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Measurement of charged kaon semileptonic decay branching fraction K^ - \to e^ - \bar \nu _e \pi ^0 using ISTRA+ detector |
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| Authors: | V A Uvarov S A Akimenko V N Bolotov G I Britvich V A Duk A P Filin A V Inyakin S A Kholodenko A A Khudyakov A S Konstantinov V F Konstantinov V M Leontiev A I Makarov V F Obraztsov V A Polyakov A Yu Polyarush A V Popov V I Romanovsky O V Stenyakin O G Tchikilev O P Yushchenko |
| Institution: | 1. Institute for High Energy Physics, Protvino, Russia 2. Institute for Nuclear Research, Moscow, Russia |
| Abstract: | The ratio of branching fractions for \(K^ - \to e^ - \bar \nu _e \pi ^0\) andK ? → π?π0 decays has been measured using the ISTRA+ spectrometer. The result of our measurement is the following: $$\mathcal{R}_{Ke_3 /K_{2\pi } } = 0.2423 \pm 0.0015(stat.) \pm 0.0037(syst.).$$ Using the current PDG value for the K 2π branching fraction, this result leads to the measured K e3 branching fraction of Br(K e3) = 0.0501 ± 0.0009 and to the value of |V us |f +(0) = 0.2115 ± 0.0021. |
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