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From an analysis of the flavor-tagged decay \bsdec we obtain the widthdifference between the $B_s^0$ light and heavy mass eigenstates, $\Delta\Gamma_s \equiv \Gamma_L - \Gamma_H = 0.19 \pm 0.07 {\rm (stat)}\thinspace^{+0.02}_{-0.01} {\rm (syst)}$ ps$^{-1}$, and the CP-violating phase, $\phi_{s}=-0.57 ^{+0.24}_{-0.30} {\rm (stat)}\thinspace ^{+0.07}_{-0.02} {\rm (syst)}$.The allowed 90% C.L. intervals of $\Delta \Gamma_s$ and $\phi_s$ are $0.06<\Delta \Gamma_s <0.30$ ps$^{-1}$ and $-1.20 <\phi_s < 0.06$, respectively. Thedata sample corresponds to an integrated luminosity of 2.8 fb$^{-1}$accumulated with the D0 detector at the Fermilab Tevatron collider.

Measurement of $\boldmath {B_s^0}$ mixing parameters from the flavor-tagged decay