{
  "annotation_id": "3293c319-8b54-4537-9527-b7cb0321427a",
  "date_created": "2026-03-02T18:01:07.831000Z",
  "date_modified": "2026-03-02T18:01:07.831000Z",
  "file_hash": "8ed132d7b27d0585817b7f891a015d4b051e992b8d15af136b4f4668e34a5df9",
  "private": false,
  "record": {
    "abstract": "The optical theorem is applied to the process of electron-positron pair\ncreation in the superposition of a nuclear Coulomb and a strong laser field. We\nderive new representations for the total production rate as two-fold integrals,\nboth for circular laser polarization and for the general case of elliptic\npolarization, which has not been treated before. Our approach allows us to\nobtain by analytical means the asymptotic behaviour of the pair creation rate\nfor various limits of interest. In particular, we consider pair production by\ntwo-photon absorption and show that, close to the energetic threshold of this\nprocess, the rate obeys a power law in the laser frequency with different\nexponents for linear and circular laser polarization. With the help of the\nupcoming x-ray laser sources our results could be tested experimentally.",
    "arxiv_id": "physics/0603069",
    "authors": [
      "A. I. Milstein",
      "C. M\u00fcller",
      "K. Z. Hatsagortsyan",
      "U. D. Jentschura",
      "C. H. Keitel"
    ],
    "categories": [
      "physics.atom-ph"
    ],
    "doi": "10.1103/PhysRevA.73.062106",
    "journal_ref": "Phys. Rev. A 73, 062106 (2006)",
    "title": "Polarization operator approach to electron-positron pair production in   combined laser and Coulomb fields",
    "url": "https://arxiv.org/abs/physics/0603069"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "110d0fa8-80e5-4946-a8fc-774515c94b0d",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}