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A search for CP violation has been performed in a sample of semileptonic Bsdecays corresponding to approximately 5fb^-1 of data collected by the D0detector in Run II at the Fermilab Tevatron collider. A time-dependent fit tothe distributions of Bs candidates yields the flavour-specific asymmetry a^s_fs= [-1.7 +/- 9.1 (stat) +1.2 -2.3 (syst)] x 10^-3, corresponding to the mostprecise measurement to date for this CP violation parameter. Furthermore asearch for the semi-inclusive process Bs to Ds^(*)Ds^(*) has been performed ona data sample of 2.8fb^-1. 26.6 +/- 8.4 signal events are observed with asignificance of 3.2 standard deviations above background, leading to abranching ratio of 0.035 +/- 0.010 (stat) +/- 0.011 (syst). Under certaintheoretical assumptions, these double-charm final states saturate CP-eveneigenstates in the $B_s$ decays, resulting in a width difference of DeltaGamma_s^CP / Gamma_s = 0.072 +/- 0.021 (stat) +/- 0.022 (syst).

CP-conserving and CP-violating properties in semileptonic Bs decays with the D0 experiment