Hadron production in the forward and backward rapidities in dAu collisions at RHIC

We have developed new techniques to detect hadrons with the PHENIX muon spectrometers. This allows us to study the centrality dependent nuclear modification factor $R_{CP}$ with high $p_T$ hadrons in both forward (d direction) and backward (Au direction) rapidities, $1<\mathrm{\mid }\eta \mathrm{\mid }<2$, in dAu collisions at $\sqrt{s_{NN}}=200GeV$. Preliminary results show a suppression (enhancement) of high $p_T$ hadron production in central $0-20$ dAu collisions relative to the peripheral one ($60-88$ in centrality) at forward (backward) rapidity.