Shadowing effects on the nuclear suppression factor,RdAu, ind+Auinteractions

We explore how nuclear modifications to the nucleon parton distributions affect production of high-transverse-momentum hadrons in deuteron-nucleus collisions. We calculate the charged hadron spectra to leading order using standard fragmentation functions and shadowing parametrizations. We obtain the $d+\mathrm{Au}$ to $pp$ ratio both in minimum bias collisions and as a function of centrality. The minimum bias results agree reasonably well with the BRAHMS data while the calculated centrality dependence underestimates the data and is a stronger function of $p_T$ than the data indicate.