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Searches for CEνNS and Physics beyond the Standard Model using Skipper-CCDs at CONNIE

Journal Article · · TBD
OSTI ID:2468665
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  1. Mexico U., ICN
  2. Centro Atomico Bariloche
  3. ITeDA, Buenos Aires; Rio de Janeiro Federal U.
  4. Fermilab
  5. Mexico U., ICN; Fermilab
  6. Fermilab; Buenos Aires, CONICET; Asuncion Natl. U.
  7. Buenos Aires, CONICET
  8. Unlisted, BR
  9. Rio de Janeiro, CBPF
  10. Fermilab; Buenos Aires, CONICET
  11. CEFET, Rio de Janeiro
  12. Zurich U.
  13. Rio de Janeiro Federal U.
  14. ITeDA, Buenos Aires; Rio de Janeiro, CBPF
  15. Sao Paulo, Inst. Tech. Aeronautics
  16. Asuncion Natl. U.
  17. ABC Federal U.
  18. Buenos Aires U.; Buenos Aires, CONICET
  19. Cordoba U.
+ Show Author Affiliations

The Coherent Neutrino-Nucleus Interaction Experiment (CONNIE) aims to detect the coherent scattering (CE$$\nu$$NS) of reactor antineutrinos off silicon nuclei using thick fully-depleted high-resistivity silicon CCDs. Two Skipper-CCD sensors with sub-electron readout noise capability were installed at the experiment next to the Angra-2 reactor in 2021, making CONNIE the first experiment to employ Skipper-CCDs for reactor neutrino detection. We report on the performance of the Skipper-CCDs, the new data processing and data quality selection techniques and the event selection for CE$$\nu$$NS interactions, which enable CONNIE to reach a record low detection threshold of 15 eV. The data were collected over 300 days in 2021-2022 and correspond to exposures of 14.9 g-days with the reactor-on and 3.5 g-days with the reactor-off. The difference between the reactor-on and off event rates shows no excess and yields upper limits at 95% confidence level for the neutrino interaction rates comparable with previous CONNIE limits from standard CCDs and higher exposures. Searches for new neutrino interactions beyond the Standard Model were performed, yielding an improvement on the previous CONNIE limit on a simplified model with light vector mediators. A first dark matter (DM) search by diurnal modulation was performed by CONNIE and the results represent the best limits on the DM-electron scattering cross-section, obtained by a surface-level experiment. These promising results, obtained using a very small-mass sensor, illustrate the potential of Skipper-CCDs to probe rare neutrino interactions and motivate the plans to increase the detector mass in the near future.

Research Organization:
Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Organization:
CONNIE
DOE Contract Number:
AC02-07CH11359
OSTI ID:
2468665
Report Number(s):
FERMILAB-PUB-24-0714-PPD; arXiv:2403.15976; oai:inspirehep.net:2771379
Journal Information:
TBD, Journal Name: TBD
Country of Publication:
United States
Language:
English

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Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS