Collective dynamics in dijet+QGP-fluid system*

Compared with p+p collisions, dijet imbalance is enhanced in ultra-relativistic heavy-ion collisions as a consequence of jet quenching. Enhancement of low-$p_T$ particles distributed upto large angle from jet axes is observed by the CMS collaboration at LHC [1]. A large fraction of the di-jet momentum imbalance is compensated by these low-$p_T$ particles. On the other hand, according to recent results from the STAR collaboration, the dijet $p_T$-balance is restored by low-$pT$ particles closer to the jet direction at RHIC[2]. Motivated by these latest results, the dynamical transport process of energy and momentum deposited from jets traversing expanding QGP-fluid is studied. We perform simulations of dijet asymmetric events in ultra-relativistic heavy-ion collisions. By solving relativistic hydrodynamic equations with source terms in fully (3+1)-dimensional Milne coordinates, we describe the collective flow in dijet+QGP-fluid system. We calculate the $p_T$ distribution around dijet to interpret the events with large dijet imbalance both at LHC and at RHIC. \\[4pt] [1] Doga Gulhan [CMS Collaboration], talk at Quark Matter 2014. \\[0pt] [2] J\"orn Putschke [STAR Collaboration], talk at Quark Matter 2014.