Abstract
A method of treating weak interaction processes involving composite particles is formulated on the basis of the theory of bound states of quantum field theory. The method is applied to the analysis of the decay . And it is shown that under a possible set of assumptions ξ-value of this decay must like between -1 and +1 irrespective of the structure of π and K-meson. Then the method is applied to the leptonic decays of hyperons and it is shown that if we take -baryon model for hyperons there is a possibility of understanding the smallness of the decay rates compared to the ones expected from the universal coupling theory.
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