Campus Units

Physics and Astronomy

Document Type

Article

Publication Version

Published Version

Publication Date

10-2008

Journal or Book Title

Physical Review C

Volume

78

Issue

4

First Page

044902

DOI

10.1103/PhysRevC.78.044902

Abstract

A comprehensive survey of event-by-event fluctuations of charged hadron multiplicity in relativistic heavy ions is presented. The survey covers Au+Au collisions at s(NN)=62.4 and 200 GeV, and Cu+Cu collisions at s(NN)=22.5,62.4, and 200 GeV. Fluctuations are measured as a function of collision centrality, transverse momentum range, and charge sign. After correcting for nondynamical fluctuations due to fluctuations in the collision geometry within a centrality bin, the remaining dynamical fluctuations expressed as the variance normalized by the mean tend to decrease with increasing centrality. The dynamical fluctuations are consistent with or below the expectation from a superposition of participant nucleon-nucleon collisions based upon p+p data, indicating that this dataset does not exhibit evidence of critical behavior in terms of the compressibility of the system. A comparison of the data with a model where hadrons are independently emitted from a number of hadron clusters suggests that the mean number of hadrons per cluster is small in heavy ion collisions.

Comments

This article is published as Adare, A., S. S. Adler, S. Afanasiev, C. Aidala, N. N. Ajitanand, Y. Akiba, H. Al-Bataineh et al. "Charged hadron multiplicity fluctuations in Au+ Au and Cu+ Cu collisions from s NN= 22. 5 to 200 GeV." Physical Review C 78, no. 4 (2008): 044902. DOI:10.1103/PhysRevC.78.044902. Posted with permission.

Copyright Owner

American Physical Society

Language

en

File Format

application/pdf

Included in

Nuclear Commons

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