We propose an experiment to search for a new gauge boson A in e + e − annihilation by means of a positron beam incident on a gas hydrogen target internal to the bypass at the VEPP-3 storage ring. The search method is based on a missing mass spectrum in the reaction e + e − → γA . It allows observation of the A signal independently of its decay modes and life time. The projected result of this experiment corresponds to an upper limit on the square of the coupling constant ε 2 = 3 · 10 −8 with a signal-to-noise ratio of two to one at an A mass of 5-20 MeV.

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VEPP-2000 is electron-positron collider exploiting the novel concept of round colliding beams. After three seasons of data taking in the whole energy range of 160  1000 MeV per beam it was stopped in 2013 for injection chain upgrade. The linking to the new BINP source of intensive beams together with booster synchrotron modernization provides the drastic luminosity gain at top energy

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