FootNotes]
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These estimates remain essentially unchanged even if one uses the new experimental data such as σ(ν+p→n+π++ν)/σ(ν+p→p+π++μ)⩽0.08±0.04. reported byD. C. Cundy, G. Myatt, F. A. Nezrick, J. B. M. Pattison, D. H. Perkins, C. A. Ramm, W. Venus andH. W. Wachsmuth:Phys. Lett.,31 B, 478 (1970).
This is also one of the cases that the leptonic current (4) generates anSU 2 algebra of “charges.”. SeeS. Y. Tsai:Progr. Theor. Phys.,44, 558 (1970).
M. Y. Han andY. Nambu:Phys. Rev.,139, B 1006 (1965);Y. Miyamoto:Progr. Theor. Phys. Suppl., Extra Number, 187 (1965);N. Cabibbo, L. Maiani andG. Preparata:Phys. Lett.,25 B, 132 (1967).
For details, seeS. Y. Tsai: NUP-A-71-13.
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Tsai, S.Y. Universal weak interactions involving heavy leptons. Lett. Nuovo Cimento 2, 949–952 (1971). https://doi.org/10.1007/BF02778161
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DOI: https://doi.org/10.1007/BF02778161