Determination of the charged-pion coupling constant from data on the charge-exchange reactionp¯p→n¯n

The coupling constant of the charged pions to nucleons is extracted from a partial-wave analysis of antinucleon-nucleon scattering data below plab=950 MeV/c. For the value at the pion pole we find fc²=0.0751±{}0.0017 or equivalently gc²=13.6±{}0.3. This result is in agreement with the value found in the recent VPI analysis of {π}N scattering data. Comparing with the neutral-pion coupling constant as determined in the Nijmegan phase-shift analysis of proton-proton scattering data, we see no evidence for a charge dependence of the pion-nucleon coupling constants.