Abstract
The yield of charged hadrons at intermediate pT (2-5 GeV/c) on the away-side of a high pT hadron trigger is known to be suppressed in central relativistic heavy-ion collisions. The mechanism by which the jet opposite the trigger has its redistributed is not yet fully understood. Although rarer than dijets, direct photon-jet pairs may provide additional constraints on parton energy loss models. The benefits of direct photon triggers are two-fold. In contrast to dijet systems where the jet energy is known only after full jet reconstruction, the direct photon carries approximately the full energy of the jet. Also, the trigger photons do not suffer from the same geometrical bias that causes high pT hadrons from jets to be produced predominately near the surface of the collision region. This poster discusses the method by which the direct photon correlation signal can be separated from the decay photon correlation signal. We present the results of two particle correlation studies of charged hadrons associated with high pT photon triggers in p − p collisions. The results are compared to data from Au−Au collisions and expectations from the PYTHIA event generator.
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