Measurement of $R_{d+Au}$ at Low $x$ in $\sqrt{s}$=200 GeV d+Au and p+p collisions

Nuclear modification factor measurements in d+Au collisions ($R_{d+Au}$) at large rapidities and low x can be used to determine the suppression effects of nuclear shadowing and gluon saturation. These measurements lead to a better understanding of the initial conditions of heavy ion collisions and, in particular, can be used to investigate the possible existence of a Colored Glass Condensate (CGC). At transverse momenta greater than 2 GeV/$c$, photons from neutral pion decay cannot be independently resolved by the high rapidity 3 $<$ $\eta$ $<$ 4 Muon Piston Calorimeter (MPC) detector at PHENIX. Therefore, to obtain a measurement of neutral pion production at high $p_T$ and high rapidity it is necessary to examine decay products that appear in the detector as a single cluster. This talk will discuss the present status of the analysis for d+Au and p+p collisions at $\sqrt{s}$=200 GeV.