A. M. Kalinin

Study of the Decay B{sub s}{sup 0}{yields}D{sub s}{sup (*)}D{sub s}{sup (*)}

We report a study of the decay B{sub s}{sup 0}{yields}D{sub s}{sup (*)}D{sub s}{sup (*)} using a data sample corresponding to 1.3 fb{sup -1} of integrated luminosity collected by the D0 experiment in 2002-2006 during run II of the Fermilab Tevatron collider. One D{sub s}{sup (*)} meson was partially reconstructed in the decay D{sub s}{yields}{phi}{mu}{nu}, and the other D{sub s}{sup (*)} meson was identified using the decay D{sub s}{yields}{phi}{pi} where no attempt was made to distinguish D{sub s} and D{sub s}* states. For the branching fraction Br(B{sub s}{sup 0}{yields}D{sub s}{sup (*)}D{sub s}{sup (*)}) we obtain a 90% C.L. range [0.002,0.080] and central value 0.039{sub -0.017}{sup +0.019}(stat){sub -0.015}{sup +0.016}(syst). This was subsequently used to make the most precise estimate of the width difference {delta}{gamma}{sub s}{sup CP} in the B{sub s}{sup 0}-B{sub s}{sup 0} system: {delta}{gamma}{sub s}{sup CP}/{gamma}{sub s}=0.079{sub -0.035}{sup +0.038}(stat){sub -0.030} = {sup +0.031}(syst)We report a study of the decay Bs(0)-->Ds(*)Ds(*) using a data sample corresponding to 1.3 fb(-1) of integrated luminosity collected by the D0 experiment in 2002-2006 during run II of the Fermilab Tevatron collider. One Ds(*) meson was partially reconstructed in the decay Ds-->phi mu nu, and the other Ds(*) meson was identified using the decay Ds-->phi pi where no attempt was made to distinguish Ds and Ds(*) states. For the branching fraction Br(Bs(0)-->Ds(*)Ds(*)) we obtain a 90% C.L. range [0.002,0.080] and central value 0.039(-0.017)(+0.019)(stat)(-0.015)(+0.016)(syst). This was subsequently used to make the most precise estimate of the width difference DeltaGamma(s)CP in the Bs(0)-Bs(0) system: DeltaGamma(s)CP/Gamma(s)=0.079(-0.035)(+0.038)(stat)(-0.030)(+0.031)(syst).