1205.5626 (Thierry Lasserre et al.)

Comment on Phys. Rev. Lett. 108, 191802 (2012): "Observation of Reactor
Electron Antineutrino Disappearance in the RENO Experiment"    [PDF]

Thierry Lasserre, Guillaume Mention, Michel Cribier, Antoine Collin, Vincent Durand, Vincent Fischer, Jonathan Gaffiot, David Lhuillier, Alain Letourneau, Matthieu Vivier

The RENO experiment recently reported the disappearance of reactor electron antineutrinos consistent with neutrino oscillations, with a significance of 4.9 standard deviations. The published ratio of observed to expected number of antineutrinos in the far detector is R=0.920 +-0.009(stat.) +-0.014(syst.) and corresponds to sin^2 2theta13 = 0.113 +-0.013(stat.) +-0.019(syst), using a rate-only analysis. In this letter we reanalyze the data and we find a ratio R=0.903 +-0.01(stat.), leading to sin^2 2theta13 = 0.135. Moreover we show that the sin^2 2theta13 measurement still depend of the prompt high energy bound beyond 4 MeV, contrarily to the expectation based on neutrino oscillation.

View original: http://arxiv.org/abs/1205.5626