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In this note we attempt an estimate of the transition rate, \\Gamma_{\\rm rad}, by a non-relativistic calculation of the electric dipole term of a diquarkonium bound state. We compute \\Gamma_{\\rm rad} for generic composition values of the isospin of X and Y. Specializing to I=0 for X(3872), we find \\Gamma_{\\rm rad}= 496~keV for Y(4260) with I=0 and \\Gamma_{\\rm rad}= 179~keV for I=1. Combining with BESIII data, we derive upper bounds to B(Y\\to J/\\Psi+\\pi+\\pi) and t"},"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":"1510.03626","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2015-10-13T11:21:14Z","cross_cats_sorted":[],"title_canon_sha256":"822af81f2b4257532bf8d57587629aa758464786b75fcf948f2d71dc0c9a20ad","abstract_canon_sha256":"30c8ebec4a2d0fb02891ac5506e68385c39f3c34b52d9c7975ac22c03cb1ff4f"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:22:35.428353Z","signature_b64":"TtwS7pjSHs0LQISCsNVzeexndruQA5SbqfQbv3sugngGztanC0oiwZ+wAtBNtVVZ0FPgELXFVyaJlUQqWTAvCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"bc41d583901c27873d91e4e2c7de928cae15d2ad54e15681b4e2c94242489b5a","last_reissued_at":"2026-05-18T01:22:35.427650Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:22:35.427650Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Y(4260) --> gamma + X(3872) in the diquarkonium picture","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"hep-ph","authors_text":"A.D. Polosa, H.-X. Chen, L. Maiani, V. Riquer","submitted_at":"2015-10-13T11:21:14Z","abstract_excerpt":"The observed Y(4260)\\to \\gamma + X(3872) decay is a natural consequence of the diquark-antidiquark description of Y and X resonances. In this note we attempt an estimate of the transition rate, \\Gamma_{\\rm rad}, by a non-relativistic calculation of the electric dipole term of a diquarkonium bound state. We compute \\Gamma_{\\rm rad} for generic composition values of the isospin of X and Y. Specializing to I=0 for X(3872), we find \\Gamma_{\\rm rad}= 496~keV for Y(4260) with I=0 and \\Gamma_{\\rm rad}= 179~keV for I=1. 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