Jet-induced medium excitation in γ -hadron correlation at RHIC

Medium response to jets in heavy ion collisions

“…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.…”

“…In this model, it is assumed that all partons scattered by the jet partons instantaneously rethermalize in the medium fluid. As another example, Coupled LBT Hydro model [17] is a full event-by-event model employing LBT Model for the jet evolution calculation. In this model, they assume that all the jet partons in LBT simulation with energy below a certain cutoff energy are completely absorbed in the medium fluid, and deposit their energy and momentum.…”

“…In Ref. [17], the γ-triggered jet fragmentation function and γ-hadron correlation as a function of ξ = − ln p h T /p γ T are calculated at RHIC energy by Coupled LBT Hydro model, and the significant enhancement of soft (large-ξ) hadrons due to the jet-induced medium excitation is shown. Also in a study with JEWEL [19], they show that the soft hadrons from the recoil partons modify the z g -distribution in 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.…”