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

2008-06-25

arxiv.org/abs/0806.4166v1

Indian J.Phys.85:855-860,2011

Physics

Nuclear Physics

Nuclear Experiment

4 pages, 4 figures, presented at the 19th International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions, "Quark Ma

Scientific paper

10.1007/s12648-011-0089-4

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 net charge dynamical fluctuations measure $\nu_{+-,dyn}$. The dynamical fluctuations are non-zero at all energies and exhibit a rather modest dependence on beam energy. We find that at a given energy and collision system, net charge dynamical fluctuations violate $1/N_{ch}$ scaling, but display approximate $1/N_{part}$ scaling. We observe strong dependence of dynamical fluctuations on the azimuthal angular range and pseudorapidity widths.

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