New physics effects on $B\to D^{(*)}τν$ decays
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arXiv
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| Format: | Preprint |
| Veröffentlicht: |
2024
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| _version_ | 1866929754942210048 |
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| author | Lee, Jong-Phil |
| author_facet | Lee, Jong-Phil |
| contents | We investigate new physics effects on $B\to D^{(*)}τν$ decays in a general and model-independent way. The $χ^2$ fits for fractions of the branching ratios $R(D^{(*)})$ and other polarization parameters are implemented. We parameterize the relevant Wilson coefficients with a new physics scale and its power together with combined fermionic couplings. Constraints from $B_c\toτν$ are imposed such that its branching ratio is less than 30%. For a moderate range of our parameters we find that the new physics scale goes up to $\lesssim 27$ TeV for ordinary new particle contributions. It turns out that the polarization asymmetry of $τ$ for $B\to D$ transition can be negative only for a few combinations of the new physics operators. We also discuss related processes $B_c\to J/Ψτν$ and $Λ_b\toΛ_cτν$ decays. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2411_19843 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | New physics effects on $B\to D^{(*)}τν$ decays Lee, Jong-Phil High Energy Physics - Phenomenology We investigate new physics effects on $B\to D^{(*)}τν$ decays in a general and model-independent way. The $χ^2$ fits for fractions of the branching ratios $R(D^{(*)})$ and other polarization parameters are implemented. We parameterize the relevant Wilson coefficients with a new physics scale and its power together with combined fermionic couplings. Constraints from $B_c\toτν$ are imposed such that its branching ratio is less than 30%. For a moderate range of our parameters we find that the new physics scale goes up to $\lesssim 27$ TeV for ordinary new particle contributions. It turns out that the polarization asymmetry of $τ$ for $B\to D$ transition can be negative only for a few combinations of the new physics operators. We also discuss related processes $B_c\to J/Ψτν$ and $Λ_b\toΛ_cτν$ decays. |
| title | New physics effects on $B\to D^{(*)}τν$ decays |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2411.19843 |