Sensitivities and synergies of DUNE and T2HK

TL;DR

This paper evaluates the combined potential of DUNE and T2HK neutrino experiments for precise measurement of leptonic mixing parameters, emphasizing the importance of experimental complementarity and optimization of global neutrino oscillation efforts.

Contribution

It provides a comprehensive analysis of the sensitivities and synergies between DUNE and T2HK, including recent experimental data and alternative design options, to optimize future neutrino oscillation studies.

Findings

Combined experiments improve parameter precision.

Distinct designs offer complementary insights.

Optimized configurations enhance physics reach.

Abstract

Long-baseline neutrino oscillation experiments, in particular Deep Underground Neutrino Experiment (DUNE) and Tokai to Hyper-Kamiokande (T2HK), will lead the effort in the precision determination of the as yet unknown parameters of the leptonic mixing matrix. In this article, we revisit the potential of DUNE, T2HK and their combination in light of the most recent experimental information. As well as addressing more conventional questions, we pay particular attention to the attainable precision on {\delta}, which is playing an increasingly important role in the physics case of the long-baseline programme. We analyse the complementarity of the two designs, identify the benefit of a programme comprising distinct experiments and consider how best to optimise the global oscillation programme. This latter question is particularly pertinent in light of a number of alternative design options which have recently been mooted: a Korean second detector for T2HK and different beams options at DUNE. We study the impact of these options and quantify the synergies between alternative proposals, identifying the best means of furthering our knowledge of the fundamental physics of neutrino oscillation.