Measuring beta_s with Bs -> K0(*) K0bar(*) -- a Reappraisal

Abstract

The Bs-Bsbar mixing phase, beta_s, can be extracted from Bs -> K0(*) K0bar(*), but there is a theoretical error if the second amplitude, Vub* Vus P'uc, is non-negligible. Ciuchini, Pierini and Silvestrini (CPS) have suggested measuring Puc in Bd -> K0(*) K0bar(*), and relating it to P'uc using SU(3). For their choice of the direct and indirect CP asymmetries in Bd -> K0(*) K0bar(*), they find that the error on beta_s is very small, even allowing for 100% SU(3) breaking. In this paper, we re-examine the CPS method, allowing for a large range of the Bd -> K0(*) K0bar(*) observables. We find that the theoretical error in the extraction of beta_s can be quite large, up to 18 degrees. This problem can be ameliorated if the value of SU(3) breaking were known, and we discuss different ways, both experimental and theoretical, of determining this quantity.

16 pages, 5 figures, LaTeX. References added, text slightly modified, analysis and conclusions unchanged

References in corpus (5)

• Branching fractions, polarisation and asymmetries of B -> VV decays
• Measurement of $\boldmath {B_s^0}$ mixing parameters from the flavor-tagged decay
• SU(3) Breaking in Charmless B Decays
• B_s to K^(*)0 \bar K^(*)0 decays: the golden channels for new physics searches
• Measurement of Time-Dependent CP-Violating Parameters in B0 -> K0S K0S decays

Cited by in corpus (11)

• Implications of LHCb measurements and future prospects
• 50 Years of Quantum Chromodynamics
• Rare Decays and CP Violation in the $B_s$ System
• CP violation in the B system
• Flavor dependence of annihilation parameters in QCD factorization
• First measurement of the $CP$-violating phase ${\varphi }_s^{d\overline{d}}$ in $B_s^0\to (K^{+}{\pi }^{-})(K^{-}{\pi }^{+})$ decays
• Reducing Penguin Pollution
• Measurement of the branching fraction of the decay $B_s^0\to K_S^0{K}_S^0$
• Searching for the squark flavor mixing in CP violations of Bs -> K+ K- and K0bar K0 decays
• A phenomenological estimate of rescattering effects in $B_s\to K^{\ast 0}{\bar{K}}^{\ast 0}$
• Measurement of the branching fractions and longitudinal polarisations of $B_{(s)}^0\to K^{\ast 0}\overline{K}{}^{\ast 0}$ decays