The space-time structure of the energy deposition into the bulk medium due to jet quenching

TL;DR

This paper investigates how jets deposit energy into the bulk medium during heavy-ion collisions, using fluid dynamics and in-medium shower evolution models to understand the medium's reaction and the role of fluctuations.

Contribution

It introduces a detailed analysis of the space-time structure of energy deposition from jets, incorporating recent constraints and fluctuations within the YaJEM-DE model.

Findings

Energy deposition patterns influence medium response

Fluctuations significantly affect energy flow dynamics

Constraints from RHIC and LHC data improve source term modeling

Abstract

While jet quenching in ultrarelativistic heavy-ion collisions is firmly established as a phenomenon resulting from the interplay between hard perturbative and soft fluid-dynamical Quantum Chromodynamics (or equivalently the interaction between hard probes and bulk QCD matter), less is known with certainty about the reaction of bulk matter to the passage of a jet. On general grounds, a jet interacting while passing through a medium represents a source of energy and momentum for the bulk matter fluid. If the precise form of such a source term is known, the reaction of the medium can be computed using fluid dynamics. Recent advances in the understanding of hard probes due to the wealth of data from RHIC and LHC allow to constrain the source term better by determining the energy flow away from hard modes. The aim of this work is to discuss what can be learned from such constraints in the context of the in-medium shower evolution code YaJEM-DE and to illustrate the role of fluctuations in the energy deposition.