IHEP 2002 - 6
	I.V.Ajinenko, S.A.Akimenko, G.I.Britvich, I.G.Britvich, K.V.Datsko, A.P.Filin, A.V.Inyakin, A.S.Konstantinov, V.F.Konstantinov, I.Ya.Korol'kov, V.M.Leont'ev, V.P.Novikov, V.F.Obraztsov, V.A.Polyakov, V.I.Romanovsky, V.I.Shelikhov, N.E.Smirnov, M.M.Soldatov, O.G.Tchikilev, E.Usenko, M.V.Vasil'ev, E.V.Vlasov, V.I.Yakimchuk, O.P.Yushchenko (Institute for High Energy Physics, Protvino, Russia) V.N.Bolotov, S.V.Laptev, V.A.Lebedev, A.R.Pastsjak, A.Yu.Polyarush, R.Kh.Sirodeev (Institute for Nuclear Research, Moscow, Russia)
	Study of the $K^{-} \rightarrow \mu^{-} \nu \pi^{0}$ Decay
	Protvino, 2002.- p.7, figs. 5, table 2, refs.:13.

The decay $K^{-} \rightarrow \mu^{-} \nu \pi^{0} $ has been studied using in-flight decays detected with ``ISTRA+" setup operating in the 25 GeV negative secondary beam of the U-70 PS. About 112K events were used for the analysis. The $\lambda_{+}$ and $\lambda_{0}$ slope parameters of the decay formfactors $f_{+}(t)$, $f_{0}(t)$ have been measured:

• $\lambda_{+}= 0.0321 \pm 0.004$(stat) $\pm 0.002$(syst);
• $\lambda_{0}= 0.0209 \pm 0.004$(stat) $\pm 0.002$(syst); the correlation $d \lambda_{0}/d \lambda_{+}=-0.46.$

The limits on the possible tensor and scalar couplings have been derived:
• $f_{T}/f_{+}(0)=-0.021 \pm 0.028$(stat) $\pm 0.014$(theory);
• $f_{S}/f_{+}(0)=0.004 \pm 0.005$(stat) $\pm 0.005$(theory).

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