Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2006-03-25
Phys.Rev.D74:014015,2006
Physics
High Energy Physics
High Energy Physics - Phenomenology
11 pages, REVTeX, 13 eps files, Phys. Rev. D in press
Scientific paper
10.1103/PhysRevD.74.014015
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 A_1 for the neutron and deuteron in lepton scattering. Our new analysis also utilizes the double-spin asymmetry for pi^0 production in polarized pp collisions, A_{LL}^{pi^0}, 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 d_v(x) at large x and Delta qbar(x) at x~0.1. The PHENIX pi^0 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 g_1^d in comparison with the COMPASS ones at x~0.05.
Hirai Makoto
Kumano S.
Saito Naohito
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