Speaker
Description
Jet substructure observables are an effective probe of QCD in many environments. In the vacuum of pp collisions, they simultaneously probe the weakly coupled properties of parton showers and the strongly coupled phenomena of hadronisation. In the presence of the deconfined QCD medium, jet substructure observables provide a multi-scale tool to test the scale-dependent evolution of the QGP medium's degrees of freedom. The excellent tracking capabilities of the ALICE detector enable jet substructure measurements down to low $p_{\textrm{T}}^{\textrm{ch jet}}$, probing the interface of pQCD and npQCD regimes, and with excellent precision in the challenging high occupancy in Pb--Pb collisions. We present a set of new jet substructure measurements in pp and heavy-ion collisions with ALICE, including energy correlators, jet angularities, and substructure of charm-tagged jets. Together, these measurements further our understanding of QCD and the properties of the QGP medium.