 Search for proton decay with an enlarged fiducial volume in Super-Kamiokande I-IV by Super-Kamiokande Collaboration

Full title: Search for proton decay via $p\to e^{+}{\pi }^0$ and $p\to {\mu }^{+}{\pi }^0$ with an enlarged fiducial volume in Super-Kamiokande I-IV. Primary experimental analysis describes the water-detector signatures, event selection and atmospheric-neutrino background.