Measurement of Kμ3+ Decay Parameters

K⁺ mesons stopped in C₃F₈ in the Lawrence Radiation Laboratory (LRL) 30-inch heavy liquid bubble chamber were used in a study of the properties of the decay mode K⁺-->π⁰+μ⁺+ν. The properties studied were the μ⁺ and π⁰ energy spectra, μ⁺ longitudinal polarization, μ⁺ total polarization, and Kμ3+Ke3+ branching ratio. The data are consistent with the universal V-A theory, with time-reversal invariance, and μ-e universality. Using the usual form-factor phenomenological expression for the strangeness-changing vector current, we obtain: Re ξ=+0.34-0.26+0.42, Im ξ=+0.69- 1.0+0.85, λ₊=0.00+/-0.05, f₊(K_μ3)f₊(K_e3)=1.01+/-0.05. Im ξ should vanish by time-reversal invariance and f₊(K_μ3)f₊(K_e3) should be unity if μ-e universality holds. With these assumptions we obtain Re ξ=0.41-0.22+0.27.