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IHEP 2013 - 7 (In English) | |
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V.A.Uvarov, S.A.Akimenko, G.I.Britvich, A.P.Filin, A.V.Inyakin,
S.A.Kholodenko, A.S.Konstantinov, V.F.Konstantinov, V.M.Leontiev,
V.F.Obraztsov, V.A.Polyakov, A.V.Popov, V.I.Romanovsky, O.V.Stenyakin,
O.G.Chikilev, O.P.Yushchenko
(IHEP, Protvino, Russia),
V.N.Bolotov, V.A.Duk, A.A.Khudyakov, A.I.Makarov, A.Yu.Polyarush
(INR RAS, Moscow, Russia)
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Measurement of charged kaon semileptonic decay branching fraction
\boldmath{$K^- \to e^- \bar{\nu}_e \pi^0$} using ISTRA+ detector |
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| Protvino, 2013. – p. 15, figs. 6, tables 1, refs.: 13. | ||
The ratio of branching fractions for \mbox{$K^- \to e^- \bar{\nu}_e \pi^0$} and \mbox{$K^- \to \pi^- \pi^0$} decays has been measured using the ISTRA+ spectrometer. The result of our measurement is the following: $$\mathcal{R}_{K_{e3}/K_{2\pi}} = 0.2423 \pm 0.0015\,\mbox{\rm (stat)} \pm 0.0037\,\mbox{\rm (syst)}.$$ Using the current PDG value for the $K_{2\pi}$ branching fraction, this result leads to the measured $K_{e3}$ branching fraction of $Br(K_{e3}) = 0.0501 \pm 0.0009$ and to the value of $|V_{us}|\,f_+(0) = 0.2115 \pm 0.0021$.
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