Neutrino Oscillation Physics Potential of the T2K Experiment

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 ${\sin }^{2}2{\theta }_{23}$, the octant of ${\theta }_{23}$, and the mass hierarchy, in addition to the measurements of ${\delta }_{CP}$, ${\sin }^2{\theta }_{23}$, and $\Delta m_{32}^2$, for various combinations of $\nu$-mode and \(\barν\)-mode data-taking. With an exposure of $7.8\times 10^{21}$~protons-on-target, T2K can achieve 1-$\sigma$ resolution of 0.050(0.054) on ${\sin }^2{\theta }_{23}$ and $0.040(0.045)\times 10^{-3}{\mathrm{eV}}^2$ on $\Delta m_{32}^2$ for 100\%(50\%) neutrino beam mode running assuming ${\sin }^2{\theta }_{23}=0.5$ and $\Delta m_{32}^2=2.4\times 10^{-3}$ eV${}^2$. T2K will have sensitivity to the CP-violating phase ${\delta }_{\mathrm{CP}}$ at 90\% C.L. or better over a significant range. For example, if ${\sin }^{2}2{\theta }_{23}$ is maximal (i.e ${\theta }_{23}$=$45^{\circ }$) the range is $-115^{\circ }<{\delta }_{\mathrm{CP}}<-60^{\circ }$ for normal hierarchy and $+50^{\circ }<{\delta }_{\mathrm{CP}}<+130^{\circ }$ 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.

40 pages, 27 figures, accepted by PTEP

References in corpus (8)

• Observation of electron-antineutrino disappearance at Daya Bay
• Indication of Electron Neutrino Appearance from an Accelerator-produced Off-axis Muon Neutrino Beam
• Measurement of Neutrino Oscillation by the K2K Experiment
• New features in the simulation of neutrino oscillation experiments with GLoBES 3.0
• Improved Measurement of Electron Antineutrino Disappearance at Daya Bay
• The T2K Neutrino Flux Prediction
• Observation of a first ${\nu }_{\tau }$ candidate in the OPERA experiment in the CNGS beam
• Statistical Evaluation of Experimental Determinations of Neutrino Mass Hierarchy

Cited by in corpus (10)

• Measurements of neutrino oscillation in appearance and disappearance channels by the T2K experiment with 6.6E20 protons on target
• Physics Potential of a Long Baseline Neutrino Oscillation Experiment Using J-PARC Neutrino Beam and Hyper-Kamiokande
• A Long Baseline Neutrino Oscillation Experiment Using J-PARC Neutrino Beam and Hyper-Kamiokande
• Sensitivity of the T2HKK experiment to the non-standard interaction
• Long-Baseline Neutrino Experiments
• Exploring the effects of Scalar Non Standard Interactions on the CP violation sensitivity at DUNE
• Geometric phases in neutrino oscillations with nonlinear refraction
• Axial-vector transition form factors of the baryon octet to the baryon decuplet with flavor SU(3) symmetry breaking
• Recent Results from Long-Baseline Neutrino Experiments
• The Sensitivity of DUNE in Presence of Off-Diagonal Scalar NSI Parameters