Resonance-like QGP signals displayed in general charge balance functions

Experiment and lattice simulation show that the quark–gluon plasma (QGP) system displays strong interaction between constituents at temperature a few times the critical temperature T_c. This QGP picture can be explained by assuming that the QGP matter above T_c is rich in different kinds of bound states, namely resonance-like QGP (RQGP). The chemical composition of the QGP system produced in ultra-relativistic heavy-ion collisions can be investigated through a general charge balance function which describes two-wave quark production during expansion afterward. In this paper, we investigate the signals of this RQGP through general charge balance functions. We find that the quasiparticles in QGP contribute a little to the balance functions because of their heavy masses. The balance functions reduce to the situation discussed before where only one-wave charge production is involved if only the quasiparticles in QGP are considered. However, the baryonic bound states in QGP have a significant effect on the balance function B_pp¯(Δy), causing a dip in the pp¯ balance function at small Δy. The existence of the binary and baryonic bound states amplify the negative dip of the balance function B_pK^-(Δy) at Δy ∽ 1. (author)