Study of Form Factors and Observables in B_c^- → D^(*)0ℓ^-ν_ℓ and B_c^- → D^(*)-ℓ⁺ℓ^- decays

2025/09/23 by Dey, Utsab, Nandi, Soumitra
#FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph)

paper · doi:10.48550/arxiv.2509.19445

Abstract

We investigate the decays B_c^- → D^(*)0ℓ^-ν_ℓ and B_c^- → D^(*)-ℓ⁺ℓ^- within the Standard Model (SM), employing perturbative QCD form factors that are sensitive to the wave functions of B_c and D^(*) mesons. Using lattice QCD inputs for B → D^(*) and B_c → D transitions, we extract the shape parameters of the meson wave functions and estimate the q²-dependence of B_c → D^* form factors via heavy quark spin symmetry. We present predictions for branching ratios, lepton flavor violating observables, and perform a detailed angular analysis of the cascade decay B_c^- → D^*-(→ D^-π⁰) ℓ⁺ℓ^-, providing SM expectations for several angular observables.

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