Abstract
Searches for electron antineutrino, muon neutrino, and muon antineutrino disappearance driven by sterile neutrino mixing have been carried out by the Daya Bay and MINOS+ collaborations. This Letter presents the combined results of these searches, along with exclusion results from the Bugey-3 reactor experiment, framed in a minimally extended four-neutrino scenario. Significantly improved constraints on the θ_{μe} mixing angle are derived that constitute the most constraining limits to date over five orders of magnitude in the mass-squared splitting Δm_{41}^{2}, excluding the 90%C.L. sterile-neutrino parameter space allowed by the LSND and MiniBooNE observations at 90%CL_{s} for Δm_{41}^{2}<13 eV^{2}. Furthermore, the LSND and MiniBooNE 99%C.L. allowed regions are excluded at 99% CL_{s} for Δm_{41}^{2}<1.6 eV^{2}.
Highlights
There are, some experimental observations that cannot be accommodated in the threeneutrino mixing model, such as the excess of electronlike events in a muonneutrino beam observed over short baselines by the Liquid Scintillator Neutrino Detector (LSND) [19] and MiniBooNE [20,21] experiments
These observations may be explained by mixing with at least one additional fourth neutrino state with Δm241 ≫ jΔm232j, where the Δm2ji 1⁄4 m2j − m2i represent neutrino masssquared differences, and mi is the mass of the ith mass eigenstate
The addition of such states, a natural occurrence in many extensions of the standard model of particle physics that incorporate neutrino masses [22], results in new neutrino states that are commonly deemed to be sterile in accordance with the tight constraints from precision electroweak measurements [23,24] on the number of neutrinos that couple to the Z boson
Summary
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