Coherence effects between the initial and final state radiation in a dense QCD medium

Abstract

In these proceedings contribution we review our recent results of medium modifications to the coherence pattern between the initial and final state radiation. We study single gluon production off a highly energetic parton that undergoes a hard scattering and subsequently crosses a dense QCD medium of finite size. Multiple scatterings lead to a partial suppression of the interferences between different emitters that opens the phase space for large angle emissions. We briefly discuss the generalization of this setup to describe gluon production in the case of pA collisions by including finite length and energy corrections. The configuration studied here may have phenomenological consequences in high-energy nuclear collisions.

Dynamics of particle production in Pb--Pb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV using PYTHIA8 Angantyr model

“…Hardening of the p T spectra can be seen towards most central and is more pronounced for heavier particles. A centrality cut-off at (30)(31)(32)(33)(34)(35)(36)(37)(38)(39)(40)% is observed and found to coincide with MB, which implies centralities above this cut-off produce harder particles. • The p T integrated yield normalized by total events of identified charged particles and strange particles show a clear mass ordering.…”

“…In general, an event generator at high colliding energies produces around four to ten partonic interactions, which depend on the overlapping region of colliding particles [32]. The perturbative scattering processes are implemented by Initial State Radiation (ISR) and Final State Radiation (FSR) [33,34].…”