2006/03/31 by M. Hirai, S. Kumano, N. Saito
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex #hep-ph #nucl-ex #nucl-th
paper · pdf · doi:10.1103/physrevd.74.014015
published as Phys.Rev.D74:014015,2006 · 11 pages, REVTeX, 13 eps files, Phys. Rev. D in press
arxiv created 2006/06/28 · openalex publication_date 2006/07/20 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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 J-Lab, 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 \ensuremathπ0 production in polarized pp collisions, ALL^\ensuremathπ0, measured by the PHENIX Collaboration. Because of these new data, uncertainties of the polarized PDFs are reduced. In particular, the J-Lab, HERMES, and COMPASS measurements are valuable for determining \ensuremathΔdv(x) at large x and \ensuremathΔq(x) at x\ensuremath∼0.1. The PHENIX \ensuremathπ0 data significantly reduce the uncertainty of \ensuremathΔg(x). Furthermore, we discuss a possible constraint on \ensuremathΔg(x) at large x by using the HERMES data on g1d in comparison with the COMPASS ones at x\ensuremath∼0.05.