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

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

2012-03-15

arxiv.org/abs/1203.3435v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

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

Scientific paper

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.

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