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Search for proton decay via $p \to e^{+} η$ and $p \to μ^{+} η$ with a 0.37 Mton-year exposure of Super-Kamiokande

https://doi.org/10.1103/PhysRevD.110.112011

Taniuchi, N; Abe, K; Abe, S; Asaoka, Y; Bronner, C; Harada, M; Hayato, Y; Hiraide, K; Hosokawa, K; Ieki, K; et al (December 2024, Physical Review D)

A search for proton decay into $e^{+} / μ^{+}$ and a $η$ meson has been performed using data from a $0.373 Mton \cdot year$ exposure (6050.3 live days) of Super-Kamiokande. Compared to previous searches this work introduces an improved model of the intranuclear $η$ interaction cross section, resulting in a factor of 2 reduction in uncertainties from this source and $\sim 10 %$ increase in signal efficiency. No significant data excess was found above the expected number of atmospheric neutrino background events resulting in no indication of proton decay into either mode. Lower limits on the proton partial lifetime of $1.4 \times 10^{34} years$ for $p \to e^{+} η$ and $7.3 \times 10^{33} years$ for $p \to μ^{+} η$ at the 90% CL were set. These limits are around 1.5 times longer than our previous study and are the most stringent to date. Published by the American Physical Society2024
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Free, publicly-accessible full text available December 1, 2025
Search for solar electron anti-neutrinos due to spin-flavor precession in the Sun with Super-Kamiokande-IV

https://doi.org/10.1016/j.astropartphys.2022.102702

Abe, K.; Bronner, C.; Hayato, Y.; Ikeda, M.; Imaizumi, S.; Ito, H.; Kameda, J.; Kataoka, Y.; Miura, M.; Moriyama, S.; et al (June 2022, Astroparticle Physics)

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First gadolinium loading to Super-Kamiokande

https://doi.org/10.1016/j.nima.2021.166248

Abe, K.; Bronner, C.; Hayato, Y.; Hiraide, K.; Ikeda, M.; Imaizumi, S.; Kameda, J.; Kanemura, Y.; Kataoka, Y.; Miki, S.; et al (March 2022, Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment)

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Diffuse supernova neutrino background search at Super-Kamiokande

https://doi.org/10.1103/PhysRevD.104.122002

Abe, K.; Bronner, C.; Hayato, Y.; Hiraide, K.; Ikeda, M.; Imaizumi, S.; Kameda, J.; Kanemura, Y.; Kataoka, Y.; Miki, S.; et al (December 2021, Physical Review D)

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Multi-messenger Observations of a Binary Neutron Star Merger

https://doi.org/10.3847/2041-8213/aa91c9

Abbott, B. P.; Abbott, R.; Abbott, T. D.; Acernese, F.; Ackley, K.; Adams, C.; Adams, T.; Addesso, P.; Adhikari, R. X.; Adya, V. B.; et al (October 2017, The Astrophysical Journal)

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