3
$\begingroup$

In this article, in e.g. figure 2, what does these dashed lines across the Feynman diagram mean?

$\endgroup$
2
$\begingroup$

Have a look here, and here. cutting is essentially a shortcut for calculating complicated diagrams.

$\endgroup$
2
$\begingroup$

For me, the most clear reference on the optical theorem and on Cutting rules is chapter 7.3 of Peskin & Schroeder.

$\endgroup$

Your Answer

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

Not the answer you're looking for? Browse other questions tagged or ask your own question.