Explaining the MiniBooNE Excess Through a Mixed Model of Oscillation and Decay

Stefano Vergani, N.W Kamp, A. Diaz, C.A Argüelles, J.M Conrad, M.H Shaevitz, M.A Uchida
2022 Proceedings of The 22nd International Workshop on Neutrinos from Accelerators — PoS(NuFact2021)   unpublished
This work presents a model of the electron-like excess observed by the MiniBooNE experiment comprising of oscillations involving two new mass states: 𝜈 4 , at O (1) eV, that participates in oscillations, and N , at O (100) MeV, that decays to 𝜈 + 𝛾 via a dipole interaction. Short-baseline oscillation data sets, omitting MiniBooNE appearance data, are used to predict the oscillation parameters. We simulate the production of N along the Booster Neutrino Beamline via both Primakoff upscattering (𝜈
more » ... 𝐴 → N 𝐴) and Dalitz-like neutral pion decays (𝜋 0 → N 𝜈𝛾). The simulated events are fit to the MiniBooNE neutrino energy and visible scattering angle data separately to find a joint allowed region at 95% CL. A point in this region with a coupling of 3.6 × 10 −7 GeV −1 , N mass of 394 MeV, oscillation mixing angle of 6 × 10 −4 and mass splitting of 1.3 eV 2 has Δ𝜒 2 /𝑑𝑜 𝑓 for the energy fit of 15.23/2 and 37.80/2. This model represents a significant improvement over the traditional single neutrino oscillation model.
doi:10.22323/1.402.0199 fatcat:375ja4o4sbapva6bckxhrk5bue