ISAJET/isasusy/ssgwt8.F

   1 #include "isajet/pilot.h"
   2         REAL FUNCTION SSGWT8(E)
   3 C-----------------------------------------------------------------------
   4 C          SSGLBF: glss -> wiss + tp + bb
   5 C          Baer's FTBW13/  Drees' G_8
   6 C-----------------------------------------------------------------------
   7 #if defined(CERNLIB_IMPNONE)
   8       IMPLICIT NONE
   9 #endif
  10 #include "isajet/sssm.inc"
  11 #include "isajet/sspar.inc"
  12 #include "isajet/sstmp.inc"
  13         REAL E
  14         DOUBLE PRECISION ET,MWI,MG,MT,MST1,MST2,PT,EBMX,EBMN
  15         DOUBLE PRECISION TOP,BOT,DFTBW
  16         DOUBLE PRECISION MB,Z,RDL,DEN,R1,R2,R3,SSDLAM
  17 C
  18         ET=E
  19         MWI=TMP(1)
  20         MG=TMP(2)
  21         MT=TMP(3)
  22         MST1=TMP(6)
  23         MST2=TMP(7)
  24         MB=AMBT
  25 C
  26 C            Rewrite PT=DSQRT(ET**2-MT**2)
  27         PT=DSQRT((ET-MT)*(ET+MT))
  28         Z=(MG**2+MT**2-2*MG*ET+MB**2-MWI**2)/2.
  29         R1=1.D0+MT**2/MG**2-2.D0*ET/MG
  30         R2=MB**2/MG**2
  31         R3=MWI**2/MG**2
  32         RDL=DSQRT(DMAX1(0.D0,SSDLAM(R1,R2,R3)))
  33         DEN=MG**2+MT**2-2*ET*MG
  34         EBMX=(2*Z*(1.D0-ET/MG)+PT*MG*RDL)*MG/2.D0/DEN
  35         EBMN=(2*Z*(1.D0-ET/MG)-PT*MG*RDL)*MG/2.D0/DEN
  36         TOP=(MG**2+MT**2-2*MG*ET-MWI**2)*(EBMX-EBMN)
  37         BOT=(MG**2+MT**2-2*MG*ET-MST1**2)*
  38      $  (MG**2+MT**2-2*MG*ET-MST2**2)
  39         DFTBW=-MG*MT*TOP/BOT
  40         SSGWT8=DFTBW
  41         RETURN
  42         END