2020/10/27 by Marten Z. Barel, Kristof De Bruyn, Robert Fleischer +1 · 1 voice
Physics and Astronomy · #hep-ph
paper · pdf · doi:10.1088/1361-6471/abf2a2
published as J. Phys. G: Nucl. Part. Phys. 48 (2021) 065002 · 33 pages, 13 figures, matches published version
arxiv published 2020/10/27 · arxiv created 2021/04/28 · arxiv updated 2021/04/29
The decays Bd0→ J/ψK0Sand Bs0→ J/ψϕ play a key role for the determination of the B0q- B0q (q=d,s) mixing phases ϕd and ϕs, respectively. The theoretical precision of the extraction of these quantities is limited by doubly Cabibbo-suppressed penguin topologies, which can be included through control channels by means of the SU(3) flavour symmetry of strong interactions. Using the currently available data and a new simultaneous analysis, we discuss the state-of-the-art picture of these effects and include them in the extracted ϕq values. We have a critical look at the Standard Model predictions of these phases and explore the room left for new physics. Considering future scenarios for the high-precision era of flavour physics, we illustrate that we may obtain signals for physics beyond the Standard Model with a significance well above five standard deviations. We also determine effective colour-suppression factors of Bd0→ J/ψK0, Bd0→ J/ψK0S and Bd0→ J/ψπ0 decays, which serve as benchmarks for QCD calculations of the underlying decay dynamics, and present a new method using information from semileptonic Bd0→π-ℓ+νℓ and Bs0→ K-ℓ+νℓ decays.