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

*
* $Id$
*
* $Log$
* Revision 1.1.1.2  1996/10/30 08:28:30  cernlib
* Version 7.04
*
* Revision 1.1.1.1  1996/04/12 15:29:22  plothow
* Version 7.01
*
*
#include "pdf/pilot.h"
      FUNCTION GHRXI(Y,SQ)
C
C  STRUCTURE FUNCTION ANTIQUARK FROM A PROTON
      ASQ=ABS(SQ)
      SI=1.
      IF (ASQ.GT.0.) SI=SQ/ABS(SQ)
      A=0.25+0.088*SI*ASQ**1.3
      B=0.8128*SQ-2.003*SI*ASQ**1.8+0.0831*SQ**2
      C=3.97*SQ
      D=7.0+1.666*SQ
      E=0.2487*SI*ASQ**2.5
      F=27.80+59.68*SQ
      GHRXI=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 08:28:30 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 GHRXI(Y,SQ)
	14	C
	15	C STRUCTURE FUNCTION ANTIQUARK FROM A PROTON
	16	ASQ=ABS(SQ)
	17	SI=1.
	18	IF (ASQ.GT.0.) SI=SQ/ABS(SQ)
	19	A=0.25+0.088SIASQ**1.3
	20	B=0.8128SQ-2.003SIASQ1.8+0.0831SQ**2
	21	C=3.97*SQ
	22	D=7.0+1.666*SQ
	23	E=0.2487SIASQ**2.5
	24	F=27.80+59.68*SQ
	25	GHRXI=A(1.0+BY+CY2)(1.0-Y)*D+E EXP(-F*Y)
	26	RETURN
	27	END