Ponente
Prof.
Vladimir Obraztsov
(Institute for High Energy Physics, Protvino, Russian Federation)
Descripción
The decay K+ --> pi0 e+ nu (Ke3) is studied using in-flight decays detected with the "OKA" setup, working in the RF-separated secondary K+ beam of the U-70 synchrotron. About 10M events are available for the analysis. Preliminary results for the parameters of the f+(t) form-factor are presented. For the linear fit: \lambda_{+}=(2.984 \pm 0.04) \times 10^{-2}; for the quadratic fit: \lambda'_{+}= (2.499 \pm 0.13)\times 10^{-2} \lambda''_{+}=(0.193 \pm 0.048)\times 10^{-2}
For the Pole parametrization we get: Mv = 0.889 \pm 0.005 (GeV)
For the Dispersive parametrisation: Lambda_{+}=(2.462 \pm 0.032)\times 10^{-2}
In the context of searches for exotic tensor and scalar terms we get:
F_{T}/f_{+}(0) = (1.20 \pm 1.6) \times 10^{-2}
F_{S}/f_{+}(0) = (0.154 \pm 0.5) \times 10^{-2}
Autor primario
Prof.
Vladimir Obraztsov
(Institute for High Energy Physics, Protvino, Russian Federation)
