The analysis of the results of the Neutrino-4 experiment on search for sterile neutrino and comparison with results of other experiments

Abstract

We present new results of measurements of reactor antineutrino flux and spectrum dependence on the distance in the range 6-12 meters from the center of the reactor core at SM-3 reactor (Dimitrovgrad, Russia). Additional measurements were carried out and set of data to perform statistical analysis was almost doubled since the previous report. Using all collected data we performed the model independent analysis on the oscillation parameters $\Delta m_{14}^2$ and ${\sin }^2(2{\theta }_{14})$. The method of coherent summation of results of measurements allows us to directly observe the effect of oscillations. We observed an oscillation effect in vicinity of $\Delta m_{14}^2=(7.25\pm 0.13_{st}\pm 1.08_{sys}){\text{eV}}^2$ and ${\sin }^2(2{\theta }_{14})=0.26\pm 0.08_{st}\pm 0.05_{sys}$. We provide a comparison of our results with results of other experiments on search for sterile neutrino. Combining the result of the Neutrino-4 and the results of measurements of the gallium anomaly and reactor anomaly we obtained value ${\sin }^2(2{\theta }_{14})\approx 0.19\pm 0.04(4.6\sigma )$. Also was performed comparison of Neutrino-4 experimental results with results of other reactor experiments NEOS, DANSS, STEREO, PROSPECT and accelerator experiments MiniBooNE, LSND and the IceCube experiment also. Sterile neutrino mass which can be calculated using the Neutrino-4 data in assumption that $m_4^2\approx \Delta m_{14}^2$ is $m_4=(2.68\pm 0.13)\text{eV}$. Considering estimations of mixing angles obtained in other experiments we can calculate masses of electron neutrino, muon neutrino and tau neutrino: $m_{{\nu }_e}^{\text{eff}}=(0.58\pm 0.09)\text{eV},m_{{\nu }_{\mu }}^{\text{eff}}=(0.42\pm 0.24)\text{eV},m_{{\nu }_{\tau }}^{\text{eff}}\le 0.65\text{eV}$. Extended PMNS matrix for (3 + 1) model with one sterile neutrino is provided, neutrino flavor mixing scheme with sterile neutrino and global fit of reactor experiments.

arXiv comment24 pages, 21 figures. arXiv admin note: text overlap with arXiv:1809.10561

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• A Search for Electron Neutrino Transitions to Sterile States in the BEST Experiment
• Review of sterile neutrino searches at very short-baseline reactor experiments
• The Result of the Neutrino-4 Experiment and the Cosmological Constraints on the Sterile Neutrino
• Exploring the new physics phases in 3+1 scenario in neutrino oscillation experiments
• Status and Perspectives of Neutrino Physics
• Sterile sector impacting the correlations and degeneracies among mixing parameters at the Deep Underground Neutrino Experiment