Abstract
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 , with being a direct measure of fluctuation. In the limit of vanishing fluctuations, and Tsallis statistics converge to the usual BG. We evaluate the nonextensivity parameter and its dependence on the hadronizing system size from the experimentally observed collision centrality dependence of the mean multiplicity and its variance Var. We attribute the observed system size dependence of to the finiteness of the hadronizing source, with corresponding to an infinite, thermalized source with a fixed temperature, and with (which is observed) corresponding to a finite source in which both the temperature and energy fluctuate.
- Received 24 February 2009
DOI:https://doi.org/10.1103/PhysRevC.79.054903
©2009 American Physical Society