Reaction Plane and Beam Energy Dependence Of The Balance Function at RHIC

Abstract

The balance function, which measures the correlation between opposite sign charge pairs, is sensitive to the mechanisms of charge formation and the subsequent relative diffusion of the balancing charges. The study of the balance function can provide information about charge creation time as well as the subsequent collective behavior of particles. In this paper, we present a reaction-plane-dependent balance function study for Au+Au collisions at $\sqrt{s_{\rm NN}}$ = 200 GeV and compare with results from recent three particle correlation measurements. We also report balance functions for relative pseudorapidity ($\Delta \eta$), relative rapidity ($\Delta y$), and relative azimuthal angle ($\Delta \phi$) from the recent RHIC beam energy scan data.