PoS - Proceedings of Science
Volume 340 - The 39th International Conference on High Energy Physics (ICHEP2018) - Posters
Measurement of the of $\tau^- \rightarrow \pi^- \nu_{\tau} e^+ e^-$ branching fraction by Belle
Y. Jin,* D. Epifanov, H. Aihara On behalf of the BELLE Collaboration
*corresponding author
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Published on: August 02, 2019
Abstract
Preliminary result of the measurement of the branching fraction of rare tau decay, $\tau^- \rightarrow \pi^- \nu_{\tau} e^+ e^-$, is presented. A 562 $\rm fb^{-1}$ data set collected with Belle detector at the KEKB asymmetric-energy $\rm e^+ e^-$ collider is used. The branching fraction of $\tau^- \rightarrow \pi^- e^+ e^- \nu_\tau$ is measured to be $\mathcal{B}(\tau^ \rightarrow \pi^- e^+ e^- \nu_\tau) = (2.11 \pm 0.19 \pm 0.30) \times 10^{-5}$, where the first uncertainty is statistical and the second is systematic. The measured result is consistent with the theoretical prediction from the Standard Model and could facilitate searches for physics beyond the Standard Model.
DOI: https://doi.org/10.22323/1.340.0915
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