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| Format: | Preprint |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2405.08953 |
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| _version_ | 1866911877049614336 |
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| author | Chen, Chen |
| author_facet | Chen, Chen |
| contents | This report introduces two recent measurements of semileptonic $b$-hadron decays at the LHCb experiment, including a test of Lepton Flavour Universality (LFU) using $\bar{B}^0 \to D^{(*)+} l^- \barν_l$ decays where $l\in\{μ,τ\}$, and a study of the $D^{*+}$ longitudinal polarisation in the $\bar{B}^0 \to D^{*+} τ^- \barν_τ$ decay. With the inclusion of the new results of the LFU ratios, the world average on $R(D)$ and $R(D^*)$, still shows a tension over three standard deviations from the SM prediction, while the measured $D^{*+}$ longitudinal polarisation is compatible with the SM value. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_08953 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | $b \to c l \barν$ decays at LHCb Chen, Chen High Energy Physics - Experiment This report introduces two recent measurements of semileptonic $b$-hadron decays at the LHCb experiment, including a test of Lepton Flavour Universality (LFU) using $\bar{B}^0 \to D^{(*)+} l^- \barν_l$ decays where $l\in\{μ,τ\}$, and a study of the $D^{*+}$ longitudinal polarisation in the $\bar{B}^0 \to D^{*+} τ^- \barν_τ$ decay. With the inclusion of the new results of the LFU ratios, the world average on $R(D)$ and $R(D^*)$, still shows a tension over three standard deviations from the SM prediction, while the measured $D^{*+}$ longitudinal polarisation is compatible with the SM value. |
| title | $b \to c l \barν$ decays at LHCb |
| topic | High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2405.08953 |