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Resonance-like QGP signals displayed in general charge balance functions

Ying-Hua Pan

Department of Physics, Harbin Institute of Technology, Harbin, Heilongjiang 150001, P. R. China

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and

Wei-Ning Zhang

Department of Physics, Harbin Institute of Technology, Harbin, Heilongjiang 150001, P. R. China

School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian, Liaoning 116024, P. R. China

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https://doi.org/10.1142/S0218301314500360Cited by:2 (Source: Crossref)

Abstract

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 , causing a dip in the 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.

Keywords:

PACS: 25.75.Dw, 25.75.Gz, 25.75.Nq, 25.75.-q

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