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Prospects for detecting axionlike particles at the Coherent CAPTAIN-Mills experiment
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abstract
We show results from the Coherent CAPTAIN Mills (CCM) 2019 engineering run which begin to constrain regions of parameter space for axion-like particles (ALPs) produced in electromagnetic particle showers in an 800 MeV proton beam dump, and further investigate the sensitivity of ongoing data-taking campaigns for the CCM200 upgraded detector. Based on beam-on background estimates from the engineering run, we make realistic extrapolations for background reduction based on expected shielding improvements, reduced beam width, and analysis-based techniques for background rejection. We obtain reach projections for two classes of signatures; ALPs coupled primarily to photons can be produced in the tungsten target via the Primakoff process, and then produce a gamma-ray signal in the Liquid Argon (LAr) CCM detector either via inverse Primakoff scattering or decay to a photon pair. ALPs with significant electron couplings have several additional production mechanisms (Compton scattering, $e^+e^-$ annihilation, ALP-bremsstrahlung) and detection modes (inverse Compton scattering, external $e^+e^-$ pair conversion, and decay to $e^+e^-$). In some regions, the constraint is marginally better than both astrophysical and terrestrial constraints. With the beginning of a three year run, CCM will be more sensitive to this parameter space by up to an order of magnitude for both ALP-photon and ALP-electron couplings. The CCM experiment will also have sensitivity to well-motivated parameter space of QCD axion models. It is only a recent realization that accelerator-based large volume liquid argon detectors designed for low energy coherent neutrino and dark matter scattering searches are also ideal for probing ALPs in the unexplored $\sim$MeV mass scale.
Forward citations
Cited by 6 Pith papers
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First Demonstration of a Hybrid Cherenkov and Scintillation Detector in a Proof-of-Principle Axion Search at a Beam Dump
First event-by-event Cherenkov separation from sub-MeV electrons in liquid argon enables a proof-of-principle ALP search excluding new parameter space despite no observed excess.
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Axion-Like Particle Search with a Hybrid Cherenkov-Scintillation Detector
A beam-dump experiment using a 10-ton hybrid Cherenkov-scintillation detector found no axion-like particles, but demonstrated background rejection about six times stronger than its predecessor, yielding improved exclu...
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Constraints on Axion-Like Particles with the Silicon Detector at a Nuclear Reactor
New 90% C.L. limits on the ALP–photon coupling in the 0.1–100 keV range are derived from Connie and Atucha-II reactor data via plasmon excitation in silicon; a 30 kg·yr Oscura-style run could improve on NEON by about tenfold.
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Prospects for Exploring Non-Standard Neutrino Properties with Argon-Based CEvNS Experiments
Argon CEvNS detectors at stopped-pion sources project sin²θW precision near 1%, neutrino magnetic-moment limits near 10⁻⁹ μB, charge-radius limits near 10⁻³² cm², and vector NSI sensitivity at the 10⁻² level.
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Hunting for Axions in REactor neutrino COherent scattering Detection Experiment
RECODE, a reactor experiment with two germanium detectors, could probe axion-photon and axion-electron couplings into the cosmological triangle region at masses around 0.3 to 0.9 MeV.
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New Physics Opportunities at Neutrino Facilities: BSM Physics at Accelerator, Atmospheric, and Reactor Neutrino Experiments
A workshop-based review maps beyond-Standard-Model discovery opportunities at accelerator, reactor, atmospheric, and cosmic neutrino facilities, with emphasis on East Asian programs.
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