The 17 mev anomaly in beryllium decays and u(1) portal to dark matter

The experiment of Krasznahorkay et al observed the transition of a ⁸Be excited state to its ground state and accompanied by an emission of e⁺e⁻ pair with 17 MeV invariant mass. This 6.8σ anomaly can be fitted by a new light gauge boson. We consider the new particle as a U(1) gauge boson, Z⁰, which plays as a portal linking dark sector and visible sector. In particular, we study the new U(1) gauge symmetry as a hidden or non-hidden group separately. The generic hidden U(1) model, referred to as dark Z model, is excluded by imposing various experimental constraints. On the other hand, a non-hidden Z⁰ is allowed due to additional interactions between Z⁰ and Standard Model fermions. We also study the implication of the dark matter direct search on such a scenario. We found the search for the DM-nucleon scattering cannot probe the parameter space that is allowed by ⁸Be-anomaly for the range of DM mass above 500 MeV. However, the DM-electron scattering for DM between 20 and 50 MeV can test the underlying U(1) portal model using the future Si and Ge detectors with 5e⁻ threshold charges.