Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2010-08-24
Nucl.Phys.A854:168-174,2011
Physics
Nuclear Physics
Nuclear Experiment
proceeding for the RBRC workshop: "Saturation, the Color Glass Condensate and Glasma: What Have we Learned from RHIC?"
Scientific paper
10.1016/j.nuclphysa.2011.01.016
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 $2\rightarrow 2$ 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.
Braidot Ermes
for the STAR Collaboration
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