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1.	Adare, A., et al. (author) Photon-hadron jet correlations in p plus p and Au plus Au collisions at s(NN)=200 GeV 2009 In: Physical Review C (Nuclear Physics). - 0556-2813. ; 80:2 Journal article (peer-reviewed)abstract We report the observation at the Relativistic Heavy Ion Collider 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 (gamma-h) 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, making such correlations a powerful probe of the in-medium parton energy loss. The away-side nuclear suppression factor, I-AA, in central Au+Au collisions, is 0.32 +/- 0.12(stat)+/- 0.09(syst) for hadrons of 3 < p(T)(h)< 5 in coincidence with photons of 5 < p(T)(gamma)< 15 GeV/c. The suppression is comparable to that observed for high-p(T) single hadrons and dihadrons. The direct photon associated yields in p+p collisions scale approximately with the momentum balance, z(T)equivalent to p(T)(h)/p(T)(gamma), as expected for a measurement of the away-side parton fragmentation function. We compare to Au+Au collisions for which the momentum balance dependence of the nuclear modification should be sensitive to the path-length dependence of parton energy loss.

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Type of publication: journal article (1)

Type of content: peer-reviewed (1)

Author/Editor: Silvermyr, D. (1); Gustafsson, Hans-Åke (1); Nystrand, Joakim (1); Oskarsson, Anders (1); Otterlund, Ingvar (1); Stenlund, Evert (1); show more...; Tydesjö, Henrik (1); Bauer, F. (1); Donadelli, M. (1); Ellinghaus, F. (1); Hill, J. C. (1); Jia, J. (1); Jinnouchi, O. (1); Kim, S. H. (1); Leite, M. A. L. (1); Lenzi, B. (1); Milov, A. (1); Nakamura, T. (1); Tojo, J. (1); Vrba, V. (1); Li, X. (1); Ruzicka, P. (1); Grau, N. (1); Liu, H. (1); Fusayasu, T (1); Isobe, T. (1); Lebedev, A. (1); Lim, H. (1); Thomas, T. L. (1); Tomasek, L. (1); Bathe, S. (1); Boyle, K (1); Park, J (1); Kim, D. H. (1); Sukhanov, A. (1); Aphecetche, L. (1); Averbeck, R. (1); Awes, T. C. (1); Baldisseri, A. (1); Baumann, C. (1); Berdnikov, Y. (1); Borel, H. (1); Buesching, H. (1); Charvet, J. L. (1); Chujo, T. (1); Constantin, P. (1); Delagrange, H. (1); Dubey, A. K. (1); Enokizono, A. (1); Espagnon, B. (1); show less...

University: Lund University (1)

Language: English (1)

Research subject (UKÄ/SCB): Natural sciences (1)

Year: 2009 (1)

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