Even Quantum Electrodynamics from which Richard Feynman gained his notoriety, has been pilloried by the aforementioned P.A.M. Dirac, who stated "I might have thought that the new ideas were correct if they had not been so ugly."

This symmetry focuses on changing the charge of a given particle to its opposite, and thus changing the particle into its mirror image- however, this results in a change inside of the Weak Force, and it no longer obeys symmetry. QED can't violate this symmetry, whereas the Strong Force can, but doesn't for some unknown reason.

Quantum Electrodynamics

The area of physics in question is Quantum Electrodynamics, or the theory of light and matter, specifically the way light (photons) interact, and the nature of electrons.