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File indexing completed on 2025-08-05 08:21:11

0001  
0002 C*********************************************************************
0003  
0004 C...PYGRVW
0005 C...Auxiliary for the GRV 94 parton distribution functions
0006 C...for d+u sea and gluon.
0007 C...Authors: M. Glueck, E. Reya and A. Vogt.
0008  
0009       FUNCTION PYGRVW (X, S, AL, BE, AK, BK, A, B, C, D, E, ES)
0010  
0011 C...Double precision declaration.
0012       IMPLICIT DOUBLE PRECISION (A - Z)
0013  
0014 C...Evaluation.
0015       LX = LOG (1D0/X)
0016       PYGRVW = (X**AK * (A + X * (B + X*C)) * LX**BK + S**AL
0017      &     * EXP (-E + SQRT (ES * S**BE * LX))) * (1D0- X)**D
0018  
0019       RETURN
0020       END