{
  "annotation_id": "d9ced527-b28d-4d98-a5df-1f4810461ccc",
  "date_created": "2026-03-02T18:00:18.907000Z",
  "date_modified": "2026-03-02T18:00:18.907000Z",
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  "record": {
    "abstract": "A formalism is presented which allows covariant three-dimensional bound-state\nequations to be derived systematically from four-dimensional ones without the\nuse of delta-functions. The amplitude for the interaction of a bound state\ndescribed by these equations with an electromagnetic probe is constructed. This\namplitude is shown to be gauge invariant if the formalism is truncated at the\nsame coupling-constant order in both the interaction kernel of the integral\nequation and the electromagnetic current operator.",
    "arxiv_id": "nucl-th/9708027",
    "authors": [
      "D. R. Phillips",
      "S. J. Wallace"
    ],
    "categories": [
      "nucl-th",
      "hep-ph"
    ],
    "doi": "10.1007/s006010050084",
    "journal_ref": "Few Body Syst.24:175-191,1998",
    "title": "A covariant gauge-invariant three-dimensional description of   relativistic bound-states",
    "url": "https://arxiv.org/abs/nucl-th/9708027"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "fe8a04b9-5737-462d-bb13-478f53c998e6",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}