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NA62
Abstract:
The NA62 experiment at CERN, designed to study the ultra-rare decay K+ → π+ nu nu-bar, 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 × 10^17 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/c^2.
