Elsevier

Nuclear Physics B

Volume 89, Issue 2, 21 April 1975, Pages 210-252
Nuclear Physics B

A study of the semi-leptonic decays of K+ mesons

https://doi.org/10.1016/0550-3213(75)90094-2Get rights and content

Abstract

The form factors of the semi-leptonic decays K+π0e+ν and K+π0μ+ν have been investigated using a sample of events detected in the CERN 1.1 m3 heavy liquid bubble chamber. Analyses have been carried out using methods independent of any assumption of the q2 dependence of the form factors in addition to the usual linear parametrizations. Consistent results have been obtained from separate studies of both Dalitz plot density distributions and the branching ratio. A parametrized global analysis of both decay modes gives the values ξ(0) = -1.3 ± 0.7 and ξ(4.4 Mπ2) = -0.45 ± 0.13, or λ0 = - 0.017 ± 0.011 both for a fitted value of λ+ = 0.025 ± 0.007.

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    Chercheur agréé à l'IISN, Belgique.

    ∗∗

    Erkend onderzoeker by het IIKW, België.

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