A New Parametrization of Polarized Parton Distribution Functions

Abstract

Requiring the positivity and counting rule, we propose a new parametrization of the polarized parton distribution which reproduce the data well. We found that the NLO analysis is absolutely necessary to extract the correct information on the polarized gluon distributions. The calculated results of $x\Delta d_v(x)$ and $\Delta d_v(x)/d_v(x)$ seem to be consistent with the SMC data at $Q^2=$10GeV${}^2$.

3 pages including 1 eps-figure, use sprocl.sty and epsf.sty, Latex. Talk given at the 13th International Symposium on High Energy Spin Physics, (Protvino, Russia, Sept. 8--12, 1998)