Numerical solution of Q 2 evolution equations in a brute-force method
Description
Abstract We investigate the numerical solution of Q^2evolution equations for structure functions in the nucleon and in nuclei. (Dokshitzer-Gribov-Lipatov-)Altarelli-Parisi and Mueller-Qiu evolution equations are solved in a brute-force method. Spin-independent flavor-nonsinglet and singlet equations with next-to-leading-order α_scorrections are studied. Dividing the variables x and Q^2into small steps, we simply solve the integrodifferential equations. Numerical results indicate that accuracy is... Title of program: BF1 Catalogue Id: ADDB_v1_0 Nature of problem This program solves Altarelli-Parisi Equations or modified evolution equations (Mueller-Qiu) with or without next-to-leading-order alphas effects for a spin-independent structure function or quark distribution. Both flavor-nonsinglet and singlet cases are provided, so that the distributions, xq , xq , xq+ = xq + xqbar (i=quark flavor), xg, xF , NS S i - i i NS xF , and xF+ in the nucleon and in nuclei can be evolved. S i Versions of this program held in the CPC repository in Mendeley Data ADDB_v1_0; BF1; 10.1016/0010-4655(96)00013-6 This program has been imported from the CPC Program Library held at Queen's University Belfast (1969-2019)