dorsal/arxiv
View SchemaIsospin Breaking in the Pion-Nucleon Coupling from QCD Sum Rules
| Authors | T. Meissner, E. M. Henley |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9601030 |
| URL | https://arxiv.org/abs/nucl-th/9601030 |
| DOI | 10.1103/PhysRevC.55.3093 |
| Journal | Phys.Rev.C55:3093-3099,1997 |
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 $g_{NN\pi}$ 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 $(g_{pp\pi_0} - g_{nn\pi_0}) / g_{NN\pi}$ 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 $g_{pp\pi_0}$ and $g_{nn\pi_0}$. Electromagnetic effects are not included.
{
"annotation_id": "a930307d-4d10-458c-8779-b4ca6cad708f",
"date_created": "2026-03-02T18:00:14.813000Z",
"date_modified": "2026-03-02T18:00:14.813000Z",
"file_hash": "c3fb3802b28598c2dfaf08896d3c2982c70d67a4cb7f92644a3e715499fc8a75",
"private": false,
"record": {
"abstract": "We use QCD sum rules for the three point function of a pseudoscalar and two\nnucleonic currents in order to estimate the charge dependence of the pion\nnucleon coupling constant $g_{NN\\pi}$ coming from isospin violation in the\nstrong interaction. The effect can be attributed primarily to the difference of\nthe quark condensates $\u003c{\\bar u}u\u003e$ and $\u003c{\\bar d}d\u003e$. For the splitting\n$(g_{pp\\pi_0} - g_{nn\\pi_0}) / g_{NN\\pi}$ we obtain an interval of $1.2 *\n10^{-2}$ to $3.7 * 10^{-2}$, the uncertainties coming mainly from the input\nparameters. The charged pion nucleon coupling is found to be the average of\n$g_{pp\\pi_0}$ and $g_{nn\\pi_0}$. Electromagnetic effects are not included.",
"arxiv_id": "nucl-th/9601030",
"authors": [
"T. Meissner",
"E. M. Henley"
],
"categories": [
"nucl-th",
"hep-ph"
],
"doi": "10.1103/PhysRevC.55.3093",
"journal_ref": "Phys.Rev.C55:3093-3099,1997",
"title": "Isospin Breaking in the Pion-Nucleon Coupling from QCD Sum Rules",
"url": "https://arxiv.org/abs/nucl-th/9601030"
},
"schema_id": "dorsal/arxiv",
"source": {
"execution_id": "80c7978f-6ca2-4391-bb42-097d5d65b7a4",
"id": "arXiv Dataset IDs",
"type": "Model",
"variant": "snapshot-2026-03-01",
"version": "0.1.0"
},
"user_id": 1000002
}