High statistics study of the K- -> pi0 e- nu decay
I.V. Ajinenko, 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
TL;DR
This study provides a high-statistics measurement of the K- -> pi0 e- nu decay, determining the vector form-factor parameter and setting limits on tensor and scalar couplings, using the ISTRA+ spectrometer at U-70.
Contribution
It offers the most precise measurement of the lambda+ parameter and new limits on tensor and scalar couplings in this decay channel.
Findings
Measured lambda+ = 0.0286 +- 0.0010
Limits on tensor coupling: f(T)/f+(0)=0.021 +0.064 -0.075
Limits on scalar coupling: f(S)/f+(0)=0.002 +0.020 -0.022
Abstract
The decay K- -> pi0 e- nu has been studied using in-flight decays detected with the "ISTRA+" spectrometer working at the 25 GeV negative secondary beam of the U-70 PS. About 550K events were used for the analysis. The lambda+ parameter of the vector form-factor has been measured: lambda+ = 0.0286 +- 0.0008 (stat) +- 0.0006(syst). The limits on the possible tensor and scalar couplings have been obtained: f(T)/f+(0)=0.021 +0.064 -0.075 (stat) +- 0.026(syst) ; f(S)/f+(0)=0.002 +0.020 -0.022 (stat) +- 0.003(syst)
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