Eur. Phys. J. C (2011) 71: 1832
https://doi.org/10.1140/epjc/s10052-011-1832-x

Regular Article - Theoretical Physics

Anatomy of

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, Naples, Italy

^* e-mail: Robert.Fleischer@nikhef.nl

Received: 26 October 2011
Published online: 9 December 2011

Abstract

The decay offers an interesting experimental alternative to the well-known channel for the search of CP-violating New-Physics contributions to – mixing. As the hadronic structure of the f ₀(980) has not yet been settled, we take a critical look at the implications for the relevant observables and address recent experimental data. It turns out that the effective lifetime of and its mixing-induced CP asymmetry S are quite robust with respect to hadronic effects and thereby allow us to search for a large CP-violating – mixing phase ϕ _s , which is tiny in the Standard Model. However, should small CP violation, i.e. in the range −0.1≲S≲0, be found in , it will be crucial to constrain hadronic corrections in order to distinguish possible New-Physics effects from the Standard Model. We point out that , which has not yet been measured, is a key channel in this respect and discuss the physics potential of this decay.