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Both cases have been observed: the first by studying the mass spectrum of the system recoiling against the J/psi, and the second by reconstructing the J/psi together with a charmed meson. We find cross-sections of \\sigma(e+ e- -> J/psi eta_c (gamma)) * BR (eta_c -> >=4 charged) = 0.033 (+0.007 -0.006)(stat) \\pm 0.009(syst)pb and \\sigma(e+ e- -> J/"},"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":"hep-ex/0205104","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"hep-ex","submitted_at":"2002-05-31T08:25:30Z","cross_cats_sorted":[],"title_canon_sha256":"8d985dc82881df8f398b74622e71e04700990a1244bd19cae4162f7e46321023","abstract_canon_sha256":"b6e2fd2798c6b6ff5002b8d7f83e43b51b876134fee7426445eb74dbc48e7aeb"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T15:32:11.322899Z","signature_b64":"c0xuBk5xU4BvwYwPMS1ysfCaEO2T7LG1qfFcBRrzfx0CH40MIoE26destcrwUKVgON19KCIBohlDu4jjmroODQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"3fbbeed8135ab0031003d3a3877a0f7106999410f02e6488385442cde99a6131","last_reissued_at":"2026-07-04T15:32:11.322511Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T15:32:11.322511Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Observation of Double cc bar Production in e+ e- Annihilation at sqrt{s} ~ 10.6 GeV","license":"","headline":"","cross_cats":[],"primary_cat":"hep-ex","authors_text":"et al, K.Abe, The Belle Collaboration","submitted_at":"2002-05-31T08:25:30Z","abstract_excerpt":"We report the observation of prompt J/psi via double ccbar production from the e+e- continuum. 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