Quasi-two-body decays B→ DK∗(892) → DKπ in the perturbative QCD approach

Abstract

We study the quasi-two-body decays B→ DK∗(892) → DKπ by employing the perturbative QCD approach. The two-meson distribution amplitudes ΦKπP-wave are adopted to describe the final state interactions of the kaon–pion pair in the resonance region. The resonance line shape for the P-wave Kπ component K∗(892) in the time-like form factor FKπ(s) is parameterized by the relativistic Breit-Wigner function. For most considered decay modes, the theoretical predictions for their branching ratios are consistent with currently available experimental measurements within errors. We also disscuss some ratios of the branching fractions of the concerned decay processes. More precise data from LHCb and Belle-II are expected to test our predictions.