## HFLAV-Tau Spring 2017 report
M. Chrząszcz, IFJ PAN, Kraków, Poland and Universität Zürich, Switzerland K. Hayasaka, Niigata University, Japan H. Hayashii, Nara Women’s University, Japan A. Lusiani, Scuola Normale Superiore and INFN Pisa, Italy M. Roney, University of Victoria, Canada B. Shwartz, Budker Institute of Nuclear Physics, Russia |

- Introduction
- Branching fraction fit
- Technical implementation of the fit procedure
- Fit results
- Changes with respect to the previous report
- Differences between the HFLAV Spring 2017 fit and the PDG 2016 fit
- Branching ratio fit results and experimental inputs
- Correlation terms between basis branching fractions uncertainties
- Equality constraints

- Tests of lepton universality
- Universality improved B (τ → e ν ν) and R
_{had} - |V
_{us}| measurement - Upper limits on τ lepton-flavour-violating branching fractions
- Upper limits on τ lepton-flavour-violating branching fractions: summary plot
- Combination of upper limits on τ lepton-flavour-violating branching fractions
- Combination of upper limits on τ lepton-flavour-violating branching fractions: summary plot
- Branching fractions fit measurement list by reference
- References