VSBL Electron Neutrino Disappearance
Feb, 2009Citations per year
Abstract: (arXiv)
We consider possible indications of Very-Short-BaseLine (VSBL) electron neutrino disappearance into sterile neutrinos in MiniBooNE neutrino data and Gallium radioactive source experiments. We discuss the compatibility of such a disappearance with reactor and MiniBooNE antineutrino data. We find a tension between neutrino and antineutrino data which could be due to: 1) statistical fluctuations; 2) underestimate of systematic uncertainties; 3) exclusion of our hypothesis of VSBL nu_e disappearance; 4) a violation of CPT symmetry. Considering the first possibility, we present the results of a combined fit of all data, which indicate that P_{ee} < 1 with 97.04 CL. We consider also the possibility of CPT violation, which leads to the best-fit value A_{ee}^{CPT,bf} = -0.17 for the asymmetry of the nu_e and antinu_e survival probabilities and A_{ee}^{CPT} < 0 at 99.7 CL.Note:
- 19 pages
- 14.60.Pq
- 14.60.St
- neutrino: oscillation
- neutrino/e
- antineutrino/e
- CPT: violation
- neutrino: sterile
- BooNE
- nuclear reactor
- gallium
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