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

*
* $Id$
*
* $Log$
* Revision 1.1.1.2  1996/10/30 08:28:28  cernlib
* Version 7.04
*
* Revision 1.1.1.1  1996/04/12 15:29:22  plothow
* Version 7.01
*
*
#include "pdf/pilot.h"
      FUNCTION GHRDV(Y,SQ)
C
C  D-QUARK FROM A PROTON STRUCTURE FUNCTION
      N=1
      A=0.364-0.0368*SQ
      ASQ=ABS(SQ)
      SI=1.
      IF (ASQ.GT.0.) SI=SQ/ABS(SQ)
      C=2-0.5414*SI*ASQ**0.8
      D=5.09+0.3463*SQ
      GHRDV=N*C*Y**A*(1.-Y**C)**D/BETA(D+1.0,A/C)
      RETURN
      END
Commit	Line	Data
fe4da5cc	1	*
	2	* $Id$
	3	*
	4	* $Log$
	5	* Revision 1.1.1.2 1996/10/30 08:28:28 cernlib
	6	* Version 7.04
	7	*
	8	* Revision 1.1.1.1 1996/04/12 15:29:22 plothow
	9	* Version 7.01
	10	*
	11	*
	12	#include "pdf/pilot.h"
	13	FUNCTION GHRDV(Y,SQ)
	14	C
	15	C D-QUARK FROM A PROTON STRUCTURE FUNCTION
	16	N=1
	17	A=0.364-0.0368*SQ
	18	ASQ=ABS(SQ)
	19	SI=1.
	20	IF (ASQ.GT.0.) SI=SQ/ABS(SQ)
	21	C=2-0.5414SIASQ**0.8
	22	D=5.09+0.3463*SQ
	23	GHRDV=NCY*A(1.-YC)D/BETA(D+1.0,A/C)
	24	RETURN
	25	END