D S Akerib, A K Al Musalhi, F Alder, B J Almquist, C S Amarasinghe, A Ames, T J Anderson, N Angelides, H M Araújo, J E Armstrong, M Arthurs, A Baker, S Balashov, J Bang, J W Bargemann, E E Barillier, J Barthel, D Bauer, K Beattie, A Bhatti, T P Biesiadzinski, H J Birch, E Bishop, G M Blockinger, C A J Brew, P Brás, S Burdin, M C Carmona-Benitez, M Carter, A Chawla, H Chen, Y T Chin, N I Chott, S Contreras, M V Converse, R Coronel, A Cottle, G Cox, D Curran, C E Dahl, I Darlington, S Dave, A David, J Davis, J Delgaudio, S Dey, L de Viveiros, L Di Felice, C Ding, J E Y Dobson, E Druszkiewicz, S Dubey, C L Dunbar, S R Eriksen, S Fayer, N M Fearon, N Fieldhouse, S Fiorucci, H Flaecher, E D Fraser, T M A Fruth, P W Gaemers, R J Gaitskell, A Geffre, J Genovesi, C Ghag, J Ghamsari, A Ghosh, S Ghosh, R Gibbons, S Gokhale, J Green, M G D van der Grinten, J J Haiston, C R Hall, T Hall, R N Hampp, S J Haselschwardt, M A Hernandez, S A Hertel, G J Homenides, M Horn, D Q Huang, D Hunt, E Jacquet, R S James, K Jenkins, A C Kaboth, A C Kamaha, M K Kannichankandy, D Khaitan, A Khazov, J Kim, Y D Kim, D Kodroff, E V Korolkova, H Kraus, S Kravitz, L Kreczko, V A Kudryavtsev, C Lawes, D S Leonard, K T Lesko, C Levy, J Lin, A Lindote, W H Lippincott, J Long, M I Lopes, W Lorenzon, C Lu, D Lucero, S Luitz, W Ma, V Mahajan, P A Majewski, A Manalaysay, R L Mannino, R J Matheson, C Maupin, M E McCarthy, D N McKinsey, J McLaughlin, J B McLaughlin, R McMonigle, B Mitra, E Mizrachi, M E Monzani, K Morå, E Morrison, B J Mount, M Murdy, A St J Murphy, H N Nelson, F Neves, A Nguyen, C L O'Brien, F H O'Shea, I Olcina, K C Oliver-Mallory, J Orpwood, K Y Oyulmaz, K J Palladino, N J Pannifer, N Parveen, S J Patton, B Penning, G Pereira, E Perry, T Pershing, A Piepke, S S Poudel, Y Qie, J Reichenbacher, C A Rhyne, G R C Rischbieter, E Ritchey, H S Riyat, R Rosero, N J Rowe, T Rushton, D Rynders, S Saltão, D Santone, I Sargeant, A B M R Sazzad, R W Schnee, G Sehr, B Shafer, S Shaw, W Sherman, K Shi, T Shutt, C Silva, G Sinev, J Siniscalco, A M Slivar, R Smith, V N Solovov, P Sorensen, J Soria, T J Sumner, A Swain, M Szydagis, D J Taylor, D R Tiedt, M Timalsina, D R Tovey, J Tranter, M Trask, K Trengove, M Tripathi, A Usón, A C Vaitkus, O Valentino, V Velan, A Wang, J J Wang, Y Wang, L Weeldreyer, T J Whitis, K Wild, M Williams, J Winnicki, L Wolf, F L H Wolfs, S Woodford, D Woodward, C J Wright, Q Xia, J Xu, Y Xu, M Yeh, D Yeum, J Young, W Zha, H Zhang, T Zhang, Y Zhou, LZ Collaboration
We present searches for light dark matter (DM) with masses 3-9 GeV/c^{2} in the presence of coherent elastic neutrino-nucleus scattering (CEνNS) from ^{8}B solar neutrinos with the LUX-ZEPLIN experiment. This analysis uses a 5.7 tonne-yr exposure with data collected between March 2023 and April 2025. In an energy range spanning 1-6 keV, we report no significant excess of events attributable to dark matter nuclear recoils, but we observe a significant signal from ^{8}B CEνNS interactions that is consistent with expectation. We set world-leading limits on spin-independent and spin-dependent-neutron DM-nucleon interactions for masses down to 5 GeV/c^{2}. In the no-dark-matter scenario, we observe a signal consistent with ^{8}B CEνNS events, corresponding to a 4.5σ statistical significance. This is the most significant evidence of ^{8}B CEνNS interactions and is enabled by robust background modeling and mitigation techniques. This demonstrates LZ's ability to detect rare signals at keV-scale energies.