Updated Global 3+1 Analysis of Short-BaseLine Neutrino Oscillations

Abstract

We present the results of an updated fit of short-baseline neutrino oscillation data in the framework of 3+1 active-sterile neutrino mixing. We first consider ${\nu }_e$ and ${\bar{\nu }}_e$ disappearance in the light of the Gallium and reactor anomalies. We discuss the implications of the recent measurement of the reactor ${\bar{\nu }}_e$ spectrum in the NEOS experiment, which shifts the allowed regions of the parameter space towards smaller values of $|U_{e4}{|}^2$. The beta-decay constraints allow us to limit the oscillation length between about 2 cm and 7 m at $3\sigma$ for neutrinos with an energy of 1 MeV. We then consider the global fit of the data in the light of the LSND anomaly, taking into account the constraints from ${\nu }_e$ and ${\nu }_{\mu }$ disappearance experiments, including the recent data of the MINOS and IceCube experiments. The combination of the NEOS constraints on $|U_{e4}{|}^2$ and the MINOS and IceCube constraints on $|U_{\mu 4}{|}^2$ lead to an unacceptable appearance-disappearance tension which becomes tolerable only in a pragmatic fit which neglects the MiniBooNE low-energy anomaly. The minimization of the global ${\chi }^2$ in the space of the four mixing parameters $\Delta m_{41}^2$, $|U_{e4}{|}^2$, $|U_{\mu 4}{|}^2$, and $|U_{\tau 4}{|}^2$ leads to three allowed regions with narrow $\Delta m_{41}^2$ widths at $\Delta m_{41}^2\approx 1.7$ (best-fit), 1.3 (at $2\sigma$), 2.4 (at $3\sigma$) eV${}^2$. The restrictions of the allowed regions of the mixing parameters with respect to our previous global fits are mainly due to the NEOS constraints. We present a comparison of the allowed regions of the mixing parameters with the sensitivities of ongoing experiments, which show that it is likely that these experiments will determine in a definitive way if the reactor, Gallium and LSND anomalies are due to active-sterile neutrino oscillations or not.

39 pages; improved treatment of the reactor flux uncertainties and other minor corrections

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