Abstract
With the recent measurement of reactor mixing angleθ13the knowledge of neutrino oscillation parameters has improved significantly except the CP violating phaseδCP, mass hierarchy, and the octant of the atmospheric mixing angleθ23. Many dedicated experiments are proposed to determine these parameters which may take at least 10 years from now to become operational. It is therefore very crucial to use the results from the existing experiments to see whether we can get even partial answers to these questions. In this paper we study the discovery potential of the ongoing NOνA and T2K experiments as well as the forthcoming T2HK experiment in addressing these questions. In particular, we evaluate the sensitivity of NOνA to determine neutrino mass hierarchy, octant degeneracy, andδCPafter running for its scheduled period of 3 years in neutrino mode and 3 years in antineutrino mode. We then extend the analysis to understand the discovery potential if the experiments will run for (5ν+5ν¯) years and (7ν+3ν¯) years. We also show how the sensitivity improves when we combine the data from NOνA, T2K, and T2HK experiments with different combinations of run period. The CP violation sensitivity is marginal for T2K and NOνA experiments even for ten-year data taking of NOνA. T2HK has a significance above5σfor a fraction of two-fifths values of theδCPspace. We also find thatδCPcan be determined to be better than 35°, 21°, and 9° for all values ofδCPfor T2K, NOνA, and T2HK respectively.
Highlights
The discovery of neutrino oscillations has firmly established that neutrinos are massive
The neutrino oscillation data accumulated over many years allows us to determine the solar and atmospheric neutrino oscillation parameters with very high precision
3σ range 0.278 → 0.375 0.392 → 0.643 0.403 → 0.640 0.0177 → 0.0294 0.0183 → 0.0297 7.11 → 8.18 2.30 → 2.65 2.20 → 2.54. With these exciting discoveries of nonzero θ13 and nonmaximal θ23, the focus of neutrino oscillation studies has been shifted towards the determination of other unknown parameters. These include the determination of mass hierarchy, octant of the atmospheric mixing angle θ23, discovery of CP violation, and the magnitude of the CP violating phase δCP
Summary
The discovery of neutrino oscillations has firmly established that neutrinos are massive. Another important discovery in recent times is the precision measurement of sin2θ23 by MINOS experiment [18], which is found to be nonmaximal. With these exciting discoveries of nonzero θ13 and nonmaximal θ23, the focus of neutrino oscillation studies has been shifted towards the determination of other unknown parameters These include the determination of mass hierarchy, octant of the atmospheric mixing angle θ23, discovery of CP violation, and the magnitude of the CP violating phase δCP. It has the same baseline and off-axis angle as T2K experiment It uses J-PARC’s neutrino experimental facilities with an improved beam power (7.5 MW) and 1 Mt volume water Cherenkov detector, HyperKamiokande (Hyper-K).
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