Beam-Energy and System-Size Dependence of Dynamical Net Charge Fluctuations

Details Beam-Energy and System-Size Dependence of Dynamical Net Charge Fluctuations Beam-Energy and System-Size Dependence of Dynamical Net Charge Fluctuations

2008-07-21

arxiv.org/abs/0807.3269v1

Phys.Rev.C79:024906,2009

Physics

Nuclear Physics

Nuclear Experiment

15 pages, 6 figures, STAR Collaboration

Scientific paper

10.1103/PhysRevC.79.024906

We present measurements of net charge fluctuations in $Au + Au$ collisions at $\sqrt{s_{NN}} = $ 19.6, 62.4, 130, and 200 GeV, $Cu + Cu$ collisions at $\sqrt{s_{NN}} = $ 62.4, 200 GeV, and $p + p$ collisions at $\sqrt{s} = $ 200 GeV using the dynamical net charge fluctuations measure $\nu_{+-{\rm,dyn}}$. We observe that the dynamical fluctuations are non-zero 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 $1/N_{ch}$ scaling, but display approximate $1/N_{part}$ 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.

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