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HFLAV $τ$ branching fractions fit and measurements of Vus with $τ$ lepton data

We report the status of the Heavy Flavour Averaging Group (HFLAV) averages of the $τ$ lepton measurements We then update the latest published HFLAV global fit of the $τ$ lepton branching fractions (Spring 2017) with recent results by BABAR. We use the fit results to update the Cabibbo-Kobayashi-Maskawa (CKM) matrix element Vus measurements with the $τ$ branching fractions. We combine the direct $τ$ branching fraction measurements with indirect predictions using kaon branching fractions measurements to improve the determination of Vus using $τ$ branching fractions. The Vus determinations based on the inclusive branching fraction of $τ$ to strange final states are about $3σ$ lower than the Vus determination from the CKM matrix unitarity.

preprint2019arXivOpen access
Alberto Lusiani
hep-exhep-ph
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Alberto Lusiani

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