Production of dark sector particles via resonant positron annihilation on atomic electrons
arxiv(2024)
摘要
Resonant positron annihilation on atomic electrons provides a powerful method
to search for light new particles coupled to e^+e^-. Reliable estimates of
production rates require a detailed characterization of electron momentum
distributions. We describe a general method that harnesses the target material
Compton profile to properly include electron velocity effects in resonant
annihilation cross-sections. We additionally find that high Z atoms can
efficiently act as particle physics accelerators, providing a density of
relativistic electrons that allows to extend by several times the experimental
mass reach.
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