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Muon neutrino disappearance at T2K

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Article number012018
<mark>Journal publication date</mark>15/04/2015
<mark>Journal</mark>Journal of Physics: Conference Series
Issue number1
Number of pages3
Publication StatusPublished
<mark>Original language</mark>English
Event1st Prospects in Neutrino Physics Conference, NuPhys 2013 - London, United Kingdom
Duration: 19/12/201320/12/2013


Conference1st Prospects in Neutrino Physics Conference, NuPhys 2013
Country/TerritoryUnited Kingdom


The T2K experiment has observed the disappearance of muon neutrinos from the J-PARC muon-neutrino beam. Using data corresponding to 3.01 × 1020 protons on target, 58 muon neutrino event candidates were observed; 205 ± 17 (syst.) events are expected under the no-oscillation hypothesis. A fit to the observed rate and energy spectrum in a neutrino oscillation framework with three active neutrino flavours in constant density matter, assuming the normal mass hierarchy, yields a best fit mixing angle sin2 θ23 = 0.514 ± 0.082 and best fit mass squared splitting |Δm232| = 2.44+0.17-0.15 × 10-3 eV2/c4, which corresponds to the maximal disappearance probability.