Speaker
Description
Isolated Photon-Hadron Correlations in pp and p--Pb Collisions at $\sqrt s_{\rm NN}$ = 5 TeV in ALICE.
Fernando Torales Acosta on behalf of ALICE collaboration.
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. We use a combination of isolation and electromagnetic shower-shape information obtained from the ALICE electromagnetic calorimeter and ALICE Inner Tracking System to reduce the large background from meson decays and fragmentation photons. We present isolated photon-hadron correlations and yields of charged hadrons in the unexplored kinematic range given by 10-40 GeV/$c$ $p_{\rm T}$ photons and 0.5-15 GeV/$c$ $p_{\rm T}$ charged tracks in $\sqrt{s_{\rm NN}} = $ 5.02 TeV pp and p--Pb collisions. We report the first measurement of photon-tagged fragmentation in p--Pb at the LHC. We show the ratio of fragmentation measurements in pp and p--Pb is consistent with unity, constraining cold nuclear matter effects on parton fragmentation.
