K _(l3γ)~+ decays revisited: Branching ratios and T-ODD momenta correlations

摘要

We calculate the branching ratios of the K~+ → π~0l~+ν_(lγ) (l = e, μ) decays, and the T-odd triple momenta correlations ξ = q · [p_l × p_π]/M_K~3, due to the electromagnetic final-state interaction, in these processes. The contributions on the order of ω~(-1) and ω~0 to the corresponding amplitudes are treated exactly. For the branching ratios, the corrections on the order of ω are estimated and demonstrated to be small. We compare the results with those of other authors. In some cases our results differ considerably from the previous ones.