T2K: CLUES ON THE ASYMMETRY OF THE OSCILLATIONS OF NEUTRINOS AND ANTINEUTRINOS

6 August 2016

SK eventThe T2K (Tokai to Kamioka) international collaboration, in which INFN is participating with roles of responsibility, has presented new results at the 38th International Conference on High Energy Physics (ICHEP) in Chicago, indicating with increasing clarity that oscillation phenomena are not equally likely for neutrinos and their antiparticles (anti-neutrinos). This different behaviour of neutrinos compared to antineutrinos could be the crucial ingredient to answer one of the most important issues with which contemporary physics is faced: why is the universe today dominated by matter, while we imagine that, immediately after the Big Bang, the universe was made up of equal parts of matter and antimatter. Produced at the Japan Proton Accelerator (J-PARC), the T2K beam of muon neutrinos (or antineutrinos) is sent towards the underground Super-Kamiokande detector, 295 kilometres away. During the journey, a muon neutrino can “oscillate”, turning into an electron or tau neutrino. T2K has detected that the number of muon anti-neutrinos oscillating into electron antineutrinos is lower than that of muon neutrinos oscillating into electron neutrinos. The result, still preliminary, must be supported by the results of the data acquisition phase in progress.

 

You might also be interested in

The cavern that will host the Hyper-Kamiokande experiment in Gifu Prefecture, Japan, and a rendering of the future configuration of the experiment. ©University of Tokyo and Nikken Sekkei

Japan: excavation of the gigantic cavern for the Hyper-K experiment completed

Pier Andrea Mandò, Professor at the University of Florence and INFN associate, at LABEC, the INFN Laboratory of nuclear techniques for the Environment and Cultural Heritage

Pier Andrea Mandò awarded the Enrico Fermi Prize 2025 by the Italian Physical Society

Positioning of one of the new ARCA detection units ©KM3NeT

ARCA-51 offshore campaign: 10,000 new eyes for KM3NeT

Infographic of the GW231123 event

LIGO-Virgo-KAGRA and the most massive black hole merger ever detected via gravitational waves

Nobel laureate Takaaki Kajita at the event for Einstein Telescope at Expo2025 Osaka

Expo2025 Osaka: Sardinia for Einstein Telescope in the spotlight with Nobel laureate Kajita

The sustainability of ET, interview with Maria Marsella