Kl3γ0 decays: Branching ratios and T-odd momenta correlations

The branching ratios of the K0→π-l+νlγ (l=e, μ) decays, and the T-odd triple momenta correlations ξ=q-vector·[p-vectorlxp-vectorπ]/MK3, due to the electromagnetic final state interaction, in these processes are calculated. The contributions on the order of ω-1 and ω0 to the corresponding amplitudes are treated exactly. For the branching ratios and T-odd correlation in K0→π-e+νeγ decay, the corrections on the order of ω are estimated and demonstrated to be small. The results for the branching ratios are in good agreement with the previous ones. The T-odd triple momenta correlations in Kl3γ0 decays are calculated for the first time. The values of the ξ-odd asymmetry are on the order of 10-3 and 10-2 in the K0→π-μ+νμγ and K0→π-e+νeγ decays, respectively.