Search for proton decay via p→μ+K0 in 0.37 megaton-years exposure of Super-Kamiokande

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Abstract

We searched for proton decay via $p\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}{K}^{0}$ in $0.37\text{ }\text{ }\mathrm{Mton}\ifmmode\cdot\else\textperiodcentered\fi{}\mathrm{years}$ of data collected between 1996 and 2018 from the Super-Kamiokande water Cherenkov experiment. The selection criteria were defined separately for ${K}_{S}^{0}$ and ${K}_{L}^{0}$ channels. No significant event excess has been observed. As a result of this analysis, which extends the previous search by an additional $0.2\text{ }\text{ }\mathrm{Mton}\ifmmode\cdot\else\textperiodcentered\fi{}\mathrm{years}$ of exposure and uses an improved event reconstruction, we set a lower limit of $3.6\ifmmode\times\else\texttimes\fi{}{10}^{33}\text{ }\text{ }\mathrm{years}$ on the proton lifetime.

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