The T2K experiment has performed a search for $
u_e$ disappearance due to
sterile neutrinos using $5.9 imes 10^{20}$ protons on target for a baseline
of $280 m$ in a neutrino beam peaked at about $500 MeV$. A sample of
u_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 $sin^2 2 heta_{ee} > 0.3$
for $Delta m^2_{eff} > 7 eV^2 / c^4$.
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