{
  "annotation_id": "637a99af-bbb9-4f92-834d-21485d3709f6",
  "date_created": "2026-03-02T18:00:22.405000Z",
  "date_modified": "2026-03-02T18:00:22.405000Z",
  "file_hash": "a0be15da2e3bc11f635ae3a11f7d2b1163f94b45a879378fa25398eaa78f1bf3",
  "private": false,
  "record": {
    "abstract": "The nucleon-deuteron analyzing power $A_y$ in elastic nucleon-deuteron\nscattering poses a longstanding puzzle. At energies $E_{lab}$ below\napproximately 30 MeV $A_y$ cannot be described by any realistic NN force. The\ninclusion of existing three-nucleon forces does not improve the situation.\nBecause of recent questions about the $^3P_J$ NN phases, we examine whether\nreasonable changes in the NN force can resolve the puzzle. In order to do this\nwe investigate the effect on the $^3P_J$ waves produced by changes in different\nparts of the potential (viz., the central force, tensor force, etc.), as well\nas on the 2-body observables and on $A_y$. We find that it is not possible with\nreasonable changes in the NN potential to increase the 3-body $A_y$ and at the\nsame time to keep the 2-body observables unchanged. We therefore conclude that\nthe $A_y$ puzzle is likely to be solved by new three-nucleon forces, such as\nthose of spin-orbit type, which have not yet been taken into account.",
    "arxiv_id": "nucl-th/9803038",
    "authors": [
      "D. H\u00fcber",
      "J. L. Friar"
    ],
    "categories": [
      "nucl-th"
    ],
    "doi": "10.1103/PhysRevC.58.674",
    "journal_ref": "Phys.Rev.C58:674-685,1998",
    "title": "The $A_y$ Puzzle and the Nuclear Force",
    "url": "https://arxiv.org/abs/nucl-th/9803038"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "369e9757-f3a4-4877-9f9c-8a5546526d6b",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}