Isolated photon-hadron correlations in proton-proton collisions at √s = 7 TeV with the ALICE experiment

Arbor, N. and Abelev, B. and Adam, J. and Adamová, D. and Adare, A. M. and Aggarwal, M. M. and Aglieri, R. G. and Agócs, András and Agostinelli, A. and Aguilar, S. S. and Ahammed, Z. and Ahmad, A. and Ahmad, N. and Ahn, S. A. and Ahn, S. U. and Akindinov, A. and Aleksandrov, D. and Alessandro, B. and Alfaro, M. J. R. and Alici, A. and Alkin, A. and Alme, J. and Alt, T. and Altini, V. and Altinpinar, S. and Altsybeev, I. and Andrei, C. and Andronic, A. and Anguelov, V. and Anielski, J. and Barnaföldi, Gergely Gábor and Bencédi, Gyula and Berényi, Dániel and Boldizsár, László and Dénes, Ervin and Hamar, Gergő and Lévai, Péter and Pochybova, Sona (2013) Isolated photon-hadron correlations in proton-proton collisions at √s = 7 TeV with the ALICE experiment. NUCLEAR PHYSICS A, 904-90. ISSN 0375-9474

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Abstract

At high pT , direct photons produced in Compton and annihilation QCD leading order processes are associated to a jet in the opposite direction. Such processes are tagged experimentally by identifying leading isolated photons and their correlated associated hadrons in the opposite azimuthal direction. The jet fragmentation can be estimated from the hadrons and the photon via the imbalance parameter xE = −~p h T .~p γ T /|~p γ T | 2 . We present the results extracted from gammahadron correlations measured by the ALICE experiment in pp collisions at √ s = 7 TeV. Direct photons are first identified using isolated criteria. Then, the remaining contamination from neutral mesons decay photons is subtracted statistically to extract the xE distributions of isolated photon-hadron and isolated π 0 -hadron correlations.

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