The relevance of the vertex bremsstrahlung photon detection in the scattering experiments at low energy

Abstract We discuss the size of the ν e ( ν e ) e − →ν e ( ν e ) e − cross section reduction due to the rejection of the events with a vertex bremsstrahlung photon above a certain energy in the final state. In particular we analyze the effect in experiments designed to detect the low energy ν e and νe from a nuclear reactor and from the Sun. We find that such reduction has to be considered in a relatively high statistic reactor experiment, while it is negligible for pp and 7Be solar neutrino detection.