Center for Theoretical Physics of the Universe (CTPU)

On the Feynman Rules of Massive Gauge Theory in Physical Gauges

by Dr. Junmou Chen (KIAS)

Wednesday, 7 February 2018 from to (Asia/Seoul)
at CTPU Seminar Room
Fourth floor IBS Building, 55, Expo-ro, Yuseong-gu, Daejeon, Korea, 34126

For massive gauge theory in physical gauges, both gauge fields and goldstone fields posses the same pole masses. Different from R_\xi gauge, this allows the interpretation of longitudinal polarization vectors as interpolated by both gauge fields and goldstone fields. I treat gauge fields and goldstone fields uniformly as 5-component fields and rederive the Feynman rules -- including both propagators and vertices, which prove to be largely simplified and share similarities to massless gauge theory. We illustrate the results in the Higgs-Kibble model, with SU(2) gauge group and unbroken custodial symmetry between the goldstone modes. This treatment can bring simplifications to the  calculations of the Standard Model.