{
  "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
}