Jet shapes for isolated photon-tagged jets in PbPb and pp collisions at $\sqrt{s_\mathrm{NN}}=5.02~\mathrm{TeV}$

The modification of jet shapes in PbPb collision, relative to those in pp collision, is studied for jets associated with an isolated photon, using data collected with the CMS detector at the CERN LHC at a nucleon-nucleon center-of-mass energy of $5.02~\mathrm{TeV}$. Jet shapes are constructed in annuli around the axes of jets of transverse momentum $p_\mathrm{T}^\mathrm{jet} > 30~{\rm Ge\hspace{-.08em}V\hspace{-0.16em}}/\hspace{-0.08em}c $ that are associated with an isolated photon of $p_\mathrm{T}^\gamma > 60~{\rm Ge\hspace{-.08em}V\hspace{-0.16em}}/\hspace{-0.08em}c $, using charged particles of $p_\mathrm{T}^\mathrm{trk} > 1~{\rm Ge\hspace{-.08em}V\hspace{-0.16em}}/\hspace{-0.08em}c $. The jet shape distributions are consistent between peripheral PbPb collisions and pp collisions, and they become more different for more central PbPb collisions. The modifications are indicative of a larger fraction of the jet momenta being carried at larger distances from the jet axes, following the interaction between the medium and the traversing partons.