First Dark Matter Search Results From Coherent CAPTAIN-Mills

Abstract

This paper describes the operation of the Coherent CAPTAIN-Mills (CCM) detector located at the Lujan Neutron Science Center (LANSCE) at Los Alamos National Laboratory (LANL). CCM is a 10-ton liquid argon (LAr) detector located 20 meters from a high flux neutron/neutrino source and is designed to search for sterile neutrinos (${\nu }_s$) and light dark matter (LDM). An engineering run was performed in Fall 2019 to study the characteristics of the CCM120 detector by searching for coherent scattering signals consistent with ${\nu }_s$'s and LDM resulting from ${\pi }^{+}$ and ${\pi }^0$ decays in the tungsten target. New parameter space in a leptophobic dark matter model was excluded for DM masses between $\sim 2.0$ and 30 MeV. The lessons learned from this run have guided the development and construction of the new CCM200 detector that will begin operations in 2021 and significantly improve on these searches.

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• General Kinetic Mixing in Gauged $U(1{)}_{L_{\mu }-L_{\tau }}$ Model for Muon $g-2$ and Dark Matter
• Prospects for detecting axionlike particles at the Coherent CAPTAIN-Mills experiment
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• Recent Progress in Low Energy Neutrino Scattering Physics and Its Implications for the Standard and Beyond the Standard Model Physics
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• A Snowmass Whitepaper: Dark Matter Production at Intensity-Frontier Experiments
• Detection and Calibration of Low-Energy Nuclear Recoils for Dark Matter and Neutrino Scattering Experiments
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• Searches for CEνNS and Physics beyond the Standard Model using Skipper-CCDs at CONNIE
• Testing the dark side of neutrino oscillations with the solar neutrino fog at Dark Matter experiments
• COHERENT at the Spallation Neutron Source
• Dark Matter Internal Pair Production -- A Novel Direct Detection Mechanism
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• Constraining neutrino charges at beam experiments
• Atmospheric resonant production for light dark sectors