Study of Form Factors and Observables in $B_c^- \rightarrow \bar{D}^{(*)0}\ell^-\barν_{\ell}$ and $B_c^- \rightarrow D^{(*)-}\ell^+\ell^-$ decays
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| Format: | Preprint |
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2025
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| author | Dey, Utsab Nandi, Soumitra |
| author_facet | Dey, Utsab Nandi, Soumitra |
| contents | We investigate the decays $B_c^- \rightarrow \bar{D}^{(*)0}\ell^-\barν_{\ell}$ and $B_c^- \rightarrow D^{(*)-}\ell^+\ell^-$ within the Standard Model (SM), employing perturbative QCD (pQCD) form factors that are sensitive to the wave functions of $B_c$ and $D^{(*)}$ mesons. Using lattice QCD inputs for $B \to D^{(*)}$ and $B_c \to D$ transitions, we extract the shape parameters of the meson wave functions and estimate the $q^2$-dependence of $B_c \to D^*$ form factors via heavy quark spin symmetry. We present predictions for branching fractions, lepton flavor violating observables, and perform a detailed angular analysis of the cascade decay $B_{c}^{-} \to D^{*-}(\to D^{0}π^{-}) \ell^+\ell^-$, providing SM expectations for several angular observables. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_19445 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Study of Form Factors and Observables in $B_c^- \rightarrow \bar{D}^{(*)0}\ell^-\barν_{\ell}$ and $B_c^- \rightarrow D^{(*)-}\ell^+\ell^-$ decays Dey, Utsab Nandi, Soumitra High Energy Physics - Phenomenology We investigate the decays $B_c^- \rightarrow \bar{D}^{(*)0}\ell^-\barν_{\ell}$ and $B_c^- \rightarrow D^{(*)-}\ell^+\ell^-$ within the Standard Model (SM), employing perturbative QCD (pQCD) form factors that are sensitive to the wave functions of $B_c$ and $D^{(*)}$ mesons. Using lattice QCD inputs for $B \to D^{(*)}$ and $B_c \to D$ transitions, we extract the shape parameters of the meson wave functions and estimate the $q^2$-dependence of $B_c \to D^*$ form factors via heavy quark spin symmetry. We present predictions for branching fractions, lepton flavor violating observables, and perform a detailed angular analysis of the cascade decay $B_{c}^{-} \to D^{*-}(\to D^{0}π^{-}) \ell^+\ell^-$, providing SM expectations for several angular observables. |
| title | Study of Form Factors and Observables in $B_c^- \rightarrow \bar{D}^{(*)0}\ell^-\barν_{\ell}$ and $B_c^- \rightarrow D^{(*)-}\ell^+\ell^-$ decays |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2509.19445 |