Mass distributions for a) $ B ^0_s \rightarrow D ^-_s (\phi \pi ^- )\pi ^+ $ , b) $ B ^0_s \rightarrow D ^-_s ( K ^{*0} K ^- )\pi ^+ $ , c) $ B ^0_s \rightarrow D ^-_s ( K ^+ K ^- \pi ^- )\pi ^+ $ and d) $ B ^0_s \rightarrow D ^-_s \pi ^+ \pi ^- \pi ^+ $ candidates. The fits and the various background components are described in the text. "Partial" refers to background from partially reconstructed $B^0_s$ decays, "mis-id" refers to background from fully or partially reconstructed $B^0$ and $\Lambda_b$ decays with one mis-identified daughter particle, and "comb" refers to combinatorial background.

Decay time distributions for a) $ B ^0_s \rightarrow D ^-_s (\phi \pi ^- )\pi ^+ $ , b) $ B ^0_s \rightarrow D ^-_s ( K ^{*0} K ^- )\pi ^+ $ , c) $ B ^0_s \rightarrow D ^-_s ( K ^+ K ^- \pi ^- )\pi ^+ $ and d) $ B ^0_s \rightarrow D ^-_s \pi ^+ \pi ^- \pi ^+ $ candidates. The data and the fit projection are from a mass range of $\pm$ 3$\sigma_m$ around the reconstructed $ B ^0_s$ mass. The abbreviations for the various fit components are introduced in Fig. 1.

Likelihood scan for $\Delta m_{ s }$ in the range [0.0, 25.0] ps$^{-1}$. The line at $-2\Delta \ln L$ = 20.9 indicates the value in the limit $\Delta m_{ s }$ = $\infty$.

Measured asymmetry for $ B ^0_s$ candidates in bins of the decay time $t$ modulo $2\pi / \Delta m_{ s } $. The projection of the likelihood fit is superimposed.

Animated gif made out of all figures.

$B^0_s$ signal yields.

Summary of the systematic uncertainties on $\Delta m_{ s }$ . The total systematic uncertainty is defined as the quadratic sum of the individual components.