Medium modification of jet fragmentation in Au+Au collisions at √sNN=200 GeV measured in direct photon-hadron correlations

Adare, A. and Afanasiev, S. and Aidala, C. and Ajitanand, N. N. and Akiba, Y. and Akimoto, R. and Al-Bataineh, H. and Al-Ta'Ani, H. and Alexander, J. and Angerami, A. and Aoki, K. and Apadula, N. and Aphecetche, L. and Aramaki, Y. and Armendariz, R. and Aronson, S. H. and Asai, J. and Asano, H. and Aschenauer, E. C. and Atomssa, E. T. and Averbeck, R. and Awes, T. C. and Azmoun, B. and Babintsev, V. and Bai, M. and Baksay, G. and Baksay, L. and Baldisseri, A. and Bannier, B. and Barish, K. N. and Csanád, Máté and Csörgő, Tamás and Dávid, Gábor and Imrek, József and Kiss, Ádám and Nagy, Márton and Ster, András and Sziklai, János István and Tarján, Péter and Vértesi, Róbert and Zimányi, József (2013) Medium modification of jet fragmentation in Au+Au collisions at √sNN=200 GeV measured in direct photon-hadron correlations. PHYSICAL REVIEW LETTERS, 111 (3). ISSN 0031-9007

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Abstract

The jet fragmentation function is measured with direct photon-hadron correlations in p+p and Au+Au collisions at √sN N = 200 GeV. The pT of the photon is an excellent approximation to the initial pT of the jet and the ratio zT = ph T /pγ T is used as a proxy for the jet fragmentation function. A statistical subtraction is used to extract the direct photon-hadron yields in Au+Au collisions while a photon isolation cut is applied in p+p. IAA, the ratio of jet fragment yield in Au+Au to that in p+p, indicates modification of the jet fragmentation function. Suppression, most likely due to energy loss in the medium, is seen at high zT . The fragment yield at low zT is enhanced at large angles. Such a trend is expected from redistribution of the lost energy into increased production of low-momentum particles.

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