May 13 – 19, 2018
Venice, Italy
Europe/Zurich timezone
The organisers warmly thank all participants for such a lively QM2018! See you in China in 2019!

Effect of Volume Fluctuation and Non-binomial Efficiency on the Cumulants of Net-proton Multiplicity Distributions at the STAR Experiment

May 15, 2018, 5:00 PM
2h 40m
First floor and third floor (Palazzo del Casinò)

First floor and third floor

Palazzo del Casinò

Poster Correlations and fluctuations Poster Session


Toshihiro Nonaka (Univ. Tsukuba)


Recent STAR results on net-proton cumulant ratio $C_{4}/C_{2}=\kappa\sigma^{2}$ show a non-monotonic behavior as a function of beam energy [1], which has been interpreted as a signature of the QCD critical end point. However, all previous STAR results were obtained with a binomial assumption for the efficiency correction. Unfolding of net-proton distributions is necessary in order to correct for non-binomial detector effects [2]. In addition, there are still no established ways for volume fluctuation corrections. Recently another model dependent method [3] has been suggested to eliminate the participant fluctuations. In this poster, we present the results of the unfolding method that attempts to correct for the non-binomial detector efficiencies and apply the new method for volume fluctuation corrections. The differences with respect to the previous results are discussed.

[1] Xiaofeng Luo (for the STAR collaboration), Proceedings, 9th International Workshop on Critical Point and Onset of Deconfinement (CPOD 2014), Vol. CPOD2014 (2015).
[2] A. Bzdak, R. Holzmann, and V. Koch, Phys. Rev. C94, 064907 (2016).
[3] P. Braun-Munzinger, A. Rustamov, and J. Stachel, Nucl. Phys. A960, 114130 (2017).

Collaboration STAR
Content type Experiment
Centralised submission by Collaboration Presenter name already specified

Primary author

Zhenyu Ye (University of Illinois at Chicago)

Presentation materials