Vector-meson production and vector meson dominance
Jul 7, 2021
12 pages
Published in:
- Eur.Phys.J.C 81 (2021) 10, 895,
- Eur.Phys.J.C 81 (2021) 895
- Published: Oct 11, 2021
e-Print:
- 2107.03488 [hep-ph]
Report number:
- NJU-INP 044/21
View in:
Citations per year
Abstract: (Springer)
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.Note:
- 12 pages, 2 figures, 2 tables
- vector meson: production
- meson: heavy
- vector meson: heavy
- photon: vacuum polarization
- pentaquark: production
- p: mass
- photon quark: vertex
- meson dominance
- momentum dependence
- electron p
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