Analysis of the result of the Neutrino-4 experiment in conjunction with other experiments on the search for sterile neutrinos within the framework of the 3 + 1 neutrino model

Abstract

The correspondence of the results obtained in the Neutrino-4 experiment with the results of the NEOS, DANSS, STEREO, PROSPECT experiments at reactors, the MiniBooNE, LSND, MicroBoone experiments at accelerators, the IceCube experiment and the BEST experiment with a $^{51}Cr$ neutrino source is analyzed. The agreement between the results of the Neutrino-4 experiment and the BEST experiment is discussed. Combining the result of the Neutrino-4 experiment $\Delta m_{14}^2 \approx (7.3 \pm 1.17) \text{eV}^2, \sin^2 2\theta_{14} = 0.36 \pm 0.12_{\text{stat}}$ and the result of the BEST experiment $\sin^2 2\theta_{14} = 0.32 \pm 0.08$, we obtained $\sin^2 2\theta_{14} = 0.33 \pm 0.07 (4.9\sigma)$. The disagreement between the results of the above-mentioned direct experiments with the results of the reactor anomaly, as well as with the limitations from solar and cosmological data, is discussed. It is shown that the results of the above-mentioned direct experiments on the search for sterile neutrinos are consistent within the framework of the 3+1 neutrino model at the available experimental accuracy. The sterile neutrino parameters from the Neutrino-4 and BEST experiments make it possible to estimate the sterile neutrino mass $m_4 = (2.70 \pm 0.22)\text{eV}$ and the effective mass of the electron neutrino $m_{4\nu_e} = (0.82 \pm 0.16)\text{eV}$. The matrix of the 3 + 1 neutrino model and the mixing scheme are presented.