{"paper":{"title":"Exchange Current Operators and Electromagnetic Dipole Transitions in Heavy Quarkonia","license":"","headline":"","cross_cats":[],"primary_cat":"hep-ph","authors_text":"Helsinki U.), T.A. Lahde (Helsinki Inst. of Phys.","submitted_at":"2002-08-12T09:54:05Z","abstract_excerpt":"The electromagnetic E1 and M1 transitions in heavy quarkonia ($c\\bar c$, $b\\bar b$, $c\\bar b$) and the magnetic moment of the $B_c^\\pm$ are calculated within the framework of the covariant Blankenbecler-Sugar (BSLT) equation. The aim of this paper is to study the effects of two-quark exchange current operators which involve the $Q\\bar Q$ interaction, that arise in the BSLT (or Schr\\\"odinger) reduction of the Bethe-Salpeter equation. These are found to be small for E1 dominated decays such as $\\psi(nS)\\to \\chi_{cJ} \\gamma$ and $\\Upsilon(nS)\\to \\chi_{bJ} \\gamma$, but significant for the M1 domin"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"hep-ph/0208110","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}