References
R. P. Feynman andM. Gell-Mann:Phys. Rev.,109, 193 (1958).
This additional term was mentioned byA. Pais andS. B. Treiman:Phys. Rev.,105, 1616 (1957), but was not included in their calculation.S. Oneda:Nucl. Phys.,3, 835 (1957) also mentioned that such a term may exist. The latter calculation was for K+→π++ν+ν.
E.g.,J. D. Jackson: 1962Brandeis Lectures, vol.1 (New York, 1963) and references therein.
In the Feinberg-Pais [Phys. Rev.,131, 2724 (1963)] theory of weak interactions higher-order weak interactions may in some cases become significant.
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Williamson, W. A note on K13 decay. Nuovo Cim 35, 706–708 (1965). https://doi.org/10.1007/BF02735359
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DOI: https://doi.org/10.1007/BF02735359