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[u/mrichter/AliRoot.git] / ISAJET / isasusy / ssgx9.F

#include "isajet/pilot.h"
        REAL FUNCTION SSGX9(ET)
C-----------------------------------------------------------------------
C          SSGLBF: glss -> ziss + tp + tb
C          Baer's XT9 - XI'- eq. a.6.i of prd45,142 (1992)
C          Modified for t_1 and t_2 eigenstates
C-----------------------------------------------------------------------
#if defined(CERNLIB_IMPNONE)
      IMPLICIT NONE
#endif
#include "isajet/sssm.inc"
#include "isajet/sspar.inc"
#include "isajet/sstmp.inc"
        REAL ET
        DOUBLE PRECISION DET,DMG,DMT,DMZ,DMT1,DMT2,TOP,BOT,DXT9
        DOUBLE PRECISION XT,MUT,MUZ,XMIN,XMAX,EMIN,EMAX,SSDLAM
        DOUBLE PRECISION PI
        DATA PI/3.14159265D0/
        DET=ET
        DMG=TMP(1)
        DMT=TMP(2)
        DMZ=TMP(3)
        DMT1=TMP(4)
        DMT2=TMP(5)
        XT=2*DET/DMG
        MUT=(DMT/DMG)**2
        MUZ=(DMZ/DMG)**2
        XMIN=((2.D0-XT)*(1.D0+2*MUT-MUZ-XT)-DSQRT(DMAX1(0.D0,
     $   (XT**2-4*MUT)*SSDLAM((1.D0+MUT-XT),MUT,MUZ))))
     $   /2.D0/(1.D0-XT+MUT)
        XMAX=((2.D0-XT)*(1.D0+2*MUT-MUZ-XT)+DSQRT(DMAX1(0.D0,
     $   (XT**2-4*MUT)*SSDLAM((1.D0+MUT-XT),MUT,MUZ))))
     $   /2.D0/(1.D0-XT+MUT)
        EMIN=XMIN*DMG/2.D0
        EMAX=XMAX*DMG/2.D0
        TOP=DMG**2-2*DMG*EMAX+DMT**2-DMT1**2
        BOT=DMG**2-2*DMG*EMIN+DMT**2-DMT1**2
        DXT9=-PI**2*DET*DLOG(TOP/BOT)/2.D0/(DMG**2-2*DMG*DET+DMT**2
     $         -DMT2**2)
        SSGX9=DXT9
        RETURN
        END