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

Phys.Lett.B589:111-117,2004 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: lamb...

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Hauptverfasser:	Yushchenko, O. P, Akimenko, S. A, Britvich, G. I, Datsko, K. V, Filin, A. P, Inyakin, A. V, Konstantinov, A. S, Konstantinov, V. F, Korolkov, I. Y, Khmelnikov, V. A, Leontiev, V. M, Novikov, V. P, Obraztsov, V. F, Polyakov, V. A, Romanovsky, V. I, Ronjin, V. M, Shelikhov, V. I, Smirnov, N. E, Tchikilev, O. G, Uvarov, V. A, Bolotov, V. N, Laptev, S. V, Polyarush, A. Yu
Format:	Artikel
Sprache:	eng
Schlagworte:	Physics - High Energy Physics - Experiment
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Zusammenfassung:	Phys.Lett.B589:111-117,2004 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: f_{T}/f_{+}(0)=-0.012 +- 0.021(stat) +- 0.011$(syst), f_{S}/f_{+}(0)=-0.0037^{+0.0066}_{-0.0056}(stat) +- 0.0041(syst).
DOI:	10.48550/arxiv.hep-ex/0404030