2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/226986We present a study of two-particle correlation functions involving photons and neutral pions in proton-proton and lead-lead collisions at the LHC energy. The aim is to use these correlation functions to quantify the effects of the medium on the jet decay properties.4 pages, 6 figures included, talk presented at the 42nd Rencontres de Moriond 2007 "QCD and High Energy Hadronic Interactions" session March, 18-24, La Thuile, Italy. To be appeared in the proceedings Rencontres de Moriond 2007High Energy Physics - Phenomenologytext