Two Particle Correlations at Forward Rapidity in STAR

Abstract

During the 2008 run RHIC provided high luminosity in both p+p and d+Au collisions at $\sqrt{s_{NN}}=200$ GeV. Electromagnetic calorimeter acceptance in STAR was enhanced by the new Forward Meson Spectrometer (FMS), and is now almost contiguous from $-1<\eta <4$ over the full azimuth. This large acceptance provides sensitivity to the gluon density in the nucleus down to $x\approx 10^{-3}$, as expected for $2\to 2$ parton scattering. Measurements of the azimuthal correlation between a forward ${\pi }^0$ 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.

proceeding for the RBRC workshop: "Saturation, the Color Glass Condensate and Glasma: What Have we Learned from RHIC?"

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