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CP violation in $B^0_s$-$\bar B^0_s$ oscillations is expected at the$10^{-5}$ level in the Standard Model but could be enhanced by New Physics.Using $B^0_s\to D_s^-\ell^+\nu_\ell$ decays, LHCb has recently reported the newresult $(0.39\pm0.33)\times10^{-2}$ of the corresponding observable $a^s_{\rmsl}$. We point out that other current $B$ decay data imply $a^s_{\rm sl} =(0.004 \pm 0.075)\times10^{-2}$. In view of this strong constraint, we proposeto use $B^0_s\to D_s^-\ell^+\nu_\ell$ and similar flavor-specific decays as anew tool to determine both the production asymmetry between $B^0_s$ and $\barB^0_s$ mesons, and the CP asymmetry in the subsequent $D^\pm_s$ decays. Theformer serves as input for analyses of CP violation in $B^0_s$ channels, withsignificant room for improvement, while the latter offers an excitinglaboratory for New Physics.

$B^0_s$-$\bar B^0_s$ Oscillations as a New Tool to Explore CP Violation in $D_s^\pm$ Decays