High statistic study of the K- -> pi0 mu- nu decay

Details High statistic study of the K- -> pi0 mu- nu decay High statistic study of the K- -> pi0 mu- nu decay

2003-11-30

arxiv.org/abs/hep-ex/0312004v1

Phys.Lett.B581:31-38,2004

Physics

High Energy Physics

High Energy Physics - Experiment

11 pages, 8 EPS figures, accepted by Physics Letters B

Scientific paper

10.1016/j.physletb.2003.12.002

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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