Measurement of γ+jet and π⁰+jet in central Au+Au collisions at √s_NN = 200 GeV with the STAR experiment

2020/08/20 by Sahoo, Nihar Ranjan
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph) #Nuclear Experiment (nucl-ex) #Nuclear Theory (nucl-th)

paper · doi:10.48550/arxiv.2008.08789

Abstract

We present the semi-inclusive measurement of charged jets recoiling from direct-photon and π⁰ triggers in central Au+Au collisions at √s_\mathrm NN = 200 GeV, using a dataset with integrated luminosity 13 \mathrm nb^-1 recorded by the STAR experiment in 2014. The photon and π⁰ triggers are selected within transverse energy (\rm E_T^trig) between 9 GeV and 20 GeV. Charged jets are reconstructed with the anti-k_T algorithm with resolution parameters R = 0.2 and 0.5. A Mixed-Event technique developed previously by STAR is used to correct the recoil jet yield for uncorrelated background, enabling recoil jet measurements over a broad \rm p_T,jet range. We report fully corrected charged-jet yields recoiling from direct-photon and π⁰ triggers for the above two jet radii and also discuss the jet R dependence of in-medium parton energy loss at the top RHIC energy.

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