! Moments of the polarized parton distribution functions ! from the E155 NLO pQCD fit to the world data set on g1(x,Q^2 = 5 GeV^2). ! Beam energy: 48.35 GeV. ! Source: T.S. Toole, "A Precision Measurement of the ! Spin Structure Functions g1p and g1d", pg227, ! Ph.D. thesis, American University, (2000) unpublished. ! ! Parametrization of the polarized PDF's were of the form: ! Delta f(x,(Q_0)^2) = A_f * x^(alpha_f) * f(x,(Q_0)^2) ! where: ! f(x,(Q_0)^2) are unpolarized PDF's from Gluck, Reya, and Vogt, Eur. Phys. J. C5, 461 (1998). ! and f = u (up valence quarks), d (down valence quarks), Qbar (sea quarks), or g (gluons). ! Delta Qbar = 1/2 * (Delta ubar + Delta dbar) + 1/5 * Delta sbar. ! ! Delta f(Q^2 = 5 GeV^2) = int[ Delta f(x,Q^2 = 5 GeV^2) dx] from 0 to 1. ! See G. Mitchell, SLAC Report SLAC-R-540 (1999) and the above references for details. ! ! Value +-Stat +-Syst Delta u 0.71 0.02 0.04 Delta d -0.45 0.03 0.03 Delta Qbar -0.01 0.01 0.02 Delta G 1.62 0.78 1.13