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Latest Belle results on Tau decays
by Y. Jin; D. Epifanov; H. Aihara
This Submission thread is now published as
Submission summary
| Submission information |
| Preprint link: |
scipost_201810_00006v2
|
| Date accepted: |
2019-01-15 |
| Date submitted: |
2018-12-03 01:00 |
| Submitted by: |
Jin, Yifan |
| Submitted to: |
SciPost Physics Proceedings |
| Proceedings issue: |
The 15th International Workshop on Tau Lepton Physics (Amsterdam, 2018-09) |
| Ontological classification |
| Academic field: |
Physics |
| Specialties: |
- High-Energy Physics - Experiment
|
| Approach: |
Experimental |
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.
Published as
SciPost Phys. Proc. 1, 002 (2019)
