Abstract
T2K reports its first measurements of the parameters governing the disappearance of in an off-axis beam due to flavor change induced by neutrino oscillations. The quasimonochromatic 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 survival probability is expected to be minimal. Using a data set corresponding to protons on target, 34 fully contained -like events were observed. The best-fit oscillation parameters are and with 68% confidence intervals of and , respectively. These results are in agreement with existing antineutrino parameter measurements and also with the disappearance parameters measured by T2K.
- Received 8 December 2015
DOI:https://doi.org/10.1103/PhysRevLett.116.181801
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Published by the American Physical Society