#include "isajet/pilot.h"
      REAL*8 FUNCTION ZJJ3(P1, P2, P3, P4, P5,NHEL,IM)
C
C Function generated by Madgraph + hand coding
C Returns amplitude squared summed/ave over colors
C for the point in phase space P1,P2,P3,P4,P5
C and helicity NHEL(1)...
C for the process: q(im) qb(im) -> z g g
C with Madgraph code IM
C
#if defined(CERNLIB_IMPNONE)
      IMPLICIT NONE
#endif
C  
C CONSTANTS
C  
      INTEGER    NGRAPHS,    NEIGEN,    NEXTERNAL       
      PARAMETER (NGRAPHS=  8,NEIGEN=  2,NEXTERNAL=5)    
      REAL*8     ZERO
      PARAMETER (ZERO=0D0)
C  
C ARGUMENTS 
C  
      REAL*8 P1(0:3),P2(0:3),P3(0:3),P4(0:3),P5(0:3)                             
      INTEGER NHEL(NEXTERNAL),IM
C  
C LOCAL VARIABLES 
C  
      INTEGER I,J
      REAL*8 EIGEN_VAL(NEIGEN), EIGEN_VEC(NGRAPHS,NEIGEN)
      COMPLEX*16 ZTEMP
      COMPLEX*16 AMP(NGRAPHS)
      COMPLEX*16 W1(6)  , W2(6)  , W3(6)  , W4(6)  , W5(6)        
      COMPLEX*16 W6(6)  , W7(6)  , W8(6)  , W9(6)  , W10(6)       
      COMPLEX*16 W11(6) , W12(6) , W13(6) , W14(6) , W15(6) 
      REAL*8 GZUD(2)
C  
C GLOBAL VARIABLES
C  
#include "isajet/mgcoms.inc"
C  
C COLOR DATA
C  
      DATA EIGEN_VAL(1  )/       7.7777777777777746D-01 /                  
      DATA EIGEN_VEC(1  ,1  )/  -4.0824829046386302D-01 /                  
      DATA EIGEN_VEC(2  ,1  )/  -4.0824829046386307D-01 /                  
      DATA EIGEN_VEC(3  ,1  )/   0.0000000000000000D+00 /                  
      DATA EIGEN_VEC(4  ,1  )/  -4.0824829046386307D-01 /                  
      DATA EIGEN_VEC(5  ,1  )/  -4.0824829046386302D-01 /                  
      DATA EIGEN_VEC(6  ,1  )/  -4.0824829046386307D-01 /                  
      DATA EIGEN_VEC(7  ,1  )/   0.0000000000000000D+00 /                  
      DATA EIGEN_VEC(8  ,1  )/  -4.0824829046386302D-01 /                  
      DATA EIGEN_VAL(2  )/       2.3333333333333321D+00 /                  
      DATA EIGEN_VEC(1  ,2  )/   2.6726124191242445D-01 /                  
      DATA EIGEN_VEC(2  ,2  )/  -2.6726124191242440D-01 /                  
      DATA EIGEN_VEC(3  ,2  )/  -5.3452248382484879D-01 /                  
      DATA EIGEN_VEC(4  ,2  )/  -2.6726124191242440D-01 /                  
      DATA EIGEN_VEC(5  ,2  )/   2.6726124191242445D-01 /                  
      DATA EIGEN_VEC(6  ,2  )/  -2.6726124191242440D-01 /                  
      DATA EIGEN_VEC(7  ,2  )/  -5.3452248382484879D-01 /                  
      DATA EIGEN_VEC(8  ,2  )/   2.6726124191242445D-01 /                  
C ----------
C BEGIN CODE
C ----------
      IF(IM.EQ.4.OR.IM.EQ.8.OR.IM.EQ.12) THEN
        GZUD(1)=GZD(1)
        GZUD(2)=GZD(2)
      ELSE
        GZUD(1)=GZU(1)
        GZUD(2)=GZU(2)
      ENDIF
C
      CALL IXXXXX(P1  ,FMASS(IM),NHEL(1  ), 1,W1  )                       
      CALL OXXXXX(P2  ,FMASS(IM),NHEL(2  ),-1,W2  )                       
      CALL VXXXXX(P3  ,ZMASS,NHEL(3  ), 1,W3  )                            
      CALL VXXXXX(P4  , ZERO,NHEL(4  ), 1,W4  )                            
      CALL VXXXXX(P5  , ZERO,NHEL(5  ), 1,W5  )                            
      CALL FVOXXX(W2  ,W3  ,GZUD,FMASS(IM),FWIDTH(IM),W6  )               
      CALL FVOXXX(W6  ,W4  ,GG,FMASS(IM),FWIDTH(IM),W7  )                
      CALL IOVXXX(W1  ,W7  ,W5  ,GG,AMP(1  ))                              
      CALL FVIXXX(W1  ,W4  ,GG,FMASS(IM),FWIDTH(IM),W8  )                
      CALL FVOXXX(W2  ,W5  ,GG,FMASS(IM),FWIDTH(IM),W9  )                
      CALL IOVXXX(W8  ,W9  ,W3  ,GZUD,AMP(2  ))                             
      CALL JIOXXX(W1  ,W6  ,GG,ZERO,ZERO,W10 )                             
      CALL GGGXXX(W5  ,W4  ,W10 ,G,AMP(3  ))                               
      CALL IOVXXX(W8  ,W6  ,W5  ,GG,AMP(4  ))                              
      CALL FVOXXX(W2  ,W4  ,GG,FMASS(IM),FWIDTH(IM),W11 )                
      CALL FVIXXX(W1  ,W5  ,GG,FMASS(IM),FWIDTH(IM),W12 )                
      CALL IOVXXX(W12 ,W11 ,W3  ,GZUD,AMP(5  ))                             
      CALL FVIXXX(W1  ,W3  ,GZUD,FMASS(IM),FWIDTH(IM),W13 )               
      CALL FVIXXX(W13 ,W4  ,GG,FMASS(IM),FWIDTH(IM),W14 )                
      CALL IOVXXX(W14 ,W2  ,W5  ,GG,AMP(6  ))                              
      CALL JIOXXX(W13 ,W2  ,GG,ZERO,ZERO,W15 )                             
      CALL GGGXXX(W5  ,W4  ,W15 ,G,AMP(7  ))                               
      CALL IOVXXX(W13 ,W11 ,W5  ,GG,AMP(8  ))                              
      ZJJ3 = 0.D0 
      DO I = 1, NEIGEN
          ZTEMP = (0.D0,0.D0)
          DO J = 1, NGRAPHS
              ZTEMP = ZTEMP + EIGEN_VEC(J,I)*AMP(J)
          ENDDO
          ZJJ3 =ZJJ3+ZTEMP*EIGEN_VAL(I)*CONJG(ZTEMP) 
      ENDDO
      END