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 $\tau$ lepton measurements We then update the latest published HFLAV global fit of the $\tau$ lepton branching fractions (Spring 2017) with recent results by BABAR. We use the fit results to update the Cabibbo-Kobay...
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| Format: | Article |
| Language: | English |
| Published: |
SciPost
2019-02-01
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| Series: | SciPost Physics Proceedings |
| Online Access: | https://scipost.org/SciPostPhysProc.1.001 |
| Summary: | We report the status of the Heavy Flavour Averaging Group (HFLAV) averages of
the $\tau$ lepton measurements We then update the latest published HFLAV global
fit of the $\tau$ 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 $\tau$ branching fractions. We combine
the direct $\tau$ branching fraction measurements with indirect predictions
using kaon branching fractions measurements to improve the determination of Vus
using $\tau$ branching fractions. The Vus determinations based on the inclusive
branching fraction of $\tau$ to strange final states are about $3\sigma$ lower
than the Vus determination from the CKM matrix unitarity. |
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| ISSN: | 2666-4003 |