Data from 'old' experiment appears to constrain the idea of dark photons as part of dark matter theory

A trio of physicists is suggesting in a paper they've published in Physical Review Letters, that results from an experiment run in the early 1980's places constraints on the idea of a dark photon in theories that attempt to explain the nature of dark matter. Brian Batell, Rouven Essig and Ze'ev Surujon note that a proposal already exists to construct a relatively inexpensive experiment that could be used to test the basic idea to either offer support or dispel the notion altogether.