Distributions of charged hadrons associated with high transverse momentum particles in pp and Au + Au collisions at s(NN)**(1/2) = 200-GeV
Phys.Rev.Lett. 95 (2005) 152301, 2005.
The STAR collaboration

Abstract
Charged hadrons in 0.15 < pt < 4 GeV/c associated with particles of pt^trig > 4 GeV/c are reconstructed in pp and Au+Au collisions at sqrt(s_NN)=200 GeV. The associated multiplicity and pt magnitude sum are found to increase from pp to central Au+Au collisions. The associated pt distributions, while similar in shape on the near side, are significantly softened on the away side in central Au+Au relative to pp and not much harder than that of inclusive hadrons. The results, consistent with jet quenching, suggest that the away-side fragments approach equilibration with the medium traversed.

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