On the impact of systematical uncertainties for the CP violation measurement in superbeam experiments

Abstract

Superbeam experiments can, in principle, achieve impressive sensitivities for CP violation in neutrino oscillations for large ${\theta }_{13}$. We study how those sensitivities depend on assumptions about systematical uncertainties. We focus on the second phase of T2K, the so-called T2HK experiment, and we explicitly include a near detector in the analysis. Our main result is that even an idealised near detector cannot remove the dependence on systematical uncertainties completely. Thus additional information is required. We identify certain combinations of uncertainties, which are the key to improve the sensitivity to CP violation, for example the ratio of electron to muon neutrino cross sections and efficiencies. For uncertainties on this ratio larger than 2%, T2HK is systematics dominated. We briefly discuss how our results apply to a possible two far detector configuration, called T2KK. We do not find a significant advantage with respect to the reduction of systematical errors for the measurement of CP violation for this setup.

30 pages, 10 figures, version accepted for publication in JHEP

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• Cross Section Measurements with Monoenergetic Muon Neutrinos
• Revisiting the sensitivity studies for leptonic CP violation and mass hierarchy with T2K, NOvA and LBNE experiments
• Neutrino Tagging, a new tool for accelerator based neutrino experiments
• A comparative study of long-baseline superbeams within LAGUNA for large ${\theta }_{13}$
• First detection of a tagged neutrino in the NA62 experiment
• Influence of cross-sectional uncertainty on sensitivity studies of DUNE and T2HK experiments
• Prospects for neutrino oscillation parameters
• A New Generation of Neutrino Cross Section Experiments: Challenges and Opportunities
• Impact of unitarity violation on sensitivity of the leptonic CP phase at Hyper-Kamiokande and DUNE
• Flavour Symmetry Embedded -- GLoBES (FaSE-GLoBES)