Probing jet hadrochemistry modification with measurements of π, K, and p in jets and the underlying event in pp and Pb–Pb collisions at √s_NN = 5.02 TeV

Yale University Wright Laboratory 272 Whitney Ave., New Haven, USA

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Published online: 17 April 2026

Abstract

Measurements of jet substructure observables in heavy-ion (HI) collisions provide powerful constraints on the microscopic mechanisms of interactions between energetic partons and the quark–gluon plasma (QGP). Although there has been remarkable progress in measuring inclusive jet substructure, a complete understanding of identified particle production inside jets (jet hadrochemistry) and its modification in HI collisions remains elusive. Jet quenching models predict that the jet hadrochemical composition is modified in the QGP, arising from both jet-medium interactions and altered particle production in the jet wake. Measurements of jet hadrochemistry can help discriminate between proposed jet-medium interaction mechanisms. Enabled by the excellent particle identification (PID) capabilities of ALICE, we present the first measurements of π, K, and p ratios within jets and the underlying event as a function of particle transverse momentum in pp and Pb-Pb collisions at √s_NN = 5.02 TeV. These measurements provide insight into soft particle production mechanisms and helps distinguish various jet quenching effects.