0
$\begingroup$

In QCD, the Feynman rules for the vertices are usually presented with all momenta pointing inward. For the total amplitude of a given process, does this also affect the signs of the momenta taken in the incoming and outgoing spinors/polarisation vectors? Or do I only need to be concerned with the vertices which depend explicitly on the momentum 4-vectors, like the 3-point gluon vertex?

Thank you very much!

$\endgroup$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Browse other questions tagged or ask your own question.