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Measurements of fragmentation functions for jets associated with an isolatedphoton are presented for the first time in pp and PbPb collisions. The analysisuses data collected with the CMS detector at the CERN LHC at a nucleon-nucleoncenter-of-mass energy of 5.02 TeV. Fragmentation functions are obtained forjets with p$_\mathrm{T}^\text{jet} >$ 30 GeV in events containing an isolatedphoton with p$_\mathrm{T}^\gamma>$ 60 GeV, using charged tracks with transversemomentum p$_\mathrm{T}^\text{trk} >$ 1 GeV in a cone around the jet axis. Theassociation with an isolated photon constrains the initial p$_\mathrm{T}$ andazimuthal angle of the parton whose shower produced the jet. For central PbPbcollisions, modifications of the jet fragmentation functions are observed whencompared to those measured in pp collisions, while no significant differencesare found in the 50% most peripheral collisions. Jets in central PbPb eventsshow an excess (depletion) of low (high) p$_\mathrm{T}$ particles, with atransition around 3 GeV. This measurement shows for the first time thein-medium shower modifications of partons (quark dominated) with well definedinitial kinematics. It constitutes a new well-controlled reference for testingtheoretical models of the parton passage through the QGP.

physical review letters

Observation of medium induced modifications of jet fragmentation in PbPb  collisions at $\sqrt{s_\mathrm{NN}} =$ 5.02 TeV using isolated-photon-tagged  jets