TY  - JOUR
PB  - SciPost Foundation
DO  - 10.21468/SciPostPhysProc.1.002
TI  - Latest Belle results on Tau decays
PY  - 2019/02/18
UR  - https://www.scipost.org/SciPostPhysProc.1.002
JF  - SciPost Physics Proceedings
JA  - SciPost Phys. Proc.
VL  - 
IS  - 1
SP  - 002
A1  - Jin, Yifan
AU  - Epifanov, Denis
AU  - Aihara, Hideaki
AB  - 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.
ER  -

@Article{10.21468/SciPostPhysProc.1.002,
	title={{Latest Belle results on Tau decays}},
	author={Yifan Jin and Denis Epifanov and Hiroaki Aihara},
	journal={SciPost Phys. Proc.},
	pages={002},
	year={2019},
	publisher={SciPost},
	doi={10.21468/SciPostPhysProc.1.002},
	url={https://scipost.org/10.21468/SciPostPhysProc.1.002},
}