[u/mrichter/AliRoot.git] / PDF / spdf / ghruv.F

*
* $Id$
*
* $Log$
* Revision 1.1.1.3  2000/04/19 13:28:08  mclareni
* Import version 8.04
*
* Revision 1.2  2000/03/23 11:39:41  pdflib
* beta function changed to pdf_beta function
*
* Revision 1.1.1.1  1996/04/12 15:29:22  plothow
* Version 7.01
*
*
#include "pdf/pilot.h"
      FUNCTION GHRUV(Y,SQ)
C
C  STRUCTURE FUNCTION U-QUARK FROM A PROTON
      N=2
      A=0.421-0.0412*SQ
      ASQ=ABS(SQ)
      SI=1.
      IF (ASQ.GT.0.) SI=SQ/ABS(SQ)
      C=2-0.6223*SI*ASQ**0.8
      D=3.37+0.4319*SQ
      GHRUV=N*C*Y**A*(1.-Y**C)**D/PDF_BETA(D+1.0,A/C)
      RETURN
      END
Commit	Line	Data
21886bb6	1	*
	2	* $Id$
	3	*
	4	* $Log$
	5	* Revision 1.1.1.3 2000/04/19 13:28:08 mclareni
	6	* Import version 8.04
	7	*
	8	* Revision 1.2 2000/03/23 11:39:41 pdflib
	9	* beta function changed to pdf_beta function
	10	*
	11	* Revision 1.1.1.1 1996/04/12 15:29:22 plothow
	12	* Version 7.01
	13	*
	14	*
	15	#include "pdf/pilot.h"
	16	FUNCTION GHRUV(Y,SQ)
	17	C
	18	C STRUCTURE FUNCTION U-QUARK FROM A PROTON
	19	N=2
	20	A=0.421-0.0412*SQ
	21	ASQ=ABS(SQ)
	22	SI=1.
	23	IF (ASQ.GT.0.) SI=SQ/ABS(SQ)
	24	C=2-0.6223SIASQ**0.8
	25	D=3.37+0.4319*SQ
	26	GHRUV=NCY*A(1.-YC)D/PDF_BETA(D+1.0,A/C)
	27	RETURN
	28	END