| Abstract: | The T2K experiment observes indications of $
u_mu
ightarrow
u_e$
appearance in data accumulated with $1.43 imes10^{20}$ protons on target. Six
events pass all selection criteria at the far detector. In a three-flavor
neutrino oscillation scenario with $|Delta m_{23}^2|=2.4 imes10^{-3}$ eV$^2$,
$sin^2 2 heta_{23}=1$ and $sin^2 2 heta_{13}=0$, the expected number of
such events is 1.5$pm$0.3(syst.). Under this hypothesis, the probability to
observe six or more candidate events is 7$ imes10^{-3}$, equivalent to
2.5$sigma$ significance. At 90% C.L., the data are consistent with
0.03(0.04)$<sin^2 2 heta_{13}<$ 0.28(0.34) for $delta_{
m CP}=0$ and normal
(inverted) hierarchy. |
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