Improved measurement of B0bar -> D_s^-D^+ and search for B0bar -> D_s^+D_s^- at Belle

Abstract

We reconstruct B0bar -> D_s^-D^+ decays using a sample of 275 million BBbar pairs recorded by the Belle experiment, and we measure the branching fraction to be [7.42 +- 0.23(stat) +- 1.36(syst)] x 10^(-3). We also search for the related decay B0bar -> D_s^+D_s^-. We observe no statistically significant signal and set an upper limit on the branching fraction of 2.0 x 10^(-4) at 90% C.L.

arXiv commentContributed to 22nd International Symposium on Lepton-Photon Interactions at High Energy (LP 2005), Uppsala, Sweden, 30 Jun - 5 Jul 2005 and contributed to EPS International Europhysics Conference on High Energy Physics (HEPP-EPS 2005), Lisbon, Portugal, 21-27 Jul 2005