Nuclear Physics Seminar
"Studying jet modification through direct-photon hadron correlations at √s = 200 GeV with PHENIX"
Presented by Ali Hanks, Stony Brook
Tuesday, March 26, 2013, 11 am
Small Seminar Room, Bldg. 510
Hosted by: Anne Sickles
Direct photon tagged jets, in the form of photon-hadron correlations, are well suited to provide unique insight into how jets interact with the quark gluon plasma. Since photons remain largely unmodified by the strongly coupled medium produced at RHIC, the measured photon momentum approximately balances that of the away-side parton. Therefore, the effective modification to the fragmentation function can be measured by comparing integrated away-side yields in direct photon-hadron correlations in Au+Au collisions to those in p+p. By varying the away-side integration range, the angular dependence of modification to the effective fragmentation function can also be studied. Direct photon-hadron correlations have been measured with PHENIX in p+p and Au+Au using a statistical subtraction technique to remove the decay photon contribution from the inclusive photon-hadron correlations, with an additional isolation cut applied in p+p to reduce uncertainties. These recently published results will be discussed in light of complementary results from STAR and the LHC, as well as qualitative comparisons with theoretical predictions.