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It has been remarked byLee andYang [Phys. Rev.,108, 1611 (1957)] that such a coupling is required if the Michel parameter is less than the value of 3/4 predicted by the direct coupling of two component neutrinos. The present experimental data [M. M. Block, E. Fiorini, C. Kikuchi, G. Giacomelli andS. Ratti:Proc. of 1960High Energy Physics Conf. (1960), p. 553] does not show any discrepancy within experimental errors.
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Matthews, P.T., Salam, A. Resonance effects in intermediate boson theory. Nuovo Cim 19, 837–839 (1961). https://doi.org/10.1007/BF02733383
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DOI: https://doi.org/10.1007/BF02733383