Measurement of neutrino and antineutrino oscillations by the T2K experiment including a new additional sample of nu(e) interactions at the far detector
By K. Abe, O. Drapier, K. Huang, M. Barbi, C. Checchia, J. Kim, E. Mazzucato, C. Densham, R. Owen, S. Nakayama and 285 more. 2017
160 citations recorded by the source corpus.
The T2K experiment reports an updated analysis of neutrino and antineutrino oscillations in appearance and disappearance channels. A sample of electron neutrino candidates at Super-Kamiokande in which a pion decay has been tagged is added to the four single-ring samples used in previous T2K oscillation analyses. Through combined analyses of these five samples, simultaneous measurements of four oscillation parameters, |Δm322|, sin2θ23, sin2θ13, and δCP and of the mass ordering are made. A set of studies of simulated data indicates that the sensitivity to the oscillation parameters is not limited by neutrino interaction model uncertainty. Multiple oscillation analyses are performed, and frequentist and Bayesian intervals are presented for combinations of the oscillation parameters with and without the inclusion of reactor constraints on sin2θ13. When combined with reactor measurements, the hypothesis of CP conservation (δCP=0 or π) is excluded at 90% confidence level. The 90% confidence region for δCP is [-2.95,-0.44] ([-1.47,-1.27]) for normal (inverted) ordering. The central values and 68% confidence intervals for the other oscillation parameters for normal (inverted) ordering are Δm322=2.54±0.08(2.51±0.08)×10−3 eV2/c4 and sin2θ23=0.55-0.09+0.05 (0.55-0.08+0.05), compatible with maximal mixing. In the Bayesian analysis, the data weakly prefer normal ordering (Bayes factor 3.7) and the upper octant for sin2θ23 (Bayes factor 2.4).
Subfields: Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/a0de1ec48def89fed6e95922af6067bfcc67dbc9
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In Nuclear and High Energy Physics
Citations in the corpus
- Modular A4 invariance and neutrino mixing (2018, background): “In particular, the recent data of both T2K [1, 2] and NOνA [3, 4] imply that the atmospheric neutrino mixing angle θ23 is expected to be near the maximal angle 45 ◦.”
- Global analysis of three-flavour neutrino oscillations: synergies and tensions in the determination of θ23, δCP, and the mass ordering (2018, methodology): “We include latest data from the MINOS [15, 16], T2K [17, 18], and NOvA [19, 20] long-baseline accelerator experiments from νμ disappearance and νμ → νe appearance”