Speaker
Description
Jet substructure is a powerful tool for performing fundamental QCD tests in elementary particle collisions and offers unique insight into the microscopic structure of the QGP in heavy-ion collisions. Defined as the energy-weighted cross section of particle pairs inside jets, the two-point energy-energy correlator (EEC) is a novel jet substructure observable probing the correlation of energy flow within jets. In pp collisions, the angular dependence of the EEC cross section shows a distinct separation of the perturbative and non-perturbative regimes, revealing the partonic dynamics of jet formation and the confinement of partons into hadrons. In heavy flavor jets, the EEC offers valuable insight into flavor dynamics of QCD parton fragmentation and hadronization, such as the different Casimir factors of quarks and gluons, as well as the mass of heavy quarks. Measurements of the EECs for inclusive jets in p-Pb and Pb-Pb probe the modifications to jet evolution caused by interactions with a cold nuclear medium and the quark-gluon plasma, respectively. In this talk, we present ongoing EEC measurements and the broad insights they offer into jet structure and jet-medium interactions.
