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

TL;DR

This paper discusses how recent LHCb measurements of certain B meson decays can be explained by considering light quark annihilation effects enhanced by the QCD U_A(1) anomaly, challenging previous glueball-$\

Contribution

It introduces a new interpretation of decay ratios that accounts for light quark annihilation effects, moving beyond the glueball-$\

Findings

Branching ratio measurements align with light quark annihilation effects.

QCD U_A(1) anomaly significantly influences pseudoscalar meson decays.

Challenges previous glueball-$\

Abstract

Instead of the glueball-$\eta'$ 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.