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arXiv · 2511.17350

Search for New Physics via Low-Energy Electron Recoils with a 4.2 Tonne\times Year Exposure from the LZ Experiment

D. S. Akerib·A. K. Al Musalhi·F. Alder·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·K. Beattie·T. 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·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. 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·A. Fan·N. M. Fearon·N. Fieldhouse·S. Fiorucci·H. Flaecher·E. D. Fraser·T. M. A. Fruth·R. J. Gaitskell·A. Geffre·J. Genovesi·C. Ghag·A. Ghosh·R. Gibbons·S. Gokhale·J. Green·M. G. D. van der Grinten·J. J. Haiston·C. R. Hall·T. Hall·E. Hartigan-O'Connor·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·J. Kingston·D. Kodroff·E. V. Korolkova·H. Kraus·S. Kravitz·L. Kreczko·V. A. Kudryavtsev·C. Lawes·D. S. Leonard·K. T. Lesko
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Abstract

We report results from searches for new physics models through electron recoils using data collected by the LUX-ZEPLIN (LZ) experiment during its first two science runs, with a total exposure of 4.2 tonne-years. The observed data are consistent with a background-only hypothesis. Constraints are derived for electromagnetic interactions of solar neutrinos, solar axion-like particles (ALPs), mirror dark matter, and the absorption of bosonic dark matter candidates. The inverse Primakoff process for 57Fe de-excitation solar ALPs is considered for the first time. These results represent the most stringent constraints to date on keV-scale Primakoff and 57Fe solar ALPs, bosonic dark matter, mirror dark matter, and neutrino millicharge, while remaining competitive for the other signal models investigated.

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D. S. Akerib, A. K. Al Musalhi, F. Alder, 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, K. Beattie, T. 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, 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. 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, A. Fan, N. M. Fearon, N. Fieldhouse, S. Fiorucci, H. Flaecher, E. D. Fraser, T. M. A. Fruth, R. J. Gaitskell, A. Geffre, J. Genovesi, C. Ghag, A. Ghosh, R. Gibbons, S. Gokhale, J. Green, M. G. D. van der Grinten, J. J. Haiston, C. R. Hall, T. Hall, E. Hartigan-O'Connor, 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, J. Kingston, D. Kodroff, E. V. Korolkova, H. Kraus, S. Kravitz, L. Kreczko, V. A. Kudryavtsev, C. Lawes, D. S. Leonard, K. T. Lesko. 2025-11-21. Search for New Physics via Low-Energy Electron Recoils with a 4.2 Tonne\times Year Exposure from the LZ Experiment. https://doi.org/10.1103/wnxl-yf95

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