Numerical solution of Q2 evolution equations for polarized structure functions

被引：87

作者：

Hirai, M ^{[1
]}

Kumano, S ^{[1
]}

Miyama, M ^{[1
]}

机构：

[1] Saga Univ, Dept Phys, Saga 840, Japan

来源：

COMPUTER PHYSICS COMMUNICATIONS | 1998年 / 108卷 / 01期

关键词：

structure function; polarized parton distribution; Q(2) evolution; numerical solution;

D O I：

10.1016/S0010-4655(97)00129-X

中图分类号：

TP39 [计算机的应用];

学科分类号：

081203 ; 0835 ;

摘要：

We investigate numerical solution of Dokshitzer-Gribov-Lipatov-Altarelli-Paris (DGLAP) Q(2) evolution equations for longitudinally polarized structure functions. Flavor nonsinglet and singlet equations with next-to-leading-order alpha(s) corrections are studied. A brute-force method is employed. Dividing the variables x and Q(2) into 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 than two hundred Q(2) steps and more than one thousand x steps are taken. Our evolution results are compared with polarized experimental data of the spin asymmetry A(1) by the SLAC-E130, SLAC-E143, EMC, and SMC collaborations. The comparison indicates that we cannot assume A(1) is independent of Q(2). We provide a FORTRAN program for the Q(2) evolution and devolution of polarized nonsinglet-quark, singlet-quark, Delta q(i)+Delta (q) over bar(i), and gluon distributions (and corresponding structure functions). (C) 1998 Published by Elsevier Science B.V.

引用

页码：38 / 55

页数：18

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