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subroutine ftoxxx(fo,tc,gt,fmass,fwidth , fto)
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c This subroutine computes an off-shell fermion wavefunction from a
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c flowing-OUT external fermion and a tensor boson.
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c complex fo(6) : flow-out fermion <fo|
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c complex tc(18) : input tensor T
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c complex gt : coupling constant gtf=-1/Lambda/4
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c real fmass : mass of output fermion f'
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c real fwidth : width of output fermion f'
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c complex fto(6) : off-shell fermion <fo,T:f'|
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c- by Q.Li - OCT. 2006
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double complex fo(6), tc(18), gt, fto(6)
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double precision fmass, fwidth
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double complex ft(6,4)
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double complex T11, T22, T33, T44, T12, T13, T14, T23, T24, T34
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double precision p(4), k(4), p2
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double precision rZero, r2,rtwo
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parameter( rZero = 0.0d0, r2 = 2.0d0,rtwo=2.0d0 )
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parameter( ci = ( 0.0d0, 1.0d0 ) )
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fto(5) = fo(5) + ft(5,1)
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fto(6) = fo(6) + ft(6,1)
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p2 = p(1)**2 - p(2)**2 - p(3)**2 - p(4)**2
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k(1) = dreal(fo(5)) + p(1)
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k(2) = dreal(fo(6)) + p(2)
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k(3) = dimag(fo(6)) + p(3)
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k(4) = dimag(fo(5)) + p(4)
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T12 = ft(1,2) + ft(2,1)
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T13 = ft(1,3) + ft(3,1)
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T14 = ft(1,4) + ft(4,1)
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T23 = ft(2,3) + ft(3,2)
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T24 = ft(2,4) + ft(4,2)
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T34 = ft(3,4) + ft(4,3)
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if ( fmass.gt.rZero ) then
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d = - gt/dcmplx( p2-fmass**2, fmass*fwidth )
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d = - gt/dcmplx( p2, rZero )
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fto(1) =fmass*(fmass*fo(1)*r2**2*Tii
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& - fo(4)*r2*Tii*(k(2) + ci*k(3))
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& - fo(3)*r2*Tii*(k(1) + k(4))) +
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& fmass*(fo(4)*(T12*k(1) + ci*T13*k(1)
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&+ T23*(-(ci*k(2)) - k(3)) - T24*k(4) - ci*T34*k(4)) +
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& fo(3)*(-(T12*k(2)) - T24*k(2) - T13*k(3)
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& - T34*k(3) - T14*(-k(1) + k(4)))) +
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& (fmass*fo(4)*r2**2*Tii - fo(1)*r2*Tii*(-k(2)
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&+ ci*k(3)) - fo(2)*r2*Tii*(k(1) + k(4)))*(p(2) + ci*p(3)) +
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& (fo(1)*(-(T12*k(1)) + ci*T13*k(1)
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&+ T23*(-(ci*k(2)) + k(3)) + T24*k(4) - ci*T34*k(4)) +
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& fo(2)*(-(T12*k(2)) - T24*k(2) - T13*k(3)
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& - T34*k(3) - T14*(-k(1) + k(4))))*(p(2) + ci*p(3)) +
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& (fmass*fo(3)*r2**2*Tii - fo(2)*r2*Tii*(-k(2)
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&- ci*k(3)) - fo(1)*r2*Tii*(k(1) - k(4)))*(p(1) + p(4)) +
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& (fo(2)*(-(T12*k(1)) - ci*T13*k(1)
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&+ T23*(ci*k(2) + k(3)) + T24*k(4) + ci*T34*k(4)) +
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& fo(1)*(-(T12*k(2)) + T24*k(2)
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&- T13*k(3) + T34*k(3) - T14*(k(1) + k(4))))*(p(1) + p(4)) +
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& rtwo*(fmass*(fo(4)*(-(T22*k(2))
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&- ci*T33*k(3)) + fo(3)*(T11*k(1) - T44*k(4))) +
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& (fo(1)*(T22*k(2) - ci*T33*k(3))
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&+ fo(2)*(T11*k(1) - T44*k(4)))*(p(2) + ci*p(3)) +
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& (fo(2)*(T22*k(2) + ci*T33*k(3))
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& + fo(1)*(T11*k(1) + T44*k(4)))*(p(1) + p(4)))
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fto(2) = fmass*(fmass*fo(2)*r2**2*Tii
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& - fo(3)*r2*Tii*(k(2) - ci*k(3))
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& - fo(4)*r2*Tii*(k(1) - k(4))) +
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& fmass*(fo(3)*(T12*k(1) - ci*T13*k(1)
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& + T23*(ci*k(2) - k(3)) - T24*k(4) + ci*T34*k(4)) +
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& fo(4)*(-(T12*k(2)) + T24*k(2)
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&- T13*k(3) + T34*k(3) - T14*(k(1) + k(4)))) +
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& (fmass*fo(3)*r2**2*Tii - fo(2)*r2*Tii*(-k(2)
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&- ci*k(3)) - fo(1)*r2*Tii*(k(1) - k(4)))*(p(2) - ci*p(3)) +
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& (fo(2)*(-(T12*k(1)) - ci*T13*k(1)
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&+ T23*(ci*k(2) + k(3)) + T24*k(4) + ci*T34*k(4)) +
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& fo(1)*(-(T12*k(2)) + T24*k(2) - T13*k(3)
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& + T34*k(3) - T14*(k(1) + k(4))))*(p(2) - ci*p(3)) +
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& rtwo*(fmass*(fo(3)*(-(T22*k(2)) + ci*T33*k(3))
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&+ fo(4)*(T11*k(1) + T44*k(4))) +
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& (fo(2)*(T22*k(2) + ci*T33*k(3))
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&+ fo(1)*(T11*k(1) + T44*k(4)))*(p(2) - ci*p(3)) +
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& (fo(1)*(T22*k(2) - ci*T33*k(3))
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&+ fo(2)*(T11*k(1) - T44*k(4)))*(p(1) - p(4))) +
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& (fmass*fo(4)*r2**2*Tii - fo(1)*r2*Tii*(-k(2)
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&+ ci*k(3)) - fo(2)*r2*Tii*(k(1) + k(4)))*(p(1) - p(4)) +
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& (fo(1)*(-(T12*k(1)) + ci*T13*k(1)
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&+ T23*(-(ci*k(2)) + k(3)) + T24*k(4) - ci*T34*k(4)) +
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& fo(2)*(-(T12*k(2)) - T24*k(2) - T13*k(3)
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& - T34*k(3) - T14*(-k(1) + k(4))))*(p(1) - p(4))
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fto(3) = fmass*(fmass*fo(3)*r2**2*Tii
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& - fo(2)*r2*Tii*(-k(2) - ci*k(3))
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&- fo(1)*r2*Tii*(k(1) - k(4))) +
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& fmass*(fo(2)*(-(T12*k(1)) - ci*T13*k(1)
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&+ T23*(ci*k(2) + k(3)) + T24*k(4) + ci*T34*k(4)) +
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& fo(1)*(-(T12*k(2)) + T24*k(2) - T13*k(3)
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& + T34*k(3) - T14*(k(1) + k(4)))) +
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& (fmass*fo(2)*r2**2*Tii - fo(3)*r2*Tii*(k(2)
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&- ci*k(3)) - fo(4)*r2*Tii*(k(1) - k(4)))*(-p(2) - ci*p(3)) +
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& (fo(3)*(T12*k(1) - ci*T13*k(1) + T23*(ci*k(2)
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& - k(3)) - T24*k(4) + ci*T34*k(4)) +
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& fo(4)*(-(T12*k(2)) + T24*k(2) - T13*k(3)
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&+ T34*k(3) - T14*(k(1) + k(4))))*(-p(2) - ci*p(3)) +
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& rtwo*(fmass*(fo(2)*(T22*k(2) + ci*T33*k(3))
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&+ fo(1)*(T11*k(1) + T44*k(4))) +
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& (fo(3)*(-(T22*k(2)) + ci*T33*k(3))
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&+ fo(4)*(T11*k(1) + T44*k(4)))*(-p(2) - ci*p(3)) +
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& (fo(4)*(-(T22*k(2)) - ci*T33*k(3))
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& + fo(3)*(T11*k(1) - T44*k(4)))*(p(1) - p(4))) +
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& (fmass*fo(1)*r2**2*Tii - fo(4)*r2*Tii*(k(2)
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&+ ci*k(3)) - fo(3)*r2*Tii*(k(1) + k(4)))*(p(1) - p(4)) +
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& (fo(4)*(T12*k(1) + ci*T13*k(1) +
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& T23*(-(ci*k(2)) - k(3)) - T24*k(4) - ci*T34*k(4)) +
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& fo(3)*(-(T12*k(2)) - T24*k(2) - T13*k(3)
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&- T34*k(3) - T14*(-k(1) + k(4))))*(p(1) - p(4))
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fto(4) =fmass*(fmass*fo(4)*r2**2*Tii
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& - fo(1)*r2*Tii*(-k(2) + ci*k(3))
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& - fo(2)*r2*Tii*(k(1) + k(4))) +
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& fmass*(fo(1)*(-(T12*k(1)) + ci*T13*k(1)
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&+ T23*(-(ci*k(2)) + k(3)) + T24*k(4) - ci*T34*k(4)) +
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& fo(2)*(-(T12*k(2)) - T24*k(2) - T13*k(3)
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&- T34*k(3) - T14*(-k(1) + k(4)))) +
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& (fmass*fo(1)*r2**2*Tii - fo(4)*r2*Tii*(k(2)
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&+ ci*k(3)) - fo(3)*r2*Tii*(k(1) + k(4)))*(-p(2) + ci*p(3)) +
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& (fo(4)*(T12*k(1) + ci*T13*k(1)
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&+ T23*(-(ci*k(2)) - k(3)) - T24*k(4) - ci*T34*k(4)) +
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& fo(3)*(-(T12*k(2)) - T24*k(2) - T13*k(3)
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& - T34*k(3) - T14*(-k(1) + k(4))))*(-p(2) + ci*p(3)) +
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& (fmass*fo(2)*r2**2*Tii - fo(3)*r2*Tii*(k(2)
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&- ci*k(3)) - fo(4)*r2*Tii*(k(1) - k(4)))*(p(1) + p(4)) +
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& (fo(3)*(T12*k(1) - ci*T13*k(1) + T23*(ci*k(2)
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& - k(3)) - T24*k(4) + ci*T34*k(4)) +
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& fo(4)*(-(T12*k(2)) + T24*k(2) - T13*k(3)
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&+ T34*k(3) - T14*(k(1) + k(4))))*(p(1) + p(4)) +
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& rtwo*(fmass*(fo(1)*(T22*k(2) - ci*T33*k(3))
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&+ fo(2)*(T11*k(1) - T44*k(4))) +
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& (fo(4)*(-(T22*k(2)) - ci*T33*k(3))
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& + fo(3)*(T11*k(1) - T44*k(4)))*(-p(2) + ci*p(3)) +
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& (fo(3)*(-(T22*k(2)) + ci*T33*k(3))
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& + fo(4)*(T11*k(1) + T44*k(4)))*(p(1) + p(4)))