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

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

2010-05-13

arxiv.org/abs/1005.2378v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 6 figures, proceeding for the 45th Rencontres de Moriond (QCD)

Scientific paper

During the 2008 run RHIC provided high luminosity in both p+p and d+Au collisions at $\sqrt{s_{NN}}=200GeV$. 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 $x\approx 10^{-3}$. 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.

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