{
  "annotation_id": "4aa37bf9-9a20-43bc-a510-bc7bfbddc253",
  "date_created": "2026-03-02T18:00:22.465000Z",
  "date_modified": "2026-03-02T18:00:22.465000Z",
  "file_hash": "2b0a9b0893dd3ed2ef549381249fdd07e438735fd74da992c2940a8635e52ee0",
  "private": false,
  "record": {
    "abstract": "A proton spin-polarizability characterizing backward Compton scattering has\nbeen extracted from a dispersion analysis of data between 33 and 309 MeV. This\nbackward spin-polarizability, \"delta\" = 27.1 +/-2.2(stat+sys) +2.8/-2.4(model)\nin units of 10^-4 fm^4, differs significantly from theoretical estimates which\nare dominated by pi0 t-channel exchange, and indicates a new contribution from\nthe non-perturbative spin-structure of the proton. This new value for \"delta\"\nremoves an apparent inconsistency in the difference of charge polarizabilities\nextracted from data above pi-threshold. Our global result, alpha-beta = 10.11\n+/-1.74(stat+sys) +1.22/-0.86 (model) in units of 10^-4 fm^3, is consistent\nwith the previous world average of data below 155 MeV. Our value for alpha+beta\n= 13.23 +/-0.86(stat+sys) +0.20/-0.49(model) is consistent with a recent\nre-evaluation of the Baldin sum rule.",
    "arxiv_id": "nucl-th/9801008",
    "authors": [
      "J. Tonnison",
      "A. M. Sandorfi",
      "S. Hoblit",
      "A. M. Nathan"
    ],
    "categories": [
      "nucl-th",
      "nucl-ex"
    ],
    "doi": "10.1103/PhysRevLett.80.4382",
    "journal_ref": "Phys.Rev.Lett. 80 (1998) 4382-4385",
    "title": "First Extraction of a Spin-Polarizability of the Proton",
    "url": "https://arxiv.org/abs/nucl-th/9801008"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "649246fc-2465-4446-b0ca-29d6a63c8125",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}