Correction to: Nature https://doi.org/10.1038/s41586-021-03256-1Published online 10 March 2021

In this Article, owing to an error in the production process, the affiliation of author L. Lu was incorrectly shown as ‘Karlsruhe Institute of Technology, Institute for Astroparticle Physics, Karlsruhe, Germany’ (affiliation 16) instead of ‘Department of Physics and Institute for Global Prominent Research, Chiba University, Chiba, Japan’ (affiliation 48). The original Article has been corrected online.