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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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