Regular Article - Theoretical Physics
Exploring CP violation and η–η′ mixing with the systems
Nikhef, Science Park 105, 1098 XG, Amsterdam, The Netherlands
2 Dipartimento di Scienze Fisiche, Università di Napoli Federico II and I.N.F.N., Sezione di Napoli, Complesso Universitario di Monte Sant’Angelo, Via Cintia, 80126, Napoli, Italy
* e-mail: Robert.Fleischer@niknef.nl
Published online: 18 November 2011
The decays provide new terrain for exploring CP violation. After briefly discussing η–η′ mixing, we analyse the effective lifetimes and CP-violating observables of the B s channels, which allow us to probe New-Physics effects in – mixing. We have a critical look at these observables and show how hadronic corrections can be controlled by means of the B d 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 at the 5×10−6 level. Furthermore, we present strategies for the determination of the η–η′ mixing parameters from the observables. We also observe that the and decays are—from a formal point of view—analogous to the quark–antiquark and tetraquark descriptions of the f 0(980) in the channels, respectively.
© Springer-Verlag / Società Italiana di Fisica, 2011