2015/10/09 by E. Goudzovski, Goudzovski, Evgueni
Physics and Astronomy · #Dark Matter and Cosmic Phenomena #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions
paper · doi:10.48550/arxiv.1510.02632
openalex publication_date 2015/10/09 · openalex created_date 2022/09/28 · openalex updated_date 2026/07/28
A sample of 1.69× 107 fully reconstructed π0→γe+e- decay candidates collected by the NA48/2 experiment at CERN in 2003--2004 is analysed to search for the dark photon (A') production in the π0→γA' decay followed by the prompt A'→ e+e- decay. No signal is observed, and an exclusion region in the plane of the dark photon mass mA' and mixing parameter ε2 is established. The obtained upper limits on ε2 are more stringent than the previous limits in the mass range 9~\rm MeV/c2