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subroutine ftixkk(fi,tc,g,fmass,fwidth , fti)
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c This subroutine computes an off-shell fermion wavefunction from a
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c flowing-IN external fermion and a KK tensor boson.
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c complex fi(6) : flow-in fermion |fi>
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c complex tc(6,4) : input tensor t
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c real g : coupling constant gtf
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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 fti(6) : off-shell fermion |f',t,fi>
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double complex fi(6), tc(6,4), fti(6), d
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double complex k14p, k14m, k23, k23s, p14p, p14m
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double complex D1, D2, D3, D4, Tii, mTii
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double complex T11, T22, T33, T44, T12, T13, T14, T23, T24, T34
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double precision g, fmass, fwidth, pf(4), k(4), pf2, m2
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double precision rZero, rTwo
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parameter( rZero = 0.0d0, rTwo = 2.0d0 )
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parameter( ci = ( 0.0d0, 1.0d0 ) )
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fti(5) = fi(5) - tc(5,1)
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fti(6) = fi(6) - tc(6,1)
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pf2 = pf(1)**2 - pf(2)**2 - pf(3)**2 - pf(4)**2
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k(1) = dreal(fi(5)) + pf(1)
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k(2) = dreal(fi(6)) + pf(2)
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k(3) = dimag(fi(6)) + pf(3)
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k(4) = dimag(fi(5)) + pf(4)
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k14p = dcmplx( k(1)+k(4), rZero )
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k14m = dcmplx( k(1)-k(4), rZero )
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k23 = dcmplx( k(2), k(3) )
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p14p = dcmplx( pf(1)+pf(4), rZero )
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p14m = dcmplx( pf(1)-pf(4), rZero )
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T12 = tc(1,2) + tc(2,1)
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T13 = tc(1,3) + tc(3,1)
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T14 = tc(1,4) + tc(4,1)
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T23 = tc(2,3) + tc(3,2)
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T24 = tc(2,4) + tc(4,2)
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T34 = tc(3,4) + tc(4,3)
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D1 = k(1)*(T11-T14) - k(2)*(T12-T24)
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& - k(3)*(T13-T34) - k(4)*(T14-T44)
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D2 = - k(1)*(T12-ci*T13) + k(2)*(T22-ci*T23)
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& + k(3)*(T23-ci*T33) + k(4)*(T24-ci*T34)
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D3 = - k(1)*(T12+ci*T13) + k(2)*(T22+ci*T23)
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& + k(3)*(T23+ci*T33) + k(4)*(T24+ci*T34)
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D4 = k(1)*(T11+T14) - k(2)*(T12+T24)
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& - k(3)*(T13+T34) - k(4)*(T14+T44)
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Tii = 16.d0*(T11 - T22 - T33 - T44)
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if ( fmass.gt.rZero ) then
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d = - g/dcmplx( pf2-fmass**2, fmass*fwidth )
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d = - g/dcmplx( pf2, rZero )
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fti(1) = fi(1)*(p14m*D4 + dconjg(fti(6))*D3)
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& - fi(2)*(p14m*D2 + dconjg(fti(6))*D1)
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& + Tii*( fi(1)*(dconjg(fti(6))*k23 - p14m*k14p)
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& + fi(2)*(dconjg(fti(6))*k14m - p14m*k23s) )
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fti(2) = - fi(1)*(fti(6)*D4 + p14p*D3)
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& + fi(2)*(fti(6)*D2 + p14p*D1)
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& + Tii*( fi(1)*(fti(6)*k14p - p14p*k23 )
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& + fi(2)*(fti(6)*k23s - p14p*k14m) )
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fti(3) = fi(3)*(p14p*D1 + dconjg(fti(6))*D3)
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& + fi(4)*(p14p*D2 + dconjg(fti(6))*D4)
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& + Tii*( fi(3)*(dconjg(fti(6))*k23 - p14p*k14m)
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& - fi(4)*(dconjg(fti(6))*k14p - p14p*k23s) )
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fti(4) = fi(3)*(fti(6)*D1 + p14m*D3)
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& + fi(4)*(fti(6)*D2 + p14m*D4)
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& + Tii*( fi(3)*(p14m*k23 - fti(6)*k14m)
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& - fi(4)*(p14m*k14p - fti(6)*k23s) )
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if ( fmass.gt.rZero ) then
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fti(1) = fti(1) + fmass*( D1*fi(3) + D2*fi(4) )
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fti(2) = fti(2) + fmass*( D3*fi(3) + D4*fi(4) )
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fti(3) = fti(3) + fmass*( D4*fi(1) - D2*fi(2) )
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fti(4) = fti(4) + fmass*(-D3*fi(1) + D1*fi(2) )
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fti(i) = fti(i) + mTii*m2*fi(i)
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fti(1) = fti(1) + mTii*( fi(3)*(rTwo*p14m - k14m)
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& + fi(4)*(k23 - rTwo*dconjg(fti(6))) )
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fti(2) = fti(2) + mTii*( fi(3)*(k23 - rTwo*fti(6))
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& + fi(4)*(rTwo*p14p - k14p) )
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fti(3) = fti(3) + mTii*( fi(1)*(rTwo*p14p - k14p)
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& + fi(2)*(rTwo*dconjg(fti(6)) - k23s) )
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fti(4) = fti(4) + mTii*( fi(1)*(rTwo*fti(6) - k23)
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& + fi(2)*(rTwo*p14m - k14m) )