[u/mrichter/AliRoot.git] / ISAJET / code / zjj3.F

#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
Commit	Line	Data
0795afa3	1	#include "isajet/pilot.h"
	2	REAL*8 FUNCTION ZJJ3(P1, P2, P3, P4, P5,NHEL,IM)
	3	C
	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
	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= 8,NEIGEN= 2,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),IM
	26	C
	27	C LOCAL VARIABLES
	28	C
	29	INTEGER I,J
	30	REAL*8 EIGEN_VAL(NEIGEN), EIGEN_VEC(NGRAPHS,NEIGEN)
	31	COMPLEX*16 ZTEMP
	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)
	36	REAL*8 GZUD(2)
	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 )/ 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 /
	62	C ----------
	63	C BEGIN CODE
	64	C ----------
65	IF(IM.EQ.4.OR.IM.EQ.8.OR.IM.EQ.12) THEN
66	GZUD(1)=GZD(1)
67	GZUD(2)=GZD(2)
68	ELSE
69	GZUD(1)=GZU(1)
70	GZUD(2)=GZU(2)
71	ENDIF
72	C
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 ))
96	ZJJ3 = 0.D0
97	DO I = 1, NEIGEN
98	ZTEMP = (0.D0,0.D0)
99	DO J = 1, NGRAPHS
100	ZTEMP = ZTEMP + EIGEN_VEC(J,I)*AMP(J)
101	ENDDO
102	ZJJ3 =ZJJ3+ZTEMPEIGEN_VAL(I)CONJG(ZTEMP)
103	ENDDO
104	END