4 *CMZ :- -26/04/91 11.11.56 by Bryan Webber
6 *-- Author : Bryan Webber
8 C-----------------------------------------------------------------------
12 C-----------------------------------------------------------------------
14 C CORRECTION TO GLUON STRUCTURE FUNCTION FOR BACKWARD EVOLUTION:
16 C G->Q-QBAR PART OF FORM FACTOR
18 C-----------------------------------------------------------------------
20 INCLUDE 'HERWIG61.INC'
22 DOUBLE PRECISION HWSGQQ,HWUALF,QSCA,GG
26 GG=HWUALF(1,QSCA)**(-ONE/BETAF)
30 IF (QSCA.GT.RMASS(6)) THEN
34 ELSEIF (QSCA.GT.RMASS(5)) THEN
38 ELSEIF (QSCA.GT.RMASS(4)) THEN