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subroutine jvtxxx(vc,tc,gt,vmass,vwidth , jvt)
c
c This subroutine computes an off-shell vector current from
c the coupling of two gauge bosons and a tensor boson.
c
c input:
c complex vc(6) : input vector v
c complex tc(18) : input tensor T
c complex gt : coupling constant gtv=-1/Lambda
c real vmass : mass of output vector v'
c real vwidth : width of output vector v'
c
c output:
c complex jvt(6) : vector current j^mu(v':v,T)
c
c- by Q.Li - OCT. 2006
c
implicit none
double complex vc(6), tc(18), gt, jvt(6)
double precision vmass, vwidth
double complex ft(6,4),TVM(4),TKM(4)
double precision MET(4,4)
double complex T12, T13, T14, T23, T24, T34, T00
double complex K2V1,K1V1
double complex TKK,TK2V1, dum
double precision pv1(4), pv2(4), F, pp2
integer i, j
double complex cZero
double precision rZero, rTwo
parameter( rZero = 0.0d0, rTwo = 2.0d0 )
parameter( cZero = ( 0.0d0, 0.0d0 ) )
ft(1,1) = tc(1)
ft(1,2) = tc(2)
ft(1,3) = tc(3)
ft(1,4) = tc(4)
ft(2,1) = tc(5)
ft(2,2) = tc(6)
ft(2,3) = tc(7)
ft(2,4) = tc(8)
ft(3,1) = tc(9)
ft(3,2) = tc(10)
ft(3,3) = tc(11)
ft(3,4) = tc(12)
ft(4,1) = tc(13)
ft(4,2) = tc(14)
ft(4,3) = tc(15)
ft(4,4) = tc(16)
ft(5,1) = tc(17)
ft(6,1) = tc(18)
jvt(5) = vc(5)+ft(5,1)
jvt(6) = vc(6)+ft(6,1)
pv1(1) = -dreal(vc(5))
pv1(2) = -dreal(vc(6))
pv1(3) = -dimag(vc(6))
pv1(4) = -dimag(vc(5))
pv2(1) = dreal(jvt(5))
pv2(2) = dreal(jvt(6))
pv2(3) = dimag(jvt(6))
pv2(4) = dimag(jvt(5))
do i=1,4
do j=1,4
MET(i,j) = 0.0d0
enddo
enddo
MET(1,1) = 1.0d0
MET(2,2) = -1.0d0
MET(3,3) = -1.0d0
MET(4,4) = -1.0d0
T00 = ft(1,1)-ft(2,2)-ft(3,3)-ft(4,4)
T12 = ft(1,2) + ft(2,1)
T13 = ft(1,3) + ft(3,1)
T14 = ft(1,4) + ft(4,1)
T23 = ft(2,3) + ft(3,2)
T24 = ft(2,4) + ft(4,2)
T34 = ft(3,4) + ft(4,3)
K2V1 = pv2(1)*vc(1) - pv2(2)*vc(2) - pv2(3)*vc(3) - pv2(4)*vc(4)
K1V1 = pv1(1)*vc(1) - pv1(2)*vc(2) - pv1(3)*vc(3) - pv1(4)*vc(4)
F = pv1(1)*pv2(1) - pv1(2)*pv2(2) - pv1(3)*pv2(3) - pv1(4)*pv2(4)
pp2 = pv2(1)**2 - pv2(2)**2 - pv2(3)**2 - pv2(4)**2
TKK = cZero
TK2V1 = cZero
do i = 1,4
dum = ft(i,i)*pv2(i)
TKK = TKK + dum*pv1(i)
dum = ft(i,i)*vc(i)
TK2V1 = TK2V1 + dum*pv2(i)
end do
TKK = rTwo*TKK
TK2V1 = rTwo*TK2V1
TKK = TKK - T12*(pv1(1)*pv2(2) + pv1(2)*pv2(1))
& - T13*(pv1(1)*pv2(3) + pv1(3)*pv2(1))
& - T14*(pv1(1)*pv2(4) + pv1(4)*pv2(1))
& + T23*(pv1(2)*pv2(3) + pv1(3)*pv2(2))
& + T24*(pv1(2)*pv2(4) + pv1(4)*pv2(2))
& + T34*(pv1(3)*pv2(4) + pv1(4)*pv2(3))
TK2V1 = TK2V1 - T12*(vc(1)*pv2(2) + vc(2)*pv2(1))
& - T13*(vc(1)*pv2(3) + vc(3)*pv2(1))
& - T14*(vc(1)*pv2(4) + vc(4)*pv2(1))
& + T23*(vc(2)*pv2(3) + vc(3)*pv2(2))
& + T24*(vc(2)*pv2(4) + vc(4)*pv2(2))
& + T34*(vc(3)*pv2(4) + vc(4)*pv2(3))
do j=1,4
TVM(j) =
&MET(j,1)*(ft(1,1)*vc(1)-ft(2,1)*vc(2)
&-ft(3,1)*vc(3)-ft(4,1)*vc(4))
&-MET(j,2)*(ft(1,2)*vc(1)-ft(2,2)*vc(2)
&-ft(3,2)*vc(3)-ft(4,2)*vc(4))
&-MET(j,3)*(ft(1,3)*vc(1)-ft(2,3)*vc(2)
&-ft(3,3)*vc(3)-ft(4,3)*vc(4))
&-MET(j,4)*(ft(1,4)*vc(1)-ft(2,4)*vc(2)
&-ft(3,4)*vc(3)-ft(4,4)*vc(4))
&+
&MET(j,1)*(ft(1,1)*vc(1)-ft(1,2)*vc(2)
&-ft(1,3)*vc(3)-ft(1,4)*vc(4))
&-MET(j,2)*(ft(2,1)*vc(1)-ft(2,2)*vc(2)
&-ft(2,3)*vc(3)-ft(2,4)*vc(4))
&-MET(j,3)*(ft(3,1)*vc(1)-ft(3,2)*vc(2)
&-ft(3,3)*vc(3)-ft(3,4)*vc(4))
&-MET(j,4)*(ft(4,1)*vc(1)-ft(4,2)*vc(2)
&-ft(4,3)*vc(3)-ft(4,4)*vc(4))
TKM(j) =
&MET(j,1)*(ft(1,1)*pv1(1)-ft(2,1)*pv1(2)
&-ft(3,1)*pv1(3)-ft(4,1)*pv1(4))
&-MET(j,2)*(ft(1,2)*pv1(1)-ft(2,2)*pv1(2)
&-ft(3,2)*pv1(3)-ft(4,2)*pv1(4))
&-MET(j,3)*(ft(1,3)*pv1(1)-ft(2,3)*pv1(2)
&-ft(3,3)*pv1(3)-ft(4,3)*pv1(4))
&-MET(j,4)*(ft(1,4)*pv1(1)-ft(2,4)*pv1(2)
&-ft(3,4)*pv1(3)-ft(4,4)*pv1(4))
&+
&MET(j,1)*(ft(1,1)*pv1(1)-ft(1,2)*pv1(2)
&-ft(1,3)*pv1(3)-ft(1,4)*pv1(4))
&-MET(j,2)*(ft(2,1)*pv1(1)-ft(2,2)*pv1(2)
&-ft(2,3)*pv1(3)-ft(2,4)*pv1(4))
&-MET(j,3)*(ft(3,1)*pv1(1)-ft(3,2)*pv1(2)
&-ft(3,3)*pv1(3)-ft(3,4)*pv1(4))
&-MET(j,4)*(ft(4,1)*pv1(1)-ft(4,2)*pv1(2)
&-ft(4,3)*pv1(3)-ft(4,4)*pv1(4))
enddo
if ( vmass.ne.rZero ) then
do i=1,4
jvt(i) = -(vmass**2+F)*T00*vc(i)
&+T00*K2V1*(pv1(i)+(1.0d0+F/vmass**2)*pv2(i)
&-F/vmass**2*pv2(i))
&+(vmass**2+F)*TVM(i)
&-TK2V1*pv1(i)
&-TK2V1*pv2(i)*(1.0d0+F/vmass**2)
&+TKK*vc(i)
&-K2V1*TKM(i)
&+F/vmass**2*TK2V1*pv2(i)
jvt(i)=jvt(i)*gt/dcmplx(pp2-vmass**2, vmass*vwidth )
enddo
else
do i=1,4
jvt(i) = -F*T00*vc(i)
&+K1V1*T00*(pv1(i)+pv2(i))
&+T00*K2V1*(pv1(i)+pv2(i))
&+F*TVM(i)
&-TK2V1*(pv1(i)+pv2(i))
&+TKK*vc(i)
&-(K2V1+K1V1)*TKM(i)
jvt(i)=jvt(i)*gt/dcmplx(pp2, 0.0d0)
enddo
endif
return
end
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