Measurement of Decay Correlations inKμ3+Decays

Abstract

Wire spark planes and scintillation counters were used in an experiment designed to measure the correlations among the products of the decay of a stopped $K^{+}$ meson to a muon, neutrino, and pion. The results determined the value of the form-factor ratio as $\xi \mathrm{}\left(0\right)=-0.62\mathrm{}\pm 0.28$. The momentum dependence of the $f_{+}$ form factor was defined by our measured value of ${\lambda }_{+}=0.024\mathrm{}\pm 0.022$ (taking ${\lambda }_{-}=0\mathrm{}$.)