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We present measurements of the double longitudinal spin asymmetries forinclusive pi0 and pi+(-) production in polarized p+p collisions at sqrt(s) =200 GeV at mid-rapidity with the STAR detector from the 2005 RHIC run. Thesemeasurements are used to access Delta G/G, the gluon polarization in theproton. The observed unpolarized inclusive cross sections show good agreementwith NLO pQCD calculations. The double longitudinal spin asymmetries arecompared to NLO pQCD calculations based on different assumptions for the gluonpolarization in the nucleon to provide constraints on Delta G/G. At the presentlevel of statistics the measured asymmetries disfavor a large positive gluonpolarization, but cannot yet distinguish between other scenarios.

Longitudinal Spin Measurements with Inclusive Hadrons in Polarized p+p Collisions at 200 GeV