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Measurement of Muon Antineutrino Oscillations with an Accelerator-Produced Off-Axis Beam

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The T2K Collaboration, F Bay, V Berardi, S Berkman, S Bhadra, A Blondel, S Bolognesi, S Bordoni, S. B Boyd, D Brailsford, A Bravar, C Bronner, M Buizza Avanzini, R. G Calland, S Cao, J Caravaca Rodriguez, S. L Cartwright, R Castillo, M. G Catanesi, A Cervera & 19 more D Cherdack, N Chikuma, G Christodoulou, A Clifton, J Coleman, G Collazuol, L Cremonesi, A Dabrowska, G De Rosa, T Dealtry, P. F Denner, S. R Dennis, C Densham, D Dewhurst, D Di Luise, S Dolan, O Drapier, K. E Duffy, J Dumarchez

Original languageEnglish
Article number181801
JournalPhysical Review Letters
Issue number18
Early online date5 May 2016
Accepted/In press5 May 2016
E-pub ahead of print5 May 2016
Published5 May 2016


King's Authors


T2K reports its first measurements of the parameters governing the disappearance of ¯νμ in an off-axis beam due to flavor change induced by neutrino oscillations. The quasimonochromatic ¯νμ beam, produced with a peak energy of 0.6 GeV at J-PARC, is observed at the far detector Super-Kamiokande, 295 km away, where the ¯νμ survival probability is expected to be minimal. Using a data set corresponding to 4.01×1020 protons on target, 34 fully contained
μ-like events were observed. The best-fit oscillation parameters are sin2(¯θ23)=
0.45 and |Δ¯m232|=2.51×10−3eV2 with 68% confidence intervals of 0.38–0.64 and 2.26–2.80×10−3eV2, respectively. These results are in agreement with existing antineutrino parameter measurements and also with the νμ disappearance parameters measured by T2K.

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