Abstract
Mid-rapidity azimuthal correlations probe di-jets originating mainly from gluon-gluon hard-scattering. Measurements of such correlations have revealed significant (gluon-)jet modification in central Au + Au collisions. Azimuthal correlations of hadrons at forward rapidity with a mid-rapidity high-p⊥ hadron, on the other hand, probe asymmetric partonic scatterings involving large- x quarks and small- x gluons. We present preliminary results from STAR on correlations of charged hadrons at forward rapidity in the forward TPCs (2.7 < |η| < 3.9, p⊥ < 2 GeV /c) with high-p⊥ charged hadrons at mid-rapidity from the main TPC (|η| < 1, p⊥ > 3 GeV /c) in pp , d + Au , and Au + Au collisions at [Formula: see text]. The implications of the results for small- x gluon distributions (Color Glass Condensate formation) and the energy loss of quark jets at forward rapidity in nuclear medium are discussed.
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