# HFLAV $τ$ branching fractions fit and measurements of Vus with $τ$ lepton data

### Submission summary

 As Contributors: Alberto Lusiani Arxiv Link: https://arxiv.org/abs/1811.06470v2 (pdf) Date accepted: 2019-01-17 Date submitted: 2018-12-17 Submitted by: Lusiani, Alberto Submitted to: SciPost Physics Proceedings Proceedings issue: The 15th International Workshop on Tau Lepton Physics (Amsterdam, 2018-09) Discipline: Physics Subject area: High-Energy Physics - Experiment Approach: Experimental

### Abstract

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.

Published as SciPost Phys. Proc. 1, 001 (2019)

I applied all recommendations except this one:
"References: blank space is missing between the journal and the volume"
I checked the bibliography references and found that there are spaces between the journal and volume numbers. I am using the SciPost bibliography style, which uses the common convention that for journals like Phys.Rev.D the "D" is attached to the volume number. I think that that should stay so for SciPost proceedings.

### List of changes

Two typos fixed.
Results on τ→K/π(n)π0ντ are now all with 3 decimal places.
Revision from ""is superseded" to "has been superseded"

### Submission & Refereeing History

Resubmission 1811.06470v2 on 17 December 2018
Submission 1811.06470v1 on 16 November 2018