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This paper summarises the recent results of the Run IIa D0 experiment at theTevatron Collider at Fermilab on the observable parameters of the $B_{s}$meson. A measurement of the branching fraction $B_s->D_s^{(*)}D_s^{(*)}$ isreported, which provides an estimate of the width difference$\Delta\Gamma_{s}^{CP}/\Delta\Gamma_{s}$. Through the decay $B_{s} \to J/\psi\phi$ the width difference $\Delta\Gamma_{s}$ is extracted, and for the firsttime a constraint is set on the CP-violating phase $\phi_{s}$, although afour-fold ambiguity remains. This result is combined with other D0 measurementsto yield $\Delta\Gamma_{s}=0.13\pm0.09 {\rm ps^{-1}}$, $\phi_{s} =-0.70^{+0.47}_{-0.39}$.

Studies of CP-conserving and CP-violating Bs mixing parameters with the D0 experiment