Campus Units

Physics and Astronomy

Document Type

Article

Publication Version

Published Version

Publication Date

7-16-2013

Journal or Book Title

Physical Review Letters

Volume

111

Issue

3

First Page

032301

DOI

10.1103/PhysRevLett.111.032301

Abstract

The jet fragmentation function is measured with direct photon-hadron correlations in p + p and Au + Au collisions at root S-NN = 200 GeV. The P-T of the photon is an excellent approximation to the initial P-T of the jet and the ratio Z(T) = P-T(h)/P-T(gamma) 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. I-AA, 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 Z(T). The associated hadron yield at low Z(T) is enhanced at large angles. Such a trend is expected from redistribution of the lost energy into increased production of low-momentum particles.

Comments

This is an article from Physical Review Letters 111 (2013): 032301-1, doi:10.1103/PhysRevLett.111.032301. Posted with permission.

Copyright Owner

American Physical Society

Language

en

File Format

application/pdf

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