Question on the Gell-Mann Low Equation.
In this paper, http://arxiv.org/abs/1205.3365, page 21, the author argues that if:
t →∞(1-iϵ), all the terms in equation (193) goes to zero, except the first term.
Can anyone explain this to me?
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
3 years ago