{"slug":"strong-cp","name":"The Strong CP Problem","blurb":"Why quantum chromodynamics conserves CP symmetry.","kind":"curated","status":"live","definition":{"terms":["strong cp problem","strong cp violation"],"msc":[],"cats":["hep-ph"]},"created_at":"2026-08-11T02:18:14.238165+00:00","updated_at":"2026-08-11T02:18:14.238165+00:00","counts":{"claims_by_tier":{"stated":65},"claims_by_method":{"signals":44,"phrase":21},"papers":65}}