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« Neutrinos from Tokai to Kamioka: oscillations, interactions and the search for CP-Violation »

Stephen Dolan
Lab. Européen Physique Particules (CERN) (Genève, Suisse)

The precise characterisation of neutrino oscillations offers a range of auspicious opportunities in the search for physics beyond the standard model, not least of which is measurement of the CP-violating complex phase in the neutrino mixing matrix (dCP) that governs associated breaking of the symmetry between matter and antimatter. Alongside measurements of many of the other mixing parameters, the Tokai to Kamioka (T2K) experiment has recently published, in Nature, the strongest constraint yet made on dCP, excluding almost half of the possible values at 3s confidence level, through measurements of electron (anti)neutrino appearance in an accelerator-produced muon (anti)neutrino beam. But, despite this considerable achievement, a comprehensive evaluation of CP-violation in the neutrino sector will only be possible with a significant reduction of the associated systematic uncertainties. The most pressing of these uncertainties concern the details of the neutrino-nucleus interactions in the one-to-few GeV region that are used to analyse neutrino oscillations. Currently our inability to model such interactions threatens to pre-maturely limit the sensitivity of current and future neutrino oscillation experiments. However, novel neutrino-nucleus scattering measurements; new detector technology; and collaboration with the nuclear physics community provides a path forward to understanding neutrino interactions at the required level. I will present T2K’s latest analysis of neutrino oscillations, demonstrating the critical role of neutrino-nucleus interaction modelling, before also showing some of T2K’s recent neutrino interaction measurements and its strategy for the future.

mardi 19 mai 2020 - 10:30
Webinaire, Institut d'Astrophysique
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