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| Format: | Preprint |
| Veröffentlicht: |
2023
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| Online-Zugang: | https://arxiv.org/abs/2302.02886 |
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| _version_ | 1866913322740219904 |
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| author | LHCb Collaboration |
| author_facet | LHCb Collaboration |
| contents | The ratios of branching fractions $\mathcal{R}(D^{*})\equiv\mathcal{B}(\bar{B}\to D^{*}τ^{-}\barν_τ)/\mathcal{B}(\bar{B}\to D^{*}μ^{-}\barν_μ)$ and $\mathcal{R}(D^{0})\equiv\mathcal{B}(B^{-}\to D^{0}τ^{-}\barν_τ)/\mathcal{B}(B^{-}\to D^{0}μ^{-}\barν_μ)$ are measured, assuming isospin symmetry, using a sample of proton-proton collision data corresponding to 3.0 fb${ }^{-1}$ of integrated luminosity recorded by the LHCb experiment during 2011 and 2012. The tau lepton is identified in the decay mode $τ^{-}\toμ^{-}ν_τ\barν_μ$. The measured values are $\mathcal{R}(D^{*})=0.281\pm0.018\pm0.024$ and $\mathcal{R}(D^{0})=0.441\pm0.060\pm0.066$, where the first uncertainty is statistical and the second is systematic. The correlation between these measurements is $ρ=-0.43$. Results are consistent with the current average of these quantities and are at a combined 1.9 standard deviations from the predictions based on lepton flavor universality in the Standard Model. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2302_02886 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Measurement of the ratios of branching fractions $\mathcal{R}(D^{*})$ and $\mathcal{R}(D^{0})$ LHCb Collaboration High Energy Physics - Experiment The ratios of branching fractions $\mathcal{R}(D^{*})\equiv\mathcal{B}(\bar{B}\to D^{*}τ^{-}\barν_τ)/\mathcal{B}(\bar{B}\to D^{*}μ^{-}\barν_μ)$ and $\mathcal{R}(D^{0})\equiv\mathcal{B}(B^{-}\to D^{0}τ^{-}\barν_τ)/\mathcal{B}(B^{-}\to D^{0}μ^{-}\barν_μ)$ are measured, assuming isospin symmetry, using a sample of proton-proton collision data corresponding to 3.0 fb${ }^{-1}$ of integrated luminosity recorded by the LHCb experiment during 2011 and 2012. The tau lepton is identified in the decay mode $τ^{-}\toμ^{-}ν_τ\barν_μ$. The measured values are $\mathcal{R}(D^{*})=0.281\pm0.018\pm0.024$ and $\mathcal{R}(D^{0})=0.441\pm0.060\pm0.066$, where the first uncertainty is statistical and the second is systematic. The correlation between these measurements is $ρ=-0.43$. Results are consistent with the current average of these quantities and are at a combined 1.9 standard deviations from the predictions based on lepton flavor universality in the Standard Model. |
| title | Measurement of the ratios of branching fractions $\mathcal{R}(D^{*})$ and $\mathcal{R}(D^{0})$ |
| topic | High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2302.02886 |