T2K presents hint of CP violation by neutrinos

The international T2K Collaboration strengthened its previous hint that the symmetry between matter and antimatter may be violated for neutrino oscillation.  A preliminary analysis of T2K’s latest data rejects the hypothesis that neutrinos and antineutrinos oscillate with the same probability at 95% confidence (2σ) level. With nearly twice the neutrino data in 2017 compared to…

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T2K beam run extension given Stage-1 Status at J-PARC

On 30 Sep, 2016, the KEK-IPNS Director and J-PARC Center Director granted stage-1 status to the T2K collaboration’s proposal for an extended beam data run to search for CP violation by neutrinos.  The proposal requests delivery of 20×10²¹ protons-on-target (POT) by 2026, which would allow the possibility of  3 sigma sensitivity for CP violation. In…

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First T2K CP violation search published

T2K’s first search for violation of charge-parity symmetry (CP violation) was published in Physical Review Letters as an Editors Suggestion in the April 14 edition.  This is the first result from T2K that simultaneously analyses both neutrino and antineutrino data sets. The international  T2K (Tokai-to-Kamioka) collaboration searches for CP violation with both neutrino and antineutrino beams,…

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J-PARC delivers 2.0e21 protons on target

On March 2, the number of protons delivered to the neutrino target of the T2K experiment by the J-PARC accelerator reached an important milestone: 2×10^21 accumulated since January 2010.  Many thanks are due to the J-PARC directorate and the staff members for their outstanding work to make this possible ! The protons are produced by the J-PARC…

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Koichiro Nishikawa wins 2016 Pontecorvo Prize

Professor Koichiro Nishikawa has been awarded the Bruno Pontecorvo Prize for the year 2016. The Bruno Pontecorvo Prize is awarded by the Joint Institute for Nuclear Research (JINR) in Dubna, Russia, for elementary particle physics. The prize commemorates Prof. Bruno Pontecorvo, a pioneering neutrino physicist who worked for many decades at JINR. The Prize was…

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Watch a video about T2K

The T2K Experiment

T2K is a neutrino experiment designed to investigate how neutrinos change from one flavour to another as they travel (neutrino oscillations). An intense beam of muon neutrinos is generated at the J-PARC nuclear physics site on the East coast of Japan and directed across the country to the Super-Kamiokande neutrino detector in the mountains of western Japan. The beam is measured once before it leaves the J-PARC site, using the near detector ND280, and again at Super-K: the change in the measured intensity and composition of the beam is used to provide information on the properties of neutrinos.

Map showing J-PARC and Super-K

Science Goals of T2K

  • the search for CP violation in the neutrino sector
  • the discovery of νμ → νe ( i.e. the confirmation that θ13 > 0 )
  • precision measurements of oscillation parameters in νμ disappearance
  • a search for sterile components in νμ disappearance by observation of neutral-current events
  • world-leading contributions to neutrino-nucleus cross-section measurements