High statistic study of the K- -> pi0 mu- nu decay
O. P. Yushchenko, 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, O. G. Tchikilev, V. A. Uvarov, V. N. Bolotov, S. V. Laptev, A. R. Pastsjak, A. Yu. Polyarush
Abstract
The decay K- -> pi0 mu- nu has been studied using in-flight decays detected with the "ISTRA+" spectrometer. About 540K events were collected for the analysis. The lambda+ and lambda0 slope parameters of the decay form-factors f+(t), f0(t) have been measured : lambda+ = 0.0277+-0.0013 (stat)+-0.0009 (syst), lambda0 = 0.0183+-0.0011(stat)+-0.0006(syst), and d(lambda0)/d(lambda+)=-0.348. The limits on the possible tensor and scalar couplings have been derived: fT/f+(0)=-0.0007 +- 0.0071, fS/f+(0)=0.0017 +- 0.0014. No visible non-linearity in the form-factors have been observed.
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