Testing lepton flavor universality in ϒ ( 4 S ) decays

The authors propose to test lepton flavor universality, for which there are hints of violations from ratios of exclusive semileptonic $B$ decays, the so-called $B$-decay anomalies, with inclusive dilepton decays of $\mathrm{\ensuremath{\Upsilon}}(4S)$. For this, they relate, with appropriate cuts for the LHCb and Belle II experiments, ratios of dilepton decays rates of $\mathrm{\ensuremath{\Upsilon}}(4S)$ to the anomalous ratios of semileptonic $B$ decays.