The possibility to observe the non-standard interaction by the Hyperkamiokande atmospheric neutrino experiment

TL;DR

This paper explores the potential of the Hyper-Kamiokande atmospheric neutrino experiment to detect non-standard flavor-dependent interactions in neutrino propagation, which could resolve existing tensions in neutrino oscillation data.

Contribution

It demonstrates that Hyper-Kamiokande can test the non-standard interaction hypothesis with high statistical significance, assuming the neutrino mass hierarchy is known.

Findings

Best-fit value from solar and KamLAND data can be tested at >8σ

Global analysis can be examined at 5.0σ (normal hierarchy)

Inverted hierarchy can be tested at 1.4σ

Abstract

It was suggested that a tension between the mass-squared differences obtained from the solar neutrino and KamLAND experiments can be solved by introducing the non-standard flavor-dependent interaction in neutrino propagation. In this paper we discuss the possibility to test such a hypothesis by atmospheric neutrino observations at the future Hyper-Kamiokande experiment. Assuming that the mass hierarchy is known, we find that the best-fit value from the solar neutrino and KamLAND data can be tested at more than 8 $\sigma$, while the one from the global analysis can be examined at 5.0 $\sigma$ (1.4 $\sigma$) for the normal (inverted) mass hierarchy.