{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2018:MIXL2XMU5MMJZALSTERHO4LKSN","short_pith_number":"pith:MIXL2XMU","schema_version":"1.0","canonical_sha256":"622ebd5d94eb189c8172992277716a9340f8f331ab8dbef5895fe6532cded2e3","source":{"kind":"arxiv","id":"1812.02549","version":4},"attestation_state":"computed","paper":{"title":"On the massless tree-level S-matrix in 2d sigma models","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"hep-th","authors_text":"Arkady A. Tseytlin, Ben Hoare, Nat Levine","submitted_at":"2018-12-06T14:29:46Z","abstract_excerpt":"Motivated by the search for new integrable string models, we study the properties of massless tree-level S-matrices for 2d sigma models expanded near the trivial vacuum. We find that, in contrast to the standard massive case, there is no apparent link between massless S-matrices and integrability: in well-known integrable models the tree-level massless S-matrix fails to factorize and exhibits particle production. Such tree-level particle production is found in several classically integrable models: the principal chiral model, its classically equivalent \"pseudo-dual\" model, its non-abelian dual"},"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":"1812.02549","kind":"arxiv","version":4},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-th","submitted_at":"2018-12-06T14:29:46Z","cross_cats_sorted":[],"title_canon_sha256":"2290d351416408d036adf744eeb8b2168df5360afd97765526ff1d3d169fc346","abstract_canon_sha256":"5cb701404df8427e3ccceaac8db26cb133e110545b33ea9da70a7b9723e9e8b0"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:46:09.311691Z","signature_b64":"J6BkX+BKMO+kiR3JdNa5Dm+S1OwHapYvgHiNbvjUN1BmX2rFP3fYCt3mSIuBN4r9MXRIasL0whKVA9tSEBFiAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"622ebd5d94eb189c8172992277716a9340f8f331ab8dbef5895fe6532cded2e3","last_reissued_at":"2026-05-17T23:46:09.311212Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:46:09.311212Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"On the massless tree-level S-matrix in 2d sigma models","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"hep-th","authors_text":"Arkady A. Tseytlin, Ben Hoare, Nat Levine","submitted_at":"2018-12-06T14:29:46Z","abstract_excerpt":"Motivated by the search for new integrable string models, we study the properties of massless tree-level S-matrices for 2d sigma models expanded near the trivial vacuum. We find that, in contrast to the standard massive case, there is no apparent link between massless S-matrices and integrability: in well-known integrable models the tree-level massless S-matrix fails to factorize and exhibits particle production. Such tree-level particle production is found in several classically integrable models: the principal chiral model, its classically equivalent \"pseudo-dual\" model, its non-abelian dual"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1812.02549","kind":"arxiv","version":4},"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":"1812.02549","created_at":"2026-05-17T23:46:09.311267+00:00"},{"alias_kind":"arxiv_version","alias_value":"1812.02549v4","created_at":"2026-05-17T23:46:09.311267+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1812.02549","created_at":"2026-05-17T23:46:09.311267+00:00"},{"alias_kind":"pith_short_12","alias_value":"MIXL2XMU5MMJ","created_at":"2026-05-18T12:32:37.024351+00:00"},{"alias_kind":"pith_short_16","alias_value":"MIXL2XMU5MMJZALS","created_at":"2026-05-18T12:32:37.024351+00:00"},{"alias_kind":"pith_short_8","alias_value":"MIXL2XMU","created_at":"2026-05-18T12:32:37.024351+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/MIXL2XMU5MMJZALSTERHO4LKSN","json":"https://pith.science/pith/MIXL2XMU5MMJZALSTERHO4LKSN.json","graph_json":"https://pith.science/api/pith-number/MIXL2XMU5MMJZALSTERHO4LKSN/graph.json","events_json":"https://pith.science/api/pith-number/MIXL2XMU5MMJZALSTERHO4LKSN/events.json","paper":"https://pith.science/paper/MIXL2XMU"},"agent_actions":{"view_html":"https://pith.science/pith/MIXL2XMU5MMJZALSTERHO4LKSN","download_json":"https://pith.science/pith/MIXL2XMU5MMJZALSTERHO4LKSN.json","view_paper":"https://pith.science/paper/MIXL2XMU","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1812.02549&json=true","fetch_graph":"https://pith.science/api/pith-number/MIXL2XMU5MMJZALSTERHO4LKSN/graph.json","fetch_events":"https://pith.science/api/pith-number/MIXL2XMU5MMJZALSTERHO4LKSN/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/MIXL2XMU5MMJZALSTERHO4LKSN/action/timestamp_anchor","attest_storage":"https://pith.science/pith/MIXL2XMU5MMJZALSTERHO4LKSN/action/storage_attestation","attest_author":"https://pith.science/pith/MIXL2XMU5MMJZALSTERHO4LKSN/action/author_attestation","sign_citation":"https://pith.science/pith/MIXL2XMU5MMJZALSTERHO4LKSN/action/citation_signature","submit_replication":"https://pith.science/pith/MIXL2XMU5MMJZALSTERHO4LKSN/action/replication_record"}},"created_at":"2026-05-17T23:46:09.311267+00:00","updated_at":"2026-05-17T23:46:09.311267+00:00"}