Jet structure in integrated EPOS3-HQ approach

Abstract

We report on the first results for jet observables from a time-like parton cascade integrated with hydrodynamic evolution within the EPOS3-HQ framework. The hard (jet) partons are produced along with soft partons in the initial state EPOS approach. The soft partons, represented by strings, melt into a thermalized medium which is described by a 3 dimensional event-by-event viscous hydrodynamic approach. The jet partons then propagate in the hydrodynamically expanding medium. The total jet energy gets progressively "degraded" when the partons reaching a thermal energy scale are melted into the hydrodynamic medium via the source terms. The full evolution proceeds in a parallel mode, without separating the thermalized and jet parts. We demonstrate how the transverse expansion of the medium affects the jet structure, and how the medium itself is affected by the jet recoil.

Jet overlap in heavy ion collisions at energies available at the CERN Large Hadron Collider and its consequences for the jet shape

“…However as one can see, the techniques for the background subtraction (including jet overlap subtrac-tion) are not standardised, new techniques such as machine learning are coming up and the goal is to provide a cleansed measurement which can be compared to a theoretical calculation of a solitary jet passing through the dense QGP medium. We have been presenting here, as well as previously [10] the calculations where jets are not solitary objects in PhPb collisions (especially in central events) at the LHC energies, and we expect more fullfledged jet event generators to appear in future. A goal of apple-to-apple comparison between theory and experiment will ultimately mandate to proceed with similar subtraction procedures on the theory side.…”

Jet-Fluid Interaction in the EPOS3-Jet Framework

“…This mimics the medium induced radiation at the stage of jet formation; (ii) collisional energy loss which is modelled via a Langevin-type longitudinal drag and random transverse kicks to each jet parton: ∆p = −A(t, x)∆t, ∆p ⊥ = n ⊥ √ qC ∆t. Different from the previously reported results [4], A(t, x) and qC are taken to be both temperature-and momentum-dependent according to [5], where they are evaluated with pQCD cross sections with running α s .…”