English

Recent Results on $\tau$ Decays

High Energy Physics - Experiment 2019-07-01 v1

Abstract

We present herein new results from Belle on the τπντ+\tau^- \rightarrow \pi^- \nu_{\rm \tau} \ell^+ \ell^- branching fraction and from BABAR on the τK(0,1,2,3)π0ντ\tau^- \rightarrow K^- (0,1,2,3) \pi^0 \nu_{\rm \tau}, τπ(3,4)π0ντ\tau^- \rightarrow \pi^- (3,4) \pi^0 \nu_{\rm \tau} and τKKS0ντ\tau^- \rightarrow K^- K^0_{\rm S} \nu_{\rm \tau} branching fractions. From the KKS0K^- K^0_{\rm S} mass spectrum we determine the spectral function. The improved branching fraction measurements of the τK(0,1,2,3)π0ντ\tau^- \rightarrow K^- (0,1,2,3) \pi^0 \nu_{\rm \tau} decays are used to determine Vus|V_{\rm us}| from τXsντ\tau^- \rightarrow X_{\rm s}^- \nu_{\rm \tau} inclusive decays.

Keywords

Cite

@article{arxiv.1906.12232,
  title  = {Recent Results on $\tau$ Decays},
  author = {Gerald Eigen},
  journal= {arXiv preprint arXiv:1906.12232},
  year   = {2019}
}

Comments

8 pages, 11 figures, plenary talk at the Flavor Physics and CP Violation conference, FPCP2019 in Victoria, Canada

R2 v1 2026-06-23T10:06:51.128Z