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, 2026Journal of High Energy Physics0 citationsOpen Access

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

UDUtsab DeyIndian Institute of Technology Guwahati SNSoumitra NandiIndian Institute of Technology Guwahati

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.

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