{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2018:V5XLTY7JQHAK7VVP4MIHYWHDZH","short_pith_number":"pith:V5XLTY7J","schema_version":"1.0","canonical_sha256":"af6eb9e3e981c0afd6afe3107c58e3c9f6ea4dc9830e6837e40950f9629a2323","source":{"kind":"arxiv","id":"1803.05744","version":2},"attestation_state":"computed","paper":{"title":"First search for invisible decays of ortho-positronium confined in a vacuum cavity","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.ins-det"],"primary_cat":"hep-ex","authors_text":"A. Rubbia, C. Vigo, L. Gerchow, L. Liszkay, P. Crivelli","submitted_at":"2018-03-15T13:39:41Z","abstract_excerpt":"The experimental setup and results of the first search for invisible decays of ortho-positronium (o-Ps) confined in a vacuum cavity are reported. No evidence of invisible decays at a level $\\text{Br}\\left(\\text{o-Ps}\\to\\text{invisible}\\right) < 5.9\\times 10^{-4}$ (90% C. L.) was found. This decay channel is predicted in Hidden Sector models such as the Mirror Matter (MM), which could be a candidate for Dark Matter. Analyzed within the MM context, this result provides an upper limit on the kinetic mixing strength between ordinary and mirror photons of $\\epsilon < 3.1 \\times 10^{-7}$ (90% C. L.)"},"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":"1803.05744","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ex","submitted_at":"2018-03-15T13:39:41Z","cross_cats_sorted":["physics.ins-det"],"title_canon_sha256":"c3b31f16a605ec5642d82b09b34757f85ff8c9b2d930a6b58e9fe19e7775f552","abstract_canon_sha256":"ebf62782a367d3acaa56ffbfccebc657f59fc0b30e36e94eb77a89e376e4fae6"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:14:08.150621Z","signature_b64":"QGRhFGtHtfWOknngal+W3BaT8/UnH30EpOIKBNFfdZvj1oDdYlEEs/CpSIcVq/85VM82BiSXnycVgyWEyuzaCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"af6eb9e3e981c0afd6afe3107c58e3c9f6ea4dc9830e6837e40950f9629a2323","last_reissued_at":"2026-05-18T00:14:08.149949Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:14:08.149949Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"First search for invisible decays of ortho-positronium confined in a vacuum cavity","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.ins-det"],"primary_cat":"hep-ex","authors_text":"A. Rubbia, C. Vigo, L. Gerchow, L. Liszkay, P. Crivelli","submitted_at":"2018-03-15T13:39:41Z","abstract_excerpt":"The experimental setup and results of the first search for invisible decays of ortho-positronium (o-Ps) confined in a vacuum cavity are reported. No evidence of invisible decays at a level $\\text{Br}\\left(\\text{o-Ps}\\to\\text{invisible}\\right) < 5.9\\times 10^{-4}$ (90% C. L.) was found. This decay channel is predicted in Hidden Sector models such as the Mirror Matter (MM), which could be a candidate for Dark Matter. Analyzed within the MM context, this result provides an upper limit on the kinetic mixing strength between ordinary and mirror photons of $\\epsilon < 3.1 \\times 10^{-7}$ (90% C. L.)"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1803.05744","kind":"arxiv","version":2},"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":"1803.05744","created_at":"2026-05-18T00:14:08.150046+00:00"},{"alias_kind":"arxiv_version","alias_value":"1803.05744v2","created_at":"2026-05-18T00:14:08.150046+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1803.05744","created_at":"2026-05-18T00:14:08.150046+00:00"},{"alias_kind":"pith_short_12","alias_value":"V5XLTY7JQHAK","created_at":"2026-05-18T12:32:59.047623+00:00"},{"alias_kind":"pith_short_16","alias_value":"V5XLTY7JQHAK7VVP","created_at":"2026-05-18T12:32:59.047623+00:00"},{"alias_kind":"pith_short_8","alias_value":"V5XLTY7J","created_at":"2026-05-18T12:32:59.047623+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/V5XLTY7JQHAK7VVP4MIHYWHDZH","json":"https://pith.science/pith/V5XLTY7JQHAK7VVP4MIHYWHDZH.json","graph_json":"https://pith.science/api/pith-number/V5XLTY7JQHAK7VVP4MIHYWHDZH/graph.json","events_json":"https://pith.science/api/pith-number/V5XLTY7JQHAK7VVP4MIHYWHDZH/events.json","paper":"https://pith.science/paper/V5XLTY7J"},"agent_actions":{"view_html":"https://pith.science/pith/V5XLTY7JQHAK7VVP4MIHYWHDZH","download_json":"https://pith.science/pith/V5XLTY7JQHAK7VVP4MIHYWHDZH.json","view_paper":"https://pith.science/paper/V5XLTY7J","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1803.05744&json=true","fetch_graph":"https://pith.science/api/pith-number/V5XLTY7JQHAK7VVP4MIHYWHDZH/graph.json","fetch_events":"https://pith.science/api/pith-number/V5XLTY7JQHAK7VVP4MIHYWHDZH/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/V5XLTY7JQHAK7VVP4MIHYWHDZH/action/timestamp_anchor","attest_storage":"https://pith.science/pith/V5XLTY7JQHAK7VVP4MIHYWHDZH/action/storage_attestation","attest_author":"https://pith.science/pith/V5XLTY7JQHAK7VVP4MIHYWHDZH/action/author_attestation","sign_citation":"https://pith.science/pith/V5XLTY7JQHAK7VVP4MIHYWHDZH/action/citation_signature","submit_replication":"https://pith.science/pith/V5XLTY7JQHAK7VVP4MIHYWHDZH/action/replication_record"}},"created_at":"2026-05-18T00:14:08.150046+00:00","updated_at":"2026-05-18T00:14:08.150046+00:00"}