1206.6017 (T. J. C. Bezerra et al.)

Measurement of Effective $Δm_{31}^2$ using Baseline Differences of
Daya Bay, RENO and Double Chooz Reactor Neutrino Experiments    [PDF]

T. J. C. Bezerra, H. Furuta, F. Suekane

In 2011 and 2012, three reactor neutrino experiments, Double Chooz, Daya Bay and RENO showed positive signals of reactor neutrino disappearance and measured a mixing parameter sin^2(2th13) at average baselines 1.05, 1.65 and 1.44km, respectively. It is possible to measure effective Dm31^2 from distortion of neutrino energy spectrum (E dependence of the oscillation) in those experiments. However, since it requires a precise energy calibration, such measurements have not been reported yet. Dm31^2 can also be measured from baseline (L) dependence of the neutrino oscillation. In this paper, Dm31^2 is measured from disappearance probabilities of the three reactor experiments which have different baselines, to be 2.99^{+1.13}_{-1.58}(^{+0.86}_{-0.88}) X 10^{-3}eV^2, where the errors are two (one) dimensional uncertainties. This is consistent with Dm32^2 measured by \nu_{\mu} disappearance in accelerator experiments. Importance of Dm31^2 measurement and future possibilities are also discussed.

View original: http://arxiv.org/abs/1206.6017