Bs0-B¯s0 oscillations as a new tool to explore CP violation in Ds± decays

CP violation in Bs0-B¯s0 oscillations is expected at the 10−5 level in the Standard Model but could be enhanced by New Physics. Using Bs0→Ds−ℓ+νℓ decays, LHCb has recently reported the new result (0.39±0.33)×10−2 of the corresponding observable asls. We point out that other current B decay data imply asls=(0.004±0.075)×10−2. In view of this strong constraint, we propose to use Bs0→Ds−ℓ+νℓ and similar flavor-specific decays as a new tool to determine both the production asymmetry between Bs0 and B¯s0 mesons, and the CP asymmetry in the subsequent Ds± decays. The former serves as input for analyses of CP violation in Bs0 channels, with significant room for improvement, while the latter offers an exciting laboratory for New Physics.