Measurement of the φ meson radiative decays into scalar and pseudoscalar mesons with the KLOE detector

Abstract

Abstract The Kloe experiment has 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 ηπ 0 γ have been measured. These decays are dominated by the final states f 0 (980) and α 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.