Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2011-02-12
Nucl.Phys.A855:465-468,2011
Physics
High Energy Physics
High Energy Physics - Phenomenology
4 pages, 1 figure. Proceedings of the 4th International Conference on Hard and Electromagnetic Probes of High Energy Nuclear C
Scientific paper
10.1016/j.nuclphysa.2011.02.107
Medium-induced gluon radiation gives rise to the strong energy-loss observed in single-hadron spectra in heavy-ion collisions. Its angular structure, leading e.g. to intra-jet correlations, is only known for the one-gluon inclusive case. In the vacuum, properties such as angular ordering appear when considering less inclusive distributions due to destructive interference effects. We present a calculation which takes into account interference effects in a medium for a setup in which we consider gluon radiation off a quark-antiquark pair with a given opening angle. Surprisingly, computing the spectrum at leading-log accuracy we find that an ordering exists which is exactly opposite from that in the vacuum. We estimate the magnitude of the effect along with a discussion of the implications of such "anti-angular ordering" on jet physics in heavy-ion collisions.
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