We report the first results of a search for leptophobic dark matter (DM) from the Coherent-CAPTAIN-Mills (CCM) liquid argon (LAr) detector. An engineering run with 120 photomultiplier tubes (PMTs) and 17.9×1020 protons on target (POT) was performed in fall 2019 to study the characteristics of the CCM detector. The operation of this 10-ton detector was strictly light based with a threshold of 50 keV and used coherent elastic scattering off argon nuclei to detect DM. Despite only 1.5 months of accumulated luminosity, contaminated LAr, and nonoptimized shielding, CCM's first engineering run has already achieved sensitivity to previously unexplored parameter space of light dark matter models with a baryonic vector portal. With an expected background of 115 005 events, we observe 115 005+16.5 events which is compatible with background expectations. For a benchmark mediator-to-DM mass ratio of mVB/mχ=2.1, DM masses within the range 9 MeV≲mχ≲50 MeV are excluded at 90% C. L. in the leptophobic model after applying the Feldman-Cousins test statistic. CCM's upgraded run with 200 PMTs, filtered LAr, improved shielding, and 10 times more POT will be able to exclude the remaining thermal relic density parameter space of this model, as well as probe new parameter space of other leptophobic DM models.
Bibliographical noteFunding Information:
We thank Brian Batell for useful discussions on leptophobic DM models. This work was funded by the U.S. Department of Energy, the U.S. National Science Foundation, Los Alamos National Laboratory LDRD program, and support from Programa de Apoyo a Proyectos de Investigación e Innovación Tecnológica and Universidad Nacional Autónoma de México (PAPIIT-UNAM) Grants No. IT100420, No. NSF-1801996, and No. DOE-HEP DE-SC0009824. We also wish to acknowledge support from the LANSCE Lujan Center and LANL’s Accelerator Operations and Technology division. This research used resources provided by the Los Alamos National Laboratory Institutional Computing Program, which is supported by the U.S. Department of Energy National Nuclear Security Administration under Contract No. 89233218CNA000001.
© 2022 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"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.
PubMed: MeSH publication types
- Journal Article