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

by Alberto Lusiani

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Submission summary

Authors (as registered SciPost users): Alberto Lusiani
Submission information
Preprint Link:  (pdf)
Date accepted: 2019-01-17
Date submitted: 2018-12-17 01:00
Submitted by: Lusiani, Alberto
Submitted to: SciPost Physics Proceedings
Proceedings issue: The 15th International Workshop on Tau Lepton Physics (TAU2018)
Ontological classification
Academic field: Physics
  • High-Energy Physics - Experiment
Approach: Experimental


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.

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Revision from ""is superseded" to "has been superseded"

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

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