Studies of jet quenching in O+O collisions at √ s NN = 200 GeV by STAR

Jet quenching is a well-established probe of the QGP in large collision systems such as Au+Au and Pb+Pb, but is not observed in smaller p+A collisions despite the presence of collectivity. This makes it important to study its dependence on system size. O+O collisions offer an ideal opportunity, bridging the gap between small and large systems. In these proceedings, we present the measurements of the following observables related to jet quenching: inclusive charged hadron R AA and R CP at high transverse momentum ( p T ), inclusive jet R CP , and semi-inclusive hadron+jet I CP , using O+O collisions data collected with the STAR detector in 2021 at √ s NN = 200 GeV. For jet measurements, combinatorial background is subtracted based on the event mixing technique, while background fluctuations and detector effects are corrected via unfolding. Inclusive charged hadron and jet R CP and h+jet I CP are found to be below unity, indicating suppression relative to peripheral events.