3+1 and 3+2 Sterile Neutrino Fits

By C. Giunti, M. Laveder. 2011

147 citations recorded by the source corpus.

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 in the number of parameters. The CP violation in short-baseline experiments allowed in 3+2 neutrino mixing can explain the positive {nu}{sub {mu}{yields}{nu}e} signal and the negative {nu}{sub {mu}{yields}{nu}e} measurement in the MiniBooNE experiment. For the CP-violating phase, we obtained two minima of the marginal {chi}{sup 2} close to the two values where CP violation is maximal.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/97dc9fd5220eef1762c0db28c11730d516068765

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In Nuclear and High Energy Physics

1. C. Giunti
2. Julien Lesgourgues
3. C. Buck
4. S. Boser
5. Anne Schukraft
6. S. Mertens
7. Michael Wurm
8. L. Ludhova

Citations in the corpus

• Status of light sterile neutrino searches (2019, background): “1 More complicated schemes with sterile neutrinos have been also considered in the literature: (3+2) [24–31], (3+3) [26], (3+1+1) [32–36], and (1+3+1) [37, 38].”