Two-body charmed B(s) decays involving a light scalar meson

Based on the assumption of two-quark structure for the light scalar mesons, within the perturbative QCD approach, we investigate the B -> D-(*()) S(q = u, d, s) decays induced by the b -> u transition, with S denoting a light scalar meson. Under two different scenarios, the branching ratios of 96 decay modes have been calculated, most of which are in the range 10(-5) to 10(-8). These results can be tested in the ongoing LHCb experiment and the forthcoming Belle-II experiment. The comparison between our predictions and the experimental data allows us to probe the inner structure of the scalar mesons. In the standard model, since all decays can only occur through tree operators, there are no CP asymmetries. We note that, due to the mass difference between charm quark and light quarks, the contribution from annihilation diagrams will be enhanced sizably, especially for these color-suppressed or pure-annihilation-type decay modes. We also find that the branching ratios of color-favored decays are sensitive to the different scenarios, so their measurement will help us differentiate the different scenarios. It is also found that the ratios between Br(B -> D-(*())sigma) and Br(B -> D-(*()) f(0)(980)) can be used to determine the mixing angle of s and f(0)(980).