Poisson baseline of net-charge fluctuations in relativistic heavy ion collisions

被引：1

作者：

Pan, Xue ^{[1
]}

Lin, Yu-Fu ^{[2
,3
]}

Chen, Li-Zhu ^{[4
]}

Xu, Ming-Mei ^{[2
,3
]}

Wu, Yuan-Fang ^{[2
,3
]}

机构：

[1] Chengdu Technol Univ, Sch Elect Engn, Chengdu 611730, Sichuan, Peoples R China

[2] Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Hubei, Peoples R China

[3] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Hubei, Peoples R China

[4] Nanjing Univ Informat Sci & Technol, Sch Phys & Optoelect Engn, Nanjing 210044, Jiangsu, Peoples R China

来源：

CHINESE PHYSICS C | 2018年 / 42卷 / 07期

基金：

中国国家自然科学基金;

关键词：

net-charge fluctuations; Poisson baseline; High-order cumulants; PROTON; DISTRIBUTIONS;

D O I：

10.1088/1674-1137/42/7/074104

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

Taking doubly charged particles, positive-negative charge pair production and the effects of volume fluctuations into account, the Poisson baseline of the fluctuations of net-charge is studied. Within the Poisson baseline, the cumulants of net-charge are derived. Comparing to the Skellam baseline of net-charge, we infer that doubly charged particles broaden the distributions of net-charge, while positive-negative charge pairs narrow the distributions. Using the ratios of doubly charged particles and positive-negative charge pairs from neutral resonance decays to the total positive charges from THERMINATOR 2, the first four orders of moments and the corresponding moment products are calculated in the Poisson baseline for Au + Au collisions at root s(NN) = 200 GeV at RHIC/STAR. We find that the standard deviation is mainly influenced by the resonance decay, while the third and fourth order moments and corresponding moment products are mainly modified and fit the data of RHIC/STAR much better after including the effects of volume fluctuations.

引用

页数：7

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