LSND, MiniBoone…

LSND and miniBoone oscillation results

From 1995, the LSND experiment looked for νe in a νμ neutrino beam produced at the Los Alamos laboratory. The result was the observation of an excess of νe interpreted as neutrino oscillation with parameters (Δm2 ~ 1eV2) not compatible with other experiments for a two neutrino oscillation [Ath95]. The final result in 2001 confirmed the excess [Agu01]. They interpreted their result by the existence of a sterile neutrino of mass greater than 0.4 eV.

The MiniBooNE experiment was set up at Fermilab to confirm or infirm the LSND result. Their 2007 result excluded an oscillation νμ to νe [Agu07], but their 2010 result finds an oscillation νμ to νe compatible with that of LSND [Agu10].

The results of LSND and MiniBooNE are still controversial, since cosmological observations tend to disagree with their conclusion on the existence of a fourth neutrino.


Ath95C. Athanassopoulos et al., LSND collaborationCandidate events for antineutrino muon - antineutrino electron oscillationsPhys. Rev. Lett. 75 (1995) 2650
Agu01A. Aguilar et al., LSND collaborationEvidence for neutrino oscillations from the observation of antineutrino electron appearance in an antineutrino muon beamPhys. Rev. D64 (2001) 112007; arXiv:hep-ex/0104049
Are07A.A. Aguilar Arevalo et al., MiniBooNE collaborationSearch for electron neutrino appearance at the Dm2 ~ 1 eV2Phys. Rev. Lett. 98 (2007) 231801; arXiv:0704.1500
Agu10A.A. Aguilar Arevalo et al., MiniBooNE collaborationEvent excess in the MiniBooNE search for muon antineutrino to electron antineutrinoPhys. Rev. Lett. 105 (2010) 181801; arXiv:1007.1150