Measurement of isolated-prompt photon$-$hadron correlations in Pb$-$Pb collisions at √sNN = 5.02 TeV

CERN-LHC. The ALICE Collaboration at the CERN LHC has measured the isolated-prompt photon$-$hadron correlations at midrapidity as a function of Δφ and zT = pTʰ/pTγ, in Pb$-$Pb collisions in different centrality intervals at centre-of-mass energy per nucleon pair of √sNN=5.02~TeV. The photon transverse momentum range is between 18$-$40 GeV/c. The Pb$-$Pb collision data are divided in the centrality classes 0$-$30%, 30$-$50% and 50$-$90%. The covered pseudorapidity range is |ηγ| <0.67. The isolation selection is based on a charged particle isolation momentum threshold pTiso,~ch = 1.5 GeV/c within a cone of radii $R=0.2$. The correlated hadrons have a pseudorapidity range of |ηʰ| <0.9 and a transverse momentum pTʰ>1.8~GeV/c. The correlated hadrons are integrated over |Δφ|>3/5π rad to extract the D(zT) distribution.