Beam-energy and system-size dependence of dynamical net charge fluctuations
Author(s)
Sakuma, Tai; Miller, M. L.; Millane, Julie M.; Kocoloski, Adam Philip; Jones, Christopher LaDon; Balewski, Jan T.; Surrow, Bernd; Hoffman, Alan Michael; ... Show more Show less
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We present measurements of net charge fluctuations in Au+Au collisions at √[subscript s[superscript [NN]]=19.6, 62.4, 130, and 200 GeV, Cu+Cu collisions at √[subscript s[superscript [NN]]=62.4 and 200 GeV, and p+p collisions at √s=200 GeV using the dynamical net charge fluctuations measure ν[subscript +-,dyn]. We observe that the dynamical fluctuations are nonzero at all energies and exhibit a modest dependence on beam energy. A weak system size dependence is also observed. We examine the collision centrality dependence of the net charge fluctuations and find that dynamical net charge fluctuations violate 1/N[subscript ch] scaling but display approximate 1/N[subscript part] scaling. We also study the azimuthal and rapidity dependence of the net charge correlation strength and observe strong dependence on the azimuthal angular range and pseudorapidity widths integrated to measure the correlation.
Date issued
2009-02Department
Lincoln Laboratory; Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear ScienceJournal
Physical Review C
Publisher
American Physical Society
Citation
STAR Collaboration et al. “Beam-energy and system-size dependence of dynamical net charge fluctuations.” Physical Review C 79.2 (2009): 024906. © 2009 The American Physical Society
Version: Final published version
ISSN
0556-2813