## SciPost Submission Page

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

### by Alberto Lusiani

#### - Published as SciPost Phys. Proc. 1 (2019)

### Submission summary

As Contributors: | Alberto Lusiani |

Arxiv Link: | https://arxiv.org/abs/1811.06470v2 |

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) |

Domain(s): | Experimental |

Subject area: | High-Energy Physics - Experiment |

### 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.

###### Current status:

### Author comments upon resubmission

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Revision from ""is superseded" to "has been superseded"