Heavy Ion Tea

Three-Particle Azimuthal Correlations from STAR
Jason Glyndwr Ulery (Purdue University)

Abstract: Modification to the away-side shape in central Au+Au collisions relative to {\it pp} and d+Au collisions has been observed in azimuthal 2-particle correlations. This modification can be explained by several different physics scenarios including: large angle gluon radiations, jet deflected by transverse flow, path length dependent energy loss, QCD-\v{C}ereknov gluon radiation of fast moving particles, and conical flow generated by hydrodynamic Mach-cone shock-waves. Three-particle azimuthal correlations have been studied because they can disentangle the physics scenarios with conical emission, QCD-\v{C}erenkov gluon radiation and Mach-cone shock-waves, from the other scenarios. We present results from STAR for 3-particle correlations with a trigger particle of $3