Search for time-dependentBs0−Bs0¯oscillations using exclusively reconstructedDs±mesons

A search for

B_{s}^{0} - \bar{B_{s}^{0}}

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} \to D_{s}^{-} X

channel with

D_{s}^{-} \to φ π^{-},

K^{* 0} K^{-} .

The

B_{s}^{0}

production flavor is determined using the large forward-backward asymmetry of polarized

Z^{0} \to b \bar{b}

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}^{\pm} .

From a sample of 361 candidates with an average

B_{s}^{0}

purity of 40%, we exclude the following values of the oscillation frequency:

Δ m_{s} < 1.4 {ps}^{- 1}

and

2.4 < Δ m_{s} < 5.3 {ps}^{- 1}

at the 95% confidence level.

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