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

2019; American Physical Society; Volume: 99; Issue: 3 Linguagem: Inglês

10.1103/physrevd.99.032008

2470-0037

Mark R. Anderson, S. Andringa, E. Arushanova, S. Asahi, M. Askins, D. J. Auty, H.O. Back, Z. Barnard, N. Barros, D. T. Bartlett, F. Barão, R. Bayes, E. W. Beier, A. Białek, S. D. Biller, E. Blücher, R. Bonventre, M. G. Boulay, D. Braid, E. Caden, E. J. Callaghan, J. Caravaca Rodríguez, J. Carvalho, Luca Cavalli, D. Chauhan, M. Chen, O. Chkvorets, Kenneth Clark, B. T. Cleveland, C. Connors, I. T. Coulter, David Cressy, X. Dai, C. Darrach, B. Davis-Purcell, M. M. Depatie, F. Descamps, F. Di Lodovico, N. Duhaime, F. A. Duncan, Jack Dunger, E. Falk, N. Fatemighomi, V. Fischer, E.R. Fletcher, R. Ford, N. Gagnon, K. Gilje, P. Gorel, K. Graham, C. Grant, J. E. Grove, S. Grullon, E. Guillian, A. L. Hallin, D. Hallman, S. Hans, J. Hartnell, P. J. Harvey, M. Hedayatipour, W. J. Heintzelman, J. Heise, R. L. Helmer, José Luis Hernández, B. Hreljac, Jun Hu, T. Iida, A. S. Inácio, C. M. Jackson, N.A. Jelley, C. Jillings, C. L. Jones, Paul Jones, K. Kamdin, T. Kaptanoglu, J. Kašpar, K. Keeter, C. Kéfélian, P. Khaghani, L. Kippenbrock, J. Klein, R. Knapik, J. Kofron, L. L. Kormos, B. Krar, C. Kraus, C. B. Krauss, T. Kroupová, K. R. Labe, I. Lam, C. Lan, B. J. Land, R. Lane, S. Langrock, A. Latorre, I. Lawson, L. Lebanowski, G. Lefeuvre, Edward J. Leming, A. Li, J. Lidgard, B. Liggins, X. Liu, Y. Liu, V. Lozza, M. Luo, Simon Maguire, A. Maio, K. Majumdar, S. Manecki, J. Maneira, R. D. Martin, E. Marzec, A. Mastbaum, N. McCauley, A. B. McDonald, J. E. McMillan, Pawel Mekarski, M. Meyer, C. Miller, M. Mlejnek, E. Mony, I. Morton-Blake, M. Mottram, S. Nae, M. Nirkko, V. Novikov, H. M. O’Keeffe, Erin O’Sullivan, G. D. Orebi Gann, M. J. Parnell, J. Paton, S. J. M. Peeters, T. Pershing, Z. Petriw, L. Pickard, D. Pracsovics, G. Prior, J. C. Prouty, Sarah Quirk, A. Reichold, R. Richardson, M. Rigan, A. Robertson, J. Rose, R. Rosero, P. M. Rost, J. Rumleskie, M. A. Schumaker, M. H. Schwendener, D. Ścisłowski, J. A. Secrest, M. Seddighin, L. Seguí, S. R. Seibert, I. Semenec, T. Shantz, T. M. Shokair, L. Sibley, J. Sinclair, K. Singh, P. Skensved, T. Sonley, R. Stainforth, M. Strait, M. Stringer, R. Svoboda, A Sörensen, B. Tam, J. Tatar, Liyan Tian, N. Tolich, J. C-L. Tseng, H. Wan Chan Tseung, E. Turner, R. Van Berg, J. G. C. Veinot, C. J. Virtue, B. von Krosigk, E. Vázquez-Jáuregui, J. M. G. Walker, M. Walker, J. Wang, O. Wasalski, J. Waterfield, Jan J. Weigand, Ryan White, J. R. Wilson, T. Winchester, P. Woosaree, A. Wright, Juan Pablo Yáñez, M. Yeh, T. Zhao, Κ. Zuber, A. Zummo,

Nuclear physics research studies

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 $\mathrm{SNO}+$. 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 $2.5\ifmmode\times\else\texttimes\fi{}{10}^{29}\text{ }\text{ }\mathrm{y}$ at 90% Bayesian credibility level (with a prior uniform in rate) for the partial lifetime of the neutron, and $3.6\ifmmode\times\else\texttimes\fi{}{10}^{29}\text{ }\text{ }\mathrm{y}$ 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 $1.3\ifmmode\times\else\texttimes\fi{}{10}^{28}\text{ }\text{ }\mathrm{y}$ for $nn$, $2.6\ifmmode\times\else\texttimes\fi{}{10}^{28}\text{ }\text{ }\mathrm{y}$ for $pn$ and $4.7\ifmmode\times\else\texttimes\fi{}{10}^{28}\text{ }\text{ }\mathrm{y}$ for $pp$, an improvement over existing limits by close to 3 orders of magnitude for the latter two.