# Numerical solution of Q 2 evolution equations for polarized structure functions

## Description

Abstract We investigate numerical solution of Dokshitzer-Gribov-Lipatov-Altarelli-Parisi (DGLAP) Q^2evolution equations for longitudinally polarized structure functions. Flavor nonsinglet and singlet equations with next-to-leading-order α_scorrections are studied. A brute-force method is employed. Dividing the variables x and Q^2into small steps, we simply solve the integrodifferential equations. Numerical results indicate that accuracy is better than 1% in the region 10^(-5)< x < 0.8 if more... Title of program: BFP1 Catalogue Id: ADHF_v1_0 Nature of problem This program solves DGLAP Q^2 evolution equations with or without next- to-leading-order alphas effects for longitudinally polarized parton distributions. The evolved distributions could be convoluted with coefficient functions for calculating the structure function g1. Both flavor-nonsinglet and singlet cases are provided, so that the distributions, xDeltaq_NS, xDeltaq_s, xDeltaq_i+ equivalent to xDeltaq_i^+ xDeltaqibar (i=quark flavor), xDeltag, xg1NS, xg1_S, and xg(1,_i)^+ can be obtained. Versions of this program held in the CPC repository in Mendeley Data ADHF_v1_0; BFP1; 10.1016/S0010-4655(97)00129-X This program has been imported from the CPC Program Library held at Queen's University Belfast (1969-2019)