Determination of polarized parton distribution functions with recent data on polarization asymmetries
Abstract
Global analysis has been performed within the next-to-leading order in Quantum Chromodynamics (QCD) to determine polarized parton distributions with new experimental data in spin asymmetries. The new data set includes JLab, HERMES, and COMPASS measurements on spin asymmetry A1 for the neutron and deuteron in lepton scattering. Our new analysis also utilizes the double-spin asymmetry for pi0 production in polarized pp collisions, ALLpi0, measured by the PHENIX collaboration. Because of these new data, uncertainties of the polarized PDFs are reduced. In particular, the JLab, HERMES, and COMPASS measurements are valuable for determining Delta dv(x) at large x and Delta qbar(x) at x~0.1. The PHENIX pi0 data significantly reduce the uncertainty of Delta g(x). Furthermore, we discuss a possible constraint on Delta g(x) at large x by using the HERMES data on g1d in comparison with the COMPASS ones at x~0.05.
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