T2K presents first CP violation search result

New data support growing hint of different oscillation probabilities for neutrinos and antineutrinos The T2K Collaboration presented new results on neutrino and antineutrino oscillations at the 27th International Conference on Neutrino Physics and Astrophysics (Neutrino 2016) at Imperial College London.  T2K’s new data continue to prefer maximal mixing in the atmospheric angle (θ23), a value…

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J-PARC Nu Beam Power Exceeds 400 kW!

The J-PARC neutrino beam, which provides neutrinos and antineutrinos for the T2K experiment, has exceeded 400 kW beam power.  A new Main Ring accelerator tune allowed the beam power to exceed the 400 kW threshold on May 20, and the T2K beam ran stably above 400 kW from May 23 until May 27, when the…

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T2K PhD students win thesis prizes

Two former T2K PhD students have won thesis awards for their work on T2K. Dr Patrick de Perio won the CAP Division of Particle Physics Thesis Award for his thesis entitled ”Joint Three-Flavour Oscillation Analysis of νμ Disappearance and νe Appearance in the T2K Neutrino Beam.”  Dr de Perio, who earned his PhD at the University of…

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Dr Akira Konaka wins prestigious award for subatomic physics

Dr Akira Konaka of  TRIUMF (Canada) has been awarded the 2016 CAP-TRIUMF Vogt Medal for Contributions to Subatomic Physics.  The award was given “for his outstanding contributions to the T2K long-baseline neutrino experiment, including his leadership in establishing the collaboration.” Konaka will be presented with his medal at the CAP Congress (hosted by the University of…

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T2K run extension being studied

The T2K collaboration is considering the improvements in physics sensitivity, especially for CP violation, from an extension of the running time with beam power of ~1.3 MW. An Expression of Interest for the T2K extension was presented to the J-PARC PAC held  January 13-15, 2016.

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