Determination of polarized parton distribution functions and their uncertainties

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dc.creatorHirai, M.
dc.creatorKumano, S.
dc.creatorSaito, N.
dc.date2003-12-09
dc.date2003-12-18
dc.date.accessioned2026-07-07T10:48:56Z
dc.date.available2026-07-07T10:48:56Z
dc.descriptionWe investigate the polarized parton distribution functions (PDFs) and their uncertainties by using the world data on the spin asymmetry A_1. The uncertainties of the polarized PDFs are estimated by the Hessian method. The up and down valence-quark distributions are determined well. However, the antiquark distributions have large uncertainties at this stage, and it is particularly difficult to fix the gluon distribution. The χ^2 analysis produces a positively polarized gluon distribution, but even Δg(x)=0 could be allowed according to our uncertainty estimation. In comparison with the previous AAC (Asymmetry Analysis Collaboration) parameterization in 2000, accurate SLAC-E155 proton data are added to the analysis. We find that the E155 data improve the determination of the polarized PDFs, especially the polarized antiquark distributions. In addition, the gluon-distribution uncertainties are reduced due to the correlation with the antiquark distributions. We also show the global analysis results with the condition Δg(x)=0 at the initial scale, Q^2=1 GeV^2, for clarifying the error correlation effects with the gluon distribution.
dc.description9 pages, 15 eps figures, REVTeX, FORTRAN package is available at the web site http://www-hs.phys.saga-u.ac.jp/aac.html. Replaced 3 eps figures in Fig.2
dc.identifierhttps://arxiv.org/abs/hep-ph/0312112
dc.identifierhttp://arxiv.org/abs/hep-ph/0312112
dc.identifierPhys.Rev.D69:054021,2004
dc.identifierdoi:10.1103/PhysRevD.69.054021
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/184055
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectHigh Energy Physics - Experiment
dc.subjectNuclear Experiment
dc.subjectNuclear Theory
dc.titleDetermination of polarized parton distribution functions and their uncertainties
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