V-A theory and the decay of the Λ hyperon

Okubo, S. ; Marshak, R. E. ; Sudarshan, E. C. G. (1959) V-A theory and the decay of the Λ hyperon Physical Review, 113 (3). pp. 944-954. ISSN 0031-899X

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Official URL: http://prola.aps.org/abstract/PR/v113/i3/p944_1

Related URL: http://dx.doi.org/10.1103/PhysRev.113.944


The decay of the Λ hyperon is studied within the framework of the chirality-invariant four-fermion interaction. It is shown that the branching ratio of the charged and neutral modes, the s- to p-wave emission, as well as the sign and magnitude of the asymmetry parameter of the p+π decay mode, can be understood on the basis of the V-A theory. Improvements upon the Born approximation, using dispersion theory, indicate that these conclusions are not invalidated by taking into account the pion-nucleon interaction.

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