Jet shapes of isolated photon-tagged jets in PbPb and pp collisions at $\sqrt{s_\mathrm{NN}} =$ 5.02 TeV
Phys.Rev.Lett.
The CMS collaboration

Abstract
We report the first measurement of jet shapes for jets tagged with an isolated photon in pp and heavy-ion collisions. Jet shapes give crucial information on the evolution of parton shower in the plane transverse to parton's propagation. Photons constrain the associated parton's flavor and, not interacting with the QCD matter, provide precise information about the parton's momentum before traversing the medium. With this experimental control, available only with samples delivered by the LHC, jet shapes are observed to be strongly modified in the hot QCD medium, the results impose unprecedented constraints on theories for parton-medium interactions.

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