Indication of Electron Neutrino Appearance from an Accelerator-produced Off-axis Muon Neutrino Beam

T2K Collaboration, K. Abe, N. Abgrall +408

The T2K experiment observes indications of ${\nu }_{\mu }\to {\nu }_e$ appearance in data accumulated with $1.43\times 10^{20}$ protons on target. Six events pass all selection criteria at…