A Help with this Standard Model demonstration please

Andreaca
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I want to demonstrate that calculating the squared amplitude of the process quark antiquark in lepton antilepton where I consider the non-zero masses of the fermions, is equivalent to considering the zero masses but with infinite insertions of the vev. I am trying to do it, but the pieces I find that diverge do not have opposite signs. Could you help me?
 
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Might help if you show what you have so far. Also if you square the negative frequency amplitude what result do you get (positive or negative) ?
Then ask yourself the question on a probability amplitude such as provided by the Schrodinger equations
" is a negative probability valid ? "
 
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