{
  "annotation_id": "00febfee-68de-43b2-8c48-eeb3a35042c5",
  "date_created": "2026-03-02T18:00:25.256000Z",
  "date_modified": "2026-03-02T18:00:25.256000Z",
  "file_hash": "03dd26d9f2ae651af96b8b3dae11443477ebce1009feeb0ee4061a65320f6d84",
  "private": false,
  "record": {
    "abstract": "The deuteron, NN analyzing powers A_y, and the singlet scattering length show\ngreat sensitivity to the $\\pi NN$ coupling constant $g_\\pi$. While the pp A_y\ndata favor $g^2_\\pi/4\\pi\\leq 13.6$, the np A_y data and the deuteron quadrupole\nmoment imply $g^2_\\pi/4\\pi\\geq 14.0$. The two diverging values could be\nreconciled by the assumption of (substantial) charge-splitting of $g_\\pi$.\nHowever, the established theoretical explanation of the charge-dependence of\nthe $^1S_0$ scattering length (based upon pion mass splitting) is very\nsensitive to a difference between $g_{\\pi^0}$ and $g_{\\pi^\\pm}$ and rules out\nany substantial charge-splitting of $g_\\pi$. Thus, there are real and large\ndiscrepancies between the values for $g_\\pi$ extracted from different NN\nobservables. Future work that could resolve the problems is suggested.",
    "arxiv_id": "nucl-th/9909036",
    "authors": [
      "R. Machleidt"
    ],
    "categories": [
      "nucl-th"
    ],
    "doi": "10.1238/Physica.Topical.087a00047",
    "journal_ref": "Phys.Scripta T87:47-52,2000",
    "title": "How sensitive are various NN observables to changes in the $\\pi NN$   coupling constant?",
    "url": "https://arxiv.org/abs/nucl-th/9909036"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "a0de0167-27c2-4bfc-acd7-9eaf51c67d6f",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}