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2012

Branching Ratio Measurements of $B_s$ Decays

De Bruyn, Kristof, Fleischer, Robert, Knegjens, Robert et al.

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We have just entered an era of precision measurements for $B_s$-decay observables.

A characteristic feature of the $B_s$-meson system is $B^0_s$--$\bar B^0_s$ mixing, which exhibits a sizable decay width difference.
The latter feature leads to a subtle complication for the extraction of branching ratios of $B_s$ decays from untagged data samples, leading to systematic biases as large as O(10%) that depend on the dynamics of the considered decay.
We point out that this effect can only be corrected for using information from a time-dependent analysis and suggest the use of the effective $B_s$ decay lifetime, which can already be extracted from the untagged data sample, for this purpose.

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