Neutron-Antineutron Oscillation Search using a 0.37 Megaton$\cdot$Year Exposure of Super-Kamiokande

Abstract

As a baryon number violating process with $\Delta B=2$, neutron-antineutron oscillation ($n\to \bar{n}$) provides a unique test of baryon number conservation. We have performed a search for $n\to \bar{n}$ oscillation with bound neutrons in Super-Kamiokande, with the full data set from its first four run periods, representing an exposure of 0.37~Mton-years. The search used a multivariate analysis trained on simulated $n\to \bar{n}$ events and atmospheric neutrino backgrounds and resulted in 11 candidate events with an expected background of 9.3 events. In the absence of statistically significant excess, we derived a lower limit on $\bar{n}$ appearance lifetime in ${}^{16}$O nuclei of $3.6\times {10}^{32}$ years and on the neutron-antineutron oscillation time of ${\tau }_{n\to \bar{n}}>4.7\times 10^8$~s at 90\% C.L..

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• Dark sectors in neutron-shining-through-a-wall and nuclear absorption signals
• Dark Matter Catalyzed Baryon Destruction
• Matter-antimatter asymmetry and dark matter stability from baryon number conservation
• On the cosmology and terrestrial signals of sexaquark dark matter
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• Spectrum of colour sextet scalars in realistic SO(10) GUT
• A New Model of Intranuclear Neutron-Antineutron Transformations in ${}_8^{16}$O
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• Effective Theory for Baryogenesis with a Majorana Fermion Pair Coupled to Quarks
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• R-parity violation and 8 TeV four-jet events at the LHC
• Effects of Neutron-Antineutron Transitions in Neutron Stars
• Postsphaleron darkogenesis
• Assisted baryon number violation from $4k+2$ dimensions
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• TeV Window to Grand Unification: Higgs's Light Color Triplet Partner