Kl3+decays involving finite neutrino mass and mass mixing

$K_{l3}^{+}$ decays with the inclusion of effects of finite neutrino mass and mass mixing have been investigated. Predictions have been obtained for (i) pion energy spectrum, (ii) decay probability, (iii) π-l (=e,μ) angular correlations, (iv) π-l energy correlations, (v) lepton energy spectrum, (vi) π-${\nu }_i$ (i=e,μ,τ) angular correlations, and (vii) π-${\nu }_i$ energy correlations. Finite-mass effects are substantial in all the parameters discussed, whereas the mixing effects are discernible only in π-${\nu }_i$ angular and energy correlations. The mass limits for the ${\nu }_3$ mass for hierarchical mixing are found to be 174.0±0.9 MeV and 120±2 MeV for electronic and muonic modes, respectively, with nearly identical values for Kobayashi-Maskawa mixing.