2021/10/11 by James Declan Mulligan, Mulligan, James
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions
paper · pdf · doi:10.48550/arxiv.2110.05411
Jet substructure, defined by observables constructed from the distribution of constituents within a jet, provides the versatility to tailor observables to specific regions of QCD radiation phase space. This flexibility provides exciting new opportunities to study jet quenching in heavy-ion collisions and to ultimately help reveal the nature of the quark-gluon plasma. The ALICE detector is particularly well-suited to jet substructure measurements in heavy-ion collisions due to its high-precision tracking system. In these proceedings, we report several new jet substructure measurements in Pb-Pb collisions at √sNN=5.02 TeV with ALICE. These include the first fully corrected measurements of the groomed jet momentum splitting fraction, z_\rmg, and the groomed jet radius, θ_\rmg ≡ R_\rmg/R, as well as N-subjettiness and the fragmentation distribution of reclustered sub-jets. These measurements are compared to theoretical calculations and provide new constraints on the physics underlying jet quenching.