Study Of The K- -> Pi(0)E(-)Nu Decay

The decay K- --> pi(0)ev has been studied using in-flight decays detected with the "ISTRA+" spectrometer operating in the 25-GeV negative secondary beam of the U-70 PS. About 550K events were collected for the analysis. The lambda(+) parameter of the vector form-factor has been measured: lambda(+) = 0.0286 +/- 0.0008(stat) 0.0006(syst). The limits on the possible tensor and scalar couplings have been obtained: f(T)/f(+)(0) = 0.021(-0.075)(+0.064)(stat) +/- 0.026(syst); f(S)/f(+)(0) = 0.002(-0.022)(+0.020)(stat) +/- 0.003(syst). (C) 2003 Published by Elsevier B.V.