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A major emphasis of the RHIC spin program at BNL is to understand the gluon spin contribution, ∆G, to the spin of the proton. The PHENIX experiment at RHIC probes ∆G, utilizing its highly segmented calorimeter, by measuring the double longitudinal spin asymmetry , ALL, in the production of inclusive channels like π0 and η . π0 data from runs 2005 and 2006 were included in a recent NLO global analysis, DSSV, and set substantial new constraints on the polarized gluon distribution in the proton over the kinematic range 0.05 < x < 0.2. With improved luminosity and polarization, the figure of merit for the 2009 data set was a factor of 1.5 better that the previous runs combined. We present the 2009 results for π0 and η ALL, along with a discussion of the results from inclusion of these data in a recent update of the DSSV global analysis.

Double Longitudinal Spin Asymmetry Measurements of Inclusive pi0 and eta Production at PHENIX in 200 GeV Polarized p+p Collisions