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2019

Decaying Sterile Neutrinos and the Short Baseline Oscillation Anomalies

Dentler, Mona, Esteban, Ivan, Kopp, Joachim et al.

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The MiniBooNE experiment has observed a significant excess of electron neutrinos in a muon neutrino beam at source-detector distances too short to be compatible with standard neutrino oscillations.

The most straightforward explanation for this signal in terms of oscillations between Standard Model neutrinos and a new, sterile, neutrino, is disfavored by null results from experiments looking for muon neutrino disappearance.
Here, we discuss the possibility that MiniBooNE data are instead explained by a sterile neutrino that decays quickly back into active neutrinos plus a light boson.
The flavor composition of the secondary neutrinos is determined by the sterile neutrino mixing angles, and we show that the data is best explained if the sterile neutrino mixes mostly with electron neutrinos.

Decaying Sterile Neutrinos and the Short Baseline Oscillation Anomalies · Around

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