Effect of Matter Density in T2HK and DUNE

TL;DR

This paper evaluates how Earth's density uncertainties affect the ability of T2HK and DUNE experiments to precisely measure the CP phase in neutrino oscillations, highlighting the importance of accounting for matter density in experimental sensitivity.

Contribution

It updates the sensitivity analysis of T2HK and DUNE for CP phase measurement considering Earth's density uncertainties and explores their complementarity.

Findings

Density uncertainty impacts DUNE's CP measurement precision.

DUNE is more affected by density uncertainties than T2HK.

Complementarity between T2HK and DUNE helps mitigate some uncertainties.

Abstract

CP phase determination for the near future long baseline experiments, T2HK and DUNE, will require precise measurements of the oscillation probabilities. However, the uncertainty in the Earth's density must be considered in determining these oscillation probabilities. Therefore, in this study, we update the individual sensitivities of these experiments for determining the current unknowns in the standard three flavor scenario considering the latest configuration and also the complementarity between them while considering the uncertainty in the density. Our study showed that this uncertainty has a non-negligible impact on the precision of the CP phase determination particularly for DUNE.