3+1 and 3+2 Sterile Neutrino Fits
Jul, 20119 pages
Published in:
- Phys.Rev.D 84 (2011) 073008
e-Print:
- 1107.1452 [hep-ph]
Report number:
- EURONU-WP6-11-37
View in:
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Abstract: (arXiv)
We present the results of fits of short-baseline neutrino oscillation data in 3+1 and 3+2 neutrino mixing schemes. In spite of the presence of a tension in the interpretation of the data, 3+1 neutrino mixing is attractive for its simplicity and for the natural correspondence of one new entity (a sterile neutrino) with a new effect (short-baseline oscillations). The allowed regions in the oscillation parameter space can be tested in near-future experiments. In the framework of 3+2 neutrino mixing there is less tension in the interpretation of the data, at the price of introducing a second sterile neutrino. Moreover, the improvement of the parameter goodness of fit is mainly a statistical effect due to an increase of the number of parameters. The CP violation in short-baseline experiments allowed in 3+2 neutrino mixing can explain the positive antinu_mu -> antinu_e signal and the negative nu_mu -> nu_e measurement in the MiniBooNE experiment. For the CP-violating phase we obtained two minima of the marginal chi^2 close to the two values where CP-violation is maximal.Note:
- 9 pages
- 14.60.Pq
- 14.60.Lm
- 14.60.St
- neutrino: mixing
- neutrino: sterile
- CP: violation
- neutrino: oscillation
- BooNE
- neutrino: nuclear reactor
- neutrino: mixing angle
References(69)
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