Di-hadron and Tri-hadron correlation and Mach-like cone structure
Y. G. Ma, G. L. Ma, S. Zhang, X. Z. Cai, J. H. Chen, Z. J. He, H. Z. Huang, J. L. Long, W. Q. Shen, X. H. Shi, J. X. Zuo
Abstract
In a framework of a multi-phase transport model with both partonic and hadronic interactions, azimuthal correlations between trigger particles and associated scattering particles in Au + Au collisions at sNN = 200 GeV/c have been studied by the mixing-event technique. The Mach-like structure has been observed in correlation function for central collisions. It is shown that the Mach-like structure is basically born in the partonic process and further developed in hadronic rescattering process. However, hadronic rescattering alone cannot reproduce the amplitude of Mach-like cone on away side, therefore partonic cascade process is necessary to describe the amplitude of Mach-like cone on away side in experiment. In addition, three-particle correlations have been investigated in central Au + Au collisions with the AMPT model, and the results support the conclusion that partonic cascade processes enhance the opening angle of Mach-like cone structures.
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