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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} = $ 200GeV using the net charge dynamical fluctuations measure $\nu_{+-,dyn}$. Thedynamical fluctuations are non-zero at all energies and exhibit a rather modestdependence on beam energy. We find that at a given energy and collision system,net charge dynamical fluctuations violate $1/N_{ch}$ scaling, but displayapproximate $1/N_{part}$ scaling. We observe strong dependence of dynamicalfluctuations on the azimuthal angular range and pseudorapidity widths.

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