Abstract
We use QCD sum rules for the three-point function of a pseudoscalar and two nucleonic currents in order to estimate the charge dependence of the pion-nucleon coupling constant coming from isospin violation in the strong interaction. The effect can be attributed primarily to the difference of the quark condensates and . For the splitting we obtain an interval of to , the uncertainties coming mainly from the input parameters. The charged pion nucleon coupling is found to be the average of and . Electromagnetic effects are not included.
- Received 13 May 1996
DOI:https://doi.org/10.1103/PhysRevC.55.3093
©1997 American Physical Society