A possible mechanism for the Δ T=1/2 rule in nonleptonic decays of strange particles
Vainshtein A.I. , Zakharov V.I. , Shifman M.A.
It is shown that allowance for strong interactions introduces into the effective weak-interaction Hamiltonian new terms that contain both leftand right-helical particles. Estimates in the simple quark model show that the contribution of these terms to the amplitudes of the Κ—>2π and Κ—>3π decays can dominate and lead to the ΔΓ= 1/2 rule. In this case, there are no grounds for expecting an enhancement of nonleptonic decays of charmed particles over their leptonic decays.