Abstract
We report the status and progress of the Heavy Flavour Averaging Group work on the global fit of τ tau lepton branching fractions, on the lepton universality tests and on the measurement of the Cabibbo-Kobayashi-Maskawa matrix element |Vus| using τ lepton measurements. We also review the prospects for improving the precision of the |Vus| measurement.
Highlights
To best exploit the many experimental measurements on the τ lepton branching fractions, it is convenient to perform a global fit
The τ subgroup of the Heavy Flavour Averaging Group (HFLAV) has updated in 2016 the global fit of the τ branching fractions, the lepton universality tests and the |Vus| determination based on τ measurements
We review the prospects for improving the |Vus| determination based on τ measurements
Summary
To best exploit the many experimental measurements on the τ lepton branching fractions, it is convenient to perform a global fit. The τ subgroup of the Heavy Flavour Averaging Group (HFLAV) has updated in 2016 the global fit of the τ branching fractions, the lepton universality tests and the |Vus| determination based on τ measurements. All the 2016 HFLAV-Tau results have been submitted for publication as part of the 2016 HFLAV report [2]. These results are labelled “Spring 2017” and have only minimal differences to formerly reported preliminary results [3]. We review the prospects for improving the |Vus| determination based on τ measurements
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