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Measurements of azimuthal angle and transverse momentum ($p_\mathrm{T}$)correlations of isolated photons and associated jets are reported for pp andPbPb collisions at $\sqrt{s_{_{\mathrm{NN}}}} =$ 5.02 TeV. The data wererecorded with the CMS detector at the CERN LHC. For events containing a leadingisolated photon with $p_\mathrm{T}^\gamma >$ 40 GeV$/c$ and an associated jetwith $p_\mathrm{T}^\text{jet} >$ 30 GeV$/c$, the photon+jet azimuthalcorrelation and $p_\mathrm{T}$ imbalance in PbPb collisions are studied asfunctions of collision centrality and $p_\mathrm{T}^\gamma$. The results arecompared to pp reference data collected at the same collision energy and topredictions from several theoretical models for parton energy loss. No evidenceof broadening of the photon+jet azimuthal correlations is observed, while theratio $p_\mathrm{T}^\text{jet}/p_\mathrm{T}^\gamma$ decreases significantly forPbPb data relative to the pp reference. All models considered agree withinuncertainties with the data. The number of associated jets per photon with$p_\mathrm{T}^\gamma >$ 80 GeV$/c$ is observed to be shifted towards lower$p_\mathrm{T}^\text{jet}$ values in central PbPb collisions compared to ppcollisions.

Study of jet quenching with isolated-photon+jet correlations in PbPb and pp collisions at $\sqrt{s_{_{\mathrm{NN}}}} =$ 5.02 TeV