Measurements of the K+→π0e+ν form factors

Abstract The q 2 dependence of the vector form factor has been investigated using 3.2 × 10 4 K + → π 0 e + ν decays. The usual linear parametrization. ƒ + (q 2 ) = ƒ(0)(1+λ + q 2 /m π 0 0 ) gives λ + = 0.0284±0.0027. An analysis of the Dalitz plot density distribution for K e3 + decays yields the values for the scalar and tensor couplings ƒ s and ƒ t , and their relative phase angle o st .