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Indications of conical emission of charged hadrons at the BNL relativistic heavy ion collider

By B.I. Abelev, Y. Bai, M.A.J. Botje, F. Benedosso, E Braidot, A. Mischke, T. Peitzmann, M.J. Russcher, R.J.M. Snellings and M. van Leeuwen


Three-particle azimuthal correlation measurements with a high transverse momentum trigger particle are reported for pp, d+Au, and Au+Au collisions at √sNN=200  GeV by the STAR experiment. Dijet structures are observed in pp, d+Au and peripheral Au+Au collisions. An additional structure is observed in central Au+Au data, signaling conical emission of correlated charged hadrons. The conical emission angle is found to be θ=1.37±0.02(stat)-0.07+0.06(syst), independent of p⊥

Year: 2009
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