{
  "annotation_id": "f5b4654a-4ba7-4e5d-aff8-602b1de43455",
  "date_created": "2026-03-02T18:00:25.838000Z",
  "date_modified": "2026-03-02T18:00:25.838000Z",
  "file_hash": "c68c1c98d536863987f769d7423e2be8ee45994db01f4690272441b9d78ae980",
  "private": false,
  "record": {
    "abstract": "We search $t$-matrix poles for $\\Lambda N-\\Sigma N$ coupling interactions\nusing two soft core models of the Nijmegen group which bind the hypertriton at\nthe correct binding energy, and hard core models which are still influential in\nhypernuclear physics. To treat the hard core potentials, a useful method for\ncalculating the off-shell $t$-matrix is proposed. We find poles close to the\n$\\Sigma N$ threshold in the second or third quadrant of the complex plane of\nthe $\\Sigma N$ relative momentum. The relation between the poles and the shape\nof the $\\Lambda N$ elastic total cross section is discussed based on a\nso-called uniformization by which two-channel $t$-matrices become single-valued\non a complex valuable. We also find poles near the $\\Lambda N$ threshold. These\nare correlated to the $S$-wave $\\Lambda N$ scattering lengths, the values of\nwhich have yet to be determined.",
    "arxiv_id": "nucl-th/9904002",
    "authors": [
      "K. Miyagawa",
      "H. Yamamura"
    ],
    "categories": [
      "nucl-th"
    ],
    "doi": "10.1103/PhysRevC.60.024003",
    "title": "$S$-matrix poles near the $\\Lambda N$ and $\\Sigma N$ Thresholds in the   Coupled \\\\$\\Lambda N-\\Sigma N$ System",
    "url": "https://arxiv.org/abs/nucl-th/9904002"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "3353c7b5-e007-4852-bebb-4ea60e812961",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}