Time evolution of Mach-like structure in a partonic transport model

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The time evolution of Mach-like structure (the splitting of the away side peak in di-hadron Δϕ correlation) is presented in the framework of a dynamical partonic transport model. With the increasing of the lifetime of partonic matter, Mach-like structure can be produced and developed by strong parton cascade process. Not only the splitting parameter but also the number of associated hadrons (Nₕassoc) increases with the lifetime of partonic matter and partonic interaction cross section. Both the explosion of Nₕassoc following the formation of Mach-like structure and the corresponding results of three-particle correlation support that a partonic Mach-like shock wave can be formed by strong parton cascade mechanism. Therefore, the studies about Mach-like structure may give us some critical information, such as the lifetime of partonic matter and hadronization time.