I want to understand the 'vertex factor' of 3-bosons field and 4-bosons field but get confused.(adsbygoogle = window.adsbygoogle || []).push({});

(I know the lagrangian and have computed the interaction vertices already) only need to understand the vertex factor.

In other words, I want to learn how 3-boson vertex and 4-boson vertex are computed in Feynman diagrams.

It is, for example, given in Peskin&Schrioeder on page 507 but I dont get it as to what is permuted there, the color indices a,b,c or the lorentz indices and the momentum?

any help/hint is much appricaited !

Thanks.

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# Non-abelian gauge fields 3-vertex and 4-vertex?

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