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A contact interaction model for the η and η' mesons in a SDE-BSE approach to QCD: masses, decay widths and transition form factors

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arxiv 2304.14887 v1 pith:WBZE2MKS submitted 2023-04-28 hep-ph nucl-th

A contact interaction model for the $\eta$ and $\eta'$ mesons in a SDE-BSE approach to QCD: masses, decay widths and transition form factors

classification hep-ph nucl-th
keywords contactdecayfactorsforminteractionmesonsmodeltransition
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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abstract

We construct a contact interaction model for the $\eta$ and $\eta'$ mesons in the SDE-BSE approach to QCD and compute several static properties of these mesons and their transition form factors. We find that this model gives an excellent description of the $\eta$ and $\eta'$ static properties, namely their masses, decay width and decay constants. However, a contact interaction disagrees with experimental data for $Q^2$ greater than 2 GeV$^2$, and produces transition form factors in conflict with perturbative QCD prediction. This is not surpring and the reasons for this are explained

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    nucl-th 2026-04 unverdicted novelty 4.0

    A Poincaré-covariant vector-vector contact interaction yields an equation of state for strange quark matter whose mass-radius and tidal properties match pulsar and gravitational-wave constraints for two tuned parameter sets.