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We calculate the widths of the strong decays $Z_c^+ \\to J/\\psi \\pi^+$ ($\\eta_c\\rho^+$, $\\bar D^0D^{\\ast\\,+}$, $\\bar D^{\\ast\\,0}D^+$), $Z(4430)^+ \\to J/\\psi \\pi^+$ ($\\psi(2s) \\pi^+$), and $X^+_b\\to B_s\\pi^+$ within a covariant quark model previously developed by us. We find that the tetraquark-type current widely used in the literature for the $Z_c(3900)$ leads to a significant suppression of the $\\bar D D^\\ast$ and $\\bar D^\\ast D$ modes. Contrary to this a molecular-type curre"},"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":"1608.04656","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2016-08-16T16:19:39Z","cross_cats_sorted":[],"title_canon_sha256":"229a2597c2d5f78eb91ed7e8a0db0b9060394aaa2713d51b58df5a181abdc3af","abstract_canon_sha256":"74f67b905708fa51ed0efac562eb5acb38a3fa1ffdd5d5d692e30136f4c01c9e"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:58:50.908878Z","signature_b64":"t8BjG/ckBjyyxa+jnXqEZjpwD+hazbloIHAjAwwpBbrlRWKH5MgSfb6f0qH5MQBf+DCld+pCH/sGAPBS4AuyCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"6b1d07cbcd8a1e2c0ded74c8dbe7a10b92cfd71df7990a2ce81c418f647783a8","last_reissued_at":"2026-05-18T00:58:50.908367Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:58:50.908367Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Four-quark structure of Zc(3900), Z(4430) and Xb(5568) states","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"hep-ph","authors_text":"Fabian Goerke, Jurgen G. 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