Search for neutron decay into an antineutrino and a neutral kaon in 0.401 megaton-years exposure of Super-Kamiokande

2025/06/17 by Kamiokande Collaboration, Yamauchi, K., Abe, K. +261
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex)

paper · doi:10.48550/arxiv.2506.14406

Abstract

We searched for bound neutron decay via n→ν+K⁰ predicted by the Grand Unified Theories in 0.401 Mton⋅years exposure of all pure water phases in the Super-Kamiokande detector. About 4.4 times more data than in the previous search have been analyzed by a new method including a spectrum fit to kaon invariant mass distributions. No significant data excess has been observed in the signal regions. As a result of this analysis, we set a lower limit of 7.8×10³² years on the neutron lifetime at a 90% confidence level.

Citations

• Review of Particle Physics
• Unity of All Elementary-Particle Forces

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