Jul 10 – 17, 2019
Ghent
Europe/Brussels timezone

Measurement of the branching fractions ${\cal{B}}(\tau \to K\,n\pi^0 \nu)$, $n=0,1,2,3$, and ${\cal{B}}(\tau \to \pi\,n\pi^0 \nu)$, $n=3,4$

Jul 13, 2019, 12:20 PM
20m
Campus Ledeganck - Aud. 5 (Ghent)

Campus Ledeganck - Aud. 5

Ghent

Parallel talk Flavour Physics and CP Violation Flavour Physics and CP Violation

Speaker

Alberto Lusiani (Scuola Normale Superiore and INFN, sezione di Pisa)

Description

We report the measurements of the branching fractions of the decays $\tau \to K\,n\pi^0 \nu$, $n=0,1,2,3$, and $\tau\to \pi\, n\pi^0 \nu$, $n=3,4$. The measurements are based on a data sample of 435 million tau pairs produced in $e^+e^-$ collisions at and near the $Y(4S)$ peak and collected with the BABAR detector in $1999-2008$. Additional systematic studies have been completed after the presentation of the preliminary results. Most measurements are substantial improvements over previous measurements and ${\cal{B}}(\tau \to \pi\,4\pi^0 \nu)$, is measured for the first time. These measurements improve the determination of $|V_{us}|$ from the branching fraction $\tau^{-} \to X_{s}^{-} \nu_\tau$ computed as the sum of all measured exclusive modes, with a method based on finite-energy QCD sum rules.

Primary authors

Fabio Anulli (Sapienza Universita e INFN, Roma I (IT)) Alberto Lusiani (Scuola Normale Superiore and INFN, sezione di Pisa)

Presentation materials