Jet modification with medium recoil in quark-gluon plasma

TL;DR

This paper investigates how recoil particles generated by jet-medium interactions in quark-gluon plasma affect jet structure measurements, emphasizing the importance of including recoil effects for accurate jet modification analysis in heavy ion collisions.

Contribution

It demonstrates that including recoil particles in jet reconstruction improves the understanding of jet modifications in quark-gluon plasma, using the extsc{martini} simulation framework.

Findings

Recoil particles significantly influence jet mass and shape functions.

Including recoil particles improves agreement with experimental data.

Recoil energy is essential for accurate jet modification studies.

Abstract

Jet energy transported to quark-gluon plasma during jet-medium interaction excites the QGP medium and creates energetic thermal partons -- recoil particles or recoils. Modification of the jet structure in heavy ion collisions is studied using \textsc{martini}, in which recoil simulation is enabled. In large systems such as central Pb-Pb collisions, the recoil effect is expected to be critical due to strong jet-medium interaction. We show the results of the jet mass function and jet shape function are improved when the recoil particles are included in the reconstructed jets. We conclude that the energy carried by the recoil particles are regarded as a part of reconstructed jets and are necessary in studying jet modification in heavy ion collisions.