We report measurements by the T2K experiment of the parameters θ23 and ∆m232 governing the disappearance of muon neutrinos and antineutrinos in the three flavor neutrino oscillation model. Utilizing the ability of the experiment to run with either a mainly neutrino or a mainly antineutrino beam, the parameters are measured separately for neutrinos and antineutrinos. Using 7.482 × 1020 POT in neutrino running mode and 7.471 × 1020 POT in antineutrino mode, T2K obtained, sin2(θ23) = 0.51+0−0..0807 and ∆m232 = 2.53+0−0..1513 × 10−3eV2/c4 for neutrinos, and sin2(θ23) = 0.42+0−0..2507 and ∆m232 = 2.55+0−0..3327 × 10−3eV2/c4 for antineutrinos (assuming normal mass ordering). No significant differences between the values of the parameters describing the disappearance of muon neutrinos and antineutrinos were observed.
|Publication status||Published - Apr 21 2017|
ASJC Scopus subject areas