Jet-hadron correlations in sNN =200GeV p+p and central Au+Au collisions

Azimuthal angular correlations of charged hadrons with respect to the axis of a reconstructed (trigger) jet in Au+Au and p+p collisionsat sNN=200GeV in STAR are presented. The trigger jet population in Au+Au collisionsis biased toward jets that have not interacted with the medium, allowing easier matching of jet energies between Au+Au and p+p collisionswhile enhancing medium effects on the recoiljet. The associated hadron yield of the recoiljet is significantly suppressed at high transverse momentum (pTassoc) and enhanced at low pTassoc in 0%-20% central Au+Au collisionscompared to p+p collisions, which is indicative of medium-induced parton energy loss in ultrarelativistic heavy-ion collisions. © 2014 American Physical Society.