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\section{Analysis strategy}
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The goal of this analysis is to measure the $B_s$ lifetime, mass and width with the smallest possible amount of data for ICHEP 2010.
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We look at the decay length $c\tau$ and at the invariant mass of the reconstructed B candidates as variables for the discrimination
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between signal and background. The dominant background processes from prompt $J/ \psi$, the inclusive $b$ production and the
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residual QCD background are identified and separated from the signal through an optimized set of selection criteria to maximize the
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signal significance. After the selection of $B_s$ candidates we extract the signal yield and the lifetime with an unbinned two-dimensional
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ML fit to the invariant mass and $c\tau$ of the candidates.
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