IHEP 2003 - 18
	I.V.Ajinenko, S.A.Akimenko, K.S.Belous, G.I.Britvich, I.G.Britvich, K.V.Datsko, A.P.Filin, A.V.Inyakin, A.S.Konstantinov, V.F.Konstantinov, I.Y.Korolkov, V.A.Khmelnikov, V.M.Leontiev, V.P.Novikov, V.F.Obraztsov, V.A.Polyakov, V.I.Romanovsky, V.M.Ronjin, V.I.Shelikhov, N.E.Smirnov, A.A.Sokolov, O.G.Tchikilev, V.A.Uvarov, O.P.Yushchenko (Institute for High Energy Physics, Protvino, Russia) V.N.Bolotov, S.V.Laptev, A.R.Pastsjak, A.Yu.Polyarush, R.Kh.Sirodeev (Institute for Nuclear Research, Moscow, Russia)
	Study of the $K^{-} \rightarrow \pi^{0} e^{-} \nu $ decay
	Protvino, 2003.- p.8, figs. 7, table 1, refs.:13.

The decay $K^{-} \rightarrow \pi^{0}e^{-} \nu$ has been studied using in-flight decays detected with ISTRA+ setup working at the 25 GeV negative secondary beam of the U-70 PS. About 560K events were used for the analysis. The $\lambda_{+}$ parameter of the vector form-factor has been measured: $\lambda_{+}= 0.0286 \pm 0.0008 (stat) \pm 0.0006(syst)$. The limits on a possible tensor and scalar couplings have been derived:

• $|f_{T}|/f_{+}(0)=0.021^{+0.064}_{-0.075} (stat) \pm 0.026(syst) ;
• $|f_{S}|/f_{+}(0)=0.002^{+0.020}_{-0.022}(stat) \pm 0.003(syst)

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