Exploring CP Violation and eta-etaprime mixing with the B0s,d -> Jpsi eta (prime) systems

These decays provide new terrain for exploring CP violation. After briefly discussing eta-etaprime mixing, we analyse the effective lifetimes and CP-violating observables of the Bs channels, which allow us to probe New-Physics effects in B0s-antiB0s mixing. We have a critical look at these observables and show how hadronic corrections can be controlled by means of the Bd decays. Using measurements of the branching ratios by the Belle collaboration, we discuss tests of the SU(3)F flavour symmetry of strong interactions, obtain the first constraints on the hadronic parameters entering the system, and predict the branching ratio with high accuracy. Furthermore, we present strategies for the determination of the eta-etaprime mixing parameters from these observables. We also observe that such decays are???from a formal point of view???analogous to the quark???antiquark and tetraquark descriptions of the f0(980) in the B0sd-> J/psi f0(980) channels, respectively.