Year: 2025
Type: article
Abstract: Within the Bethe–Salpeter framework, we present a computation of space-like electromagnetic form factors for pseudoscalar mesons, including light and heavy-light systems. Our approach employs a flavour-dependent variation of the standard Taylor effective charge, which contains key contributions from the quark-gluon vertices. This effective interaction is a common ingredient of all relevant dynamical equations, and accommodates the crucial mass differences between the various quark flavours. Particular attention is paid to the nonperturbative determination of the quark-photon vertex. The computed electromagnetic form factors for the pion and the kaon mesons show excellent agreement with experimental determinations. In addition, the predictions for the charge radii of heavy-light systems are in overall good agreement with lattice QCD.
Source: The European Physical Journal C
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: diamond
Funders: Ministerio de Ciencia, Innovación y Universidades, Deutsche Forschungsgemeinschaft, Generalitat Valenciana, Ministerio de Ciencia e Innovación, Emberi Eroforrások Minisztériuma, Agencia Estatal de Investigación, Conselleria de Innovación, Universidades, Ciencia y Sociedad Digital, Generalitat Valenciana, ExtreMe Matter Institute, GSI Helmholtzzentrum für Schwerionenforschung
Awards: G1170463422, G1570660777, G1610934229, G1867490183, G2185543607, G2687764989, G2917513873, G3176647223, G3344334000, G4014979219, G4511208782, G464105488, G5033054449, G5071833386, G5222023348, G5805502524, G6526081583, G6731524417, EXC 2181: STRUKTUREN: Emergenz in Natur, Mathematik und komplexen Daten, G714608666, G7299807396, G7563990732, G8181629089, G8269025138, G8302083189, SFB 1225: Isolierte Quantensysteme und Universalität unter extremen Bedingungen (ISOQUANT), G948230370
OpenAlex ID: W4417082282