Production of dark sector particles via resonant positron annihilation on atomic electrons

2024/03/22 by Fernando Arias-Aragón, Arias-Aragón, Fernando, Luc Darmé +5 · 1 citation
Engineering · Physics and Astronomy · #Dark Matter and Cosmic Phenomena #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph) #Photocathodes and Microchannel Plates #Radiation Detection and Scintillator Technologies

paper · pdf · doi:10.48550/arxiv.2403.15387

openalex publication_date 2024/03/22 · openalex created_date 2024/03/26 · openalex updated_date 2026/07/30

Abstract

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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• Unveiling atomic electron motion effects in e⁺e^- high energy collisions at NA64

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