Eur Phys J C (2004) 33: s309-s311
https://doi.org/10.1140/epjcd/s2003-03-214-x

PS02 Rare Decays

Rare φ decays

I.N.F.N. Sezione di Napoli, Dip. Scienze Fisiche, Complesso Universitario MSA, Via Cinthia Ed.G 80126 Napoli, Italy

Received: 22 October 2003
Accepted: 28 October 2003
Published online: 31 October 2003

Abstract

The Kloe experiment has collected an integrated luminosity ~ 500 pb ^–1 up to now, which means ~ 1.65×10⁹ φ decays. The huge amount of events allowed us to measure rare φ decays. We measured the radiative decays of the φ meson into π ⁰, η and η ^′(958). These measurements are relevant to assess the mixing in the pseudoscalar nonet as well as to evaluate the gluon content in the η ^′(958). Moreover also the radiative decays into π ⁰ π ⁰ γ and η π ⁰ γ have been measured. These decays are dominated by the final states f₀(980) and a ₀(980). The measurement of the branching ratios and of the π ⁰ π ⁰ or η π ⁰ invariant mass spectrum helps to understand the controversial nature of the above scalar mesons.

PACS: PACS-key e ⁺ e ^– collisions – PACS-key φ radiative decays