Comment on "Improved measurement of $\eta /{\eta }^{\prime }$ mixing in $B_{(s)}^0\to J/\psi {\eta }^{(\prime )}$ decays"

Abstract

Instead of the glueball-${\eta }^{\prime }$ mixing ansatz, the latest measured ratios of the branching fractions of $B_{(s)}^0\to J/\psi {\eta }^{(\prime )}$ decays by LHCb can be understood by including the contribution from the light quark annihilation effect enhanced by the QCD ${\mathrm{U}}_A(1)$ anomaly for light pseudoscalar mesons.

Comments: Comment on arXiv:2507.13914