Search for pseudoscalar bosons decaying into $e^{+}{e}^{-}$ pairs in the NA64 experiment at the CERN SPS

Yu. M. Andreev, D. Banerjee, J. Bernhard +52

We report the results of a search for a light pseudoscalar particle $a$ that couples to electrons and decays to $e^{+}{e}^{-}$ performed using the high-energy CERN SPS H4 electron beam.…