Search for invisible decays of sub-GeV dark photons in missing-energy events at the CERN SPS
Abstract
We report on a direct search for sub-GeV dark photons (A′), which might be produced in the reaction e−Z→e−ZA′ via kinetic mixing with photons by 100 GeV electrons incident on an active target in the NA64 experiment at the CERN SPS. The dark photons would decay invisibly into dark matter particles resulting in events with large missing energy. No evidence for such decays was found with 2.75×109 electrons on target. We set new limits on the γ−A′ mixing strength and exclude the invisible A′ with a mass ≲100 MeV as an explanation of the muon gμ−2 anomaly. Show more
Permanent link
https://doi.org/10.3929/ethz-b-000125220Publication status
publishedExternal links
Journal / series
Physical Review LettersVolume
Pages / Article No.
Publisher
American Physical SocietyOrganisational unit
03503 - Rubbia, André / Rubbia, André
03503 - Rubbia, André / Rubbia, André
Funding
169133 - NA64 - Search for Dark Sectors in Missing Energy Events (SNF)
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