This analysis reports on dark photons identified in protons collected in dump mode, suggesting new physics sightings at CERN.
The NA62 experiment at CERN, designed to measure the highly-suppressed decay K⁺→π⁺νν, has the capability to collect data in a beam-dump mode, where $400~$GeV protons are dumped on an absorber. In this configuration, new physics (NP) particles, including dark photons, dark scalars and axion-like particles, may be produced and reach a decay volume starting 80~m downstream of the absorber. A search for NP particles decaying in flight to hadronic final states is reported, based on a blind analysis of a sample of 1.4× 10¹⁷ protons on target collected in dump mode in 2021.
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Ashraf et al. (2025) studied this question.
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