Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2011-07-05
Physics
High Energy Physics
High Energy Physics - Experiment
4 pages, 2 figures, contribution to DIS2011 proceedings
Scientific paper
These proceedings show the preliminary results of the dijet longitudinal double spin asymmetry $A_{LL}$ in polarized proton-proton collisions at $\sqrt{s} = 200$ GeV for the pseudorapidity range $|\eta| \le 0.8$. The integrated luminosity of 10.6 pb$^{-1}$ used in this analysis was collected during RHIC Run-9. This result is presented as a function of the dijet invariant mass in multiple pseudorapidity acceptances. The division into different pseudorapidity regions allows the kinematics of the hard interaction to be constrained and information about the shape of $\Delta g(x)$ to be extracted for the first time. Comparisons are made with expectations from various different theoretical scenarios of polarized parton distributions of the proton.
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