Indications of Conical Emission of Charged Hadrons at the BNL Relativistic Heavy Ion Collider
Three-particle azimuthal correlation measurements with a high transverse momentum trigger particle are reported for pp, d + Au, and Au + Au collisions at root(NN)-N-S = 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 theta = 1.37 +/- 0.02(stat)(-0.07)(+0.06)(syst), independent of p perpendicular to.
Grosnick, David; Koetke, Donald D.; Manweiler, Robert; Stanislaus, Shirvel; Webb, J. C.; and STAR Collaboration, "Indications of Conical Emission of Charged Hadrons at the BNL Relativistic Heavy Ion Collider" (2009). Physics and Astronomy Faculty Publications. 96.