+++ /dev/null
-*
-* $Id$
-*
-* $Log$
-* Revision 1.1.1.2 1996/10/30 08:31:48 cernlib
-* Version 7.04
-*
-* Revision 1.1.1.1 1996/04/12 15:30:05 plothow
-* Version 7.01
-*
-*
-#include "pdf/pilot.h"
-C*********************************************************************
-
- SUBROUTINE STROWP2(X,SCALE,UPV,DNV,SEA,STR,CHM,GL)
-C :::::::::::::: OWENS SET 2 PION STRUCTURE FUNCTION :::::::::::::::
-#include "pdf/impdp.inc"
-#if defined(CERNLIB_DOUBLE)
- DOUBLE PRECISION DGAMMA
-#endif
-#include "pdf/expdp.inc"
- + COW(3,5,4),TS(6),XQ(9)
-
-C...Expansion coefficients for up and down valence quark distributions.
- DATA ((COW(IP,IS,1),IS=1,5),IP=1,3)/
- 1 4.0000D-01, 6.2800D-01, 0.0000D+00, 0.0000D+00, 0.0000D+00,
- 2 -5.9090D-02, 6.4360D-01, 0.0000D+00, 0.0000D+00, 0.0000D+00,
- 3 -6.5240D-03, 1.4510D-02, 0.0000D+00, 0.0000D+00, 0.0000D+00/
-C...Expansion coefficients for gluon distribution.
- DATA ((COW(IP,IS,2),IS=1,5),IP=1,3)/
- 1 7.9400D-01, 0.0000D+00, 2.8900D+00, 6.0000D+00, 0.0000D+00,
- 2 -9.1440D-01, -1.2370D+00, 5.9660D-01, -3.6710D+00, -8.1910D+00,
- 3 5.9660D-01, 6.5820D-01, -2.5500D-01, -2.3040D+00, 7.7580D+00/
-C...Expansion coefficients for (up+down+strange) quark sea distribution.
- DATA ((COW(IP,IS,3),IS=1,5),IP=1,3)/
- 1 9.0000D-01, 0.0000D+00, 5.0000D+00, 0.0000D+00, 0.0000D+00,
- 2 -1.4170D-01, -1.6970D-01, -2.4740D+00, -2.5340D+00, 5.6210D-01,
- 3 -1.7400D-01, -9.6230D-02, 1.5750D+00, 1.3780D+00, -2.7010D-01/
-C...Expansion coefficients for charm quark sea distribution.
- DATA ((COW(IP,IS,4),IS=1,5),IP=1,3)/
- 1 0.0000D+00, -8.8200D-02, 1.9240D+00, 0.0000D+00, 0.0000D+00,
- 2 6.2290D-02, -2.8920D-01, 2.4240D-01, -4.4630D+00, -8.3670D-01,
- 3 -4.0990D-02, -1.0820D-01, 2.0360D+00, 5.2090D+00, -4.8400D-02/
-
- DATA ZEROD/0.D0/, ONED/1.D0/, SIXD/6.D0/
- DATA ALAM/0.4D0/, Q02/4.D0/, QMAX2/2.D3/
-C...Pion structure functions from Owens.
-C...Allowed variable range: 4 GeV^2 < Q^2 < approx 2000 GeV^2.
-
-C...Determine set, Lambda and s expansion variable.
- Q2 = SCALE*SCALE
- Q2IN = MIN( QMAX2,MAX( Q02,Q2))
- SD = LOG( LOG( Q2IN/ALAM**2)/ LOG( Q02/ALAM**2))
-
-C...Calculate structure functions.
- DO 10 KFL=1,4
- DO 20 IS=1,5
- 20 TS(IS)=COW(1,IS,KFL)+COW(2,IS,KFL)*SD+
- & COW(3,IS,KFL)*SD*SD
- IF(KFL.EQ.1) THEN
-#if defined(CERNLIB_SINGLE)
- DENOM = GAMMA(TS(1))*GAMMA(TS(2)+ONED)/GAMMA(TS(1)+TS(2)+ONED)
-#endif
-#if defined(CERNLIB_DOUBLE)
- DENOM = DGAMMA(TS(1))*DGAMMA(TS(2)+ONED)/
- + DGAMMA(TS(1)+TS(2)+ONED)
-#endif
- XQ(KFL)=X**TS(1)*(1.-X)**TS(2)/DENOM
- ELSE
- XQ(KFL)=TS(1)*X**TS(2)*(1.-X)**TS(3)*(1.+TS(4)*X+TS(5)*X**2)
- ENDIF
- 10 CONTINUE
-
-C...output
- UPV = XQ(1)
- DNV = XQ(1)
- SEA = XQ(3)/SIXD
- STR = XQ(3)/SIXD
- CHM = XQ(4)
- GL = XQ(2)
-C
- RETURN
- END