Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2005-06-18
Acta Phys.Hung. A25 (2006) 389-399
Physics
Nuclear Physics
Nuclear Experiment
Proc. 21st. Winter Workshop on Nuclear Dynamics
Scientific paper
10.1556/APH.25.2006.2-4.29
Azimuthal correlation functions are used to study jet- and di-jet properties as a function of centrality in Au+Au collisions at $\sqrt{s_{_{\rm NN}}}$=200 GeV. Utilizing a novel technique to decompose the correlation function into a (di-)jet and an underlying event, the jet-pair distribution is extracted and compared to similar results for d+Au collisions obtained at the same collision energy. A striking similarity is observed between the widths and associated yields of the (di-)jet distributions for d+Au and peripheral Au+Au collisions. By contrast, the distributions for mid-central Au+Au collisions indicate an increase in the di-jet yield with centrality, and a very broad away-side jet having a possible minimum at $\Delta\phi \approx \pi$. These features point to significant medium induced modification to the away-side jet and are compatible with recent predictions of jet-induced "conical flow".
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