On search for a new light gauge boson from π0(η)→γ+X decays in neutrino experiments

It is shown that a new light gauge boson X which might be produced in the decays of pseudoscalar mesons π0(η)→γ+X could be effectively searched for in neutrino experiments via the Primakoff effect, in the process of X+Z→π0(η)+Z conversion in the external Coulomb field of a nucleus. An estimate of the X→π0 conversion rate for the NOMAD neutrino detector at CERN is given.