| 21886bb6 |
1 | * |
| 2 | * $Id$ |
| 3 | * |
| 4 | * $Log$ |
| 5 | * Revision 1.1.1.2 1996/10/30 08:27:39 cernlib |
| 6 | * Version 7.04 |
| 7 | * |
| 8 | * Revision 1.1.1.1 1996/04/12 15:29:04 plothow |
| 9 | * Version 7.01 |
| 10 | * |
| 11 | * |
| 12 | #include "pdf/pilot.h" |
| 13 | SUBROUTINE BXF3 (X,QQ,XF3) |
| 14 | C....................................................................... |
| 15 | C. |
| 16 | C. F3 (GIVES VALENCE FOR U AND D) |
| 17 | C. |
| 18 | C....................................................................... |
| 19 | #include "pdf/impdp.inc" |
| 20 | #include "pdf/expdp.inc" |
| 21 | + BBETA |
| 22 | DATA XLAM /0.47D00/, Q02/5.D0/ |
| 23 | DATA ONED/1.D0/, FIVED2/5.2D0/ |
| 24 | C |
| 25 | S = LOG( LOG( MAX(FIVED2,QQ)/XLAM**2)/ LOG( Q02/XLAM**2)) |
| 26 | ETA1=0.56D00-0.92D00*S*4.00D00/25.00D00 |
| 27 | ETA2=2.71D00+5.08D00*S*4.00D00/25.00D00 |
| 28 | XF3=(X**ETA1)*((ONED-X)**ETA2)/BBETA(ETA1,ONED+ETA2) |
| 29 | XF3=3.0D00*XF3 |
| 30 | RETURN |
| 31 | END |
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