Abstract
While the study of the quark-gluon plasma has been the primary focus of the RHIC experiments,
much work has also been done to understand so-called cold nuclear matter (CNM) e ects
through d+Au collisions where no hot plasma is produced. E ects such as nuclear shadowing,
Cronin enhancement, and initial-state parton energy loss, among others, are not only interesting
in their own right, but have direct implications on QGP-related measurements in A+A collisions.
Recently PHENIX has measured CNM e ects at midrapidity in √s_NN = 200 GeV d+Au collisions.
Measurements of reconstructed jets reveal the centrality dependence of both jet suppression
and broadening of the away-side jet. Meanwhile, single electrons from heavy flavor decays
exhibit enhancement, increasing with centrality, over a broad p_T range. J/psi and psi' modification
have also been measured and are quite di erent in magnitude, in contrast with our expectations.
The above results are presented here and compared to our present understanding of CNM effects.