Determination of the charged-pion coupling constant from data on the charge-exchange reaction p¯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 ${\mathit{p}}_{\mathrm{lab}}$=950 MeV/c. For the value at the pion pole we find ${\mathit{f}}_{\mathit{c}}^2$=0.0751±0.0017 or equivalently ${\mathit{g}}_{\mathit{c}}^2$=13.6±0.3. This result is in agreement with the value found in the recent VPI&SU analysis of πN 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.