The two-body B_c {\to} D^{(*)}_{(s)}P, D^{(*)}_{(s)}V decays in the Perturbative QCD Approach

TL;DR

This paper systematically studies B_c meson decays into D^{(*)}_{(s)} mesons and light pseudoscalar or vector mesons using perturbative QCD, predicting branching ratios, CP asymmetries, and polarization fractions.

Contribution

It provides the first comprehensive predictions of decay rates, CP asymmetries, and polarization fractions for B_c decays within the perturbative QCD framework, highlighting the importance of non-factorizable and annihilation diagrams.

Findings

Large transverse polarization fractions (50-70%) predicted in some decays.

Possible large direct CP violation in certain channels.

Non-factorizable and annihilation diagrams significantly affect decay observables.

Abstract

We make a systematic investigation on the two-body nonleptonic decays B_c {\to} D^{(*)}_{(s)}P, D^{(*)}_{(s)}V, by employing the perturbative QCD approach based on k_T factorization, where P and V denote any light pseudoscalar meson and vector meson, respectively. We predict the branching ratios and direct CP-asymmetries of these B_c decays and also the transverse polarization fractions of B_c {\to} D^{*}_{(s)}V decays. It is found that the non-factorizable emission diagrams and annihilation type diagrams have remarkable effects on the physical observables in many channels, especially the color-suppressed and annihilation-dominant decay modes. A possible large direct CP-violation is predicted in some channels; and a large transverse polarization contribution that can reach 50% ~ 70% is predicted in some of the Bc {\to} D^{*}_{(s)}V decays.