[u/mrichter/AliRoot.git] / TEvtGen / Tauola / tauola-fortran / curr_cleo.f



*AJW 1 version of CURR from KORALB.
      SUBROUTINE CURR_CLEO(MNUM,PIM1,PIM2,PIM3,PIM4,HADCUR)
C     ==================================================================
C AJW, 11/97 - based on original CURR from TAUOLA:
C     hadronic current for 4 pi final state
C     R. Fisher, J. Wess and F. Wagner Z. Phys C3 (1980) 313
C     R. Decker Z. Phys C36 (1987) 487.
C     M. Gell-Mann, D. Sharp, W. Wagner Phys. Rev. Lett 8 (1962) 261.
C BUT, rewritten to be more general and less "theoretical",
C  using parameters tuned by Vasia and DSC.
C     ==================================================================
 
      COMMON / PARMAS / AMTAU,AMNUTA,AMEL,AMNUE,AMMU,AMNUMU
     *                 ,AMPIZ,AMPI,AMRO,GAMRO,AMA1,GAMA1
     *                 ,AMK,AMKZ,AMKST,GAMKST
C
      REAL*4            AMTAU,AMNUTA,AMEL,AMNUE,AMMU,AMNUMU
     *                 ,AMPIZ,AMPI,AMRO,GAMRO,AMA1,GAMA1
     *                 ,AMK,AMKZ,AMKST,GAMKST
C
      REAL  PIM1(4),PIM2(4),PIM3(4),PIM4(4)
      COMPLEX HADCUR(4)

      INTEGER K,L,MNUM,K1,K2,IRO,I,J,KK
      REAL PA(4),PB(4),PAA(4)
      REAL AA(4,4),PP(4,4)
      REAL A,XM,XG,G1,G2,G,AMRO2,GAMRO2,AMRO3,GAMRO3,AMOM,GAMOM
      REAL FRO,COEF1,FPI,COEF2,QQ,SK,DENOM,SIG,QQA,SS23,SS24,SS34,QP1P2
      REAL QP1P3,QP1P4,P1P2,P1P3,P1P4,SIGN
      REAL PKORB,AMPA
      COMPLEX ALF0,ALF1,ALF2,ALF3
      COMPLEX LAM0,LAM1,LAM2,LAM3
      COMPLEX BET1,BET2,BET3
      COMPLEX FORM1,FORM2,FORM3,FORM4,FORM2PI
      COMPLEX BWIGM,WIGFOR,FPIKM,FPIKMD
      COMPLEX AMPL(7),AMPR
      COMPLEX BWIGN
C
      BWIGN(A,XM,XG)=1.0/CMPLX(A-XM**2,XM*XG)
C*******************************************************************************
C
C --- masses and constants
      IF (G1.NE.12.924) THEN
      G1=12.924
      G2=1475.98
      FPI=93.3E-3
      G =G1*G2
      FRO=0.266*AMRO**2
      COEF1=2.0*SQRT(3.0)/FPI**2
      COEF2=FRO*G ! overall constant for the omega current
      COEF2= COEF2*0.56  ! factor 0.56 reduces contribution of omega from 68% to 40 %

C masses and widths for for rho-prim and rho-bis:
      AMRO2 = 1.465
      GAMRO2= 0.310
      AMRO3=1.700
      GAMRO3=0.235
C
      AMOM  = PKORB(1,14)
      GAMOM = PKORB(2,14)
      AMRO2 = PKORB(1,21)
      GAMRO2= PKORB(2,21)
      AMRO3 = PKORB(1,22)
      GAMRO3= PKORB(2,22)
C
C Amplitudes for (pi-pi-pi0pi+) -> PS, rho0, rho-, rho+, omega.
      AMPL(1) = CMPLX(PKORB(3,31)*COEF1,0.)
      AMPL(2) = CMPLX(PKORB(3,32)*COEF1,0.)*CEXP(CMPLX(0.,PKORB(3,42)))
      AMPL(3) = CMPLX(PKORB(3,33)*COEF1,0.)*CEXP(CMPLX(0.,PKORB(3,43)))
      AMPL(4) = CMPLX(PKORB(3,34)*COEF1,0.)*CEXP(CMPLX(0.,PKORB(3,44)))
      AMPL(5) = CMPLX(PKORB(3,35)*COEF2,0.)*CEXP(CMPLX(0.,PKORB(3,45)))
C Amplitudes for (pi0pi0pi0pi-) -> PS, rho-.
      AMPL(6) = CMPLX(PKORB(3,36)*COEF1)
      AMPL(7) = CMPLX(PKORB(3,37)*COEF1)
C
C rho' contributions to rho' -> pi-omega:
      ALF0 = CMPLX(PKORB(3,51),0.0)
      ALF1 = CMPLX(PKORB(3,52)*AMRO**2,0.0)
      ALF2 = CMPLX(PKORB(3,53)*AMRO2**2,0.0)
      ALF3 = CMPLX(PKORB(3,54)*AMRO3**2,0.0)
C rho' contribtions to rho' -> rhopipi:
      LAM0 = CMPLX(PKORB(3,55),0.0)
      LAM1 = CMPLX(PKORB(3,56)*AMRO**2,0.0)
      LAM2 = CMPLX(PKORB(3,57)*AMRO2**2,0.0)
      LAM3 = CMPLX(PKORB(3,58)*AMRO3**2,0.0)
C rho contributions to rhopipi, rho -> 2pi:
      BET1 = CMPLX(PKORB(3,59)*AMRO**2,0.0)
      BET2 = CMPLX(PKORB(3,60)*AMRO2**2,0.0)
      BET3 = CMPLX(PKORB(3,61)*AMRO3**2,0.0)
C
      END IF
C**************************************************
C
C --- initialization of four vectors
      DO 7 K=1,4
      DO 8 L=1,4
 8    AA(K,L)=0.0
      HADCUR(K)=CMPLX(0.0)
      PAA(K)=PIM1(K)+PIM2(K)+PIM3(K)+PIM4(K)
      PP(1,K)=PIM1(K)
      PP(2,K)=PIM2(K)
      PP(3,K)=PIM3(K)
 7    PP(4,K)=PIM4(K)
C
      IF (MNUM.EQ.1) THEN
C ===================================================================
C pi- pi- p0 pi+ case                                            ====
C ===================================================================
       QQ=PAA(4)**2-PAA(3)**2-PAA(2)**2-PAA(1)**2

C  Add M(4pi)-dependence to rhopipi channels:
       FORM4= LAM0+LAM1*BWIGN(QQ,AMRO,GAMRO)
     *            +LAM2*BWIGN(QQ,AMRO2,GAMRO2)
     *            +LAM3*BWIGN(QQ,AMRO3,GAMRO3)

C --- loop over five contributions of the rho-pi-pi
       DO 201 K1=1,3
       DO 201 K2=3,4
C
         IF (K2.EQ.K1) THEN
           GOTO 201
         ELSEIF (K2.EQ.3) THEN
C rho-
            AMPR = AMPL(3)
            AMPA = AMPIZ
         ELSEIF (K1.EQ.3) THEN
C rho+
            AMPR = AMPL(4)
            AMPA = AMPIZ
         ELSE
C rho0
            AMPR = AMPL(2)
            AMPA = AMPI
         END IF
C
         SK=(PP(K1,4)+PP(K2,4))**2-(PP(K1,3)+PP(K2,3))**2
     $     -(PP(K1,2)+PP(K2,2))**2-(PP(K1,1)+PP(K2,1))**2

C -- definition of AA matrix
C -- cronecker delta
        DO 202 I=1,4
         DO 203 J=1,4
 203     AA(I,J)=0.0
 202    AA(I,I)=1.0
C ... and the rest ...
        DO 204 L=1,4
         IF (L.NE.K1.AND.L.NE.K2) THEN
          DENOM=(PAA(4)-PP(L,4))**2-(PAA(3)-PP(L,3))**2
     $         -(PAA(2)-PP(L,2))**2-(PAA(1)-PP(L,1))**2
          DO 205 I=1,4
          DO 205 J=1,4
                      SIG= 1.0
           IF(J.NE.4) SIG=-SIG
           AA(I,J)=AA(I,J)
     $            -SIG*(PAA(I)-2.0*PP(L,I))*(PAA(J)-PP(L,J))/DENOM
 205      CONTINUE
         ENDIF
 204    CONTINUE
C
C --- lets add something to HADCURR
C        FORM1= FPIKM(SQRT(SK),AMPI,AMPI) *FPIKM(SQRT(QQ),AMPI,AMPI)
C        FORM1= AMPL(1)+AMPR*FPIKM(SQRT(SK),AMPI,AMPI)

        FORM2PI= BET1*BWIGM(SK,AMRO,GAMRO,AMPA,AMPI)
     1          +BET2*BWIGM(SK,AMRO2,GAMRO2,AMPA,AMPI)
     2          +BET3*BWIGM(SK,AMRO3,GAMRO3,AMPA,AMPI)
        FORM1= AMPL(1)+AMPR*FORM2PI
C
       DO 206 I=1,4
       DO 206 J=1,4
        HADCUR(I)=HADCUR(I)+FORM1*FORM4*AA(I,J)*(PP(K1,J)-PP(K2,J))
 206   CONTINUE
C --- end of the rho-pi-pi current (5 possibilities)
 201   CONTINUE
C
C ===================================================================
C Now modify the coefficient for the omega-pi current:              =
C ===================================================================
       IF (AMPL(5).EQ.CMPLX(0.,0.)) GOTO 311

C Overall rho+rhoprime for the 4pi system:
C       FORM2=AMPL(5)*(BWIGN(QQ,AMRO,GAMRO)+ELPHA*BWIGN(QQ,AMROP,GAMROP))
C Modified M(4pi)-dependence:
       FORM2=AMPL(5)*(ALF0+ALF1*BWIGN(QQ,AMRO,GAMRO)
     *                    +ALF2*BWIGN(QQ,AMRO2,GAMRO2)
     *                    +ALF3*BWIGN(QQ,AMRO3,GAMRO3))
C
C --- there are two possibilities for omega current
C --- PA PB are corresponding first and second pi-s
       DO 301 KK=1,2
        DO 302 I=1,4
         PA(I)=PP(KK,I)
         PB(I)=PP(3-KK,I)
 302    CONTINUE
C --- lorentz invariants
         QQA=0.0
         SS23=0.0
         SS24=0.0
         SS34=0.0
         QP1P2=0.0
         QP1P3=0.0
         QP1P4=0.0
         P1P2 =0.0
         P1P3 =0.0
         P1P4 =0.0
        DO 303 K=1,4
                     SIGN=-1.0
         IF (K.EQ.4) SIGN= 1.0
         QQA=QQA+SIGN*(PAA(K)-PA(K))**2
         SS23=SS23+SIGN*(PB(K)  +PIM3(K))**2
         SS24=SS24+SIGN*(PB(K)  +PIM4(K))**2
         SS34=SS34+SIGN*(PIM3(K)+PIM4(K))**2
         QP1P2=QP1P2+SIGN*(PAA(K)-PA(K))*PB(K)
         QP1P3=QP1P3+SIGN*(PAA(K)-PA(K))*PIM3(K)
         QP1P4=QP1P4+SIGN*(PAA(K)-PA(K))*PIM4(K)
         P1P2=P1P2+SIGN*PA(K)*PB(K)
         P1P3=P1P3+SIGN*PA(K)*PIM3(K)
         P1P4=P1P4+SIGN*PA(K)*PIM4(K)
 303    CONTINUE
C
C omega -> rho pi for the 3pi system:
C       FORM3=BWIGN(QQA,AMOM,GAMOM)*(BWIGN(SS23,AMRO,GAMRO)+
C     $        BWIGN(SS24,AMRO,GAMRO)+BWIGN(SS34,AMRO,GAMRO))
C No omega -> rho pi; just straight omega:
        FORM3=BWIGN(QQA,AMOM,GAMOM)
C
        DO 304 K=1,4
         HADCUR(K)=HADCUR(K)+FORM2*FORM3*(
     $             PB  (K)*(QP1P3*P1P4-QP1P4*P1P3)
     $            +PIM3(K)*(QP1P4*P1P2-QP1P2*P1P4)
     $            +PIM4(K)*(QP1P2*P1P3-QP1P3*P1P2) )
 304    CONTINUE
 301   CONTINUE
 311   CONTINUE
C
      ELSE
C ===================================================================
C pi0 pi0 p0 pi- case                                            ====
C ===================================================================
       QQ=PAA(4)**2-PAA(3)**2-PAA(2)**2-PAA(1)**2

C --- loop over three contribution of the non-omega current
       DO 101 K=1,3
        SK=(PP(K,4)+PIM4(4))**2-(PP(K,3)+PIM4(3))**2
     $    -(PP(K,2)+PIM4(2))**2-(PP(K,1)+PIM4(1))**2

C -- definition of AA matrix
C -- cronecker delta
        DO 102 I=1,4
         DO 103 J=1,4
 103     AA(I,J)=0.0
 102    AA(I,I)=1.0
C
C ... and the rest ...
        DO 104 L=1,3
         IF (L.NE.K) THEN
          DENOM=(PAA(4)-PP(L,4))**2-(PAA(3)-PP(L,3))**2
     $         -(PAA(2)-PP(L,2))**2-(PAA(1)-PP(L,1))**2
          DO 105 I=1,4
          DO 105 J=1,4
                      SIG=1.0
           IF(J.NE.4) SIG=-SIG
           AA(I,J)=AA(I,J)
     $            -SIG*(PAA(I)-2.0*PP(L,I))*(PAA(J)-PP(L,J))/DENOM
 105      CONTINUE
         ENDIF
 104    CONTINUE

C --- lets add something to HADCURR
C       FORM1= FPIKM(SQRT(SK),AMPI,AMPI) *FPIKMD(SQRT(QQ),AMPI,AMPI)
CCCCCCCCCCCCC       FORM1=WIGFOR(SK,AMRO,GAMRO)        (tests)
C       FORM1= FPIKM(SQRT(SK),AMPI,AMPI) *FPIKM(SQRT(QQ),AMPI,AMPI)
       FORM1 = AMPL(6)+AMPL(7)*FPIKM(SQRT(SK),AMPI,AMPI)

        DO 106 I=1,4
        DO 106 J=1,4
         HADCUR(I)=HADCUR(I)+FORM1*AA(I,J)*(PP(K,J)-PP(4,J))
 106    CONTINUE
C --- end of the non omega current (3 possibilities)
 101   CONTINUE

      ENDIF
      END
Commit	Line	Data
0ca57c2f	1
	2
	3	*AJW 1 version of CURR from KORALB.
	4	SUBROUTINE CURR_CLEO(MNUM,PIM1,PIM2,PIM3,PIM4,HADCUR)
	5	C ==================================================================
	6	C AJW, 11/97 - based on original CURR from TAUOLA:
	7	C hadronic current for 4 pi final state
	8	C R. Fisher, J. Wess and F. Wagner Z. Phys C3 (1980) 313
	9	C R. Decker Z. Phys C36 (1987) 487.
	10	C M. Gell-Mann, D. Sharp, W. Wagner Phys. Rev. Lett 8 (1962) 261.
	11	C BUT, rewritten to be more general and less "theoretical",
	12	C using parameters tuned by Vasia and DSC.
	13	C ==================================================================
	14
	15	COMMON / PARMAS / AMTAU,AMNUTA,AMEL,AMNUE,AMMU,AMNUMU
	16	* ,AMPIZ,AMPI,AMRO,GAMRO,AMA1,GAMA1
	17	* ,AMK,AMKZ,AMKST,GAMKST
	18	C
	19	REAL*4 AMTAU,AMNUTA,AMEL,AMNUE,AMMU,AMNUMU
	20	* ,AMPIZ,AMPI,AMRO,GAMRO,AMA1,GAMA1
	21	* ,AMK,AMKZ,AMKST,GAMKST
	22	C
	23	REAL PIM1(4),PIM2(4),PIM3(4),PIM4(4)
	24	COMPLEX HADCUR(4)
	25
	26	INTEGER K,L,MNUM,K1,K2,IRO,I,J,KK
	27	REAL PA(4),PB(4),PAA(4)
	28	REAL AA(4,4),PP(4,4)
	29	REAL A,XM,XG,G1,G2,G,AMRO2,GAMRO2,AMRO3,GAMRO3,AMOM,GAMOM
	30	REAL FRO,COEF1,FPI,COEF2,QQ,SK,DENOM,SIG,QQA,SS23,SS24,SS34,QP1P2
	31	REAL QP1P3,QP1P4,P1P2,P1P3,P1P4,SIGN
	32	REAL PKORB,AMPA
	33	COMPLEX ALF0,ALF1,ALF2,ALF3
	34	COMPLEX LAM0,LAM1,LAM2,LAM3
	35	COMPLEX BET1,BET2,BET3
	36	COMPLEX FORM1,FORM2,FORM3,FORM4,FORM2PI
	37	COMPLEX BWIGM,WIGFOR,FPIKM,FPIKMD
	38	COMPLEX AMPL(7),AMPR
	39	COMPLEX BWIGN
	40	C
	41	BWIGN(A,XM,XG)=1.0/CMPLX(A-XM*2,XMXG)
	42	C*******************************************************************************
	43	C
	44	C --- masses and constants
	45	IF (G1.NE.12.924) THEN
	46	G1=12.924
	47	G2=1475.98
	48	FPI=93.3E-3
	49	G =G1*G2
	50	FRO=0.266AMRO*2
	51	COEF1=2.0SQRT(3.0)/FPI*2
	52	COEF2=FRO*G ! overall constant for the omega current
	53	COEF2= COEF2*0.56 ! factor 0.56 reduces contribution of omega from 68% to 40 %
	54
	55	C masses and widths for for rho-prim and rho-bis:
	56	AMRO2 = 1.465
	57	GAMRO2= 0.310
	58	AMRO3=1.700
	59	GAMRO3=0.235
	60	C
	61	AMOM = PKORB(1,14)
	62	GAMOM = PKORB(2,14)
	63	AMRO2 = PKORB(1,21)
	64	GAMRO2= PKORB(2,21)
65	AMRO3 = PKORB(1,22)
66	GAMRO3= PKORB(2,22)
67	C
68	C Amplitudes for (pi-pi-pi0pi+) -> PS, rho0, rho-, rho+, omega.
69	AMPL(1) = CMPLX(PKORB(3,31)*COEF1,0.)
70	AMPL(2) = CMPLX(PKORB(3,32)COEF1,0.)CEXP(CMPLX(0.,PKORB(3,42)))
71	AMPL(3) = CMPLX(PKORB(3,33)COEF1,0.)CEXP(CMPLX(0.,PKORB(3,43)))
72	AMPL(4) = CMPLX(PKORB(3,34)COEF1,0.)CEXP(CMPLX(0.,PKORB(3,44)))
73	AMPL(5) = CMPLX(PKORB(3,35)COEF2,0.)CEXP(CMPLX(0.,PKORB(3,45)))
74	C Amplitudes for (pi0pi0pi0pi-) -> PS, rho-.
75	AMPL(6) = CMPLX(PKORB(3,36)*COEF1)
76	AMPL(7) = CMPLX(PKORB(3,37)*COEF1)
77	C
78	C rho' contributions to rho' -> pi-omega:
79	ALF0 = CMPLX(PKORB(3,51),0.0)
80	ALF1 = CMPLX(PKORB(3,52)AMRO*2,0.0)
81	ALF2 = CMPLX(PKORB(3,53)AMRO2*2,0.0)
82	ALF3 = CMPLX(PKORB(3,54)AMRO3*2,0.0)
83	C rho' contribtions to rho' -> rhopipi:
84	LAM0 = CMPLX(PKORB(3,55),0.0)
85	LAM1 = CMPLX(PKORB(3,56)AMRO*2,0.0)
86	LAM2 = CMPLX(PKORB(3,57)AMRO2*2,0.0)
87	LAM3 = CMPLX(PKORB(3,58)AMRO3*2,0.0)
88	C rho contributions to rhopipi, rho -> 2pi:
89	BET1 = CMPLX(PKORB(3,59)AMRO*2,0.0)
90	BET2 = CMPLX(PKORB(3,60)AMRO2*2,0.0)
91	BET3 = CMPLX(PKORB(3,61)AMRO3*2,0.0)
92	C
93	END IF
94	C**************************************************
95	C
96	C --- initialization of four vectors
97	DO 7 K=1,4
98	DO 8 L=1,4
99	8 AA(K,L)=0.0
100	HADCUR(K)=CMPLX(0.0)
101	PAA(K)=PIM1(K)+PIM2(K)+PIM3(K)+PIM4(K)
102	PP(1,K)=PIM1(K)
103	PP(2,K)=PIM2(K)
104	PP(3,K)=PIM3(K)
105	7 PP(4,K)=PIM4(K)
106	C
107	IF (MNUM.EQ.1) THEN
108	C ===================================================================
109	C pi- pi- p0 pi+ case ====
110	C ===================================================================
111	QQ=PAA(4)2-PAA(3)2-PAA(2)2-PAA(1)2
112
113	C Add M(4pi)-dependence to rhopipi channels:
114	FORM4= LAM0+LAM1*BWIGN(QQ,AMRO,GAMRO)
115	* +LAM2*BWIGN(QQ,AMRO2,GAMRO2)
116	* +LAM3*BWIGN(QQ,AMRO3,GAMRO3)
117
118	C --- loop over five contributions of the rho-pi-pi
119	DO 201 K1=1,3
120	DO 201 K2=3,4
121	C
122	IF (K2.EQ.K1) THEN
123	GOTO 201
124	ELSEIF (K2.EQ.3) THEN
125	C rho-
126	AMPR = AMPL(3)
127	AMPA = AMPIZ
128	ELSEIF (K1.EQ.3) THEN
129	C rho+
130	AMPR = AMPL(4)
131	AMPA = AMPIZ
132	ELSE
133	C rho0
134	AMPR = AMPL(2)
135	AMPA = AMPI
136	END IF
137	C
138	SK=(PP(K1,4)+PP(K2,4))2-(PP(K1,3)+PP(K2,3))2
139	$ -(PP(K1,2)+PP(K2,2))2-(PP(K1,1)+PP(K2,1))2
140
141	C -- definition of AA matrix
142	C -- cronecker delta
143	DO 202 I=1,4
144	DO 203 J=1,4
145	203 AA(I,J)=0.0
146	202 AA(I,I)=1.0
147	C ... and the rest ...
148	DO 204 L=1,4
149	IF (L.NE.K1.AND.L.NE.K2) THEN
150	DENOM=(PAA(4)-PP(L,4))2-(PAA(3)-PP(L,3))2
151	$ -(PAA(2)-PP(L,2))2-(PAA(1)-PP(L,1))2
152	DO 205 I=1,4
153	DO 205 J=1,4
154	SIG= 1.0
155	IF(J.NE.4) SIG=-SIG
156	AA(I,J)=AA(I,J)
157	$ -SIG(PAA(I)-2.0PP(L,I))*(PAA(J)-PP(L,J))/DENOM
158	205 CONTINUE
159	ENDIF
160	204 CONTINUE
161	C
162	C --- lets add something to HADCURR
163	C FORM1= FPIKM(SQRT(SK),AMPI,AMPI) *FPIKM(SQRT(QQ),AMPI,AMPI)
164	C FORM1= AMPL(1)+AMPR*FPIKM(SQRT(SK),AMPI,AMPI)
165
166	FORM2PI= BET1*BWIGM(SK,AMRO,GAMRO,AMPA,AMPI)
167	1 +BET2*BWIGM(SK,AMRO2,GAMRO2,AMPA,AMPI)
168	2 +BET3*BWIGM(SK,AMRO3,GAMRO3,AMPA,AMPI)
169	FORM1= AMPL(1)+AMPR*FORM2PI
170	C
171	DO 206 I=1,4
172	DO 206 J=1,4
173	HADCUR(I)=HADCUR(I)+FORM1FORM4AA(I,J)*(PP(K1,J)-PP(K2,J))
174	206 CONTINUE
175	C --- end of the rho-pi-pi current (5 possibilities)
176	201 CONTINUE
177	C
178	C ===================================================================
179	C Now modify the coefficient for the omega-pi current: =
180	C ===================================================================
181	IF (AMPL(5).EQ.CMPLX(0.,0.)) GOTO 311
182
183	C Overall rho+rhoprime for the 4pi system:
184	C FORM2=AMPL(5)(BWIGN(QQ,AMRO,GAMRO)+ELPHABWIGN(QQ,AMROP,GAMROP))
185	C Modified M(4pi)-dependence:
186	FORM2=AMPL(5)(ALF0+ALF1BWIGN(QQ,AMRO,GAMRO)
187	* +ALF2*BWIGN(QQ,AMRO2,GAMRO2)
188	* +ALF3*BWIGN(QQ,AMRO3,GAMRO3))
189	C
190	C --- there are two possibilities for omega current
191	C --- PA PB are corresponding first and second pi-s
192	DO 301 KK=1,2
193	DO 302 I=1,4
194	PA(I)=PP(KK,I)
195	PB(I)=PP(3-KK,I)
196	302 CONTINUE
197	C --- lorentz invariants
198	QQA=0.0
199	SS23=0.0
200	SS24=0.0
201	SS34=0.0
202	QP1P2=0.0
203	QP1P3=0.0
204	QP1P4=0.0
205	P1P2 =0.0
206	P1P3 =0.0
207	P1P4 =0.0
208	DO 303 K=1,4
209	SIGN=-1.0
210	IF (K.EQ.4) SIGN= 1.0
211	QQA=QQA+SIGN(PAA(K)-PA(K))*2
212	SS23=SS23+SIGN(PB(K) +PIM3(K))*2
213	SS24=SS24+SIGN(PB(K) +PIM4(K))*2
214	SS34=SS34+SIGN(PIM3(K)+PIM4(K))*2
215	QP1P2=QP1P2+SIGN(PAA(K)-PA(K))PB(K)
216	QP1P3=QP1P3+SIGN(PAA(K)-PA(K))PIM3(K)
217	QP1P4=QP1P4+SIGN(PAA(K)-PA(K))PIM4(K)
218	P1P2=P1P2+SIGNPA(K)PB(K)
219	P1P3=P1P3+SIGNPA(K)PIM3(K)
220	P1P4=P1P4+SIGNPA(K)PIM4(K)
221	303 CONTINUE
222	C
223	C omega -> rho pi for the 3pi system:
224	C FORM3=BWIGN(QQA,AMOM,GAMOM)*(BWIGN(SS23,AMRO,GAMRO)+
225	C $ BWIGN(SS24,AMRO,GAMRO)+BWIGN(SS34,AMRO,GAMRO))
226	C No omega -> rho pi; just straight omega:
227	FORM3=BWIGN(QQA,AMOM,GAMOM)
228	C
229	DO 304 K=1,4
230	HADCUR(K)=HADCUR(K)+FORM2FORM3(
231	$ PB (K)(QP1P3P1P4-QP1P4*P1P3)
232	$ +PIM3(K)(QP1P4P1P2-QP1P2*P1P4)
233	$ +PIM4(K)(QP1P2P1P3-QP1P3*P1P2) )
234	304 CONTINUE
235	301 CONTINUE
236	311 CONTINUE
237	C
238	ELSE
239	C ===================================================================
240	C pi0 pi0 p0 pi- case ====
241	C ===================================================================
242	QQ=PAA(4)2-PAA(3)2-PAA(2)2-PAA(1)2
243
244	C --- loop over three contribution of the non-omega current
245	DO 101 K=1,3
246	SK=(PP(K,4)+PIM4(4))2-(PP(K,3)+PIM4(3))2
247	$ -(PP(K,2)+PIM4(2))2-(PP(K,1)+PIM4(1))2
248
249	C -- definition of AA matrix
250	C -- cronecker delta
251	DO 102 I=1,4
252	DO 103 J=1,4
253	103 AA(I,J)=0.0
254	102 AA(I,I)=1.0
255	C
256	C ... and the rest ...
257	DO 104 L=1,3
258	IF (L.NE.K) THEN
259	DENOM=(PAA(4)-PP(L,4))2-(PAA(3)-PP(L,3))2
260	$ -(PAA(2)-PP(L,2))2-(PAA(1)-PP(L,1))2
261	DO 105 I=1,4
262	DO 105 J=1,4
263	SIG=1.0
264	IF(J.NE.4) SIG=-SIG
265	AA(I,J)=AA(I,J)
266	$ -SIG(PAA(I)-2.0PP(L,I))*(PAA(J)-PP(L,J))/DENOM
267	105 CONTINUE
268	ENDIF
269	104 CONTINUE
270
271	C --- lets add something to HADCURR
272	C FORM1= FPIKM(SQRT(SK),AMPI,AMPI) *FPIKMD(SQRT(QQ),AMPI,AMPI)
273	CCCCCCCCCCCCC FORM1=WIGFOR(SK,AMRO,GAMRO) (tests)
274	C FORM1= FPIKM(SQRT(SK),AMPI,AMPI) *FPIKM(SQRT(QQ),AMPI,AMPI)
275	FORM1 = AMPL(6)+AMPL(7)*FPIKM(SQRT(SK),AMPI,AMPI)
276
277	DO 106 I=1,4
278	DO 106 J=1,4
279	HADCUR(I)=HADCUR(I)+FORM1AA(I,J)(PP(K,J)-PP(4,J))
280	106 CONTINUE
281	C --- end of the non omega current (3 possibilities)
282	101 CONTINUE
283
284	ENDIF
285	END
286
287
288