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Latest Belle results on Tau decays

by Y. Jin; D. Epifanov; H. Aihara

Submission summary

As Contributors: Yifan Jin
Preprint link: scipost_201810_00006v2
Date accepted: 2019-01-15
Date submitted: 2018-12-03
Submitted by: Jin, Yifan
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 present preliminary results of a latest measurement at Belle, the branching fraction of rare tau decay, $\tau^- \rightarrow \pi^- \nu_{\tau} \ell^+ \ell^-$ ($\ell = e$ or $\mu$), using a 562 $\rm fb^{-1}$\ data set. The branching fraction of $\tau^- \rightarrow \pi^- e^+ e^- \nu_\tau$ is measured to be $\mathbf{ \mathcal{B}(\tau^-\rightarrow \pi^- e^+ e^- \nu_\tau) = (2.11 \pm 0.19 \pm 0.30) \times 10^{-5}}$, where the first uncertainty is statistical and the second is systematic. An upper limit is set on the branching fraction of $\tau^- \rightarrow \pi^- \mu^+ \mu^- \nu_\tau$, $\mathbf{\mathcal{B}(\tau^-\rightarrow \pi^- \mu^+ \mu^- \nu_\tau) < 1.06 \times 10^{-5}}$, at 90\% confidence level.

Current status:

Submission & Refereeing History

Resubmission scipost_201810_00006v2 on 3 December 2018
Submission scipost_201810_00006v1 on 31 October 2018

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