3+1 and 3+2 sterile neutrino fits

Journal Article · Sat Oct 01 04:00:00 EDT 2011 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.84.073008· OSTI ID:21607754

Giunti, Carlo; Laveder, Marco ^[1]

---

1. INFN, Sezione di Torino, Via P. Giuria 1, I-10125 Torino (Italy)

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.

• OSTI ID: 21607754
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 7 Vol. 84; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
CP INVARIANCE
ELECTRON NEUTRINOS
ELEMENTARY PARTICLES
FERMIONS
INVARIANCE PRINCIPLES
LEPTONS
MASSLESS PARTICLES
MUON NEUTRINOS
NEUTRINO OSCILLATION
NEUTRINOS