Abstract
The large single-particle high-pT suppression (RAA) observed in heavy-ion collisions at RHIC energies suggests a considerable loss of energy by hard-scattered partons. Additional experimental information is sought to improve the understanding of medium-induced energy loss beyond that given by RAA. Angular di-jet correlations are an important experimental probe currently available to investigate the mechanisms giving rise to jet quenching in heavy-ion collisions. In a comparison between Au+Au and p + p, it is observed that the quantities representing jet widths and shapes for the two species become comparable at high transverse momentum (pT > 7 GeV/c). This apparent similarity is interpreted as being due to some combination of the following: (a) an inability of di-jet correlations to serve as a penetrating probe of the medium, or (b) minimal medium-induced modification of the observed high-pT jets due to large fluctuations in energy loss probabilities. Additional experimental probes are discussed which offer the possibility to discriminate between such explanations.
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