On Branching Ratio Measurements of $B_s$ Decays

Details On Branching Ratio Measurements of $B_s$ Decays On Branching Ratio Measurements of $B_s$ Decays

2012-04-08

arxiv.org/abs/1204.1735v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

6 pages, 1 figure, arXiv identifier and reference added, minor reformulation

Scientific paper

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 these effects can be included through the effective $B_s$ decay lifetime, which requires time information of the untagged data sample. We also address experimental issues in these measurements, and advocate the use of the $B_s$ branching ratios, as presented in this note, in particle listings.

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