Probing inner-jet correlations in hot QCD: entropy, energy correlators, tracks and beyond

by Joao Lourenco Henriques Barata

Monday 2 Oct 2023, 16:00 → 17:30 Europe/Zurich

4/S-030 (CERN)

One of the biggest challenges in jet quenching is to find an optimal set of observables from which to extract medium induced modifications. The most traditional and widely used observables -- i.e. jet shapes such as the mass, girth, etc -- are designed to indirectly probe multiparticle modifications, but their connection to the underlying QFT is not settled. In recent years, observables such as energy-correlators or the jet entropy have pushed towards understanding jet substructure by directly probing their inner-correlations.

In this talk, I will present some recent and on-going work towards understanding the structure of jets in the QGP using these type of observables. I will begin by discussing the computation of the jet entropy in the heavy-ions context and how other entanglement measures can be used to further probe the jet structure. In a second part, I will examine the calculation of energy-correlators inside jets, their behavior in the presence of the QGP and how to mitigate for contamination from uncorrelated sources.

Finally, I will briefly argue that a better theoretical description requires an improved perturbative treatment of jets in the QGP and calls for a non-perturbative description of these observables, which is in principle possible in 1+1-d analogues of QCD.