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High statistic measurement of the K- -> pi0 e- nu decay form-factors

O. P. Yushchenko, S. A. Akimenko, G. I. 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. Yu. Polyarush

hep-exarXiv:hep-ex/0404030

Abstract

The decay K- -> pi0 e- nu is studied using in-flight decays detected with the ISTRA+ spectrometer. About 920K events are collected for the analysis. The lambda+ slope parameter of the decay form-factor f+(t) in the linear approximation (average slope) is measured: lambda+(lin)= 0.02774 +- 0.00047(stat) +- 0.00032(syst). The quadratic contribution to the form-factor was estimated to be lambda'+ = 0.00084 +- 0.00027(stat) +- 0.00031(syst). The linear slope, which has a meaning of df+(t)/dt|t=0 for this fit, is lambda+ = 0.02324 +- 0.00152(stat) +- 0.00032(syst). The limits on possible tensor and scalar couplings are derived: fT/f+(0)=-0.012 +- 0.021(stat) +- 0.011$(syst), fS/f+(0)=-0.0037+0.0066-0.0056(stat) +- 0.0041(syst).

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