Combined Analysis of Neutrino and Antineutrino Oscillations at T2K
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T2K reports its first results in the search for CP violation in neutrino oscillations using appearance and disappearance channels for neutrino- and antineutrino-mode beams. The data include all runs from January 2010 to May 2016 and comprise 7.482 × 10 protons on target in neutrino mode, which yielded in the far detector 32 e-like and 135 μ-like events, and 7.471 × 10 protons on target in antineutrino mode, which yielded 4 e-like and 66 μ-like events. Reactor measurements of sin 2θ have been used as an additional constraint. The one-dimensional confidence interval at 90% for the phase δ[CP] spans the range (−3.13, −0.39) for normal mass ordering. The CP conservation hypothesis (δCP = 0, π) is excluded at 90% C.L.
- Physical Review Letters
Physical Review Letters 118(15), 2017-04-14
American Physical Society (APS)