Photon-hadron jet correlations in p+p and Au+Au collisions at s(NN)=200 GeV

0345165 - FZÚ 2011 RIV US eng J - Journal Article
Adare, A. - Afanasiev, S. - Aidala, C. - Růžička, Pavel - Tomášek, Lukáš - Vrba, Václav
Photon-hadron jet correlations in p+p and Au+Au collisions at s(NN)=200 GeV.
Physical Review. C. Roč. 80, č. 2 (2009), 024908/1-024908/4. ISSN 0556-2813
R&D Projects: GA MŠMT LA08015
Institutional research plan: CEZ:AV0Z10100502
Keywords : PHENIX * photon * jet correlations
Subject RIV: BF - Elementary Particles and High Energy Physics
Impact factor: 3.477, year: 2009
http://arxiv.org/pdf/0903.3399

We report the observation at the Relativistic Heavy Ion Collider (RHIC) of suppression of back-to-back correlations in the direct photon+jet channel in Au+Au relative to p+p collisions. Two-particle correlations of direct photon triggers with associated hadrons are obtained by statistical subtraction of the decay photon-hadron background. The initial momentum of the away-side parton is tightly constrained, because the parton-photon pair exactly balance in momentum at leading order in perturbative quantum chromodynamics (pQCD), making such correlations a powerful probe of the in-medium parton energy loss.
Permanent Link: http://hdl.handle.net/11104/0186494