Medium Modification of Jet Fragmentation in Au+Au Collisions at root sNN=200  GeV Measured in Direct Photon-Hadron Correlations

Adare, A. and Makek, Mihael and Zolin, L. (PHENIX Collaboration) (2013) Medium Modification of Jet Fragmentation in Au+Au Collisions at root sNN=200  GeV Measured in Direct Photon-Hadron Correlations. Physical Review Letters, 111 (3). pp. 32301-8. 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 root sNN=200  GeV. The pT of the photon is an excellent approximation to the initial pT of the jet and the ratio zT=phT/pγT 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 hadron yield opposite the photon 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 associated hadron 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.

Item Type: Article
Date: July 2013
Subjects: NATURAL SCIENCES > Physics
Additional Information: Copyright (2013) by the American Physical Society.
Divisions: Faculty of Science > Department of Physics
Publisher: American Physical Society
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 08 Jul 2014 09:27
Last Modified: 08 Jul 2014 09:27
URI: http://digre.pmf.unizg.hr/id/eprint/2192

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