Programme

I.1 -- Invited, VCTP-45

Date: Monday, 12 October 2020

Time: 10:30 - 11:00

An indication of matter-antimatter symmetry violation in neutrinos with the T2K experiment

Nguyen Thi Hong Van

Institute of Physics, Vietnam Academy of Science and Technology

The Universe is made up almost of matter but not of antimatter. This matter-antimatter asymmetry is a mystery of science since the laws of physics are essentially symmetrical. Under the language of particle physics, this asymmetry is called CP violation where "C" stands for "Charge-conjugation" symmetry and "P" stands for "Parity reversal" symmetry. Violation of the CP symmetry was observed for the first time in 1964 in the quark sector, however, this CP violation is too small in order to explain the imbalance of matter-antimatter in the Universe. Therefore, a CP violation in the lepton sector, which so far has not yet been observed, is expected to be a potential source for the asymmetry of matter-antimatter in the Universe. Recently, the T2K (Tokai to Kamioka), a long baseline (anti-) neutrino oscillations experiment located in Japan, has published in "Nature" their recent result showing an indication of CP violation in neutrinos. It is shown that the probability for a muon neutrino to become an electron neutrino is different from that of muon antineutrino to become an electron antineutrino, leading to a possible CP violation at 95% confidence level. On behalf of the T2K collaboration, I will present this result together with an overview of the T2K experiment and especially the participation of Vietnam in this experiment.

Presenter: Nguyen Thi Hong Van