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# Neutrino Oscillation Physics Potential of the T2K Experiment

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### Abstract

The observation of the recent electron neutrino appearance in a muon neutrino beam and the high-precision measurement of the mixing angle $$\theta_{13}$$ have led to a re-evaluation of the physics potential of the T2K long-baseline neutrino oscillation experiment. Sensitivities are explored for CP violation in neutrinos, non-maximal $$\sin^22\theta_{23}$$, the octant of $$\theta_{23}$$, and the mass hierarchy, in addition to the measurements of $$\delta_{CP}$$, $$\sin^2\theta_{23}$$, and $$\Delta m^2_{32}$$, for various combinations of $$\nu$$-mode and $$\bar{\nu}$$-mode data-taking. With an exposure of $$7.8\times10^{21}$$~protons-on-target, T2K can achieve 1-$$\sigma$$ resolution of 0.050(0.054) on $$\sin^2\theta_{23}$$ and $$0.040(0.045)\times10^{-3}~\rm{eV}^2$$ on $$\Delta m^2_{32}$$ for 100\%(50\%) neutrino beam mode running assuming $$\sin^2\theta_{23}=0.5$$ and $$\Delta m^2_{32} = 2.4\times10^{-3}$$ eV$$^2$$. T2K will have sensitivity to the CP-violating phase $$\delta_{\rm{CP}}$$ at 90\% C.L. or better over a significant range. For example, if $$\sin^22\theta_{23}$$ is maximal (i.e $$\theta_{23}$$=$$45^\circ$$) the range is $$-115^\circ<\delta_{\rm{CP}}<-60^\circ$$ for normal hierarchy and $$+50^\circ<\delta_{\rm{CP}}<+130^\circ$$ for inverted hierarchy. When T2K data is combined with data from the NO$$\nu$$A experiment, the region of oscillation parameter space where there is sensitivity to observe a non-zero $$\delta_{CP}$$ is substantially increased compared to if each experiment is analyzed alone.

### Author and article information

###### Journal
2014-09-26
2015-02-10
10.1093/ptep/ptv031
1409.7469