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T2K Experiment enters a new phase with significantly improved sensitivity for its world leading neutrino oscillation research

The T2K Collaboration has started data taking using the enhanced neutrino beam and new neutrino near-detectors from December 2023. The KEK/J-PARC center has upgraded the main ring accelerator and the neutrino beamline to increase the beam power. T2K has also upgraded its neutrino production instruments. The stable operation of neutrino beam has been successfully achieved…

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Sara Bolognesi won the 2024 CNRS silver medal

Sara Bolognesi has been awarded the 2024 silver medal of the CNRS (French National Centre for Scientific Research) in the field of nuclear and particle physics. Each year, this prestigious prize distinguishes a researcher for the originality, quality, and importance of his or her work, recognized at international level.  Dr. Bolognesi receives this award for…

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A.K.Ichikawa, the former T2K spokesperson, won the 2023 Nishina prize

A.K.Ichikawa (left), the former T2K spokesperson, won the Nishina prize in 2023 for “Constraining CP violating phase δ in neutrino oscillations“.  As stated in her citation, Ichikawa has led research in all aspects of the T2K experiment, including in the development of elements of the neutrino beamline, and her service as analysis co-coordinator and spokesperson.…

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Kendall Mahn Elected as the new International co-spokesperson of T2K Collaboration, Replacing Federico Sanchez

The T2K collaboration has elected Kendall Mahn, a professor at Michigan State University, as its new International Co-Spokesperson, replacing Federico Sanchez from Geneva.  She has previously served in multiple roles on T2K, notably as T2K analysis co-coordinator. Kendall is excited to serve the T2K collaboration, as the collaboration makes use of the upgraded beamline, new…

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T2K physics coordinator Christophe Bronner received the Young Scientist Award of the Physical Society of Japan

He was recognized for his contributions to a recent T2K publications (Improved constraints on neutrino mixing from the T2K experiment with 3.13×1021 protons on target Phys. Rev. D 103, 112008(2021)). Christophe has made longstanding  contributions to T2K, including serving as one of the coordinators for the first joint collaborative analysis of T2K beam and SK…

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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