Full jet in quark-gluon plasma with hydrodynamic medium response

Abstract

We study the nuclear modifications of full jets and their structures in relativistic heavy-ion collisions including the effect of hydrodynamic medium response to jet quenching. To study the evolutions of the full jet shower and the traversed medium with energy and momentum exchanges between them, we formulate a coupled jet-fluid model consisting of a set of jet transport equations and relativistic hydrodynamics equations with source terms. In our model, the full jet shower interacts with the medium and gets modified via collisional and radiative processes during the propagation. Meanwhile, the energy and momentum are deposited from the jet shower to the medium and then evolve with the medium hydrodynamically. The full jet defined by a cone size in the final state includes the jet shower and the particles produced from jet-induced flow. We apply our model to calculate the full jet energy loss and the nuclear modifications of jet rate and shape in Pb+Pb collisions at $2.76{\rm A~TeV}$. It is found that the inclusion of jet-induced flow contribution leads to stronger jet-cone size dependence for jet energy loss and jet suppression. Jet-induced flow also has a significant contribution to jet shape function and dominates at large angles away from the jet axis.Comment: 13 pages, 6 figure

Medium response to jets in heavy ion collisions

“…An example of this approach is the model used in Ref. [16] (we refer it as Jet Shower Transport + Hydro model below). In this model, it is assumed that all partons scattered by the jet partons instantaneously rethermalize in the medium fluid.…”

“…Here we briefly introduce the full jet study by Jet Shower Transport + Hydro model [16] and show the typical features of medium response contribution in jet observables. Some calculations with other models show different results but mostly they are the consequences of the competition with the effects other than the medium response.…”

“…[68] for the details of the model for the jet shower evolution, and Ref. [16] for the choice of the parameters).…”

“…is commonly used [16,17,22,[29][30][31][51][52][53][54][55][56][57][58][59][60][61][62]. Here, T µν fluid (x) is the energy-momentum tensor for the medium fluid, and J ν (x) is the source term representing the space-time profile of the energy and momentum deposited by jets.…”

“…Medium response, the effect of the wake generated by the jet propagation in the medium, is another possible contribution to the medium modification of the jet structures and has recently been focused [13][14][15][16][17][18][19]. The energy and momentum deposited by the jets are supposed to excite the medium, and induce flows following the jets.…”