利用LUX-ZEPLIN（LZ）实验在扩展的核反冲能量窗口中寻找暗物质粒子的相互作用

Search for dark matter particle interactions in an extended nuclear recoil energy window with the LUX-ZEPLIN (LZ) experiment

D. S. Akerib, A. K. Al Musalhi, B. J. Almquist, C. S. Amarasinghe, A. Ames, T. Anderson, N. Angelides, H. M. Araújo, J. E. Armstrong, M. Arthurs, A. Baker, S. Balashov, J. Bang, J. W. Bargemann, E. E. Barillier, D. Bauer, K. Beattie, A. Beauchene, T. L. Benson, A. Bhatti, T. P. Biesiadzinski, H. J. Birch, E. Bishop, G. M. Blockinger, B. Boxer, C. A. J. Brew, P. Brás, S. Burdin, M. C. Carmona-Benitez, M. Carter, A. Chawla, J. J. Cherwinka, Y. T. Chin, S. Contreras, M. V. Converse, R. Coronel, A. Cottle, C. Coulson, G. Cox, C. E. Dahl, I. Darlington, S. Dave, J. Delgaudio, S. Desai, 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. 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, T. Horoho, D. Q. Huang, W. Hulse, D. Hunt, E. Jacquet, R. S. James, K. R. Jenkins, A. C. Kaboth, A. C. Kamaha, D. Khaitan, A. Khazov, J. Kim, Y. D. Kim, D. Kodroff, Q. C. Kong, E. V. Korolkova, H. Kraus, S. Kravitz, L. Kreczko, V. A. Kudryavtsev, C. Lawes, E. B. Leon, D. S. Leonard, K. T. Lesko, C. Levy, Z. Li, J. Lin, A. Lindote, W. H. Lippincott, J. Long, M. I. Lopes, W. Lorenzon, C. Lu, 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, B. Mitra, E. Mizrachi, M. E. Monzani, K. Morå, E. Morrison, B. J. Mount, J. Munski, 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, S. J. Patton, B. Penning, G. Pereira, R. Peres, E. Perry, T. Pershing, A. Piepke, S. S. Poudel, Y. Qie, J. Reichenbacher, G. R. C. Rischbieter, E. Ritchey, H. S. Riyat, R. Rosero, N. J. Rowe, T. Rushton, D. Rynders, S. Saltão, I. Sargeant, A. B. M. R. Sazzad, R. W. Schnee, G. Sehr, M. Severson B. Shafer, S. Shaw, L. Sherman, K. Shi, T. Shutt, C. Silva, G. Sinev, J. Siniscalco, A. M. Softley-Brown, V. N. Solovov, P. Sorensen, J. Soria, T. J. Sumner, M. Szydagis, C. F. Tang, K. Thieme, D. R. Tiedt, D. R. Tovey, J. Tranter, M. Trask, K. Trengove, B. Twigg, A. Usón, A. C. Vaitkus, O. Valentino, A. Wang, J. J. Wang, Y. Wang, L. Weeldreyer, T. J. Whitis, K. Wild, M. Williams, J. Winnicki, M. S. Witherell, 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, H. D. Zenger, W. Zha, H. Zhang, T. Zhang, Y. Zhou

arXiv 2609.02823首次发表：2026-09-03更新：2026-09-03

发表机构

SLAC National Accelerator Laboratory; Kavli Institute for Particle Astrophysics and Cosmology, Stanford University; University College London (UCL); Brown University; University of California, Santa Barbara; Lawrence Berkeley National Laboratory (LBNL); University of Zurich; Imperial College London; STFC Rutherford Appleton Laboratory (RAL); University of Maryland; King’s College London（斯坦福直线加速器中心; 斯坦福大学卡弗里粒子天体物理与宇宙学研究所; 伦敦大学学院; 布朗大学; 加州大学圣塔芭芭拉分校; 劳伦斯伯克利国家实验室; 苏黎世大学; 帝国理工学院; 英国科学与技术设施委员会卢瑟福阿普尔顿实验室; 马里兰大学; 伦敦国王学院）

机构由 AI 辅助整理，请以论文原文为准。

AI 中文总结

利用LUX-ZEPLIN实验在2.84吨·年曝光量下，通过扩展至270 keV的核反冲能量窗口搜寻暗物质粒子相互作用，观测到1个符合248±23±23 keV核反冲的事件，与仅本底假设存在2.6σ全局显著性张力。

AI 中文摘要

我们利用LUX-ZEPLIN（LZ）实验，在2.84吨·年的曝光量下，报告了暗物质粒子与氙核相互作用的搜寻结果。扩展的核反冲能量窗口可达约270 keV，这使得我们能够搜寻有效场论和非弹性暗物质模型，在这些模型中，高能反冲在预测的反冲谱中所占比例比名义上的自旋无关相互作用更大。我们观测到一个事件，其特征与248±23（统计）±23（系统）keV的核反冲一致，位于已知本底预期较低的区域。当考虑别处寻找效应时，轮廓似然比检验发现与仅本底假设存在2.6σ的全局显著性张力，在所测试的模型中最大局域显著性为3.4σ。我们描述了该分析与感兴趣的事件、统计推断中使用的本底模型，并详细说明了所考虑的几种稀有本底拓扑结构。

英文摘要

We report on a search for dark matter particles interacting with xenon nuclei in an exposure of 2.84 tonne-years with the LUX-ZEPLIN (LZ) experiment. An extended nuclear recoil energy window up to approximately 270 keV enables searches for effective field theory and inelastic models of dark matter where high-energy recoils account for a larger fraction of the predicted recoil spectrum compared to the nominal spin independent interaction. We observe one event with characteristics consistent with a nuclear recoil of $248\pm23\,\mathrm{(stat)}\pm23\,\mathrm{(sys)}$ keV, in a region where the known background expectation is low. A profile likelihood ratio test finds tension with the background-only hypothesis at a global significance of 2.6$σ$ when accounting for look-elsewhere effects, with a maximum local significance of 3.4$σ$ across the models tested. We describe the analysis and event of interest, the background model used in the statistical inference, and detail several of the rare background topologies considered.

Comments25 pages including supplemental, 13 figures including supplemental. Data release at https://doi.org/10.17182/hepdata.182472.v1

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