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We measure the branching fractions Br(B- --> J/psi K- pi+ pi-) = (116 +- 7 (stat.) +- 9(syst.))* 10-5 and Br(B- --> X(3872)K-)* Br (X(3872) --> J/psi pi+ pi-) =(1.28+- 0.41)* 10-5 and find the mass of the X(3872) to be 3873.4 +- 1.4 MeV/c2. We search for the h_c narrow state in the decay B- --> h_c K-, h_c --> J/psi pi+ pi- and for the decay B- --> J/psi D0 pi-, with D0 --> K- pi+. We set the 90% C.L. limits Br(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":"hep-ex/0406022","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"hep-ex","submitted_at":"2004-06-07T13:03:10Z","cross_cats_sorted":[],"title_canon_sha256":"6aa930d4aa5454b37fde79efd3dfa371e0c588445f70d630028d716390fa45ba","abstract_canon_sha256":"732fc3048c6f83099966db2071cc305aeea976c6f38174f45342d458ca26d621"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T15:31:29.250954Z","signature_b64":"rr17eFmmeXZTB+RLNjrNMrC8stn2PLcBRWlF/J3cHqx/z1axQwnwAjb/QxjDnMuPYNSdXlhjM74yNm5+vUqdAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c112eea1c97022dead0110d3ba501035d622aedf1f12624c6f0e3d4ea27edd9b","last_reissued_at":"2026-07-04T15:31:29.250529Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T15:31:29.250529Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Study of the B- --> J/psi K- pi+ pi- Decay and Measurement of the B- --> X(3872) K- Branching Fraction","license":"","headline":"","cross_cats":[],"primary_cat":"hep-ex","authors_text":"BABAR Collaboration, B.Aubert, et al","submitted_at":"2004-06-07T13:03:10Z","abstract_excerpt":"We study the decay B- --> J/psi K- pi+ pi- using 117 million BBbar events collected at the Y(4S) resonance with the BaBar detector at the PEP-II e+ e- asymmetric-energy storage ring. 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