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We find 446^{+58}_{-56} events of the decay  B+ -> Dbar*0 tau+ nu_tau with a significance of 8.1 standard deviations, and 146^{+42}_{-41} events of the decay B+ -> Dbar0 tau+ nu_tau with a significance of 3.5 standard deviations. The latter signal provides the first evidence for this decay mode. The measured branching fractions are  B(B+ -> Dbar*0 tau+ nu_tau)=(2.12^{+0.28}_{-0.27} ("},"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":"1005.2302","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ex","submitted_at":"2010-05-13T11:22:22Z","cross_cats_sorted":[],"title_canon_sha256":"bc7d50e4464d4daf5e3166a5f4618050d5e460116bd4e637417d89d111e4636f","abstract_canon_sha256":"eac792953c6cc4e54ecce474e34757769c9559f6a165c299220e03312061483a"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:33:26.457789Z","signature_b64":"7FaV2C2P65+aBeiuebRDMmuH3Dn5trl3g/2q1N69yRffCsmRG1924C8IcvNvtKqZ3DQ5UQLRKiNYKIvLdcJpAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"1ecc9918ecd460d1ae28752b1fcc0aa293d5671e07ee5be08736d3a331cf99ff","last_reissued_at":"2026-05-18T02:33:26.457390Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:33:26.457390Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Observation of B+ -> Dbar*0 tau+ nu_tau and Evidence for B+ -> Dbar^0 tau+ nu_tau at Belle","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"hep-ex","authors_text":"A.Bozek, M.Rozanska et al. 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