{
 "id": "LIB2-305",
 "entry_version": 7,
 "class": "OPEN",
 "title": "Supply the missing QCD flip energy in the neutron–proton splitting",
 "statement": "Can a QCD flip energy complete the neutron–proton mass-difference calculation alongside the existing Coulomb/QED contribution?",
 "scope": {
  "carrier": "The QCD flip contribution and the existing Coulomb/QED term",
  "domain": "The unpriced physical neutron–proton difference, not the selected isospin Casimir coefficient.",
  "group": null,
  "hypotheses": [],
  "physical_target": null,
  "quantifier": null,
  "real_form": null
 },
 "source_labels_as_printed": {
  "math_status": null,
  "attachment": null,
  "scorecard_tier_word": null,
  "pdf_page": null
 },
 "house_tier": null,
 "review_state": "IN_REVIEW",
 "scientific_status": "OPEN",
 "evidence_status": [
  {
   "kind": "registry",
   "availability": "shipped"
  }
 ],
 "primary_source": {
  "component": "Paper 9",
  "section": "§9, Isospin sector: unpriced neutron–proton difference",
  "pdf_page": 138,
  "quote": "The neutron–proton mass difference mn − mp = 1.2933 MeV is unpriced: the framework carries the QED half (Coulomb, with α external) and no QCD half (mu = md at constituent level; the e7 flip carries no energy), so without a flip energy its sign comes out wrong (s1129)."
 },
 "caution": "No neutron–proton mass prediction or continuous isospin dynamics follows from the registered parity alone.",
 "candidate_ids": [
  "C2-130"
 ],
 "basis": {
  "pdf_sha256_prefix": "b64ddcd9e16a6dcd",
  "release": "Rev33.1_S369"
 },
 "relationships": [
  {
   "type": "related_to",
   "target": "LIB2-160"
  },
  {
   "type": "related_to",
   "target": "LIB2-161"
  },
  {
   "type": "related_to",
   "target": "LIB2-304"
  }
 ],
 "url": "/library-v2/LIB2-305/",
 "content_sha256": "d3679502657fdfa424f5dec97e1b95ab8163e18668cf54e29001f133b8714e01",
 "build_stamp": "BUILD_STAMP S371a · 2026-09-26T22:53Z · master 01d1a5873ede42f5 · cut 9dcc6ce9a8ee3e02"
}