Comparison of the vector- and axial-vector-meson exchange contributions to the decay rate of the short-lived neutral kaon into two photons.

Abstract

The contributions of the charged axial-vector mesons b(1235) and a/sub 1/(1270) as exchange particles in the decay mode K/sub S/..--> gamma gamma.. are compared with those of the vector mesons p(770), ..omega..(783), phi(1020), and psi(3097). The range of the rates of decay obtained for several choices of the cutoff mass falls within the limits of the value GAMMA(K/sub S/..-->..2..gamma..)GAMMA(K/sub S/..-->..all) = (2.4 +- 1.2) x 10/sup -6/ obtained recently by the NA31 experimental group at the CERN SPS