{
  "kind": "published-lifetime-summary",
  "source_version": "1801.01124v3",
  "source_url": "https://arxiv.org/pdf/1801.01124v3",
  "citation": "Bartosz Fornal and Benjamín Grinstein (2018), Dark Matter Interpretation of the Neutron Decay Anomaly, Physical Review Letters 120, 191801. DOI: 10.1103/PhysRevLett.120.191801. Numerical version: arXiv:1801.01124v3.",
  "claimants": "Bartosz Fornal and Benjamín Grinstein",
  "year": 2018,
  "quote": "We propose to explain this anomaly by a dark decay channel for the neutron, involving one or more dark sector particles in the final state.",
  "lifetime_unit": "s",
  "tau_bottle_s": 879.6,
  "sigma_bottle_s": 0.6,
  "tau_beam_s": 888.0,
  "sigma_beam_s": 2.0,
  "printed": {
    "gap_s": 8.4,
    "z_gap": 4.0,
    "approximate_dark_branch": 0.01,
    "approximate_proton_branch": 0.99
  },
  "companion_branch_max": 1.1e-06,
  "branch_unit": "fraction-of-all-neutron-decays",
  "locations": {
    "lifetimes": "Physical PDF page 1",
    "relation": "Equation (1), physical PDF page 1",
    "proton_branch": "Physical PDF page 1, the sentence after Equation (1): Br(n to p + anything) approximately 99%",
    "pair_cases": "Physical PDF page 3, left and right columns",
    "response": "Note added, physical PDF page 5"
  },
  "tolerances": {
    "gap_s": 0.05,
    "z_gap": 0.05,
    "branch_percentage_points": 0.1,
    "relation_absolute": 1e-12
  },
  "tolerance_reason": "Gap and significance round to one decimal place. The approximate branch tolerance is a declared page convention, not an experimental uncertainty.",
  "licence": "Factual transcription. Published article CC BY 4.0; the versioned arXiv PDF has a separate non-exclusive distribution licence and is not redistributed.",
  "licence_url": "https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.120.191801",
  "retrieved": "2026-09-22"
}