PoS - Proceedings of Science
Volume 380 - Particles and Nuclei International Conference 2021 (PANIC2021) - Dark Matter and Cosmology
Exploiting the Migdal effect to improve the sensitivity to light dark matter
A. Messina*, G. Grilli di Cortona and S. Piacentini
Full text: pdf
Pre-published on: March 01, 2022
Published on: May 24, 2022
To date, the search for dark matter weakly interacting massive particles with noble elements has probed masses down and below a GeV/c$^2$. The ultimate limit is represented by the experimental threshold on the energy transfer to the nuclear recoil. Currently, the experimental sensitivity has reached a threshold equivalent to a few ionization electrons. In these conditions, the contribution of a so-called Migdal electron due to the sudden acceleration of a nucleus after a collision might be sizeable. We present a recent work where, using a Bayesian approach, we studied how these effects can be exploited in experiments based on liquid argon detectors. We develop a simulated experiment to show how the Migdal electron allows to push the experimental sensitivity down to masses of 0.1 GeV/c$^2$, extending the search region for dark matter particles of previous results. Finally, given the relevance of the Migdal electrons to the search for low mass dark matter, we discuss some new ideas on how to possibly measure such an effect with detectors based on a time projection chamber exposed to a high neutron flux.
DOI: https://doi.org/10.22323/1.380.0051
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