An Imperative study of the angular observables in $Λ_b \to Λ_c^{+}(\to Λπ^{+})\ell^-\barν_{\ell}$ decay and probing the footprint of new physics
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arXiv
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| Formato: | Preprint |
| Publicado: |
2024
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| author | Nandi, Soumitra Sahoo, Shantanu Sain, Ria |
| author_facet | Nandi, Soumitra Sahoo, Shantanu Sain, Ria |
| contents | We study the four-fold angular distribution of the semileptonic $Λ_b \to Λ_c^{+}(\to Λπ^{+})\ell^- \barν_{\ell}$ decay and find out analytical expressions for various asymmetric and angular observables in the standard model (SM) and the relevant new physics (NP) scenarios. Using the available inputs on the form factors from the lattice, we predict the values with uncertainties of all these observables in the SM. We have considered NP effects only in $b\to cτ^-\barν_τ$ transitions, and constrain the Wilson coefficients of the model-independent beyond the SM operators from the available data on $B\to D^{(*)}\ellν_{\ell}$ and $Λ_b \to Λ_c^{+}\ell^- \barν_{\ell}$ decays. In this study, we focus on analysing the contributions to these decays in one- and two-operator scenarios. Furthermore, we test the new physics sensitivities (one or two-operator scenarios) of the different angular and asymmetric observables in $Λ_b \to Λ_c^+ (\to Λπ^{+}) τ^- \barν_τ$ decays and discuss the phenomenology. We observe that it will be possible to distinguish the different NP effects from one another by measuring these observables. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2403_12155 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | An Imperative study of the angular observables in $Λ_b \to Λ_c^{+}(\to Λπ^{+})\ell^-\barν_{\ell}$ decay and probing the footprint of new physics Nandi, Soumitra Sahoo, Shantanu Sain, Ria High Energy Physics - Phenomenology High Energy Physics - Experiment We study the four-fold angular distribution of the semileptonic $Λ_b \to Λ_c^{+}(\to Λπ^{+})\ell^- \barν_{\ell}$ decay and find out analytical expressions for various asymmetric and angular observables in the standard model (SM) and the relevant new physics (NP) scenarios. Using the available inputs on the form factors from the lattice, we predict the values with uncertainties of all these observables in the SM. We have considered NP effects only in $b\to cτ^-\barν_τ$ transitions, and constrain the Wilson coefficients of the model-independent beyond the SM operators from the available data on $B\to D^{(*)}\ellν_{\ell}$ and $Λ_b \to Λ_c^{+}\ell^- \barν_{\ell}$ decays. In this study, we focus on analysing the contributions to these decays in one- and two-operator scenarios. Furthermore, we test the new physics sensitivities (one or two-operator scenarios) of the different angular and asymmetric observables in $Λ_b \to Λ_c^+ (\to Λπ^{+}) τ^- \barν_τ$ decays and discuss the phenomenology. We observe that it will be possible to distinguish the different NP effects from one another by measuring these observables. |
| title | An Imperative study of the angular observables in $Λ_b \to Λ_c^{+}(\to Λπ^{+})\ell^-\barν_{\ell}$ decay and probing the footprint of new physics |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2403.12155 |