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PreprintCC BY-NC-SA 4.0arXiv

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

  • D. S. Akerib1,2
  • A. K. Al Musalhi
  • B. J. Almquist3
  • C. S. Amarasinghe4
  • A. Ames1,2
  • Tyler Anderson5
  • N. Angelides6
  • H M Araújo7,8
  • J. E. Armstrong9
  • M. Arthurs1,2
  • A. Baker10
  • S. Balashov8
88 more authors
  • J. Bang3
  • J. W. Bargemann4
  • E. E. Barillier6
  • Daniela U. Bauer7
  • K. Beattie5
  • A Beauchêne11
  • T. Benson12
  • A. Bhatti9
  • Tomasz P. Biesiadzinski1,2
  • H. J. Birch6
  • E. Bishop13
  • G. M. Blockinger14
  • B. Boxer15
  • C. Brew8
  • P. Brás16
  • Sergey V. Burdin17
  • M. C. Carmona-Benitez18
  • M. Carter17
  • A. Chawla19
  • J. J. Cherwinka12
  • Y. T. Chin18
  • S. Contreras20
  • M. V. Converse21
  • R. Coronel1,2
  • A. Cottle22
  • C. Coulson23
  • G. A. Cox24
  • C. E. Dahl25,23
  • I. Darlington22
  • S. Dave22
  • J. Delgaudio24
  • S. Desai20
  • S. Dey11
  • L. de Viveiros18
  • L. Di Felice
  • C. Ding3
  • J. E. Y. Dobson10
  • E. Druszkiewicz21
  • S. Dubey3
  • C. L. Dunbar24
  • S. R. Eriksen26
  • S. Fayer7
  • N. Fieldhouse11
  • S. Fiorucci5
  • Henning U Flaecher26
  • E. D. Fraser17
  • T. Fruth27
  • P. Gaemers1,2

60 listed; 100 in total.

27 affiliations
  1. 1Kavli Institute for Particle Astrophysics and Cosmology , Stanford University , Stanford , CA 94305-4085 USA
  2. 2SLAC National Accelerator Laboratory , Menlo Park , CA 94025-7015 , USA
  3. 3Brown University , Department of Physics , Providence , RI 02912-9037 , USA
  4. 4University of California , Santa Barbara , Department of Physics , Santa Barbara , CA 93106-9530 , USA
  5. 5Lawrence Berkeley National Laboratory (LBNL) , Berkeley , CA 94720-8099 , USA
  6. 6University of Zurich , Department of Physics , 8057 Zurich , Switzerland
  7. 7Imperial College London , Physics Department , Blackett Laboratory , London SW7 2AZ , UK
  8. 8STFC Rutherford Appleton Laboratory (RAL) , Didcot , OX11 0QX , UK
  9. 9University of Maryland , Department of Physics , College Park , MD 20742-4111 , USA
  10. 10King's College London , Department of Physics , London WC2R 2LS , UK
  11. 11University of Oxford , Department of Physics , Oxford OX1 3RH , UK
  12. 12University of Wisconsin-Madison , Physical Sciences Laboratory , Stoughton , WI 53589-3034 , USA
  13. 13University of Edinburgh , School of Physics and Astronomy , Edinburgh EH9 3FD , UK
  14. 14University at Albany (SUNY) , Department of Physics , Albany , NY 12222-0100 , USA
  15. 15University of California , Davis , Department of Physics , Davis , CA 95616-5270 , USA
  16. 16Laboratório de Instrumentação e Física Experimental de Partículas (LIP) , Department of Physics , University of Coimbra , P-3004 516 Coimbra , Portugal
  17. 17University of Liverpool , Department of Physics , Liverpool L69 7ZE , UK
  18. 18Pennsylvania State University , Department of Physics , University Park , PA 16802-6300 , USA
  19. 19Royal Holloway , University of London , Department of Physics , Egham , TW20 0EX , UK
  20. 20University of California , Los Angeles , Department of Physics & Astronomy , Los Angeles , CA 90095-1547
  21. 21University of Rochester , Department of Physics and Astronomy , Rochester , NY 14627-0171 , USA
  22. 22University College London (UCL) , Department of Physics and Astronomy , London WC1E 6BT , UK
  23. 23Northwestern University , Department of Physics & Astronomy , Evanston , IL 60208-3112 , USA
  24. 24South Dakota Science and Technology Authority (SDSTA) , Sanford Underground Research Facility , Lead , SD 57754-1700 , USA
  25. 25Fermi National Accelerator Laboratory (FNAL) , Batavia , IL 60510-5011 , USA
  26. 26University of Bristol , H.H. Wills Physics Laboratory , Bristol , BS8 1TL , UK
  27. 27The University of Sydney , School of Physics , Physics Road , Camperdown , Sydney , NSW 2006 , Australia
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Abstract

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±23 (stat)±23 (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 2.6σ when accounting for look-elsewhere effects, with a maximum local significance of 3.4σ 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.

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Cite

BibTeXRIS
BibTeX
@misc{akerib2026search,
  title = {{Search for dark matter particle interactions in an extended nuclear recoil energy window with the LUX-ZEPLIN (LZ) experiment}},
  author = {D. S. Akerib and A. K. Al Musalhi and B. J. Almquist and C. S. Amarasinghe and A. Ames and Tyler Anderson and N. Angelides and H M Araújo and J. E. Armstrong and M. Arthurs and A. Baker and S. Balashov and J. Bang and J. W. Bargemann and E. E. Barillier and Daniela U. Bauer and K. Beattie and A Beauchêne and T. Benson and A. Bhatti and Tomasz P. Biesiadzinski and H. J. Birch and E. Bishop and G. M. Blockinger and B. Boxer and C. Brew and P. Brás and Sergey V. Burdin and M. C. Carmona-Benitez and M. Carter and A. Chawla and J. J. Cherwinka and Y. T. Chin and S. Contreras and M. V. Converse and R. Coronel and A. Cottle and C. Coulson and G. A. Cox and C. E. Dahl and I. Darlington and S. Dave and J. Delgaudio and S. Desai and S. Dey and L. de Viveiros and L. Di Felice and C. Ding and J. E. Y. Dobson and E. Druszkiewicz and S. Dubey and C. L. Dunbar and S. R. Eriksen and S. Fayer and N. Fieldhouse and S. Fiorucci and Henning U Flaecher and E. D. Fraser and T. Fruth and P. Gaemers},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.02823},
  eprint = {2609.02823},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.02823},
  note = {CC BY-NC-SA 4.0},
}
RIS
TY  - UNPB
TI  - Search for dark matter particle interactions in an extended nuclear recoil energy window with the LUX-ZEPLIN (LZ) experiment
AU  - D. S. Akerib
AU  - A. K. Al Musalhi
AU  - B. J. Almquist
AU  - C. S. Amarasinghe
AU  - A. Ames
AU  - Tyler Anderson
AU  - N. Angelides
AU  - H M Araújo
AU  - J. E. Armstrong
AU  - M. Arthurs
AU  - A. Baker
AU  - S. Balashov
AU  - J. Bang
AU  - J. W. Bargemann
AU  - E. E. Barillier
AU  - Daniela U. Bauer
AU  - K. Beattie
AU  - A Beauchêne
AU  - T. Benson
AU  - A. Bhatti
AU  - Tomasz P. Biesiadzinski
AU  - H. J. Birch
AU  - E. Bishop
AU  - G. M. Blockinger
AU  - B. Boxer
AU  - C. Brew
AU  - P. Brás
AU  - Sergey V. Burdin
AU  - M. C. Carmona-Benitez
AU  - M. Carter
AU  - A. Chawla
AU  - J. J. Cherwinka
AU  - Y. T. Chin
AU  - S. Contreras
AU  - M. V. Converse
AU  - R. Coronel
AU  - A. Cottle
AU  - C. Coulson
AU  - G. A. Cox
AU  - C. E. Dahl
AU  - I. Darlington
AU  - S. Dave
AU  - J. Delgaudio
AU  - S. Desai
AU  - S. Dey
AU  - L. de Viveiros
AU  - L. Di Felice
AU  - C. Ding
AU  - J. E. Y. Dobson
AU  - E. Druszkiewicz
AU  - S. Dubey
AU  - C. L. Dunbar
AU  - S. R. Eriksen
AU  - S. Fayer
AU  - N. Fieldhouse
AU  - S. Fiorucci
AU  - Henning U Flaecher
AU  - E. D. Fraser
AU  - T. Fruth
AU  - P. Gaemers
PY  - 2026
DA  - 2026/09/02
PB  - arXiv
DO  - 10.48550/arxiv.2609.02823
UR  - https://arxiv.org/abs/2609.02823
AB  - 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±23 (stat)±23 (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 2.6σ when accounting for look-elsewhere effects, with a maximum local significance of 3.4σ 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.
SN  - 2331-8422
ER  -