Recent T2K Neutrino Oscillation Results
Dr. Alessandro Bravar (Université de Genève)

Neutrino oscillations from T2K after the 1st year of running

T2K (Tokai-to-Kamioka) is a long-baseline neutrino oscillation experiment. T2K uses 30 GeV protons from the new J-PARC Main Ring accelerator, located in Tokai, Japan, to generate a high-intensity off-axis neutrino beam aimed at the Super-Kamiokande far detector. The experiment started taking data in 2010.
Primarily, T2K searches for oscillations of muon neutrinos into electron neutrinos. T2K will also make precise measurements of the atmospheric oscillation parameters via muon neutrino disappearance as well as precise measurements of neutrino-nucleon interactions.

First results based on data accumulated from January 2010 to March 2011 are presented. Six electron neutrino events pass the selection criteria for electron appearance at Super-Kamiokande, whereas the expected number of background events is 1.5±0.3. The probability of a fluctuation of the background is 0.7% (2.5 sigma significance).
Our conclusion is that we observe an indication of nu_mu to nu_e appearance, opening the way to search for CP violation in the leptonic sector.

I will summarize the status of the T2K experiment, will talk about the near term plans for the next years, and will discuss implications of the nu_e appearance result.