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Jet substructure observables provide unique probes of the properties of the Quark-Gluon Plasma (QGP). In this talk we report new measurements of groomed jet substructure in central Pb--Pb collisions at sNN=5. 02 TeV. We present the first application of dynamical grooming in heavy-ion collisions to search for excess kₓ, ₆ emissions, which is a signature of large-angle scattering of jets off quasi-particles in the QGP. We present additional measurements employing both the soft drop and dynamical grooming algorithms in 0--10\% central Pb--Pb, 30--50\% semicentral Pb--Pb, and pp collisions at s₍₍=5. 02 TeV. Results from the various grooming methods and parameters are compared. Comparisons to model calculations are also presented. The techniques developed for this measurement are more broadly applicable to jet substructure, which we likewise discussed.
R. J. Ehlers (Fri,) studied this question.