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
TL;DR
This high-statistics study of the K- -> pi0 mu- nu decay precisely measured decay form-factor slopes and set limits on tensor and scalar couplings, with no evidence of non-linearity in form-factors.
Contribution
The paper provides the most precise measurements of the decay form-factor slopes and limits on non-standard couplings for the K- -> pi0 mu- nu decay.
Findings
Measured lambda+ = 0.0277+-0.0013 (stat)+-0.0009 (syst)
Measured lambda0 = 0.0183+-0.0011 (stat)+-0.0006 (syst)
Set limits on tensor and scalar couplings
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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Taxonomy
TopicsParticle physics theoretical and experimental studies · Quantum Chromodynamics and Particle Interactions · Nuclear physics research studies