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Kim, Ying Li","submitted_at":"2010-07-14T10:31:13Z","abstract_excerpt":"We revisited the extracting $\\left|V_{ub}/V_{cb}\\right|$ and $|V_{ub}|$ through calculating the ratios ${\\cal B}(B^0\\to D_s^{(*)+}(\\pi^-,\\rho^-)/ {\\cal B}(B^0\\to D_s^{(*)+} D^{(*)-})$ in the perturbative QCD approach, which is regarded as an effective theory in dealing with non-leptonic charmed $B$ decays. Utilizing this approach, we could calculate the form factors effectively as well as non-factorizable and annihilation contributions. 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