title: Effects of jet quenching on the hydrodynamical evolution of quark-gluon plasma.
abstract: 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.
authors.affiliation: Variable Energy Cyclotron Centre, 1-AF, Bidhan Nagar, Kolkata-700 064, India. akc@veccal.ernet.in
authors.forename: A K
authors.initials: AK
authors.lastname: Chaudhuri
authors.forename: Ulrich
authors.initials: U
authors.lastname: Heinz