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# Suppression of Forward Pion Correlations in d+Au Interactions at STAR

(13 May 2010)  Key: citeulike:11524259

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### Abstract

During the 2008 run RHIC provided high luminosity in both p+p and d+Au collisions at $\sqrts_NN=200GeV$. Electromagnetic calorimeter acceptance in STAR was enhanced by the new Forward Meson Spectrometer (FMS), and is now almost contiguous from $-1<η<4$ over the full azimuth. This large acceptance provides sensitivity to the gluon density in the nucleus down to $x≈ 10^-3$. 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.