{
  "annotation_id": "630deef3-7842-4011-b239-6a72637163a6",
  "date_created": "2026-03-02T18:00:35.520000Z",
  "date_modified": "2026-03-02T18:00:35.520000Z",
  "file_hash": "6fcc3e32469030c4cec425837c0b6dadcddefdb31a6367014bfbf25d93d36d2a",
  "private": false,
  "record": {
    "abstract": "We present details from a recent test of Lorentz and CPT symmetry using\nhydrogen masers. We have placed a new limit on Lorentz and CPT violation of the\nproton in terms of a recent standard model extension by placing a bound on\nsidereal variation of the F = 1 Zeeman frequency in hydrogen. Here, the\ntheoretical standard model extension is reviewed. The operating principles of\nthe maser and the double resonance technique used to measure the Zeeman\nfrequency are discussed. The characterization of systematic effects is\ndescribed, and the method of data analysis is presented. We compare our result\nto other recent experiments, and discuss potential steps to improve our\nmeasurement.",
    "arxiv_id": "physics/0103068",
    "authors": [
      "M. A. Humphrey",
      "D. F. Phillips",
      "E. M. Mattison",
      "R. F. C. Vessot",
      "R. E. Stoner",
      "R. L. Walsworth"
    ],
    "categories": [
      "physics.atom-ph",
      "hep-ph"
    ],
    "doi": "10.1103/PhysRevA.68.063807",
    "journal_ref": "Phys.Rev.A68:063807,2003",
    "title": "Testing Lorentz and CPT symmetry with hydrogen masers",
    "url": "https://arxiv.org/abs/physics/0103068"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "e570e1f8-e69b-4300-b43e-9388ce7e644a",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}