Search for short baseline $\nu_e$ disappearance with the T2K near   detector
  The T2K experiment has performed a search for $\nu_e$ disappearance due to sterile neutrinos using $5.9 \times 10^{20}$ protons on target for a baseline of $280 m$ in a neutrino beam peaked at about $500 MeV$. A sample of \nu_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 $sin^2 2 \theta_{ee} > 0.3$ for $\Delta m^2_{eff} > 7 eV^2 / c^4$. 
K. Abe, J. Adam, H. Aihara, T. Akiri, C. Andreopoulos, S. Aoki, A.   Ariga, S. Assylbekov, D. Autiero, M. Barbi, G.J.Barker,...
hep-ex