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LZ is a 10-tonne xenon time projection chamber optimized for the detection of dark matter particles, that is expected to start operating in 2021 at Sanford Underground Research Facility, USA. Its large mass of natural xenon provides an exceptional opportunity to search for the double beta decay of $^{134}$Xe, for which xenon detectors enriched in $^{136}$Xe are less effective. For the two-neutrino decay mode, LZ is predicted to exclude values of the half-li","authors_text":"A. Ames, A. Baxter, A. Bernstein, A. Bhatti, A. Biekert, A. B. M. R. Sazzad, A. C. Kaboth, A. C. Kamaha, A. Cole, A. Cottle, A. Fan, A. K. Al Musalhi, A. Khazov, A. Lindote, A. Manalaysay, A. Monte, A. Naylor, A. Nilima, A. Piepke, A. Richards, A. Stevens, A. St. J. Murphy, A. Vaitkus, B. Boxer, B. J. Mount, B. Krikler, B. Lopez Paredes, B. Penning, B. Suerfu, B. Wang, C. A. J. Brew, C. A. Rhyne, C. B. Gwilliam, C. Chan, C. E. Dahl, C. Ghag, C. J. Wright, C. Levy, C. M. Ignarra, C. Nedlik, C. R. Hall, C. S. Amarasinghe, C. Silva, D. Bauer, D. J. Temples, D. Khaitan, D. Kodroff, D. Naim, D. N. McKinsey, D. Q. Huang, D. R. Tiedt, D. R. Tovey, D. R. Tronstad, D. Santone, D. S. Leonard, D. Woodward, E. A. Leason, E. Bodnia, E. D. Fraser, E. Druszkiewicz, E. Gibson, E. H. Miller, E. K. Pease, E. Lopez Asamar, E. Mizrachi, E. Morrison, E. P. Bernard, E. V. Korolkova, F. L. H. Wolfs, F. Neves, G. Cox, G. M. Blockinger, G. Pereira, G. R. C. Rischbieter, H. Flaecher, H. J. Birch, H. Kraus, H. M. Araujo, H. N. Nelson, I. Khurana, I. Olcina, I. Stancu, J. A. Morad, J. A. Nikoleyczik, J. Balajthy, J. Bang, J. D. Morales Mendoza, J. E. Armstrong, J. E. Cutter, J. E. Y. Dobson, J. Genovesi, J. Johnson, J. J. Silk, J. J. Wang, J. K. Busenitz, J. Lee, J. Liao, J. Lin, J. Mclaughlin, J. Palmer, J. Reichenbacher, J. R. Watson, J. Soria, J. W. Bargemann, J. Xu, K. C. Oliver-Mallory, K. J. Palladino, K. Kamdin, K. Kazkaz, K. Stifter, K. T. Lesko, L. de Viveiros, L. Korley, L. Kreczko, L. Manenti, M. Arthurs, M. Buuck, M. Cascella, M. C. Carmona-Benitez, M. E. McCarthy, M. E. Monzani, M. G. D. van der Grinten, M. Horn, M. I. Lopes, M. Solmaz, M. Szydagis, M. Timalsina, M. Tripathi, M. V. Converse, M. Williams, M. Yeh, N. Angelides, N. I. Chott, N. Marangou, N. M. Fearon, N. Parveen, N. Swanson, O. Creaner, O. Jahangir, P. A. Majewski, P. A. Terman, P. Beltrame, P. Bras, P. Rossiter, P. R. Scovell, P. Sorensen, P. Zarzhitsky, Q. Riffard, R. Cabrita, R. C. Webb, R. G. White, R. J. Gaitskell, R. Linehan, R. L. Mannino, R. Rosero, R. S. James, R. Smith, R. Taylor, R. W. Schnee, S. A. Hertel, S. Balashov, S. Burdin, S. Fayer, S. Fiorucci, S. Gokhale, S. J. Haselschwardt, S. K. Alsum, S. Kravitz, S. Luitz, S. Pal, S. Patton, S. R. Eriksen, S. Shaw, T. A. Shutt, T. Fruth, The LUX-ZEPLIN (LZ) Collaboration: D. S. Akerib, T. J. Anderson, T. J. Sumner, T. J. Whitis, T. P. Biesiadzinski, U. Utku, V. A. Kudryavtsev, V. N. Solovov, W. C. Taylor, W. H. Lippincott, W. H. To, W. Ji, W. 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