In the framework of a multi-phase transport model (AMPT) with both partonic and hadronic interactions, azimuthal correlations between trigger particles and associated scattering particles have been studied by the mixing-event technique. The momentum ranges of these particles are 3 < p has been observed in correlation functions for central collisions. By comparing scenarios with and without parton cascade and hadronic rescattering, we show that both partonic and hadronic dynamical mechanisms contribute to the Mach-like structure of the associated particle azimuthal correlations. The contribution of hadronic dynamical process can not be ignored in the emergence of Mach-like correlations of the soft scattered associated hadrons. However, hadronic rescattering alone cannot reproduce experimental amplitude of Mach-like cone on away-side, and the parton cascade process is essential to describe experimental amplitude of Mach-like cone on away-side. In addition, both the associated multiplicity and the sum of p T decrease, whileas the p T increases, with the impact parameter in the AMPT model including partonic dynamics from string melting scenario.
Based on A Multi-Phase Transport (AMPT) model, we have studied the elliptic flow v2 of φ mesons from reconstructed K + K − decay channel at the top Relativistic Heavy Ion Collider energy at Brookhaven National Laboratory. The dependences of v2 on transverse momentum pT and collision centrality are presented and the rescattering effect of φ mesons in the hadronic phase is also investigated. The results show that experimental measurement of v2 for φ mesons can retain the early collision information before φ decays and that the φ v2 value obeys the constituent quark number scaling which has been observed for other mesons and baryons. Our study indicates that the φ v2 mostly reflects partonic level collectivity developed during the early stage of the nucleusnucleus collision and the strange and light up/down quarks have developed similar angular anistropy properties at the hadronization.
We investigate hard photon production in a chemically equilibrating quark-gluons plasma with finite baryon density at one-loop and two-loop based on Jüttner distribution of partons of the system. We find that the photon yield increases obviously with increasing the initial quark chemical potential, and the photon production is dominated by early times. In addition, obvious difference between the calculated production and the one in the thermodynamic equilibrium system shows that the study of photon production in the chemically equilibrating system is very significant.
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