Abstract
This chapter describes the measurement of the neutrino oscillations in the T2K experiment. First, the measurements of the T2K neutrino beam at ND280 and Super-K are described. Then, the methods and results of the three-flavor neutrino oscillation analysis are reported.
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- 1.
Although the NC1\(\pi ^0\) events constitute only small percentages of the ND280 selected samples, the NC1\(\pi ^0\) normalization is constrained owing to the correlation between CC1\(\pi ^+\) and NC1\(\pi ^0\) interactions.
- 2.
Further details about the Super-K event selection and reconstruction are found in Ashie et al. [7].
- 3.
Cherenkov radiation threshold energies of electron, muon, pion and proton in water are 0.775, 160, 212 and 1423 MeV, respectively.
- 4.
This \(\pi ^0\) rejection cut was developed in 2013. It removes 69 % of the \(\pi ^0\) background events relative to the previous \(\pi ^0\) rejection cut, with only a 2 % loss in signal efficiency.
- 5.
The reason why the systematic error term is a function of the oscillation parameters as well as the nuisance parameters is described in the next section.
- 6.
The critical limit for the 90 % C.L region for single degree of freedom is 2.71.
- 7.
Prob3++ calculates oscillation probabilities based on the work of Barger et al. [16].
- 8.
- 9.
Minor deviation of the best fit value of \(\sin ^2\theta _{23}\) from 0.5 is due to the secondary term of the \(\nu _\mu \rightarrow \nu _\mu \) oscillation probability formula (Eq. 1.11).
- 10.
Minor deviation of the best fit value of \(\delta _{CP}\) from \(-\pi \)/2 is due to the solar term of the \(\nu _\mu \rightarrow \nu _e\) oscillation probability formula (Eq. 1.17).
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Kikawa, T. (2016). Measurement of Neutrino Oscillations. In: Measurement of Neutrino Interactions and Three Flavor Neutrino Oscillations in the T2K Experiment. Springer Theses. Springer, Singapore. https://doi.org/10.1007/978-981-287-715-4_10
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