5 * Revision 1.1.1.3 2000/04/19 13:28:08 mclareni
8 * Revision 1.2 2000/03/23 11:39:41 pdflib
9 * beta function changed to pdf_beta function
11 * Revision 1.1.1.1 1996/04/12 15:29:22 plothow
15 #include "pdf/pilot.h"
18 C STRUCTURE FUNCTION U-QUARK FROM A PROTON
23 IF (ASQ.GT.0.) SI=SQ/ABS(SQ)
24 C=2-0.6223*SI*ASQ**0.8
26 GHRUV=N*C*Y**A*(1.-Y**C)**D/PDF_BETA(D+1.0,A/C)