Blast from the past: Constraints on the dark sector from the BEBC WA66 beam dump experiment

We derive limits on millicharged dark states, as well as particles with electric or magnetic dipole moments, from the number of observed forward electron scattering events at the Big European Bubble Chamber in the 1982 CERN-WA-066 beam dump experiment. The dark states are produced by the 400 GeV proton beam primarily through the decays of mesons produced in the beam dump, and the lack of excess events places bounds extending up to GeV masses. These improve on bounds from all other experiments, in particular CHARM II.

Automated summary

Limits on millicharged dark states and particles with electric or magnetic dipole moments were derived from the number of observed forward electron scattering events in the 1982 CERN-WA-066 beam dump experiment. The dark states produced by the 400 GeV proton beam primarily through meson decays placed bounds extending up to GeV masses, improving upon bounds from other experiments, particularly CHARM II.