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      Measurement of the branching fraction Br(Bs -> Ds(*) Ds(*))

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          Abstract

          We report a measurement of the branching fraction Br(Bs -> 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. The resulting measurement is Br(Bs -> Ds(*) Ds(*)) = 0.039 +0.019 -0.017 (stat) +0.016 -0.015 (syst). This was subsequently used to estimate the width difference Delta Gamma^{CP}_s in the Bs-Bsbar system: Delta Gamma^{CP}_s / Gamma_s = 0.079 +0.038 -0.035 (stat) +0.031 -0.030 (syst).

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          Journal
          28 February 2007
          Article
          10.1103/PhysRevLett.99.241801
          hep-ex/0702049
          fa27b100-37cf-4bc9-9c0c-bb244bcf7437
          Custom metadata
          FERMILAB-PUB-07/047-E
          Phys.Rev.Lett.99:241801,2007
          Submitted to Phys. Rev. Lett
          hep-ex

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