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

*
* $Id$
*
* $Log$
* Revision 1.1.1.2  1996/10/30 08:28:31  cernlib
* Version 7.04
*
* Revision 1.1.1.1  1996/04/12 15:29:22  plothow
* Version 7.01
*
*
#include "pdf/pilot.h"
      FUNCTION GHRXS(Y,SQ)
C
C  STRUCTURE FUNCTION  S-QUARK FROM A PROTON
      ASQ=ABS(SQ)
      SI=1.
      IF ( ASQ.GT.0.) SI=SQ/ABS(SQ)
      A=0.0625+0.1132*SI*ASQ**1.3
      B=12.64*SQ-51.70*SI*ASQ**1.8+38.02*SQ**2
      C=4.448*SQ
      D=7.0+1.562*SQ
      E=0.3081*SI*ASQ**2.5
      F=47.24+67.91*SQ
      GHRXS=A*(1.0+B*Y+C*Y**2)*(1.0-Y)**D+E* EXP(-F*Y)
      RETURN
      END
Commit	Line	Data
21886bb6	1	*
	2	* $Id$
	3	*
	4	* $Log$
	5	* Revision 1.1.1.2 1996/10/30 08:28:31 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 GHRXS(Y,SQ)
	14	C
	15	C STRUCTURE FUNCTION S-QUARK FROM A PROTON
	16	ASQ=ABS(SQ)
	17	SI=1.
	18	IF ( ASQ.GT.0.) SI=SQ/ABS(SQ)
	19	A=0.0625+0.1132SIASQ**1.3
	20	B=12.64SQ-51.70SIASQ1.8+38.02SQ**2
	21	C=4.448*SQ
	22	D=7.0+1.562*SQ
	23	E=0.3081SIASQ**2.5
	24	F=47.24+67.91*SQ
	25	GHRXS=A(1.0+BY+CY2)(1.0-Y)*D+E EXP(-F*Y)
	26	RETURN
	27	END