Status of Chiral-Scale Perturbation Theory

R. J. Crewther, Lewis C. Tunstall

Chiral-scale perturbation theory $\chi$PT${}_{\sigma }$ has been proposed as an alternative to chiral $SU(3{)}_L\times SU(3{)}_R$ perturbation theory which explains the $\Delta I=1/2$ rule for kaon dec…