|Dr. Christophe Bronner (ICRR)|
|"T2K neutrino oscillation results with data up to 2017 Summer"|
The Tokai to Kamioka (T2K) experiment is a long baseline neutrino oscillation experiment, in which a neutrino beam is produced in the J-PARC center and sent to the Super-Kamiokande detector 295 km away. The experiment can use either a mainly muon neutrino beam (neutrino running mode) or muon anti-neutrino beam (anti-neutrino running mode) to study and compare the oscillations of neutrinos and anti-neutrinos. After having observed the appearance through oscillation of electron neutrinos in a beam of muon neutrinos, the experiment is now studying the remaining open question in neutrino oscillations, in particular whether they respect CP symmetry and whether the disappearance of muon neutrinos through oscillation is maximal or not.
T2K reported last year an indication of a potential violation of the CP symmetry in neutrino oscillation at 90% CL. Since then the experiment has accumulated additional data, almost doubling the statistics in neutrino running mode, and developed a new analysis with improved event selection in Super-Kamiokande. In this seminar, we will present those evolutions and the neutrino oscillation results obtained with the additional data and improved analysis.