Regular Article - Theoretical Physics
Vector-meson production and vector meson dominance
School of Physics, Nanjing University, 210093, Nanjing, Jiangsu, China
2 Institute for Nonperturbative Physics, Nanjing University, 210093, Nanjing, Jiangsu, China
3 European Centre for Theoretical Studies in Nuclear Physics and Related Areas, Villa Tambosi, Strada delle Tabarelle 286, 38123, Villazzano (TN), Italy
Accepted: 16 September 2021
Published online: 11 October 2021
We consider the fidelity of the vector meson dominance (VMD) assumption as an instrument for relating the electromagnetic vector-meson production reaction to the purely hadronic process . Analyses of the photon vacuum polarisation and the photon-quark vertex reveal that such a VMD Ansatz might be reasonable for light vector-mesons. However, when the vector-mesons are described by momentum-dependent bound-state amplitudes, VMD fails for heavy vector-mesons: it cannot be used reliably to estimate either a photon-to-vector-meson transition strength or the momentum dependence of those integrands that would arise in calculations of the different reaction amplitudes. Consequently, for processes involving heavy mesons, the veracity of both cross-section estimates and conclusions based on the VMD assumption should be reviewed, e.g., those relating to hidden-charm pentaquark production and the origin of the proton mass.
© The Author(s) 2021
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