Probing jet hadrochemistry in Pb--Pb collisions with ALICE

Abstract

Jet substructure measurements in heavy-ion collisions provide constraints on jet quenching and the medium response in the QGP. Though there has been remarkable progress in inclusive-charged-hadron jet substructure measurements, understanding the identified particle composition of jets and their modification in heavy-ion collisions has proven challenging. Jet quenching models predict that the jet hadrochemical composition may be modified in heavy-ion collisions due to jet-medium interactions, as well as the medium response. Measurements of identified particles in jets can help discriminate between various parton-QGP interactions. We present the first measurements of $\pi$, K, and p ratios within charged-particle-jets, as well as in the underlying event, as a function of particle transverse momentum in pp and Pb--Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV. These measurements leverage the excellent PID capabilities of ALICE over a wide transverse momentum range. These results aim to understand soft particle production mechanisms and distinguish modified jet fragmentation from bulk effects.

Proceedings of the 12th International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions ("Hard Probes 2024"), submitted to EPJ Web of Conferences. 6 pages, 4 figures