Search for dinucleon decay into pions at Super-Kamiokande

Abstract

A search for dinucleon decay into pions with the Super-Kamiokande detector has been performed with an exposure of 282.1 kiloton-years. Dinucleon decay is a process that violates baryon number by two units. We present the first search for dinucleon decay to pions in a large water Cherenkov detector. The modes ${}^{16}$O$(pp)\to$ ${}^{14}$C${\pi }^{+}{\pi }^{+}$, ${}^{16}$O$(pn)\to$ ${}^{14}$N${\pi }^{+}{\pi }^0$, and ${}^{16}$O$(nn)\to$ ${}^{14}$O${\pi }^0{\pi }^0$ are investigated. No significant excess in the Super-Kamiokande data has been found, so a lower limit on the lifetime of the process per oxygen nucleus is determined. These limits are: ${\tau }_{pp\to {\pi }^{+}{\pi }^{+}}>7.22\times 10^{31}$ years, ${\tau }_{pn\to {\pi }^{+}{\pi }^0}>1.70\times 10^{32}$ years, and ${\tau }_{nn\to {\pi }^0{\pi }^0}>4.04\times 10^{32}$ years. The lower limits on each mode are about two orders of magnitude better than previous limits from searches for dinucleon decay in iron.

arXiv comment20 pages, 17 figures. Accepted for publication in Physical Review D on March 30, 2015

References in corpus (16)

• A Measurement of Atmospheric Neutrino Oscillation Parameters by Super-Kamiokande I
• Calculation of atmospheric neutrino flux using the interaction model calibrated with atmospheric muon data
• Atmospheric neutrino oscillation analysis with sub-leading effects in Super-Kamiokande I, II, and III
• Bounds on $\Delta B=1$ Couplings in the Supersymmetric Standard Model
• Evidence of Electron Neutrino Appearance in a Muon Neutrino Beam
• Calibration of the Super-Kamiokande Detector
• Search for Proton Decay via $p\to \nu K^{+}$ using 260 kiloton$\cdot$year data of Super-Kamiokande
• Simplified models with baryon number violation but no proton decay
• Search for nucleon decay via modes favored by supersymmetric grand unification models in Super-Kamiokande-I
• Search for Nucleon Decay into Charged Anti-lepton plus Meson in Super-Kamiokande I and II
• A Search for Nucleon Decay via $n\to \bar{\nu }{\pi }^0$ and $p\to \bar{\nu }{\pi }^{+}$ in Super-Kamiokande
• High-speed charge-to-time converter ASIC for the Super-Kamiokande detector
• Dynamical R-Parity Violation
• Bounds on $\Delta B=1$ Couplings in the Supersymmetric Standard Model
• Realistic calculations of nuclear disappearance lifetimes induced by neutron-antineutron oscillations
• Search for Proton Decay into Muon plus Neutral Kaon in Super-Kamiokande I, II, and III

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