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They are probably stable and very narrow. The masses for the doubly hidden-charm states $cc\\bar c\\bar c$ are higher than the spontaneous dissociation thresholds of two charmonium mesons. We suggest to search for such states in the $J/\\psi J/\\psi$ and $\\eta_c(1S)\\eta_c(1S)$ channels."},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1803.02522","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2018-03-07T04:56:52Z","cross_cats_sorted":[],"title_canon_sha256":"f69935036320d864e0e3ae3d43ca08a24cf6e574c0ac0798095b8621bd62baf2","abstract_canon_sha256":"ef4c69a75e65f1864197a3f7e425e7dc328b2ea8ad6cd9d26e4e225cffaf4e4c"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:07:10.513378Z","signature_b64":"UR+35TRZepwO/Vg/m4y8t44IgsFiaQwlVXaumfFkX3hQggrZpMCTH4HRUT16Mksr2ksJAVDkNlg5ow//QGD6DQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"9a81c43b7782825d61d388d28acb65ab1890e1ee77d2a37bb79692726cdb53d7","last_reissued_at":"2026-05-18T00:07:10.512607Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:07:10.512607Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Doubly hidden-charm/bottom $QQ\\bar Q\\bar Q$ tetraquark states","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"hep-ph","authors_text":"Hua-Xing Chen, Shi-Lin Zhu, T. G. Steele, Wei Chen, Xiang Liu","submitted_at":"2018-03-07T04:56:52Z","abstract_excerpt":"We study the mass spectra for the $cc\\bar c\\bar c$ and $bb\\bar b\\bar b$ tetraquark states by developing a moment sum rule method. Our results show that the $bb\\bar b\\bar b$ tetraquarks lie below the threshold of $\\eta_b(1S)\\eta_b(1S)$. They are probably stable and very narrow. The masses for the doubly hidden-charm states $cc\\bar c\\bar c$ are higher than the spontaneous dissociation thresholds of two charmonium mesons. We suggest to search for such states in the $J/\\psi J/\\psi$ and $\\eta_c(1S)\\eta_c(1S)$ channels."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1803.02522","kind":"arxiv","version":2},"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"},"aliases":[{"alias_kind":"arxiv","alias_value":"1803.02522","created_at":"2026-05-18T00:07:10.512728+00:00"},{"alias_kind":"arxiv_version","alias_value":"1803.02522v2","created_at":"2026-05-18T00:07:10.512728+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1803.02522","created_at":"2026-05-18T00:07:10.512728+00:00"},{"alias_kind":"pith_short_12","alias_value":"TKA4IO3XQKBF","created_at":"2026-05-18T12:32:53.628368+00:00"},{"alias_kind":"pith_short_16","alias_value":"TKA4IO3XQKBF2YOT","created_at":"2026-05-18T12:32:53.628368+00:00"},{"alias_kind":"pith_short_8","alias_value":"TKA4IO3X","created_at":"2026-05-18T12:32:53.628368+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/TKA4IO3XQKBF2YOTRDJIVS3FVM","json":"https://pith.science/pith/TKA4IO3XQKBF2YOTRDJIVS3FVM.json","graph_json":"https://pith.science/api/pith-number/TKA4IO3XQKBF2YOTRDJIVS3FVM/graph.json","events_json":"https://pith.science/api/pith-number/TKA4IO3XQKBF2YOTRDJIVS3FVM/events.json","paper":"https://pith.science/paper/TKA4IO3X"},"agent_actions":{"view_html":"https://pith.science/pith/TKA4IO3XQKBF2YOTRDJIVS3FVM","download_json":"https://pith.science/pith/TKA4IO3XQKBF2YOTRDJIVS3FVM.json","view_paper":"https://pith.science/paper/TKA4IO3X","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1803.02522&json=true","fetch_graph":"https://pith.science/api/pith-number/TKA4IO3XQKBF2YOTRDJIVS3FVM/graph.json","fetch_events":"https://pith.science/api/pith-number/TKA4IO3XQKBF2YOTRDJIVS3FVM/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/TKA4IO3XQKBF2YOTRDJIVS3FVM/action/timestamp_anchor","attest_storage":"https://pith.science/pith/TKA4IO3XQKBF2YOTRDJIVS3FVM/action/storage_attestation","attest_author":"https://pith.science/pith/TKA4IO3XQKBF2YOTRDJIVS3FVM/action/author_attestation","sign_citation":"https://pith.science/pith/TKA4IO3XQKBF2YOTRDJIVS3FVM/action/citation_signature","submit_replication":"https://pith.science/pith/TKA4IO3XQKBF2YOTRDJIVS3FVM/action/replication_record"}},"created_at":"2026-05-18T00:07:10.512728+00:00","updated_at":"2026-05-18T00:07:10.512728+00:00"}