Investigating the sources of low-energy events in a SuperCDMS-HVeV detector

Albakry, M. F.; Alkhatib, I.; Amaral, D. W. P.; Aralis, T.; Aramaki, T.; Arnquist, I. J.; Ataee Langroudy, I.; Azadbakht, E.; Banik, S.; Bathurst, C.; Bauer, D. A.; Bhattacharyya, R.; Brink, P. L.; Bunker, R.; Cabrera, B.; Calkins, R.; Cameron, R. A.; Cartaro, C.; Cerdeño, D. G.; Chang, Y.-Y.; Chaudhuri, M.; Chen, R.; Chott, N.; Cooley, J.; Coombes, H.; Corbett, J.; Cushman, P.; De Brienne, F.; Dharani, S.; di Vacri, M. L.; Diamond, M. D.; Fascione, E.; Figueroa-Feliciano, E.; Fink, C. W.; Fouts, K.; Fritts, M.; Gerbier, G.; Germond, R.; Ghaith, M.; Golwala, S. R.; Hall, J.; Hassan, N.; Hines, B. A.; Hollister, M. I.; Hong, Z.; Hoppe, E. W.; Hsu, L.; Huber, M. E.; Iyer, V.; Jastram, A.; Kashyap, V. K. S.; Kelsey, M. H.; Kubik, A.; Kurinsky, N. A.; Lawrence, R. E.; Lee, M.; Li, A.; Liu, J.; Liu, Y.; Loer, B.; Lopez Asamar, E.; Lukens, P.; MacFarlane, D. B.; Mahapatra, R.; Mandic, V.; Mast, N.; Mayer, A. J.; Meyer zu Theenhausen, H.; Michaud, É.; Michielin, E.; Mirabolfathi, N.; Mohanty, B.; Nagorny, S.; Nelson, J.; Neog, H.; Novati, V.; Orrell, J. L.; Osborne, M. D.; Oser, S. M.; Page, W. A.; Partridge, R.; Pedreros, D. S.; Podviianiuk, R.; Ponce, F.; Poudel, S.; Pradeep, A.; Pyle, M.; Rau, W.; Reid, E.; Ren, R.; Reynolds, T.; Roberts, A.; Robinson, A. E.; Saab, T.; Sadoulet, B.; Saikia, I.; Sander, J.; Sattari, A.; Schmidt, B.; Schnee, R. W.; Scorza, S.; Serfass, B.; Poudel, S. S.; Sincavage, D. J.; Stanford, C.; Street, J.; Sun, H.; Thasrawala, F. K.; Toback, D.; Underwood, R.; Verma, S.; Villano, A. N.; von Krosigk, B.; Watkins, S. L.; Wen, O.; Williams, Z.; Wilson, M. J.; Winchell, J.; Wykoff, K.; Yellin, S.; Young, B. A.; Yu, T. C.; Zatschler, B.; Zatschler, S.; Zaytsev, A.; Zhang, E.; Zheng, L.; Zuber, S.

doi:10.1103/physrevd.105.112006

Published June 1, 2022 | Version Submitted + Published

Journal Article Open

Investigating the sources of low-energy events in a SuperCDMS-HVeV detector

1. University of British Columbia
2. TRIUMF
3. University of Toronto
4. Durham University
5. California Institute of Technology
6. Northeastern University
7. Pacific Northwest National Laboratory
8. Texas A&M University
9. National Institute of Science Education and Research
10. University of Florida
11. Fermilab
12. SLAC National Accelerator Laboratory
13. Stanford University
14. Southern Methodist University
15. Institute for Theoretical Physics
16. Northwestern University
17. South Dakota School of Mines and Technology
18. Queen's University
19. University of Minnesota
20. University of Montreal
21. Karlsruhe Institute of Technology
22. Universität Hamburg
23. University of California, Berkeley
24. Snolab
25. Laurentian University
26. University of Colorado Denver
27. University of South Dakota
28. Lawrence Berkeley National Laboratory
29. Santa Clara University

Recent experiments searching for sub−GeV/c² dark matter have observed event excesses close to their respective energy thresholds. Although specific to the individual technologies, the measured excess event rates have been consistently reported at or below event energies of a few-hundred eV, or with charges of a few electron-hole pairs. In the present work, we operated a 1-g silicon SuperCDMS-HVeV detector at three voltages across the crystal (0, 60 and 100 V). The 0 V data show an excess of events in the tens of eV region. Despite this event excess, we demonstrate the ability to set a competitive exclusion limit on the spin-independent dark matter–nucleon elastic scattering cross section for dark matter masses of O(100) MeV/c², enabled by operation of the detector at 0 V potential and achievement of a very low O(10) eV threshold for nuclear recoils. Comparing the data acquired at 0, 60 and 100 V potentials across the crystal, we investigated possible sources of the unexpected events observed at low energy. The data indicate that the dominant contribution to the excess is consistent with a hypothesized luminescence from the printed circuit boards used in the detector holder.

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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP3. (Received 21 April 2022; accepted 31 May 2022; published 22 June 2022) We thank Noemie Bastidon for her work in the preliminary design of our optical fiber setup and wire bonding. We gratefully acknowledge support from the U.S. Department of Energy (DOE) Office of High Energy Physics and from the National Science Foundation (NSF). This work was supported in part under NSF Grants No. 1809730 and No. 1707704, as well as by the Arthur B. McDonald Canadian Astroparticle Physics Research Institute, NSERC Canada, the Canada Excellence Research Chair Fund, Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Project No. 420484612 and under Germany's Excellence Strategy—EXC 2121 "Quantum Universe"—390833306, and the Department of Atomic Energy Government of India (DAE) under the project "Research in basic sciences" (Dark matter). Fermilab is operated by Fermi Research Alliance, LLC, under Contract No. DE-AC02-37407CH11359 with the U.S. Department of Energy. Pacific Northwest National Laboratory (PNNL) is operated by Battelle Memorial Institute for the DOE under Contract No. DE-AC05-76RL01830. SLAC is operated under Contract No. DEAC02-76SF00515 with the United States Department of Energy.

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Eprint ID: 115630
Resolver ID: CaltechAUTHORS:20220715-332445000

Describes: 10.1103/PhysRevD.105.112006 (DOI); https://arxiv.org/abs/2204.08038 (URL)

NSF
PHY-1809730
NSF
PHY-1707704
Arthur B. McDonald Canadian Astroparticle Physics Research Institute
Natural Sciences and Engineering Research Council of Canada (NSERC)
Canada Excellence Research Chair Fund
Deutsche Forschungsgemeinschaft (DFG)
420484612
Deutsche Forschungsgemeinschaft (DFG)
390833306
Department of Atomic Energy (India)
Department of Energy (DOE)
DE-AC02-37407CH11359
Department of Energy (DOE)
DE-AC05-76RL01830
Department of Energy (DOE)
DEAC02-76SF00515
SCOAP3

Created: 2022-07-18

Created from EPrint's datestamp field
Updated: 2022-07-18

Created from EPrint's last_modified field

Caltech groups: Astronomy Department

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Investigating the sources of low-energy events in a SuperCDMS-HVeV detector

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