HFAG-Tau Early 2012 Report

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1  Introduction

We present averages of a selection of physics quantities related to the tau lepton, where we follow the HFAG methodology [31] to improve the Review of Particle Physics (PDG) [91] results by:

All published statistical correlations are considered, and a selection of measurements, particularly the most precise and the most recent, were examined to obtain all the significant systematic dependencies. The HFAG techniques are most useful in the global fit of the tau branching fractions (Section 2). We use the branching fraction fit results to obtain updated lepton universality tests (Section 3) and updated determinations of |Vus| with tau measurements (Section 5). Finally, we report in Section 6 the most up-to-date limits on the lepton-flavour-violating tau branching fractions.


HFAG-Tau Early 2012 Report

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