  Two particle correlations between identified meson and baryon trigger
particles with 2.5 < p_T < 4.0 GeV/c and lower p_T charged hadrons have been
measured at midrapidity by the PHENIX experiment at RHIC in p+p, d+Au and Au+Au
collisions at sqrt(s_NN) = 200 GeV. The probability of finding a hadron near in
azimuthal angle to the trigger particle is almost identical for leading mesons
and baryons for non-central Au+Au. The yield for both trigger baryons and
mesons is significantly higher in Au+Au than in p+p and d+Au, except for
trigger baryons in central collisions. The baryon excess is likely to arise
predominantly from hard scattering processes.

Nuclear Experiment