Srednicki — Quantum Field Theory · Problem 90.5

Canonical Quantization of Scalar Fields — Mark Srednicki

Physics — QFT · electroweak-interactions-of-hadrons

Problem

Use your results from problems 88.7 and 89.5 to show that the neutron decay rate is enhanced by a factor of

1 + \frac{2}{\pi}\alpha\ln(M_{\rm W}/m_p)

. How much of the 4\% discrepancy is accounted for by this effect?