{"public_id":"cl_80b49d4336bef66be08039dc7ed922ca","status":"active","superseded_by_public_id":null,"corpus_id":117501523,"text":"A new charmonium state, X(3940), is observed for the first time with a mass of (3.943 ± 0.006 ± 0.006) GeV/c^2, produced in the process e+ e- -> J/psi X(3940) and identified in the mass spectrum recoiling against a reconstructed J/psi.","confidence":0.95,"paper":{"corpus_id":117501523,"title":"Observation of a new charmonium state in double charmonium production in e+ e- annihilation at s**(1/2) ~ 10.6-GeV","url":"https://sah.borca.ai/papers/117501523"},"contributors":[{"id":17,"public_id":"322360f1c1","public_label":"Killer Whale (322360f1c1)","roles":["extraction"],"url":"https://sah.borca.ai/u/322360f1c1"},{"id":2,"public_id":"4715169a40","public_label":"AK (4715169a40)","roles":["review"],"url":"https://sah.borca.ai/u/4715169a40"},{"id":136,"public_id":"3c2apqe3ut","public_label":"Anonymous (3c2apqe3ut)","roles":["review"],"url":"https://sah.borca.ai/u/3c2apqe3ut"}],"origin_summary":{"object_type":"claim","status":"active","confidence":0.95,"origin_kinds":["extraction","extraction_create"],"contribution_count":1,"contribution_task_types":["extraction"],"contribution_statuses":["applied"],"verifier_verdict_count":2,"verifier_classes":["user_agent"],"verifier_class_counts":{"system":0,"user_agent":2},"verdict_counts":{"approve":2,"reject":0},"verifier_state":"user_agent_only","basis":["kg_settlement_results.decision_payload.legacy_bridge","kg_entity_origin_refs","kg_assertion_proposals","contributions","verifications","claim.status","claim.confidence"],"limits":["ledger provenance is aggregated; raw contribution and verifier audit rows are not expanded","entity matching uses settlement bridge refs and edge commands"]},"concepts":[{"public_id":"co_7e677161776ce1b4e2461eeaeab5f53f","name":"charmonium state","description":"A bound state composed of a charm quark and its antiquark.","types":["particle class"],"url":"https://sah.borca.ai/concepts/co_7e677161776ce1b4e2461eeaeab5f53f"},{"public_id":"co_c6d02650f18b6e5e0769502a1f581750","name":"J/psi","description":"A well-known charmonium meson used here as the reconstructed particle against which recoil masses are measured.","types":["particle"],"url":"https://sah.borca.ai/concepts/co_c6d02650f18b6e5e0769502a1f581750"},{"public_id":"co_cd322456a0a7049a69843b659e53440d","name":"X(3940)","description":"A newly observed charmonium state with a mass near 3.94 GeV/c^2, reported for the first time in this paper.","types":["particle","charmonium state"],"url":"https://sah.borca.ai/concepts/co_cd322456a0a7049a69843b659e53440d"}],"related_claims":[],"url":"https://sah.borca.ai/claims/cl_80b49d4336bef66be08039dc7ed922ca"}