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Measurements of double helicity asymmetries for inclusive hadron productionin polarized proton-proton collisions are sensitive to spin-dependent partondistribution functions, in particular to the gluon distribution function. Thisstudy focuses on double helicity asymmetries in eta and charged pion productionat mid-rapidity, as well as on the eta cross section and fragmentationfunctions.

Recent PHENIX Results on pi+, pi-, and eta Production in polarized pp Collisions at RHIC at sqrt(s) = 200 GeV