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We suggest some means of producing and observing $Q_1 Q_2 \\bar Q_3 \\bar Q_4$ resonant states, concentrating on the $c c \\bar c \\bar c$ channel which is most easily produced and the $b b \\bar b \\bar b$ channel which has a better chance of being relatively narrow. We obtain $M_{(cc)(\\bar c \\bar c)} = 6,192 \\pm 25$ MeV and $M_{(bb)(\\bar b \\bar b)} = 18,826 \\pm 25$ MeV, for the charmed "},"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":"1611.00348","kind":"arxiv","version":6},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2016-11-01T19:40:37Z","cross_cats_sorted":["hep-ex"],"title_canon_sha256":"8c36ac9b5e4cd239030bd532fe1365e1684a54ff597f06c9789d8c65b31db057","abstract_canon_sha256":"a9816d22815ccbc1797280d84685cb2486ea5b0dfa665cb5945bdd064f8c61ee"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:50:18.360745Z","signature_b64":"4yybuFEL4bBuhtfRU7os+wdgXBYDqJJsc3q4bina7ofjCQ2/4bSLxg31vb6ZZKpMIuvj3sbwkGqcqYQrTl5xAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"22dc16b18a0ea2f3212a835f6dec3babb119d999cf27d6eeea63acd406806d6d","last_reissued_at":"2026-05-18T00:50:18.360282Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:50:18.360282Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"$Q Q \\bar Q \\bar Q$ states: masses, production, and decays","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-ex"],"primary_cat":"hep-ph","authors_text":"Jonathan L. Rosner, Marek Karliner, Shmuel Nussinov","submitted_at":"2016-11-01T19:40:37Z","abstract_excerpt":"The question of whether there exist bound states of two heavy quarks $Q=(c,b)$ and antiquarks $\\bar Q = (\\bar c, \\bar b)$, distinct from a pair of quark-antiquark mesons, has been debated for more than forty years. We suggest some means of producing and observing $Q_1 Q_2 \\bar Q_3 \\bar Q_4$ resonant states, concentrating on the $c c \\bar c \\bar c$ channel which is most easily produced and the $b b \\bar b \\bar b$ channel which has a better chance of being relatively narrow. 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