{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:GVYRAVJXRWRNYKJIVLWCODD3DI","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"f740de3de2036cd09a3ac05b189c98c4ee160b04999fa09c3c889048ad838f3a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2013-05-09T03:10:32Z","title_canon_sha256":"fe24fb1d541266269721af827152f2a44362eb625ba94f38cdb9142bcb470fbc"},"schema_version":"1.0","source":{"id":"1305.1997","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1305.1997","created_at":"2026-05-18T03:19:43Z"},{"alias_kind":"arxiv_version","alias_value":"1305.1997v2","created_at":"2026-05-18T03:19:43Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1305.1997","created_at":"2026-05-18T03:19:43Z"},{"alias_kind":"pith_short_12","alias_value":"GVYRAVJXRWRN","created_at":"2026-05-18T12:27:45Z"},{"alias_kind":"pith_short_16","alias_value":"GVYRAVJXRWRNYKJI","created_at":"2026-05-18T12:27:45Z"},{"alias_kind":"pith_short_8","alias_value":"GVYRAVJX","created_at":"2026-05-18T12:27:45Z"}],"graph_snapshots":[{"event_id":"sha256:b141d1c302a38178d5bd8cc699321d318960ed2895a1ee19cbb91e6e3b38fce6","target":"graph","created_at":"2026-05-18T03:19:43Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"We investigate in detail the role of heavy meson loops in the transition from $J^{PC}=1^{--}$ sources to candidates for QCD \"exotics\", such as $Z_c(3900)$, $Z_b(10610)$ and $Z_b'(10650)$. We demonstrate that, if a vector state strongly couples to a heavy meson pair in an $S$--wave and this system decays to another heavy meson pair (e.g. via pion emission), again in an $S$-wave, the pertinent diagrams get enhanced significantly, if the intermediate states are (near) on--shell and have small relative momenta. In a limited kinematic range this mechanism generates \"singularity regions\" that lead t","authors_text":"Christoph Hanhart, Qiang Zhao, Qian Wang","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2013-05-09T03:10:32Z","title":"Systematic study of the singularity mechanism in heavy quarkonium decays"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1305.1997","kind":"arxiv","version":2},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:53fcb0b7d5628d448c2517a7ef0ae2a16341a4dcd46e44fced544cd27cc25e48","target":"record","created_at":"2026-05-18T03:19:43Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"f740de3de2036cd09a3ac05b189c98c4ee160b04999fa09c3c889048ad838f3a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2013-05-09T03:10:32Z","title_canon_sha256":"fe24fb1d541266269721af827152f2a44362eb625ba94f38cdb9142bcb470fbc"},"schema_version":"1.0","source":{"id":"1305.1997","kind":"arxiv","version":2}},"canonical_sha256":"35711055378da2dc2928aaec270c7b1a3c2d7569fadc60ad6f743a00138d0cef","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"35711055378da2dc2928aaec270c7b1a3c2d7569fadc60ad6f743a00138d0cef","first_computed_at":"2026-05-18T03:19:43.721936Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:19:43.721936Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"4HDXRaPlY/i5WxWEX7D9UKtRg4w/p0J6kqPlkMCWMJ4qsiU8qWvCiuEHWnHFVAZ9bgC1MgNVkIJ/oXEFGx9RCw==","signature_status":"signed_v1","signed_at":"2026-05-18T03:19:43.722642Z","signed_message":"canonical_sha256_bytes"},"source_id":"1305.1997","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:53fcb0b7d5628d448c2517a7ef0ae2a16341a4dcd46e44fced544cd27cc25e48","sha256:b141d1c302a38178d5bd8cc699321d318960ed2895a1ee19cbb91e6e3b38fce6"],"state_sha256":"a432f072ea1f8510cad8ac801ce5b43c8d3fa1f654aee61104cad2cb0284bc0f"}