# QM 2011 - XXII International Conference on Ultrarelativistic Nucleus-Nucleus Collisions

May 22 – 28, 2011
Centre Bonlieu
Europe/Zurich timezone

## Jets, mach cone, hot spots, ridges, harmonic flow, dihadron and $\gamma$-hadron correlations in high-energy heavy-ion collisions

May 27, 2011, 4:40 PM
20m
Salon Verdi AB (Imperial Palace)

Parallel Jets

### Speaker

Dr Guo-Liang Ma (Shanghai Institute of Applied Physics, Chinese Academy of Sciences, P.O. Box 800-204, Shanghai 201800, China)

### Description

Within the AMPT Monte Carlo model, fluctuations in the initial transverse parton density are shown to lead to harmonic flows. The net back-to-back dihadron azimuthal correlation after subtraction of contributions from harmonic flows still has a double peak that is independent of the initial geometric triangularity and unique to the jet-induced Mach cone and expanding hot spots distorted by radial flow. The longitudinal structure of hot spots also leads to a near-side ridge in dihadron correlation with a large rapidity gap. By successively randomizing the azimuthal angle of the transverse momenta and positions of initial partons, one can isolate the effects of jet-induced medium excitation and expanding hot spots on the dihadron azimuthal correlation. The double peaks in the net dihadron and $\gamma$-hadron correlation are quantitatively different since the later is caused only by jet-induced Mach cone. Reference: [1] Guo-Liang Ma and Xin-Nian Wang, arXiv:1011.5249

### Primary authors

Dr Guo-Liang Ma (Shanghai Institute of Applied Physics, Chinese Academy of Sciences, P.O. Box 800-204, Shanghai 201800, China) Dr Xin-Nian Wang (Nuclear Science Division MS 70R0319, Lawrence Berkeley National Laboratory, Berkeley, California 94720)

 Slides