Search for time-dependent Bs0-(Bs0)over-bar oscillations using exclusively reconstructed Ds± mesons -: art. no. 032009

A search for B-s(0)-<(B-s(o))over bar> oscillations is performed using a sample of 400 000 hadronic Z(0) decays collected by the SLAC Large Detector experiment. The B-s(0) candidates are reconstructed in the B-s(0)-->Ds-X channel with D-s(-)-->phipi(-), (KK-)-K-*0. The B-s(0) production flavor is determined using the large forward-backward asymmetry of polarized Z(0)-->b (b) over bar decays and charge information in the hemisphere opposite that of the B-s(0) candidate. The decay flavor is tagged by the charge of the D-s(+/-). From a sample of 361 candidates with an average B-s(0) purity of 40%, we exclude the following values of the oscillation frequency: Deltam(s)<1.4 ps(-1) and 2.4<5.3 ps(-1) at the 95% confidence level.