T2K sees its first event in antineutrino beam mode
T2K resumed data taking on 26 May 2014 after a 1-year shutdown caused by the hadron hall radiation accident. Many thanks are due to the J-PARC directorate and the staff members for their incredible effort over many months to make this possible! During the beamline commissioning, the first antineutrino beam at J-PARC (and the first…
T2K Beam Group wins 2013 Suwa Prize
The T2K Neutrino Beam group was awarded the 2013 Suwa Prize by the FAS (Foundation for High Energy Accelerator Science), for their contribution to the discovery of electron neutrino appearance by creating and operating the highest intensity neutrino beam facility. The Beam Group is responsible for design, operation, and maintenance of equipment that monitors the…
T2K member Atsuko Ichikawa wins the first Yuasa Prize
Prof. Atsuko Ichikawa (Kyoto University) was named the first recipient of the Yuasa Prize, for women making exceptional research achievements in science. The prize commemorates Dr. Toshiko Yuasa (1909-1980), who made significant contributions to physics while working in France at the College de France and Institut de Physique Nucléaire d’Orsay. Prof. Ichikawa was awarded the prize…
T2K submits paper that conclusively shows muon neutrinos transform to electron neutrinos
The T2K experiment has submitted a paper to Physical Review Letters, reporting the definitive observation of electron neutrino appearance in a high-purity muon neutrino beam that travels 295 km, from the J-PARC accelerator complex to the Super-Kamiokande underground neutrino detector. A total of 28 electron neutrino events were detected, compared to 4.92 ± 0.55 background…
New results from T2K conclusively show muon neutrinos transform to electron neutrinos
Today at the European Physical Society meeting in Stockholm, the international T2K collaboration announced a definitive observation of muon neutrino to electron neutrino transformation. In 2011, the collaboration announced the first indication of this process, which was then a new type of neutrino oscillation; now, with 3.5 times more data, this transformation is firmly established…
T2K receives a prize from a French science magazine
T2K has been awarded a prestigious prize by La Recherche, a French science magazine. This prize is called “Le Prix La Recherche” and has 12 categories including biology, chemistry, mathematics and medicine. T2K received the physics prize for finding the first indications of oscillations from muon neutrinos to electron neutrinos. Some T2K collaborators can be…
T2K updates its electron-neutrino appearance result using its full dataset obtained by summer 2012
The T2K collaboration presented new results on oscillations from muon neutrinos to electron neutrinos at the 2012 International Conference on High Energy Physics in Melbourne, Australia. These oscillations are predicted by quantum physics if neutrinos have non-zero masses. The new results were obtained with more than twice as much data as the T2K paper published…
T2K Presents New Results that confirms their Electron Neutrino Appearance Results published in July 2011
At the 2012 Neutrino conference in Kyoto, Japan, the T2K collaboration presented new results on electron neutrino appearance from muon neutrino that confirmed their previous published results in PRL, in July 2011, which reported the first single experimental indication that θ13 is non-zero and large with a 2.5 σ level of significance. Based on the…
First T2K beam neutrino event in Super-Kamiokande since March 2011 earthquake
The first T2K beam neutrino event since the earthquake of March 2011 was seen in Super-Kamiokande (T2K’s far detector) on 26th Janaury 2012. It is shown in the event display above, and has a Cherenkov ring produced by a muon in the centre of the image. This muon was produced when a muon neutrino in…
T2K publishes first off-axis measurement of muon-neutrino disappearance
T2K has published the first measurement of muon-neutrino disappearance by an off-axis experiment in Physical Review D at http://prd.aps.org/abstract/PRD/v85/i3/e031103. The T2K beam is mostly composed of muon neutrinos, and 104 muon-neutrino events would have been expected in T2K’s far detector Super Kamiokande if there were no neutrino oscillations. However only 31 such events were observed,…
