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Abstract: In view of the recent results from the MiniBooNE experiment we revisit theglobal neutrino oscillation fit to short-baseline neutrino data by adding oneor two sterile neutrinos with eV-scale masses to the three Standard Modelneutrinos, and for the first time we consider also the global fit with threesterile neutrinos. Four-neutrino oscillations of the (3+1) type have been onlymarginally allowed before the recent MiniBooNE results, and become even moredisfavored with the new data (at the level of $4\sigma$). In the framework ofso-called (3+2) five-neutrino mass schemes we find severe tension betweenappearance and disappearance experiments at the level of more than $3\sigma$,and hence no satistfactory fit to the global data is possible in (3+2) schemes.This tension remains also when a third sterile neutrino is added, and thequality of the global fit does not improve significantly in a (3+3) scheme. Itshould be noted, however, that in models with more than one sterile neutrinothe MiniBooNE results are in perfect agreement with the LSND appearanceevidence, thanks to the possibility of CP violation available in suchoscillation schemes. Furthermore, if disappearance data are not taken intoaccount (3+2) oscillations provide an excellent fit to the full MiniBooNEspectrum including the event excess at low energies.



Autor: Michele Maltoni, Thomas Schwetz

Fuente: https://arxiv.org/







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