What question did this study set out to answer?

To study the decays of B_c mesons and extract the form factors and other observables within the Standard Model.

April 29, 2026Open Access

Study of form factors and observables in Bc^- → D^ () 0^- and Bc^- → D (∗) −ℓ+ℓ− decays

Key Points

To study the decays of B_c mesons and extract the form factors and other observables within the Standard Model.
Utilized perturbative QCD form factors for B_c and D mesons.
Applied lattice QCD inputs for B → D and B_c → D transitions.
Conducted a detailed angular analysis of the cascade decay B_c → D ∗− (→ D 0 π − ) ℓ + ℓ −.
Provided predictions for branching fractions in B_c decays.
Estimated lepton flavor violating observables and q 2 -dependence of form factors.

Abstract

A bstract We investigate the decays Bc^- B c − → D^ () 0^- D ¯ ∗ 0 ℓ − ν ¯ ℓ and Bc^- B c − → D (∗) − ℓ + ℓ − 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 → D (∗) and B c → D transitions, we extract the shape parameters of the meson wave functions and estimate the q 2 -dependence of B c → 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 Bc^- B c − → D ∗− (→ D 0 π −) ℓ + ℓ −, providing SM expectations for several angular observables.

Study of form factors and observables in Bc^- → D^ () 0^- and Bc^- → D (∗) −ℓ+ℓ− decays

Key Points

Abstract

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