Search for short baseline ν_e disappearance with the T2K near detector

The T2K experiment has performed a search for ν_e disappearance due to sterile neutrinos using 5.9×10²⁰ protons on target for a baseline of 280m in a neutrino beam peaked at about 500MeV. A sample of ν_e CC interactions in the off-axis near detector has been selected with a purity of 63% and an efficiency of 26%. The p-value for the null hypothesis is 0.085 and the excluded region at 95% CL is approximately sin²2θ_ee > 0.3 for Δm²_eff > 7eV²/c⁴.

Data release

• arXiv preprint: https://arxiv.org/abs/1410.8811
• DOI: https://doi.org/10.1103/PhysRevD.91.051102
• Reference: Phys. Rev. D 91 051102 (2015)