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{\large Semi-inclusive hadron+jet measurement in Ru+Ru and Zr+Zr collisions at $\sqrt{s_\mathrm{NN}}$ = 200 GeV in STAR}

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{Yang He, for the STAR Collaboration
\\Shandong University}

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Jet quenching, modification of the jet properties arising from the jet-medium interaction in the Quark-Gluon Plasma (QGP), has been observed in high energy heavy-ion collisions, such as Au+Au and Pb+Pb. Meanwhile, study of jet quenching signatures in small systems, e.g., proton-nucleus collisions, has generated great interest in the community as the collectivity phenomenon, resembling that seen in large systems, has been observed in these collisions, raising the question whether a QGP is formed in the small system collisions. Jet quenching measurement in relatively smaller collision systems (Zr+Zr and Ru+Ru) compared to Au+Au collisions at RHIC provides important insights to the system size and path length dependences of the parton energy loss. Utilizing the mixed-event technique to remove uncorrelated combinatorial background present in heavy-ion collisions, we will report the measurement of semi-inclusive charged-particle jets recoiling from a high transverse-momentum hadron trigger (h+jet) for jet radii of 0.2 and 0.5 using the anti-$k_\mathrm{T}$ jet reconstruction algorithm. The trigger hadrons are selected with transverse momenta between 7 and 25 GeV/c. Results of fully corrected per-trigger jet yield integrated over a recoil region and its relative suppression in central to peripheral collisions at mid-rapidity as a function of transverse momentum will be presented.

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