Rev. D 82, 074008 (2010).
[2] Lizhu Chen, et al., J. Phys. G: Nucl. Part. Phys. 38,
115004 (2011).
[3] M. Stephanov, Phys. Rev. Lett. 107, 052301 (2011).
Author
Mr
Zhiming Li
(Institute of Particle Physics, CCNU, Wuhan, China)
Co-author
Prof.
Yuanfang Wu
(Institute of Particle Physics, CCNU, Wuhan, China)
