First Observation of the Decay Bs0→Ds-Ds+ and Measurement of Its Branching Ratio Academic Article uri icon


  • We report the observation of the exclusive decay Bs0-->Ds-Ds+ at the 7.5 standard deviation level using 355 pb(-1) of data collected by the CDF II detector in pp collisions at sqrt[s]=1.96 TeV at the Fermilab Tevatron. We measure the relative branching ratio B(Bs0-->Ds-Ds+)/B(B0-->D-Ds+)=1.44(-0.44)(+0.48). Using the world average value for B(B0-->D-Ds+), we find B(Bs0-->Ds-Ds+)=(9.4(-4.2)(+4.4))x10(-3). This provides a lower bound DeltaGammasCP/Gammas>or=2B(Bs0-->Ds-Ds+)>1.2x10(-2) at 95% C.L.

author list (cited authors)

  • Aaltonen, T., Adelman, J., Akimoto, T., Albrow, M. G., González, B., Amerio, S., ... Zucchelli, S.

citation count

  • 14

publication date

  • January 2008