Publications by Jeffrey Lidgard

Search for invisible modes of nucleon decay in water with the SNO+ detector

Physical Review D American Physical Society 99 (2019) 032008-

M Anderson, S Andringa, E Arushanova, S Biller, L Cavalli, N Jelley, T Kroupova, E Leming, J Lidgard, I Morton-Blake, J Paton, A Reichold, J Tseng, E Turner, J-S Wang

This paper reports results from a search for nucleon decay through invisible modes, where no visible energy is directly deposited during the decay itself, during the initial water phase of SNO+. However, such decays within the oxygen nucleus would produce an excited daughter that would subsequently deexcite, often emitting detectable gamma rays. A search for such gamma rays yields limits of 2.5×1029  y at 90% Bayesian credibility level (with a prior uniform in rate) for the partial lifetime of the neutron, and 3.6×1029  y for the partial lifetime of the proton, the latter a 70% improvement on the previous limit from SNO. We also present partial lifetime limits for invisible dinucleon modes of 1.3×1028  y for nn, 2.6×1028  y for pn and 4.7×1028  y for pp, an improvement over existing limits by close to 3 orders of magnitude for the latter two.

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