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

Abstract

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.

4 pages, 4 figures, presented at the 19th International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions, "Quark Matter 2008", Jaipur, India, February 4-10, 2008

References in corpus (5)

• Charged Particle Ratio Fluctuation as a Signal for QGP
• Multiplicity distribution and spectra of negatively charged hadrons in Au+Au collisions at sqrt(s_nn) = 130 GeV
• Charged-particle pseudorapidity density distributions from Au+Au collisions at sqrt(sNN)=130 GeV
• Narrowing of the Balance Function with Centrality in Au+Au Collisions at sqrt(sNN) = 130 GeV
• Net Charge Fluctuations in Au + Au Interactions at sqrt(s_NN) = 130 GeV