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【Abstract】

Deciphering jet substructure modification patterns in heavy ion collisions holds the key to finding the inner working of the quark-gluon plasma. With the new runs at Relativistic Heavy Ion Collider (RHIC), I will discuss jet angularities for dijet production in proton-proton (pp) and nucleus-nucleus (AA) collisions at 200 GeV nucleon-nucleon center-of-mass collision energy. In particular, we provide NLL resummed predictions for angularity observables of groomed and ungroomed jets produced in pp collisions matched to next-to-leading order QCD calculations resulting in NLO+NLL′ accuracy. Our parton-level predictions are corrected for non-perturbative effects, such as hadronization and underlying event, using parton-to-hadron level transfer matrices obtained with the Sherpa event generator. We use the Q-Pythia and JEWEL event generators to estimate the impact of the interaction between the parton shower with the dense medium formed in heavy-ion collisions. In the end I will briefly discuss the theoretical progress of understanding a few new jet observables, including collinear-drop and flattened jet angularities.