Electromagnetic transitions in an effective chiral Lagrangian with the eta ' and light vector mesons
2012 (English)In: European Physical Journal A, ISSN 1434-6001, E-ISSN 1434-601X, Vol. 48, no 12, 190- p.Article in journal (Refereed) Published
We consider the chiral Lagrangian with a nonet of Goldstone bosons and a nonet of light vector mesons. The mixing between the pseudoscalar mesons eta and eta' is taken into account. A novel counting scheme is suggested that is based on hadrogenesis, which conjectures a mass gap in the meson spectrum of QCD in the limit of a large number of colors. Such a mass gap would justify to consider the vector mesons and the eta' meson as light degrees of freedom. The complete leading-order Lagrangian is constructed and discussed. As a first application it is tested against electromagnetic transitions of light vector mesons to pseudoscalar mesons. Our parameters are determined by the experimental data on photon decays of the omega, phi and eta' mesons. In terms of such parameters we predict the corresponding decays into virtual photons with either dielectrons or dimuons in the final state.
Place, publisher, year, edition, pages
2012. Vol. 48, no 12, 190- p.
IdentifiersURN: urn:nbn:se:uu:diva-194230DOI: 10.1140/epja/i2012-12190-6ISI: 000313165300015OAI: oai:DiVA.org:uu-194230DiVA: diva2:604954