Search for Nucleon and Dinucleon Decays with an Invisible Particle and a Charged Lepton in the Final State at the Super-Kamiokande Experiment

Le résumé fourni par la source

Search results for nucleon decays $p\ensuremath{\rightarrow}{e}^{+}X$, $p\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}X$, $n\ensuremath{\rightarrow}\ensuremath{\nu}\ensuremath{\gamma}$ (where $X$ is an invisible, massless particle) as well as dinucleon decays $np\ensuremath{\rightarrow}{e}^{+}\ensuremath{\nu}$, $np\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}\ensuremath{\nu}$, and $np\ensuremath{\rightarrow}{\ensuremath{\tau}}^{+}\ensuremath{\nu}$ in the Super-Kamiokande experiment are presented. Using single-ring data from an exposure of $\text{ }273.4\text{ }\text{ }\mathrm{kton}\ifmmode\cdot\else\textperiodcentered\fi{}\mathrm{yr}$, a search for these decays yields a result consistent with no signal. Accordingly, lower limits on the partial lifetimes of ${\ensuremath{\tau}}_{p\ensuremath{\rightarrow}{e}^{+}X}>7.9\ifmmode\times\else\texttimes\fi{}{10}^{32}\text{ }\text{ }\mathrm{yr}$, ${\ensuremath{\tau}}_{p\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}X}>4.1\ifmmode\times\else\texttimes\fi{}{10}^{32}\text{ }\text{ }\mathrm{yr}$, ${\ensuremath{\tau}}_{n\ensuremath{\rightarrow}\ensuremath{\nu}\ensuremath{\gamma}}>5.5\ifmmode\times\else\texttimes\fi{}{10}^{32}\text{ }\text{ }\mathrm{yr}$, ${\ensuremath{\tau}}_{np\ensuremath{\rightarrow}{e}^{+}\ensuremath{\nu}}>2.6\ifmmode\times\else\texttimes\fi{}{10}^{32}\text{ }\text{ }\mathrm{yr}$, ${\ensuremath{\tau}}_{np\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}\ensuremath{\nu}}>2.2\ifmmode\times\else\texttimes\fi{}{10}^{32}\text{ }\text{ }\mathrm{yr}$, and ${\ensuremath{\tau}}_{np\ensuremath{\rightarrow}{\ensuremath{\tau}}^{+}\ensuremath{\nu}}>2.9\ifmmode\times\else\texttimes\fi{}{10}^{31}\text{ }\text{ }\mathrm{yr}$ at a 90% confidence level are obtained. Some of these searches are novel.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.