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| Main Author: | |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2506.03000 |
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| _version_ | 1866908391658487808 |
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| author | Gaudino, Giovanni |
| author_facet | Gaudino, Giovanni |
| contents | We presented at Moriond EW 2025 a measurement of the branching fraction of $B\toτν$ decays using $(387\pm 6) \times 10^6$ $Υ(4S)$ collected between 2019 and 2022 with the Belle~II detector at the SuperKEKB $e^+e^-$ collider. We reconstruct the accompanying $B^-$ meson using the hadronic tagging method, while $B\toτν$ candidates are identified in the recoil. We find evidence for $B\toτν$ decays at 3.0 standard deviations, including systematic uncertainties. The measured branching fraction is $\mathcal{B}(B\rightarrowτν) = [1.24 \pm 0.41~\text{(stat.)} \pm 0.19~\text{(syst.)}] \times 10^{-4}$ |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_03000 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | $\mathcal{B}(B\rightarrowτν)$ measurement with the hadronic FEI at Belle~II Gaudino, Giovanni High Energy Physics - Experiment We presented at Moriond EW 2025 a measurement of the branching fraction of $B\toτν$ decays using $(387\pm 6) \times 10^6$ $Υ(4S)$ collected between 2019 and 2022 with the Belle~II detector at the SuperKEKB $e^+e^-$ collider. We reconstruct the accompanying $B^-$ meson using the hadronic tagging method, while $B\toτν$ candidates are identified in the recoil. We find evidence for $B\toτν$ decays at 3.0 standard deviations, including systematic uncertainties. The measured branching fraction is $\mathcal{B}(B\rightarrowτν) = [1.24 \pm 0.41~\text{(stat.)} \pm 0.19~\text{(syst.)}] \times 10^{-4}$ |
| title | $\mathcal{B}(B\rightarrowτν)$ measurement with the hadronic FEI at Belle~II |
| topic | High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2506.03000 |