Srednicki — Quantum Field Theory · Problem 16.1

Canonical Quantization of Scalar Fields — Mark Srednicki

Physics — QFT · phi4-vertex-correction

Problem

Compute the

O(\lambda^2)

correction to

\mathbf{V}_4

\varphi^4

theory (see problem 9.2) in

d = 4 - \varepsilon

spacetime dimensions. Take

\mathbf{V}_4 = \lambda

when all four external momenta are on shell, and

s = 4m^2

. What is the

O(\lambda)

contribution to

C