From the T2K Collaboration:
“At the 2012 Neutrino conference in Kyoto, Japan, the T2K collaboration presented new results on electron neutrino appearance from muon neutrino that confirmed their previous published results in PRL, in July 2011, which reported the first single experimental indication that θ13 is non-zero and large with a 2.5 σ level of significance.
Based on the data collected until May 15, 2012, corresponding to 2.56×1020 POT, 10 “electron neutrino appearance” candidate events were observed in the T2K far detector, Super-Kamiokande. This observation further solidifies the previous result. We now find that the probability of background fluctuation to yield 10 or more events (p-value) is 0.08% corresponding to a 3.2 σ level of significance, making it extremely unlikely that a statistical fluctuation is at the origin of the observed events.”
