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FORTRAN program for a numerical solution of the nonsinglet Altarelli-Parisi equation

✍ Scribed by R. Kobayashi; M. Konuma; S. Kumano

Publisher
Elsevier Science
Year
1995
Tongue
English
Weight
760 KB
Volume
86
Category
Article
ISSN
0010-4655

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✦ Synopsis

We investigate a numerical solution of the flavor-nonsinglet Altarelli-Parisi equation with next-to-leading-order as corrections by using Laguerre polynomials. Expanding a structure function (or a quark distribution) and a splitting function by the Laguerre polynomials, we reduce an integrodifferential equation to a summation of finite number of Laguerre coefficients. We provide a FORTRAN program for Q2 evolution of nonsinglet structure functions (Fb F2, and F3) and nonsinglet quark distributions. This is a very effective program with typical running time of a few seconds on SUN-IPX or on VAX-4000/500. Accurate evolution results are obtained by taking approximately twenty Laguerre polynomials.

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