{"paper":{"title":"New measurements of the $\\eta$ and $K^0$ masses","license":"","headline":"","cross_cats":[],"primary_cat":"hep-ex","authors_text":"A.Lai, et al, NA48 collaboration","submitted_at":"2002-04-08T07:35:06Z","abstract_excerpt":"New measurements of the $\\eta$ and $K^0$ masses have been performed using decays to 3$\\pi^0$ with the NA48 detector at the CERN SPS. Using symmetric decays to reduce systematic effects, the results $M(\\eta) = 547.843\\pm0.051$ MeV/c$^2$ and $M(K^0) = 497.625\\pm0.031$ MeV/c$^2$ were obtained."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"hep-ex/0204008","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}