Measurement of Angular and Momentum Distributions of Charged Particles within and Around Jets in Pb+Pb and pp Collisions at √{sₙₙ} = 5.02 TeV with ATLAS at the LHC

Studies of the fragmentation of jets into charged particles in heavy-ion collisions can help in understanding the mechanism of jet quenching by the hot and dense QCD matter created in such collisions, the quark-gluon plasma. These proceedings present a measurement of the angular distribution of charged particles around the jet axis in √{sₙₙ} = 5.02 TeV Pb+Pb and pp collisions, done using the ATLAS detector at the LHC. The measurement is performed inside jets reconstructed with the anti-kₜ algorithm with radius parameter R = 0.4, and is extended to regions outside the jet cone. Results are presented as a function of Pb+Pb collision centrality, and both jet and charged-particle transverse momenta.

Jets (Nuclear physics), Nuclear fragmentation, Physics, Lead-lead interactions, Proton-proton interactions, Large Hadron Collider (France and Switzerland)
CC BY-NC-ND 4.0 (Attribution-NonCommercial-NoDerivatives), ©2019 CERN for the benefit of the ATLAS Collaboration