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Hi, I have one question for you...

to compute the matrix element for the process u d -> u d I want to use full SM, but I have one problem I'll give you the maths.

process with W:

<ud|(\bar{Ψ}_{u}Ψ_{d})(\bar{Ψ}_{d}Ψ_{u})|ud>

process with γ:

<ud|(\bar{Ψ}_{u}Ψ_{u})(\bar{Ψ}_{d}Ψ_{d})|ud>

Z and g are the same with γ (i don't write the propagators and the Lorentz parts for simplicity).

Is there a minus sign between W and the others??

I say yes .... but i am not sure.

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# Relative minus sign?

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