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Both A0 and chi are assumed to have zero spin. We tag Upsilon(1S) decays with a dipion transition Upsilon(2S)->pi+pi-Upsilon(1S) and look for events with a single energetic photon and significant missing energy. We find no evidence for such processes in the mass range m_A0<=9.2 GeV and m_chi<=4.5 GeV in the sample of 98e6 Upsilon(2S) decays collected with the B"},"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":"1007.4646","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ex","submitted_at":"2010-07-27T09:20:12Z","cross_cats_sorted":[],"title_canon_sha256":"621e499fc02b54a02fcc132cc8eca3a200c249e95a988a37487188ad9d31bed7","abstract_canon_sha256":"eb8b5985f129f2dbecfe8b94b852c9d2c71f6c08b90ad43613c8a0ba17c8bad0"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:16:42.276079Z","signature_b64":"k8bKUvftiLHmZ5wz0R8fAl3cwgfIyNXPxwAYh4281VI6EivF2mfErMou0O0wV8GpoZRoyDZ6yD6EGCzkRNE3Dg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"693bb49e245a0282c571fd58bea6d1f7cc8f28b6c6870d228bf9e65d35625b31","last_reissued_at":"2026-05-18T04:16:42.275471Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:16:42.275471Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Search for Production of Invisible Final States in Single-Photon Decays of Upsilon(1S)","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"hep-ex","authors_text":"et al (The BABAR Collaboration), P. 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