Study of Isolated-Photon + Jet Correlations in PbPb and pp Collisions at $\sqrt{s_{NN}} = 5.02\:\mathrm{TeV}$

Measurements of correlations in isolated-photon and jet pairs in pp and PbPb collisions at $\sqrt{s_{NN}} = 5.02~\mathrm{TeV}$ are reported. Jets are reconstructed with an anti-$k_\mathrm{T}$ clustering algorithm with a distance parameter of 0.3. For events containing a leading isolated photon with transverse momentum $p_\mathrm{T}^\gamma > 40~\mathrm{GeV}/c$ and an associated jet with $p_\mathrm{T}^\mathrm{Jet} > 30~\mathrm{GeV}/c$, the photon + jet transverse momentum balance in PbPb collisions is studied as a function of collision centrality and $p_\mathrm{T}^\gamma$. The results are compared to pp reference data collected at the same collision energy. A significant decrease in the ratio $p_\mathrm{T}^\mathrm{Jet}/p_\mathrm{T}^\gamma$ relative to that in the pp reference is observed.