Four-Neutrino Analysis of 1.5 km Baseline Reactor Antineutrino Oscillations

Figure 5

The 1𝜎,2𝜎, and 3𝜎 exclusion curves are drawn by solid lines. Apparently, a broad range of sin²2𝜃₁₄ apparently remains not excluded. Only Δ𝑚²₄₁>Δ𝑚²₃₁ is considered and sin²2𝜃₁₄>0.2 is excluded at 3𝜎 CL. For (A) specified by Δ𝑚²₃₁=2.83×10⁻³eV², the minimum 𝜒²_min/dof=0.48 is at (Δ𝑚²₄₁,sin²2𝜃₁₄)=(0.039eV²,0.050), while, for (B) specified by Δ𝑚²₃₁=2.32×10⁻³eV², two minima 𝜒²_min/dof=1.06 and 0.85 are located at (Δ𝑚²₄₁,sin²2𝜃₁₄)=(0.0078eV²,0.033) and (0.039eV²,0.049), respectively.