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Title: Search for a Sub-eV Sterile Neutrino Using Daya Bay’s Full Dataset

Journal Article · · Physical Review Letters
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  1. Sun Yat-Sen University (Zhongshan), Guangzhou (China); Daya Bay Collaboration. et al.
  2. Sun Yat-Sen (Zhongshan) University
  3. University of Wisconsin
  4. Brookhaven National Laboratory
  5. National Taiwan University
  6. Institute of High Energy Physics
  7. Institute of High Energy Physics; Institute of High Energy Physics
  8. National United University
  9. Tsinghua University
  10. Shenzhen University; Sun Yat-Sen (Zhongshan) University
  11. North China Electric Power University
  12. Chinese University of Hong Kong
  13. Siena College
  14. University of California
  15. University of Science and Technology of China
  16. Shandong University
  17. Charles University
  18. Joint Institute for Nuclear Research
  19. University of Illinois at Urbana-Champaign
  20. Lawrence Berkeley National Laboratory
  21. Illinois Institute of Technology
  22. Beijing Normal University
  23. Xi’an Jiaotong University
  24. Yale University
  25. China Institute of Atomic Energy
  26. Guangxi University
  27. Center for Neutrino Physics
  28. National Chiao-Tung University
  29. University of Cincinnati
  30. Temple University
  31. Dongguan University of Technology
  32. The University of Hong Kong
  33. Nanjing University
  34. Nankai University
  35. Shanghai Jiao Tong University
  36. Princeton University
  37. University of California; Lawrence Berkeley National Laboratory; The Hong Kong University of Science and Technology
  38. California Institute of Technology; College of William and Mary
  39. University of California; Lawrence Berkeley National Laboratory
  40. China General Nuclear Power Group
  41. National University of Defense Technology
  42. Iowa State University
  43. Chongqing University
+ Show Author Affiliations

This Letter presents results of a search for the mixing of a sub-eV sterile neutrino with three active neutrinos based on the full data sample of the Daya Bay Reactor Neutrino Experiment, collected during 3158 days of detector operation, which contains 5.55 × 106 reactor $$\overline{v}$$e candidates identified as inverse beta-decay interactions followed by neutron capture on gadolinium. The analysis benefits from a doubling of the statistics of our previous result and from improvements of several important systematic uncertainties. No significant oscillation due to mixing of a sub-eV sterile neutrino with active neutrinos was found. Exclusion limits are set by both Feldman-Cousins and CLs methods. Light sterile neutrino mixing with sin2⁡2⁢θ14 ≳ 0.01 can be excluded at 95% confidence level in the region of 0.01 eV2 ≲ |Δ⁢$$m$$$^{2}_{41}$$| ≲ 0.1 eV2. This result represents the world-leading constraints in the region of 2 × 10–4 eV2 ≲ |Δ⁢$$m$$$^{2}_{41}$$| ≲ 0.2 eV2.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); University of California, Irvine, CA (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC), High Energy Physics (HEP)
Contributing Organization:
Daya Bay Collaboration
Grant/Contract Number:
AC02-05CH11231; SC0009920; SC0012704
OSTI ID:
2406982
Report Number(s):
BNL--225988-2024-JAAM
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 5 Vol. 133; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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