Probing Quarkonium Production Mechanisms with Jet Substructure

Understand

We use fragmenting jet functions (FJFs) in the context of quarkonia to study the production channels predicted by NRQCD (3S_1^(1), 3S_1^(8), 1S_0^(8), 3P_J^(8)).

• We choose a set of FJFs that give the probability to find a quarkonium with a given momentum fraction inside a cone-algorithm jet with fixed cone size and energy.
• This observable gives several lever arms that allow one to distinguish different production channels.
• In particular, we show that at fixed momentum fraction the individual production mechanisms have distinct behaviors as a function of the the jet energy.