Recent Jet Measurements in ALICE

Abstract

The precise measurement of jets in pp collisions plays a critical role in the study of quantum chromodynamics (QCD). Measurements of jets in relativistic heavy-ion collisions are additionally useful for probing QCD matter in the regime of high densities and temperatures since the partons in the jet evolution interact strongly with the medium. This phenomenon is called jet quenching and is characterized by both jet energy loss and modification of the internal structure of the jet. The ALICE experiment is well suited for studies of jets and their corresponding internal structure due to the high precision tracking system. These proceedings report on an overview of recent ALICE jet results in both pp and Pb–Pb collisions. Results in pp collisions include measurements of generalized angularities of groomed and inclusive jets, a measurement of the Lund jet plane, and a measurement of jet axis differences. Results from Pb–Pb collisions include measurements of jet splittings, studies of subjet fragmentation, as well as a measurement of the jet nuclear modification factor made with machine learning techniques. These new results, when combined with the corresponding theoretical comparisons, provide information regarding the QCD processes of the parton shower and hadronization, as well as the underlying physics of jet quenching.