Name: D.Y.Chen Date: 01/22/10-01:48:41 PM Z
Hi,
I have a problem in my calculations for a triangle diagram. One term in
the amplitude is
Amp=FV[q,\[Mu]].FV[q,\[Nu]].FV[q,\[Alpha]].FV[q,\[Beta]]*
FAD[{p3+q,m1},{p4-q,m2},{q,mD}].FAD[{q,Lambda}]^2
All these four Lorentz index are contract with polarization tensor and
polarization vector.
_________ p3
/|
p0 m1 / |
_______/ | q
\ |
m2 \ |
\|________ p4
I hope the above figure is clear for you. The initial particle is spin-2 state while the final states are two spin-1 particles. The part FAD[{q,Lambda}] is introduced by the form factors or some else.
I do not know how to deal with this term and hope someone can give me some useful suggestions!
Best Wishes!
D. Y. Chen