The substructure of high energy jets produced at colliders provides a variety of opportunities to study quantum chromodynamics, from stringent tests of perturbative QCD calculations to the nonperturbative physics of hadronization. Jet substructure has also emerged as a tool to study the deconfined, strongly-coupled quark-gluon plasma (QGP) produced in heavy-ion collisions. While the QGP is too small and short-lived to be probed with traditional scattering beams, jets can be used as probes since their fragmentation pattern is modified as they traverse the QGP. In this talk, I will present recent jet substructure measurements with ALICE. I will discuss measurements in proton-proton collisions, which investigate the boundary between perturbative and nonperturbative QCD, and measurements in heavy-ion collisions, which provide new opportunities to reveal the nature of the quark-gluon plasma. These will include measurements of jet angularities, the groomed jet radius, and subjet fragmentation functions.
ALICE Collaboration, arXiv:2107.11303
ALICE Collaboration, arXiv:2107.12984
Michelangelo Mangano, Monica Pepe-Altarelli and Pedro Silva.