High statistics study of the K-→+π0μ-ν decay

The decay K- --> pi(0)mu(-)nu has been studied using in-flight decays detected with the STRA+ spectrometer. About 540K events were collected for the analysis. The lambda(+) and lambda(0) slope parameters of the decay form-factors f(+)(t), f(0)(t) have been measured: lambda(+) = 0.0277 +/- 0.0013(stat) +/- 0.0009(syst), lambda(0) = 0.0183 +/- 0.0011(stat) +/- 0.0006(syst), and dlambda(0)/dlambda(+) = -0.348. The limits on the possible tensor and scalar couplings have been derived: f(T)/f(+)(0) = -0.0007 +/- 0.0071, f(S)/f(+)(0) = 0.0017 +/- 0.0014. No visible non-linearity in the form-factors have been observed. (C) 2003 Elsevier B.V. All rights reserved.