title: Mach cone induced by γ-triggered jets in high-energy heavy-ion collisions.
abstract: Medium excitation by jet shower propagation inside a quark-gluon plasma is studied within a linear Boltzmann transport and a multiphase transport model. Contrary to the naive expectation, it is the deflection of both the jet shower and the Mach-cone-like excitation in an expanding medium that is found to give rise to a double-peak azimuthal particle distribution with respect to the initial jet direction. Such a deflection is the strongest for hadron-triggered jets which are often produced close to the surface of a dense medium due to trigger bias and travel against or tangential to the radial flow. Without such trigger bias, the effect of deflection on γ-jet showers and their medium excitation is weaker. Comparative study of hadron and γ-triggered particle correlations can therefore reveal the dynamics of jet-induced medium excitation in high-energy heavy-ion collisions.
authors.affiliation: Institute of Particle Physics, Hua-Zhong Normal University, Wuhan 430079, China.
authors.forename: Hanlin
authors.initials: H
authors.lastname: Li
authors.forename: Fuming
authors.initials: F
authors.lastname: Liu
authors.forename: Guo-liang
authors.initials: GL
authors.lastname: Ma
authors.forename: Xin-Nian
authors.initials: XN
authors.lastname: Wang
authors.forename: Yan
authors.initials: Y
authors.lastname: Zhu