Multiplicity fluctuations due to the temperature fluctuations in high-energy nuclear collisions

被引：79

作者：

Wilk, Grzegorz ^{[1
]}

Wlodarczyk, Zbigniew ^{[2
]}

机构：

[1] Andrzej Soltan Inst Nucl Studies, PL-00681 Warsaw, Poland

[2] Jan Kochanowski Univ Humanities & Sci, Inst Phys, PL-25406 Kielce, Poland

来源：

PHYSICAL REVIEW C | 2009年 / 79卷 / 05期

关键词：

BY-EVENT FLUCTUATIONS; NONEXTENSIVE STATISTICS; TRANSVERSE-MOMENTUM; INFORMATION-THEORY; D+AU COLLISIONS; DISTRIBUTIONS; PARTICLE; SPECTRA; PHYSICS; P+P;

D O I：

10.1103/PhysRevC.79.054903

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：

We investigate the multiplicity fluctuations observed in high-energy nuclear collisions attributing them to intrinsic fluctuations of temperature of the hadronizing system formed in such processes. To account for these fluctuations, we replace the usual Boltzmann-Gibbs (BG) statistics by the nonextensive Tsallis statistics characterized by the nonextensivity parameter q, with |q-1| being a direct measure of fluctuation. In the limit of vanishing fluctuations, q -> 1 and Tsallis statistics converge to the usual BG. We evaluate the nonextensivity parameter q and its dependence on the hadronizing system size from the experimentally observed collision centrality dependence of the mean multiplicity < N > and its variance Var(N). We attribute the observed system size dependence of q to the finiteness of the hadronizing source, with q=1 corresponding to an infinite, thermalized source with a fixed temperature, and with q>1 (which is observed) corresponding to a finite source in which both the temperature and energy fluctuate.

引用

页数：10

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