dimensional integrals and their subsequent numerical evaluation by the IBM 7094, are given in a separate note by D. Loebbaka (to be published).~There is no obvious low-mass intermediate state leading to pure S-wave decay in this case.~S. Okubo and B. Sakita, Phys.Rev. Letters 11, 50 (1963).This estimate is lower (by about a factor of 5) than other estimates based on, for example, an estimate of the g 3~rate via@ 7r -37t.This is because, to have an isoscalar interaction leading to e -4', one must have at least one cross product (7t ~fr) of two identical vectors, which is zero unless there is a derivative on one of them.
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Huntington et al. (1965) studied this question.