A spinorial perspective on massless photons
arXiv:hep-ph/0701013 · doi:10.1007/s10701-007-9191-z
Abstract
We exploit the fact that, in Minkowski space-time, gamma matrices are possibly more fundamental than the metric to describe how gauge invariance at perturbative level enforces a Lagrangian for spinor electrodynamics with massless photons. The term quadratic in the potential arises naturally in the gauge-fixed Lagrangian but has vanishing coefficient.
5 pages, Plain Tex