FRIED-YENNIE GAUGE IN DIMENSIONALLY REGULARIZED QED

The Fried-Yennie gauge in QED is a covariant gauge with agreeable infr ared properties. That is, the mass-shell renormalization scheme can be implemented without introducing artificial infrared divergences, and terms having spuriously low orders in a disappear in certain bound-sta te calculations. The photon propagator in the Fried-Yennie gauge has t he form D(beta)munu)(k) = (-1/k2)[g(munu) + betak(mu)k(nu)/k2], where beta is the gauge parameter. In this work, I show that the Fried-Yenni e gauge parameter is beta = 2/(1 - 2 epsilon) when dimensional regular ization (with n = 4 - 2epsilon dimensions of spacetime) is used to reg ulate the theory.