MiniBooNE and MicroBooNE Combined Fit to a 3+1 Sterile Neutrino Scenario

Abstract

This letter presents the results from the MiniBooNE experiment within a full "3+1" scenario where one sterile neutrino is introduced to the three-active-neutrino picture. In addition to electron-neutrino appearance at short-baselines, this scenario also allows for disappearance of the muon-neutrino and electron-neutrino fluxes in the Booster Neutrino Beam, which is shared by the MicroBooNE experiment. We present the 3+1 fit to the MiniBooNE electron-(anti)neutrino and muon-(anti)neutrino data alone, and in combination with MicroBooNE electron-neutrino data. The best-fit parameters of the combined fit with the exclusive CCQE analysis (inclusive analysis) are $\Delta m^2=0.29e{V}^2(0.33e{V}^2)$, $|U_{e4}{|}^2=0.016(0.500)$, $|U_{\mu 4}{|}^2=0.500(0.500)$, and ${\sin }^2(2{\theta }_{\mu e})=0.0316(1.0)$. Comparing the no-oscillation scenario to the 3+1 model, the data prefer the 3+1 model with a $\Delta {\chi }^2/\text{dof}=24.7/3(17.3/3)$, a $4.3\sigma (3.4\sigma )$ preference assuming the asymptotic approximation given by Wilks' theorem.

10 pages, 4 figures, 2 table

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• Study of light sterile neutrino at the long-baseline experiment options at KM3NeT
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