paper

Model for Polarized and Unpolarized Parton Density Functions in the Nucleon

arXiv:hep-ph/9911286 · doi:10.1016/S0370-2693(00)00158-1

Abstract

We present a physical model for polarized and unpolarized structure functions and parton density functions (PDFs) of the proton and the neutron. It reproduces the data on F_2^p(x,Q^2) for 0.00001<x<1 and 2.5<Q^2<5000 GeV^2, F_2^p(x)-F_2^n(x), F_2^n(x)/F_2^p(x), xg(x), dbar(x)-ubar(x), d(x)/u(x), the Gottfried sum, the fractional momentum of charged partons and the polarized structure functions g_1^{p,n}(x), at various Q^2. We present for the first time, proton and neutron PDFs which do not assume charge symmetry. Contrary to the common practice, we explain polarized and unpolarized data with a single model.

version to appear in Phys. Lett. B; a note added at the end of the paper; no other change; latex, 10 pages, 4 ps figures

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