Resonance-like QGP signals displayed in general charge balance functions

摘要

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 Tc. 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 heavymasses. 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 Bpp(Ay), causing a dip in the pp balance function at small Δ_y. The existence of the binary and baryonic bound states amplify the negative dip of the balance function B_pK-(Ay) at Δ_y ~ 1.