Isolated Photon-Hadron Correlations in 5 TeV pp and p-Pb Collisions in ALICE at the LHC

The measurement of isolated photon-tagged correlations of jets and jet fragments is a promising channel for the study of partonic energy loss in heavy-ion collisions. Isolated photons are an excellent probe because they contain the parton kinematics from the initial hard scattering. This analysis studies isolated photon-hadron correlations using data collected at A Large Ion Collider Experiment (ALICE) in 2013 during √s_NN = 5 TeV p-Pb collisions and in 2017 during √s = 5 TeV pp collisions at the Large Hadron Collider (LHC). The per-trigger associated hadron yields for isolated photons with 12 < p_T < 15 GeV/c and associated charged particles with and 0.5 < pT < 10 GeV/c are measured. The yields measured in pp collisions and p-Pb collisions are consistent within uncertainties. This analysis is one of the first to use isolated photons in a measurement at ALICE, and establishes a benchmark for future measurements in Pb–Pb collisions.