Probing properties of the QCD Medium using jet substructure techniques in pp and PbPb collisions at 5.02 TeV at CMS

We present results on measurements of inclusive jet substructure variables using grooming techniques with pp and PbPb data collected with the CMS detector at a center-of-mass energy of 5.02 TeV per nucleon pair. Jet grooming techniques are used to focus on the hard structure of the jet by extracting the two subjets corresponding to a hard parton splitting. The resulting groomed jets can be used to study modifications to the parton shower evolution in the presence of the hot and dense medium created in heavy ion collisions. The hard jet structure is sensitive to the virtuality evolution of a parton in the medium, as well as the role of (de)coherent gluon emitters. Modifications of shared momentum fraction and jet mass over a wide range of jet transverse momentum and various collision centrality selections are reported and compared to predictions from event generators and analytical calculations.