Study of J/ψ production with jet activity in p+p collisions at √s = 200 GeV with the STAR experiment

The production mechanism of quarkonia in p+p collisions involves both the perturbative and non-perturbative QCD processes and is a topic of active investigation. Quarkonium production from Color Singlet Model and Color Octet Mechanism is expected to result in different jet activities, i.e., the number of jets associated with quarkonium creation, due to different numbers of emitted hard partons. Therefore, the study of J/ψ production with respect to jet activity can help differentiate between the different quarkonium production mechanisms.

In this talk, we will present the first measurement of the J/ψ production cross section as a function of jet activity using the p+p collision data at √s = 200 GeV collected by the STAR experiment in 2015 at RHIC. These results are compared to PYTHIA calculations, and physics implications will be discussed.