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Global analysis has been performed within the next-to-leading order inQuantum Chromodynamics (QCD) to determine polarized parton distributions withnew experimental data in spin asymmetries. The new data set includes JLab,HERMES, and COMPASS measurements on spin asymmetry A_1 for the neutron anddeuteron in lepton scattering. Our new analysis also utilizes the double-spinasymmetry for pi^0 production in polarized pp collisions, A_{LL}^{pi^0},measured by the PHENIX collaboration. Because of these new data, uncertaintiesof the polarized PDFs are reduced. In particular, the JLab, HERMES, and COMPASSmeasurements are valuable for determining Delta d_v(x) at large x and Deltaqbar(x) at x~0.1. The PHENIX pi^0 data significantly reduce the uncertainty ofDelta g(x). Furthermore, we discuss a possible constraint on Delta g(x) atlarge x by using the HERMES data on g_1^d in comparison with the COMPASS onesat x~0.05.Comment: 11 pages, REVTeX, 13 eps files, Phys. Rev. D in pres

Determination of polarized parton distribution functions with recent data on polarization asymmetries