Semileptonic $B \to D^*$ decays from light to $τ$ leptons: the extraction of the form factor $F_2$ from data
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| Format: | Preprint |
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2024
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| _version_ | 1866916625252352000 |
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| author | Martinelli, G. Simula, S. Vittorio, L. |
| author_facet | Martinelli, G. Simula, S. Vittorio, L. |
| contents | We extend the Standard Model (SM) analysis of Ref. [1], which was limited to light leptons in the final state, to the semileptonic $B \to D^* τν_τ$ decay. By using quantities that can be analised without the knowledge of $\vert V_{cb}\vert$, we derive important information about the helicity amplitudes and the hadronic form factors that can be compared with the predictions of lattice QCD calculations. In particular, there is a difficulty in reproducing simultaneously the experimental values of $R(D^*)$ and of other quantities relevant for the semitauonic decays within the SM. As a byproduct of our analysis, we also present a determination of $\vert V_{cb}\vert$ from the total decay rate. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2410_17974 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Semileptonic $B \to D^*$ decays from light to $τ$ leptons: the extraction of the form factor $F_2$ from data Martinelli, G. Simula, S. Vittorio, L. High Energy Physics - Phenomenology High Energy Physics - Experiment High Energy Physics - Lattice We extend the Standard Model (SM) analysis of Ref. [1], which was limited to light leptons in the final state, to the semileptonic $B \to D^* τν_τ$ decay. By using quantities that can be analised without the knowledge of $\vert V_{cb}\vert$, we derive important information about the helicity amplitudes and the hadronic form factors that can be compared with the predictions of lattice QCD calculations. In particular, there is a difficulty in reproducing simultaneously the experimental values of $R(D^*)$ and of other quantities relevant for the semitauonic decays within the SM. As a byproduct of our analysis, we also present a determination of $\vert V_{cb}\vert$ from the total decay rate. |
| title | Semileptonic $B \to D^*$ decays from light to $τ$ leptons: the extraction of the form factor $F_2$ from data |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment High Energy Physics - Lattice |
| url | https://arxiv.org/abs/2410.17974 |