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.
Highlights
Energetic partons, produced in high-energy hadron–hadron collisions, initiate a cascade of lower-energy quarks and gluons that eventually hadronize into collimated sprays of colorless hadrons called jets
Our approach summarises the consensus view arrived at in the CERN TH Institute ‘Novel tools and observables for jet physics in heavy-ion collisions’ [5], and uses the kinematic Lund plane to study how hadronic fragments are distributed in different quenching models
We have mainly focused on applying the so-called Soft Drop (SD) grooming procedure with β = 0 [30] and b 1 0 [31], to be detailed below, that aims at identifying the first hard jet branching
Summary
Energetic partons, produced in high-energy hadron–hadron collisions, initiate a cascade of lower-energy quarks and gluons that eventually hadronize into collimated sprays of colorless hadrons called jets. Our approach summarises the consensus view arrived at in the CERN TH Institute ‘Novel tools and observables for jet physics in heavy-ion collisions’ [5], and uses the kinematic Lund plane to study how hadronic fragments are distributed in different quenching models This representation provides a common language to discuss features of final state showering on an operational level that provides a basis for comparing qualitative and quantitative features of theoretical models and physical observables. These observables are not limited to substructure but are used in order to extract more differential aspects from inclusive jet observables.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
