Considering four-neutrino schemes of type 3+1, we identify four small regions of the neutrino mix... more Considering four-neutrino schemes of type 3+1, we identify four small regions of the neutrino mixing parameter space compatible with all data. Assuming a small mixing between the sterile neutrino and the isolated mass eigenstate we show that large νμ → ντ and νe → ντ transitions are predicted in short-baseline experiments and could be observed in the near future in dedicated experiments. We discuss also implications for solar, atmospheric and long-baseline neutrino experiments and we present a formalism that allows to describe in 3+1 schemes atmospheric neutrino oscillations, long-baseline νμ disappearance and νμ → ντ transitions in matter. PACS numbers: 14.60.St Typeset using REVTEX
The theory and phenomenology of light sterile neutrinos at the eV mass scale is reviewed. The rea... more The theory and phenomenology of light sterile neutrinos at the eV mass scale is reviewed. The reactor, Gallium and LSND anomalies are briefly described and interpreted as indications of the existence of short-baseline oscillations which require the existence of light sterile neutrinos. The global fits of short-baseline oscillation data in 3+1 and 3+2 schemes are discussed, together with the implications for β-decay and neutrinoless double-β decay. The cosmological effects of light sterile neutrinos are briefly reviewed and the implications of existing cosmological data are discussed. The review concludes with a summary of future perspectives. PACS numbers: 14.60.Pq, 14.60.Lm, 14.60.St, 98.80.-k
We suggest the possibility that the anomalies observed in the LSND experiment and the Gallium rad... more We suggest the possibility that the anomalies observed in the LSND experiment and the Gallium radioactive source experiments may be due to neutrino oscillations generated by a large squared-mass difference of about 20–30 eV2. We consider the simplest 3+1 four-neutrino scheme that can accommodate also the observed solar and atmospheric neutrino oscillations. We show that, in this framework, the disappearance of [Formula: see text] and [Formula: see text] in short-baseline neutrino oscillation experiments is mainly due to active-sterile transitions. The implications of the first MiniBooNE results, appeared after the completion of this paper, are discussed in an addendum.
... [9] S. Galli, M. Martinelli, A. Melchiorri, L. Pagano, BD Sherwin, DN Spergel, Phys. Rev. D82... more ... [9] S. Galli, M. Martinelli, A. Melchiorri, L. Pagano, BD Sherwin, DN Spergel, Phys. Rev. D82 (2010) 123504. ... [12] S. Das, TA Marriage, PAR Ade, P. Aguirre, M. Amir, JW Appel, LF Barrientos, ES Battistelli et al., Astrophys. J. 729 (2011) 62; JW Fowler et al. ...
Considering four-neutrino schemes of type 3+1, we identify four small regions of the neutrino mix... more Considering four-neutrino schemes of type 3+1, we identify four small regions of the neutrino mixing parameter space compatible with all data. Assuming a small mixing between the sterile neutrino and the isolated mass eigenstate we show that large νμ → ντ and νe → ντ transitions are predicted in short-baseline experiments and could be observed in the near future in dedicated experiments. We discuss also implications for solar, atmospheric and long-baseline neutrino experiments and we present a formalism that allows to describe in 3+1 schemes atmospheric neutrino oscillations, long-baseline νμ disappearance and νμ → ντ transitions in matter. PACS numbers: 14.60.St Typeset using REVTEX
The theory and phenomenology of light sterile neutrinos at the eV mass scale is reviewed. The rea... more The theory and phenomenology of light sterile neutrinos at the eV mass scale is reviewed. The reactor, Gallium and LSND anomalies are briefly described and interpreted as indications of the existence of short-baseline oscillations which require the existence of light sterile neutrinos. The global fits of short-baseline oscillation data in 3+1 and 3+2 schemes are discussed, together with the implications for β-decay and neutrinoless double-β decay. The cosmological effects of light sterile neutrinos are briefly reviewed and the implications of existing cosmological data are discussed. The review concludes with a summary of future perspectives. PACS numbers: 14.60.Pq, 14.60.Lm, 14.60.St, 98.80.-k
We suggest the possibility that the anomalies observed in the LSND experiment and the Gallium rad... more We suggest the possibility that the anomalies observed in the LSND experiment and the Gallium radioactive source experiments may be due to neutrino oscillations generated by a large squared-mass difference of about 20–30 eV2. We consider the simplest 3+1 four-neutrino scheme that can accommodate also the observed solar and atmospheric neutrino oscillations. We show that, in this framework, the disappearance of [Formula: see text] and [Formula: see text] in short-baseline neutrino oscillation experiments is mainly due to active-sterile transitions. The implications of the first MiniBooNE results, appeared after the completion of this paper, are discussed in an addendum.
... [9] S. Galli, M. Martinelli, A. Melchiorri, L. Pagano, BD Sherwin, DN Spergel, Phys. Rev. D82... more ... [9] S. Galli, M. Martinelli, A. Melchiorri, L. Pagano, BD Sherwin, DN Spergel, Phys. Rev. D82 (2010) 123504. ... [12] S. Das, TA Marriage, PAR Ade, P. Aguirre, M. Amir, JW Appel, LF Barrientos, ES Battistelli et al., Astrophys. J. 729 (2011) 62; JW Fowler et al. ...
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