Rare ∆S=∆Q decays in chiral perturbation theory
Abstract
We calculate, to leading order in chiral perturbation theory, the amplitude for the secondorder weak decay K^{0}>π^{+}e^{}v. We find the ratio of the amplitudes A(K^{0}>π^{+}e^{}v)/A(K^{0}>π^{+}e^{}v) $̄7.0×10^{7}. We compare this to a recent calculation of the same decay performed using quark operators and vacuum insertion approximation arguments, and find that our result is almost a factor of four larger.
 Publication:

Physics Letters B
 Pub Date:
 March 1991
 DOI:
 10.1016/03702693(91)90685J
 Bibcode:
 1991PhLB..256..265L