### Session K16: Sub-Nucleonic Degrees of Freedom I

1:15 PM–3:03 PM, Sunday, April 15, 2007
Hyatt Regency Jacksonville Riverfront Room: City Terrace 12

Chair: Thomas Ulrlich, Brookhaven National Laboratory

Abstract ID: BAPS.2007.APR.K16.7

### Abstract: K16.00007 : Direct photon-hadron correlations in $\sqrt{s} = 200$ GeV p+p collisions with the PHENIX detector

2:27 PM–2:39 PM

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#### Author:

Matthew Nguyen
(Stony Brook University)

The modification of the away-side jet in hadron-hadron correlations indicates that the matter produced in heavy-ion collisions (A+A) is extraordinarily dense. Direct photon-hadron correlations provide a more sensitive probe than hadron-hadron correlations because the photon tracks the energy of the opposing jet more closely and has much less interaction with the medium than hadrons. A method has been developed to separate the direct photon-hadron correlations from the large background of decay photon-hadron correlations. Results will be presented from $\sqrt{s} = 200$ GeV p+p collisions from the run 5 PHENIX data. This data is an important baseline for the A+A data as well as an important check of the method in an environment free from the large background produced in A+A collisions. The results will be compared to predictions from the PYTHIA generator. The status of the A+A data will also be discussed.

To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2007.APR.K16.7