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We determine the mass to be M_X(3872)= (3871.84\\pm 0.27 (stat)\\pm 0.19 (syst)) MeV, a 90% CL upper limit on the natural width of Gamma_X(3872)<1.2 MeV, the product branching fraction Bf(B+-> K+X(3872))xBf(X(3872)-->pi+pi-J/psi)=(8.61 \\pm 0.82(stat) \\pm 0.52 (syst)) x10^{-6}, and a ratio of branching fractions Bf(B0--> K0 X(3872))/BF(B+--> K+ X(3872))=0.50\\pm 0.14(stat)\\pm0.04(syst). The difference in mass between the X(3872)-->pi+pi-J/psi signals in B+ and B0 decays is Delta M_{X(38"},"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":"1107.0163","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ex","submitted_at":"2011-07-01T09:29:36Z","cross_cats_sorted":[],"title_canon_sha256":"30b22df85a9649fba9befc4ce5d13d0524a97185d003d26f23b0b23dcf0428c1","abstract_canon_sha256":"73fc77719c4592c648a345e3106d5f8a8bd4172269037c6781c400a1ad5dfe1e"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:23:23.645063Z","signature_b64":"VMc7B9rfcG41uuQR5erW5IxZKar7bbn3Mgp6i14Bt3HxVyc1bGYWRWScToo1VmVOVUubEYw7TnMVePuKiE/tAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"0c881d99924fab9204d08d838f2b1c21c5a0508a74b19afdf43466c27407798e","last_reissued_at":"2026-05-18T03:23:23.644422Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:23:23.644422Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Bounds on the width, mass difference and other properties of X(3872) --> pi+pi-J/psi decays","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"hep-ex","authors_text":"et al (Belle Collaboration), K. Trabelsi, S.-K. Choi, S.L. Olsen","submitted_at":"2011-07-01T09:29:36Z","abstract_excerpt":"We present results from a study of X(3872) --> pi+pi- J/psi decays produced via exclusive B--> K X(3872) decays. We determine the mass to be M_X(3872)= (3871.84\\pm 0.27 (stat)\\pm 0.19 (syst)) MeV, a 90% CL upper limit on the natural width of Gamma_X(3872)<1.2 MeV, the product branching fraction Bf(B+-> K+X(3872))xBf(X(3872)-->pi+pi-J/psi)=(8.61 \\pm 0.82(stat) \\pm 0.52 (syst)) x10^{-6}, and a ratio of branching fractions Bf(B0--> K0 X(3872))/BF(B+--> K+ X(3872))=0.50\\pm 0.14(stat)\\pm0.04(syst). 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