Study of the K- -> mu- nu pi0 decay

Details Study of the K- -> mu- nu pi0 decay Study of the K- -> mu- nu pi0 decay

2002-02-07

arxiv.org/abs/hep-ph/0202061v1

Phys.Atom.Nucl.66:105-109,2003; Yad.Fiz.66:107-111,2003

Physics

High Energy Physics

High Energy Physics - Phenomenology

9 pages, Latex, 5 Postscript figures

Scientific paper

10.1134/1.1540663

The decay $K^{-} \to \mu^{-} \bar{\nu} \pi^{0}$ has been studied using in-flight decays detected with ``ISTRA+'' setup operating in the 25 GeV negative secondary beam of the U-70 PS. About 112K events were used for the analysis. The $\lambda_{+}$ and $\lambda_{0}$ slope parameters of the decay formfactors $f_{+}(t)$, $f_{0}(t)$ have been measured : $\lambda_{+}= 0.0321 \pm 0.004$(stat) $\pm 0.002$(syst) $\lambda_{0}= 0.0209 \pm 0.004$(stat) $\pm 0.002$(syst); the correlation $d \lambda_{0}/d \lambda_{+}=-0.46$ The limits on the possible tensor and scalar couplings have been derived: $f_{T}/f_{+}(0)=-0.021 \pm 0.028$(stat) $\pm 0.014$(theory); $f_{S}/f_{+}(0)=0.004 \pm 0.005$(stat) $\pm 0.005$(theory)

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