Combining Accelerator and Reactor Measurements of theta₁3; The First Result

Original · EN

The lepton mixing angle theta₁3, the only unknown angle in the standard three-flavor neutrino mixing scheme, is finally measured by the recent reactor and accelerator neutrino experiments. We perform a combined analysis of the data coming from T2K, MINOS, Double Chooz, Daya Bay and RENO experiments and find sin² 2theta₁3 = 0.096 ± 0.013 (± 0.040) at 1 sigma (3 sigma) CL and that the hypothesis theta₁3 = 0 is now rejected at a significance level of 7.7 sigma. We also discuss the near future expectation on the precision of the theta₁3 determination by using expected data from these ongoing experiments.