Hydrodynamic flow from fast particles

Abstract

We study the hydrodynamical response of the quark gluon plasma to the passage of high momentum particle within the context of linearized hydrodynamics in a static fluid. Two modes can be excited, the sound and the diffuson. Assuming that significant part of the energy lost by the particle thermalizes we discuss the modification of the azimuthal dihadron distributions due to the jet induced flow (conical flow). If the energy loss is large and no significant entropy is produced, large angle correlations are produced at Δφ = π - 1.2rad. We also estimate the effect of the expanding fireball on the sound wave amplitude, which grows as a consequence of the dilution of the background medium. Finally, if the speed of sound goes to zero at the mixed phase (first order phase transition) reflected waves appear that lead to correlation at Δφ = 1.4rad. © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-Non Commercial-ShareAlike Licence.