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Searching for light dark matter through Positronium decay

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A novel approach to detect light dark matter through the observation of a single photon in the decay of Positronium (Ps) is proposed. Branching ratio calculations indicate that light dark matter coupling to the Standard Model through a novel dark vector boson in the mass range mA = 10–500 keV with strength ϵ = 2 × 10−5–10−8 is well above the previously computed Standard Model background decay Ps → γν̄ν and could be sensitive to observation.

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Correspondence to Jesús Pérez-Ríos.

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Contribution to the Topical Issue “Low Energy Positron and Electron Interactions”, edited by James Sullivan, Ron White, Michael Bromley, Ilya Fabrikant, and David Cassidy.

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Pérez-Ríos, J., Love, S.T. Searching for light dark matter through Positronium decay. Eur. Phys. J. D 72, 44 (2018).

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