1. High statistic measurement of the <f>K-→π0e-ν</f> decay form-factors
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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., and Uvarov, V.A.
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NUCLEAR reactions , *NUCLEAR counters , *APPROXIMATION theory , *CALCULUS of tensors - Abstract
The decay
K-→π0e-ν is studied using in-flight decays detected with the “ISTRA+” spectrometer. About 920K events are collected for the analysis. Theλ+ slope parameter of the decay form-factorf+(t) in the linear approximation (average slope) is measured:λ+lin=0.02774±0.00047(stat)±0.00032(syst) . The quadratic contribution to the form-factor was estimated to beλ′+=0.00084±0.00027(stat)±0.00031(syst) . The linear slope, which has a meaning ofdf+(t)/dt&z.sfnc;t=0 for this fit, isλ+=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) . [Copyright &y& Elsevier]- Published
- 2004
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