Abstract
During the 2008 run RHIC provided high luminosity in both p + p and d + Au collisions at s NN = 200 GeV . Electromagnetic calorimeter acceptance in STAR was enhanced by the new Forward Meson Spectrometer (FMS), and is now almost continuous over − 1 < η < 4 and the full azimuth. This large acceptance provides sensitivity to the gluon density in the nucleus down to x ≈ 10 − 3 , as expected for 2 → 2 parton scattering. Measurements of the azimuthal correlation between a forward π 0 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.
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