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tau branching fractions
 global constrained fit of tau branching fractions
 test lepton universality, compute Vus
tau lepton flavour violation
 report all the best experimental upper limits
 compute combinations of experimental upper limits
Current results (End 2018)
 End 2018 HFLAV report, September 2019
 Averages of bhadron, chadron, and taulepton properties as of End 2018, arXiv:1909.12524v1 [hepex]
 HFLAV Tau End 2018 web report (27 September 2019)
 with respect to the previous [Spring 2017] report, some new published and preliminary BaBar tau branching fractions measurements have been included and the Vus calculations have been revised and updated
Latest contribution to the PDG
 The PDG 2020 includes a tau branching fractions fit and a tau branching fraction review based on the same published experimental inputs that are used by the HFLAV End 2018 fit, but without inclusion of the preliminary results. Furthermore, the PDG fit uses the customary PDG unitarity constraint, while the HFLAV fit does not.
Past results
 Spring 2017 HFLAV report, December 2017
 Summer 2016 HFLAV report, version 1, October 2016
 arXiv:1612.07233 [hepex], Y. Amhis et al., "Averages of bhadron, chadron, and taulepton properties as of Summer 2016"
 HFLAV Tau Summer 2016 web report, published on 7 October 2016
 no significant updates since 2014, but several minor improvement and fixes
 Summer 2014 HFLAV report
 arXiv:1412.7515 [hepex], Y. Amhis et al., "Averages of bhadron, chadron, and taulepton properties as of Summer 2014"
 HFLAV Tau Summer 2014 web report
 includes combinations on limits on searches for Lepton flavor Violation in tau decays
 Early 2012 HFLAV report
 HFLAV Tau Summer 2011 web report
 since March 2011 includes some additional new and old measurements
 Summer 2010 HFLAV report
 arXiv:1010.1589v3 [hepex], D. Asner et al., "Averages of bhadron, chadron, and taulepton Properties"
 (this HFLAV report includes for the first time a Tau section)
Past contributions to the PDG
 PDG 2016, 2017 and 2018 include a tau branching fractions fit and a tau branching fraction review (not yet published as of 18 October 2019) based on the same experimental inputs of the HFLAV Spring 2017 fit, but treated with the customary PDG unitarity constraint
Additional useful references, which are not official HFLAV Tau reports

Tau 2010 proceedings contribution on HFLAV Tau ongoing work
 S. Banerjee et al., Status Report from Tau subgroup of the HFLAV,
Proceedings of the 11th International Workshop on Tau Lepton Physics, Manchester, UK, 1317 September 2010,
arXiv:1101.5138 [hepex]
Members
 Swagato Banerjee (University of Louisville, BaBar)
 Marcin Chrząszcz (University of Zürich & Kraków, LHCb)
 Kiyoshi Hayasaka (Niigata University, Belle)
 Hisaki Hayashii (Nara Woman's University, Belle)
 Alberto Lusiani, convener (Scuola Normale Superiore and INFN Pisa, BaBar)
 Mike Roney (University of Victoria, BaBar)
 Boris Shwartz (BINP, Belle)
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