Projected sensitivity of the LUX-ZEPLIN experiment to the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mn>0</mml:mn><mml:mi>ν</mml:mi><mml:mi>β</mml:mi><mml:mi>β</mml:mi></mml:mrow></mml:math> decay of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi>Xe</mml:mi><mml:mprescripts/><mml:none/><mml:mn>136</mml:mn></mml:mmultiscripts></mml:math>
D. S. Akerib, C. Akerlof, A. Alqahtani, S. Alsum, Tyler Anderson, N. Angelides, H. M. Araújo, J. E. Armstrong, M. Arthurs, X. Bai, J. Balajthy, S. Balashov, J. Bang, A. Baxter, J. R. Bensinger, E. P. Bernard, A. Bernstein, A. Bhatti, A. Biekert, T. P. Biesiadzinski, H. J. Birch, K. E. Boast, B. Boxer, P. Brás, J. H. Buckley, V. V. Bugaev, S. Burdin, J.K. Busenitz, R. Cabrita, C. Carels, D. Carlsmith, M. C. Carmona-Benitez, M. Cascella, C. Chan, N. Chott, A. Cole, A. Cottle, J. E. Cutter, C. E. Dahl, L. de Viveiros, J. E. Y. Dobson, E. Druszkiewicz, T. K. Edberg, S. R. Eriksen, A. Fan, S. Fiorucci, H. Flaecher, E. D. Fraser, T. Fruth, R. J. Gaitskell, J. Genovesi, C. Ghag, E. F. Gibson, M. G. D. Gilchriese, S. Gokhale, M. G. D. van der Grinten, C. Hall, Aaron W. Harrison, S. J. Haselschwardt, S. A. Hertel, J. Y-K. Hor, M. Horn, D. Q. Huang, C. M. Ignarra, O. Jahangir, W. Ji, J. Johnson, A. C. Kaboth, A. Kamaha, K. Kamdin, K. Kazkaz, D. Khaitan, A. Khazov, I. Khurana, Charles D. Kocher, L. Korley, E. V. Korolkova, J. Kras, H. Kraus, S. Kravitz, L. Kreczko, B. Krikler, V. A. Kudryavtsev, E. Leason, J. Lee, D. S. Leonard, K. T. Lesko, C. Levy, J. Li, J. Liao, F.-T. Liao, J. Lin, A. Lindote, R. Linehan, W. H. Lippincott, Ruocong Liu, X. Liu, C. Loniewski, I. Lopes, B. López Paredes
Abstract
The LUX-ZEPLIN (LZ) experiment will enable a neutrinoless double $\ensuremath{\beta}$ decay search in parallel to the main science goal of discovering dark matter particle interactions. We report the expected LZ sensitivity to $^{136}\mathrm{Xe}$ neutrinoless double $\ensuremath{\beta}$ decay, taking advantage of the significant ($>600$ kg) $^{136}\mathrm{Xe}$ mass contained within the active volume of LZ without isotopic enrichment. After 1000 live-days, the median exclusion sensitivity to the half-life of $^{136}\mathrm{Xe}$ is projected to be $1.06\ifmmode\times\else\texttimes\fi{}{10}^{26}$ years (90% confidence level), similar to existing constraints. We also report the expected sensitivity of a possible subsequent dedicated exposure using 90% enrichment with $^{136}\mathrm{Xe}$ at $1.06\ifmmode\times\else\texttimes\fi{}{10}^{27}$ years.