hep-ex/0309019 

Authors: I.V. Ajinenko, et al.
"High statistics study of the K- -> pi0 e- nu decay"

        Abstract
The decay K- -> pi0 e- nu has been studied using in-flight decays detected 
with the "ISTRA+" spectrometer working at the 25 GeV negative secondary beam 
of the U-70 PS. About 550K events were used 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 +0.064 -0.075 (stat) +- 0.026(syst) 
f(S)/f+(0)=0.002 +0.020 -0.022 (stat) +- 0.003(syst)