Eta and eta’ physics in KLOE

¹ Istituto Nazionale di Fisica Nucleare, Frascati, Italy
² National Centre for Nuclear Research, Warsaw, Poland

Published online: 18 October 2019

Abstract

We present results obtained by the KLOE Collaboration at the DAфNE e⁺e⁻ collider located in Frascati Laboratories, Italy. The results concern precise measurements of several η meson decays such as Dalitz slope parameters and charge asymmetries for $\eta \to {{\displaystyle \pi }}^{+}{{\displaystyle \pi }}^{-}{{\displaystyle \pi }}^0$, branching ratio and plane asymmetry for $\eta \to {{\displaystyle \pi }}^{+}{{\displaystyle \pi }}^{-}{{\displaystyle \text{e}}}^{+}{{\displaystyle \text{e}}}^{-}$, and first observation of $\eta \to {{\displaystyle \text{e}}}^{+}{{\displaystyle \text{e}}}^{-}{{\displaystyle \text{e}}}^{+}{{\displaystyle \text{e}}}^{-}$ along with its branching ratio determination. Also preliminary studies of $\eta \to {{\displaystyle \pi }}^0\gamma \gamma$ decay channel are presented as well as physics perspectives for many different processes for the ongoing KLOE−2 data taking.