Student Friendly Introduction to QFT · Problem 12.6
Renormalization: Putting It All Together
Physics — QFT · qed-running-coupling-constant
Problem
Use (12-37) to calculate the QED coupling constant at 5.5 MeV. Assume the up quark mass is exactly 3 MeV and the down quark mass is exactly 6 MeV. Use 1/137 for α(μ=2me).