{"paper":{"title":"Radiative resonance couplings in $\\gamma\\pi\\to\\pi\\pi$","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-ex","nucl-th"],"primary_cat":"hep-ph","authors_text":"Bastian Kubis, Martin Hoferichter, Marvin Zanke","submitted_at":"2017-10-02T18:00:01Z","abstract_excerpt":"Studies of the reaction $\\gamma\\pi\\to\\pi\\pi$, in the context of the ongoing Primakoff program of the COMPASS experiment at CERN, give access to the radiative couplings of the $\\rho(770)$ and $\\rho_3(1690)$ resonances. We provide a vector-meson-dominance estimate of the respective radiative width of the $\\rho_3$, $\\Gamma_{\\rho_3\\to\\pi\\gamma}=48(18)$ keV, as well as its impact on the $F$-wave in $\\gamma\\pi\\to\\pi\\pi$. For the $\\rho(770)$, we establish the formalism necessary to extract its radiative coupling directly from the residue of the resonance pole by analytic continuation of the $\\gamma\\p"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1710.00824","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"}