Hadron physics at KLOE and KLOE-2

Laboratori Nazionali di Frascati dell'INFN, Frascati, Italy

^a e-mail: simona.giovannella@lnf.infn.it

Published online: 9 June 2014

Abstract

The KLOE experiment at the Frascati ϕ-factory collected large samples of light mesons, providing precise knowledge of their decay dynamics. The η → π⁺π⁻γ decay has been studied to search for a possible contribution from chiral anomaly, while a new preliminary high statistics Dalitz plot analysis of the η → π⁺π⁻π⁰ will increase the accuracy of the light quark mass ratio. Pseudoscalar production associated to internal conversion of the photon into a lepton pair allows the measurement of the form factor F_p(q₁² = M_ϕ², q₂² > 0) in the kinematical region of interest for the VMD model. Detailed study of such decays has been performed both for ϕ → ηe⁺e⁻ and ϕ → π⁰e⁺e⁻ processes. Moreover, data collected at √s have been used to study hadron production in γγ interactions, providing the most precise measurement of the Γ(η → γγ) partial width.