# Quark Matter 2015 - XXV International Conference on Ultrarelativistic Nucleus-Nucleus Collisions

September 27, 2015 to October 3, 2015
Kobe, Fashion Mart, Japan
Japan timezone

## A Comprehensive Analysis of Jet Quenching via a Hybrid Strong/Weak Coupling Model for Jet-Medium Interactions

Sep 29, 2015, 10:50 AM
20m
KFM Hall "IO"

### KFM Hall "IO"

Contributed talk Jets and High pT Hadrons

### Speaker

Mr Daniel Pablos (Universitat de Barcelona)

### Description

Within a hybrid strong/weak coupling model for jets in strongly coupled plasma, we explore jet modifications in ultra-relativistic heavy ion collisions. Our approach merges the perturbative dynamics of hard jet evolution with the strongly coupled dynamics which dominates the soft exchanges between the fast partons in the jet shower and the strongly coupled plasma itself. We implement this approach in a Monte Carlo, which supplements the DGLAP shower with the energy loss dynamics as dictated by holographic computations, up to a single free parameter that we fit to data. We confront our model with available single jet, dijet and photon-jet data in Pb-Pb collisons at $\sqrt{s}=2.76$~ATeV and we obtain a satisfactory description after fitting one single parameter. We use our model to predict a broad range of dijet, photon-jet and Z-jet observables for the upcoming LHC Run II, at $\sqrt{s}=5.02$~ATeV. We then augment the model by incorporating the transverse momentum picked up by each parton in the shower as it propagates through the medium, at the expense of adding a second free parameter. We use this model to discuss the influence of the transverse broadening of the partons in a jet on intra-jet observables. In addition, we explore the sensitivity of such observables to the back-reaction of the plasma to the passage of the jet. Finally, we comment on the sensitivity of the different observables we have analyzed to the microscopic dynamics of the jet-plasma interaction.

### Primary authors

Mr Daniel Pablos (Universitat de Barcelona) Mrs Doga Gülhan (MIT) Dr Guilherme Milhano (CERN) Dr Jorge Casalderrey-Solana (Universitat de Barcelona) Prof. Krishna Rajagopal (MIT)