Determination of polarized parton distribution functions
M. Hirai, H. Kobayashi, M. Miyama
Abstract
We study parametrization of polarized parton distribution functions in the αs leading order (LO) and in the next-to-leading order (NLO). From χ2 fitting to the experimental data on A1, optimum polarized distribution functions are determined. The quark spin content ΔΣis very sensitive to the small-x behavior of antiquark distributions which suggests that small-x data are needed for precise determination of ΔΣ. We propose three sets of distributions and also provide FORTRAN library for our distributions.
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