{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:3AZJ7LGFHF2EMFRZSFK3N3ARKE","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":"22781fe3848b8a7a0ef124e40b18d25b08782cf5cb06188a7512dbcd0f7e5ba4","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2019-02-25T01:59:53Z","title_canon_sha256":"5a3cdd2fc202ffc62fee8f360de7c2b138c3330cc13d6e7179eec83b61b58dd5"},"schema_version":"1.0","source":{"id":"1902.09056","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1902.09056","created_at":"2026-05-17T23:42:23Z"},{"alias_kind":"arxiv_version","alias_value":"1902.09056v1","created_at":"2026-05-17T23:42:23Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1902.09056","created_at":"2026-05-17T23:42:23Z"},{"alias_kind":"pith_short_12","alias_value":"3AZJ7LGFHF2E","created_at":"2026-05-18T12:33:07Z"},{"alias_kind":"pith_short_16","alias_value":"3AZJ7LGFHF2EMFRZ","created_at":"2026-05-18T12:33:07Z"},{"alias_kind":"pith_short_8","alias_value":"3AZJ7LGF","created_at":"2026-05-18T12:33:07Z"}],"graph_snapshots":[{"event_id":"sha256:54daf7aef2be718c1f9826f2b8936f4e43728f3e47e465558a275a6fac14d94f","target":"graph","created_at":"2026-05-17T23:42:23Z","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 study the $\\eta_c$ photoproduction in $ep$ collisions in this paper. The short-distance coefficients for $c\\bar{c}(^1S_0^{[1]})$, $c\\bar{c}(^1S_0^{[8]})$, $c\\bar{c}(^3S_1^{[8]})$, and $c\\bar{c}(^1P_1^{[8]})$ photoproductions are evaluated at leading order in $\\alpha_s$ expansion, where the color-singlet contribution is achieved for the first time. We have carefully analyzed different kinematic distributions of the cross sections and found that the color-singlet contribution is considerably suppressed comparing with the color-octet parts. This feature renders the $\\eta_c$ photoproduction pro","authors_text":"Army Medical University, Astrophysics, Center of Excellence in High Energy Physics, China), Chongqing, College of Basic Medical Sciences, Economics, Guiyang, Guizhou University of Finance, Hong-Fei Zhang (College of Big Data Statistics, Nakhon Ratchasima, Southwest University, Suranaree University of Technology, Technology, Thailand), Wen-Long Sang (School of Physical Science, Yu Feng (Department of Physics, Yu-Peng Yan (School of Physics","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2019-02-25T01:59:53Z","title":"Kinematic distributions of the $\\eta_c$ photoproduction in $ep$ collisions within the nonrelativistic QCD framework"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1902.09056","kind":"arxiv","version":1},"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":"sha256:44f2423fb2c8736e9bde90a87615f8fd7bd7ba6c7a599c1822428c58bb89c2c2","target":"record","created_at":"2026-05-17T23:42:23Z","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":"22781fe3848b8a7a0ef124e40b18d25b08782cf5cb06188a7512dbcd0f7e5ba4","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2019-02-25T01:59:53Z","title_canon_sha256":"5a3cdd2fc202ffc62fee8f360de7c2b138c3330cc13d6e7179eec83b61b58dd5"},"schema_version":"1.0","source":{"id":"1902.09056","kind":"arxiv","version":1}},"canonical_sha256":"d8329facc539744616399155b6ec115121226787a7dfe859e2769ece8e9c3a7c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"d8329facc539744616399155b6ec115121226787a7dfe859e2769ece8e9c3a7c","first_computed_at":"2026-05-17T23:42:23.415013Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:42:23.415013Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"kCouMmVneWFZYzWZEkcI6jsa1ZMcbq7ni3sScoix20XTUYFKvFh7uEk2Ug+UK0UpZ9otE+6I5GdD8//lBMeRDQ==","signature_status":"signed_v1","signed_at":"2026-05-17T23:42:23.415659Z","signed_message":"canonical_sha256_bytes"},"source_id":"1902.09056","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:44f2423fb2c8736e9bde90a87615f8fd7bd7ba6c7a599c1822428c58bb89c2c2","sha256:54daf7aef2be718c1f9826f2b8936f4e43728f3e47e465558a275a6fac14d94f"],"state_sha256":"83b250ef6e9653b8aa075cc295d44e4e3a7cca09067153ad5fbf9a760a064230"}