Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2003-11-30
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.
Akimenko S. A.
Belous K. S.
Bolotov V. N.
Britvich G. I.
Datsko K. V.
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