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Search for dark photon decays to μ + μ − at NA62

Research output: Contribution to Journal/MagazineJournal articlepeer-review

  • NA 62 Collaboration
Article number35
<mark>Journal publication date</mark>6/09/2023
<mark>Journal</mark>Journal of High Energy Physics
Issue number9
Publication StatusPublished
<mark>Original language</mark>English


The NA62 experiment at CERN, designed to study the ultra-rare decay K+ → π+νν¯, has also collected data in beam-dump mode. In this configuration, dark photons may be produced by protons dumped on an absorber and reach a decay volume beginning 80 m downstream. A search for dark photons decaying in flight to μ+μ− pairs is reported, based on a sample of 1.4 × 1017 protons on dump collected in 2021. No evidence for a dark photon signal is observed. A region of the parameter space is excluded at 90% CL, improving on previous experimental limits for dark photon masses between 215 and 550 MeV/c2.