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The transverse energy ($E_\mathrm{T}^{\gamma}$) spectra of photons isolatedfrom other particles are measured using proton-proton (pp) and lead-lead (PbPb)collisions at the LHC at $\sqrt{s_\mathrm{NN}} =$ 5.02 TeV with integratedluminosities of 27.4 pb$^{-1}$and 404 $\mu$b$^{-1}$ for pp and PbPb data,respectively. The results are presented for photons with 25 $<$$E_\mathrm{T}^{\gamma}$ $<$ 200 GeV in the pseudorapidity range $|\eta|$ $<$1.44, and for different centrality intervals for PbPb collisions. Photonproduction in PbPb collisions is consistent with that in pp collisions scaledby the number of binary nucleon-nucleon collisions, demonstrating that photonsdo not interact with the quark-gluon plasma. Therefore, isolated photons canprovide information about the initial energy of the associated parton inphoton+jet measurements. The results are compared with predictions from thenext-to-leading-order JETPHOX generator for different parton distributionfunctions (PDFs) and nuclear PDFs (nPDFs). The comparisons can help toconstrain the nPDFs global fits.

The production of isolated photons in PbPb and pp collisions at $\sqrt{s_\mathrm{NN}} =$ 5.02 TeV