1304.6259 (T. J. C. Bezerra et al.)

A Global Fit Determination of Effective $Δm_{31}^2$ from Baseline
Dependence of Reactor $\barν_e$ Disappearances    [PDF]

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

Recently, three reactor neutrino experiments, Daya Bay, Double Chooz and RENO have directly measured the neutrino mixing angle $\theta_{13}$. In this paper, another important oscillation parameter, effective $\Delta m_{31}^2$ (= $\Delta \tilde{m}_{31}^2$) is measured using baseline dependence of the reactor neutrino disappearances. A global fit is applied to publicly available data and $\Delta \tilde{m}_{31}^2 = 2.95^{+0.59}_{-1.07} \times 10^{-3}$ eV$^2$, $\sin^22\theta_{13} = 0.099^{+0.024}_{-0.018}$ are obtained by setting both parameters free. This result is complementary to $\Delta tilde{m}_{31}^2$ to be measured by spectrum shape analysis. The measured $\Delta \tilde{m}_{31}^2$ is consistent with $\Delta \tilde{m}_{32}^2$ measured by $\nu_{\mu}$ disappearance in MINOS, T2K and atmospheric neutrino experiments within errors. The minimum $\chi^2$ is small, which means the results from the three reactor neutrino experiments are consistent with each other.

View original: http://arxiv.org/abs/1304.6259