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Detecting the kaon needs detectors with good tracking.","posed_since":"1982","precise":"Measure or bound tau(p -> anti-nu K+)/B, currently $> \\sim 5.9e33\\,\\mathrm{yr}$ (Super-Kamiokande, 2014). Minimal SUSY $\\mathrm{SU}(5)$ with dimension-5 operators predicts values near or below this; an answer is a detection or a limit $\\sim 1e34\\text{ to }1e35\\,\\mathrm{yr}$.","problem_ref":null,"references":"","settled_by":"DUNE liquid-argon tracking, Hyper-Kamiokande and JUNO searches for p -> anti-nu K+.","status_note":"","title":"Does the proton decay to an antineutrino and a 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