Branching Ratio Measurements of $B_s$ Decays

Abstract

We have just entered an era of precision measurements for $B_s$-decay observables. A characteristic feature of the $B_s$-meson system is $B_s^0$--${\bar{B}}_s^0$ 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. We also address several experimental issues that can play a role in the extraction of effective lifetimes at a hadron collider, and advocate the use of the $B_s$ branching ratios, as presented in this note, for consistent comparisons of theoretical calculations and experimental measurements in particle listings.

7 pages, 1 figure, title matches published version in Physical Review D

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• Observation of Bs->Ds(*)+Ds(*)- using e+e- collisions and a determination of the Bs-Bsbar width difference ΔΓ_s
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Cited by in corpus (20)

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• Measurement of the ratio of branching fractions BR(B0 -> K*0 gamma)/BR(Bs0 -> phi gamma) and the direct CP asymmetry in B0 -> K*0 gamma
• Supersymmetric constraints from Bs -> mu+mu- and B -> K* mu+mu- observables
• Supersymmetry confronts Bs -> mu+mu-: Present and future status
• Exploring $B_s\to D_s^{(\ast )\pm }{K}^{\mp }$ Decays in the Presence of a Sizable Width Difference $\Delta {\Gamma }_s$
• The Minimal Flavour Violation benchmark in view of the latest LHCb data
• Standard Model Predictions and New Physics Sensitivity in B->DD Decays
• Testing the Standard Model and searching for New Physics with $B_d\to \pi \pi$ and $B_s\to KK$ decays
• Measurement of the $B_s^0\to J/\psi K^{\ast 0}$ branching fraction and angular amplitudes
• Study of $\eta -{\eta }^{\prime }$ mixing from measurement of $B_{(s)}^0\to J/\psi {\eta }^{(\prime )}$~decay rates
• Search for $B_s\to {\mu }^{+}{\mu }^{-}$ and $B_d\to {\mu }^{+}{\mu }^{-}$ decays with the full CDF Run II data set
• Measurement of the $B_s^0\to J/\psi K_S^0$ branching fraction
• Observation of the $B_s^0\to J/\psi K_{\mathrm{S}}^0{K}^{\pm }{\pi }^{\mp }$ decay
• Probing New Physics with $B_s^0\to {\mu }^{+}{\mu }^{-}$: Status and Perspectives
• B-meson decay constants and mixing on the lattice
• CKM studies from b physics at hadron machines
• Search for rare purely leptonic decays at LHCb