Two-particle correlations at forward rapidity in STAR

During the 2008 run RHIC provided high luminosity in both p + p and d + Au collisions at image. Electromagnetic calorimeter acceptance in STAR was enhanced by the new Forward Meson Spectrometer (FMS), and is now almost continuous over image and the full azimuth. This large acceptance provides sensitivity to the gluon density in the nucleus down to image, as expected for image parton scattering. Measurements of the azimuthal correlation between a forward image and an associated particle at large rapidity are sensitive to the low-x gluon density. Data exhibit the qualitative features expected from gluon saturation. A comparison to calculations using the Color Glass Condensate (CGC) model is presented.