https://doi.org/10.1140/epjc/s10052-011-1798-8
Regular Article - Theoretical Physics
Exploring CP violation and η–η′ mixing with the 
systems
1
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
Received:
27
October
2011
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
