Chaudhuri A K, Heinz Ulrich
Variable Energy Cyclotron Centre, 1-AF, Bidhan Nagar, Kolkata-700 064, India.
Phys Rev Lett. 2006 Aug 11;97(6):062301. doi: 10.1103/PhysRevLett.97.062301. Epub 2006 Aug 9.
We study the effects of jet quenching on the hydrodynamical evolution of the quark-gluon plasma (QGP) fluid created in a heavy-ion collision. In jet quenching, a hard QCD parton, before fragmenting into a jet of hadrons, deposits a fraction of its energy in the medium, leading to suppressed production of high-pT hadrons. Assuming that the deposited energy quickly thermalizes, we simulate the subsequent hydrodynamic evolution of the QGP fluid. For partons moving at supersonic speed, vp>cs, and sufficiently large energy loss, a shock wave forms leading to conical flow. The PHENIX Collaboration recently suggested that observed structures in the azimuthal angle distribution might be caused by conical flow. We show here that, for phenomenologically acceptable values of parton energy loss, conical flow effects are too weak to explain these structures.
我们研究了喷注淬火对重离子碰撞中产生的夸克-胶子等离子体（QGP）流体的流体动力学演化的影响。在喷注淬火过程中，一个硬QCD部分子在碎裂成强子喷注之前，会将其一部分能量沉积在介质中，导致高横动量强子的产生受到抑制。假设沉积的能量迅速热化，我们模拟了QGP流体随后的流体动力学演化。对于以超音速运动的部分子，(v_p>c_s)，并且能量损失足够大时，会形成一个冲击波，导致锥形流。PHENIX合作组最近提出，在方位角分布中观察到的结构可能是由锥形流引起的。我们在此表明，对于部分子能量损失的唯象学上可接受的值，锥形流效应太弱，无法解释这些结构。
