Isospin Breaking in the Pion-Nucleon Coupling from QCD Sum Rules
| dc.creator | Meissner, T. | |
| dc.creator | Henley, E. M. | |
| dc.date | 1996-01-20 | |
| dc.date | 1997-05-16 | |
| dc.date.accessioned | 2026-07-07T11:15:38Z | |
| dc.date.available | 2026-07-07T11:15:38Z | |
| dc.description | 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 $g_{NNπ}$ coming from isospin violation in the strong interaction. The effect can be attributed primarily to the difference of the quark condensates $<{\bar u}u>$ and $<{\bar d}d>$. For the splitting $(g_{ppπ_0} - g_{nnπ_0}) / g_{NNπ}$ we obtain an interval of $1.2 * 10^{-2}$ to $3.7 * 10^{-2}$, the uncertainties coming mainly from the input parameters. The charged pion nucleon coupling is found to be the average of $g_{ppπ_0}$ and $g_{nnπ_0}$. Electromagnetic effects are not included. | |
| dc.description | 18 pages (REVTeX) + 2 figures (as PostScript), to be published in PRC, replaced with final version: inclusion of pi-eta mixing and N -> N* transitions | |
| dc.identifier | https://arxiv.org/abs/nucl-th/9601030 | |
| dc.identifier | http://arxiv.org/abs/nucl-th/9601030 | |
| dc.identifier | Phys.Rev.C55:3093-3099,1997 | |
| dc.identifier | doi:10.1103/PhysRevC.55.3093 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/192447 | |
| dc.subject | Nuclear Theory | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.title | Isospin Breaking in the Pion-Nucleon Coupling from QCD Sum Rules | |
| dc.type | text |