1 #include "isajet/pilot.h"
2 REAL*8 FUNCTION ZJJ3(P1, P2, P3, P4, P5,NHEL,IM)
4 C Function generated by Madgraph + hand coding
5 C Returns amplitude squared summed/ave over colors
6 C for the point in phase space P1,P2,P3,P4,P5
7 C and helicity NHEL(1)...
8 C for the process: q(im) qb(im) -> z g g
9 C with Madgraph code IM
11 #if defined(CERNLIB_IMPNONE)
17 INTEGER NGRAPHS, NEIGEN, NEXTERNAL
18 PARAMETER (NGRAPHS= 8,NEIGEN= 2,NEXTERNAL=5)
24 REAL*8 P1(0:3),P2(0:3),P3(0:3),P4(0:3),P5(0:3)
25 INTEGER NHEL(NEXTERNAL),IM
30 REAL*8 EIGEN_VAL(NEIGEN), EIGEN_VEC(NGRAPHS,NEIGEN)
32 COMPLEX*16 AMP(NGRAPHS)
33 COMPLEX*16 W1(6) , W2(6) , W3(6) , W4(6) , W5(6)
34 COMPLEX*16 W6(6) , W7(6) , W8(6) , W9(6) , W10(6)
35 COMPLEX*16 W11(6) , W12(6) , W13(6) , W14(6) , W15(6)
40 #include "isajet/mgcoms.inc"
44 DATA EIGEN_VAL(1 )/ 7.7777777777777746D-01 /
45 DATA EIGEN_VEC(1 ,1 )/ -4.0824829046386302D-01 /
46 DATA EIGEN_VEC(2 ,1 )/ -4.0824829046386307D-01 /
47 DATA EIGEN_VEC(3 ,1 )/ 0.0000000000000000D+00 /
48 DATA EIGEN_VEC(4 ,1 )/ -4.0824829046386307D-01 /
49 DATA EIGEN_VEC(5 ,1 )/ -4.0824829046386302D-01 /
50 DATA EIGEN_VEC(6 ,1 )/ -4.0824829046386307D-01 /
51 DATA EIGEN_VEC(7 ,1 )/ 0.0000000000000000D+00 /
52 DATA EIGEN_VEC(8 ,1 )/ -4.0824829046386302D-01 /
53 DATA EIGEN_VAL(2 )/ 2.3333333333333321D+00 /
54 DATA EIGEN_VEC(1 ,2 )/ 2.6726124191242445D-01 /
55 DATA EIGEN_VEC(2 ,2 )/ -2.6726124191242440D-01 /
56 DATA EIGEN_VEC(3 ,2 )/ -5.3452248382484879D-01 /
57 DATA EIGEN_VEC(4 ,2 )/ -2.6726124191242440D-01 /
58 DATA EIGEN_VEC(5 ,2 )/ 2.6726124191242445D-01 /
59 DATA EIGEN_VEC(6 ,2 )/ -2.6726124191242440D-01 /
60 DATA EIGEN_VEC(7 ,2 )/ -5.3452248382484879D-01 /
61 DATA EIGEN_VEC(8 ,2 )/ 2.6726124191242445D-01 /
65 IF(IM.EQ.4.OR.IM.EQ.8.OR.IM.EQ.12) THEN
73 CALL IXXXXX(P1 ,FMASS(IM),NHEL(1 ), 1,W1 )
74 CALL OXXXXX(P2 ,FMASS(IM),NHEL(2 ),-1,W2 )
75 CALL VXXXXX(P3 ,ZMASS,NHEL(3 ), 1,W3 )
76 CALL VXXXXX(P4 , ZERO,NHEL(4 ), 1,W4 )
77 CALL VXXXXX(P5 , ZERO,NHEL(5 ), 1,W5 )
78 CALL FVOXXX(W2 ,W3 ,GZUD,FMASS(IM),FWIDTH(IM),W6 )
79 CALL FVOXXX(W6 ,W4 ,GG,FMASS(IM),FWIDTH(IM),W7 )
80 CALL IOVXXX(W1 ,W7 ,W5 ,GG,AMP(1 ))
81 CALL FVIXXX(W1 ,W4 ,GG,FMASS(IM),FWIDTH(IM),W8 )
82 CALL FVOXXX(W2 ,W5 ,GG,FMASS(IM),FWIDTH(IM),W9 )
83 CALL IOVXXX(W8 ,W9 ,W3 ,GZUD,AMP(2 ))
84 CALL JIOXXX(W1 ,W6 ,GG,ZERO,ZERO,W10 )
85 CALL GGGXXX(W5 ,W4 ,W10 ,G,AMP(3 ))
86 CALL IOVXXX(W8 ,W6 ,W5 ,GG,AMP(4 ))
87 CALL FVOXXX(W2 ,W4 ,GG,FMASS(IM),FWIDTH(IM),W11 )
88 CALL FVIXXX(W1 ,W5 ,GG,FMASS(IM),FWIDTH(IM),W12 )
89 CALL IOVXXX(W12 ,W11 ,W3 ,GZUD,AMP(5 ))
90 CALL FVIXXX(W1 ,W3 ,GZUD,FMASS(IM),FWIDTH(IM),W13 )
91 CALL FVIXXX(W13 ,W4 ,GG,FMASS(IM),FWIDTH(IM),W14 )
92 CALL IOVXXX(W14 ,W2 ,W5 ,GG,AMP(6 ))
93 CALL JIOXXX(W13 ,W2 ,GG,ZERO,ZERO,W15 )
94 CALL GGGXXX(W5 ,W4 ,W15 ,G,AMP(7 ))
95 CALL IOVXXX(W13 ,W11 ,W5 ,GG,AMP(8 ))
100 ZTEMP = ZTEMP + EIGEN_VEC(J,I)*AMP(J)
102 ZJJ3 =ZJJ3+ZTEMP*EIGEN_VAL(I)*CONJG(ZTEMP)