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0795afa3 | 1 | #include "isajet/pilot.h" |
2 | REAL*8 FUNCTION ZJJ1(P1, P2, P3, P4, P5,NHEL,IM1,IM2) | |
3 | C | |
4 | C Function generated by Madgraph + hand coding | |
5 | C Returns amplitude squared summed/avg over colors | |
6 | C for the point in phase space P1,P2,P3,P4,... | |
7 | C and helicity NHEL(1),NHEL(2),.... | |
8 | C for process : q(im1) q~(im1) -> z q(im2) q~(im2) | |
9 | C with Madgraph codes IM1 != IM2 | |
10 | C | |
11 | #if defined(CERNLIB_IMPNONE) | |
12 | IMPLICIT NONE | |
13 | #endif | |
14 | C | |
15 | C CONSTANTS | |
16 | C | |
17 | INTEGER NGRAPHS, NEIGEN, NEXTERNAL | |
18 | PARAMETER (NGRAPHS= 4,NEIGEN= 1,NEXTERNAL=5) | |
19 | REAL*8 ZERO | |
20 | PARAMETER (ZERO=0D0) | |
21 | C | |
22 | C ARGUMENTS | |
23 | C | |
24 | REAL*8 P1(0:3),P2(0:3),P3(0:3),P4(0:3),P5(0:3) | |
25 | INTEGER NHEL(NEXTERNAL) | |
26 | INTEGER IM1,IM2 | |
27 | C | |
28 | C LOCAL VARIABLES | |
29 | C | |
30 | INTEGER I,J | |
31 | REAL*8 EIGEN_VAL(NEIGEN), EIGEN_VEC(NGRAPHS,NEIGEN) | |
32 | COMPLEX*16 ZTEMP | |
33 | COMPLEX*16 AMP(NGRAPHS) | |
34 | COMPLEX*16 W1(6) , W2(6) , W3(6) , W4(6) , W5(6) | |
35 | COMPLEX*16 W6(6) , W7(6) , W8(6) , W9(6) , W10(6) | |
36 | COMPLEX*16 W11(6) , W12(6) | |
37 | C | |
38 | C GLOBAL VARIABLES | |
39 | C | |
40 | #include "isajet/mgcoms.inc" | |
41 | C | |
42 | C COLOR DATA | |
43 | C | |
44 | DATA EIGEN_VAL(1 )/ 8.8888888888888884D-01 / | |
45 | DATA EIGEN_VEC(1 ,1 )/ -5.0000000000000000D-01 / | |
46 | DATA EIGEN_VEC(2 ,1 )/ -5.0000000000000000D-01 / | |
47 | DATA EIGEN_VEC(3 ,1 )/ -5.0000000000000000D-01 / | |
48 | DATA EIGEN_VEC(4 ,1 )/ -5.0000000000000000D-01 / | |
49 | C ---------- | |
50 | C BEGIN CODE | |
51 | C ---------- | |
52 | CALL IXXXXX(P1 ,FMASS(IM1),NHEL(1 ), 1,W1 ) | |
53 | CALL OXXXXX(P2 ,FMASS(IM1),NHEL(2 ),-1,W2 ) | |
54 | CALL VXXXXX(P3 ,ZMASS,NHEL(3 ), 1,W3 ) | |
55 | CALL OXXXXX(P4 ,FMASS(IM2),NHEL(4 ), 1,W4 ) | |
56 | CALL IXXXXX(P5 ,FMASS(IM2),NHEL(5 ),-1,W5 ) | |
57 | IF(IM1.EQ.3.OR.IM1.EQ.7.OR.IM1.EQ.11) THEN | |
58 | CALL FVOXXX(W2 ,W3 ,GZD,FMASS(IM1),FWIDTH(IM1),W6 ) | |
59 | ELSE | |
60 | CALL FVOXXX(W2 ,W3 ,GZU,FMASS(IM1),FWIDTH(IM1),W6 ) | |
61 | ENDIF | |
62 | CALL JIOXXX(W1 ,W6 ,GG,ZERO,ZERO,W7 ) | |
63 | CALL IOVXXX(W5 ,W4 ,W7 ,GG,AMP(1 )) | |
64 | CALL FVIXXX(W1 ,W3 ,GZD,FMASS(IM1),FWIDTH(IM2),W8 ) | |
65 | CALL JIOXXX(W8 ,W2 ,GG,ZERO,ZERO,W9 ) | |
66 | CALL IOVXXX(W5 ,W4 ,W9 ,GG,AMP(2 )) | |
67 | CALL JIOXXX(W1 ,W2 ,GG,ZERO,ZERO,W10 ) | |
68 | CALL FVOXXX(W4 ,W10 ,GG,FMASS(IM2),FWIDTH(IM2),W11 ) | |
69 | CALL IOVXXX(W5 ,W11 ,W3 ,GZD,AMP(3 )) | |
70 | IF(IM2.EQ.3.OR.IM2.EQ.7.OR.IM2.EQ.11) THEN | |
71 | CALL FVOXXX(W4 ,W3 ,GZD,FMASS(IM2),FWIDTH(IM2),W12 ) | |
72 | ELSE | |
73 | CALL FVOXXX(W4 ,W3 ,GZU,FMASS(IM2),FWIDTH(IM2),W12 ) | |
74 | ENDIF | |
75 | CALL IOVXXX(W5 ,W12 ,W10 ,GG,AMP(4 )) | |
76 | ZJJ1 = 0.D0 | |
77 | DO I = 1, NEIGEN | |
78 | ZTEMP = (0.D0,0.D0) | |
79 | DO J = 1, NGRAPHS | |
80 | ZTEMP = ZTEMP + EIGEN_VEC(J,I)*AMP(J) | |
81 | ENDDO | |
82 | ZJJ1 =ZJJ1+ZTEMP*EIGEN_VAL(I)*CONJG(ZTEMP) | |
83 | ENDDO | |
84 | C CALL GAUGECHECK(AMP,ZTEMP,EIGEN_VEC,EIGEN_VAL,NGRAPHS,NEIGEN) | |
85 | END |