Abstract
The decay K−→π0μ−ν has been studied using in-flight decays detected with the “STRA+” spectrometer. About 540K events were collected for the analysis. The λ+ and λ0 slope parameters of the decay form-factors f+(t), f0(t) have been measured: λ+=0.0277±0.0013(stat)±0.0009(syst), λ0=0.0183±0.0011(stat)±0.0006(syst), and dλ0/dλ+=−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.
Highlights
The decay K → μνπ0(Kμ3) provides unique information about the dynamics of the strong interactions
In our analysis we present new search for scalar (S) and tensor (T) interactions by fitting the Kμ3 Dalitz plot distribution, similar to the procedure used in the Ke3 decay studies[4]
The value λμ+ = 0.0277±0.0013 is in a good agreement with that extracted from the analysis of our Ke3 data [4]: λe+ = 0.0286 ± 0.00054(stat) ± 0.0006(syst)
Summary
The decay K → μνπ0(Kμ3) provides unique information about the dynamics of the strong interactions. It has been a testing ground for such theories as current algebra, PCAC, Chiral Perturbation Theory(ChPT). In this paper we present a high-statistics measurement (∼ 537K events) of the Dalitz plot density in this decay. The Kμ3 decay is known to be a key one in hunting for phenomena beyond the Standard Model (SM). Significant efforts have been invested into T-violation searches, by the measurements of the muon transverse polarization σT [2], as well as into searches for the non-SM contributions into the decay amplitude [3]
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