Branching ratio and CP violation of B_c→DK decaysin the perturbative QCD approach

摘要

In this paper, we calculate the branching ratioand direct C P asymmetry parameter of B_c~± →D~0 K~±inthe framework of a perturbative QCD approach based onk_Tfactorization. Besides the usual factorizable diagrams,both nonfactorizable and annihilation type contributions aretaken into account. We find that (a) the branching ratio is atthe order of 10~(-5); (b) the tree annihilation diagrams and thepenguin diagrams dominate the total contribution; and (c)the direct CP asymmetry is about 7%, which can be testedin the Large Hadron Collider beauty experiments (LHC-b)at CERN.