Measurement of photon-jet correlations in p+p and central Au+Au collisions at √s_NN = 200 GeV by STAR

We report the semi-inclusive distribution of fully-reconstructed jets

recoiling from a direct photon trigger in pp and central Au+Au collisions

at √s_NN = 200 GeV. This observable provides an incisive probe of the

Quark-Gluon Plasma generated in high-energy nuclear collisions. Direct

photons are measured using the STAR Barrel Electromagnetic Calorime-

ter (BEMC). Jet reconstruction is carried out by the anti-kT algorithm

with jet resolution parameters R=0.2 and R=0.5, utilizing neutral energy

measured in the BEMC and charged-particle tracks measured in the Time

Projection Chamber (TPC). Uncorrelated jet background is mitigated us-

ing event mixing. This measurement extends a recently reported STAR

measurement of the same observable, which used charged-particle jets, to

fully-reconstructed recoil jets. The status of the analysis will be reported,

and its physics prospects will be discussed