Novel tools and observables for jet physics in heavy-ion collisions

TL;DR

This paper reviews new jet substructure observables developed for heavy-ion collisions, aiming to better understand the medium-induced modifications of jet radiation patterns and extract properties of QCD matter.

Contribution

It introduces a strategy to identify physical processes behind jet modifications using innovative observables and advanced reconstruction techniques in heavy-ion collisions.

Findings

Development of new jet substructure observables

Integration of theory and experimental methods

Proposed strategy for isolating medium effects

Abstract

Studies of fully-reconstructed jets in heavy-ion collisions aim at extracting thermodynamical and transport properties of hot and dense QCD matter. Recently, a plethora of new jet substructure observables have been theoretically and experimentally developed that provide novel precise insights on the modifications of the parton radiation pattern induced by a QCD medium. This report, summarizing the main lines of discussion at the 5th Heavy Ion Jet Workshop and CERN TH institute "Novel tools and observables for jet physics in heavy-ion collisions" in 2017, presents a first attempt at outlining a strategy for isolating and identifying the relevant physical processes that are responsible for the observed medium-induced jet modifications. These studies combine theory insights, based on the Lund parton splitting map, with sophisticated jet reconstruction techniques, including grooming and background subtraction algorithms.