Results on kaon physics from OKA setup at U-70

10th International Conference on Kaon Physics

Obraztsov, V.^1

Institute for High Energy Physics, Protvino, Moscow Region, Russia^1

关键词: Fit parameters;    Kaon physics;    Mixing parameters;    Muon neutrino;    New study;    Parametrizations;    Tensor interaction;    Upper limits;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/800/1/012016/pdf
DOI  :  10.1088/1742-6596/800/1/012016

来源: IOP

【 摘 要 】

Some recent results from OKA setup are presented. First, the decay K+→π0e+υ(Ke3) is studied. About 3.15M events are selected for the analysis. The linear and quadratic slopes for the decay formfactor f+(t) are measured: . For the exotic scalar and tensor interactions we get: FS/f+(0) = (-0.44±0.7±0.24) × 10-2; FT/f+(0) = (0.16±2±1.3) × 10-2. Several alternative parametrizations are tried: the Pole fit parameter is found to be MV= 890 ± 3.7 MeV; the parameter of the Dispersive parametrization is measured to be Λ+= (24.72 ± 0.23) × 10-3. Second, the results of a search for heavy neutrino in the Kμ2decay are shown. The upper limits on the mixing parameter of the heavy neutrino with the muon neutrino |UμH|2are obtained. Typically, |UμH|2≤ 10-6for the region 225 ≤ mH≤ 375 MeV. Third, a new study of the radiative Kμ3decay are presented. The number of signal events is ∼ 580 which is 4 times larger than in previous measurements. which should be compared with 4.7 × 10-4from the theory. An estimate of the T-odd asymmetry gives Aξ= (-0.19±0.05±0.09). A space asymmetry over , where is the angle between photon and muon momenta in the kaon rest frame is measured to be A(cosθ∗) = 0.6±0.05±0.1.