Key points are not available for this paper at this time.
Controlling the contributions from doubly Cabibbo-suppressed penguin topologies in the decays Bd⁰ J/ K⁰ₒ and Bₛ⁰ J/ is mandatory to reach the highest possible precision in the measurement of the B⁰q- B⁰q (q=d, s) mixing phases d and ₛ. The penguin contributions can be determined using a strategy based on the SU (3) flavour symmetry of QCD. Using the latest experimental data, we update our combined analysis of the decays Bd⁰ J/ K⁰ₒ, Bₛ⁰ J/ and their control channels Bₛ⁰ J/ K⁰ₒ, Bd⁰ J/⁰ and Bd⁰ J/⁰. This allows us to simultaneously determine the penguin parameters and both mixing phases. We discuss how the branching fractions of these decays can be used to probe the size of non-factorisable SU (3) -breaking effects, which form the main theoretical uncertainty associated with our SU (3) -based strategy, and provide new insights into the factorisation approach.
Bruyn et al. (Fri,) studied this question.