Dihadron and gamma-hadron correlations from jet-induced medium excitation in high-energy heavy-ion collisions

Details Dihadron and gamma-hadron correlations from jet-induced medium excitation in high-energy heavy-ion collisions Dihadron and gamma-hadron correlations from jet-induced medium excitation in high-energy heavy-ion collisions

2010-12-12

arxiv.org/abs/1012.2584v1

Physics

Nuclear Physics

Nuclear Theory

4 pages with 6 figures, proceedings for the Hard Probes 2010 Conference

Scientific paper

Jet propagation is shown to produce Mach-cone-like medium excitation inside a quark-gluon plasma. However, only deflection of such medium excitation and jet shower partons by radial flow leads to double-peaked dihadron correlation in high-energy heavy-ion collisions. Dihadron correlations from harmonic flow, hot spots and dijets are studied separately within the AMPT Monte Carlo model and all lead to double-peaked dihadron azimuthal correlation. The $\gamma$-hadron correlation has similar double-peak feature but is free of the contributions from harmonic flow and hot spots. Dihadron and $\gamma$-hadron correlations are compared to shed light on jet-induced medium excitation and hot spots in an expanding medium.

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