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We estimate the values of Yukawa couplings of a light pseudoscalar A with amass of about 17 MeV, which would explain the $^8Be$ anomaly observed in theAtomki pair spectrometer experiment. The resulting couplings of A to up anddown type quarks are about 0.3 times the coupling of the standard Higgs boson.Then constraints from K and B decays require that loop contributions to flavourchanging vertices cancel at least at the 10% level. Constraints from beam dumpexperiments require the coupling of A to electrons to be larger than about 4times the coupling of the standard Higgs boson, leading to a short enough Alife time consistent with an explanation of the anomaly.

Possible Explanation of the Electron Positron Anomaly at 17 MeV in $^8Be$ Transitions Through a Light Pseudoscalar