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 p(lab) = 950 MeV/c. For the value at the pion pole we find f(c)2 = 0.0751 +/- 0.0017 or equivalently g(c)2 = 13.6 +/- 0.3. This result is in agreement with the value found in the recent VPI&SU analysis of pi-N scattering data. Comparing with the neutral-pion coupling constant as determined in the Nijmegen phase-shift analysis of proton-proton scattering data, we see no evidence for a charge dependence of the pion-nucleon coupling constants.